File: | src/gnu/usr.bin/clang/libclangSema/../../../llvm/clang/lib/Sema/SemaDeclCXX.cpp |
Warning: | line 16492, column 7 Value stored to 'IsMemberSpecialization' is never read |
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1 | //===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// |
2 | // |
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
4 | // See https://llvm.org/LICENSE.txt for license information. |
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
6 | // |
7 | //===----------------------------------------------------------------------===// |
8 | // |
9 | // This file implements semantic analysis for C++ declarations. |
10 | // |
11 | //===----------------------------------------------------------------------===// |
12 | |
13 | #include "clang/AST/ASTConsumer.h" |
14 | #include "clang/AST/ASTContext.h" |
15 | #include "clang/AST/ASTLambda.h" |
16 | #include "clang/AST/ASTMutationListener.h" |
17 | #include "clang/AST/CXXInheritance.h" |
18 | #include "clang/AST/CharUnits.h" |
19 | #include "clang/AST/ComparisonCategories.h" |
20 | #include "clang/AST/EvaluatedExprVisitor.h" |
21 | #include "clang/AST/ExprCXX.h" |
22 | #include "clang/AST/RecordLayout.h" |
23 | #include "clang/AST/RecursiveASTVisitor.h" |
24 | #include "clang/AST/StmtVisitor.h" |
25 | #include "clang/AST/TypeLoc.h" |
26 | #include "clang/AST/TypeOrdering.h" |
27 | #include "clang/Basic/AttributeCommonInfo.h" |
28 | #include "clang/Basic/PartialDiagnostic.h" |
29 | #include "clang/Basic/TargetInfo.h" |
30 | #include "clang/Lex/LiteralSupport.h" |
31 | #include "clang/Lex/Preprocessor.h" |
32 | #include "clang/Sema/CXXFieldCollector.h" |
33 | #include "clang/Sema/DeclSpec.h" |
34 | #include "clang/Sema/Initialization.h" |
35 | #include "clang/Sema/Lookup.h" |
36 | #include "clang/Sema/ParsedTemplate.h" |
37 | #include "clang/Sema/Scope.h" |
38 | #include "clang/Sema/ScopeInfo.h" |
39 | #include "clang/Sema/SemaInternal.h" |
40 | #include "clang/Sema/Template.h" |
41 | #include "llvm/ADT/ScopeExit.h" |
42 | #include "llvm/ADT/SmallString.h" |
43 | #include "llvm/ADT/STLExtras.h" |
44 | #include "llvm/ADT/StringExtras.h" |
45 | #include <map> |
46 | #include <set> |
47 | |
48 | using namespace clang; |
49 | |
50 | //===----------------------------------------------------------------------===// |
51 | // CheckDefaultArgumentVisitor |
52 | //===----------------------------------------------------------------------===// |
53 | |
54 | namespace { |
55 | /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses |
56 | /// the default argument of a parameter to determine whether it |
57 | /// contains any ill-formed subexpressions. For example, this will |
58 | /// diagnose the use of local variables or parameters within the |
59 | /// default argument expression. |
60 | class CheckDefaultArgumentVisitor |
61 | : public ConstStmtVisitor<CheckDefaultArgumentVisitor, bool> { |
62 | Sema &S; |
63 | const Expr *DefaultArg; |
64 | |
65 | public: |
66 | CheckDefaultArgumentVisitor(Sema &S, const Expr *DefaultArg) |
67 | : S(S), DefaultArg(DefaultArg) {} |
68 | |
69 | bool VisitExpr(const Expr *Node); |
70 | bool VisitDeclRefExpr(const DeclRefExpr *DRE); |
71 | bool VisitCXXThisExpr(const CXXThisExpr *ThisE); |
72 | bool VisitLambdaExpr(const LambdaExpr *Lambda); |
73 | bool VisitPseudoObjectExpr(const PseudoObjectExpr *POE); |
74 | }; |
75 | |
76 | /// VisitExpr - Visit all of the children of this expression. |
77 | bool CheckDefaultArgumentVisitor::VisitExpr(const Expr *Node) { |
78 | bool IsInvalid = false; |
79 | for (const Stmt *SubStmt : Node->children()) |
80 | IsInvalid |= Visit(SubStmt); |
81 | return IsInvalid; |
82 | } |
83 | |
84 | /// VisitDeclRefExpr - Visit a reference to a declaration, to |
85 | /// determine whether this declaration can be used in the default |
86 | /// argument expression. |
87 | bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(const DeclRefExpr *DRE) { |
88 | const NamedDecl *Decl = DRE->getDecl(); |
89 | if (const auto *Param = dyn_cast<ParmVarDecl>(Decl)) { |
90 | // C++ [dcl.fct.default]p9: |
91 | // [...] parameters of a function shall not be used in default |
92 | // argument expressions, even if they are not evaluated. [...] |
93 | // |
94 | // C++17 [dcl.fct.default]p9 (by CWG 2082): |
95 | // [...] A parameter shall not appear as a potentially-evaluated |
96 | // expression in a default argument. [...] |
97 | // |
98 | if (DRE->isNonOdrUse() != NOUR_Unevaluated) |
99 | return S.Diag(DRE->getBeginLoc(), |
100 | diag::err_param_default_argument_references_param) |
101 | << Param->getDeclName() << DefaultArg->getSourceRange(); |
102 | } else if (const auto *VDecl = dyn_cast<VarDecl>(Decl)) { |
103 | // C++ [dcl.fct.default]p7: |
104 | // Local variables shall not be used in default argument |
105 | // expressions. |
106 | // |
107 | // C++17 [dcl.fct.default]p7 (by CWG 2082): |
108 | // A local variable shall not appear as a potentially-evaluated |
109 | // expression in a default argument. |
110 | // |
111 | // C++20 [dcl.fct.default]p7 (DR as part of P0588R1, see also CWG 2346): |
112 | // Note: A local variable cannot be odr-used (6.3) in a default argument. |
113 | // |
114 | if (VDecl->isLocalVarDecl() && !DRE->isNonOdrUse()) |
115 | return S.Diag(DRE->getBeginLoc(), |
116 | diag::err_param_default_argument_references_local) |
117 | << VDecl->getDeclName() << DefaultArg->getSourceRange(); |
118 | } |
119 | |
120 | return false; |
121 | } |
122 | |
123 | /// VisitCXXThisExpr - Visit a C++ "this" expression. |
124 | bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(const CXXThisExpr *ThisE) { |
125 | // C++ [dcl.fct.default]p8: |
126 | // The keyword this shall not be used in a default argument of a |
127 | // member function. |
128 | return S.Diag(ThisE->getBeginLoc(), |
129 | diag::err_param_default_argument_references_this) |
130 | << ThisE->getSourceRange(); |
131 | } |
132 | |
133 | bool CheckDefaultArgumentVisitor::VisitPseudoObjectExpr( |
134 | const PseudoObjectExpr *POE) { |
135 | bool Invalid = false; |
136 | for (const Expr *E : POE->semantics()) { |
137 | // Look through bindings. |
138 | if (const auto *OVE = dyn_cast<OpaqueValueExpr>(E)) { |
139 | E = OVE->getSourceExpr(); |
140 | assert(E && "pseudo-object binding without source expression?")((void)0); |
141 | } |
142 | |
143 | Invalid |= Visit(E); |
144 | } |
145 | return Invalid; |
146 | } |
147 | |
148 | bool CheckDefaultArgumentVisitor::VisitLambdaExpr(const LambdaExpr *Lambda) { |
149 | // C++11 [expr.lambda.prim]p13: |
150 | // A lambda-expression appearing in a default argument shall not |
151 | // implicitly or explicitly capture any entity. |
152 | if (Lambda->capture_begin() == Lambda->capture_end()) |
153 | return false; |
154 | |
155 | return S.Diag(Lambda->getBeginLoc(), diag::err_lambda_capture_default_arg); |
156 | } |
157 | } // namespace |
158 | |
159 | void |
160 | Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, |
161 | const CXXMethodDecl *Method) { |
162 | // If we have an MSAny spec already, don't bother. |
163 | if (!Method || ComputedEST == EST_MSAny) |
164 | return; |
165 | |
166 | const FunctionProtoType *Proto |
167 | = Method->getType()->getAs<FunctionProtoType>(); |
168 | Proto = Self->ResolveExceptionSpec(CallLoc, Proto); |
169 | if (!Proto) |
170 | return; |
171 | |
172 | ExceptionSpecificationType EST = Proto->getExceptionSpecType(); |
173 | |
174 | // If we have a throw-all spec at this point, ignore the function. |
175 | if (ComputedEST == EST_None) |
176 | return; |
177 | |
178 | if (EST == EST_None && Method->hasAttr<NoThrowAttr>()) |
179 | EST = EST_BasicNoexcept; |
180 | |
181 | switch (EST) { |
182 | case EST_Unparsed: |
183 | case EST_Uninstantiated: |
184 | case EST_Unevaluated: |
185 | llvm_unreachable("should not see unresolved exception specs here")__builtin_unreachable(); |
186 | |
187 | // If this function can throw any exceptions, make a note of that. |
188 | case EST_MSAny: |
189 | case EST_None: |
190 | // FIXME: Whichever we see last of MSAny and None determines our result. |
191 | // We should make a consistent, order-independent choice here. |
192 | ClearExceptions(); |
193 | ComputedEST = EST; |
194 | return; |
195 | case EST_NoexceptFalse: |
196 | ClearExceptions(); |
197 | ComputedEST = EST_None; |
198 | return; |
199 | // FIXME: If the call to this decl is using any of its default arguments, we |
200 | // need to search them for potentially-throwing calls. |
201 | // If this function has a basic noexcept, it doesn't affect the outcome. |
202 | case EST_BasicNoexcept: |
203 | case EST_NoexceptTrue: |
204 | case EST_NoThrow: |
205 | return; |
206 | // If we're still at noexcept(true) and there's a throw() callee, |
207 | // change to that specification. |
208 | case EST_DynamicNone: |
209 | if (ComputedEST == EST_BasicNoexcept) |
210 | ComputedEST = EST_DynamicNone; |
211 | return; |
212 | case EST_DependentNoexcept: |
213 | llvm_unreachable(__builtin_unreachable() |
214 | "should not generate implicit declarations for dependent cases")__builtin_unreachable(); |
215 | case EST_Dynamic: |
216 | break; |
217 | } |
218 | assert(EST == EST_Dynamic && "EST case not considered earlier.")((void)0); |
219 | assert(ComputedEST != EST_None &&((void)0) |
220 | "Shouldn't collect exceptions when throw-all is guaranteed.")((void)0); |
221 | ComputedEST = EST_Dynamic; |
222 | // Record the exceptions in this function's exception specification. |
223 | for (const auto &E : Proto->exceptions()) |
224 | if (ExceptionsSeen.insert(Self->Context.getCanonicalType(E)).second) |
225 | Exceptions.push_back(E); |
226 | } |
227 | |
228 | void Sema::ImplicitExceptionSpecification::CalledStmt(Stmt *S) { |
229 | if (!S || ComputedEST == EST_MSAny) |
230 | return; |
231 | |
232 | // FIXME: |
233 | // |
234 | // C++0x [except.spec]p14: |
235 | // [An] implicit exception-specification specifies the type-id T if and |
236 | // only if T is allowed by the exception-specification of a function directly |
237 | // invoked by f's implicit definition; f shall allow all exceptions if any |
238 | // function it directly invokes allows all exceptions, and f shall allow no |
239 | // exceptions if every function it directly invokes allows no exceptions. |
240 | // |
241 | // Note in particular that if an implicit exception-specification is generated |
242 | // for a function containing a throw-expression, that specification can still |
243 | // be noexcept(true). |
244 | // |
245 | // Note also that 'directly invoked' is not defined in the standard, and there |
246 | // is no indication that we should only consider potentially-evaluated calls. |
247 | // |
248 | // Ultimately we should implement the intent of the standard: the exception |
249 | // specification should be the set of exceptions which can be thrown by the |
250 | // implicit definition. For now, we assume that any non-nothrow expression can |
251 | // throw any exception. |
252 | |
253 | if (Self->canThrow(S)) |
254 | ComputedEST = EST_None; |
255 | } |
256 | |
257 | ExprResult Sema::ConvertParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, |
258 | SourceLocation EqualLoc) { |
259 | if (RequireCompleteType(Param->getLocation(), Param->getType(), |
260 | diag::err_typecheck_decl_incomplete_type)) |
261 | return true; |
262 | |
263 | // C++ [dcl.fct.default]p5 |
264 | // A default argument expression is implicitly converted (clause |
265 | // 4) to the parameter type. The default argument expression has |
266 | // the same semantic constraints as the initializer expression in |
267 | // a declaration of a variable of the parameter type, using the |
268 | // copy-initialization semantics (8.5). |
269 | InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, |
270 | Param); |
271 | InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), |
272 | EqualLoc); |
273 | InitializationSequence InitSeq(*this, Entity, Kind, Arg); |
274 | ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg); |
275 | if (Result.isInvalid()) |
276 | return true; |
277 | Arg = Result.getAs<Expr>(); |
278 | |
279 | CheckCompletedExpr(Arg, EqualLoc); |
280 | Arg = MaybeCreateExprWithCleanups(Arg); |
281 | |
282 | return Arg; |
283 | } |
284 | |
285 | void Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, |
286 | SourceLocation EqualLoc) { |
287 | // Add the default argument to the parameter |
288 | Param->setDefaultArg(Arg); |
289 | |
290 | // We have already instantiated this parameter; provide each of the |
291 | // instantiations with the uninstantiated default argument. |
292 | UnparsedDefaultArgInstantiationsMap::iterator InstPos |
293 | = UnparsedDefaultArgInstantiations.find(Param); |
294 | if (InstPos != UnparsedDefaultArgInstantiations.end()) { |
295 | for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) |
296 | InstPos->second[I]->setUninstantiatedDefaultArg(Arg); |
297 | |
298 | // We're done tracking this parameter's instantiations. |
299 | UnparsedDefaultArgInstantiations.erase(InstPos); |
300 | } |
301 | } |
302 | |
303 | /// ActOnParamDefaultArgument - Check whether the default argument |
304 | /// provided for a function parameter is well-formed. If so, attach it |
305 | /// to the parameter declaration. |
306 | void |
307 | Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, |
308 | Expr *DefaultArg) { |
309 | if (!param || !DefaultArg) |
310 | return; |
311 | |
312 | ParmVarDecl *Param = cast<ParmVarDecl>(param); |
313 | UnparsedDefaultArgLocs.erase(Param); |
314 | |
315 | auto Fail = [&] { |
316 | Param->setInvalidDecl(); |
317 | Param->setDefaultArg(new (Context) OpaqueValueExpr( |
318 | EqualLoc, Param->getType().getNonReferenceType(), VK_PRValue)); |
319 | }; |
320 | |
321 | // Default arguments are only permitted in C++ |
322 | if (!getLangOpts().CPlusPlus) { |
323 | Diag(EqualLoc, diag::err_param_default_argument) |
324 | << DefaultArg->getSourceRange(); |
325 | return Fail(); |
326 | } |
327 | |
328 | // Check for unexpanded parameter packs. |
329 | if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { |
330 | return Fail(); |
331 | } |
332 | |
333 | // C++11 [dcl.fct.default]p3 |
334 | // A default argument expression [...] shall not be specified for a |
335 | // parameter pack. |
336 | if (Param->isParameterPack()) { |
337 | Diag(EqualLoc, diag::err_param_default_argument_on_parameter_pack) |
338 | << DefaultArg->getSourceRange(); |
339 | // Recover by discarding the default argument. |
340 | Param->setDefaultArg(nullptr); |
341 | return; |
342 | } |
343 | |
344 | ExprResult Result = ConvertParamDefaultArgument(Param, DefaultArg, EqualLoc); |
345 | if (Result.isInvalid()) |
346 | return Fail(); |
347 | |
348 | DefaultArg = Result.getAs<Expr>(); |
349 | |
350 | // Check that the default argument is well-formed |
351 | CheckDefaultArgumentVisitor DefaultArgChecker(*this, DefaultArg); |
352 | if (DefaultArgChecker.Visit(DefaultArg)) |
353 | return Fail(); |
354 | |
355 | SetParamDefaultArgument(Param, DefaultArg, EqualLoc); |
356 | } |
357 | |
358 | /// ActOnParamUnparsedDefaultArgument - We've seen a default |
359 | /// argument for a function parameter, but we can't parse it yet |
360 | /// because we're inside a class definition. Note that this default |
361 | /// argument will be parsed later. |
362 | void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, |
363 | SourceLocation EqualLoc, |
364 | SourceLocation ArgLoc) { |
365 | if (!param) |
366 | return; |
367 | |
368 | ParmVarDecl *Param = cast<ParmVarDecl>(param); |
369 | Param->setUnparsedDefaultArg(); |
370 | UnparsedDefaultArgLocs[Param] = ArgLoc; |
371 | } |
372 | |
373 | /// ActOnParamDefaultArgumentError - Parsing or semantic analysis of |
374 | /// the default argument for the parameter param failed. |
375 | void Sema::ActOnParamDefaultArgumentError(Decl *param, |
376 | SourceLocation EqualLoc) { |
377 | if (!param) |
378 | return; |
379 | |
380 | ParmVarDecl *Param = cast<ParmVarDecl>(param); |
381 | Param->setInvalidDecl(); |
382 | UnparsedDefaultArgLocs.erase(Param); |
383 | Param->setDefaultArg(new (Context) OpaqueValueExpr( |
384 | EqualLoc, Param->getType().getNonReferenceType(), VK_PRValue)); |
385 | } |
386 | |
387 | /// CheckExtraCXXDefaultArguments - Check for any extra default |
388 | /// arguments in the declarator, which is not a function declaration |
389 | /// or definition and therefore is not permitted to have default |
390 | /// arguments. This routine should be invoked for every declarator |
391 | /// that is not a function declaration or definition. |
392 | void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { |
393 | // C++ [dcl.fct.default]p3 |
394 | // A default argument expression shall be specified only in the |
395 | // parameter-declaration-clause of a function declaration or in a |
396 | // template-parameter (14.1). It shall not be specified for a |
397 | // parameter pack. If it is specified in a |
398 | // parameter-declaration-clause, it shall not occur within a |
399 | // declarator or abstract-declarator of a parameter-declaration. |
400 | bool MightBeFunction = D.isFunctionDeclarationContext(); |
401 | for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { |
402 | DeclaratorChunk &chunk = D.getTypeObject(i); |
403 | if (chunk.Kind == DeclaratorChunk::Function) { |
404 | if (MightBeFunction) { |
405 | // This is a function declaration. It can have default arguments, but |
406 | // keep looking in case its return type is a function type with default |
407 | // arguments. |
408 | MightBeFunction = false; |
409 | continue; |
410 | } |
411 | for (unsigned argIdx = 0, e = chunk.Fun.NumParams; argIdx != e; |
412 | ++argIdx) { |
413 | ParmVarDecl *Param = cast<ParmVarDecl>(chunk.Fun.Params[argIdx].Param); |
414 | if (Param->hasUnparsedDefaultArg()) { |
415 | std::unique_ptr<CachedTokens> Toks = |
416 | std::move(chunk.Fun.Params[argIdx].DefaultArgTokens); |
417 | SourceRange SR; |
418 | if (Toks->size() > 1) |
419 | SR = SourceRange((*Toks)[1].getLocation(), |
420 | Toks->back().getLocation()); |
421 | else |
422 | SR = UnparsedDefaultArgLocs[Param]; |
423 | Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) |
424 | << SR; |
425 | } else if (Param->getDefaultArg()) { |
426 | Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) |
427 | << Param->getDefaultArg()->getSourceRange(); |
428 | Param->setDefaultArg(nullptr); |
429 | } |
430 | } |
431 | } else if (chunk.Kind != DeclaratorChunk::Paren) { |
432 | MightBeFunction = false; |
433 | } |
434 | } |
435 | } |
436 | |
437 | static bool functionDeclHasDefaultArgument(const FunctionDecl *FD) { |
438 | return std::any_of(FD->param_begin(), FD->param_end(), [](ParmVarDecl *P) { |
439 | return P->hasDefaultArg() && !P->hasInheritedDefaultArg(); |
440 | }); |
441 | } |
442 | |
443 | /// MergeCXXFunctionDecl - Merge two declarations of the same C++ |
444 | /// function, once we already know that they have the same |
445 | /// type. Subroutine of MergeFunctionDecl. Returns true if there was an |
446 | /// error, false otherwise. |
447 | bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, |
448 | Scope *S) { |
449 | bool Invalid = false; |
450 | |
451 | // The declaration context corresponding to the scope is the semantic |
452 | // parent, unless this is a local function declaration, in which case |
453 | // it is that surrounding function. |
454 | DeclContext *ScopeDC = New->isLocalExternDecl() |
455 | ? New->getLexicalDeclContext() |
456 | : New->getDeclContext(); |
457 | |
458 | // Find the previous declaration for the purpose of default arguments. |
459 | FunctionDecl *PrevForDefaultArgs = Old; |
460 | for (/**/; PrevForDefaultArgs; |
461 | // Don't bother looking back past the latest decl if this is a local |
462 | // extern declaration; nothing else could work. |
463 | PrevForDefaultArgs = New->isLocalExternDecl() |
464 | ? nullptr |
465 | : PrevForDefaultArgs->getPreviousDecl()) { |
466 | // Ignore hidden declarations. |
467 | if (!LookupResult::isVisible(*this, PrevForDefaultArgs)) |
468 | continue; |
469 | |
470 | if (S && !isDeclInScope(PrevForDefaultArgs, ScopeDC, S) && |
471 | !New->isCXXClassMember()) { |
472 | // Ignore default arguments of old decl if they are not in |
473 | // the same scope and this is not an out-of-line definition of |
474 | // a member function. |
475 | continue; |
476 | } |
477 | |
478 | if (PrevForDefaultArgs->isLocalExternDecl() != New->isLocalExternDecl()) { |
479 | // If only one of these is a local function declaration, then they are |
480 | // declared in different scopes, even though isDeclInScope may think |
481 | // they're in the same scope. (If both are local, the scope check is |
482 | // sufficient, and if neither is local, then they are in the same scope.) |
483 | continue; |
484 | } |
485 | |
486 | // We found the right previous declaration. |
487 | break; |
488 | } |
489 | |
490 | // C++ [dcl.fct.default]p4: |
491 | // For non-template functions, default arguments can be added in |
492 | // later declarations of a function in the same |
493 | // scope. Declarations in different scopes have completely |
494 | // distinct sets of default arguments. That is, declarations in |
495 | // inner scopes do not acquire default arguments from |
496 | // declarations in outer scopes, and vice versa. In a given |
497 | // function declaration, all parameters subsequent to a |
498 | // parameter with a default argument shall have default |
499 | // arguments supplied in this or previous declarations. A |
500 | // default argument shall not be redefined by a later |
501 | // declaration (not even to the same value). |
502 | // |
503 | // C++ [dcl.fct.default]p6: |
504 | // Except for member functions of class templates, the default arguments |
505 | // in a member function definition that appears outside of the class |
506 | // definition are added to the set of default arguments provided by the |
507 | // member function declaration in the class definition. |
508 | for (unsigned p = 0, NumParams = PrevForDefaultArgs |
509 | ? PrevForDefaultArgs->getNumParams() |
510 | : 0; |
511 | p < NumParams; ++p) { |
512 | ParmVarDecl *OldParam = PrevForDefaultArgs->getParamDecl(p); |
513 | ParmVarDecl *NewParam = New->getParamDecl(p); |
514 | |
515 | bool OldParamHasDfl = OldParam ? OldParam->hasDefaultArg() : false; |
516 | bool NewParamHasDfl = NewParam->hasDefaultArg(); |
517 | |
518 | if (OldParamHasDfl && NewParamHasDfl) { |
519 | unsigned DiagDefaultParamID = |
520 | diag::err_param_default_argument_redefinition; |
521 | |
522 | // MSVC accepts that default parameters be redefined for member functions |
523 | // of template class. The new default parameter's value is ignored. |
524 | Invalid = true; |
525 | if (getLangOpts().MicrosoftExt) { |
526 | CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(New); |
527 | if (MD && MD->getParent()->getDescribedClassTemplate()) { |
528 | // Merge the old default argument into the new parameter. |
529 | NewParam->setHasInheritedDefaultArg(); |
530 | if (OldParam->hasUninstantiatedDefaultArg()) |
531 | NewParam->setUninstantiatedDefaultArg( |
532 | OldParam->getUninstantiatedDefaultArg()); |
533 | else |
534 | NewParam->setDefaultArg(OldParam->getInit()); |
535 | DiagDefaultParamID = diag::ext_param_default_argument_redefinition; |
536 | Invalid = false; |
537 | } |
538 | } |
539 | |
540 | // FIXME: If we knew where the '=' was, we could easily provide a fix-it |
541 | // hint here. Alternatively, we could walk the type-source information |
542 | // for NewParam to find the last source location in the type... but it |
543 | // isn't worth the effort right now. This is the kind of test case that |
544 | // is hard to get right: |
545 | // int f(int); |
546 | // void g(int (*fp)(int) = f); |
547 | // void g(int (*fp)(int) = &f); |
548 | Diag(NewParam->getLocation(), DiagDefaultParamID) |
549 | << NewParam->getDefaultArgRange(); |
550 | |
551 | // Look for the function declaration where the default argument was |
552 | // actually written, which may be a declaration prior to Old. |
553 | for (auto Older = PrevForDefaultArgs; |
554 | OldParam->hasInheritedDefaultArg(); /**/) { |
555 | Older = Older->getPreviousDecl(); |
556 | OldParam = Older->getParamDecl(p); |
557 | } |
558 | |
559 | Diag(OldParam->getLocation(), diag::note_previous_definition) |
560 | << OldParam->getDefaultArgRange(); |
561 | } else if (OldParamHasDfl) { |
562 | // Merge the old default argument into the new parameter unless the new |
563 | // function is a friend declaration in a template class. In the latter |
564 | // case the default arguments will be inherited when the friend |
565 | // declaration will be instantiated. |
566 | if (New->getFriendObjectKind() == Decl::FOK_None || |
567 | !New->getLexicalDeclContext()->isDependentContext()) { |
568 | // It's important to use getInit() here; getDefaultArg() |
569 | // strips off any top-level ExprWithCleanups. |
570 | NewParam->setHasInheritedDefaultArg(); |
571 | if (OldParam->hasUnparsedDefaultArg()) |
572 | NewParam->setUnparsedDefaultArg(); |
573 | else if (OldParam->hasUninstantiatedDefaultArg()) |
574 | NewParam->setUninstantiatedDefaultArg( |
575 | OldParam->getUninstantiatedDefaultArg()); |
576 | else |
577 | NewParam->setDefaultArg(OldParam->getInit()); |
578 | } |
579 | } else if (NewParamHasDfl) { |
580 | if (New->getDescribedFunctionTemplate()) { |
581 | // Paragraph 4, quoted above, only applies to non-template functions. |
582 | Diag(NewParam->getLocation(), |
583 | diag::err_param_default_argument_template_redecl) |
584 | << NewParam->getDefaultArgRange(); |
585 | Diag(PrevForDefaultArgs->getLocation(), |
586 | diag::note_template_prev_declaration) |
587 | << false; |
588 | } else if (New->getTemplateSpecializationKind() |
589 | != TSK_ImplicitInstantiation && |
590 | New->getTemplateSpecializationKind() != TSK_Undeclared) { |
591 | // C++ [temp.expr.spec]p21: |
592 | // Default function arguments shall not be specified in a declaration |
593 | // or a definition for one of the following explicit specializations: |
594 | // - the explicit specialization of a function template; |
595 | // - the explicit specialization of a member function template; |
596 | // - the explicit specialization of a member function of a class |
597 | // template where the class template specialization to which the |
598 | // member function specialization belongs is implicitly |
599 | // instantiated. |
600 | Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) |
601 | << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) |
602 | << New->getDeclName() |
603 | << NewParam->getDefaultArgRange(); |
604 | } else if (New->getDeclContext()->isDependentContext()) { |
605 | // C++ [dcl.fct.default]p6 (DR217): |
606 | // Default arguments for a member function of a class template shall |
607 | // be specified on the initial declaration of the member function |
608 | // within the class template. |
609 | // |
610 | // Reading the tea leaves a bit in DR217 and its reference to DR205 |
611 | // leads me to the conclusion that one cannot add default function |
612 | // arguments for an out-of-line definition of a member function of a |
613 | // dependent type. |
614 | int WhichKind = 2; |
615 | if (CXXRecordDecl *Record |
616 | = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { |
617 | if (Record->getDescribedClassTemplate()) |
618 | WhichKind = 0; |
619 | else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) |
620 | WhichKind = 1; |
621 | else |
622 | WhichKind = 2; |
623 | } |
624 | |
625 | Diag(NewParam->getLocation(), |
626 | diag::err_param_default_argument_member_template_redecl) |
627 | << WhichKind |
628 | << NewParam->getDefaultArgRange(); |
629 | } |
630 | } |
631 | } |
632 | |
633 | // DR1344: If a default argument is added outside a class definition and that |
634 | // default argument makes the function a special member function, the program |
635 | // is ill-formed. This can only happen for constructors. |
636 | if (isa<CXXConstructorDecl>(New) && |
637 | New->getMinRequiredArguments() < Old->getMinRequiredArguments()) { |
638 | CXXSpecialMember NewSM = getSpecialMember(cast<CXXMethodDecl>(New)), |
639 | OldSM = getSpecialMember(cast<CXXMethodDecl>(Old)); |
640 | if (NewSM != OldSM) { |
641 | ParmVarDecl *NewParam = New->getParamDecl(New->getMinRequiredArguments()); |
642 | assert(NewParam->hasDefaultArg())((void)0); |
643 | Diag(NewParam->getLocation(), diag::err_default_arg_makes_ctor_special) |
644 | << NewParam->getDefaultArgRange() << NewSM; |
645 | Diag(Old->getLocation(), diag::note_previous_declaration); |
646 | } |
647 | } |
648 | |
649 | const FunctionDecl *Def; |
650 | // C++11 [dcl.constexpr]p1: If any declaration of a function or function |
651 | // template has a constexpr specifier then all its declarations shall |
652 | // contain the constexpr specifier. |
653 | if (New->getConstexprKind() != Old->getConstexprKind()) { |
654 | Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) |
655 | << New << static_cast<int>(New->getConstexprKind()) |
656 | << static_cast<int>(Old->getConstexprKind()); |
657 | Diag(Old->getLocation(), diag::note_previous_declaration); |
658 | Invalid = true; |
659 | } else if (!Old->getMostRecentDecl()->isInlined() && New->isInlined() && |
660 | Old->isDefined(Def) && |
661 | // If a friend function is inlined but does not have 'inline' |
662 | // specifier, it is a definition. Do not report attribute conflict |
663 | // in this case, redefinition will be diagnosed later. |
664 | (New->isInlineSpecified() || |
665 | New->getFriendObjectKind() == Decl::FOK_None)) { |
666 | // C++11 [dcl.fcn.spec]p4: |
667 | // If the definition of a function appears in a translation unit before its |
668 | // first declaration as inline, the program is ill-formed. |
669 | Diag(New->getLocation(), diag::err_inline_decl_follows_def) << New; |
670 | Diag(Def->getLocation(), diag::note_previous_definition); |
671 | Invalid = true; |
672 | } |
673 | |
674 | // C++17 [temp.deduct.guide]p3: |
675 | // Two deduction guide declarations in the same translation unit |
676 | // for the same class template shall not have equivalent |
677 | // parameter-declaration-clauses. |
678 | if (isa<CXXDeductionGuideDecl>(New) && |
679 | !New->isFunctionTemplateSpecialization() && isVisible(Old)) { |
680 | Diag(New->getLocation(), diag::err_deduction_guide_redeclared); |
681 | Diag(Old->getLocation(), diag::note_previous_declaration); |
682 | } |
683 | |
684 | // C++11 [dcl.fct.default]p4: If a friend declaration specifies a default |
685 | // argument expression, that declaration shall be a definition and shall be |
686 | // the only declaration of the function or function template in the |
687 | // translation unit. |
688 | if (Old->getFriendObjectKind() == Decl::FOK_Undeclared && |
689 | functionDeclHasDefaultArgument(Old)) { |
690 | Diag(New->getLocation(), diag::err_friend_decl_with_def_arg_redeclared); |
691 | Diag(Old->getLocation(), diag::note_previous_declaration); |
692 | Invalid = true; |
693 | } |
694 | |
695 | // C++11 [temp.friend]p4 (DR329): |
696 | // When a function is defined in a friend function declaration in a class |
697 | // template, the function is instantiated when the function is odr-used. |
698 | // The same restrictions on multiple declarations and definitions that |
699 | // apply to non-template function declarations and definitions also apply |
700 | // to these implicit definitions. |
701 | const FunctionDecl *OldDefinition = nullptr; |
702 | if (New->isThisDeclarationInstantiatedFromAFriendDefinition() && |
703 | Old->isDefined(OldDefinition, true)) |
704 | CheckForFunctionRedefinition(New, OldDefinition); |
705 | |
706 | return Invalid; |
707 | } |
708 | |
709 | NamedDecl * |
710 | Sema::ActOnDecompositionDeclarator(Scope *S, Declarator &D, |
711 | MultiTemplateParamsArg TemplateParamLists) { |
712 | assert(D.isDecompositionDeclarator())((void)0); |
713 | const DecompositionDeclarator &Decomp = D.getDecompositionDeclarator(); |
714 | |
715 | // The syntax only allows a decomposition declarator as a simple-declaration, |
716 | // a for-range-declaration, or a condition in Clang, but we parse it in more |
717 | // cases than that. |
718 | if (!D.mayHaveDecompositionDeclarator()) { |
719 | Diag(Decomp.getLSquareLoc(), diag::err_decomp_decl_context) |
720 | << Decomp.getSourceRange(); |
721 | return nullptr; |
722 | } |
723 | |
724 | if (!TemplateParamLists.empty()) { |
725 | // FIXME: There's no rule against this, but there are also no rules that |
726 | // would actually make it usable, so we reject it for now. |
727 | Diag(TemplateParamLists.front()->getTemplateLoc(), |
728 | diag::err_decomp_decl_template); |
729 | return nullptr; |
730 | } |
731 | |
732 | Diag(Decomp.getLSquareLoc(), |
733 | !getLangOpts().CPlusPlus17 |
734 | ? diag::ext_decomp_decl |
735 | : D.getContext() == DeclaratorContext::Condition |
736 | ? diag::ext_decomp_decl_cond |
737 | : diag::warn_cxx14_compat_decomp_decl) |
738 | << Decomp.getSourceRange(); |
739 | |
740 | // The semantic context is always just the current context. |
741 | DeclContext *const DC = CurContext; |
742 | |
743 | // C++17 [dcl.dcl]/8: |
744 | // The decl-specifier-seq shall contain only the type-specifier auto |
745 | // and cv-qualifiers. |
746 | // C++2a [dcl.dcl]/8: |
747 | // If decl-specifier-seq contains any decl-specifier other than static, |
748 | // thread_local, auto, or cv-qualifiers, the program is ill-formed. |
749 | auto &DS = D.getDeclSpec(); |
750 | { |
751 | SmallVector<StringRef, 8> BadSpecifiers; |
752 | SmallVector<SourceLocation, 8> BadSpecifierLocs; |
753 | SmallVector<StringRef, 8> CPlusPlus20Specifiers; |
754 | SmallVector<SourceLocation, 8> CPlusPlus20SpecifierLocs; |
755 | if (auto SCS = DS.getStorageClassSpec()) { |
756 | if (SCS == DeclSpec::SCS_static) { |
757 | CPlusPlus20Specifiers.push_back(DeclSpec::getSpecifierName(SCS)); |
758 | CPlusPlus20SpecifierLocs.push_back(DS.getStorageClassSpecLoc()); |
759 | } else { |
760 | BadSpecifiers.push_back(DeclSpec::getSpecifierName(SCS)); |
761 | BadSpecifierLocs.push_back(DS.getStorageClassSpecLoc()); |
762 | } |
763 | } |
764 | if (auto TSCS = DS.getThreadStorageClassSpec()) { |
765 | CPlusPlus20Specifiers.push_back(DeclSpec::getSpecifierName(TSCS)); |
766 | CPlusPlus20SpecifierLocs.push_back(DS.getThreadStorageClassSpecLoc()); |
767 | } |
768 | if (DS.hasConstexprSpecifier()) { |
769 | BadSpecifiers.push_back( |
770 | DeclSpec::getSpecifierName(DS.getConstexprSpecifier())); |
771 | BadSpecifierLocs.push_back(DS.getConstexprSpecLoc()); |
772 | } |
773 | if (DS.isInlineSpecified()) { |
774 | BadSpecifiers.push_back("inline"); |
775 | BadSpecifierLocs.push_back(DS.getInlineSpecLoc()); |
776 | } |
777 | if (!BadSpecifiers.empty()) { |
778 | auto &&Err = Diag(BadSpecifierLocs.front(), diag::err_decomp_decl_spec); |
779 | Err << (int)BadSpecifiers.size() |
780 | << llvm::join(BadSpecifiers.begin(), BadSpecifiers.end(), " "); |
781 | // Don't add FixItHints to remove the specifiers; we do still respect |
782 | // them when building the underlying variable. |
783 | for (auto Loc : BadSpecifierLocs) |
784 | Err << SourceRange(Loc, Loc); |
785 | } else if (!CPlusPlus20Specifiers.empty()) { |
786 | auto &&Warn = Diag(CPlusPlus20SpecifierLocs.front(), |
787 | getLangOpts().CPlusPlus20 |
788 | ? diag::warn_cxx17_compat_decomp_decl_spec |
789 | : diag::ext_decomp_decl_spec); |
790 | Warn << (int)CPlusPlus20Specifiers.size() |
791 | << llvm::join(CPlusPlus20Specifiers.begin(), |
792 | CPlusPlus20Specifiers.end(), " "); |
793 | for (auto Loc : CPlusPlus20SpecifierLocs) |
794 | Warn << SourceRange(Loc, Loc); |
795 | } |
796 | // We can't recover from it being declared as a typedef. |
797 | if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) |
798 | return nullptr; |
799 | } |
800 | |
801 | // C++2a [dcl.struct.bind]p1: |
802 | // A cv that includes volatile is deprecated |
803 | if ((DS.getTypeQualifiers() & DeclSpec::TQ_volatile) && |
804 | getLangOpts().CPlusPlus20) |
805 | Diag(DS.getVolatileSpecLoc(), |
806 | diag::warn_deprecated_volatile_structured_binding); |
807 | |
808 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); |
809 | QualType R = TInfo->getType(); |
810 | |
811 | if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, |
812 | UPPC_DeclarationType)) |
813 | D.setInvalidType(); |
814 | |
815 | // The syntax only allows a single ref-qualifier prior to the decomposition |
816 | // declarator. No other declarator chunks are permitted. Also check the type |
817 | // specifier here. |
818 | if (DS.getTypeSpecType() != DeclSpec::TST_auto || |
819 | D.hasGroupingParens() || D.getNumTypeObjects() > 1 || |
820 | (D.getNumTypeObjects() == 1 && |
821 | D.getTypeObject(0).Kind != DeclaratorChunk::Reference)) { |
822 | Diag(Decomp.getLSquareLoc(), |
823 | (D.hasGroupingParens() || |
824 | (D.getNumTypeObjects() && |
825 | D.getTypeObject(0).Kind == DeclaratorChunk::Paren)) |
826 | ? diag::err_decomp_decl_parens |
827 | : diag::err_decomp_decl_type) |
828 | << R; |
829 | |
830 | // In most cases, there's no actual problem with an explicitly-specified |
831 | // type, but a function type won't work here, and ActOnVariableDeclarator |
832 | // shouldn't be called for such a type. |
833 | if (R->isFunctionType()) |
834 | D.setInvalidType(); |
835 | } |
836 | |
837 | // Build the BindingDecls. |
838 | SmallVector<BindingDecl*, 8> Bindings; |
839 | |
840 | // Build the BindingDecls. |
841 | for (auto &B : D.getDecompositionDeclarator().bindings()) { |
842 | // Check for name conflicts. |
843 | DeclarationNameInfo NameInfo(B.Name, B.NameLoc); |
844 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName, |
845 | ForVisibleRedeclaration); |
846 | LookupName(Previous, S, |
847 | /*CreateBuiltins*/DC->getRedeclContext()->isTranslationUnit()); |
848 | |
849 | // It's not permitted to shadow a template parameter name. |
850 | if (Previous.isSingleResult() && |
851 | Previous.getFoundDecl()->isTemplateParameter()) { |
852 | DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), |
853 | Previous.getFoundDecl()); |
854 | Previous.clear(); |
855 | } |
856 | |
857 | auto *BD = BindingDecl::Create(Context, DC, B.NameLoc, B.Name); |
858 | |
859 | // Find the shadowed declaration before filtering for scope. |
860 | NamedDecl *ShadowedDecl = D.getCXXScopeSpec().isEmpty() |
861 | ? getShadowedDeclaration(BD, Previous) |
862 | : nullptr; |
863 | |
864 | bool ConsiderLinkage = DC->isFunctionOrMethod() && |
865 | DS.getStorageClassSpec() == DeclSpec::SCS_extern; |
866 | FilterLookupForScope(Previous, DC, S, ConsiderLinkage, |
867 | /*AllowInlineNamespace*/false); |
868 | |
869 | if (!Previous.empty()) { |
870 | auto *Old = Previous.getRepresentativeDecl(); |
871 | Diag(B.NameLoc, diag::err_redefinition) << B.Name; |
872 | Diag(Old->getLocation(), diag::note_previous_definition); |
873 | } else if (ShadowedDecl && !D.isRedeclaration()) { |
874 | CheckShadow(BD, ShadowedDecl, Previous); |
875 | } |
876 | PushOnScopeChains(BD, S, true); |
877 | Bindings.push_back(BD); |
878 | ParsingInitForAutoVars.insert(BD); |
879 | } |
880 | |
881 | // There are no prior lookup results for the variable itself, because it |
882 | // is unnamed. |
883 | DeclarationNameInfo NameInfo((IdentifierInfo *)nullptr, |
884 | Decomp.getLSquareLoc()); |
885 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName, |
886 | ForVisibleRedeclaration); |
887 | |
888 | // Build the variable that holds the non-decomposed object. |
889 | bool AddToScope = true; |
890 | NamedDecl *New = |
891 | ActOnVariableDeclarator(S, D, DC, TInfo, Previous, |
892 | MultiTemplateParamsArg(), AddToScope, Bindings); |
893 | if (AddToScope) { |
894 | S->AddDecl(New); |
895 | CurContext->addHiddenDecl(New); |
896 | } |
897 | |
898 | if (isInOpenMPDeclareTargetContext()) |
899 | checkDeclIsAllowedInOpenMPTarget(nullptr, New); |
900 | |
901 | return New; |
902 | } |
903 | |
904 | static bool checkSimpleDecomposition( |
905 | Sema &S, ArrayRef<BindingDecl *> Bindings, ValueDecl *Src, |
906 | QualType DecompType, const llvm::APSInt &NumElems, QualType ElemType, |
907 | llvm::function_ref<ExprResult(SourceLocation, Expr *, unsigned)> GetInit) { |
908 | if ((int64_t)Bindings.size() != NumElems) { |
909 | S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings) |
910 | << DecompType << (unsigned)Bindings.size() |
911 | << (unsigned)NumElems.getLimitedValue(UINT_MAX(2147483647 *2U +1U)) |
912 | << toString(NumElems, 10) << (NumElems < Bindings.size()); |
913 | return true; |
914 | } |
915 | |
916 | unsigned I = 0; |
917 | for (auto *B : Bindings) { |
918 | SourceLocation Loc = B->getLocation(); |
919 | ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc); |
920 | if (E.isInvalid()) |
921 | return true; |
922 | E = GetInit(Loc, E.get(), I++); |
923 | if (E.isInvalid()) |
924 | return true; |
925 | B->setBinding(ElemType, E.get()); |
926 | } |
927 | |
928 | return false; |
929 | } |
930 | |
931 | static bool checkArrayLikeDecomposition(Sema &S, |
932 | ArrayRef<BindingDecl *> Bindings, |
933 | ValueDecl *Src, QualType DecompType, |
934 | const llvm::APSInt &NumElems, |
935 | QualType ElemType) { |
936 | return checkSimpleDecomposition( |
937 | S, Bindings, Src, DecompType, NumElems, ElemType, |
938 | [&](SourceLocation Loc, Expr *Base, unsigned I) -> ExprResult { |
939 | ExprResult E = S.ActOnIntegerConstant(Loc, I); |
940 | if (E.isInvalid()) |
941 | return ExprError(); |
942 | return S.CreateBuiltinArraySubscriptExpr(Base, Loc, E.get(), Loc); |
943 | }); |
944 | } |
945 | |
946 | static bool checkArrayDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings, |
947 | ValueDecl *Src, QualType DecompType, |
948 | const ConstantArrayType *CAT) { |
949 | return checkArrayLikeDecomposition(S, Bindings, Src, DecompType, |
950 | llvm::APSInt(CAT->getSize()), |
951 | CAT->getElementType()); |
952 | } |
953 | |
954 | static bool checkVectorDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings, |
955 | ValueDecl *Src, QualType DecompType, |
956 | const VectorType *VT) { |
957 | return checkArrayLikeDecomposition( |
958 | S, Bindings, Src, DecompType, llvm::APSInt::get(VT->getNumElements()), |
959 | S.Context.getQualifiedType(VT->getElementType(), |
960 | DecompType.getQualifiers())); |
961 | } |
962 | |
963 | static bool checkComplexDecomposition(Sema &S, |
964 | ArrayRef<BindingDecl *> Bindings, |
965 | ValueDecl *Src, QualType DecompType, |
966 | const ComplexType *CT) { |
967 | return checkSimpleDecomposition( |
968 | S, Bindings, Src, DecompType, llvm::APSInt::get(2), |
969 | S.Context.getQualifiedType(CT->getElementType(), |
970 | DecompType.getQualifiers()), |
971 | [&](SourceLocation Loc, Expr *Base, unsigned I) -> ExprResult { |
972 | return S.CreateBuiltinUnaryOp(Loc, I ? UO_Imag : UO_Real, Base); |
973 | }); |
974 | } |
975 | |
976 | static std::string printTemplateArgs(const PrintingPolicy &PrintingPolicy, |
977 | TemplateArgumentListInfo &Args, |
978 | const TemplateParameterList *Params) { |
979 | SmallString<128> SS; |
980 | llvm::raw_svector_ostream OS(SS); |
981 | bool First = true; |
982 | unsigned I = 0; |
983 | for (auto &Arg : Args.arguments()) { |
984 | if (!First) |
985 | OS << ", "; |
986 | Arg.getArgument().print( |
987 | PrintingPolicy, OS, |
988 | TemplateParameterList::shouldIncludeTypeForArgument(Params, I)); |
989 | First = false; |
990 | I++; |
991 | } |
992 | return std::string(OS.str()); |
993 | } |
994 | |
995 | static bool lookupStdTypeTraitMember(Sema &S, LookupResult &TraitMemberLookup, |
996 | SourceLocation Loc, StringRef Trait, |
997 | TemplateArgumentListInfo &Args, |
998 | unsigned DiagID) { |
999 | auto DiagnoseMissing = [&] { |
1000 | if (DiagID) |
1001 | S.Diag(Loc, DiagID) << printTemplateArgs(S.Context.getPrintingPolicy(), |
1002 | Args, /*Params*/ nullptr); |
1003 | return true; |
1004 | }; |
1005 | |
1006 | // FIXME: Factor out duplication with lookupPromiseType in SemaCoroutine. |
1007 | NamespaceDecl *Std = S.getStdNamespace(); |
1008 | if (!Std) |
1009 | return DiagnoseMissing(); |
1010 | |
1011 | // Look up the trait itself, within namespace std. We can diagnose various |
1012 | // problems with this lookup even if we've been asked to not diagnose a |
1013 | // missing specialization, because this can only fail if the user has been |
1014 | // declaring their own names in namespace std or we don't support the |
1015 | // standard library implementation in use. |
1016 | LookupResult Result(S, &S.PP.getIdentifierTable().get(Trait), |
1017 | Loc, Sema::LookupOrdinaryName); |
1018 | if (!S.LookupQualifiedName(Result, Std)) |
1019 | return DiagnoseMissing(); |
1020 | if (Result.isAmbiguous()) |
1021 | return true; |
1022 | |
1023 | ClassTemplateDecl *TraitTD = Result.getAsSingle<ClassTemplateDecl>(); |
1024 | if (!TraitTD) { |
1025 | Result.suppressDiagnostics(); |
1026 | NamedDecl *Found = *Result.begin(); |
1027 | S.Diag(Loc, diag::err_std_type_trait_not_class_template) << Trait; |
1028 | S.Diag(Found->getLocation(), diag::note_declared_at); |
1029 | return true; |
1030 | } |
1031 | |
1032 | // Build the template-id. |
1033 | QualType TraitTy = S.CheckTemplateIdType(TemplateName(TraitTD), Loc, Args); |
1034 | if (TraitTy.isNull()) |
1035 | return true; |
1036 | if (!S.isCompleteType(Loc, TraitTy)) { |
1037 | if (DiagID) |
1038 | S.RequireCompleteType( |
1039 | Loc, TraitTy, DiagID, |
1040 | printTemplateArgs(S.Context.getPrintingPolicy(), Args, |
1041 | TraitTD->getTemplateParameters())); |
1042 | return true; |
1043 | } |
1044 | |
1045 | CXXRecordDecl *RD = TraitTy->getAsCXXRecordDecl(); |
1046 | assert(RD && "specialization of class template is not a class?")((void)0); |
1047 | |
1048 | // Look up the member of the trait type. |
1049 | S.LookupQualifiedName(TraitMemberLookup, RD); |
1050 | return TraitMemberLookup.isAmbiguous(); |
1051 | } |
1052 | |
1053 | static TemplateArgumentLoc |
1054 | getTrivialIntegralTemplateArgument(Sema &S, SourceLocation Loc, QualType T, |
1055 | uint64_t I) { |
1056 | TemplateArgument Arg(S.Context, S.Context.MakeIntValue(I, T), T); |
1057 | return S.getTrivialTemplateArgumentLoc(Arg, T, Loc); |
1058 | } |
1059 | |
1060 | static TemplateArgumentLoc |
1061 | getTrivialTypeTemplateArgument(Sema &S, SourceLocation Loc, QualType T) { |
1062 | return S.getTrivialTemplateArgumentLoc(TemplateArgument(T), QualType(), Loc); |
1063 | } |
1064 | |
1065 | namespace { enum class IsTupleLike { TupleLike, NotTupleLike, Error }; } |
1066 | |
1067 | static IsTupleLike isTupleLike(Sema &S, SourceLocation Loc, QualType T, |
1068 | llvm::APSInt &Size) { |
1069 | EnterExpressionEvaluationContext ContextRAII( |
1070 | S, Sema::ExpressionEvaluationContext::ConstantEvaluated); |
1071 | |
1072 | DeclarationName Value = S.PP.getIdentifierInfo("value"); |
1073 | LookupResult R(S, Value, Loc, Sema::LookupOrdinaryName); |
1074 | |
1075 | // Form template argument list for tuple_size<T>. |
1076 | TemplateArgumentListInfo Args(Loc, Loc); |
1077 | Args.addArgument(getTrivialTypeTemplateArgument(S, Loc, T)); |
1078 | |
1079 | // If there's no tuple_size specialization or the lookup of 'value' is empty, |
1080 | // it's not tuple-like. |
1081 | if (lookupStdTypeTraitMember(S, R, Loc, "tuple_size", Args, /*DiagID*/ 0) || |
1082 | R.empty()) |
1083 | return IsTupleLike::NotTupleLike; |
1084 | |
1085 | // If we get this far, we've committed to the tuple interpretation, but |
1086 | // we can still fail if there actually isn't a usable ::value. |
1087 | |
1088 | struct ICEDiagnoser : Sema::VerifyICEDiagnoser { |
1089 | LookupResult &R; |
1090 | TemplateArgumentListInfo &Args; |
1091 | ICEDiagnoser(LookupResult &R, TemplateArgumentListInfo &Args) |
1092 | : R(R), Args(Args) {} |
1093 | Sema::SemaDiagnosticBuilder diagnoseNotICE(Sema &S, |
1094 | SourceLocation Loc) override { |
1095 | return S.Diag(Loc, diag::err_decomp_decl_std_tuple_size_not_constant) |
1096 | << printTemplateArgs(S.Context.getPrintingPolicy(), Args, |
1097 | /*Params*/ nullptr); |
1098 | } |
1099 | } Diagnoser(R, Args); |
1100 | |
1101 | ExprResult E = |
1102 | S.BuildDeclarationNameExpr(CXXScopeSpec(), R, /*NeedsADL*/false); |
1103 | if (E.isInvalid()) |
1104 | return IsTupleLike::Error; |
1105 | |
1106 | E = S.VerifyIntegerConstantExpression(E.get(), &Size, Diagnoser); |
1107 | if (E.isInvalid()) |
1108 | return IsTupleLike::Error; |
1109 | |
1110 | return IsTupleLike::TupleLike; |
1111 | } |
1112 | |
1113 | /// \return std::tuple_element<I, T>::type. |
1114 | static QualType getTupleLikeElementType(Sema &S, SourceLocation Loc, |
1115 | unsigned I, QualType T) { |
1116 | // Form template argument list for tuple_element<I, T>. |
1117 | TemplateArgumentListInfo Args(Loc, Loc); |
1118 | Args.addArgument( |
1119 | getTrivialIntegralTemplateArgument(S, Loc, S.Context.getSizeType(), I)); |
1120 | Args.addArgument(getTrivialTypeTemplateArgument(S, Loc, T)); |
1121 | |
1122 | DeclarationName TypeDN = S.PP.getIdentifierInfo("type"); |
1123 | LookupResult R(S, TypeDN, Loc, Sema::LookupOrdinaryName); |
1124 | if (lookupStdTypeTraitMember( |
1125 | S, R, Loc, "tuple_element", Args, |
1126 | diag::err_decomp_decl_std_tuple_element_not_specialized)) |
1127 | return QualType(); |
1128 | |
1129 | auto *TD = R.getAsSingle<TypeDecl>(); |
1130 | if (!TD) { |
1131 | R.suppressDiagnostics(); |
1132 | S.Diag(Loc, diag::err_decomp_decl_std_tuple_element_not_specialized) |
1133 | << printTemplateArgs(S.Context.getPrintingPolicy(), Args, |
1134 | /*Params*/ nullptr); |
1135 | if (!R.empty()) |
1136 | S.Diag(R.getRepresentativeDecl()->getLocation(), diag::note_declared_at); |
1137 | return QualType(); |
1138 | } |
1139 | |
1140 | return S.Context.getTypeDeclType(TD); |
1141 | } |
1142 | |
1143 | namespace { |
1144 | struct InitializingBinding { |
1145 | Sema &S; |
1146 | InitializingBinding(Sema &S, BindingDecl *BD) : S(S) { |
1147 | Sema::CodeSynthesisContext Ctx; |
1148 | Ctx.Kind = Sema::CodeSynthesisContext::InitializingStructuredBinding; |
1149 | Ctx.PointOfInstantiation = BD->getLocation(); |
1150 | Ctx.Entity = BD; |
1151 | S.pushCodeSynthesisContext(Ctx); |
1152 | } |
1153 | ~InitializingBinding() { |
1154 | S.popCodeSynthesisContext(); |
1155 | } |
1156 | }; |
1157 | } |
1158 | |
1159 | static bool checkTupleLikeDecomposition(Sema &S, |
1160 | ArrayRef<BindingDecl *> Bindings, |
1161 | VarDecl *Src, QualType DecompType, |
1162 | const llvm::APSInt &TupleSize) { |
1163 | if ((int64_t)Bindings.size() != TupleSize) { |
1164 | S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings) |
1165 | << DecompType << (unsigned)Bindings.size() |
1166 | << (unsigned)TupleSize.getLimitedValue(UINT_MAX(2147483647 *2U +1U)) |
1167 | << toString(TupleSize, 10) << (TupleSize < Bindings.size()); |
1168 | return true; |
1169 | } |
1170 | |
1171 | if (Bindings.empty()) |
1172 | return false; |
1173 | |
1174 | DeclarationName GetDN = S.PP.getIdentifierInfo("get"); |
1175 | |
1176 | // [dcl.decomp]p3: |
1177 | // The unqualified-id get is looked up in the scope of E by class member |
1178 | // access lookup ... |
1179 | LookupResult MemberGet(S, GetDN, Src->getLocation(), Sema::LookupMemberName); |
1180 | bool UseMemberGet = false; |
1181 | if (S.isCompleteType(Src->getLocation(), DecompType)) { |
1182 | if (auto *RD = DecompType->getAsCXXRecordDecl()) |
1183 | S.LookupQualifiedName(MemberGet, RD); |
1184 | if (MemberGet.isAmbiguous()) |
1185 | return true; |
1186 | // ... and if that finds at least one declaration that is a function |
1187 | // template whose first template parameter is a non-type parameter ... |
1188 | for (NamedDecl *D : MemberGet) { |
1189 | if (FunctionTemplateDecl *FTD = |
1190 | dyn_cast<FunctionTemplateDecl>(D->getUnderlyingDecl())) { |
1191 | TemplateParameterList *TPL = FTD->getTemplateParameters(); |
1192 | if (TPL->size() != 0 && |
1193 | isa<NonTypeTemplateParmDecl>(TPL->getParam(0))) { |
1194 | // ... the initializer is e.get<i>(). |
1195 | UseMemberGet = true; |
1196 | break; |
1197 | } |
1198 | } |
1199 | } |
1200 | } |
1201 | |
1202 | unsigned I = 0; |
1203 | for (auto *B : Bindings) { |
1204 | InitializingBinding InitContext(S, B); |
1205 | SourceLocation Loc = B->getLocation(); |
1206 | |
1207 | ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc); |
1208 | if (E.isInvalid()) |
1209 | return true; |
1210 | |
1211 | // e is an lvalue if the type of the entity is an lvalue reference and |
1212 | // an xvalue otherwise |
1213 | if (!Src->getType()->isLValueReferenceType()) |
1214 | E = ImplicitCastExpr::Create(S.Context, E.get()->getType(), CK_NoOp, |
1215 | E.get(), nullptr, VK_XValue, |
1216 | FPOptionsOverride()); |
1217 | |
1218 | TemplateArgumentListInfo Args(Loc, Loc); |
1219 | Args.addArgument( |
1220 | getTrivialIntegralTemplateArgument(S, Loc, S.Context.getSizeType(), I)); |
1221 | |
1222 | if (UseMemberGet) { |
1223 | // if [lookup of member get] finds at least one declaration, the |
1224 | // initializer is e.get<i-1>(). |
1225 | E = S.BuildMemberReferenceExpr(E.get(), DecompType, Loc, false, |
1226 | CXXScopeSpec(), SourceLocation(), nullptr, |
1227 | MemberGet, &Args, nullptr); |
1228 | if (E.isInvalid()) |
1229 | return true; |
1230 | |
1231 | E = S.BuildCallExpr(nullptr, E.get(), Loc, None, Loc); |
1232 | } else { |
1233 | // Otherwise, the initializer is get<i-1>(e), where get is looked up |
1234 | // in the associated namespaces. |
1235 | Expr *Get = UnresolvedLookupExpr::Create( |
1236 | S.Context, nullptr, NestedNameSpecifierLoc(), SourceLocation(), |
1237 | DeclarationNameInfo(GetDN, Loc), /*RequiresADL*/true, &Args, |
1238 | UnresolvedSetIterator(), UnresolvedSetIterator()); |
1239 | |
1240 | Expr *Arg = E.get(); |
1241 | E = S.BuildCallExpr(nullptr, Get, Loc, Arg, Loc); |
1242 | } |
1243 | if (E.isInvalid()) |
1244 | return true; |
1245 | Expr *Init = E.get(); |
1246 | |
1247 | // Given the type T designated by std::tuple_element<i - 1, E>::type, |
1248 | QualType T = getTupleLikeElementType(S, Loc, I, DecompType); |
1249 | if (T.isNull()) |
1250 | return true; |
1251 | |
1252 | // each vi is a variable of type "reference to T" initialized with the |
1253 | // initializer, where the reference is an lvalue reference if the |
1254 | // initializer is an lvalue and an rvalue reference otherwise |
1255 | QualType RefType = |
1256 | S.BuildReferenceType(T, E.get()->isLValue(), Loc, B->getDeclName()); |
1257 | if (RefType.isNull()) |
1258 | return true; |
1259 | auto *RefVD = VarDecl::Create( |
1260 | S.Context, Src->getDeclContext(), Loc, Loc, |
1261 | B->getDeclName().getAsIdentifierInfo(), RefType, |
1262 | S.Context.getTrivialTypeSourceInfo(T, Loc), Src->getStorageClass()); |
1263 | RefVD->setLexicalDeclContext(Src->getLexicalDeclContext()); |
1264 | RefVD->setTSCSpec(Src->getTSCSpec()); |
1265 | RefVD->setImplicit(); |
1266 | if (Src->isInlineSpecified()) |
1267 | RefVD->setInlineSpecified(); |
1268 | RefVD->getLexicalDeclContext()->addHiddenDecl(RefVD); |
1269 | |
1270 | InitializedEntity Entity = InitializedEntity::InitializeBinding(RefVD); |
1271 | InitializationKind Kind = InitializationKind::CreateCopy(Loc, Loc); |
1272 | InitializationSequence Seq(S, Entity, Kind, Init); |
1273 | E = Seq.Perform(S, Entity, Kind, Init); |
1274 | if (E.isInvalid()) |
1275 | return true; |
1276 | E = S.ActOnFinishFullExpr(E.get(), Loc, /*DiscardedValue*/ false); |
1277 | if (E.isInvalid()) |
1278 | return true; |
1279 | RefVD->setInit(E.get()); |
1280 | S.CheckCompleteVariableDeclaration(RefVD); |
1281 | |
1282 | E = S.BuildDeclarationNameExpr(CXXScopeSpec(), |
1283 | DeclarationNameInfo(B->getDeclName(), Loc), |
1284 | RefVD); |
1285 | if (E.isInvalid()) |
1286 | return true; |
1287 | |
1288 | B->setBinding(T, E.get()); |
1289 | I++; |
1290 | } |
1291 | |
1292 | return false; |
1293 | } |
1294 | |
1295 | /// Find the base class to decompose in a built-in decomposition of a class type. |
1296 | /// This base class search is, unfortunately, not quite like any other that we |
1297 | /// perform anywhere else in C++. |
1298 | static DeclAccessPair findDecomposableBaseClass(Sema &S, SourceLocation Loc, |
1299 | const CXXRecordDecl *RD, |
1300 | CXXCastPath &BasePath) { |
1301 | auto BaseHasFields = [](const CXXBaseSpecifier *Specifier, |
1302 | CXXBasePath &Path) { |
1303 | return Specifier->getType()->getAsCXXRecordDecl()->hasDirectFields(); |
1304 | }; |
1305 | |
1306 | const CXXRecordDecl *ClassWithFields = nullptr; |
1307 | AccessSpecifier AS = AS_public; |
1308 | if (RD->hasDirectFields()) |
1309 | // [dcl.decomp]p4: |
1310 | // Otherwise, all of E's non-static data members shall be public direct |
1311 | // members of E ... |
1312 | ClassWithFields = RD; |
1313 | else { |
1314 | // ... or of ... |
1315 | CXXBasePaths Paths; |
1316 | Paths.setOrigin(const_cast<CXXRecordDecl*>(RD)); |
1317 | if (!RD->lookupInBases(BaseHasFields, Paths)) { |
1318 | // If no classes have fields, just decompose RD itself. (This will work |
1319 | // if and only if zero bindings were provided.) |
1320 | return DeclAccessPair::make(const_cast<CXXRecordDecl*>(RD), AS_public); |
1321 | } |
1322 | |
1323 | CXXBasePath *BestPath = nullptr; |
1324 | for (auto &P : Paths) { |
1325 | if (!BestPath) |
1326 | BestPath = &P; |
1327 | else if (!S.Context.hasSameType(P.back().Base->getType(), |
1328 | BestPath->back().Base->getType())) { |
1329 | // ... the same ... |
1330 | S.Diag(Loc, diag::err_decomp_decl_multiple_bases_with_members) |
1331 | << false << RD << BestPath->back().Base->getType() |
1332 | << P.back().Base->getType(); |
1333 | return DeclAccessPair(); |
1334 | } else if (P.Access < BestPath->Access) { |
1335 | BestPath = &P; |
1336 | } |
1337 | } |
1338 | |
1339 | // ... unambiguous ... |
1340 | QualType BaseType = BestPath->back().Base->getType(); |
1341 | if (Paths.isAmbiguous(S.Context.getCanonicalType(BaseType))) { |
1342 | S.Diag(Loc, diag::err_decomp_decl_ambiguous_base) |
1343 | << RD << BaseType << S.getAmbiguousPathsDisplayString(Paths); |
1344 | return DeclAccessPair(); |
1345 | } |
1346 | |
1347 | // ... [accessible, implied by other rules] base class of E. |
1348 | S.CheckBaseClassAccess(Loc, BaseType, S.Context.getRecordType(RD), |
1349 | *BestPath, diag::err_decomp_decl_inaccessible_base); |
1350 | AS = BestPath->Access; |
1351 | |
1352 | ClassWithFields = BaseType->getAsCXXRecordDecl(); |
1353 | S.BuildBasePathArray(Paths, BasePath); |
1354 | } |
1355 | |
1356 | // The above search did not check whether the selected class itself has base |
1357 | // classes with fields, so check that now. |
1358 | CXXBasePaths Paths; |
1359 | if (ClassWithFields->lookupInBases(BaseHasFields, Paths)) { |
1360 | S.Diag(Loc, diag::err_decomp_decl_multiple_bases_with_members) |
1361 | << (ClassWithFields == RD) << RD << ClassWithFields |
1362 | << Paths.front().back().Base->getType(); |
1363 | return DeclAccessPair(); |
1364 | } |
1365 | |
1366 | return DeclAccessPair::make(const_cast<CXXRecordDecl*>(ClassWithFields), AS); |
1367 | } |
1368 | |
1369 | static bool checkMemberDecomposition(Sema &S, ArrayRef<BindingDecl*> Bindings, |
1370 | ValueDecl *Src, QualType DecompType, |
1371 | const CXXRecordDecl *OrigRD) { |
1372 | if (S.RequireCompleteType(Src->getLocation(), DecompType, |
1373 | diag::err_incomplete_type)) |
1374 | return true; |
1375 | |
1376 | CXXCastPath BasePath; |
1377 | DeclAccessPair BasePair = |
1378 | findDecomposableBaseClass(S, Src->getLocation(), OrigRD, BasePath); |
1379 | const CXXRecordDecl *RD = cast_or_null<CXXRecordDecl>(BasePair.getDecl()); |
1380 | if (!RD) |
1381 | return true; |
1382 | QualType BaseType = S.Context.getQualifiedType(S.Context.getRecordType(RD), |
1383 | DecompType.getQualifiers()); |
1384 | |
1385 | auto DiagnoseBadNumberOfBindings = [&]() -> bool { |
1386 | unsigned NumFields = |
1387 | std::count_if(RD->field_begin(), RD->field_end(), |
1388 | [](FieldDecl *FD) { return !FD->isUnnamedBitfield(); }); |
1389 | assert(Bindings.size() != NumFields)((void)0); |
1390 | S.Diag(Src->getLocation(), diag::err_decomp_decl_wrong_number_bindings) |
1391 | << DecompType << (unsigned)Bindings.size() << NumFields << NumFields |
1392 | << (NumFields < Bindings.size()); |
1393 | return true; |
1394 | }; |
1395 | |
1396 | // all of E's non-static data members shall be [...] well-formed |
1397 | // when named as e.name in the context of the structured binding, |
1398 | // E shall not have an anonymous union member, ... |
1399 | unsigned I = 0; |
1400 | for (auto *FD : RD->fields()) { |
1401 | if (FD->isUnnamedBitfield()) |
1402 | continue; |
1403 | |
1404 | // All the non-static data members are required to be nameable, so they |
1405 | // must all have names. |
1406 | if (!FD->getDeclName()) { |
1407 | if (RD->isLambda()) { |
1408 | S.Diag(Src->getLocation(), diag::err_decomp_decl_lambda); |
1409 | S.Diag(RD->getLocation(), diag::note_lambda_decl); |
1410 | return true; |
1411 | } |
1412 | |
1413 | if (FD->isAnonymousStructOrUnion()) { |
1414 | S.Diag(Src->getLocation(), diag::err_decomp_decl_anon_union_member) |
1415 | << DecompType << FD->getType()->isUnionType(); |
1416 | S.Diag(FD->getLocation(), diag::note_declared_at); |
1417 | return true; |
1418 | } |
1419 | |
1420 | // FIXME: Are there any other ways we could have an anonymous member? |
1421 | } |
1422 | |
1423 | // We have a real field to bind. |
1424 | if (I >= Bindings.size()) |
1425 | return DiagnoseBadNumberOfBindings(); |
1426 | auto *B = Bindings[I++]; |
1427 | SourceLocation Loc = B->getLocation(); |
1428 | |
1429 | // The field must be accessible in the context of the structured binding. |
1430 | // We already checked that the base class is accessible. |
1431 | // FIXME: Add 'const' to AccessedEntity's classes so we can remove the |
1432 | // const_cast here. |
1433 | S.CheckStructuredBindingMemberAccess( |
1434 | Loc, const_cast<CXXRecordDecl *>(OrigRD), |
1435 | DeclAccessPair::make(FD, CXXRecordDecl::MergeAccess( |
1436 | BasePair.getAccess(), FD->getAccess()))); |
1437 | |
1438 | // Initialize the binding to Src.FD. |
1439 | ExprResult E = S.BuildDeclRefExpr(Src, DecompType, VK_LValue, Loc); |
1440 | if (E.isInvalid()) |
1441 | return true; |
1442 | E = S.ImpCastExprToType(E.get(), BaseType, CK_UncheckedDerivedToBase, |
1443 | VK_LValue, &BasePath); |
1444 | if (E.isInvalid()) |
1445 | return true; |
1446 | E = S.BuildFieldReferenceExpr(E.get(), /*IsArrow*/ false, Loc, |
1447 | CXXScopeSpec(), FD, |
1448 | DeclAccessPair::make(FD, FD->getAccess()), |
1449 | DeclarationNameInfo(FD->getDeclName(), Loc)); |
1450 | if (E.isInvalid()) |
1451 | return true; |
1452 | |
1453 | // If the type of the member is T, the referenced type is cv T, where cv is |
1454 | // the cv-qualification of the decomposition expression. |
1455 | // |
1456 | // FIXME: We resolve a defect here: if the field is mutable, we do not add |
1457 | // 'const' to the type of the field. |
1458 | Qualifiers Q = DecompType.getQualifiers(); |
1459 | if (FD->isMutable()) |
1460 | Q.removeConst(); |
1461 | B->setBinding(S.BuildQualifiedType(FD->getType(), Loc, Q), E.get()); |
1462 | } |
1463 | |
1464 | if (I != Bindings.size()) |
1465 | return DiagnoseBadNumberOfBindings(); |
1466 | |
1467 | return false; |
1468 | } |
1469 | |
1470 | void Sema::CheckCompleteDecompositionDeclaration(DecompositionDecl *DD) { |
1471 | QualType DecompType = DD->getType(); |
1472 | |
1473 | // If the type of the decomposition is dependent, then so is the type of |
1474 | // each binding. |
1475 | if (DecompType->isDependentType()) { |
1476 | for (auto *B : DD->bindings()) |
1477 | B->setType(Context.DependentTy); |
1478 | return; |
1479 | } |
1480 | |
1481 | DecompType = DecompType.getNonReferenceType(); |
1482 | ArrayRef<BindingDecl*> Bindings = DD->bindings(); |
1483 | |
1484 | // C++1z [dcl.decomp]/2: |
1485 | // If E is an array type [...] |
1486 | // As an extension, we also support decomposition of built-in complex and |
1487 | // vector types. |
1488 | if (auto *CAT = Context.getAsConstantArrayType(DecompType)) { |
1489 | if (checkArrayDecomposition(*this, Bindings, DD, DecompType, CAT)) |
1490 | DD->setInvalidDecl(); |
1491 | return; |
1492 | } |
1493 | if (auto *VT = DecompType->getAs<VectorType>()) { |
1494 | if (checkVectorDecomposition(*this, Bindings, DD, DecompType, VT)) |
1495 | DD->setInvalidDecl(); |
1496 | return; |
1497 | } |
1498 | if (auto *CT = DecompType->getAs<ComplexType>()) { |
1499 | if (checkComplexDecomposition(*this, Bindings, DD, DecompType, CT)) |
1500 | DD->setInvalidDecl(); |
1501 | return; |
1502 | } |
1503 | |
1504 | // C++1z [dcl.decomp]/3: |
1505 | // if the expression std::tuple_size<E>::value is a well-formed integral |
1506 | // constant expression, [...] |
1507 | llvm::APSInt TupleSize(32); |
1508 | switch (isTupleLike(*this, DD->getLocation(), DecompType, TupleSize)) { |
1509 | case IsTupleLike::Error: |
1510 | DD->setInvalidDecl(); |
1511 | return; |
1512 | |
1513 | case IsTupleLike::TupleLike: |
1514 | if (checkTupleLikeDecomposition(*this, Bindings, DD, DecompType, TupleSize)) |
1515 | DD->setInvalidDecl(); |
1516 | return; |
1517 | |
1518 | case IsTupleLike::NotTupleLike: |
1519 | break; |
1520 | } |
1521 | |
1522 | // C++1z [dcl.dcl]/8: |
1523 | // [E shall be of array or non-union class type] |
1524 | CXXRecordDecl *RD = DecompType->getAsCXXRecordDecl(); |
1525 | if (!RD || RD->isUnion()) { |
1526 | Diag(DD->getLocation(), diag::err_decomp_decl_unbindable_type) |
1527 | << DD << !RD << DecompType; |
1528 | DD->setInvalidDecl(); |
1529 | return; |
1530 | } |
1531 | |
1532 | // C++1z [dcl.decomp]/4: |
1533 | // all of E's non-static data members shall be [...] direct members of |
1534 | // E or of the same unambiguous public base class of E, ... |
1535 | if (checkMemberDecomposition(*this, Bindings, DD, DecompType, RD)) |
1536 | DD->setInvalidDecl(); |
1537 | } |
1538 | |
1539 | /// Merge the exception specifications of two variable declarations. |
1540 | /// |
1541 | /// This is called when there's a redeclaration of a VarDecl. The function |
1542 | /// checks if the redeclaration might have an exception specification and |
1543 | /// validates compatibility and merges the specs if necessary. |
1544 | void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { |
1545 | // Shortcut if exceptions are disabled. |
1546 | if (!getLangOpts().CXXExceptions) |
1547 | return; |
1548 | |
1549 | assert(Context.hasSameType(New->getType(), Old->getType()) &&((void)0) |
1550 | "Should only be called if types are otherwise the same.")((void)0); |
1551 | |
1552 | QualType NewType = New->getType(); |
1553 | QualType OldType = Old->getType(); |
1554 | |
1555 | // We're only interested in pointers and references to functions, as well |
1556 | // as pointers to member functions. |
1557 | if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { |
1558 | NewType = R->getPointeeType(); |
1559 | OldType = OldType->castAs<ReferenceType>()->getPointeeType(); |
1560 | } else if (const PointerType *P = NewType->getAs<PointerType>()) { |
1561 | NewType = P->getPointeeType(); |
1562 | OldType = OldType->castAs<PointerType>()->getPointeeType(); |
1563 | } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { |
1564 | NewType = M->getPointeeType(); |
1565 | OldType = OldType->castAs<MemberPointerType>()->getPointeeType(); |
1566 | } |
1567 | |
1568 | if (!NewType->isFunctionProtoType()) |
1569 | return; |
1570 | |
1571 | // There's lots of special cases for functions. For function pointers, system |
1572 | // libraries are hopefully not as broken so that we don't need these |
1573 | // workarounds. |
1574 | if (CheckEquivalentExceptionSpec( |
1575 | OldType->getAs<FunctionProtoType>(), Old->getLocation(), |
1576 | NewType->getAs<FunctionProtoType>(), New->getLocation())) { |
1577 | New->setInvalidDecl(); |
1578 | } |
1579 | } |
1580 | |
1581 | /// CheckCXXDefaultArguments - Verify that the default arguments for a |
1582 | /// function declaration are well-formed according to C++ |
1583 | /// [dcl.fct.default]. |
1584 | void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { |
1585 | unsigned NumParams = FD->getNumParams(); |
1586 | unsigned ParamIdx = 0; |
1587 | |
1588 | // This checking doesn't make sense for explicit specializations; their |
1589 | // default arguments are determined by the declaration we're specializing, |
1590 | // not by FD. |
1591 | if (FD->getTemplateSpecializationKind() == TSK_ExplicitSpecialization) |
1592 | return; |
1593 | if (auto *FTD = FD->getDescribedFunctionTemplate()) |
1594 | if (FTD->isMemberSpecialization()) |
1595 | return; |
1596 | |
1597 | // Find first parameter with a default argument |
1598 | for (; ParamIdx < NumParams; ++ParamIdx) { |
1599 | ParmVarDecl *Param = FD->getParamDecl(ParamIdx); |
1600 | if (Param->hasDefaultArg()) |
1601 | break; |
1602 | } |
1603 | |
1604 | // C++20 [dcl.fct.default]p4: |
1605 | // In a given function declaration, each parameter subsequent to a parameter |
1606 | // with a default argument shall have a default argument supplied in this or |
1607 | // a previous declaration, unless the parameter was expanded from a |
1608 | // parameter pack, or shall be a function parameter pack. |
1609 | for (; ParamIdx < NumParams; ++ParamIdx) { |
1610 | ParmVarDecl *Param = FD->getParamDecl(ParamIdx); |
1611 | if (!Param->hasDefaultArg() && !Param->isParameterPack() && |
1612 | !(CurrentInstantiationScope && |
1613 | CurrentInstantiationScope->isLocalPackExpansion(Param))) { |
1614 | if (Param->isInvalidDecl()) |
1615 | /* We already complained about this parameter. */; |
1616 | else if (Param->getIdentifier()) |
1617 | Diag(Param->getLocation(), |
1618 | diag::err_param_default_argument_missing_name) |
1619 | << Param->getIdentifier(); |
1620 | else |
1621 | Diag(Param->getLocation(), |
1622 | diag::err_param_default_argument_missing); |
1623 | } |
1624 | } |
1625 | } |
1626 | |
1627 | /// Check that the given type is a literal type. Issue a diagnostic if not, |
1628 | /// if Kind is Diagnose. |
1629 | /// \return \c true if a problem has been found (and optionally diagnosed). |
1630 | template <typename... Ts> |
1631 | static bool CheckLiteralType(Sema &SemaRef, Sema::CheckConstexprKind Kind, |
1632 | SourceLocation Loc, QualType T, unsigned DiagID, |
1633 | Ts &&...DiagArgs) { |
1634 | if (T->isDependentType()) |
1635 | return false; |
1636 | |
1637 | switch (Kind) { |
1638 | case Sema::CheckConstexprKind::Diagnose: |
1639 | return SemaRef.RequireLiteralType(Loc, T, DiagID, |
1640 | std::forward<Ts>(DiagArgs)...); |
1641 | |
1642 | case Sema::CheckConstexprKind::CheckValid: |
1643 | return !T->isLiteralType(SemaRef.Context); |
1644 | } |
1645 | |
1646 | llvm_unreachable("unknown CheckConstexprKind")__builtin_unreachable(); |
1647 | } |
1648 | |
1649 | /// Determine whether a destructor cannot be constexpr due to |
1650 | static bool CheckConstexprDestructorSubobjects(Sema &SemaRef, |
1651 | const CXXDestructorDecl *DD, |
1652 | Sema::CheckConstexprKind Kind) { |
1653 | auto Check = [&](SourceLocation Loc, QualType T, const FieldDecl *FD) { |
1654 | const CXXRecordDecl *RD = |
1655 | T->getBaseElementTypeUnsafe()->getAsCXXRecordDecl(); |
1656 | if (!RD || RD->hasConstexprDestructor()) |
1657 | return true; |
1658 | |
1659 | if (Kind == Sema::CheckConstexprKind::Diagnose) { |
1660 | SemaRef.Diag(DD->getLocation(), diag::err_constexpr_dtor_subobject) |
1661 | << static_cast<int>(DD->getConstexprKind()) << !FD |
1662 | << (FD ? FD->getDeclName() : DeclarationName()) << T; |
1663 | SemaRef.Diag(Loc, diag::note_constexpr_dtor_subobject) |
1664 | << !FD << (FD ? FD->getDeclName() : DeclarationName()) << T; |
1665 | } |
1666 | return false; |
1667 | }; |
1668 | |
1669 | const CXXRecordDecl *RD = DD->getParent(); |
1670 | for (const CXXBaseSpecifier &B : RD->bases()) |
1671 | if (!Check(B.getBaseTypeLoc(), B.getType(), nullptr)) |
1672 | return false; |
1673 | for (const FieldDecl *FD : RD->fields()) |
1674 | if (!Check(FD->getLocation(), FD->getType(), FD)) |
1675 | return false; |
1676 | return true; |
1677 | } |
1678 | |
1679 | /// Check whether a function's parameter types are all literal types. If so, |
1680 | /// return true. If not, produce a suitable diagnostic and return false. |
1681 | static bool CheckConstexprParameterTypes(Sema &SemaRef, |
1682 | const FunctionDecl *FD, |
1683 | Sema::CheckConstexprKind Kind) { |
1684 | unsigned ArgIndex = 0; |
1685 | const auto *FT = FD->getType()->castAs<FunctionProtoType>(); |
1686 | for (FunctionProtoType::param_type_iterator i = FT->param_type_begin(), |
1687 | e = FT->param_type_end(); |
1688 | i != e; ++i, ++ArgIndex) { |
1689 | const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); |
1690 | SourceLocation ParamLoc = PD->getLocation(); |
1691 | if (CheckLiteralType(SemaRef, Kind, ParamLoc, *i, |
1692 | diag::err_constexpr_non_literal_param, ArgIndex + 1, |
1693 | PD->getSourceRange(), isa<CXXConstructorDecl>(FD), |
1694 | FD->isConsteval())) |
1695 | return false; |
1696 | } |
1697 | return true; |
1698 | } |
1699 | |
1700 | /// Check whether a function's return type is a literal type. If so, return |
1701 | /// true. If not, produce a suitable diagnostic and return false. |
1702 | static bool CheckConstexprReturnType(Sema &SemaRef, const FunctionDecl *FD, |
1703 | Sema::CheckConstexprKind Kind) { |
1704 | if (CheckLiteralType(SemaRef, Kind, FD->getLocation(), FD->getReturnType(), |
1705 | diag::err_constexpr_non_literal_return, |
1706 | FD->isConsteval())) |
1707 | return false; |
1708 | return true; |
1709 | } |
1710 | |
1711 | /// Get diagnostic %select index for tag kind for |
1712 | /// record diagnostic message. |
1713 | /// WARNING: Indexes apply to particular diagnostics only! |
1714 | /// |
1715 | /// \returns diagnostic %select index. |
1716 | static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) { |
1717 | switch (Tag) { |
1718 | case TTK_Struct: return 0; |
1719 | case TTK_Interface: return 1; |
1720 | case TTK_Class: return 2; |
1721 | default: llvm_unreachable("Invalid tag kind for record diagnostic!")__builtin_unreachable(); |
1722 | } |
1723 | } |
1724 | |
1725 | static bool CheckConstexprFunctionBody(Sema &SemaRef, const FunctionDecl *Dcl, |
1726 | Stmt *Body, |
1727 | Sema::CheckConstexprKind Kind); |
1728 | |
1729 | // Check whether a function declaration satisfies the requirements of a |
1730 | // constexpr function definition or a constexpr constructor definition. If so, |
1731 | // return true. If not, produce appropriate diagnostics (unless asked not to by |
1732 | // Kind) and return false. |
1733 | // |
1734 | // This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. |
1735 | bool Sema::CheckConstexprFunctionDefinition(const FunctionDecl *NewFD, |
1736 | CheckConstexprKind Kind) { |
1737 | const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); |
1738 | if (MD && MD->isInstance()) { |
1739 | // C++11 [dcl.constexpr]p4: |
1740 | // The definition of a constexpr constructor shall satisfy the following |
1741 | // constraints: |
1742 | // - the class shall not have any virtual base classes; |
1743 | // |
1744 | // FIXME: This only applies to constructors and destructors, not arbitrary |
1745 | // member functions. |
1746 | const CXXRecordDecl *RD = MD->getParent(); |
1747 | if (RD->getNumVBases()) { |
1748 | if (Kind == CheckConstexprKind::CheckValid) |
1749 | return false; |
1750 | |
1751 | Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) |
1752 | << isa<CXXConstructorDecl>(NewFD) |
1753 | << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); |
1754 | for (const auto &I : RD->vbases()) |
1755 | Diag(I.getBeginLoc(), diag::note_constexpr_virtual_base_here) |
1756 | << I.getSourceRange(); |
1757 | return false; |
1758 | } |
1759 | } |
1760 | |
1761 | if (!isa<CXXConstructorDecl>(NewFD)) { |
1762 | // C++11 [dcl.constexpr]p3: |
1763 | // The definition of a constexpr function shall satisfy the following |
1764 | // constraints: |
1765 | // - it shall not be virtual; (removed in C++20) |
1766 | const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); |
1767 | if (Method && Method->isVirtual()) { |
1768 | if (getLangOpts().CPlusPlus20) { |
1769 | if (Kind == CheckConstexprKind::Diagnose) |
1770 | Diag(Method->getLocation(), diag::warn_cxx17_compat_constexpr_virtual); |
1771 | } else { |
1772 | if (Kind == CheckConstexprKind::CheckValid) |
1773 | return false; |
1774 | |
1775 | Method = Method->getCanonicalDecl(); |
1776 | Diag(Method->getLocation(), diag::err_constexpr_virtual); |
1777 | |
1778 | // If it's not obvious why this function is virtual, find an overridden |
1779 | // function which uses the 'virtual' keyword. |
1780 | const CXXMethodDecl *WrittenVirtual = Method; |
1781 | while (!WrittenVirtual->isVirtualAsWritten()) |
1782 | WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); |
1783 | if (WrittenVirtual != Method) |
1784 | Diag(WrittenVirtual->getLocation(), |
1785 | diag::note_overridden_virtual_function); |
1786 | return false; |
1787 | } |
1788 | } |
1789 | |
1790 | // - its return type shall be a literal type; |
1791 | if (!CheckConstexprReturnType(*this, NewFD, Kind)) |
1792 | return false; |
1793 | } |
1794 | |
1795 | if (auto *Dtor = dyn_cast<CXXDestructorDecl>(NewFD)) { |
1796 | // A destructor can be constexpr only if the defaulted destructor could be; |
1797 | // we don't need to check the members and bases if we already know they all |
1798 | // have constexpr destructors. |
1799 | if (!Dtor->getParent()->defaultedDestructorIsConstexpr()) { |
1800 | if (Kind == CheckConstexprKind::CheckValid) |
1801 | return false; |
1802 | if (!CheckConstexprDestructorSubobjects(*this, Dtor, Kind)) |
1803 | return false; |
1804 | } |
1805 | } |
1806 | |
1807 | // - each of its parameter types shall be a literal type; |
1808 | if (!CheckConstexprParameterTypes(*this, NewFD, Kind)) |
1809 | return false; |
1810 | |
1811 | Stmt *Body = NewFD->getBody(); |
1812 | assert(Body &&((void)0) |
1813 | "CheckConstexprFunctionDefinition called on function with no body")((void)0); |
1814 | return CheckConstexprFunctionBody(*this, NewFD, Body, Kind); |
1815 | } |
1816 | |
1817 | /// Check the given declaration statement is legal within a constexpr function |
1818 | /// body. C++11 [dcl.constexpr]p3,p4, and C++1y [dcl.constexpr]p3. |
1819 | /// |
1820 | /// \return true if the body is OK (maybe only as an extension), false if we |
1821 | /// have diagnosed a problem. |
1822 | static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, |
1823 | DeclStmt *DS, SourceLocation &Cxx1yLoc, |
1824 | Sema::CheckConstexprKind Kind) { |
1825 | // C++11 [dcl.constexpr]p3 and p4: |
1826 | // The definition of a constexpr function(p3) or constructor(p4) [...] shall |
1827 | // contain only |
1828 | for (const auto *DclIt : DS->decls()) { |
1829 | switch (DclIt->getKind()) { |
1830 | case Decl::StaticAssert: |
1831 | case Decl::Using: |
1832 | case Decl::UsingShadow: |
1833 | case Decl::UsingDirective: |
1834 | case Decl::UnresolvedUsingTypename: |
1835 | case Decl::UnresolvedUsingValue: |
1836 | case Decl::UsingEnum: |
1837 | // - static_assert-declarations |
1838 | // - using-declarations, |
1839 | // - using-directives, |
1840 | // - using-enum-declaration |
1841 | continue; |
1842 | |
1843 | case Decl::Typedef: |
1844 | case Decl::TypeAlias: { |
1845 | // - typedef declarations and alias-declarations that do not define |
1846 | // classes or enumerations, |
1847 | const auto *TN = cast<TypedefNameDecl>(DclIt); |
1848 | if (TN->getUnderlyingType()->isVariablyModifiedType()) { |
1849 | // Don't allow variably-modified types in constexpr functions. |
1850 | if (Kind == Sema::CheckConstexprKind::Diagnose) { |
1851 | TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); |
1852 | SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) |
1853 | << TL.getSourceRange() << TL.getType() |
1854 | << isa<CXXConstructorDecl>(Dcl); |
1855 | } |
1856 | return false; |
1857 | } |
1858 | continue; |
1859 | } |
1860 | |
1861 | case Decl::Enum: |
1862 | case Decl::CXXRecord: |
1863 | // C++1y allows types to be defined, not just declared. |
1864 | if (cast<TagDecl>(DclIt)->isThisDeclarationADefinition()) { |
1865 | if (Kind == Sema::CheckConstexprKind::Diagnose) { |
1866 | SemaRef.Diag(DS->getBeginLoc(), |
1867 | SemaRef.getLangOpts().CPlusPlus14 |
1868 | ? diag::warn_cxx11_compat_constexpr_type_definition |
1869 | : diag::ext_constexpr_type_definition) |
1870 | << isa<CXXConstructorDecl>(Dcl); |
1871 | } else if (!SemaRef.getLangOpts().CPlusPlus14) { |
1872 | return false; |
1873 | } |
1874 | } |
1875 | continue; |
1876 | |
1877 | case Decl::EnumConstant: |
1878 | case Decl::IndirectField: |
1879 | case Decl::ParmVar: |
1880 | // These can only appear with other declarations which are banned in |
1881 | // C++11 and permitted in C++1y, so ignore them. |
1882 | continue; |
1883 | |
1884 | case Decl::Var: |
1885 | case Decl::Decomposition: { |
1886 | // C++1y [dcl.constexpr]p3 allows anything except: |
1887 | // a definition of a variable of non-literal type or of static or |
1888 | // thread storage duration or [before C++2a] for which no |
1889 | // initialization is performed. |
1890 | const auto *VD = cast<VarDecl>(DclIt); |
1891 | if (VD->isThisDeclarationADefinition()) { |
1892 | if (VD->isStaticLocal()) { |
1893 | if (Kind == Sema::CheckConstexprKind::Diagnose) { |
1894 | SemaRef.Diag(VD->getLocation(), |
1895 | diag::err_constexpr_local_var_static) |
1896 | << isa<CXXConstructorDecl>(Dcl) |
1897 | << (VD->getTLSKind() == VarDecl::TLS_Dynamic); |
1898 | } |
1899 | return false; |
1900 | } |
1901 | if (CheckLiteralType(SemaRef, Kind, VD->getLocation(), VD->getType(), |
1902 | diag::err_constexpr_local_var_non_literal_type, |
1903 | isa<CXXConstructorDecl>(Dcl))) |
1904 | return false; |
1905 | if (!VD->getType()->isDependentType() && |
1906 | !VD->hasInit() && !VD->isCXXForRangeDecl()) { |
1907 | if (Kind == Sema::CheckConstexprKind::Diagnose) { |
1908 | SemaRef.Diag( |
1909 | VD->getLocation(), |
1910 | SemaRef.getLangOpts().CPlusPlus20 |
1911 | ? diag::warn_cxx17_compat_constexpr_local_var_no_init |
1912 | : diag::ext_constexpr_local_var_no_init) |
1913 | << isa<CXXConstructorDecl>(Dcl); |
1914 | } else if (!SemaRef.getLangOpts().CPlusPlus20) { |
1915 | return false; |
1916 | } |
1917 | continue; |
1918 | } |
1919 | } |
1920 | if (Kind == Sema::CheckConstexprKind::Diagnose) { |
1921 | SemaRef.Diag(VD->getLocation(), |
1922 | SemaRef.getLangOpts().CPlusPlus14 |
1923 | ? diag::warn_cxx11_compat_constexpr_local_var |
1924 | : diag::ext_constexpr_local_var) |
1925 | << isa<CXXConstructorDecl>(Dcl); |
1926 | } else if (!SemaRef.getLangOpts().CPlusPlus14) { |
1927 | return false; |
1928 | } |
1929 | continue; |
1930 | } |
1931 | |
1932 | case Decl::NamespaceAlias: |
1933 | case Decl::Function: |
1934 | // These are disallowed in C++11 and permitted in C++1y. Allow them |
1935 | // everywhere as an extension. |
1936 | if (!Cxx1yLoc.isValid()) |
1937 | Cxx1yLoc = DS->getBeginLoc(); |
1938 | continue; |
1939 | |
1940 | default: |
1941 | if (Kind == Sema::CheckConstexprKind::Diagnose) { |
1942 | SemaRef.Diag(DS->getBeginLoc(), diag::err_constexpr_body_invalid_stmt) |
1943 | << isa<CXXConstructorDecl>(Dcl) << Dcl->isConsteval(); |
1944 | } |
1945 | return false; |
1946 | } |
1947 | } |
1948 | |
1949 | return true; |
1950 | } |
1951 | |
1952 | /// Check that the given field is initialized within a constexpr constructor. |
1953 | /// |
1954 | /// \param Dcl The constexpr constructor being checked. |
1955 | /// \param Field The field being checked. This may be a member of an anonymous |
1956 | /// struct or union nested within the class being checked. |
1957 | /// \param Inits All declarations, including anonymous struct/union members and |
1958 | /// indirect members, for which any initialization was provided. |
1959 | /// \param Diagnosed Whether we've emitted the error message yet. Used to attach |
1960 | /// multiple notes for different members to the same error. |
1961 | /// \param Kind Whether we're diagnosing a constructor as written or determining |
1962 | /// whether the formal requirements are satisfied. |
1963 | /// \return \c false if we're checking for validity and the constructor does |
1964 | /// not satisfy the requirements on a constexpr constructor. |
1965 | static bool CheckConstexprCtorInitializer(Sema &SemaRef, |
1966 | const FunctionDecl *Dcl, |
1967 | FieldDecl *Field, |
1968 | llvm::SmallSet<Decl*, 16> &Inits, |
1969 | bool &Diagnosed, |
1970 | Sema::CheckConstexprKind Kind) { |
1971 | // In C++20 onwards, there's nothing to check for validity. |
1972 | if (Kind == Sema::CheckConstexprKind::CheckValid && |
1973 | SemaRef.getLangOpts().CPlusPlus20) |
1974 | return true; |
1975 | |
1976 | if (Field->isInvalidDecl()) |
1977 | return true; |
1978 | |
1979 | if (Field->isUnnamedBitfield()) |
1980 | return true; |
1981 | |
1982 | // Anonymous unions with no variant members and empty anonymous structs do not |
1983 | // need to be explicitly initialized. FIXME: Anonymous structs that contain no |
1984 | // indirect fields don't need initializing. |
1985 | if (Field->isAnonymousStructOrUnion() && |
1986 | (Field->getType()->isUnionType() |
1987 | ? !Field->getType()->getAsCXXRecordDecl()->hasVariantMembers() |
1988 | : Field->getType()->getAsCXXRecordDecl()->isEmpty())) |
1989 | return true; |
1990 | |
1991 | if (!Inits.count(Field)) { |
1992 | if (Kind == Sema::CheckConstexprKind::Diagnose) { |
1993 | if (!Diagnosed) { |
1994 | SemaRef.Diag(Dcl->getLocation(), |
1995 | SemaRef.getLangOpts().CPlusPlus20 |
1996 | ? diag::warn_cxx17_compat_constexpr_ctor_missing_init |
1997 | : diag::ext_constexpr_ctor_missing_init); |
1998 | Diagnosed = true; |
1999 | } |
2000 | SemaRef.Diag(Field->getLocation(), |
2001 | diag::note_constexpr_ctor_missing_init); |
2002 | } else if (!SemaRef.getLangOpts().CPlusPlus20) { |
2003 | return false; |
2004 | } |
2005 | } else if (Field->isAnonymousStructOrUnion()) { |
2006 | const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); |
2007 | for (auto *I : RD->fields()) |
2008 | // If an anonymous union contains an anonymous struct of which any member |
2009 | // is initialized, all members must be initialized. |
2010 | if (!RD->isUnion() || Inits.count(I)) |
2011 | if (!CheckConstexprCtorInitializer(SemaRef, Dcl, I, Inits, Diagnosed, |
2012 | Kind)) |
2013 | return false; |
2014 | } |
2015 | return true; |
2016 | } |
2017 | |
2018 | /// Check the provided statement is allowed in a constexpr function |
2019 | /// definition. |
2020 | static bool |
2021 | CheckConstexprFunctionStmt(Sema &SemaRef, const FunctionDecl *Dcl, Stmt *S, |
2022 | SmallVectorImpl<SourceLocation> &ReturnStmts, |
2023 | SourceLocation &Cxx1yLoc, SourceLocation &Cxx2aLoc, |
2024 | Sema::CheckConstexprKind Kind) { |
2025 | // - its function-body shall be [...] a compound-statement that contains only |
2026 | switch (S->getStmtClass()) { |
2027 | case Stmt::NullStmtClass: |
2028 | // - null statements, |
2029 | return true; |
2030 | |
2031 | case Stmt::DeclStmtClass: |
2032 | // - static_assert-declarations |
2033 | // - using-declarations, |
2034 | // - using-directives, |
2035 | // - typedef declarations and alias-declarations that do not define |
2036 | // classes or enumerations, |
2037 | if (!CheckConstexprDeclStmt(SemaRef, Dcl, cast<DeclStmt>(S), Cxx1yLoc, Kind)) |
2038 | return false; |
2039 | return true; |
2040 | |
2041 | case Stmt::ReturnStmtClass: |
2042 | // - and exactly one return statement; |
2043 | if (isa<CXXConstructorDecl>(Dcl)) { |
2044 | // C++1y allows return statements in constexpr constructors. |
2045 | if (!Cxx1yLoc.isValid()) |
2046 | Cxx1yLoc = S->getBeginLoc(); |
2047 | return true; |
2048 | } |
2049 | |
2050 | ReturnStmts.push_back(S->getBeginLoc()); |
2051 | return true; |
2052 | |
2053 | case Stmt::CompoundStmtClass: { |
2054 | // C++1y allows compound-statements. |
2055 | if (!Cxx1yLoc.isValid()) |
2056 | Cxx1yLoc = S->getBeginLoc(); |
2057 | |
2058 | CompoundStmt *CompStmt = cast<CompoundStmt>(S); |
2059 | for (auto *BodyIt : CompStmt->body()) { |
2060 | if (!CheckConstexprFunctionStmt(SemaRef, Dcl, BodyIt, ReturnStmts, |
2061 | Cxx1yLoc, Cxx2aLoc, Kind)) |
2062 | return false; |
2063 | } |
2064 | return true; |
2065 | } |
2066 | |
2067 | case Stmt::AttributedStmtClass: |
2068 | if (!Cxx1yLoc.isValid()) |
2069 | Cxx1yLoc = S->getBeginLoc(); |
2070 | return true; |
2071 | |
2072 | case Stmt::IfStmtClass: { |
2073 | // C++1y allows if-statements. |
2074 | if (!Cxx1yLoc.isValid()) |
2075 | Cxx1yLoc = S->getBeginLoc(); |
2076 | |
2077 | IfStmt *If = cast<IfStmt>(S); |
2078 | if (!CheckConstexprFunctionStmt(SemaRef, Dcl, If->getThen(), ReturnStmts, |
2079 | Cxx1yLoc, Cxx2aLoc, Kind)) |
2080 | return false; |
2081 | if (If->getElse() && |
2082 | !CheckConstexprFunctionStmt(SemaRef, Dcl, If->getElse(), ReturnStmts, |
2083 | Cxx1yLoc, Cxx2aLoc, Kind)) |
2084 | return false; |
2085 | return true; |
2086 | } |
2087 | |
2088 | case Stmt::WhileStmtClass: |
2089 | case Stmt::DoStmtClass: |
2090 | case Stmt::ForStmtClass: |
2091 | case Stmt::CXXForRangeStmtClass: |
2092 | case Stmt::ContinueStmtClass: |
2093 | // C++1y allows all of these. We don't allow them as extensions in C++11, |
2094 | // because they don't make sense without variable mutation. |
2095 | if (!SemaRef.getLangOpts().CPlusPlus14) |
2096 | break; |
2097 | if (!Cxx1yLoc.isValid()) |
2098 | Cxx1yLoc = S->getBeginLoc(); |
2099 | for (Stmt *SubStmt : S->children()) |
2100 | if (SubStmt && |
2101 | !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts, |
2102 | Cxx1yLoc, Cxx2aLoc, Kind)) |
2103 | return false; |
2104 | return true; |
2105 | |
2106 | case Stmt::SwitchStmtClass: |
2107 | case Stmt::CaseStmtClass: |
2108 | case Stmt::DefaultStmtClass: |
2109 | case Stmt::BreakStmtClass: |
2110 | // C++1y allows switch-statements, and since they don't need variable |
2111 | // mutation, we can reasonably allow them in C++11 as an extension. |
2112 | if (!Cxx1yLoc.isValid()) |
2113 | Cxx1yLoc = S->getBeginLoc(); |
2114 | for (Stmt *SubStmt : S->children()) |
2115 | if (SubStmt && |
2116 | !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts, |
2117 | Cxx1yLoc, Cxx2aLoc, Kind)) |
2118 | return false; |
2119 | return true; |
2120 | |
2121 | case Stmt::GCCAsmStmtClass: |
2122 | case Stmt::MSAsmStmtClass: |
2123 | // C++2a allows inline assembly statements. |
2124 | case Stmt::CXXTryStmtClass: |
2125 | if (Cxx2aLoc.isInvalid()) |
2126 | Cxx2aLoc = S->getBeginLoc(); |
2127 | for (Stmt *SubStmt : S->children()) { |
2128 | if (SubStmt && |
2129 | !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts, |
2130 | Cxx1yLoc, Cxx2aLoc, Kind)) |
2131 | return false; |
2132 | } |
2133 | return true; |
2134 | |
2135 | case Stmt::CXXCatchStmtClass: |
2136 | // Do not bother checking the language mode (already covered by the |
2137 | // try block check). |
2138 | if (!CheckConstexprFunctionStmt(SemaRef, Dcl, |
2139 | cast<CXXCatchStmt>(S)->getHandlerBlock(), |
2140 | ReturnStmts, Cxx1yLoc, Cxx2aLoc, Kind)) |
2141 | return false; |
2142 | return true; |
2143 | |
2144 | default: |
2145 | if (!isa<Expr>(S)) |
2146 | break; |
2147 | |
2148 | // C++1y allows expression-statements. |
2149 | if (!Cxx1yLoc.isValid()) |
2150 | Cxx1yLoc = S->getBeginLoc(); |
2151 | return true; |
2152 | } |
2153 | |
2154 | if (Kind == Sema::CheckConstexprKind::Diagnose) { |
2155 | SemaRef.Diag(S->getBeginLoc(), diag::err_constexpr_body_invalid_stmt) |
2156 | << isa<CXXConstructorDecl>(Dcl) << Dcl->isConsteval(); |
2157 | } |
2158 | return false; |
2159 | } |
2160 | |
2161 | /// Check the body for the given constexpr function declaration only contains |
2162 | /// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. |
2163 | /// |
2164 | /// \return true if the body is OK, false if we have found or diagnosed a |
2165 | /// problem. |
2166 | static bool CheckConstexprFunctionBody(Sema &SemaRef, const FunctionDecl *Dcl, |
2167 | Stmt *Body, |
2168 | Sema::CheckConstexprKind Kind) { |
2169 | SmallVector<SourceLocation, 4> ReturnStmts; |
2170 | |
2171 | if (isa<CXXTryStmt>(Body)) { |
2172 | // C++11 [dcl.constexpr]p3: |
2173 | // The definition of a constexpr function shall satisfy the following |
2174 | // constraints: [...] |
2175 | // - its function-body shall be = delete, = default, or a |
2176 | // compound-statement |
2177 | // |
2178 | // C++11 [dcl.constexpr]p4: |
2179 | // In the definition of a constexpr constructor, [...] |
2180 | // - its function-body shall not be a function-try-block; |
2181 | // |
2182 | // This restriction is lifted in C++2a, as long as inner statements also |
2183 | // apply the general constexpr rules. |
2184 | switch (Kind) { |
2185 | case Sema::CheckConstexprKind::CheckValid: |
2186 | if (!SemaRef.getLangOpts().CPlusPlus20) |
2187 | return false; |
2188 | break; |
2189 | |
2190 | case Sema::CheckConstexprKind::Diagnose: |
2191 | SemaRef.Diag(Body->getBeginLoc(), |
2192 | !SemaRef.getLangOpts().CPlusPlus20 |
2193 | ? diag::ext_constexpr_function_try_block_cxx20 |
2194 | : diag::warn_cxx17_compat_constexpr_function_try_block) |
2195 | << isa<CXXConstructorDecl>(Dcl); |
2196 | break; |
2197 | } |
2198 | } |
2199 | |
2200 | // - its function-body shall be [...] a compound-statement that contains only |
2201 | // [... list of cases ...] |
2202 | // |
2203 | // Note that walking the children here is enough to properly check for |
2204 | // CompoundStmt and CXXTryStmt body. |
2205 | SourceLocation Cxx1yLoc, Cxx2aLoc; |
2206 | for (Stmt *SubStmt : Body->children()) { |
2207 | if (SubStmt && |
2208 | !CheckConstexprFunctionStmt(SemaRef, Dcl, SubStmt, ReturnStmts, |
2209 | Cxx1yLoc, Cxx2aLoc, Kind)) |
2210 | return false; |
2211 | } |
2212 | |
2213 | if (Kind == Sema::CheckConstexprKind::CheckValid) { |
2214 | // If this is only valid as an extension, report that we don't satisfy the |
2215 | // constraints of the current language. |
2216 | if ((Cxx2aLoc.isValid() && !SemaRef.getLangOpts().CPlusPlus20) || |
2217 | (Cxx1yLoc.isValid() && !SemaRef.getLangOpts().CPlusPlus17)) |
2218 | return false; |
2219 | } else if (Cxx2aLoc.isValid()) { |
2220 | SemaRef.Diag(Cxx2aLoc, |
2221 | SemaRef.getLangOpts().CPlusPlus20 |
2222 | ? diag::warn_cxx17_compat_constexpr_body_invalid_stmt |
2223 | : diag::ext_constexpr_body_invalid_stmt_cxx20) |
2224 | << isa<CXXConstructorDecl>(Dcl); |
2225 | } else if (Cxx1yLoc.isValid()) { |
2226 | SemaRef.Diag(Cxx1yLoc, |
2227 | SemaRef.getLangOpts().CPlusPlus14 |
2228 | ? diag::warn_cxx11_compat_constexpr_body_invalid_stmt |
2229 | : diag::ext_constexpr_body_invalid_stmt) |
2230 | << isa<CXXConstructorDecl>(Dcl); |
2231 | } |
2232 | |
2233 | if (const CXXConstructorDecl *Constructor |
2234 | = dyn_cast<CXXConstructorDecl>(Dcl)) { |
2235 | const CXXRecordDecl *RD = Constructor->getParent(); |
2236 | // DR1359: |
2237 | // - every non-variant non-static data member and base class sub-object |
2238 | // shall be initialized; |
2239 | // DR1460: |
2240 | // - if the class is a union having variant members, exactly one of them |
2241 | // shall be initialized; |
2242 | if (RD->isUnion()) { |
2243 | if (Constructor->getNumCtorInitializers() == 0 && |
2244 | RD->hasVariantMembers()) { |
2245 | if (Kind == Sema::CheckConstexprKind::Diagnose) { |
2246 | SemaRef.Diag( |
2247 | Dcl->getLocation(), |
2248 | SemaRef.getLangOpts().CPlusPlus20 |
2249 | ? diag::warn_cxx17_compat_constexpr_union_ctor_no_init |
2250 | : diag::ext_constexpr_union_ctor_no_init); |
2251 | } else if (!SemaRef.getLangOpts().CPlusPlus20) { |
2252 | return false; |
2253 | } |
2254 | } |
2255 | } else if (!Constructor->isDependentContext() && |
2256 | !Constructor->isDelegatingConstructor()) { |
2257 | assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases")((void)0); |
2258 | |
2259 | // Skip detailed checking if we have enough initializers, and we would |
2260 | // allow at most one initializer per member. |
2261 | bool AnyAnonStructUnionMembers = false; |
2262 | unsigned Fields = 0; |
2263 | for (CXXRecordDecl::field_iterator I = RD->field_begin(), |
2264 | E = RD->field_end(); I != E; ++I, ++Fields) { |
2265 | if (I->isAnonymousStructOrUnion()) { |
2266 | AnyAnonStructUnionMembers = true; |
2267 | break; |
2268 | } |
2269 | } |
2270 | // DR1460: |
2271 | // - if the class is a union-like class, but is not a union, for each of |
2272 | // its anonymous union members having variant members, exactly one of |
2273 | // them shall be initialized; |
2274 | if (AnyAnonStructUnionMembers || |
2275 | Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { |
2276 | // Check initialization of non-static data members. Base classes are |
2277 | // always initialized so do not need to be checked. Dependent bases |
2278 | // might not have initializers in the member initializer list. |
2279 | llvm::SmallSet<Decl*, 16> Inits; |
2280 | for (const auto *I: Constructor->inits()) { |
2281 | if (FieldDecl *FD = I->getMember()) |
2282 | Inits.insert(FD); |
2283 | else if (IndirectFieldDecl *ID = I->getIndirectMember()) |
2284 | Inits.insert(ID->chain_begin(), ID->chain_end()); |
2285 | } |
2286 | |
2287 | bool Diagnosed = false; |
2288 | for (auto *I : RD->fields()) |
2289 | if (!CheckConstexprCtorInitializer(SemaRef, Dcl, I, Inits, Diagnosed, |
2290 | Kind)) |
2291 | return false; |
2292 | } |
2293 | } |
2294 | } else { |
2295 | if (ReturnStmts.empty()) { |
2296 | // C++1y doesn't require constexpr functions to contain a 'return' |
2297 | // statement. We still do, unless the return type might be void, because |
2298 | // otherwise if there's no return statement, the function cannot |
2299 | // be used in a core constant expression. |
2300 | bool OK = SemaRef.getLangOpts().CPlusPlus14 && |
2301 | (Dcl->getReturnType()->isVoidType() || |
2302 | Dcl->getReturnType()->isDependentType()); |
2303 | switch (Kind) { |
2304 | case Sema::CheckConstexprKind::Diagnose: |
2305 | SemaRef.Diag(Dcl->getLocation(), |
2306 | OK ? diag::warn_cxx11_compat_constexpr_body_no_return |
2307 | : diag::err_constexpr_body_no_return) |
2308 | << Dcl->isConsteval(); |
2309 | if (!OK) |
2310 | return false; |
2311 | break; |
2312 | |
2313 | case Sema::CheckConstexprKind::CheckValid: |
2314 | // The formal requirements don't include this rule in C++14, even |
2315 | // though the "must be able to produce a constant expression" rules |
2316 | // still imply it in some cases. |
2317 | if (!SemaRef.getLangOpts().CPlusPlus14) |
2318 | return false; |
2319 | break; |
2320 | } |
2321 | } else if (ReturnStmts.size() > 1) { |
2322 | switch (Kind) { |
2323 | case Sema::CheckConstexprKind::Diagnose: |
2324 | SemaRef.Diag( |
2325 | ReturnStmts.back(), |
2326 | SemaRef.getLangOpts().CPlusPlus14 |
2327 | ? diag::warn_cxx11_compat_constexpr_body_multiple_return |
2328 | : diag::ext_constexpr_body_multiple_return); |
2329 | for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) |
2330 | SemaRef.Diag(ReturnStmts[I], |
2331 | diag::note_constexpr_body_previous_return); |
2332 | break; |
2333 | |
2334 | case Sema::CheckConstexprKind::CheckValid: |
2335 | if (!SemaRef.getLangOpts().CPlusPlus14) |
2336 | return false; |
2337 | break; |
2338 | } |
2339 | } |
2340 | } |
2341 | |
2342 | // C++11 [dcl.constexpr]p5: |
2343 | // if no function argument values exist such that the function invocation |
2344 | // substitution would produce a constant expression, the program is |
2345 | // ill-formed; no diagnostic required. |
2346 | // C++11 [dcl.constexpr]p3: |
2347 | // - every constructor call and implicit conversion used in initializing the |
2348 | // return value shall be one of those allowed in a constant expression. |
2349 | // C++11 [dcl.constexpr]p4: |
2350 | // - every constructor involved in initializing non-static data members and |
2351 | // base class sub-objects shall be a constexpr constructor. |
2352 | // |
2353 | // Note that this rule is distinct from the "requirements for a constexpr |
2354 | // function", so is not checked in CheckValid mode. |
2355 | SmallVector<PartialDiagnosticAt, 8> Diags; |
2356 | if (Kind == Sema::CheckConstexprKind::Diagnose && |
2357 | !Expr::isPotentialConstantExpr(Dcl, Diags)) { |
2358 | SemaRef.Diag(Dcl->getLocation(), |
2359 | diag::ext_constexpr_function_never_constant_expr) |
2360 | << isa<CXXConstructorDecl>(Dcl) << Dcl->isConsteval(); |
2361 | for (size_t I = 0, N = Diags.size(); I != N; ++I) |
2362 | SemaRef.Diag(Diags[I].first, Diags[I].second); |
2363 | // Don't return false here: we allow this for compatibility in |
2364 | // system headers. |
2365 | } |
2366 | |
2367 | return true; |
2368 | } |
2369 | |
2370 | /// Get the class that is directly named by the current context. This is the |
2371 | /// class for which an unqualified-id in this scope could name a constructor |
2372 | /// or destructor. |
2373 | /// |
2374 | /// If the scope specifier denotes a class, this will be that class. |
2375 | /// If the scope specifier is empty, this will be the class whose |
2376 | /// member-specification we are currently within. Otherwise, there |
2377 | /// is no such class. |
2378 | CXXRecordDecl *Sema::getCurrentClass(Scope *, const CXXScopeSpec *SS) { |
2379 | assert(getLangOpts().CPlusPlus && "No class names in C!")((void)0); |
2380 | |
2381 | if (SS && SS->isInvalid()) |
2382 | return nullptr; |
2383 | |
2384 | if (SS && SS->isNotEmpty()) { |
2385 | DeclContext *DC = computeDeclContext(*SS, true); |
2386 | return dyn_cast_or_null<CXXRecordDecl>(DC); |
2387 | } |
2388 | |
2389 | return dyn_cast_or_null<CXXRecordDecl>(CurContext); |
2390 | } |
2391 | |
2392 | /// isCurrentClassName - Determine whether the identifier II is the |
2393 | /// name of the class type currently being defined. In the case of |
2394 | /// nested classes, this will only return true if II is the name of |
2395 | /// the innermost class. |
2396 | bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *S, |
2397 | const CXXScopeSpec *SS) { |
2398 | CXXRecordDecl *CurDecl = getCurrentClass(S, SS); |
2399 | return CurDecl && &II == CurDecl->getIdentifier(); |
2400 | } |
2401 | |
2402 | /// Determine whether the identifier II is a typo for the name of |
2403 | /// the class type currently being defined. If so, update it to the identifier |
2404 | /// that should have been used. |
2405 | bool Sema::isCurrentClassNameTypo(IdentifierInfo *&II, const CXXScopeSpec *SS) { |
2406 | assert(getLangOpts().CPlusPlus && "No class names in C!")((void)0); |
2407 | |
2408 | if (!getLangOpts().SpellChecking) |
2409 | return false; |
2410 | |
2411 | CXXRecordDecl *CurDecl; |
2412 | if (SS && SS->isSet() && !SS->isInvalid()) { |
2413 | DeclContext *DC = computeDeclContext(*SS, true); |
2414 | CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); |
2415 | } else |
2416 | CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); |
2417 | |
2418 | if (CurDecl && CurDecl->getIdentifier() && II != CurDecl->getIdentifier() && |
2419 | 3 * II->getName().edit_distance(CurDecl->getIdentifier()->getName()) |
2420 | < II->getLength()) { |
2421 | II = CurDecl->getIdentifier(); |
2422 | return true; |
2423 | } |
2424 | |
2425 | return false; |
2426 | } |
2427 | |
2428 | /// Determine whether the given class is a base class of the given |
2429 | /// class, including looking at dependent bases. |
2430 | static bool findCircularInheritance(const CXXRecordDecl *Class, |
2431 | const CXXRecordDecl *Current) { |
2432 | SmallVector<const CXXRecordDecl*, 8> Queue; |
2433 | |
2434 | Class = Class->getCanonicalDecl(); |
2435 | while (true) { |
2436 | for (const auto &I : Current->bases()) { |
2437 | CXXRecordDecl *Base = I.getType()->getAsCXXRecordDecl(); |
2438 | if (!Base) |
2439 | continue; |
2440 | |
2441 | Base = Base->getDefinition(); |
2442 | if (!Base) |
2443 | continue; |
2444 | |
2445 | if (Base->getCanonicalDecl() == Class) |
2446 | return true; |
2447 | |
2448 | Queue.push_back(Base); |
2449 | } |
2450 | |
2451 | if (Queue.empty()) |
2452 | return false; |
2453 | |
2454 | Current = Queue.pop_back_val(); |
2455 | } |
2456 | |
2457 | return false; |
2458 | } |
2459 | |
2460 | /// Check the validity of a C++ base class specifier. |
2461 | /// |
2462 | /// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics |
2463 | /// and returns NULL otherwise. |
2464 | CXXBaseSpecifier * |
2465 | Sema::CheckBaseSpecifier(CXXRecordDecl *Class, |
2466 | SourceRange SpecifierRange, |
2467 | bool Virtual, AccessSpecifier Access, |
2468 | TypeSourceInfo *TInfo, |
2469 | SourceLocation EllipsisLoc) { |
2470 | QualType BaseType = TInfo->getType(); |
2471 | if (BaseType->containsErrors()) { |
2472 | // Already emitted a diagnostic when parsing the error type. |
2473 | return nullptr; |
2474 | } |
2475 | // C++ [class.union]p1: |
2476 | // A union shall not have base classes. |
2477 | if (Class->isUnion()) { |
2478 | Diag(Class->getLocation(), diag::err_base_clause_on_union) |
2479 | << SpecifierRange; |
2480 | return nullptr; |
2481 | } |
2482 | |
2483 | if (EllipsisLoc.isValid() && |
2484 | !TInfo->getType()->containsUnexpandedParameterPack()) { |
2485 | Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) |
2486 | << TInfo->getTypeLoc().getSourceRange(); |
2487 | EllipsisLoc = SourceLocation(); |
2488 | } |
2489 | |
2490 | SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); |
2491 | |
2492 | if (BaseType->isDependentType()) { |
2493 | // Make sure that we don't have circular inheritance among our dependent |
2494 | // bases. For non-dependent bases, the check for completeness below handles |
2495 | // this. |
2496 | if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) { |
2497 | if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() || |
2498 | ((BaseDecl = BaseDecl->getDefinition()) && |
2499 | findCircularInheritance(Class, BaseDecl))) { |
2500 | Diag(BaseLoc, diag::err_circular_inheritance) |
2501 | << BaseType << Context.getTypeDeclType(Class); |
2502 | |
2503 | if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl()) |
2504 | Diag(BaseDecl->getLocation(), diag::note_previous_decl) |
2505 | << BaseType; |
2506 | |
2507 | return nullptr; |
2508 | } |
2509 | } |
2510 | |
2511 | // Make sure that we don't make an ill-formed AST where the type of the |
2512 | // Class is non-dependent and its attached base class specifier is an |
2513 | // dependent type, which violates invariants in many clang code paths (e.g. |
2514 | // constexpr evaluator). If this case happens (in errory-recovery mode), we |
2515 | // explicitly mark the Class decl invalid. The diagnostic was already |
2516 | // emitted. |
2517 | if (!Class->getTypeForDecl()->isDependentType()) |
2518 | Class->setInvalidDecl(); |
2519 | return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, |
2520 | Class->getTagKind() == TTK_Class, |
2521 | Access, TInfo, EllipsisLoc); |
2522 | } |
2523 | |
2524 | // Base specifiers must be record types. |
2525 | if (!BaseType->isRecordType()) { |
2526 | Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; |
2527 | return nullptr; |
2528 | } |
2529 | |
2530 | // C++ [class.union]p1: |
2531 | // A union shall not be used as a base class. |
2532 | if (BaseType->isUnionType()) { |
2533 | Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; |
2534 | return nullptr; |
2535 | } |
2536 | |
2537 | // For the MS ABI, propagate DLL attributes to base class templates. |
2538 | if (Context.getTargetInfo().getCXXABI().isMicrosoft()) { |
2539 | if (Attr *ClassAttr = getDLLAttr(Class)) { |
2540 | if (auto *BaseTemplate = dyn_cast_or_null<ClassTemplateSpecializationDecl>( |
2541 | BaseType->getAsCXXRecordDecl())) { |
2542 | propagateDLLAttrToBaseClassTemplate(Class, ClassAttr, BaseTemplate, |
2543 | BaseLoc); |
2544 | } |
2545 | } |
2546 | } |
2547 | |
2548 | // C++ [class.derived]p2: |
2549 | // The class-name in a base-specifier shall not be an incompletely |
2550 | // defined class. |
2551 | if (RequireCompleteType(BaseLoc, BaseType, |
2552 | diag::err_incomplete_base_class, SpecifierRange)) { |
2553 | Class->setInvalidDecl(); |
2554 | return nullptr; |
2555 | } |
2556 | |
2557 | // If the base class is polymorphic or isn't empty, the new one is/isn't, too. |
2558 | RecordDecl *BaseDecl = BaseType->castAs<RecordType>()->getDecl(); |
2559 | assert(BaseDecl && "Record type has no declaration")((void)0); |
2560 | BaseDecl = BaseDecl->getDefinition(); |
2561 | assert(BaseDecl && "Base type is not incomplete, but has no definition")((void)0); |
2562 | CXXRecordDecl *CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); |
2563 | assert(CXXBaseDecl && "Base type is not a C++ type")((void)0); |
2564 | |
2565 | // Microsoft docs say: |
2566 | // "If a base-class has a code_seg attribute, derived classes must have the |
2567 | // same attribute." |
2568 | const auto *BaseCSA = CXXBaseDecl->getAttr<CodeSegAttr>(); |
2569 | const auto *DerivedCSA = Class->getAttr<CodeSegAttr>(); |
2570 | if ((DerivedCSA || BaseCSA) && |
2571 | (!BaseCSA || !DerivedCSA || BaseCSA->getName() != DerivedCSA->getName())) { |
2572 | Diag(Class->getLocation(), diag::err_mismatched_code_seg_base); |
2573 | Diag(CXXBaseDecl->getLocation(), diag::note_base_class_specified_here) |
2574 | << CXXBaseDecl; |
2575 | return nullptr; |
2576 | } |
2577 | |
2578 | // A class which contains a flexible array member is not suitable for use as a |
2579 | // base class: |
2580 | // - If the layout determines that a base comes before another base, |
2581 | // the flexible array member would index into the subsequent base. |
2582 | // - If the layout determines that base comes before the derived class, |
2583 | // the flexible array member would index into the derived class. |
2584 | if (CXXBaseDecl->hasFlexibleArrayMember()) { |
2585 | Diag(BaseLoc, diag::err_base_class_has_flexible_array_member) |
2586 | << CXXBaseDecl->getDeclName(); |
2587 | return nullptr; |
2588 | } |
2589 | |
2590 | // C++ [class]p3: |
2591 | // If a class is marked final and it appears as a base-type-specifier in |
2592 | // base-clause, the program is ill-formed. |
2593 | if (FinalAttr *FA = CXXBaseDecl->getAttr<FinalAttr>()) { |
2594 | Diag(BaseLoc, diag::err_class_marked_final_used_as_base) |
2595 | << CXXBaseDecl->getDeclName() |
2596 | << FA->isSpelledAsSealed(); |
2597 | Diag(CXXBaseDecl->getLocation(), diag::note_entity_declared_at) |
2598 | << CXXBaseDecl->getDeclName() << FA->getRange(); |
2599 | return nullptr; |
2600 | } |
2601 | |
2602 | if (BaseDecl->isInvalidDecl()) |
2603 | Class->setInvalidDecl(); |
2604 | |
2605 | // Create the base specifier. |
2606 | return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, |
2607 | Class->getTagKind() == TTK_Class, |
2608 | Access, TInfo, EllipsisLoc); |
2609 | } |
2610 | |
2611 | /// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is |
2612 | /// one entry in the base class list of a class specifier, for |
2613 | /// example: |
2614 | /// class foo : public bar, virtual private baz { |
2615 | /// 'public bar' and 'virtual private baz' are each base-specifiers. |
2616 | BaseResult |
2617 | Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, |
2618 | ParsedAttributes &Attributes, |
2619 | bool Virtual, AccessSpecifier Access, |
2620 | ParsedType basetype, SourceLocation BaseLoc, |
2621 | SourceLocation EllipsisLoc) { |
2622 | if (!classdecl) |
2623 | return true; |
2624 | |
2625 | AdjustDeclIfTemplate(classdecl); |
2626 | CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); |
2627 | if (!Class) |
2628 | return true; |
2629 | |
2630 | // We haven't yet attached the base specifiers. |
2631 | Class->setIsParsingBaseSpecifiers(); |
2632 | |
2633 | // We do not support any C++11 attributes on base-specifiers yet. |
2634 | // Diagnose any attributes we see. |
2635 | for (const ParsedAttr &AL : Attributes) { |
2636 | if (AL.isInvalid() || AL.getKind() == ParsedAttr::IgnoredAttribute) |
2637 | continue; |
2638 | Diag(AL.getLoc(), AL.getKind() == ParsedAttr::UnknownAttribute |
2639 | ? (unsigned)diag::warn_unknown_attribute_ignored |
2640 | : (unsigned)diag::err_base_specifier_attribute) |
2641 | << AL << AL.getRange(); |
2642 | } |
2643 | |
2644 | TypeSourceInfo *TInfo = nullptr; |
2645 | GetTypeFromParser(basetype, &TInfo); |
2646 | |
2647 | if (EllipsisLoc.isInvalid() && |
2648 | DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, |
2649 | UPPC_BaseType)) |
2650 | return true; |
2651 | |
2652 | if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, |
2653 | Virtual, Access, TInfo, |
2654 | EllipsisLoc)) |
2655 | return BaseSpec; |
2656 | else |
2657 | Class->setInvalidDecl(); |
2658 | |
2659 | return true; |
2660 | } |
2661 | |
2662 | /// Use small set to collect indirect bases. As this is only used |
2663 | /// locally, there's no need to abstract the small size parameter. |
2664 | typedef llvm::SmallPtrSet<QualType, 4> IndirectBaseSet; |
2665 | |
2666 | /// Recursively add the bases of Type. Don't add Type itself. |
2667 | static void |
2668 | NoteIndirectBases(ASTContext &Context, IndirectBaseSet &Set, |
2669 | const QualType &Type) |
2670 | { |
2671 | // Even though the incoming type is a base, it might not be |
2672 | // a class -- it could be a template parm, for instance. |
2673 | if (auto Rec = Type->getAs<RecordType>()) { |
2674 | auto Decl = Rec->getAsCXXRecordDecl(); |
2675 | |
2676 | // Iterate over its bases. |
2677 | for (const auto &BaseSpec : Decl->bases()) { |
2678 | QualType Base = Context.getCanonicalType(BaseSpec.getType()) |
2679 | .getUnqualifiedType(); |
2680 | if (Set.insert(Base).second) |
2681 | // If we've not already seen it, recurse. |
2682 | NoteIndirectBases(Context, Set, Base); |
2683 | } |
2684 | } |
2685 | } |
2686 | |
2687 | /// Performs the actual work of attaching the given base class |
2688 | /// specifiers to a C++ class. |
2689 | bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, |
2690 | MutableArrayRef<CXXBaseSpecifier *> Bases) { |
2691 | if (Bases.empty()) |
2692 | return false; |
2693 | |
2694 | // Used to keep track of which base types we have already seen, so |
2695 | // that we can properly diagnose redundant direct base types. Note |
2696 | // that the key is always the unqualified canonical type of the base |
2697 | // class. |
2698 | std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; |
2699 | |
2700 | // Used to track indirect bases so we can see if a direct base is |
2701 | // ambiguous. |
2702 | IndirectBaseSet IndirectBaseTypes; |
2703 | |
2704 | // Copy non-redundant base specifiers into permanent storage. |
2705 | unsigned NumGoodBases = 0; |
2706 | bool Invalid = false; |
2707 | for (unsigned idx = 0; idx < Bases.size(); ++idx) { |
2708 | QualType NewBaseType |
2709 | = Context.getCanonicalType(Bases[idx]->getType()); |
2710 | NewBaseType = NewBaseType.getLocalUnqualifiedType(); |
2711 | |
2712 | CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; |
2713 | if (KnownBase) { |
2714 | // C++ [class.mi]p3: |
2715 | // A class shall not be specified as a direct base class of a |
2716 | // derived class more than once. |
2717 | Diag(Bases[idx]->getBeginLoc(), diag::err_duplicate_base_class) |
2718 | << KnownBase->getType() << Bases[idx]->getSourceRange(); |
2719 | |
2720 | // Delete the duplicate base class specifier; we're going to |
2721 | // overwrite its pointer later. |
2722 | Context.Deallocate(Bases[idx]); |
2723 | |
2724 | Invalid = true; |
2725 | } else { |
2726 | // Okay, add this new base class. |
2727 | KnownBase = Bases[idx]; |
2728 | Bases[NumGoodBases++] = Bases[idx]; |
2729 | |
2730 | // Note this base's direct & indirect bases, if there could be ambiguity. |
2731 | if (Bases.size() > 1) |
2732 | NoteIndirectBases(Context, IndirectBaseTypes, NewBaseType); |
2733 | |
2734 | if (const RecordType *Record = NewBaseType->getAs<RecordType>()) { |
2735 | const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); |
2736 | if (Class->isInterface() && |
2737 | (!RD->isInterfaceLike() || |
2738 | KnownBase->getAccessSpecifier() != AS_public)) { |
2739 | // The Microsoft extension __interface does not permit bases that |
2740 | // are not themselves public interfaces. |
2741 | Diag(KnownBase->getBeginLoc(), diag::err_invalid_base_in_interface) |
2742 | << getRecordDiagFromTagKind(RD->getTagKind()) << RD |
2743 | << RD->getSourceRange(); |
2744 | Invalid = true; |
2745 | } |
2746 | if (RD->hasAttr<WeakAttr>()) |
2747 | Class->addAttr(WeakAttr::CreateImplicit(Context)); |
2748 | } |
2749 | } |
2750 | } |
2751 | |
2752 | // Attach the remaining base class specifiers to the derived class. |
2753 | Class->setBases(Bases.data(), NumGoodBases); |
2754 | |
2755 | // Check that the only base classes that are duplicate are virtual. |
2756 | for (unsigned idx = 0; idx < NumGoodBases; ++idx) { |
2757 | // Check whether this direct base is inaccessible due to ambiguity. |
2758 | QualType BaseType = Bases[idx]->getType(); |
2759 | |
2760 | // Skip all dependent types in templates being used as base specifiers. |
2761 | // Checks below assume that the base specifier is a CXXRecord. |
2762 | if (BaseType->isDependentType()) |
2763 | continue; |
2764 | |
2765 | CanQualType CanonicalBase = Context.getCanonicalType(BaseType) |
2766 | .getUnqualifiedType(); |
2767 | |
2768 | if (IndirectBaseTypes.count(CanonicalBase)) { |
2769 | CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, |
2770 | /*DetectVirtual=*/true); |
2771 | bool found |
2772 | = Class->isDerivedFrom(CanonicalBase->getAsCXXRecordDecl(), Paths); |
2773 | assert(found)((void)0); |
2774 | (void)found; |
2775 | |
2776 | if (Paths.isAmbiguous(CanonicalBase)) |
2777 | Diag(Bases[idx]->getBeginLoc(), diag::warn_inaccessible_base_class) |
2778 | << BaseType << getAmbiguousPathsDisplayString(Paths) |
2779 | << Bases[idx]->getSourceRange(); |
2780 | else |
2781 | assert(Bases[idx]->isVirtual())((void)0); |
2782 | } |
2783 | |
2784 | // Delete the base class specifier, since its data has been copied |
2785 | // into the CXXRecordDecl. |
2786 | Context.Deallocate(Bases[idx]); |
2787 | } |
2788 | |
2789 | return Invalid; |
2790 | } |
2791 | |
2792 | /// ActOnBaseSpecifiers - Attach the given base specifiers to the |
2793 | /// class, after checking whether there are any duplicate base |
2794 | /// classes. |
2795 | void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, |
2796 | MutableArrayRef<CXXBaseSpecifier *> Bases) { |
2797 | if (!ClassDecl || Bases.empty()) |
2798 | return; |
2799 | |
2800 | AdjustDeclIfTemplate(ClassDecl); |
2801 | AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), Bases); |
2802 | } |
2803 | |
2804 | /// Determine whether the type \p Derived is a C++ class that is |
2805 | /// derived from the type \p Base. |
2806 | bool Sema::IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base) { |
2807 | if (!getLangOpts().CPlusPlus) |
2808 | return false; |
2809 | |
2810 | CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); |
2811 | if (!DerivedRD) |
2812 | return false; |
2813 | |
2814 | CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); |
2815 | if (!BaseRD) |
2816 | return false; |
2817 | |
2818 | // If either the base or the derived type is invalid, don't try to |
2819 | // check whether one is derived from the other. |
2820 | if (BaseRD->isInvalidDecl() || DerivedRD->isInvalidDecl()) |
2821 | return false; |
2822 | |
2823 | // FIXME: In a modules build, do we need the entire path to be visible for us |
2824 | // to be able to use the inheritance relationship? |
2825 | if (!isCompleteType(Loc, Derived) && !DerivedRD->isBeingDefined()) |
2826 | return false; |
2827 | |
2828 | return DerivedRD->isDerivedFrom(BaseRD); |
2829 | } |
2830 | |
2831 | /// Determine whether the type \p Derived is a C++ class that is |
2832 | /// derived from the type \p Base. |
2833 | bool Sema::IsDerivedFrom(SourceLocation Loc, QualType Derived, QualType Base, |
2834 | CXXBasePaths &Paths) { |
2835 | if (!getLangOpts().CPlusPlus) |
2836 | return false; |
2837 | |
2838 | CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); |
2839 | if (!DerivedRD) |
2840 | return false; |
2841 | |
2842 | CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); |
2843 | if (!BaseRD) |
2844 | return false; |
2845 | |
2846 | if (!isCompleteType(Loc, Derived) && !DerivedRD->isBeingDefined()) |
2847 | return false; |
2848 | |
2849 | return DerivedRD->isDerivedFrom(BaseRD, Paths); |
2850 | } |
2851 | |
2852 | static void BuildBasePathArray(const CXXBasePath &Path, |
2853 | CXXCastPath &BasePathArray) { |
2854 | // We first go backward and check if we have a virtual base. |
2855 | // FIXME: It would be better if CXXBasePath had the base specifier for |
2856 | // the nearest virtual base. |
2857 | unsigned Start = 0; |
2858 | for (unsigned I = Path.size(); I != 0; --I) { |
2859 | if (Path[I - 1].Base->isVirtual()) { |
2860 | Start = I - 1; |
2861 | break; |
2862 | } |
2863 | } |
2864 | |
2865 | // Now add all bases. |
2866 | for (unsigned I = Start, E = Path.size(); I != E; ++I) |
2867 | BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); |
2868 | } |
2869 | |
2870 | |
2871 | void Sema::BuildBasePathArray(const CXXBasePaths &Paths, |
2872 | CXXCastPath &BasePathArray) { |
2873 | assert(BasePathArray.empty() && "Base path array must be empty!")((void)0); |
2874 | assert(Paths.isRecordingPaths() && "Must record paths!")((void)0); |
2875 | return ::BuildBasePathArray(Paths.front(), BasePathArray); |
2876 | } |
2877 | /// CheckDerivedToBaseConversion - Check whether the Derived-to-Base |
2878 | /// conversion (where Derived and Base are class types) is |
2879 | /// well-formed, meaning that the conversion is unambiguous (and |
2880 | /// that all of the base classes are accessible). Returns true |
2881 | /// and emits a diagnostic if the code is ill-formed, returns false |
2882 | /// otherwise. Loc is the location where this routine should point to |
2883 | /// if there is an error, and Range is the source range to highlight |
2884 | /// if there is an error. |
2885 | /// |
2886 | /// If either InaccessibleBaseID or AmbiguousBaseConvID are 0, then the |
2887 | /// diagnostic for the respective type of error will be suppressed, but the |
2888 | /// check for ill-formed code will still be performed. |
2889 | bool |
2890 | Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, |
2891 | unsigned InaccessibleBaseID, |
2892 | unsigned AmbiguousBaseConvID, |
2893 | SourceLocation Loc, SourceRange Range, |
2894 | DeclarationName Name, |
2895 | CXXCastPath *BasePath, |
2896 | bool IgnoreAccess) { |
2897 | // First, determine whether the path from Derived to Base is |
2898 | // ambiguous. This is slightly more expensive than checking whether |
2899 | // the Derived to Base conversion exists, because here we need to |
2900 | // explore multiple paths to determine if there is an ambiguity. |
2901 | CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, |
2902 | /*DetectVirtual=*/false); |
2903 | bool DerivationOkay = IsDerivedFrom(Loc, Derived, Base, Paths); |
2904 | if (!DerivationOkay) |
2905 | return true; |
2906 | |
2907 | const CXXBasePath *Path = nullptr; |
2908 | if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) |
2909 | Path = &Paths.front(); |
2910 | |
2911 | // For MSVC compatibility, check if Derived directly inherits from Base. Clang |
2912 | // warns about this hierarchy under -Winaccessible-base, but MSVC allows the |
2913 | // user to access such bases. |
2914 | if (!Path && getLangOpts().MSVCCompat) { |
2915 | for (const CXXBasePath &PossiblePath : Paths) { |
2916 | if (PossiblePath.size() == 1) { |
2917 | Path = &PossiblePath; |
2918 | if (AmbiguousBaseConvID) |
2919 | Diag(Loc, diag::ext_ms_ambiguous_direct_base) |
2920 | << Base << Derived << Range; |
2921 | break; |
2922 | } |
2923 | } |
2924 | } |
2925 | |
2926 | if (Path) { |
2927 | if (!IgnoreAccess) { |
2928 | // Check that the base class can be accessed. |
2929 | switch ( |
2930 | CheckBaseClassAccess(Loc, Base, Derived, *Path, InaccessibleBaseID)) { |
2931 | case AR_inaccessible: |
2932 | return true; |
2933 | case AR_accessible: |
2934 | case AR_dependent: |
2935 | case AR_delayed: |
2936 | break; |
2937 | } |
2938 | } |
2939 | |
2940 | // Build a base path if necessary. |
2941 | if (BasePath) |
2942 | ::BuildBasePathArray(*Path, *BasePath); |
2943 | return false; |
2944 | } |
2945 | |
2946 | if (AmbiguousBaseConvID) { |
2947 | // We know that the derived-to-base conversion is ambiguous, and |
2948 | // we're going to produce a diagnostic. Perform the derived-to-base |
2949 | // search just one more time to compute all of the possible paths so |
2950 | // that we can print them out. This is more expensive than any of |
2951 | // the previous derived-to-base checks we've done, but at this point |
2952 | // performance isn't as much of an issue. |
2953 | Paths.clear(); |
2954 | Paths.setRecordingPaths(true); |
2955 | bool StillOkay = IsDerivedFrom(Loc, Derived, Base, Paths); |
2956 | assert(StillOkay && "Can only be used with a derived-to-base conversion")((void)0); |
2957 | (void)StillOkay; |
2958 | |
2959 | // Build up a textual representation of the ambiguous paths, e.g., |
2960 | // D -> B -> A, that will be used to illustrate the ambiguous |
2961 | // conversions in the diagnostic. We only print one of the paths |
2962 | // to each base class subobject. |
2963 | std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); |
2964 | |
2965 | Diag(Loc, AmbiguousBaseConvID) |
2966 | << Derived << Base << PathDisplayStr << Range << Name; |
2967 | } |
2968 | return true; |
2969 | } |
2970 | |
2971 | bool |
2972 | Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, |
2973 | SourceLocation Loc, SourceRange Range, |
2974 | CXXCastPath *BasePath, |
2975 | bool IgnoreAccess) { |
2976 | return CheckDerivedToBaseConversion( |
2977 | Derived, Base, diag::err_upcast_to_inaccessible_base, |
2978 | diag::err_ambiguous_derived_to_base_conv, Loc, Range, DeclarationName(), |
2979 | BasePath, IgnoreAccess); |
2980 | } |
2981 | |
2982 | |
2983 | /// Builds a string representing ambiguous paths from a |
2984 | /// specific derived class to different subobjects of the same base |
2985 | /// class. |
2986 | /// |
2987 | /// This function builds a string that can be used in error messages |
2988 | /// to show the different paths that one can take through the |
2989 | /// inheritance hierarchy to go from the derived class to different |
2990 | /// subobjects of a base class. The result looks something like this: |
2991 | /// @code |
2992 | /// struct D -> struct B -> struct A |
2993 | /// struct D -> struct C -> struct A |
2994 | /// @endcode |
2995 | std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { |
2996 | std::string PathDisplayStr; |
2997 | std::set<unsigned> DisplayedPaths; |
2998 | for (CXXBasePaths::paths_iterator Path = Paths.begin(); |
2999 | Path != Paths.end(); ++Path) { |
3000 | if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { |
3001 | // We haven't displayed a path to this particular base |
3002 | // class subobject yet. |
3003 | PathDisplayStr += "\n "; |
3004 | PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); |
3005 | for (CXXBasePath::const_iterator Element = Path->begin(); |
3006 | Element != Path->end(); ++Element) |
3007 | PathDisplayStr += " -> " + Element->Base->getType().getAsString(); |
3008 | } |
3009 | } |
3010 | |
3011 | return PathDisplayStr; |
3012 | } |
3013 | |
3014 | //===----------------------------------------------------------------------===// |
3015 | // C++ class member Handling |
3016 | //===----------------------------------------------------------------------===// |
3017 | |
3018 | /// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. |
3019 | bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, SourceLocation ASLoc, |
3020 | SourceLocation ColonLoc, |
3021 | const ParsedAttributesView &Attrs) { |
3022 | assert(Access != AS_none && "Invalid kind for syntactic access specifier!")((void)0); |
3023 | AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, |
3024 | ASLoc, ColonLoc); |
3025 | CurContext->addHiddenDecl(ASDecl); |
3026 | return ProcessAccessDeclAttributeList(ASDecl, Attrs); |
3027 | } |
3028 | |
3029 | /// CheckOverrideControl - Check C++11 override control semantics. |
3030 | void Sema::CheckOverrideControl(NamedDecl *D) { |
3031 | if (D->isInvalidDecl()) |
3032 | return; |
3033 | |
3034 | // We only care about "override" and "final" declarations. |
3035 | if (!D->hasAttr<OverrideAttr>() && !D->hasAttr<FinalAttr>()) |
3036 | return; |
3037 | |
3038 | CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); |
3039 | |
3040 | // We can't check dependent instance methods. |
3041 | if (MD && MD->isInstance() && |
3042 | (MD->getParent()->hasAnyDependentBases() || |
3043 | MD->getType()->isDependentType())) |
3044 | return; |
3045 | |
3046 | if (MD && !MD->isVirtual()) { |
3047 | // If we have a non-virtual method, check if if hides a virtual method. |
3048 | // (In that case, it's most likely the method has the wrong type.) |
3049 | SmallVector<CXXMethodDecl *, 8> OverloadedMethods; |
3050 | FindHiddenVirtualMethods(MD, OverloadedMethods); |
3051 | |
3052 | if (!OverloadedMethods.empty()) { |
3053 | if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { |
3054 | Diag(OA->getLocation(), |
3055 | diag::override_keyword_hides_virtual_member_function) |
3056 | << "override" << (OverloadedMethods.size() > 1); |
3057 | } else if (FinalAttr *FA = D->getAttr<FinalAttr>()) { |
3058 | Diag(FA->getLocation(), |
3059 | diag::override_keyword_hides_virtual_member_function) |
3060 | << (FA->isSpelledAsSealed() ? "sealed" : "final") |
3061 | << (OverloadedMethods.size() > 1); |
3062 | } |
3063 | NoteHiddenVirtualMethods(MD, OverloadedMethods); |
3064 | MD->setInvalidDecl(); |
3065 | return; |
3066 | } |
3067 | // Fall through into the general case diagnostic. |
3068 | // FIXME: We might want to attempt typo correction here. |
3069 | } |
3070 | |
3071 | if (!MD || !MD->isVirtual()) { |
3072 | if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { |
3073 | Diag(OA->getLocation(), |
3074 | diag::override_keyword_only_allowed_on_virtual_member_functions) |
3075 | << "override" << FixItHint::CreateRemoval(OA->getLocation()); |
3076 | D->dropAttr<OverrideAttr>(); |
3077 | } |
3078 | if (FinalAttr *FA = D->getAttr<FinalAttr>()) { |
3079 | Diag(FA->getLocation(), |
3080 | diag::override_keyword_only_allowed_on_virtual_member_functions) |
3081 | << (FA->isSpelledAsSealed() ? "sealed" : "final") |
3082 | << FixItHint::CreateRemoval(FA->getLocation()); |
3083 | D->dropAttr<FinalAttr>(); |
3084 | } |
3085 | return; |
3086 | } |
3087 | |
3088 | // C++11 [class.virtual]p5: |
3089 | // If a function is marked with the virt-specifier override and |
3090 | // does not override a member function of a base class, the program is |
3091 | // ill-formed. |
3092 | bool HasOverriddenMethods = MD->size_overridden_methods() != 0; |
3093 | if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) |
3094 | Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) |
3095 | << MD->getDeclName(); |
3096 | } |
3097 | |
3098 | void Sema::DiagnoseAbsenceOfOverrideControl(NamedDecl *D, bool Inconsistent) { |
3099 | if (D->isInvalidDecl() || D->hasAttr<OverrideAttr>()) |
3100 | return; |
3101 | CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); |
3102 | if (!MD || MD->isImplicit() || MD->hasAttr<FinalAttr>()) |
3103 | return; |
3104 | |
3105 | SourceLocation Loc = MD->getLocation(); |
3106 | SourceLocation SpellingLoc = Loc; |
3107 | if (getSourceManager().isMacroArgExpansion(Loc)) |
3108 | SpellingLoc = getSourceManager().getImmediateExpansionRange(Loc).getBegin(); |
3109 | SpellingLoc = getSourceManager().getSpellingLoc(SpellingLoc); |
3110 | if (SpellingLoc.isValid() && getSourceManager().isInSystemHeader(SpellingLoc)) |
3111 | return; |
3112 | |
3113 | if (MD->size_overridden_methods() > 0) { |
3114 | auto EmitDiag = [&](unsigned DiagInconsistent, unsigned DiagSuggest) { |
3115 | unsigned DiagID = |
3116 | Inconsistent && !Diags.isIgnored(DiagInconsistent, MD->getLocation()) |
3117 | ? DiagInconsistent |
3118 | : DiagSuggest; |
3119 | Diag(MD->getLocation(), DiagID) << MD->getDeclName(); |
3120 | const CXXMethodDecl *OMD = *MD->begin_overridden_methods(); |
3121 | Diag(OMD->getLocation(), diag::note_overridden_virtual_function); |
3122 | }; |
3123 | if (isa<CXXDestructorDecl>(MD)) |
3124 | EmitDiag( |
3125 | diag::warn_inconsistent_destructor_marked_not_override_overriding, |
3126 | diag::warn_suggest_destructor_marked_not_override_overriding); |
3127 | else |
3128 | EmitDiag(diag::warn_inconsistent_function_marked_not_override_overriding, |
3129 | diag::warn_suggest_function_marked_not_override_overriding); |
3130 | } |
3131 | } |
3132 | |
3133 | /// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member |
3134 | /// function overrides a virtual member function marked 'final', according to |
3135 | /// C++11 [class.virtual]p4. |
3136 | bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, |
3137 | const CXXMethodDecl *Old) { |
3138 | FinalAttr *FA = Old->getAttr<FinalAttr>(); |
3139 | if (!FA) |
3140 | return false; |
3141 | |
3142 | Diag(New->getLocation(), diag::err_final_function_overridden) |
3143 | << New->getDeclName() |
3144 | << FA->isSpelledAsSealed(); |
3145 | Diag(Old->getLocation(), diag::note_overridden_virtual_function); |
3146 | return true; |
3147 | } |
3148 | |
3149 | static bool InitializationHasSideEffects(const FieldDecl &FD) { |
3150 | const Type *T = FD.getType()->getBaseElementTypeUnsafe(); |
3151 | // FIXME: Destruction of ObjC lifetime types has side-effects. |
3152 | if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) |
3153 | return !RD->isCompleteDefinition() || |
3154 | !RD->hasTrivialDefaultConstructor() || |
3155 | !RD->hasTrivialDestructor(); |
3156 | return false; |
3157 | } |
3158 | |
3159 | static const ParsedAttr *getMSPropertyAttr(const ParsedAttributesView &list) { |
3160 | ParsedAttributesView::const_iterator Itr = |
3161 | llvm::find_if(list, [](const ParsedAttr &AL) { |
3162 | return AL.isDeclspecPropertyAttribute(); |
3163 | }); |
3164 | if (Itr != list.end()) |
3165 | return &*Itr; |
3166 | return nullptr; |
3167 | } |
3168 | |
3169 | // Check if there is a field shadowing. |
3170 | void Sema::CheckShadowInheritedFields(const SourceLocation &Loc, |
3171 | DeclarationName FieldName, |
3172 | const CXXRecordDecl *RD, |
3173 | bool DeclIsField) { |
3174 | if (Diags.isIgnored(diag::warn_shadow_field, Loc)) |
3175 | return; |
3176 | |
3177 | // To record a shadowed field in a base |
3178 | std::map<CXXRecordDecl*, NamedDecl*> Bases; |
3179 | auto FieldShadowed = [&](const CXXBaseSpecifier *Specifier, |
3180 | CXXBasePath &Path) { |
3181 | const auto Base = Specifier->getType()->getAsCXXRecordDecl(); |
3182 | // Record an ambiguous path directly |
3183 | if (Bases.find(Base) != Bases.end()) |
3184 | return true; |
3185 | for (const auto Field : Base->lookup(FieldName)) { |
3186 | if ((isa<FieldDecl>(Field) || isa<IndirectFieldDecl>(Field)) && |
3187 | Field->getAccess() != AS_private) { |
3188 | assert(Field->getAccess() != AS_none)((void)0); |
3189 | assert(Bases.find(Base) == Bases.end())((void)0); |
3190 | Bases[Base] = Field; |
3191 | return true; |
3192 | } |
3193 | } |
3194 | return false; |
3195 | }; |
3196 | |
3197 | CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, |
3198 | /*DetectVirtual=*/true); |
3199 | if (!RD->lookupInBases(FieldShadowed, Paths)) |
3200 | return; |
3201 | |
3202 | for (const auto &P : Paths) { |
3203 | auto Base = P.back().Base->getType()->getAsCXXRecordDecl(); |
3204 | auto It = Bases.find(Base); |
3205 | // Skip duplicated bases |
3206 | if (It == Bases.end()) |
3207 | continue; |
3208 | auto BaseField = It->second; |
3209 | assert(BaseField->getAccess() != AS_private)((void)0); |
3210 | if (AS_none != |
3211 | CXXRecordDecl::MergeAccess(P.Access, BaseField->getAccess())) { |
3212 | Diag(Loc, diag::warn_shadow_field) |
3213 | << FieldName << RD << Base << DeclIsField; |
3214 | Diag(BaseField->getLocation(), diag::note_shadow_field); |
3215 | Bases.erase(It); |
3216 | } |
3217 | } |
3218 | } |
3219 | |
3220 | /// ActOnCXXMemberDeclarator - This is invoked when a C++ class member |
3221 | /// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the |
3222 | /// bitfield width if there is one, 'InitExpr' specifies the initializer if |
3223 | /// one has been parsed, and 'InitStyle' is set if an in-class initializer is |
3224 | /// present (but parsing it has been deferred). |
3225 | NamedDecl * |
3226 | Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, |
3227 | MultiTemplateParamsArg TemplateParameterLists, |
3228 | Expr *BW, const VirtSpecifiers &VS, |
3229 | InClassInitStyle InitStyle) { |
3230 | const DeclSpec &DS = D.getDeclSpec(); |
3231 | DeclarationNameInfo NameInfo = GetNameForDeclarator(D); |
3232 | DeclarationName Name = NameInfo.getName(); |
3233 | SourceLocation Loc = NameInfo.getLoc(); |
3234 | |
3235 | // For anonymous bitfields, the location should point to the type. |
3236 | if (Loc.isInvalid()) |
3237 | Loc = D.getBeginLoc(); |
3238 | |
3239 | Expr *BitWidth = static_cast<Expr*>(BW); |
3240 | |
3241 | assert(isa<CXXRecordDecl>(CurContext))((void)0); |
3242 | assert(!DS.isFriendSpecified())((void)0); |
3243 | |
3244 | bool isFunc = D.isDeclarationOfFunction(); |
3245 | const ParsedAttr *MSPropertyAttr = |
3246 | getMSPropertyAttr(D.getDeclSpec().getAttributes()); |
3247 | |
3248 | if (cast<CXXRecordDecl>(CurContext)->isInterface()) { |
3249 | // The Microsoft extension __interface only permits public member functions |
3250 | // and prohibits constructors, destructors, operators, non-public member |
3251 | // functions, static methods and data members. |
3252 | unsigned InvalidDecl; |
3253 | bool ShowDeclName = true; |
3254 | if (!isFunc && |
3255 | (DS.getStorageClassSpec() == DeclSpec::SCS_typedef || MSPropertyAttr)) |
3256 | InvalidDecl = 0; |
3257 | else if (!isFunc) |
3258 | InvalidDecl = 1; |
3259 | else if (AS != AS_public) |
3260 | InvalidDecl = 2; |
3261 | else if (DS.getStorageClassSpec() == DeclSpec::SCS_static) |
3262 | InvalidDecl = 3; |
3263 | else switch (Name.getNameKind()) { |
3264 | case DeclarationName::CXXConstructorName: |
3265 | InvalidDecl = 4; |
3266 | ShowDeclName = false; |
3267 | break; |
3268 | |
3269 | case DeclarationName::CXXDestructorName: |
3270 | InvalidDecl = 5; |
3271 | ShowDeclName = false; |
3272 | break; |
3273 | |
3274 | case DeclarationName::CXXOperatorName: |
3275 | case DeclarationName::CXXConversionFunctionName: |
3276 | InvalidDecl = 6; |
3277 | break; |
3278 | |
3279 | default: |
3280 | InvalidDecl = 0; |
3281 | break; |
3282 | } |
3283 | |
3284 | if (InvalidDecl) { |
3285 | if (ShowDeclName) |
3286 | Diag(Loc, diag::err_invalid_member_in_interface) |
3287 | << (InvalidDecl-1) << Name; |
3288 | else |
3289 | Diag(Loc, diag::err_invalid_member_in_interface) |
3290 | << (InvalidDecl-1) << ""; |
3291 | return nullptr; |
3292 | } |
3293 | } |
3294 | |
3295 | // C++ 9.2p6: A member shall not be declared to have automatic storage |
3296 | // duration (auto, register) or with the extern storage-class-specifier. |
3297 | // C++ 7.1.1p8: The mutable specifier can be applied only to names of class |
3298 | // data members and cannot be applied to names declared const or static, |
3299 | // and cannot be applied to reference members. |
3300 | switch (DS.getStorageClassSpec()) { |
3301 | case DeclSpec::SCS_unspecified: |
3302 | case DeclSpec::SCS_typedef: |
3303 | case DeclSpec::SCS_static: |
3304 | break; |
3305 | case DeclSpec::SCS_mutable: |
3306 | if (isFunc) { |
3307 | Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); |
3308 | |
3309 | // FIXME: It would be nicer if the keyword was ignored only for this |
3310 | // declarator. Otherwise we could get follow-up errors. |
3311 | D.getMutableDeclSpec().ClearStorageClassSpecs(); |
3312 | } |
3313 | break; |
3314 | default: |
3315 | Diag(DS.getStorageClassSpecLoc(), |
3316 | diag::err_storageclass_invalid_for_member); |
3317 | D.getMutableDeclSpec().ClearStorageClassSpecs(); |
3318 | break; |
3319 | } |
3320 | |
3321 | bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || |
3322 | DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && |
3323 | !isFunc); |
3324 | |
3325 | if (DS.hasConstexprSpecifier() && isInstField) { |
3326 | SemaDiagnosticBuilder B = |
3327 | Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr_member); |
3328 | SourceLocation ConstexprLoc = DS.getConstexprSpecLoc(); |
3329 | if (InitStyle == ICIS_NoInit) { |
3330 | B << 0 << 0; |
3331 | if (D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) |
3332 | B << FixItHint::CreateRemoval(ConstexprLoc); |
3333 | else { |
3334 | B << FixItHint::CreateReplacement(ConstexprLoc, "const"); |
3335 | D.getMutableDeclSpec().ClearConstexprSpec(); |
3336 | const char *PrevSpec; |
3337 | unsigned DiagID; |
3338 | bool Failed = D.getMutableDeclSpec().SetTypeQual( |
3339 | DeclSpec::TQ_const, ConstexprLoc, PrevSpec, DiagID, getLangOpts()); |
3340 | (void)Failed; |
3341 | assert(!Failed && "Making a constexpr member const shouldn't fail")((void)0); |
3342 | } |
3343 | } else { |
3344 | B << 1; |
3345 | const char *PrevSpec; |
3346 | unsigned DiagID; |
3347 | if (D.getMutableDeclSpec().SetStorageClassSpec( |
3348 | *this, DeclSpec::SCS_static, ConstexprLoc, PrevSpec, DiagID, |
3349 | Context.getPrintingPolicy())) { |
3350 | assert(DS.getStorageClassSpec() == DeclSpec::SCS_mutable &&((void)0) |
3351 | "This is the only DeclSpec that should fail to be applied")((void)0); |
3352 | B << 1; |
3353 | } else { |
3354 | B << 0 << FixItHint::CreateInsertion(ConstexprLoc, "static "); |
3355 | isInstField = false; |
3356 | } |
3357 | } |
3358 | } |
3359 | |
3360 | NamedDecl *Member; |
3361 | if (isInstField) { |
3362 | CXXScopeSpec &SS = D.getCXXScopeSpec(); |
3363 | |
3364 | // Data members must have identifiers for names. |
3365 | if (!Name.isIdentifier()) { |
3366 | Diag(Loc, diag::err_bad_variable_name) |
3367 | << Name; |
3368 | return nullptr; |
3369 | } |
3370 | |
3371 | IdentifierInfo *II = Name.getAsIdentifierInfo(); |
3372 | |
3373 | // Member field could not be with "template" keyword. |
3374 | // So TemplateParameterLists should be empty in this case. |
3375 | if (TemplateParameterLists.size()) { |
3376 | TemplateParameterList* TemplateParams = TemplateParameterLists[0]; |
3377 | if (TemplateParams->size()) { |
3378 | // There is no such thing as a member field template. |
3379 | Diag(D.getIdentifierLoc(), diag::err_template_member) |
3380 | << II |
3381 | << SourceRange(TemplateParams->getTemplateLoc(), |
3382 | TemplateParams->getRAngleLoc()); |
3383 | } else { |
3384 | // There is an extraneous 'template<>' for this member. |
3385 | Diag(TemplateParams->getTemplateLoc(), |
3386 | diag::err_template_member_noparams) |
3387 | << II |
3388 | << SourceRange(TemplateParams->getTemplateLoc(), |
3389 | TemplateParams->getRAngleLoc()); |
3390 | } |
3391 | return nullptr; |
3392 | } |
3393 | |
3394 | if (SS.isSet() && !SS.isInvalid()) { |
3395 | // The user provided a superfluous scope specifier inside a class |
3396 | // definition: |
3397 | // |
3398 | // class X { |
3399 | // int X::member; |
3400 | // }; |
3401 | if (DeclContext *DC = computeDeclContext(SS, false)) |
3402 | diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc(), |
3403 | D.getName().getKind() == |
3404 | UnqualifiedIdKind::IK_TemplateId); |
3405 | else |
3406 | Diag(D.getIdentifierLoc(), diag::err_member_qualification) |
3407 | << Name << SS.getRange(); |
3408 | |
3409 | SS.clear(); |
3410 | } |
3411 | |
3412 | if (MSPropertyAttr) { |
3413 | Member = HandleMSProperty(S, cast<CXXRecordDecl>(CurContext), Loc, D, |
3414 | BitWidth, InitStyle, AS, *MSPropertyAttr); |
3415 | if (!Member) |
3416 | return nullptr; |
3417 | isInstField = false; |
3418 | } else { |
3419 | Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, |
3420 | BitWidth, InitStyle, AS); |
3421 | if (!Member) |
3422 | return nullptr; |
3423 | } |
3424 | |
3425 | CheckShadowInheritedFields(Loc, Name, cast<CXXRecordDecl>(CurContext)); |
3426 | } else { |
3427 | Member = HandleDeclarator(S, D, TemplateParameterLists); |
3428 | if (!Member) |
3429 | return nullptr; |
3430 | |
3431 | // Non-instance-fields can't have a bitfield. |
3432 | if (BitWidth) { |
3433 | if (Member->isInvalidDecl()) { |
3434 | // don't emit another diagnostic. |
3435 | } else if (isa<VarDecl>(Member) || isa<VarTemplateDecl>(Member)) { |
3436 | // C++ 9.6p3: A bit-field shall not be a static member. |
3437 | // "static member 'A' cannot be a bit-field" |
3438 | Diag(Loc, diag::err_static_not_bitfield) |
3439 | << Name << BitWidth->getSourceRange(); |
3440 | } else if (isa<TypedefDecl>(Member)) { |
3441 | // "typedef member 'x' cannot be a bit-field" |
3442 | Diag(Loc, diag::err_typedef_not_bitfield) |
3443 | << Name << BitWidth->getSourceRange(); |
3444 | } else { |
3445 | // A function typedef ("typedef int f(); f a;"). |
3446 | // C++ 9.6p3: A bit-field shall have integral or enumeration type. |
3447 | Diag(Loc, diag::err_not_integral_type_bitfield) |
3448 | << Name << cast<ValueDecl>(Member)->getType() |
3449 | << BitWidth->getSourceRange(); |
3450 | } |
3451 | |
3452 | BitWidth = nullptr; |
3453 | Member->setInvalidDecl(); |
3454 | } |
3455 | |
3456 | NamedDecl *NonTemplateMember = Member; |
3457 | if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) |
3458 | NonTemplateMember = FunTmpl->getTemplatedDecl(); |
3459 | else if (VarTemplateDecl *VarTmpl = dyn_cast<VarTemplateDecl>(Member)) |
3460 | NonTemplateMember = VarTmpl->getTemplatedDecl(); |
3461 | |
3462 | Member->setAccess(AS); |
3463 | |
3464 | // If we have declared a member function template or static data member |
3465 | // template, set the access of the templated declaration as well. |
3466 | if (NonTemplateMember != Member) |
3467 | NonTemplateMember->setAccess(AS); |
3468 | |
3469 | // C++ [temp.deduct.guide]p3: |
3470 | // A deduction guide [...] for a member class template [shall be |
3471 | // declared] with the same access [as the template]. |
3472 | if (auto *DG = dyn_cast<CXXDeductionGuideDecl>(NonTemplateMember)) { |
3473 | auto *TD = DG->getDeducedTemplate(); |
3474 | // Access specifiers are only meaningful if both the template and the |
3475 | // deduction guide are from the same scope. |
3476 | if (AS != TD->getAccess() && |
3477 | TD->getDeclContext()->getRedeclContext()->Equals( |
3478 | DG->getDeclContext()->getRedeclContext())) { |
3479 | Diag(DG->getBeginLoc(), diag::err_deduction_guide_wrong_access); |
3480 | Diag(TD->getBeginLoc(), diag::note_deduction_guide_template_access) |
3481 | << TD->getAccess(); |
3482 | const AccessSpecDecl *LastAccessSpec = nullptr; |
3483 | for (const auto *D : cast<CXXRecordDecl>(CurContext)->decls()) { |
3484 | if (const auto *AccessSpec = dyn_cast<AccessSpecDecl>(D)) |
3485 | LastAccessSpec = AccessSpec; |
3486 | } |
3487 | assert(LastAccessSpec && "differing access with no access specifier")((void)0); |
3488 | Diag(LastAccessSpec->getBeginLoc(), diag::note_deduction_guide_access) |
3489 | << AS; |
3490 | } |
3491 | } |
3492 | } |
3493 | |
3494 | if (VS.isOverrideSpecified()) |
3495 | Member->addAttr(OverrideAttr::Create(Context, VS.getOverrideLoc(), |
3496 | AttributeCommonInfo::AS_Keyword)); |
3497 | if (VS.isFinalSpecified()) |
3498 | Member->addAttr(FinalAttr::Create( |
3499 | Context, VS.getFinalLoc(), AttributeCommonInfo::AS_Keyword, |
3500 | static_cast<FinalAttr::Spelling>(VS.isFinalSpelledSealed()))); |
3501 | |
3502 | if (VS.getLastLocation().isValid()) { |
3503 | // Update the end location of a method that has a virt-specifiers. |
3504 | if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) |
3505 | MD->setRangeEnd(VS.getLastLocation()); |
3506 | } |
3507 | |
3508 | CheckOverrideControl(Member); |
3509 | |
3510 | assert((Name || isInstField) && "No identifier for non-field ?")((void)0); |
3511 | |
3512 | if (isInstField) { |
3513 | FieldDecl *FD = cast<FieldDecl>(Member); |
3514 | FieldCollector->Add(FD); |
3515 | |
3516 | if (!Diags.isIgnored(diag::warn_unused_private_field, FD->getLocation())) { |
3517 | // Remember all explicit private FieldDecls that have a name, no side |
3518 | // effects and are not part of a dependent type declaration. |
3519 | if (!FD->isImplicit() && FD->getDeclName() && |
3520 | FD->getAccess() == AS_private && |
3521 | !FD->hasAttr<UnusedAttr>() && |
3522 | !FD->getParent()->isDependentContext() && |
3523 | !InitializationHasSideEffects(*FD)) |
3524 | UnusedPrivateFields.insert(FD); |
3525 | } |
3526 | } |
3527 | |
3528 | return Member; |
3529 | } |
3530 | |
3531 | namespace { |
3532 | class UninitializedFieldVisitor |
3533 | : public EvaluatedExprVisitor<UninitializedFieldVisitor> { |
3534 | Sema &S; |
3535 | // List of Decls to generate a warning on. Also remove Decls that become |
3536 | // initialized. |
3537 | llvm::SmallPtrSetImpl<ValueDecl*> &Decls; |
3538 | // List of base classes of the record. Classes are removed after their |
3539 | // initializers. |
3540 | llvm::SmallPtrSetImpl<QualType> &BaseClasses; |
3541 | // Vector of decls to be removed from the Decl set prior to visiting the |
3542 | // nodes. These Decls may have been initialized in the prior initializer. |
3543 | llvm::SmallVector<ValueDecl*, 4> DeclsToRemove; |
3544 | // If non-null, add a note to the warning pointing back to the constructor. |
3545 | const CXXConstructorDecl *Constructor; |
3546 | // Variables to hold state when processing an initializer list. When |
3547 | // InitList is true, special case initialization of FieldDecls matching |
3548 | // InitListFieldDecl. |
3549 | bool InitList; |
3550 | FieldDecl *InitListFieldDecl; |
3551 | llvm::SmallVector<unsigned, 4> InitFieldIndex; |
3552 | |
3553 | public: |
3554 | typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; |
3555 | UninitializedFieldVisitor(Sema &S, |
3556 | llvm::SmallPtrSetImpl<ValueDecl*> &Decls, |
3557 | llvm::SmallPtrSetImpl<QualType> &BaseClasses) |
3558 | : Inherited(S.Context), S(S), Decls(Decls), BaseClasses(BaseClasses), |
3559 | Constructor(nullptr), InitList(false), InitListFieldDecl(nullptr) {} |
3560 | |
3561 | // Returns true if the use of ME is not an uninitialized use. |
3562 | bool IsInitListMemberExprInitialized(MemberExpr *ME, |
3563 | bool CheckReferenceOnly) { |
3564 | llvm::SmallVector<FieldDecl*, 4> Fields; |
3565 | bool ReferenceField = false; |
3566 | while (ME) { |
3567 | FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl()); |
3568 | if (!FD) |
3569 | return false; |
3570 | Fields.push_back(FD); |
3571 | if (FD->getType()->isReferenceType()) |
3572 | ReferenceField = true; |
3573 | ME = dyn_cast<MemberExpr>(ME->getBase()->IgnoreParenImpCasts()); |
3574 | } |
3575 | |
3576 | // Binding a reference to an uninitialized field is not an |
3577 | // uninitialized use. |
3578 | if (CheckReferenceOnly && !ReferenceField) |
3579 | return true; |
3580 | |
3581 | llvm::SmallVector<unsigned, 4> UsedFieldIndex; |
3582 | // Discard the first field since it is the field decl that is being |
3583 | // initialized. |
3584 | for (auto I = Fields.rbegin() + 1, E = Fields.rend(); I != E; ++I) { |
3585 | UsedFieldIndex.push_back((*I)->getFieldIndex()); |
3586 | } |
3587 | |
3588 | for (auto UsedIter = UsedFieldIndex.begin(), |
3589 | UsedEnd = UsedFieldIndex.end(), |
3590 | OrigIter = InitFieldIndex.begin(), |
3591 | OrigEnd = InitFieldIndex.end(); |
3592 | UsedIter != UsedEnd && OrigIter != OrigEnd; ++UsedIter, ++OrigIter) { |
3593 | if (*UsedIter < *OrigIter) |
3594 | return true; |
3595 | if (*UsedIter > *OrigIter) |
3596 | break; |
3597 | } |
3598 | |
3599 | return false; |
3600 | } |
3601 | |
3602 | void HandleMemberExpr(MemberExpr *ME, bool CheckReferenceOnly, |
3603 | bool AddressOf) { |
3604 | if (isa<EnumConstantDecl>(ME->getMemberDecl())) |
3605 | return; |
3606 | |
3607 | // FieldME is the inner-most MemberExpr that is not an anonymous struct |
3608 | // or union. |
3609 | MemberExpr *FieldME = ME; |
3610 | |
3611 | bool AllPODFields = FieldME->getType().isPODType(S.Context); |
3612 | |
3613 | Expr *Base = ME; |
3614 | while (MemberExpr *SubME = |
3615 | dyn_cast<MemberExpr>(Base->IgnoreParenImpCasts())) { |
3616 | |
3617 | if (isa<VarDecl>(SubME->getMemberDecl())) |
3618 | return; |
3619 | |
3620 | if (FieldDecl *FD = dyn_cast<FieldDecl>(SubME->getMemberDecl())) |
3621 | if (!FD->isAnonymousStructOrUnion()) |
3622 | FieldME = SubME; |
3623 | |
3624 | if (!FieldME->getType().isPODType(S.Context)) |
3625 | AllPODFields = false; |
3626 | |
3627 | Base = SubME->getBase(); |
3628 | } |
3629 | |
3630 | if (!isa<CXXThisExpr>(Base->IgnoreParenImpCasts())) { |
3631 | Visit(Base); |
3632 | return; |
3633 | } |
3634 | |
3635 | if (AddressOf && AllPODFields) |
3636 | return; |
3637 | |
3638 | ValueDecl* FoundVD = FieldME->getMemberDecl(); |
3639 | |
3640 | if (ImplicitCastExpr *BaseCast = dyn_cast<ImplicitCastExpr>(Base)) { |
3641 | while (isa<ImplicitCastExpr>(BaseCast->getSubExpr())) { |
3642 | BaseCast = cast<ImplicitCastExpr>(BaseCast->getSubExpr()); |
3643 | } |
3644 | |
3645 | if (BaseCast->getCastKind() == CK_UncheckedDerivedToBase) { |
3646 | QualType T = BaseCast->getType(); |
3647 | if (T->isPointerType() && |
3648 | BaseClasses.count(T->getPointeeType())) { |
3649 | S.Diag(FieldME->getExprLoc(), diag::warn_base_class_is_uninit) |
3650 | << T->getPointeeType() << FoundVD; |
3651 | } |
3652 | } |
3653 | } |
3654 | |
3655 | if (!Decls.count(FoundVD)) |
3656 | return; |
3657 | |
3658 | const bool IsReference = FoundVD->getType()->isReferenceType(); |
3659 | |
3660 | if (InitList && !AddressOf && FoundVD == InitListFieldDecl) { |
3661 | // Special checking for initializer lists. |
3662 | if (IsInitListMemberExprInitialized(ME, CheckReferenceOnly)) { |
3663 | return; |
3664 | } |
3665 | } else { |
3666 | // Prevent double warnings on use of unbounded references. |
3667 | if (CheckReferenceOnly && !IsReference) |
3668 | return; |
3669 | } |
3670 | |
3671 | unsigned diag = IsReference |
3672 | ? diag::warn_reference_field_is_uninit |
3673 | : diag::warn_field_is_uninit; |
3674 | S.Diag(FieldME->getExprLoc(), diag) << FoundVD; |
3675 | if (Constructor) |
3676 | S.Diag(Constructor->getLocation(), |
3677 | diag::note_uninit_in_this_constructor) |
3678 | << (Constructor->isDefaultConstructor() && Constructor->isImplicit()); |
3679 | |
3680 | } |
3681 | |
3682 | void HandleValue(Expr *E, bool AddressOf) { |
3683 | E = E->IgnoreParens(); |
3684 | |
3685 | if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { |
3686 | HandleMemberExpr(ME, false /*CheckReferenceOnly*/, |
3687 | AddressOf /*AddressOf*/); |
3688 | return; |
3689 | } |
3690 | |
3691 | if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { |
3692 | Visit(CO->getCond()); |
3693 | HandleValue(CO->getTrueExpr(), AddressOf); |
3694 | HandleValue(CO->getFalseExpr(), AddressOf); |
3695 | return; |
3696 | } |
3697 | |
3698 | if (BinaryConditionalOperator *BCO = |
3699 | dyn_cast<BinaryConditionalOperator>(E)) { |
3700 | Visit(BCO->getCond()); |
3701 | HandleValue(BCO->getFalseExpr(), AddressOf); |
3702 | return; |
3703 | } |
3704 | |
3705 | if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) { |
3706 | HandleValue(OVE->getSourceExpr(), AddressOf); |
3707 | return; |
3708 | } |
3709 | |
3710 | if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { |
3711 | switch (BO->getOpcode()) { |
3712 | default: |
3713 | break; |
3714 | case(BO_PtrMemD): |
3715 | case(BO_PtrMemI): |
3716 | HandleValue(BO->getLHS(), AddressOf); |
3717 | Visit(BO->getRHS()); |
3718 | return; |
3719 | case(BO_Comma): |
3720 | Visit(BO->getLHS()); |
3721 | HandleValue(BO->getRHS(), AddressOf); |
3722 | return; |
3723 | } |
3724 | } |
3725 | |
3726 | Visit(E); |
3727 | } |
3728 | |
3729 | void CheckInitListExpr(InitListExpr *ILE) { |
3730 | InitFieldIndex.push_back(0); |
3731 | for (auto Child : ILE->children()) { |
3732 | if (InitListExpr *SubList = dyn_cast<InitListExpr>(Child)) { |
3733 | CheckInitListExpr(SubList); |
3734 | } else { |
3735 | Visit(Child); |
3736 | } |
3737 | ++InitFieldIndex.back(); |
3738 | } |
3739 | InitFieldIndex.pop_back(); |
3740 | } |
3741 | |
3742 | void CheckInitializer(Expr *E, const CXXConstructorDecl *FieldConstructor, |
3743 | FieldDecl *Field, const Type *BaseClass) { |
3744 | // Remove Decls that may have been initialized in the previous |
3745 | // initializer. |
3746 | for (ValueDecl* VD : DeclsToRemove) |
3747 | Decls.erase(VD); |
3748 | DeclsToRemove.clear(); |
3749 | |
3750 | Constructor = FieldConstructor; |
3751 | InitListExpr *ILE = dyn_cast<InitListExpr>(E); |
3752 | |
3753 | if (ILE && Field) { |
3754 | InitList = true; |
3755 | InitListFieldDecl = Field; |
3756 | InitFieldIndex.clear(); |
3757 | CheckInitListExpr(ILE); |
3758 | } else { |
3759 | InitList = false; |
3760 | Visit(E); |
3761 | } |
3762 | |
3763 | if (Field) |
3764 | Decls.erase(Field); |
3765 | if (BaseClass) |
3766 | BaseClasses.erase(BaseClass->getCanonicalTypeInternal()); |
3767 | } |
3768 | |
3769 | void VisitMemberExpr(MemberExpr *ME) { |
3770 | // All uses of unbounded reference fields will warn. |
3771 | HandleMemberExpr(ME, true /*CheckReferenceOnly*/, false /*AddressOf*/); |
3772 | } |
3773 | |
3774 | void VisitImplicitCastExpr(ImplicitCastExpr *E) { |
3775 | if (E->getCastKind() == CK_LValueToRValue) { |
3776 | HandleValue(E->getSubExpr(), false /*AddressOf*/); |
3777 | return; |
3778 | } |
3779 | |
3780 | Inherited::VisitImplicitCastExpr(E); |
3781 | } |
3782 | |
3783 | void VisitCXXConstructExpr(CXXConstructExpr *E) { |
3784 | if (E->getConstructor()->isCopyConstructor()) { |
3785 | Expr *ArgExpr = E->getArg(0); |
3786 | if (InitListExpr *ILE = dyn_cast<InitListExpr>(ArgExpr)) |
3787 | if (ILE->getNumInits() == 1) |
3788 | ArgExpr = ILE->getInit(0); |
3789 | if (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgExpr)) |
3790 | if (ICE->getCastKind() == CK_NoOp) |
3791 | ArgExpr = ICE->getSubExpr(); |
3792 | HandleValue(ArgExpr, false /*AddressOf*/); |
3793 | return; |
3794 | } |
3795 | Inherited::VisitCXXConstructExpr(E); |
3796 | } |
3797 | |
3798 | void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { |
3799 | Expr *Callee = E->getCallee(); |
3800 | if (isa<MemberExpr>(Callee)) { |
3801 | HandleValue(Callee, false /*AddressOf*/); |
3802 | for (auto Arg : E->arguments()) |
3803 | Visit(Arg); |
3804 | return; |
3805 | } |
3806 | |
3807 | Inherited::VisitCXXMemberCallExpr(E); |
3808 | } |
3809 | |
3810 | void VisitCallExpr(CallExpr *E) { |
3811 | // Treat std::move as a use. |
3812 | if (E->isCallToStdMove()) { |
3813 | HandleValue(E->getArg(0), /*AddressOf=*/false); |
3814 | return; |
3815 | } |
3816 | |
3817 | Inherited::VisitCallExpr(E); |
3818 | } |
3819 | |
3820 | void VisitCXXOperatorCallExpr(CXXOperatorCallExpr *E) { |
3821 | Expr *Callee = E->getCallee(); |
3822 | |
3823 | if (isa<UnresolvedLookupExpr>(Callee)) |
3824 | return Inherited::VisitCXXOperatorCallExpr(E); |
3825 | |
3826 | Visit(Callee); |
3827 | for (auto Arg : E->arguments()) |
3828 | HandleValue(Arg->IgnoreParenImpCasts(), false /*AddressOf*/); |
3829 | } |
3830 | |
3831 | void VisitBinaryOperator(BinaryOperator *E) { |
3832 | // If a field assignment is detected, remove the field from the |
3833 | // uninitiailized field set. |
3834 | if (E->getOpcode() == BO_Assign) |
3835 | if (MemberExpr *ME = dyn_cast<MemberExpr>(E->getLHS())) |
3836 | if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) |
3837 | if (!FD->getType()->isReferenceType()) |
3838 | DeclsToRemove.push_back(FD); |
3839 | |
3840 | if (E->isCompoundAssignmentOp()) { |
3841 | HandleValue(E->getLHS(), false /*AddressOf*/); |
3842 | Visit(E->getRHS()); |
3843 | return; |
3844 | } |
3845 | |
3846 | Inherited::VisitBinaryOperator(E); |
3847 | } |
3848 | |
3849 | void VisitUnaryOperator(UnaryOperator *E) { |
3850 | if (E->isIncrementDecrementOp()) { |
3851 | HandleValue(E->getSubExpr(), false /*AddressOf*/); |
3852 | return; |
3853 | } |
3854 | if (E->getOpcode() == UO_AddrOf) { |
3855 | if (MemberExpr *ME = dyn_cast<MemberExpr>(E->getSubExpr())) { |
3856 | HandleValue(ME->getBase(), true /*AddressOf*/); |
3857 | return; |
3858 | } |
3859 | } |
3860 | |
3861 | Inherited::VisitUnaryOperator(E); |
3862 | } |
3863 | }; |
3864 | |
3865 | // Diagnose value-uses of fields to initialize themselves, e.g. |
3866 | // foo(foo) |
3867 | // where foo is not also a parameter to the constructor. |
3868 | // Also diagnose across field uninitialized use such as |
3869 | // x(y), y(x) |
3870 | // TODO: implement -Wuninitialized and fold this into that framework. |
3871 | static void DiagnoseUninitializedFields( |
3872 | Sema &SemaRef, const CXXConstructorDecl *Constructor) { |
3873 | |
3874 | if (SemaRef.getDiagnostics().isIgnored(diag::warn_field_is_uninit, |
3875 | Constructor->getLocation())) { |
3876 | return; |
3877 | } |
3878 | |
3879 | if (Constructor->isInvalidDecl()) |
3880 | return; |
3881 | |
3882 | const CXXRecordDecl *RD = Constructor->getParent(); |
3883 | |
3884 | if (RD->isDependentContext()) |
3885 | return; |
3886 | |
3887 | // Holds fields that are uninitialized. |
3888 | llvm::SmallPtrSet<ValueDecl*, 4> UninitializedFields; |
3889 | |
3890 | // At the beginning, all fields are uninitialized. |
3891 | for (auto *I : RD->decls()) { |
3892 | if (auto *FD = dyn_cast<FieldDecl>(I)) { |
3893 | UninitializedFields.insert(FD); |
3894 | } else if (auto *IFD = dyn_cast<IndirectFieldDecl>(I)) { |
3895 | UninitializedFields.insert(IFD->getAnonField()); |
3896 | } |
3897 | } |
3898 | |
3899 | llvm::SmallPtrSet<QualType, 4> UninitializedBaseClasses; |
3900 | for (auto I : RD->bases()) |
3901 | UninitializedBaseClasses.insert(I.getType().getCanonicalType()); |
3902 | |
3903 | if (UninitializedFields.empty() && UninitializedBaseClasses.empty()) |
3904 | return; |
3905 | |
3906 | UninitializedFieldVisitor UninitializedChecker(SemaRef, |
3907 | UninitializedFields, |
3908 | UninitializedBaseClasses); |
3909 | |
3910 | for (const auto *FieldInit : Constructor->inits()) { |
3911 | if (UninitializedFields.empty() && UninitializedBaseClasses.empty()) |
3912 | break; |
3913 | |
3914 | Expr *InitExpr = FieldInit->getInit(); |
3915 | if (!InitExpr) |
3916 | continue; |
3917 | |
3918 | if (CXXDefaultInitExpr *Default = |
3919 | dyn_cast<CXXDefaultInitExpr>(InitExpr)) { |
3920 | InitExpr = Default->getExpr(); |
3921 | if (!InitExpr) |
3922 | continue; |
3923 | // In class initializers will point to the constructor. |
3924 | UninitializedChecker.CheckInitializer(InitExpr, Constructor, |
3925 | FieldInit->getAnyMember(), |
3926 | FieldInit->getBaseClass()); |
3927 | } else { |
3928 | UninitializedChecker.CheckInitializer(InitExpr, nullptr, |
3929 | FieldInit->getAnyMember(), |
3930 | FieldInit->getBaseClass()); |
3931 | } |
3932 | } |
3933 | } |
3934 | } // namespace |
3935 | |
3936 | /// Enter a new C++ default initializer scope. After calling this, the |
3937 | /// caller must call \ref ActOnFinishCXXInClassMemberInitializer, even if |
3938 | /// parsing or instantiating the initializer failed. |
3939 | void Sema::ActOnStartCXXInClassMemberInitializer() { |
3940 | // Create a synthetic function scope to represent the call to the constructor |
3941 | // that notionally surrounds a use of this initializer. |
3942 | PushFunctionScope(); |
3943 | } |
3944 | |
3945 | void Sema::ActOnStartTrailingRequiresClause(Scope *S, Declarator &D) { |
3946 | if (!D.isFunctionDeclarator()) |
3947 | return; |
3948 | auto &FTI = D.getFunctionTypeInfo(); |
3949 | if (!FTI.Params) |
3950 | return; |
3951 | for (auto &Param : ArrayRef<DeclaratorChunk::ParamInfo>(FTI.Params, |
3952 | FTI.NumParams)) { |
3953 | auto *ParamDecl = cast<NamedDecl>(Param.Param); |
3954 | if (ParamDecl->getDeclName()) |
3955 | PushOnScopeChains(ParamDecl, S, /*AddToContext=*/false); |
3956 | } |
3957 | } |
3958 | |
3959 | ExprResult Sema::ActOnFinishTrailingRequiresClause(ExprResult ConstraintExpr) { |
3960 | return ActOnRequiresClause(ConstraintExpr); |
3961 | } |
3962 | |
3963 | ExprResult Sema::ActOnRequiresClause(ExprResult ConstraintExpr) { |
3964 | if (ConstraintExpr.isInvalid()) |
3965 | return ExprError(); |
3966 | |
3967 | ConstraintExpr = CorrectDelayedTyposInExpr(ConstraintExpr); |
3968 | if (ConstraintExpr.isInvalid()) |
3969 | return ExprError(); |
3970 | |
3971 | if (DiagnoseUnexpandedParameterPack(ConstraintExpr.get(), |
3972 | UPPC_RequiresClause)) |
3973 | return ExprError(); |
3974 | |
3975 | return ConstraintExpr; |
3976 | } |
3977 | |
3978 | /// This is invoked after parsing an in-class initializer for a |
3979 | /// non-static C++ class member, and after instantiating an in-class initializer |
3980 | /// in a class template. Such actions are deferred until the class is complete. |
3981 | void Sema::ActOnFinishCXXInClassMemberInitializer(Decl *D, |
3982 | SourceLocation InitLoc, |
3983 | Expr *InitExpr) { |
3984 | // Pop the notional constructor scope we created earlier. |
3985 | PopFunctionScopeInfo(nullptr, D); |
3986 | |
3987 | FieldDecl *FD = dyn_cast<FieldDecl>(D); |
3988 | assert((isa<MSPropertyDecl>(D) || FD->getInClassInitStyle() != ICIS_NoInit) &&((void)0) |
3989 | "must set init style when field is created")((void)0); |
3990 | |
3991 | if (!InitExpr) { |
3992 | D->setInvalidDecl(); |
3993 | if (FD) |
3994 | FD->removeInClassInitializer(); |
3995 | return; |
3996 | } |
3997 | |
3998 | if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { |
3999 | FD->setInvalidDecl(); |
4000 | FD->removeInClassInitializer(); |
4001 | return; |
4002 | } |
4003 | |
4004 | ExprResult Init = InitExpr; |
4005 | if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { |
4006 | InitializedEntity Entity = |
4007 | InitializedEntity::InitializeMemberFromDefaultMemberInitializer(FD); |
4008 | InitializationKind Kind = |
4009 | FD->getInClassInitStyle() == ICIS_ListInit |
4010 | ? InitializationKind::CreateDirectList(InitExpr->getBeginLoc(), |
4011 | InitExpr->getBeginLoc(), |
4012 | InitExpr->getEndLoc()) |
4013 | : InitializationKind::CreateCopy(InitExpr->getBeginLoc(), InitLoc); |
4014 | InitializationSequence Seq(*this, Entity, Kind, InitExpr); |
4015 | Init = Seq.Perform(*this, Entity, Kind, InitExpr); |
4016 | if (Init.isInvalid()) { |
4017 | FD->setInvalidDecl(); |
4018 | return; |
4019 | } |
4020 | } |
4021 | |
4022 | // C++11 [class.base.init]p7: |
4023 | // The initialization of each base and member constitutes a |
4024 | // full-expression. |
4025 | Init = ActOnFinishFullExpr(Init.get(), InitLoc, /*DiscardedValue*/ false); |
4026 | if (Init.isInvalid()) { |
4027 | FD->setInvalidDecl(); |
4028 | return; |
4029 | } |
4030 | |
4031 | InitExpr = Init.get(); |
4032 | |
4033 | FD->setInClassInitializer(InitExpr); |
4034 | } |
4035 | |
4036 | /// Find the direct and/or virtual base specifiers that |
4037 | /// correspond to the given base type, for use in base initialization |
4038 | /// within a constructor. |
4039 | static bool FindBaseInitializer(Sema &SemaRef, |
4040 | CXXRecordDecl *ClassDecl, |
4041 | QualType BaseType, |
4042 | const CXXBaseSpecifier *&DirectBaseSpec, |
4043 | const CXXBaseSpecifier *&VirtualBaseSpec) { |
4044 | // First, check for a direct base class. |
4045 | DirectBaseSpec = nullptr; |
4046 | for (const auto &Base : ClassDecl->bases()) { |
4047 | if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base.getType())) { |
4048 | // We found a direct base of this type. That's what we're |
4049 | // initializing. |
4050 | DirectBaseSpec = &Base; |
4051 | break; |
4052 | } |
4053 | } |
4054 | |
4055 | // Check for a virtual base class. |
4056 | // FIXME: We might be able to short-circuit this if we know in advance that |
4057 | // there are no virtual bases. |
4058 | VirtualBaseSpec = nullptr; |
4059 | if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { |
4060 | // We haven't found a base yet; search the class hierarchy for a |
4061 | // virtual base class. |
4062 | CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, |
4063 | /*DetectVirtual=*/false); |
4064 | if (SemaRef.IsDerivedFrom(ClassDecl->getLocation(), |
4065 | SemaRef.Context.getTypeDeclType(ClassDecl), |
4066 | BaseType, Paths)) { |
4067 | for (CXXBasePaths::paths_iterator Path = Paths.begin(); |
4068 | Path != Paths.end(); ++Path) { |
4069 | if (Path->back().Base->isVirtual()) { |
4070 | VirtualBaseSpec = Path->back().Base; |
4071 | break; |
4072 | } |
4073 | } |
4074 | } |
4075 | } |
4076 | |
4077 | return DirectBaseSpec || VirtualBaseSpec; |
4078 | } |
4079 | |
4080 | /// Handle a C++ member initializer using braced-init-list syntax. |
4081 | MemInitResult |
4082 | Sema::ActOnMemInitializer(Decl *ConstructorD, |
4083 | Scope *S, |
4084 | CXXScopeSpec &SS, |
4085 | IdentifierInfo *MemberOrBase, |
4086 | ParsedType TemplateTypeTy, |
4087 | const DeclSpec &DS, |
4088 | SourceLocation IdLoc, |
4089 | Expr *InitList, |
4090 | SourceLocation EllipsisLoc) { |
4091 | return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, |
4092 | DS, IdLoc, InitList, |
4093 | EllipsisLoc); |
4094 | } |
4095 | |
4096 | /// Handle a C++ member initializer using parentheses syntax. |
4097 | MemInitResult |
4098 | Sema::ActOnMemInitializer(Decl *ConstructorD, |
4099 | Scope *S, |
4100 | CXXScopeSpec &SS, |
4101 | IdentifierInfo *MemberOrBase, |
4102 | ParsedType TemplateTypeTy, |
4103 | const DeclSpec &DS, |
4104 | SourceLocation IdLoc, |
4105 | SourceLocation LParenLoc, |
4106 | ArrayRef<Expr *> Args, |
4107 | SourceLocation RParenLoc, |
4108 | SourceLocation EllipsisLoc) { |
4109 | Expr *List = ParenListExpr::Create(Context, LParenLoc, Args, RParenLoc); |
4110 | return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, |
4111 | DS, IdLoc, List, EllipsisLoc); |
4112 | } |
4113 | |
4114 | namespace { |
4115 | |
4116 | // Callback to only accept typo corrections that can be a valid C++ member |
4117 | // intializer: either a non-static field member or a base class. |
4118 | class MemInitializerValidatorCCC final : public CorrectionCandidateCallback { |
4119 | public: |
4120 | explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) |
4121 | : ClassDecl(ClassDecl) {} |
4122 | |
4123 | bool ValidateCandidate(const TypoCorrection &candidate) override { |
4124 | if (NamedDecl *ND = candidate.getCorrectionDecl()) { |
4125 | if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) |
4126 | return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); |
4127 | return isa<TypeDecl>(ND); |
4128 | } |
4129 | return false; |
4130 | } |
4131 | |
4132 | std::unique_ptr<CorrectionCandidateCallback> clone() override { |
4133 | return std::make_unique<MemInitializerValidatorCCC>(*this); |
4134 | } |
4135 | |
4136 | private: |
4137 | CXXRecordDecl *ClassDecl; |
4138 | }; |
4139 | |
4140 | } |
4141 | |
4142 | ValueDecl *Sema::tryLookupCtorInitMemberDecl(CXXRecordDecl *ClassDecl, |
4143 | CXXScopeSpec &SS, |
4144 | ParsedType TemplateTypeTy, |
4145 | IdentifierInfo *MemberOrBase) { |
4146 | if (SS.getScopeRep() || TemplateTypeTy) |
4147 | return nullptr; |
4148 | for (auto *D : ClassDecl->lookup(MemberOrBase)) |
4149 | if (isa<FieldDecl>(D) || isa<IndirectFieldDecl>(D)) |
4150 | return cast<ValueDecl>(D); |
4151 | return nullptr; |
4152 | } |
4153 | |
4154 | /// Handle a C++ member initializer. |
4155 | MemInitResult |
4156 | Sema::BuildMemInitializer(Decl *ConstructorD, |
4157 | Scope *S, |
4158 | CXXScopeSpec &SS, |
4159 | IdentifierInfo *MemberOrBase, |
4160 | ParsedType TemplateTypeTy, |
4161 | const DeclSpec &DS, |
4162 | SourceLocation IdLoc, |
4163 | Expr *Init, |
4164 | SourceLocation EllipsisLoc) { |
4165 | ExprResult Res = CorrectDelayedTyposInExpr(Init); |
4166 | if (!Res.isUsable()) |
4167 | return true; |
4168 | Init = Res.get(); |
4169 | |
4170 | if (!ConstructorD) |
4171 | return true; |
4172 | |
4173 | AdjustDeclIfTemplate(ConstructorD); |
4174 | |
4175 | CXXConstructorDecl *Constructor |
4176 | = dyn_cast<CXXConstructorDecl>(ConstructorD); |
4177 | if (!Constructor) { |
4178 | // The user wrote a constructor initializer on a function that is |
4179 | // not a C++ constructor. Ignore the error for now, because we may |
4180 | // have more member initializers coming; we'll diagnose it just |
4181 | // once in ActOnMemInitializers. |
4182 | return true; |
4183 | } |
4184 | |
4185 | CXXRecordDecl *ClassDecl = Constructor->getParent(); |
4186 | |
4187 | // C++ [class.base.init]p2: |
4188 | // Names in a mem-initializer-id are looked up in the scope of the |
4189 | // constructor's class and, if not found in that scope, are looked |
4190 | // up in the scope containing the constructor's definition. |
4191 | // [Note: if the constructor's class contains a member with the |
4192 | // same name as a direct or virtual base class of the class, a |
4193 | // mem-initializer-id naming the member or base class and composed |
4194 | // of a single identifier refers to the class member. A |
4195 | // mem-initializer-id for the hidden base class may be specified |
4196 | // using a qualified name. ] |
4197 | |
4198 | // Look for a member, first. |
4199 | if (ValueDecl *Member = tryLookupCtorInitMemberDecl( |
4200 | ClassDecl, SS, TemplateTypeTy, MemberOrBase)) { |
4201 | if (EllipsisLoc.isValid()) |
4202 | Diag(EllipsisLoc, diag::err_pack_expansion_member_init) |
4203 | << MemberOrBase |
4204 | << SourceRange(IdLoc, Init->getSourceRange().getEnd()); |
4205 | |
4206 | return BuildMemberInitializer(Member, Init, IdLoc); |
4207 | } |
4208 | // It didn't name a member, so see if it names a class. |
4209 | QualType BaseType; |
4210 | TypeSourceInfo *TInfo = nullptr; |
4211 | |
4212 | if (TemplateTypeTy) { |
4213 | BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); |
4214 | if (BaseType.isNull()) |
4215 | return true; |
4216 | } else if (DS.getTypeSpecType() == TST_decltype) { |
4217 | BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); |
4218 | } else if (DS.getTypeSpecType() == TST_decltype_auto) { |
4219 | Diag(DS.getTypeSpecTypeLoc(), diag::err_decltype_auto_invalid); |
4220 | return true; |
4221 | } else { |
4222 | LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); |
4223 | LookupParsedName(R, S, &SS); |
4224 | |
4225 | TypeDecl *TyD = R.getAsSingle<TypeDecl>(); |
4226 | if (!TyD) { |
4227 | if (R.isAmbiguous()) return true; |
4228 | |
4229 | // We don't want access-control diagnostics here. |
4230 | R.suppressDiagnostics(); |
4231 | |
4232 | if (SS.isSet() && isDependentScopeSpecifier(SS)) { |
4233 | bool NotUnknownSpecialization = false; |
4234 | DeclContext *DC = computeDeclContext(SS, false); |
4235 | if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) |
4236 | NotUnknownSpecialization = !Record->hasAnyDependentBases(); |
4237 | |
4238 | if (!NotUnknownSpecialization) { |
4239 | // When the scope specifier can refer to a member of an unknown |
4240 | // specialization, we take it as a type name. |
4241 | BaseType = CheckTypenameType(ETK_None, SourceLocation(), |
4242 | SS.getWithLocInContext(Context), |
4243 | *MemberOrBase, IdLoc); |
4244 | if (BaseType.isNull()) |
4245 | return true; |
4246 | |
4247 | TInfo = Context.CreateTypeSourceInfo(BaseType); |
4248 | DependentNameTypeLoc TL = |
4249 | TInfo->getTypeLoc().castAs<DependentNameTypeLoc>(); |
4250 | if (!TL.isNull()) { |
4251 | TL.setNameLoc(IdLoc); |
4252 | TL.setElaboratedKeywordLoc(SourceLocation()); |
4253 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); |
4254 | } |
4255 | |
4256 | R.clear(); |
4257 | R.setLookupName(MemberOrBase); |
4258 | } |
4259 | } |
4260 | |
4261 | // If no results were found, try to correct typos. |
4262 | TypoCorrection Corr; |
4263 | MemInitializerValidatorCCC CCC(ClassDecl); |
4264 | if (R.empty() && BaseType.isNull() && |
4265 | (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, |
4266 | CCC, CTK_ErrorRecovery, ClassDecl))) { |
4267 | if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { |
4268 | // We have found a non-static data member with a similar |
4269 | // name to what was typed; complain and initialize that |
4270 | // member. |
4271 | diagnoseTypo(Corr, |
4272 | PDiag(diag::err_mem_init_not_member_or_class_suggest) |
4273 | << MemberOrBase << true); |
4274 | return BuildMemberInitializer(Member, Init, IdLoc); |
4275 | } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { |
4276 | const CXXBaseSpecifier *DirectBaseSpec; |
4277 | const CXXBaseSpecifier *VirtualBaseSpec; |
4278 | if (FindBaseInitializer(*this, ClassDecl, |
4279 | Context.getTypeDeclType(Type), |
4280 | DirectBaseSpec, VirtualBaseSpec)) { |
4281 | // We have found a direct or virtual base class with a |
4282 | // similar name to what was typed; complain and initialize |
4283 | // that base class. |
4284 | diagnoseTypo(Corr, |
4285 | PDiag(diag::err_mem_init_not_member_or_class_suggest) |
4286 | << MemberOrBase << false, |
4287 | PDiag() /*Suppress note, we provide our own.*/); |
4288 | |
4289 | const CXXBaseSpecifier *BaseSpec = DirectBaseSpec ? DirectBaseSpec |
4290 | : VirtualBaseSpec; |
4291 | Diag(BaseSpec->getBeginLoc(), diag::note_base_class_specified_here) |
4292 | << BaseSpec->getType() << BaseSpec->getSourceRange(); |
4293 | |
4294 | TyD = Type; |
4295 | } |
4296 | } |
4297 | } |
4298 | |
4299 | if (!TyD && BaseType.isNull()) { |
4300 | Diag(IdLoc, diag::err_mem_init_not_member_or_class) |
4301 | << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); |
4302 | return true; |
4303 | } |
4304 | } |
4305 | |
4306 | if (BaseType.isNull()) { |
4307 | BaseType = Context.getTypeDeclType(TyD); |
4308 | MarkAnyDeclReferenced(TyD->getLocation(), TyD, /*OdrUse=*/false); |
4309 | if (SS.isSet()) { |
4310 | BaseType = Context.getElaboratedType(ETK_None, SS.getScopeRep(), |
4311 | BaseType); |
4312 | TInfo = Context.CreateTypeSourceInfo(BaseType); |
4313 | ElaboratedTypeLoc TL = TInfo->getTypeLoc().castAs<ElaboratedTypeLoc>(); |
4314 | TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(IdLoc); |
4315 | TL.setElaboratedKeywordLoc(SourceLocation()); |
4316 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); |
4317 | } |
4318 | } |
4319 | } |
4320 | |
4321 | if (!TInfo) |
4322 | TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); |
4323 | |
4324 | return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); |
4325 | } |
4326 | |
4327 | MemInitResult |
4328 | Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, |
4329 | SourceLocation IdLoc) { |
4330 | FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); |
4331 | IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); |
4332 | assert((DirectMember || IndirectMember) &&((void)0) |
4333 | "Member must be a FieldDecl or IndirectFieldDecl")((void)0); |
4334 | |
4335 | if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) |
4336 | return true; |
4337 | |
4338 | if (Member->isInvalidDecl()) |
4339 | return true; |
4340 | |
4341 | MultiExprArg Args; |
4342 | if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { |
4343 | Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); |
4344 | } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) { |
4345 | Args = MultiExprArg(InitList->getInits(), InitList->getNumInits()); |
4346 | } else { |
4347 | // Template instantiation doesn't reconstruct ParenListExprs for us. |
4348 | Args = Init; |
4349 | } |
4350 | |
4351 | SourceRange InitRange = Init->getSourceRange(); |
4352 | |
4353 | if (Member->getType()->isDependentType() || Init->isTypeDependent()) { |
4354 | // Can't check initialization for a member of dependent type or when |
4355 | // any of the arguments are type-dependent expressions. |
4356 | DiscardCleanupsInEvaluationContext(); |
4357 | } else { |
4358 | bool InitList = false; |
4359 | if (isa<InitListExpr>(Init)) { |
4360 | InitList = true; |
4361 | Args = Init; |
4362 | } |
4363 | |
4364 | // Initialize the member. |
4365 | InitializedEntity MemberEntity = |
4366 | DirectMember ? InitializedEntity::InitializeMember(DirectMember, nullptr) |
4367 | : InitializedEntity::InitializeMember(IndirectMember, |
4368 | nullptr); |
4369 | InitializationKind Kind = |
4370 | InitList ? InitializationKind::CreateDirectList( |
4371 | IdLoc, Init->getBeginLoc(), Init->getEndLoc()) |
4372 | : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), |
4373 | InitRange.getEnd()); |
4374 | |
4375 | InitializationSequence InitSeq(*this, MemberEntity, Kind, Args); |
4376 | ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, Args, |
4377 | nullptr); |
4378 | if (MemberInit.isInvalid()) |
4379 | return true; |
4380 | |
4381 | // C++11 [class.base.init]p7: |
4382 | // The initialization of each base and member constitutes a |
4383 | // full-expression. |
4384 | MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin(), |
4385 | /*DiscardedValue*/ false); |
4386 | if (MemberInit.isInvalid()) |
4387 | return true; |
4388 | |
4389 | Init = MemberInit.get(); |
4390 | } |
4391 | |
4392 | if (DirectMember) { |
4393 | return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, |
4394 | InitRange.getBegin(), Init, |
4395 | InitRange.getEnd()); |
4396 | } else { |
4397 | return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, |
4398 | InitRange.getBegin(), Init, |
4399 | InitRange.getEnd()); |
4400 | } |
4401 | } |
4402 | |
4403 | MemInitResult |
4404 | Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, |
4405 | CXXRecordDecl *ClassDecl) { |
4406 | SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); |
4407 | if (!LangOpts.CPlusPlus11) |
4408 | return Diag(NameLoc, diag::err_delegating_ctor) |
4409 | << TInfo->getTypeLoc().getLocalSourceRange(); |
4410 | Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); |
4411 | |
4412 | bool InitList = true; |
4413 | MultiExprArg Args = Init; |
4414 | if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { |
4415 | InitList = false; |
4416 | Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); |
4417 | } |
4418 | |
4419 | SourceRange InitRange = Init->getSourceRange(); |
4420 | // Initialize the object. |
4421 | InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( |
4422 | QualType(ClassDecl->getTypeForDecl(), 0)); |
4423 | InitializationKind Kind = |
4424 | InitList ? InitializationKind::CreateDirectList( |
4425 | NameLoc, Init->getBeginLoc(), Init->getEndLoc()) |
4426 | : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), |
4427 | InitRange.getEnd()); |
4428 | InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args); |
4429 | ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, |
4430 | Args, nullptr); |
4431 | if (DelegationInit.isInvalid()) |
4432 | return true; |
4433 | |
4434 | assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() &&((void)0) |
4435 | "Delegating constructor with no target?")((void)0); |
4436 | |
4437 | // C++11 [class.base.init]p7: |
4438 | // The initialization of each base and member constitutes a |
4439 | // full-expression. |
4440 | DelegationInit = ActOnFinishFullExpr( |
4441 | DelegationInit.get(), InitRange.getBegin(), /*DiscardedValue*/ false); |
4442 | if (DelegationInit.isInvalid()) |
4443 | return true; |
4444 | |
4445 | // If we are in a dependent context, template instantiation will |
4446 | // perform this type-checking again. Just save the arguments that we |
4447 | // received in a ParenListExpr. |
4448 | // FIXME: This isn't quite ideal, since our ASTs don't capture all |
4449 | // of the information that we have about the base |
4450 | // initializer. However, deconstructing the ASTs is a dicey process, |
4451 | // and this approach is far more likely to get the corner cases right. |
4452 | if (CurContext->isDependentContext()) |
4453 | DelegationInit = Init; |
4454 | |
4455 | return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), |
4456 | DelegationInit.getAs<Expr>(), |
4457 | InitRange.getEnd()); |
4458 | } |
4459 | |
4460 | MemInitResult |
4461 | Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, |
4462 | Expr *Init, CXXRecordDecl *ClassDecl, |
4463 | SourceLocation EllipsisLoc) { |
4464 | SourceLocation BaseLoc |
4465 | = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); |
4466 | |
4467 | if (!BaseType->isDependentType() && !BaseType->isRecordType()) |
4468 | return Diag(BaseLoc, diag::err_base_init_does_not_name_class) |
4469 | << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); |
4470 | |
4471 | // C++ [class.base.init]p2: |
4472 | // [...] Unless the mem-initializer-id names a nonstatic data |
4473 | // member of the constructor's class or a direct or virtual base |
4474 | // of that class, the mem-initializer is ill-formed. A |
4475 | // mem-initializer-list can initialize a base class using any |
4476 | // name that denotes that base class type. |
4477 | bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); |
4478 | |
4479 | SourceRange InitRange = Init->getSourceRange(); |
4480 | if (EllipsisLoc.isValid()) { |
4481 | // This is a pack expansion. |
4482 | if (!BaseType->containsUnexpandedParameterPack()) { |
4483 | Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) |
4484 | << SourceRange(BaseLoc, InitRange.getEnd()); |
4485 | |
4486 | EllipsisLoc = SourceLocation(); |
4487 | } |
4488 | } else { |
4489 | // Check for any unexpanded parameter packs. |
4490 | if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) |
4491 | return true; |
4492 | |
4493 | if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) |
4494 | return true; |
4495 | } |
4496 | |
4497 | // Check for direct and virtual base classes. |
4498 | const CXXBaseSpecifier *DirectBaseSpec = nullptr; |
4499 | const CXXBaseSpecifier *VirtualBaseSpec = nullptr; |
4500 | if (!Dependent) { |
4501 | if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), |
4502 | BaseType)) |
4503 | return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); |
4504 | |
4505 | FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, |
4506 | VirtualBaseSpec); |
4507 | |
4508 | // C++ [base.class.init]p2: |
4509 | // Unless the mem-initializer-id names a nonstatic data member of the |
4510 | // constructor's class or a direct or virtual base of that class, the |
4511 | // mem-initializer is ill-formed. |
4512 | if (!DirectBaseSpec && !VirtualBaseSpec) { |
4513 | // If the class has any dependent bases, then it's possible that |
4514 | // one of those types will resolve to the same type as |
4515 | // BaseType. Therefore, just treat this as a dependent base |
4516 | // class initialization. FIXME: Should we try to check the |
4517 | // initialization anyway? It seems odd. |
4518 | if (ClassDecl->hasAnyDependentBases()) |
4519 | Dependent = true; |
4520 | else |
4521 | return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) |
4522 | << BaseType << Context.getTypeDeclType(ClassDecl) |
4523 | << BaseTInfo->getTypeLoc().getLocalSourceRange(); |
4524 | } |
4525 | } |
4526 | |
4527 | if (Dependent) { |
4528 | DiscardCleanupsInEvaluationContext(); |
4529 | |
4530 | return new (Context) CXXCtorInitializer(Context, BaseTInfo, |
4531 | /*IsVirtual=*/false, |
4532 | InitRange.getBegin(), Init, |
4533 | InitRange.getEnd(), EllipsisLoc); |
4534 | } |
4535 | |
4536 | // C++ [base.class.init]p2: |
4537 | // If a mem-initializer-id is ambiguous because it designates both |
4538 | // a direct non-virtual base class and an inherited virtual base |
4539 | // class, the mem-initializer is ill-formed. |
4540 | if (DirectBaseSpec && VirtualBaseSpec) |
4541 | return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) |
4542 | << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); |
4543 | |
4544 | const CXXBaseSpecifier *BaseSpec = DirectBaseSpec; |
4545 | if (!BaseSpec) |
4546 | BaseSpec = VirtualBaseSpec; |
4547 | |
4548 | // Initialize the base. |
4549 | bool InitList = true; |
4550 | MultiExprArg Args = Init; |
4551 | if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { |
4552 | InitList = false; |
4553 | Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); |
4554 | } |
4555 | |
4556 | InitializedEntity BaseEntity = |
4557 | InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); |
4558 | InitializationKind Kind = |
4559 | InitList ? InitializationKind::CreateDirectList(BaseLoc) |
4560 | : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), |
4561 | InitRange.getEnd()); |
4562 | InitializationSequence InitSeq(*this, BaseEntity, Kind, Args); |
4563 | ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, Args, nullptr); |
4564 | if (BaseInit.isInvalid()) |
4565 | return true; |
4566 | |
4567 | // C++11 [class.base.init]p7: |
4568 | // The initialization of each base and member constitutes a |
4569 | // full-expression. |
4570 | BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin(), |
4571 | /*DiscardedValue*/ false); |
4572 | if (BaseInit.isInvalid()) |
4573 | return true; |
4574 | |
4575 | // If we are in a dependent context, template instantiation will |
4576 | // perform this type-checking again. Just save the arguments that we |
4577 | // received in a ParenListExpr. |
4578 | // FIXME: This isn't quite ideal, since our ASTs don't capture all |
4579 | // of the information that we have about the base |
4580 | // initializer. However, deconstructing the ASTs is a dicey process, |
4581 | // and this approach is far more likely to get the corner cases right. |
4582 | if (CurContext->isDependentContext()) |
4583 | BaseInit = Init; |
4584 | |
4585 | return new (Context) CXXCtorInitializer(Context, BaseTInfo, |
4586 | BaseSpec->isVirtual(), |
4587 | InitRange.getBegin(), |
4588 | BaseInit.getAs<Expr>(), |
4589 | InitRange.getEnd(), EllipsisLoc); |
4590 | } |
4591 | |
4592 | // Create a static_cast\<T&&>(expr). |
4593 | static Expr *CastForMoving(Sema &SemaRef, Expr *E, QualType T = QualType()) { |
4594 | if (T.isNull()) T = E->getType(); |
4595 | QualType TargetType = SemaRef.BuildReferenceType( |
4596 | T, /*SpelledAsLValue*/false, SourceLocation(), DeclarationName()); |
4597 | SourceLocation ExprLoc = E->getBeginLoc(); |
4598 | TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( |
4599 | TargetType, ExprLoc); |
4600 | |
4601 | return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, |
4602 | SourceRange(ExprLoc, ExprLoc), |
4603 | E->getSourceRange()).get(); |
4604 | } |
4605 | |
4606 | /// ImplicitInitializerKind - How an implicit base or member initializer should |
4607 | /// initialize its base or member. |
4608 | enum ImplicitInitializerKind { |
4609 | IIK_Default, |
4610 | IIK_Copy, |
4611 | IIK_Move, |
4612 | IIK_Inherit |
4613 | }; |
4614 | |
4615 | static bool |
4616 | BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, |
4617 | ImplicitInitializerKind ImplicitInitKind, |
4618 | CXXBaseSpecifier *BaseSpec, |
4619 | bool IsInheritedVirtualBase, |
4620 | CXXCtorInitializer *&CXXBaseInit) { |
4621 | InitializedEntity InitEntity |
4622 | = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, |
4623 | IsInheritedVirtualBase); |
4624 | |
4625 | ExprResult BaseInit; |
4626 | |
4627 | switch (ImplicitInitKind) { |
4628 | case IIK_Inherit: |
4629 | case IIK_Default: { |
4630 | InitializationKind InitKind |
4631 | = InitializationKind::CreateDefault(Constructor->getLocation()); |
4632 | InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None); |
4633 | BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, None); |
4634 | break; |
4635 | } |
4636 | |
4637 | case IIK_Move: |
4638 | case IIK_Copy: { |
4639 | bool Moving = ImplicitInitKind == IIK_Move; |
4640 | ParmVarDecl *Param = Constructor->getParamDecl(0); |
4641 | QualType ParamType = Param->getType().getNonReferenceType(); |
4642 | |
4643 | Expr *CopyCtorArg = |
4644 | DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), |
4645 | SourceLocation(), Param, false, |
4646 | Constructor->getLocation(), ParamType, |
4647 | VK_LValue, nullptr); |
4648 | |
4649 | SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); |
4650 | |
4651 | // Cast to the base class to avoid ambiguities. |
4652 | QualType ArgTy = |
4653 | SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), |
4654 | ParamType.getQualifiers()); |
4655 | |
4656 | if (Moving) { |
4657 | CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); |
4658 | } |
4659 | |
4660 | CXXCastPath BasePath; |
4661 | BasePath.push_back(BaseSpec); |
4662 | CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, |
4663 | CK_UncheckedDerivedToBase, |
4664 | Moving ? VK_XValue : VK_LValue, |
4665 | &BasePath).get(); |
4666 | |
4667 | InitializationKind InitKind |
4668 | = InitializationKind::CreateDirect(Constructor->getLocation(), |
4669 | SourceLocation(), SourceLocation()); |
4670 | InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, CopyCtorArg); |
4671 | BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, CopyCtorArg); |
4672 | break; |
4673 | } |
4674 | } |
4675 | |
4676 | BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); |
4677 | if (BaseInit.isInvalid()) |
4678 | return true; |
4679 | |
4680 | CXXBaseInit = |
4681 | new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, |
4682 | SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), |
4683 | SourceLocation()), |
4684 | BaseSpec->isVirtual(), |
4685 | SourceLocation(), |
4686 | BaseInit.getAs<Expr>(), |
4687 | SourceLocation(), |
4688 | SourceLocation()); |
4689 | |
4690 | return false; |
4691 | } |
4692 | |
4693 | static bool RefersToRValueRef(Expr *MemRef) { |
4694 | ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); |
4695 | return Referenced->getType()->isRValueReferenceType(); |
4696 | } |
4697 | |
4698 | static bool |
4699 | BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, |
4700 | ImplicitInitializerKind ImplicitInitKind, |
4701 | FieldDecl *Field, IndirectFieldDecl *Indirect, |
4702 | CXXCtorInitializer *&CXXMemberInit) { |
4703 | if (Field->isInvalidDecl()) |
4704 | return true; |
4705 | |
4706 | SourceLocation Loc = Constructor->getLocation(); |
4707 | |
4708 | if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { |
4709 | bool Moving = ImplicitInitKind == IIK_Move; |
4710 | ParmVarDecl *Param = Constructor->getParamDecl(0); |
4711 | QualType ParamType = Param->getType().getNonReferenceType(); |
4712 | |
4713 | // Suppress copying zero-width bitfields. |
4714 | if (Field->isZeroLengthBitField(SemaRef.Context)) |
4715 | return false; |
4716 | |
4717 | Expr *MemberExprBase = |
4718 | DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), |
4719 | SourceLocation(), Param, false, |
4720 | Loc, ParamType, VK_LValue, nullptr); |
4721 | |
4722 | SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); |
4723 | |
4724 | if (Moving) { |
4725 | MemberExprBase = CastForMoving(SemaRef, MemberExprBase); |
4726 | } |
4727 | |
4728 | // Build a reference to this field within the parameter. |
4729 | CXXScopeSpec SS; |
4730 | LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, |
4731 | Sema::LookupMemberName); |
4732 | MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) |
4733 | : cast<ValueDecl>(Field), AS_public); |
4734 | MemberLookup.resolveKind(); |
4735 | ExprResult CtorArg |
4736 | = SemaRef.BuildMemberReferenceExpr(MemberExprBase, |
4737 | ParamType, Loc, |
4738 | /*IsArrow=*/false, |
4739 | SS, |
4740 | /*TemplateKWLoc=*/SourceLocation(), |
4741 | /*FirstQualifierInScope=*/nullptr, |
4742 | MemberLookup, |
4743 | /*TemplateArgs=*/nullptr, |
4744 | /*S*/nullptr); |
4745 | if (CtorArg.isInvalid()) |
4746 | return true; |
4747 | |
4748 | // C++11 [class.copy]p15: |
4749 | // - if a member m has rvalue reference type T&&, it is direct-initialized |
4750 | // with static_cast<T&&>(x.m); |
4751 | if (RefersToRValueRef(CtorArg.get())) { |
4752 | CtorArg = CastForMoving(SemaRef, CtorArg.get()); |
4753 | } |
4754 | |
4755 | InitializedEntity Entity = |
4756 | Indirect ? InitializedEntity::InitializeMember(Indirect, nullptr, |
4757 | /*Implicit*/ true) |
4758 | : InitializedEntity::InitializeMember(Field, nullptr, |
4759 | /*Implicit*/ true); |
4760 | |
4761 | // Direct-initialize to use the copy constructor. |
4762 | InitializationKind InitKind = |
4763 | InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); |
4764 | |
4765 | Expr *CtorArgE = CtorArg.getAs<Expr>(); |
4766 | InitializationSequence InitSeq(SemaRef, Entity, InitKind, CtorArgE); |
4767 | ExprResult MemberInit = |
4768 | InitSeq.Perform(SemaRef, Entity, InitKind, MultiExprArg(&CtorArgE, 1)); |
4769 | MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); |
4770 | if (MemberInit.isInvalid()) |
4771 | return true; |
4772 | |
4773 | if (Indirect) |
4774 | CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer( |
4775 | SemaRef.Context, Indirect, Loc, Loc, MemberInit.getAs<Expr>(), Loc); |
4776 | else |
4777 | CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer( |
4778 | SemaRef.Context, Field, Loc, Loc, MemberInit.getAs<Expr>(), Loc); |
4779 | return false; |
4780 | } |
4781 | |
4782 | assert((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) &&((void)0) |
4783 | "Unhandled implicit init kind!")((void)0); |
4784 | |
4785 | QualType FieldBaseElementType = |
4786 | SemaRef.Context.getBaseElementType(Field->getType()); |
4787 | |
4788 | if (FieldBaseElementType->isRecordType()) { |
4789 | InitializedEntity InitEntity = |
4790 | Indirect ? InitializedEntity::InitializeMember(Indirect, nullptr, |
4791 | /*Implicit*/ true) |
4792 | : InitializedEntity::InitializeMember(Field, nullptr, |
4793 | /*Implicit*/ true); |
4794 | InitializationKind InitKind = |
4795 | InitializationKind::CreateDefault(Loc); |
4796 | |
4797 | InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None); |
4798 | ExprResult MemberInit = |
4799 | InitSeq.Perform(SemaRef, InitEntity, InitKind, None); |
4800 | |
4801 | MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); |
4802 | if (MemberInit.isInvalid()) |
4803 | return true; |
4804 | |
4805 | if (Indirect) |
4806 | CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, |
4807 | Indirect, Loc, |
4808 | Loc, |
4809 | MemberInit.get(), |
4810 | Loc); |
4811 | else |
4812 | CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, |
4813 | Field, Loc, Loc, |
4814 | MemberInit.get(), |
4815 | Loc); |
4816 | return false; |
4817 | } |
4818 | |
4819 | if (!Field->getParent()->isUnion()) { |
4820 | if (FieldBaseElementType->isReferenceType()) { |
4821 | SemaRef.Diag(Constructor->getLocation(), |
4822 | diag::err_uninitialized_member_in_ctor) |
4823 | << (int)Constructor->isImplicit() |
4824 | << SemaRef.Context.getTagDeclType(Constructor->getParent()) |
4825 | << 0 << Field->getDeclName(); |
4826 | SemaRef.Diag(Field->getLocation(), diag::note_declared_at); |
4827 | return true; |
4828 | } |
4829 | |
4830 | if (FieldBaseElementType.isConstQualified()) { |
4831 | SemaRef.Diag(Constructor->getLocation(), |
4832 | diag::err_uninitialized_member_in_ctor) |
4833 | << (int)Constructor->isImplicit() |
4834 | << SemaRef.Context.getTagDeclType(Constructor->getParent()) |
4835 | << 1 << Field->getDeclName(); |
4836 | SemaRef.Diag(Field->getLocation(), diag::note_declared_at); |
4837 | return true; |
4838 | } |
4839 | } |
4840 | |
4841 | if (FieldBaseElementType.hasNonTrivialObjCLifetime()) { |
4842 | // ARC and Weak: |
4843 | // Default-initialize Objective-C pointers to NULL. |
4844 | CXXMemberInit |
4845 | = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, |
4846 | Loc, Loc, |
4847 | new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), |
4848 | Loc); |
4849 | return false; |
4850 | } |
4851 | |
4852 | // Nothing to initialize. |
4853 | CXXMemberInit = nullptr; |
4854 | return false; |
4855 | } |
4856 | |
4857 | namespace { |
4858 | struct BaseAndFieldInfo { |
4859 | Sema &S; |
4860 | CXXConstructorDecl *Ctor; |
4861 | bool AnyErrorsInInits; |
4862 | ImplicitInitializerKind IIK; |
4863 | llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; |
4864 | SmallVector<CXXCtorInitializer*, 8> AllToInit; |
4865 | llvm::DenseMap<TagDecl*, FieldDecl*> ActiveUnionMember; |
4866 | |
4867 | BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) |
4868 | : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { |
4869 | bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); |
4870 | if (Ctor->getInheritedConstructor()) |
4871 | IIK = IIK_Inherit; |
4872 | else if (Generated && Ctor->isCopyConstructor()) |
4873 | IIK = IIK_Copy; |
4874 | else if (Generated && Ctor->isMoveConstructor()) |
4875 | IIK = IIK_Move; |
4876 | else |
4877 | IIK = IIK_Default; |
4878 | } |
4879 | |
4880 | bool isImplicitCopyOrMove() const { |
4881 | switch (IIK) { |
4882 | case IIK_Copy: |
4883 | case IIK_Move: |
4884 | return true; |
4885 | |
4886 | case IIK_Default: |
4887 | case IIK_Inherit: |
4888 | return false; |
4889 | } |
4890 | |
4891 | llvm_unreachable("Invalid ImplicitInitializerKind!")__builtin_unreachable(); |
4892 | } |
4893 | |
4894 | bool addFieldInitializer(CXXCtorInitializer *Init) { |
4895 | AllToInit.push_back(Init); |
4896 | |
4897 | // Check whether this initializer makes the field "used". |
4898 | if (Init->getInit()->HasSideEffects(S.Context)) |
4899 | S.UnusedPrivateFields.remove(Init->getAnyMember()); |
4900 | |
4901 | return false; |
4902 | } |
4903 | |
4904 | bool isInactiveUnionMember(FieldDecl *Field) { |
4905 | RecordDecl *Record = Field->getParent(); |
4906 | if (!Record->isUnion()) |
4907 | return false; |
4908 | |
4909 | if (FieldDecl *Active = |
4910 | ActiveUnionMember.lookup(Record->getCanonicalDecl())) |
4911 | return Active != Field->getCanonicalDecl(); |
4912 | |
4913 | // In an implicit copy or move constructor, ignore any in-class initializer. |
4914 | if (isImplicitCopyOrMove()) |
4915 | return true; |
4916 | |
4917 | // If there's no explicit initialization, the field is active only if it |
4918 | // has an in-class initializer... |
4919 | if (Field->hasInClassInitializer()) |
4920 | return false; |
4921 | // ... or it's an anonymous struct or union whose class has an in-class |
4922 | // initializer. |
4923 | if (!Field->isAnonymousStructOrUnion()) |
4924 | return true; |
4925 | CXXRecordDecl *FieldRD = Field->getType()->getAsCXXRecordDecl(); |
4926 | return !FieldRD->hasInClassInitializer(); |
4927 | } |
4928 | |
4929 | /// Determine whether the given field is, or is within, a union member |
4930 | /// that is inactive (because there was an initializer given for a different |
4931 | /// member of the union, or because the union was not initialized at all). |
4932 | bool isWithinInactiveUnionMember(FieldDecl *Field, |
4933 | IndirectFieldDecl *Indirect) { |
4934 | if (!Indirect) |
4935 | return isInactiveUnionMember(Field); |
4936 | |
4937 | for (auto *C : Indirect->chain()) { |
4938 | FieldDecl *Field = dyn_cast<FieldDecl>(C); |
4939 | if (Field && isInactiveUnionMember(Field)) |
4940 | return true; |
4941 | } |
4942 | return false; |
4943 | } |
4944 | }; |
4945 | } |
4946 | |
4947 | /// Determine whether the given type is an incomplete or zero-lenfgth |
4948 | /// array type. |
4949 | static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { |
4950 | if (T->isIncompleteArrayType()) |
4951 | return true; |
4952 | |
4953 | while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { |
4954 | if (!ArrayT->getSize()) |
4955 | return true; |
4956 | |
4957 | T = ArrayT->getElementType(); |
4958 | } |
4959 | |
4960 | return false; |
4961 | } |
4962 | |
4963 | static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, |
4964 | FieldDecl *Field, |
4965 | IndirectFieldDecl *Indirect = nullptr) { |
4966 | if (Field->isInvalidDecl()) |
4967 | return false; |
4968 | |
4969 | // Overwhelmingly common case: we have a direct initializer for this field. |
4970 | if (CXXCtorInitializer *Init = |
4971 | Info.AllBaseFields.lookup(Field->getCanonicalDecl())) |
4972 | return Info.addFieldInitializer(Init); |
4973 | |
4974 | // C++11 [class.base.init]p8: |
4975 | // if the entity is a non-static data member that has a |
4976 | // brace-or-equal-initializer and either |
4977 | // -- the constructor's class is a union and no other variant member of that |
4978 | // union is designated by a mem-initializer-id or |
4979 | // -- the constructor's class is not a union, and, if the entity is a member |
4980 | // of an anonymous union, no other member of that union is designated by |
4981 | // a mem-initializer-id, |
4982 | // the entity is initialized as specified in [dcl.init]. |
4983 | // |
4984 | // We also apply the same rules to handle anonymous structs within anonymous |
4985 | // unions. |
4986 | if (Info.isWithinInactiveUnionMember(Field, Indirect)) |
4987 | return false; |
4988 | |
4989 | if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { |
4990 | ExprResult DIE = |
4991 | SemaRef.BuildCXXDefaultInitExpr(Info.Ctor->getLocation(), Field); |
4992 | if (DIE.isInvalid()) |
4993 | return true; |
4994 | |
4995 | auto Entity = InitializedEntity::InitializeMember(Field, nullptr, true); |
4996 | SemaRef.checkInitializerLifetime(Entity, DIE.get()); |
4997 | |
4998 | CXXCtorInitializer *Init; |
4999 | if (Indirect) |
5000 | Init = new (SemaRef.Context) |
5001 | CXXCtorInitializer(SemaRef.Context, Indirect, SourceLocation(), |
5002 | SourceLocation(), DIE.get(), SourceLocation()); |
5003 | else |
5004 | Init = new (SemaRef.Context) |
5005 | CXXCtorInitializer(SemaRef.Context, Field, SourceLocation(), |
5006 | SourceLocation(), DIE.get(), SourceLocation()); |
5007 | return Info.addFieldInitializer(Init); |
5008 | } |
5009 | |
5010 | // Don't initialize incomplete or zero-length arrays. |
5011 | if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) |
5012 | return false; |
5013 | |
5014 | // Don't try to build an implicit initializer if there were semantic |
5015 | // errors in any of the initializers (and therefore we might be |
5016 | // missing some that the user actually wrote). |
5017 | if (Info.AnyErrorsInInits) |
5018 | return false; |
5019 | |
5020 | CXXCtorInitializer *Init = nullptr; |
5021 | if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, |
5022 | Indirect, Init)) |
5023 | return true; |
5024 | |
5025 | if (!Init) |
5026 | return false; |
5027 | |
5028 | return Info.addFieldInitializer(Init); |
5029 | } |
5030 | |
5031 | bool |
5032 | Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, |
5033 | CXXCtorInitializer *Initializer) { |
5034 | assert(Initializer->isDelegatingInitializer())((void)0); |
5035 | Constructor->setNumCtorInitializers(1); |
5036 | CXXCtorInitializer **initializer = |
5037 | new (Context) CXXCtorInitializer*[1]; |
5038 | memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); |
5039 | Constructor->setCtorInitializers(initializer); |
5040 | |
5041 | if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { |
5042 | MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); |
5043 | DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); |
5044 | } |
5045 | |
5046 | DelegatingCtorDecls.push_back(Constructor); |
5047 | |
5048 | DiagnoseUninitializedFields(*this, Constructor); |
5049 | |
5050 | return false; |
5051 | } |
5052 | |
5053 | bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors, |
5054 | ArrayRef<CXXCtorInitializer *> Initializers) { |
5055 | if (Constructor->isDependentContext()) { |
5056 | // Just store the initializers as written, they will be checked during |
5057 | // instantiation. |
5058 | if (!Initializers.empty()) { |
5059 | Constructor->setNumCtorInitializers(Initializers.size()); |
5060 | CXXCtorInitializer **baseOrMemberInitializers = |
5061 | new (Context) CXXCtorInitializer*[Initializers.size()]; |
5062 | memcpy(baseOrMemberInitializers, Initializers.data(), |
5063 | Initializers.size() * sizeof(CXXCtorInitializer*)); |
5064 | Constructor->setCtorInitializers(baseOrMemberInitializers); |
5065 | } |
5066 | |
5067 | // Let template instantiation know whether we had errors. |
5068 | if (AnyErrors) |
5069 | Constructor->setInvalidDecl(); |
5070 | |
5071 | return false; |
5072 | } |
5073 | |
5074 | BaseAndFieldInfo Info(*this, Constructor, AnyErrors); |
5075 | |
5076 | // We need to build the initializer AST according to order of construction |
5077 | // and not what user specified in the Initializers list. |
5078 | CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); |
5079 | if (!ClassDecl) |
5080 | return true; |
5081 | |
5082 | bool HadError = false; |
5083 | |
5084 | for (unsigned i = 0; i < Initializers.size(); i++) { |
5085 | CXXCtorInitializer *Member = Initializers[i]; |
5086 | |
5087 | if (Member->isBaseInitializer()) |
5088 | Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; |
5089 | else { |
5090 | Info.AllBaseFields[Member->getAnyMember()->getCanonicalDecl()] = Member; |
5091 | |
5092 | if (IndirectFieldDecl *F = Member->getIndirectMember()) { |
5093 | for (auto *C : F->chain()) { |
5094 | FieldDecl *FD = dyn_cast<FieldDecl>(C); |
5095 | if (FD && FD->getParent()->isUnion()) |
5096 | Info.ActiveUnionMember.insert(std::make_pair( |
5097 | FD->getParent()->getCanonicalDecl(), FD->getCanonicalDecl())); |
5098 | } |
5099 | } else if (FieldDecl *FD = Member->getMember()) { |
5100 | if (FD->getParent()->isUnion()) |
5101 | Info.ActiveUnionMember.insert(std::make_pair( |
5102 | FD->getParent()->getCanonicalDecl(), FD->getCanonicalDecl())); |
5103 | } |
5104 | } |
5105 | } |
5106 | |
5107 | // Keep track of the direct virtual bases. |
5108 | llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; |
5109 | for (auto &I : ClassDecl->bases()) { |
5110 | if (I.isVirtual()) |
5111 | DirectVBases.insert(&I); |
5112 | } |
5113 | |
5114 | // Push virtual bases before others. |
5115 | for (auto &VBase : ClassDecl->vbases()) { |
5116 | if (CXXCtorInitializer *Value |
5117 | = Info.AllBaseFields.lookup(VBase.getType()->getAs<RecordType>())) { |
5118 | // [class.base.init]p7, per DR257: |
5119 | // A mem-initializer where the mem-initializer-id names a virtual base |
5120 | // class is ignored during execution of a constructor of any class that |
5121 | // is not the most derived class. |
5122 | if (ClassDecl->isAbstract()) { |
5123 | // FIXME: Provide a fixit to remove the base specifier. This requires |
5124 | // tracking the location of the associated comma for a base specifier. |
5125 | Diag(Value->getSourceLocation(), diag::warn_abstract_vbase_init_ignored) |
5126 | << VBase.getType() << ClassDecl; |
5127 | DiagnoseAbstractType(ClassDecl); |
5128 | } |
5129 | |
5130 | Info.AllToInit.push_back(Value); |
5131 | } else if (!AnyErrors && !ClassDecl->isAbstract()) { |
5132 | // [class.base.init]p8, per DR257: |
5133 | // If a given [...] base class is not named by a mem-initializer-id |
5134 | // [...] and the entity is not a virtual base class of an abstract |
5135 | // class, then [...] the entity is default-initialized. |
5136 | bool IsInheritedVirtualBase = !DirectVBases.count(&VBase); |
5137 | CXXCtorInitializer *CXXBaseInit; |
5138 | if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, |
5139 | &VBase, IsInheritedVirtualBase, |
5140 | CXXBaseInit)) { |
5141 | HadError = true; |
5142 | continue; |
5143 | } |
5144 | |
5145 | Info.AllToInit.push_back(CXXBaseInit); |
5146 | } |
5147 | } |
5148 | |
5149 | // Non-virtual bases. |
5150 | for (auto &Base : ClassDecl->bases()) { |
5151 | // Virtuals are in the virtual base list and already constructed. |
5152 | if (Base.isVirtual()) |
5153 | continue; |
5154 | |
5155 | if (CXXCtorInitializer *Value |
5156 | = Info.AllBaseFields.lookup(Base.getType()->getAs<RecordType>())) { |
5157 | Info.AllToInit.push_back(Value); |
5158 | } else if (!AnyErrors) { |
5159 | CXXCtorInitializer *CXXBaseInit; |
5160 | if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, |
5161 | &Base, /*IsInheritedVirtualBase=*/false, |
5162 | CXXBaseInit)) { |
5163 | HadError = true; |
5164 | continue; |
5165 | } |
5166 | |
5167 | Info.AllToInit.push_back(CXXBaseInit); |
5168 | } |
5169 | } |
5170 | |
5171 | // Fields. |
5172 | for (auto *Mem : ClassDecl->decls()) { |
5173 | if (auto *F = dyn_cast<FieldDecl>(Mem)) { |
5174 | // C++ [class.bit]p2: |
5175 | // A declaration for a bit-field that omits the identifier declares an |
5176 | // unnamed bit-field. Unnamed bit-fields are not members and cannot be |
5177 | // initialized. |
5178 | if (F->isUnnamedBitfield()) |
5179 | continue; |
5180 | |
5181 | // If we're not generating the implicit copy/move constructor, then we'll |
5182 | // handle anonymous struct/union fields based on their individual |
5183 | // indirect fields. |
5184 | if (F->isAnonymousStructOrUnion() && !Info.isImplicitCopyOrMove()) |
5185 | continue; |
5186 | |
5187 | if (CollectFieldInitializer(*this, Info, F)) |
5188 | HadError = true; |
5189 | continue; |
5190 | } |
5191 | |
5192 | // Beyond this point, we only consider default initialization. |
5193 | if (Info.isImplicitCopyOrMove()) |
5194 | continue; |
5195 | |
5196 | if (auto *F = dyn_cast<IndirectFieldDecl>(Mem)) { |
5197 | if (F->getType()->isIncompleteArrayType()) { |
5198 | assert(ClassDecl->hasFlexibleArrayMember() &&((void)0) |
5199 | "Incomplete array type is not valid")((void)0); |
5200 | continue; |
5201 | } |
5202 | |
5203 | // Initialize each field of an anonymous struct individually. |
5204 | if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) |
5205 | HadError = true; |
5206 | |
5207 | continue; |
5208 | } |
5209 | } |
5210 | |
5211 | unsigned NumInitializers = Info.AllToInit.size(); |
5212 | if (NumInitializers > 0) { |
5213 | Constructor->setNumCtorInitializers(NumInitializers); |
5214 | CXXCtorInitializer **baseOrMemberInitializers = |
5215 | new (Context) CXXCtorInitializer*[NumInitializers]; |
5216 | memcpy(baseOrMemberInitializers, Info.AllToInit.data(), |
5217 | NumInitializers * sizeof(CXXCtorInitializer*)); |
5218 | Constructor->setCtorInitializers(baseOrMemberInitializers); |
5219 | |
5220 | // Constructors implicitly reference the base and member |
5221 | // destructors. |
5222 | MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), |
5223 | Constructor->getParent()); |
5224 | } |
5225 | |
5226 | return HadError; |
5227 | } |
5228 | |
5229 | static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl<const void*> &IdealInits) { |
5230 | if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { |
5231 | const RecordDecl *RD = RT->getDecl(); |
5232 | if (RD->isAnonymousStructOrUnion()) { |
5233 | for (auto *Field : RD->fields()) |
5234 | PopulateKeysForFields(Field, IdealInits); |
5235 | return; |
5236 | } |
5237 | } |
5238 | IdealInits.push_back(Field->getCanonicalDecl()); |
5239 | } |
5240 | |
5241 | static const void *GetKeyForBase(ASTContext &Context, QualType BaseType) { |
5242 | return Context.getCanonicalType(BaseType).getTypePtr(); |
5243 | } |
5244 | |
5245 | static const void *GetKeyForMember(ASTContext &Context, |
5246 | CXXCtorInitializer *Member) { |
5247 | if (!Member->isAnyMemberInitializer()) |
5248 | return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); |
5249 | |
5250 | return Member->getAnyMember()->getCanonicalDecl(); |
5251 | } |
5252 | |
5253 | static void AddInitializerToDiag(const Sema::SemaDiagnosticBuilder &Diag, |
5254 | const CXXCtorInitializer *Previous, |
5255 | const CXXCtorInitializer *Current) { |
5256 | if (Previous->isAnyMemberInitializer()) |
5257 | Diag << 0 << Previous->getAnyMember(); |
5258 | else |
5259 | Diag << 1 << Previous->getTypeSourceInfo()->getType(); |
5260 | |
5261 | if (Current->isAnyMemberInitializer()) |
5262 | Diag << 0 << Current->getAnyMember(); |
5263 | else |
5264 | Diag << 1 << Current->getTypeSourceInfo()->getType(); |
5265 | } |
5266 | |
5267 | static void DiagnoseBaseOrMemInitializerOrder( |
5268 | Sema &SemaRef, const CXXConstructorDecl *Constructor, |
5269 | ArrayRef<CXXCtorInitializer *> Inits) { |
5270 | if (Constructor->getDeclContext()->isDependentContext()) |
5271 | return; |
5272 | |
5273 | // Don't check initializers order unless the warning is enabled at the |
5274 | // location of at least one initializer. |
5275 | bool ShouldCheckOrder = false; |
5276 | for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { |
5277 | CXXCtorInitializer *Init = Inits[InitIndex]; |
5278 | if (!SemaRef.Diags.isIgnored(diag::warn_initializer_out_of_order, |
5279 | Init->getSourceLocation())) { |
5280 | ShouldCheckOrder = true; |
5281 | break; |
5282 | } |
5283 | } |
5284 | if (!ShouldCheckOrder) |
5285 | return; |
5286 | |
5287 | // Build the list of bases and members in the order that they'll |
5288 | // actually be initialized. The explicit initializers should be in |
5289 | // this same order but may be missing things. |
5290 | SmallVector<const void*, 32> IdealInitKeys; |
5291 | |
5292 | const CXXRecordDecl *ClassDecl = Constructor->getParent(); |
5293 | |
5294 | // 1. Virtual bases. |
5295 | for (const auto &VBase : ClassDecl->vbases()) |
5296 | IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase.getType())); |
5297 | |
5298 | // 2. Non-virtual bases. |
5299 | for (const auto &Base : ClassDecl->bases()) { |
5300 | if (Base.isVirtual()) |
5301 | continue; |
5302 | IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base.getType())); |
5303 | } |
5304 | |
5305 | // 3. Direct fields. |
5306 | for (auto *Field : ClassDecl->fields()) { |
5307 | if (Field->isUnnamedBitfield()) |
5308 | continue; |
5309 | |
5310 | PopulateKeysForFields(Field, IdealInitKeys); |
5311 | } |
5312 | |
5313 | unsigned NumIdealInits = IdealInitKeys.size(); |
5314 | unsigned IdealIndex = 0; |
5315 | |
5316 | // Track initializers that are in an incorrect order for either a warning or |
5317 | // note if multiple ones occur. |
5318 | SmallVector<unsigned> WarnIndexes; |
5319 | // Correlates the index of an initializer in the init-list to the index of |
5320 | // the field/base in the class. |
5321 | SmallVector<std::pair<unsigned, unsigned>, 32> CorrelatedInitOrder; |
5322 | |
5323 | for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { |
5324 | const void *InitKey = GetKeyForMember(SemaRef.Context, Inits[InitIndex]); |
5325 | |
5326 | // Scan forward to try to find this initializer in the idealized |
5327 | // initializers list. |
5328 | for (; IdealIndex != NumIdealInits; ++IdealIndex) |
5329 | if (InitKey == IdealInitKeys[IdealIndex]) |
5330 | break; |
5331 | |
5332 | // If we didn't find this initializer, it must be because we |
5333 | // scanned past it on a previous iteration. That can only |
5334 | // happen if we're out of order; emit a warning. |
5335 | if (IdealIndex == NumIdealInits && InitIndex) { |
5336 | WarnIndexes.push_back(InitIndex); |
5337 | |
5338 | // Move back to the initializer's location in the ideal list. |
5339 | for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) |
5340 | if (InitKey == IdealInitKeys[IdealIndex]) |
5341 | break; |
5342 | |
5343 | assert(IdealIndex < NumIdealInits &&((void)0) |
5344 | "initializer not found in initializer list")((void)0); |
5345 | } |
5346 | CorrelatedInitOrder.emplace_back(IdealIndex, InitIndex); |
5347 | } |
5348 | |
5349 | if (WarnIndexes.empty()) |
5350 | return; |
5351 | |
5352 | // Sort based on the ideal order, first in the pair. |
5353 | llvm::sort(CorrelatedInitOrder, |
5354 | [](auto &LHS, auto &RHS) { return LHS.first < RHS.first; }); |
5355 | |
5356 | // Introduce a new scope as SemaDiagnosticBuilder needs to be destroyed to |
5357 | // emit the diagnostic before we can try adding notes. |
5358 | { |
5359 | Sema::SemaDiagnosticBuilder D = SemaRef.Diag( |
5360 | Inits[WarnIndexes.front() - 1]->getSourceLocation(), |
5361 | WarnIndexes.size() == 1 ? diag::warn_initializer_out_of_order |
5362 | : diag::warn_some_initializers_out_of_order); |
5363 | |
5364 | for (unsigned I = 0; I < CorrelatedInitOrder.size(); ++I) { |
5365 | if (CorrelatedInitOrder[I].second == I) |
5366 | continue; |
5367 | // Ideally we would be using InsertFromRange here, but clang doesn't |
5368 | // appear to handle InsertFromRange correctly when the source range is |
5369 | // modified by another fix-it. |
5370 | D << FixItHint::CreateReplacement( |
5371 | Inits[I]->getSourceRange(), |
5372 | Lexer::getSourceText( |
5373 | CharSourceRange::getTokenRange( |
5374 | Inits[CorrelatedInitOrder[I].second]->getSourceRange()), |
5375 | SemaRef.getSourceManager(), SemaRef.getLangOpts())); |
5376 | } |
5377 | |
5378 | // If there is only 1 item out of order, the warning expects the name and |
5379 | // type of each being added to it. |
5380 | if (WarnIndexes.size() == 1) { |
5381 | AddInitializerToDiag(D, Inits[WarnIndexes.front() - 1], |
5382 | Inits[WarnIndexes.front()]); |
5383 | return; |
5384 | } |
5385 | } |
5386 | // More than 1 item to warn, create notes letting the user know which ones |
5387 | // are bad. |
5388 | for (unsigned WarnIndex : WarnIndexes) { |
5389 | const clang::CXXCtorInitializer *PrevInit = Inits[WarnIndex - 1]; |
5390 | auto D = SemaRef.Diag(PrevInit->getSourceLocation(), |
5391 | diag::note_initializer_out_of_order); |
5392 | AddInitializerToDiag(D, PrevInit, Inits[WarnIndex]); |
5393 | D << PrevInit->getSourceRange(); |
5394 | } |
5395 | } |
5396 | |
5397 | namespace { |
5398 | bool CheckRedundantInit(Sema &S, |
5399 | CXXCtorInitializer *Init, |
5400 | CXXCtorInitializer *&PrevInit) { |
5401 | if (!PrevInit) { |
5402 | PrevInit = Init; |
5403 | return false; |
5404 | } |
5405 | |
5406 | if (FieldDecl *Field = Init->getAnyMember()) |
5407 | S.Diag(Init->getSourceLocation(), |
5408 | diag::err_multiple_mem_initialization) |
5409 | << Field->getDeclName() |
5410 | << Init->getSourceRange(); |
5411 | else { |
5412 | const Type *BaseClass = Init->getBaseClass(); |
5413 | assert(BaseClass && "neither field nor base")((void)0); |
5414 | S.Diag(Init->getSourceLocation(), |
5415 | diag::err_multiple_base_initialization) |
5416 | << QualType(BaseClass, 0) |
5417 | << Init->getSourceRange(); |
5418 | } |
5419 | S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) |
5420 | << 0 << PrevInit->getSourceRange(); |
5421 | |
5422 | return true; |
5423 | } |
5424 | |
5425 | typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; |
5426 | typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; |
5427 | |
5428 | bool CheckRedundantUnionInit(Sema &S, |
5429 | CXXCtorInitializer *Init, |
5430 | RedundantUnionMap &Unions) { |
5431 | FieldDecl *Field = Init->getAnyMember(); |
5432 | RecordDecl *Parent = Field->getParent(); |
5433 | NamedDecl *Child = Field; |
5434 | |
5435 | while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { |
5436 | if (Parent->isUnion()) { |
5437 | UnionEntry &En = Unions[Parent]; |
5438 | if (En.first && En.first != Child) { |
5439 | S.Diag(Init->getSourceLocation(), |
5440 | diag::err_multiple_mem_union_initialization) |
5441 | << Field->getDeclName() |
5442 | << Init->getSourceRange(); |
5443 | S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) |
5444 | << 0 << En.second->getSourceRange(); |
5445 | return true; |
5446 | } |
5447 | if (!En.first) { |
5448 | En.first = Child; |
5449 | En.second = Init; |
5450 | } |
5451 | if (!Parent->isAnonymousStructOrUnion()) |
5452 | return false; |
5453 | } |
5454 | |
5455 | Child = Parent; |
5456 | Parent = cast<RecordDecl>(Parent->getDeclContext()); |
5457 | } |
5458 | |
5459 | return false; |
5460 | } |
5461 | } // namespace |
5462 | |
5463 | /// ActOnMemInitializers - Handle the member initializers for a constructor. |
5464 | void Sema::ActOnMemInitializers(Decl *ConstructorDecl, |
5465 | SourceLocation ColonLoc, |
5466 | ArrayRef<CXXCtorInitializer*> MemInits, |
5467 | bool AnyErrors) { |
5468 | if (!ConstructorDecl) |
5469 | return; |
5470 | |
5471 | AdjustDeclIfTemplate(ConstructorDecl); |
5472 | |
5473 | CXXConstructorDecl *Constructor |
5474 | = dyn_cast<CXXConstructorDecl>(ConstructorDecl); |
5475 | |
5476 | if (!Constructor) { |
5477 | Diag(ColonLoc, diag::err_only_constructors_take_base_inits); |
5478 | return; |
5479 | } |
5480 | |
5481 | // Mapping for the duplicate initializers check. |
5482 | // For member initializers, this is keyed with a FieldDecl*. |
5483 | // For base initializers, this is keyed with a Type*. |
5484 | llvm::DenseMap<const void *, CXXCtorInitializer *> Members; |
5485 | |
5486 | // Mapping for the inconsistent anonymous-union initializers check. |
5487 | RedundantUnionMap MemberUnions; |
5488 | |
5489 | bool HadError = false; |
5490 | for (unsigned i = 0; i < MemInits.size(); i++) { |
5491 | CXXCtorInitializer *Init = MemInits[i]; |
5492 | |
5493 | // Set the source order index. |
5494 | Init->setSourceOrder(i); |
5495 | |
5496 | if (Init->isAnyMemberInitializer()) { |
5497 | const void *Key = GetKeyForMember(Context, Init); |
5498 | if (CheckRedundantInit(*this, Init, Members[Key]) || |
5499 | CheckRedundantUnionInit(*this, Init, MemberUnions)) |
5500 | HadError = true; |
5501 | } else if (Init->isBaseInitializer()) { |
5502 | const void *Key = GetKeyForMember(Context, Init); |
5503 | if (CheckRedundantInit(*this, Init, Members[Key])) |
5504 | HadError = true; |
5505 | } else { |
5506 | assert(Init->isDelegatingInitializer())((void)0); |
5507 | // This must be the only initializer |
5508 | if (MemInits.size() != 1) { |
5509 | Diag(Init->getSourceLocation(), |
5510 | diag::err_delegating_initializer_alone) |
5511 | << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); |
5512 | // We will treat this as being the only initializer. |
5513 | } |
5514 | SetDelegatingInitializer(Constructor, MemInits[i]); |
5515 | // Return immediately as the initializer is set. |
5516 | return; |
5517 | } |
5518 | } |
5519 | |
5520 | if (HadError) |
5521 | return; |
5522 | |
5523 | DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits); |
5524 | |
5525 | SetCtorInitializers(Constructor, AnyErrors, MemInits); |
5526 | |
5527 | DiagnoseUninitializedFields(*this, Constructor); |
5528 | } |
5529 | |
5530 | void |
5531 | Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, |
5532 | CXXRecordDecl *ClassDecl) { |
5533 | // Ignore dependent contexts. Also ignore unions, since their members never |
5534 | // have destructors implicitly called. |
5535 | if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) |
5536 | return; |
5537 | |
5538 | // FIXME: all the access-control diagnostics are positioned on the |
5539 | // field/base declaration. That's probably good; that said, the |
5540 | // user might reasonably want to know why the destructor is being |
5541 | // emitted, and we currently don't say. |
5542 | |
5543 | // Non-static data members. |
5544 | for (auto *Field : ClassDecl->fields()) { |
5545 | if (Field->isInvalidDecl()) |
5546 | continue; |
5547 | |
5548 | // Don't destroy incomplete or zero-length arrays. |
5549 | if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) |
5550 | continue; |
5551 | |
5552 | QualType FieldType = Context.getBaseElementType(Field->getType()); |
5553 | |
5554 | const RecordType* RT = FieldType->getAs<RecordType>(); |
5555 | if (!RT) |
5556 | continue; |
5557 | |
5558 | CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); |
5559 | if (FieldClassDecl->isInvalidDecl()) |
5560 | continue; |
5561 | if (FieldClassDecl->hasIrrelevantDestructor()) |
5562 | continue; |
5563 | // The destructor for an implicit anonymous union member is never invoked. |
5564 | if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) |
5565 | continue; |
5566 | |
5567 | CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); |
5568 | assert(Dtor && "No dtor found for FieldClassDecl!")((void)0); |
5569 | CheckDestructorAccess(Field->getLocation(), Dtor, |
5570 | PDiag(diag::err_access_dtor_field) |
5571 | << Field->getDeclName() |
5572 | << FieldType); |
5573 | |
5574 | MarkFunctionReferenced(Location, Dtor); |
5575 | DiagnoseUseOfDecl(Dtor, Location); |
5576 | } |
5577 | |
5578 | // We only potentially invoke the destructors of potentially constructed |
5579 | // subobjects. |
5580 | bool VisitVirtualBases = !ClassDecl->isAbstract(); |
5581 | |
5582 | // If the destructor exists and has already been marked used in the MS ABI, |
5583 | // then virtual base destructors have already been checked and marked used. |
5584 | // Skip checking them again to avoid duplicate diagnostics. |
5585 | if (Context.getTargetInfo().getCXXABI().isMicrosoft()) { |
5586 | CXXDestructorDecl *Dtor = ClassDecl->getDestructor(); |
5587 | if (Dtor && Dtor->isUsed()) |
5588 | VisitVirtualBases = false; |
5589 | } |
5590 | |
5591 | llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; |
5592 | |
5593 | // Bases. |
5594 | for (const auto &Base : ClassDecl->bases()) { |
5595 | const RecordType *RT = Base.getType()->getAs<RecordType>(); |
5596 | if (!RT) |
5597 | continue; |
5598 | |
5599 | // Remember direct virtual bases. |
5600 | if (Base.isVirtual()) { |
5601 | if (!VisitVirtualBases) |
5602 | continue; |
5603 | DirectVirtualBases.insert(RT); |
5604 | } |
5605 | |
5606 | CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); |
5607 | // If our base class is invalid, we probably can't get its dtor anyway. |
5608 | if (BaseClassDecl->isInvalidDecl()) |
5609 | continue; |
5610 | if (BaseClassDecl->hasIrrelevantDestructor()) |
5611 | continue; |
5612 | |
5613 | CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); |
5614 | assert(Dtor && "No dtor found for BaseClassDecl!")((void)0); |
5615 | |
5616 | // FIXME: caret should be on the start of the class name |
5617 | CheckDestructorAccess(Base.getBeginLoc(), Dtor, |
5618 | PDiag(diag::err_access_dtor_base) |
5619 | << Base.getType() << Base.getSourceRange(), |
5620 | Context.getTypeDeclType(ClassDecl)); |
5621 | |
5622 | MarkFunctionReferenced(Location, Dtor); |
5623 | DiagnoseUseOfDecl(Dtor, Location); |
5624 | } |
5625 | |
5626 | if (VisitVirtualBases) |
5627 | MarkVirtualBaseDestructorsReferenced(Location, ClassDecl, |
5628 | &DirectVirtualBases); |
5629 | } |
5630 | |
5631 | void Sema::MarkVirtualBaseDestructorsReferenced( |
5632 | SourceLocation Location, CXXRecordDecl *ClassDecl, |
5633 | llvm::SmallPtrSetImpl<const RecordType *> *DirectVirtualBases) { |
5634 | // Virtual bases. |
5635 | for (const auto &VBase : ClassDecl->vbases()) { |
5636 | // Bases are always records in a well-formed non-dependent class. |
5637 | const RecordType *RT = VBase.getType()->castAs<RecordType>(); |
5638 | |
5639 | // Ignore already visited direct virtual bases. |
5640 | if (DirectVirtualBases && DirectVirtualBases->count(RT)) |
5641 | continue; |
5642 | |
5643 | CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); |
5644 | // If our base class is invalid, we probably can't get its dtor anyway. |
5645 | if (BaseClassDecl->isInvalidDecl()) |
5646 | continue; |
5647 | if (BaseClassDecl->hasIrrelevantDestructor()) |
5648 | continue; |
5649 | |
5650 | CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); |
5651 | assert(Dtor && "No dtor found for BaseClassDecl!")((void)0); |
5652 | if (CheckDestructorAccess( |
5653 | ClassDecl->getLocation(), Dtor, |
5654 | PDiag(diag::err_access_dtor_vbase) |
5655 | << Context.getTypeDeclType(ClassDecl) << VBase.getType(), |
5656 | Context.getTypeDeclType(ClassDecl)) == |
5657 | AR_accessible) { |
5658 | CheckDerivedToBaseConversion( |
5659 | Context.getTypeDeclType(ClassDecl), VBase.getType(), |
5660 | diag::err_access_dtor_vbase, 0, ClassDecl->getLocation(), |
5661 | SourceRange(), DeclarationName(), nullptr); |
5662 | } |
5663 | |
5664 | MarkFunctionReferenced(Location, Dtor); |
5665 | DiagnoseUseOfDecl(Dtor, Location); |
5666 | } |
5667 | } |
5668 | |
5669 | void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { |
5670 | if (!CDtorDecl) |
5671 | return; |
5672 | |
5673 | if (CXXConstructorDecl *Constructor |
5674 | = dyn_cast<CXXConstructorDecl>(CDtorDecl)) { |
5675 | SetCtorInitializers(Constructor, /*AnyErrors=*/false); |
5676 | DiagnoseUninitializedFields(*this, Constructor); |
5677 | } |
5678 | } |
5679 | |
5680 | bool Sema::isAbstractType(SourceLocation Loc, QualType T) { |
5681 | if (!getLangOpts().CPlusPlus) |
5682 | return false; |
5683 | |
5684 | const auto *RD = Context.getBaseElementType(T)->getAsCXXRecordDecl(); |
5685 | if (!RD) |
5686 | return false; |
5687 | |
5688 | // FIXME: Per [temp.inst]p1, we are supposed to trigger instantiation of a |
5689 | // class template specialization here, but doing so breaks a lot of code. |
5690 | |
5691 | // We can't answer whether something is abstract until it has a |
5692 | // definition. If it's currently being defined, we'll walk back |
5693 | // over all the declarations when we have a full definition. |
5694 | const CXXRecordDecl *Def = RD->getDefinition(); |
5695 | if (!Def || Def->isBeingDefined()) |
5696 | return false; |
5697 | |
5698 | return RD->isAbstract(); |
5699 | } |
5700 | |
5701 | bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, |
5702 | TypeDiagnoser &Diagnoser) { |
5703 | if (!isAbstractType(Loc, T)) |
5704 | return false; |
5705 | |
5706 | T = Context.getBaseElementType(T); |
5707 | Diagnoser.diagnose(*this, Loc, T); |
5708 | DiagnoseAbstractType(T->getAsCXXRecordDecl()); |
5709 | return true; |
5710 | } |
5711 | |
5712 | void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { |
5713 | // Check if we've already emitted the list of pure virtual functions |
5714 | // for this class. |
5715 | if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) |
5716 | return; |
5717 | |
5718 | // If the diagnostic is suppressed, don't emit the notes. We're only |
5719 | // going to emit them once, so try to attach them to a diagnostic we're |
5720 | // actually going to show. |
5721 | if (Diags.isLastDiagnosticIgnored()) |
5722 | return; |
5723 | |
5724 | CXXFinalOverriderMap FinalOverriders; |
5725 | RD->getFinalOverriders(FinalOverriders); |
5726 | |
5727 | // Keep a set of seen pure methods so we won't diagnose the same method |
5728 | // more than once. |
5729 | llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; |
5730 | |
5731 | for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), |
5732 | MEnd = FinalOverriders.end(); |
5733 | M != MEnd; |
5734 | ++M) { |
5735 | for (OverridingMethods::iterator SO = M->second.begin(), |
5736 | SOEnd = M->second.end(); |
5737 | SO != SOEnd; ++SO) { |
5738 | // C++ [class.abstract]p4: |
5739 | // A class is abstract if it contains or inherits at least one |
5740 | // pure virtual function for which the final overrider is pure |
5741 | // virtual. |
5742 | |
5743 | // |
5744 | if (SO->second.size() != 1) |
5745 | continue; |
5746 | |
5747 | if (!SO->second.front().Method->isPure()) |
5748 | continue; |
5749 | |
5750 | if (!SeenPureMethods.insert(SO->second.front().Method).second) |
5751 | continue; |
5752 | |
5753 | Diag(SO->second.front().Method->getLocation(), |
5754 | diag::note_pure_virtual_function) |
5755 | << SO->second.front().Method->getDeclName() << RD->getDeclName(); |
5756 | } |
5757 | } |
5758 | |
5759 | if (!PureVirtualClassDiagSet) |
5760 | PureVirtualClassDiagSet.reset(new RecordDeclSetTy); |
5761 | PureVirtualClassDiagSet->insert(RD); |
5762 | } |
5763 | |
5764 | namespace { |
5765 | struct AbstractUsageInfo { |
5766 | Sema &S; |
5767 | CXXRecordDecl *Record; |
5768 | CanQualType AbstractType; |
5769 | bool Invalid; |
5770 | |
5771 | AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) |
5772 | : S(S), Record(Record), |
5773 | AbstractType(S.Context.getCanonicalType( |
5774 | S.Context.getTypeDeclType(Record))), |
5775 | Invalid(false) {} |
5776 | |
5777 | void DiagnoseAbstractType() { |
5778 | if (Invalid) return; |
5779 | S.DiagnoseAbstractType(Record); |
5780 | Invalid = true; |
5781 | } |
5782 | |
5783 | void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); |
5784 | }; |
5785 | |
5786 | struct CheckAbstractUsage { |
5787 | AbstractUsageInfo &Info; |
5788 | const NamedDecl *Ctx; |
5789 | |
5790 | CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) |
5791 | : Info(Info), Ctx(Ctx) {} |
5792 | |
5793 | void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { |
5794 | switch (TL.getTypeLocClass()) { |
5795 | #define ABSTRACT_TYPELOC(CLASS, PARENT) |
5796 | #define TYPELOC(CLASS, PARENT) \ |
5797 | case TypeLoc::CLASS: Check(TL.castAs<CLASS##TypeLoc>(), Sel); break; |
5798 | #include "clang/AST/TypeLocNodes.def" |
5799 | } |
5800 | } |
5801 | |
5802 | void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { |
5803 | Visit(TL.getReturnLoc(), Sema::AbstractReturnType); |
5804 | for (unsigned I = 0, E = TL.getNumParams(); I != E; ++I) { |
5805 | if (!TL.getParam(I)) |
5806 | continue; |
5807 | |
5808 | TypeSourceInfo *TSI = TL.getParam(I)->getTypeSourceInfo(); |
5809 | if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); |
5810 | } |
5811 | } |
5812 | |
5813 | void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { |
5814 | Visit(TL.getElementLoc(), Sema::AbstractArrayType); |
5815 | } |
5816 | |
5817 | void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { |
5818 | // Visit the type parameters from a permissive context. |
5819 | for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { |
5820 | TemplateArgumentLoc TAL = TL.getArgLoc(I); |
5821 | if (TAL.getArgument().getKind() == TemplateArgument::Type) |
5822 | if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) |
5823 | Visit(TSI->getTypeLoc(), Sema::AbstractNone); |
5824 | // TODO: other template argument types? |
5825 | } |
5826 | } |
5827 | |
5828 | // Visit pointee types from a permissive context. |
5829 | #define CheckPolymorphic(Type)void Check(Type TL, Sema::AbstractDiagSelID Sel) { Visit(TL.getNextTypeLoc (), Sema::AbstractNone); } \ |
5830 | void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ |
5831 | Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ |
5832 | } |
5833 | CheckPolymorphic(PointerTypeLoc)void Check(PointerTypeLoc TL, Sema::AbstractDiagSelID Sel) { Visit (TL.getNextTypeLoc(), Sema::AbstractNone); } |
5834 | CheckPolymorphic(ReferenceTypeLoc)void Check(ReferenceTypeLoc TL, Sema::AbstractDiagSelID Sel) { Visit(TL.getNextTypeLoc(), Sema::AbstractNone); } |
5835 | CheckPolymorphic(MemberPointerTypeLoc)void Check(MemberPointerTypeLoc TL, Sema::AbstractDiagSelID Sel ) { Visit(TL.getNextTypeLoc(), Sema::AbstractNone); } |
5836 | CheckPolymorphic(BlockPointerTypeLoc)void Check(BlockPointerTypeLoc TL, Sema::AbstractDiagSelID Sel ) { Visit(TL.getNextTypeLoc(), Sema::AbstractNone); } |
5837 | CheckPolymorphic(AtomicTypeLoc)void Check(AtomicTypeLoc TL, Sema::AbstractDiagSelID Sel) { Visit (TL.getNextTypeLoc(), Sema::AbstractNone); } |
5838 | |
5839 | /// Handle all the types we haven't given a more specific |
5840 | /// implementation for above. |
5841 | void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { |
5842 | // Every other kind of type that we haven't called out already |
5843 | // that has an inner type is either (1) sugar or (2) contains that |
5844 | // inner type in some way as a subobject. |
5845 | if (TypeLoc Next = TL.getNextTypeLoc()) |
5846 | return Visit(Next, Sel); |
5847 | |
5848 | // If there's no inner type and we're in a permissive context, |
5849 | // don't diagnose. |
5850 | if (Sel == Sema::AbstractNone) return; |
5851 | |
5852 | // Check whether the type matches the abstract type. |
5853 | QualType T = TL.getType(); |
5854 | if (T->isArrayType()) { |
5855 | Sel = Sema::AbstractArrayType; |
5856 | T = Info.S.Context.getBaseElementType(T); |
5857 | } |
5858 | CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); |
5859 | if (CT != Info.AbstractType) return; |
5860 | |
5861 | // It matched; do some magic. |
5862 | if (Sel == Sema::AbstractArrayType) { |
5863 | Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) |
5864 | << T << TL.getSourceRange(); |
5865 | } else { |
5866 | Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) |
5867 | << Sel << T << TL.getSourceRange(); |
5868 | } |
5869 | Info.DiagnoseAbstractType(); |
5870 | } |
5871 | }; |
5872 | |
5873 | void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, |
5874 | Sema::AbstractDiagSelID Sel) { |
5875 | CheckAbstractUsage(*this, D).Visit(TL, Sel); |
5876 | } |
5877 | |
5878 | } |
5879 | |
5880 | /// Check for invalid uses of an abstract type in a method declaration. |
5881 | static void CheckAbstractClassUsage(AbstractUsageInfo &Info, |
5882 | CXXMethodDecl *MD) { |
5883 | // No need to do the check on definitions, which require that |
5884 | // the return/param types be complete. |
5885 | if (MD->doesThisDeclarationHaveABody()) |
5886 | return; |
5887 | |
5888 | // For safety's sake, just ignore it if we don't have type source |
5889 | // information. This should never happen for non-implicit methods, |
5890 | // but... |
5891 | if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) |
5892 | Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); |
5893 | } |
5894 | |
5895 | /// Check for invalid uses of an abstract type within a class definition. |
5896 | static void CheckAbstractClassUsage(AbstractUsageInfo &Info, |
5897 | CXXRecordDecl *RD) { |
5898 | for (auto *D : RD->decls()) { |
5899 | if (D->isImplicit()) continue; |
5900 | |
5901 | // Methods and method templates. |
5902 | if (isa<CXXMethodDecl>(D)) { |
5903 | CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); |
5904 | } else if (isa<FunctionTemplateDecl>(D)) { |
5905 | FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); |
5906 | CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); |
5907 | |
5908 | // Fields and static variables. |
5909 | } else if (isa<FieldDecl>(D)) { |
5910 | FieldDecl *FD = cast<FieldDecl>(D); |
5911 | if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) |
5912 | Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); |
5913 | } else if (isa<VarDecl>(D)) { |
5914 | VarDecl *VD = cast<VarDecl>(D); |
5915 | if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) |
5916 | Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); |
5917 | |
5918 | // Nested classes and class templates. |
5919 | } else if (isa<CXXRecordDecl>(D)) { |
5920 | CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); |
5921 | } else if (isa<ClassTemplateDecl>(D)) { |
5922 | CheckAbstractClassUsage(Info, |
5923 | cast<ClassTemplateDecl>(D)->getTemplatedDecl()); |
5924 | } |
5925 | } |
5926 | } |
5927 | |
5928 | static void ReferenceDllExportedMembers(Sema &S, CXXRecordDecl *Class) { |
5929 | Attr *ClassAttr = getDLLAttr(Class); |
5930 | if (!ClassAttr) |
5931 | return; |
5932 | |
5933 | assert(ClassAttr->getKind() == attr::DLLExport)((void)0); |
5934 | |
5935 | TemplateSpecializationKind TSK = Class->getTemplateSpecializationKind(); |
5936 | |
5937 | if (TSK == TSK_ExplicitInstantiationDeclaration) |
5938 | // Don't go any further if this is just an explicit instantiation |
5939 | // declaration. |
5940 | return; |
5941 | |
5942 | // Add a context note to explain how we got to any diagnostics produced below. |
5943 | struct MarkingClassDllexported { |
5944 | Sema &S; |
5945 | MarkingClassDllexported(Sema &S, CXXRecordDecl *Class, |
5946 | SourceLocation AttrLoc) |
5947 | : S(S) { |
5948 | Sema::CodeSynthesisContext Ctx; |
5949 | Ctx.Kind = Sema::CodeSynthesisContext::MarkingClassDllexported; |
5950 | Ctx.PointOfInstantiation = AttrLoc; |
5951 | Ctx.Entity = Class; |
5952 | S.pushCodeSynthesisContext(Ctx); |
5953 | } |
5954 | ~MarkingClassDllexported() { |
5955 | S.popCodeSynthesisContext(); |
5956 | } |
5957 | } MarkingDllexportedContext(S, Class, ClassAttr->getLocation()); |
5958 | |
5959 | if (S.Context.getTargetInfo().getTriple().isWindowsGNUEnvironment()) |
5960 | S.MarkVTableUsed(Class->getLocation(), Class, true); |
5961 | |
5962 | for (Decl *Member : Class->decls()) { |
5963 | // Defined static variables that are members of an exported base |
5964 | // class must be marked export too. |
5965 | auto *VD = dyn_cast<VarDecl>(Member); |
5966 | if (VD && Member->getAttr<DLLExportAttr>() && |
5967 | VD->getStorageClass() == SC_Static && |
5968 | TSK == TSK_ImplicitInstantiation) |
5969 | S.MarkVariableReferenced(VD->getLocation(), VD); |
5970 | |
5971 | auto *MD = dyn_cast<CXXMethodDecl>(Member); |
5972 | if (!MD) |
5973 | continue; |
5974 | |
5975 | if (Member->getAttr<DLLExportAttr>()) { |
5976 | if (MD->isUserProvided()) { |
5977 | // Instantiate non-default class member functions ... |
5978 | |
5979 | // .. except for certain kinds of template specializations. |
5980 | if (TSK == TSK_ImplicitInstantiation && !ClassAttr->isInherited()) |
5981 | continue; |
5982 | |
5983 | S.MarkFunctionReferenced(Class->getLocation(), MD); |
5984 | |
5985 | // The function will be passed to the consumer when its definition is |
5986 | // encountered. |
5987 | } else if (MD->isExplicitlyDefaulted()) { |
5988 | // Synthesize and instantiate explicitly defaulted methods. |
5989 | S.MarkFunctionReferenced(Class->getLocation(), MD); |
5990 | |
5991 | if (TSK != TSK_ExplicitInstantiationDefinition) { |
5992 | // Except for explicit instantiation defs, we will not see the |
5993 | // definition again later, so pass it to the consumer now. |
5994 | S.Consumer.HandleTopLevelDecl(DeclGroupRef(MD)); |
5995 | } |
5996 | } else if (!MD->isTrivial() || |
5997 | MD->isCopyAssignmentOperator() || |
5998 | MD->isMoveAssignmentOperator()) { |
5999 | // Synthesize and instantiate non-trivial implicit methods, and the copy |
6000 | // and move assignment operators. The latter are exported even if they |
6001 | // are trivial, because the address of an operator can be taken and |
6002 | // should compare equal across libraries. |
6003 | S.MarkFunctionReferenced(Class->getLocation(), MD); |
6004 | |
6005 | // There is no later point when we will see the definition of this |
6006 | // function, so pass it to the consumer now. |
6007 | S.Consumer.HandleTopLevelDecl(DeclGroupRef(MD)); |
6008 | } |
6009 | } |
6010 | } |
6011 | } |
6012 | |
6013 | static void checkForMultipleExportedDefaultConstructors(Sema &S, |
6014 | CXXRecordDecl *Class) { |
6015 | // Only the MS ABI has default constructor closures, so we don't need to do |
6016 | // this semantic checking anywhere else. |
6017 | if (!S.Context.getTargetInfo().getCXXABI().isMicrosoft()) |
6018 | return; |
6019 | |
6020 | CXXConstructorDecl *LastExportedDefaultCtor = nullptr; |
6021 | for (Decl *Member : Class->decls()) { |
6022 | // Look for exported default constructors. |
6023 | auto *CD = dyn_cast<CXXConstructorDecl>(Member); |
6024 | if (!CD || !CD->isDefaultConstructor()) |
6025 | continue; |
6026 | auto *Attr = CD->getAttr<DLLExportAttr>(); |
6027 | if (!Attr) |
6028 | continue; |
6029 | |
6030 | // If the class is non-dependent, mark the default arguments as ODR-used so |
6031 | // that we can properly codegen the constructor closure. |
6032 | if (!Class->isDependentContext()) { |
6033 | for (ParmVarDecl *PD : CD->parameters()) { |
6034 | (void)S.CheckCXXDefaultArgExpr(Attr->getLocation(), CD, PD); |
6035 | S.DiscardCleanupsInEvaluationContext(); |
6036 | } |
6037 | } |
6038 | |
6039 | if (LastExportedDefaultCtor) { |
6040 | S.Diag(LastExportedDefaultCtor->getLocation(), |
6041 | diag::err_attribute_dll_ambiguous_default_ctor) |
6042 | << Class; |
6043 | S.Diag(CD->getLocation(), diag::note_entity_declared_at) |
6044 | << CD->getDeclName(); |
6045 | return; |
6046 | } |
6047 | LastExportedDefaultCtor = CD; |
6048 | } |
6049 | } |
6050 | |
6051 | static void checkCUDADeviceBuiltinSurfaceClassTemplate(Sema &S, |
6052 | CXXRecordDecl *Class) { |
6053 | bool ErrorReported = false; |
6054 | auto reportIllegalClassTemplate = [&ErrorReported](Sema &S, |
6055 | ClassTemplateDecl *TD) { |
6056 | if (ErrorReported) |
6057 | return; |
6058 | S.Diag(TD->getLocation(), |
6059 | diag::err_cuda_device_builtin_surftex_cls_template) |
6060 | << /*surface*/ 0 << TD; |
6061 | ErrorReported = true; |
6062 | }; |
6063 | |
6064 | ClassTemplateDecl *TD = Class->getDescribedClassTemplate(); |
6065 | if (!TD) { |
6066 | auto *SD = dyn_cast<ClassTemplateSpecializationDecl>(Class); |
6067 | if (!SD) { |
6068 | S.Diag(Class->getLocation(), |
6069 | diag::err_cuda_device_builtin_surftex_ref_decl) |
6070 | << /*surface*/ 0 << Class; |
6071 | S.Diag(Class->getLocation(), |
6072 | diag::note_cuda_device_builtin_surftex_should_be_template_class) |
6073 | << Class; |
6074 | return; |
6075 | } |
6076 | TD = SD->getSpecializedTemplate(); |
6077 | } |
6078 | |
6079 | TemplateParameterList *Params = TD->getTemplateParameters(); |
6080 | unsigned N = Params->size(); |
6081 | |
6082 | if (N != 2) { |
6083 | reportIllegalClassTemplate(S, TD); |
6084 | S.Diag(TD->getLocation(), |
6085 | diag::note_cuda_device_builtin_surftex_cls_should_have_n_args) |
6086 | << TD << 2; |
6087 | } |
6088 | if (N > 0 && !isa<TemplateTypeParmDecl>(Params->getParam(0))) { |
6089 | reportIllegalClassTemplate(S, TD); |
6090 | S.Diag(TD->getLocation(), |
6091 | diag::note_cuda_device_builtin_surftex_cls_should_have_match_arg) |
6092 | << TD << /*1st*/ 0 << /*type*/ 0; |
6093 | } |
6094 | if (N > 1) { |
6095 | auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(1)); |
6096 | if (!NTTP || !NTTP->getType()->isIntegralOrEnumerationType()) { |
6097 | reportIllegalClassTemplate(S, TD); |
6098 | S.Diag(TD->getLocation(), |
6099 | diag::note_cuda_device_builtin_surftex_cls_should_have_match_arg) |
6100 | << TD << /*2nd*/ 1 << /*integer*/ 1; |
6101 | } |
6102 | } |
6103 | } |
6104 | |
6105 | static void checkCUDADeviceBuiltinTextureClassTemplate(Sema &S, |
6106 | CXXRecordDecl *Class) { |
6107 | bool ErrorReported = false; |
6108 | auto reportIllegalClassTemplate = [&ErrorReported](Sema &S, |
6109 | ClassTemplateDecl *TD) { |
6110 | if (ErrorReported) |
6111 | return; |
6112 | S.Diag(TD->getLocation(), |
6113 | diag::err_cuda_device_builtin_surftex_cls_template) |
6114 | << /*texture*/ 1 << TD; |
6115 | ErrorReported = true; |
6116 | }; |
6117 | |
6118 | ClassTemplateDecl *TD = Class->getDescribedClassTemplate(); |
6119 | if (!TD) { |
6120 | auto *SD = dyn_cast<ClassTemplateSpecializationDecl>(Class); |
6121 | if (!SD) { |
6122 | S.Diag(Class->getLocation(), |
6123 | diag::err_cuda_device_builtin_surftex_ref_decl) |
6124 | << /*texture*/ 1 << Class; |
6125 | S.Diag(Class->getLocation(), |
6126 | diag::note_cuda_device_builtin_surftex_should_be_template_class) |
6127 | << Class; |
6128 | return; |
6129 | } |
6130 | TD = SD->getSpecializedTemplate(); |
6131 | } |
6132 | |
6133 | TemplateParameterList *Params = TD->getTemplateParameters(); |
6134 | unsigned N = Params->size(); |
6135 | |
6136 | if (N != 3) { |
6137 | reportIllegalClassTemplate(S, TD); |
6138 | S.Diag(TD->getLocation(), |
6139 | diag::note_cuda_device_builtin_surftex_cls_should_have_n_args) |
6140 | << TD << 3; |
6141 | } |
6142 | if (N > 0 && !isa<TemplateTypeParmDecl>(Params->getParam(0))) { |
6143 | reportIllegalClassTemplate(S, TD); |
6144 | S.Diag(TD->getLocation(), |
6145 | diag::note_cuda_device_builtin_surftex_cls_should_have_match_arg) |
6146 | << TD << /*1st*/ 0 << /*type*/ 0; |
6147 | } |
6148 | if (N > 1) { |
6149 | auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(1)); |
6150 | if (!NTTP || !NTTP->getType()->isIntegralOrEnumerationType()) { |
6151 | reportIllegalClassTemplate(S, TD); |
6152 | S.Diag(TD->getLocation(), |
6153 | diag::note_cuda_device_builtin_surftex_cls_should_have_match_arg) |
6154 | << TD << /*2nd*/ 1 << /*integer*/ 1; |
6155 | } |
6156 | } |
6157 | if (N > 2) { |
6158 | auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(2)); |
6159 | if (!NTTP || !NTTP->getType()->isIntegralOrEnumerationType()) { |
6160 | reportIllegalClassTemplate(S, TD); |
6161 | S.Diag(TD->getLocation(), |
6162 | diag::note_cuda_device_builtin_surftex_cls_should_have_match_arg) |
6163 | << TD << /*3rd*/ 2 << /*integer*/ 1; |
6164 | } |
6165 | } |
6166 | } |
6167 | |
6168 | void Sema::checkClassLevelCodeSegAttribute(CXXRecordDecl *Class) { |
6169 | // Mark any compiler-generated routines with the implicit code_seg attribute. |
6170 | for (auto *Method : Class->methods()) { |
6171 | if (Method->isUserProvided()) |
6172 | continue; |
6173 | if (Attr *A = getImplicitCodeSegOrSectionAttrForFunction(Method, /*IsDefinition=*/true)) |
6174 | Method->addAttr(A); |
6175 | } |
6176 | } |
6177 | |
6178 | /// Check class-level dllimport/dllexport attribute. |
6179 | void Sema::checkClassLevelDLLAttribute(CXXRecordDecl *Class) { |
6180 | Attr *ClassAttr = getDLLAttr(Class); |
6181 | |
6182 | // MSVC inherits DLL attributes to partial class template specializations. |
6183 | if (Context.getTargetInfo().shouldDLLImportComdatSymbols() && !ClassAttr) { |
6184 | if (auto *Spec = dyn_cast<ClassTemplatePartialSpecializationDecl>(Class)) { |
6185 | if (Attr *TemplateAttr = |
6186 | getDLLAttr(Spec->getSpecializedTemplate()->getTemplatedDecl())) { |
6187 | auto *A = cast<InheritableAttr>(TemplateAttr->clone(getASTContext())); |
6188 | A->setInherited(true); |
6189 | ClassAttr = A; |
6190 | } |
6191 | } |
6192 | } |
6193 | |
6194 | if (!ClassAttr) |
6195 | return; |
6196 | |
6197 | if (!Class->isExternallyVisible()) { |
6198 | Diag(Class->getLocation(), diag::err_attribute_dll_not_extern) |
6199 | << Class << ClassAttr; |
6200 | return; |
6201 | } |
6202 | |
6203 | if (Context.getTargetInfo().shouldDLLImportComdatSymbols() && |
6204 | !ClassAttr->isInherited()) { |
6205 | // Diagnose dll attributes on members of class with dll attribute. |
6206 | for (Decl *Member : Class->decls()) { |
6207 | if (!isa<VarDecl>(Member) && !isa<CXXMethodDecl>(Member)) |
6208 | continue; |
6209 | InheritableAttr *MemberAttr = getDLLAttr(Member); |
6210 | if (!MemberAttr || MemberAttr->isInherited() || Member->isInvalidDecl()) |
6211 | continue; |
6212 | |
6213 | Diag(MemberAttr->getLocation(), |
6214 | diag::err_attribute_dll_member_of_dll_class) |
6215 | << MemberAttr << ClassAttr; |
6216 | Diag(ClassAttr->getLocation(), diag::note_previous_attribute); |
6217 | Member->setInvalidDecl(); |
6218 | } |
6219 | } |
6220 | |
6221 | if (Class->getDescribedClassTemplate()) |
6222 | // Don't inherit dll attribute until the template is instantiated. |
6223 | return; |
6224 | |
6225 | // The class is either imported or exported. |
6226 | const bool ClassExported = ClassAttr->getKind() == attr::DLLExport; |
6227 | |
6228 | // Check if this was a dllimport attribute propagated from a derived class to |
6229 | // a base class template specialization. We don't apply these attributes to |
6230 | // static data members. |
6231 | const bool PropagatedImport = |
6232 | !ClassExported && |
6233 | cast<DLLImportAttr>(ClassAttr)->wasPropagatedToBaseTemplate(); |
6234 | |
6235 | TemplateSpecializationKind TSK = Class->getTemplateSpecializationKind(); |
6236 | |
6237 | // Ignore explicit dllexport on explicit class template instantiation |
6238 | // declarations, except in MinGW mode. |
6239 | if (ClassExported && !ClassAttr->isInherited() && |
6240 | TSK == TSK_ExplicitInstantiationDeclaration && |
6241 | !Context.getTargetInfo().getTriple().isWindowsGNUEnvironment()) { |
6242 | Class->dropAttr<DLLExportAttr>(); |
6243 | return; |
6244 | } |
6245 | |
6246 | // Force declaration of implicit members so they can inherit the attribute. |
6247 | ForceDeclarationOfImplicitMembers(Class); |
6248 | |
6249 | // FIXME: MSVC's docs say all bases must be exportable, but this doesn't |
6250 | // seem to be true in practice? |
6251 | |
6252 | for (Decl *Member : Class->decls()) { |
6253 | VarDecl *VD = dyn_cast<VarDecl>(Member); |
6254 | CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Member); |
6255 | |
6256 | // Only methods and static fields inherit the attributes. |
6257 | if (!VD && !MD) |
6258 | continue; |
6259 | |
6260 | if (MD) { |
6261 | // Don't process deleted methods. |
6262 | if (MD->isDeleted()) |
6263 | continue; |
6264 | |
6265 | if (MD->isInlined()) { |
6266 | // MinGW does not import or export inline methods. But do it for |
6267 | // template instantiations. |
6268 | if (!Context.getTargetInfo().shouldDLLImportComdatSymbols() && |
6269 | TSK != TSK_ExplicitInstantiationDeclaration && |
6270 | TSK != TSK_ExplicitInstantiationDefinition) |
6271 | continue; |
6272 | |
6273 | // MSVC versions before 2015 don't export the move assignment operators |
6274 | // and move constructor, so don't attempt to import/export them if |
6275 | // we have a definition. |
6276 | auto *Ctor = dyn_cast<CXXConstructorDecl>(MD); |
6277 | if ((MD->isMoveAssignmentOperator() || |
6278 | (Ctor && Ctor->isMoveConstructor())) && |
6279 | !getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015)) |
6280 | continue; |
6281 | |
6282 | // MSVC2015 doesn't export trivial defaulted x-tor but copy assign |
6283 | // operator is exported anyway. |
6284 | if (getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015) && |
6285 | (Ctor || isa<CXXDestructorDecl>(MD)) && MD->isTrivial()) |
6286 | continue; |
6287 | } |
6288 | } |
6289 | |
6290 | // Don't apply dllimport attributes to static data members of class template |
6291 | // instantiations when the attribute is propagated from a derived class. |
6292 | if (VD && PropagatedImport) |
6293 | continue; |
6294 | |
6295 | if (!cast<NamedDecl>(Member)->isExternallyVisible()) |
6296 | continue; |
6297 | |
6298 | if (!getDLLAttr(Member)) { |
6299 | InheritableAttr *NewAttr = nullptr; |
6300 | |
6301 | // Do not export/import inline function when -fno-dllexport-inlines is |
6302 | // passed. But add attribute for later local static var check. |
6303 | if (!getLangOpts().DllExportInlines && MD && MD->isInlined() && |
6304 | TSK != TSK_ExplicitInstantiationDeclaration && |
6305 | TSK != TSK_ExplicitInstantiationDefinition) { |
6306 | if (ClassExported) { |
6307 | NewAttr = ::new (getASTContext()) |
6308 | DLLExportStaticLocalAttr(getASTContext(), *ClassAttr); |
6309 | } else { |
6310 | NewAttr = ::new (getASTContext()) |
6311 | DLLImportStaticLocalAttr(getASTContext(), *ClassAttr); |
6312 | } |
6313 | } else { |
6314 | NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext())); |
6315 | } |
6316 | |
6317 | NewAttr->setInherited(true); |
6318 | Member->addAttr(NewAttr); |
6319 | |
6320 | if (MD) { |
6321 | // Propagate DLLAttr to friend re-declarations of MD that have already |
6322 | // been constructed. |
6323 | for (FunctionDecl *FD = MD->getMostRecentDecl(); FD; |
6324 | FD = FD->getPreviousDecl()) { |
6325 | if (FD->getFriendObjectKind() == Decl::FOK_None) |
6326 | continue; |
6327 | assert(!getDLLAttr(FD) &&((void)0) |
6328 | "friend re-decl should not already have a DLLAttr")((void)0); |
6329 | NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext())); |
6330 | NewAttr->setInherited(true); |
6331 | FD->addAttr(NewAttr); |
6332 | } |
6333 | } |
6334 | } |
6335 | } |
6336 | |
6337 | if (ClassExported) |
6338 | DelayedDllExportClasses.push_back(Class); |
6339 | } |
6340 | |
6341 | /// Perform propagation of DLL attributes from a derived class to a |
6342 | /// templated base class for MS compatibility. |
6343 | void Sema::propagateDLLAttrToBaseClassTemplate( |
6344 | CXXRecordDecl *Class, Attr *ClassAttr, |
6345 | ClassTemplateSpecializationDecl *BaseTemplateSpec, SourceLocation BaseLoc) { |
6346 | if (getDLLAttr( |
6347 | BaseTemplateSpec->getSpecializedTemplate()->getTemplatedDecl())) { |
6348 | // If the base class template has a DLL attribute, don't try to change it. |
6349 | return; |
6350 | } |
6351 | |
6352 | auto TSK = BaseTemplateSpec->getSpecializationKind(); |
6353 | if (!getDLLAttr(BaseTemplateSpec) && |
6354 | (TSK == TSK_Undeclared || TSK == TSK_ExplicitInstantiationDeclaration || |
6355 | TSK == TSK_ImplicitInstantiation)) { |
6356 | // The template hasn't been instantiated yet (or it has, but only as an |
6357 | // explicit instantiation declaration or implicit instantiation, which means |
6358 | // we haven't codegenned any members yet), so propagate the attribute. |
6359 | auto *NewAttr = cast<InheritableAttr>(ClassAttr->clone(getASTContext())); |
6360 | NewAttr->setInherited(true); |
6361 | BaseTemplateSpec->addAttr(NewAttr); |
6362 | |
6363 | // If this was an import, mark that we propagated it from a derived class to |
6364 | // a base class template specialization. |
6365 | if (auto *ImportAttr = dyn_cast<DLLImportAttr>(NewAttr)) |
6366 | ImportAttr->setPropagatedToBaseTemplate(); |
6367 | |
6368 | // If the template is already instantiated, checkDLLAttributeRedeclaration() |
6369 | // needs to be run again to work see the new attribute. Otherwise this will |
6370 | // get run whenever the template is instantiated. |
6371 | if (TSK != TSK_Undeclared) |
6372 | checkClassLevelDLLAttribute(BaseTemplateSpec); |
6373 | |
6374 | return; |
6375 | } |
6376 | |
6377 | if (getDLLAttr(BaseTemplateSpec)) { |
6378 | // The template has already been specialized or instantiated with an |
6379 | // attribute, explicitly or through propagation. We should not try to change |
6380 | // it. |
6381 | return; |
6382 | } |
6383 | |
6384 | // The template was previously instantiated or explicitly specialized without |
6385 | // a dll attribute, It's too late for us to add an attribute, so warn that |
6386 | // this is unsupported. |
6387 | Diag(BaseLoc, diag::warn_attribute_dll_instantiated_base_class) |
6388 | << BaseTemplateSpec->isExplicitSpecialization(); |
6389 | Diag(ClassAttr->getLocation(), diag::note_attribute); |
6390 | if (BaseTemplateSpec->isExplicitSpecialization()) { |
6391 | Diag(BaseTemplateSpec->getLocation(), |
6392 | diag::note_template_class_explicit_specialization_was_here) |
6393 | << BaseTemplateSpec; |
6394 | } else { |
6395 | Diag(BaseTemplateSpec->getPointOfInstantiation(), |
6396 | diag::note_template_class_instantiation_was_here) |
6397 | << BaseTemplateSpec; |
6398 | } |
6399 | } |
6400 | |
6401 | /// Determine the kind of defaulting that would be done for a given function. |
6402 | /// |
6403 | /// If the function is both a default constructor and a copy / move constructor |
6404 | /// (due to having a default argument for the first parameter), this picks |
6405 | /// CXXDefaultConstructor. |
6406 | /// |
6407 | /// FIXME: Check that case is properly handled by all callers. |
6408 | Sema::DefaultedFunctionKind |
6409 | Sema::getDefaultedFunctionKind(const FunctionDecl *FD) { |
6410 | if (auto *MD = dyn_cast<CXXMethodDecl>(FD)) { |
6411 | if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(FD)) { |
6412 | if (Ctor->isDefaultConstructor()) |
6413 | return Sema::CXXDefaultConstructor; |
6414 | |
6415 | if (Ctor->isCopyConstructor()) |
6416 | return Sema::CXXCopyConstructor; |
6417 | |
6418 | if (Ctor->isMoveConstructor()) |
6419 | return Sema::CXXMoveConstructor; |
6420 | } |
6421 | |
6422 | if (MD->isCopyAssignmentOperator()) |
6423 | return Sema::CXXCopyAssignment; |
6424 | |
6425 | if (MD->isMoveAssignmentOperator()) |
6426 | return Sema::CXXMoveAssignment; |
6427 | |
6428 | if (isa<CXXDestructorDecl>(FD)) |
6429 | return Sema::CXXDestructor; |
6430 | } |
6431 | |
6432 | switch (FD->getDeclName().getCXXOverloadedOperator()) { |
6433 | case OO_EqualEqual: |
6434 | return DefaultedComparisonKind::Equal; |
6435 | |
6436 | case OO_ExclaimEqual: |
6437 | return DefaultedComparisonKind::NotEqual; |
6438 | |
6439 | case OO_Spaceship: |
6440 | // No point allowing this if <=> doesn't exist in the current language mode. |
6441 | if (!getLangOpts().CPlusPlus20) |
6442 | break; |
6443 | return DefaultedComparisonKind::ThreeWay; |
6444 | |
6445 | case OO_Less: |
6446 | case OO_LessEqual: |
6447 | case OO_Greater: |
6448 | case OO_GreaterEqual: |
6449 | // No point allowing this if <=> doesn't exist in the current language mode. |
6450 | if (!getLangOpts().CPlusPlus20) |
6451 | break; |
6452 | return DefaultedComparisonKind::Relational; |
6453 | |
6454 | default: |
6455 | break; |
6456 | } |
6457 | |
6458 | // Not defaultable. |
6459 | return DefaultedFunctionKind(); |
6460 | } |
6461 | |
6462 | static void DefineDefaultedFunction(Sema &S, FunctionDecl *FD, |
6463 | SourceLocation DefaultLoc) { |
6464 | Sema::DefaultedFunctionKind DFK = S.getDefaultedFunctionKind(FD); |
6465 | if (DFK.isComparison()) |
6466 | return S.DefineDefaultedComparison(DefaultLoc, FD, DFK.asComparison()); |
6467 | |
6468 | switch (DFK.asSpecialMember()) { |
6469 | case Sema::CXXDefaultConstructor: |
6470 | S.DefineImplicitDefaultConstructor(DefaultLoc, |
6471 | cast<CXXConstructorDecl>(FD)); |
6472 | break; |
6473 | case Sema::CXXCopyConstructor: |
6474 | S.DefineImplicitCopyConstructor(DefaultLoc, cast<CXXConstructorDecl>(FD)); |
6475 | break; |
6476 | case Sema::CXXCopyAssignment: |
6477 | S.DefineImplicitCopyAssignment(DefaultLoc, cast<CXXMethodDecl>(FD)); |
6478 | break; |
6479 | case Sema::CXXDestructor: |
6480 | S.DefineImplicitDestructor(DefaultLoc, cast<CXXDestructorDecl>(FD)); |
6481 | break; |
6482 | case Sema::CXXMoveConstructor: |
6483 | S.DefineImplicitMoveConstructor(DefaultLoc, cast<CXXConstructorDecl>(FD)); |
6484 | break; |
6485 | case Sema::CXXMoveAssignment: |
6486 | S.DefineImplicitMoveAssignment(DefaultLoc, cast<CXXMethodDecl>(FD)); |
6487 | break; |
6488 | case Sema::CXXInvalid: |
6489 | llvm_unreachable("Invalid special member.")__builtin_unreachable(); |
6490 | } |
6491 | } |
6492 | |
6493 | /// Determine whether a type is permitted to be passed or returned in |
6494 | /// registers, per C++ [class.temporary]p3. |
6495 | static bool canPassInRegisters(Sema &S, CXXRecordDecl *D, |
6496 | TargetInfo::CallingConvKind CCK) { |
6497 | if (D->isDependentType() || D->isInvalidDecl()) |
6498 | return false; |
6499 | |
6500 | // Clang <= 4 used the pre-C++11 rule, which ignores move operations. |
6501 | // The PS4 platform ABI follows the behavior of Clang 3.2. |
6502 | if (CCK == TargetInfo::CCK_ClangABI4OrPS4) |
6503 | return !D->hasNonTrivialDestructorForCall() && |
6504 | !D->hasNonTrivialCopyConstructorForCall(); |
6505 | |
6506 | if (CCK == TargetInfo::CCK_MicrosoftWin64) { |
6507 | bool CopyCtorIsTrivial = false, CopyCtorIsTrivialForCall = false; |
6508 | bool DtorIsTrivialForCall = false; |
6509 | |
6510 | // If a class has at least one non-deleted, trivial copy constructor, it |
6511 | // is passed according to the C ABI. Otherwise, it is passed indirectly. |
6512 | // |
6513 | // Note: This permits classes with non-trivial copy or move ctors to be |
6514 | // passed in registers, so long as they *also* have a trivial copy ctor, |
6515 | // which is non-conforming. |
6516 | if (D->needsImplicitCopyConstructor()) { |
6517 | if (!D->defaultedCopyConstructorIsDeleted()) { |
6518 | if (D->hasTrivialCopyConstructor()) |
6519 | CopyCtorIsTrivial = true; |
6520 | if (D->hasTrivialCopyConstructorForCall()) |
6521 | CopyCtorIsTrivialForCall = true; |
6522 | } |
6523 | } else { |
6524 | for (const CXXConstructorDecl *CD : D->ctors()) { |
6525 | if (CD->isCopyConstructor() && !CD->isDeleted()) { |
6526 | if (CD->isTrivial()) |
6527 | CopyCtorIsTrivial = true; |
6528 | if (CD->isTrivialForCall()) |
6529 | CopyCtorIsTrivialForCall = true; |
6530 | } |
6531 | } |
6532 | } |
6533 | |
6534 | if (D->needsImplicitDestructor()) { |
6535 | if (!D->defaultedDestructorIsDeleted() && |
6536 | D->hasTrivialDestructorForCall()) |
6537 | DtorIsTrivialForCall = true; |
6538 | } else if (const auto *DD = D->getDestructor()) { |
6539 | if (!DD->isDeleted() && DD->isTrivialForCall()) |
6540 | DtorIsTrivialForCall = true; |
6541 | } |
6542 | |
6543 | // If the copy ctor and dtor are both trivial-for-calls, pass direct. |
6544 | if (CopyCtorIsTrivialForCall && DtorIsTrivialForCall) |
6545 | return true; |
6546 | |
6547 | // If a class has a destructor, we'd really like to pass it indirectly |
6548 | // because it allows us to elide copies. Unfortunately, MSVC makes that |
6549 | // impossible for small types, which it will pass in a single register or |
6550 | // stack slot. Most objects with dtors are large-ish, so handle that early. |
6551 | // We can't call out all large objects as being indirect because there are |
6552 | // multiple x64 calling conventions and the C++ ABI code shouldn't dictate |
6553 | // how we pass large POD types. |
6554 | |
6555 | // Note: This permits small classes with nontrivial destructors to be |
6556 | // passed in registers, which is non-conforming. |
6557 | bool isAArch64 = S.Context.getTargetInfo().getTriple().isAArch64(); |
6558 | uint64_t TypeSize = isAArch64 ? 128 : 64; |
6559 | |
6560 | if (CopyCtorIsTrivial && |
6561 | S.getASTContext().getTypeSize(D->getTypeForDecl()) <= TypeSize) |
6562 | return true; |
6563 | return false; |
6564 | } |
6565 | |
6566 | // Per C++ [class.temporary]p3, the relevant condition is: |
6567 | // each copy constructor, move constructor, and destructor of X is |
6568 | // either trivial or deleted, and X has at least one non-deleted copy |
6569 | // or move constructor |
6570 | bool HasNonDeletedCopyOrMove = false; |
6571 | |
6572 | if (D->needsImplicitCopyConstructor() && |
6573 | !D->defaultedCopyConstructorIsDeleted()) { |
6574 | if (!D->hasTrivialCopyConstructorForCall()) |
6575 | return false; |
6576 | HasNonDeletedCopyOrMove = true; |
6577 | } |
6578 | |
6579 | if (S.getLangOpts().CPlusPlus11 && D->needsImplicitMoveConstructor() && |
6580 | !D->defaultedMoveConstructorIsDeleted()) { |
6581 | if (!D->hasTrivialMoveConstructorForCall()) |
6582 | return false; |
6583 | HasNonDeletedCopyOrMove = true; |
6584 | } |
6585 | |
6586 | if (D->needsImplicitDestructor() && !D->defaultedDestructorIsDeleted() && |
6587 | !D->hasTrivialDestructorForCall()) |
6588 | return false; |
6589 | |
6590 | for (const CXXMethodDecl *MD : D->methods()) { |
6591 | if (MD->isDeleted()) |
6592 | continue; |
6593 | |
6594 | auto *CD = dyn_cast<CXXConstructorDecl>(MD); |
6595 | if (CD && CD->isCopyOrMoveConstructor()) |
6596 | HasNonDeletedCopyOrMove = true; |
6597 | else if (!isa<CXXDestructorDecl>(MD)) |
6598 | continue; |
6599 | |
6600 | if (!MD->isTrivialForCall()) |
6601 | return false; |
6602 | } |
6603 | |
6604 | return HasNonDeletedCopyOrMove; |
6605 | } |
6606 | |
6607 | /// Report an error regarding overriding, along with any relevant |
6608 | /// overridden methods. |
6609 | /// |
6610 | /// \param DiagID the primary error to report. |
6611 | /// \param MD the overriding method. |
6612 | static bool |
6613 | ReportOverrides(Sema &S, unsigned DiagID, const CXXMethodDecl *MD, |
6614 | llvm::function_ref<bool(const CXXMethodDecl *)> Report) { |
6615 | bool IssuedDiagnostic = false; |
6616 | for (const CXXMethodDecl *O : MD->overridden_methods()) { |
6617 | if (Report(O)) { |
6618 | if (!IssuedDiagnostic) { |
6619 | S.Diag(MD->getLocation(), DiagID) << MD->getDeclName(); |
6620 | IssuedDiagnostic = true; |
6621 | } |
6622 | S.Diag(O->getLocation(), diag::note_overridden_virtual_function); |
6623 | } |
6624 | } |
6625 | return IssuedDiagnostic; |
6626 | } |
6627 | |
6628 | /// Perform semantic checks on a class definition that has been |
6629 | /// completing, introducing implicitly-declared members, checking for |
6630 | /// abstract types, etc. |
6631 | /// |
6632 | /// \param S The scope in which the class was parsed. Null if we didn't just |
6633 | /// parse a class definition. |
6634 | /// \param Record The completed class. |
6635 | void Sema::CheckCompletedCXXClass(Scope *S, CXXRecordDecl *Record) { |
6636 | if (!Record) |
6637 | return; |
6638 | |
6639 | if (Record->isAbstract() && !Record->isInvalidDecl()) { |
6640 | AbstractUsageInfo Info(*this, Record); |
6641 | CheckAbstractClassUsage(Info, Record); |
6642 | } |
6643 | |
6644 | // If this is not an aggregate type and has no user-declared constructor, |
6645 | // complain about any non-static data members of reference or const scalar |
6646 | // type, since they will never get initializers. |
6647 | if (!Record->isInvalidDecl() && !Record->isDependentType() && |
6648 | !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && |
6649 | !Record->isLambda()) { |
6650 | bool Complained = false; |
6651 | for (const auto *F : Record->fields()) { |
6652 | if (F->hasInClassInitializer() || F->isUnnamedBitfield()) |
6653 | continue; |
6654 | |
6655 | if (F->getType()->isReferenceType() || |
6656 | (F->getType().isConstQualified() && F->getType()->isScalarType())) { |
6657 | if (!Complained) { |
6658 | Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) |
6659 | << Record->getTagKind() << Record; |
6660 | Complained = true; |
6661 | } |
6662 | |
6663 | Diag(F->getLocation(), diag::note_refconst_member_not_initialized) |
6664 | << F->getType()->isReferenceType() |
6665 | << F->getDeclName(); |
6666 | } |
6667 | } |
6668 | } |
6669 | |
6670 | if (Record->getIdentifier()) { |
6671 | // C++ [class.mem]p13: |
6672 | // If T is the name of a class, then each of the following shall have a |
6673 | // name different from T: |
6674 | // - every member of every anonymous union that is a member of class T. |
6675 | // |
6676 | // C++ [class.mem]p14: |
6677 | // In addition, if class T has a user-declared constructor (12.1), every |
6678 | // non-static data member of class T shall have a name different from T. |
6679 | DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); |
6680 | for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; |
6681 | ++I) { |
6682 | NamedDecl *D = (*I)->getUnderlyingDecl(); |
6683 | if (((isa<FieldDecl>(D) || isa<UnresolvedUsingValueDecl>(D)) && |
6684 | Record->hasUserDeclaredConstructor()) || |
6685 | isa<IndirectFieldDecl>(D)) { |
6686 | Diag((*I)->getLocation(), diag::err_member_name_of_class) |
6687 | << D->getDeclName(); |
6688 | break; |
6689 | } |
6690 | } |
6691 | } |
6692 | |
6693 | // Warn if the class has virtual methods but non-virtual public destructor. |
6694 | if (Record->isPolymorphic() && !Record->isDependentType()) { |
6695 | CXXDestructorDecl *dtor = Record->getDestructor(); |
6696 | if ((!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) && |
6697 | !Record->hasAttr<FinalAttr>()) |
6698 | Diag(dtor ? dtor->getLocation() : Record->getLocation(), |
6699 | diag::warn_non_virtual_dtor) << Context.getRecordType(Record); |
6700 | } |
6701 | |
6702 | if (Record->isAbstract()) { |
6703 | if (FinalAttr *FA = Record->getAttr<FinalAttr>()) { |
6704 | Diag(Record->getLocation(), diag::warn_abstract_final_class) |
6705 | << FA->isSpelledAsSealed(); |
6706 | DiagnoseAbstractType(Record); |
6707 | } |
6708 | } |
6709 | |
6710 | // Warn if the class has a final destructor but is not itself marked final. |
6711 | if (!Record->hasAttr<FinalAttr>()) { |
6712 | if (const CXXDestructorDecl *dtor = Record->getDestructor()) { |
6713 | if (const FinalAttr *FA = dtor->getAttr<FinalAttr>()) { |
6714 | Diag(FA->getLocation(), diag::warn_final_dtor_non_final_class) |
6715 | << FA->isSpelledAsSealed() |
6716 | << FixItHint::CreateInsertion( |
6717 | getLocForEndOfToken(Record->getLocation()), |
6718 | (FA->isSpelledAsSealed() ? " sealed" : " final")); |
6719 | Diag(Record->getLocation(), |
6720 | diag::note_final_dtor_non_final_class_silence) |
6721 | << Context.getRecordType(Record) << FA->isSpelledAsSealed(); |
6722 | } |
6723 | } |
6724 | } |
6725 | |
6726 | // See if trivial_abi has to be dropped. |
6727 | if (Record->hasAttr<TrivialABIAttr>()) |
6728 | checkIllFormedTrivialABIStruct(*Record); |
6729 | |
6730 | // Set HasTrivialSpecialMemberForCall if the record has attribute |
6731 | // "trivial_abi". |
6732 | bool HasTrivialABI = Record->hasAttr<TrivialABIAttr>(); |
6733 | |
6734 | if (HasTrivialABI) |
6735 | Record->setHasTrivialSpecialMemberForCall(); |
6736 | |
6737 | // Explicitly-defaulted secondary comparison functions (!=, <, <=, >, >=). |
6738 | // We check these last because they can depend on the properties of the |
6739 | // primary comparison functions (==, <=>). |
6740 | llvm::SmallVector<FunctionDecl*, 5> DefaultedSecondaryComparisons; |
6741 | |
6742 | // Perform checks that can't be done until we know all the properties of a |
6743 | // member function (whether it's defaulted, deleted, virtual, overriding, |
6744 | // ...). |
6745 | auto CheckCompletedMemberFunction = [&](CXXMethodDecl *MD) { |
6746 | // A static function cannot override anything. |
6747 | if (MD->getStorageClass() == SC_Static) { |
6748 | if (ReportOverrides(*this, diag::err_static_overrides_virtual, MD, |
6749 | [](const CXXMethodDecl *) { return true; })) |
6750 | return; |
6751 | } |
6752 | |
6753 | // A deleted function cannot override a non-deleted function and vice |
6754 | // versa. |
6755 | if (ReportOverrides(*this, |
6756 | MD->isDeleted() ? diag::err_deleted_override |
6757 | : diag::err_non_deleted_override, |
6758 | MD, [&](const CXXMethodDecl *V) { |
6759 | return MD->isDeleted() != V->isDeleted(); |
6760 | })) { |
6761 | if (MD->isDefaulted() && MD->isDeleted()) |
6762 | // Explain why this defaulted function was deleted. |
6763 | DiagnoseDeletedDefaultedFunction(MD); |
6764 | return; |
6765 | } |
6766 | |
6767 | // A consteval function cannot override a non-consteval function and vice |
6768 | // versa. |
6769 | if (ReportOverrides(*this, |
6770 | MD->isConsteval() ? diag::err_consteval_override |
6771 | : diag::err_non_consteval_override, |
6772 | MD, [&](const CXXMethodDecl *V) { |
6773 | return MD->isConsteval() != V->isConsteval(); |
6774 | })) { |
6775 | if (MD->isDefaulted() && MD->isDeleted()) |
6776 | // Explain why this defaulted function was deleted. |
6777 | DiagnoseDeletedDefaultedFunction(MD); |
6778 | return; |
6779 | } |
6780 | }; |
6781 | |
6782 | auto CheckForDefaultedFunction = [&](FunctionDecl *FD) -> bool { |
6783 | if (!FD || FD->isInvalidDecl() || !FD->isExplicitlyDefaulted()) |
6784 | return false; |
6785 | |
6786 | DefaultedFunctionKind DFK = getDefaultedFunctionKind(FD); |
6787 | if (DFK.asComparison() == DefaultedComparisonKind::NotEqual || |
6788 | DFK.asComparison() == DefaultedComparisonKind::Relational) { |
6789 | DefaultedSecondaryComparisons.push_back(FD); |
6790 | return true; |
6791 | } |
6792 | |
6793 | CheckExplicitlyDefaultedFunction(S, FD); |
6794 | return false; |
6795 | }; |
6796 | |
6797 | auto CompleteMemberFunction = [&](CXXMethodDecl *M) { |
6798 | // Check whether the explicitly-defaulted members are valid. |
6799 | bool Incomplete = CheckForDefaultedFunction(M); |
6800 | |
6801 | // Skip the rest of the checks for a member of a dependent class. |
6802 | if (Record->isDependentType()) |
6803 | return; |
6804 | |
6805 | // For an explicitly defaulted or deleted special member, we defer |
6806 | // determining triviality until the class is complete. That time is now! |
6807 | CXXSpecialMember CSM = getSpecialMember(M); |
6808 | if (!M->isImplicit() && !M->isUserProvided()) { |
6809 | if (CSM != CXXInvalid) { |
6810 | M->setTrivial(SpecialMemberIsTrivial(M, CSM)); |
6811 | // Inform the class that we've finished declaring this member. |
6812 | Record->finishedDefaultedOrDeletedMember(M); |
6813 | M->setTrivialForCall( |
6814 | HasTrivialABI || |
6815 | SpecialMemberIsTrivial(M, CSM, TAH_ConsiderTrivialABI)); |
6816 | Record->setTrivialForCallFlags(M); |
6817 | } |
6818 | } |
6819 | |
6820 | // Set triviality for the purpose of calls if this is a user-provided |
6821 | // copy/move constructor or destructor. |
6822 | if ((CSM == CXXCopyConstructor || CSM == CXXMoveConstructor || |
6823 | CSM == CXXDestructor) && M->isUserProvided()) { |
6824 | M->setTrivialForCall(HasTrivialABI); |
6825 | Record->setTrivialForCallFlags(M); |
6826 | } |
6827 | |
6828 | if (!M->isInvalidDecl() && M->isExplicitlyDefaulted() && |
6829 | M->hasAttr<DLLExportAttr>()) { |
6830 | if (getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015) && |
6831 | M->isTrivial() && |
6832 | (CSM == CXXDefaultConstructor || CSM == CXXCopyConstructor || |
6833 | CSM == CXXDestructor)) |
6834 | M->dropAttr<DLLExportAttr>(); |
6835 | |
6836 | if (M->hasAttr<DLLExportAttr>()) { |
6837 | // Define after any fields with in-class initializers have been parsed. |
6838 | DelayedDllExportMemberFunctions.push_back(M); |
6839 | } |
6840 | } |
6841 | |
6842 | // Define defaulted constexpr virtual functions that override a base class |
6843 | // function right away. |
6844 | // FIXME: We can defer doing this until the vtable is marked as used. |
6845 | if (M->isDefaulted() && M->isConstexpr() && M->size_overridden_methods()) |
6846 | DefineDefaultedFunction(*this, M, M->getLocation()); |
6847 | |
6848 | if (!Incomplete) |
6849 | CheckCompletedMemberFunction(M); |
6850 | }; |
6851 | |
6852 | // Check the destructor before any other member function. We need to |
6853 | // determine whether it's trivial in order to determine whether the claas |
6854 | // type is a literal type, which is a prerequisite for determining whether |
6855 | // other special member functions are valid and whether they're implicitly |
6856 | // 'constexpr'. |
6857 | if (CXXDestructorDecl *Dtor = Record->getDestructor()) |
6858 | CompleteMemberFunction(Dtor); |
6859 | |
6860 | bool HasMethodWithOverrideControl = false, |
6861 | HasOverridingMethodWithoutOverrideControl = false; |
6862 | for (auto *D : Record->decls()) { |
6863 | if (auto *M = dyn_cast<CXXMethodDecl>(D)) { |
6864 | // FIXME: We could do this check for dependent types with non-dependent |
6865 | // bases. |
6866 | if (!Record->isDependentType()) { |
6867 | // See if a method overloads virtual methods in a base |
6868 | // class without overriding any. |
6869 | if (!M->isStatic()) |
6870 | DiagnoseHiddenVirtualMethods(M); |
6871 | if (M->hasAttr<OverrideAttr>()) |
6872 | HasMethodWithOverrideControl = true; |
6873 | else if (M->size_overridden_methods() > 0) |
6874 | HasOverridingMethodWithoutOverrideControl = true; |
6875 | } |
6876 | |
6877 | if (!isa<CXXDestructorDecl>(M)) |
6878 | CompleteMemberFunction(M); |
6879 | } else if (auto *F = dyn_cast<FriendDecl>(D)) { |
6880 | CheckForDefaultedFunction( |
6881 | dyn_cast_or_null<FunctionDecl>(F->getFriendDecl())); |
6882 | } |
6883 | } |
6884 | |
6885 | if (HasOverridingMethodWithoutOverrideControl) { |
6886 | bool HasInconsistentOverrideControl = HasMethodWithOverrideControl; |
6887 | for (auto *M : Record->methods()) |
6888 | DiagnoseAbsenceOfOverrideControl(M, HasInconsistentOverrideControl); |
6889 | } |
6890 | |
6891 | // Check the defaulted secondary comparisons after any other member functions. |
6892 | for (FunctionDecl *FD : DefaultedSecondaryComparisons) { |
6893 | CheckExplicitlyDefaultedFunction(S, FD); |
6894 | |
6895 | // If this is a member function, we deferred checking it until now. |
6896 | if (auto *MD = dyn_cast<CXXMethodDecl>(FD)) |
6897 | CheckCompletedMemberFunction(MD); |
6898 | } |
6899 | |
6900 | // ms_struct is a request to use the same ABI rules as MSVC. Check |
6901 | // whether this class uses any C++ features that are implemented |
6902 | // completely differently in MSVC, and if so, emit a diagnostic. |
6903 | // That diagnostic defaults to an error, but we allow projects to |
6904 | // map it down to a warning (or ignore it). It's a fairly common |
6905 | // practice among users of the ms_struct pragma to mass-annotate |
6906 | // headers, sweeping up a bunch of types that the project doesn't |
6907 | // really rely on MSVC-compatible layout for. We must therefore |
6908 | // support "ms_struct except for C++ stuff" as a secondary ABI. |
6909 | // Don't emit this diagnostic if the feature was enabled as a |
6910 | // language option (as opposed to via a pragma or attribute), as |
6911 | // the option -mms-bitfields otherwise essentially makes it impossible |
6912 | // to build C++ code, unless this diagnostic is turned off. |
6913 | if (Record->isMsStruct(Context) && !Context.getLangOpts().MSBitfields && |
6914 | (Record->isPolymorphic() || Record->getNumBases())) { |
6915 | Diag(Record->getLocation(), diag::warn_cxx_ms_struct); |
6916 | } |
6917 | |
6918 | checkClassLevelDLLAttribute(Record); |
6919 | checkClassLevelCodeSegAttribute(Record); |
6920 | |
6921 | bool ClangABICompat4 = |
6922 | Context.getLangOpts().getClangABICompat() <= LangOptions::ClangABI::Ver4; |
6923 | TargetInfo::CallingConvKind CCK = |
6924 | Context.getTargetInfo().getCallingConvKind(ClangABICompat4); |
6925 | bool CanPass = canPassInRegisters(*this, Record, CCK); |
6926 | |
6927 | // Do not change ArgPassingRestrictions if it has already been set to |
6928 | // APK_CanNeverPassInRegs. |
6929 | if (Record->getArgPassingRestrictions() != RecordDecl::APK_CanNeverPassInRegs) |
6930 | Record->setArgPassingRestrictions(CanPass |
6931 | ? RecordDecl::APK_CanPassInRegs |
6932 | : RecordDecl::APK_CannotPassInRegs); |
6933 | |
6934 | // If canPassInRegisters returns true despite the record having a non-trivial |
6935 | // destructor, the record is destructed in the callee. This happens only when |
6936 | // the record or one of its subobjects has a field annotated with trivial_abi |
6937 | // or a field qualified with ObjC __strong/__weak. |
6938 | if (Context.getTargetInfo().getCXXABI().areArgsDestroyedLeftToRightInCallee()) |
6939 | Record->setParamDestroyedInCallee(true); |
6940 | else if (Record->hasNonTrivialDestructor()) |
6941 | Record->setParamDestroyedInCallee(CanPass); |
6942 | |
6943 | if (getLangOpts().ForceEmitVTables) { |
6944 | // If we want to emit all the vtables, we need to mark it as used. This |
6945 | // is especially required for cases like vtable assumption loads. |
6946 | MarkVTableUsed(Record->getInnerLocStart(), Record); |
6947 | } |
6948 | |
6949 | if (getLangOpts().CUDA) { |
6950 | if (Record->hasAttr<CUDADeviceBuiltinSurfaceTypeAttr>()) |
6951 | checkCUDADeviceBuiltinSurfaceClassTemplate(*this, Record); |
6952 | else if (Record->hasAttr<CUDADeviceBuiltinTextureTypeAttr>()) |
6953 | checkCUDADeviceBuiltinTextureClassTemplate(*this, Record); |
6954 | } |
6955 | } |
6956 | |
6957 | /// Look up the special member function that would be called by a special |
6958 | /// member function for a subobject of class type. |
6959 | /// |
6960 | /// \param Class The class type of the subobject. |
6961 | /// \param CSM The kind of special member function. |
6962 | /// \param FieldQuals If the subobject is a field, its cv-qualifiers. |
6963 | /// \param ConstRHS True if this is a copy operation with a const object |
6964 | /// on its RHS, that is, if the argument to the outer special member |
6965 | /// function is 'const' and this is not a field marked 'mutable'. |
6966 | static Sema::SpecialMemberOverloadResult lookupCallFromSpecialMember( |
6967 | Sema &S, CXXRecordDecl *Class, Sema::CXXSpecialMember CSM, |
6968 | unsigned FieldQuals, bool ConstRHS) { |
6969 | unsigned LHSQuals = 0; |
6970 | if (CSM == Sema::CXXCopyAssignment || CSM == Sema::CXXMoveAssignment) |
6971 | LHSQuals = FieldQuals; |
6972 | |
6973 | unsigned RHSQuals = FieldQuals; |
6974 | if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) |
6975 | RHSQuals = 0; |
6976 | else if (ConstRHS) |
6977 | RHSQuals |= Qualifiers::Const; |
6978 | |
6979 | return S.LookupSpecialMember(Class, CSM, |
6980 | RHSQuals & Qualifiers::Const, |
6981 | RHSQuals & Qualifiers::Volatile, |
6982 | false, |
6983 | LHSQuals & Qualifiers::Const, |
6984 | LHSQuals & Qualifiers::Volatile); |
6985 | } |
6986 | |
6987 | class Sema::InheritedConstructorInfo { |
6988 | Sema &S; |
6989 | SourceLocation UseLoc; |
6990 | |
6991 | /// A mapping from the base classes through which the constructor was |
6992 | /// inherited to the using shadow declaration in that base class (or a null |
6993 | /// pointer if the constructor was declared in that base class). |
6994 | llvm::DenseMap<CXXRecordDecl *, ConstructorUsingShadowDecl *> |
6995 | InheritedFromBases; |
6996 | |
6997 | public: |
6998 | InheritedConstructorInfo(Sema &S, SourceLocation UseLoc, |
6999 | ConstructorUsingShadowDecl *Shadow) |
7000 | : S(S), UseLoc(UseLoc) { |
7001 | bool DiagnosedMultipleConstructedBases = false; |
7002 | CXXRecordDecl *ConstructedBase = nullptr; |
7003 | BaseUsingDecl *ConstructedBaseIntroducer = nullptr; |
7004 | |
7005 | // Find the set of such base class subobjects and check that there's a |
7006 | // unique constructed subobject. |
7007 | for (auto *D : Shadow->redecls()) { |
7008 | auto *DShadow = cast<ConstructorUsingShadowDecl>(D); |
7009 | auto *DNominatedBase = DShadow->getNominatedBaseClass(); |
7010 | auto *DConstructedBase = DShadow->getConstructedBaseClass(); |
7011 | |
7012 | InheritedFromBases.insert( |
7013 | std::make_pair(DNominatedBase->getCanonicalDecl(), |
7014 | DShadow->getNominatedBaseClassShadowDecl())); |
7015 | if (DShadow->constructsVirtualBase()) |
7016 | InheritedFromBases.insert( |
7017 | std::make_pair(DConstructedBase->getCanonicalDecl(), |
7018 | DShadow->getConstructedBaseClassShadowDecl())); |
7019 | else |
7020 | assert(DNominatedBase == DConstructedBase)((void)0); |
7021 | |
7022 | // [class.inhctor.init]p2: |
7023 | // If the constructor was inherited from multiple base class subobjects |
7024 | // of type B, the program is ill-formed. |
7025 | if (!ConstructedBase) { |
7026 | ConstructedBase = DConstructedBase; |
7027 | ConstructedBaseIntroducer = D->getIntroducer(); |
7028 | } else if (ConstructedBase != DConstructedBase && |
7029 | !Shadow->isInvalidDecl()) { |
7030 | if (!DiagnosedMultipleConstructedBases) { |
7031 | S.Diag(UseLoc, diag::err_ambiguous_inherited_constructor) |
7032 | << Shadow->getTargetDecl(); |
7033 | S.Diag(ConstructedBaseIntroducer->getLocation(), |
7034 | diag::note_ambiguous_inherited_constructor_using) |
7035 | << ConstructedBase; |
7036 | DiagnosedMultipleConstructedBases = true; |
7037 | } |
7038 | S.Diag(D->getIntroducer()->getLocation(), |
7039 | diag::note_ambiguous_inherited_constructor_using) |
7040 | << DConstructedBase; |
7041 | } |
7042 | } |
7043 | |
7044 | if (DiagnosedMultipleConstructedBases) |
7045 | Shadow->setInvalidDecl(); |
7046 | } |
7047 | |
7048 | /// Find the constructor to use for inherited construction of a base class, |
7049 | /// and whether that base class constructor inherits the constructor from a |
7050 | /// virtual base class (in which case it won't actually invoke it). |
7051 | std::pair<CXXConstructorDecl *, bool> |
7052 | findConstructorForBase(CXXRecordDecl *Base, CXXConstructorDecl *Ctor) const { |
7053 | auto It = InheritedFromBases.find(Base->getCanonicalDecl()); |
7054 | if (It == InheritedFromBases.end()) |
7055 | return std::make_pair(nullptr, false); |
7056 | |
7057 | // This is an intermediary class. |
7058 | if (It->second) |
7059 | return std::make_pair( |
7060 | S.findInheritingConstructor(UseLoc, Ctor, It->second), |
7061 | It->second->constructsVirtualBase()); |
7062 | |
7063 | // This is the base class from which the constructor was inherited. |
7064 | return std::make_pair(Ctor, false); |
7065 | } |
7066 | }; |
7067 | |
7068 | /// Is the special member function which would be selected to perform the |
7069 | /// specified operation on the specified class type a constexpr constructor? |
7070 | static bool |
7071 | specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, |
7072 | Sema::CXXSpecialMember CSM, unsigned Quals, |
7073 | bool ConstRHS, |
7074 | CXXConstructorDecl *InheritedCtor = nullptr, |
7075 | Sema::InheritedConstructorInfo *Inherited = nullptr) { |
7076 | // If we're inheriting a constructor, see if we need to call it for this base |
7077 | // class. |
7078 | if (InheritedCtor) { |
7079 | assert(CSM == Sema::CXXDefaultConstructor)((void)0); |
7080 | auto BaseCtor = |
7081 | Inherited->findConstructorForBase(ClassDecl, InheritedCtor).first; |
7082 | if (BaseCtor) |
7083 | return BaseCtor->isConstexpr(); |
7084 | } |
7085 | |
7086 | if (CSM == Sema::CXXDefaultConstructor) |
7087 | return ClassDecl->hasConstexprDefaultConstructor(); |
7088 | if (CSM == Sema::CXXDestructor) |
7089 | return ClassDecl->hasConstexprDestructor(); |
7090 | |
7091 | Sema::SpecialMemberOverloadResult SMOR = |
7092 | lookupCallFromSpecialMember(S, ClassDecl, CSM, Quals, ConstRHS); |
7093 | if (!SMOR.getMethod()) |
7094 | // A constructor we wouldn't select can't be "involved in initializing" |
7095 | // anything. |
7096 | return true; |
7097 | return SMOR.getMethod()->isConstexpr(); |
7098 | } |
7099 | |
7100 | /// Determine whether the specified special member function would be constexpr |
7101 | /// if it were implicitly defined. |
7102 | static bool defaultedSpecialMemberIsConstexpr( |
7103 | Sema &S, CXXRecordDecl *ClassDecl, Sema::CXXSpecialMember CSM, |
7104 | bool ConstArg, CXXConstructorDecl *InheritedCtor = nullptr, |
7105 | Sema::InheritedConstructorInfo *Inherited = nullptr) { |
7106 | if (!S.getLangOpts().CPlusPlus11) |
7107 | return false; |
7108 | |
7109 | // C++11 [dcl.constexpr]p4: |
7110 | // In the definition of a constexpr constructor [...] |
7111 | bool Ctor = true; |
7112 | switch (CSM) { |
7113 | case Sema::CXXDefaultConstructor: |
7114 | if (Inherited) |
7115 | break; |
7116 | // Since default constructor lookup is essentially trivial (and cannot |
7117 | // involve, for instance, template instantiation), we compute whether a |
7118 | // defaulted default constructor is constexpr directly within CXXRecordDecl. |
7119 | // |
7120 | // This is important for performance; we need to know whether the default |
7121 | // constructor is constexpr to determine whether the type is a literal type. |
7122 | return ClassDecl->defaultedDefaultConstructorIsConstexpr(); |
7123 | |
7124 | case Sema::CXXCopyConstructor: |
7125 | case Sema::CXXMoveConstructor: |
7126 | // For copy or move constructors, we need to perform overload resolution. |
7127 | break; |
7128 | |
7129 | case Sema::CXXCopyAssignment: |
7130 | case Sema::CXXMoveAssignment: |
7131 | if (!S.getLangOpts().CPlusPlus14) |
7132 | return false; |
7133 | // In C++1y, we need to perform overload resolution. |
7134 | Ctor = false; |
7135 | break; |
7136 | |
7137 | case Sema::CXXDestructor: |
7138 | return ClassDecl->defaultedDestructorIsConstexpr(); |
7139 | |
7140 | case Sema::CXXInvalid: |
7141 | return false; |
7142 | } |
7143 | |
7144 | // -- if the class is a non-empty union, or for each non-empty anonymous |
7145 | // union member of a non-union class, exactly one non-static data member |
7146 | // shall be initialized; [DR1359] |
7147 | // |
7148 | // If we squint, this is guaranteed, since exactly one non-static data member |
7149 | // will be initialized (if the constructor isn't deleted), we just don't know |
7150 | // which one. |
7151 | if (Ctor && ClassDecl->isUnion()) |
7152 | return CSM == Sema::CXXDefaultConstructor |
7153 | ? ClassDecl->hasInClassInitializer() || |
7154 | !ClassDecl->hasVariantMembers() |
7155 | : true; |
7156 | |
7157 | // -- the class shall not have any virtual base classes; |
7158 | if (Ctor && ClassDecl->getNumVBases()) |
7159 | return false; |
7160 | |
7161 | // C++1y [class.copy]p26: |
7162 | // -- [the class] is a literal type, and |
7163 | if (!Ctor && !ClassDecl->isLiteral()) |
7164 | return false; |
7165 | |
7166 | // -- every constructor involved in initializing [...] base class |
7167 | // sub-objects shall be a constexpr constructor; |
7168 | // -- the assignment operator selected to copy/move each direct base |
7169 | // class is a constexpr function, and |
7170 | for (const auto &B : ClassDecl->bases()) { |
7171 | const RecordType *BaseType = B.getType()->getAs<RecordType>(); |
7172 | if (!BaseType) continue; |
7173 | |
7174 | CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); |
7175 | if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, 0, ConstArg, |
7176 | InheritedCtor, Inherited)) |
7177 | return false; |
7178 | } |
7179 | |
7180 | // -- every constructor involved in initializing non-static data members |
7181 | // [...] shall be a constexpr constructor; |
7182 | // -- every non-static data member and base class sub-object shall be |
7183 | // initialized |
7184 | // -- for each non-static data member of X that is of class type (or array |
7185 | // thereof), the assignment operator selected to copy/move that member is |
7186 | // a constexpr function |
7187 | for (const auto *F : ClassDecl->fields()) { |
7188 | if (F->isInvalidDecl()) |
7189 | continue; |
7190 | if (CSM == Sema::CXXDefaultConstructor && F->hasInClassInitializer()) |
7191 | continue; |
7192 | QualType BaseType = S.Context.getBaseElementType(F->getType()); |
7193 | if (const RecordType *RecordTy = BaseType->getAs<RecordType>()) { |
7194 | CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); |
7195 | if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, |
7196 | BaseType.getCVRQualifiers(), |
7197 | ConstArg && !F->isMutable())) |
7198 | return false; |
7199 | } else if (CSM == Sema::CXXDefaultConstructor) { |
7200 | return false; |
7201 | } |
7202 | } |
7203 | |
7204 | // All OK, it's constexpr! |
7205 | return true; |
7206 | } |
7207 | |
7208 | namespace { |
7209 | /// RAII object to register a defaulted function as having its exception |
7210 | /// specification computed. |
7211 | struct ComputingExceptionSpec { |
7212 | Sema &S; |
7213 | |
7214 | ComputingExceptionSpec(Sema &S, FunctionDecl *FD, SourceLocation Loc) |
7215 | : S(S) { |
7216 | Sema::CodeSynthesisContext Ctx; |
7217 | Ctx.Kind = Sema::CodeSynthesisContext::ExceptionSpecEvaluation; |
7218 | Ctx.PointOfInstantiation = Loc; |
7219 | Ctx.Entity = FD; |
7220 | S.pushCodeSynthesisContext(Ctx); |
7221 | } |
7222 | ~ComputingExceptionSpec() { |
7223 | S.popCodeSynthesisContext(); |
7224 | } |
7225 | }; |
7226 | } |
7227 | |
7228 | static Sema::ImplicitExceptionSpecification |
7229 | ComputeDefaultedSpecialMemberExceptionSpec( |
7230 | Sema &S, SourceLocation Loc, CXXMethodDecl *MD, Sema::CXXSpecialMember CSM, |
7231 | Sema::InheritedConstructorInfo *ICI); |
7232 | |
7233 | static Sema::ImplicitExceptionSpecification |
7234 | ComputeDefaultedComparisonExceptionSpec(Sema &S, SourceLocation Loc, |
7235 | FunctionDecl *FD, |
7236 | Sema::DefaultedComparisonKind DCK); |
7237 | |
7238 | static Sema::ImplicitExceptionSpecification |
7239 | computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, FunctionDecl *FD) { |
7240 | auto DFK = S.getDefaultedFunctionKind(FD); |
7241 | if (DFK.isSpecialMember()) |
7242 | return ComputeDefaultedSpecialMemberExceptionSpec( |
7243 | S, Loc, cast<CXXMethodDecl>(FD), DFK.asSpecialMember(), nullptr); |
7244 | if (DFK.isComparison()) |
7245 | return ComputeDefaultedComparisonExceptionSpec(S, Loc, FD, |
7246 | DFK.asComparison()); |
7247 | |
7248 | auto *CD = cast<CXXConstructorDecl>(FD); |
7249 | assert(CD->getInheritedConstructor() &&((void)0) |
7250 | "only defaulted functions and inherited constructors have implicit "((void)0) |
7251 | "exception specs")((void)0); |
7252 | Sema::InheritedConstructorInfo ICI( |
7253 | S, Loc, CD->getInheritedConstructor().getShadowDecl()); |
7254 | return ComputeDefaultedSpecialMemberExceptionSpec( |
7255 | S, Loc, CD, Sema::CXXDefaultConstructor, &ICI); |
7256 | } |
7257 | |
7258 | static FunctionProtoType::ExtProtoInfo getImplicitMethodEPI(Sema &S, |
7259 | CXXMethodDecl *MD) { |
7260 | FunctionProtoType::ExtProtoInfo EPI; |
7261 | |
7262 | // Build an exception specification pointing back at this member. |
7263 | EPI.ExceptionSpec.Type = EST_Unevaluated; |
7264 | EPI.ExceptionSpec.SourceDecl = MD; |
7265 | |
7266 | // Set the calling convention to the default for C++ instance methods. |
7267 | EPI.ExtInfo = EPI.ExtInfo.withCallingConv( |
7268 | S.Context.getDefaultCallingConvention(/*IsVariadic=*/false, |
7269 | /*IsCXXMethod=*/true)); |
7270 | return EPI; |
7271 | } |
7272 | |
7273 | void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, FunctionDecl *FD) { |
7274 | const FunctionProtoType *FPT = FD->getType()->castAs<FunctionProtoType>(); |
7275 | if (FPT->getExceptionSpecType() != EST_Unevaluated) |
7276 | return; |
7277 | |
7278 | // Evaluate the exception specification. |
7279 | auto IES = computeImplicitExceptionSpec(*this, Loc, FD); |
7280 | auto ESI = IES.getExceptionSpec(); |
7281 | |
7282 | // Update the type of the special member to use it. |
7283 | UpdateExceptionSpec(FD, ESI); |
7284 | } |
7285 | |
7286 | void Sema::CheckExplicitlyDefaultedFunction(Scope *S, FunctionDecl *FD) { |
7287 | assert(FD->isExplicitlyDefaulted() && "not explicitly-defaulted")((void)0); |
7288 | |
7289 | DefaultedFunctionKind DefKind = getDefaultedFunctionKind(FD); |
7290 | if (!DefKind) { |
7291 | assert(FD->getDeclContext()->isDependentContext())((void)0); |
7292 | return; |
7293 | } |
7294 | |
7295 | if (DefKind.isComparison()) |
7296 | UnusedPrivateFields.clear(); |
7297 | |
7298 | if (DefKind.isSpecialMember() |
7299 | ? CheckExplicitlyDefaultedSpecialMember(cast<CXXMethodDecl>(FD), |
7300 | DefKind.asSpecialMember()) |
7301 | : CheckExplicitlyDefaultedComparison(S, FD, DefKind.asComparison())) |
7302 | FD->setInvalidDecl(); |
7303 | } |
7304 | |
7305 | bool Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD, |
7306 | CXXSpecialMember CSM) { |
7307 | CXXRecordDecl *RD = MD->getParent(); |
7308 | |
7309 | assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid &&((void)0) |
7310 | "not an explicitly-defaulted special member")((void)0); |
7311 | |
7312 | // Defer all checking for special members of a dependent type. |
7313 | if (RD->isDependentType()) |
7314 | return false; |
7315 | |
7316 | // Whether this was the first-declared instance of the constructor. |
7317 | // This affects whether we implicitly add an exception spec and constexpr. |
7318 | bool First = MD == MD->getCanonicalDecl(); |
7319 | |
7320 | bool HadError = false; |
7321 | |
7322 | // C++11 [dcl.fct.def.default]p1: |
7323 | // A function that is explicitly defaulted shall |
7324 | // -- be a special member function [...] (checked elsewhere), |
7325 | // -- have the same type (except for ref-qualifiers, and except that a |
7326 | // copy operation can take a non-const reference) as an implicit |
7327 | // declaration, and |
7328 | // -- not have default arguments. |
7329 | // C++2a changes the second bullet to instead delete the function if it's |
7330 | // defaulted on its first declaration, unless it's "an assignment operator, |
7331 | // and its return type differs or its parameter type is not a reference". |
7332 | bool DeleteOnTypeMismatch = getLangOpts().CPlusPlus20 && First; |
7333 | bool ShouldDeleteForTypeMismatch = false; |
7334 | unsigned ExpectedParams = 1; |
7335 | if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) |
7336 | ExpectedParams = 0; |
7337 | if (MD->getNumParams() != ExpectedParams) { |
7338 | // This checks for default arguments: a copy or move constructor with a |
7339 | // default argument is classified as a default constructor, and assignment |
7340 | // operations and destructors can't have default arguments. |
7341 | Diag(MD->getLocation(), diag::err_defaulted_special_member_params) |
7342 | << CSM << MD->getSourceRange(); |
7343 | HadError = true; |
7344 | } else if (MD->isVariadic()) { |
7345 | if (DeleteOnTypeMismatch) |
7346 | ShouldDeleteForTypeMismatch = true; |
7347 | else { |
7348 | Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic) |
7349 | << CSM << MD->getSourceRange(); |
7350 | HadError = true; |
7351 | } |
7352 | } |
7353 | |
7354 | const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); |
7355 | |
7356 | bool CanHaveConstParam = false; |
7357 | if (CSM == CXXCopyConstructor) |
7358 | CanHaveConstParam = RD->implicitCopyConstructorHasConstParam(); |
7359 | else if (CSM == CXXCopyAssignment) |
7360 | CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam(); |
7361 | |
7362 | QualType ReturnType = Context.VoidTy; |
7363 | if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { |
7364 | // Check for return type matching. |
7365 | ReturnType = Type->getReturnType(); |
7366 | |
7367 | QualType DeclType = Context.getTypeDeclType(RD); |
7368 | DeclType = Context.getAddrSpaceQualType(DeclType, MD->getMethodQualifiers().getAddressSpace()); |
7369 | QualType ExpectedReturnType = Context.getLValueReferenceType(DeclType); |
7370 | |
7371 | if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { |
7372 | Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) |
7373 | << (CSM == CXXMoveAssignment) << ExpectedReturnType; |
7374 | HadError = true; |
7375 | } |
7376 | |
7377 | // A defaulted special member cannot have cv-qualifiers. |
7378 | if (Type->getMethodQuals().hasConst() || Type->getMethodQuals().hasVolatile()) { |
7379 | if (DeleteOnTypeMismatch) |
7380 | ShouldDeleteForTypeMismatch = true; |
7381 | else { |
7382 | Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) |
7383 | << (CSM == CXXMoveAssignment) << getLangOpts().CPlusPlus14; |
7384 | HadError = true; |
7385 | } |
7386 | } |
7387 | } |
7388 | |
7389 | // Check for parameter type matching. |
7390 | QualType ArgType = ExpectedParams ? Type->getParamType(0) : QualType(); |
7391 | bool HasConstParam = false; |
7392 | if (ExpectedParams && ArgType->isReferenceType()) { |
7393 | // Argument must be reference to possibly-const T. |
7394 | QualType ReferentType = ArgType->getPointeeType(); |
7395 | HasConstParam = ReferentType.isConstQualified(); |
7396 | |
7397 | if (ReferentType.isVolatileQualified()) { |
7398 | if (DeleteOnTypeMismatch) |
7399 | ShouldDeleteForTypeMismatch = true; |
7400 | else { |
7401 | Diag(MD->getLocation(), |
7402 | diag::err_defaulted_special_member_volatile_param) << CSM; |
7403 | HadError = true; |
7404 | } |
7405 | } |
7406 | |
7407 | if (HasConstParam && !CanHaveConstParam) { |
7408 | if (DeleteOnTypeMismatch) |
7409 | ShouldDeleteForTypeMismatch = true; |
7410 | else if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { |
7411 | Diag(MD->getLocation(), |
7412 | diag::err_defaulted_special_member_copy_const_param) |
7413 | << (CSM == CXXCopyAssignment); |
7414 | // FIXME: Explain why this special member can't be const. |
7415 | HadError = true; |
7416 | } else { |
7417 | Diag(MD->getLocation(), |
7418 | diag::err_defaulted_special_member_move_const_param) |
7419 | << (CSM == CXXMoveAssignment); |
7420 | HadError = true; |
7421 | } |
7422 | } |
7423 | } else if (ExpectedParams) { |
7424 | // A copy assignment operator can take its argument by value, but a |
7425 | // defaulted one cannot. |
7426 | assert(CSM == CXXCopyAssignment && "unexpected non-ref argument")((void)0); |
7427 | Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); |
7428 | HadError = true; |
7429 | } |
7430 | |
7431 | // C++11 [dcl.fct.def.default]p2: |
7432 | // An explicitly-defaulted function may be declared constexpr only if it |
7433 | // would have been implicitly declared as constexpr, |
7434 | // Do not apply this rule to members of class templates, since core issue 1358 |
7435 | // makes such functions always instantiate to constexpr functions. For |
7436 | // functions which cannot be constexpr (for non-constructors in C++11 and for |
7437 | // destructors in C++14 and C++17), this is checked elsewhere. |
7438 | // |
7439 | // FIXME: This should not apply if the member is deleted. |
7440 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, |
7441 | HasConstParam); |
7442 | if ((getLangOpts().CPlusPlus20 || |
7443 | (getLangOpts().CPlusPlus14 ? !isa<CXXDestructorDecl>(MD) |
7444 | : isa<CXXConstructorDecl>(MD))) && |
7445 | MD->isConstexpr() && !Constexpr && |
7446 | MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { |
7447 | Diag(MD->getBeginLoc(), MD->isConsteval() |
7448 | ? diag::err_incorrect_defaulted_consteval |
7449 | : diag::err_incorrect_defaulted_constexpr) |
7450 | << CSM; |
7451 | // FIXME: Explain why the special member can't be constexpr. |
7452 | HadError = true; |
7453 | } |
7454 | |
7455 | if (First) { |
7456 | // C++2a [dcl.fct.def.default]p3: |
7457 | // If a function is explicitly defaulted on its first declaration, it is |
7458 | // implicitly considered to be constexpr if the implicit declaration |
7459 | // would be. |
7460 | MD->setConstexprKind(Constexpr ? (MD->isConsteval() |
7461 | ? ConstexprSpecKind::Consteval |
7462 | : ConstexprSpecKind::Constexpr) |
7463 | : ConstexprSpecKind::Unspecified); |
7464 | |
7465 | if (!Type->hasExceptionSpec()) { |
7466 | // C++2a [except.spec]p3: |
7467 | // If a declaration of a function does not have a noexcept-specifier |
7468 | // [and] is defaulted on its first declaration, [...] the exception |
7469 | // specification is as specified below |
7470 | FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); |
7471 | EPI.ExceptionSpec.Type = EST_Unevaluated; |
7472 | EPI.ExceptionSpec.SourceDecl = MD; |
7473 | MD->setType(Context.getFunctionType(ReturnType, |
7474 | llvm::makeArrayRef(&ArgType, |
7475 | ExpectedParams), |
7476 | EPI)); |
7477 | } |
7478 | } |
7479 | |
7480 | if (ShouldDeleteForTypeMismatch || ShouldDeleteSpecialMember(MD, CSM)) { |
7481 | if (First) { |
7482 | SetDeclDeleted(MD, MD->getLocation()); |
7483 | if (!inTemplateInstantiation() && !HadError) { |
7484 | Diag(MD->getLocation(), diag::warn_defaulted_method_deleted) << CSM; |
7485 | if (ShouldDeleteForTypeMismatch) { |
7486 | Diag(MD->getLocation(), diag::note_deleted_type_mismatch) << CSM; |
7487 | } else { |
7488 | ShouldDeleteSpecialMember(MD, CSM, nullptr, /*Diagnose*/true); |
7489 | } |
7490 | } |
7491 | if (ShouldDeleteForTypeMismatch && !HadError) { |
7492 | Diag(MD->getLocation(), |
7493 | diag::warn_cxx17_compat_defaulted_method_type_mismatch) << CSM; |
7494 | } |
7495 | } else { |
7496 | // C++11 [dcl.fct.def.default]p4: |
7497 | // [For a] user-provided explicitly-defaulted function [...] if such a |
7498 | // function is implicitly defined as deleted, the program is ill-formed. |
7499 | Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; |
7500 | assert(!ShouldDeleteForTypeMismatch && "deleted non-first decl")((void)0); |
7501 | ShouldDeleteSpecialMember(MD, CSM, nullptr, /*Diagnose*/true); |
7502 | HadError = true; |
7503 | } |
7504 | } |
7505 | |
7506 | return HadError; |
7507 | } |
7508 | |
7509 | namespace { |
7510 | /// Helper class for building and checking a defaulted comparison. |
7511 | /// |
7512 | /// Defaulted functions are built in two phases: |
7513 | /// |
7514 | /// * First, the set of operations that the function will perform are |
7515 | /// identified, and some of them are checked. If any of the checked |
7516 | /// operations is invalid in certain ways, the comparison function is |
7517 | /// defined as deleted and no body is built. |
7518 | /// * Then, if the function is not defined as deleted, the body is built. |
7519 | /// |
7520 | /// This is accomplished by performing two visitation steps over the eventual |
7521 | /// body of the function. |
7522 | template<typename Derived, typename ResultList, typename Result, |
7523 | typename Subobject> |
7524 | class DefaultedComparisonVisitor { |
7525 | public: |
7526 | using DefaultedComparisonKind = Sema::DefaultedComparisonKind; |
7527 | |
7528 | DefaultedComparisonVisitor(Sema &S, CXXRecordDecl *RD, FunctionDecl *FD, |
7529 | DefaultedComparisonKind DCK) |
7530 | : S(S), RD(RD), FD(FD), DCK(DCK) { |
7531 | if (auto *Info = FD->getDefaultedFunctionInfo()) { |
7532 | // FIXME: Change CreateOverloadedBinOp to take an ArrayRef instead of an |
7533 | // UnresolvedSet to avoid this copy. |
7534 | Fns.assign(Info->getUnqualifiedLookups().begin(), |
7535 | Info->getUnqualifiedLookups().end()); |
7536 | } |
7537 | } |
7538 | |
7539 | ResultList visit() { |
7540 | // The type of an lvalue naming a parameter of this function. |
7541 | QualType ParamLvalType = |
7542 | FD->getParamDecl(0)->getType().getNonReferenceType(); |
7543 | |
7544 | ResultList Results; |
7545 | |
7546 | switch (DCK) { |
7547 | case DefaultedComparisonKind::None: |
7548 | llvm_unreachable("not a defaulted comparison")__builtin_unreachable(); |
7549 | |
7550 | case DefaultedComparisonKind::Equal: |
7551 | case DefaultedComparisonKind::ThreeWay: |
7552 | getDerived().visitSubobjects(Results, RD, ParamLvalType.getQualifiers()); |
7553 | return Results; |
7554 | |
7555 | case DefaultedComparisonKind::NotEqual: |
7556 | case DefaultedComparisonKind::Relational: |
7557 | Results.add(getDerived().visitExpandedSubobject( |
7558 | ParamLvalType, getDerived().getCompleteObject())); |
7559 | return Results; |
7560 | } |
7561 | llvm_unreachable("")__builtin_unreachable(); |
7562 | } |
7563 | |
7564 | protected: |
7565 | Derived &getDerived() { return static_cast<Derived&>(*this); } |
7566 | |
7567 | /// Visit the expanded list of subobjects of the given type, as specified in |
7568 | /// C++2a [class.compare.default]. |
7569 | /// |
7570 | /// \return \c true if the ResultList object said we're done, \c false if not. |
7571 | bool visitSubobjects(ResultList &Results, CXXRecordDecl *Record, |
7572 | Qualifiers Quals) { |
7573 | // C++2a [class.compare.default]p4: |
7574 | // The direct base class subobjects of C |
7575 | for (CXXBaseSpecifier &Base : Record->bases()) |
7576 | if (Results.add(getDerived().visitSubobject( |
7577 | S.Context.getQualifiedType(Base.getType(), Quals), |
7578 | getDerived().getBase(&Base)))) |
7579 | return true; |
7580 | |
7581 | // followed by the non-static data members of C |
7582 | for (FieldDecl *Field : Record->fields()) { |
7583 | // Recursively expand anonymous structs. |
7584 | if (Field->isAnonymousStructOrUnion()) { |
7585 | if (visitSubobjects(Results, Field->getType()->getAsCXXRecordDecl(), |
7586 | Quals)) |
7587 | return true; |
7588 | continue; |
7589 | } |
7590 | |
7591 | // Figure out the type of an lvalue denoting this field. |
7592 | Qualifiers FieldQuals = Quals; |
7593 | if (Field->isMutable()) |
7594 | FieldQuals.removeConst(); |
7595 | QualType FieldType = |
7596 | S.Context.getQualifiedType(Field->getType(), FieldQuals); |
7597 | |
7598 | if (Results.add(getDerived().visitSubobject( |
7599 | FieldType, getDerived().getField(Field)))) |
7600 | return true; |
7601 | } |
7602 | |
7603 | // form a list of subobjects. |
7604 | return false; |
7605 | } |
7606 | |
7607 | Result visitSubobject(QualType Type, Subobject Subobj) { |
7608 | // In that list, any subobject of array type is recursively expanded |
7609 | const ArrayType *AT = S.Context.getAsArrayType(Type); |
7610 | if (auto *CAT = dyn_cast_or_null<ConstantArrayType>(AT)) |
7611 | return getDerived().visitSubobjectArray(CAT->getElementType(), |
7612 | CAT->getSize(), Subobj); |
7613 | return getDerived().visitExpandedSubobject(Type, Subobj); |
7614 | } |
7615 | |
7616 | Result visitSubobjectArray(QualType Type, const llvm::APInt &Size, |
7617 | Subobject Subobj) { |
7618 | return getDerived().visitSubobject(Type, Subobj); |
7619 | } |
7620 | |
7621 | protected: |
7622 | Sema &S; |
7623 | CXXRecordDecl *RD; |
7624 | FunctionDecl *FD; |
7625 | DefaultedComparisonKind DCK; |
7626 | UnresolvedSet<16> Fns; |
7627 | }; |
7628 | |
7629 | /// Information about a defaulted comparison, as determined by |
7630 | /// DefaultedComparisonAnalyzer. |
7631 | struct DefaultedComparisonInfo { |
7632 | bool Deleted = false; |
7633 | bool Constexpr = true; |
7634 | ComparisonCategoryType Category = ComparisonCategoryType::StrongOrdering; |
7635 | |
7636 | static DefaultedComparisonInfo deleted() { |
7637 | DefaultedComparisonInfo Deleted; |
7638 | Deleted.Deleted = true; |
7639 | return Deleted; |
7640 | } |
7641 | |
7642 | bool add(const DefaultedComparisonInfo &R) { |
7643 | Deleted |= R.Deleted; |
7644 | Constexpr &= R.Constexpr; |
7645 | Category = commonComparisonType(Category, R.Category); |
7646 | return Deleted; |
7647 | } |
7648 | }; |
7649 | |
7650 | /// An element in the expanded list of subobjects of a defaulted comparison, as |
7651 | /// specified in C++2a [class.compare.default]p4. |
7652 | struct DefaultedComparisonSubobject { |
7653 | enum { CompleteObject, Member, Base } Kind; |
7654 | NamedDecl *Decl; |
7655 | SourceLocation Loc; |
7656 | }; |
7657 | |
7658 | /// A visitor over the notional body of a defaulted comparison that determines |
7659 | /// whether that body would be deleted or constexpr. |
7660 | class DefaultedComparisonAnalyzer |
7661 | : public DefaultedComparisonVisitor<DefaultedComparisonAnalyzer, |
7662 | DefaultedComparisonInfo, |
7663 | DefaultedComparisonInfo, |
7664 | DefaultedComparisonSubobject> { |
7665 | public: |
7666 | enum DiagnosticKind { NoDiagnostics, ExplainDeleted, ExplainConstexpr }; |
7667 | |
7668 | private: |
7669 | DiagnosticKind Diagnose; |
7670 | |
7671 | public: |
7672 | using Base = DefaultedComparisonVisitor; |
7673 | using Result = DefaultedComparisonInfo; |
7674 | using Subobject = DefaultedComparisonSubobject; |
7675 | |
7676 | friend Base; |
7677 | |
7678 | DefaultedComparisonAnalyzer(Sema &S, CXXRecordDecl *RD, FunctionDecl *FD, |
7679 | DefaultedComparisonKind DCK, |
7680 | DiagnosticKind Diagnose = NoDiagnostics) |
7681 | : Base(S, RD, FD, DCK), Diagnose(Diagnose) {} |
7682 | |
7683 | Result visit() { |
7684 | if ((DCK == DefaultedComparisonKind::Equal || |
7685 | DCK == DefaultedComparisonKind::ThreeWay) && |
7686 | RD->hasVariantMembers()) { |
7687 | // C++2a [class.compare.default]p2 [P2002R0]: |
7688 | // A defaulted comparison operator function for class C is defined as |
7689 | // deleted if [...] C has variant members. |
7690 | if (Diagnose == ExplainDeleted) { |
7691 | S.Diag(FD->getLocation(), diag::note_defaulted_comparison_union) |
7692 | << FD << RD->isUnion() << RD; |
7693 | } |
7694 | return Result::deleted(); |
7695 | } |
7696 | |
7697 | return Base::visit(); |
7698 | } |
7699 | |
7700 | private: |
7701 | Subobject getCompleteObject() { |
7702 | return Subobject{Subobject::CompleteObject, RD, FD->getLocation()}; |
7703 | } |
7704 | |
7705 | Subobject getBase(CXXBaseSpecifier *Base) { |
7706 | return Subobject{Subobject::Base, Base->getType()->getAsCXXRecordDecl(), |
7707 | Base->getBaseTypeLoc()}; |
7708 | } |
7709 | |
7710 | Subobject getField(FieldDecl *Field) { |
7711 | return Subobject{Subobject::Member, Field, Field->getLocation()}; |
7712 | } |
7713 | |
7714 | Result visitExpandedSubobject(QualType Type, Subobject Subobj) { |
7715 | // C++2a [class.compare.default]p2 [P2002R0]: |
7716 | // A defaulted <=> or == operator function for class C is defined as |
7717 | // deleted if any non-static data member of C is of reference type |
7718 | if (Type->isReferenceType()) { |
7719 | if (Diagnose == ExplainDeleted) { |
7720 | S.Diag(Subobj.Loc, diag::note_defaulted_comparison_reference_member) |
7721 | << FD << RD; |
7722 | } |
7723 | return Result::deleted(); |
7724 | } |
7725 | |
7726 | // [...] Let xi be an lvalue denoting the ith element [...] |
7727 | OpaqueValueExpr Xi(FD->getLocation(), Type, VK_LValue); |
7728 | Expr *Args[] = {&Xi, &Xi}; |
7729 | |
7730 | // All operators start by trying to apply that same operator recursively. |
7731 | OverloadedOperatorKind OO = FD->getOverloadedOperator(); |
7732 | assert(OO != OO_None && "not an overloaded operator!")((void)0); |
7733 | return visitBinaryOperator(OO, Args, Subobj); |
7734 | } |
7735 | |
7736 | Result |
7737 | visitBinaryOperator(OverloadedOperatorKind OO, ArrayRef<Expr *> Args, |
7738 | Subobject Subobj, |
7739 | OverloadCandidateSet *SpaceshipCandidates = nullptr) { |
7740 | // Note that there is no need to consider rewritten candidates here if |
7741 | // we've already found there is no viable 'operator<=>' candidate (and are |
7742 | // considering synthesizing a '<=>' from '==' and '<'). |
7743 | OverloadCandidateSet CandidateSet( |
7744 | FD->getLocation(), OverloadCandidateSet::CSK_Operator, |
7745 | OverloadCandidateSet::OperatorRewriteInfo( |
7746 | OO, /*AllowRewrittenCandidates=*/!SpaceshipCandidates)); |
7747 | |
7748 | /// C++2a [class.compare.default]p1 [P2002R0]: |
7749 | /// [...] the defaulted function itself is never a candidate for overload |
7750 | /// resolution [...] |
7751 | CandidateSet.exclude(FD); |
7752 | |
7753 | if (Args[0]->getType()->isOverloadableType()) |
7754 | S.LookupOverloadedBinOp(CandidateSet, OO, Fns, Args); |
7755 | else |
7756 | // FIXME: We determine whether this is a valid expression by checking to |
7757 | // see if there's a viable builtin operator candidate for it. That isn't |
7758 | // really what the rules ask us to do, but should give the right results. |
7759 | S.AddBuiltinOperatorCandidates(OO, FD->getLocation(), Args, CandidateSet); |
7760 | |
7761 | Result R; |
7762 | |
7763 | OverloadCandidateSet::iterator Best; |
7764 | switch (CandidateSet.BestViableFunction(S, FD->getLocation(), Best)) { |
7765 | case OR_Success: { |
7766 | // C++2a [class.compare.secondary]p2 [P2002R0]: |
7767 | // The operator function [...] is defined as deleted if [...] the |
7768 | // candidate selected by overload resolution is not a rewritten |
7769 | // candidate. |
7770 | if ((DCK == DefaultedComparisonKind::NotEqual || |
7771 | DCK == DefaultedComparisonKind::Relational) && |
7772 | !Best->RewriteKind) { |
7773 | if (Diagnose == ExplainDeleted) { |
7774 | S.Diag(Best->Function->getLocation(), |
7775 | diag::note_defaulted_comparison_not_rewritten_callee) |
7776 | << FD; |
7777 | } |
7778 | return Result::deleted(); |
7779 | } |
7780 | |
7781 | // Throughout C++2a [class.compare]: if overload resolution does not |
7782 | // result in a usable function, the candidate function is defined as |
7783 | // deleted. This requires that we selected an accessible function. |
7784 | // |
7785 | // Note that this only considers the access of the function when named |
7786 | // within the type of the subobject, and not the access path for any |
7787 | // derived-to-base conversion. |
7788 | CXXRecordDecl *ArgClass = Args[0]->getType()->getAsCXXRecordDecl(); |
7789 | if (ArgClass && Best->FoundDecl.getDecl() && |
7790 | Best->FoundDecl.getDecl()->isCXXClassMember()) { |
7791 | QualType ObjectType = Subobj.Kind == Subobject::Member |
7792 | ? Args[0]->getType() |
7793 | : S.Context.getRecordType(RD); |
7794 | if (!S.isMemberAccessibleForDeletion( |
7795 | ArgClass, Best->FoundDecl, ObjectType, Subobj.Loc, |
7796 | Diagnose == ExplainDeleted |
7797 | ? S.PDiag(diag::note_defaulted_comparison_inaccessible) |
7798 | << FD << Subobj.Kind << Subobj.Decl |
7799 | : S.PDiag())) |
7800 | return Result::deleted(); |
7801 | } |
7802 | |
7803 | bool NeedsDeducing = |
7804 | OO == OO_Spaceship && FD->getReturnType()->isUndeducedAutoType(); |
7805 | |
7806 | if (FunctionDecl *BestFD = Best->Function) { |
7807 | // C++2a [class.compare.default]p3 [P2002R0]: |
7808 | // A defaulted comparison function is constexpr-compatible if |
7809 | // [...] no overlod resolution performed [...] results in a |
7810 | // non-constexpr function. |
7811 | assert(!BestFD->isDeleted() && "wrong overload resolution result")((void)0); |
7812 | // If it's not constexpr, explain why not. |
7813 | if (Diagnose == ExplainConstexpr && !BestFD->isConstexpr()) { |
7814 | if (Subobj.Kind != Subobject::CompleteObject) |
7815 | S.Diag(Subobj.Loc, diag::note_defaulted_comparison_not_constexpr) |
7816 | << Subobj.Kind << Subobj.Decl; |
7817 | S.Diag(BestFD->getLocation(), |
7818 | diag::note_defaulted_comparison_not_constexpr_here); |
7819 | // Bail out after explaining; we don't want any more notes. |
7820 | return Result::deleted(); |
7821 | } |
7822 | R.Constexpr &= BestFD->isConstexpr(); |
7823 | |
7824 | if (NeedsDeducing) { |
7825 | // If any callee has an undeduced return type, deduce it now. |
7826 | // FIXME: It's not clear how a failure here should be handled. For |
7827 | // now, we produce an eager diagnostic, because that is forward |
7828 | // compatible with most (all?) other reasonable options. |
7829 | if (BestFD->getReturnType()->isUndeducedType() && |
7830 | S.DeduceReturnType(BestFD, FD->getLocation(), |
7831 | /*Diagnose=*/false)) { |
7832 | // Don't produce a duplicate error when asked to explain why the |
7833 | // comparison is deleted: we diagnosed that when initially checking |
7834 | // the defaulted operator. |
7835 | if (Diagnose == NoDiagnostics) { |
7836 | S.Diag( |
7837 | FD->getLocation(), |
7838 | diag::err_defaulted_comparison_cannot_deduce_undeduced_auto) |
7839 | << Subobj.Kind << Subobj.Decl; |
7840 | S.Diag( |
7841 | Subobj.Loc, |
7842 | diag::note_defaulted_comparison_cannot_deduce_undeduced_auto) |
7843 | << Subobj.Kind << Subobj.Decl; |
7844 | S.Diag(BestFD->getLocation(), |
7845 | diag::note_defaulted_comparison_cannot_deduce_callee) |
7846 | << Subobj.Kind << Subobj.Decl; |
7847 | } |
7848 | return Result::deleted(); |
7849 | } |
7850 | auto *Info = S.Context.CompCategories.lookupInfoForType( |
7851 | BestFD->getCallResultType()); |
7852 | if (!Info) { |
7853 | if (Diagnose == ExplainDeleted) { |
7854 | S.Diag(Subobj.Loc, diag::note_defaulted_comparison_cannot_deduce) |
7855 | << Subobj.Kind << Subobj.Decl |
7856 | << BestFD->getCallResultType().withoutLocalFastQualifiers(); |
7857 | S.Diag(BestFD->getLocation(), |
7858 | diag::note_defaulted_comparison_cannot_deduce_callee) |
7859 | << Subobj.Kind << Subobj.Decl; |
7860 | } |
7861 | return Result::deleted(); |
7862 | } |
7863 | R.Category = Info->Kind; |
7864 | } |
7865 | } else { |
7866 | QualType T = Best->BuiltinParamTypes[0]; |
7867 | assert(T == Best->BuiltinParamTypes[1] &&((void)0) |
7868 | "builtin comparison for different types?")((void)0); |
7869 | assert(Best->BuiltinParamTypes[2].isNull() &&((void)0) |
7870 | "invalid builtin comparison")((void)0); |
7871 | |
7872 | if (NeedsDeducing) { |
7873 | Optional<ComparisonCategoryType> Cat = |
7874 | getComparisonCategoryForBuiltinCmp(T); |
7875 | assert(Cat && "no category for builtin comparison?")((void)0); |
7876 | R.Category = *Cat; |
7877 | } |
7878 | } |
7879 | |
7880 | // Note that we might be rewriting to a different operator. That call is |
7881 | // not considered until we come to actually build the comparison function. |
7882 | break; |
7883 | } |
7884 | |
7885 | case OR_Ambiguous: |
7886 | if (Diagnose == ExplainDeleted) { |
7887 | unsigned Kind = 0; |
7888 | if (FD->getOverloadedOperator() == OO_Spaceship && OO != OO_Spaceship) |
7889 | Kind = OO == OO_EqualEqual ? 1 : 2; |
7890 | CandidateSet.NoteCandidates( |
7891 | PartialDiagnosticAt( |
7892 | Subobj.Loc, S.PDiag(diag::note_defaulted_comparison_ambiguous) |
7893 | << FD << Kind << Subobj.Kind << Subobj.Decl), |
7894 | S, OCD_AmbiguousCandidates, Args); |
7895 | } |
7896 | R = Result::deleted(); |
7897 | break; |
7898 | |
7899 | case OR_Deleted: |
7900 | if (Diagnose == ExplainDeleted) { |
7901 | if ((DCK == DefaultedComparisonKind::NotEqual || |
7902 | DCK == DefaultedComparisonKind::Relational) && |
7903 | !Best->RewriteKind) { |
7904 | S.Diag(Best->Function->getLocation(), |
7905 | diag::note_defaulted_comparison_not_rewritten_callee) |
7906 | << FD; |
7907 | } else { |
7908 | S.Diag(Subobj.Loc, |
7909 | diag::note_defaulted_comparison_calls_deleted) |
7910 | << FD << Subobj.Kind << Subobj.Decl; |
7911 | S.NoteDeletedFunction(Best->Function); |
7912 | } |
7913 | } |
7914 | R = Result::deleted(); |
7915 | break; |
7916 | |
7917 | case OR_No_Viable_Function: |
7918 | // If there's no usable candidate, we're done unless we can rewrite a |
7919 | // '<=>' in terms of '==' and '<'. |
7920 | if (OO == OO_Spaceship && |
7921 | S.Context.CompCategories.lookupInfoForType(FD->getReturnType())) { |
7922 | // For any kind of comparison category return type, we need a usable |
7923 | // '==' and a usable '<'. |
7924 | if (!R.add(visitBinaryOperator(OO_EqualEqual, Args, Subobj, |
7925 | &CandidateSet))) |
7926 | R.add(visitBinaryOperator(OO_Less, Args, Subobj, &CandidateSet)); |
7927 | break; |
7928 | } |
7929 | |
7930 | if (Diagnose == ExplainDeleted) { |
7931 | S.Diag(Subobj.Loc, diag::note_defaulted_comparison_no_viable_function) |
7932 | << FD << Subobj.Kind << Subobj.Decl; |
7933 | |
7934 | // For a three-way comparison, list both the candidates for the |
7935 | // original operator and the candidates for the synthesized operator. |
7936 | if (SpaceshipCandidates) { |
7937 | SpaceshipCandidates->NoteCandidates( |
7938 | S, Args, |
7939 | SpaceshipCandidates->CompleteCandidates(S, OCD_AllCandidates, |
7940 | Args, FD->getLocation())); |
7941 | S.Diag(Subobj.Loc, |
7942 | diag::note_defaulted_comparison_no_viable_function_synthesized) |
7943 | << (OO == OO_EqualEqual ? 0 : 1); |
7944 | } |
7945 | |
7946 | CandidateSet.NoteCandidates( |
7947 | S, Args, |
7948 | CandidateSet.CompleteCandidates(S, OCD_AllCandidates, Args, |
7949 | FD->getLocation())); |
7950 | } |
7951 | R = Result::deleted(); |
7952 | break; |
7953 | } |
7954 | |
7955 | return R; |
7956 | } |
7957 | }; |
7958 | |
7959 | /// A list of statements. |
7960 | struct StmtListResult { |
7961 | bool IsInvalid = false; |
7962 | llvm::SmallVector<Stmt*, 16> Stmts; |
7963 | |
7964 | bool add(const StmtResult &S) { |
7965 | IsInvalid |= S.isInvalid(); |
7966 | if (IsInvalid) |
7967 | return true; |
7968 | Stmts.push_back(S.get()); |
7969 | return false; |
7970 | } |
7971 | }; |
7972 | |
7973 | /// A visitor over the notional body of a defaulted comparison that synthesizes |
7974 | /// the actual body. |
7975 | class DefaultedComparisonSynthesizer |
7976 | : public DefaultedComparisonVisitor<DefaultedComparisonSynthesizer, |
7977 | StmtListResult, StmtResult, |
7978 | std::pair<ExprResult, ExprResult>> { |
7979 | SourceLocation Loc; |
7980 | unsigned ArrayDepth = 0; |
7981 | |
7982 | public: |
7983 | using Base = DefaultedComparisonVisitor; |
7984 | using ExprPair = std::pair<ExprResult, ExprResult>; |
7985 | |
7986 | friend Base; |
7987 | |
7988 | DefaultedComparisonSynthesizer(Sema &S, CXXRecordDecl *RD, FunctionDecl *FD, |
7989 | DefaultedComparisonKind DCK, |
7990 | SourceLocation BodyLoc) |
7991 | : Base(S, RD, FD, DCK), Loc(BodyLoc) {} |
7992 | |
7993 | /// Build a suitable function body for this defaulted comparison operator. |
7994 | StmtResult build() { |
7995 | Sema::CompoundScopeRAII CompoundScope(S); |
7996 | |
7997 | StmtListResult Stmts = visit(); |
7998 | if (Stmts.IsInvalid) |
7999 | return StmtError(); |
8000 | |
8001 | ExprResult RetVal; |
8002 | switch (DCK) { |
8003 | case DefaultedComparisonKind::None: |
8004 | llvm_unreachable("not a defaulted comparison")__builtin_unreachable(); |
8005 | |
8006 | case DefaultedComparisonKind::Equal: { |
8007 | // C++2a [class.eq]p3: |
8008 | // [...] compar[e] the corresponding elements [...] until the first |
8009 | // index i where xi == yi yields [...] false. If no such index exists, |
8010 | // V is true. Otherwise, V is false. |
8011 | // |
8012 | // Join the comparisons with '&&'s and return the result. Use a right |
8013 | // fold (traversing the conditions right-to-left), because that |
8014 | // short-circuits more naturally. |
8015 | auto OldStmts = std::move(Stmts.Stmts); |
8016 | Stmts.Stmts.clear(); |
8017 | ExprResult CmpSoFar; |
8018 | // Finish a particular comparison chain. |
8019 | auto FinishCmp = [&] { |
8020 | if (Expr *Prior = CmpSoFar.get()) { |
8021 | // Convert the last expression to 'return ...;' |
8022 | if (RetVal.isUnset() && Stmts.Stmts.empty()) |
8023 | RetVal = CmpSoFar; |
8024 | // Convert any prior comparison to 'if (!(...)) return false;' |
8025 | else if (Stmts.add(buildIfNotCondReturnFalse(Prior))) |
8026 | return true; |
8027 | CmpSoFar = ExprResult(); |
8028 | } |
8029 | return false; |
8030 | }; |
8031 | for (Stmt *EAsStmt : llvm::reverse(OldStmts)) { |
8032 | Expr *E = dyn_cast<Expr>(EAsStmt); |
8033 | if (!E) { |
8034 | // Found an array comparison. |
8035 | if (FinishCmp() || Stmts.add(EAsStmt)) |
8036 | return StmtError(); |
8037 | continue; |
8038 | } |
8039 | |
8040 | if (CmpSoFar.isUnset()) { |
8041 | CmpSoFar = E; |
8042 | continue; |
8043 | } |
8044 | CmpSoFar = S.CreateBuiltinBinOp(Loc, BO_LAnd, E, CmpSoFar.get()); |
8045 | if (CmpSoFar.isInvalid()) |
8046 | return StmtError(); |
8047 | } |
8048 | if (FinishCmp()) |
8049 | return StmtError(); |
8050 | std::reverse(Stmts.Stmts.begin(), Stmts.Stmts.end()); |
8051 | // If no such index exists, V is true. |
8052 | if (RetVal.isUnset()) |
8053 | RetVal = S.ActOnCXXBoolLiteral(Loc, tok::kw_true); |
8054 | break; |
8055 | } |
8056 | |
8057 | case DefaultedComparisonKind::ThreeWay: { |
8058 | // Per C++2a [class.spaceship]p3, as a fallback add: |
8059 | // return static_cast<R>(std::strong_ordering::equal); |
8060 | QualType StrongOrdering = S.CheckComparisonCategoryType( |
8061 | ComparisonCategoryType::StrongOrdering, Loc, |
8062 | Sema::ComparisonCategoryUsage::DefaultedOperator); |
8063 | if (StrongOrdering.isNull()) |
8064 | return StmtError(); |
8065 | VarDecl *EqualVD = S.Context.CompCategories.getInfoForType(StrongOrdering) |
8066 | .getValueInfo(ComparisonCategoryResult::Equal) |
8067 | ->VD; |
8068 | RetVal = getDecl(EqualVD); |
8069 | if (RetVal.isInvalid()) |
8070 | return StmtError(); |
8071 | RetVal = buildStaticCastToR(RetVal.get()); |
8072 | break; |
8073 | } |
8074 | |
8075 | case DefaultedComparisonKind::NotEqual: |
8076 | case DefaultedComparisonKind::Relational: |
8077 | RetVal = cast<Expr>(Stmts.Stmts.pop_back_val()); |
8078 | break; |
8079 | } |
8080 | |
8081 | // Build the final return statement. |
8082 | if (RetVal.isInvalid()) |
8083 | return StmtError(); |
8084 | StmtResult ReturnStmt = S.BuildReturnStmt(Loc, RetVal.get()); |
8085 | if (ReturnStmt.isInvalid()) |
8086 | return StmtError(); |
8087 | Stmts.Stmts.push_back(ReturnStmt.get()); |
8088 | |
8089 | return S.ActOnCompoundStmt(Loc, Loc, Stmts.Stmts, /*IsStmtExpr=*/false); |
8090 | } |
8091 | |
8092 | private: |
8093 | ExprResult getDecl(ValueDecl *VD) { |
8094 | return S.BuildDeclarationNameExpr( |
8095 | CXXScopeSpec(), DeclarationNameInfo(VD->getDeclName(), Loc), VD); |
8096 | } |
8097 | |
8098 | ExprResult getParam(unsigned I) { |
8099 | ParmVarDecl *PD = FD->getParamDecl(I); |
8100 | return getDecl(PD); |
8101 | } |
8102 | |
8103 | ExprPair getCompleteObject() { |
8104 | unsigned Param = 0; |
8105 | ExprResult LHS; |
8106 | if (isa<CXXMethodDecl>(FD)) { |
8107 | // LHS is '*this'. |
8108 | LHS = S.ActOnCXXThis(Loc); |
8109 | if (!LHS.isInvalid()) |
8110 | LHS = S.CreateBuiltinUnaryOp(Loc, UO_Deref, LHS.get()); |
8111 | } else { |
8112 | LHS = getParam(Param++); |
8113 | } |
8114 | ExprResult RHS = getParam(Param++); |
8115 | assert(Param == FD->getNumParams())((void)0); |
8116 | return {LHS, RHS}; |
8117 | } |
8118 | |
8119 | ExprPair getBase(CXXBaseSpecifier *Base) { |
8120 | ExprPair Obj = getCompleteObject(); |
8121 | if (Obj.first.isInvalid() || Obj.second.isInvalid()) |
8122 | return {ExprError(), ExprError()}; |
8123 | CXXCastPath Path = {Base}; |
8124 | return {S.ImpCastExprToType(Obj.first.get(), Base->getType(), |
8125 | CK_DerivedToBase, VK_LValue, &Path), |
8126 | S.ImpCastExprToType(Obj.second.get(), Base->getType(), |
8127 | CK_DerivedToBase, VK_LValue, &Path)}; |
8128 | } |
8129 | |
8130 | ExprPair getField(FieldDecl *Field) { |
8131 | ExprPair Obj = getCompleteObject(); |
8132 | if (Obj.first.isInvalid() || Obj.second.isInvalid()) |
8133 | return {ExprError(), ExprError()}; |
8134 | |
8135 | DeclAccessPair Found = DeclAccessPair::make(Field, Field->getAccess()); |
8136 | DeclarationNameInfo NameInfo(Field->getDeclName(), Loc); |
8137 | return {S.BuildFieldReferenceExpr(Obj.first.get(), /*IsArrow=*/false, Loc, |
8138 | CXXScopeSpec(), Field, Found, NameInfo), |
8139 | S.BuildFieldReferenceExpr(Obj.second.get(), /*IsArrow=*/false, Loc, |
8140 | CXXScopeSpec(), Field, Found, NameInfo)}; |
8141 | } |
8142 | |
8143 | // FIXME: When expanding a subobject, register a note in the code synthesis |
8144 | // stack to say which subobject we're comparing. |
8145 | |
8146 | StmtResult buildIfNotCondReturnFalse(ExprResult Cond) { |
8147 | if (Cond.isInvalid()) |
8148 | return StmtError(); |
8149 | |
8150 | ExprResult NotCond = S.CreateBuiltinUnaryOp(Loc, UO_LNot, Cond.get()); |
8151 | if (NotCond.isInvalid()) |
8152 | return StmtError(); |
8153 | |
8154 | ExprResult False = S.ActOnCXXBoolLiteral(Loc, tok::kw_false); |
8155 | assert(!False.isInvalid() && "should never fail")((void)0); |
8156 | StmtResult ReturnFalse = S.BuildReturnStmt(Loc, False.get()); |
8157 | if (ReturnFalse.isInvalid()) |
8158 | return StmtError(); |
8159 | |
8160 | return S.ActOnIfStmt(Loc, false, Loc, nullptr, |
8161 | S.ActOnCondition(nullptr, Loc, NotCond.get(), |
8162 | Sema::ConditionKind::Boolean), |
8163 | Loc, ReturnFalse.get(), SourceLocation(), nullptr); |
8164 | } |
8165 | |
8166 | StmtResult visitSubobjectArray(QualType Type, llvm::APInt Size, |
8167 | ExprPair Subobj) { |
8168 | QualType SizeType = S.Context.getSizeType(); |
8169 | Size = Size.zextOrTrunc(S.Context.getTypeSize(SizeType)); |
8170 | |
8171 | // Build 'size_t i$n = 0'. |
8172 | IdentifierInfo *IterationVarName = nullptr; |
8173 | { |
8174 | SmallString<8> Str; |
8175 | llvm::raw_svector_ostream OS(Str); |
8176 | OS << "i" << ArrayDepth; |
8177 | IterationVarName = &S.Context.Idents.get(OS.str()); |
8178 | } |
8179 | VarDecl *IterationVar = VarDecl::Create( |
8180 | S.Context, S.CurContext, Loc, Loc, IterationVarName, SizeType, |
8181 | S.Context.getTrivialTypeSourceInfo(SizeType, Loc), SC_None); |
8182 | llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); |
8183 | IterationVar->setInit( |
8184 | IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); |
8185 | Stmt *Init = new (S.Context) DeclStmt(DeclGroupRef(IterationVar), Loc, Loc); |
8186 | |
8187 | auto IterRef = [&] { |
8188 | ExprResult Ref = S.BuildDeclarationNameExpr( |
8189 | CXXScopeSpec(), DeclarationNameInfo(IterationVarName, Loc), |
8190 | IterationVar); |
8191 | assert(!Ref.isInvalid() && "can't reference our own variable?")((void)0); |
8192 | return Ref.get(); |
8193 | }; |
8194 | |
8195 | // Build 'i$n != Size'. |
8196 | ExprResult Cond = S.CreateBuiltinBinOp( |
8197 | Loc, BO_NE, IterRef(), |
8198 | IntegerLiteral::Create(S.Context, Size, SizeType, Loc)); |
8199 | assert(!Cond.isInvalid() && "should never fail")((void)0); |
8200 | |
8201 | // Build '++i$n'. |
8202 | ExprResult Inc = S.CreateBuiltinUnaryOp(Loc, UO_PreInc, IterRef()); |
8203 | assert(!Inc.isInvalid() && "should never fail")((void)0); |
8204 | |
8205 | // Build 'a[i$n]' and 'b[i$n]'. |
8206 | auto Index = [&](ExprResult E) { |
8207 | if (E.isInvalid()) |
8208 | return ExprError(); |
8209 | return S.CreateBuiltinArraySubscriptExpr(E.get(), Loc, IterRef(), Loc); |
8210 | }; |
8211 | Subobj.first = Index(Subobj.first); |
8212 | Subobj.second = Index(Subobj.second); |
8213 | |
8214 | // Compare the array elements. |
8215 | ++ArrayDepth; |
8216 | StmtResult Substmt = visitSubobject(Type, Subobj); |
8217 | --ArrayDepth; |
8218 | |
8219 | if (Substmt.isInvalid()) |
8220 | return StmtError(); |
8221 | |
8222 | // For the inner level of an 'operator==', build 'if (!cmp) return false;'. |
8223 | // For outer levels or for an 'operator<=>' we already have a suitable |
8224 | // statement that returns as necessary. |
8225 | if (Expr *ElemCmp = dyn_cast<Expr>(Substmt.get())) { |
8226 | assert(DCK == DefaultedComparisonKind::Equal &&((void)0) |
8227 | "should have non-expression statement")((void)0); |
8228 | Substmt = buildIfNotCondReturnFalse(ElemCmp); |
8229 | if (Substmt.isInvalid()) |
8230 | return StmtError(); |
8231 | } |
8232 | |
8233 | // Build 'for (...) ...' |
8234 | return S.ActOnForStmt(Loc, Loc, Init, |
8235 | S.ActOnCondition(nullptr, Loc, Cond.get(), |
8236 | Sema::ConditionKind::Boolean), |
8237 | S.MakeFullDiscardedValueExpr(Inc.get()), Loc, |
8238 | Substmt.get()); |
8239 | } |
8240 | |
8241 | StmtResult visitExpandedSubobject(QualType Type, ExprPair Obj) { |
8242 | if (Obj.first.isInvalid() || Obj.second.isInvalid()) |
8243 | return StmtError(); |
8244 | |
8245 | OverloadedOperatorKind OO = FD->getOverloadedOperator(); |
8246 | BinaryOperatorKind Opc = BinaryOperator::getOverloadedOpcode(OO); |
8247 | ExprResult Op; |
8248 | if (Type->isOverloadableType()) |
8249 | Op = S.CreateOverloadedBinOp(Loc, Opc, Fns, Obj.first.get(), |
8250 | Obj.second.get(), /*PerformADL=*/true, |
8251 | /*AllowRewrittenCandidates=*/true, FD); |
8252 | else |
8253 | Op = S.CreateBuiltinBinOp(Loc, Opc, Obj.first.get(), Obj.second.get()); |
8254 | if (Op.isInvalid()) |
8255 | return StmtError(); |
8256 | |
8257 | switch (DCK) { |
8258 | case DefaultedComparisonKind::None: |
8259 | llvm_unreachable("not a defaulted comparison")__builtin_unreachable(); |
8260 | |
8261 | case DefaultedComparisonKind::Equal: |
8262 | // Per C++2a [class.eq]p2, each comparison is individually contextually |
8263 | // converted to bool. |
8264 | Op = S.PerformContextuallyConvertToBool(Op.get()); |
8265 | if (Op.isInvalid()) |
8266 | return StmtError(); |
8267 | return Op.get(); |
8268 | |
8269 | case DefaultedComparisonKind::ThreeWay: { |
8270 | // Per C++2a [class.spaceship]p3, form: |
8271 | // if (R cmp = static_cast<R>(op); cmp != 0) |
8272 | // return cmp; |
8273 | QualType R = FD->getReturnType(); |
8274 | Op = buildStaticCastToR(Op.get()); |
8275 | if (Op.isInvalid()) |
8276 | return StmtError(); |
8277 | |
8278 | // R cmp = ...; |
8279 | IdentifierInfo *Name = &S.Context.Idents.get("cmp"); |
8280 | VarDecl *VD = |
8281 | VarDecl::Create(S.Context, S.CurContext, Loc, Loc, Name, R, |
8282 | S.Context.getTrivialTypeSourceInfo(R, Loc), SC_None); |
8283 | S.AddInitializerToDecl(VD, Op.get(), /*DirectInit=*/false); |
8284 | Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(VD), Loc, Loc); |
8285 | |
8286 | // cmp != 0 |
8287 | ExprResult VDRef = getDecl(VD); |
8288 | if (VDRef.isInvalid()) |
8289 | return StmtError(); |
8290 | llvm::APInt ZeroVal(S.Context.getIntWidth(S.Context.IntTy), 0); |
8291 | Expr *Zero = |
8292 | IntegerLiteral::Create(S.Context, ZeroVal, S.Context.IntTy, Loc); |
8293 | ExprResult Comp; |
8294 | if (VDRef.get()->getType()->isOverloadableType()) |
8295 | Comp = S.CreateOverloadedBinOp(Loc, BO_NE, Fns, VDRef.get(), Zero, true, |
8296 | true, FD); |
8297 | else |
8298 | Comp = S.CreateBuiltinBinOp(Loc, BO_NE, VDRef.get(), Zero); |
8299 | if (Comp.isInvalid()) |
8300 | return StmtError(); |
8301 | Sema::ConditionResult Cond = S.ActOnCondition( |
8302 | nullptr, Loc, Comp.get(), Sema::ConditionKind::Boolean); |
8303 | if (Cond.isInvalid()) |
8304 | return StmtError(); |
8305 | |
8306 | // return cmp; |
8307 | VDRef = getDecl(VD); |
8308 | if (VDRef.isInvalid()) |
8309 | return StmtError(); |
8310 | StmtResult ReturnStmt = S.BuildReturnStmt(Loc, VDRef.get()); |
8311 | if (ReturnStmt.isInvalid()) |
8312 | return StmtError(); |
8313 | |
8314 | // if (...) |
8315 | return S.ActOnIfStmt(Loc, /*IsConstexpr=*/false, Loc, InitStmt, Cond, Loc, |
8316 | ReturnStmt.get(), |
8317 | /*ElseLoc=*/SourceLocation(), /*Else=*/nullptr); |
8318 | } |
8319 | |
8320 | case DefaultedComparisonKind::NotEqual: |
8321 | case DefaultedComparisonKind::Relational: |
8322 | // C++2a [class.compare.secondary]p2: |
8323 | // Otherwise, the operator function yields x @ y. |
8324 | return Op.get(); |
8325 | } |
8326 | llvm_unreachable("")__builtin_unreachable(); |
8327 | } |
8328 | |
8329 | /// Build "static_cast<R>(E)". |
8330 | ExprResult buildStaticCastToR(Expr *E) { |
8331 | QualType R = FD->getReturnType(); |
8332 | assert(!R->isUndeducedType() && "type should have been deduced already")((void)0); |
8333 | |
8334 | // Don't bother forming a no-op cast in the common case. |
8335 | if (E->isPRValue() && S.Context.hasSameType(E->getType(), R)) |
8336 | return E; |
8337 | return S.BuildCXXNamedCast(Loc, tok::kw_static_cast, |
8338 | S.Context.getTrivialTypeSourceInfo(R, Loc), E, |
8339 | SourceRange(Loc, Loc), SourceRange(Loc, Loc)); |
8340 | } |
8341 | }; |
8342 | } |
8343 | |
8344 | /// Perform the unqualified lookups that might be needed to form a defaulted |
8345 | /// comparison function for the given operator. |
8346 | static void lookupOperatorsForDefaultedComparison(Sema &Self, Scope *S, |
8347 | UnresolvedSetImpl &Operators, |
8348 | OverloadedOperatorKind Op) { |
8349 | auto Lookup = [&](OverloadedOperatorKind OO) { |
8350 | Self.LookupOverloadedOperatorName(OO, S, Operators); |
8351 | }; |
8352 | |
8353 | // Every defaulted operator looks up itself. |
8354 | Lookup(Op); |
8355 | // ... and the rewritten form of itself, if any. |
8356 | if (OverloadedOperatorKind ExtraOp = getRewrittenOverloadedOperator(Op)) |
8357 | Lookup(ExtraOp); |
8358 | |
8359 | // For 'operator<=>', we also form a 'cmp != 0' expression, and might |
8360 | // synthesize a three-way comparison from '<' and '=='. In a dependent |
8361 | // context, we also need to look up '==' in case we implicitly declare a |
8362 | // defaulted 'operator=='. |
8363 | if (Op == OO_Spaceship) { |
8364 | Lookup(OO_ExclaimEqual); |
8365 | Lookup(OO_Less); |
8366 | Lookup(OO_EqualEqual); |
8367 | } |
8368 | } |
8369 | |
8370 | bool Sema::CheckExplicitlyDefaultedComparison(Scope *S, FunctionDecl *FD, |
8371 | DefaultedComparisonKind DCK) { |
8372 | assert(DCK != DefaultedComparisonKind::None && "not a defaulted comparison")((void)0); |
8373 | |
8374 | CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(FD->getLexicalDeclContext()); |
8375 | assert(RD && "defaulted comparison is not defaulted in a class")((void)0); |
8376 | |
8377 | // Perform any unqualified lookups we're going to need to default this |
8378 | // function. |
8379 | if (S) { |
8380 | UnresolvedSet<32> Operators; |
8381 | lookupOperatorsForDefaultedComparison(*this, S, Operators, |
8382 | FD->getOverloadedOperator()); |
8383 | FD->setDefaultedFunctionInfo(FunctionDecl::DefaultedFunctionInfo::Create( |
8384 | Context, Operators.pairs())); |
8385 | } |
8386 | |
8387 | // C++2a [class.compare.default]p1: |
8388 | // A defaulted comparison operator function for some class C shall be a |
8389 | // non-template function declared in the member-specification of C that is |
8390 | // -- a non-static const member of C having one parameter of type |
8391 | // const C&, or |
8392 | // -- a friend of C having two parameters of type const C& or two |
8393 | // parameters of type C. |
8394 | QualType ExpectedParmType1 = Context.getRecordType(RD); |
8395 | QualType ExpectedParmType2 = |
8396 | Context.getLValueReferenceType(ExpectedParmType1.withConst()); |
8397 | if (isa<CXXMethodDecl>(FD)) |
8398 | ExpectedParmType1 = ExpectedParmType2; |
8399 | for (const ParmVarDecl *Param : FD->parameters()) { |
8400 | if (!Param->getType()->isDependentType() && |
8401 | !Context.hasSameType(Param->getType(), ExpectedParmType1) && |
8402 | !Context.hasSameType(Param->getType(), ExpectedParmType2)) { |
8403 | // Don't diagnose an implicit 'operator=='; we will have diagnosed the |
8404 | // corresponding defaulted 'operator<=>' already. |
8405 | if (!FD->isImplicit()) { |
8406 | Diag(FD->getLocation(), diag::err_defaulted_comparison_param) |
8407 | << (int)DCK << Param->getType() << ExpectedParmType1 |
8408 | << !isa<CXXMethodDecl>(FD) |
8409 | << ExpectedParmType2 << Param->getSourceRange(); |
8410 | } |
8411 | return true; |
8412 | } |
8413 | } |
8414 | if (FD->getNumParams() == 2 && |
8415 | !Context.hasSameType(FD->getParamDecl(0)->getType(), |
8416 | FD->getParamDecl(1)->getType())) { |
8417 | if (!FD->isImplicit()) { |
8418 | Diag(FD->getLocation(), diag::err_defaulted_comparison_param_mismatch) |
8419 | << (int)DCK |
8420 | << FD->getParamDecl(0)->getType() |
8421 | << FD->getParamDecl(0)->getSourceRange() |
8422 | << FD->getParamDecl(1)->getType() |
8423 | << FD->getParamDecl(1)->getSourceRange(); |
8424 | } |
8425 | return true; |
8426 | } |
8427 | |
8428 | // ... non-static const member ... |
8429 | if (auto *MD = dyn_cast<CXXMethodDecl>(FD)) { |
8430 | assert(!MD->isStatic() && "comparison function cannot be a static member")((void)0); |
8431 | if (!MD->isConst()) { |
8432 | SourceLocation InsertLoc; |
8433 | if (FunctionTypeLoc Loc = MD->getFunctionTypeLoc()) |
8434 | InsertLoc = getLocForEndOfToken(Loc.getRParenLoc()); |
8435 | // Don't diagnose an implicit 'operator=='; we will have diagnosed the |
8436 | // corresponding defaulted 'operator<=>' already. |
8437 | if (!MD->isImplicit()) { |
8438 | Diag(MD->getLocation(), diag::err_defaulted_comparison_non_const) |
8439 | << (int)DCK << FixItHint::CreateInsertion(InsertLoc, " const"); |
8440 | } |
8441 | |
8442 | // Add the 'const' to the type to recover. |
8443 | const auto *FPT = MD->getType()->castAs<FunctionProtoType>(); |
8444 | FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); |
8445 | EPI.TypeQuals.addConst(); |
8446 | MD->setType(Context.getFunctionType(FPT->getReturnType(), |
8447 | FPT->getParamTypes(), EPI)); |
8448 | } |
8449 | } else { |
8450 | // A non-member function declared in a class must be a friend. |
8451 | assert(FD->getFriendObjectKind() && "expected a friend declaration")((void)0); |
8452 | } |
8453 | |
8454 | // C++2a [class.eq]p1, [class.rel]p1: |
8455 | // A [defaulted comparison other than <=>] shall have a declared return |
8456 | // type bool. |
8457 | if (DCK != DefaultedComparisonKind::ThreeWay && |
8458 | !FD->getDeclaredReturnType()->isDependentType() && |
8459 | !Context.hasSameType(FD->getDeclaredReturnType(), Context.BoolTy)) { |
8460 | Diag(FD->getLocation(), diag::err_defaulted_comparison_return_type_not_bool) |
8461 | << (int)DCK << FD->getDeclaredReturnType() << Context.BoolTy |
8462 | << FD->getReturnTypeSourceRange(); |
8463 | return true; |
8464 | } |
8465 | // C++2a [class.spaceship]p2 [P2002R0]: |
8466 | // Let R be the declared return type [...]. If R is auto, [...]. Otherwise, |
8467 | // R shall not contain a placeholder type. |
8468 | if (DCK == DefaultedComparisonKind::ThreeWay && |
8469 | FD->getDeclaredReturnType()->getContainedDeducedType() && |
8470 | !Context.hasSameType(FD->getDeclaredReturnType(), |
8471 | Context.getAutoDeductType())) { |
8472 | Diag(FD->getLocation(), |
8473 | diag::err_defaulted_comparison_deduced_return_type_not_auto) |
8474 | << (int)DCK << FD->getDeclaredReturnType() << Context.AutoDeductTy |
8475 | << FD->getReturnTypeSourceRange(); |
8476 | return true; |
8477 | } |
8478 | |
8479 | // For a defaulted function in a dependent class, defer all remaining checks |
8480 | // until instantiation. |
8481 | if (RD->isDependentType()) |
8482 | return false; |
8483 | |
8484 | // Determine whether the function should be defined as deleted. |
8485 | DefaultedComparisonInfo Info = |
8486 | DefaultedComparisonAnalyzer(*this, RD, FD, DCK).visit(); |
8487 | |
8488 | bool First = FD == FD->getCanonicalDecl(); |
8489 | |
8490 | // If we want to delete the function, then do so; there's nothing else to |
8491 | // check in that case. |
8492 | if (Info.Deleted) { |
8493 | if (!First) { |
8494 | // C++11 [dcl.fct.def.default]p4: |
8495 | // [For a] user-provided explicitly-defaulted function [...] if such a |
8496 | // function is implicitly defined as deleted, the program is ill-formed. |
8497 | // |
8498 | // This is really just a consequence of the general rule that you can |
8499 | // only delete a function on its first declaration. |
8500 | Diag(FD->getLocation(), diag::err_non_first_default_compare_deletes) |
8501 | << FD->isImplicit() << (int)DCK; |
8502 | DefaultedComparisonAnalyzer(*this, RD, FD, DCK, |
8503 | DefaultedComparisonAnalyzer::ExplainDeleted) |
8504 | .visit(); |
8505 | return true; |
8506 | } |
8507 | |
8508 | SetDeclDeleted(FD, FD->getLocation()); |
8509 | if (!inTemplateInstantiation() && !FD->isImplicit()) { |
8510 | Diag(FD->getLocation(), diag::warn_defaulted_comparison_deleted) |
8511 | << (int)DCK; |
8512 | DefaultedComparisonAnalyzer(*this, RD, FD, DCK, |
8513 | DefaultedComparisonAnalyzer::ExplainDeleted) |
8514 | .visit(); |
8515 | } |
8516 | return false; |
8517 | } |
8518 | |
8519 | // C++2a [class.spaceship]p2: |
8520 | // The return type is deduced as the common comparison type of R0, R1, ... |
8521 | if (DCK == DefaultedComparisonKind::ThreeWay && |
8522 | FD->getDeclaredReturnType()->isUndeducedAutoType()) { |
8523 | SourceLocation RetLoc = FD->getReturnTypeSourceRange().getBegin(); |
8524 | if (RetLoc.isInvalid()) |
8525 | RetLoc = FD->getBeginLoc(); |
8526 | // FIXME: Should we really care whether we have the complete type and the |
8527 | // 'enumerator' constants here? A forward declaration seems sufficient. |
8528 | QualType Cat = CheckComparisonCategoryType( |
8529 | Info.Category, RetLoc, ComparisonCategoryUsage::DefaultedOperator); |
8530 | if (Cat.isNull()) |
8531 | return true; |
8532 | Context.adjustDeducedFunctionResultType( |
8533 | FD, SubstAutoType(FD->getDeclaredReturnType(), Cat)); |
8534 | } |
8535 | |
8536 | // C++2a [dcl.fct.def.default]p3 [P2002R0]: |
8537 | // An explicitly-defaulted function that is not defined as deleted may be |
8538 | // declared constexpr or consteval only if it is constexpr-compatible. |
8539 | // C++2a [class.compare.default]p3 [P2002R0]: |
8540 | // A defaulted comparison function is constexpr-compatible if it satisfies |
8541 | // the requirements for a constexpr function [...] |
8542 | // The only relevant requirements are that the parameter and return types are |
8543 | // literal types. The remaining conditions are checked by the analyzer. |
8544 | if (FD->isConstexpr()) { |
8545 | if (CheckConstexprReturnType(*this, FD, CheckConstexprKind::Diagnose) && |
8546 | CheckConstexprParameterTypes(*this, FD, CheckConstexprKind::Diagnose) && |
8547 | !Info.Constexpr) { |
8548 | Diag(FD->getBeginLoc(), |
8549 | diag::err_incorrect_defaulted_comparison_constexpr) |
8550 | << FD->isImplicit() << (int)DCK << FD->isConsteval(); |
8551 | DefaultedComparisonAnalyzer(*this, RD, FD, DCK, |
8552 | DefaultedComparisonAnalyzer::ExplainConstexpr) |
8553 | .visit(); |
8554 | } |
8555 | } |
8556 | |
8557 | // C++2a [dcl.fct.def.default]p3 [P2002R0]: |
8558 | // If a constexpr-compatible function is explicitly defaulted on its first |
8559 | // declaration, it is implicitly considered to be constexpr. |
8560 | // FIXME: Only applying this to the first declaration seems problematic, as |
8561 | // simple reorderings can affect the meaning of the program. |
8562 | if (First && !FD->isConstexpr() && Info.Constexpr) |
8563 | FD->setConstexprKind(ConstexprSpecKind::Constexpr); |
8564 | |
8565 | // C++2a [except.spec]p3: |
8566 | // If a declaration of a function does not have a noexcept-specifier |
8567 | // [and] is defaulted on its first declaration, [...] the exception |
8568 | // specification is as specified below |
8569 | if (FD->getExceptionSpecType() == EST_None) { |
8570 | auto *FPT = FD->getType()->castAs<FunctionProtoType>(); |
8571 | FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); |
8572 | EPI.ExceptionSpec.Type = EST_Unevaluated; |
8573 | EPI.ExceptionSpec.SourceDecl = FD; |
8574 | FD->setType(Context.getFunctionType(FPT->getReturnType(), |
8575 | FPT->getParamTypes(), EPI)); |
8576 | } |
8577 | |
8578 | return false; |
8579 | } |
8580 | |
8581 | void Sema::DeclareImplicitEqualityComparison(CXXRecordDecl *RD, |
8582 | FunctionDecl *Spaceship) { |
8583 | Sema::CodeSynthesisContext Ctx; |
8584 | Ctx.Kind = Sema::CodeSynthesisContext::DeclaringImplicitEqualityComparison; |
8585 | Ctx.PointOfInstantiation = Spaceship->getEndLoc(); |
8586 | Ctx.Entity = Spaceship; |
8587 | pushCodeSynthesisContext(Ctx); |
8588 | |
8589 | if (FunctionDecl *EqualEqual = SubstSpaceshipAsEqualEqual(RD, Spaceship)) |
8590 | EqualEqual->setImplicit(); |
8591 | |
8592 | popCodeSynthesisContext(); |
8593 | } |
8594 | |
8595 | void Sema::DefineDefaultedComparison(SourceLocation UseLoc, FunctionDecl *FD, |
8596 | DefaultedComparisonKind DCK) { |
8597 | assert(FD->isDefaulted() && !FD->isDeleted() &&((void)0) |
8598 | !FD->doesThisDeclarationHaveABody())((void)0); |
8599 | if (FD->willHaveBody() || FD->isInvalidDecl()) |
8600 | return; |
8601 | |
8602 | SynthesizedFunctionScope Scope(*this, FD); |
8603 | |
8604 | // Add a context note for diagnostics produced after this point. |
8605 | Scope.addContextNote(UseLoc); |
8606 | |
8607 | { |
8608 | // Build and set up the function body. |
8609 | CXXRecordDecl *RD = cast<CXXRecordDecl>(FD->getLexicalParent()); |
8610 | SourceLocation BodyLoc = |
8611 | FD->getEndLoc().isValid() ? FD->getEndLoc() : FD->getLocation(); |
8612 | StmtResult Body = |
8613 | DefaultedComparisonSynthesizer(*this, RD, FD, DCK, BodyLoc).build(); |
8614 | if (Body.isInvalid()) { |
8615 | FD->setInvalidDecl(); |
8616 | return; |
8617 | } |
8618 | FD->setBody(Body.get()); |
8619 | FD->markUsed(Context); |
8620 | } |
8621 | |
8622 | // The exception specification is needed because we are defining the |
8623 | // function. Note that this will reuse the body we just built. |
8624 | ResolveExceptionSpec(UseLoc, FD->getType()->castAs<FunctionProtoType>()); |
8625 | |
8626 | if (ASTMutationListener *L = getASTMutationListener()) |
8627 | L->CompletedImplicitDefinition(FD); |
8628 | } |
8629 | |
8630 | static Sema::ImplicitExceptionSpecification |
8631 | ComputeDefaultedComparisonExceptionSpec(Sema &S, SourceLocation Loc, |
8632 | FunctionDecl *FD, |
8633 | Sema::DefaultedComparisonKind DCK) { |
8634 | ComputingExceptionSpec CES(S, FD, Loc); |
8635 | Sema::ImplicitExceptionSpecification ExceptSpec(S); |
8636 | |
8637 | if (FD->isInvalidDecl()) |
8638 | return ExceptSpec; |
8639 | |
8640 | // The common case is that we just defined the comparison function. In that |
8641 | // case, just look at whether the body can throw. |
8642 | if (FD->hasBody()) { |
8643 | ExceptSpec.CalledStmt(FD->getBody()); |
8644 | } else { |
8645 | // Otherwise, build a body so we can check it. This should ideally only |
8646 | // happen when we're not actually marking the function referenced. (This is |
8647 | // only really important for efficiency: we don't want to build and throw |
8648 | // away bodies for comparison functions more than we strictly need to.) |
8649 | |
8650 | // Pretend to synthesize the function body in an unevaluated context. |
8651 | // Note that we can't actually just go ahead and define the function here: |
8652 | // we are not permitted to mark its callees as referenced. |
8653 | Sema::SynthesizedFunctionScope Scope(S, FD); |
8654 | EnterExpressionEvaluationContext Context( |
8655 | S, Sema::ExpressionEvaluationContext::Unevaluated); |
8656 | |
8657 | CXXRecordDecl *RD = cast<CXXRecordDecl>(FD->getLexicalParent()); |
8658 | SourceLocation BodyLoc = |
8659 | FD->getEndLoc().isValid() ? FD->getEndLoc() : FD->getLocation(); |
8660 | StmtResult Body = |
8661 | DefaultedComparisonSynthesizer(S, RD, FD, DCK, BodyLoc).build(); |
8662 | if (!Body.isInvalid()) |
8663 | ExceptSpec.CalledStmt(Body.get()); |
8664 | |
8665 | // FIXME: Can we hold onto this body and just transform it to potentially |
8666 | // evaluated when we're asked to define the function rather than rebuilding |
8667 | // it? Either that, or we should only build the bits of the body that we |
8668 | // need (the expressions, not the statements). |
8669 | } |
8670 | |
8671 | return ExceptSpec; |
8672 | } |
8673 | |
8674 | void Sema::CheckDelayedMemberExceptionSpecs() { |
8675 | decltype(DelayedOverridingExceptionSpecChecks) Overriding; |
8676 | decltype(DelayedEquivalentExceptionSpecChecks) Equivalent; |
8677 | |
8678 | std::swap(Overriding, DelayedOverridingExceptionSpecChecks); |
8679 | std::swap(Equivalent, DelayedEquivalentExceptionSpecChecks); |
8680 | |
8681 | // Perform any deferred checking of exception specifications for virtual |
8682 | // destructors. |
8683 | for (auto &Check : Overriding) |
8684 | CheckOverridingFunctionExceptionSpec(Check.first, Check.second); |
8685 | |
8686 | // Perform any deferred checking of exception specifications for befriended |
8687 | // special members. |
8688 | for (auto &Check : Equivalent) |
8689 | CheckEquivalentExceptionSpec(Check.second, Check.first); |
8690 | } |
8691 | |
8692 | namespace { |
8693 | /// CRTP base class for visiting operations performed by a special member |
8694 | /// function (or inherited constructor). |
8695 | template<typename Derived> |
8696 | struct SpecialMemberVisitor { |
8697 | Sema &S; |
8698 | CXXMethodDecl *MD; |
8699 | Sema::CXXSpecialMember CSM; |
8700 | Sema::InheritedConstructorInfo *ICI; |
8701 | |
8702 | // Properties of the special member, computed for convenience. |
8703 | bool IsConstructor = false, IsAssignment = false, ConstArg = false; |
8704 | |
8705 | SpecialMemberVisitor(Sema &S, CXXMethodDecl *MD, Sema::CXXSpecialMember CSM, |
8706 | Sema::InheritedConstructorInfo *ICI) |
8707 | : S(S), MD(MD), CSM(CSM), ICI(ICI) { |
8708 | switch (CSM) { |
8709 | case Sema::CXXDefaultConstructor: |
8710 | case Sema::CXXCopyConstructor: |
8711 | case Sema::CXXMoveConstructor: |
8712 | IsConstructor = true; |
8713 | break; |
8714 | case Sema::CXXCopyAssignment: |
8715 | case Sema::CXXMoveAssignment: |
8716 | IsAssignment = true; |
8717 | break; |
8718 | case Sema::CXXDestructor: |
8719 | break; |
8720 | case Sema::CXXInvalid: |
8721 | llvm_unreachable("invalid special member kind")__builtin_unreachable(); |
8722 | } |
8723 | |
8724 | if (MD->getNumParams()) { |
8725 | if (const ReferenceType *RT = |
8726 | MD->getParamDecl(0)->getType()->getAs<ReferenceType>()) |
8727 | ConstArg = RT->getPointeeType().isConstQualified(); |
8728 | } |
8729 | } |
8730 | |
8731 | Derived &getDerived() { return static_cast<Derived&>(*this); } |
8732 | |
8733 | /// Is this a "move" special member? |
8734 | bool isMove() const { |
8735 | return CSM == Sema::CXXMoveConstructor || CSM == Sema::CXXMoveAssignment; |
8736 | } |
8737 | |
8738 | /// Look up the corresponding special member in the given class. |
8739 | Sema::SpecialMemberOverloadResult lookupIn(CXXRecordDecl *Class, |
8740 | unsigned Quals, bool IsMutable) { |
8741 | return lookupCallFromSpecialMember(S, Class, CSM, Quals, |
8742 | ConstArg && !IsMutable); |
8743 | } |
8744 | |
8745 | /// Look up the constructor for the specified base class to see if it's |
8746 | /// overridden due to this being an inherited constructor. |
8747 | Sema::SpecialMemberOverloadResult lookupInheritedCtor(CXXRecordDecl *Class) { |
8748 | if (!ICI) |
8749 | return {}; |
8750 | assert(CSM == Sema::CXXDefaultConstructor)((void)0); |
8751 | auto *BaseCtor = |
8752 | cast<CXXConstructorDecl>(MD)->getInheritedConstructor().getConstructor(); |
8753 | if (auto *MD = ICI->findConstructorForBase(Class, BaseCtor).first) |
8754 | return MD; |
8755 | return {}; |
8756 | } |
8757 | |
8758 | /// A base or member subobject. |
8759 | typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; |
8760 | |
8761 | /// Get the location to use for a subobject in diagnostics. |
8762 | static SourceLocation getSubobjectLoc(Subobject Subobj) { |
8763 | // FIXME: For an indirect virtual base, the direct base leading to |
8764 | // the indirect virtual base would be a more useful choice. |
8765 | if (auto *B = Subobj.dyn_cast<CXXBaseSpecifier*>()) |
8766 | return B->getBaseTypeLoc(); |
8767 | else |
8768 | return Subobj.get<FieldDecl*>()->getLocation(); |
8769 | } |
8770 | |
8771 | enum BasesToVisit { |
8772 | /// Visit all non-virtual (direct) bases. |
8773 | VisitNonVirtualBases, |
8774 | /// Visit all direct bases, virtual or not. |
8775 | VisitDirectBases, |
8776 | /// Visit all non-virtual bases, and all virtual bases if the class |
8777 | /// is not abstract. |
8778 | VisitPotentiallyConstructedBases, |
8779 | /// Visit all direct or virtual bases. |
8780 | VisitAllBases |
8781 | }; |
8782 | |
8783 | // Visit the bases and members of the class. |
8784 | bool visit(BasesToVisit Bases) { |
8785 | CXXRecordDecl *RD = MD->getParent(); |
8786 | |
8787 | if (Bases == VisitPotentiallyConstructedBases) |
8788 | Bases = RD->isAbstract() ? VisitNonVirtualBases : VisitAllBases; |
8789 | |
8790 | for (auto &B : RD->bases()) |
8791 | if ((Bases == VisitDirectBases || !B.isVirtual()) && |
8792 | getDerived().visitBase(&B)) |
8793 | return true; |
8794 | |
8795 | if (Bases == VisitAllBases) |
8796 | for (auto &B : RD->vbases()) |
8797 | if (getDerived().visitBase(&B)) |
8798 | return true; |
8799 | |
8800 | for (auto *F : RD->fields()) |
8801 | if (!F->isInvalidDecl() && !F->isUnnamedBitfield() && |
8802 | getDerived().visitField(F)) |
8803 | return true; |
8804 | |
8805 | return false; |
8806 | } |
8807 | }; |
8808 | } |
8809 | |
8810 | namespace { |
8811 | struct SpecialMemberDeletionInfo |
8812 | : SpecialMemberVisitor<SpecialMemberDeletionInfo> { |
8813 | bool Diagnose; |
8814 | |
8815 | SourceLocation Loc; |
8816 | |
8817 | bool AllFieldsAreConst; |
8818 | |
8819 | SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, |
8820 | Sema::CXXSpecialMember CSM, |
8821 | Sema::InheritedConstructorInfo *ICI, bool Diagnose) |
8822 | : SpecialMemberVisitor(S, MD, CSM, ICI), Diagnose(Diagnose), |
8823 | Loc(MD->getLocation()), AllFieldsAreConst(true) {} |
8824 | |
8825 | bool inUnion() const { return MD->getParent()->isUnion(); } |
8826 | |
8827 | Sema::CXXSpecialMember getEffectiveCSM() { |
8828 | return ICI ? Sema::CXXInvalid : CSM; |
8829 | } |
8830 | |
8831 | bool shouldDeleteForVariantObjCPtrMember(FieldDecl *FD, QualType FieldType); |
8832 | |
8833 | bool visitBase(CXXBaseSpecifier *Base) { return shouldDeleteForBase(Base); } |
8834 | bool visitField(FieldDecl *Field) { return shouldDeleteForField(Field); } |
8835 | |
8836 | bool shouldDeleteForBase(CXXBaseSpecifier *Base); |
8837 | bool shouldDeleteForField(FieldDecl *FD); |
8838 | bool shouldDeleteForAllConstMembers(); |
8839 | |
8840 | bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, |
8841 | unsigned Quals); |
8842 | bool shouldDeleteForSubobjectCall(Subobject Subobj, |
8843 | Sema::SpecialMemberOverloadResult SMOR, |
8844 | bool IsDtorCallInCtor); |
8845 | |
8846 | bool isAccessible(Subobject Subobj, CXXMethodDecl *D); |
8847 | }; |
8848 | } |
8849 | |
8850 | /// Is the given special member inaccessible when used on the given |
8851 | /// sub-object. |
8852 | bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, |
8853 | CXXMethodDecl *target) { |
8854 | /// If we're operating on a base class, the object type is the |
8855 | /// type of this special member. |
8856 | QualType objectTy; |
8857 | AccessSpecifier access = target->getAccess(); |
8858 | if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { |
8859 | objectTy = S.Context.getTypeDeclType(MD->getParent()); |
8860 | access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); |
8861 | |
8862 | // If we're operating on a field, the object type is the type of the field. |
8863 | } else { |
8864 | objectTy = S.Context.getTypeDeclType(target->getParent()); |
8865 | } |
8866 | |
8867 | return S.isMemberAccessibleForDeletion( |
8868 | target->getParent(), DeclAccessPair::make(target, access), objectTy); |
8869 | } |
8870 | |
8871 | /// Check whether we should delete a special member due to the implicit |
8872 | /// definition containing a call to a special member of a subobject. |
8873 | bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( |
8874 | Subobject Subobj, Sema::SpecialMemberOverloadResult SMOR, |
8875 | bool IsDtorCallInCtor) { |
8876 | CXXMethodDecl *Decl = SMOR.getMethod(); |
8877 | FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); |
8878 | |
8879 | int DiagKind = -1; |
8880 | |
8881 | if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) |
8882 | DiagKind = !Decl ? 0 : 1; |
8883 | else if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) |
8884 | DiagKind = 2; |
8885 | else if (!isAccessible(Subobj, Decl)) |
8886 | DiagKind = 3; |
8887 | else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && |
8888 | !Decl->isTrivial()) { |
8889 | // A member of a union must have a trivial corresponding special member. |
8890 | // As a weird special case, a destructor call from a union's constructor |
8891 | // must be accessible and non-deleted, but need not be trivial. Such a |
8892 | // destructor is never actually called, but is semantically checked as |
8893 | // if it were. |
8894 | DiagKind = 4; |
8895 | } |
8896 | |
8897 | if (DiagKind == -1) |
8898 | return false; |
8899 | |
8900 | if (Diagnose) { |
8901 | if (Field) { |
8902 | S.Diag(Field->getLocation(), |
8903 | diag::note_deleted_special_member_class_subobject) |
8904 | << getEffectiveCSM() << MD->getParent() << /*IsField*/true |
8905 | << Field << DiagKind << IsDtorCallInCtor << /*IsObjCPtr*/false; |
8906 | } else { |
8907 | CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); |
8908 | S.Diag(Base->getBeginLoc(), |
8909 | diag::note_deleted_special_member_class_subobject) |
8910 | << getEffectiveCSM() << MD->getParent() << /*IsField*/ false |
8911 | << Base->getType() << DiagKind << IsDtorCallInCtor |
8912 | << /*IsObjCPtr*/false; |
8913 | } |
8914 | |
8915 | if (DiagKind == 1) |
8916 | S.NoteDeletedFunction(Decl); |
8917 | // FIXME: Explain inaccessibility if DiagKind == 3. |
8918 | } |
8919 | |
8920 | return true; |
8921 | } |
8922 | |
8923 | /// Check whether we should delete a special member function due to having a |
8924 | /// direct or virtual base class or non-static data member of class type M. |
8925 | bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( |
8926 | CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { |
8927 | FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); |
8928 | bool IsMutable = Field && Field->isMutable(); |
8929 | |
8930 | // C++11 [class.ctor]p5: |
8931 | // -- any direct or virtual base class, or non-static data member with no |
8932 | // brace-or-equal-initializer, has class type M (or array thereof) and |
8933 | // either M has no default constructor or overload resolution as applied |
8934 | // to M's default constructor results in an ambiguity or in a function |
8935 | // that is deleted or inaccessible |
8936 | // C++11 [class.copy]p11, C++11 [class.copy]p23: |
8937 | // -- a direct or virtual base class B that cannot be copied/moved because |
8938 | // overload resolution, as applied to B's corresponding special member, |
8939 | // results in an ambiguity or a function that is deleted or inaccessible |
8940 | // from the defaulted special member |
8941 | // C++11 [class.dtor]p5: |
8942 | // -- any direct or virtual base class [...] has a type with a destructor |
8943 | // that is deleted or inaccessible |
8944 | if (!(CSM == Sema::CXXDefaultConstructor && |
8945 | Field && Field->hasInClassInitializer()) && |
8946 | shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals, IsMutable), |
8947 | false)) |
8948 | return true; |
8949 | |
8950 | // C++11 [class.ctor]p5, C++11 [class.copy]p11: |
8951 | // -- any direct or virtual base class or non-static data member has a |
8952 | // type with a destructor that is deleted or inaccessible |
8953 | if (IsConstructor) { |
8954 | Sema::SpecialMemberOverloadResult SMOR = |
8955 | S.LookupSpecialMember(Class, Sema::CXXDestructor, |
8956 | false, false, false, false, false); |
8957 | if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) |
8958 | return true; |
8959 | } |
8960 | |
8961 | return false; |
8962 | } |
8963 | |
8964 | bool SpecialMemberDeletionInfo::shouldDeleteForVariantObjCPtrMember( |
8965 | FieldDecl *FD, QualType FieldType) { |
8966 | // The defaulted special functions are defined as deleted if this is a variant |
8967 | // member with a non-trivial ownership type, e.g., ObjC __strong or __weak |
8968 | // type under ARC. |
8969 | if (!FieldType.hasNonTrivialObjCLifetime()) |
8970 | return false; |
8971 | |
8972 | // Don't make the defaulted default constructor defined as deleted if the |
8973 | // member has an in-class initializer. |
8974 | if (CSM == Sema::CXXDefaultConstructor && FD->hasInClassInitializer()) |
8975 | return false; |
8976 | |
8977 | if (Diagnose) { |
8978 | auto *ParentClass = cast<CXXRecordDecl>(FD->getParent()); |
8979 | S.Diag(FD->getLocation(), |
8980 | diag::note_deleted_special_member_class_subobject) |
8981 | << getEffectiveCSM() << ParentClass << /*IsField*/true |
8982 | << FD << 4 << /*IsDtorCallInCtor*/false << /*IsObjCPtr*/true; |
8983 | } |
8984 | |
8985 | return true; |
8986 | } |
8987 | |
8988 | /// Check whether we should delete a special member function due to the class |
8989 | /// having a particular direct or virtual base class. |
8990 | bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { |
8991 | CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); |
8992 | // If program is correct, BaseClass cannot be null, but if it is, the error |
8993 | // must be reported elsewhere. |
8994 | if (!BaseClass) |
8995 | return false; |
8996 | // If we have an inheriting constructor, check whether we're calling an |
8997 | // inherited constructor instead of a default constructor. |
8998 | Sema::SpecialMemberOverloadResult SMOR = lookupInheritedCtor(BaseClass); |
8999 | if (auto *BaseCtor = SMOR.getMethod()) { |
9000 | // Note that we do not check access along this path; other than that, |
9001 | // this is the same as shouldDeleteForSubobjectCall(Base, BaseCtor, false); |
9002 | // FIXME: Check that the base has a usable destructor! Sink this into |
9003 | // shouldDeleteForClassSubobject. |
9004 | if (BaseCtor->isDeleted() && Diagnose) { |
9005 | S.Diag(Base->getBeginLoc(), |
9006 | diag::note_deleted_special_member_class_subobject) |
9007 | << getEffectiveCSM() << MD->getParent() << /*IsField*/ false |
9008 | << Base->getType() << /*Deleted*/ 1 << /*IsDtorCallInCtor*/ false |
9009 | << /*IsObjCPtr*/false; |
9010 | S.NoteDeletedFunction(BaseCtor); |
9011 | } |
9012 | return BaseCtor->isDeleted(); |
9013 | } |
9014 | return shouldDeleteForClassSubobject(BaseClass, Base, 0); |
9015 | } |
9016 | |
9017 | /// Check whether we should delete a special member function due to the class |
9018 | /// having a particular non-static data member. |
9019 | bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { |
9020 | QualType FieldType = S.Context.getBaseElementType(FD->getType()); |
9021 | CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); |
9022 | |
9023 | if (inUnion() && shouldDeleteForVariantObjCPtrMember(FD, FieldType)) |
9024 | return true; |
9025 | |
9026 | if (CSM == Sema::CXXDefaultConstructor) { |
9027 | // For a default constructor, all references must be initialized in-class |
9028 | // and, if a union, it must have a non-const member. |
9029 | if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { |
9030 | if (Diagnose) |
9031 | S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) |
9032 | << !!ICI << MD->getParent() << FD << FieldType << /*Reference*/0; |
9033 | return true; |
9034 | } |
9035 | // C++11 [class.ctor]p5: any non-variant non-static data member of |
9036 | // const-qualified type (or array thereof) with no |
9037 | // brace-or-equal-initializer does not have a user-provided default |
9038 | // constructor. |
9039 | if (!inUnion() && FieldType.isConstQualified() && |
9040 | !FD->hasInClassInitializer() && |
9041 | (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { |
9042 | if (Diagnose) |
9043 | S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) |
9044 | << !!ICI << MD->getParent() << FD << FD->getType() << /*Const*/1; |
9045 | return true; |
9046 | } |
9047 | |
9048 | if (inUnion() && !FieldType.isConstQualified()) |
9049 | AllFieldsAreConst = false; |
9050 | } else if (CSM == Sema::CXXCopyConstructor) { |
9051 | // For a copy constructor, data members must not be of rvalue reference |
9052 | // type. |
9053 | if (FieldType->isRValueReferenceType()) { |
9054 | if (Diagnose) |
9055 | S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) |
9056 | << MD->getParent() << FD << FieldType; |
9057 | return true; |
9058 | } |
9059 | } else if (IsAssignment) { |
9060 | // For an assignment operator, data members must not be of reference type. |
9061 | if (FieldType->isReferenceType()) { |
9062 | if (Diagnose) |
9063 | S.Diag(FD->getLocation(), diag::note_deleted_assign_field) |
9064 | << isMove() << MD->getParent() << FD << FieldType << /*Reference*/0; |
9065 | return true; |
9066 | } |
9067 | if (!FieldRecord && FieldType.isConstQualified()) { |
9068 | // C++11 [class.copy]p23: |
9069 | // -- a non-static data member of const non-class type (or array thereof) |
9070 | if (Diagnose) |
9071 | S.Diag(FD->getLocation(), diag::note_deleted_assign_field) |
9072 | << isMove() << MD->getParent() << FD << FD->getType() << /*Const*/1; |
9073 | return true; |
9074 | } |
9075 | } |
9076 | |
9077 | if (FieldRecord) { |
9078 | // Some additional restrictions exist on the variant members. |
9079 | if (!inUnion() && FieldRecord->isUnion() && |
9080 | FieldRecord->isAnonymousStructOrUnion()) { |
9081 | bool AllVariantFieldsAreConst = true; |
9082 | |
9083 | // FIXME: Handle anonymous unions declared within anonymous unions. |
9084 | for (auto *UI : FieldRecord->fields()) { |
9085 | QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); |
9086 | |
9087 | if (shouldDeleteForVariantObjCPtrMember(&*UI, UnionFieldType)) |
9088 | return true; |
9089 | |
9090 | if (!UnionFieldType.isConstQualified()) |
9091 | AllVariantFieldsAreConst = false; |
9092 | |
9093 | CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); |
9094 | if (UnionFieldRecord && |
9095 | shouldDeleteForClassSubobject(UnionFieldRecord, UI, |
9096 | UnionFieldType.getCVRQualifiers())) |
9097 | return true; |
9098 | } |
9099 | |
9100 | // At least one member in each anonymous union must be non-const |
9101 | if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && |
9102 | !FieldRecord->field_empty()) { |
9103 | if (Diagnose) |
9104 | S.Diag(FieldRecord->getLocation(), |
9105 | diag::note_deleted_default_ctor_all_const) |
9106 | << !!ICI << MD->getParent() << /*anonymous union*/1; |
9107 | return true; |
9108 | } |
9109 | |
9110 | // Don't check the implicit member of the anonymous union type. |
9111 | // This is technically non-conformant, but sanity demands it. |
9112 | return false; |
9113 | } |
9114 | |
9115 | if (shouldDeleteForClassSubobject(FieldRecord, FD, |
9116 | FieldType.getCVRQualifiers())) |
9117 | return true; |
9118 | } |
9119 | |
9120 | return false; |
9121 | } |
9122 | |
9123 | /// C++11 [class.ctor] p5: |
9124 | /// A defaulted default constructor for a class X is defined as deleted if |
9125 | /// X is a union and all of its variant members are of const-qualified type. |
9126 | bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { |
9127 | // This is a silly definition, because it gives an empty union a deleted |
9128 | // default constructor. Don't do that. |
9129 | if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst) { |
9130 | bool AnyFields = false; |
9131 | for (auto *F : MD->getParent()->fields()) |
9132 | if ((AnyFields = !F->isUnnamedBitfield())) |
9133 | break; |
9134 | if (!AnyFields) |
9135 | return false; |
9136 | if (Diagnose) |
9137 | S.Diag(MD->getParent()->getLocation(), |
9138 | diag::note_deleted_default_ctor_all_const) |
9139 | << !!ICI << MD->getParent() << /*not anonymous union*/0; |
9140 | return true; |
9141 | } |
9142 | return false; |
9143 | } |
9144 | |
9145 | /// Determine whether a defaulted special member function should be defined as |
9146 | /// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, |
9147 | /// C++11 [class.copy]p23, and C++11 [class.dtor]p5. |
9148 | bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, |
9149 | InheritedConstructorInfo *ICI, |
9150 | bool Diagnose) { |
9151 | if (MD->isInvalidDecl()) |
9152 | return false; |
9153 | CXXRecordDecl *RD = MD->getParent(); |
9154 | assert(!RD->isDependentType() && "do deletion after instantiation")((void)0); |
9155 | if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl()) |
9156 | return false; |
9157 | |
9158 | // C++11 [expr.lambda.prim]p19: |
9159 | // The closure type associated with a lambda-expression has a |
9160 | // deleted (8.4.3) default constructor and a deleted copy |
9161 | // assignment operator. |
9162 | // C++2a adds back these operators if the lambda has no lambda-capture. |
9163 | if (RD->isLambda() && !RD->lambdaIsDefaultConstructibleAndAssignable() && |
9164 | (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { |
9165 | if (Diagnose) |
9166 | Diag(RD->getLocation(), diag::note_lambda_decl); |
9167 | return true; |
9168 | } |
9169 | |
9170 | // For an anonymous struct or union, the copy and assignment special members |
9171 | // will never be used, so skip the check. For an anonymous union declared at |
9172 | // namespace scope, the constructor and destructor are used. |
9173 | if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && |
9174 | RD->isAnonymousStructOrUnion()) |
9175 | return false; |
9176 | |
9177 | // C++11 [class.copy]p7, p18: |
9178 | // If the class definition declares a move constructor or move assignment |
9179 | // operator, an implicitly declared copy constructor or copy assignment |
9180 | // operator is defined as deleted. |
9181 | if (MD->isImplicit() && |
9182 | (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { |
9183 | CXXMethodDecl *UserDeclaredMove = nullptr; |
9184 | |
9185 | // In Microsoft mode up to MSVC 2013, a user-declared move only causes the |
9186 | // deletion of the corresponding copy operation, not both copy operations. |
9187 | // MSVC 2015 has adopted the standards conforming behavior. |
9188 | bool DeletesOnlyMatchingCopy = |
9189 | getLangOpts().MSVCCompat && |
9190 | !getLangOpts().isCompatibleWithMSVC(LangOptions::MSVC2015); |
9191 | |
9192 | if (RD->hasUserDeclaredMoveConstructor() && |
9193 | (!DeletesOnlyMatchingCopy || CSM == CXXCopyConstructor)) { |
9194 | if (!Diagnose) return true; |
9195 | |
9196 | // Find any user-declared move constructor. |
9197 | for (auto *I : RD->ctors()) { |
9198 | if (I->isMoveConstructor()) { |
9199 | UserDeclaredMove = I; |
9200 | break; |
9201 | } |
9202 | } |
9203 | assert(UserDeclaredMove)((void)0); |
9204 | } else if (RD->hasUserDeclaredMoveAssignment() && |
9205 | (!DeletesOnlyMatchingCopy || CSM == CXXCopyAssignment)) { |
9206 | if (!Diagnose) return true; |
9207 | |
9208 | // Find any user-declared move assignment operator. |
9209 | for (auto *I : RD->methods()) { |
9210 | if (I->isMoveAssignmentOperator()) { |
9211 | UserDeclaredMove = I; |
9212 | break; |
9213 | } |
9214 | } |
9215 | assert(UserDeclaredMove)((void)0); |
9216 | } |
9217 | |
9218 | if (UserDeclaredMove) { |
9219 | Diag(UserDeclaredMove->getLocation(), |
9220 | diag::note_deleted_copy_user_declared_move) |
9221 | << (CSM == CXXCopyAssignment) << RD |
9222 | << UserDeclaredMove->isMoveAssignmentOperator(); |
9223 | return true; |
9224 | } |
9225 | } |
9226 | |
9227 | // Do access control from the special member function |
9228 | ContextRAII MethodContext(*this, MD); |
9229 | |
9230 | // C++11 [class.dtor]p5: |
9231 | // -- for a virtual destructor, lookup of the non-array deallocation function |
9232 | // results in an ambiguity or in a function that is deleted or inaccessible |
9233 | if (CSM == CXXDestructor && MD->isVirtual()) { |
9234 | FunctionDecl *OperatorDelete = nullptr; |
9235 | DeclarationName Name = |
9236 | Context.DeclarationNames.getCXXOperatorName(OO_Delete); |
9237 | if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, |
9238 | OperatorDelete, /*Diagnose*/false)) { |
9239 | if (Diagnose) |
9240 | Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); |
9241 | return true; |
9242 | } |
9243 | } |
9244 | |
9245 | SpecialMemberDeletionInfo SMI(*this, MD, CSM, ICI, Diagnose); |
9246 | |
9247 | // Per DR1611, do not consider virtual bases of constructors of abstract |
9248 | // classes, since we are not going to construct them. |
9249 | // Per DR1658, do not consider virtual bases of destructors of abstract |
9250 | // classes either. |
9251 | // Per DR2180, for assignment operators we only assign (and thus only |
9252 | // consider) direct bases. |
9253 | if (SMI.visit(SMI.IsAssignment ? SMI.VisitDirectBases |
9254 | : SMI.VisitPotentiallyConstructedBases)) |
9255 | return true; |
9256 | |
9257 | if (SMI.shouldDeleteForAllConstMembers()) |
9258 | return true; |
9259 | |
9260 | if (getLangOpts().CUDA) { |
9261 | // We should delete the special member in CUDA mode if target inference |
9262 | // failed. |
9263 | // For inherited constructors (non-null ICI), CSM may be passed so that MD |
9264 | // is treated as certain special member, which may not reflect what special |
9265 | // member MD really is. However inferCUDATargetForImplicitSpecialMember |
9266 | // expects CSM to match MD, therefore recalculate CSM. |
9267 | assert(ICI || CSM == getSpecialMember(MD))((void)0); |
9268 | auto RealCSM = CSM; |
9269 | if (ICI) |
9270 | RealCSM = getSpecialMember(MD); |
9271 | |
9272 | return inferCUDATargetForImplicitSpecialMember(RD, RealCSM, MD, |
9273 | SMI.ConstArg, Diagnose); |
9274 | } |
9275 | |
9276 | return false; |
9277 | } |
9278 | |
9279 | void Sema::DiagnoseDeletedDefaultedFunction(FunctionDecl *FD) { |
9280 | DefaultedFunctionKind DFK = getDefaultedFunctionKind(FD); |
9281 | assert(DFK && "not a defaultable function")((void)0); |
9282 | assert(FD->isDefaulted() && FD->isDeleted() && "not defaulted and deleted")((void)0); |
9283 | |
9284 | if (DFK.isSpecialMember()) { |
9285 | ShouldDeleteSpecialMember(cast<CXXMethodDecl>(FD), DFK.asSpecialMember(), |
9286 | nullptr, /*Diagnose=*/true); |
9287 | } else { |
9288 | DefaultedComparisonAnalyzer( |
9289 | *this, cast<CXXRecordDecl>(FD->getLexicalDeclContext()), FD, |
9290 | DFK.asComparison(), DefaultedComparisonAnalyzer::ExplainDeleted) |
9291 | .visit(); |
9292 | } |
9293 | } |
9294 | |
9295 | /// Perform lookup for a special member of the specified kind, and determine |
9296 | /// whether it is trivial. If the triviality can be determined without the |
9297 | /// lookup, skip it. This is intended for use when determining whether a |
9298 | /// special member of a containing object is trivial, and thus does not ever |
9299 | /// perform overload resolution for default constructors. |
9300 | /// |
9301 | /// If \p Selected is not \c NULL, \c *Selected will be filled in with the |
9302 | /// member that was most likely to be intended to be trivial, if any. |
9303 | /// |
9304 | /// If \p ForCall is true, look at CXXRecord::HasTrivialSpecialMembersForCall to |
9305 | /// determine whether the special member is trivial. |
9306 | static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD, |
9307 | Sema::CXXSpecialMember CSM, unsigned Quals, |
9308 | bool ConstRHS, |
9309 | Sema::TrivialABIHandling TAH, |
9310 | CXXMethodDecl **Selected) { |
9311 | if (Selected) |
9312 | *Selected = nullptr; |
9313 | |
9314 | switch (CSM) { |
9315 | case Sema::CXXInvalid: |
9316 | llvm_unreachable("not a special member")__builtin_unreachable(); |
9317 | |
9318 | case Sema::CXXDefaultConstructor: |
9319 | // C++11 [class.ctor]p5: |
9320 | // A default constructor is trivial if: |
9321 | // - all the [direct subobjects] have trivial default constructors |
9322 | // |
9323 | // Note, no overload resolution is performed in this case. |
9324 | if (RD->hasTrivialDefaultConstructor()) |
9325 | return true; |
9326 | |
9327 | if (Selected) { |
9328 | // If there's a default constructor which could have been trivial, dig it |
9329 | // out. Otherwise, if there's any user-provided default constructor, point |
9330 | // to that as an example of why there's not a trivial one. |
9331 | CXXConstructorDecl *DefCtor = nullptr; |
9332 | if (RD->needsImplicitDefaultConstructor()) |
9333 | S.DeclareImplicitDefaultConstructor(RD); |
9334 | for (auto *CI : RD->ctors()) { |
9335 | if (!CI->isDefaultConstructor()) |
9336 | continue; |
9337 | DefCtor = CI; |
9338 | if (!DefCtor->isUserProvided()) |
9339 | break; |
9340 | } |
9341 | |
9342 | *Selected = DefCtor; |
9343 | } |
9344 | |
9345 | return false; |
9346 | |
9347 | case Sema::CXXDestructor: |
9348 | // C++11 [class.dtor]p5: |
9349 | // A destructor is trivial if: |
9350 | // - all the direct [subobjects] have trivial destructors |
9351 | if (RD->hasTrivialDestructor() || |
9352 | (TAH == Sema::TAH_ConsiderTrivialABI && |
9353 | RD->hasTrivialDestructorForCall())) |
9354 | return true; |
9355 | |
9356 | if (Selected) { |
9357 | if (RD->needsImplicitDestructor()) |
9358 | S.DeclareImplicitDestructor(RD); |
9359 | *Selected = RD->getDestructor(); |
9360 | } |
9361 | |
9362 | return false; |
9363 | |
9364 | case Sema::CXXCopyConstructor: |
9365 | // C++11 [class.copy]p12: |
9366 | // A copy constructor is trivial if: |
9367 | // - the constructor selected to copy each direct [subobject] is trivial |
9368 | if (RD->hasTrivialCopyConstructor() || |
9369 | (TAH == Sema::TAH_ConsiderTrivialABI && |
9370 | RD->hasTrivialCopyConstructorForCall())) { |
9371 | if (Quals == Qualifiers::Const) |
9372 | // We must either select the trivial copy constructor or reach an |
9373 | // ambiguity; no need to actually perform overload resolution. |
9374 | return true; |
9375 | } else if (!Selected) { |
9376 | return false; |
9377 | } |
9378 | // In C++98, we are not supposed to perform overload resolution here, but we |
9379 | // treat that as a language defect, as suggested on cxx-abi-dev, to treat |
9380 | // cases like B as having a non-trivial copy constructor: |
9381 | // struct A { template<typename T> A(T&); }; |
9382 | // struct B { mutable A a; }; |
9383 | goto NeedOverloadResolution; |
9384 | |
9385 | case Sema::CXXCopyAssignment: |
9386 | // C++11 [class.copy]p25: |
9387 | // A copy assignment operator is trivial if: |
9388 | // - the assignment operator selected to copy each direct [subobject] is |
9389 | // trivial |
9390 | if (RD->hasTrivialCopyAssignment()) { |
9391 | if (Quals == Qualifiers::Const) |
9392 | return true; |
9393 | } else if (!Selected) { |
9394 | return false; |
9395 | } |
9396 | // In C++98, we are not supposed to perform overload resolution here, but we |
9397 | // treat that as a language defect. |
9398 | goto NeedOverloadResolution; |
9399 | |
9400 | case Sema::CXXMoveConstructor: |
9401 | case Sema::CXXMoveAssignment: |
9402 | NeedOverloadResolution: |
9403 | Sema::SpecialMemberOverloadResult SMOR = |
9404 | lookupCallFromSpecialMember(S, RD, CSM, Quals, ConstRHS); |
9405 | |
9406 | // The standard doesn't describe how to behave if the lookup is ambiguous. |
9407 | // We treat it as not making the member non-trivial, just like the standard |
9408 | // mandates for the default constructor. This should rarely matter, because |
9409 | // the member will also be deleted. |
9410 | if (SMOR.getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) |
9411 | return true; |
9412 | |
9413 | if (!SMOR.getMethod()) { |
9414 | assert(SMOR.getKind() ==((void)0) |
9415 | Sema::SpecialMemberOverloadResult::NoMemberOrDeleted)((void)0); |
9416 | return false; |
9417 | } |
9418 | |
9419 | // We deliberately don't check if we found a deleted special member. We're |
9420 | // not supposed to! |
9421 | if (Selected) |
9422 | *Selected = SMOR.getMethod(); |
9423 | |
9424 | if (TAH == Sema::TAH_ConsiderTrivialABI && |
9425 | (CSM == Sema::CXXCopyConstructor || CSM == Sema::CXXMoveConstructor)) |
9426 | return SMOR.getMethod()->isTrivialForCall(); |
9427 | return SMOR.getMethod()->isTrivial(); |
9428 | } |
9429 | |
9430 | llvm_unreachable("unknown special method kind")__builtin_unreachable(); |
9431 | } |
9432 | |
9433 | static CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) { |
9434 | for (auto *CI : RD->ctors()) |
9435 | if (!CI->isImplicit()) |
9436 | return CI; |
9437 | |
9438 | // Look for constructor templates. |
9439 | typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter; |
9440 | for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) { |
9441 | if (CXXConstructorDecl *CD = |
9442 | dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl())) |
9443 | return CD; |
9444 | } |
9445 | |
9446 | return nullptr; |
9447 | } |
9448 | |
9449 | /// The kind of subobject we are checking for triviality. The values of this |
9450 | /// enumeration are used in diagnostics. |
9451 | enum TrivialSubobjectKind { |
9452 | /// The subobject is a base class. |
9453 | TSK_BaseClass, |
9454 | /// The subobject is a non-static data member. |
9455 | TSK_Field, |
9456 | /// The object is actually the complete object. |
9457 | TSK_CompleteObject |
9458 | }; |
9459 | |
9460 | /// Check whether the special member selected for a given type would be trivial. |
9461 | static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc, |
9462 | QualType SubType, bool ConstRHS, |
9463 | Sema::CXXSpecialMember CSM, |
9464 | TrivialSubobjectKind Kind, |
9465 | Sema::TrivialABIHandling TAH, bool Diagnose) { |
9466 | CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl(); |
9467 | if (!SubRD) |
9468 | return true; |
9469 | |
9470 | CXXMethodDecl *Selected; |
9471 | if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(), |
9472 | ConstRHS, TAH, Diagnose ? &Selected : nullptr)) |
9473 | return true; |
9474 | |
9475 | if (Diagnose) { |
9476 | if (ConstRHS) |
9477 | SubType.addConst(); |
9478 | |
9479 | if (!Selected && CSM == Sema::CXXDefaultConstructor) { |
9480 | S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor) |
9481 | << Kind << SubType.getUnqualifiedType(); |
9482 | if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD)) |
9483 | S.Diag(CD->getLocation(), diag::note_user_declared_ctor); |
9484 | } else if (!Selected) |
9485 | S.Diag(SubobjLoc, diag::note_nontrivial_no_copy) |
9486 | << Kind << SubType.getUnqualifiedType() << CSM << SubType; |
9487 | else if (Selected->isUserProvided()) { |
9488 | if (Kind == TSK_CompleteObject) |
9489 | S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided) |
9490 | << Kind << SubType.getUnqualifiedType() << CSM; |
9491 | else { |
9492 | S.Diag(SubobjLoc, diag::note_nontrivial_user_provided) |
9493 | << Kind << SubType.getUnqualifiedType() << CSM; |
9494 | S.Diag(Selected->getLocation(), diag::note_declared_at); |
9495 | } |
9496 | } else { |
9497 | if (Kind != TSK_CompleteObject) |
9498 | S.Diag(SubobjLoc, diag::note_nontrivial_subobject) |
9499 | << Kind << SubType.getUnqualifiedType() << CSM; |
9500 | |
9501 | // Explain why the defaulted or deleted special member isn't trivial. |
9502 | S.SpecialMemberIsTrivial(Selected, CSM, Sema::TAH_IgnoreTrivialABI, |
9503 | Diagnose); |
9504 | } |
9505 | } |
9506 | |
9507 | return false; |
9508 | } |
9509 | |
9510 | /// Check whether the members of a class type allow a special member to be |
9511 | /// trivial. |
9512 | static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD, |
9513 | Sema::CXXSpecialMember CSM, |
9514 | bool ConstArg, |
9515 | Sema::TrivialABIHandling TAH, |
9516 | bool Diagnose) { |
9517 | for (const auto *FI : RD->fields()) { |
9518 | if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) |
9519 | continue; |
9520 | |
9521 | QualType FieldType = S.Context.getBaseElementType(FI->getType()); |
9522 | |
9523 | // Pretend anonymous struct or union members are members of this class. |
9524 | if (FI->isAnonymousStructOrUnion()) { |
9525 | if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(), |
9526 | CSM, ConstArg, TAH, Diagnose)) |
9527 | return false; |
9528 | continue; |
9529 | } |
9530 | |
9531 | // C++11 [class.ctor]p5: |
9532 | // A default constructor is trivial if [...] |
9533 | // -- no non-static data member of its class has a |
9534 | // brace-or-equal-initializer |
9535 | if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) { |
9536 | if (Diagnose) |
9537 | S.Diag(FI->getLocation(), diag::note_nontrivial_default_member_init) |
9538 | << FI; |
9539 | return false; |
9540 | } |
9541 | |
9542 | // Objective C ARC 4.3.5: |
9543 | // [...] nontrivally ownership-qualified types are [...] not trivially |
9544 | // default constructible, copy constructible, move constructible, copy |
9545 | // assignable, move assignable, or destructible [...] |
9546 | if (FieldType.hasNonTrivialObjCLifetime()) { |
9547 | if (Diagnose) |
9548 | S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership) |
9549 | << RD << FieldType.getObjCLifetime(); |
9550 | return false; |
9551 | } |
9552 | |
9553 | bool ConstRHS = ConstArg && !FI->isMutable(); |
9554 | if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, ConstRHS, |
9555 | CSM, TSK_Field, TAH, Diagnose)) |
9556 | return false; |
9557 | } |
9558 | |
9559 | return true; |
9560 | } |
9561 | |
9562 | /// Diagnose why the specified class does not have a trivial special member of |
9563 | /// the given kind. |
9564 | void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) { |
9565 | QualType Ty = Context.getRecordType(RD); |
9566 | |
9567 | bool ConstArg = (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment); |
9568 | checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, ConstArg, CSM, |
9569 | TSK_CompleteObject, TAH_IgnoreTrivialABI, |
9570 | /*Diagnose*/true); |
9571 | } |
9572 | |
9573 | /// Determine whether a defaulted or deleted special member function is trivial, |
9574 | /// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12, |
9575 | /// C++11 [class.copy]p25, and C++11 [class.dtor]p5. |
9576 | bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM, |
9577 | TrivialABIHandling TAH, bool Diagnose) { |
9578 | assert(!MD->isUserProvided() && CSM != CXXInvalid && "not special enough")((void)0); |
9579 | |
9580 | CXXRecordDecl *RD = MD->getParent(); |
9581 | |
9582 | bool ConstArg = false; |
9583 | |
9584 | // C++11 [class.copy]p12, p25: [DR1593] |
9585 | // A [special member] is trivial if [...] its parameter-type-list is |
9586 | // equivalent to the parameter-type-list of an implicit declaration [...] |
9587 | switch (CSM) { |
9588 | case CXXDefaultConstructor: |
9589 | case CXXDestructor: |
9590 | // Trivial default constructors and destructors cannot have parameters. |
9591 | break; |
9592 | |
9593 | case CXXCopyConstructor: |
9594 | case CXXCopyAssignment: { |
9595 | // Trivial copy operations always have const, non-volatile parameter types. |
9596 | ConstArg = true; |
9597 | const ParmVarDecl *Param0 = MD->getParamDecl(0); |
9598 | const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>(); |
9599 | if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) { |
9600 | if (Diagnose) |
9601 | Diag(Param0->getLocation(), diag::note_nontrivial_param_type) |
9602 | << Param0->getSourceRange() << Param0->getType() |
9603 | << Context.getLValueReferenceType( |
9604 | Context.getRecordType(RD).withConst()); |
9605 | return false; |
9606 | } |
9607 | break; |
9608 | } |
9609 | |
9610 | case CXXMoveConstructor: |
9611 | case CXXMoveAssignment: { |
9612 | // Trivial move operations always have non-cv-qualified parameters. |
9613 | const ParmVarDecl *Param0 = MD->getParamDecl(0); |
9614 | const RValueReferenceType *RT = |
9615 | Param0->getType()->getAs<RValueReferenceType>(); |
9616 | if (!RT || RT->getPointeeType().getCVRQualifiers()) { |
9617 | if (Diagnose) |
9618 | Diag(Param0->getLocation(), diag::note_nontrivial_param_type) |
9619 | << Param0->getSourceRange() << Param0->getType() |
9620 | << Context.getRValueReferenceType(Context.getRecordType(RD)); |
9621 | return false; |
9622 | } |
9623 | break; |
9624 | } |
9625 | |
9626 | case CXXInvalid: |
9627 | llvm_unreachable("not a special member")__builtin_unreachable(); |
9628 | } |
9629 | |
9630 | if (MD->getMinRequiredArguments() < MD->getNumParams()) { |
9631 | if (Diagnose) |
9632 | Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(), |
9633 | diag::note_nontrivial_default_arg) |
9634 | << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange(); |
9635 | return false; |
9636 | } |
9637 | if (MD->isVariadic()) { |
9638 | if (Diagnose) |
9639 | Diag(MD->getLocation(), diag::note_nontrivial_variadic); |
9640 | return false; |
9641 | } |
9642 | |
9643 | // C++11 [class.ctor]p5, C++11 [class.dtor]p5: |
9644 | // A copy/move [constructor or assignment operator] is trivial if |
9645 | // -- the [member] selected to copy/move each direct base class subobject |
9646 | // is trivial |
9647 | // |
9648 | // C++11 [class.copy]p12, C++11 [class.copy]p25: |
9649 | // A [default constructor or destructor] is trivial if |
9650 | // -- all the direct base classes have trivial [default constructors or |
9651 | // destructors] |
9652 | for (const auto &BI : RD->bases()) |
9653 | if (!checkTrivialSubobjectCall(*this, BI.getBeginLoc(), BI.getType(), |
9654 | ConstArg, CSM, TSK_BaseClass, TAH, Diagnose)) |
9655 | return false; |
9656 | |
9657 | // C++11 [class.ctor]p5, C++11 [class.dtor]p5: |
9658 | // A copy/move [constructor or assignment operator] for a class X is |
9659 | // trivial if |
9660 | // -- for each non-static data member of X that is of class type (or array |
9661 | // thereof), the constructor selected to copy/move that member is |
9662 | // trivial |
9663 | // |
9664 | // C++11 [class.copy]p12, C++11 [class.copy]p25: |
9665 | // A [default constructor or destructor] is trivial if |
9666 | // -- for all of the non-static data members of its class that are of class |
9667 | // type (or array thereof), each such class has a trivial [default |
9668 | // constructor or destructor] |
9669 | if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, TAH, Diagnose)) |
9670 | return false; |
9671 | |
9672 | // C++11 [class.dtor]p5: |
9673 | // A destructor is trivial if [...] |
9674 | // -- the destructor is not virtual |
9675 | if (CSM == CXXDestructor && MD->isVirtual()) { |
9676 | if (Diagnose) |
9677 | Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD; |
9678 | return false; |
9679 | } |
9680 | |
9681 | // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25: |
9682 | // A [special member] for class X is trivial if [...] |
9683 | // -- class X has no virtual functions and no virtual base classes |
9684 | if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) { |
9685 | if (!Diagnose) |
9686 | return false; |
9687 | |
9688 | if (RD->getNumVBases()) { |
9689 | // Check for virtual bases. We already know that the corresponding |
9690 | // member in all bases is trivial, so vbases must all be direct. |
9691 | CXXBaseSpecifier &BS = *RD->vbases_begin(); |
9692 | assert(BS.isVirtual())((void)0); |
9693 | Diag(BS.getBeginLoc(), diag::note_nontrivial_has_virtual) << RD << 1; |
9694 | return false; |
9695 | } |
9696 | |
9697 | // Must have a virtual method. |
9698 | for (const auto *MI : RD->methods()) { |
9699 | if (MI->isVirtual()) { |
9700 | SourceLocation MLoc = MI->getBeginLoc(); |
9701 | Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0; |
9702 | return false; |
9703 | } |
9704 | } |
9705 | |
9706 | llvm_unreachable("dynamic class with no vbases and no virtual functions")__builtin_unreachable(); |
9707 | } |
9708 | |
9709 | // Looks like it's trivial! |
9710 | return true; |
9711 | } |
9712 | |
9713 | namespace { |
9714 | struct FindHiddenVirtualMethod { |
9715 | Sema *S; |
9716 | CXXMethodDecl *Method; |
9717 | llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; |
9718 | SmallVector<CXXMethodDecl *, 8> OverloadedMethods; |
9719 | |
9720 | private: |
9721 | /// Check whether any most overridden method from MD in Methods |
9722 | static bool CheckMostOverridenMethods( |
9723 | const CXXMethodDecl *MD, |
9724 | const llvm::SmallPtrSetImpl<const CXXMethodDecl *> &Methods) { |
9725 | if (MD->size_overridden_methods() == 0) |
9726 | return Methods.count(MD->getCanonicalDecl()); |
9727 | for (const CXXMethodDecl *O : MD->overridden_methods()) |
9728 | if (CheckMostOverridenMethods(O, Methods)) |
9729 | return true; |
9730 | return false; |
9731 | } |
9732 | |
9733 | public: |
9734 | /// Member lookup function that determines whether a given C++ |
9735 | /// method overloads virtual methods in a base class without overriding any, |
9736 | /// to be used with CXXRecordDecl::lookupInBases(). |
9737 | bool operator()(const CXXBaseSpecifier *Specifier, CXXBasePath &Path) { |
9738 | RecordDecl *BaseRecord = |
9739 | Specifier->getType()->castAs<RecordType>()->getDecl(); |
9740 | |
9741 | DeclarationName Name = Method->getDeclName(); |
9742 | assert(Name.getNameKind() == DeclarationName::Identifier)((void)0); |
9743 | |
9744 | bool foundSameNameMethod = false; |
9745 | SmallVector<CXXMethodDecl *, 8> overloadedMethods; |
9746 | for (Path.Decls = BaseRecord->lookup(Name).begin(); |
9747 | Path.Decls != DeclContext::lookup_iterator(); ++Path.Decls) { |
9748 | NamedDecl *D = *Path.Decls; |
9749 | if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { |
9750 | MD = MD->getCanonicalDecl(); |
9751 | foundSameNameMethod = true; |
9752 | // Interested only in hidden virtual methods. |
9753 | if (!MD->isVirtual()) |
9754 | continue; |
9755 | // If the method we are checking overrides a method from its base |
9756 | // don't warn about the other overloaded methods. Clang deviates from |
9757 | // GCC by only diagnosing overloads of inherited virtual functions that |
9758 | // do not override any other virtual functions in the base. GCC's |
9759 | // -Woverloaded-virtual diagnoses any derived function hiding a virtual |
9760 | // function from a base class. These cases may be better served by a |
9761 | // warning (not specific to virtual functions) on call sites when the |
9762 | // call would select a different function from the base class, were it |
9763 | // visible. |
9764 | // See FIXME in test/SemaCXX/warn-overload-virtual.cpp for an example. |
9765 | if (!S->IsOverload(Method, MD, false)) |
9766 | return true; |
9767 | // Collect the overload only if its hidden. |
9768 | if (!CheckMostOverridenMethods(MD, OverridenAndUsingBaseMethods)) |
9769 | overloadedMethods.push_back(MD); |
9770 | } |
9771 | } |
9772 | |
9773 | if (foundSameNameMethod) |
9774 | OverloadedMethods.append(overloadedMethods.begin(), |
9775 | overloadedMethods.end()); |
9776 | return foundSameNameMethod; |
9777 | } |
9778 | }; |
9779 | } // end anonymous namespace |
9780 | |
9781 | /// Add the most overriden methods from MD to Methods |
9782 | static void AddMostOverridenMethods(const CXXMethodDecl *MD, |
9783 | llvm::SmallPtrSetImpl<const CXXMethodDecl *>& Methods) { |
9784 | if (MD->size_overridden_methods() == 0) |
9785 | Methods.insert(MD->getCanonicalDecl()); |
9786 | else |
9787 | for (const CXXMethodDecl *O : MD->overridden_methods()) |
9788 | AddMostOverridenMethods(O, Methods); |
9789 | } |
9790 | |
9791 | /// Check if a method overloads virtual methods in a base class without |
9792 | /// overriding any. |
9793 | void Sema::FindHiddenVirtualMethods(CXXMethodDecl *MD, |
9794 | SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) { |
9795 | if (!MD->getDeclName().isIdentifier()) |
9796 | return; |
9797 | |
9798 | CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. |
9799 | /*bool RecordPaths=*/false, |
9800 | /*bool DetectVirtual=*/false); |
9801 | FindHiddenVirtualMethod FHVM; |
9802 | FHVM.Method = MD; |
9803 | FHVM.S = this; |
9804 | |
9805 | // Keep the base methods that were overridden or introduced in the subclass |
9806 | // by 'using' in a set. A base method not in this set is hidden. |
9807 | CXXRecordDecl *DC = MD->getParent(); |
9808 | DeclContext::lookup_result R = DC->lookup(MD->getDeclName()); |
9809 | for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) { |
9810 | NamedDecl *ND = *I; |
9811 | if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I)) |
9812 | ND = shad->getTargetDecl(); |
9813 | if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND)) |
9814 | AddMostOverridenMethods(MD, FHVM.OverridenAndUsingBaseMethods); |
9815 | } |
9816 | |
9817 | if (DC->lookupInBases(FHVM, Paths)) |
9818 | OverloadedMethods = FHVM.OverloadedMethods; |
9819 | } |
9820 | |
9821 | void Sema::NoteHiddenVirtualMethods(CXXMethodDecl *MD, |
9822 | SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) { |
9823 | for (unsigned i = 0, e = OverloadedMethods.size(); i != e; ++i) { |
9824 | CXXMethodDecl *overloadedMD = OverloadedMethods[i]; |
9825 | PartialDiagnostic PD = PDiag( |
9826 | diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; |
9827 | HandleFunctionTypeMismatch(PD, MD->getType(), overloadedMD->getType()); |
9828 | Diag(overloadedMD->getLocation(), PD); |
9829 | } |
9830 | } |
9831 | |
9832 | /// Diagnose methods which overload virtual methods in a base class |
9833 | /// without overriding any. |
9834 | void Sema::DiagnoseHiddenVirtualMethods(CXXMethodDecl *MD) { |
9835 | if (MD->isInvalidDecl()) |
9836 | return; |
9837 | |
9838 | if (Diags.isIgnored(diag::warn_overloaded_virtual, MD->getLocation())) |
9839 | return; |
9840 | |
9841 | SmallVector<CXXMethodDecl *, 8> OverloadedMethods; |
9842 | FindHiddenVirtualMethods(MD, OverloadedMethods); |
9843 | if (!OverloadedMethods.empty()) { |
9844 | Diag(MD->getLocation(), diag::warn_overloaded_virtual) |
9845 | << MD << (OverloadedMethods.size() > 1); |
9846 | |
9847 | NoteHiddenVirtualMethods(MD, OverloadedMethods); |
9848 | } |
9849 | } |
9850 | |
9851 | void Sema::checkIllFormedTrivialABIStruct(CXXRecordDecl &RD) { |
9852 | auto PrintDiagAndRemoveAttr = [&](unsigned N) { |
9853 | // No diagnostics if this is a template instantiation. |
9854 | if (!isTemplateInstantiation(RD.getTemplateSpecializationKind())) { |
9855 | Diag(RD.getAttr<TrivialABIAttr>()->getLocation(), |
9856 | diag::ext_cannot_use_trivial_abi) << &RD; |
9857 | Diag(RD.getAttr<TrivialABIAttr>()->getLocation(), |
9858 | diag::note_cannot_use_trivial_abi_reason) << &RD << N; |
9859 | } |
9860 | RD.dropAttr<TrivialABIAttr>(); |
9861 | }; |
9862 | |
9863 | // Ill-formed if the copy and move constructors are deleted. |
9864 | auto HasNonDeletedCopyOrMoveConstructor = [&]() { |
9865 | // If the type is dependent, then assume it might have |
9866 | // implicit copy or move ctor because we won't know yet at this point. |
9867 | if (RD.isDependentType()) |
9868 | return true; |
9869 | if (RD.needsImplicitCopyConstructor() && |
9870 | !RD.defaultedCopyConstructorIsDeleted()) |
9871 | return true; |
9872 | if (RD.needsImplicitMoveConstructor() && |
9873 | !RD.defaultedMoveConstructorIsDeleted()) |
9874 | return true; |
9875 | for (const CXXConstructorDecl *CD : RD.ctors()) |
9876 | if (CD->isCopyOrMoveConstructor() && !CD->isDeleted()) |
9877 | return true; |
9878 | return false; |
9879 | }; |
9880 | |
9881 | if (!HasNonDeletedCopyOrMoveConstructor()) { |
9882 | PrintDiagAndRemoveAttr(0); |
9883 | return; |
9884 | } |
9885 | |
9886 | // Ill-formed if the struct has virtual functions. |
9887 | if (RD.isPolymorphic()) { |
9888 | PrintDiagAndRemoveAttr(1); |
9889 | return; |
9890 | } |
9891 | |
9892 | for (const auto &B : RD.bases()) { |
9893 | // Ill-formed if the base class is non-trivial for the purpose of calls or a |
9894 | // virtual base. |
9895 | if (!B.getType()->isDependentType() && |
9896 | !B.getType()->getAsCXXRecordDecl()->canPassInRegisters()) { |
9897 | PrintDiagAndRemoveAttr(2); |
9898 | return; |
9899 | } |
9900 | |
9901 | if (B.isVirtual()) { |
9902 | PrintDiagAndRemoveAttr(3); |
9903 | return; |
9904 | } |
9905 | } |
9906 | |
9907 | for (const auto *FD : RD.fields()) { |
9908 | // Ill-formed if the field is an ObjectiveC pointer or of a type that is |
9909 | // non-trivial for the purpose of calls. |
9910 | QualType FT = FD->getType(); |
9911 | if (FT.getObjCLifetime() == Qualifiers::OCL_Weak) { |
9912 | PrintDiagAndRemoveAttr(4); |
9913 | return; |
9914 | } |
9915 | |
9916 | if (const auto *RT = FT->getBaseElementTypeUnsafe()->getAs<RecordType>()) |
9917 | if (!RT->isDependentType() && |
9918 | !cast<CXXRecordDecl>(RT->getDecl())->canPassInRegisters()) { |
9919 | PrintDiagAndRemoveAttr(5); |
9920 | return; |
9921 | } |
9922 | } |
9923 | } |
9924 | |
9925 | void Sema::ActOnFinishCXXMemberSpecification( |
9926 | Scope *S, SourceLocation RLoc, Decl *TagDecl, SourceLocation LBrac, |
9927 | SourceLocation RBrac, const ParsedAttributesView &AttrList) { |
9928 | if (!TagDecl) |
9929 | return; |
9930 | |
9931 | AdjustDeclIfTemplate(TagDecl); |
9932 | |
9933 | for (const ParsedAttr &AL : AttrList) { |
9934 | if (AL.getKind() != ParsedAttr::AT_Visibility) |
9935 | continue; |
9936 | AL.setInvalid(); |
9937 | Diag(AL.getLoc(), diag::warn_attribute_after_definition_ignored) << AL; |
9938 | } |
9939 | |
9940 | ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( |
9941 | // strict aliasing violation! |
9942 | reinterpret_cast<Decl**>(FieldCollector->getCurFields()), |
9943 | FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); |
9944 | |
9945 | CheckCompletedCXXClass(S, cast<CXXRecordDecl>(TagDecl)); |
9946 | } |
9947 | |
9948 | /// Find the equality comparison functions that should be implicitly declared |
9949 | /// in a given class definition, per C++2a [class.compare.default]p3. |
9950 | static void findImplicitlyDeclaredEqualityComparisons( |
9951 | ASTContext &Ctx, CXXRecordDecl *RD, |
9952 | llvm::SmallVectorImpl<FunctionDecl *> &Spaceships) { |
9953 | DeclarationName EqEq = Ctx.DeclarationNames.getCXXOperatorName(OO_EqualEqual); |
9954 | if (!RD->lookup(EqEq).empty()) |
9955 | // Member operator== explicitly declared: no implicit operator==s. |
9956 | return; |
9957 | |
9958 | // Traverse friends looking for an '==' or a '<=>'. |
9959 | for (FriendDecl *Friend : RD->friends()) { |
9960 | FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(Friend->getFriendDecl()); |
9961 | if (!FD) continue; |
9962 | |
9963 | if (FD->getOverloadedOperator() == OO_EqualEqual) { |
9964 | // Friend operator== explicitly declared: no implicit operator==s. |
9965 | Spaceships.clear(); |
9966 | return; |
9967 | } |
9968 | |
9969 | if (FD->getOverloadedOperator() == OO_Spaceship && |
9970 | FD->isExplicitlyDefaulted()) |
9971 | Spaceships.push_back(FD); |
9972 | } |
9973 | |
9974 | // Look for members named 'operator<=>'. |
9975 | DeclarationName Cmp = Ctx.DeclarationNames.getCXXOperatorName(OO_Spaceship); |
9976 | for (NamedDecl *ND : RD->lookup(Cmp)) { |
9977 | // Note that we could find a non-function here (either a function template |
9978 | // or a using-declaration). Neither case results in an implicit |
9979 | // 'operator=='. |
9980 | if (auto *FD = dyn_cast<FunctionDecl>(ND)) |
9981 | if (FD->isExplicitlyDefaulted()) |
9982 | Spaceships.push_back(FD); |
9983 | } |
9984 | } |
9985 | |
9986 | /// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared |
9987 | /// special functions, such as the default constructor, copy |
9988 | /// constructor, or destructor, to the given C++ class (C++ |
9989 | /// [special]p1). This routine can only be executed just before the |
9990 | /// definition of the class is complete. |
9991 | void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { |
9992 | // Don't add implicit special members to templated classes. |
9993 | // FIXME: This means unqualified lookups for 'operator=' within a class |
9994 | // template don't work properly. |
9995 | if (!ClassDecl->isDependentType()) { |
9996 | if (ClassDecl->needsImplicitDefaultConstructor()) { |
9997 | ++getASTContext().NumImplicitDefaultConstructors; |
9998 | |
9999 | if (ClassDecl->hasInheritedConstructor()) |
10000 | DeclareImplicitDefaultConstructor(ClassDecl); |
10001 | } |
10002 | |
10003 | if (ClassDecl->needsImplicitCopyConstructor()) { |
10004 | ++getASTContext().NumImplicitCopyConstructors; |
10005 | |
10006 | // If the properties or semantics of the copy constructor couldn't be |
10007 | // determined while the class was being declared, force a declaration |
10008 | // of it now. |
10009 | if (ClassDecl->needsOverloadResolutionForCopyConstructor() || |
10010 | ClassDecl->hasInheritedConstructor()) |
10011 | DeclareImplicitCopyConstructor(ClassDecl); |
10012 | // For the MS ABI we need to know whether the copy ctor is deleted. A |
10013 | // prerequisite for deleting the implicit copy ctor is that the class has |
10014 | // a move ctor or move assignment that is either user-declared or whose |
10015 | // semantics are inherited from a subobject. FIXME: We should provide a |
10016 | // more direct way for CodeGen to ask whether the constructor was deleted. |
10017 | else if (Context.getTargetInfo().getCXXABI().isMicrosoft() && |
10018 | (ClassDecl->hasUserDeclaredMoveConstructor() || |
10019 | ClassDecl->needsOverloadResolutionForMoveConstructor() || |
10020 | ClassDecl->hasUserDeclaredMoveAssignment() || |
10021 | ClassDecl->needsOverloadResolutionForMoveAssignment())) |
10022 | DeclareImplicitCopyConstructor(ClassDecl); |
10023 | } |
10024 | |
10025 | if (getLangOpts().CPlusPlus11 && |
10026 | ClassDecl->needsImplicitMoveConstructor()) { |
10027 | ++getASTContext().NumImplicitMoveConstructors; |
10028 | |
10029 | if (ClassDecl->needsOverloadResolutionForMoveConstructor() || |
10030 | ClassDecl->hasInheritedConstructor()) |
10031 | DeclareImplicitMoveConstructor(ClassDecl); |
10032 | } |
10033 | |
10034 | if (ClassDecl->needsImplicitCopyAssignment()) { |
10035 | ++getASTContext().NumImplicitCopyAssignmentOperators; |
10036 | |
10037 | // If we have a dynamic class, then the copy assignment operator may be |
10038 | // virtual, so we have to declare it immediately. This ensures that, e.g., |
10039 | // it shows up in the right place in the vtable and that we diagnose |
10040 | // problems with the implicit exception specification. |
10041 | if (ClassDecl->isDynamicClass() || |
10042 | ClassDecl->needsOverloadResolutionForCopyAssignment() || |
10043 | ClassDecl->hasInheritedAssignment()) |
10044 | DeclareImplicitCopyAssignment(ClassDecl); |
10045 | } |
10046 | |
10047 | if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) { |
10048 | ++getASTContext().NumImplicitMoveAssignmentOperators; |
10049 | |
10050 | // Likewise for the move assignment operator. |
10051 | if (ClassDecl->isDynamicClass() || |
10052 | ClassDecl->needsOverloadResolutionForMoveAssignment() || |
10053 | ClassDecl->hasInheritedAssignment()) |
10054 | DeclareImplicitMoveAssignment(ClassDecl); |
10055 | } |
10056 | |
10057 | if (ClassDecl->needsImplicitDestructor()) { |
10058 | ++getASTContext().NumImplicitDestructors; |
10059 | |
10060 | // If we have a dynamic class, then the destructor may be virtual, so we |
10061 | // have to declare the destructor immediately. This ensures that, e.g., it |
10062 | // shows up in the right place in the vtable and that we diagnose problems |
10063 | // with the implicit exception specification. |
10064 | if (ClassDecl->isDynamicClass() || |
10065 | ClassDecl->needsOverloadResolutionForDestructor()) |
10066 | DeclareImplicitDestructor(ClassDecl); |
10067 | } |
10068 | } |
10069 | |
10070 | // C++2a [class.compare.default]p3: |
10071 | // If the member-specification does not explicitly declare any member or |
10072 | // friend named operator==, an == operator function is declared implicitly |
10073 | // for each defaulted three-way comparison operator function defined in |
10074 | // the member-specification |
10075 | // FIXME: Consider doing this lazily. |
10076 | // We do this during the initial parse for a class template, not during |
10077 | // instantiation, so that we can handle unqualified lookups for 'operator==' |
10078 | // when parsing the template. |
10079 | if (getLangOpts().CPlusPlus20 && !inTemplateInstantiation()) { |
10080 | llvm::SmallVector<FunctionDecl *, 4> DefaultedSpaceships; |
10081 | findImplicitlyDeclaredEqualityComparisons(Context, ClassDecl, |
10082 | DefaultedSpaceships); |
10083 | for (auto *FD : DefaultedSpaceships) |
10084 | DeclareImplicitEqualityComparison(ClassDecl, FD); |
10085 | } |
10086 | } |
10087 | |
10088 | unsigned |
10089 | Sema::ActOnReenterTemplateScope(Decl *D, |
10090 | llvm::function_ref<Scope *()> EnterScope) { |
10091 | if (!D) |
10092 | return 0; |
10093 | AdjustDeclIfTemplate(D); |
10094 | |
10095 | // In order to get name lookup right, reenter template scopes in order from |
10096 | // outermost to innermost. |
10097 | SmallVector<TemplateParameterList *, 4> ParameterLists; |
10098 | DeclContext *LookupDC = dyn_cast<DeclContext>(D); |
10099 | |
10100 | if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)) { |
10101 | for (unsigned i = 0; i < DD->getNumTemplateParameterLists(); ++i) |
10102 | ParameterLists.push_back(DD->getTemplateParameterList(i)); |
10103 | |
10104 | if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { |
10105 | if (FunctionTemplateDecl *FTD = FD->getDescribedFunctionTemplate()) |
10106 | ParameterLists.push_back(FTD->getTemplateParameters()); |
10107 | } else if (VarDecl *VD = dyn_cast<VarDecl>(D)) { |
10108 | LookupDC = VD->getDeclContext(); |
10109 | |
10110 | if (VarTemplateDecl *VTD = VD->getDescribedVarTemplate()) |
10111 | ParameterLists.push_back(VTD->getTemplateParameters()); |
10112 | else if (auto *PSD = dyn_cast<VarTemplatePartialSpecializationDecl>(D)) |
10113 | ParameterLists.push_back(PSD->getTemplateParameters()); |
10114 | } |
10115 | } else if (TagDecl *TD = dyn_cast<TagDecl>(D)) { |
10116 | for (unsigned i = 0; i < TD->getNumTemplateParameterLists(); ++i) |
10117 | ParameterLists.push_back(TD->getTemplateParameterList(i)); |
10118 | |
10119 | if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TD)) { |
10120 | if (ClassTemplateDecl *CTD = RD->getDescribedClassTemplate()) |
10121 | ParameterLists.push_back(CTD->getTemplateParameters()); |
10122 | else if (auto *PSD = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) |
10123 | ParameterLists.push_back(PSD->getTemplateParameters()); |
10124 | } |
10125 | } |
10126 | // FIXME: Alias declarations and concepts. |
10127 | |
10128 | unsigned Count = 0; |
10129 | Scope *InnermostTemplateScope = nullptr; |
10130 | for (TemplateParameterList *Params : ParameterLists) { |
10131 | // Ignore explicit specializations; they don't contribute to the template |
10132 | // depth. |
10133 | if (Params->size() == 0) |
10134 | continue; |
10135 | |
10136 | InnermostTemplateScope = EnterScope(); |
10137 | for (NamedDecl *Param : *Params) { |
10138 | if (Param->getDeclName()) { |
10139 | InnermostTemplateScope->AddDecl(Param); |
10140 | IdResolver.AddDecl(Param); |
10141 | } |
10142 | } |
10143 | ++Count; |
10144 | } |
10145 | |
10146 | // Associate the new template scopes with the corresponding entities. |
10147 | if (InnermostTemplateScope) { |
10148 | assert(LookupDC && "no enclosing DeclContext for template lookup")((void)0); |
10149 | EnterTemplatedContext(InnermostTemplateScope, LookupDC); |
10150 | } |
10151 | |
10152 | return Count; |
10153 | } |
10154 | |
10155 | void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { |
10156 | if (!RecordD) return; |
10157 | AdjustDeclIfTemplate(RecordD); |
10158 | CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); |
10159 | PushDeclContext(S, Record); |
10160 | } |
10161 | |
10162 | void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { |
10163 | if (!RecordD) return; |
10164 | PopDeclContext(); |
10165 | } |
10166 | |
10167 | /// This is used to implement the constant expression evaluation part of the |
10168 | /// attribute enable_if extension. There is nothing in standard C++ which would |
10169 | /// require reentering parameters. |
10170 | void Sema::ActOnReenterCXXMethodParameter(Scope *S, ParmVarDecl *Param) { |
10171 | if (!Param) |
10172 | return; |
10173 | |
10174 | S->AddDecl(Param); |
10175 | if (Param->getDeclName()) |
10176 | IdResolver.AddDecl(Param); |
10177 | } |
10178 | |
10179 | /// ActOnStartDelayedCXXMethodDeclaration - We have completed |
10180 | /// parsing a top-level (non-nested) C++ class, and we are now |
10181 | /// parsing those parts of the given Method declaration that could |
10182 | /// not be parsed earlier (C++ [class.mem]p2), such as default |
10183 | /// arguments. This action should enter the scope of the given |
10184 | /// Method declaration as if we had just parsed the qualified method |
10185 | /// name. However, it should not bring the parameters into scope; |
10186 | /// that will be performed by ActOnDelayedCXXMethodParameter. |
10187 | void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { |
10188 | } |
10189 | |
10190 | /// ActOnDelayedCXXMethodParameter - We've already started a delayed |
10191 | /// C++ method declaration. We're (re-)introducing the given |
10192 | /// function parameter into scope for use in parsing later parts of |
10193 | /// the method declaration. For example, we could see an |
10194 | /// ActOnParamDefaultArgument event for this parameter. |
10195 | void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { |
10196 | if (!ParamD) |
10197 | return; |
10198 | |
10199 | ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); |
10200 | |
10201 | S->AddDecl(Param); |
10202 | if (Param->getDeclName()) |
10203 | IdResolver.AddDecl(Param); |
10204 | } |
10205 | |
10206 | /// ActOnFinishDelayedCXXMethodDeclaration - We have finished |
10207 | /// processing the delayed method declaration for Method. The method |
10208 | /// declaration is now considered finished. There may be a separate |
10209 | /// ActOnStartOfFunctionDef action later (not necessarily |
10210 | /// immediately!) for this method, if it was also defined inside the |
10211 | /// class body. |
10212 | void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { |
10213 | if (!MethodD) |
10214 | return; |
10215 | |
10216 | AdjustDeclIfTemplate(MethodD); |
10217 | |
10218 | FunctionDecl *Method = cast<FunctionDecl>(MethodD); |
10219 | |
10220 | // Now that we have our default arguments, check the constructor |
10221 | // again. It could produce additional diagnostics or affect whether |
10222 | // the class has implicitly-declared destructors, among other |
10223 | // things. |
10224 | if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) |
10225 | CheckConstructor(Constructor); |
10226 | |
10227 | // Check the default arguments, which we may have added. |
10228 | if (!Method->isInvalidDecl()) |
10229 | CheckCXXDefaultArguments(Method); |
10230 | } |
10231 | |
10232 | // Emit the given diagnostic for each non-address-space qualifier. |
10233 | // Common part of CheckConstructorDeclarator and CheckDestructorDeclarator. |
10234 | static void checkMethodTypeQualifiers(Sema &S, Declarator &D, unsigned DiagID) { |
10235 | const DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); |
10236 | if (FTI.hasMethodTypeQualifiers() && !D.isInvalidType()) { |
10237 | bool DiagOccured = false; |
10238 | FTI.MethodQualifiers->forEachQualifier( |
10239 | [DiagID, &S, &DiagOccured](DeclSpec::TQ, StringRef QualName, |
10240 | SourceLocation SL) { |
10241 | // This diagnostic should be emitted on any qualifier except an addr |
10242 | // space qualifier. However, forEachQualifier currently doesn't visit |
10243 | // addr space qualifiers, so there's no way to write this condition |
10244 | // right now; we just diagnose on everything. |
10245 | S.Diag(SL, DiagID) << QualName << SourceRange(SL); |
10246 | DiagOccured = true; |
10247 | }); |
10248 | if (DiagOccured) |
10249 | D.setInvalidType(); |
10250 | } |
10251 | } |
10252 | |
10253 | /// CheckConstructorDeclarator - Called by ActOnDeclarator to check |
10254 | /// the well-formedness of the constructor declarator @p D with type @p |
10255 | /// R. If there are any errors in the declarator, this routine will |
10256 | /// emit diagnostics and set the invalid bit to true. In any case, the type |
10257 | /// will be updated to reflect a well-formed type for the constructor and |
10258 | /// returned. |
10259 | QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, |
10260 | StorageClass &SC) { |
10261 | bool isVirtual = D.getDeclSpec().isVirtualSpecified(); |
10262 | |
10263 | // C++ [class.ctor]p3: |
10264 | // A constructor shall not be virtual (10.3) or static (9.4). A |
10265 | // constructor can be invoked for a const, volatile or const |
10266 | // volatile object. A constructor shall not be declared const, |
10267 | // volatile, or const volatile (9.3.2). |
10268 | if (isVirtual) { |
10269 | if (!D.isInvalidType()) |
10270 | Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) |
10271 | << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) |
10272 | << SourceRange(D.getIdentifierLoc()); |
10273 | D.setInvalidType(); |
10274 | } |
10275 | if (SC == SC_Static) { |
10276 | if (!D.isInvalidType()) |
10277 | Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) |
10278 | << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) |
10279 | << SourceRange(D.getIdentifierLoc()); |
10280 | D.setInvalidType(); |
10281 | SC = SC_None; |
10282 | } |
10283 | |
10284 | if (unsigned TypeQuals = D.getDeclSpec().getTypeQualifiers()) { |
10285 | diagnoseIgnoredQualifiers( |
10286 | diag::err_constructor_return_type, TypeQuals, SourceLocation(), |
10287 | D.getDeclSpec().getConstSpecLoc(), D.getDeclSpec().getVolatileSpecLoc(), |
10288 | D.getDeclSpec().getRestrictSpecLoc(), |
10289 | D.getDeclSpec().getAtomicSpecLoc()); |
10290 | D.setInvalidType(); |
10291 | } |
10292 | |
10293 | checkMethodTypeQualifiers(*this, D, diag::err_invalid_qualified_constructor); |
10294 | |
10295 | // C++0x [class.ctor]p4: |
10296 | // A constructor shall not be declared with a ref-qualifier. |
10297 | DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); |
10298 | if (FTI.hasRefQualifier()) { |
10299 | Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) |
10300 | << FTI.RefQualifierIsLValueRef |
10301 | << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); |
10302 | D.setInvalidType(); |
10303 | } |
10304 | |
10305 | // Rebuild the function type "R" without any type qualifiers (in |
10306 | // case any of the errors above fired) and with "void" as the |
10307 | // return type, since constructors don't have return types. |
10308 | const FunctionProtoType *Proto = R->castAs<FunctionProtoType>(); |
10309 | if (Proto->getReturnType() == Context.VoidTy && !D.isInvalidType()) |
10310 | return R; |
10311 | |
10312 | FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); |
10313 | EPI.TypeQuals = Qualifiers(); |
10314 | EPI.RefQualifier = RQ_None; |
10315 | |
10316 | return Context.getFunctionType(Context.VoidTy, Proto->getParamTypes(), EPI); |
10317 | } |
10318 | |
10319 | /// CheckConstructor - Checks a fully-formed constructor for |
10320 | /// well-formedness, issuing any diagnostics required. Returns true if |
10321 | /// the constructor declarator is invalid. |
10322 | void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { |
10323 | CXXRecordDecl *ClassDecl |
10324 | = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); |
10325 | if (!ClassDecl) |
10326 | return Constructor->setInvalidDecl(); |
10327 | |
10328 | // C++ [class.copy]p3: |
10329 | // A declaration of a constructor for a class X is ill-formed if |
10330 | // its first parameter is of type (optionally cv-qualified) X and |
10331 | // either there are no other parameters or else all other |
10332 | // parameters have default arguments. |
10333 | if (!Constructor->isInvalidDecl() && |
10334 | Constructor->hasOneParamOrDefaultArgs() && |
10335 | Constructor->getTemplateSpecializationKind() != |
10336 | TSK_ImplicitInstantiation) { |
10337 | QualType ParamType = Constructor->getParamDecl(0)->getType(); |
10338 | QualType ClassTy = Context.getTagDeclType(ClassDecl); |
10339 | if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { |
10340 | SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); |
10341 | const char *ConstRef |
10342 | = Constructor->getParamDecl(0)->getIdentifier() ? "const &" |
10343 | : " const &"; |
10344 | Diag(ParamLoc, diag::err_constructor_byvalue_arg) |
10345 | << FixItHint::CreateInsertion(ParamLoc, ConstRef); |
10346 | |
10347 | // FIXME: Rather that making the constructor invalid, we should endeavor |
10348 | // to fix the type. |
10349 | Constructor->setInvalidDecl(); |
10350 | } |
10351 | } |
10352 | } |
10353 | |
10354 | /// CheckDestructor - Checks a fully-formed destructor definition for |
10355 | /// well-formedness, issuing any diagnostics required. Returns true |
10356 | /// on error. |
10357 | bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { |
10358 | CXXRecordDecl *RD = Destructor->getParent(); |
10359 | |
10360 | if (!Destructor->getOperatorDelete() && Destructor->isVirtual()) { |
10361 | SourceLocation Loc; |
10362 | |
10363 | if (!Destructor->isImplicit()) |
10364 | Loc = Destructor->getLocation(); |
10365 | else |
10366 | Loc = RD->getLocation(); |
10367 | |
10368 | // If we have a virtual destructor, look up the deallocation function |
10369 | if (FunctionDecl *OperatorDelete = |
10370 | FindDeallocationFunctionForDestructor(Loc, RD)) { |
10371 | Expr *ThisArg = nullptr; |
10372 | |
10373 | // If the notional 'delete this' expression requires a non-trivial |
10374 | // conversion from 'this' to the type of a destroying operator delete's |
10375 | // first parameter, perform that conversion now. |
10376 | if (OperatorDelete->isDestroyingOperatorDelete()) { |
10377 | QualType ParamType = OperatorDelete->getParamDecl(0)->getType(); |
10378 | if (!declaresSameEntity(ParamType->getAsCXXRecordDecl(), RD)) { |
10379 | // C++ [class.dtor]p13: |
10380 | // ... as if for the expression 'delete this' appearing in a |
10381 | // non-virtual destructor of the destructor's class. |
10382 | ContextRAII SwitchContext(*this, Destructor); |
10383 | ExprResult This = |
10384 | ActOnCXXThis(OperatorDelete->getParamDecl(0)->getLocation()); |
10385 | assert(!This.isInvalid() && "couldn't form 'this' expr in dtor?")((void)0); |
10386 | This = PerformImplicitConversion(This.get(), ParamType, AA_Passing); |
10387 | if (This.isInvalid()) { |
10388 | // FIXME: Register this as a context note so that it comes out |
10389 | // in the right order. |
10390 | Diag(Loc, diag::note_implicit_delete_this_in_destructor_here); |
10391 | return true; |
10392 | } |
10393 | ThisArg = This.get(); |
10394 | } |
10395 | } |
10396 | |
10397 | DiagnoseUseOfDecl(OperatorDelete, Loc); |
10398 | MarkFunctionReferenced(Loc, OperatorDelete); |
10399 | Destructor->setOperatorDelete(OperatorDelete, ThisArg); |
10400 | } |
10401 | } |
10402 | |
10403 | return false; |
10404 | } |
10405 | |
10406 | /// CheckDestructorDeclarator - Called by ActOnDeclarator to check |
10407 | /// the well-formednes of the destructor declarator @p D with type @p |
10408 | /// R. If there are any errors in the declarator, this routine will |
10409 | /// emit diagnostics and set the declarator to invalid. Even if this happens, |
10410 | /// will be updated to reflect a well-formed type for the destructor and |
10411 | /// returned. |
10412 | QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, |
10413 | StorageClass& SC) { |
10414 | // C++ [class.dtor]p1: |
10415 | // [...] A typedef-name that names a class is a class-name |
10416 | // (7.1.3); however, a typedef-name that names a class shall not |
10417 | // be used as the identifier in the declarator for a destructor |
10418 | // declaration. |
10419 | QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); |
10420 | if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) |
10421 | Diag(D.getIdentifierLoc(), diag::ext_destructor_typedef_name) |
10422 | << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); |
10423 | else if (const TemplateSpecializationType *TST = |
10424 | DeclaratorType->getAs<TemplateSpecializationType>()) |
10425 | if (TST->isTypeAlias()) |
10426 | Diag(D.getIdentifierLoc(), diag::ext_destructor_typedef_name) |
10427 | << DeclaratorType << 1; |
10428 | |
10429 | // C++ [class.dtor]p2: |
10430 | // A destructor is used to destroy objects of its class type. A |
10431 | // destructor takes no parameters, and no return type can be |
10432 | // specified for it (not even void). The address of a destructor |
10433 | // shall not be taken. A destructor shall not be static. A |
10434 | // destructor can be invoked for a const, volatile or const |
10435 | // volatile object. A destructor shall not be declared const, |
10436 | // volatile or const volatile (9.3.2). |
10437 | if (SC == SC_Static) { |
10438 | if (!D.isInvalidType()) |
10439 | Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) |
10440 | << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) |
10441 | << SourceRange(D.getIdentifierLoc()) |
10442 | << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); |
10443 | |
10444 | SC = SC_None; |
10445 | } |
10446 | if (!D.isInvalidType()) { |
10447 | // Destructors don't have return types, but the parser will |
10448 | // happily parse something like: |
10449 | // |
10450 | // class X { |
10451 | // float ~X(); |
10452 | // }; |
10453 | // |
10454 | // The return type will be eliminated later. |
10455 | if (D.getDeclSpec().hasTypeSpecifier()) |
10456 | Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) |
10457 | << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) |
10458 | << SourceRange(D.getIdentifierLoc()); |
10459 | else if (unsigned TypeQuals = D.getDeclSpec().getTypeQualifiers()) { |
10460 | diagnoseIgnoredQualifiers(diag::err_destructor_return_type, TypeQuals, |
10461 | SourceLocation(), |
10462 | D.getDeclSpec().getConstSpecLoc(), |
10463 | D.getDeclSpec().getVolatileSpecLoc(), |
10464 | D.getDeclSpec().getRestrictSpecLoc(), |
10465 | D.getDeclSpec().getAtomicSpecLoc()); |
10466 | D.setInvalidType(); |
10467 | } |
10468 | } |
10469 | |
10470 | checkMethodTypeQualifiers(*this, D, diag::err_invalid_qualified_destructor); |
10471 | |
10472 | // C++0x [class.dtor]p2: |
10473 | // A destructor shall not be declared with a ref-qualifier. |
10474 | DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); |
10475 | if (FTI.hasRefQualifier()) { |
10476 | Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) |
10477 | << FTI.RefQualifierIsLValueRef |
10478 | << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); |
10479 | D.setInvalidType(); |
10480 | } |
10481 | |
10482 | // Make sure we don't have any parameters. |
10483 | if (FTIHasNonVoidParameters(FTI)) { |
10484 | Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); |
10485 | |
10486 | // Delete the parameters. |
10487 | FTI.freeParams(); |
10488 | D.setInvalidType(); |
10489 | } |
10490 | |
10491 | // Make sure the destructor isn't variadic. |
10492 | if (FTI.isVariadic) { |
10493 | Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); |
10494 | D.setInvalidType(); |
10495 | } |
10496 | |
10497 | // Rebuild the function type "R" without any type qualifiers or |
10498 | // parameters (in case any of the errors above fired) and with |
10499 | // "void" as the return type, since destructors don't have return |
10500 | // types. |
10501 | if (!D.isInvalidType()) |
10502 | return R; |
10503 | |
10504 | const FunctionProtoType *Proto = R->castAs<FunctionProtoType>(); |
10505 | FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); |
10506 | EPI.Variadic = false; |
10507 | EPI.TypeQuals = Qualifiers(); |
10508 | EPI.RefQualifier = RQ_None; |
10509 | return Context.getFunctionType(Context.VoidTy, None, EPI); |
10510 | } |
10511 | |
10512 | static void extendLeft(SourceRange &R, SourceRange Before) { |
10513 | if (Before.isInvalid()) |
10514 | return; |
10515 | R.setBegin(Before.getBegin()); |
10516 | if (R.getEnd().isInvalid()) |
10517 | R.setEnd(Before.getEnd()); |
10518 | } |
10519 | |
10520 | static void extendRight(SourceRange &R, SourceRange After) { |
10521 | if (After.isInvalid()) |
10522 | return; |
10523 | if (R.getBegin().isInvalid()) |
10524 | R.setBegin(After.getBegin()); |
10525 | R.setEnd(After.getEnd()); |
10526 | } |
10527 | |
10528 | /// CheckConversionDeclarator - Called by ActOnDeclarator to check the |
10529 | /// well-formednes of the conversion function declarator @p D with |
10530 | /// type @p R. If there are any errors in the declarator, this routine |
10531 | /// will emit diagnostics and return true. Otherwise, it will return |
10532 | /// false. Either way, the type @p R will be updated to reflect a |
10533 | /// well-formed type for the conversion operator. |
10534 | void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, |
10535 | StorageClass& SC) { |
10536 | // C++ [class.conv.fct]p1: |
10537 | // Neither parameter types nor return type can be specified. The |
10538 | // type of a conversion function (8.3.5) is "function taking no |
10539 | // parameter returning conversion-type-id." |
10540 | if (SC == SC_Static) { |
10541 | if (!D.isInvalidType()) |
10542 | Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) |
10543 | << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) |
10544 | << D.getName().getSourceRange(); |
10545 | D.setInvalidType(); |
10546 | SC = SC_None; |
10547 | } |
10548 | |
10549 | TypeSourceInfo *ConvTSI = nullptr; |
10550 | QualType ConvType = |
10551 | GetTypeFromParser(D.getName().ConversionFunctionId, &ConvTSI); |
10552 | |
10553 | const DeclSpec &DS = D.getDeclSpec(); |
10554 | if (DS.hasTypeSpecifier() && !D.isInvalidType()) { |
10555 | // Conversion functions don't have return types, but the parser will |
10556 | // happily parse something like: |
10557 | // |
10558 | // class X { |
10559 | // float operator bool(); |
10560 | // }; |
10561 | // |
10562 | // The return type will be changed later anyway. |
10563 | Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) |
10564 | << SourceRange(DS.getTypeSpecTypeLoc()) |
10565 | << SourceRange(D.getIdentifierLoc()); |
10566 | D.setInvalidType(); |
10567 | } else if (DS.getTypeQualifiers() && !D.isInvalidType()) { |
10568 | // It's also plausible that the user writes type qualifiers in the wrong |
10569 | // place, such as: |
10570 | // struct S { const operator int(); }; |
10571 | // FIXME: we could provide a fixit to move the qualifiers onto the |
10572 | // conversion type. |
10573 | Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) |
10574 | << SourceRange(D.getIdentifierLoc()) << 0; |
10575 | D.setInvalidType(); |
10576 | } |
10577 | |
10578 | const auto *Proto = R->castAs<FunctionProtoType>(); |
10579 | |
10580 | // Make sure we don't have any parameters. |
10581 | if (Proto->getNumParams() > 0) { |
10582 | Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); |
10583 | |
10584 | // Delete the parameters. |
10585 | D.getFunctionTypeInfo().freeParams(); |
10586 | D.setInvalidType(); |
10587 | } else if (Proto->isVariadic()) { |
10588 | Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); |
10589 | D.setInvalidType(); |
10590 | } |
10591 | |
10592 | // Diagnose "&operator bool()" and other such nonsense. This |
10593 | // is actually a gcc extension which we don't support. |
10594 | if (Proto->getReturnType() != ConvType) { |
10595 | bool NeedsTypedef = false; |
10596 | SourceRange Before, After; |
10597 | |
10598 | // Walk the chunks and extract information on them for our diagnostic. |
10599 | bool PastFunctionChunk = false; |
10600 | for (auto &Chunk : D.type_objects()) { |
10601 | switch (Chunk.Kind) { |
10602 | case DeclaratorChunk::Function: |
10603 | if (!PastFunctionChunk) { |
10604 | if (Chunk.Fun.HasTrailingReturnType) { |
10605 | TypeSourceInfo *TRT = nullptr; |
10606 | GetTypeFromParser(Chunk.Fun.getTrailingReturnType(), &TRT); |
10607 | if (TRT) extendRight(After, TRT->getTypeLoc().getSourceRange()); |
10608 | } |
10609 | PastFunctionChunk = true; |
10610 | break; |
10611 | } |
10612 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; |
10613 | case DeclaratorChunk::Array: |
10614 | NeedsTypedef = true; |
10615 | extendRight(After, Chunk.getSourceRange()); |
10616 | break; |
10617 | |
10618 | case DeclaratorChunk::Pointer: |
10619 | case DeclaratorChunk::BlockPointer: |
10620 | case DeclaratorChunk::Reference: |
10621 | case DeclaratorChunk::MemberPointer: |
10622 | case DeclaratorChunk::Pipe: |
10623 | extendLeft(Before, Chunk.getSourceRange()); |
10624 | break; |
10625 | |
10626 | case DeclaratorChunk::Paren: |
10627 | extendLeft(Before, Chunk.Loc); |
10628 | extendRight(After, Chunk.EndLoc); |
10629 | break; |
10630 | } |
10631 | } |
10632 | |
10633 | SourceLocation Loc = Before.isValid() ? Before.getBegin() : |
10634 | After.isValid() ? After.getBegin() : |
10635 | D.getIdentifierLoc(); |
10636 | auto &&DB = Diag(Loc, diag::err_conv_function_with_complex_decl); |
10637 | DB << Before << After; |
10638 | |
10639 | if (!NeedsTypedef) { |
10640 | DB << /*don't need a typedef*/0; |
10641 | |
10642 | // If we can provide a correct fix-it hint, do so. |
10643 | if (After.isInvalid() && ConvTSI) { |
10644 | SourceLocation InsertLoc = |
10645 | getLocForEndOfToken(ConvTSI->getTypeLoc().getEndLoc()); |
10646 | DB << FixItHint::CreateInsertion(InsertLoc, " ") |
10647 | << FixItHint::CreateInsertionFromRange( |
10648 | InsertLoc, CharSourceRange::getTokenRange(Before)) |
10649 | << FixItHint::CreateRemoval(Before); |
10650 | } |
10651 | } else if (!Proto->getReturnType()->isDependentType()) { |
10652 | DB << /*typedef*/1 << Proto->getReturnType(); |
10653 | } else if (getLangOpts().CPlusPlus11) { |
10654 | DB << /*alias template*/2 << Proto->getReturnType(); |
10655 | } else { |
10656 | DB << /*might not be fixable*/3; |
10657 | } |
10658 | |
10659 | // Recover by incorporating the other type chunks into the result type. |
10660 | // Note, this does *not* change the name of the function. This is compatible |
10661 | // with the GCC extension: |
10662 | // struct S { &operator int(); } s; |
10663 | // int &r = s.operator int(); // ok in GCC |
10664 | // S::operator int&() {} // error in GCC, function name is 'operator int'. |
10665 | ConvType = Proto->getReturnType(); |
10666 | } |
10667 | |
10668 | // C++ [class.conv.fct]p4: |
10669 | // The conversion-type-id shall not represent a function type nor |
10670 | // an array type. |
10671 | if (ConvType->isArrayType()) { |
10672 | Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); |
10673 | ConvType = Context.getPointerType(ConvType); |
10674 | D.setInvalidType(); |
10675 | } else if (ConvType->isFunctionType()) { |
10676 | Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); |
10677 | ConvType = Context.getPointerType(ConvType); |
10678 | D.setInvalidType(); |
10679 | } |
10680 | |
10681 | // Rebuild the function type "R" without any parameters (in case any |
10682 | // of the errors above fired) and with the conversion type as the |
10683 | // return type. |
10684 | if (D.isInvalidType()) |
10685 | R = Context.getFunctionType(ConvType, None, Proto->getExtProtoInfo()); |
10686 | |
10687 | // C++0x explicit conversion operators. |
10688 | if (DS.hasExplicitSpecifier() && !getLangOpts().CPlusPlus20) |
10689 | Diag(DS.getExplicitSpecLoc(), |
10690 | getLangOpts().CPlusPlus11 |
10691 | ? diag::warn_cxx98_compat_explicit_conversion_functions |
10692 | : diag::ext_explicit_conversion_functions) |
10693 | << SourceRange(DS.getExplicitSpecRange()); |
10694 | } |
10695 | |
10696 | /// ActOnConversionDeclarator - Called by ActOnDeclarator to complete |
10697 | /// the declaration of the given C++ conversion function. This routine |
10698 | /// is responsible for recording the conversion function in the C++ |
10699 | /// class, if possible. |
10700 | Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { |
10701 | assert(Conversion && "Expected to receive a conversion function declaration")((void)0); |
10702 | |
10703 | CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); |
10704 | |
10705 | // Make sure we aren't redeclaring the conversion function. |
10706 | QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); |
10707 | // C++ [class.conv.fct]p1: |
10708 | // [...] A conversion function is never used to convert a |
10709 | // (possibly cv-qualified) object to the (possibly cv-qualified) |
10710 | // same object type (or a reference to it), to a (possibly |
10711 | // cv-qualified) base class of that type (or a reference to it), |
10712 | // or to (possibly cv-qualified) void. |
10713 | QualType ClassType |
10714 | = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); |
10715 | if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) |
10716 | ConvType = ConvTypeRef->getPointeeType(); |
10717 | if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && |
10718 | Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) |
10719 | /* Suppress diagnostics for instantiations. */; |
10720 | else if (Conversion->size_overridden_methods() != 0) |
10721 | /* Suppress diagnostics for overriding virtual function in a base class. */; |
10722 | else if (ConvType->isRecordType()) { |
10723 | ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); |
10724 | if (ConvType == ClassType) |
10725 | Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) |
10726 | << ClassType; |
10727 | else if (IsDerivedFrom(Conversion->getLocation(), ClassType, ConvType)) |
10728 | Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) |
10729 | << ClassType << ConvType; |
10730 | } else if (ConvType->isVoidType()) { |
10731 | Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) |
10732 | << ClassType << ConvType; |
10733 | } |
10734 | |
10735 | if (FunctionTemplateDecl *ConversionTemplate |
10736 | = Conversion->getDescribedFunctionTemplate()) |
10737 | return ConversionTemplate; |
10738 | |
10739 | return Conversion; |
10740 | } |
10741 | |
10742 | namespace { |
10743 | /// Utility class to accumulate and print a diagnostic listing the invalid |
10744 | /// specifier(s) on a declaration. |
10745 | struct BadSpecifierDiagnoser { |
10746 | BadSpecifierDiagnoser(Sema &S, SourceLocation Loc, unsigned DiagID) |
10747 | : S(S), Diagnostic(S.Diag(Loc, DiagID)) {} |
10748 | ~BadSpecifierDiagnoser() { |
10749 | Diagnostic << Specifiers; |
10750 | } |
10751 | |
10752 | template<typename T> void check(SourceLocation SpecLoc, T Spec) { |
10753 | return check(SpecLoc, DeclSpec::getSpecifierName(Spec)); |
10754 | } |
10755 | void check(SourceLocation SpecLoc, DeclSpec::TST Spec) { |
10756 | return check(SpecLoc, |
10757 | DeclSpec::getSpecifierName(Spec, S.getPrintingPolicy())); |
10758 | } |
10759 | void check(SourceLocation SpecLoc, const char *Spec) { |
10760 | if (SpecLoc.isInvalid()) return; |
10761 | Diagnostic << SourceRange(SpecLoc, SpecLoc); |
10762 | if (!Specifiers.empty()) Specifiers += " "; |
10763 | Specifiers += Spec; |
10764 | } |
10765 | |
10766 | Sema &S; |
10767 | Sema::SemaDiagnosticBuilder Diagnostic; |
10768 | std::string Specifiers; |
10769 | }; |
10770 | } |
10771 | |
10772 | /// Check the validity of a declarator that we parsed for a deduction-guide. |
10773 | /// These aren't actually declarators in the grammar, so we need to check that |
10774 | /// the user didn't specify any pieces that are not part of the deduction-guide |
10775 | /// grammar. |
10776 | void Sema::CheckDeductionGuideDeclarator(Declarator &D, QualType &R, |
10777 | StorageClass &SC) { |
10778 | TemplateName GuidedTemplate = D.getName().TemplateName.get().get(); |
10779 | TemplateDecl *GuidedTemplateDecl = GuidedTemplate.getAsTemplateDecl(); |
10780 | assert(GuidedTemplateDecl && "missing template decl for deduction guide")((void)0); |
10781 | |
10782 | // C++ [temp.deduct.guide]p3: |
10783 | // A deduction-gide shall be declared in the same scope as the |
10784 | // corresponding class template. |
10785 | if (!CurContext->getRedeclContext()->Equals( |
10786 | GuidedTemplateDecl->getDeclContext()->getRedeclContext())) { |
10787 | Diag(D.getIdentifierLoc(), diag::err_deduction_guide_wrong_scope) |
10788 | << GuidedTemplateDecl; |
10789 | Diag(GuidedTemplateDecl->getLocation(), diag::note_template_decl_here); |
10790 | } |
10791 | |
10792 | auto &DS = D.getMutableDeclSpec(); |
10793 | // We leave 'friend' and 'virtual' to be rejected in the normal way. |
10794 | if (DS.hasTypeSpecifier() || DS.getTypeQualifiers() || |
10795 | DS.getStorageClassSpecLoc().isValid() || DS.isInlineSpecified() || |
10796 | DS.isNoreturnSpecified() || DS.hasConstexprSpecifier()) { |
10797 | BadSpecifierDiagnoser Diagnoser( |
10798 | *this, D.getIdentifierLoc(), |
10799 | diag::err_deduction_guide_invalid_specifier); |
10800 | |
10801 | Diagnoser.check(DS.getStorageClassSpecLoc(), DS.getStorageClassSpec()); |
10802 | DS.ClearStorageClassSpecs(); |
10803 | SC = SC_None; |
10804 | |
10805 | // 'explicit' is permitted. |
10806 | Diagnoser.check(DS.getInlineSpecLoc(), "inline"); |
10807 | Diagnoser.check(DS.getNoreturnSpecLoc(), "_Noreturn"); |
10808 | Diagnoser.check(DS.getConstexprSpecLoc(), "constexpr"); |
10809 | DS.ClearConstexprSpec(); |
10810 | |
10811 | Diagnoser.check(DS.getConstSpecLoc(), "const"); |
10812 | Diagnoser.check(DS.getRestrictSpecLoc(), "__restrict"); |
10813 | Diagnoser.check(DS.getVolatileSpecLoc(), "volatile"); |
10814 | Diagnoser.check(DS.getAtomicSpecLoc(), "_Atomic"); |
10815 | Diagnoser.check(DS.getUnalignedSpecLoc(), "__unaligned"); |
10816 | DS.ClearTypeQualifiers(); |
10817 | |
10818 | Diagnoser.check(DS.getTypeSpecComplexLoc(), DS.getTypeSpecComplex()); |
10819 | Diagnoser.check(DS.getTypeSpecSignLoc(), DS.getTypeSpecSign()); |
10820 | Diagnoser.check(DS.getTypeSpecWidthLoc(), DS.getTypeSpecWidth()); |
10821 | Diagnoser.check(DS.getTypeSpecTypeLoc(), DS.getTypeSpecType()); |
10822 | DS.ClearTypeSpecType(); |
10823 | } |
10824 | |
10825 | if (D.isInvalidType()) |
10826 | return; |
10827 | |
10828 | // Check the declarator is simple enough. |
10829 | bool FoundFunction = false; |
10830 | for (const DeclaratorChunk &Chunk : llvm::reverse(D.type_objects())) { |
10831 | if (Chunk.Kind == DeclaratorChunk::Paren) |
10832 | continue; |
10833 | if (Chunk.Kind != DeclaratorChunk::Function || FoundFunction) { |
10834 | Diag(D.getDeclSpec().getBeginLoc(), |
10835 | diag::err_deduction_guide_with_complex_decl) |
10836 | << D.getSourceRange(); |
10837 | break; |
10838 | } |
10839 | if (!Chunk.Fun.hasTrailingReturnType()) { |
10840 | Diag(D.getName().getBeginLoc(), |
10841 | diag::err_deduction_guide_no_trailing_return_type); |
10842 | break; |
10843 | } |
10844 | |
10845 | // Check that the return type is written as a specialization of |
10846 | // the template specified as the deduction-guide's name. |
10847 | ParsedType TrailingReturnType = Chunk.Fun.getTrailingReturnType(); |
10848 | TypeSourceInfo *TSI = nullptr; |
10849 | QualType RetTy = GetTypeFromParser(TrailingReturnType, &TSI); |
10850 | assert(TSI && "deduction guide has valid type but invalid return type?")((void)0); |
10851 | bool AcceptableReturnType = false; |
10852 | bool MightInstantiateToSpecialization = false; |
10853 | if (auto RetTST = |
10854 | TSI->getTypeLoc().getAs<TemplateSpecializationTypeLoc>()) { |
10855 | TemplateName SpecifiedName = RetTST.getTypePtr()->getTemplateName(); |
10856 | bool TemplateMatches = |
10857 | Context.hasSameTemplateName(SpecifiedName, GuidedTemplate); |
10858 | if (SpecifiedName.getKind() == TemplateName::Template && TemplateMatches) |
10859 | AcceptableReturnType = true; |
10860 | else { |
10861 | // This could still instantiate to the right type, unless we know it |
10862 | // names the wrong class template. |
10863 | auto *TD = SpecifiedName.getAsTemplateDecl(); |
10864 | MightInstantiateToSpecialization = !(TD && isa<ClassTemplateDecl>(TD) && |
10865 | !TemplateMatches); |
10866 | } |
10867 | } else if (!RetTy.hasQualifiers() && RetTy->isDependentType()) { |
10868 | MightInstantiateToSpecialization = true; |
10869 | } |
10870 | |
10871 | if (!AcceptableReturnType) { |
10872 | Diag(TSI->getTypeLoc().getBeginLoc(), |
10873 | diag::err_deduction_guide_bad_trailing_return_type) |
10874 | << GuidedTemplate << TSI->getType() |
10875 | << MightInstantiateToSpecialization |
10876 | << TSI->getTypeLoc().getSourceRange(); |
10877 | } |
10878 | |
10879 | // Keep going to check that we don't have any inner declarator pieces (we |
10880 | // could still have a function returning a pointer to a function). |
10881 | FoundFunction = true; |
10882 | } |
10883 | |
10884 | if (D.isFunctionDefinition()) |
10885 | Diag(D.getIdentifierLoc(), diag::err_deduction_guide_defines_function); |
10886 | } |
10887 | |
10888 | //===----------------------------------------------------------------------===// |
10889 | // Namespace Handling |
10890 | //===----------------------------------------------------------------------===// |
10891 | |
10892 | /// Diagnose a mismatch in 'inline' qualifiers when a namespace is |
10893 | /// reopened. |
10894 | static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc, |
10895 | SourceLocation Loc, |
10896 | IdentifierInfo *II, bool *IsInline, |
10897 | NamespaceDecl *PrevNS) { |
10898 | assert(*IsInline != PrevNS->isInline())((void)0); |
10899 | |
10900 | if (PrevNS->isInline()) |
10901 | // The user probably just forgot the 'inline', so suggest that it |
10902 | // be added back. |
10903 | S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline) |
10904 | << FixItHint::CreateInsertion(KeywordLoc, "inline "); |
10905 | else |
10906 | S.Diag(Loc, diag::err_inline_namespace_mismatch); |
10907 | |
10908 | S.Diag(PrevNS->getLocation(), diag::note_previous_definition); |
10909 | *IsInline = PrevNS->isInline(); |
10910 | } |
10911 | |
10912 | /// ActOnStartNamespaceDef - This is called at the start of a namespace |
10913 | /// definition. |
10914 | Decl *Sema::ActOnStartNamespaceDef( |
10915 | Scope *NamespcScope, SourceLocation InlineLoc, SourceLocation NamespaceLoc, |
10916 | SourceLocation IdentLoc, IdentifierInfo *II, SourceLocation LBrace, |
10917 | const ParsedAttributesView &AttrList, UsingDirectiveDecl *&UD) { |
10918 | SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; |
10919 | // For anonymous namespace, take the location of the left brace. |
10920 | SourceLocation Loc = II ? IdentLoc : LBrace; |
10921 | bool IsInline = InlineLoc.isValid(); |
10922 | bool IsInvalid = false; |
10923 | bool IsStd = false; |
10924 | bool AddToKnown = false; |
10925 | Scope *DeclRegionScope = NamespcScope->getParent(); |
10926 | |
10927 | NamespaceDecl *PrevNS = nullptr; |
10928 | if (II) { |
10929 | // C++ [namespace.def]p2: |
10930 | // The identifier in an original-namespace-definition shall not |
10931 | // have been previously defined in the declarative region in |
10932 | // which the original-namespace-definition appears. The |
10933 | // identifier in an original-namespace-definition is the name of |
10934 | // the namespace. Subsequently in that declarative region, it is |
10935 | // treated as an original-namespace-name. |
10936 | // |
10937 | // Since namespace names are unique in their scope, and we don't |
10938 | // look through using directives, just look for any ordinary names |
10939 | // as if by qualified name lookup. |
10940 | LookupResult R(*this, II, IdentLoc, LookupOrdinaryName, |
10941 | ForExternalRedeclaration); |
10942 | LookupQualifiedName(R, CurContext->getRedeclContext()); |
10943 | NamedDecl *PrevDecl = |
10944 | R.isSingleResult() ? R.getRepresentativeDecl() : nullptr; |
10945 | PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); |
10946 | |
10947 | if (PrevNS) { |
10948 | // This is an extended namespace definition. |
10949 | if (IsInline != PrevNS->isInline()) |
10950 | DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II, |
10951 | &IsInline, PrevNS); |
10952 | } else if (PrevDecl) { |
10953 | // This is an invalid name redefinition. |
10954 | Diag(Loc, diag::err_redefinition_different_kind) |
10955 | << II; |
10956 | Diag(PrevDecl->getLocation(), diag::note_previous_definition); |
10957 | IsInvalid = true; |
10958 | // Continue on to push Namespc as current DeclContext and return it. |
10959 | } else if (II->isStr("std") && |
10960 | CurContext->getRedeclContext()->isTranslationUnit()) { |
10961 | // This is the first "real" definition of the namespace "std", so update |
10962 | // our cache of the "std" namespace to point at this definition. |
10963 | PrevNS = getStdNamespace(); |
10964 | IsStd = true; |
10965 | AddToKnown = !IsInline; |
10966 | } else { |
10967 | // We've seen this namespace for the first time. |
10968 | AddToKnown = !IsInline; |
10969 | } |
10970 | } else { |
10971 | // Anonymous namespaces. |
10972 | |
10973 | // Determine whether the parent already has an anonymous namespace. |
10974 | DeclContext *Parent = CurContext->getRedeclContext(); |
10975 | if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { |
10976 | PrevNS = TU->getAnonymousNamespace(); |
10977 | } else { |
10978 | NamespaceDecl *ND = cast<NamespaceDecl>(Parent); |
10979 | PrevNS = ND->getAnonymousNamespace(); |
10980 | } |
10981 | |
10982 | if (PrevNS && IsInline != PrevNS->isInline()) |
10983 | DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II, |
10984 | &IsInline, PrevNS); |
10985 | } |
10986 | |
10987 | NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, |
10988 | StartLoc, Loc, II, PrevNS); |
10989 | if (IsInvalid) |
10990 | Namespc->setInvalidDecl(); |
10991 | |
10992 | ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); |
10993 | AddPragmaAttributes(DeclRegionScope, Namespc); |
10994 | |
10995 | // FIXME: Should we be merging attributes? |
10996 | if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) |
10997 | PushNamespaceVisibilityAttr(Attr, Loc); |
10998 | |
10999 | if (IsStd) |
11000 | StdNamespace = Namespc; |
11001 | if (AddToKnown) |
11002 | KnownNamespaces[Namespc] = false; |
11003 | |
11004 | if (II) { |
11005 | PushOnScopeChains(Namespc, DeclRegionScope); |
11006 | } else { |
11007 | // Link the anonymous namespace into its parent. |
11008 | DeclContext *Parent = CurContext->getRedeclContext(); |
11009 | if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { |
11010 | TU->setAnonymousNamespace(Namespc); |
11011 | } else { |
11012 | cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); |
11013 | } |
11014 | |
11015 | CurContext->addDecl(Namespc); |
11016 | |
11017 | // C++ [namespace.unnamed]p1. An unnamed-namespace-definition |
11018 | // behaves as if it were replaced by |
11019 | // namespace unique { /* empty body */ } |
11020 | // using namespace unique; |
11021 | // namespace unique { namespace-body } |
11022 | // where all occurrences of 'unique' in a translation unit are |
11023 | // replaced by the same identifier and this identifier differs |
11024 | // from all other identifiers in the entire program. |
11025 | |
11026 | // We just create the namespace with an empty name and then add an |
11027 | // implicit using declaration, just like the standard suggests. |
11028 | // |
11029 | // CodeGen enforces the "universally unique" aspect by giving all |
11030 | // declarations semantically contained within an anonymous |
11031 | // namespace internal linkage. |
11032 | |
11033 | if (!PrevNS) { |
11034 | UD = UsingDirectiveDecl::Create(Context, Parent, |
11035 | /* 'using' */ LBrace, |
11036 | /* 'namespace' */ SourceLocation(), |
11037 | /* qualifier */ NestedNameSpecifierLoc(), |
11038 | /* identifier */ SourceLocation(), |
11039 | Namespc, |
11040 | /* Ancestor */ Parent); |
11041 | UD->setImplicit(); |
11042 | Parent->addDecl(UD); |
11043 | } |
11044 | } |
11045 | |
11046 | ActOnDocumentableDecl(Namespc); |
11047 | |
11048 | // Although we could have an invalid decl (i.e. the namespace name is a |
11049 | // redefinition), push it as current DeclContext and try to continue parsing. |
11050 | // FIXME: We should be able to push Namespc here, so that the each DeclContext |
11051 | // for the namespace has the declarations that showed up in that particular |
11052 | // namespace definition. |
11053 | PushDeclContext(NamespcScope, Namespc); |
11054 | return Namespc; |
11055 | } |
11056 | |
11057 | /// getNamespaceDecl - Returns the namespace a decl represents. If the decl |
11058 | /// is a namespace alias, returns the namespace it points to. |
11059 | static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { |
11060 | if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) |
11061 | return AD->getNamespace(); |
11062 | return dyn_cast_or_null<NamespaceDecl>(D); |
11063 | } |
11064 | |
11065 | /// ActOnFinishNamespaceDef - This callback is called after a namespace is |
11066 | /// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. |
11067 | void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { |
11068 | NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); |
11069 | assert(Namespc && "Invalid parameter, expected NamespaceDecl")((void)0); |
11070 | Namespc->setRBraceLoc(RBrace); |
11071 | PopDeclContext(); |
11072 | if (Namespc->hasAttr<VisibilityAttr>()) |
11073 | PopPragmaVisibility(true, RBrace); |
11074 | // If this namespace contains an export-declaration, export it now. |
11075 | if (DeferredExportedNamespaces.erase(Namespc)) |
11076 | Dcl->setModuleOwnershipKind(Decl::ModuleOwnershipKind::VisibleWhenImported); |
11077 | } |
11078 | |
11079 | CXXRecordDecl *Sema::getStdBadAlloc() const { |
11080 | return cast_or_null<CXXRecordDecl>( |
11081 | StdBadAlloc.get(Context.getExternalSource())); |
11082 | } |
11083 | |
11084 | EnumDecl *Sema::getStdAlignValT() const { |
11085 | return cast_or_null<EnumDecl>(StdAlignValT.get(Context.getExternalSource())); |
11086 | } |
11087 | |
11088 | NamespaceDecl *Sema::getStdNamespace() const { |
11089 | return cast_or_null<NamespaceDecl>( |
11090 | StdNamespace.get(Context.getExternalSource())); |
11091 | } |
11092 | |
11093 | NamespaceDecl *Sema::lookupStdExperimentalNamespace() { |
11094 | if (!StdExperimentalNamespaceCache) { |
11095 | if (auto Std = getStdNamespace()) { |
11096 | LookupResult Result(*this, &PP.getIdentifierTable().get("experimental"), |
11097 | SourceLocation(), LookupNamespaceName); |
11098 | if (!LookupQualifiedName(Result, Std) || |
11099 | !(StdExperimentalNamespaceCache = |
11100 | Result.getAsSingle<NamespaceDecl>())) |
11101 | Result.suppressDiagnostics(); |
11102 | } |
11103 | } |
11104 | return StdExperimentalNamespaceCache; |
11105 | } |
11106 | |
11107 | namespace { |
11108 | |
11109 | enum UnsupportedSTLSelect { |
11110 | USS_InvalidMember, |
11111 | USS_MissingMember, |
11112 | USS_NonTrivial, |
11113 | USS_Other |
11114 | }; |
11115 | |
11116 | struct InvalidSTLDiagnoser { |
11117 | Sema &S; |
11118 | SourceLocation Loc; |
11119 | QualType TyForDiags; |
11120 | |
11121 | QualType operator()(UnsupportedSTLSelect Sel = USS_Other, StringRef Name = "", |
11122 | const VarDecl *VD = nullptr) { |
11123 | { |
11124 | auto D = S.Diag(Loc, diag::err_std_compare_type_not_supported) |
11125 | << TyForDiags << ((int)Sel); |
11126 | if (Sel == USS_InvalidMember || Sel == USS_MissingMember) { |
11127 | assert(!Name.empty())((void)0); |
11128 | D << Name; |
11129 | } |
11130 | } |
11131 | if (Sel == USS_InvalidMember) { |
11132 | S.Diag(VD->getLocation(), diag::note_var_declared_here) |
11133 | << VD << VD->getSourceRange(); |
11134 | } |
11135 | return QualType(); |
11136 | } |
11137 | }; |
11138 | } // namespace |
11139 | |
11140 | QualType Sema::CheckComparisonCategoryType(ComparisonCategoryType Kind, |
11141 | SourceLocation Loc, |
11142 | ComparisonCategoryUsage Usage) { |
11143 | assert(getLangOpts().CPlusPlus &&((void)0) |
11144 | "Looking for comparison category type outside of C++.")((void)0); |
11145 | |
11146 | // Use an elaborated type for diagnostics which has a name containing the |
11147 | // prepended 'std' namespace but not any inline namespace names. |
11148 | auto TyForDiags = [&](ComparisonCategoryInfo *Info) { |
11149 | auto *NNS = |
11150 | NestedNameSpecifier::Create(Context, nullptr, getStdNamespace()); |
11151 | return Context.getElaboratedType(ETK_None, NNS, Info->getType()); |
11152 | }; |
11153 | |
11154 | // Check if we've already successfully checked the comparison category type |
11155 | // before. If so, skip checking it again. |
11156 | ComparisonCategoryInfo *Info = Context.CompCategories.lookupInfo(Kind); |
11157 | if (Info && FullyCheckedComparisonCategories[static_cast<unsigned>(Kind)]) { |
11158 | // The only thing we need to check is that the type has a reachable |
11159 | // definition in the current context. |
11160 | if (RequireCompleteType(Loc, TyForDiags(Info), diag::err_incomplete_type)) |
11161 | return QualType(); |
11162 | |
11163 | return Info->getType(); |
11164 | } |
11165 | |
11166 | // If lookup failed |
11167 | if (!Info) { |
11168 | std::string NameForDiags = "std::"; |
11169 | NameForDiags += ComparisonCategories::getCategoryString(Kind); |
11170 | Diag(Loc, diag::err_implied_comparison_category_type_not_found) |
11171 | << NameForDiags << (int)Usage; |
11172 | return QualType(); |
11173 | } |
11174 | |
11175 | assert(Info->Kind == Kind)((void)0); |
11176 | assert(Info->Record)((void)0); |
11177 | |
11178 | // Update the Record decl in case we encountered a forward declaration on our |
11179 | // first pass. FIXME: This is a bit of a hack. |
11180 | if (Info->Record->hasDefinition()) |
11181 | Info->Record = Info->Record->getDefinition(); |
11182 | |
11183 | if (RequireCompleteType(Loc, TyForDiags(Info), diag::err_incomplete_type)) |
11184 | return QualType(); |
11185 | |
11186 | InvalidSTLDiagnoser UnsupportedSTLError{*this, Loc, TyForDiags(Info)}; |
11187 | |
11188 | if (!Info->Record->isTriviallyCopyable()) |
11189 | return UnsupportedSTLError(USS_NonTrivial); |
11190 | |
11191 | for (const CXXBaseSpecifier &BaseSpec : Info->Record->bases()) { |
11192 | CXXRecordDecl *Base = BaseSpec.getType()->getAsCXXRecordDecl(); |
11193 | // Tolerate empty base classes. |
11194 | if (Base->isEmpty()) |
11195 | continue; |
11196 | // Reject STL implementations which have at least one non-empty base. |
11197 | return UnsupportedSTLError(); |
11198 | } |
11199 | |
11200 | // Check that the STL has implemented the types using a single integer field. |
11201 | // This expectation allows better codegen for builtin operators. We require: |
11202 | // (1) The class has exactly one field. |
11203 | // (2) The field is an integral or enumeration type. |
11204 | auto FIt = Info->Record->field_begin(), FEnd = Info->Record->field_end(); |
11205 | if (std::distance(FIt, FEnd) != 1 || |
11206 | !FIt->getType()->isIntegralOrEnumerationType()) { |
11207 | return UnsupportedSTLError(); |
11208 | } |
11209 | |
11210 | // Build each of the require values and store them in Info. |
11211 | for (ComparisonCategoryResult CCR : |
11212 | ComparisonCategories::getPossibleResultsForType(Kind)) { |
11213 | StringRef MemName = ComparisonCategories::getResultString(CCR); |
11214 | ComparisonCategoryInfo::ValueInfo *ValInfo = Info->lookupValueInfo(CCR); |
11215 | |
11216 | if (!ValInfo) |
11217 | return UnsupportedSTLError(USS_MissingMember, MemName); |
11218 | |
11219 | VarDecl *VD = ValInfo->VD; |
11220 | assert(VD && "should not be null!")((void)0); |
11221 | |
11222 | // Attempt to diagnose reasons why the STL definition of this type |
11223 | // might be foobar, including it failing to be a constant expression. |
11224 | // TODO Handle more ways the lookup or result can be invalid. |
11225 | if (!VD->isStaticDataMember() || |
11226 | !VD->isUsableInConstantExpressions(Context)) |
11227 | return UnsupportedSTLError(USS_InvalidMember, MemName, VD); |
11228 | |
11229 | // Attempt to evaluate the var decl as a constant expression and extract |
11230 | // the value of its first field as a ICE. If this fails, the STL |
11231 | // implementation is not supported. |
11232 | if (!ValInfo->hasValidIntValue()) |
11233 | return UnsupportedSTLError(); |
11234 | |
11235 | MarkVariableReferenced(Loc, VD); |
11236 | } |
11237 | |
11238 | // We've successfully built the required types and expressions. Update |
11239 | // the cache and return the newly cached value. |
11240 | FullyCheckedComparisonCategories[static_cast<unsigned>(Kind)] = true; |
11241 | return Info->getType(); |
11242 | } |
11243 | |
11244 | /// Retrieve the special "std" namespace, which may require us to |
11245 | /// implicitly define the namespace. |
11246 | NamespaceDecl *Sema::getOrCreateStdNamespace() { |
11247 | if (!StdNamespace) { |
11248 | // The "std" namespace has not yet been defined, so build one implicitly. |
11249 | StdNamespace = NamespaceDecl::Create(Context, |
11250 | Context.getTranslationUnitDecl(), |
11251 | /*Inline=*/false, |
11252 | SourceLocation(), SourceLocation(), |
11253 | &PP.getIdentifierTable().get("std"), |
11254 | /*PrevDecl=*/nullptr); |
11255 | getStdNamespace()->setImplicit(true); |
11256 | } |
11257 | |
11258 | return getStdNamespace(); |
11259 | } |
11260 | |
11261 | bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { |
11262 | assert(getLangOpts().CPlusPlus &&((void)0) |
11263 | "Looking for std::initializer_list outside of C++.")((void)0); |
11264 | |
11265 | // We're looking for implicit instantiations of |
11266 | // template <typename E> class std::initializer_list. |
11267 | |
11268 | if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. |
11269 | return false; |
11270 | |
11271 | ClassTemplateDecl *Template = nullptr; |
11272 | const TemplateArgument *Arguments = nullptr; |
11273 | |
11274 | if (const RecordType *RT = Ty->getAs<RecordType>()) { |
11275 | |
11276 | ClassTemplateSpecializationDecl *Specialization = |
11277 | dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); |
11278 | if (!Specialization) |
11279 | return false; |
11280 | |
11281 | Template = Specialization->getSpecializedTemplate(); |
11282 | Arguments = Specialization->getTemplateArgs().data(); |
11283 | } else if (const TemplateSpecializationType *TST = |
11284 | Ty->getAs<TemplateSpecializationType>()) { |
11285 | Template = dyn_cast_or_null<ClassTemplateDecl>( |
11286 | TST->getTemplateName().getAsTemplateDecl()); |
11287 | Arguments = TST->getArgs(); |
11288 | } |
11289 | if (!Template) |
11290 | return false; |
11291 | |
11292 | if (!StdInitializerList) { |
11293 | // Haven't recognized std::initializer_list yet, maybe this is it. |
11294 | CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); |
11295 | if (TemplateClass->getIdentifier() != |
11296 | &PP.getIdentifierTable().get("initializer_list") || |
11297 | !getStdNamespace()->InEnclosingNamespaceSetOf( |
11298 | TemplateClass->getDeclContext())) |
11299 | return false; |
11300 | // This is a template called std::initializer_list, but is it the right |
11301 | // template? |
11302 | TemplateParameterList *Params = Template->getTemplateParameters(); |
11303 | if (Params->getMinRequiredArguments() != 1) |
11304 | return false; |
11305 | if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) |
11306 | return false; |
11307 | |
11308 | // It's the right template. |
11309 | StdInitializerList = Template; |
11310 | } |
11311 | |
11312 | if (Template->getCanonicalDecl() != StdInitializerList->getCanonicalDecl()) |
11313 | return false; |
11314 | |
11315 | // This is an instance of std::initializer_list. Find the argument type. |
11316 | if (Element) |
11317 | *Element = Arguments[0].getAsType(); |
11318 | return true; |
11319 | } |
11320 | |
11321 | static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ |
11322 | NamespaceDecl *Std = S.getStdNamespace(); |
11323 | if (!Std) { |
11324 | S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); |
11325 | return nullptr; |
11326 | } |
11327 | |
11328 | LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), |
11329 | Loc, Sema::LookupOrdinaryName); |
11330 | if (!S.LookupQualifiedName(Result, Std)) { |
11331 | S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); |
11332 | return nullptr; |
11333 | } |
11334 | ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); |
11335 | if (!Template) { |
11336 | Result.suppressDiagnostics(); |
11337 | // We found something weird. Complain about the first thing we found. |
11338 | NamedDecl *Found = *Result.begin(); |
11339 | S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); |
11340 | return nullptr; |
11341 | } |
11342 | |
11343 | // We found some template called std::initializer_list. Now verify that it's |
11344 | // correct. |
11345 | TemplateParameterList *Params = Template->getTemplateParameters(); |
11346 | if (Params->getMinRequiredArguments() != 1 || |
11347 | !isa<TemplateTypeParmDecl>(Params->getParam(0))) { |
11348 | S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); |
11349 | return nullptr; |
11350 | } |
11351 | |
11352 | return Template; |
11353 | } |
11354 | |
11355 | QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { |
11356 | if (!StdInitializerList) { |
11357 | StdInitializerList = LookupStdInitializerList(*this, Loc); |
11358 | if (!StdInitializerList) |
11359 | return QualType(); |
11360 | } |
11361 | |
11362 | TemplateArgumentListInfo Args(Loc, Loc); |
11363 | Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), |
11364 | Context.getTrivialTypeSourceInfo(Element, |
11365 | Loc))); |
11366 | return Context.getCanonicalType( |
11367 | CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); |
11368 | } |
11369 | |
11370 | bool Sema::isInitListConstructor(const FunctionDecl *Ctor) { |
11371 | // C++ [dcl.init.list]p2: |
11372 | // A constructor is an initializer-list constructor if its first parameter |
11373 | // is of type std::initializer_list<E> or reference to possibly cv-qualified |
11374 | // std::initializer_list<E> for some type E, and either there are no other |
11375 | // parameters or else all other parameters have default arguments. |
11376 | if (!Ctor->hasOneParamOrDefaultArgs()) |
11377 | return false; |
11378 | |
11379 | QualType ArgType = Ctor->getParamDecl(0)->getType(); |
11380 | if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) |
11381 | ArgType = RT->getPointeeType().getUnqualifiedType(); |
11382 | |
11383 | return isStdInitializerList(ArgType, nullptr); |
11384 | } |
11385 | |
11386 | /// Determine whether a using statement is in a context where it will be |
11387 | /// apply in all contexts. |
11388 | static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { |
11389 | switch (CurContext->getDeclKind()) { |
11390 | case Decl::TranslationUnit: |
11391 | return true; |
11392 | case Decl::LinkageSpec: |
11393 | return IsUsingDirectiveInToplevelContext(CurContext->getParent()); |
11394 | default: |
11395 | return false; |
11396 | } |
11397 | } |
11398 | |
11399 | namespace { |
11400 | |
11401 | // Callback to only accept typo corrections that are namespaces. |
11402 | class NamespaceValidatorCCC final : public CorrectionCandidateCallback { |
11403 | public: |
11404 | bool ValidateCandidate(const TypoCorrection &candidate) override { |
11405 | if (NamedDecl *ND = candidate.getCorrectionDecl()) |
11406 | return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); |
11407 | return false; |
11408 | } |
11409 | |
11410 | std::unique_ptr<CorrectionCandidateCallback> clone() override { |
11411 | return std::make_unique<NamespaceValidatorCCC>(*this); |
11412 | } |
11413 | }; |
11414 | |
11415 | } |
11416 | |
11417 | static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, |
11418 | CXXScopeSpec &SS, |
11419 | SourceLocation IdentLoc, |
11420 | IdentifierInfo *Ident) { |
11421 | R.clear(); |
11422 | NamespaceValidatorCCC CCC{}; |
11423 | if (TypoCorrection Corrected = |
11424 | S.CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), Sc, &SS, CCC, |
11425 | Sema::CTK_ErrorRecovery)) { |
11426 | if (DeclContext *DC = S.computeDeclContext(SS, false)) { |
11427 | std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); |
11428 | bool DroppedSpecifier = Corrected.WillReplaceSpecifier() && |
11429 | Ident->getName().equals(CorrectedStr); |
11430 | S.diagnoseTypo(Corrected, |
11431 | S.PDiag(diag::err_using_directive_member_suggest) |
11432 | << Ident << DC << DroppedSpecifier << SS.getRange(), |
11433 | S.PDiag(diag::note_namespace_defined_here)); |
11434 | } else { |
11435 | S.diagnoseTypo(Corrected, |
11436 | S.PDiag(diag::err_using_directive_suggest) << Ident, |
11437 | S.PDiag(diag::note_namespace_defined_here)); |
11438 | } |
11439 | R.addDecl(Corrected.getFoundDecl()); |
11440 | return true; |
11441 | } |
11442 | return false; |
11443 | } |
11444 | |
11445 | Decl *Sema::ActOnUsingDirective(Scope *S, SourceLocation UsingLoc, |
11446 | SourceLocation NamespcLoc, CXXScopeSpec &SS, |
11447 | SourceLocation IdentLoc, |
11448 | IdentifierInfo *NamespcName, |
11449 | const ParsedAttributesView &AttrList) { |
11450 | assert(!SS.isInvalid() && "Invalid CXXScopeSpec.")((void)0); |
11451 | assert(NamespcName && "Invalid NamespcName.")((void)0); |
11452 | assert(IdentLoc.isValid() && "Invalid NamespceName location.")((void)0); |
11453 | |
11454 | // This can only happen along a recovery path. |
11455 | while (S->isTemplateParamScope()) |
11456 | S = S->getParent(); |
11457 | assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.")((void)0); |
11458 | |
11459 | UsingDirectiveDecl *UDir = nullptr; |
11460 | NestedNameSpecifier *Qualifier = nullptr; |
11461 | if (SS.isSet()) |
11462 | Qualifier = SS.getScopeRep(); |
11463 | |
11464 | // Lookup namespace name. |
11465 | LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); |
11466 | LookupParsedName(R, S, &SS); |
11467 | if (R.isAmbiguous()) |
11468 | return nullptr; |
11469 | |
11470 | if (R.empty()) { |
11471 | R.clear(); |
11472 | // Allow "using namespace std;" or "using namespace ::std;" even if |
11473 | // "std" hasn't been defined yet, for GCC compatibility. |
11474 | if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && |
11475 | NamespcName->isStr("std")) { |
11476 | Diag(IdentLoc, diag::ext_using_undefined_std); |
11477 | R.addDecl(getOrCreateStdNamespace()); |
11478 | R.resolveKind(); |
11479 | } |
11480 | // Otherwise, attempt typo correction. |
11481 | else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); |
11482 | } |
11483 | |
11484 | if (!R.empty()) { |
11485 | NamedDecl *Named = R.getRepresentativeDecl(); |
11486 | NamespaceDecl *NS = R.getAsSingle<NamespaceDecl>(); |
11487 | assert(NS && "expected namespace decl")((void)0); |
11488 | |
11489 | // The use of a nested name specifier may trigger deprecation warnings. |
11490 | DiagnoseUseOfDecl(Named, IdentLoc); |
11491 | |
11492 | // C++ [namespace.udir]p1: |
11493 | // A using-directive specifies that the names in the nominated |
11494 | // namespace can be used in the scope in which the |
11495 | // using-directive appears after the using-directive. During |
11496 | // unqualified name lookup (3.4.1), the names appear as if they |
11497 | // were declared in the nearest enclosing namespace which |
11498 | // contains both the using-directive and the nominated |
11499 | // namespace. [Note: in this context, "contains" means "contains |
11500 | // directly or indirectly". ] |
11501 | |
11502 | // Find enclosing context containing both using-directive and |
11503 | // nominated namespace. |
11504 | DeclContext *CommonAncestor = NS; |
11505 | while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) |
11506 | CommonAncestor = CommonAncestor->getParent(); |
11507 | |
11508 | UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, |
11509 | SS.getWithLocInContext(Context), |
11510 | IdentLoc, Named, CommonAncestor); |
11511 | |
11512 | if (IsUsingDirectiveInToplevelContext(CurContext) && |
11513 | !SourceMgr.isInMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { |
11514 | Diag(IdentLoc, diag::warn_using_directive_in_header); |
11515 | } |
11516 | |
11517 | PushUsingDirective(S, UDir); |
11518 | } else { |
11519 | Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); |
11520 | } |
11521 | |
11522 | if (UDir) |
11523 | ProcessDeclAttributeList(S, UDir, AttrList); |
11524 | |
11525 | return UDir; |
11526 | } |
11527 | |
11528 | void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { |
11529 | // If the scope has an associated entity and the using directive is at |
11530 | // namespace or translation unit scope, add the UsingDirectiveDecl into |
11531 | // its lookup structure so qualified name lookup can find it. |
11532 | DeclContext *Ctx = S->getEntity(); |
11533 | if (Ctx && !Ctx->isFunctionOrMethod()) |
11534 | Ctx->addDecl(UDir); |
11535 | else |
11536 | // Otherwise, it is at block scope. The using-directives will affect lookup |
11537 | // only to the end of the scope. |
11538 | S->PushUsingDirective(UDir); |
11539 | } |
11540 | |
11541 | Decl *Sema::ActOnUsingDeclaration(Scope *S, AccessSpecifier AS, |
11542 | SourceLocation UsingLoc, |
11543 | SourceLocation TypenameLoc, CXXScopeSpec &SS, |
11544 | UnqualifiedId &Name, |
11545 | SourceLocation EllipsisLoc, |
11546 | const ParsedAttributesView &AttrList) { |
11547 | assert(S->getFlags() & Scope::DeclScope && "Invalid Scope.")((void)0); |
11548 | |
11549 | if (SS.isEmpty()) { |
11550 | Diag(Name.getBeginLoc(), diag::err_using_requires_qualname); |
11551 | return nullptr; |
11552 | } |
11553 | |
11554 | switch (Name.getKind()) { |
11555 | case UnqualifiedIdKind::IK_ImplicitSelfParam: |
11556 | case UnqualifiedIdKind::IK_Identifier: |
11557 | case UnqualifiedIdKind::IK_OperatorFunctionId: |
11558 | case UnqualifiedIdKind::IK_LiteralOperatorId: |
11559 | case UnqualifiedIdKind::IK_ConversionFunctionId: |
11560 | break; |
11561 | |
11562 | case UnqualifiedIdKind::IK_ConstructorName: |
11563 | case UnqualifiedIdKind::IK_ConstructorTemplateId: |
11564 | // C++11 inheriting constructors. |
11565 | Diag(Name.getBeginLoc(), |
11566 | getLangOpts().CPlusPlus11 |
11567 | ? diag::warn_cxx98_compat_using_decl_constructor |
11568 | : diag::err_using_decl_constructor) |
11569 | << SS.getRange(); |
11570 | |
11571 | if (getLangOpts().CPlusPlus11) break; |
11572 | |
11573 | return nullptr; |
11574 | |
11575 | case UnqualifiedIdKind::IK_DestructorName: |
11576 | Diag(Name.getBeginLoc(), diag::err_using_decl_destructor) << SS.getRange(); |
11577 | return nullptr; |
11578 | |
11579 | case UnqualifiedIdKind::IK_TemplateId: |
11580 | Diag(Name.getBeginLoc(), diag::err_using_decl_template_id) |
11581 | << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); |
11582 | return nullptr; |
11583 | |
11584 | case UnqualifiedIdKind::IK_DeductionGuideName: |
11585 | llvm_unreachable("cannot parse qualified deduction guide name")__builtin_unreachable(); |
11586 | } |
11587 | |
11588 | DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); |
11589 | DeclarationName TargetName = TargetNameInfo.getName(); |
11590 | if (!TargetName) |
11591 | return nullptr; |
11592 | |
11593 | // Warn about access declarations. |
11594 | if (UsingLoc.isInvalid()) { |
11595 | Diag(Name.getBeginLoc(), getLangOpts().CPlusPlus11 |
11596 | ? diag::err_access_decl |
11597 | : diag::warn_access_decl_deprecated) |
11598 | << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); |
11599 | } |
11600 | |
11601 | if (EllipsisLoc.isInvalid()) { |
11602 | if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || |
11603 | DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) |
11604 | return nullptr; |
11605 | } else { |
11606 | if (!SS.getScopeRep()->containsUnexpandedParameterPack() && |
11607 | !TargetNameInfo.containsUnexpandedParameterPack()) { |
11608 | Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) |
11609 | << SourceRange(SS.getBeginLoc(), TargetNameInfo.getEndLoc()); |
11610 | EllipsisLoc = SourceLocation(); |
11611 | } |
11612 | } |
11613 | |
11614 | NamedDecl *UD = |
11615 | BuildUsingDeclaration(S, AS, UsingLoc, TypenameLoc.isValid(), TypenameLoc, |
11616 | SS, TargetNameInfo, EllipsisLoc, AttrList, |
11617 | /*IsInstantiation*/ false, |
11618 | AttrList.hasAttribute(ParsedAttr::AT_UsingIfExists)); |
11619 | if (UD) |
11620 | PushOnScopeChains(UD, S, /*AddToContext*/ false); |
11621 | |
11622 | return UD; |
11623 | } |
11624 | |
11625 | Decl *Sema::ActOnUsingEnumDeclaration(Scope *S, AccessSpecifier AS, |
11626 | SourceLocation UsingLoc, |
11627 | SourceLocation EnumLoc, |
11628 | const DeclSpec &DS) { |
11629 | switch (DS.getTypeSpecType()) { |
11630 | case DeclSpec::TST_error: |
11631 | // This will already have been diagnosed |
11632 | return nullptr; |
11633 | |
11634 | case DeclSpec::TST_enum: |
11635 | break; |
11636 | |
11637 | case DeclSpec::TST_typename: |
11638 | Diag(DS.getTypeSpecTypeLoc(), diag::err_using_enum_is_dependent); |
11639 | return nullptr; |
11640 | |
11641 | default: |
11642 | llvm_unreachable("unexpected DeclSpec type")__builtin_unreachable(); |
11643 | } |
11644 | |
11645 | // As with enum-decls, we ignore attributes for now. |
11646 | auto *Enum = cast<EnumDecl>(DS.getRepAsDecl()); |
11647 | if (auto *Def = Enum->getDefinition()) |
11648 | Enum = Def; |
11649 | |
11650 | auto *UD = BuildUsingEnumDeclaration(S, AS, UsingLoc, EnumLoc, |
11651 | DS.getTypeSpecTypeNameLoc(), Enum); |
11652 | if (UD) |
11653 | PushOnScopeChains(UD, S, /*AddToContext*/ false); |
11654 | |
11655 | return UD; |
11656 | } |
11657 | |
11658 | /// Determine whether a using declaration considers the given |
11659 | /// declarations as "equivalent", e.g., if they are redeclarations of |
11660 | /// the same entity or are both typedefs of the same type. |
11661 | static bool |
11662 | IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2) { |
11663 | if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) |
11664 | return true; |
11665 | |
11666 | if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) |
11667 | if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) |
11668 | return Context.hasSameType(TD1->getUnderlyingType(), |
11669 | TD2->getUnderlyingType()); |
11670 | |
11671 | // Two using_if_exists using-declarations are equivalent if both are |
11672 | // unresolved. |
11673 | if (isa<UnresolvedUsingIfExistsDecl>(D1) && |
11674 | isa<UnresolvedUsingIfExistsDecl>(D2)) |
11675 | return true; |
11676 | |
11677 | return false; |
11678 | } |
11679 | |
11680 | |
11681 | /// Determines whether to create a using shadow decl for a particular |
11682 | /// decl, given the set of decls existing prior to this using lookup. |
11683 | bool Sema::CheckUsingShadowDecl(BaseUsingDecl *BUD, NamedDecl *Orig, |
11684 | const LookupResult &Previous, |
11685 | UsingShadowDecl *&PrevShadow) { |
11686 | // Diagnose finding a decl which is not from a base class of the |
11687 | // current class. We do this now because there are cases where this |
11688 | // function will silently decide not to build a shadow decl, which |
11689 | // will pre-empt further diagnostics. |
11690 | // |
11691 | // We don't need to do this in C++11 because we do the check once on |
11692 | // the qualifier. |
11693 | // |
11694 | // FIXME: diagnose the following if we care enough: |
11695 | // struct A { int foo; }; |
11696 | // struct B : A { using A::foo; }; |
11697 | // template <class T> struct C : A {}; |
11698 | // template <class T> struct D : C<T> { using B::foo; } // <--- |
11699 | // This is invalid (during instantiation) in C++03 because B::foo |
11700 | // resolves to the using decl in B, which is not a base class of D<T>. |
11701 | // We can't diagnose it immediately because C<T> is an unknown |
11702 | // specialization. The UsingShadowDecl in D<T> then points directly |
11703 | // to A::foo, which will look well-formed when we instantiate. |
11704 | // The right solution is to not collapse the shadow-decl chain. |
11705 | if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) |
11706 | if (auto *Using = dyn_cast<UsingDecl>(BUD)) { |
11707 | DeclContext *OrigDC = Orig->getDeclContext(); |
11708 | |
11709 | // Handle enums and anonymous structs. |
11710 | if (isa<EnumDecl>(OrigDC)) |
11711 | OrigDC = OrigDC->getParent(); |
11712 | CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); |
11713 | while (OrigRec->isAnonymousStructOrUnion()) |
11714 | OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); |
11715 | |
11716 | if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { |
11717 | if (OrigDC == CurContext) { |
11718 | Diag(Using->getLocation(), |
11719 | diag::err_using_decl_nested_name_specifier_is_current_class) |
11720 | << Using->getQualifierLoc().getSourceRange(); |
11721 | Diag(Orig->getLocation(), diag::note_using_decl_target); |
11722 | Using->setInvalidDecl(); |
11723 | return true; |
11724 | } |
11725 | |
11726 | Diag(Using->getQualifierLoc().getBeginLoc(), |
11727 | diag::err_using_decl_nested_name_specifier_is_not_base_class) |
11728 | << Using->getQualifier() << cast<CXXRecordDecl>(CurContext) |
11729 | << Using->getQualifierLoc().getSourceRange(); |
11730 | Diag(Orig->getLocation(), diag::note_using_decl_target); |
11731 | Using->setInvalidDecl(); |
11732 | return true; |
11733 | } |
11734 | } |
11735 | |
11736 | if (Previous.empty()) return false; |
11737 | |
11738 | NamedDecl *Target = Orig; |
11739 | if (isa<UsingShadowDecl>(Target)) |
11740 | Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); |
11741 | |
11742 | // If the target happens to be one of the previous declarations, we |
11743 | // don't have a conflict. |
11744 | // |
11745 | // FIXME: but we might be increasing its access, in which case we |
11746 | // should redeclare it. |
11747 | NamedDecl *NonTag = nullptr, *Tag = nullptr; |
11748 | bool FoundEquivalentDecl = false; |
11749 | for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); |
11750 | I != E; ++I) { |
11751 | NamedDecl *D = (*I)->getUnderlyingDecl(); |
11752 | // We can have UsingDecls in our Previous results because we use the same |
11753 | // LookupResult for checking whether the UsingDecl itself is a valid |
11754 | // redeclaration. |
11755 | if (isa<UsingDecl>(D) || isa<UsingPackDecl>(D) || isa<UsingEnumDecl>(D)) |
11756 | continue; |
11757 | |
11758 | if (auto *RD = dyn_cast<CXXRecordDecl>(D)) { |
11759 | // C++ [class.mem]p19: |
11760 | // If T is the name of a class, then [every named member other than |
11761 | // a non-static data member] shall have a name different from T |
11762 | if (RD->isInjectedClassName() && !isa<FieldDecl>(Target) && |
11763 | !isa<IndirectFieldDecl>(Target) && |
11764 | !isa<UnresolvedUsingValueDecl>(Target) && |
11765 | DiagnoseClassNameShadow( |
11766 | CurContext, |
11767 | DeclarationNameInfo(BUD->getDeclName(), BUD->getLocation()))) |
11768 | return true; |
11769 | } |
11770 | |
11771 | if (IsEquivalentForUsingDecl(Context, D, Target)) { |
11772 | if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(*I)) |
11773 | PrevShadow = Shadow; |
11774 | FoundEquivalentDecl = true; |
11775 | } else if (isEquivalentInternalLinkageDeclaration(D, Target)) { |
11776 | // We don't conflict with an existing using shadow decl of an equivalent |
11777 | // declaration, but we're not a redeclaration of it. |
11778 | FoundEquivalentDecl = true; |
11779 | } |
11780 | |
11781 | if (isVisible(D)) |
11782 | (isa<TagDecl>(D) ? Tag : NonTag) = D; |
11783 | } |
11784 | |
11785 | if (FoundEquivalentDecl) |
11786 | return false; |
11787 | |
11788 | // Always emit a diagnostic for a mismatch between an unresolved |
11789 | // using_if_exists and a resolved using declaration in either direction. |
11790 | if (isa<UnresolvedUsingIfExistsDecl>(Target) != |
11791 | (isa_and_nonnull<UnresolvedUsingIfExistsDecl>(NonTag))) { |
11792 | if (!NonTag && !Tag) |
11793 | return false; |
11794 | Diag(BUD->getLocation(), diag::err_using_decl_conflict); |
11795 | Diag(Target->getLocation(), diag::note_using_decl_target); |
11796 | Diag((NonTag ? NonTag : Tag)->getLocation(), |
11797 | diag::note_using_decl_conflict); |
11798 | BUD->setInvalidDecl(); |
11799 | return true; |
11800 | } |
11801 | |
11802 | if (FunctionDecl *FD = Target->getAsFunction()) { |
11803 | NamedDecl *OldDecl = nullptr; |
11804 | switch (CheckOverload(nullptr, FD, Previous, OldDecl, |
11805 | /*IsForUsingDecl*/ true)) { |
11806 | case Ovl_Overload: |
11807 | return false; |
11808 | |
11809 | case Ovl_NonFunction: |
11810 | Diag(BUD->getLocation(), diag::err_using_decl_conflict); |
11811 | break; |
11812 | |
11813 | // We found a decl with the exact signature. |
11814 | case Ovl_Match: |
11815 | // If we're in a record, we want to hide the target, so we |
11816 | // return true (without a diagnostic) to tell the caller not to |
11817 | // build a shadow decl. |
11818 | if (CurContext->isRecord()) |
11819 | return true; |
11820 | |
11821 | // If we're not in a record, this is an error. |
11822 | Diag(BUD->getLocation(), diag::err_using_decl_conflict); |
11823 | break; |
11824 | } |
11825 | |
11826 | Diag(Target->getLocation(), diag::note_using_decl_target); |
11827 | Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); |
11828 | BUD->setInvalidDecl(); |
11829 | return true; |
11830 | } |
11831 | |
11832 | // Target is not a function. |
11833 | |
11834 | if (isa<TagDecl>(Target)) { |
11835 | // No conflict between a tag and a non-tag. |
11836 | if (!Tag) return false; |
11837 | |
11838 | Diag(BUD->getLocation(), diag::err_using_decl_conflict); |
11839 | Diag(Target->getLocation(), diag::note_using_decl_target); |
11840 | Diag(Tag->getLocation(), diag::note_using_decl_conflict); |
11841 | BUD->setInvalidDecl(); |
11842 | return true; |
11843 | } |
11844 | |
11845 | // No conflict between a tag and a non-tag. |
11846 | if (!NonTag) return false; |
11847 | |
11848 | Diag(BUD->getLocation(), diag::err_using_decl_conflict); |
11849 | Diag(Target->getLocation(), diag::note_using_decl_target); |
11850 | Diag(NonTag->getLocation(), diag::note_using_decl_conflict); |
11851 | BUD->setInvalidDecl(); |
11852 | return true; |
11853 | } |
11854 | |
11855 | /// Determine whether a direct base class is a virtual base class. |
11856 | static bool isVirtualDirectBase(CXXRecordDecl *Derived, CXXRecordDecl *Base) { |
11857 | if (!Derived->getNumVBases()) |
11858 | return false; |
11859 | for (auto &B : Derived->bases()) |
11860 | if (B.getType()->getAsCXXRecordDecl() == Base) |
11861 | return B.isVirtual(); |
11862 | llvm_unreachable("not a direct base class")__builtin_unreachable(); |
11863 | } |
11864 | |
11865 | /// Builds a shadow declaration corresponding to a 'using' declaration. |
11866 | UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, BaseUsingDecl *BUD, |
11867 | NamedDecl *Orig, |
11868 | UsingShadowDecl *PrevDecl) { |
11869 | // If we resolved to another shadow declaration, just coalesce them. |
11870 | NamedDecl *Target = Orig; |
11871 | if (isa<UsingShadowDecl>(Target)) { |
11872 | Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); |
11873 | assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration")((void)0); |
11874 | } |
11875 | |
11876 | NamedDecl *NonTemplateTarget = Target; |
11877 | if (auto *TargetTD = dyn_cast<TemplateDecl>(Target)) |
11878 | NonTemplateTarget = TargetTD->getTemplatedDecl(); |
11879 | |
11880 | UsingShadowDecl *Shadow; |
11881 | if (NonTemplateTarget && isa<CXXConstructorDecl>(NonTemplateTarget)) { |
11882 | UsingDecl *Using = cast<UsingDecl>(BUD); |
11883 | bool IsVirtualBase = |
11884 | isVirtualDirectBase(cast<CXXRecordDecl>(CurContext), |
11885 | Using->getQualifier()->getAsRecordDecl()); |
11886 | Shadow = ConstructorUsingShadowDecl::Create( |
11887 | Context, CurContext, Using->getLocation(), Using, Orig, IsVirtualBase); |
11888 | } else { |
11889 | Shadow = UsingShadowDecl::Create(Context, CurContext, BUD->getLocation(), |
11890 | Target->getDeclName(), BUD, Target); |
11891 | } |
11892 | BUD->addShadowDecl(Shadow); |
11893 | |
11894 | Shadow->setAccess(BUD->getAccess()); |
11895 | if (Orig->isInvalidDecl() || BUD->isInvalidDecl()) |
11896 | Shadow->setInvalidDecl(); |
11897 | |
11898 | Shadow->setPreviousDecl(PrevDecl); |
11899 | |
11900 | if (S) |
11901 | PushOnScopeChains(Shadow, S); |
11902 | else |
11903 | CurContext->addDecl(Shadow); |
11904 | |
11905 | |
11906 | return Shadow; |
11907 | } |
11908 | |
11909 | /// Hides a using shadow declaration. This is required by the current |
11910 | /// using-decl implementation when a resolvable using declaration in a |
11911 | /// class is followed by a declaration which would hide or override |
11912 | /// one or more of the using decl's targets; for example: |
11913 | /// |
11914 | /// struct Base { void foo(int); }; |
11915 | /// struct Derived : Base { |
11916 | /// using Base::foo; |
11917 | /// void foo(int); |
11918 | /// }; |
11919 | /// |
11920 | /// The governing language is C++03 [namespace.udecl]p12: |
11921 | /// |
11922 | /// When a using-declaration brings names from a base class into a |
11923 | /// derived class scope, member functions in the derived class |
11924 | /// override and/or hide member functions with the same name and |
11925 | /// parameter types in a base class (rather than conflicting). |
11926 | /// |
11927 | /// There are two ways to implement this: |
11928 | /// (1) optimistically create shadow decls when they're not hidden |
11929 | /// by existing declarations, or |
11930 | /// (2) don't create any shadow decls (or at least don't make them |
11931 | /// visible) until we've fully parsed/instantiated the class. |
11932 | /// The problem with (1) is that we might have to retroactively remove |
11933 | /// a shadow decl, which requires several O(n) operations because the |
11934 | /// decl structures are (very reasonably) not designed for removal. |
11935 | /// (2) avoids this but is very fiddly and phase-dependent. |
11936 | void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { |
11937 | if (Shadow->getDeclName().getNameKind() == |
11938 | DeclarationName::CXXConversionFunctionName) |
11939 | cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); |
11940 | |
11941 | // Remove it from the DeclContext... |
11942 | Shadow->getDeclContext()->removeDecl(Shadow); |
11943 | |
11944 | // ...and the scope, if applicable... |
11945 | if (S) { |
11946 | S->RemoveDecl(Shadow); |
11947 | IdResolver.RemoveDecl(Shadow); |
11948 | } |
11949 | |
11950 | // ...and the using decl. |
11951 | Shadow->getIntroducer()->removeShadowDecl(Shadow); |
11952 | |
11953 | // TODO: complain somehow if Shadow was used. It shouldn't |
11954 | // be possible for this to happen, because...? |
11955 | } |
11956 | |
11957 | /// Find the base specifier for a base class with the given type. |
11958 | static CXXBaseSpecifier *findDirectBaseWithType(CXXRecordDecl *Derived, |
11959 | QualType DesiredBase, |
11960 | bool &AnyDependentBases) { |
11961 | // Check whether the named type is a direct base class. |
11962 | CanQualType CanonicalDesiredBase = DesiredBase->getCanonicalTypeUnqualified() |
11963 | .getUnqualifiedType(); |
11964 | for (auto &Base : Derived->bases()) { |
11965 | CanQualType BaseType = Base.getType()->getCanonicalTypeUnqualified(); |
11966 | if (CanonicalDesiredBase == BaseType) |
11967 | return &Base; |
11968 | if (BaseType->isDependentType()) |
11969 | AnyDependentBases = true; |
11970 | } |
11971 | return nullptr; |
11972 | } |
11973 | |
11974 | namespace { |
11975 | class UsingValidatorCCC final : public CorrectionCandidateCallback { |
11976 | public: |
11977 | UsingValidatorCCC(bool HasTypenameKeyword, bool IsInstantiation, |
11978 | NestedNameSpecifier *NNS, CXXRecordDecl *RequireMemberOf) |
11979 | : HasTypenameKeyword(HasTypenameKeyword), |
11980 | IsInstantiation(IsInstantiation), OldNNS(NNS), |
11981 | RequireMemberOf(RequireMemberOf) {} |
11982 | |
11983 | bool ValidateCandidate(const TypoCorrection &Candidate) override { |
11984 | NamedDecl *ND = Candidate.getCorrectionDecl(); |
11985 | |
11986 | // Keywords are not valid here. |
11987 | if (!ND || isa<NamespaceDecl>(ND)) |
11988 | return false; |
11989 | |
11990 | // Completely unqualified names are invalid for a 'using' declaration. |
11991 | if (Candidate.WillReplaceSpecifier() && !Candidate.getCorrectionSpecifier()) |
11992 | return false; |
11993 | |
11994 | // FIXME: Don't correct to a name that CheckUsingDeclRedeclaration would |
11995 | // reject. |
11996 | |
11997 | if (RequireMemberOf) { |
11998 | auto *FoundRecord = dyn_cast<CXXRecordDecl>(ND); |
11999 | if (FoundRecord && FoundRecord->isInjectedClassName()) { |
12000 | // No-one ever wants a using-declaration to name an injected-class-name |
12001 | // of a base class, unless they're declaring an inheriting constructor. |
12002 | ASTContext &Ctx = ND->getASTContext(); |
12003 | if (!Ctx.getLangOpts().CPlusPlus11) |
12004 | return false; |
12005 | QualType FoundType = Ctx.getRecordType(FoundRecord); |
12006 | |
12007 | // Check that the injected-class-name is named as a member of its own |
12008 | // type; we don't want to suggest 'using Derived::Base;', since that |
12009 | // means something else. |
12010 | NestedNameSpecifier *Specifier = |
12011 | Candidate.WillReplaceSpecifier() |
12012 | ? Candidate.getCorrectionSpecifier() |
12013 | : OldNNS; |
12014 | if (!Specifier->getAsType() || |
12015 | !Ctx.hasSameType(QualType(Specifier->getAsType(), 0), FoundType)) |
12016 | return false; |
12017 | |
12018 | // Check that this inheriting constructor declaration actually names a |
12019 | // direct base class of the current class. |
12020 | bool AnyDependentBases = false; |
12021 | if (!findDirectBaseWithType(RequireMemberOf, |
12022 | Ctx.getRecordType(FoundRecord), |
12023 | AnyDependentBases) && |
12024 | !AnyDependentBases) |
12025 | return false; |
12026 | } else { |
12027 | auto *RD = dyn_cast<CXXRecordDecl>(ND->getDeclContext()); |
12028 | if (!RD || RequireMemberOf->isProvablyNotDerivedFrom(RD)) |
12029 | return false; |
12030 | |
12031 | // FIXME: Check that the base class member is accessible? |
12032 | } |
12033 | } else { |
12034 | auto *FoundRecord = dyn_cast<CXXRecordDecl>(ND); |
12035 | if (FoundRecord && FoundRecord->isInjectedClassName()) |
12036 | return false; |
12037 | } |
12038 | |
12039 | if (isa<TypeDecl>(ND)) |
12040 | return HasTypenameKeyword || !IsInstantiation; |
12041 | |
12042 | return !HasTypenameKeyword; |
12043 | } |
12044 | |
12045 | std::unique_ptr<CorrectionCandidateCallback> clone() override { |
12046 | return std::make_unique<UsingValidatorCCC>(*this); |
12047 | } |
12048 | |
12049 | private: |
12050 | bool HasTypenameKeyword; |
12051 | bool IsInstantiation; |
12052 | NestedNameSpecifier *OldNNS; |
12053 | CXXRecordDecl *RequireMemberOf; |
12054 | }; |
12055 | } // end anonymous namespace |
12056 | |
12057 | /// Remove decls we can't actually see from a lookup being used to declare |
12058 | /// shadow using decls. |
12059 | /// |
12060 | /// \param S - The scope of the potential shadow decl |
12061 | /// \param Previous - The lookup of a potential shadow decl's name. |
12062 | void Sema::FilterUsingLookup(Scope *S, LookupResult &Previous) { |
12063 | // It is really dumb that we have to do this. |
12064 | LookupResult::Filter F = Previous.makeFilter(); |
12065 | while (F.hasNext()) { |
12066 | NamedDecl *D = F.next(); |
12067 | if (!isDeclInScope(D, CurContext, S)) |
12068 | F.erase(); |
12069 | // If we found a local extern declaration that's not ordinarily visible, |
12070 | // and this declaration is being added to a non-block scope, ignore it. |
12071 | // We're only checking for scope conflicts here, not also for violations |
12072 | // of the linkage rules. |
12073 | else if (!CurContext->isFunctionOrMethod() && D->isLocalExternDecl() && |
12074 | !(D->getIdentifierNamespace() & Decl::IDNS_Ordinary)) |
12075 | F.erase(); |
12076 | } |
12077 | F.done(); |
12078 | } |
12079 | |
12080 | /// Builds a using declaration. |
12081 | /// |
12082 | /// \param IsInstantiation - Whether this call arises from an |
12083 | /// instantiation of an unresolved using declaration. We treat |
12084 | /// the lookup differently for these declarations. |
12085 | NamedDecl *Sema::BuildUsingDeclaration( |
12086 | Scope *S, AccessSpecifier AS, SourceLocation UsingLoc, |
12087 | bool HasTypenameKeyword, SourceLocation TypenameLoc, CXXScopeSpec &SS, |
12088 | DeclarationNameInfo NameInfo, SourceLocation EllipsisLoc, |
12089 | const ParsedAttributesView &AttrList, bool IsInstantiation, |
12090 | bool IsUsingIfExists) { |
12091 | assert(!SS.isInvalid() && "Invalid CXXScopeSpec.")((void)0); |
12092 | SourceLocation IdentLoc = NameInfo.getLoc(); |
12093 | assert(IdentLoc.isValid() && "Invalid TargetName location.")((void)0); |
12094 | |
12095 | // FIXME: We ignore attributes for now. |
12096 | |
12097 | // For an inheriting constructor declaration, the name of the using |
12098 | // declaration is the name of a constructor in this class, not in the |
12099 | // base class. |
12100 | DeclarationNameInfo UsingName = NameInfo; |
12101 | if (UsingName.getName().getNameKind() == DeclarationName::CXXConstructorName) |
12102 | if (auto *RD = dyn_cast<CXXRecordDecl>(CurContext)) |
12103 | UsingName.setName(Context.DeclarationNames.getCXXConstructorName( |
12104 | Context.getCanonicalType(Context.getRecordType(RD)))); |
12105 | |
12106 | // Do the redeclaration lookup in the current scope. |
12107 | LookupResult Previous(*this, UsingName, LookupUsingDeclName, |
12108 | ForVisibleRedeclaration); |
12109 | Previous.setHideTags(false); |
12110 | if (S) { |
12111 | LookupName(Previous, S); |
12112 | |
12113 | FilterUsingLookup(S, Previous); |
12114 | } else { |
12115 | assert(IsInstantiation && "no scope in non-instantiation")((void)0); |
12116 | if (CurContext->isRecord()) |
12117 | LookupQualifiedName(Previous, CurContext); |
12118 | else { |
12119 | // No redeclaration check is needed here; in non-member contexts we |
12120 | // diagnosed all possible conflicts with other using-declarations when |
12121 | // building the template: |
12122 | // |
12123 | // For a dependent non-type using declaration, the only valid case is |
12124 | // if we instantiate to a single enumerator. We check for conflicts |
12125 | // between shadow declarations we introduce, and we check in the template |
12126 | // definition for conflicts between a non-type using declaration and any |
12127 | // other declaration, which together covers all cases. |
12128 | // |
12129 | // A dependent typename using declaration will never successfully |
12130 | // instantiate, since it will always name a class member, so we reject |
12131 | // that in the template definition. |
12132 | } |
12133 | } |
12134 | |
12135 | // Check for invalid redeclarations. |
12136 | if (CheckUsingDeclRedeclaration(UsingLoc, HasTypenameKeyword, |
12137 | SS, IdentLoc, Previous)) |
12138 | return nullptr; |
12139 | |
12140 | // 'using_if_exists' doesn't make sense on an inherited constructor. |
12141 | if (IsUsingIfExists && UsingName.getName().getNameKind() == |
12142 | DeclarationName::CXXConstructorName) { |
12143 | Diag(UsingLoc, diag::err_using_if_exists_on_ctor); |
12144 | return nullptr; |
12145 | } |
12146 | |
12147 | DeclContext *LookupContext = computeDeclContext(SS); |
12148 | NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); |
12149 | if (!LookupContext || EllipsisLoc.isValid()) { |
12150 | NamedDecl *D; |
12151 | // Dependent scope, or an unexpanded pack |
12152 | if (!LookupContext && CheckUsingDeclQualifier(UsingLoc, HasTypenameKeyword, |
12153 | SS, NameInfo, IdentLoc)) |
12154 | return nullptr; |
12155 | |
12156 | if (HasTypenameKeyword) { |
12157 | // FIXME: not all declaration name kinds are legal here |
12158 | D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, |
12159 | UsingLoc, TypenameLoc, |
12160 | QualifierLoc, |
12161 | IdentLoc, NameInfo.getName(), |
12162 | EllipsisLoc); |
12163 | } else { |
12164 | D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, |
12165 | QualifierLoc, NameInfo, EllipsisLoc); |
12166 | } |
12167 | D->setAccess(AS); |
12168 | CurContext->addDecl(D); |
12169 | ProcessDeclAttributeList(S, D, AttrList); |
12170 | return D; |
12171 | } |
12172 | |
12173 | auto Build = [&](bool Invalid) { |
12174 | UsingDecl *UD = |
12175 | UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, |
12176 | UsingName, HasTypenameKeyword); |
12177 | UD->setAccess(AS); |
12178 | CurContext->addDecl(UD); |
12179 | ProcessDeclAttributeList(S, UD, AttrList); |
12180 | UD->setInvalidDecl(Invalid); |
12181 | return UD; |
12182 | }; |
12183 | auto BuildInvalid = [&]{ return Build(true); }; |
12184 | auto BuildValid = [&]{ return Build(false); }; |
12185 | |
12186 | if (RequireCompleteDeclContext(SS, LookupContext)) |
12187 | return BuildInvalid(); |
12188 | |
12189 | // Look up the target name. |
12190 | LookupResult R(*this, NameInfo, LookupOrdinaryName); |
12191 | |
12192 | // Unlike most lookups, we don't always want to hide tag |
12193 | // declarations: tag names are visible through the using declaration |
12194 | // even if hidden by ordinary names, *except* in a dependent context |
12195 | // where it's important for the sanity of two-phase lookup. |
12196 | if (!IsInstantiation) |
12197 | R.setHideTags(false); |
12198 | |
12199 | // For the purposes of this lookup, we have a base object type |
12200 | // equal to that of the current context. |
12201 | if (CurContext->isRecord()) { |
12202 | R.setBaseObjectType( |
12203 | Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); |
12204 | } |
12205 | |
12206 | LookupQualifiedName(R, LookupContext); |
12207 | |
12208 | // Validate the context, now we have a lookup |
12209 | if (CheckUsingDeclQualifier(UsingLoc, HasTypenameKeyword, SS, NameInfo, |
12210 | IdentLoc, &R)) |
12211 | return nullptr; |
12212 | |
12213 | if (R.empty() && IsUsingIfExists) |
12214 | R.addDecl(UnresolvedUsingIfExistsDecl::Create(Context, CurContext, UsingLoc, |
12215 | UsingName.getName()), |
12216 | AS_public); |
12217 | |
12218 | // Try to correct typos if possible. If constructor name lookup finds no |
12219 | // results, that means the named class has no explicit constructors, and we |
12220 | // suppressed declaring implicit ones (probably because it's dependent or |
12221 | // invalid). |
12222 | if (R.empty() && |
12223 | NameInfo.getName().getNameKind() != DeclarationName::CXXConstructorName) { |
12224 | // HACK 2017-01-08: Work around an issue with libstdc++'s detection of |
12225 | // ::gets. Sometimes it believes that glibc provides a ::gets in cases where |
12226 | // it does not. The issue was fixed in libstdc++ 6.3 (2016-12-21) and later. |
12227 | auto *II = NameInfo.getName().getAsIdentifierInfo(); |
12228 | if (getLangOpts().CPlusPlus14 && II && II->isStr("gets") && |
12229 | CurContext->isStdNamespace() && |
12230 | isa<TranslationUnitDecl>(LookupContext) && |
12231 | getSourceManager().isInSystemHeader(UsingLoc)) |
12232 | return nullptr; |
12233 | UsingValidatorCCC CCC(HasTypenameKeyword, IsInstantiation, SS.getScopeRep(), |
12234 | dyn_cast<CXXRecordDecl>(CurContext)); |
12235 | if (TypoCorrection Corrected = |
12236 | CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, CCC, |
12237 | CTK_ErrorRecovery)) { |
12238 | // We reject candidates where DroppedSpecifier == true, hence the |
12239 | // literal '0' below. |
12240 | diagnoseTypo(Corrected, PDiag(diag::err_no_member_suggest) |
12241 | << NameInfo.getName() << LookupContext << 0 |
12242 | << SS.getRange()); |
12243 | |
12244 | // If we picked a correction with no attached Decl we can't do anything |
12245 | // useful with it, bail out. |
12246 | NamedDecl *ND = Corrected.getCorrectionDecl(); |
12247 | if (!ND) |
12248 | return BuildInvalid(); |
12249 | |
12250 | // If we corrected to an inheriting constructor, handle it as one. |
12251 | auto *RD = dyn_cast<CXXRecordDecl>(ND); |
12252 | if (RD && RD->isInjectedClassName()) { |
12253 | // The parent of the injected class name is the class itself. |
12254 | RD = cast<CXXRecordDecl>(RD->getParent()); |
12255 | |
12256 | // Fix up the information we'll use to build the using declaration. |
12257 | if (Corrected.WillReplaceSpecifier()) { |
12258 | NestedNameSpecifierLocBuilder Builder; |
12259 | Builder.MakeTrivial(Context, Corrected.getCorrectionSpecifier(), |
12260 | QualifierLoc.getSourceRange()); |
12261 | QualifierLoc = Builder.getWithLocInContext(Context); |
12262 | } |
12263 | |
12264 | // In this case, the name we introduce is the name of a derived class |
12265 | // constructor. |
12266 | auto *CurClass = cast<CXXRecordDecl>(CurContext); |
12267 | UsingName.setName(Context.DeclarationNames.getCXXConstructorName( |
12268 | Context.getCanonicalType(Context.getRecordType(CurClass)))); |
12269 | UsingName.setNamedTypeInfo(nullptr); |
12270 | for (auto *Ctor : LookupConstructors(RD)) |
12271 | R.addDecl(Ctor); |
12272 | R.resolveKind(); |
12273 | } else { |
12274 | // FIXME: Pick up all the declarations if we found an overloaded |
12275 | // function. |
12276 | UsingName.setName(ND->getDeclName()); |
12277 | R.addDecl(ND); |
12278 | } |
12279 | } else { |
12280 | Diag(IdentLoc, diag::err_no_member) |
12281 | << NameInfo.getName() << LookupContext << SS.getRange(); |
12282 | return BuildInvalid(); |
12283 | } |
12284 | } |
12285 | |
12286 | if (R.isAmbiguous()) |
12287 | return BuildInvalid(); |
12288 | |
12289 | if (HasTypenameKeyword) { |
12290 | // If we asked for a typename and got a non-type decl, error out. |
12291 | if (!R.getAsSingle<TypeDecl>() && |
12292 | !R.getAsSingle<UnresolvedUsingIfExistsDecl>()) { |
12293 | Diag(IdentLoc, diag::err_using_typename_non_type); |
12294 | for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) |
12295 | Diag((*I)->getUnderlyingDecl()->getLocation(), |
12296 | diag::note_using_decl_target); |
12297 | return BuildInvalid(); |
12298 | } |
12299 | } else { |
12300 | // If we asked for a non-typename and we got a type, error out, |
12301 | // but only if this is an instantiation of an unresolved using |
12302 | // decl. Otherwise just silently find the type name. |
12303 | if (IsInstantiation && R.getAsSingle<TypeDecl>()) { |
12304 | Diag(IdentLoc, diag::err_using_dependent_value_is_type); |
12305 | Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); |
12306 | return BuildInvalid(); |
12307 | } |
12308 | } |
12309 | |
12310 | // C++14 [namespace.udecl]p6: |
12311 | // A using-declaration shall not name a namespace. |
12312 | if (R.getAsSingle<NamespaceDecl>()) { |
12313 | Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) |
12314 | << SS.getRange(); |
12315 | return BuildInvalid(); |
12316 | } |
12317 | |
12318 | UsingDecl *UD = BuildValid(); |
12319 | |
12320 | // Some additional rules apply to inheriting constructors. |
12321 | if (UsingName.getName().getNameKind() == |
12322 | DeclarationName::CXXConstructorName) { |
12323 | // Suppress access diagnostics; the access check is instead performed at the |
12324 | // point of use for an inheriting constructor. |
12325 | R.suppressDiagnostics(); |
12326 | if (CheckInheritingConstructorUsingDecl(UD)) |
12327 | return UD; |
12328 | } |
12329 | |
12330 | for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { |
12331 | UsingShadowDecl *PrevDecl = nullptr; |
12332 | if (!CheckUsingShadowDecl(UD, *I, Previous, PrevDecl)) |
12333 | BuildUsingShadowDecl(S, UD, *I, PrevDecl); |
12334 | } |
12335 | |
12336 | return UD; |
12337 | } |
12338 | |
12339 | NamedDecl *Sema::BuildUsingEnumDeclaration(Scope *S, AccessSpecifier AS, |
12340 | SourceLocation UsingLoc, |
12341 | SourceLocation EnumLoc, |
12342 | SourceLocation NameLoc, |
12343 | EnumDecl *ED) { |
12344 | bool Invalid = false; |
12345 | |
12346 | if (CurContext->getRedeclContext()->isRecord()) { |
12347 | /// In class scope, check if this is a duplicate, for better a diagnostic. |
12348 | DeclarationNameInfo UsingEnumName(ED->getDeclName(), NameLoc); |
12349 | LookupResult Previous(*this, UsingEnumName, LookupUsingDeclName, |
12350 | ForVisibleRedeclaration); |
12351 | |
12352 | LookupName(Previous, S); |
12353 | |
12354 | for (NamedDecl *D : Previous) |
12355 | if (UsingEnumDecl *UED = dyn_cast<UsingEnumDecl>(D)) |
12356 | if (UED->getEnumDecl() == ED) { |
12357 | Diag(UsingLoc, diag::err_using_enum_decl_redeclaration) |
12358 | << SourceRange(EnumLoc, NameLoc); |
12359 | Diag(D->getLocation(), diag::note_using_enum_decl) << 1; |
12360 | Invalid = true; |
12361 | break; |
12362 | } |
12363 | } |
12364 | |
12365 | if (RequireCompleteEnumDecl(ED, NameLoc)) |
12366 | Invalid = true; |
12367 | |
12368 | UsingEnumDecl *UD = UsingEnumDecl::Create(Context, CurContext, UsingLoc, |
12369 | EnumLoc, NameLoc, ED); |
12370 | UD->setAccess(AS); |
12371 | CurContext->addDecl(UD); |
12372 | |
12373 | if (Invalid) { |
12374 | UD->setInvalidDecl(); |
12375 | return UD; |
12376 | } |
12377 | |
12378 | // Create the shadow decls for each enumerator |
12379 | for (EnumConstantDecl *EC : ED->enumerators()) { |
12380 | UsingShadowDecl *PrevDecl = nullptr; |
12381 | DeclarationNameInfo DNI(EC->getDeclName(), EC->getLocation()); |
12382 | LookupResult Previous(*this, DNI, LookupOrdinaryName, |
12383 | ForVisibleRedeclaration); |
12384 | LookupName(Previous, S); |
12385 | FilterUsingLookup(S, Previous); |
12386 | |
12387 | if (!CheckUsingShadowDecl(UD, EC, Previous, PrevDecl)) |
12388 | BuildUsingShadowDecl(S, UD, EC, PrevDecl); |
12389 | } |
12390 | |
12391 | return UD; |
12392 | } |
12393 | |
12394 | NamedDecl *Sema::BuildUsingPackDecl(NamedDecl *InstantiatedFrom, |
12395 | ArrayRef<NamedDecl *> Expansions) { |
12396 | assert(isa<UnresolvedUsingValueDecl>(InstantiatedFrom) ||((void)0) |
12397 | isa<UnresolvedUsingTypenameDecl>(InstantiatedFrom) ||((void)0) |
12398 | isa<UsingPackDecl>(InstantiatedFrom))((void)0); |
12399 | |
12400 | auto *UPD = |
12401 | UsingPackDecl::Create(Context, CurContext, InstantiatedFrom, Expansions); |
12402 | UPD->setAccess(InstantiatedFrom->getAccess()); |
12403 | CurContext->addDecl(UPD); |
12404 | return UPD; |
12405 | } |
12406 | |
12407 | /// Additional checks for a using declaration referring to a constructor name. |
12408 | bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { |
12409 | assert(!UD->hasTypename() && "expecting a constructor name")((void)0); |
12410 | |
12411 | const Type *SourceType = UD->getQualifier()->getAsType(); |
12412 | assert(SourceType &&((void)0) |
12413 | "Using decl naming constructor doesn't have type in scope spec.")((void)0); |
12414 | CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); |
12415 | |
12416 | // Check whether the named type is a direct base class. |
12417 | bool AnyDependentBases = false; |
12418 | auto *Base = findDirectBaseWithType(TargetClass, QualType(SourceType, 0), |
12419 | AnyDependentBases); |
12420 | if (!Base && !AnyDependentBases) { |
12421 | Diag(UD->getUsingLoc(), |
12422 | diag::err_using_decl_constructor_not_in_direct_base) |
12423 | << UD->getNameInfo().getSourceRange() |
12424 | << QualType(SourceType, 0) << TargetClass; |
12425 | UD->setInvalidDecl(); |
12426 | return true; |
12427 | } |
12428 | |
12429 | if (Base) |
12430 | Base->setInheritConstructors(); |
12431 | |
12432 | return false; |
12433 | } |
12434 | |
12435 | /// Checks that the given using declaration is not an invalid |
12436 | /// redeclaration. Note that this is checking only for the using decl |
12437 | /// itself, not for any ill-formedness among the UsingShadowDecls. |
12438 | bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, |
12439 | bool HasTypenameKeyword, |
12440 | const CXXScopeSpec &SS, |
12441 | SourceLocation NameLoc, |
12442 | const LookupResult &Prev) { |
12443 | NestedNameSpecifier *Qual = SS.getScopeRep(); |
12444 | |
12445 | // C++03 [namespace.udecl]p8: |
12446 | // C++0x [namespace.udecl]p10: |
12447 | // A using-declaration is a declaration and can therefore be used |
12448 | // repeatedly where (and only where) multiple declarations are |
12449 | // allowed. |
12450 | // |
12451 | // That's in non-member contexts. |
12452 | if (!CurContext->getRedeclContext()->isRecord()) { |
12453 | // A dependent qualifier outside a class can only ever resolve to an |
12454 | // enumeration type. Therefore it conflicts with any other non-type |
12455 | // declaration in the same scope. |
12456 | // FIXME: How should we check for dependent type-type conflicts at block |
12457 | // scope? |
12458 | if (Qual->isDependent() && !HasTypenameKeyword) { |
12459 | for (auto *D : Prev) { |
12460 | if (!isa<TypeDecl>(D) && !isa<UsingDecl>(D) && !isa<UsingPackDecl>(D)) { |
12461 | bool OldCouldBeEnumerator = |
12462 | isa<UnresolvedUsingValueDecl>(D) || isa<EnumConstantDecl>(D); |
12463 | Diag(NameLoc, |
12464 | OldCouldBeEnumerator ? diag::err_redefinition |
12465 | : diag::err_redefinition_different_kind) |
12466 | << Prev.getLookupName(); |
12467 | Diag(D->getLocation(), diag::note_previous_definition); |
12468 | return true; |
12469 | } |
12470 | } |
12471 | } |
12472 | return false; |
12473 | } |
12474 | |
12475 | const NestedNameSpecifier *CNNS = |
12476 | Context.getCanonicalNestedNameSpecifier(Qual); |
12477 | for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { |
12478 | NamedDecl *D = *I; |
12479 | |
12480 | bool DTypename; |
12481 | NestedNameSpecifier *DQual; |
12482 | if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { |
12483 | DTypename = UD->hasTypename(); |
12484 | DQual = UD->getQualifier(); |
12485 | } else if (UnresolvedUsingValueDecl *UD |
12486 | = dyn_cast<UnresolvedUsingValueDecl>(D)) { |
12487 | DTypename = false; |
12488 | DQual = UD->getQualifier(); |
12489 | } else if (UnresolvedUsingTypenameDecl *UD |
12490 | = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { |
12491 | DTypename = true; |
12492 | DQual = UD->getQualifier(); |
12493 | } else continue; |
12494 | |
12495 | // using decls differ if one says 'typename' and the other doesn't. |
12496 | // FIXME: non-dependent using decls? |
12497 | if (HasTypenameKeyword != DTypename) continue; |
12498 | |
12499 | // using decls differ if they name different scopes (but note that |
12500 | // template instantiation can cause this check to trigger when it |
12501 | // didn't before instantiation). |
12502 | if (CNNS != Context.getCanonicalNestedNameSpecifier(DQual)) |
12503 | continue; |
12504 | |
12505 | Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); |
12506 | Diag(D->getLocation(), diag::note_using_decl) << 1; |
12507 | return true; |
12508 | } |
12509 | |
12510 | return false; |
12511 | } |
12512 | |
12513 | /// Checks that the given nested-name qualifier used in a using decl |
12514 | /// in the current context is appropriately related to the current |
12515 | /// scope. If an error is found, diagnoses it and returns true. |
12516 | /// R is nullptr, if the caller has not (yet) done a lookup, otherwise it's the |
12517 | /// result of that lookup. UD is likewise nullptr, except when we have an |
12518 | /// already-populated UsingDecl whose shadow decls contain the same information |
12519 | /// (i.e. we're instantiating a UsingDecl with non-dependent scope). |
12520 | bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, bool HasTypename, |
12521 | const CXXScopeSpec &SS, |
12522 | const DeclarationNameInfo &NameInfo, |
12523 | SourceLocation NameLoc, |
12524 | const LookupResult *R, const UsingDecl *UD) { |
12525 | DeclContext *NamedContext = computeDeclContext(SS); |
12526 | assert(bool(NamedContext) == (R || UD) && !(R && UD) &&((void)0) |
12527 | "resolvable context must have exactly one set of decls")((void)0); |
12528 | |
12529 | // C++ 20 permits using an enumerator that does not have a class-hierarchy |
12530 | // relationship. |
12531 | bool Cxx20Enumerator = false; |
12532 | if (NamedContext) { |
12533 | EnumConstantDecl *EC = nullptr; |
12534 | if (R) |
12535 | EC = R->getAsSingle<EnumConstantDecl>(); |
12536 | else if (UD && UD->shadow_size() == 1) |
12537 | EC = dyn_cast<EnumConstantDecl>(UD->shadow_begin()->getTargetDecl()); |
12538 | if (EC) |
12539 | Cxx20Enumerator = getLangOpts().CPlusPlus20; |
12540 | |
12541 | if (auto *ED = dyn_cast<EnumDecl>(NamedContext)) { |
12542 | // C++14 [namespace.udecl]p7: |
12543 | // A using-declaration shall not name a scoped enumerator. |
12544 | // C++20 p1099 permits enumerators. |
12545 | if (EC && R && ED->isScoped()) |
12546 | Diag(SS.getBeginLoc(), |
12547 | getLangOpts().CPlusPlus20 |
12548 | ? diag::warn_cxx17_compat_using_decl_scoped_enumerator |
12549 | : diag::ext_using_decl_scoped_enumerator) |
12550 | << SS.getRange(); |
12551 | |
12552 | // We want to consider the scope of the enumerator |
12553 | NamedContext = ED->getDeclContext(); |
12554 | } |
12555 | } |
12556 | |
12557 | if (!CurContext->isRecord()) { |
12558 | // C++03 [namespace.udecl]p3: |
12559 | // C++0x [namespace.udecl]p8: |
12560 | // A using-declaration for a class member shall be a member-declaration. |
12561 | // C++20 [namespace.udecl]p7 |
12562 | // ... other than an enumerator ... |
12563 | |
12564 | // If we weren't able to compute a valid scope, it might validly be a |
12565 | // dependent class or enumeration scope. If we have a 'typename' keyword, |
12566 | // the scope must resolve to a class type. |
12567 | if (NamedContext ? !NamedContext->getRedeclContext()->isRecord() |
12568 | : !HasTypename) |
12569 | return false; // OK |
12570 | |
12571 | Diag(NameLoc, |
12572 | Cxx20Enumerator |
12573 | ? diag::warn_cxx17_compat_using_decl_class_member_enumerator |
12574 | : diag::err_using_decl_can_not_refer_to_class_member) |
12575 | << SS.getRange(); |
12576 | |
12577 | if (Cxx20Enumerator) |
12578 | return false; // OK |
12579 | |
12580 | auto *RD = NamedContext |
12581 | ? cast<CXXRecordDecl>(NamedContext->getRedeclContext()) |
12582 | : nullptr; |
12583 | if (RD && !RequireCompleteDeclContext(const_cast<CXXScopeSpec &>(SS), RD)) { |
12584 | // See if there's a helpful fixit |
12585 | |
12586 | if (!R) { |
12587 | // We will have already diagnosed the problem on the template |
12588 | // definition, Maybe we should do so again? |
12589 | } else if (R->getAsSingle<TypeDecl>()) { |
12590 | if (getLangOpts().CPlusPlus11) { |
12591 | // Convert 'using X::Y;' to 'using Y = X::Y;'. |
12592 | Diag(SS.getBeginLoc(), diag::note_using_decl_class_member_workaround) |
12593 | << 0 // alias declaration |
12594 | << FixItHint::CreateInsertion(SS.getBeginLoc(), |
12595 | NameInfo.getName().getAsString() + |
12596 | " = "); |
12597 | } else { |
12598 | // Convert 'using X::Y;' to 'typedef X::Y Y;'. |
12599 | SourceLocation InsertLoc = getLocForEndOfToken(NameInfo.getEndLoc()); |
12600 | Diag(InsertLoc, diag::note_using_decl_class_member_workaround) |
12601 | << 1 // typedef declaration |
12602 | << FixItHint::CreateReplacement(UsingLoc, "typedef") |
12603 | << FixItHint::CreateInsertion( |
12604 | InsertLoc, " " + NameInfo.getName().getAsString()); |
12605 | } |
12606 | } else if (R->getAsSingle<VarDecl>()) { |
12607 | // Don't provide a fixit outside C++11 mode; we don't want to suggest |
12608 | // repeating the type of the static data member here. |
12609 | FixItHint FixIt; |
12610 | if (getLangOpts().CPlusPlus11) { |
12611 | // Convert 'using X::Y;' to 'auto &Y = X::Y;'. |
12612 | FixIt = FixItHint::CreateReplacement( |
12613 | UsingLoc, "auto &" + NameInfo.getName().getAsString() + " = "); |
12614 | } |
12615 | |
12616 | Diag(UsingLoc, diag::note_using_decl_class_member_workaround) |
12617 | << 2 // reference declaration |
12618 | << FixIt; |
12619 | } else if (R->getAsSingle<EnumConstantDecl>()) { |
12620 | // Don't provide a fixit outside C++11 mode; we don't want to suggest |
12621 | // repeating the type of the enumeration here, and we can't do so if |
12622 | // the type is anonymous. |
12623 | FixItHint FixIt; |
12624 | if (getLangOpts().CPlusPlus11) { |
12625 | // Convert 'using X::Y;' to 'auto &Y = X::Y;'. |
12626 | FixIt = FixItHint::CreateReplacement( |
12627 | UsingLoc, |
12628 | "constexpr auto " + NameInfo.getName().getAsString() + " = "); |
12629 | } |
12630 | |
12631 | Diag(UsingLoc, diag::note_using_decl_class_member_workaround) |
12632 | << (getLangOpts().CPlusPlus11 ? 4 : 3) // const[expr] variable |
12633 | << FixIt; |
12634 | } |
12635 | } |
12636 | |
12637 | return true; // Fail |
12638 | } |
12639 | |
12640 | // If the named context is dependent, we can't decide much. |
12641 | if (!NamedContext) { |
12642 | // FIXME: in C++0x, we can diagnose if we can prove that the |
12643 | // nested-name-specifier does not refer to a base class, which is |
12644 | // still possible in some cases. |
12645 | |
12646 | // Otherwise we have to conservatively report that things might be |
12647 | // okay. |
12648 | return false; |
12649 | } |
12650 | |
12651 | // The current scope is a record. |
12652 | if (!NamedContext->isRecord()) { |
12653 | // Ideally this would point at the last name in the specifier, |
12654 | // but we don't have that level of source info. |
12655 | Diag(SS.getBeginLoc(), |
12656 | Cxx20Enumerator |
12657 | ? diag::warn_cxx17_compat_using_decl_non_member_enumerator |
12658 | : diag::err_using_decl_nested_name_specifier_is_not_class) |
12659 | << SS.getScopeRep() << SS.getRange(); |
12660 | |
12661 | if (Cxx20Enumerator) |
12662 | return false; // OK |
12663 | |
12664 | return true; |
12665 | } |
12666 | |
12667 | if (!NamedContext->isDependentContext() && |
12668 | RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) |
12669 | return true; |
12670 | |
12671 | if (getLangOpts().CPlusPlus11) { |
12672 | // C++11 [namespace.udecl]p3: |
12673 | // In a using-declaration used as a member-declaration, the |
12674 | // nested-name-specifier shall name a base class of the class |
12675 | // being defined. |
12676 | |
12677 | if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( |
12678 | cast<CXXRecordDecl>(NamedContext))) { |
12679 | |
12680 | if (Cxx20Enumerator) { |
12681 | Diag(NameLoc, diag::warn_cxx17_compat_using_decl_non_member_enumerator) |
12682 | << SS.getRange(); |
12683 | return false; |
12684 | } |
12685 | |
12686 | if (CurContext == NamedContext) { |
12687 | Diag(SS.getBeginLoc(), |
12688 | diag::err_using_decl_nested_name_specifier_is_current_class) |
12689 | << SS.getRange(); |
12690 | return !getLangOpts().CPlusPlus20; |
12691 | } |
12692 | |
12693 | if (!cast<CXXRecordDecl>(NamedContext)->isInvalidDecl()) { |
12694 | Diag(SS.getBeginLoc(), |
12695 | diag::err_using_decl_nested_name_specifier_is_not_base_class) |
12696 | << SS.getScopeRep() << cast<CXXRecordDecl>(CurContext) |
12697 | << SS.getRange(); |
12698 | } |
12699 | return true; |
12700 | } |
12701 | |
12702 | return false; |
12703 | } |
12704 | |
12705 | // C++03 [namespace.udecl]p4: |
12706 | // A using-declaration used as a member-declaration shall refer |
12707 | // to a member of a base class of the class being defined [etc.]. |
12708 | |
12709 | // Salient point: SS doesn't have to name a base class as long as |
12710 | // lookup only finds members from base classes. Therefore we can |
12711 | // diagnose here only if we can prove that that can't happen, |
12712 | // i.e. if the class hierarchies provably don't intersect. |
12713 | |
12714 | // TODO: it would be nice if "definitely valid" results were cached |
12715 | // in the UsingDecl and UsingShadowDecl so that these checks didn't |
12716 | // need to be repeated. |
12717 | |
12718 | llvm::SmallPtrSet<const CXXRecordDecl *, 4> Bases; |
12719 | auto Collect = [&Bases](const CXXRecordDecl *Base) { |
12720 | Bases.insert(Base); |
12721 | return true; |
12722 | }; |
12723 | |
12724 | // Collect all bases. Return false if we find a dependent base. |
12725 | if (!cast<CXXRecordDecl>(CurContext)->forallBases(Collect)) |
12726 | return false; |
12727 | |
12728 | // Returns true if the base is dependent or is one of the accumulated base |
12729 | // classes. |
12730 | auto IsNotBase = [&Bases](const CXXRecordDecl *Base) { |
12731 | return !Bases.count(Base); |
12732 | }; |
12733 | |
12734 | // Return false if the class has a dependent base or if it or one |
12735 | // of its bases is present in the base set of the current context. |
12736 | if (Bases.count(cast<CXXRecordDecl>(NamedContext)) || |
12737 | !cast<CXXRecordDecl>(NamedContext)->forallBases(IsNotBase)) |
12738 | return false; |
12739 | |
12740 | Diag(SS.getRange().getBegin(), |
12741 | diag::err_using_decl_nested_name_specifier_is_not_base_class) |
12742 | << SS.getScopeRep() |
12743 | << cast<CXXRecordDecl>(CurContext) |
12744 | << SS.getRange(); |
12745 | |
12746 | return true; |
12747 | } |
12748 | |
12749 | Decl *Sema::ActOnAliasDeclaration(Scope *S, AccessSpecifier AS, |
12750 | MultiTemplateParamsArg TemplateParamLists, |
12751 | SourceLocation UsingLoc, UnqualifiedId &Name, |
12752 | const ParsedAttributesView &AttrList, |
12753 | TypeResult Type, Decl *DeclFromDeclSpec) { |
12754 | // Skip up to the relevant declaration scope. |
12755 | while (S->isTemplateParamScope()) |
12756 | S = S->getParent(); |
12757 | assert((S->getFlags() & Scope::DeclScope) &&((void)0) |
12758 | "got alias-declaration outside of declaration scope")((void)0); |
12759 | |
12760 | if (Type.isInvalid()) |
12761 | return nullptr; |
12762 | |
12763 | bool Invalid = false; |
12764 | DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); |
12765 | TypeSourceInfo *TInfo = nullptr; |
12766 | GetTypeFromParser(Type.get(), &TInfo); |
12767 | |
12768 | if (DiagnoseClassNameShadow(CurContext, NameInfo)) |
12769 | return nullptr; |
12770 | |
12771 | if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, |
12772 | UPPC_DeclarationType)) { |
12773 | Invalid = true; |
12774 | TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, |
12775 | TInfo->getTypeLoc().getBeginLoc()); |
12776 | } |
12777 | |
12778 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName, |
12779 | TemplateParamLists.size() |
12780 | ? forRedeclarationInCurContext() |
12781 | : ForVisibleRedeclaration); |
12782 | LookupName(Previous, S); |
12783 | |
12784 | // Warn about shadowing the name of a template parameter. |
12785 | if (Previous.isSingleResult() && |
12786 | Previous.getFoundDecl()->isTemplateParameter()) { |
12787 | DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); |
12788 | Previous.clear(); |
12789 | } |
12790 | |
12791 | assert(Name.Kind == UnqualifiedIdKind::IK_Identifier &&((void)0) |
12792 | "name in alias declaration must be an identifier")((void)0); |
12793 | TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, |
12794 | Name.StartLocation, |
12795 | Name.Identifier, TInfo); |
12796 | |
12797 | NewTD->setAccess(AS); |
12798 | |
12799 | if (Invalid) |
12800 | NewTD->setInvalidDecl(); |
12801 | |
12802 | ProcessDeclAttributeList(S, NewTD, AttrList); |
12803 | AddPragmaAttributes(S, NewTD); |
12804 | |
12805 | CheckTypedefForVariablyModifiedType(S, NewTD); |
12806 | Invalid |= NewTD->isInvalidDecl(); |
12807 | |
12808 | bool Redeclaration = false; |
12809 | |
12810 | NamedDecl *NewND; |
12811 | if (TemplateParamLists.size()) { |
12812 | TypeAliasTemplateDecl *OldDecl = nullptr; |
12813 | TemplateParameterList *OldTemplateParams = nullptr; |
12814 | |
12815 | if (TemplateParamLists.size() != 1) { |
12816 | Diag(UsingLoc, diag::err_alias_template_extra_headers) |
12817 | << SourceRange(TemplateParamLists[1]->getTemplateLoc(), |
12818 | TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); |
12819 | } |
12820 | TemplateParameterList *TemplateParams = TemplateParamLists[0]; |
12821 | |
12822 | // Check that we can declare a template here. |
12823 | if (CheckTemplateDeclScope(S, TemplateParams)) |
12824 | return nullptr; |
12825 | |
12826 | // Only consider previous declarations in the same scope. |
12827 | FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, |
12828 | /*ExplicitInstantiationOrSpecialization*/false); |
12829 | if (!Previous.empty()) { |
12830 | Redeclaration = true; |
12831 | |
12832 | OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); |
12833 | if (!OldDecl && !Invalid) { |
12834 | Diag(UsingLoc, diag::err_redefinition_different_kind) |
12835 | << Name.Identifier; |
12836 | |
12837 | NamedDecl *OldD = Previous.getRepresentativeDecl(); |
12838 | if (OldD->getLocation().isValid()) |
12839 | Diag(OldD->getLocation(), diag::note_previous_definition); |
12840 | |
12841 | Invalid = true; |
12842 | } |
12843 | |
12844 | if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { |
12845 | if (TemplateParameterListsAreEqual(TemplateParams, |
12846 | OldDecl->getTemplateParameters(), |
12847 | /*Complain=*/true, |
12848 | TPL_TemplateMatch)) |
12849 | OldTemplateParams = |
12850 | OldDecl->getMostRecentDecl()->getTemplateParameters(); |
12851 | else |
12852 | Invalid = true; |
12853 | |
12854 | TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); |
12855 | if (!Invalid && |
12856 | !Context.hasSameType(OldTD->getUnderlyingType(), |
12857 | NewTD->getUnderlyingType())) { |
12858 | // FIXME: The C++0x standard does not clearly say this is ill-formed, |
12859 | // but we can't reasonably accept it. |
12860 | Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) |
12861 | << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); |
12862 | if (OldTD->getLocation().isValid()) |
12863 | Diag(OldTD->getLocation(), diag::note_previous_definition); |
12864 | Invalid = true; |
12865 | } |
12866 | } |
12867 | } |
12868 | |
12869 | // Merge any previous default template arguments into our parameters, |
12870 | // and check the parameter list. |
12871 | if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, |
12872 | TPC_TypeAliasTemplate)) |
12873 | return nullptr; |
12874 | |
12875 | TypeAliasTemplateDecl *NewDecl = |
12876 | TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, |
12877 | Name.Identifier, TemplateParams, |
12878 | NewTD); |
12879 | NewTD->setDescribedAliasTemplate(NewDecl); |
12880 | |
12881 | NewDecl->setAccess(AS); |
12882 | |
12883 | if (Invalid) |
12884 | NewDecl->setInvalidDecl(); |
12885 | else if (OldDecl) { |
12886 | NewDecl->setPreviousDecl(OldDecl); |
12887 | CheckRedeclarationModuleOwnership(NewDecl, OldDecl); |
12888 | } |
12889 | |
12890 | NewND = NewDecl; |
12891 | } else { |
12892 | if (auto *TD = dyn_cast_or_null<TagDecl>(DeclFromDeclSpec)) { |
12893 | setTagNameForLinkagePurposes(TD, NewTD); |
12894 | handleTagNumbering(TD, S); |
12895 | } |
12896 | ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); |
12897 | NewND = NewTD; |
12898 | } |
12899 | |
12900 | PushOnScopeChains(NewND, S); |
12901 | ActOnDocumentableDecl(NewND); |
12902 | return NewND; |
12903 | } |
12904 | |
12905 | Decl *Sema::ActOnNamespaceAliasDef(Scope *S, SourceLocation NamespaceLoc, |
12906 | SourceLocation AliasLoc, |
12907 | IdentifierInfo *Alias, CXXScopeSpec &SS, |
12908 | SourceLocation IdentLoc, |
12909 | IdentifierInfo *Ident) { |
12910 | |
12911 | // Lookup the namespace name. |
12912 | LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); |
12913 | LookupParsedName(R, S, &SS); |
12914 | |
12915 | if (R.isAmbiguous()) |
12916 | return nullptr; |
12917 | |
12918 | if (R.empty()) { |
12919 | if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { |
12920 | Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); |
12921 | return nullptr; |
12922 | } |
12923 | } |
12924 | assert(!R.isAmbiguous() && !R.empty())((void)0); |
12925 | NamedDecl *ND = R.getRepresentativeDecl(); |
12926 | |
12927 | // Check if we have a previous declaration with the same name. |
12928 | LookupResult PrevR(*this, Alias, AliasLoc, LookupOrdinaryName, |
12929 | ForVisibleRedeclaration); |
12930 | LookupName(PrevR, S); |
12931 | |
12932 | // Check we're not shadowing a template parameter. |
12933 | if (PrevR.isSingleResult() && PrevR.getFoundDecl()->isTemplateParameter()) { |
12934 | DiagnoseTemplateParameterShadow(AliasLoc, PrevR.getFoundDecl()); |
12935 | PrevR.clear(); |
12936 | } |
12937 | |
12938 | // Filter out any other lookup result from an enclosing scope. |
12939 | FilterLookupForScope(PrevR, CurContext, S, /*ConsiderLinkage*/false, |
12940 | /*AllowInlineNamespace*/false); |
12941 | |
12942 | // Find the previous declaration and check that we can redeclare it. |
12943 | NamespaceAliasDecl *Prev = nullptr; |
12944 | if (PrevR.isSingleResult()) { |
12945 | NamedDecl *PrevDecl = PrevR.getRepresentativeDecl(); |
12946 | if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { |
12947 | // We already have an alias with the same name that points to the same |
12948 | // namespace; check that it matches. |
12949 | if (AD->getNamespace()->Equals(getNamespaceDecl(ND))) { |
12950 | Prev = AD; |
12951 | } else if (isVisible(PrevDecl)) { |
12952 | Diag(AliasLoc, diag::err_redefinition_different_namespace_alias) |
12953 | << Alias; |
12954 | Diag(AD->getLocation(), diag::note_previous_namespace_alias) |
12955 | << AD->getNamespace(); |
12956 | return nullptr; |
12957 | } |
12958 | } else if (isVisible(PrevDecl)) { |
12959 | unsigned DiagID = isa<NamespaceDecl>(PrevDecl->getUnderlyingDecl()) |
12960 | ? diag::err_redefinition |
12961 | : diag::err_redefinition_different_kind; |
12962 | Diag(AliasLoc, DiagID) << Alias; |
12963 | Diag(PrevDecl->getLocation(), diag::note_previous_definition); |
12964 | return nullptr; |
12965 | } |
12966 | } |
12967 | |
12968 | // The use of a nested name specifier may trigger deprecation warnings. |
12969 | DiagnoseUseOfDecl(ND, IdentLoc); |
12970 | |
12971 | NamespaceAliasDecl *AliasDecl = |
12972 | NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, |
12973 | Alias, SS.getWithLocInContext(Context), |
12974 | IdentLoc, ND); |
12975 | if (Prev) |
12976 | AliasDecl->setPreviousDecl(Prev); |
12977 | |
12978 | PushOnScopeChains(AliasDecl, S); |
12979 | return AliasDecl; |
12980 | } |
12981 | |
12982 | namespace { |
12983 | struct SpecialMemberExceptionSpecInfo |
12984 | : SpecialMemberVisitor<SpecialMemberExceptionSpecInfo> { |
12985 | SourceLocation Loc; |
12986 | Sema::ImplicitExceptionSpecification ExceptSpec; |
12987 | |
12988 | SpecialMemberExceptionSpecInfo(Sema &S, CXXMethodDecl *MD, |
12989 | Sema::CXXSpecialMember CSM, |
12990 | Sema::InheritedConstructorInfo *ICI, |
12991 | SourceLocation Loc) |
12992 | : SpecialMemberVisitor(S, MD, CSM, ICI), Loc(Loc), ExceptSpec(S) {} |
12993 | |
12994 | bool visitBase(CXXBaseSpecifier *Base); |
12995 | bool visitField(FieldDecl *FD); |
12996 | |
12997 | void visitClassSubobject(CXXRecordDecl *Class, Subobject Subobj, |
12998 | unsigned Quals); |
12999 | |
13000 | void visitSubobjectCall(Subobject Subobj, |
13001 | Sema::SpecialMemberOverloadResult SMOR); |
13002 | }; |
13003 | } |
13004 | |
13005 | bool SpecialMemberExceptionSpecInfo::visitBase(CXXBaseSpecifier *Base) { |
13006 | auto *RT = Base->getType()->getAs<RecordType>(); |
13007 | if (!RT) |
13008 | return false; |
13009 | |
13010 | auto *BaseClass = cast<CXXRecordDecl>(RT->getDecl()); |
13011 | Sema::SpecialMemberOverloadResult SMOR = lookupInheritedCtor(BaseClass); |
13012 | if (auto *BaseCtor = SMOR.getMethod()) { |
13013 | visitSubobjectCall(Base, BaseCtor); |
13014 | return false; |
13015 | } |
13016 | |
13017 | visitClassSubobject(BaseClass, Base, 0); |
13018 | return false; |
13019 | } |
13020 | |
13021 | bool SpecialMemberExceptionSpecInfo::visitField(FieldDecl *FD) { |
13022 | if (CSM == Sema::CXXDefaultConstructor && FD->hasInClassInitializer()) { |
13023 | Expr *E = FD->getInClassInitializer(); |
13024 | if (!E) |
13025 | // FIXME: It's a little wasteful to build and throw away a |
13026 | // CXXDefaultInitExpr here. |
13027 | // FIXME: We should have a single context note pointing at Loc, and |
13028 | // this location should be MD->getLocation() instead, since that's |
13029 | // the location where we actually use the default init expression. |
13030 | E = S.BuildCXXDefaultInitExpr(Loc, FD).get(); |
13031 | if (E) |
13032 | ExceptSpec.CalledExpr(E); |
13033 | } else if (auto *RT = S.Context.getBaseElementType(FD->getType()) |
13034 | ->getAs<RecordType>()) { |
13035 | visitClassSubobject(cast<CXXRecordDecl>(RT->getDecl()), FD, |
13036 | FD->getType().getCVRQualifiers()); |
13037 | } |
13038 | return false; |
13039 | } |
13040 | |
13041 | void SpecialMemberExceptionSpecInfo::visitClassSubobject(CXXRecordDecl *Class, |
13042 | Subobject Subobj, |
13043 | unsigned Quals) { |
13044 | FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); |
13045 | bool IsMutable = Field && Field->isMutable(); |
13046 | visitSubobjectCall(Subobj, lookupIn(Class, Quals, IsMutable)); |
13047 | } |
13048 | |
13049 | void SpecialMemberExceptionSpecInfo::visitSubobjectCall( |
13050 | Subobject Subobj, Sema::SpecialMemberOverloadResult SMOR) { |
13051 | // Note, if lookup fails, it doesn't matter what exception specification we |
13052 | // choose because the special member will be deleted. |
13053 | if (CXXMethodDecl *MD = SMOR.getMethod()) |
13054 | ExceptSpec.CalledDecl(getSubobjectLoc(Subobj), MD); |
13055 | } |
13056 | |
13057 | bool Sema::tryResolveExplicitSpecifier(ExplicitSpecifier &ExplicitSpec) { |
13058 | llvm::APSInt Result; |
13059 | ExprResult Converted = CheckConvertedConstantExpression( |
13060 | ExplicitSpec.getExpr(), Context.BoolTy, Result, CCEK_ExplicitBool); |
13061 | ExplicitSpec.setExpr(Converted.get()); |
13062 | if (Converted.isUsable() && !Converted.get()->isValueDependent()) { |
13063 | ExplicitSpec.setKind(Result.getBoolValue() |
13064 | ? ExplicitSpecKind::ResolvedTrue |
13065 | : ExplicitSpecKind::ResolvedFalse); |
13066 | return true; |
13067 | } |
13068 | ExplicitSpec.setKind(ExplicitSpecKind::Unresolved); |
13069 | return false; |
13070 | } |
13071 | |
13072 | ExplicitSpecifier Sema::ActOnExplicitBoolSpecifier(Expr *ExplicitExpr) { |
13073 | ExplicitSpecifier ES(ExplicitExpr, ExplicitSpecKind::Unresolved); |
13074 | if (!ExplicitExpr->isTypeDependent()) |
13075 | tryResolveExplicitSpecifier(ES); |
13076 | return ES; |
13077 | } |
13078 | |
13079 | static Sema::ImplicitExceptionSpecification |
13080 | ComputeDefaultedSpecialMemberExceptionSpec( |
13081 | Sema &S, SourceLocation Loc, CXXMethodDecl *MD, Sema::CXXSpecialMember CSM, |
13082 | Sema::InheritedConstructorInfo *ICI) { |
13083 | ComputingExceptionSpec CES(S, MD, Loc); |
13084 | |
13085 | CXXRecordDecl *ClassDecl = MD->getParent(); |
13086 | |
13087 | // C++ [except.spec]p14: |
13088 | // An implicitly declared special member function (Clause 12) shall have an |
13089 | // exception-specification. [...] |
13090 | SpecialMemberExceptionSpecInfo Info(S, MD, CSM, ICI, MD->getLocation()); |
13091 | if (ClassDecl->isInvalidDecl()) |
13092 | return Info.ExceptSpec; |
13093 | |
13094 | // FIXME: If this diagnostic fires, we're probably missing a check for |
13095 | // attempting to resolve an exception specification before it's known |
13096 | // at a higher level. |
13097 | if (S.RequireCompleteType(MD->getLocation(), |
13098 | S.Context.getRecordType(ClassDecl), |
13099 | diag::err_exception_spec_incomplete_type)) |
13100 | return Info.ExceptSpec; |
13101 | |
13102 | // C++1z [except.spec]p7: |
13103 | // [Look for exceptions thrown by] a constructor selected [...] to |
13104 | // initialize a potentially constructed subobject, |
13105 | // C++1z [except.spec]p8: |
13106 | // The exception specification for an implicitly-declared destructor, or a |
13107 | // destructor without a noexcept-specifier, is potentially-throwing if and |
13108 | // only if any of the destructors for any of its potentially constructed |
13109 | // subojects is potentially throwing. |
13110 | // FIXME: We respect the first rule but ignore the "potentially constructed" |
13111 | // in the second rule to resolve a core issue (no number yet) that would have |
13112 | // us reject: |
13113 | // struct A { virtual void f() = 0; virtual ~A() noexcept(false) = 0; }; |
13114 | // struct B : A {}; |
13115 | // struct C : B { void f(); }; |
13116 | // ... due to giving B::~B() a non-throwing exception specification. |
13117 | Info.visit(Info.IsConstructor ? Info.VisitPotentiallyConstructedBases |
13118 | : Info.VisitAllBases); |
13119 | |
13120 | return Info.ExceptSpec; |
13121 | } |
13122 | |
13123 | namespace { |
13124 | /// RAII object to register a special member as being currently declared. |
13125 | struct DeclaringSpecialMember { |
13126 | Sema &S; |
13127 | Sema::SpecialMemberDecl D; |
13128 | Sema::ContextRAII SavedContext; |
13129 | bool WasAlreadyBeingDeclared; |
13130 | |
13131 | DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM) |
13132 | : S(S), D(RD, CSM), SavedContext(S, RD) { |
13133 | WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D).second; |
13134 | if (WasAlreadyBeingDeclared) |
13135 | // This almost never happens, but if it does, ensure that our cache |
13136 | // doesn't contain a stale result. |
13137 | S.SpecialMemberCache.clear(); |
13138 | else { |
13139 | // Register a note to be produced if we encounter an error while |
13140 | // declaring the special member. |
13141 | Sema::CodeSynthesisContext Ctx; |
13142 | Ctx.Kind = Sema::CodeSynthesisContext::DeclaringSpecialMember; |
13143 | // FIXME: We don't have a location to use here. Using the class's |
13144 | // location maintains the fiction that we declare all special members |
13145 | // with the class, but (1) it's not clear that lying about that helps our |
13146 | // users understand what's going on, and (2) there may be outer contexts |
13147 | // on the stack (some of which are relevant) and printing them exposes |
13148 | // our lies. |
13149 | Ctx.PointOfInstantiation = RD->getLocation(); |
13150 | Ctx.Entity = RD; |
13151 | Ctx.SpecialMember = CSM; |
13152 | S.pushCodeSynthesisContext(Ctx); |
13153 | } |
13154 | } |
13155 | ~DeclaringSpecialMember() { |
13156 | if (!WasAlreadyBeingDeclared) { |
13157 | S.SpecialMembersBeingDeclared.erase(D); |
13158 | S.popCodeSynthesisContext(); |
13159 | } |
13160 | } |
13161 | |
13162 | /// Are we already trying to declare this special member? |
13163 | bool isAlreadyBeingDeclared() const { |
13164 | return WasAlreadyBeingDeclared; |
13165 | } |
13166 | }; |
13167 | } |
13168 | |
13169 | void Sema::CheckImplicitSpecialMemberDeclaration(Scope *S, FunctionDecl *FD) { |
13170 | // Look up any existing declarations, but don't trigger declaration of all |
13171 | // implicit special members with this name. |
13172 | DeclarationName Name = FD->getDeclName(); |
13173 | LookupResult R(*this, Name, SourceLocation(), LookupOrdinaryName, |
13174 | ForExternalRedeclaration); |
13175 | for (auto *D : FD->getParent()->lookup(Name)) |
13176 | if (auto *Acceptable = R.getAcceptableDecl(D)) |
13177 | R.addDecl(Acceptable); |
13178 | R.resolveKind(); |
13179 | R.suppressDiagnostics(); |
13180 | |
13181 | CheckFunctionDeclaration(S, FD, R, /*IsMemberSpecialization*/false); |
13182 | } |
13183 | |
13184 | void Sema::setupImplicitSpecialMemberType(CXXMethodDecl *SpecialMem, |
13185 | QualType ResultTy, |
13186 | ArrayRef<QualType> Args) { |
13187 | // Build an exception specification pointing back at this constructor. |
13188 | FunctionProtoType::ExtProtoInfo EPI = getImplicitMethodEPI(*this, SpecialMem); |
13189 | |
13190 | LangAS AS = getDefaultCXXMethodAddrSpace(); |
13191 | if (AS != LangAS::Default) { |
13192 | EPI.TypeQuals.addAddressSpace(AS); |
13193 | } |
13194 | |
13195 | auto QT = Context.getFunctionType(ResultTy, Args, EPI); |
13196 | SpecialMem->setType(QT); |
13197 | |
13198 | // During template instantiation of implicit special member functions we need |
13199 | // a reliable TypeSourceInfo for the function prototype in order to allow |
13200 | // functions to be substituted. |
13201 | if (inTemplateInstantiation() && |
13202 | cast<CXXRecordDecl>(SpecialMem->getParent())->isLambda()) { |
13203 | TypeSourceInfo *TSI = |
13204 | Context.getTrivialTypeSourceInfo(SpecialMem->getType()); |
13205 | SpecialMem->setTypeSourceInfo(TSI); |
13206 | } |
13207 | } |
13208 | |
13209 | CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( |
13210 | CXXRecordDecl *ClassDecl) { |
13211 | // C++ [class.ctor]p5: |
13212 | // A default constructor for a class X is a constructor of class X |
13213 | // that can be called without an argument. If there is no |
13214 | // user-declared constructor for class X, a default constructor is |
13215 | // implicitly declared. An implicitly-declared default constructor |
13216 | // is an inline public member of its class. |
13217 | assert(ClassDecl->needsImplicitDefaultConstructor() &&((void)0) |
13218 | "Should not build implicit default constructor!")((void)0); |
13219 | |
13220 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor); |
13221 | if (DSM.isAlreadyBeingDeclared()) |
13222 | return nullptr; |
13223 | |
13224 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, |
13225 | CXXDefaultConstructor, |
13226 | false); |
13227 | |
13228 | // Create the actual constructor declaration. |
13229 | CanQualType ClassType |
13230 | = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); |
13231 | SourceLocation ClassLoc = ClassDecl->getLocation(); |
13232 | DeclarationName Name |
13233 | = Context.DeclarationNames.getCXXConstructorName(ClassType); |
13234 | DeclarationNameInfo NameInfo(Name, ClassLoc); |
13235 | CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( |
13236 | Context, ClassDecl, ClassLoc, NameInfo, /*Type*/ QualType(), |
13237 | /*TInfo=*/nullptr, ExplicitSpecifier(), |
13238 | /*isInline=*/true, /*isImplicitlyDeclared=*/true, |
13239 | Constexpr ? ConstexprSpecKind::Constexpr |
13240 | : ConstexprSpecKind::Unspecified); |
13241 | DefaultCon->setAccess(AS_public); |
13242 | DefaultCon->setDefaulted(); |
13243 | |
13244 | if (getLangOpts().CUDA) { |
13245 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXDefaultConstructor, |
13246 | DefaultCon, |
13247 | /* ConstRHS */ false, |
13248 | /* Diagnose */ false); |
13249 | } |
13250 | |
13251 | setupImplicitSpecialMemberType(DefaultCon, Context.VoidTy, None); |
13252 | |
13253 | // We don't need to use SpecialMemberIsTrivial here; triviality for default |
13254 | // constructors is easy to compute. |
13255 | DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); |
13256 | |
13257 | // Note that we have declared this constructor. |
13258 | ++getASTContext().NumImplicitDefaultConstructorsDeclared; |
13259 | |
13260 | Scope *S = getScopeForContext(ClassDecl); |
13261 | CheckImplicitSpecialMemberDeclaration(S, DefaultCon); |
13262 | |
13263 | if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) |
13264 | SetDeclDeleted(DefaultCon, ClassLoc); |
13265 | |
13266 | if (S) |
13267 | PushOnScopeChains(DefaultCon, S, false); |
13268 | ClassDecl->addDecl(DefaultCon); |
13269 | |
13270 | return DefaultCon; |
13271 | } |
13272 | |
13273 | void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, |
13274 | CXXConstructorDecl *Constructor) { |
13275 | assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() &&((void)0) |
13276 | !Constructor->doesThisDeclarationHaveABody() &&((void)0) |
13277 | !Constructor->isDeleted()) &&((void)0) |
13278 | "DefineImplicitDefaultConstructor - call it for implicit default ctor")((void)0); |
13279 | if (Constructor->willHaveBody() || Constructor->isInvalidDecl()) |
13280 | return; |
13281 | |
13282 | CXXRecordDecl *ClassDecl = Constructor->getParent(); |
13283 | assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor")((void)0); |
13284 | |
13285 | SynthesizedFunctionScope Scope(*this, Constructor); |
13286 | |
13287 | // The exception specification is needed because we are defining the |
13288 | // function. |
13289 | ResolveExceptionSpec(CurrentLocation, |
13290 | Constructor->getType()->castAs<FunctionProtoType>()); |
13291 | MarkVTableUsed(CurrentLocation, ClassDecl); |
13292 | |
13293 | // Add a context note for diagnostics produced after this point. |
13294 | Scope.addContextNote(CurrentLocation); |
13295 | |
13296 | if (SetCtorInitializers(Constructor, /*AnyErrors=*/false)) { |
13297 | Constructor->setInvalidDecl(); |
13298 | return; |
13299 | } |
13300 | |
13301 | SourceLocation Loc = Constructor->getEndLoc().isValid() |
13302 | ? Constructor->getEndLoc() |
13303 | : Constructor->getLocation(); |
13304 | Constructor->setBody(new (Context) CompoundStmt(Loc)); |
13305 | Constructor->markUsed(Context); |
13306 | |
13307 | if (ASTMutationListener *L = getASTMutationListener()) { |
13308 | L->CompletedImplicitDefinition(Constructor); |
13309 | } |
13310 | |
13311 | DiagnoseUninitializedFields(*this, Constructor); |
13312 | } |
13313 | |
13314 | void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { |
13315 | // Perform any delayed checks on exception specifications. |
13316 | CheckDelayedMemberExceptionSpecs(); |
13317 | } |
13318 | |
13319 | /// Find or create the fake constructor we synthesize to model constructing an |
13320 | /// object of a derived class via a constructor of a base class. |
13321 | CXXConstructorDecl * |
13322 | Sema::findInheritingConstructor(SourceLocation Loc, |
13323 | CXXConstructorDecl *BaseCtor, |
13324 | ConstructorUsingShadowDecl *Shadow) { |
13325 | CXXRecordDecl *Derived = Shadow->getParent(); |
13326 | SourceLocation UsingLoc = Shadow->getLocation(); |
13327 | |
13328 | // FIXME: Add a new kind of DeclarationName for an inherited constructor. |
13329 | // For now we use the name of the base class constructor as a member of the |
13330 | // derived class to indicate a (fake) inherited constructor name. |
13331 | DeclarationName Name = BaseCtor->getDeclName(); |
13332 | |
13333 | // Check to see if we already have a fake constructor for this inherited |
13334 | // constructor call. |
13335 | for (NamedDecl *Ctor : Derived->lookup(Name)) |
13336 | if (declaresSameEntity(cast<CXXConstructorDecl>(Ctor) |
13337 | ->getInheritedConstructor() |
13338 | .getConstructor(), |
13339 | BaseCtor)) |
13340 | return cast<CXXConstructorDecl>(Ctor); |
13341 | |
13342 | DeclarationNameInfo NameInfo(Name, UsingLoc); |
13343 | TypeSourceInfo *TInfo = |
13344 | Context.getTrivialTypeSourceInfo(BaseCtor->getType(), UsingLoc); |
13345 | FunctionProtoTypeLoc ProtoLoc = |
13346 | TInfo->getTypeLoc().IgnoreParens().castAs<FunctionProtoTypeLoc>(); |
13347 | |
13348 | // Check the inherited constructor is valid and find the list of base classes |
13349 | // from which it was inherited. |
13350 | InheritedConstructorInfo ICI(*this, Loc, Shadow); |
13351 | |
13352 | bool Constexpr = |
13353 | BaseCtor->isConstexpr() && |
13354 | defaultedSpecialMemberIsConstexpr(*this, Derived, CXXDefaultConstructor, |
13355 | false, BaseCtor, &ICI); |
13356 | |
13357 | CXXConstructorDecl *DerivedCtor = CXXConstructorDecl::Create( |
13358 | Context, Derived, UsingLoc, NameInfo, TInfo->getType(), TInfo, |
13359 | BaseCtor->getExplicitSpecifier(), /*isInline=*/true, |
13360 | /*isImplicitlyDeclared=*/true, |
13361 | Constexpr ? BaseCtor->getConstexprKind() : ConstexprSpecKind::Unspecified, |
13362 | InheritedConstructor(Shadow, BaseCtor), |
13363 | BaseCtor->getTrailingRequiresClause()); |
13364 | if (Shadow->isInvalidDecl()) |
13365 | DerivedCtor->setInvalidDecl(); |
13366 | |
13367 | // Build an unevaluated exception specification for this fake constructor. |
13368 | const FunctionProtoType *FPT = TInfo->getType()->castAs<FunctionProtoType>(); |
13369 | FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); |
13370 | EPI.ExceptionSpec.Type = EST_Unevaluated; |
13371 | EPI.ExceptionSpec.SourceDecl = DerivedCtor; |
13372 | DerivedCtor->setType(Context.getFunctionType(FPT->getReturnType(), |
13373 | FPT->getParamTypes(), EPI)); |
13374 | |
13375 | // Build the parameter declarations. |
13376 | SmallVector<ParmVarDecl *, 16> ParamDecls; |
13377 | for (unsigned I = 0, N = FPT->getNumParams(); I != N; ++I) { |
13378 | TypeSourceInfo *TInfo = |
13379 | Context.getTrivialTypeSourceInfo(FPT->getParamType(I), UsingLoc); |
13380 | ParmVarDecl *PD = ParmVarDecl::Create( |
13381 | Context, DerivedCtor, UsingLoc, UsingLoc, /*IdentifierInfo=*/nullptr, |
13382 | FPT->getParamType(I), TInfo, SC_None, /*DefArg=*/nullptr); |
13383 | PD->setScopeInfo(0, I); |
13384 | PD->setImplicit(); |
13385 | // Ensure attributes are propagated onto parameters (this matters for |
13386 | // format, pass_object_size, ...). |
13387 | mergeDeclAttributes(PD, BaseCtor->getParamDecl(I)); |
13388 | ParamDecls.push_back(PD); |
13389 | ProtoLoc.setParam(I, PD); |
13390 | } |
13391 | |
13392 | // Set up the new constructor. |
13393 | assert(!BaseCtor->isDeleted() && "should not use deleted constructor")((void)0); |
13394 | DerivedCtor->setAccess(BaseCtor->getAccess()); |
13395 | DerivedCtor->setParams(ParamDecls); |
13396 | Derived->addDecl(DerivedCtor); |
13397 | |
13398 | if (ShouldDeleteSpecialMember(DerivedCtor, CXXDefaultConstructor, &ICI)) |
13399 | SetDeclDeleted(DerivedCtor, UsingLoc); |
13400 | |
13401 | return DerivedCtor; |
13402 | } |
13403 | |
13404 | void Sema::NoteDeletedInheritingConstructor(CXXConstructorDecl *Ctor) { |
13405 | InheritedConstructorInfo ICI(*this, Ctor->getLocation(), |
13406 | Ctor->getInheritedConstructor().getShadowDecl()); |
13407 | ShouldDeleteSpecialMember(Ctor, CXXDefaultConstructor, &ICI, |
13408 | /*Diagnose*/true); |
13409 | } |
13410 | |
13411 | void Sema::DefineInheritingConstructor(SourceLocation CurrentLocation, |
13412 | CXXConstructorDecl *Constructor) { |
13413 | CXXRecordDecl *ClassDecl = Constructor->getParent(); |
13414 | assert(Constructor->getInheritedConstructor() &&((void)0) |
13415 | !Constructor->doesThisDeclarationHaveABody() &&((void)0) |
13416 | !Constructor->isDeleted())((void)0); |
13417 | if (Constructor->willHaveBody() || Constructor->isInvalidDecl()) |
13418 | return; |
13419 | |
13420 | // Initializations are performed "as if by a defaulted default constructor", |
13421 | // so enter the appropriate scope. |
13422 | SynthesizedFunctionScope Scope(*this, Constructor); |
13423 | |
13424 | // The exception specification is needed because we are defining the |
13425 | // function. |
13426 | ResolveExceptionSpec(CurrentLocation, |
13427 | Constructor->getType()->castAs<FunctionProtoType>()); |
13428 | MarkVTableUsed(CurrentLocation, ClassDecl); |
13429 | |
13430 | // Add a context note for diagnostics produced after this point. |
13431 | Scope.addContextNote(CurrentLocation); |
13432 | |
13433 | ConstructorUsingShadowDecl *Shadow = |
13434 | Constructor->getInheritedConstructor().getShadowDecl(); |
13435 | CXXConstructorDecl *InheritedCtor = |
13436 | Constructor->getInheritedConstructor().getConstructor(); |
13437 | |
13438 | // [class.inhctor.init]p1: |
13439 | // initialization proceeds as if a defaulted default constructor is used to |
13440 | // initialize the D object and each base class subobject from which the |
13441 | // constructor was inherited |
13442 | |
13443 | InheritedConstructorInfo ICI(*this, CurrentLocation, Shadow); |
13444 | CXXRecordDecl *RD = Shadow->getParent(); |
13445 | SourceLocation InitLoc = Shadow->getLocation(); |
13446 | |
13447 | // Build explicit initializers for all base classes from which the |
13448 | // constructor was inherited. |
13449 | SmallVector<CXXCtorInitializer*, 8> Inits; |
13450 | for (bool VBase : {false, true}) { |
13451 | for (CXXBaseSpecifier &B : VBase ? RD->vbases() : RD->bases()) { |
13452 | if (B.isVirtual() != VBase) |
13453 | continue; |
13454 | |
13455 | auto *BaseRD = B.getType()->getAsCXXRecordDecl(); |
13456 | if (!BaseRD) |
13457 | continue; |
13458 | |
13459 | auto BaseCtor = ICI.findConstructorForBase(BaseRD, InheritedCtor); |
13460 | if (!BaseCtor.first) |
13461 | continue; |
13462 | |
13463 | MarkFunctionReferenced(CurrentLocation, BaseCtor.first); |
13464 | ExprResult Init = new (Context) CXXInheritedCtorInitExpr( |
13465 | InitLoc, B.getType(), BaseCtor.first, VBase, BaseCtor.second); |
13466 | |
13467 | auto *TInfo = Context.getTrivialTypeSourceInfo(B.getType(), InitLoc); |
13468 | Inits.push_back(new (Context) CXXCtorInitializer( |
13469 | Context, TInfo, VBase, InitLoc, Init.get(), InitLoc, |
13470 | SourceLocation())); |
13471 | } |
13472 | } |
13473 | |
13474 | // We now proceed as if for a defaulted default constructor, with the relevant |
13475 | // initializers replaced. |
13476 | |
13477 | if (SetCtorInitializers(Constructor, /*AnyErrors*/false, Inits)) { |
13478 | Constructor->setInvalidDecl(); |
13479 | return; |
13480 | } |
13481 | |
13482 | Constructor->setBody(new (Context) CompoundStmt(InitLoc)); |
13483 | Constructor->markUsed(Context); |
13484 | |
13485 | if (ASTMutationListener *L = getASTMutationListener()) { |
13486 | L->CompletedImplicitDefinition(Constructor); |
13487 | } |
13488 | |
13489 | DiagnoseUninitializedFields(*this, Constructor); |
13490 | } |
13491 | |
13492 | CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { |
13493 | // C++ [class.dtor]p2: |
13494 | // If a class has no user-declared destructor, a destructor is |
13495 | // declared implicitly. An implicitly-declared destructor is an |
13496 | // inline public member of its class. |
13497 | assert(ClassDecl->needsImplicitDestructor())((void)0); |
13498 | |
13499 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor); |
13500 | if (DSM.isAlreadyBeingDeclared()) |
13501 | return nullptr; |
13502 | |
13503 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, |
13504 | CXXDestructor, |
13505 | false); |
13506 | |
13507 | // Create the actual destructor declaration. |
13508 | CanQualType ClassType |
13509 | = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); |
13510 | SourceLocation ClassLoc = ClassDecl->getLocation(); |
13511 | DeclarationName Name |
13512 | = Context.DeclarationNames.getCXXDestructorName(ClassType); |
13513 | DeclarationNameInfo NameInfo(Name, ClassLoc); |
13514 | CXXDestructorDecl *Destructor = |
13515 | CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, |
13516 | QualType(), nullptr, /*isInline=*/true, |
13517 | /*isImplicitlyDeclared=*/true, |
13518 | Constexpr ? ConstexprSpecKind::Constexpr |
13519 | : ConstexprSpecKind::Unspecified); |
13520 | Destructor->setAccess(AS_public); |
13521 | Destructor->setDefaulted(); |
13522 | |
13523 | if (getLangOpts().CUDA) { |
13524 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXDestructor, |
13525 | Destructor, |
13526 | /* ConstRHS */ false, |
13527 | /* Diagnose */ false); |
13528 | } |
13529 | |
13530 | setupImplicitSpecialMemberType(Destructor, Context.VoidTy, None); |
13531 | |
13532 | // We don't need to use SpecialMemberIsTrivial here; triviality for |
13533 | // destructors is easy to compute. |
13534 | Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); |
13535 | Destructor->setTrivialForCall(ClassDecl->hasAttr<TrivialABIAttr>() || |
13536 | ClassDecl->hasTrivialDestructorForCall()); |
13537 | |
13538 | // Note that we have declared this destructor. |
13539 | ++getASTContext().NumImplicitDestructorsDeclared; |
13540 | |
13541 | Scope *S = getScopeForContext(ClassDecl); |
13542 | CheckImplicitSpecialMemberDeclaration(S, Destructor); |
13543 | |
13544 | // We can't check whether an implicit destructor is deleted before we complete |
13545 | // the definition of the class, because its validity depends on the alignment |
13546 | // of the class. We'll check this from ActOnFields once the class is complete. |
13547 | if (ClassDecl->isCompleteDefinition() && |
13548 | ShouldDeleteSpecialMember(Destructor, CXXDestructor)) |
13549 | SetDeclDeleted(Destructor, ClassLoc); |
13550 | |
13551 | // Introduce this destructor into its scope. |
13552 | if (S) |
13553 | PushOnScopeChains(Destructor, S, false); |
13554 | ClassDecl->addDecl(Destructor); |
13555 | |
13556 | return Destructor; |
13557 | } |
13558 | |
13559 | void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, |
13560 | CXXDestructorDecl *Destructor) { |
13561 | assert((Destructor->isDefaulted() &&((void)0) |
13562 | !Destructor->doesThisDeclarationHaveABody() &&((void)0) |
13563 | !Destructor->isDeleted()) &&((void)0) |
13564 | "DefineImplicitDestructor - call it for implicit default dtor")((void)0); |
13565 | if (Destructor->willHaveBody() || Destructor->isInvalidDecl()) |
13566 | return; |
13567 | |
13568 | CXXRecordDecl *ClassDecl = Destructor->getParent(); |
13569 | assert(ClassDecl && "DefineImplicitDestructor - invalid destructor")((void)0); |
13570 | |
13571 | SynthesizedFunctionScope Scope(*this, Destructor); |
13572 | |
13573 | // The exception specification is needed because we are defining the |
13574 | // function. |
13575 | ResolveExceptionSpec(CurrentLocation, |
13576 | Destructor->getType()->castAs<FunctionProtoType>()); |
13577 | MarkVTableUsed(CurrentLocation, ClassDecl); |
13578 | |
13579 | // Add a context note for diagnostics produced after this point. |
13580 | Scope.addContextNote(CurrentLocation); |
13581 | |
13582 | MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), |
13583 | Destructor->getParent()); |
13584 | |
13585 | if (CheckDestructor(Destructor)) { |
13586 | Destructor->setInvalidDecl(); |
13587 | return; |
13588 | } |
13589 | |
13590 | SourceLocation Loc = Destructor->getEndLoc().isValid() |
13591 | ? Destructor->getEndLoc() |
13592 | : Destructor->getLocation(); |
13593 | Destructor->setBody(new (Context) CompoundStmt(Loc)); |
13594 | Destructor->markUsed(Context); |
13595 | |
13596 | if (ASTMutationListener *L = getASTMutationListener()) { |
13597 | L->CompletedImplicitDefinition(Destructor); |
13598 | } |
13599 | } |
13600 | |
13601 | void Sema::CheckCompleteDestructorVariant(SourceLocation CurrentLocation, |
13602 | CXXDestructorDecl *Destructor) { |
13603 | if (Destructor->isInvalidDecl()) |
13604 | return; |
13605 | |
13606 | CXXRecordDecl *ClassDecl = Destructor->getParent(); |
13607 | assert(Context.getTargetInfo().getCXXABI().isMicrosoft() &&((void)0) |
13608 | "implicit complete dtors unneeded outside MS ABI")((void)0); |
13609 | assert(ClassDecl->getNumVBases() > 0 &&((void)0) |
13610 | "complete dtor only exists for classes with vbases")((void)0); |
13611 | |
13612 | SynthesizedFunctionScope Scope(*this, Destructor); |
13613 | |
13614 | // Add a context note for diagnostics produced after this point. |
13615 | Scope.addContextNote(CurrentLocation); |
13616 | |
13617 | MarkVirtualBaseDestructorsReferenced(Destructor->getLocation(), ClassDecl); |
13618 | } |
13619 | |
13620 | /// Perform any semantic analysis which needs to be delayed until all |
13621 | /// pending class member declarations have been parsed. |
13622 | void Sema::ActOnFinishCXXMemberDecls() { |
13623 | // If the context is an invalid C++ class, just suppress these checks. |
13624 | if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(CurContext)) { |
13625 | if (Record->isInvalidDecl()) { |
13626 | DelayedOverridingExceptionSpecChecks.clear(); |
13627 | DelayedEquivalentExceptionSpecChecks.clear(); |
13628 | return; |
13629 | } |
13630 | checkForMultipleExportedDefaultConstructors(*this, Record); |
13631 | } |
13632 | } |
13633 | |
13634 | void Sema::ActOnFinishCXXNonNestedClass() { |
13635 | referenceDLLExportedClassMethods(); |
13636 | |
13637 | if (!DelayedDllExportMemberFunctions.empty()) { |
13638 | SmallVector<CXXMethodDecl*, 4> WorkList; |
13639 | std::swap(DelayedDllExportMemberFunctions, WorkList); |
13640 | for (CXXMethodDecl *M : WorkList) { |
13641 | DefineDefaultedFunction(*this, M, M->getLocation()); |
13642 | |
13643 | // Pass the method to the consumer to get emitted. This is not necessary |
13644 | // for explicit instantiation definitions, as they will get emitted |
13645 | // anyway. |
13646 | if (M->getParent()->getTemplateSpecializationKind() != |
13647 | TSK_ExplicitInstantiationDefinition) |
13648 | ActOnFinishInlineFunctionDef(M); |
13649 | } |
13650 | } |
13651 | } |
13652 | |
13653 | void Sema::referenceDLLExportedClassMethods() { |
13654 | if (!DelayedDllExportClasses.empty()) { |
13655 | // Calling ReferenceDllExportedMembers might cause the current function to |
13656 | // be called again, so use a local copy of DelayedDllExportClasses. |
13657 | SmallVector<CXXRecordDecl *, 4> WorkList; |
13658 | std::swap(DelayedDllExportClasses, WorkList); |
13659 | for (CXXRecordDecl *Class : WorkList) |
13660 | ReferenceDllExportedMembers(*this, Class); |
13661 | } |
13662 | } |
13663 | |
13664 | void Sema::AdjustDestructorExceptionSpec(CXXDestructorDecl *Destructor) { |
13665 | assert(getLangOpts().CPlusPlus11 &&((void)0) |
13666 | "adjusting dtor exception specs was introduced in c++11")((void)0); |
13667 | |
13668 | if (Destructor->isDependentContext()) |
13669 | return; |
13670 | |
13671 | // C++11 [class.dtor]p3: |
13672 | // A declaration of a destructor that does not have an exception- |
13673 | // specification is implicitly considered to have the same exception- |
13674 | // specification as an implicit declaration. |
13675 | const auto *DtorType = Destructor->getType()->castAs<FunctionProtoType>(); |
13676 | if (DtorType->hasExceptionSpec()) |
13677 | return; |
13678 | |
13679 | // Replace the destructor's type, building off the existing one. Fortunately, |
13680 | // the only thing of interest in the destructor type is its extended info. |
13681 | // The return and arguments are fixed. |
13682 | FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); |
13683 | EPI.ExceptionSpec.Type = EST_Unevaluated; |
13684 | EPI.ExceptionSpec.SourceDecl = Destructor; |
13685 | Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); |
13686 | |
13687 | // FIXME: If the destructor has a body that could throw, and the newly created |
13688 | // spec doesn't allow exceptions, we should emit a warning, because this |
13689 | // change in behavior can break conforming C++03 programs at runtime. |
13690 | // However, we don't have a body or an exception specification yet, so it |
13691 | // needs to be done somewhere else. |
13692 | } |
13693 | |
13694 | namespace { |
13695 | /// An abstract base class for all helper classes used in building the |
13696 | // copy/move operators. These classes serve as factory functions and help us |
13697 | // avoid using the same Expr* in the AST twice. |
13698 | class ExprBuilder { |
13699 | ExprBuilder(const ExprBuilder&) = delete; |
13700 | ExprBuilder &operator=(const ExprBuilder&) = delete; |
13701 | |
13702 | protected: |
13703 | static Expr *assertNotNull(Expr *E) { |
13704 | assert(E && "Expression construction must not fail.")((void)0); |
13705 | return E; |
13706 | } |
13707 | |
13708 | public: |
13709 | ExprBuilder() {} |
13710 | virtual ~ExprBuilder() {} |
13711 | |
13712 | virtual Expr *build(Sema &S, SourceLocation Loc) const = 0; |
13713 | }; |
13714 | |
13715 | class RefBuilder: public ExprBuilder { |
13716 | VarDecl *Var; |
13717 | QualType VarType; |
13718 | |
13719 | public: |
13720 | Expr *build(Sema &S, SourceLocation Loc) const override { |
13721 | return assertNotNull(S.BuildDeclRefExpr(Var, VarType, VK_LValue, Loc)); |
13722 | } |
13723 | |
13724 | RefBuilder(VarDecl *Var, QualType VarType) |
13725 | : Var(Var), VarType(VarType) {} |
13726 | }; |
13727 | |
13728 | class ThisBuilder: public ExprBuilder { |
13729 | public: |
13730 | Expr *build(Sema &S, SourceLocation Loc) const override { |
13731 | return assertNotNull(S.ActOnCXXThis(Loc).getAs<Expr>()); |
13732 | } |
13733 | }; |
13734 | |
13735 | class CastBuilder: public ExprBuilder { |
13736 | const ExprBuilder &Builder; |
13737 | QualType Type; |
13738 | ExprValueKind Kind; |
13739 | const CXXCastPath &Path; |
13740 | |
13741 | public: |
13742 | Expr *build(Sema &S, SourceLocation Loc) const override { |
13743 | return assertNotNull(S.ImpCastExprToType(Builder.build(S, Loc), Type, |
13744 | CK_UncheckedDerivedToBase, Kind, |
13745 | &Path).get()); |
13746 | } |
13747 | |
13748 | CastBuilder(const ExprBuilder &Builder, QualType Type, ExprValueKind Kind, |
13749 | const CXXCastPath &Path) |
13750 | : Builder(Builder), Type(Type), Kind(Kind), Path(Path) {} |
13751 | }; |
13752 | |
13753 | class DerefBuilder: public ExprBuilder { |
13754 | const ExprBuilder &Builder; |
13755 | |
13756 | public: |
13757 | Expr *build(Sema &S, SourceLocation Loc) const override { |
13758 | return assertNotNull( |
13759 | S.CreateBuiltinUnaryOp(Loc, UO_Deref, Builder.build(S, Loc)).get()); |
13760 | } |
13761 | |
13762 | DerefBuilder(const ExprBuilder &Builder) : Builder(Builder) {} |
13763 | }; |
13764 | |
13765 | class MemberBuilder: public ExprBuilder { |
13766 | const ExprBuilder &Builder; |
13767 | QualType Type; |
13768 | CXXScopeSpec SS; |
13769 | bool IsArrow; |
13770 | LookupResult &MemberLookup; |
13771 | |
13772 | public: |
13773 | Expr *build(Sema &S, SourceLocation Loc) const override { |
13774 | return assertNotNull(S.BuildMemberReferenceExpr( |
13775 | Builder.build(S, Loc), Type, Loc, IsArrow, SS, SourceLocation(), |
13776 | nullptr, MemberLookup, nullptr, nullptr).get()); |
13777 | } |
13778 | |
13779 | MemberBuilder(const ExprBuilder &Builder, QualType Type, bool IsArrow, |
13780 | LookupResult &MemberLookup) |
13781 | : Builder(Builder), Type(Type), IsArrow(IsArrow), |
13782 | MemberLookup(MemberLookup) {} |
13783 | }; |
13784 | |
13785 | class MoveCastBuilder: public ExprBuilder { |
13786 | const ExprBuilder &Builder; |
13787 | |
13788 | public: |
13789 | Expr *build(Sema &S, SourceLocation Loc) const override { |
13790 | return assertNotNull(CastForMoving(S, Builder.build(S, Loc))); |
13791 | } |
13792 | |
13793 | MoveCastBuilder(const ExprBuilder &Builder) : Builder(Builder) {} |
13794 | }; |
13795 | |
13796 | class LvalueConvBuilder: public ExprBuilder { |
13797 | const ExprBuilder &Builder; |
13798 | |
13799 | public: |
13800 | Expr *build(Sema &S, SourceLocation Loc) const override { |
13801 | return assertNotNull( |
13802 | S.DefaultLvalueConversion(Builder.build(S, Loc)).get()); |
13803 | } |
13804 | |
13805 | LvalueConvBuilder(const ExprBuilder &Builder) : Builder(Builder) {} |
13806 | }; |
13807 | |
13808 | class SubscriptBuilder: public ExprBuilder { |
13809 | const ExprBuilder &Base; |
13810 | const ExprBuilder &Index; |
13811 | |
13812 | public: |
13813 | Expr *build(Sema &S, SourceLocation Loc) const override { |
13814 | return assertNotNull(S.CreateBuiltinArraySubscriptExpr( |
13815 | Base.build(S, Loc), Loc, Index.build(S, Loc), Loc).get()); |
13816 | } |
13817 | |
13818 | SubscriptBuilder(const ExprBuilder &Base, const ExprBuilder &Index) |
13819 | : Base(Base), Index(Index) {} |
13820 | }; |
13821 | |
13822 | } // end anonymous namespace |
13823 | |
13824 | /// When generating a defaulted copy or move assignment operator, if a field |
13825 | /// should be copied with __builtin_memcpy rather than via explicit assignments, |
13826 | /// do so. This optimization only applies for arrays of scalars, and for arrays |
13827 | /// of class type where the selected copy/move-assignment operator is trivial. |
13828 | static StmtResult |
13829 | buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T, |
13830 | const ExprBuilder &ToB, const ExprBuilder &FromB) { |
13831 | // Compute the size of the memory buffer to be copied. |
13832 | QualType SizeType = S.Context.getSizeType(); |
13833 | llvm::APInt Size(S.Context.getTypeSize(SizeType), |
13834 | S.Context.getTypeSizeInChars(T).getQuantity()); |
13835 | |
13836 | // Take the address of the field references for "from" and "to". We |
13837 | // directly construct UnaryOperators here because semantic analysis |
13838 | // does not permit us to take the address of an xvalue. |
13839 | Expr *From = FromB.build(S, Loc); |
13840 | From = UnaryOperator::Create( |
13841 | S.Context, From, UO_AddrOf, S.Context.getPointerType(From->getType()), |
13842 | VK_PRValue, OK_Ordinary, Loc, false, S.CurFPFeatureOverrides()); |
13843 | Expr *To = ToB.build(S, Loc); |
13844 | To = UnaryOperator::Create( |
13845 | S.Context, To, UO_AddrOf, S.Context.getPointerType(To->getType()), |
13846 | VK_PRValue, OK_Ordinary, Loc, false, S.CurFPFeatureOverrides()); |
13847 | |
13848 | const Type *E = T->getBaseElementTypeUnsafe(); |
13849 | bool NeedsCollectableMemCpy = |
13850 | E->isRecordType() && |
13851 | E->castAs<RecordType>()->getDecl()->hasObjectMember(); |
13852 | |
13853 | // Create a reference to the __builtin_objc_memmove_collectable function |
13854 | StringRef MemCpyName = NeedsCollectableMemCpy ? |
13855 | "__builtin_objc_memmove_collectable" : |
13856 | "__builtin_memcpy"; |
13857 | LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc, |
13858 | Sema::LookupOrdinaryName); |
13859 | S.LookupName(R, S.TUScope, true); |
13860 | |
13861 | FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>(); |
13862 | if (!MemCpy) |
13863 | // Something went horribly wrong earlier, and we will have complained |
13864 | // about it. |
13865 | return StmtError(); |
13866 | |
13867 | ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy, |
13868 | VK_PRValue, Loc, nullptr); |
13869 | assert(MemCpyRef.isUsable() && "Builtin reference cannot fail")((void)0); |
13870 | |
13871 | Expr *CallArgs[] = { |
13872 | To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc) |
13873 | }; |
13874 | ExprResult Call = S.BuildCallExpr(/*Scope=*/nullptr, MemCpyRef.get(), |
13875 | Loc, CallArgs, Loc); |
13876 | |
13877 | assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!")((void)0); |
13878 | return Call.getAs<Stmt>(); |
13879 | } |
13880 | |
13881 | /// Builds a statement that copies/moves the given entity from \p From to |
13882 | /// \c To. |
13883 | /// |
13884 | /// This routine is used to copy/move the members of a class with an |
13885 | /// implicitly-declared copy/move assignment operator. When the entities being |
13886 | /// copied are arrays, this routine builds for loops to copy them. |
13887 | /// |
13888 | /// \param S The Sema object used for type-checking. |
13889 | /// |
13890 | /// \param Loc The location where the implicit copy/move is being generated. |
13891 | /// |
13892 | /// \param T The type of the expressions being copied/moved. Both expressions |
13893 | /// must have this type. |
13894 | /// |
13895 | /// \param To The expression we are copying/moving to. |
13896 | /// |
13897 | /// \param From The expression we are copying/moving from. |
13898 | /// |
13899 | /// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. |
13900 | /// Otherwise, it's a non-static member subobject. |
13901 | /// |
13902 | /// \param Copying Whether we're copying or moving. |
13903 | /// |
13904 | /// \param Depth Internal parameter recording the depth of the recursion. |
13905 | /// |
13906 | /// \returns A statement or a loop that copies the expressions, or StmtResult(0) |
13907 | /// if a memcpy should be used instead. |
13908 | static StmtResult |
13909 | buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T, |
13910 | const ExprBuilder &To, const ExprBuilder &From, |
13911 | bool CopyingBaseSubobject, bool Copying, |
13912 | unsigned Depth = 0) { |
13913 | // C++11 [class.copy]p28: |
13914 | // Each subobject is assigned in the manner appropriate to its type: |
13915 | // |
13916 | // - if the subobject is of class type, as if by a call to operator= with |
13917 | // the subobject as the object expression and the corresponding |
13918 | // subobject of x as a single function argument (as if by explicit |
13919 | // qualification; that is, ignoring any possible virtual overriding |
13920 | // functions in more derived classes); |
13921 | // |
13922 | // C++03 [class.copy]p13: |
13923 | // - if the subobject is of class type, the copy assignment operator for |
13924 | // the class is used (as if by explicit qualification; that is, |
13925 | // ignoring any possible virtual overriding functions in more derived |
13926 | // classes); |
13927 | if (const RecordType *RecordTy = T->getAs<RecordType>()) { |
13928 | CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); |
13929 | |
13930 | // Look for operator=. |
13931 | DeclarationName Name |
13932 | = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); |
13933 | LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); |
13934 | S.LookupQualifiedName(OpLookup, ClassDecl, false); |
13935 | |
13936 | // Prior to C++11, filter out any result that isn't a copy/move-assignment |
13937 | // operator. |
13938 | if (!S.getLangOpts().CPlusPlus11) { |
13939 | LookupResult::Filter F = OpLookup.makeFilter(); |
13940 | while (F.hasNext()) { |
13941 | NamedDecl *D = F.next(); |
13942 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) |
13943 | if (Method->isCopyAssignmentOperator() || |
13944 | (!Copying && Method->isMoveAssignmentOperator())) |
13945 | continue; |
13946 | |
13947 | F.erase(); |
13948 | } |
13949 | F.done(); |
13950 | } |
13951 | |
13952 | // Suppress the protected check (C++ [class.protected]) for each of the |
13953 | // assignment operators we found. This strange dance is required when |
13954 | // we're assigning via a base classes's copy-assignment operator. To |
13955 | // ensure that we're getting the right base class subobject (without |
13956 | // ambiguities), we need to cast "this" to that subobject type; to |
13957 | // ensure that we don't go through the virtual call mechanism, we need |
13958 | // to qualify the operator= name with the base class (see below). However, |
13959 | // this means that if the base class has a protected copy assignment |
13960 | // operator, the protected member access check will fail. So, we |
13961 | // rewrite "protected" access to "public" access in this case, since we |
13962 | // know by construction that we're calling from a derived class. |
13963 | if (CopyingBaseSubobject) { |
13964 | for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); |
13965 | L != LEnd; ++L) { |
13966 | if (L.getAccess() == AS_protected) |
13967 | L.setAccess(AS_public); |
13968 | } |
13969 | } |
13970 | |
13971 | // Create the nested-name-specifier that will be used to qualify the |
13972 | // reference to operator=; this is required to suppress the virtual |
13973 | // call mechanism. |
13974 | CXXScopeSpec SS; |
13975 | const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); |
13976 | SS.MakeTrivial(S.Context, |
13977 | NestedNameSpecifier::Create(S.Context, nullptr, false, |
13978 | CanonicalT), |
13979 | Loc); |
13980 | |
13981 | // Create the reference to operator=. |
13982 | ExprResult OpEqualRef |
13983 | = S.BuildMemberReferenceExpr(To.build(S, Loc), T, Loc, /*IsArrow=*/false, |
13984 | SS, /*TemplateKWLoc=*/SourceLocation(), |
13985 | /*FirstQualifierInScope=*/nullptr, |
13986 | OpLookup, |
13987 | /*TemplateArgs=*/nullptr, /*S*/nullptr, |
13988 | /*SuppressQualifierCheck=*/true); |
13989 | if (OpEqualRef.isInvalid()) |
13990 | return StmtError(); |
13991 | |
13992 | // Build the call to the assignment operator. |
13993 | |
13994 | Expr *FromInst = From.build(S, Loc); |
13995 | ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/nullptr, |
13996 | OpEqualRef.getAs<Expr>(), |
13997 | Loc, FromInst, Loc); |
13998 | if (Call.isInvalid()) |
13999 | return StmtError(); |
14000 | |
14001 | // If we built a call to a trivial 'operator=' while copying an array, |
14002 | // bail out. We'll replace the whole shebang with a memcpy. |
14003 | CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get()); |
14004 | if (CE && CE->getMethodDecl()->isTrivial() && Depth) |
14005 | return StmtResult((Stmt*)nullptr); |
14006 | |
14007 | // Convert to an expression-statement, and clean up any produced |
14008 | // temporaries. |
14009 | return S.ActOnExprStmt(Call); |
14010 | } |
14011 | |
14012 | // - if the subobject is of scalar type, the built-in assignment |
14013 | // operator is used. |
14014 | const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); |
14015 | if (!ArrayTy) { |
14016 | ExprResult Assignment = S.CreateBuiltinBinOp( |
14017 | Loc, BO_Assign, To.build(S, Loc), From.build(S, Loc)); |
14018 | if (Assignment.isInvalid()) |
14019 | return StmtError(); |
14020 | return S.ActOnExprStmt(Assignment); |
14021 | } |
14022 | |
14023 | // - if the subobject is an array, each element is assigned, in the |
14024 | // manner appropriate to the element type; |
14025 | |
14026 | // Construct a loop over the array bounds, e.g., |
14027 | // |
14028 | // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) |
14029 | // |
14030 | // that will copy each of the array elements. |
14031 | QualType SizeType = S.Context.getSizeType(); |
14032 | |
14033 | // Create the iteration variable. |
14034 | IdentifierInfo *IterationVarName = nullptr; |
14035 | { |
14036 | SmallString<8> Str; |
14037 | llvm::raw_svector_ostream OS(Str); |
14038 | OS << "__i" << Depth; |
14039 | IterationVarName = &S.Context.Idents.get(OS.str()); |
14040 | } |
14041 | VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, |
14042 | IterationVarName, SizeType, |
14043 | S.Context.getTrivialTypeSourceInfo(SizeType, Loc), |
14044 | SC_None); |
14045 | |
14046 | // Initialize the iteration variable to zero. |
14047 | llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); |
14048 | IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); |
14049 | |
14050 | // Creates a reference to the iteration variable. |
14051 | RefBuilder IterationVarRef(IterationVar, SizeType); |
14052 | LvalueConvBuilder IterationVarRefRVal(IterationVarRef); |
14053 | |
14054 | // Create the DeclStmt that holds the iteration variable. |
14055 | Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); |
14056 | |
14057 | // Subscript the "from" and "to" expressions with the iteration variable. |
14058 | SubscriptBuilder FromIndexCopy(From, IterationVarRefRVal); |
14059 | MoveCastBuilder FromIndexMove(FromIndexCopy); |
14060 | const ExprBuilder *FromIndex; |
14061 | if (Copying) |
14062 | FromIndex = &FromIndexCopy; |
14063 | else |
14064 | FromIndex = &FromIndexMove; |
14065 | |
14066 | SubscriptBuilder ToIndex(To, IterationVarRefRVal); |
14067 | |
14068 | // Build the copy/move for an individual element of the array. |
14069 | StmtResult Copy = |
14070 | buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(), |
14071 | ToIndex, *FromIndex, CopyingBaseSubobject, |
14072 | Copying, Depth + 1); |
14073 | // Bail out if copying fails or if we determined that we should use memcpy. |
14074 | if (Copy.isInvalid() || !Copy.get()) |
14075 | return Copy; |
14076 | |
14077 | // Create the comparison against the array bound. |
14078 | llvm::APInt Upper |
14079 | = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); |
14080 | Expr *Comparison = BinaryOperator::Create( |
14081 | S.Context, IterationVarRefRVal.build(S, Loc), |
14082 | IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), BO_NE, |
14083 | S.Context.BoolTy, VK_PRValue, OK_Ordinary, Loc, |
14084 | S.CurFPFeatureOverrides()); |
14085 | |
14086 | // Create the pre-increment of the iteration variable. We can determine |
14087 | // whether the increment will overflow based on the value of the array |
14088 | // bound. |
14089 | Expr *Increment = UnaryOperator::Create( |
14090 | S.Context, IterationVarRef.build(S, Loc), UO_PreInc, SizeType, VK_LValue, |
14091 | OK_Ordinary, Loc, Upper.isMaxValue(), S.CurFPFeatureOverrides()); |
14092 | |
14093 | // Construct the loop that copies all elements of this array. |
14094 | return S.ActOnForStmt( |
14095 | Loc, Loc, InitStmt, |
14096 | S.ActOnCondition(nullptr, Loc, Comparison, Sema::ConditionKind::Boolean), |
14097 | S.MakeFullDiscardedValueExpr(Increment), Loc, Copy.get()); |
14098 | } |
14099 | |
14100 | static StmtResult |
14101 | buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, |
14102 | const ExprBuilder &To, const ExprBuilder &From, |
14103 | bool CopyingBaseSubobject, bool Copying) { |
14104 | // Maybe we should use a memcpy? |
14105 | if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() && |
14106 | T.isTriviallyCopyableType(S.Context)) |
14107 | return buildMemcpyForAssignmentOp(S, Loc, T, To, From); |
14108 | |
14109 | StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From, |
14110 | CopyingBaseSubobject, |
14111 | Copying, 0)); |
14112 | |
14113 | // If we ended up picking a trivial assignment operator for an array of a |
14114 | // non-trivially-copyable class type, just emit a memcpy. |
14115 | if (!Result.isInvalid() && !Result.get()) |
14116 | return buildMemcpyForAssignmentOp(S, Loc, T, To, From); |
14117 | |
14118 | return Result; |
14119 | } |
14120 | |
14121 | CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { |
14122 | // Note: The following rules are largely analoguous to the copy |
14123 | // constructor rules. Note that virtual bases are not taken into account |
14124 | // for determining the argument type of the operator. Note also that |
14125 | // operators taking an object instead of a reference are allowed. |
14126 | assert(ClassDecl->needsImplicitCopyAssignment())((void)0); |
14127 | |
14128 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment); |
14129 | if (DSM.isAlreadyBeingDeclared()) |
14130 | return nullptr; |
14131 | |
14132 | QualType ArgType = Context.getTypeDeclType(ClassDecl); |
14133 | LangAS AS = getDefaultCXXMethodAddrSpace(); |
14134 | if (AS != LangAS::Default) |
14135 | ArgType = Context.getAddrSpaceQualType(ArgType, AS); |
14136 | QualType RetType = Context.getLValueReferenceType(ArgType); |
14137 | bool Const = ClassDecl->implicitCopyAssignmentHasConstParam(); |
14138 | if (Const) |
14139 | ArgType = ArgType.withConst(); |
14140 | |
14141 | ArgType = Context.getLValueReferenceType(ArgType); |
14142 | |
14143 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, |
14144 | CXXCopyAssignment, |
14145 | Const); |
14146 | |
14147 | // An implicitly-declared copy assignment operator is an inline public |
14148 | // member of its class. |
14149 | DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); |
14150 | SourceLocation ClassLoc = ClassDecl->getLocation(); |
14151 | DeclarationNameInfo NameInfo(Name, ClassLoc); |
14152 | CXXMethodDecl *CopyAssignment = CXXMethodDecl::Create( |
14153 | Context, ClassDecl, ClassLoc, NameInfo, QualType(), |
14154 | /*TInfo=*/nullptr, /*StorageClass=*/SC_None, |
14155 | /*isInline=*/true, |
14156 | Constexpr ? ConstexprSpecKind::Constexpr : ConstexprSpecKind::Unspecified, |
14157 | SourceLocation()); |
14158 | CopyAssignment->setAccess(AS_public); |
14159 | CopyAssignment->setDefaulted(); |
14160 | CopyAssignment->setImplicit(); |
14161 | |
14162 | if (getLangOpts().CUDA) { |
14163 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXCopyAssignment, |
14164 | CopyAssignment, |
14165 | /* ConstRHS */ Const, |
14166 | /* Diagnose */ false); |
14167 | } |
14168 | |
14169 | setupImplicitSpecialMemberType(CopyAssignment, RetType, ArgType); |
14170 | |
14171 | // Add the parameter to the operator. |
14172 | ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, |
14173 | ClassLoc, ClassLoc, |
14174 | /*Id=*/nullptr, ArgType, |
14175 | /*TInfo=*/nullptr, SC_None, |
14176 | nullptr); |
14177 | CopyAssignment->setParams(FromParam); |
14178 | |
14179 | CopyAssignment->setTrivial( |
14180 | ClassDecl->needsOverloadResolutionForCopyAssignment() |
14181 | ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment) |
14182 | : ClassDecl->hasTrivialCopyAssignment()); |
14183 | |
14184 | // Note that we have added this copy-assignment operator. |
14185 | ++getASTContext().NumImplicitCopyAssignmentOperatorsDeclared; |
14186 | |
14187 | Scope *S = getScopeForContext(ClassDecl); |
14188 | CheckImplicitSpecialMemberDeclaration(S, CopyAssignment); |
14189 | |
14190 | if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) { |
14191 | ClassDecl->setImplicitCopyAssignmentIsDeleted(); |
14192 | SetDeclDeleted(CopyAssignment, ClassLoc); |
14193 | } |
14194 | |
14195 | if (S) |
14196 | PushOnScopeChains(CopyAssignment, S, false); |
14197 | ClassDecl->addDecl(CopyAssignment); |
14198 | |
14199 | return CopyAssignment; |
14200 | } |
14201 | |
14202 | /// Diagnose an implicit copy operation for a class which is odr-used, but |
14203 | /// which is deprecated because the class has a user-declared copy constructor, |
14204 | /// copy assignment operator, or destructor. |
14205 | static void diagnoseDeprecatedCopyOperation(Sema &S, CXXMethodDecl *CopyOp) { |
14206 | assert(CopyOp->isImplicit())((void)0); |
14207 | |
14208 | CXXRecordDecl *RD = CopyOp->getParent(); |
14209 | CXXMethodDecl *UserDeclaredOperation = nullptr; |
14210 | |
14211 | // In Microsoft mode, assignment operations don't affect constructors and |
14212 | // vice versa. |
14213 | if (RD->hasUserDeclaredDestructor()) { |
14214 | UserDeclaredOperation = RD->getDestructor(); |
14215 | } else if (!isa<CXXConstructorDecl>(CopyOp) && |
14216 | RD->hasUserDeclaredCopyConstructor() && |
14217 | !S.getLangOpts().MSVCCompat) { |
14218 | // Find any user-declared copy constructor. |
14219 | for (auto *I : RD->ctors()) { |
14220 | if (I->isCopyConstructor()) { |
14221 | UserDeclaredOperation = I; |
14222 | break; |
14223 | } |
14224 | } |
14225 | assert(UserDeclaredOperation)((void)0); |
14226 | } else if (isa<CXXConstructorDecl>(CopyOp) && |
14227 | RD->hasUserDeclaredCopyAssignment() && |
14228 | !S.getLangOpts().MSVCCompat) { |
14229 | // Find any user-declared move assignment operator. |
14230 | for (auto *I : RD->methods()) { |
14231 | if (I->isCopyAssignmentOperator()) { |
14232 | UserDeclaredOperation = I; |
14233 | break; |
14234 | } |
14235 | } |
14236 | assert(UserDeclaredOperation)((void)0); |
14237 | } |
14238 | |
14239 | if (UserDeclaredOperation) { |
14240 | bool UDOIsUserProvided = UserDeclaredOperation->isUserProvided(); |
14241 | bool UDOIsDestructor = isa<CXXDestructorDecl>(UserDeclaredOperation); |
14242 | bool IsCopyAssignment = !isa<CXXConstructorDecl>(CopyOp); |
14243 | unsigned DiagID = |
14244 | (UDOIsUserProvided && UDOIsDestructor) |
14245 | ? diag::warn_deprecated_copy_with_user_provided_dtor |
14246 | : (UDOIsUserProvided && !UDOIsDestructor) |
14247 | ? diag::warn_deprecated_copy_with_user_provided_copy |
14248 | : (!UDOIsUserProvided && UDOIsDestructor) |
14249 | ? diag::warn_deprecated_copy_with_dtor |
14250 | : diag::warn_deprecated_copy; |
14251 | S.Diag(UserDeclaredOperation->getLocation(), DiagID) |
14252 | << RD << IsCopyAssignment; |
14253 | } |
14254 | } |
14255 | |
14256 | void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, |
14257 | CXXMethodDecl *CopyAssignOperator) { |
14258 | assert((CopyAssignOperator->isDefaulted() &&((void)0) |
14259 | CopyAssignOperator->isOverloadedOperator() &&((void)0) |
14260 | CopyAssignOperator->getOverloadedOperator() == OO_Equal &&((void)0) |
14261 | !CopyAssignOperator->doesThisDeclarationHaveABody() &&((void)0) |
14262 | !CopyAssignOperator->isDeleted()) &&((void)0) |
14263 | "DefineImplicitCopyAssignment called for wrong function")((void)0); |
14264 | if (CopyAssignOperator->willHaveBody() || CopyAssignOperator->isInvalidDecl()) |
14265 | return; |
14266 | |
14267 | CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); |
14268 | if (ClassDecl->isInvalidDecl()) { |
14269 | CopyAssignOperator->setInvalidDecl(); |
14270 | return; |
14271 | } |
14272 | |
14273 | SynthesizedFunctionScope Scope(*this, CopyAssignOperator); |
14274 | |
14275 | // The exception specification is needed because we are defining the |
14276 | // function. |
14277 | ResolveExceptionSpec(CurrentLocation, |
14278 | CopyAssignOperator->getType()->castAs<FunctionProtoType>()); |
14279 | |
14280 | // Add a context note for diagnostics produced after this point. |
14281 | Scope.addContextNote(CurrentLocation); |
14282 | |
14283 | // C++11 [class.copy]p18: |
14284 | // The [definition of an implicitly declared copy assignment operator] is |
14285 | // deprecated if the class has a user-declared copy constructor or a |
14286 | // user-declared destructor. |
14287 | if (getLangOpts().CPlusPlus11 && CopyAssignOperator->isImplicit()) |
14288 | diagnoseDeprecatedCopyOperation(*this, CopyAssignOperator); |
14289 | |
14290 | // C++0x [class.copy]p30: |
14291 | // The implicitly-defined or explicitly-defaulted copy assignment operator |
14292 | // for a non-union class X performs memberwise copy assignment of its |
14293 | // subobjects. The direct base classes of X are assigned first, in the |
14294 | // order of their declaration in the base-specifier-list, and then the |
14295 | // immediate non-static data members of X are assigned, in the order in |
14296 | // which they were declared in the class definition. |
14297 | |
14298 | // The statements that form the synthesized function body. |
14299 | SmallVector<Stmt*, 8> Statements; |
14300 | |
14301 | // The parameter for the "other" object, which we are copying from. |
14302 | ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); |
14303 | Qualifiers OtherQuals = Other->getType().getQualifiers(); |
14304 | QualType OtherRefType = Other->getType(); |
14305 | if (const LValueReferenceType *OtherRef |
14306 | = OtherRefType->getAs<LValueReferenceType>()) { |
14307 | OtherRefType = OtherRef->getPointeeType(); |
14308 | OtherQuals = OtherRefType.getQualifiers(); |
14309 | } |
14310 | |
14311 | // Our location for everything implicitly-generated. |
14312 | SourceLocation Loc = CopyAssignOperator->getEndLoc().isValid() |
14313 | ? CopyAssignOperator->getEndLoc() |
14314 | : CopyAssignOperator->getLocation(); |
14315 | |
14316 | // Builds a DeclRefExpr for the "other" object. |
14317 | RefBuilder OtherRef(Other, OtherRefType); |
14318 | |
14319 | // Builds the "this" pointer. |
14320 | ThisBuilder This; |
14321 | |
14322 | // Assign base classes. |
14323 | bool Invalid = false; |
14324 | for (auto &Base : ClassDecl->bases()) { |
14325 | // Form the assignment: |
14326 | // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); |
14327 | QualType BaseType = Base.getType().getUnqualifiedType(); |
14328 | if (!BaseType->isRecordType()) { |
14329 | Invalid = true; |
14330 | continue; |
14331 | } |
14332 | |
14333 | CXXCastPath BasePath; |
14334 | BasePath.push_back(&Base); |
14335 | |
14336 | // Construct the "from" expression, which is an implicit cast to the |
14337 | // appropriately-qualified base type. |
14338 | CastBuilder From(OtherRef, Context.getQualifiedType(BaseType, OtherQuals), |
14339 | VK_LValue, BasePath); |
14340 | |
14341 | // Dereference "this". |
14342 | DerefBuilder DerefThis(This); |
14343 | CastBuilder To(DerefThis, |
14344 | Context.getQualifiedType( |
14345 | BaseType, CopyAssignOperator->getMethodQualifiers()), |
14346 | VK_LValue, BasePath); |
14347 | |
14348 | // Build the copy. |
14349 | StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType, |
14350 | To, From, |
14351 | /*CopyingBaseSubobject=*/true, |
14352 | /*Copying=*/true); |
14353 | if (Copy.isInvalid()) { |
14354 | CopyAssignOperator->setInvalidDecl(); |
14355 | return; |
14356 | } |
14357 | |
14358 | // Success! Record the copy. |
14359 | Statements.push_back(Copy.getAs<Expr>()); |
14360 | } |
14361 | |
14362 | // Assign non-static members. |
14363 | for (auto *Field : ClassDecl->fields()) { |
14364 | // FIXME: We should form some kind of AST representation for the implied |
14365 | // memcpy in a union copy operation. |
14366 | if (Field->isUnnamedBitfield() || Field->getParent()->isUnion()) |
14367 | continue; |
14368 | |
14369 | if (Field->isInvalidDecl()) { |
14370 | Invalid = true; |
14371 | continue; |
14372 | } |
14373 | |
14374 | // Check for members of reference type; we can't copy those. |
14375 | if (Field->getType()->isReferenceType()) { |
14376 | Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) |
14377 | << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); |
14378 | Diag(Field->getLocation(), diag::note_declared_at); |
14379 | Invalid = true; |
14380 | continue; |
14381 | } |
14382 | |
14383 | // Check for members of const-qualified, non-class type. |
14384 | QualType BaseType = Context.getBaseElementType(Field->getType()); |
14385 | if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { |
14386 | Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) |
14387 | << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); |
14388 | Diag(Field->getLocation(), diag::note_declared_at); |
14389 | Invalid = true; |
14390 | continue; |
14391 | } |
14392 | |
14393 | // Suppress assigning zero-width bitfields. |
14394 | if (Field->isZeroLengthBitField(Context)) |
14395 | continue; |
14396 | |
14397 | QualType FieldType = Field->getType().getNonReferenceType(); |
14398 | if (FieldType->isIncompleteArrayType()) { |
14399 | assert(ClassDecl->hasFlexibleArrayMember() &&((void)0) |
14400 | "Incomplete array type is not valid")((void)0); |
14401 | continue; |
14402 | } |
14403 | |
14404 | // Build references to the field in the object we're copying from and to. |
14405 | CXXScopeSpec SS; // Intentionally empty |
14406 | LookupResult MemberLookup(*this, Field->getDeclName(), Loc, |
14407 | LookupMemberName); |
14408 | MemberLookup.addDecl(Field); |
14409 | MemberLookup.resolveKind(); |
14410 | |
14411 | MemberBuilder From(OtherRef, OtherRefType, /*IsArrow=*/false, MemberLookup); |
14412 | |
14413 | MemberBuilder To(This, getCurrentThisType(), /*IsArrow=*/true, MemberLookup); |
14414 | |
14415 | // Build the copy of this field. |
14416 | StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType, |
14417 | To, From, |
14418 | /*CopyingBaseSubobject=*/false, |
14419 | /*Copying=*/true); |
14420 | if (Copy.isInvalid()) { |
14421 | CopyAssignOperator->setInvalidDecl(); |
14422 | return; |
14423 | } |
14424 | |
14425 | // Success! Record the copy. |
14426 | Statements.push_back(Copy.getAs<Stmt>()); |
14427 | } |
14428 | |
14429 | if (!Invalid) { |
14430 | // Add a "return *this;" |
14431 | ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc)); |
14432 | |
14433 | StmtResult Return = BuildReturnStmt(Loc, ThisObj.get()); |
14434 | if (Return.isInvalid()) |
14435 | Invalid = true; |
14436 | else |
14437 | Statements.push_back(Return.getAs<Stmt>()); |
14438 | } |
14439 | |
14440 | if (Invalid) { |
14441 | CopyAssignOperator->setInvalidDecl(); |
14442 | return; |
14443 | } |
14444 | |
14445 | StmtResult Body; |
14446 | { |
14447 | CompoundScopeRAII CompoundScope(*this); |
14448 | Body = ActOnCompoundStmt(Loc, Loc, Statements, |
14449 | /*isStmtExpr=*/false); |
14450 | assert(!Body.isInvalid() && "Compound statement creation cannot fail")((void)0); |
14451 | } |
14452 | CopyAssignOperator->setBody(Body.getAs<Stmt>()); |
14453 | CopyAssignOperator->markUsed(Context); |
14454 | |
14455 | if (ASTMutationListener *L = getASTMutationListener()) { |
14456 | L->CompletedImplicitDefinition(CopyAssignOperator); |
14457 | } |
14458 | } |
14459 | |
14460 | CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { |
14461 | assert(ClassDecl->needsImplicitMoveAssignment())((void)0); |
14462 | |
14463 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment); |
14464 | if (DSM.isAlreadyBeingDeclared()) |
14465 | return nullptr; |
14466 | |
14467 | // Note: The following rules are largely analoguous to the move |
14468 | // constructor rules. |
14469 | |
14470 | QualType ArgType = Context.getTypeDeclType(ClassDecl); |
14471 | LangAS AS = getDefaultCXXMethodAddrSpace(); |
14472 | if (AS != LangAS::Default) |
14473 | ArgType = Context.getAddrSpaceQualType(ArgType, AS); |
14474 | QualType RetType = Context.getLValueReferenceType(ArgType); |
14475 | ArgType = Context.getRValueReferenceType(ArgType); |
14476 | |
14477 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, |
14478 | CXXMoveAssignment, |
14479 | false); |
14480 | |
14481 | // An implicitly-declared move assignment operator is an inline public |
14482 | // member of its class. |
14483 | DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); |
14484 | SourceLocation ClassLoc = ClassDecl->getLocation(); |
14485 | DeclarationNameInfo NameInfo(Name, ClassLoc); |
14486 | CXXMethodDecl *MoveAssignment = CXXMethodDecl::Create( |
14487 | Context, ClassDecl, ClassLoc, NameInfo, QualType(), |
14488 | /*TInfo=*/nullptr, /*StorageClass=*/SC_None, |
14489 | /*isInline=*/true, |
14490 | Constexpr ? ConstexprSpecKind::Constexpr : ConstexprSpecKind::Unspecified, |
14491 | SourceLocation()); |
14492 | MoveAssignment->setAccess(AS_public); |
14493 | MoveAssignment->setDefaulted(); |
14494 | MoveAssignment->setImplicit(); |
14495 | |
14496 | if (getLangOpts().CUDA) { |
14497 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXMoveAssignment, |
14498 | MoveAssignment, |
14499 | /* ConstRHS */ false, |
14500 | /* Diagnose */ false); |
14501 | } |
14502 | |
14503 | setupImplicitSpecialMemberType(MoveAssignment, RetType, ArgType); |
14504 | |
14505 | // Add the parameter to the operator. |
14506 | ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, |
14507 | ClassLoc, ClassLoc, |
14508 | /*Id=*/nullptr, ArgType, |
14509 | /*TInfo=*/nullptr, SC_None, |
14510 | nullptr); |
14511 | MoveAssignment->setParams(FromParam); |
14512 | |
14513 | MoveAssignment->setTrivial( |
14514 | ClassDecl->needsOverloadResolutionForMoveAssignment() |
14515 | ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment) |
14516 | : ClassDecl->hasTrivialMoveAssignment()); |
14517 | |
14518 | // Note that we have added this copy-assignment operator. |
14519 | ++getASTContext().NumImplicitMoveAssignmentOperatorsDeclared; |
14520 | |
14521 | Scope *S = getScopeForContext(ClassDecl); |
14522 | CheckImplicitSpecialMemberDeclaration(S, MoveAssignment); |
14523 | |
14524 | if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { |
14525 | ClassDecl->setImplicitMoveAssignmentIsDeleted(); |
14526 | SetDeclDeleted(MoveAssignment, ClassLoc); |
14527 | } |
14528 | |
14529 | if (S) |
14530 | PushOnScopeChains(MoveAssignment, S, false); |
14531 | ClassDecl->addDecl(MoveAssignment); |
14532 | |
14533 | return MoveAssignment; |
14534 | } |
14535 | |
14536 | /// Check if we're implicitly defining a move assignment operator for a class |
14537 | /// with virtual bases. Such a move assignment might move-assign the virtual |
14538 | /// base multiple times. |
14539 | static void checkMoveAssignmentForRepeatedMove(Sema &S, CXXRecordDecl *Class, |
14540 | SourceLocation CurrentLocation) { |
14541 | assert(!Class->isDependentContext() && "should not define dependent move")((void)0); |
14542 | |
14543 | // Only a virtual base could get implicitly move-assigned multiple times. |
14544 | // Only a non-trivial move assignment can observe this. We only want to |
14545 | // diagnose if we implicitly define an assignment operator that assigns |
14546 | // two base classes, both of which move-assign the same virtual base. |
14547 | if (Class->getNumVBases() == 0 || Class->hasTrivialMoveAssignment() || |
14548 | Class->getNumBases() < 2) |
14549 | return; |
14550 | |
14551 | llvm::SmallVector<CXXBaseSpecifier *, 16> Worklist; |
14552 | typedef llvm::DenseMap<CXXRecordDecl*, CXXBaseSpecifier*> VBaseMap; |
14553 | VBaseMap VBases; |
14554 | |
14555 | for (auto &BI : Class->bases()) { |
14556 | Worklist.push_back(&BI); |
14557 | while (!Worklist.empty()) { |
14558 | CXXBaseSpecifier *BaseSpec = Worklist.pop_back_val(); |
14559 | CXXRecordDecl *Base = BaseSpec->getType()->getAsCXXRecordDecl(); |
14560 | |
14561 | // If the base has no non-trivial move assignment operators, |
14562 | // we don't care about moves from it. |
14563 | if (!Base->hasNonTrivialMoveAssignment()) |
14564 | continue; |
14565 | |
14566 | // If there's nothing virtual here, skip it. |
14567 | if (!BaseSpec->isVirtual() && !Base->getNumVBases()) |
14568 | continue; |
14569 | |
14570 | // If we're not actually going to call a move assignment for this base, |
14571 | // or the selected move assignment is trivial, skip it. |
14572 | Sema::SpecialMemberOverloadResult SMOR = |
14573 | S.LookupSpecialMember(Base, Sema::CXXMoveAssignment, |
14574 | /*ConstArg*/false, /*VolatileArg*/false, |
14575 | /*RValueThis*/true, /*ConstThis*/false, |
14576 | /*VolatileThis*/false); |
14577 | if (!SMOR.getMethod() || SMOR.getMethod()->isTrivial() || |
14578 | !SMOR.getMethod()->isMoveAssignmentOperator()) |
14579 | continue; |
14580 | |
14581 | if (BaseSpec->isVirtual()) { |
14582 | // We're going to move-assign this virtual base, and its move |
14583 | // assignment operator is not trivial. If this can happen for |
14584 | // multiple distinct direct bases of Class, diagnose it. (If it |
14585 | // only happens in one base, we'll diagnose it when synthesizing |
14586 | // that base class's move assignment operator.) |
14587 | CXXBaseSpecifier *&Existing = |
14588 | VBases.insert(std::make_pair(Base->getCanonicalDecl(), &BI)) |
14589 | .first->second; |
14590 | if (Existing && Existing != &BI) { |
14591 | S.Diag(CurrentLocation, diag::warn_vbase_moved_multiple_times) |
14592 | << Class << Base; |
14593 | S.Diag(Existing->getBeginLoc(), diag::note_vbase_moved_here) |
14594 | << (Base->getCanonicalDecl() == |
14595 | Existing->getType()->getAsCXXRecordDecl()->getCanonicalDecl()) |
14596 | << Base << Existing->getType() << Existing->getSourceRange(); |
14597 | S.Diag(BI.getBeginLoc(), diag::note_vbase_moved_here) |
14598 | << (Base->getCanonicalDecl() == |
14599 | BI.getType()->getAsCXXRecordDecl()->getCanonicalDecl()) |
14600 | << Base << BI.getType() << BaseSpec->getSourceRange(); |
14601 | |
14602 | // Only diagnose each vbase once. |
14603 | Existing = nullptr; |
14604 | } |
14605 | } else { |
14606 | // Only walk over bases that have defaulted move assignment operators. |
14607 | // We assume that any user-provided move assignment operator handles |
14608 | // the multiple-moves-of-vbase case itself somehow. |
14609 | if (!SMOR.getMethod()->isDefaulted()) |
14610 | continue; |
14611 | |
14612 | // We're going to move the base classes of Base. Add them to the list. |
14613 | for (auto &BI : Base->bases()) |
14614 | Worklist.push_back(&BI); |
14615 | } |
14616 | } |
14617 | } |
14618 | } |
14619 | |
14620 | void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, |
14621 | CXXMethodDecl *MoveAssignOperator) { |
14622 | assert((MoveAssignOperator->isDefaulted() &&((void)0) |
14623 | MoveAssignOperator->isOverloadedOperator() &&((void)0) |
14624 | MoveAssignOperator->getOverloadedOperator() == OO_Equal &&((void)0) |
14625 | !MoveAssignOperator->doesThisDeclarationHaveABody() &&((void)0) |
14626 | !MoveAssignOperator->isDeleted()) &&((void)0) |
14627 | "DefineImplicitMoveAssignment called for wrong function")((void)0); |
14628 | if (MoveAssignOperator->willHaveBody() || MoveAssignOperator->isInvalidDecl()) |
14629 | return; |
14630 | |
14631 | CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); |
14632 | if (ClassDecl->isInvalidDecl()) { |
14633 | MoveAssignOperator->setInvalidDecl(); |
14634 | return; |
14635 | } |
14636 | |
14637 | // C++0x [class.copy]p28: |
14638 | // The implicitly-defined or move assignment operator for a non-union class |
14639 | // X performs memberwise move assignment of its subobjects. The direct base |
14640 | // classes of X are assigned first, in the order of their declaration in the |
14641 | // base-specifier-list, and then the immediate non-static data members of X |
14642 | // are assigned, in the order in which they were declared in the class |
14643 | // definition. |
14644 | |
14645 | // Issue a warning if our implicit move assignment operator will move |
14646 | // from a virtual base more than once. |
14647 | checkMoveAssignmentForRepeatedMove(*this, ClassDecl, CurrentLocation); |
14648 | |
14649 | SynthesizedFunctionScope Scope(*this, MoveAssignOperator); |
14650 | |
14651 | // The exception specification is needed because we are defining the |
14652 | // function. |
14653 | ResolveExceptionSpec(CurrentLocation, |
14654 | MoveAssignOperator->getType()->castAs<FunctionProtoType>()); |
14655 | |
14656 | // Add a context note for diagnostics produced after this point. |
14657 | Scope.addContextNote(CurrentLocation); |
14658 | |
14659 | // The statements that form the synthesized function body. |
14660 | SmallVector<Stmt*, 8> Statements; |
14661 | |
14662 | // The parameter for the "other" object, which we are move from. |
14663 | ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); |
14664 | QualType OtherRefType = |
14665 | Other->getType()->castAs<RValueReferenceType>()->getPointeeType(); |
14666 | |
14667 | // Our location for everything implicitly-generated. |
14668 | SourceLocation Loc = MoveAssignOperator->getEndLoc().isValid() |
14669 | ? MoveAssignOperator->getEndLoc() |
14670 | : MoveAssignOperator->getLocation(); |
14671 | |
14672 | // Builds a reference to the "other" object. |
14673 | RefBuilder OtherRef(Other, OtherRefType); |
14674 | // Cast to rvalue. |
14675 | MoveCastBuilder MoveOther(OtherRef); |
14676 | |
14677 | // Builds the "this" pointer. |
14678 | ThisBuilder This; |
14679 | |
14680 | // Assign base classes. |
14681 | bool Invalid = false; |
14682 | for (auto &Base : ClassDecl->bases()) { |
14683 | // C++11 [class.copy]p28: |
14684 | // It is unspecified whether subobjects representing virtual base classes |
14685 | // are assigned more than once by the implicitly-defined copy assignment |
14686 | // operator. |
14687 | // FIXME: Do not assign to a vbase that will be assigned by some other base |
14688 | // class. For a move-assignment, this can result in the vbase being moved |
14689 | // multiple times. |
14690 | |
14691 | // Form the assignment: |
14692 | // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); |
14693 | QualType BaseType = Base.getType().getUnqualifiedType(); |
14694 | if (!BaseType->isRecordType()) { |
14695 | Invalid = true; |
14696 | continue; |
14697 | } |
14698 | |
14699 | CXXCastPath BasePath; |
14700 | BasePath.push_back(&Base); |
14701 | |
14702 | // Construct the "from" expression, which is an implicit cast to the |
14703 | // appropriately-qualified base type. |
14704 | CastBuilder From(OtherRef, BaseType, VK_XValue, BasePath); |
14705 | |
14706 | // Dereference "this". |
14707 | DerefBuilder DerefThis(This); |
14708 | |
14709 | // Implicitly cast "this" to the appropriately-qualified base type. |
14710 | CastBuilder To(DerefThis, |
14711 | Context.getQualifiedType( |
14712 | BaseType, MoveAssignOperator->getMethodQualifiers()), |
14713 | VK_LValue, BasePath); |
14714 | |
14715 | // Build the move. |
14716 | StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType, |
14717 | To, From, |
14718 | /*CopyingBaseSubobject=*/true, |
14719 | /*Copying=*/false); |
14720 | if (Move.isInvalid()) { |
14721 | MoveAssignOperator->setInvalidDecl(); |
14722 | return; |
14723 | } |
14724 | |
14725 | // Success! Record the move. |
14726 | Statements.push_back(Move.getAs<Expr>()); |
14727 | } |
14728 | |
14729 | // Assign non-static members. |
14730 | for (auto *Field : ClassDecl->fields()) { |
14731 | // FIXME: We should form some kind of AST representation for the implied |
14732 | // memcpy in a union copy operation. |
14733 | if (Field->isUnnamedBitfield() || Field->getParent()->isUnion()) |
14734 | continue; |
14735 | |
14736 | if (Field->isInvalidDecl()) { |
14737 | Invalid = true; |
14738 | continue; |
14739 | } |
14740 | |
14741 | // Check for members of reference type; we can't move those. |
14742 | if (Field->getType()->isReferenceType()) { |
14743 | Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) |
14744 | << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); |
14745 | Diag(Field->getLocation(), diag::note_declared_at); |
14746 | Invalid = true; |
14747 | continue; |
14748 | } |
14749 | |
14750 | // Check for members of const-qualified, non-class type. |
14751 | QualType BaseType = Context.getBaseElementType(Field->getType()); |
14752 | if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { |
14753 | Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) |
14754 | << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); |
14755 | Diag(Field->getLocation(), diag::note_declared_at); |
14756 | Invalid = true; |
14757 | continue; |
14758 | } |
14759 | |
14760 | // Suppress assigning zero-width bitfields. |
14761 | if (Field->isZeroLengthBitField(Context)) |
14762 | continue; |
14763 | |
14764 | QualType FieldType = Field->getType().getNonReferenceType(); |
14765 | if (FieldType->isIncompleteArrayType()) { |
14766 | assert(ClassDecl->hasFlexibleArrayMember() &&((void)0) |
14767 | "Incomplete array type is not valid")((void)0); |
14768 | continue; |
14769 | } |
14770 | |
14771 | // Build references to the field in the object we're copying from and to. |
14772 | LookupResult MemberLookup(*this, Field->getDeclName(), Loc, |
14773 | LookupMemberName); |
14774 | MemberLookup.addDecl(Field); |
14775 | MemberLookup.resolveKind(); |
14776 | MemberBuilder From(MoveOther, OtherRefType, |
14777 | /*IsArrow=*/false, MemberLookup); |
14778 | MemberBuilder To(This, getCurrentThisType(), |
14779 | /*IsArrow=*/true, MemberLookup); |
14780 | |
14781 | assert(!From.build(*this, Loc)->isLValue() && // could be xvalue or prvalue((void)0) |
14782 | "Member reference with rvalue base must be rvalue except for reference "((void)0) |
14783 | "members, which aren't allowed for move assignment.")((void)0); |
14784 | |
14785 | // Build the move of this field. |
14786 | StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType, |
14787 | To, From, |
14788 | /*CopyingBaseSubobject=*/false, |
14789 | /*Copying=*/false); |
14790 | if (Move.isInvalid()) { |
14791 | MoveAssignOperator->setInvalidDecl(); |
14792 | return; |
14793 | } |
14794 | |
14795 | // Success! Record the copy. |
14796 | Statements.push_back(Move.getAs<Stmt>()); |
14797 | } |
14798 | |
14799 | if (!Invalid) { |
14800 | // Add a "return *this;" |
14801 | ExprResult ThisObj = |
14802 | CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc)); |
14803 | |
14804 | StmtResult Return = BuildReturnStmt(Loc, ThisObj.get()); |
14805 | if (Return.isInvalid()) |
14806 | Invalid = true; |
14807 | else |
14808 | Statements.push_back(Return.getAs<Stmt>()); |
14809 | } |
14810 | |
14811 | if (Invalid) { |
14812 | MoveAssignOperator->setInvalidDecl(); |
14813 | return; |
14814 | } |
14815 | |
14816 | StmtResult Body; |
14817 | { |
14818 | CompoundScopeRAII CompoundScope(*this); |
14819 | Body = ActOnCompoundStmt(Loc, Loc, Statements, |
14820 | /*isStmtExpr=*/false); |
14821 | assert(!Body.isInvalid() && "Compound statement creation cannot fail")((void)0); |
14822 | } |
14823 | MoveAssignOperator->setBody(Body.getAs<Stmt>()); |
14824 | MoveAssignOperator->markUsed(Context); |
14825 | |
14826 | if (ASTMutationListener *L = getASTMutationListener()) { |
14827 | L->CompletedImplicitDefinition(MoveAssignOperator); |
14828 | } |
14829 | } |
14830 | |
14831 | CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( |
14832 | CXXRecordDecl *ClassDecl) { |
14833 | // C++ [class.copy]p4: |
14834 | // If the class definition does not explicitly declare a copy |
14835 | // constructor, one is declared implicitly. |
14836 | assert(ClassDecl->needsImplicitCopyConstructor())((void)0); |
14837 | |
14838 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor); |
14839 | if (DSM.isAlreadyBeingDeclared()) |
14840 | return nullptr; |
14841 | |
14842 | QualType ClassType = Context.getTypeDeclType(ClassDecl); |
14843 | QualType ArgType = ClassType; |
14844 | bool Const = ClassDecl->implicitCopyConstructorHasConstParam(); |
14845 | if (Const) |
14846 | ArgType = ArgType.withConst(); |
14847 | |
14848 | LangAS AS = getDefaultCXXMethodAddrSpace(); |
14849 | if (AS != LangAS::Default) |
14850 | ArgType = Context.getAddrSpaceQualType(ArgType, AS); |
14851 | |
14852 | ArgType = Context.getLValueReferenceType(ArgType); |
14853 | |
14854 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, |
14855 | CXXCopyConstructor, |
14856 | Const); |
14857 | |
14858 | DeclarationName Name |
14859 | = Context.DeclarationNames.getCXXConstructorName( |
14860 | Context.getCanonicalType(ClassType)); |
14861 | SourceLocation ClassLoc = ClassDecl->getLocation(); |
14862 | DeclarationNameInfo NameInfo(Name, ClassLoc); |
14863 | |
14864 | // An implicitly-declared copy constructor is an inline public |
14865 | // member of its class. |
14866 | CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( |
14867 | Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/nullptr, |
14868 | ExplicitSpecifier(), |
14869 | /*isInline=*/true, |
14870 | /*isImplicitlyDeclared=*/true, |
14871 | Constexpr ? ConstexprSpecKind::Constexpr |
14872 | : ConstexprSpecKind::Unspecified); |
14873 | CopyConstructor->setAccess(AS_public); |
14874 | CopyConstructor->setDefaulted(); |
14875 | |
14876 | if (getLangOpts().CUDA) { |
14877 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXCopyConstructor, |
14878 | CopyConstructor, |
14879 | /* ConstRHS */ Const, |
14880 | /* Diagnose */ false); |
14881 | } |
14882 | |
14883 | setupImplicitSpecialMemberType(CopyConstructor, Context.VoidTy, ArgType); |
14884 | |
14885 | // During template instantiation of special member functions we need a |
14886 | // reliable TypeSourceInfo for the parameter types in order to allow functions |
14887 | // to be substituted. |
14888 | TypeSourceInfo *TSI = nullptr; |
14889 | if (inTemplateInstantiation() && ClassDecl->isLambda()) |
14890 | TSI = Context.getTrivialTypeSourceInfo(ArgType); |
14891 | |
14892 | // Add the parameter to the constructor. |
14893 | ParmVarDecl *FromParam = |
14894 | ParmVarDecl::Create(Context, CopyConstructor, ClassLoc, ClassLoc, |
14895 | /*IdentifierInfo=*/nullptr, ArgType, |
14896 | /*TInfo=*/TSI, SC_None, nullptr); |
14897 | CopyConstructor->setParams(FromParam); |
14898 | |
14899 | CopyConstructor->setTrivial( |
14900 | ClassDecl->needsOverloadResolutionForCopyConstructor() |
14901 | ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor) |
14902 | : ClassDecl->hasTrivialCopyConstructor()); |
14903 | |
14904 | CopyConstructor->setTrivialForCall( |
14905 | ClassDecl->hasAttr<TrivialABIAttr>() || |
14906 | (ClassDecl->needsOverloadResolutionForCopyConstructor() |
14907 | ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor, |
14908 | TAH_ConsiderTrivialABI) |
14909 | : ClassDecl->hasTrivialCopyConstructorForCall())); |
14910 | |
14911 | // Note that we have declared this constructor. |
14912 | ++getASTContext().NumImplicitCopyConstructorsDeclared; |
14913 | |
14914 | Scope *S = getScopeForContext(ClassDecl); |
14915 | CheckImplicitSpecialMemberDeclaration(S, CopyConstructor); |
14916 | |
14917 | if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) { |
14918 | ClassDecl->setImplicitCopyConstructorIsDeleted(); |
14919 | SetDeclDeleted(CopyConstructor, ClassLoc); |
14920 | } |
14921 | |
14922 | if (S) |
14923 | PushOnScopeChains(CopyConstructor, S, false); |
14924 | ClassDecl->addDecl(CopyConstructor); |
14925 | |
14926 | return CopyConstructor; |
14927 | } |
14928 | |
14929 | void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, |
14930 | CXXConstructorDecl *CopyConstructor) { |
14931 | assert((CopyConstructor->isDefaulted() &&((void)0) |
14932 | CopyConstructor->isCopyConstructor() &&((void)0) |
14933 | !CopyConstructor->doesThisDeclarationHaveABody() &&((void)0) |
14934 | !CopyConstructor->isDeleted()) &&((void)0) |
14935 | "DefineImplicitCopyConstructor - call it for implicit copy ctor")((void)0); |
14936 | if (CopyConstructor->willHaveBody() || CopyConstructor->isInvalidDecl()) |
14937 | return; |
14938 | |
14939 | CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); |
14940 | assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor")((void)0); |
14941 | |
14942 | SynthesizedFunctionScope Scope(*this, CopyConstructor); |
14943 | |
14944 | // The exception specification is needed because we are defining the |
14945 | // function. |
14946 | ResolveExceptionSpec(CurrentLocation, |
14947 | CopyConstructor->getType()->castAs<FunctionProtoType>()); |
14948 | MarkVTableUsed(CurrentLocation, ClassDecl); |
14949 | |
14950 | // Add a context note for diagnostics produced after this point. |
14951 | Scope.addContextNote(CurrentLocation); |
14952 | |
14953 | // C++11 [class.copy]p7: |
14954 | // The [definition of an implicitly declared copy constructor] is |
14955 | // deprecated if the class has a user-declared copy assignment operator |
14956 | // or a user-declared destructor. |
14957 | if (getLangOpts().CPlusPlus11 && CopyConstructor->isImplicit()) |
14958 | diagnoseDeprecatedCopyOperation(*this, CopyConstructor); |
14959 | |
14960 | if (SetCtorInitializers(CopyConstructor, /*AnyErrors=*/false)) { |
14961 | CopyConstructor->setInvalidDecl(); |
14962 | } else { |
14963 | SourceLocation Loc = CopyConstructor->getEndLoc().isValid() |
14964 | ? CopyConstructor->getEndLoc() |
14965 | : CopyConstructor->getLocation(); |
14966 | Sema::CompoundScopeRAII CompoundScope(*this); |
14967 | CopyConstructor->setBody( |
14968 | ActOnCompoundStmt(Loc, Loc, None, /*isStmtExpr=*/false).getAs<Stmt>()); |
14969 | CopyConstructor->markUsed(Context); |
14970 | } |
14971 | |
14972 | if (ASTMutationListener *L = getASTMutationListener()) { |
14973 | L->CompletedImplicitDefinition(CopyConstructor); |
14974 | } |
14975 | } |
14976 | |
14977 | CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( |
14978 | CXXRecordDecl *ClassDecl) { |
14979 | assert(ClassDecl->needsImplicitMoveConstructor())((void)0); |
14980 | |
14981 | DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor); |
14982 | if (DSM.isAlreadyBeingDeclared()) |
14983 | return nullptr; |
14984 | |
14985 | QualType ClassType = Context.getTypeDeclType(ClassDecl); |
14986 | |
14987 | QualType ArgType = ClassType; |
14988 | LangAS AS = getDefaultCXXMethodAddrSpace(); |
14989 | if (AS != LangAS::Default) |
14990 | ArgType = Context.getAddrSpaceQualType(ClassType, AS); |
14991 | ArgType = Context.getRValueReferenceType(ArgType); |
14992 | |
14993 | bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, |
14994 | CXXMoveConstructor, |
14995 | false); |
14996 | |
14997 | DeclarationName Name |
14998 | = Context.DeclarationNames.getCXXConstructorName( |
14999 | Context.getCanonicalType(ClassType)); |
15000 | SourceLocation ClassLoc = ClassDecl->getLocation(); |
15001 | DeclarationNameInfo NameInfo(Name, ClassLoc); |
15002 | |
15003 | // C++11 [class.copy]p11: |
15004 | // An implicitly-declared copy/move constructor is an inline public |
15005 | // member of its class. |
15006 | CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( |
15007 | Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/nullptr, |
15008 | ExplicitSpecifier(), |
15009 | /*isInline=*/true, |
15010 | /*isImplicitlyDeclared=*/true, |
15011 | Constexpr ? ConstexprSpecKind::Constexpr |
15012 | : ConstexprSpecKind::Unspecified); |
15013 | MoveConstructor->setAccess(AS_public); |
15014 | MoveConstructor->setDefaulted(); |
15015 | |
15016 | if (getLangOpts().CUDA) { |
15017 | inferCUDATargetForImplicitSpecialMember(ClassDecl, CXXMoveConstructor, |
15018 | MoveConstructor, |
15019 | /* ConstRHS */ false, |
15020 | /* Diagnose */ false); |
15021 | } |
15022 | |
15023 | setupImplicitSpecialMemberType(MoveConstructor, Context.VoidTy, ArgType); |
15024 | |
15025 | // Add the parameter to the constructor. |
15026 | ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, |
15027 | ClassLoc, ClassLoc, |
15028 | /*IdentifierInfo=*/nullptr, |
15029 | ArgType, /*TInfo=*/nullptr, |
15030 | SC_None, nullptr); |
15031 | MoveConstructor->setParams(FromParam); |
15032 | |
15033 | MoveConstructor->setTrivial( |
15034 | ClassDecl->needsOverloadResolutionForMoveConstructor() |
15035 | ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor) |
15036 | : ClassDecl->hasTrivialMoveConstructor()); |
15037 | |
15038 | MoveConstructor->setTrivialForCall( |
15039 | ClassDecl->hasAttr<TrivialABIAttr>() || |
15040 | (ClassDecl->needsOverloadResolutionForMoveConstructor() |
15041 | ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor, |
15042 | TAH_ConsiderTrivialABI) |
15043 | : ClassDecl->hasTrivialMoveConstructorForCall())); |
15044 | |
15045 | // Note that we have declared this constructor. |
15046 | ++getASTContext().NumImplicitMoveConstructorsDeclared; |
15047 | |
15048 | Scope *S = getScopeForContext(ClassDecl); |
15049 | CheckImplicitSpecialMemberDeclaration(S, MoveConstructor); |
15050 | |
15051 | if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { |
15052 | ClassDecl->setImplicitMoveConstructorIsDeleted(); |
15053 | SetDeclDeleted(MoveConstructor, ClassLoc); |
15054 | } |
15055 | |
15056 | if (S) |
15057 | PushOnScopeChains(MoveConstructor, S, false); |
15058 | ClassDecl->addDecl(MoveConstructor); |
15059 | |
15060 | return MoveConstructor; |
15061 | } |
15062 | |
15063 | void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, |
15064 | CXXConstructorDecl *MoveConstructor) { |
15065 | assert((MoveConstructor->isDefaulted() &&((void)0) |
15066 | MoveConstructor->isMoveConstructor() &&((void)0) |
15067 | !MoveConstructor->doesThisDeclarationHaveABody() &&((void)0) |
15068 | !MoveConstructor->isDeleted()) &&((void)0) |
15069 | "DefineImplicitMoveConstructor - call it for implicit move ctor")((void)0); |
15070 | if (MoveConstructor->willHaveBody() || MoveConstructor->isInvalidDecl()) |
15071 | return; |
15072 | |
15073 | CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); |
15074 | assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor")((void)0); |
15075 | |
15076 | SynthesizedFunctionScope Scope(*this, MoveConstructor); |
15077 | |
15078 | // The exception specification is needed because we are defining the |
15079 | // function. |
15080 | ResolveExceptionSpec(CurrentLocation, |
15081 | MoveConstructor->getType()->castAs<FunctionProtoType>()); |
15082 | MarkVTableUsed(CurrentLocation, ClassDecl); |
15083 | |
15084 | // Add a context note for diagnostics produced after this point. |
15085 | Scope.addContextNote(CurrentLocation); |
15086 | |
15087 | if (SetCtorInitializers(MoveConstructor, /*AnyErrors=*/false)) { |
15088 | MoveConstructor->setInvalidDecl(); |
15089 | } else { |
15090 | SourceLocation Loc = MoveConstructor->getEndLoc().isValid() |
15091 | ? MoveConstructor->getEndLoc() |
15092 | : MoveConstructor->getLocation(); |
15093 | Sema::CompoundScopeRAII CompoundScope(*this); |
15094 | MoveConstructor->setBody(ActOnCompoundStmt( |
15095 | Loc, Loc, None, /*isStmtExpr=*/ false).getAs<Stmt>()); |
15096 | MoveConstructor->markUsed(Context); |
15097 | } |
15098 | |
15099 | if (ASTMutationListener *L = getASTMutationListener()) { |
15100 | L->CompletedImplicitDefinition(MoveConstructor); |
15101 | } |
15102 | } |
15103 | |
15104 | bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { |
15105 | return FD->isDeleted() && FD->isDefaulted() && isa<CXXMethodDecl>(FD); |
15106 | } |
15107 | |
15108 | void Sema::DefineImplicitLambdaToFunctionPointerConversion( |
15109 | SourceLocation CurrentLocation, |
15110 | CXXConversionDecl *Conv) { |
15111 | SynthesizedFunctionScope Scope(*this, Conv); |
15112 | assert(!Conv->getReturnType()->isUndeducedType())((void)0); |
15113 | |
15114 | QualType ConvRT = Conv->getType()->castAs<FunctionType>()->getReturnType(); |
15115 | CallingConv CC = |
15116 | ConvRT->getPointeeType()->castAs<FunctionType>()->getCallConv(); |
15117 | |
15118 | CXXRecordDecl *Lambda = Conv->getParent(); |
15119 | FunctionDecl *CallOp = Lambda->getLambdaCallOperator(); |
15120 | FunctionDecl *Invoker = Lambda->getLambdaStaticInvoker(CC); |
15121 | |
15122 | if (auto *TemplateArgs = Conv->getTemplateSpecializationArgs()) { |
15123 | CallOp = InstantiateFunctionDeclaration( |
15124 | CallOp->getDescribedFunctionTemplate(), TemplateArgs, CurrentLocation); |
15125 | if (!CallOp) |
15126 | return; |
15127 | |
15128 | Invoker = InstantiateFunctionDeclaration( |
15129 | Invoker->getDescribedFunctionTemplate(), TemplateArgs, CurrentLocation); |
15130 | if (!Invoker) |
15131 | return; |
15132 | } |
15133 | |
15134 | if (CallOp->isInvalidDecl()) |
15135 | return; |
15136 | |
15137 | // Mark the call operator referenced (and add to pending instantiations |
15138 | // if necessary). |
15139 | // For both the conversion and static-invoker template specializations |
15140 | // we construct their body's in this function, so no need to add them |
15141 | // to the PendingInstantiations. |
15142 | MarkFunctionReferenced(CurrentLocation, CallOp); |
15143 | |
15144 | // Fill in the __invoke function with a dummy implementation. IR generation |
15145 | // will fill in the actual details. Update its type in case it contained |
15146 | // an 'auto'. |
15147 | Invoker->markUsed(Context); |
15148 | Invoker->setReferenced(); |
15149 | Invoker->setType(Conv->getReturnType()->getPointeeType()); |
15150 | Invoker->setBody(new (Context) CompoundStmt(Conv->getLocation())); |
15151 | |
15152 | // Construct the body of the conversion function { return __invoke; }. |
15153 | Expr *FunctionRef = BuildDeclRefExpr(Invoker, Invoker->getType(), |
15154 | VK_LValue, Conv->getLocation()); |
15155 | assert(FunctionRef && "Can't refer to __invoke function?")((void)0); |
15156 | Stmt *Return = BuildReturnStmt(Conv->getLocation(), FunctionRef).get(); |
15157 | Conv->setBody(CompoundStmt::Create(Context, Return, Conv->getLocation(), |
15158 | Conv->getLocation())); |
15159 | Conv->markUsed(Context); |
15160 | Conv->setReferenced(); |
15161 | |
15162 | if (ASTMutationListener *L = getASTMutationListener()) { |
15163 | L->CompletedImplicitDefinition(Conv); |
15164 | L->CompletedImplicitDefinition(Invoker); |
15165 | } |
15166 | } |
15167 | |
15168 | |
15169 | |
15170 | void Sema::DefineImplicitLambdaToBlockPointerConversion( |
15171 | SourceLocation CurrentLocation, |
15172 | CXXConversionDecl *Conv) |
15173 | { |
15174 | assert(!Conv->getParent()->isGenericLambda())((void)0); |
15175 | |
15176 | SynthesizedFunctionScope Scope(*this, Conv); |
15177 | |
15178 | // Copy-initialize the lambda object as needed to capture it. |
15179 | Expr *This = ActOnCXXThis(CurrentLocation).get(); |
15180 | Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).get(); |
15181 | |
15182 | ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, |
15183 | Conv->getLocation(), |
15184 | Conv, DerefThis); |
15185 | |
15186 | // If we're not under ARC, make sure we still get the _Block_copy/autorelease |
15187 | // behavior. Note that only the general conversion function does this |
15188 | // (since it's unusable otherwise); in the case where we inline the |
15189 | // block literal, it has block literal lifetime semantics. |
15190 | if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) |
15191 | BuildBlock = ImplicitCastExpr::Create( |
15192 | Context, BuildBlock.get()->getType(), CK_CopyAndAutoreleaseBlockObject, |
15193 | BuildBlock.get(), nullptr, VK_PRValue, FPOptionsOverride()); |
15194 | |
15195 | if (BuildBlock.isInvalid()) { |
15196 | Diag(CurrentLocation, diag::note_lambda_to_block_conv); |
15197 | Conv->setInvalidDecl(); |
15198 | return; |
15199 | } |
15200 | |
15201 | // Create the return statement that returns the block from the conversion |
15202 | // function. |
15203 | StmtResult Return = BuildReturnStmt(Conv->getLocation(), BuildBlock.get()); |
15204 | if (Return.isInvalid()) { |
15205 | Diag(CurrentLocation, diag::note_lambda_to_block_conv); |
15206 | Conv->setInvalidDecl(); |
15207 | return; |
15208 | } |
15209 | |
15210 | // Set the body of the conversion function. |
15211 | Stmt *ReturnS = Return.get(); |
15212 | Conv->setBody(CompoundStmt::Create(Context, ReturnS, Conv->getLocation(), |
15213 | Conv->getLocation())); |
15214 | Conv->markUsed(Context); |
15215 | |
15216 | // We're done; notify the mutation listener, if any. |
15217 | if (ASTMutationListener *L = getASTMutationListener()) { |
15218 | L->CompletedImplicitDefinition(Conv); |
15219 | } |
15220 | } |
15221 | |
15222 | /// Determine whether the given list arguments contains exactly one |
15223 | /// "real" (non-default) argument. |
15224 | static bool hasOneRealArgument(MultiExprArg Args) { |
15225 | switch (Args.size()) { |
15226 | case 0: |
15227 | return false; |
15228 | |
15229 | default: |
15230 | if (!Args[1]->isDefaultArgument()) |
15231 | return false; |
15232 | |
15233 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; |
15234 | case 1: |
15235 | return !Args[0]->isDefaultArgument(); |
15236 | } |
15237 | |
15238 | return false; |
15239 | } |
15240 | |
15241 | ExprResult |
15242 | Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, |
15243 | NamedDecl *FoundDecl, |
15244 | CXXConstructorDecl *Constructor, |
15245 | MultiExprArg ExprArgs, |
15246 | bool HadMultipleCandidates, |
15247 | bool IsListInitialization, |
15248 | bool IsStdInitListInitialization, |
15249 | bool RequiresZeroInit, |
15250 | unsigned ConstructKind, |
15251 | SourceRange ParenRange) { |
15252 | bool Elidable = false; |
15253 | |
15254 | // C++0x [class.copy]p34: |
15255 | // When certain criteria are met, an implementation is allowed to |
15256 | // omit the copy/move construction of a class object, even if the |
15257 | // copy/move constructor and/or destructor for the object have |
15258 | // side effects. [...] |
15259 | // - when a temporary class object that has not been bound to a |
15260 | // reference (12.2) would be copied/moved to a class object |
15261 | // with the same cv-unqualified type, the copy/move operation |
15262 | // can be omitted by constructing the temporary object |
15263 | // directly into the target of the omitted copy/move |
15264 | if (ConstructKind == CXXConstructExpr::CK_Complete && Constructor && |
15265 | // FIXME: Converting constructors should also be accepted. |
15266 | // But to fix this, the logic that digs down into a CXXConstructExpr |
15267 | // to find the source object needs to handle it. |
15268 | // Right now it assumes the source object is passed directly as the |
15269 | // first argument. |
15270 | Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { |
15271 | Expr *SubExpr = ExprArgs[0]; |
15272 | // FIXME: Per above, this is also incorrect if we want to accept |
15273 | // converting constructors, as isTemporaryObject will |
15274 | // reject temporaries with different type from the |
15275 | // CXXRecord itself. |
15276 | Elidable = SubExpr->isTemporaryObject( |
15277 | Context, cast<CXXRecordDecl>(FoundDecl->getDeclContext())); |
15278 | } |
15279 | |
15280 | return BuildCXXConstructExpr(ConstructLoc, DeclInitType, |
15281 | FoundDecl, Constructor, |
15282 | Elidable, ExprArgs, HadMultipleCandidates, |
15283 | IsListInitialization, |
15284 | IsStdInitListInitialization, RequiresZeroInit, |
15285 | ConstructKind, ParenRange); |
15286 | } |
15287 | |
15288 | ExprResult |
15289 | Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, |
15290 | NamedDecl *FoundDecl, |
15291 | CXXConstructorDecl *Constructor, |
15292 | bool Elidable, |
15293 | MultiExprArg ExprArgs, |
15294 | bool HadMultipleCandidates, |
15295 | bool IsListInitialization, |
15296 | bool IsStdInitListInitialization, |
15297 | bool RequiresZeroInit, |
15298 | unsigned ConstructKind, |
15299 | SourceRange ParenRange) { |
15300 | if (auto *Shadow = dyn_cast<ConstructorUsingShadowDecl>(FoundDecl)) { |
15301 | Constructor = findInheritingConstructor(ConstructLoc, Constructor, Shadow); |
15302 | if (DiagnoseUseOfDecl(Constructor, ConstructLoc)) |
15303 | return ExprError(); |
15304 | } |
15305 | |
15306 | return BuildCXXConstructExpr( |
15307 | ConstructLoc, DeclInitType, Constructor, Elidable, ExprArgs, |
15308 | HadMultipleCandidates, IsListInitialization, IsStdInitListInitialization, |
15309 | RequiresZeroInit, ConstructKind, ParenRange); |
15310 | } |
15311 | |
15312 | /// BuildCXXConstructExpr - Creates a complete call to a constructor, |
15313 | /// including handling of its default argument expressions. |
15314 | ExprResult |
15315 | Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, |
15316 | CXXConstructorDecl *Constructor, |
15317 | bool Elidable, |
15318 | MultiExprArg ExprArgs, |
15319 | bool HadMultipleCandidates, |
15320 | bool IsListInitialization, |
15321 | bool IsStdInitListInitialization, |
15322 | bool RequiresZeroInit, |
15323 | unsigned ConstructKind, |
15324 | SourceRange ParenRange) { |
15325 | assert(declaresSameEntity(((void)0) |
15326 | Constructor->getParent(),((void)0) |
15327 | DeclInitType->getBaseElementTypeUnsafe()->getAsCXXRecordDecl()) &&((void)0) |
15328 | "given constructor for wrong type")((void)0); |
15329 | MarkFunctionReferenced(ConstructLoc, Constructor); |
15330 | if (getLangOpts().CUDA && !CheckCUDACall(ConstructLoc, Constructor)) |
15331 | return ExprError(); |
15332 | if (getLangOpts().SYCLIsDevice && |
15333 | !checkSYCLDeviceFunction(ConstructLoc, Constructor)) |
15334 | return ExprError(); |
15335 | |
15336 | return CheckForImmediateInvocation( |
15337 | CXXConstructExpr::Create( |
15338 | Context, DeclInitType, ConstructLoc, Constructor, Elidable, ExprArgs, |
15339 | HadMultipleCandidates, IsListInitialization, |
15340 | IsStdInitListInitialization, RequiresZeroInit, |
15341 | static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), |
15342 | ParenRange), |
15343 | Constructor); |
15344 | } |
15345 | |
15346 | ExprResult Sema::BuildCXXDefaultInitExpr(SourceLocation Loc, FieldDecl *Field) { |
15347 | assert(Field->hasInClassInitializer())((void)0); |
15348 | |
15349 | // If we already have the in-class initializer nothing needs to be done. |
15350 | if (Field->getInClassInitializer()) |
15351 | return CXXDefaultInitExpr::Create(Context, Loc, Field, CurContext); |
15352 | |
15353 | // If we might have already tried and failed to instantiate, don't try again. |
15354 | if (Field->isInvalidDecl()) |
15355 | return ExprError(); |
15356 | |
15357 | // Maybe we haven't instantiated the in-class initializer. Go check the |
15358 | // pattern FieldDecl to see if it has one. |
15359 | CXXRecordDecl *ParentRD = cast<CXXRecordDecl>(Field->getParent()); |
15360 | |
15361 | if (isTemplateInstantiation(ParentRD->getTemplateSpecializationKind())) { |
15362 | CXXRecordDecl *ClassPattern = ParentRD->getTemplateInstantiationPattern(); |
15363 | DeclContext::lookup_result Lookup = |
15364 | ClassPattern->lookup(Field->getDeclName()); |
15365 | |
15366 | FieldDecl *Pattern = nullptr; |
15367 | for (auto L : Lookup) { |
15368 | if (isa<FieldDecl>(L)) { |
15369 | Pattern = cast<FieldDecl>(L); |
15370 | break; |
15371 | } |
15372 | } |
15373 | assert(Pattern && "We must have set the Pattern!")((void)0); |
15374 | |
15375 | if (!Pattern->hasInClassInitializer() || |
15376 | InstantiateInClassInitializer(Loc, Field, Pattern, |
15377 | getTemplateInstantiationArgs(Field))) { |
15378 | // Don't diagnose this again. |
15379 | Field->setInvalidDecl(); |
15380 | return ExprError(); |
15381 | } |
15382 | return CXXDefaultInitExpr::Create(Context, Loc, Field, CurContext); |
15383 | } |
15384 | |
15385 | // DR1351: |
15386 | // If the brace-or-equal-initializer of a non-static data member |
15387 | // invokes a defaulted default constructor of its class or of an |
15388 | // enclosing class in a potentially evaluated subexpression, the |
15389 | // program is ill-formed. |
15390 | // |
15391 | // This resolution is unworkable: the exception specification of the |
15392 | // default constructor can be needed in an unevaluated context, in |
15393 | // particular, in the operand of a noexcept-expression, and we can be |
15394 | // unable to compute an exception specification for an enclosed class. |
15395 | // |
15396 | // Any attempt to resolve the exception specification of a defaulted default |
15397 | // constructor before the initializer is lexically complete will ultimately |
15398 | // come here at which point we can diagnose it. |
15399 | RecordDecl *OutermostClass = ParentRD->getOuterLexicalRecordContext(); |
15400 | Diag(Loc, diag::err_default_member_initializer_not_yet_parsed) |
15401 | << OutermostClass << Field; |
15402 | Diag(Field->getEndLoc(), |
15403 | diag::note_default_member_initializer_not_yet_parsed); |
15404 | // Recover by marking the field invalid, unless we're in a SFINAE context. |
15405 | if (!isSFINAEContext()) |
15406 | Field->setInvalidDecl(); |
15407 | return ExprError(); |
15408 | } |
15409 | |
15410 | void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { |
15411 | if (VD->isInvalidDecl()) return; |
15412 | // If initializing the variable failed, don't also diagnose problems with |
15413 | // the desctructor, they're likely related. |
15414 | if (VD->getInit() && VD->getInit()->containsErrors()) |
15415 | return; |
15416 | |
15417 | CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); |
15418 | if (ClassDecl->isInvalidDecl()) return; |
15419 | if (ClassDecl->hasIrrelevantDestructor()) return; |
15420 | if (ClassDecl->isDependentContext()) return; |
15421 | |
15422 | if (VD->isNoDestroy(getASTContext())) |
15423 | return; |
15424 | |
15425 | CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); |
15426 | |
15427 | // If this is an array, we'll require the destructor during initialization, so |
15428 | // we can skip over this. We still want to emit exit-time destructor warnings |
15429 | // though. |
15430 | if (!VD->getType()->isArrayType()) { |
15431 | MarkFunctionReferenced(VD->getLocation(), Destructor); |
15432 | CheckDestructorAccess(VD->getLocation(), Destructor, |
15433 | PDiag(diag::err_access_dtor_var) |
15434 | << VD->getDeclName() << VD->getType()); |
15435 | DiagnoseUseOfDecl(Destructor, VD->getLocation()); |
15436 | } |
15437 | |
15438 | if (Destructor->isTrivial()) return; |
15439 | |
15440 | // If the destructor is constexpr, check whether the variable has constant |
15441 | // destruction now. |
15442 | if (Destructor->isConstexpr()) { |
15443 | bool HasConstantInit = false; |
15444 | if (VD->getInit() && !VD->getInit()->isValueDependent()) |
15445 | HasConstantInit = VD->evaluateValue(); |
15446 | SmallVector<PartialDiagnosticAt, 8> Notes; |
15447 | if (!VD->evaluateDestruction(Notes) && VD->isConstexpr() && |
15448 | HasConstantInit) { |
15449 | Diag(VD->getLocation(), |
15450 | diag::err_constexpr_var_requires_const_destruction) << VD; |
15451 | for (unsigned I = 0, N = Notes.size(); I != N; ++I) |
15452 | Diag(Notes[I].first, Notes[I].second); |
15453 | } |
15454 | } |
15455 | |
15456 | if (!VD->hasGlobalStorage()) return; |
15457 | |
15458 | // Emit warning for non-trivial dtor in global scope (a real global, |
15459 | // class-static, function-static). |
15460 | Diag(VD->getLocation(), diag::warn_exit_time_destructor); |
15461 | |
15462 | // TODO: this should be re-enabled for static locals by !CXAAtExit |
15463 | if (!VD->isStaticLocal()) |
15464 | Diag(VD->getLocation(), diag::warn_global_destructor); |
15465 | } |
15466 | |
15467 | /// Given a constructor and the set of arguments provided for the |
15468 | /// constructor, convert the arguments and add any required default arguments |
15469 | /// to form a proper call to this constructor. |
15470 | /// |
15471 | /// \returns true if an error occurred, false otherwise. |
15472 | bool Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, |
15473 | QualType DeclInitType, MultiExprArg ArgsPtr, |
15474 | SourceLocation Loc, |
15475 | SmallVectorImpl<Expr *> &ConvertedArgs, |
15476 | bool AllowExplicit, |
15477 | bool IsListInitialization) { |
15478 | // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. |
15479 | unsigned NumArgs = ArgsPtr.size(); |
15480 | Expr **Args = ArgsPtr.data(); |
15481 | |
15482 | const auto *Proto = Constructor->getType()->castAs<FunctionProtoType>(); |
15483 | unsigned NumParams = Proto->getNumParams(); |
15484 | |
15485 | // If too few arguments are available, we'll fill in the rest with defaults. |
15486 | if (NumArgs < NumParams) |
15487 | ConvertedArgs.reserve(NumParams); |
15488 | else |
15489 | ConvertedArgs.reserve(NumArgs); |
15490 | |
15491 | VariadicCallType CallType = |
15492 | Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; |
15493 | SmallVector<Expr *, 8> AllArgs; |
15494 | bool Invalid = GatherArgumentsForCall(Loc, Constructor, |
15495 | Proto, 0, |
15496 | llvm::makeArrayRef(Args, NumArgs), |
15497 | AllArgs, |
15498 | CallType, AllowExplicit, |
15499 | IsListInitialization); |
15500 | ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); |
15501 | |
15502 | DiagnoseSentinelCalls(Constructor, Loc, AllArgs); |
15503 | |
15504 | CheckConstructorCall(Constructor, DeclInitType, |
15505 | llvm::makeArrayRef(AllArgs.data(), AllArgs.size()), |
15506 | Proto, Loc); |
15507 | |
15508 | return Invalid; |
15509 | } |
15510 | |
15511 | static inline bool |
15512 | CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, |
15513 | const FunctionDecl *FnDecl) { |
15514 | const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); |
15515 | if (isa<NamespaceDecl>(DC)) { |
15516 | return SemaRef.Diag(FnDecl->getLocation(), |
15517 | diag::err_operator_new_delete_declared_in_namespace) |
15518 | << FnDecl->getDeclName(); |
15519 | } |
15520 | |
15521 | if (isa<TranslationUnitDecl>(DC) && |
15522 | FnDecl->getStorageClass() == SC_Static) { |
15523 | return SemaRef.Diag(FnDecl->getLocation(), |
15524 | diag::err_operator_new_delete_declared_static) |
15525 | << FnDecl->getDeclName(); |
15526 | } |
15527 | |
15528 | return false; |
15529 | } |
15530 | |
15531 | static CanQualType RemoveAddressSpaceFromPtr(Sema &SemaRef, |
15532 | const PointerType *PtrTy) { |
15533 | auto &Ctx = SemaRef.Context; |
15534 | Qualifiers PtrQuals = PtrTy->getPointeeType().getQualifiers(); |
15535 | PtrQuals.removeAddressSpace(); |
15536 | return Ctx.getPointerType(Ctx.getCanonicalType(Ctx.getQualifiedType( |
15537 | PtrTy->getPointeeType().getUnqualifiedType(), PtrQuals))); |
15538 | } |
15539 | |
15540 | static inline bool |
15541 | CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, |
15542 | CanQualType ExpectedResultType, |
15543 | CanQualType ExpectedFirstParamType, |
15544 | unsigned DependentParamTypeDiag, |
15545 | unsigned InvalidParamTypeDiag) { |
15546 | QualType ResultType = |
15547 | FnDecl->getType()->castAs<FunctionType>()->getReturnType(); |
15548 | |
15549 | if (SemaRef.getLangOpts().OpenCLCPlusPlus) { |
15550 | // The operator is valid on any address space for OpenCL. |
15551 | // Drop address space from actual and expected result types. |
15552 | if (const auto *PtrTy = ResultType->getAs<PointerType>()) |
15553 | ResultType = RemoveAddressSpaceFromPtr(SemaRef, PtrTy); |
15554 | |
15555 | if (auto ExpectedPtrTy = ExpectedResultType->getAs<PointerType>()) |
15556 | ExpectedResultType = RemoveAddressSpaceFromPtr(SemaRef, ExpectedPtrTy); |
15557 | } |
15558 | |
15559 | // Check that the result type is what we expect. |
15560 | if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) { |
15561 | // Reject even if the type is dependent; an operator delete function is |
15562 | // required to have a non-dependent result type. |
15563 | return SemaRef.Diag( |
15564 | FnDecl->getLocation(), |
15565 | ResultType->isDependentType() |
15566 | ? diag::err_operator_new_delete_dependent_result_type |
15567 | : diag::err_operator_new_delete_invalid_result_type) |
15568 | << FnDecl->getDeclName() << ExpectedResultType; |
15569 | } |
15570 | |
15571 | // A function template must have at least 2 parameters. |
15572 | if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) |
15573 | return SemaRef.Diag(FnDecl->getLocation(), |
15574 | diag::err_operator_new_delete_template_too_few_parameters) |
15575 | << FnDecl->getDeclName(); |
15576 | |
15577 | // The function decl must have at least 1 parameter. |
15578 | if (FnDecl->getNumParams() == 0) |
15579 | return SemaRef.Diag(FnDecl->getLocation(), |
15580 | diag::err_operator_new_delete_too_few_parameters) |
15581 | << FnDecl->getDeclName(); |
15582 | |
15583 | QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); |
15584 | if (SemaRef.getLangOpts().OpenCLCPlusPlus) { |
15585 | // The operator is valid on any address space for OpenCL. |
15586 | // Drop address space from actual and expected first parameter types. |
15587 | if (const auto *PtrTy = |
15588 | FnDecl->getParamDecl(0)->getType()->getAs<PointerType>()) |
15589 | FirstParamType = RemoveAddressSpaceFromPtr(SemaRef, PtrTy); |
15590 | |
15591 | if (auto ExpectedPtrTy = ExpectedFirstParamType->getAs<PointerType>()) |
15592 | ExpectedFirstParamType = |
15593 | RemoveAddressSpaceFromPtr(SemaRef, ExpectedPtrTy); |
15594 | } |
15595 | |
15596 | // Check that the first parameter type is what we expect. |
15597 | if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != |
15598 | ExpectedFirstParamType) { |
15599 | // The first parameter type is not allowed to be dependent. As a tentative |
15600 | // DR resolution, we allow a dependent parameter type if it is the right |
15601 | // type anyway, to allow destroying operator delete in class templates. |
15602 | return SemaRef.Diag(FnDecl->getLocation(), FirstParamType->isDependentType() |
15603 | ? DependentParamTypeDiag |
15604 | : InvalidParamTypeDiag) |
15605 | << FnDecl->getDeclName() << ExpectedFirstParamType; |
15606 | } |
15607 | |
15608 | return false; |
15609 | } |
15610 | |
15611 | static bool |
15612 | CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { |
15613 | // C++ [basic.stc.dynamic.allocation]p1: |
15614 | // A program is ill-formed if an allocation function is declared in a |
15615 | // namespace scope other than global scope or declared static in global |
15616 | // scope. |
15617 | if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) |
15618 | return true; |
15619 | |
15620 | CanQualType SizeTy = |
15621 | SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); |
15622 | |
15623 | // C++ [basic.stc.dynamic.allocation]p1: |
15624 | // The return type shall be void*. The first parameter shall have type |
15625 | // std::size_t. |
15626 | if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, |
15627 | SizeTy, |
15628 | diag::err_operator_new_dependent_param_type, |
15629 | diag::err_operator_new_param_type)) |
15630 | return true; |
15631 | |
15632 | // C++ [basic.stc.dynamic.allocation]p1: |
15633 | // The first parameter shall not have an associated default argument. |
15634 | if (FnDecl->getParamDecl(0)->hasDefaultArg()) |
15635 | return SemaRef.Diag(FnDecl->getLocation(), |
15636 | diag::err_operator_new_default_arg) |
15637 | << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); |
15638 | |
15639 | return false; |
15640 | } |
15641 | |
15642 | static bool |
15643 | CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) { |
15644 | // C++ [basic.stc.dynamic.deallocation]p1: |
15645 | // A program is ill-formed if deallocation functions are declared in a |
15646 | // namespace scope other than global scope or declared static in global |
15647 | // scope. |
15648 | if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) |
15649 | return true; |
15650 | |
15651 | auto *MD = dyn_cast<CXXMethodDecl>(FnDecl); |
15652 | |
15653 | // C++ P0722: |
15654 | // Within a class C, the first parameter of a destroying operator delete |
15655 | // shall be of type C *. The first parameter of any other deallocation |
15656 | // function shall be of type void *. |
15657 | CanQualType ExpectedFirstParamType = |
15658 | MD && MD->isDestroyingOperatorDelete() |
15659 | ? SemaRef.Context.getCanonicalType(SemaRef.Context.getPointerType( |
15660 | SemaRef.Context.getRecordType(MD->getParent()))) |
15661 | : SemaRef.Context.VoidPtrTy; |
15662 | |
15663 | // C++ [basic.stc.dynamic.deallocation]p2: |
15664 | // Each deallocation function shall return void |
15665 | if (CheckOperatorNewDeleteTypes( |
15666 | SemaRef, FnDecl, SemaRef.Context.VoidTy, ExpectedFirstParamType, |
15667 | diag::err_operator_delete_dependent_param_type, |
15668 | diag::err_operator_delete_param_type)) |
15669 | return true; |
15670 | |
15671 | // C++ P0722: |
15672 | // A destroying operator delete shall be a usual deallocation function. |
15673 | if (MD && !MD->getParent()->isDependentContext() && |
15674 | MD->isDestroyingOperatorDelete() && |
15675 | !SemaRef.isUsualDeallocationFunction(MD)) { |
15676 | SemaRef.Diag(MD->getLocation(), |
15677 | diag::err_destroying_operator_delete_not_usual); |
15678 | return true; |
15679 | } |
15680 | |
15681 | return false; |
15682 | } |
15683 | |
15684 | /// CheckOverloadedOperatorDeclaration - Check whether the declaration |
15685 | /// of this overloaded operator is well-formed. If so, returns false; |
15686 | /// otherwise, emits appropriate diagnostics and returns true. |
15687 | bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { |
15688 | assert(FnDecl && FnDecl->isOverloadedOperator() &&((void)0) |
15689 | "Expected an overloaded operator declaration")((void)0); |
15690 | |
15691 | OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); |
15692 | |
15693 | // C++ [over.oper]p5: |
15694 | // The allocation and deallocation functions, operator new, |
15695 | // operator new[], operator delete and operator delete[], are |
15696 | // described completely in 3.7.3. The attributes and restrictions |
15697 | // found in the rest of this subclause do not apply to them unless |
15698 | // explicitly stated in 3.7.3. |
15699 | if (Op == OO_Delete || Op == OO_Array_Delete) |
15700 | return CheckOperatorDeleteDeclaration(*this, FnDecl); |
15701 | |
15702 | if (Op == OO_New || Op == OO_Array_New) |
15703 | return CheckOperatorNewDeclaration(*this, FnDecl); |
15704 | |
15705 | // C++ [over.oper]p6: |
15706 | // An operator function shall either be a non-static member |
15707 | // function or be a non-member function and have at least one |
15708 | // parameter whose type is a class, a reference to a class, an |
15709 | // enumeration, or a reference to an enumeration. |
15710 | if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { |
15711 | if (MethodDecl->isStatic()) |
15712 | return Diag(FnDecl->getLocation(), |
15713 | diag::err_operator_overload_static) << FnDecl->getDeclName(); |
15714 | } else { |
15715 | bool ClassOrEnumParam = false; |
15716 | for (auto Param : FnDecl->parameters()) { |
15717 | QualType ParamType = Param->getType().getNonReferenceType(); |
15718 | if (ParamType->isDependentType() || ParamType->isRecordType() || |
15719 | ParamType->isEnumeralType()) { |
15720 | ClassOrEnumParam = true; |
15721 | break; |
15722 | } |
15723 | } |
15724 | |
15725 | if (!ClassOrEnumParam) |
15726 | return Diag(FnDecl->getLocation(), |
15727 | diag::err_operator_overload_needs_class_or_enum) |
15728 | << FnDecl->getDeclName(); |
15729 | } |
15730 | |
15731 | // C++ [over.oper]p8: |
15732 | // An operator function cannot have default arguments (8.3.6), |
15733 | // except where explicitly stated below. |
15734 | // |
15735 | // Only the function-call operator allows default arguments |
15736 | // (C++ [over.call]p1). |
15737 | if (Op != OO_Call) { |
15738 | for (auto Param : FnDecl->parameters()) { |
15739 | if (Param->hasDefaultArg()) |
15740 | return Diag(Param->getLocation(), |
15741 | diag::err_operator_overload_default_arg) |
15742 | << FnDecl->getDeclName() << Param->getDefaultArgRange(); |
15743 | } |
15744 | } |
15745 | |
15746 | static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { |
15747 | { false, false, false } |
15748 | #define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ |
15749 | , { Unary, Binary, MemberOnly } |
15750 | #include "clang/Basic/OperatorKinds.def" |
15751 | }; |
15752 | |
15753 | bool CanBeUnaryOperator = OperatorUses[Op][0]; |
15754 | bool CanBeBinaryOperator = OperatorUses[Op][1]; |
15755 | bool MustBeMemberOperator = OperatorUses[Op][2]; |
15756 | |
15757 | // C++ [over.oper]p8: |
15758 | // [...] Operator functions cannot have more or fewer parameters |
15759 | // than the number required for the corresponding operator, as |
15760 | // described in the rest of this subclause. |
15761 | unsigned NumParams = FnDecl->getNumParams() |
15762 | + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); |
15763 | if (Op != OO_Call && |
15764 | ((NumParams == 1 && !CanBeUnaryOperator) || |
15765 | (NumParams == 2 && !CanBeBinaryOperator) || |
15766 | (NumParams < 1) || (NumParams > 2))) { |
15767 | // We have the wrong number of parameters. |
15768 | unsigned ErrorKind; |
15769 | if (CanBeUnaryOperator && CanBeBinaryOperator) { |
15770 | ErrorKind = 2; // 2 -> unary or binary. |
15771 | } else if (CanBeUnaryOperator) { |
15772 | ErrorKind = 0; // 0 -> unary |
15773 | } else { |
15774 | assert(CanBeBinaryOperator &&((void)0) |
15775 | "All non-call overloaded operators are unary or binary!")((void)0); |
15776 | ErrorKind = 1; // 1 -> binary |
15777 | } |
15778 | |
15779 | return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) |
15780 | << FnDecl->getDeclName() << NumParams << ErrorKind; |
15781 | } |
15782 | |
15783 | // Overloaded operators other than operator() cannot be variadic. |
15784 | if (Op != OO_Call && |
15785 | FnDecl->getType()->castAs<FunctionProtoType>()->isVariadic()) { |
15786 | return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) |
15787 | << FnDecl->getDeclName(); |
15788 | } |
15789 | |
15790 | // Some operators must be non-static member functions. |
15791 | if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { |
15792 | return Diag(FnDecl->getLocation(), |
15793 | diag::err_operator_overload_must_be_member) |
15794 | << FnDecl->getDeclName(); |
15795 | } |
15796 | |
15797 | // C++ [over.inc]p1: |
15798 | // The user-defined function called operator++ implements the |
15799 | // prefix and postfix ++ operator. If this function is a member |
15800 | // function with no parameters, or a non-member function with one |
15801 | // parameter of class or enumeration type, it defines the prefix |
15802 | // increment operator ++ for objects of that type. If the function |
15803 | // is a member function with one parameter (which shall be of type |
15804 | // int) or a non-member function with two parameters (the second |
15805 | // of which shall be of type int), it defines the postfix |
15806 | // increment operator ++ for objects of that type. |
15807 | if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { |
15808 | ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); |
15809 | QualType ParamType = LastParam->getType(); |
15810 | |
15811 | if (!ParamType->isSpecificBuiltinType(BuiltinType::Int) && |
15812 | !ParamType->isDependentType()) |
15813 | return Diag(LastParam->getLocation(), |
15814 | diag::err_operator_overload_post_incdec_must_be_int) |
15815 | << LastParam->getType() << (Op == OO_MinusMinus); |
15816 | } |
15817 | |
15818 | return false; |
15819 | } |
15820 | |
15821 | static bool |
15822 | checkLiteralOperatorTemplateParameterList(Sema &SemaRef, |
15823 | FunctionTemplateDecl *TpDecl) { |
15824 | TemplateParameterList *TemplateParams = TpDecl->getTemplateParameters(); |
15825 | |
15826 | // Must have one or two template parameters. |
15827 | if (TemplateParams->size() == 1) { |
15828 | NonTypeTemplateParmDecl *PmDecl = |
15829 | dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(0)); |
15830 | |
15831 | // The template parameter must be a char parameter pack. |
15832 | if (PmDecl && PmDecl->isTemplateParameterPack() && |
15833 | SemaRef.Context.hasSameType(PmDecl->getType(), SemaRef.Context.CharTy)) |
15834 | return false; |
15835 | |
15836 | // C++20 [over.literal]p5: |
15837 | // A string literal operator template is a literal operator template |
15838 | // whose template-parameter-list comprises a single non-type |
15839 | // template-parameter of class type. |
15840 | // |
15841 | // As a DR resolution, we also allow placeholders for deduced class |
15842 | // template specializations. |
15843 | if (SemaRef.getLangOpts().CPlusPlus20 && |
15844 | !PmDecl->isTemplateParameterPack() && |
15845 | (PmDecl->getType()->isRecordType() || |
15846 | PmDecl->getType()->getAs<DeducedTemplateSpecializationType>())) |
15847 | return false; |
15848 | } else if (TemplateParams->size() == 2) { |
15849 | TemplateTypeParmDecl *PmType = |
15850 | dyn_cast<TemplateTypeParmDecl>(TemplateParams->getParam(0)); |
15851 | NonTypeTemplateParmDecl *PmArgs = |
15852 | dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(1)); |
15853 | |
15854 | // The second template parameter must be a parameter pack with the |
15855 | // first template parameter as its type. |
15856 | if (PmType && PmArgs && !PmType->isTemplateParameterPack() && |
15857 | PmArgs->isTemplateParameterPack()) { |
15858 | const TemplateTypeParmType *TArgs = |
15859 | PmArgs->getType()->getAs<TemplateTypeParmType>(); |
15860 | if (TArgs && TArgs->getDepth() == PmType->getDepth() && |
15861 | TArgs->getIndex() == PmType->getIndex()) { |
15862 | if (!SemaRef.inTemplateInstantiation()) |
15863 | SemaRef.Diag(TpDecl->getLocation(), |
15864 | diag::ext_string_literal_operator_template); |
15865 | return false; |
15866 | } |
15867 | } |
15868 | } |
15869 | |
15870 | SemaRef.Diag(TpDecl->getTemplateParameters()->getSourceRange().getBegin(), |
15871 | diag::err_literal_operator_template) |
15872 | << TpDecl->getTemplateParameters()->getSourceRange(); |
15873 | return true; |
15874 | } |
15875 | |
15876 | /// CheckLiteralOperatorDeclaration - Check whether the declaration |
15877 | /// of this literal operator function is well-formed. If so, returns |
15878 | /// false; otherwise, emits appropriate diagnostics and returns true. |
15879 | bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { |
15880 | if (isa<CXXMethodDecl>(FnDecl)) { |
15881 | Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) |
15882 | << FnDecl->getDeclName(); |
15883 | return true; |
15884 | } |
15885 | |
15886 | if (FnDecl->isExternC()) { |
15887 | Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); |
15888 | if (const LinkageSpecDecl *LSD = |
15889 | FnDecl->getDeclContext()->getExternCContext()) |
15890 | Diag(LSD->getExternLoc(), diag::note_extern_c_begins_here); |
15891 | return true; |
15892 | } |
15893 | |
15894 | // This might be the definition of a literal operator template. |
15895 | FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); |
15896 | |
15897 | // This might be a specialization of a literal operator template. |
15898 | if (!TpDecl) |
15899 | TpDecl = FnDecl->getPrimaryTemplate(); |
15900 | |
15901 | // template <char...> type operator "" name() and |
15902 | // template <class T, T...> type operator "" name() are the only valid |
15903 | // template signatures, and the only valid signatures with no parameters. |
15904 | // |
15905 | // C++20 also allows template <SomeClass T> type operator "" name(). |
15906 | if (TpDecl) { |
15907 | if (FnDecl->param_size() != 0) { |
15908 | Diag(FnDecl->getLocation(), |
15909 | diag::err_literal_operator_template_with_params); |
15910 | return true; |
15911 | } |
15912 | |
15913 | if (checkLiteralOperatorTemplateParameterList(*this, TpDecl)) |
15914 | return true; |
15915 | |
15916 | } else if (FnDecl->param_size() == 1) { |
15917 | const ParmVarDecl *Param = FnDecl->getParamDecl(0); |
15918 | |
15919 | QualType ParamType = Param->getType().getUnqualifiedType(); |
15920 | |
15921 | // Only unsigned long long int, long double, any character type, and const |
15922 | // char * are allowed as the only parameters. |
15923 | if (ParamType->isSpecificBuiltinType(BuiltinType::ULongLong) || |
15924 | ParamType->isSpecificBuiltinType(BuiltinType::LongDouble) || |
15925 | Context.hasSameType(ParamType, Context.CharTy) || |
15926 | Context.hasSameType(ParamType, Context.WideCharTy) || |
15927 | Context.hasSameType(ParamType, Context.Char8Ty) || |
15928 | Context.hasSameType(ParamType, Context.Char16Ty) || |
15929 | Context.hasSameType(ParamType, Context.Char32Ty)) { |
15930 | } else if (const PointerType *Ptr = ParamType->getAs<PointerType>()) { |
15931 | QualType InnerType = Ptr->getPointeeType(); |
15932 | |
15933 | // Pointer parameter must be a const char *. |
15934 | if (!(Context.hasSameType(InnerType.getUnqualifiedType(), |
15935 | Context.CharTy) && |
15936 | InnerType.isConstQualified() && !InnerType.isVolatileQualified())) { |
15937 | Diag(Param->getSourceRange().getBegin(), |
15938 | diag::err_literal_operator_param) |
15939 | << ParamType << "'const char *'" << Param->getSourceRange(); |
15940 | return true; |
15941 | } |
15942 | |
15943 | } else if (ParamType->isRealFloatingType()) { |
15944 | Diag(Param->getSourceRange().getBegin(), diag::err_literal_operator_param) |
15945 | << ParamType << Context.LongDoubleTy << Param->getSourceRange(); |
15946 | return true; |
15947 | |
15948 | } else if (ParamType->isIntegerType()) { |
15949 | Diag(Param->getSourceRange().getBegin(), diag::err_literal_operator_param) |
15950 | << ParamType << Context.UnsignedLongLongTy << Param->getSourceRange(); |
15951 | return true; |
15952 | |
15953 | } else { |
15954 | Diag(Param->getSourceRange().getBegin(), |
15955 | diag::err_literal_operator_invalid_param) |
15956 | << ParamType << Param->getSourceRange(); |
15957 | return true; |
15958 | } |
15959 | |
15960 | } else if (FnDecl->param_size() == 2) { |
15961 | FunctionDecl::param_iterator Param = FnDecl->param_begin(); |
15962 | |
15963 | // First, verify that the first parameter is correct. |
15964 | |
15965 | QualType FirstParamType = (*Param)->getType().getUnqualifiedType(); |
15966 | |
15967 | // Two parameter function must have a pointer to const as a |
15968 | // first parameter; let's strip those qualifiers. |
15969 | const PointerType *PT = FirstParamType->getAs<PointerType>(); |
15970 | |
15971 | if (!PT) { |
15972 | Diag((*Param)->getSourceRange().getBegin(), |
15973 | diag::err_literal_operator_param) |
15974 | << FirstParamType << "'const char *'" << (*Param)->getSourceRange(); |
15975 | return true; |
15976 | } |
15977 | |
15978 | QualType PointeeType = PT->getPointeeType(); |
15979 | // First parameter must be const |
15980 | if (!PointeeType.isConstQualified() || PointeeType.isVolatileQualified()) { |
15981 | Diag((*Param)->getSourceRange().getBegin(), |
15982 | diag::err_literal_operator_param) |
15983 | << FirstParamType << "'const char *'" << (*Param)->getSourceRange(); |
15984 | return true; |
15985 | } |
15986 | |
15987 | QualType InnerType = PointeeType.getUnqualifiedType(); |
15988 | // Only const char *, const wchar_t*, const char8_t*, const char16_t*, and |
15989 | // const char32_t* are allowed as the first parameter to a two-parameter |
15990 | // function |
15991 | if (!(Context.hasSameType(InnerType, Context.CharTy) || |
15992 | Context.hasSameType(InnerType, Context.WideCharTy) || |
15993 | Context.hasSameType(InnerType, Context.Char8Ty) || |
15994 | Context.hasSameType(InnerType, Context.Char16Ty) || |
15995 | Context.hasSameType(InnerType, Context.Char32Ty))) { |
15996 | Diag((*Param)->getSourceRange().getBegin(), |
15997 | diag::err_literal_operator_param) |
15998 | << FirstParamType << "'const char *'" << (*Param)->getSourceRange(); |
15999 | return true; |
16000 | } |
16001 | |
16002 | // Move on to the second and final parameter. |
16003 | ++Param; |
16004 | |
16005 | // The second parameter must be a std::size_t. |
16006 | QualType SecondParamType = (*Param)->getType().getUnqualifiedType(); |
16007 | if (!Context.hasSameType(SecondParamType, Context.getSizeType())) { |
16008 | Diag((*Param)->getSourceRange().getBegin(), |
16009 | diag::err_literal_operator_param) |
16010 | << SecondParamType << Context.getSizeType() |
16011 | << (*Param)->getSourceRange(); |
16012 | return true; |
16013 | } |
16014 | } else { |
16015 | Diag(FnDecl->getLocation(), diag::err_literal_operator_bad_param_count); |
16016 | return true; |
16017 | } |
16018 | |
16019 | // Parameters are good. |
16020 | |
16021 | // A parameter-declaration-clause containing a default argument is not |
16022 | // equivalent to any of the permitted forms. |
16023 | for (auto Param : FnDecl->parameters()) { |
16024 | if (Param->hasDefaultArg()) { |
16025 | Diag(Param->getDefaultArgRange().getBegin(), |
16026 | diag::err_literal_operator_default_argument) |
16027 | << Param->getDefaultArgRange(); |
16028 | break; |
16029 | } |
16030 | } |
16031 | |
16032 | StringRef LiteralName |
16033 | = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); |
16034 | if (LiteralName[0] != '_' && |
16035 | !getSourceManager().isInSystemHeader(FnDecl->getLocation())) { |
16036 | // C++11 [usrlit.suffix]p1: |
16037 | // Literal suffix identifiers that do not start with an underscore |
16038 | // are reserved for future standardization. |
16039 | Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved) |
16040 | << StringLiteralParser::isValidUDSuffix(getLangOpts(), LiteralName); |
16041 | } |
16042 | |
16043 | return false; |
16044 | } |
16045 | |
16046 | /// ActOnStartLinkageSpecification - Parsed the beginning of a C++ |
16047 | /// linkage specification, including the language and (if present) |
16048 | /// the '{'. ExternLoc is the location of the 'extern', Lang is the |
16049 | /// language string literal. LBraceLoc, if valid, provides the location of |
16050 | /// the '{' brace. Otherwise, this linkage specification does not |
16051 | /// have any braces. |
16052 | Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, |
16053 | Expr *LangStr, |
16054 | SourceLocation LBraceLoc) { |
16055 | StringLiteral *Lit = cast<StringLiteral>(LangStr); |
16056 | if (!Lit->isAscii()) { |
16057 | Diag(LangStr->getExprLoc(), diag::err_language_linkage_spec_not_ascii) |
16058 | << LangStr->getSourceRange(); |
16059 | return nullptr; |
16060 | } |
16061 | |
16062 | StringRef Lang = Lit->getString(); |
16063 | LinkageSpecDecl::LanguageIDs Language; |
16064 | if (Lang == "C") |
16065 | Language = LinkageSpecDecl::lang_c; |
16066 | else if (Lang == "C++") |
16067 | Language = LinkageSpecDecl::lang_cxx; |
16068 | else { |
16069 | Diag(LangStr->getExprLoc(), diag::err_language_linkage_spec_unknown) |
16070 | << LangStr->getSourceRange(); |
16071 | return nullptr; |
16072 | } |
16073 | |
16074 | // FIXME: Add all the various semantics of linkage specifications |
16075 | |
16076 | LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, ExternLoc, |
16077 | LangStr->getExprLoc(), Language, |
16078 | LBraceLoc.isValid()); |
16079 | CurContext->addDecl(D); |
16080 | PushDeclContext(S, D); |
16081 | return D; |
16082 | } |
16083 | |
16084 | /// ActOnFinishLinkageSpecification - Complete the definition of |
16085 | /// the C++ linkage specification LinkageSpec. If RBraceLoc is |
16086 | /// valid, it's the position of the closing '}' brace in a linkage |
16087 | /// specification that uses braces. |
16088 | Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, |
16089 | Decl *LinkageSpec, |
16090 | SourceLocation RBraceLoc) { |
16091 | if (RBraceLoc.isValid()) { |
16092 | LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); |
16093 | LSDecl->setRBraceLoc(RBraceLoc); |
16094 | } |
16095 | PopDeclContext(); |
16096 | return LinkageSpec; |
16097 | } |
16098 | |
16099 | Decl *Sema::ActOnEmptyDeclaration(Scope *S, |
16100 | const ParsedAttributesView &AttrList, |
16101 | SourceLocation SemiLoc) { |
16102 | Decl *ED = EmptyDecl::Create(Context, CurContext, SemiLoc); |
16103 | // Attribute declarations appertain to empty declaration so we handle |
16104 | // them here. |
16105 | ProcessDeclAttributeList(S, ED, AttrList); |
16106 | |
16107 | CurContext->addDecl(ED); |
16108 | return ED; |
16109 | } |
16110 | |
16111 | /// Perform semantic analysis for the variable declaration that |
16112 | /// occurs within a C++ catch clause, returning the newly-created |
16113 | /// variable. |
16114 | VarDecl *Sema::BuildExceptionDeclaration(Scope *S, |
16115 | TypeSourceInfo *TInfo, |
16116 | SourceLocation StartLoc, |
16117 | SourceLocation Loc, |
16118 | IdentifierInfo *Name) { |
16119 | bool Invalid = false; |
16120 | QualType ExDeclType = TInfo->getType(); |
16121 | |
16122 | // Arrays and functions decay. |
16123 | if (ExDeclType->isArrayType()) |
16124 | ExDeclType = Context.getArrayDecayedType(ExDeclType); |
16125 | else if (ExDeclType->isFunctionType()) |
16126 | ExDeclType = Context.getPointerType(ExDeclType); |
16127 | |
16128 | // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. |
16129 | // The exception-declaration shall not denote a pointer or reference to an |
16130 | // incomplete type, other than [cv] void*. |
16131 | // N2844 forbids rvalue references. |
16132 | if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { |
16133 | Diag(Loc, diag::err_catch_rvalue_ref); |
16134 | Invalid = true; |
16135 | } |
16136 | |
16137 | if (ExDeclType->isVariablyModifiedType()) { |
16138 | Diag(Loc, diag::err_catch_variably_modified) << ExDeclType; |
16139 | Invalid = true; |
16140 | } |
16141 | |
16142 | QualType BaseType = ExDeclType; |
16143 | int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference |
16144 | unsigned DK = diag::err_catch_incomplete; |
16145 | if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { |
16146 | BaseType = Ptr->getPointeeType(); |
16147 | Mode = 1; |
16148 | DK = diag::err_catch_incomplete_ptr; |
16149 | } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { |
16150 | // For the purpose of error recovery, we treat rvalue refs like lvalue refs. |
16151 | BaseType = Ref->getPointeeType(); |
16152 | Mode = 2; |
16153 | DK = diag::err_catch_incomplete_ref; |
16154 | } |
16155 | if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && |
16156 | !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) |
16157 | Invalid = true; |
16158 | |
16159 | if (!Invalid && Mode != 1 && BaseType->isSizelessType()) { |
16160 | Diag(Loc, diag::err_catch_sizeless) << (Mode == 2 ? 1 : 0) << BaseType; |
16161 | Invalid = true; |
16162 | } |
16163 | |
16164 | if (!Invalid && !ExDeclType->isDependentType() && |
16165 | RequireNonAbstractType(Loc, ExDeclType, |
16166 | diag::err_abstract_type_in_decl, |
16167 | AbstractVariableType)) |
16168 | Invalid = true; |
16169 | |
16170 | // Only the non-fragile NeXT runtime currently supports C++ catches |
16171 | // of ObjC types, and no runtime supports catching ObjC types by value. |
16172 | if (!Invalid && getLangOpts().ObjC) { |
16173 | QualType T = ExDeclType; |
16174 | if (const ReferenceType *RT = T->getAs<ReferenceType>()) |
16175 | T = RT->getPointeeType(); |
16176 | |
16177 | if (T->isObjCObjectType()) { |
16178 | Diag(Loc, diag::err_objc_object_catch); |
16179 | Invalid = true; |
16180 | } else if (T->isObjCObjectPointerType()) { |
16181 | // FIXME: should this be a test for macosx-fragile specifically? |
16182 | if (getLangOpts().ObjCRuntime.isFragile()) |
16183 | Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); |
16184 | } |
16185 | } |
16186 | |
16187 | VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, |
16188 | ExDeclType, TInfo, SC_None); |
16189 | ExDecl->setExceptionVariable(true); |
16190 | |
16191 | // In ARC, infer 'retaining' for variables of retainable type. |
16192 | if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) |
16193 | Invalid = true; |
16194 | |
16195 | if (!Invalid && !ExDeclType->isDependentType()) { |
16196 | if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { |
16197 | // Insulate this from anything else we might currently be parsing. |
16198 | EnterExpressionEvaluationContext scope( |
16199 | *this, ExpressionEvaluationContext::PotentiallyEvaluated); |
16200 | |
16201 | // C++ [except.handle]p16: |
16202 | // The object declared in an exception-declaration or, if the |
16203 | // exception-declaration does not specify a name, a temporary (12.2) is |
16204 | // copy-initialized (8.5) from the exception object. [...] |
16205 | // The object is destroyed when the handler exits, after the destruction |
16206 | // of any automatic objects initialized within the handler. |
16207 | // |
16208 | // We just pretend to initialize the object with itself, then make sure |
16209 | // it can be destroyed later. |
16210 | QualType initType = Context.getExceptionObjectType(ExDeclType); |
16211 | |
16212 | InitializedEntity entity = |
16213 | InitializedEntity::InitializeVariable(ExDecl); |
16214 | InitializationKind initKind = |
16215 | InitializationKind::CreateCopy(Loc, SourceLocation()); |
16216 | |
16217 | Expr *opaqueValue = |
16218 | new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); |
16219 | InitializationSequence sequence(*this, entity, initKind, opaqueValue); |
16220 | ExprResult result = sequence.Perform(*this, entity, initKind, opaqueValue); |
16221 | if (result.isInvalid()) |
16222 | Invalid = true; |
16223 | else { |
16224 | // If the constructor used was non-trivial, set this as the |
16225 | // "initializer". |
16226 | CXXConstructExpr *construct = result.getAs<CXXConstructExpr>(); |
16227 | if (!construct->getConstructor()->isTrivial()) { |
16228 | Expr *init = MaybeCreateExprWithCleanups(construct); |
16229 | ExDecl->setInit(init); |
16230 | } |
16231 | |
16232 | // And make sure it's destructable. |
16233 | FinalizeVarWithDestructor(ExDecl, recordType); |
16234 | } |
16235 | } |
16236 | } |
16237 | |
16238 | if (Invalid) |
16239 | ExDecl->setInvalidDecl(); |
16240 | |
16241 | return ExDecl; |
16242 | } |
16243 | |
16244 | /// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch |
16245 | /// handler. |
16246 | Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { |
16247 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); |
16248 | bool Invalid = D.isInvalidType(); |
16249 | |
16250 | // Check for unexpanded parameter packs. |
16251 | if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, |
16252 | UPPC_ExceptionType)) { |
16253 | TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, |
16254 | D.getIdentifierLoc()); |
16255 | Invalid = true; |
16256 | } |
16257 | |
16258 | IdentifierInfo *II = D.getIdentifier(); |
16259 | if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), |
16260 | LookupOrdinaryName, |
16261 | ForVisibleRedeclaration)) { |
16262 | // The scope should be freshly made just for us. There is just no way |
16263 | // it contains any previous declaration, except for function parameters in |
16264 | // a function-try-block's catch statement. |
16265 | assert(!S->isDeclScope(PrevDecl))((void)0); |
16266 | if (isDeclInScope(PrevDecl, CurContext, S)) { |
16267 | Diag(D.getIdentifierLoc(), diag::err_redefinition) |
16268 | << D.getIdentifier(); |
16269 | Diag(PrevDecl->getLocation(), diag::note_previous_definition); |
16270 | Invalid = true; |
16271 | } else if (PrevDecl->isTemplateParameter()) |
16272 | // Maybe we will complain about the shadowed template parameter. |
16273 | DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); |
16274 | } |
16275 | |
16276 | if (D.getCXXScopeSpec().isSet() && !Invalid) { |
16277 | Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) |
16278 | << D.getCXXScopeSpec().getRange(); |
16279 | Invalid = true; |
16280 | } |
16281 | |
16282 | VarDecl *ExDecl = BuildExceptionDeclaration( |
16283 | S, TInfo, D.getBeginLoc(), D.getIdentifierLoc(), D.getIdentifier()); |
16284 | if (Invalid) |
16285 | ExDecl->setInvalidDecl(); |
16286 | |
16287 | // Add the exception declaration into this scope. |
16288 | if (II) |
16289 | PushOnScopeChains(ExDecl, S); |
16290 | else |
16291 | CurContext->addDecl(ExDecl); |
16292 | |
16293 | ProcessDeclAttributes(S, ExDecl, D); |
16294 | return ExDecl; |
16295 | } |
16296 | |
16297 | Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, |
16298 | Expr *AssertExpr, |
16299 | Expr *AssertMessageExpr, |
16300 | SourceLocation RParenLoc) { |
16301 | StringLiteral *AssertMessage = |
16302 | AssertMessageExpr ? cast<StringLiteral>(AssertMessageExpr) : nullptr; |
16303 | |
16304 | if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) |
16305 | return nullptr; |
16306 | |
16307 | return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, |
16308 | AssertMessage, RParenLoc, false); |
16309 | } |
16310 | |
16311 | Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, |
16312 | Expr *AssertExpr, |
16313 | StringLiteral *AssertMessage, |
16314 | SourceLocation RParenLoc, |
16315 | bool Failed) { |
16316 | assert(AssertExpr != nullptr && "Expected non-null condition")((void)0); |
16317 | if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && |
16318 | !Failed) { |
16319 | // In a static_assert-declaration, the constant-expression shall be a |
16320 | // constant expression that can be contextually converted to bool. |
16321 | ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); |
16322 | if (Converted.isInvalid()) |
16323 | Failed = true; |
16324 | |
16325 | ExprResult FullAssertExpr = |
16326 | ActOnFinishFullExpr(Converted.get(), StaticAssertLoc, |
16327 | /*DiscardedValue*/ false, |
16328 | /*IsConstexpr*/ true); |
16329 | if (FullAssertExpr.isInvalid()) |
16330 | Failed = true; |
16331 | else |
16332 | AssertExpr = FullAssertExpr.get(); |
16333 | |
16334 | llvm::APSInt Cond; |
16335 | if (!Failed && VerifyIntegerConstantExpression( |
16336 | AssertExpr, &Cond, |
16337 | diag::err_static_assert_expression_is_not_constant) |
16338 | .isInvalid()) |
16339 | Failed = true; |
16340 | |
16341 | if (!Failed && !Cond) { |
16342 | SmallString<256> MsgBuffer; |
16343 | llvm::raw_svector_ostream Msg(MsgBuffer); |
16344 | if (AssertMessage) |
16345 | AssertMessage->printPretty(Msg, nullptr, getPrintingPolicy()); |
16346 | |
16347 | Expr *InnerCond = nullptr; |
16348 | std::string InnerCondDescription; |
16349 | std::tie(InnerCond, InnerCondDescription) = |
16350 | findFailedBooleanCondition(Converted.get()); |
16351 | if (InnerCond && isa<ConceptSpecializationExpr>(InnerCond)) { |
16352 | // Drill down into concept specialization expressions to see why they |
16353 | // weren't satisfied. |
16354 | Diag(StaticAssertLoc, diag::err_static_assert_failed) |
16355 | << !AssertMessage << Msg.str() << AssertExpr->getSourceRange(); |
16356 | ConstraintSatisfaction Satisfaction; |
16357 | if (!CheckConstraintSatisfaction(InnerCond, Satisfaction)) |
16358 | DiagnoseUnsatisfiedConstraint(Satisfaction); |
16359 | } else if (InnerCond && !isa<CXXBoolLiteralExpr>(InnerCond) |
16360 | && !isa<IntegerLiteral>(InnerCond)) { |
16361 | Diag(StaticAssertLoc, diag::err_static_assert_requirement_failed) |
16362 | << InnerCondDescription << !AssertMessage |
16363 | << Msg.str() << InnerCond->getSourceRange(); |
16364 | } else { |
16365 | Diag(StaticAssertLoc, diag::err_static_assert_failed) |
16366 | << !AssertMessage << Msg.str() << AssertExpr->getSourceRange(); |
16367 | } |
16368 | Failed = true; |
16369 | } |
16370 | } else { |
16371 | ExprResult FullAssertExpr = ActOnFinishFullExpr(AssertExpr, StaticAssertLoc, |
16372 | /*DiscardedValue*/false, |
16373 | /*IsConstexpr*/true); |
16374 | if (FullAssertExpr.isInvalid()) |
16375 | Failed = true; |
16376 | else |
16377 | AssertExpr = FullAssertExpr.get(); |
16378 | } |
16379 | |
16380 | Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, |
16381 | AssertExpr, AssertMessage, RParenLoc, |
16382 | Failed); |
16383 | |
16384 | CurContext->addDecl(Decl); |
16385 | return Decl; |
16386 | } |
16387 | |
16388 | /// Perform semantic analysis of the given friend type declaration. |
16389 | /// |
16390 | /// \returns A friend declaration that. |
16391 | FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, |
16392 | SourceLocation FriendLoc, |
16393 | TypeSourceInfo *TSInfo) { |
16394 | assert(TSInfo && "NULL TypeSourceInfo for friend type declaration")((void)0); |
16395 | |
16396 | QualType T = TSInfo->getType(); |
16397 | SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); |
16398 | |
16399 | // C++03 [class.friend]p2: |
16400 | // An elaborated-type-specifier shall be used in a friend declaration |
16401 | // for a class.* |
16402 | // |
16403 | // * The class-key of the elaborated-type-specifier is required. |
16404 | if (!CodeSynthesisContexts.empty()) { |
16405 | // Do not complain about the form of friend template types during any kind |
16406 | // of code synthesis. For template instantiation, we will have complained |
16407 | // when the template was defined. |
16408 | } else { |
16409 | if (!T->isElaboratedTypeSpecifier()) { |
16410 | // If we evaluated the type to a record type, suggest putting |
16411 | // a tag in front. |
16412 | if (const RecordType *RT = T->getAs<RecordType>()) { |
16413 | RecordDecl *RD = RT->getDecl(); |
16414 | |
16415 | SmallString<16> InsertionText(" "); |
16416 | InsertionText += RD->getKindName(); |
16417 | |
16418 | Diag(TypeRange.getBegin(), |
16419 | getLangOpts().CPlusPlus11 ? |
16420 | diag::warn_cxx98_compat_unelaborated_friend_type : |
16421 | diag::ext_unelaborated_friend_type) |
16422 | << (unsigned) RD->getTagKind() |
16423 | << T |
16424 | << FixItHint::CreateInsertion(getLocForEndOfToken(FriendLoc), |
16425 | InsertionText); |
16426 | } else { |
16427 | Diag(FriendLoc, |
16428 | getLangOpts().CPlusPlus11 ? |
16429 | diag::warn_cxx98_compat_nonclass_type_friend : |
16430 | diag::ext_nonclass_type_friend) |
16431 | << T |
16432 | << TypeRange; |
16433 | } |
16434 | } else if (T->getAs<EnumType>()) { |
16435 | Diag(FriendLoc, |
16436 | getLangOpts().CPlusPlus11 ? |
16437 | diag::warn_cxx98_compat_enum_friend : |
16438 | diag::ext_enum_friend) |
16439 | << T |
16440 | << TypeRange; |
16441 | } |
16442 | |
16443 | // C++11 [class.friend]p3: |
16444 | // A friend declaration that does not declare a function shall have one |
16445 | // of the following forms: |
16446 | // friend elaborated-type-specifier ; |
16447 | // friend simple-type-specifier ; |
16448 | // friend typename-specifier ; |
16449 | if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc) |
16450 | Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; |
16451 | } |
16452 | |
16453 | // If the type specifier in a friend declaration designates a (possibly |
16454 | // cv-qualified) class type, that class is declared as a friend; otherwise, |
16455 | // the friend declaration is ignored. |
16456 | return FriendDecl::Create(Context, CurContext, |
16457 | TSInfo->getTypeLoc().getBeginLoc(), TSInfo, |
16458 | FriendLoc); |
16459 | } |
16460 | |
16461 | /// Handle a friend tag declaration where the scope specifier was |
16462 | /// templated. |
16463 | Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, |
16464 | unsigned TagSpec, SourceLocation TagLoc, |
16465 | CXXScopeSpec &SS, IdentifierInfo *Name, |
16466 | SourceLocation NameLoc, |
16467 | const ParsedAttributesView &Attr, |
16468 | MultiTemplateParamsArg TempParamLists) { |
16469 | TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); |
16470 | |
16471 | bool IsMemberSpecialization = false; |
16472 | bool Invalid = false; |
16473 | |
16474 | if (TemplateParameterList *TemplateParams = |
16475 | MatchTemplateParametersToScopeSpecifier( |
16476 | TagLoc, NameLoc, SS, nullptr, TempParamLists, /*friend*/ true, |
16477 | IsMemberSpecialization, Invalid)) { |
16478 | if (TemplateParams->size() > 0) { |
16479 | // This is a declaration of a class template. |
16480 | if (Invalid) |
16481 | return nullptr; |
16482 | |
16483 | return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, SS, Name, |
16484 | NameLoc, Attr, TemplateParams, AS_public, |
16485 | /*ModulePrivateLoc=*/SourceLocation(), |
16486 | FriendLoc, TempParamLists.size() - 1, |
16487 | TempParamLists.data()).get(); |
16488 | } else { |
16489 | // The "template<>" header is extraneous. |
16490 | Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) |
16491 | << TypeWithKeyword::getTagTypeKindName(Kind) << Name; |
16492 | IsMemberSpecialization = true; |
Value stored to 'IsMemberSpecialization' is never read | |
16493 | } |
16494 | } |
16495 | |
16496 | if (Invalid) return nullptr; |
16497 | |
16498 | bool isAllExplicitSpecializations = true; |
16499 | for (unsigned I = TempParamLists.size(); I-- > 0; ) { |
16500 | if (TempParamLists[I]->size()) { |
16501 | isAllExplicitSpecializations = false; |
16502 | break; |
16503 | } |
16504 | } |
16505 | |
16506 | // FIXME: don't ignore attributes. |
16507 | |
16508 | // If it's explicit specializations all the way down, just forget |
16509 | // about the template header and build an appropriate non-templated |
16510 | // friend. TODO: for source fidelity, remember the headers. |
16511 | if (isAllExplicitSpecializations) { |
16512 | if (SS.isEmpty()) { |
16513 | bool Owned = false; |
16514 | bool IsDependent = false; |
16515 | return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, |
16516 | Attr, AS_public, |
16517 | /*ModulePrivateLoc=*/SourceLocation(), |
16518 | MultiTemplateParamsArg(), Owned, IsDependent, |
16519 | /*ScopedEnumKWLoc=*/SourceLocation(), |
16520 | /*ScopedEnumUsesClassTag=*/false, |
16521 | /*UnderlyingType=*/TypeResult(), |
16522 | /*IsTypeSpecifier=*/false, |
16523 | /*IsTemplateParamOrArg=*/false); |
16524 | } |
16525 | |
16526 | NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); |
16527 | ElaboratedTypeKeyword Keyword |
16528 | = TypeWithKeyword::getKeywordForTagTypeKind(Kind); |
16529 | QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, |
16530 | *Name, NameLoc); |
16531 | if (T.isNull()) |
16532 | return nullptr; |
16533 | |
16534 | TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); |
16535 | if (isa<DependentNameType>(T)) { |
16536 | DependentNameTypeLoc TL = |
16537 | TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); |
16538 | TL.setElaboratedKeywordLoc(TagLoc); |
16539 | TL.setQualifierLoc(QualifierLoc); |
16540 | TL.setNameLoc(NameLoc); |
16541 | } else { |
16542 | ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>(); |
16543 | TL.setElaboratedKeywordLoc(TagLoc); |
16544 | TL.setQualifierLoc(QualifierLoc); |
16545 | TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(NameLoc); |
16546 | } |
16547 | |
16548 | FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, |
16549 | TSI, FriendLoc, TempParamLists); |
16550 | Friend->setAccess(AS_public); |
16551 | CurContext->addDecl(Friend); |
16552 | return Friend; |
16553 | } |
16554 | |
16555 | assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?")((void)0); |
16556 | |
16557 | |
16558 | |
16559 | // Handle the case of a templated-scope friend class. e.g. |
16560 | // template <class T> class A<T>::B; |
16561 | // FIXME: we don't support these right now. |
16562 | Diag(NameLoc, diag::warn_template_qualified_friend_unsupported) |
16563 | << SS.getScopeRep() << SS.getRange() << cast<CXXRecordDecl>(CurContext); |
16564 | ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); |
16565 | QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); |
16566 | TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); |
16567 | DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); |
16568 | TL.setElaboratedKeywordLoc(TagLoc); |
16569 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); |
16570 | TL.setNameLoc(NameLoc); |
16571 | |
16572 | FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, |
16573 | TSI, FriendLoc, TempParamLists); |
16574 | Friend->setAccess(AS_public); |
16575 | Friend->setUnsupportedFriend(true); |
16576 | CurContext->addDecl(Friend); |
16577 | return Friend; |
16578 | } |
16579 | |
16580 | /// Handle a friend type declaration. This works in tandem with |
16581 | /// ActOnTag. |
16582 | /// |
16583 | /// Notes on friend class templates: |
16584 | /// |
16585 | /// We generally treat friend class declarations as if they were |
16586 | /// declaring a class. So, for example, the elaborated type specifier |
16587 | /// in a friend declaration is required to obey the restrictions of a |
16588 | /// class-head (i.e. no typedefs in the scope chain), template |
16589 | /// parameters are required to match up with simple template-ids, &c. |
16590 | /// However, unlike when declaring a template specialization, it's |
16591 | /// okay to refer to a template specialization without an empty |
16592 | /// template parameter declaration, e.g. |
16593 | /// friend class A<T>::B<unsigned>; |
16594 | /// We permit this as a special case; if there are any template |
16595 | /// parameters present at all, require proper matching, i.e. |
16596 | /// template <> template \<class T> friend class A<int>::B; |
16597 | Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, |
16598 | MultiTemplateParamsArg TempParams) { |
16599 | SourceLocation Loc = DS.getBeginLoc(); |
16600 | |
16601 | assert(DS.isFriendSpecified())((void)0); |
16602 | assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified)((void)0); |
16603 | |
16604 | // C++ [class.friend]p3: |
16605 | // A friend declaration that does not declare a function shall have one of |
16606 | // the following forms: |
16607 | // friend elaborated-type-specifier ; |
16608 | // friend simple-type-specifier ; |
16609 | // friend typename-specifier ; |
16610 | // |
16611 | // Any declaration with a type qualifier does not have that form. (It's |
16612 | // legal to specify a qualified type as a friend, you just can't write the |
16613 | // keywords.) |
16614 | if (DS.getTypeQualifiers()) { |
16615 | if (DS.getTypeQualifiers() & DeclSpec::TQ_const) |
16616 | Diag(DS.getConstSpecLoc(), diag::err_friend_decl_spec) << "const"; |
16617 | if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) |
16618 | Diag(DS.getVolatileSpecLoc(), diag::err_friend_decl_spec) << "volatile"; |
16619 | if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) |
16620 | Diag(DS.getRestrictSpecLoc(), diag::err_friend_decl_spec) << "restrict"; |
16621 | if (DS.getTypeQualifiers() & DeclSpec::TQ_atomic) |
16622 | Diag(DS.getAtomicSpecLoc(), diag::err_friend_decl_spec) << "_Atomic"; |
16623 | if (DS.getTypeQualifiers() & DeclSpec::TQ_unaligned) |
16624 | Diag(DS.getUnalignedSpecLoc(), diag::err_friend_decl_spec) << "__unaligned"; |
16625 | } |
16626 | |
16627 | // Try to convert the decl specifier to a type. This works for |
16628 | // friend templates because ActOnTag never produces a ClassTemplateDecl |
16629 | // for a TUK_Friend. |
16630 | Declarator TheDeclarator(DS, DeclaratorContext::Member); |
16631 | TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); |
16632 | QualType T = TSI->getType(); |
16633 | if (TheDeclarator.isInvalidType()) |
16634 | return nullptr; |
16635 | |
16636 | if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) |
16637 | return nullptr; |
16638 | |
16639 | // This is definitely an error in C++98. It's probably meant to |
16640 | // be forbidden in C++0x, too, but the specification is just |
16641 | // poorly written. |
16642 | // |
16643 | // The problem is with declarations like the following: |
16644 | // template <T> friend A<T>::foo; |
16645 | // where deciding whether a class C is a friend or not now hinges |
16646 | // on whether there exists an instantiation of A that causes |
16647 | // 'foo' to equal C. There are restrictions on class-heads |
16648 | // (which we declare (by fiat) elaborated friend declarations to |
16649 | // be) that makes this tractable. |
16650 | // |
16651 | // FIXME: handle "template <> friend class A<T>;", which |
16652 | // is possibly well-formed? Who even knows? |
16653 | if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { |
16654 | Diag(Loc, diag::err_tagless_friend_type_template) |
16655 | << DS.getSourceRange(); |
16656 | return nullptr; |
16657 | } |
16658 | |
16659 | // C++98 [class.friend]p1: A friend of a class is a function |
16660 | // or class that is not a member of the class . . . |
16661 | // This is fixed in DR77, which just barely didn't make the C++03 |
16662 | // deadline. It's also a very silly restriction that seriously |
16663 | // affects inner classes and which nobody else seems to implement; |
16664 | // thus we never diagnose it, not even in -pedantic. |
16665 | // |
16666 | // But note that we could warn about it: it's always useless to |
16667 | // friend one of your own members (it's not, however, worthless to |
16668 | // friend a member of an arbitrary specialization of your template). |
16669 | |
16670 | Decl *D; |
16671 | if (!TempParams.empty()) |
16672 | D = FriendTemplateDecl::Create(Context, CurContext, Loc, |
16673 | TempParams, |
16674 | TSI, |
16675 | DS.getFriendSpecLoc()); |
16676 | else |
16677 | D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); |
16678 | |
16679 | if (!D) |
16680 | return nullptr; |
16681 | |
16682 | D->setAccess(AS_public); |
16683 | CurContext->addDecl(D); |
16684 | |
16685 | return D; |
16686 | } |
16687 | |
16688 | NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, |
16689 | MultiTemplateParamsArg TemplateParams) { |
16690 | const DeclSpec &DS = D.getDeclSpec(); |
16691 | |
16692 | assert(DS.isFriendSpecified())((void)0); |
16693 | assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified)((void)0); |
16694 | |
16695 | SourceLocation Loc = D.getIdentifierLoc(); |
16696 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); |
16697 | |
16698 | // C++ [class.friend]p1 |
16699 | // A friend of a class is a function or class.... |
16700 | // Note that this sees through typedefs, which is intended. |
16701 | // It *doesn't* see through dependent types, which is correct |
16702 | // according to [temp.arg.type]p3: |
16703 | // If a declaration acquires a function type through a |
16704 | // type dependent on a template-parameter and this causes |
16705 | // a declaration that does not use the syntactic form of a |
16706 | // function declarator to have a function type, the program |
16707 | // is ill-formed. |
16708 | if (!TInfo->getType()->isFunctionType()) { |
16709 | Diag(Loc, diag::err_unexpected_friend); |
16710 | |
16711 | // It might be worthwhile to try to recover by creating an |
16712 | // appropriate declaration. |
16713 | return nullptr; |
16714 | } |
16715 | |
16716 | // C++ [namespace.memdef]p3 |
16717 | // - If a friend declaration in a non-local class first declares a |
16718 | // class or function, the friend class or function is a member |
16719 | // of the innermost enclosing namespace. |
16720 | // - The name of the friend is not found by simple name lookup |
16721 | // until a matching declaration is provided in that namespace |
16722 | // scope (either before or after the class declaration granting |
16723 | // friendship). |
16724 | // - If a friend function is called, its name may be found by the |
16725 | // name lookup that considers functions from namespaces and |
16726 | // classes associated with the types of the function arguments. |
16727 | // - When looking for a prior declaration of a class or a function |
16728 | // declared as a friend, scopes outside the innermost enclosing |
16729 | // namespace scope are not considered. |
16730 | |
16731 | CXXScopeSpec &SS = D.getCXXScopeSpec(); |
16732 | DeclarationNameInfo NameInfo = GetNameForDeclarator(D); |
16733 | assert(NameInfo.getName())((void)0); |
16734 | |
16735 | // Check for unexpanded parameter packs. |
16736 | if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || |
16737 | DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || |
16738 | DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) |
16739 | return nullptr; |
16740 | |
16741 | // The context we found the declaration in, or in which we should |
16742 | // create the declaration. |
16743 | DeclContext *DC; |
16744 | Scope *DCScope = S; |
16745 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName, |
16746 | ForExternalRedeclaration); |
16747 | |
16748 | // There are five cases here. |
16749 | // - There's no scope specifier and we're in a local class. Only look |
16750 | // for functions declared in the immediately-enclosing block scope. |
16751 | // We recover from invalid scope qualifiers as if they just weren't there. |
16752 | FunctionDecl *FunctionContainingLocalClass = nullptr; |
16753 | if ((SS.isInvalid() || !SS.isSet()) && |
16754 | (FunctionContainingLocalClass = |
16755 | cast<CXXRecordDecl>(CurContext)->isLocalClass())) { |
16756 | // C++11 [class.friend]p11: |
16757 | // If a friend declaration appears in a local class and the name |
16758 | // specified is an unqualified name, a prior declaration is |
16759 | // looked up without considering scopes that are outside the |
16760 | // innermost enclosing non-class scope. For a friend function |
16761 | // declaration, if there is no prior declaration, the program is |
16762 | // ill-formed. |
16763 | |
16764 | // Find the innermost enclosing non-class scope. This is the block |
16765 | // scope containing the local class definition (or for a nested class, |
16766 | // the outer local class). |
16767 | DCScope = S->getFnParent(); |
16768 | |
16769 | // Look up the function name in the scope. |
16770 | Previous.clear(LookupLocalFriendName); |
16771 | LookupName(Previous, S, /*AllowBuiltinCreation*/false); |
16772 | |
16773 | if (!Previous.empty()) { |
16774 | // All possible previous declarations must have the same context: |
16775 | // either they were declared at block scope or they are members of |
16776 | // one of the enclosing local classes. |
16777 | DC = Previous.getRepresentativeDecl()->getDeclContext(); |
16778 | } else { |
16779 | // This is ill-formed, but provide the context that we would have |
16780 | // declared the function in, if we were permitted to, for error recovery. |
16781 | DC = FunctionContainingLocalClass; |
16782 | } |
16783 | adjustContextForLocalExternDecl(DC); |
16784 | |
16785 | // C++ [class.friend]p6: |
16786 | // A function can be defined in a friend declaration of a class if and |
16787 | // only if the class is a non-local class (9.8), the function name is |
16788 | // unqualified, and the function has namespace scope. |
16789 | if (D.isFunctionDefinition()) { |
16790 | Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); |
16791 | } |
16792 | |
16793 | // - There's no scope specifier, in which case we just go to the |
16794 | // appropriate scope and look for a function or function template |
16795 | // there as appropriate. |
16796 | } else if (SS.isInvalid() || !SS.isSet()) { |
16797 | // C++11 [namespace.memdef]p3: |
16798 | // If the name in a friend declaration is neither qualified nor |
16799 | // a template-id and the declaration is a function or an |
16800 | // elaborated-type-specifier, the lookup to determine whether |
16801 | // the entity has been previously declared shall not consider |
16802 | // any scopes outside the innermost enclosing namespace. |
16803 | bool isTemplateId = |
16804 | D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId; |
16805 | |
16806 | // Find the appropriate context according to the above. |
16807 | DC = CurContext; |
16808 | |
16809 | // Skip class contexts. If someone can cite chapter and verse |
16810 | // for this behavior, that would be nice --- it's what GCC and |
16811 | // EDG do, and it seems like a reasonable intent, but the spec |
16812 | // really only says that checks for unqualified existing |
16813 | // declarations should stop at the nearest enclosing namespace, |
16814 | // not that they should only consider the nearest enclosing |
16815 | // namespace. |
16816 | while (DC->isRecord()) |
16817 | DC = DC->getParent(); |
16818 | |
16819 | DeclContext *LookupDC = DC; |
16820 | while (LookupDC->isTransparentContext()) |
16821 | LookupDC = LookupDC->getParent(); |
16822 | |
16823 | while (true) { |
16824 | LookupQualifiedName(Previous, LookupDC); |
16825 | |
16826 | if (!Previous.empty()) { |
16827 | DC = LookupDC; |
16828 | break; |
16829 | } |
16830 | |
16831 | if (isTemplateId) { |
16832 | if (isa<TranslationUnitDecl>(LookupDC)) break; |
16833 | } else { |
16834 | if (LookupDC->isFileContext()) break; |
16835 | } |
16836 | LookupDC = LookupDC->getParent(); |
16837 | } |
16838 | |
16839 | DCScope = getScopeForDeclContext(S, DC); |
16840 | |
16841 | // - There's a non-dependent scope specifier, in which case we |
16842 | // compute it and do a previous lookup there for a function |
16843 | // or function template. |
16844 | } else if (!SS.getScopeRep()->isDependent()) { |
16845 | DC = computeDeclContext(SS); |
16846 | if (!DC) return nullptr; |
16847 | |
16848 | if (RequireCompleteDeclContext(SS, DC)) return nullptr; |
16849 | |
16850 | LookupQualifiedName(Previous, DC); |
16851 | |
16852 | // C++ [class.friend]p1: A friend of a class is a function or |
16853 | // class that is not a member of the class . . . |
16854 | if (DC->Equals(CurContext)) |
16855 | Diag(DS.getFriendSpecLoc(), |
16856 | getLangOpts().CPlusPlus11 ? |
16857 | diag::warn_cxx98_compat_friend_is_member : |
16858 | diag::err_friend_is_member); |
16859 | |
16860 | if (D.isFunctionDefinition()) { |
16861 | // C++ [class.friend]p6: |
16862 | // A function can be defined in a friend declaration of a class if and |
16863 | // only if the class is a non-local class (9.8), the function name is |
16864 | // unqualified, and the function has namespace scope. |
16865 | // |
16866 | // FIXME: We should only do this if the scope specifier names the |
16867 | // innermost enclosing namespace; otherwise the fixit changes the |
16868 | // meaning of the code. |
16869 | SemaDiagnosticBuilder DB |
16870 | = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); |
16871 | |
16872 | DB << SS.getScopeRep(); |
16873 | if (DC->isFileContext()) |
16874 | DB << FixItHint::CreateRemoval(SS.getRange()); |
16875 | SS.clear(); |
16876 | } |
16877 | |
16878 | // - There's a scope specifier that does not match any template |
16879 | // parameter lists, in which case we use some arbitrary context, |
16880 | // create a method or method template, and wait for instantiation. |
16881 | // - There's a scope specifier that does match some template |
16882 | // parameter lists, which we don't handle right now. |
16883 | } else { |
16884 | if (D.isFunctionDefinition()) { |
16885 | // C++ [class.friend]p6: |
16886 | // A function can be defined in a friend declaration of a class if and |
16887 | // only if the class is a non-local class (9.8), the function name is |
16888 | // unqualified, and the function has namespace scope. |
16889 | Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) |
16890 | << SS.getScopeRep(); |
16891 | } |
16892 | |
16893 | DC = CurContext; |
16894 | assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?")((void)0); |
16895 | } |
16896 | |
16897 | if (!DC->isRecord()) { |
16898 | int DiagArg = -1; |
16899 | switch (D.getName().getKind()) { |
16900 | case UnqualifiedIdKind::IK_ConstructorTemplateId: |
16901 | case UnqualifiedIdKind::IK_ConstructorName: |
16902 | DiagArg = 0; |
16903 | break; |
16904 | case UnqualifiedIdKind::IK_DestructorName: |
16905 | DiagArg = 1; |
16906 | break; |
16907 | case UnqualifiedIdKind::IK_ConversionFunctionId: |
16908 | DiagArg = 2; |
16909 | break; |
16910 | case UnqualifiedIdKind::IK_DeductionGuideName: |
16911 | DiagArg = 3; |
16912 | break; |
16913 | case UnqualifiedIdKind::IK_Identifier: |
16914 | case UnqualifiedIdKind::IK_ImplicitSelfParam: |
16915 | case UnqualifiedIdKind::IK_LiteralOperatorId: |
16916 | case UnqualifiedIdKind::IK_OperatorFunctionId: |
16917 | case UnqualifiedIdKind::IK_TemplateId: |
16918 | break; |
16919 | } |
16920 | // This implies that it has to be an operator or function. |
16921 | if (DiagArg >= 0) { |
16922 | Diag(Loc, diag::err_introducing_special_friend) << DiagArg; |
16923 | return nullptr; |
16924 | } |
16925 | } |
16926 | |
16927 | // FIXME: This is an egregious hack to cope with cases where the scope stack |
16928 | // does not contain the declaration context, i.e., in an out-of-line |
16929 | // definition of a class. |
16930 | Scope FakeDCScope(S, Scope::DeclScope, Diags); |
16931 | if (!DCScope) { |
16932 | FakeDCScope.setEntity(DC); |
16933 | DCScope = &FakeDCScope; |
16934 | } |
16935 | |
16936 | bool AddToScope = true; |
16937 | NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, |
16938 | TemplateParams, AddToScope); |
16939 | if (!ND) return nullptr; |
16940 | |
16941 | assert(ND->getLexicalDeclContext() == CurContext)((void)0); |
16942 | |
16943 | // If we performed typo correction, we might have added a scope specifier |
16944 | // and changed the decl context. |
16945 | DC = ND->getDeclContext(); |
16946 | |
16947 | // Add the function declaration to the appropriate lookup tables, |
16948 | // adjusting the redeclarations list as necessary. We don't |
16949 | // want to do this yet if the friending class is dependent. |
16950 | // |
16951 | // Also update the scope-based lookup if the target context's |
16952 | // lookup context is in lexical scope. |
16953 | if (!CurContext->isDependentContext()) { |
16954 | DC = DC->getRedeclContext(); |
16955 | DC->makeDeclVisibleInContext(ND); |
16956 | if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) |
16957 | PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); |
16958 | } |
16959 | |
16960 | FriendDecl *FrD = FriendDecl::Create(Context, CurContext, |
16961 | D.getIdentifierLoc(), ND, |
16962 | DS.getFriendSpecLoc()); |
16963 | FrD->setAccess(AS_public); |
16964 | CurContext->addDecl(FrD); |
16965 | |
16966 | if (ND->isInvalidDecl()) { |
16967 | FrD->setInvalidDecl(); |
16968 | } else { |
16969 | if (DC->isRecord()) CheckFriendAccess(ND); |
16970 | |
16971 | FunctionDecl *FD; |
16972 | if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) |
16973 | FD = FTD->getTemplatedDecl(); |
16974 | else |
16975 | FD = cast<FunctionDecl>(ND); |
16976 | |
16977 | // C++11 [dcl.fct.default]p4: If a friend declaration specifies a |
16978 | // default argument expression, that declaration shall be a definition |
16979 | // and shall be the only declaration of the function or function |
16980 | // template in the translation unit. |
16981 | if (functionDeclHasDefaultArgument(FD)) { |
16982 | // We can't look at FD->getPreviousDecl() because it may not have been set |
16983 | // if we're in a dependent context. If the function is known to be a |
16984 | // redeclaration, we will have narrowed Previous down to the right decl. |
16985 | if (D.isRedeclaration()) { |
16986 | Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_redeclared); |
16987 | Diag(Previous.getRepresentativeDecl()->getLocation(), |
16988 | diag::note_previous_declaration); |
16989 | } else if (!D.isFunctionDefinition()) |
16990 | Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_must_be_def); |
16991 | } |
16992 | |
16993 | // Mark templated-scope function declarations as unsupported. |
16994 | if (FD->getNumTemplateParameterLists() && SS.isValid()) { |
16995 | Diag(FD->getLocation(), diag::warn_template_qualified_friend_unsupported) |
16996 | << SS.getScopeRep() << SS.getRange() |
16997 | << cast<CXXRecordDecl>(CurContext); |
16998 | FrD->setUnsupportedFriend(true); |
16999 | } |
17000 | } |
17001 | |
17002 | warnOnReservedIdentifier(ND); |
17003 | |
17004 | return ND; |
17005 | } |
17006 | |
17007 | void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { |
17008 | AdjustDeclIfTemplate(Dcl); |
17009 | |
17010 | FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl); |
17011 | if (!Fn) { |
17012 | Diag(DelLoc, diag::err_deleted_non_function); |
17013 | return; |
17014 | } |
17015 | |
17016 | // Deleted function does not have a body. |
17017 | Fn->setWillHaveBody(false); |
17018 | |
17019 | if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { |
17020 | // Don't consider the implicit declaration we generate for explicit |
17021 | // specializations. FIXME: Do not generate these implicit declarations. |
17022 | if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization || |
17023 | Prev->getPreviousDecl()) && |
17024 | !Prev->isDefined()) { |
17025 | Diag(DelLoc, diag::err_deleted_decl_not_first); |
17026 | Diag(Prev->getLocation().isInvalid() ? DelLoc : Prev->getLocation(), |
17027 | Prev->isImplicit() ? diag::note_previous_implicit_declaration |
17028 | : diag::note_previous_declaration); |
17029 | // We can't recover from this; the declaration might have already |
17030 | // been used. |
17031 | Fn->setInvalidDecl(); |
17032 | return; |
17033 | } |
17034 | |
17035 | // To maintain the invariant that functions are only deleted on their first |
17036 | // declaration, mark the implicitly-instantiated declaration of the |
17037 | // explicitly-specialized function as deleted instead of marking the |
17038 | // instantiated redeclaration. |
17039 | Fn = Fn->getCanonicalDecl(); |
17040 | } |
17041 | |
17042 | // dllimport/dllexport cannot be deleted. |
17043 | if (const InheritableAttr *DLLAttr = getDLLAttr(Fn)) { |
17044 | Diag(Fn->getLocation(), diag::err_attribute_dll_deleted) << DLLAttr; |
17045 | Fn->setInvalidDecl(); |
17046 | } |
17047 | |
17048 | // C++11 [basic.start.main]p3: |
17049 | // A program that defines main as deleted [...] is ill-formed. |
17050 | if (Fn->isMain()) |
17051 | Diag(DelLoc, diag::err_deleted_main); |
17052 | |
17053 | // C++11 [dcl.fct.def.delete]p4: |
17054 | // A deleted function is implicitly inline. |
17055 | Fn->setImplicitlyInline(); |
17056 | Fn->setDeletedAsWritten(); |
17057 | } |
17058 | |
17059 | void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { |
17060 | if (!Dcl || Dcl->isInvalidDecl()) |
17061 | return; |
17062 | |
17063 | auto *FD = dyn_cast<FunctionDecl>(Dcl); |
17064 | if (!FD) { |
17065 | if (auto *FTD = dyn_cast<FunctionTemplateDecl>(Dcl)) { |
17066 | if (getDefaultedFunctionKind(FTD->getTemplatedDecl()).isComparison()) { |
17067 | Diag(DefaultLoc, diag::err_defaulted_comparison_template); |
17068 | return; |
17069 | } |
17070 | } |
17071 | |
17072 | Diag(DefaultLoc, diag::err_default_special_members) |
17073 | << getLangOpts().CPlusPlus20; |
17074 | return; |
17075 | } |
17076 | |
17077 | // Reject if this can't possibly be a defaultable function. |
17078 | DefaultedFunctionKind DefKind = getDefaultedFunctionKind(FD); |
17079 | if (!DefKind && |
17080 | // A dependent function that doesn't locally look defaultable can |
17081 | // still instantiate to a defaultable function if it's a constructor |
17082 | // or assignment operator. |
17083 | (!FD->isDependentContext() || |
17084 | (!isa<CXXConstructorDecl>(FD) && |
17085 | FD->getDeclName().getCXXOverloadedOperator() != OO_Equal))) { |
17086 | Diag(DefaultLoc, diag::err_default_special_members) |
17087 | << getLangOpts().CPlusPlus20; |
17088 | return; |
17089 | } |
17090 | |
17091 | if (DefKind.isComparison() && |
17092 | !isa<CXXRecordDecl>(FD->getLexicalDeclContext())) { |
17093 | Diag(FD->getLocation(), diag::err_defaulted_comparison_out_of_class) |
17094 | << (int)DefKind.asComparison(); |
17095 | return; |
17096 | } |
17097 | |
17098 | // Issue compatibility warning. We already warned if the operator is |
17099 | // 'operator<=>' when parsing the '<=>' token. |
17100 | if (DefKind.isComparison() && |
17101 | DefKind.asComparison() != DefaultedComparisonKind::ThreeWay) { |
17102 | Diag(DefaultLoc, getLangOpts().CPlusPlus20 |
17103 | ? diag::warn_cxx17_compat_defaulted_comparison |
17104 | : diag::ext_defaulted_comparison); |
17105 | } |
17106 | |
17107 | FD->setDefaulted(); |
17108 | FD->setExplicitlyDefaulted(); |
17109 | |
17110 | // Defer checking functions that are defaulted in a dependent context. |
17111 | if (FD->isDependentContext()) |
17112 | return; |
17113 | |
17114 | // Unset that we will have a body for this function. We might not, |
17115 | // if it turns out to be trivial, and we don't need this marking now |
17116 | // that we've marked it as defaulted. |
17117 | FD->setWillHaveBody(false); |
17118 | |
17119 | // If this definition appears within the record, do the checking when |
17120 | // the record is complete. This is always the case for a defaulted |
17121 | // comparison. |
17122 | if (DefKind.isComparison()) |
17123 | return; |
17124 | auto *MD = cast<CXXMethodDecl>(FD); |
17125 | |
17126 | const FunctionDecl *Primary = FD; |
17127 | if (const FunctionDecl *Pattern = FD->getTemplateInstantiationPattern()) |
17128 | // Ask the template instantiation pattern that actually had the |
17129 | // '= default' on it. |
17130 | Primary = Pattern; |
17131 | |
17132 | // If the method was defaulted on its first declaration, we will have |
17133 | // already performed the checking in CheckCompletedCXXClass. Such a |
17134 | // declaration doesn't trigger an implicit definition. |
17135 | if (Primary->getCanonicalDecl()->isDefaulted()) |
17136 | return; |
17137 | |
17138 | // FIXME: Once we support defining comparisons out of class, check for a |
17139 | // defaulted comparison here. |
17140 | if (CheckExplicitlyDefaultedSpecialMember(MD, DefKind.asSpecialMember())) |
17141 | MD->setInvalidDecl(); |
17142 | else |
17143 | DefineDefaultedFunction(*this, MD, DefaultLoc); |
17144 | } |
17145 | |
17146 | static void SearchForReturnInStmt(Sema &Self, Stmt *S) { |
17147 | for (Stmt *SubStmt : S->children()) { |
17148 | if (!SubStmt) |
17149 | continue; |
17150 | if (isa<ReturnStmt>(SubStmt)) |
17151 | Self.Diag(SubStmt->getBeginLoc(), |
17152 | diag::err_return_in_constructor_handler); |
17153 | if (!isa<Expr>(SubStmt)) |
17154 | SearchForReturnInStmt(Self, SubStmt); |
17155 | } |
17156 | } |
17157 | |
17158 | void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { |
17159 | for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { |
17160 | CXXCatchStmt *Handler = TryBlock->getHandler(I); |
17161 | SearchForReturnInStmt(*this, Handler); |
17162 | } |
17163 | } |
17164 | |
17165 | bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, |
17166 | const CXXMethodDecl *Old) { |
17167 | const auto *NewFT = New->getType()->castAs<FunctionProtoType>(); |
17168 | const auto *OldFT = Old->getType()->castAs<FunctionProtoType>(); |
17169 | |
17170 | if (OldFT->hasExtParameterInfos()) { |
17171 | for (unsigned I = 0, E = OldFT->getNumParams(); I != E; ++I) |
17172 | // A parameter of the overriding method should be annotated with noescape |
17173 | // if the corresponding parameter of the overridden method is annotated. |
17174 | if (OldFT->getExtParameterInfo(I).isNoEscape() && |
17175 | !NewFT->getExtParameterInfo(I).isNoEscape()) { |
17176 | Diag(New->getParamDecl(I)->getLocation(), |
17177 | diag::warn_overriding_method_missing_noescape); |
17178 | Diag(Old->getParamDecl(I)->getLocation(), |
17179 | diag::note_overridden_marked_noescape); |
17180 | } |
17181 | } |
17182 | |
17183 | // Virtual overrides must have the same code_seg. |
17184 | const auto *OldCSA = Old->getAttr<CodeSegAttr>(); |
17185 | const auto *NewCSA = New->getAttr<CodeSegAttr>(); |
17186 | if ((NewCSA || OldCSA) && |
17187 | (!OldCSA || !NewCSA || NewCSA->getName() != OldCSA->getName())) { |
17188 | Diag(New->getLocation(), diag::err_mismatched_code_seg_override); |
17189 | Diag(Old->getLocation(), diag::note_previous_declaration); |
17190 | return true; |
17191 | } |
17192 | |
17193 | CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv(); |
17194 | |
17195 | // If the calling conventions match, everything is fine |
17196 | if (NewCC == OldCC) |
17197 | return false; |
17198 | |
17199 | // If the calling conventions mismatch because the new function is static, |
17200 | // suppress the calling convention mismatch error; the error about static |
17201 | // function override (err_static_overrides_virtual from |
17202 | // Sema::CheckFunctionDeclaration) is more clear. |
17203 | if (New->getStorageClass() == SC_Static) |
17204 | return false; |
17205 | |
17206 | Diag(New->getLocation(), |
17207 | diag::err_conflicting_overriding_cc_attributes) |
17208 | << New->getDeclName() << New->getType() << Old->getType(); |
17209 | Diag(Old->getLocation(), diag::note_overridden_virtual_function); |
17210 | return true; |
17211 | } |
17212 | |
17213 | bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, |
17214 | const CXXMethodDecl *Old) { |
17215 | QualType NewTy = New->getType()->castAs<FunctionType>()->getReturnType(); |
17216 | QualType OldTy = Old->getType()->castAs<FunctionType>()->getReturnType(); |
17217 | |
17218 | if (Context.hasSameType(NewTy, OldTy) || |
17219 | NewTy->isDependentType() || OldTy->isDependentType()) |
17220 | return false; |
17221 | |
17222 | // Check if the return types are covariant |
17223 | QualType NewClassTy, OldClassTy; |
17224 | |
17225 | /// Both types must be pointers or references to classes. |
17226 | if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { |
17227 | if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { |
17228 | NewClassTy = NewPT->getPointeeType(); |
17229 | OldClassTy = OldPT->getPointeeType(); |
17230 | } |
17231 | } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { |
17232 | if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { |
17233 | if (NewRT->getTypeClass() == OldRT->getTypeClass()) { |
17234 | NewClassTy = NewRT->getPointeeType(); |
17235 | OldClassTy = OldRT->getPointeeType(); |
17236 | } |
17237 | } |
17238 | } |
17239 | |
17240 | // The return types aren't either both pointers or references to a class type. |
17241 | if (NewClassTy.isNull()) { |
17242 | Diag(New->getLocation(), |
17243 | diag::err_different_return_type_for_overriding_virtual_function) |
17244 | << New->getDeclName() << NewTy << OldTy |
17245 | << New->getReturnTypeSourceRange(); |
17246 | Diag(Old->getLocation(), diag::note_overridden_virtual_function) |
17247 | << Old->getReturnTypeSourceRange(); |
17248 | |
17249 | return true; |
17250 | } |
17251 | |
17252 | if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { |
17253 | // C++14 [class.virtual]p8: |
17254 | // If the class type in the covariant return type of D::f differs from |
17255 | // that of B::f, the class type in the return type of D::f shall be |
17256 | // complete at the point of declaration of D::f or shall be the class |
17257 | // type D. |
17258 | if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { |
17259 | if (!RT->isBeingDefined() && |
17260 | RequireCompleteType(New->getLocation(), NewClassTy, |
17261 | diag::err_covariant_return_incomplete, |
17262 | New->getDeclName())) |
17263 | return true; |
17264 | } |
17265 | |
17266 | // Check if the new class derives from the old class. |
17267 | if (!IsDerivedFrom(New->getLocation(), NewClassTy, OldClassTy)) { |
17268 | Diag(New->getLocation(), diag::err_covariant_return_not_derived) |
17269 | << New->getDeclName() << NewTy << OldTy |
17270 | << New->getReturnTypeSourceRange(); |
17271 | Diag(Old->getLocation(), diag::note_overridden_virtual_function) |
17272 | << Old->getReturnTypeSourceRange(); |
17273 | return true; |
17274 | } |
17275 | |
17276 | // Check if we the conversion from derived to base is valid. |
17277 | if (CheckDerivedToBaseConversion( |
17278 | NewClassTy, OldClassTy, |
17279 | diag::err_covariant_return_inaccessible_base, |
17280 | diag::err_covariant_return_ambiguous_derived_to_base_conv, |
17281 | New->getLocation(), New->getReturnTypeSourceRange(), |
17282 | New->getDeclName(), nullptr)) { |
17283 | // FIXME: this note won't trigger for delayed access control |
17284 | // diagnostics, and it's impossible to get an undelayed error |
17285 | // here from access control during the original parse because |
17286 | // the ParsingDeclSpec/ParsingDeclarator are still in scope. |
17287 | Diag(Old->getLocation(), diag::note_overridden_virtual_function) |
17288 | << Old->getReturnTypeSourceRange(); |
17289 | return true; |
17290 | } |
17291 | } |
17292 | |
17293 | // The qualifiers of the return types must be the same. |
17294 | if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { |
17295 | Diag(New->getLocation(), |
17296 | diag::err_covariant_return_type_different_qualifications) |
17297 | << New->getDeclName() << NewTy << OldTy |
17298 | << New->getReturnTypeSourceRange(); |
17299 | Diag(Old->getLocation(), diag::note_overridden_virtual_function) |
17300 | << Old->getReturnTypeSourceRange(); |
17301 | return true; |
17302 | } |
17303 | |
17304 | |
17305 | // The new class type must have the same or less qualifiers as the old type. |
17306 | if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { |
17307 | Diag(New->getLocation(), |
17308 | diag::err_covariant_return_type_class_type_more_qualified) |
17309 | << New->getDeclName() << NewTy << OldTy |
17310 | << New->getReturnTypeSourceRange(); |
17311 | Diag(Old->getLocation(), diag::note_overridden_virtual_function) |
17312 | << Old->getReturnTypeSourceRange(); |
17313 | return true; |
17314 | } |
17315 | |
17316 | return false; |
17317 | } |
17318 | |
17319 | /// Mark the given method pure. |
17320 | /// |
17321 | /// \param Method the method to be marked pure. |
17322 | /// |
17323 | /// \param InitRange the source range that covers the "0" initializer. |
17324 | bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { |
17325 | SourceLocation EndLoc = InitRange.getEnd(); |
17326 | if (EndLoc.isValid()) |
17327 | Method->setRangeEnd(EndLoc); |
17328 | |
17329 | if (Method->isVirtual() || Method->getParent()->isDependentContext()) { |
17330 | Method->setPure(); |
17331 | return false; |
17332 | } |
17333 | |
17334 | if (!Method->isInvalidDecl()) |
17335 | Diag(Method->getLocation(), diag::err_non_virtual_pure) |
17336 | << Method->getDeclName() << InitRange; |
17337 | return true; |
17338 | } |
17339 | |
17340 | void Sema::ActOnPureSpecifier(Decl *D, SourceLocation ZeroLoc) { |
17341 | if (D->getFriendObjectKind()) |
17342 | Diag(D->getLocation(), diag::err_pure_friend); |
17343 | else if (auto *M = dyn_cast<CXXMethodDecl>(D)) |
17344 | CheckPureMethod(M, ZeroLoc); |
17345 | else |
17346 | Diag(D->getLocation(), diag::err_illegal_initializer); |
17347 | } |
17348 | |
17349 | /// Determine whether the given declaration is a global variable or |
17350 | /// static data member. |
17351 | static bool isNonlocalVariable(const Decl *D) { |
17352 | if (const VarDecl *Var = dyn_cast_or_null<VarDecl>(D)) |
17353 | return Var->hasGlobalStorage(); |
17354 | |
17355 | return false; |
17356 | } |
17357 | |
17358 | /// Invoked when we are about to parse an initializer for the declaration |
17359 | /// 'Dcl'. |
17360 | /// |
17361 | /// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a |
17362 | /// static data member of class X, names should be looked up in the scope of |
17363 | /// class X. If the declaration had a scope specifier, a scope will have |
17364 | /// been created and passed in for this purpose. Otherwise, S will be null. |
17365 | void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { |
17366 | // If there is no declaration, there was an error parsing it. |
17367 | if (!D || D->isInvalidDecl()) |
17368 | return; |
17369 | |
17370 | // We will always have a nested name specifier here, but this declaration |
17371 | // might not be out of line if the specifier names the current namespace: |
17372 | // extern int n; |
17373 | // int ::n = 0; |
17374 | if (S && D->isOutOfLine()) |
17375 | EnterDeclaratorContext(S, D->getDeclContext()); |
17376 | |
17377 | // If we are parsing the initializer for a static data member, push a |
17378 | // new expression evaluation context that is associated with this static |
17379 | // data member. |
17380 | if (isNonlocalVariable(D)) |
17381 | PushExpressionEvaluationContext( |
17382 | ExpressionEvaluationContext::PotentiallyEvaluated, D); |
17383 | } |
17384 | |
17385 | /// Invoked after we are finished parsing an initializer for the declaration D. |
17386 | void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { |
17387 | // If there is no declaration, there was an error parsing it. |
17388 | if (!D || D->isInvalidDecl()) |
17389 | return; |
17390 | |
17391 | if (isNonlocalVariable(D)) |
17392 | PopExpressionEvaluationContext(); |
17393 | |
17394 | if (S && D->isOutOfLine()) |
17395 | ExitDeclaratorContext(S); |
17396 | } |
17397 | |
17398 | /// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a |
17399 | /// C++ if/switch/while/for statement. |
17400 | /// e.g: "if (int x = f()) {...}" |
17401 | DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { |
17402 | // C++ 6.4p2: |
17403 | // The declarator shall not specify a function or an array. |
17404 | // The type-specifier-seq shall not contain typedef and shall not declare a |
17405 | // new class or enumeration. |
17406 | assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef &&((void)0) |
17407 | "Parser allowed 'typedef' as storage class of condition decl.")((void)0); |
17408 | |
17409 | Decl *Dcl = ActOnDeclarator(S, D); |
17410 | if (!Dcl) |
17411 | return true; |
17412 | |
17413 | if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. |
17414 | Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) |
17415 | << D.getSourceRange(); |
17416 | return true; |
17417 | } |
17418 | |
17419 | return Dcl; |
17420 | } |
17421 | |
17422 | void Sema::LoadExternalVTableUses() { |
17423 | if (!ExternalSource) |
17424 | return; |
17425 | |
17426 | SmallVector<ExternalVTableUse, 4> VTables; |
17427 | ExternalSource->ReadUsedVTables(VTables); |
17428 | SmallVector<VTableUse, 4> NewUses; |
17429 | for (unsigned I = 0, N = VTables.size(); I != N; ++I) { |
17430 | llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos |
17431 | = VTablesUsed.find(VTables[I].Record); |
17432 | // Even if a definition wasn't required before, it may be required now. |
17433 | if (Pos != VTablesUsed.end()) { |
17434 | if (!Pos->second && VTables[I].DefinitionRequired) |
17435 | Pos->second = true; |
17436 | continue; |
17437 | } |
17438 | |
17439 | VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; |
17440 | NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); |
17441 | } |
17442 | |
17443 | VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); |
17444 | } |
17445 | |
17446 | void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, |
17447 | bool DefinitionRequired) { |
17448 | // Ignore any vtable uses in unevaluated operands or for classes that do |
17449 | // not have a vtable. |
17450 | if (!Class->isDynamicClass() || Class->isDependentContext() || |
17451 | CurContext->isDependentContext() || isUnevaluatedContext()) |
17452 | return; |
17453 | // Do not mark as used if compiling for the device outside of the target |
17454 | // region. |
17455 | if (TUKind != TU_Prefix && LangOpts.OpenMP && LangOpts.OpenMPIsDevice && |
17456 | !isInOpenMPDeclareTargetContext() && |
17457 | !isInOpenMPTargetExecutionDirective()) { |
17458 | if (!DefinitionRequired) |
17459 | MarkVirtualMembersReferenced(Loc, Class); |
17460 | return; |
17461 | } |
17462 | |
17463 | // Try to insert this class into the map. |
17464 | LoadExternalVTableUses(); |
17465 | Class = Class->getCanonicalDecl(); |
17466 | std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> |
17467 | Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); |
17468 | if (!Pos.second) { |
17469 | // If we already had an entry, check to see if we are promoting this vtable |
17470 | // to require a definition. If so, we need to reappend to the VTableUses |
17471 | // list, since we may have already processed the first entry. |
17472 | if (DefinitionRequired && !Pos.first->second) { |
17473 | Pos.first->second = true; |
17474 | } else { |
17475 | // Otherwise, we can early exit. |
17476 | return; |
17477 | } |
17478 | } else { |
17479 | // The Microsoft ABI requires that we perform the destructor body |
17480 | // checks (i.e. operator delete() lookup) when the vtable is marked used, as |
17481 | // the deleting destructor is emitted with the vtable, not with the |
17482 | // destructor definition as in the Itanium ABI. |
17483 | if (Context.getTargetInfo().getCXXABI().isMicrosoft()) { |
17484 | CXXDestructorDecl *DD = Class->getDestructor(); |
17485 | if (DD && DD->isVirtual() && !DD->isDeleted()) { |
17486 | if (Class->hasUserDeclaredDestructor() && !DD->isDefined()) { |
17487 | // If this is an out-of-line declaration, marking it referenced will |
17488 | // not do anything. Manually call CheckDestructor to look up operator |
17489 | // delete(). |
17490 | ContextRAII SavedContext(*this, DD); |
17491 | CheckDestructor(DD); |
17492 | } else { |
17493 | MarkFunctionReferenced(Loc, Class->getDestructor()); |
17494 | } |
17495 | } |
17496 | } |
17497 | } |
17498 | |
17499 | // Local classes need to have their virtual members marked |
17500 | // immediately. For all other classes, we mark their virtual members |
17501 | // at the end of the translation unit. |
17502 | if (Class->isLocalClass()) |
17503 | MarkVirtualMembersReferenced(Loc, Class); |
17504 | else |
17505 | VTableUses.push_back(std::make_pair(Class, Loc)); |
17506 | } |
17507 | |
17508 | bool Sema::DefineUsedVTables() { |
17509 | LoadExternalVTableUses(); |
17510 | if (VTableUses.empty()) |
17511 | return false; |
17512 | |
17513 | // Note: The VTableUses vector could grow as a result of marking |
17514 | // the members of a class as "used", so we check the size each |
17515 | // time through the loop and prefer indices (which are stable) to |
17516 | // iterators (which are not). |
17517 | bool DefinedAnything = false; |
17518 | for (unsigned I = 0; I != VTableUses.size(); ++I) { |
17519 | CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); |
17520 | if (!Class) |
17521 | continue; |
17522 | TemplateSpecializationKind ClassTSK = |
17523 | Class->getTemplateSpecializationKind(); |
17524 | |
17525 | SourceLocation Loc = VTableUses[I].second; |
17526 | |
17527 | bool DefineVTable = true; |
17528 | |
17529 | // If this class has a key function, but that key function is |
17530 | // defined in another translation unit, we don't need to emit the |
17531 | // vtable even though we're using it. |
17532 | const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(Class); |
17533 | if (KeyFunction && !KeyFunction->hasBody()) { |
17534 | // The key function is in another translation unit. |
17535 | DefineVTable = false; |
17536 | TemplateSpecializationKind TSK = |
17537 | KeyFunction->getTemplateSpecializationKind(); |
17538 | assert(TSK != TSK_ExplicitInstantiationDefinition &&((void)0) |
17539 | TSK != TSK_ImplicitInstantiation &&((void)0) |
17540 | "Instantiations don't have key functions")((void)0); |
17541 | (void)TSK; |
17542 | } else if (!KeyFunction) { |
17543 | // If we have a class with no key function that is the subject |
17544 | // of an explicit instantiation declaration, suppress the |
17545 | // vtable; it will live with the explicit instantiation |
17546 | // definition. |
17547 | bool IsExplicitInstantiationDeclaration = |
17548 | ClassTSK == TSK_ExplicitInstantiationDeclaration; |
17549 | for (auto R : Class->redecls()) { |
17550 | TemplateSpecializationKind TSK |
17551 | = cast<CXXRecordDecl>(R)->getTemplateSpecializationKind(); |
17552 | if (TSK == TSK_ExplicitInstantiationDeclaration) |
17553 | IsExplicitInstantiationDeclaration = true; |
17554 | else if (TSK == TSK_ExplicitInstantiationDefinition) { |
17555 | IsExplicitInstantiationDeclaration = false; |
17556 | break; |
17557 | } |
17558 | } |
17559 | |
17560 | if (IsExplicitInstantiationDeclaration) |
17561 | DefineVTable = false; |
17562 | } |
17563 | |
17564 | // The exception specifications for all virtual members may be needed even |
17565 | // if we are not providing an authoritative form of the vtable in this TU. |
17566 | // We may choose to emit it available_externally anyway. |
17567 | if (!DefineVTable) { |
17568 | MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); |
17569 | continue; |
17570 | } |
17571 | |
17572 | // Mark all of the virtual members of this class as referenced, so |
17573 | // that we can build a vtable. Then, tell the AST consumer that a |
17574 | // vtable for this class is required. |
17575 | DefinedAnything = true; |
17576 | MarkVirtualMembersReferenced(Loc, Class); |
17577 | CXXRecordDecl *Canonical = Class->getCanonicalDecl(); |
17578 | if (VTablesUsed[Canonical]) |
17579 | Consumer.HandleVTable(Class); |
17580 | |
17581 | // Warn if we're emitting a weak vtable. The vtable will be weak if there is |
17582 | // no key function or the key function is inlined. Don't warn in C++ ABIs |
17583 | // that lack key functions, since the user won't be able to make one. |
17584 | if (Context.getTargetInfo().getCXXABI().hasKeyFunctions() && |
17585 | Class->isExternallyVisible() && ClassTSK != TSK_ImplicitInstantiation) { |
17586 | const FunctionDecl *KeyFunctionDef = nullptr; |
17587 | if (!KeyFunction || (KeyFunction->hasBody(KeyFunctionDef) && |
17588 | KeyFunctionDef->isInlined())) { |
17589 | Diag(Class->getLocation(), |
17590 | ClassTSK == TSK_ExplicitInstantiationDefinition |
17591 | ? diag::warn_weak_template_vtable |
17592 | : diag::warn_weak_vtable) |
17593 | << Class; |
17594 | } |
17595 | } |
17596 | } |
17597 | VTableUses.clear(); |
17598 | |
17599 | return DefinedAnything; |
17600 | } |
17601 | |
17602 | void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, |
17603 | const CXXRecordDecl *RD) { |
17604 | for (const auto *I : RD->methods()) |
17605 | if (I->isVirtual() && !I->isPure()) |
17606 | ResolveExceptionSpec(Loc, I->getType()->castAs<FunctionProtoType>()); |
17607 | } |
17608 | |
17609 | void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, |
17610 | const CXXRecordDecl *RD, |
17611 | bool ConstexprOnly) { |
17612 | // Mark all functions which will appear in RD's vtable as used. |
17613 | CXXFinalOverriderMap FinalOverriders; |
17614 | RD->getFinalOverriders(FinalOverriders); |
17615 | for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), |
17616 | E = FinalOverriders.end(); |
17617 | I != E; ++I) { |
17618 | for (OverridingMethods::const_iterator OI = I->second.begin(), |
17619 | OE = I->second.end(); |
17620 | OI != OE; ++OI) { |
17621 | assert(OI->second.size() > 0 && "no final overrider")((void)0); |
17622 | CXXMethodDecl *Overrider = OI->second.front().Method; |
17623 | |
17624 | // C++ [basic.def.odr]p2: |
17625 | // [...] A virtual member function is used if it is not pure. [...] |
17626 | if (!Overrider->isPure() && (!ConstexprOnly || Overrider->isConstexpr())) |
17627 | MarkFunctionReferenced(Loc, Overrider); |
17628 | } |
17629 | } |
17630 | |
17631 | // Only classes that have virtual bases need a VTT. |
17632 | if (RD->getNumVBases() == 0) |
17633 | return; |
17634 | |
17635 | for (const auto &I : RD->bases()) { |
17636 | const auto *Base = |
17637 | cast<CXXRecordDecl>(I.getType()->castAs<RecordType>()->getDecl()); |
17638 | if (Base->getNumVBases() == 0) |
17639 | continue; |
17640 | MarkVirtualMembersReferenced(Loc, Base); |
17641 | } |
17642 | } |
17643 | |
17644 | /// SetIvarInitializers - This routine builds initialization ASTs for the |
17645 | /// Objective-C implementation whose ivars need be initialized. |
17646 | void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { |
17647 | if (!getLangOpts().CPlusPlus) |
17648 | return; |
17649 | if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { |
17650 | SmallVector<ObjCIvarDecl*, 8> ivars; |
17651 | CollectIvarsToConstructOrDestruct(OID, ivars); |
17652 | if (ivars.empty()) |
17653 | return; |
17654 | SmallVector<CXXCtorInitializer*, 32> AllToInit; |
17655 | for (unsigned i = 0; i < ivars.size(); i++) { |
17656 | FieldDecl *Field = ivars[i]; |
17657 | if (Field->isInvalidDecl()) |
17658 | continue; |
17659 | |
17660 | CXXCtorInitializer *Member; |
17661 | InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); |
17662 | InitializationKind InitKind = |
17663 | InitializationKind::CreateDefault(ObjCImplementation->getLocation()); |
17664 | |
17665 | InitializationSequence InitSeq(*this, InitEntity, InitKind, None); |
17666 | ExprResult MemberInit = |
17667 | InitSeq.Perform(*this, InitEntity, InitKind, None); |
17668 | MemberInit = MaybeCreateExprWithCleanups(MemberInit); |
17669 | // Note, MemberInit could actually come back empty if no initialization |
17670 | // is required (e.g., because it would call a trivial default constructor) |
17671 | if (!MemberInit.get() || MemberInit.isInvalid()) |
17672 | continue; |
17673 | |
17674 | Member = |
17675 | new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), |
17676 | SourceLocation(), |
17677 | MemberInit.getAs<Expr>(), |
17678 | SourceLocation()); |
17679 | AllToInit.push_back(Member); |
17680 | |
17681 | // Be sure that the destructor is accessible and is marked as referenced. |
17682 | if (const RecordType *RecordTy = |
17683 | Context.getBaseElementType(Field->getType()) |
17684 | ->getAs<RecordType>()) { |
17685 | CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); |
17686 | if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { |
17687 | MarkFunctionReferenced(Field->getLocation(), Destructor); |
17688 | CheckDestructorAccess(Field->getLocation(), Destructor, |
17689 | PDiag(diag::err_access_dtor_ivar) |
17690 | << Context.getBaseElementType(Field->getType())); |
17691 | } |
17692 | } |
17693 | } |
17694 | ObjCImplementation->setIvarInitializers(Context, |
17695 | AllToInit.data(), AllToInit.size()); |
17696 | } |
17697 | } |
17698 | |
17699 | static |
17700 | void DelegatingCycleHelper(CXXConstructorDecl* Ctor, |
17701 | llvm::SmallPtrSet<CXXConstructorDecl*, 4> &Valid, |
17702 | llvm::SmallPtrSet<CXXConstructorDecl*, 4> &Invalid, |
17703 | llvm::SmallPtrSet<CXXConstructorDecl*, 4> &Current, |
17704 | Sema &S) { |
17705 | if (Ctor->isInvalidDecl()) |
17706 | return; |
17707 | |
17708 | CXXConstructorDecl *Target = Ctor->getTargetConstructor(); |
17709 | |
17710 | // Target may not be determinable yet, for instance if this is a dependent |
17711 | // call in an uninstantiated template. |
17712 | if (Target) { |
17713 | const FunctionDecl *FNTarget = nullptr; |
17714 | (void)Target->hasBody(FNTarget); |
17715 | Target = const_cast<CXXConstructorDecl*>( |
17716 | cast_or_null<CXXConstructorDecl>(FNTarget)); |
17717 | } |
17718 | |
17719 | CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), |
17720 | // Avoid dereferencing a null pointer here. |
17721 | *TCanonical = Target? Target->getCanonicalDecl() : nullptr; |
17722 | |
17723 | if (!Current.insert(Canonical).second) |
17724 | return; |
17725 | |
17726 | // We know that beyond here, we aren't chaining into a cycle. |
17727 | if (!Target || !Target->isDelegatingConstructor() || |
17728 | Target->isInvalidDecl() || Valid.count(TCanonical)) { |
17729 | Valid.insert(Current.begin(), Current.end()); |
17730 | Current.clear(); |
17731 | // We've hit a cycle. |
17732 | } else if (TCanonical == Canonical || Invalid.count(TCanonical) || |
17733 | Current.count(TCanonical)) { |
17734 | // If we haven't diagnosed this cycle yet, do so now. |
17735 | if (!Invalid.count(TCanonical)) { |
17736 | S.Diag((*Ctor->init_begin())->getSourceLocation(), |
17737 | diag::warn_delegating_ctor_cycle) |
17738 | << Ctor; |
17739 | |
17740 | // Don't add a note for a function delegating directly to itself. |
17741 | if (TCanonical != Canonical) |
17742 | S.Diag(Target->getLocation(), diag::note_it_delegates_to); |
17743 | |
17744 | CXXConstructorDecl *C = Target; |
17745 | while (C->getCanonicalDecl() != Canonical) { |
17746 | const FunctionDecl *FNTarget = nullptr; |
17747 | (void)C->getTargetConstructor()->hasBody(FNTarget); |
17748 | assert(FNTarget && "Ctor cycle through bodiless function")((void)0); |
17749 | |
17750 | C = const_cast<CXXConstructorDecl*>( |
17751 | cast<CXXConstructorDecl>(FNTarget)); |
17752 | S.Diag(C->getLocation(), diag::note_which_delegates_to); |
17753 | } |
17754 | } |
17755 | |
17756 | Invalid.insert(Current.begin(), Current.end()); |
17757 | Current.clear(); |
17758 | } else { |
17759 | DelegatingCycleHelper(Target, Valid, Invalid, Current, S); |
17760 | } |
17761 | } |
17762 | |
17763 | |
17764 | void Sema::CheckDelegatingCtorCycles() { |
17765 | llvm::SmallPtrSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; |
17766 | |
17767 | for (DelegatingCtorDeclsType::iterator |
17768 | I = DelegatingCtorDecls.begin(ExternalSource), |
17769 | E = DelegatingCtorDecls.end(); |
17770 | I != E; ++I) |
17771 | DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); |
17772 | |
17773 | for (auto CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) |
17774 | (*CI)->setInvalidDecl(); |
17775 | } |
17776 | |
17777 | namespace { |
17778 | /// AST visitor that finds references to the 'this' expression. |
17779 | class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { |
17780 | Sema &S; |
17781 | |
17782 | public: |
17783 | explicit FindCXXThisExpr(Sema &S) : S(S) { } |
17784 | |
17785 | bool VisitCXXThisExpr(CXXThisExpr *E) { |
17786 | S.Diag(E->getLocation(), diag::err_this_static_member_func) |
17787 | << E->isImplicit(); |
17788 | return false; |
17789 | } |
17790 | }; |
17791 | } |
17792 | |
17793 | bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { |
17794 | TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); |
17795 | if (!TSInfo) |
17796 | return false; |
17797 | |
17798 | TypeLoc TL = TSInfo->getTypeLoc(); |
17799 | FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); |
17800 | if (!ProtoTL) |
17801 | return false; |
17802 | |
17803 | // C++11 [expr.prim.general]p3: |
17804 | // [The expression this] shall not appear before the optional |
17805 | // cv-qualifier-seq and it shall not appear within the declaration of a |
17806 | // static member function (although its type and value category are defined |
17807 | // within a static member function as they are within a non-static member |
17808 | // function). [ Note: this is because declaration matching does not occur |
17809 | // until the complete declarator is known. - end note ] |
17810 | const FunctionProtoType *Proto = ProtoTL.getTypePtr(); |
17811 | FindCXXThisExpr Finder(*this); |
17812 | |
17813 | // If the return type came after the cv-qualifier-seq, check it now. |
17814 | if (Proto->hasTrailingReturn() && |
17815 | !Finder.TraverseTypeLoc(ProtoTL.getReturnLoc())) |
17816 | return true; |
17817 | |
17818 | // Check the exception specification. |
17819 | if (checkThisInStaticMemberFunctionExceptionSpec(Method)) |
17820 | return true; |
17821 | |
17822 | // Check the trailing requires clause |
17823 | if (Expr *E = Method->getTrailingRequiresClause()) |
17824 | if (!Finder.TraverseStmt(E)) |
17825 | return true; |
17826 | |
17827 | return checkThisInStaticMemberFunctionAttributes(Method); |
17828 | } |
17829 | |
17830 | bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { |
17831 | TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); |
17832 | if (!TSInfo) |
17833 | return false; |
17834 | |
17835 | TypeLoc TL = TSInfo->getTypeLoc(); |
17836 | FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); |
17837 | if (!ProtoTL) |
17838 | return false; |
17839 | |
17840 | const FunctionProtoType *Proto = ProtoTL.getTypePtr(); |
17841 | FindCXXThisExpr Finder(*this); |
17842 | |
17843 | switch (Proto->getExceptionSpecType()) { |
17844 | case EST_Unparsed: |
17845 | case EST_Uninstantiated: |
17846 | case EST_Unevaluated: |
17847 | case EST_BasicNoexcept: |
17848 | case EST_NoThrow: |
17849 | case EST_DynamicNone: |
17850 | case EST_MSAny: |
17851 | case EST_None: |
17852 | break; |
17853 | |
17854 | case EST_DependentNoexcept: |
17855 | case EST_NoexceptFalse: |
17856 | case EST_NoexceptTrue: |
17857 | if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) |
17858 | return true; |
17859 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; |
17860 | |
17861 | case EST_Dynamic: |
17862 | for (const auto &E : Proto->exceptions()) { |
17863 | if (!Finder.TraverseType(E)) |
17864 | return true; |
17865 | } |
17866 | break; |
17867 | } |
17868 | |
17869 | return false; |
17870 | } |
17871 | |
17872 | bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { |
17873 | FindCXXThisExpr Finder(*this); |
17874 | |
17875 | // Check attributes. |
17876 | for (const auto *A : Method->attrs()) { |
17877 | // FIXME: This should be emitted by tblgen. |
17878 | Expr *Arg = nullptr; |
17879 | ArrayRef<Expr *> Args; |
17880 | if (const auto *G = dyn_cast<GuardedByAttr>(A)) |
17881 | Arg = G->getArg(); |
17882 | else if (const auto *G = dyn_cast<PtGuardedByAttr>(A)) |
17883 | Arg = G->getArg(); |
17884 | else if (const auto *AA = dyn_cast<AcquiredAfterAttr>(A)) |
17885 | Args = llvm::makeArrayRef(AA->args_begin(), AA->args_size()); |
17886 | else if (const auto *AB = dyn_cast<AcquiredBeforeAttr>(A)) |
17887 | Args = llvm::makeArrayRef(AB->args_begin(), AB->args_size()); |
17888 | else if (const auto *ETLF = dyn_cast<ExclusiveTrylockFunctionAttr>(A)) { |
17889 | Arg = ETLF->getSuccessValue(); |
17890 | Args = llvm::makeArrayRef(ETLF->args_begin(), ETLF->args_size()); |
17891 | } else if (const auto *STLF = dyn_cast<SharedTrylockFunctionAttr>(A)) { |
17892 | Arg = STLF->getSuccessValue(); |
17893 | Args = llvm::makeArrayRef(STLF->args_begin(), STLF->args_size()); |
17894 | } else if (const auto *LR = dyn_cast<LockReturnedAttr>(A)) |
17895 | Arg = LR->getArg(); |
17896 | else if (const auto *LE = dyn_cast<LocksExcludedAttr>(A)) |
17897 | Args = llvm::makeArrayRef(LE->args_begin(), LE->args_size()); |
17898 | else if (const auto *RC = dyn_cast<RequiresCapabilityAttr>(A)) |
17899 | Args = llvm::makeArrayRef(RC->args_begin(), RC->args_size()); |
17900 | else if (const auto *AC = dyn_cast<AcquireCapabilityAttr>(A)) |
17901 | Args = llvm::makeArrayRef(AC->args_begin(), AC->args_size()); |
17902 | else if (const auto *AC = dyn_cast<TryAcquireCapabilityAttr>(A)) |
17903 | Args = llvm::makeArrayRef(AC->args_begin(), AC->args_size()); |
17904 | else if (const auto *RC = dyn_cast<ReleaseCapabilityAttr>(A)) |
17905 | Args = llvm::makeArrayRef(RC->args_begin(), RC->args_size()); |
17906 | |
17907 | if (Arg && !Finder.TraverseStmt(Arg)) |
17908 | return true; |
17909 | |
17910 | for (unsigned I = 0, N = Args.size(); I != N; ++I) { |
17911 | if (!Finder.TraverseStmt(Args[I])) |
17912 | return true; |
17913 | } |
17914 | } |
17915 | |
17916 | return false; |
17917 | } |
17918 | |
17919 | void Sema::checkExceptionSpecification( |
17920 | bool IsTopLevel, ExceptionSpecificationType EST, |
17921 | ArrayRef<ParsedType> DynamicExceptions, |
17922 | ArrayRef<SourceRange> DynamicExceptionRanges, Expr *NoexceptExpr, |
17923 | SmallVectorImpl<QualType> &Exceptions, |
17924 | FunctionProtoType::ExceptionSpecInfo &ESI) { |
17925 | Exceptions.clear(); |
17926 | ESI.Type = EST; |
17927 | if (EST == EST_Dynamic) { |
17928 | Exceptions.reserve(DynamicExceptions.size()); |
17929 | for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { |
17930 | // FIXME: Preserve type source info. |
17931 | QualType ET = GetTypeFromParser(DynamicExceptions[ei]); |
17932 | |
17933 | if (IsTopLevel) { |
17934 | SmallVector<UnexpandedParameterPack, 2> Unexpanded; |
17935 | collectUnexpandedParameterPacks(ET, Unexpanded); |
17936 | if (!Unexpanded.empty()) { |
17937 | DiagnoseUnexpandedParameterPacks( |
17938 | DynamicExceptionRanges[ei].getBegin(), UPPC_ExceptionType, |
17939 | Unexpanded); |
17940 | continue; |
17941 | } |
17942 | } |
17943 | |
17944 | // Check that the type is valid for an exception spec, and |
17945 | // drop it if not. |
17946 | if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) |
17947 | Exceptions.push_back(ET); |
17948 | } |
17949 | ESI.Exceptions = Exceptions; |
17950 | return; |
17951 | } |
17952 | |
17953 | if (isComputedNoexcept(EST)) { |
17954 | assert((NoexceptExpr->isTypeDependent() ||((void)0) |
17955 | NoexceptExpr->getType()->getCanonicalTypeUnqualified() ==((void)0) |
17956 | Context.BoolTy) &&((void)0) |
17957 | "Parser should have made sure that the expression is boolean")((void)0); |
17958 | if (IsTopLevel && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { |
17959 | ESI.Type = EST_BasicNoexcept; |
17960 | return; |
17961 | } |
17962 | |
17963 | ESI.NoexceptExpr = NoexceptExpr; |
17964 | return; |
17965 | } |
17966 | } |
17967 | |
17968 | void Sema::actOnDelayedExceptionSpecification(Decl *MethodD, |
17969 | ExceptionSpecificationType EST, |
17970 | SourceRange SpecificationRange, |
17971 | ArrayRef<ParsedType> DynamicExceptions, |
17972 | ArrayRef<SourceRange> DynamicExceptionRanges, |
17973 | Expr *NoexceptExpr) { |
17974 | if (!MethodD) |
17975 | return; |
17976 | |
17977 | // Dig out the method we're referring to. |
17978 | if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(MethodD)) |
17979 | MethodD = FunTmpl->getTemplatedDecl(); |
17980 | |
17981 | CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(MethodD); |
17982 | if (!Method) |
17983 | return; |
17984 | |
17985 | // Check the exception specification. |
17986 | llvm::SmallVector<QualType, 4> Exceptions; |
17987 | FunctionProtoType::ExceptionSpecInfo ESI; |
17988 | checkExceptionSpecification(/*IsTopLevel*/true, EST, DynamicExceptions, |
17989 | DynamicExceptionRanges, NoexceptExpr, Exceptions, |
17990 | ESI); |
17991 | |
17992 | // Update the exception specification on the function type. |
17993 | Context.adjustExceptionSpec(Method, ESI, /*AsWritten*/true); |
17994 | |
17995 | if (Method->isStatic()) |
17996 | checkThisInStaticMemberFunctionExceptionSpec(Method); |
17997 | |
17998 | if (Method->isVirtual()) { |
17999 | // Check overrides, which we previously had to delay. |
18000 | for (const CXXMethodDecl *O : Method->overridden_methods()) |
18001 | CheckOverridingFunctionExceptionSpec(Method, O); |
18002 | } |
18003 | } |
18004 | |
18005 | /// HandleMSProperty - Analyze a __delcspec(property) field of a C++ class. |
18006 | /// |
18007 | MSPropertyDecl *Sema::HandleMSProperty(Scope *S, RecordDecl *Record, |
18008 | SourceLocation DeclStart, Declarator &D, |
18009 | Expr *BitWidth, |
18010 | InClassInitStyle InitStyle, |
18011 | AccessSpecifier AS, |
18012 | const ParsedAttr &MSPropertyAttr) { |
18013 | IdentifierInfo *II = D.getIdentifier(); |
18014 | if (!II) { |
18015 | Diag(DeclStart, diag::err_anonymous_property); |
18016 | return nullptr; |
18017 | } |
18018 | SourceLocation Loc = D.getIdentifierLoc(); |
18019 | |
18020 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); |
18021 | QualType T = TInfo->getType(); |
18022 | if (getLangOpts().CPlusPlus) { |
18023 | CheckExtraCXXDefaultArguments(D); |
18024 | |
18025 | if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, |
18026 | UPPC_DataMemberType)) { |
18027 | D.setInvalidType(); |
18028 | T = Context.IntTy; |
18029 | TInfo = Context.getTrivialTypeSourceInfo(T, Loc); |
18030 | } |
18031 | } |
18032 | |
18033 | DiagnoseFunctionSpecifiers(D.getDeclSpec()); |
18034 | |
18035 | if (D.getDeclSpec().isInlineSpecified()) |
18036 | Diag(D.getDeclSpec().getInlineSpecLoc(), diag::err_inline_non_function) |
18037 | << getLangOpts().CPlusPlus17; |
18038 | if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec()) |
18039 | Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(), |
18040 | diag::err_invalid_thread) |
18041 | << DeclSpec::getSpecifierName(TSCS); |
18042 | |
18043 | // Check to see if this name was declared as a member previously |
18044 | NamedDecl *PrevDecl = nullptr; |
18045 | LookupResult Previous(*this, II, Loc, LookupMemberName, |
18046 | ForVisibleRedeclaration); |
18047 | LookupName(Previous, S); |
18048 | switch (Previous.getResultKind()) { |
18049 | case LookupResult::Found: |
18050 | case LookupResult::FoundUnresolvedValue: |
18051 | PrevDecl = Previous.getAsSingle<NamedDecl>(); |
18052 | break; |
18053 | |
18054 | case LookupResult::FoundOverloaded: |
18055 | PrevDecl = Previous.getRepresentativeDecl(); |
18056 | break; |
18057 | |
18058 | case LookupResult::NotFound: |
18059 | case LookupResult::NotFoundInCurrentInstantiation: |
18060 | case LookupResult::Ambiguous: |
18061 | break; |
18062 | } |
18063 | |
18064 | if (PrevDecl && PrevDecl->isTemplateParameter()) { |
18065 | // Maybe we will complain about the shadowed template parameter. |
18066 | DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); |
18067 | // Just pretend that we didn't see the previous declaration. |
18068 | PrevDecl = nullptr; |
18069 | } |
18070 | |
18071 | if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) |
18072 | PrevDecl = nullptr; |
18073 | |
18074 | SourceLocation TSSL = D.getBeginLoc(); |
18075 | MSPropertyDecl *NewPD = |
18076 | MSPropertyDecl::Create(Context, Record, Loc, II, T, TInfo, TSSL, |
18077 | MSPropertyAttr.getPropertyDataGetter(), |
18078 | MSPropertyAttr.getPropertyDataSetter()); |
18079 | ProcessDeclAttributes(TUScope, NewPD, D); |
18080 | NewPD->setAccess(AS); |
18081 | |
18082 | if (NewPD->isInvalidDecl()) |
18083 | Record->setInvalidDecl(); |
18084 | |
18085 | if (D.getDeclSpec().isModulePrivateSpecified()) |
18086 | NewPD->setModulePrivate(); |
18087 | |
18088 | if (NewPD->isInvalidDecl() && PrevDecl) { |
18089 | // Don't introduce NewFD into scope; there's already something |
18090 | // with the same name in the same scope. |
18091 | } else if (II) { |
18092 | PushOnScopeChains(NewPD, S); |
18093 | } else |
18094 | Record->addDecl(NewPD); |
18095 | |
18096 | return NewPD; |
18097 | } |
18098 | |
18099 | void Sema::ActOnStartFunctionDeclarationDeclarator( |
18100 | Declarator &Declarator, unsigned TemplateParameterDepth) { |
18101 | auto &Info = InventedParameterInfos.emplace_back(); |
18102 | TemplateParameterList *ExplicitParams = nullptr; |
18103 | ArrayRef<TemplateParameterList *> ExplicitLists = |
18104 | Declarator.getTemplateParameterLists(); |
18105 | if (!ExplicitLists.empty()) { |
18106 | bool IsMemberSpecialization, IsInvalid; |
18107 | ExplicitParams = MatchTemplateParametersToScopeSpecifier( |
18108 | Declarator.getBeginLoc(), Declarator.getIdentifierLoc(), |
18109 | Declarator.getCXXScopeSpec(), /*TemplateId=*/nullptr, |
18110 | ExplicitLists, /*IsFriend=*/false, IsMemberSpecialization, IsInvalid, |
18111 | /*SuppressDiagnostic=*/true); |
18112 | } |
18113 | if (ExplicitParams) { |
18114 | Info.AutoTemplateParameterDepth = ExplicitParams->getDepth(); |
18115 | for (NamedDecl *Param : *ExplicitParams) |
18116 | Info.TemplateParams.push_back(Param); |
18117 | Info.NumExplicitTemplateParams = ExplicitParams->size(); |
18118 | } else { |
18119 | Info.AutoTemplateParameterDepth = TemplateParameterDepth; |
18120 | Info.NumExplicitTemplateParams = 0; |
18121 | } |
18122 | } |
18123 | |
18124 | void Sema::ActOnFinishFunctionDeclarationDeclarator(Declarator &Declarator) { |
18125 | auto &FSI = InventedParameterInfos.back(); |
18126 | if (FSI.TemplateParams.size() > FSI.NumExplicitTemplateParams) { |
18127 | if (FSI.NumExplicitTemplateParams != 0) { |
18128 | TemplateParameterList *ExplicitParams = |
18129 | Declarator.getTemplateParameterLists().back(); |
18130 | Declarator.setInventedTemplateParameterList( |
18131 | TemplateParameterList::Create( |
18132 | Context, ExplicitParams->getTemplateLoc(), |
18133 | ExplicitParams->getLAngleLoc(), FSI.TemplateParams, |
18134 | ExplicitParams->getRAngleLoc(), |
18135 | ExplicitParams->getRequiresClause())); |
18136 | } else { |
18137 | Declarator.setInventedTemplateParameterList( |
18138 | TemplateParameterList::Create( |
18139 | Context, SourceLocation(), SourceLocation(), FSI.TemplateParams, |
18140 | SourceLocation(), /*RequiresClause=*/nullptr)); |
18141 | } |
18142 | } |
18143 | InventedParameterInfos.pop_back(); |
18144 | } |