File: | src/gnu/usr.bin/clang/libclangSema/../../../llvm/clang/lib/Sema/SemaTemplate.cpp |
Warning: | line 1395, column 5 Value stored to 'RD' is never read |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
1 | //===------- SemaTemplate.cpp - Semantic Analysis for C++ Templates -------===// |
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 | // This file implements semantic analysis for C++ templates. |
9 | //===----------------------------------------------------------------------===// |
10 | |
11 | #include "TreeTransform.h" |
12 | #include "clang/AST/ASTConsumer.h" |
13 | #include "clang/AST/ASTContext.h" |
14 | #include "clang/AST/DeclFriend.h" |
15 | #include "clang/AST/DeclTemplate.h" |
16 | #include "clang/AST/Expr.h" |
17 | #include "clang/AST/ExprCXX.h" |
18 | #include "clang/AST/RecursiveASTVisitor.h" |
19 | #include "clang/AST/TypeVisitor.h" |
20 | #include "clang/Basic/Builtins.h" |
21 | #include "clang/Basic/LangOptions.h" |
22 | #include "clang/Basic/PartialDiagnostic.h" |
23 | #include "clang/Basic/Stack.h" |
24 | #include "clang/Basic/TargetInfo.h" |
25 | #include "clang/Sema/DeclSpec.h" |
26 | #include "clang/Sema/Initialization.h" |
27 | #include "clang/Sema/Lookup.h" |
28 | #include "clang/Sema/Overload.h" |
29 | #include "clang/Sema/ParsedTemplate.h" |
30 | #include "clang/Sema/Scope.h" |
31 | #include "clang/Sema/SemaInternal.h" |
32 | #include "clang/Sema/Template.h" |
33 | #include "clang/Sema/TemplateDeduction.h" |
34 | #include "llvm/ADT/SmallBitVector.h" |
35 | #include "llvm/ADT/SmallString.h" |
36 | #include "llvm/ADT/StringExtras.h" |
37 | |
38 | #include <iterator> |
39 | using namespace clang; |
40 | using namespace sema; |
41 | |
42 | // Exported for use by Parser. |
43 | SourceRange |
44 | clang::getTemplateParamsRange(TemplateParameterList const * const *Ps, |
45 | unsigned N) { |
46 | if (!N) return SourceRange(); |
47 | return SourceRange(Ps[0]->getTemplateLoc(), Ps[N-1]->getRAngleLoc()); |
48 | } |
49 | |
50 | unsigned Sema::getTemplateDepth(Scope *S) const { |
51 | unsigned Depth = 0; |
52 | |
53 | // Each template parameter scope represents one level of template parameter |
54 | // depth. |
55 | for (Scope *TempParamScope = S->getTemplateParamParent(); TempParamScope; |
56 | TempParamScope = TempParamScope->getParent()->getTemplateParamParent()) { |
57 | ++Depth; |
58 | } |
59 | |
60 | // Note that there are template parameters with the given depth. |
61 | auto ParamsAtDepth = [&](unsigned D) { Depth = std::max(Depth, D + 1); }; |
62 | |
63 | // Look for parameters of an enclosing generic lambda. We don't create a |
64 | // template parameter scope for these. |
65 | for (FunctionScopeInfo *FSI : getFunctionScopes()) { |
66 | if (auto *LSI = dyn_cast<LambdaScopeInfo>(FSI)) { |
67 | if (!LSI->TemplateParams.empty()) { |
68 | ParamsAtDepth(LSI->AutoTemplateParameterDepth); |
69 | break; |
70 | } |
71 | if (LSI->GLTemplateParameterList) { |
72 | ParamsAtDepth(LSI->GLTemplateParameterList->getDepth()); |
73 | break; |
74 | } |
75 | } |
76 | } |
77 | |
78 | // Look for parameters of an enclosing terse function template. We don't |
79 | // create a template parameter scope for these either. |
80 | for (const InventedTemplateParameterInfo &Info : |
81 | getInventedParameterInfos()) { |
82 | if (!Info.TemplateParams.empty()) { |
83 | ParamsAtDepth(Info.AutoTemplateParameterDepth); |
84 | break; |
85 | } |
86 | } |
87 | |
88 | return Depth; |
89 | } |
90 | |
91 | /// \brief Determine whether the declaration found is acceptable as the name |
92 | /// of a template and, if so, return that template declaration. Otherwise, |
93 | /// returns null. |
94 | /// |
95 | /// Note that this may return an UnresolvedUsingValueDecl if AllowDependent |
96 | /// is true. In all other cases it will return a TemplateDecl (or null). |
97 | NamedDecl *Sema::getAsTemplateNameDecl(NamedDecl *D, |
98 | bool AllowFunctionTemplates, |
99 | bool AllowDependent) { |
100 | D = D->getUnderlyingDecl(); |
101 | |
102 | if (isa<TemplateDecl>(D)) { |
103 | if (!AllowFunctionTemplates && isa<FunctionTemplateDecl>(D)) |
104 | return nullptr; |
105 | |
106 | return D; |
107 | } |
108 | |
109 | if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) { |
110 | // C++ [temp.local]p1: |
111 | // Like normal (non-template) classes, class templates have an |
112 | // injected-class-name (Clause 9). The injected-class-name |
113 | // can be used with or without a template-argument-list. When |
114 | // it is used without a template-argument-list, it is |
115 | // equivalent to the injected-class-name followed by the |
116 | // template-parameters of the class template enclosed in |
117 | // <>. When it is used with a template-argument-list, it |
118 | // refers to the specified class template specialization, |
119 | // which could be the current specialization or another |
120 | // specialization. |
121 | if (Record->isInjectedClassName()) { |
122 | Record = cast<CXXRecordDecl>(Record->getDeclContext()); |
123 | if (Record->getDescribedClassTemplate()) |
124 | return Record->getDescribedClassTemplate(); |
125 | |
126 | if (ClassTemplateSpecializationDecl *Spec |
127 | = dyn_cast<ClassTemplateSpecializationDecl>(Record)) |
128 | return Spec->getSpecializedTemplate(); |
129 | } |
130 | |
131 | return nullptr; |
132 | } |
133 | |
134 | // 'using Dependent::foo;' can resolve to a template name. |
135 | // 'using typename Dependent::foo;' cannot (not even if 'foo' is an |
136 | // injected-class-name). |
137 | if (AllowDependent && isa<UnresolvedUsingValueDecl>(D)) |
138 | return D; |
139 | |
140 | return nullptr; |
141 | } |
142 | |
143 | void Sema::FilterAcceptableTemplateNames(LookupResult &R, |
144 | bool AllowFunctionTemplates, |
145 | bool AllowDependent) { |
146 | LookupResult::Filter filter = R.makeFilter(); |
147 | while (filter.hasNext()) { |
148 | NamedDecl *Orig = filter.next(); |
149 | if (!getAsTemplateNameDecl(Orig, AllowFunctionTemplates, AllowDependent)) |
150 | filter.erase(); |
151 | } |
152 | filter.done(); |
153 | } |
154 | |
155 | bool Sema::hasAnyAcceptableTemplateNames(LookupResult &R, |
156 | bool AllowFunctionTemplates, |
157 | bool AllowDependent, |
158 | bool AllowNonTemplateFunctions) { |
159 | for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { |
160 | if (getAsTemplateNameDecl(*I, AllowFunctionTemplates, AllowDependent)) |
161 | return true; |
162 | if (AllowNonTemplateFunctions && |
163 | isa<FunctionDecl>((*I)->getUnderlyingDecl())) |
164 | return true; |
165 | } |
166 | |
167 | return false; |
168 | } |
169 | |
170 | TemplateNameKind Sema::isTemplateName(Scope *S, |
171 | CXXScopeSpec &SS, |
172 | bool hasTemplateKeyword, |
173 | const UnqualifiedId &Name, |
174 | ParsedType ObjectTypePtr, |
175 | bool EnteringContext, |
176 | TemplateTy &TemplateResult, |
177 | bool &MemberOfUnknownSpecialization, |
178 | bool Disambiguation) { |
179 | assert(getLangOpts().CPlusPlus && "No template names in C!")((void)0); |
180 | |
181 | DeclarationName TName; |
182 | MemberOfUnknownSpecialization = false; |
183 | |
184 | switch (Name.getKind()) { |
185 | case UnqualifiedIdKind::IK_Identifier: |
186 | TName = DeclarationName(Name.Identifier); |
187 | break; |
188 | |
189 | case UnqualifiedIdKind::IK_OperatorFunctionId: |
190 | TName = Context.DeclarationNames.getCXXOperatorName( |
191 | Name.OperatorFunctionId.Operator); |
192 | break; |
193 | |
194 | case UnqualifiedIdKind::IK_LiteralOperatorId: |
195 | TName = Context.DeclarationNames.getCXXLiteralOperatorName(Name.Identifier); |
196 | break; |
197 | |
198 | default: |
199 | return TNK_Non_template; |
200 | } |
201 | |
202 | QualType ObjectType = ObjectTypePtr.get(); |
203 | |
204 | AssumedTemplateKind AssumedTemplate; |
205 | LookupResult R(*this, TName, Name.getBeginLoc(), LookupOrdinaryName); |
206 | if (LookupTemplateName(R, S, SS, ObjectType, EnteringContext, |
207 | MemberOfUnknownSpecialization, SourceLocation(), |
208 | &AssumedTemplate, |
209 | /*AllowTypoCorrection=*/!Disambiguation)) |
210 | return TNK_Non_template; |
211 | |
212 | if (AssumedTemplate != AssumedTemplateKind::None) { |
213 | TemplateResult = TemplateTy::make(Context.getAssumedTemplateName(TName)); |
214 | // Let the parser know whether we found nothing or found functions; if we |
215 | // found nothing, we want to more carefully check whether this is actually |
216 | // a function template name versus some other kind of undeclared identifier. |
217 | return AssumedTemplate == AssumedTemplateKind::FoundNothing |
218 | ? TNK_Undeclared_template |
219 | : TNK_Function_template; |
220 | } |
221 | |
222 | if (R.empty()) |
223 | return TNK_Non_template; |
224 | |
225 | NamedDecl *D = nullptr; |
226 | if (R.isAmbiguous()) { |
227 | // If we got an ambiguity involving a non-function template, treat this |
228 | // as a template name, and pick an arbitrary template for error recovery. |
229 | bool AnyFunctionTemplates = false; |
230 | for (NamedDecl *FoundD : R) { |
231 | if (NamedDecl *FoundTemplate = getAsTemplateNameDecl(FoundD)) { |
232 | if (isa<FunctionTemplateDecl>(FoundTemplate)) |
233 | AnyFunctionTemplates = true; |
234 | else { |
235 | D = FoundTemplate; |
236 | break; |
237 | } |
238 | } |
239 | } |
240 | |
241 | // If we didn't find any templates at all, this isn't a template name. |
242 | // Leave the ambiguity for a later lookup to diagnose. |
243 | if (!D && !AnyFunctionTemplates) { |
244 | R.suppressDiagnostics(); |
245 | return TNK_Non_template; |
246 | } |
247 | |
248 | // If the only templates were function templates, filter out the rest. |
249 | // We'll diagnose the ambiguity later. |
250 | if (!D) |
251 | FilterAcceptableTemplateNames(R); |
252 | } |
253 | |
254 | // At this point, we have either picked a single template name declaration D |
255 | // or we have a non-empty set of results R containing either one template name |
256 | // declaration or a set of function templates. |
257 | |
258 | TemplateName Template; |
259 | TemplateNameKind TemplateKind; |
260 | |
261 | unsigned ResultCount = R.end() - R.begin(); |
262 | if (!D && ResultCount > 1) { |
263 | // We assume that we'll preserve the qualifier from a function |
264 | // template name in other ways. |
265 | Template = Context.getOverloadedTemplateName(R.begin(), R.end()); |
266 | TemplateKind = TNK_Function_template; |
267 | |
268 | // We'll do this lookup again later. |
269 | R.suppressDiagnostics(); |
270 | } else { |
271 | if (!D) { |
272 | D = getAsTemplateNameDecl(*R.begin()); |
273 | assert(D && "unambiguous result is not a template name")((void)0); |
274 | } |
275 | |
276 | if (isa<UnresolvedUsingValueDecl>(D)) { |
277 | // We don't yet know whether this is a template-name or not. |
278 | MemberOfUnknownSpecialization = true; |
279 | return TNK_Non_template; |
280 | } |
281 | |
282 | TemplateDecl *TD = cast<TemplateDecl>(D); |
283 | |
284 | if (SS.isSet() && !SS.isInvalid()) { |
285 | NestedNameSpecifier *Qualifier = SS.getScopeRep(); |
286 | Template = Context.getQualifiedTemplateName(Qualifier, |
287 | hasTemplateKeyword, TD); |
288 | } else { |
289 | Template = TemplateName(TD); |
290 | } |
291 | |
292 | if (isa<FunctionTemplateDecl>(TD)) { |
293 | TemplateKind = TNK_Function_template; |
294 | |
295 | // We'll do this lookup again later. |
296 | R.suppressDiagnostics(); |
297 | } else { |
298 | assert(isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) ||((void)0) |
299 | isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) ||((void)0) |
300 | isa<BuiltinTemplateDecl>(TD) || isa<ConceptDecl>(TD))((void)0); |
301 | TemplateKind = |
302 | isa<VarTemplateDecl>(TD) ? TNK_Var_template : |
303 | isa<ConceptDecl>(TD) ? TNK_Concept_template : |
304 | TNK_Type_template; |
305 | } |
306 | } |
307 | |
308 | TemplateResult = TemplateTy::make(Template); |
309 | return TemplateKind; |
310 | } |
311 | |
312 | bool Sema::isDeductionGuideName(Scope *S, const IdentifierInfo &Name, |
313 | SourceLocation NameLoc, |
314 | ParsedTemplateTy *Template) { |
315 | CXXScopeSpec SS; |
316 | bool MemberOfUnknownSpecialization = false; |
317 | |
318 | // We could use redeclaration lookup here, but we don't need to: the |
319 | // syntactic form of a deduction guide is enough to identify it even |
320 | // if we can't look up the template name at all. |
321 | LookupResult R(*this, DeclarationName(&Name), NameLoc, LookupOrdinaryName); |
322 | if (LookupTemplateName(R, S, SS, /*ObjectType*/ QualType(), |
323 | /*EnteringContext*/ false, |
324 | MemberOfUnknownSpecialization)) |
325 | return false; |
326 | |
327 | if (R.empty()) return false; |
328 | if (R.isAmbiguous()) { |
329 | // FIXME: Diagnose an ambiguity if we find at least one template. |
330 | R.suppressDiagnostics(); |
331 | return false; |
332 | } |
333 | |
334 | // We only treat template-names that name type templates as valid deduction |
335 | // guide names. |
336 | TemplateDecl *TD = R.getAsSingle<TemplateDecl>(); |
337 | if (!TD || !getAsTypeTemplateDecl(TD)) |
338 | return false; |
339 | |
340 | if (Template) |
341 | *Template = TemplateTy::make(TemplateName(TD)); |
342 | return true; |
343 | } |
344 | |
345 | bool Sema::DiagnoseUnknownTemplateName(const IdentifierInfo &II, |
346 | SourceLocation IILoc, |
347 | Scope *S, |
348 | const CXXScopeSpec *SS, |
349 | TemplateTy &SuggestedTemplate, |
350 | TemplateNameKind &SuggestedKind) { |
351 | // We can't recover unless there's a dependent scope specifier preceding the |
352 | // template name. |
353 | // FIXME: Typo correction? |
354 | if (!SS || !SS->isSet() || !isDependentScopeSpecifier(*SS) || |
355 | computeDeclContext(*SS)) |
356 | return false; |
357 | |
358 | // The code is missing a 'template' keyword prior to the dependent template |
359 | // name. |
360 | NestedNameSpecifier *Qualifier = (NestedNameSpecifier*)SS->getScopeRep(); |
361 | Diag(IILoc, diag::err_template_kw_missing) |
362 | << Qualifier << II.getName() |
363 | << FixItHint::CreateInsertion(IILoc, "template "); |
364 | SuggestedTemplate |
365 | = TemplateTy::make(Context.getDependentTemplateName(Qualifier, &II)); |
366 | SuggestedKind = TNK_Dependent_template_name; |
367 | return true; |
368 | } |
369 | |
370 | bool Sema::LookupTemplateName(LookupResult &Found, |
371 | Scope *S, CXXScopeSpec &SS, |
372 | QualType ObjectType, |
373 | bool EnteringContext, |
374 | bool &MemberOfUnknownSpecialization, |
375 | RequiredTemplateKind RequiredTemplate, |
376 | AssumedTemplateKind *ATK, |
377 | bool AllowTypoCorrection) { |
378 | if (ATK) |
379 | *ATK = AssumedTemplateKind::None; |
380 | |
381 | if (SS.isInvalid()) |
382 | return true; |
383 | |
384 | Found.setTemplateNameLookup(true); |
385 | |
386 | // Determine where to perform name lookup |
387 | MemberOfUnknownSpecialization = false; |
388 | DeclContext *LookupCtx = nullptr; |
389 | bool IsDependent = false; |
390 | if (!ObjectType.isNull()) { |
391 | // This nested-name-specifier occurs in a member access expression, e.g., |
392 | // x->B::f, and we are looking into the type of the object. |
393 | assert(SS.isEmpty() && "ObjectType and scope specifier cannot coexist")((void)0); |
394 | LookupCtx = computeDeclContext(ObjectType); |
395 | IsDependent = !LookupCtx && ObjectType->isDependentType(); |
396 | assert((IsDependent || !ObjectType->isIncompleteType() ||((void)0) |
397 | ObjectType->castAs<TagType>()->isBeingDefined()) &&((void)0) |
398 | "Caller should have completed object type")((void)0); |
399 | |
400 | // Template names cannot appear inside an Objective-C class or object type |
401 | // or a vector type. |
402 | // |
403 | // FIXME: This is wrong. For example: |
404 | // |
405 | // template<typename T> using Vec = T __attribute__((ext_vector_type(4))); |
406 | // Vec<int> vi; |
407 | // vi.Vec<int>::~Vec<int>(); |
408 | // |
409 | // ... should be accepted but we will not treat 'Vec' as a template name |
410 | // here. The right thing to do would be to check if the name is a valid |
411 | // vector component name, and look up a template name if not. And similarly |
412 | // for lookups into Objective-C class and object types, where the same |
413 | // problem can arise. |
414 | if (ObjectType->isObjCObjectOrInterfaceType() || |
415 | ObjectType->isVectorType()) { |
416 | Found.clear(); |
417 | return false; |
418 | } |
419 | } else if (SS.isNotEmpty()) { |
420 | // This nested-name-specifier occurs after another nested-name-specifier, |
421 | // so long into the context associated with the prior nested-name-specifier. |
422 | LookupCtx = computeDeclContext(SS, EnteringContext); |
423 | IsDependent = !LookupCtx && isDependentScopeSpecifier(SS); |
424 | |
425 | // The declaration context must be complete. |
426 | if (LookupCtx && RequireCompleteDeclContext(SS, LookupCtx)) |
427 | return true; |
428 | } |
429 | |
430 | bool ObjectTypeSearchedInScope = false; |
431 | bool AllowFunctionTemplatesInLookup = true; |
432 | if (LookupCtx) { |
433 | // Perform "qualified" name lookup into the declaration context we |
434 | // computed, which is either the type of the base of a member access |
435 | // expression or the declaration context associated with a prior |
436 | // nested-name-specifier. |
437 | LookupQualifiedName(Found, LookupCtx); |
438 | |
439 | // FIXME: The C++ standard does not clearly specify what happens in the |
440 | // case where the object type is dependent, and implementations vary. In |
441 | // Clang, we treat a name after a . or -> as a template-name if lookup |
442 | // finds a non-dependent member or member of the current instantiation that |
443 | // is a type template, or finds no such members and lookup in the context |
444 | // of the postfix-expression finds a type template. In the latter case, the |
445 | // name is nonetheless dependent, and we may resolve it to a member of an |
446 | // unknown specialization when we come to instantiate the template. |
447 | IsDependent |= Found.wasNotFoundInCurrentInstantiation(); |
448 | } |
449 | |
450 | if (SS.isEmpty() && (ObjectType.isNull() || Found.empty())) { |
451 | // C++ [basic.lookup.classref]p1: |
452 | // In a class member access expression (5.2.5), if the . or -> token is |
453 | // immediately followed by an identifier followed by a <, the |
454 | // identifier must be looked up to determine whether the < is the |
455 | // beginning of a template argument list (14.2) or a less-than operator. |
456 | // The identifier is first looked up in the class of the object |
457 | // expression. If the identifier is not found, it is then looked up in |
458 | // the context of the entire postfix-expression and shall name a class |
459 | // template. |
460 | if (S) |
461 | LookupName(Found, S); |
462 | |
463 | if (!ObjectType.isNull()) { |
464 | // FIXME: We should filter out all non-type templates here, particularly |
465 | // variable templates and concepts. But the exclusion of alias templates |
466 | // and template template parameters is a wording defect. |
467 | AllowFunctionTemplatesInLookup = false; |
468 | ObjectTypeSearchedInScope = true; |
469 | } |
470 | |
471 | IsDependent |= Found.wasNotFoundInCurrentInstantiation(); |
472 | } |
473 | |
474 | if (Found.isAmbiguous()) |
475 | return false; |
476 | |
477 | if (ATK && SS.isEmpty() && ObjectType.isNull() && |
478 | !RequiredTemplate.hasTemplateKeyword()) { |
479 | // C++2a [temp.names]p2: |
480 | // A name is also considered to refer to a template if it is an |
481 | // unqualified-id followed by a < and name lookup finds either one or more |
482 | // functions or finds nothing. |
483 | // |
484 | // To keep our behavior consistent, we apply the "finds nothing" part in |
485 | // all language modes, and diagnose the empty lookup in ActOnCallExpr if we |
486 | // successfully form a call to an undeclared template-id. |
487 | bool AllFunctions = |
488 | getLangOpts().CPlusPlus20 && |
489 | std::all_of(Found.begin(), Found.end(), [](NamedDecl *ND) { |
490 | return isa<FunctionDecl>(ND->getUnderlyingDecl()); |
491 | }); |
492 | if (AllFunctions || (Found.empty() && !IsDependent)) { |
493 | // If lookup found any functions, or if this is a name that can only be |
494 | // used for a function, then strongly assume this is a function |
495 | // template-id. |
496 | *ATK = (Found.empty() && Found.getLookupName().isIdentifier()) |
497 | ? AssumedTemplateKind::FoundNothing |
498 | : AssumedTemplateKind::FoundFunctions; |
499 | Found.clear(); |
500 | return false; |
501 | } |
502 | } |
503 | |
504 | if (Found.empty() && !IsDependent && AllowTypoCorrection) { |
505 | // If we did not find any names, and this is not a disambiguation, attempt |
506 | // to correct any typos. |
507 | DeclarationName Name = Found.getLookupName(); |
508 | Found.clear(); |
509 | // Simple filter callback that, for keywords, only accepts the C++ *_cast |
510 | DefaultFilterCCC FilterCCC{}; |
511 | FilterCCC.WantTypeSpecifiers = false; |
512 | FilterCCC.WantExpressionKeywords = false; |
513 | FilterCCC.WantRemainingKeywords = false; |
514 | FilterCCC.WantCXXNamedCasts = true; |
515 | if (TypoCorrection Corrected = |
516 | CorrectTypo(Found.getLookupNameInfo(), Found.getLookupKind(), S, |
517 | &SS, FilterCCC, CTK_ErrorRecovery, LookupCtx)) { |
518 | if (auto *ND = Corrected.getFoundDecl()) |
519 | Found.addDecl(ND); |
520 | FilterAcceptableTemplateNames(Found); |
521 | if (Found.isAmbiguous()) { |
522 | Found.clear(); |
523 | } else if (!Found.empty()) { |
524 | Found.setLookupName(Corrected.getCorrection()); |
525 | if (LookupCtx) { |
526 | std::string CorrectedStr(Corrected.getAsString(getLangOpts())); |
527 | bool DroppedSpecifier = Corrected.WillReplaceSpecifier() && |
528 | Name.getAsString() == CorrectedStr; |
529 | diagnoseTypo(Corrected, PDiag(diag::err_no_member_template_suggest) |
530 | << Name << LookupCtx << DroppedSpecifier |
531 | << SS.getRange()); |
532 | } else { |
533 | diagnoseTypo(Corrected, PDiag(diag::err_no_template_suggest) << Name); |
534 | } |
535 | } |
536 | } |
537 | } |
538 | |
539 | NamedDecl *ExampleLookupResult = |
540 | Found.empty() ? nullptr : Found.getRepresentativeDecl(); |
541 | FilterAcceptableTemplateNames(Found, AllowFunctionTemplatesInLookup); |
542 | if (Found.empty()) { |
543 | if (IsDependent) { |
544 | MemberOfUnknownSpecialization = true; |
545 | return false; |
546 | } |
547 | |
548 | // If a 'template' keyword was used, a lookup that finds only non-template |
549 | // names is an error. |
550 | if (ExampleLookupResult && RequiredTemplate) { |
551 | Diag(Found.getNameLoc(), diag::err_template_kw_refers_to_non_template) |
552 | << Found.getLookupName() << SS.getRange() |
553 | << RequiredTemplate.hasTemplateKeyword() |
554 | << RequiredTemplate.getTemplateKeywordLoc(); |
555 | Diag(ExampleLookupResult->getUnderlyingDecl()->getLocation(), |
556 | diag::note_template_kw_refers_to_non_template) |
557 | << Found.getLookupName(); |
558 | return true; |
559 | } |
560 | |
561 | return false; |
562 | } |
563 | |
564 | if (S && !ObjectType.isNull() && !ObjectTypeSearchedInScope && |
565 | !getLangOpts().CPlusPlus11) { |
566 | // C++03 [basic.lookup.classref]p1: |
567 | // [...] If the lookup in the class of the object expression finds a |
568 | // template, the name is also looked up in the context of the entire |
569 | // postfix-expression and [...] |
570 | // |
571 | // Note: C++11 does not perform this second lookup. |
572 | LookupResult FoundOuter(*this, Found.getLookupName(), Found.getNameLoc(), |
573 | LookupOrdinaryName); |
574 | FoundOuter.setTemplateNameLookup(true); |
575 | LookupName(FoundOuter, S); |
576 | // FIXME: We silently accept an ambiguous lookup here, in violation of |
577 | // [basic.lookup]/1. |
578 | FilterAcceptableTemplateNames(FoundOuter, /*AllowFunctionTemplates=*/false); |
579 | |
580 | NamedDecl *OuterTemplate; |
581 | if (FoundOuter.empty()) { |
582 | // - if the name is not found, the name found in the class of the |
583 | // object expression is used, otherwise |
584 | } else if (FoundOuter.isAmbiguous() || !FoundOuter.isSingleResult() || |
585 | !(OuterTemplate = |
586 | getAsTemplateNameDecl(FoundOuter.getFoundDecl()))) { |
587 | // - if the name is found in the context of the entire |
588 | // postfix-expression and does not name a class template, the name |
589 | // found in the class of the object expression is used, otherwise |
590 | FoundOuter.clear(); |
591 | } else if (!Found.isSuppressingDiagnostics()) { |
592 | // - if the name found is a class template, it must refer to the same |
593 | // entity as the one found in the class of the object expression, |
594 | // otherwise the program is ill-formed. |
595 | if (!Found.isSingleResult() || |
596 | getAsTemplateNameDecl(Found.getFoundDecl())->getCanonicalDecl() != |
597 | OuterTemplate->getCanonicalDecl()) { |
598 | Diag(Found.getNameLoc(), |
599 | diag::ext_nested_name_member_ref_lookup_ambiguous) |
600 | << Found.getLookupName() |
601 | << ObjectType; |
602 | Diag(Found.getRepresentativeDecl()->getLocation(), |
603 | diag::note_ambig_member_ref_object_type) |
604 | << ObjectType; |
605 | Diag(FoundOuter.getFoundDecl()->getLocation(), |
606 | diag::note_ambig_member_ref_scope); |
607 | |
608 | // Recover by taking the template that we found in the object |
609 | // expression's type. |
610 | } |
611 | } |
612 | } |
613 | |
614 | return false; |
615 | } |
616 | |
617 | void Sema::diagnoseExprIntendedAsTemplateName(Scope *S, ExprResult TemplateName, |
618 | SourceLocation Less, |
619 | SourceLocation Greater) { |
620 | if (TemplateName.isInvalid()) |
621 | return; |
622 | |
623 | DeclarationNameInfo NameInfo; |
624 | CXXScopeSpec SS; |
625 | LookupNameKind LookupKind; |
626 | |
627 | DeclContext *LookupCtx = nullptr; |
628 | NamedDecl *Found = nullptr; |
629 | bool MissingTemplateKeyword = false; |
630 | |
631 | // Figure out what name we looked up. |
632 | if (auto *DRE = dyn_cast<DeclRefExpr>(TemplateName.get())) { |
633 | NameInfo = DRE->getNameInfo(); |
634 | SS.Adopt(DRE->getQualifierLoc()); |
635 | LookupKind = LookupOrdinaryName; |
636 | Found = DRE->getFoundDecl(); |
637 | } else if (auto *ME = dyn_cast<MemberExpr>(TemplateName.get())) { |
638 | NameInfo = ME->getMemberNameInfo(); |
639 | SS.Adopt(ME->getQualifierLoc()); |
640 | LookupKind = LookupMemberName; |
641 | LookupCtx = ME->getBase()->getType()->getAsCXXRecordDecl(); |
642 | Found = ME->getMemberDecl(); |
643 | } else if (auto *DSDRE = |
644 | dyn_cast<DependentScopeDeclRefExpr>(TemplateName.get())) { |
645 | NameInfo = DSDRE->getNameInfo(); |
646 | SS.Adopt(DSDRE->getQualifierLoc()); |
647 | MissingTemplateKeyword = true; |
648 | } else if (auto *DSME = |
649 | dyn_cast<CXXDependentScopeMemberExpr>(TemplateName.get())) { |
650 | NameInfo = DSME->getMemberNameInfo(); |
651 | SS.Adopt(DSME->getQualifierLoc()); |
652 | MissingTemplateKeyword = true; |
653 | } else { |
654 | llvm_unreachable("unexpected kind of potential template name")__builtin_unreachable(); |
655 | } |
656 | |
657 | // If this is a dependent-scope lookup, diagnose that the 'template' keyword |
658 | // was missing. |
659 | if (MissingTemplateKeyword) { |
660 | Diag(NameInfo.getBeginLoc(), diag::err_template_kw_missing) |
661 | << "" << NameInfo.getName().getAsString() << SourceRange(Less, Greater); |
662 | return; |
663 | } |
664 | |
665 | // Try to correct the name by looking for templates and C++ named casts. |
666 | struct TemplateCandidateFilter : CorrectionCandidateCallback { |
667 | Sema &S; |
668 | TemplateCandidateFilter(Sema &S) : S(S) { |
669 | WantTypeSpecifiers = false; |
670 | WantExpressionKeywords = false; |
671 | WantRemainingKeywords = false; |
672 | WantCXXNamedCasts = true; |
673 | }; |
674 | bool ValidateCandidate(const TypoCorrection &Candidate) override { |
675 | if (auto *ND = Candidate.getCorrectionDecl()) |
676 | return S.getAsTemplateNameDecl(ND); |
677 | return Candidate.isKeyword(); |
678 | } |
679 | |
680 | std::unique_ptr<CorrectionCandidateCallback> clone() override { |
681 | return std::make_unique<TemplateCandidateFilter>(*this); |
682 | } |
683 | }; |
684 | |
685 | DeclarationName Name = NameInfo.getName(); |
686 | TemplateCandidateFilter CCC(*this); |
687 | if (TypoCorrection Corrected = CorrectTypo(NameInfo, LookupKind, S, &SS, CCC, |
688 | CTK_ErrorRecovery, LookupCtx)) { |
689 | auto *ND = Corrected.getFoundDecl(); |
690 | if (ND) |
691 | ND = getAsTemplateNameDecl(ND); |
692 | if (ND || Corrected.isKeyword()) { |
693 | if (LookupCtx) { |
694 | std::string CorrectedStr(Corrected.getAsString(getLangOpts())); |
695 | bool DroppedSpecifier = Corrected.WillReplaceSpecifier() && |
696 | Name.getAsString() == CorrectedStr; |
697 | diagnoseTypo(Corrected, |
698 | PDiag(diag::err_non_template_in_member_template_id_suggest) |
699 | << Name << LookupCtx << DroppedSpecifier |
700 | << SS.getRange(), false); |
701 | } else { |
702 | diagnoseTypo(Corrected, |
703 | PDiag(diag::err_non_template_in_template_id_suggest) |
704 | << Name, false); |
705 | } |
706 | if (Found) |
707 | Diag(Found->getLocation(), |
708 | diag::note_non_template_in_template_id_found); |
709 | return; |
710 | } |
711 | } |
712 | |
713 | Diag(NameInfo.getLoc(), diag::err_non_template_in_template_id) |
714 | << Name << SourceRange(Less, Greater); |
715 | if (Found) |
716 | Diag(Found->getLocation(), diag::note_non_template_in_template_id_found); |
717 | } |
718 | |
719 | /// ActOnDependentIdExpression - Handle a dependent id-expression that |
720 | /// was just parsed. This is only possible with an explicit scope |
721 | /// specifier naming a dependent type. |
722 | ExprResult |
723 | Sema::ActOnDependentIdExpression(const CXXScopeSpec &SS, |
724 | SourceLocation TemplateKWLoc, |
725 | const DeclarationNameInfo &NameInfo, |
726 | bool isAddressOfOperand, |
727 | const TemplateArgumentListInfo *TemplateArgs) { |
728 | DeclContext *DC = getFunctionLevelDeclContext(); |
729 | |
730 | // C++11 [expr.prim.general]p12: |
731 | // An id-expression that denotes a non-static data member or non-static |
732 | // member function of a class can only be used: |
733 | // (...) |
734 | // - if that id-expression denotes a non-static data member and it |
735 | // appears in an unevaluated operand. |
736 | // |
737 | // If this might be the case, form a DependentScopeDeclRefExpr instead of a |
738 | // CXXDependentScopeMemberExpr. The former can instantiate to either |
739 | // DeclRefExpr or MemberExpr depending on lookup results, while the latter is |
740 | // always a MemberExpr. |
741 | bool MightBeCxx11UnevalField = |
742 | getLangOpts().CPlusPlus11 && isUnevaluatedContext(); |
743 | |
744 | // Check if the nested name specifier is an enum type. |
745 | bool IsEnum = false; |
746 | if (NestedNameSpecifier *NNS = SS.getScopeRep()) |
747 | IsEnum = dyn_cast_or_null<EnumType>(NNS->getAsType()); |
748 | |
749 | if (!MightBeCxx11UnevalField && !isAddressOfOperand && !IsEnum && |
750 | isa<CXXMethodDecl>(DC) && cast<CXXMethodDecl>(DC)->isInstance()) { |
751 | QualType ThisType = cast<CXXMethodDecl>(DC)->getThisType(); |
752 | |
753 | // Since the 'this' expression is synthesized, we don't need to |
754 | // perform the double-lookup check. |
755 | NamedDecl *FirstQualifierInScope = nullptr; |
756 | |
757 | return CXXDependentScopeMemberExpr::Create( |
758 | Context, /*This*/ nullptr, ThisType, /*IsArrow*/ true, |
759 | /*Op*/ SourceLocation(), SS.getWithLocInContext(Context), TemplateKWLoc, |
760 | FirstQualifierInScope, NameInfo, TemplateArgs); |
761 | } |
762 | |
763 | return BuildDependentDeclRefExpr(SS, TemplateKWLoc, NameInfo, TemplateArgs); |
764 | } |
765 | |
766 | ExprResult |
767 | Sema::BuildDependentDeclRefExpr(const CXXScopeSpec &SS, |
768 | SourceLocation TemplateKWLoc, |
769 | const DeclarationNameInfo &NameInfo, |
770 | const TemplateArgumentListInfo *TemplateArgs) { |
771 | // DependentScopeDeclRefExpr::Create requires a valid QualifierLoc |
772 | NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); |
773 | if (!QualifierLoc) |
774 | return ExprError(); |
775 | |
776 | return DependentScopeDeclRefExpr::Create( |
777 | Context, QualifierLoc, TemplateKWLoc, NameInfo, TemplateArgs); |
778 | } |
779 | |
780 | |
781 | /// Determine whether we would be unable to instantiate this template (because |
782 | /// it either has no definition, or is in the process of being instantiated). |
783 | bool Sema::DiagnoseUninstantiableTemplate(SourceLocation PointOfInstantiation, |
784 | NamedDecl *Instantiation, |
785 | bool InstantiatedFromMember, |
786 | const NamedDecl *Pattern, |
787 | const NamedDecl *PatternDef, |
788 | TemplateSpecializationKind TSK, |
789 | bool Complain /*= true*/) { |
790 | assert(isa<TagDecl>(Instantiation) || isa<FunctionDecl>(Instantiation) ||((void)0) |
791 | isa<VarDecl>(Instantiation))((void)0); |
792 | |
793 | bool IsEntityBeingDefined = false; |
794 | if (const TagDecl *TD = dyn_cast_or_null<TagDecl>(PatternDef)) |
795 | IsEntityBeingDefined = TD->isBeingDefined(); |
796 | |
797 | if (PatternDef && !IsEntityBeingDefined) { |
798 | NamedDecl *SuggestedDef = nullptr; |
799 | if (!hasVisibleDefinition(const_cast<NamedDecl*>(PatternDef), &SuggestedDef, |
800 | /*OnlyNeedComplete*/false)) { |
801 | // If we're allowed to diagnose this and recover, do so. |
802 | bool Recover = Complain && !isSFINAEContext(); |
803 | if (Complain) |
804 | diagnoseMissingImport(PointOfInstantiation, SuggestedDef, |
805 | Sema::MissingImportKind::Definition, Recover); |
806 | return !Recover; |
807 | } |
808 | return false; |
809 | } |
810 | |
811 | if (!Complain || (PatternDef && PatternDef->isInvalidDecl())) |
812 | return true; |
813 | |
814 | llvm::Optional<unsigned> Note; |
815 | QualType InstantiationTy; |
816 | if (TagDecl *TD = dyn_cast<TagDecl>(Instantiation)) |
817 | InstantiationTy = Context.getTypeDeclType(TD); |
818 | if (PatternDef) { |
819 | Diag(PointOfInstantiation, |
820 | diag::err_template_instantiate_within_definition) |
821 | << /*implicit|explicit*/(TSK != TSK_ImplicitInstantiation) |
822 | << InstantiationTy; |
823 | // Not much point in noting the template declaration here, since |
824 | // we're lexically inside it. |
825 | Instantiation->setInvalidDecl(); |
826 | } else if (InstantiatedFromMember) { |
827 | if (isa<FunctionDecl>(Instantiation)) { |
828 | Diag(PointOfInstantiation, |
829 | diag::err_explicit_instantiation_undefined_member) |
830 | << /*member function*/ 1 << Instantiation->getDeclName() |
831 | << Instantiation->getDeclContext(); |
832 | Note = diag::note_explicit_instantiation_here; |
833 | } else { |
834 | assert(isa<TagDecl>(Instantiation) && "Must be a TagDecl!")((void)0); |
835 | Diag(PointOfInstantiation, |
836 | diag::err_implicit_instantiate_member_undefined) |
837 | << InstantiationTy; |
838 | Note = diag::note_member_declared_at; |
839 | } |
840 | } else { |
841 | if (isa<FunctionDecl>(Instantiation)) { |
842 | Diag(PointOfInstantiation, |
843 | diag::err_explicit_instantiation_undefined_func_template) |
844 | << Pattern; |
845 | Note = diag::note_explicit_instantiation_here; |
846 | } else if (isa<TagDecl>(Instantiation)) { |
847 | Diag(PointOfInstantiation, diag::err_template_instantiate_undefined) |
848 | << (TSK != TSK_ImplicitInstantiation) |
849 | << InstantiationTy; |
850 | Note = diag::note_template_decl_here; |
851 | } else { |
852 | assert(isa<VarDecl>(Instantiation) && "Must be a VarDecl!")((void)0); |
853 | if (isa<VarTemplateSpecializationDecl>(Instantiation)) { |
854 | Diag(PointOfInstantiation, |
855 | diag::err_explicit_instantiation_undefined_var_template) |
856 | << Instantiation; |
857 | Instantiation->setInvalidDecl(); |
858 | } else |
859 | Diag(PointOfInstantiation, |
860 | diag::err_explicit_instantiation_undefined_member) |
861 | << /*static data member*/ 2 << Instantiation->getDeclName() |
862 | << Instantiation->getDeclContext(); |
863 | Note = diag::note_explicit_instantiation_here; |
864 | } |
865 | } |
866 | if (Note) // Diagnostics were emitted. |
867 | Diag(Pattern->getLocation(), Note.getValue()); |
868 | |
869 | // In general, Instantiation isn't marked invalid to get more than one |
870 | // error for multiple undefined instantiations. But the code that does |
871 | // explicit declaration -> explicit definition conversion can't handle |
872 | // invalid declarations, so mark as invalid in that case. |
873 | if (TSK == TSK_ExplicitInstantiationDeclaration) |
874 | Instantiation->setInvalidDecl(); |
875 | return true; |
876 | } |
877 | |
878 | /// DiagnoseTemplateParameterShadow - Produce a diagnostic complaining |
879 | /// that the template parameter 'PrevDecl' is being shadowed by a new |
880 | /// declaration at location Loc. Returns true to indicate that this is |
881 | /// an error, and false otherwise. |
882 | void Sema::DiagnoseTemplateParameterShadow(SourceLocation Loc, Decl *PrevDecl) { |
883 | assert(PrevDecl->isTemplateParameter() && "Not a template parameter")((void)0); |
884 | |
885 | // C++ [temp.local]p4: |
886 | // A template-parameter shall not be redeclared within its |
887 | // scope (including nested scopes). |
888 | // |
889 | // Make this a warning when MSVC compatibility is requested. |
890 | unsigned DiagId = getLangOpts().MSVCCompat ? diag::ext_template_param_shadow |
891 | : diag::err_template_param_shadow; |
892 | Diag(Loc, DiagId) << cast<NamedDecl>(PrevDecl)->getDeclName(); |
893 | Diag(PrevDecl->getLocation(), diag::note_template_param_here); |
894 | } |
895 | |
896 | /// AdjustDeclIfTemplate - If the given decl happens to be a template, reset |
897 | /// the parameter D to reference the templated declaration and return a pointer |
898 | /// to the template declaration. Otherwise, do nothing to D and return null. |
899 | TemplateDecl *Sema::AdjustDeclIfTemplate(Decl *&D) { |
900 | if (TemplateDecl *Temp = dyn_cast_or_null<TemplateDecl>(D)) { |
901 | D = Temp->getTemplatedDecl(); |
902 | return Temp; |
903 | } |
904 | return nullptr; |
905 | } |
906 | |
907 | ParsedTemplateArgument ParsedTemplateArgument::getTemplatePackExpansion( |
908 | SourceLocation EllipsisLoc) const { |
909 | assert(Kind == Template &&((void)0) |
910 | "Only template template arguments can be pack expansions here")((void)0); |
911 | assert(getAsTemplate().get().containsUnexpandedParameterPack() &&((void)0) |
912 | "Template template argument pack expansion without packs")((void)0); |
913 | ParsedTemplateArgument Result(*this); |
914 | Result.EllipsisLoc = EllipsisLoc; |
915 | return Result; |
916 | } |
917 | |
918 | static TemplateArgumentLoc translateTemplateArgument(Sema &SemaRef, |
919 | const ParsedTemplateArgument &Arg) { |
920 | |
921 | switch (Arg.getKind()) { |
922 | case ParsedTemplateArgument::Type: { |
923 | TypeSourceInfo *DI; |
924 | QualType T = SemaRef.GetTypeFromParser(Arg.getAsType(), &DI); |
925 | if (!DI) |
926 | DI = SemaRef.Context.getTrivialTypeSourceInfo(T, Arg.getLocation()); |
927 | return TemplateArgumentLoc(TemplateArgument(T), DI); |
928 | } |
929 | |
930 | case ParsedTemplateArgument::NonType: { |
931 | Expr *E = static_cast<Expr *>(Arg.getAsExpr()); |
932 | return TemplateArgumentLoc(TemplateArgument(E), E); |
933 | } |
934 | |
935 | case ParsedTemplateArgument::Template: { |
936 | TemplateName Template = Arg.getAsTemplate().get(); |
937 | TemplateArgument TArg; |
938 | if (Arg.getEllipsisLoc().isValid()) |
939 | TArg = TemplateArgument(Template, Optional<unsigned int>()); |
940 | else |
941 | TArg = Template; |
942 | return TemplateArgumentLoc( |
943 | SemaRef.Context, TArg, |
944 | Arg.getScopeSpec().getWithLocInContext(SemaRef.Context), |
945 | Arg.getLocation(), Arg.getEllipsisLoc()); |
946 | } |
947 | } |
948 | |
949 | llvm_unreachable("Unhandled parsed template argument")__builtin_unreachable(); |
950 | } |
951 | |
952 | /// Translates template arguments as provided by the parser |
953 | /// into template arguments used by semantic analysis. |
954 | void Sema::translateTemplateArguments(const ASTTemplateArgsPtr &TemplateArgsIn, |
955 | TemplateArgumentListInfo &TemplateArgs) { |
956 | for (unsigned I = 0, Last = TemplateArgsIn.size(); I != Last; ++I) |
957 | TemplateArgs.addArgument(translateTemplateArgument(*this, |
958 | TemplateArgsIn[I])); |
959 | } |
960 | |
961 | static void maybeDiagnoseTemplateParameterShadow(Sema &SemaRef, Scope *S, |
962 | SourceLocation Loc, |
963 | IdentifierInfo *Name) { |
964 | NamedDecl *PrevDecl = SemaRef.LookupSingleName( |
965 | S, Name, Loc, Sema::LookupOrdinaryName, Sema::ForVisibleRedeclaration); |
966 | if (PrevDecl && PrevDecl->isTemplateParameter()) |
967 | SemaRef.DiagnoseTemplateParameterShadow(Loc, PrevDecl); |
968 | } |
969 | |
970 | /// Convert a parsed type into a parsed template argument. This is mostly |
971 | /// trivial, except that we may have parsed a C++17 deduced class template |
972 | /// specialization type, in which case we should form a template template |
973 | /// argument instead of a type template argument. |
974 | ParsedTemplateArgument Sema::ActOnTemplateTypeArgument(TypeResult ParsedType) { |
975 | TypeSourceInfo *TInfo; |
976 | QualType T = GetTypeFromParser(ParsedType.get(), &TInfo); |
977 | if (T.isNull()) |
978 | return ParsedTemplateArgument(); |
979 | assert(TInfo && "template argument with no location")((void)0); |
980 | |
981 | // If we might have formed a deduced template specialization type, convert |
982 | // it to a template template argument. |
983 | if (getLangOpts().CPlusPlus17) { |
984 | TypeLoc TL = TInfo->getTypeLoc(); |
985 | SourceLocation EllipsisLoc; |
986 | if (auto PET = TL.getAs<PackExpansionTypeLoc>()) { |
987 | EllipsisLoc = PET.getEllipsisLoc(); |
988 | TL = PET.getPatternLoc(); |
989 | } |
990 | |
991 | CXXScopeSpec SS; |
992 | if (auto ET = TL.getAs<ElaboratedTypeLoc>()) { |
993 | SS.Adopt(ET.getQualifierLoc()); |
994 | TL = ET.getNamedTypeLoc(); |
995 | } |
996 | |
997 | if (auto DTST = TL.getAs<DeducedTemplateSpecializationTypeLoc>()) { |
998 | TemplateName Name = DTST.getTypePtr()->getTemplateName(); |
999 | if (SS.isSet()) |
1000 | Name = Context.getQualifiedTemplateName(SS.getScopeRep(), |
1001 | /*HasTemplateKeyword*/ false, |
1002 | Name.getAsTemplateDecl()); |
1003 | ParsedTemplateArgument Result(SS, TemplateTy::make(Name), |
1004 | DTST.getTemplateNameLoc()); |
1005 | if (EllipsisLoc.isValid()) |
1006 | Result = Result.getTemplatePackExpansion(EllipsisLoc); |
1007 | return Result; |
1008 | } |
1009 | } |
1010 | |
1011 | // This is a normal type template argument. Note, if the type template |
1012 | // argument is an injected-class-name for a template, it has a dual nature |
1013 | // and can be used as either a type or a template. We handle that in |
1014 | // convertTypeTemplateArgumentToTemplate. |
1015 | return ParsedTemplateArgument(ParsedTemplateArgument::Type, |
1016 | ParsedType.get().getAsOpaquePtr(), |
1017 | TInfo->getTypeLoc().getBeginLoc()); |
1018 | } |
1019 | |
1020 | /// ActOnTypeParameter - Called when a C++ template type parameter |
1021 | /// (e.g., "typename T") has been parsed. Typename specifies whether |
1022 | /// the keyword "typename" was used to declare the type parameter |
1023 | /// (otherwise, "class" was used), and KeyLoc is the location of the |
1024 | /// "class" or "typename" keyword. ParamName is the name of the |
1025 | /// parameter (NULL indicates an unnamed template parameter) and |
1026 | /// ParamNameLoc is the location of the parameter name (if any). |
1027 | /// If the type parameter has a default argument, it will be added |
1028 | /// later via ActOnTypeParameterDefault. |
1029 | NamedDecl *Sema::ActOnTypeParameter(Scope *S, bool Typename, |
1030 | SourceLocation EllipsisLoc, |
1031 | SourceLocation KeyLoc, |
1032 | IdentifierInfo *ParamName, |
1033 | SourceLocation ParamNameLoc, |
1034 | unsigned Depth, unsigned Position, |
1035 | SourceLocation EqualLoc, |
1036 | ParsedType DefaultArg, |
1037 | bool HasTypeConstraint) { |
1038 | assert(S->isTemplateParamScope() &&((void)0) |
1039 | "Template type parameter not in template parameter scope!")((void)0); |
1040 | |
1041 | bool IsParameterPack = EllipsisLoc.isValid(); |
1042 | TemplateTypeParmDecl *Param |
1043 | = TemplateTypeParmDecl::Create(Context, Context.getTranslationUnitDecl(), |
1044 | KeyLoc, ParamNameLoc, Depth, Position, |
1045 | ParamName, Typename, IsParameterPack, |
1046 | HasTypeConstraint); |
1047 | Param->setAccess(AS_public); |
1048 | |
1049 | if (Param->isParameterPack()) |
1050 | if (auto *LSI = getEnclosingLambda()) |
1051 | LSI->LocalPacks.push_back(Param); |
1052 | |
1053 | if (ParamName) { |
1054 | maybeDiagnoseTemplateParameterShadow(*this, S, ParamNameLoc, ParamName); |
1055 | |
1056 | // Add the template parameter into the current scope. |
1057 | S->AddDecl(Param); |
1058 | IdResolver.AddDecl(Param); |
1059 | } |
1060 | |
1061 | // C++0x [temp.param]p9: |
1062 | // A default template-argument may be specified for any kind of |
1063 | // template-parameter that is not a template parameter pack. |
1064 | if (DefaultArg && IsParameterPack) { |
1065 | Diag(EqualLoc, diag::err_template_param_pack_default_arg); |
1066 | DefaultArg = nullptr; |
1067 | } |
1068 | |
1069 | // Handle the default argument, if provided. |
1070 | if (DefaultArg) { |
1071 | TypeSourceInfo *DefaultTInfo; |
1072 | GetTypeFromParser(DefaultArg, &DefaultTInfo); |
1073 | |
1074 | assert(DefaultTInfo && "expected source information for type")((void)0); |
1075 | |
1076 | // Check for unexpanded parameter packs. |
1077 | if (DiagnoseUnexpandedParameterPack(ParamNameLoc, DefaultTInfo, |
1078 | UPPC_DefaultArgument)) |
1079 | return Param; |
1080 | |
1081 | // Check the template argument itself. |
1082 | if (CheckTemplateArgument(DefaultTInfo)) { |
1083 | Param->setInvalidDecl(); |
1084 | return Param; |
1085 | } |
1086 | |
1087 | Param->setDefaultArgument(DefaultTInfo); |
1088 | } |
1089 | |
1090 | return Param; |
1091 | } |
1092 | |
1093 | /// Convert the parser's template argument list representation into our form. |
1094 | static TemplateArgumentListInfo |
1095 | makeTemplateArgumentListInfo(Sema &S, TemplateIdAnnotation &TemplateId) { |
1096 | TemplateArgumentListInfo TemplateArgs(TemplateId.LAngleLoc, |
1097 | TemplateId.RAngleLoc); |
1098 | ASTTemplateArgsPtr TemplateArgsPtr(TemplateId.getTemplateArgs(), |
1099 | TemplateId.NumArgs); |
1100 | S.translateTemplateArguments(TemplateArgsPtr, TemplateArgs); |
1101 | return TemplateArgs; |
1102 | } |
1103 | |
1104 | bool Sema::ActOnTypeConstraint(const CXXScopeSpec &SS, |
1105 | TemplateIdAnnotation *TypeConstr, |
1106 | TemplateTypeParmDecl *ConstrainedParameter, |
1107 | SourceLocation EllipsisLoc) { |
1108 | return BuildTypeConstraint(SS, TypeConstr, ConstrainedParameter, EllipsisLoc, |
1109 | false); |
1110 | } |
1111 | |
1112 | bool Sema::BuildTypeConstraint(const CXXScopeSpec &SS, |
1113 | TemplateIdAnnotation *TypeConstr, |
1114 | TemplateTypeParmDecl *ConstrainedParameter, |
1115 | SourceLocation EllipsisLoc, |
1116 | bool AllowUnexpandedPack) { |
1117 | TemplateName TN = TypeConstr->Template.get(); |
1118 | ConceptDecl *CD = cast<ConceptDecl>(TN.getAsTemplateDecl()); |
1119 | |
1120 | // C++2a [temp.param]p4: |
1121 | // [...] The concept designated by a type-constraint shall be a type |
1122 | // concept ([temp.concept]). |
1123 | if (!CD->isTypeConcept()) { |
1124 | Diag(TypeConstr->TemplateNameLoc, |
1125 | diag::err_type_constraint_non_type_concept); |
1126 | return true; |
1127 | } |
1128 | |
1129 | bool WereArgsSpecified = TypeConstr->LAngleLoc.isValid(); |
1130 | |
1131 | if (!WereArgsSpecified && |
1132 | CD->getTemplateParameters()->getMinRequiredArguments() > 1) { |
1133 | Diag(TypeConstr->TemplateNameLoc, |
1134 | diag::err_type_constraint_missing_arguments) << CD; |
1135 | return true; |
1136 | } |
1137 | |
1138 | DeclarationNameInfo ConceptName(DeclarationName(TypeConstr->Name), |
1139 | TypeConstr->TemplateNameLoc); |
1140 | |
1141 | TemplateArgumentListInfo TemplateArgs; |
1142 | if (TypeConstr->LAngleLoc.isValid()) { |
1143 | TemplateArgs = |
1144 | makeTemplateArgumentListInfo(*this, *TypeConstr); |
1145 | |
1146 | if (EllipsisLoc.isInvalid() && !AllowUnexpandedPack) { |
1147 | for (TemplateArgumentLoc Arg : TemplateArgs.arguments()) { |
1148 | if (DiagnoseUnexpandedParameterPack(Arg, UPPC_TypeConstraint)) |
1149 | return true; |
1150 | } |
1151 | } |
1152 | } |
1153 | return AttachTypeConstraint( |
1154 | SS.isSet() ? SS.getWithLocInContext(Context) : NestedNameSpecifierLoc(), |
1155 | ConceptName, CD, |
1156 | TypeConstr->LAngleLoc.isValid() ? &TemplateArgs : nullptr, |
1157 | ConstrainedParameter, EllipsisLoc); |
1158 | } |
1159 | |
1160 | template<typename ArgumentLocAppender> |
1161 | static ExprResult formImmediatelyDeclaredConstraint( |
1162 | Sema &S, NestedNameSpecifierLoc NS, DeclarationNameInfo NameInfo, |
1163 | ConceptDecl *NamedConcept, SourceLocation LAngleLoc, |
1164 | SourceLocation RAngleLoc, QualType ConstrainedType, |
1165 | SourceLocation ParamNameLoc, ArgumentLocAppender Appender, |
1166 | SourceLocation EllipsisLoc) { |
1167 | |
1168 | TemplateArgumentListInfo ConstraintArgs; |
1169 | ConstraintArgs.addArgument( |
1170 | S.getTrivialTemplateArgumentLoc(TemplateArgument(ConstrainedType), |
1171 | /*NTTPType=*/QualType(), ParamNameLoc)); |
1172 | |
1173 | ConstraintArgs.setRAngleLoc(RAngleLoc); |
1174 | ConstraintArgs.setLAngleLoc(LAngleLoc); |
1175 | Appender(ConstraintArgs); |
1176 | |
1177 | // C++2a [temp.param]p4: |
1178 | // [...] This constraint-expression E is called the immediately-declared |
1179 | // constraint of T. [...] |
1180 | CXXScopeSpec SS; |
1181 | SS.Adopt(NS); |
1182 | ExprResult ImmediatelyDeclaredConstraint = S.CheckConceptTemplateId( |
1183 | SS, /*TemplateKWLoc=*/SourceLocation(), NameInfo, |
1184 | /*FoundDecl=*/NamedConcept, NamedConcept, &ConstraintArgs); |
1185 | if (ImmediatelyDeclaredConstraint.isInvalid() || !EllipsisLoc.isValid()) |
1186 | return ImmediatelyDeclaredConstraint; |
1187 | |
1188 | // C++2a [temp.param]p4: |
1189 | // [...] If T is not a pack, then E is E', otherwise E is (E' && ...). |
1190 | // |
1191 | // We have the following case: |
1192 | // |
1193 | // template<typename T> concept C1 = true; |
1194 | // template<C1... T> struct s1; |
1195 | // |
1196 | // The constraint: (C1<T> && ...) |
1197 | // |
1198 | // Note that the type of C1<T> is known to be 'bool', so we don't need to do |
1199 | // any unqualified lookups for 'operator&&' here. |
1200 | return S.BuildCXXFoldExpr(/*UnqualifiedLookup=*/nullptr, |
1201 | /*LParenLoc=*/SourceLocation(), |
1202 | ImmediatelyDeclaredConstraint.get(), BO_LAnd, |
1203 | EllipsisLoc, /*RHS=*/nullptr, |
1204 | /*RParenLoc=*/SourceLocation(), |
1205 | /*NumExpansions=*/None); |
1206 | } |
1207 | |
1208 | /// Attach a type-constraint to a template parameter. |
1209 | /// \returns true if an error occured. This can happen if the |
1210 | /// immediately-declared constraint could not be formed (e.g. incorrect number |
1211 | /// of arguments for the named concept). |
1212 | bool Sema::AttachTypeConstraint(NestedNameSpecifierLoc NS, |
1213 | DeclarationNameInfo NameInfo, |
1214 | ConceptDecl *NamedConcept, |
1215 | const TemplateArgumentListInfo *TemplateArgs, |
1216 | TemplateTypeParmDecl *ConstrainedParameter, |
1217 | SourceLocation EllipsisLoc) { |
1218 | // C++2a [temp.param]p4: |
1219 | // [...] If Q is of the form C<A1, ..., An>, then let E' be |
1220 | // C<T, A1, ..., An>. Otherwise, let E' be C<T>. [...] |
1221 | const ASTTemplateArgumentListInfo *ArgsAsWritten = |
1222 | TemplateArgs ? ASTTemplateArgumentListInfo::Create(Context, |
1223 | *TemplateArgs) : nullptr; |
1224 | |
1225 | QualType ParamAsArgument(ConstrainedParameter->getTypeForDecl(), 0); |
1226 | |
1227 | ExprResult ImmediatelyDeclaredConstraint = |
1228 | formImmediatelyDeclaredConstraint( |
1229 | *this, NS, NameInfo, NamedConcept, |
1230 | TemplateArgs ? TemplateArgs->getLAngleLoc() : SourceLocation(), |
1231 | TemplateArgs ? TemplateArgs->getRAngleLoc() : SourceLocation(), |
1232 | ParamAsArgument, ConstrainedParameter->getLocation(), |
1233 | [&] (TemplateArgumentListInfo &ConstraintArgs) { |
1234 | if (TemplateArgs) |
1235 | for (const auto &ArgLoc : TemplateArgs->arguments()) |
1236 | ConstraintArgs.addArgument(ArgLoc); |
1237 | }, EllipsisLoc); |
1238 | if (ImmediatelyDeclaredConstraint.isInvalid()) |
1239 | return true; |
1240 | |
1241 | ConstrainedParameter->setTypeConstraint(NS, NameInfo, |
1242 | /*FoundDecl=*/NamedConcept, |
1243 | NamedConcept, ArgsAsWritten, |
1244 | ImmediatelyDeclaredConstraint.get()); |
1245 | return false; |
1246 | } |
1247 | |
1248 | bool Sema::AttachTypeConstraint(AutoTypeLoc TL, NonTypeTemplateParmDecl *NTTP, |
1249 | SourceLocation EllipsisLoc) { |
1250 | if (NTTP->getType() != TL.getType() || |
1251 | TL.getAutoKeyword() != AutoTypeKeyword::Auto) { |
1252 | Diag(NTTP->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), |
1253 | diag::err_unsupported_placeholder_constraint) |
1254 | << NTTP->getTypeSourceInfo()->getTypeLoc().getSourceRange(); |
1255 | return true; |
1256 | } |
1257 | // FIXME: Concepts: This should be the type of the placeholder, but this is |
1258 | // unclear in the wording right now. |
1259 | DeclRefExpr *Ref = |
1260 | BuildDeclRefExpr(NTTP, NTTP->getType(), VK_PRValue, NTTP->getLocation()); |
1261 | if (!Ref) |
1262 | return true; |
1263 | ExprResult ImmediatelyDeclaredConstraint = |
1264 | formImmediatelyDeclaredConstraint( |
1265 | *this, TL.getNestedNameSpecifierLoc(), TL.getConceptNameInfo(), |
1266 | TL.getNamedConcept(), TL.getLAngleLoc(), TL.getRAngleLoc(), |
1267 | BuildDecltypeType(Ref, NTTP->getLocation()), NTTP->getLocation(), |
1268 | [&] (TemplateArgumentListInfo &ConstraintArgs) { |
1269 | for (unsigned I = 0, C = TL.getNumArgs(); I != C; ++I) |
1270 | ConstraintArgs.addArgument(TL.getArgLoc(I)); |
1271 | }, EllipsisLoc); |
1272 | if (ImmediatelyDeclaredConstraint.isInvalid() || |
1273 | !ImmediatelyDeclaredConstraint.isUsable()) |
1274 | return true; |
1275 | |
1276 | NTTP->setPlaceholderTypeConstraint(ImmediatelyDeclaredConstraint.get()); |
1277 | return false; |
1278 | } |
1279 | |
1280 | /// Check that the type of a non-type template parameter is |
1281 | /// well-formed. |
1282 | /// |
1283 | /// \returns the (possibly-promoted) parameter type if valid; |
1284 | /// otherwise, produces a diagnostic and returns a NULL type. |
1285 | QualType Sema::CheckNonTypeTemplateParameterType(TypeSourceInfo *&TSI, |
1286 | SourceLocation Loc) { |
1287 | if (TSI->getType()->isUndeducedType()) { |
1288 | // C++17 [temp.dep.expr]p3: |
1289 | // An id-expression is type-dependent if it contains |
1290 | // - an identifier associated by name lookup with a non-type |
1291 | // template-parameter declared with a type that contains a |
1292 | // placeholder type (7.1.7.4), |
1293 | TSI = SubstAutoTypeSourceInfo(TSI, Context.DependentTy); |
1294 | } |
1295 | |
1296 | return CheckNonTypeTemplateParameterType(TSI->getType(), Loc); |
1297 | } |
1298 | |
1299 | /// Require the given type to be a structural type, and diagnose if it is not. |
1300 | /// |
1301 | /// \return \c true if an error was produced. |
1302 | bool Sema::RequireStructuralType(QualType T, SourceLocation Loc) { |
1303 | if (T->isDependentType()) |
1304 | return false; |
1305 | |
1306 | if (RequireCompleteType(Loc, T, diag::err_template_nontype_parm_incomplete)) |
1307 | return true; |
1308 | |
1309 | if (T->isStructuralType()) |
1310 | return false; |
1311 | |
1312 | // Structural types are required to be object types or lvalue references. |
1313 | if (T->isRValueReferenceType()) { |
1314 | Diag(Loc, diag::err_template_nontype_parm_rvalue_ref) << T; |
1315 | return true; |
1316 | } |
1317 | |
1318 | // Don't mention structural types in our diagnostic prior to C++20. Also, |
1319 | // there's not much more we can say about non-scalar non-class types -- |
1320 | // because we can't see functions or arrays here, those can only be language |
1321 | // extensions. |
1322 | if (!getLangOpts().CPlusPlus20 || |
1323 | (!T->isScalarType() && !T->isRecordType())) { |
1324 | Diag(Loc, diag::err_template_nontype_parm_bad_type) << T; |
1325 | return true; |
1326 | } |
1327 | |
1328 | // Structural types are required to be literal types. |
1329 | if (RequireLiteralType(Loc, T, diag::err_template_nontype_parm_not_literal)) |
1330 | return true; |
1331 | |
1332 | Diag(Loc, diag::err_template_nontype_parm_not_structural) << T; |
1333 | |
1334 | // Drill down into the reason why the class is non-structural. |
1335 | while (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) { |
1336 | // All members are required to be public and non-mutable, and can't be of |
1337 | // rvalue reference type. Check these conditions first to prefer a "local" |
1338 | // reason over a more distant one. |
1339 | for (const FieldDecl *FD : RD->fields()) { |
1340 | if (FD->getAccess() != AS_public) { |
1341 | Diag(FD->getLocation(), diag::note_not_structural_non_public) << T << 0; |
1342 | return true; |
1343 | } |
1344 | if (FD->isMutable()) { |
1345 | Diag(FD->getLocation(), diag::note_not_structural_mutable_field) << T; |
1346 | return true; |
1347 | } |
1348 | if (FD->getType()->isRValueReferenceType()) { |
1349 | Diag(FD->getLocation(), diag::note_not_structural_rvalue_ref_field) |
1350 | << T; |
1351 | return true; |
1352 | } |
1353 | } |
1354 | |
1355 | // All bases are required to be public. |
1356 | for (const auto &BaseSpec : RD->bases()) { |
1357 | if (BaseSpec.getAccessSpecifier() != AS_public) { |
1358 | Diag(BaseSpec.getBaseTypeLoc(), diag::note_not_structural_non_public) |
1359 | << T << 1; |
1360 | return true; |
1361 | } |
1362 | } |
1363 | |
1364 | // All subobjects are required to be of structural types. |
1365 | SourceLocation SubLoc; |
1366 | QualType SubType; |
1367 | int Kind = -1; |
1368 | |
1369 | for (const FieldDecl *FD : RD->fields()) { |
1370 | QualType T = Context.getBaseElementType(FD->getType()); |
1371 | if (!T->isStructuralType()) { |
1372 | SubLoc = FD->getLocation(); |
1373 | SubType = T; |
1374 | Kind = 0; |
1375 | break; |
1376 | } |
1377 | } |
1378 | |
1379 | if (Kind == -1) { |
1380 | for (const auto &BaseSpec : RD->bases()) { |
1381 | QualType T = BaseSpec.getType(); |
1382 | if (!T->isStructuralType()) { |
1383 | SubLoc = BaseSpec.getBaseTypeLoc(); |
1384 | SubType = T; |
1385 | Kind = 1; |
1386 | break; |
1387 | } |
1388 | } |
1389 | } |
1390 | |
1391 | assert(Kind != -1 && "couldn't find reason why type is not structural")((void)0); |
1392 | Diag(SubLoc, diag::note_not_structural_subobject) |
1393 | << T << Kind << SubType; |
1394 | T = SubType; |
1395 | RD = T->getAsCXXRecordDecl(); |
Value stored to 'RD' is never read | |
1396 | } |
1397 | |
1398 | return true; |
1399 | } |
1400 | |
1401 | QualType Sema::CheckNonTypeTemplateParameterType(QualType T, |
1402 | SourceLocation Loc) { |
1403 | // We don't allow variably-modified types as the type of non-type template |
1404 | // parameters. |
1405 | if (T->isVariablyModifiedType()) { |
1406 | Diag(Loc, diag::err_variably_modified_nontype_template_param) |
1407 | << T; |
1408 | return QualType(); |
1409 | } |
1410 | |
1411 | // C++ [temp.param]p4: |
1412 | // |
1413 | // A non-type template-parameter shall have one of the following |
1414 | // (optionally cv-qualified) types: |
1415 | // |
1416 | // -- integral or enumeration type, |
1417 | if (T->isIntegralOrEnumerationType() || |
1418 | // -- pointer to object or pointer to function, |
1419 | T->isPointerType() || |
1420 | // -- lvalue reference to object or lvalue reference to function, |
1421 | T->isLValueReferenceType() || |
1422 | // -- pointer to member, |
1423 | T->isMemberPointerType() || |
1424 | // -- std::nullptr_t, or |
1425 | T->isNullPtrType() || |
1426 | // -- a type that contains a placeholder type. |
1427 | T->isUndeducedType()) { |
1428 | // C++ [temp.param]p5: The top-level cv-qualifiers on the template-parameter |
1429 | // are ignored when determining its type. |
1430 | return T.getUnqualifiedType(); |
1431 | } |
1432 | |
1433 | // C++ [temp.param]p8: |
1434 | // |
1435 | // A non-type template-parameter of type "array of T" or |
1436 | // "function returning T" is adjusted to be of type "pointer to |
1437 | // T" or "pointer to function returning T", respectively. |
1438 | if (T->isArrayType() || T->isFunctionType()) |
1439 | return Context.getDecayedType(T); |
1440 | |
1441 | // If T is a dependent type, we can't do the check now, so we |
1442 | // assume that it is well-formed. Note that stripping off the |
1443 | // qualifiers here is not really correct if T turns out to be |
1444 | // an array type, but we'll recompute the type everywhere it's |
1445 | // used during instantiation, so that should be OK. (Using the |
1446 | // qualified type is equally wrong.) |
1447 | if (T->isDependentType()) |
1448 | return T.getUnqualifiedType(); |
1449 | |
1450 | // C++20 [temp.param]p6: |
1451 | // -- a structural type |
1452 | if (RequireStructuralType(T, Loc)) |
1453 | return QualType(); |
1454 | |
1455 | if (!getLangOpts().CPlusPlus20) { |
1456 | // FIXME: Consider allowing structural types as an extension in C++17. (In |
1457 | // earlier language modes, the template argument evaluation rules are too |
1458 | // inflexible.) |
1459 | Diag(Loc, diag::err_template_nontype_parm_bad_structural_type) << T; |
1460 | return QualType(); |
1461 | } |
1462 | |
1463 | Diag(Loc, diag::warn_cxx17_compat_template_nontype_parm_type) << T; |
1464 | return T.getUnqualifiedType(); |
1465 | } |
1466 | |
1467 | NamedDecl *Sema::ActOnNonTypeTemplateParameter(Scope *S, Declarator &D, |
1468 | unsigned Depth, |
1469 | unsigned Position, |
1470 | SourceLocation EqualLoc, |
1471 | Expr *Default) { |
1472 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); |
1473 | |
1474 | // Check that we have valid decl-specifiers specified. |
1475 | auto CheckValidDeclSpecifiers = [this, &D] { |
1476 | // C++ [temp.param] |
1477 | // p1 |
1478 | // template-parameter: |
1479 | // ... |
1480 | // parameter-declaration |
1481 | // p2 |
1482 | // ... A storage class shall not be specified in a template-parameter |
1483 | // declaration. |
1484 | // [dcl.typedef]p1: |
1485 | // The typedef specifier [...] shall not be used in the decl-specifier-seq |
1486 | // of a parameter-declaration |
1487 | const DeclSpec &DS = D.getDeclSpec(); |
1488 | auto EmitDiag = [this](SourceLocation Loc) { |
1489 | Diag(Loc, diag::err_invalid_decl_specifier_in_nontype_parm) |
1490 | << FixItHint::CreateRemoval(Loc); |
1491 | }; |
1492 | if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) |
1493 | EmitDiag(DS.getStorageClassSpecLoc()); |
1494 | |
1495 | if (DS.getThreadStorageClassSpec() != TSCS_unspecified) |
1496 | EmitDiag(DS.getThreadStorageClassSpecLoc()); |
1497 | |
1498 | // [dcl.inline]p1: |
1499 | // The inline specifier can be applied only to the declaration or |
1500 | // definition of a variable or function. |
1501 | |
1502 | if (DS.isInlineSpecified()) |
1503 | EmitDiag(DS.getInlineSpecLoc()); |
1504 | |
1505 | // [dcl.constexpr]p1: |
1506 | // The constexpr specifier shall be applied only to the definition of a |
1507 | // variable or variable template or the declaration of a function or |
1508 | // function template. |
1509 | |
1510 | if (DS.hasConstexprSpecifier()) |
1511 | EmitDiag(DS.getConstexprSpecLoc()); |
1512 | |
1513 | // [dcl.fct.spec]p1: |
1514 | // Function-specifiers can be used only in function declarations. |
1515 | |
1516 | if (DS.isVirtualSpecified()) |
1517 | EmitDiag(DS.getVirtualSpecLoc()); |
1518 | |
1519 | if (DS.hasExplicitSpecifier()) |
1520 | EmitDiag(DS.getExplicitSpecLoc()); |
1521 | |
1522 | if (DS.isNoreturnSpecified()) |
1523 | EmitDiag(DS.getNoreturnSpecLoc()); |
1524 | }; |
1525 | |
1526 | CheckValidDeclSpecifiers(); |
1527 | |
1528 | if (TInfo->getType()->isUndeducedType()) { |
1529 | Diag(D.getIdentifierLoc(), |
1530 | diag::warn_cxx14_compat_template_nontype_parm_auto_type) |
1531 | << QualType(TInfo->getType()->getContainedAutoType(), 0); |
1532 | } |
1533 | |
1534 | assert(S->isTemplateParamScope() &&((void)0) |
1535 | "Non-type template parameter not in template parameter scope!")((void)0); |
1536 | bool Invalid = false; |
1537 | |
1538 | QualType T = CheckNonTypeTemplateParameterType(TInfo, D.getIdentifierLoc()); |
1539 | if (T.isNull()) { |
1540 | T = Context.IntTy; // Recover with an 'int' type. |
1541 | Invalid = true; |
1542 | } |
1543 | |
1544 | CheckFunctionOrTemplateParamDeclarator(S, D); |
1545 | |
1546 | IdentifierInfo *ParamName = D.getIdentifier(); |
1547 | bool IsParameterPack = D.hasEllipsis(); |
1548 | NonTypeTemplateParmDecl *Param = NonTypeTemplateParmDecl::Create( |
1549 | Context, Context.getTranslationUnitDecl(), D.getBeginLoc(), |
1550 | D.getIdentifierLoc(), Depth, Position, ParamName, T, IsParameterPack, |
1551 | TInfo); |
1552 | Param->setAccess(AS_public); |
1553 | |
1554 | if (AutoTypeLoc TL = TInfo->getTypeLoc().getContainedAutoTypeLoc()) |
1555 | if (TL.isConstrained()) |
1556 | if (AttachTypeConstraint(TL, Param, D.getEllipsisLoc())) |
1557 | Invalid = true; |
1558 | |
1559 | if (Invalid) |
1560 | Param->setInvalidDecl(); |
1561 | |
1562 | if (Param->isParameterPack()) |
1563 | if (auto *LSI = getEnclosingLambda()) |
1564 | LSI->LocalPacks.push_back(Param); |
1565 | |
1566 | if (ParamName) { |
1567 | maybeDiagnoseTemplateParameterShadow(*this, S, D.getIdentifierLoc(), |
1568 | ParamName); |
1569 | |
1570 | // Add the template parameter into the current scope. |
1571 | S->AddDecl(Param); |
1572 | IdResolver.AddDecl(Param); |
1573 | } |
1574 | |
1575 | // C++0x [temp.param]p9: |
1576 | // A default template-argument may be specified for any kind of |
1577 | // template-parameter that is not a template parameter pack. |
1578 | if (Default && IsParameterPack) { |
1579 | Diag(EqualLoc, diag::err_template_param_pack_default_arg); |
1580 | Default = nullptr; |
1581 | } |
1582 | |
1583 | // Check the well-formedness of the default template argument, if provided. |
1584 | if (Default) { |
1585 | // Check for unexpanded parameter packs. |
1586 | if (DiagnoseUnexpandedParameterPack(Default, UPPC_DefaultArgument)) |
1587 | return Param; |
1588 | |
1589 | TemplateArgument Converted; |
1590 | ExprResult DefaultRes = |
1591 | CheckTemplateArgument(Param, Param->getType(), Default, Converted); |
1592 | if (DefaultRes.isInvalid()) { |
1593 | Param->setInvalidDecl(); |
1594 | return Param; |
1595 | } |
1596 | Default = DefaultRes.get(); |
1597 | |
1598 | Param->setDefaultArgument(Default); |
1599 | } |
1600 | |
1601 | return Param; |
1602 | } |
1603 | |
1604 | /// ActOnTemplateTemplateParameter - Called when a C++ template template |
1605 | /// parameter (e.g. T in template <template \<typename> class T> class array) |
1606 | /// has been parsed. S is the current scope. |
1607 | NamedDecl *Sema::ActOnTemplateTemplateParameter(Scope* S, |
1608 | SourceLocation TmpLoc, |
1609 | TemplateParameterList *Params, |
1610 | SourceLocation EllipsisLoc, |
1611 | IdentifierInfo *Name, |
1612 | SourceLocation NameLoc, |
1613 | unsigned Depth, |
1614 | unsigned Position, |
1615 | SourceLocation EqualLoc, |
1616 | ParsedTemplateArgument Default) { |
1617 | assert(S->isTemplateParamScope() &&((void)0) |
1618 | "Template template parameter not in template parameter scope!")((void)0); |
1619 | |
1620 | // Construct the parameter object. |
1621 | bool IsParameterPack = EllipsisLoc.isValid(); |
1622 | TemplateTemplateParmDecl *Param = |
1623 | TemplateTemplateParmDecl::Create(Context, Context.getTranslationUnitDecl(), |
1624 | NameLoc.isInvalid()? TmpLoc : NameLoc, |
1625 | Depth, Position, IsParameterPack, |
1626 | Name, Params); |
1627 | Param->setAccess(AS_public); |
1628 | |
1629 | if (Param->isParameterPack()) |
1630 | if (auto *LSI = getEnclosingLambda()) |
1631 | LSI->LocalPacks.push_back(Param); |
1632 | |
1633 | // If the template template parameter has a name, then link the identifier |
1634 | // into the scope and lookup mechanisms. |
1635 | if (Name) { |
1636 | maybeDiagnoseTemplateParameterShadow(*this, S, NameLoc, Name); |
1637 | |
1638 | S->AddDecl(Param); |
1639 | IdResolver.AddDecl(Param); |
1640 | } |
1641 | |
1642 | if (Params->size() == 0) { |
1643 | Diag(Param->getLocation(), diag::err_template_template_parm_no_parms) |
1644 | << SourceRange(Params->getLAngleLoc(), Params->getRAngleLoc()); |
1645 | Param->setInvalidDecl(); |
1646 | } |
1647 | |
1648 | // C++0x [temp.param]p9: |
1649 | // A default template-argument may be specified for any kind of |
1650 | // template-parameter that is not a template parameter pack. |
1651 | if (IsParameterPack && !Default.isInvalid()) { |
1652 | Diag(EqualLoc, diag::err_template_param_pack_default_arg); |
1653 | Default = ParsedTemplateArgument(); |
1654 | } |
1655 | |
1656 | if (!Default.isInvalid()) { |
1657 | // Check only that we have a template template argument. We don't want to |
1658 | // try to check well-formedness now, because our template template parameter |
1659 | // might have dependent types in its template parameters, which we wouldn't |
1660 | // be able to match now. |
1661 | // |
1662 | // If none of the template template parameter's template arguments mention |
1663 | // other template parameters, we could actually perform more checking here. |
1664 | // However, it isn't worth doing. |
1665 | TemplateArgumentLoc DefaultArg = translateTemplateArgument(*this, Default); |
1666 | if (DefaultArg.getArgument().getAsTemplate().isNull()) { |
1667 | Diag(DefaultArg.getLocation(), diag::err_template_arg_not_valid_template) |
1668 | << DefaultArg.getSourceRange(); |
1669 | return Param; |
1670 | } |
1671 | |
1672 | // Check for unexpanded parameter packs. |
1673 | if (DiagnoseUnexpandedParameterPack(DefaultArg.getLocation(), |
1674 | DefaultArg.getArgument().getAsTemplate(), |
1675 | UPPC_DefaultArgument)) |
1676 | return Param; |
1677 | |
1678 | Param->setDefaultArgument(Context, DefaultArg); |
1679 | } |
1680 | |
1681 | return Param; |
1682 | } |
1683 | |
1684 | /// ActOnTemplateParameterList - Builds a TemplateParameterList, optionally |
1685 | /// constrained by RequiresClause, that contains the template parameters in |
1686 | /// Params. |
1687 | TemplateParameterList * |
1688 | Sema::ActOnTemplateParameterList(unsigned Depth, |
1689 | SourceLocation ExportLoc, |
1690 | SourceLocation TemplateLoc, |
1691 | SourceLocation LAngleLoc, |
1692 | ArrayRef<NamedDecl *> Params, |
1693 | SourceLocation RAngleLoc, |
1694 | Expr *RequiresClause) { |
1695 | if (ExportLoc.isValid()) |
1696 | Diag(ExportLoc, diag::warn_template_export_unsupported); |
1697 | |
1698 | for (NamedDecl *P : Params) |
1699 | warnOnReservedIdentifier(P); |
1700 | |
1701 | return TemplateParameterList::Create( |
1702 | Context, TemplateLoc, LAngleLoc, |
1703 | llvm::makeArrayRef(Params.data(), Params.size()), |
1704 | RAngleLoc, RequiresClause); |
1705 | } |
1706 | |
1707 | static void SetNestedNameSpecifier(Sema &S, TagDecl *T, |
1708 | const CXXScopeSpec &SS) { |
1709 | if (SS.isSet()) |
1710 | T->setQualifierInfo(SS.getWithLocInContext(S.Context)); |
1711 | } |
1712 | |
1713 | DeclResult Sema::CheckClassTemplate( |
1714 | Scope *S, unsigned TagSpec, TagUseKind TUK, SourceLocation KWLoc, |
1715 | CXXScopeSpec &SS, IdentifierInfo *Name, SourceLocation NameLoc, |
1716 | const ParsedAttributesView &Attr, TemplateParameterList *TemplateParams, |
1717 | AccessSpecifier AS, SourceLocation ModulePrivateLoc, |
1718 | SourceLocation FriendLoc, unsigned NumOuterTemplateParamLists, |
1719 | TemplateParameterList **OuterTemplateParamLists, SkipBodyInfo *SkipBody) { |
1720 | assert(TemplateParams && TemplateParams->size() > 0 &&((void)0) |
1721 | "No template parameters")((void)0); |
1722 | assert(TUK != TUK_Reference && "Can only declare or define class templates")((void)0); |
1723 | bool Invalid = false; |
1724 | |
1725 | // Check that we can declare a template here. |
1726 | if (CheckTemplateDeclScope(S, TemplateParams)) |
1727 | return true; |
1728 | |
1729 | TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); |
1730 | assert(Kind != TTK_Enum && "can't build template of enumerated type")((void)0); |
1731 | |
1732 | // There is no such thing as an unnamed class template. |
1733 | if (!Name) { |
1734 | Diag(KWLoc, diag::err_template_unnamed_class); |
1735 | return true; |
1736 | } |
1737 | |
1738 | // Find any previous declaration with this name. For a friend with no |
1739 | // scope explicitly specified, we only look for tag declarations (per |
1740 | // C++11 [basic.lookup.elab]p2). |
1741 | DeclContext *SemanticContext; |
1742 | LookupResult Previous(*this, Name, NameLoc, |
1743 | (SS.isEmpty() && TUK == TUK_Friend) |
1744 | ? LookupTagName : LookupOrdinaryName, |
1745 | forRedeclarationInCurContext()); |
1746 | if (SS.isNotEmpty() && !SS.isInvalid()) { |
1747 | SemanticContext = computeDeclContext(SS, true); |
1748 | if (!SemanticContext) { |
1749 | // FIXME: Horrible, horrible hack! We can't currently represent this |
1750 | // in the AST, and historically we have just ignored such friend |
1751 | // class templates, so don't complain here. |
1752 | Diag(NameLoc, TUK == TUK_Friend |
1753 | ? diag::warn_template_qualified_friend_ignored |
1754 | : diag::err_template_qualified_declarator_no_match) |
1755 | << SS.getScopeRep() << SS.getRange(); |
1756 | return TUK != TUK_Friend; |
1757 | } |
1758 | |
1759 | if (RequireCompleteDeclContext(SS, SemanticContext)) |
1760 | return true; |
1761 | |
1762 | // If we're adding a template to a dependent context, we may need to |
1763 | // rebuilding some of the types used within the template parameter list, |
1764 | // now that we know what the current instantiation is. |
1765 | if (SemanticContext->isDependentContext()) { |
1766 | ContextRAII SavedContext(*this, SemanticContext); |
1767 | if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) |
1768 | Invalid = true; |
1769 | } else if (TUK != TUK_Friend && TUK != TUK_Reference) |
1770 | diagnoseQualifiedDeclaration(SS, SemanticContext, Name, NameLoc, false); |
1771 | |
1772 | LookupQualifiedName(Previous, SemanticContext); |
1773 | } else { |
1774 | SemanticContext = CurContext; |
1775 | |
1776 | // C++14 [class.mem]p14: |
1777 | // If T is the name of a class, then each of the following shall have a |
1778 | // name different from T: |
1779 | // -- every member template of class T |
1780 | if (TUK != TUK_Friend && |
1781 | DiagnoseClassNameShadow(SemanticContext, |
1782 | DeclarationNameInfo(Name, NameLoc))) |
1783 | return true; |
1784 | |
1785 | LookupName(Previous, S); |
1786 | } |
1787 | |
1788 | if (Previous.isAmbiguous()) |
1789 | return true; |
1790 | |
1791 | NamedDecl *PrevDecl = nullptr; |
1792 | if (Previous.begin() != Previous.end()) |
1793 | PrevDecl = (*Previous.begin())->getUnderlyingDecl(); |
1794 | |
1795 | if (PrevDecl && PrevDecl->isTemplateParameter()) { |
1796 | // Maybe we will complain about the shadowed template parameter. |
1797 | DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); |
1798 | // Just pretend that we didn't see the previous declaration. |
1799 | PrevDecl = nullptr; |
1800 | } |
1801 | |
1802 | // If there is a previous declaration with the same name, check |
1803 | // whether this is a valid redeclaration. |
1804 | ClassTemplateDecl *PrevClassTemplate = |
1805 | dyn_cast_or_null<ClassTemplateDecl>(PrevDecl); |
1806 | |
1807 | // We may have found the injected-class-name of a class template, |
1808 | // class template partial specialization, or class template specialization. |
1809 | // In these cases, grab the template that is being defined or specialized. |
1810 | if (!PrevClassTemplate && PrevDecl && isa<CXXRecordDecl>(PrevDecl) && |
1811 | cast<CXXRecordDecl>(PrevDecl)->isInjectedClassName()) { |
1812 | PrevDecl = cast<CXXRecordDecl>(PrevDecl->getDeclContext()); |
1813 | PrevClassTemplate |
1814 | = cast<CXXRecordDecl>(PrevDecl)->getDescribedClassTemplate(); |
1815 | if (!PrevClassTemplate && isa<ClassTemplateSpecializationDecl>(PrevDecl)) { |
1816 | PrevClassTemplate |
1817 | = cast<ClassTemplateSpecializationDecl>(PrevDecl) |
1818 | ->getSpecializedTemplate(); |
1819 | } |
1820 | } |
1821 | |
1822 | if (TUK == TUK_Friend) { |
1823 | // C++ [namespace.memdef]p3: |
1824 | // [...] When looking for a prior declaration of a class or a function |
1825 | // declared as a friend, and when the name of the friend class or |
1826 | // function is neither a qualified name nor a template-id, scopes outside |
1827 | // the innermost enclosing namespace scope are not considered. |
1828 | if (!SS.isSet()) { |
1829 | DeclContext *OutermostContext = CurContext; |
1830 | while (!OutermostContext->isFileContext()) |
1831 | OutermostContext = OutermostContext->getLookupParent(); |
1832 | |
1833 | if (PrevDecl && |
1834 | (OutermostContext->Equals(PrevDecl->getDeclContext()) || |
1835 | OutermostContext->Encloses(PrevDecl->getDeclContext()))) { |
1836 | SemanticContext = PrevDecl->getDeclContext(); |
1837 | } else { |
1838 | // Declarations in outer scopes don't matter. However, the outermost |
1839 | // context we computed is the semantic context for our new |
1840 | // declaration. |
1841 | PrevDecl = PrevClassTemplate = nullptr; |
1842 | SemanticContext = OutermostContext; |
1843 | |
1844 | // Check that the chosen semantic context doesn't already contain a |
1845 | // declaration of this name as a non-tag type. |
1846 | Previous.clear(LookupOrdinaryName); |
1847 | DeclContext *LookupContext = SemanticContext; |
1848 | while (LookupContext->isTransparentContext()) |
1849 | LookupContext = LookupContext->getLookupParent(); |
1850 | LookupQualifiedName(Previous, LookupContext); |
1851 | |
1852 | if (Previous.isAmbiguous()) |
1853 | return true; |
1854 | |
1855 | if (Previous.begin() != Previous.end()) |
1856 | PrevDecl = (*Previous.begin())->getUnderlyingDecl(); |
1857 | } |
1858 | } |
1859 | } else if (PrevDecl && |
1860 | !isDeclInScope(Previous.getRepresentativeDecl(), SemanticContext, |
1861 | S, SS.isValid())) |
1862 | PrevDecl = PrevClassTemplate = nullptr; |
1863 | |
1864 | if (auto *Shadow = dyn_cast_or_null<UsingShadowDecl>( |
1865 | PrevDecl ? Previous.getRepresentativeDecl() : nullptr)) { |
1866 | if (SS.isEmpty() && |
1867 | !(PrevClassTemplate && |
1868 | PrevClassTemplate->getDeclContext()->getRedeclContext()->Equals( |
1869 | SemanticContext->getRedeclContext()))) { |
1870 | Diag(KWLoc, diag::err_using_decl_conflict_reverse); |
1871 | Diag(Shadow->getTargetDecl()->getLocation(), |
1872 | diag::note_using_decl_target); |
1873 | Diag(Shadow->getIntroducer()->getLocation(), diag::note_using_decl) << 0; |
1874 | // Recover by ignoring the old declaration. |
1875 | PrevDecl = PrevClassTemplate = nullptr; |
1876 | } |
1877 | } |
1878 | |
1879 | if (PrevClassTemplate) { |
1880 | // Ensure that the template parameter lists are compatible. Skip this check |
1881 | // for a friend in a dependent context: the template parameter list itself |
1882 | // could be dependent. |
1883 | if (!(TUK == TUK_Friend && CurContext->isDependentContext()) && |
1884 | !TemplateParameterListsAreEqual(TemplateParams, |
1885 | PrevClassTemplate->getTemplateParameters(), |
1886 | /*Complain=*/true, |
1887 | TPL_TemplateMatch)) |
1888 | return true; |
1889 | |
1890 | // C++ [temp.class]p4: |
1891 | // In a redeclaration, partial specialization, explicit |
1892 | // specialization or explicit instantiation of a class template, |
1893 | // the class-key shall agree in kind with the original class |
1894 | // template declaration (7.1.5.3). |
1895 | RecordDecl *PrevRecordDecl = PrevClassTemplate->getTemplatedDecl(); |
1896 | if (!isAcceptableTagRedeclaration(PrevRecordDecl, Kind, |
1897 | TUK == TUK_Definition, KWLoc, Name)) { |
1898 | Diag(KWLoc, diag::err_use_with_wrong_tag) |
1899 | << Name |
1900 | << FixItHint::CreateReplacement(KWLoc, PrevRecordDecl->getKindName()); |
1901 | Diag(PrevRecordDecl->getLocation(), diag::note_previous_use); |
1902 | Kind = PrevRecordDecl->getTagKind(); |
1903 | } |
1904 | |
1905 | // Check for redefinition of this class template. |
1906 | if (TUK == TUK_Definition) { |
1907 | if (TagDecl *Def = PrevRecordDecl->getDefinition()) { |
1908 | // If we have a prior definition that is not visible, treat this as |
1909 | // simply making that previous definition visible. |
1910 | NamedDecl *Hidden = nullptr; |
1911 | if (SkipBody && !hasVisibleDefinition(Def, &Hidden)) { |
1912 | SkipBody->ShouldSkip = true; |
1913 | SkipBody->Previous = Def; |
1914 | auto *Tmpl = cast<CXXRecordDecl>(Hidden)->getDescribedClassTemplate(); |
1915 | assert(Tmpl && "original definition of a class template is not a "((void)0) |
1916 | "class template?")((void)0); |
1917 | makeMergedDefinitionVisible(Hidden); |
1918 | makeMergedDefinitionVisible(Tmpl); |
1919 | } else { |
1920 | Diag(NameLoc, diag::err_redefinition) << Name; |
1921 | Diag(Def->getLocation(), diag::note_previous_definition); |
1922 | // FIXME: Would it make sense to try to "forget" the previous |
1923 | // definition, as part of error recovery? |
1924 | return true; |
1925 | } |
1926 | } |
1927 | } |
1928 | } else if (PrevDecl) { |
1929 | // C++ [temp]p5: |
1930 | // A class template shall not have the same name as any other |
1931 | // template, class, function, object, enumeration, enumerator, |
1932 | // namespace, or type in the same scope (3.3), except as specified |
1933 | // in (14.5.4). |
1934 | Diag(NameLoc, diag::err_redefinition_different_kind) << Name; |
1935 | Diag(PrevDecl->getLocation(), diag::note_previous_definition); |
1936 | return true; |
1937 | } |
1938 | |
1939 | // Check the template parameter list of this declaration, possibly |
1940 | // merging in the template parameter list from the previous class |
1941 | // template declaration. Skip this check for a friend in a dependent |
1942 | // context, because the template parameter list might be dependent. |
1943 | if (!(TUK == TUK_Friend && CurContext->isDependentContext()) && |
1944 | CheckTemplateParameterList( |
1945 | TemplateParams, |
1946 | PrevClassTemplate |
1947 | ? PrevClassTemplate->getMostRecentDecl()->getTemplateParameters() |
1948 | : nullptr, |
1949 | (SS.isSet() && SemanticContext && SemanticContext->isRecord() && |
1950 | SemanticContext->isDependentContext()) |
1951 | ? TPC_ClassTemplateMember |
1952 | : TUK == TUK_Friend ? TPC_FriendClassTemplate : TPC_ClassTemplate, |
1953 | SkipBody)) |
1954 | Invalid = true; |
1955 | |
1956 | if (SS.isSet()) { |
1957 | // If the name of the template was qualified, we must be defining the |
1958 | // template out-of-line. |
1959 | if (!SS.isInvalid() && !Invalid && !PrevClassTemplate) { |
1960 | Diag(NameLoc, TUK == TUK_Friend ? diag::err_friend_decl_does_not_match |
1961 | : diag::err_member_decl_does_not_match) |
1962 | << Name << SemanticContext << /*IsDefinition*/true << SS.getRange(); |
1963 | Invalid = true; |
1964 | } |
1965 | } |
1966 | |
1967 | // If this is a templated friend in a dependent context we should not put it |
1968 | // on the redecl chain. In some cases, the templated friend can be the most |
1969 | // recent declaration tricking the template instantiator to make substitutions |
1970 | // there. |
1971 | // FIXME: Figure out how to combine with shouldLinkDependentDeclWithPrevious |
1972 | bool ShouldAddRedecl |
1973 | = !(TUK == TUK_Friend && CurContext->isDependentContext()); |
1974 | |
1975 | CXXRecordDecl *NewClass = |
1976 | CXXRecordDecl::Create(Context, Kind, SemanticContext, KWLoc, NameLoc, Name, |
1977 | PrevClassTemplate && ShouldAddRedecl ? |
1978 | PrevClassTemplate->getTemplatedDecl() : nullptr, |
1979 | /*DelayTypeCreation=*/true); |
1980 | SetNestedNameSpecifier(*this, NewClass, SS); |
1981 | if (NumOuterTemplateParamLists > 0) |
1982 | NewClass->setTemplateParameterListsInfo( |
1983 | Context, llvm::makeArrayRef(OuterTemplateParamLists, |
1984 | NumOuterTemplateParamLists)); |
1985 | |
1986 | // Add alignment attributes if necessary; these attributes are checked when |
1987 | // the ASTContext lays out the structure. |
1988 | if (TUK == TUK_Definition && (!SkipBody || !SkipBody->ShouldSkip)) { |
1989 | AddAlignmentAttributesForRecord(NewClass); |
1990 | AddMsStructLayoutForRecord(NewClass); |
1991 | } |
1992 | |
1993 | ClassTemplateDecl *NewTemplate |
1994 | = ClassTemplateDecl::Create(Context, SemanticContext, NameLoc, |
1995 | DeclarationName(Name), TemplateParams, |
1996 | NewClass); |
1997 | |
1998 | if (ShouldAddRedecl) |
1999 | NewTemplate->setPreviousDecl(PrevClassTemplate); |
2000 | |
2001 | NewClass->setDescribedClassTemplate(NewTemplate); |
2002 | |
2003 | if (ModulePrivateLoc.isValid()) |
2004 | NewTemplate->setModulePrivate(); |
2005 | |
2006 | // Build the type for the class template declaration now. |
2007 | QualType T = NewTemplate->getInjectedClassNameSpecialization(); |
2008 | T = Context.getInjectedClassNameType(NewClass, T); |
2009 | assert(T->isDependentType() && "Class template type is not dependent?")((void)0); |
2010 | (void)T; |
2011 | |
2012 | // If we are providing an explicit specialization of a member that is a |
2013 | // class template, make a note of that. |
2014 | if (PrevClassTemplate && |
2015 | PrevClassTemplate->getInstantiatedFromMemberTemplate()) |
2016 | PrevClassTemplate->setMemberSpecialization(); |
2017 | |
2018 | // Set the access specifier. |
2019 | if (!Invalid && TUK != TUK_Friend && NewTemplate->getDeclContext()->isRecord()) |
2020 | SetMemberAccessSpecifier(NewTemplate, PrevClassTemplate, AS); |
2021 | |
2022 | // Set the lexical context of these templates |
2023 | NewClass->setLexicalDeclContext(CurContext); |
2024 | NewTemplate->setLexicalDeclContext(CurContext); |
2025 | |
2026 | if (TUK == TUK_Definition && (!SkipBody || !SkipBody->ShouldSkip)) |
2027 | NewClass->startDefinition(); |
2028 | |
2029 | ProcessDeclAttributeList(S, NewClass, Attr); |
2030 | |
2031 | if (PrevClassTemplate) |
2032 | mergeDeclAttributes(NewClass, PrevClassTemplate->getTemplatedDecl()); |
2033 | |
2034 | AddPushedVisibilityAttribute(NewClass); |
2035 | inferGslOwnerPointerAttribute(NewClass); |
2036 | |
2037 | if (TUK != TUK_Friend) { |
2038 | // Per C++ [basic.scope.temp]p2, skip the template parameter scopes. |
2039 | Scope *Outer = S; |
2040 | while ((Outer->getFlags() & Scope::TemplateParamScope) != 0) |
2041 | Outer = Outer->getParent(); |
2042 | PushOnScopeChains(NewTemplate, Outer); |
2043 | } else { |
2044 | if (PrevClassTemplate && PrevClassTemplate->getAccess() != AS_none) { |
2045 | NewTemplate->setAccess(PrevClassTemplate->getAccess()); |
2046 | NewClass->setAccess(PrevClassTemplate->getAccess()); |
2047 | } |
2048 | |
2049 | NewTemplate->setObjectOfFriendDecl(); |
2050 | |
2051 | // Friend templates are visible in fairly strange ways. |
2052 | if (!CurContext->isDependentContext()) { |
2053 | DeclContext *DC = SemanticContext->getRedeclContext(); |
2054 | DC->makeDeclVisibleInContext(NewTemplate); |
2055 | if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) |
2056 | PushOnScopeChains(NewTemplate, EnclosingScope, |
2057 | /* AddToContext = */ false); |
2058 | } |
2059 | |
2060 | FriendDecl *Friend = FriendDecl::Create( |
2061 | Context, CurContext, NewClass->getLocation(), NewTemplate, FriendLoc); |
2062 | Friend->setAccess(AS_public); |
2063 | CurContext->addDecl(Friend); |
2064 | } |
2065 | |
2066 | if (PrevClassTemplate) |
2067 | CheckRedeclarationModuleOwnership(NewTemplate, PrevClassTemplate); |
2068 | |
2069 | if (Invalid) { |
2070 | NewTemplate->setInvalidDecl(); |
2071 | NewClass->setInvalidDecl(); |
2072 | } |
2073 | |
2074 | ActOnDocumentableDecl(NewTemplate); |
2075 | |
2076 | if (SkipBody && SkipBody->ShouldSkip) |
2077 | return SkipBody->Previous; |
2078 | |
2079 | return NewTemplate; |
2080 | } |
2081 | |
2082 | namespace { |
2083 | /// Tree transform to "extract" a transformed type from a class template's |
2084 | /// constructor to a deduction guide. |
2085 | class ExtractTypeForDeductionGuide |
2086 | : public TreeTransform<ExtractTypeForDeductionGuide> { |
2087 | llvm::SmallVectorImpl<TypedefNameDecl *> &MaterializedTypedefs; |
2088 | |
2089 | public: |
2090 | typedef TreeTransform<ExtractTypeForDeductionGuide> Base; |
2091 | ExtractTypeForDeductionGuide( |
2092 | Sema &SemaRef, |
2093 | llvm::SmallVectorImpl<TypedefNameDecl *> &MaterializedTypedefs) |
2094 | : Base(SemaRef), MaterializedTypedefs(MaterializedTypedefs) {} |
2095 | |
2096 | TypeSourceInfo *transform(TypeSourceInfo *TSI) { return TransformType(TSI); } |
2097 | |
2098 | QualType TransformTypedefType(TypeLocBuilder &TLB, TypedefTypeLoc TL) { |
2099 | ASTContext &Context = SemaRef.getASTContext(); |
2100 | TypedefNameDecl *OrigDecl = TL.getTypedefNameDecl(); |
2101 | TypedefNameDecl *Decl = OrigDecl; |
2102 | // Transform the underlying type of the typedef and clone the Decl only if |
2103 | // the typedef has a dependent context. |
2104 | if (OrigDecl->getDeclContext()->isDependentContext()) { |
2105 | TypeLocBuilder InnerTLB; |
2106 | QualType Transformed = |
2107 | TransformType(InnerTLB, OrigDecl->getTypeSourceInfo()->getTypeLoc()); |
2108 | TypeSourceInfo *TSI = InnerTLB.getTypeSourceInfo(Context, Transformed); |
2109 | if (isa<TypeAliasDecl>(OrigDecl)) |
2110 | Decl = TypeAliasDecl::Create( |
2111 | Context, Context.getTranslationUnitDecl(), OrigDecl->getBeginLoc(), |
2112 | OrigDecl->getLocation(), OrigDecl->getIdentifier(), TSI); |
2113 | else { |
2114 | assert(isa<TypedefDecl>(OrigDecl) && "Not a Type alias or typedef")((void)0); |
2115 | Decl = TypedefDecl::Create( |
2116 | Context, Context.getTranslationUnitDecl(), OrigDecl->getBeginLoc(), |
2117 | OrigDecl->getLocation(), OrigDecl->getIdentifier(), TSI); |
2118 | } |
2119 | MaterializedTypedefs.push_back(Decl); |
2120 | } |
2121 | |
2122 | QualType TDTy = Context.getTypedefType(Decl); |
2123 | TypedefTypeLoc TypedefTL = TLB.push<TypedefTypeLoc>(TDTy); |
2124 | TypedefTL.setNameLoc(TL.getNameLoc()); |
2125 | |
2126 | return TDTy; |
2127 | } |
2128 | }; |
2129 | |
2130 | /// Transform to convert portions of a constructor declaration into the |
2131 | /// corresponding deduction guide, per C++1z [over.match.class.deduct]p1. |
2132 | struct ConvertConstructorToDeductionGuideTransform { |
2133 | ConvertConstructorToDeductionGuideTransform(Sema &S, |
2134 | ClassTemplateDecl *Template) |
2135 | : SemaRef(S), Template(Template) {} |
2136 | |
2137 | Sema &SemaRef; |
2138 | ClassTemplateDecl *Template; |
2139 | |
2140 | DeclContext *DC = Template->getDeclContext(); |
2141 | CXXRecordDecl *Primary = Template->getTemplatedDecl(); |
2142 | DeclarationName DeductionGuideName = |
2143 | SemaRef.Context.DeclarationNames.getCXXDeductionGuideName(Template); |
2144 | |
2145 | QualType DeducedType = SemaRef.Context.getTypeDeclType(Primary); |
2146 | |
2147 | // Index adjustment to apply to convert depth-1 template parameters into |
2148 | // depth-0 template parameters. |
2149 | unsigned Depth1IndexAdjustment = Template->getTemplateParameters()->size(); |
2150 | |
2151 | /// Transform a constructor declaration into a deduction guide. |
2152 | NamedDecl *transformConstructor(FunctionTemplateDecl *FTD, |
2153 | CXXConstructorDecl *CD) { |
2154 | SmallVector<TemplateArgument, 16> SubstArgs; |
2155 | |
2156 | LocalInstantiationScope Scope(SemaRef); |
2157 | |
2158 | // C++ [over.match.class.deduct]p1: |
2159 | // -- For each constructor of the class template designated by the |
2160 | // template-name, a function template with the following properties: |
2161 | |
2162 | // -- The template parameters are the template parameters of the class |
2163 | // template followed by the template parameters (including default |
2164 | // template arguments) of the constructor, if any. |
2165 | TemplateParameterList *TemplateParams = Template->getTemplateParameters(); |
2166 | if (FTD) { |
2167 | TemplateParameterList *InnerParams = FTD->getTemplateParameters(); |
2168 | SmallVector<NamedDecl *, 16> AllParams; |
2169 | AllParams.reserve(TemplateParams->size() + InnerParams->size()); |
2170 | AllParams.insert(AllParams.begin(), |
2171 | TemplateParams->begin(), TemplateParams->end()); |
2172 | SubstArgs.reserve(InnerParams->size()); |
2173 | |
2174 | // Later template parameters could refer to earlier ones, so build up |
2175 | // a list of substituted template arguments as we go. |
2176 | for (NamedDecl *Param : *InnerParams) { |
2177 | MultiLevelTemplateArgumentList Args; |
2178 | Args.setKind(TemplateSubstitutionKind::Rewrite); |
2179 | Args.addOuterTemplateArguments(SubstArgs); |
2180 | Args.addOuterRetainedLevel(); |
2181 | NamedDecl *NewParam = transformTemplateParameter(Param, Args); |
2182 | if (!NewParam) |
2183 | return nullptr; |
2184 | AllParams.push_back(NewParam); |
2185 | SubstArgs.push_back(SemaRef.Context.getCanonicalTemplateArgument( |
2186 | SemaRef.Context.getInjectedTemplateArg(NewParam))); |
2187 | } |
2188 | TemplateParams = TemplateParameterList::Create( |
2189 | SemaRef.Context, InnerParams->getTemplateLoc(), |
2190 | InnerParams->getLAngleLoc(), AllParams, InnerParams->getRAngleLoc(), |
2191 | /*FIXME: RequiresClause*/ nullptr); |
2192 | } |
2193 | |
2194 | // If we built a new template-parameter-list, track that we need to |
2195 | // substitute references to the old parameters into references to the |
2196 | // new ones. |
2197 | MultiLevelTemplateArgumentList Args; |
2198 | Args.setKind(TemplateSubstitutionKind::Rewrite); |
2199 | if (FTD) { |
2200 | Args.addOuterTemplateArguments(SubstArgs); |
2201 | Args.addOuterRetainedLevel(); |
2202 | } |
2203 | |
2204 | FunctionProtoTypeLoc FPTL = CD->getTypeSourceInfo()->getTypeLoc() |
2205 | .getAsAdjusted<FunctionProtoTypeLoc>(); |
2206 | assert(FPTL && "no prototype for constructor declaration")((void)0); |
2207 | |
2208 | // Transform the type of the function, adjusting the return type and |
2209 | // replacing references to the old parameters with references to the |
2210 | // new ones. |
2211 | TypeLocBuilder TLB; |
2212 | SmallVector<ParmVarDecl*, 8> Params; |
2213 | SmallVector<TypedefNameDecl *, 4> MaterializedTypedefs; |
2214 | QualType NewType = transformFunctionProtoType(TLB, FPTL, Params, Args, |
2215 | MaterializedTypedefs); |
2216 | if (NewType.isNull()) |
2217 | return nullptr; |
2218 | TypeSourceInfo *NewTInfo = TLB.getTypeSourceInfo(SemaRef.Context, NewType); |
2219 | |
2220 | return buildDeductionGuide(TemplateParams, CD, CD->getExplicitSpecifier(), |
2221 | NewTInfo, CD->getBeginLoc(), CD->getLocation(), |
2222 | CD->getEndLoc(), MaterializedTypedefs); |
2223 | } |
2224 | |
2225 | /// Build a deduction guide with the specified parameter types. |
2226 | NamedDecl *buildSimpleDeductionGuide(MutableArrayRef<QualType> ParamTypes) { |
2227 | SourceLocation Loc = Template->getLocation(); |
2228 | |
2229 | // Build the requested type. |
2230 | FunctionProtoType::ExtProtoInfo EPI; |
2231 | EPI.HasTrailingReturn = true; |
2232 | QualType Result = SemaRef.BuildFunctionType(DeducedType, ParamTypes, Loc, |
2233 | DeductionGuideName, EPI); |
2234 | TypeSourceInfo *TSI = SemaRef.Context.getTrivialTypeSourceInfo(Result, Loc); |
2235 | |
2236 | FunctionProtoTypeLoc FPTL = |
2237 | TSI->getTypeLoc().castAs<FunctionProtoTypeLoc>(); |
2238 | |
2239 | // Build the parameters, needed during deduction / substitution. |
2240 | SmallVector<ParmVarDecl*, 4> Params; |
2241 | for (auto T : ParamTypes) { |
2242 | ParmVarDecl *NewParam = ParmVarDecl::Create( |
2243 | SemaRef.Context, DC, Loc, Loc, nullptr, T, |
2244 | SemaRef.Context.getTrivialTypeSourceInfo(T, Loc), SC_None, nullptr); |
2245 | NewParam->setScopeInfo(0, Params.size()); |
2246 | FPTL.setParam(Params.size(), NewParam); |
2247 | Params.push_back(NewParam); |
2248 | } |
2249 | |
2250 | return buildDeductionGuide(Template->getTemplateParameters(), nullptr, |
2251 | ExplicitSpecifier(), TSI, Loc, Loc, Loc); |
2252 | } |
2253 | |
2254 | private: |
2255 | /// Transform a constructor template parameter into a deduction guide template |
2256 | /// parameter, rebuilding any internal references to earlier parameters and |
2257 | /// renumbering as we go. |
2258 | NamedDecl *transformTemplateParameter(NamedDecl *TemplateParam, |
2259 | MultiLevelTemplateArgumentList &Args) { |
2260 | if (auto *TTP = dyn_cast<TemplateTypeParmDecl>(TemplateParam)) { |
2261 | // TemplateTypeParmDecl's index cannot be changed after creation, so |
2262 | // substitute it directly. |
2263 | auto *NewTTP = TemplateTypeParmDecl::Create( |
2264 | SemaRef.Context, DC, TTP->getBeginLoc(), TTP->getLocation(), |
2265 | /*Depth*/ 0, Depth1IndexAdjustment + TTP->getIndex(), |
2266 | TTP->getIdentifier(), TTP->wasDeclaredWithTypename(), |
2267 | TTP->isParameterPack(), TTP->hasTypeConstraint(), |
2268 | TTP->isExpandedParameterPack() ? |
2269 | llvm::Optional<unsigned>(TTP->getNumExpansionParameters()) : None); |
2270 | if (const auto *TC = TTP->getTypeConstraint()) { |
2271 | TemplateArgumentListInfo TransformedArgs; |
2272 | const auto *ArgsAsWritten = TC->getTemplateArgsAsWritten(); |
2273 | if (!ArgsAsWritten || |
2274 | SemaRef.Subst(ArgsAsWritten->getTemplateArgs(), |
2275 | ArgsAsWritten->NumTemplateArgs, TransformedArgs, |
2276 | Args)) |
2277 | SemaRef.AttachTypeConstraint( |
2278 | TC->getNestedNameSpecifierLoc(), TC->getConceptNameInfo(), |
2279 | TC->getNamedConcept(), ArgsAsWritten ? &TransformedArgs : nullptr, |
2280 | NewTTP, |
2281 | NewTTP->isParameterPack() |
2282 | ? cast<CXXFoldExpr>(TC->getImmediatelyDeclaredConstraint()) |
2283 | ->getEllipsisLoc() |
2284 | : SourceLocation()); |
2285 | } |
2286 | if (TTP->hasDefaultArgument()) { |
2287 | TypeSourceInfo *InstantiatedDefaultArg = |
2288 | SemaRef.SubstType(TTP->getDefaultArgumentInfo(), Args, |
2289 | TTP->getDefaultArgumentLoc(), TTP->getDeclName()); |
2290 | if (InstantiatedDefaultArg) |
2291 | NewTTP->setDefaultArgument(InstantiatedDefaultArg); |
2292 | } |
2293 | SemaRef.CurrentInstantiationScope->InstantiatedLocal(TemplateParam, |
2294 | NewTTP); |
2295 | return NewTTP; |
2296 | } |
2297 | |
2298 | if (auto *TTP = dyn_cast<TemplateTemplateParmDecl>(TemplateParam)) |
2299 | return transformTemplateParameterImpl(TTP, Args); |
2300 | |
2301 | return transformTemplateParameterImpl( |
2302 | cast<NonTypeTemplateParmDecl>(TemplateParam), Args); |
2303 | } |
2304 | template<typename TemplateParmDecl> |
2305 | TemplateParmDecl * |
2306 | transformTemplateParameterImpl(TemplateParmDecl *OldParam, |
2307 | MultiLevelTemplateArgumentList &Args) { |
2308 | // Ask the template instantiator to do the heavy lifting for us, then adjust |
2309 | // the index of the parameter once it's done. |
2310 | auto *NewParam = |
2311 | cast<TemplateParmDecl>(SemaRef.SubstDecl(OldParam, DC, Args)); |
2312 | assert(NewParam->getDepth() == 0 && "unexpected template param depth")((void)0); |
2313 | NewParam->setPosition(NewParam->getPosition() + Depth1IndexAdjustment); |
2314 | return NewParam; |
2315 | } |
2316 | |
2317 | QualType transformFunctionProtoType( |
2318 | TypeLocBuilder &TLB, FunctionProtoTypeLoc TL, |
2319 | SmallVectorImpl<ParmVarDecl *> &Params, |
2320 | MultiLevelTemplateArgumentList &Args, |
2321 | SmallVectorImpl<TypedefNameDecl *> &MaterializedTypedefs) { |
2322 | SmallVector<QualType, 4> ParamTypes; |
2323 | const FunctionProtoType *T = TL.getTypePtr(); |
2324 | |
2325 | // -- The types of the function parameters are those of the constructor. |
2326 | for (auto *OldParam : TL.getParams()) { |
2327 | ParmVarDecl *NewParam = |
2328 | transformFunctionTypeParam(OldParam, Args, MaterializedTypedefs); |
2329 | if (!NewParam) |
2330 | return QualType(); |
2331 | ParamTypes.push_back(NewParam->getType()); |
2332 | Params.push_back(NewParam); |
2333 | } |
2334 | |
2335 | // -- The return type is the class template specialization designated by |
2336 | // the template-name and template arguments corresponding to the |
2337 | // template parameters obtained from the class template. |
2338 | // |
2339 | // We use the injected-class-name type of the primary template instead. |
2340 | // This has the convenient property that it is different from any type that |
2341 | // the user can write in a deduction-guide (because they cannot enter the |
2342 | // context of the template), so implicit deduction guides can never collide |
2343 | // with explicit ones. |
2344 | QualType ReturnType = DeducedType; |
2345 | TLB.pushTypeSpec(ReturnType).setNameLoc(Primary->getLocation()); |
2346 | |
2347 | // Resolving a wording defect, we also inherit the variadicness of the |
2348 | // constructor. |
2349 | FunctionProtoType::ExtProtoInfo EPI; |
2350 | EPI.Variadic = T->isVariadic(); |
2351 | EPI.HasTrailingReturn = true; |
2352 | |
2353 | QualType Result = SemaRef.BuildFunctionType( |
2354 | ReturnType, ParamTypes, TL.getBeginLoc(), DeductionGuideName, EPI); |
2355 | if (Result.isNull()) |
2356 | return QualType(); |
2357 | |
2358 | FunctionProtoTypeLoc NewTL = TLB.push<FunctionProtoTypeLoc>(Result); |
2359 | NewTL.setLocalRangeBegin(TL.getLocalRangeBegin()); |
2360 | NewTL.setLParenLoc(TL.getLParenLoc()); |
2361 | NewTL.setRParenLoc(TL.getRParenLoc()); |
2362 | NewTL.setExceptionSpecRange(SourceRange()); |
2363 | NewTL.setLocalRangeEnd(TL.getLocalRangeEnd()); |
2364 | for (unsigned I = 0, E = NewTL.getNumParams(); I != E; ++I) |
2365 | NewTL.setParam(I, Params[I]); |
2366 | |
2367 | return Result; |
2368 | } |
2369 | |
2370 | ParmVarDecl *transformFunctionTypeParam( |
2371 | ParmVarDecl *OldParam, MultiLevelTemplateArgumentList &Args, |
2372 | llvm::SmallVectorImpl<TypedefNameDecl *> &MaterializedTypedefs) { |
2373 | TypeSourceInfo *OldDI = OldParam->getTypeSourceInfo(); |
2374 | TypeSourceInfo *NewDI; |
2375 | if (auto PackTL = OldDI->getTypeLoc().getAs<PackExpansionTypeLoc>()) { |
2376 | // Expand out the one and only element in each inner pack. |
2377 | Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, 0); |
2378 | NewDI = |
2379 | SemaRef.SubstType(PackTL.getPatternLoc(), Args, |
2380 | OldParam->getLocation(), OldParam->getDeclName()); |
2381 | if (!NewDI) return nullptr; |
2382 | NewDI = |
2383 | SemaRef.CheckPackExpansion(NewDI, PackTL.getEllipsisLoc(), |
2384 | PackTL.getTypePtr()->getNumExpansions()); |
2385 | } else |
2386 | NewDI = SemaRef.SubstType(OldDI, Args, OldParam->getLocation(), |
2387 | OldParam->getDeclName()); |
2388 | if (!NewDI) |
2389 | return nullptr; |
2390 | |
2391 | // Extract the type. This (for instance) replaces references to typedef |
2392 | // members of the current instantiations with the definitions of those |
2393 | // typedefs, avoiding triggering instantiation of the deduced type during |
2394 | // deduction. |
2395 | NewDI = ExtractTypeForDeductionGuide(SemaRef, MaterializedTypedefs) |
2396 | .transform(NewDI); |
2397 | |
2398 | // Resolving a wording defect, we also inherit default arguments from the |
2399 | // constructor. |
2400 | ExprResult NewDefArg; |
2401 | if (OldParam->hasDefaultArg()) { |
2402 | // We don't care what the value is (we won't use it); just create a |
2403 | // placeholder to indicate there is a default argument. |
2404 | QualType ParamTy = NewDI->getType(); |
2405 | NewDefArg = new (SemaRef.Context) |
2406 | OpaqueValueExpr(OldParam->getDefaultArg()->getBeginLoc(), |
2407 | ParamTy.getNonLValueExprType(SemaRef.Context), |
2408 | ParamTy->isLValueReferenceType() ? VK_LValue |
2409 | : ParamTy->isRValueReferenceType() ? VK_XValue |
2410 | : VK_PRValue); |
2411 | } |
2412 | |
2413 | ParmVarDecl *NewParam = ParmVarDecl::Create(SemaRef.Context, DC, |
2414 | OldParam->getInnerLocStart(), |
2415 | OldParam->getLocation(), |
2416 | OldParam->getIdentifier(), |
2417 | NewDI->getType(), |
2418 | NewDI, |
2419 | OldParam->getStorageClass(), |
2420 | NewDefArg.get()); |
2421 | NewParam->setScopeInfo(OldParam->getFunctionScopeDepth(), |
2422 | OldParam->getFunctionScopeIndex()); |
2423 | SemaRef.CurrentInstantiationScope->InstantiatedLocal(OldParam, NewParam); |
2424 | return NewParam; |
2425 | } |
2426 | |
2427 | FunctionTemplateDecl *buildDeductionGuide( |
2428 | TemplateParameterList *TemplateParams, CXXConstructorDecl *Ctor, |
2429 | ExplicitSpecifier ES, TypeSourceInfo *TInfo, SourceLocation LocStart, |
2430 | SourceLocation Loc, SourceLocation LocEnd, |
2431 | llvm::ArrayRef<TypedefNameDecl *> MaterializedTypedefs = {}) { |
2432 | DeclarationNameInfo Name(DeductionGuideName, Loc); |
2433 | ArrayRef<ParmVarDecl *> Params = |
2434 | TInfo->getTypeLoc().castAs<FunctionProtoTypeLoc>().getParams(); |
2435 | |
2436 | // Build the implicit deduction guide template. |
2437 | auto *Guide = |
2438 | CXXDeductionGuideDecl::Create(SemaRef.Context, DC, LocStart, ES, Name, |
2439 | TInfo->getType(), TInfo, LocEnd, Ctor); |
2440 | Guide->setImplicit(); |
2441 | Guide->setParams(Params); |
2442 | |
2443 | for (auto *Param : Params) |
2444 | Param->setDeclContext(Guide); |
2445 | for (auto *TD : MaterializedTypedefs) |
2446 | TD->setDeclContext(Guide); |
2447 | |
2448 | auto *GuideTemplate = FunctionTemplateDecl::Create( |
2449 | SemaRef.Context, DC, Loc, DeductionGuideName, TemplateParams, Guide); |
2450 | GuideTemplate->setImplicit(); |
2451 | Guide->setDescribedFunctionTemplate(GuideTemplate); |
2452 | |
2453 | if (isa<CXXRecordDecl>(DC)) { |
2454 | Guide->setAccess(AS_public); |
2455 | GuideTemplate->setAccess(AS_public); |
2456 | } |
2457 | |
2458 | DC->addDecl(GuideTemplate); |
2459 | return GuideTemplate; |
2460 | } |
2461 | }; |
2462 | } |
2463 | |
2464 | void Sema::DeclareImplicitDeductionGuides(TemplateDecl *Template, |
2465 | SourceLocation Loc) { |
2466 | if (CXXRecordDecl *DefRecord = |
2467 | cast<CXXRecordDecl>(Template->getTemplatedDecl())->getDefinition()) { |
2468 | TemplateDecl *DescribedTemplate = DefRecord->getDescribedClassTemplate(); |
2469 | Template = DescribedTemplate ? DescribedTemplate : Template; |
2470 | } |
2471 | |
2472 | DeclContext *DC = Template->getDeclContext(); |
2473 | if (DC->isDependentContext()) |
2474 | return; |
2475 | |
2476 | ConvertConstructorToDeductionGuideTransform Transform( |
2477 | *this, cast<ClassTemplateDecl>(Template)); |
2478 | if (!isCompleteType(Loc, Transform.DeducedType)) |
2479 | return; |
2480 | |
2481 | // Check whether we've already declared deduction guides for this template. |
2482 | // FIXME: Consider storing a flag on the template to indicate this. |
2483 | auto Existing = DC->lookup(Transform.DeductionGuideName); |
2484 | for (auto *D : Existing) |
2485 | if (D->isImplicit()) |
2486 | return; |
2487 | |
2488 | // In case we were expanding a pack when we attempted to declare deduction |
2489 | // guides, turn off pack expansion for everything we're about to do. |
2490 | ArgumentPackSubstitutionIndexRAII SubstIndex(*this, -1); |
2491 | // Create a template instantiation record to track the "instantiation" of |
2492 | // constructors into deduction guides. |
2493 | // FIXME: Add a kind for this to give more meaningful diagnostics. But can |
2494 | // this substitution process actually fail? |
2495 | InstantiatingTemplate BuildingDeductionGuides(*this, Loc, Template); |
2496 | if (BuildingDeductionGuides.isInvalid()) |
2497 | return; |
2498 | |
2499 | // Convert declared constructors into deduction guide templates. |
2500 | // FIXME: Skip constructors for which deduction must necessarily fail (those |
2501 | // for which some class template parameter without a default argument never |
2502 | // appears in a deduced context). |
2503 | bool AddedAny = false; |
2504 | for (NamedDecl *D : LookupConstructors(Transform.Primary)) { |
2505 | D = D->getUnderlyingDecl(); |
2506 | if (D->isInvalidDecl() || D->isImplicit()) |
2507 | continue; |
2508 | D = cast<NamedDecl>(D->getCanonicalDecl()); |
2509 | |
2510 | auto *FTD = dyn_cast<FunctionTemplateDecl>(D); |
2511 | auto *CD = |
2512 | dyn_cast_or_null<CXXConstructorDecl>(FTD ? FTD->getTemplatedDecl() : D); |
2513 | // Class-scope explicit specializations (MS extension) do not result in |
2514 | // deduction guides. |
2515 | if (!CD || (!FTD && CD->isFunctionTemplateSpecialization())) |
2516 | continue; |
2517 | |
2518 | // Cannot make a deduction guide when unparsed arguments are present. |
2519 | if (std::any_of(CD->param_begin(), CD->param_end(), [](ParmVarDecl *P) { |
2520 | return !P || P->hasUnparsedDefaultArg(); |
2521 | })) |
2522 | continue; |
2523 | |
2524 | Transform.transformConstructor(FTD, CD); |
2525 | AddedAny = true; |
2526 | } |
2527 | |
2528 | // C++17 [over.match.class.deduct] |
2529 | // -- If C is not defined or does not declare any constructors, an |
2530 | // additional function template derived as above from a hypothetical |
2531 | // constructor C(). |
2532 | if (!AddedAny) |
2533 | Transform.buildSimpleDeductionGuide(None); |
2534 | |
2535 | // -- An additional function template derived as above from a hypothetical |
2536 | // constructor C(C), called the copy deduction candidate. |
2537 | cast<CXXDeductionGuideDecl>( |
2538 | cast<FunctionTemplateDecl>( |
2539 | Transform.buildSimpleDeductionGuide(Transform.DeducedType)) |
2540 | ->getTemplatedDecl()) |
2541 | ->setIsCopyDeductionCandidate(); |
2542 | } |
2543 | |
2544 | /// Diagnose the presence of a default template argument on a |
2545 | /// template parameter, which is ill-formed in certain contexts. |
2546 | /// |
2547 | /// \returns true if the default template argument should be dropped. |
2548 | static bool DiagnoseDefaultTemplateArgument(Sema &S, |
2549 | Sema::TemplateParamListContext TPC, |
2550 | SourceLocation ParamLoc, |
2551 | SourceRange DefArgRange) { |
2552 | switch (TPC) { |
2553 | case Sema::TPC_ClassTemplate: |
2554 | case Sema::TPC_VarTemplate: |
2555 | case Sema::TPC_TypeAliasTemplate: |
2556 | return false; |
2557 | |
2558 | case Sema::TPC_FunctionTemplate: |
2559 | case Sema::TPC_FriendFunctionTemplateDefinition: |
2560 | // C++ [temp.param]p9: |
2561 | // A default template-argument shall not be specified in a |
2562 | // function template declaration or a function template |
2563 | // definition [...] |
2564 | // If a friend function template declaration specifies a default |
2565 | // template-argument, that declaration shall be a definition and shall be |
2566 | // the only declaration of the function template in the translation unit. |
2567 | // (C++98/03 doesn't have this wording; see DR226). |
2568 | S.Diag(ParamLoc, S.getLangOpts().CPlusPlus11 ? |
2569 | diag::warn_cxx98_compat_template_parameter_default_in_function_template |
2570 | : diag::ext_template_parameter_default_in_function_template) |
2571 | << DefArgRange; |
2572 | return false; |
2573 | |
2574 | case Sema::TPC_ClassTemplateMember: |
2575 | // C++0x [temp.param]p9: |
2576 | // A default template-argument shall not be specified in the |
2577 | // template-parameter-lists of the definition of a member of a |
2578 | // class template that appears outside of the member's class. |
2579 | S.Diag(ParamLoc, diag::err_template_parameter_default_template_member) |
2580 | << DefArgRange; |
2581 | return true; |
2582 | |
2583 | case Sema::TPC_FriendClassTemplate: |
2584 | case Sema::TPC_FriendFunctionTemplate: |
2585 | // C++ [temp.param]p9: |
2586 | // A default template-argument shall not be specified in a |
2587 | // friend template declaration. |
2588 | S.Diag(ParamLoc, diag::err_template_parameter_default_friend_template) |
2589 | << DefArgRange; |
2590 | return true; |
2591 | |
2592 | // FIXME: C++0x [temp.param]p9 allows default template-arguments |
2593 | // for friend function templates if there is only a single |
2594 | // declaration (and it is a definition). Strange! |
2595 | } |
2596 | |
2597 | llvm_unreachable("Invalid TemplateParamListContext!")__builtin_unreachable(); |
2598 | } |
2599 | |
2600 | /// Check for unexpanded parameter packs within the template parameters |
2601 | /// of a template template parameter, recursively. |
2602 | static bool DiagnoseUnexpandedParameterPacks(Sema &S, |
2603 | TemplateTemplateParmDecl *TTP) { |
2604 | // A template template parameter which is a parameter pack is also a pack |
2605 | // expansion. |
2606 | if (TTP->isParameterPack()) |
2607 | return false; |
2608 | |
2609 | TemplateParameterList *Params = TTP->getTemplateParameters(); |
2610 | for (unsigned I = 0, N = Params->size(); I != N; ++I) { |
2611 | NamedDecl *P = Params->getParam(I); |
2612 | if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(P)) { |
2613 | if (!TTP->isParameterPack()) |
2614 | if (const TypeConstraint *TC = TTP->getTypeConstraint()) |
2615 | if (TC->hasExplicitTemplateArgs()) |
2616 | for (auto &ArgLoc : TC->getTemplateArgsAsWritten()->arguments()) |
2617 | if (S.DiagnoseUnexpandedParameterPack(ArgLoc, |
2618 | Sema::UPPC_TypeConstraint)) |
2619 | return true; |
2620 | continue; |
2621 | } |
2622 | |
2623 | if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) { |
2624 | if (!NTTP->isParameterPack() && |
2625 | S.DiagnoseUnexpandedParameterPack(NTTP->getLocation(), |
2626 | NTTP->getTypeSourceInfo(), |
2627 | Sema::UPPC_NonTypeTemplateParameterType)) |
2628 | return true; |
2629 | |
2630 | continue; |
2631 | } |
2632 | |
2633 | if (TemplateTemplateParmDecl *InnerTTP |
2634 | = dyn_cast<TemplateTemplateParmDecl>(P)) |
2635 | if (DiagnoseUnexpandedParameterPacks(S, InnerTTP)) |
2636 | return true; |
2637 | } |
2638 | |
2639 | return false; |
2640 | } |
2641 | |
2642 | /// Checks the validity of a template parameter list, possibly |
2643 | /// considering the template parameter list from a previous |
2644 | /// declaration. |
2645 | /// |
2646 | /// If an "old" template parameter list is provided, it must be |
2647 | /// equivalent (per TemplateParameterListsAreEqual) to the "new" |
2648 | /// template parameter list. |
2649 | /// |
2650 | /// \param NewParams Template parameter list for a new template |
2651 | /// declaration. This template parameter list will be updated with any |
2652 | /// default arguments that are carried through from the previous |
2653 | /// template parameter list. |
2654 | /// |
2655 | /// \param OldParams If provided, template parameter list from a |
2656 | /// previous declaration of the same template. Default template |
2657 | /// arguments will be merged from the old template parameter list to |
2658 | /// the new template parameter list. |
2659 | /// |
2660 | /// \param TPC Describes the context in which we are checking the given |
2661 | /// template parameter list. |
2662 | /// |
2663 | /// \param SkipBody If we might have already made a prior merged definition |
2664 | /// of this template visible, the corresponding body-skipping information. |
2665 | /// Default argument redefinition is not an error when skipping such a body, |
2666 | /// because (under the ODR) we can assume the default arguments are the same |
2667 | /// as the prior merged definition. |
2668 | /// |
2669 | /// \returns true if an error occurred, false otherwise. |
2670 | bool Sema::CheckTemplateParameterList(TemplateParameterList *NewParams, |
2671 | TemplateParameterList *OldParams, |
2672 | TemplateParamListContext TPC, |
2673 | SkipBodyInfo *SkipBody) { |
2674 | bool Invalid = false; |
2675 | |
2676 | // C++ [temp.param]p10: |
2677 | // The set of default template-arguments available for use with a |
2678 | // template declaration or definition is obtained by merging the |
2679 | // default arguments from the definition (if in scope) and all |
2680 | // declarations in scope in the same way default function |
2681 | // arguments are (8.3.6). |
2682 | bool SawDefaultArgument = false; |
2683 | SourceLocation PreviousDefaultArgLoc; |
2684 | |
2685 | // Dummy initialization to avoid warnings. |
2686 | TemplateParameterList::iterator OldParam = NewParams->end(); |
2687 | if (OldParams) |
2688 | OldParam = OldParams->begin(); |
2689 | |
2690 | bool RemoveDefaultArguments = false; |
2691 | for (TemplateParameterList::iterator NewParam = NewParams->begin(), |
2692 | NewParamEnd = NewParams->end(); |
2693 | NewParam != NewParamEnd; ++NewParam) { |
2694 | // Variables used to diagnose redundant default arguments |
2695 | bool RedundantDefaultArg = false; |
2696 | SourceLocation OldDefaultLoc; |
2697 | SourceLocation NewDefaultLoc; |
2698 | |
2699 | // Variable used to diagnose missing default arguments |
2700 | bool MissingDefaultArg = false; |
2701 | |
2702 | // Variable used to diagnose non-final parameter packs |
2703 | bool SawParameterPack = false; |
2704 | |
2705 | if (TemplateTypeParmDecl *NewTypeParm |
2706 | = dyn_cast<TemplateTypeParmDecl>(*NewParam)) { |
2707 | // Check the presence of a default argument here. |
2708 | if (NewTypeParm->hasDefaultArgument() && |
2709 | DiagnoseDefaultTemplateArgument(*this, TPC, |
2710 | NewTypeParm->getLocation(), |
2711 | NewTypeParm->getDefaultArgumentInfo()->getTypeLoc() |
2712 | .getSourceRange())) |
2713 | NewTypeParm->removeDefaultArgument(); |
2714 | |
2715 | // Merge default arguments for template type parameters. |
2716 | TemplateTypeParmDecl *OldTypeParm |
2717 | = OldParams? cast<TemplateTypeParmDecl>(*OldParam) : nullptr; |
2718 | if (NewTypeParm->isParameterPack()) { |
2719 | assert(!NewTypeParm->hasDefaultArgument() &&((void)0) |
2720 | "Parameter packs can't have a default argument!")((void)0); |
2721 | SawParameterPack = true; |
2722 | } else if (OldTypeParm && hasVisibleDefaultArgument(OldTypeParm) && |
2723 | NewTypeParm->hasDefaultArgument() && |
2724 | (!SkipBody || !SkipBody->ShouldSkip)) { |
2725 | OldDefaultLoc = OldTypeParm->getDefaultArgumentLoc(); |
2726 | NewDefaultLoc = NewTypeParm->getDefaultArgumentLoc(); |
2727 | SawDefaultArgument = true; |
2728 | RedundantDefaultArg = true; |
2729 | PreviousDefaultArgLoc = NewDefaultLoc; |
2730 | } else if (OldTypeParm && OldTypeParm->hasDefaultArgument()) { |
2731 | // Merge the default argument from the old declaration to the |
2732 | // new declaration. |
2733 | NewTypeParm->setInheritedDefaultArgument(Context, OldTypeParm); |
2734 | PreviousDefaultArgLoc = OldTypeParm->getDefaultArgumentLoc(); |
2735 | } else if (NewTypeParm->hasDefaultArgument()) { |
2736 | SawDefaultArgument = true; |
2737 | PreviousDefaultArgLoc = NewTypeParm->getDefaultArgumentLoc(); |
2738 | } else if (SawDefaultArgument) |
2739 | MissingDefaultArg = true; |
2740 | } else if (NonTypeTemplateParmDecl *NewNonTypeParm |
2741 | = dyn_cast<NonTypeTemplateParmDecl>(*NewParam)) { |
2742 | // Check for unexpanded parameter packs. |
2743 | if (!NewNonTypeParm->isParameterPack() && |
2744 | DiagnoseUnexpandedParameterPack(NewNonTypeParm->getLocation(), |
2745 | NewNonTypeParm->getTypeSourceInfo(), |
2746 | UPPC_NonTypeTemplateParameterType)) { |
2747 | Invalid = true; |
2748 | continue; |
2749 | } |
2750 | |
2751 | // Check the presence of a default argument here. |
2752 | if (NewNonTypeParm->hasDefaultArgument() && |
2753 | DiagnoseDefaultTemplateArgument(*this, TPC, |
2754 | NewNonTypeParm->getLocation(), |
2755 | NewNonTypeParm->getDefaultArgument()->getSourceRange())) { |
2756 | NewNonTypeParm->removeDefaultArgument(); |
2757 | } |
2758 | |
2759 | // Merge default arguments for non-type template parameters |
2760 | NonTypeTemplateParmDecl *OldNonTypeParm |
2761 | = OldParams? cast<NonTypeTemplateParmDecl>(*OldParam) : nullptr; |
2762 | if (NewNonTypeParm->isParameterPack()) { |
2763 | assert(!NewNonTypeParm->hasDefaultArgument() &&((void)0) |
2764 | "Parameter packs can't have a default argument!")((void)0); |
2765 | if (!NewNonTypeParm->isPackExpansion()) |
2766 | SawParameterPack = true; |
2767 | } else if (OldNonTypeParm && hasVisibleDefaultArgument(OldNonTypeParm) && |
2768 | NewNonTypeParm->hasDefaultArgument() && |
2769 | (!SkipBody || !SkipBody->ShouldSkip)) { |
2770 | OldDefaultLoc = OldNonTypeParm->getDefaultArgumentLoc(); |
2771 | NewDefaultLoc = NewNonTypeParm->getDefaultArgumentLoc(); |
2772 | SawDefaultArgument = true; |
2773 | RedundantDefaultArg = true; |
2774 | PreviousDefaultArgLoc = NewDefaultLoc; |
2775 | } else if (OldNonTypeParm && OldNonTypeParm->hasDefaultArgument()) { |
2776 | // Merge the default argument from the old declaration to the |
2777 | // new declaration. |
2778 | NewNonTypeParm->setInheritedDefaultArgument(Context, OldNonTypeParm); |
2779 | PreviousDefaultArgLoc = OldNonTypeParm->getDefaultArgumentLoc(); |
2780 | } else if (NewNonTypeParm->hasDefaultArgument()) { |
2781 | SawDefaultArgument = true; |
2782 | PreviousDefaultArgLoc = NewNonTypeParm->getDefaultArgumentLoc(); |
2783 | } else if (SawDefaultArgument) |
2784 | MissingDefaultArg = true; |
2785 | } else { |
2786 | TemplateTemplateParmDecl *NewTemplateParm |
2787 | = cast<TemplateTemplateParmDecl>(*NewParam); |
2788 | |
2789 | // Check for unexpanded parameter packs, recursively. |
2790 | if (::DiagnoseUnexpandedParameterPacks(*this, NewTemplateParm)) { |
2791 | Invalid = true; |
2792 | continue; |
2793 | } |
2794 | |
2795 | // Check the presence of a default argument here. |
2796 | if (NewTemplateParm->hasDefaultArgument() && |
2797 | DiagnoseDefaultTemplateArgument(*this, TPC, |
2798 | NewTemplateParm->getLocation(), |
2799 | NewTemplateParm->getDefaultArgument().getSourceRange())) |
2800 | NewTemplateParm->removeDefaultArgument(); |
2801 | |
2802 | // Merge default arguments for template template parameters |
2803 | TemplateTemplateParmDecl *OldTemplateParm |
2804 | = OldParams? cast<TemplateTemplateParmDecl>(*OldParam) : nullptr; |
2805 | if (NewTemplateParm->isParameterPack()) { |
2806 | assert(!NewTemplateParm->hasDefaultArgument() &&((void)0) |
2807 | "Parameter packs can't have a default argument!")((void)0); |
2808 | if (!NewTemplateParm->isPackExpansion()) |
2809 | SawParameterPack = true; |
2810 | } else if (OldTemplateParm && |
2811 | hasVisibleDefaultArgument(OldTemplateParm) && |
2812 | NewTemplateParm->hasDefaultArgument() && |
2813 | (!SkipBody || !SkipBody->ShouldSkip)) { |
2814 | OldDefaultLoc = OldTemplateParm->getDefaultArgument().getLocation(); |
2815 | NewDefaultLoc = NewTemplateParm->getDefaultArgument().getLocation(); |
2816 | SawDefaultArgument = true; |
2817 | RedundantDefaultArg = true; |
2818 | PreviousDefaultArgLoc = NewDefaultLoc; |
2819 | } else if (OldTemplateParm && OldTemplateParm->hasDefaultArgument()) { |
2820 | // Merge the default argument from the old declaration to the |
2821 | // new declaration. |
2822 | NewTemplateParm->setInheritedDefaultArgument(Context, OldTemplateParm); |
2823 | PreviousDefaultArgLoc |
2824 | = OldTemplateParm->getDefaultArgument().getLocation(); |
2825 | } else if (NewTemplateParm->hasDefaultArgument()) { |
2826 | SawDefaultArgument = true; |
2827 | PreviousDefaultArgLoc |
2828 | = NewTemplateParm->getDefaultArgument().getLocation(); |
2829 | } else if (SawDefaultArgument) |
2830 | MissingDefaultArg = true; |
2831 | } |
2832 | |
2833 | // C++11 [temp.param]p11: |
2834 | // If a template parameter of a primary class template or alias template |
2835 | // is a template parameter pack, it shall be the last template parameter. |
2836 | if (SawParameterPack && (NewParam + 1) != NewParamEnd && |
2837 | (TPC == TPC_ClassTemplate || TPC == TPC_VarTemplate || |
2838 | TPC == TPC_TypeAliasTemplate)) { |
2839 | Diag((*NewParam)->getLocation(), |
2840 | diag::err_template_param_pack_must_be_last_template_parameter); |
2841 | Invalid = true; |
2842 | } |
2843 | |
2844 | if (RedundantDefaultArg) { |
2845 | // C++ [temp.param]p12: |
2846 | // A template-parameter shall not be given default arguments |
2847 | // by two different declarations in the same scope. |
2848 | Diag(NewDefaultLoc, diag::err_template_param_default_arg_redefinition); |
2849 | Diag(OldDefaultLoc, diag::note_template_param_prev_default_arg); |
2850 | Invalid = true; |
2851 | } else if (MissingDefaultArg && TPC != TPC_FunctionTemplate) { |
2852 | // C++ [temp.param]p11: |
2853 | // If a template-parameter of a class template has a default |
2854 | // template-argument, each subsequent template-parameter shall either |
2855 | // have a default template-argument supplied or be a template parameter |
2856 | // pack. |
2857 | Diag((*NewParam)->getLocation(), |
2858 | diag::err_template_param_default_arg_missing); |
2859 | Diag(PreviousDefaultArgLoc, diag::note_template_param_prev_default_arg); |
2860 | Invalid = true; |
2861 | RemoveDefaultArguments = true; |
2862 | } |
2863 | |
2864 | // If we have an old template parameter list that we're merging |
2865 | // in, move on to the next parameter. |
2866 | if (OldParams) |
2867 | ++OldParam; |
2868 | } |
2869 | |
2870 | // We were missing some default arguments at the end of the list, so remove |
2871 | // all of the default arguments. |
2872 | if (RemoveDefaultArguments) { |
2873 | for (TemplateParameterList::iterator NewParam = NewParams->begin(), |
2874 | NewParamEnd = NewParams->end(); |
2875 | NewParam != NewParamEnd; ++NewParam) { |
2876 | if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*NewParam)) |
2877 | TTP->removeDefaultArgument(); |
2878 | else if (NonTypeTemplateParmDecl *NTTP |
2879 | = dyn_cast<NonTypeTemplateParmDecl>(*NewParam)) |
2880 | NTTP->removeDefaultArgument(); |
2881 | else |
2882 | cast<TemplateTemplateParmDecl>(*NewParam)->removeDefaultArgument(); |
2883 | } |
2884 | } |
2885 | |
2886 | return Invalid; |
2887 | } |
2888 | |
2889 | namespace { |
2890 | |
2891 | /// A class which looks for a use of a certain level of template |
2892 | /// parameter. |
2893 | struct DependencyChecker : RecursiveASTVisitor<DependencyChecker> { |
2894 | typedef RecursiveASTVisitor<DependencyChecker> super; |
2895 | |
2896 | unsigned Depth; |
2897 | |
2898 | // Whether we're looking for a use of a template parameter that makes the |
2899 | // overall construct type-dependent / a dependent type. This is strictly |
2900 | // best-effort for now; we may fail to match at all for a dependent type |
2901 | // in some cases if this is set. |
2902 | bool IgnoreNonTypeDependent; |
2903 | |
2904 | bool Match; |
2905 | SourceLocation MatchLoc; |
2906 | |
2907 | DependencyChecker(unsigned Depth, bool IgnoreNonTypeDependent) |
2908 | : Depth(Depth), IgnoreNonTypeDependent(IgnoreNonTypeDependent), |
2909 | Match(false) {} |
2910 | |
2911 | DependencyChecker(TemplateParameterList *Params, bool IgnoreNonTypeDependent) |
2912 | : IgnoreNonTypeDependent(IgnoreNonTypeDependent), Match(false) { |
2913 | NamedDecl *ND = Params->getParam(0); |
2914 | if (TemplateTypeParmDecl *PD = dyn_cast<TemplateTypeParmDecl>(ND)) { |
2915 | Depth = PD->getDepth(); |
2916 | } else if (NonTypeTemplateParmDecl *PD = |
2917 | dyn_cast<NonTypeTemplateParmDecl>(ND)) { |
2918 | Depth = PD->getDepth(); |
2919 | } else { |
2920 | Depth = cast<TemplateTemplateParmDecl>(ND)->getDepth(); |
2921 | } |
2922 | } |
2923 | |
2924 | bool Matches(unsigned ParmDepth, SourceLocation Loc = SourceLocation()) { |
2925 | if (ParmDepth >= Depth) { |
2926 | Match = true; |
2927 | MatchLoc = Loc; |
2928 | return true; |
2929 | } |
2930 | return false; |
2931 | } |
2932 | |
2933 | bool TraverseStmt(Stmt *S, DataRecursionQueue *Q = nullptr) { |
2934 | // Prune out non-type-dependent expressions if requested. This can |
2935 | // sometimes result in us failing to find a template parameter reference |
2936 | // (if a value-dependent expression creates a dependent type), but this |
2937 | // mode is best-effort only. |
2938 | if (auto *E = dyn_cast_or_null<Expr>(S)) |
2939 | if (IgnoreNonTypeDependent && !E->isTypeDependent()) |
2940 | return true; |
2941 | return super::TraverseStmt(S, Q); |
2942 | } |
2943 | |
2944 | bool TraverseTypeLoc(TypeLoc TL) { |
2945 | if (IgnoreNonTypeDependent && !TL.isNull() && |
2946 | !TL.getType()->isDependentType()) |
2947 | return true; |
2948 | return super::TraverseTypeLoc(TL); |
2949 | } |
2950 | |
2951 | bool VisitTemplateTypeParmTypeLoc(TemplateTypeParmTypeLoc TL) { |
2952 | return !Matches(TL.getTypePtr()->getDepth(), TL.getNameLoc()); |
2953 | } |
2954 | |
2955 | bool VisitTemplateTypeParmType(const TemplateTypeParmType *T) { |
2956 | // For a best-effort search, keep looking until we find a location. |
2957 | return IgnoreNonTypeDependent || !Matches(T->getDepth()); |
2958 | } |
2959 | |
2960 | bool TraverseTemplateName(TemplateName N) { |
2961 | if (TemplateTemplateParmDecl *PD = |
2962 | dyn_cast_or_null<TemplateTemplateParmDecl>(N.getAsTemplateDecl())) |
2963 | if (Matches(PD->getDepth())) |
2964 | return false; |
2965 | return super::TraverseTemplateName(N); |
2966 | } |
2967 | |
2968 | bool VisitDeclRefExpr(DeclRefExpr *E) { |
2969 | if (NonTypeTemplateParmDecl *PD = |
2970 | dyn_cast<NonTypeTemplateParmDecl>(E->getDecl())) |
2971 | if (Matches(PD->getDepth(), E->getExprLoc())) |
2972 | return false; |
2973 | return super::VisitDeclRefExpr(E); |
2974 | } |
2975 | |
2976 | bool VisitSubstTemplateTypeParmType(const SubstTemplateTypeParmType *T) { |
2977 | return TraverseType(T->getReplacementType()); |
2978 | } |
2979 | |
2980 | bool |
2981 | VisitSubstTemplateTypeParmPackType(const SubstTemplateTypeParmPackType *T) { |
2982 | return TraverseTemplateArgument(T->getArgumentPack()); |
2983 | } |
2984 | |
2985 | bool TraverseInjectedClassNameType(const InjectedClassNameType *T) { |
2986 | return TraverseType(T->getInjectedSpecializationType()); |
2987 | } |
2988 | }; |
2989 | } // end anonymous namespace |
2990 | |
2991 | /// Determines whether a given type depends on the given parameter |
2992 | /// list. |
2993 | static bool |
2994 | DependsOnTemplateParameters(QualType T, TemplateParameterList *Params) { |
2995 | if (!Params->size()) |
2996 | return false; |
2997 | |
2998 | DependencyChecker Checker(Params, /*IgnoreNonTypeDependent*/false); |
2999 | Checker.TraverseType(T); |
3000 | return Checker.Match; |
3001 | } |
3002 | |
3003 | // Find the source range corresponding to the named type in the given |
3004 | // nested-name-specifier, if any. |
3005 | static SourceRange getRangeOfTypeInNestedNameSpecifier(ASTContext &Context, |
3006 | QualType T, |
3007 | const CXXScopeSpec &SS) { |
3008 | NestedNameSpecifierLoc NNSLoc(SS.getScopeRep(), SS.location_data()); |
3009 | while (NestedNameSpecifier *NNS = NNSLoc.getNestedNameSpecifier()) { |
3010 | if (const Type *CurType = NNS->getAsType()) { |
3011 | if (Context.hasSameUnqualifiedType(T, QualType(CurType, 0))) |
3012 | return NNSLoc.getTypeLoc().getSourceRange(); |
3013 | } else |
3014 | break; |
3015 | |
3016 | NNSLoc = NNSLoc.getPrefix(); |
3017 | } |
3018 | |
3019 | return SourceRange(); |
3020 | } |
3021 | |
3022 | /// Match the given template parameter lists to the given scope |
3023 | /// specifier, returning the template parameter list that applies to the |
3024 | /// name. |
3025 | /// |
3026 | /// \param DeclStartLoc the start of the declaration that has a scope |
3027 | /// specifier or a template parameter list. |
3028 | /// |
3029 | /// \param DeclLoc The location of the declaration itself. |
3030 | /// |
3031 | /// \param SS the scope specifier that will be matched to the given template |
3032 | /// parameter lists. This scope specifier precedes a qualified name that is |
3033 | /// being declared. |
3034 | /// |
3035 | /// \param TemplateId The template-id following the scope specifier, if there |
3036 | /// is one. Used to check for a missing 'template<>'. |
3037 | /// |
3038 | /// \param ParamLists the template parameter lists, from the outermost to the |
3039 | /// innermost template parameter lists. |
3040 | /// |
3041 | /// \param IsFriend Whether to apply the slightly different rules for |
3042 | /// matching template parameters to scope specifiers in friend |
3043 | /// declarations. |
3044 | /// |
3045 | /// \param IsMemberSpecialization will be set true if the scope specifier |
3046 | /// denotes a fully-specialized type, and therefore this is a declaration of |
3047 | /// a member specialization. |
3048 | /// |
3049 | /// \returns the template parameter list, if any, that corresponds to the |
3050 | /// name that is preceded by the scope specifier @p SS. This template |
3051 | /// parameter list may have template parameters (if we're declaring a |
3052 | /// template) or may have no template parameters (if we're declaring a |
3053 | /// template specialization), or may be NULL (if what we're declaring isn't |
3054 | /// itself a template). |
3055 | TemplateParameterList *Sema::MatchTemplateParametersToScopeSpecifier( |
3056 | SourceLocation DeclStartLoc, SourceLocation DeclLoc, const CXXScopeSpec &SS, |
3057 | TemplateIdAnnotation *TemplateId, |
3058 | ArrayRef<TemplateParameterList *> ParamLists, bool IsFriend, |
3059 | bool &IsMemberSpecialization, bool &Invalid, bool SuppressDiagnostic) { |
3060 | IsMemberSpecialization = false; |
3061 | Invalid = false; |
3062 | |
3063 | // The sequence of nested types to which we will match up the template |
3064 | // parameter lists. We first build this list by starting with the type named |
3065 | // by the nested-name-specifier and walking out until we run out of types. |
3066 | SmallVector<QualType, 4> NestedTypes; |
3067 | QualType T; |
3068 | if (SS.getScopeRep()) { |
3069 | if (CXXRecordDecl *Record |
3070 | = dyn_cast_or_null<CXXRecordDecl>(computeDeclContext(SS, true))) |
3071 | T = Context.getTypeDeclType(Record); |
3072 | else |
3073 | T = QualType(SS.getScopeRep()->getAsType(), 0); |
3074 | } |
3075 | |
3076 | // If we found an explicit specialization that prevents us from needing |
3077 | // 'template<>' headers, this will be set to the location of that |
3078 | // explicit specialization. |
3079 | SourceLocation ExplicitSpecLoc; |
3080 | |
3081 | while (!T.isNull()) { |
3082 | NestedTypes.push_back(T); |
3083 | |
3084 | // Retrieve the parent of a record type. |
3085 | if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) { |
3086 | // If this type is an explicit specialization, we're done. |
3087 | if (ClassTemplateSpecializationDecl *Spec |
3088 | = dyn_cast<ClassTemplateSpecializationDecl>(Record)) { |
3089 | if (!isa<ClassTemplatePartialSpecializationDecl>(Spec) && |
3090 | Spec->getSpecializationKind() == TSK_ExplicitSpecialization) { |
3091 | ExplicitSpecLoc = Spec->getLocation(); |
3092 | break; |
3093 | } |
3094 | } else if (Record->getTemplateSpecializationKind() |
3095 | == TSK_ExplicitSpecialization) { |
3096 | ExplicitSpecLoc = Record->getLocation(); |
3097 | break; |
3098 | } |
3099 | |
3100 | if (TypeDecl *Parent = dyn_cast<TypeDecl>(Record->getParent())) |
3101 | T = Context.getTypeDeclType(Parent); |
3102 | else |
3103 | T = QualType(); |
3104 | continue; |
3105 | } |
3106 | |
3107 | if (const TemplateSpecializationType *TST |
3108 | = T->getAs<TemplateSpecializationType>()) { |
3109 | if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) { |
3110 | if (TypeDecl *Parent = dyn_cast<TypeDecl>(Template->getDeclContext())) |
3111 | T = Context.getTypeDeclType(Parent); |
3112 | else |
3113 | T = QualType(); |
3114 | continue; |
3115 | } |
3116 | } |
3117 | |
3118 | // Look one step prior in a dependent template specialization type. |
3119 | if (const DependentTemplateSpecializationType *DependentTST |
3120 | = T->getAs<DependentTemplateSpecializationType>()) { |
3121 | if (NestedNameSpecifier *NNS = DependentTST->getQualifier()) |
3122 | T = QualType(NNS->getAsType(), 0); |
3123 | else |
3124 | T = QualType(); |
3125 | continue; |
3126 | } |
3127 | |
3128 | // Look one step prior in a dependent name type. |
3129 | if (const DependentNameType *DependentName = T->getAs<DependentNameType>()){ |
3130 | if (NestedNameSpecifier *NNS = DependentName->getQualifier()) |
3131 | T = QualType(NNS->getAsType(), 0); |
3132 | else |
3133 | T = QualType(); |
3134 | continue; |
3135 | } |
3136 | |
3137 | // Retrieve the parent of an enumeration type. |
3138 | if (const EnumType *EnumT = T->getAs<EnumType>()) { |
3139 | // FIXME: Forward-declared enums require a TSK_ExplicitSpecialization |
3140 | // check here. |
3141 | EnumDecl *Enum = EnumT->getDecl(); |
3142 | |
3143 | // Get to the parent type. |
3144 | if (TypeDecl *Parent = dyn_cast<TypeDecl>(Enum->getParent())) |
3145 | T = Context.getTypeDeclType(Parent); |
3146 | else |
3147 | T = QualType(); |
3148 | continue; |
3149 | } |
3150 | |
3151 | T = QualType(); |
3152 | } |
3153 | // Reverse the nested types list, since we want to traverse from the outermost |
3154 | // to the innermost while checking template-parameter-lists. |
3155 | std::reverse(NestedTypes.begin(), NestedTypes.end()); |
3156 | |
3157 | // C++0x [temp.expl.spec]p17: |
3158 | // A member or a member template may be nested within many |
3159 | // enclosing class templates. In an explicit specialization for |
3160 | // such a member, the member declaration shall be preceded by a |
3161 | // template<> for each enclosing class template that is |
3162 | // explicitly specialized. |
3163 | bool SawNonEmptyTemplateParameterList = false; |
3164 | |
3165 | auto CheckExplicitSpecialization = [&](SourceRange Range, bool Recovery) { |
3166 | if (SawNonEmptyTemplateParameterList) { |
3167 | if (!SuppressDiagnostic) |
3168 | Diag(DeclLoc, diag::err_specialize_member_of_template) |
3169 | << !Recovery << Range; |
3170 | Invalid = true; |
3171 | IsMemberSpecialization = false; |
3172 | return true; |
3173 | } |
3174 | |
3175 | return false; |
3176 | }; |
3177 | |
3178 | auto DiagnoseMissingExplicitSpecialization = [&] (SourceRange Range) { |
3179 | // Check that we can have an explicit specialization here. |
3180 | if (CheckExplicitSpecialization(Range, true)) |
3181 | return true; |
3182 | |
3183 | // We don't have a template header, but we should. |
3184 | SourceLocation ExpectedTemplateLoc; |
3185 | if (!ParamLists.empty()) |
3186 | ExpectedTemplateLoc = ParamLists[0]->getTemplateLoc(); |
3187 | else |
3188 | ExpectedTemplateLoc = DeclStartLoc; |
3189 | |
3190 | if (!SuppressDiagnostic) |
3191 | Diag(DeclLoc, diag::err_template_spec_needs_header) |
3192 | << Range |
3193 | << FixItHint::CreateInsertion(ExpectedTemplateLoc, "template<> "); |
3194 | return false; |
3195 | }; |
3196 | |
3197 | unsigned ParamIdx = 0; |
3198 | for (unsigned TypeIdx = 0, NumTypes = NestedTypes.size(); TypeIdx != NumTypes; |
3199 | ++TypeIdx) { |
3200 | T = NestedTypes[TypeIdx]; |
3201 | |
3202 | // Whether we expect a 'template<>' header. |
3203 | bool NeedEmptyTemplateHeader = false; |
3204 | |
3205 | // Whether we expect a template header with parameters. |
3206 | bool NeedNonemptyTemplateHeader = false; |
3207 | |
3208 | // For a dependent type, the set of template parameters that we |
3209 | // expect to see. |
3210 | TemplateParameterList *ExpectedTemplateParams = nullptr; |
3211 | |
3212 | // C++0x [temp.expl.spec]p15: |
3213 | // A member or a member template may be nested within many enclosing |
3214 | // class templates. In an explicit specialization for such a member, the |
3215 | // member declaration shall be preceded by a template<> for each |
3216 | // enclosing class template that is explicitly specialized. |
3217 | if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) { |
3218 | if (ClassTemplatePartialSpecializationDecl *Partial |
3219 | = dyn_cast<ClassTemplatePartialSpecializationDecl>(Record)) { |
3220 | ExpectedTemplateParams = Partial->getTemplateParameters(); |
3221 | NeedNonemptyTemplateHeader = true; |
3222 | } else if (Record->isDependentType()) { |
3223 | if (Record->getDescribedClassTemplate()) { |
3224 | ExpectedTemplateParams = Record->getDescribedClassTemplate() |
3225 | ->getTemplateParameters(); |
3226 | NeedNonemptyTemplateHeader = true; |
3227 | } |
3228 | } else if (ClassTemplateSpecializationDecl *Spec |
3229 | = dyn_cast<ClassTemplateSpecializationDecl>(Record)) { |
3230 | // C++0x [temp.expl.spec]p4: |
3231 | // Members of an explicitly specialized class template are defined |
3232 | // in the same manner as members of normal classes, and not using |
3233 | // the template<> syntax. |
3234 | if (Spec->getSpecializationKind() != TSK_ExplicitSpecialization) |
3235 | NeedEmptyTemplateHeader = true; |
3236 | else |
3237 | continue; |
3238 | } else if (Record->getTemplateSpecializationKind()) { |
3239 | if (Record->getTemplateSpecializationKind() |
3240 | != TSK_ExplicitSpecialization && |
3241 | TypeIdx == NumTypes - 1) |
3242 | IsMemberSpecialization = true; |
3243 | |
3244 | continue; |
3245 | } |
3246 | } else if (const TemplateSpecializationType *TST |
3247 | = T->getAs<TemplateSpecializationType>()) { |
3248 | if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) { |
3249 | ExpectedTemplateParams = Template->getTemplateParameters(); |
3250 | NeedNonemptyTemplateHeader = true; |
3251 | } |
3252 | } else if (T->getAs<DependentTemplateSpecializationType>()) { |
3253 | // FIXME: We actually could/should check the template arguments here |
3254 | // against the corresponding template parameter list. |
3255 | NeedNonemptyTemplateHeader = false; |
3256 | } |
3257 | |
3258 | // C++ [temp.expl.spec]p16: |
3259 | // In an explicit specialization declaration for a member of a class |
3260 | // template or a member template that ap- pears in namespace scope, the |
3261 | // member template and some of its enclosing class templates may remain |
3262 | // unspecialized, except that the declaration shall not explicitly |
3263 | // specialize a class member template if its en- closing class templates |
3264 | // are not explicitly specialized as well. |
3265 | if (ParamIdx < ParamLists.size()) { |
3266 | if (ParamLists[ParamIdx]->size() == 0) { |
3267 | if (CheckExplicitSpecialization(ParamLists[ParamIdx]->getSourceRange(), |
3268 | false)) |
3269 | return nullptr; |
3270 | } else |
3271 | SawNonEmptyTemplateParameterList = true; |
3272 | } |
3273 | |
3274 | if (NeedEmptyTemplateHeader) { |
3275 | // If we're on the last of the types, and we need a 'template<>' header |
3276 | // here, then it's a member specialization. |
3277 | if (TypeIdx == NumTypes - 1) |
3278 | IsMemberSpecialization = true; |
3279 | |
3280 | if (ParamIdx < ParamLists.size()) { |
3281 | if (ParamLists[ParamIdx]->size() > 0) { |
3282 | // The header has template parameters when it shouldn't. Complain. |
3283 | if (!SuppressDiagnostic) |
3284 | Diag(ParamLists[ParamIdx]->getTemplateLoc(), |
3285 | diag::err_template_param_list_matches_nontemplate) |
3286 | << T |
3287 | << SourceRange(ParamLists[ParamIdx]->getLAngleLoc(), |
3288 | ParamLists[ParamIdx]->getRAngleLoc()) |
3289 | << getRangeOfTypeInNestedNameSpecifier(Context, T, SS); |
3290 | Invalid = true; |
3291 | return nullptr; |
3292 | } |
3293 | |
3294 | // Consume this template header. |
3295 | ++ParamIdx; |
3296 | continue; |
3297 | } |
3298 | |
3299 | if (!IsFriend) |
3300 | if (DiagnoseMissingExplicitSpecialization( |
3301 | getRangeOfTypeInNestedNameSpecifier(Context, T, SS))) |
3302 | return nullptr; |
3303 | |
3304 | continue; |
3305 | } |
3306 | |
3307 | if (NeedNonemptyTemplateHeader) { |
3308 | // In friend declarations we can have template-ids which don't |
3309 | // depend on the corresponding template parameter lists. But |
3310 | // assume that empty parameter lists are supposed to match this |
3311 | // template-id. |
3312 | if (IsFriend && T->isDependentType()) { |
3313 | if (ParamIdx < ParamLists.size() && |
3314 | DependsOnTemplateParameters(T, ParamLists[ParamIdx])) |
3315 | ExpectedTemplateParams = nullptr; |
3316 | else |
3317 | continue; |
3318 | } |
3319 | |
3320 | if (ParamIdx < ParamLists.size()) { |
3321 | // Check the template parameter list, if we can. |
3322 | if (ExpectedTemplateParams && |
3323 | !TemplateParameterListsAreEqual(ParamLists[ParamIdx], |
3324 | ExpectedTemplateParams, |
3325 | !SuppressDiagnostic, TPL_TemplateMatch)) |
3326 | Invalid = true; |
3327 | |
3328 | if (!Invalid && |
3329 | CheckTemplateParameterList(ParamLists[ParamIdx], nullptr, |
3330 | TPC_ClassTemplateMember)) |
3331 | Invalid = true; |
3332 | |
3333 | ++ParamIdx; |
3334 | continue; |
3335 | } |
3336 | |
3337 | if (!SuppressDiagnostic) |
3338 | Diag(DeclLoc, diag::err_template_spec_needs_template_parameters) |
3339 | << T |
3340 | << getRangeOfTypeInNestedNameSpecifier(Context, T, SS); |
3341 | Invalid = true; |
3342 | continue; |
3343 | } |
3344 | } |
3345 | |
3346 | // If there were at least as many template-ids as there were template |
3347 | // parameter lists, then there are no template parameter lists remaining for |
3348 | // the declaration itself. |
3349 | if (ParamIdx >= ParamLists.size()) { |
3350 | if (TemplateId && !IsFriend) { |
3351 | // We don't have a template header for the declaration itself, but we |
3352 | // should. |
3353 | DiagnoseMissingExplicitSpecialization(SourceRange(TemplateId->LAngleLoc, |
3354 | TemplateId->RAngleLoc)); |
3355 | |
3356 | // Fabricate an empty template parameter list for the invented header. |
3357 | return TemplateParameterList::Create(Context, SourceLocation(), |
3358 | SourceLocation(), None, |
3359 | SourceLocation(), nullptr); |
3360 | } |
3361 | |
3362 | return nullptr; |
3363 | } |
3364 | |
3365 | // If there were too many template parameter lists, complain about that now. |
3366 | if (ParamIdx < ParamLists.size() - 1) { |
3367 | bool HasAnyExplicitSpecHeader = false; |
3368 | bool AllExplicitSpecHeaders = true; |
3369 | for (unsigned I = ParamIdx, E = ParamLists.size() - 1; I != E; ++I) { |
3370 | if (ParamLists[I]->size() == 0) |
3371 | HasAnyExplicitSpecHeader = true; |
3372 | else |
3373 | AllExplicitSpecHeaders = false; |
3374 | } |
3375 | |
3376 | if (!SuppressDiagnostic) |
3377 | Diag(ParamLists[ParamIdx]->getTemplateLoc(), |
3378 | AllExplicitSpecHeaders ? diag::warn_template_spec_extra_headers |
3379 | : diag::err_template_spec_extra_headers) |
3380 | << SourceRange(ParamLists[ParamIdx]->getTemplateLoc(), |
3381 | ParamLists[ParamLists.size() - 2]->getRAngleLoc()); |
3382 | |
3383 | // If there was a specialization somewhere, such that 'template<>' is |
3384 | // not required, and there were any 'template<>' headers, note where the |
3385 | // specialization occurred. |
3386 | if (ExplicitSpecLoc.isValid() && HasAnyExplicitSpecHeader && |
3387 | !SuppressDiagnostic) |
3388 | Diag(ExplicitSpecLoc, |
3389 | diag::note_explicit_template_spec_does_not_need_header) |
3390 | << NestedTypes.back(); |
3391 | |
3392 | // We have a template parameter list with no corresponding scope, which |
3393 | // means that the resulting template declaration can't be instantiated |
3394 | // properly (we'll end up with dependent nodes when we shouldn't). |
3395 | if (!AllExplicitSpecHeaders) |
3396 | Invalid = true; |
3397 | } |
3398 | |
3399 | // C++ [temp.expl.spec]p16: |
3400 | // In an explicit specialization declaration for a member of a class |
3401 | // template or a member template that ap- pears in namespace scope, the |
3402 | // member template and some of its enclosing class templates may remain |
3403 | // unspecialized, except that the declaration shall not explicitly |
3404 | // specialize a class member template if its en- closing class templates |
3405 | // are not explicitly specialized as well. |
3406 | if (ParamLists.back()->size() == 0 && |
3407 | CheckExplicitSpecialization(ParamLists[ParamIdx]->getSourceRange(), |
3408 | false)) |
3409 | return nullptr; |
3410 | |
3411 | // Return the last template parameter list, which corresponds to the |
3412 | // entity being declared. |
3413 | return ParamLists.back(); |
3414 | } |
3415 | |
3416 | void Sema::NoteAllFoundTemplates(TemplateName Name) { |
3417 | if (TemplateDecl *Template = Name.getAsTemplateDecl()) { |
3418 | Diag(Template->getLocation(), diag::note_template_declared_here) |
3419 | << (isa<FunctionTemplateDecl>(Template) |
3420 | ? 0 |
3421 | : isa<ClassTemplateDecl>(Template) |
3422 | ? 1 |
3423 | : isa<VarTemplateDecl>(Template) |
3424 | ? 2 |
3425 | : isa<TypeAliasTemplateDecl>(Template) ? 3 : 4) |
3426 | << Template->getDeclName(); |
3427 | return; |
3428 | } |
3429 | |
3430 | if (OverloadedTemplateStorage *OST = Name.getAsOverloadedTemplate()) { |
3431 | for (OverloadedTemplateStorage::iterator I = OST->begin(), |
3432 | IEnd = OST->end(); |
3433 | I != IEnd; ++I) |
3434 | Diag((*I)->getLocation(), diag::note_template_declared_here) |
3435 | << 0 << (*I)->getDeclName(); |
3436 | |
3437 | return; |
3438 | } |
3439 | } |
3440 | |
3441 | static QualType |
3442 | checkBuiltinTemplateIdType(Sema &SemaRef, BuiltinTemplateDecl *BTD, |
3443 | const SmallVectorImpl<TemplateArgument> &Converted, |
3444 | SourceLocation TemplateLoc, |
3445 | TemplateArgumentListInfo &TemplateArgs) { |
3446 | ASTContext &Context = SemaRef.getASTContext(); |
3447 | switch (BTD->getBuiltinTemplateKind()) { |
3448 | case BTK__make_integer_seq: { |
3449 | // Specializations of __make_integer_seq<S, T, N> are treated like |
3450 | // S<T, 0, ..., N-1>. |
3451 | |
3452 | // C++14 [inteseq.intseq]p1: |
3453 | // T shall be an integer type. |
3454 | if (!Converted[1].getAsType()->isIntegralType(Context)) { |
3455 | SemaRef.Diag(TemplateArgs[1].getLocation(), |
3456 | diag::err_integer_sequence_integral_element_type); |
3457 | return QualType(); |
3458 | } |
3459 | |
3460 | // C++14 [inteseq.make]p1: |
3461 | // If N is negative the program is ill-formed. |
3462 | TemplateArgument NumArgsArg = Converted[2]; |
3463 | llvm::APSInt NumArgs = NumArgsArg.getAsIntegral(); |
3464 | if (NumArgs < 0) { |
3465 | SemaRef.Diag(TemplateArgs[2].getLocation(), |
3466 | diag::err_integer_sequence_negative_length); |
3467 | return QualType(); |
3468 | } |
3469 | |
3470 | QualType ArgTy = NumArgsArg.getIntegralType(); |
3471 | TemplateArgumentListInfo SyntheticTemplateArgs; |
3472 | // The type argument gets reused as the first template argument in the |
3473 | // synthetic template argument list. |
3474 | SyntheticTemplateArgs.addArgument(TemplateArgs[1]); |
3475 | // Expand N into 0 ... N-1. |
3476 | for (llvm::APSInt I(NumArgs.getBitWidth(), NumArgs.isUnsigned()); |
3477 | I < NumArgs; ++I) { |
3478 | TemplateArgument TA(Context, I, ArgTy); |
3479 | SyntheticTemplateArgs.addArgument(SemaRef.getTrivialTemplateArgumentLoc( |
3480 | TA, ArgTy, TemplateArgs[2].getLocation())); |
3481 | } |
3482 | // The first template argument will be reused as the template decl that |
3483 | // our synthetic template arguments will be applied to. |
3484 | return SemaRef.CheckTemplateIdType(Converted[0].getAsTemplate(), |
3485 | TemplateLoc, SyntheticTemplateArgs); |
3486 | } |
3487 | |
3488 | case BTK__type_pack_element: |
3489 | // Specializations of |
3490 | // __type_pack_element<Index, T_1, ..., T_N> |
3491 | // are treated like T_Index. |
3492 | assert(Converted.size() == 2 &&((void)0) |
3493 | "__type_pack_element should be given an index and a parameter pack")((void)0); |
3494 | |
3495 | // If the Index is out of bounds, the program is ill-formed. |
3496 | TemplateArgument IndexArg = Converted[0], Ts = Converted[1]; |
3497 | llvm::APSInt Index = IndexArg.getAsIntegral(); |
3498 | assert(Index >= 0 && "the index used with __type_pack_element should be of "((void)0) |
3499 | "type std::size_t, and hence be non-negative")((void)0); |
3500 | if (Index >= Ts.pack_size()) { |
3501 | SemaRef.Diag(TemplateArgs[0].getLocation(), |
3502 | diag::err_type_pack_element_out_of_bounds); |
3503 | return QualType(); |
3504 | } |
3505 | |
3506 | // We simply return the type at index `Index`. |
3507 | auto Nth = std::next(Ts.pack_begin(), Index.getExtValue()); |
3508 | return Nth->getAsType(); |
3509 | } |
3510 | llvm_unreachable("unexpected BuiltinTemplateDecl!")__builtin_unreachable(); |
3511 | } |
3512 | |
3513 | /// Determine whether this alias template is "enable_if_t". |
3514 | static bool isEnableIfAliasTemplate(TypeAliasTemplateDecl *AliasTemplate) { |
3515 | return AliasTemplate->getName().equals("enable_if_t"); |
3516 | } |
3517 | |
3518 | /// Collect all of the separable terms in the given condition, which |
3519 | /// might be a conjunction. |
3520 | /// |
3521 | /// FIXME: The right answer is to convert the logical expression into |
3522 | /// disjunctive normal form, so we can find the first failed term |
3523 | /// within each possible clause. |
3524 | static void collectConjunctionTerms(Expr *Clause, |
3525 | SmallVectorImpl<Expr *> &Terms) { |
3526 | if (auto BinOp = dyn_cast<BinaryOperator>(Clause->IgnoreParenImpCasts())) { |
3527 | if (BinOp->getOpcode() == BO_LAnd) { |
3528 | collectConjunctionTerms(BinOp->getLHS(), Terms); |
3529 | collectConjunctionTerms(BinOp->getRHS(), Terms); |
3530 | } |
3531 | |
3532 | return; |
3533 | } |
3534 | |
3535 | Terms.push_back(Clause); |
3536 | } |
3537 | |
3538 | // The ranges-v3 library uses an odd pattern of a top-level "||" with |
3539 | // a left-hand side that is value-dependent but never true. Identify |
3540 | // the idiom and ignore that term. |
3541 | static Expr *lookThroughRangesV3Condition(Preprocessor &PP, Expr *Cond) { |
3542 | // Top-level '||'. |
3543 | auto *BinOp = dyn_cast<BinaryOperator>(Cond->IgnoreParenImpCasts()); |
3544 | if (!BinOp) return Cond; |
3545 | |
3546 | if (BinOp->getOpcode() != BO_LOr) return Cond; |
3547 | |
3548 | // With an inner '==' that has a literal on the right-hand side. |
3549 | Expr *LHS = BinOp->getLHS(); |
3550 | auto *InnerBinOp = dyn_cast<BinaryOperator>(LHS->IgnoreParenImpCasts()); |
3551 | if (!InnerBinOp) return Cond; |
3552 | |
3553 | if (InnerBinOp->getOpcode() != BO_EQ || |
3554 | !isa<IntegerLiteral>(InnerBinOp->getRHS())) |
3555 | return Cond; |
3556 | |
3557 | // If the inner binary operation came from a macro expansion named |
3558 | // CONCEPT_REQUIRES or CONCEPT_REQUIRES_, return the right-hand side |
3559 | // of the '||', which is the real, user-provided condition. |
3560 | SourceLocation Loc = InnerBinOp->getExprLoc(); |
3561 | if (!Loc.isMacroID()) return Cond; |
3562 | |
3563 | StringRef MacroName = PP.getImmediateMacroName(Loc); |
3564 | if (MacroName == "CONCEPT_REQUIRES" || MacroName == "CONCEPT_REQUIRES_") |
3565 | return BinOp->getRHS(); |
3566 | |
3567 | return Cond; |
3568 | } |
3569 | |
3570 | namespace { |
3571 | |
3572 | // A PrinterHelper that prints more helpful diagnostics for some sub-expressions |
3573 | // within failing boolean expression, such as substituting template parameters |
3574 | // for actual types. |
3575 | class FailedBooleanConditionPrinterHelper : public PrinterHelper { |
3576 | public: |
3577 | explicit FailedBooleanConditionPrinterHelper(const PrintingPolicy &P) |
3578 | : Policy(P) {} |
3579 | |
3580 | bool handledStmt(Stmt *E, raw_ostream &OS) override { |
3581 | const auto *DR = dyn_cast<DeclRefExpr>(E); |
3582 | if (DR && DR->getQualifier()) { |
3583 | // If this is a qualified name, expand the template arguments in nested |
3584 | // qualifiers. |
3585 | DR->getQualifier()->print(OS, Policy, true); |
3586 | // Then print the decl itself. |
3587 | const ValueDecl *VD = DR->getDecl(); |
3588 | OS << VD->getName(); |
3589 | if (const auto *IV = dyn_cast<VarTemplateSpecializationDecl>(VD)) { |
3590 | // This is a template variable, print the expanded template arguments. |
3591 | printTemplateArgumentList( |
3592 | OS, IV->getTemplateArgs().asArray(), Policy, |
3593 | IV->getSpecializedTemplate()->getTemplateParameters()); |
3594 | } |
3595 | return true; |
3596 | } |
3597 | return false; |
3598 | } |
3599 | |
3600 | private: |
3601 | const PrintingPolicy Policy; |
3602 | }; |
3603 | |
3604 | } // end anonymous namespace |
3605 | |
3606 | std::pair<Expr *, std::string> |
3607 | Sema::findFailedBooleanCondition(Expr *Cond) { |
3608 | Cond = lookThroughRangesV3Condition(PP, Cond); |
3609 | |
3610 | // Separate out all of the terms in a conjunction. |
3611 | SmallVector<Expr *, 4> Terms; |
3612 | collectConjunctionTerms(Cond, Terms); |
3613 | |
3614 | // Determine which term failed. |
3615 | Expr *FailedCond = nullptr; |
3616 | for (Expr *Term : Terms) { |
3617 | Expr *TermAsWritten = Term->IgnoreParenImpCasts(); |
3618 | |
3619 | // Literals are uninteresting. |
3620 | if (isa<CXXBoolLiteralExpr>(TermAsWritten) || |
3621 | isa<IntegerLiteral>(TermAsWritten)) |
3622 | continue; |
3623 | |
3624 | // The initialization of the parameter from the argument is |
3625 | // a constant-evaluated context. |
3626 | EnterExpressionEvaluationContext ConstantEvaluated( |
3627 | *this, Sema::ExpressionEvaluationContext::ConstantEvaluated); |
3628 | |
3629 | bool Succeeded; |
3630 | if (Term->EvaluateAsBooleanCondition(Succeeded, Context) && |
3631 | !Succeeded) { |
3632 | FailedCond = TermAsWritten; |
3633 | break; |
3634 | } |
3635 | } |
3636 | if (!FailedCond) |
3637 | FailedCond = Cond->IgnoreParenImpCasts(); |
3638 | |
3639 | std::string Description; |
3640 | { |
3641 | llvm::raw_string_ostream Out(Description); |
3642 | PrintingPolicy Policy = getPrintingPolicy(); |
3643 | Policy.PrintCanonicalTypes = true; |
3644 | FailedBooleanConditionPrinterHelper Helper(Policy); |
3645 | FailedCond->printPretty(Out, &Helper, Policy, 0, "\n", nullptr); |
3646 | } |
3647 | return { FailedCond, Description }; |
3648 | } |
3649 | |
3650 | QualType Sema::CheckTemplateIdType(TemplateName Name, |
3651 | SourceLocation TemplateLoc, |
3652 | TemplateArgumentListInfo &TemplateArgs) { |
3653 | DependentTemplateName *DTN |
3654 | = Name.getUnderlying().getAsDependentTemplateName(); |
3655 | if (DTN && DTN->isIdentifier()) |
3656 | // When building a template-id where the template-name is dependent, |
3657 | // assume the template is a type template. Either our assumption is |
3658 | // correct, or the code is ill-formed and will be diagnosed when the |
3659 | // dependent name is substituted. |
3660 | return Context.getDependentTemplateSpecializationType(ETK_None, |
3661 | DTN->getQualifier(), |
3662 | DTN->getIdentifier(), |
3663 | TemplateArgs); |
3664 | |
3665 | if (Name.getAsAssumedTemplateName() && |
3666 | resolveAssumedTemplateNameAsType(/*Scope*/nullptr, Name, TemplateLoc)) |
3667 | return QualType(); |
3668 | |
3669 | TemplateDecl *Template = Name.getAsTemplateDecl(); |
3670 | if (!Template || isa<FunctionTemplateDecl>(Template) || |
3671 | isa<VarTemplateDecl>(Template) || isa<ConceptDecl>(Template)) { |
3672 | // We might have a substituted template template parameter pack. If so, |
3673 | // build a template specialization type for it. |
3674 | if (Name.getAsSubstTemplateTemplateParmPack()) |
3675 | return Context.getTemplateSpecializationType(Name, TemplateArgs); |
3676 | |
3677 | Diag(TemplateLoc, diag::err_template_id_not_a_type) |
3678 | << Name; |
3679 | NoteAllFoundTemplates(Name); |
3680 | return QualType(); |
3681 | } |
3682 | |
3683 | // Check that the template argument list is well-formed for this |
3684 | // template. |
3685 | SmallVector<TemplateArgument, 4> Converted; |
3686 | if (CheckTemplateArgumentList(Template, TemplateLoc, TemplateArgs, |
3687 | false, Converted, |
3688 | /*UpdateArgsWithConversion=*/true)) |
3689 | return QualType(); |
3690 | |
3691 | QualType CanonType; |
3692 | |
3693 | if (TypeAliasTemplateDecl *AliasTemplate = |
3694 | dyn_cast<TypeAliasTemplateDecl>(Template)) { |
3695 | |
3696 | // Find the canonical type for this type alias template specialization. |
3697 | TypeAliasDecl *Pattern = AliasTemplate->getTemplatedDecl(); |
3698 | if (Pattern->isInvalidDecl()) |
3699 | return QualType(); |
3700 | |
3701 | TemplateArgumentList StackTemplateArgs(TemplateArgumentList::OnStack, |
3702 | Converted); |
3703 | |
3704 | // Only substitute for the innermost template argument list. |
3705 | MultiLevelTemplateArgumentList TemplateArgLists; |
3706 | TemplateArgLists.addOuterTemplateArguments(&StackTemplateArgs); |
3707 | TemplateArgLists.addOuterRetainedLevels( |
3708 | AliasTemplate->getTemplateParameters()->getDepth()); |
3709 | |
3710 | LocalInstantiationScope Scope(*this); |
3711 | InstantiatingTemplate Inst(*this, TemplateLoc, Template); |
3712 | if (Inst.isInvalid()) |
3713 | return QualType(); |
3714 | |
3715 | CanonType = SubstType(Pattern->getUnderlyingType(), |
3716 | TemplateArgLists, AliasTemplate->getLocation(), |
3717 | AliasTemplate->getDeclName()); |
3718 | if (CanonType.isNull()) { |
3719 | // If this was enable_if and we failed to find the nested type |
3720 | // within enable_if in a SFINAE context, dig out the specific |
3721 | // enable_if condition that failed and present that instead. |
3722 | if (isEnableIfAliasTemplate(AliasTemplate)) { |
3723 | if (auto DeductionInfo = isSFINAEContext()) { |
3724 | if (*DeductionInfo && |
3725 | (*DeductionInfo)->hasSFINAEDiagnostic() && |
3726 | (*DeductionInfo)->peekSFINAEDiagnostic().second.getDiagID() == |
3727 | diag::err_typename_nested_not_found_enable_if && |
3728 | TemplateArgs[0].getArgument().getKind() |
3729 | == TemplateArgument::Expression) { |
3730 | Expr *FailedCond; |
3731 | std::string FailedDescription; |
3732 | std::tie(FailedCond, FailedDescription) = |
3733 | findFailedBooleanCondition(TemplateArgs[0].getSourceExpression()); |
3734 | |
3735 | // Remove the old SFINAE diagnostic. |
3736 | PartialDiagnosticAt OldDiag = |
3737 | {SourceLocation(), PartialDiagnostic::NullDiagnostic()}; |
3738 | (*DeductionInfo)->takeSFINAEDiagnostic(OldDiag); |
3739 | |
3740 | // Add a new SFINAE diagnostic specifying which condition |
3741 | // failed. |
3742 | (*DeductionInfo)->addSFINAEDiagnostic( |
3743 | OldDiag.first, |
3744 | PDiag(diag::err_typename_nested_not_found_requirement) |
3745 | << FailedDescription |
3746 | << FailedCond->getSourceRange()); |
3747 | } |
3748 | } |
3749 | } |
3750 | |
3751 | return QualType(); |
3752 | } |
3753 | } else if (Name.isDependent() || |
3754 | TemplateSpecializationType::anyDependentTemplateArguments( |
3755 | TemplateArgs, Converted)) { |
3756 | // This class template specialization is a dependent |
3757 | // type. Therefore, its canonical type is another class template |
3758 | // specialization type that contains all of the converted |
3759 | // arguments in canonical form. This ensures that, e.g., A<T> and |
3760 | // A<T, T> have identical types when A is declared as: |
3761 | // |
3762 | // template<typename T, typename U = T> struct A; |
3763 | CanonType = Context.getCanonicalTemplateSpecializationType(Name, Converted); |
3764 | |
3765 | // This might work out to be a current instantiation, in which |
3766 | // case the canonical type needs to be the InjectedClassNameType. |
3767 | // |
3768 | // TODO: in theory this could be a simple hashtable lookup; most |
3769 | // changes to CurContext don't change the set of current |
3770 | // instantiations. |
3771 | if (isa<ClassTemplateDecl>(Template)) { |
3772 | for (DeclContext *Ctx = CurContext; Ctx; Ctx = Ctx->getLookupParent()) { |
3773 | // If we get out to a namespace, we're done. |
3774 | if (Ctx->isFileContext()) break; |
3775 | |
3776 | // If this isn't a record, keep looking. |
3777 | CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Ctx); |
3778 | if (!Record) continue; |
3779 | |
3780 | // Look for one of the two cases with InjectedClassNameTypes |
3781 | // and check whether it's the same template. |
3782 | if (!isa<ClassTemplatePartialSpecializationDecl>(Record) && |
3783 | !Record->getDescribedClassTemplate()) |
3784 | continue; |
3785 | |
3786 | // Fetch the injected class name type and check whether its |
3787 | // injected type is equal to the type we just built. |
3788 | QualType ICNT = Context.getTypeDeclType(Record); |
3789 | QualType Injected = cast<InjectedClassNameType>(ICNT) |
3790 | ->getInjectedSpecializationType(); |
3791 | |
3792 | if (CanonType != Injected->getCanonicalTypeInternal()) |
3793 | continue; |
3794 | |
3795 | // If so, the canonical type of this TST is the injected |
3796 | // class name type of the record we just found. |
3797 | assert(ICNT.isCanonical())((void)0); |
3798 | CanonType = ICNT; |
3799 | break; |
3800 | } |
3801 | } |
3802 | } else if (ClassTemplateDecl *ClassTemplate |
3803 | = dyn_cast<ClassTemplateDecl>(Template)) { |
3804 | // Find the class template specialization declaration that |
3805 | // corresponds to these arguments. |
3806 | void *InsertPos = nullptr; |
3807 | ClassTemplateSpecializationDecl *Decl |
3808 | = ClassTemplate->findSpecialization(Converted, InsertPos); |
3809 | if (!Decl) { |
3810 | // This is the first time we have referenced this class template |
3811 | // specialization. Create the canonical declaration and add it to |
3812 | // the set of specializations. |
3813 | Decl = ClassTemplateSpecializationDecl::Create( |
3814 | Context, ClassTemplate->getTemplatedDecl()->getTagKind(), |
3815 | ClassTemplate->getDeclContext(), |
3816 | ClassTemplate->getTemplatedDecl()->getBeginLoc(), |
3817 | ClassTemplate->getLocation(), ClassTemplate, Converted, nullptr); |
3818 | ClassTemplate->AddSpecialization(Decl, InsertPos); |
3819 | if (ClassTemplate->isOutOfLine()) |
3820 | Decl->setLexicalDeclContext(ClassTemplate->getLexicalDeclContext()); |
3821 | } |
3822 | |
3823 | if (Decl->getSpecializationKind() == TSK_Undeclared && |
3824 | ClassTemplate->getTemplatedDecl()->hasAttrs()) { |
3825 | InstantiatingTemplate Inst(*this, TemplateLoc, Decl); |
3826 | if (!Inst.isInvalid()) { |
3827 | MultiLevelTemplateArgumentList TemplateArgLists; |
3828 | TemplateArgLists.addOuterTemplateArguments(Converted); |
3829 | InstantiateAttrsForDecl(TemplateArgLists, |
3830 | ClassTemplate->getTemplatedDecl(), Decl); |
3831 | } |
3832 | } |
3833 | |
3834 | // Diagnose uses of this specialization. |
3835 | (void)DiagnoseUseOfDecl(Decl, TemplateLoc); |
3836 | |
3837 | CanonType = Context.getTypeDeclType(Decl); |
3838 | assert(isa<RecordType>(CanonType) &&((void)0) |
3839 | "type of non-dependent specialization is not a RecordType")((void)0); |
3840 | } else if (auto *BTD = dyn_cast<BuiltinTemplateDecl>(Template)) { |
3841 | CanonType = checkBuiltinTemplateIdType(*this, BTD, Converted, TemplateLoc, |
3842 | TemplateArgs); |
3843 | } |
3844 | |
3845 | // Build the fully-sugared type for this class template |
3846 | // specialization, which refers back to the class template |
3847 | // specialization we created or found. |
3848 | return Context.getTemplateSpecializationType(Name, TemplateArgs, CanonType); |
3849 | } |
3850 | |
3851 | void Sema::ActOnUndeclaredTypeTemplateName(Scope *S, TemplateTy &ParsedName, |
3852 | TemplateNameKind &TNK, |
3853 | SourceLocation NameLoc, |
3854 | IdentifierInfo *&II) { |
3855 | assert(TNK == TNK_Undeclared_template && "not an undeclared template name")((void)0); |
3856 | |
3857 | TemplateName Name = ParsedName.get(); |
3858 | auto *ATN = Name.getAsAssumedTemplateName(); |
3859 | assert(ATN && "not an assumed template name")((void)0); |
3860 | II = ATN->getDeclName().getAsIdentifierInfo(); |
3861 | |
3862 | if (!resolveAssumedTemplateNameAsType(S, Name, NameLoc, /*Diagnose*/false)) { |
3863 | // Resolved to a type template name. |
3864 | ParsedName = TemplateTy::make(Name); |
3865 | TNK = TNK_Type_template; |
3866 | } |
3867 | } |
3868 | |
3869 | bool Sema::resolveAssumedTemplateNameAsType(Scope *S, TemplateName &Name, |
3870 | SourceLocation NameLoc, |
3871 | bool Diagnose) { |
3872 | // We assumed this undeclared identifier to be an (ADL-only) function |
3873 | // template name, but it was used in a context where a type was required. |
3874 | // Try to typo-correct it now. |
3875 | AssumedTemplateStorage *ATN = Name.getAsAssumedTemplateName(); |
3876 | assert(ATN && "not an assumed template name")((void)0); |
3877 | |
3878 | LookupResult R(*this, ATN->getDeclName(), NameLoc, LookupOrdinaryName); |
3879 | struct CandidateCallback : CorrectionCandidateCallback { |
3880 | bool ValidateCandidate(const TypoCorrection &TC) override { |
3881 | return TC.getCorrectionDecl() && |
3882 | getAsTypeTemplateDecl(TC.getCorrectionDecl()); |
3883 | } |
3884 | std::unique_ptr<CorrectionCandidateCallback> clone() override { |
3885 | return std::make_unique<CandidateCallback>(*this); |
3886 | } |
3887 | } FilterCCC; |
3888 | |
3889 | TypoCorrection Corrected = |
3890 | CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, nullptr, |
3891 | FilterCCC, CTK_ErrorRecovery); |
3892 | if (Corrected && Corrected.getFoundDecl()) { |
3893 | diagnoseTypo(Corrected, PDiag(diag::err_no_template_suggest) |
3894 | << ATN->getDeclName()); |
3895 | Name = TemplateName(Corrected.getCorrectionDeclAs<TemplateDecl>()); |
3896 | return false; |
3897 | } |
3898 | |
3899 | if (Diagnose) |
3900 | Diag(R.getNameLoc(), diag::err_no_template) << R.getLookupName(); |
3901 | return true; |
3902 | } |
3903 | |
3904 | TypeResult Sema::ActOnTemplateIdType( |
3905 | Scope *S, CXXScopeSpec &SS, SourceLocation TemplateKWLoc, |
3906 | TemplateTy TemplateD, IdentifierInfo *TemplateII, |
3907 | SourceLocation TemplateIILoc, SourceLocation LAngleLoc, |
3908 | ASTTemplateArgsPtr TemplateArgsIn, SourceLocation RAngleLoc, |
3909 | bool IsCtorOrDtorName, bool IsClassName) { |
3910 | if (SS.isInvalid()) |
3911 | return true; |
3912 | |
3913 | if (!IsCtorOrDtorName && !IsClassName && SS.isSet()) { |
3914 | DeclContext *LookupCtx = computeDeclContext(SS, /*EnteringContext*/false); |
3915 | |
3916 | // C++ [temp.res]p3: |
3917 | // A qualified-id that refers to a type and in which the |
3918 | // nested-name-specifier depends on a template-parameter (14.6.2) |
3919 | // shall be prefixed by the keyword typename to indicate that the |
3920 | // qualified-id denotes a type, forming an |
3921 | // elaborated-type-specifier (7.1.5.3). |
3922 | if (!LookupCtx && isDependentScopeSpecifier(SS)) { |
3923 | Diag(SS.getBeginLoc(), diag::err_typename_missing_template) |
3924 | << SS.getScopeRep() << TemplateII->getName(); |
3925 | // Recover as if 'typename' were specified. |
3926 | // FIXME: This is not quite correct recovery as we don't transform SS |
3927 | // into the corresponding dependent form (and we don't diagnose missing |
3928 | // 'template' keywords within SS as a result). |
3929 | return ActOnTypenameType(nullptr, SourceLocation(), SS, TemplateKWLoc, |
3930 | TemplateD, TemplateII, TemplateIILoc, LAngleLoc, |
3931 | TemplateArgsIn, RAngleLoc); |
3932 | } |
3933 | |
3934 | // Per C++ [class.qual]p2, if the template-id was an injected-class-name, |
3935 | // it's not actually allowed to be used as a type in most cases. Because |
3936 | // we annotate it before we know whether it's valid, we have to check for |
3937 | // this case here. |
3938 | auto *LookupRD = dyn_cast_or_null<CXXRecordDecl>(LookupCtx); |
3939 | if (LookupRD && LookupRD->getIdentifier() == TemplateII) { |
3940 | Diag(TemplateIILoc, |
3941 | TemplateKWLoc.isInvalid() |
3942 | ? diag::err_out_of_line_qualified_id_type_names_constructor |
3943 | : diag::ext_out_of_line_qualified_id_type_names_constructor) |
3944 | << TemplateII << 0 /*injected-class-name used as template name*/ |
3945 | << 1 /*if any keyword was present, it was 'template'*/; |
3946 | } |
3947 | } |
3948 | |
3949 | TemplateName Template = TemplateD.get(); |
3950 | if (Template.getAsAssumedTemplateName() && |
3951 | resolveAssumedTemplateNameAsType(S, Template, TemplateIILoc)) |
3952 | return true; |
3953 | |
3954 | // Translate the parser's template argument list in our AST format. |
3955 | TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc); |
3956 | translateTemplateArguments(TemplateArgsIn, TemplateArgs); |
3957 | |
3958 | if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) { |
3959 | QualType T |
3960 | = Context.getDependentTemplateSpecializationType(ETK_None, |
3961 | DTN->getQualifier(), |
3962 | DTN->getIdentifier(), |
3963 | TemplateArgs); |
3964 | // Build type-source information. |
3965 | TypeLocBuilder TLB; |
3966 | DependentTemplateSpecializationTypeLoc SpecTL |
3967 | = TLB.push<DependentTemplateSpecializationTypeLoc>(T); |
3968 | SpecTL.setElaboratedKeywordLoc(SourceLocation()); |
3969 | SpecTL.setQualifierLoc(SS.getWithLocInContext(Context)); |
3970 | SpecTL.setTemplateKeywordLoc(TemplateKWLoc); |
3971 | SpecTL.setTemplateNameLoc(TemplateIILoc); |
3972 | SpecTL.setLAngleLoc(LAngleLoc); |
3973 | SpecTL.setRAngleLoc(RAngleLoc); |
3974 | for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I) |
3975 | SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo()); |
3976 | return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T)); |
3977 | } |
3978 | |
3979 | QualType Result = CheckTemplateIdType(Template, TemplateIILoc, TemplateArgs); |
3980 | if (Result.isNull()) |
3981 | return true; |
3982 | |
3983 | // Build type-source information. |
3984 | TypeLocBuilder TLB; |
3985 | TemplateSpecializationTypeLoc SpecTL |
3986 | = TLB.push<TemplateSpecializationTypeLoc>(Result); |
3987 | SpecTL.setTemplateKeywordLoc(TemplateKWLoc); |
3988 | SpecTL.setTemplateNameLoc(TemplateIILoc); |
3989 | SpecTL.setLAngleLoc(LAngleLoc); |
3990 | SpecTL.setRAngleLoc(RAngleLoc); |
3991 | for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i) |
3992 | SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo()); |
3993 | |
3994 | // NOTE: avoid constructing an ElaboratedTypeLoc if this is a |
3995 | // constructor or destructor name (in such a case, the scope specifier |
3996 | // will be attached to the enclosing Decl or Expr node). |
3997 | if (SS.isNotEmpty() && !IsCtorOrDtorName) { |
3998 | // Create an elaborated-type-specifier containing the nested-name-specifier. |
3999 | Result = Context.getElaboratedType(ETK_None, SS.getScopeRep(), Result); |
4000 | ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result); |
4001 | ElabTL.setElaboratedKeywordLoc(SourceLocation()); |
4002 | ElabTL.setQualifierLoc(SS.getWithLocInContext(Context)); |
4003 | } |
4004 | |
4005 | return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result)); |
4006 | } |
4007 | |
4008 | TypeResult Sema::ActOnTagTemplateIdType(TagUseKind TUK, |
4009 | TypeSpecifierType TagSpec, |
4010 | SourceLocation TagLoc, |
4011 | CXXScopeSpec &SS, |
4012 | SourceLocation TemplateKWLoc, |
4013 | TemplateTy TemplateD, |
4014 | SourceLocation TemplateLoc, |
4015 | SourceLocation LAngleLoc, |
4016 | ASTTemplateArgsPtr TemplateArgsIn, |
4017 | SourceLocation RAngleLoc) { |
4018 | if (SS.isInvalid()) |
4019 | return TypeResult(true); |
4020 | |
4021 | TemplateName Template = TemplateD.get(); |
4022 | |
4023 | // Translate the parser's template argument list in our AST format. |
4024 | TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc); |
4025 | translateTemplateArguments(TemplateArgsIn, TemplateArgs); |
4026 | |
4027 | // Determine the tag kind |
4028 | TagTypeKind TagKind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); |
4029 | ElaboratedTypeKeyword Keyword |
4030 | = TypeWithKeyword::getKeywordForTagTypeKind(TagKind); |
4031 | |
4032 | if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) { |
4033 | QualType T = Context.getDependentTemplateSpecializationType(Keyword, |
4034 | DTN->getQualifier(), |
4035 | DTN->getIdentifier(), |
4036 | TemplateArgs); |
4037 | |
4038 | // Build type-source information. |
4039 | TypeLocBuilder TLB; |
4040 | DependentTemplateSpecializationTypeLoc SpecTL |
4041 | = TLB.push<DependentTemplateSpecializationTypeLoc>(T); |
4042 | SpecTL.setElaboratedKeywordLoc(TagLoc); |
4043 | SpecTL.setQualifierLoc(SS.getWithLocInContext(Context)); |
4044 | SpecTL.setTemplateKeywordLoc(TemplateKWLoc); |
4045 | SpecTL.setTemplateNameLoc(TemplateLoc); |
4046 | SpecTL.setLAngleLoc(LAngleLoc); |
4047 | SpecTL.setRAngleLoc(RAngleLoc); |
4048 | for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I) |
4049 | SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo()); |
4050 | return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T)); |
4051 | } |
4052 | |
4053 | if (TypeAliasTemplateDecl *TAT = |
4054 | dyn_cast_or_null<TypeAliasTemplateDecl>(Template.getAsTemplateDecl())) { |
4055 | // C++0x [dcl.type.elab]p2: |
4056 | // If the identifier resolves to a typedef-name or the simple-template-id |
4057 | // resolves to an alias template specialization, the |
4058 | // elaborated-type-specifier is ill-formed. |
4059 | Diag(TemplateLoc, diag::err_tag_reference_non_tag) |
4060 | << TAT << NTK_TypeAliasTemplate << TagKind; |
4061 | Diag(TAT->getLocation(), diag::note_declared_at); |
4062 | } |
4063 | |
4064 | QualType Result = CheckTemplateIdType(Template, TemplateLoc, TemplateArgs); |
4065 | if (Result.isNull()) |
4066 | return TypeResult(true); |
4067 | |
4068 | // Check the tag kind |
4069 | if (const RecordType *RT = Result->getAs<RecordType>()) { |
4070 | RecordDecl *D = RT->getDecl(); |
4071 | |
4072 | IdentifierInfo *Id = D->getIdentifier(); |
4073 | assert(Id && "templated class must have an identifier")((void)0); |
4074 | |
4075 | if (!isAcceptableTagRedeclaration(D, TagKind, TUK == TUK_Definition, |
4076 | TagLoc, Id)) { |
4077 | Diag(TagLoc, diag::err_use_with_wrong_tag) |
4078 | << Result |
4079 | << FixItHint::CreateReplacement(SourceRange(TagLoc), D->getKindName()); |
4080 | Diag(D->getLocation(), diag::note_previous_use); |
4081 | } |
4082 | } |
4083 | |
4084 | // Provide source-location information for the template specialization. |
4085 | TypeLocBuilder TLB; |
4086 | TemplateSpecializationTypeLoc SpecTL |
4087 | = TLB.push<TemplateSpecializationTypeLoc>(Result); |
4088 | SpecTL.setTemplateKeywordLoc(TemplateKWLoc); |
4089 | SpecTL.setTemplateNameLoc(TemplateLoc); |
4090 | SpecTL.setLAngleLoc(LAngleLoc); |
4091 | SpecTL.setRAngleLoc(RAngleLoc); |
4092 | for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i) |
4093 | SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo()); |
4094 | |
4095 | // Construct an elaborated type containing the nested-name-specifier (if any) |
4096 | // and tag keyword. |
4097 | Result = Context.getElaboratedType(Keyword, SS.getScopeRep(), Result); |
4098 | ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result); |
4099 | ElabTL.setElaboratedKeywordLoc(TagLoc); |
4100 | ElabTL.setQualifierLoc(SS.getWithLocInContext(Context)); |
4101 | return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result)); |
4102 | } |
4103 | |
4104 | static bool CheckTemplateSpecializationScope(Sema &S, NamedDecl *Specialized, |
4105 | NamedDecl *PrevDecl, |
4106 | SourceLocation Loc, |
4107 | bool IsPartialSpecialization); |
4108 | |
4109 | static TemplateSpecializationKind getTemplateSpecializationKind(Decl *D); |
4110 | |
4111 | static bool isTemplateArgumentTemplateParameter( |
4112 | const TemplateArgument &Arg, unsigned Depth, unsigned Index) { |
4113 | switch (Arg.getKind()) { |
4114 | case TemplateArgument::Null: |
4115 | case TemplateArgument::NullPtr: |
4116 | case TemplateArgument::Integral: |
4117 | case TemplateArgument::Declaration: |
4118 | case TemplateArgument::Pack: |
4119 | case TemplateArgument::TemplateExpansion: |
4120 | return false; |
4121 | |
4122 | case TemplateArgument::Type: { |
4123 | QualType Type = Arg.getAsType(); |
4124 | const TemplateTypeParmType *TPT = |
4125 | Arg.getAsType()->getAs<TemplateTypeParmType>(); |
4126 | return TPT && !Type.hasQualifiers() && |
4127 | TPT->getDepth() == Depth && TPT->getIndex() == Index; |
4128 | } |
4129 | |
4130 | case TemplateArgument::Expression: { |
4131 | DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Arg.getAsExpr()); |
4132 | if (!DRE || !DRE->getDecl()) |
4133 | return false; |
4134 | const NonTypeTemplateParmDecl *NTTP = |
4135 | dyn_cast<NonTypeTemplateParmDecl>(DRE->getDecl()); |
4136 | return NTTP && NTTP->getDepth() == Depth && NTTP->getIndex() == Index; |
4137 | } |
4138 | |
4139 | case TemplateArgument::Template: |
4140 | const TemplateTemplateParmDecl *TTP = |
4141 | dyn_cast_or_null<TemplateTemplateParmDecl>( |
4142 | Arg.getAsTemplateOrTemplatePattern().getAsTemplateDecl()); |
4143 | return TTP && TTP->getDepth() == Depth && TTP->getIndex() == Index; |
4144 | } |
4145 | llvm_unreachable("unexpected kind of template argument")__builtin_unreachable(); |
4146 | } |
4147 | |
4148 | static bool isSameAsPrimaryTemplate(TemplateParameterList *Params, |
4149 | ArrayRef<TemplateArgument> Args) { |
4150 | if (Params->size() != Args.size()) |
4151 | return false; |
4152 | |
4153 | unsigned Depth = Params->getDepth(); |
4154 | |
4155 | for (unsigned I = 0, N = Args.size(); I != N; ++I) { |
4156 | TemplateArgument Arg = Args[I]; |
4157 | |
4158 | // If the parameter is a pack expansion, the argument must be a pack |
4159 | // whose only element is a pack expansion. |
4160 | if (Params->getParam(I)->isParameterPack()) { |
4161 | if (Arg.getKind() != TemplateArgument::Pack || Arg.pack_size() != 1 || |
4162 | !Arg.pack_begin()->isPackExpansion()) |
4163 | return false; |
4164 | Arg = Arg.pack_begin()->getPackExpansionPattern(); |
4165 | } |
4166 | |
4167 | if (!isTemplateArgumentTemplateParameter(Arg, Depth, I)) |
4168 | return false; |
4169 | } |
4170 | |
4171 | return true; |
4172 | } |
4173 | |
4174 | template<typename PartialSpecDecl> |
4175 | static void checkMoreSpecializedThanPrimary(Sema &S, PartialSpecDecl *Partial) { |
4176 | if (Partial->getDeclContext()->isDependentContext()) |
4177 | return; |
4178 | |
4179 | // FIXME: Get the TDK from deduction in order to provide better diagnostics |
4180 | // for non-substitution-failure issues? |
4181 | TemplateDeductionInfo Info(Partial->getLocation()); |
4182 | if (S.isMoreSpecializedThanPrimary(Partial, Info)) |
4183 | return; |
4184 | |
4185 | auto *Template = Partial->getSpecializedTemplate(); |
4186 | S.Diag(Partial->getLocation(), |
4187 | diag::ext_partial_spec_not_more_specialized_than_primary) |
4188 | << isa<VarTemplateDecl>(Template); |
4189 | |
4190 | if (Info.hasSFINAEDiagnostic()) { |
4191 | PartialDiagnosticAt Diag = {SourceLocation(), |
4192 | PartialDiagnostic::NullDiagnostic()}; |
4193 | Info.takeSFINAEDiagnostic(Diag); |
4194 | SmallString<128> SFINAEArgString; |
4195 | Diag.second.EmitToString(S.getDiagnostics(), SFINAEArgString); |
4196 | S.Diag(Diag.first, |
4197 | diag::note_partial_spec_not_more_specialized_than_primary) |
4198 | << SFINAEArgString; |
4199 | } |
4200 | |
4201 | S.Diag(Template->getLocation(), diag::note_template_decl_here); |
4202 | SmallVector<const Expr *, 3> PartialAC, TemplateAC; |
4203 | Template->getAssociatedConstraints(TemplateAC); |
4204 | Partial->getAssociatedConstraints(PartialAC); |
4205 | S.MaybeEmitAmbiguousAtomicConstraintsDiagnostic(Partial, PartialAC, Template, |
4206 | TemplateAC); |
4207 | } |
4208 | |
4209 | static void |
4210 | noteNonDeducibleParameters(Sema &S, TemplateParameterList *TemplateParams, |
4211 | const llvm::SmallBitVector &DeducibleParams) { |
4212 | for (unsigned I = 0, N = DeducibleParams.size(); I != N; ++I) { |
4213 | if (!DeducibleParams[I]) { |
4214 | NamedDecl *Param = TemplateParams->getParam(I); |
4215 | if (Param->getDeclName()) |
4216 | S.Diag(Param->getLocation(), diag::note_non_deducible_parameter) |
4217 | << Param->getDeclName(); |
4218 | else |
4219 | S.Diag(Param->getLocation(), diag::note_non_deducible_parameter) |
4220 | << "(anonymous)"; |
4221 | } |
4222 | } |
4223 | } |
4224 | |
4225 | |
4226 | template<typename PartialSpecDecl> |
4227 | static void checkTemplatePartialSpecialization(Sema &S, |
4228 | PartialSpecDecl *Partial) { |
4229 | // C++1z [temp.class.spec]p8: (DR1495) |
4230 | // - The specialization shall be more specialized than the primary |
4231 | // template (14.5.5.2). |
4232 | checkMoreSpecializedThanPrimary(S, Partial); |
4233 | |
4234 | // C++ [temp.class.spec]p8: (DR1315) |
4235 | // - Each template-parameter shall appear at least once in the |
4236 | // template-id outside a non-deduced context. |
4237 | // C++1z [temp.class.spec.match]p3 (P0127R2) |
4238 | // If the template arguments of a partial specialization cannot be |
4239 | // deduced because of the structure of its template-parameter-list |
4240 | // and the template-id, the program is ill-formed. |
4241 | auto *TemplateParams = Partial->getTemplateParameters(); |
4242 | llvm::SmallBitVector DeducibleParams(TemplateParams->size()); |
4243 | S.MarkUsedTemplateParameters(Partial->getTemplateArgs(), true, |
4244 | TemplateParams->getDepth(), DeducibleParams); |
4245 | |
4246 | if (!DeducibleParams.all()) { |
4247 | unsigned NumNonDeducible = DeducibleParams.size() - DeducibleParams.count(); |
4248 | S.Diag(Partial->getLocation(), diag::ext_partial_specs_not_deducible) |
4249 | << isa<VarTemplatePartialSpecializationDecl>(Partial) |
4250 | << (NumNonDeducible > 1) |
4251 | << SourceRange(Partial->getLocation(), |
4252 | Partial->getTemplateArgsAsWritten()->RAngleLoc); |
4253 | noteNonDeducibleParameters(S, TemplateParams, DeducibleParams); |
4254 | } |
4255 | } |
4256 | |
4257 | void Sema::CheckTemplatePartialSpecialization( |
4258 | ClassTemplatePartialSpecializationDecl *Partial) { |
4259 | checkTemplatePartialSpecialization(*this, Partial); |
4260 | } |
4261 | |
4262 | void Sema::CheckTemplatePartialSpecialization( |
4263 | VarTemplatePartialSpecializationDecl *Partial) { |
4264 | checkTemplatePartialSpecialization(*this, Partial); |
4265 | } |
4266 | |
4267 | void Sema::CheckDeductionGuideTemplate(FunctionTemplateDecl *TD) { |
4268 | // C++1z [temp.param]p11: |
4269 | // A template parameter of a deduction guide template that does not have a |
4270 | // default-argument shall be deducible from the parameter-type-list of the |
4271 | // deduction guide template. |
4272 | auto *TemplateParams = TD->getTemplateParameters(); |
4273 | llvm::SmallBitVector DeducibleParams(TemplateParams->size()); |
4274 | MarkDeducedTemplateParameters(TD, DeducibleParams); |
4275 | for (unsigned I = 0; I != TemplateParams->size(); ++I) { |
4276 | // A parameter pack is deducible (to an empty pack). |
4277 | auto *Param = TemplateParams->getParam(I); |
4278 | if (Param->isParameterPack() || hasVisibleDefaultArgument(Param)) |
4279 | DeducibleParams[I] = true; |
4280 | } |
4281 | |
4282 | if (!DeducibleParams.all()) { |
4283 | unsigned NumNonDeducible = DeducibleParams.size() - DeducibleParams.count(); |
4284 | Diag(TD->getLocation(), diag::err_deduction_guide_template_not_deducible) |
4285 | << (NumNonDeducible > 1); |
4286 | noteNonDeducibleParameters(*this, TemplateParams, DeducibleParams); |
4287 | } |
4288 | } |
4289 | |
4290 | DeclResult Sema::ActOnVarTemplateSpecialization( |
4291 | Scope *S, Declarator &D, TypeSourceInfo *DI, SourceLocation TemplateKWLoc, |
4292 | TemplateParameterList *TemplateParams, StorageClass SC, |
4293 | bool IsPartialSpecialization) { |
4294 | // D must be variable template id. |
4295 | assert(D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId &&((void)0) |
4296 | "Variable template specialization is declared with a template it.")((void)0); |
4297 | |
4298 | TemplateIdAnnotation *TemplateId = D.getName().TemplateId; |
4299 | TemplateArgumentListInfo TemplateArgs = |
4300 | makeTemplateArgumentListInfo(*this, *TemplateId); |
4301 | SourceLocation TemplateNameLoc = D.getIdentifierLoc(); |
4302 | SourceLocation LAngleLoc = TemplateId->LAngleLoc; |
4303 | SourceLocation RAngleLoc = TemplateId->RAngleLoc; |
4304 | |
4305 | TemplateName Name = TemplateId->Template.get(); |
4306 | |
4307 | // The template-id must name a variable template. |
4308 | VarTemplateDecl *VarTemplate = |
4309 | dyn_cast_or_null<VarTemplateDecl>(Name.getAsTemplateDecl()); |
4310 | if (!VarTemplate) { |
4311 | NamedDecl *FnTemplate; |
4312 | if (auto *OTS = Name.getAsOverloadedTemplate()) |
4313 | FnTemplate = *OTS->begin(); |
4314 | else |
4315 | FnTemplate = dyn_cast_or_null<FunctionTemplateDecl>(Name.getAsTemplateDecl()); |
4316 | if (FnTemplate) |
4317 | return Diag(D.getIdentifierLoc(), diag::err_var_spec_no_template_but_method) |
4318 | << FnTemplate->getDeclName(); |
4319 | return Diag(D.getIdentifierLoc(), diag::err_var_spec_no_template) |
4320 | << IsPartialSpecialization; |
4321 | } |
4322 | |
4323 | // Check for unexpanded parameter packs in any of the template arguments. |
4324 | for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) |
4325 | if (DiagnoseUnexpandedParameterPack(TemplateArgs[I], |
4326 | UPPC_PartialSpecialization)) |
4327 | return true; |
4328 | |
4329 | // Check that the template argument list is well-formed for this |
4330 | // template. |
4331 | SmallVector<TemplateArgument, 4> Converted; |
4332 | if (CheckTemplateArgumentList(VarTemplate, TemplateNameLoc, TemplateArgs, |
4333 | false, Converted, |
4334 | /*UpdateArgsWithConversion=*/true)) |
4335 | return true; |
4336 | |
4337 | // Find the variable template (partial) specialization declaration that |
4338 | // corresponds to these arguments. |
4339 | if (IsPartialSpecialization) { |
4340 | if (CheckTemplatePartialSpecializationArgs(TemplateNameLoc, VarTemplate, |
4341 | TemplateArgs.size(), Converted)) |
4342 | return true; |
4343 | |
4344 | // FIXME: Move these checks to CheckTemplatePartialSpecializationArgs so we |
4345 | // also do them during instantiation. |
4346 | if (!Name.isDependent() && |
4347 | !TemplateSpecializationType::anyDependentTemplateArguments(TemplateArgs, |
4348 | Converted)) { |
4349 | Diag(TemplateNameLoc, diag::err_partial_spec_fully_specialized) |
4350 | << VarTemplate->getDeclName(); |
4351 | IsPartialSpecialization = false; |
4352 | } |
4353 | |
4354 | if (isSameAsPrimaryTemplate(VarTemplate->getTemplateParameters(), |
4355 | Converted) && |
4356 | (!Context.getLangOpts().CPlusPlus20 || |
4357 | !TemplateParams->hasAssociatedConstraints())) { |
4358 | // C++ [temp.class.spec]p9b3: |
4359 | // |
4360 | // -- The argument list of the specialization shall not be identical |
4361 | // to the implicit argument list of the primary template. |
4362 | Diag(TemplateNameLoc, diag::err_partial_spec_args_match_primary_template) |
4363 | << /*variable template*/ 1 |
4364 | << /*is definition*/(SC != SC_Extern && !CurContext->isRecord()) |
4365 | << FixItHint::CreateRemoval(SourceRange(LAngleLoc, RAngleLoc)); |
4366 | // FIXME: Recover from this by treating the declaration as a redeclaration |
4367 | // of the primary template. |
4368 | return true; |
4369 | } |
4370 | } |
4371 | |
4372 | void *InsertPos = nullptr; |
4373 | VarTemplateSpecializationDecl *PrevDecl = nullptr; |
4374 | |
4375 | if (IsPartialSpecialization) |
4376 | PrevDecl = VarTemplate->findPartialSpecialization(Converted, TemplateParams, |
4377 | InsertPos); |
4378 | else |
4379 | PrevDecl = VarTemplate->findSpecialization(Converted, InsertPos); |
4380 | |
4381 | VarTemplateSpecializationDecl *Specialization = nullptr; |
4382 | |
4383 | // Check whether we can declare a variable template specialization in |
4384 | // the current scope. |
4385 | if (CheckTemplateSpecializationScope(*this, VarTemplate, PrevDecl, |
4386 | TemplateNameLoc, |
4387 | IsPartialSpecialization)) |
4388 | return true; |
4389 | |
4390 | if (PrevDecl && PrevDecl->getSpecializationKind() == TSK_Undeclared) { |
4391 | // Since the only prior variable template specialization with these |
4392 | // arguments was referenced but not declared, reuse that |
4393 | // declaration node as our own, updating its source location and |
4394 | // the list of outer template parameters to reflect our new declaration. |
4395 | Specialization = PrevDecl; |
4396 | Specialization->setLocation(TemplateNameLoc); |
4397 | PrevDecl = nullptr; |
4398 | } else if (IsPartialSpecialization) { |
4399 | // Create a new class template partial specialization declaration node. |
4400 | VarTemplatePartialSpecializationDecl *PrevPartial = |
4401 | cast_or_null<VarTemplatePartialSpecializationDecl>(PrevDecl); |
4402 | VarTemplatePartialSpecializationDecl *Partial = |
4403 | VarTemplatePartialSpecializationDecl::Create( |
4404 | Context, VarTemplate->getDeclContext(), TemplateKWLoc, |
4405 | TemplateNameLoc, TemplateParams, VarTemplate, DI->getType(), DI, SC, |
4406 | Converted, TemplateArgs); |
4407 | |
4408 | if (!PrevPartial) |
4409 | VarTemplate->AddPartialSpecialization(Partial, InsertPos); |
4410 | Specialization = Partial; |
4411 | |
4412 | // If we are providing an explicit specialization of a member variable |
4413 | // template specialization, make a note of that. |
4414 | if (PrevPartial && PrevPartial->getInstantiatedFromMember()) |
4415 | PrevPartial->setMemberSpecialization(); |
4416 | |
4417 | CheckTemplatePartialSpecialization(Partial); |
4418 | } else { |
4419 | // Create a new class template specialization declaration node for |
4420 | // this explicit specialization or friend declaration. |
4421 | Specialization = VarTemplateSpecializationDecl::Create( |
4422 | Context, VarTemplate->getDeclContext(), TemplateKWLoc, TemplateNameLoc, |
4423 | VarTemplate, DI->getType(), DI, SC, Converted); |
4424 | Specialization->setTemplateArgsInfo(TemplateArgs); |
4425 | |
4426 | if (!PrevDecl) |
4427 | VarTemplate->AddSpecialization(Specialization, InsertPos); |
4428 | } |
4429 | |
4430 | // C++ [temp.expl.spec]p6: |
4431 | // If a template, a member template or the member of a class template is |
4432 | // explicitly specialized then that specialization shall be declared |
4433 | // before the first use of that specialization that would cause an implicit |
4434 | // instantiation to take place, in every translation unit in which such a |
4435 | // use occurs; no diagnostic is required. |
4436 | if (PrevDecl && PrevDecl->getPointOfInstantiation().isValid()) { |
4437 | bool Okay = false; |
4438 | for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) { |
4439 | // Is there any previous explicit specialization declaration? |
4440 | if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) { |
4441 | Okay = true; |
4442 | break; |
4443 | } |
4444 | } |
4445 | |
4446 | if (!Okay) { |
4447 | SourceRange Range(TemplateNameLoc, RAngleLoc); |
4448 | Diag(TemplateNameLoc, diag::err_specialization_after_instantiation) |
4449 | << Name << Range; |
4450 | |
4451 | Diag(PrevDecl->getPointOfInstantiation(), |
4452 | diag::note_instantiation_required_here) |
4453 | << (PrevDecl->getTemplateSpecializationKind() != |
4454 | TSK_ImplicitInstantiation); |
4455 | return true; |
4456 | } |
4457 | } |
4458 | |
4459 | Specialization->setTemplateKeywordLoc(TemplateKWLoc); |
4460 | Specialization->setLexicalDeclContext(CurContext); |
4461 | |
4462 | // Add the specialization into its lexical context, so that it can |
4463 | // be seen when iterating through the list of declarations in that |
4464 | // context. However, specializations are not found by name lookup. |
4465 | CurContext->addDecl(Specialization); |
4466 | |
4467 | // Note that this is an explicit specialization. |
4468 | Specialization->setSpecializationKind(TSK_ExplicitSpecialization); |
4469 | |
4470 | if (PrevDecl) { |
4471 | // Check that this isn't a redefinition of this specialization, |
4472 | // merging with previous declarations. |
4473 | LookupResult PrevSpec(*this, GetNameForDeclarator(D), LookupOrdinaryName, |
4474 | forRedeclarationInCurContext()); |
4475 | PrevSpec.addDecl(PrevDecl); |
4476 | D.setRedeclaration(CheckVariableDeclaration(Specialization, PrevSpec)); |
4477 | } else if (Specialization->isStaticDataMember() && |
4478 | Specialization->isOutOfLine()) { |
4479 | Specialization->setAccess(VarTemplate->getAccess()); |
4480 | } |
4481 | |
4482 | return Specialization; |
4483 | } |
4484 | |
4485 | namespace { |
4486 | /// A partial specialization whose template arguments have matched |
4487 | /// a given template-id. |
4488 | struct PartialSpecMatchResult { |
4489 | VarTemplatePartialSpecializationDecl *Partial; |
4490 | TemplateArgumentList *Args; |
4491 | }; |
4492 | } // end anonymous namespace |
4493 | |
4494 | DeclResult |
4495 | Sema::CheckVarTemplateId(VarTemplateDecl *Template, SourceLocation TemplateLoc, |
4496 | SourceLocation TemplateNameLoc, |
4497 | const TemplateArgumentListInfo &TemplateArgs) { |
4498 | assert(Template && "A variable template id without template?")((void)0); |
4499 | |
4500 | // Check that the template argument list is well-formed for this template. |
4501 | SmallVector<TemplateArgument, 4> Converted; |
4502 | if (CheckTemplateArgumentList( |
4503 | Template, TemplateNameLoc, |
4504 | const_cast<TemplateArgumentListInfo &>(TemplateArgs), false, |
4505 | Converted, /*UpdateArgsWithConversion=*/true)) |
4506 | return true; |
4507 | |
4508 | // Produce a placeholder value if the specialization is dependent. |
4509 | if (Template->getDeclContext()->isDependentContext() || |
4510 | TemplateSpecializationType::anyDependentTemplateArguments(TemplateArgs, |
4511 | Converted)) |
4512 | return DeclResult(); |
4513 | |
4514 | // Find the variable template specialization declaration that |
4515 | // corresponds to these arguments. |
4516 | void *InsertPos = nullptr; |
4517 | if (VarTemplateSpecializationDecl *Spec = Template->findSpecialization( |
4518 | Converted, InsertPos)) { |
4519 | checkSpecializationVisibility(TemplateNameLoc, Spec); |
4520 | // If we already have a variable template specialization, return it. |
4521 | return Spec; |
4522 | } |
4523 | |
4524 | // This is the first time we have referenced this variable template |
4525 | // specialization. Create the canonical declaration and add it to |
4526 | // the set of specializations, based on the closest partial specialization |
4527 | // that it represents. That is, |
4528 | VarDecl *InstantiationPattern = Template->getTemplatedDecl(); |
4529 | TemplateArgumentList TemplateArgList(TemplateArgumentList::OnStack, |
4530 | Converted); |
4531 | TemplateArgumentList *InstantiationArgs = &TemplateArgList; |
4532 | bool AmbiguousPartialSpec = false; |
4533 | typedef PartialSpecMatchResult MatchResult; |
4534 | SmallVector<MatchResult, 4> Matched; |
4535 | SourceLocation PointOfInstantiation = TemplateNameLoc; |
4536 | TemplateSpecCandidateSet FailedCandidates(PointOfInstantiation, |
4537 | /*ForTakingAddress=*/false); |
4538 | |
4539 | // 1. Attempt to find the closest partial specialization that this |
4540 | // specializes, if any. |
4541 | // TODO: Unify with InstantiateClassTemplateSpecialization()? |
4542 | // Perhaps better after unification of DeduceTemplateArguments() and |
4543 | // getMoreSpecializedPartialSpecialization(). |
4544 | SmallVector<VarTemplatePartialSpecializationDecl *, 4> PartialSpecs; |
4545 | Template->getPartialSpecializations(PartialSpecs); |
4546 | |
4547 | for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) { |
4548 | VarTemplatePartialSpecializationDecl *Partial = PartialSpecs[I]; |
4549 | TemplateDeductionInfo Info(FailedCandidates.getLocation()); |
4550 | |
4551 | if (TemplateDeductionResult Result = |
4552 | DeduceTemplateArguments(Partial, TemplateArgList, Info)) { |
4553 | // Store the failed-deduction information for use in diagnostics, later. |
4554 | // TODO: Actually use the failed-deduction info? |
4555 | FailedCandidates.addCandidate().set( |
4556 | DeclAccessPair::make(Template, AS_public), Partial, |
4557 | MakeDeductionFailureInfo(Context, Result, Info)); |
4558 | (void)Result; |
4559 | } else { |
4560 | Matched.push_back(PartialSpecMatchResult()); |
4561 | Matched.back().Partial = Partial; |
4562 | Matched.back().Args = Info.take(); |
4563 | } |
4564 | } |
4565 | |
4566 | if (Matched.size() >= 1) { |
4567 | SmallVector<MatchResult, 4>::iterator Best = Matched.begin(); |
4568 | if (Matched.size() == 1) { |
4569 | // -- If exactly one matching specialization is found, the |
4570 | // instantiation is generated from that specialization. |
4571 | // We don't need to do anything for this. |
4572 | } else { |
4573 | // -- If more than one matching specialization is found, the |
4574 | // partial order rules (14.5.4.2) are used to determine |
4575 | // whether one of the specializations is more specialized |
4576 | // than the others. If none of the specializations is more |
4577 | // specialized than all of the other matching |
4578 | // specializations, then the use of the variable template is |
4579 | // ambiguous and the program is ill-formed. |
4580 | for (SmallVector<MatchResult, 4>::iterator P = Best + 1, |
4581 | PEnd = Matched.end(); |
4582 | P != PEnd; ++P) { |
4583 | if (getMoreSpecializedPartialSpecialization(P->Partial, Best->Partial, |
4584 | PointOfInstantiation) == |
4585 | P->Partial) |
4586 | Best = P; |
4587 | } |
4588 | |
4589 | // Determine if the best partial specialization is more specialized than |
4590 | // the others. |
4591 | for (SmallVector<MatchResult, 4>::iterator P = Matched.begin(), |
4592 | PEnd = Matched.end(); |
4593 | P != PEnd; ++P) { |
4594 | if (P != Best && getMoreSpecializedPartialSpecialization( |
4595 | P->Partial, Best->Partial, |
4596 | PointOfInstantiation) != Best->Partial) { |
4597 | AmbiguousPartialSpec = true; |
4598 | break; |
4599 | } |
4600 | } |
4601 | } |
4602 | |
4603 | // Instantiate using the best variable template partial specialization. |
4604 | InstantiationPattern = Best->Partial; |
4605 | InstantiationArgs = Best->Args; |
4606 | } else { |
4607 | // -- If no match is found, the instantiation is generated |
4608 | // from the primary template. |
4609 | // InstantiationPattern = Template->getTemplatedDecl(); |
4610 | } |
4611 | |
4612 | // 2. Create the canonical declaration. |
4613 | // Note that we do not instantiate a definition until we see an odr-use |
4614 | // in DoMarkVarDeclReferenced(). |
4615 | // FIXME: LateAttrs et al.? |
4616 | VarTemplateSpecializationDecl *Decl = BuildVarTemplateInstantiation( |
4617 | Template, InstantiationPattern, *InstantiationArgs, TemplateArgs, |
4618 | Converted, TemplateNameLoc /*, LateAttrs, StartingScope*/); |
4619 | if (!Decl) |
4620 | return true; |
4621 | |
4622 | if (AmbiguousPartialSpec) { |
4623 | // Partial ordering did not produce a clear winner. Complain. |
4624 | Decl->setInvalidDecl(); |
4625 | Diag(PointOfInstantiation, diag::err_partial_spec_ordering_ambiguous) |
4626 | << Decl; |
4627 | |
4628 | // Print the matching partial specializations. |
4629 | for (MatchResult P : Matched) |
4630 | Diag(P.Partial->getLocation(), diag::note_partial_spec_match) |
4631 | << getTemplateArgumentBindingsText(P.Partial->getTemplateParameters(), |
4632 | *P.Args); |
4633 | return true; |
4634 | } |
4635 | |
4636 | if (VarTemplatePartialSpecializationDecl *D = |
4637 | dyn_cast<VarTemplatePartialSpecializationDecl>(InstantiationPattern)) |
4638 | Decl->setInstantiationOf(D, InstantiationArgs); |
4639 | |
4640 | checkSpecializationVisibility(TemplateNameLoc, Decl); |
4641 | |
4642 | assert(Decl && "No variable template specialization?")((void)0); |
4643 | return Decl; |
4644 | } |
4645 | |
4646 | ExprResult |
4647 | Sema::CheckVarTemplateId(const CXXScopeSpec &SS, |
4648 | const DeclarationNameInfo &NameInfo, |
4649 | VarTemplateDecl *Template, SourceLocation TemplateLoc, |
4650 | const TemplateArgumentListInfo *TemplateArgs) { |
4651 | |
4652 | DeclResult Decl = CheckVarTemplateId(Template, TemplateLoc, NameInfo.getLoc(), |
4653 | *TemplateArgs); |
4654 | if (Decl.isInvalid()) |
4655 | return ExprError(); |
4656 | |
4657 | if (!Decl.get()) |
4658 | return ExprResult(); |
4659 | |
4660 | VarDecl *Var = cast<VarDecl>(Decl.get()); |
4661 | if (!Var->getTemplateSpecializationKind()) |
4662 | Var->setTemplateSpecializationKind(TSK_ImplicitInstantiation, |
4663 | NameInfo.getLoc()); |
4664 | |
4665 | // Build an ordinary singleton decl ref. |
4666 | return BuildDeclarationNameExpr(SS, NameInfo, Var, |
4667 | /*FoundD=*/nullptr, TemplateArgs); |
4668 | } |
4669 | |
4670 | void Sema::diagnoseMissingTemplateArguments(TemplateName Name, |
4671 | SourceLocation Loc) { |
4672 | Diag(Loc, diag::err_template_missing_args) |
4673 | << (int)getTemplateNameKindForDiagnostics(Name) << Name; |
4674 | if (TemplateDecl *TD = Name.getAsTemplateDecl()) { |
4675 | Diag(TD->getLocation(), diag::note_template_decl_here) |
4676 | << TD->getTemplateParameters()->getSourceRange(); |
4677 | } |
4678 | } |
4679 | |
4680 | ExprResult |
4681 | Sema::CheckConceptTemplateId(const CXXScopeSpec &SS, |
4682 | SourceLocation TemplateKWLoc, |
4683 | const DeclarationNameInfo &ConceptNameInfo, |
4684 | NamedDecl *FoundDecl, |
4685 | ConceptDecl *NamedConcept, |
4686 | const TemplateArgumentListInfo *TemplateArgs) { |
4687 | assert(NamedConcept && "A concept template id without a template?")((void)0); |
4688 | |
4689 | llvm::SmallVector<TemplateArgument, 4> Converted; |
4690 | if (CheckTemplateArgumentList(NamedConcept, ConceptNameInfo.getLoc(), |
4691 | const_cast<TemplateArgumentListInfo&>(*TemplateArgs), |
4692 | /*PartialTemplateArgs=*/false, Converted, |
4693 | /*UpdateArgsWithConversion=*/false)) |
4694 | return ExprError(); |
4695 | |
4696 | ConstraintSatisfaction Satisfaction; |
4697 | bool AreArgsDependent = |
4698 | TemplateSpecializationType::anyDependentTemplateArguments(*TemplateArgs, |
4699 | Converted); |
4700 | if (!AreArgsDependent && |
4701 | CheckConstraintSatisfaction( |
4702 | NamedConcept, {NamedConcept->getConstraintExpr()}, Converted, |
4703 | SourceRange(SS.isSet() ? SS.getBeginLoc() : ConceptNameInfo.getLoc(), |
4704 | TemplateArgs->getRAngleLoc()), |
4705 | Satisfaction)) |
4706 | return ExprError(); |
4707 | |
4708 | return ConceptSpecializationExpr::Create(Context, |
4709 | SS.isSet() ? SS.getWithLocInContext(Context) : NestedNameSpecifierLoc{}, |
4710 | TemplateKWLoc, ConceptNameInfo, FoundDecl, NamedConcept, |
4711 | ASTTemplateArgumentListInfo::Create(Context, *TemplateArgs), Converted, |
4712 | AreArgsDependent ? nullptr : &Satisfaction); |
4713 | } |
4714 | |
4715 | ExprResult Sema::BuildTemplateIdExpr(const CXXScopeSpec &SS, |
4716 | SourceLocation TemplateKWLoc, |
4717 | LookupResult &R, |
4718 | bool RequiresADL, |
4719 | const TemplateArgumentListInfo *TemplateArgs) { |
4720 | // FIXME: Can we do any checking at this point? I guess we could check the |
4721 | // template arguments that we have against the template name, if the template |
4722 | // name refers to a single template. That's not a terribly common case, |
4723 | // though. |
4724 | // foo<int> could identify a single function unambiguously |
4725 | // This approach does NOT work, since f<int>(1); |
4726 | // gets resolved prior to resorting to overload resolution |
4727 | // i.e., template<class T> void f(double); |
4728 | // vs template<class T, class U> void f(U); |
4729 | |
4730 | // These should be filtered out by our callers. |
4731 | assert(!R.isAmbiguous() && "ambiguous lookup when building templateid")((void)0); |
4732 | |
4733 | // Non-function templates require a template argument list. |
4734 | if (auto *TD = R.getAsSingle<TemplateDecl>()) { |
4735 | if (!TemplateArgs && !isa<FunctionTemplateDecl>(TD)) { |
4736 | diagnoseMissingTemplateArguments(TemplateName(TD), R.getNameLoc()); |
4737 | return ExprError(); |
4738 | } |
4739 | } |
4740 | |
4741 | // In C++1y, check variable template ids. |
4742 | if (R.getAsSingle<VarTemplateDecl>()) { |
4743 | ExprResult Res = CheckVarTemplateId(SS, R.getLookupNameInfo(), |
4744 | R.getAsSingle<VarTemplateDecl>(), |
4745 | TemplateKWLoc, TemplateArgs); |
4746 | if (Res.isInvalid() || Res.isUsable()) |
4747 | return Res; |
4748 | // Result is dependent. Carry on to build an UnresolvedLookupEpxr. |
4749 | } |
4750 | |
4751 | if (R.getAsSingle<ConceptDecl>()) { |
4752 | return CheckConceptTemplateId(SS, TemplateKWLoc, R.getLookupNameInfo(), |
4753 | R.getFoundDecl(), |
4754 | R.getAsSingle<ConceptDecl>(), TemplateArgs); |
4755 | } |
4756 | |
4757 | // We don't want lookup warnings at this point. |
4758 | R.suppressDiagnostics(); |
4759 | |
4760 | UnresolvedLookupExpr *ULE |
4761 | = UnresolvedLookupExpr::Create(Context, R.getNamingClass(), |
4762 | SS.getWithLocInContext(Context), |
4763 | TemplateKWLoc, |
4764 | R.getLookupNameInfo(), |
4765 | RequiresADL, TemplateArgs, |
4766 | R.begin(), R.end()); |
4767 | |
4768 | return ULE; |
4769 | } |
4770 | |
4771 | // We actually only call this from template instantiation. |
4772 | ExprResult |
4773 | Sema::BuildQualifiedTemplateIdExpr(CXXScopeSpec &SS, |
4774 | SourceLocation TemplateKWLoc, |
4775 | const DeclarationNameInfo &NameInfo, |
4776 | const TemplateArgumentListInfo *TemplateArgs) { |
4777 | |
4778 | assert(TemplateArgs || TemplateKWLoc.isValid())((void)0); |
4779 | DeclContext *DC; |
4780 | if (!(DC = computeDeclContext(SS, false)) || |
4781 | DC->isDependentContext() || |
4782 | RequireCompleteDeclContext(SS, DC)) |
4783 | return BuildDependentDeclRefExpr(SS, TemplateKWLoc, NameInfo, TemplateArgs); |
4784 | |
4785 | bool MemberOfUnknownSpecialization; |
4786 | LookupResult R(*this, NameInfo, LookupOrdinaryName); |
4787 | if (LookupTemplateName(R, (Scope *)nullptr, SS, QualType(), |
4788 | /*Entering*/false, MemberOfUnknownSpecialization, |
4789 | TemplateKWLoc)) |
4790 | return ExprError(); |
4791 | |
4792 | if (R.isAmbiguous()) |
4793 | return ExprError(); |
4794 | |
4795 | if (R.empty()) { |
4796 | Diag(NameInfo.getLoc(), diag::err_no_member) |
4797 | << NameInfo.getName() << DC << SS.getRange(); |
4798 | return ExprError(); |
4799 | } |
4800 | |
4801 | if (ClassTemplateDecl *Temp = R.getAsSingle<ClassTemplateDecl>()) { |
4802 | Diag(NameInfo.getLoc(), diag::err_template_kw_refers_to_class_template) |
4803 | << SS.getScopeRep() |
4804 | << NameInfo.getName().getAsString() << SS.getRange(); |
4805 | Diag(Temp->getLocation(), diag::note_referenced_class_template); |
4806 | return ExprError(); |
4807 | } |
4808 | |
4809 | return BuildTemplateIdExpr(SS, TemplateKWLoc, R, /*ADL*/ false, TemplateArgs); |
4810 | } |
4811 | |
4812 | /// Form a template name from a name that is syntactically required to name a |
4813 | /// template, either due to use of the 'template' keyword or because a name in |
4814 | /// this syntactic context is assumed to name a template (C++ [temp.names]p2-4). |
4815 | /// |
4816 | /// This action forms a template name given the name of the template and its |
4817 | /// optional scope specifier. This is used when the 'template' keyword is used |
4818 | /// or when the parsing context unambiguously treats a following '<' as |
4819 | /// introducing a template argument list. Note that this may produce a |
4820 | /// non-dependent template name if we can perform the lookup now and identify |
4821 | /// the named template. |
4822 | /// |
4823 | /// For example, given "x.MetaFun::template apply", the scope specifier |
4824 | /// \p SS will be "MetaFun::", \p TemplateKWLoc contains the location |
4825 | /// of the "template" keyword, and "apply" is the \p Name. |
4826 | TemplateNameKind Sema::ActOnTemplateName(Scope *S, |
4827 | CXXScopeSpec &SS, |
4828 | SourceLocation TemplateKWLoc, |
4829 | const UnqualifiedId &Name, |
4830 | ParsedType ObjectType, |
4831 | bool EnteringContext, |
4832 | TemplateTy &Result, |
4833 | bool AllowInjectedClassName) { |
4834 | if (TemplateKWLoc.isValid() && S && !S->getTemplateParamParent()) |
4835 | Diag(TemplateKWLoc, |
4836 | getLangOpts().CPlusPlus11 ? |
4837 | diag::warn_cxx98_compat_template_outside_of_template : |
4838 | diag::ext_template_outside_of_template) |
4839 | << FixItHint::CreateRemoval(TemplateKWLoc); |
4840 | |
4841 | if (SS.isInvalid()) |
4842 | return TNK_Non_template; |
4843 | |
4844 | // Figure out where isTemplateName is going to look. |
4845 | DeclContext *LookupCtx = nullptr; |
4846 | if (SS.isNotEmpty()) |
4847 | LookupCtx = computeDeclContext(SS, EnteringContext); |
4848 | else if (ObjectType) |
4849 | LookupCtx = computeDeclContext(GetTypeFromParser(ObjectType)); |
4850 | |
4851 | // C++0x [temp.names]p5: |
4852 | // If a name prefixed by the keyword template is not the name of |
4853 | // a template, the program is ill-formed. [Note: the keyword |
4854 | // template may not be applied to non-template members of class |
4855 | // templates. -end note ] [ Note: as is the case with the |
4856 | // typename prefix, the template prefix is allowed in cases |
4857 | // where it is not strictly necessary; i.e., when the |
4858 | // nested-name-specifier or the expression on the left of the -> |
4859 | // or . is not dependent on a template-parameter, or the use |
4860 | // does not appear in the scope of a template. -end note] |
4861 | // |
4862 | // Note: C++03 was more strict here, because it banned the use of |
4863 | // the "template" keyword prior to a template-name that was not a |
4864 | // dependent name. C++ DR468 relaxed this requirement (the |
4865 | // "template" keyword is now permitted). We follow the C++0x |
4866 | // rules, even in C++03 mode with a warning, retroactively applying the DR. |
4867 | bool MemberOfUnknownSpecialization; |
4868 | TemplateNameKind TNK = isTemplateName(S, SS, TemplateKWLoc.isValid(), Name, |
4869 | ObjectType, EnteringContext, Result, |
4870 | MemberOfUnknownSpecialization); |
4871 | if (TNK != TNK_Non_template) { |
4872 | // We resolved this to a (non-dependent) template name. Return it. |
4873 | auto *LookupRD = dyn_cast_or_null<CXXRecordDecl>(LookupCtx); |
4874 | if (!AllowInjectedClassName && SS.isNotEmpty() && LookupRD && |
4875 | Name.getKind() == UnqualifiedIdKind::IK_Identifier && |
4876 | Name.Identifier && LookupRD->getIdentifier() == Name.Identifier) { |
4877 | // C++14 [class.qual]p2: |
4878 | // In a lookup in which function names are not ignored and the |
4879 | // nested-name-specifier nominates a class C, if the name specified |
4880 | // [...] is the injected-class-name of C, [...] the name is instead |
4881 | // considered to name the constructor |
4882 | // |
4883 | // We don't get here if naming the constructor would be valid, so we |
4884 | // just reject immediately and recover by treating the |
4885 | // injected-class-name as naming the template. |
4886 | Diag(Name.getBeginLoc(), |
4887 | diag::ext_out_of_line_qualified_id_type_names_constructor) |
4888 | << Name.Identifier |
4889 | << 0 /*injected-class-name used as template name*/ |
4890 | << TemplateKWLoc.isValid(); |
4891 | } |
4892 | return TNK; |
4893 | } |
4894 | |
4895 | if (!MemberOfUnknownSpecialization) { |
4896 | // Didn't find a template name, and the lookup wasn't dependent. |
4897 | // Do the lookup again to determine if this is a "nothing found" case or |
4898 | // a "not a template" case. FIXME: Refactor isTemplateName so we don't |
4899 | // need to do this. |
4900 | DeclarationNameInfo DNI = GetNameFromUnqualifiedId(Name); |
4901 | LookupResult R(*this, DNI.getName(), Name.getBeginLoc(), |
4902 | LookupOrdinaryName); |
4903 | bool MOUS; |
4904 | // Tell LookupTemplateName that we require a template so that it diagnoses |
4905 | // cases where it finds a non-template. |
4906 | RequiredTemplateKind RTK = TemplateKWLoc.isValid() |
4907 | ? RequiredTemplateKind(TemplateKWLoc) |
4908 | : TemplateNameIsRequired; |
4909 | if (!LookupTemplateName(R, S, SS, ObjectType.get(), EnteringContext, MOUS, |
4910 | RTK, nullptr, /*AllowTypoCorrection=*/false) && |
4911 | !R.isAmbiguous()) { |
4912 | if (LookupCtx) |
4913 | Diag(Name.getBeginLoc(), diag::err_no_member) |
4914 | << DNI.getName() << LookupCtx << SS.getRange(); |
4915 | else |
4916 | Diag(Name.getBeginLoc(), diag::err_undeclared_use) |
4917 | << DNI.getName() << SS.getRange(); |
4918 | } |
4919 | return TNK_Non_template; |
4920 | } |
4921 | |
4922 | NestedNameSpecifier *Qualifier = SS.getScopeRep(); |
4923 | |
4924 | switch (Name.getKind()) { |
4925 | case UnqualifiedIdKind::IK_Identifier: |
4926 | Result = TemplateTy::make( |
4927 | Context.getDependentTemplateName(Qualifier, Name.Identifier)); |
4928 | return TNK_Dependent_template_name; |
4929 | |
4930 | case UnqualifiedIdKind::IK_OperatorFunctionId: |
4931 | Result = TemplateTy::make(Context.getDependentTemplateName( |
4932 | Qualifier, Name.OperatorFunctionId.Operator)); |
4933 | return TNK_Function_template; |
4934 | |
4935 | case UnqualifiedIdKind::IK_LiteralOperatorId: |
4936 | // This is a kind of template name, but can never occur in a dependent |
4937 | // scope (literal operators can only be declared at namespace scope). |
4938 | break; |
4939 | |
4940 | default: |
4941 | break; |
4942 | } |
4943 | |
4944 | // This name cannot possibly name a dependent template. Diagnose this now |
4945 | // rather than building a dependent template name that can never be valid. |
4946 | Diag(Name.getBeginLoc(), |
4947 | diag::err_template_kw_refers_to_dependent_non_template) |
4948 | << GetNameFromUnqualifiedId(Name).getName() << Name.getSourceRange() |
4949 | << TemplateKWLoc.isValid() << TemplateKWLoc; |
4950 | return TNK_Non_template; |
4951 | } |
4952 | |
4953 | bool Sema::CheckTemplateTypeArgument(TemplateTypeParmDecl *Param, |
4954 | TemplateArgumentLoc &AL, |
4955 | SmallVectorImpl<TemplateArgument> &Converted) { |
4956 | const TemplateArgument &Arg = AL.getArgument(); |
4957 | QualType ArgType; |
4958 | TypeSourceInfo *TSI = nullptr; |
4959 | |
4960 | // Check template type parameter. |
4961 | switch(Arg.getKind()) { |
4962 | case TemplateArgument::Type: |
4963 | // C++ [temp.arg.type]p1: |
4964 | // A template-argument for a template-parameter which is a |
4965 | // type shall be a type-id. |
4966 | ArgType = Arg.getAsType(); |
4967 | TSI = AL.getTypeSourceInfo(); |
4968 | break; |
4969 | case TemplateArgument::Template: |
4970 | case TemplateArgument::TemplateExpansion: { |
4971 | // We have a template type parameter but the template argument |
4972 | // is a template without any arguments. |
4973 | SourceRange SR = AL.getSourceRange(); |
4974 | TemplateName Name = Arg.getAsTemplateOrTemplatePattern(); |
4975 | diagnoseMissingTemplateArguments(Name, SR.getEnd()); |
4976 | return true; |
4977 | } |
4978 | case TemplateArgument::Expression: { |
4979 | // We have a template type parameter but the template argument is an |
4980 | // expression; see if maybe it is missing the "typename" keyword. |
4981 | CXXScopeSpec SS; |
4982 | DeclarationNameInfo NameInfo; |
4983 | |
4984 | if (DependentScopeDeclRefExpr *ArgExpr = |
4985 | dyn_cast<DependentScopeDeclRefExpr>(Arg.getAsExpr())) { |
4986 | SS.Adopt(ArgExpr->getQualifierLoc()); |
4987 | NameInfo = ArgExpr->getNameInfo(); |
4988 | } else if (CXXDependentScopeMemberExpr *ArgExpr = |
4989 | dyn_cast<CXXDependentScopeMemberExpr>(Arg.getAsExpr())) { |
4990 | if (ArgExpr->isImplicitAccess()) { |
4991 | SS.Adopt(ArgExpr->getQualifierLoc()); |
4992 | NameInfo = ArgExpr->getMemberNameInfo(); |
4993 | } |
4994 | } |
4995 | |
4996 | if (auto *II = NameInfo.getName().getAsIdentifierInfo()) { |
4997 | LookupResult Result(*this, NameInfo, LookupOrdinaryName); |
4998 | LookupParsedName(Result, CurScope, &SS); |
4999 | |
5000 | if (Result.getAsSingle<TypeDecl>() || |
5001 | Result.getResultKind() == |
5002 | LookupResult::NotFoundInCurrentInstantiation) { |
5003 | assert(SS.getScopeRep() && "dependent scope expr must has a scope!")((void)0); |
5004 | // Suggest that the user add 'typename' before the NNS. |
5005 | SourceLocation Loc = AL.getSourceRange().getBegin(); |
5006 | Diag(Loc, getLangOpts().MSVCCompat |
5007 | ? diag::ext_ms_template_type_arg_missing_typename |
5008 | : diag::err_template_arg_must_be_type_suggest) |
5009 | << FixItHint::CreateInsertion(Loc, "typename "); |
5010 | Diag(Param->getLocation(), diag::note_template_param_here); |
5011 | |
5012 | // Recover by synthesizing a type using the location information that we |
5013 | // already have. |
5014 | ArgType = |
5015 | Context.getDependentNameType(ETK_Typename, SS.getScopeRep(), II); |
5016 | TypeLocBuilder TLB; |
5017 | DependentNameTypeLoc TL = TLB.push<DependentNameTypeLoc>(ArgType); |
5018 | TL.setElaboratedKeywordLoc(SourceLocation(/*synthesized*/)); |
5019 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); |
5020 | TL.setNameLoc(NameInfo.getLoc()); |
5021 | TSI = TLB.getTypeSourceInfo(Context, ArgType); |
5022 | |
5023 | // Overwrite our input TemplateArgumentLoc so that we can recover |
5024 | // properly. |
5025 | AL = TemplateArgumentLoc(TemplateArgument(ArgType), |
5026 | TemplateArgumentLocInfo(TSI)); |
5027 | |
5028 | break; |
5029 | } |
5030 | } |
5031 | // fallthrough |
5032 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; |
5033 | } |
5034 | default: { |
5035 | // We have a template type parameter but the template argument |
5036 | // is not a type. |
5037 | SourceRange SR = AL.getSourceRange(); |
5038 | Diag(SR.getBegin(), diag::err_template_arg_must_be_type) << SR; |
5039 | Diag(Param->getLocation(), diag::note_template_param_here); |
5040 | |
5041 | return true; |
5042 | } |
5043 | } |
5044 | |
5045 | if (CheckTemplateArgument(TSI)) |
5046 | return true; |
5047 | |
5048 | // Add the converted template type argument. |
5049 | ArgType = Context.getCanonicalType(ArgType); |
5050 | |
5051 | // Objective-C ARC: |
5052 | // If an explicitly-specified template argument type is a lifetime type |
5053 | // with no lifetime qualifier, the __strong lifetime qualifier is inferred. |
5054 | if (getLangOpts().ObjCAutoRefCount && |
5055 | ArgType->isObjCLifetimeType() && |
5056 | !ArgType.getObjCLifetime()) { |
5057 | Qualifiers Qs; |
5058 | Qs.setObjCLifetime(Qualifiers::OCL_Strong); |
5059 | ArgType = Context.getQualifiedType(ArgType, Qs); |
5060 | } |
5061 | |
5062 | Converted.push_back(TemplateArgument(ArgType)); |
5063 | return false; |
5064 | } |
5065 | |
5066 | /// Substitute template arguments into the default template argument for |
5067 | /// the given template type parameter. |
5068 | /// |
5069 | /// \param SemaRef the semantic analysis object for which we are performing |
5070 | /// the substitution. |
5071 | /// |
5072 | /// \param Template the template that we are synthesizing template arguments |
5073 | /// for. |
5074 | /// |
5075 | /// \param TemplateLoc the location of the template name that started the |
5076 | /// template-id we are checking. |
5077 | /// |
5078 | /// \param RAngleLoc the location of the right angle bracket ('>') that |
5079 | /// terminates the template-id. |
5080 | /// |
5081 | /// \param Param the template template parameter whose default we are |
5082 | /// substituting into. |
5083 | /// |
5084 | /// \param Converted the list of template arguments provided for template |
5085 | /// parameters that precede \p Param in the template parameter list. |
5086 | /// \returns the substituted template argument, or NULL if an error occurred. |
5087 | static TypeSourceInfo * |
5088 | SubstDefaultTemplateArgument(Sema &SemaRef, |
5089 | TemplateDecl *Template, |
5090 | SourceLocation TemplateLoc, |
5091 | SourceLocation RAngleLoc, |
5092 | TemplateTypeParmDecl *Param, |
5093 | SmallVectorImpl<TemplateArgument> &Converted) { |
5094 | TypeSourceInfo *ArgType = Param->getDefaultArgumentInfo(); |
5095 | |
5096 | // If the argument type is dependent, instantiate it now based |
5097 | // on the previously-computed template arguments. |
5098 | if (ArgType->getType()->isInstantiationDependentType()) { |
5099 | Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc, |
5100 | Param, Template, Converted, |
5101 | SourceRange(TemplateLoc, RAngleLoc)); |
5102 | if (Inst.isInvalid()) |
5103 | return nullptr; |
5104 | |
5105 | TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted); |
5106 | |
5107 | // Only substitute for the innermost template argument list. |
5108 | MultiLevelTemplateArgumentList TemplateArgLists; |
5109 | TemplateArgLists.addOuterTemplateArguments(&TemplateArgs); |
5110 | for (unsigned i = 0, e = Param->getDepth(); i != e; ++i) |
5111 | TemplateArgLists.addOuterTemplateArguments(None); |
5112 | |
5113 | Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext()); |
5114 | ArgType = |
5115 | SemaRef.SubstType(ArgType, TemplateArgLists, |
5116 | Param->getDefaultArgumentLoc(), Param->getDeclName()); |
5117 | } |
5118 | |
5119 | return ArgType; |
5120 | } |
5121 | |
5122 | /// Substitute template arguments into the default template argument for |
5123 | /// the given non-type template parameter. |
5124 | /// |
5125 | /// \param SemaRef the semantic analysis object for which we are performing |
5126 | /// the substitution. |
5127 | /// |
5128 | /// \param Template the template that we are synthesizing template arguments |
5129 | /// for. |
5130 | /// |
5131 | /// \param TemplateLoc the location of the template name that started the |
5132 | /// template-id we are checking. |
5133 | /// |
5134 | /// \param RAngleLoc the location of the right angle bracket ('>') that |
5135 | /// terminates the template-id. |
5136 | /// |
5137 | /// \param Param the non-type template parameter whose default we are |
5138 | /// substituting into. |
5139 | /// |
5140 | /// \param Converted the list of template arguments provided for template |
5141 | /// parameters that precede \p Param in the template parameter list. |
5142 | /// |
5143 | /// \returns the substituted template argument, or NULL if an error occurred. |
5144 | static ExprResult |
5145 | SubstDefaultTemplateArgument(Sema &SemaRef, |
5146 | TemplateDecl *Template, |
5147 | SourceLocation TemplateLoc, |
5148 | SourceLocation RAngleLoc, |
5149 | NonTypeTemplateParmDecl *Param, |
5150 | SmallVectorImpl<TemplateArgument> &Converted) { |
5151 | Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc, |
5152 | Param, Template, Converted, |
5153 | SourceRange(TemplateLoc, RAngleLoc)); |
5154 | if (Inst.isInvalid()) |
5155 | return ExprError(); |
5156 | |
5157 | TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted); |
5158 | |
5159 | // Only substitute for the innermost template argument list. |
5160 | MultiLevelTemplateArgumentList TemplateArgLists; |
5161 | TemplateArgLists.addOuterTemplateArguments(&TemplateArgs); |
5162 | for (unsigned i = 0, e = Param->getDepth(); i != e; ++i) |
5163 | TemplateArgLists.addOuterTemplateArguments(None); |
5164 | |
5165 | Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext()); |
5166 | EnterExpressionEvaluationContext ConstantEvaluated( |
5167 | SemaRef, Sema::ExpressionEvaluationContext::ConstantEvaluated); |
5168 | return SemaRef.SubstExpr(Param->getDefaultArgument(), TemplateArgLists); |
5169 | } |
5170 | |
5171 | /// Substitute template arguments into the default template argument for |
5172 | /// the given template template parameter. |
5173 | /// |
5174 | /// \param SemaRef the semantic analysis object for which we are performing |
5175 | /// the substitution. |
5176 | /// |
5177 | /// \param Template the template that we are synthesizing template arguments |
5178 | /// for. |
5179 | /// |
5180 | /// \param TemplateLoc the location of the template name that started the |
5181 | /// template-id we are checking. |
5182 | /// |
5183 | /// \param RAngleLoc the location of the right angle bracket ('>') that |
5184 | /// terminates the template-id. |
5185 | /// |
5186 | /// \param Param the template template parameter whose default we are |
5187 | /// substituting into. |
5188 | /// |
5189 | /// \param Converted the list of template arguments provided for template |
5190 | /// parameters that precede \p Param in the template parameter list. |
5191 | /// |
5192 | /// \param QualifierLoc Will be set to the nested-name-specifier (with |
5193 | /// source-location information) that precedes the template name. |
5194 | /// |
5195 | /// \returns the substituted template argument, or NULL if an error occurred. |
5196 | static TemplateName |
5197 | SubstDefaultTemplateArgument(Sema &SemaRef, |
5198 | TemplateDecl *Template, |
5199 | SourceLocation TemplateLoc, |
5200 | SourceLocation RAngleLoc, |
5201 | TemplateTemplateParmDecl *Param, |
5202 | SmallVectorImpl<TemplateArgument> &Converted, |
5203 | NestedNameSpecifierLoc &QualifierLoc) { |
5204 | Sema::InstantiatingTemplate Inst( |
5205 | SemaRef, TemplateLoc, TemplateParameter(Param), Template, Converted, |
5206 | SourceRange(TemplateLoc, RAngleLoc)); |
5207 | if (Inst.isInvalid()) |
5208 | return TemplateName(); |
5209 | |
5210 | TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted); |
5211 | |
5212 | // Only substitute for the innermost template argument list. |
5213 | MultiLevelTemplateArgumentList TemplateArgLists; |
5214 | TemplateArgLists.addOuterTemplateArguments(&TemplateArgs); |
5215 | for (unsigned i = 0, e = Param->getDepth(); i != e; ++i) |
5216 | TemplateArgLists.addOuterTemplateArguments(None); |
5217 | |
5218 | Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext()); |
5219 | // Substitute into the nested-name-specifier first, |
5220 | QualifierLoc = Param->getDefaultArgument().getTemplateQualifierLoc(); |
5221 | if (QualifierLoc) { |
5222 | QualifierLoc = |
5223 | SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc, TemplateArgLists); |
5224 | if (!QualifierLoc) |
5225 | return TemplateName(); |
5226 | } |
5227 | |
5228 | return SemaRef.SubstTemplateName( |
5229 | QualifierLoc, |
5230 | Param->getDefaultArgument().getArgument().getAsTemplate(), |
5231 | Param->getDefaultArgument().getTemplateNameLoc(), |
5232 | TemplateArgLists); |
5233 | } |
5234 | |
5235 | /// If the given template parameter has a default template |
5236 | /// argument, substitute into that default template argument and |
5237 | /// return the corresponding template argument. |
5238 | TemplateArgumentLoc |
5239 | Sema::SubstDefaultTemplateArgumentIfAvailable(TemplateDecl *Template, |
5240 | SourceLocation TemplateLoc, |
5241 | SourceLocation RAngleLoc, |
5242 | Decl *Param, |
5243 | SmallVectorImpl<TemplateArgument> |
5244 | &Converted, |
5245 | bool &HasDefaultArg) { |
5246 | HasDefaultArg = false; |
5247 | |
5248 | if (TemplateTypeParmDecl *TypeParm = dyn_cast<TemplateTypeParmDecl>(Param)) { |
5249 | if (!hasVisibleDefaultArgument(TypeParm)) |
5250 | return TemplateArgumentLoc(); |
5251 | |
5252 | HasDefaultArg = true; |
5253 | TypeSourceInfo *DI = SubstDefaultTemplateArgument(*this, Template, |
5254 | TemplateLoc, |
5255 | RAngleLoc, |
5256 | TypeParm, |
5257 | Converted); |
5258 | if (DI) |
5259 | return TemplateArgumentLoc(TemplateArgument(DI->getType()), DI); |
5260 | |
5261 | return TemplateArgumentLoc(); |
5262 | } |
5263 | |
5264 | if (NonTypeTemplateParmDecl *NonTypeParm |
5265 | = dyn_cast<NonTypeTemplateParmDecl>(Param)) { |
5266 | if (!hasVisibleDefaultArgument(NonTypeParm)) |
5267 | return TemplateArgumentLoc(); |
5268 | |
5269 | HasDefaultArg = true; |
5270 | ExprResult Arg = SubstDefaultTemplateArgument(*this, Template, |
5271 | TemplateLoc, |
5272 | RAngleLoc, |
5273 | NonTypeParm, |
5274 | Converted); |
5275 | if (Arg.isInvalid()) |
5276 | return TemplateArgumentLoc(); |
5277 | |
5278 | Expr *ArgE = Arg.getAs<Expr>(); |
5279 | return TemplateArgumentLoc(TemplateArgument(ArgE), ArgE); |
5280 | } |
5281 | |
5282 | TemplateTemplateParmDecl *TempTempParm |
5283 | = cast<TemplateTemplateParmDecl>(Param); |
5284 | if (!hasVisibleDefaultArgument(TempTempParm)) |
5285 | return TemplateArgumentLoc(); |
5286 | |
5287 | HasDefaultArg = true; |
5288 | NestedNameSpecifierLoc QualifierLoc; |
5289 | TemplateName TName = SubstDefaultTemplateArgument(*this, Template, |
5290 | TemplateLoc, |
5291 | RAngleLoc, |
5292 | TempTempParm, |
5293 | Converted, |
5294 | QualifierLoc); |
5295 | if (TName.isNull()) |
5296 | return TemplateArgumentLoc(); |
5297 | |
5298 | return TemplateArgumentLoc( |
5299 | Context, TemplateArgument(TName), |
5300 | TempTempParm->getDefaultArgument().getTemplateQualifierLoc(), |
5301 | TempTempParm->getDefaultArgument().getTemplateNameLoc()); |
5302 | } |
5303 | |
5304 | /// Convert a template-argument that we parsed as a type into a template, if |
5305 | /// possible. C++ permits injected-class-names to perform dual service as |
5306 | /// template template arguments and as template type arguments. |
5307 | static TemplateArgumentLoc |
5308 | convertTypeTemplateArgumentToTemplate(ASTContext &Context, TypeLoc TLoc) { |
5309 | // Extract and step over any surrounding nested-name-specifier. |
5310 | NestedNameSpecifierLoc QualLoc; |
5311 | if (auto ETLoc = TLoc.getAs<ElaboratedTypeLoc>()) { |
5312 | if (ETLoc.getTypePtr()->getKeyword() != ETK_None) |
5313 | return TemplateArgumentLoc(); |
5314 | |
5315 | QualLoc = ETLoc.getQualifierLoc(); |
5316 | TLoc = ETLoc.getNamedTypeLoc(); |
5317 | } |
5318 | // If this type was written as an injected-class-name, it can be used as a |
5319 | // template template argument. |
5320 | if (auto InjLoc = TLoc.getAs<InjectedClassNameTypeLoc>()) |
5321 | return TemplateArgumentLoc(Context, InjLoc.getTypePtr()->getTemplateName(), |
5322 | QualLoc, InjLoc.getNameLoc()); |
5323 | |
5324 | // If this type was written as an injected-class-name, it may have been |
5325 | // converted to a RecordType during instantiation. If the RecordType is |
5326 | // *not* wrapped in a TemplateSpecializationType and denotes a class |
5327 | // template specialization, it must have come from an injected-class-name. |
5328 | if (auto RecLoc = TLoc.getAs<RecordTypeLoc>()) |
5329 | if (auto *CTSD = |
5330 | dyn_cast<ClassTemplateSpecializationDecl>(RecLoc.getDecl())) |
5331 | return TemplateArgumentLoc(Context, |
5332 | TemplateName(CTSD->getSpecializedTemplate()), |
5333 | QualLoc, RecLoc.getNameLoc()); |
5334 | |
5335 | return TemplateArgumentLoc(); |
5336 | } |
5337 | |
5338 | /// Check that the given template argument corresponds to the given |
5339 | /// template parameter. |
5340 | /// |
5341 | /// \param Param The template parameter against which the argument will be |
5342 | /// checked. |
5343 | /// |
5344 | /// \param Arg The template argument, which may be updated due to conversions. |
5345 | /// |
5346 | /// \param Template The template in which the template argument resides. |
5347 | /// |
5348 | /// \param TemplateLoc The location of the template name for the template |
5349 | /// whose argument list we're matching. |
5350 | /// |
5351 | /// \param RAngleLoc The location of the right angle bracket ('>') that closes |
5352 | /// the template argument list. |
5353 | /// |
5354 | /// \param ArgumentPackIndex The index into the argument pack where this |
5355 | /// argument will be placed. Only valid if the parameter is a parameter pack. |
5356 | /// |
5357 | /// \param Converted The checked, converted argument will be added to the |
5358 | /// end of this small vector. |
5359 | /// |
5360 | /// \param CTAK Describes how we arrived at this particular template argument: |
5361 | /// explicitly written, deduced, etc. |
5362 | /// |
5363 | /// \returns true on error, false otherwise. |
5364 | bool Sema::CheckTemplateArgument(NamedDecl *Param, |
5365 | TemplateArgumentLoc &Arg, |
5366 | NamedDecl *Template, |
5367 | SourceLocation TemplateLoc, |
5368 | SourceLocation RAngleLoc, |
5369 | unsigned ArgumentPackIndex, |
5370 | SmallVectorImpl<TemplateArgument> &Converted, |
5371 | CheckTemplateArgumentKind CTAK) { |
5372 | // Check template type parameters. |
5373 | if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param)) |
5374 | return CheckTemplateTypeArgument(TTP, Arg, Converted); |
5375 | |
5376 | // Check non-type template parameters. |
5377 | if (NonTypeTemplateParmDecl *NTTP =dyn_cast<NonTypeTemplateParmDecl>(Param)) { |
5378 | // Do substitution on the type of the non-type template parameter |
5379 | // with the template arguments we've seen thus far. But if the |
5380 | // template has a dependent context then we cannot substitute yet. |
5381 | QualType NTTPType = NTTP->getType(); |
5382 | if (NTTP->isParameterPack() && NTTP->isExpandedParameterPack()) |
5383 | NTTPType = NTTP->getExpansionType(ArgumentPackIndex); |
5384 | |
5385 | if (NTTPType->isInstantiationDependentType() && |
5386 | !isa<TemplateTemplateParmDecl>(Template) && |
5387 | !Template->getDeclContext()->isDependentContext()) { |
5388 | // Do substitution on the type of the non-type template parameter. |
5389 | InstantiatingTemplate Inst(*this, TemplateLoc, Template, |
5390 | NTTP, Converted, |
5391 | SourceRange(TemplateLoc, RAngleLoc)); |
5392 | if (Inst.isInvalid()) |
5393 | return true; |
5394 | |
5395 | TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, |
5396 | Converted); |
5397 | |
5398 | // If the parameter is a pack expansion, expand this slice of the pack. |
5399 | if (auto *PET = NTTPType->getAs<PackExpansionType>()) { |
5400 | Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(*this, |
5401 | ArgumentPackIndex); |
5402 | NTTPType = SubstType(PET->getPattern(), |
5403 | MultiLevelTemplateArgumentList(TemplateArgs), |
5404 | NTTP->getLocation(), |
5405 | NTTP->getDeclName()); |
5406 | } else { |
5407 | NTTPType = SubstType(NTTPType, |
5408 | MultiLevelTemplateArgumentList(TemplateArgs), |
5409 | NTTP->getLocation(), |
5410 | NTTP->getDeclName()); |
5411 | } |
5412 | |
5413 | // If that worked, check the non-type template parameter type |
5414 | // for validity. |
5415 | if (!NTTPType.isNull()) |
5416 | NTTPType = CheckNonTypeTemplateParameterType(NTTPType, |
5417 | NTTP->getLocation()); |
5418 | if (NTTPType.isNull()) |
5419 | return true; |
5420 | } |
5421 | |
5422 | switch (Arg.getArgument().getKind()) { |
5423 | case TemplateArgument::Null: |
5424 | llvm_unreachable("Should never see a NULL template argument here")__builtin_unreachable(); |
5425 | |
5426 | case TemplateArgument::Expression: { |
5427 | TemplateArgument Result; |
5428 | unsigned CurSFINAEErrors = NumSFINAEErrors; |
5429 | ExprResult Res = |
5430 | CheckTemplateArgument(NTTP, NTTPType, Arg.getArgument().getAsExpr(), |
5431 | Result, CTAK); |
5432 | if (Res.isInvalid()) |
5433 | return true; |
5434 | // If the current template argument causes an error, give up now. |
5435 | if (CurSFINAEErrors < NumSFINAEErrors) |
5436 | return true; |
5437 | |
5438 | // If the resulting expression is new, then use it in place of the |
5439 | // old expression in the template argument. |
5440 | if (Res.get() != Arg.getArgument().getAsExpr()) { |
5441 | TemplateArgument TA(Res.get()); |
5442 | Arg = TemplateArgumentLoc(TA, Res.get()); |
5443 | } |
5444 | |
5445 | Converted.push_back(Result); |
5446 | break; |
5447 | } |
5448 | |
5449 | case TemplateArgument::Declaration: |
5450 | case TemplateArgument::Integral: |
5451 | case TemplateArgument::NullPtr: |
5452 | // We've already checked this template argument, so just copy |
5453 | // it to the list of converted arguments. |
5454 | Converted.push_back(Arg.getArgument()); |
5455 | break; |
5456 | |
5457 | case TemplateArgument::Template: |
5458 | case TemplateArgument::TemplateExpansion: |
5459 | // We were given a template template argument. It may not be ill-formed; |
5460 | // see below. |
5461 | if (DependentTemplateName *DTN |
5462 | = Arg.getArgument().getAsTemplateOrTemplatePattern() |
5463 | .getAsDependentTemplateName()) { |
5464 | // We have a template argument such as \c T::template X, which we |
5465 | // parsed as a template template argument. However, since we now |
5466 | // know that we need a non-type template argument, convert this |
5467 | // template name into an expression. |
5468 | |
5469 | DeclarationNameInfo NameInfo(DTN->getIdentifier(), |
5470 | Arg.getTemplateNameLoc()); |
5471 | |
5472 | CXXScopeSpec SS; |
5473 | SS.Adopt(Arg.getTemplateQualifierLoc()); |
5474 | // FIXME: the template-template arg was a DependentTemplateName, |
5475 | // so it was provided with a template keyword. However, its source |
5476 | // location is not stored in the template argument structure. |
5477 | SourceLocation TemplateKWLoc; |
5478 | ExprResult E = DependentScopeDeclRefExpr::Create( |
5479 | Context, SS.getWithLocInContext(Context), TemplateKWLoc, NameInfo, |
5480 | nullptr); |
5481 | |
5482 | // If we parsed the template argument as a pack expansion, create a |
5483 | // pack expansion expression. |
5484 | if (Arg.getArgument().getKind() == TemplateArgument::TemplateExpansion){ |
5485 | E = ActOnPackExpansion(E.get(), Arg.getTemplateEllipsisLoc()); |
5486 | if (E.isInvalid()) |
5487 | return true; |
5488 | } |
5489 | |
5490 | TemplateArgument Result; |
5491 | E = CheckTemplateArgument(NTTP, NTTPType, E.get(), Result); |
5492 | if (E.isInvalid()) |
5493 | return true; |
5494 | |
5495 | Converted.push_back(Result); |
5496 | break; |
5497 | } |
5498 | |
5499 | // We have a template argument that actually does refer to a class |
5500 | // template, alias template, or template template parameter, and |
5501 | // therefore cannot be a non-type template argument. |
5502 | Diag(Arg.getLocation(), diag::err_template_arg_must_be_expr) |
5503 | << Arg.getSourceRange(); |
5504 | |
5505 | Diag(Param->getLocation(), diag::note_template_param_here); |
5506 | return true; |
5507 | |
5508 | case TemplateArgument::Type: { |
5509 | // We have a non-type template parameter but the template |
5510 | // argument is a type. |
5511 | |
5512 | // C++ [temp.arg]p2: |
5513 | // In a template-argument, an ambiguity between a type-id and |
5514 | // an expression is resolved to a type-id, regardless of the |
5515 | // form of the corresponding template-parameter. |
5516 | // |
5517 | // We warn specifically about this case, since it can be rather |
5518 | // confusing for users. |
5519 | QualType T = Arg.getArgument().getAsType(); |
5520 | SourceRange SR = Arg.getSourceRange(); |
5521 | if (T->isFunctionType()) |
5522 | Diag(SR.getBegin(), diag::err_template_arg_nontype_ambig) << SR << T; |
5523 | else |
5524 | Diag(SR.getBegin(), diag::err_template_arg_must_be_expr) << SR; |
5525 | Diag(Param->getLocation(), diag::note_template_param_here); |
5526 | return true; |
5527 | } |
5528 | |
5529 | case TemplateArgument::Pack: |
5530 | llvm_unreachable("Caller must expand template argument packs")__builtin_unreachable(); |
5531 | } |
5532 | |
5533 | return false; |
5534 | } |
5535 | |
5536 | |
5537 | // Check template template parameters. |
5538 | TemplateTemplateParmDecl *TempParm = cast<TemplateTemplateParmDecl>(Param); |
5539 | |
5540 | TemplateParameterList *Params = TempParm->getTemplateParameters(); |
5541 | if (TempParm->isExpandedParameterPack()) |
5542 | Params = TempParm->getExpansionTemplateParameters(ArgumentPackIndex); |
5543 | |
5544 | // Substitute into the template parameter list of the template |
5545 | // template parameter, since previously-supplied template arguments |
5546 | // may appear within the template template parameter. |
5547 | // |
5548 | // FIXME: Skip this if the parameters aren't instantiation-dependent. |
5549 | { |
5550 | // Set up a template instantiation context. |
5551 | LocalInstantiationScope Scope(*this); |
5552 | InstantiatingTemplate Inst(*this, TemplateLoc, Template, |
5553 | TempParm, Converted, |
5554 | SourceRange(TemplateLoc, RAngleLoc)); |
5555 | if (Inst.isInvalid()) |
5556 | return true; |
5557 | |
5558 | TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted); |
5559 | Params = SubstTemplateParams(Params, CurContext, |
5560 | MultiLevelTemplateArgumentList(TemplateArgs)); |
5561 | if (!Params) |
5562 | return true; |
5563 | } |
5564 | |
5565 | // C++1z [temp.local]p1: (DR1004) |
5566 | // When [the injected-class-name] is used [...] as a template-argument for |
5567 | // a template template-parameter [...] it refers to the class template |
5568 | // itself. |
5569 | if (Arg.getArgument().getKind() == TemplateArgument::Type) { |
5570 | TemplateArgumentLoc ConvertedArg = convertTypeTemplateArgumentToTemplate( |
5571 | Context, Arg.getTypeSourceInfo()->getTypeLoc()); |
5572 | if (!ConvertedArg.getArgument().isNull()) |
5573 | Arg = ConvertedArg; |
5574 | } |
5575 | |
5576 | switch (Arg.getArgument().getKind()) { |
5577 | case TemplateArgument::Null: |
5578 | llvm_unreachable("Should never see a NULL template argument here")__builtin_unreachable(); |
5579 | |
5580 | case TemplateArgument::Template: |
5581 | case TemplateArgument::TemplateExpansion: |
5582 | if (CheckTemplateTemplateArgument(TempParm, Params, Arg)) |
5583 | return true; |
5584 | |
5585 | Converted.push_back(Arg.getArgument()); |
5586 | break; |
5587 | |
5588 | case TemplateArgument::Expression: |
5589 | case TemplateArgument::Type: |
5590 | // We have a template template parameter but the template |
5591 | // argument does not refer to a template. |
5592 | Diag(Arg.getLocation(), diag::err_template_arg_must_be_template) |
5593 | << getLangOpts().CPlusPlus11; |
5594 | return true; |
5595 | |
5596 | case TemplateArgument::Declaration: |
5597 | llvm_unreachable("Declaration argument with template template parameter")__builtin_unreachable(); |
5598 | case TemplateArgument::Integral: |
5599 | llvm_unreachable("Integral argument with template template parameter")__builtin_unreachable(); |
5600 | case TemplateArgument::NullPtr: |
5601 | llvm_unreachable("Null pointer argument with template template parameter")__builtin_unreachable(); |
5602 | |
5603 | case TemplateArgument::Pack: |
5604 | llvm_unreachable("Caller must expand template argument packs")__builtin_unreachable(); |
5605 | } |
5606 | |
5607 | return false; |
5608 | } |
5609 | |
5610 | /// Diagnose a missing template argument. |
5611 | template<typename TemplateParmDecl> |
5612 | static bool diagnoseMissingArgument(Sema &S, SourceLocation Loc, |
5613 | TemplateDecl *TD, |
5614 | const TemplateParmDecl *D, |
5615 | TemplateArgumentListInfo &Args) { |
5616 | // Dig out the most recent declaration of the template parameter; there may be |
5617 | // declarations of the template that are more recent than TD. |
5618 | D = cast<TemplateParmDecl>(cast<TemplateDecl>(TD->getMostRecentDecl()) |
5619 | ->getTemplateParameters() |
5620 | ->getParam(D->getIndex())); |
5621 | |
5622 | // If there's a default argument that's not visible, diagnose that we're |
5623 | // missing a module import. |
5624 | llvm::SmallVector<Module*, 8> Modules; |
5625 | if (D->hasDefaultArgument() && !S.hasVisibleDefaultArgument(D, &Modules)) { |
5626 | S.diagnoseMissingImport(Loc, cast<NamedDecl>(TD), |
5627 | D->getDefaultArgumentLoc(), Modules, |
5628 | Sema::MissingImportKind::DefaultArgument, |
5629 | /*Recover*/true); |
5630 | return true; |
5631 | } |
5632 | |
5633 | // FIXME: If there's a more recent default argument that *is* visible, |
5634 | // diagnose that it was declared too late. |
5635 | |
5636 | TemplateParameterList *Params = TD->getTemplateParameters(); |
5637 | |
5638 | S.Diag(Loc, diag::err_template_arg_list_different_arity) |
5639 | << /*not enough args*/0 |
5640 | << (int)S.getTemplateNameKindForDiagnostics(TemplateName(TD)) |
5641 | << TD; |
5642 | S.Diag(TD->getLocation(), diag::note_template_decl_here) |
5643 | << Params->getSourceRange(); |
5644 | return true; |
5645 | } |
5646 | |
5647 | /// Check that the given template argument list is well-formed |
5648 | /// for specializing the given template. |
5649 | bool Sema::CheckTemplateArgumentList( |
5650 | TemplateDecl *Template, SourceLocation TemplateLoc, |
5651 | TemplateArgumentListInfo &TemplateArgs, bool PartialTemplateArgs, |
5652 | SmallVectorImpl<TemplateArgument> &Converted, |
5653 | bool UpdateArgsWithConversions, bool *ConstraintsNotSatisfied) { |
5654 | |
5655 | if (ConstraintsNotSatisfied) |
5656 | *ConstraintsNotSatisfied = false; |
5657 | |
5658 | // Make a copy of the template arguments for processing. Only make the |
5659 | // changes at the end when successful in matching the arguments to the |
5660 | // template. |
5661 | TemplateArgumentListInfo NewArgs = TemplateArgs; |
5662 | |
5663 | // Make sure we get the template parameter list from the most |
5664 | // recent declaration, since that is the only one that is guaranteed to |
5665 | // have all the default template argument information. |
5666 | TemplateParameterList *Params = |
5667 | cast<TemplateDecl>(Template->getMostRecentDecl()) |
5668 | ->getTemplateParameters(); |
5669 | |
5670 | SourceLocation RAngleLoc = NewArgs.getRAngleLoc(); |
5671 | |
5672 | // C++ [temp.arg]p1: |
5673 | // [...] The type and form of each template-argument specified in |
5674 | // a template-id shall match the type and form specified for the |
5675 | // corresponding parameter declared by the template in its |
5676 | // template-parameter-list. |
5677 | bool isTemplateTemplateParameter = isa<TemplateTemplateParmDecl>(Template); |
5678 | SmallVector<TemplateArgument, 2> ArgumentPack; |
5679 | unsigned ArgIdx = 0, NumArgs = NewArgs.size(); |
5680 | LocalInstantiationScope InstScope(*this, true); |
5681 | for (TemplateParameterList::iterator Param = Params->begin(), |
5682 | ParamEnd = Params->end(); |
5683 | Param != ParamEnd; /* increment in loop */) { |
5684 | // If we have an expanded parameter pack, make sure we don't have too |
5685 | // many arguments. |
5686 | if (Optional<unsigned> Expansions = getExpandedPackSize(*Param)) { |
5687 | if (*Expansions == ArgumentPack.size()) { |
5688 | // We're done with this parameter pack. Pack up its arguments and add |
5689 | // them to the list. |
5690 | Converted.push_back( |
5691 | TemplateArgument::CreatePackCopy(Context, ArgumentPack)); |
5692 | ArgumentPack.clear(); |
5693 | |
5694 | // This argument is assigned to the next parameter. |
5695 | ++Param; |
5696 | continue; |
5697 | } else if (ArgIdx == NumArgs && !PartialTemplateArgs) { |
5698 | // Not enough arguments for this parameter pack. |
5699 | Diag(TemplateLoc, diag::err_template_arg_list_different_arity) |
5700 | << /*not enough args*/0 |
5701 | << (int)getTemplateNameKindForDiagnostics(TemplateName(Template)) |
5702 | << Template; |
5703 | Diag(Template->getLocation(), diag::note_template_decl_here) |
5704 | << Params->getSourceRange(); |
5705 | return true; |
5706 | } |
5707 | } |
5708 | |
5709 | if (ArgIdx < NumArgs) { |
5710 | // Check the template argument we were given. |
5711 | if (CheckTemplateArgument(*Param, NewArgs[ArgIdx], Template, |
5712 | TemplateLoc, RAngleLoc, |
5713 | ArgumentPack.size(), Converted)) |
5714 | return true; |
5715 | |
5716 | bool PackExpansionIntoNonPack = |
5717 | NewArgs[ArgIdx].getArgument().isPackExpansion() && |
5718 | (!(*Param)->isTemplateParameterPack() || getExpandedPackSize(*Param)); |
5719 | if (PackExpansionIntoNonPack && (isa<TypeAliasTemplateDecl>(Template) || |
5720 | isa<ConceptDecl>(Template))) { |
5721 | // Core issue 1430: we have a pack expansion as an argument to an |
5722 | // alias template, and it's not part of a parameter pack. This |
5723 | // can't be canonicalized, so reject it now. |
5724 | // As for concepts - we cannot normalize constraints where this |
5725 | // situation exists. |
5726 | Diag(NewArgs[ArgIdx].getLocation(), |
5727 | diag::err_template_expansion_into_fixed_list) |
5728 | << (isa<ConceptDecl>(Template) ? 1 : 0) |
5729 | << NewArgs[ArgIdx].getSourceRange(); |
5730 | Diag((*Param)->getLocation(), diag::note_template_param_here); |
5731 | return true; |
5732 | } |
5733 | |
5734 | // We're now done with this argument. |
5735 | ++ArgIdx; |
5736 | |
5737 | if ((*Param)->isTemplateParameterPack()) { |
5738 | // The template parameter was a template parameter pack, so take the |
5739 | // deduced argument and place it on the argument pack. Note that we |
5740 | // stay on the same template parameter so that we can deduce more |
5741 | // arguments. |
5742 | ArgumentPack.push_back(Converted.pop_back_val()); |
5743 | } else { |
5744 | // Move to the next template parameter. |
5745 | ++Param; |
5746 | } |
5747 | |
5748 | // If we just saw a pack expansion into a non-pack, then directly convert |
5749 | // the remaining arguments, because we don't know what parameters they'll |
5750 | // match up with. |
5751 | if (PackExpansionIntoNonPack) { |
5752 | if (!ArgumentPack.empty()) { |
5753 | // If we were part way through filling in an expanded parameter pack, |
5754 | // fall back to just producing individual arguments. |
5755 | Converted.insert(Converted.end(), |
5756 | ArgumentPack.begin(), ArgumentPack.end()); |
5757 | ArgumentPack.clear(); |
5758 | } |
5759 | |
5760 | while (ArgIdx < NumArgs) { |
5761 | Converted.push_back(NewArgs[ArgIdx].getArgument()); |
5762 | ++ArgIdx; |
5763 | } |
5764 | |
5765 | return false; |
5766 | } |
5767 | |
5768 | continue; |
5769 | } |
5770 | |
5771 | // If we're checking a partial template argument list, we're done. |
5772 | if (PartialTemplateArgs) { |
5773 | if ((*Param)->isTemplateParameterPack() && !ArgumentPack.empty()) |
5774 | Converted.push_back( |
5775 | TemplateArgument::CreatePackCopy(Context, ArgumentPack)); |
5776 | return false; |
5777 | } |
5778 | |
5779 | // If we have a template parameter pack with no more corresponding |
5780 | // arguments, just break out now and we'll fill in the argument pack below. |
5781 | if ((*Param)->isTemplateParameterPack()) { |
5782 | assert(!getExpandedPackSize(*Param) &&((void)0) |
5783 | "Should have dealt with this already")((void)0); |
5784 | |
5785 | // A non-expanded parameter pack before the end of the parameter list |
5786 | // only occurs for an ill-formed template parameter list, unless we've |
5787 | // got a partial argument list for a function template, so just bail out. |
5788 | if (Param + 1 != ParamEnd) |
5789 | return true; |
5790 | |
5791 | Converted.push_back( |
5792 | TemplateArgument::CreatePackCopy(Context, ArgumentPack)); |
5793 | ArgumentPack.clear(); |
5794 | |
5795 | ++Param; |
5796 | continue; |
5797 | } |
5798 | |
5799 | // Check whether we have a default argument. |
5800 | TemplateArgumentLoc Arg; |
5801 | |
5802 | // Retrieve the default template argument from the template |
5803 | // parameter. For each kind of template parameter, we substitute the |
5804 | // template arguments provided thus far and any "outer" template arguments |
5805 | // (when the template parameter was part of a nested template) into |
5806 | // the default argument. |
5807 | if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*Param)) { |
5808 | if (!hasVisibleDefaultArgument(TTP)) |
5809 | return diagnoseMissingArgument(*this, TemplateLoc, Template, TTP, |
5810 | NewArgs); |
5811 | |
5812 | TypeSourceInfo *ArgType = SubstDefaultTemplateArgument(*this, |
5813 | Template, |
5814 | TemplateLoc, |
5815 | RAngleLoc, |
5816 | TTP, |
5817 | Converted); |
5818 | if (!ArgType) |
5819 | return true; |
5820 | |
5821 | Arg = TemplateArgumentLoc(TemplateArgument(ArgType->getType()), |
5822 | ArgType); |
5823 | } else if (NonTypeTemplateParmDecl *NTTP |
5824 | = dyn_cast<NonTypeTemplateParmDecl>(*Param)) { |
5825 | if (!hasVisibleDefaultArgument(NTTP)) |
5826 | return diagnoseMissingArgument(*this, TemplateLoc, Template, NTTP, |
5827 | NewArgs); |
5828 | |
5829 | ExprResult E = SubstDefaultTemplateArgument(*this, Template, |
5830 | TemplateLoc, |
5831 | RAngleLoc, |
5832 | NTTP, |
5833 | Converted); |
5834 | if (E.isInvalid()) |
5835 | return true; |
5836 | |
5837 | Expr *Ex = E.getAs<Expr>(); |
5838 | Arg = TemplateArgumentLoc(TemplateArgument(Ex), Ex); |
5839 | } else { |
5840 | TemplateTemplateParmDecl *TempParm |
5841 | = cast<TemplateTemplateParmDecl>(*Param); |
5842 | |
5843 | if (!hasVisibleDefaultArgument(TempParm)) |
5844 | return diagnoseMissingArgument(*this, TemplateLoc, Template, TempParm, |
5845 | NewArgs); |
5846 | |
5847 | NestedNameSpecifierLoc QualifierLoc; |
5848 | TemplateName Name = SubstDefaultTemplateArgument(*this, Template, |
5849 | TemplateLoc, |
5850 | RAngleLoc, |
5851 | TempParm, |
5852 | Converted, |
5853 | QualifierLoc); |
5854 | if (Name.isNull()) |
5855 | return true; |
5856 | |
5857 | Arg = TemplateArgumentLoc( |
5858 | Context, TemplateArgument(Name), QualifierLoc, |
5859 | TempParm->getDefaultArgument().getTemplateNameLoc()); |
5860 | } |
5861 | |
5862 | // Introduce an instantiation record that describes where we are using |
5863 | // the default template argument. We're not actually instantiating a |
5864 | // template here, we just create this object to put a note into the |
5865 | // context stack. |
5866 | InstantiatingTemplate Inst(*this, RAngleLoc, Template, *Param, Converted, |
5867 | SourceRange(TemplateLoc, RAngleLoc)); |
5868 | if (Inst.isInvalid()) |
5869 | return true; |
5870 | |
5871 | // Check the default template argument. |
5872 | if (CheckTemplateArgument(*Param, Arg, Template, TemplateLoc, |
5873 | RAngleLoc, 0, Converted)) |
5874 | return true; |
5875 | |
5876 | // Core issue 150 (assumed resolution): if this is a template template |
5877 | // parameter, keep track of the default template arguments from the |
5878 | // template definition. |
5879 | if (isTemplateTemplateParameter) |
5880 | NewArgs.addArgument(Arg); |
5881 | |
5882 | // Move to the next template parameter and argument. |
5883 | ++Param; |
5884 | ++ArgIdx; |
5885 | } |
5886 | |
5887 | // If we're performing a partial argument substitution, allow any trailing |
5888 | // pack expansions; they might be empty. This can happen even if |
5889 | // PartialTemplateArgs is false (the list of arguments is complete but |
5890 | // still dependent). |
5891 | if (ArgIdx < NumArgs && CurrentInstantiationScope && |
5892 | CurrentInstantiationScope->getPartiallySubstitutedPack()) { |
5893 | while (ArgIdx < NumArgs && NewArgs[ArgIdx].getArgument().isPackExpansion()) |
5894 | Converted.push_back(NewArgs[ArgIdx++].getArgument()); |
5895 | } |
5896 | |
5897 | // If we have any leftover arguments, then there were too many arguments. |
5898 | // Complain and fail. |
5899 | if (ArgIdx < NumArgs) { |
5900 | Diag(TemplateLoc, diag::err_template_arg_list_different_arity) |
5901 | << /*too many args*/1 |
5902 | << (int)getTemplateNameKindForDiagnostics(TemplateName(Template)) |
5903 | << Template |
5904 | << SourceRange(NewArgs[ArgIdx].getLocation(), NewArgs.getRAngleLoc()); |
5905 | Diag(Template->getLocation(), diag::note_template_decl_here) |
5906 | << Params->getSourceRange(); |
5907 | return true; |
5908 | } |
5909 | |
5910 | // No problems found with the new argument list, propagate changes back |
5911 | // to caller. |
5912 | if (UpdateArgsWithConversions) |
5913 | TemplateArgs = std::move(NewArgs); |
5914 | |
5915 | if (!PartialTemplateArgs && |
5916 | EnsureTemplateArgumentListConstraints( |
5917 | Template, Converted, SourceRange(TemplateLoc, |
5918 | TemplateArgs.getRAngleLoc()))) { |
5919 | if (ConstraintsNotSatisfied) |
5920 | *ConstraintsNotSatisfied = true; |
5921 | return true; |
5922 | } |
5923 | |
5924 | return false; |
5925 | } |
5926 | |
5927 | namespace { |
5928 | class UnnamedLocalNoLinkageFinder |
5929 | : public TypeVisitor<UnnamedLocalNoLinkageFinder, bool> |
5930 | { |
5931 | Sema &S; |
5932 | SourceRange SR; |
5933 | |
5934 | typedef TypeVisitor<UnnamedLocalNoLinkageFinder, bool> inherited; |
5935 | |
5936 | public: |
5937 | UnnamedLocalNoLinkageFinder(Sema &S, SourceRange SR) : S(S), SR(SR) { } |
5938 | |
5939 | bool Visit(QualType T) { |
5940 | return T.isNull() ? false : inherited::Visit(T.getTypePtr()); |
5941 | } |
5942 | |
5943 | #define TYPE(Class, Parent) \ |
5944 | bool Visit##Class##Type(const Class##Type *); |
5945 | #define ABSTRACT_TYPE(Class, Parent) \ |
5946 | bool Visit##Class##Type(const Class##Type *) { return false; } |
5947 | #define NON_CANONICAL_TYPE(Class, Parent) \ |
5948 | bool Visit##Class##Type(const Class##Type *) { return false; } |
5949 | #include "clang/AST/TypeNodes.inc" |
5950 | |
5951 | bool VisitTagDecl(const TagDecl *Tag); |
5952 | bool VisitNestedNameSpecifier(NestedNameSpecifier *NNS); |
5953 | }; |
5954 | } // end anonymous namespace |
5955 | |
5956 | bool UnnamedLocalNoLinkageFinder::VisitBuiltinType(const BuiltinType*) { |
5957 | return false; |
5958 | } |
5959 | |
5960 | bool UnnamedLocalNoLinkageFinder::VisitComplexType(const ComplexType* T) { |
5961 | return Visit(T->getElementType()); |
5962 | } |
5963 | |
5964 | bool UnnamedLocalNoLinkageFinder::VisitPointerType(const PointerType* T) { |
5965 | return Visit(T->getPointeeType()); |
5966 | } |
5967 | |
5968 | bool UnnamedLocalNoLinkageFinder::VisitBlockPointerType( |
5969 | const BlockPointerType* T) { |
5970 | return Visit(T->getPointeeType()); |
5971 | } |
5972 | |
5973 | bool UnnamedLocalNoLinkageFinder::VisitLValueReferenceType( |
5974 | const LValueReferenceType* T) { |
5975 | return Visit(T->getPointeeType()); |
5976 | } |
5977 | |
5978 | bool UnnamedLocalNoLinkageFinder::VisitRValueReferenceType( |
5979 | const RValueReferenceType* T) { |
5980 | return Visit(T->getPointeeType()); |
5981 | } |
5982 | |
5983 | bool UnnamedLocalNoLinkageFinder::VisitMemberPointerType( |
5984 | const MemberPointerType* T) { |
5985 | return Visit(T->getPointeeType()) || Visit(QualType(T->getClass(), 0)); |
5986 | } |
5987 | |
5988 | bool UnnamedLocalNoLinkageFinder::VisitConstantArrayType( |
5989 | const ConstantArrayType* T) { |
5990 | return Visit(T->getElementType()); |
5991 | } |
5992 | |
5993 | bool UnnamedLocalNoLinkageFinder::VisitIncompleteArrayType( |
5994 | const IncompleteArrayType* T) { |
5995 | return Visit(T->getElementType()); |
5996 | } |
5997 | |
5998 | bool UnnamedLocalNoLinkageFinder::VisitVariableArrayType( |
5999 | const VariableArrayType* T) { |
6000 | return Visit(T->getElementType()); |
6001 | } |
6002 | |
6003 | bool UnnamedLocalNoLinkageFinder::VisitDependentSizedArrayType( |
6004 | const DependentSizedArrayType* T) { |
6005 | return Visit(T->getElementType()); |
6006 | } |
6007 | |
6008 | bool UnnamedLocalNoLinkageFinder::VisitDependentSizedExtVectorType( |
6009 | const DependentSizedExtVectorType* T) { |
6010 | return Visit(T->getElementType()); |
6011 | } |
6012 | |
6013 | bool UnnamedLocalNoLinkageFinder::VisitDependentSizedMatrixType( |
6014 | const DependentSizedMatrixType *T) { |
6015 | return Visit(T->getElementType()); |
6016 | } |
6017 | |
6018 | bool UnnamedLocalNoLinkageFinder::VisitDependentAddressSpaceType( |
6019 | const DependentAddressSpaceType *T) { |
6020 | return Visit(T->getPointeeType()); |
6021 | } |
6022 | |
6023 | bool UnnamedLocalNoLinkageFinder::VisitVectorType(const VectorType* T) { |
6024 | return Visit(T->getElementType()); |
6025 | } |
6026 | |
6027 | bool UnnamedLocalNoLinkageFinder::VisitDependentVectorType( |
6028 | const DependentVectorType *T) { |
6029 | return Visit(T->getElementType()); |
6030 | } |
6031 | |
6032 | bool UnnamedLocalNoLinkageFinder::VisitExtVectorType(const ExtVectorType* T) { |
6033 | return Visit(T->getElementType()); |
6034 | } |
6035 | |
6036 | bool UnnamedLocalNoLinkageFinder::VisitConstantMatrixType( |
6037 | const ConstantMatrixType *T) { |
6038 | return Visit(T->getElementType()); |
6039 | } |
6040 | |
6041 | bool UnnamedLocalNoLinkageFinder::VisitFunctionProtoType( |
6042 | const FunctionProtoType* T) { |
6043 | for (const auto &A : T->param_types()) { |
6044 | if (Visit(A)) |
6045 | return true; |
6046 | } |
6047 | |
6048 | return Visit(T->getReturnType()); |
6049 | } |
6050 | |
6051 | bool UnnamedLocalNoLinkageFinder::VisitFunctionNoProtoType( |
6052 | const FunctionNoProtoType* T) { |
6053 | return Visit(T->getReturnType()); |
6054 | } |
6055 | |
6056 | bool UnnamedLocalNoLinkageFinder::VisitUnresolvedUsingType( |
6057 | const UnresolvedUsingType*) { |
6058 | return false; |
6059 | } |
6060 | |
6061 | bool UnnamedLocalNoLinkageFinder::VisitTypeOfExprType(const TypeOfExprType*) { |
6062 | return false; |
6063 | } |
6064 | |
6065 | bool UnnamedLocalNoLinkageFinder::VisitTypeOfType(const TypeOfType* T) { |
6066 | return Visit(T->getUnderlyingType()); |
6067 | } |
6068 | |
6069 | bool UnnamedLocalNoLinkageFinder::VisitDecltypeType(const DecltypeType*) { |
6070 | return false; |
6071 | } |
6072 | |
6073 | bool UnnamedLocalNoLinkageFinder::VisitUnaryTransformType( |
6074 | const UnaryTransformType*) { |
6075 | return false; |
6076 | } |
6077 | |
6078 | bool UnnamedLocalNoLinkageFinder::VisitAutoType(const AutoType *T) { |
6079 | return Visit(T->getDeducedType()); |
6080 | } |
6081 | |
6082 | bool UnnamedLocalNoLinkageFinder::VisitDeducedTemplateSpecializationType( |
6083 | const DeducedTemplateSpecializationType *T) { |
6084 | return Visit(T->getDeducedType()); |
6085 | } |
6086 | |
6087 | bool UnnamedLocalNoLinkageFinder::VisitRecordType(const RecordType* T) { |
6088 | return VisitTagDecl(T->getDecl()); |
6089 | } |
6090 | |
6091 | bool UnnamedLocalNoLinkageFinder::VisitEnumType(const EnumType* T) { |
6092 | return VisitTagDecl(T->getDecl()); |
6093 | } |
6094 | |
6095 | bool UnnamedLocalNoLinkageFinder::VisitTemplateTypeParmType( |
6096 | const TemplateTypeParmType*) { |
6097 | return false; |
6098 | } |
6099 | |
6100 | bool UnnamedLocalNoLinkageFinder::VisitSubstTemplateTypeParmPackType( |
6101 | const SubstTemplateTypeParmPackType *) { |
6102 | return false; |
6103 | } |
6104 | |
6105 | bool UnnamedLocalNoLinkageFinder::VisitTemplateSpecializationType( |
6106 | const TemplateSpecializationType*) { |
6107 | return false; |
6108 | } |
6109 | |
6110 | bool UnnamedLocalNoLinkageFinder::VisitInjectedClassNameType( |
6111 | const InjectedClassNameType* T) { |
6112 | return VisitTagDecl(T->getDecl()); |
6113 | } |
6114 | |
6115 | bool UnnamedLocalNoLinkageFinder::VisitDependentNameType( |
6116 | const DependentNameType* T) { |
6117 | return VisitNestedNameSpecifier(T->getQualifier()); |
6118 | } |
6119 | |
6120 | bool UnnamedLocalNoLinkageFinder::VisitDependentTemplateSpecializationType( |
6121 | const DependentTemplateSpecializationType* T) { |
6122 | if (auto *Q = T->getQualifier()) |
6123 | return VisitNestedNameSpecifier(Q); |
6124 | return false; |
6125 | } |
6126 | |
6127 | bool UnnamedLocalNoLinkageFinder::VisitPackExpansionType( |
6128 | const PackExpansionType* T) { |
6129 | return Visit(T->getPattern()); |
6130 | } |
6131 | |
6132 | bool UnnamedLocalNoLinkageFinder::VisitObjCObjectType(const ObjCObjectType *) { |
6133 | return false; |
6134 | } |
6135 | |
6136 | bool UnnamedLocalNoLinkageFinder::VisitObjCInterfaceType( |
6137 | const ObjCInterfaceType *) { |
6138 | return false; |
6139 | } |
6140 | |
6141 | bool UnnamedLocalNoLinkageFinder::VisitObjCObjectPointerType( |
6142 | const ObjCObjectPointerType *) { |
6143 | return false; |
6144 | } |
6145 | |
6146 | bool UnnamedLocalNoLinkageFinder::VisitAtomicType(const AtomicType* T) { |
6147 | return Visit(T->getValueType()); |
6148 | } |
6149 | |
6150 | bool UnnamedLocalNoLinkageFinder::VisitPipeType(const PipeType* T) { |
6151 | return false; |
6152 | } |
6153 | |
6154 | bool UnnamedLocalNoLinkageFinder::VisitExtIntType(const ExtIntType *T) { |
6155 | return false; |
6156 | } |
6157 | |
6158 | bool UnnamedLocalNoLinkageFinder::VisitDependentExtIntType( |
6159 | const DependentExtIntType *T) { |
6160 | return false; |
6161 | } |
6162 | |
6163 | bool UnnamedLocalNoLinkageFinder::VisitTagDecl(const TagDecl *Tag) { |
6164 | if (Tag->getDeclContext()->isFunctionOrMethod()) { |
6165 | S.Diag(SR.getBegin(), |
6166 | S.getLangOpts().CPlusPlus11 ? |
6167 | diag::warn_cxx98_compat_template_arg_local_type : |
6168 | diag::ext_template_arg_local_type) |
6169 | << S.Context.getTypeDeclType(Tag) << SR; |
6170 | return true; |
6171 | } |
6172 | |
6173 | if (!Tag->hasNameForLinkage()) { |
6174 | S.Diag(SR.getBegin(), |
6175 | S.getLangOpts().CPlusPlus11 ? |
6176 | diag::warn_cxx98_compat_template_arg_unnamed_type : |
6177 | diag::ext_template_arg_unnamed_type) << SR; |
6178 | S.Diag(Tag->getLocation(), diag::note_template_unnamed_type_here); |
6179 | return true; |
6180 | } |
6181 | |
6182 | return false; |
6183 | } |
6184 | |
6185 | bool UnnamedLocalNoLinkageFinder::VisitNestedNameSpecifier( |
6186 | NestedNameSpecifier *NNS) { |
6187 | assert(NNS)((void)0); |
6188 | if (NNS->getPrefix() && VisitNestedNameSpecifier(NNS->getPrefix())) |
6189 | return true; |
6190 | |
6191 | switch (NNS->getKind()) { |
6192 | case NestedNameSpecifier::Identifier: |
6193 | case NestedNameSpecifier::Namespace: |
6194 | case NestedNameSpecifier::NamespaceAlias: |
6195 | case NestedNameSpecifier::Global: |
6196 | case NestedNameSpecifier::Super: |
6197 | return false; |
6198 | |
6199 | case NestedNameSpecifier::TypeSpec: |
6200 | case NestedNameSpecifier::TypeSpecWithTemplate: |
6201 | return Visit(QualType(NNS->getAsType(), 0)); |
6202 | } |
6203 | llvm_unreachable("Invalid NestedNameSpecifier::Kind!")__builtin_unreachable(); |
6204 | } |
6205 | |
6206 | /// Check a template argument against its corresponding |
6207 | /// template type parameter. |
6208 | /// |
6209 | /// This routine implements the semantics of C++ [temp.arg.type]. It |
6210 | /// returns true if an error occurred, and false otherwise. |
6211 | bool Sema::CheckTemplateArgument(TypeSourceInfo *ArgInfo) { |
6212 | assert(ArgInfo && "invalid TypeSourceInfo")((void)0); |
6213 | QualType Arg = ArgInfo->getType(); |
6214 | SourceRange SR = ArgInfo->getTypeLoc().getSourceRange(); |
6215 | |
6216 | if (Arg->isVariablyModifiedType()) { |
6217 | return Diag(SR.getBegin(), diag::err_variably_modified_template_arg) << Arg; |
6218 | } else if (Context.hasSameUnqualifiedType(Arg, Context.OverloadTy)) { |
6219 | return Diag(SR.getBegin(), diag::err_template_arg_overload_type) << SR; |
6220 | } |
6221 | |
6222 | // C++03 [temp.arg.type]p2: |
6223 | // A local type, a type with no linkage, an unnamed type or a type |
6224 | // compounded from any of these types shall not be used as a |
6225 | // template-argument for a template type-parameter. |
6226 | // |
6227 | // C++11 allows these, and even in C++03 we allow them as an extension with |
6228 | // a warning. |
6229 | if (LangOpts.CPlusPlus11 || Arg->hasUnnamedOrLocalType()) { |
6230 | UnnamedLocalNoLinkageFinder Finder(*this, SR); |
6231 | (void)Finder.Visit(Context.getCanonicalType(Arg)); |
6232 | } |
6233 | |
6234 | return false; |
6235 | } |
6236 | |
6237 | enum NullPointerValueKind { |
6238 | NPV_NotNullPointer, |
6239 | NPV_NullPointer, |
6240 | NPV_Error |
6241 | }; |
6242 | |
6243 | /// Determine whether the given template argument is a null pointer |
6244 | /// value of the appropriate type. |
6245 | static NullPointerValueKind |
6246 | isNullPointerValueTemplateArgument(Sema &S, NonTypeTemplateParmDecl *Param, |
6247 | QualType ParamType, Expr *Arg, |
6248 | Decl *Entity = nullptr) { |
6249 | if (Arg->isValueDependent() || Arg->isTypeDependent()) |
6250 | return NPV_NotNullPointer; |
6251 | |
6252 | // dllimport'd entities aren't constant but are available inside of template |
6253 | // arguments. |
6254 | if (Entity && Entity->hasAttr<DLLImportAttr>()) |
6255 | return NPV_NotNullPointer; |
6256 | |
6257 | if (!S.isCompleteType(Arg->getExprLoc(), ParamType)) |
6258 | llvm_unreachable(__builtin_unreachable() |
6259 | "Incomplete parameter type in isNullPointerValueTemplateArgument!")__builtin_unreachable(); |
6260 | |
6261 | if (!S.getLangOpts().CPlusPlus11) |
6262 | return NPV_NotNullPointer; |
6263 | |
6264 | // Determine whether we have a constant expression. |
6265 | ExprResult ArgRV = S.DefaultFunctionArrayConversion(Arg); |
6266 | if (ArgRV.isInvalid()) |
6267 | return NPV_Error; |
6268 | Arg = ArgRV.get(); |
6269 | |
6270 | Expr::EvalResult EvalResult; |
6271 | SmallVector<PartialDiagnosticAt, 8> Notes; |
6272 | EvalResult.Diag = &Notes; |
6273 | if (!Arg->EvaluateAsRValue(EvalResult, S.Context) || |
6274 | EvalResult.HasSideEffects) { |
6275 | SourceLocation DiagLoc = Arg->getExprLoc(); |
6276 | |
6277 | // If our only note is the usual "invalid subexpression" note, just point |
6278 | // the caret at its location rather than producing an essentially |
6279 | // redundant note. |
6280 | if (Notes.size() == 1 && Notes[0].second.getDiagID() == |
6281 | diag::note_invalid_subexpr_in_const_expr) { |
6282 | DiagLoc = Notes[0].first; |
6283 | Notes.clear(); |
6284 | } |
6285 | |
6286 | S.Diag(DiagLoc, diag::err_template_arg_not_address_constant) |
6287 | << Arg->getType() << Arg->getSourceRange(); |
6288 | for (unsigned I = 0, N = Notes.size(); I != N; ++I) |
6289 | S.Diag(Notes[I].first, Notes[I].second); |
6290 | |
6291 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6292 | return NPV_Error; |
6293 | } |
6294 | |
6295 | // C++11 [temp.arg.nontype]p1: |
6296 | // - an address constant expression of type std::nullptr_t |
6297 | if (Arg->getType()->isNullPtrType()) |
6298 | return NPV_NullPointer; |
6299 | |
6300 | // - a constant expression that evaluates to a null pointer value (4.10); or |
6301 | // - a constant expression that evaluates to a null member pointer value |
6302 | // (4.11); or |
6303 | if ((EvalResult.Val.isLValue() && !EvalResult.Val.getLValueBase()) || |
6304 | (EvalResult.Val.isMemberPointer() && |
6305 | !EvalResult.Val.getMemberPointerDecl())) { |
6306 | // If our expression has an appropriate type, we've succeeded. |
6307 | bool ObjCLifetimeConversion; |
6308 | if (S.Context.hasSameUnqualifiedType(Arg->getType(), ParamType) || |
6309 | S.IsQualificationConversion(Arg->getType(), ParamType, false, |
6310 | ObjCLifetimeConversion)) |
6311 | return NPV_NullPointer; |
6312 | |
6313 | // The types didn't match, but we know we got a null pointer; complain, |
6314 | // then recover as if the types were correct. |
6315 | S.Diag(Arg->getExprLoc(), diag::err_template_arg_wrongtype_null_constant) |
6316 | << Arg->getType() << ParamType << Arg->getSourceRange(); |
6317 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6318 | return NPV_NullPointer; |
6319 | } |
6320 | |
6321 | // If we don't have a null pointer value, but we do have a NULL pointer |
6322 | // constant, suggest a cast to the appropriate type. |
6323 | if (Arg->isNullPointerConstant(S.Context, Expr::NPC_NeverValueDependent)) { |
6324 | std::string Code = "static_cast<" + ParamType.getAsString() + ">("; |
6325 | S.Diag(Arg->getExprLoc(), diag::err_template_arg_untyped_null_constant) |
6326 | << ParamType << FixItHint::CreateInsertion(Arg->getBeginLoc(), Code) |
6327 | << FixItHint::CreateInsertion(S.getLocForEndOfToken(Arg->getEndLoc()), |
6328 | ")"); |
6329 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6330 | return NPV_NullPointer; |
6331 | } |
6332 | |
6333 | // FIXME: If we ever want to support general, address-constant expressions |
6334 | // as non-type template arguments, we should return the ExprResult here to |
6335 | // be interpreted by the caller. |
6336 | return NPV_NotNullPointer; |
6337 | } |
6338 | |
6339 | /// Checks whether the given template argument is compatible with its |
6340 | /// template parameter. |
6341 | static bool CheckTemplateArgumentIsCompatibleWithParameter( |
6342 | Sema &S, NonTypeTemplateParmDecl *Param, QualType ParamType, Expr *ArgIn, |
6343 | Expr *Arg, QualType ArgType) { |
6344 | bool ObjCLifetimeConversion; |
6345 | if (ParamType->isPointerType() && |
6346 | !ParamType->castAs<PointerType>()->getPointeeType()->isFunctionType() && |
6347 | S.IsQualificationConversion(ArgType, ParamType, false, |
6348 | ObjCLifetimeConversion)) { |
6349 | // For pointer-to-object types, qualification conversions are |
6350 | // permitted. |
6351 | } else { |
6352 | if (const ReferenceType *ParamRef = ParamType->getAs<ReferenceType>()) { |
6353 | if (!ParamRef->getPointeeType()->isFunctionType()) { |
6354 | // C++ [temp.arg.nontype]p5b3: |
6355 | // For a non-type template-parameter of type reference to |
6356 | // object, no conversions apply. The type referred to by the |
6357 | // reference may be more cv-qualified than the (otherwise |
6358 | // identical) type of the template- argument. The |
6359 | // template-parameter is bound directly to the |
6360 | // template-argument, which shall be an lvalue. |
6361 | |
6362 | // FIXME: Other qualifiers? |
6363 | unsigned ParamQuals = ParamRef->getPointeeType().getCVRQualifiers(); |
6364 | unsigned ArgQuals = ArgType.getCVRQualifiers(); |
6365 | |
6366 | if ((ParamQuals | ArgQuals) != ParamQuals) { |
6367 | S.Diag(Arg->getBeginLoc(), |
6368 | diag::err_template_arg_ref_bind_ignores_quals) |
6369 | << ParamType << Arg->getType() << Arg->getSourceRange(); |
6370 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6371 | return true; |
6372 | } |
6373 | } |
6374 | } |
6375 | |
6376 | // At this point, the template argument refers to an object or |
6377 | // function with external linkage. We now need to check whether the |
6378 | // argument and parameter types are compatible. |
6379 | if (!S.Context.hasSameUnqualifiedType(ArgType, |
6380 | ParamType.getNonReferenceType())) { |
6381 | // We can't perform this conversion or binding. |
6382 | if (ParamType->isReferenceType()) |
6383 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_no_ref_bind) |
6384 | << ParamType << ArgIn->getType() << Arg->getSourceRange(); |
6385 | else |
6386 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_convertible) |
6387 | << ArgIn->getType() << ParamType << Arg->getSourceRange(); |
6388 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6389 | return true; |
6390 | } |
6391 | } |
6392 | |
6393 | return false; |
6394 | } |
6395 | |
6396 | /// Checks whether the given template argument is the address |
6397 | /// of an object or function according to C++ [temp.arg.nontype]p1. |
6398 | static bool |
6399 | CheckTemplateArgumentAddressOfObjectOrFunction(Sema &S, |
6400 | NonTypeTemplateParmDecl *Param, |
6401 | QualType ParamType, |
6402 | Expr *ArgIn, |
6403 | TemplateArgument &Converted) { |
6404 | bool Invalid = false; |
6405 | Expr *Arg = ArgIn; |
6406 | QualType ArgType = Arg->getType(); |
6407 | |
6408 | bool AddressTaken = false; |
6409 | SourceLocation AddrOpLoc; |
6410 | if (S.getLangOpts().MicrosoftExt) { |
6411 | // Microsoft Visual C++ strips all casts, allows an arbitrary number of |
6412 | // dereference and address-of operators. |
6413 | Arg = Arg->IgnoreParenCasts(); |
6414 | |
6415 | bool ExtWarnMSTemplateArg = false; |
6416 | UnaryOperatorKind FirstOpKind; |
6417 | SourceLocation FirstOpLoc; |
6418 | while (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) { |
6419 | UnaryOperatorKind UnOpKind = UnOp->getOpcode(); |
6420 | if (UnOpKind == UO_Deref) |
6421 | ExtWarnMSTemplateArg = true; |
6422 | if (UnOpKind == UO_AddrOf || UnOpKind == UO_Deref) { |
6423 | Arg = UnOp->getSubExpr()->IgnoreParenCasts(); |
6424 | if (!AddrOpLoc.isValid()) { |
6425 | FirstOpKind = UnOpKind; |
6426 | FirstOpLoc = UnOp->getOperatorLoc(); |
6427 | } |
6428 | } else |
6429 | break; |
6430 | } |
6431 | if (FirstOpLoc.isValid()) { |
6432 | if (ExtWarnMSTemplateArg) |
6433 | S.Diag(ArgIn->getBeginLoc(), diag::ext_ms_deref_template_argument) |
6434 | << ArgIn->getSourceRange(); |
6435 | |
6436 | if (FirstOpKind == UO_AddrOf) |
6437 | AddressTaken = true; |
6438 | else if (Arg->getType()->isPointerType()) { |
6439 | // We cannot let pointers get dereferenced here, that is obviously not a |
6440 | // constant expression. |
6441 | assert(FirstOpKind == UO_Deref)((void)0); |
6442 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_decl_ref) |
6443 | << Arg->getSourceRange(); |
6444 | } |
6445 | } |
6446 | } else { |
6447 | // See through any implicit casts we added to fix the type. |
6448 | Arg = Arg->IgnoreImpCasts(); |
6449 | |
6450 | // C++ [temp.arg.nontype]p1: |
6451 | // |
6452 | // A template-argument for a non-type, non-template |
6453 | // template-parameter shall be one of: [...] |
6454 | // |
6455 | // -- the address of an object or function with external |
6456 | // linkage, including function templates and function |
6457 | // template-ids but excluding non-static class members, |
6458 | // expressed as & id-expression where the & is optional if |
6459 | // the name refers to a function or array, or if the |
6460 | // corresponding template-parameter is a reference; or |
6461 | |
6462 | // In C++98/03 mode, give an extension warning on any extra parentheses. |
6463 | // See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#773 |
6464 | bool ExtraParens = false; |
6465 | while (ParenExpr *Parens = dyn_cast<ParenExpr>(Arg)) { |
6466 | if (!Invalid && !ExtraParens) { |
6467 | S.Diag(Arg->getBeginLoc(), |
6468 | S.getLangOpts().CPlusPlus11 |
6469 | ? diag::warn_cxx98_compat_template_arg_extra_parens |
6470 | : diag::ext_template_arg_extra_parens) |
6471 | << Arg->getSourceRange(); |
6472 | ExtraParens = true; |
6473 | } |
6474 | |
6475 | Arg = Parens->getSubExpr(); |
6476 | } |
6477 | |
6478 | while (SubstNonTypeTemplateParmExpr *subst = |
6479 | dyn_cast<SubstNonTypeTemplateParmExpr>(Arg)) |
6480 | Arg = subst->getReplacement()->IgnoreImpCasts(); |
6481 | |
6482 | if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) { |
6483 | if (UnOp->getOpcode() == UO_AddrOf) { |
6484 | Arg = UnOp->getSubExpr(); |
6485 | AddressTaken = true; |
6486 | AddrOpLoc = UnOp->getOperatorLoc(); |
6487 | } |
6488 | } |
6489 | |
6490 | while (SubstNonTypeTemplateParmExpr *subst = |
6491 | dyn_cast<SubstNonTypeTemplateParmExpr>(Arg)) |
6492 | Arg = subst->getReplacement()->IgnoreImpCasts(); |
6493 | } |
6494 | |
6495 | ValueDecl *Entity = nullptr; |
6496 | if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Arg)) |
6497 | Entity = DRE->getDecl(); |
6498 | else if (CXXUuidofExpr *CUE = dyn_cast<CXXUuidofExpr>(Arg)) |
6499 | Entity = CUE->getGuidDecl(); |
6500 | |
6501 | // If our parameter has pointer type, check for a null template value. |
6502 | if (ParamType->isPointerType() || ParamType->isNullPtrType()) { |
6503 | switch (isNullPointerValueTemplateArgument(S, Param, ParamType, ArgIn, |
6504 | Entity)) { |
6505 | case NPV_NullPointer: |
6506 | S.Diag(Arg->getExprLoc(), diag::warn_cxx98_compat_template_arg_null); |
6507 | Converted = TemplateArgument(S.Context.getCanonicalType(ParamType), |
6508 | /*isNullPtr=*/true); |
6509 | return false; |
6510 | |
6511 | case NPV_Error: |
6512 | return true; |
6513 | |
6514 | case NPV_NotNullPointer: |
6515 | break; |
6516 | } |
6517 | } |
6518 | |
6519 | // Stop checking the precise nature of the argument if it is value dependent, |
6520 | // it should be checked when instantiated. |
6521 | if (Arg->isValueDependent()) { |
6522 | Converted = TemplateArgument(ArgIn); |
6523 | return false; |
6524 | } |
6525 | |
6526 | if (!Entity) { |
6527 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_decl_ref) |
6528 | << Arg->getSourceRange(); |
6529 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6530 | return true; |
6531 | } |
6532 | |
6533 | // Cannot refer to non-static data members |
6534 | if (isa<FieldDecl>(Entity) || isa<IndirectFieldDecl>(Entity)) { |
6535 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_field) |
6536 | << Entity << Arg->getSourceRange(); |
6537 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6538 | return true; |
6539 | } |
6540 | |
6541 | // Cannot refer to non-static member functions |
6542 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Entity)) { |
6543 | if (!Method->isStatic()) { |
6544 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_method) |
6545 | << Method << Arg->getSourceRange(); |
6546 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6547 | return true; |
6548 | } |
6549 | } |
6550 | |
6551 | FunctionDecl *Func = dyn_cast<FunctionDecl>(Entity); |
6552 | VarDecl *Var = dyn_cast<VarDecl>(Entity); |
6553 | MSGuidDecl *Guid = dyn_cast<MSGuidDecl>(Entity); |
6554 | |
6555 | // A non-type template argument must refer to an object or function. |
6556 | if (!Func && !Var && !Guid) { |
6557 | // We found something, but we don't know specifically what it is. |
6558 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_object_or_func) |
6559 | << Arg->getSourceRange(); |
6560 | S.Diag(Entity->getLocation(), diag::note_template_arg_refers_here); |
6561 | return true; |
6562 | } |
6563 | |
6564 | // Address / reference template args must have external linkage in C++98. |
6565 | if (Entity->getFormalLinkage() == InternalLinkage) { |
6566 | S.Diag(Arg->getBeginLoc(), |
6567 | S.getLangOpts().CPlusPlus11 |
6568 | ? diag::warn_cxx98_compat_template_arg_object_internal |
6569 | : diag::ext_template_arg_object_internal) |
6570 | << !Func << Entity << Arg->getSourceRange(); |
6571 | S.Diag(Entity->getLocation(), diag::note_template_arg_internal_object) |
6572 | << !Func; |
6573 | } else if (!Entity->hasLinkage()) { |
6574 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_object_no_linkage) |
6575 | << !Func << Entity << Arg->getSourceRange(); |
6576 | S.Diag(Entity->getLocation(), diag::note_template_arg_internal_object) |
6577 | << !Func; |
6578 | return true; |
6579 | } |
6580 | |
6581 | if (Var) { |
6582 | // A value of reference type is not an object. |
6583 | if (Var->getType()->isReferenceType()) { |
6584 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_reference_var) |
6585 | << Var->getType() << Arg->getSourceRange(); |
6586 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6587 | return true; |
6588 | } |
6589 | |
6590 | // A template argument must have static storage duration. |
6591 | if (Var->getTLSKind()) { |
6592 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_thread_local) |
6593 | << Arg->getSourceRange(); |
6594 | S.Diag(Var->getLocation(), diag::note_template_arg_refers_here); |
6595 | return true; |
6596 | } |
6597 | } |
6598 | |
6599 | if (AddressTaken && ParamType->isReferenceType()) { |
6600 | // If we originally had an address-of operator, but the |
6601 | // parameter has reference type, complain and (if things look |
6602 | // like they will work) drop the address-of operator. |
6603 | if (!S.Context.hasSameUnqualifiedType(Entity->getType(), |
6604 | ParamType.getNonReferenceType())) { |
6605 | S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer) |
6606 | << ParamType; |
6607 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6608 | return true; |
6609 | } |
6610 | |
6611 | S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer) |
6612 | << ParamType |
6613 | << FixItHint::CreateRemoval(AddrOpLoc); |
6614 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6615 | |
6616 | ArgType = Entity->getType(); |
6617 | } |
6618 | |
6619 | // If the template parameter has pointer type, either we must have taken the |
6620 | // address or the argument must decay to a pointer. |
6621 | if (!AddressTaken && ParamType->isPointerType()) { |
6622 | if (Func) { |
6623 | // Function-to-pointer decay. |
6624 | ArgType = S.Context.getPointerType(Func->getType()); |
6625 | } else if (Entity->getType()->isArrayType()) { |
6626 | // Array-to-pointer decay. |
6627 | ArgType = S.Context.getArrayDecayedType(Entity->getType()); |
6628 | } else { |
6629 | // If the template parameter has pointer type but the address of |
6630 | // this object was not taken, complain and (possibly) recover by |
6631 | // taking the address of the entity. |
6632 | ArgType = S.Context.getPointerType(Entity->getType()); |
6633 | if (!S.Context.hasSameUnqualifiedType(ArgType, ParamType)) { |
6634 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_address_of) |
6635 | << ParamType; |
6636 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6637 | return true; |
6638 | } |
6639 | |
6640 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_address_of) |
6641 | << ParamType << FixItHint::CreateInsertion(Arg->getBeginLoc(), "&"); |
6642 | |
6643 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6644 | } |
6645 | } |
6646 | |
6647 | if (CheckTemplateArgumentIsCompatibleWithParameter(S, Param, ParamType, ArgIn, |
6648 | Arg, ArgType)) |
6649 | return true; |
6650 | |
6651 | // Create the template argument. |
6652 | Converted = TemplateArgument(cast<ValueDecl>(Entity->getCanonicalDecl()), |
6653 | S.Context.getCanonicalType(ParamType)); |
6654 | S.MarkAnyDeclReferenced(Arg->getBeginLoc(), Entity, false); |
6655 | return false; |
6656 | } |
6657 | |
6658 | /// Checks whether the given template argument is a pointer to |
6659 | /// member constant according to C++ [temp.arg.nontype]p1. |
6660 | static bool CheckTemplateArgumentPointerToMember(Sema &S, |
6661 | NonTypeTemplateParmDecl *Param, |
6662 | QualType ParamType, |
6663 | Expr *&ResultArg, |
6664 | TemplateArgument &Converted) { |
6665 | bool Invalid = false; |
6666 | |
6667 | Expr *Arg = ResultArg; |
6668 | bool ObjCLifetimeConversion; |
6669 | |
6670 | // C++ [temp.arg.nontype]p1: |
6671 | // |
6672 | // A template-argument for a non-type, non-template |
6673 | // template-parameter shall be one of: [...] |
6674 | // |
6675 | // -- a pointer to member expressed as described in 5.3.1. |
6676 | DeclRefExpr *DRE = nullptr; |
6677 | |
6678 | // In C++98/03 mode, give an extension warning on any extra parentheses. |
6679 | // See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#773 |
6680 | bool ExtraParens = false; |
6681 | while (ParenExpr *Parens = dyn_cast<ParenExpr>(Arg)) { |
6682 | if (!Invalid && !ExtraParens) { |
6683 | S.Diag(Arg->getBeginLoc(), |
6684 | S.getLangOpts().CPlusPlus11 |
6685 | ? diag::warn_cxx98_compat_template_arg_extra_parens |
6686 | : diag::ext_template_arg_extra_parens) |
6687 | << Arg->getSourceRange(); |
6688 | ExtraParens = true; |
6689 | } |
6690 | |
6691 | Arg = Parens->getSubExpr(); |
6692 | } |
6693 | |
6694 | while (SubstNonTypeTemplateParmExpr *subst = |
6695 | dyn_cast<SubstNonTypeTemplateParmExpr>(Arg)) |
6696 | Arg = subst->getReplacement()->IgnoreImpCasts(); |
6697 | |
6698 | // A pointer-to-member constant written &Class::member. |
6699 | if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) { |
6700 | if (UnOp->getOpcode() == UO_AddrOf) { |
6701 | DRE = dyn_cast<DeclRefExpr>(UnOp->getSubExpr()); |
6702 | if (DRE && !DRE->getQualifier()) |
6703 | DRE = nullptr; |
6704 | } |
6705 | } |
6706 | // A constant of pointer-to-member type. |
6707 | else if ((DRE = dyn_cast<DeclRefExpr>(Arg))) { |
6708 | ValueDecl *VD = DRE->getDecl(); |
6709 | if (VD->getType()->isMemberPointerType()) { |
6710 | if (isa<NonTypeTemplateParmDecl>(VD)) { |
6711 | if (Arg->isTypeDependent() || Arg->isValueDependent()) { |
6712 | Converted = TemplateArgument(Arg); |
6713 | } else { |
6714 | VD = cast<ValueDecl>(VD->getCanonicalDecl()); |
6715 | Converted = TemplateArgument(VD, ParamType); |
6716 | } |
6717 | return Invalid; |
6718 | } |
6719 | } |
6720 | |
6721 | DRE = nullptr; |
6722 | } |
6723 | |
6724 | ValueDecl *Entity = DRE ? DRE->getDecl() : nullptr; |
6725 | |
6726 | // Check for a null pointer value. |
6727 | switch (isNullPointerValueTemplateArgument(S, Param, ParamType, ResultArg, |
6728 | Entity)) { |
6729 | case NPV_Error: |
6730 | return true; |
6731 | case NPV_NullPointer: |
6732 | S.Diag(ResultArg->getExprLoc(), diag::warn_cxx98_compat_template_arg_null); |
6733 | Converted = TemplateArgument(S.Context.getCanonicalType(ParamType), |
6734 | /*isNullPtr*/true); |
6735 | return false; |
6736 | case NPV_NotNullPointer: |
6737 | break; |
6738 | } |
6739 | |
6740 | if (S.IsQualificationConversion(ResultArg->getType(), |
6741 | ParamType.getNonReferenceType(), false, |
6742 | ObjCLifetimeConversion)) { |
6743 | ResultArg = S.ImpCastExprToType(ResultArg, ParamType, CK_NoOp, |
6744 | ResultArg->getValueKind()) |
6745 | .get(); |
6746 | } else if (!S.Context.hasSameUnqualifiedType( |
6747 | ResultArg->getType(), ParamType.getNonReferenceType())) { |
6748 | // We can't perform this conversion. |
6749 | S.Diag(ResultArg->getBeginLoc(), diag::err_template_arg_not_convertible) |
6750 | << ResultArg->getType() << ParamType << ResultArg->getSourceRange(); |
6751 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6752 | return true; |
6753 | } |
6754 | |
6755 | if (!DRE) |
6756 | return S.Diag(Arg->getBeginLoc(), |
6757 | diag::err_template_arg_not_pointer_to_member_form) |
6758 | << Arg->getSourceRange(); |
6759 | |
6760 | if (isa<FieldDecl>(DRE->getDecl()) || |
6761 | isa<IndirectFieldDecl>(DRE->getDecl()) || |
6762 | isa<CXXMethodDecl>(DRE->getDecl())) { |
6763 | assert((isa<FieldDecl>(DRE->getDecl()) ||((void)0) |
6764 | isa<IndirectFieldDecl>(DRE->getDecl()) ||((void)0) |
6765 | !cast<CXXMethodDecl>(DRE->getDecl())->isStatic()) &&((void)0) |
6766 | "Only non-static member pointers can make it here")((void)0); |
6767 | |
6768 | // Okay: this is the address of a non-static member, and therefore |
6769 | // a member pointer constant. |
6770 | if (Arg->isTypeDependent() || Arg->isValueDependent()) { |
6771 | Converted = TemplateArgument(Arg); |
6772 | } else { |
6773 | ValueDecl *D = cast<ValueDecl>(DRE->getDecl()->getCanonicalDecl()); |
6774 | Converted = TemplateArgument(D, S.Context.getCanonicalType(ParamType)); |
6775 | } |
6776 | return Invalid; |
6777 | } |
6778 | |
6779 | // We found something else, but we don't know specifically what it is. |
6780 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_pointer_to_member_form) |
6781 | << Arg->getSourceRange(); |
6782 | S.Diag(DRE->getDecl()->getLocation(), diag::note_template_arg_refers_here); |
6783 | return true; |
6784 | } |
6785 | |
6786 | /// Check a template argument against its corresponding |
6787 | /// non-type template parameter. |
6788 | /// |
6789 | /// This routine implements the semantics of C++ [temp.arg.nontype]. |
6790 | /// If an error occurred, it returns ExprError(); otherwise, it |
6791 | /// returns the converted template argument. \p ParamType is the |
6792 | /// type of the non-type template parameter after it has been instantiated. |
6793 | ExprResult Sema::CheckTemplateArgument(NonTypeTemplateParmDecl *Param, |
6794 | QualType ParamType, Expr *Arg, |
6795 | TemplateArgument &Converted, |
6796 | CheckTemplateArgumentKind CTAK) { |
6797 | SourceLocation StartLoc = Arg->getBeginLoc(); |
6798 | |
6799 | // If the parameter type somehow involves auto, deduce the type now. |
6800 | DeducedType *DeducedT = ParamType->getContainedDeducedType(); |
6801 | if (getLangOpts().CPlusPlus17 && DeducedT && !DeducedT->isDeduced()) { |
6802 | // During template argument deduction, we allow 'decltype(auto)' to |
6803 | // match an arbitrary dependent argument. |
6804 | // FIXME: The language rules don't say what happens in this case. |
6805 | // FIXME: We get an opaque dependent type out of decltype(auto) if the |
6806 | // expression is merely instantiation-dependent; is this enough? |
6807 | if (CTAK == CTAK_Deduced && Arg->isTypeDependent()) { |
6808 | auto *AT = dyn_cast<AutoType>(DeducedT); |
6809 | if (AT && AT->isDecltypeAuto()) { |
6810 | Converted = TemplateArgument(Arg); |
6811 | return Arg; |
6812 | } |
6813 | } |
6814 | |
6815 | // When checking a deduced template argument, deduce from its type even if |
6816 | // the type is dependent, in order to check the types of non-type template |
6817 | // arguments line up properly in partial ordering. |
6818 | Optional<unsigned> Depth = Param->getDepth() + 1; |
6819 | Expr *DeductionArg = Arg; |
6820 | if (auto *PE = dyn_cast<PackExpansionExpr>(DeductionArg)) |
6821 | DeductionArg = PE->getPattern(); |
6822 | TypeSourceInfo *TSI = |
6823 | Context.getTrivialTypeSourceInfo(ParamType, Param->getLocation()); |
6824 | if (isa<DeducedTemplateSpecializationType>(DeducedT)) { |
6825 | InitializedEntity Entity = |
6826 | InitializedEntity::InitializeTemplateParameter(ParamType, Param); |
6827 | InitializationKind Kind = InitializationKind::CreateForInit( |
6828 | DeductionArg->getBeginLoc(), /*DirectInit*/false, DeductionArg); |
6829 | Expr *Inits[1] = {DeductionArg}; |
6830 | ParamType = |
6831 | DeduceTemplateSpecializationFromInitializer(TSI, Entity, Kind, Inits); |
6832 | if (ParamType.isNull()) |
6833 | return ExprError(); |
6834 | } else if (DeduceAutoType( |
6835 | TSI, DeductionArg, ParamType, Depth, |
6836 | // We do not check constraints right now because the |
6837 | // immediately-declared constraint of the auto type is also |
6838 | // an associated constraint, and will be checked along with |
6839 | // the other associated constraints after checking the |
6840 | // template argument list. |
6841 | /*IgnoreConstraints=*/true) == DAR_Failed) { |
6842 | Diag(Arg->getExprLoc(), |
6843 | diag::err_non_type_template_parm_type_deduction_failure) |
6844 | << Param->getDeclName() << Param->getType() << Arg->getType() |
6845 | << Arg->getSourceRange(); |
6846 | Diag(Param->getLocation(), diag::note_template_param_here); |
6847 | return ExprError(); |
6848 | } |
6849 | // CheckNonTypeTemplateParameterType will produce a diagnostic if there's |
6850 | // an error. The error message normally references the parameter |
6851 | // declaration, but here we'll pass the argument location because that's |
6852 | // where the parameter type is deduced. |
6853 | ParamType = CheckNonTypeTemplateParameterType(ParamType, Arg->getExprLoc()); |
6854 | if (ParamType.isNull()) { |
6855 | Diag(Param->getLocation(), diag::note_template_param_here); |
6856 | return ExprError(); |
6857 | } |
6858 | } |
6859 | |
6860 | // We should have already dropped all cv-qualifiers by now. |
6861 | assert(!ParamType.hasQualifiers() &&((void)0) |
6862 | "non-type template parameter type cannot be qualified")((void)0); |
6863 | |
6864 | // FIXME: When Param is a reference, should we check that Arg is an lvalue? |
6865 | if (CTAK == CTAK_Deduced && |
6866 | (ParamType->isReferenceType() |
6867 | ? !Context.hasSameType(ParamType.getNonReferenceType(), |
6868 | Arg->getType()) |
6869 | : !Context.hasSameUnqualifiedType(ParamType, Arg->getType()))) { |
6870 | // FIXME: If either type is dependent, we skip the check. This isn't |
6871 | // correct, since during deduction we're supposed to have replaced each |
6872 | // template parameter with some unique (non-dependent) placeholder. |
6873 | // FIXME: If the argument type contains 'auto', we carry on and fail the |
6874 | // type check in order to force specific types to be more specialized than |
6875 | // 'auto'. It's not clear how partial ordering with 'auto' is supposed to |
6876 | // work. Similarly for CTAD, when comparing 'A<x>' against 'A'. |
6877 | if ((ParamType->isDependentType() || Arg->isTypeDependent()) && |
6878 | !Arg->getType()->getContainedDeducedType()) { |
6879 | Converted = TemplateArgument(Arg); |
6880 | return Arg; |
6881 | } |
6882 | // FIXME: This attempts to implement C++ [temp.deduct.type]p17. Per DR1770, |
6883 | // we should actually be checking the type of the template argument in P, |
6884 | // not the type of the template argument deduced from A, against the |
6885 | // template parameter type. |
6886 | Diag(StartLoc, diag::err_deduced_non_type_template_arg_type_mismatch) |
6887 | << Arg->getType() |
6888 | << ParamType.getUnqualifiedType(); |
6889 | Diag(Param->getLocation(), diag::note_template_param_here); |
6890 | return ExprError(); |
6891 | } |
6892 | |
6893 | // If either the parameter has a dependent type or the argument is |
6894 | // type-dependent, there's nothing we can check now. The argument only |
6895 | // contains an unexpanded pack during partial ordering, and there's |
6896 | // nothing more we can check in that case. |
6897 | if (ParamType->isDependentType() || Arg->isTypeDependent() || |
6898 | Arg->containsUnexpandedParameterPack()) { |
6899 | // Force the argument to the type of the parameter to maintain invariants. |
6900 | auto *PE = dyn_cast<PackExpansionExpr>(Arg); |
6901 | if (PE) |
6902 | Arg = PE->getPattern(); |
6903 | ExprResult E = ImpCastExprToType( |
6904 | Arg, ParamType.getNonLValueExprType(Context), CK_Dependent, |
6905 | ParamType->isLValueReferenceType() ? VK_LValue |
6906 | : ParamType->isRValueReferenceType() ? VK_XValue |
6907 | : VK_PRValue); |
6908 | if (E.isInvalid()) |
6909 | return ExprError(); |
6910 | if (PE) { |
6911 | // Recreate a pack expansion if we unwrapped one. |
6912 | E = new (Context) |
6913 | PackExpansionExpr(E.get()->getType(), E.get(), PE->getEllipsisLoc(), |
6914 | PE->getNumExpansions()); |
6915 | } |
6916 | Converted = TemplateArgument(E.get()); |
6917 | return E; |
6918 | } |
6919 | |
6920 | // The initialization of the parameter from the argument is |
6921 | // a constant-evaluated context. |
6922 | EnterExpressionEvaluationContext ConstantEvaluated( |
6923 | *this, Sema::ExpressionEvaluationContext::ConstantEvaluated); |
6924 | |
6925 | if (getLangOpts().CPlusPlus17) { |
6926 | QualType CanonParamType = Context.getCanonicalType(ParamType); |
6927 | |
6928 | // Avoid making a copy when initializing a template parameter of class type |
6929 | // from a template parameter object of the same type. This is going beyond |
6930 | // the standard, but is required for soundness: in |
6931 | // template<A a> struct X { X *p; X<a> *q; }; |
6932 | // ... we need p and q to have the same type. |
6933 | // |
6934 | // Similarly, don't inject a call to a copy constructor when initializing |
6935 | // from a template parameter of the same type. |
6936 | Expr *InnerArg = Arg->IgnoreParenImpCasts(); |
6937 | if (ParamType->isRecordType() && isa<DeclRefExpr>(InnerArg) && |
6938 | Context.hasSameUnqualifiedType(ParamType, InnerArg->getType())) { |
6939 | NamedDecl *ND = cast<DeclRefExpr>(InnerArg)->getDecl(); |
6940 | if (auto *TPO = dyn_cast<TemplateParamObjectDecl>(ND)) { |
6941 | Converted = TemplateArgument(TPO, CanonParamType); |
6942 | return Arg; |
6943 | } |
6944 | if (isa<NonTypeTemplateParmDecl>(ND)) { |
6945 | Converted = TemplateArgument(Arg); |
6946 | return Arg; |
6947 | } |
6948 | } |
6949 | |
6950 | // C++17 [temp.arg.nontype]p1: |
6951 | // A template-argument for a non-type template parameter shall be |
6952 | // a converted constant expression of the type of the template-parameter. |
6953 | APValue Value; |
6954 | ExprResult ArgResult = CheckConvertedConstantExpression( |
6955 | Arg, ParamType, Value, CCEK_TemplateArg, Param); |
6956 | if (ArgResult.isInvalid()) |
6957 | return ExprError(); |
6958 | |
6959 | // For a value-dependent argument, CheckConvertedConstantExpression is |
6960 | // permitted (and expected) to be unable to determine a value. |
6961 | if (ArgResult.get()->isValueDependent()) { |
6962 | Converted = TemplateArgument(ArgResult.get()); |
6963 | return ArgResult; |
6964 | } |
6965 | |
6966 | // Convert the APValue to a TemplateArgument. |
6967 | switch (Value.getKind()) { |
6968 | case APValue::None: |
6969 | assert(ParamType->isNullPtrType())((void)0); |
6970 | Converted = TemplateArgument(CanonParamType, /*isNullPtr*/true); |
6971 | break; |
6972 | case APValue::Indeterminate: |
6973 | llvm_unreachable("result of constant evaluation should be initialized")__builtin_unreachable(); |
6974 | break; |
6975 | case APValue::Int: |
6976 | assert(ParamType->isIntegralOrEnumerationType())((void)0); |
6977 | Converted = TemplateArgument(Context, Value.getInt(), CanonParamType); |
6978 | break; |
6979 | case APValue::MemberPointer: { |
6980 | assert(ParamType->isMemberPointerType())((void)0); |
6981 | |
6982 | // FIXME: We need TemplateArgument representation and mangling for these. |
6983 | if (!Value.getMemberPointerPath().empty()) { |
6984 | Diag(Arg->getBeginLoc(), |
6985 | diag::err_template_arg_member_ptr_base_derived_not_supported) |
6986 | << Value.getMemberPointerDecl() << ParamType |
6987 | << Arg->getSourceRange(); |
6988 | return ExprError(); |
6989 | } |
6990 | |
6991 | auto *VD = const_cast<ValueDecl*>(Value.getMemberPointerDecl()); |
6992 | Converted = VD ? TemplateArgument(VD, CanonParamType) |
6993 | : TemplateArgument(CanonParamType, /*isNullPtr*/true); |
6994 | break; |
6995 | } |
6996 | case APValue::LValue: { |
6997 | // For a non-type template-parameter of pointer or reference type, |
6998 | // the value of the constant expression shall not refer to |
6999 | assert(ParamType->isPointerType() || ParamType->isReferenceType() ||((void)0) |
7000 | ParamType->isNullPtrType())((void)0); |
7001 | // -- a temporary object |
7002 | // -- a string literal |
7003 | // -- the result of a typeid expression, or |
7004 | // -- a predefined __func__ variable |
7005 | APValue::LValueBase Base = Value.getLValueBase(); |
7006 | auto *VD = const_cast<ValueDecl *>(Base.dyn_cast<const ValueDecl *>()); |
7007 | if (Base && (!VD || isa<LifetimeExtendedTemporaryDecl>(VD))) { |
7008 | Diag(Arg->getBeginLoc(), diag::err_template_arg_not_decl_ref) |
7009 | << Arg->getSourceRange(); |
7010 | return ExprError(); |
7011 | } |
7012 | // -- a subobject |
7013 | // FIXME: Until C++20 |
7014 | if (Value.hasLValuePath() && Value.getLValuePath().size() == 1 && |
7015 | VD && VD->getType()->isArrayType() && |
7016 | Value.getLValuePath()[0].getAsArrayIndex() == 0 && |
7017 | !Value.isLValueOnePastTheEnd() && ParamType->isPointerType()) { |
7018 | // Per defect report (no number yet): |
7019 | // ... other than a pointer to the first element of a complete array |
7020 | // object. |
7021 | } else if (!Value.hasLValuePath() || Value.getLValuePath().size() || |
7022 | Value.isLValueOnePastTheEnd()) { |
7023 | Diag(StartLoc, diag::err_non_type_template_arg_subobject) |
7024 | << Value.getAsString(Context, ParamType); |
7025 | return ExprError(); |
7026 | } |
7027 | assert((VD || !ParamType->isReferenceType()) &&((void)0) |
7028 | "null reference should not be a constant expression")((void)0); |
7029 | assert((!VD || !ParamType->isNullPtrType()) &&((void)0) |
7030 | "non-null value of type nullptr_t?")((void)0); |
7031 | Converted = VD ? TemplateArgument(VD, CanonParamType) |
7032 | : TemplateArgument(CanonParamType, /*isNullPtr*/true); |
7033 | break; |
7034 | } |
7035 | case APValue::Struct: |
7036 | case APValue::Union: |
7037 | // Get or create the corresponding template parameter object. |
7038 | Converted = TemplateArgument( |
7039 | Context.getTemplateParamObjectDecl(CanonParamType, Value), |
7040 | CanonParamType); |
7041 | break; |
7042 | case APValue::AddrLabelDiff: |
7043 | return Diag(StartLoc, diag::err_non_type_template_arg_addr_label_diff); |
7044 | case APValue::FixedPoint: |
7045 | case APValue::Float: |
7046 | case APValue::ComplexInt: |
7047 | case APValue::ComplexFloat: |
7048 | case APValue::Vector: |
7049 | case APValue::Array: |
7050 | return Diag(StartLoc, diag::err_non_type_template_arg_unsupported) |
7051 | << ParamType; |
7052 | } |
7053 | |
7054 | return ArgResult.get(); |
7055 | } |
7056 | |
7057 | // C++ [temp.arg.nontype]p5: |
7058 | // The following conversions are performed on each expression used |
7059 | // as a non-type template-argument. If a non-type |
7060 | // template-argument cannot be converted to the type of the |
7061 | // corresponding template-parameter then the program is |
7062 | // ill-formed. |
7063 | if (ParamType->isIntegralOrEnumerationType()) { |
7064 | // C++11: |
7065 | // -- for a non-type template-parameter of integral or |
7066 | // enumeration type, conversions permitted in a converted |
7067 | // constant expression are applied. |
7068 | // |
7069 | // C++98: |
7070 | // -- for a non-type template-parameter of integral or |
7071 | // enumeration type, integral promotions (4.5) and integral |
7072 | // conversions (4.7) are applied. |
7073 | |
7074 | if (getLangOpts().CPlusPlus11) { |
7075 | // C++ [temp.arg.nontype]p1: |
7076 | // A template-argument for a non-type, non-template template-parameter |
7077 | // shall be one of: |
7078 | // |
7079 | // -- for a non-type template-parameter of integral or enumeration |
7080 | // type, a converted constant expression of the type of the |
7081 | // template-parameter; or |
7082 | llvm::APSInt Value; |
7083 | ExprResult ArgResult = |
7084 | CheckConvertedConstantExpression(Arg, ParamType, Value, |
7085 | CCEK_TemplateArg); |
7086 | if (ArgResult.isInvalid()) |
7087 | return ExprError(); |
7088 | |
7089 | // We can't check arbitrary value-dependent arguments. |
7090 | if (ArgResult.get()->isValueDependent()) { |
7091 | Converted = TemplateArgument(ArgResult.get()); |
7092 | return ArgResult; |
7093 | } |
7094 | |
7095 | // Widen the argument value to sizeof(parameter type). This is almost |
7096 | // always a no-op, except when the parameter type is bool. In |
7097 | // that case, this may extend the argument from 1 bit to 8 bits. |
7098 | QualType IntegerType = ParamType; |
7099 | if (const EnumType *Enum = IntegerType->getAs<EnumType>()) |
7100 | IntegerType = Enum->getDecl()->getIntegerType(); |
7101 | Value = Value.extOrTrunc(IntegerType->isExtIntType() |
7102 | ? Context.getIntWidth(IntegerType) |
7103 | : Context.getTypeSize(IntegerType)); |
7104 | |
7105 | Converted = TemplateArgument(Context, Value, |
7106 | Context.getCanonicalType(ParamType)); |
7107 | return ArgResult; |
7108 | } |
7109 | |
7110 | ExprResult ArgResult = DefaultLvalueConversion(Arg); |
7111 | if (ArgResult.isInvalid()) |
7112 | return ExprError(); |
7113 | Arg = ArgResult.get(); |
7114 | |
7115 | QualType ArgType = Arg->getType(); |
7116 | |
7117 | // C++ [temp.arg.nontype]p1: |
7118 | // A template-argument for a non-type, non-template |
7119 | // template-parameter shall be one of: |
7120 | // |
7121 | // -- an integral constant-expression of integral or enumeration |
7122 | // type; or |
7123 | // -- the name of a non-type template-parameter; or |
7124 | llvm::APSInt Value; |
7125 | if (!ArgType->isIntegralOrEnumerationType()) { |
7126 | Diag(Arg->getBeginLoc(), diag::err_template_arg_not_integral_or_enumeral) |
7127 | << ArgType << Arg->getSourceRange(); |
7128 | Diag(Param->getLocation(), diag::note_template_param_here); |
7129 | return ExprError(); |
7130 | } else if (!Arg->isValueDependent()) { |
7131 | class TmplArgICEDiagnoser : public VerifyICEDiagnoser { |
7132 | QualType T; |
7133 | |
7134 | public: |
7135 | TmplArgICEDiagnoser(QualType T) : T(T) { } |
7136 | |
7137 | SemaDiagnosticBuilder diagnoseNotICE(Sema &S, |
7138 | SourceLocation Loc) override { |
7139 | return S.Diag(Loc, diag::err_template_arg_not_ice) << T; |
7140 | } |
7141 | } Diagnoser(ArgType); |
7142 | |
7143 | Arg = VerifyIntegerConstantExpression(Arg, &Value, Diagnoser).get(); |
7144 | if (!Arg) |
7145 | return ExprError(); |
7146 | } |
7147 | |
7148 | // From here on out, all we care about is the unqualified form |
7149 | // of the argument type. |
7150 | ArgType = ArgType.getUnqualifiedType(); |
7151 | |
7152 | // Try to convert the argument to the parameter's type. |
7153 | if (Context.hasSameType(ParamType, ArgType)) { |
7154 | // Okay: no conversion necessary |
7155 | } else if (ParamType->isBooleanType()) { |
7156 | // This is an integral-to-boolean conversion. |
7157 | Arg = ImpCastExprToType(Arg, ParamType, CK_IntegralToBoolean).get(); |
7158 | } else if (IsIntegralPromotion(Arg, ArgType, ParamType) || |
7159 | !ParamType->isEnumeralType()) { |
7160 | // This is an integral promotion or conversion. |
7161 | Arg = ImpCastExprToType(Arg, ParamType, CK_IntegralCast).get(); |
7162 | } else { |
7163 | // We can't perform this conversion. |
7164 | Diag(Arg->getBeginLoc(), diag::err_template_arg_not_convertible) |
7165 | << Arg->getType() << ParamType << Arg->getSourceRange(); |
7166 | Diag(Param->getLocation(), diag::note_template_param_here); |
7167 | return ExprError(); |
7168 | } |
7169 | |
7170 | // Add the value of this argument to the list of converted |
7171 | // arguments. We use the bitwidth and signedness of the template |
7172 | // parameter. |
7173 | if (Arg->isValueDependent()) { |
7174 | // The argument is value-dependent. Create a new |
7175 | // TemplateArgument with the converted expression. |
7176 | Converted = TemplateArgument(Arg); |
7177 | return Arg; |
7178 | } |
7179 | |
7180 | QualType IntegerType = Context.getCanonicalType(ParamType); |
7181 | if (const EnumType *Enum = IntegerType->getAs<EnumType>()) |
7182 | IntegerType = Context.getCanonicalType(Enum->getDecl()->getIntegerType()); |
7183 | |
7184 | if (ParamType->isBooleanType()) { |
7185 | // Value must be zero or one. |
7186 | Value = Value != 0; |
7187 | unsigned AllowedBits = Context.getTypeSize(IntegerType); |
7188 | if (Value.getBitWidth() != AllowedBits) |
7189 | Value = Value.extOrTrunc(AllowedBits); |
7190 | Value.setIsSigned(IntegerType->isSignedIntegerOrEnumerationType()); |
7191 | } else { |
7192 | llvm::APSInt OldValue = Value; |
7193 | |
7194 | // Coerce the template argument's value to the value it will have |
7195 | // based on the template parameter's type. |
7196 | unsigned AllowedBits = IntegerType->isExtIntType() |
7197 | ? Context.getIntWidth(IntegerType) |
7198 | : Context.getTypeSize(IntegerType); |
7199 | if (Value.getBitWidth() != AllowedBits) |
7200 | Value = Value.extOrTrunc(AllowedBits); |
7201 | Value.setIsSigned(IntegerType->isSignedIntegerOrEnumerationType()); |
7202 | |
7203 | // Complain if an unsigned parameter received a negative value. |
7204 | if (IntegerType->isUnsignedIntegerOrEnumerationType() && |
7205 | (OldValue.isSigned() && OldValue.isNegative())) { |
7206 | Diag(Arg->getBeginLoc(), diag::warn_template_arg_negative) |
7207 | << toString(OldValue, 10) << toString(Value, 10) << Param->getType() |
7208 | << Arg->getSourceRange(); |
7209 | Diag(Param->getLocation(), diag::note_template_param_here); |
7210 | } |
7211 | |
7212 | // Complain if we overflowed the template parameter's type. |
7213 | unsigned RequiredBits; |
7214 | if (IntegerType->isUnsignedIntegerOrEnumerationType()) |
7215 | RequiredBits = OldValue.getActiveBits(); |
7216 | else if (OldValue.isUnsigned()) |
7217 | RequiredBits = OldValue.getActiveBits() + 1; |
7218 | else |
7219 | RequiredBits = OldValue.getMinSignedBits(); |
7220 | if (RequiredBits > AllowedBits) { |
7221 | Diag(Arg->getBeginLoc(), diag::warn_template_arg_too_large) |
7222 | << toString(OldValue, 10) << toString(Value, 10) << Param->getType() |
7223 | << Arg->getSourceRange(); |
7224 | Diag(Param->getLocation(), diag::note_template_param_here); |
7225 | } |
7226 | } |
7227 | |
7228 | Converted = TemplateArgument(Context, Value, |
7229 | ParamType->isEnumeralType() |
7230 | ? Context.getCanonicalType(ParamType) |
7231 | : IntegerType); |
7232 | return Arg; |
7233 | } |
7234 | |
7235 | QualType ArgType = Arg->getType(); |
7236 | DeclAccessPair FoundResult; // temporary for ResolveOverloadedFunction |
7237 | |
7238 | // Handle pointer-to-function, reference-to-function, and |
7239 | // pointer-to-member-function all in (roughly) the same way. |
7240 | if (// -- For a non-type template-parameter of type pointer to |
7241 | // function, only the function-to-pointer conversion (4.3) is |
7242 | // applied. If the template-argument represents a set of |
7243 | // overloaded functions (or a pointer to such), the matching |
7244 | // function is selected from the set (13.4). |
7245 | (ParamType->isPointerType() && |
7246 | ParamType->castAs<PointerType>()->getPointeeType()->isFunctionType()) || |
7247 | // -- For a non-type template-parameter of type reference to |
7248 | // function, no conversions apply. If the template-argument |
7249 | // represents a set of overloaded functions, the matching |
7250 | // function is selected from the set (13.4). |
7251 | (ParamType->isReferenceType() && |
7252 | ParamType->castAs<ReferenceType>()->getPointeeType()->isFunctionType()) || |
7253 | // -- For a non-type template-parameter of type pointer to |
7254 | // member function, no conversions apply. If the |
7255 | // template-argument represents a set of overloaded member |
7256 | // functions, the matching member function is selected from |
7257 | // the set (13.4). |
7258 | (ParamType->isMemberPointerType() && |
7259 | ParamType->castAs<MemberPointerType>()->getPointeeType() |
7260 | ->isFunctionType())) { |
7261 | |
7262 | if (Arg->getType() == Context.OverloadTy) { |
7263 | if (FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Arg, ParamType, |
7264 | true, |
7265 | FoundResult)) { |
7266 | if (DiagnoseUseOfDecl(Fn, Arg->getBeginLoc())) |
7267 | return ExprError(); |
7268 | |
7269 | Arg = FixOverloadedFunctionReference(Arg, FoundResult, Fn); |
7270 | ArgType = Arg->getType(); |
7271 | } else |
7272 | return ExprError(); |
7273 | } |
7274 | |
7275 | if (!ParamType->isMemberPointerType()) { |
7276 | if (CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param, |
7277 | ParamType, |
7278 | Arg, Converted)) |
7279 | return ExprError(); |
7280 | return Arg; |
7281 | } |
7282 | |
7283 | if (CheckTemplateArgumentPointerToMember(*this, Param, ParamType, Arg, |
7284 | Converted)) |
7285 | return ExprError(); |
7286 | return Arg; |
7287 | } |
7288 | |
7289 | if (ParamType->isPointerType()) { |
7290 | // -- for a non-type template-parameter of type pointer to |
7291 | // object, qualification conversions (4.4) and the |
7292 | // array-to-pointer conversion (4.2) are applied. |
7293 | // C++0x also allows a value of std::nullptr_t. |
7294 | assert(ParamType->getPointeeType()->isIncompleteOrObjectType() &&((void)0) |
7295 | "Only object pointers allowed here")((void)0); |
7296 | |
7297 | if (CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param, |
7298 | ParamType, |
7299 | Arg, Converted)) |
7300 | return ExprError(); |
7301 | return Arg; |
7302 | } |
7303 | |
7304 | if (const ReferenceType *ParamRefType = ParamType->getAs<ReferenceType>()) { |
7305 | // -- For a non-type template-parameter of type reference to |
7306 | // object, no conversions apply. The type referred to by the |
7307 | // reference may be more cv-qualified than the (otherwise |
7308 | // identical) type of the template-argument. The |
7309 | // template-parameter is bound directly to the |
7310 | // template-argument, which must be an lvalue. |
7311 | assert(ParamRefType->getPointeeType()->isIncompleteOrObjectType() &&((void)0) |
7312 | "Only object references allowed here")((void)0); |
7313 | |
7314 | if (Arg->getType() == Context.OverloadTy) { |
7315 | if (FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Arg, |
7316 | ParamRefType->getPointeeType(), |
7317 | true, |
7318 | FoundResult)) { |
7319 | if (DiagnoseUseOfDecl(Fn, Arg->getBeginLoc())) |
7320 | return ExprError(); |
7321 | |
7322 | Arg = FixOverloadedFunctionReference(Arg, FoundResult, Fn); |
7323 | ArgType = Arg->getType(); |
7324 | } else |
7325 | return ExprError(); |
7326 | } |
7327 | |
7328 | if (CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param, |
7329 | ParamType, |
7330 | Arg, Converted)) |
7331 | return ExprError(); |
7332 | return Arg; |
7333 | } |
7334 | |
7335 | // Deal with parameters of type std::nullptr_t. |
7336 | if (ParamType->isNullPtrType()) { |
7337 | if (Arg->isTypeDependent() || Arg->isValueDependent()) { |
7338 | Converted = TemplateArgument(Arg); |
7339 | return Arg; |
7340 | } |
7341 | |
7342 | switch (isNullPointerValueTemplateArgument(*this, Param, ParamType, Arg)) { |
7343 | case NPV_NotNullPointer: |
7344 | Diag(Arg->getExprLoc(), diag::err_template_arg_not_convertible) |
7345 | << Arg->getType() << ParamType; |
7346 | Diag(Param->getLocation(), diag::note_template_param_here); |
7347 | return ExprError(); |
7348 | |
7349 | case NPV_Error: |
7350 | return ExprError(); |
7351 | |
7352 | case NPV_NullPointer: |
7353 | Diag(Arg->getExprLoc(), diag::warn_cxx98_compat_template_arg_null); |
7354 | Converted = TemplateArgument(Context.getCanonicalType(ParamType), |
7355 | /*isNullPtr*/true); |
7356 | return Arg; |
7357 | } |
7358 | } |
7359 | |
7360 | // -- For a non-type template-parameter of type pointer to data |
7361 | // member, qualification conversions (4.4) are applied. |
7362 | assert(ParamType->isMemberPointerType() && "Only pointers to members remain")((void)0); |
7363 | |
7364 | if (CheckTemplateArgumentPointerToMember(*this, Param, ParamType, Arg, |
7365 | Converted)) |
7366 | return ExprError(); |
7367 | return Arg; |
7368 | } |
7369 | |
7370 | static void DiagnoseTemplateParameterListArityMismatch( |
7371 | Sema &S, TemplateParameterList *New, TemplateParameterList *Old, |
7372 | Sema::TemplateParameterListEqualKind Kind, SourceLocation TemplateArgLoc); |
7373 | |
7374 | /// Check a template argument against its corresponding |
7375 | /// template template parameter. |
7376 | /// |
7377 | /// This routine implements the semantics of C++ [temp.arg.template]. |
7378 | /// It returns true if an error occurred, and false otherwise. |
7379 | bool Sema::CheckTemplateTemplateArgument(TemplateTemplateParmDecl *Param, |
7380 | TemplateParameterList *Params, |
7381 | TemplateArgumentLoc &Arg) { |
7382 | TemplateName Name = Arg.getArgument().getAsTemplateOrTemplatePattern(); |
7383 | TemplateDecl *Template = Name.getAsTemplateDecl(); |
7384 | if (!Template) { |
7385 | // Any dependent template name is fine. |
7386 | assert(Name.isDependent() && "Non-dependent template isn't a declaration?")((void)0); |
7387 | return false; |
7388 | } |
7389 | |
7390 | if (Template->isInvalidDecl()) |
7391 | return true; |
7392 | |
7393 | // C++0x [temp.arg.template]p1: |
7394 | // A template-argument for a template template-parameter shall be |
7395 | // the name of a class template or an alias template, expressed as an |
7396 | // id-expression. When the template-argument names a class template, only |
7397 | // primary class templates are considered when matching the |
7398 | // template template argument with the corresponding parameter; |
7399 | // partial specializations are not considered even if their |
7400 | // parameter lists match that of the template template parameter. |
7401 | // |
7402 | // Note that we also allow template template parameters here, which |
7403 | // will happen when we are dealing with, e.g., class template |
7404 | // partial specializations. |
7405 | if (!isa<ClassTemplateDecl>(Template) && |
7406 | !isa<TemplateTemplateParmDecl>(Template) && |
7407 | !isa<TypeAliasTemplateDecl>(Template) && |
7408 | !isa<BuiltinTemplateDecl>(Template)) { |
7409 | assert(isa<FunctionTemplateDecl>(Template) &&((void)0) |
7410 | "Only function templates are possible here")((void)0); |
7411 | Diag(Arg.getLocation(), diag::err_template_arg_not_valid_template); |
7412 | Diag(Template->getLocation(), diag::note_template_arg_refers_here_func) |
7413 | << Template; |
7414 | } |
7415 | |
7416 | // C++1z [temp.arg.template]p3: (DR 150) |
7417 | // A template-argument matches a template template-parameter P when P |
7418 | // is at least as specialized as the template-argument A. |
7419 | // FIXME: We should enable RelaxedTemplateTemplateArgs by default as it is a |
7420 | // defect report resolution from C++17 and shouldn't be introduced by |
7421 | // concepts. |
7422 | if (getLangOpts().RelaxedTemplateTemplateArgs) { |
7423 | // Quick check for the common case: |
7424 | // If P contains a parameter pack, then A [...] matches P if each of A's |
7425 | // template parameters matches the corresponding template parameter in |
7426 | // the template-parameter-list of P. |
7427 | if (TemplateParameterListsAreEqual( |
7428 | Template->getTemplateParameters(), Params, false, |
7429 | TPL_TemplateTemplateArgumentMatch, Arg.getLocation()) && |
7430 | // If the argument has no associated constraints, then the parameter is |
7431 | // definitely at least as specialized as the argument. |
7432 | // Otherwise - we need a more thorough check. |
7433 | !Template->hasAssociatedConstraints()) |
7434 | return false; |
7435 | |
7436 | if (isTemplateTemplateParameterAtLeastAsSpecializedAs(Params, Template, |
7437 | Arg.getLocation())) { |
7438 | // C++2a[temp.func.order]p2 |
7439 | // [...] If both deductions succeed, the partial ordering selects the |
7440 | // more constrained template as described by the rules in |
7441 | // [temp.constr.order]. |
7442 | SmallVector<const Expr *, 3> ParamsAC, TemplateAC; |
7443 | Params->getAssociatedConstraints(ParamsAC); |
7444 | // C++2a[temp.arg.template]p3 |
7445 | // [...] In this comparison, if P is unconstrained, the constraints on A |
7446 | // are not considered. |
7447 | if (ParamsAC.empty()) |
7448 | return false; |
7449 | Template->getAssociatedConstraints(TemplateAC); |
7450 | bool IsParamAtLeastAsConstrained; |
7451 | if (IsAtLeastAsConstrained(Param, ParamsAC, Template, TemplateAC, |
7452 | IsParamAtLeastAsConstrained)) |
7453 | return true; |
7454 | if (!IsParamAtLeastAsConstrained) { |
7455 | Diag(Arg.getLocation(), |
7456 | diag::err_template_template_parameter_not_at_least_as_constrained) |
7457 | << Template << Param << Arg.getSourceRange(); |
7458 | Diag(Param->getLocation(), diag::note_entity_declared_at) << Param; |
7459 | Diag(Template->getLocation(), diag::note_entity_declared_at) |
7460 | << Template; |
7461 | MaybeEmitAmbiguousAtomicConstraintsDiagnostic(Param, ParamsAC, Template, |
7462 | TemplateAC); |
7463 | return true; |
7464 | } |
7465 | return false; |
7466 | } |
7467 | // FIXME: Produce better diagnostics for deduction failures. |
7468 | } |
7469 | |
7470 | return !TemplateParameterListsAreEqual(Template->getTemplateParameters(), |
7471 | Params, |
7472 | true, |
7473 | TPL_TemplateTemplateArgumentMatch, |
7474 | Arg.getLocation()); |
7475 | } |
7476 | |
7477 | /// Given a non-type template argument that refers to a |
7478 | /// declaration and the type of its corresponding non-type template |
7479 | /// parameter, produce an expression that properly refers to that |
7480 | /// declaration. |
7481 | ExprResult |
7482 | Sema::BuildExpressionFromDeclTemplateArgument(const TemplateArgument &Arg, |
7483 | QualType ParamType, |
7484 | SourceLocation Loc) { |
7485 | // C++ [temp.param]p8: |
7486 | // |
7487 | // A non-type template-parameter of type "array of T" or |
7488 | // "function returning T" is adjusted to be of type "pointer to |
7489 | // T" or "pointer to function returning T", respectively. |
7490 | if (ParamType->isArrayType()) |
7491 | ParamType = Context.getArrayDecayedType(ParamType); |
7492 | else if (ParamType->isFunctionType()) |
7493 | ParamType = Context.getPointerType(ParamType); |
7494 | |
7495 | // For a NULL non-type template argument, return nullptr casted to the |
7496 | // parameter's type. |
7497 | if (Arg.getKind() == TemplateArgument::NullPtr) { |
7498 | return ImpCastExprToType( |
7499 | new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc), |
7500 | ParamType, |
7501 | ParamType->getAs<MemberPointerType>() |
7502 | ? CK_NullToMemberPointer |
7503 | : CK_NullToPointer); |
7504 | } |
7505 | assert(Arg.getKind() == TemplateArgument::Declaration &&((void)0) |
7506 | "Only declaration template arguments permitted here")((void)0); |
7507 | |
7508 | ValueDecl *VD = Arg.getAsDecl(); |
7509 | |
7510 | CXXScopeSpec SS; |
7511 | if (ParamType->isMemberPointerType()) { |
7512 | // If this is a pointer to member, we need to use a qualified name to |
7513 | // form a suitable pointer-to-member constant. |
7514 | assert(VD->getDeclContext()->isRecord() &&((void)0) |
7515 | (isa<CXXMethodDecl>(VD) || isa<FieldDecl>(VD) ||((void)0) |
7516 | isa<IndirectFieldDecl>(VD)))((void)0); |
7517 | QualType ClassType |
7518 | = Context.getTypeDeclType(cast<RecordDecl>(VD->getDeclContext())); |
7519 | NestedNameSpecifier *Qualifier |
7520 | = NestedNameSpecifier::Create(Context, nullptr, false, |
7521 | ClassType.getTypePtr()); |
7522 | SS.MakeTrivial(Context, Qualifier, Loc); |
7523 | } |
7524 | |
7525 | ExprResult RefExpr = BuildDeclarationNameExpr( |
7526 | SS, DeclarationNameInfo(VD->getDeclName(), Loc), VD); |
7527 | if (RefExpr.isInvalid()) |
7528 | return ExprError(); |
7529 | |
7530 | // For a pointer, the argument declaration is the pointee. Take its address. |
7531 | QualType ElemT(RefExpr.get()->getType()->getArrayElementTypeNoTypeQual(), 0); |
7532 | if (ParamType->isPointerType() && !ElemT.isNull() && |
7533 | Context.hasSimilarType(ElemT, ParamType->getPointeeType())) { |
7534 | // Decay an array argument if we want a pointer to its first element. |
7535 | RefExpr = DefaultFunctionArrayConversion(RefExpr.get()); |
7536 | if (RefExpr.isInvalid()) |
7537 | return ExprError(); |
7538 | } else if (ParamType->isPointerType() || ParamType->isMemberPointerType()) { |
7539 | // For any other pointer, take the address (or form a pointer-to-member). |
7540 | RefExpr = CreateBuiltinUnaryOp(Loc, UO_AddrOf, RefExpr.get()); |
7541 | if (RefExpr.isInvalid()) |
7542 | return ExprError(); |
7543 | } else if (ParamType->isRecordType()) { |
7544 | assert(isa<TemplateParamObjectDecl>(VD) &&((void)0) |
7545 | "arg for class template param not a template parameter object")((void)0); |
7546 | // No conversions apply in this case. |
7547 | return RefExpr; |
7548 | } else { |
7549 | assert(ParamType->isReferenceType() &&((void)0) |
7550 | "unexpected type for decl template argument")((void)0); |
7551 | } |
7552 | |
7553 | // At this point we should have the right value category. |
7554 | assert(ParamType->isReferenceType() == RefExpr.get()->isLValue() &&((void)0) |
7555 | "value kind mismatch for non-type template argument")((void)0); |
7556 | |
7557 | // The type of the template parameter can differ from the type of the |
7558 | // argument in various ways; convert it now if necessary. |
7559 | QualType DestExprType = ParamType.getNonLValueExprType(Context); |
7560 | if (!Context.hasSameType(RefExpr.get()->getType(), DestExprType)) { |
7561 | CastKind CK; |
7562 | QualType Ignored; |
7563 | if (Context.hasSimilarType(RefExpr.get()->getType(), DestExprType) || |
7564 | IsFunctionConversion(RefExpr.get()->getType(), DestExprType, Ignored)) { |
7565 | CK = CK_NoOp; |
7566 | } else if (ParamType->isVoidPointerType() && |
7567 | RefExpr.get()->getType()->isPointerType()) { |
7568 | CK = CK_BitCast; |
7569 | } else { |
7570 | // FIXME: Pointers to members can need conversion derived-to-base or |
7571 | // base-to-derived conversions. We currently don't retain enough |
7572 | // information to convert properly (we need to track a cast path or |
7573 | // subobject number in the template argument). |
7574 | llvm_unreachable(__builtin_unreachable() |
7575 | "unexpected conversion required for non-type template argument")__builtin_unreachable(); |
7576 | } |
7577 | RefExpr = ImpCastExprToType(RefExpr.get(), DestExprType, CK, |
7578 | RefExpr.get()->getValueKind()); |
7579 | } |
7580 | |
7581 | return RefExpr; |
7582 | } |
7583 | |
7584 | /// Construct a new expression that refers to the given |
7585 | /// integral template argument with the given source-location |
7586 | /// information. |
7587 | /// |
7588 | /// This routine takes care of the mapping from an integral template |
7589 | /// argument (which may have any integral type) to the appropriate |
7590 | /// literal value. |
7591 | ExprResult |
7592 | Sema::BuildExpressionFromIntegralTemplateArgument(const TemplateArgument &Arg, |
7593 | SourceLocation Loc) { |
7594 | assert(Arg.getKind() == TemplateArgument::Integral &&((void)0) |
7595 | "Operation is only valid for integral template arguments")((void)0); |
7596 | QualType OrigT = Arg.getIntegralType(); |
7597 | |
7598 | // If this is an enum type that we're instantiating, we need to use an integer |
7599 | // type the same size as the enumerator. We don't want to build an |
7600 | // IntegerLiteral with enum type. The integer type of an enum type can be of |
7601 | // any integral type with C++11 enum classes, make sure we create the right |
7602 | // type of literal for it. |
7603 | QualType T = OrigT; |
7604 | if (const EnumType *ET = OrigT->getAs<EnumType>()) |
7605 | T = ET->getDecl()->getIntegerType(); |
7606 | |
7607 | Expr *E; |
7608 | if (T->isAnyCharacterType()) { |
7609 | CharacterLiteral::CharacterKind Kind; |
7610 | if (T->isWideCharType()) |
7611 | Kind = CharacterLiteral::Wide; |
7612 | else if (T->isChar8Type() && getLangOpts().Char8) |
7613 | Kind = CharacterLiteral::UTF8; |
7614 | else if (T->isChar16Type()) |
7615 | Kind = CharacterLiteral::UTF16; |
7616 | else if (T->isChar32Type()) |
7617 | Kind = CharacterLiteral::UTF32; |
7618 | else |
7619 | Kind = CharacterLiteral::Ascii; |
7620 | |
7621 | E = new (Context) CharacterLiteral(Arg.getAsIntegral().getZExtValue(), |
7622 | Kind, T, Loc); |
7623 | } else if (T->isBooleanType()) { |
7624 | E = new (Context) CXXBoolLiteralExpr(Arg.getAsIntegral().getBoolValue(), |
7625 | T, Loc); |
7626 | } else if (T->isNullPtrType()) { |
7627 | E = new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc); |
7628 | } else { |
7629 | E = IntegerLiteral::Create(Context, Arg.getAsIntegral(), T, Loc); |
7630 | } |
7631 | |
7632 | if (OrigT->isEnumeralType()) { |
7633 | // FIXME: This is a hack. We need a better way to handle substituted |
7634 | // non-type template parameters. |
7635 | E = CStyleCastExpr::Create(Context, OrigT, VK_PRValue, CK_IntegralCast, E, |
7636 | nullptr, CurFPFeatureOverrides(), |
7637 | Context.getTrivialTypeSourceInfo(OrigT, Loc), |
7638 | Loc, Loc); |
7639 | } |
7640 | |
7641 | return E; |
7642 | } |
7643 | |
7644 | /// Match two template parameters within template parameter lists. |
7645 | static bool MatchTemplateParameterKind(Sema &S, NamedDecl *New, NamedDecl *Old, |
7646 | bool Complain, |
7647 | Sema::TemplateParameterListEqualKind Kind, |
7648 | SourceLocation TemplateArgLoc) { |
7649 | // Check the actual kind (type, non-type, template). |
7650 | if (Old->getKind() != New->getKind()) { |
7651 | if (Complain) { |
7652 | unsigned NextDiag = diag::err_template_param_different_kind; |
7653 | if (TemplateArgLoc.isValid()) { |
7654 | S.Diag(TemplateArgLoc, diag::err_template_arg_template_params_mismatch); |
7655 | NextDiag = diag::note_template_param_different_kind; |
7656 | } |
7657 | S.Diag(New->getLocation(), NextDiag) |
7658 | << (Kind != Sema::TPL_TemplateMatch); |
7659 | S.Diag(Old->getLocation(), diag::note_template_prev_declaration) |
7660 | << (Kind != Sema::TPL_TemplateMatch); |
7661 | } |
7662 | |
7663 | return false; |
7664 | } |
7665 | |
7666 | // Check that both are parameter packs or neither are parameter packs. |
7667 | // However, if we are matching a template template argument to a |
7668 | // template template parameter, the template template parameter can have |
7669 | // a parameter pack where the template template argument does not. |
7670 | if (Old->isTemplateParameterPack() != New->isTemplateParameterPack() && |
7671 | !(Kind == Sema::TPL_TemplateTemplateArgumentMatch && |
7672 | Old->isTemplateParameterPack())) { |
7673 | if (Complain) { |
7674 | unsigned NextDiag = diag::err_template_parameter_pack_non_pack; |
7675 | if (TemplateArgLoc.isValid()) { |
7676 | S.Diag(TemplateArgLoc, |
7677 | diag::err_template_arg_template_params_mismatch); |
7678 | NextDiag = diag::note_template_parameter_pack_non_pack; |
7679 | } |
7680 | |
7681 | unsigned ParamKind = isa<TemplateTypeParmDecl>(New)? 0 |
7682 | : isa<NonTypeTemplateParmDecl>(New)? 1 |
7683 | : 2; |
7684 | S.Diag(New->getLocation(), NextDiag) |
7685 | << ParamKind << New->isParameterPack(); |
7686 | S.Diag(Old->getLocation(), diag::note_template_parameter_pack_here) |
7687 | << ParamKind << Old->isParameterPack(); |
7688 | } |
7689 | |
7690 | return false; |
7691 | } |
7692 | |
7693 | // For non-type template parameters, check the type of the parameter. |
7694 | if (NonTypeTemplateParmDecl *OldNTTP |
7695 | = dyn_cast<NonTypeTemplateParmDecl>(Old)) { |
7696 | NonTypeTemplateParmDecl *NewNTTP = cast<NonTypeTemplateParmDecl>(New); |
7697 | |
7698 | // If we are matching a template template argument to a template |
7699 | // template parameter and one of the non-type template parameter types |
7700 | // is dependent, then we must wait until template instantiation time |
7701 | // to actually compare the arguments. |
7702 | if (Kind != Sema::TPL_TemplateTemplateArgumentMatch || |
7703 | (!OldNTTP->getType()->isDependentType() && |
7704 | !NewNTTP->getType()->isDependentType())) |
7705 | if (!S.Context.hasSameType(OldNTTP->getType(), NewNTTP->getType())) { |
7706 | if (Complain) { |
7707 | unsigned NextDiag = diag::err_template_nontype_parm_different_type; |
7708 | if (TemplateArgLoc.isValid()) { |
7709 | S.Diag(TemplateArgLoc, |
7710 | diag::err_template_arg_template_params_mismatch); |
7711 | NextDiag = diag::note_template_nontype_parm_different_type; |
7712 | } |
7713 | S.Diag(NewNTTP->getLocation(), NextDiag) |
7714 | << NewNTTP->getType() |
7715 | << (Kind != Sema::TPL_TemplateMatch); |
7716 | S.Diag(OldNTTP->getLocation(), |
7717 | diag::note_template_nontype_parm_prev_declaration) |
7718 | << OldNTTP->getType(); |
7719 | } |
7720 | |
7721 | return false; |
7722 | } |
7723 | } |
7724 | // For template template parameters, check the template parameter types. |
7725 | // The template parameter lists of template template |
7726 | // parameters must agree. |
7727 | else if (TemplateTemplateParmDecl *OldTTP |
7728 | = dyn_cast<TemplateTemplateParmDecl>(Old)) { |
7729 | TemplateTemplateParmDecl *NewTTP = cast<TemplateTemplateParmDecl>(New); |
7730 | if (!S.TemplateParameterListsAreEqual(NewTTP->getTemplateParameters(), |
7731 | OldTTP->getTemplateParameters(), |
7732 | Complain, |
7733 | (Kind == Sema::TPL_TemplateMatch |
7734 | ? Sema::TPL_TemplateTemplateParmMatch |
7735 | : Kind), |
7736 | TemplateArgLoc)) |
7737 | return false; |
7738 | } else if (Kind != Sema::TPL_TemplateTemplateArgumentMatch) { |
7739 | const Expr *NewC = nullptr, *OldC = nullptr; |
7740 | if (const auto *TC = cast<TemplateTypeParmDecl>(New)->getTypeConstraint()) |
7741 | NewC = TC->getImmediatelyDeclaredConstraint(); |
7742 | if (const auto *TC = cast<TemplateTypeParmDecl>(Old)->getTypeConstraint()) |
7743 | OldC = TC->getImmediatelyDeclaredConstraint(); |
7744 | |
7745 | auto Diagnose = [&] { |
7746 | S.Diag(NewC ? NewC->getBeginLoc() : New->getBeginLoc(), |
7747 | diag::err_template_different_type_constraint); |
7748 | S.Diag(OldC ? OldC->getBeginLoc() : Old->getBeginLoc(), |
7749 | diag::note_template_prev_declaration) << /*declaration*/0; |
7750 | }; |
7751 | |
7752 | if (!NewC != !OldC) { |
7753 | if (Complain) |
7754 | Diagnose(); |
7755 | return false; |
7756 | } |
7757 | |
7758 | if (NewC) { |
7759 | llvm::FoldingSetNodeID OldCID, NewCID; |
7760 | OldC->Profile(OldCID, S.Context, /*Canonical=*/true); |
7761 | NewC->Profile(NewCID, S.Context, /*Canonical=*/true); |
7762 | if (OldCID != NewCID) { |
7763 | if (Complain) |
7764 | Diagnose(); |
7765 | return false; |
7766 | } |
7767 | } |
7768 | } |
7769 | |
7770 | return true; |
7771 | } |
7772 | |
7773 | /// Diagnose a known arity mismatch when comparing template argument |
7774 | /// lists. |
7775 | static |
7776 | void DiagnoseTemplateParameterListArityMismatch(Sema &S, |
7777 | TemplateParameterList *New, |
7778 | TemplateParameterList *Old, |
7779 | Sema::TemplateParameterListEqualKind Kind, |
7780 | SourceLocation TemplateArgLoc) { |
7781 | unsigned NextDiag = diag::err_template_param_list_different_arity; |
7782 | if (TemplateArgLoc.isValid()) { |
7783 | S.Diag(TemplateArgLoc, diag::err_template_arg_template_params_mismatch); |
7784 | NextDiag = diag::note_template_param_list_different_arity; |
7785 | } |
7786 | S.Diag(New->getTemplateLoc(), NextDiag) |
7787 | << (New->size() > Old->size()) |
7788 | << (Kind != Sema::TPL_TemplateMatch) |
7789 | << SourceRange(New->getTemplateLoc(), New->getRAngleLoc()); |
7790 | S.Diag(Old->getTemplateLoc(), diag::note_template_prev_declaration) |
7791 | << (Kind != Sema::TPL_TemplateMatch) |
7792 | << SourceRange(Old->getTemplateLoc(), Old->getRAngleLoc()); |
7793 | } |
7794 | |
7795 | /// Determine whether the given template parameter lists are |
7796 | /// equivalent. |
7797 | /// |
7798 | /// \param New The new template parameter list, typically written in the |
7799 | /// source code as part of a new template declaration. |
7800 | /// |
7801 | /// \param Old The old template parameter list, typically found via |
7802 | /// name lookup of the template declared with this template parameter |
7803 | /// list. |
7804 | /// |
7805 | /// \param Complain If true, this routine will produce a diagnostic if |
7806 | /// the template parameter lists are not equivalent. |
7807 | /// |
7808 | /// \param Kind describes how we are to match the template parameter lists. |
7809 | /// |
7810 | /// \param TemplateArgLoc If this source location is valid, then we |
7811 | /// are actually checking the template parameter list of a template |
7812 | /// argument (New) against the template parameter list of its |
7813 | /// corresponding template template parameter (Old). We produce |
7814 | /// slightly different diagnostics in this scenario. |
7815 | /// |
7816 | /// \returns True if the template parameter lists are equal, false |
7817 | /// otherwise. |
7818 | bool |
7819 | Sema::TemplateParameterListsAreEqual(TemplateParameterList *New, |
7820 | TemplateParameterList *Old, |
7821 | bool Complain, |
7822 | TemplateParameterListEqualKind Kind, |
7823 | SourceLocation TemplateArgLoc) { |
7824 | if (Old->size() != New->size() && Kind != TPL_TemplateTemplateArgumentMatch) { |
7825 | if (Complain) |
7826 | DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind, |
7827 | TemplateArgLoc); |
7828 | |
7829 | return false; |
7830 | } |
7831 | |
7832 | // C++0x [temp.arg.template]p3: |
7833 | // A template-argument matches a template template-parameter (call it P) |
7834 | // when each of the template parameters in the template-parameter-list of |
7835 | // the template-argument's corresponding class template or alias template |
7836 | // (call it A) matches the corresponding template parameter in the |
7837 | // template-parameter-list of P. [...] |
7838 | TemplateParameterList::iterator NewParm = New->begin(); |
7839 | TemplateParameterList::iterator NewParmEnd = New->end(); |
7840 | for (TemplateParameterList::iterator OldParm = Old->begin(), |
7841 | OldParmEnd = Old->end(); |
7842 | OldParm != OldParmEnd; ++OldParm) { |
7843 | if (Kind != TPL_TemplateTemplateArgumentMatch || |
7844 | !(*OldParm)->isTemplateParameterPack()) { |
7845 | if (NewParm == NewParmEnd) { |
7846 | if (Complain) |
7847 | DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind, |
7848 | TemplateArgLoc); |
7849 | |
7850 | return false; |
7851 | } |
7852 | |
7853 | if (!MatchTemplateParameterKind(*this, *NewParm, *OldParm, Complain, |
7854 | Kind, TemplateArgLoc)) |
7855 | return false; |
7856 | |
7857 | ++NewParm; |
7858 | continue; |
7859 | } |
7860 | |
7861 | // C++0x [temp.arg.template]p3: |
7862 | // [...] When P's template- parameter-list contains a template parameter |
7863 | // pack (14.5.3), the template parameter pack will match zero or more |
7864 | // template parameters or template parameter packs in the |
7865 | // template-parameter-list of A with the same type and form as the |
7866 | // template parameter pack in P (ignoring whether those template |
7867 | // parameters are template parameter packs). |
7868 | for (; NewParm != NewParmEnd; ++NewParm) { |
7869 | if (!MatchTemplateParameterKind(*this, *NewParm, *OldParm, Complain, |
7870 | Kind, TemplateArgLoc)) |
7871 | return false; |
7872 | } |
7873 | } |
7874 | |
7875 | // Make sure we exhausted all of the arguments. |
7876 | if (NewParm != NewParmEnd) { |
7877 | if (Complain) |
7878 | DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind, |
7879 | TemplateArgLoc); |
7880 | |
7881 | return false; |
7882 | } |
7883 | |
7884 | if (Kind != TPL_TemplateTemplateArgumentMatch) { |
7885 | const Expr *NewRC = New->getRequiresClause(); |
7886 | const Expr *OldRC = Old->getRequiresClause(); |
7887 | |
7888 | auto Diagnose = [&] { |
7889 | Diag(NewRC ? NewRC->getBeginLoc() : New->getTemplateLoc(), |
7890 | diag::err_template_different_requires_clause); |
7891 | Diag(OldRC ? OldRC->getBeginLoc() : Old->getTemplateLoc(), |
7892 | diag::note_template_prev_declaration) << /*declaration*/0; |
7893 | }; |
7894 | |
7895 | if (!NewRC != !OldRC) { |
7896 | if (Complain) |
7897 | Diagnose(); |
7898 | return false; |
7899 | } |
7900 | |
7901 | if (NewRC) { |
7902 | llvm::FoldingSetNodeID OldRCID, NewRCID; |
7903 | OldRC->Profile(OldRCID, Context, /*Canonical=*/true); |
7904 | NewRC->Profile(NewRCID, Context, /*Canonical=*/true); |
7905 | if (OldRCID != NewRCID) { |
7906 | if (Complain) |
7907 | Diagnose(); |
7908 | return false; |
7909 | } |
7910 | } |
7911 | } |
7912 | |
7913 | return true; |
7914 | } |
7915 | |
7916 | /// Check whether a template can be declared within this scope. |
7917 | /// |
7918 | /// If the template declaration is valid in this scope, returns |
7919 | /// false. Otherwise, issues a diagnostic and returns true. |
7920 | bool |
7921 | Sema::CheckTemplateDeclScope(Scope *S, TemplateParameterList *TemplateParams) { |
7922 | if (!S) |
7923 | return false; |
7924 | |
7925 | // Find the nearest enclosing declaration scope. |
7926 | while ((S->getFlags() & Scope::DeclScope) == 0 || |
7927 | (S->getFlags() & Scope::TemplateParamScope) != 0) |
7928 | S = S->getParent(); |
7929 | |
7930 | // C++ [temp.pre]p6: [P2096] |
7931 | // A template, explicit specialization, or partial specialization shall not |
7932 | // have C linkage. |
7933 | DeclContext *Ctx = S->getEntity(); |
7934 | if (Ctx && Ctx->isExternCContext()) { |
7935 | Diag(TemplateParams->getTemplateLoc(), diag::err_template_linkage) |
7936 | << TemplateParams->getSourceRange(); |
7937 | if (const LinkageSpecDecl *LSD = Ctx->getExternCContext()) |
7938 | Diag(LSD->getExternLoc(), diag::note_extern_c_begins_here); |
7939 | return true; |
7940 | } |
7941 | Ctx = Ctx ? Ctx->getRedeclContext() : nullptr; |
7942 | |
7943 | // C++ [temp]p2: |
7944 | // A template-declaration can appear only as a namespace scope or |
7945 | // class scope declaration. |
7946 | // C++ [temp.expl.spec]p3: |
7947 | // An explicit specialization may be declared in any scope in which the |
7948 | // corresponding primary template may be defined. |
7949 | // C++ [temp.class.spec]p6: [P2096] |
7950 | // A partial specialization may be declared in any scope in which the |
7951 | // corresponding primary template may be defined. |
7952 | if (Ctx) { |
7953 | if (Ctx->isFileContext()) |
7954 | return false; |
7955 | if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Ctx)) { |
7956 | // C++ [temp.mem]p2: |
7957 | // A local class shall not have member templates. |
7958 | if (RD->isLocalClass()) |
7959 | return Diag(TemplateParams->getTemplateLoc(), |
7960 | diag::err_template_inside_local_class) |
7961 | << TemplateParams->getSourceRange(); |
7962 | else |
7963 | return false; |
7964 | } |
7965 | } |
7966 | |
7967 | return Diag(TemplateParams->getTemplateLoc(), |
7968 | diag::err_template_outside_namespace_or_class_scope) |
7969 | << TemplateParams->getSourceRange(); |
7970 | } |
7971 | |
7972 | /// Determine what kind of template specialization the given declaration |
7973 | /// is. |
7974 | static TemplateSpecializationKind getTemplateSpecializationKind(Decl *D) { |
7975 | if (!D) |
7976 | return TSK_Undeclared; |
7977 | |
7978 | if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) |
7979 | return Record->getTemplateSpecializationKind(); |
7980 | if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) |
7981 | return Function->getTemplateSpecializationKind(); |
7982 | if (VarDecl *Var = dyn_cast<VarDecl>(D)) |
7983 | return Var->getTemplateSpecializationKind(); |
7984 | |
7985 | return TSK_Undeclared; |
7986 | } |
7987 | |
7988 | /// Check whether a specialization is well-formed in the current |
7989 | /// context. |
7990 | /// |
7991 | /// This routine determines whether a template specialization can be declared |
7992 | /// in the current context (C++ [temp.expl.spec]p2). |
7993 | /// |
7994 | /// \param S the semantic analysis object for which this check is being |
7995 | /// performed. |
7996 | /// |
7997 | /// \param Specialized the entity being specialized or instantiated, which |
7998 | /// may be a kind of template (class template, function template, etc.) or |
7999 | /// a member of a class template (member function, static data member, |
8000 | /// member class). |
8001 | /// |
8002 | /// \param PrevDecl the previous declaration of this entity, if any. |
8003 | /// |
8004 | /// \param Loc the location of the explicit specialization or instantiation of |
8005 | /// this entity. |
8006 | /// |
8007 | /// \param IsPartialSpecialization whether this is a partial specialization of |
8008 | /// a class template. |
8009 | /// |
8010 | /// \returns true if there was an error that we cannot recover from, false |
8011 | /// otherwise. |
8012 | static bool CheckTemplateSpecializationScope(Sema &S, |
8013 | NamedDecl *Specialized, |
8014 | NamedDecl *PrevDecl, |
8015 | SourceLocation Loc, |
8016 | bool IsPartialSpecialization) { |
8017 | // Keep these "kind" numbers in sync with the %select statements in the |
8018 | // various diagnostics emitted by this routine. |
8019 | int EntityKind = 0; |
8020 | if (isa<ClassTemplateDecl>(Specialized)) |
8021 | EntityKind = IsPartialSpecialization? 1 : 0; |
8022 | else if (isa<VarTemplateDecl>(Specialized)) |
8023 | EntityKind = IsPartialSpecialization ? 3 : 2; |
8024 | else if (isa<FunctionTemplateDecl>(Specialized)) |
8025 | EntityKind = 4; |
8026 | else if (isa<CXXMethodDecl>(Specialized)) |
8027 | EntityKind = 5; |
8028 | else if (isa<VarDecl>(Specialized)) |
8029 | EntityKind = 6; |
8030 | else if (isa<RecordDecl>(Specialized)) |
8031 | EntityKind = 7; |
8032 | else if (isa<EnumDecl>(Specialized) && S.getLangOpts().CPlusPlus11) |
8033 | EntityKind = 8; |
8034 | else { |
8035 | S.Diag(Loc, diag::err_template_spec_unknown_kind) |
8036 | << S.getLangOpts().CPlusPlus11; |
8037 | S.Diag(Specialized->getLocation(), diag::note_specialized_entity); |
8038 | return true; |
8039 | } |
8040 | |
8041 | // C++ [temp.expl.spec]p2: |
8042 | // An explicit specialization may be declared in any scope in which |
8043 | // the corresponding primary template may be defined. |
8044 | if (S.CurContext->getRedeclContext()->isFunctionOrMethod()) { |
8045 | S.Diag(Loc, diag::err_template_spec_decl_function_scope) |
8046 | << Specialized; |
8047 | return true; |
8048 | } |
8049 | |
8050 | // C++ [temp.class.spec]p6: |
8051 | // A class template partial specialization may be declared in any |
8052 | // scope in which the primary template may be defined. |
8053 | DeclContext *SpecializedContext = |
8054 | Specialized->getDeclContext()->getRedeclContext(); |
8055 | DeclContext *DC = S.CurContext->getRedeclContext(); |
8056 | |
8057 | // Make sure that this redeclaration (or definition) occurs in the same |
8058 | // scope or an enclosing namespace. |
8059 | if (!(DC->isFileContext() ? DC->Encloses(SpecializedContext) |
8060 | : DC->Equals(SpecializedContext))) { |
8061 | if (isa<TranslationUnitDecl>(SpecializedContext)) |
8062 | S.Diag(Loc, diag::err_template_spec_redecl_global_scope) |
8063 | << EntityKind << Specialized; |
8064 | else { |
8065 | auto *ND = cast<NamedDecl>(SpecializedContext); |
8066 | int Diag = diag::err_template_spec_redecl_out_of_scope; |
8067 | if (S.getLangOpts().MicrosoftExt && !DC->isRecord()) |
8068 | Diag = diag::ext_ms_template_spec_redecl_out_of_scope; |
8069 | S.Diag(Loc, Diag) << EntityKind << Specialized |
8070 | << ND << isa<CXXRecordDecl>(ND); |
8071 | } |
8072 | |
8073 | S.Diag(Specialized->getLocation(), diag::note_specialized_entity); |
8074 | |
8075 | // Don't allow specializing in the wrong class during error recovery. |
8076 | // Otherwise, things can go horribly wrong. |
8077 | if (DC->isRecord()) |
8078 | return true; |
8079 | } |
8080 | |
8081 | return false; |
8082 | } |
8083 | |
8084 | static SourceRange findTemplateParameterInType(unsigned Depth, Expr *E) { |
8085 | if (!E->isTypeDependent()) |
8086 | return SourceLocation(); |
8087 | DependencyChecker Checker(Depth, /*IgnoreNonTypeDependent*/true); |
8088 | Checker.TraverseStmt(E); |
8089 | if (Checker.MatchLoc.isInvalid()) |
8090 | return E->getSourceRange(); |
8091 | return Checker.MatchLoc; |
8092 | } |
8093 | |
8094 | static SourceRange findTemplateParameter(unsigned Depth, TypeLoc TL) { |
8095 | if (!TL.getType()->isDependentType()) |
8096 | return SourceLocation(); |
8097 | DependencyChecker Checker(Depth, /*IgnoreNonTypeDependent*/true); |
8098 | Checker.TraverseTypeLoc(TL); |
8099 | if (Checker.MatchLoc.isInvalid()) |
8100 | return TL.getSourceRange(); |
8101 | return Checker.MatchLoc; |
8102 | } |
8103 | |
8104 | /// Subroutine of Sema::CheckTemplatePartialSpecializationArgs |
8105 | /// that checks non-type template partial specialization arguments. |
8106 | static bool CheckNonTypeTemplatePartialSpecializationArgs( |
8107 | Sema &S, SourceLocation TemplateNameLoc, NonTypeTemplateParmDecl *Param, |
8108 | const TemplateArgument *Args, unsigned NumArgs, bool IsDefaultArgument) { |
8109 | for (unsigned I = 0; I != NumArgs; ++I) { |
8110 | if (Args[I].getKind() == TemplateArgument::Pack) { |
8111 | if (CheckNonTypeTemplatePartialSpecializationArgs( |
8112 | S, TemplateNameLoc, Param, Args[I].pack_begin(), |
8113 | Args[I].pack_size(), IsDefaultArgument)) |
8114 | return true; |
8115 | |
8116 | continue; |
8117 | } |
8118 | |
8119 | if (Args[I].getKind() != TemplateArgument::Expression) |
8120 | continue; |
8121 | |
8122 | Expr *ArgExpr = Args[I].getAsExpr(); |
8123 | |
8124 | // We can have a pack expansion of any of the bullets below. |
8125 | if (PackExpansionExpr *Expansion = dyn_cast<PackExpansionExpr>(ArgExpr)) |
8126 | ArgExpr = Expansion->getPattern(); |
8127 | |
8128 | // Strip off any implicit casts we added as part of type checking. |
8129 | while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgExpr)) |
8130 | ArgExpr = ICE->getSubExpr(); |
8131 | |
8132 | // C++ [temp.class.spec]p8: |
8133 | // A non-type argument is non-specialized if it is the name of a |
8134 | // non-type parameter. All other non-type arguments are |
8135 | // specialized. |
8136 | // |
8137 | // Below, we check the two conditions that only apply to |
8138 | // specialized non-type arguments, so skip any non-specialized |
8139 | // arguments. |
8140 | if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ArgExpr)) |
8141 | if (isa<NonTypeTemplateParmDecl>(DRE->getDecl())) |
8142 | continue; |
8143 | |
8144 | // C++ [temp.class.spec]p9: |
8145 | // Within the argument list of a class template partial |
8146 | // specialization, the following restrictions apply: |
8147 | // -- A partially specialized non-type argument expression |
8148 | // shall not involve a template parameter of the partial |
8149 | // specialization except when the argument expression is a |
8150 | // simple identifier. |
8151 | // -- The type of a template parameter corresponding to a |
8152 | // specialized non-type argument shall not be dependent on a |
8153 | // parameter of the specialization. |
8154 | // DR1315 removes the first bullet, leaving an incoherent set of rules. |
8155 | // We implement a compromise between the original rules and DR1315: |
8156 | // -- A specialized non-type template argument shall not be |
8157 | // type-dependent and the corresponding template parameter |
8158 | // shall have a non-dependent type. |
8159 | SourceRange ParamUseRange = |
8160 | findTemplateParameterInType(Param->getDepth(), ArgExpr); |
8161 | if (ParamUseRange.isValid()) { |
8162 | if (IsDefaultArgument) { |
8163 | S.Diag(TemplateNameLoc, |
8164 | diag::err_dependent_non_type_arg_in_partial_spec); |
8165 | S.Diag(ParamUseRange.getBegin(), |
8166 | diag::note_dependent_non_type_default_arg_in_partial_spec) |
8167 | << ParamUseRange; |
8168 | } else { |
8169 | S.Diag(ParamUseRange.getBegin(), |
8170 | diag::err_dependent_non_type_arg_in_partial_spec) |
8171 | << ParamUseRange; |
8172 | } |
8173 | return true; |
8174 | } |
8175 | |
8176 | ParamUseRange = findTemplateParameter( |
8177 | Param->getDepth(), Param->getTypeSourceInfo()->getTypeLoc()); |
8178 | if (ParamUseRange.isValid()) { |
8179 | S.Diag(IsDefaultArgument ? TemplateNameLoc : ArgExpr->getBeginLoc(), |
8180 | diag::err_dependent_typed_non_type_arg_in_partial_spec) |
8181 | << Param->getType(); |
8182 | S.Diag(Param->getLocation(), diag::note_template_param_here) |
8183 | << (IsDefaultArgument ? ParamUseRange : SourceRange()) |
8184 | << ParamUseRange; |
8185 | return true; |
8186 | } |
8187 | } |
8188 | |
8189 | return false; |
8190 | } |
8191 | |
8192 | /// Check the non-type template arguments of a class template |
8193 | /// partial specialization according to C++ [temp.class.spec]p9. |
8194 | /// |
8195 | /// \param TemplateNameLoc the location of the template name. |
8196 | /// \param PrimaryTemplate the template parameters of the primary class |
8197 | /// template. |
8198 | /// \param NumExplicit the number of explicitly-specified template arguments. |
8199 | /// \param TemplateArgs the template arguments of the class template |
8200 | /// partial specialization. |
8201 | /// |
8202 | /// \returns \c true if there was an error, \c false otherwise. |
8203 | bool Sema::CheckTemplatePartialSpecializationArgs( |
8204 | SourceLocation TemplateNameLoc, TemplateDecl *PrimaryTemplate, |
8205 | unsigned NumExplicit, ArrayRef<TemplateArgument> TemplateArgs) { |
8206 | // We have to be conservative when checking a template in a dependent |
8207 | // context. |
8208 | if (PrimaryTemplate->getDeclContext()->isDependentContext()) |
8209 | return false; |
8210 | |
8211 | TemplateParameterList *TemplateParams = |
8212 | PrimaryTemplate->getTemplateParameters(); |
8213 | for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) { |
8214 | NonTypeTemplateParmDecl *Param |
8215 | = dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(I)); |
8216 | if (!Param) |
8217 | continue; |
8218 | |
8219 | if (CheckNonTypeTemplatePartialSpecializationArgs(*this, TemplateNameLoc, |
8220 | Param, &TemplateArgs[I], |
8221 | 1, I >= NumExplicit)) |
8222 | return true; |
8223 | } |
8224 | |
8225 | return false; |
8226 | } |
8227 | |
8228 | DeclResult Sema::ActOnClassTemplateSpecialization( |
8229 | Scope *S, unsigned TagSpec, TagUseKind TUK, SourceLocation KWLoc, |
8230 | SourceLocation ModulePrivateLoc, CXXScopeSpec &SS, |
8231 | TemplateIdAnnotation &TemplateId, const ParsedAttributesView &Attr, |
8232 | MultiTemplateParamsArg TemplateParameterLists, SkipBodyInfo *SkipBody) { |
8233 | assert(TUK != TUK_Reference && "References are not specializations")((void)0); |
8234 | |
8235 | // NOTE: KWLoc is the location of the tag keyword. This will instead |
8236 | // store the location of the outermost template keyword in the declaration. |
8237 | SourceLocation TemplateKWLoc = TemplateParameterLists.size() > 0 |
8238 | ? TemplateParameterLists[0]->getTemplateLoc() : KWLoc; |
8239 | SourceLocation TemplateNameLoc = TemplateId.TemplateNameLoc; |
8240 | SourceLocation LAngleLoc = TemplateId.LAngleLoc; |
8241 | SourceLocation RAngleLoc = TemplateId.RAngleLoc; |
8242 | |
8243 | // Find the class template we're specializing |
8244 | TemplateName Name = TemplateId.Template.get(); |
8245 | ClassTemplateDecl *ClassTemplate |
8246 | = dyn_cast_or_null<ClassTemplateDecl>(Name.getAsTemplateDecl()); |
8247 | |
8248 | if (!ClassTemplate) { |
8249 | Diag(TemplateNameLoc, diag::err_not_class_template_specialization) |
8250 | << (Name.getAsTemplateDecl() && |
8251 | isa<TemplateTemplateParmDecl>(Name.getAsTemplateDecl())); |
8252 | return true; |
8253 | } |
8254 | |
8255 | bool isMemberSpecialization = false; |
8256 | bool isPartialSpecialization = false; |
8257 | |
8258 | // Check the validity of the template headers that introduce this |
8259 | // template. |
8260 | // FIXME: We probably shouldn't complain about these headers for |
8261 | // friend declarations. |
8262 | bool Invalid = false; |
8263 | TemplateParameterList *TemplateParams = |
8264 | MatchTemplateParametersToScopeSpecifier( |
8265 | KWLoc, TemplateNameLoc, SS, &TemplateId, |
8266 | TemplateParameterLists, TUK == TUK_Friend, isMemberSpecialization, |
8267 | Invalid); |
8268 | if (Invalid) |
8269 | return true; |
8270 | |
8271 | // Check that we can declare a template specialization here. |
8272 | if (TemplateParams && CheckTemplateDeclScope(S, TemplateParams)) |
8273 | return true; |
8274 | |
8275 | if (TemplateParams && TemplateParams->size() > 0) { |
8276 | isPartialSpecialization = true; |
8277 | |
8278 | if (TUK == TUK_Friend) { |
8279 | Diag(KWLoc, diag::err_partial_specialization_friend) |
8280 | << SourceRange(LAngleLoc, RAngleLoc); |
8281 | return true; |
8282 | } |
8283 | |
8284 | // C++ [temp.class.spec]p10: |
8285 | // The template parameter list of a specialization shall not |
8286 | // contain default template argument values. |
8287 | for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) { |
8288 | Decl *Param = TemplateParams->getParam(I); |
8289 | if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param)) { |
8290 | if (TTP->hasDefaultArgument()) { |
8291 | Diag(TTP->getDefaultArgumentLoc(), |
8292 | diag::err_default_arg_in_partial_spec); |
8293 | TTP->removeDefaultArgument(); |
8294 | } |
8295 | } else if (NonTypeTemplateParmDecl *NTTP |
8296 | = dyn_cast<NonTypeTemplateParmDecl>(Param)) { |
8297 | if (Expr *DefArg = NTTP->getDefaultArgument()) { |
8298 | Diag(NTTP->getDefaultArgumentLoc(), |
8299 | diag::err_default_arg_in_partial_spec) |
8300 | << DefArg->getSourceRange(); |
8301 | NTTP->removeDefaultArgument(); |
8302 | } |
8303 | } else { |
8304 | TemplateTemplateParmDecl *TTP = cast<TemplateTemplateParmDecl>(Param); |
8305 | if (TTP->hasDefaultArgument()) { |
8306 | Diag(TTP->getDefaultArgument().getLocation(), |
8307 | diag::err_default_arg_in_partial_spec) |
8308 | << TTP->getDefaultArgument().getSourceRange(); |
8309 | TTP->removeDefaultArgument(); |
8310 | } |
8311 | } |
8312 | } |
8313 | } else if (TemplateParams) { |
8314 | if (TUK == TUK_Friend) |
8315 | Diag(KWLoc, diag::err_template_spec_friend) |
8316 | << FixItHint::CreateRemoval( |
8317 | SourceRange(TemplateParams->getTemplateLoc(), |
8318 | TemplateParams->getRAngleLoc())) |
8319 | << SourceRange(LAngleLoc, RAngleLoc); |
8320 | } else { |
8321 | assert(TUK == TUK_Friend && "should have a 'template<>' for this decl")((void)0); |
8322 | } |
8323 | |
8324 | // Check that the specialization uses the same tag kind as the |
8325 | // original template. |
8326 | TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); |
8327 | assert(Kind != TTK_Enum && "Invalid enum tag in class template spec!")((void)0); |
8328 | if (!isAcceptableTagRedeclaration(ClassTemplate->getTemplatedDecl(), |
8329 | Kind, TUK == TUK_Definition, KWLoc, |
8330 | ClassTemplate->getIdentifier())) { |
8331 | Diag(KWLoc, diag::err_use_with_wrong_tag) |
8332 | << ClassTemplate |
8333 | << FixItHint::CreateReplacement(KWLoc, |
8334 | ClassTemplate->getTemplatedDecl()->getKindName()); |
8335 | Diag(ClassTemplate->getTemplatedDecl()->getLocation(), |
8336 | diag::note_previous_use); |
8337 | Kind = ClassTemplate->getTemplatedDecl()->getTagKind(); |
8338 | } |
8339 | |
8340 | // Translate the parser's template argument list in our AST format. |
8341 | TemplateArgumentListInfo TemplateArgs = |
8342 | makeTemplateArgumentListInfo(*this, TemplateId); |
8343 | |
8344 | // Check for unexpanded parameter packs in any of the template arguments. |
8345 | for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) |
8346 | if (DiagnoseUnexpandedParameterPack(TemplateArgs[I], |
8347 | UPPC_PartialSpecialization)) |
8348 | return true; |
8349 | |
8350 | // Check that the template argument list is well-formed for this |
8351 | // template. |
8352 | SmallVector<TemplateArgument, 4> Converted; |
8353 | if (CheckTemplateArgumentList(ClassTemplate, TemplateNameLoc, |
8354 | TemplateArgs, false, Converted, |
8355 | /*UpdateArgsWithConversion=*/true)) |
8356 | return true; |
8357 | |
8358 | // Find the class template (partial) specialization declaration that |
8359 | // corresponds to these arguments. |
8360 | if (isPartialSpecialization) { |
8361 | if (CheckTemplatePartialSpecializationArgs(TemplateNameLoc, ClassTemplate, |
8362 | TemplateArgs.size(), Converted)) |
8363 | return true; |
8364 | |
8365 | // FIXME: Move this to CheckTemplatePartialSpecializationArgs so we |
8366 | // also do it during instantiation. |
8367 | if (!Name.isDependent() && |
8368 | !TemplateSpecializationType::anyDependentTemplateArguments(TemplateArgs, |
8369 | Converted)) { |
8370 | Diag(TemplateNameLoc, diag::err_partial_spec_fully_specialized) |
8371 | << ClassTemplate->getDeclName(); |
8372 | isPartialSpecialization = false; |
8373 | } |
8374 | } |
8375 | |
8376 | void *InsertPos = nullptr; |
8377 | ClassTemplateSpecializationDecl *PrevDecl = nullptr; |
8378 | |
8379 | if (isPartialSpecialization) |
8380 | PrevDecl = ClassTemplate->findPartialSpecialization(Converted, |
8381 | TemplateParams, |
8382 | InsertPos); |
8383 | else |
8384 | PrevDecl = ClassTemplate->findSpecialization(Converted, InsertPos); |
8385 | |
8386 | ClassTemplateSpecializationDecl *Specialization = nullptr; |
8387 | |
8388 | // Check whether we can declare a class template specialization in |
8389 | // the current scope. |
8390 | if (TUK != TUK_Friend && |
8391 | CheckTemplateSpecializationScope(*this, ClassTemplate, PrevDecl, |
8392 | TemplateNameLoc, |
8393 | isPartialSpecialization)) |
8394 | return true; |
8395 | |
8396 | // The canonical type |
8397 | QualType CanonType; |
8398 | if (isPartialSpecialization) { |
8399 | // Build the canonical type that describes the converted template |
8400 | // arguments of the class template partial specialization. |
8401 | TemplateName CanonTemplate = Context.getCanonicalTemplateName(Name); |
8402 | CanonType = Context.getTemplateSpecializationType(CanonTemplate, |
8403 | Converted); |
8404 | |
8405 | if (Context.hasSameType(CanonType, |
8406 | ClassTemplate->getInjectedClassNameSpecialization()) && |
8407 | (!Context.getLangOpts().CPlusPlus20 || |
8408 | !TemplateParams->hasAssociatedConstraints())) { |
8409 | // C++ [temp.class.spec]p9b3: |
8410 | // |
8411 | // -- The argument list of the specialization shall not be identical |
8412 | // to the implicit argument list of the primary template. |
8413 | // |
8414 | // This rule has since been removed, because it's redundant given DR1495, |
8415 | // but we keep it because it produces better diagnostics and recovery. |
8416 | Diag(TemplateNameLoc, diag::err_partial_spec_args_match_primary_template) |
8417 | << /*class template*/0 << (TUK == TUK_Definition) |
8418 | << FixItHint::CreateRemoval(SourceRange(LAngleLoc, RAngleLoc)); |
8419 | return CheckClassTemplate(S, TagSpec, TUK, KWLoc, SS, |
8420 | ClassTemplate->getIdentifier(), |
8421 | TemplateNameLoc, |
8422 | Attr, |
8423 | TemplateParams, |
8424 | AS_none, /*ModulePrivateLoc=*/SourceLocation(), |
8425 | /*FriendLoc*/SourceLocation(), |
8426 | TemplateParameterLists.size() - 1, |
8427 | TemplateParameterLists.data()); |
8428 | } |
8429 | |
8430 | // Create a new class template partial specialization declaration node. |
8431 | ClassTemplatePartialSpecializationDecl *PrevPartial |
8432 | = cast_or_null<ClassTemplatePartialSpecializationDecl>(PrevDecl); |
8433 | ClassTemplatePartialSpecializationDecl *Partial |
8434 | = ClassTemplatePartialSpecializationDecl::Create(Context, Kind, |
8435 | ClassTemplate->getDeclContext(), |
8436 | KWLoc, TemplateNameLoc, |
8437 | TemplateParams, |
8438 | ClassTemplate, |
8439 | Converted, |
8440 | TemplateArgs, |
8441 | CanonType, |
8442 | PrevPartial); |
8443 | SetNestedNameSpecifier(*this, Partial, SS); |
8444 | if (TemplateParameterLists.size() > 1 && SS.isSet()) { |
8445 | Partial->setTemplateParameterListsInfo( |
8446 | Context, TemplateParameterLists.drop_back(1)); |
8447 | } |
8448 | |
8449 | if (!PrevPartial) |
8450 | ClassTemplate->AddPartialSpecialization(Partial, InsertPos); |
8451 | Specialization = Partial; |
8452 | |
8453 | // If we are providing an explicit specialization of a member class |
8454 | // template specialization, make a note of that. |
8455 | if (PrevPartial && PrevPartial->getInstantiatedFromMember()) |
8456 | PrevPartial->setMemberSpecialization(); |
8457 | |
8458 | CheckTemplatePartialSpecialization(Partial); |
8459 | } else { |
8460 | // Create a new class template specialization declaration node for |
8461 | // this explicit specialization or friend declaration. |
8462 | Specialization |
8463 | = ClassTemplateSpecializationDecl::Create(Context, Kind, |
8464 | ClassTemplate->getDeclContext(), |
8465 | KWLoc, TemplateNameLoc, |
8466 | ClassTemplate, |
8467 | Converted, |
8468 | PrevDecl); |
8469 | SetNestedNameSpecifier(*this, Specialization, SS); |
8470 | if (TemplateParameterLists.size() > 0) { |
8471 | Specialization->setTemplateParameterListsInfo(Context, |
8472 | TemplateParameterLists); |
8473 | } |
8474 | |
8475 | if (!PrevDecl) |
8476 | ClassTemplate->AddSpecialization(Specialization, InsertPos); |
8477 | |
8478 | if (CurContext->isDependentContext()) { |
8479 | TemplateName CanonTemplate = Context.getCanonicalTemplateName(Name); |
8480 | CanonType = Context.getTemplateSpecializationType( |
8481 | CanonTemplate, Converted); |
8482 | } else { |
8483 | CanonType = Context.getTypeDeclType(Specialization); |
8484 | } |
8485 | } |
8486 | |
8487 | // C++ [temp.expl.spec]p6: |
8488 | // If a template, a member template or the member of a class template is |
8489 | // explicitly specialized then that specialization shall be declared |
8490 | // before the first use of that specialization that would cause an implicit |
8491 | // instantiation to take place, in every translation unit in which such a |
8492 | // use occurs; no diagnostic is required. |
8493 | if (PrevDecl && PrevDecl->getPointOfInstantiation().isValid()) { |
8494 | bool Okay = false; |
8495 | for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) { |
8496 | // Is there any previous explicit specialization declaration? |
8497 | if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) { |
8498 | Okay = true; |
8499 | break; |
8500 | } |
8501 | } |
8502 | |
8503 | if (!Okay) { |
8504 | SourceRange Range(TemplateNameLoc, RAngleLoc); |
8505 | Diag(TemplateNameLoc, diag::err_specialization_after_instantiation) |
8506 | << Context.getTypeDeclType(Specialization) << Range; |
8507 | |
8508 | Diag(PrevDecl->getPointOfInstantiation(), |
8509 | diag::note_instantiation_required_here) |
8510 | << (PrevDecl->getTemplateSpecializationKind() |
8511 | != TSK_ImplicitInstantiation); |
8512 | return true; |
8513 | } |
8514 | } |
8515 | |
8516 | // If this is not a friend, note that this is an explicit specialization. |
8517 | if (TUK != TUK_Friend) |
8518 | Specialization->setSpecializationKind(TSK_ExplicitSpecialization); |
8519 | |
8520 | // Check that this isn't a redefinition of this specialization. |
8521 | if (TUK == TUK_Definition) { |
8522 | RecordDecl *Def = Specialization->getDefinition(); |
8523 | NamedDecl *Hidden = nullptr; |
8524 | if (Def && SkipBody && !hasVisibleDefinition(Def, &Hidden)) { |
8525 | SkipBody->ShouldSkip = true; |
8526 | SkipBody->Previous = Def; |
8527 | makeMergedDefinitionVisible(Hidden); |
8528 | } else if (Def) { |
8529 | SourceRange Range(TemplateNameLoc, RAngleLoc); |
8530 | Diag(TemplateNameLoc, diag::err_redefinition) << Specialization << Range; |
8531 | Diag(Def->getLocation(), diag::note_previous_definition); |
8532 | Specialization->setInvalidDecl(); |
8533 | return true; |
8534 | } |
8535 | } |
8536 | |
8537 | ProcessDeclAttributeList(S, Specialization, Attr); |
8538 | |
8539 | // Add alignment attributes if necessary; these attributes are checked when |
8540 | // the ASTContext lays out the structure. |
8541 | if (TUK == TUK_Definition && (!SkipBody || !SkipBody->ShouldSkip)) { |
8542 | AddAlignmentAttributesForRecord(Specialization); |
8543 | AddMsStructLayoutForRecord(Specialization); |
8544 | } |
8545 | |
8546 | if (ModulePrivateLoc.isValid()) |
8547 | Diag(Specialization->getLocation(), diag::err_module_private_specialization) |
8548 | << (isPartialSpecialization? 1 : 0) |
8549 | << FixItHint::CreateRemoval(ModulePrivateLoc); |
8550 | |
8551 | // Build the fully-sugared type for this class template |
8552 | // specialization as the user wrote in the specialization |
8553 | // itself. This means that we'll pretty-print the type retrieved |
8554 | // from the specialization's declaration the way that the user |
8555 | // actually wrote the specialization, rather than formatting the |
8556 | // name based on the "canonical" representation used to store the |
8557 | // template arguments in the specialization. |
8558 | TypeSourceInfo *WrittenTy |
8559 | = Context.getTemplateSpecializationTypeInfo(Name, TemplateNameLoc, |
8560 | TemplateArgs, CanonType); |
8561 | if (TUK != TUK_Friend) { |
8562 | Specialization->setTypeAsWritten(WrittenTy); |
8563 | Specialization->setTemplateKeywordLoc(TemplateKWLoc); |
8564 | } |
8565 | |
8566 | // C++ [temp.expl.spec]p9: |
8567 | // A template explicit specialization is in the scope of the |
8568 | // namespace in which the template was defined. |
8569 | // |
8570 | // We actually implement this paragraph where we set the semantic |
8571 | // context (in the creation of the ClassTemplateSpecializationDecl), |
8572 | // but we also maintain the lexical context where the actual |
8573 | // definition occurs. |
8574 | Specialization->setLexicalDeclContext(CurContext); |
8575 | |
8576 | // We may be starting the definition of this specialization. |
8577 | if (TUK == TUK_Definition && (!SkipBody || !SkipBody->ShouldSkip)) |
8578 | Specialization->startDefinition(); |
8579 | |
8580 | if (TUK == TUK_Friend) { |
8581 | FriendDecl *Friend = FriendDecl::Create(Context, CurContext, |
8582 | TemplateNameLoc, |
8583 | WrittenTy, |
8584 | /*FIXME:*/KWLoc); |
8585 | Friend->setAccess(AS_public); |
8586 | CurContext->addDecl(Friend); |
8587 | } else { |
8588 | // Add the specialization into its lexical context, so that it can |
8589 | // be seen when iterating through the list of declarations in that |
8590 | // context. However, specializations are not found by name lookup. |
8591 | CurContext->addDecl(Specialization); |
8592 | } |
8593 | |
8594 | if (SkipBody && SkipBody->ShouldSkip) |
8595 | return SkipBody->Previous; |
8596 | |
8597 | return Specialization; |
8598 | } |
8599 | |
8600 | Decl *Sema::ActOnTemplateDeclarator(Scope *S, |
8601 | MultiTemplateParamsArg TemplateParameterLists, |
8602 | Declarator &D) { |
8603 | Decl *NewDecl = HandleDeclarator(S, D, TemplateParameterLists); |
8604 | ActOnDocumentableDecl(NewDecl); |
8605 | return NewDecl; |
8606 | } |
8607 | |
8608 | Decl *Sema::ActOnConceptDefinition(Scope *S, |
8609 | MultiTemplateParamsArg TemplateParameterLists, |
8610 | IdentifierInfo *Name, SourceLocation NameLoc, |
8611 | Expr *ConstraintExpr) { |
8612 | DeclContext *DC = CurContext; |
8613 | |
8614 | if (!DC->getRedeclContext()->isFileContext()) { |
8615 | Diag(NameLoc, |
8616 | diag::err_concept_decls_may_only_appear_in_global_namespace_scope); |
8617 | return nullptr; |
8618 | } |
8619 | |
8620 | if (TemplateParameterLists.size() > 1) { |
8621 | Diag(NameLoc, diag::err_concept_extra_headers); |
8622 | return nullptr; |
8623 | } |
8624 | |
8625 | if (TemplateParameterLists.front()->size() == 0) { |
8626 | Diag(NameLoc, diag::err_concept_no_parameters); |
8627 | return nullptr; |
8628 | } |
8629 | |
8630 | if (DiagnoseUnexpandedParameterPack(ConstraintExpr)) |
8631 | return nullptr; |
8632 | |
8633 | ConceptDecl *NewDecl = ConceptDecl::Create(Context, DC, NameLoc, Name, |
8634 | TemplateParameterLists.front(), |
8635 | ConstraintExpr); |
8636 | |
8637 | if (NewDecl->hasAssociatedConstraints()) { |
8638 | // C++2a [temp.concept]p4: |
8639 | // A concept shall not have associated constraints. |
8640 | Diag(NameLoc, diag::err_concept_no_associated_constraints); |
8641 | NewDecl->setInvalidDecl(); |
8642 | } |
8643 | |
8644 | // Check for conflicting previous declaration. |
8645 | DeclarationNameInfo NameInfo(NewDecl->getDeclName(), NameLoc); |
8646 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName, |
8647 | ForVisibleRedeclaration); |
8648 | LookupName(Previous, S); |
8649 | |
8650 | FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage=*/false, |
8651 | /*AllowInlineNamespace*/false); |
8652 | if (!Previous.empty()) { |
8653 | auto *Old = Previous.getRepresentativeDecl(); |
8654 | Diag(NameLoc, isa<ConceptDecl>(Old) ? diag::err_redefinition : |
8655 | diag::err_redefinition_different_kind) << NewDecl->getDeclName(); |
8656 | Diag(Old->getLocation(), diag::note_previous_definition); |
8657 | } |
8658 | |
8659 | ActOnDocumentableDecl(NewDecl); |
8660 | PushOnScopeChains(NewDecl, S); |
8661 | return NewDecl; |
8662 | } |
8663 | |
8664 | /// \brief Strips various properties off an implicit instantiation |
8665 | /// that has just been explicitly specialized. |
8666 | static void StripImplicitInstantiation(NamedDecl *D) { |
8667 | D->dropAttr<DLLImportAttr>(); |
8668 | D->dropAttr<DLLExportAttr>(); |
8669 | |
8670 | if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) |
8671 | FD->setInlineSpecified(false); |
8672 | } |
8673 | |
8674 | /// Compute the diagnostic location for an explicit instantiation |
8675 | // declaration or definition. |
8676 | static SourceLocation DiagLocForExplicitInstantiation( |
8677 | NamedDecl* D, SourceLocation PointOfInstantiation) { |
8678 | // Explicit instantiations following a specialization have no effect and |
8679 | // hence no PointOfInstantiation. In that case, walk decl backwards |
8680 | // until a valid name loc is found. |
8681 | SourceLocation PrevDiagLoc = PointOfInstantiation; |
8682 | for (Decl *Prev = D; Prev && !PrevDiagLoc.isValid(); |
8683 | Prev = Prev->getPreviousDecl()) { |
8684 | PrevDiagLoc = Prev->getLocation(); |
8685 | } |
8686 | assert(PrevDiagLoc.isValid() &&((void)0) |
8687 | "Explicit instantiation without point of instantiation?")((void)0); |
8688 | return PrevDiagLoc; |
8689 | } |
8690 | |
8691 | /// Diagnose cases where we have an explicit template specialization |
8692 | /// before/after an explicit template instantiation, producing diagnostics |
8693 | /// for those cases where they are required and determining whether the |
8694 | /// new specialization/instantiation will have any effect. |
8695 | /// |
8696 | /// \param NewLoc the location of the new explicit specialization or |
8697 | /// instantiation. |
8698 | /// |
8699 | /// \param NewTSK the kind of the new explicit specialization or instantiation. |
8700 | /// |
8701 | /// \param PrevDecl the previous declaration of the entity. |
8702 | /// |
8703 | /// \param PrevTSK the kind of the old explicit specialization or instantiatin. |
8704 | /// |
8705 | /// \param PrevPointOfInstantiation if valid, indicates where the previus |
8706 | /// declaration was instantiated (either implicitly or explicitly). |
8707 | /// |
8708 | /// \param HasNoEffect will be set to true to indicate that the new |
8709 | /// specialization or instantiation has no effect and should be ignored. |
8710 | /// |
8711 | /// \returns true if there was an error that should prevent the introduction of |
8712 | /// the new declaration into the AST, false otherwise. |
8713 | bool |
8714 | Sema::CheckSpecializationInstantiationRedecl(SourceLocation NewLoc, |
8715 | TemplateSpecializationKind NewTSK, |
8716 | NamedDecl *PrevDecl, |
8717 | TemplateSpecializationKind PrevTSK, |
8718 | SourceLocation PrevPointOfInstantiation, |
8719 | bool &HasNoEffect) { |
8720 | HasNoEffect = false; |
8721 | |
8722 | switch (NewTSK) { |
8723 | case TSK_Undeclared: |
8724 | case TSK_ImplicitInstantiation: |
8725 | assert(((void)0) |
8726 | (PrevTSK == TSK_Undeclared || PrevTSK == TSK_ImplicitInstantiation) &&((void)0) |
8727 | "previous declaration must be implicit!")((void)0); |
8728 | return false; |
8729 | |
8730 | case TSK_ExplicitSpecialization: |
8731 | switch (PrevTSK) { |
8732 | case TSK_Undeclared: |
8733 | case TSK_ExplicitSpecialization: |
8734 | // Okay, we're just specializing something that is either already |
8735 | // explicitly specialized or has merely been mentioned without any |
8736 | // instantiation. |
8737 | return false; |
8738 | |
8739 | case TSK_ImplicitInstantiation: |
8740 | if (PrevPointOfInstantiation.isInvalid()) { |
8741 | // The declaration itself has not actually been instantiated, so it is |
8742 | // still okay to specialize it. |
8743 | StripImplicitInstantiation(PrevDecl); |
8744 | return false; |
8745 | } |
8746 | // Fall through |
8747 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; |
8748 | |
8749 | case TSK_ExplicitInstantiationDeclaration: |
8750 | case TSK_ExplicitInstantiationDefinition: |
8751 | assert((PrevTSK == TSK_ImplicitInstantiation ||((void)0) |
8752 | PrevPointOfInstantiation.isValid()) &&((void)0) |
8753 | "Explicit instantiation without point of instantiation?")((void)0); |
8754 | |
8755 | // C++ [temp.expl.spec]p6: |
8756 | // If a template, a member template or the member of a class template |
8757 | // is explicitly specialized then that specialization shall be declared |
8758 | // before the first use of that specialization that would cause an |
8759 | // implicit instantiation to take place, in every translation unit in |
8760 | // which such a use occurs; no diagnostic is required. |
8761 | for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) { |
8762 | // Is there any previous explicit specialization declaration? |
8763 | if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) |
8764 | return false; |
8765 | } |
8766 | |
8767 | Diag(NewLoc, diag::err_specialization_after_instantiation) |
8768 | << PrevDecl; |
8769 | Diag(PrevPointOfInstantiation, diag::note_instantiation_required_here) |
8770 | << (PrevTSK != TSK_ImplicitInstantiation); |
8771 | |
8772 | return true; |
8773 | } |
8774 | llvm_unreachable("The switch over PrevTSK must be exhaustive.")__builtin_unreachable(); |
8775 | |
8776 | case TSK_ExplicitInstantiationDeclaration: |
8777 | switch (PrevTSK) { |
8778 | case TSK_ExplicitInstantiationDeclaration: |
8779 | // This explicit instantiation declaration is redundant (that's okay). |
8780 | HasNoEffect = true; |
8781 | return false; |
8782 | |
8783 | case TSK_Undeclared: |
8784 | case TSK_ImplicitInstantiation: |
8785 | // We're explicitly instantiating something that may have already been |
8786 | // implicitly instantiated; that's fine. |
8787 | return false; |
8788 | |
8789 | case TSK_ExplicitSpecialization: |
8790 | // C++0x [temp.explicit]p4: |
8791 | // For a given set of template parameters, if an explicit instantiation |
8792 | // of a template appears after a declaration of an explicit |
8793 | // specialization for that template, the explicit instantiation has no |
8794 | // effect. |
8795 | HasNoEffect = true; |
8796 | return false; |
8797 | |
8798 | case TSK_ExplicitInstantiationDefinition: |
8799 | // C++0x [temp.explicit]p10: |
8800 | // If an entity is the subject of both an explicit instantiation |
8801 | // declaration and an explicit instantiation definition in the same |
8802 | // translation unit, the definition shall follow the declaration. |
8803 | Diag(NewLoc, |
8804 | diag::err_explicit_instantiation_declaration_after_definition); |
8805 | |
8806 | // Explicit instantiations following a specialization have no effect and |
8807 | // hence no PrevPointOfInstantiation. In that case, walk decl backwards |
8808 | // until a valid name loc is found. |
8809 | Diag(DiagLocForExplicitInstantiation(PrevDecl, PrevPointOfInstantiation), |
8810 | diag::note_explicit_instantiation_definition_here); |
8811 | HasNoEffect = true; |
8812 | return false; |
8813 | } |
8814 | llvm_unreachable("Unexpected TemplateSpecializationKind!")__builtin_unreachable(); |
8815 | |
8816 | case TSK_ExplicitInstantiationDefinition: |
8817 | switch (PrevTSK) { |
8818 | case TSK_Undeclared: |
8819 | case TSK_ImplicitInstantiation: |
8820 | // We're explicitly instantiating something that may have already been |
8821 | // implicitly instantiated; that's fine. |
8822 | return false; |
8823 | |
8824 | case TSK_ExplicitSpecialization: |
8825 | // C++ DR 259, C++0x [temp.explicit]p4: |
8826 | // For a given set of template parameters, if an explicit |
8827 | // instantiation of a template appears after a declaration of |
8828 | // an explicit specialization for that template, the explicit |
8829 | // instantiation has no effect. |
8830 | Diag(NewLoc, diag::warn_explicit_instantiation_after_specialization) |
8831 | << PrevDecl; |
8832 | Diag(PrevDecl->getLocation(), |
8833 | diag::note_previous_template_specialization); |
8834 | HasNoEffect = true; |
8835 | return false; |
8836 | |
8837 | case TSK_ExplicitInstantiationDeclaration: |
8838 | // We're explicitly instantiating a definition for something for which we |
8839 | // were previously asked to suppress instantiations. That's fine. |
8840 | |
8841 | // C++0x [temp.explicit]p4: |
8842 | // For a given set of template parameters, if an explicit instantiation |
8843 | // of a template appears after a declaration of an explicit |
8844 | // specialization for that template, the explicit instantiation has no |
8845 | // effect. |
8846 | for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) { |
8847 | // Is there any previous explicit specialization declaration? |
8848 | if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) { |
8849 | HasNoEffect = true; |
8850 | break; |
8851 | } |
8852 | } |
8853 | |
8854 | return false; |
8855 | |
8856 | case TSK_ExplicitInstantiationDefinition: |
8857 | // C++0x [temp.spec]p5: |
8858 | // For a given template and a given set of template-arguments, |
8859 | // - an explicit instantiation definition shall appear at most once |
8860 | // in a program, |
8861 | |
8862 | // MSVCCompat: MSVC silently ignores duplicate explicit instantiations. |
8863 | Diag(NewLoc, (getLangOpts().MSVCCompat) |
8864 | ? diag::ext_explicit_instantiation_duplicate |
8865 | : diag::err_explicit_instantiation_duplicate) |
8866 | << PrevDecl; |
8867 | Diag(DiagLocForExplicitInstantiation(PrevDecl, PrevPointOfInstantiation), |
8868 | diag::note_previous_explicit_instantiation); |
8869 | HasNoEffect = true; |
8870 | return false; |
8871 | } |
8872 | } |
8873 | |
8874 | llvm_unreachable("Missing specialization/instantiation case?")__builtin_unreachable(); |
8875 | } |
8876 | |
8877 | /// Perform semantic analysis for the given dependent function |
8878 | /// template specialization. |
8879 | /// |
8880 | /// The only possible way to get a dependent function template specialization |
8881 | /// is with a friend declaration, like so: |
8882 | /// |
8883 | /// \code |
8884 | /// template \<class T> void foo(T); |
8885 | /// template \<class T> class A { |
8886 | /// friend void foo<>(T); |
8887 | /// }; |
8888 | /// \endcode |
8889 | /// |
8890 | /// There really isn't any useful analysis we can do here, so we |
8891 | /// just store the information. |
8892 | bool |
8893 | Sema::CheckDependentFunctionTemplateSpecialization(FunctionDecl *FD, |
8894 | const TemplateArgumentListInfo &ExplicitTemplateArgs, |
8895 | LookupResult &Previous) { |
8896 | // Remove anything from Previous that isn't a function template in |
8897 | // the correct context. |
8898 | DeclContext *FDLookupContext = FD->getDeclContext()->getRedeclContext(); |
8899 | LookupResult::Filter F = Previous.makeFilter(); |
8900 | enum DiscardReason { NotAFunctionTemplate, NotAMemberOfEnclosing }; |
8901 | SmallVector<std::pair<DiscardReason, Decl *>, 8> DiscardedCandidates; |
8902 | while (F.hasNext()) { |
8903 | NamedDecl *D = F.next()->getUnderlyingDecl(); |
8904 | if (!isa<FunctionTemplateDecl>(D)) { |
8905 | F.erase(); |
8906 | DiscardedCandidates.push_back(std::make_pair(NotAFunctionTemplate, D)); |
8907 | continue; |
8908 | } |
8909 | |
8910 | if (!FDLookupContext->InEnclosingNamespaceSetOf( |
8911 | D->getDeclContext()->getRedeclContext())) { |
8912 | F.erase(); |
8913 | DiscardedCandidates.push_back(std::make_pair(NotAMemberOfEnclosing, D)); |
8914 | continue; |
8915 | } |
8916 | } |
8917 | F.done(); |
8918 | |
8919 | if (Previous.empty()) { |
8920 | Diag(FD->getLocation(), |
8921 | diag::err_dependent_function_template_spec_no_match); |
8922 | for (auto &P : DiscardedCandidates) |
8923 | Diag(P.second->getLocation(), |
8924 | diag::note_dependent_function_template_spec_discard_reason) |
8925 | << P.first; |
8926 | return true; |
8927 | } |
8928 | |
8929 | FD->setDependentTemplateSpecialization(Context, Previous.asUnresolvedSet(), |
8930 | ExplicitTemplateArgs); |
8931 | return false; |
8932 | } |
8933 | |
8934 | /// Perform semantic analysis for the given function template |
8935 | /// specialization. |
8936 | /// |
8937 | /// This routine performs all of the semantic analysis required for an |
8938 | /// explicit function template specialization. On successful completion, |
8939 | /// the function declaration \p FD will become a function template |
8940 | /// specialization. |
8941 | /// |
8942 | /// \param FD the function declaration, which will be updated to become a |
8943 | /// function template specialization. |
8944 | /// |
8945 | /// \param ExplicitTemplateArgs the explicitly-provided template arguments, |
8946 | /// if any. Note that this may be valid info even when 0 arguments are |
8947 | /// explicitly provided as in, e.g., \c void sort<>(char*, char*); |
8948 | /// as it anyway contains info on the angle brackets locations. |
8949 | /// |
8950 | /// \param Previous the set of declarations that may be specialized by |
8951 | /// this function specialization. |
8952 | /// |
8953 | /// \param QualifiedFriend whether this is a lookup for a qualified friend |
8954 | /// declaration with no explicit template argument list that might be |
8955 | /// befriending a function template specialization. |
8956 | bool Sema::CheckFunctionTemplateSpecialization( |
8957 | FunctionDecl *FD, TemplateArgumentListInfo *ExplicitTemplateArgs, |
8958 | LookupResult &Previous, bool QualifiedFriend) { |
8959 | // The set of function template specializations that could match this |
8960 | // explicit function template specialization. |
8961 | UnresolvedSet<8> Candidates; |
8962 | TemplateSpecCandidateSet FailedCandidates(FD->getLocation(), |
8963 | /*ForTakingAddress=*/false); |
8964 | |
8965 | llvm::SmallDenseMap<FunctionDecl *, TemplateArgumentListInfo, 8> |
8966 | ConvertedTemplateArgs; |
8967 | |
8968 | DeclContext *FDLookupContext = FD->getDeclContext()->getRedeclContext(); |
8969 | for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); |
8970 | I != E; ++I) { |
8971 | NamedDecl *Ovl = (*I)->getUnderlyingDecl(); |
8972 | if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Ovl)) { |
8973 | // Only consider templates found within the same semantic lookup scope as |
8974 | // FD. |
8975 | if (!FDLookupContext->InEnclosingNamespaceSetOf( |
8976 | Ovl->getDeclContext()->getRedeclContext())) |
8977 | continue; |
8978 | |
8979 | // When matching a constexpr member function template specialization |
8980 | // against the primary template, we don't yet know whether the |
8981 | // specialization has an implicit 'const' (because we don't know whether |
8982 | // it will be a static member function until we know which template it |
8983 | // specializes), so adjust it now assuming it specializes this template. |
8984 | QualType FT = FD->getType(); |
8985 | if (FD->isConstexpr()) { |
8986 | CXXMethodDecl *OldMD = |
8987 | dyn_cast<CXXMethodDecl>(FunTmpl->getTemplatedDecl()); |
8988 | if (OldMD && OldMD->isConst()) { |
8989 | const FunctionProtoType *FPT = FT->castAs<FunctionProtoType>(); |
8990 | FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); |
8991 | EPI.TypeQuals.addConst(); |
8992 | FT = Context.getFunctionType(FPT->getReturnType(), |
8993 | FPT->getParamTypes(), EPI); |
8994 | } |
8995 | } |
8996 | |
8997 | TemplateArgumentListInfo Args; |
8998 | if (ExplicitTemplateArgs) |
8999 | Args = *ExplicitTemplateArgs; |
9000 | |
9001 | // C++ [temp.expl.spec]p11: |
9002 | // A trailing template-argument can be left unspecified in the |
9003 | // template-id naming an explicit function template specialization |
9004 | // provided it can be deduced from the function argument type. |
9005 | // Perform template argument deduction to determine whether we may be |
9006 | // specializing this template. |
9007 | // FIXME: It is somewhat wasteful to build |
9008 | TemplateDeductionInfo Info(FailedCandidates.getLocation()); |
9009 | FunctionDecl *Specialization = nullptr; |
9010 | if (TemplateDeductionResult TDK = DeduceTemplateArguments( |
9011 | cast<FunctionTemplateDecl>(FunTmpl->getFirstDecl()), |
9012 | ExplicitTemplateArgs ? &Args : nullptr, FT, Specialization, |
9013 | Info)) { |
9014 | // Template argument deduction failed; record why it failed, so |
9015 | // that we can provide nifty diagnostics. |
9016 | FailedCandidates.addCandidate().set( |
9017 | I.getPair(), FunTmpl->getTemplatedDecl(), |
9018 | MakeDeductionFailureInfo(Context, TDK, Info)); |
9019 | (void)TDK; |
9020 | continue; |
9021 | } |
9022 | |
9023 | // Target attributes are part of the cuda function signature, so |
9024 | // the deduced template's cuda target must match that of the |
9025 | // specialization. Given that C++ template deduction does not |
9026 | // take target attributes into account, we reject candidates |
9027 | // here that have a different target. |
9028 | if (LangOpts.CUDA && |
9029 | IdentifyCUDATarget(Specialization, |
9030 | /* IgnoreImplicitHDAttr = */ true) != |
9031 | IdentifyCUDATarget(FD, /* IgnoreImplicitHDAttr = */ true)) { |
9032 | FailedCandidates.addCandidate().set( |
9033 | I.getPair(), FunTmpl->getTemplatedDecl(), |
9034 | MakeDeductionFailureInfo(Context, TDK_CUDATargetMismatch, Info)); |
9035 | continue; |
9036 | } |
9037 | |
9038 | // Record this candidate. |
9039 | if (ExplicitTemplateArgs) |
9040 | ConvertedTemplateArgs[Specialization] = std::move(Args); |
9041 | Candidates.addDecl(Specialization, I.getAccess()); |
9042 | } |
9043 | } |
9044 | |
9045 | // For a qualified friend declaration (with no explicit marker to indicate |
9046 | // that a template specialization was intended), note all (template and |
9047 | // non-template) candidates. |
9048 | if (QualifiedFriend && Candidates.empty()) { |
9049 | Diag(FD->getLocation(), diag::err_qualified_friend_no_match) |
9050 | << FD->getDeclName() << FDLookupContext; |
9051 | // FIXME: We should form a single candidate list and diagnose all |
9052 | // candidates at once, to get proper sorting and limiting. |
9053 | for (auto *OldND : Previous) { |
9054 | if (auto *OldFD = dyn_cast<FunctionDecl>(OldND->getUnderlyingDecl())) |
9055 | NoteOverloadCandidate(OldND, OldFD, CRK_None, FD->getType(), false); |
9056 | } |
9057 | FailedCandidates.NoteCandidates(*this, FD->getLocation()); |
9058 | return true; |
9059 | } |
9060 | |
9061 | // Find the most specialized function template. |
9062 | UnresolvedSetIterator Result = getMostSpecialized( |
9063 | Candidates.begin(), Candidates.end(), FailedCandidates, FD->getLocation(), |
9064 | PDiag(diag::err_function_template_spec_no_match) << FD->getDeclName(), |
9065 | PDiag(diag::err_function_template_spec_ambiguous) |
9066 | << FD->getDeclName() << (ExplicitTemplateArgs != nullptr), |
9067 | PDiag(diag::note_function_template_spec_matched)); |
9068 | |
9069 | if (Result == Candidates.end()) |
9070 | return true; |
9071 | |
9072 | // Ignore access information; it doesn't figure into redeclaration checking. |
9073 | FunctionDecl *Specialization = cast<FunctionDecl>(*Result); |
9074 | |
9075 | FunctionTemplateSpecializationInfo *SpecInfo |
9076 | = Specialization->getTemplateSpecializationInfo(); |
9077 | assert(SpecInfo && "Function template specialization info missing?")((void)0); |
9078 | |
9079 | // Note: do not overwrite location info if previous template |
9080 | // specialization kind was explicit. |
9081 | TemplateSpecializationKind TSK = SpecInfo->getTemplateSpecializationKind(); |
9082 | if (TSK == TSK_Undeclared || TSK == TSK_ImplicitInstantiation) { |
9083 | Specialization->setLocation(FD->getLocation()); |
9084 | Specialization->setLexicalDeclContext(FD->getLexicalDeclContext()); |
9085 | // C++11 [dcl.constexpr]p1: An explicit specialization of a constexpr |
9086 | // function can differ from the template declaration with respect to |
9087 | // the constexpr specifier. |
9088 | // FIXME: We need an update record for this AST mutation. |
9089 | // FIXME: What if there are multiple such prior declarations (for instance, |
9090 | // from different modules)? |
9091 | Specialization->setConstexprKind(FD->getConstexprKind()); |
9092 | } |
9093 | |
9094 | // FIXME: Check if the prior specialization has a point of instantiation. |
9095 | // If so, we have run afoul of . |
9096 | |
9097 | // If this is a friend declaration, then we're not really declaring |
9098 | // an explicit specialization. |
9099 | bool isFriend = (FD->getFriendObjectKind() != Decl::FOK_None); |
9100 | |
9101 | // Check the scope of this explicit specialization. |
9102 | if (!isFriend && |
9103 | CheckTemplateSpecializationScope(*this, |
9104 | Specialization->getPrimaryTemplate(), |
9105 | Specialization, FD->getLocation(), |
9106 | false)) |
9107 | return true; |
9108 | |
9109 | // C++ [temp.expl.spec]p6: |
9110 | // If a template, a member template or the member of a class template is |
9111 | // explicitly specialized then that specialization shall be declared |
9112 | // before the first use of that specialization that would cause an implicit |
9113 | // instantiation to take place, in every translation unit in which such a |
9114 | // use occurs; no diagnostic is required. |
9115 | bool HasNoEffect = false; |
9116 | if (!isFriend && |
9117 | CheckSpecializationInstantiationRedecl(FD->getLocation(), |
9118 | TSK_ExplicitSpecialization, |
9119 | Specialization, |
9120 | SpecInfo->getTemplateSpecializationKind(), |
9121 | SpecInfo->getPointOfInstantiation(), |
9122 | HasNoEffect)) |
9123 | return true; |
9124 | |
9125 | // Mark the prior declaration as an explicit specialization, so that later |
9126 | // clients know that this is an explicit specialization. |
9127 | if (!isFriend) { |
9128 | // Since explicit specializations do not inherit '=delete' from their |
9129 | // primary function template - check if the 'specialization' that was |
9130 | // implicitly generated (during template argument deduction for partial |
9131 | // ordering) from the most specialized of all the function templates that |
9132 | // 'FD' could have been specializing, has a 'deleted' definition. If so, |
9133 | // first check that it was implicitly generated during template argument |
9134 | // deduction by making sure it wasn't referenced, and then reset the deleted |
9135 | // flag to not-deleted, so that we can inherit that information from 'FD'. |
9136 | if (Specialization->isDeleted() && !SpecInfo->isExplicitSpecialization() && |
9137 | !Specialization->getCanonicalDecl()->isReferenced()) { |
9138 | // FIXME: This assert will not hold in the presence of modules. |
9139 | assert(((void)0) |
9140 | Specialization->getCanonicalDecl() == Specialization &&((void)0) |
9141 | "This must be the only existing declaration of this specialization")((void)0); |
9142 | // FIXME: We need an update record for this AST mutation. |
9143 | Specialization->setDeletedAsWritten(false); |
9144 | } |
9145 | // FIXME: We need an update record for this AST mutation. |
9146 | SpecInfo->setTemplateSpecializationKind(TSK_ExplicitSpecialization); |
9147 | MarkUnusedFileScopedDecl(Specialization); |
9148 | } |
9149 | |
9150 | // Turn the given function declaration into a function template |
9151 | // specialization, with the template arguments from the previous |
9152 | // specialization. |
9153 | // Take copies of (semantic and syntactic) template argument lists. |
9154 | const TemplateArgumentList* TemplArgs = new (Context) |
9155 | TemplateArgumentList(Specialization->getTemplateSpecializationArgs()); |
9156 | FD->setFunctionTemplateSpecialization( |
9157 | Specialization->getPrimaryTemplate(), TemplArgs, /*InsertPos=*/nullptr, |
9158 | SpecInfo->getTemplateSpecializationKind(), |
9159 | ExplicitTemplateArgs ? &ConvertedTemplateArgs[Specialization] : nullptr); |
9160 | |
9161 | // A function template specialization inherits the target attributes |
9162 | // of its template. (We require the attributes explicitly in the |
9163 | // code to match, but a template may have implicit attributes by |
9164 | // virtue e.g. of being constexpr, and it passes these implicit |
9165 | // attributes on to its specializations.) |
9166 | if (LangOpts.CUDA) |
9167 | inheritCUDATargetAttrs(FD, *Specialization->getPrimaryTemplate()); |
9168 | |
9169 | // The "previous declaration" for this function template specialization is |
9170 | // the prior function template specialization. |
9171 | Previous.clear(); |
9172 | Previous.addDecl(Specialization); |
9173 | return false; |
9174 | } |
9175 | |
9176 | /// Perform semantic analysis for the given non-template member |
9177 | /// specialization. |
9178 | /// |
9179 | /// This routine performs all of the semantic analysis required for an |
9180 | /// explicit member function specialization. On successful completion, |
9181 | /// the function declaration \p FD will become a member function |
9182 | /// specialization. |
9183 | /// |
9184 | /// \param Member the member declaration, which will be updated to become a |
9185 | /// specialization. |
9186 | /// |
9187 | /// \param Previous the set of declarations, one of which may be specialized |
9188 | /// by this function specialization; the set will be modified to contain the |
9189 | /// redeclared member. |
9190 | bool |
9191 | Sema::CheckMemberSpecialization(NamedDecl *Member, LookupResult &Previous) { |
9192 | assert(!isa<TemplateDecl>(Member) && "Only for non-template members")((void)0); |
9193 | |
9194 | // Try to find the member we are instantiating. |
9195 | NamedDecl *FoundInstantiation = nullptr; |
9196 | NamedDecl *Instantiation = nullptr; |
9197 | NamedDecl *InstantiatedFrom = nullptr; |
9198 | MemberSpecializationInfo *MSInfo = nullptr; |
9199 | |
9200 | if (Previous.empty()) { |
9201 | // Nowhere to look anyway. |
9202 | } else if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Member)) { |
9203 | for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); |
9204 | I != E; ++I) { |
9205 | NamedDecl *D = (*I)->getUnderlyingDecl(); |
9206 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { |
9207 | QualType Adjusted = Function->getType(); |
9208 | if (!hasExplicitCallingConv(Adjusted)) |
9209 | Adjusted = adjustCCAndNoReturn(Adjusted, Method->getType()); |
9210 | // This doesn't handle deduced return types, but both function |
9211 | // declarations should be undeduced at this point. |
9212 | if (Context.hasSameType(Adjusted, Method->getType())) { |
9213 | FoundInstantiation = *I; |
9214 | Instantiation = Method; |
9215 | InstantiatedFrom = Method->getInstantiatedFromMemberFunction(); |
9216 | MSInfo = Method->getMemberSpecializationInfo(); |
9217 | break; |
9218 | } |
9219 | } |
9220 | } |
9221 | } else if (isa<VarDecl>(Member)) { |
9222 | VarDecl *PrevVar; |
9223 | if (Previous.isSingleResult() && |
9224 | (PrevVar = dyn_cast<VarDecl>(Previous.getFoundDecl()))) |
9225 | if (PrevVar->isStaticDataMember()) { |
9226 | FoundInstantiation = Previous.getRepresentativeDecl(); |
9227 | Instantiation = PrevVar; |
9228 | InstantiatedFrom = PrevVar->getInstantiatedFromStaticDataMember(); |
9229 | MSInfo = PrevVar->getMemberSpecializationInfo(); |
9230 | } |
9231 | } else if (isa<RecordDecl>(Member)) { |
9232 | CXXRecordDecl *PrevRecord; |
9233 | if (Previous.isSingleResult() && |
9234 | (PrevRecord = dyn_cast<CXXRecordDecl>(Previous.getFoundDecl()))) { |
9235 | FoundInstantiation = Previous.getRepresentativeDecl(); |
9236 | Instantiation = PrevRecord; |
9237 | InstantiatedFrom = PrevRecord->getInstantiatedFromMemberClass(); |
9238 | MSInfo = PrevRecord->getMemberSpecializationInfo(); |
9239 | } |
9240 | } else if (isa<EnumDecl>(Member)) { |
9241 | EnumDecl *PrevEnum; |
9242 | if (Previous.isSingleResult() && |
9243 | (PrevEnum = dyn_cast<EnumDecl>(Previous.getFoundDecl()))) { |
9244 | FoundInstantiation = Previous.getRepresentativeDecl(); |
9245 | Instantiation = PrevEnum; |
9246 | InstantiatedFrom = PrevEnum->getInstantiatedFromMemberEnum(); |
9247 | MSInfo = PrevEnum->getMemberSpecializationInfo(); |
9248 | } |
9249 | } |
9250 | |
9251 | if (!Instantiation) { |
9252 | // There is no previous declaration that matches. Since member |
9253 | // specializations are always out-of-line, the caller will complain about |
9254 | // this mismatch later. |
9255 | return false; |
9256 | } |
9257 | |
9258 | // A member specialization in a friend declaration isn't really declaring |
9259 | // an explicit specialization, just identifying a specific (possibly implicit) |
9260 | // specialization. Don't change the template specialization kind. |
9261 | // |
9262 | // FIXME: Is this really valid? Other compilers reject. |
9263 | if (Member->getFriendObjectKind() != Decl::FOK_None) { |
9264 | // Preserve instantiation information. |
9265 | if (InstantiatedFrom && isa<CXXMethodDecl>(Member)) { |
9266 | cast<CXXMethodDecl>(Member)->setInstantiationOfMemberFunction( |
9267 | cast<CXXMethodDecl>(InstantiatedFrom), |
9268 | cast<CXXMethodDecl>(Instantiation)->getTemplateSpecializationKind()); |
9269 | } else if (InstantiatedFrom && isa<CXXRecordDecl>(Member)) { |
9270 | cast<CXXRecordDecl>(Member)->setInstantiationOfMemberClass( |
9271 | cast<CXXRecordDecl>(InstantiatedFrom), |
9272 | cast<CXXRecordDecl>(Instantiation)->getTemplateSpecializationKind()); |
9273 | } |
9274 | |
9275 | Previous.clear(); |
9276 | Previous.addDecl(FoundInstantiation); |
9277 | return false; |
9278 | } |
9279 | |
9280 | // Make sure that this is a specialization of a member. |
9281 | if (!InstantiatedFrom) { |
9282 | Diag(Member->getLocation(), diag::err_spec_member_not_instantiated) |
9283 | << Member; |
9284 | Diag(Instantiation->getLocation(), diag::note_specialized_decl); |
9285 | return true; |
9286 | } |
9287 | |
9288 | // C++ [temp.expl.spec]p6: |
9289 | // If a template, a member template or the member of a class template is |
9290 | // explicitly specialized then that specialization shall be declared |
9291 | // before the first use of that specialization that would cause an implicit |
9292 | // instantiation to take place, in every translation unit in which such a |
9293 | // use occurs; no diagnostic is required. |
9294 | assert(MSInfo && "Member specialization info missing?")((void)0); |
9295 | |
9296 | bool HasNoEffect = false; |
9297 | if (CheckSpecializationInstantiationRedecl(Member->getLocation(), |
9298 | TSK_ExplicitSpecialization, |
9299 | Instantiation, |
9300 | MSInfo->getTemplateSpecializationKind(), |
9301 | MSInfo->getPointOfInstantiation(), |
9302 | HasNoEffect)) |
9303 | return true; |
9304 | |
9305 | // Check the scope of this explicit specialization. |
9306 | if (CheckTemplateSpecializationScope(*this, |
9307 | InstantiatedFrom, |
9308 | Instantiation, Member->getLocation(), |
9309 | false)) |
9310 | return true; |
9311 | |
9312 | // Note that this member specialization is an "instantiation of" the |
9313 | // corresponding member of the original template. |
9314 | if (auto *MemberFunction = dyn_cast<FunctionDecl>(Member)) { |
9315 | FunctionDecl *InstantiationFunction = cast<FunctionDecl>(Instantiation); |
9316 | if (InstantiationFunction->getTemplateSpecializationKind() == |
9317 | TSK_ImplicitInstantiation) { |
9318 | // Explicit specializations of member functions of class templates do not |
9319 | // inherit '=delete' from the member function they are specializing. |
9320 | if (InstantiationFunction->isDeleted()) { |
9321 | // FIXME: This assert will not hold in the presence of modules. |
9322 | assert(InstantiationFunction->getCanonicalDecl() ==((void)0) |
9323 | InstantiationFunction)((void)0); |
9324 | // FIXME: We need an update record for this AST mutation. |
9325 | InstantiationFunction->setDeletedAsWritten(false); |
9326 | } |
9327 | } |
9328 | |
9329 | MemberFunction->setInstantiationOfMemberFunction( |
9330 | cast<CXXMethodDecl>(InstantiatedFrom), TSK_ExplicitSpecialization); |
9331 | } else if (auto *MemberVar = dyn_cast<VarDecl>(Member)) { |
9332 | MemberVar->setInstantiationOfStaticDataMember( |
9333 | cast<VarDecl>(InstantiatedFrom), TSK_ExplicitSpecialization); |
9334 | } else if (auto *MemberClass = dyn_cast<CXXRecordDecl>(Member)) { |
9335 | MemberClass->setInstantiationOfMemberClass( |
9336 | cast<CXXRecordDecl>(InstantiatedFrom), TSK_ExplicitSpecialization); |
9337 | } else if (auto *MemberEnum = dyn_cast<EnumDecl>(Member)) { |
9338 | MemberEnum->setInstantiationOfMemberEnum( |
9339 | cast<EnumDecl>(InstantiatedFrom), TSK_ExplicitSpecialization); |
9340 | } else { |
9341 | llvm_unreachable("unknown member specialization kind")__builtin_unreachable(); |
9342 | } |
9343 | |
9344 | // Save the caller the trouble of having to figure out which declaration |
9345 | // this specialization matches. |
9346 | Previous.clear(); |
9347 | Previous.addDecl(FoundInstantiation); |
9348 | return false; |
9349 | } |
9350 | |
9351 | /// Complete the explicit specialization of a member of a class template by |
9352 | /// updating the instantiated member to be marked as an explicit specialization. |
9353 | /// |
9354 | /// \param OrigD The member declaration instantiated from the template. |
9355 | /// \param Loc The location of the explicit specialization of the member. |
9356 | template<typename DeclT> |
9357 | static void completeMemberSpecializationImpl(Sema &S, DeclT *OrigD, |
9358 | SourceLocation Loc) { |
9359 | if (OrigD->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) |
9360 | return; |
9361 | |
9362 | // FIXME: Inform AST mutation listeners of this AST mutation. |
9363 | // FIXME: If there are multiple in-class declarations of the member (from |
9364 | // multiple modules, or a declaration and later definition of a member type), |
9365 | // should we update all of them? |
9366 | OrigD->setTemplateSpecializationKind(TSK_ExplicitSpecialization); |
9367 | OrigD->setLocation(Loc); |
9368 | } |
9369 | |
9370 | void Sema::CompleteMemberSpecialization(NamedDecl *Member, |
9371 | LookupResult &Previous) { |
9372 | NamedDecl *Instantiation = cast<NamedDecl>(Member->getCanonicalDecl()); |
9373 | if (Instantiation == Member) |
9374 | return; |
9375 | |
9376 | if (auto *Function = dyn_cast<CXXMethodDecl>(Instantiation)) |
9377 | completeMemberSpecializationImpl(*this, Function, Member->getLocation()); |
9378 | else if (auto *Var = dyn_cast<VarDecl>(Instantiation)) |
9379 | completeMemberSpecializationImpl(*this, Var, Member->getLocation()); |
9380 | else if (auto *Record = dyn_cast<CXXRecordDecl>(Instantiation)) |
9381 | completeMemberSpecializationImpl(*this, Record, Member->getLocation()); |
9382 | else if (auto *Enum = dyn_cast<EnumDecl>(Instantiation)) |
9383 | completeMemberSpecializationImpl(*this, Enum, Member->getLocation()); |
9384 | else |
9385 | llvm_unreachable("unknown member specialization kind")__builtin_unreachable(); |
9386 | } |
9387 | |
9388 | /// Check the scope of an explicit instantiation. |
9389 | /// |
9390 | /// \returns true if a serious error occurs, false otherwise. |
9391 | static bool CheckExplicitInstantiationScope(Sema &S, NamedDecl *D, |
9392 | SourceLocation InstLoc, |
9393 | bool WasQualifiedName) { |
9394 | DeclContext *OrigContext= D->getDeclContext()->getEnclosingNamespaceContext(); |
9395 | DeclContext *CurContext = S.CurContext->getRedeclContext(); |
9396 | |
9397 | if (CurContext->isRecord()) { |
9398 | S.Diag(InstLoc, diag::err_explicit_instantiation_in_class) |
9399 | << D; |
9400 | return true; |
9401 | } |
9402 | |
9403 | // C++11 [temp.explicit]p3: |
9404 | // An explicit instantiation shall appear in an enclosing namespace of its |
9405 | // template. If the name declared in the explicit instantiation is an |
9406 | // unqualified name, the explicit instantiation shall appear in the |
9407 | // namespace where its template is declared or, if that namespace is inline |
9408 | // (7.3.1), any namespace from its enclosing namespace set. |
9409 | // |
9410 | // This is DR275, which we do not retroactively apply to C++98/03. |
9411 | if (WasQualifiedName) { |
9412 | if (CurContext->Encloses(OrigContext)) |
9413 | return false; |
9414 | } else { |
9415 | if (CurContext->InEnclosingNamespaceSetOf(OrigContext)) |
9416 | return false; |
9417 | } |
9418 | |
9419 | if (NamespaceDecl *NS = dyn_cast<NamespaceDecl>(OrigContext)) { |
9420 | if (WasQualifiedName) |
9421 | S.Diag(InstLoc, |
9422 | S.getLangOpts().CPlusPlus11? |
9423 | diag::err_explicit_instantiation_out_of_scope : |
9424 | diag::warn_explicit_instantiation_out_of_scope_0x) |
9425 | << D << NS; |
9426 | else |
9427 | S.Diag(InstLoc, |
9428 | S.getLangOpts().CPlusPlus11? |
9429 | diag::err_explicit_instantiation_unqualified_wrong_namespace : |
9430 | diag::warn_explicit_instantiation_unqualified_wrong_namespace_0x) |
9431 | << D << NS; |
9432 | } else |
9433 | S.Diag(InstLoc, |
9434 | S.getLangOpts().CPlusPlus11? |
9435 | diag::err_explicit_instantiation_must_be_global : |
9436 | diag::warn_explicit_instantiation_must_be_global_0x) |
9437 | << D; |
9438 | S.Diag(D->getLocation(), diag::note_explicit_instantiation_here); |
9439 | return false; |
9440 | } |
9441 | |
9442 | /// Common checks for whether an explicit instantiation of \p D is valid. |
9443 | static bool CheckExplicitInstantiation(Sema &S, NamedDecl *D, |
9444 | SourceLocation InstLoc, |
9445 | bool WasQualifiedName, |
9446 | TemplateSpecializationKind TSK) { |
9447 | // C++ [temp.explicit]p13: |
9448 | // An explicit instantiation declaration shall not name a specialization of |
9449 | // a template with internal linkage. |
9450 | if (TSK == TSK_ExplicitInstantiationDeclaration && |
9451 | D->getFormalLinkage() == InternalLinkage) { |
9452 | S.Diag(InstLoc, diag::err_explicit_instantiation_internal_linkage) << D; |
9453 | return true; |
9454 | } |
9455 | |
9456 | // C++11 [temp.explicit]p3: [DR 275] |
9457 | // An explicit instantiation shall appear in an enclosing namespace of its |
9458 | // template. |
9459 | if (CheckExplicitInstantiationScope(S, D, InstLoc, WasQualifiedName)) |
9460 | return true; |
9461 | |
9462 | return false; |
9463 | } |
9464 | |
9465 | /// Determine whether the given scope specifier has a template-id in it. |
9466 | static bool ScopeSpecifierHasTemplateId(const CXXScopeSpec &SS) { |
9467 | if (!SS.isSet()) |
9468 | return false; |
9469 | |
9470 | // C++11 [temp.explicit]p3: |
9471 | // If the explicit instantiation is for a member function, a member class |
9472 | // or a static data member of a class template specialization, the name of |
9473 | // the class template specialization in the qualified-id for the member |
9474 | // name shall be a simple-template-id. |
9475 | // |
9476 | // C++98 has the same restriction, just worded differently. |
9477 | for (NestedNameSpecifier *NNS = SS.getScopeRep(); NNS; |
9478 | NNS = NNS->getPrefix()) |
9479 | if (const Type *T = NNS->getAsType()) |
9480 | if (isa<TemplateSpecializationType>(T)) |
9481 | return true; |
9482 | |
9483 | return false; |
9484 | } |
9485 | |
9486 | /// Make a dllexport or dllimport attr on a class template specialization take |
9487 | /// effect. |
9488 | static void dllExportImportClassTemplateSpecialization( |
9489 | Sema &S, ClassTemplateSpecializationDecl *Def) { |
9490 | auto *A = cast_or_null<InheritableAttr>(getDLLAttr(Def)); |
9491 | assert(A && "dllExportImportClassTemplateSpecialization called "((void)0) |
9492 | "on Def without dllexport or dllimport")((void)0); |
9493 | |
9494 | // We reject explicit instantiations in class scope, so there should |
9495 | // never be any delayed exported classes to worry about. |
9496 | assert(S.DelayedDllExportClasses.empty() &&((void)0) |
9497 | "delayed exports present at explicit instantiation")((void)0); |
9498 | S.checkClassLevelDLLAttribute(Def); |
9499 | |
9500 | // Propagate attribute to base class templates. |
9501 | for (auto &B : Def->bases()) { |
9502 | if (auto *BT = dyn_cast_or_null<ClassTemplateSpecializationDecl>( |
9503 | B.getType()->getAsCXXRecordDecl())) |
9504 | S.propagateDLLAttrToBaseClassTemplate(Def, A, BT, B.getBeginLoc()); |
9505 | } |
9506 | |
9507 | S.referenceDLLExportedClassMethods(); |
9508 | } |
9509 | |
9510 | // Explicit instantiation of a class template specialization |
9511 | DeclResult Sema::ActOnExplicitInstantiation( |
9512 | Scope *S, SourceLocation ExternLoc, SourceLocation TemplateLoc, |
9513 | unsigned TagSpec, SourceLocation KWLoc, const CXXScopeSpec &SS, |
9514 | TemplateTy TemplateD, SourceLocation TemplateNameLoc, |
9515 | SourceLocation LAngleLoc, ASTTemplateArgsPtr TemplateArgsIn, |
9516 | SourceLocation RAngleLoc, const ParsedAttributesView &Attr) { |
9517 | // Find the class template we're specializing |
9518 | TemplateName Name = TemplateD.get(); |
9519 | TemplateDecl *TD = Name.getAsTemplateDecl(); |
9520 | // Check that the specialization uses the same tag kind as the |
9521 | // original template. |
9522 | TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); |
9523 | assert(Kind != TTK_Enum &&((void)0) |
9524 | "Invalid enum tag in class template explicit instantiation!")((void)0); |
9525 | |
9526 | ClassTemplateDecl *ClassTemplate = dyn_cast<ClassTemplateDecl>(TD); |
9527 | |
9528 | if (!ClassTemplate) { |
9529 | NonTagKind NTK = getNonTagTypeDeclKind(TD, Kind); |
9530 | Diag(TemplateNameLoc, diag::err_tag_reference_non_tag) << TD << NTK << Kind; |
9531 | Diag(TD->getLocation(), diag::note_previous_use); |
9532 | return true; |
9533 | } |
9534 | |
9535 | if (!isAcceptableTagRedeclaration(ClassTemplate->getTemplatedDecl(), |
9536 | Kind, /*isDefinition*/false, KWLoc, |
9537 | ClassTemplate->getIdentifier())) { |
9538 | Diag(KWLoc, diag::err_use_with_wrong_tag) |
9539 | << ClassTemplate |
9540 | << FixItHint::CreateReplacement(KWLoc, |
9541 | ClassTemplate->getTemplatedDecl()->getKindName()); |
9542 | Diag(ClassTemplate->getTemplatedDecl()->getLocation(), |
9543 | diag::note_previous_use); |
9544 | Kind = ClassTemplate->getTemplatedDecl()->getTagKind(); |
9545 | } |
9546 | |
9547 | // C++0x [temp.explicit]p2: |
9548 | // There are two forms of explicit instantiation: an explicit instantiation |
9549 | // definition and an explicit instantiation declaration. An explicit |
9550 | // instantiation declaration begins with the extern keyword. [...] |
9551 | TemplateSpecializationKind TSK = ExternLoc.isInvalid() |
9552 | ? TSK_ExplicitInstantiationDefinition |
9553 | : TSK_ExplicitInstantiationDeclaration; |
9554 | |
9555 | if (TSK == TSK_ExplicitInstantiationDeclaration && |
9556 | !Context.getTargetInfo().getTriple().isWindowsGNUEnvironment()) { |
9557 | // Check for dllexport class template instantiation declarations, |
9558 | // except for MinGW mode. |
9559 | for (const ParsedAttr &AL : Attr) { |
9560 | if (AL.getKind() == ParsedAttr::AT_DLLExport) { |
9561 | Diag(ExternLoc, |
9562 | diag::warn_attribute_dllexport_explicit_instantiation_decl); |
9563 | Diag(AL.getLoc(), diag::note_attribute); |
9564 | break; |
9565 | } |
9566 | } |
9567 | |
9568 | if (auto *A = ClassTemplate->getTemplatedDecl()->getAttr<DLLExportAttr>()) { |
9569 | Diag(ExternLoc, |
9570 | diag::warn_attribute_dllexport_explicit_instantiation_decl); |
9571 | Diag(A->getLocation(), diag::note_attribute); |
9572 | } |
9573 | } |
9574 | |
9575 | // In MSVC mode, dllimported explicit instantiation definitions are treated as |
9576 | // instantiation declarations for most purposes. |
9577 | bool DLLImportExplicitInstantiationDef = false; |
9578 | if (TSK == TSK_ExplicitInstantiationDefinition && |
9579 | Context.getTargetInfo().getCXXABI().isMicrosoft()) { |
9580 | // Check for dllimport class template instantiation definitions. |
9581 | bool DLLImport = |
9582 | ClassTemplate->getTemplatedDecl()->getAttr<DLLImportAttr>(); |
9583 | for (const ParsedAttr &AL : Attr) { |
9584 | if (AL.getKind() == ParsedAttr::AT_DLLImport) |
9585 | DLLImport = true; |
9586 | if (AL.getKind() == ParsedAttr::AT_DLLExport) { |
9587 | // dllexport trumps dllimport here. |
9588 | DLLImport = false; |
9589 | break; |
9590 | } |
9591 | } |
9592 | if (DLLImport) { |
9593 | TSK = TSK_ExplicitInstantiationDeclaration; |
9594 | DLLImportExplicitInstantiationDef = true; |
9595 | } |
9596 | } |
9597 | |
9598 | // Translate the parser's template argument list in our AST format. |
9599 | TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc); |
9600 | translateTemplateArguments(TemplateArgsIn, TemplateArgs); |
9601 | |
9602 | // Check that the template argument list is well-formed for this |
9603 | // template. |
9604 | SmallVector<TemplateArgument, 4> Converted; |
9605 | if (CheckTemplateArgumentList(ClassTemplate, TemplateNameLoc, |
9606 | TemplateArgs, false, Converted, |
9607 | /*UpdateArgsWithConversion=*/true)) |
9608 | return true; |
9609 | |
9610 | // Find the class template specialization declaration that |
9611 | // corresponds to these arguments. |
9612 | void *InsertPos = nullptr; |
9613 | ClassTemplateSpecializationDecl *PrevDecl |
9614 | = ClassTemplate->findSpecialization(Converted, InsertPos); |
9615 | |
9616 | TemplateSpecializationKind PrevDecl_TSK |
9617 | = PrevDecl ? PrevDecl->getTemplateSpecializationKind() : TSK_Undeclared; |
9618 | |
9619 | if (TSK == TSK_ExplicitInstantiationDefinition && PrevDecl != nullptr && |
9620 | Context.getTargetInfo().getTriple().isWindowsGNUEnvironment()) { |
9621 | // Check for dllexport class template instantiation definitions in MinGW |
9622 | // mode, if a previous declaration of the instantiation was seen. |
9623 | for (const ParsedAttr &AL : Attr) { |
9624 | if (AL.getKind() == ParsedAttr::AT_DLLExport) { |
9625 | Diag(AL.getLoc(), |
9626 | diag::warn_attribute_dllexport_explicit_instantiation_def); |
9627 | break; |
9628 | } |
9629 | } |
9630 | } |
9631 | |
9632 | if (CheckExplicitInstantiation(*this, ClassTemplate, TemplateNameLoc, |
9633 | SS.isSet(), TSK)) |
9634 | return true; |
9635 | |
9636 | ClassTemplateSpecializationDecl *Specialization = nullptr; |
9637 | |
9638 | bool HasNoEffect = false; |
9639 | if (PrevDecl) { |
9640 | if (CheckSpecializationInstantiationRedecl(TemplateNameLoc, TSK, |
9641 | PrevDecl, PrevDecl_TSK, |
9642 | PrevDecl->getPointOfInstantiation(), |
9643 | HasNoEffect)) |
9644 | return PrevDecl; |
9645 | |
9646 | // Even though HasNoEffect == true means that this explicit instantiation |
9647 | // has no effect on semantics, we go on to put its syntax in the AST. |
9648 | |
9649 | if (PrevDecl_TSK == TSK_ImplicitInstantiation || |
9650 | PrevDecl_TSK == TSK_Undeclared) { |
9651 | // Since the only prior class template specialization with these |
9652 | // arguments was referenced but not declared, reuse that |
9653 | // declaration node as our own, updating the source location |
9654 | // for the template name to reflect our new declaration. |
9655 | // (Other source locations will be updated later.) |
9656 | Specialization = PrevDecl; |
9657 | Specialization->setLocation(TemplateNameLoc); |
9658 | PrevDecl = nullptr; |
9659 | } |
9660 | |
9661 | if (PrevDecl_TSK == TSK_ExplicitInstantiationDeclaration && |
9662 | DLLImportExplicitInstantiationDef) { |
9663 | // The new specialization might add a dllimport attribute. |
9664 | HasNoEffect = false; |
9665 | } |
9666 | } |
9667 | |
9668 | if (!Specialization) { |
9669 | // Create a new class template specialization declaration node for |
9670 | // this explicit specialization. |
9671 | Specialization |
9672 | = ClassTemplateSpecializationDecl::Create(Context, Kind, |
9673 | ClassTemplate->getDeclContext(), |
9674 | KWLoc, TemplateNameLoc, |
9675 | ClassTemplate, |
9676 | Converted, |
9677 | PrevDecl); |
9678 | SetNestedNameSpecifier(*this, Specialization, SS); |
9679 | |
9680 | if (!HasNoEffect && !PrevDecl) { |
9681 | // Insert the new specialization. |
9682 | ClassTemplate->AddSpecialization(Specialization, InsertPos); |
9683 | } |
9684 | } |
9685 | |
9686 | // Build the fully-sugared type for this explicit instantiation as |
9687 | // the user wrote in the explicit instantiation itself. This means |
9688 | // that we'll pretty-print the type retrieved from the |
9689 | // specialization's declaration the way that the user actually wrote |
9690 | // the explicit instantiation, rather than formatting the name based |
9691 | // on the "canonical" representation used to store the template |
9692 | // arguments in the specialization. |
9693 | TypeSourceInfo *WrittenTy |
9694 | = Context.getTemplateSpecializationTypeInfo(Name, TemplateNameLoc, |
9695 | TemplateArgs, |
9696 | Context.getTypeDeclType(Specialization)); |
9697 | Specialization->setTypeAsWritten(WrittenTy); |
9698 | |
9699 | // Set source locations for keywords. |
9700 | Specialization->setExternLoc(ExternLoc); |
9701 | Specialization->setTemplateKeywordLoc(TemplateLoc); |
9702 | Specialization->setBraceRange(SourceRange()); |
9703 | |
9704 | bool PreviouslyDLLExported = Specialization->hasAttr<DLLExportAttr>(); |
9705 | ProcessDeclAttributeList(S, Specialization, Attr); |
9706 | |
9707 | // Add the explicit instantiation into its lexical context. However, |
9708 | // since explicit instantiations are never found by name lookup, we |
9709 | // just put it into the declaration context directly. |
9710 | Specialization->setLexicalDeclContext(CurContext); |
9711 | CurContext->addDecl(Specialization); |
9712 | |
9713 | // Syntax is now OK, so return if it has no other effect on semantics. |
9714 | if (HasNoEffect) { |
9715 | // Set the template specialization kind. |
9716 | Specialization->setTemplateSpecializationKind(TSK); |
9717 | return Specialization; |
9718 | } |
9719 | |
9720 | // C++ [temp.explicit]p3: |
9721 | // A definition of a class template or class member template |
9722 | // shall be in scope at the point of the explicit instantiation of |
9723 | // the class template or class member template. |
9724 | // |
9725 | // This check comes when we actually try to perform the |
9726 | // instantiation. |
9727 | ClassTemplateSpecializationDecl *Def |
9728 | = cast_or_null<ClassTemplateSpecializationDecl>( |
9729 | Specialization->getDefinition()); |
9730 | if (!Def) |
9731 | InstantiateClassTemplateSpecialization(TemplateNameLoc, Specialization, TSK); |
9732 | else if (TSK == TSK_ExplicitInstantiationDefinition) { |
9733 | MarkVTableUsed(TemplateNameLoc, Specialization, true); |
9734 | Specialization->setPointOfInstantiation(Def->getPointOfInstantiation()); |
9735 | } |
9736 | |
9737 | // Instantiate the members of this class template specialization. |
9738 | Def = cast_or_null<ClassTemplateSpecializationDecl>( |
9739 | Specialization->getDefinition()); |
9740 | if (Def) { |
9741 | TemplateSpecializationKind Old_TSK = Def->getTemplateSpecializationKind(); |
9742 | // Fix a TSK_ExplicitInstantiationDeclaration followed by a |
9743 | // TSK_ExplicitInstantiationDefinition |
9744 | if (Old_TSK == TSK_ExplicitInstantiationDeclaration && |
9745 | (TSK == TSK_ExplicitInstantiationDefinition || |
9746 | DLLImportExplicitInstantiationDef)) { |
9747 | // FIXME: Need to notify the ASTMutationListener that we did this. |
9748 | Def->setTemplateSpecializationKind(TSK); |
9749 | |
9750 | if (!getDLLAttr(Def) && getDLLAttr(Specialization) && |
9751 | (Context.getTargetInfo().shouldDLLImportComdatSymbols() && |
9752 | !Context.getTargetInfo().getTriple().isPS4CPU())) { |
9753 | // An explicit instantiation definition can add a dll attribute to a |
9754 | // template with a previous instantiation declaration. MinGW doesn't |
9755 | // allow this. |
9756 | auto *A = cast<InheritableAttr>( |
9757 | getDLLAttr(Specialization)->clone(getASTContext())); |
9758 | A->setInherited(true); |
9759 | Def->addAttr(A); |
9760 | dllExportImportClassTemplateSpecialization(*this, Def); |
9761 | } |
9762 | } |
9763 | |
9764 | // Fix a TSK_ImplicitInstantiation followed by a |
9765 | // TSK_ExplicitInstantiationDefinition |
9766 | bool NewlyDLLExported = |
9767 | !PreviouslyDLLExported && Specialization->hasAttr<DLLExportAttr>(); |
9768 | if (Old_TSK == TSK_ImplicitInstantiation && NewlyDLLExported && |
9769 | (Context.getTargetInfo().shouldDLLImportComdatSymbols() && |
9770 | !Context.getTargetInfo().getTriple().isPS4CPU())) { |
9771 | // An explicit instantiation definition can add a dll attribute to a |
9772 | // template with a previous implicit instantiation. MinGW doesn't allow |
9773 | // this. We limit clang to only adding dllexport, to avoid potentially |
9774 | // strange codegen behavior. For example, if we extend this conditional |
9775 | // to dllimport, and we have a source file calling a method on an |
9776 | // implicitly instantiated template class instance and then declaring a |
9777 | // dllimport explicit instantiation definition for the same template |
9778 | // class, the codegen for the method call will not respect the dllimport, |
9779 | // while it will with cl. The Def will already have the DLL attribute, |
9780 | // since the Def and Specialization will be the same in the case of |
9781 | // Old_TSK == TSK_ImplicitInstantiation, and we already added the |
9782 | // attribute to the Specialization; we just need to make it take effect. |
9783 | assert(Def == Specialization &&((void)0) |
9784 | "Def and Specialization should match for implicit instantiation")((void)0); |
9785 | dllExportImportClassTemplateSpecialization(*this, Def); |
9786 | } |
9787 | |
9788 | // In MinGW mode, export the template instantiation if the declaration |
9789 | // was marked dllexport. |
9790 | if (PrevDecl_TSK == TSK_ExplicitInstantiationDeclaration && |
9791 | Context.getTargetInfo().getTriple().isWindowsGNUEnvironment() && |
9792 | PrevDecl->hasAttr<DLLExportAttr>()) { |
9793 | dllExportImportClassTemplateSpecialization(*this, Def); |
9794 | } |
9795 | |
9796 | if (Def->hasAttr<MSInheritanceAttr>()) { |
9797 | Specialization->addAttr(Def->getAttr<MSInheritanceAttr>()); |
9798 | Consumer.AssignInheritanceModel(Specialization); |
9799 | } |
9800 | |
9801 | // Set the template specialization kind. Make sure it is set before |
9802 | // instantiating the members which will trigger ASTConsumer callbacks. |
9803 | Specialization->setTemplateSpecializationKind(TSK); |
9804 | InstantiateClassTemplateSpecializationMembers(TemplateNameLoc, Def, TSK); |
9805 | } else { |
9806 | |
9807 | // Set the template specialization kind. |
9808 | Specialization->setTemplateSpecializationKind(TSK); |
9809 | } |
9810 | |
9811 | return Specialization; |
9812 | } |
9813 | |
9814 | // Explicit instantiation of a member class of a class template. |
9815 | DeclResult |
9816 | Sema::ActOnExplicitInstantiation(Scope *S, SourceLocation ExternLoc, |
9817 | SourceLocation TemplateLoc, unsigned TagSpec, |
9818 | SourceLocation KWLoc, CXXScopeSpec &SS, |
9819 | IdentifierInfo *Name, SourceLocation NameLoc, |
9820 | const ParsedAttributesView &Attr) { |
9821 | |
9822 | bool Owned = false; |
9823 | bool IsDependent = false; |
9824 | Decl *TagD = ActOnTag(S, TagSpec, Sema::TUK_Reference, |
9825 | KWLoc, SS, Name, NameLoc, Attr, AS_none, |
9826 | /*ModulePrivateLoc=*/SourceLocation(), |
9827 | MultiTemplateParamsArg(), Owned, IsDependent, |
9828 | SourceLocation(), false, TypeResult(), |
9829 | /*IsTypeSpecifier*/false, |
9830 | /*IsTemplateParamOrArg*/false); |
9831 | assert(!IsDependent && "explicit instantiation of dependent name not yet handled")((void)0); |
9832 | |
9833 | if (!TagD) |
9834 | return true; |
9835 | |
9836 | TagDecl *Tag = cast<TagDecl>(TagD); |
9837 | assert(!Tag->isEnum() && "shouldn't see enumerations here")((void)0); |
9838 | |
9839 | if (Tag->isInvalidDecl()) |
9840 | return true; |
9841 | |
9842 | CXXRecordDecl *Record = cast<CXXRecordDecl>(Tag); |
9843 | CXXRecordDecl *Pattern = Record->getInstantiatedFromMemberClass(); |
9844 | if (!Pattern) { |
9845 | Diag(TemplateLoc, diag::err_explicit_instantiation_nontemplate_type) |
9846 | << Context.getTypeDeclType(Record); |
9847 | Diag(Record->getLocation(), diag::note_nontemplate_decl_here); |
9848 | return true; |
9849 | } |
9850 | |
9851 | // C++0x [temp.explicit]p2: |
9852 | // If the explicit instantiation is for a class or member class, the |
9853 | // elaborated-type-specifier in the declaration shall include a |
9854 | // simple-template-id. |
9855 | // |
9856 | // C++98 has the same restriction, just worded differently. |
9857 | if (!ScopeSpecifierHasTemplateId(SS)) |
9858 | Diag(TemplateLoc, diag::ext_explicit_instantiation_without_qualified_id) |
9859 | << Record << SS.getRange(); |
9860 | |
9861 | // C++0x [temp.explicit]p2: |
9862 | // There are two forms of explicit instantiation: an explicit instantiation |
9863 | // definition and an explicit instantiation declaration. An explicit |
9864 | // instantiation declaration begins with the extern keyword. [...] |
9865 | TemplateSpecializationKind TSK |
9866 | = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition |
9867 | : TSK_ExplicitInstantiationDeclaration; |
9868 | |
9869 | CheckExplicitInstantiation(*this, Record, NameLoc, true, TSK); |
9870 | |
9871 | // Verify that it is okay to explicitly instantiate here. |
9872 | CXXRecordDecl *PrevDecl |
9873 | = cast_or_null<CXXRecordDecl>(Record->getPreviousDecl()); |
9874 | if (!PrevDecl && Record->getDefinition()) |
9875 | PrevDecl = Record; |
9876 | if (PrevDecl) { |
9877 | MemberSpecializationInfo *MSInfo = PrevDecl->getMemberSpecializationInfo(); |
9878 | bool HasNoEffect = false; |
9879 | assert(MSInfo && "No member specialization information?")((void)0); |
9880 | if (CheckSpecializationInstantiationRedecl(TemplateLoc, TSK, |
9881 | PrevDecl, |
9882 | MSInfo->getTemplateSpecializationKind(), |
9883 | MSInfo->getPointOfInstantiation(), |
9884 | HasNoEffect)) |
9885 | return true; |
9886 | if (HasNoEffect) |
9887 | return TagD; |
9888 | } |
9889 | |
9890 | CXXRecordDecl *RecordDef |
9891 | = cast_or_null<CXXRecordDecl>(Record->getDefinition()); |
9892 | if (!RecordDef) { |
9893 | // C++ [temp.explicit]p3: |
9894 | // A definition of a member class of a class template shall be in scope |
9895 | // at the point of an explicit instantiation of the member class. |
9896 | CXXRecordDecl *Def |
9897 | = cast_or_null<CXXRecordDecl>(Pattern->getDefinition()); |
9898 | if (!Def) { |
9899 | Diag(TemplateLoc, diag::err_explicit_instantiation_undefined_member) |
9900 | << 0 << Record->getDeclName() << Record->getDeclContext(); |
9901 | Diag(Pattern->getLocation(), diag::note_forward_declaration) |
9902 | << Pattern; |
9903 | return true; |
9904 | } else { |
9905 | if (InstantiateClass(NameLoc, Record, Def, |
9906 | getTemplateInstantiationArgs(Record), |
9907 | TSK)) |
9908 | return true; |
9909 | |
9910 | RecordDef = cast_or_null<CXXRecordDecl>(Record->getDefinition()); |
9911 | if (!RecordDef) |
9912 | return true; |
9913 | } |
9914 | } |
9915 | |
9916 | // Instantiate all of the members of the class. |
9917 | InstantiateClassMembers(NameLoc, RecordDef, |
9918 | getTemplateInstantiationArgs(Record), TSK); |
9919 | |
9920 | if (TSK == TSK_ExplicitInstantiationDefinition) |
9921 | MarkVTableUsed(NameLoc, RecordDef, true); |
9922 | |
9923 | // FIXME: We don't have any representation for explicit instantiations of |
9924 | // member classes. Such a representation is not needed for compilation, but it |
9925 | // should be available for clients that want to see all of the declarations in |
9926 | // the source code. |
9927 | return TagD; |
9928 | } |
9929 | |
9930 | DeclResult Sema::ActOnExplicitInstantiation(Scope *S, |
9931 | SourceLocation ExternLoc, |
9932 | SourceLocation TemplateLoc, |
9933 | Declarator &D) { |
9934 | // Explicit instantiations always require a name. |
9935 | // TODO: check if/when DNInfo should replace Name. |
9936 | DeclarationNameInfo NameInfo = GetNameForDeclarator(D); |
9937 | DeclarationName Name = NameInfo.getName(); |
9938 | if (!Name) { |
9939 | if (!D.isInvalidType()) |
9940 | Diag(D.getDeclSpec().getBeginLoc(), |
9941 | diag::err_explicit_instantiation_requires_name) |
9942 | << D.getDeclSpec().getSourceRange() << D.getSourceRange(); |
9943 | |
9944 | return true; |
9945 | } |
9946 | |
9947 | // The scope passed in may not be a decl scope. Zip up the scope tree until |
9948 | // we find one that is. |
9949 | while ((S->getFlags() & Scope::DeclScope) == 0 || |
9950 | (S->getFlags() & Scope::TemplateParamScope) != 0) |
9951 | S = S->getParent(); |
9952 | |
9953 | // Determine the type of the declaration. |
9954 | TypeSourceInfo *T = GetTypeForDeclarator(D, S); |
9955 | QualType R = T->getType(); |
9956 | if (R.isNull()) |
9957 | return true; |
9958 | |
9959 | // C++ [dcl.stc]p1: |
9960 | // A storage-class-specifier shall not be specified in [...] an explicit |
9961 | // instantiation (14.7.2) directive. |
9962 | if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { |
9963 | Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_of_typedef) |
9964 | << Name; |
9965 | return true; |
9966 | } else if (D.getDeclSpec().getStorageClassSpec() |
9967 | != DeclSpec::SCS_unspecified) { |
9968 | // Complain about then remove the storage class specifier. |
9969 | Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_storage_class) |
9970 | << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); |
9971 | |
9972 | D.getMutableDeclSpec().ClearStorageClassSpecs(); |
9973 | } |
9974 | |
9975 | // C++0x [temp.explicit]p1: |
9976 | // [...] An explicit instantiation of a function template shall not use the |
9977 | // inline or constexpr specifiers. |
9978 | // Presumably, this also applies to member functions of class templates as |
9979 | // well. |
9980 | if (D.getDeclSpec().isInlineSpecified()) |
9981 | Diag(D.getDeclSpec().getInlineSpecLoc(), |
9982 | getLangOpts().CPlusPlus11 ? |
9983 | diag::err_explicit_instantiation_inline : |
9984 | diag::warn_explicit_instantiation_inline_0x) |
9985 | << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); |
9986 | if (D.getDeclSpec().hasConstexprSpecifier() && R->isFunctionType()) |
9987 | // FIXME: Add a fix-it to remove the 'constexpr' and add a 'const' if one is |
9988 | // not already specified. |
9989 | Diag(D.getDeclSpec().getConstexprSpecLoc(), |
9990 | diag::err_explicit_instantiation_constexpr); |
9991 | |
9992 | // A deduction guide is not on the list of entities that can be explicitly |
9993 | // instantiated. |
9994 | if (Name.getNameKind() == DeclarationName::CXXDeductionGuideName) { |
9995 | Diag(D.getDeclSpec().getBeginLoc(), diag::err_deduction_guide_specialized) |
9996 | << /*explicit instantiation*/ 0; |
9997 | return true; |
9998 | } |
9999 | |
10000 | // C++0x [temp.explicit]p2: |
10001 | // There are two forms of explicit instantiation: an explicit instantiation |
10002 | // definition and an explicit instantiation declaration. An explicit |
10003 | // instantiation declaration begins with the extern keyword. [...] |
10004 | TemplateSpecializationKind TSK |
10005 | = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition |
10006 | : TSK_ExplicitInstantiationDeclaration; |
10007 | |
10008 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName); |
10009 | LookupParsedName(Previous, S, &D.getCXXScopeSpec()); |
10010 | |
10011 | if (!R->isFunctionType()) { |
10012 | // C++ [temp.explicit]p1: |
10013 | // A [...] static data member of a class template can be explicitly |
10014 | // instantiated from the member definition associated with its class |
10015 | // template. |
10016 | // C++1y [temp.explicit]p1: |
10017 | // A [...] variable [...] template specialization can be explicitly |
10018 | // instantiated from its template. |
10019 | if (Previous.isAmbiguous()) |
10020 | return true; |
10021 | |
10022 | VarDecl *Prev = Previous.getAsSingle<VarDecl>(); |
10023 | VarTemplateDecl *PrevTemplate = Previous.getAsSingle<VarTemplateDecl>(); |
10024 | |
10025 | if (!PrevTemplate) { |
10026 | if (!Prev || !Prev->isStaticDataMember()) { |
10027 | // We expect to see a static data member here. |
10028 | Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_not_known) |
10029 | << Name; |
10030 | for (LookupResult::iterator P = Previous.begin(), PEnd = Previous.end(); |
10031 | P != PEnd; ++P) |
10032 | Diag((*P)->getLocation(), diag::note_explicit_instantiation_here); |
10033 | return true; |
10034 | } |
10035 | |
10036 | if (!Prev->getInstantiatedFromStaticDataMember()) { |
10037 | // FIXME: Check for explicit specialization? |
10038 | Diag(D.getIdentifierLoc(), |
10039 | diag::err_explicit_instantiation_data_member_not_instantiated) |
10040 | << Prev; |
10041 | Diag(Prev->getLocation(), diag::note_explicit_instantiation_here); |
10042 | // FIXME: Can we provide a note showing where this was declared? |
10043 | return true; |
10044 | } |
10045 | } else { |
10046 | // Explicitly instantiate a variable template. |
10047 | |
10048 | // C++1y [dcl.spec.auto]p6: |
10049 | // ... A program that uses auto or decltype(auto) in a context not |
10050 | // explicitly allowed in this section is ill-formed. |
10051 | // |
10052 | // This includes auto-typed variable template instantiations. |
10053 | if (R->isUndeducedType()) { |
10054 | Diag(T->getTypeLoc().getBeginLoc(), |
10055 | diag::err_auto_not_allowed_var_inst); |
10056 | return true; |
10057 | } |
10058 | |
10059 | if (D.getName().getKind() != UnqualifiedIdKind::IK_TemplateId) { |
10060 | // C++1y [temp.explicit]p3: |
10061 | // If the explicit instantiation is for a variable, the unqualified-id |
10062 | // in the declaration shall be a template-id. |
10063 | Diag(D.getIdentifierLoc(), |
10064 | diag::err_explicit_instantiation_without_template_id) |
10065 | << PrevTemplate; |
10066 | Diag(PrevTemplate->getLocation(), |
10067 | diag::note_explicit_instantiation_here); |
10068 | return true; |
10069 | } |
10070 | |
10071 | // Translate the parser's template argument list into our AST format. |
10072 | TemplateArgumentListInfo TemplateArgs = |
10073 | makeTemplateArgumentListInfo(*this, *D.getName().TemplateId); |
10074 | |
10075 | DeclResult Res = CheckVarTemplateId(PrevTemplate, TemplateLoc, |
10076 | D.getIdentifierLoc(), TemplateArgs); |
10077 | if (Res.isInvalid()) |
10078 | return true; |
10079 | |
10080 | if (!Res.isUsable()) { |
10081 | // We somehow specified dependent template arguments in an explicit |
10082 | // instantiation. This should probably only happen during error |
10083 | // recovery. |
10084 | Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_dependent); |
10085 | return true; |
10086 | } |
10087 | |
10088 | // Ignore access control bits, we don't need them for redeclaration |
10089 | // checking. |
10090 | Prev = cast<VarDecl>(Res.get()); |
10091 | } |
10092 | |
10093 | // C++0x [temp.explicit]p2: |
10094 | // If the explicit instantiation is for a member function, a member class |
10095 | // or a static data member of a class template specialization, the name of |
10096 | // the class template specialization in the qualified-id for the member |
10097 | // name shall be a simple-template-id. |
10098 | // |
10099 | // C++98 has the same restriction, just worded differently. |
10100 | // |
10101 | // This does not apply to variable template specializations, where the |
10102 | // template-id is in the unqualified-id instead. |
10103 | if (!ScopeSpecifierHasTemplateId(D.getCXXScopeSpec()) && !PrevTemplate) |
10104 | Diag(D.getIdentifierLoc(), |
10105 | diag::ext_explicit_instantiation_without_qualified_id) |
10106 | << Prev << D.getCXXScopeSpec().getRange(); |
10107 | |
10108 | CheckExplicitInstantiation(*this, Prev, D.getIdentifierLoc(), true, TSK); |
10109 | |
10110 | // Verify that it is okay to explicitly instantiate here. |
10111 | TemplateSpecializationKind PrevTSK = Prev->getTemplateSpecializationKind(); |
10112 | SourceLocation POI = Prev->getPointOfInstantiation(); |
10113 | bool HasNoEffect = false; |
10114 | if (CheckSpecializationInstantiationRedecl(D.getIdentifierLoc(), TSK, Prev, |
10115 | PrevTSK, POI, HasNoEffect)) |
10116 | return true; |
10117 | |
10118 | if (!HasNoEffect) { |
10119 | // Instantiate static data member or variable template. |
10120 | Prev->setTemplateSpecializationKind(TSK, D.getIdentifierLoc()); |
10121 | // Merge attributes. |
10122 | ProcessDeclAttributeList(S, Prev, D.getDeclSpec().getAttributes()); |
10123 | if (TSK == TSK_ExplicitInstantiationDefinition) |
10124 | InstantiateVariableDefinition(D.getIdentifierLoc(), Prev); |
10125 | } |
10126 | |
10127 | // Check the new variable specialization against the parsed input. |
10128 | if (PrevTemplate && Prev && !Context.hasSameType(Prev->getType(), R)) { |
10129 | Diag(T->getTypeLoc().getBeginLoc(), |
10130 | diag::err_invalid_var_template_spec_type) |
10131 | << 0 << PrevTemplate << R << Prev->getType(); |
10132 | Diag(PrevTemplate->getLocation(), diag::note_template_declared_here) |
10133 | << 2 << PrevTemplate->getDeclName(); |
10134 | return true; |
10135 | } |
10136 | |
10137 | // FIXME: Create an ExplicitInstantiation node? |
10138 | return (Decl*) nullptr; |
10139 | } |
10140 | |
10141 | // If the declarator is a template-id, translate the parser's template |
10142 | // argument list into our AST format. |
10143 | bool HasExplicitTemplateArgs = false; |
10144 | TemplateArgumentListInfo TemplateArgs; |
10145 | if (D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId) { |
10146 | TemplateArgs = makeTemplateArgumentListInfo(*this, *D.getName().TemplateId); |
10147 | HasExplicitTemplateArgs = true; |
10148 | } |
10149 | |
10150 | // C++ [temp.explicit]p1: |
10151 | // A [...] function [...] can be explicitly instantiated from its template. |
10152 | // A member function [...] of a class template can be explicitly |
10153 | // instantiated from the member definition associated with its class |
10154 | // template. |
10155 | UnresolvedSet<8> TemplateMatches; |
10156 | FunctionDecl *NonTemplateMatch = nullptr; |
10157 | TemplateSpecCandidateSet FailedCandidates(D.getIdentifierLoc()); |
10158 | for (LookupResult::iterator P = Previous.begin(), PEnd = Previous.end(); |
10159 | P != PEnd; ++P) { |
10160 | NamedDecl *Prev = *P; |
10161 | if (!HasExplicitTemplateArgs) { |
10162 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Prev)) { |
10163 | QualType Adjusted = adjustCCAndNoReturn(R, Method->getType(), |
10164 | /*AdjustExceptionSpec*/true); |
10165 | if (Context.hasSameUnqualifiedType(Method->getType(), Adjusted)) { |
10166 | if (Method->getPrimaryTemplate()) { |
10167 | TemplateMatches.addDecl(Method, P.getAccess()); |
10168 | } else { |
10169 | // FIXME: Can this assert ever happen? Needs a test. |
10170 | assert(!NonTemplateMatch && "Multiple NonTemplateMatches")((void)0); |
10171 | NonTemplateMatch = Method; |
10172 | } |
10173 | } |
10174 | } |
10175 | } |
10176 | |
10177 | FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Prev); |
10178 | if (!FunTmpl) |
10179 | continue; |
10180 | |
10181 | TemplateDeductionInfo Info(FailedCandidates.getLocation()); |
10182 | FunctionDecl *Specialization = nullptr; |
10183 | if (TemplateDeductionResult TDK |
10184 | = DeduceTemplateArguments(FunTmpl, |
10185 | (HasExplicitTemplateArgs ? &TemplateArgs |
10186 | : nullptr), |
10187 | R, Specialization, Info)) { |
10188 | // Keep track of almost-matches. |
10189 | FailedCandidates.addCandidate() |
10190 | .set(P.getPair(), FunTmpl->getTemplatedDecl(), |
10191 | MakeDeductionFailureInfo(Context, TDK, Info)); |
10192 | (void)TDK; |
10193 | continue; |
10194 | } |
10195 | |
10196 | // Target attributes are part of the cuda function signature, so |
10197 | // the cuda target of the instantiated function must match that of its |
10198 | // template. Given that C++ template deduction does not take |
10199 | // target attributes into account, we reject candidates here that |
10200 | // have a different target. |
10201 | if (LangOpts.CUDA && |
10202 | IdentifyCUDATarget(Specialization, |
10203 | /* IgnoreImplicitHDAttr = */ true) != |
10204 | IdentifyCUDATarget(D.getDeclSpec().getAttributes())) { |
10205 | FailedCandidates.addCandidate().set( |
10206 | P.getPair(), FunTmpl->getTemplatedDecl(), |
10207 | MakeDeductionFailureInfo(Context, TDK_CUDATargetMismatch, Info)); |
10208 | continue; |
10209 | } |
10210 | |
10211 | TemplateMatches.addDecl(Specialization, P.getAccess()); |
10212 | } |
10213 | |
10214 | FunctionDecl *Specialization = NonTemplateMatch; |
10215 | if (!Specialization) { |
10216 | // Find the most specialized function template specialization. |
10217 | UnresolvedSetIterator Result = getMostSpecialized( |
10218 | TemplateMatches.begin(), TemplateMatches.end(), FailedCandidates, |
10219 | D.getIdentifierLoc(), |
10220 | PDiag(diag::err_explicit_instantiation_not_known) << Name, |
10221 | PDiag(diag::err_explicit_instantiation_ambiguous) << Name, |
10222 | PDiag(diag::note_explicit_instantiation_candidate)); |
10223 | |
10224 | if (Result == TemplateMatches.end()) |
10225 | return true; |
10226 | |
10227 | // Ignore access control bits, we don't need them for redeclaration checking. |
10228 | Specialization = cast<FunctionDecl>(*Result); |
10229 | } |
10230 | |
10231 | // C++11 [except.spec]p4 |
10232 | // In an explicit instantiation an exception-specification may be specified, |
10233 | // but is not required. |
10234 | // If an exception-specification is specified in an explicit instantiation |
10235 | // directive, it shall be compatible with the exception-specifications of |
10236 | // other declarations of that function. |
10237 | if (auto *FPT = R->getAs<FunctionProtoType>()) |
10238 | if (FPT->hasExceptionSpec()) { |
10239 | unsigned DiagID = |
10240 | diag::err_mismatched_exception_spec_explicit_instantiation; |
10241 | if (getLangOpts().MicrosoftExt) |
10242 | DiagID = diag::ext_mismatched_exception_spec_explicit_instantiation; |
10243 | bool Result = CheckEquivalentExceptionSpec( |
10244 | PDiag(DiagID) << Specialization->getType(), |
10245 | PDiag(diag::note_explicit_instantiation_here), |
10246 | Specialization->getType()->getAs<FunctionProtoType>(), |
10247 | Specialization->getLocation(), FPT, D.getBeginLoc()); |
10248 | // In Microsoft mode, mismatching exception specifications just cause a |
10249 | // warning. |
10250 | if (!getLangOpts().MicrosoftExt && Result) |
10251 | return true; |
10252 | } |
10253 | |
10254 | if (Specialization->getTemplateSpecializationKind() == TSK_Undeclared) { |
10255 | Diag(D.getIdentifierLoc(), |
10256 | diag::err_explicit_instantiation_member_function_not_instantiated) |
10257 | << Specialization |
10258 | << (Specialization->getTemplateSpecializationKind() == |
10259 | TSK_ExplicitSpecialization); |
10260 | Diag(Specialization->getLocation(), diag::note_explicit_instantiation_here); |
10261 | return true; |
10262 | } |
10263 | |
10264 | FunctionDecl *PrevDecl = Specialization->getPreviousDecl(); |
10265 | if (!PrevDecl && Specialization->isThisDeclarationADefinition()) |
10266 | PrevDecl = Specialization; |
10267 | |
10268 | if (PrevDecl) { |
10269 | bool HasNoEffect = false; |
10270 | if (CheckSpecializationInstantiationRedecl(D.getIdentifierLoc(), TSK, |
10271 | PrevDecl, |
10272 | PrevDecl->getTemplateSpecializationKind(), |
10273 | PrevDecl->getPointOfInstantiation(), |
10274 | HasNoEffect)) |
10275 | return true; |
10276 | |
10277 | // FIXME: We may still want to build some representation of this |
10278 | // explicit specialization. |
10279 | if (HasNoEffect) |
10280 | return (Decl*) nullptr; |
10281 | } |
10282 | |
10283 | // HACK: libc++ has a bug where it attempts to explicitly instantiate the |
10284 | // functions |
10285 | // valarray<size_t>::valarray(size_t) and |
10286 | // valarray<size_t>::~valarray() |
10287 | // that it declared to have internal linkage with the internal_linkage |
10288 | // attribute. Ignore the explicit instantiation declaration in this case. |
10289 | if (Specialization->hasAttr<InternalLinkageAttr>() && |
10290 | TSK == TSK_ExplicitInstantiationDeclaration) { |
10291 | if (auto *RD = dyn_cast<CXXRecordDecl>(Specialization->getDeclContext())) |
10292 | if (RD->getIdentifier() && RD->getIdentifier()->isStr("valarray") && |
10293 | RD->isInStdNamespace()) |
10294 | return (Decl*) nullptr; |
10295 | } |
10296 | |
10297 | ProcessDeclAttributeList(S, Specialization, D.getDeclSpec().getAttributes()); |
10298 | |
10299 | // In MSVC mode, dllimported explicit instantiation definitions are treated as |
10300 | // instantiation declarations. |
10301 | if (TSK == TSK_ExplicitInstantiationDefinition && |
10302 | Specialization->hasAttr<DLLImportAttr>() && |
10303 | Context.getTargetInfo().getCXXABI().isMicrosoft()) |
10304 | TSK = TSK_ExplicitInstantiationDeclaration; |
10305 | |
10306 | Specialization->setTemplateSpecializationKind(TSK, D.getIdentifierLoc()); |
10307 | |
10308 | if (Specialization->isDefined()) { |
10309 | // Let the ASTConsumer know that this function has been explicitly |
10310 | // instantiated now, and its linkage might have changed. |
10311 | Consumer.HandleTopLevelDecl(DeclGroupRef(Specialization)); |
10312 | } else if (TSK == TSK_ExplicitInstantiationDefinition) |
10313 | InstantiateFunctionDefinition(D.getIdentifierLoc(), Specialization); |
10314 | |
10315 | // C++0x [temp.explicit]p2: |
10316 | // If the explicit instantiation is for a member function, a member class |
10317 | // or a static data member of a class template specialization, the name of |
10318 | // the class template specialization in the qualified-id for the member |
10319 | // name shall be a simple-template-id. |
10320 | // |
10321 | // C++98 has the same restriction, just worded differently. |
10322 | FunctionTemplateDecl *FunTmpl = Specialization->getPrimaryTemplate(); |
10323 | if (D.getName().getKind() != UnqualifiedIdKind::IK_TemplateId && !FunTmpl && |
10324 | D.getCXXScopeSpec().isSet() && |
10325 | !ScopeSpecifierHasTemplateId(D.getCXXScopeSpec())) |
10326 | Diag(D.getIdentifierLoc(), |
10327 | diag::ext_explicit_instantiation_without_qualified_id) |
10328 | << Specialization << D.getCXXScopeSpec().getRange(); |
10329 | |
10330 | CheckExplicitInstantiation( |
10331 | *this, |
10332 | FunTmpl ? (NamedDecl *)FunTmpl |
10333 | : Specialization->getInstantiatedFromMemberFunction(), |
10334 | D.getIdentifierLoc(), D.getCXXScopeSpec().isSet(), TSK); |
10335 | |
10336 | // FIXME: Create some kind of ExplicitInstantiationDecl here. |
10337 | return (Decl*) nullptr; |
10338 | } |
10339 | |
10340 | TypeResult |
10341 | Sema::ActOnDependentTag(Scope *S, unsigned TagSpec, TagUseKind TUK, |
10342 | const CXXScopeSpec &SS, IdentifierInfo *Name, |
10343 | SourceLocation TagLoc, SourceLocation NameLoc) { |
10344 | // This has to hold, because SS is expected to be defined. |
10345 | assert(Name && "Expected a name in a dependent tag")((void)0); |
10346 | |
10347 | NestedNameSpecifier *NNS = SS.getScopeRep(); |
10348 | if (!NNS) |
10349 | return true; |
10350 | |
10351 | TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); |
10352 | |
10353 | if (TUK == TUK_Declaration || TUK == TUK_Definition) { |
10354 | Diag(NameLoc, diag::err_dependent_tag_decl) |
10355 | << (TUK == TUK_Definition) << Kind << SS.getRange(); |
10356 | return true; |
10357 | } |
10358 | |
10359 | // Create the resulting type. |
10360 | ElaboratedTypeKeyword Kwd = TypeWithKeyword::getKeywordForTagTypeKind(Kind); |
10361 | QualType Result = Context.getDependentNameType(Kwd, NNS, Name); |
10362 | |
10363 | // Create type-source location information for this type. |
10364 | TypeLocBuilder TLB; |
10365 | DependentNameTypeLoc TL = TLB.push<DependentNameTypeLoc>(Result); |
10366 | TL.setElaboratedKeywordLoc(TagLoc); |
10367 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); |
10368 | TL.setNameLoc(NameLoc); |
10369 | return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result)); |
10370 | } |
10371 | |
10372 | TypeResult |
10373 | Sema::ActOnTypenameType(Scope *S, SourceLocation TypenameLoc, |
10374 | const CXXScopeSpec &SS, const IdentifierInfo &II, |
10375 | SourceLocation IdLoc) { |
10376 | if (SS.isInvalid()) |
10377 | return true; |
10378 | |
10379 | if (TypenameLoc.isValid() && S && !S->getTemplateParamParent()) |
10380 | Diag(TypenameLoc, |
10381 | getLangOpts().CPlusPlus11 ? |
10382 | diag::warn_cxx98_compat_typename_outside_of_template : |
10383 | diag::ext_typename_outside_of_template) |
10384 | << FixItHint::CreateRemoval(TypenameLoc); |
10385 | |
10386 | NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); |
10387 | TypeSourceInfo *TSI = nullptr; |
10388 | QualType T = CheckTypenameType(TypenameLoc.isValid()? ETK_Typename : ETK_None, |
10389 | TypenameLoc, QualifierLoc, II, IdLoc, &TSI, |
10390 | /*DeducedTSTContext=*/true); |
10391 | if (T.isNull()) |
10392 | return true; |
10393 | return CreateParsedType(T, TSI); |
10394 | } |
10395 | |
10396 | TypeResult |
10397 | Sema::ActOnTypenameType(Scope *S, |
10398 | SourceLocation TypenameLoc, |
10399 | const CXXScopeSpec &SS, |
10400 | SourceLocation TemplateKWLoc, |
10401 | TemplateTy TemplateIn, |
10402 | IdentifierInfo *TemplateII, |
10403 | SourceLocation TemplateIILoc, |
10404 | SourceLocation LAngleLoc, |
10405 | ASTTemplateArgsPtr TemplateArgsIn, |
10406 | SourceLocation RAngleLoc) { |
10407 | if (TypenameLoc.isValid() && S && !S->getTemplateParamParent()) |
10408 | Diag(TypenameLoc, |
10409 | getLangOpts().CPlusPlus11 ? |
10410 | diag::warn_cxx98_compat_typename_outside_of_template : |
10411 | diag::ext_typename_outside_of_template) |
10412 | << FixItHint::CreateRemoval(TypenameLoc); |
10413 | |
10414 | // Strangely, non-type results are not ignored by this lookup, so the |
10415 | // program is ill-formed if it finds an injected-class-name. |
10416 | if (TypenameLoc.isValid()) { |
10417 | auto *LookupRD = |
10418 | dyn_cast_or_null<CXXRecordDecl>(computeDeclContext(SS, false)); |
10419 | if (LookupRD && LookupRD->getIdentifier() == TemplateII) { |
10420 | Diag(TemplateIILoc, |
10421 | diag::ext_out_of_line_qualified_id_type_names_constructor) |
10422 | << TemplateII << 0 /*injected-class-name used as template name*/ |
10423 | << (TemplateKWLoc.isValid() ? 1 : 0 /*'template'/'typename' keyword*/); |
10424 | } |
10425 | } |
10426 | |
10427 | // Translate the parser's template argument list in our AST format. |
10428 | TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc); |
10429 | translateTemplateArguments(TemplateArgsIn, TemplateArgs); |
10430 | |
10431 | TemplateName Template = TemplateIn.get(); |
10432 | if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) { |
10433 | // Construct a dependent template specialization type. |
10434 | assert(DTN && "dependent template has non-dependent name?")((void)0); |
10435 | assert(DTN->getQualifier() == SS.getScopeRep())((void)0); |
10436 | QualType T = Context.getDependentTemplateSpecializationType(ETK_Typename, |
10437 | DTN->getQualifier(), |
10438 | DTN->getIdentifier(), |
10439 | TemplateArgs); |
10440 | |
10441 | // Create source-location information for this type. |
10442 | TypeLocBuilder Builder; |
10443 | DependentTemplateSpecializationTypeLoc SpecTL |
10444 | = Builder.push<DependentTemplateSpecializationTypeLoc>(T); |
10445 | SpecTL.setElaboratedKeywordLoc(TypenameLoc); |
10446 | SpecTL.setQualifierLoc(SS.getWithLocInContext(Context)); |
10447 | SpecTL.setTemplateKeywordLoc(TemplateKWLoc); |
10448 | SpecTL.setTemplateNameLoc(TemplateIILoc); |
10449 | SpecTL.setLAngleLoc(LAngleLoc); |
10450 | SpecTL.setRAngleLoc(RAngleLoc); |
10451 | for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) |
10452 | SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo()); |
10453 | return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); |
10454 | } |
10455 | |
10456 | QualType T = CheckTemplateIdType(Template, TemplateIILoc, TemplateArgs); |
10457 | if (T.isNull()) |
10458 | return true; |
10459 | |
10460 | // Provide source-location information for the template specialization type. |
10461 | TypeLocBuilder Builder; |
10462 | TemplateSpecializationTypeLoc SpecTL |
10463 | = Builder.push<TemplateSpecializationTypeLoc>(T); |
10464 | SpecTL.setTemplateKeywordLoc(TemplateKWLoc); |
10465 | SpecTL.setTemplateNameLoc(TemplateIILoc); |
10466 | SpecTL.setLAngleLoc(LAngleLoc); |
10467 | SpecTL.setRAngleLoc(RAngleLoc); |
10468 | for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) |
10469 | SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo()); |
10470 | |
10471 | T = Context.getElaboratedType(ETK_Typename, SS.getScopeRep(), T); |
10472 | ElaboratedTypeLoc TL = Builder.push<ElaboratedTypeLoc>(T); |
10473 | TL.setElaboratedKeywordLoc(TypenameLoc); |
10474 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); |
10475 | |
10476 | TypeSourceInfo *TSI = Builder.getTypeSourceInfo(Context, T); |
10477 | return CreateParsedType(T, TSI); |
10478 | } |
10479 | |
10480 | |
10481 | /// Determine whether this failed name lookup should be treated as being |
10482 | /// disabled by a usage of std::enable_if. |
10483 | static bool isEnableIf(NestedNameSpecifierLoc NNS, const IdentifierInfo &II, |
10484 | SourceRange &CondRange, Expr *&Cond) { |
10485 | // We must be looking for a ::type... |
10486 | if (!II.isStr("type")) |
10487 | return false; |
10488 | |
10489 | // ... within an explicitly-written template specialization... |
10490 | if (!NNS || !NNS.getNestedNameSpecifier()->getAsType()) |
10491 | return false; |
10492 | TypeLoc EnableIfTy = NNS.getTypeLoc(); |
10493 | TemplateSpecializationTypeLoc EnableIfTSTLoc = |
10494 | EnableIfTy.getAs<TemplateSpecializationTypeLoc>(); |
10495 | if (!EnableIfTSTLoc || EnableIfTSTLoc.getNumArgs() == 0) |
10496 | return false; |
10497 | const TemplateSpecializationType *EnableIfTST = EnableIfTSTLoc.getTypePtr(); |
10498 | |
10499 | // ... which names a complete class template declaration... |
10500 | const TemplateDecl *EnableIfDecl = |
10501 | EnableIfTST->getTemplateName().getAsTemplateDecl(); |
10502 | if (!EnableIfDecl || EnableIfTST->isIncompleteType()) |
10503 | return false; |
10504 | |
10505 | // ... called "enable_if". |
10506 | const IdentifierInfo *EnableIfII = |
10507 | EnableIfDecl->getDeclName().getAsIdentifierInfo(); |
10508 | if (!EnableIfII || !EnableIfII->isStr("enable_if")) |
10509 | return false; |
10510 | |
10511 | // Assume the first template argument is the condition. |
10512 | CondRange = EnableIfTSTLoc.getArgLoc(0).getSourceRange(); |
10513 | |
10514 | // Dig out the condition. |
10515 | Cond = nullptr; |
10516 | if (EnableIfTSTLoc.getArgLoc(0).getArgument().getKind() |
10517 | != TemplateArgument::Expression) |
10518 | return true; |
10519 | |
10520 | Cond = EnableIfTSTLoc.getArgLoc(0).getSourceExpression(); |
10521 | |
10522 | // Ignore Boolean literals; they add no value. |
10523 | if (isa<CXXBoolLiteralExpr>(Cond->IgnoreParenCasts())) |
10524 | Cond = nullptr; |
10525 | |
10526 | return true; |
10527 | } |
10528 | |
10529 | QualType |
10530 | Sema::CheckTypenameType(ElaboratedTypeKeyword Keyword, |
10531 | SourceLocation KeywordLoc, |
10532 | NestedNameSpecifierLoc QualifierLoc, |
10533 | const IdentifierInfo &II, |
10534 | SourceLocation IILoc, |
10535 | TypeSourceInfo **TSI, |
10536 | bool DeducedTSTContext) { |
10537 | QualType T = CheckTypenameType(Keyword, KeywordLoc, QualifierLoc, II, IILoc, |
10538 | DeducedTSTContext); |
10539 | if (T.isNull()) |
10540 | return QualType(); |
10541 | |
10542 | *TSI = Context.CreateTypeSourceInfo(T); |
10543 | if (isa<DependentNameType>(T)) { |
10544 | DependentNameTypeLoc TL = |
10545 | (*TSI)->getTypeLoc().castAs<DependentNameTypeLoc>(); |
10546 | TL.setElaboratedKeywordLoc(KeywordLoc); |
10547 | TL.setQualifierLoc(QualifierLoc); |
10548 | TL.setNameLoc(IILoc); |
10549 | } else { |
10550 | ElaboratedTypeLoc TL = (*TSI)->getTypeLoc().castAs<ElaboratedTypeLoc>(); |
10551 | TL.setElaboratedKeywordLoc(KeywordLoc); |
10552 | TL.setQualifierLoc(QualifierLoc); |
10553 | TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(IILoc); |
10554 | } |
10555 | return T; |
10556 | } |
10557 | |
10558 | /// Build the type that describes a C++ typename specifier, |
10559 | /// e.g., "typename T::type". |
10560 | QualType |
10561 | Sema::CheckTypenameType(ElaboratedTypeKeyword Keyword, |
10562 | SourceLocation KeywordLoc, |
10563 | NestedNameSpecifierLoc QualifierLoc, |
10564 | const IdentifierInfo &II, |
10565 | SourceLocation IILoc, bool DeducedTSTContext) { |
10566 | CXXScopeSpec SS; |
10567 | SS.Adopt(QualifierLoc); |
10568 | |
10569 | DeclContext *Ctx = nullptr; |
10570 | if (QualifierLoc) { |
10571 | Ctx = computeDeclContext(SS); |
10572 | if (!Ctx) { |
10573 | // If the nested-name-specifier is dependent and couldn't be |
10574 | // resolved to a type, build a typename type. |
10575 | assert(QualifierLoc.getNestedNameSpecifier()->isDependent())((void)0); |
10576 | return Context.getDependentNameType(Keyword, |
10577 | QualifierLoc.getNestedNameSpecifier(), |
10578 | &II); |
10579 | } |
10580 | |
10581 | // If the nested-name-specifier refers to the current instantiation, |
10582 | // the "typename" keyword itself is superfluous. In C++03, the |
10583 | // program is actually ill-formed. However, DR 382 (in C++0x CD1) |
10584 | // allows such extraneous "typename" keywords, and we retroactively |
10585 | // apply this DR to C++03 code with only a warning. In any case we continue. |
10586 | |
10587 | if (RequireCompleteDeclContext(SS, Ctx)) |
10588 | return QualType(); |
10589 | } |
10590 | |
10591 | DeclarationName Name(&II); |
10592 | LookupResult Result(*this, Name, IILoc, LookupOrdinaryName); |
10593 | if (Ctx) |
10594 | LookupQualifiedName(Result, Ctx, SS); |
10595 | else |
10596 | LookupName(Result, CurScope); |
10597 | unsigned DiagID = 0; |
10598 | Decl *Referenced = nullptr; |
10599 | switch (Result.getResultKind()) { |
10600 | case LookupResult::NotFound: { |
10601 | // If we're looking up 'type' within a template named 'enable_if', produce |
10602 | // a more specific diagnostic. |
10603 | SourceRange CondRange; |
10604 | Expr *Cond = nullptr; |
10605 | if (Ctx && isEnableIf(QualifierLoc, II, CondRange, Cond)) { |
10606 | // If we have a condition, narrow it down to the specific failed |
10607 | // condition. |
10608 | if (Cond) { |
10609 | Expr *FailedCond; |
10610 | std::string FailedDescription; |
10611 | std::tie(FailedCond, FailedDescription) = |
10612 | findFailedBooleanCondition(Cond); |
10613 | |
10614 | Diag(FailedCond->getExprLoc(), |
10615 | diag::err_typename_nested_not_found_requirement) |
10616 | << FailedDescription |
10617 | << FailedCond->getSourceRange(); |
10618 | return QualType(); |
10619 | } |
10620 | |
10621 | Diag(CondRange.getBegin(), |
10622 | diag::err_typename_nested_not_found_enable_if) |
10623 | << Ctx << CondRange; |
10624 | return QualType(); |
10625 | } |
10626 | |
10627 | DiagID = Ctx ? diag::err_typename_nested_not_found |
10628 | : diag::err_unknown_typename; |
10629 | break; |
10630 | } |
10631 | |
10632 | case LookupResult::FoundUnresolvedValue: { |
10633 | // We found a using declaration that is a value. Most likely, the using |
10634 | // declaration itself is meant to have the 'typename' keyword. |
10635 | SourceRange FullRange(KeywordLoc.isValid() ? KeywordLoc : SS.getBeginLoc(), |
10636 | IILoc); |
10637 | Diag(IILoc, diag::err_typename_refers_to_using_value_decl) |
10638 | << Name << Ctx << FullRange; |
10639 | if (UnresolvedUsingValueDecl *Using |
10640 | = dyn_cast<UnresolvedUsingValueDecl>(Result.getRepresentativeDecl())){ |
10641 | SourceLocation Loc = Using->getQualifierLoc().getBeginLoc(); |
10642 | Diag(Loc, diag::note_using_value_decl_missing_typename) |
10643 | << FixItHint::CreateInsertion(Loc, "typename "); |
10644 | } |
10645 | } |
10646 | // Fall through to create a dependent typename type, from which we can recover |
10647 | // better. |
10648 | LLVM_FALLTHROUGH[[gnu::fallthrough]]; |
10649 | |
10650 | case LookupResult::NotFoundInCurrentInstantiation: |
10651 | // Okay, it's a member of an unknown instantiation. |
10652 | return Context.getDependentNameType(Keyword, |
10653 | QualifierLoc.getNestedNameSpecifier(), |
10654 | &II); |
10655 | |
10656 | case LookupResult::Found: |
10657 | if (TypeDecl *Type = dyn_cast<TypeDecl>(Result.getFoundDecl())) { |
10658 | // C++ [class.qual]p2: |
10659 | // In a lookup in which function names are not ignored and the |
10660 | // nested-name-specifier nominates a class C, if the name specified |
10661 | // after the nested-name-specifier, when looked up in C, is the |
10662 | // injected-class-name of C [...] then the name is instead considered |
10663 | // to name the constructor of class C. |
10664 | // |
10665 | // Unlike in an elaborated-type-specifier, function names are not ignored |
10666 | // in typename-specifier lookup. However, they are ignored in all the |
10667 | // contexts where we form a typename type with no keyword (that is, in |
10668 | // mem-initializer-ids, base-specifiers, and elaborated-type-specifiers). |
10669 | // |
10670 | // FIXME: That's not strictly true: mem-initializer-id lookup does not |
10671 | // ignore functions, but that appears to be an oversight. |
10672 | auto *LookupRD = dyn_cast_or_null<CXXRecordDecl>(Ctx); |
10673 | auto *FoundRD = dyn_cast<CXXRecordDecl>(Type); |
10674 | if (Keyword == ETK_Typename && LookupRD && FoundRD && |
10675 | FoundRD->isInjectedClassName() && |
10676 | declaresSameEntity(LookupRD, cast<Decl>(FoundRD->getParent()))) |
10677 | Diag(IILoc, diag::ext_out_of_line_qualified_id_type_names_constructor) |
10678 | << &II << 1 << 0 /*'typename' keyword used*/; |
10679 | |
10680 | // We found a type. Build an ElaboratedType, since the |
10681 | // typename-specifier was just sugar. |
10682 | MarkAnyDeclReferenced(Type->getLocation(), Type, /*OdrUse=*/false); |
10683 | return Context.getElaboratedType(Keyword, |
10684 | QualifierLoc.getNestedNameSpecifier(), |
10685 | Context.getTypeDeclType(Type)); |
10686 | } |
10687 | |
10688 | // C++ [dcl.type.simple]p2: |
10689 | // A type-specifier of the form |
10690 | // typename[opt] nested-name-specifier[opt] template-name |
10691 | // is a placeholder for a deduced class type [...]. |
10692 | if (getLangOpts().CPlusPlus17) { |
10693 | if (auto *TD = getAsTypeTemplateDecl(Result.getFoundDecl())) { |
10694 | if (!DeducedTSTContext) { |
10695 | QualType T(QualifierLoc |
10696 | ? QualifierLoc.getNestedNameSpecifier()->getAsType() |
10697 | : nullptr, 0); |
10698 | if (!T.isNull()) |
10699 | Diag(IILoc, diag::err_dependent_deduced_tst) |
10700 | << (int)getTemplateNameKindForDiagnostics(TemplateName(TD)) << T; |
10701 | else |
10702 | Diag(IILoc, diag::err_deduced_tst) |
10703 | << (int)getTemplateNameKindForDiagnostics(TemplateName(TD)); |
10704 | Diag(TD->getLocation(), diag::note_template_decl_here); |
10705 | return QualType(); |
10706 | } |
10707 | return Context.getElaboratedType( |
10708 | Keyword, QualifierLoc.getNestedNameSpecifier(), |
10709 | Context.getDeducedTemplateSpecializationType(TemplateName(TD), |
10710 | QualType(), false)); |
10711 | } |
10712 | } |
10713 | |
10714 | DiagID = Ctx ? diag::err_typename_nested_not_type |
10715 | : diag::err_typename_not_type; |
10716 | Referenced = Result.getFoundDecl(); |
10717 | break; |
10718 | |
10719 | case LookupResult::FoundOverloaded: |
10720 | DiagID = Ctx ? diag::err_typename_nested_not_type |
10721 | : diag::err_typename_not_type; |
10722 | Referenced = *Result.begin(); |
10723 | break; |
10724 | |
10725 | case LookupResult::Ambiguous: |
10726 | return QualType(); |
10727 | } |
10728 | |
10729 | // If we get here, it's because name lookup did not find a |
10730 | // type. Emit an appropriate diagnostic and return an error. |
10731 | SourceRange FullRange(KeywordLoc.isValid() ? KeywordLoc : SS.getBeginLoc(), |
10732 | IILoc); |
10733 | if (Ctx) |
10734 | Diag(IILoc, DiagID) << FullRange << Name << Ctx; |
10735 | else |
10736 | Diag(IILoc, DiagID) << FullRange << Name; |
10737 | if (Referenced) |
10738 | Diag(Referenced->getLocation(), |
10739 | Ctx ? diag::note_typename_member_refers_here |
10740 | : diag::note_typename_refers_here) |
10741 | << Name; |
10742 | return QualType(); |
10743 | } |
10744 | |
10745 | namespace { |
10746 | // See Sema::RebuildTypeInCurrentInstantiation |
10747 | class CurrentInstantiationRebuilder |
10748 | : public TreeTransform<CurrentInstantiationRebuilder> { |
10749 | SourceLocation Loc; |
10750 | DeclarationName Entity; |
10751 | |
10752 | public: |
10753 | typedef TreeTransform<CurrentInstantiationRebuilder> inherited; |
10754 | |
10755 | CurrentInstantiationRebuilder(Sema &SemaRef, |
10756 | SourceLocation Loc, |
10757 | DeclarationName Entity) |
10758 | : TreeTransform<CurrentInstantiationRebuilder>(SemaRef), |
10759 | Loc(Loc), Entity(Entity) { } |
10760 | |
10761 | /// Determine whether the given type \p T has already been |
10762 | /// transformed. |
10763 | /// |
10764 | /// For the purposes of type reconstruction, a type has already been |
10765 | /// transformed if it is NULL or if it is not dependent. |
10766 | bool AlreadyTransformed(QualType T) { |
10767 | return T.isNull() || !T->isInstantiationDependentType(); |
10768 | } |
10769 | |
10770 | /// Returns the location of the entity whose type is being |
10771 | /// rebuilt. |
10772 | SourceLocation getBaseLocation() { return Loc; } |
10773 | |
10774 | /// Returns the name of the entity whose type is being rebuilt. |
10775 | DeclarationName getBaseEntity() { return Entity; } |
10776 | |
10777 | /// Sets the "base" location and entity when that |
10778 | /// information is known based on another transformation. |
10779 | void setBase(SourceLocation Loc, DeclarationName Entity) { |
10780 | this->Loc = Loc; |
10781 | this->Entity = Entity; |
10782 | } |
10783 | |
10784 | ExprResult TransformLambdaExpr(LambdaExpr *E) { |
10785 | // Lambdas never need to be transformed. |
10786 | return E; |
10787 | } |
10788 | }; |
10789 | } // end anonymous namespace |
10790 | |
10791 | /// Rebuilds a type within the context of the current instantiation. |
10792 | /// |
10793 | /// The type \p T is part of the type of an out-of-line member definition of |
10794 | /// a class template (or class template partial specialization) that was parsed |
10795 | /// and constructed before we entered the scope of the class template (or |
10796 | /// partial specialization thereof). This routine will rebuild that type now |
10797 | /// that we have entered the declarator's scope, which may produce different |
10798 | /// canonical types, e.g., |
10799 | /// |
10800 | /// \code |
10801 | /// template<typename T> |
10802 | /// struct X { |
10803 | /// typedef T* pointer; |
10804 | /// pointer data(); |
10805 | /// }; |
10806 | /// |
10807 | /// template<typename T> |
10808 | /// typename X<T>::pointer X<T>::data() { ... } |
10809 | /// \endcode |
10810 | /// |
10811 | /// Here, the type "typename X<T>::pointer" will be created as a DependentNameType, |
10812 | /// since we do not know that we can look into X<T> when we parsed the type. |
10813 | /// This function will rebuild the type, performing the lookup of "pointer" |
10814 | /// in X<T> and returning an ElaboratedType whose canonical type is the same |
10815 | /// as the canonical type of T*, allowing the return types of the out-of-line |
10816 | /// definition and the declaration to match. |
10817 | TypeSourceInfo *Sema::RebuildTypeInCurrentInstantiation(TypeSourceInfo *T, |
10818 | SourceLocation Loc, |
10819 | DeclarationName Name) { |
10820 | if (!T || !T->getType()->isInstantiationDependentType()) |
10821 | return T; |
10822 | |
10823 | CurrentInstantiationRebuilder Rebuilder(*this, Loc, Name); |
10824 | return Rebuilder.TransformType(T); |
10825 | } |
10826 | |
10827 | ExprResult Sema::RebuildExprInCurrentInstantiation(Expr *E) { |
10828 | CurrentInstantiationRebuilder Rebuilder(*this, E->getExprLoc(), |
10829 | DeclarationName()); |
10830 | return Rebuilder.TransformExpr(E); |
10831 | } |
10832 | |
10833 | bool Sema::RebuildNestedNameSpecifierInCurrentInstantiation(CXXScopeSpec &SS) { |
10834 | if (SS.isInvalid()) |
10835 | return true; |
10836 | |
10837 | NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); |
10838 | CurrentInstantiationRebuilder Rebuilder(*this, SS.getRange().getBegin(), |
10839 | DeclarationName()); |
10840 | NestedNameSpecifierLoc Rebuilt |
10841 | = Rebuilder.TransformNestedNameSpecifierLoc(QualifierLoc); |
10842 | if (!Rebuilt) |
10843 | return true; |
10844 | |
10845 | SS.Adopt(Rebuilt); |
10846 | return false; |
10847 | } |
10848 | |
10849 | /// Rebuild the template parameters now that we know we're in a current |
10850 | /// instantiation. |
10851 | bool Sema::RebuildTemplateParamsInCurrentInstantiation( |
10852 | TemplateParameterList *Params) { |
10853 | for (unsigned I = 0, N = Params->size(); I != N; ++I) { |
10854 | Decl *Param = Params->getParam(I); |
10855 | |
10856 | // There is nothing to rebuild in a type parameter. |
10857 | if (isa<TemplateTypeParmDecl>(Param)) |
10858 | continue; |
10859 | |
10860 | // Rebuild the template parameter list of a template template parameter. |
10861 | if (TemplateTemplateParmDecl *TTP |
10862 | = dyn_cast<TemplateTemplateParmDecl>(Param)) { |
10863 | if (RebuildTemplateParamsInCurrentInstantiation( |
10864 | TTP->getTemplateParameters())) |
10865 | return true; |
10866 | |
10867 | continue; |
10868 | } |
10869 | |
10870 | // Rebuild the type of a non-type template parameter. |
10871 | NonTypeTemplateParmDecl *NTTP = cast<NonTypeTemplateParmDecl>(Param); |
10872 | TypeSourceInfo *NewTSI |
10873 | = RebuildTypeInCurrentInstantiation(NTTP->getTypeSourceInfo(), |
10874 | NTTP->getLocation(), |
10875 | NTTP->getDeclName()); |
10876 | if (!NewTSI) |
10877 | return true; |
10878 | |
10879 | if (NewTSI->getType()->isUndeducedType()) { |
10880 | // C++17 [temp.dep.expr]p3: |
10881 | // An id-expression is type-dependent if it contains |
10882 | // - an identifier associated by name lookup with a non-type |
10883 | // template-parameter declared with a type that contains a |
10884 | // placeholder type (7.1.7.4), |
10885 | NewTSI = SubstAutoTypeSourceInfo(NewTSI, Context.DependentTy); |
10886 | } |
10887 | |
10888 | if (NewTSI != NTTP->getTypeSourceInfo()) { |
10889 | NTTP->setTypeSourceInfo(NewTSI); |
10890 | NTTP->setType(NewTSI->getType()); |
10891 | } |
10892 | } |
10893 | |
10894 | return false; |
10895 | } |
10896 | |
10897 | /// Produces a formatted string that describes the binding of |
10898 | /// template parameters to template arguments. |
10899 | std::string |
10900 | Sema::getTemplateArgumentBindingsText(const TemplateParameterList *Params, |
10901 | const TemplateArgumentList &Args) { |
10902 | return getTemplateArgumentBindingsText(Params, Args.data(), Args.size()); |
10903 | } |
10904 | |
10905 | std::string |
10906 | Sema::getTemplateArgumentBindingsText(const TemplateParameterList *Params, |
10907 | const TemplateArgument *Args, |
10908 | unsigned NumArgs) { |
10909 | SmallString<128> Str; |
10910 | llvm::raw_svector_ostream Out(Str); |
10911 | |
10912 | if (!Params || Params->size() == 0 || NumArgs == 0) |
10913 | return std::string(); |
10914 | |
10915 | for (unsigned I = 0, N = Params->size(); I != N; ++I) { |
10916 | if (I >= NumArgs) |
10917 | break; |
10918 | |
10919 | if (I == 0) |
10920 | Out << "[with "; |
10921 | else |
10922 | Out << ", "; |
10923 | |
10924 | if (const IdentifierInfo *Id = Params->getParam(I)->getIdentifier()) { |
10925 | Out << Id->getName(); |
10926 | } else { |
10927 | Out << '$' << I; |
10928 | } |
10929 | |
10930 | Out << " = "; |
10931 | Args[I].print( |
10932 | getPrintingPolicy(), Out, |
10933 | TemplateParameterList::shouldIncludeTypeForArgument(Params, I)); |
10934 | } |
10935 | |
10936 | Out << ']'; |
10937 | return std::string(Out.str()); |
10938 | } |
10939 | |
10940 | void Sema::MarkAsLateParsedTemplate(FunctionDecl *FD, Decl *FnD, |
10941 | CachedTokens &Toks) { |
10942 | if (!FD) |
10943 | return; |
10944 | |
10945 | auto LPT = std::make_unique<LateParsedTemplate>(); |
10946 | |
10947 | // Take tokens to avoid allocations |
10948 | LPT->Toks.swap(Toks); |
10949 | LPT->D = FnD; |
10950 | LateParsedTemplateMap.insert(std::make_pair(FD, std::move(LPT))); |
10951 | |
10952 | FD->setLateTemplateParsed(true); |
10953 | } |
10954 | |
10955 | void Sema::UnmarkAsLateParsedTemplate(FunctionDecl *FD) { |
10956 | if (!FD) |
10957 | return; |
10958 | FD->setLateTemplateParsed(false); |
10959 | } |
10960 | |
10961 | bool Sema::IsInsideALocalClassWithinATemplateFunction() { |
10962 | DeclContext *DC = CurContext; |
10963 | |
10964 | while (DC) { |
10965 | if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(CurContext)) { |
10966 | const FunctionDecl *FD = RD->isLocalClass(); |
10967 | return (FD && FD->getTemplatedKind() != FunctionDecl::TK_NonTemplate); |
10968 | } else if (DC->isTranslationUnit() || DC->isNamespace()) |
10969 | return false; |
10970 | |
10971 | DC = DC->getParent(); |
10972 | } |
10973 | return false; |
10974 | } |
10975 | |
10976 | namespace { |
10977 | /// Walk the path from which a declaration was instantiated, and check |
10978 | /// that every explicit specialization along that path is visible. This enforces |
10979 | /// C++ [temp.expl.spec]/6: |
10980 | /// |
10981 | /// If a template, a member template or a member of a class template is |
10982 | /// explicitly specialized then that specialization shall be declared before |
10983 | /// the first use of that specialization that would cause an implicit |
10984 | /// instantiation to take place, in every translation unit in which such a |
10985 | /// use occurs; no diagnostic is required. |
10986 | /// |
10987 | /// and also C++ [temp.class.spec]/1: |
10988 | /// |
10989 | /// A partial specialization shall be declared before the first use of a |
10990 | /// class template specialization that would make use of the partial |
10991 | /// specialization as the result of an implicit or explicit instantiation |
10992 | /// in every translation unit in which such a use occurs; no diagnostic is |
10993 | /// required. |
10994 | class ExplicitSpecializationVisibilityChecker { |
10995 | Sema &S; |
10996 | SourceLocation Loc; |
10997 | llvm::SmallVector<Module *, 8> Modules; |
10998 | |
10999 | public: |
11000 | ExplicitSpecializationVisibilityChecker(Sema &S, SourceLocation Loc) |
11001 | : S(S), Loc(Loc) {} |
11002 | |
11003 | void check(NamedDecl *ND) { |
11004 | if (auto *FD = dyn_cast<FunctionDecl>(ND)) |
11005 | return checkImpl(FD); |
11006 | if (auto *RD = dyn_cast<CXXRecordDecl>(ND)) |
11007 | return checkImpl(RD); |
11008 | if (auto *VD = dyn_cast<VarDecl>(ND)) |
11009 | return checkImpl(VD); |
11010 | if (auto *ED = dyn_cast<EnumDecl>(ND)) |
11011 | return checkImpl(ED); |
11012 | } |
11013 | |
11014 | private: |
11015 | void diagnose(NamedDecl *D, bool IsPartialSpec) { |
11016 | auto Kind = IsPartialSpec ? Sema::MissingImportKind::PartialSpecialization |
11017 | : Sema::MissingImportKind::ExplicitSpecialization; |
11018 | const bool Recover = true; |
11019 | |
11020 | // If we got a custom set of modules (because only a subset of the |
11021 | // declarations are interesting), use them, otherwise let |
11022 | // diagnoseMissingImport intelligently pick some. |
11023 | if (Modules.empty()) |
11024 | S.diagnoseMissingImport(Loc, D, Kind, Recover); |
11025 | else |
11026 | S.diagnoseMissingImport(Loc, D, D->getLocation(), Modules, Kind, Recover); |
11027 | } |
11028 | |
11029 | // Check a specific declaration. There are three problematic cases: |
11030 | // |
11031 | // 1) The declaration is an explicit specialization of a template |
11032 | // specialization. |
11033 | // 2) The declaration is an explicit specialization of a member of an |
11034 | // templated class. |
11035 | // 3) The declaration is an instantiation of a template, and that template |
11036 | // is an explicit specialization of a member of a templated class. |
11037 | // |
11038 | // We don't need to go any deeper than that, as the instantiation of the |
11039 | // surrounding class / etc is not triggered by whatever triggered this |
11040 | // instantiation, and thus should be checked elsewhere. |
11041 | template<typename SpecDecl> |
11042 | void checkImpl(SpecDecl *Spec) { |
11043 | bool IsHiddenExplicitSpecialization = false; |
11044 | if (Spec->getTemplateSpecializationKind() == TSK_ExplicitSpecialization) { |
11045 | IsHiddenExplicitSpecialization = |
11046 | Spec->getMemberSpecializationInfo() |
11047 | ? !S.hasVisibleMemberSpecialization(Spec, &Modules) |
11048 | : !S.hasVisibleExplicitSpecialization(Spec, &Modules); |
11049 | } else { |
11050 | checkInstantiated(Spec); |
11051 | } |
11052 | |
11053 | if (IsHiddenExplicitSpecialization) |
11054 | diagnose(Spec->getMostRecentDecl(), false); |
11055 | } |
11056 | |
11057 | void checkInstantiated(FunctionDecl *FD) { |
11058 | if (auto *TD = FD->getPrimaryTemplate()) |
11059 | checkTemplate(TD); |
11060 | } |
11061 | |
11062 | void checkInstantiated(CXXRecordDecl *RD) { |
11063 | auto *SD = dyn_cast<ClassTemplateSpecializationDecl>(RD); |
11064 | if (!SD) |
11065 | return; |
11066 | |
11067 | auto From = SD->getSpecializedTemplateOrPartial(); |
11068 | if (auto *TD = From.dyn_cast<ClassTemplateDecl *>()) |
11069 | checkTemplate(TD); |
11070 | else if (auto *TD = |
11071 | From.dyn_cast<ClassTemplatePartialSpecializationDecl *>()) { |
11072 | if (!S.hasVisibleDeclaration(TD)) |
11073 | diagnose(TD, true); |
11074 | checkTemplate(TD); |
11075 | } |
11076 | } |
11077 | |
11078 | void checkInstantiated(VarDecl *RD) { |
11079 | auto *SD = dyn_cast<VarTemplateSpecializationDecl>(RD); |
11080 | if (!SD) |
11081 | return; |
11082 | |
11083 | auto From = SD->getSpecializedTemplateOrPartial(); |
11084 | if (auto *TD = From.dyn_cast<VarTemplateDecl *>()) |
11085 | checkTemplate(TD); |
11086 | else if (auto *TD = |
11087 | From.dyn_cast<VarTemplatePartialSpecializationDecl *>()) { |
11088 | if (!S.hasVisibleDeclaration(TD)) |
11089 | diagnose(TD, true); |
11090 | checkTemplate(TD); |
11091 | } |
11092 | } |
11093 | |
11094 | void checkInstantiated(EnumDecl *FD) {} |
11095 | |
11096 | template<typename TemplDecl> |
11097 | void checkTemplate(TemplDecl *TD) { |
11098 | if (TD->isMemberSpecialization()) { |
11099 | if (!S.hasVisibleMemberSpecialization(TD, &Modules)) |
11100 | diagnose(TD->getMostRecentDecl(), false); |
11101 | } |
11102 | } |
11103 | }; |
11104 | } // end anonymous namespace |
11105 | |
11106 | void Sema::checkSpecializationVisibility(SourceLocation Loc, NamedDecl *Spec) { |
11107 | if (!getLangOpts().Modules) |
11108 | return; |
11109 | |
11110 | ExplicitSpecializationVisibilityChecker(*this, Loc).check(Spec); |
11111 | } |