/usr/src/gnu/usr.bin/clang/libclangAST/../../../llvm/clang/lib/AST/Decl.cpp

Bug Summary

File:	src/gnu/usr.bin/clang/libclangAST/../../../llvm/clang/lib/AST/Decl.cpp
Warning:	line 3886, column 5 Storage provided to placement new is only 0 bytes, whereas the allocated type requires 32 bytes

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name Decl.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model static -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/gnu/usr.bin/clang/libclangAST/obj -resource-dir /usr/local/lib/clang/13.0.0 -I /usr/src/gnu/usr.bin/clang/libclangAST/obj/../include/clang/AST -I /usr/src/gnu/usr.bin/clang/libclangAST/../../../llvm/clang/include -I /usr/src/gnu/usr.bin/clang/libclangAST/../../../llvm/llvm/include -I /usr/src/gnu/usr.bin/clang/libclangAST/../include -I /usr/src/gnu/usr.bin/clang/libclangAST/obj -I /usr/src/gnu/usr.bin/clang/libclangAST/obj/../include -D NDEBUG -D __STDC_LIMIT_MACROS -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D LLVM_PREFIX="/usr" -internal-isystem /usr/include/c++/v1 -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/usr/src/gnu/usr.bin/clang/libclangAST/obj -ferror-limit 19 -fvisibility-inlines-hidden -fwrapv -stack-protector 2 -fno-rtti -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c++ /usr/src/gnu/usr.bin/clang/libclangAST/../../../llvm/clang/lib/AST/Decl.cpp

/usr/src/gnu/usr.bin/clang/libclangAST/../../../llvm/clang/lib/AST/Decl.cpp

→

1//===- Decl.cpp - Declaration AST Node Implementation ---------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements the Decl subclasses.
10//
11//===----------------------------------------------------------------------===//

13#include "clang/AST/Decl.h"
14#include "Linkage.h"
15#include "clang/AST/ASTContext.h"
16#include "clang/AST/ASTDiagnostic.h"
17#include "clang/AST/ASTLambda.h"
18#include "clang/AST/ASTMutationListener.h"
19#include "clang/AST/Attr.h"
20#include "clang/AST/CanonicalType.h"
21#include "clang/AST/DeclBase.h"
22#include "clang/AST/DeclCXX.h"
23#include "clang/AST/DeclObjC.h"
24#include "clang/AST/DeclOpenMP.h"
25#include "clang/AST/DeclTemplate.h"
26#include "clang/AST/DeclarationName.h"
27#include "clang/AST/Expr.h"
28#include "clang/AST/ExprCXX.h"
29#include "clang/AST/ExternalASTSource.h"
30#include "clang/AST/ODRHash.h"
31#include "clang/AST/PrettyDeclStackTrace.h"
32#include "clang/AST/PrettyPrinter.h"
33#include "clang/AST/Redeclarable.h"
34#include "clang/AST/Stmt.h"
35#include "clang/AST/TemplateBase.h"
36#include "clang/AST/Type.h"
37#include "clang/AST/TypeLoc.h"
38#include "clang/Basic/Builtins.h"
39#include "clang/Basic/IdentifierTable.h"
40#include "clang/Basic/LLVM.h"
41#include "clang/Basic/LangOptions.h"
42#include "clang/Basic/Linkage.h"
43#include "clang/Basic/Module.h"
44#include "clang/Basic/NoSanitizeList.h"
45#include "clang/Basic/PartialDiagnostic.h"
46#include "clang/Basic/Sanitizers.h"
47#include "clang/Basic/SourceLocation.h"
48#include "clang/Basic/SourceManager.h"
49#include "clang/Basic/Specifiers.h"
50#include "clang/Basic/TargetCXXABI.h"
51#include "clang/Basic/TargetInfo.h"
52#include "clang/Basic/Visibility.h"
53#include "llvm/ADT/APSInt.h"
54#include "llvm/ADT/ArrayRef.h"
55#include "llvm/ADT/None.h"
56#include "llvm/ADT/Optional.h"
57#include "llvm/ADT/STLExtras.h"
58#include "llvm/ADT/SmallVector.h"
59#include "llvm/ADT/StringRef.h"
60#include "llvm/ADT/StringSwitch.h"
61#include "llvm/ADT/Triple.h"
62#include "llvm/Support/Casting.h"
63#include "llvm/Support/ErrorHandling.h"
64#include "llvm/Support/raw_ostream.h"
65#include <algorithm>
66#include <cassert>
67#include <cstddef>
68#include <cstring>
69#include <memory>
70#include <string>
71#include <tuple>
72#include <type_traits>

74using namespace clang;

76Decl *clang::getPrimaryMergedDecl(Decl *D) {
return D->getASTContext().getPrimaryMergedDecl(D);
78}

80void PrettyDeclStackTraceEntry::print(raw_ostream &OS) const {
SourceLocation Loc = this->Loc;
if (!Loc.isValid() && TheDecl) Loc = TheDecl->getLocation();
if (Loc.isValid()) {
  Loc.print(OS, Context.getSourceManager());
  OS << ": ";
}
OS << Message;

if (auto *ND = dyn_cast_or_null<NamedDecl>(TheDecl)) {
  OS << " '";
  ND->getNameForDiagnostic(OS, Context.getPrintingPolicy(), true);
  OS << "'";
}

OS << '\n';
96}

98// Defined here so that it can be inlined into its direct callers.
99bool Decl::isOutOfLine() const {
return !getLexicalDeclContext()->Equals(getDeclContext());
101}

103TranslationUnitDecl::TranslationUnitDecl(ASTContext &ctx)
  : Decl(TranslationUnit, nullptr, SourceLocation()),
    DeclContext(TranslationUnit), redeclarable_base(ctx), Ctx(ctx) {}

107//===----------------------------------------------------------------------===//
108// NamedDecl Implementation
109//===----------------------------------------------------------------------===//

111// Visibility rules aren't rigorously externally specified, but here
112// are the basic principles behind what we implement:
113//
114// 1. An explicit visibility attribute is generally a direct expression
115// of the user's intent and should be honored.  Only the innermost
116// visibility attribute applies.  If no visibility attribute applies,
117// global visibility settings are considered.
118//
119// 2. There is one caveat to the above: on or in a template pattern,
120// an explicit visibility attribute is just a default rule, and
121// visibility can be decreased by the visibility of template
122// arguments.  But this, too, has an exception: an attribute on an
123// explicit specialization or instantiation causes all the visibility
124// restrictions of the template arguments to be ignored.
125//
126// 3. A variable that does not otherwise have explicit visibility can
127// be restricted by the visibility of its type.
128//
129// 4. A visibility restriction is explicit if it comes from an
130// attribute (or something like it), not a global visibility setting.
131// When emitting a reference to an external symbol, visibility
132// restrictions are ignored unless they are explicit.
133//
134// 5. When computing the visibility of a non-type, including a
135// non-type member of a class, only non-type visibility restrictions
136// are considered: the 'visibility' attribute, global value-visibility
137// settings, and a few special cases like __private_extern.
138//
139// 6. When computing the visibility of a type, including a type member
140// of a class, only type visibility restrictions are considered:
141// the 'type_visibility' attribute and global type-visibility settings.
142// However, a 'visibility' attribute counts as a 'type_visibility'
143// attribute on any declaration that only has the former.
144//
145// The visibility of a "secondary" entity, like a template argument,
146// is computed using the kind of that entity, not the kind of the
147// primary entity for which we are computing visibility.  For example,
148// the visibility of a specialization of either of these templates:
149//   template <class T, bool (&compare)(T, X)> bool has_match(list<T>, X);
150//   template <class T, bool (&compare)(T, X)> class matcher;
151// is restricted according to the type visibility of the argument 'T',
152// the type visibility of 'bool(&)(T,X)', and the value visibility of
153// the argument function 'compare'.  That 'has_match' is a value
154// and 'matcher' is a type only matters when looking for attributes
155// and settings from the immediate context.

157/// Does this computation kind permit us to consider additional
158/// visibility settings from attributes and the like?
159static bool hasExplicitVisibilityAlready(LVComputationKind computation) {
return computation.IgnoreExplicitVisibility;
161}

163/// Given an LVComputationKind, return one of the same type/value sort
164/// that records that it already has explicit visibility.
165static LVComputationKind
166withExplicitVisibilityAlready(LVComputationKind Kind) {
Kind.IgnoreExplicitVisibility = true;
return Kind;
169}

171static Optional<Visibility> getExplicitVisibility(const NamedDecl *D,
                                                LVComputationKind kind) {
assert(!kind.IgnoreExplicitVisibility &&((void)0)
       "asking for explicit visibility when we shouldn't be")((void)0);
return D->getExplicitVisibility(kind.getExplicitVisibilityKind());
176}

178/// Is the given declaration a "type" or a "value" for the purposes of
179/// visibility computation?
180static bool usesTypeVisibility(const NamedDecl *D) {
return isa<TypeDecl>(D) ||
       isa<ClassTemplateDecl>(D) ||
       isa<ObjCInterfaceDecl>(D);
184}

186/// Does the given declaration have member specialization information,
187/// and if so, is it an explicit specialization?
188template <class T> static typename
189std::enable_if<!std::is_base_of<RedeclarableTemplateDecl, T>::value, bool>::type
190isExplicitMemberSpecialization(const T *D) {
if (const MemberSpecializationInfo *member =
      D->getMemberSpecializationInfo()) {
  return member->isExplicitSpecialization();
}
return false;
196}

198/// For templates, this question is easier: a member template can't be
199/// explicitly instantiated, so there's a single bit indicating whether
200/// or not this is an explicit member specialization.
201static bool isExplicitMemberSpecialization(const RedeclarableTemplateDecl *D) {
return D->isMemberSpecialization();
203}

205/// Given a visibility attribute, return the explicit visibility
206/// associated with it.
207template <class T>
208static Visibility getVisibilityFromAttr(const T *attr) {
switch (attr->getVisibility()) {
case T::Default:
  return DefaultVisibility;
case T::Hidden:
  return HiddenVisibility;
case T::Protected:
  return ProtectedVisibility;
}
llvm_unreachable("bad visibility kind")__builtin_unreachable();
218}

220/// Return the explicit visibility of the given declaration.
221static Optional<Visibility> getVisibilityOf(const NamedDecl *D,
                                  NamedDecl::ExplicitVisibilityKind kind) {
// If we're ultimately computing the visibility of a type, look for
// a 'type_visibility' attribute before looking for 'visibility'.
if (kind == NamedDecl::VisibilityForType) {
  if (const auto *A = D->getAttr<TypeVisibilityAttr>()) {
    return getVisibilityFromAttr(A);
  }
}

// If this declaration has an explicit visibility attribute, use it.
if (const auto *A = D->getAttr<VisibilityAttr>()) {
  return getVisibilityFromAttr(A);
}

return None;
237}

239LinkageInfo LinkageComputer::getLVForType(const Type &T,
                                        LVComputationKind computation) {
if (computation.IgnoreAllVisibility)
  return LinkageInfo(T.getLinkage(), DefaultVisibility, true);
return getTypeLinkageAndVisibility(&T);
244}

246/// Get the most restrictive linkage for the types in the given
247/// template parameter list.  For visibility purposes, template
248/// parameters are part of the signature of a template.
249LinkageInfo LinkageComputer::getLVForTemplateParameterList(
  const TemplateParameterList *Params, LVComputationKind computation) {
LinkageInfo LV;
for (const NamedDecl *P : *Params) {
  // Template type parameters are the most common and never
  // contribute to visibility, pack or not.
  if (isa<TemplateTypeParmDecl>(P))
    continue;

  // Non-type template parameters can be restricted by the value type, e.g.
  //   template <enum X> class A { ... };
  // We have to be careful here, though, because we can be dealing with
  // dependent types.
  if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) {
    // Handle the non-pack case first.
    if (!NTTP->isExpandedParameterPack()) {
      if (!NTTP->getType()->isDependentType()) {
        LV.merge(getLVForType(*NTTP->getType(), computation));
      }
      continue;
    }

    // Look at all the types in an expanded pack.
    for (unsigned i = 0, n = NTTP->getNumExpansionTypes(); i != n; ++i) {
      QualType type = NTTP->getExpansionType(i);
      if (!type->isDependentType())
        LV.merge(getTypeLinkageAndVisibility(type));
    }
    continue;
  }

  // Template template parameters can be restricted by their
  // template parameters, recursively.
  const auto *TTP = cast<TemplateTemplateParmDecl>(P);

  // Handle the non-pack case first.
  if (!TTP->isExpandedParameterPack()) {
    LV.merge(getLVForTemplateParameterList(TTP->getTemplateParameters(),
                                           computation));
    continue;
  }

  // Look at all expansions in an expanded pack.
  for (unsigned i = 0, n = TTP->getNumExpansionTemplateParameters();
         i != n; ++i) {
    LV.merge(getLVForTemplateParameterList(
        TTP->getExpansionTemplateParameters(i), computation));
  }
}

return LV;
300}

302static const Decl *getOutermostFuncOrBlockContext(const Decl *D) {
const Decl *Ret = nullptr;
const DeclContext *DC = D->getDeclContext();
while (DC->getDeclKind() != Decl::TranslationUnit) {
  if (isa<FunctionDecl>(DC) || isa<BlockDecl>(DC))
    Ret = cast<Decl>(DC);
  DC = DC->getParent();
}
return Ret;
311}

313/// Get the most restrictive linkage for the types and
314/// declarations in the given template argument list.
315///
316/// Note that we don't take an LVComputationKind because we always
317/// want to honor the visibility of template arguments in the same way.
318LinkageInfo
319LinkageComputer::getLVForTemplateArgumentList(ArrayRef<TemplateArgument> Args,
                                            LVComputationKind computation) {
LinkageInfo LV;

for (const TemplateArgument &Arg : Args) {
  switch (Arg.getKind()) {
  case TemplateArgument::Null:
  case TemplateArgument::Integral:
  case TemplateArgument::Expression:
    continue;

  case TemplateArgument::Type:
    LV.merge(getLVForType(*Arg.getAsType(), computation));
    continue;

  case TemplateArgument::Declaration: {
    const NamedDecl *ND = Arg.getAsDecl();
    assert(!usesTypeVisibility(ND))((void)0);
    LV.merge(getLVForDecl(ND, computation));
    continue;
  }

  case TemplateArgument::NullPtr:
    LV.merge(getTypeLinkageAndVisibility(Arg.getNullPtrType()));
    continue;

  case TemplateArgument::Template:
  case TemplateArgument::TemplateExpansion:
    if (TemplateDecl *Template =
            Arg.getAsTemplateOrTemplatePattern().getAsTemplateDecl())
      LV.merge(getLVForDecl(Template, computation));
    continue;

  case TemplateArgument::Pack:
    LV.merge(getLVForTemplateArgumentList(Arg.getPackAsArray(), computation));
    continue;
  }
  llvm_unreachable("bad template argument kind")__builtin_unreachable();
}

return LV;
360}

362LinkageInfo
363LinkageComputer::getLVForTemplateArgumentList(const TemplateArgumentList &TArgs,
                                            LVComputationKind computation) {
return getLVForTemplateArgumentList(TArgs.asArray(), computation);
366}

368static bool shouldConsiderTemplateVisibility(const FunctionDecl *fn,
                      const FunctionTemplateSpecializationInfo *specInfo) {
// Include visibility from the template parameters and arguments
// only if this is not an explicit instantiation or specialization
// with direct explicit visibility.  (Implicit instantiations won't
// have a direct attribute.)
if (!specInfo->isExplicitInstantiationOrSpecialization())
  return true;

return !fn->hasAttr<VisibilityAttr>();
378}

380/// Merge in template-related linkage and visibility for the given
381/// function template specialization.
382///
383/// We don't need a computation kind here because we can assume
384/// LVForValue.
385///
386/// \param[out] LV the computation to use for the parent
387void LinkageComputer::mergeTemplateLV(
  LinkageInfo &LV, const FunctionDecl *fn,
  const FunctionTemplateSpecializationInfo *specInfo,
  LVComputationKind computation) {
bool considerVisibility =
  shouldConsiderTemplateVisibility(fn, specInfo);

// Merge information from the template parameters.
FunctionTemplateDecl *temp = specInfo->getTemplate();
LinkageInfo tempLV =
  getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
LV.mergeMaybeWithVisibility(tempLV, considerVisibility);

// Merge information from the template arguments.
const TemplateArgumentList &templateArgs = *specInfo->TemplateArguments;
LinkageInfo argsLV = getLVForTemplateArgumentList(templateArgs, computation);
LV.mergeMaybeWithVisibility(argsLV, considerVisibility);
404}

406/// Does the given declaration have a direct visibility attribute
407/// that would match the given rules?
408static bool hasDirectVisibilityAttribute(const NamedDecl *D,
                                       LVComputationKind computation) {
if (computation.IgnoreAllVisibility)
  return false;

return (computation.isTypeVisibility() && D->hasAttr<TypeVisibilityAttr>()) ||
       D->hasAttr<VisibilityAttr>();
415}

417/// Should we consider visibility associated with the template
418/// arguments and parameters of the given class template specialization?
419static bool shouldConsiderTemplateVisibility(
                               const ClassTemplateSpecializationDecl *spec,
                               LVComputationKind computation) {
// Include visibility from the template parameters and arguments
// only if this is not an explicit instantiation or specialization
// with direct explicit visibility (and note that implicit
// instantiations won't have a direct attribute).
//
// Furthermore, we want to ignore template parameters and arguments
// for an explicit specialization when computing the visibility of a
// member thereof with explicit visibility.
//
// This is a bit complex; let's unpack it.
//
// An explicit class specialization is an independent, top-level
// declaration.  As such, if it or any of its members has an
// explicit visibility attribute, that must directly express the
// user's intent, and we should honor it.  The same logic applies to
// an explicit instantiation of a member of such a thing.

// Fast path: if this is not an explicit instantiation or
// specialization, we always want to consider template-related
// visibility restrictions.
if (!spec->isExplicitInstantiationOrSpecialization())
  return true;

// This is the 'member thereof' check.
if (spec->isExplicitSpecialization() &&
    hasExplicitVisibilityAlready(computation))
  return false;

return !hasDirectVisibilityAttribute(spec, computation);
451}

453/// Merge in template-related linkage and visibility for the given
454/// class template specialization.
455void LinkageComputer::mergeTemplateLV(
  LinkageInfo &LV, const ClassTemplateSpecializationDecl *spec,
  LVComputationKind computation) {
bool considerVisibility = shouldConsiderTemplateVisibility(spec, computation);

// Merge information from the template parameters, but ignore
// visibility if we're only considering template arguments.

ClassTemplateDecl *temp = spec->getSpecializedTemplate();
LinkageInfo tempLV =
  getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
LV.mergeMaybeWithVisibility(tempLV,
         considerVisibility && !hasExplicitVisibilityAlready(computation));

// Merge information from the template arguments.  We ignore
// template-argument visibility if we've got an explicit
// instantiation with a visibility attribute.
const TemplateArgumentList &templateArgs = spec->getTemplateArgs();
LinkageInfo argsLV = getLVForTemplateArgumentList(templateArgs, computation);
if (considerVisibility)
  LV.mergeVisibility(argsLV);
LV.mergeExternalVisibility(argsLV);
477}

479/// Should we consider visibility associated with the template
480/// arguments and parameters of the given variable template
481/// specialization? As usual, follow class template specialization
482/// logic up to initialization.
483static bool shouldConsiderTemplateVisibility(
                               const VarTemplateSpecializationDecl *spec,
                               LVComputationKind computation) {
// Include visibility from the template parameters and arguments
// only if this is not an explicit instantiation or specialization
// with direct explicit visibility (and note that implicit
// instantiations won't have a direct attribute).
if (!spec->isExplicitInstantiationOrSpecialization())
  return true;

// An explicit variable specialization is an independent, top-level
// declaration.  As such, if it has an explicit visibility attribute,
// that must directly express the user's intent, and we should honor
// it.
if (spec->isExplicitSpecialization() &&
    hasExplicitVisibilityAlready(computation))
  return false;

return !hasDirectVisibilityAttribute(spec, computation);
502}

504/// Merge in template-related linkage and visibility for the given
505/// variable template specialization. As usual, follow class template
506/// specialization logic up to initialization.
507void LinkageComputer::mergeTemplateLV(LinkageInfo &LV,
                                    const VarTemplateSpecializationDecl *spec,
                                    LVComputationKind computation) {
bool considerVisibility = shouldConsiderTemplateVisibility(spec, computation);

// Merge information from the template parameters, but ignore
// visibility if we're only considering template arguments.

VarTemplateDecl *temp = spec->getSpecializedTemplate();
LinkageInfo tempLV =
  getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
LV.mergeMaybeWithVisibility(tempLV,
         considerVisibility && !hasExplicitVisibilityAlready(computation));

// Merge information from the template arguments.  We ignore
// template-argument visibility if we've got an explicit
// instantiation with a visibility attribute.
const TemplateArgumentList &templateArgs = spec->getTemplateArgs();
LinkageInfo argsLV = getLVForTemplateArgumentList(templateArgs, computation);
if (considerVisibility)
  LV.mergeVisibility(argsLV);
LV.mergeExternalVisibility(argsLV);
529}

531static bool useInlineVisibilityHidden(const NamedDecl *D) {
// FIXME: we should warn if -fvisibility-inlines-hidden is used with c.
const LangOptions &Opts = D->getASTContext().getLangOpts();
if (!Opts.CPlusPlus || !Opts.InlineVisibilityHidden)
  return false;

const auto *FD = dyn_cast<FunctionDecl>(D);
if (!FD)
  return false;

TemplateSpecializationKind TSK = TSK_Undeclared;
if (FunctionTemplateSpecializationInfo *spec
    = FD->getTemplateSpecializationInfo()) {
  TSK = spec->getTemplateSpecializationKind();
} else if (MemberSpecializationInfo *MSI =
           FD->getMemberSpecializationInfo()) {
  TSK = MSI->getTemplateSpecializationKind();
}

const FunctionDecl *Def = nullptr;
// InlineVisibilityHidden only applies to definitions, and
// isInlined() only gives meaningful answers on definitions
// anyway.
return TSK != TSK_ExplicitInstantiationDeclaration &&
  TSK != TSK_ExplicitInstantiationDefinition &&
  FD->hasBody(Def) && Def->isInlined() && !Def->hasAttr<GNUInlineAttr>();
557}

559template <typename T> static bool isFirstInExternCContext(T *D) {
const T *First = D->getFirstDecl();
return First->isInExternCContext();
562}

564static bool isSingleLineLanguageLinkage(const Decl &D) {
if (const auto *SD = dyn_cast<LinkageSpecDecl>(D.getDeclContext()))
  if (!SD->hasBraces())
    return true;
return false;
569}

571/// Determine whether D is declared in the purview of a named module.
572static bool isInModulePurview(const NamedDecl *D) {
if (auto *M = D->getOwningModule())
  return M->isModulePurview();
return false;
576}

578static bool isExportedFromModuleInterfaceUnit(const NamedDecl *D) {
// FIXME: Handle isModulePrivate.
switch (D->getModuleOwnershipKind()) {
case Decl::ModuleOwnershipKind::Unowned:
case Decl::ModuleOwnershipKind::ModulePrivate:
  return false;
case Decl::ModuleOwnershipKind::Visible:
case Decl::ModuleOwnershipKind::VisibleWhenImported:
  return isInModulePurview(D);
}
llvm_unreachable("unexpected module ownership kind")__builtin_unreachable();
589}

591static LinkageInfo getInternalLinkageFor(const NamedDecl *D) {
// Internal linkage declarations within a module interface unit are modeled
// as "module-internal linkage", which means that they have internal linkage
// formally but can be indirectly accessed from outside the module via inline
// functions and templates defined within the module.
if (isInModulePurview(D))
  return LinkageInfo(ModuleInternalLinkage, DefaultVisibility, false);

return LinkageInfo::internal();
600}

602static LinkageInfo getExternalLinkageFor(const NamedDecl *D) {
// C++ Modules TS [basic.link]/6.8:
//   - A name declared at namespace scope that does not have internal linkage
//     by the previous rules and that is introduced by a non-exported
//     declaration has module linkage.
if (isInModulePurview(D) && !isExportedFromModuleInterfaceUnit(
                                cast<NamedDecl>(D->getCanonicalDecl())))
  return LinkageInfo(ModuleLinkage, DefaultVisibility, false);

return LinkageInfo::external();
612}

614static StorageClass getStorageClass(const Decl *D) {
if (auto *TD = dyn_cast<TemplateDecl>(D))
  D = TD->getTemplatedDecl();
if (D) {
  if (auto *VD = dyn_cast<VarDecl>(D))
    return VD->getStorageClass();
  if (auto *FD = dyn_cast<FunctionDecl>(D))
    return FD->getStorageClass();
}
return SC_None;
624}

626LinkageInfo
627LinkageComputer::getLVForNamespaceScopeDecl(const NamedDecl *D,
                                          LVComputationKind computation,
                                          bool IgnoreVarTypeLinkage) {
assert(D->getDeclContext()->getRedeclContext()->isFileContext() &&((void)0)
       "Not a name having namespace scope")((void)0);
ASTContext &Context = D->getASTContext();

// C++ [basic.link]p3:
//   A name having namespace scope (3.3.6) has internal linkage if it
//   is the name of

if (getStorageClass(D->getCanonicalDecl()) == SC_Static) {
  // - a variable, variable template, function, or function template
  //   that is explicitly declared static; or
  // (This bullet corresponds to C99 6.2.2p3.)
  return getInternalLinkageFor(D);
}

if (const auto *Var = dyn_cast<VarDecl>(D)) {
  // - a non-template variable of non-volatile const-qualified type, unless
  //   - it is explicitly declared extern, or
  //   - it is inline or exported, or
  //   - it was previously declared and the prior declaration did not have
  //     internal linkage
  // (There is no equivalent in C99.)
  if (Context.getLangOpts().CPlusPlus &&
      Var->getType().isConstQualified() &&
      !Var->getType().isVolatileQualified() &&
      !Var->isInline() &&
      !isExportedFromModuleInterfaceUnit(Var) &&
      !isa<VarTemplateSpecializationDecl>(Var) &&
      !Var->getDescribedVarTemplate()) {
    const VarDecl *PrevVar = Var->getPreviousDecl();
    if (PrevVar)
      return getLVForDecl(PrevVar, computation);

    if (Var->getStorageClass() != SC_Extern &&
        Var->getStorageClass() != SC_PrivateExtern &&
        !isSingleLineLanguageLinkage(*Var))
      return getInternalLinkageFor(Var);
  }

  for (const VarDecl *PrevVar = Var->getPreviousDecl(); PrevVar;
       PrevVar = PrevVar->getPreviousDecl()) {
    if (PrevVar->getStorageClass() == SC_PrivateExtern &&
        Var->getStorageClass() == SC_None)
      return getDeclLinkageAndVisibility(PrevVar);
    // Explicitly declared static.
    if (PrevVar->getStorageClass() == SC_Static)
      return getInternalLinkageFor(Var);
  }
} else if (const auto *IFD = dyn_cast<IndirectFieldDecl>(D)) {
  //   - a data member of an anonymous union.
  const VarDecl *VD = IFD->getVarDecl();
  assert(VD && "Expected a VarDecl in this IndirectFieldDecl!")((void)0);
  return getLVForNamespaceScopeDecl(VD, computation, IgnoreVarTypeLinkage);
}
assert(!isa<FieldDecl>(D) && "Didn't expect a FieldDecl!")((void)0);

// FIXME: This gives internal linkage to names that should have no linkage
// (those not covered by [basic.link]p6).
if (D->isInAnonymousNamespace()) {
  const auto *Var = dyn_cast<VarDecl>(D);
  const auto *Func = dyn_cast<FunctionDecl>(D);
  // FIXME: The check for extern "C" here is not justified by the standard
  // wording, but we retain it from the pre-DR1113 model to avoid breaking
  // code.
  //
  // C++11 [basic.link]p4:
  //   An unnamed namespace or a namespace declared directly or indirectly
  //   within an unnamed namespace has internal linkage.
  if ((!Var || !isFirstInExternCContext(Var)) &&
      (!Func || !isFirstInExternCContext(Func)))
    return getInternalLinkageFor(D);
}

// Set up the defaults.

// C99 6.2.2p5:
//   If the declaration of an identifier for an object has file
//   scope and no storage-class specifier, its linkage is
//   external.
LinkageInfo LV = getExternalLinkageFor(D);

if (!hasExplicitVisibilityAlready(computation)) {
  if (Optional<Visibility> Vis = getExplicitVisibility(D, computation)) {
    LV.mergeVisibility(*Vis, true);
  } else {
    // If we're declared in a namespace with a visibility attribute,
    // use that namespace's visibility, and it still counts as explicit.
    for (const DeclContext *DC = D->getDeclContext();
         !isa<TranslationUnitDecl>(DC);
         DC = DC->getParent()) {
      const auto *ND = dyn_cast<NamespaceDecl>(DC);
      if (!ND) continue;
      if (Optional<Visibility> Vis = getExplicitVisibility(ND, computation)) {
        LV.mergeVisibility(*Vis, true);
        break;
      }
    }
  }

  // Add in global settings if the above didn't give us direct visibility.
  if (!LV.isVisibilityExplicit()) {
    // Use global type/value visibility as appropriate.
    Visibility globalVisibility =
        computation.isValueVisibility()
            ? Context.getLangOpts().getValueVisibilityMode()
            : Context.getLangOpts().getTypeVisibilityMode();
    LV.mergeVisibility(globalVisibility, /*explicit*/ false);

    // If we're paying attention to global visibility, apply
    // -finline-visibility-hidden if this is an inline method.
    if (useInlineVisibilityHidden(D))
      LV.mergeVisibility(HiddenVisibility, /*visibilityExplicit=*/false);
  }
}

// C++ [basic.link]p4:

//   A name having namespace scope that has not been given internal linkage
//   above and that is the name of
//   [...bullets...]
//   has its linkage determined as follows:
//     - if the enclosing namespace has internal linkage, the name has
//       internal linkage; [handled above]
//     - otherwise, if the declaration of the name is attached to a named
//       module and is not exported, the name has module linkage;
//     - otherwise, the name has external linkage.
// LV is currently set up to handle the last two bullets.
//
//   The bullets are:

//     - a variable; or
if (const auto *Var = dyn_cast<VarDecl>(D)) {
  // GCC applies the following optimization to variables and static
  // data members, but not to functions:
  //
  // Modify the variable's LV by the LV of its type unless this is
  // C or extern "C".  This follows from [basic.link]p9:
  //   A type without linkage shall not be used as the type of a
  //   variable or function with external linkage unless
  //    - the entity has C language linkage, or
  //    - the entity is declared within an unnamed namespace, or
  //    - the entity is not used or is defined in the same
  //      translation unit.
  // and [basic.link]p10:
  //   ...the types specified by all declarations referring to a
  //   given variable or function shall be identical...
  // C does not have an equivalent rule.
  //
  // Ignore this if we've got an explicit attribute;  the user
  // probably knows what they're doing.
  //
  // Note that we don't want to make the variable non-external
  // because of this, but unique-external linkage suits us.
  if (Context.getLangOpts().CPlusPlus && !isFirstInExternCContext(Var) &&
      !IgnoreVarTypeLinkage) {
    LinkageInfo TypeLV = getLVForType(*Var->getType(), computation);
    if (!isExternallyVisible(TypeLV.getLinkage()))
      return LinkageInfo::uniqueExternal();
    if (!LV.isVisibilityExplicit())
      LV.mergeVisibility(TypeLV);
  }

  if (Var->getStorageClass() == SC_PrivateExtern)
    LV.mergeVisibility(HiddenVisibility, true);

  // Note that Sema::MergeVarDecl already takes care of implementing
  // C99 6.2.2p4 and propagating the visibility attribute, so we don't have
  // to do it here.

  // As per function and class template specializations (below),
  // consider LV for the template and template arguments.  We're at file
  // scope, so we do not need to worry about nested specializations.
  if (const auto *spec = dyn_cast<VarTemplateSpecializationDecl>(Var)) {
    mergeTemplateLV(LV, spec, computation);
  }

//     - a function; or
} else if (const auto *Function = dyn_cast<FunctionDecl>(D)) {
  // In theory, we can modify the function's LV by the LV of its
  // type unless it has C linkage (see comment above about variables
  // for justification).  In practice, GCC doesn't do this, so it's
  // just too painful to make work.

  if (Function->getStorageClass() == SC_PrivateExtern)
    LV.mergeVisibility(HiddenVisibility, true);

  // Note that Sema::MergeCompatibleFunctionDecls already takes care of
  // merging storage classes and visibility attributes, so we don't have to
  // look at previous decls in here.

  // In C++, then if the type of the function uses a type with
  // unique-external linkage, it's not legally usable from outside
  // this translation unit.  However, we should use the C linkage
  // rules instead for extern "C" declarations.
  if (Context.getLangOpts().CPlusPlus && !isFirstInExternCContext(Function)) {
    // Only look at the type-as-written. Otherwise, deducing the return type
    // of a function could change its linkage.
    QualType TypeAsWritten = Function->getType();
    if (TypeSourceInfo *TSI = Function->getTypeSourceInfo())
      TypeAsWritten = TSI->getType();
    if (!isExternallyVisible(TypeAsWritten->getLinkage()))
      return LinkageInfo::uniqueExternal();
  }

  // Consider LV from the template and the template arguments.
  // We're at file scope, so we do not need to worry about nested
  // specializations.
  if (FunctionTemplateSpecializationInfo *specInfo
                             = Function->getTemplateSpecializationInfo()) {
    mergeTemplateLV(LV, Function, specInfo, computation);
  }

//     - a named class (Clause 9), or an unnamed class defined in a
//       typedef declaration in which the class has the typedef name
//       for linkage purposes (7.1.3); or
//     - a named enumeration (7.2), or an unnamed enumeration
//       defined in a typedef declaration in which the enumeration
//       has the typedef name for linkage purposes (7.1.3); or
} else if (const auto *Tag = dyn_cast<TagDecl>(D)) {
  // Unnamed tags have no linkage.
  if (!Tag->hasNameForLinkage())
    return LinkageInfo::none();

  // If this is a class template specialization, consider the
  // linkage of the template and template arguments.  We're at file
  // scope, so we do not need to worry about nested specializations.
  if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(Tag)) {
    mergeTemplateLV(LV, spec, computation);
  }

// FIXME: This is not part of the C++ standard any more.
//     - an enumerator belonging to an enumeration with external linkage; or
} else if (isa<EnumConstantDecl>(D)) {
  LinkageInfo EnumLV = getLVForDecl(cast<NamedDecl>(D->getDeclContext()),
                                    computation);
  if (!isExternalFormalLinkage(EnumLV.getLinkage()))
    return LinkageInfo::none();
  LV.merge(EnumLV);

//     - a template
} else if (const auto *temp = dyn_cast<TemplateDecl>(D)) {
  bool considerVisibility = !hasExplicitVisibilityAlready(computation);
  LinkageInfo tempLV =
    getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
  LV.mergeMaybeWithVisibility(tempLV, considerVisibility);

//     An unnamed namespace or a namespace declared directly or indirectly
//     within an unnamed namespace has internal linkage. All other namespaces
//     have external linkage.
//
// We handled names in anonymous namespaces above.
} else if (isa<NamespaceDecl>(D)) {
  return LV;

// By extension, we assign external linkage to Objective-C
// interfaces.
} else if (isa<ObjCInterfaceDecl>(D)) {
  // fallout

} else if (auto *TD = dyn_cast<TypedefNameDecl>(D)) {
  // A typedef declaration has linkage if it gives a type a name for
  // linkage purposes.
  if (!TD->getAnonDeclWithTypedefName(/*AnyRedecl*/true))
    return LinkageInfo::none();

} else if (isa<MSGuidDecl>(D)) {
  // A GUID behaves like an inline variable with external linkage. Fall
  // through.

// Everything not covered here has no linkage.
} else {
  return LinkageInfo::none();
}

// If we ended up with non-externally-visible linkage, visibility should
// always be default.
if (!isExternallyVisible(LV.getLinkage()))
  return LinkageInfo(LV.getLinkage(), DefaultVisibility, false);

// Mark the symbols as hidden when compiling for the device.
if (Context.getLangOpts().OpenMP && Context.getLangOpts().OpenMPIsDevice)
  LV.mergeVisibility(HiddenVisibility, /*newExplicit=*/false);

return LV;
914}

916LinkageInfo
917LinkageComputer::getLVForClassMember(const NamedDecl *D,
                                   LVComputationKind computation,
                                   bool IgnoreVarTypeLinkage) {
// Only certain class members have linkage.  Note that fields don't
// really have linkage, but it's convenient to say they do for the
// purposes of calculating linkage of pointer-to-data-member
// template arguments.
//
// Templates also don't officially have linkage, but since we ignore
// the C++ standard and look at template arguments when determining
// linkage and visibility of a template specialization, we might hit
// a template template argument that way. If we do, we need to
// consider its linkage.
if (!(isa<CXXMethodDecl>(D) ||
      isa<VarDecl>(D) ||
      isa<FieldDecl>(D) ||
      isa<IndirectFieldDecl>(D) ||
      isa<TagDecl>(D) ||
      isa<TemplateDecl>(D)))
  return LinkageInfo::none();

LinkageInfo LV;

// If we have an explicit visibility attribute, merge that in.
if (!hasExplicitVisibilityAlready(computation)) {
  if (Optional<Visibility> Vis = getExplicitVisibility(D, computation))
    LV.mergeVisibility(*Vis, true);
  // If we're paying attention to global visibility, apply
  // -finline-visibility-hidden if this is an inline method.
  //
  // Note that we do this before merging information about
  // the class visibility.
  if (!LV.isVisibilityExplicit() && useInlineVisibilityHidden(D))
    LV.mergeVisibility(HiddenVisibility, /*visibilityExplicit=*/false);
}

// If this class member has an explicit visibility attribute, the only
// thing that can change its visibility is the template arguments, so
// only look for them when processing the class.
LVComputationKind classComputation = computation;
if (LV.isVisibilityExplicit())
  classComputation = withExplicitVisibilityAlready(computation);

LinkageInfo classLV =
  getLVForDecl(cast<RecordDecl>(D->getDeclContext()), classComputation);
// The member has the same linkage as the class. If that's not externally
// visible, we don't need to compute anything about the linkage.
// FIXME: If we're only computing linkage, can we bail out here?
if (!isExternallyVisible(classLV.getLinkage()))
  return classLV;


// Otherwise, don't merge in classLV yet, because in certain cases
// we need to completely ignore the visibility from it.

// Specifically, if this decl exists and has an explicit attribute.
const NamedDecl *explicitSpecSuppressor = nullptr;

if (const auto *MD = dyn_cast<CXXMethodDecl>(D)) {
  // Only look at the type-as-written. Otherwise, deducing the return type
  // of a function could change its linkage.
  QualType TypeAsWritten = MD->getType();
  if (TypeSourceInfo *TSI = MD->getTypeSourceInfo())
    TypeAsWritten = TSI->getType();
  if (!isExternallyVisible(TypeAsWritten->getLinkage()))
    return LinkageInfo::uniqueExternal();

  // If this is a method template specialization, use the linkage for
  // the template parameters and arguments.
  if (FunctionTemplateSpecializationInfo *spec
         = MD->getTemplateSpecializationInfo()) {
    mergeTemplateLV(LV, MD, spec, computation);
    if (spec->isExplicitSpecialization()) {
      explicitSpecSuppressor = MD;
    } else if (isExplicitMemberSpecialization(spec->getTemplate())) {
      explicitSpecSuppressor = spec->getTemplate()->getTemplatedDecl();
    }
  } else if (isExplicitMemberSpecialization(MD)) {
    explicitSpecSuppressor = MD;
  }

} else if (const auto *RD = dyn_cast<CXXRecordDecl>(D)) {
  if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(RD)) {
    mergeTemplateLV(LV, spec, computation);
    if (spec->isExplicitSpecialization()) {
      explicitSpecSuppressor = spec;
    } else {
      const ClassTemplateDecl *temp = spec->getSpecializedTemplate();
      if (isExplicitMemberSpecialization(temp)) {
        explicitSpecSuppressor = temp->getTemplatedDecl();
      }
    }
  } else if (isExplicitMemberSpecialization(RD)) {
    explicitSpecSuppressor = RD;
  }

// Static data members.
} else if (const auto *VD = dyn_cast<VarDecl>(D)) {
  if (const auto *spec = dyn_cast<VarTemplateSpecializationDecl>(VD))
    mergeTemplateLV(LV, spec, computation);

  // Modify the variable's linkage by its type, but ignore the
  // type's visibility unless it's a definition.
  if (!IgnoreVarTypeLinkage) {
    LinkageInfo typeLV = getLVForType(*VD->getType(), computation);
    // FIXME: If the type's linkage is not externally visible, we can
    // give this static data member UniqueExternalLinkage.
    if (!LV.isVisibilityExplicit() && !classLV.isVisibilityExplicit())
      LV.mergeVisibility(typeLV);
    LV.mergeExternalVisibility(typeLV);
  }

  if (isExplicitMemberSpecialization(VD)) {
    explicitSpecSuppressor = VD;
  }

// Template members.
} else if (const auto *temp = dyn_cast<TemplateDecl>(D)) {
  bool considerVisibility =
    (!LV.isVisibilityExplicit() &&
     !classLV.isVisibilityExplicit() &&
     !hasExplicitVisibilityAlready(computation));
  LinkageInfo tempLV =
    getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
  LV.mergeMaybeWithVisibility(tempLV, considerVisibility);

  if (const auto *redeclTemp = dyn_cast<RedeclarableTemplateDecl>(temp)) {
    if (isExplicitMemberSpecialization(redeclTemp)) {
      explicitSpecSuppressor = temp->getTemplatedDecl();
    }
  }
}

// We should never be looking for an attribute directly on a template.
assert(!explicitSpecSuppressor || !isa<TemplateDecl>(explicitSpecSuppressor))((void)0);

// If this member is an explicit member specialization, and it has
// an explicit attribute, ignore visibility from the parent.
bool considerClassVisibility = true;
if (explicitSpecSuppressor &&
    // optimization: hasDVA() is true only with explicit visibility.
    LV.isVisibilityExplicit() &&
    classLV.getVisibility() != DefaultVisibility &&
    hasDirectVisibilityAttribute(explicitSpecSuppressor, computation)) {
  considerClassVisibility = false;
}

// Finally, merge in information from the class.
LV.mergeMaybeWithVisibility(classLV, considerClassVisibility);
return LV;
1067}

1069void NamedDecl::anchor() {}

1071bool NamedDecl::isLinkageValid() const {
if (!hasCachedLinkage())
  return true;

Linkage L = LinkageComputer{}
                .computeLVForDecl(this, LVComputationKind::forLinkageOnly())
                .getLinkage();
return L == getCachedLinkage();
1079}

1081ReservedIdentifierStatus
1082NamedDecl::isReserved(const LangOptions &LangOpts) const {
const IdentifierInfo *II = getIdentifier();

// This triggers at least for CXXLiteralIdentifiers, which we already checked
// at lexing time.
if (!II)
  return ReservedIdentifierStatus::NotReserved;

ReservedIdentifierStatus Status = II->isReserved(LangOpts);
if (Status == ReservedIdentifierStatus::StartsWithUnderscoreAtGlobalScope) {
  // Check if we're at TU level or not.
  if (isa<ParmVarDecl>(this) || isTemplateParameter())
    return ReservedIdentifierStatus::NotReserved;
  const DeclContext *DC = getDeclContext()->getRedeclContext();
  if (!DC->isTranslationUnit())
    return ReservedIdentifierStatus::NotReserved;
}

return Status;
1101}

1103ObjCStringFormatFamily NamedDecl::getObjCFStringFormattingFamily() const {
StringRef name = getName();
if (name.empty()) return SFF_None;

if (name.front() == 'C')
  if (name == "CFStringCreateWithFormat" ||
      name == "CFStringCreateWithFormatAndArguments" ||
      name == "CFStringAppendFormat" ||
      name == "CFStringAppendFormatAndArguments")
    return SFF_CFString;
return SFF_None;
1114}

1116Linkage NamedDecl::getLinkageInternal() const {
// We don't care about visibility here, so ask for the cheapest
// possible visibility analysis.
return LinkageComputer{}
    .getLVForDecl(this, LVComputationKind::forLinkageOnly())
    .getLinkage();
1122}

1124LinkageInfo NamedDecl::getLinkageAndVisibility() const {
return LinkageComputer{}.getDeclLinkageAndVisibility(this);
1126}

1128static Optional<Visibility>
1129getExplicitVisibilityAux(const NamedDecl *ND,
                       NamedDecl::ExplicitVisibilityKind kind,
                       bool IsMostRecent) {
assert(!IsMostRecent || ND == ND->getMostRecentDecl())((void)0);

// Check the declaration itself first.
if (Optional<Visibility> V = getVisibilityOf(ND, kind))
  return V;

// If this is a member class of a specialization of a class template
// and the corresponding decl has explicit visibility, use that.
if (const auto *RD = dyn_cast<CXXRecordDecl>(ND)) {
  CXXRecordDecl *InstantiatedFrom = RD->getInstantiatedFromMemberClass();
  if (InstantiatedFrom)
    return getVisibilityOf(InstantiatedFrom, kind);
}

// If there wasn't explicit visibility there, and this is a
// specialization of a class template, check for visibility
// on the pattern.
if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(ND)) {
  // Walk all the template decl till this point to see if there are
  // explicit visibility attributes.
  const auto *TD = spec->getSpecializedTemplate()->getTemplatedDecl();
  while (TD != nullptr) {
    auto Vis = getVisibilityOf(TD, kind);
    if (Vis != None)
      return Vis;
    TD = TD->getPreviousDecl();
  }
  return None;
}

// Use the most recent declaration.
if (!IsMostRecent && !isa<NamespaceDecl>(ND)) {
  const NamedDecl *MostRecent = ND->getMostRecentDecl();
  if (MostRecent != ND)
    return getExplicitVisibilityAux(MostRecent, kind, true);
}

if (const auto *Var = dyn_cast<VarDecl>(ND)) {
  if (Var->isStaticDataMember()) {
    VarDecl *InstantiatedFrom = Var->getInstantiatedFromStaticDataMember();
    if (InstantiatedFrom)
      return getVisibilityOf(InstantiatedFrom, kind);
  }

  if (const auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(Var))
    return getVisibilityOf(VTSD->getSpecializedTemplate()->getTemplatedDecl(),
                           kind);

  return None;
}
// Also handle function template specializations.
if (const auto *fn = dyn_cast<FunctionDecl>(ND)) {
  // If the function is a specialization of a template with an
  // explicit visibility attribute, use that.
  if (FunctionTemplateSpecializationInfo *templateInfo
        = fn->getTemplateSpecializationInfo())
    return getVisibilityOf(templateInfo->getTemplate()->getTemplatedDecl(),
                           kind);

  // If the function is a member of a specialization of a class template
  // and the corresponding decl has explicit visibility, use that.
  FunctionDecl *InstantiatedFrom = fn->getInstantiatedFromMemberFunction();
  if (InstantiatedFrom)
    return getVisibilityOf(InstantiatedFrom, kind);

  return None;
}

// The visibility of a template is stored in the templated decl.
if (const auto *TD = dyn_cast<TemplateDecl>(ND))
  return getVisibilityOf(TD->getTemplatedDecl(), kind);

return None;
1205}

1207Optional<Visibility>
1208NamedDecl::getExplicitVisibility(ExplicitVisibilityKind kind) const {
return getExplicitVisibilityAux(this, kind, false);
1210}

1212LinkageInfo LinkageComputer::getLVForClosure(const DeclContext *DC,
                                           Decl *ContextDecl,
                                           LVComputationKind computation) {
// This lambda has its linkage/visibility determined by its owner.
const NamedDecl *Owner;
if (!ContextDecl)
  Owner = dyn_cast<NamedDecl>(DC);
else if (isa<ParmVarDecl>(ContextDecl))
  Owner =
      dyn_cast<NamedDecl>(ContextDecl->getDeclContext()->getRedeclContext());
else
  Owner = cast<NamedDecl>(ContextDecl);

if (!Owner)
  return LinkageInfo::none();

// If the owner has a deduced type, we need to skip querying the linkage and
// visibility of that type, because it might involve this closure type.  The
// only effect of this is that we might give a lambda VisibleNoLinkage rather
// than NoLinkage when we don't strictly need to, which is benign.
auto *VD = dyn_cast<VarDecl>(Owner);
LinkageInfo OwnerLV =
    VD && VD->getType()->getContainedDeducedType()
        ? computeLVForDecl(Owner, computation, /*IgnoreVarTypeLinkage*/true)
        : getLVForDecl(Owner, computation);

// A lambda never formally has linkage. But if the owner is externally
// visible, then the lambda is too. We apply the same rules to blocks.
if (!isExternallyVisible(OwnerLV.getLinkage()))
  return LinkageInfo::none();
return LinkageInfo(VisibleNoLinkage, OwnerLV.getVisibility(),
                   OwnerLV.isVisibilityExplicit());
1244}

1246LinkageInfo LinkageComputer::getLVForLocalDecl(const NamedDecl *D,
                                             LVComputationKind computation) {
if (const auto *Function = dyn_cast<FunctionDecl>(D)) {
  if (Function->isInAnonymousNamespace() &&
      !isFirstInExternCContext(Function))
    return getInternalLinkageFor(Function);

  // This is a "void f();" which got merged with a file static.
  if (Function->getCanonicalDecl()->getStorageClass() == SC_Static)
    return getInternalLinkageFor(Function);

  LinkageInfo LV;
  if (!hasExplicitVisibilityAlready(computation)) {
    if (Optional<Visibility> Vis =
            getExplicitVisibility(Function, computation))
      LV.mergeVisibility(*Vis, true);
  }

  // Note that Sema::MergeCompatibleFunctionDecls already takes care of
  // merging storage classes and visibility attributes, so we don't have to
  // look at previous decls in here.

  return LV;
}

if (const auto *Var = dyn_cast<VarDecl>(D)) {
  if (Var->hasExternalStorage()) {
    if (Var->isInAnonymousNamespace() && !isFirstInExternCContext(Var))
      return getInternalLinkageFor(Var);

    LinkageInfo LV;
    if (Var->getStorageClass() == SC_PrivateExtern)
      LV.mergeVisibility(HiddenVisibility, true);
    else if (!hasExplicitVisibilityAlready(computation)) {
      if (Optional<Visibility> Vis = getExplicitVisibility(Var, computation))
        LV.mergeVisibility(*Vis, true);
    }

    if (const VarDecl *Prev = Var->getPreviousDecl()) {
      LinkageInfo PrevLV = getLVForDecl(Prev, computation);
      if (PrevLV.getLinkage())
        LV.setLinkage(PrevLV.getLinkage());
      LV.mergeVisibility(PrevLV);
    }

    return LV;
  }

  if (!Var->isStaticLocal())
    return LinkageInfo::none();
}

ASTContext &Context = D->getASTContext();
if (!Context.getLangOpts().CPlusPlus)
  return LinkageInfo::none();

const Decl *OuterD = getOutermostFuncOrBlockContext(D);
if (!OuterD || OuterD->isInvalidDecl())
  return LinkageInfo::none();

LinkageInfo LV;
if (const auto *BD = dyn_cast<BlockDecl>(OuterD)) {
  if (!BD->getBlockManglingNumber())
    return LinkageInfo::none();

  LV = getLVForClosure(BD->getDeclContext()->getRedeclContext(),
                       BD->getBlockManglingContextDecl(), computation);
} else {
  const auto *FD = cast<FunctionDecl>(OuterD);
  if (!FD->isInlined() &&
      !isTemplateInstantiation(FD->getTemplateSpecializationKind()))
    return LinkageInfo::none();

  // If a function is hidden by -fvisibility-inlines-hidden option and
  // is not explicitly attributed as a hidden function,
  // we should not make static local variables in the function hidden.
  LV = getLVForDecl(FD, computation);
  if (isa<VarDecl>(D) && useInlineVisibilityHidden(FD) &&
      !LV.isVisibilityExplicit() &&
      !Context.getLangOpts().VisibilityInlinesHiddenStaticLocalVar) {
    assert(cast<VarDecl>(D)->isStaticLocal())((void)0);
    // If this was an implicitly hidden inline method, check again for
    // explicit visibility on the parent class, and use that for static locals
    // if present.
    if (const auto *MD = dyn_cast<CXXMethodDecl>(FD))
      LV = getLVForDecl(MD->getParent(), computation);
    if (!LV.isVisibilityExplicit()) {
      Visibility globalVisibility =
          computation.isValueVisibility()
              ? Context.getLangOpts().getValueVisibilityMode()
              : Context.getLangOpts().getTypeVisibilityMode();
      return LinkageInfo(VisibleNoLinkage, globalVisibility,
                         /*visibilityExplicit=*/false);
    }
  }
}
if (!isExternallyVisible(LV.getLinkage()))
  return LinkageInfo::none();
return LinkageInfo(VisibleNoLinkage, LV.getVisibility(),
                   LV.isVisibilityExplicit());
1346}

1348LinkageInfo LinkageComputer::computeLVForDecl(const NamedDecl *D,
                                            LVComputationKind computation,
                                            bool IgnoreVarTypeLinkage) {
// Internal_linkage attribute overrides other considerations.
if (D->hasAttr<InternalLinkageAttr>())
  return getInternalLinkageFor(D);

// Objective-C: treat all Objective-C declarations as having external
// linkage.
switch (D->getKind()) {
  default:
    break;

  // Per C++ [basic.link]p2, only the names of objects, references,
  // functions, types, templates, namespaces, and values ever have linkage.
  //
  // Note that the name of a typedef, namespace alias, using declaration,
  // and so on are not the name of the corresponding type, namespace, or
  // declaration, so they do *not* have linkage.
  case Decl::ImplicitParam:
  case Decl::Label:
  case Decl::NamespaceAlias:
  case Decl::ParmVar:
  case Decl::Using:
  case Decl::UsingEnum:
  case Decl::UsingShadow:
  case Decl::UsingDirective:
    return LinkageInfo::none();

  case Decl::EnumConstant:
    // C++ [basic.link]p4: an enumerator has the linkage of its enumeration.
    if (D->getASTContext().getLangOpts().CPlusPlus)
      return getLVForDecl(cast<EnumDecl>(D->getDeclContext()), computation);
    return LinkageInfo::visible_none();

  case Decl::Typedef:
  case Decl::TypeAlias:
    // A typedef declaration has linkage if it gives a type a name for
    // linkage purposes.
    if (!cast<TypedefNameDecl>(D)
             ->getAnonDeclWithTypedefName(/*AnyRedecl*/true))
      return LinkageInfo::none();
    break;

  case Decl::TemplateTemplateParm: // count these as external
  case Decl::NonTypeTemplateParm:
  case Decl::ObjCAtDefsField:
  case Decl::ObjCCategory:
  case Decl::ObjCCategoryImpl:
  case Decl::ObjCCompatibleAlias:
  case Decl::ObjCImplementation:
  case Decl::ObjCMethod:
  case Decl::ObjCProperty:
  case Decl::ObjCPropertyImpl:
  case Decl::ObjCProtocol:
    return getExternalLinkageFor(D);

  case Decl::CXXRecord: {
    const auto *Record = cast<CXXRecordDecl>(D);
    if (Record->isLambda()) {
      if (Record->hasKnownLambdaInternalLinkage() ||
          !Record->getLambdaManglingNumber()) {
        // This lambda has no mangling number, so it's internal.
        return getInternalLinkageFor(D);
      }

      return getLVForClosure(
                Record->getDeclContext()->getRedeclContext(),
                Record->getLambdaContextDecl(), computation);
    }

    break;
  }

  case Decl::TemplateParamObject: {
    // The template parameter object can be referenced from anywhere its type
    // and value can be referenced.
    auto *TPO = cast<TemplateParamObjectDecl>(D);
    LinkageInfo LV = getLVForType(*TPO->getType(), computation);
    LV.merge(getLVForValue(TPO->getValue(), computation));
    return LV;
  }
}

// Handle linkage for namespace-scope names.
if (D->getDeclContext()->getRedeclContext()->isFileContext())
  return getLVForNamespaceScopeDecl(D, computation, IgnoreVarTypeLinkage);

// C++ [basic.link]p5:
//   In addition, a member function, static data member, a named
//   class or enumeration of class scope, or an unnamed class or
//   enumeration defined in a class-scope typedef declaration such
//   that the class or enumeration has the typedef name for linkage
//   purposes (7.1.3), has external linkage if the name of the class
//   has external linkage.
if (D->getDeclContext()->isRecord())
  return getLVForClassMember(D, computation, IgnoreVarTypeLinkage);

// C++ [basic.link]p6:
//   The name of a function declared in block scope and the name of
//   an object declared by a block scope extern declaration have
//   linkage. If there is a visible declaration of an entity with
//   linkage having the same name and type, ignoring entities
//   declared outside the innermost enclosing namespace scope, the
//   block scope declaration declares that same entity and receives
//   the linkage of the previous declaration. If there is more than
//   one such matching entity, the program is ill-formed. Otherwise,
//   if no matching entity is found, the block scope entity receives
//   external linkage.
if (D->getDeclContext()->isFunctionOrMethod())
  return getLVForLocalDecl(D, computation);

// C++ [basic.link]p6:
//   Names not covered by these rules have no linkage.
return LinkageInfo::none();
1463}

1465/// getLVForDecl - Get the linkage and visibility for the given declaration.
1466LinkageInfo LinkageComputer::getLVForDecl(const NamedDecl *D,
                                        LVComputationKind computation) {
// Internal_linkage attribute overrides other considerations.
if (D->hasAttr<InternalLinkageAttr>())
  return getInternalLinkageFor(D);

if (computation.IgnoreAllVisibility && D->hasCachedLinkage())
  return LinkageInfo(D->getCachedLinkage(), DefaultVisibility, false);

if (llvm::Optional<LinkageInfo> LI = lookup(D, computation))
  return *LI;

LinkageInfo LV = computeLVForDecl(D, computation);
if (D->hasCachedLinkage())
  assert(D->getCachedLinkage() == LV.getLinkage())((void)0);

D->setCachedLinkage(LV.getLinkage());
cache(D, computation, LV);

1485#ifndef NDEBUG1
// In C (because of gnu inline) and in c++ with microsoft extensions an
// static can follow an extern, so we can have two decls with different
// linkages.
const LangOptions &Opts = D->getASTContext().getLangOpts();
if (!Opts.CPlusPlus || Opts.MicrosoftExt)
  return LV;

// We have just computed the linkage for this decl. By induction we know
// that all other computed linkages match, check that the one we just
// computed also does.
NamedDecl *Old = nullptr;
for (auto I : D->redecls()) {
  auto *T = cast<NamedDecl>(I);
  if (T == D)
    continue;
  if (!T->isInvalidDecl() && T->hasCachedLinkage()) {
    Old = T;
    break;
  }
}
assert(!Old || Old->getCachedLinkage() == D->getCachedLinkage())((void)0);
1507#endif

return LV;
1510}

1512LinkageInfo LinkageComputer::getDeclLinkageAndVisibility(const NamedDecl *D) {
NamedDecl::ExplicitVisibilityKind EK = usesTypeVisibility(D)
                                           ? NamedDecl::VisibilityForType
                                           : NamedDecl::VisibilityForValue;
LVComputationKind CK(EK);
return getLVForDecl(D, D->getASTContext().getLangOpts().IgnoreXCOFFVisibility
                           ? CK.forLinkageOnly()
                           : CK);
1520}

1522Module *Decl::getOwningModuleForLinkage(bool IgnoreLinkage) const {
Module *M = getOwningModule();
if (!M)
  return nullptr;

switch (M->Kind) {
case Module::ModuleMapModule:
  // Module map modules have no special linkage semantics.
  return nullptr;

case Module::ModuleInterfaceUnit:
  return M;

case Module::GlobalModuleFragment: {
  // External linkage declarations in the global module have no owning module
  // for linkage purposes. But internal linkage declarations in the global
  // module fragment of a particular module are owned by that module for
  // linkage purposes.
  if (IgnoreLinkage)
    return nullptr;
  bool InternalLinkage;
  if (auto *ND = dyn_cast<NamedDecl>(this))
    InternalLinkage = !ND->hasExternalFormalLinkage();
  else {
    auto *NSD = dyn_cast<NamespaceDecl>(this);
    InternalLinkage = (NSD && NSD->isAnonymousNamespace()) ||
                      isInAnonymousNamespace();
  }
  return InternalLinkage ? M->Parent : nullptr;
}

case Module::PrivateModuleFragment:
  // The private module fragment is part of its containing module for linkage
  // purposes.
  return M->Parent;
}

llvm_unreachable("unknown module kind")__builtin_unreachable();
1560}

1562void NamedDecl::printName(raw_ostream &os) const {
os << Name;
1564}

1566std::string NamedDecl::getQualifiedNameAsString() const {
std::string QualName;
llvm::raw_string_ostream OS(QualName);
printQualifiedName(OS, getASTContext().getPrintingPolicy());
return OS.str();
1571}

1573void NamedDecl::printQualifiedName(raw_ostream &OS) const {
printQualifiedName(OS, getASTContext().getPrintingPolicy());
1575}

1577void NamedDecl::printQualifiedName(raw_ostream &OS,
                                 const PrintingPolicy &P) const {
if (getDeclContext()->isFunctionOrMethod()) {
  // We do not print '(anonymous)' for function parameters without name.
  printName(OS);
  return;
}
printNestedNameSpecifier(OS, P);
if (getDeclName())
  OS << *this;
else {
  // Give the printName override a chance to pick a different name before we
  // fall back to "(anonymous)".
  SmallString<64> NameBuffer;
  llvm::raw_svector_ostream NameOS(NameBuffer);
  printName(NameOS);
  if (NameBuffer.empty())
    OS << "(anonymous)";
  else
    OS << NameBuffer;
}
1598}

1600void NamedDecl::printNestedNameSpecifier(raw_ostream &OS) const {
printNestedNameSpecifier(OS, getASTContext().getPrintingPolicy());
1602}

1604void NamedDecl::printNestedNameSpecifier(raw_ostream &OS,
                                       const PrintingPolicy &P) const {
const DeclContext *Ctx = getDeclContext();

// For ObjC methods and properties, look through categories and use the
// interface as context.
if (auto *MD = dyn_cast<ObjCMethodDecl>(this)) {
  if (auto *ID = MD->getClassInterface())
    Ctx = ID;
} else if (auto *PD = dyn_cast<ObjCPropertyDecl>(this)) {
  if (auto *MD = PD->getGetterMethodDecl())
    if (auto *ID = MD->getClassInterface())
      Ctx = ID;
} else if (auto *ID = dyn_cast<ObjCIvarDecl>(this)) {
  if (auto *CI = ID->getContainingInterface())
    Ctx = CI;
}

if (Ctx->isFunctionOrMethod())
  return;

using ContextsTy = SmallVector<const DeclContext *, 8>;
ContextsTy Contexts;

// Collect named contexts.
DeclarationName NameInScope = getDeclName();
for (; Ctx; Ctx = Ctx->getParent()) {
  // Suppress anonymous namespace if requested.
  if (P.SuppressUnwrittenScope && isa<NamespaceDecl>(Ctx) &&
      cast<NamespaceDecl>(Ctx)->isAnonymousNamespace())
    continue;

  // Suppress inline namespace if it doesn't make the result ambiguous.
  if (P.SuppressInlineNamespace && Ctx->isInlineNamespace() && NameInScope &&
      cast<NamespaceDecl>(Ctx)->isRedundantInlineQualifierFor(NameInScope))
    continue;

  // Skip non-named contexts such as linkage specifications and ExportDecls.
  const NamedDecl *ND = dyn_cast<NamedDecl>(Ctx);
  if (!ND)
    continue;

  Contexts.push_back(Ctx);
  NameInScope = ND->getDeclName();
}

for (unsigned I = Contexts.size(); I != 0; --I) {
  const DeclContext *DC = Contexts[I - 1];
  if (const auto *Spec = dyn_cast<ClassTemplateSpecializationDecl>(DC)) {
    OS << Spec->getName();
    const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs();
    printTemplateArgumentList(
        OS, TemplateArgs.asArray(), P,
        Spec->getSpecializedTemplate()->getTemplateParameters());
  } else if (const auto *ND = dyn_cast<NamespaceDecl>(DC)) {
    if (ND->isAnonymousNamespace()) {
      OS << (P.MSVCFormatting ? "`anonymous namespace\'"
                              : "(anonymous namespace)");
    }
    else
      OS << *ND;
  } else if (const auto *RD = dyn_cast<RecordDecl>(DC)) {
    if (!RD->getIdentifier())
      OS << "(anonymous " << RD->getKindName() << ')';
    else
      OS << *RD;
  } else if (const auto *FD = dyn_cast<FunctionDecl>(DC)) {
    const FunctionProtoType *FT = nullptr;
    if (FD->hasWrittenPrototype())
      FT = dyn_cast<FunctionProtoType>(FD->getType()->castAs<FunctionType>());

    OS << *FD << '(';
    if (FT) {
      unsigned NumParams = FD->getNumParams();
      for (unsigned i = 0; i < NumParams; ++i) {
        if (i)
          OS << ", ";
        OS << FD->getParamDecl(i)->getType().stream(P);
      }

      if (FT->isVariadic()) {
        if (NumParams > 0)
          OS << ", ";
        OS << "...";
      }
    }
    OS << ')';
  } else if (const auto *ED = dyn_cast<EnumDecl>(DC)) {
    // C++ [dcl.enum]p10: Each enum-name and each unscoped
    // enumerator is declared in the scope that immediately contains
    // the enum-specifier. Each scoped enumerator is declared in the
    // scope of the enumeration.
    // For the case of unscoped enumerator, do not include in the qualified
    // name any information about its enum enclosing scope, as its visibility
    // is global.
    if (ED->isScoped())
      OS << *ED;
    else
      continue;
  } else {
    OS << *cast<NamedDecl>(DC);
  }
  OS << "::";
}
1708}

1710void NamedDecl::getNameForDiagnostic(raw_ostream &OS,
                                   const PrintingPolicy &Policy,
                                   bool Qualified) const {
if (Qualified)
  printQualifiedName(OS, Policy);
else
  printName(OS);
1717}

1719template<typename T> static bool isRedeclarableImpl(Redeclarable<T> *) {
return true;
1721}
1722static bool isRedeclarableImpl(...) { return false; }
1723static bool isRedeclarable(Decl::Kind K) {
switch (K) {
1725#define DECL(Type, Base) \
case Decl::Type: \
  return isRedeclarableImpl((Type##Decl *)nullptr);
1728#define ABSTRACT_DECL(DECL)
1729#include "clang/AST/DeclNodes.inc"
}
llvm_unreachable("unknown decl kind")__builtin_unreachable();
1732}

1734bool NamedDecl::declarationReplaces(NamedDecl *OldD, bool IsKnownNewer) const {
assert(getDeclName() == OldD->getDeclName() && "Declaration name mismatch")((void)0);

// Never replace one imported declaration with another; we need both results
// when re-exporting.
if (OldD->isFromASTFile() && isFromASTFile())
  return false;

// A kind mismatch implies that the declaration is not replaced.
if (OldD->getKind() != getKind())
  return false;

// For method declarations, we never replace. (Why?)
if (isa<ObjCMethodDecl>(this))
  return false;

// For parameters, pick the newer one. This is either an error or (in
// Objective-C) permitted as an extension.
if (isa<ParmVarDecl>(this))
  return true;

// Inline namespaces can give us two declarations with the same
// name and kind in the same scope but different contexts; we should
// keep both declarations in this case.
if (!this->getDeclContext()->getRedeclContext()->Equals(
        OldD->getDeclContext()->getRedeclContext()))
  return false;

// Using declarations can be replaced if they import the same name from the
// same context.
if (auto *UD = dyn_cast<UsingDecl>(this)) {
  ASTContext &Context = getASTContext();
  return Context.getCanonicalNestedNameSpecifier(UD->getQualifier()) ==
         Context.getCanonicalNestedNameSpecifier(
             cast<UsingDecl>(OldD)->getQualifier());
}
if (auto *UUVD = dyn_cast<UnresolvedUsingValueDecl>(this)) {
  ASTContext &Context = getASTContext();
  return Context.getCanonicalNestedNameSpecifier(UUVD->getQualifier()) ==
         Context.getCanonicalNestedNameSpecifier(
                      cast<UnresolvedUsingValueDecl>(OldD)->getQualifier());
}

if (isRedeclarable(getKind())) {
  if (getCanonicalDecl() != OldD->getCanonicalDecl())
    return false;

  if (IsKnownNewer)
    return true;

  // Check whether this is actually newer than OldD. We want to keep the
  // newer declaration. This loop will usually only iterate once, because
  // OldD is usually the previous declaration.
  for (auto D : redecls()) {
    if (D == OldD)
      break;

    // If we reach the canonical declaration, then OldD is not actually older
    // than this one.
    //
    // FIXME: In this case, we should not add this decl to the lookup table.
    if (D->isCanonicalDecl())
      return false;
  }

  // It's a newer declaration of the same kind of declaration in the same
  // scope: we want this decl instead of the existing one.
  return true;
}

// In all other cases, we need to keep both declarations in case they have
// different visibility. Any attempt to use the name will result in an
// ambiguity if more than one is visible.
return false;
1808}

1810bool NamedDecl::hasLinkage() const {
return getFormalLinkage() != NoLinkage;
1812}

1814NamedDecl *NamedDecl::getUnderlyingDeclImpl() {
NamedDecl *ND = this;
while (auto *UD = dyn_cast<UsingShadowDecl>(ND))
  ND = UD->getTargetDecl();

if (auto *AD = dyn_cast<ObjCCompatibleAliasDecl>(ND))
  return AD->getClassInterface();

if (auto *AD = dyn_cast<NamespaceAliasDecl>(ND))
  return AD->getNamespace();

return ND;
1826}

1828bool NamedDecl::isCXXInstanceMember() const {
if (!isCXXClassMember())
  return false;

const NamedDecl *D = this;
if (isa<UsingShadowDecl>(D))
  D = cast<UsingShadowDecl>(D)->getTargetDecl();

if (isa<FieldDecl>(D) || isa<IndirectFieldDecl>(D) || isa<MSPropertyDecl>(D))
  return true;
if (const auto *MD = dyn_cast_or_null<CXXMethodDecl>(D->getAsFunction()))
  return MD->isInstance();
return false;
1841}

1843//===----------------------------------------------------------------------===//
1844// DeclaratorDecl Implementation
1845//===----------------------------------------------------------------------===//

1847template <typename DeclT>
1848static SourceLocation getTemplateOrInnerLocStart(const DeclT *decl) {
if (decl->getNumTemplateParameterLists() > 0)
  return decl->getTemplateParameterList(0)->getTemplateLoc();
return decl->getInnerLocStart();
1852}

1854SourceLocation DeclaratorDecl::getTypeSpecStartLoc() const {
TypeSourceInfo *TSI = getTypeSourceInfo();
if (TSI) return TSI->getTypeLoc().getBeginLoc();
return SourceLocation();
1858}

1860SourceLocation DeclaratorDecl::getTypeSpecEndLoc() const {
TypeSourceInfo *TSI = getTypeSourceInfo();
if (TSI) return TSI->getTypeLoc().getEndLoc();
return SourceLocation();
1864}

1866void DeclaratorDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) {
if (QualifierLoc) {
  // Make sure the extended decl info is allocated.
  if (!hasExtInfo()) {
    // Save (non-extended) type source info pointer.
    auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
    // Allocate external info struct.
    DeclInfo = new (getASTContext()) ExtInfo;
    // Restore savedTInfo into (extended) decl info.
    getExtInfo()->TInfo = savedTInfo;
  }
  // Set qualifier info.
  getExtInfo()->QualifierLoc = QualifierLoc;
} else if (hasExtInfo()) {
  // Here Qualifier == 0, i.e., we are removing the qualifier (if any).
  getExtInfo()->QualifierLoc = QualifierLoc;
}
1883}

1885void DeclaratorDecl::setTrailingRequiresClause(Expr *TrailingRequiresClause) {
assert(TrailingRequiresClause)((void)0);
// Make sure the extended decl info is allocated.
if (!hasExtInfo()) {
  // Save (non-extended) type source info pointer.
  auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
  // Allocate external info struct.
  DeclInfo = new (getASTContext()) ExtInfo;
  // Restore savedTInfo into (extended) decl info.
  getExtInfo()->TInfo = savedTInfo;
}
// Set requires clause info.
getExtInfo()->TrailingRequiresClause = TrailingRequiresClause;
1898}

1900void DeclaratorDecl::setTemplateParameterListsInfo(
  ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
assert(!TPLists.empty())((void)0);
// Make sure the extended decl info is allocated.
if (!hasExtInfo()) {
  // Save (non-extended) type source info pointer.
  auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
  // Allocate external info struct.
  DeclInfo = new (getASTContext()) ExtInfo;
  // Restore savedTInfo into (extended) decl info.
  getExtInfo()->TInfo = savedTInfo;
}
// Set the template parameter lists info.
getExtInfo()->setTemplateParameterListsInfo(Context, TPLists);
1914}

1916SourceLocation DeclaratorDecl::getOuterLocStart() const {
return getTemplateOrInnerLocStart(this);
1918}

1920// Helper function: returns true if QT is or contains a type
1921// having a postfix component.
1922static bool typeIsPostfix(QualType QT) {
while (true) {
  const Type* T = QT.getTypePtr();
  switch (T->getTypeClass()) {
  default:
    return false;
  case Type::Pointer:
    QT = cast<PointerType>(T)->getPointeeType();
    break;
  case Type::BlockPointer:
    QT = cast<BlockPointerType>(T)->getPointeeType();
    break;
  case Type::MemberPointer:
    QT = cast<MemberPointerType>(T)->getPointeeType();
    break;
  case Type::LValueReference:
  case Type::RValueReference:
    QT = cast<ReferenceType>(T)->getPointeeType();
    break;
  case Type::PackExpansion:
    QT = cast<PackExpansionType>(T)->getPattern();
    break;
  case Type::Paren:
  case Type::ConstantArray:
  case Type::DependentSizedArray:
  case Type::IncompleteArray:
  case Type::VariableArray:
  case Type::FunctionProto:
  case Type::FunctionNoProto:
    return true;
  }
}
1954}

1956SourceRange DeclaratorDecl::getSourceRange() const {
SourceLocation RangeEnd = getLocation();
if (TypeSourceInfo *TInfo = getTypeSourceInfo()) {
  // If the declaration has no name or the type extends past the name take the
  // end location of the type.
  if (!getDeclName() || typeIsPostfix(TInfo->getType()))
    RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
}
return SourceRange(getOuterLocStart(), RangeEnd);
1965}

1967void QualifierInfo::setTemplateParameterListsInfo(
  ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
// Free previous template parameters (if any).
if (NumTemplParamLists > 0) {
  Context.Deallocate(TemplParamLists);
  TemplParamLists = nullptr;
  NumTemplParamLists = 0;
}
// Set info on matched template parameter lists (if any).
if (!TPLists.empty()) {
  TemplParamLists = new (Context) TemplateParameterList *[TPLists.size()];
  NumTemplParamLists = TPLists.size();
  std::copy(TPLists.begin(), TPLists.end(), TemplParamLists);
}
1981}

1983//===----------------------------------------------------------------------===//
1984// VarDecl Implementation
1985//===----------------------------------------------------------------------===//

1987const char *VarDecl::getStorageClassSpecifierString(StorageClass SC) {
switch (SC) {
case SC_None:                 break;
case SC_Auto:                 return "auto";
case SC_Extern:               return "extern";
case SC_PrivateExtern:        return "__private_extern__";
case SC_Register:             return "register";
case SC_Static:               return "static";
}

llvm_unreachable("Invalid storage class")__builtin_unreachable();
1998}

2000VarDecl::VarDecl(Kind DK, ASTContext &C, DeclContext *DC,
               SourceLocation StartLoc, SourceLocation IdLoc,
               IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo,
               StorageClass SC)
  : DeclaratorDecl(DK, DC, IdLoc, Id, T, TInfo, StartLoc),
    redeclarable_base(C) {
static_assert(sizeof(VarDeclBitfields) <= sizeof(unsigned),
              "VarDeclBitfields too large!");
static_assert(sizeof(ParmVarDeclBitfields) <= sizeof(unsigned),
              "ParmVarDeclBitfields too large!");
static_assert(sizeof(NonParmVarDeclBitfields) <= sizeof(unsigned),
              "NonParmVarDeclBitfields too large!");
AllBits = 0;
VarDeclBits.SClass = SC;
// Everything else is implicitly initialized to false.
2015}

2017VarDecl *VarDecl::Create(ASTContext &C, DeclContext *DC,
                       SourceLocation StartL, SourceLocation IdL,
                       IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo,
                       StorageClass S) {
return new (C, DC) VarDecl(Var, C, DC, StartL, IdL, Id, T, TInfo, S);
2022}

2024VarDecl *VarDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
return new (C, ID)
    VarDecl(Var, C, nullptr, SourceLocation(), SourceLocation(), nullptr,
            QualType(), nullptr, SC_None);
2028}

2030void VarDecl::setStorageClass(StorageClass SC) {
assert(isLegalForVariable(SC))((void)0);
VarDeclBits.SClass = SC;
2033}

2035VarDecl::TLSKind VarDecl::getTLSKind() const {
switch (VarDeclBits.TSCSpec) {
case TSCS_unspecified:
  if (!hasAttr<ThreadAttr>() &&
      !(getASTContext().getLangOpts().OpenMPUseTLS &&
        getASTContext().getTargetInfo().isTLSSupported() &&
        hasAttr<OMPThreadPrivateDeclAttr>()))
    return TLS_None;
  return ((getASTContext().getLangOpts().isCompatibleWithMSVC(
              LangOptions::MSVC2015)) ||
          hasAttr<OMPThreadPrivateDeclAttr>())
             ? TLS_Dynamic
             : TLS_Static;
case TSCS___thread: // Fall through.
case TSCS__Thread_local:
  return TLS_Static;
case TSCS_thread_local:
  return TLS_Dynamic;
}
llvm_unreachable("Unknown thread storage class specifier!")__builtin_unreachable();
2055}

2057SourceRange VarDecl::getSourceRange() const {
if (const Expr *Init = getInit()) {
  SourceLocation InitEnd = Init->getEndLoc();
  // If Init is implicit, ignore its source range and fallback on
  // DeclaratorDecl::getSourceRange() to handle postfix elements.
  if (InitEnd.isValid() && InitEnd != getLocation())
    return SourceRange(getOuterLocStart(), InitEnd);
}
return DeclaratorDecl::getSourceRange();
2066}

2068template<typename T>
2069static LanguageLinkage getDeclLanguageLinkage(const T &D) {
// C++ [dcl.link]p1: All function types, function names with external linkage,
// and variable names with external linkage have a language linkage.
if (!D.hasExternalFormalLinkage())
  return NoLanguageLinkage;

// Language linkage is a C++ concept, but saying that everything else in C has
// C language linkage fits the implementation nicely.
ASTContext &Context = D.getASTContext();
if (!Context.getLangOpts().CPlusPlus)
  return CLanguageLinkage;

// C++ [dcl.link]p4: A C language linkage is ignored in determining the
// language linkage of the names of class members and the function type of
// class member functions.
const DeclContext *DC = D.getDeclContext();
if (DC->isRecord())
  return CXXLanguageLinkage;

// If the first decl is in an extern "C" context, any other redeclaration
// will have C language linkage. If the first one is not in an extern "C"
// context, we would have reported an error for any other decl being in one.
if (isFirstInExternCContext(&D))
  return CLanguageLinkage;
return CXXLanguageLinkage;
2094}

2096template<typename T>
2097static bool isDeclExternC(const T &D) {
// Since the context is ignored for class members, they can only have C++
// language linkage or no language linkage.
const DeclContext *DC = D.getDeclContext();
if (DC->isRecord()) {
  assert(D.getASTContext().getLangOpts().CPlusPlus)((void)0);
  return false;
}

return D.getLanguageLinkage() == CLanguageLinkage;
2107}

2109LanguageLinkage VarDecl::getLanguageLinkage() const {
return getDeclLanguageLinkage(*this);
2111}

2113bool VarDecl::isExternC() const {
return isDeclExternC(*this);
2115}

2117bool VarDecl::isInExternCContext() const {
return getLexicalDeclContext()->isExternCContext();
2119}

2121bool VarDecl::isInExternCXXContext() const {
return getLexicalDeclContext()->isExternCXXContext();
2123}

2125VarDecl *VarDecl::getCanonicalDecl() { return getFirstDecl(); }

2127VarDecl::DefinitionKind
2128VarDecl::isThisDeclarationADefinition(ASTContext &C) const {
if (isThisDeclarationADemotedDefinition())
  return DeclarationOnly;

// C++ [basic.def]p2:
//   A declaration is a definition unless [...] it contains the 'extern'
//   specifier or a linkage-specification and neither an initializer [...],
//   it declares a non-inline static data member in a class declaration [...],
//   it declares a static data member outside a class definition and the variable
//   was defined within the class with the constexpr specifier [...],
// C++1y [temp.expl.spec]p15:
//   An explicit specialization of a static data member or an explicit
//   specialization of a static data member template is a definition if the
//   declaration includes an initializer; otherwise, it is a declaration.
//
// FIXME: How do you declare (but not define) a partial specialization of
// a static data member template outside the containing class?
if (isStaticDataMember()) {
  if (isOutOfLine() &&
      !(getCanonicalDecl()->isInline() &&
        getCanonicalDecl()->isConstexpr()) &&
      (hasInit() ||
       // If the first declaration is out-of-line, this may be an
       // instantiation of an out-of-line partial specialization of a variable
       // template for which we have not yet instantiated the initializer.
       (getFirstDecl()->isOutOfLine()
            ? getTemplateSpecializationKind() == TSK_Undeclared
            : getTemplateSpecializationKind() !=
                  TSK_ExplicitSpecialization) ||
       isa<VarTemplatePartialSpecializationDecl>(this)))
    return Definition;
  if (!isOutOfLine() && isInline())
    return Definition;
  return DeclarationOnly;
}
// C99 6.7p5:
//   A definition of an identifier is a declaration for that identifier that
//   [...] causes storage to be reserved for that object.
// Note: that applies for all non-file-scope objects.
// C99 6.9.2p1:
//   If the declaration of an identifier for an object has file scope and an
//   initializer, the declaration is an external definition for the identifier
if (hasInit())
  return Definition;

if (hasDefiningAttr())
  return Definition;

if (const auto *SAA = getAttr<SelectAnyAttr>())
  if (!SAA->isInherited())
    return Definition;

// A variable template specialization (other than a static data member
// template or an explicit specialization) is a declaration until we
// instantiate its initializer.
if (auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(this)) {
  if (VTSD->getTemplateSpecializationKind() != TSK_ExplicitSpecialization &&
      !isa<VarTemplatePartialSpecializationDecl>(VTSD) &&
      !VTSD->IsCompleteDefinition)
    return DeclarationOnly;
}

if (hasExternalStorage())
  return DeclarationOnly;

// [dcl.link] p7:
//   A declaration directly contained in a linkage-specification is treated
//   as if it contains the extern specifier for the purpose of determining
//   the linkage of the declared name and whether it is a definition.
if (isSingleLineLanguageLinkage(*this))
  return DeclarationOnly;

// C99 6.9.2p2:
//   A declaration of an object that has file scope without an initializer,
//   and without a storage class specifier or the scs 'static', constitutes
//   a tentative definition.
// No such thing in C++.
if (!C.getLangOpts().CPlusPlus && isFileVarDecl())
  return TentativeDefinition;

// What's left is (in C, block-scope) declarations without initializers or
// external storage. These are definitions.
return Definition;
2211}

2213VarDecl *VarDecl::getActingDefinition() {
DefinitionKind Kind = isThisDeclarationADefinition();
if (Kind != TentativeDefinition)
  return nullptr;

VarDecl *LastTentative = nullptr;
VarDecl *First = getFirstDecl();
for (auto I : First->redecls()) {
  Kind = I->isThisDeclarationADefinition();
  if (Kind == Definition)
    return nullptr;
  if (Kind == TentativeDefinition)
    LastTentative = I;
}
return LastTentative;
2228}

2230VarDecl *VarDecl::getDefinition(ASTContext &C) {
VarDecl *First = getFirstDecl();
for (auto I : First->redecls()) {
  if (I->isThisDeclarationADefinition(C) == Definition)
    return I;
}
return nullptr;
2237}

2239VarDecl::DefinitionKind VarDecl::hasDefinition(ASTContext &C) const {
DefinitionKind Kind = DeclarationOnly;

const VarDecl *First = getFirstDecl();
for (auto I : First->redecls()) {
  Kind = std::max(Kind, I->isThisDeclarationADefinition(C));
  if (Kind == Definition)
    break;
}

return Kind;
2250}

2252const Expr *VarDecl::getAnyInitializer(const VarDecl *&D) const {
for (auto I : redecls()) {
  if (auto Expr = I->getInit()) {
    D = I;
    return Expr;
  }
}
return nullptr;
2260}

2262bool VarDecl::hasInit() const {
if (auto *P = dyn_cast<ParmVarDecl>(this))
  if (P->hasUnparsedDefaultArg() || P->hasUninstantiatedDefaultArg())
    return false;

return !Init.isNull();
2268}

2270Expr *VarDecl::getInit() {
if (!hasInit())
  return nullptr;

if (auto *S = Init.dyn_cast<Stmt *>())
  return cast<Expr>(S);

return cast_or_null<Expr>(Init.get<EvaluatedStmt *>()->Value);
2278}

2280Stmt **VarDecl::getInitAddress() {
if (auto *ES = Init.dyn_cast<EvaluatedStmt *>())
  return &ES->Value;

return Init.getAddrOfPtr1();
2285}

2287VarDecl *VarDecl::getInitializingDeclaration() {
VarDecl *Def = nullptr;
for (auto I : redecls()) {
  if (I->hasInit())
    return I;

  if (I->isThisDeclarationADefinition()) {
    if (isStaticDataMember())
      return I;
    Def = I;
  }
}
return Def;
2300}

2302bool VarDecl::isOutOfLine() const {
if (Decl::isOutOfLine())
  return true;

if (!isStaticDataMember())
  return false;

// If this static data member was instantiated from a static data member of
// a class template, check whether that static data member was defined
// out-of-line.
if (VarDecl *VD = getInstantiatedFromStaticDataMember())
  return VD->isOutOfLine();

return false;
2316}

2318void VarDecl::setInit(Expr *I) {
if (auto *Eval = Init.dyn_cast<EvaluatedStmt *>()) {
  Eval->~EvaluatedStmt();
  getASTContext().Deallocate(Eval);
}

Init = I;
2325}

2327bool VarDecl::mightBeUsableInConstantExpressions(const ASTContext &C) const {
const LangOptions &Lang = C.getLangOpts();

// OpenCL permits const integral variables to be used in constant
// expressions, like in C++98.
if (!Lang.CPlusPlus && !Lang.OpenCL)
  return false;

// Function parameters are never usable in constant expressions.
if (isa<ParmVarDecl>(this))
  return false;

// The values of weak variables are never usable in constant expressions.
if (isWeak())
  return false;

// In C++11, any variable of reference type can be used in a constant
// expression if it is initialized by a constant expression.
if (Lang.CPlusPlus11 && getType()->isReferenceType())
  return true;

// Only const objects can be used in constant expressions in C++. C++98 does
// not require the variable to be non-volatile, but we consider this to be a
// defect.
if (!getType().isConstant(C) || getType().isVolatileQualified())
  return false;

// In C++, const, non-volatile variables of integral or enumeration types
// can be used in constant expressions.
if (getType()->isIntegralOrEnumerationType())
  return true;

// Additionally, in C++11, non-volatile constexpr variables can be used in
// constant expressions.
return Lang.CPlusPlus11 && isConstexpr();
2362}

2364bool VarDecl::isUsableInConstantExpressions(const ASTContext &Context) const {
// C++2a [expr.const]p3:
//   A variable is usable in constant expressions after its initializing
//   declaration is encountered...
const VarDecl *DefVD = nullptr;
const Expr *Init = getAnyInitializer(DefVD);
if (!Init || Init->isValueDependent() || getType()->isDependentType())
  return false;
//   ... if it is a constexpr variable, or it is of reference type or of
//   const-qualified integral or enumeration type, ...
if (!DefVD->mightBeUsableInConstantExpressions(Context))
  return false;
//   ... and its initializer is a constant initializer.
if (Context.getLangOpts().CPlusPlus && !DefVD->hasConstantInitialization())
  return false;
// C++98 [expr.const]p1:
//   An integral constant-expression can involve only [...] const variables
//   or static data members of integral or enumeration types initialized with
//   [integer] constant expressions (dcl.init)
if ((Context.getLangOpts().CPlusPlus || Context.getLangOpts().OpenCL) &&
    !Context.getLangOpts().CPlusPlus11 && !DefVD->hasICEInitializer(Context))
  return false;
return true;
2387}

2389/// Convert the initializer for this declaration to the elaborated EvaluatedStmt
2390/// form, which contains extra information on the evaluated value of the
2391/// initializer.
2392EvaluatedStmt *VarDecl::ensureEvaluatedStmt() const {
auto *Eval = Init.dyn_cast<EvaluatedStmt *>();
if (!Eval) {
  // Note: EvaluatedStmt contains an APValue, which usually holds
  // resources not allocated from the ASTContext.  We need to do some
  // work to avoid leaking those, but we do so in VarDecl::evaluateValue
  // where we can detect whether there's anything to clean up or not.
  Eval = new (getASTContext()) EvaluatedStmt;
  Eval->Value = Init.get<Stmt *>();
  Init = Eval;
}
return Eval;
2404}

2406EvaluatedStmt *VarDecl::getEvaluatedStmt() const {
return Init.dyn_cast<EvaluatedStmt *>();
2408}

2410APValue *VarDecl::evaluateValue() const {
SmallVector<PartialDiagnosticAt, 8> Notes;
return evaluateValueImpl(Notes, hasConstantInitialization());
2413}

2415APValue *VarDecl::evaluateValueImpl(SmallVectorImpl<PartialDiagnosticAt> &Notes,
                                  bool IsConstantInitialization) const {
EvaluatedStmt *Eval = ensureEvaluatedStmt();

const auto *Init = cast<Expr>(Eval->Value);
assert(!Init->isValueDependent())((void)0);

// We only produce notes indicating why an initializer is non-constant the
// first time it is evaluated. FIXME: The notes won't always be emitted the
// first time we try evaluation, so might not be produced at all.
if (Eval->WasEvaluated)
  return Eval->Evaluated.isAbsent() ? nullptr : &Eval->Evaluated;

if (Eval->IsEvaluating) {
  // FIXME: Produce a diagnostic for self-initialization.
  return nullptr;
}

Eval->IsEvaluating = true;

ASTContext &Ctx = getASTContext();
bool Result = Init->EvaluateAsInitializer(Eval->Evaluated, Ctx, this, Notes,
                                          IsConstantInitialization);

// In C++11, this isn't a constant initializer if we produced notes. In that
// case, we can't keep the result, because it may only be correct under the
// assumption that the initializer is a constant context.
if (IsConstantInitialization && Ctx.getLangOpts().CPlusPlus11 &&
    !Notes.empty())
  Result = false;

// Ensure the computed APValue is cleaned up later if evaluation succeeded,
// or that it's empty (so that there's nothing to clean up) if evaluation
// failed.
if (!Result)
  Eval->Evaluated = APValue();
else if (Eval->Evaluated.needsCleanup())
  Ctx.addDestruction(&Eval->Evaluated);

Eval->IsEvaluating = false;
Eval->WasEvaluated = true;

return Result ? &Eval->Evaluated : nullptr;
2458}

2460APValue *VarDecl::getEvaluatedValue() const {
if (EvaluatedStmt *Eval = getEvaluatedStmt())
  if (Eval->WasEvaluated)
    return &Eval->Evaluated;

return nullptr;
2466}

2468bool VarDecl::hasICEInitializer(const ASTContext &Context) const {
const Expr *Init = getInit();
assert(Init && "no initializer")((void)0);

EvaluatedStmt *Eval = ensureEvaluatedStmt();
if (!Eval->CheckedForICEInit) {
  Eval->CheckedForICEInit = true;
  Eval->HasICEInit = Init->isIntegerConstantExpr(Context);
}
return Eval->HasICEInit;
2478}

2480bool VarDecl::hasConstantInitialization() const {
// In C, all globals (and only globals) have constant initialization.
if (hasGlobalStorage() && !getASTContext().getLangOpts().CPlusPlus)
  return true;

// In C++, it depends on whether the evaluation at the point of definition
// was evaluatable as a constant initializer.
if (EvaluatedStmt *Eval = getEvaluatedStmt())
  return Eval->HasConstantInitialization;

return false;
2491}

2493bool VarDecl::checkForConstantInitialization(
  SmallVectorImpl<PartialDiagnosticAt> &Notes) const {
EvaluatedStmt *Eval = ensureEvaluatedStmt();
// If we ask for the value before we know whether we have a constant
// initializer, we can compute the wrong value (for example, due to
// std::is_constant_evaluated()).
assert(!Eval->WasEvaluated &&((void)0)
       "already evaluated var value before checking for constant init")((void)0);
assert(getASTContext().getLangOpts().CPlusPlus && "only meaningful in C++")((void)0);

assert(!cast<Expr>(Eval->Value)->isValueDependent())((void)0);

// Evaluate the initializer to check whether it's a constant expression.
Eval->HasConstantInitialization =
    evaluateValueImpl(Notes, true) && Notes.empty();

// If evaluation as a constant initializer failed, allow re-evaluation as a
// non-constant initializer if we later find we want the value.
if (!Eval->HasConstantInitialization)
  Eval->WasEvaluated = false;

return Eval->HasConstantInitialization;
2515}

2517bool VarDecl::isParameterPack() const {
return isa<PackExpansionType>(getType());
2519}

2521template<typename DeclT>
2522static DeclT *getDefinitionOrSelf(DeclT *D) {
assert(D)((void)0);
if (auto *Def = D->getDefinition())
  return Def;
return D;
2527}

2529bool VarDecl::isEscapingByref() const {
return hasAttr<BlocksAttr>() && NonParmVarDeclBits.EscapingByref;
2531}

2533bool VarDecl::isNonEscapingByref() const {
return hasAttr<BlocksAttr>() && !NonParmVarDeclBits.EscapingByref;
2535}

2537bool VarDecl::hasDependentAlignment() const {
QualType T = getType();
return T->isDependentType() || T->isUndeducedAutoType() ||
       llvm::any_of(specific_attrs<AlignedAttr>(), [](const AlignedAttr *AA) {
         return AA->isAlignmentDependent();
       });
2543}

2545VarDecl *VarDecl::getTemplateInstantiationPattern() const {
const VarDecl *VD = this;

// If this is an instantiated member, walk back to the template from which
// it was instantiated.
if (MemberSpecializationInfo *MSInfo = VD->getMemberSpecializationInfo()) {
  if (isTemplateInstantiation(MSInfo->getTemplateSpecializationKind())) {
    VD = VD->getInstantiatedFromStaticDataMember();
    while (auto *NewVD = VD->getInstantiatedFromStaticDataMember())
      VD = NewVD;
  }
}

// If it's an instantiated variable template specialization, find the
// template or partial specialization from which it was instantiated.
if (auto *VDTemplSpec = dyn_cast<VarTemplateSpecializationDecl>(VD)) {
  if (isTemplateInstantiation(VDTemplSpec->getTemplateSpecializationKind())) {
    auto From = VDTemplSpec->getInstantiatedFrom();
    if (auto *VTD = From.dyn_cast<VarTemplateDecl *>()) {
      while (!VTD->isMemberSpecialization()) {
        auto *NewVTD = VTD->getInstantiatedFromMemberTemplate();
        if (!NewVTD)
          break;
        VTD = NewVTD;
      }
      return getDefinitionOrSelf(VTD->getTemplatedDecl());
    }
    if (auto *VTPSD =
            From.dyn_cast<VarTemplatePartialSpecializationDecl *>()) {
      while (!VTPSD->isMemberSpecialization()) {
        auto *NewVTPSD = VTPSD->getInstantiatedFromMember();
        if (!NewVTPSD)
          break;
        VTPSD = NewVTPSD;
      }
      return getDefinitionOrSelf<VarDecl>(VTPSD);
    }
  }
}

// If this is the pattern of a variable template, find where it was
// instantiated from. FIXME: Is this necessary?
if (VarTemplateDecl *VarTemplate = VD->getDescribedVarTemplate()) {
  while (!VarTemplate->isMemberSpecialization()) {
    auto *NewVT = VarTemplate->getInstantiatedFromMemberTemplate();
    if (!NewVT)
      break;
    VarTemplate = NewVT;
  }

  return getDefinitionOrSelf(VarTemplate->getTemplatedDecl());
}

if (VD == this)
  return nullptr;
return getDefinitionOrSelf(const_cast<VarDecl*>(VD));
2601}

2603VarDecl *VarDecl::getInstantiatedFromStaticDataMember() const {
if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
  return cast<VarDecl>(MSI->getInstantiatedFrom());

return nullptr;
2608}

2610TemplateSpecializationKind VarDecl::getTemplateSpecializationKind() const {
if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
  return Spec->getSpecializationKind();

if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
  return MSI->getTemplateSpecializationKind();

return TSK_Undeclared;
2618}

2620TemplateSpecializationKind
2621VarDecl::getTemplateSpecializationKindForInstantiation() const {
if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
  return MSI->getTemplateSpecializationKind();

if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
  return Spec->getSpecializationKind();

return TSK_Undeclared;
2629}

2631SourceLocation VarDecl::getPointOfInstantiation() const {
if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
  return Spec->getPointOfInstantiation();

if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
  return MSI->getPointOfInstantiation();

return SourceLocation();
2639}

2641VarTemplateDecl *VarDecl::getDescribedVarTemplate() const {
return getASTContext().getTemplateOrSpecializationInfo(this)
    .dyn_cast<VarTemplateDecl *>();
2644}

2646void VarDecl::setDescribedVarTemplate(VarTemplateDecl *Template) {
getASTContext().setTemplateOrSpecializationInfo(this, Template);
2648}

2650bool VarDecl::isKnownToBeDefined() const {
const auto &LangOpts = getASTContext().getLangOpts();
// In CUDA mode without relocatable device code, variables of form 'extern
// __shared__ Foo foo[]' are pointers to the base of the GPU core's shared
// memory pool.  These are never undefined variables, even if they appear
// inside of an anon namespace or static function.
//
// With CUDA relocatable device code enabled, these variables don't get
// special handling; they're treated like regular extern variables.
if (LangOpts.CUDA && !LangOpts.GPURelocatableDeviceCode &&
    hasExternalStorage() && hasAttr<CUDASharedAttr>() &&
    isa<IncompleteArrayType>(getType()))
  return true;

return hasDefinition();
2665}

2667bool VarDecl::isNoDestroy(const ASTContext &Ctx) const {
return hasGlobalStorage() && (hasAttr<NoDestroyAttr>() ||
                              (!Ctx.getLangOpts().RegisterStaticDestructors &&
                               !hasAttr<AlwaysDestroyAttr>()));
2671}

2673QualType::DestructionKind
2674VarDecl::needsDestruction(const ASTContext &Ctx) const {
if (EvaluatedStmt *Eval = getEvaluatedStmt())
  if (Eval->HasConstantDestruction)
    return QualType::DK_none;

if (isNoDestroy(Ctx))
  return QualType::DK_none;

return getType().isDestructedType();
2683}

2685MemberSpecializationInfo *VarDecl::getMemberSpecializationInfo() const {
if (isStaticDataMember())
  // FIXME: Remove ?
  // return getASTContext().getInstantiatedFromStaticDataMember(this);
  return getASTContext().getTemplateOrSpecializationInfo(this)
      .dyn_cast<MemberSpecializationInfo *>();
return nullptr;
2692}

2694void VarDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
                                       SourceLocation PointOfInstantiation) {
assert((isa<VarTemplateSpecializationDecl>(this) ||((void)0)
        getMemberSpecializationInfo()) &&((void)0)
       "not a variable or static data member template specialization")((void)0);

if (VarTemplateSpecializationDecl *Spec =
        dyn_cast<VarTemplateSpecializationDecl>(this)) {
  Spec->setSpecializationKind(TSK);
  if (TSK != TSK_ExplicitSpecialization &&
      PointOfInstantiation.isValid() &&
      Spec->getPointOfInstantiation().isInvalid()) {
    Spec->setPointOfInstantiation(PointOfInstantiation);
    if (ASTMutationListener *L = getASTContext().getASTMutationListener())
      L->InstantiationRequested(this);
  }
} else if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo()) {
  MSI->setTemplateSpecializationKind(TSK);
  if (TSK != TSK_ExplicitSpecialization && PointOfInstantiation.isValid() &&
      MSI->getPointOfInstantiation().isInvalid()) {
    MSI->setPointOfInstantiation(PointOfInstantiation);
    if (ASTMutationListener *L = getASTContext().getASTMutationListener())
      L->InstantiationRequested(this);
  }
}
2719}

2721void
2722VarDecl::setInstantiationOfStaticDataMember(VarDecl *VD,
                                          TemplateSpecializationKind TSK) {
assert(getASTContext().getTemplateOrSpecializationInfo(this).isNull() &&((void)0)
       "Previous template or instantiation?")((void)0);
getASTContext().setInstantiatedFromStaticDataMember(this, VD, TSK);
2727}

2729//===----------------------------------------------------------------------===//
2730// ParmVarDecl Implementation
2731//===----------------------------------------------------------------------===//

2733ParmVarDecl *ParmVarDecl::Create(ASTContext &C, DeclContext *DC,
                               SourceLocation StartLoc,
                               SourceLocation IdLoc, IdentifierInfo *Id,
                               QualType T, TypeSourceInfo *TInfo,
                               StorageClass S, Expr *DefArg) {
return new (C, DC) ParmVarDecl(ParmVar, C, DC, StartLoc, IdLoc, Id, T, TInfo,
                               S, DefArg);
2740}

2742QualType ParmVarDecl::getOriginalType() const {
TypeSourceInfo *TSI = getTypeSourceInfo();
QualType T = TSI ? TSI->getType() : getType();
if (const auto *DT = dyn_cast<DecayedType>(T))
  return DT->getOriginalType();
return T;
2748}

2750ParmVarDecl *ParmVarDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
return new (C, ID)
    ParmVarDecl(ParmVar, C, nullptr, SourceLocation(), SourceLocation(),
                nullptr, QualType(), nullptr, SC_None, nullptr);
2754}

2756SourceRange ParmVarDecl::getSourceRange() const {
if (!hasInheritedDefaultArg()) {
  SourceRange ArgRange = getDefaultArgRange();
  if (ArgRange.isValid())
    return SourceRange(getOuterLocStart(), ArgRange.getEnd());
}

// DeclaratorDecl considers the range of postfix types as overlapping with the
// declaration name, but this is not the case with parameters in ObjC methods.
if (isa<ObjCMethodDecl>(getDeclContext()))
  return SourceRange(DeclaratorDecl::getBeginLoc(), getLocation());

return DeclaratorDecl::getSourceRange();
2769}

2771bool ParmVarDecl::isDestroyedInCallee() const {
if (hasAttr<NSConsumedAttr>())
  return true;

auto *RT = getType()->getAs<RecordType>();
if (RT && RT->getDecl()->isParamDestroyedInCallee())
  return true;

return false;
2780}

2782Expr *ParmVarDecl::getDefaultArg() {
assert(!hasUnparsedDefaultArg() && "Default argument is not yet parsed!")((void)0);
assert(!hasUninstantiatedDefaultArg() &&((void)0)
       "Default argument is not yet instantiated!")((void)0);

Expr *Arg = getInit();
if (auto *E = dyn_cast_or_null<FullExpr>(Arg))
  return E->getSubExpr();

return Arg;
2792}

2794void ParmVarDecl::setDefaultArg(Expr *defarg) {
ParmVarDeclBits.DefaultArgKind = DAK_Normal;
Init = defarg;
2797}

2799SourceRange ParmVarDecl::getDefaultArgRange() const {
switch (ParmVarDeclBits.DefaultArgKind) {
case DAK_None:
case DAK_Unparsed:
  // Nothing we can do here.
  return SourceRange();

case DAK_Uninstantiated:
  return getUninstantiatedDefaultArg()->getSourceRange();

case DAK_Normal:
  if (const Expr *E = getInit())
    return E->getSourceRange();

  // Missing an actual expression, may be invalid.
  return SourceRange();
}
llvm_unreachable("Invalid default argument kind.")__builtin_unreachable();
2817}

2819void ParmVarDecl::setUninstantiatedDefaultArg(Expr *arg) {
ParmVarDeclBits.DefaultArgKind = DAK_Uninstantiated;
Init = arg;
2822}

2824Expr *ParmVarDecl::getUninstantiatedDefaultArg() {
assert(hasUninstantiatedDefaultArg() &&((void)0)
       "Wrong kind of initialization expression!")((void)0);
return cast_or_null<Expr>(Init.get<Stmt *>());
2828}

2830bool ParmVarDecl::hasDefaultArg() const {
// FIXME: We should just return false for DAK_None here once callers are
// prepared for the case that we encountered an invalid default argument and
// were unable to even build an invalid expression.
return hasUnparsedDefaultArg() || hasUninstantiatedDefaultArg() ||
       !Init.isNull();
2836}

2838void ParmVarDecl::setParameterIndexLarge(unsigned parameterIndex) {
getASTContext().setParameterIndex(this, parameterIndex);
ParmVarDeclBits.ParameterIndex = ParameterIndexSentinel;
2841}

2843unsigned ParmVarDecl::getParameterIndexLarge() const {
return getASTContext().getParameterIndex(this);
2845}

2847//===----------------------------------------------------------------------===//
2848// FunctionDecl Implementation
2849//===----------------------------------------------------------------------===//

2851FunctionDecl::FunctionDecl(Kind DK, ASTContext &C, DeclContext *DC,
                         SourceLocation StartLoc,
                         const DeclarationNameInfo &NameInfo, QualType T,
                         TypeSourceInfo *TInfo, StorageClass S,
                         bool isInlineSpecified,
                         ConstexprSpecKind ConstexprKind,
                         Expr *TrailingRequiresClause)
  : DeclaratorDecl(DK, DC, NameInfo.getLoc(), NameInfo.getName(), T, TInfo,
                   StartLoc),
    DeclContext(DK), redeclarable_base(C), Body(), ODRHash(0),
    EndRangeLoc(NameInfo.getEndLoc()), DNLoc(NameInfo.getInfo()) {
assert(T.isNull() || T->isFunctionType())((void)0);
FunctionDeclBits.SClass = S;
FunctionDeclBits.IsInline = isInlineSpecified;
FunctionDeclBits.IsInlineSpecified = isInlineSpecified;
FunctionDeclBits.IsVirtualAsWritten = false;
FunctionDeclBits.IsPure = false;
FunctionDeclBits.HasInheritedPrototype = false;
FunctionDeclBits.HasWrittenPrototype = true;
FunctionDeclBits.IsDeleted = false;
FunctionDeclBits.IsTrivial = false;
FunctionDeclBits.IsTrivialForCall = false;
FunctionDeclBits.IsDefaulted = false;
FunctionDeclBits.IsExplicitlyDefaulted = false;
FunctionDeclBits.HasDefaultedFunctionInfo = false;
FunctionDeclBits.HasImplicitReturnZero = false;
FunctionDeclBits.IsLateTemplateParsed = false;
FunctionDeclBits.ConstexprKind = static_cast<uint64_t>(ConstexprKind);
FunctionDeclBits.InstantiationIsPending = false;
FunctionDeclBits.UsesSEHTry = false;
FunctionDeclBits.UsesFPIntrin = false;
FunctionDeclBits.HasSkippedBody = false;
FunctionDeclBits.WillHaveBody = false;
FunctionDeclBits.IsMultiVersion = false;
FunctionDeclBits.IsCopyDeductionCandidate = false;
FunctionDeclBits.HasODRHash = false;
if (TrailingRequiresClause)
  setTrailingRequiresClause(TrailingRequiresClause);
2889}

2891void FunctionDecl::getNameForDiagnostic(
  raw_ostream &OS, const PrintingPolicy &Policy, bool Qualified) const {
NamedDecl::getNameForDiagnostic(OS, Policy, Qualified);
const TemplateArgumentList *TemplateArgs = getTemplateSpecializationArgs();
if (TemplateArgs)
  printTemplateArgumentList(OS, TemplateArgs->asArray(), Policy);
2897}

2899bool FunctionDecl::isVariadic() const {
if (const auto *FT = getType()->getAs<FunctionProtoType>())
  return FT->isVariadic();
return false;
2903}

2905FunctionDecl::DefaultedFunctionInfo *
2906FunctionDecl::DefaultedFunctionInfo::Create(ASTContext &Context,
                                          ArrayRef<DeclAccessPair> Lookups) {
DefaultedFunctionInfo *Info = new (Context.Allocate(
    totalSizeToAlloc<DeclAccessPair>(Lookups.size()),
    std::max(alignof(DefaultedFunctionInfo), alignof(DeclAccessPair))))
    DefaultedFunctionInfo;
Info->NumLookups = Lookups.size();
std::uninitialized_copy(Lookups.begin(), Lookups.end(),
                        Info->getTrailingObjects<DeclAccessPair>());
return Info;
2916}

2918void FunctionDecl::setDefaultedFunctionInfo(DefaultedFunctionInfo *Info) {
assert(!FunctionDeclBits.HasDefaultedFunctionInfo && "already have this")((void)0);
assert(!Body && "can't replace function body with defaulted function info")((void)0);

FunctionDeclBits.HasDefaultedFunctionInfo = true;
DefaultedInfo = Info;
2924}

2926FunctionDecl::DefaultedFunctionInfo *
2927FunctionDecl::getDefaultedFunctionInfo() const {
return FunctionDeclBits.HasDefaultedFunctionInfo ? DefaultedInfo : nullptr;
2929}

2931bool FunctionDecl::hasBody(const FunctionDecl *&Definition) const {
for (auto I : redecls()) {
  if (I->doesThisDeclarationHaveABody()) {
    Definition = I;
    return true;
  }
}

return false;
2940}

2942bool FunctionDecl::hasTrivialBody() const {
Stmt *S = getBody();
if (!S) {
  // Since we don't have a body for this function, we don't know if it's
  // trivial or not.
  return false;
}

if (isa<CompoundStmt>(S) && cast<CompoundStmt>(S)->body_empty())
  return true;
return false;
2953}

2955bool FunctionDecl::isThisDeclarationInstantiatedFromAFriendDefinition() const {
if (!getFriendObjectKind())
  return false;

// Check for a friend function instantiated from a friend function
// definition in a templated class.
if (const FunctionDecl *InstantiatedFrom =
        getInstantiatedFromMemberFunction())
  return InstantiatedFrom->getFriendObjectKind() &&
         InstantiatedFrom->isThisDeclarationADefinition();

// Check for a friend function template instantiated from a friend
// function template definition in a templated class.
if (const FunctionTemplateDecl *Template = getDescribedFunctionTemplate()) {
  if (const FunctionTemplateDecl *InstantiatedFrom =
          Template->getInstantiatedFromMemberTemplate())
    return InstantiatedFrom->getFriendObjectKind() &&
           InstantiatedFrom->isThisDeclarationADefinition();
}

return false;
2976}

2978bool FunctionDecl::isDefined(const FunctionDecl *&Definition,
                           bool CheckForPendingFriendDefinition) const {
for (const FunctionDecl *FD : redecls()) {
  if (FD->isThisDeclarationADefinition()) {
    Definition = FD;
    return true;
  }

  // If this is a friend function defined in a class template, it does not
  // have a body until it is used, nevertheless it is a definition, see
  // [temp.inst]p2:
  //
  // ... for the purpose of determining whether an instantiated redeclaration
  // is valid according to [basic.def.odr] and [class.mem], a declaration that
  // corresponds to a definition in the template is considered to be a
  // definition.
  //
  // The following code must produce redefinition error:
  //
  //     template<typename T> struct C20 { friend void func_20() {} };
  //     C20<int> c20i;
  //     void func_20() {}
  //
  if (CheckForPendingFriendDefinition &&
      FD->isThisDeclarationInstantiatedFromAFriendDefinition()) {
    Definition = FD;
    return true;
  }
}

return false;
3009}

3011Stmt *FunctionDecl::getBody(const FunctionDecl *&Definition) const {
if (!hasBody(Definition))
  return nullptr;

assert(!Definition->FunctionDeclBits.HasDefaultedFunctionInfo &&((void)0)
       "definition should not have a body")((void)0);
if (Definition->Body)
  return Definition->Body.get(getASTContext().getExternalSource());

return nullptr;
3021}

3023void FunctionDecl::setBody(Stmt *B) {
FunctionDeclBits.HasDefaultedFunctionInfo = false;
Body = LazyDeclStmtPtr(B);
if (B)
  EndRangeLoc = B->getEndLoc();
3028}

3030void FunctionDecl::setPure(bool P) {
FunctionDeclBits.IsPure = P;
if (P)
  if (auto *Parent = dyn_cast<CXXRecordDecl>(getDeclContext()))
    Parent->markedVirtualFunctionPure();
3035}

3037template<std::size_t Len>
3038static bool isNamed(const NamedDecl *ND, const char (&Str)[Len]) {
IdentifierInfo *II = ND->getIdentifier();
return II && II->isStr(Str);
3041}

3043bool FunctionDecl::isMain() const {
const TranslationUnitDecl *tunit =
  dyn_cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext());
return tunit &&
       !tunit->getASTContext().getLangOpts().Freestanding &&
       isNamed(this, "main");
3049}

3051bool FunctionDecl::isMSVCRTEntryPoint() const {
const TranslationUnitDecl *TUnit =
    dyn_cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext());
if (!TUnit)
  return false;

// Even though we aren't really targeting MSVCRT if we are freestanding,
// semantic analysis for these functions remains the same.

// MSVCRT entry points only exist on MSVCRT targets.
if (!TUnit->getASTContext().getTargetInfo().getTriple().isOSMSVCRT())
  return false;

// Nameless functions like constructors cannot be entry points.
if (!getIdentifier())
  return false;

return llvm::StringSwitch<bool>(getName())
    .Cases("main",     // an ANSI console app
           "wmain",    // a Unicode console App
           "WinMain",  // an ANSI GUI app
           "wWinMain", // a Unicode GUI app
           "DllMain",  // a DLL
           true)
    .Default(false);
3076}

3078bool FunctionDecl::isReservedGlobalPlacementOperator() const {
assert(getDeclName().getNameKind() == DeclarationName::CXXOperatorName)((void)0);
assert(getDeclName().getCXXOverloadedOperator() == OO_New ||((void)0)
       getDeclName().getCXXOverloadedOperator() == OO_Delete ||((void)0)
       getDeclName().getCXXOverloadedOperator() == OO_Array_New ||((void)0)
       getDeclName().getCXXOverloadedOperator() == OO_Array_Delete)((void)0);

if (!getDeclContext()->getRedeclContext()->isTranslationUnit())
  return false;

const auto *proto = getType()->castAs<FunctionProtoType>();
if (proto->getNumParams() != 2 || proto->isVariadic())
  return false;

ASTContext &Context =
  cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext())
    ->getASTContext();

// The result type and first argument type are constant across all
// these operators.  The second argument must be exactly void*.
return (proto->getParamType(1).getCanonicalType() == Context.VoidPtrTy);
3099}

3101bool FunctionDecl::isReplaceableGlobalAllocationFunction(
  Optional<unsigned> *AlignmentParam, bool *IsNothrow) const {
if (getDeclName().getNameKind() != DeclarationName::CXXOperatorName)
  return false;
if (getDeclName().getCXXOverloadedOperator() != OO_New &&
    getDeclName().getCXXOverloadedOperator() != OO_Delete &&
    getDeclName().getCXXOverloadedOperator() != OO_Array_New &&
    getDeclName().getCXXOverloadedOperator() != OO_Array_Delete)
  return false;

if (isa<CXXRecordDecl>(getDeclContext()))
  return false;

// This can only fail for an invalid 'operator new' declaration.
if (!getDeclContext()->getRedeclContext()->isTranslationUnit())
  return false;

const auto *FPT = getType()->castAs<FunctionProtoType>();
if (FPT->getNumParams() == 0 || FPT->getNumParams() > 3 || FPT->isVariadic())
  return false;

// If this is a single-parameter function, it must be a replaceable global
// allocation or deallocation function.
if (FPT->getNumParams() == 1)
  return true;

unsigned Params = 1;
QualType Ty = FPT->getParamType(Params);
ASTContext &Ctx = getASTContext();

auto Consume = [&] {
  ++Params;
  Ty = Params < FPT->getNumParams() ? FPT->getParamType(Params) : QualType();
};

// In C++14, the next parameter can be a 'std::size_t' for sized delete.
bool IsSizedDelete = false;
if (Ctx.getLangOpts().SizedDeallocation &&
    (getDeclName().getCXXOverloadedOperator() == OO_Delete ||
     getDeclName().getCXXOverloadedOperator() == OO_Array_Delete) &&
    Ctx.hasSameType(Ty, Ctx.getSizeType())) {
  IsSizedDelete = true;
  Consume();
}

// In C++17, the next parameter can be a 'std::align_val_t' for aligned
// new/delete.
if (Ctx.getLangOpts().AlignedAllocation && !Ty.isNull() && Ty->isAlignValT()) {
  Consume();
  if (AlignmentParam)
    *AlignmentParam = Params;
}

// Finally, if this is not a sized delete, the final parameter can
// be a 'const std::nothrow_t&'.
if (!IsSizedDelete && !Ty.isNull() && Ty->isReferenceType()) {
  Ty = Ty->getPointeeType();
  if (Ty.getCVRQualifiers() != Qualifiers::Const)
    return false;
  if (Ty->isNothrowT()) {
    if (IsNothrow)
      *IsNothrow = true;
    Consume();
  }
}

return Params == FPT->getNumParams();
3168}

3170bool FunctionDecl::isInlineBuiltinDeclaration() const {
if (!getBuiltinID())
  return false;

const FunctionDecl *Definition;
return hasBody(Definition) && Definition->isInlineSpecified();
3176}

3178bool FunctionDecl::isDestroyingOperatorDelete() const {
// C++ P0722:
//   Within a class C, a single object deallocation function with signature
//     (T, std::destroying_delete_t, <more params>)
//   is a destroying operator delete.
if (!isa<CXXMethodDecl>(this) || getOverloadedOperator() != OO_Delete ||
    getNumParams() < 2)
  return false;

auto *RD = getParamDecl(1)->getType()->getAsCXXRecordDecl();
return RD && RD->isInStdNamespace() && RD->getIdentifier() &&
       RD->getIdentifier()->isStr("destroying_delete_t");
3190}

3192LanguageLinkage FunctionDecl::getLanguageLinkage() const {
return getDeclLanguageLinkage(*this);
3194}

3196bool FunctionDecl::isExternC() const {
return isDeclExternC(*this);
3198}

3200bool FunctionDecl::isInExternCContext() const {
if (hasAttr<OpenCLKernelAttr>())
  return true;
return getLexicalDeclContext()->isExternCContext();
3204}

3206bool FunctionDecl::isInExternCXXContext() const {
return getLexicalDeclContext()->isExternCXXContext();
3208}

3210bool FunctionDecl::isGlobal() const {
if (const auto *Method = dyn_cast<CXXMethodDecl>(this))
  return Method->isStatic();

if (getCanonicalDecl()->getStorageClass() == SC_Static)
  return false;

for (const DeclContext *DC = getDeclContext();
     DC->isNamespace();
     DC = DC->getParent()) {
  if (const auto *Namespace = cast<NamespaceDecl>(DC)) {
    if (!Namespace->getDeclName())
      return false;
    break;
  }
}

return true;
3228}

3230bool FunctionDecl::isNoReturn() const {
if (hasAttr<NoReturnAttr>() || hasAttr<CXX11NoReturnAttr>() ||
    hasAttr<C11NoReturnAttr>())
  return true;

if (auto *FnTy = getType()->getAs<FunctionType>())
  return FnTy->getNoReturnAttr();

return false;
3239}


3242MultiVersionKind FunctionDecl::getMultiVersionKind() const {
if (hasAttr<TargetAttr>())
  return MultiVersionKind::Target;
if (hasAttr<CPUDispatchAttr>())
  return MultiVersionKind::CPUDispatch;
if (hasAttr<CPUSpecificAttr>())
  return MultiVersionKind::CPUSpecific;
return MultiVersionKind::None;
3250}

3252bool FunctionDecl::isCPUDispatchMultiVersion() const {
return isMultiVersion() && hasAttr<CPUDispatchAttr>();
3254}

3256bool FunctionDecl::isCPUSpecificMultiVersion() const {
return isMultiVersion() && hasAttr<CPUSpecificAttr>();
3258}

3260bool FunctionDecl::isTargetMultiVersion() const {
return isMultiVersion() && hasAttr<TargetAttr>();
3262}

3264void
3265FunctionDecl::setPreviousDeclaration(FunctionDecl *PrevDecl) {
redeclarable_base::setPreviousDecl(PrevDecl);

if (FunctionTemplateDecl *FunTmpl = getDescribedFunctionTemplate()) {
  FunctionTemplateDecl *PrevFunTmpl
    = PrevDecl? PrevDecl->getDescribedFunctionTemplate() : nullptr;
  assert((!PrevDecl || PrevFunTmpl) && "Function/function template mismatch")((void)0);
  FunTmpl->setPreviousDecl(PrevFunTmpl);
}

if (PrevDecl && PrevDecl->isInlined())
  setImplicitlyInline(true);
3277}

3279FunctionDecl *FunctionDecl::getCanonicalDecl() { return getFirstDecl(); }

3281/// Returns a value indicating whether this function corresponds to a builtin
3282/// function.
3283///
3284/// The function corresponds to a built-in function if it is declared at
3285/// translation scope or within an extern "C" block and its name matches with
3286/// the name of a builtin. The returned value will be 0 for functions that do
3287/// not correspond to a builtin, a value of type \c Builtin::ID if in the
3288/// target-independent range \c [1,Builtin::First), or a target-specific builtin
3289/// value.
3290///
3291/// \param ConsiderWrapperFunctions If true, we should consider wrapper
3292/// functions as their wrapped builtins. This shouldn't be done in general, but
3293/// it's useful in Sema to diagnose calls to wrappers based on their semantics.
3294unsigned FunctionDecl::getBuiltinID(bool ConsiderWrapperFunctions) const {
unsigned BuiltinID = 0;

if (const auto *ABAA = getAttr<ArmBuiltinAliasAttr>()) {
  BuiltinID = ABAA->getBuiltinName()->getBuiltinID();
} else if (const auto *BAA = getAttr<BuiltinAliasAttr>()) {
  BuiltinID = BAA->getBuiltinName()->getBuiltinID();
} else if (const auto *A = getAttr<BuiltinAttr>()) {
  BuiltinID = A->getID();
}

if (!BuiltinID)
  return 0;

// If the function is marked "overloadable", it has a different mangled name
// and is not the C library function.
if (!ConsiderWrapperFunctions && hasAttr<OverloadableAttr>() &&
    (!hasAttr<ArmBuiltinAliasAttr>() && !hasAttr<BuiltinAliasAttr>()))
  return 0;

ASTContext &Context = getASTContext();
if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))
  return BuiltinID;

// This function has the name of a known C library
// function. Determine whether it actually refers to the C library
// function or whether it just has the same name.

// If this is a static function, it's not a builtin.
if (!ConsiderWrapperFunctions && getStorageClass() == SC_Static)
  return 0;

// OpenCL v1.2 s6.9.f - The library functions defined in
// the C99 standard headers are not available.
if (Context.getLangOpts().OpenCL &&
    Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))
  return 0;

// CUDA does not have device-side standard library. printf and malloc are the
// only special cases that are supported by device-side runtime.
if (Context.getLangOpts().CUDA && hasAttr<CUDADeviceAttr>() &&
    !hasAttr<CUDAHostAttr>() &&
    !(BuiltinID == Builtin::BIprintf || BuiltinID == Builtin::BImalloc))
  return 0;

// As AMDGCN implementation of OpenMP does not have a device-side standard
// library, none of the predefined library functions except printf and malloc
// should be treated as a builtin i.e. 0 should be returned for them.
if (Context.getTargetInfo().getTriple().isAMDGCN() &&
    Context.getLangOpts().OpenMPIsDevice &&
    Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID) &&
    !(BuiltinID == Builtin::BIprintf || BuiltinID == Builtin::BImalloc))
  return 0;

return BuiltinID;
3349}

3351/// getNumParams - Return the number of parameters this function must have
3352/// based on its FunctionType.  This is the length of the ParamInfo array
3353/// after it has been created.
3354unsigned FunctionDecl::getNumParams() const {
const auto *FPT = getType()->getAs<FunctionProtoType>();
return FPT ? FPT->getNumParams() : 0;
3357}

3359void FunctionDecl::setParams(ASTContext &C,
                           ArrayRef<ParmVarDecl *> NewParamInfo) {
assert(!ParamInfo && "Already has param info!")((void)0);
assert(NewParamInfo.size() == getNumParams() && "Parameter count mismatch!")((void)0);

// Zero params -> null pointer.
if (!NewParamInfo.empty()) {
  ParamInfo = new (C) ParmVarDecl*[NewParamInfo.size()];
  std::copy(NewParamInfo.begin(), NewParamInfo.end(), ParamInfo);
}
3369}

3371/// getMinRequiredArguments - Returns the minimum number of arguments
3372/// needed to call this function. This may be fewer than the number of
3373/// function parameters, if some of the parameters have default
3374/// arguments (in C++) or are parameter packs (C++11).
3375unsigned FunctionDecl::getMinRequiredArguments() const {
if (!getASTContext().getLangOpts().CPlusPlus)
  return getNumParams();

// Note that it is possible for a parameter with no default argument to
// follow a parameter with a default argument.
unsigned NumRequiredArgs = 0;
unsigned MinParamsSoFar = 0;
for (auto *Param : parameters()) {
  if (!Param->isParameterPack()) {
    ++MinParamsSoFar;
    if (!Param->hasDefaultArg())
      NumRequiredArgs = MinParamsSoFar;
  }
}
return NumRequiredArgs;
3391}

3393bool FunctionDecl::hasOneParamOrDefaultArgs() const {
return getNumParams() == 1 ||
       (getNumParams() > 1 &&
        std::all_of(param_begin() + 1, param_end(),
                    [](ParmVarDecl *P) { return P->hasDefaultArg(); }));
3398}

3400/// The combination of the extern and inline keywords under MSVC forces
3401/// the function to be required.
3402///
3403/// Note: This function assumes that we will only get called when isInlined()
3404/// would return true for this FunctionDecl.
3405bool FunctionDecl::isMSExternInline() const {
assert(isInlined() && "expected to get called on an inlined function!")((void)0);

const ASTContext &Context = getASTContext();
if (!Context.getTargetInfo().getCXXABI().isMicrosoft() &&
    !hasAttr<DLLExportAttr>())
  return false;

for (const FunctionDecl *FD = getMostRecentDecl(); FD;
     FD = FD->getPreviousDecl())
  if (!FD->isImplicit() && FD->getStorageClass() == SC_Extern)
    return true;

return false;
3419}

3421static bool redeclForcesDefMSVC(const FunctionDecl *Redecl) {
if (Redecl->getStorageClass() != SC_Extern)
  return false;

for (const FunctionDecl *FD = Redecl->getPreviousDecl(); FD;
     FD = FD->getPreviousDecl())
  if (!FD->isImplicit() && FD->getStorageClass() == SC_Extern)
    return false;

return true;
3431}

3433static bool RedeclForcesDefC99(const FunctionDecl *Redecl) {
// Only consider file-scope declarations in this test.
if (!Redecl->getLexicalDeclContext()->isTranslationUnit())
  return false;

// Only consider explicit declarations; the presence of a builtin for a
// libcall shouldn't affect whether a definition is externally visible.
if (Redecl->isImplicit())
  return false;

if (!Redecl->isInlineSpecified() || Redecl->getStorageClass() == SC_Extern)
  return true; // Not an inline definition

return false;
3447}

3449/// For a function declaration in C or C++, determine whether this
3450/// declaration causes the definition to be externally visible.
3451///
3452/// For instance, this determines if adding the current declaration to the set
3453/// of redeclarations of the given functions causes
3454/// isInlineDefinitionExternallyVisible to change from false to true.
3455bool FunctionDecl::doesDeclarationForceExternallyVisibleDefinition() const {
assert(!doesThisDeclarationHaveABody() &&((void)0)
       "Must have a declaration without a body.")((void)0);

ASTContext &Context = getASTContext();

if (Context.getLangOpts().MSVCCompat) {
  const FunctionDecl *Definition;
  if (hasBody(Definition) && Definition->isInlined() &&
      redeclForcesDefMSVC(this))
    return true;
}

if (Context.getLangOpts().CPlusPlus)
  return false;

if (Context.getLangOpts().GNUInline || hasAttr<GNUInlineAttr>()) {
  // With GNU inlining, a declaration with 'inline' but not 'extern', forces
  // an externally visible definition.
  //
  // FIXME: What happens if gnu_inline gets added on after the first
  // declaration?
  if (!isInlineSpecified() || getStorageClass() == SC_Extern)
    return false;

  const FunctionDecl *Prev = this;
  bool FoundBody = false;
  while ((Prev = Prev->getPreviousDecl())) {
    FoundBody |= Prev->doesThisDeclarationHaveABody();

    if (Prev->doesThisDeclarationHaveABody()) {
      // If it's not the case that both 'inline' and 'extern' are
      // specified on the definition, then it is always externally visible.
      if (!Prev->isInlineSpecified() ||
          Prev->getStorageClass() != SC_Extern)
        return false;
    } else if (Prev->isInlineSpecified() &&
               Prev->getStorageClass() != SC_Extern) {
      return false;
    }
  }
  return FoundBody;
}

// C99 6.7.4p6:
//   [...] If all of the file scope declarations for a function in a
//   translation unit include the inline function specifier without extern,
//   then the definition in that translation unit is an inline definition.
if (isInlineSpecified() && getStorageClass() != SC_Extern)
  return false;
const FunctionDecl *Prev = this;
bool FoundBody = false;
while ((Prev = Prev->getPreviousDecl())) {
  FoundBody |= Prev->doesThisDeclarationHaveABody();
  if (RedeclForcesDefC99(Prev))
    return false;
}
return FoundBody;
3513}

3515FunctionTypeLoc FunctionDecl::getFunctionTypeLoc() const {
const TypeSourceInfo *TSI = getTypeSourceInfo();
return TSI ? TSI->getTypeLoc().IgnoreParens().getAs<FunctionTypeLoc>()
           : FunctionTypeLoc();
3519}

3521SourceRange FunctionDecl::getReturnTypeSourceRange() const {
FunctionTypeLoc FTL = getFunctionTypeLoc();
if (!FTL)
  return SourceRange();

// Skip self-referential return types.
const SourceManager &SM = getASTContext().getSourceManager();
SourceRange RTRange = FTL.getReturnLoc().getSourceRange();
SourceLocation Boundary = getNameInfo().getBeginLoc();
if (RTRange.isInvalid() || Boundary.isInvalid() ||
    !SM.isBeforeInTranslationUnit(RTRange.getEnd(), Boundary))
  return SourceRange();

return RTRange;
3535}

3537SourceRange FunctionDecl::getParametersSourceRange() const {
unsigned NP = getNumParams();
SourceLocation EllipsisLoc = getEllipsisLoc();

if (NP == 0 && EllipsisLoc.isInvalid())
  return SourceRange();

SourceLocation Begin =
    NP > 0 ? ParamInfo[0]->getSourceRange().getBegin() : EllipsisLoc;
SourceLocation End = EllipsisLoc.isValid()
                         ? EllipsisLoc
                         : ParamInfo[NP - 1]->getSourceRange().getEnd();

return SourceRange(Begin, End);
3551}

3553SourceRange FunctionDecl::getExceptionSpecSourceRange() const {
FunctionTypeLoc FTL = getFunctionTypeLoc();
return FTL ? FTL.getExceptionSpecRange() : SourceRange();
3556}

3558/// For an inline function definition in C, or for a gnu_inline function
3559/// in C++, determine whether the definition will be externally visible.
3560///
3561/// Inline function definitions are always available for inlining optimizations.
3562/// However, depending on the language dialect, declaration specifiers, and
3563/// attributes, the definition of an inline function may or may not be
3564/// "externally" visible to other translation units in the program.
3565///
3566/// In C99, inline definitions are not externally visible by default. However,
3567/// if even one of the global-scope declarations is marked "extern inline", the
3568/// inline definition becomes externally visible (C99 6.7.4p6).
3569///
3570/// In GNU89 mode, or if the gnu_inline attribute is attached to the function
3571/// definition, we use the GNU semantics for inline, which are nearly the
3572/// opposite of C99 semantics. In particular, "inline" by itself will create
3573/// an externally visible symbol, but "extern inline" will not create an
3574/// externally visible symbol.
3575bool FunctionDecl::isInlineDefinitionExternallyVisible() const {
assert((doesThisDeclarationHaveABody() || willHaveBody() ||((void)0)
        hasAttr<AliasAttr>()) &&((void)0)
       "Must be a function definition")((void)0);
assert(isInlined() && "Function must be inline")((void)0);
ASTContext &Context = getASTContext();

if (Context.getLangOpts().GNUInline || hasAttr<GNUInlineAttr>()) {
  // Note: If you change the logic here, please change
  // doesDeclarationForceExternallyVisibleDefinition as well.
  //
  // If it's not the case that both 'inline' and 'extern' are
  // specified on the definition, then this inline definition is
  // externally visible.
  if (Context.getLangOpts().CPlusPlus)
    return false;
  if (!(isInlineSpecified() && getStorageClass() == SC_Extern))
    return true;

  // If any declaration is 'inline' but not 'extern', then this definition
  // is externally visible.
  for (auto Redecl : redecls()) {
    if (Redecl->isInlineSpecified() &&
        Redecl->getStorageClass() != SC_Extern)
      return true;
  }

  return false;
}

// The rest of this function is C-only.
assert(!Context.getLangOpts().CPlusPlus &&((void)0)
       "should not use C inline rules in C++")((void)0);

// C99 6.7.4p6:
//   [...] If all of the file scope declarations for a function in a
//   translation unit include the inline function specifier without extern,
//   then the definition in that translation unit is an inline definition.
for (auto Redecl : redecls()) {
  if (RedeclForcesDefC99(Redecl))
    return true;
}

// C99 6.7.4p6:
//   An inline definition does not provide an external definition for the
//   function, and does not forbid an external definition in another
//   translation unit.
return false;
3623}

3625/// getOverloadedOperator - Which C++ overloaded operator this
3626/// function represents, if any.
3627OverloadedOperatorKind FunctionDecl::getOverloadedOperator() const {
if (getDeclName().getNameKind() == DeclarationName::CXXOperatorName)
  return getDeclName().getCXXOverloadedOperator();
return OO_None;
3631}

3633/// getLiteralIdentifier - The literal suffix identifier this function
3634/// represents, if any.
3635const IdentifierInfo *FunctionDecl::getLiteralIdentifier() const {
if (getDeclName().getNameKind() == DeclarationName::CXXLiteralOperatorName)
  return getDeclName().getCXXLiteralIdentifier();
return nullptr;
3639}

3641FunctionDecl::TemplatedKind FunctionDecl::getTemplatedKind() const {
if (TemplateOrSpecialization.isNull())
  return TK_NonTemplate;
if (TemplateOrSpecialization.is<FunctionTemplateDecl *>())
  return TK_FunctionTemplate;
if (TemplateOrSpecialization.is<MemberSpecializationInfo *>())
  return TK_MemberSpecialization;
if (TemplateOrSpecialization.is<FunctionTemplateSpecializationInfo *>())
  return TK_FunctionTemplateSpecialization;
if (TemplateOrSpecialization.is
                             <DependentFunctionTemplateSpecializationInfo*>())
  return TK_DependentFunctionTemplateSpecialization;

llvm_unreachable("Did we miss a TemplateOrSpecialization type?")__builtin_unreachable();
3655}

3657FunctionDecl *FunctionDecl::getInstantiatedFromMemberFunction() const {
if (MemberSpecializationInfo *Info = getMemberSpecializationInfo())
  return cast<FunctionDecl>(Info->getInstantiatedFrom());

return nullptr;
3662}

3664MemberSpecializationInfo *FunctionDecl::getMemberSpecializationInfo() const {
if (auto *MSI =
        TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
  return MSI;
if (auto *FTSI = TemplateOrSpecialization
                     .dyn_cast<FunctionTemplateSpecializationInfo *>())
  return FTSI->getMemberSpecializationInfo();
return nullptr;
3672}

3674void
3675FunctionDecl::setInstantiationOfMemberFunction(ASTContext &C,
                                             FunctionDecl *FD,
                                             TemplateSpecializationKind TSK) {
assert(TemplateOrSpecialization.isNull() &&((void)0)
       "Member function is already a specialization")((void)0);
MemberSpecializationInfo *Info
  = new (C) MemberSpecializationInfo(FD, TSK);
TemplateOrSpecialization = Info;
3683}

3685FunctionTemplateDecl *FunctionDecl::getDescribedFunctionTemplate() const {
return TemplateOrSpecialization.dyn_cast<FunctionTemplateDecl *>();
3687}

3689void FunctionDecl::setDescribedFunctionTemplate(FunctionTemplateDecl *Template) {
assert(TemplateOrSpecialization.isNull() &&((void)0)
       "Member function is already a specialization")((void)0);
TemplateOrSpecialization = Template;
3693}

3695bool FunctionDecl::isImplicitlyInstantiable() const {
// If the function is invalid, it can't be implicitly instantiated.
if (isInvalidDecl())
  return false;

switch (getTemplateSpecializationKindForInstantiation()) {
case TSK_Undeclared:
case TSK_ExplicitInstantiationDefinition:
case TSK_ExplicitSpecialization:
  return false;

case TSK_ImplicitInstantiation:
  return true;

case TSK_ExplicitInstantiationDeclaration:
  // Handled below.
  break;
}

// Find the actual template from which we will instantiate.
const FunctionDecl *PatternDecl = getTemplateInstantiationPattern();
bool HasPattern = false;
if (PatternDecl)
  HasPattern = PatternDecl->hasBody(PatternDecl);

// C++0x [temp.explicit]p9:
//   Except for inline functions, other explicit instantiation declarations
//   have the effect of suppressing the implicit instantiation of the entity
//   to which they refer.
if (!HasPattern || !PatternDecl)
  return true;

return PatternDecl->isInlined();
3728}

3730bool FunctionDecl::isTemplateInstantiation() const {
// FIXME: Remove this, it's not clear what it means. (Which template
// specialization kind?)
return clang::isTemplateInstantiation(getTemplateSpecializationKind());
3734}

3736FunctionDecl *
3737FunctionDecl::getTemplateInstantiationPattern(bool ForDefinition) const {
// If this is a generic lambda call operator specialization, its
// instantiation pattern is always its primary template's pattern
// even if its primary template was instantiated from another
// member template (which happens with nested generic lambdas).
// Since a lambda's call operator's body is transformed eagerly,
// we don't have to go hunting for a prototype definition template
// (i.e. instantiated-from-member-template) to use as an instantiation
// pattern.

if (isGenericLambdaCallOperatorSpecialization(
        dyn_cast<CXXMethodDecl>(this))) {
  assert(getPrimaryTemplate() && "not a generic lambda call operator?")((void)0);
  return getDefinitionOrSelf(getPrimaryTemplate()->getTemplatedDecl());
}

// Check for a declaration of this function that was instantiated from a
// friend definition.
const FunctionDecl *FD = nullptr;
if (!isDefined(FD, /*CheckForPendingFriendDefinition=*/true))
  FD = this;

if (MemberSpecializationInfo *Info = FD->getMemberSpecializationInfo()) {
  if (ForDefinition &&
      !clang::isTemplateInstantiation(Info->getTemplateSpecializationKind()))
    return nullptr;
  return getDefinitionOrSelf(cast<FunctionDecl>(Info->getInstantiatedFrom()));
}

if (ForDefinition &&
    !clang::isTemplateInstantiation(getTemplateSpecializationKind()))
  return nullptr;

if (FunctionTemplateDecl *Primary = getPrimaryTemplate()) {
  // If we hit a point where the user provided a specialization of this
  // template, we're done looking.
  while (!ForDefinition || !Primary->isMemberSpecialization()) {
    auto *NewPrimary = Primary->getInstantiatedFromMemberTemplate();
    if (!NewPrimary)
      break;
    Primary = NewPrimary;
  }

  return getDefinitionOrSelf(Primary->getTemplatedDecl());
}

return nullptr;
3784}

3786FunctionTemplateDecl *FunctionDecl::getPrimaryTemplate() const {
if (FunctionTemplateSpecializationInfo *Info
      = TemplateOrSpecialization
          .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
  return Info->getTemplate();
}
return nullptr;
3793}

3795FunctionTemplateSpecializationInfo *
3796FunctionDecl::getTemplateSpecializationInfo() const {
return TemplateOrSpecialization
    .dyn_cast<FunctionTemplateSpecializationInfo *>();
3799}

3801const TemplateArgumentList *
3802FunctionDecl::getTemplateSpecializationArgs() const {
if (FunctionTemplateSpecializationInfo *Info
      = TemplateOrSpecialization
          .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
  return Info->TemplateArguments;
}
return nullptr;
3809}

3811const ASTTemplateArgumentListInfo *
3812FunctionDecl::getTemplateSpecializationArgsAsWritten() const {
if (FunctionTemplateSpecializationInfo *Info
      = TemplateOrSpecialization
          .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
  return Info->TemplateArgumentsAsWritten;
}
return nullptr;
3819}

3821void
3822FunctionDecl::setFunctionTemplateSpecialization(ASTContext &C,
                                              FunctionTemplateDecl *Template,
                                   const TemplateArgumentList *TemplateArgs,
                                              void *InsertPos,
                                              TemplateSpecializationKind TSK,
                      const TemplateArgumentListInfo *TemplateArgsAsWritten,
                                        SourceLocation PointOfInstantiation) {
assert((TemplateOrSpecialization.isNull() ||((void)0)
        TemplateOrSpecialization.is<MemberSpecializationInfo *>()) &&((void)0)
       "Member function is already a specialization")((void)0);
assert(TSK != TSK_Undeclared &&((void)0)
       "Must specify the type of function template specialization")((void)0);
assert((TemplateOrSpecialization.isNull() ||((void)0)
        TSK == TSK_ExplicitSpecialization) &&((void)0)
       "Member specialization must be an explicit specialization")((void)0);
FunctionTemplateSpecializationInfo *Info =
    FunctionTemplateSpecializationInfo::Create(
        C, this, Template, TSK, TemplateArgs, TemplateArgsAsWritten,
        PointOfInstantiation,
        TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>());
TemplateOrSpecialization = Info;
Template->addSpecialization(Info, InsertPos);
3844}

3846void
3847FunctionDecl::setDependentTemplateSpecialization(ASTContext &Context,
                                  const UnresolvedSetImpl &Templates,
                           const TemplateArgumentListInfo &TemplateArgs) {
assert(TemplateOrSpecialization.isNull())((void)0);
DependentFunctionTemplateSpecializationInfo *Info =
    DependentFunctionTemplateSpecializationInfo::Create(Context, Templates,
1
Calling 'DependentFunctionTemplateSpecializationInfo::Create'→
                                                        TemplateArgs);
TemplateOrSpecialization = Info;
3855}

3857DependentFunctionTemplateSpecializationInfo *
3858FunctionDecl::getDependentSpecializationInfo() const {
return TemplateOrSpecialization
    .dyn_cast<DependentFunctionTemplateSpecializationInfo *>();
3861}

3863DependentFunctionTemplateSpecializationInfo *
3864DependentFunctionTemplateSpecializationInfo::Create(
  ASTContext &Context, const UnresolvedSetImpl &Ts,
  const TemplateArgumentListInfo &TArgs) {
void *Buffer = Context.Allocate(
    totalSizeToAlloc<TemplateArgumentLoc, FunctionTemplateDecl *>(
        TArgs.size(), Ts.size()));
return new (Buffer) DependentFunctionTemplateSpecializationInfo(Ts, TArgs);
2
←
Calling constructor for 'DependentFunctionTemplateSpecializationInfo'→
3871}

3873DependentFunctionTemplateSpecializationInfo::
3874DependentFunctionTemplateSpecializationInfo(const UnresolvedSetImpl &Ts,
                                    const TemplateArgumentListInfo &TArgs)
: AngleLocs(TArgs.getLAngleLoc(), TArgs.getRAngleLoc()) {
NumTemplates = Ts.size();
NumArgs = TArgs.size();

FunctionTemplateDecl **TsArray = getTrailingObjects<FunctionTemplateDecl *>();
for (unsigned I = 0, E = Ts.size(); I != E; ++I)
3
←
Assuming 'I' is equal to 'E'→
4
←
Loop condition is false. Execution continues on line 3884→
  TsArray[I] = cast<FunctionTemplateDecl>(Ts[I]->getUnderlyingDecl());

TemplateArgumentLoc *ArgsArray = getTrailingObjects<TemplateArgumentLoc>();
5
←
Calling 'TrailingObjects::getTrailingObjects'→
14
←
Returning from 'TrailingObjects::getTrailingObjects'→
15
←
'ArgsArray' initialized here→
for (unsigned I = 0, E = TArgs.size(); I != E; ++I)
16
←
Assuming 'I' is not equal to 'E'→
17
←
Loop condition is true.  Entering loop body→
  new (&ArgsArray[I]) TemplateArgumentLoc(TArgs[I]);
18
←
Storage provided to placement new is only 0 bytes, whereas the allocated type requires 32 bytes
3887}

3889TemplateSpecializationKind FunctionDecl::getTemplateSpecializationKind() const {
// For a function template specialization, query the specialization
// information object.
if (FunctionTemplateSpecializationInfo *FTSInfo =
        TemplateOrSpecialization
            .dyn_cast<FunctionTemplateSpecializationInfo *>())
  return FTSInfo->getTemplateSpecializationKind();

if (MemberSpecializationInfo *MSInfo =
        TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
  return MSInfo->getTemplateSpecializationKind();

return TSK_Undeclared;
3902}

3904TemplateSpecializationKind
3905FunctionDecl::getTemplateSpecializationKindForInstantiation() const {
// This is the same as getTemplateSpecializationKind(), except that for a
// function that is both a function template specialization and a member
// specialization, we prefer the member specialization information. Eg:
//
// template<typename T> struct A {
//   template<typename U> void f() {}
//   template<> void f<int>() {}
// };
//
// For A<int>::f<int>():
// * getTemplateSpecializationKind() will return TSK_ExplicitSpecialization
// * getTemplateSpecializationKindForInstantiation() will return
//       TSK_ImplicitInstantiation
//
// This reflects the facts that A<int>::f<int> is an explicit specialization
// of A<int>::f, and that A<int>::f<int> should be implicitly instantiated
// from A::f<int> if a definition is needed.
if (FunctionTemplateSpecializationInfo *FTSInfo =
        TemplateOrSpecialization
            .dyn_cast<FunctionTemplateSpecializationInfo *>()) {
  if (auto *MSInfo = FTSInfo->getMemberSpecializationInfo())
    return MSInfo->getTemplateSpecializationKind();
  return FTSInfo->getTemplateSpecializationKind();
}

if (MemberSpecializationInfo *MSInfo =
        TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
  return MSInfo->getTemplateSpecializationKind();

return TSK_Undeclared;
3936}

3938void
3939FunctionDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
                                        SourceLocation PointOfInstantiation) {
if (FunctionTemplateSpecializationInfo *FTSInfo
      = TemplateOrSpecialization.dyn_cast<
                                  FunctionTemplateSpecializationInfo*>()) {
  FTSInfo->setTemplateSpecializationKind(TSK);
  if (TSK != TSK_ExplicitSpecialization &&
      PointOfInstantiation.isValid() &&
      FTSInfo->getPointOfInstantiation().isInvalid()) {
    FTSInfo->setPointOfInstantiation(PointOfInstantiation);
    if (ASTMutationListener *L = getASTContext().getASTMutationListener())
      L->InstantiationRequested(this);
  }
} else if (MemberSpecializationInfo *MSInfo
           = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>()) {
  MSInfo->setTemplateSpecializationKind(TSK);
  if (TSK != TSK_ExplicitSpecialization &&
      PointOfInstantiation.isValid() &&
      MSInfo->getPointOfInstantiation().isInvalid()) {
    MSInfo->setPointOfInstantiation(PointOfInstantiation);
    if (ASTMutationListener *L = getASTContext().getASTMutationListener())
      L->InstantiationRequested(this);
  }
} else
  llvm_unreachable("Function cannot have a template specialization kind")__builtin_unreachable();
3964}

3966SourceLocation FunctionDecl::getPointOfInstantiation() const {
if (FunctionTemplateSpecializationInfo *FTSInfo
      = TemplateOrSpecialization.dyn_cast<
                                      FunctionTemplateSpecializationInfo*>())
  return FTSInfo->getPointOfInstantiation();
if (MemberSpecializationInfo *MSInfo =
        TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
  return MSInfo->getPointOfInstantiation();

return SourceLocation();
3976}

3978bool FunctionDecl::isOutOfLine() const {
if (Decl::isOutOfLine())
  return true;

// If this function was instantiated from a member function of a
// class template, check whether that member function was defined out-of-line.
if (FunctionDecl *FD = getInstantiatedFromMemberFunction()) {
  const FunctionDecl *Definition;
  if (FD->hasBody(Definition))
    return Definition->isOutOfLine();
}

// If this function was instantiated from a function template,
// check whether that function template was defined out-of-line.
if (FunctionTemplateDecl *FunTmpl = getPrimaryTemplate()) {
  const FunctionDecl *Definition;
  if (FunTmpl->getTemplatedDecl()->hasBody(Definition))
    return Definition->isOutOfLine();
}

return false;
3999}

4001SourceRange FunctionDecl::getSourceRange() const {
return SourceRange(getOuterLocStart(), EndRangeLoc);
4003}

4005unsigned FunctionDecl::getMemoryFunctionKind() const {
IdentifierInfo *FnInfo = getIdentifier();

if (!FnInfo)
  return 0;

// Builtin handling.
switch (getBuiltinID()) {
case Builtin::BI__builtin_memset:
case Builtin::BI__builtin___memset_chk:
case Builtin::BImemset:
  return Builtin::BImemset;

case Builtin::BI__builtin_memcpy:
case Builtin::BI__builtin___memcpy_chk:
case Builtin::BImemcpy:
  return Builtin::BImemcpy;

case Builtin::BI__builtin_mempcpy:
case Builtin::BI__builtin___mempcpy_chk:
case Builtin::BImempcpy:
  return Builtin::BImempcpy;

case Builtin::BI__builtin_memmove:
case Builtin::BI__builtin___memmove_chk:
case Builtin::BImemmove:
  return Builtin::BImemmove;

case Builtin::BIstrlcpy:
case Builtin::BI__builtin___strlcpy_chk:
  return Builtin::BIstrlcpy;

case Builtin::BIstrlcat:
case Builtin::BI__builtin___strlcat_chk:
  return Builtin::BIstrlcat;

case Builtin::BI__builtin_memcmp:
case Builtin::BImemcmp:
  return Builtin::BImemcmp;

case Builtin::BI__builtin_bcmp:
case Builtin::BIbcmp:
  return Builtin::BIbcmp;

case Builtin::BI__builtin_strncpy:
case Builtin::BI__builtin___strncpy_chk:
case Builtin::BIstrncpy:
  return Builtin::BIstrncpy;

case Builtin::BI__builtin_strncmp:
case Builtin::BIstrncmp:
  return Builtin::BIstrncmp;

case Builtin::BI__builtin_strncasecmp:
case Builtin::BIstrncasecmp:
  return Builtin::BIstrncasecmp;

case Builtin::BI__builtin_strncat:
case Builtin::BI__builtin___strncat_chk:
case Builtin::BIstrncat:
  return Builtin::BIstrncat;

case Builtin::BI__builtin_strndup:
case Builtin::BIstrndup:
  return Builtin::BIstrndup;

case Builtin::BI__builtin_strlen:
case Builtin::BIstrlen:
  return Builtin::BIstrlen;

case Builtin::BI__builtin_bzero:
case Builtin::BIbzero:
  return Builtin::BIbzero;

case Builtin::BIfree:
  return Builtin::BIfree;

default:
  if (isExternC()) {
    if (FnInfo->isStr("memset"))
      return Builtin::BImemset;
    if (FnInfo->isStr("memcpy"))
      return Builtin::BImemcpy;
    if (FnInfo->isStr("mempcpy"))
      return Builtin::BImempcpy;
    if (FnInfo->isStr("memmove"))
      return Builtin::BImemmove;
    if (FnInfo->isStr("memcmp"))
      return Builtin::BImemcmp;
    if (FnInfo->isStr("bcmp"))
      return Builtin::BIbcmp;
    if (FnInfo->isStr("strncpy"))
      return Builtin::BIstrncpy;
    if (FnInfo->isStr("strncmp"))
      return Builtin::BIstrncmp;
    if (FnInfo->isStr("strncasecmp"))
      return Builtin::BIstrncasecmp;
    if (FnInfo->isStr("strncat"))
      return Builtin::BIstrncat;
    if (FnInfo->isStr("strndup"))
      return Builtin::BIstrndup;
    if (FnInfo->isStr("strlen"))
      return Builtin::BIstrlen;
    if (FnInfo->isStr("bzero"))
      return Builtin::BIbzero;
  } else if (isInStdNamespace()) {
    if (FnInfo->isStr("free"))
      return Builtin::BIfree;
  }
  break;
}
return 0;
4117}

4119unsigned FunctionDecl::getODRHash() const {
assert(hasODRHash())((void)0);
return ODRHash;
4122}

4124unsigned FunctionDecl::getODRHash() {
if (hasODRHash())
  return ODRHash;

if (auto *FT = getInstantiatedFromMemberFunction()) {
  setHasODRHash(true);
  ODRHash = FT->getODRHash();
  return ODRHash;
}

class ODRHash Hash;
Hash.AddFunctionDecl(this);
setHasODRHash(true);
ODRHash = Hash.CalculateHash();
return ODRHash;
4139}

4141//===----------------------------------------------------------------------===//
4142// FieldDecl Implementation
4143//===----------------------------------------------------------------------===//

4145FieldDecl *FieldDecl::Create(const ASTContext &C, DeclContext *DC,
                           SourceLocation StartLoc, SourceLocation IdLoc,
                           IdentifierInfo *Id, QualType T,
                           TypeSourceInfo *TInfo, Expr *BW, bool Mutable,
                           InClassInitStyle InitStyle) {
return new (C, DC) FieldDecl(Decl::Field, DC, StartLoc, IdLoc, Id, T, TInfo,
                             BW, Mutable, InitStyle);
4152}

4154FieldDecl *FieldDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
return new (C, ID) FieldDecl(Field, nullptr, SourceLocation(),
                             SourceLocation(), nullptr, QualType(), nullptr,
                             nullptr, false, ICIS_NoInit);
4158}

4160bool FieldDecl::isAnonymousStructOrUnion() const {
if (!isImplicit() || getDeclName())
  return false;

if (const auto *Record = getType()->getAs<RecordType>())
  return Record->getDecl()->isAnonymousStructOrUnion();

return false;
4168}

4170unsigned FieldDecl::getBitWidthValue(const ASTContext &Ctx) const {
assert(isBitField() && "not a bitfield")((void)0);
return getBitWidth()->EvaluateKnownConstInt(Ctx).getZExtValue();
4173}

4175bool FieldDecl::isZeroLengthBitField(const ASTContext &Ctx) const {
return isUnnamedBitfield() && !getBitWidth()->isValueDependent() &&
       getBitWidthValue(Ctx) == 0;
4178}

4180bool FieldDecl::isZeroSize(const ASTContext &Ctx) const {
if (isZeroLengthBitField(Ctx))
  return true;

// C++2a [intro.object]p7:
//   An object has nonzero size if it
//     -- is not a potentially-overlapping subobject, or
if (!hasAttr<NoUniqueAddressAttr>())
  return false;

//     -- is not of class type, or
const auto *RT = getType()->getAs<RecordType>();
if (!RT)
  return false;
const RecordDecl *RD = RT->getDecl()->getDefinition();
if (!RD) {
  assert(isInvalidDecl() && "valid field has incomplete type")((void)0);
  return false;
}

//     -- [has] virtual member functions or virtual base classes, or
//     -- has subobjects of nonzero size or bit-fields of nonzero length
const auto *CXXRD = cast<CXXRecordDecl>(RD);
if (!CXXRD->isEmpty())
  return false;

// Otherwise, [...] the circumstances under which the object has zero size
// are implementation-defined.
// FIXME: This might be Itanium ABI specific; we don't yet know what the MS
// ABI will do.
return true;
4211}

4213unsigned FieldDecl::getFieldIndex() const {
const FieldDecl *Canonical = getCanonicalDecl();
if (Canonical != this)
  return Canonical->getFieldIndex();

if (CachedFieldIndex) return CachedFieldIndex - 1;

unsigned Index = 0;
const RecordDecl *RD = getParent()->getDefinition();
assert(RD && "requested index for field of struct with no definition")((void)0);

for (auto *Field : RD->fields()) {
  Field->getCanonicalDecl()->CachedFieldIndex = Index + 1;
  ++Index;
}

assert(CachedFieldIndex && "failed to find field in parent")((void)0);
return CachedFieldIndex - 1;
4231}

4233SourceRange FieldDecl::getSourceRange() const {
const Expr *FinalExpr = getInClassInitializer();
if (!FinalExpr)
  FinalExpr = getBitWidth();
if (FinalExpr)
  return SourceRange(getInnerLocStart(), FinalExpr->getEndLoc());
return DeclaratorDecl::getSourceRange();
4240}

4242void FieldDecl::setCapturedVLAType(const VariableArrayType *VLAType) {
assert((getParent()->isLambda() || getParent()->isCapturedRecord()) &&((void)0)
       "capturing type in non-lambda or captured record.")((void)0);
assert(InitStorage.getInt() == ISK_NoInit &&((void)0)
       InitStorage.getPointer() == nullptr &&((void)0)
       "bit width, initializer or captured type already set")((void)0);
InitStorage.setPointerAndInt(const_cast<VariableArrayType *>(VLAType),
                             ISK_CapturedVLAType);
4250}

4252//===----------------------------------------------------------------------===//
4253// TagDecl Implementation
4254//===----------------------------------------------------------------------===//

4256TagDecl::TagDecl(Kind DK, TagKind TK, const ASTContext &C, DeclContext *DC,
               SourceLocation L, IdentifierInfo *Id, TagDecl *PrevDecl,
               SourceLocation StartL)
  : TypeDecl(DK, DC, L, Id, StartL), DeclContext(DK), redeclarable_base(C),
    TypedefNameDeclOrQualifier((TypedefNameDecl *)nullptr) {
assert((DK != Enum || TK == TTK_Enum) &&((void)0)
       "EnumDecl not matched with TTK_Enum")((void)0);
setPreviousDecl(PrevDecl);
setTagKind(TK);
setCompleteDefinition(false);
setBeingDefined(false);
setEmbeddedInDeclarator(false);
setFreeStanding(false);
setCompleteDefinitionRequired(false);
4270}

4272SourceLocation TagDecl::getOuterLocStart() const {
return getTemplateOrInnerLocStart(this);
4274}

4276SourceRange TagDecl::getSourceRange() const {
SourceLocation RBraceLoc = BraceRange.getEnd();
SourceLocation E = RBraceLoc.isValid() ? RBraceLoc : getLocation();
return SourceRange(getOuterLocStart(), E);
4280}

4282TagDecl *TagDecl::getCanonicalDecl() { return getFirstDecl(); }

4284void TagDecl::setTypedefNameForAnonDecl(TypedefNameDecl *TDD) {
TypedefNameDeclOrQualifier = TDD;
if (const Type *T = getTypeForDecl()) {
  (void)T;
  assert(T->isLinkageValid())((void)0);
}
assert(isLinkageValid())((void)0);
4291}

4293void TagDecl::startDefinition() {
setBeingDefined(true);

if (auto *D = dyn_cast<CXXRecordDecl>(this)) {
  struct CXXRecordDecl::DefinitionData *Data =
    new (getASTContext()) struct CXXRecordDecl::DefinitionData(D);
  for (auto I : redecls())
    cast<CXXRecordDecl>(I)->DefinitionData = Data;
}
4302}

4304void TagDecl::completeDefinition() {
assert((!isa<CXXRecordDecl>(this) ||((void)0)
        cast<CXXRecordDecl>(this)->hasDefinition()) &&((void)0)
       "definition completed but not started")((void)0);

setCompleteDefinition(true);
setBeingDefined(false);

if (ASTMutationListener *L = getASTMutationListener())
  L->CompletedTagDefinition(this);
4314}

4316TagDecl *TagDecl::getDefinition() const {
if (isCompleteDefinition())
  return const_cast<TagDecl *>(this);

// If it's possible for us to have an out-of-date definition, check now.
if (mayHaveOutOfDateDef()) {
  if (IdentifierInfo *II = getIdentifier()) {
    if (II->isOutOfDate()) {
      updateOutOfDate(*II);
    }
  }
}

if (const auto *CXXRD = dyn_cast<CXXRecordDecl>(this))
  return CXXRD->getDefinition();

for (auto R : redecls())
  if (R->isCompleteDefinition())
    return R;

return nullptr;
4337}

4339void TagDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) {
if (QualifierLoc) {
  // Make sure the extended qualifier info is allocated.
  if (!hasExtInfo())
    TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo;
  // Set qualifier info.
  getExtInfo()->QualifierLoc = QualifierLoc;
} else {
  // Here Qualifier == 0, i.e., we are removing the qualifier (if any).
  if (hasExtInfo()) {
    if (getExtInfo()->NumTemplParamLists == 0) {
      getASTContext().Deallocate(getExtInfo());
      TypedefNameDeclOrQualifier = (TypedefNameDecl *)nullptr;
    }
    else
      getExtInfo()->QualifierLoc = QualifierLoc;
  }
}
4357}

4359void TagDecl::setTemplateParameterListsInfo(
  ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
assert(!TPLists.empty())((void)0);
// Make sure the extended decl info is allocated.
if (!hasExtInfo())
  // Allocate external info struct.
  TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo;
// Set the template parameter lists info.
getExtInfo()->setTemplateParameterListsInfo(Context, TPLists);
4368}

4370//===----------------------------------------------------------------------===//
4371// EnumDecl Implementation
4372//===----------------------------------------------------------------------===//

4374EnumDecl::EnumDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
                 SourceLocation IdLoc, IdentifierInfo *Id, EnumDecl *PrevDecl,
                 bool Scoped, bool ScopedUsingClassTag, bool Fixed)
  : TagDecl(Enum, TTK_Enum, C, DC, IdLoc, Id, PrevDecl, StartLoc) {
assert(Scoped || !ScopedUsingClassTag)((void)0);
IntegerType = nullptr;
setNumPositiveBits(0);
setNumNegativeBits(0);
setScoped(Scoped);
setScopedUsingClassTag(ScopedUsingClassTag);
setFixed(Fixed);
setHasODRHash(false);
ODRHash = 0;
4387}

4389void EnumDecl::anchor() {}

4391EnumDecl *EnumDecl::Create(ASTContext &C, DeclContext *DC,
                         SourceLocation StartLoc, SourceLocation IdLoc,
                         IdentifierInfo *Id,
                         EnumDecl *PrevDecl, bool IsScoped,
                         bool IsScopedUsingClassTag, bool IsFixed) {
auto *Enum = new (C, DC) EnumDecl(C, DC, StartLoc, IdLoc, Id, PrevDecl,
                                  IsScoped, IsScopedUsingClassTag, IsFixed);
Enum->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
C.getTypeDeclType(Enum, PrevDecl);
return Enum;
4401}

4403EnumDecl *EnumDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
EnumDecl *Enum =
    new (C, ID) EnumDecl(C, nullptr, SourceLocation(), SourceLocation(),
                         nullptr, nullptr, false, false, false);
Enum->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
return Enum;
4409}

4411SourceRange EnumDecl::getIntegerTypeRange() const {
if (const TypeSourceInfo *TI = getIntegerTypeSourceInfo())
  return TI->getTypeLoc().getSourceRange();
return SourceRange();
4415}

4417void EnumDecl::completeDefinition(QualType NewType,
                                QualType NewPromotionType,
                                unsigned NumPositiveBits,
                                unsigned NumNegativeBits) {
assert(!isCompleteDefinition() && "Cannot redefine enums!")((void)0);
if (!IntegerType)
  IntegerType = NewType.getTypePtr();
PromotionType = NewPromotionType;
setNumPositiveBits(NumPositiveBits);
setNumNegativeBits(NumNegativeBits);
TagDecl::completeDefinition();
4428}

4430bool EnumDecl::isClosed() const {
if (const auto *A = getAttr<EnumExtensibilityAttr>())
  return A->getExtensibility() == EnumExtensibilityAttr::Closed;
return true;
4434}

4436bool EnumDecl::isClosedFlag() const {
return isClosed() && hasAttr<FlagEnumAttr>();
4438}

4440bool EnumDecl::isClosedNonFlag() const {
return isClosed() && !hasAttr<FlagEnumAttr>();
4442}

4444TemplateSpecializationKind EnumDecl::getTemplateSpecializationKind() const {
if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
  return MSI->getTemplateSpecializationKind();

return TSK_Undeclared;
4449}

4451void EnumDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
                                       SourceLocation PointOfInstantiation) {
MemberSpecializationInfo *MSI = getMemberSpecializationInfo();
assert(MSI && "Not an instantiated member enumeration?")((void)0);
MSI->setTemplateSpecializationKind(TSK);
if (TSK != TSK_ExplicitSpecialization &&
    PointOfInstantiation.isValid() &&
    MSI->getPointOfInstantiation().isInvalid())
  MSI->setPointOfInstantiation(PointOfInstantiation);
4460}

4462EnumDecl *EnumDecl::getTemplateInstantiationPattern() const {
if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo()) {
  if (isTemplateInstantiation(MSInfo->getTemplateSpecializationKind())) {
    EnumDecl *ED = getInstantiatedFromMemberEnum();
    while (auto *NewED = ED->getInstantiatedFromMemberEnum())
      ED = NewED;
    return getDefinitionOrSelf(ED);
  }
}

assert(!isTemplateInstantiation(getTemplateSpecializationKind()) &&((void)0)
       "couldn't find pattern for enum instantiation")((void)0);
return nullptr;
4475}

4477EnumDecl *EnumDecl::getInstantiatedFromMemberEnum() const {
if (SpecializationInfo)
  return cast<EnumDecl>(SpecializationInfo->getInstantiatedFrom());

return nullptr;
4482}

4484void EnumDecl::setInstantiationOfMemberEnum(ASTContext &C, EnumDecl *ED,
                                          TemplateSpecializationKind TSK) {
assert(!SpecializationInfo && "Member enum is already a specialization")((void)0);
SpecializationInfo = new (C) MemberSpecializationInfo(ED, TSK);
4488}

4490unsigned EnumDecl::getODRHash() {
if (hasODRHash())
  return ODRHash;

class ODRHash Hash;
Hash.AddEnumDecl(this);
setHasODRHash(true);
ODRHash = Hash.CalculateHash();
return ODRHash;
4499}

4501//===----------------------------------------------------------------------===//
4502// RecordDecl Implementation
4503//===----------------------------------------------------------------------===//

4505RecordDecl::RecordDecl(Kind DK, TagKind TK, const ASTContext &C,
                     DeclContext *DC, SourceLocation StartLoc,
                     SourceLocation IdLoc, IdentifierInfo *Id,
                     RecordDecl *PrevDecl)
  : TagDecl(DK, TK, C, DC, IdLoc, Id, PrevDecl, StartLoc) {
assert(classof(static_cast<Decl *>(this)) && "Invalid Kind!")((void)0);
setHasFlexibleArrayMember(false);
setAnonymousStructOrUnion(false);
setHasObjectMember(false);
setHasVolatileMember(false);
setHasLoadedFieldsFromExternalStorage(false);
setNonTrivialToPrimitiveDefaultInitialize(false);
setNonTrivialToPrimitiveCopy(false);
setNonTrivialToPrimitiveDestroy(false);
setHasNonTrivialToPrimitiveDefaultInitializeCUnion(false);
setHasNonTrivialToPrimitiveDestructCUnion(false);
setHasNonTrivialToPrimitiveCopyCUnion(false);
setParamDestroyedInCallee(false);
setArgPassingRestrictions(APK_CanPassInRegs);
4524}

4526RecordDecl *RecordDecl::Create(const ASTContext &C, TagKind TK, DeclContext *DC,
                             SourceLocation StartLoc, SourceLocation IdLoc,
                             IdentifierInfo *Id, RecordDecl* PrevDecl) {
RecordDecl *R = new (C, DC) RecordDecl(Record, TK, C, DC,
                                       StartLoc, IdLoc, Id, PrevDecl);
R->setMayHaveOutOfDateDef(C.getLangOpts().Modules);

C.getTypeDeclType(R, PrevDecl);
return R;
4535}

4537RecordDecl *RecordDecl::CreateDeserialized(const ASTContext &C, unsigned ID) {
RecordDecl *R =
    new (C, ID) RecordDecl(Record, TTK_Struct, C, nullptr, SourceLocation(),
                           SourceLocation(), nullptr, nullptr);
R->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
return R;
4543}

4545bool RecordDecl::isInjectedClassName() const {
return isImplicit() && getDeclName() && getDeclContext()->isRecord() &&
  cast<RecordDecl>(getDeclContext())->getDeclName() == getDeclName();
4548}

4550bool RecordDecl::isLambda() const {
if (auto RD = dyn_cast<CXXRecordDecl>(this))
  return RD->isLambda();
return false;
4554}

4556bool RecordDecl::isCapturedRecord() const {
return hasAttr<CapturedRecordAttr>();
4558}

4560void RecordDecl::setCapturedRecord() {
addAttr(CapturedRecordAttr::CreateImplicit(getASTContext()));
4562}

4564bool RecordDecl::isOrContainsUnion() const {
if (isUnion())
  return true;

if (const RecordDecl *Def = getDefinition()) {
  for (const FieldDecl *FD : Def->fields()) {
    const RecordType *RT = FD->getType()->getAs<RecordType>();
    if (RT && RT->getDecl()->isOrContainsUnion())
      return true;
  }
}

return false;
4577}

4579RecordDecl::field_iterator RecordDecl::field_begin() const {
if (hasExternalLexicalStorage() && !hasLoadedFieldsFromExternalStorage())
  LoadFieldsFromExternalStorage();

return field_iterator(decl_iterator(FirstDecl));
4584}

4586/// completeDefinition - Notes that the definition of this type is now
4587/// complete.
4588void RecordDecl::completeDefinition() {
assert(!isCompleteDefinition() && "Cannot redefine record!")((void)0);
TagDecl::completeDefinition();

ASTContext &Ctx = getASTContext();

// Layouts are dumped when computed, so if we are dumping for all complete
// types, we need to force usage to get types that wouldn't be used elsewhere.
if (Ctx.getLangOpts().DumpRecordLayoutsComplete)
  (void)Ctx.getASTRecordLayout(this);
4598}

4600/// isMsStruct - Get whether or not this record uses ms_struct layout.
4601/// This which can be turned on with an attribute, pragma, or the
4602/// -mms-bitfields command-line option.
4603bool RecordDecl::isMsStruct(const ASTContext &C) const {
return hasAttr<MSStructAttr>() || C.getLangOpts().MSBitfields == 1;
4605}

4607void RecordDecl::LoadFieldsFromExternalStorage() const {
ExternalASTSource *Source = getASTContext().getExternalSource();
assert(hasExternalLexicalStorage() && Source && "No external storage?")((void)0);

// Notify that we have a RecordDecl doing some initialization.
ExternalASTSource::Deserializing TheFields(Source);

SmallVector<Decl*, 64> Decls;
setHasLoadedFieldsFromExternalStorage(true);
Source->FindExternalLexicalDecls(this, [](Decl::Kind K) {
  return FieldDecl::classofKind(K) || IndirectFieldDecl::classofKind(K);
}, Decls);

4620#ifndef NDEBUG1
// Check that all decls we got were FieldDecls.
for (unsigned i=0, e=Decls.size(); i != e; ++i)
  assert(isa<FieldDecl>(Decls[i]) || isa<IndirectFieldDecl>(Decls[i]))((void)0);
4624#endif

if (Decls.empty())
  return;

std::tie(FirstDecl, LastDecl) = BuildDeclChain(Decls,
                                               /*FieldsAlreadyLoaded=*/false);
4631}

4633bool RecordDecl::mayInsertExtraPadding(bool EmitRemark) const {
ASTContext &Context = getASTContext();
const SanitizerMask EnabledAsanMask = Context.getLangOpts().Sanitize.Mask &
    (SanitizerKind::Address | SanitizerKind::KernelAddress);
if (!EnabledAsanMask || !Context.getLangOpts().SanitizeAddressFieldPadding)
  return false;
const auto &NoSanitizeList = Context.getNoSanitizeList();
const auto *CXXRD = dyn_cast<CXXRecordDecl>(this);
// We may be able to relax some of these requirements.
int ReasonToReject = -1;
if (!CXXRD || CXXRD->isExternCContext())
  ReasonToReject = 0;  // is not C++.
else if (CXXRD->hasAttr<PackedAttr>())
  ReasonToReject = 1;  // is packed.
else if (CXXRD->isUnion())
  ReasonToReject = 2;  // is a union.
else if (CXXRD->isTriviallyCopyable())
  ReasonToReject = 3;  // is trivially copyable.
else if (CXXRD->hasTrivialDestructor())
  ReasonToReject = 4;  // has trivial destructor.
else if (CXXRD->isStandardLayout())
  ReasonToReject = 5;  // is standard layout.
else if (NoSanitizeList.containsLocation(EnabledAsanMask, getLocation(),
                                         "field-padding"))
  ReasonToReject = 6;  // is in an excluded file.
else if (NoSanitizeList.containsType(
             EnabledAsanMask, getQualifiedNameAsString(), "field-padding"))
  ReasonToReject = 7;  // The type is excluded.

if (EmitRemark) {
  if (ReasonToReject >= 0)
    Context.getDiagnostics().Report(
        getLocation(),
        diag::remark_sanitize_address_insert_extra_padding_rejected)
        << getQualifiedNameAsString() << ReasonToReject;
  else
    Context.getDiagnostics().Report(
        getLocation(),
        diag::remark_sanitize_address_insert_extra_padding_accepted)
        << getQualifiedNameAsString();
}
return ReasonToReject < 0;
4675}

4677const FieldDecl *RecordDecl::findFirstNamedDataMember() const {
for (const auto *I : fields()) {
  if (I->getIdentifier())
    return I;

  if (const auto *RT = I->getType()->getAs<RecordType>())
    if (const FieldDecl *NamedDataMember =
            RT->getDecl()->findFirstNamedDataMember())
      return NamedDataMember;
}

// We didn't find a named data member.
return nullptr;
4690}

4692//===----------------------------------------------------------------------===//
4693// BlockDecl Implementation
4694//===----------------------------------------------------------------------===//

4696BlockDecl::BlockDecl(DeclContext *DC, SourceLocation CaretLoc)
  : Decl(Block, DC, CaretLoc), DeclContext(Block) {
setIsVariadic(false);
setCapturesCXXThis(false);
setBlockMissingReturnType(true);
setIsConversionFromLambda(false);
setDoesNotEscape(false);
setCanAvoidCopyToHeap(false);
4704}

4706void BlockDecl::setParams(ArrayRef<ParmVarDecl *> NewParamInfo) {
assert(!ParamInfo && "Already has param info!")((void)0);

// Zero params -> null pointer.
if (!NewParamInfo.empty()) {
  NumParams = NewParamInfo.size();
  ParamInfo = new (getASTContext()) ParmVarDecl*[NewParamInfo.size()];
  std::copy(NewParamInfo.begin(), NewParamInfo.end(), ParamInfo);
}
4715}

4717void BlockDecl::setCaptures(ASTContext &Context, ArrayRef<Capture> Captures,
                          bool CapturesCXXThis) {
this->setCapturesCXXThis(CapturesCXXThis);
this->NumCaptures = Captures.size();

if (Captures.empty()) {
  this->Captures = nullptr;
  return;
}

this->Captures = Captures.copy(Context).data();
4728}

4730bool BlockDecl::capturesVariable(const VarDecl *variable) const {
for (const auto &I : captures())
  // Only auto vars can be captured, so no redeclaration worries.
  if (I.getVariable() == variable)
    return true;

return false;
4737}

4739SourceRange BlockDecl::getSourceRange() const {
return SourceRange(getLocation(), Body ? Body->getEndLoc() : getLocation());
4741}

4743//===----------------------------------------------------------------------===//
4744// Other Decl Allocation/Deallocation Method Implementations
4745//===----------------------------------------------------------------------===//

4747void TranslationUnitDecl::anchor() {}

4749TranslationUnitDecl *TranslationUnitDecl::Create(ASTContext &C) {
return new (C, (DeclContext *)nullptr) TranslationUnitDecl(C);
4751}

4753void PragmaCommentDecl::anchor() {}

4755PragmaCommentDecl *PragmaCommentDecl::Create(const ASTContext &C,
                                           TranslationUnitDecl *DC,
                                           SourceLocation CommentLoc,
                                           PragmaMSCommentKind CommentKind,
                                           StringRef Arg) {
PragmaCommentDecl *PCD =
    new (C, DC, additionalSizeToAlloc<char>(Arg.size() + 1))
        PragmaCommentDecl(DC, CommentLoc, CommentKind);
memcpy(PCD->getTrailingObjects<char>(), Arg.data(), Arg.size());
PCD->getTrailingObjects<char>()[Arg.size()] = '\0';
return PCD;
4766}

4768PragmaCommentDecl *PragmaCommentDecl::CreateDeserialized(ASTContext &C,
                                                       unsigned ID,
                                                       unsigned ArgSize) {
return new (C, ID, additionalSizeToAlloc<char>(ArgSize + 1))
    PragmaCommentDecl(nullptr, SourceLocation(), PCK_Unknown);
4773}

4775void PragmaDetectMismatchDecl::anchor() {}

4777PragmaDetectMismatchDecl *
4778PragmaDetectMismatchDecl::Create(const ASTContext &C, TranslationUnitDecl *DC,
                               SourceLocation Loc, StringRef Name,
                               StringRef Value) {
size_t ValueStart = Name.size() + 1;
PragmaDetectMismatchDecl *PDMD =
    new (C, DC, additionalSizeToAlloc<char>(ValueStart + Value.size() + 1))
        PragmaDetectMismatchDecl(DC, Loc, ValueStart);
memcpy(PDMD->getTrailingObjects<char>(), Name.data(), Name.size());
PDMD->getTrailingObjects<char>()[Name.size()] = '\0';
memcpy(PDMD->getTrailingObjects<char>() + ValueStart, Value.data(),
       Value.size());
PDMD->getTrailingObjects<char>()[ValueStart + Value.size()] = '\0';
return PDMD;
4791}

4793PragmaDetectMismatchDecl *
4794PragmaDetectMismatchDecl::CreateDeserialized(ASTContext &C, unsigned ID,
                                           unsigned NameValueSize) {
return new (C, ID, additionalSizeToAlloc<char>(NameValueSize + 1))
    PragmaDetectMismatchDecl(nullptr, SourceLocation(), 0);
4798}

4800void ExternCContextDecl::anchor() {}

4802ExternCContextDecl *ExternCContextDecl::Create(const ASTContext &C,
                                             TranslationUnitDecl *DC) {
return new (C, DC) ExternCContextDecl(DC);
4805}

4807void LabelDecl::anchor() {}

4809LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC,
                           SourceLocation IdentL, IdentifierInfo *II) {
return new (C, DC) LabelDecl(DC, IdentL, II, nullptr, IdentL);
4812}

4814LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC,
                           SourceLocation IdentL, IdentifierInfo *II,
                           SourceLocation GnuLabelL) {
assert(GnuLabelL != IdentL && "Use this only for GNU local labels")((void)0);
return new (C, DC) LabelDecl(DC, IdentL, II, nullptr, GnuLabelL);
4819}

4821LabelDecl *LabelDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
return new (C, ID) LabelDecl(nullptr, SourceLocation(), nullptr, nullptr,
                             SourceLocation());
4824}

4826void LabelDecl::setMSAsmLabel(StringRef Name) {
4827char *Buffer = new (getASTContext(), 1) char[Name.size() + 1];
memcpy(Buffer, Name.data(), Name.size());
Buffer[Name.size()] = '\0';
MSAsmName = Buffer;
4831}

4833void ValueDecl::anchor() {}

4835bool ValueDecl::isWeak() const {
auto *MostRecent = getMostRecentDecl();
return MostRecent->hasAttr<WeakAttr>() ||
       MostRecent->hasAttr<WeakRefAttr>() || isWeakImported();
4839}

4841void ImplicitParamDecl::anchor() {}

4843ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, DeclContext *DC,
                                           SourceLocation IdLoc,
                                           IdentifierInfo *Id, QualType Type,
                                           ImplicitParamKind ParamKind) {
return new (C, DC) ImplicitParamDecl(C, DC, IdLoc, Id, Type, ParamKind);
4848}

4850ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, QualType Type,
                                           ImplicitParamKind ParamKind) {
return new (C, nullptr) ImplicitParamDecl(C, Type, ParamKind);
4853}

4855ImplicitParamDecl *ImplicitParamDecl::CreateDeserialized(ASTContext &C,
                                                       unsigned ID) {
return new (C, ID) ImplicitParamDecl(C, QualType(), ImplicitParamKind::Other);
4858}

4860FunctionDecl *FunctionDecl::Create(ASTContext &C, DeclContext *DC,
                                 SourceLocation StartLoc,
                                 const DeclarationNameInfo &NameInfo,
                                 QualType T, TypeSourceInfo *TInfo,
                                 StorageClass SC, bool isInlineSpecified,
                                 bool hasWrittenPrototype,
                                 ConstexprSpecKind ConstexprKind,
                                 Expr *TrailingRequiresClause) {
FunctionDecl *New =
    new (C, DC) FunctionDecl(Function, C, DC, StartLoc, NameInfo, T, TInfo,
                             SC, isInlineSpecified, ConstexprKind,
                             TrailingRequiresClause);
New->setHasWrittenPrototype(hasWrittenPrototype);
return New;
4874}

4876FunctionDecl *FunctionDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
return new (C, ID) FunctionDecl(
    Function, C, nullptr, SourceLocation(), DeclarationNameInfo(), QualType(),
    nullptr, SC_None, false, ConstexprSpecKind::Unspecified, nullptr);
4880}

4882BlockDecl *BlockDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) {
return new (C, DC) BlockDecl(DC, L);
4884}

4886BlockDecl *BlockDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
return new (C, ID) BlockDecl(nullptr, SourceLocation());
4888}

4890CapturedDecl::CapturedDecl(DeclContext *DC, unsigned NumParams)
  : Decl(Captured, DC, SourceLocation()), DeclContext(Captured),
    NumParams(NumParams), ContextParam(0), BodyAndNothrow(nullptr, false) {}

4894CapturedDecl *CapturedDecl::Create(ASTContext &C, DeclContext *DC,
                                 unsigned NumParams) {
return new (C, DC, additionalSizeToAlloc<ImplicitParamDecl *>(NumParams))
    CapturedDecl(DC, NumParams);
4898}

4900CapturedDecl *CapturedDecl::CreateDeserialized(ASTContext &C, unsigned ID,
                                             unsigned NumParams) {
return new (C, ID, additionalSizeToAlloc<ImplicitParamDecl *>(NumParams))
    CapturedDecl(nullptr, NumParams);
4904}

4906Stmt *CapturedDecl::getBody() const { return BodyAndNothrow.getPointer(); }
4907void CapturedDecl::setBody(Stmt *B) { BodyAndNothrow.setPointer(B); }

4909bool CapturedDecl::isNothrow() const { return BodyAndNothrow.getInt(); }
4910void CapturedDecl::setNothrow(bool Nothrow) { BodyAndNothrow.setInt(Nothrow); }

4912EnumConstantDecl *EnumConstantDecl::Create(ASTContext &C, EnumDecl *CD,
                                         SourceLocation L,
                                         IdentifierInfo *Id, QualType T,
                                         Expr *E, const llvm::APSInt &V) {
return new (C, CD) EnumConstantDecl(CD, L, Id, T, E, V);
4917}

4919EnumConstantDecl *
4920EnumConstantDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
return new (C, ID) EnumConstantDecl(nullptr, SourceLocation(), nullptr,
                                    QualType(), nullptr, llvm::APSInt());
4923}

4925void IndirectFieldDecl::anchor() {}

4927IndirectFieldDecl::IndirectFieldDecl(ASTContext &C, DeclContext *DC,
                                   SourceLocation L, DeclarationName N,
                                   QualType T,
                                   MutableArrayRef<NamedDecl *> CH)
  : ValueDecl(IndirectField, DC, L, N, T), Chaining(CH.data()),
    ChainingSize(CH.size()) {
// In C++, indirect field declarations conflict with tag declarations in the
// same scope, so add them to IDNS_Tag so that tag redeclaration finds them.
if (C.getLangOpts().CPlusPlus)
  IdentifierNamespace |= IDNS_Tag;
4937}

4939IndirectFieldDecl *
4940IndirectFieldDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L,
                        IdentifierInfo *Id, QualType T,
                        llvm::MutableArrayRef<NamedDecl *> CH) {
return new (C, DC) IndirectFieldDecl(C, DC, L, Id, T, CH);
4944}

4946IndirectFieldDecl *IndirectFieldDecl::CreateDeserialized(ASTContext &C,
                                                       unsigned ID) {
return new (C, ID) IndirectFieldDecl(C, nullptr, SourceLocation(),
                                     DeclarationName(), QualType(), None);
4950}

4952SourceRange EnumConstantDecl::getSourceRange() const {
SourceLocation End = getLocation();
if (Init)
  End = Init->getEndLoc();
return SourceRange(getLocation(), End);
4957}

4959void TypeDecl::anchor() {}

4961TypedefDecl *TypedefDecl::Create(ASTContext &C, DeclContext *DC,
                               SourceLocation StartLoc, SourceLocation IdLoc,
                               IdentifierInfo *Id, TypeSourceInfo *TInfo) {
return new (C, DC) TypedefDecl(C, DC, StartLoc, IdLoc, Id, TInfo);
4965}

4967void TypedefNameDecl::anchor() {}

4969TagDecl *TypedefNameDecl::getAnonDeclWithTypedefName(bool AnyRedecl) const {
if (auto *TT = getTypeSourceInfo()->getType()->getAs<TagType>()) {
  auto *OwningTypedef = TT->getDecl()->getTypedefNameForAnonDecl();
  auto *ThisTypedef = this;
  if (AnyRedecl && OwningTypedef) {
    OwningTypedef = OwningTypedef->getCanonicalDecl();
    ThisTypedef = ThisTypedef->getCanonicalDecl();
  }
  if (OwningTypedef == ThisTypedef)
    return TT->getDecl();
}

return nullptr;
4982}

4984bool TypedefNameDecl::isTransparentTagSlow() const {
auto determineIsTransparent = [&]() {
  if (auto *TT = getUnderlyingType()->getAs<TagType>()) {
    if (auto *TD = TT->getDecl()) {
      if (TD->getName() != getName())
        return false;
      SourceLocation TTLoc = getLocation();
      SourceLocation TDLoc = TD->getLocation();
      if (!TTLoc.isMacroID() || !TDLoc.isMacroID())
        return false;
      SourceManager &SM = getASTContext().getSourceManager();
      return SM.getSpellingLoc(TTLoc) == SM.getSpellingLoc(TDLoc);
    }
  }
  return false;
};

bool isTransparent = determineIsTransparent();
MaybeModedTInfo.setInt((isTransparent << 1) | 1);
return isTransparent;
5004}

5006TypedefDecl *TypedefDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
return new (C, ID) TypedefDecl(C, nullptr, SourceLocation(), SourceLocation(),
                               nullptr, nullptr);
5009}

5011TypeAliasDecl *TypeAliasDecl::Create(ASTContext &C, DeclContext *DC,
                                   SourceLocation StartLoc,
                                   SourceLocation IdLoc, IdentifierInfo *Id,
                                   TypeSourceInfo *TInfo) {
return new (C, DC) TypeAliasDecl(C, DC, StartLoc, IdLoc, Id, TInfo);
5016}

5018TypeAliasDecl *TypeAliasDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
return new (C, ID) TypeAliasDecl(C, nullptr, SourceLocation(),
                                 SourceLocation(), nullptr, nullptr);
5021}

5023SourceRange TypedefDecl::getSourceRange() const {
SourceLocation RangeEnd = getLocation();
if (TypeSourceInfo *TInfo = getTypeSourceInfo()) {
  if (typeIsPostfix(TInfo->getType()))
    RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
}
return SourceRange(getBeginLoc(), RangeEnd);
5030}

5032SourceRange TypeAliasDecl::getSourceRange() const {
SourceLocation RangeEnd = getBeginLoc();
if (TypeSourceInfo *TInfo = getTypeSourceInfo())
  RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
return SourceRange(getBeginLoc(), RangeEnd);
5037}

5039void FileScopeAsmDecl::anchor() {}

5041FileScopeAsmDecl *FileScopeAsmDecl::Create(ASTContext &C, DeclContext *DC,
                                         StringLiteral *Str,
                                         SourceLocation AsmLoc,
                                         SourceLocation RParenLoc) {
return new (C, DC) FileScopeAsmDecl(DC, Str, AsmLoc, RParenLoc);
5046}

5048FileScopeAsmDecl *FileScopeAsmDecl::CreateDeserialized(ASTContext &C,
                                                     unsigned ID) {
return new (C, ID) FileScopeAsmDecl(nullptr, nullptr, SourceLocation(),
                                    SourceLocation());
5052}

5054void EmptyDecl::anchor() {}

5056EmptyDecl *EmptyDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) {
return new (C, DC) EmptyDecl(DC, L);
5058}

5060EmptyDecl *EmptyDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
return new (C, ID) EmptyDecl(nullptr, SourceLocation());
5062}

5064//===----------------------------------------------------------------------===//
5065// ImportDecl Implementation
5066//===----------------------------------------------------------------------===//

5068/// Retrieve the number of module identifiers needed to name the given
5069/// module.
5070static unsigned getNumModuleIdentifiers(Module *Mod) {
unsigned Result = 1;
while (Mod->Parent) {
  Mod = Mod->Parent;
  ++Result;
}
return Result;
5077}

5079ImportDecl::ImportDecl(DeclContext *DC, SourceLocation StartLoc,
                     Module *Imported,
                     ArrayRef<SourceLocation> IdentifierLocs)
  : Decl(Import, DC, StartLoc), ImportedModule(Imported),
    NextLocalImportAndComplete(nullptr, true) {
assert(getNumModuleIdentifiers(Imported) == IdentifierLocs.size())((void)0);
auto *StoredLocs = getTrailingObjects<SourceLocation>();
std::uninitialized_copy(IdentifierLocs.begin(), IdentifierLocs.end(),
                        StoredLocs);
5088}

5090ImportDecl::ImportDecl(DeclContext *DC, SourceLocation StartLoc,
                     Module *Imported, SourceLocation EndLoc)
  : Decl(Import, DC, StartLoc), ImportedModule(Imported),
    NextLocalImportAndComplete(nullptr, false) {
*getTrailingObjects<SourceLocation>() = EndLoc;
5095}

5097ImportDecl *ImportDecl::Create(ASTContext &C, DeclContext *DC,
                             SourceLocation StartLoc, Module *Imported,
                             ArrayRef<SourceLocation> IdentifierLocs) {
return new (C, DC,
            additionalSizeToAlloc<SourceLocation>(IdentifierLocs.size()))
    ImportDecl(DC, StartLoc, Imported, IdentifierLocs);
5103}

5105ImportDecl *ImportDecl::CreateImplicit(ASTContext &C, DeclContext *DC,
                                     SourceLocation StartLoc,
                                     Module *Imported,
                                     SourceLocation EndLoc) {
ImportDecl *Import = new (C, DC, additionalSizeToAlloc<SourceLocation>(1))
    ImportDecl(DC, StartLoc, Imported, EndLoc);
Import->setImplicit();
return Import;
5113}

5115ImportDecl *ImportDecl::CreateDeserialized(ASTContext &C, unsigned ID,
                                         unsigned NumLocations) {
return new (C, ID, additionalSizeToAlloc<SourceLocation>(NumLocations))
    ImportDecl(EmptyShell());
5119}

5121ArrayRef<SourceLocation> ImportDecl::getIdentifierLocs() const {
if (!isImportComplete())
  return None;

const auto *StoredLocs = getTrailingObjects<SourceLocation>();
return llvm::makeArrayRef(StoredLocs,
                          getNumModuleIdentifiers(getImportedModule()));
5128}

5130SourceRange ImportDecl::getSourceRange() const {
if (!isImportComplete())
  return SourceRange(getLocation(), *getTrailingObjects<SourceLocation>());

return SourceRange(getLocation(), getIdentifierLocs().back());
5135}

5137//===----------------------------------------------------------------------===//
5138// ExportDecl Implementation
5139//===----------------------------------------------------------------------===//

5141void ExportDecl::anchor() {}

5143ExportDecl *ExportDecl::Create(ASTContext &C, DeclContext *DC,
                             SourceLocation ExportLoc) {
return new (C, DC) ExportDecl(DC, ExportLoc);
5146}

5148ExportDecl *ExportDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
return new (C, ID) ExportDecl(nullptr, SourceLocation());
5150}

←

/usr/src/gnu/usr.bin/clang/libclangAST/../../../llvm/llvm/include/llvm/Support/TrailingObjects.h

1//===--- TrailingObjects.h - Variable-length classes ------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8///
9/// \file
10/// This header defines support for implementing classes that have
11/// some trailing object (or arrays of objects) appended to them. The
12/// main purpose is to make it obvious where this idiom is being used,
13/// and to make the usage more idiomatic and more difficult to get
14/// wrong.
15///
16/// The TrailingObject template abstracts away the reinterpret_cast,
17/// pointer arithmetic, and size calculations used for the allocation
18/// and access of appended arrays of objects, and takes care that they
19/// are all allocated at their required alignment. Additionally, it
20/// ensures that the base type is final -- deriving from a class that
21/// expects data appended immediately after it is typically not safe.
22///
23/// Users are expected to derive from this template, and provide
24/// numTrailingObjects implementations for each trailing type except
25/// the last, e.g. like this sample:
26///
27/// \code
28/// class VarLengthObj : private TrailingObjects<VarLengthObj, int, double> {
29///   friend TrailingObjects;
30///
31///   unsigned NumInts, NumDoubles;
32///   size_t numTrailingObjects(OverloadToken<int>) const { return NumInts; }
33///  };
34/// \endcode
35///
36/// You can access the appended arrays via 'getTrailingObjects', and
37/// determine the size needed for allocation via
38/// 'additionalSizeToAlloc' and 'totalSizeToAlloc'.
39///
40/// All the methods implemented by this class are are intended for use
41/// by the implementation of the class, not as part of its interface
42/// (thus, private inheritance is suggested).
43///
44//===----------------------------------------------------------------------===//
45 
46#ifndef LLVM_SUPPORT_TRAILINGOBJECTS_H
47#define LLVM_SUPPORT_TRAILINGOBJECTS_H
48 
49#include "llvm/Support/AlignOf.h"
50#include "llvm/Support/Alignment.h"
51#include "llvm/Support/Compiler.h"
52#include "llvm/Support/MathExtras.h"
53#include "llvm/Support/type_traits.h"
54#include <new>
55#include <type_traits>
56 
57namespace llvm {
58 
59namespace trailing_objects_internal {
60/// Helper template to calculate the max alignment requirement for a set of
61/// objects.
62template <typename First, typename... Rest> class AlignmentCalcHelper {
63private:
64  enum {
65    FirstAlignment = alignof(First),
66    RestAlignment = AlignmentCalcHelper<Rest...>::Alignment,
67  };
68 
69public:
70  enum {
71    Alignment = FirstAlignment > RestAlignment ? FirstAlignment : RestAlignment
72  };
73};
74 
75template <typename First> class AlignmentCalcHelper<First> {
76public:
77  enum { Alignment = alignof(First) };
78};
79 
80/// The base class for TrailingObjects* classes.
81class TrailingObjectsBase {
82protected:
83  /// OverloadToken's purpose is to allow specifying function overloads
84  /// for different types, without actually taking the types as
85  /// parameters. (Necessary because member function templates cannot
86  /// be specialized, so overloads must be used instead of
87  /// specialization.)
88  template <typename T> struct OverloadToken {};
89};
90 
91// Just a little helper for transforming a type pack into the same
92// number of a different type. e.g.:
93//   ExtractSecondType<Foo..., int>::type
94template <typename Ty1, typename Ty2> struct ExtractSecondType {
95  typedef Ty2 type;
96};
97 
98// TrailingObjectsImpl is somewhat complicated, because it is a
99// recursively inheriting template, in order to handle the template
100// varargs. Each level of inheritance picks off a single trailing type
101// then recurses on the rest. The "Align", "BaseTy", and
102// "TopTrailingObj" arguments are passed through unchanged through the
103// recursion. "PrevTy" is, at each level, the type handled by the
104// level right above it.
105 
106template <int Align, typename BaseTy, typename TopTrailingObj, typename PrevTy,
107          typename... MoreTys>
108class TrailingObjectsImpl {
109  // The main template definition is never used -- the two
110  // specializations cover all possibilities.
111};
112 
113template <int Align, typename BaseTy, typename TopTrailingObj, typename PrevTy,
114          typename NextTy, typename... MoreTys>
115class TrailingObjectsImpl<Align, BaseTy, TopTrailingObj, PrevTy, NextTy,
116                          MoreTys...>
117    : public TrailingObjectsImpl<Align, BaseTy, TopTrailingObj, NextTy,
118                                 MoreTys...> {
119 
120  typedef TrailingObjectsImpl<Align, BaseTy, TopTrailingObj, NextTy, MoreTys...>
121      ParentType;
122 
123  struct RequiresRealignment {
124    static const bool value = alignof(PrevTy) < alignof(NextTy);
125  };
126 
127  static constexpr bool requiresRealignment() {
128    return RequiresRealignment::value;
129  }
130 
131protected:
132  // Ensure the inherited getTrailingObjectsImpl is not hidden.
133  using ParentType::getTrailingObjectsImpl;
134 
135  // These two functions are helper functions for
136  // TrailingObjects::getTrailingObjects. They recurse to the left --
137  // the result for each type in the list of trailing types depends on
138  // the result of calling the function on the type to the
139  // left. However, the function for the type to the left is
140  // implemented by a *subclass* of this class, so we invoke it via
141  // the TopTrailingObj, which is, via the
142  // curiously-recurring-template-pattern, the most-derived type in
143  // this recursion, and thus, contains all the overloads.
144  static const NextTy *
145  getTrailingObjectsImpl(const BaseTy *Obj,
146                         TrailingObjectsBase::OverloadToken<NextTy>) {
147    auto *Ptr = TopTrailingObj::getTrailingObjectsImpl(
148                    Obj, TrailingObjectsBase::OverloadToken<PrevTy>()) +
149                TopTrailingObj::callNumTrailingObjects(
150                    Obj, TrailingObjectsBase::OverloadToken<PrevTy>());
151 
152    if (requiresRealignment())
153      return reinterpret_cast<const NextTy *>(
154          alignAddr(Ptr, Align::Of<NextTy>()));
155    else
156      return reinterpret_cast<const NextTy *>(Ptr);
157  }
158 
159  static NextTy *
160  getTrailingObjectsImpl(BaseTy *Obj,
161                         TrailingObjectsBase::OverloadToken<NextTy>) {
162    auto *Ptr = TopTrailingObj::getTrailingObjectsImpl(
9
←
'Ptr' initialized here→
163                    Obj, TrailingObjectsBase::OverloadToken<PrevTy>()) +
8
←
Passing value via 1st parameter 'Obj'→
164                TopTrailingObj::callNumTrailingObjects(
165                    Obj, TrailingObjectsBase::OverloadToken<PrevTy>());
166 
167    if (requiresRealignment())
10
←
Taking false branch→
168      return reinterpret_cast<NextTy *>(alignAddr(Ptr, Align::Of<NextTy>()));
169    else
170      return reinterpret_cast<NextTy *>(Ptr);
11
←
Returning pointer (loaded from 'Ptr')→
171  }
172 
173  // Helper function for TrailingObjects::additionalSizeToAlloc: this
174  // function recurses to superclasses, each of which requires one
175  // fewer size_t argument, and adds its own size.
176  static constexpr size_t additionalSizeToAllocImpl(
177      size_t SizeSoFar, size_t Count1,
178      typename ExtractSecondType<MoreTys, size_t>::type... MoreCounts) {
179    return ParentType::additionalSizeToAllocImpl(
180        (requiresRealignment() ? llvm::alignTo<alignof(NextTy)>(SizeSoFar)
181                               : SizeSoFar) +
182            sizeof(NextTy) * Count1,
183        MoreCounts...);
184  }
185};
186 
187// The base case of the TrailingObjectsImpl inheritance recursion,
188// when there's no more trailing types.
189template <int Align, typename BaseTy, typename TopTrailingObj, typename PrevTy>
190class alignas(Align) TrailingObjectsImpl<Align, BaseTy, TopTrailingObj, PrevTy>
191    : public TrailingObjectsBase {
192protected:
193  // This is a dummy method, only here so the "using" doesn't fail --
194  // it will never be called, because this function recurses backwards
195  // up the inheritance chain to subclasses.
196  static void getTrailingObjectsImpl();
197 
198  static constexpr size_t additionalSizeToAllocImpl(size_t SizeSoFar) {
199    return SizeSoFar;
200  }
201 
202  template <bool CheckAlignment> static void verifyTrailingObjectsAlignment() {}
203};
204 
205} // end namespace trailing_objects_internal
206 
207// Finally, the main type defined in this file, the one intended for users...
208 
209/// See the file comment for details on the usage of the
210/// TrailingObjects type.
211template <typename BaseTy, typename... TrailingTys>
212class TrailingObjects : private trailing_objects_internal::TrailingObjectsImpl<
213                            trailing_objects_internal::AlignmentCalcHelper<
214                                TrailingTys...>::Alignment,
215                            BaseTy, TrailingObjects<BaseTy, TrailingTys...>,
216                            BaseTy, TrailingTys...> {
217 
218  template <int A, typename B, typename T, typename P, typename... M>
219  friend class trailing_objects_internal::TrailingObjectsImpl;
220 
221  template <typename... Tys> class Foo {};
222 
223  typedef trailing_objects_internal::TrailingObjectsImpl<
224      trailing_objects_internal::AlignmentCalcHelper<TrailingTys...>::Alignment,
225      BaseTy, TrailingObjects<BaseTy, TrailingTys...>, BaseTy, TrailingTys...>
226      ParentType;
227  using TrailingObjectsBase = trailing_objects_internal::TrailingObjectsBase;
228 
229  using ParentType::getTrailingObjectsImpl;
230 
231  // This function contains only a static_assert BaseTy is final. The
232  // static_assert must be in a function, and not at class-level
233  // because BaseTy isn't complete at class instantiation time, but
234  // will be by the time this function is instantiated.
235  static void verifyTrailingObjectsAssertions() {
236    static_assert(std::is_final<BaseTy>(), "BaseTy must be final.");
237  }
238 
239  // These two methods are the base of the recursion for this method.
240  static const BaseTy *
241  getTrailingObjectsImpl(const BaseTy *Obj,
242                         TrailingObjectsBase::OverloadToken<BaseTy>) {
243    return Obj;
244  }
245 
246  static BaseTy *
247  getTrailingObjectsImpl(BaseTy *Obj,
248                         TrailingObjectsBase::OverloadToken<BaseTy>) {
249    return Obj;
250  }
251 
252  // callNumTrailingObjects simply calls numTrailingObjects on the
253  // provided Obj -- except when the type being queried is BaseTy
254  // itself. There is always only one of the base object, so that case
255  // is handled here. (An additional benefit of indirecting through
256  // this function is that consumers only say "friend
257  // TrailingObjects", and thus, only this class itself can call the
258  // numTrailingObjects function.)
259  static size_t
260  callNumTrailingObjects(const BaseTy *Obj,
261                         TrailingObjectsBase::OverloadToken<BaseTy>) {
262    return 1;
263  }
264 
265  template <typename T>
266  static size_t callNumTrailingObjects(const BaseTy *Obj,
267                                       TrailingObjectsBase::OverloadToken<T>) {
268    return Obj->numTrailingObjects(TrailingObjectsBase::OverloadToken<T>());
269  }
270 
271public:
272  // Make this (privately inherited) member public.
273#ifndef _MSC_VER
274  using ParentType::OverloadToken;
275#else
276  // An MSVC bug prevents the above from working, (last tested at CL version
277  // 19.28). "Class5" in TrailingObjectsTest.cpp tests the problematic case.
278  template <typename T>
279  using OverloadToken = typename ParentType::template OverloadToken<T>;
280#endif
281 
282  /// Returns a pointer to the trailing object array of the given type
283  /// (which must be one of those specified in the class template). The
284  /// array may have zero or more elements in it.
285  template <typename T> const T *getTrailingObjects() const {
286    verifyTrailingObjectsAssertions();
287    // Forwards to an impl function with overloads, since member
288    // function templates can't be specialized.
289    return this->getTrailingObjectsImpl(
290        static_cast<const BaseTy *>(this),
291        TrailingObjectsBase::OverloadToken<T>());
292  }
293 
294  /// Returns a pointer to the trailing object array of the given type
295  /// (which must be one of those specified in the class template). The
296  /// array may have zero or more elements in it.
297  template <typename T> T *getTrailingObjects() {
298    verifyTrailingObjectsAssertions();
299    // Forwards to an impl function with overloads, since member
300    // function templates can't be specialized.
301    return this->getTrailingObjectsImpl(
7
←
Calling 'TrailingObjectsImpl::getTrailingObjectsImpl'→
12
←
Returning from 'TrailingObjectsImpl::getTrailingObjectsImpl'→
13
←
Returning pointer→
302        static_cast<BaseTy *>(this), TrailingObjectsBase::OverloadToken<T>());
6
←
Passing value via 1st parameter 'Obj'→
303  }
304 
305  /// Returns the size of the trailing data, if an object were
306  /// allocated with the given counts (The counts are in the same order
307  /// as the template arguments). This does not include the size of the
308  /// base object.  The template arguments must be the same as those
309  /// used in the class; they are supplied here redundantly only so
310  /// that it's clear what the counts are counting in callers.
311  template <typename... Tys>
312  static constexpr std::enable_if_t<
313      std::is_same<Foo<TrailingTys...>, Foo<Tys...>>::value, size_t>
314  additionalSizeToAlloc(typename trailing_objects_internal::ExtractSecondType<
315                        TrailingTys, size_t>::type... Counts) {
316    return ParentType::additionalSizeToAllocImpl(0, Counts...);
317  }
318 
319  /// Returns the total size of an object if it were allocated with the
320  /// given trailing object counts. This is the same as
321  /// additionalSizeToAlloc, except it *does* include the size of the base
322  /// object.
323  template <typename... Tys>
324  static constexpr std::enable_if_t<
325      std::is_same<Foo<TrailingTys...>, Foo<Tys...>>::value, size_t>
326  totalSizeToAlloc(typename trailing_objects_internal::ExtractSecondType<
327                   TrailingTys, size_t>::type... Counts) {
328    return sizeof(BaseTy) + ParentType::additionalSizeToAllocImpl(0, Counts...);
329  }
330 
331  TrailingObjects() = default;
332  TrailingObjects(const TrailingObjects &) = delete;
333  TrailingObjects(TrailingObjects &&) = delete;
334  TrailingObjects &operator=(const TrailingObjects &) = delete;
335  TrailingObjects &operator=(TrailingObjects &&) = delete;
336 
337  /// A type where its ::with_counts template member has a ::type member
338  /// suitable for use as uninitialized storage for an object with the given
339  /// trailing object counts. The template arguments are similar to those
340  /// of additionalSizeToAlloc.
341  ///
342  /// Use with FixedSizeStorageOwner, e.g.:
343  ///
344  /// \code{.cpp}
345  ///
346  /// MyObj::FixedSizeStorage<void *>::with_counts<1u>::type myStackObjStorage;
347  /// MyObj::FixedSizeStorageOwner
348  ///     myStackObjOwner(new ((void *)&myStackObjStorage) MyObj);
349  /// MyObj *const myStackObjPtr = myStackObjOwner.get();
350  ///
351  /// \endcode
352  template <typename... Tys> struct FixedSizeStorage {
353    template <size_t... Counts> struct with_counts {
354      enum { Size = totalSizeToAlloc<Tys...>(Counts...) };
355      struct type {
356        alignas(BaseTy) char buffer[Size];
357      };
358    };
359  };
360 
361  /// A type that acts as the owner for an object placed into fixed storage.
362  class FixedSizeStorageOwner {
363  public:
364    FixedSizeStorageOwner(BaseTy *p) : p(p) {}
365    ~FixedSizeStorageOwner() {
366      assert(p && "FixedSizeStorageOwner owns null?")((void)0);
367      p->~BaseTy();
368    }
369 
370    BaseTy *get() { return p; }
371    const BaseTy *get() const { return p; }
372 
373  private:
374    FixedSizeStorageOwner(const FixedSizeStorageOwner &) = delete;
375    FixedSizeStorageOwner(FixedSizeStorageOwner &&) = delete;
376    FixedSizeStorageOwner &operator=(const FixedSizeStorageOwner &) = delete;
377    FixedSizeStorageOwner &operator=(FixedSizeStorageOwner &&) = delete;
378 
379    BaseTy *const p;
380  };
381};
382 
383} // end namespace llvm
384 
385#endif