1 //===- Decl.cpp - Declaration AST Node Implementation ---------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Decl subclasses.
12 //===----------------------------------------------------------------------===//
14 #include "clang/AST/Decl.h"
16 #include "clang/AST/ASTContext.h"
17 #include "clang/AST/ASTLambda.h"
18 #include "clang/AST/ASTMutationListener.h"
19 #include "clang/AST/CanonicalType.h"
20 #include "clang/AST/DeclBase.h"
21 #include "clang/AST/DeclCXX.h"
22 #include "clang/AST/DeclObjC.h"
23 #include "clang/AST/DeclOpenMP.h"
24 #include "clang/AST/DeclTemplate.h"
25 #include "clang/AST/DeclarationName.h"
26 #include "clang/AST/Expr.h"
27 #include "clang/AST/ExprCXX.h"
28 #include "clang/AST/ExternalASTSource.h"
29 #include "clang/AST/ODRHash.h"
30 #include "clang/AST/PrettyDeclStackTrace.h"
31 #include "clang/AST/PrettyPrinter.h"
32 #include "clang/AST/Redeclarable.h"
33 #include "clang/AST/Stmt.h"
34 #include "clang/AST/TemplateBase.h"
35 #include "clang/AST/Type.h"
36 #include "clang/AST/TypeLoc.h"
37 #include "clang/Basic/Builtins.h"
38 #include "clang/Basic/IdentifierTable.h"
39 #include "clang/Basic/LLVM.h"
40 #include "clang/Basic/LangOptions.h"
41 #include "clang/Basic/Linkage.h"
42 #include "clang/Basic/Module.h"
43 #include "clang/Basic/PartialDiagnostic.h"
44 #include "clang/Basic/SanitizerBlacklist.h"
45 #include "clang/Basic/Sanitizers.h"
46 #include "clang/Basic/SourceLocation.h"
47 #include "clang/Basic/SourceManager.h"
48 #include "clang/Basic/Specifiers.h"
49 #include "clang/Basic/TargetCXXABI.h"
50 #include "clang/Basic/TargetInfo.h"
51 #include "clang/Basic/Visibility.h"
52 #include "clang/Frontend/FrontendDiagnostic.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/StringSwitch.h"
60 #include "llvm/ADT/StringRef.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"
72 #include <type_traits>
74 using namespace clang;
76 Decl *clang::getPrimaryMergedDecl(Decl *D) {
77 return D->getASTContext().getPrimaryMergedDecl(D);
80 void PrettyDeclStackTraceEntry::print(raw_ostream &OS) const {
81 SourceLocation Loc = this->Loc;
82 if (!Loc.isValid() && TheDecl) Loc = TheDecl->getLocation();
84 Loc.print(OS, Context.getSourceManager());
89 if (auto *ND = dyn_cast_or_null<NamedDecl>(TheDecl)) {
91 ND->getNameForDiagnostic(OS, Context.getPrintingPolicy(), true);
98 // Defined here so that it can be inlined into its direct callers.
99 bool Decl::isOutOfLine() const {
100 return !getLexicalDeclContext()->Equals(getDeclContext());
103 TranslationUnitDecl::TranslationUnitDecl(ASTContext &ctx)
104 : Decl(TranslationUnit, nullptr, SourceLocation()),
105 DeclContext(TranslationUnit), 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:
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.
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.
126 // 3. A variable that does not otherwise have explicit visibility can
127 // be restricted by the visibility of its type.
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.
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.
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.
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?
159 static bool hasExplicitVisibilityAlready(LVComputationKind computation) {
160 return computation.IgnoreExplicitVisibility;
163 /// Given an LVComputationKind, return one of the same type/value sort
164 /// that records that it already has explicit visibility.
165 static LVComputationKind
166 withExplicitVisibilityAlready(LVComputationKind Kind) {
167 Kind.IgnoreExplicitVisibility = true;
171 static Optional<Visibility> getExplicitVisibility(const NamedDecl *D,
172 LVComputationKind kind) {
173 assert(!kind.IgnoreExplicitVisibility &&
174 "asking for explicit visibility when we shouldn't be");
175 return D->getExplicitVisibility(kind.getExplicitVisibilityKind());
178 /// Is the given declaration a "type" or a "value" for the purposes of
179 /// visibility computation?
180 static bool usesTypeVisibility(const NamedDecl *D) {
181 return isa<TypeDecl>(D) ||
182 isa<ClassTemplateDecl>(D) ||
183 isa<ObjCInterfaceDecl>(D);
186 /// Does the given declaration have member specialization information,
187 /// and if so, is it an explicit specialization?
188 template <class T> static typename
189 std::enable_if<!std::is_base_of<RedeclarableTemplateDecl, T>::value, bool>::type
190 isExplicitMemberSpecialization(const T *D) {
191 if (const MemberSpecializationInfo *member =
192 D->getMemberSpecializationInfo()) {
193 return member->isExplicitSpecialization();
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.
201 static bool isExplicitMemberSpecialization(const RedeclarableTemplateDecl *D) {
202 return D->isMemberSpecialization();
205 /// Given a visibility attribute, return the explicit visibility
206 /// associated with it.
208 static Visibility getVisibilityFromAttr(const T *attr) {
209 switch (attr->getVisibility()) {
211 return DefaultVisibility;
213 return HiddenVisibility;
215 return ProtectedVisibility;
217 llvm_unreachable("bad visibility kind");
220 /// Return the explicit visibility of the given declaration.
221 static Optional<Visibility> getVisibilityOf(const NamedDecl *D,
222 NamedDecl::ExplicitVisibilityKind kind) {
223 // If we're ultimately computing the visibility of a type, look for
224 // a 'type_visibility' attribute before looking for 'visibility'.
225 if (kind == NamedDecl::VisibilityForType) {
226 if (const auto *A = D->getAttr<TypeVisibilityAttr>()) {
227 return getVisibilityFromAttr(A);
231 // If this declaration has an explicit visibility attribute, use it.
232 if (const auto *A = D->getAttr<VisibilityAttr>()) {
233 return getVisibilityFromAttr(A);
239 LinkageInfo LinkageComputer::getLVForType(const Type &T,
240 LVComputationKind computation) {
241 if (computation.IgnoreAllVisibility)
242 return LinkageInfo(T.getLinkage(), DefaultVisibility, true);
243 return getTypeLinkageAndVisibility(&T);
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.
249 LinkageInfo LinkageComputer::getLVForTemplateParameterList(
250 const TemplateParameterList *Params, LVComputationKind computation) {
252 for (const NamedDecl *P : *Params) {
253 // Template type parameters are the most common and never
254 // contribute to visibility, pack or not.
255 if (isa<TemplateTypeParmDecl>(P))
258 // Non-type template parameters can be restricted by the value type, e.g.
259 // template <enum X> class A { ... };
260 // We have to be careful here, though, because we can be dealing with
262 if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) {
263 // Handle the non-pack case first.
264 if (!NTTP->isExpandedParameterPack()) {
265 if (!NTTP->getType()->isDependentType()) {
266 LV.merge(getLVForType(*NTTP->getType(), computation));
271 // Look at all the types in an expanded pack.
272 for (unsigned i = 0, n = NTTP->getNumExpansionTypes(); i != n; ++i) {
273 QualType type = NTTP->getExpansionType(i);
274 if (!type->isDependentType())
275 LV.merge(getTypeLinkageAndVisibility(type));
280 // Template template parameters can be restricted by their
281 // template parameters, recursively.
282 const auto *TTP = cast<TemplateTemplateParmDecl>(P);
284 // Handle the non-pack case first.
285 if (!TTP->isExpandedParameterPack()) {
286 LV.merge(getLVForTemplateParameterList(TTP->getTemplateParameters(),
291 // Look at all expansions in an expanded pack.
292 for (unsigned i = 0, n = TTP->getNumExpansionTemplateParameters();
294 LV.merge(getLVForTemplateParameterList(
295 TTP->getExpansionTemplateParameters(i), computation));
302 static const Decl *getOutermostFuncOrBlockContext(const Decl *D) {
303 const Decl *Ret = nullptr;
304 const DeclContext *DC = D->getDeclContext();
305 while (DC->getDeclKind() != Decl::TranslationUnit) {
306 if (isa<FunctionDecl>(DC) || isa<BlockDecl>(DC))
307 Ret = cast<Decl>(DC);
308 DC = DC->getParent();
313 /// Get the most restrictive linkage for the types and
314 /// declarations in the given template argument list.
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.
319 LinkageComputer::getLVForTemplateArgumentList(ArrayRef<TemplateArgument> Args,
320 LVComputationKind computation) {
323 for (const TemplateArgument &Arg : Args) {
324 switch (Arg.getKind()) {
325 case TemplateArgument::Null:
326 case TemplateArgument::Integral:
327 case TemplateArgument::Expression:
330 case TemplateArgument::Type:
331 LV.merge(getLVForType(*Arg.getAsType(), computation));
334 case TemplateArgument::Declaration: {
335 const NamedDecl *ND = Arg.getAsDecl();
336 assert(!usesTypeVisibility(ND));
337 LV.merge(getLVForDecl(ND, computation));
341 case TemplateArgument::NullPtr:
342 LV.merge(getTypeLinkageAndVisibility(Arg.getNullPtrType()));
345 case TemplateArgument::Template:
346 case TemplateArgument::TemplateExpansion:
347 if (TemplateDecl *Template =
348 Arg.getAsTemplateOrTemplatePattern().getAsTemplateDecl())
349 LV.merge(getLVForDecl(Template, computation));
352 case TemplateArgument::Pack:
353 LV.merge(getLVForTemplateArgumentList(Arg.getPackAsArray(), computation));
356 llvm_unreachable("bad template argument kind");
363 LinkageComputer::getLVForTemplateArgumentList(const TemplateArgumentList &TArgs,
364 LVComputationKind computation) {
365 return getLVForTemplateArgumentList(TArgs.asArray(), computation);
368 static bool shouldConsiderTemplateVisibility(const FunctionDecl *fn,
369 const FunctionTemplateSpecializationInfo *specInfo) {
370 // Include visibility from the template parameters and arguments
371 // only if this is not an explicit instantiation or specialization
372 // with direct explicit visibility. (Implicit instantiations won't
373 // have a direct attribute.)
374 if (!specInfo->isExplicitInstantiationOrSpecialization())
377 return !fn->hasAttr<VisibilityAttr>();
380 /// Merge in template-related linkage and visibility for the given
381 /// function template specialization.
383 /// We don't need a computation kind here because we can assume
386 /// \param[out] LV the computation to use for the parent
387 void LinkageComputer::mergeTemplateLV(
388 LinkageInfo &LV, const FunctionDecl *fn,
389 const FunctionTemplateSpecializationInfo *specInfo,
390 LVComputationKind computation) {
391 bool considerVisibility =
392 shouldConsiderTemplateVisibility(fn, specInfo);
394 // Merge information from the template parameters.
395 FunctionTemplateDecl *temp = specInfo->getTemplate();
397 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
398 LV.mergeMaybeWithVisibility(tempLV, considerVisibility);
400 // Merge information from the template arguments.
401 const TemplateArgumentList &templateArgs = *specInfo->TemplateArguments;
402 LinkageInfo argsLV = getLVForTemplateArgumentList(templateArgs, computation);
403 LV.mergeMaybeWithVisibility(argsLV, considerVisibility);
406 /// Does the given declaration have a direct visibility attribute
407 /// that would match the given rules?
408 static bool hasDirectVisibilityAttribute(const NamedDecl *D,
409 LVComputationKind computation) {
410 if (computation.IgnoreAllVisibility)
413 return (computation.isTypeVisibility() && D->hasAttr<TypeVisibilityAttr>()) ||
414 D->hasAttr<VisibilityAttr>();
417 /// Should we consider visibility associated with the template
418 /// arguments and parameters of the given class template specialization?
419 static bool shouldConsiderTemplateVisibility(
420 const ClassTemplateSpecializationDecl *spec,
421 LVComputationKind computation) {
422 // Include visibility from the template parameters and arguments
423 // only if this is not an explicit instantiation or specialization
424 // with direct explicit visibility (and note that implicit
425 // instantiations won't have a direct attribute).
427 // Furthermore, we want to ignore template parameters and arguments
428 // for an explicit specialization when computing the visibility of a
429 // member thereof with explicit visibility.
431 // This is a bit complex; let's unpack it.
433 // An explicit class specialization is an independent, top-level
434 // declaration. As such, if it or any of its members has an
435 // explicit visibility attribute, that must directly express the
436 // user's intent, and we should honor it. The same logic applies to
437 // an explicit instantiation of a member of such a thing.
439 // Fast path: if this is not an explicit instantiation or
440 // specialization, we always want to consider template-related
441 // visibility restrictions.
442 if (!spec->isExplicitInstantiationOrSpecialization())
445 // This is the 'member thereof' check.
446 if (spec->isExplicitSpecialization() &&
447 hasExplicitVisibilityAlready(computation))
450 return !hasDirectVisibilityAttribute(spec, computation);
453 /// Merge in template-related linkage and visibility for the given
454 /// class template specialization.
455 void LinkageComputer::mergeTemplateLV(
456 LinkageInfo &LV, const ClassTemplateSpecializationDecl *spec,
457 LVComputationKind computation) {
458 bool considerVisibility = shouldConsiderTemplateVisibility(spec, computation);
460 // Merge information from the template parameters, but ignore
461 // visibility if we're only considering template arguments.
463 ClassTemplateDecl *temp = spec->getSpecializedTemplate();
465 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
466 LV.mergeMaybeWithVisibility(tempLV,
467 considerVisibility && !hasExplicitVisibilityAlready(computation));
469 // Merge information from the template arguments. We ignore
470 // template-argument visibility if we've got an explicit
471 // instantiation with a visibility attribute.
472 const TemplateArgumentList &templateArgs = spec->getTemplateArgs();
473 LinkageInfo argsLV = getLVForTemplateArgumentList(templateArgs, computation);
474 if (considerVisibility)
475 LV.mergeVisibility(argsLV);
476 LV.mergeExternalVisibility(argsLV);
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.
483 static bool shouldConsiderTemplateVisibility(
484 const VarTemplateSpecializationDecl *spec,
485 LVComputationKind computation) {
486 // Include visibility from the template parameters and arguments
487 // only if this is not an explicit instantiation or specialization
488 // with direct explicit visibility (and note that implicit
489 // instantiations won't have a direct attribute).
490 if (!spec->isExplicitInstantiationOrSpecialization())
493 // An explicit variable specialization is an independent, top-level
494 // declaration. As such, if it has an explicit visibility attribute,
495 // that must directly express the user's intent, and we should honor
497 if (spec->isExplicitSpecialization() &&
498 hasExplicitVisibilityAlready(computation))
501 return !hasDirectVisibilityAttribute(spec, computation);
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.
507 void LinkageComputer::mergeTemplateLV(LinkageInfo &LV,
508 const VarTemplateSpecializationDecl *spec,
509 LVComputationKind computation) {
510 bool considerVisibility = shouldConsiderTemplateVisibility(spec, computation);
512 // Merge information from the template parameters, but ignore
513 // visibility if we're only considering template arguments.
515 VarTemplateDecl *temp = spec->getSpecializedTemplate();
517 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
518 LV.mergeMaybeWithVisibility(tempLV,
519 considerVisibility && !hasExplicitVisibilityAlready(computation));
521 // Merge information from the template arguments. We ignore
522 // template-argument visibility if we've got an explicit
523 // instantiation with a visibility attribute.
524 const TemplateArgumentList &templateArgs = spec->getTemplateArgs();
525 LinkageInfo argsLV = getLVForTemplateArgumentList(templateArgs, computation);
526 if (considerVisibility)
527 LV.mergeVisibility(argsLV);
528 LV.mergeExternalVisibility(argsLV);
531 static bool useInlineVisibilityHidden(const NamedDecl *D) {
532 // FIXME: we should warn if -fvisibility-inlines-hidden is used with c.
533 const LangOptions &Opts = D->getASTContext().getLangOpts();
534 if (!Opts.CPlusPlus || !Opts.InlineVisibilityHidden)
537 const auto *FD = dyn_cast<FunctionDecl>(D);
541 TemplateSpecializationKind TSK = TSK_Undeclared;
542 if (FunctionTemplateSpecializationInfo *spec
543 = FD->getTemplateSpecializationInfo()) {
544 TSK = spec->getTemplateSpecializationKind();
545 } else if (MemberSpecializationInfo *MSI =
546 FD->getMemberSpecializationInfo()) {
547 TSK = MSI->getTemplateSpecializationKind();
550 const FunctionDecl *Def = nullptr;
551 // InlineVisibilityHidden only applies to definitions, and
552 // isInlined() only gives meaningful answers on definitions
554 return TSK != TSK_ExplicitInstantiationDeclaration &&
555 TSK != TSK_ExplicitInstantiationDefinition &&
556 FD->hasBody(Def) && Def->isInlined() && !Def->hasAttr<GNUInlineAttr>();
559 template <typename T> static bool isFirstInExternCContext(T *D) {
560 const T *First = D->getFirstDecl();
561 return First->isInExternCContext();
564 static bool isSingleLineLanguageLinkage(const Decl &D) {
565 if (const auto *SD = dyn_cast<LinkageSpecDecl>(D.getDeclContext()))
566 if (!SD->hasBraces())
571 static bool isExportedFromModuleIntefaceUnit(const NamedDecl *D) {
572 // FIXME: Handle isModulePrivate.
573 switch (D->getModuleOwnershipKind()) {
574 case Decl::ModuleOwnershipKind::Unowned:
575 case Decl::ModuleOwnershipKind::ModulePrivate:
577 case Decl::ModuleOwnershipKind::Visible:
578 case Decl::ModuleOwnershipKind::VisibleWhenImported:
579 if (auto *M = D->getOwningModule())
580 return M->Kind == Module::ModuleInterfaceUnit;
582 llvm_unreachable("unexpected module ownership kind");
585 static LinkageInfo getInternalLinkageFor(const NamedDecl *D) {
586 // Internal linkage declarations within a module interface unit are modeled
587 // as "module-internal linkage", which means that they have internal linkage
588 // formally but can be indirectly accessed from outside the module via inline
589 // functions and templates defined within the module.
590 if (auto *M = D->getOwningModule())
591 if (M->Kind == Module::ModuleInterfaceUnit)
592 return LinkageInfo(ModuleInternalLinkage, DefaultVisibility, false);
594 return LinkageInfo::internal();
597 static LinkageInfo getExternalLinkageFor(const NamedDecl *D) {
598 // C++ Modules TS [basic.link]/6.8:
599 // - A name declared at namespace scope that does not have internal linkage
600 // by the previous rules and that is introduced by a non-exported
601 // declaration has module linkage.
602 if (auto *M = D->getOwningModule())
603 if (M->Kind == Module::ModuleInterfaceUnit)
604 if (!isExportedFromModuleIntefaceUnit(
605 cast<NamedDecl>(D->getCanonicalDecl())))
606 return LinkageInfo(ModuleLinkage, DefaultVisibility, false);
608 return LinkageInfo::external();
612 LinkageComputer::getLVForNamespaceScopeDecl(const NamedDecl *D,
613 LVComputationKind computation,
614 bool IgnoreVarTypeLinkage) {
615 assert(D->getDeclContext()->getRedeclContext()->isFileContext() &&
616 "Not a name having namespace scope");
617 ASTContext &Context = D->getASTContext();
619 // C++ [basic.link]p3:
620 // A name having namespace scope (3.3.6) has internal linkage if it
622 // - an object, reference, function or function template that is
623 // explicitly declared static; or,
624 // (This bullet corresponds to C99 6.2.2p3.)
625 if (const auto *Var = dyn_cast<VarDecl>(D)) {
626 // Explicitly declared static.
627 if (Var->getStorageClass() == SC_Static)
628 return getInternalLinkageFor(Var);
630 // - a non-inline, non-volatile object or reference that is explicitly
631 // declared const or constexpr and neither explicitly declared extern
632 // nor previously declared to have external linkage; or (there is no
633 // equivalent in C99)
634 // The C++ modules TS adds "non-exported" to this list.
635 if (Context.getLangOpts().CPlusPlus &&
636 Var->getType().isConstQualified() &&
637 !Var->getType().isVolatileQualified() &&
639 !isExportedFromModuleIntefaceUnit(Var)) {
640 const VarDecl *PrevVar = Var->getPreviousDecl();
642 return getLVForDecl(PrevVar, computation);
644 if (Var->getStorageClass() != SC_Extern &&
645 Var->getStorageClass() != SC_PrivateExtern &&
646 !isSingleLineLanguageLinkage(*Var))
647 return getInternalLinkageFor(Var);
650 for (const VarDecl *PrevVar = Var->getPreviousDecl(); PrevVar;
651 PrevVar = PrevVar->getPreviousDecl()) {
652 if (PrevVar->getStorageClass() == SC_PrivateExtern &&
653 Var->getStorageClass() == SC_None)
654 return getDeclLinkageAndVisibility(PrevVar);
655 // Explicitly declared static.
656 if (PrevVar->getStorageClass() == SC_Static)
657 return getInternalLinkageFor(Var);
659 } else if (const FunctionDecl *Function = D->getAsFunction()) {
661 // A non-member function template can have internal linkage; any
662 // other template name shall have external linkage.
664 // Explicitly declared static.
665 if (Function->getCanonicalDecl()->getStorageClass() == SC_Static)
666 return getInternalLinkageFor(Function);
667 } else if (const auto *IFD = dyn_cast<IndirectFieldDecl>(D)) {
668 // - a data member of an anonymous union.
669 const VarDecl *VD = IFD->getVarDecl();
670 assert(VD && "Expected a VarDecl in this IndirectFieldDecl!");
671 return getLVForNamespaceScopeDecl(VD, computation, IgnoreVarTypeLinkage);
673 assert(!isa<FieldDecl>(D) && "Didn't expect a FieldDecl!");
675 if (D->isInAnonymousNamespace()) {
676 const auto *Var = dyn_cast<VarDecl>(D);
677 const auto *Func = dyn_cast<FunctionDecl>(D);
678 // FIXME: The check for extern "C" here is not justified by the standard
679 // wording, but we retain it from the pre-DR1113 model to avoid breaking
682 // C++11 [basic.link]p4:
683 // An unnamed namespace or a namespace declared directly or indirectly
684 // within an unnamed namespace has internal linkage.
685 if ((!Var || !isFirstInExternCContext(Var)) &&
686 (!Func || !isFirstInExternCContext(Func)))
687 return getInternalLinkageFor(D);
690 // Set up the defaults.
693 // If the declaration of an identifier for an object has file
694 // scope and no storage-class specifier, its linkage is
696 LinkageInfo LV = getExternalLinkageFor(D);
698 if (!hasExplicitVisibilityAlready(computation)) {
699 if (Optional<Visibility> Vis = getExplicitVisibility(D, computation)) {
700 LV.mergeVisibility(*Vis, true);
702 // If we're declared in a namespace with a visibility attribute,
703 // use that namespace's visibility, and it still counts as explicit.
704 for (const DeclContext *DC = D->getDeclContext();
705 !isa<TranslationUnitDecl>(DC);
706 DC = DC->getParent()) {
707 const auto *ND = dyn_cast<NamespaceDecl>(DC);
709 if (Optional<Visibility> Vis = getExplicitVisibility(ND, computation)) {
710 LV.mergeVisibility(*Vis, true);
716 // Add in global settings if the above didn't give us direct visibility.
717 if (!LV.isVisibilityExplicit()) {
718 // Use global type/value visibility as appropriate.
719 Visibility globalVisibility =
720 computation.isValueVisibility()
721 ? Context.getLangOpts().getValueVisibilityMode()
722 : Context.getLangOpts().getTypeVisibilityMode();
723 LV.mergeVisibility(globalVisibility, /*explicit*/ false);
725 // If we're paying attention to global visibility, apply
726 // -finline-visibility-hidden if this is an inline method.
727 if (useInlineVisibilityHidden(D))
728 LV.mergeVisibility(HiddenVisibility, true);
732 // C++ [basic.link]p4:
734 // A name having namespace scope has external linkage if it is the
737 // - an object or reference, unless it has internal linkage; or
738 if (const auto *Var = dyn_cast<VarDecl>(D)) {
739 // GCC applies the following optimization to variables and static
740 // data members, but not to functions:
742 // Modify the variable's LV by the LV of its type unless this is
743 // C or extern "C". This follows from [basic.link]p9:
744 // A type without linkage shall not be used as the type of a
745 // variable or function with external linkage unless
746 // - the entity has C language linkage, or
747 // - the entity is declared within an unnamed namespace, or
748 // - the entity is not used or is defined in the same
750 // and [basic.link]p10:
751 // ...the types specified by all declarations referring to a
752 // given variable or function shall be identical...
753 // C does not have an equivalent rule.
755 // Ignore this if we've got an explicit attribute; the user
756 // probably knows what they're doing.
758 // Note that we don't want to make the variable non-external
759 // because of this, but unique-external linkage suits us.
760 if (Context.getLangOpts().CPlusPlus && !isFirstInExternCContext(Var) &&
761 !IgnoreVarTypeLinkage) {
762 LinkageInfo TypeLV = getLVForType(*Var->getType(), computation);
763 if (!isExternallyVisible(TypeLV.getLinkage()))
764 return LinkageInfo::uniqueExternal();
765 if (!LV.isVisibilityExplicit())
766 LV.mergeVisibility(TypeLV);
769 if (Var->getStorageClass() == SC_PrivateExtern)
770 LV.mergeVisibility(HiddenVisibility, true);
772 // Note that Sema::MergeVarDecl already takes care of implementing
773 // C99 6.2.2p4 and propagating the visibility attribute, so we don't have
776 // As per function and class template specializations (below),
777 // consider LV for the template and template arguments. We're at file
778 // scope, so we do not need to worry about nested specializations.
779 if (const auto *spec = dyn_cast<VarTemplateSpecializationDecl>(Var)) {
780 mergeTemplateLV(LV, spec, computation);
783 // - a function, unless it has internal linkage; or
784 } else if (const auto *Function = dyn_cast<FunctionDecl>(D)) {
785 // In theory, we can modify the function's LV by the LV of its
786 // type unless it has C linkage (see comment above about variables
787 // for justification). In practice, GCC doesn't do this, so it's
788 // just too painful to make work.
790 if (Function->getStorageClass() == SC_PrivateExtern)
791 LV.mergeVisibility(HiddenVisibility, true);
793 // Note that Sema::MergeCompatibleFunctionDecls already takes care of
794 // merging storage classes and visibility attributes, so we don't have to
795 // look at previous decls in here.
797 // In C++, then if the type of the function uses a type with
798 // unique-external linkage, it's not legally usable from outside
799 // this translation unit. However, we should use the C linkage
800 // rules instead for extern "C" declarations.
801 if (Context.getLangOpts().CPlusPlus && !isFirstInExternCContext(Function)) {
802 // Only look at the type-as-written. Otherwise, deducing the return type
803 // of a function could change its linkage.
804 QualType TypeAsWritten = Function->getType();
805 if (TypeSourceInfo *TSI = Function->getTypeSourceInfo())
806 TypeAsWritten = TSI->getType();
807 if (!isExternallyVisible(TypeAsWritten->getLinkage()))
808 return LinkageInfo::uniqueExternal();
811 // Consider LV from the template and the template arguments.
812 // We're at file scope, so we do not need to worry about nested
814 if (FunctionTemplateSpecializationInfo *specInfo
815 = Function->getTemplateSpecializationInfo()) {
816 mergeTemplateLV(LV, Function, specInfo, computation);
819 // - a named class (Clause 9), or an unnamed class defined in a
820 // typedef declaration in which the class has the typedef name
821 // for linkage purposes (7.1.3); or
822 // - a named enumeration (7.2), or an unnamed enumeration
823 // defined in a typedef declaration in which the enumeration
824 // has the typedef name for linkage purposes (7.1.3); or
825 } else if (const auto *Tag = dyn_cast<TagDecl>(D)) {
826 // Unnamed tags have no linkage.
827 if (!Tag->hasNameForLinkage())
828 return LinkageInfo::none();
830 // If this is a class template specialization, consider the
831 // linkage of the template and template arguments. We're at file
832 // scope, so we do not need to worry about nested specializations.
833 if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(Tag)) {
834 mergeTemplateLV(LV, spec, computation);
837 // - an enumerator belonging to an enumeration with external linkage;
838 } else if (isa<EnumConstantDecl>(D)) {
839 LinkageInfo EnumLV = getLVForDecl(cast<NamedDecl>(D->getDeclContext()),
841 if (!isExternalFormalLinkage(EnumLV.getLinkage()))
842 return LinkageInfo::none();
845 // - a template, unless it is a function template that has
846 // internal linkage (Clause 14);
847 } else if (const auto *temp = dyn_cast<TemplateDecl>(D)) {
848 bool considerVisibility = !hasExplicitVisibilityAlready(computation);
850 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
851 LV.mergeMaybeWithVisibility(tempLV, considerVisibility);
853 // - a namespace (7.3), unless it is declared within an unnamed
856 // We handled names in anonymous namespaces above.
857 } else if (isa<NamespaceDecl>(D)) {
860 // By extension, we assign external linkage to Objective-C
862 } else if (isa<ObjCInterfaceDecl>(D)) {
865 } else if (auto *TD = dyn_cast<TypedefNameDecl>(D)) {
866 // A typedef declaration has linkage if it gives a type a name for
868 if (!TD->getAnonDeclWithTypedefName(/*AnyRedecl*/true))
869 return LinkageInfo::none();
871 // Everything not covered here has no linkage.
873 return LinkageInfo::none();
876 // If we ended up with non-externally-visible linkage, visibility should
877 // always be default.
878 if (!isExternallyVisible(LV.getLinkage()))
879 return LinkageInfo(LV.getLinkage(), DefaultVisibility, false);
885 LinkageComputer::getLVForClassMember(const NamedDecl *D,
886 LVComputationKind computation,
887 bool IgnoreVarTypeLinkage) {
888 // Only certain class members have linkage. Note that fields don't
889 // really have linkage, but it's convenient to say they do for the
890 // purposes of calculating linkage of pointer-to-data-member
891 // template arguments.
893 // Templates also don't officially have linkage, but since we ignore
894 // the C++ standard and look at template arguments when determining
895 // linkage and visibility of a template specialization, we might hit
896 // a template template argument that way. If we do, we need to
897 // consider its linkage.
898 if (!(isa<CXXMethodDecl>(D) ||
901 isa<IndirectFieldDecl>(D) ||
903 isa<TemplateDecl>(D)))
904 return LinkageInfo::none();
908 // If we have an explicit visibility attribute, merge that in.
909 if (!hasExplicitVisibilityAlready(computation)) {
910 if (Optional<Visibility> Vis = getExplicitVisibility(D, computation))
911 LV.mergeVisibility(*Vis, true);
912 // If we're paying attention to global visibility, apply
913 // -finline-visibility-hidden if this is an inline method.
915 // Note that we do this before merging information about
916 // the class visibility.
917 if (!LV.isVisibilityExplicit() && useInlineVisibilityHidden(D))
918 LV.mergeVisibility(HiddenVisibility, true);
921 // If this class member has an explicit visibility attribute, the only
922 // thing that can change its visibility is the template arguments, so
923 // only look for them when processing the class.
924 LVComputationKind classComputation = computation;
925 if (LV.isVisibilityExplicit())
926 classComputation = withExplicitVisibilityAlready(computation);
928 LinkageInfo classLV =
929 getLVForDecl(cast<RecordDecl>(D->getDeclContext()), classComputation);
930 // The member has the same linkage as the class. If that's not externally
931 // visible, we don't need to compute anything about the linkage.
932 // FIXME: If we're only computing linkage, can we bail out here?
933 if (!isExternallyVisible(classLV.getLinkage()))
937 // Otherwise, don't merge in classLV yet, because in certain cases
938 // we need to completely ignore the visibility from it.
940 // Specifically, if this decl exists and has an explicit attribute.
941 const NamedDecl *explicitSpecSuppressor = nullptr;
943 if (const auto *MD = dyn_cast<CXXMethodDecl>(D)) {
944 // Only look at the type-as-written. Otherwise, deducing the return type
945 // of a function could change its linkage.
946 QualType TypeAsWritten = MD->getType();
947 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo())
948 TypeAsWritten = TSI->getType();
949 if (!isExternallyVisible(TypeAsWritten->getLinkage()))
950 return LinkageInfo::uniqueExternal();
952 // If this is a method template specialization, use the linkage for
953 // the template parameters and arguments.
954 if (FunctionTemplateSpecializationInfo *spec
955 = MD->getTemplateSpecializationInfo()) {
956 mergeTemplateLV(LV, MD, spec, computation);
957 if (spec->isExplicitSpecialization()) {
958 explicitSpecSuppressor = MD;
959 } else if (isExplicitMemberSpecialization(spec->getTemplate())) {
960 explicitSpecSuppressor = spec->getTemplate()->getTemplatedDecl();
962 } else if (isExplicitMemberSpecialization(MD)) {
963 explicitSpecSuppressor = MD;
966 } else if (const auto *RD = dyn_cast<CXXRecordDecl>(D)) {
967 if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(RD)) {
968 mergeTemplateLV(LV, spec, computation);
969 if (spec->isExplicitSpecialization()) {
970 explicitSpecSuppressor = spec;
972 const ClassTemplateDecl *temp = spec->getSpecializedTemplate();
973 if (isExplicitMemberSpecialization(temp)) {
974 explicitSpecSuppressor = temp->getTemplatedDecl();
977 } else if (isExplicitMemberSpecialization(RD)) {
978 explicitSpecSuppressor = RD;
981 // Static data members.
982 } else if (const auto *VD = dyn_cast<VarDecl>(D)) {
983 if (const auto *spec = dyn_cast<VarTemplateSpecializationDecl>(VD))
984 mergeTemplateLV(LV, spec, computation);
986 // Modify the variable's linkage by its type, but ignore the
987 // type's visibility unless it's a definition.
988 if (!IgnoreVarTypeLinkage) {
989 LinkageInfo typeLV = getLVForType(*VD->getType(), computation);
990 // FIXME: If the type's linkage is not externally visible, we can
991 // give this static data member UniqueExternalLinkage.
992 if (!LV.isVisibilityExplicit() && !classLV.isVisibilityExplicit())
993 LV.mergeVisibility(typeLV);
994 LV.mergeExternalVisibility(typeLV);
997 if (isExplicitMemberSpecialization(VD)) {
998 explicitSpecSuppressor = VD;
1001 // Template members.
1002 } else if (const auto *temp = dyn_cast<TemplateDecl>(D)) {
1003 bool considerVisibility =
1004 (!LV.isVisibilityExplicit() &&
1005 !classLV.isVisibilityExplicit() &&
1006 !hasExplicitVisibilityAlready(computation));
1007 LinkageInfo tempLV =
1008 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
1009 LV.mergeMaybeWithVisibility(tempLV, considerVisibility);
1011 if (const auto *redeclTemp = dyn_cast<RedeclarableTemplateDecl>(temp)) {
1012 if (isExplicitMemberSpecialization(redeclTemp)) {
1013 explicitSpecSuppressor = temp->getTemplatedDecl();
1018 // We should never be looking for an attribute directly on a template.
1019 assert(!explicitSpecSuppressor || !isa<TemplateDecl>(explicitSpecSuppressor));
1021 // If this member is an explicit member specialization, and it has
1022 // an explicit attribute, ignore visibility from the parent.
1023 bool considerClassVisibility = true;
1024 if (explicitSpecSuppressor &&
1025 // optimization: hasDVA() is true only with explicit visibility.
1026 LV.isVisibilityExplicit() &&
1027 classLV.getVisibility() != DefaultVisibility &&
1028 hasDirectVisibilityAttribute(explicitSpecSuppressor, computation)) {
1029 considerClassVisibility = false;
1032 // Finally, merge in information from the class.
1033 LV.mergeMaybeWithVisibility(classLV, considerClassVisibility);
1037 void NamedDecl::anchor() {}
1039 bool NamedDecl::isLinkageValid() const {
1040 if (!hasCachedLinkage())
1043 Linkage L = LinkageComputer{}
1044 .computeLVForDecl(this, LVComputationKind::forLinkageOnly())
1046 return L == getCachedLinkage();
1049 ObjCStringFormatFamily NamedDecl::getObjCFStringFormattingFamily() const {
1050 StringRef name = getName();
1051 if (name.empty()) return SFF_None;
1053 if (name.front() == 'C')
1054 if (name == "CFStringCreateWithFormat" ||
1055 name == "CFStringCreateWithFormatAndArguments" ||
1056 name == "CFStringAppendFormat" ||
1057 name == "CFStringAppendFormatAndArguments")
1058 return SFF_CFString;
1062 Linkage NamedDecl::getLinkageInternal() const {
1063 // We don't care about visibility here, so ask for the cheapest
1064 // possible visibility analysis.
1065 return LinkageComputer{}
1066 .getLVForDecl(this, LVComputationKind::forLinkageOnly())
1070 LinkageInfo NamedDecl::getLinkageAndVisibility() const {
1071 return LinkageComputer{}.getDeclLinkageAndVisibility(this);
1074 static Optional<Visibility>
1075 getExplicitVisibilityAux(const NamedDecl *ND,
1076 NamedDecl::ExplicitVisibilityKind kind,
1077 bool IsMostRecent) {
1078 assert(!IsMostRecent || ND == ND->getMostRecentDecl());
1080 // Check the declaration itself first.
1081 if (Optional<Visibility> V = getVisibilityOf(ND, kind))
1084 // If this is a member class of a specialization of a class template
1085 // and the corresponding decl has explicit visibility, use that.
1086 if (const auto *RD = dyn_cast<CXXRecordDecl>(ND)) {
1087 CXXRecordDecl *InstantiatedFrom = RD->getInstantiatedFromMemberClass();
1088 if (InstantiatedFrom)
1089 return getVisibilityOf(InstantiatedFrom, kind);
1092 // If there wasn't explicit visibility there, and this is a
1093 // specialization of a class template, check for visibility
1095 if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(ND)) {
1096 // Walk all the template decl till this point to see if there are
1097 // explicit visibility attributes.
1098 const auto *TD = spec->getSpecializedTemplate()->getTemplatedDecl();
1099 while (TD != nullptr) {
1100 auto Vis = getVisibilityOf(TD, kind);
1103 TD = TD->getPreviousDecl();
1108 // Use the most recent declaration.
1109 if (!IsMostRecent && !isa<NamespaceDecl>(ND)) {
1110 const NamedDecl *MostRecent = ND->getMostRecentDecl();
1111 if (MostRecent != ND)
1112 return getExplicitVisibilityAux(MostRecent, kind, true);
1115 if (const auto *Var = dyn_cast<VarDecl>(ND)) {
1116 if (Var->isStaticDataMember()) {
1117 VarDecl *InstantiatedFrom = Var->getInstantiatedFromStaticDataMember();
1118 if (InstantiatedFrom)
1119 return getVisibilityOf(InstantiatedFrom, kind);
1122 if (const auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(Var))
1123 return getVisibilityOf(VTSD->getSpecializedTemplate()->getTemplatedDecl(),
1128 // Also handle function template specializations.
1129 if (const auto *fn = dyn_cast<FunctionDecl>(ND)) {
1130 // If the function is a specialization of a template with an
1131 // explicit visibility attribute, use that.
1132 if (FunctionTemplateSpecializationInfo *templateInfo
1133 = fn->getTemplateSpecializationInfo())
1134 return getVisibilityOf(templateInfo->getTemplate()->getTemplatedDecl(),
1137 // If the function is a member of a specialization of a class template
1138 // and the corresponding decl has explicit visibility, use that.
1139 FunctionDecl *InstantiatedFrom = fn->getInstantiatedFromMemberFunction();
1140 if (InstantiatedFrom)
1141 return getVisibilityOf(InstantiatedFrom, kind);
1146 // The visibility of a template is stored in the templated decl.
1147 if (const auto *TD = dyn_cast<TemplateDecl>(ND))
1148 return getVisibilityOf(TD->getTemplatedDecl(), kind);
1153 Optional<Visibility>
1154 NamedDecl::getExplicitVisibility(ExplicitVisibilityKind kind) const {
1155 return getExplicitVisibilityAux(this, kind, false);
1158 LinkageInfo LinkageComputer::getLVForClosure(const DeclContext *DC,
1160 LVComputationKind computation) {
1161 // This lambda has its linkage/visibility determined by its owner.
1162 const NamedDecl *Owner;
1164 Owner = dyn_cast<NamedDecl>(DC);
1165 else if (isa<ParmVarDecl>(ContextDecl))
1167 dyn_cast<NamedDecl>(ContextDecl->getDeclContext()->getRedeclContext());
1169 Owner = cast<NamedDecl>(ContextDecl);
1172 return LinkageInfo::none();
1174 // If the owner has a deduced type, we need to skip querying the linkage and
1175 // visibility of that type, because it might involve this closure type. The
1176 // only effect of this is that we might give a lambda VisibleNoLinkage rather
1177 // than NoLinkage when we don't strictly need to, which is benign.
1178 auto *VD = dyn_cast<VarDecl>(Owner);
1179 LinkageInfo OwnerLV =
1180 VD && VD->getType()->getContainedDeducedType()
1181 ? computeLVForDecl(Owner, computation, /*IgnoreVarTypeLinkage*/true)
1182 : getLVForDecl(Owner, computation);
1184 // A lambda never formally has linkage. But if the owner is externally
1185 // visible, then the lambda is too. We apply the same rules to blocks.
1186 if (!isExternallyVisible(OwnerLV.getLinkage()))
1187 return LinkageInfo::none();
1188 return LinkageInfo(VisibleNoLinkage, OwnerLV.getVisibility(),
1189 OwnerLV.isVisibilityExplicit());
1192 LinkageInfo LinkageComputer::getLVForLocalDecl(const NamedDecl *D,
1193 LVComputationKind computation) {
1194 if (const auto *Function = dyn_cast<FunctionDecl>(D)) {
1195 if (Function->isInAnonymousNamespace() &&
1196 !isFirstInExternCContext(Function))
1197 return getInternalLinkageFor(Function);
1199 // This is a "void f();" which got merged with a file static.
1200 if (Function->getCanonicalDecl()->getStorageClass() == SC_Static)
1201 return getInternalLinkageFor(Function);
1204 if (!hasExplicitVisibilityAlready(computation)) {
1205 if (Optional<Visibility> Vis =
1206 getExplicitVisibility(Function, computation))
1207 LV.mergeVisibility(*Vis, true);
1210 // Note that Sema::MergeCompatibleFunctionDecls already takes care of
1211 // merging storage classes and visibility attributes, so we don't have to
1212 // look at previous decls in here.
1217 if (const auto *Var = dyn_cast<VarDecl>(D)) {
1218 if (Var->hasExternalStorage()) {
1219 if (Var->isInAnonymousNamespace() && !isFirstInExternCContext(Var))
1220 return getInternalLinkageFor(Var);
1223 if (Var->getStorageClass() == SC_PrivateExtern)
1224 LV.mergeVisibility(HiddenVisibility, true);
1225 else if (!hasExplicitVisibilityAlready(computation)) {
1226 if (Optional<Visibility> Vis = getExplicitVisibility(Var, computation))
1227 LV.mergeVisibility(*Vis, true);
1230 if (const VarDecl *Prev = Var->getPreviousDecl()) {
1231 LinkageInfo PrevLV = getLVForDecl(Prev, computation);
1232 if (PrevLV.getLinkage())
1233 LV.setLinkage(PrevLV.getLinkage());
1234 LV.mergeVisibility(PrevLV);
1240 if (!Var->isStaticLocal())
1241 return LinkageInfo::none();
1244 ASTContext &Context = D->getASTContext();
1245 if (!Context.getLangOpts().CPlusPlus)
1246 return LinkageInfo::none();
1248 const Decl *OuterD = getOutermostFuncOrBlockContext(D);
1249 if (!OuterD || OuterD->isInvalidDecl())
1250 return LinkageInfo::none();
1253 if (const auto *BD = dyn_cast<BlockDecl>(OuterD)) {
1254 if (!BD->getBlockManglingNumber())
1255 return LinkageInfo::none();
1257 LV = getLVForClosure(BD->getDeclContext()->getRedeclContext(),
1258 BD->getBlockManglingContextDecl(), computation);
1260 const auto *FD = cast<FunctionDecl>(OuterD);
1261 if (!FD->isInlined() &&
1262 !isTemplateInstantiation(FD->getTemplateSpecializationKind()))
1263 return LinkageInfo::none();
1265 LV = getLVForDecl(FD, computation);
1267 if (!isExternallyVisible(LV.getLinkage()))
1268 return LinkageInfo::none();
1269 return LinkageInfo(VisibleNoLinkage, LV.getVisibility(),
1270 LV.isVisibilityExplicit());
1273 static inline const CXXRecordDecl*
1274 getOutermostEnclosingLambda(const CXXRecordDecl *Record) {
1275 const CXXRecordDecl *Ret = Record;
1276 while (Record && Record->isLambda()) {
1278 if (!Record->getParent()) break;
1279 // Get the Containing Class of this Lambda Class
1280 Record = dyn_cast_or_null<CXXRecordDecl>(
1281 Record->getParent()->getParent());
1286 LinkageInfo LinkageComputer::computeLVForDecl(const NamedDecl *D,
1287 LVComputationKind computation,
1288 bool IgnoreVarTypeLinkage) {
1289 // Internal_linkage attribute overrides other considerations.
1290 if (D->hasAttr<InternalLinkageAttr>())
1291 return getInternalLinkageFor(D);
1293 // Objective-C: treat all Objective-C declarations as having external
1295 switch (D->getKind()) {
1299 // Per C++ [basic.link]p2, only the names of objects, references,
1300 // functions, types, templates, namespaces, and values ever have linkage.
1302 // Note that the name of a typedef, namespace alias, using declaration,
1303 // and so on are not the name of the corresponding type, namespace, or
1304 // declaration, so they do *not* have linkage.
1305 case Decl::ImplicitParam:
1307 case Decl::NamespaceAlias:
1310 case Decl::UsingShadow:
1311 case Decl::UsingDirective:
1312 return LinkageInfo::none();
1314 case Decl::EnumConstant:
1315 // C++ [basic.link]p4: an enumerator has the linkage of its enumeration.
1316 if (D->getASTContext().getLangOpts().CPlusPlus)
1317 return getLVForDecl(cast<EnumDecl>(D->getDeclContext()), computation);
1318 return LinkageInfo::visible_none();
1321 case Decl::TypeAlias:
1322 // A typedef declaration has linkage if it gives a type a name for
1323 // linkage purposes.
1324 if (!cast<TypedefNameDecl>(D)
1325 ->getAnonDeclWithTypedefName(/*AnyRedecl*/true))
1326 return LinkageInfo::none();
1329 case Decl::TemplateTemplateParm: // count these as external
1330 case Decl::NonTypeTemplateParm:
1331 case Decl::ObjCAtDefsField:
1332 case Decl::ObjCCategory:
1333 case Decl::ObjCCategoryImpl:
1334 case Decl::ObjCCompatibleAlias:
1335 case Decl::ObjCImplementation:
1336 case Decl::ObjCMethod:
1337 case Decl::ObjCProperty:
1338 case Decl::ObjCPropertyImpl:
1339 case Decl::ObjCProtocol:
1340 return getExternalLinkageFor(D);
1342 case Decl::CXXRecord: {
1343 const auto *Record = cast<CXXRecordDecl>(D);
1344 if (Record->isLambda()) {
1345 if (!Record->getLambdaManglingNumber()) {
1346 // This lambda has no mangling number, so it's internal.
1347 return getInternalLinkageFor(D);
1350 // This lambda has its linkage/visibility determined:
1351 // - either by the outermost lambda if that lambda has no mangling
1353 // - or by the parent of the outer most lambda
1354 // This prevents infinite recursion in settings such as nested lambdas
1355 // used in NSDMI's, for e.g.
1358 // int t2 = ([](int a) { return [](int b) { return b; };})(t)(t);
1360 const CXXRecordDecl *OuterMostLambda =
1361 getOutermostEnclosingLambda(Record);
1362 if (!OuterMostLambda->getLambdaManglingNumber())
1363 return getInternalLinkageFor(D);
1365 return getLVForClosure(
1366 OuterMostLambda->getDeclContext()->getRedeclContext(),
1367 OuterMostLambda->getLambdaContextDecl(), computation);
1374 // Handle linkage for namespace-scope names.
1375 if (D->getDeclContext()->getRedeclContext()->isFileContext())
1376 return getLVForNamespaceScopeDecl(D, computation, IgnoreVarTypeLinkage);
1378 // C++ [basic.link]p5:
1379 // In addition, a member function, static data member, a named
1380 // class or enumeration of class scope, or an unnamed class or
1381 // enumeration defined in a class-scope typedef declaration such
1382 // that the class or enumeration has the typedef name for linkage
1383 // purposes (7.1.3), has external linkage if the name of the class
1384 // has external linkage.
1385 if (D->getDeclContext()->isRecord())
1386 return getLVForClassMember(D, computation, IgnoreVarTypeLinkage);
1388 // C++ [basic.link]p6:
1389 // The name of a function declared in block scope and the name of
1390 // an object declared by a block scope extern declaration have
1391 // linkage. If there is a visible declaration of an entity with
1392 // linkage having the same name and type, ignoring entities
1393 // declared outside the innermost enclosing namespace scope, the
1394 // block scope declaration declares that same entity and receives
1395 // the linkage of the previous declaration. If there is more than
1396 // one such matching entity, the program is ill-formed. Otherwise,
1397 // if no matching entity is found, the block scope entity receives
1398 // external linkage.
1399 if (D->getDeclContext()->isFunctionOrMethod())
1400 return getLVForLocalDecl(D, computation);
1402 // C++ [basic.link]p6:
1403 // Names not covered by these rules have no linkage.
1404 return LinkageInfo::none();
1407 /// getLVForDecl - Get the linkage and visibility for the given declaration.
1408 LinkageInfo LinkageComputer::getLVForDecl(const NamedDecl *D,
1409 LVComputationKind computation) {
1410 // Internal_linkage attribute overrides other considerations.
1411 if (D->hasAttr<InternalLinkageAttr>())
1412 return getInternalLinkageFor(D);
1414 if (computation.IgnoreAllVisibility && D->hasCachedLinkage())
1415 return LinkageInfo(D->getCachedLinkage(), DefaultVisibility, false);
1417 if (llvm::Optional<LinkageInfo> LI = lookup(D, computation))
1420 LinkageInfo LV = computeLVForDecl(D, computation);
1421 if (D->hasCachedLinkage())
1422 assert(D->getCachedLinkage() == LV.getLinkage());
1424 D->setCachedLinkage(LV.getLinkage());
1425 cache(D, computation, LV);
1428 // In C (because of gnu inline) and in c++ with microsoft extensions an
1429 // static can follow an extern, so we can have two decls with different
1431 const LangOptions &Opts = D->getASTContext().getLangOpts();
1432 if (!Opts.CPlusPlus || Opts.MicrosoftExt)
1435 // We have just computed the linkage for this decl. By induction we know
1436 // that all other computed linkages match, check that the one we just
1437 // computed also does.
1438 NamedDecl *Old = nullptr;
1439 for (auto I : D->redecls()) {
1440 auto *T = cast<NamedDecl>(I);
1443 if (!T->isInvalidDecl() && T->hasCachedLinkage()) {
1448 assert(!Old || Old->getCachedLinkage() == D->getCachedLinkage());
1454 LinkageInfo LinkageComputer::getDeclLinkageAndVisibility(const NamedDecl *D) {
1455 return getLVForDecl(D,
1456 LVComputationKind(usesTypeVisibility(D)
1457 ? NamedDecl::VisibilityForType
1458 : NamedDecl::VisibilityForValue));
1461 Module *Decl::getOwningModuleForLinkage(bool IgnoreLinkage) const {
1462 Module *M = getOwningModule();
1467 case Module::ModuleMapModule:
1468 // Module map modules have no special linkage semantics.
1471 case Module::ModuleInterfaceUnit:
1474 case Module::GlobalModuleFragment: {
1475 // External linkage declarations in the global module have no owning module
1476 // for linkage purposes. But internal linkage declarations in the global
1477 // module fragment of a particular module are owned by that module for
1478 // linkage purposes.
1481 bool InternalLinkage;
1482 if (auto *ND = dyn_cast<NamedDecl>(this))
1483 InternalLinkage = !ND->hasExternalFormalLinkage();
1485 auto *NSD = dyn_cast<NamespaceDecl>(this);
1486 InternalLinkage = (NSD && NSD->isAnonymousNamespace()) ||
1487 isInAnonymousNamespace();
1489 return InternalLinkage ? M->Parent : nullptr;
1493 llvm_unreachable("unknown module kind");
1496 void NamedDecl::printName(raw_ostream &os) const {
1500 std::string NamedDecl::getQualifiedNameAsString() const {
1501 std::string QualName;
1502 llvm::raw_string_ostream OS(QualName);
1503 printQualifiedName(OS, getASTContext().getPrintingPolicy());
1507 void NamedDecl::printQualifiedName(raw_ostream &OS) const {
1508 printQualifiedName(OS, getASTContext().getPrintingPolicy());
1511 void NamedDecl::printQualifiedName(raw_ostream &OS,
1512 const PrintingPolicy &P) const {
1513 const DeclContext *Ctx = getDeclContext();
1515 // For ObjC methods, look through categories and use the interface as context.
1516 if (auto *MD = dyn_cast<ObjCMethodDecl>(this))
1517 if (auto *ID = MD->getClassInterface())
1520 if (Ctx->isFunctionOrMethod()) {
1525 using ContextsTy = SmallVector<const DeclContext *, 8>;
1526 ContextsTy Contexts;
1528 // Collect named contexts.
1530 if (isa<NamedDecl>(Ctx))
1531 Contexts.push_back(Ctx);
1532 Ctx = Ctx->getParent();
1535 for (const DeclContext *DC : llvm::reverse(Contexts)) {
1536 if (const auto *Spec = dyn_cast<ClassTemplateSpecializationDecl>(DC)) {
1537 OS << Spec->getName();
1538 const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs();
1539 printTemplateArgumentList(OS, TemplateArgs.asArray(), P);
1540 } else if (const auto *ND = dyn_cast<NamespaceDecl>(DC)) {
1541 if (P.SuppressUnwrittenScope &&
1542 (ND->isAnonymousNamespace() || ND->isInline()))
1544 if (ND->isAnonymousNamespace()) {
1545 OS << (P.MSVCFormatting ? "`anonymous namespace\'"
1546 : "(anonymous namespace)");
1550 } else if (const auto *RD = dyn_cast<RecordDecl>(DC)) {
1551 if (!RD->getIdentifier())
1552 OS << "(anonymous " << RD->getKindName() << ')';
1555 } else if (const auto *FD = dyn_cast<FunctionDecl>(DC)) {
1556 const FunctionProtoType *FT = nullptr;
1557 if (FD->hasWrittenPrototype())
1558 FT = dyn_cast<FunctionProtoType>(FD->getType()->castAs<FunctionType>());
1562 unsigned NumParams = FD->getNumParams();
1563 for (unsigned i = 0; i < NumParams; ++i) {
1566 OS << FD->getParamDecl(i)->getType().stream(P);
1569 if (FT->isVariadic()) {
1576 } else if (const auto *ED = dyn_cast<EnumDecl>(DC)) {
1577 // C++ [dcl.enum]p10: Each enum-name and each unscoped
1578 // enumerator is declared in the scope that immediately contains
1579 // the enum-specifier. Each scoped enumerator is declared in the
1580 // scope of the enumeration.
1581 // For the case of unscoped enumerator, do not include in the qualified
1582 // name any information about its enum enclosing scope, as its visibility
1589 OS << *cast<NamedDecl>(DC);
1594 if (getDeclName() || isa<DecompositionDecl>(this))
1597 OS << "(anonymous)";
1600 void NamedDecl::getNameForDiagnostic(raw_ostream &OS,
1601 const PrintingPolicy &Policy,
1602 bool Qualified) const {
1604 printQualifiedName(OS, Policy);
1609 template<typename T> static bool isRedeclarableImpl(Redeclarable<T> *) {
1612 static bool isRedeclarableImpl(...) { return false; }
1613 static bool isRedeclarable(Decl::Kind K) {
1615 #define DECL(Type, Base) \
1617 return isRedeclarableImpl((Type##Decl *)nullptr);
1618 #define ABSTRACT_DECL(DECL)
1619 #include "clang/AST/DeclNodes.inc"
1621 llvm_unreachable("unknown decl kind");
1624 bool NamedDecl::declarationReplaces(NamedDecl *OldD, bool IsKnownNewer) const {
1625 assert(getDeclName() == OldD->getDeclName() && "Declaration name mismatch");
1627 // Never replace one imported declaration with another; we need both results
1628 // when re-exporting.
1629 if (OldD->isFromASTFile() && isFromASTFile())
1632 // A kind mismatch implies that the declaration is not replaced.
1633 if (OldD->getKind() != getKind())
1636 // For method declarations, we never replace. (Why?)
1637 if (isa<ObjCMethodDecl>(this))
1640 // For parameters, pick the newer one. This is either an error or (in
1641 // Objective-C) permitted as an extension.
1642 if (isa<ParmVarDecl>(this))
1645 // Inline namespaces can give us two declarations with the same
1646 // name and kind in the same scope but different contexts; we should
1647 // keep both declarations in this case.
1648 if (!this->getDeclContext()->getRedeclContext()->Equals(
1649 OldD->getDeclContext()->getRedeclContext()))
1652 // Using declarations can be replaced if they import the same name from the
1654 if (auto *UD = dyn_cast<UsingDecl>(this)) {
1655 ASTContext &Context = getASTContext();
1656 return Context.getCanonicalNestedNameSpecifier(UD->getQualifier()) ==
1657 Context.getCanonicalNestedNameSpecifier(
1658 cast<UsingDecl>(OldD)->getQualifier());
1660 if (auto *UUVD = dyn_cast<UnresolvedUsingValueDecl>(this)) {
1661 ASTContext &Context = getASTContext();
1662 return Context.getCanonicalNestedNameSpecifier(UUVD->getQualifier()) ==
1663 Context.getCanonicalNestedNameSpecifier(
1664 cast<UnresolvedUsingValueDecl>(OldD)->getQualifier());
1667 if (isRedeclarable(getKind())) {
1668 if (getCanonicalDecl() != OldD->getCanonicalDecl())
1674 // Check whether this is actually newer than OldD. We want to keep the
1675 // newer declaration. This loop will usually only iterate once, because
1676 // OldD is usually the previous declaration.
1677 for (auto D : redecls()) {
1681 // If we reach the canonical declaration, then OldD is not actually older
1684 // FIXME: In this case, we should not add this decl to the lookup table.
1685 if (D->isCanonicalDecl())
1689 // It's a newer declaration of the same kind of declaration in the same
1690 // scope: we want this decl instead of the existing one.
1694 // In all other cases, we need to keep both declarations in case they have
1695 // different visibility. Any attempt to use the name will result in an
1696 // ambiguity if more than one is visible.
1700 bool NamedDecl::hasLinkage() const {
1701 return getFormalLinkage() != NoLinkage;
1704 NamedDecl *NamedDecl::getUnderlyingDeclImpl() {
1705 NamedDecl *ND = this;
1706 while (auto *UD = dyn_cast<UsingShadowDecl>(ND))
1707 ND = UD->getTargetDecl();
1709 if (auto *AD = dyn_cast<ObjCCompatibleAliasDecl>(ND))
1710 return AD->getClassInterface();
1712 if (auto *AD = dyn_cast<NamespaceAliasDecl>(ND))
1713 return AD->getNamespace();
1718 bool NamedDecl::isCXXInstanceMember() const {
1719 if (!isCXXClassMember())
1722 const NamedDecl *D = this;
1723 if (isa<UsingShadowDecl>(D))
1724 D = cast<UsingShadowDecl>(D)->getTargetDecl();
1726 if (isa<FieldDecl>(D) || isa<IndirectFieldDecl>(D) || isa<MSPropertyDecl>(D))
1728 if (const auto *MD = dyn_cast_or_null<CXXMethodDecl>(D->getAsFunction()))
1729 return MD->isInstance();
1733 //===----------------------------------------------------------------------===//
1734 // DeclaratorDecl Implementation
1735 //===----------------------------------------------------------------------===//
1737 template <typename DeclT>
1738 static SourceLocation getTemplateOrInnerLocStart(const DeclT *decl) {
1739 if (decl->getNumTemplateParameterLists() > 0)
1740 return decl->getTemplateParameterList(0)->getTemplateLoc();
1742 return decl->getInnerLocStart();
1745 SourceLocation DeclaratorDecl::getTypeSpecStartLoc() const {
1746 TypeSourceInfo *TSI = getTypeSourceInfo();
1747 if (TSI) return TSI->getTypeLoc().getBeginLoc();
1748 return SourceLocation();
1751 void DeclaratorDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) {
1753 // Make sure the extended decl info is allocated.
1754 if (!hasExtInfo()) {
1755 // Save (non-extended) type source info pointer.
1756 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
1757 // Allocate external info struct.
1758 DeclInfo = new (getASTContext()) ExtInfo;
1759 // Restore savedTInfo into (extended) decl info.
1760 getExtInfo()->TInfo = savedTInfo;
1762 // Set qualifier info.
1763 getExtInfo()->QualifierLoc = QualifierLoc;
1765 // Here Qualifier == 0, i.e., we are removing the qualifier (if any).
1767 if (getExtInfo()->NumTemplParamLists == 0) {
1768 // Save type source info pointer.
1769 TypeSourceInfo *savedTInfo = getExtInfo()->TInfo;
1770 // Deallocate the extended decl info.
1771 getASTContext().Deallocate(getExtInfo());
1772 // Restore savedTInfo into (non-extended) decl info.
1773 DeclInfo = savedTInfo;
1776 getExtInfo()->QualifierLoc = QualifierLoc;
1781 void DeclaratorDecl::setTemplateParameterListsInfo(
1782 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
1783 assert(!TPLists.empty());
1784 // Make sure the extended decl info is allocated.
1785 if (!hasExtInfo()) {
1786 // Save (non-extended) type source info pointer.
1787 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
1788 // Allocate external info struct.
1789 DeclInfo = new (getASTContext()) ExtInfo;
1790 // Restore savedTInfo into (extended) decl info.
1791 getExtInfo()->TInfo = savedTInfo;
1793 // Set the template parameter lists info.
1794 getExtInfo()->setTemplateParameterListsInfo(Context, TPLists);
1797 SourceLocation DeclaratorDecl::getOuterLocStart() const {
1798 return getTemplateOrInnerLocStart(this);
1801 // Helper function: returns true if QT is or contains a type
1802 // having a postfix component.
1803 static bool typeIsPostfix(QualType QT) {
1805 const Type* T = QT.getTypePtr();
1806 switch (T->getTypeClass()) {
1810 QT = cast<PointerType>(T)->getPointeeType();
1812 case Type::BlockPointer:
1813 QT = cast<BlockPointerType>(T)->getPointeeType();
1815 case Type::MemberPointer:
1816 QT = cast<MemberPointerType>(T)->getPointeeType();
1818 case Type::LValueReference:
1819 case Type::RValueReference:
1820 QT = cast<ReferenceType>(T)->getPointeeType();
1822 case Type::PackExpansion:
1823 QT = cast<PackExpansionType>(T)->getPattern();
1826 case Type::ConstantArray:
1827 case Type::DependentSizedArray:
1828 case Type::IncompleteArray:
1829 case Type::VariableArray:
1830 case Type::FunctionProto:
1831 case Type::FunctionNoProto:
1837 SourceRange DeclaratorDecl::getSourceRange() const {
1838 SourceLocation RangeEnd = getLocation();
1839 if (TypeSourceInfo *TInfo = getTypeSourceInfo()) {
1840 // If the declaration has no name or the type extends past the name take the
1841 // end location of the type.
1842 if (!getDeclName() || typeIsPostfix(TInfo->getType()))
1843 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
1845 return SourceRange(getOuterLocStart(), RangeEnd);
1848 void QualifierInfo::setTemplateParameterListsInfo(
1849 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
1850 // Free previous template parameters (if any).
1851 if (NumTemplParamLists > 0) {
1852 Context.Deallocate(TemplParamLists);
1853 TemplParamLists = nullptr;
1854 NumTemplParamLists = 0;
1856 // Set info on matched template parameter lists (if any).
1857 if (!TPLists.empty()) {
1858 TemplParamLists = new (Context) TemplateParameterList *[TPLists.size()];
1859 NumTemplParamLists = TPLists.size();
1860 std::copy(TPLists.begin(), TPLists.end(), TemplParamLists);
1864 //===----------------------------------------------------------------------===//
1865 // VarDecl Implementation
1866 //===----------------------------------------------------------------------===//
1868 const char *VarDecl::getStorageClassSpecifierString(StorageClass SC) {
1870 case SC_None: break;
1871 case SC_Auto: return "auto";
1872 case SC_Extern: return "extern";
1873 case SC_PrivateExtern: return "__private_extern__";
1874 case SC_Register: return "register";
1875 case SC_Static: return "static";
1878 llvm_unreachable("Invalid storage class");
1881 VarDecl::VarDecl(Kind DK, ASTContext &C, DeclContext *DC,
1882 SourceLocation StartLoc, SourceLocation IdLoc,
1883 IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo,
1885 : DeclaratorDecl(DK, DC, IdLoc, Id, T, TInfo, StartLoc),
1886 redeclarable_base(C) {
1887 static_assert(sizeof(VarDeclBitfields) <= sizeof(unsigned),
1888 "VarDeclBitfields too large!");
1889 static_assert(sizeof(ParmVarDeclBitfields) <= sizeof(unsigned),
1890 "ParmVarDeclBitfields too large!");
1891 static_assert(sizeof(NonParmVarDeclBitfields) <= sizeof(unsigned),
1892 "NonParmVarDeclBitfields too large!");
1894 VarDeclBits.SClass = SC;
1895 // Everything else is implicitly initialized to false.
1898 VarDecl *VarDecl::Create(ASTContext &C, DeclContext *DC,
1899 SourceLocation StartL, SourceLocation IdL,
1900 IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo,
1902 return new (C, DC) VarDecl(Var, C, DC, StartL, IdL, Id, T, TInfo, S);
1905 VarDecl *VarDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
1907 VarDecl(Var, C, nullptr, SourceLocation(), SourceLocation(), nullptr,
1908 QualType(), nullptr, SC_None);
1911 void VarDecl::setStorageClass(StorageClass SC) {
1912 assert(isLegalForVariable(SC));
1913 VarDeclBits.SClass = SC;
1916 VarDecl::TLSKind VarDecl::getTLSKind() const {
1917 switch (VarDeclBits.TSCSpec) {
1918 case TSCS_unspecified:
1919 if (!hasAttr<ThreadAttr>() &&
1920 !(getASTContext().getLangOpts().OpenMPUseTLS &&
1921 getASTContext().getTargetInfo().isTLSSupported() &&
1922 hasAttr<OMPThreadPrivateDeclAttr>()))
1924 return ((getASTContext().getLangOpts().isCompatibleWithMSVC(
1925 LangOptions::MSVC2015)) ||
1926 hasAttr<OMPThreadPrivateDeclAttr>())
1929 case TSCS___thread: // Fall through.
1930 case TSCS__Thread_local:
1932 case TSCS_thread_local:
1935 llvm_unreachable("Unknown thread storage class specifier!");
1938 SourceRange VarDecl::getSourceRange() const {
1939 if (const Expr *Init = getInit()) {
1940 SourceLocation InitEnd = Init->getLocEnd();
1941 // If Init is implicit, ignore its source range and fallback on
1942 // DeclaratorDecl::getSourceRange() to handle postfix elements.
1943 if (InitEnd.isValid() && InitEnd != getLocation())
1944 return SourceRange(getOuterLocStart(), InitEnd);
1946 return DeclaratorDecl::getSourceRange();
1949 template<typename T>
1950 static LanguageLinkage getDeclLanguageLinkage(const T &D) {
1951 // C++ [dcl.link]p1: All function types, function names with external linkage,
1952 // and variable names with external linkage have a language linkage.
1953 if (!D.hasExternalFormalLinkage())
1954 return NoLanguageLinkage;
1956 // Language linkage is a C++ concept, but saying that everything else in C has
1957 // C language linkage fits the implementation nicely.
1958 ASTContext &Context = D.getASTContext();
1959 if (!Context.getLangOpts().CPlusPlus)
1960 return CLanguageLinkage;
1962 // C++ [dcl.link]p4: A C language linkage is ignored in determining the
1963 // language linkage of the names of class members and the function type of
1964 // class member functions.
1965 const DeclContext *DC = D.getDeclContext();
1967 return CXXLanguageLinkage;
1969 // If the first decl is in an extern "C" context, any other redeclaration
1970 // will have C language linkage. If the first one is not in an extern "C"
1971 // context, we would have reported an error for any other decl being in one.
1972 if (isFirstInExternCContext(&D))
1973 return CLanguageLinkage;
1974 return CXXLanguageLinkage;
1977 template<typename T>
1978 static bool isDeclExternC(const T &D) {
1979 // Since the context is ignored for class members, they can only have C++
1980 // language linkage or no language linkage.
1981 const DeclContext *DC = D.getDeclContext();
1982 if (DC->isRecord()) {
1983 assert(D.getASTContext().getLangOpts().CPlusPlus);
1987 return D.getLanguageLinkage() == CLanguageLinkage;
1990 LanguageLinkage VarDecl::getLanguageLinkage() const {
1991 return getDeclLanguageLinkage(*this);
1994 bool VarDecl::isExternC() const {
1995 return isDeclExternC(*this);
1998 bool VarDecl::isInExternCContext() const {
1999 return getLexicalDeclContext()->isExternCContext();
2002 bool VarDecl::isInExternCXXContext() const {
2003 return getLexicalDeclContext()->isExternCXXContext();
2006 VarDecl *VarDecl::getCanonicalDecl() { return getFirstDecl(); }
2008 VarDecl::DefinitionKind
2009 VarDecl::isThisDeclarationADefinition(ASTContext &C) const {
2010 if (isThisDeclarationADemotedDefinition())
2011 return DeclarationOnly;
2013 // C++ [basic.def]p2:
2014 // A declaration is a definition unless [...] it contains the 'extern'
2015 // specifier or a linkage-specification and neither an initializer [...],
2016 // it declares a non-inline static data member in a class declaration [...],
2017 // it declares a static data member outside a class definition and the variable
2018 // was defined within the class with the constexpr specifier [...],
2019 // C++1y [temp.expl.spec]p15:
2020 // An explicit specialization of a static data member or an explicit
2021 // specialization of a static data member template is a definition if the
2022 // declaration includes an initializer; otherwise, it is a declaration.
2024 // FIXME: How do you declare (but not define) a partial specialization of
2025 // a static data member template outside the containing class?
2026 if (isStaticDataMember()) {
2027 if (isOutOfLine() &&
2028 !(getCanonicalDecl()->isInline() &&
2029 getCanonicalDecl()->isConstexpr()) &&
2031 // If the first declaration is out-of-line, this may be an
2032 // instantiation of an out-of-line partial specialization of a variable
2033 // template for which we have not yet instantiated the initializer.
2034 (getFirstDecl()->isOutOfLine()
2035 ? getTemplateSpecializationKind() == TSK_Undeclared
2036 : getTemplateSpecializationKind() !=
2037 TSK_ExplicitSpecialization) ||
2038 isa<VarTemplatePartialSpecializationDecl>(this)))
2040 else if (!isOutOfLine() && isInline())
2043 return DeclarationOnly;
2046 // A definition of an identifier is a declaration for that identifier that
2047 // [...] causes storage to be reserved for that object.
2048 // Note: that applies for all non-file-scope objects.
2050 // If the declaration of an identifier for an object has file scope and an
2051 // initializer, the declaration is an external definition for the identifier
2055 if (hasDefiningAttr())
2058 if (const auto *SAA = getAttr<SelectAnyAttr>())
2059 if (!SAA->isInherited())
2062 // A variable template specialization (other than a static data member
2063 // template or an explicit specialization) is a declaration until we
2064 // instantiate its initializer.
2065 if (auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(this)) {
2066 if (VTSD->getTemplateSpecializationKind() != TSK_ExplicitSpecialization &&
2067 !isa<VarTemplatePartialSpecializationDecl>(VTSD) &&
2068 !VTSD->IsCompleteDefinition)
2069 return DeclarationOnly;
2072 if (hasExternalStorage())
2073 return DeclarationOnly;
2076 // A declaration directly contained in a linkage-specification is treated
2077 // as if it contains the extern specifier for the purpose of determining
2078 // the linkage of the declared name and whether it is a definition.
2079 if (isSingleLineLanguageLinkage(*this))
2080 return DeclarationOnly;
2083 // A declaration of an object that has file scope without an initializer,
2084 // and without a storage class specifier or the scs 'static', constitutes
2085 // a tentative definition.
2086 // No such thing in C++.
2087 if (!C.getLangOpts().CPlusPlus && isFileVarDecl())
2088 return TentativeDefinition;
2090 // What's left is (in C, block-scope) declarations without initializers or
2091 // external storage. These are definitions.
2095 VarDecl *VarDecl::getActingDefinition() {
2096 DefinitionKind Kind = isThisDeclarationADefinition();
2097 if (Kind != TentativeDefinition)
2100 VarDecl *LastTentative = nullptr;
2101 VarDecl *First = getFirstDecl();
2102 for (auto I : First->redecls()) {
2103 Kind = I->isThisDeclarationADefinition();
2104 if (Kind == Definition)
2106 else if (Kind == TentativeDefinition)
2109 return LastTentative;
2112 VarDecl *VarDecl::getDefinition(ASTContext &C) {
2113 VarDecl *First = getFirstDecl();
2114 for (auto I : First->redecls()) {
2115 if (I->isThisDeclarationADefinition(C) == Definition)
2121 VarDecl::DefinitionKind VarDecl::hasDefinition(ASTContext &C) const {
2122 DefinitionKind Kind = DeclarationOnly;
2124 const VarDecl *First = getFirstDecl();
2125 for (auto I : First->redecls()) {
2126 Kind = std::max(Kind, I->isThisDeclarationADefinition(C));
2127 if (Kind == Definition)
2134 const Expr *VarDecl::getAnyInitializer(const VarDecl *&D) const {
2135 for (auto I : redecls()) {
2136 if (auto Expr = I->getInit()) {
2144 bool VarDecl::hasInit() const {
2145 if (auto *P = dyn_cast<ParmVarDecl>(this))
2146 if (P->hasUnparsedDefaultArg() || P->hasUninstantiatedDefaultArg())
2149 return !Init.isNull();
2152 Expr *VarDecl::getInit() {
2156 if (auto *S = Init.dyn_cast<Stmt *>())
2157 return cast<Expr>(S);
2159 return cast_or_null<Expr>(Init.get<EvaluatedStmt *>()->Value);
2162 Stmt **VarDecl::getInitAddress() {
2163 if (auto *ES = Init.dyn_cast<EvaluatedStmt *>())
2166 return Init.getAddrOfPtr1();
2169 bool VarDecl::isOutOfLine() const {
2170 if (Decl::isOutOfLine())
2173 if (!isStaticDataMember())
2176 // If this static data member was instantiated from a static data member of
2177 // a class template, check whether that static data member was defined
2179 if (VarDecl *VD = getInstantiatedFromStaticDataMember())
2180 return VD->isOutOfLine();
2185 void VarDecl::setInit(Expr *I) {
2186 if (auto *Eval = Init.dyn_cast<EvaluatedStmt *>()) {
2187 Eval->~EvaluatedStmt();
2188 getASTContext().Deallocate(Eval);
2194 bool VarDecl::isUsableInConstantExpressions(ASTContext &C) const {
2195 const LangOptions &Lang = C.getLangOpts();
2197 if (!Lang.CPlusPlus)
2200 // In C++11, any variable of reference type can be used in a constant
2201 // expression if it is initialized by a constant expression.
2202 if (Lang.CPlusPlus11 && getType()->isReferenceType())
2205 // Only const objects can be used in constant expressions in C++. C++98 does
2206 // not require the variable to be non-volatile, but we consider this to be a
2208 if (!getType().isConstQualified() || getType().isVolatileQualified())
2211 // In C++, const, non-volatile variables of integral or enumeration types
2212 // can be used in constant expressions.
2213 if (getType()->isIntegralOrEnumerationType())
2216 // Additionally, in C++11, non-volatile constexpr variables can be used in
2217 // constant expressions.
2218 return Lang.CPlusPlus11 && isConstexpr();
2221 /// Convert the initializer for this declaration to the elaborated EvaluatedStmt
2222 /// form, which contains extra information on the evaluated value of the
2224 EvaluatedStmt *VarDecl::ensureEvaluatedStmt() const {
2225 auto *Eval = Init.dyn_cast<EvaluatedStmt *>();
2227 // Note: EvaluatedStmt contains an APValue, which usually holds
2228 // resources not allocated from the ASTContext. We need to do some
2229 // work to avoid leaking those, but we do so in VarDecl::evaluateValue
2230 // where we can detect whether there's anything to clean up or not.
2231 Eval = new (getASTContext()) EvaluatedStmt;
2232 Eval->Value = Init.get<Stmt *>();
2238 APValue *VarDecl::evaluateValue() const {
2239 SmallVector<PartialDiagnosticAt, 8> Notes;
2240 return evaluateValue(Notes);
2243 APValue *VarDecl::evaluateValue(
2244 SmallVectorImpl<PartialDiagnosticAt> &Notes) const {
2245 EvaluatedStmt *Eval = ensureEvaluatedStmt();
2247 // We only produce notes indicating why an initializer is non-constant the
2248 // first time it is evaluated. FIXME: The notes won't always be emitted the
2249 // first time we try evaluation, so might not be produced at all.
2250 if (Eval->WasEvaluated)
2251 return Eval->Evaluated.isUninit() ? nullptr : &Eval->Evaluated;
2253 const auto *Init = cast<Expr>(Eval->Value);
2254 assert(!Init->isValueDependent());
2256 if (Eval->IsEvaluating) {
2257 // FIXME: Produce a diagnostic for self-initialization.
2258 Eval->CheckedICE = true;
2259 Eval->IsICE = false;
2263 Eval->IsEvaluating = true;
2265 bool Result = Init->EvaluateAsInitializer(Eval->Evaluated, getASTContext(),
2268 // Ensure the computed APValue is cleaned up later if evaluation succeeded,
2269 // or that it's empty (so that there's nothing to clean up) if evaluation
2272 Eval->Evaluated = APValue();
2273 else if (Eval->Evaluated.needsCleanup())
2274 getASTContext().addDestruction(&Eval->Evaluated);
2276 Eval->IsEvaluating = false;
2277 Eval->WasEvaluated = true;
2279 // In C++11, we have determined whether the initializer was a constant
2280 // expression as a side-effect.
2281 if (getASTContext().getLangOpts().CPlusPlus11 && !Eval->CheckedICE) {
2282 Eval->CheckedICE = true;
2283 Eval->IsICE = Result && Notes.empty();
2286 return Result ? &Eval->Evaluated : nullptr;
2289 APValue *VarDecl::getEvaluatedValue() const {
2290 if (EvaluatedStmt *Eval = Init.dyn_cast<EvaluatedStmt *>())
2291 if (Eval->WasEvaluated)
2292 return &Eval->Evaluated;
2297 bool VarDecl::isInitKnownICE() const {
2298 if (EvaluatedStmt *Eval = Init.dyn_cast<EvaluatedStmt *>())
2299 return Eval->CheckedICE;
2304 bool VarDecl::isInitICE() const {
2305 assert(isInitKnownICE() &&
2306 "Check whether we already know that the initializer is an ICE");
2307 return Init.get<EvaluatedStmt *>()->IsICE;
2310 bool VarDecl::checkInitIsICE() const {
2311 // Initializers of weak variables are never ICEs.
2315 EvaluatedStmt *Eval = ensureEvaluatedStmt();
2316 if (Eval->CheckedICE)
2317 // We have already checked whether this subexpression is an
2318 // integral constant expression.
2321 const auto *Init = cast<Expr>(Eval->Value);
2322 assert(!Init->isValueDependent());
2324 // In C++11, evaluate the initializer to check whether it's a constant
2326 if (getASTContext().getLangOpts().CPlusPlus11) {
2327 SmallVector<PartialDiagnosticAt, 8> Notes;
2328 evaluateValue(Notes);
2332 // It's an ICE whether or not the definition we found is
2333 // out-of-line. See DR 721 and the discussion in Clang PR
2334 // 6206 for details.
2336 if (Eval->CheckingICE)
2338 Eval->CheckingICE = true;
2340 Eval->IsICE = Init->isIntegerConstantExpr(getASTContext());
2341 Eval->CheckingICE = false;
2342 Eval->CheckedICE = true;
2346 template<typename DeclT>
2347 static DeclT *getDefinitionOrSelf(DeclT *D) {
2349 if (auto *Def = D->getDefinition())
2354 VarDecl *VarDecl::getTemplateInstantiationPattern() const {
2355 // If it's a variable template specialization, find the template or partial
2356 // specialization from which it was instantiated.
2357 if (auto *VDTemplSpec = dyn_cast<VarTemplateSpecializationDecl>(this)) {
2358 auto From = VDTemplSpec->getInstantiatedFrom();
2359 if (auto *VTD = From.dyn_cast<VarTemplateDecl *>()) {
2360 while (auto *NewVTD = VTD->getInstantiatedFromMemberTemplate()) {
2361 if (NewVTD->isMemberSpecialization())
2365 return getDefinitionOrSelf(VTD->getTemplatedDecl());
2368 From.dyn_cast<VarTemplatePartialSpecializationDecl *>()) {
2369 while (auto *NewVTPSD = VTPSD->getInstantiatedFromMember()) {
2370 if (NewVTPSD->isMemberSpecialization())
2374 return getDefinitionOrSelf<VarDecl>(VTPSD);
2378 if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo()) {
2379 if (isTemplateInstantiation(MSInfo->getTemplateSpecializationKind())) {
2380 VarDecl *VD = getInstantiatedFromStaticDataMember();
2381 while (auto *NewVD = VD->getInstantiatedFromStaticDataMember())
2383 return getDefinitionOrSelf(VD);
2387 if (VarTemplateDecl *VarTemplate = getDescribedVarTemplate()) {
2388 while (VarTemplate->getInstantiatedFromMemberTemplate()) {
2389 if (VarTemplate->isMemberSpecialization())
2391 VarTemplate = VarTemplate->getInstantiatedFromMemberTemplate();
2394 return getDefinitionOrSelf(VarTemplate->getTemplatedDecl());
2399 VarDecl *VarDecl::getInstantiatedFromStaticDataMember() const {
2400 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2401 return cast<VarDecl>(MSI->getInstantiatedFrom());
2406 TemplateSpecializationKind VarDecl::getTemplateSpecializationKind() const {
2407 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
2408 return Spec->getSpecializationKind();
2410 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2411 return MSI->getTemplateSpecializationKind();
2413 return TSK_Undeclared;
2416 SourceLocation VarDecl::getPointOfInstantiation() const {
2417 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
2418 return Spec->getPointOfInstantiation();
2420 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2421 return MSI->getPointOfInstantiation();
2423 return SourceLocation();
2426 VarTemplateDecl *VarDecl::getDescribedVarTemplate() const {
2427 return getASTContext().getTemplateOrSpecializationInfo(this)
2428 .dyn_cast<VarTemplateDecl *>();
2431 void VarDecl::setDescribedVarTemplate(VarTemplateDecl *Template) {
2432 getASTContext().setTemplateOrSpecializationInfo(this, Template);
2435 bool VarDecl::isKnownToBeDefined() const {
2436 const auto &LangOpts = getASTContext().getLangOpts();
2437 // In CUDA mode without relocatable device code, variables of form 'extern
2438 // __shared__ Foo foo[]' are pointers to the base of the GPU core's shared
2439 // memory pool. These are never undefined variables, even if they appear
2440 // inside of an anon namespace or static function.
2442 // With CUDA relocatable device code enabled, these variables don't get
2443 // special handling; they're treated like regular extern variables.
2444 if (LangOpts.CUDA && !LangOpts.CUDARelocatableDeviceCode &&
2445 hasExternalStorage() && hasAttr<CUDASharedAttr>() &&
2446 isa<IncompleteArrayType>(getType()))
2449 return hasDefinition();
2452 MemberSpecializationInfo *VarDecl::getMemberSpecializationInfo() const {
2453 if (isStaticDataMember())
2455 // return getASTContext().getInstantiatedFromStaticDataMember(this);
2456 return getASTContext().getTemplateOrSpecializationInfo(this)
2457 .dyn_cast<MemberSpecializationInfo *>();
2461 void VarDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
2462 SourceLocation PointOfInstantiation) {
2463 assert((isa<VarTemplateSpecializationDecl>(this) ||
2464 getMemberSpecializationInfo()) &&
2465 "not a variable or static data member template specialization");
2467 if (VarTemplateSpecializationDecl *Spec =
2468 dyn_cast<VarTemplateSpecializationDecl>(this)) {
2469 Spec->setSpecializationKind(TSK);
2470 if (TSK != TSK_ExplicitSpecialization && PointOfInstantiation.isValid() &&
2471 Spec->getPointOfInstantiation().isInvalid()) {
2472 Spec->setPointOfInstantiation(PointOfInstantiation);
2473 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
2474 L->InstantiationRequested(this);
2478 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo()) {
2479 MSI->setTemplateSpecializationKind(TSK);
2480 if (TSK != TSK_ExplicitSpecialization && PointOfInstantiation.isValid() &&
2481 MSI->getPointOfInstantiation().isInvalid()) {
2482 MSI->setPointOfInstantiation(PointOfInstantiation);
2483 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
2484 L->InstantiationRequested(this);
2490 VarDecl::setInstantiationOfStaticDataMember(VarDecl *VD,
2491 TemplateSpecializationKind TSK) {
2492 assert(getASTContext().getTemplateOrSpecializationInfo(this).isNull() &&
2493 "Previous template or instantiation?");
2494 getASTContext().setInstantiatedFromStaticDataMember(this, VD, TSK);
2497 //===----------------------------------------------------------------------===//
2498 // ParmVarDecl Implementation
2499 //===----------------------------------------------------------------------===//
2501 ParmVarDecl *ParmVarDecl::Create(ASTContext &C, DeclContext *DC,
2502 SourceLocation StartLoc,
2503 SourceLocation IdLoc, IdentifierInfo *Id,
2504 QualType T, TypeSourceInfo *TInfo,
2505 StorageClass S, Expr *DefArg) {
2506 return new (C, DC) ParmVarDecl(ParmVar, C, DC, StartLoc, IdLoc, Id, T, TInfo,
2510 QualType ParmVarDecl::getOriginalType() const {
2511 TypeSourceInfo *TSI = getTypeSourceInfo();
2512 QualType T = TSI ? TSI->getType() : getType();
2513 if (const auto *DT = dyn_cast<DecayedType>(T))
2514 return DT->getOriginalType();
2518 ParmVarDecl *ParmVarDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
2520 ParmVarDecl(ParmVar, C, nullptr, SourceLocation(), SourceLocation(),
2521 nullptr, QualType(), nullptr, SC_None, nullptr);
2524 SourceRange ParmVarDecl::getSourceRange() const {
2525 if (!hasInheritedDefaultArg()) {
2526 SourceRange ArgRange = getDefaultArgRange();
2527 if (ArgRange.isValid())
2528 return SourceRange(getOuterLocStart(), ArgRange.getEnd());
2531 // DeclaratorDecl considers the range of postfix types as overlapping with the
2532 // declaration name, but this is not the case with parameters in ObjC methods.
2533 if (isa<ObjCMethodDecl>(getDeclContext()))
2534 return SourceRange(DeclaratorDecl::getLocStart(), getLocation());
2536 return DeclaratorDecl::getSourceRange();
2539 Expr *ParmVarDecl::getDefaultArg() {
2540 assert(!hasUnparsedDefaultArg() && "Default argument is not yet parsed!");
2541 assert(!hasUninstantiatedDefaultArg() &&
2542 "Default argument is not yet instantiated!");
2544 Expr *Arg = getInit();
2545 if (auto *E = dyn_cast_or_null<ExprWithCleanups>(Arg))
2546 return E->getSubExpr();
2551 void ParmVarDecl::setDefaultArg(Expr *defarg) {
2552 ParmVarDeclBits.DefaultArgKind = DAK_Normal;
2556 SourceRange ParmVarDecl::getDefaultArgRange() const {
2557 switch (ParmVarDeclBits.DefaultArgKind) {
2560 // Nothing we can do here.
2561 return SourceRange();
2563 case DAK_Uninstantiated:
2564 return getUninstantiatedDefaultArg()->getSourceRange();
2567 if (const Expr *E = getInit())
2568 return E->getSourceRange();
2570 // Missing an actual expression, may be invalid.
2571 return SourceRange();
2573 llvm_unreachable("Invalid default argument kind.");
2576 void ParmVarDecl::setUninstantiatedDefaultArg(Expr *arg) {
2577 ParmVarDeclBits.DefaultArgKind = DAK_Uninstantiated;
2581 Expr *ParmVarDecl::getUninstantiatedDefaultArg() {
2582 assert(hasUninstantiatedDefaultArg() &&
2583 "Wrong kind of initialization expression!");
2584 return cast_or_null<Expr>(Init.get<Stmt *>());
2587 bool ParmVarDecl::hasDefaultArg() const {
2588 // FIXME: We should just return false for DAK_None here once callers are
2589 // prepared for the case that we encountered an invalid default argument and
2590 // were unable to even build an invalid expression.
2591 return hasUnparsedDefaultArg() || hasUninstantiatedDefaultArg() ||
2595 bool ParmVarDecl::isParameterPack() const {
2596 return isa<PackExpansionType>(getType());
2599 void ParmVarDecl::setParameterIndexLarge(unsigned parameterIndex) {
2600 getASTContext().setParameterIndex(this, parameterIndex);
2601 ParmVarDeclBits.ParameterIndex = ParameterIndexSentinel;
2604 unsigned ParmVarDecl::getParameterIndexLarge() const {
2605 return getASTContext().getParameterIndex(this);
2608 //===----------------------------------------------------------------------===//
2609 // FunctionDecl Implementation
2610 //===----------------------------------------------------------------------===//
2612 void FunctionDecl::getNameForDiagnostic(
2613 raw_ostream &OS, const PrintingPolicy &Policy, bool Qualified) const {
2614 NamedDecl::getNameForDiagnostic(OS, Policy, Qualified);
2615 const TemplateArgumentList *TemplateArgs = getTemplateSpecializationArgs();
2617 printTemplateArgumentList(OS, TemplateArgs->asArray(), Policy);
2620 bool FunctionDecl::isVariadic() const {
2621 if (const auto *FT = getType()->getAs<FunctionProtoType>())
2622 return FT->isVariadic();
2626 bool FunctionDecl::hasBody(const FunctionDecl *&Definition) const {
2627 for (auto I : redecls()) {
2628 if (I->doesThisDeclarationHaveABody()) {
2637 bool FunctionDecl::hasTrivialBody() const
2639 Stmt *S = getBody();
2641 // Since we don't have a body for this function, we don't know if it's
2646 if (isa<CompoundStmt>(S) && cast<CompoundStmt>(S)->body_empty())
2651 bool FunctionDecl::isDefined(const FunctionDecl *&Definition) const {
2652 for (auto I : redecls()) {
2653 if (I->isThisDeclarationADefinition()) {
2662 Stmt *FunctionDecl::getBody(const FunctionDecl *&Definition) const {
2663 if (!hasBody(Definition))
2666 if (Definition->Body)
2667 return Definition->Body.get(getASTContext().getExternalSource());
2672 void FunctionDecl::setBody(Stmt *B) {
2675 EndRangeLoc = B->getLocEnd();
2678 void FunctionDecl::setPure(bool P) {
2681 if (auto *Parent = dyn_cast<CXXRecordDecl>(getDeclContext()))
2682 Parent->markedVirtualFunctionPure();
2685 template<std::size_t Len>
2686 static bool isNamed(const NamedDecl *ND, const char (&Str)[Len]) {
2687 IdentifierInfo *II = ND->getIdentifier();
2688 return II && II->isStr(Str);
2691 bool FunctionDecl::isMain() const {
2692 const TranslationUnitDecl *tunit =
2693 dyn_cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext());
2695 !tunit->getASTContext().getLangOpts().Freestanding &&
2696 isNamed(this, "main");
2699 bool FunctionDecl::isMSVCRTEntryPoint() const {
2700 const TranslationUnitDecl *TUnit =
2701 dyn_cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext());
2705 // Even though we aren't really targeting MSVCRT if we are freestanding,
2706 // semantic analysis for these functions remains the same.
2708 // MSVCRT entry points only exist on MSVCRT targets.
2709 if (!TUnit->getASTContext().getTargetInfo().getTriple().isOSMSVCRT())
2712 // Nameless functions like constructors cannot be entry points.
2713 if (!getIdentifier())
2716 return llvm::StringSwitch<bool>(getName())
2717 .Cases("main", // an ANSI console app
2718 "wmain", // a Unicode console App
2719 "WinMain", // an ANSI GUI app
2720 "wWinMain", // a Unicode GUI app
2726 bool FunctionDecl::isReservedGlobalPlacementOperator() const {
2727 assert(getDeclName().getNameKind() == DeclarationName::CXXOperatorName);
2728 assert(getDeclName().getCXXOverloadedOperator() == OO_New ||
2729 getDeclName().getCXXOverloadedOperator() == OO_Delete ||
2730 getDeclName().getCXXOverloadedOperator() == OO_Array_New ||
2731 getDeclName().getCXXOverloadedOperator() == OO_Array_Delete);
2733 if (!getDeclContext()->getRedeclContext()->isTranslationUnit())
2736 const auto *proto = getType()->castAs<FunctionProtoType>();
2737 if (proto->getNumParams() != 2 || proto->isVariadic())
2740 ASTContext &Context =
2741 cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext())
2744 // The result type and first argument type are constant across all
2745 // these operators. The second argument must be exactly void*.
2746 return (proto->getParamType(1).getCanonicalType() == Context.VoidPtrTy);
2749 bool FunctionDecl::isReplaceableGlobalAllocationFunction(bool *IsAligned) const {
2750 if (getDeclName().getNameKind() != DeclarationName::CXXOperatorName)
2752 if (getDeclName().getCXXOverloadedOperator() != OO_New &&
2753 getDeclName().getCXXOverloadedOperator() != OO_Delete &&
2754 getDeclName().getCXXOverloadedOperator() != OO_Array_New &&
2755 getDeclName().getCXXOverloadedOperator() != OO_Array_Delete)
2758 if (isa<CXXRecordDecl>(getDeclContext()))
2761 // This can only fail for an invalid 'operator new' declaration.
2762 if (!getDeclContext()->getRedeclContext()->isTranslationUnit())
2765 const auto *FPT = getType()->castAs<FunctionProtoType>();
2766 if (FPT->getNumParams() == 0 || FPT->getNumParams() > 3 || FPT->isVariadic())
2769 // If this is a single-parameter function, it must be a replaceable global
2770 // allocation or deallocation function.
2771 if (FPT->getNumParams() == 1)
2774 unsigned Params = 1;
2775 QualType Ty = FPT->getParamType(Params);
2776 ASTContext &Ctx = getASTContext();
2778 auto Consume = [&] {
2780 Ty = Params < FPT->getNumParams() ? FPT->getParamType(Params) : QualType();
2783 // In C++14, the next parameter can be a 'std::size_t' for sized delete.
2784 bool IsSizedDelete = false;
2785 if (Ctx.getLangOpts().SizedDeallocation &&
2786 (getDeclName().getCXXOverloadedOperator() == OO_Delete ||
2787 getDeclName().getCXXOverloadedOperator() == OO_Array_Delete) &&
2788 Ctx.hasSameType(Ty, Ctx.getSizeType())) {
2789 IsSizedDelete = true;
2793 // In C++17, the next parameter can be a 'std::align_val_t' for aligned
2795 if (Ctx.getLangOpts().AlignedAllocation && !Ty.isNull() && Ty->isAlignValT()) {
2801 // Finally, if this is not a sized delete, the final parameter can
2802 // be a 'const std::nothrow_t&'.
2803 if (!IsSizedDelete && !Ty.isNull() && Ty->isReferenceType()) {
2804 Ty = Ty->getPointeeType();
2805 if (Ty.getCVRQualifiers() != Qualifiers::Const)
2807 const CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
2808 if (RD && isNamed(RD, "nothrow_t") && RD->isInStdNamespace())
2812 return Params == FPT->getNumParams();
2815 bool FunctionDecl::isDestroyingOperatorDelete() const {
2817 // Within a class C, a single object deallocation function with signature
2818 // (T, std::destroying_delete_t, <more params>)
2819 // is a destroying operator delete.
2820 if (!isa<CXXMethodDecl>(this) || getOverloadedOperator() != OO_Delete ||
2824 auto *RD = getParamDecl(1)->getType()->getAsCXXRecordDecl();
2825 return RD && RD->isInStdNamespace() && RD->getIdentifier() &&
2826 RD->getIdentifier()->isStr("destroying_delete_t");
2829 LanguageLinkage FunctionDecl::getLanguageLinkage() const {
2830 return getDeclLanguageLinkage(*this);
2833 bool FunctionDecl::isExternC() const {
2834 return isDeclExternC(*this);
2837 bool FunctionDecl::isInExternCContext() const {
2838 return getLexicalDeclContext()->isExternCContext();
2841 bool FunctionDecl::isInExternCXXContext() const {
2842 return getLexicalDeclContext()->isExternCXXContext();
2845 bool FunctionDecl::isGlobal() const {
2846 if (const auto *Method = dyn_cast<CXXMethodDecl>(this))
2847 return Method->isStatic();
2849 if (getCanonicalDecl()->getStorageClass() == SC_Static)
2852 for (const DeclContext *DC = getDeclContext();
2854 DC = DC->getParent()) {
2855 if (const auto *Namespace = cast<NamespaceDecl>(DC)) {
2856 if (!Namespace->getDeclName())
2865 bool FunctionDecl::isNoReturn() const {
2866 if (hasAttr<NoReturnAttr>() || hasAttr<CXX11NoReturnAttr>() ||
2867 hasAttr<C11NoReturnAttr>())
2870 if (auto *FnTy = getType()->getAs<FunctionType>())
2871 return FnTy->getNoReturnAttr();
2876 bool FunctionDecl::isCPUDispatchMultiVersion() const {
2877 return isMultiVersion() && hasAttr<CPUDispatchAttr>();
2880 bool FunctionDecl::isCPUSpecificMultiVersion() const {
2881 return isMultiVersion() && hasAttr<CPUSpecificAttr>();
2885 FunctionDecl::setPreviousDeclaration(FunctionDecl *PrevDecl) {
2886 redeclarable_base::setPreviousDecl(PrevDecl);
2888 if (FunctionTemplateDecl *FunTmpl = getDescribedFunctionTemplate()) {
2889 FunctionTemplateDecl *PrevFunTmpl
2890 = PrevDecl? PrevDecl->getDescribedFunctionTemplate() : nullptr;
2891 assert((!PrevDecl || PrevFunTmpl) && "Function/function template mismatch");
2892 FunTmpl->setPreviousDecl(PrevFunTmpl);
2895 if (PrevDecl && PrevDecl->IsInline)
2899 FunctionDecl *FunctionDecl::getCanonicalDecl() { return getFirstDecl(); }
2901 /// Returns a value indicating whether this function
2902 /// corresponds to a builtin function.
2904 /// The function corresponds to a built-in function if it is
2905 /// declared at translation scope or within an extern "C" block and
2906 /// its name matches with the name of a builtin. The returned value
2907 /// will be 0 for functions that do not correspond to a builtin, a
2908 /// value of type \c Builtin::ID if in the target-independent range
2909 /// \c [1,Builtin::First), or a target-specific builtin value.
2910 unsigned FunctionDecl::getBuiltinID() const {
2911 if (!getIdentifier())
2914 unsigned BuiltinID = getIdentifier()->getBuiltinID();
2918 ASTContext &Context = getASTContext();
2919 if (Context.getLangOpts().CPlusPlus) {
2920 const auto *LinkageDecl =
2921 dyn_cast<LinkageSpecDecl>(getFirstDecl()->getDeclContext());
2922 // In C++, the first declaration of a builtin is always inside an implicit
2924 // FIXME: A recognised library function may not be directly in an extern "C"
2925 // declaration, for instance "extern "C" { namespace std { decl } }".
2927 if (BuiltinID == Builtin::BI__GetExceptionInfo &&
2928 Context.getTargetInfo().getCXXABI().isMicrosoft())
2929 return Builtin::BI__GetExceptionInfo;
2932 if (LinkageDecl->getLanguage() != LinkageSpecDecl::lang_c)
2936 // If the function is marked "overloadable", it has a different mangled name
2937 // and is not the C library function.
2938 if (hasAttr<OverloadableAttr>())
2941 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))
2944 // This function has the name of a known C library
2945 // function. Determine whether it actually refers to the C library
2946 // function or whether it just has the same name.
2948 // If this is a static function, it's not a builtin.
2949 if (getStorageClass() == SC_Static)
2952 // OpenCL v1.2 s6.9.f - The library functions defined in
2953 // the C99 standard headers are not available.
2954 if (Context.getLangOpts().OpenCL &&
2955 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))
2958 // CUDA does not have device-side standard library. printf and malloc are the
2959 // only special cases that are supported by device-side runtime.
2960 if (Context.getLangOpts().CUDA && hasAttr<CUDADeviceAttr>() &&
2961 !hasAttr<CUDAHostAttr>() &&
2962 !(BuiltinID == Builtin::BIprintf || BuiltinID == Builtin::BImalloc))
2968 /// getNumParams - Return the number of parameters this function must have
2969 /// based on its FunctionType. This is the length of the ParamInfo array
2970 /// after it has been created.
2971 unsigned FunctionDecl::getNumParams() const {
2972 const auto *FPT = getType()->getAs<FunctionProtoType>();
2973 return FPT ? FPT->getNumParams() : 0;
2976 void FunctionDecl::setParams(ASTContext &C,
2977 ArrayRef<ParmVarDecl *> NewParamInfo) {
2978 assert(!ParamInfo && "Already has param info!");
2979 assert(NewParamInfo.size() == getNumParams() && "Parameter count mismatch!");
2981 // Zero params -> null pointer.
2982 if (!NewParamInfo.empty()) {
2983 ParamInfo = new (C) ParmVarDecl*[NewParamInfo.size()];
2984 std::copy(NewParamInfo.begin(), NewParamInfo.end(), ParamInfo);
2988 /// getMinRequiredArguments - Returns the minimum number of arguments
2989 /// needed to call this function. This may be fewer than the number of
2990 /// function parameters, if some of the parameters have default
2991 /// arguments (in C++) or are parameter packs (C++11).
2992 unsigned FunctionDecl::getMinRequiredArguments() const {
2993 if (!getASTContext().getLangOpts().CPlusPlus)
2994 return getNumParams();
2996 unsigned NumRequiredArgs = 0;
2997 for (auto *Param : parameters())
2998 if (!Param->isParameterPack() && !Param->hasDefaultArg())
3000 return NumRequiredArgs;
3003 /// The combination of the extern and inline keywords under MSVC forces
3004 /// the function to be required.
3006 /// Note: This function assumes that we will only get called when isInlined()
3007 /// would return true for this FunctionDecl.
3008 bool FunctionDecl::isMSExternInline() const {
3009 assert(isInlined() && "expected to get called on an inlined function!");
3011 const ASTContext &Context = getASTContext();
3012 if (!Context.getTargetInfo().getCXXABI().isMicrosoft() &&
3013 !hasAttr<DLLExportAttr>())
3016 for (const FunctionDecl *FD = getMostRecentDecl(); FD;
3017 FD = FD->getPreviousDecl())
3018 if (!FD->isImplicit() && FD->getStorageClass() == SC_Extern)
3024 static bool redeclForcesDefMSVC(const FunctionDecl *Redecl) {
3025 if (Redecl->getStorageClass() != SC_Extern)
3028 for (const FunctionDecl *FD = Redecl->getPreviousDecl(); FD;
3029 FD = FD->getPreviousDecl())
3030 if (!FD->isImplicit() && FD->getStorageClass() == SC_Extern)
3036 static bool RedeclForcesDefC99(const FunctionDecl *Redecl) {
3037 // Only consider file-scope declarations in this test.
3038 if (!Redecl->getLexicalDeclContext()->isTranslationUnit())
3041 // Only consider explicit declarations; the presence of a builtin for a
3042 // libcall shouldn't affect whether a definition is externally visible.
3043 if (Redecl->isImplicit())
3046 if (!Redecl->isInlineSpecified() || Redecl->getStorageClass() == SC_Extern)
3047 return true; // Not an inline definition
3052 /// For a function declaration in C or C++, determine whether this
3053 /// declaration causes the definition to be externally visible.
3055 /// For instance, this determines if adding the current declaration to the set
3056 /// of redeclarations of the given functions causes
3057 /// isInlineDefinitionExternallyVisible to change from false to true.
3058 bool FunctionDecl::doesDeclarationForceExternallyVisibleDefinition() const {
3059 assert(!doesThisDeclarationHaveABody() &&
3060 "Must have a declaration without a body.");
3062 ASTContext &Context = getASTContext();
3064 if (Context.getLangOpts().MSVCCompat) {
3065 const FunctionDecl *Definition;
3066 if (hasBody(Definition) && Definition->isInlined() &&
3067 redeclForcesDefMSVC(this))
3071 if (Context.getLangOpts().GNUInline || hasAttr<GNUInlineAttr>()) {
3072 // With GNU inlining, a declaration with 'inline' but not 'extern', forces
3073 // an externally visible definition.
3075 // FIXME: What happens if gnu_inline gets added on after the first
3077 if (!isInlineSpecified() || getStorageClass() == SC_Extern)
3080 const FunctionDecl *Prev = this;
3081 bool FoundBody = false;
3082 while ((Prev = Prev->getPreviousDecl())) {
3083 FoundBody |= Prev->Body.isValid();
3086 // If it's not the case that both 'inline' and 'extern' are
3087 // specified on the definition, then it is always externally visible.
3088 if (!Prev->isInlineSpecified() ||
3089 Prev->getStorageClass() != SC_Extern)
3091 } else if (Prev->isInlineSpecified() &&
3092 Prev->getStorageClass() != SC_Extern) {
3099 if (Context.getLangOpts().CPlusPlus)
3103 // [...] If all of the file scope declarations for a function in a
3104 // translation unit include the inline function specifier without extern,
3105 // then the definition in that translation unit is an inline definition.
3106 if (isInlineSpecified() && getStorageClass() != SC_Extern)
3108 const FunctionDecl *Prev = this;
3109 bool FoundBody = false;
3110 while ((Prev = Prev->getPreviousDecl())) {
3111 FoundBody |= Prev->Body.isValid();
3112 if (RedeclForcesDefC99(Prev))
3118 SourceRange FunctionDecl::getReturnTypeSourceRange() const {
3119 const TypeSourceInfo *TSI = getTypeSourceInfo();
3121 return SourceRange();
3122 FunctionTypeLoc FTL =
3123 TSI->getTypeLoc().IgnoreParens().getAs<FunctionTypeLoc>();
3125 return SourceRange();
3127 // Skip self-referential return types.
3128 const SourceManager &SM = getASTContext().getSourceManager();
3129 SourceRange RTRange = FTL.getReturnLoc().getSourceRange();
3130 SourceLocation Boundary = getNameInfo().getLocStart();
3131 if (RTRange.isInvalid() || Boundary.isInvalid() ||
3132 !SM.isBeforeInTranslationUnit(RTRange.getEnd(), Boundary))
3133 return SourceRange();
3138 SourceRange FunctionDecl::getExceptionSpecSourceRange() const {
3139 const TypeSourceInfo *TSI = getTypeSourceInfo();
3141 return SourceRange();
3142 FunctionTypeLoc FTL =
3143 TSI->getTypeLoc().IgnoreParens().getAs<FunctionTypeLoc>();
3145 return SourceRange();
3147 return FTL.getExceptionSpecRange();
3150 const Attr *FunctionDecl::getUnusedResultAttr() const {
3151 QualType RetType = getReturnType();
3152 if (RetType->isRecordType()) {
3153 if (const auto *Ret =
3154 dyn_cast_or_null<RecordDecl>(RetType->getAsTagDecl())) {
3155 if (const auto *R = Ret->getAttr<WarnUnusedResultAttr>())
3158 } else if (const auto *ET = RetType->getAs<EnumType>()) {
3159 if (const EnumDecl *ED = ET->getDecl()) {
3160 if (const auto *R = ED->getAttr<WarnUnusedResultAttr>())
3164 return getAttr<WarnUnusedResultAttr>();
3167 /// For an inline function definition in C, or for a gnu_inline function
3168 /// in C++, determine whether the definition will be externally visible.
3170 /// Inline function definitions are always available for inlining optimizations.
3171 /// However, depending on the language dialect, declaration specifiers, and
3172 /// attributes, the definition of an inline function may or may not be
3173 /// "externally" visible to other translation units in the program.
3175 /// In C99, inline definitions are not externally visible by default. However,
3176 /// if even one of the global-scope declarations is marked "extern inline", the
3177 /// inline definition becomes externally visible (C99 6.7.4p6).
3179 /// In GNU89 mode, or if the gnu_inline attribute is attached to the function
3180 /// definition, we use the GNU semantics for inline, which are nearly the
3181 /// opposite of C99 semantics. In particular, "inline" by itself will create
3182 /// an externally visible symbol, but "extern inline" will not create an
3183 /// externally visible symbol.
3184 bool FunctionDecl::isInlineDefinitionExternallyVisible() const {
3185 assert((doesThisDeclarationHaveABody() || willHaveBody()) &&
3186 "Must be a function definition");
3187 assert(isInlined() && "Function must be inline");
3188 ASTContext &Context = getASTContext();
3190 if (Context.getLangOpts().GNUInline || hasAttr<GNUInlineAttr>()) {
3191 // Note: If you change the logic here, please change
3192 // doesDeclarationForceExternallyVisibleDefinition as well.
3194 // If it's not the case that both 'inline' and 'extern' are
3195 // specified on the definition, then this inline definition is
3196 // externally visible.
3197 if (!(isInlineSpecified() && getStorageClass() == SC_Extern))
3200 // If any declaration is 'inline' but not 'extern', then this definition
3201 // is externally visible.
3202 for (auto Redecl : redecls()) {
3203 if (Redecl->isInlineSpecified() &&
3204 Redecl->getStorageClass() != SC_Extern)
3211 // The rest of this function is C-only.
3212 assert(!Context.getLangOpts().CPlusPlus &&
3213 "should not use C inline rules in C++");
3216 // [...] If all of the file scope declarations for a function in a
3217 // translation unit include the inline function specifier without extern,
3218 // then the definition in that translation unit is an inline definition.
3219 for (auto Redecl : redecls()) {
3220 if (RedeclForcesDefC99(Redecl))
3225 // An inline definition does not provide an external definition for the
3226 // function, and does not forbid an external definition in another
3227 // translation unit.
3231 /// getOverloadedOperator - Which C++ overloaded operator this
3232 /// function represents, if any.
3233 OverloadedOperatorKind FunctionDecl::getOverloadedOperator() const {
3234 if (getDeclName().getNameKind() == DeclarationName::CXXOperatorName)
3235 return getDeclName().getCXXOverloadedOperator();
3240 /// getLiteralIdentifier - The literal suffix identifier this function
3241 /// represents, if any.
3242 const IdentifierInfo *FunctionDecl::getLiteralIdentifier() const {
3243 if (getDeclName().getNameKind() == DeclarationName::CXXLiteralOperatorName)
3244 return getDeclName().getCXXLiteralIdentifier();
3249 FunctionDecl::TemplatedKind FunctionDecl::getTemplatedKind() const {
3250 if (TemplateOrSpecialization.isNull())
3251 return TK_NonTemplate;
3252 if (TemplateOrSpecialization.is<FunctionTemplateDecl *>())
3253 return TK_FunctionTemplate;
3254 if (TemplateOrSpecialization.is<MemberSpecializationInfo *>())
3255 return TK_MemberSpecialization;
3256 if (TemplateOrSpecialization.is<FunctionTemplateSpecializationInfo *>())
3257 return TK_FunctionTemplateSpecialization;
3258 if (TemplateOrSpecialization.is
3259 <DependentFunctionTemplateSpecializationInfo*>())
3260 return TK_DependentFunctionTemplateSpecialization;
3262 llvm_unreachable("Did we miss a TemplateOrSpecialization type?");
3265 FunctionDecl *FunctionDecl::getInstantiatedFromMemberFunction() const {
3266 if (MemberSpecializationInfo *Info = getMemberSpecializationInfo())
3267 return cast<FunctionDecl>(Info->getInstantiatedFrom());
3272 MemberSpecializationInfo *FunctionDecl::getMemberSpecializationInfo() const {
3273 return TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>();
3277 FunctionDecl::setInstantiationOfMemberFunction(ASTContext &C,
3279 TemplateSpecializationKind TSK) {
3280 assert(TemplateOrSpecialization.isNull() &&
3281 "Member function is already a specialization");
3282 MemberSpecializationInfo *Info
3283 = new (C) MemberSpecializationInfo(FD, TSK);
3284 TemplateOrSpecialization = Info;
3287 FunctionTemplateDecl *FunctionDecl::getDescribedFunctionTemplate() const {
3288 return TemplateOrSpecialization.dyn_cast<FunctionTemplateDecl *>();
3291 void FunctionDecl::setDescribedFunctionTemplate(FunctionTemplateDecl *Template) {
3292 TemplateOrSpecialization = Template;
3295 bool FunctionDecl::isImplicitlyInstantiable() const {
3296 // If the function is invalid, it can't be implicitly instantiated.
3297 if (isInvalidDecl())
3300 switch (getTemplateSpecializationKind()) {
3301 case TSK_Undeclared:
3302 case TSK_ExplicitInstantiationDefinition:
3305 case TSK_ImplicitInstantiation:
3308 // It is possible to instantiate TSK_ExplicitSpecialization kind
3309 // if the FunctionDecl has a class scope specialization pattern.
3310 case TSK_ExplicitSpecialization:
3311 return getClassScopeSpecializationPattern() != nullptr;
3313 case TSK_ExplicitInstantiationDeclaration:
3318 // Find the actual template from which we will instantiate.
3319 const FunctionDecl *PatternDecl = getTemplateInstantiationPattern();
3320 bool HasPattern = false;
3322 HasPattern = PatternDecl->hasBody(PatternDecl);
3324 // C++0x [temp.explicit]p9:
3325 // Except for inline functions, other explicit instantiation declarations
3326 // have the effect of suppressing the implicit instantiation of the entity
3327 // to which they refer.
3328 if (!HasPattern || !PatternDecl)
3331 return PatternDecl->isInlined();
3334 bool FunctionDecl::isTemplateInstantiation() const {
3335 switch (getTemplateSpecializationKind()) {
3336 case TSK_Undeclared:
3337 case TSK_ExplicitSpecialization:
3339 case TSK_ImplicitInstantiation:
3340 case TSK_ExplicitInstantiationDeclaration:
3341 case TSK_ExplicitInstantiationDefinition:
3344 llvm_unreachable("All TSK values handled.");
3347 FunctionDecl *FunctionDecl::getTemplateInstantiationPattern() const {
3348 // Handle class scope explicit specialization special case.
3349 if (getTemplateSpecializationKind() == TSK_ExplicitSpecialization) {
3350 if (auto *Spec = getClassScopeSpecializationPattern())
3351 return getDefinitionOrSelf(Spec);
3355 // If this is a generic lambda call operator specialization, its
3356 // instantiation pattern is always its primary template's pattern
3357 // even if its primary template was instantiated from another
3358 // member template (which happens with nested generic lambdas).
3359 // Since a lambda's call operator's body is transformed eagerly,
3360 // we don't have to go hunting for a prototype definition template
3361 // (i.e. instantiated-from-member-template) to use as an instantiation
3364 if (isGenericLambdaCallOperatorSpecialization(
3365 dyn_cast<CXXMethodDecl>(this))) {
3366 assert(getPrimaryTemplate() && "not a generic lambda call operator?");
3367 return getDefinitionOrSelf(getPrimaryTemplate()->getTemplatedDecl());
3370 if (FunctionTemplateDecl *Primary = getPrimaryTemplate()) {
3371 while (Primary->getInstantiatedFromMemberTemplate()) {
3372 // If we have hit a point where the user provided a specialization of
3373 // this template, we're done looking.
3374 if (Primary->isMemberSpecialization())
3376 Primary = Primary->getInstantiatedFromMemberTemplate();
3379 return getDefinitionOrSelf(Primary->getTemplatedDecl());
3382 if (auto *MFD = getInstantiatedFromMemberFunction())
3383 return getDefinitionOrSelf(MFD);
3388 FunctionTemplateDecl *FunctionDecl::getPrimaryTemplate() const {
3389 if (FunctionTemplateSpecializationInfo *Info
3390 = TemplateOrSpecialization
3391 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3392 return Info->Template.getPointer();
3397 FunctionDecl *FunctionDecl::getClassScopeSpecializationPattern() const {
3398 return getASTContext().getClassScopeSpecializationPattern(this);
3401 FunctionTemplateSpecializationInfo *
3402 FunctionDecl::getTemplateSpecializationInfo() const {
3403 return TemplateOrSpecialization
3404 .dyn_cast<FunctionTemplateSpecializationInfo *>();
3407 const TemplateArgumentList *
3408 FunctionDecl::getTemplateSpecializationArgs() const {
3409 if (FunctionTemplateSpecializationInfo *Info
3410 = TemplateOrSpecialization
3411 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3412 return Info->TemplateArguments;
3417 const ASTTemplateArgumentListInfo *
3418 FunctionDecl::getTemplateSpecializationArgsAsWritten() const {
3419 if (FunctionTemplateSpecializationInfo *Info
3420 = TemplateOrSpecialization
3421 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3422 return Info->TemplateArgumentsAsWritten;
3428 FunctionDecl::setFunctionTemplateSpecialization(ASTContext &C,
3429 FunctionTemplateDecl *Template,
3430 const TemplateArgumentList *TemplateArgs,
3432 TemplateSpecializationKind TSK,
3433 const TemplateArgumentListInfo *TemplateArgsAsWritten,
3434 SourceLocation PointOfInstantiation) {
3435 assert(TSK != TSK_Undeclared &&
3436 "Must specify the type of function template specialization");
3437 FunctionTemplateSpecializationInfo *Info
3438 = TemplateOrSpecialization.dyn_cast<FunctionTemplateSpecializationInfo*>();
3440 Info = FunctionTemplateSpecializationInfo::Create(C, this, Template, TSK,
3442 TemplateArgsAsWritten,
3443 PointOfInstantiation);
3444 TemplateOrSpecialization = Info;
3445 Template->addSpecialization(Info, InsertPos);
3449 FunctionDecl::setDependentTemplateSpecialization(ASTContext &Context,
3450 const UnresolvedSetImpl &Templates,
3451 const TemplateArgumentListInfo &TemplateArgs) {
3452 assert(TemplateOrSpecialization.isNull());
3453 DependentFunctionTemplateSpecializationInfo *Info =
3454 DependentFunctionTemplateSpecializationInfo::Create(Context, Templates,
3456 TemplateOrSpecialization = Info;
3459 DependentFunctionTemplateSpecializationInfo *
3460 FunctionDecl::getDependentSpecializationInfo() const {
3461 return TemplateOrSpecialization
3462 .dyn_cast<DependentFunctionTemplateSpecializationInfo *>();
3465 DependentFunctionTemplateSpecializationInfo *
3466 DependentFunctionTemplateSpecializationInfo::Create(
3467 ASTContext &Context, const UnresolvedSetImpl &Ts,
3468 const TemplateArgumentListInfo &TArgs) {
3469 void *Buffer = Context.Allocate(
3470 totalSizeToAlloc<TemplateArgumentLoc, FunctionTemplateDecl *>(
3471 TArgs.size(), Ts.size()));
3472 return new (Buffer) DependentFunctionTemplateSpecializationInfo(Ts, TArgs);
3475 DependentFunctionTemplateSpecializationInfo::
3476 DependentFunctionTemplateSpecializationInfo(const UnresolvedSetImpl &Ts,
3477 const TemplateArgumentListInfo &TArgs)
3478 : AngleLocs(TArgs.getLAngleLoc(), TArgs.getRAngleLoc()) {
3479 NumTemplates = Ts.size();
3480 NumArgs = TArgs.size();
3482 FunctionTemplateDecl **TsArray = getTrailingObjects<FunctionTemplateDecl *>();
3483 for (unsigned I = 0, E = Ts.size(); I != E; ++I)
3484 TsArray[I] = cast<FunctionTemplateDecl>(Ts[I]->getUnderlyingDecl());
3486 TemplateArgumentLoc *ArgsArray = getTrailingObjects<TemplateArgumentLoc>();
3487 for (unsigned I = 0, E = TArgs.size(); I != E; ++I)
3488 new (&ArgsArray[I]) TemplateArgumentLoc(TArgs[I]);
3491 TemplateSpecializationKind FunctionDecl::getTemplateSpecializationKind() const {
3492 // For a function template specialization, query the specialization
3493 // information object.
3494 FunctionTemplateSpecializationInfo *FTSInfo
3495 = TemplateOrSpecialization.dyn_cast<FunctionTemplateSpecializationInfo*>();
3497 return FTSInfo->getTemplateSpecializationKind();
3499 MemberSpecializationInfo *MSInfo
3500 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>();
3502 return MSInfo->getTemplateSpecializationKind();
3504 return TSK_Undeclared;
3508 FunctionDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
3509 SourceLocation PointOfInstantiation) {
3510 if (FunctionTemplateSpecializationInfo *FTSInfo
3511 = TemplateOrSpecialization.dyn_cast<
3512 FunctionTemplateSpecializationInfo*>()) {
3513 FTSInfo->setTemplateSpecializationKind(TSK);
3514 if (TSK != TSK_ExplicitSpecialization &&
3515 PointOfInstantiation.isValid() &&
3516 FTSInfo->getPointOfInstantiation().isInvalid()) {
3517 FTSInfo->setPointOfInstantiation(PointOfInstantiation);
3518 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
3519 L->InstantiationRequested(this);
3521 } else if (MemberSpecializationInfo *MSInfo
3522 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>()) {
3523 MSInfo->setTemplateSpecializationKind(TSK);
3524 if (TSK != TSK_ExplicitSpecialization &&
3525 PointOfInstantiation.isValid() &&
3526 MSInfo->getPointOfInstantiation().isInvalid()) {
3527 MSInfo->setPointOfInstantiation(PointOfInstantiation);
3528 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
3529 L->InstantiationRequested(this);
3532 llvm_unreachable("Function cannot have a template specialization kind");
3535 SourceLocation FunctionDecl::getPointOfInstantiation() const {
3536 if (FunctionTemplateSpecializationInfo *FTSInfo
3537 = TemplateOrSpecialization.dyn_cast<
3538 FunctionTemplateSpecializationInfo*>())
3539 return FTSInfo->getPointOfInstantiation();
3540 else if (MemberSpecializationInfo *MSInfo
3541 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>())
3542 return MSInfo->getPointOfInstantiation();
3544 return SourceLocation();
3547 bool FunctionDecl::isOutOfLine() const {
3548 if (Decl::isOutOfLine())
3551 // If this function was instantiated from a member function of a
3552 // class template, check whether that member function was defined out-of-line.
3553 if (FunctionDecl *FD = getInstantiatedFromMemberFunction()) {
3554 const FunctionDecl *Definition;
3555 if (FD->hasBody(Definition))
3556 return Definition->isOutOfLine();
3559 // If this function was instantiated from a function template,
3560 // check whether that function template was defined out-of-line.
3561 if (FunctionTemplateDecl *FunTmpl = getPrimaryTemplate()) {
3562 const FunctionDecl *Definition;
3563 if (FunTmpl->getTemplatedDecl()->hasBody(Definition))
3564 return Definition->isOutOfLine();
3570 SourceRange FunctionDecl::getSourceRange() const {
3571 return SourceRange(getOuterLocStart(), EndRangeLoc);
3574 unsigned FunctionDecl::getMemoryFunctionKind() const {
3575 IdentifierInfo *FnInfo = getIdentifier();
3580 // Builtin handling.
3581 switch (getBuiltinID()) {
3582 case Builtin::BI__builtin_memset:
3583 case Builtin::BI__builtin___memset_chk:
3584 case Builtin::BImemset:
3585 return Builtin::BImemset;
3587 case Builtin::BI__builtin_memcpy:
3588 case Builtin::BI__builtin___memcpy_chk:
3589 case Builtin::BImemcpy:
3590 return Builtin::BImemcpy;
3592 case Builtin::BI__builtin_memmove:
3593 case Builtin::BI__builtin___memmove_chk:
3594 case Builtin::BImemmove:
3595 return Builtin::BImemmove;
3597 case Builtin::BIstrlcpy:
3598 case Builtin::BI__builtin___strlcpy_chk:
3599 return Builtin::BIstrlcpy;
3601 case Builtin::BIstrlcat:
3602 case Builtin::BI__builtin___strlcat_chk:
3603 return Builtin::BIstrlcat;
3605 case Builtin::BI__builtin_memcmp:
3606 case Builtin::BImemcmp:
3607 return Builtin::BImemcmp;
3609 case Builtin::BI__builtin_strncpy:
3610 case Builtin::BI__builtin___strncpy_chk:
3611 case Builtin::BIstrncpy:
3612 return Builtin::BIstrncpy;
3614 case Builtin::BI__builtin_strncmp:
3615 case Builtin::BIstrncmp:
3616 return Builtin::BIstrncmp;
3618 case Builtin::BI__builtin_strncasecmp:
3619 case Builtin::BIstrncasecmp:
3620 return Builtin::BIstrncasecmp;
3622 case Builtin::BI__builtin_strncat:
3623 case Builtin::BI__builtin___strncat_chk:
3624 case Builtin::BIstrncat:
3625 return Builtin::BIstrncat;
3627 case Builtin::BI__builtin_strndup:
3628 case Builtin::BIstrndup:
3629 return Builtin::BIstrndup;
3631 case Builtin::BI__builtin_strlen:
3632 case Builtin::BIstrlen:
3633 return Builtin::BIstrlen;
3635 case Builtin::BI__builtin_bzero:
3636 case Builtin::BIbzero:
3637 return Builtin::BIbzero;
3641 if (FnInfo->isStr("memset"))
3642 return Builtin::BImemset;
3643 else if (FnInfo->isStr("memcpy"))
3644 return Builtin::BImemcpy;
3645 else if (FnInfo->isStr("memmove"))
3646 return Builtin::BImemmove;
3647 else if (FnInfo->isStr("memcmp"))
3648 return Builtin::BImemcmp;
3649 else if (FnInfo->isStr("strncpy"))
3650 return Builtin::BIstrncpy;
3651 else if (FnInfo->isStr("strncmp"))
3652 return Builtin::BIstrncmp;
3653 else if (FnInfo->isStr("strncasecmp"))
3654 return Builtin::BIstrncasecmp;
3655 else if (FnInfo->isStr("strncat"))
3656 return Builtin::BIstrncat;
3657 else if (FnInfo->isStr("strndup"))
3658 return Builtin::BIstrndup;
3659 else if (FnInfo->isStr("strlen"))
3660 return Builtin::BIstrlen;
3661 else if (FnInfo->isStr("bzero"))
3662 return Builtin::BIbzero;
3669 unsigned FunctionDecl::getODRHash() const {
3674 unsigned FunctionDecl::getODRHash() {
3678 if (auto *FT = getInstantiatedFromMemberFunction()) {
3680 ODRHash = FT->getODRHash();
3685 Hash.AddFunctionDecl(this);
3687 ODRHash = Hash.CalculateHash();
3691 //===----------------------------------------------------------------------===//
3692 // FieldDecl Implementation
3693 //===----------------------------------------------------------------------===//
3695 FieldDecl *FieldDecl::Create(const ASTContext &C, DeclContext *DC,
3696 SourceLocation StartLoc, SourceLocation IdLoc,
3697 IdentifierInfo *Id, QualType T,
3698 TypeSourceInfo *TInfo, Expr *BW, bool Mutable,
3699 InClassInitStyle InitStyle) {
3700 return new (C, DC) FieldDecl(Decl::Field, DC, StartLoc, IdLoc, Id, T, TInfo,
3701 BW, Mutable, InitStyle);
3704 FieldDecl *FieldDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
3705 return new (C, ID) FieldDecl(Field, nullptr, SourceLocation(),
3706 SourceLocation(), nullptr, QualType(), nullptr,
3707 nullptr, false, ICIS_NoInit);
3710 bool FieldDecl::isAnonymousStructOrUnion() const {
3711 if (!isImplicit() || getDeclName())
3714 if (const auto *Record = getType()->getAs<RecordType>())
3715 return Record->getDecl()->isAnonymousStructOrUnion();
3720 unsigned FieldDecl::getBitWidthValue(const ASTContext &Ctx) const {
3721 assert(isBitField() && "not a bitfield");
3722 return getBitWidth()->EvaluateKnownConstInt(Ctx).getZExtValue();
3725 bool FieldDecl::isZeroLengthBitField(const ASTContext &Ctx) const {
3726 return isUnnamedBitfield() && !getBitWidth()->isValueDependent() &&
3727 getBitWidthValue(Ctx) == 0;
3730 unsigned FieldDecl::getFieldIndex() const {
3731 const FieldDecl *Canonical = getCanonicalDecl();
3732 if (Canonical != this)
3733 return Canonical->getFieldIndex();
3735 if (CachedFieldIndex) return CachedFieldIndex - 1;
3738 const RecordDecl *RD = getParent()->getDefinition();
3739 assert(RD && "requested index for field of struct with no definition");
3741 for (auto *Field : RD->fields()) {
3742 Field->getCanonicalDecl()->CachedFieldIndex = Index + 1;
3746 assert(CachedFieldIndex && "failed to find field in parent");
3747 return CachedFieldIndex - 1;
3750 SourceRange FieldDecl::getSourceRange() const {
3751 const Expr *FinalExpr = getInClassInitializer();
3753 FinalExpr = getBitWidth();
3755 return SourceRange(getInnerLocStart(), FinalExpr->getLocEnd());
3756 return DeclaratorDecl::getSourceRange();
3759 void FieldDecl::setCapturedVLAType(const VariableArrayType *VLAType) {
3760 assert((getParent()->isLambda() || getParent()->isCapturedRecord()) &&
3761 "capturing type in non-lambda or captured record.");
3762 assert(InitStorage.getInt() == ISK_NoInit &&
3763 InitStorage.getPointer() == nullptr &&
3764 "bit width, initializer or captured type already set");
3765 InitStorage.setPointerAndInt(const_cast<VariableArrayType *>(VLAType),
3766 ISK_CapturedVLAType);
3769 //===----------------------------------------------------------------------===//
3770 // TagDecl Implementation
3771 //===----------------------------------------------------------------------===//
3773 SourceLocation TagDecl::getOuterLocStart() const {
3774 return getTemplateOrInnerLocStart(this);
3777 SourceRange TagDecl::getSourceRange() const {
3778 SourceLocation RBraceLoc = BraceRange.getEnd();
3779 SourceLocation E = RBraceLoc.isValid() ? RBraceLoc : getLocation();
3780 return SourceRange(getOuterLocStart(), E);
3783 TagDecl *TagDecl::getCanonicalDecl() { return getFirstDecl(); }
3785 void TagDecl::setTypedefNameForAnonDecl(TypedefNameDecl *TDD) {
3786 TypedefNameDeclOrQualifier = TDD;
3787 if (const Type *T = getTypeForDecl()) {
3789 assert(T->isLinkageValid());
3791 assert(isLinkageValid());
3794 void TagDecl::startDefinition() {
3795 IsBeingDefined = true;
3797 if (auto *D = dyn_cast<CXXRecordDecl>(this)) {
3798 struct CXXRecordDecl::DefinitionData *Data =
3799 new (getASTContext()) struct CXXRecordDecl::DefinitionData(D);
3800 for (auto I : redecls())
3801 cast<CXXRecordDecl>(I)->DefinitionData = Data;
3805 void TagDecl::completeDefinition() {
3806 assert((!isa<CXXRecordDecl>(this) ||
3807 cast<CXXRecordDecl>(this)->hasDefinition()) &&
3808 "definition completed but not started");
3810 IsCompleteDefinition = true;
3811 IsBeingDefined = false;
3813 if (ASTMutationListener *L = getASTMutationListener())
3814 L->CompletedTagDefinition(this);
3817 TagDecl *TagDecl::getDefinition() const {
3818 if (isCompleteDefinition())
3819 return const_cast<TagDecl *>(this);
3821 // If it's possible for us to have an out-of-date definition, check now.
3822 if (MayHaveOutOfDateDef) {
3823 if (IdentifierInfo *II = getIdentifier()) {
3824 if (II->isOutOfDate()) {
3825 updateOutOfDate(*II);
3830 if (const auto *CXXRD = dyn_cast<CXXRecordDecl>(this))
3831 return CXXRD->getDefinition();
3833 for (auto R : redecls())
3834 if (R->isCompleteDefinition())
3840 void TagDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) {
3842 // Make sure the extended qualifier info is allocated.
3844 TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo;
3845 // Set qualifier info.
3846 getExtInfo()->QualifierLoc = QualifierLoc;
3848 // Here Qualifier == 0, i.e., we are removing the qualifier (if any).
3850 if (getExtInfo()->NumTemplParamLists == 0) {
3851 getASTContext().Deallocate(getExtInfo());
3852 TypedefNameDeclOrQualifier = (TypedefNameDecl *)nullptr;
3855 getExtInfo()->QualifierLoc = QualifierLoc;
3860 void TagDecl::setTemplateParameterListsInfo(
3861 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
3862 assert(!TPLists.empty());
3863 // Make sure the extended decl info is allocated.
3865 // Allocate external info struct.
3866 TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo;
3867 // Set the template parameter lists info.
3868 getExtInfo()->setTemplateParameterListsInfo(Context, TPLists);
3871 //===----------------------------------------------------------------------===//
3872 // EnumDecl Implementation
3873 //===----------------------------------------------------------------------===//
3875 void EnumDecl::anchor() {}
3877 EnumDecl *EnumDecl::Create(ASTContext &C, DeclContext *DC,
3878 SourceLocation StartLoc, SourceLocation IdLoc,
3880 EnumDecl *PrevDecl, bool IsScoped,
3881 bool IsScopedUsingClassTag, bool IsFixed) {
3882 auto *Enum = new (C, DC) EnumDecl(C, DC, StartLoc, IdLoc, Id, PrevDecl,
3883 IsScoped, IsScopedUsingClassTag, IsFixed);
3884 Enum->MayHaveOutOfDateDef = C.getLangOpts().Modules;
3885 C.getTypeDeclType(Enum, PrevDecl);
3889 EnumDecl *EnumDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
3891 new (C, ID) EnumDecl(C, nullptr, SourceLocation(), SourceLocation(),
3892 nullptr, nullptr, false, false, false);
3893 Enum->MayHaveOutOfDateDef = C.getLangOpts().Modules;
3897 SourceRange EnumDecl::getIntegerTypeRange() const {
3898 if (const TypeSourceInfo *TI = getIntegerTypeSourceInfo())
3899 return TI->getTypeLoc().getSourceRange();
3900 return SourceRange();
3903 void EnumDecl::completeDefinition(QualType NewType,
3904 QualType NewPromotionType,
3905 unsigned NumPositiveBits,
3906 unsigned NumNegativeBits) {
3907 assert(!isCompleteDefinition() && "Cannot redefine enums!");
3909 IntegerType = NewType.getTypePtr();
3910 PromotionType = NewPromotionType;
3911 setNumPositiveBits(NumPositiveBits);
3912 setNumNegativeBits(NumNegativeBits);
3913 TagDecl::completeDefinition();
3916 bool EnumDecl::isClosed() const {
3917 if (const auto *A = getAttr<EnumExtensibilityAttr>())
3918 return A->getExtensibility() == EnumExtensibilityAttr::Closed;
3922 bool EnumDecl::isClosedFlag() const {
3923 return isClosed() && hasAttr<FlagEnumAttr>();
3926 bool EnumDecl::isClosedNonFlag() const {
3927 return isClosed() && !hasAttr<FlagEnumAttr>();
3930 TemplateSpecializationKind EnumDecl::getTemplateSpecializationKind() const {
3931 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
3932 return MSI->getTemplateSpecializationKind();
3934 return TSK_Undeclared;
3937 void EnumDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
3938 SourceLocation PointOfInstantiation) {
3939 MemberSpecializationInfo *MSI = getMemberSpecializationInfo();
3940 assert(MSI && "Not an instantiated member enumeration?");
3941 MSI->setTemplateSpecializationKind(TSK);
3942 if (TSK != TSK_ExplicitSpecialization &&
3943 PointOfInstantiation.isValid() &&
3944 MSI->getPointOfInstantiation().isInvalid())
3945 MSI->setPointOfInstantiation(PointOfInstantiation);
3948 EnumDecl *EnumDecl::getTemplateInstantiationPattern() const {
3949 if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo()) {
3950 if (isTemplateInstantiation(MSInfo->getTemplateSpecializationKind())) {
3951 EnumDecl *ED = getInstantiatedFromMemberEnum();
3952 while (auto *NewED = ED->getInstantiatedFromMemberEnum())
3954 return getDefinitionOrSelf(ED);
3958 assert(!isTemplateInstantiation(getTemplateSpecializationKind()) &&
3959 "couldn't find pattern for enum instantiation");
3963 EnumDecl *EnumDecl::getInstantiatedFromMemberEnum() const {
3964 if (SpecializationInfo)
3965 return cast<EnumDecl>(SpecializationInfo->getInstantiatedFrom());
3970 void EnumDecl::setInstantiationOfMemberEnum(ASTContext &C, EnumDecl *ED,
3971 TemplateSpecializationKind TSK) {
3972 assert(!SpecializationInfo && "Member enum is already a specialization");
3973 SpecializationInfo = new (C) MemberSpecializationInfo(ED, TSK);
3976 unsigned EnumDecl::getODRHash() {
3981 Hash.AddEnumDecl(this);
3983 ODRHash = Hash.CalculateHash();
3987 //===----------------------------------------------------------------------===//
3988 // RecordDecl Implementation
3989 //===----------------------------------------------------------------------===//
3991 RecordDecl::RecordDecl(Kind DK, TagKind TK, const ASTContext &C,
3992 DeclContext *DC, SourceLocation StartLoc,
3993 SourceLocation IdLoc, IdentifierInfo *Id,
3994 RecordDecl *PrevDecl)
3995 : TagDecl(DK, TK, C, DC, IdLoc, Id, PrevDecl, StartLoc),
3996 HasFlexibleArrayMember(false), AnonymousStructOrUnion(false),
3997 HasObjectMember(false), HasVolatileMember(false),
3998 LoadedFieldsFromExternalStorage(false),
3999 NonTrivialToPrimitiveDefaultInitialize(false),
4000 NonTrivialToPrimitiveCopy(false), NonTrivialToPrimitiveDestroy(false),
4001 ParamDestroyedInCallee(false), ArgPassingRestrictions(APK_CanPassInRegs) {
4002 assert(classof(static_cast<Decl*>(this)) && "Invalid Kind!");
4005 RecordDecl *RecordDecl::Create(const ASTContext &C, TagKind TK, DeclContext *DC,
4006 SourceLocation StartLoc, SourceLocation IdLoc,
4007 IdentifierInfo *Id, RecordDecl* PrevDecl) {
4008 RecordDecl *R = new (C, DC) RecordDecl(Record, TK, C, DC,
4009 StartLoc, IdLoc, Id, PrevDecl);
4010 R->MayHaveOutOfDateDef = C.getLangOpts().Modules;
4012 C.getTypeDeclType(R, PrevDecl);
4016 RecordDecl *RecordDecl::CreateDeserialized(const ASTContext &C, unsigned ID) {
4018 new (C, ID) RecordDecl(Record, TTK_Struct, C, nullptr, SourceLocation(),
4019 SourceLocation(), nullptr, nullptr);
4020 R->MayHaveOutOfDateDef = C.getLangOpts().Modules;
4024 bool RecordDecl::isInjectedClassName() const {
4025 return isImplicit() && getDeclName() && getDeclContext()->isRecord() &&
4026 cast<RecordDecl>(getDeclContext())->getDeclName() == getDeclName();
4029 bool RecordDecl::isLambda() const {
4030 if (auto RD = dyn_cast<CXXRecordDecl>(this))
4031 return RD->isLambda();
4035 bool RecordDecl::isCapturedRecord() const {
4036 return hasAttr<CapturedRecordAttr>();
4039 void RecordDecl::setCapturedRecord() {
4040 addAttr(CapturedRecordAttr::CreateImplicit(getASTContext()));
4043 RecordDecl::field_iterator RecordDecl::field_begin() const {
4044 if (hasExternalLexicalStorage() && !LoadedFieldsFromExternalStorage)
4045 LoadFieldsFromExternalStorage();
4047 return field_iterator(decl_iterator(FirstDecl));
4050 /// completeDefinition - Notes that the definition of this type is now
4052 void RecordDecl::completeDefinition() {
4053 assert(!isCompleteDefinition() && "Cannot redefine record!");
4054 TagDecl::completeDefinition();
4057 /// isMsStruct - Get whether or not this record uses ms_struct layout.
4058 /// This which can be turned on with an attribute, pragma, or the
4059 /// -mms-bitfields command-line option.
4060 bool RecordDecl::isMsStruct(const ASTContext &C) const {
4061 return hasAttr<MSStructAttr>() || C.getLangOpts().MSBitfields == 1;
4064 void RecordDecl::LoadFieldsFromExternalStorage() const {
4065 ExternalASTSource *Source = getASTContext().getExternalSource();
4066 assert(hasExternalLexicalStorage() && Source && "No external storage?");
4068 // Notify that we have a RecordDecl doing some initialization.
4069 ExternalASTSource::Deserializing TheFields(Source);
4071 SmallVector<Decl*, 64> Decls;
4072 LoadedFieldsFromExternalStorage = true;
4073 Source->FindExternalLexicalDecls(this, [](Decl::Kind K) {
4074 return FieldDecl::classofKind(K) || IndirectFieldDecl::classofKind(K);
4078 // Check that all decls we got were FieldDecls.
4079 for (unsigned i=0, e=Decls.size(); i != e; ++i)
4080 assert(isa<FieldDecl>(Decls[i]) || isa<IndirectFieldDecl>(Decls[i]));
4086 std::tie(FirstDecl, LastDecl) = BuildDeclChain(Decls,
4087 /*FieldsAlreadyLoaded=*/false);
4090 bool RecordDecl::mayInsertExtraPadding(bool EmitRemark) const {
4091 ASTContext &Context = getASTContext();
4092 const SanitizerMask EnabledAsanMask = Context.getLangOpts().Sanitize.Mask &
4093 (SanitizerKind::Address | SanitizerKind::KernelAddress);
4094 if (!EnabledAsanMask || !Context.getLangOpts().SanitizeAddressFieldPadding)
4096 const auto &Blacklist = Context.getSanitizerBlacklist();
4097 const auto *CXXRD = dyn_cast<CXXRecordDecl>(this);
4098 // We may be able to relax some of these requirements.
4099 int ReasonToReject = -1;
4100 if (!CXXRD || CXXRD->isExternCContext())
4101 ReasonToReject = 0; // is not C++.
4102 else if (CXXRD->hasAttr<PackedAttr>())
4103 ReasonToReject = 1; // is packed.
4104 else if (CXXRD->isUnion())
4105 ReasonToReject = 2; // is a union.
4106 else if (CXXRD->isTriviallyCopyable())
4107 ReasonToReject = 3; // is trivially copyable.
4108 else if (CXXRD->hasTrivialDestructor())
4109 ReasonToReject = 4; // has trivial destructor.
4110 else if (CXXRD->isStandardLayout())
4111 ReasonToReject = 5; // is standard layout.
4112 else if (Blacklist.isBlacklistedLocation(EnabledAsanMask, getLocation(),
4114 ReasonToReject = 6; // is in a blacklisted file.
4115 else if (Blacklist.isBlacklistedType(EnabledAsanMask,
4116 getQualifiedNameAsString(),
4118 ReasonToReject = 7; // is blacklisted.
4121 if (ReasonToReject >= 0)
4122 Context.getDiagnostics().Report(
4124 diag::remark_sanitize_address_insert_extra_padding_rejected)
4125 << getQualifiedNameAsString() << ReasonToReject;
4127 Context.getDiagnostics().Report(
4129 diag::remark_sanitize_address_insert_extra_padding_accepted)
4130 << getQualifiedNameAsString();
4132 return ReasonToReject < 0;
4135 const FieldDecl *RecordDecl::findFirstNamedDataMember() const {
4136 for (const auto *I : fields()) {
4137 if (I->getIdentifier())
4140 if (const auto *RT = I->getType()->getAs<RecordType>())
4141 if (const FieldDecl *NamedDataMember =
4142 RT->getDecl()->findFirstNamedDataMember())
4143 return NamedDataMember;
4146 // We didn't find a named data member.
4150 //===----------------------------------------------------------------------===//
4151 // BlockDecl Implementation
4152 //===----------------------------------------------------------------------===//
4154 void BlockDecl::setParams(ArrayRef<ParmVarDecl *> NewParamInfo) {
4155 assert(!ParamInfo && "Already has param info!");
4157 // Zero params -> null pointer.
4158 if (!NewParamInfo.empty()) {
4159 NumParams = NewParamInfo.size();
4160 ParamInfo = new (getASTContext()) ParmVarDecl*[NewParamInfo.size()];
4161 std::copy(NewParamInfo.begin(), NewParamInfo.end(), ParamInfo);
4165 void BlockDecl::setCaptures(ASTContext &Context, ArrayRef<Capture> Captures,
4166 bool CapturesCXXThis) {
4167 this->CapturesCXXThis = CapturesCXXThis;
4168 this->NumCaptures = Captures.size();
4170 if (Captures.empty()) {
4171 this->Captures = nullptr;
4175 this->Captures = Captures.copy(Context).data();
4178 bool BlockDecl::capturesVariable(const VarDecl *variable) const {
4179 for (const auto &I : captures())
4180 // Only auto vars can be captured, so no redeclaration worries.
4181 if (I.getVariable() == variable)
4187 SourceRange BlockDecl::getSourceRange() const {
4188 return SourceRange(getLocation(), Body? Body->getLocEnd() : getLocation());
4191 //===----------------------------------------------------------------------===//
4192 // Other Decl Allocation/Deallocation Method Implementations
4193 //===----------------------------------------------------------------------===//
4195 void TranslationUnitDecl::anchor() {}
4197 TranslationUnitDecl *TranslationUnitDecl::Create(ASTContext &C) {
4198 return new (C, (DeclContext *)nullptr) TranslationUnitDecl(C);
4201 void PragmaCommentDecl::anchor() {}
4203 PragmaCommentDecl *PragmaCommentDecl::Create(const ASTContext &C,
4204 TranslationUnitDecl *DC,
4205 SourceLocation CommentLoc,
4206 PragmaMSCommentKind CommentKind,
4208 PragmaCommentDecl *PCD =
4209 new (C, DC, additionalSizeToAlloc<char>(Arg.size() + 1))
4210 PragmaCommentDecl(DC, CommentLoc, CommentKind);
4211 memcpy(PCD->getTrailingObjects<char>(), Arg.data(), Arg.size());
4212 PCD->getTrailingObjects<char>()[Arg.size()] = '\0';
4216 PragmaCommentDecl *PragmaCommentDecl::CreateDeserialized(ASTContext &C,
4219 return new (C, ID, additionalSizeToAlloc<char>(ArgSize + 1))
4220 PragmaCommentDecl(nullptr, SourceLocation(), PCK_Unknown);
4223 void PragmaDetectMismatchDecl::anchor() {}
4225 PragmaDetectMismatchDecl *
4226 PragmaDetectMismatchDecl::Create(const ASTContext &C, TranslationUnitDecl *DC,
4227 SourceLocation Loc, StringRef Name,
4229 size_t ValueStart = Name.size() + 1;
4230 PragmaDetectMismatchDecl *PDMD =
4231 new (C, DC, additionalSizeToAlloc<char>(ValueStart + Value.size() + 1))
4232 PragmaDetectMismatchDecl(DC, Loc, ValueStart);
4233 memcpy(PDMD->getTrailingObjects<char>(), Name.data(), Name.size());
4234 PDMD->getTrailingObjects<char>()[Name.size()] = '\0';
4235 memcpy(PDMD->getTrailingObjects<char>() + ValueStart, Value.data(),
4237 PDMD->getTrailingObjects<char>()[ValueStart + Value.size()] = '\0';
4241 PragmaDetectMismatchDecl *
4242 PragmaDetectMismatchDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4243 unsigned NameValueSize) {
4244 return new (C, ID, additionalSizeToAlloc<char>(NameValueSize + 1))
4245 PragmaDetectMismatchDecl(nullptr, SourceLocation(), 0);
4248 void ExternCContextDecl::anchor() {}
4250 ExternCContextDecl *ExternCContextDecl::Create(const ASTContext &C,
4251 TranslationUnitDecl *DC) {
4252 return new (C, DC) ExternCContextDecl(DC);
4255 void LabelDecl::anchor() {}
4257 LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC,
4258 SourceLocation IdentL, IdentifierInfo *II) {
4259 return new (C, DC) LabelDecl(DC, IdentL, II, nullptr, IdentL);
4262 LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC,
4263 SourceLocation IdentL, IdentifierInfo *II,
4264 SourceLocation GnuLabelL) {
4265 assert(GnuLabelL != IdentL && "Use this only for GNU local labels");
4266 return new (C, DC) LabelDecl(DC, IdentL, II, nullptr, GnuLabelL);
4269 LabelDecl *LabelDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4270 return new (C, ID) LabelDecl(nullptr, SourceLocation(), nullptr, nullptr,
4274 void LabelDecl::setMSAsmLabel(StringRef Name) {
4275 char *Buffer = new (getASTContext(), 1) char[Name.size() + 1];
4276 memcpy(Buffer, Name.data(), Name.size());
4277 Buffer[Name.size()] = '\0';
4281 void ValueDecl::anchor() {}
4283 bool ValueDecl::isWeak() const {
4284 for (const auto *I : attrs())
4285 if (isa<WeakAttr>(I) || isa<WeakRefAttr>(I))
4288 return isWeakImported();
4291 void ImplicitParamDecl::anchor() {}
4293 ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, DeclContext *DC,
4294 SourceLocation IdLoc,
4295 IdentifierInfo *Id, QualType Type,
4296 ImplicitParamKind ParamKind) {
4297 return new (C, DC) ImplicitParamDecl(C, DC, IdLoc, Id, Type, ParamKind);
4300 ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, QualType Type,
4301 ImplicitParamKind ParamKind) {
4302 return new (C, nullptr) ImplicitParamDecl(C, Type, ParamKind);
4305 ImplicitParamDecl *ImplicitParamDecl::CreateDeserialized(ASTContext &C,
4307 return new (C, ID) ImplicitParamDecl(C, QualType(), ImplicitParamKind::Other);
4310 FunctionDecl *FunctionDecl::Create(ASTContext &C, DeclContext *DC,
4311 SourceLocation StartLoc,
4312 const DeclarationNameInfo &NameInfo,
4313 QualType T, TypeSourceInfo *TInfo,
4315 bool isInlineSpecified,
4316 bool hasWrittenPrototype,
4317 bool isConstexprSpecified) {
4319 new (C, DC) FunctionDecl(Function, C, DC, StartLoc, NameInfo, T, TInfo,
4320 SC, isInlineSpecified, isConstexprSpecified);
4321 New->HasWrittenPrototype = hasWrittenPrototype;
4325 FunctionDecl *FunctionDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4326 return new (C, ID) FunctionDecl(Function, C, nullptr, SourceLocation(),
4327 DeclarationNameInfo(), QualType(), nullptr,
4328 SC_None, false, false);
4331 BlockDecl *BlockDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) {
4332 return new (C, DC) BlockDecl(DC, L);
4335 BlockDecl *BlockDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4336 return new (C, ID) BlockDecl(nullptr, SourceLocation());
4339 CapturedDecl::CapturedDecl(DeclContext *DC, unsigned NumParams)
4340 : Decl(Captured, DC, SourceLocation()), DeclContext(Captured),
4341 NumParams(NumParams), ContextParam(0), BodyAndNothrow(nullptr, false) {}
4343 CapturedDecl *CapturedDecl::Create(ASTContext &C, DeclContext *DC,
4344 unsigned NumParams) {
4345 return new (C, DC, additionalSizeToAlloc<ImplicitParamDecl *>(NumParams))
4346 CapturedDecl(DC, NumParams);
4349 CapturedDecl *CapturedDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4350 unsigned NumParams) {
4351 return new (C, ID, additionalSizeToAlloc<ImplicitParamDecl *>(NumParams))
4352 CapturedDecl(nullptr, NumParams);
4355 Stmt *CapturedDecl::getBody() const { return BodyAndNothrow.getPointer(); }
4356 void CapturedDecl::setBody(Stmt *B) { BodyAndNothrow.setPointer(B); }
4358 bool CapturedDecl::isNothrow() const { return BodyAndNothrow.getInt(); }
4359 void CapturedDecl::setNothrow(bool Nothrow) { BodyAndNothrow.setInt(Nothrow); }
4361 EnumConstantDecl *EnumConstantDecl::Create(ASTContext &C, EnumDecl *CD,
4363 IdentifierInfo *Id, QualType T,
4364 Expr *E, const llvm::APSInt &V) {
4365 return new (C, CD) EnumConstantDecl(CD, L, Id, T, E, V);
4369 EnumConstantDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4370 return new (C, ID) EnumConstantDecl(nullptr, SourceLocation(), nullptr,
4371 QualType(), nullptr, llvm::APSInt());
4374 void IndirectFieldDecl::anchor() {}
4376 IndirectFieldDecl::IndirectFieldDecl(ASTContext &C, DeclContext *DC,
4377 SourceLocation L, DeclarationName N,
4379 MutableArrayRef<NamedDecl *> CH)
4380 : ValueDecl(IndirectField, DC, L, N, T), Chaining(CH.data()),
4381 ChainingSize(CH.size()) {
4382 // In C++, indirect field declarations conflict with tag declarations in the
4383 // same scope, so add them to IDNS_Tag so that tag redeclaration finds them.
4384 if (C.getLangOpts().CPlusPlus)
4385 IdentifierNamespace |= IDNS_Tag;
4389 IndirectFieldDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L,
4390 IdentifierInfo *Id, QualType T,
4391 llvm::MutableArrayRef<NamedDecl *> CH) {
4392 return new (C, DC) IndirectFieldDecl(C, DC, L, Id, T, CH);
4395 IndirectFieldDecl *IndirectFieldDecl::CreateDeserialized(ASTContext &C,
4397 return new (C, ID) IndirectFieldDecl(C, nullptr, SourceLocation(),
4398 DeclarationName(), QualType(), None);
4401 SourceRange EnumConstantDecl::getSourceRange() const {
4402 SourceLocation End = getLocation();
4404 End = Init->getLocEnd();
4405 return SourceRange(getLocation(), End);
4408 void TypeDecl::anchor() {}
4410 TypedefDecl *TypedefDecl::Create(ASTContext &C, DeclContext *DC,
4411 SourceLocation StartLoc, SourceLocation IdLoc,
4412 IdentifierInfo *Id, TypeSourceInfo *TInfo) {
4413 return new (C, DC) TypedefDecl(C, DC, StartLoc, IdLoc, Id, TInfo);
4416 void TypedefNameDecl::anchor() {}
4418 TagDecl *TypedefNameDecl::getAnonDeclWithTypedefName(bool AnyRedecl) const {
4419 if (auto *TT = getTypeSourceInfo()->getType()->getAs<TagType>()) {
4420 auto *OwningTypedef = TT->getDecl()->getTypedefNameForAnonDecl();
4421 auto *ThisTypedef = this;
4422 if (AnyRedecl && OwningTypedef) {
4423 OwningTypedef = OwningTypedef->getCanonicalDecl();
4424 ThisTypedef = ThisTypedef->getCanonicalDecl();
4426 if (OwningTypedef == ThisTypedef)
4427 return TT->getDecl();
4433 bool TypedefNameDecl::isTransparentTagSlow() const {
4434 auto determineIsTransparent = [&]() {
4435 if (auto *TT = getUnderlyingType()->getAs<TagType>()) {
4436 if (auto *TD = TT->getDecl()) {
4437 if (TD->getName() != getName())
4439 SourceLocation TTLoc = getLocation();
4440 SourceLocation TDLoc = TD->getLocation();
4441 if (!TTLoc.isMacroID() || !TDLoc.isMacroID())
4443 SourceManager &SM = getASTContext().getSourceManager();
4444 return SM.getSpellingLoc(TTLoc) == SM.getSpellingLoc(TDLoc);
4450 bool isTransparent = determineIsTransparent();
4451 MaybeModedTInfo.setInt((isTransparent << 1) | 1);
4452 return isTransparent;
4455 TypedefDecl *TypedefDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4456 return new (C, ID) TypedefDecl(C, nullptr, SourceLocation(), SourceLocation(),
4460 TypeAliasDecl *TypeAliasDecl::Create(ASTContext &C, DeclContext *DC,
4461 SourceLocation StartLoc,
4462 SourceLocation IdLoc, IdentifierInfo *Id,
4463 TypeSourceInfo *TInfo) {
4464 return new (C, DC) TypeAliasDecl(C, DC, StartLoc, IdLoc, Id, TInfo);
4467 TypeAliasDecl *TypeAliasDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4468 return new (C, ID) TypeAliasDecl(C, nullptr, SourceLocation(),
4469 SourceLocation(), nullptr, nullptr);
4472 SourceRange TypedefDecl::getSourceRange() const {
4473 SourceLocation RangeEnd = getLocation();
4474 if (TypeSourceInfo *TInfo = getTypeSourceInfo()) {
4475 if (typeIsPostfix(TInfo->getType()))
4476 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
4478 return SourceRange(getLocStart(), RangeEnd);
4481 SourceRange TypeAliasDecl::getSourceRange() const {
4482 SourceLocation RangeEnd = getLocStart();
4483 if (TypeSourceInfo *TInfo = getTypeSourceInfo())
4484 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
4485 return SourceRange(getLocStart(), RangeEnd);
4488 void FileScopeAsmDecl::anchor() {}
4490 FileScopeAsmDecl *FileScopeAsmDecl::Create(ASTContext &C, DeclContext *DC,
4492 SourceLocation AsmLoc,
4493 SourceLocation RParenLoc) {
4494 return new (C, DC) FileScopeAsmDecl(DC, Str, AsmLoc, RParenLoc);
4497 FileScopeAsmDecl *FileScopeAsmDecl::CreateDeserialized(ASTContext &C,
4499 return new (C, ID) FileScopeAsmDecl(nullptr, nullptr, SourceLocation(),
4503 void EmptyDecl::anchor() {}
4505 EmptyDecl *EmptyDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) {
4506 return new (C, DC) EmptyDecl(DC, L);
4509 EmptyDecl *EmptyDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4510 return new (C, ID) EmptyDecl(nullptr, SourceLocation());
4513 //===----------------------------------------------------------------------===//
4514 // ImportDecl Implementation
4515 //===----------------------------------------------------------------------===//
4517 /// Retrieve the number of module identifiers needed to name the given
4519 static unsigned getNumModuleIdentifiers(Module *Mod) {
4520 unsigned Result = 1;
4521 while (Mod->Parent) {
4528 ImportDecl::ImportDecl(DeclContext *DC, SourceLocation StartLoc,
4530 ArrayRef<SourceLocation> IdentifierLocs)
4531 : Decl(Import, DC, StartLoc), ImportedAndComplete(Imported, true) {
4532 assert(getNumModuleIdentifiers(Imported) == IdentifierLocs.size());
4533 auto *StoredLocs = getTrailingObjects<SourceLocation>();
4534 std::uninitialized_copy(IdentifierLocs.begin(), IdentifierLocs.end(),
4538 ImportDecl::ImportDecl(DeclContext *DC, SourceLocation StartLoc,
4539 Module *Imported, SourceLocation EndLoc)
4540 : Decl(Import, DC, StartLoc), ImportedAndComplete(Imported, false) {
4541 *getTrailingObjects<SourceLocation>() = EndLoc;
4544 ImportDecl *ImportDecl::Create(ASTContext &C, DeclContext *DC,
4545 SourceLocation StartLoc, Module *Imported,
4546 ArrayRef<SourceLocation> IdentifierLocs) {
4548 additionalSizeToAlloc<SourceLocation>(IdentifierLocs.size()))
4549 ImportDecl(DC, StartLoc, Imported, IdentifierLocs);
4552 ImportDecl *ImportDecl::CreateImplicit(ASTContext &C, DeclContext *DC,
4553 SourceLocation StartLoc,
4555 SourceLocation EndLoc) {
4556 ImportDecl *Import = new (C, DC, additionalSizeToAlloc<SourceLocation>(1))
4557 ImportDecl(DC, StartLoc, Imported, EndLoc);
4558 Import->setImplicit();
4562 ImportDecl *ImportDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4563 unsigned NumLocations) {
4564 return new (C, ID, additionalSizeToAlloc<SourceLocation>(NumLocations))
4565 ImportDecl(EmptyShell());
4568 ArrayRef<SourceLocation> ImportDecl::getIdentifierLocs() const {
4569 if (!ImportedAndComplete.getInt())
4572 const auto *StoredLocs = getTrailingObjects<SourceLocation>();
4573 return llvm::makeArrayRef(StoredLocs,
4574 getNumModuleIdentifiers(getImportedModule()));
4577 SourceRange ImportDecl::getSourceRange() const {
4578 if (!ImportedAndComplete.getInt())
4579 return SourceRange(getLocation(), *getTrailingObjects<SourceLocation>());
4581 return SourceRange(getLocation(), getIdentifierLocs().back());
4584 //===----------------------------------------------------------------------===//
4585 // ExportDecl Implementation
4586 //===----------------------------------------------------------------------===//
4588 void ExportDecl::anchor() {}
4590 ExportDecl *ExportDecl::Create(ASTContext &C, DeclContext *DC,
4591 SourceLocation ExportLoc) {
4592 return new (C, DC) ExportDecl(DC, ExportLoc);
4595 ExportDecl *ExportDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4596 return new (C, ID) ExportDecl(nullptr, SourceLocation());