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/ASTDiagnostic.h"
18 #include "clang/AST/ASTLambda.h"
19 #include "clang/AST/ASTMutationListener.h"
20 #include "clang/AST/CanonicalType.h"
21 #include "clang/AST/DeclBase.h"
22 #include "clang/AST/DeclCXX.h"
23 #include "clang/AST/DeclObjC.h"
24 #include "clang/AST/DeclOpenMP.h"
25 #include "clang/AST/DeclTemplate.h"
26 #include "clang/AST/DeclarationName.h"
27 #include "clang/AST/Expr.h"
28 #include "clang/AST/ExprCXX.h"
29 #include "clang/AST/ExternalASTSource.h"
30 #include "clang/AST/ODRHash.h"
31 #include "clang/AST/PrettyDeclStackTrace.h"
32 #include "clang/AST/PrettyPrinter.h"
33 #include "clang/AST/Redeclarable.h"
34 #include "clang/AST/Stmt.h"
35 #include "clang/AST/TemplateBase.h"
36 #include "clang/AST/Type.h"
37 #include "clang/AST/TypeLoc.h"
38 #include "clang/Basic/Builtins.h"
39 #include "clang/Basic/IdentifierTable.h"
40 #include "clang/Basic/LLVM.h"
41 #include "clang/Basic/LangOptions.h"
42 #include "clang/Basic/Linkage.h"
43 #include "clang/Basic/Module.h"
44 #include "clang/Basic/PartialDiagnostic.h"
45 #include "clang/Basic/SanitizerBlacklist.h"
46 #include "clang/Basic/Sanitizers.h"
47 #include "clang/Basic/SourceLocation.h"
48 #include "clang/Basic/SourceManager.h"
49 #include "clang/Basic/Specifiers.h"
50 #include "clang/Basic/TargetCXXABI.h"
51 #include "clang/Basic/TargetInfo.h"
52 #include "clang/Basic/Visibility.h"
53 #include "llvm/ADT/APSInt.h"
54 #include "llvm/ADT/ArrayRef.h"
55 #include "llvm/ADT/None.h"
56 #include "llvm/ADT/Optional.h"
57 #include "llvm/ADT/STLExtras.h"
58 #include "llvm/ADT/SmallVector.h"
59 #include "llvm/ADT/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, /*visibilityExplicit=*/false);
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, /*visibilityExplicit=*/false);
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 // If a function is hidden by -fvisibility-inlines-hidden option and
1266 // is not explicitly attributed as a hidden function,
1267 // we should not make static local variables in the function hidden.
1268 LV = getLVForDecl(FD, computation);
1269 if (isa<VarDecl>(D) && useInlineVisibilityHidden(FD) &&
1270 !LV.isVisibilityExplicit()) {
1271 assert(cast<VarDecl>(D)->isStaticLocal());
1272 // If this was an implicitly hidden inline method, check again for
1273 // explicit visibility on the parent class, and use that for static locals
1275 if (const auto *MD = dyn_cast<CXXMethodDecl>(FD))
1276 LV = getLVForDecl(MD->getParent(), computation);
1277 if (!LV.isVisibilityExplicit()) {
1278 Visibility globalVisibility =
1279 computation.isValueVisibility()
1280 ? Context.getLangOpts().getValueVisibilityMode()
1281 : Context.getLangOpts().getTypeVisibilityMode();
1282 return LinkageInfo(VisibleNoLinkage, globalVisibility,
1283 /*visibilityExplicit=*/false);
1287 if (!isExternallyVisible(LV.getLinkage()))
1288 return LinkageInfo::none();
1289 return LinkageInfo(VisibleNoLinkage, LV.getVisibility(),
1290 LV.isVisibilityExplicit());
1293 static inline const CXXRecordDecl*
1294 getOutermostEnclosingLambda(const CXXRecordDecl *Record) {
1295 const CXXRecordDecl *Ret = Record;
1296 while (Record && Record->isLambda()) {
1298 if (!Record->getParent()) break;
1299 // Get the Containing Class of this Lambda Class
1300 Record = dyn_cast_or_null<CXXRecordDecl>(
1301 Record->getParent()->getParent());
1306 LinkageInfo LinkageComputer::computeLVForDecl(const NamedDecl *D,
1307 LVComputationKind computation,
1308 bool IgnoreVarTypeLinkage) {
1309 // Internal_linkage attribute overrides other considerations.
1310 if (D->hasAttr<InternalLinkageAttr>())
1311 return getInternalLinkageFor(D);
1313 // Objective-C: treat all Objective-C declarations as having external
1315 switch (D->getKind()) {
1319 // Per C++ [basic.link]p2, only the names of objects, references,
1320 // functions, types, templates, namespaces, and values ever have linkage.
1322 // Note that the name of a typedef, namespace alias, using declaration,
1323 // and so on are not the name of the corresponding type, namespace, or
1324 // declaration, so they do *not* have linkage.
1325 case Decl::ImplicitParam:
1327 case Decl::NamespaceAlias:
1330 case Decl::UsingShadow:
1331 case Decl::UsingDirective:
1332 return LinkageInfo::none();
1334 case Decl::EnumConstant:
1335 // C++ [basic.link]p4: an enumerator has the linkage of its enumeration.
1336 if (D->getASTContext().getLangOpts().CPlusPlus)
1337 return getLVForDecl(cast<EnumDecl>(D->getDeclContext()), computation);
1338 return LinkageInfo::visible_none();
1341 case Decl::TypeAlias:
1342 // A typedef declaration has linkage if it gives a type a name for
1343 // linkage purposes.
1344 if (!cast<TypedefNameDecl>(D)
1345 ->getAnonDeclWithTypedefName(/*AnyRedecl*/true))
1346 return LinkageInfo::none();
1349 case Decl::TemplateTemplateParm: // count these as external
1350 case Decl::NonTypeTemplateParm:
1351 case Decl::ObjCAtDefsField:
1352 case Decl::ObjCCategory:
1353 case Decl::ObjCCategoryImpl:
1354 case Decl::ObjCCompatibleAlias:
1355 case Decl::ObjCImplementation:
1356 case Decl::ObjCMethod:
1357 case Decl::ObjCProperty:
1358 case Decl::ObjCPropertyImpl:
1359 case Decl::ObjCProtocol:
1360 return getExternalLinkageFor(D);
1362 case Decl::CXXRecord: {
1363 const auto *Record = cast<CXXRecordDecl>(D);
1364 if (Record->isLambda()) {
1365 if (!Record->getLambdaManglingNumber()) {
1366 // This lambda has no mangling number, so it's internal.
1367 return getInternalLinkageFor(D);
1370 // This lambda has its linkage/visibility determined:
1371 // - either by the outermost lambda if that lambda has no mangling
1373 // - or by the parent of the outer most lambda
1374 // This prevents infinite recursion in settings such as nested lambdas
1375 // used in NSDMI's, for e.g.
1378 // int t2 = ([](int a) { return [](int b) { return b; };})(t)(t);
1380 const CXXRecordDecl *OuterMostLambda =
1381 getOutermostEnclosingLambda(Record);
1382 if (!OuterMostLambda->getLambdaManglingNumber())
1383 return getInternalLinkageFor(D);
1385 return getLVForClosure(
1386 OuterMostLambda->getDeclContext()->getRedeclContext(),
1387 OuterMostLambda->getLambdaContextDecl(), computation);
1394 // Handle linkage for namespace-scope names.
1395 if (D->getDeclContext()->getRedeclContext()->isFileContext())
1396 return getLVForNamespaceScopeDecl(D, computation, IgnoreVarTypeLinkage);
1398 // C++ [basic.link]p5:
1399 // In addition, a member function, static data member, a named
1400 // class or enumeration of class scope, or an unnamed class or
1401 // enumeration defined in a class-scope typedef declaration such
1402 // that the class or enumeration has the typedef name for linkage
1403 // purposes (7.1.3), has external linkage if the name of the class
1404 // has external linkage.
1405 if (D->getDeclContext()->isRecord())
1406 return getLVForClassMember(D, computation, IgnoreVarTypeLinkage);
1408 // C++ [basic.link]p6:
1409 // The name of a function declared in block scope and the name of
1410 // an object declared by a block scope extern declaration have
1411 // linkage. If there is a visible declaration of an entity with
1412 // linkage having the same name and type, ignoring entities
1413 // declared outside the innermost enclosing namespace scope, the
1414 // block scope declaration declares that same entity and receives
1415 // the linkage of the previous declaration. If there is more than
1416 // one such matching entity, the program is ill-formed. Otherwise,
1417 // if no matching entity is found, the block scope entity receives
1418 // external linkage.
1419 if (D->getDeclContext()->isFunctionOrMethod())
1420 return getLVForLocalDecl(D, computation);
1422 // C++ [basic.link]p6:
1423 // Names not covered by these rules have no linkage.
1424 return LinkageInfo::none();
1427 /// getLVForDecl - Get the linkage and visibility for the given declaration.
1428 LinkageInfo LinkageComputer::getLVForDecl(const NamedDecl *D,
1429 LVComputationKind computation) {
1430 // Internal_linkage attribute overrides other considerations.
1431 if (D->hasAttr<InternalLinkageAttr>())
1432 return getInternalLinkageFor(D);
1434 if (computation.IgnoreAllVisibility && D->hasCachedLinkage())
1435 return LinkageInfo(D->getCachedLinkage(), DefaultVisibility, false);
1437 if (llvm::Optional<LinkageInfo> LI = lookup(D, computation))
1440 LinkageInfo LV = computeLVForDecl(D, computation);
1441 if (D->hasCachedLinkage())
1442 assert(D->getCachedLinkage() == LV.getLinkage());
1444 D->setCachedLinkage(LV.getLinkage());
1445 cache(D, computation, LV);
1448 // In C (because of gnu inline) and in c++ with microsoft extensions an
1449 // static can follow an extern, so we can have two decls with different
1451 const LangOptions &Opts = D->getASTContext().getLangOpts();
1452 if (!Opts.CPlusPlus || Opts.MicrosoftExt)
1455 // We have just computed the linkage for this decl. By induction we know
1456 // that all other computed linkages match, check that the one we just
1457 // computed also does.
1458 NamedDecl *Old = nullptr;
1459 for (auto I : D->redecls()) {
1460 auto *T = cast<NamedDecl>(I);
1463 if (!T->isInvalidDecl() && T->hasCachedLinkage()) {
1468 assert(!Old || Old->getCachedLinkage() == D->getCachedLinkage());
1474 LinkageInfo LinkageComputer::getDeclLinkageAndVisibility(const NamedDecl *D) {
1475 return getLVForDecl(D,
1476 LVComputationKind(usesTypeVisibility(D)
1477 ? NamedDecl::VisibilityForType
1478 : NamedDecl::VisibilityForValue));
1481 Module *Decl::getOwningModuleForLinkage(bool IgnoreLinkage) const {
1482 Module *M = getOwningModule();
1487 case Module::ModuleMapModule:
1488 // Module map modules have no special linkage semantics.
1491 case Module::ModuleInterfaceUnit:
1494 case Module::GlobalModuleFragment: {
1495 // External linkage declarations in the global module have no owning module
1496 // for linkage purposes. But internal linkage declarations in the global
1497 // module fragment of a particular module are owned by that module for
1498 // linkage purposes.
1501 bool InternalLinkage;
1502 if (auto *ND = dyn_cast<NamedDecl>(this))
1503 InternalLinkage = !ND->hasExternalFormalLinkage();
1505 auto *NSD = dyn_cast<NamespaceDecl>(this);
1506 InternalLinkage = (NSD && NSD->isAnonymousNamespace()) ||
1507 isInAnonymousNamespace();
1509 return InternalLinkage ? M->Parent : nullptr;
1513 llvm_unreachable("unknown module kind");
1516 void NamedDecl::printName(raw_ostream &os) const {
1520 std::string NamedDecl::getQualifiedNameAsString() const {
1521 std::string QualName;
1522 llvm::raw_string_ostream OS(QualName);
1523 printQualifiedName(OS, getASTContext().getPrintingPolicy());
1527 void NamedDecl::printQualifiedName(raw_ostream &OS) const {
1528 printQualifiedName(OS, getASTContext().getPrintingPolicy());
1531 void NamedDecl::printQualifiedName(raw_ostream &OS,
1532 const PrintingPolicy &P) const {
1533 const DeclContext *Ctx = getDeclContext();
1535 // For ObjC methods, look through categories and use the interface as context.
1536 if (auto *MD = dyn_cast<ObjCMethodDecl>(this))
1537 if (auto *ID = MD->getClassInterface())
1540 if (Ctx->isFunctionOrMethod()) {
1545 using ContextsTy = SmallVector<const DeclContext *, 8>;
1546 ContextsTy Contexts;
1548 // Collect named contexts.
1550 if (isa<NamedDecl>(Ctx))
1551 Contexts.push_back(Ctx);
1552 Ctx = Ctx->getParent();
1555 for (const DeclContext *DC : llvm::reverse(Contexts)) {
1556 if (const auto *Spec = dyn_cast<ClassTemplateSpecializationDecl>(DC)) {
1557 OS << Spec->getName();
1558 const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs();
1559 printTemplateArgumentList(OS, TemplateArgs.asArray(), P);
1560 } else if (const auto *ND = dyn_cast<NamespaceDecl>(DC)) {
1561 if (P.SuppressUnwrittenScope &&
1562 (ND->isAnonymousNamespace() || ND->isInline()))
1564 if (ND->isAnonymousNamespace()) {
1565 OS << (P.MSVCFormatting ? "`anonymous namespace\'"
1566 : "(anonymous namespace)");
1570 } else if (const auto *RD = dyn_cast<RecordDecl>(DC)) {
1571 if (!RD->getIdentifier())
1572 OS << "(anonymous " << RD->getKindName() << ')';
1575 } else if (const auto *FD = dyn_cast<FunctionDecl>(DC)) {
1576 const FunctionProtoType *FT = nullptr;
1577 if (FD->hasWrittenPrototype())
1578 FT = dyn_cast<FunctionProtoType>(FD->getType()->castAs<FunctionType>());
1582 unsigned NumParams = FD->getNumParams();
1583 for (unsigned i = 0; i < NumParams; ++i) {
1586 OS << FD->getParamDecl(i)->getType().stream(P);
1589 if (FT->isVariadic()) {
1596 } else if (const auto *ED = dyn_cast<EnumDecl>(DC)) {
1597 // C++ [dcl.enum]p10: Each enum-name and each unscoped
1598 // enumerator is declared in the scope that immediately contains
1599 // the enum-specifier. Each scoped enumerator is declared in the
1600 // scope of the enumeration.
1601 // For the case of unscoped enumerator, do not include in the qualified
1602 // name any information about its enum enclosing scope, as its visibility
1609 OS << *cast<NamedDecl>(DC);
1614 if (getDeclName() || isa<DecompositionDecl>(this))
1617 OS << "(anonymous)";
1620 void NamedDecl::getNameForDiagnostic(raw_ostream &OS,
1621 const PrintingPolicy &Policy,
1622 bool Qualified) const {
1624 printQualifiedName(OS, Policy);
1629 template<typename T> static bool isRedeclarableImpl(Redeclarable<T> *) {
1632 static bool isRedeclarableImpl(...) { return false; }
1633 static bool isRedeclarable(Decl::Kind K) {
1635 #define DECL(Type, Base) \
1637 return isRedeclarableImpl((Type##Decl *)nullptr);
1638 #define ABSTRACT_DECL(DECL)
1639 #include "clang/AST/DeclNodes.inc"
1641 llvm_unreachable("unknown decl kind");
1644 bool NamedDecl::declarationReplaces(NamedDecl *OldD, bool IsKnownNewer) const {
1645 assert(getDeclName() == OldD->getDeclName() && "Declaration name mismatch");
1647 // Never replace one imported declaration with another; we need both results
1648 // when re-exporting.
1649 if (OldD->isFromASTFile() && isFromASTFile())
1652 // A kind mismatch implies that the declaration is not replaced.
1653 if (OldD->getKind() != getKind())
1656 // For method declarations, we never replace. (Why?)
1657 if (isa<ObjCMethodDecl>(this))
1660 // For parameters, pick the newer one. This is either an error or (in
1661 // Objective-C) permitted as an extension.
1662 if (isa<ParmVarDecl>(this))
1665 // Inline namespaces can give us two declarations with the same
1666 // name and kind in the same scope but different contexts; we should
1667 // keep both declarations in this case.
1668 if (!this->getDeclContext()->getRedeclContext()->Equals(
1669 OldD->getDeclContext()->getRedeclContext()))
1672 // Using declarations can be replaced if they import the same name from the
1674 if (auto *UD = dyn_cast<UsingDecl>(this)) {
1675 ASTContext &Context = getASTContext();
1676 return Context.getCanonicalNestedNameSpecifier(UD->getQualifier()) ==
1677 Context.getCanonicalNestedNameSpecifier(
1678 cast<UsingDecl>(OldD)->getQualifier());
1680 if (auto *UUVD = dyn_cast<UnresolvedUsingValueDecl>(this)) {
1681 ASTContext &Context = getASTContext();
1682 return Context.getCanonicalNestedNameSpecifier(UUVD->getQualifier()) ==
1683 Context.getCanonicalNestedNameSpecifier(
1684 cast<UnresolvedUsingValueDecl>(OldD)->getQualifier());
1687 if (isRedeclarable(getKind())) {
1688 if (getCanonicalDecl() != OldD->getCanonicalDecl())
1694 // Check whether this is actually newer than OldD. We want to keep the
1695 // newer declaration. This loop will usually only iterate once, because
1696 // OldD is usually the previous declaration.
1697 for (auto D : redecls()) {
1701 // If we reach the canonical declaration, then OldD is not actually older
1704 // FIXME: In this case, we should not add this decl to the lookup table.
1705 if (D->isCanonicalDecl())
1709 // It's a newer declaration of the same kind of declaration in the same
1710 // scope: we want this decl instead of the existing one.
1714 // In all other cases, we need to keep both declarations in case they have
1715 // different visibility. Any attempt to use the name will result in an
1716 // ambiguity if more than one is visible.
1720 bool NamedDecl::hasLinkage() const {
1721 return getFormalLinkage() != NoLinkage;
1724 NamedDecl *NamedDecl::getUnderlyingDeclImpl() {
1725 NamedDecl *ND = this;
1726 while (auto *UD = dyn_cast<UsingShadowDecl>(ND))
1727 ND = UD->getTargetDecl();
1729 if (auto *AD = dyn_cast<ObjCCompatibleAliasDecl>(ND))
1730 return AD->getClassInterface();
1732 if (auto *AD = dyn_cast<NamespaceAliasDecl>(ND))
1733 return AD->getNamespace();
1738 bool NamedDecl::isCXXInstanceMember() const {
1739 if (!isCXXClassMember())
1742 const NamedDecl *D = this;
1743 if (isa<UsingShadowDecl>(D))
1744 D = cast<UsingShadowDecl>(D)->getTargetDecl();
1746 if (isa<FieldDecl>(D) || isa<IndirectFieldDecl>(D) || isa<MSPropertyDecl>(D))
1748 if (const auto *MD = dyn_cast_or_null<CXXMethodDecl>(D->getAsFunction()))
1749 return MD->isInstance();
1753 //===----------------------------------------------------------------------===//
1754 // DeclaratorDecl Implementation
1755 //===----------------------------------------------------------------------===//
1757 template <typename DeclT>
1758 static SourceLocation getTemplateOrInnerLocStart(const DeclT *decl) {
1759 if (decl->getNumTemplateParameterLists() > 0)
1760 return decl->getTemplateParameterList(0)->getTemplateLoc();
1762 return decl->getInnerLocStart();
1765 SourceLocation DeclaratorDecl::getTypeSpecStartLoc() const {
1766 TypeSourceInfo *TSI = getTypeSourceInfo();
1767 if (TSI) return TSI->getTypeLoc().getBeginLoc();
1768 return SourceLocation();
1771 void DeclaratorDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) {
1773 // Make sure the extended decl info is allocated.
1774 if (!hasExtInfo()) {
1775 // Save (non-extended) type source info pointer.
1776 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
1777 // Allocate external info struct.
1778 DeclInfo = new (getASTContext()) ExtInfo;
1779 // Restore savedTInfo into (extended) decl info.
1780 getExtInfo()->TInfo = savedTInfo;
1782 // Set qualifier info.
1783 getExtInfo()->QualifierLoc = QualifierLoc;
1785 // Here Qualifier == 0, i.e., we are removing the qualifier (if any).
1787 if (getExtInfo()->NumTemplParamLists == 0) {
1788 // Save type source info pointer.
1789 TypeSourceInfo *savedTInfo = getExtInfo()->TInfo;
1790 // Deallocate the extended decl info.
1791 getASTContext().Deallocate(getExtInfo());
1792 // Restore savedTInfo into (non-extended) decl info.
1793 DeclInfo = savedTInfo;
1796 getExtInfo()->QualifierLoc = QualifierLoc;
1801 void DeclaratorDecl::setTemplateParameterListsInfo(
1802 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
1803 assert(!TPLists.empty());
1804 // Make sure the extended decl info is allocated.
1805 if (!hasExtInfo()) {
1806 // Save (non-extended) type source info pointer.
1807 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
1808 // Allocate external info struct.
1809 DeclInfo = new (getASTContext()) ExtInfo;
1810 // Restore savedTInfo into (extended) decl info.
1811 getExtInfo()->TInfo = savedTInfo;
1813 // Set the template parameter lists info.
1814 getExtInfo()->setTemplateParameterListsInfo(Context, TPLists);
1817 SourceLocation DeclaratorDecl::getOuterLocStart() const {
1818 return getTemplateOrInnerLocStart(this);
1821 // Helper function: returns true if QT is or contains a type
1822 // having a postfix component.
1823 static bool typeIsPostfix(QualType QT) {
1825 const Type* T = QT.getTypePtr();
1826 switch (T->getTypeClass()) {
1830 QT = cast<PointerType>(T)->getPointeeType();
1832 case Type::BlockPointer:
1833 QT = cast<BlockPointerType>(T)->getPointeeType();
1835 case Type::MemberPointer:
1836 QT = cast<MemberPointerType>(T)->getPointeeType();
1838 case Type::LValueReference:
1839 case Type::RValueReference:
1840 QT = cast<ReferenceType>(T)->getPointeeType();
1842 case Type::PackExpansion:
1843 QT = cast<PackExpansionType>(T)->getPattern();
1846 case Type::ConstantArray:
1847 case Type::DependentSizedArray:
1848 case Type::IncompleteArray:
1849 case Type::VariableArray:
1850 case Type::FunctionProto:
1851 case Type::FunctionNoProto:
1857 SourceRange DeclaratorDecl::getSourceRange() const {
1858 SourceLocation RangeEnd = getLocation();
1859 if (TypeSourceInfo *TInfo = getTypeSourceInfo()) {
1860 // If the declaration has no name or the type extends past the name take the
1861 // end location of the type.
1862 if (!getDeclName() || typeIsPostfix(TInfo->getType()))
1863 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
1865 return SourceRange(getOuterLocStart(), RangeEnd);
1868 void QualifierInfo::setTemplateParameterListsInfo(
1869 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
1870 // Free previous template parameters (if any).
1871 if (NumTemplParamLists > 0) {
1872 Context.Deallocate(TemplParamLists);
1873 TemplParamLists = nullptr;
1874 NumTemplParamLists = 0;
1876 // Set info on matched template parameter lists (if any).
1877 if (!TPLists.empty()) {
1878 TemplParamLists = new (Context) TemplateParameterList *[TPLists.size()];
1879 NumTemplParamLists = TPLists.size();
1880 std::copy(TPLists.begin(), TPLists.end(), TemplParamLists);
1884 //===----------------------------------------------------------------------===//
1885 // VarDecl Implementation
1886 //===----------------------------------------------------------------------===//
1888 const char *VarDecl::getStorageClassSpecifierString(StorageClass SC) {
1890 case SC_None: break;
1891 case SC_Auto: return "auto";
1892 case SC_Extern: return "extern";
1893 case SC_PrivateExtern: return "__private_extern__";
1894 case SC_Register: return "register";
1895 case SC_Static: return "static";
1898 llvm_unreachable("Invalid storage class");
1901 VarDecl::VarDecl(Kind DK, ASTContext &C, DeclContext *DC,
1902 SourceLocation StartLoc, SourceLocation IdLoc,
1903 IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo,
1905 : DeclaratorDecl(DK, DC, IdLoc, Id, T, TInfo, StartLoc),
1906 redeclarable_base(C) {
1907 static_assert(sizeof(VarDeclBitfields) <= sizeof(unsigned),
1908 "VarDeclBitfields too large!");
1909 static_assert(sizeof(ParmVarDeclBitfields) <= sizeof(unsigned),
1910 "ParmVarDeclBitfields too large!");
1911 static_assert(sizeof(NonParmVarDeclBitfields) <= sizeof(unsigned),
1912 "NonParmVarDeclBitfields too large!");
1914 VarDeclBits.SClass = SC;
1915 // Everything else is implicitly initialized to false.
1918 VarDecl *VarDecl::Create(ASTContext &C, DeclContext *DC,
1919 SourceLocation StartL, SourceLocation IdL,
1920 IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo,
1922 return new (C, DC) VarDecl(Var, C, DC, StartL, IdL, Id, T, TInfo, S);
1925 VarDecl *VarDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
1927 VarDecl(Var, C, nullptr, SourceLocation(), SourceLocation(), nullptr,
1928 QualType(), nullptr, SC_None);
1931 void VarDecl::setStorageClass(StorageClass SC) {
1932 assert(isLegalForVariable(SC));
1933 VarDeclBits.SClass = SC;
1936 VarDecl::TLSKind VarDecl::getTLSKind() const {
1937 switch (VarDeclBits.TSCSpec) {
1938 case TSCS_unspecified:
1939 if (!hasAttr<ThreadAttr>() &&
1940 !(getASTContext().getLangOpts().OpenMPUseTLS &&
1941 getASTContext().getTargetInfo().isTLSSupported() &&
1942 hasAttr<OMPThreadPrivateDeclAttr>()))
1944 return ((getASTContext().getLangOpts().isCompatibleWithMSVC(
1945 LangOptions::MSVC2015)) ||
1946 hasAttr<OMPThreadPrivateDeclAttr>())
1949 case TSCS___thread: // Fall through.
1950 case TSCS__Thread_local:
1952 case TSCS_thread_local:
1955 llvm_unreachable("Unknown thread storage class specifier!");
1958 SourceRange VarDecl::getSourceRange() const {
1959 if (const Expr *Init = getInit()) {
1960 SourceLocation InitEnd = Init->getEndLoc();
1961 // If Init is implicit, ignore its source range and fallback on
1962 // DeclaratorDecl::getSourceRange() to handle postfix elements.
1963 if (InitEnd.isValid() && InitEnd != getLocation())
1964 return SourceRange(getOuterLocStart(), InitEnd);
1966 return DeclaratorDecl::getSourceRange();
1969 template<typename T>
1970 static LanguageLinkage getDeclLanguageLinkage(const T &D) {
1971 // C++ [dcl.link]p1: All function types, function names with external linkage,
1972 // and variable names with external linkage have a language linkage.
1973 if (!D.hasExternalFormalLinkage())
1974 return NoLanguageLinkage;
1976 // Language linkage is a C++ concept, but saying that everything else in C has
1977 // C language linkage fits the implementation nicely.
1978 ASTContext &Context = D.getASTContext();
1979 if (!Context.getLangOpts().CPlusPlus)
1980 return CLanguageLinkage;
1982 // C++ [dcl.link]p4: A C language linkage is ignored in determining the
1983 // language linkage of the names of class members and the function type of
1984 // class member functions.
1985 const DeclContext *DC = D.getDeclContext();
1987 return CXXLanguageLinkage;
1989 // If the first decl is in an extern "C" context, any other redeclaration
1990 // will have C language linkage. If the first one is not in an extern "C"
1991 // context, we would have reported an error for any other decl being in one.
1992 if (isFirstInExternCContext(&D))
1993 return CLanguageLinkage;
1994 return CXXLanguageLinkage;
1997 template<typename T>
1998 static bool isDeclExternC(const T &D) {
1999 // Since the context is ignored for class members, they can only have C++
2000 // language linkage or no language linkage.
2001 const DeclContext *DC = D.getDeclContext();
2002 if (DC->isRecord()) {
2003 assert(D.getASTContext().getLangOpts().CPlusPlus);
2007 return D.getLanguageLinkage() == CLanguageLinkage;
2010 LanguageLinkage VarDecl::getLanguageLinkage() const {
2011 return getDeclLanguageLinkage(*this);
2014 bool VarDecl::isExternC() const {
2015 return isDeclExternC(*this);
2018 bool VarDecl::isInExternCContext() const {
2019 return getLexicalDeclContext()->isExternCContext();
2022 bool VarDecl::isInExternCXXContext() const {
2023 return getLexicalDeclContext()->isExternCXXContext();
2026 VarDecl *VarDecl::getCanonicalDecl() { return getFirstDecl(); }
2028 VarDecl::DefinitionKind
2029 VarDecl::isThisDeclarationADefinition(ASTContext &C) const {
2030 if (isThisDeclarationADemotedDefinition())
2031 return DeclarationOnly;
2033 // C++ [basic.def]p2:
2034 // A declaration is a definition unless [...] it contains the 'extern'
2035 // specifier or a linkage-specification and neither an initializer [...],
2036 // it declares a non-inline static data member in a class declaration [...],
2037 // it declares a static data member outside a class definition and the variable
2038 // was defined within the class with the constexpr specifier [...],
2039 // C++1y [temp.expl.spec]p15:
2040 // An explicit specialization of a static data member or an explicit
2041 // specialization of a static data member template is a definition if the
2042 // declaration includes an initializer; otherwise, it is a declaration.
2044 // FIXME: How do you declare (but not define) a partial specialization of
2045 // a static data member template outside the containing class?
2046 if (isStaticDataMember()) {
2047 if (isOutOfLine() &&
2048 !(getCanonicalDecl()->isInline() &&
2049 getCanonicalDecl()->isConstexpr()) &&
2051 // If the first declaration is out-of-line, this may be an
2052 // instantiation of an out-of-line partial specialization of a variable
2053 // template for which we have not yet instantiated the initializer.
2054 (getFirstDecl()->isOutOfLine()
2055 ? getTemplateSpecializationKind() == TSK_Undeclared
2056 : getTemplateSpecializationKind() !=
2057 TSK_ExplicitSpecialization) ||
2058 isa<VarTemplatePartialSpecializationDecl>(this)))
2060 else if (!isOutOfLine() && isInline())
2063 return DeclarationOnly;
2066 // A definition of an identifier is a declaration for that identifier that
2067 // [...] causes storage to be reserved for that object.
2068 // Note: that applies for all non-file-scope objects.
2070 // If the declaration of an identifier for an object has file scope and an
2071 // initializer, the declaration is an external definition for the identifier
2075 if (hasDefiningAttr())
2078 if (const auto *SAA = getAttr<SelectAnyAttr>())
2079 if (!SAA->isInherited())
2082 // A variable template specialization (other than a static data member
2083 // template or an explicit specialization) is a declaration until we
2084 // instantiate its initializer.
2085 if (auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(this)) {
2086 if (VTSD->getTemplateSpecializationKind() != TSK_ExplicitSpecialization &&
2087 !isa<VarTemplatePartialSpecializationDecl>(VTSD) &&
2088 !VTSD->IsCompleteDefinition)
2089 return DeclarationOnly;
2092 if (hasExternalStorage())
2093 return DeclarationOnly;
2096 // A declaration directly contained in a linkage-specification is treated
2097 // as if it contains the extern specifier for the purpose of determining
2098 // the linkage of the declared name and whether it is a definition.
2099 if (isSingleLineLanguageLinkage(*this))
2100 return DeclarationOnly;
2103 // A declaration of an object that has file scope without an initializer,
2104 // and without a storage class specifier or the scs 'static', constitutes
2105 // a tentative definition.
2106 // No such thing in C++.
2107 if (!C.getLangOpts().CPlusPlus && isFileVarDecl())
2108 return TentativeDefinition;
2110 // What's left is (in C, block-scope) declarations without initializers or
2111 // external storage. These are definitions.
2115 VarDecl *VarDecl::getActingDefinition() {
2116 DefinitionKind Kind = isThisDeclarationADefinition();
2117 if (Kind != TentativeDefinition)
2120 VarDecl *LastTentative = nullptr;
2121 VarDecl *First = getFirstDecl();
2122 for (auto I : First->redecls()) {
2123 Kind = I->isThisDeclarationADefinition();
2124 if (Kind == Definition)
2126 else if (Kind == TentativeDefinition)
2129 return LastTentative;
2132 VarDecl *VarDecl::getDefinition(ASTContext &C) {
2133 VarDecl *First = getFirstDecl();
2134 for (auto I : First->redecls()) {
2135 if (I->isThisDeclarationADefinition(C) == Definition)
2141 VarDecl::DefinitionKind VarDecl::hasDefinition(ASTContext &C) const {
2142 DefinitionKind Kind = DeclarationOnly;
2144 const VarDecl *First = getFirstDecl();
2145 for (auto I : First->redecls()) {
2146 Kind = std::max(Kind, I->isThisDeclarationADefinition(C));
2147 if (Kind == Definition)
2154 const Expr *VarDecl::getAnyInitializer(const VarDecl *&D) const {
2155 for (auto I : redecls()) {
2156 if (auto Expr = I->getInit()) {
2164 bool VarDecl::hasInit() const {
2165 if (auto *P = dyn_cast<ParmVarDecl>(this))
2166 if (P->hasUnparsedDefaultArg() || P->hasUninstantiatedDefaultArg())
2169 return !Init.isNull();
2172 Expr *VarDecl::getInit() {
2176 if (auto *S = Init.dyn_cast<Stmt *>())
2177 return cast<Expr>(S);
2179 return cast_or_null<Expr>(Init.get<EvaluatedStmt *>()->Value);
2182 Stmt **VarDecl::getInitAddress() {
2183 if (auto *ES = Init.dyn_cast<EvaluatedStmt *>())
2186 return Init.getAddrOfPtr1();
2189 bool VarDecl::isOutOfLine() const {
2190 if (Decl::isOutOfLine())
2193 if (!isStaticDataMember())
2196 // If this static data member was instantiated from a static data member of
2197 // a class template, check whether that static data member was defined
2199 if (VarDecl *VD = getInstantiatedFromStaticDataMember())
2200 return VD->isOutOfLine();
2205 void VarDecl::setInit(Expr *I) {
2206 if (auto *Eval = Init.dyn_cast<EvaluatedStmt *>()) {
2207 Eval->~EvaluatedStmt();
2208 getASTContext().Deallocate(Eval);
2214 bool VarDecl::isUsableInConstantExpressions(ASTContext &C) const {
2215 const LangOptions &Lang = C.getLangOpts();
2217 if (!Lang.CPlusPlus)
2220 // In C++11, any variable of reference type can be used in a constant
2221 // expression if it is initialized by a constant expression.
2222 if (Lang.CPlusPlus11 && getType()->isReferenceType())
2225 // Only const objects can be used in constant expressions in C++. C++98 does
2226 // not require the variable to be non-volatile, but we consider this to be a
2228 if (!getType().isConstQualified() || getType().isVolatileQualified())
2231 // In C++, const, non-volatile variables of integral or enumeration types
2232 // can be used in constant expressions.
2233 if (getType()->isIntegralOrEnumerationType())
2236 // Additionally, in C++11, non-volatile constexpr variables can be used in
2237 // constant expressions.
2238 return Lang.CPlusPlus11 && isConstexpr();
2241 /// Convert the initializer for this declaration to the elaborated EvaluatedStmt
2242 /// form, which contains extra information on the evaluated value of the
2244 EvaluatedStmt *VarDecl::ensureEvaluatedStmt() const {
2245 auto *Eval = Init.dyn_cast<EvaluatedStmt *>();
2247 // Note: EvaluatedStmt contains an APValue, which usually holds
2248 // resources not allocated from the ASTContext. We need to do some
2249 // work to avoid leaking those, but we do so in VarDecl::evaluateValue
2250 // where we can detect whether there's anything to clean up or not.
2251 Eval = new (getASTContext()) EvaluatedStmt;
2252 Eval->Value = Init.get<Stmt *>();
2258 APValue *VarDecl::evaluateValue() const {
2259 SmallVector<PartialDiagnosticAt, 8> Notes;
2260 return evaluateValue(Notes);
2263 APValue *VarDecl::evaluateValue(
2264 SmallVectorImpl<PartialDiagnosticAt> &Notes) const {
2265 EvaluatedStmt *Eval = ensureEvaluatedStmt();
2267 // We only produce notes indicating why an initializer is non-constant the
2268 // first time it is evaluated. FIXME: The notes won't always be emitted the
2269 // first time we try evaluation, so might not be produced at all.
2270 if (Eval->WasEvaluated)
2271 return Eval->Evaluated.isUninit() ? nullptr : &Eval->Evaluated;
2273 const auto *Init = cast<Expr>(Eval->Value);
2274 assert(!Init->isValueDependent());
2276 if (Eval->IsEvaluating) {
2277 // FIXME: Produce a diagnostic for self-initialization.
2278 Eval->CheckedICE = true;
2279 Eval->IsICE = false;
2283 Eval->IsEvaluating = true;
2285 bool Result = Init->EvaluateAsInitializer(Eval->Evaluated, getASTContext(),
2288 // Ensure the computed APValue is cleaned up later if evaluation succeeded,
2289 // or that it's empty (so that there's nothing to clean up) if evaluation
2292 Eval->Evaluated = APValue();
2293 else if (Eval->Evaluated.needsCleanup())
2294 getASTContext().addDestruction(&Eval->Evaluated);
2296 Eval->IsEvaluating = false;
2297 Eval->WasEvaluated = true;
2299 // In C++11, we have determined whether the initializer was a constant
2300 // expression as a side-effect.
2301 if (getASTContext().getLangOpts().CPlusPlus11 && !Eval->CheckedICE) {
2302 Eval->CheckedICE = true;
2303 Eval->IsICE = Result && Notes.empty();
2306 return Result ? &Eval->Evaluated : nullptr;
2309 APValue *VarDecl::getEvaluatedValue() const {
2310 if (EvaluatedStmt *Eval = Init.dyn_cast<EvaluatedStmt *>())
2311 if (Eval->WasEvaluated)
2312 return &Eval->Evaluated;
2317 bool VarDecl::isInitKnownICE() const {
2318 if (EvaluatedStmt *Eval = Init.dyn_cast<EvaluatedStmt *>())
2319 return Eval->CheckedICE;
2324 bool VarDecl::isInitICE() const {
2325 assert(isInitKnownICE() &&
2326 "Check whether we already know that the initializer is an ICE");
2327 return Init.get<EvaluatedStmt *>()->IsICE;
2330 bool VarDecl::checkInitIsICE() const {
2331 // Initializers of weak variables are never ICEs.
2335 EvaluatedStmt *Eval = ensureEvaluatedStmt();
2336 if (Eval->CheckedICE)
2337 // We have already checked whether this subexpression is an
2338 // integral constant expression.
2341 const auto *Init = cast<Expr>(Eval->Value);
2342 assert(!Init->isValueDependent());
2344 // In C++11, evaluate the initializer to check whether it's a constant
2346 if (getASTContext().getLangOpts().CPlusPlus11) {
2347 SmallVector<PartialDiagnosticAt, 8> Notes;
2348 evaluateValue(Notes);
2352 // It's an ICE whether or not the definition we found is
2353 // out-of-line. See DR 721 and the discussion in Clang PR
2354 // 6206 for details.
2356 if (Eval->CheckingICE)
2358 Eval->CheckingICE = true;
2360 Eval->IsICE = Init->isIntegerConstantExpr(getASTContext());
2361 Eval->CheckingICE = false;
2362 Eval->CheckedICE = true;
2366 template<typename DeclT>
2367 static DeclT *getDefinitionOrSelf(DeclT *D) {
2369 if (auto *Def = D->getDefinition())
2374 bool VarDecl::isEscapingByref() const {
2375 return hasAttr<BlocksAttr>() && NonParmVarDeclBits.EscapingByref;
2378 bool VarDecl::isNonEscapingByref() const {
2379 return hasAttr<BlocksAttr>() && !NonParmVarDeclBits.EscapingByref;
2382 VarDecl *VarDecl::getTemplateInstantiationPattern() const {
2383 // If it's a variable template specialization, find the template or partial
2384 // specialization from which it was instantiated.
2385 if (auto *VDTemplSpec = dyn_cast<VarTemplateSpecializationDecl>(this)) {
2386 auto From = VDTemplSpec->getInstantiatedFrom();
2387 if (auto *VTD = From.dyn_cast<VarTemplateDecl *>()) {
2388 while (auto *NewVTD = VTD->getInstantiatedFromMemberTemplate()) {
2389 if (NewVTD->isMemberSpecialization())
2393 return getDefinitionOrSelf(VTD->getTemplatedDecl());
2396 From.dyn_cast<VarTemplatePartialSpecializationDecl *>()) {
2397 while (auto *NewVTPSD = VTPSD->getInstantiatedFromMember()) {
2398 if (NewVTPSD->isMemberSpecialization())
2402 return getDefinitionOrSelf<VarDecl>(VTPSD);
2406 if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo()) {
2407 if (isTemplateInstantiation(MSInfo->getTemplateSpecializationKind())) {
2408 VarDecl *VD = getInstantiatedFromStaticDataMember();
2409 while (auto *NewVD = VD->getInstantiatedFromStaticDataMember())
2411 return getDefinitionOrSelf(VD);
2415 if (VarTemplateDecl *VarTemplate = getDescribedVarTemplate()) {
2416 while (VarTemplate->getInstantiatedFromMemberTemplate()) {
2417 if (VarTemplate->isMemberSpecialization())
2419 VarTemplate = VarTemplate->getInstantiatedFromMemberTemplate();
2422 return getDefinitionOrSelf(VarTemplate->getTemplatedDecl());
2427 VarDecl *VarDecl::getInstantiatedFromStaticDataMember() const {
2428 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2429 return cast<VarDecl>(MSI->getInstantiatedFrom());
2434 TemplateSpecializationKind VarDecl::getTemplateSpecializationKind() const {
2435 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
2436 return Spec->getSpecializationKind();
2438 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2439 return MSI->getTemplateSpecializationKind();
2441 return TSK_Undeclared;
2444 SourceLocation VarDecl::getPointOfInstantiation() const {
2445 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
2446 return Spec->getPointOfInstantiation();
2448 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2449 return MSI->getPointOfInstantiation();
2451 return SourceLocation();
2454 VarTemplateDecl *VarDecl::getDescribedVarTemplate() const {
2455 return getASTContext().getTemplateOrSpecializationInfo(this)
2456 .dyn_cast<VarTemplateDecl *>();
2459 void VarDecl::setDescribedVarTemplate(VarTemplateDecl *Template) {
2460 getASTContext().setTemplateOrSpecializationInfo(this, Template);
2463 bool VarDecl::isKnownToBeDefined() const {
2464 const auto &LangOpts = getASTContext().getLangOpts();
2465 // In CUDA mode without relocatable device code, variables of form 'extern
2466 // __shared__ Foo foo[]' are pointers to the base of the GPU core's shared
2467 // memory pool. These are never undefined variables, even if they appear
2468 // inside of an anon namespace or static function.
2470 // With CUDA relocatable device code enabled, these variables don't get
2471 // special handling; they're treated like regular extern variables.
2472 if (LangOpts.CUDA && !LangOpts.GPURelocatableDeviceCode &&
2473 hasExternalStorage() && hasAttr<CUDASharedAttr>() &&
2474 isa<IncompleteArrayType>(getType()))
2477 return hasDefinition();
2480 bool VarDecl::isNoDestroy(const ASTContext &Ctx) const {
2481 return hasGlobalStorage() && (hasAttr<NoDestroyAttr>() ||
2482 (!Ctx.getLangOpts().RegisterStaticDestructors &&
2483 !hasAttr<AlwaysDestroyAttr>()));
2486 MemberSpecializationInfo *VarDecl::getMemberSpecializationInfo() const {
2487 if (isStaticDataMember())
2489 // return getASTContext().getInstantiatedFromStaticDataMember(this);
2490 return getASTContext().getTemplateOrSpecializationInfo(this)
2491 .dyn_cast<MemberSpecializationInfo *>();
2495 void VarDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
2496 SourceLocation PointOfInstantiation) {
2497 assert((isa<VarTemplateSpecializationDecl>(this) ||
2498 getMemberSpecializationInfo()) &&
2499 "not a variable or static data member template specialization");
2501 if (VarTemplateSpecializationDecl *Spec =
2502 dyn_cast<VarTemplateSpecializationDecl>(this)) {
2503 Spec->setSpecializationKind(TSK);
2504 if (TSK != TSK_ExplicitSpecialization && PointOfInstantiation.isValid() &&
2505 Spec->getPointOfInstantiation().isInvalid()) {
2506 Spec->setPointOfInstantiation(PointOfInstantiation);
2507 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
2508 L->InstantiationRequested(this);
2512 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo()) {
2513 MSI->setTemplateSpecializationKind(TSK);
2514 if (TSK != TSK_ExplicitSpecialization && PointOfInstantiation.isValid() &&
2515 MSI->getPointOfInstantiation().isInvalid()) {
2516 MSI->setPointOfInstantiation(PointOfInstantiation);
2517 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
2518 L->InstantiationRequested(this);
2524 VarDecl::setInstantiationOfStaticDataMember(VarDecl *VD,
2525 TemplateSpecializationKind TSK) {
2526 assert(getASTContext().getTemplateOrSpecializationInfo(this).isNull() &&
2527 "Previous template or instantiation?");
2528 getASTContext().setInstantiatedFromStaticDataMember(this, VD, TSK);
2531 //===----------------------------------------------------------------------===//
2532 // ParmVarDecl Implementation
2533 //===----------------------------------------------------------------------===//
2535 ParmVarDecl *ParmVarDecl::Create(ASTContext &C, DeclContext *DC,
2536 SourceLocation StartLoc,
2537 SourceLocation IdLoc, IdentifierInfo *Id,
2538 QualType T, TypeSourceInfo *TInfo,
2539 StorageClass S, Expr *DefArg) {
2540 return new (C, DC) ParmVarDecl(ParmVar, C, DC, StartLoc, IdLoc, Id, T, TInfo,
2544 QualType ParmVarDecl::getOriginalType() const {
2545 TypeSourceInfo *TSI = getTypeSourceInfo();
2546 QualType T = TSI ? TSI->getType() : getType();
2547 if (const auto *DT = dyn_cast<DecayedType>(T))
2548 return DT->getOriginalType();
2552 ParmVarDecl *ParmVarDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
2554 ParmVarDecl(ParmVar, C, nullptr, SourceLocation(), SourceLocation(),
2555 nullptr, QualType(), nullptr, SC_None, nullptr);
2558 SourceRange ParmVarDecl::getSourceRange() const {
2559 if (!hasInheritedDefaultArg()) {
2560 SourceRange ArgRange = getDefaultArgRange();
2561 if (ArgRange.isValid())
2562 return SourceRange(getOuterLocStart(), ArgRange.getEnd());
2565 // DeclaratorDecl considers the range of postfix types as overlapping with the
2566 // declaration name, but this is not the case with parameters in ObjC methods.
2567 if (isa<ObjCMethodDecl>(getDeclContext()))
2568 return SourceRange(DeclaratorDecl::getBeginLoc(), getLocation());
2570 return DeclaratorDecl::getSourceRange();
2573 Expr *ParmVarDecl::getDefaultArg() {
2574 assert(!hasUnparsedDefaultArg() && "Default argument is not yet parsed!");
2575 assert(!hasUninstantiatedDefaultArg() &&
2576 "Default argument is not yet instantiated!");
2578 Expr *Arg = getInit();
2579 if (auto *E = dyn_cast_or_null<FullExpr>(Arg))
2580 return E->getSubExpr();
2585 void ParmVarDecl::setDefaultArg(Expr *defarg) {
2586 ParmVarDeclBits.DefaultArgKind = DAK_Normal;
2590 SourceRange ParmVarDecl::getDefaultArgRange() const {
2591 switch (ParmVarDeclBits.DefaultArgKind) {
2594 // Nothing we can do here.
2595 return SourceRange();
2597 case DAK_Uninstantiated:
2598 return getUninstantiatedDefaultArg()->getSourceRange();
2601 if (const Expr *E = getInit())
2602 return E->getSourceRange();
2604 // Missing an actual expression, may be invalid.
2605 return SourceRange();
2607 llvm_unreachable("Invalid default argument kind.");
2610 void ParmVarDecl::setUninstantiatedDefaultArg(Expr *arg) {
2611 ParmVarDeclBits.DefaultArgKind = DAK_Uninstantiated;
2615 Expr *ParmVarDecl::getUninstantiatedDefaultArg() {
2616 assert(hasUninstantiatedDefaultArg() &&
2617 "Wrong kind of initialization expression!");
2618 return cast_or_null<Expr>(Init.get<Stmt *>());
2621 bool ParmVarDecl::hasDefaultArg() const {
2622 // FIXME: We should just return false for DAK_None here once callers are
2623 // prepared for the case that we encountered an invalid default argument and
2624 // were unable to even build an invalid expression.
2625 return hasUnparsedDefaultArg() || hasUninstantiatedDefaultArg() ||
2629 bool ParmVarDecl::isParameterPack() const {
2630 return isa<PackExpansionType>(getType());
2633 void ParmVarDecl::setParameterIndexLarge(unsigned parameterIndex) {
2634 getASTContext().setParameterIndex(this, parameterIndex);
2635 ParmVarDeclBits.ParameterIndex = ParameterIndexSentinel;
2638 unsigned ParmVarDecl::getParameterIndexLarge() const {
2639 return getASTContext().getParameterIndex(this);
2642 //===----------------------------------------------------------------------===//
2643 // FunctionDecl Implementation
2644 //===----------------------------------------------------------------------===//
2646 FunctionDecl::FunctionDecl(Kind DK, ASTContext &C, DeclContext *DC,
2647 SourceLocation StartLoc,
2648 const DeclarationNameInfo &NameInfo, QualType T,
2649 TypeSourceInfo *TInfo, StorageClass S,
2650 bool isInlineSpecified, bool isConstexprSpecified)
2651 : DeclaratorDecl(DK, DC, NameInfo.getLoc(), NameInfo.getName(), T, TInfo,
2653 DeclContext(DK), redeclarable_base(C), ODRHash(0),
2654 EndRangeLoc(NameInfo.getEndLoc()), DNLoc(NameInfo.getInfo()) {
2655 assert(T.isNull() || T->isFunctionType());
2656 FunctionDeclBits.SClass = S;
2657 FunctionDeclBits.IsInline = isInlineSpecified;
2658 FunctionDeclBits.IsInlineSpecified = isInlineSpecified;
2659 FunctionDeclBits.IsExplicitSpecified = false;
2660 FunctionDeclBits.IsVirtualAsWritten = false;
2661 FunctionDeclBits.IsPure = false;
2662 FunctionDeclBits.HasInheritedPrototype = false;
2663 FunctionDeclBits.HasWrittenPrototype = true;
2664 FunctionDeclBits.IsDeleted = false;
2665 FunctionDeclBits.IsTrivial = false;
2666 FunctionDeclBits.IsTrivialForCall = false;
2667 FunctionDeclBits.IsDefaulted = false;
2668 FunctionDeclBits.IsExplicitlyDefaulted = false;
2669 FunctionDeclBits.HasImplicitReturnZero = false;
2670 FunctionDeclBits.IsLateTemplateParsed = false;
2671 FunctionDeclBits.IsConstexpr = isConstexprSpecified;
2672 FunctionDeclBits.InstantiationIsPending = false;
2673 FunctionDeclBits.UsesSEHTry = false;
2674 FunctionDeclBits.HasSkippedBody = false;
2675 FunctionDeclBits.WillHaveBody = false;
2676 FunctionDeclBits.IsMultiVersion = false;
2677 FunctionDeclBits.IsCopyDeductionCandidate = false;
2678 FunctionDeclBits.HasODRHash = false;
2681 void FunctionDecl::getNameForDiagnostic(
2682 raw_ostream &OS, const PrintingPolicy &Policy, bool Qualified) const {
2683 NamedDecl::getNameForDiagnostic(OS, Policy, Qualified);
2684 const TemplateArgumentList *TemplateArgs = getTemplateSpecializationArgs();
2686 printTemplateArgumentList(OS, TemplateArgs->asArray(), Policy);
2689 bool FunctionDecl::isVariadic() const {
2690 if (const auto *FT = getType()->getAs<FunctionProtoType>())
2691 return FT->isVariadic();
2695 bool FunctionDecl::hasBody(const FunctionDecl *&Definition) const {
2696 for (auto I : redecls()) {
2697 if (I->doesThisDeclarationHaveABody()) {
2706 bool FunctionDecl::hasTrivialBody() const
2708 Stmt *S = getBody();
2710 // Since we don't have a body for this function, we don't know if it's
2715 if (isa<CompoundStmt>(S) && cast<CompoundStmt>(S)->body_empty())
2720 bool FunctionDecl::isDefined(const FunctionDecl *&Definition) const {
2721 for (auto I : redecls()) {
2722 if (I->isThisDeclarationADefinition()) {
2731 Stmt *FunctionDecl::getBody(const FunctionDecl *&Definition) const {
2732 if (!hasBody(Definition))
2735 if (Definition->Body)
2736 return Definition->Body.get(getASTContext().getExternalSource());
2741 void FunctionDecl::setBody(Stmt *B) {
2744 EndRangeLoc = B->getEndLoc();
2747 void FunctionDecl::setPure(bool P) {
2748 FunctionDeclBits.IsPure = P;
2750 if (auto *Parent = dyn_cast<CXXRecordDecl>(getDeclContext()))
2751 Parent->markedVirtualFunctionPure();
2754 template<std::size_t Len>
2755 static bool isNamed(const NamedDecl *ND, const char (&Str)[Len]) {
2756 IdentifierInfo *II = ND->getIdentifier();
2757 return II && II->isStr(Str);
2760 bool FunctionDecl::isMain() const {
2761 const TranslationUnitDecl *tunit =
2762 dyn_cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext());
2764 !tunit->getASTContext().getLangOpts().Freestanding &&
2765 isNamed(this, "main");
2768 bool FunctionDecl::isMSVCRTEntryPoint() const {
2769 const TranslationUnitDecl *TUnit =
2770 dyn_cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext());
2774 // Even though we aren't really targeting MSVCRT if we are freestanding,
2775 // semantic analysis for these functions remains the same.
2777 // MSVCRT entry points only exist on MSVCRT targets.
2778 if (!TUnit->getASTContext().getTargetInfo().getTriple().isOSMSVCRT())
2781 // Nameless functions like constructors cannot be entry points.
2782 if (!getIdentifier())
2785 return llvm::StringSwitch<bool>(getName())
2786 .Cases("main", // an ANSI console app
2787 "wmain", // a Unicode console App
2788 "WinMain", // an ANSI GUI app
2789 "wWinMain", // a Unicode GUI app
2795 bool FunctionDecl::isReservedGlobalPlacementOperator() const {
2796 assert(getDeclName().getNameKind() == DeclarationName::CXXOperatorName);
2797 assert(getDeclName().getCXXOverloadedOperator() == OO_New ||
2798 getDeclName().getCXXOverloadedOperator() == OO_Delete ||
2799 getDeclName().getCXXOverloadedOperator() == OO_Array_New ||
2800 getDeclName().getCXXOverloadedOperator() == OO_Array_Delete);
2802 if (!getDeclContext()->getRedeclContext()->isTranslationUnit())
2805 const auto *proto = getType()->castAs<FunctionProtoType>();
2806 if (proto->getNumParams() != 2 || proto->isVariadic())
2809 ASTContext &Context =
2810 cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext())
2813 // The result type and first argument type are constant across all
2814 // these operators. The second argument must be exactly void*.
2815 return (proto->getParamType(1).getCanonicalType() == Context.VoidPtrTy);
2818 bool FunctionDecl::isReplaceableGlobalAllocationFunction(bool *IsAligned) const {
2819 if (getDeclName().getNameKind() != DeclarationName::CXXOperatorName)
2821 if (getDeclName().getCXXOverloadedOperator() != OO_New &&
2822 getDeclName().getCXXOverloadedOperator() != OO_Delete &&
2823 getDeclName().getCXXOverloadedOperator() != OO_Array_New &&
2824 getDeclName().getCXXOverloadedOperator() != OO_Array_Delete)
2827 if (isa<CXXRecordDecl>(getDeclContext()))
2830 // This can only fail for an invalid 'operator new' declaration.
2831 if (!getDeclContext()->getRedeclContext()->isTranslationUnit())
2834 const auto *FPT = getType()->castAs<FunctionProtoType>();
2835 if (FPT->getNumParams() == 0 || FPT->getNumParams() > 3 || FPT->isVariadic())
2838 // If this is a single-parameter function, it must be a replaceable global
2839 // allocation or deallocation function.
2840 if (FPT->getNumParams() == 1)
2843 unsigned Params = 1;
2844 QualType Ty = FPT->getParamType(Params);
2845 ASTContext &Ctx = getASTContext();
2847 auto Consume = [&] {
2849 Ty = Params < FPT->getNumParams() ? FPT->getParamType(Params) : QualType();
2852 // In C++14, the next parameter can be a 'std::size_t' for sized delete.
2853 bool IsSizedDelete = false;
2854 if (Ctx.getLangOpts().SizedDeallocation &&
2855 (getDeclName().getCXXOverloadedOperator() == OO_Delete ||
2856 getDeclName().getCXXOverloadedOperator() == OO_Array_Delete) &&
2857 Ctx.hasSameType(Ty, Ctx.getSizeType())) {
2858 IsSizedDelete = true;
2862 // In C++17, the next parameter can be a 'std::align_val_t' for aligned
2864 if (Ctx.getLangOpts().AlignedAllocation && !Ty.isNull() && Ty->isAlignValT()) {
2870 // Finally, if this is not a sized delete, the final parameter can
2871 // be a 'const std::nothrow_t&'.
2872 if (!IsSizedDelete && !Ty.isNull() && Ty->isReferenceType()) {
2873 Ty = Ty->getPointeeType();
2874 if (Ty.getCVRQualifiers() != Qualifiers::Const)
2876 const CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
2877 if (RD && isNamed(RD, "nothrow_t") && RD->isInStdNamespace())
2881 return Params == FPT->getNumParams();
2884 bool FunctionDecl::isDestroyingOperatorDelete() const {
2886 // Within a class C, a single object deallocation function with signature
2887 // (T, std::destroying_delete_t, <more params>)
2888 // is a destroying operator delete.
2889 if (!isa<CXXMethodDecl>(this) || getOverloadedOperator() != OO_Delete ||
2893 auto *RD = getParamDecl(1)->getType()->getAsCXXRecordDecl();
2894 return RD && RD->isInStdNamespace() && RD->getIdentifier() &&
2895 RD->getIdentifier()->isStr("destroying_delete_t");
2898 LanguageLinkage FunctionDecl::getLanguageLinkage() const {
2899 return getDeclLanguageLinkage(*this);
2902 bool FunctionDecl::isExternC() const {
2903 return isDeclExternC(*this);
2906 bool FunctionDecl::isInExternCContext() const {
2907 return getLexicalDeclContext()->isExternCContext();
2910 bool FunctionDecl::isInExternCXXContext() const {
2911 return getLexicalDeclContext()->isExternCXXContext();
2914 bool FunctionDecl::isGlobal() const {
2915 if (const auto *Method = dyn_cast<CXXMethodDecl>(this))
2916 return Method->isStatic();
2918 if (getCanonicalDecl()->getStorageClass() == SC_Static)
2921 for (const DeclContext *DC = getDeclContext();
2923 DC = DC->getParent()) {
2924 if (const auto *Namespace = cast<NamespaceDecl>(DC)) {
2925 if (!Namespace->getDeclName())
2934 bool FunctionDecl::isNoReturn() const {
2935 if (hasAttr<NoReturnAttr>() || hasAttr<CXX11NoReturnAttr>() ||
2936 hasAttr<C11NoReturnAttr>())
2939 if (auto *FnTy = getType()->getAs<FunctionType>())
2940 return FnTy->getNoReturnAttr();
2946 MultiVersionKind FunctionDecl::getMultiVersionKind() const {
2947 if (hasAttr<TargetAttr>())
2948 return MultiVersionKind::Target;
2949 if (hasAttr<CPUDispatchAttr>())
2950 return MultiVersionKind::CPUDispatch;
2951 if (hasAttr<CPUSpecificAttr>())
2952 return MultiVersionKind::CPUSpecific;
2953 return MultiVersionKind::None;
2956 bool FunctionDecl::isCPUDispatchMultiVersion() const {
2957 return isMultiVersion() && hasAttr<CPUDispatchAttr>();
2960 bool FunctionDecl::isCPUSpecificMultiVersion() const {
2961 return isMultiVersion() && hasAttr<CPUSpecificAttr>();
2964 bool FunctionDecl::isTargetMultiVersion() const {
2965 return isMultiVersion() && hasAttr<TargetAttr>();
2969 FunctionDecl::setPreviousDeclaration(FunctionDecl *PrevDecl) {
2970 redeclarable_base::setPreviousDecl(PrevDecl);
2972 if (FunctionTemplateDecl *FunTmpl = getDescribedFunctionTemplate()) {
2973 FunctionTemplateDecl *PrevFunTmpl
2974 = PrevDecl? PrevDecl->getDescribedFunctionTemplate() : nullptr;
2975 assert((!PrevDecl || PrevFunTmpl) && "Function/function template mismatch");
2976 FunTmpl->setPreviousDecl(PrevFunTmpl);
2979 if (PrevDecl && PrevDecl->isInlined())
2980 setImplicitlyInline(true);
2983 FunctionDecl *FunctionDecl::getCanonicalDecl() { return getFirstDecl(); }
2985 /// Returns a value indicating whether this function
2986 /// corresponds to a builtin function.
2988 /// The function corresponds to a built-in function if it is
2989 /// declared at translation scope or within an extern "C" block and
2990 /// its name matches with the name of a builtin. The returned value
2991 /// will be 0 for functions that do not correspond to a builtin, a
2992 /// value of type \c Builtin::ID if in the target-independent range
2993 /// \c [1,Builtin::First), or a target-specific builtin value.
2994 unsigned FunctionDecl::getBuiltinID() const {
2995 if (!getIdentifier())
2998 unsigned BuiltinID = getIdentifier()->getBuiltinID();
3002 ASTContext &Context = getASTContext();
3003 if (Context.getLangOpts().CPlusPlus) {
3004 const auto *LinkageDecl =
3005 dyn_cast<LinkageSpecDecl>(getFirstDecl()->getDeclContext());
3006 // In C++, the first declaration of a builtin is always inside an implicit
3008 // FIXME: A recognised library function may not be directly in an extern "C"
3009 // declaration, for instance "extern "C" { namespace std { decl } }".
3011 if (BuiltinID == Builtin::BI__GetExceptionInfo &&
3012 Context.getTargetInfo().getCXXABI().isMicrosoft())
3013 return Builtin::BI__GetExceptionInfo;
3016 if (LinkageDecl->getLanguage() != LinkageSpecDecl::lang_c)
3020 // If the function is marked "overloadable", it has a different mangled name
3021 // and is not the C library function.
3022 if (hasAttr<OverloadableAttr>())
3025 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))
3028 // This function has the name of a known C library
3029 // function. Determine whether it actually refers to the C library
3030 // function or whether it just has the same name.
3032 // If this is a static function, it's not a builtin.
3033 if (getStorageClass() == SC_Static)
3036 // OpenCL v1.2 s6.9.f - The library functions defined in
3037 // the C99 standard headers are not available.
3038 if (Context.getLangOpts().OpenCL &&
3039 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))
3042 // CUDA does not have device-side standard library. printf and malloc are the
3043 // only special cases that are supported by device-side runtime.
3044 if (Context.getLangOpts().CUDA && hasAttr<CUDADeviceAttr>() &&
3045 !hasAttr<CUDAHostAttr>() &&
3046 !(BuiltinID == Builtin::BIprintf || BuiltinID == Builtin::BImalloc))
3052 /// getNumParams - Return the number of parameters this function must have
3053 /// based on its FunctionType. This is the length of the ParamInfo array
3054 /// after it has been created.
3055 unsigned FunctionDecl::getNumParams() const {
3056 const auto *FPT = getType()->getAs<FunctionProtoType>();
3057 return FPT ? FPT->getNumParams() : 0;
3060 void FunctionDecl::setParams(ASTContext &C,
3061 ArrayRef<ParmVarDecl *> NewParamInfo) {
3062 assert(!ParamInfo && "Already has param info!");
3063 assert(NewParamInfo.size() == getNumParams() && "Parameter count mismatch!");
3065 // Zero params -> null pointer.
3066 if (!NewParamInfo.empty()) {
3067 ParamInfo = new (C) ParmVarDecl*[NewParamInfo.size()];
3068 std::copy(NewParamInfo.begin(), NewParamInfo.end(), ParamInfo);
3072 /// getMinRequiredArguments - Returns the minimum number of arguments
3073 /// needed to call this function. This may be fewer than the number of
3074 /// function parameters, if some of the parameters have default
3075 /// arguments (in C++) or are parameter packs (C++11).
3076 unsigned FunctionDecl::getMinRequiredArguments() const {
3077 if (!getASTContext().getLangOpts().CPlusPlus)
3078 return getNumParams();
3080 unsigned NumRequiredArgs = 0;
3081 for (auto *Param : parameters())
3082 if (!Param->isParameterPack() && !Param->hasDefaultArg())
3084 return NumRequiredArgs;
3087 /// The combination of the extern and inline keywords under MSVC forces
3088 /// the function to be required.
3090 /// Note: This function assumes that we will only get called when isInlined()
3091 /// would return true for this FunctionDecl.
3092 bool FunctionDecl::isMSExternInline() const {
3093 assert(isInlined() && "expected to get called on an inlined function!");
3095 const ASTContext &Context = getASTContext();
3096 if (!Context.getTargetInfo().getCXXABI().isMicrosoft() &&
3097 !hasAttr<DLLExportAttr>())
3100 for (const FunctionDecl *FD = getMostRecentDecl(); FD;
3101 FD = FD->getPreviousDecl())
3102 if (!FD->isImplicit() && FD->getStorageClass() == SC_Extern)
3108 static bool redeclForcesDefMSVC(const FunctionDecl *Redecl) {
3109 if (Redecl->getStorageClass() != SC_Extern)
3112 for (const FunctionDecl *FD = Redecl->getPreviousDecl(); FD;
3113 FD = FD->getPreviousDecl())
3114 if (!FD->isImplicit() && FD->getStorageClass() == SC_Extern)
3120 static bool RedeclForcesDefC99(const FunctionDecl *Redecl) {
3121 // Only consider file-scope declarations in this test.
3122 if (!Redecl->getLexicalDeclContext()->isTranslationUnit())
3125 // Only consider explicit declarations; the presence of a builtin for a
3126 // libcall shouldn't affect whether a definition is externally visible.
3127 if (Redecl->isImplicit())
3130 if (!Redecl->isInlineSpecified() || Redecl->getStorageClass() == SC_Extern)
3131 return true; // Not an inline definition
3136 /// For a function declaration in C or C++, determine whether this
3137 /// declaration causes the definition to be externally visible.
3139 /// For instance, this determines if adding the current declaration to the set
3140 /// of redeclarations of the given functions causes
3141 /// isInlineDefinitionExternallyVisible to change from false to true.
3142 bool FunctionDecl::doesDeclarationForceExternallyVisibleDefinition() const {
3143 assert(!doesThisDeclarationHaveABody() &&
3144 "Must have a declaration without a body.");
3146 ASTContext &Context = getASTContext();
3148 if (Context.getLangOpts().MSVCCompat) {
3149 const FunctionDecl *Definition;
3150 if (hasBody(Definition) && Definition->isInlined() &&
3151 redeclForcesDefMSVC(this))
3155 if (Context.getLangOpts().GNUInline || hasAttr<GNUInlineAttr>()) {
3156 // With GNU inlining, a declaration with 'inline' but not 'extern', forces
3157 // an externally visible definition.
3159 // FIXME: What happens if gnu_inline gets added on after the first
3161 if (!isInlineSpecified() || getStorageClass() == SC_Extern)
3164 const FunctionDecl *Prev = this;
3165 bool FoundBody = false;
3166 while ((Prev = Prev->getPreviousDecl())) {
3167 FoundBody |= Prev->Body.isValid();
3170 // If it's not the case that both 'inline' and 'extern' are
3171 // specified on the definition, then it is always externally visible.
3172 if (!Prev->isInlineSpecified() ||
3173 Prev->getStorageClass() != SC_Extern)
3175 } else if (Prev->isInlineSpecified() &&
3176 Prev->getStorageClass() != SC_Extern) {
3183 if (Context.getLangOpts().CPlusPlus)
3187 // [...] If all of the file scope declarations for a function in a
3188 // translation unit include the inline function specifier without extern,
3189 // then the definition in that translation unit is an inline definition.
3190 if (isInlineSpecified() && getStorageClass() != SC_Extern)
3192 const FunctionDecl *Prev = this;
3193 bool FoundBody = false;
3194 while ((Prev = Prev->getPreviousDecl())) {
3195 FoundBody |= Prev->Body.isValid();
3196 if (RedeclForcesDefC99(Prev))
3202 SourceRange FunctionDecl::getReturnTypeSourceRange() const {
3203 const TypeSourceInfo *TSI = getTypeSourceInfo();
3205 return SourceRange();
3206 FunctionTypeLoc FTL =
3207 TSI->getTypeLoc().IgnoreParens().getAs<FunctionTypeLoc>();
3209 return SourceRange();
3211 // Skip self-referential return types.
3212 const SourceManager &SM = getASTContext().getSourceManager();
3213 SourceRange RTRange = FTL.getReturnLoc().getSourceRange();
3214 SourceLocation Boundary = getNameInfo().getBeginLoc();
3215 if (RTRange.isInvalid() || Boundary.isInvalid() ||
3216 !SM.isBeforeInTranslationUnit(RTRange.getEnd(), Boundary))
3217 return SourceRange();
3222 SourceRange FunctionDecl::getExceptionSpecSourceRange() const {
3223 const TypeSourceInfo *TSI = getTypeSourceInfo();
3225 return SourceRange();
3226 FunctionTypeLoc FTL =
3227 TSI->getTypeLoc().IgnoreParens().getAs<FunctionTypeLoc>();
3229 return SourceRange();
3231 return FTL.getExceptionSpecRange();
3234 /// For an inline function definition in C, or for a gnu_inline function
3235 /// in C++, determine whether the definition will be externally visible.
3237 /// Inline function definitions are always available for inlining optimizations.
3238 /// However, depending on the language dialect, declaration specifiers, and
3239 /// attributes, the definition of an inline function may or may not be
3240 /// "externally" visible to other translation units in the program.
3242 /// In C99, inline definitions are not externally visible by default. However,
3243 /// if even one of the global-scope declarations is marked "extern inline", the
3244 /// inline definition becomes externally visible (C99 6.7.4p6).
3246 /// In GNU89 mode, or if the gnu_inline attribute is attached to the function
3247 /// definition, we use the GNU semantics for inline, which are nearly the
3248 /// opposite of C99 semantics. In particular, "inline" by itself will create
3249 /// an externally visible symbol, but "extern inline" will not create an
3250 /// externally visible symbol.
3251 bool FunctionDecl::isInlineDefinitionExternallyVisible() const {
3252 assert((doesThisDeclarationHaveABody() || willHaveBody()) &&
3253 "Must be a function definition");
3254 assert(isInlined() && "Function must be inline");
3255 ASTContext &Context = getASTContext();
3257 if (Context.getLangOpts().GNUInline || hasAttr<GNUInlineAttr>()) {
3258 // Note: If you change the logic here, please change
3259 // doesDeclarationForceExternallyVisibleDefinition as well.
3261 // If it's not the case that both 'inline' and 'extern' are
3262 // specified on the definition, then this inline definition is
3263 // externally visible.
3264 if (!(isInlineSpecified() && getStorageClass() == SC_Extern))
3267 // If any declaration is 'inline' but not 'extern', then this definition
3268 // is externally visible.
3269 for (auto Redecl : redecls()) {
3270 if (Redecl->isInlineSpecified() &&
3271 Redecl->getStorageClass() != SC_Extern)
3278 // The rest of this function is C-only.
3279 assert(!Context.getLangOpts().CPlusPlus &&
3280 "should not use C inline rules in C++");
3283 // [...] If all of the file scope declarations for a function in a
3284 // translation unit include the inline function specifier without extern,
3285 // then the definition in that translation unit is an inline definition.
3286 for (auto Redecl : redecls()) {
3287 if (RedeclForcesDefC99(Redecl))
3292 // An inline definition does not provide an external definition for the
3293 // function, and does not forbid an external definition in another
3294 // translation unit.
3298 /// getOverloadedOperator - Which C++ overloaded operator this
3299 /// function represents, if any.
3300 OverloadedOperatorKind FunctionDecl::getOverloadedOperator() const {
3301 if (getDeclName().getNameKind() == DeclarationName::CXXOperatorName)
3302 return getDeclName().getCXXOverloadedOperator();
3307 /// getLiteralIdentifier - The literal suffix identifier this function
3308 /// represents, if any.
3309 const IdentifierInfo *FunctionDecl::getLiteralIdentifier() const {
3310 if (getDeclName().getNameKind() == DeclarationName::CXXLiteralOperatorName)
3311 return getDeclName().getCXXLiteralIdentifier();
3316 FunctionDecl::TemplatedKind FunctionDecl::getTemplatedKind() const {
3317 if (TemplateOrSpecialization.isNull())
3318 return TK_NonTemplate;
3319 if (TemplateOrSpecialization.is<FunctionTemplateDecl *>())
3320 return TK_FunctionTemplate;
3321 if (TemplateOrSpecialization.is<MemberSpecializationInfo *>())
3322 return TK_MemberSpecialization;
3323 if (TemplateOrSpecialization.is<FunctionTemplateSpecializationInfo *>())
3324 return TK_FunctionTemplateSpecialization;
3325 if (TemplateOrSpecialization.is
3326 <DependentFunctionTemplateSpecializationInfo*>())
3327 return TK_DependentFunctionTemplateSpecialization;
3329 llvm_unreachable("Did we miss a TemplateOrSpecialization type?");
3332 FunctionDecl *FunctionDecl::getInstantiatedFromMemberFunction() const {
3333 if (MemberSpecializationInfo *Info = getMemberSpecializationInfo())
3334 return cast<FunctionDecl>(Info->getInstantiatedFrom());
3339 MemberSpecializationInfo *FunctionDecl::getMemberSpecializationInfo() const {
3340 return TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>();
3344 FunctionDecl::setInstantiationOfMemberFunction(ASTContext &C,
3346 TemplateSpecializationKind TSK) {
3347 assert(TemplateOrSpecialization.isNull() &&
3348 "Member function is already a specialization");
3349 MemberSpecializationInfo *Info
3350 = new (C) MemberSpecializationInfo(FD, TSK);
3351 TemplateOrSpecialization = Info;
3354 FunctionTemplateDecl *FunctionDecl::getDescribedFunctionTemplate() const {
3355 return TemplateOrSpecialization.dyn_cast<FunctionTemplateDecl *>();
3358 void FunctionDecl::setDescribedFunctionTemplate(FunctionTemplateDecl *Template) {
3359 TemplateOrSpecialization = Template;
3362 bool FunctionDecl::isImplicitlyInstantiable() const {
3363 // If the function is invalid, it can't be implicitly instantiated.
3364 if (isInvalidDecl())
3367 switch (getTemplateSpecializationKind()) {
3368 case TSK_Undeclared:
3369 case TSK_ExplicitInstantiationDefinition:
3372 case TSK_ImplicitInstantiation:
3375 // It is possible to instantiate TSK_ExplicitSpecialization kind
3376 // if the FunctionDecl has a class scope specialization pattern.
3377 case TSK_ExplicitSpecialization:
3378 return getClassScopeSpecializationPattern() != nullptr;
3380 case TSK_ExplicitInstantiationDeclaration:
3385 // Find the actual template from which we will instantiate.
3386 const FunctionDecl *PatternDecl = getTemplateInstantiationPattern();
3387 bool HasPattern = false;
3389 HasPattern = PatternDecl->hasBody(PatternDecl);
3391 // C++0x [temp.explicit]p9:
3392 // Except for inline functions, other explicit instantiation declarations
3393 // have the effect of suppressing the implicit instantiation of the entity
3394 // to which they refer.
3395 if (!HasPattern || !PatternDecl)
3398 return PatternDecl->isInlined();
3401 bool FunctionDecl::isTemplateInstantiation() const {
3402 switch (getTemplateSpecializationKind()) {
3403 case TSK_Undeclared:
3404 case TSK_ExplicitSpecialization:
3406 case TSK_ImplicitInstantiation:
3407 case TSK_ExplicitInstantiationDeclaration:
3408 case TSK_ExplicitInstantiationDefinition:
3411 llvm_unreachable("All TSK values handled.");
3414 FunctionDecl *FunctionDecl::getTemplateInstantiationPattern() const {
3415 // Handle class scope explicit specialization special case.
3416 if (getTemplateSpecializationKind() == TSK_ExplicitSpecialization) {
3417 if (auto *Spec = getClassScopeSpecializationPattern())
3418 return getDefinitionOrSelf(Spec);
3422 // If this is a generic lambda call operator specialization, its
3423 // instantiation pattern is always its primary template's pattern
3424 // even if its primary template was instantiated from another
3425 // member template (which happens with nested generic lambdas).
3426 // Since a lambda's call operator's body is transformed eagerly,
3427 // we don't have to go hunting for a prototype definition template
3428 // (i.e. instantiated-from-member-template) to use as an instantiation
3431 if (isGenericLambdaCallOperatorSpecialization(
3432 dyn_cast<CXXMethodDecl>(this))) {
3433 assert(getPrimaryTemplate() && "not a generic lambda call operator?");
3434 return getDefinitionOrSelf(getPrimaryTemplate()->getTemplatedDecl());
3437 if (FunctionTemplateDecl *Primary = getPrimaryTemplate()) {
3438 while (Primary->getInstantiatedFromMemberTemplate()) {
3439 // If we have hit a point where the user provided a specialization of
3440 // this template, we're done looking.
3441 if (Primary->isMemberSpecialization())
3443 Primary = Primary->getInstantiatedFromMemberTemplate();
3446 return getDefinitionOrSelf(Primary->getTemplatedDecl());
3449 if (auto *MFD = getInstantiatedFromMemberFunction())
3450 return getDefinitionOrSelf(MFD);
3455 FunctionTemplateDecl *FunctionDecl::getPrimaryTemplate() const {
3456 if (FunctionTemplateSpecializationInfo *Info
3457 = TemplateOrSpecialization
3458 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3459 return Info->Template.getPointer();
3464 FunctionDecl *FunctionDecl::getClassScopeSpecializationPattern() const {
3465 return getASTContext().getClassScopeSpecializationPattern(this);
3468 FunctionTemplateSpecializationInfo *
3469 FunctionDecl::getTemplateSpecializationInfo() const {
3470 return TemplateOrSpecialization
3471 .dyn_cast<FunctionTemplateSpecializationInfo *>();
3474 const TemplateArgumentList *
3475 FunctionDecl::getTemplateSpecializationArgs() const {
3476 if (FunctionTemplateSpecializationInfo *Info
3477 = TemplateOrSpecialization
3478 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3479 return Info->TemplateArguments;
3484 const ASTTemplateArgumentListInfo *
3485 FunctionDecl::getTemplateSpecializationArgsAsWritten() const {
3486 if (FunctionTemplateSpecializationInfo *Info
3487 = TemplateOrSpecialization
3488 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3489 return Info->TemplateArgumentsAsWritten;
3495 FunctionDecl::setFunctionTemplateSpecialization(ASTContext &C,
3496 FunctionTemplateDecl *Template,
3497 const TemplateArgumentList *TemplateArgs,
3499 TemplateSpecializationKind TSK,
3500 const TemplateArgumentListInfo *TemplateArgsAsWritten,
3501 SourceLocation PointOfInstantiation) {
3502 assert(TSK != TSK_Undeclared &&
3503 "Must specify the type of function template specialization");
3504 FunctionTemplateSpecializationInfo *Info
3505 = TemplateOrSpecialization.dyn_cast<FunctionTemplateSpecializationInfo*>();
3507 Info = FunctionTemplateSpecializationInfo::Create(C, this, Template, TSK,
3509 TemplateArgsAsWritten,
3510 PointOfInstantiation);
3511 TemplateOrSpecialization = Info;
3512 Template->addSpecialization(Info, InsertPos);
3516 FunctionDecl::setDependentTemplateSpecialization(ASTContext &Context,
3517 const UnresolvedSetImpl &Templates,
3518 const TemplateArgumentListInfo &TemplateArgs) {
3519 assert(TemplateOrSpecialization.isNull());
3520 DependentFunctionTemplateSpecializationInfo *Info =
3521 DependentFunctionTemplateSpecializationInfo::Create(Context, Templates,
3523 TemplateOrSpecialization = Info;
3526 DependentFunctionTemplateSpecializationInfo *
3527 FunctionDecl::getDependentSpecializationInfo() const {
3528 return TemplateOrSpecialization
3529 .dyn_cast<DependentFunctionTemplateSpecializationInfo *>();
3532 DependentFunctionTemplateSpecializationInfo *
3533 DependentFunctionTemplateSpecializationInfo::Create(
3534 ASTContext &Context, const UnresolvedSetImpl &Ts,
3535 const TemplateArgumentListInfo &TArgs) {
3536 void *Buffer = Context.Allocate(
3537 totalSizeToAlloc<TemplateArgumentLoc, FunctionTemplateDecl *>(
3538 TArgs.size(), Ts.size()));
3539 return new (Buffer) DependentFunctionTemplateSpecializationInfo(Ts, TArgs);
3542 DependentFunctionTemplateSpecializationInfo::
3543 DependentFunctionTemplateSpecializationInfo(const UnresolvedSetImpl &Ts,
3544 const TemplateArgumentListInfo &TArgs)
3545 : AngleLocs(TArgs.getLAngleLoc(), TArgs.getRAngleLoc()) {
3546 NumTemplates = Ts.size();
3547 NumArgs = TArgs.size();
3549 FunctionTemplateDecl **TsArray = getTrailingObjects<FunctionTemplateDecl *>();
3550 for (unsigned I = 0, E = Ts.size(); I != E; ++I)
3551 TsArray[I] = cast<FunctionTemplateDecl>(Ts[I]->getUnderlyingDecl());
3553 TemplateArgumentLoc *ArgsArray = getTrailingObjects<TemplateArgumentLoc>();
3554 for (unsigned I = 0, E = TArgs.size(); I != E; ++I)
3555 new (&ArgsArray[I]) TemplateArgumentLoc(TArgs[I]);
3558 TemplateSpecializationKind FunctionDecl::getTemplateSpecializationKind() const {
3559 // For a function template specialization, query the specialization
3560 // information object.
3561 FunctionTemplateSpecializationInfo *FTSInfo
3562 = TemplateOrSpecialization.dyn_cast<FunctionTemplateSpecializationInfo*>();
3564 return FTSInfo->getTemplateSpecializationKind();
3566 MemberSpecializationInfo *MSInfo
3567 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>();
3569 return MSInfo->getTemplateSpecializationKind();
3571 return TSK_Undeclared;
3575 FunctionDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
3576 SourceLocation PointOfInstantiation) {
3577 if (FunctionTemplateSpecializationInfo *FTSInfo
3578 = TemplateOrSpecialization.dyn_cast<
3579 FunctionTemplateSpecializationInfo*>()) {
3580 FTSInfo->setTemplateSpecializationKind(TSK);
3581 if (TSK != TSK_ExplicitSpecialization &&
3582 PointOfInstantiation.isValid() &&
3583 FTSInfo->getPointOfInstantiation().isInvalid()) {
3584 FTSInfo->setPointOfInstantiation(PointOfInstantiation);
3585 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
3586 L->InstantiationRequested(this);
3588 } else if (MemberSpecializationInfo *MSInfo
3589 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>()) {
3590 MSInfo->setTemplateSpecializationKind(TSK);
3591 if (TSK != TSK_ExplicitSpecialization &&
3592 PointOfInstantiation.isValid() &&
3593 MSInfo->getPointOfInstantiation().isInvalid()) {
3594 MSInfo->setPointOfInstantiation(PointOfInstantiation);
3595 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
3596 L->InstantiationRequested(this);
3599 llvm_unreachable("Function cannot have a template specialization kind");
3602 SourceLocation FunctionDecl::getPointOfInstantiation() const {
3603 if (FunctionTemplateSpecializationInfo *FTSInfo
3604 = TemplateOrSpecialization.dyn_cast<
3605 FunctionTemplateSpecializationInfo*>())
3606 return FTSInfo->getPointOfInstantiation();
3607 else if (MemberSpecializationInfo *MSInfo
3608 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>())
3609 return MSInfo->getPointOfInstantiation();
3611 return SourceLocation();
3614 bool FunctionDecl::isOutOfLine() const {
3615 if (Decl::isOutOfLine())
3618 // If this function was instantiated from a member function of a
3619 // class template, check whether that member function was defined out-of-line.
3620 if (FunctionDecl *FD = getInstantiatedFromMemberFunction()) {
3621 const FunctionDecl *Definition;
3622 if (FD->hasBody(Definition))
3623 return Definition->isOutOfLine();
3626 // If this function was instantiated from a function template,
3627 // check whether that function template was defined out-of-line.
3628 if (FunctionTemplateDecl *FunTmpl = getPrimaryTemplate()) {
3629 const FunctionDecl *Definition;
3630 if (FunTmpl->getTemplatedDecl()->hasBody(Definition))
3631 return Definition->isOutOfLine();
3637 SourceRange FunctionDecl::getSourceRange() const {
3638 return SourceRange(getOuterLocStart(), EndRangeLoc);
3641 unsigned FunctionDecl::getMemoryFunctionKind() const {
3642 IdentifierInfo *FnInfo = getIdentifier();
3647 // Builtin handling.
3648 switch (getBuiltinID()) {
3649 case Builtin::BI__builtin_memset:
3650 case Builtin::BI__builtin___memset_chk:
3651 case Builtin::BImemset:
3652 return Builtin::BImemset;
3654 case Builtin::BI__builtin_memcpy:
3655 case Builtin::BI__builtin___memcpy_chk:
3656 case Builtin::BImemcpy:
3657 return Builtin::BImemcpy;
3659 case Builtin::BI__builtin_memmove:
3660 case Builtin::BI__builtin___memmove_chk:
3661 case Builtin::BImemmove:
3662 return Builtin::BImemmove;
3664 case Builtin::BIstrlcpy:
3665 case Builtin::BI__builtin___strlcpy_chk:
3666 return Builtin::BIstrlcpy;
3668 case Builtin::BIstrlcat:
3669 case Builtin::BI__builtin___strlcat_chk:
3670 return Builtin::BIstrlcat;
3672 case Builtin::BI__builtin_memcmp:
3673 case Builtin::BImemcmp:
3674 return Builtin::BImemcmp;
3676 case Builtin::BI__builtin_strncpy:
3677 case Builtin::BI__builtin___strncpy_chk:
3678 case Builtin::BIstrncpy:
3679 return Builtin::BIstrncpy;
3681 case Builtin::BI__builtin_strncmp:
3682 case Builtin::BIstrncmp:
3683 return Builtin::BIstrncmp;
3685 case Builtin::BI__builtin_strncasecmp:
3686 case Builtin::BIstrncasecmp:
3687 return Builtin::BIstrncasecmp;
3689 case Builtin::BI__builtin_strncat:
3690 case Builtin::BI__builtin___strncat_chk:
3691 case Builtin::BIstrncat:
3692 return Builtin::BIstrncat;
3694 case Builtin::BI__builtin_strndup:
3695 case Builtin::BIstrndup:
3696 return Builtin::BIstrndup;
3698 case Builtin::BI__builtin_strlen:
3699 case Builtin::BIstrlen:
3700 return Builtin::BIstrlen;
3702 case Builtin::BI__builtin_bzero:
3703 case Builtin::BIbzero:
3704 return Builtin::BIbzero;
3708 if (FnInfo->isStr("memset"))
3709 return Builtin::BImemset;
3710 else if (FnInfo->isStr("memcpy"))
3711 return Builtin::BImemcpy;
3712 else if (FnInfo->isStr("memmove"))
3713 return Builtin::BImemmove;
3714 else if (FnInfo->isStr("memcmp"))
3715 return Builtin::BImemcmp;
3716 else if (FnInfo->isStr("strncpy"))
3717 return Builtin::BIstrncpy;
3718 else if (FnInfo->isStr("strncmp"))
3719 return Builtin::BIstrncmp;
3720 else if (FnInfo->isStr("strncasecmp"))
3721 return Builtin::BIstrncasecmp;
3722 else if (FnInfo->isStr("strncat"))
3723 return Builtin::BIstrncat;
3724 else if (FnInfo->isStr("strndup"))
3725 return Builtin::BIstrndup;
3726 else if (FnInfo->isStr("strlen"))
3727 return Builtin::BIstrlen;
3728 else if (FnInfo->isStr("bzero"))
3729 return Builtin::BIbzero;
3736 unsigned FunctionDecl::getODRHash() const {
3737 assert(hasODRHash());
3741 unsigned FunctionDecl::getODRHash() {
3745 if (auto *FT = getInstantiatedFromMemberFunction()) {
3746 setHasODRHash(true);
3747 ODRHash = FT->getODRHash();
3752 Hash.AddFunctionDecl(this);
3753 setHasODRHash(true);
3754 ODRHash = Hash.CalculateHash();
3758 //===----------------------------------------------------------------------===//
3759 // FieldDecl Implementation
3760 //===----------------------------------------------------------------------===//
3762 FieldDecl *FieldDecl::Create(const ASTContext &C, DeclContext *DC,
3763 SourceLocation StartLoc, SourceLocation IdLoc,
3764 IdentifierInfo *Id, QualType T,
3765 TypeSourceInfo *TInfo, Expr *BW, bool Mutable,
3766 InClassInitStyle InitStyle) {
3767 return new (C, DC) FieldDecl(Decl::Field, DC, StartLoc, IdLoc, Id, T, TInfo,
3768 BW, Mutable, InitStyle);
3771 FieldDecl *FieldDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
3772 return new (C, ID) FieldDecl(Field, nullptr, SourceLocation(),
3773 SourceLocation(), nullptr, QualType(), nullptr,
3774 nullptr, false, ICIS_NoInit);
3777 bool FieldDecl::isAnonymousStructOrUnion() const {
3778 if (!isImplicit() || getDeclName())
3781 if (const auto *Record = getType()->getAs<RecordType>())
3782 return Record->getDecl()->isAnonymousStructOrUnion();
3787 unsigned FieldDecl::getBitWidthValue(const ASTContext &Ctx) const {
3788 assert(isBitField() && "not a bitfield");
3789 return getBitWidth()->EvaluateKnownConstInt(Ctx).getZExtValue();
3792 bool FieldDecl::isZeroLengthBitField(const ASTContext &Ctx) const {
3793 return isUnnamedBitfield() && !getBitWidth()->isValueDependent() &&
3794 getBitWidthValue(Ctx) == 0;
3797 unsigned FieldDecl::getFieldIndex() const {
3798 const FieldDecl *Canonical = getCanonicalDecl();
3799 if (Canonical != this)
3800 return Canonical->getFieldIndex();
3802 if (CachedFieldIndex) return CachedFieldIndex - 1;
3805 const RecordDecl *RD = getParent()->getDefinition();
3806 assert(RD && "requested index for field of struct with no definition");
3808 for (auto *Field : RD->fields()) {
3809 Field->getCanonicalDecl()->CachedFieldIndex = Index + 1;
3813 assert(CachedFieldIndex && "failed to find field in parent");
3814 return CachedFieldIndex - 1;
3817 SourceRange FieldDecl::getSourceRange() const {
3818 const Expr *FinalExpr = getInClassInitializer();
3820 FinalExpr = getBitWidth();
3822 return SourceRange(getInnerLocStart(), FinalExpr->getEndLoc());
3823 return DeclaratorDecl::getSourceRange();
3826 void FieldDecl::setCapturedVLAType(const VariableArrayType *VLAType) {
3827 assert((getParent()->isLambda() || getParent()->isCapturedRecord()) &&
3828 "capturing type in non-lambda or captured record.");
3829 assert(InitStorage.getInt() == ISK_NoInit &&
3830 InitStorage.getPointer() == nullptr &&
3831 "bit width, initializer or captured type already set");
3832 InitStorage.setPointerAndInt(const_cast<VariableArrayType *>(VLAType),
3833 ISK_CapturedVLAType);
3836 //===----------------------------------------------------------------------===//
3837 // TagDecl Implementation
3838 //===----------------------------------------------------------------------===//
3840 TagDecl::TagDecl(Kind DK, TagKind TK, const ASTContext &C, DeclContext *DC,
3841 SourceLocation L, IdentifierInfo *Id, TagDecl *PrevDecl,
3842 SourceLocation StartL)
3843 : TypeDecl(DK, DC, L, Id, StartL), DeclContext(DK), redeclarable_base(C),
3844 TypedefNameDeclOrQualifier((TypedefNameDecl *)nullptr) {
3845 assert((DK != Enum || TK == TTK_Enum) &&
3846 "EnumDecl not matched with TTK_Enum");
3847 setPreviousDecl(PrevDecl);
3849 setCompleteDefinition(false);
3850 setBeingDefined(false);
3851 setEmbeddedInDeclarator(false);
3852 setFreeStanding(false);
3853 setCompleteDefinitionRequired(false);
3856 SourceLocation TagDecl::getOuterLocStart() const {
3857 return getTemplateOrInnerLocStart(this);
3860 SourceRange TagDecl::getSourceRange() const {
3861 SourceLocation RBraceLoc = BraceRange.getEnd();
3862 SourceLocation E = RBraceLoc.isValid() ? RBraceLoc : getLocation();
3863 return SourceRange(getOuterLocStart(), E);
3866 TagDecl *TagDecl::getCanonicalDecl() { return getFirstDecl(); }
3868 void TagDecl::setTypedefNameForAnonDecl(TypedefNameDecl *TDD) {
3869 TypedefNameDeclOrQualifier = TDD;
3870 if (const Type *T = getTypeForDecl()) {
3872 assert(T->isLinkageValid());
3874 assert(isLinkageValid());
3877 void TagDecl::startDefinition() {
3878 setBeingDefined(true);
3880 if (auto *D = dyn_cast<CXXRecordDecl>(this)) {
3881 struct CXXRecordDecl::DefinitionData *Data =
3882 new (getASTContext()) struct CXXRecordDecl::DefinitionData(D);
3883 for (auto I : redecls())
3884 cast<CXXRecordDecl>(I)->DefinitionData = Data;
3888 void TagDecl::completeDefinition() {
3889 assert((!isa<CXXRecordDecl>(this) ||
3890 cast<CXXRecordDecl>(this)->hasDefinition()) &&
3891 "definition completed but not started");
3893 setCompleteDefinition(true);
3894 setBeingDefined(false);
3896 if (ASTMutationListener *L = getASTMutationListener())
3897 L->CompletedTagDefinition(this);
3900 TagDecl *TagDecl::getDefinition() const {
3901 if (isCompleteDefinition())
3902 return const_cast<TagDecl *>(this);
3904 // If it's possible for us to have an out-of-date definition, check now.
3905 if (mayHaveOutOfDateDef()) {
3906 if (IdentifierInfo *II = getIdentifier()) {
3907 if (II->isOutOfDate()) {
3908 updateOutOfDate(*II);
3913 if (const auto *CXXRD = dyn_cast<CXXRecordDecl>(this))
3914 return CXXRD->getDefinition();
3916 for (auto R : redecls())
3917 if (R->isCompleteDefinition())
3923 void TagDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) {
3925 // Make sure the extended qualifier info is allocated.
3927 TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo;
3928 // Set qualifier info.
3929 getExtInfo()->QualifierLoc = QualifierLoc;
3931 // Here Qualifier == 0, i.e., we are removing the qualifier (if any).
3933 if (getExtInfo()->NumTemplParamLists == 0) {
3934 getASTContext().Deallocate(getExtInfo());
3935 TypedefNameDeclOrQualifier = (TypedefNameDecl *)nullptr;
3938 getExtInfo()->QualifierLoc = QualifierLoc;
3943 void TagDecl::setTemplateParameterListsInfo(
3944 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
3945 assert(!TPLists.empty());
3946 // Make sure the extended decl info is allocated.
3948 // Allocate external info struct.
3949 TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo;
3950 // Set the template parameter lists info.
3951 getExtInfo()->setTemplateParameterListsInfo(Context, TPLists);
3954 //===----------------------------------------------------------------------===//
3955 // EnumDecl Implementation
3956 //===----------------------------------------------------------------------===//
3958 EnumDecl::EnumDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
3959 SourceLocation IdLoc, IdentifierInfo *Id, EnumDecl *PrevDecl,
3960 bool Scoped, bool ScopedUsingClassTag, bool Fixed)
3961 : TagDecl(Enum, TTK_Enum, C, DC, IdLoc, Id, PrevDecl, StartLoc) {
3962 assert(Scoped || !ScopedUsingClassTag);
3963 IntegerType = nullptr;
3964 setNumPositiveBits(0);
3965 setNumNegativeBits(0);
3967 setScopedUsingClassTag(ScopedUsingClassTag);
3969 setHasODRHash(false);
3973 void EnumDecl::anchor() {}
3975 EnumDecl *EnumDecl::Create(ASTContext &C, DeclContext *DC,
3976 SourceLocation StartLoc, SourceLocation IdLoc,
3978 EnumDecl *PrevDecl, bool IsScoped,
3979 bool IsScopedUsingClassTag, bool IsFixed) {
3980 auto *Enum = new (C, DC) EnumDecl(C, DC, StartLoc, IdLoc, Id, PrevDecl,
3981 IsScoped, IsScopedUsingClassTag, IsFixed);
3982 Enum->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
3983 C.getTypeDeclType(Enum, PrevDecl);
3987 EnumDecl *EnumDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
3989 new (C, ID) EnumDecl(C, nullptr, SourceLocation(), SourceLocation(),
3990 nullptr, nullptr, false, false, false);
3991 Enum->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
3995 SourceRange EnumDecl::getIntegerTypeRange() const {
3996 if (const TypeSourceInfo *TI = getIntegerTypeSourceInfo())
3997 return TI->getTypeLoc().getSourceRange();
3998 return SourceRange();
4001 void EnumDecl::completeDefinition(QualType NewType,
4002 QualType NewPromotionType,
4003 unsigned NumPositiveBits,
4004 unsigned NumNegativeBits) {
4005 assert(!isCompleteDefinition() && "Cannot redefine enums!");
4007 IntegerType = NewType.getTypePtr();
4008 PromotionType = NewPromotionType;
4009 setNumPositiveBits(NumPositiveBits);
4010 setNumNegativeBits(NumNegativeBits);
4011 TagDecl::completeDefinition();
4014 bool EnumDecl::isClosed() const {
4015 if (const auto *A = getAttr<EnumExtensibilityAttr>())
4016 return A->getExtensibility() == EnumExtensibilityAttr::Closed;
4020 bool EnumDecl::isClosedFlag() const {
4021 return isClosed() && hasAttr<FlagEnumAttr>();
4024 bool EnumDecl::isClosedNonFlag() const {
4025 return isClosed() && !hasAttr<FlagEnumAttr>();
4028 TemplateSpecializationKind EnumDecl::getTemplateSpecializationKind() const {
4029 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
4030 return MSI->getTemplateSpecializationKind();
4032 return TSK_Undeclared;
4035 void EnumDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
4036 SourceLocation PointOfInstantiation) {
4037 MemberSpecializationInfo *MSI = getMemberSpecializationInfo();
4038 assert(MSI && "Not an instantiated member enumeration?");
4039 MSI->setTemplateSpecializationKind(TSK);
4040 if (TSK != TSK_ExplicitSpecialization &&
4041 PointOfInstantiation.isValid() &&
4042 MSI->getPointOfInstantiation().isInvalid())
4043 MSI->setPointOfInstantiation(PointOfInstantiation);
4046 EnumDecl *EnumDecl::getTemplateInstantiationPattern() const {
4047 if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo()) {
4048 if (isTemplateInstantiation(MSInfo->getTemplateSpecializationKind())) {
4049 EnumDecl *ED = getInstantiatedFromMemberEnum();
4050 while (auto *NewED = ED->getInstantiatedFromMemberEnum())
4052 return getDefinitionOrSelf(ED);
4056 assert(!isTemplateInstantiation(getTemplateSpecializationKind()) &&
4057 "couldn't find pattern for enum instantiation");
4061 EnumDecl *EnumDecl::getInstantiatedFromMemberEnum() const {
4062 if (SpecializationInfo)
4063 return cast<EnumDecl>(SpecializationInfo->getInstantiatedFrom());
4068 void EnumDecl::setInstantiationOfMemberEnum(ASTContext &C, EnumDecl *ED,
4069 TemplateSpecializationKind TSK) {
4070 assert(!SpecializationInfo && "Member enum is already a specialization");
4071 SpecializationInfo = new (C) MemberSpecializationInfo(ED, TSK);
4074 unsigned EnumDecl::getODRHash() {
4079 Hash.AddEnumDecl(this);
4080 setHasODRHash(true);
4081 ODRHash = Hash.CalculateHash();
4085 //===----------------------------------------------------------------------===//
4086 // RecordDecl Implementation
4087 //===----------------------------------------------------------------------===//
4089 RecordDecl::RecordDecl(Kind DK, TagKind TK, const ASTContext &C,
4090 DeclContext *DC, SourceLocation StartLoc,
4091 SourceLocation IdLoc, IdentifierInfo *Id,
4092 RecordDecl *PrevDecl)
4093 : TagDecl(DK, TK, C, DC, IdLoc, Id, PrevDecl, StartLoc) {
4094 assert(classof(static_cast<Decl *>(this)) && "Invalid Kind!");
4095 setHasFlexibleArrayMember(false);
4096 setAnonymousStructOrUnion(false);
4097 setHasObjectMember(false);
4098 setHasVolatileMember(false);
4099 setHasLoadedFieldsFromExternalStorage(false);
4100 setNonTrivialToPrimitiveDefaultInitialize(false);
4101 setNonTrivialToPrimitiveCopy(false);
4102 setNonTrivialToPrimitiveDestroy(false);
4103 setParamDestroyedInCallee(false);
4104 setArgPassingRestrictions(APK_CanPassInRegs);
4107 RecordDecl *RecordDecl::Create(const ASTContext &C, TagKind TK, DeclContext *DC,
4108 SourceLocation StartLoc, SourceLocation IdLoc,
4109 IdentifierInfo *Id, RecordDecl* PrevDecl) {
4110 RecordDecl *R = new (C, DC) RecordDecl(Record, TK, C, DC,
4111 StartLoc, IdLoc, Id, PrevDecl);
4112 R->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4114 C.getTypeDeclType(R, PrevDecl);
4118 RecordDecl *RecordDecl::CreateDeserialized(const ASTContext &C, unsigned ID) {
4120 new (C, ID) RecordDecl(Record, TTK_Struct, C, nullptr, SourceLocation(),
4121 SourceLocation(), nullptr, nullptr);
4122 R->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4126 bool RecordDecl::isInjectedClassName() const {
4127 return isImplicit() && getDeclName() && getDeclContext()->isRecord() &&
4128 cast<RecordDecl>(getDeclContext())->getDeclName() == getDeclName();
4131 bool RecordDecl::isLambda() const {
4132 if (auto RD = dyn_cast<CXXRecordDecl>(this))
4133 return RD->isLambda();
4137 bool RecordDecl::isCapturedRecord() const {
4138 return hasAttr<CapturedRecordAttr>();
4141 void RecordDecl::setCapturedRecord() {
4142 addAttr(CapturedRecordAttr::CreateImplicit(getASTContext()));
4145 RecordDecl::field_iterator RecordDecl::field_begin() const {
4146 if (hasExternalLexicalStorage() && !hasLoadedFieldsFromExternalStorage())
4147 LoadFieldsFromExternalStorage();
4149 return field_iterator(decl_iterator(FirstDecl));
4152 /// completeDefinition - Notes that the definition of this type is now
4154 void RecordDecl::completeDefinition() {
4155 assert(!isCompleteDefinition() && "Cannot redefine record!");
4156 TagDecl::completeDefinition();
4159 /// isMsStruct - Get whether or not this record uses ms_struct layout.
4160 /// This which can be turned on with an attribute, pragma, or the
4161 /// -mms-bitfields command-line option.
4162 bool RecordDecl::isMsStruct(const ASTContext &C) const {
4163 return hasAttr<MSStructAttr>() || C.getLangOpts().MSBitfields == 1;
4166 void RecordDecl::LoadFieldsFromExternalStorage() const {
4167 ExternalASTSource *Source = getASTContext().getExternalSource();
4168 assert(hasExternalLexicalStorage() && Source && "No external storage?");
4170 // Notify that we have a RecordDecl doing some initialization.
4171 ExternalASTSource::Deserializing TheFields(Source);
4173 SmallVector<Decl*, 64> Decls;
4174 setHasLoadedFieldsFromExternalStorage(true);
4175 Source->FindExternalLexicalDecls(this, [](Decl::Kind K) {
4176 return FieldDecl::classofKind(K) || IndirectFieldDecl::classofKind(K);
4180 // Check that all decls we got were FieldDecls.
4181 for (unsigned i=0, e=Decls.size(); i != e; ++i)
4182 assert(isa<FieldDecl>(Decls[i]) || isa<IndirectFieldDecl>(Decls[i]));
4188 std::tie(FirstDecl, LastDecl) = BuildDeclChain(Decls,
4189 /*FieldsAlreadyLoaded=*/false);
4192 bool RecordDecl::mayInsertExtraPadding(bool EmitRemark) const {
4193 ASTContext &Context = getASTContext();
4194 const SanitizerMask EnabledAsanMask = Context.getLangOpts().Sanitize.Mask &
4195 (SanitizerKind::Address | SanitizerKind::KernelAddress);
4196 if (!EnabledAsanMask || !Context.getLangOpts().SanitizeAddressFieldPadding)
4198 const auto &Blacklist = Context.getSanitizerBlacklist();
4199 const auto *CXXRD = dyn_cast<CXXRecordDecl>(this);
4200 // We may be able to relax some of these requirements.
4201 int ReasonToReject = -1;
4202 if (!CXXRD || CXXRD->isExternCContext())
4203 ReasonToReject = 0; // is not C++.
4204 else if (CXXRD->hasAttr<PackedAttr>())
4205 ReasonToReject = 1; // is packed.
4206 else if (CXXRD->isUnion())
4207 ReasonToReject = 2; // is a union.
4208 else if (CXXRD->isTriviallyCopyable())
4209 ReasonToReject = 3; // is trivially copyable.
4210 else if (CXXRD->hasTrivialDestructor())
4211 ReasonToReject = 4; // has trivial destructor.
4212 else if (CXXRD->isStandardLayout())
4213 ReasonToReject = 5; // is standard layout.
4214 else if (Blacklist.isBlacklistedLocation(EnabledAsanMask, getLocation(),
4216 ReasonToReject = 6; // is in a blacklisted file.
4217 else if (Blacklist.isBlacklistedType(EnabledAsanMask,
4218 getQualifiedNameAsString(),
4220 ReasonToReject = 7; // is blacklisted.
4223 if (ReasonToReject >= 0)
4224 Context.getDiagnostics().Report(
4226 diag::remark_sanitize_address_insert_extra_padding_rejected)
4227 << getQualifiedNameAsString() << ReasonToReject;
4229 Context.getDiagnostics().Report(
4231 diag::remark_sanitize_address_insert_extra_padding_accepted)
4232 << getQualifiedNameAsString();
4234 return ReasonToReject < 0;
4237 const FieldDecl *RecordDecl::findFirstNamedDataMember() const {
4238 for (const auto *I : fields()) {
4239 if (I->getIdentifier())
4242 if (const auto *RT = I->getType()->getAs<RecordType>())
4243 if (const FieldDecl *NamedDataMember =
4244 RT->getDecl()->findFirstNamedDataMember())
4245 return NamedDataMember;
4248 // We didn't find a named data member.
4252 //===----------------------------------------------------------------------===//
4253 // BlockDecl Implementation
4254 //===----------------------------------------------------------------------===//
4256 BlockDecl::BlockDecl(DeclContext *DC, SourceLocation CaretLoc)
4257 : Decl(Block, DC, CaretLoc), DeclContext(Block) {
4258 setIsVariadic(false);
4259 setCapturesCXXThis(false);
4260 setBlockMissingReturnType(true);
4261 setIsConversionFromLambda(false);
4262 setDoesNotEscape(false);
4265 void BlockDecl::setParams(ArrayRef<ParmVarDecl *> NewParamInfo) {
4266 assert(!ParamInfo && "Already has param info!");
4268 // Zero params -> null pointer.
4269 if (!NewParamInfo.empty()) {
4270 NumParams = NewParamInfo.size();
4271 ParamInfo = new (getASTContext()) ParmVarDecl*[NewParamInfo.size()];
4272 std::copy(NewParamInfo.begin(), NewParamInfo.end(), ParamInfo);
4276 void BlockDecl::setCaptures(ASTContext &Context, ArrayRef<Capture> Captures,
4277 bool CapturesCXXThis) {
4278 this->setCapturesCXXThis(CapturesCXXThis);
4279 this->NumCaptures = Captures.size();
4281 if (Captures.empty()) {
4282 this->Captures = nullptr;
4286 this->Captures = Captures.copy(Context).data();
4289 bool BlockDecl::capturesVariable(const VarDecl *variable) const {
4290 for (const auto &I : captures())
4291 // Only auto vars can be captured, so no redeclaration worries.
4292 if (I.getVariable() == variable)
4298 SourceRange BlockDecl::getSourceRange() const {
4299 return SourceRange(getLocation(), Body ? Body->getEndLoc() : getLocation());
4302 //===----------------------------------------------------------------------===//
4303 // Other Decl Allocation/Deallocation Method Implementations
4304 //===----------------------------------------------------------------------===//
4306 void TranslationUnitDecl::anchor() {}
4308 TranslationUnitDecl *TranslationUnitDecl::Create(ASTContext &C) {
4309 return new (C, (DeclContext *)nullptr) TranslationUnitDecl(C);
4312 void PragmaCommentDecl::anchor() {}
4314 PragmaCommentDecl *PragmaCommentDecl::Create(const ASTContext &C,
4315 TranslationUnitDecl *DC,
4316 SourceLocation CommentLoc,
4317 PragmaMSCommentKind CommentKind,
4319 PragmaCommentDecl *PCD =
4320 new (C, DC, additionalSizeToAlloc<char>(Arg.size() + 1))
4321 PragmaCommentDecl(DC, CommentLoc, CommentKind);
4322 memcpy(PCD->getTrailingObjects<char>(), Arg.data(), Arg.size());
4323 PCD->getTrailingObjects<char>()[Arg.size()] = '\0';
4327 PragmaCommentDecl *PragmaCommentDecl::CreateDeserialized(ASTContext &C,
4330 return new (C, ID, additionalSizeToAlloc<char>(ArgSize + 1))
4331 PragmaCommentDecl(nullptr, SourceLocation(), PCK_Unknown);
4334 void PragmaDetectMismatchDecl::anchor() {}
4336 PragmaDetectMismatchDecl *
4337 PragmaDetectMismatchDecl::Create(const ASTContext &C, TranslationUnitDecl *DC,
4338 SourceLocation Loc, StringRef Name,
4340 size_t ValueStart = Name.size() + 1;
4341 PragmaDetectMismatchDecl *PDMD =
4342 new (C, DC, additionalSizeToAlloc<char>(ValueStart + Value.size() + 1))
4343 PragmaDetectMismatchDecl(DC, Loc, ValueStart);
4344 memcpy(PDMD->getTrailingObjects<char>(), Name.data(), Name.size());
4345 PDMD->getTrailingObjects<char>()[Name.size()] = '\0';
4346 memcpy(PDMD->getTrailingObjects<char>() + ValueStart, Value.data(),
4348 PDMD->getTrailingObjects<char>()[ValueStart + Value.size()] = '\0';
4352 PragmaDetectMismatchDecl *
4353 PragmaDetectMismatchDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4354 unsigned NameValueSize) {
4355 return new (C, ID, additionalSizeToAlloc<char>(NameValueSize + 1))
4356 PragmaDetectMismatchDecl(nullptr, SourceLocation(), 0);
4359 void ExternCContextDecl::anchor() {}
4361 ExternCContextDecl *ExternCContextDecl::Create(const ASTContext &C,
4362 TranslationUnitDecl *DC) {
4363 return new (C, DC) ExternCContextDecl(DC);
4366 void LabelDecl::anchor() {}
4368 LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC,
4369 SourceLocation IdentL, IdentifierInfo *II) {
4370 return new (C, DC) LabelDecl(DC, IdentL, II, nullptr, IdentL);
4373 LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC,
4374 SourceLocation IdentL, IdentifierInfo *II,
4375 SourceLocation GnuLabelL) {
4376 assert(GnuLabelL != IdentL && "Use this only for GNU local labels");
4377 return new (C, DC) LabelDecl(DC, IdentL, II, nullptr, GnuLabelL);
4380 LabelDecl *LabelDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4381 return new (C, ID) LabelDecl(nullptr, SourceLocation(), nullptr, nullptr,
4385 void LabelDecl::setMSAsmLabel(StringRef Name) {
4386 char *Buffer = new (getASTContext(), 1) char[Name.size() + 1];
4387 memcpy(Buffer, Name.data(), Name.size());
4388 Buffer[Name.size()] = '\0';
4392 void ValueDecl::anchor() {}
4394 bool ValueDecl::isWeak() const {
4395 for (const auto *I : attrs())
4396 if (isa<WeakAttr>(I) || isa<WeakRefAttr>(I))
4399 return isWeakImported();
4402 void ImplicitParamDecl::anchor() {}
4404 ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, DeclContext *DC,
4405 SourceLocation IdLoc,
4406 IdentifierInfo *Id, QualType Type,
4407 ImplicitParamKind ParamKind) {
4408 return new (C, DC) ImplicitParamDecl(C, DC, IdLoc, Id, Type, ParamKind);
4411 ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, QualType Type,
4412 ImplicitParamKind ParamKind) {
4413 return new (C, nullptr) ImplicitParamDecl(C, Type, ParamKind);
4416 ImplicitParamDecl *ImplicitParamDecl::CreateDeserialized(ASTContext &C,
4418 return new (C, ID) ImplicitParamDecl(C, QualType(), ImplicitParamKind::Other);
4421 FunctionDecl *FunctionDecl::Create(ASTContext &C, DeclContext *DC,
4422 SourceLocation StartLoc,
4423 const DeclarationNameInfo &NameInfo,
4424 QualType T, TypeSourceInfo *TInfo,
4426 bool isInlineSpecified,
4427 bool hasWrittenPrototype,
4428 bool isConstexprSpecified) {
4430 new (C, DC) FunctionDecl(Function, C, DC, StartLoc, NameInfo, T, TInfo,
4431 SC, isInlineSpecified, isConstexprSpecified);
4432 New->setHasWrittenPrototype(hasWrittenPrototype);
4436 FunctionDecl *FunctionDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4437 return new (C, ID) FunctionDecl(Function, C, nullptr, SourceLocation(),
4438 DeclarationNameInfo(), QualType(), nullptr,
4439 SC_None, false, false);
4442 BlockDecl *BlockDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) {
4443 return new (C, DC) BlockDecl(DC, L);
4446 BlockDecl *BlockDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4447 return new (C, ID) BlockDecl(nullptr, SourceLocation());
4450 CapturedDecl::CapturedDecl(DeclContext *DC, unsigned NumParams)
4451 : Decl(Captured, DC, SourceLocation()), DeclContext(Captured),
4452 NumParams(NumParams), ContextParam(0), BodyAndNothrow(nullptr, false) {}
4454 CapturedDecl *CapturedDecl::Create(ASTContext &C, DeclContext *DC,
4455 unsigned NumParams) {
4456 return new (C, DC, additionalSizeToAlloc<ImplicitParamDecl *>(NumParams))
4457 CapturedDecl(DC, NumParams);
4460 CapturedDecl *CapturedDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4461 unsigned NumParams) {
4462 return new (C, ID, additionalSizeToAlloc<ImplicitParamDecl *>(NumParams))
4463 CapturedDecl(nullptr, NumParams);
4466 Stmt *CapturedDecl::getBody() const { return BodyAndNothrow.getPointer(); }
4467 void CapturedDecl::setBody(Stmt *B) { BodyAndNothrow.setPointer(B); }
4469 bool CapturedDecl::isNothrow() const { return BodyAndNothrow.getInt(); }
4470 void CapturedDecl::setNothrow(bool Nothrow) { BodyAndNothrow.setInt(Nothrow); }
4472 EnumConstantDecl *EnumConstantDecl::Create(ASTContext &C, EnumDecl *CD,
4474 IdentifierInfo *Id, QualType T,
4475 Expr *E, const llvm::APSInt &V) {
4476 return new (C, CD) EnumConstantDecl(CD, L, Id, T, E, V);
4480 EnumConstantDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4481 return new (C, ID) EnumConstantDecl(nullptr, SourceLocation(), nullptr,
4482 QualType(), nullptr, llvm::APSInt());
4485 void IndirectFieldDecl::anchor() {}
4487 IndirectFieldDecl::IndirectFieldDecl(ASTContext &C, DeclContext *DC,
4488 SourceLocation L, DeclarationName N,
4490 MutableArrayRef<NamedDecl *> CH)
4491 : ValueDecl(IndirectField, DC, L, N, T), Chaining(CH.data()),
4492 ChainingSize(CH.size()) {
4493 // In C++, indirect field declarations conflict with tag declarations in the
4494 // same scope, so add them to IDNS_Tag so that tag redeclaration finds them.
4495 if (C.getLangOpts().CPlusPlus)
4496 IdentifierNamespace |= IDNS_Tag;
4500 IndirectFieldDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L,
4501 IdentifierInfo *Id, QualType T,
4502 llvm::MutableArrayRef<NamedDecl *> CH) {
4503 return new (C, DC) IndirectFieldDecl(C, DC, L, Id, T, CH);
4506 IndirectFieldDecl *IndirectFieldDecl::CreateDeserialized(ASTContext &C,
4508 return new (C, ID) IndirectFieldDecl(C, nullptr, SourceLocation(),
4509 DeclarationName(), QualType(), None);
4512 SourceRange EnumConstantDecl::getSourceRange() const {
4513 SourceLocation End = getLocation();
4515 End = Init->getEndLoc();
4516 return SourceRange(getLocation(), End);
4519 void TypeDecl::anchor() {}
4521 TypedefDecl *TypedefDecl::Create(ASTContext &C, DeclContext *DC,
4522 SourceLocation StartLoc, SourceLocation IdLoc,
4523 IdentifierInfo *Id, TypeSourceInfo *TInfo) {
4524 return new (C, DC) TypedefDecl(C, DC, StartLoc, IdLoc, Id, TInfo);
4527 void TypedefNameDecl::anchor() {}
4529 TagDecl *TypedefNameDecl::getAnonDeclWithTypedefName(bool AnyRedecl) const {
4530 if (auto *TT = getTypeSourceInfo()->getType()->getAs<TagType>()) {
4531 auto *OwningTypedef = TT->getDecl()->getTypedefNameForAnonDecl();
4532 auto *ThisTypedef = this;
4533 if (AnyRedecl && OwningTypedef) {
4534 OwningTypedef = OwningTypedef->getCanonicalDecl();
4535 ThisTypedef = ThisTypedef->getCanonicalDecl();
4537 if (OwningTypedef == ThisTypedef)
4538 return TT->getDecl();
4544 bool TypedefNameDecl::isTransparentTagSlow() const {
4545 auto determineIsTransparent = [&]() {
4546 if (auto *TT = getUnderlyingType()->getAs<TagType>()) {
4547 if (auto *TD = TT->getDecl()) {
4548 if (TD->getName() != getName())
4550 SourceLocation TTLoc = getLocation();
4551 SourceLocation TDLoc = TD->getLocation();
4552 if (!TTLoc.isMacroID() || !TDLoc.isMacroID())
4554 SourceManager &SM = getASTContext().getSourceManager();
4555 return SM.getSpellingLoc(TTLoc) == SM.getSpellingLoc(TDLoc);
4561 bool isTransparent = determineIsTransparent();
4562 MaybeModedTInfo.setInt((isTransparent << 1) | 1);
4563 return isTransparent;
4566 TypedefDecl *TypedefDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4567 return new (C, ID) TypedefDecl(C, nullptr, SourceLocation(), SourceLocation(),
4571 TypeAliasDecl *TypeAliasDecl::Create(ASTContext &C, DeclContext *DC,
4572 SourceLocation StartLoc,
4573 SourceLocation IdLoc, IdentifierInfo *Id,
4574 TypeSourceInfo *TInfo) {
4575 return new (C, DC) TypeAliasDecl(C, DC, StartLoc, IdLoc, Id, TInfo);
4578 TypeAliasDecl *TypeAliasDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4579 return new (C, ID) TypeAliasDecl(C, nullptr, SourceLocation(),
4580 SourceLocation(), nullptr, nullptr);
4583 SourceRange TypedefDecl::getSourceRange() const {
4584 SourceLocation RangeEnd = getLocation();
4585 if (TypeSourceInfo *TInfo = getTypeSourceInfo()) {
4586 if (typeIsPostfix(TInfo->getType()))
4587 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
4589 return SourceRange(getBeginLoc(), RangeEnd);
4592 SourceRange TypeAliasDecl::getSourceRange() const {
4593 SourceLocation RangeEnd = getBeginLoc();
4594 if (TypeSourceInfo *TInfo = getTypeSourceInfo())
4595 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
4596 return SourceRange(getBeginLoc(), RangeEnd);
4599 void FileScopeAsmDecl::anchor() {}
4601 FileScopeAsmDecl *FileScopeAsmDecl::Create(ASTContext &C, DeclContext *DC,
4603 SourceLocation AsmLoc,
4604 SourceLocation RParenLoc) {
4605 return new (C, DC) FileScopeAsmDecl(DC, Str, AsmLoc, RParenLoc);
4608 FileScopeAsmDecl *FileScopeAsmDecl::CreateDeserialized(ASTContext &C,
4610 return new (C, ID) FileScopeAsmDecl(nullptr, nullptr, SourceLocation(),
4614 void EmptyDecl::anchor() {}
4616 EmptyDecl *EmptyDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) {
4617 return new (C, DC) EmptyDecl(DC, L);
4620 EmptyDecl *EmptyDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4621 return new (C, ID) EmptyDecl(nullptr, SourceLocation());
4624 //===----------------------------------------------------------------------===//
4625 // ImportDecl Implementation
4626 //===----------------------------------------------------------------------===//
4628 /// Retrieve the number of module identifiers needed to name the given
4630 static unsigned getNumModuleIdentifiers(Module *Mod) {
4631 unsigned Result = 1;
4632 while (Mod->Parent) {
4639 ImportDecl::ImportDecl(DeclContext *DC, SourceLocation StartLoc,
4641 ArrayRef<SourceLocation> IdentifierLocs)
4642 : Decl(Import, DC, StartLoc), ImportedAndComplete(Imported, true) {
4643 assert(getNumModuleIdentifiers(Imported) == IdentifierLocs.size());
4644 auto *StoredLocs = getTrailingObjects<SourceLocation>();
4645 std::uninitialized_copy(IdentifierLocs.begin(), IdentifierLocs.end(),
4649 ImportDecl::ImportDecl(DeclContext *DC, SourceLocation StartLoc,
4650 Module *Imported, SourceLocation EndLoc)
4651 : Decl(Import, DC, StartLoc), ImportedAndComplete(Imported, false) {
4652 *getTrailingObjects<SourceLocation>() = EndLoc;
4655 ImportDecl *ImportDecl::Create(ASTContext &C, DeclContext *DC,
4656 SourceLocation StartLoc, Module *Imported,
4657 ArrayRef<SourceLocation> IdentifierLocs) {
4659 additionalSizeToAlloc<SourceLocation>(IdentifierLocs.size()))
4660 ImportDecl(DC, StartLoc, Imported, IdentifierLocs);
4663 ImportDecl *ImportDecl::CreateImplicit(ASTContext &C, DeclContext *DC,
4664 SourceLocation StartLoc,
4666 SourceLocation EndLoc) {
4667 ImportDecl *Import = new (C, DC, additionalSizeToAlloc<SourceLocation>(1))
4668 ImportDecl(DC, StartLoc, Imported, EndLoc);
4669 Import->setImplicit();
4673 ImportDecl *ImportDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4674 unsigned NumLocations) {
4675 return new (C, ID, additionalSizeToAlloc<SourceLocation>(NumLocations))
4676 ImportDecl(EmptyShell());
4679 ArrayRef<SourceLocation> ImportDecl::getIdentifierLocs() const {
4680 if (!ImportedAndComplete.getInt())
4683 const auto *StoredLocs = getTrailingObjects<SourceLocation>();
4684 return llvm::makeArrayRef(StoredLocs,
4685 getNumModuleIdentifiers(getImportedModule()));
4688 SourceRange ImportDecl::getSourceRange() const {
4689 if (!ImportedAndComplete.getInt())
4690 return SourceRange(getLocation(), *getTrailingObjects<SourceLocation>());
4692 return SourceRange(getLocation(), getIdentifierLocs().back());
4695 //===----------------------------------------------------------------------===//
4696 // ExportDecl Implementation
4697 //===----------------------------------------------------------------------===//
4699 void ExportDecl::anchor() {}
4701 ExportDecl *ExportDecl::Create(ASTContext &C, DeclContext *DC,
4702 SourceLocation ExportLoc) {
4703 return new (C, DC) ExportDecl(DC, ExportLoc);
4706 ExportDecl *ExportDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4707 return new (C, ID) ExportDecl(nullptr, SourceLocation());