1 //===- Decl.cpp - Declaration AST Node Implementation ---------------------===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This file implements the Decl subclasses.
11 //===----------------------------------------------------------------------===//
13 #include "clang/AST/Decl.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/ASTDiagnostic.h"
17 #include "clang/AST/ASTLambda.h"
18 #include "clang/AST/ASTMutationListener.h"
19 #include "clang/AST/Attr.h"
20 #include "clang/AST/CanonicalType.h"
21 #include "clang/AST/DeclBase.h"
22 #include "clang/AST/DeclCXX.h"
23 #include "clang/AST/DeclObjC.h"
24 #include "clang/AST/DeclOpenMP.h"
25 #include "clang/AST/DeclTemplate.h"
26 #include "clang/AST/DeclarationName.h"
27 #include "clang/AST/Expr.h"
28 #include "clang/AST/ExprCXX.h"
29 #include "clang/AST/ExternalASTSource.h"
30 #include "clang/AST/ODRHash.h"
31 #include "clang/AST/PrettyDeclStackTrace.h"
32 #include "clang/AST/PrettyPrinter.h"
33 #include "clang/AST/Redeclarable.h"
34 #include "clang/AST/Stmt.h"
35 #include "clang/AST/TemplateBase.h"
36 #include "clang/AST/Type.h"
37 #include "clang/AST/TypeLoc.h"
38 #include "clang/Basic/Builtins.h"
39 #include "clang/Basic/IdentifierTable.h"
40 #include "clang/Basic/LLVM.h"
41 #include "clang/Basic/LangOptions.h"
42 #include "clang/Basic/Linkage.h"
43 #include "clang/Basic/Module.h"
44 #include "clang/Basic/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/StringRef.h"
60 #include "llvm/ADT/StringSwitch.h"
61 #include "llvm/ADT/Triple.h"
62 #include "llvm/Support/Casting.h"
63 #include "llvm/Support/ErrorHandling.h"
64 #include "llvm/Support/raw_ostream.h"
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 /// Determine whether D is declared in the purview of a named module.
572 static bool isInModulePurview(const NamedDecl *D) {
573 if (auto *M = D->getOwningModule())
574 return M->isModulePurview();
578 static bool isExportedFromModuleInterfaceUnit(const NamedDecl *D) {
579 // FIXME: Handle isModulePrivate.
580 switch (D->getModuleOwnershipKind()) {
581 case Decl::ModuleOwnershipKind::Unowned:
582 case Decl::ModuleOwnershipKind::ModulePrivate:
584 case Decl::ModuleOwnershipKind::Visible:
585 case Decl::ModuleOwnershipKind::VisibleWhenImported:
586 return isInModulePurview(D);
588 llvm_unreachable("unexpected module ownership kind");
591 static LinkageInfo getInternalLinkageFor(const NamedDecl *D) {
592 // Internal linkage declarations within a module interface unit are modeled
593 // as "module-internal linkage", which means that they have internal linkage
594 // formally but can be indirectly accessed from outside the module via inline
595 // functions and templates defined within the module.
596 if (isInModulePurview(D))
597 return LinkageInfo(ModuleInternalLinkage, DefaultVisibility, false);
599 return LinkageInfo::internal();
602 static LinkageInfo getExternalLinkageFor(const NamedDecl *D) {
603 // C++ Modules TS [basic.link]/6.8:
604 // - A name declared at namespace scope that does not have internal linkage
605 // by the previous rules and that is introduced by a non-exported
606 // declaration has module linkage.
607 if (isInModulePurview(D) && !isExportedFromModuleInterfaceUnit(
608 cast<NamedDecl>(D->getCanonicalDecl())))
609 return LinkageInfo(ModuleLinkage, DefaultVisibility, false);
611 return LinkageInfo::external();
614 static StorageClass getStorageClass(const Decl *D) {
615 if (auto *TD = dyn_cast<TemplateDecl>(D))
616 D = TD->getTemplatedDecl();
618 if (auto *VD = dyn_cast<VarDecl>(D))
619 return VD->getStorageClass();
620 if (auto *FD = dyn_cast<FunctionDecl>(D))
621 return FD->getStorageClass();
627 LinkageComputer::getLVForNamespaceScopeDecl(const NamedDecl *D,
628 LVComputationKind computation,
629 bool IgnoreVarTypeLinkage) {
630 assert(D->getDeclContext()->getRedeclContext()->isFileContext() &&
631 "Not a name having namespace scope");
632 ASTContext &Context = D->getASTContext();
634 // C++ [basic.link]p3:
635 // A name having namespace scope (3.3.6) has internal linkage if it
638 if (getStorageClass(D->getCanonicalDecl()) == SC_Static) {
639 // - a variable, variable template, function, or function template
640 // that is explicitly declared static; or
641 // (This bullet corresponds to C99 6.2.2p3.)
642 return getInternalLinkageFor(D);
645 if (const auto *Var = dyn_cast<VarDecl>(D)) {
646 // - a non-template variable of non-volatile const-qualified type, unless
647 // - it is explicitly declared extern, or
648 // - it is inline or exported, or
649 // - it was previously declared and the prior declaration did not have
651 // (There is no equivalent in C99.)
652 if (Context.getLangOpts().CPlusPlus &&
653 Var->getType().isConstQualified() &&
654 !Var->getType().isVolatileQualified() &&
656 !isExportedFromModuleInterfaceUnit(Var) &&
657 !isa<VarTemplateSpecializationDecl>(Var) &&
658 !Var->getDescribedVarTemplate()) {
659 const VarDecl *PrevVar = Var->getPreviousDecl();
661 return getLVForDecl(PrevVar, computation);
663 if (Var->getStorageClass() != SC_Extern &&
664 Var->getStorageClass() != SC_PrivateExtern &&
665 !isSingleLineLanguageLinkage(*Var))
666 return getInternalLinkageFor(Var);
669 for (const VarDecl *PrevVar = Var->getPreviousDecl(); PrevVar;
670 PrevVar = PrevVar->getPreviousDecl()) {
671 if (PrevVar->getStorageClass() == SC_PrivateExtern &&
672 Var->getStorageClass() == SC_None)
673 return getDeclLinkageAndVisibility(PrevVar);
674 // Explicitly declared static.
675 if (PrevVar->getStorageClass() == SC_Static)
676 return getInternalLinkageFor(Var);
678 } else if (const auto *IFD = dyn_cast<IndirectFieldDecl>(D)) {
679 // - a data member of an anonymous union.
680 const VarDecl *VD = IFD->getVarDecl();
681 assert(VD && "Expected a VarDecl in this IndirectFieldDecl!");
682 return getLVForNamespaceScopeDecl(VD, computation, IgnoreVarTypeLinkage);
684 assert(!isa<FieldDecl>(D) && "Didn't expect a FieldDecl!");
686 // FIXME: This gives internal linkage to names that should have no linkage
687 // (those not covered by [basic.link]p6).
688 if (D->isInAnonymousNamespace()) {
689 const auto *Var = dyn_cast<VarDecl>(D);
690 const auto *Func = dyn_cast<FunctionDecl>(D);
691 // FIXME: The check for extern "C" here is not justified by the standard
692 // wording, but we retain it from the pre-DR1113 model to avoid breaking
695 // C++11 [basic.link]p4:
696 // An unnamed namespace or a namespace declared directly or indirectly
697 // within an unnamed namespace has internal linkage.
698 if ((!Var || !isFirstInExternCContext(Var)) &&
699 (!Func || !isFirstInExternCContext(Func)))
700 return getInternalLinkageFor(D);
703 // Set up the defaults.
706 // If the declaration of an identifier for an object has file
707 // scope and no storage-class specifier, its linkage is
709 LinkageInfo LV = getExternalLinkageFor(D);
711 if (!hasExplicitVisibilityAlready(computation)) {
712 if (Optional<Visibility> Vis = getExplicitVisibility(D, computation)) {
713 LV.mergeVisibility(*Vis, true);
715 // If we're declared in a namespace with a visibility attribute,
716 // use that namespace's visibility, and it still counts as explicit.
717 for (const DeclContext *DC = D->getDeclContext();
718 !isa<TranslationUnitDecl>(DC);
719 DC = DC->getParent()) {
720 const auto *ND = dyn_cast<NamespaceDecl>(DC);
722 if (Optional<Visibility> Vis = getExplicitVisibility(ND, computation)) {
723 LV.mergeVisibility(*Vis, true);
729 // Add in global settings if the above didn't give us direct visibility.
730 if (!LV.isVisibilityExplicit()) {
731 // Use global type/value visibility as appropriate.
732 Visibility globalVisibility =
733 computation.isValueVisibility()
734 ? Context.getLangOpts().getValueVisibilityMode()
735 : Context.getLangOpts().getTypeVisibilityMode();
736 LV.mergeVisibility(globalVisibility, /*explicit*/ false);
738 // If we're paying attention to global visibility, apply
739 // -finline-visibility-hidden if this is an inline method.
740 if (useInlineVisibilityHidden(D))
741 LV.mergeVisibility(HiddenVisibility, /*visibilityExplicit=*/false);
745 // C++ [basic.link]p4:
747 // A name having namespace scope that has not been given internal linkage
748 // above and that is the name of
750 // has its linkage determined as follows:
751 // - if the enclosing namespace has internal linkage, the name has
752 // internal linkage; [handled above]
753 // - otherwise, if the declaration of the name is attached to a named
754 // module and is not exported, the name has module linkage;
755 // - otherwise, the name has external linkage.
756 // LV is currently set up to handle the last two bullets.
761 if (const auto *Var = dyn_cast<VarDecl>(D)) {
762 // GCC applies the following optimization to variables and static
763 // data members, but not to functions:
765 // Modify the variable's LV by the LV of its type unless this is
766 // C or extern "C". This follows from [basic.link]p9:
767 // A type without linkage shall not be used as the type of a
768 // variable or function with external linkage unless
769 // - the entity has C language linkage, or
770 // - the entity is declared within an unnamed namespace, or
771 // - the entity is not used or is defined in the same
773 // and [basic.link]p10:
774 // ...the types specified by all declarations referring to a
775 // given variable or function shall be identical...
776 // C does not have an equivalent rule.
778 // Ignore this if we've got an explicit attribute; the user
779 // probably knows what they're doing.
781 // Note that we don't want to make the variable non-external
782 // because of this, but unique-external linkage suits us.
783 if (Context.getLangOpts().CPlusPlus && !isFirstInExternCContext(Var) &&
784 !IgnoreVarTypeLinkage) {
785 LinkageInfo TypeLV = getLVForType(*Var->getType(), computation);
786 if (!isExternallyVisible(TypeLV.getLinkage()))
787 return LinkageInfo::uniqueExternal();
788 if (!LV.isVisibilityExplicit())
789 LV.mergeVisibility(TypeLV);
792 if (Var->getStorageClass() == SC_PrivateExtern)
793 LV.mergeVisibility(HiddenVisibility, true);
795 // Note that Sema::MergeVarDecl already takes care of implementing
796 // C99 6.2.2p4 and propagating the visibility attribute, so we don't have
799 // As per function and class template specializations (below),
800 // consider LV for the template and template arguments. We're at file
801 // scope, so we do not need to worry about nested specializations.
802 if (const auto *spec = dyn_cast<VarTemplateSpecializationDecl>(Var)) {
803 mergeTemplateLV(LV, spec, computation);
807 } else if (const auto *Function = dyn_cast<FunctionDecl>(D)) {
808 // In theory, we can modify the function's LV by the LV of its
809 // type unless it has C linkage (see comment above about variables
810 // for justification). In practice, GCC doesn't do this, so it's
811 // just too painful to make work.
813 if (Function->getStorageClass() == SC_PrivateExtern)
814 LV.mergeVisibility(HiddenVisibility, true);
816 // Note that Sema::MergeCompatibleFunctionDecls already takes care of
817 // merging storage classes and visibility attributes, so we don't have to
818 // look at previous decls in here.
820 // In C++, then if the type of the function uses a type with
821 // unique-external linkage, it's not legally usable from outside
822 // this translation unit. However, we should use the C linkage
823 // rules instead for extern "C" declarations.
824 if (Context.getLangOpts().CPlusPlus && !isFirstInExternCContext(Function)) {
825 // Only look at the type-as-written. Otherwise, deducing the return type
826 // of a function could change its linkage.
827 QualType TypeAsWritten = Function->getType();
828 if (TypeSourceInfo *TSI = Function->getTypeSourceInfo())
829 TypeAsWritten = TSI->getType();
830 if (!isExternallyVisible(TypeAsWritten->getLinkage()))
831 return LinkageInfo::uniqueExternal();
834 // Consider LV from the template and the template arguments.
835 // We're at file scope, so we do not need to worry about nested
837 if (FunctionTemplateSpecializationInfo *specInfo
838 = Function->getTemplateSpecializationInfo()) {
839 mergeTemplateLV(LV, Function, specInfo, computation);
842 // - a named class (Clause 9), or an unnamed class defined in a
843 // typedef declaration in which the class has the typedef name
844 // for linkage purposes (7.1.3); or
845 // - a named enumeration (7.2), or an unnamed enumeration
846 // defined in a typedef declaration in which the enumeration
847 // has the typedef name for linkage purposes (7.1.3); or
848 } else if (const auto *Tag = dyn_cast<TagDecl>(D)) {
849 // Unnamed tags have no linkage.
850 if (!Tag->hasNameForLinkage())
851 return LinkageInfo::none();
853 // If this is a class template specialization, consider the
854 // linkage of the template and template arguments. We're at file
855 // scope, so we do not need to worry about nested specializations.
856 if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(Tag)) {
857 mergeTemplateLV(LV, spec, computation);
860 // FIXME: This is not part of the C++ standard any more.
861 // - an enumerator belonging to an enumeration with external linkage; or
862 } else if (isa<EnumConstantDecl>(D)) {
863 LinkageInfo EnumLV = getLVForDecl(cast<NamedDecl>(D->getDeclContext()),
865 if (!isExternalFormalLinkage(EnumLV.getLinkage()))
866 return LinkageInfo::none();
870 } else if (const auto *temp = dyn_cast<TemplateDecl>(D)) {
871 bool considerVisibility = !hasExplicitVisibilityAlready(computation);
873 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
874 LV.mergeMaybeWithVisibility(tempLV, considerVisibility);
876 // An unnamed namespace or a namespace declared directly or indirectly
877 // within an unnamed namespace has internal linkage. All other namespaces
878 // have external linkage.
880 // We handled names in anonymous namespaces above.
881 } else if (isa<NamespaceDecl>(D)) {
884 // By extension, we assign external linkage to Objective-C
886 } else if (isa<ObjCInterfaceDecl>(D)) {
889 } else if (auto *TD = dyn_cast<TypedefNameDecl>(D)) {
890 // A typedef declaration has linkage if it gives a type a name for
892 if (!TD->getAnonDeclWithTypedefName(/*AnyRedecl*/true))
893 return LinkageInfo::none();
895 } else if (isa<MSGuidDecl>(D)) {
896 // A GUID behaves like an inline variable with external linkage. Fall
899 // Everything not covered here has no linkage.
901 return LinkageInfo::none();
904 // If we ended up with non-externally-visible linkage, visibility should
905 // always be default.
906 if (!isExternallyVisible(LV.getLinkage()))
907 return LinkageInfo(LV.getLinkage(), DefaultVisibility, false);
909 // Mark the symbols as hidden when compiling for the device.
910 if (Context.getLangOpts().OpenMP && Context.getLangOpts().OpenMPIsDevice)
911 LV.mergeVisibility(HiddenVisibility, /*newExplicit=*/false);
917 LinkageComputer::getLVForClassMember(const NamedDecl *D,
918 LVComputationKind computation,
919 bool IgnoreVarTypeLinkage) {
920 // Only certain class members have linkage. Note that fields don't
921 // really have linkage, but it's convenient to say they do for the
922 // purposes of calculating linkage of pointer-to-data-member
923 // template arguments.
925 // Templates also don't officially have linkage, but since we ignore
926 // the C++ standard and look at template arguments when determining
927 // linkage and visibility of a template specialization, we might hit
928 // a template template argument that way. If we do, we need to
929 // consider its linkage.
930 if (!(isa<CXXMethodDecl>(D) ||
933 isa<IndirectFieldDecl>(D) ||
935 isa<TemplateDecl>(D)))
936 return LinkageInfo::none();
940 // If we have an explicit visibility attribute, merge that in.
941 if (!hasExplicitVisibilityAlready(computation)) {
942 if (Optional<Visibility> Vis = getExplicitVisibility(D, computation))
943 LV.mergeVisibility(*Vis, true);
944 // If we're paying attention to global visibility, apply
945 // -finline-visibility-hidden if this is an inline method.
947 // Note that we do this before merging information about
948 // the class visibility.
949 if (!LV.isVisibilityExplicit() && useInlineVisibilityHidden(D))
950 LV.mergeVisibility(HiddenVisibility, /*visibilityExplicit=*/false);
953 // If this class member has an explicit visibility attribute, the only
954 // thing that can change its visibility is the template arguments, so
955 // only look for them when processing the class.
956 LVComputationKind classComputation = computation;
957 if (LV.isVisibilityExplicit())
958 classComputation = withExplicitVisibilityAlready(computation);
960 LinkageInfo classLV =
961 getLVForDecl(cast<RecordDecl>(D->getDeclContext()), classComputation);
962 // The member has the same linkage as the class. If that's not externally
963 // visible, we don't need to compute anything about the linkage.
964 // FIXME: If we're only computing linkage, can we bail out here?
965 if (!isExternallyVisible(classLV.getLinkage()))
969 // Otherwise, don't merge in classLV yet, because in certain cases
970 // we need to completely ignore the visibility from it.
972 // Specifically, if this decl exists and has an explicit attribute.
973 const NamedDecl *explicitSpecSuppressor = nullptr;
975 if (const auto *MD = dyn_cast<CXXMethodDecl>(D)) {
976 // Only look at the type-as-written. Otherwise, deducing the return type
977 // of a function could change its linkage.
978 QualType TypeAsWritten = MD->getType();
979 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo())
980 TypeAsWritten = TSI->getType();
981 if (!isExternallyVisible(TypeAsWritten->getLinkage()))
982 return LinkageInfo::uniqueExternal();
984 // If this is a method template specialization, use the linkage for
985 // the template parameters and arguments.
986 if (FunctionTemplateSpecializationInfo *spec
987 = MD->getTemplateSpecializationInfo()) {
988 mergeTemplateLV(LV, MD, spec, computation);
989 if (spec->isExplicitSpecialization()) {
990 explicitSpecSuppressor = MD;
991 } else if (isExplicitMemberSpecialization(spec->getTemplate())) {
992 explicitSpecSuppressor = spec->getTemplate()->getTemplatedDecl();
994 } else if (isExplicitMemberSpecialization(MD)) {
995 explicitSpecSuppressor = MD;
998 } else if (const auto *RD = dyn_cast<CXXRecordDecl>(D)) {
999 if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(RD)) {
1000 mergeTemplateLV(LV, spec, computation);
1001 if (spec->isExplicitSpecialization()) {
1002 explicitSpecSuppressor = spec;
1004 const ClassTemplateDecl *temp = spec->getSpecializedTemplate();
1005 if (isExplicitMemberSpecialization(temp)) {
1006 explicitSpecSuppressor = temp->getTemplatedDecl();
1009 } else if (isExplicitMemberSpecialization(RD)) {
1010 explicitSpecSuppressor = RD;
1013 // Static data members.
1014 } else if (const auto *VD = dyn_cast<VarDecl>(D)) {
1015 if (const auto *spec = dyn_cast<VarTemplateSpecializationDecl>(VD))
1016 mergeTemplateLV(LV, spec, computation);
1018 // Modify the variable's linkage by its type, but ignore the
1019 // type's visibility unless it's a definition.
1020 if (!IgnoreVarTypeLinkage) {
1021 LinkageInfo typeLV = getLVForType(*VD->getType(), computation);
1022 // FIXME: If the type's linkage is not externally visible, we can
1023 // give this static data member UniqueExternalLinkage.
1024 if (!LV.isVisibilityExplicit() && !classLV.isVisibilityExplicit())
1025 LV.mergeVisibility(typeLV);
1026 LV.mergeExternalVisibility(typeLV);
1029 if (isExplicitMemberSpecialization(VD)) {
1030 explicitSpecSuppressor = VD;
1033 // Template members.
1034 } else if (const auto *temp = dyn_cast<TemplateDecl>(D)) {
1035 bool considerVisibility =
1036 (!LV.isVisibilityExplicit() &&
1037 !classLV.isVisibilityExplicit() &&
1038 !hasExplicitVisibilityAlready(computation));
1039 LinkageInfo tempLV =
1040 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
1041 LV.mergeMaybeWithVisibility(tempLV, considerVisibility);
1043 if (const auto *redeclTemp = dyn_cast<RedeclarableTemplateDecl>(temp)) {
1044 if (isExplicitMemberSpecialization(redeclTemp)) {
1045 explicitSpecSuppressor = temp->getTemplatedDecl();
1050 // We should never be looking for an attribute directly on a template.
1051 assert(!explicitSpecSuppressor || !isa<TemplateDecl>(explicitSpecSuppressor));
1053 // If this member is an explicit member specialization, and it has
1054 // an explicit attribute, ignore visibility from the parent.
1055 bool considerClassVisibility = true;
1056 if (explicitSpecSuppressor &&
1057 // optimization: hasDVA() is true only with explicit visibility.
1058 LV.isVisibilityExplicit() &&
1059 classLV.getVisibility() != DefaultVisibility &&
1060 hasDirectVisibilityAttribute(explicitSpecSuppressor, computation)) {
1061 considerClassVisibility = false;
1064 // Finally, merge in information from the class.
1065 LV.mergeMaybeWithVisibility(classLV, considerClassVisibility);
1069 void NamedDecl::anchor() {}
1071 bool NamedDecl::isLinkageValid() const {
1072 if (!hasCachedLinkage())
1075 Linkage L = LinkageComputer{}
1076 .computeLVForDecl(this, LVComputationKind::forLinkageOnly())
1078 return L == getCachedLinkage();
1081 ObjCStringFormatFamily NamedDecl::getObjCFStringFormattingFamily() const {
1082 StringRef name = getName();
1083 if (name.empty()) return SFF_None;
1085 if (name.front() == 'C')
1086 if (name == "CFStringCreateWithFormat" ||
1087 name == "CFStringCreateWithFormatAndArguments" ||
1088 name == "CFStringAppendFormat" ||
1089 name == "CFStringAppendFormatAndArguments")
1090 return SFF_CFString;
1094 Linkage NamedDecl::getLinkageInternal() const {
1095 // We don't care about visibility here, so ask for the cheapest
1096 // possible visibility analysis.
1097 return LinkageComputer{}
1098 .getLVForDecl(this, LVComputationKind::forLinkageOnly())
1102 LinkageInfo NamedDecl::getLinkageAndVisibility() const {
1103 return LinkageComputer{}.getDeclLinkageAndVisibility(this);
1106 static Optional<Visibility>
1107 getExplicitVisibilityAux(const NamedDecl *ND,
1108 NamedDecl::ExplicitVisibilityKind kind,
1109 bool IsMostRecent) {
1110 assert(!IsMostRecent || ND == ND->getMostRecentDecl());
1112 // Check the declaration itself first.
1113 if (Optional<Visibility> V = getVisibilityOf(ND, kind))
1116 // If this is a member class of a specialization of a class template
1117 // and the corresponding decl has explicit visibility, use that.
1118 if (const auto *RD = dyn_cast<CXXRecordDecl>(ND)) {
1119 CXXRecordDecl *InstantiatedFrom = RD->getInstantiatedFromMemberClass();
1120 if (InstantiatedFrom)
1121 return getVisibilityOf(InstantiatedFrom, kind);
1124 // If there wasn't explicit visibility there, and this is a
1125 // specialization of a class template, check for visibility
1127 if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(ND)) {
1128 // Walk all the template decl till this point to see if there are
1129 // explicit visibility attributes.
1130 const auto *TD = spec->getSpecializedTemplate()->getTemplatedDecl();
1131 while (TD != nullptr) {
1132 auto Vis = getVisibilityOf(TD, kind);
1135 TD = TD->getPreviousDecl();
1140 // Use the most recent declaration.
1141 if (!IsMostRecent && !isa<NamespaceDecl>(ND)) {
1142 const NamedDecl *MostRecent = ND->getMostRecentDecl();
1143 if (MostRecent != ND)
1144 return getExplicitVisibilityAux(MostRecent, kind, true);
1147 if (const auto *Var = dyn_cast<VarDecl>(ND)) {
1148 if (Var->isStaticDataMember()) {
1149 VarDecl *InstantiatedFrom = Var->getInstantiatedFromStaticDataMember();
1150 if (InstantiatedFrom)
1151 return getVisibilityOf(InstantiatedFrom, kind);
1154 if (const auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(Var))
1155 return getVisibilityOf(VTSD->getSpecializedTemplate()->getTemplatedDecl(),
1160 // Also handle function template specializations.
1161 if (const auto *fn = dyn_cast<FunctionDecl>(ND)) {
1162 // If the function is a specialization of a template with an
1163 // explicit visibility attribute, use that.
1164 if (FunctionTemplateSpecializationInfo *templateInfo
1165 = fn->getTemplateSpecializationInfo())
1166 return getVisibilityOf(templateInfo->getTemplate()->getTemplatedDecl(),
1169 // If the function is a member of a specialization of a class template
1170 // and the corresponding decl has explicit visibility, use that.
1171 FunctionDecl *InstantiatedFrom = fn->getInstantiatedFromMemberFunction();
1172 if (InstantiatedFrom)
1173 return getVisibilityOf(InstantiatedFrom, kind);
1178 // The visibility of a template is stored in the templated decl.
1179 if (const auto *TD = dyn_cast<TemplateDecl>(ND))
1180 return getVisibilityOf(TD->getTemplatedDecl(), kind);
1185 Optional<Visibility>
1186 NamedDecl::getExplicitVisibility(ExplicitVisibilityKind kind) const {
1187 return getExplicitVisibilityAux(this, kind, false);
1190 LinkageInfo LinkageComputer::getLVForClosure(const DeclContext *DC,
1192 LVComputationKind computation) {
1193 // This lambda has its linkage/visibility determined by its owner.
1194 const NamedDecl *Owner;
1196 Owner = dyn_cast<NamedDecl>(DC);
1197 else if (isa<ParmVarDecl>(ContextDecl))
1199 dyn_cast<NamedDecl>(ContextDecl->getDeclContext()->getRedeclContext());
1201 Owner = cast<NamedDecl>(ContextDecl);
1204 return LinkageInfo::none();
1206 // If the owner has a deduced type, we need to skip querying the linkage and
1207 // visibility of that type, because it might involve this closure type. The
1208 // only effect of this is that we might give a lambda VisibleNoLinkage rather
1209 // than NoLinkage when we don't strictly need to, which is benign.
1210 auto *VD = dyn_cast<VarDecl>(Owner);
1211 LinkageInfo OwnerLV =
1212 VD && VD->getType()->getContainedDeducedType()
1213 ? computeLVForDecl(Owner, computation, /*IgnoreVarTypeLinkage*/true)
1214 : getLVForDecl(Owner, computation);
1216 // A lambda never formally has linkage. But if the owner is externally
1217 // visible, then the lambda is too. We apply the same rules to blocks.
1218 if (!isExternallyVisible(OwnerLV.getLinkage()))
1219 return LinkageInfo::none();
1220 return LinkageInfo(VisibleNoLinkage, OwnerLV.getVisibility(),
1221 OwnerLV.isVisibilityExplicit());
1224 LinkageInfo LinkageComputer::getLVForLocalDecl(const NamedDecl *D,
1225 LVComputationKind computation) {
1226 if (const auto *Function = dyn_cast<FunctionDecl>(D)) {
1227 if (Function->isInAnonymousNamespace() &&
1228 !isFirstInExternCContext(Function))
1229 return getInternalLinkageFor(Function);
1231 // This is a "void f();" which got merged with a file static.
1232 if (Function->getCanonicalDecl()->getStorageClass() == SC_Static)
1233 return getInternalLinkageFor(Function);
1236 if (!hasExplicitVisibilityAlready(computation)) {
1237 if (Optional<Visibility> Vis =
1238 getExplicitVisibility(Function, computation))
1239 LV.mergeVisibility(*Vis, true);
1242 // Note that Sema::MergeCompatibleFunctionDecls already takes care of
1243 // merging storage classes and visibility attributes, so we don't have to
1244 // look at previous decls in here.
1249 if (const auto *Var = dyn_cast<VarDecl>(D)) {
1250 if (Var->hasExternalStorage()) {
1251 if (Var->isInAnonymousNamespace() && !isFirstInExternCContext(Var))
1252 return getInternalLinkageFor(Var);
1255 if (Var->getStorageClass() == SC_PrivateExtern)
1256 LV.mergeVisibility(HiddenVisibility, true);
1257 else if (!hasExplicitVisibilityAlready(computation)) {
1258 if (Optional<Visibility> Vis = getExplicitVisibility(Var, computation))
1259 LV.mergeVisibility(*Vis, true);
1262 if (const VarDecl *Prev = Var->getPreviousDecl()) {
1263 LinkageInfo PrevLV = getLVForDecl(Prev, computation);
1264 if (PrevLV.getLinkage())
1265 LV.setLinkage(PrevLV.getLinkage());
1266 LV.mergeVisibility(PrevLV);
1272 if (!Var->isStaticLocal())
1273 return LinkageInfo::none();
1276 ASTContext &Context = D->getASTContext();
1277 if (!Context.getLangOpts().CPlusPlus)
1278 return LinkageInfo::none();
1280 const Decl *OuterD = getOutermostFuncOrBlockContext(D);
1281 if (!OuterD || OuterD->isInvalidDecl())
1282 return LinkageInfo::none();
1285 if (const auto *BD = dyn_cast<BlockDecl>(OuterD)) {
1286 if (!BD->getBlockManglingNumber())
1287 return LinkageInfo::none();
1289 LV = getLVForClosure(BD->getDeclContext()->getRedeclContext(),
1290 BD->getBlockManglingContextDecl(), computation);
1292 const auto *FD = cast<FunctionDecl>(OuterD);
1293 if (!FD->isInlined() &&
1294 !isTemplateInstantiation(FD->getTemplateSpecializationKind()))
1295 return LinkageInfo::none();
1297 // If a function is hidden by -fvisibility-inlines-hidden option and
1298 // is not explicitly attributed as a hidden function,
1299 // we should not make static local variables in the function hidden.
1300 LV = getLVForDecl(FD, computation);
1301 if (isa<VarDecl>(D) && useInlineVisibilityHidden(FD) &&
1302 !LV.isVisibilityExplicit()) {
1303 assert(cast<VarDecl>(D)->isStaticLocal());
1304 // If this was an implicitly hidden inline method, check again for
1305 // explicit visibility on the parent class, and use that for static locals
1307 if (const auto *MD = dyn_cast<CXXMethodDecl>(FD))
1308 LV = getLVForDecl(MD->getParent(), computation);
1309 if (!LV.isVisibilityExplicit()) {
1310 Visibility globalVisibility =
1311 computation.isValueVisibility()
1312 ? Context.getLangOpts().getValueVisibilityMode()
1313 : Context.getLangOpts().getTypeVisibilityMode();
1314 return LinkageInfo(VisibleNoLinkage, globalVisibility,
1315 /*visibilityExplicit=*/false);
1319 if (!isExternallyVisible(LV.getLinkage()))
1320 return LinkageInfo::none();
1321 return LinkageInfo(VisibleNoLinkage, LV.getVisibility(),
1322 LV.isVisibilityExplicit());
1325 LinkageInfo LinkageComputer::computeLVForDecl(const NamedDecl *D,
1326 LVComputationKind computation,
1327 bool IgnoreVarTypeLinkage) {
1328 // Internal_linkage attribute overrides other considerations.
1329 if (D->hasAttr<InternalLinkageAttr>())
1330 return getInternalLinkageFor(D);
1332 // Objective-C: treat all Objective-C declarations as having external
1334 switch (D->getKind()) {
1338 // Per C++ [basic.link]p2, only the names of objects, references,
1339 // functions, types, templates, namespaces, and values ever have linkage.
1341 // Note that the name of a typedef, namespace alias, using declaration,
1342 // and so on are not the name of the corresponding type, namespace, or
1343 // declaration, so they do *not* have linkage.
1344 case Decl::ImplicitParam:
1346 case Decl::NamespaceAlias:
1349 case Decl::UsingShadow:
1350 case Decl::UsingDirective:
1351 return LinkageInfo::none();
1353 case Decl::EnumConstant:
1354 // C++ [basic.link]p4: an enumerator has the linkage of its enumeration.
1355 if (D->getASTContext().getLangOpts().CPlusPlus)
1356 return getLVForDecl(cast<EnumDecl>(D->getDeclContext()), computation);
1357 return LinkageInfo::visible_none();
1360 case Decl::TypeAlias:
1361 // A typedef declaration has linkage if it gives a type a name for
1362 // linkage purposes.
1363 if (!cast<TypedefNameDecl>(D)
1364 ->getAnonDeclWithTypedefName(/*AnyRedecl*/true))
1365 return LinkageInfo::none();
1368 case Decl::TemplateTemplateParm: // count these as external
1369 case Decl::NonTypeTemplateParm:
1370 case Decl::ObjCAtDefsField:
1371 case Decl::ObjCCategory:
1372 case Decl::ObjCCategoryImpl:
1373 case Decl::ObjCCompatibleAlias:
1374 case Decl::ObjCImplementation:
1375 case Decl::ObjCMethod:
1376 case Decl::ObjCProperty:
1377 case Decl::ObjCPropertyImpl:
1378 case Decl::ObjCProtocol:
1379 return getExternalLinkageFor(D);
1381 case Decl::CXXRecord: {
1382 const auto *Record = cast<CXXRecordDecl>(D);
1383 if (Record->isLambda()) {
1384 if (Record->hasKnownLambdaInternalLinkage() ||
1385 !Record->getLambdaManglingNumber()) {
1386 // This lambda has no mangling number, so it's internal.
1387 return getInternalLinkageFor(D);
1390 return getLVForClosure(
1391 Record->getDeclContext()->getRedeclContext(),
1392 Record->getLambdaContextDecl(), computation);
1399 // Handle linkage for namespace-scope names.
1400 if (D->getDeclContext()->getRedeclContext()->isFileContext())
1401 return getLVForNamespaceScopeDecl(D, computation, IgnoreVarTypeLinkage);
1403 // C++ [basic.link]p5:
1404 // In addition, a member function, static data member, a named
1405 // class or enumeration of class scope, or an unnamed class or
1406 // enumeration defined in a class-scope typedef declaration such
1407 // that the class or enumeration has the typedef name for linkage
1408 // purposes (7.1.3), has external linkage if the name of the class
1409 // has external linkage.
1410 if (D->getDeclContext()->isRecord())
1411 return getLVForClassMember(D, computation, IgnoreVarTypeLinkage);
1413 // C++ [basic.link]p6:
1414 // The name of a function declared in block scope and the name of
1415 // an object declared by a block scope extern declaration have
1416 // linkage. If there is a visible declaration of an entity with
1417 // linkage having the same name and type, ignoring entities
1418 // declared outside the innermost enclosing namespace scope, the
1419 // block scope declaration declares that same entity and receives
1420 // the linkage of the previous declaration. If there is more than
1421 // one such matching entity, the program is ill-formed. Otherwise,
1422 // if no matching entity is found, the block scope entity receives
1423 // external linkage.
1424 if (D->getDeclContext()->isFunctionOrMethod())
1425 return getLVForLocalDecl(D, computation);
1427 // C++ [basic.link]p6:
1428 // Names not covered by these rules have no linkage.
1429 return LinkageInfo::none();
1432 /// getLVForDecl - Get the linkage and visibility for the given declaration.
1433 LinkageInfo LinkageComputer::getLVForDecl(const NamedDecl *D,
1434 LVComputationKind computation) {
1435 // Internal_linkage attribute overrides other considerations.
1436 if (D->hasAttr<InternalLinkageAttr>())
1437 return getInternalLinkageFor(D);
1439 if (computation.IgnoreAllVisibility && D->hasCachedLinkage())
1440 return LinkageInfo(D->getCachedLinkage(), DefaultVisibility, false);
1442 if (llvm::Optional<LinkageInfo> LI = lookup(D, computation))
1445 LinkageInfo LV = computeLVForDecl(D, computation);
1446 if (D->hasCachedLinkage())
1447 assert(D->getCachedLinkage() == LV.getLinkage());
1449 D->setCachedLinkage(LV.getLinkage());
1450 cache(D, computation, LV);
1453 // In C (because of gnu inline) and in c++ with microsoft extensions an
1454 // static can follow an extern, so we can have two decls with different
1456 const LangOptions &Opts = D->getASTContext().getLangOpts();
1457 if (!Opts.CPlusPlus || Opts.MicrosoftExt)
1460 // We have just computed the linkage for this decl. By induction we know
1461 // that all other computed linkages match, check that the one we just
1462 // computed also does.
1463 NamedDecl *Old = nullptr;
1464 for (auto I : D->redecls()) {
1465 auto *T = cast<NamedDecl>(I);
1468 if (!T->isInvalidDecl() && T->hasCachedLinkage()) {
1473 assert(!Old || Old->getCachedLinkage() == D->getCachedLinkage());
1479 LinkageInfo LinkageComputer::getDeclLinkageAndVisibility(const NamedDecl *D) {
1480 return getLVForDecl(D,
1481 LVComputationKind(usesTypeVisibility(D)
1482 ? NamedDecl::VisibilityForType
1483 : NamedDecl::VisibilityForValue));
1486 Module *Decl::getOwningModuleForLinkage(bool IgnoreLinkage) const {
1487 Module *M = getOwningModule();
1492 case Module::ModuleMapModule:
1493 // Module map modules have no special linkage semantics.
1496 case Module::ModuleInterfaceUnit:
1499 case Module::GlobalModuleFragment: {
1500 // External linkage declarations in the global module have no owning module
1501 // for linkage purposes. But internal linkage declarations in the global
1502 // module fragment of a particular module are owned by that module for
1503 // linkage purposes.
1506 bool InternalLinkage;
1507 if (auto *ND = dyn_cast<NamedDecl>(this))
1508 InternalLinkage = !ND->hasExternalFormalLinkage();
1510 auto *NSD = dyn_cast<NamespaceDecl>(this);
1511 InternalLinkage = (NSD && NSD->isAnonymousNamespace()) ||
1512 isInAnonymousNamespace();
1514 return InternalLinkage ? M->Parent : nullptr;
1517 case Module::PrivateModuleFragment:
1518 // The private module fragment is part of its containing module for linkage
1523 llvm_unreachable("unknown module kind");
1526 void NamedDecl::printName(raw_ostream &os) const {
1530 std::string NamedDecl::getQualifiedNameAsString() const {
1531 std::string QualName;
1532 llvm::raw_string_ostream OS(QualName);
1533 printQualifiedName(OS, getASTContext().getPrintingPolicy());
1537 void NamedDecl::printQualifiedName(raw_ostream &OS) const {
1538 printQualifiedName(OS, getASTContext().getPrintingPolicy());
1541 void NamedDecl::printQualifiedName(raw_ostream &OS,
1542 const PrintingPolicy &P) const {
1543 if (getDeclContext()->isFunctionOrMethod()) {
1544 // We do not print '(anonymous)' for function parameters without name.
1548 printNestedNameSpecifier(OS, P);
1552 // Give the printName override a chance to pick a different name before we
1553 // fall back to "(anonymous)".
1554 SmallString<64> NameBuffer;
1555 llvm::raw_svector_ostream NameOS(NameBuffer);
1557 if (NameBuffer.empty())
1558 OS << "(anonymous)";
1564 void NamedDecl::printNestedNameSpecifier(raw_ostream &OS) const {
1565 printNestedNameSpecifier(OS, getASTContext().getPrintingPolicy());
1568 void NamedDecl::printNestedNameSpecifier(raw_ostream &OS,
1569 const PrintingPolicy &P) const {
1570 const DeclContext *Ctx = getDeclContext();
1572 // For ObjC methods and properties, look through categories and use the
1573 // interface as context.
1574 if (auto *MD = dyn_cast<ObjCMethodDecl>(this)) {
1575 if (auto *ID = MD->getClassInterface())
1577 } else if (auto *PD = dyn_cast<ObjCPropertyDecl>(this)) {
1578 if (auto *MD = PD->getGetterMethodDecl())
1579 if (auto *ID = MD->getClassInterface())
1581 } else if (auto *ID = dyn_cast<ObjCIvarDecl>(this)) {
1582 if (auto *CI = ID->getContainingInterface())
1586 if (Ctx->isFunctionOrMethod())
1589 using ContextsTy = SmallVector<const DeclContext *, 8>;
1590 ContextsTy Contexts;
1592 // Collect named contexts.
1594 if (isa<NamedDecl>(Ctx))
1595 Contexts.push_back(Ctx);
1596 Ctx = Ctx->getParent();
1599 for (const DeclContext *DC : llvm::reverse(Contexts)) {
1600 if (const auto *Spec = dyn_cast<ClassTemplateSpecializationDecl>(DC)) {
1601 OS << Spec->getName();
1602 const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs();
1603 printTemplateArgumentList(OS, TemplateArgs.asArray(), P);
1604 } else if (const auto *ND = dyn_cast<NamespaceDecl>(DC)) {
1605 if (P.SuppressUnwrittenScope &&
1606 (ND->isAnonymousNamespace() || ND->isInline()))
1608 if (ND->isAnonymousNamespace()) {
1609 OS << (P.MSVCFormatting ? "`anonymous namespace\'"
1610 : "(anonymous namespace)");
1614 } else if (const auto *RD = dyn_cast<RecordDecl>(DC)) {
1615 if (!RD->getIdentifier())
1616 OS << "(anonymous " << RD->getKindName() << ')';
1619 } else if (const auto *FD = dyn_cast<FunctionDecl>(DC)) {
1620 const FunctionProtoType *FT = nullptr;
1621 if (FD->hasWrittenPrototype())
1622 FT = dyn_cast<FunctionProtoType>(FD->getType()->castAs<FunctionType>());
1626 unsigned NumParams = FD->getNumParams();
1627 for (unsigned i = 0; i < NumParams; ++i) {
1630 OS << FD->getParamDecl(i)->getType().stream(P);
1633 if (FT->isVariadic()) {
1640 } else if (const auto *ED = dyn_cast<EnumDecl>(DC)) {
1641 // C++ [dcl.enum]p10: Each enum-name and each unscoped
1642 // enumerator is declared in the scope that immediately contains
1643 // the enum-specifier. Each scoped enumerator is declared in the
1644 // scope of the enumeration.
1645 // For the case of unscoped enumerator, do not include in the qualified
1646 // name any information about its enum enclosing scope, as its visibility
1653 OS << *cast<NamedDecl>(DC);
1659 void NamedDecl::getNameForDiagnostic(raw_ostream &OS,
1660 const PrintingPolicy &Policy,
1661 bool Qualified) const {
1663 printQualifiedName(OS, Policy);
1668 template<typename T> static bool isRedeclarableImpl(Redeclarable<T> *) {
1671 static bool isRedeclarableImpl(...) { return false; }
1672 static bool isRedeclarable(Decl::Kind K) {
1674 #define DECL(Type, Base) \
1676 return isRedeclarableImpl((Type##Decl *)nullptr);
1677 #define ABSTRACT_DECL(DECL)
1678 #include "clang/AST/DeclNodes.inc"
1680 llvm_unreachable("unknown decl kind");
1683 bool NamedDecl::declarationReplaces(NamedDecl *OldD, bool IsKnownNewer) const {
1684 assert(getDeclName() == OldD->getDeclName() && "Declaration name mismatch");
1686 // Never replace one imported declaration with another; we need both results
1687 // when re-exporting.
1688 if (OldD->isFromASTFile() && isFromASTFile())
1691 // A kind mismatch implies that the declaration is not replaced.
1692 if (OldD->getKind() != getKind())
1695 // For method declarations, we never replace. (Why?)
1696 if (isa<ObjCMethodDecl>(this))
1699 // For parameters, pick the newer one. This is either an error or (in
1700 // Objective-C) permitted as an extension.
1701 if (isa<ParmVarDecl>(this))
1704 // Inline namespaces can give us two declarations with the same
1705 // name and kind in the same scope but different contexts; we should
1706 // keep both declarations in this case.
1707 if (!this->getDeclContext()->getRedeclContext()->Equals(
1708 OldD->getDeclContext()->getRedeclContext()))
1711 // Using declarations can be replaced if they import the same name from the
1713 if (auto *UD = dyn_cast<UsingDecl>(this)) {
1714 ASTContext &Context = getASTContext();
1715 return Context.getCanonicalNestedNameSpecifier(UD->getQualifier()) ==
1716 Context.getCanonicalNestedNameSpecifier(
1717 cast<UsingDecl>(OldD)->getQualifier());
1719 if (auto *UUVD = dyn_cast<UnresolvedUsingValueDecl>(this)) {
1720 ASTContext &Context = getASTContext();
1721 return Context.getCanonicalNestedNameSpecifier(UUVD->getQualifier()) ==
1722 Context.getCanonicalNestedNameSpecifier(
1723 cast<UnresolvedUsingValueDecl>(OldD)->getQualifier());
1726 if (isRedeclarable(getKind())) {
1727 if (getCanonicalDecl() != OldD->getCanonicalDecl())
1733 // Check whether this is actually newer than OldD. We want to keep the
1734 // newer declaration. This loop will usually only iterate once, because
1735 // OldD is usually the previous declaration.
1736 for (auto D : redecls()) {
1740 // If we reach the canonical declaration, then OldD is not actually older
1743 // FIXME: In this case, we should not add this decl to the lookup table.
1744 if (D->isCanonicalDecl())
1748 // It's a newer declaration of the same kind of declaration in the same
1749 // scope: we want this decl instead of the existing one.
1753 // In all other cases, we need to keep both declarations in case they have
1754 // different visibility. Any attempt to use the name will result in an
1755 // ambiguity if more than one is visible.
1759 bool NamedDecl::hasLinkage() const {
1760 return getFormalLinkage() != NoLinkage;
1763 NamedDecl *NamedDecl::getUnderlyingDeclImpl() {
1764 NamedDecl *ND = this;
1765 while (auto *UD = dyn_cast<UsingShadowDecl>(ND))
1766 ND = UD->getTargetDecl();
1768 if (auto *AD = dyn_cast<ObjCCompatibleAliasDecl>(ND))
1769 return AD->getClassInterface();
1771 if (auto *AD = dyn_cast<NamespaceAliasDecl>(ND))
1772 return AD->getNamespace();
1777 bool NamedDecl::isCXXInstanceMember() const {
1778 if (!isCXXClassMember())
1781 const NamedDecl *D = this;
1782 if (isa<UsingShadowDecl>(D))
1783 D = cast<UsingShadowDecl>(D)->getTargetDecl();
1785 if (isa<FieldDecl>(D) || isa<IndirectFieldDecl>(D) || isa<MSPropertyDecl>(D))
1787 if (const auto *MD = dyn_cast_or_null<CXXMethodDecl>(D->getAsFunction()))
1788 return MD->isInstance();
1792 //===----------------------------------------------------------------------===//
1793 // DeclaratorDecl Implementation
1794 //===----------------------------------------------------------------------===//
1796 template <typename DeclT>
1797 static SourceLocation getTemplateOrInnerLocStart(const DeclT *decl) {
1798 if (decl->getNumTemplateParameterLists() > 0)
1799 return decl->getTemplateParameterList(0)->getTemplateLoc();
1801 return decl->getInnerLocStart();
1804 SourceLocation DeclaratorDecl::getTypeSpecStartLoc() const {
1805 TypeSourceInfo *TSI = getTypeSourceInfo();
1806 if (TSI) return TSI->getTypeLoc().getBeginLoc();
1807 return SourceLocation();
1810 SourceLocation DeclaratorDecl::getTypeSpecEndLoc() const {
1811 TypeSourceInfo *TSI = getTypeSourceInfo();
1812 if (TSI) return TSI->getTypeLoc().getEndLoc();
1813 return SourceLocation();
1816 void DeclaratorDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) {
1818 // Make sure the extended decl info is allocated.
1819 if (!hasExtInfo()) {
1820 // Save (non-extended) type source info pointer.
1821 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
1822 // Allocate external info struct.
1823 DeclInfo = new (getASTContext()) ExtInfo;
1824 // Restore savedTInfo into (extended) decl info.
1825 getExtInfo()->TInfo = savedTInfo;
1827 // Set qualifier info.
1828 getExtInfo()->QualifierLoc = QualifierLoc;
1829 } else if (hasExtInfo()) {
1830 // Here Qualifier == 0, i.e., we are removing the qualifier (if any).
1831 getExtInfo()->QualifierLoc = QualifierLoc;
1835 void DeclaratorDecl::setTrailingRequiresClause(Expr *TrailingRequiresClause) {
1836 assert(TrailingRequiresClause);
1837 // Make sure the extended decl info is allocated.
1838 if (!hasExtInfo()) {
1839 // Save (non-extended) type source info pointer.
1840 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
1841 // Allocate external info struct.
1842 DeclInfo = new (getASTContext()) ExtInfo;
1843 // Restore savedTInfo into (extended) decl info.
1844 getExtInfo()->TInfo = savedTInfo;
1846 // Set requires clause info.
1847 getExtInfo()->TrailingRequiresClause = TrailingRequiresClause;
1850 void DeclaratorDecl::setTemplateParameterListsInfo(
1851 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
1852 assert(!TPLists.empty());
1853 // Make sure the extended decl info is allocated.
1854 if (!hasExtInfo()) {
1855 // Save (non-extended) type source info pointer.
1856 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
1857 // Allocate external info struct.
1858 DeclInfo = new (getASTContext()) ExtInfo;
1859 // Restore savedTInfo into (extended) decl info.
1860 getExtInfo()->TInfo = savedTInfo;
1862 // Set the template parameter lists info.
1863 getExtInfo()->setTemplateParameterListsInfo(Context, TPLists);
1866 SourceLocation DeclaratorDecl::getOuterLocStart() const {
1867 return getTemplateOrInnerLocStart(this);
1870 // Helper function: returns true if QT is or contains a type
1871 // having a postfix component.
1872 static bool typeIsPostfix(QualType QT) {
1874 const Type* T = QT.getTypePtr();
1875 switch (T->getTypeClass()) {
1879 QT = cast<PointerType>(T)->getPointeeType();
1881 case Type::BlockPointer:
1882 QT = cast<BlockPointerType>(T)->getPointeeType();
1884 case Type::MemberPointer:
1885 QT = cast<MemberPointerType>(T)->getPointeeType();
1887 case Type::LValueReference:
1888 case Type::RValueReference:
1889 QT = cast<ReferenceType>(T)->getPointeeType();
1891 case Type::PackExpansion:
1892 QT = cast<PackExpansionType>(T)->getPattern();
1895 case Type::ConstantArray:
1896 case Type::DependentSizedArray:
1897 case Type::IncompleteArray:
1898 case Type::VariableArray:
1899 case Type::FunctionProto:
1900 case Type::FunctionNoProto:
1906 SourceRange DeclaratorDecl::getSourceRange() const {
1907 SourceLocation RangeEnd = getLocation();
1908 if (TypeSourceInfo *TInfo = getTypeSourceInfo()) {
1909 // If the declaration has no name or the type extends past the name take the
1910 // end location of the type.
1911 if (!getDeclName() || typeIsPostfix(TInfo->getType()))
1912 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
1914 return SourceRange(getOuterLocStart(), RangeEnd);
1917 void QualifierInfo::setTemplateParameterListsInfo(
1918 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
1919 // Free previous template parameters (if any).
1920 if (NumTemplParamLists > 0) {
1921 Context.Deallocate(TemplParamLists);
1922 TemplParamLists = nullptr;
1923 NumTemplParamLists = 0;
1925 // Set info on matched template parameter lists (if any).
1926 if (!TPLists.empty()) {
1927 TemplParamLists = new (Context) TemplateParameterList *[TPLists.size()];
1928 NumTemplParamLists = TPLists.size();
1929 std::copy(TPLists.begin(), TPLists.end(), TemplParamLists);
1933 //===----------------------------------------------------------------------===//
1934 // VarDecl Implementation
1935 //===----------------------------------------------------------------------===//
1937 const char *VarDecl::getStorageClassSpecifierString(StorageClass SC) {
1939 case SC_None: break;
1940 case SC_Auto: return "auto";
1941 case SC_Extern: return "extern";
1942 case SC_PrivateExtern: return "__private_extern__";
1943 case SC_Register: return "register";
1944 case SC_Static: return "static";
1947 llvm_unreachable("Invalid storage class");
1950 VarDecl::VarDecl(Kind DK, ASTContext &C, DeclContext *DC,
1951 SourceLocation StartLoc, SourceLocation IdLoc,
1952 IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo,
1954 : DeclaratorDecl(DK, DC, IdLoc, Id, T, TInfo, StartLoc),
1955 redeclarable_base(C) {
1956 static_assert(sizeof(VarDeclBitfields) <= sizeof(unsigned),
1957 "VarDeclBitfields too large!");
1958 static_assert(sizeof(ParmVarDeclBitfields) <= sizeof(unsigned),
1959 "ParmVarDeclBitfields too large!");
1960 static_assert(sizeof(NonParmVarDeclBitfields) <= sizeof(unsigned),
1961 "NonParmVarDeclBitfields too large!");
1963 VarDeclBits.SClass = SC;
1964 // Everything else is implicitly initialized to false.
1967 VarDecl *VarDecl::Create(ASTContext &C, DeclContext *DC,
1968 SourceLocation StartL, SourceLocation IdL,
1969 IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo,
1971 return new (C, DC) VarDecl(Var, C, DC, StartL, IdL, Id, T, TInfo, S);
1974 VarDecl *VarDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
1976 VarDecl(Var, C, nullptr, SourceLocation(), SourceLocation(), nullptr,
1977 QualType(), nullptr, SC_None);
1980 void VarDecl::setStorageClass(StorageClass SC) {
1981 assert(isLegalForVariable(SC));
1982 VarDeclBits.SClass = SC;
1985 VarDecl::TLSKind VarDecl::getTLSKind() const {
1986 switch (VarDeclBits.TSCSpec) {
1987 case TSCS_unspecified:
1988 if (!hasAttr<ThreadAttr>() &&
1989 !(getASTContext().getLangOpts().OpenMPUseTLS &&
1990 getASTContext().getTargetInfo().isTLSSupported() &&
1991 hasAttr<OMPThreadPrivateDeclAttr>()))
1993 return ((getASTContext().getLangOpts().isCompatibleWithMSVC(
1994 LangOptions::MSVC2015)) ||
1995 hasAttr<OMPThreadPrivateDeclAttr>())
1998 case TSCS___thread: // Fall through.
1999 case TSCS__Thread_local:
2001 case TSCS_thread_local:
2004 llvm_unreachable("Unknown thread storage class specifier!");
2007 SourceRange VarDecl::getSourceRange() const {
2008 if (const Expr *Init = getInit()) {
2009 SourceLocation InitEnd = Init->getEndLoc();
2010 // If Init is implicit, ignore its source range and fallback on
2011 // DeclaratorDecl::getSourceRange() to handle postfix elements.
2012 if (InitEnd.isValid() && InitEnd != getLocation())
2013 return SourceRange(getOuterLocStart(), InitEnd);
2015 return DeclaratorDecl::getSourceRange();
2018 template<typename T>
2019 static LanguageLinkage getDeclLanguageLinkage(const T &D) {
2020 // C++ [dcl.link]p1: All function types, function names with external linkage,
2021 // and variable names with external linkage have a language linkage.
2022 if (!D.hasExternalFormalLinkage())
2023 return NoLanguageLinkage;
2025 // Language linkage is a C++ concept, but saying that everything else in C has
2026 // C language linkage fits the implementation nicely.
2027 ASTContext &Context = D.getASTContext();
2028 if (!Context.getLangOpts().CPlusPlus)
2029 return CLanguageLinkage;
2031 // C++ [dcl.link]p4: A C language linkage is ignored in determining the
2032 // language linkage of the names of class members and the function type of
2033 // class member functions.
2034 const DeclContext *DC = D.getDeclContext();
2036 return CXXLanguageLinkage;
2038 // If the first decl is in an extern "C" context, any other redeclaration
2039 // will have C language linkage. If the first one is not in an extern "C"
2040 // context, we would have reported an error for any other decl being in one.
2041 if (isFirstInExternCContext(&D))
2042 return CLanguageLinkage;
2043 return CXXLanguageLinkage;
2046 template<typename T>
2047 static bool isDeclExternC(const T &D) {
2048 // Since the context is ignored for class members, they can only have C++
2049 // language linkage or no language linkage.
2050 const DeclContext *DC = D.getDeclContext();
2051 if (DC->isRecord()) {
2052 assert(D.getASTContext().getLangOpts().CPlusPlus);
2056 return D.getLanguageLinkage() == CLanguageLinkage;
2059 LanguageLinkage VarDecl::getLanguageLinkage() const {
2060 return getDeclLanguageLinkage(*this);
2063 bool VarDecl::isExternC() const {
2064 return isDeclExternC(*this);
2067 bool VarDecl::isInExternCContext() const {
2068 return getLexicalDeclContext()->isExternCContext();
2071 bool VarDecl::isInExternCXXContext() const {
2072 return getLexicalDeclContext()->isExternCXXContext();
2075 VarDecl *VarDecl::getCanonicalDecl() { return getFirstDecl(); }
2077 VarDecl::DefinitionKind
2078 VarDecl::isThisDeclarationADefinition(ASTContext &C) const {
2079 if (isThisDeclarationADemotedDefinition())
2080 return DeclarationOnly;
2082 // C++ [basic.def]p2:
2083 // A declaration is a definition unless [...] it contains the 'extern'
2084 // specifier or a linkage-specification and neither an initializer [...],
2085 // it declares a non-inline static data member in a class declaration [...],
2086 // it declares a static data member outside a class definition and the variable
2087 // was defined within the class with the constexpr specifier [...],
2088 // C++1y [temp.expl.spec]p15:
2089 // An explicit specialization of a static data member or an explicit
2090 // specialization of a static data member template is a definition if the
2091 // declaration includes an initializer; otherwise, it is a declaration.
2093 // FIXME: How do you declare (but not define) a partial specialization of
2094 // a static data member template outside the containing class?
2095 if (isStaticDataMember()) {
2096 if (isOutOfLine() &&
2097 !(getCanonicalDecl()->isInline() &&
2098 getCanonicalDecl()->isConstexpr()) &&
2100 // If the first declaration is out-of-line, this may be an
2101 // instantiation of an out-of-line partial specialization of a variable
2102 // template for which we have not yet instantiated the initializer.
2103 (getFirstDecl()->isOutOfLine()
2104 ? getTemplateSpecializationKind() == TSK_Undeclared
2105 : getTemplateSpecializationKind() !=
2106 TSK_ExplicitSpecialization) ||
2107 isa<VarTemplatePartialSpecializationDecl>(this)))
2109 else if (!isOutOfLine() && isInline())
2112 return DeclarationOnly;
2115 // A definition of an identifier is a declaration for that identifier that
2116 // [...] causes storage to be reserved for that object.
2117 // Note: that applies for all non-file-scope objects.
2119 // If the declaration of an identifier for an object has file scope and an
2120 // initializer, the declaration is an external definition for the identifier
2124 if (hasDefiningAttr())
2127 if (const auto *SAA = getAttr<SelectAnyAttr>())
2128 if (!SAA->isInherited())
2131 // A variable template specialization (other than a static data member
2132 // template or an explicit specialization) is a declaration until we
2133 // instantiate its initializer.
2134 if (auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(this)) {
2135 if (VTSD->getTemplateSpecializationKind() != TSK_ExplicitSpecialization &&
2136 !isa<VarTemplatePartialSpecializationDecl>(VTSD) &&
2137 !VTSD->IsCompleteDefinition)
2138 return DeclarationOnly;
2141 if (hasExternalStorage())
2142 return DeclarationOnly;
2145 // A declaration directly contained in a linkage-specification is treated
2146 // as if it contains the extern specifier for the purpose of determining
2147 // the linkage of the declared name and whether it is a definition.
2148 if (isSingleLineLanguageLinkage(*this))
2149 return DeclarationOnly;
2152 // A declaration of an object that has file scope without an initializer,
2153 // and without a storage class specifier or the scs 'static', constitutes
2154 // a tentative definition.
2155 // No such thing in C++.
2156 if (!C.getLangOpts().CPlusPlus && isFileVarDecl())
2157 return TentativeDefinition;
2159 // What's left is (in C, block-scope) declarations without initializers or
2160 // external storage. These are definitions.
2164 VarDecl *VarDecl::getActingDefinition() {
2165 DefinitionKind Kind = isThisDeclarationADefinition();
2166 if (Kind != TentativeDefinition)
2169 VarDecl *LastTentative = nullptr;
2170 VarDecl *First = getFirstDecl();
2171 for (auto I : First->redecls()) {
2172 Kind = I->isThisDeclarationADefinition();
2173 if (Kind == Definition)
2175 else if (Kind == TentativeDefinition)
2178 return LastTentative;
2181 VarDecl *VarDecl::getDefinition(ASTContext &C) {
2182 VarDecl *First = getFirstDecl();
2183 for (auto I : First->redecls()) {
2184 if (I->isThisDeclarationADefinition(C) == Definition)
2190 VarDecl::DefinitionKind VarDecl::hasDefinition(ASTContext &C) const {
2191 DefinitionKind Kind = DeclarationOnly;
2193 const VarDecl *First = getFirstDecl();
2194 for (auto I : First->redecls()) {
2195 Kind = std::max(Kind, I->isThisDeclarationADefinition(C));
2196 if (Kind == Definition)
2203 const Expr *VarDecl::getAnyInitializer(const VarDecl *&D) const {
2204 for (auto I : redecls()) {
2205 if (auto Expr = I->getInit()) {
2213 bool VarDecl::hasInit() const {
2214 if (auto *P = dyn_cast<ParmVarDecl>(this))
2215 if (P->hasUnparsedDefaultArg() || P->hasUninstantiatedDefaultArg())
2218 return !Init.isNull();
2221 Expr *VarDecl::getInit() {
2225 if (auto *S = Init.dyn_cast<Stmt *>())
2226 return cast<Expr>(S);
2228 return cast_or_null<Expr>(Init.get<EvaluatedStmt *>()->Value);
2231 Stmt **VarDecl::getInitAddress() {
2232 if (auto *ES = Init.dyn_cast<EvaluatedStmt *>())
2235 return Init.getAddrOfPtr1();
2238 VarDecl *VarDecl::getInitializingDeclaration() {
2239 VarDecl *Def = nullptr;
2240 for (auto I : redecls()) {
2244 if (I->isThisDeclarationADefinition()) {
2245 if (isStaticDataMember())
2254 bool VarDecl::isOutOfLine() const {
2255 if (Decl::isOutOfLine())
2258 if (!isStaticDataMember())
2261 // If this static data member was instantiated from a static data member of
2262 // a class template, check whether that static data member was defined
2264 if (VarDecl *VD = getInstantiatedFromStaticDataMember())
2265 return VD->isOutOfLine();
2270 void VarDecl::setInit(Expr *I) {
2271 if (auto *Eval = Init.dyn_cast<EvaluatedStmt *>()) {
2272 Eval->~EvaluatedStmt();
2273 getASTContext().Deallocate(Eval);
2279 bool VarDecl::mightBeUsableInConstantExpressions(ASTContext &C) const {
2280 const LangOptions &Lang = C.getLangOpts();
2282 if (!Lang.CPlusPlus)
2285 // Function parameters are never usable in constant expressions.
2286 if (isa<ParmVarDecl>(this))
2289 // In C++11, any variable of reference type can be used in a constant
2290 // expression if it is initialized by a constant expression.
2291 if (Lang.CPlusPlus11 && getType()->isReferenceType())
2294 // Only const objects can be used in constant expressions in C++. C++98 does
2295 // not require the variable to be non-volatile, but we consider this to be a
2297 if (!getType().isConstQualified() || getType().isVolatileQualified())
2300 // In C++, const, non-volatile variables of integral or enumeration types
2301 // can be used in constant expressions.
2302 if (getType()->isIntegralOrEnumerationType())
2305 // Additionally, in C++11, non-volatile constexpr variables can be used in
2306 // constant expressions.
2307 return Lang.CPlusPlus11 && isConstexpr();
2310 bool VarDecl::isUsableInConstantExpressions(ASTContext &Context) const {
2311 // C++2a [expr.const]p3:
2312 // A variable is usable in constant expressions after its initializing
2313 // declaration is encountered...
2314 const VarDecl *DefVD = nullptr;
2315 const Expr *Init = getAnyInitializer(DefVD);
2316 if (!Init || Init->isValueDependent() || getType()->isDependentType())
2318 // ... if it is a constexpr variable, or it is of reference type or of
2319 // const-qualified integral or enumeration type, ...
2320 if (!DefVD->mightBeUsableInConstantExpressions(Context))
2322 // ... and its initializer is a constant initializer.
2323 return DefVD->checkInitIsICE();
2326 /// Convert the initializer for this declaration to the elaborated EvaluatedStmt
2327 /// form, which contains extra information on the evaluated value of the
2329 EvaluatedStmt *VarDecl::ensureEvaluatedStmt() const {
2330 auto *Eval = Init.dyn_cast<EvaluatedStmt *>();
2332 // Note: EvaluatedStmt contains an APValue, which usually holds
2333 // resources not allocated from the ASTContext. We need to do some
2334 // work to avoid leaking those, but we do so in VarDecl::evaluateValue
2335 // where we can detect whether there's anything to clean up or not.
2336 Eval = new (getASTContext()) EvaluatedStmt;
2337 Eval->Value = Init.get<Stmt *>();
2343 APValue *VarDecl::evaluateValue() const {
2344 SmallVector<PartialDiagnosticAt, 8> Notes;
2345 return evaluateValue(Notes);
2348 APValue *VarDecl::evaluateValue(
2349 SmallVectorImpl<PartialDiagnosticAt> &Notes) const {
2350 EvaluatedStmt *Eval = ensureEvaluatedStmt();
2352 // We only produce notes indicating why an initializer is non-constant the
2353 // first time it is evaluated. FIXME: The notes won't always be emitted the
2354 // first time we try evaluation, so might not be produced at all.
2355 if (Eval->WasEvaluated)
2356 return Eval->Evaluated.isAbsent() ? nullptr : &Eval->Evaluated;
2358 const auto *Init = cast<Expr>(Eval->Value);
2359 assert(!Init->isValueDependent());
2361 if (Eval->IsEvaluating) {
2362 // FIXME: Produce a diagnostic for self-initialization.
2363 Eval->CheckedICE = true;
2364 Eval->IsICE = false;
2368 Eval->IsEvaluating = true;
2370 bool Result = Init->EvaluateAsInitializer(Eval->Evaluated, getASTContext(),
2373 // Ensure the computed APValue is cleaned up later if evaluation succeeded,
2374 // or that it's empty (so that there's nothing to clean up) if evaluation
2377 Eval->Evaluated = APValue();
2378 else if (Eval->Evaluated.needsCleanup())
2379 getASTContext().addDestruction(&Eval->Evaluated);
2381 Eval->IsEvaluating = false;
2382 Eval->WasEvaluated = true;
2384 // In C++11, we have determined whether the initializer was a constant
2385 // expression as a side-effect.
2386 if (getASTContext().getLangOpts().CPlusPlus11 && !Eval->CheckedICE) {
2387 Eval->CheckedICE = true;
2388 Eval->IsICE = Result && Notes.empty();
2391 return Result ? &Eval->Evaluated : nullptr;
2394 APValue *VarDecl::getEvaluatedValue() const {
2395 if (EvaluatedStmt *Eval = Init.dyn_cast<EvaluatedStmt *>())
2396 if (Eval->WasEvaluated)
2397 return &Eval->Evaluated;
2402 bool VarDecl::isInitKnownICE() const {
2403 if (EvaluatedStmt *Eval = Init.dyn_cast<EvaluatedStmt *>())
2404 return Eval->CheckedICE;
2409 bool VarDecl::isInitICE() const {
2410 assert(isInitKnownICE() &&
2411 "Check whether we already know that the initializer is an ICE");
2412 return Init.get<EvaluatedStmt *>()->IsICE;
2415 bool VarDecl::checkInitIsICE() const {
2416 // Initializers of weak variables are never ICEs.
2420 EvaluatedStmt *Eval = ensureEvaluatedStmt();
2421 if (Eval->CheckedICE)
2422 // We have already checked whether this subexpression is an
2423 // integral constant expression.
2426 const auto *Init = cast<Expr>(Eval->Value);
2427 assert(!Init->isValueDependent());
2429 // In C++11, evaluate the initializer to check whether it's a constant
2431 if (getASTContext().getLangOpts().CPlusPlus11) {
2432 SmallVector<PartialDiagnosticAt, 8> Notes;
2433 evaluateValue(Notes);
2437 // It's an ICE whether or not the definition we found is
2438 // out-of-line. See DR 721 and the discussion in Clang PR
2439 // 6206 for details.
2441 if (Eval->CheckingICE)
2443 Eval->CheckingICE = true;
2445 Eval->IsICE = Init->isIntegerConstantExpr(getASTContext());
2446 Eval->CheckingICE = false;
2447 Eval->CheckedICE = true;
2451 bool VarDecl::isParameterPack() const {
2452 return isa<PackExpansionType>(getType());
2455 template<typename DeclT>
2456 static DeclT *getDefinitionOrSelf(DeclT *D) {
2458 if (auto *Def = D->getDefinition())
2463 bool VarDecl::isEscapingByref() const {
2464 return hasAttr<BlocksAttr>() && NonParmVarDeclBits.EscapingByref;
2467 bool VarDecl::isNonEscapingByref() const {
2468 return hasAttr<BlocksAttr>() && !NonParmVarDeclBits.EscapingByref;
2471 VarDecl *VarDecl::getTemplateInstantiationPattern() const {
2472 const VarDecl *VD = this;
2474 // If this is an instantiated member, walk back to the template from which
2475 // it was instantiated.
2476 if (MemberSpecializationInfo *MSInfo = VD->getMemberSpecializationInfo()) {
2477 if (isTemplateInstantiation(MSInfo->getTemplateSpecializationKind())) {
2478 VD = VD->getInstantiatedFromStaticDataMember();
2479 while (auto *NewVD = VD->getInstantiatedFromStaticDataMember())
2484 // If it's an instantiated variable template specialization, find the
2485 // template or partial specialization from which it was instantiated.
2486 if (auto *VDTemplSpec = dyn_cast<VarTemplateSpecializationDecl>(VD)) {
2487 if (isTemplateInstantiation(VDTemplSpec->getTemplateSpecializationKind())) {
2488 auto From = VDTemplSpec->getInstantiatedFrom();
2489 if (auto *VTD = From.dyn_cast<VarTemplateDecl *>()) {
2490 while (!VTD->isMemberSpecialization()) {
2491 auto *NewVTD = VTD->getInstantiatedFromMemberTemplate();
2496 return getDefinitionOrSelf(VTD->getTemplatedDecl());
2499 From.dyn_cast<VarTemplatePartialSpecializationDecl *>()) {
2500 while (!VTPSD->isMemberSpecialization()) {
2501 auto *NewVTPSD = VTPSD->getInstantiatedFromMember();
2506 return getDefinitionOrSelf<VarDecl>(VTPSD);
2511 // If this is the pattern of a variable template, find where it was
2512 // instantiated from. FIXME: Is this necessary?
2513 if (VarTemplateDecl *VarTemplate = VD->getDescribedVarTemplate()) {
2514 while (!VarTemplate->isMemberSpecialization()) {
2515 auto *NewVT = VarTemplate->getInstantiatedFromMemberTemplate();
2518 VarTemplate = NewVT;
2521 return getDefinitionOrSelf(VarTemplate->getTemplatedDecl());
2526 return getDefinitionOrSelf(const_cast<VarDecl*>(VD));
2529 VarDecl *VarDecl::getInstantiatedFromStaticDataMember() const {
2530 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2531 return cast<VarDecl>(MSI->getInstantiatedFrom());
2536 TemplateSpecializationKind VarDecl::getTemplateSpecializationKind() const {
2537 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
2538 return Spec->getSpecializationKind();
2540 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2541 return MSI->getTemplateSpecializationKind();
2543 return TSK_Undeclared;
2546 TemplateSpecializationKind
2547 VarDecl::getTemplateSpecializationKindForInstantiation() const {
2548 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2549 return MSI->getTemplateSpecializationKind();
2551 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
2552 return Spec->getSpecializationKind();
2554 return TSK_Undeclared;
2557 SourceLocation VarDecl::getPointOfInstantiation() const {
2558 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
2559 return Spec->getPointOfInstantiation();
2561 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2562 return MSI->getPointOfInstantiation();
2564 return SourceLocation();
2567 VarTemplateDecl *VarDecl::getDescribedVarTemplate() const {
2568 return getASTContext().getTemplateOrSpecializationInfo(this)
2569 .dyn_cast<VarTemplateDecl *>();
2572 void VarDecl::setDescribedVarTemplate(VarTemplateDecl *Template) {
2573 getASTContext().setTemplateOrSpecializationInfo(this, Template);
2576 bool VarDecl::isKnownToBeDefined() const {
2577 const auto &LangOpts = getASTContext().getLangOpts();
2578 // In CUDA mode without relocatable device code, variables of form 'extern
2579 // __shared__ Foo foo[]' are pointers to the base of the GPU core's shared
2580 // memory pool. These are never undefined variables, even if they appear
2581 // inside of an anon namespace or static function.
2583 // With CUDA relocatable device code enabled, these variables don't get
2584 // special handling; they're treated like regular extern variables.
2585 if (LangOpts.CUDA && !LangOpts.GPURelocatableDeviceCode &&
2586 hasExternalStorage() && hasAttr<CUDASharedAttr>() &&
2587 isa<IncompleteArrayType>(getType()))
2590 return hasDefinition();
2593 bool VarDecl::isNoDestroy(const ASTContext &Ctx) const {
2594 return hasGlobalStorage() && (hasAttr<NoDestroyAttr>() ||
2595 (!Ctx.getLangOpts().RegisterStaticDestructors &&
2596 !hasAttr<AlwaysDestroyAttr>()));
2599 QualType::DestructionKind
2600 VarDecl::needsDestruction(const ASTContext &Ctx) const {
2601 if (EvaluatedStmt *Eval = Init.dyn_cast<EvaluatedStmt *>())
2602 if (Eval->HasConstantDestruction)
2603 return QualType::DK_none;
2605 if (isNoDestroy(Ctx))
2606 return QualType::DK_none;
2608 return getType().isDestructedType();
2611 MemberSpecializationInfo *VarDecl::getMemberSpecializationInfo() const {
2612 if (isStaticDataMember())
2614 // return getASTContext().getInstantiatedFromStaticDataMember(this);
2615 return getASTContext().getTemplateOrSpecializationInfo(this)
2616 .dyn_cast<MemberSpecializationInfo *>();
2620 void VarDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
2621 SourceLocation PointOfInstantiation) {
2622 assert((isa<VarTemplateSpecializationDecl>(this) ||
2623 getMemberSpecializationInfo()) &&
2624 "not a variable or static data member template specialization");
2626 if (VarTemplateSpecializationDecl *Spec =
2627 dyn_cast<VarTemplateSpecializationDecl>(this)) {
2628 Spec->setSpecializationKind(TSK);
2629 if (TSK != TSK_ExplicitSpecialization &&
2630 PointOfInstantiation.isValid() &&
2631 Spec->getPointOfInstantiation().isInvalid()) {
2632 Spec->setPointOfInstantiation(PointOfInstantiation);
2633 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
2634 L->InstantiationRequested(this);
2636 } else if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo()) {
2637 MSI->setTemplateSpecializationKind(TSK);
2638 if (TSK != TSK_ExplicitSpecialization && PointOfInstantiation.isValid() &&
2639 MSI->getPointOfInstantiation().isInvalid()) {
2640 MSI->setPointOfInstantiation(PointOfInstantiation);
2641 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
2642 L->InstantiationRequested(this);
2648 VarDecl::setInstantiationOfStaticDataMember(VarDecl *VD,
2649 TemplateSpecializationKind TSK) {
2650 assert(getASTContext().getTemplateOrSpecializationInfo(this).isNull() &&
2651 "Previous template or instantiation?");
2652 getASTContext().setInstantiatedFromStaticDataMember(this, VD, TSK);
2655 //===----------------------------------------------------------------------===//
2656 // ParmVarDecl Implementation
2657 //===----------------------------------------------------------------------===//
2659 ParmVarDecl *ParmVarDecl::Create(ASTContext &C, DeclContext *DC,
2660 SourceLocation StartLoc,
2661 SourceLocation IdLoc, IdentifierInfo *Id,
2662 QualType T, TypeSourceInfo *TInfo,
2663 StorageClass S, Expr *DefArg) {
2664 return new (C, DC) ParmVarDecl(ParmVar, C, DC, StartLoc, IdLoc, Id, T, TInfo,
2668 QualType ParmVarDecl::getOriginalType() const {
2669 TypeSourceInfo *TSI = getTypeSourceInfo();
2670 QualType T = TSI ? TSI->getType() : getType();
2671 if (const auto *DT = dyn_cast<DecayedType>(T))
2672 return DT->getOriginalType();
2676 ParmVarDecl *ParmVarDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
2678 ParmVarDecl(ParmVar, C, nullptr, SourceLocation(), SourceLocation(),
2679 nullptr, QualType(), nullptr, SC_None, nullptr);
2682 SourceRange ParmVarDecl::getSourceRange() const {
2683 if (!hasInheritedDefaultArg()) {
2684 SourceRange ArgRange = getDefaultArgRange();
2685 if (ArgRange.isValid())
2686 return SourceRange(getOuterLocStart(), ArgRange.getEnd());
2689 // DeclaratorDecl considers the range of postfix types as overlapping with the
2690 // declaration name, but this is not the case with parameters in ObjC methods.
2691 if (isa<ObjCMethodDecl>(getDeclContext()))
2692 return SourceRange(DeclaratorDecl::getBeginLoc(), getLocation());
2694 return DeclaratorDecl::getSourceRange();
2697 Expr *ParmVarDecl::getDefaultArg() {
2698 assert(!hasUnparsedDefaultArg() && "Default argument is not yet parsed!");
2699 assert(!hasUninstantiatedDefaultArg() &&
2700 "Default argument is not yet instantiated!");
2702 Expr *Arg = getInit();
2703 if (auto *E = dyn_cast_or_null<FullExpr>(Arg))
2704 return E->getSubExpr();
2709 void ParmVarDecl::setDefaultArg(Expr *defarg) {
2710 ParmVarDeclBits.DefaultArgKind = DAK_Normal;
2714 SourceRange ParmVarDecl::getDefaultArgRange() const {
2715 switch (ParmVarDeclBits.DefaultArgKind) {
2718 // Nothing we can do here.
2719 return SourceRange();
2721 case DAK_Uninstantiated:
2722 return getUninstantiatedDefaultArg()->getSourceRange();
2725 if (const Expr *E = getInit())
2726 return E->getSourceRange();
2728 // Missing an actual expression, may be invalid.
2729 return SourceRange();
2731 llvm_unreachable("Invalid default argument kind.");
2734 void ParmVarDecl::setUninstantiatedDefaultArg(Expr *arg) {
2735 ParmVarDeclBits.DefaultArgKind = DAK_Uninstantiated;
2739 Expr *ParmVarDecl::getUninstantiatedDefaultArg() {
2740 assert(hasUninstantiatedDefaultArg() &&
2741 "Wrong kind of initialization expression!");
2742 return cast_or_null<Expr>(Init.get<Stmt *>());
2745 bool ParmVarDecl::hasDefaultArg() const {
2746 // FIXME: We should just return false for DAK_None here once callers are
2747 // prepared for the case that we encountered an invalid default argument and
2748 // were unable to even build an invalid expression.
2749 return hasUnparsedDefaultArg() || hasUninstantiatedDefaultArg() ||
2753 void ParmVarDecl::setParameterIndexLarge(unsigned parameterIndex) {
2754 getASTContext().setParameterIndex(this, parameterIndex);
2755 ParmVarDeclBits.ParameterIndex = ParameterIndexSentinel;
2758 unsigned ParmVarDecl::getParameterIndexLarge() const {
2759 return getASTContext().getParameterIndex(this);
2762 //===----------------------------------------------------------------------===//
2763 // FunctionDecl Implementation
2764 //===----------------------------------------------------------------------===//
2766 FunctionDecl::FunctionDecl(Kind DK, ASTContext &C, DeclContext *DC,
2767 SourceLocation StartLoc,
2768 const DeclarationNameInfo &NameInfo, QualType T,
2769 TypeSourceInfo *TInfo, StorageClass S,
2770 bool isInlineSpecified,
2771 ConstexprSpecKind ConstexprKind,
2772 Expr *TrailingRequiresClause)
2773 : DeclaratorDecl(DK, DC, NameInfo.getLoc(), NameInfo.getName(), T, TInfo,
2775 DeclContext(DK), redeclarable_base(C), Body(), ODRHash(0),
2776 EndRangeLoc(NameInfo.getEndLoc()), DNLoc(NameInfo.getInfo()) {
2777 assert(T.isNull() || T->isFunctionType());
2778 FunctionDeclBits.SClass = S;
2779 FunctionDeclBits.IsInline = isInlineSpecified;
2780 FunctionDeclBits.IsInlineSpecified = isInlineSpecified;
2781 FunctionDeclBits.IsVirtualAsWritten = false;
2782 FunctionDeclBits.IsPure = false;
2783 FunctionDeclBits.HasInheritedPrototype = false;
2784 FunctionDeclBits.HasWrittenPrototype = true;
2785 FunctionDeclBits.IsDeleted = false;
2786 FunctionDeclBits.IsTrivial = false;
2787 FunctionDeclBits.IsTrivialForCall = false;
2788 FunctionDeclBits.IsDefaulted = false;
2789 FunctionDeclBits.IsExplicitlyDefaulted = false;
2790 FunctionDeclBits.HasDefaultedFunctionInfo = false;
2791 FunctionDeclBits.HasImplicitReturnZero = false;
2792 FunctionDeclBits.IsLateTemplateParsed = false;
2793 FunctionDeclBits.ConstexprKind = ConstexprKind;
2794 FunctionDeclBits.InstantiationIsPending = false;
2795 FunctionDeclBits.UsesSEHTry = false;
2796 FunctionDeclBits.UsesFPIntrin = false;
2797 FunctionDeclBits.HasSkippedBody = false;
2798 FunctionDeclBits.WillHaveBody = false;
2799 FunctionDeclBits.IsMultiVersion = false;
2800 FunctionDeclBits.IsCopyDeductionCandidate = false;
2801 FunctionDeclBits.HasODRHash = false;
2802 if (TrailingRequiresClause)
2803 setTrailingRequiresClause(TrailingRequiresClause);
2806 void FunctionDecl::getNameForDiagnostic(
2807 raw_ostream &OS, const PrintingPolicy &Policy, bool Qualified) const {
2808 NamedDecl::getNameForDiagnostic(OS, Policy, Qualified);
2809 const TemplateArgumentList *TemplateArgs = getTemplateSpecializationArgs();
2811 printTemplateArgumentList(OS, TemplateArgs->asArray(), Policy);
2814 bool FunctionDecl::isVariadic() const {
2815 if (const auto *FT = getType()->getAs<FunctionProtoType>())
2816 return FT->isVariadic();
2820 FunctionDecl::DefaultedFunctionInfo *
2821 FunctionDecl::DefaultedFunctionInfo::Create(ASTContext &Context,
2822 ArrayRef<DeclAccessPair> Lookups) {
2823 DefaultedFunctionInfo *Info = new (Context.Allocate(
2824 totalSizeToAlloc<DeclAccessPair>(Lookups.size()),
2825 std::max(alignof(DefaultedFunctionInfo), alignof(DeclAccessPair))))
2826 DefaultedFunctionInfo;
2827 Info->NumLookups = Lookups.size();
2828 std::uninitialized_copy(Lookups.begin(), Lookups.end(),
2829 Info->getTrailingObjects<DeclAccessPair>());
2833 void FunctionDecl::setDefaultedFunctionInfo(DefaultedFunctionInfo *Info) {
2834 assert(!FunctionDeclBits.HasDefaultedFunctionInfo && "already have this");
2835 assert(!Body && "can't replace function body with defaulted function info");
2837 FunctionDeclBits.HasDefaultedFunctionInfo = true;
2838 DefaultedInfo = Info;
2841 FunctionDecl::DefaultedFunctionInfo *
2842 FunctionDecl::getDefaultedFunctionInfo() const {
2843 return FunctionDeclBits.HasDefaultedFunctionInfo ? DefaultedInfo : nullptr;
2846 bool FunctionDecl::hasBody(const FunctionDecl *&Definition) const {
2847 for (auto I : redecls()) {
2848 if (I->doesThisDeclarationHaveABody()) {
2857 bool FunctionDecl::hasTrivialBody() const {
2858 Stmt *S = getBody();
2860 // Since we don't have a body for this function, we don't know if it's
2865 if (isa<CompoundStmt>(S) && cast<CompoundStmt>(S)->body_empty())
2870 bool FunctionDecl::isDefined(const FunctionDecl *&Definition) const {
2871 for (auto I : redecls()) {
2872 if (I->isThisDeclarationADefinition()) {
2881 Stmt *FunctionDecl::getBody(const FunctionDecl *&Definition) const {
2882 if (!hasBody(Definition))
2885 assert(!Definition->FunctionDeclBits.HasDefaultedFunctionInfo &&
2886 "definition should not have a body");
2887 if (Definition->Body)
2888 return Definition->Body.get(getASTContext().getExternalSource());
2893 void FunctionDecl::setBody(Stmt *B) {
2894 FunctionDeclBits.HasDefaultedFunctionInfo = false;
2895 Body = LazyDeclStmtPtr(B);
2897 EndRangeLoc = B->getEndLoc();
2900 void FunctionDecl::setPure(bool P) {
2901 FunctionDeclBits.IsPure = P;
2903 if (auto *Parent = dyn_cast<CXXRecordDecl>(getDeclContext()))
2904 Parent->markedVirtualFunctionPure();
2907 template<std::size_t Len>
2908 static bool isNamed(const NamedDecl *ND, const char (&Str)[Len]) {
2909 IdentifierInfo *II = ND->getIdentifier();
2910 return II && II->isStr(Str);
2913 bool FunctionDecl::isMain() const {
2914 const TranslationUnitDecl *tunit =
2915 dyn_cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext());
2917 !tunit->getASTContext().getLangOpts().Freestanding &&
2918 isNamed(this, "main");
2921 bool FunctionDecl::isMSVCRTEntryPoint() const {
2922 const TranslationUnitDecl *TUnit =
2923 dyn_cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext());
2927 // Even though we aren't really targeting MSVCRT if we are freestanding,
2928 // semantic analysis for these functions remains the same.
2930 // MSVCRT entry points only exist on MSVCRT targets.
2931 if (!TUnit->getASTContext().getTargetInfo().getTriple().isOSMSVCRT())
2934 // Nameless functions like constructors cannot be entry points.
2935 if (!getIdentifier())
2938 return llvm::StringSwitch<bool>(getName())
2939 .Cases("main", // an ANSI console app
2940 "wmain", // a Unicode console App
2941 "WinMain", // an ANSI GUI app
2942 "wWinMain", // a Unicode GUI app
2948 bool FunctionDecl::isReservedGlobalPlacementOperator() const {
2949 assert(getDeclName().getNameKind() == DeclarationName::CXXOperatorName);
2950 assert(getDeclName().getCXXOverloadedOperator() == OO_New ||
2951 getDeclName().getCXXOverloadedOperator() == OO_Delete ||
2952 getDeclName().getCXXOverloadedOperator() == OO_Array_New ||
2953 getDeclName().getCXXOverloadedOperator() == OO_Array_Delete);
2955 if (!getDeclContext()->getRedeclContext()->isTranslationUnit())
2958 const auto *proto = getType()->castAs<FunctionProtoType>();
2959 if (proto->getNumParams() != 2 || proto->isVariadic())
2962 ASTContext &Context =
2963 cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext())
2966 // The result type and first argument type are constant across all
2967 // these operators. The second argument must be exactly void*.
2968 return (proto->getParamType(1).getCanonicalType() == Context.VoidPtrTy);
2971 bool FunctionDecl::isReplaceableGlobalAllocationFunction(
2972 Optional<unsigned> *AlignmentParam, bool *IsNothrow) const {
2973 if (getDeclName().getNameKind() != DeclarationName::CXXOperatorName)
2975 if (getDeclName().getCXXOverloadedOperator() != OO_New &&
2976 getDeclName().getCXXOverloadedOperator() != OO_Delete &&
2977 getDeclName().getCXXOverloadedOperator() != OO_Array_New &&
2978 getDeclName().getCXXOverloadedOperator() != OO_Array_Delete)
2981 if (isa<CXXRecordDecl>(getDeclContext()))
2984 // This can only fail for an invalid 'operator new' declaration.
2985 if (!getDeclContext()->getRedeclContext()->isTranslationUnit())
2988 const auto *FPT = getType()->castAs<FunctionProtoType>();
2989 if (FPT->getNumParams() == 0 || FPT->getNumParams() > 3 || FPT->isVariadic())
2992 // If this is a single-parameter function, it must be a replaceable global
2993 // allocation or deallocation function.
2994 if (FPT->getNumParams() == 1)
2997 unsigned Params = 1;
2998 QualType Ty = FPT->getParamType(Params);
2999 ASTContext &Ctx = getASTContext();
3001 auto Consume = [&] {
3003 Ty = Params < FPT->getNumParams() ? FPT->getParamType(Params) : QualType();
3006 // In C++14, the next parameter can be a 'std::size_t' for sized delete.
3007 bool IsSizedDelete = false;
3008 if (Ctx.getLangOpts().SizedDeallocation &&
3009 (getDeclName().getCXXOverloadedOperator() == OO_Delete ||
3010 getDeclName().getCXXOverloadedOperator() == OO_Array_Delete) &&
3011 Ctx.hasSameType(Ty, Ctx.getSizeType())) {
3012 IsSizedDelete = true;
3016 // In C++17, the next parameter can be a 'std::align_val_t' for aligned
3018 if (Ctx.getLangOpts().AlignedAllocation && !Ty.isNull() && Ty->isAlignValT()) {
3021 *AlignmentParam = Params;
3024 // Finally, if this is not a sized delete, the final parameter can
3025 // be a 'const std::nothrow_t&'.
3026 if (!IsSizedDelete && !Ty.isNull() && Ty->isReferenceType()) {
3027 Ty = Ty->getPointeeType();
3028 if (Ty.getCVRQualifiers() != Qualifiers::Const)
3030 if (Ty->isNothrowT()) {
3037 return Params == FPT->getNumParams();
3040 bool FunctionDecl::isInlineBuiltinDeclaration() const {
3041 if (!getBuiltinID())
3044 const FunctionDecl *Definition;
3045 return hasBody(Definition) && Definition->isInlineSpecified();
3048 bool FunctionDecl::isDestroyingOperatorDelete() const {
3050 // Within a class C, a single object deallocation function with signature
3051 // (T, std::destroying_delete_t, <more params>)
3052 // is a destroying operator delete.
3053 if (!isa<CXXMethodDecl>(this) || getOverloadedOperator() != OO_Delete ||
3057 auto *RD = getParamDecl(1)->getType()->getAsCXXRecordDecl();
3058 return RD && RD->isInStdNamespace() && RD->getIdentifier() &&
3059 RD->getIdentifier()->isStr("destroying_delete_t");
3062 LanguageLinkage FunctionDecl::getLanguageLinkage() const {
3063 return getDeclLanguageLinkage(*this);
3066 bool FunctionDecl::isExternC() const {
3067 return isDeclExternC(*this);
3070 bool FunctionDecl::isInExternCContext() const {
3071 if (hasAttr<OpenCLKernelAttr>())
3073 return getLexicalDeclContext()->isExternCContext();
3076 bool FunctionDecl::isInExternCXXContext() const {
3077 return getLexicalDeclContext()->isExternCXXContext();
3080 bool FunctionDecl::isGlobal() const {
3081 if (const auto *Method = dyn_cast<CXXMethodDecl>(this))
3082 return Method->isStatic();
3084 if (getCanonicalDecl()->getStorageClass() == SC_Static)
3087 for (const DeclContext *DC = getDeclContext();
3089 DC = DC->getParent()) {
3090 if (const auto *Namespace = cast<NamespaceDecl>(DC)) {
3091 if (!Namespace->getDeclName())
3100 bool FunctionDecl::isNoReturn() const {
3101 if (hasAttr<NoReturnAttr>() || hasAttr<CXX11NoReturnAttr>() ||
3102 hasAttr<C11NoReturnAttr>())
3105 if (auto *FnTy = getType()->getAs<FunctionType>())
3106 return FnTy->getNoReturnAttr();
3112 MultiVersionKind FunctionDecl::getMultiVersionKind() const {
3113 if (hasAttr<TargetAttr>())
3114 return MultiVersionKind::Target;
3115 if (hasAttr<CPUDispatchAttr>())
3116 return MultiVersionKind::CPUDispatch;
3117 if (hasAttr<CPUSpecificAttr>())
3118 return MultiVersionKind::CPUSpecific;
3119 return MultiVersionKind::None;
3122 bool FunctionDecl::isCPUDispatchMultiVersion() const {
3123 return isMultiVersion() && hasAttr<CPUDispatchAttr>();
3126 bool FunctionDecl::isCPUSpecificMultiVersion() const {
3127 return isMultiVersion() && hasAttr<CPUSpecificAttr>();
3130 bool FunctionDecl::isTargetMultiVersion() const {
3131 return isMultiVersion() && hasAttr<TargetAttr>();
3135 FunctionDecl::setPreviousDeclaration(FunctionDecl *PrevDecl) {
3136 redeclarable_base::setPreviousDecl(PrevDecl);
3138 if (FunctionTemplateDecl *FunTmpl = getDescribedFunctionTemplate()) {
3139 FunctionTemplateDecl *PrevFunTmpl
3140 = PrevDecl? PrevDecl->getDescribedFunctionTemplate() : nullptr;
3141 assert((!PrevDecl || PrevFunTmpl) && "Function/function template mismatch");
3142 FunTmpl->setPreviousDecl(PrevFunTmpl);
3145 if (PrevDecl && PrevDecl->isInlined())
3146 setImplicitlyInline(true);
3149 FunctionDecl *FunctionDecl::getCanonicalDecl() { return getFirstDecl(); }
3151 /// Returns a value indicating whether this function corresponds to a builtin
3154 /// The function corresponds to a built-in function if it is declared at
3155 /// translation scope or within an extern "C" block and its name matches with
3156 /// the name of a builtin. The returned value will be 0 for functions that do
3157 /// not correspond to a builtin, a value of type \c Builtin::ID if in the
3158 /// target-independent range \c [1,Builtin::First), or a target-specific builtin
3161 /// \param ConsiderWrapperFunctions If true, we should consider wrapper
3162 /// functions as their wrapped builtins. This shouldn't be done in general, but
3163 /// it's useful in Sema to diagnose calls to wrappers based on their semantics.
3164 unsigned FunctionDecl::getBuiltinID(bool ConsiderWrapperFunctions) const {
3165 unsigned BuiltinID = 0;
3167 if (const auto *ABAA = getAttr<ArmBuiltinAliasAttr>()) {
3168 BuiltinID = ABAA->getBuiltinName()->getBuiltinID();
3169 } else if (const auto *A = getAttr<BuiltinAttr>()) {
3170 BuiltinID = A->getID();
3176 // If the function is marked "overloadable", it has a different mangled name
3177 // and is not the C library function.
3178 if (!ConsiderWrapperFunctions && hasAttr<OverloadableAttr>() &&
3179 !hasAttr<ArmBuiltinAliasAttr>())
3182 ASTContext &Context = getASTContext();
3183 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))
3186 // This function has the name of a known C library
3187 // function. Determine whether it actually refers to the C library
3188 // function or whether it just has the same name.
3190 // If this is a static function, it's not a builtin.
3191 if (!ConsiderWrapperFunctions && getStorageClass() == SC_Static)
3194 // OpenCL v1.2 s6.9.f - The library functions defined in
3195 // the C99 standard headers are not available.
3196 if (Context.getLangOpts().OpenCL &&
3197 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))
3200 // CUDA does not have device-side standard library. printf and malloc are the
3201 // only special cases that are supported by device-side runtime.
3202 if (Context.getLangOpts().CUDA && hasAttr<CUDADeviceAttr>() &&
3203 !hasAttr<CUDAHostAttr>() &&
3204 !(BuiltinID == Builtin::BIprintf || BuiltinID == Builtin::BImalloc))
3207 // As AMDGCN implementation of OpenMP does not have a device-side standard
3208 // library, none of the predefined library functions except printf and malloc
3209 // should be treated as a builtin i.e. 0 should be returned for them.
3210 if (Context.getTargetInfo().getTriple().isAMDGCN() &&
3211 Context.getLangOpts().OpenMPIsDevice &&
3212 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID) &&
3213 !(BuiltinID == Builtin::BIprintf || BuiltinID == Builtin::BImalloc))
3219 /// getNumParams - Return the number of parameters this function must have
3220 /// based on its FunctionType. This is the length of the ParamInfo array
3221 /// after it has been created.
3222 unsigned FunctionDecl::getNumParams() const {
3223 const auto *FPT = getType()->getAs<FunctionProtoType>();
3224 return FPT ? FPT->getNumParams() : 0;
3227 void FunctionDecl::setParams(ASTContext &C,
3228 ArrayRef<ParmVarDecl *> NewParamInfo) {
3229 assert(!ParamInfo && "Already has param info!");
3230 assert(NewParamInfo.size() == getNumParams() && "Parameter count mismatch!");
3232 // Zero params -> null pointer.
3233 if (!NewParamInfo.empty()) {
3234 ParamInfo = new (C) ParmVarDecl*[NewParamInfo.size()];
3235 std::copy(NewParamInfo.begin(), NewParamInfo.end(), ParamInfo);
3239 /// getMinRequiredArguments - Returns the minimum number of arguments
3240 /// needed to call this function. This may be fewer than the number of
3241 /// function parameters, if some of the parameters have default
3242 /// arguments (in C++) or are parameter packs (C++11).
3243 unsigned FunctionDecl::getMinRequiredArguments() const {
3244 if (!getASTContext().getLangOpts().CPlusPlus)
3245 return getNumParams();
3247 // Note that it is possible for a parameter with no default argument to
3248 // follow a parameter with a default argument.
3249 unsigned NumRequiredArgs = 0;
3250 unsigned MinParamsSoFar = 0;
3251 for (auto *Param : parameters()) {
3252 if (!Param->isParameterPack()) {
3254 if (!Param->hasDefaultArg())
3255 NumRequiredArgs = MinParamsSoFar;
3258 return NumRequiredArgs;
3261 bool FunctionDecl::hasOneParamOrDefaultArgs() const {
3262 return getNumParams() == 1 ||
3263 (getNumParams() > 1 &&
3264 std::all_of(param_begin() + 1, param_end(),
3265 [](ParmVarDecl *P) { return P->hasDefaultArg(); }));
3268 /// The combination of the extern and inline keywords under MSVC forces
3269 /// the function to be required.
3271 /// Note: This function assumes that we will only get called when isInlined()
3272 /// would return true for this FunctionDecl.
3273 bool FunctionDecl::isMSExternInline() const {
3274 assert(isInlined() && "expected to get called on an inlined function!");
3276 const ASTContext &Context = getASTContext();
3277 if (!Context.getTargetInfo().getCXXABI().isMicrosoft() &&
3278 !hasAttr<DLLExportAttr>())
3281 for (const FunctionDecl *FD = getMostRecentDecl(); FD;
3282 FD = FD->getPreviousDecl())
3283 if (!FD->isImplicit() && FD->getStorageClass() == SC_Extern)
3289 static bool redeclForcesDefMSVC(const FunctionDecl *Redecl) {
3290 if (Redecl->getStorageClass() != SC_Extern)
3293 for (const FunctionDecl *FD = Redecl->getPreviousDecl(); FD;
3294 FD = FD->getPreviousDecl())
3295 if (!FD->isImplicit() && FD->getStorageClass() == SC_Extern)
3301 static bool RedeclForcesDefC99(const FunctionDecl *Redecl) {
3302 // Only consider file-scope declarations in this test.
3303 if (!Redecl->getLexicalDeclContext()->isTranslationUnit())
3306 // Only consider explicit declarations; the presence of a builtin for a
3307 // libcall shouldn't affect whether a definition is externally visible.
3308 if (Redecl->isImplicit())
3311 if (!Redecl->isInlineSpecified() || Redecl->getStorageClass() == SC_Extern)
3312 return true; // Not an inline definition
3317 /// For a function declaration in C or C++, determine whether this
3318 /// declaration causes the definition to be externally visible.
3320 /// For instance, this determines if adding the current declaration to the set
3321 /// of redeclarations of the given functions causes
3322 /// isInlineDefinitionExternallyVisible to change from false to true.
3323 bool FunctionDecl::doesDeclarationForceExternallyVisibleDefinition() const {
3324 assert(!doesThisDeclarationHaveABody() &&
3325 "Must have a declaration without a body.");
3327 ASTContext &Context = getASTContext();
3329 if (Context.getLangOpts().MSVCCompat) {
3330 const FunctionDecl *Definition;
3331 if (hasBody(Definition) && Definition->isInlined() &&
3332 redeclForcesDefMSVC(this))
3336 if (Context.getLangOpts().CPlusPlus)
3339 if (Context.getLangOpts().GNUInline || hasAttr<GNUInlineAttr>()) {
3340 // With GNU inlining, a declaration with 'inline' but not 'extern', forces
3341 // an externally visible definition.
3343 // FIXME: What happens if gnu_inline gets added on after the first
3345 if (!isInlineSpecified() || getStorageClass() == SC_Extern)
3348 const FunctionDecl *Prev = this;
3349 bool FoundBody = false;
3350 while ((Prev = Prev->getPreviousDecl())) {
3351 FoundBody |= Prev->doesThisDeclarationHaveABody();
3353 if (Prev->doesThisDeclarationHaveABody()) {
3354 // If it's not the case that both 'inline' and 'extern' are
3355 // specified on the definition, then it is always externally visible.
3356 if (!Prev->isInlineSpecified() ||
3357 Prev->getStorageClass() != SC_Extern)
3359 } else if (Prev->isInlineSpecified() &&
3360 Prev->getStorageClass() != SC_Extern) {
3368 // [...] If all of the file scope declarations for a function in a
3369 // translation unit include the inline function specifier without extern,
3370 // then the definition in that translation unit is an inline definition.
3371 if (isInlineSpecified() && getStorageClass() != SC_Extern)
3373 const FunctionDecl *Prev = this;
3374 bool FoundBody = false;
3375 while ((Prev = Prev->getPreviousDecl())) {
3376 FoundBody |= Prev->doesThisDeclarationHaveABody();
3377 if (RedeclForcesDefC99(Prev))
3383 FunctionTypeLoc FunctionDecl::getFunctionTypeLoc() const {
3384 const TypeSourceInfo *TSI = getTypeSourceInfo();
3385 return TSI ? TSI->getTypeLoc().IgnoreParens().getAs<FunctionTypeLoc>()
3386 : FunctionTypeLoc();
3389 SourceRange FunctionDecl::getReturnTypeSourceRange() const {
3390 FunctionTypeLoc FTL = getFunctionTypeLoc();
3392 return SourceRange();
3394 // Skip self-referential return types.
3395 const SourceManager &SM = getASTContext().getSourceManager();
3396 SourceRange RTRange = FTL.getReturnLoc().getSourceRange();
3397 SourceLocation Boundary = getNameInfo().getBeginLoc();
3398 if (RTRange.isInvalid() || Boundary.isInvalid() ||
3399 !SM.isBeforeInTranslationUnit(RTRange.getEnd(), Boundary))
3400 return SourceRange();
3405 SourceRange FunctionDecl::getParametersSourceRange() const {
3406 unsigned NP = getNumParams();
3407 SourceLocation EllipsisLoc = getEllipsisLoc();
3409 if (NP == 0 && EllipsisLoc.isInvalid())
3410 return SourceRange();
3412 SourceLocation Begin =
3413 NP > 0 ? ParamInfo[0]->getSourceRange().getBegin() : EllipsisLoc;
3414 SourceLocation End = EllipsisLoc.isValid()
3416 : ParamInfo[NP - 1]->getSourceRange().getEnd();
3418 return SourceRange(Begin, End);
3421 SourceRange FunctionDecl::getExceptionSpecSourceRange() const {
3422 FunctionTypeLoc FTL = getFunctionTypeLoc();
3423 return FTL ? FTL.getExceptionSpecRange() : SourceRange();
3426 /// For an inline function definition in C, or for a gnu_inline function
3427 /// in C++, determine whether the definition will be externally visible.
3429 /// Inline function definitions are always available for inlining optimizations.
3430 /// However, depending on the language dialect, declaration specifiers, and
3431 /// attributes, the definition of an inline function may or may not be
3432 /// "externally" visible to other translation units in the program.
3434 /// In C99, inline definitions are not externally visible by default. However,
3435 /// if even one of the global-scope declarations is marked "extern inline", the
3436 /// inline definition becomes externally visible (C99 6.7.4p6).
3438 /// In GNU89 mode, or if the gnu_inline attribute is attached to the function
3439 /// definition, we use the GNU semantics for inline, which are nearly the
3440 /// opposite of C99 semantics. In particular, "inline" by itself will create
3441 /// an externally visible symbol, but "extern inline" will not create an
3442 /// externally visible symbol.
3443 bool FunctionDecl::isInlineDefinitionExternallyVisible() const {
3444 assert((doesThisDeclarationHaveABody() || willHaveBody() ||
3445 hasAttr<AliasAttr>()) &&
3446 "Must be a function definition");
3447 assert(isInlined() && "Function must be inline");
3448 ASTContext &Context = getASTContext();
3450 if (Context.getLangOpts().GNUInline || hasAttr<GNUInlineAttr>()) {
3451 // Note: If you change the logic here, please change
3452 // doesDeclarationForceExternallyVisibleDefinition as well.
3454 // If it's not the case that both 'inline' and 'extern' are
3455 // specified on the definition, then this inline definition is
3456 // externally visible.
3457 if (Context.getLangOpts().CPlusPlus)
3459 if (!(isInlineSpecified() && getStorageClass() == SC_Extern))
3462 // If any declaration is 'inline' but not 'extern', then this definition
3463 // is externally visible.
3464 for (auto Redecl : redecls()) {
3465 if (Redecl->isInlineSpecified() &&
3466 Redecl->getStorageClass() != SC_Extern)
3473 // The rest of this function is C-only.
3474 assert(!Context.getLangOpts().CPlusPlus &&
3475 "should not use C inline rules in C++");
3478 // [...] If all of the file scope declarations for a function in a
3479 // translation unit include the inline function specifier without extern,
3480 // then the definition in that translation unit is an inline definition.
3481 for (auto Redecl : redecls()) {
3482 if (RedeclForcesDefC99(Redecl))
3487 // An inline definition does not provide an external definition for the
3488 // function, and does not forbid an external definition in another
3489 // translation unit.
3493 /// getOverloadedOperator - Which C++ overloaded operator this
3494 /// function represents, if any.
3495 OverloadedOperatorKind FunctionDecl::getOverloadedOperator() const {
3496 if (getDeclName().getNameKind() == DeclarationName::CXXOperatorName)
3497 return getDeclName().getCXXOverloadedOperator();
3502 /// getLiteralIdentifier - The literal suffix identifier this function
3503 /// represents, if any.
3504 const IdentifierInfo *FunctionDecl::getLiteralIdentifier() const {
3505 if (getDeclName().getNameKind() == DeclarationName::CXXLiteralOperatorName)
3506 return getDeclName().getCXXLiteralIdentifier();
3511 FunctionDecl::TemplatedKind FunctionDecl::getTemplatedKind() const {
3512 if (TemplateOrSpecialization.isNull())
3513 return TK_NonTemplate;
3514 if (TemplateOrSpecialization.is<FunctionTemplateDecl *>())
3515 return TK_FunctionTemplate;
3516 if (TemplateOrSpecialization.is<MemberSpecializationInfo *>())
3517 return TK_MemberSpecialization;
3518 if (TemplateOrSpecialization.is<FunctionTemplateSpecializationInfo *>())
3519 return TK_FunctionTemplateSpecialization;
3520 if (TemplateOrSpecialization.is
3521 <DependentFunctionTemplateSpecializationInfo*>())
3522 return TK_DependentFunctionTemplateSpecialization;
3524 llvm_unreachable("Did we miss a TemplateOrSpecialization type?");
3527 FunctionDecl *FunctionDecl::getInstantiatedFromMemberFunction() const {
3528 if (MemberSpecializationInfo *Info = getMemberSpecializationInfo())
3529 return cast<FunctionDecl>(Info->getInstantiatedFrom());
3534 MemberSpecializationInfo *FunctionDecl::getMemberSpecializationInfo() const {
3536 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
3538 if (auto *FTSI = TemplateOrSpecialization
3539 .dyn_cast<FunctionTemplateSpecializationInfo *>())
3540 return FTSI->getMemberSpecializationInfo();
3545 FunctionDecl::setInstantiationOfMemberFunction(ASTContext &C,
3547 TemplateSpecializationKind TSK) {
3548 assert(TemplateOrSpecialization.isNull() &&
3549 "Member function is already a specialization");
3550 MemberSpecializationInfo *Info
3551 = new (C) MemberSpecializationInfo(FD, TSK);
3552 TemplateOrSpecialization = Info;
3555 FunctionTemplateDecl *FunctionDecl::getDescribedFunctionTemplate() const {
3556 return TemplateOrSpecialization.dyn_cast<FunctionTemplateDecl *>();
3559 void FunctionDecl::setDescribedFunctionTemplate(FunctionTemplateDecl *Template) {
3560 assert(TemplateOrSpecialization.isNull() &&
3561 "Member function is already a specialization");
3562 TemplateOrSpecialization = Template;
3565 bool FunctionDecl::isImplicitlyInstantiable() const {
3566 // If the function is invalid, it can't be implicitly instantiated.
3567 if (isInvalidDecl())
3570 switch (getTemplateSpecializationKindForInstantiation()) {
3571 case TSK_Undeclared:
3572 case TSK_ExplicitInstantiationDefinition:
3573 case TSK_ExplicitSpecialization:
3576 case TSK_ImplicitInstantiation:
3579 case TSK_ExplicitInstantiationDeclaration:
3584 // Find the actual template from which we will instantiate.
3585 const FunctionDecl *PatternDecl = getTemplateInstantiationPattern();
3586 bool HasPattern = false;
3588 HasPattern = PatternDecl->hasBody(PatternDecl);
3590 // C++0x [temp.explicit]p9:
3591 // Except for inline functions, other explicit instantiation declarations
3592 // have the effect of suppressing the implicit instantiation of the entity
3593 // to which they refer.
3594 if (!HasPattern || !PatternDecl)
3597 return PatternDecl->isInlined();
3600 bool FunctionDecl::isTemplateInstantiation() const {
3601 // FIXME: Remove this, it's not clear what it means. (Which template
3602 // specialization kind?)
3603 return clang::isTemplateInstantiation(getTemplateSpecializationKind());
3607 FunctionDecl::getTemplateInstantiationPattern(bool ForDefinition) const {
3608 // If this is a generic lambda call operator specialization, its
3609 // instantiation pattern is always its primary template's pattern
3610 // even if its primary template was instantiated from another
3611 // member template (which happens with nested generic lambdas).
3612 // Since a lambda's call operator's body is transformed eagerly,
3613 // we don't have to go hunting for a prototype definition template
3614 // (i.e. instantiated-from-member-template) to use as an instantiation
3617 if (isGenericLambdaCallOperatorSpecialization(
3618 dyn_cast<CXXMethodDecl>(this))) {
3619 assert(getPrimaryTemplate() && "not a generic lambda call operator?");
3620 return getDefinitionOrSelf(getPrimaryTemplate()->getTemplatedDecl());
3623 if (MemberSpecializationInfo *Info = getMemberSpecializationInfo()) {
3624 if (ForDefinition &&
3625 !clang::isTemplateInstantiation(Info->getTemplateSpecializationKind()))
3627 return getDefinitionOrSelf(cast<FunctionDecl>(Info->getInstantiatedFrom()));
3630 if (ForDefinition &&
3631 !clang::isTemplateInstantiation(getTemplateSpecializationKind()))
3634 if (FunctionTemplateDecl *Primary = getPrimaryTemplate()) {
3635 // If we hit a point where the user provided a specialization of this
3636 // template, we're done looking.
3637 while (!ForDefinition || !Primary->isMemberSpecialization()) {
3638 auto *NewPrimary = Primary->getInstantiatedFromMemberTemplate();
3641 Primary = NewPrimary;
3644 return getDefinitionOrSelf(Primary->getTemplatedDecl());
3650 FunctionTemplateDecl *FunctionDecl::getPrimaryTemplate() const {
3651 if (FunctionTemplateSpecializationInfo *Info
3652 = TemplateOrSpecialization
3653 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3654 return Info->getTemplate();
3659 FunctionTemplateSpecializationInfo *
3660 FunctionDecl::getTemplateSpecializationInfo() const {
3661 return TemplateOrSpecialization
3662 .dyn_cast<FunctionTemplateSpecializationInfo *>();
3665 const TemplateArgumentList *
3666 FunctionDecl::getTemplateSpecializationArgs() const {
3667 if (FunctionTemplateSpecializationInfo *Info
3668 = TemplateOrSpecialization
3669 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3670 return Info->TemplateArguments;
3675 const ASTTemplateArgumentListInfo *
3676 FunctionDecl::getTemplateSpecializationArgsAsWritten() const {
3677 if (FunctionTemplateSpecializationInfo *Info
3678 = TemplateOrSpecialization
3679 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3680 return Info->TemplateArgumentsAsWritten;
3686 FunctionDecl::setFunctionTemplateSpecialization(ASTContext &C,
3687 FunctionTemplateDecl *Template,
3688 const TemplateArgumentList *TemplateArgs,
3690 TemplateSpecializationKind TSK,
3691 const TemplateArgumentListInfo *TemplateArgsAsWritten,
3692 SourceLocation PointOfInstantiation) {
3693 assert((TemplateOrSpecialization.isNull() ||
3694 TemplateOrSpecialization.is<MemberSpecializationInfo *>()) &&
3695 "Member function is already a specialization");
3696 assert(TSK != TSK_Undeclared &&
3697 "Must specify the type of function template specialization");
3698 assert((TemplateOrSpecialization.isNull() ||
3699 TSK == TSK_ExplicitSpecialization) &&
3700 "Member specialization must be an explicit specialization");
3701 FunctionTemplateSpecializationInfo *Info =
3702 FunctionTemplateSpecializationInfo::Create(
3703 C, this, Template, TSK, TemplateArgs, TemplateArgsAsWritten,
3704 PointOfInstantiation,
3705 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>());
3706 TemplateOrSpecialization = Info;
3707 Template->addSpecialization(Info, InsertPos);
3711 FunctionDecl::setDependentTemplateSpecialization(ASTContext &Context,
3712 const UnresolvedSetImpl &Templates,
3713 const TemplateArgumentListInfo &TemplateArgs) {
3714 assert(TemplateOrSpecialization.isNull());
3715 DependentFunctionTemplateSpecializationInfo *Info =
3716 DependentFunctionTemplateSpecializationInfo::Create(Context, Templates,
3718 TemplateOrSpecialization = Info;
3721 DependentFunctionTemplateSpecializationInfo *
3722 FunctionDecl::getDependentSpecializationInfo() const {
3723 return TemplateOrSpecialization
3724 .dyn_cast<DependentFunctionTemplateSpecializationInfo *>();
3727 DependentFunctionTemplateSpecializationInfo *
3728 DependentFunctionTemplateSpecializationInfo::Create(
3729 ASTContext &Context, const UnresolvedSetImpl &Ts,
3730 const TemplateArgumentListInfo &TArgs) {
3731 void *Buffer = Context.Allocate(
3732 totalSizeToAlloc<TemplateArgumentLoc, FunctionTemplateDecl *>(
3733 TArgs.size(), Ts.size()));
3734 return new (Buffer) DependentFunctionTemplateSpecializationInfo(Ts, TArgs);
3737 DependentFunctionTemplateSpecializationInfo::
3738 DependentFunctionTemplateSpecializationInfo(const UnresolvedSetImpl &Ts,
3739 const TemplateArgumentListInfo &TArgs)
3740 : AngleLocs(TArgs.getLAngleLoc(), TArgs.getRAngleLoc()) {
3741 NumTemplates = Ts.size();
3742 NumArgs = TArgs.size();
3744 FunctionTemplateDecl **TsArray = getTrailingObjects<FunctionTemplateDecl *>();
3745 for (unsigned I = 0, E = Ts.size(); I != E; ++I)
3746 TsArray[I] = cast<FunctionTemplateDecl>(Ts[I]->getUnderlyingDecl());
3748 TemplateArgumentLoc *ArgsArray = getTrailingObjects<TemplateArgumentLoc>();
3749 for (unsigned I = 0, E = TArgs.size(); I != E; ++I)
3750 new (&ArgsArray[I]) TemplateArgumentLoc(TArgs[I]);
3753 TemplateSpecializationKind FunctionDecl::getTemplateSpecializationKind() const {
3754 // For a function template specialization, query the specialization
3755 // information object.
3756 if (FunctionTemplateSpecializationInfo *FTSInfo =
3757 TemplateOrSpecialization
3758 .dyn_cast<FunctionTemplateSpecializationInfo *>())
3759 return FTSInfo->getTemplateSpecializationKind();
3761 if (MemberSpecializationInfo *MSInfo =
3762 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
3763 return MSInfo->getTemplateSpecializationKind();
3765 return TSK_Undeclared;
3768 TemplateSpecializationKind
3769 FunctionDecl::getTemplateSpecializationKindForInstantiation() const {
3770 // This is the same as getTemplateSpecializationKind(), except that for a
3771 // function that is both a function template specialization and a member
3772 // specialization, we prefer the member specialization information. Eg:
3774 // template<typename T> struct A {
3775 // template<typename U> void f() {}
3776 // template<> void f<int>() {}
3779 // For A<int>::f<int>():
3780 // * getTemplateSpecializationKind() will return TSK_ExplicitSpecialization
3781 // * getTemplateSpecializationKindForInstantiation() will return
3782 // TSK_ImplicitInstantiation
3784 // This reflects the facts that A<int>::f<int> is an explicit specialization
3785 // of A<int>::f, and that A<int>::f<int> should be implicitly instantiated
3786 // from A::f<int> if a definition is needed.
3787 if (FunctionTemplateSpecializationInfo *FTSInfo =
3788 TemplateOrSpecialization
3789 .dyn_cast<FunctionTemplateSpecializationInfo *>()) {
3790 if (auto *MSInfo = FTSInfo->getMemberSpecializationInfo())
3791 return MSInfo->getTemplateSpecializationKind();
3792 return FTSInfo->getTemplateSpecializationKind();
3795 if (MemberSpecializationInfo *MSInfo =
3796 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
3797 return MSInfo->getTemplateSpecializationKind();
3799 return TSK_Undeclared;
3803 FunctionDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
3804 SourceLocation PointOfInstantiation) {
3805 if (FunctionTemplateSpecializationInfo *FTSInfo
3806 = TemplateOrSpecialization.dyn_cast<
3807 FunctionTemplateSpecializationInfo*>()) {
3808 FTSInfo->setTemplateSpecializationKind(TSK);
3809 if (TSK != TSK_ExplicitSpecialization &&
3810 PointOfInstantiation.isValid() &&
3811 FTSInfo->getPointOfInstantiation().isInvalid()) {
3812 FTSInfo->setPointOfInstantiation(PointOfInstantiation);
3813 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
3814 L->InstantiationRequested(this);
3816 } else if (MemberSpecializationInfo *MSInfo
3817 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>()) {
3818 MSInfo->setTemplateSpecializationKind(TSK);
3819 if (TSK != TSK_ExplicitSpecialization &&
3820 PointOfInstantiation.isValid() &&
3821 MSInfo->getPointOfInstantiation().isInvalid()) {
3822 MSInfo->setPointOfInstantiation(PointOfInstantiation);
3823 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
3824 L->InstantiationRequested(this);
3827 llvm_unreachable("Function cannot have a template specialization kind");
3830 SourceLocation FunctionDecl::getPointOfInstantiation() const {
3831 if (FunctionTemplateSpecializationInfo *FTSInfo
3832 = TemplateOrSpecialization.dyn_cast<
3833 FunctionTemplateSpecializationInfo*>())
3834 return FTSInfo->getPointOfInstantiation();
3835 else if (MemberSpecializationInfo *MSInfo
3836 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>())
3837 return MSInfo->getPointOfInstantiation();
3839 return SourceLocation();
3842 bool FunctionDecl::isOutOfLine() const {
3843 if (Decl::isOutOfLine())
3846 // If this function was instantiated from a member function of a
3847 // class template, check whether that member function was defined out-of-line.
3848 if (FunctionDecl *FD = getInstantiatedFromMemberFunction()) {
3849 const FunctionDecl *Definition;
3850 if (FD->hasBody(Definition))
3851 return Definition->isOutOfLine();
3854 // If this function was instantiated from a function template,
3855 // check whether that function template was defined out-of-line.
3856 if (FunctionTemplateDecl *FunTmpl = getPrimaryTemplate()) {
3857 const FunctionDecl *Definition;
3858 if (FunTmpl->getTemplatedDecl()->hasBody(Definition))
3859 return Definition->isOutOfLine();
3865 SourceRange FunctionDecl::getSourceRange() const {
3866 return SourceRange(getOuterLocStart(), EndRangeLoc);
3869 unsigned FunctionDecl::getMemoryFunctionKind() const {
3870 IdentifierInfo *FnInfo = getIdentifier();
3875 // Builtin handling.
3876 switch (getBuiltinID()) {
3877 case Builtin::BI__builtin_memset:
3878 case Builtin::BI__builtin___memset_chk:
3879 case Builtin::BImemset:
3880 return Builtin::BImemset;
3882 case Builtin::BI__builtin_memcpy:
3883 case Builtin::BI__builtin___memcpy_chk:
3884 case Builtin::BImemcpy:
3885 return Builtin::BImemcpy;
3887 case Builtin::BI__builtin_mempcpy:
3888 case Builtin::BI__builtin___mempcpy_chk:
3889 case Builtin::BImempcpy:
3890 return Builtin::BImempcpy;
3892 case Builtin::BI__builtin_memmove:
3893 case Builtin::BI__builtin___memmove_chk:
3894 case Builtin::BImemmove:
3895 return Builtin::BImemmove;
3897 case Builtin::BIstrlcpy:
3898 case Builtin::BI__builtin___strlcpy_chk:
3899 return Builtin::BIstrlcpy;
3901 case Builtin::BIstrlcat:
3902 case Builtin::BI__builtin___strlcat_chk:
3903 return Builtin::BIstrlcat;
3905 case Builtin::BI__builtin_memcmp:
3906 case Builtin::BImemcmp:
3907 return Builtin::BImemcmp;
3909 case Builtin::BI__builtin_bcmp:
3910 case Builtin::BIbcmp:
3911 return Builtin::BIbcmp;
3913 case Builtin::BI__builtin_strncpy:
3914 case Builtin::BI__builtin___strncpy_chk:
3915 case Builtin::BIstrncpy:
3916 return Builtin::BIstrncpy;
3918 case Builtin::BI__builtin_strncmp:
3919 case Builtin::BIstrncmp:
3920 return Builtin::BIstrncmp;
3922 case Builtin::BI__builtin_strncasecmp:
3923 case Builtin::BIstrncasecmp:
3924 return Builtin::BIstrncasecmp;
3926 case Builtin::BI__builtin_strncat:
3927 case Builtin::BI__builtin___strncat_chk:
3928 case Builtin::BIstrncat:
3929 return Builtin::BIstrncat;
3931 case Builtin::BI__builtin_strndup:
3932 case Builtin::BIstrndup:
3933 return Builtin::BIstrndup;
3935 case Builtin::BI__builtin_strlen:
3936 case Builtin::BIstrlen:
3937 return Builtin::BIstrlen;
3939 case Builtin::BI__builtin_bzero:
3940 case Builtin::BIbzero:
3941 return Builtin::BIbzero;
3945 if (FnInfo->isStr("memset"))
3946 return Builtin::BImemset;
3947 else if (FnInfo->isStr("memcpy"))
3948 return Builtin::BImemcpy;
3949 else if (FnInfo->isStr("mempcpy"))
3950 return Builtin::BImempcpy;
3951 else if (FnInfo->isStr("memmove"))
3952 return Builtin::BImemmove;
3953 else if (FnInfo->isStr("memcmp"))
3954 return Builtin::BImemcmp;
3955 else if (FnInfo->isStr("bcmp"))
3956 return Builtin::BIbcmp;
3957 else if (FnInfo->isStr("strncpy"))
3958 return Builtin::BIstrncpy;
3959 else if (FnInfo->isStr("strncmp"))
3960 return Builtin::BIstrncmp;
3961 else if (FnInfo->isStr("strncasecmp"))
3962 return Builtin::BIstrncasecmp;
3963 else if (FnInfo->isStr("strncat"))
3964 return Builtin::BIstrncat;
3965 else if (FnInfo->isStr("strndup"))
3966 return Builtin::BIstrndup;
3967 else if (FnInfo->isStr("strlen"))
3968 return Builtin::BIstrlen;
3969 else if (FnInfo->isStr("bzero"))
3970 return Builtin::BIbzero;
3977 unsigned FunctionDecl::getODRHash() const {
3978 assert(hasODRHash());
3982 unsigned FunctionDecl::getODRHash() {
3986 if (auto *FT = getInstantiatedFromMemberFunction()) {
3987 setHasODRHash(true);
3988 ODRHash = FT->getODRHash();
3993 Hash.AddFunctionDecl(this);
3994 setHasODRHash(true);
3995 ODRHash = Hash.CalculateHash();
3999 //===----------------------------------------------------------------------===//
4000 // FieldDecl Implementation
4001 //===----------------------------------------------------------------------===//
4003 FieldDecl *FieldDecl::Create(const ASTContext &C, DeclContext *DC,
4004 SourceLocation StartLoc, SourceLocation IdLoc,
4005 IdentifierInfo *Id, QualType T,
4006 TypeSourceInfo *TInfo, Expr *BW, bool Mutable,
4007 InClassInitStyle InitStyle) {
4008 return new (C, DC) FieldDecl(Decl::Field, DC, StartLoc, IdLoc, Id, T, TInfo,
4009 BW, Mutable, InitStyle);
4012 FieldDecl *FieldDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4013 return new (C, ID) FieldDecl(Field, nullptr, SourceLocation(),
4014 SourceLocation(), nullptr, QualType(), nullptr,
4015 nullptr, false, ICIS_NoInit);
4018 bool FieldDecl::isAnonymousStructOrUnion() const {
4019 if (!isImplicit() || getDeclName())
4022 if (const auto *Record = getType()->getAs<RecordType>())
4023 return Record->getDecl()->isAnonymousStructOrUnion();
4028 unsigned FieldDecl::getBitWidthValue(const ASTContext &Ctx) const {
4029 assert(isBitField() && "not a bitfield");
4030 return getBitWidth()->EvaluateKnownConstInt(Ctx).getZExtValue();
4033 bool FieldDecl::isZeroLengthBitField(const ASTContext &Ctx) const {
4034 return isUnnamedBitfield() && !getBitWidth()->isValueDependent() &&
4035 getBitWidthValue(Ctx) == 0;
4038 bool FieldDecl::isZeroSize(const ASTContext &Ctx) const {
4039 if (isZeroLengthBitField(Ctx))
4042 // C++2a [intro.object]p7:
4043 // An object has nonzero size if it
4044 // -- is not a potentially-overlapping subobject, or
4045 if (!hasAttr<NoUniqueAddressAttr>())
4048 // -- is not of class type, or
4049 const auto *RT = getType()->getAs<RecordType>();
4052 const RecordDecl *RD = RT->getDecl()->getDefinition();
4054 assert(isInvalidDecl() && "valid field has incomplete type");
4058 // -- [has] virtual member functions or virtual base classes, or
4059 // -- has subobjects of nonzero size or bit-fields of nonzero length
4060 const auto *CXXRD = cast<CXXRecordDecl>(RD);
4061 if (!CXXRD->isEmpty())
4064 // Otherwise, [...] the circumstances under which the object has zero size
4065 // are implementation-defined.
4066 // FIXME: This might be Itanium ABI specific; we don't yet know what the MS
4071 unsigned FieldDecl::getFieldIndex() const {
4072 const FieldDecl *Canonical = getCanonicalDecl();
4073 if (Canonical != this)
4074 return Canonical->getFieldIndex();
4076 if (CachedFieldIndex) return CachedFieldIndex - 1;
4079 const RecordDecl *RD = getParent()->getDefinition();
4080 assert(RD && "requested index for field of struct with no definition");
4082 for (auto *Field : RD->fields()) {
4083 Field->getCanonicalDecl()->CachedFieldIndex = Index + 1;
4087 assert(CachedFieldIndex && "failed to find field in parent");
4088 return CachedFieldIndex - 1;
4091 SourceRange FieldDecl::getSourceRange() const {
4092 const Expr *FinalExpr = getInClassInitializer();
4094 FinalExpr = getBitWidth();
4096 return SourceRange(getInnerLocStart(), FinalExpr->getEndLoc());
4097 return DeclaratorDecl::getSourceRange();
4100 void FieldDecl::setCapturedVLAType(const VariableArrayType *VLAType) {
4101 assert((getParent()->isLambda() || getParent()->isCapturedRecord()) &&
4102 "capturing type in non-lambda or captured record.");
4103 assert(InitStorage.getInt() == ISK_NoInit &&
4104 InitStorage.getPointer() == nullptr &&
4105 "bit width, initializer or captured type already set");
4106 InitStorage.setPointerAndInt(const_cast<VariableArrayType *>(VLAType),
4107 ISK_CapturedVLAType);
4110 //===----------------------------------------------------------------------===//
4111 // TagDecl Implementation
4112 //===----------------------------------------------------------------------===//
4114 TagDecl::TagDecl(Kind DK, TagKind TK, const ASTContext &C, DeclContext *DC,
4115 SourceLocation L, IdentifierInfo *Id, TagDecl *PrevDecl,
4116 SourceLocation StartL)
4117 : TypeDecl(DK, DC, L, Id, StartL), DeclContext(DK), redeclarable_base(C),
4118 TypedefNameDeclOrQualifier((TypedefNameDecl *)nullptr) {
4119 assert((DK != Enum || TK == TTK_Enum) &&
4120 "EnumDecl not matched with TTK_Enum");
4121 setPreviousDecl(PrevDecl);
4123 setCompleteDefinition(false);
4124 setBeingDefined(false);
4125 setEmbeddedInDeclarator(false);
4126 setFreeStanding(false);
4127 setCompleteDefinitionRequired(false);
4130 SourceLocation TagDecl::getOuterLocStart() const {
4131 return getTemplateOrInnerLocStart(this);
4134 SourceRange TagDecl::getSourceRange() const {
4135 SourceLocation RBraceLoc = BraceRange.getEnd();
4136 SourceLocation E = RBraceLoc.isValid() ? RBraceLoc : getLocation();
4137 return SourceRange(getOuterLocStart(), E);
4140 TagDecl *TagDecl::getCanonicalDecl() { return getFirstDecl(); }
4142 void TagDecl::setTypedefNameForAnonDecl(TypedefNameDecl *TDD) {
4143 TypedefNameDeclOrQualifier = TDD;
4144 if (const Type *T = getTypeForDecl()) {
4146 assert(T->isLinkageValid());
4148 assert(isLinkageValid());
4151 void TagDecl::startDefinition() {
4152 setBeingDefined(true);
4154 if (auto *D = dyn_cast<CXXRecordDecl>(this)) {
4155 struct CXXRecordDecl::DefinitionData *Data =
4156 new (getASTContext()) struct CXXRecordDecl::DefinitionData(D);
4157 for (auto I : redecls())
4158 cast<CXXRecordDecl>(I)->DefinitionData = Data;
4162 void TagDecl::completeDefinition() {
4163 assert((!isa<CXXRecordDecl>(this) ||
4164 cast<CXXRecordDecl>(this)->hasDefinition()) &&
4165 "definition completed but not started");
4167 setCompleteDefinition(true);
4168 setBeingDefined(false);
4170 if (ASTMutationListener *L = getASTMutationListener())
4171 L->CompletedTagDefinition(this);
4174 TagDecl *TagDecl::getDefinition() const {
4175 if (isCompleteDefinition())
4176 return const_cast<TagDecl *>(this);
4178 // If it's possible for us to have an out-of-date definition, check now.
4179 if (mayHaveOutOfDateDef()) {
4180 if (IdentifierInfo *II = getIdentifier()) {
4181 if (II->isOutOfDate()) {
4182 updateOutOfDate(*II);
4187 if (const auto *CXXRD = dyn_cast<CXXRecordDecl>(this))
4188 return CXXRD->getDefinition();
4190 for (auto R : redecls())
4191 if (R->isCompleteDefinition())
4197 void TagDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) {
4199 // Make sure the extended qualifier info is allocated.
4201 TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo;
4202 // Set qualifier info.
4203 getExtInfo()->QualifierLoc = QualifierLoc;
4205 // Here Qualifier == 0, i.e., we are removing the qualifier (if any).
4207 if (getExtInfo()->NumTemplParamLists == 0) {
4208 getASTContext().Deallocate(getExtInfo());
4209 TypedefNameDeclOrQualifier = (TypedefNameDecl *)nullptr;
4212 getExtInfo()->QualifierLoc = QualifierLoc;
4217 void TagDecl::setTemplateParameterListsInfo(
4218 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
4219 assert(!TPLists.empty());
4220 // Make sure the extended decl info is allocated.
4222 // Allocate external info struct.
4223 TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo;
4224 // Set the template parameter lists info.
4225 getExtInfo()->setTemplateParameterListsInfo(Context, TPLists);
4228 //===----------------------------------------------------------------------===//
4229 // EnumDecl Implementation
4230 //===----------------------------------------------------------------------===//
4232 EnumDecl::EnumDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
4233 SourceLocation IdLoc, IdentifierInfo *Id, EnumDecl *PrevDecl,
4234 bool Scoped, bool ScopedUsingClassTag, bool Fixed)
4235 : TagDecl(Enum, TTK_Enum, C, DC, IdLoc, Id, PrevDecl, StartLoc) {
4236 assert(Scoped || !ScopedUsingClassTag);
4237 IntegerType = nullptr;
4238 setNumPositiveBits(0);
4239 setNumNegativeBits(0);
4241 setScopedUsingClassTag(ScopedUsingClassTag);
4243 setHasODRHash(false);
4247 void EnumDecl::anchor() {}
4249 EnumDecl *EnumDecl::Create(ASTContext &C, DeclContext *DC,
4250 SourceLocation StartLoc, SourceLocation IdLoc,
4252 EnumDecl *PrevDecl, bool IsScoped,
4253 bool IsScopedUsingClassTag, bool IsFixed) {
4254 auto *Enum = new (C, DC) EnumDecl(C, DC, StartLoc, IdLoc, Id, PrevDecl,
4255 IsScoped, IsScopedUsingClassTag, IsFixed);
4256 Enum->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4257 C.getTypeDeclType(Enum, PrevDecl);
4261 EnumDecl *EnumDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4263 new (C, ID) EnumDecl(C, nullptr, SourceLocation(), SourceLocation(),
4264 nullptr, nullptr, false, false, false);
4265 Enum->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4269 SourceRange EnumDecl::getIntegerTypeRange() const {
4270 if (const TypeSourceInfo *TI = getIntegerTypeSourceInfo())
4271 return TI->getTypeLoc().getSourceRange();
4272 return SourceRange();
4275 void EnumDecl::completeDefinition(QualType NewType,
4276 QualType NewPromotionType,
4277 unsigned NumPositiveBits,
4278 unsigned NumNegativeBits) {
4279 assert(!isCompleteDefinition() && "Cannot redefine enums!");
4281 IntegerType = NewType.getTypePtr();
4282 PromotionType = NewPromotionType;
4283 setNumPositiveBits(NumPositiveBits);
4284 setNumNegativeBits(NumNegativeBits);
4285 TagDecl::completeDefinition();
4288 bool EnumDecl::isClosed() const {
4289 if (const auto *A = getAttr<EnumExtensibilityAttr>())
4290 return A->getExtensibility() == EnumExtensibilityAttr::Closed;
4294 bool EnumDecl::isClosedFlag() const {
4295 return isClosed() && hasAttr<FlagEnumAttr>();
4298 bool EnumDecl::isClosedNonFlag() const {
4299 return isClosed() && !hasAttr<FlagEnumAttr>();
4302 TemplateSpecializationKind EnumDecl::getTemplateSpecializationKind() const {
4303 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
4304 return MSI->getTemplateSpecializationKind();
4306 return TSK_Undeclared;
4309 void EnumDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
4310 SourceLocation PointOfInstantiation) {
4311 MemberSpecializationInfo *MSI = getMemberSpecializationInfo();
4312 assert(MSI && "Not an instantiated member enumeration?");
4313 MSI->setTemplateSpecializationKind(TSK);
4314 if (TSK != TSK_ExplicitSpecialization &&
4315 PointOfInstantiation.isValid() &&
4316 MSI->getPointOfInstantiation().isInvalid())
4317 MSI->setPointOfInstantiation(PointOfInstantiation);
4320 EnumDecl *EnumDecl::getTemplateInstantiationPattern() const {
4321 if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo()) {
4322 if (isTemplateInstantiation(MSInfo->getTemplateSpecializationKind())) {
4323 EnumDecl *ED = getInstantiatedFromMemberEnum();
4324 while (auto *NewED = ED->getInstantiatedFromMemberEnum())
4326 return getDefinitionOrSelf(ED);
4330 assert(!isTemplateInstantiation(getTemplateSpecializationKind()) &&
4331 "couldn't find pattern for enum instantiation");
4335 EnumDecl *EnumDecl::getInstantiatedFromMemberEnum() const {
4336 if (SpecializationInfo)
4337 return cast<EnumDecl>(SpecializationInfo->getInstantiatedFrom());
4342 void EnumDecl::setInstantiationOfMemberEnum(ASTContext &C, EnumDecl *ED,
4343 TemplateSpecializationKind TSK) {
4344 assert(!SpecializationInfo && "Member enum is already a specialization");
4345 SpecializationInfo = new (C) MemberSpecializationInfo(ED, TSK);
4348 unsigned EnumDecl::getODRHash() {
4353 Hash.AddEnumDecl(this);
4354 setHasODRHash(true);
4355 ODRHash = Hash.CalculateHash();
4359 //===----------------------------------------------------------------------===//
4360 // RecordDecl Implementation
4361 //===----------------------------------------------------------------------===//
4363 RecordDecl::RecordDecl(Kind DK, TagKind TK, const ASTContext &C,
4364 DeclContext *DC, SourceLocation StartLoc,
4365 SourceLocation IdLoc, IdentifierInfo *Id,
4366 RecordDecl *PrevDecl)
4367 : TagDecl(DK, TK, C, DC, IdLoc, Id, PrevDecl, StartLoc) {
4368 assert(classof(static_cast<Decl *>(this)) && "Invalid Kind!");
4369 setHasFlexibleArrayMember(false);
4370 setAnonymousStructOrUnion(false);
4371 setHasObjectMember(false);
4372 setHasVolatileMember(false);
4373 setHasLoadedFieldsFromExternalStorage(false);
4374 setNonTrivialToPrimitiveDefaultInitialize(false);
4375 setNonTrivialToPrimitiveCopy(false);
4376 setNonTrivialToPrimitiveDestroy(false);
4377 setHasNonTrivialToPrimitiveDefaultInitializeCUnion(false);
4378 setHasNonTrivialToPrimitiveDestructCUnion(false);
4379 setHasNonTrivialToPrimitiveCopyCUnion(false);
4380 setParamDestroyedInCallee(false);
4381 setArgPassingRestrictions(APK_CanPassInRegs);
4384 RecordDecl *RecordDecl::Create(const ASTContext &C, TagKind TK, DeclContext *DC,
4385 SourceLocation StartLoc, SourceLocation IdLoc,
4386 IdentifierInfo *Id, RecordDecl* PrevDecl) {
4387 RecordDecl *R = new (C, DC) RecordDecl(Record, TK, C, DC,
4388 StartLoc, IdLoc, Id, PrevDecl);
4389 R->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4391 C.getTypeDeclType(R, PrevDecl);
4395 RecordDecl *RecordDecl::CreateDeserialized(const ASTContext &C, unsigned ID) {
4397 new (C, ID) RecordDecl(Record, TTK_Struct, C, nullptr, SourceLocation(),
4398 SourceLocation(), nullptr, nullptr);
4399 R->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4403 bool RecordDecl::isInjectedClassName() const {
4404 return isImplicit() && getDeclName() && getDeclContext()->isRecord() &&
4405 cast<RecordDecl>(getDeclContext())->getDeclName() == getDeclName();
4408 bool RecordDecl::isLambda() const {
4409 if (auto RD = dyn_cast<CXXRecordDecl>(this))
4410 return RD->isLambda();
4414 bool RecordDecl::isCapturedRecord() const {
4415 return hasAttr<CapturedRecordAttr>();
4418 void RecordDecl::setCapturedRecord() {
4419 addAttr(CapturedRecordAttr::CreateImplicit(getASTContext()));
4422 bool RecordDecl::isOrContainsUnion() const {
4426 if (const RecordDecl *Def = getDefinition()) {
4427 for (const FieldDecl *FD : Def->fields()) {
4428 const RecordType *RT = FD->getType()->getAs<RecordType>();
4429 if (RT && RT->getDecl()->isOrContainsUnion())
4437 RecordDecl::field_iterator RecordDecl::field_begin() const {
4438 if (hasExternalLexicalStorage() && !hasLoadedFieldsFromExternalStorage())
4439 LoadFieldsFromExternalStorage();
4441 return field_iterator(decl_iterator(FirstDecl));
4444 /// completeDefinition - Notes that the definition of this type is now
4446 void RecordDecl::completeDefinition() {
4447 assert(!isCompleteDefinition() && "Cannot redefine record!");
4448 TagDecl::completeDefinition();
4451 /// isMsStruct - Get whether or not this record uses ms_struct layout.
4452 /// This which can be turned on with an attribute, pragma, or the
4453 /// -mms-bitfields command-line option.
4454 bool RecordDecl::isMsStruct(const ASTContext &C) const {
4455 return hasAttr<MSStructAttr>() || C.getLangOpts().MSBitfields == 1;
4458 void RecordDecl::LoadFieldsFromExternalStorage() const {
4459 ExternalASTSource *Source = getASTContext().getExternalSource();
4460 assert(hasExternalLexicalStorage() && Source && "No external storage?");
4462 // Notify that we have a RecordDecl doing some initialization.
4463 ExternalASTSource::Deserializing TheFields(Source);
4465 SmallVector<Decl*, 64> Decls;
4466 setHasLoadedFieldsFromExternalStorage(true);
4467 Source->FindExternalLexicalDecls(this, [](Decl::Kind K) {
4468 return FieldDecl::classofKind(K) || IndirectFieldDecl::classofKind(K);
4472 // Check that all decls we got were FieldDecls.
4473 for (unsigned i=0, e=Decls.size(); i != e; ++i)
4474 assert(isa<FieldDecl>(Decls[i]) || isa<IndirectFieldDecl>(Decls[i]));
4480 std::tie(FirstDecl, LastDecl) = BuildDeclChain(Decls,
4481 /*FieldsAlreadyLoaded=*/false);
4484 bool RecordDecl::mayInsertExtraPadding(bool EmitRemark) const {
4485 ASTContext &Context = getASTContext();
4486 const SanitizerMask EnabledAsanMask = Context.getLangOpts().Sanitize.Mask &
4487 (SanitizerKind::Address | SanitizerKind::KernelAddress);
4488 if (!EnabledAsanMask || !Context.getLangOpts().SanitizeAddressFieldPadding)
4490 const auto &Blacklist = Context.getSanitizerBlacklist();
4491 const auto *CXXRD = dyn_cast<CXXRecordDecl>(this);
4492 // We may be able to relax some of these requirements.
4493 int ReasonToReject = -1;
4494 if (!CXXRD || CXXRD->isExternCContext())
4495 ReasonToReject = 0; // is not C++.
4496 else if (CXXRD->hasAttr<PackedAttr>())
4497 ReasonToReject = 1; // is packed.
4498 else if (CXXRD->isUnion())
4499 ReasonToReject = 2; // is a union.
4500 else if (CXXRD->isTriviallyCopyable())
4501 ReasonToReject = 3; // is trivially copyable.
4502 else if (CXXRD->hasTrivialDestructor())
4503 ReasonToReject = 4; // has trivial destructor.
4504 else if (CXXRD->isStandardLayout())
4505 ReasonToReject = 5; // is standard layout.
4506 else if (Blacklist.isBlacklistedLocation(EnabledAsanMask, getLocation(),
4508 ReasonToReject = 6; // is in an excluded file.
4509 else if (Blacklist.isBlacklistedType(EnabledAsanMask,
4510 getQualifiedNameAsString(),
4512 ReasonToReject = 7; // The type is excluded.
4515 if (ReasonToReject >= 0)
4516 Context.getDiagnostics().Report(
4518 diag::remark_sanitize_address_insert_extra_padding_rejected)
4519 << getQualifiedNameAsString() << ReasonToReject;
4521 Context.getDiagnostics().Report(
4523 diag::remark_sanitize_address_insert_extra_padding_accepted)
4524 << getQualifiedNameAsString();
4526 return ReasonToReject < 0;
4529 const FieldDecl *RecordDecl::findFirstNamedDataMember() const {
4530 for (const auto *I : fields()) {
4531 if (I->getIdentifier())
4534 if (const auto *RT = I->getType()->getAs<RecordType>())
4535 if (const FieldDecl *NamedDataMember =
4536 RT->getDecl()->findFirstNamedDataMember())
4537 return NamedDataMember;
4540 // We didn't find a named data member.
4544 //===----------------------------------------------------------------------===//
4545 // BlockDecl Implementation
4546 //===----------------------------------------------------------------------===//
4548 BlockDecl::BlockDecl(DeclContext *DC, SourceLocation CaretLoc)
4549 : Decl(Block, DC, CaretLoc), DeclContext(Block) {
4550 setIsVariadic(false);
4551 setCapturesCXXThis(false);
4552 setBlockMissingReturnType(true);
4553 setIsConversionFromLambda(false);
4554 setDoesNotEscape(false);
4555 setCanAvoidCopyToHeap(false);
4558 void BlockDecl::setParams(ArrayRef<ParmVarDecl *> NewParamInfo) {
4559 assert(!ParamInfo && "Already has param info!");
4561 // Zero params -> null pointer.
4562 if (!NewParamInfo.empty()) {
4563 NumParams = NewParamInfo.size();
4564 ParamInfo = new (getASTContext()) ParmVarDecl*[NewParamInfo.size()];
4565 std::copy(NewParamInfo.begin(), NewParamInfo.end(), ParamInfo);
4569 void BlockDecl::setCaptures(ASTContext &Context, ArrayRef<Capture> Captures,
4570 bool CapturesCXXThis) {
4571 this->setCapturesCXXThis(CapturesCXXThis);
4572 this->NumCaptures = Captures.size();
4574 if (Captures.empty()) {
4575 this->Captures = nullptr;
4579 this->Captures = Captures.copy(Context).data();
4582 bool BlockDecl::capturesVariable(const VarDecl *variable) const {
4583 for (const auto &I : captures())
4584 // Only auto vars can be captured, so no redeclaration worries.
4585 if (I.getVariable() == variable)
4591 SourceRange BlockDecl::getSourceRange() const {
4592 return SourceRange(getLocation(), Body ? Body->getEndLoc() : getLocation());
4595 //===----------------------------------------------------------------------===//
4596 // Other Decl Allocation/Deallocation Method Implementations
4597 //===----------------------------------------------------------------------===//
4599 void TranslationUnitDecl::anchor() {}
4601 TranslationUnitDecl *TranslationUnitDecl::Create(ASTContext &C) {
4602 return new (C, (DeclContext *)nullptr) TranslationUnitDecl(C);
4605 void PragmaCommentDecl::anchor() {}
4607 PragmaCommentDecl *PragmaCommentDecl::Create(const ASTContext &C,
4608 TranslationUnitDecl *DC,
4609 SourceLocation CommentLoc,
4610 PragmaMSCommentKind CommentKind,
4612 PragmaCommentDecl *PCD =
4613 new (C, DC, additionalSizeToAlloc<char>(Arg.size() + 1))
4614 PragmaCommentDecl(DC, CommentLoc, CommentKind);
4615 memcpy(PCD->getTrailingObjects<char>(), Arg.data(), Arg.size());
4616 PCD->getTrailingObjects<char>()[Arg.size()] = '\0';
4620 PragmaCommentDecl *PragmaCommentDecl::CreateDeserialized(ASTContext &C,
4623 return new (C, ID, additionalSizeToAlloc<char>(ArgSize + 1))
4624 PragmaCommentDecl(nullptr, SourceLocation(), PCK_Unknown);
4627 void PragmaDetectMismatchDecl::anchor() {}
4629 PragmaDetectMismatchDecl *
4630 PragmaDetectMismatchDecl::Create(const ASTContext &C, TranslationUnitDecl *DC,
4631 SourceLocation Loc, StringRef Name,
4633 size_t ValueStart = Name.size() + 1;
4634 PragmaDetectMismatchDecl *PDMD =
4635 new (C, DC, additionalSizeToAlloc<char>(ValueStart + Value.size() + 1))
4636 PragmaDetectMismatchDecl(DC, Loc, ValueStart);
4637 memcpy(PDMD->getTrailingObjects<char>(), Name.data(), Name.size());
4638 PDMD->getTrailingObjects<char>()[Name.size()] = '\0';
4639 memcpy(PDMD->getTrailingObjects<char>() + ValueStart, Value.data(),
4641 PDMD->getTrailingObjects<char>()[ValueStart + Value.size()] = '\0';
4645 PragmaDetectMismatchDecl *
4646 PragmaDetectMismatchDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4647 unsigned NameValueSize) {
4648 return new (C, ID, additionalSizeToAlloc<char>(NameValueSize + 1))
4649 PragmaDetectMismatchDecl(nullptr, SourceLocation(), 0);
4652 void ExternCContextDecl::anchor() {}
4654 ExternCContextDecl *ExternCContextDecl::Create(const ASTContext &C,
4655 TranslationUnitDecl *DC) {
4656 return new (C, DC) ExternCContextDecl(DC);
4659 void LabelDecl::anchor() {}
4661 LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC,
4662 SourceLocation IdentL, IdentifierInfo *II) {
4663 return new (C, DC) LabelDecl(DC, IdentL, II, nullptr, IdentL);
4666 LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC,
4667 SourceLocation IdentL, IdentifierInfo *II,
4668 SourceLocation GnuLabelL) {
4669 assert(GnuLabelL != IdentL && "Use this only for GNU local labels");
4670 return new (C, DC) LabelDecl(DC, IdentL, II, nullptr, GnuLabelL);
4673 LabelDecl *LabelDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4674 return new (C, ID) LabelDecl(nullptr, SourceLocation(), nullptr, nullptr,
4678 void LabelDecl::setMSAsmLabel(StringRef Name) {
4679 char *Buffer = new (getASTContext(), 1) char[Name.size() + 1];
4680 memcpy(Buffer, Name.data(), Name.size());
4681 Buffer[Name.size()] = '\0';
4685 void ValueDecl::anchor() {}
4687 bool ValueDecl::isWeak() const {
4688 for (const auto *I : attrs())
4689 if (isa<WeakAttr>(I) || isa<WeakRefAttr>(I))
4692 return isWeakImported();
4695 void ImplicitParamDecl::anchor() {}
4697 ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, DeclContext *DC,
4698 SourceLocation IdLoc,
4699 IdentifierInfo *Id, QualType Type,
4700 ImplicitParamKind ParamKind) {
4701 return new (C, DC) ImplicitParamDecl(C, DC, IdLoc, Id, Type, ParamKind);
4704 ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, QualType Type,
4705 ImplicitParamKind ParamKind) {
4706 return new (C, nullptr) ImplicitParamDecl(C, Type, ParamKind);
4709 ImplicitParamDecl *ImplicitParamDecl::CreateDeserialized(ASTContext &C,
4711 return new (C, ID) ImplicitParamDecl(C, QualType(), ImplicitParamKind::Other);
4714 FunctionDecl *FunctionDecl::Create(ASTContext &C, DeclContext *DC,
4715 SourceLocation StartLoc,
4716 const DeclarationNameInfo &NameInfo,
4717 QualType T, TypeSourceInfo *TInfo,
4718 StorageClass SC, bool isInlineSpecified,
4719 bool hasWrittenPrototype,
4720 ConstexprSpecKind ConstexprKind,
4721 Expr *TrailingRequiresClause) {
4723 new (C, DC) FunctionDecl(Function, C, DC, StartLoc, NameInfo, T, TInfo,
4724 SC, isInlineSpecified, ConstexprKind,
4725 TrailingRequiresClause);
4726 New->setHasWrittenPrototype(hasWrittenPrototype);
4730 FunctionDecl *FunctionDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4731 return new (C, ID) FunctionDecl(Function, C, nullptr, SourceLocation(),
4732 DeclarationNameInfo(), QualType(), nullptr,
4733 SC_None, false, CSK_unspecified, nullptr);
4736 BlockDecl *BlockDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) {
4737 return new (C, DC) BlockDecl(DC, L);
4740 BlockDecl *BlockDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4741 return new (C, ID) BlockDecl(nullptr, SourceLocation());
4744 CapturedDecl::CapturedDecl(DeclContext *DC, unsigned NumParams)
4745 : Decl(Captured, DC, SourceLocation()), DeclContext(Captured),
4746 NumParams(NumParams), ContextParam(0), BodyAndNothrow(nullptr, false) {}
4748 CapturedDecl *CapturedDecl::Create(ASTContext &C, DeclContext *DC,
4749 unsigned NumParams) {
4750 return new (C, DC, additionalSizeToAlloc<ImplicitParamDecl *>(NumParams))
4751 CapturedDecl(DC, NumParams);
4754 CapturedDecl *CapturedDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4755 unsigned NumParams) {
4756 return new (C, ID, additionalSizeToAlloc<ImplicitParamDecl *>(NumParams))
4757 CapturedDecl(nullptr, NumParams);
4760 Stmt *CapturedDecl::getBody() const { return BodyAndNothrow.getPointer(); }
4761 void CapturedDecl::setBody(Stmt *B) { BodyAndNothrow.setPointer(B); }
4763 bool CapturedDecl::isNothrow() const { return BodyAndNothrow.getInt(); }
4764 void CapturedDecl::setNothrow(bool Nothrow) { BodyAndNothrow.setInt(Nothrow); }
4766 EnumConstantDecl *EnumConstantDecl::Create(ASTContext &C, EnumDecl *CD,
4768 IdentifierInfo *Id, QualType T,
4769 Expr *E, const llvm::APSInt &V) {
4770 return new (C, CD) EnumConstantDecl(CD, L, Id, T, E, V);
4774 EnumConstantDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4775 return new (C, ID) EnumConstantDecl(nullptr, SourceLocation(), nullptr,
4776 QualType(), nullptr, llvm::APSInt());
4779 void IndirectFieldDecl::anchor() {}
4781 IndirectFieldDecl::IndirectFieldDecl(ASTContext &C, DeclContext *DC,
4782 SourceLocation L, DeclarationName N,
4784 MutableArrayRef<NamedDecl *> CH)
4785 : ValueDecl(IndirectField, DC, L, N, T), Chaining(CH.data()),
4786 ChainingSize(CH.size()) {
4787 // In C++, indirect field declarations conflict with tag declarations in the
4788 // same scope, so add them to IDNS_Tag so that tag redeclaration finds them.
4789 if (C.getLangOpts().CPlusPlus)
4790 IdentifierNamespace |= IDNS_Tag;
4794 IndirectFieldDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L,
4795 IdentifierInfo *Id, QualType T,
4796 llvm::MutableArrayRef<NamedDecl *> CH) {
4797 return new (C, DC) IndirectFieldDecl(C, DC, L, Id, T, CH);
4800 IndirectFieldDecl *IndirectFieldDecl::CreateDeserialized(ASTContext &C,
4802 return new (C, ID) IndirectFieldDecl(C, nullptr, SourceLocation(),
4803 DeclarationName(), QualType(), None);
4806 SourceRange EnumConstantDecl::getSourceRange() const {
4807 SourceLocation End = getLocation();
4809 End = Init->getEndLoc();
4810 return SourceRange(getLocation(), End);
4813 void TypeDecl::anchor() {}
4815 TypedefDecl *TypedefDecl::Create(ASTContext &C, DeclContext *DC,
4816 SourceLocation StartLoc, SourceLocation IdLoc,
4817 IdentifierInfo *Id, TypeSourceInfo *TInfo) {
4818 return new (C, DC) TypedefDecl(C, DC, StartLoc, IdLoc, Id, TInfo);
4821 void TypedefNameDecl::anchor() {}
4823 TagDecl *TypedefNameDecl::getAnonDeclWithTypedefName(bool AnyRedecl) const {
4824 if (auto *TT = getTypeSourceInfo()->getType()->getAs<TagType>()) {
4825 auto *OwningTypedef = TT->getDecl()->getTypedefNameForAnonDecl();
4826 auto *ThisTypedef = this;
4827 if (AnyRedecl && OwningTypedef) {
4828 OwningTypedef = OwningTypedef->getCanonicalDecl();
4829 ThisTypedef = ThisTypedef->getCanonicalDecl();
4831 if (OwningTypedef == ThisTypedef)
4832 return TT->getDecl();
4838 bool TypedefNameDecl::isTransparentTagSlow() const {
4839 auto determineIsTransparent = [&]() {
4840 if (auto *TT = getUnderlyingType()->getAs<TagType>()) {
4841 if (auto *TD = TT->getDecl()) {
4842 if (TD->getName() != getName())
4844 SourceLocation TTLoc = getLocation();
4845 SourceLocation TDLoc = TD->getLocation();
4846 if (!TTLoc.isMacroID() || !TDLoc.isMacroID())
4848 SourceManager &SM = getASTContext().getSourceManager();
4849 return SM.getSpellingLoc(TTLoc) == SM.getSpellingLoc(TDLoc);
4855 bool isTransparent = determineIsTransparent();
4856 MaybeModedTInfo.setInt((isTransparent << 1) | 1);
4857 return isTransparent;
4860 TypedefDecl *TypedefDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4861 return new (C, ID) TypedefDecl(C, nullptr, SourceLocation(), SourceLocation(),
4865 TypeAliasDecl *TypeAliasDecl::Create(ASTContext &C, DeclContext *DC,
4866 SourceLocation StartLoc,
4867 SourceLocation IdLoc, IdentifierInfo *Id,
4868 TypeSourceInfo *TInfo) {
4869 return new (C, DC) TypeAliasDecl(C, DC, StartLoc, IdLoc, Id, TInfo);
4872 TypeAliasDecl *TypeAliasDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4873 return new (C, ID) TypeAliasDecl(C, nullptr, SourceLocation(),
4874 SourceLocation(), nullptr, nullptr);
4877 SourceRange TypedefDecl::getSourceRange() const {
4878 SourceLocation RangeEnd = getLocation();
4879 if (TypeSourceInfo *TInfo = getTypeSourceInfo()) {
4880 if (typeIsPostfix(TInfo->getType()))
4881 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
4883 return SourceRange(getBeginLoc(), RangeEnd);
4886 SourceRange TypeAliasDecl::getSourceRange() const {
4887 SourceLocation RangeEnd = getBeginLoc();
4888 if (TypeSourceInfo *TInfo = getTypeSourceInfo())
4889 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
4890 return SourceRange(getBeginLoc(), RangeEnd);
4893 void FileScopeAsmDecl::anchor() {}
4895 FileScopeAsmDecl *FileScopeAsmDecl::Create(ASTContext &C, DeclContext *DC,
4897 SourceLocation AsmLoc,
4898 SourceLocation RParenLoc) {
4899 return new (C, DC) FileScopeAsmDecl(DC, Str, AsmLoc, RParenLoc);
4902 FileScopeAsmDecl *FileScopeAsmDecl::CreateDeserialized(ASTContext &C,
4904 return new (C, ID) FileScopeAsmDecl(nullptr, nullptr, SourceLocation(),
4908 void EmptyDecl::anchor() {}
4910 EmptyDecl *EmptyDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) {
4911 return new (C, DC) EmptyDecl(DC, L);
4914 EmptyDecl *EmptyDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4915 return new (C, ID) EmptyDecl(nullptr, SourceLocation());
4918 //===----------------------------------------------------------------------===//
4919 // ImportDecl Implementation
4920 //===----------------------------------------------------------------------===//
4922 /// Retrieve the number of module identifiers needed to name the given
4924 static unsigned getNumModuleIdentifiers(Module *Mod) {
4925 unsigned Result = 1;
4926 while (Mod->Parent) {
4933 ImportDecl::ImportDecl(DeclContext *DC, SourceLocation StartLoc,
4935 ArrayRef<SourceLocation> IdentifierLocs)
4936 : Decl(Import, DC, StartLoc), ImportedModule(Imported),
4937 NextLocalImportAndComplete(nullptr, true) {
4938 assert(getNumModuleIdentifiers(Imported) == IdentifierLocs.size());
4939 auto *StoredLocs = getTrailingObjects<SourceLocation>();
4940 std::uninitialized_copy(IdentifierLocs.begin(), IdentifierLocs.end(),
4944 ImportDecl::ImportDecl(DeclContext *DC, SourceLocation StartLoc,
4945 Module *Imported, SourceLocation EndLoc)
4946 : Decl(Import, DC, StartLoc), ImportedModule(Imported),
4947 NextLocalImportAndComplete(nullptr, false) {
4948 *getTrailingObjects<SourceLocation>() = EndLoc;
4951 ImportDecl *ImportDecl::Create(ASTContext &C, DeclContext *DC,
4952 SourceLocation StartLoc, Module *Imported,
4953 ArrayRef<SourceLocation> IdentifierLocs) {
4955 additionalSizeToAlloc<SourceLocation>(IdentifierLocs.size()))
4956 ImportDecl(DC, StartLoc, Imported, IdentifierLocs);
4959 ImportDecl *ImportDecl::CreateImplicit(ASTContext &C, DeclContext *DC,
4960 SourceLocation StartLoc,
4962 SourceLocation EndLoc) {
4963 ImportDecl *Import = new (C, DC, additionalSizeToAlloc<SourceLocation>(1))
4964 ImportDecl(DC, StartLoc, Imported, EndLoc);
4965 Import->setImplicit();
4969 ImportDecl *ImportDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4970 unsigned NumLocations) {
4971 return new (C, ID, additionalSizeToAlloc<SourceLocation>(NumLocations))
4972 ImportDecl(EmptyShell());
4975 ArrayRef<SourceLocation> ImportDecl::getIdentifierLocs() const {
4976 if (!isImportComplete())
4979 const auto *StoredLocs = getTrailingObjects<SourceLocation>();
4980 return llvm::makeArrayRef(StoredLocs,
4981 getNumModuleIdentifiers(getImportedModule()));
4984 SourceRange ImportDecl::getSourceRange() const {
4985 if (!isImportComplete())
4986 return SourceRange(getLocation(), *getTrailingObjects<SourceLocation>());
4988 return SourceRange(getLocation(), getIdentifierLocs().back());
4991 //===----------------------------------------------------------------------===//
4992 // ExportDecl Implementation
4993 //===----------------------------------------------------------------------===//
4995 void ExportDecl::anchor() {}
4997 ExportDecl *ExportDecl::Create(ASTContext &C, DeclContext *DC,
4998 SourceLocation ExportLoc) {
4999 return new (C, DC) ExportDecl(DC, ExportLoc);
5002 ExportDecl *ExportDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
5003 return new (C, ID) ExportDecl(nullptr, SourceLocation());