1 //===--- Decl.cpp - Declaration AST Node Implementation -------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Decl subclasses.
12 //===----------------------------------------------------------------------===//
14 #include "clang/AST/Decl.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/ASTLambda.h"
17 #include "clang/AST/ASTMutationListener.h"
18 #include "clang/AST/Attr.h"
19 #include "clang/AST/DeclCXX.h"
20 #include "clang/AST/DeclObjC.h"
21 #include "clang/AST/DeclOpenMP.h"
22 #include "clang/AST/DeclTemplate.h"
23 #include "clang/AST/Expr.h"
24 #include "clang/AST/ExprCXX.h"
25 #include "clang/AST/PrettyPrinter.h"
26 #include "clang/AST/Stmt.h"
27 #include "clang/AST/TypeLoc.h"
28 #include "clang/Basic/Builtins.h"
29 #include "clang/Basic/IdentifierTable.h"
30 #include "clang/Basic/Module.h"
31 #include "clang/Basic/Specifiers.h"
32 #include "clang/Basic/TargetInfo.h"
33 #include "clang/Frontend/FrontendDiagnostic.h"
34 #include "llvm/Support/ErrorHandling.h"
37 using namespace clang;
39 Decl *clang::getPrimaryMergedDecl(Decl *D) {
40 return D->getASTContext().getPrimaryMergedDecl(D);
43 // Defined here so that it can be inlined into its direct callers.
44 bool Decl::isOutOfLine() const {
45 return !getLexicalDeclContext()->Equals(getDeclContext());
48 TranslationUnitDecl::TranslationUnitDecl(ASTContext &ctx)
49 : Decl(TranslationUnit, nullptr, SourceLocation()),
50 DeclContext(TranslationUnit), Ctx(ctx), AnonymousNamespace(nullptr) {
51 Hidden = Ctx.getLangOpts().ModulesLocalVisibility;
54 //===----------------------------------------------------------------------===//
55 // NamedDecl Implementation
56 //===----------------------------------------------------------------------===//
58 // Visibility rules aren't rigorously externally specified, but here
59 // are the basic principles behind what we implement:
61 // 1. An explicit visibility attribute is generally a direct expression
62 // of the user's intent and should be honored. Only the innermost
63 // visibility attribute applies. If no visibility attribute applies,
64 // global visibility settings are considered.
66 // 2. There is one caveat to the above: on or in a template pattern,
67 // an explicit visibility attribute is just a default rule, and
68 // visibility can be decreased by the visibility of template
69 // arguments. But this, too, has an exception: an attribute on an
70 // explicit specialization or instantiation causes all the visibility
71 // restrictions of the template arguments to be ignored.
73 // 3. A variable that does not otherwise have explicit visibility can
74 // be restricted by the visibility of its type.
76 // 4. A visibility restriction is explicit if it comes from an
77 // attribute (or something like it), not a global visibility setting.
78 // When emitting a reference to an external symbol, visibility
79 // restrictions are ignored unless they are explicit.
81 // 5. When computing the visibility of a non-type, including a
82 // non-type member of a class, only non-type visibility restrictions
83 // are considered: the 'visibility' attribute, global value-visibility
84 // settings, and a few special cases like __private_extern.
86 // 6. When computing the visibility of a type, including a type member
87 // of a class, only type visibility restrictions are considered:
88 // the 'type_visibility' attribute and global type-visibility settings.
89 // However, a 'visibility' attribute counts as a 'type_visibility'
90 // attribute on any declaration that only has the former.
92 // The visibility of a "secondary" entity, like a template argument,
93 // is computed using the kind of that entity, not the kind of the
94 // primary entity for which we are computing visibility. For example,
95 // the visibility of a specialization of either of these templates:
96 // template <class T, bool (&compare)(T, X)> bool has_match(list<T>, X);
97 // template <class T, bool (&compare)(T, X)> class matcher;
98 // is restricted according to the type visibility of the argument 'T',
99 // the type visibility of 'bool(&)(T,X)', and the value visibility of
100 // the argument function 'compare'. That 'has_match' is a value
101 // and 'matcher' is a type only matters when looking for attributes
102 // and settings from the immediate context.
104 const unsigned IgnoreExplicitVisibilityBit = 2;
105 const unsigned IgnoreAllVisibilityBit = 4;
107 /// Kinds of LV computation. The linkage side of the computation is
108 /// always the same, but different things can change how visibility is
110 enum LVComputationKind {
111 /// Do an LV computation for, ultimately, a type.
112 /// Visibility may be restricted by type visibility settings and
113 /// the visibility of template arguments.
114 LVForType = NamedDecl::VisibilityForType,
116 /// Do an LV computation for, ultimately, a non-type declaration.
117 /// Visibility may be restricted by value visibility settings and
118 /// the visibility of template arguments.
119 LVForValue = NamedDecl::VisibilityForValue,
121 /// Do an LV computation for, ultimately, a type that already has
122 /// some sort of explicit visibility. Visibility may only be
123 /// restricted by the visibility of template arguments.
124 LVForExplicitType = (LVForType | IgnoreExplicitVisibilityBit),
126 /// Do an LV computation for, ultimately, a non-type declaration
127 /// that already has some sort of explicit visibility. Visibility
128 /// may only be restricted by the visibility of template arguments.
129 LVForExplicitValue = (LVForValue | IgnoreExplicitVisibilityBit),
131 /// Do an LV computation when we only care about the linkage.
133 LVForValue | IgnoreExplicitVisibilityBit | IgnoreAllVisibilityBit
136 /// Does this computation kind permit us to consider additional
137 /// visibility settings from attributes and the like?
138 static bool hasExplicitVisibilityAlready(LVComputationKind computation) {
139 return ((unsigned(computation) & IgnoreExplicitVisibilityBit) != 0);
142 /// Given an LVComputationKind, return one of the same type/value sort
143 /// that records that it already has explicit visibility.
144 static LVComputationKind
145 withExplicitVisibilityAlready(LVComputationKind oldKind) {
146 LVComputationKind newKind =
147 static_cast<LVComputationKind>(unsigned(oldKind) |
148 IgnoreExplicitVisibilityBit);
149 assert(oldKind != LVForType || newKind == LVForExplicitType);
150 assert(oldKind != LVForValue || newKind == LVForExplicitValue);
151 assert(oldKind != LVForExplicitType || newKind == LVForExplicitType);
152 assert(oldKind != LVForExplicitValue || newKind == LVForExplicitValue);
156 static Optional<Visibility> getExplicitVisibility(const NamedDecl *D,
157 LVComputationKind kind) {
158 assert(!hasExplicitVisibilityAlready(kind) &&
159 "asking for explicit visibility when we shouldn't be");
160 return D->getExplicitVisibility((NamedDecl::ExplicitVisibilityKind) kind);
163 /// Is the given declaration a "type" or a "value" for the purposes of
164 /// visibility computation?
165 static bool usesTypeVisibility(const NamedDecl *D) {
166 return isa<TypeDecl>(D) ||
167 isa<ClassTemplateDecl>(D) ||
168 isa<ObjCInterfaceDecl>(D);
171 /// Does the given declaration have member specialization information,
172 /// and if so, is it an explicit specialization?
173 template <class T> static typename
174 std::enable_if<!std::is_base_of<RedeclarableTemplateDecl, T>::value, bool>::type
175 isExplicitMemberSpecialization(const T *D) {
176 if (const MemberSpecializationInfo *member =
177 D->getMemberSpecializationInfo()) {
178 return member->isExplicitSpecialization();
183 /// For templates, this question is easier: a member template can't be
184 /// explicitly instantiated, so there's a single bit indicating whether
185 /// or not this is an explicit member specialization.
186 static bool isExplicitMemberSpecialization(const RedeclarableTemplateDecl *D) {
187 return D->isMemberSpecialization();
190 /// Given a visibility attribute, return the explicit visibility
191 /// associated with it.
193 static Visibility getVisibilityFromAttr(const T *attr) {
194 switch (attr->getVisibility()) {
196 return DefaultVisibility;
198 return HiddenVisibility;
200 return ProtectedVisibility;
202 llvm_unreachable("bad visibility kind");
205 /// Return the explicit visibility of the given declaration.
206 static Optional<Visibility> getVisibilityOf(const NamedDecl *D,
207 NamedDecl::ExplicitVisibilityKind kind) {
208 // If we're ultimately computing the visibility of a type, look for
209 // a 'type_visibility' attribute before looking for 'visibility'.
210 if (kind == NamedDecl::VisibilityForType) {
211 if (const auto *A = D->getAttr<TypeVisibilityAttr>()) {
212 return getVisibilityFromAttr(A);
216 // If this declaration has an explicit visibility attribute, use it.
217 if (const auto *A = D->getAttr<VisibilityAttr>()) {
218 return getVisibilityFromAttr(A);
221 // If we're on Mac OS X, an 'availability' for Mac OS X attribute
222 // implies visibility(default).
223 if (D->getASTContext().getTargetInfo().getTriple().isOSDarwin()) {
224 for (const auto *A : D->specific_attrs<AvailabilityAttr>())
225 if (A->getPlatform()->getName().equals("macos"))
226 return DefaultVisibility;
233 getLVForType(const Type &T, LVComputationKind computation) {
234 if (computation == LVForLinkageOnly)
235 return LinkageInfo(T.getLinkage(), DefaultVisibility, true);
236 return T.getLinkageAndVisibility();
239 /// \brief Get the most restrictive linkage for the types in the given
240 /// template parameter list. For visibility purposes, template
241 /// parameters are part of the signature of a template.
243 getLVForTemplateParameterList(const TemplateParameterList *Params,
244 LVComputationKind computation) {
246 for (const NamedDecl *P : *Params) {
247 // Template type parameters are the most common and never
248 // contribute to visibility, pack or not.
249 if (isa<TemplateTypeParmDecl>(P))
252 // Non-type template parameters can be restricted by the value type, e.g.
253 // template <enum X> class A { ... };
254 // We have to be careful here, though, because we can be dealing with
256 if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) {
257 // Handle the non-pack case first.
258 if (!NTTP->isExpandedParameterPack()) {
259 if (!NTTP->getType()->isDependentType()) {
260 LV.merge(getLVForType(*NTTP->getType(), computation));
265 // Look at all the types in an expanded pack.
266 for (unsigned i = 0, n = NTTP->getNumExpansionTypes(); i != n; ++i) {
267 QualType type = NTTP->getExpansionType(i);
268 if (!type->isDependentType())
269 LV.merge(type->getLinkageAndVisibility());
274 // Template template parameters can be restricted by their
275 // template parameters, recursively.
276 const auto *TTP = cast<TemplateTemplateParmDecl>(P);
278 // Handle the non-pack case first.
279 if (!TTP->isExpandedParameterPack()) {
280 LV.merge(getLVForTemplateParameterList(TTP->getTemplateParameters(),
285 // Look at all expansions in an expanded pack.
286 for (unsigned i = 0, n = TTP->getNumExpansionTemplateParameters();
288 LV.merge(getLVForTemplateParameterList(
289 TTP->getExpansionTemplateParameters(i), computation));
296 /// getLVForDecl - Get the linkage and visibility for the given declaration.
297 static LinkageInfo getLVForDecl(const NamedDecl *D,
298 LVComputationKind computation);
300 static const Decl *getOutermostFuncOrBlockContext(const Decl *D) {
301 const Decl *Ret = nullptr;
302 const DeclContext *DC = D->getDeclContext();
303 while (DC->getDeclKind() != Decl::TranslationUnit) {
304 if (isa<FunctionDecl>(DC) || isa<BlockDecl>(DC))
305 Ret = cast<Decl>(DC);
306 DC = DC->getParent();
311 /// \brief Get the most restrictive linkage for the types and
312 /// declarations in the given template argument list.
314 /// Note that we don't take an LVComputationKind because we always
315 /// want to honor the visibility of template arguments in the same way.
316 static LinkageInfo getLVForTemplateArgumentList(ArrayRef<TemplateArgument> Args,
317 LVComputationKind computation) {
320 for (const TemplateArgument &Arg : Args) {
321 switch (Arg.getKind()) {
322 case TemplateArgument::Null:
323 case TemplateArgument::Integral:
324 case TemplateArgument::Expression:
327 case TemplateArgument::Type:
328 LV.merge(getLVForType(*Arg.getAsType(), computation));
331 case TemplateArgument::Declaration:
332 if (const auto *ND = dyn_cast<NamedDecl>(Arg.getAsDecl())) {
333 assert(!usesTypeVisibility(ND));
334 LV.merge(getLVForDecl(ND, computation));
338 case TemplateArgument::NullPtr:
339 LV.merge(Arg.getNullPtrType()->getLinkageAndVisibility());
342 case TemplateArgument::Template:
343 case TemplateArgument::TemplateExpansion:
344 if (TemplateDecl *Template =
345 Arg.getAsTemplateOrTemplatePattern().getAsTemplateDecl())
346 LV.merge(getLVForDecl(Template, computation));
349 case TemplateArgument::Pack:
350 LV.merge(getLVForTemplateArgumentList(Arg.getPackAsArray(), computation));
353 llvm_unreachable("bad template argument kind");
360 getLVForTemplateArgumentList(const TemplateArgumentList &TArgs,
361 LVComputationKind computation) {
362 return getLVForTemplateArgumentList(TArgs.asArray(), computation);
365 static bool shouldConsiderTemplateVisibility(const FunctionDecl *fn,
366 const FunctionTemplateSpecializationInfo *specInfo) {
367 // Include visibility from the template parameters and arguments
368 // only if this is not an explicit instantiation or specialization
369 // with direct explicit visibility. (Implicit instantiations won't
370 // have a direct attribute.)
371 if (!specInfo->isExplicitInstantiationOrSpecialization())
374 return !fn->hasAttr<VisibilityAttr>();
377 /// Merge in template-related linkage and visibility for the given
378 /// function template specialization.
380 /// We don't need a computation kind here because we can assume
383 /// \param[out] LV the computation to use for the parent
385 mergeTemplateLV(LinkageInfo &LV, const FunctionDecl *fn,
386 const FunctionTemplateSpecializationInfo *specInfo,
387 LVComputationKind computation) {
388 bool considerVisibility =
389 shouldConsiderTemplateVisibility(fn, specInfo);
391 // Merge information from the template parameters.
392 FunctionTemplateDecl *temp = specInfo->getTemplate();
394 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
395 LV.mergeMaybeWithVisibility(tempLV, considerVisibility);
397 // Merge information from the template arguments.
398 const TemplateArgumentList &templateArgs = *specInfo->TemplateArguments;
399 LinkageInfo argsLV = getLVForTemplateArgumentList(templateArgs, computation);
400 LV.mergeMaybeWithVisibility(argsLV, considerVisibility);
403 /// Does the given declaration have a direct visibility attribute
404 /// that would match the given rules?
405 static bool hasDirectVisibilityAttribute(const NamedDecl *D,
406 LVComputationKind computation) {
407 switch (computation) {
409 case LVForExplicitType:
410 if (D->hasAttr<TypeVisibilityAttr>())
414 case LVForExplicitValue:
415 if (D->hasAttr<VisibilityAttr>())
418 case LVForLinkageOnly:
421 llvm_unreachable("bad visibility computation kind");
424 /// Should we consider visibility associated with the template
425 /// arguments and parameters of the given class template specialization?
426 static bool shouldConsiderTemplateVisibility(
427 const ClassTemplateSpecializationDecl *spec,
428 LVComputationKind computation) {
429 // Include visibility from the template parameters and arguments
430 // only if this is not an explicit instantiation or specialization
431 // with direct explicit visibility (and note that implicit
432 // instantiations won't have a direct attribute).
434 // Furthermore, we want to ignore template parameters and arguments
435 // for an explicit specialization when computing the visibility of a
436 // member thereof with explicit visibility.
438 // This is a bit complex; let's unpack it.
440 // An explicit class specialization is an independent, top-level
441 // declaration. As such, if it or any of its members has an
442 // explicit visibility attribute, that must directly express the
443 // user's intent, and we should honor it. The same logic applies to
444 // an explicit instantiation of a member of such a thing.
446 // Fast path: if this is not an explicit instantiation or
447 // specialization, we always want to consider template-related
448 // visibility restrictions.
449 if (!spec->isExplicitInstantiationOrSpecialization())
452 // This is the 'member thereof' check.
453 if (spec->isExplicitSpecialization() &&
454 hasExplicitVisibilityAlready(computation))
457 return !hasDirectVisibilityAttribute(spec, computation);
460 /// Merge in template-related linkage and visibility for the given
461 /// class template specialization.
462 static void mergeTemplateLV(LinkageInfo &LV,
463 const ClassTemplateSpecializationDecl *spec,
464 LVComputationKind computation) {
465 bool considerVisibility = shouldConsiderTemplateVisibility(spec, computation);
467 // Merge information from the template parameters, but ignore
468 // visibility if we're only considering template arguments.
470 ClassTemplateDecl *temp = spec->getSpecializedTemplate();
472 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
473 LV.mergeMaybeWithVisibility(tempLV,
474 considerVisibility && !hasExplicitVisibilityAlready(computation));
476 // Merge information from the template arguments. We ignore
477 // template-argument visibility if we've got an explicit
478 // instantiation with a visibility attribute.
479 const TemplateArgumentList &templateArgs = spec->getTemplateArgs();
480 LinkageInfo argsLV = getLVForTemplateArgumentList(templateArgs, computation);
481 if (considerVisibility)
482 LV.mergeVisibility(argsLV);
483 LV.mergeExternalVisibility(argsLV);
486 /// Should we consider visibility associated with the template
487 /// arguments and parameters of the given variable template
488 /// specialization? As usual, follow class template specialization
489 /// logic up to initialization.
490 static bool shouldConsiderTemplateVisibility(
491 const VarTemplateSpecializationDecl *spec,
492 LVComputationKind computation) {
493 // Include visibility from the template parameters and arguments
494 // only if this is not an explicit instantiation or specialization
495 // with direct explicit visibility (and note that implicit
496 // instantiations won't have a direct attribute).
497 if (!spec->isExplicitInstantiationOrSpecialization())
500 // An explicit variable specialization is an independent, top-level
501 // declaration. As such, if it has an explicit visibility attribute,
502 // that must directly express the user's intent, and we should honor
504 if (spec->isExplicitSpecialization() &&
505 hasExplicitVisibilityAlready(computation))
508 return !hasDirectVisibilityAttribute(spec, computation);
511 /// Merge in template-related linkage and visibility for the given
512 /// variable template specialization. As usual, follow class template
513 /// specialization logic up to initialization.
514 static void mergeTemplateLV(LinkageInfo &LV,
515 const VarTemplateSpecializationDecl *spec,
516 LVComputationKind computation) {
517 bool considerVisibility = shouldConsiderTemplateVisibility(spec, computation);
519 // Merge information from the template parameters, but ignore
520 // visibility if we're only considering template arguments.
522 VarTemplateDecl *temp = spec->getSpecializedTemplate();
524 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
525 LV.mergeMaybeWithVisibility(tempLV,
526 considerVisibility && !hasExplicitVisibilityAlready(computation));
528 // Merge information from the template arguments. We ignore
529 // template-argument visibility if we've got an explicit
530 // instantiation with a visibility attribute.
531 const TemplateArgumentList &templateArgs = spec->getTemplateArgs();
532 LinkageInfo argsLV = getLVForTemplateArgumentList(templateArgs, computation);
533 if (considerVisibility)
534 LV.mergeVisibility(argsLV);
535 LV.mergeExternalVisibility(argsLV);
538 static bool useInlineVisibilityHidden(const NamedDecl *D) {
539 // FIXME: we should warn if -fvisibility-inlines-hidden is used with c.
540 const LangOptions &Opts = D->getASTContext().getLangOpts();
541 if (!Opts.CPlusPlus || !Opts.InlineVisibilityHidden)
544 const auto *FD = dyn_cast<FunctionDecl>(D);
548 TemplateSpecializationKind TSK = TSK_Undeclared;
549 if (FunctionTemplateSpecializationInfo *spec
550 = FD->getTemplateSpecializationInfo()) {
551 TSK = spec->getTemplateSpecializationKind();
552 } else if (MemberSpecializationInfo *MSI =
553 FD->getMemberSpecializationInfo()) {
554 TSK = MSI->getTemplateSpecializationKind();
557 const FunctionDecl *Def = nullptr;
558 // InlineVisibilityHidden only applies to definitions, and
559 // isInlined() only gives meaningful answers on definitions
561 return TSK != TSK_ExplicitInstantiationDeclaration &&
562 TSK != TSK_ExplicitInstantiationDefinition &&
563 FD->hasBody(Def) && Def->isInlined() && !Def->hasAttr<GNUInlineAttr>();
566 template <typename T> static bool isFirstInExternCContext(T *D) {
567 const T *First = D->getFirstDecl();
568 return First->isInExternCContext();
571 static bool isSingleLineLanguageLinkage(const Decl &D) {
572 if (const auto *SD = dyn_cast<LinkageSpecDecl>(D.getDeclContext()))
573 if (!SD->hasBraces())
578 static LinkageInfo getLVForNamespaceScopeDecl(const NamedDecl *D,
579 LVComputationKind computation) {
580 assert(D->getDeclContext()->getRedeclContext()->isFileContext() &&
581 "Not a name having namespace scope");
582 ASTContext &Context = D->getASTContext();
584 // C++ [basic.link]p3:
585 // A name having namespace scope (3.3.6) has internal linkage if it
587 // - an object, reference, function or function template that is
588 // explicitly declared static; or,
589 // (This bullet corresponds to C99 6.2.2p3.)
590 if (const auto *Var = dyn_cast<VarDecl>(D)) {
591 // Explicitly declared static.
592 if (Var->getStorageClass() == SC_Static)
593 return LinkageInfo::internal();
595 // - a non-inline, non-volatile object or reference that is explicitly
596 // declared const or constexpr and neither explicitly declared extern
597 // nor previously declared to have external linkage; or (there is no
598 // equivalent in C99)
599 if (Context.getLangOpts().CPlusPlus &&
600 Var->getType().isConstQualified() &&
601 !Var->getType().isVolatileQualified() &&
603 const VarDecl *PrevVar = Var->getPreviousDecl();
605 return getLVForDecl(PrevVar, computation);
607 if (Var->getStorageClass() != SC_Extern &&
608 Var->getStorageClass() != SC_PrivateExtern &&
609 !isSingleLineLanguageLinkage(*Var))
610 return LinkageInfo::internal();
613 for (const VarDecl *PrevVar = Var->getPreviousDecl(); PrevVar;
614 PrevVar = PrevVar->getPreviousDecl()) {
615 if (PrevVar->getStorageClass() == SC_PrivateExtern &&
616 Var->getStorageClass() == SC_None)
617 return PrevVar->getLinkageAndVisibility();
618 // Explicitly declared static.
619 if (PrevVar->getStorageClass() == SC_Static)
620 return LinkageInfo::internal();
622 } else if (const FunctionDecl *Function = D->getAsFunction()) {
624 // A non-member function template can have internal linkage; any
625 // other template name shall have external linkage.
627 // Explicitly declared static.
628 if (Function->getCanonicalDecl()->getStorageClass() == SC_Static)
629 return LinkageInfo(InternalLinkage, DefaultVisibility, false);
630 } else if (const auto *IFD = dyn_cast<IndirectFieldDecl>(D)) {
631 // - a data member of an anonymous union.
632 const VarDecl *VD = IFD->getVarDecl();
633 assert(VD && "Expected a VarDecl in this IndirectFieldDecl!");
634 return getLVForNamespaceScopeDecl(VD, computation);
636 assert(!isa<FieldDecl>(D) && "Didn't expect a FieldDecl!");
638 if (D->isInAnonymousNamespace()) {
639 const auto *Var = dyn_cast<VarDecl>(D);
640 const auto *Func = dyn_cast<FunctionDecl>(D);
641 // FIXME: In C++11 onwards, anonymous namespaces should give decls
642 // within them internal linkage, not unique external linkage.
643 if ((!Var || !isFirstInExternCContext(Var)) &&
644 (!Func || !isFirstInExternCContext(Func)))
645 return LinkageInfo::uniqueExternal();
648 // Set up the defaults.
651 // If the declaration of an identifier for an object has file
652 // scope and no storage-class specifier, its linkage is
656 if (!hasExplicitVisibilityAlready(computation)) {
657 if (Optional<Visibility> Vis = getExplicitVisibility(D, computation)) {
658 LV.mergeVisibility(*Vis, true);
660 // If we're declared in a namespace with a visibility attribute,
661 // use that namespace's visibility, and it still counts as explicit.
662 for (const DeclContext *DC = D->getDeclContext();
663 !isa<TranslationUnitDecl>(DC);
664 DC = DC->getParent()) {
665 const auto *ND = dyn_cast<NamespaceDecl>(DC);
667 if (Optional<Visibility> Vis = getExplicitVisibility(ND, computation)) {
668 LV.mergeVisibility(*Vis, true);
674 // Add in global settings if the above didn't give us direct visibility.
675 if (!LV.isVisibilityExplicit()) {
676 // Use global type/value visibility as appropriate.
677 Visibility globalVisibility;
678 if (computation == LVForValue) {
679 globalVisibility = Context.getLangOpts().getValueVisibilityMode();
681 assert(computation == LVForType);
682 globalVisibility = Context.getLangOpts().getTypeVisibilityMode();
684 LV.mergeVisibility(globalVisibility, /*explicit*/ false);
686 // If we're paying attention to global visibility, apply
687 // -finline-visibility-hidden if this is an inline method.
688 if (useInlineVisibilityHidden(D))
689 LV.mergeVisibility(HiddenVisibility, true);
693 // C++ [basic.link]p4:
695 // A name having namespace scope has external linkage if it is the
698 // - an object or reference, unless it has internal linkage; or
699 if (const auto *Var = dyn_cast<VarDecl>(D)) {
700 // GCC applies the following optimization to variables and static
701 // data members, but not to functions:
703 // Modify the variable's LV by the LV of its type unless this is
704 // C or extern "C". This follows from [basic.link]p9:
705 // A type without linkage shall not be used as the type of a
706 // variable or function with external linkage unless
707 // - the entity has C language linkage, or
708 // - the entity is declared within an unnamed namespace, or
709 // - the entity is not used or is defined in the same
711 // and [basic.link]p10:
712 // ...the types specified by all declarations referring to a
713 // given variable or function shall be identical...
714 // C does not have an equivalent rule.
716 // Ignore this if we've got an explicit attribute; the user
717 // probably knows what they're doing.
719 // Note that we don't want to make the variable non-external
720 // because of this, but unique-external linkage suits us.
721 if (Context.getLangOpts().CPlusPlus && !isFirstInExternCContext(Var)) {
722 LinkageInfo TypeLV = getLVForType(*Var->getType(), computation);
723 if (TypeLV.getLinkage() != ExternalLinkage)
724 return LinkageInfo::uniqueExternal();
725 if (!LV.isVisibilityExplicit())
726 LV.mergeVisibility(TypeLV);
729 if (Var->getStorageClass() == SC_PrivateExtern)
730 LV.mergeVisibility(HiddenVisibility, true);
732 // Note that Sema::MergeVarDecl already takes care of implementing
733 // C99 6.2.2p4 and propagating the visibility attribute, so we don't have
736 // As per function and class template specializations (below),
737 // consider LV for the template and template arguments. We're at file
738 // scope, so we do not need to worry about nested specializations.
739 if (const auto *spec = dyn_cast<VarTemplateSpecializationDecl>(Var)) {
740 mergeTemplateLV(LV, spec, computation);
743 // - a function, unless it has internal linkage; or
744 } else if (const auto *Function = dyn_cast<FunctionDecl>(D)) {
745 // In theory, we can modify the function's LV by the LV of its
746 // type unless it has C linkage (see comment above about variables
747 // for justification). In practice, GCC doesn't do this, so it's
748 // just too painful to make work.
750 if (Function->getStorageClass() == SC_PrivateExtern)
751 LV.mergeVisibility(HiddenVisibility, true);
753 // Note that Sema::MergeCompatibleFunctionDecls already takes care of
754 // merging storage classes and visibility attributes, so we don't have to
755 // look at previous decls in here.
757 // In C++, then if the type of the function uses a type with
758 // unique-external linkage, it's not legally usable from outside
759 // this translation unit. However, we should use the C linkage
760 // rules instead for extern "C" declarations.
761 if (Context.getLangOpts().CPlusPlus &&
762 !Function->isInExternCContext()) {
763 // Only look at the type-as-written. If this function has an auto-deduced
764 // return type, we can't compute the linkage of that type because it could
765 // require looking at the linkage of this function, and we don't need this
766 // for correctness because the type is not part of the function's
768 // FIXME: This is a hack. We should be able to solve this circularity and
769 // the one in getLVForClassMember for Functions some other way.
770 QualType TypeAsWritten = Function->getType();
771 if (TypeSourceInfo *TSI = Function->getTypeSourceInfo())
772 TypeAsWritten = TSI->getType();
773 if (TypeAsWritten->getLinkage() == UniqueExternalLinkage)
774 return LinkageInfo::uniqueExternal();
777 // Consider LV from the template and the template arguments.
778 // We're at file scope, so we do not need to worry about nested
780 if (FunctionTemplateSpecializationInfo *specInfo
781 = Function->getTemplateSpecializationInfo()) {
782 mergeTemplateLV(LV, Function, specInfo, computation);
785 // - a named class (Clause 9), or an unnamed class defined in a
786 // typedef declaration in which the class has the typedef name
787 // for linkage purposes (7.1.3); or
788 // - a named enumeration (7.2), or an unnamed enumeration
789 // defined in a typedef declaration in which the enumeration
790 // has the typedef name for linkage purposes (7.1.3); or
791 } else if (const auto *Tag = dyn_cast<TagDecl>(D)) {
792 // Unnamed tags have no linkage.
793 if (!Tag->hasNameForLinkage())
794 return LinkageInfo::none();
796 // If this is a class template specialization, consider the
797 // linkage of the template and template arguments. We're at file
798 // scope, so we do not need to worry about nested specializations.
799 if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(Tag)) {
800 mergeTemplateLV(LV, spec, computation);
803 // - an enumerator belonging to an enumeration with external linkage;
804 } else if (isa<EnumConstantDecl>(D)) {
805 LinkageInfo EnumLV = getLVForDecl(cast<NamedDecl>(D->getDeclContext()),
807 if (!isExternalFormalLinkage(EnumLV.getLinkage()))
808 return LinkageInfo::none();
811 // - a template, unless it is a function template that has
812 // internal linkage (Clause 14);
813 } else if (const auto *temp = dyn_cast<TemplateDecl>(D)) {
814 bool considerVisibility = !hasExplicitVisibilityAlready(computation);
816 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
817 LV.mergeMaybeWithVisibility(tempLV, considerVisibility);
819 // - a namespace (7.3), unless it is declared within an unnamed
821 } else if (isa<NamespaceDecl>(D) && !D->isInAnonymousNamespace()) {
824 // By extension, we assign external linkage to Objective-C
826 } else if (isa<ObjCInterfaceDecl>(D)) {
829 } else if (auto *TD = dyn_cast<TypedefNameDecl>(D)) {
830 // A typedef declaration has linkage if it gives a type a name for
832 if (!TD->getAnonDeclWithTypedefName(/*AnyRedecl*/true))
833 return LinkageInfo::none();
835 // Everything not covered here has no linkage.
837 return LinkageInfo::none();
840 // If we ended up with non-external linkage, visibility should
841 // always be default.
842 if (LV.getLinkage() != ExternalLinkage)
843 return LinkageInfo(LV.getLinkage(), DefaultVisibility, false);
848 static LinkageInfo getLVForClassMember(const NamedDecl *D,
849 LVComputationKind computation) {
850 // Only certain class members have linkage. Note that fields don't
851 // really have linkage, but it's convenient to say they do for the
852 // purposes of calculating linkage of pointer-to-data-member
853 // template arguments.
855 // Templates also don't officially have linkage, but since we ignore
856 // the C++ standard and look at template arguments when determining
857 // linkage and visibility of a template specialization, we might hit
858 // a template template argument that way. If we do, we need to
859 // consider its linkage.
860 if (!(isa<CXXMethodDecl>(D) ||
863 isa<IndirectFieldDecl>(D) ||
865 isa<TemplateDecl>(D)))
866 return LinkageInfo::none();
870 // If we have an explicit visibility attribute, merge that in.
871 if (!hasExplicitVisibilityAlready(computation)) {
872 if (Optional<Visibility> Vis = getExplicitVisibility(D, computation))
873 LV.mergeVisibility(*Vis, true);
874 // If we're paying attention to global visibility, apply
875 // -finline-visibility-hidden if this is an inline method.
877 // Note that we do this before merging information about
878 // the class visibility.
879 if (!LV.isVisibilityExplicit() && useInlineVisibilityHidden(D))
880 LV.mergeVisibility(HiddenVisibility, true);
883 // If this class member has an explicit visibility attribute, the only
884 // thing that can change its visibility is the template arguments, so
885 // only look for them when processing the class.
886 LVComputationKind classComputation = computation;
887 if (LV.isVisibilityExplicit())
888 classComputation = withExplicitVisibilityAlready(computation);
890 LinkageInfo classLV =
891 getLVForDecl(cast<RecordDecl>(D->getDeclContext()), classComputation);
892 // If the class already has unique-external linkage, we can't improve.
893 if (classLV.getLinkage() == UniqueExternalLinkage)
894 return LinkageInfo::uniqueExternal();
896 if (!isExternallyVisible(classLV.getLinkage()))
897 return LinkageInfo::none();
900 // Otherwise, don't merge in classLV yet, because in certain cases
901 // we need to completely ignore the visibility from it.
903 // Specifically, if this decl exists and has an explicit attribute.
904 const NamedDecl *explicitSpecSuppressor = nullptr;
906 if (const auto *MD = dyn_cast<CXXMethodDecl>(D)) {
907 // If the type of the function uses a type with unique-external
908 // linkage, it's not legally usable from outside this translation unit.
909 // But only look at the type-as-written. If this function has an
910 // auto-deduced return type, we can't compute the linkage of that type
911 // because it could require looking at the linkage of this function, and we
912 // don't need this for correctness because the type is not part of the
913 // function's signature.
914 // FIXME: This is a hack. We should be able to solve this circularity and
915 // the one in getLVForNamespaceScopeDecl for Functions some other way.
917 QualType TypeAsWritten = MD->getType();
918 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo())
919 TypeAsWritten = TSI->getType();
920 if (TypeAsWritten->getLinkage() == UniqueExternalLinkage)
921 return LinkageInfo::uniqueExternal();
923 // If this is a method template specialization, use the linkage for
924 // the template parameters and arguments.
925 if (FunctionTemplateSpecializationInfo *spec
926 = MD->getTemplateSpecializationInfo()) {
927 mergeTemplateLV(LV, MD, spec, computation);
928 if (spec->isExplicitSpecialization()) {
929 explicitSpecSuppressor = MD;
930 } else if (isExplicitMemberSpecialization(spec->getTemplate())) {
931 explicitSpecSuppressor = spec->getTemplate()->getTemplatedDecl();
933 } else if (isExplicitMemberSpecialization(MD)) {
934 explicitSpecSuppressor = MD;
937 } else if (const auto *RD = dyn_cast<CXXRecordDecl>(D)) {
938 if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(RD)) {
939 mergeTemplateLV(LV, spec, computation);
940 if (spec->isExplicitSpecialization()) {
941 explicitSpecSuppressor = spec;
943 const ClassTemplateDecl *temp = spec->getSpecializedTemplate();
944 if (isExplicitMemberSpecialization(temp)) {
945 explicitSpecSuppressor = temp->getTemplatedDecl();
948 } else if (isExplicitMemberSpecialization(RD)) {
949 explicitSpecSuppressor = RD;
952 // Static data members.
953 } else if (const auto *VD = dyn_cast<VarDecl>(D)) {
954 if (const auto *spec = dyn_cast<VarTemplateSpecializationDecl>(VD))
955 mergeTemplateLV(LV, spec, computation);
957 // Modify the variable's linkage by its type, but ignore the
958 // type's visibility unless it's a definition.
959 LinkageInfo typeLV = getLVForType(*VD->getType(), computation);
960 if (!LV.isVisibilityExplicit() && !classLV.isVisibilityExplicit())
961 LV.mergeVisibility(typeLV);
962 LV.mergeExternalVisibility(typeLV);
964 if (isExplicitMemberSpecialization(VD)) {
965 explicitSpecSuppressor = VD;
969 } else if (const auto *temp = dyn_cast<TemplateDecl>(D)) {
970 bool considerVisibility =
971 (!LV.isVisibilityExplicit() &&
972 !classLV.isVisibilityExplicit() &&
973 !hasExplicitVisibilityAlready(computation));
975 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
976 LV.mergeMaybeWithVisibility(tempLV, considerVisibility);
978 if (const auto *redeclTemp = dyn_cast<RedeclarableTemplateDecl>(temp)) {
979 if (isExplicitMemberSpecialization(redeclTemp)) {
980 explicitSpecSuppressor = temp->getTemplatedDecl();
985 // We should never be looking for an attribute directly on a template.
986 assert(!explicitSpecSuppressor || !isa<TemplateDecl>(explicitSpecSuppressor));
988 // If this member is an explicit member specialization, and it has
989 // an explicit attribute, ignore visibility from the parent.
990 bool considerClassVisibility = true;
991 if (explicitSpecSuppressor &&
992 // optimization: hasDVA() is true only with explicit visibility.
993 LV.isVisibilityExplicit() &&
994 classLV.getVisibility() != DefaultVisibility &&
995 hasDirectVisibilityAttribute(explicitSpecSuppressor, computation)) {
996 considerClassVisibility = false;
999 // Finally, merge in information from the class.
1000 LV.mergeMaybeWithVisibility(classLV, considerClassVisibility);
1004 void NamedDecl::anchor() { }
1006 static LinkageInfo computeLVForDecl(const NamedDecl *D,
1007 LVComputationKind computation);
1009 bool NamedDecl::isLinkageValid() const {
1010 if (!hasCachedLinkage())
1013 return computeLVForDecl(this, LVForLinkageOnly).getLinkage() ==
1017 ObjCStringFormatFamily NamedDecl::getObjCFStringFormattingFamily() const {
1018 StringRef name = getName();
1019 if (name.empty()) return SFF_None;
1021 if (name.front() == 'C')
1022 if (name == "CFStringCreateWithFormat" ||
1023 name == "CFStringCreateWithFormatAndArguments" ||
1024 name == "CFStringAppendFormat" ||
1025 name == "CFStringAppendFormatAndArguments")
1026 return SFF_CFString;
1030 Linkage NamedDecl::getLinkageInternal() const {
1031 // We don't care about visibility here, so ask for the cheapest
1032 // possible visibility analysis.
1033 return getLVForDecl(this, LVForLinkageOnly).getLinkage();
1036 LinkageInfo NamedDecl::getLinkageAndVisibility() const {
1037 LVComputationKind computation =
1038 (usesTypeVisibility(this) ? LVForType : LVForValue);
1039 return getLVForDecl(this, computation);
1042 static Optional<Visibility>
1043 getExplicitVisibilityAux(const NamedDecl *ND,
1044 NamedDecl::ExplicitVisibilityKind kind,
1045 bool IsMostRecent) {
1046 assert(!IsMostRecent || ND == ND->getMostRecentDecl());
1048 // Check the declaration itself first.
1049 if (Optional<Visibility> V = getVisibilityOf(ND, kind))
1052 // If this is a member class of a specialization of a class template
1053 // and the corresponding decl has explicit visibility, use that.
1054 if (const auto *RD = dyn_cast<CXXRecordDecl>(ND)) {
1055 CXXRecordDecl *InstantiatedFrom = RD->getInstantiatedFromMemberClass();
1056 if (InstantiatedFrom)
1057 return getVisibilityOf(InstantiatedFrom, kind);
1060 // If there wasn't explicit visibility there, and this is a
1061 // specialization of a class template, check for visibility
1063 if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(ND))
1064 return getVisibilityOf(spec->getSpecializedTemplate()->getTemplatedDecl(),
1067 // Use the most recent declaration.
1068 if (!IsMostRecent && !isa<NamespaceDecl>(ND)) {
1069 const NamedDecl *MostRecent = ND->getMostRecentDecl();
1070 if (MostRecent != ND)
1071 return getExplicitVisibilityAux(MostRecent, kind, true);
1074 if (const auto *Var = dyn_cast<VarDecl>(ND)) {
1075 if (Var->isStaticDataMember()) {
1076 VarDecl *InstantiatedFrom = Var->getInstantiatedFromStaticDataMember();
1077 if (InstantiatedFrom)
1078 return getVisibilityOf(InstantiatedFrom, kind);
1081 if (const auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(Var))
1082 return getVisibilityOf(VTSD->getSpecializedTemplate()->getTemplatedDecl(),
1087 // Also handle function template specializations.
1088 if (const auto *fn = dyn_cast<FunctionDecl>(ND)) {
1089 // If the function is a specialization of a template with an
1090 // explicit visibility attribute, use that.
1091 if (FunctionTemplateSpecializationInfo *templateInfo
1092 = fn->getTemplateSpecializationInfo())
1093 return getVisibilityOf(templateInfo->getTemplate()->getTemplatedDecl(),
1096 // If the function is a member of a specialization of a class template
1097 // and the corresponding decl has explicit visibility, use that.
1098 FunctionDecl *InstantiatedFrom = fn->getInstantiatedFromMemberFunction();
1099 if (InstantiatedFrom)
1100 return getVisibilityOf(InstantiatedFrom, kind);
1105 // The visibility of a template is stored in the templated decl.
1106 if (const auto *TD = dyn_cast<TemplateDecl>(ND))
1107 return getVisibilityOf(TD->getTemplatedDecl(), kind);
1112 Optional<Visibility>
1113 NamedDecl::getExplicitVisibility(ExplicitVisibilityKind kind) const {
1114 return getExplicitVisibilityAux(this, kind, false);
1117 static LinkageInfo getLVForClosure(const DeclContext *DC, Decl *ContextDecl,
1118 LVComputationKind computation) {
1119 // This lambda has its linkage/visibility determined by its owner.
1121 if (isa<ParmVarDecl>(ContextDecl))
1122 DC = ContextDecl->getDeclContext()->getRedeclContext();
1124 return getLVForDecl(cast<NamedDecl>(ContextDecl), computation);
1127 if (const auto *ND = dyn_cast<NamedDecl>(DC))
1128 return getLVForDecl(ND, computation);
1130 return LinkageInfo::external();
1133 static LinkageInfo getLVForLocalDecl(const NamedDecl *D,
1134 LVComputationKind computation) {
1135 if (const auto *Function = dyn_cast<FunctionDecl>(D)) {
1136 if (Function->isInAnonymousNamespace() &&
1137 !Function->isInExternCContext())
1138 return LinkageInfo::uniqueExternal();
1140 // This is a "void f();" which got merged with a file static.
1141 if (Function->getCanonicalDecl()->getStorageClass() == SC_Static)
1142 return LinkageInfo::internal();
1145 if (!hasExplicitVisibilityAlready(computation)) {
1146 if (Optional<Visibility> Vis =
1147 getExplicitVisibility(Function, computation))
1148 LV.mergeVisibility(*Vis, true);
1151 // Note that Sema::MergeCompatibleFunctionDecls already takes care of
1152 // merging storage classes and visibility attributes, so we don't have to
1153 // look at previous decls in here.
1158 if (const auto *Var = dyn_cast<VarDecl>(D)) {
1159 if (Var->hasExternalStorage()) {
1160 if (Var->isInAnonymousNamespace() && !Var->isInExternCContext())
1161 return LinkageInfo::uniqueExternal();
1164 if (Var->getStorageClass() == SC_PrivateExtern)
1165 LV.mergeVisibility(HiddenVisibility, true);
1166 else if (!hasExplicitVisibilityAlready(computation)) {
1167 if (Optional<Visibility> Vis = getExplicitVisibility(Var, computation))
1168 LV.mergeVisibility(*Vis, true);
1171 if (const VarDecl *Prev = Var->getPreviousDecl()) {
1172 LinkageInfo PrevLV = getLVForDecl(Prev, computation);
1173 if (PrevLV.getLinkage())
1174 LV.setLinkage(PrevLV.getLinkage());
1175 LV.mergeVisibility(PrevLV);
1181 if (!Var->isStaticLocal())
1182 return LinkageInfo::none();
1185 ASTContext &Context = D->getASTContext();
1186 if (!Context.getLangOpts().CPlusPlus)
1187 return LinkageInfo::none();
1189 const Decl *OuterD = getOutermostFuncOrBlockContext(D);
1190 if (!OuterD || OuterD->isInvalidDecl())
1191 return LinkageInfo::none();
1194 if (const auto *BD = dyn_cast<BlockDecl>(OuterD)) {
1195 if (!BD->getBlockManglingNumber())
1196 return LinkageInfo::none();
1198 LV = getLVForClosure(BD->getDeclContext()->getRedeclContext(),
1199 BD->getBlockManglingContextDecl(), computation);
1201 const auto *FD = cast<FunctionDecl>(OuterD);
1202 if (!FD->isInlined() &&
1203 !isTemplateInstantiation(FD->getTemplateSpecializationKind()))
1204 return LinkageInfo::none();
1206 LV = getLVForDecl(FD, computation);
1208 if (!isExternallyVisible(LV.getLinkage()))
1209 return LinkageInfo::none();
1210 return LinkageInfo(VisibleNoLinkage, LV.getVisibility(),
1211 LV.isVisibilityExplicit());
1214 static inline const CXXRecordDecl*
1215 getOutermostEnclosingLambda(const CXXRecordDecl *Record) {
1216 const CXXRecordDecl *Ret = Record;
1217 while (Record && Record->isLambda()) {
1219 if (!Record->getParent()) break;
1220 // Get the Containing Class of this Lambda Class
1221 Record = dyn_cast_or_null<CXXRecordDecl>(
1222 Record->getParent()->getParent());
1227 static LinkageInfo computeLVForDecl(const NamedDecl *D,
1228 LVComputationKind computation) {
1229 // Internal_linkage attribute overrides other considerations.
1230 if (D->hasAttr<InternalLinkageAttr>())
1231 return LinkageInfo::internal();
1233 // Objective-C: treat all Objective-C declarations as having external
1235 switch (D->getKind()) {
1239 // Per C++ [basic.link]p2, only the names of objects, references,
1240 // functions, types, templates, namespaces, and values ever have linkage.
1242 // Note that the name of a typedef, namespace alias, using declaration,
1243 // and so on are not the name of the corresponding type, namespace, or
1244 // declaration, so they do *not* have linkage.
1245 case Decl::ImplicitParam:
1247 case Decl::NamespaceAlias:
1250 case Decl::UsingShadow:
1251 case Decl::UsingDirective:
1252 return LinkageInfo::none();
1254 case Decl::EnumConstant:
1255 // C++ [basic.link]p4: an enumerator has the linkage of its enumeration.
1256 return getLVForDecl(cast<EnumDecl>(D->getDeclContext()), computation);
1259 case Decl::TypeAlias:
1260 // A typedef declaration has linkage if it gives a type a name for
1261 // linkage purposes.
1262 if (!D->getASTContext().getLangOpts().CPlusPlus ||
1263 !cast<TypedefNameDecl>(D)
1264 ->getAnonDeclWithTypedefName(/*AnyRedecl*/true))
1265 return LinkageInfo::none();
1268 case Decl::TemplateTemplateParm: // count these as external
1269 case Decl::NonTypeTemplateParm:
1270 case Decl::ObjCAtDefsField:
1271 case Decl::ObjCCategory:
1272 case Decl::ObjCCategoryImpl:
1273 case Decl::ObjCCompatibleAlias:
1274 case Decl::ObjCImplementation:
1275 case Decl::ObjCMethod:
1276 case Decl::ObjCProperty:
1277 case Decl::ObjCPropertyImpl:
1278 case Decl::ObjCProtocol:
1279 return LinkageInfo::external();
1281 case Decl::CXXRecord: {
1282 const auto *Record = cast<CXXRecordDecl>(D);
1283 if (Record->isLambda()) {
1284 if (!Record->getLambdaManglingNumber()) {
1285 // This lambda has no mangling number, so it's internal.
1286 return LinkageInfo::internal();
1289 // This lambda has its linkage/visibility determined:
1290 // - either by the outermost lambda if that lambda has no mangling
1292 // - or by the parent of the outer most lambda
1293 // This prevents infinite recursion in settings such as nested lambdas
1294 // used in NSDMI's, for e.g.
1297 // int t2 = ([](int a) { return [](int b) { return b; };})(t)(t);
1299 const CXXRecordDecl *OuterMostLambda =
1300 getOutermostEnclosingLambda(Record);
1301 if (!OuterMostLambda->getLambdaManglingNumber())
1302 return LinkageInfo::internal();
1304 return getLVForClosure(
1305 OuterMostLambda->getDeclContext()->getRedeclContext(),
1306 OuterMostLambda->getLambdaContextDecl(), computation);
1313 // Handle linkage for namespace-scope names.
1314 if (D->getDeclContext()->getRedeclContext()->isFileContext())
1315 return getLVForNamespaceScopeDecl(D, computation);
1317 // C++ [basic.link]p5:
1318 // In addition, a member function, static data member, a named
1319 // class or enumeration of class scope, or an unnamed class or
1320 // enumeration defined in a class-scope typedef declaration such
1321 // that the class or enumeration has the typedef name for linkage
1322 // purposes (7.1.3), has external linkage if the name of the class
1323 // has external linkage.
1324 if (D->getDeclContext()->isRecord())
1325 return getLVForClassMember(D, computation);
1327 // C++ [basic.link]p6:
1328 // The name of a function declared in block scope and the name of
1329 // an object declared by a block scope extern declaration have
1330 // linkage. If there is a visible declaration of an entity with
1331 // linkage having the same name and type, ignoring entities
1332 // declared outside the innermost enclosing namespace scope, the
1333 // block scope declaration declares that same entity and receives
1334 // the linkage of the previous declaration. If there is more than
1335 // one such matching entity, the program is ill-formed. Otherwise,
1336 // if no matching entity is found, the block scope entity receives
1337 // external linkage.
1338 if (D->getDeclContext()->isFunctionOrMethod())
1339 return getLVForLocalDecl(D, computation);
1341 // C++ [basic.link]p6:
1342 // Names not covered by these rules have no linkage.
1343 return LinkageInfo::none();
1347 class LinkageComputer {
1349 static LinkageInfo getLVForDecl(const NamedDecl *D,
1350 LVComputationKind computation) {
1351 // Internal_linkage attribute overrides other considerations.
1352 if (D->hasAttr<InternalLinkageAttr>())
1353 return LinkageInfo::internal();
1355 if (computation == LVForLinkageOnly && D->hasCachedLinkage())
1356 return LinkageInfo(D->getCachedLinkage(), DefaultVisibility, false);
1358 LinkageInfo LV = computeLVForDecl(D, computation);
1359 if (D->hasCachedLinkage())
1360 assert(D->getCachedLinkage() == LV.getLinkage());
1362 D->setCachedLinkage(LV.getLinkage());
1365 // In C (because of gnu inline) and in c++ with microsoft extensions an
1366 // static can follow an extern, so we can have two decls with different
1368 const LangOptions &Opts = D->getASTContext().getLangOpts();
1369 if (!Opts.CPlusPlus || Opts.MicrosoftExt)
1372 // We have just computed the linkage for this decl. By induction we know
1373 // that all other computed linkages match, check that the one we just
1374 // computed also does.
1375 NamedDecl *Old = nullptr;
1376 for (auto I : D->redecls()) {
1377 auto *T = cast<NamedDecl>(I);
1380 if (!T->isInvalidDecl() && T->hasCachedLinkage()) {
1385 assert(!Old || Old->getCachedLinkage() == D->getCachedLinkage());
1393 static LinkageInfo getLVForDecl(const NamedDecl *D,
1394 LVComputationKind computation) {
1395 return clang::LinkageComputer::getLVForDecl(D, computation);
1398 void NamedDecl::printName(raw_ostream &os) const {
1402 std::string NamedDecl::getQualifiedNameAsString() const {
1403 std::string QualName;
1404 llvm::raw_string_ostream OS(QualName);
1405 printQualifiedName(OS, getASTContext().getPrintingPolicy());
1409 void NamedDecl::printQualifiedName(raw_ostream &OS) const {
1410 printQualifiedName(OS, getASTContext().getPrintingPolicy());
1413 void NamedDecl::printQualifiedName(raw_ostream &OS,
1414 const PrintingPolicy &P) const {
1415 const DeclContext *Ctx = getDeclContext();
1417 if (Ctx->isFunctionOrMethod()) {
1422 typedef SmallVector<const DeclContext *, 8> ContextsTy;
1423 ContextsTy Contexts;
1425 // Collect contexts.
1426 while (Ctx && isa<NamedDecl>(Ctx)) {
1427 Contexts.push_back(Ctx);
1428 Ctx = Ctx->getParent();
1431 for (const DeclContext *DC : reverse(Contexts)) {
1432 if (const auto *Spec = dyn_cast<ClassTemplateSpecializationDecl>(DC)) {
1433 OS << Spec->getName();
1434 const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs();
1435 TemplateSpecializationType::PrintTemplateArgumentList(
1436 OS, TemplateArgs.asArray(), P);
1437 } else if (const auto *ND = dyn_cast<NamespaceDecl>(DC)) {
1438 if (P.SuppressUnwrittenScope &&
1439 (ND->isAnonymousNamespace() || ND->isInline()))
1441 if (ND->isAnonymousNamespace()) {
1442 OS << (P.MSVCFormatting ? "`anonymous namespace\'"
1443 : "(anonymous namespace)");
1447 } else if (const auto *RD = dyn_cast<RecordDecl>(DC)) {
1448 if (!RD->getIdentifier())
1449 OS << "(anonymous " << RD->getKindName() << ')';
1452 } else if (const auto *FD = dyn_cast<FunctionDecl>(DC)) {
1453 const FunctionProtoType *FT = nullptr;
1454 if (FD->hasWrittenPrototype())
1455 FT = dyn_cast<FunctionProtoType>(FD->getType()->castAs<FunctionType>());
1459 unsigned NumParams = FD->getNumParams();
1460 for (unsigned i = 0; i < NumParams; ++i) {
1463 OS << FD->getParamDecl(i)->getType().stream(P);
1466 if (FT->isVariadic()) {
1473 } else if (const auto *ED = dyn_cast<EnumDecl>(DC)) {
1474 // C++ [dcl.enum]p10: Each enum-name and each unscoped
1475 // enumerator is declared in the scope that immediately contains
1476 // the enum-specifier. Each scoped enumerator is declared in the
1477 // scope of the enumeration.
1478 if (ED->isScoped() || ED->getIdentifier())
1483 OS << *cast<NamedDecl>(DC);
1488 if (getDeclName() || isa<DecompositionDecl>(this))
1491 OS << "(anonymous)";
1494 void NamedDecl::getNameForDiagnostic(raw_ostream &OS,
1495 const PrintingPolicy &Policy,
1496 bool Qualified) const {
1498 printQualifiedName(OS, Policy);
1503 template<typename T> static bool isRedeclarableImpl(Redeclarable<T> *) {
1506 static bool isRedeclarableImpl(...) { return false; }
1507 static bool isRedeclarable(Decl::Kind K) {
1509 #define DECL(Type, Base) \
1511 return isRedeclarableImpl((Type##Decl *)nullptr);
1512 #define ABSTRACT_DECL(DECL)
1513 #include "clang/AST/DeclNodes.inc"
1515 llvm_unreachable("unknown decl kind");
1518 bool NamedDecl::declarationReplaces(NamedDecl *OldD, bool IsKnownNewer) const {
1519 assert(getDeclName() == OldD->getDeclName() && "Declaration name mismatch");
1521 // Never replace one imported declaration with another; we need both results
1522 // when re-exporting.
1523 if (OldD->isFromASTFile() && isFromASTFile())
1526 // A kind mismatch implies that the declaration is not replaced.
1527 if (OldD->getKind() != getKind())
1530 // For method declarations, we never replace. (Why?)
1531 if (isa<ObjCMethodDecl>(this))
1534 // For parameters, pick the newer one. This is either an error or (in
1535 // Objective-C) permitted as an extension.
1536 if (isa<ParmVarDecl>(this))
1539 // Inline namespaces can give us two declarations with the same
1540 // name and kind in the same scope but different contexts; we should
1541 // keep both declarations in this case.
1542 if (!this->getDeclContext()->getRedeclContext()->Equals(
1543 OldD->getDeclContext()->getRedeclContext()))
1546 // Using declarations can be replaced if they import the same name from the
1548 if (auto *UD = dyn_cast<UsingDecl>(this)) {
1549 ASTContext &Context = getASTContext();
1550 return Context.getCanonicalNestedNameSpecifier(UD->getQualifier()) ==
1551 Context.getCanonicalNestedNameSpecifier(
1552 cast<UsingDecl>(OldD)->getQualifier());
1554 if (auto *UUVD = dyn_cast<UnresolvedUsingValueDecl>(this)) {
1555 ASTContext &Context = getASTContext();
1556 return Context.getCanonicalNestedNameSpecifier(UUVD->getQualifier()) ==
1557 Context.getCanonicalNestedNameSpecifier(
1558 cast<UnresolvedUsingValueDecl>(OldD)->getQualifier());
1561 // UsingDirectiveDecl's are not really NamedDecl's, and all have same name.
1562 // They can be replaced if they nominate the same namespace.
1563 // FIXME: Is this true even if they have different module visibility?
1564 if (auto *UD = dyn_cast<UsingDirectiveDecl>(this))
1565 return UD->getNominatedNamespace()->getOriginalNamespace() ==
1566 cast<UsingDirectiveDecl>(OldD)->getNominatedNamespace()
1567 ->getOriginalNamespace();
1569 if (isRedeclarable(getKind())) {
1570 if (getCanonicalDecl() != OldD->getCanonicalDecl())
1576 // Check whether this is actually newer than OldD. We want to keep the
1577 // newer declaration. This loop will usually only iterate once, because
1578 // OldD is usually the previous declaration.
1579 for (auto D : redecls()) {
1583 // If we reach the canonical declaration, then OldD is not actually older
1586 // FIXME: In this case, we should not add this decl to the lookup table.
1587 if (D->isCanonicalDecl())
1591 // It's a newer declaration of the same kind of declaration in the same
1592 // scope: we want this decl instead of the existing one.
1596 // In all other cases, we need to keep both declarations in case they have
1597 // different visibility. Any attempt to use the name will result in an
1598 // ambiguity if more than one is visible.
1602 bool NamedDecl::hasLinkage() const {
1603 return getFormalLinkage() != NoLinkage;
1606 NamedDecl *NamedDecl::getUnderlyingDeclImpl() {
1607 NamedDecl *ND = this;
1608 while (auto *UD = dyn_cast<UsingShadowDecl>(ND))
1609 ND = UD->getTargetDecl();
1611 if (auto *AD = dyn_cast<ObjCCompatibleAliasDecl>(ND))
1612 return AD->getClassInterface();
1614 if (auto *AD = dyn_cast<NamespaceAliasDecl>(ND))
1615 return AD->getNamespace();
1620 bool NamedDecl::isCXXInstanceMember() const {
1621 if (!isCXXClassMember())
1624 const NamedDecl *D = this;
1625 if (isa<UsingShadowDecl>(D))
1626 D = cast<UsingShadowDecl>(D)->getTargetDecl();
1628 if (isa<FieldDecl>(D) || isa<IndirectFieldDecl>(D) || isa<MSPropertyDecl>(D))
1630 if (const auto *MD = dyn_cast_or_null<CXXMethodDecl>(D->getAsFunction()))
1631 return MD->isInstance();
1635 //===----------------------------------------------------------------------===//
1636 // DeclaratorDecl Implementation
1637 //===----------------------------------------------------------------------===//
1639 template <typename DeclT>
1640 static SourceLocation getTemplateOrInnerLocStart(const DeclT *decl) {
1641 if (decl->getNumTemplateParameterLists() > 0)
1642 return decl->getTemplateParameterList(0)->getTemplateLoc();
1644 return decl->getInnerLocStart();
1647 SourceLocation DeclaratorDecl::getTypeSpecStartLoc() const {
1648 TypeSourceInfo *TSI = getTypeSourceInfo();
1649 if (TSI) return TSI->getTypeLoc().getBeginLoc();
1650 return SourceLocation();
1653 void DeclaratorDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) {
1655 // Make sure the extended decl info is allocated.
1656 if (!hasExtInfo()) {
1657 // Save (non-extended) type source info pointer.
1658 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
1659 // Allocate external info struct.
1660 DeclInfo = new (getASTContext()) ExtInfo;
1661 // Restore savedTInfo into (extended) decl info.
1662 getExtInfo()->TInfo = savedTInfo;
1664 // Set qualifier info.
1665 getExtInfo()->QualifierLoc = QualifierLoc;
1667 // Here Qualifier == 0, i.e., we are removing the qualifier (if any).
1669 if (getExtInfo()->NumTemplParamLists == 0) {
1670 // Save type source info pointer.
1671 TypeSourceInfo *savedTInfo = getExtInfo()->TInfo;
1672 // Deallocate the extended decl info.
1673 getASTContext().Deallocate(getExtInfo());
1674 // Restore savedTInfo into (non-extended) decl info.
1675 DeclInfo = savedTInfo;
1678 getExtInfo()->QualifierLoc = QualifierLoc;
1683 void DeclaratorDecl::setTemplateParameterListsInfo(
1684 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
1685 assert(!TPLists.empty());
1686 // Make sure the extended decl info is allocated.
1687 if (!hasExtInfo()) {
1688 // Save (non-extended) type source info pointer.
1689 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
1690 // Allocate external info struct.
1691 DeclInfo = new (getASTContext()) ExtInfo;
1692 // Restore savedTInfo into (extended) decl info.
1693 getExtInfo()->TInfo = savedTInfo;
1695 // Set the template parameter lists info.
1696 getExtInfo()->setTemplateParameterListsInfo(Context, TPLists);
1699 SourceLocation DeclaratorDecl::getOuterLocStart() const {
1700 return getTemplateOrInnerLocStart(this);
1705 // Helper function: returns true if QT is or contains a type
1706 // having a postfix component.
1707 bool typeIsPostfix(clang::QualType QT) {
1709 const Type* T = QT.getTypePtr();
1710 switch (T->getTypeClass()) {
1714 QT = cast<PointerType>(T)->getPointeeType();
1716 case Type::BlockPointer:
1717 QT = cast<BlockPointerType>(T)->getPointeeType();
1719 case Type::MemberPointer:
1720 QT = cast<MemberPointerType>(T)->getPointeeType();
1722 case Type::LValueReference:
1723 case Type::RValueReference:
1724 QT = cast<ReferenceType>(T)->getPointeeType();
1726 case Type::PackExpansion:
1727 QT = cast<PackExpansionType>(T)->getPattern();
1730 case Type::ConstantArray:
1731 case Type::DependentSizedArray:
1732 case Type::IncompleteArray:
1733 case Type::VariableArray:
1734 case Type::FunctionProto:
1735 case Type::FunctionNoProto:
1743 SourceRange DeclaratorDecl::getSourceRange() const {
1744 SourceLocation RangeEnd = getLocation();
1745 if (TypeSourceInfo *TInfo = getTypeSourceInfo()) {
1746 // If the declaration has no name or the type extends past the name take the
1747 // end location of the type.
1748 if (!getDeclName() || typeIsPostfix(TInfo->getType()))
1749 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
1751 return SourceRange(getOuterLocStart(), RangeEnd);
1754 void QualifierInfo::setTemplateParameterListsInfo(
1755 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
1756 // Free previous template parameters (if any).
1757 if (NumTemplParamLists > 0) {
1758 Context.Deallocate(TemplParamLists);
1759 TemplParamLists = nullptr;
1760 NumTemplParamLists = 0;
1762 // Set info on matched template parameter lists (if any).
1763 if (!TPLists.empty()) {
1764 TemplParamLists = new (Context) TemplateParameterList *[TPLists.size()];
1765 NumTemplParamLists = TPLists.size();
1766 std::copy(TPLists.begin(), TPLists.end(), TemplParamLists);
1770 //===----------------------------------------------------------------------===//
1771 // VarDecl Implementation
1772 //===----------------------------------------------------------------------===//
1774 const char *VarDecl::getStorageClassSpecifierString(StorageClass SC) {
1776 case SC_None: break;
1777 case SC_Auto: return "auto";
1778 case SC_Extern: return "extern";
1779 case SC_PrivateExtern: return "__private_extern__";
1780 case SC_Register: return "register";
1781 case SC_Static: return "static";
1784 llvm_unreachable("Invalid storage class");
1787 VarDecl::VarDecl(Kind DK, ASTContext &C, DeclContext *DC,
1788 SourceLocation StartLoc, SourceLocation IdLoc,
1789 IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo,
1791 : DeclaratorDecl(DK, DC, IdLoc, Id, T, TInfo, StartLoc),
1792 redeclarable_base(C), Init() {
1793 static_assert(sizeof(VarDeclBitfields) <= sizeof(unsigned),
1794 "VarDeclBitfields too large!");
1795 static_assert(sizeof(ParmVarDeclBitfields) <= sizeof(unsigned),
1796 "ParmVarDeclBitfields too large!");
1797 static_assert(sizeof(NonParmVarDeclBitfields) <= sizeof(unsigned),
1798 "NonParmVarDeclBitfields too large!");
1800 VarDeclBits.SClass = SC;
1801 // Everything else is implicitly initialized to false.
1804 VarDecl *VarDecl::Create(ASTContext &C, DeclContext *DC,
1805 SourceLocation StartL, SourceLocation IdL,
1806 IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo,
1808 return new (C, DC) VarDecl(Var, C, DC, StartL, IdL, Id, T, TInfo, S);
1811 VarDecl *VarDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
1813 VarDecl(Var, C, nullptr, SourceLocation(), SourceLocation(), nullptr,
1814 QualType(), nullptr, SC_None);
1817 void VarDecl::setStorageClass(StorageClass SC) {
1818 assert(isLegalForVariable(SC));
1819 VarDeclBits.SClass = SC;
1822 VarDecl::TLSKind VarDecl::getTLSKind() const {
1823 switch (VarDeclBits.TSCSpec) {
1824 case TSCS_unspecified:
1825 if (!hasAttr<ThreadAttr>() &&
1826 !(getASTContext().getLangOpts().OpenMPUseTLS &&
1827 getASTContext().getTargetInfo().isTLSSupported() &&
1828 hasAttr<OMPThreadPrivateDeclAttr>()))
1830 return ((getASTContext().getLangOpts().isCompatibleWithMSVC(
1831 LangOptions::MSVC2015)) ||
1832 hasAttr<OMPThreadPrivateDeclAttr>())
1835 case TSCS___thread: // Fall through.
1836 case TSCS__Thread_local:
1838 case TSCS_thread_local:
1841 llvm_unreachable("Unknown thread storage class specifier!");
1844 SourceRange VarDecl::getSourceRange() const {
1845 if (const Expr *Init = getInit()) {
1846 SourceLocation InitEnd = Init->getLocEnd();
1847 // If Init is implicit, ignore its source range and fallback on
1848 // DeclaratorDecl::getSourceRange() to handle postfix elements.
1849 if (InitEnd.isValid() && InitEnd != getLocation())
1850 return SourceRange(getOuterLocStart(), InitEnd);
1852 return DeclaratorDecl::getSourceRange();
1855 template<typename T>
1856 static LanguageLinkage getDeclLanguageLinkage(const T &D) {
1857 // C++ [dcl.link]p1: All function types, function names with external linkage,
1858 // and variable names with external linkage have a language linkage.
1859 if (!D.hasExternalFormalLinkage())
1860 return NoLanguageLinkage;
1862 // Language linkage is a C++ concept, but saying that everything else in C has
1863 // C language linkage fits the implementation nicely.
1864 ASTContext &Context = D.getASTContext();
1865 if (!Context.getLangOpts().CPlusPlus)
1866 return CLanguageLinkage;
1868 // C++ [dcl.link]p4: A C language linkage is ignored in determining the
1869 // language linkage of the names of class members and the function type of
1870 // class member functions.
1871 const DeclContext *DC = D.getDeclContext();
1873 return CXXLanguageLinkage;
1875 // If the first decl is in an extern "C" context, any other redeclaration
1876 // will have C language linkage. If the first one is not in an extern "C"
1877 // context, we would have reported an error for any other decl being in one.
1878 if (isFirstInExternCContext(&D))
1879 return CLanguageLinkage;
1880 return CXXLanguageLinkage;
1883 template<typename T>
1884 static bool isDeclExternC(const T &D) {
1885 // Since the context is ignored for class members, they can only have C++
1886 // language linkage or no language linkage.
1887 const DeclContext *DC = D.getDeclContext();
1888 if (DC->isRecord()) {
1889 assert(D.getASTContext().getLangOpts().CPlusPlus);
1893 return D.getLanguageLinkage() == CLanguageLinkage;
1896 LanguageLinkage VarDecl::getLanguageLinkage() const {
1897 return getDeclLanguageLinkage(*this);
1900 bool VarDecl::isExternC() const {
1901 return isDeclExternC(*this);
1904 bool VarDecl::isInExternCContext() const {
1905 return getLexicalDeclContext()->isExternCContext();
1908 bool VarDecl::isInExternCXXContext() const {
1909 return getLexicalDeclContext()->isExternCXXContext();
1912 VarDecl *VarDecl::getCanonicalDecl() { return getFirstDecl(); }
1914 VarDecl::DefinitionKind
1915 VarDecl::isThisDeclarationADefinition(ASTContext &C) const {
1916 // C++ [basic.def]p2:
1917 // A declaration is a definition unless [...] it contains the 'extern'
1918 // specifier or a linkage-specification and neither an initializer [...],
1919 // it declares a non-inline static data member in a class declaration [...],
1920 // it declares a static data member outside a class definition and the variable
1921 // was defined within the class with the constexpr specifier [...],
1922 // C++1y [temp.expl.spec]p15:
1923 // An explicit specialization of a static data member or an explicit
1924 // specialization of a static data member template is a definition if the
1925 // declaration includes an initializer; otherwise, it is a declaration.
1927 // FIXME: How do you declare (but not define) a partial specialization of
1928 // a static data member template outside the containing class?
1929 if (isThisDeclarationADemotedDefinition())
1930 return DeclarationOnly;
1932 if (isStaticDataMember()) {
1933 if (isOutOfLine() &&
1934 !(getCanonicalDecl()->isInline() &&
1935 getCanonicalDecl()->isConstexpr()) &&
1937 // If the first declaration is out-of-line, this may be an
1938 // instantiation of an out-of-line partial specialization of a variable
1939 // template for which we have not yet instantiated the initializer.
1940 (getFirstDecl()->isOutOfLine()
1941 ? getTemplateSpecializationKind() == TSK_Undeclared
1942 : getTemplateSpecializationKind() !=
1943 TSK_ExplicitSpecialization) ||
1944 isa<VarTemplatePartialSpecializationDecl>(this)))
1946 else if (!isOutOfLine() && isInline())
1949 return DeclarationOnly;
1952 // A definition of an identifier is a declaration for that identifier that
1953 // [...] causes storage to be reserved for that object.
1954 // Note: that applies for all non-file-scope objects.
1956 // If the declaration of an identifier for an object has file scope and an
1957 // initializer, the declaration is an external definition for the identifier
1961 if (hasDefiningAttr())
1964 if (const auto *SAA = getAttr<SelectAnyAttr>())
1965 if (!SAA->isInherited())
1968 // A variable template specialization (other than a static data member
1969 // template or an explicit specialization) is a declaration until we
1970 // instantiate its initializer.
1971 if (isa<VarTemplateSpecializationDecl>(this) &&
1972 getTemplateSpecializationKind() != TSK_ExplicitSpecialization)
1973 return DeclarationOnly;
1975 if (hasExternalStorage())
1976 return DeclarationOnly;
1979 // A declaration directly contained in a linkage-specification is treated
1980 // as if it contains the extern specifier for the purpose of determining
1981 // the linkage of the declared name and whether it is a definition.
1982 if (isSingleLineLanguageLinkage(*this))
1983 return DeclarationOnly;
1986 // A declaration of an object that has file scope without an initializer,
1987 // and without a storage class specifier or the scs 'static', constitutes
1988 // a tentative definition.
1989 // No such thing in C++.
1990 if (!C.getLangOpts().CPlusPlus && isFileVarDecl())
1991 return TentativeDefinition;
1993 // What's left is (in C, block-scope) declarations without initializers or
1994 // external storage. These are definitions.
1998 VarDecl *VarDecl::getActingDefinition() {
1999 DefinitionKind Kind = isThisDeclarationADefinition();
2000 if (Kind != TentativeDefinition)
2003 VarDecl *LastTentative = nullptr;
2004 VarDecl *First = getFirstDecl();
2005 for (auto I : First->redecls()) {
2006 Kind = I->isThisDeclarationADefinition();
2007 if (Kind == Definition)
2009 else if (Kind == TentativeDefinition)
2012 return LastTentative;
2015 VarDecl *VarDecl::getDefinition(ASTContext &C) {
2016 VarDecl *First = getFirstDecl();
2017 for (auto I : First->redecls()) {
2018 if (I->isThisDeclarationADefinition(C) == Definition)
2024 VarDecl::DefinitionKind VarDecl::hasDefinition(ASTContext &C) const {
2025 DefinitionKind Kind = DeclarationOnly;
2027 const VarDecl *First = getFirstDecl();
2028 for (auto I : First->redecls()) {
2029 Kind = std::max(Kind, I->isThisDeclarationADefinition(C));
2030 if (Kind == Definition)
2037 const Expr *VarDecl::getAnyInitializer(const VarDecl *&D) const {
2038 for (auto I : redecls()) {
2039 if (auto Expr = I->getInit()) {
2047 bool VarDecl::hasInit() const {
2048 if (auto *P = dyn_cast<ParmVarDecl>(this))
2049 if (P->hasUnparsedDefaultArg() || P->hasUninstantiatedDefaultArg())
2052 return !Init.isNull();
2055 Expr *VarDecl::getInit() {
2059 if (auto *S = Init.dyn_cast<Stmt *>())
2060 return cast<Expr>(S);
2062 return cast_or_null<Expr>(Init.get<EvaluatedStmt *>()->Value);
2065 Stmt **VarDecl::getInitAddress() {
2066 if (auto *ES = Init.dyn_cast<EvaluatedStmt *>())
2069 return Init.getAddrOfPtr1();
2072 bool VarDecl::isOutOfLine() const {
2073 if (Decl::isOutOfLine())
2076 if (!isStaticDataMember())
2079 // If this static data member was instantiated from a static data member of
2080 // a class template, check whether that static data member was defined
2082 if (VarDecl *VD = getInstantiatedFromStaticDataMember())
2083 return VD->isOutOfLine();
2088 void VarDecl::setInit(Expr *I) {
2089 if (auto *Eval = Init.dyn_cast<EvaluatedStmt *>()) {
2090 Eval->~EvaluatedStmt();
2091 getASTContext().Deallocate(Eval);
2097 bool VarDecl::isUsableInConstantExpressions(ASTContext &C) const {
2098 const LangOptions &Lang = C.getLangOpts();
2100 if (!Lang.CPlusPlus)
2103 // In C++11, any variable of reference type can be used in a constant
2104 // expression if it is initialized by a constant expression.
2105 if (Lang.CPlusPlus11 && getType()->isReferenceType())
2108 // Only const objects can be used in constant expressions in C++. C++98 does
2109 // not require the variable to be non-volatile, but we consider this to be a
2111 if (!getType().isConstQualified() || getType().isVolatileQualified())
2114 // In C++, const, non-volatile variables of integral or enumeration types
2115 // can be used in constant expressions.
2116 if (getType()->isIntegralOrEnumerationType())
2119 // Additionally, in C++11, non-volatile constexpr variables can be used in
2120 // constant expressions.
2121 return Lang.CPlusPlus11 && isConstexpr();
2124 /// Convert the initializer for this declaration to the elaborated EvaluatedStmt
2125 /// form, which contains extra information on the evaluated value of the
2127 EvaluatedStmt *VarDecl::ensureEvaluatedStmt() const {
2128 auto *Eval = Init.dyn_cast<EvaluatedStmt *>();
2130 // Note: EvaluatedStmt contains an APValue, which usually holds
2131 // resources not allocated from the ASTContext. We need to do some
2132 // work to avoid leaking those, but we do so in VarDecl::evaluateValue
2133 // where we can detect whether there's anything to clean up or not.
2134 Eval = new (getASTContext()) EvaluatedStmt;
2135 Eval->Value = Init.get<Stmt *>();
2141 APValue *VarDecl::evaluateValue() const {
2142 SmallVector<PartialDiagnosticAt, 8> Notes;
2143 return evaluateValue(Notes);
2147 // Destroy an APValue that was allocated in an ASTContext.
2148 void DestroyAPValue(void* UntypedValue) {
2149 static_cast<APValue*>(UntypedValue)->~APValue();
2153 APValue *VarDecl::evaluateValue(
2154 SmallVectorImpl<PartialDiagnosticAt> &Notes) const {
2155 EvaluatedStmt *Eval = ensureEvaluatedStmt();
2157 // We only produce notes indicating why an initializer is non-constant the
2158 // first time it is evaluated. FIXME: The notes won't always be emitted the
2159 // first time we try evaluation, so might not be produced at all.
2160 if (Eval->WasEvaluated)
2161 return Eval->Evaluated.isUninit() ? nullptr : &Eval->Evaluated;
2163 const auto *Init = cast<Expr>(Eval->Value);
2164 assert(!Init->isValueDependent());
2166 if (Eval->IsEvaluating) {
2167 // FIXME: Produce a diagnostic for self-initialization.
2168 Eval->CheckedICE = true;
2169 Eval->IsICE = false;
2173 Eval->IsEvaluating = true;
2175 bool Result = Init->EvaluateAsInitializer(Eval->Evaluated, getASTContext(),
2178 // Ensure the computed APValue is cleaned up later if evaluation succeeded,
2179 // or that it's empty (so that there's nothing to clean up) if evaluation
2182 Eval->Evaluated = APValue();
2183 else if (Eval->Evaluated.needsCleanup())
2184 getASTContext().AddDeallocation(DestroyAPValue, &Eval->Evaluated);
2186 Eval->IsEvaluating = false;
2187 Eval->WasEvaluated = true;
2189 // In C++11, we have determined whether the initializer was a constant
2190 // expression as a side-effect.
2191 if (getASTContext().getLangOpts().CPlusPlus11 && !Eval->CheckedICE) {
2192 Eval->CheckedICE = true;
2193 Eval->IsICE = Result && Notes.empty();
2196 return Result ? &Eval->Evaluated : nullptr;
2199 APValue *VarDecl::getEvaluatedValue() const {
2200 if (EvaluatedStmt *Eval = Init.dyn_cast<EvaluatedStmt *>())
2201 if (Eval->WasEvaluated)
2202 return &Eval->Evaluated;
2207 bool VarDecl::isInitKnownICE() const {
2208 if (EvaluatedStmt *Eval = Init.dyn_cast<EvaluatedStmt *>())
2209 return Eval->CheckedICE;
2214 bool VarDecl::isInitICE() const {
2215 assert(isInitKnownICE() &&
2216 "Check whether we already know that the initializer is an ICE");
2217 return Init.get<EvaluatedStmt *>()->IsICE;
2220 bool VarDecl::checkInitIsICE() const {
2221 // Initializers of weak variables are never ICEs.
2225 EvaluatedStmt *Eval = ensureEvaluatedStmt();
2226 if (Eval->CheckedICE)
2227 // We have already checked whether this subexpression is an
2228 // integral constant expression.
2231 const auto *Init = cast<Expr>(Eval->Value);
2232 assert(!Init->isValueDependent());
2234 // In C++11, evaluate the initializer to check whether it's a constant
2236 if (getASTContext().getLangOpts().CPlusPlus11) {
2237 SmallVector<PartialDiagnosticAt, 8> Notes;
2238 evaluateValue(Notes);
2242 // It's an ICE whether or not the definition we found is
2243 // out-of-line. See DR 721 and the discussion in Clang PR
2244 // 6206 for details.
2246 if (Eval->CheckingICE)
2248 Eval->CheckingICE = true;
2250 Eval->IsICE = Init->isIntegerConstantExpr(getASTContext());
2251 Eval->CheckingICE = false;
2252 Eval->CheckedICE = true;
2256 VarDecl *VarDecl::getTemplateInstantiationPattern() const {
2257 // If it's a variable template specialization, find the template or partial
2258 // specialization from which it was instantiated.
2259 if (auto *VDTemplSpec = dyn_cast<VarTemplateSpecializationDecl>(this)) {
2260 auto From = VDTemplSpec->getInstantiatedFrom();
2261 if (auto *VTD = From.dyn_cast<VarTemplateDecl *>()) {
2262 while (auto *NewVTD = VTD->getInstantiatedFromMemberTemplate()) {
2263 if (NewVTD->isMemberSpecialization())
2267 return VTD->getTemplatedDecl()->getDefinition();
2270 From.dyn_cast<VarTemplatePartialSpecializationDecl *>()) {
2271 while (auto *NewVTPSD = VTPSD->getInstantiatedFromMember()) {
2272 if (NewVTPSD->isMemberSpecialization())
2276 return VTPSD->getDefinition();
2280 if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo()) {
2281 if (isTemplateInstantiation(MSInfo->getTemplateSpecializationKind())) {
2282 VarDecl *VD = getInstantiatedFromStaticDataMember();
2283 while (auto *NewVD = VD->getInstantiatedFromStaticDataMember())
2285 return VD->getDefinition();
2289 if (VarTemplateDecl *VarTemplate = getDescribedVarTemplate()) {
2291 while (VarTemplate->getInstantiatedFromMemberTemplate()) {
2292 if (VarTemplate->isMemberSpecialization())
2294 VarTemplate = VarTemplate->getInstantiatedFromMemberTemplate();
2297 assert((!VarTemplate->getTemplatedDecl() ||
2298 !isTemplateInstantiation(getTemplateSpecializationKind())) &&
2299 "couldn't find pattern for variable instantiation");
2301 return VarTemplate->getTemplatedDecl();
2306 VarDecl *VarDecl::getInstantiatedFromStaticDataMember() const {
2307 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2308 return cast<VarDecl>(MSI->getInstantiatedFrom());
2313 TemplateSpecializationKind VarDecl::getTemplateSpecializationKind() const {
2314 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
2315 return Spec->getSpecializationKind();
2317 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2318 return MSI->getTemplateSpecializationKind();
2320 return TSK_Undeclared;
2323 SourceLocation VarDecl::getPointOfInstantiation() const {
2324 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
2325 return Spec->getPointOfInstantiation();
2327 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2328 return MSI->getPointOfInstantiation();
2330 return SourceLocation();
2333 VarTemplateDecl *VarDecl::getDescribedVarTemplate() const {
2334 return getASTContext().getTemplateOrSpecializationInfo(this)
2335 .dyn_cast<VarTemplateDecl *>();
2338 void VarDecl::setDescribedVarTemplate(VarTemplateDecl *Template) {
2339 getASTContext().setTemplateOrSpecializationInfo(this, Template);
2342 MemberSpecializationInfo *VarDecl::getMemberSpecializationInfo() const {
2343 if (isStaticDataMember())
2345 // return getASTContext().getInstantiatedFromStaticDataMember(this);
2346 return getASTContext().getTemplateOrSpecializationInfo(this)
2347 .dyn_cast<MemberSpecializationInfo *>();
2351 void VarDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
2352 SourceLocation PointOfInstantiation) {
2353 assert((isa<VarTemplateSpecializationDecl>(this) ||
2354 getMemberSpecializationInfo()) &&
2355 "not a variable or static data member template specialization");
2357 if (VarTemplateSpecializationDecl *Spec =
2358 dyn_cast<VarTemplateSpecializationDecl>(this)) {
2359 Spec->setSpecializationKind(TSK);
2360 if (TSK != TSK_ExplicitSpecialization && PointOfInstantiation.isValid() &&
2361 Spec->getPointOfInstantiation().isInvalid())
2362 Spec->setPointOfInstantiation(PointOfInstantiation);
2365 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo()) {
2366 MSI->setTemplateSpecializationKind(TSK);
2367 if (TSK != TSK_ExplicitSpecialization && PointOfInstantiation.isValid() &&
2368 MSI->getPointOfInstantiation().isInvalid())
2369 MSI->setPointOfInstantiation(PointOfInstantiation);
2374 VarDecl::setInstantiationOfStaticDataMember(VarDecl *VD,
2375 TemplateSpecializationKind TSK) {
2376 assert(getASTContext().getTemplateOrSpecializationInfo(this).isNull() &&
2377 "Previous template or instantiation?");
2378 getASTContext().setInstantiatedFromStaticDataMember(this, VD, TSK);
2381 //===----------------------------------------------------------------------===//
2382 // ParmVarDecl Implementation
2383 //===----------------------------------------------------------------------===//
2385 ParmVarDecl *ParmVarDecl::Create(ASTContext &C, DeclContext *DC,
2386 SourceLocation StartLoc,
2387 SourceLocation IdLoc, IdentifierInfo *Id,
2388 QualType T, TypeSourceInfo *TInfo,
2389 StorageClass S, Expr *DefArg) {
2390 return new (C, DC) ParmVarDecl(ParmVar, C, DC, StartLoc, IdLoc, Id, T, TInfo,
2394 QualType ParmVarDecl::getOriginalType() const {
2395 TypeSourceInfo *TSI = getTypeSourceInfo();
2396 QualType T = TSI ? TSI->getType() : getType();
2397 if (const auto *DT = dyn_cast<DecayedType>(T))
2398 return DT->getOriginalType();
2402 ParmVarDecl *ParmVarDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
2404 ParmVarDecl(ParmVar, C, nullptr, SourceLocation(), SourceLocation(),
2405 nullptr, QualType(), nullptr, SC_None, nullptr);
2408 SourceRange ParmVarDecl::getSourceRange() const {
2409 if (!hasInheritedDefaultArg()) {
2410 SourceRange ArgRange = getDefaultArgRange();
2411 if (ArgRange.isValid())
2412 return SourceRange(getOuterLocStart(), ArgRange.getEnd());
2415 // DeclaratorDecl considers the range of postfix types as overlapping with the
2416 // declaration name, but this is not the case with parameters in ObjC methods.
2417 if (isa<ObjCMethodDecl>(getDeclContext()))
2418 return SourceRange(DeclaratorDecl::getLocStart(), getLocation());
2420 return DeclaratorDecl::getSourceRange();
2423 Expr *ParmVarDecl::getDefaultArg() {
2424 assert(!hasUnparsedDefaultArg() && "Default argument is not yet parsed!");
2425 assert(!hasUninstantiatedDefaultArg() &&
2426 "Default argument is not yet instantiated!");
2428 Expr *Arg = getInit();
2429 if (auto *E = dyn_cast_or_null<ExprWithCleanups>(Arg))
2430 return E->getSubExpr();
2435 void ParmVarDecl::setDefaultArg(Expr *defarg) {
2436 ParmVarDeclBits.DefaultArgKind = DAK_Normal;
2440 SourceRange ParmVarDecl::getDefaultArgRange() const {
2441 switch (ParmVarDeclBits.DefaultArgKind) {
2444 // Nothing we can do here.
2445 return SourceRange();
2447 case DAK_Uninstantiated:
2448 return getUninstantiatedDefaultArg()->getSourceRange();
2451 if (const Expr *E = getInit())
2452 return E->getSourceRange();
2454 // Missing an actual expression, may be invalid.
2455 return SourceRange();
2457 llvm_unreachable("Invalid default argument kind.");
2460 void ParmVarDecl::setUninstantiatedDefaultArg(Expr *arg) {
2461 ParmVarDeclBits.DefaultArgKind = DAK_Uninstantiated;
2465 Expr *ParmVarDecl::getUninstantiatedDefaultArg() {
2466 assert(hasUninstantiatedDefaultArg() &&
2467 "Wrong kind of initialization expression!");
2468 return cast_or_null<Expr>(Init.get<Stmt *>());
2471 bool ParmVarDecl::hasDefaultArg() const {
2472 // FIXME: We should just return false for DAK_None here once callers are
2473 // prepared for the case that we encountered an invalid default argument and
2474 // were unable to even build an invalid expression.
2475 return hasUnparsedDefaultArg() || hasUninstantiatedDefaultArg() ||
2479 bool ParmVarDecl::isParameterPack() const {
2480 return isa<PackExpansionType>(getType());
2483 void ParmVarDecl::setParameterIndexLarge(unsigned parameterIndex) {
2484 getASTContext().setParameterIndex(this, parameterIndex);
2485 ParmVarDeclBits.ParameterIndex = ParameterIndexSentinel;
2488 unsigned ParmVarDecl::getParameterIndexLarge() const {
2489 return getASTContext().getParameterIndex(this);
2492 //===----------------------------------------------------------------------===//
2493 // FunctionDecl Implementation
2494 //===----------------------------------------------------------------------===//
2496 void FunctionDecl::getNameForDiagnostic(
2497 raw_ostream &OS, const PrintingPolicy &Policy, bool Qualified) const {
2498 NamedDecl::getNameForDiagnostic(OS, Policy, Qualified);
2499 const TemplateArgumentList *TemplateArgs = getTemplateSpecializationArgs();
2501 TemplateSpecializationType::PrintTemplateArgumentList(
2502 OS, TemplateArgs->asArray(), Policy);
2505 bool FunctionDecl::isVariadic() const {
2506 if (const auto *FT = getType()->getAs<FunctionProtoType>())
2507 return FT->isVariadic();
2511 bool FunctionDecl::hasBody(const FunctionDecl *&Definition) const {
2512 for (auto I : redecls()) {
2513 if (I->Body || I->IsLateTemplateParsed) {
2522 bool FunctionDecl::hasTrivialBody() const
2524 Stmt *S = getBody();
2526 // Since we don't have a body for this function, we don't know if it's
2531 if (isa<CompoundStmt>(S) && cast<CompoundStmt>(S)->body_empty())
2536 bool FunctionDecl::isDefined(const FunctionDecl *&Definition) const {
2537 for (auto I : redecls()) {
2538 if (I->IsDeleted || I->IsDefaulted || I->Body || I->IsLateTemplateParsed ||
2539 I->hasDefiningAttr()) {
2540 Definition = I->IsDeleted ? I->getCanonicalDecl() : I;
2548 Stmt *FunctionDecl::getBody(const FunctionDecl *&Definition) const {
2549 if (!hasBody(Definition))
2552 if (Definition->Body)
2553 return Definition->Body.get(getASTContext().getExternalSource());
2558 void FunctionDecl::setBody(Stmt *B) {
2561 EndRangeLoc = B->getLocEnd();
2564 void FunctionDecl::setPure(bool P) {
2567 if (auto *Parent = dyn_cast<CXXRecordDecl>(getDeclContext()))
2568 Parent->markedVirtualFunctionPure();
2571 template<std::size_t Len>
2572 static bool isNamed(const NamedDecl *ND, const char (&Str)[Len]) {
2573 IdentifierInfo *II = ND->getIdentifier();
2574 return II && II->isStr(Str);
2577 bool FunctionDecl::isMain() const {
2578 const TranslationUnitDecl *tunit =
2579 dyn_cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext());
2581 !tunit->getASTContext().getLangOpts().Freestanding &&
2582 isNamed(this, "main");
2585 bool FunctionDecl::isMSVCRTEntryPoint() const {
2586 const TranslationUnitDecl *TUnit =
2587 dyn_cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext());
2591 // Even though we aren't really targeting MSVCRT if we are freestanding,
2592 // semantic analysis for these functions remains the same.
2594 // MSVCRT entry points only exist on MSVCRT targets.
2595 if (!TUnit->getASTContext().getTargetInfo().getTriple().isOSMSVCRT())
2598 // Nameless functions like constructors cannot be entry points.
2599 if (!getIdentifier())
2602 return llvm::StringSwitch<bool>(getName())
2603 .Cases("main", // an ANSI console app
2604 "wmain", // a Unicode console App
2605 "WinMain", // an ANSI GUI app
2606 "wWinMain", // a Unicode GUI app
2612 bool FunctionDecl::isReservedGlobalPlacementOperator() const {
2613 assert(getDeclName().getNameKind() == DeclarationName::CXXOperatorName);
2614 assert(getDeclName().getCXXOverloadedOperator() == OO_New ||
2615 getDeclName().getCXXOverloadedOperator() == OO_Delete ||
2616 getDeclName().getCXXOverloadedOperator() == OO_Array_New ||
2617 getDeclName().getCXXOverloadedOperator() == OO_Array_Delete);
2619 if (!getDeclContext()->getRedeclContext()->isTranslationUnit())
2622 const auto *proto = getType()->castAs<FunctionProtoType>();
2623 if (proto->getNumParams() != 2 || proto->isVariadic())
2626 ASTContext &Context =
2627 cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext())
2630 // The result type and first argument type are constant across all
2631 // these operators. The second argument must be exactly void*.
2632 return (proto->getParamType(1).getCanonicalType() == Context.VoidPtrTy);
2635 bool FunctionDecl::isReplaceableGlobalAllocationFunction() const {
2636 if (getDeclName().getNameKind() != DeclarationName::CXXOperatorName)
2638 if (getDeclName().getCXXOverloadedOperator() != OO_New &&
2639 getDeclName().getCXXOverloadedOperator() != OO_Delete &&
2640 getDeclName().getCXXOverloadedOperator() != OO_Array_New &&
2641 getDeclName().getCXXOverloadedOperator() != OO_Array_Delete)
2644 if (isa<CXXRecordDecl>(getDeclContext()))
2647 // This can only fail for an invalid 'operator new' declaration.
2648 if (!getDeclContext()->getRedeclContext()->isTranslationUnit())
2651 const auto *FPT = getType()->castAs<FunctionProtoType>();
2652 if (FPT->getNumParams() == 0 || FPT->getNumParams() > 3 || FPT->isVariadic())
2655 // If this is a single-parameter function, it must be a replaceable global
2656 // allocation or deallocation function.
2657 if (FPT->getNumParams() == 1)
2660 unsigned Params = 1;
2661 QualType Ty = FPT->getParamType(Params);
2662 ASTContext &Ctx = getASTContext();
2664 auto Consume = [&] {
2666 Ty = Params < FPT->getNumParams() ? FPT->getParamType(Params) : QualType();
2669 // In C++14, the next parameter can be a 'std::size_t' for sized delete.
2670 bool IsSizedDelete = false;
2671 if (Ctx.getLangOpts().SizedDeallocation &&
2672 (getDeclName().getCXXOverloadedOperator() == OO_Delete ||
2673 getDeclName().getCXXOverloadedOperator() == OO_Array_Delete) &&
2674 Ctx.hasSameType(Ty, Ctx.getSizeType())) {
2675 IsSizedDelete = true;
2679 // In C++17, the next parameter can be a 'std::align_val_t' for aligned
2681 if (Ctx.getLangOpts().AlignedAllocation && !Ty.isNull() && Ty->isAlignValT())
2684 // Finally, if this is not a sized delete, the final parameter can
2685 // be a 'const std::nothrow_t&'.
2686 if (!IsSizedDelete && !Ty.isNull() && Ty->isReferenceType()) {
2687 Ty = Ty->getPointeeType();
2688 if (Ty.getCVRQualifiers() != Qualifiers::Const)
2690 const CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
2691 if (RD && isNamed(RD, "nothrow_t") && RD->isInStdNamespace())
2695 return Params == FPT->getNumParams();
2698 LanguageLinkage FunctionDecl::getLanguageLinkage() const {
2699 return getDeclLanguageLinkage(*this);
2702 bool FunctionDecl::isExternC() const {
2703 return isDeclExternC(*this);
2706 bool FunctionDecl::isInExternCContext() const {
2707 return getLexicalDeclContext()->isExternCContext();
2710 bool FunctionDecl::isInExternCXXContext() const {
2711 return getLexicalDeclContext()->isExternCXXContext();
2714 bool FunctionDecl::isGlobal() const {
2715 if (const auto *Method = dyn_cast<CXXMethodDecl>(this))
2716 return Method->isStatic();
2718 if (getCanonicalDecl()->getStorageClass() == SC_Static)
2721 for (const DeclContext *DC = getDeclContext();
2723 DC = DC->getParent()) {
2724 if (const auto *Namespace = cast<NamespaceDecl>(DC)) {
2725 if (!Namespace->getDeclName())
2734 bool FunctionDecl::isNoReturn() const {
2735 if (hasAttr<NoReturnAttr>() || hasAttr<CXX11NoReturnAttr>() ||
2736 hasAttr<C11NoReturnAttr>())
2739 if (auto *FnTy = getType()->getAs<FunctionType>())
2740 return FnTy->getNoReturnAttr();
2746 FunctionDecl::setPreviousDeclaration(FunctionDecl *PrevDecl) {
2747 redeclarable_base::setPreviousDecl(PrevDecl);
2749 if (FunctionTemplateDecl *FunTmpl = getDescribedFunctionTemplate()) {
2750 FunctionTemplateDecl *PrevFunTmpl
2751 = PrevDecl? PrevDecl->getDescribedFunctionTemplate() : nullptr;
2752 assert((!PrevDecl || PrevFunTmpl) && "Function/function template mismatch");
2753 FunTmpl->setPreviousDecl(PrevFunTmpl);
2756 if (PrevDecl && PrevDecl->IsInline)
2760 FunctionDecl *FunctionDecl::getCanonicalDecl() { return getFirstDecl(); }
2762 /// \brief Returns a value indicating whether this function
2763 /// corresponds to a builtin function.
2765 /// The function corresponds to a built-in function if it is
2766 /// declared at translation scope or within an extern "C" block and
2767 /// its name matches with the name of a builtin. The returned value
2768 /// will be 0 for functions that do not correspond to a builtin, a
2769 /// value of type \c Builtin::ID if in the target-independent range
2770 /// \c [1,Builtin::First), or a target-specific builtin value.
2771 unsigned FunctionDecl::getBuiltinID() const {
2772 if (!getIdentifier())
2775 unsigned BuiltinID = getIdentifier()->getBuiltinID();
2779 ASTContext &Context = getASTContext();
2780 if (Context.getLangOpts().CPlusPlus) {
2781 const auto *LinkageDecl =
2782 dyn_cast<LinkageSpecDecl>(getFirstDecl()->getDeclContext());
2783 // In C++, the first declaration of a builtin is always inside an implicit
2785 // FIXME: A recognised library function may not be directly in an extern "C"
2786 // declaration, for instance "extern "C" { namespace std { decl } }".
2788 if (BuiltinID == Builtin::BI__GetExceptionInfo &&
2789 Context.getTargetInfo().getCXXABI().isMicrosoft())
2790 return Builtin::BI__GetExceptionInfo;
2793 if (LinkageDecl->getLanguage() != LinkageSpecDecl::lang_c)
2797 // If the function is marked "overloadable", it has a different mangled name
2798 // and is not the C library function.
2799 if (hasAttr<OverloadableAttr>())
2802 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))
2805 // This function has the name of a known C library
2806 // function. Determine whether it actually refers to the C library
2807 // function or whether it just has the same name.
2809 // If this is a static function, it's not a builtin.
2810 if (getStorageClass() == SC_Static)
2813 // OpenCL v1.2 s6.9.f - The library functions defined in
2814 // the C99 standard headers are not available.
2815 if (Context.getLangOpts().OpenCL &&
2816 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))
2823 /// getNumParams - Return the number of parameters this function must have
2824 /// based on its FunctionType. This is the length of the ParamInfo array
2825 /// after it has been created.
2826 unsigned FunctionDecl::getNumParams() const {
2827 const auto *FPT = getType()->getAs<FunctionProtoType>();
2828 return FPT ? FPT->getNumParams() : 0;
2831 void FunctionDecl::setParams(ASTContext &C,
2832 ArrayRef<ParmVarDecl *> NewParamInfo) {
2833 assert(!ParamInfo && "Already has param info!");
2834 assert(NewParamInfo.size() == getNumParams() && "Parameter count mismatch!");
2836 // Zero params -> null pointer.
2837 if (!NewParamInfo.empty()) {
2838 ParamInfo = new (C) ParmVarDecl*[NewParamInfo.size()];
2839 std::copy(NewParamInfo.begin(), NewParamInfo.end(), ParamInfo);
2843 /// getMinRequiredArguments - Returns the minimum number of arguments
2844 /// needed to call this function. This may be fewer than the number of
2845 /// function parameters, if some of the parameters have default
2846 /// arguments (in C++) or are parameter packs (C++11).
2847 unsigned FunctionDecl::getMinRequiredArguments() const {
2848 if (!getASTContext().getLangOpts().CPlusPlus)
2849 return getNumParams();
2851 unsigned NumRequiredArgs = 0;
2852 for (auto *Param : parameters())
2853 if (!Param->isParameterPack() && !Param->hasDefaultArg())
2855 return NumRequiredArgs;
2858 /// \brief The combination of the extern and inline keywords under MSVC forces
2859 /// the function to be required.
2861 /// Note: This function assumes that we will only get called when isInlined()
2862 /// would return true for this FunctionDecl.
2863 bool FunctionDecl::isMSExternInline() const {
2864 assert(isInlined() && "expected to get called on an inlined function!");
2866 const ASTContext &Context = getASTContext();
2867 if (!Context.getTargetInfo().getCXXABI().isMicrosoft() &&
2868 !hasAttr<DLLExportAttr>())
2871 for (const FunctionDecl *FD = getMostRecentDecl(); FD;
2872 FD = FD->getPreviousDecl())
2873 if (!FD->isImplicit() && FD->getStorageClass() == SC_Extern)
2879 static bool redeclForcesDefMSVC(const FunctionDecl *Redecl) {
2880 if (Redecl->getStorageClass() != SC_Extern)
2883 for (const FunctionDecl *FD = Redecl->getPreviousDecl(); FD;
2884 FD = FD->getPreviousDecl())
2885 if (!FD->isImplicit() && FD->getStorageClass() == SC_Extern)
2891 static bool RedeclForcesDefC99(const FunctionDecl *Redecl) {
2892 // Only consider file-scope declarations in this test.
2893 if (!Redecl->getLexicalDeclContext()->isTranslationUnit())
2896 // Only consider explicit declarations; the presence of a builtin for a
2897 // libcall shouldn't affect whether a definition is externally visible.
2898 if (Redecl->isImplicit())
2901 if (!Redecl->isInlineSpecified() || Redecl->getStorageClass() == SC_Extern)
2902 return true; // Not an inline definition
2907 /// \brief For a function declaration in C or C++, determine whether this
2908 /// declaration causes the definition to be externally visible.
2910 /// For instance, this determines if adding the current declaration to the set
2911 /// of redeclarations of the given functions causes
2912 /// isInlineDefinitionExternallyVisible to change from false to true.
2913 bool FunctionDecl::doesDeclarationForceExternallyVisibleDefinition() const {
2914 assert(!doesThisDeclarationHaveABody() &&
2915 "Must have a declaration without a body.");
2917 ASTContext &Context = getASTContext();
2919 if (Context.getLangOpts().MSVCCompat) {
2920 const FunctionDecl *Definition;
2921 if (hasBody(Definition) && Definition->isInlined() &&
2922 redeclForcesDefMSVC(this))
2926 if (Context.getLangOpts().GNUInline || hasAttr<GNUInlineAttr>()) {
2927 // With GNU inlining, a declaration with 'inline' but not 'extern', forces
2928 // an externally visible definition.
2930 // FIXME: What happens if gnu_inline gets added on after the first
2932 if (!isInlineSpecified() || getStorageClass() == SC_Extern)
2935 const FunctionDecl *Prev = this;
2936 bool FoundBody = false;
2937 while ((Prev = Prev->getPreviousDecl())) {
2938 FoundBody |= Prev->Body.isValid();
2941 // If it's not the case that both 'inline' and 'extern' are
2942 // specified on the definition, then it is always externally visible.
2943 if (!Prev->isInlineSpecified() ||
2944 Prev->getStorageClass() != SC_Extern)
2946 } else if (Prev->isInlineSpecified() &&
2947 Prev->getStorageClass() != SC_Extern) {
2954 if (Context.getLangOpts().CPlusPlus)
2958 // [...] If all of the file scope declarations for a function in a
2959 // translation unit include the inline function specifier without extern,
2960 // then the definition in that translation unit is an inline definition.
2961 if (isInlineSpecified() && getStorageClass() != SC_Extern)
2963 const FunctionDecl *Prev = this;
2964 bool FoundBody = false;
2965 while ((Prev = Prev->getPreviousDecl())) {
2966 FoundBody |= Prev->Body.isValid();
2967 if (RedeclForcesDefC99(Prev))
2973 SourceRange FunctionDecl::getReturnTypeSourceRange() const {
2974 const TypeSourceInfo *TSI = getTypeSourceInfo();
2976 return SourceRange();
2977 FunctionTypeLoc FTL =
2978 TSI->getTypeLoc().IgnoreParens().getAs<FunctionTypeLoc>();
2980 return SourceRange();
2982 // Skip self-referential return types.
2983 const SourceManager &SM = getASTContext().getSourceManager();
2984 SourceRange RTRange = FTL.getReturnLoc().getSourceRange();
2985 SourceLocation Boundary = getNameInfo().getLocStart();
2986 if (RTRange.isInvalid() || Boundary.isInvalid() ||
2987 !SM.isBeforeInTranslationUnit(RTRange.getEnd(), Boundary))
2988 return SourceRange();
2993 SourceRange FunctionDecl::getExceptionSpecSourceRange() const {
2994 const TypeSourceInfo *TSI = getTypeSourceInfo();
2996 return SourceRange();
2997 FunctionTypeLoc FTL =
2998 TSI->getTypeLoc().IgnoreParens().getAs<FunctionTypeLoc>();
3000 return SourceRange();
3002 return FTL.getExceptionSpecRange();
3005 const Attr *FunctionDecl::getUnusedResultAttr() const {
3006 QualType RetType = getReturnType();
3007 if (RetType->isRecordType()) {
3008 const CXXRecordDecl *Ret = RetType->getAsCXXRecordDecl();
3009 const auto *MD = dyn_cast<CXXMethodDecl>(this);
3010 if (Ret && !(MD && MD->getCorrespondingMethodInClass(Ret, true))) {
3011 if (const auto *R = Ret->getAttr<WarnUnusedResultAttr>())
3014 } else if (const auto *ET = RetType->getAs<EnumType>()) {
3015 if (const EnumDecl *ED = ET->getDecl()) {
3016 if (const auto *R = ED->getAttr<WarnUnusedResultAttr>())
3020 return getAttr<WarnUnusedResultAttr>();
3023 /// \brief For an inline function definition in C, or for a gnu_inline function
3024 /// in C++, determine whether the definition will be externally visible.
3026 /// Inline function definitions are always available for inlining optimizations.
3027 /// However, depending on the language dialect, declaration specifiers, and
3028 /// attributes, the definition of an inline function may or may not be
3029 /// "externally" visible to other translation units in the program.
3031 /// In C99, inline definitions are not externally visible by default. However,
3032 /// if even one of the global-scope declarations is marked "extern inline", the
3033 /// inline definition becomes externally visible (C99 6.7.4p6).
3035 /// In GNU89 mode, or if the gnu_inline attribute is attached to the function
3036 /// definition, we use the GNU semantics for inline, which are nearly the
3037 /// opposite of C99 semantics. In particular, "inline" by itself will create
3038 /// an externally visible symbol, but "extern inline" will not create an
3039 /// externally visible symbol.
3040 bool FunctionDecl::isInlineDefinitionExternallyVisible() const {
3041 assert((doesThisDeclarationHaveABody() || willHaveBody()) &&
3042 "Must be a function definition");
3043 assert(isInlined() && "Function must be inline");
3044 ASTContext &Context = getASTContext();
3046 if (Context.getLangOpts().GNUInline || hasAttr<GNUInlineAttr>()) {
3047 // Note: If you change the logic here, please change
3048 // doesDeclarationForceExternallyVisibleDefinition as well.
3050 // If it's not the case that both 'inline' and 'extern' are
3051 // specified on the definition, then this inline definition is
3052 // externally visible.
3053 if (!(isInlineSpecified() && getStorageClass() == SC_Extern))
3056 // If any declaration is 'inline' but not 'extern', then this definition
3057 // is externally visible.
3058 for (auto Redecl : redecls()) {
3059 if (Redecl->isInlineSpecified() &&
3060 Redecl->getStorageClass() != SC_Extern)
3067 // The rest of this function is C-only.
3068 assert(!Context.getLangOpts().CPlusPlus &&
3069 "should not use C inline rules in C++");
3072 // [...] If all of the file scope declarations for a function in a
3073 // translation unit include the inline function specifier without extern,
3074 // then the definition in that translation unit is an inline definition.
3075 for (auto Redecl : redecls()) {
3076 if (RedeclForcesDefC99(Redecl))
3081 // An inline definition does not provide an external definition for the
3082 // function, and does not forbid an external definition in another
3083 // translation unit.
3087 /// getOverloadedOperator - Which C++ overloaded operator this
3088 /// function represents, if any.
3089 OverloadedOperatorKind FunctionDecl::getOverloadedOperator() const {
3090 if (getDeclName().getNameKind() == DeclarationName::CXXOperatorName)
3091 return getDeclName().getCXXOverloadedOperator();
3096 /// getLiteralIdentifier - The literal suffix identifier this function
3097 /// represents, if any.
3098 const IdentifierInfo *FunctionDecl::getLiteralIdentifier() const {
3099 if (getDeclName().getNameKind() == DeclarationName::CXXLiteralOperatorName)
3100 return getDeclName().getCXXLiteralIdentifier();
3105 FunctionDecl::TemplatedKind FunctionDecl::getTemplatedKind() const {
3106 if (TemplateOrSpecialization.isNull())
3107 return TK_NonTemplate;
3108 if (TemplateOrSpecialization.is<FunctionTemplateDecl *>())
3109 return TK_FunctionTemplate;
3110 if (TemplateOrSpecialization.is<MemberSpecializationInfo *>())
3111 return TK_MemberSpecialization;
3112 if (TemplateOrSpecialization.is<FunctionTemplateSpecializationInfo *>())
3113 return TK_FunctionTemplateSpecialization;
3114 if (TemplateOrSpecialization.is
3115 <DependentFunctionTemplateSpecializationInfo*>())
3116 return TK_DependentFunctionTemplateSpecialization;
3118 llvm_unreachable("Did we miss a TemplateOrSpecialization type?");
3121 FunctionDecl *FunctionDecl::getInstantiatedFromMemberFunction() const {
3122 if (MemberSpecializationInfo *Info = getMemberSpecializationInfo())
3123 return cast<FunctionDecl>(Info->getInstantiatedFrom());
3128 MemberSpecializationInfo *FunctionDecl::getMemberSpecializationInfo() const {
3129 return TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>();
3133 FunctionDecl::setInstantiationOfMemberFunction(ASTContext &C,
3135 TemplateSpecializationKind TSK) {
3136 assert(TemplateOrSpecialization.isNull() &&
3137 "Member function is already a specialization");
3138 MemberSpecializationInfo *Info
3139 = new (C) MemberSpecializationInfo(FD, TSK);
3140 TemplateOrSpecialization = Info;
3143 FunctionTemplateDecl *FunctionDecl::getDescribedFunctionTemplate() const {
3144 return TemplateOrSpecialization.dyn_cast<FunctionTemplateDecl *>();
3147 void FunctionDecl::setDescribedFunctionTemplate(FunctionTemplateDecl *Template) {
3148 TemplateOrSpecialization = Template;
3151 bool FunctionDecl::isImplicitlyInstantiable() const {
3152 // If the function is invalid, it can't be implicitly instantiated.
3153 if (isInvalidDecl())
3156 switch (getTemplateSpecializationKind()) {
3157 case TSK_Undeclared:
3158 case TSK_ExplicitInstantiationDefinition:
3161 case TSK_ImplicitInstantiation:
3164 // It is possible to instantiate TSK_ExplicitSpecialization kind
3165 // if the FunctionDecl has a class scope specialization pattern.
3166 case TSK_ExplicitSpecialization:
3167 return getClassScopeSpecializationPattern() != nullptr;
3169 case TSK_ExplicitInstantiationDeclaration:
3174 // Find the actual template from which we will instantiate.
3175 const FunctionDecl *PatternDecl = getTemplateInstantiationPattern();
3176 bool HasPattern = false;
3178 HasPattern = PatternDecl->hasBody(PatternDecl);
3180 // C++0x [temp.explicit]p9:
3181 // Except for inline functions, other explicit instantiation declarations
3182 // have the effect of suppressing the implicit instantiation of the entity
3183 // to which they refer.
3184 if (!HasPattern || !PatternDecl)
3187 return PatternDecl->isInlined();
3190 bool FunctionDecl::isTemplateInstantiation() const {
3191 switch (getTemplateSpecializationKind()) {
3192 case TSK_Undeclared:
3193 case TSK_ExplicitSpecialization:
3195 case TSK_ImplicitInstantiation:
3196 case TSK_ExplicitInstantiationDeclaration:
3197 case TSK_ExplicitInstantiationDefinition:
3200 llvm_unreachable("All TSK values handled.");
3203 FunctionDecl *FunctionDecl::getTemplateInstantiationPattern() const {
3204 // Handle class scope explicit specialization special case.
3205 if (getTemplateSpecializationKind() == TSK_ExplicitSpecialization)
3206 return getClassScopeSpecializationPattern();
3208 // If this is a generic lambda call operator specialization, its
3209 // instantiation pattern is always its primary template's pattern
3210 // even if its primary template was instantiated from another
3211 // member template (which happens with nested generic lambdas).
3212 // Since a lambda's call operator's body is transformed eagerly,
3213 // we don't have to go hunting for a prototype definition template
3214 // (i.e. instantiated-from-member-template) to use as an instantiation
3217 if (isGenericLambdaCallOperatorSpecialization(
3218 dyn_cast<CXXMethodDecl>(this))) {
3219 assert(getPrimaryTemplate() && "A generic lambda specialization must be "
3220 "generated from a primary call operator "
3222 assert(getPrimaryTemplate()->getTemplatedDecl()->getBody() &&
3223 "A generic lambda call operator template must always have a body - "
3224 "even if instantiated from a prototype (i.e. as written) member "
3226 return getPrimaryTemplate()->getTemplatedDecl();
3229 if (FunctionTemplateDecl *Primary = getPrimaryTemplate()) {
3230 while (Primary->getInstantiatedFromMemberTemplate()) {
3231 // If we have hit a point where the user provided a specialization of
3232 // this template, we're done looking.
3233 if (Primary->isMemberSpecialization())
3235 Primary = Primary->getInstantiatedFromMemberTemplate();
3238 return Primary->getTemplatedDecl();
3241 return getInstantiatedFromMemberFunction();
3244 FunctionTemplateDecl *FunctionDecl::getPrimaryTemplate() const {
3245 if (FunctionTemplateSpecializationInfo *Info
3246 = TemplateOrSpecialization
3247 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3248 return Info->Template.getPointer();
3253 FunctionDecl *FunctionDecl::getClassScopeSpecializationPattern() const {
3254 return getASTContext().getClassScopeSpecializationPattern(this);
3257 FunctionTemplateSpecializationInfo *
3258 FunctionDecl::getTemplateSpecializationInfo() const {
3259 return TemplateOrSpecialization
3260 .dyn_cast<FunctionTemplateSpecializationInfo *>();
3263 const TemplateArgumentList *
3264 FunctionDecl::getTemplateSpecializationArgs() const {
3265 if (FunctionTemplateSpecializationInfo *Info
3266 = TemplateOrSpecialization
3267 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3268 return Info->TemplateArguments;
3273 const ASTTemplateArgumentListInfo *
3274 FunctionDecl::getTemplateSpecializationArgsAsWritten() const {
3275 if (FunctionTemplateSpecializationInfo *Info
3276 = TemplateOrSpecialization
3277 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3278 return Info->TemplateArgumentsAsWritten;
3284 FunctionDecl::setFunctionTemplateSpecialization(ASTContext &C,
3285 FunctionTemplateDecl *Template,
3286 const TemplateArgumentList *TemplateArgs,
3288 TemplateSpecializationKind TSK,
3289 const TemplateArgumentListInfo *TemplateArgsAsWritten,
3290 SourceLocation PointOfInstantiation) {
3291 assert(TSK != TSK_Undeclared &&
3292 "Must specify the type of function template specialization");
3293 FunctionTemplateSpecializationInfo *Info
3294 = TemplateOrSpecialization.dyn_cast<FunctionTemplateSpecializationInfo*>();
3296 Info = FunctionTemplateSpecializationInfo::Create(C, this, Template, TSK,
3298 TemplateArgsAsWritten,
3299 PointOfInstantiation);
3300 TemplateOrSpecialization = Info;
3301 Template->addSpecialization(Info, InsertPos);
3305 FunctionDecl::setDependentTemplateSpecialization(ASTContext &Context,
3306 const UnresolvedSetImpl &Templates,
3307 const TemplateArgumentListInfo &TemplateArgs) {
3308 assert(TemplateOrSpecialization.isNull());
3309 DependentFunctionTemplateSpecializationInfo *Info =
3310 DependentFunctionTemplateSpecializationInfo::Create(Context, Templates,
3312 TemplateOrSpecialization = Info;
3315 DependentFunctionTemplateSpecializationInfo *
3316 FunctionDecl::getDependentSpecializationInfo() const {
3317 return TemplateOrSpecialization
3318 .dyn_cast<DependentFunctionTemplateSpecializationInfo *>();
3321 DependentFunctionTemplateSpecializationInfo *
3322 DependentFunctionTemplateSpecializationInfo::Create(
3323 ASTContext &Context, const UnresolvedSetImpl &Ts,
3324 const TemplateArgumentListInfo &TArgs) {
3325 void *Buffer = Context.Allocate(
3326 totalSizeToAlloc<TemplateArgumentLoc, FunctionTemplateDecl *>(
3327 TArgs.size(), Ts.size()));
3328 return new (Buffer) DependentFunctionTemplateSpecializationInfo(Ts, TArgs);
3331 DependentFunctionTemplateSpecializationInfo::
3332 DependentFunctionTemplateSpecializationInfo(const UnresolvedSetImpl &Ts,
3333 const TemplateArgumentListInfo &TArgs)
3334 : AngleLocs(TArgs.getLAngleLoc(), TArgs.getRAngleLoc()) {
3336 NumTemplates = Ts.size();
3337 NumArgs = TArgs.size();
3339 FunctionTemplateDecl **TsArray = getTrailingObjects<FunctionTemplateDecl *>();
3340 for (unsigned I = 0, E = Ts.size(); I != E; ++I)
3341 TsArray[I] = cast<FunctionTemplateDecl>(Ts[I]->getUnderlyingDecl());
3343 TemplateArgumentLoc *ArgsArray = getTrailingObjects<TemplateArgumentLoc>();
3344 for (unsigned I = 0, E = TArgs.size(); I != E; ++I)
3345 new (&ArgsArray[I]) TemplateArgumentLoc(TArgs[I]);
3348 TemplateSpecializationKind FunctionDecl::getTemplateSpecializationKind() const {
3349 // For a function template specialization, query the specialization
3350 // information object.
3351 FunctionTemplateSpecializationInfo *FTSInfo
3352 = TemplateOrSpecialization.dyn_cast<FunctionTemplateSpecializationInfo*>();
3354 return FTSInfo->getTemplateSpecializationKind();
3356 MemberSpecializationInfo *MSInfo
3357 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>();
3359 return MSInfo->getTemplateSpecializationKind();
3361 return TSK_Undeclared;
3365 FunctionDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
3366 SourceLocation PointOfInstantiation) {
3367 if (FunctionTemplateSpecializationInfo *FTSInfo
3368 = TemplateOrSpecialization.dyn_cast<
3369 FunctionTemplateSpecializationInfo*>()) {
3370 FTSInfo->setTemplateSpecializationKind(TSK);
3371 if (TSK != TSK_ExplicitSpecialization &&
3372 PointOfInstantiation.isValid() &&
3373 FTSInfo->getPointOfInstantiation().isInvalid())
3374 FTSInfo->setPointOfInstantiation(PointOfInstantiation);
3375 } else if (MemberSpecializationInfo *MSInfo
3376 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>()) {
3377 MSInfo->setTemplateSpecializationKind(TSK);
3378 if (TSK != TSK_ExplicitSpecialization &&
3379 PointOfInstantiation.isValid() &&
3380 MSInfo->getPointOfInstantiation().isInvalid())
3381 MSInfo->setPointOfInstantiation(PointOfInstantiation);
3383 llvm_unreachable("Function cannot have a template specialization kind");
3386 SourceLocation FunctionDecl::getPointOfInstantiation() const {
3387 if (FunctionTemplateSpecializationInfo *FTSInfo
3388 = TemplateOrSpecialization.dyn_cast<
3389 FunctionTemplateSpecializationInfo*>())
3390 return FTSInfo->getPointOfInstantiation();
3391 else if (MemberSpecializationInfo *MSInfo
3392 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>())
3393 return MSInfo->getPointOfInstantiation();
3395 return SourceLocation();
3398 bool FunctionDecl::isOutOfLine() const {
3399 if (Decl::isOutOfLine())
3402 // If this function was instantiated from a member function of a
3403 // class template, check whether that member function was defined out-of-line.
3404 if (FunctionDecl *FD = getInstantiatedFromMemberFunction()) {
3405 const FunctionDecl *Definition;
3406 if (FD->hasBody(Definition))
3407 return Definition->isOutOfLine();
3410 // If this function was instantiated from a function template,
3411 // check whether that function template was defined out-of-line.
3412 if (FunctionTemplateDecl *FunTmpl = getPrimaryTemplate()) {
3413 const FunctionDecl *Definition;
3414 if (FunTmpl->getTemplatedDecl()->hasBody(Definition))
3415 return Definition->isOutOfLine();
3421 SourceRange FunctionDecl::getSourceRange() const {
3422 return SourceRange(getOuterLocStart(), EndRangeLoc);
3425 unsigned FunctionDecl::getMemoryFunctionKind() const {
3426 IdentifierInfo *FnInfo = getIdentifier();
3431 // Builtin handling.
3432 switch (getBuiltinID()) {
3433 case Builtin::BI__builtin_memset:
3434 case Builtin::BI__builtin___memset_chk:
3435 case Builtin::BImemset:
3436 return Builtin::BImemset;
3438 case Builtin::BI__builtin_memcpy:
3439 case Builtin::BI__builtin___memcpy_chk:
3440 case Builtin::BImemcpy:
3441 return Builtin::BImemcpy;
3443 case Builtin::BI__builtin_memmove:
3444 case Builtin::BI__builtin___memmove_chk:
3445 case Builtin::BImemmove:
3446 return Builtin::BImemmove;
3448 case Builtin::BIstrlcpy:
3449 case Builtin::BI__builtin___strlcpy_chk:
3450 return Builtin::BIstrlcpy;
3452 case Builtin::BIstrlcat:
3453 case Builtin::BI__builtin___strlcat_chk:
3454 return Builtin::BIstrlcat;
3456 case Builtin::BI__builtin_memcmp:
3457 case Builtin::BImemcmp:
3458 return Builtin::BImemcmp;
3460 case Builtin::BI__builtin_strncpy:
3461 case Builtin::BI__builtin___strncpy_chk:
3462 case Builtin::BIstrncpy:
3463 return Builtin::BIstrncpy;
3465 case Builtin::BI__builtin_strncmp:
3466 case Builtin::BIstrncmp:
3467 return Builtin::BIstrncmp;
3469 case Builtin::BI__builtin_strncasecmp:
3470 case Builtin::BIstrncasecmp:
3471 return Builtin::BIstrncasecmp;
3473 case Builtin::BI__builtin_strncat:
3474 case Builtin::BI__builtin___strncat_chk:
3475 case Builtin::BIstrncat:
3476 return Builtin::BIstrncat;
3478 case Builtin::BI__builtin_strndup:
3479 case Builtin::BIstrndup:
3480 return Builtin::BIstrndup;
3482 case Builtin::BI__builtin_strlen:
3483 case Builtin::BIstrlen:
3484 return Builtin::BIstrlen;
3486 case Builtin::BI__builtin_bzero:
3487 case Builtin::BIbzero:
3488 return Builtin::BIbzero;
3492 if (FnInfo->isStr("memset"))
3493 return Builtin::BImemset;
3494 else if (FnInfo->isStr("memcpy"))
3495 return Builtin::BImemcpy;
3496 else if (FnInfo->isStr("memmove"))
3497 return Builtin::BImemmove;
3498 else if (FnInfo->isStr("memcmp"))
3499 return Builtin::BImemcmp;
3500 else if (FnInfo->isStr("strncpy"))
3501 return Builtin::BIstrncpy;
3502 else if (FnInfo->isStr("strncmp"))
3503 return Builtin::BIstrncmp;
3504 else if (FnInfo->isStr("strncasecmp"))
3505 return Builtin::BIstrncasecmp;
3506 else if (FnInfo->isStr("strncat"))
3507 return Builtin::BIstrncat;
3508 else if (FnInfo->isStr("strndup"))
3509 return Builtin::BIstrndup;
3510 else if (FnInfo->isStr("strlen"))
3511 return Builtin::BIstrlen;
3512 else if (FnInfo->isStr("bzero"))
3513 return Builtin::BIbzero;
3520 //===----------------------------------------------------------------------===//
3521 // FieldDecl Implementation
3522 //===----------------------------------------------------------------------===//
3524 FieldDecl *FieldDecl::Create(const ASTContext &C, DeclContext *DC,
3525 SourceLocation StartLoc, SourceLocation IdLoc,
3526 IdentifierInfo *Id, QualType T,
3527 TypeSourceInfo *TInfo, Expr *BW, bool Mutable,
3528 InClassInitStyle InitStyle) {
3529 return new (C, DC) FieldDecl(Decl::Field, DC, StartLoc, IdLoc, Id, T, TInfo,
3530 BW, Mutable, InitStyle);
3533 FieldDecl *FieldDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
3534 return new (C, ID) FieldDecl(Field, nullptr, SourceLocation(),
3535 SourceLocation(), nullptr, QualType(), nullptr,
3536 nullptr, false, ICIS_NoInit);
3539 bool FieldDecl::isAnonymousStructOrUnion() const {
3540 if (!isImplicit() || getDeclName())
3543 if (const auto *Record = getType()->getAs<RecordType>())
3544 return Record->getDecl()->isAnonymousStructOrUnion();
3549 unsigned FieldDecl::getBitWidthValue(const ASTContext &Ctx) const {
3550 assert(isBitField() && "not a bitfield");
3551 auto *BitWidth = static_cast<Expr *>(InitStorage.getPointer());
3552 return BitWidth->EvaluateKnownConstInt(Ctx).getZExtValue();
3555 unsigned FieldDecl::getFieldIndex() const {
3556 const FieldDecl *Canonical = getCanonicalDecl();
3557 if (Canonical != this)
3558 return Canonical->getFieldIndex();
3560 if (CachedFieldIndex) return CachedFieldIndex - 1;
3563 const RecordDecl *RD = getParent();
3565 for (auto *Field : RD->fields()) {
3566 Field->getCanonicalDecl()->CachedFieldIndex = Index + 1;
3570 assert(CachedFieldIndex && "failed to find field in parent");
3571 return CachedFieldIndex - 1;
3574 SourceRange FieldDecl::getSourceRange() const {
3575 switch (InitStorage.getInt()) {
3576 // All three of these cases store an optional Expr*.
3577 case ISK_BitWidthOrNothing:
3578 case ISK_InClassCopyInit:
3579 case ISK_InClassListInit:
3580 if (const auto *E = static_cast<const Expr *>(InitStorage.getPointer()))
3581 return SourceRange(getInnerLocStart(), E->getLocEnd());
3584 case ISK_CapturedVLAType:
3585 return DeclaratorDecl::getSourceRange();
3587 llvm_unreachable("bad init storage kind");
3590 void FieldDecl::setCapturedVLAType(const VariableArrayType *VLAType) {
3591 assert((getParent()->isLambda() || getParent()->isCapturedRecord()) &&
3592 "capturing type in non-lambda or captured record.");
3593 assert(InitStorage.getInt() == ISK_BitWidthOrNothing &&
3594 InitStorage.getPointer() == nullptr &&
3595 "bit width, initializer or captured type already set");
3596 InitStorage.setPointerAndInt(const_cast<VariableArrayType *>(VLAType),
3597 ISK_CapturedVLAType);
3600 //===----------------------------------------------------------------------===//
3601 // TagDecl Implementation
3602 //===----------------------------------------------------------------------===//
3604 SourceLocation TagDecl::getOuterLocStart() const {
3605 return getTemplateOrInnerLocStart(this);
3608 SourceRange TagDecl::getSourceRange() const {
3609 SourceLocation RBraceLoc = BraceRange.getEnd();
3610 SourceLocation E = RBraceLoc.isValid() ? RBraceLoc : getLocation();
3611 return SourceRange(getOuterLocStart(), E);
3614 TagDecl *TagDecl::getCanonicalDecl() { return getFirstDecl(); }
3616 void TagDecl::setTypedefNameForAnonDecl(TypedefNameDecl *TDD) {
3617 TypedefNameDeclOrQualifier = TDD;
3618 if (const Type *T = getTypeForDecl()) {
3620 assert(T->isLinkageValid());
3622 assert(isLinkageValid());
3625 void TagDecl::startDefinition() {
3626 IsBeingDefined = true;
3628 if (auto *D = dyn_cast<CXXRecordDecl>(this)) {
3629 struct CXXRecordDecl::DefinitionData *Data =
3630 new (getASTContext()) struct CXXRecordDecl::DefinitionData(D);
3631 for (auto I : redecls())
3632 cast<CXXRecordDecl>(I)->DefinitionData = Data;
3636 void TagDecl::completeDefinition() {
3637 assert((!isa<CXXRecordDecl>(this) ||
3638 cast<CXXRecordDecl>(this)->hasDefinition()) &&
3639 "definition completed but not started");
3641 IsCompleteDefinition = true;
3642 IsBeingDefined = false;
3644 if (ASTMutationListener *L = getASTMutationListener())
3645 L->CompletedTagDefinition(this);
3648 TagDecl *TagDecl::getDefinition() const {
3649 if (isCompleteDefinition())
3650 return const_cast<TagDecl *>(this);
3652 // If it's possible for us to have an out-of-date definition, check now.
3653 if (MayHaveOutOfDateDef) {
3654 if (IdentifierInfo *II = getIdentifier()) {
3655 if (II->isOutOfDate()) {
3656 updateOutOfDate(*II);
3661 if (const auto *CXXRD = dyn_cast<CXXRecordDecl>(this))
3662 return CXXRD->getDefinition();
3664 for (auto R : redecls())
3665 if (R->isCompleteDefinition())
3671 void TagDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) {
3673 // Make sure the extended qualifier info is allocated.
3675 TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo;
3676 // Set qualifier info.
3677 getExtInfo()->QualifierLoc = QualifierLoc;
3679 // Here Qualifier == 0, i.e., we are removing the qualifier (if any).
3681 if (getExtInfo()->NumTemplParamLists == 0) {
3682 getASTContext().Deallocate(getExtInfo());
3683 TypedefNameDeclOrQualifier = (TypedefNameDecl *)nullptr;
3686 getExtInfo()->QualifierLoc = QualifierLoc;
3691 void TagDecl::setTemplateParameterListsInfo(
3692 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
3693 assert(!TPLists.empty());
3694 // Make sure the extended decl info is allocated.
3696 // Allocate external info struct.
3697 TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo;
3698 // Set the template parameter lists info.
3699 getExtInfo()->setTemplateParameterListsInfo(Context, TPLists);
3702 //===----------------------------------------------------------------------===//
3703 // EnumDecl Implementation
3704 //===----------------------------------------------------------------------===//
3706 void EnumDecl::anchor() { }
3708 EnumDecl *EnumDecl::Create(ASTContext &C, DeclContext *DC,
3709 SourceLocation StartLoc, SourceLocation IdLoc,
3711 EnumDecl *PrevDecl, bool IsScoped,
3712 bool IsScopedUsingClassTag, bool IsFixed) {
3713 auto *Enum = new (C, DC) EnumDecl(C, DC, StartLoc, IdLoc, Id, PrevDecl,
3714 IsScoped, IsScopedUsingClassTag, IsFixed);
3715 Enum->MayHaveOutOfDateDef = C.getLangOpts().Modules;
3716 C.getTypeDeclType(Enum, PrevDecl);
3720 EnumDecl *EnumDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
3722 new (C, ID) EnumDecl(C, nullptr, SourceLocation(), SourceLocation(),
3723 nullptr, nullptr, false, false, false);
3724 Enum->MayHaveOutOfDateDef = C.getLangOpts().Modules;
3728 SourceRange EnumDecl::getIntegerTypeRange() const {
3729 if (const TypeSourceInfo *TI = getIntegerTypeSourceInfo())
3730 return TI->getTypeLoc().getSourceRange();
3731 return SourceRange();
3734 void EnumDecl::completeDefinition(QualType NewType,
3735 QualType NewPromotionType,
3736 unsigned NumPositiveBits,
3737 unsigned NumNegativeBits) {
3738 assert(!isCompleteDefinition() && "Cannot redefine enums!");
3740 IntegerType = NewType.getTypePtr();
3741 PromotionType = NewPromotionType;
3742 setNumPositiveBits(NumPositiveBits);
3743 setNumNegativeBits(NumNegativeBits);
3744 TagDecl::completeDefinition();
3747 TemplateSpecializationKind EnumDecl::getTemplateSpecializationKind() const {
3748 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
3749 return MSI->getTemplateSpecializationKind();
3751 return TSK_Undeclared;
3754 void EnumDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
3755 SourceLocation PointOfInstantiation) {
3756 MemberSpecializationInfo *MSI = getMemberSpecializationInfo();
3757 assert(MSI && "Not an instantiated member enumeration?");
3758 MSI->setTemplateSpecializationKind(TSK);
3759 if (TSK != TSK_ExplicitSpecialization &&
3760 PointOfInstantiation.isValid() &&
3761 MSI->getPointOfInstantiation().isInvalid())
3762 MSI->setPointOfInstantiation(PointOfInstantiation);
3765 EnumDecl *EnumDecl::getTemplateInstantiationPattern() const {
3766 if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo()) {
3767 if (isTemplateInstantiation(MSInfo->getTemplateSpecializationKind())) {
3768 EnumDecl *ED = getInstantiatedFromMemberEnum();
3769 while (auto *NewED = ED->getInstantiatedFromMemberEnum())
3775 assert(!isTemplateInstantiation(getTemplateSpecializationKind()) &&
3776 "couldn't find pattern for enum instantiation");
3780 EnumDecl *EnumDecl::getInstantiatedFromMemberEnum() const {
3781 if (SpecializationInfo)
3782 return cast<EnumDecl>(SpecializationInfo->getInstantiatedFrom());
3787 void EnumDecl::setInstantiationOfMemberEnum(ASTContext &C, EnumDecl *ED,
3788 TemplateSpecializationKind TSK) {
3789 assert(!SpecializationInfo && "Member enum is already a specialization");
3790 SpecializationInfo = new (C) MemberSpecializationInfo(ED, TSK);
3793 //===----------------------------------------------------------------------===//
3794 // RecordDecl Implementation
3795 //===----------------------------------------------------------------------===//
3797 RecordDecl::RecordDecl(Kind DK, TagKind TK, const ASTContext &C,
3798 DeclContext *DC, SourceLocation StartLoc,
3799 SourceLocation IdLoc, IdentifierInfo *Id,
3800 RecordDecl *PrevDecl)
3801 : TagDecl(DK, TK, C, DC, IdLoc, Id, PrevDecl, StartLoc) {
3802 HasFlexibleArrayMember = false;
3803 AnonymousStructOrUnion = false;
3804 HasObjectMember = false;
3805 HasVolatileMember = false;
3806 LoadedFieldsFromExternalStorage = false;
3807 assert(classof(static_cast<Decl*>(this)) && "Invalid Kind!");
3810 RecordDecl *RecordDecl::Create(const ASTContext &C, TagKind TK, DeclContext *DC,
3811 SourceLocation StartLoc, SourceLocation IdLoc,
3812 IdentifierInfo *Id, RecordDecl* PrevDecl) {
3813 RecordDecl *R = new (C, DC) RecordDecl(Record, TK, C, DC,
3814 StartLoc, IdLoc, Id, PrevDecl);
3815 R->MayHaveOutOfDateDef = C.getLangOpts().Modules;
3817 C.getTypeDeclType(R, PrevDecl);
3821 RecordDecl *RecordDecl::CreateDeserialized(const ASTContext &C, unsigned ID) {
3823 new (C, ID) RecordDecl(Record, TTK_Struct, C, nullptr, SourceLocation(),
3824 SourceLocation(), nullptr, nullptr);
3825 R->MayHaveOutOfDateDef = C.getLangOpts().Modules;
3829 bool RecordDecl::isInjectedClassName() const {
3830 return isImplicit() && getDeclName() && getDeclContext()->isRecord() &&
3831 cast<RecordDecl>(getDeclContext())->getDeclName() == getDeclName();
3834 bool RecordDecl::isLambda() const {
3835 if (auto RD = dyn_cast<CXXRecordDecl>(this))
3836 return RD->isLambda();
3840 bool RecordDecl::isCapturedRecord() const {
3841 return hasAttr<CapturedRecordAttr>();
3844 void RecordDecl::setCapturedRecord() {
3845 addAttr(CapturedRecordAttr::CreateImplicit(getASTContext()));
3848 RecordDecl::field_iterator RecordDecl::field_begin() const {
3849 if (hasExternalLexicalStorage() && !LoadedFieldsFromExternalStorage)
3850 LoadFieldsFromExternalStorage();
3852 return field_iterator(decl_iterator(FirstDecl));
3855 /// completeDefinition - Notes that the definition of this type is now
3857 void RecordDecl::completeDefinition() {
3858 assert(!isCompleteDefinition() && "Cannot redefine record!");
3859 TagDecl::completeDefinition();
3862 /// isMsStruct - Get whether or not this record uses ms_struct layout.
3863 /// This which can be turned on with an attribute, pragma, or the
3864 /// -mms-bitfields command-line option.
3865 bool RecordDecl::isMsStruct(const ASTContext &C) const {
3866 return hasAttr<MSStructAttr>() || C.getLangOpts().MSBitfields == 1;
3869 void RecordDecl::LoadFieldsFromExternalStorage() const {
3870 ExternalASTSource *Source = getASTContext().getExternalSource();
3871 assert(hasExternalLexicalStorage() && Source && "No external storage?");
3873 // Notify that we have a RecordDecl doing some initialization.
3874 ExternalASTSource::Deserializing TheFields(Source);
3876 SmallVector<Decl*, 64> Decls;
3877 LoadedFieldsFromExternalStorage = true;
3878 Source->FindExternalLexicalDecls(this, [](Decl::Kind K) {
3879 return FieldDecl::classofKind(K) || IndirectFieldDecl::classofKind(K);
3883 // Check that all decls we got were FieldDecls.
3884 for (unsigned i=0, e=Decls.size(); i != e; ++i)
3885 assert(isa<FieldDecl>(Decls[i]) || isa<IndirectFieldDecl>(Decls[i]));
3891 std::tie(FirstDecl, LastDecl) = BuildDeclChain(Decls,
3892 /*FieldsAlreadyLoaded=*/false);
3895 bool RecordDecl::mayInsertExtraPadding(bool EmitRemark) const {
3896 ASTContext &Context = getASTContext();
3897 if (!Context.getLangOpts().Sanitize.hasOneOf(
3898 SanitizerKind::Address | SanitizerKind::KernelAddress) ||
3899 !Context.getLangOpts().SanitizeAddressFieldPadding)
3901 const auto &Blacklist = Context.getSanitizerBlacklist();
3902 const auto *CXXRD = dyn_cast<CXXRecordDecl>(this);
3903 // We may be able to relax some of these requirements.
3904 int ReasonToReject = -1;
3905 if (!CXXRD || CXXRD->isExternCContext())
3906 ReasonToReject = 0; // is not C++.
3907 else if (CXXRD->hasAttr<PackedAttr>())
3908 ReasonToReject = 1; // is packed.
3909 else if (CXXRD->isUnion())
3910 ReasonToReject = 2; // is a union.
3911 else if (CXXRD->isTriviallyCopyable())
3912 ReasonToReject = 3; // is trivially copyable.
3913 else if (CXXRD->hasTrivialDestructor())
3914 ReasonToReject = 4; // has trivial destructor.
3915 else if (CXXRD->isStandardLayout())
3916 ReasonToReject = 5; // is standard layout.
3917 else if (Blacklist.isBlacklistedLocation(getLocation(), "field-padding"))
3918 ReasonToReject = 6; // is in a blacklisted file.
3919 else if (Blacklist.isBlacklistedType(getQualifiedNameAsString(),
3921 ReasonToReject = 7; // is blacklisted.
3924 if (ReasonToReject >= 0)
3925 Context.getDiagnostics().Report(
3927 diag::remark_sanitize_address_insert_extra_padding_rejected)
3928 << getQualifiedNameAsString() << ReasonToReject;
3930 Context.getDiagnostics().Report(
3932 diag::remark_sanitize_address_insert_extra_padding_accepted)
3933 << getQualifiedNameAsString();
3935 return ReasonToReject < 0;
3938 const FieldDecl *RecordDecl::findFirstNamedDataMember() const {
3939 for (const auto *I : fields()) {
3940 if (I->getIdentifier())
3943 if (const auto *RT = I->getType()->getAs<RecordType>())
3944 if (const FieldDecl *NamedDataMember =
3945 RT->getDecl()->findFirstNamedDataMember())
3946 return NamedDataMember;
3949 // We didn't find a named data member.
3954 //===----------------------------------------------------------------------===//
3955 // BlockDecl Implementation
3956 //===----------------------------------------------------------------------===//
3958 void BlockDecl::setParams(ArrayRef<ParmVarDecl *> NewParamInfo) {
3959 assert(!ParamInfo && "Already has param info!");
3961 // Zero params -> null pointer.
3962 if (!NewParamInfo.empty()) {
3963 NumParams = NewParamInfo.size();
3964 ParamInfo = new (getASTContext()) ParmVarDecl*[NewParamInfo.size()];
3965 std::copy(NewParamInfo.begin(), NewParamInfo.end(), ParamInfo);
3969 void BlockDecl::setCaptures(ASTContext &Context, ArrayRef<Capture> Captures,
3970 bool CapturesCXXThis) {
3971 this->CapturesCXXThis = CapturesCXXThis;
3972 this->NumCaptures = Captures.size();
3974 if (Captures.empty()) {
3975 this->Captures = nullptr;
3979 this->Captures = Captures.copy(Context).data();
3982 bool BlockDecl::capturesVariable(const VarDecl *variable) const {
3983 for (const auto &I : captures())
3984 // Only auto vars can be captured, so no redeclaration worries.
3985 if (I.getVariable() == variable)
3991 SourceRange BlockDecl::getSourceRange() const {
3992 return SourceRange(getLocation(), Body? Body->getLocEnd() : getLocation());
3995 //===----------------------------------------------------------------------===//
3996 // Other Decl Allocation/Deallocation Method Implementations
3997 //===----------------------------------------------------------------------===//
3999 void TranslationUnitDecl::anchor() { }
4001 TranslationUnitDecl *TranslationUnitDecl::Create(ASTContext &C) {
4002 return new (C, (DeclContext *)nullptr) TranslationUnitDecl(C);
4005 void PragmaCommentDecl::anchor() { }
4007 PragmaCommentDecl *PragmaCommentDecl::Create(const ASTContext &C,
4008 TranslationUnitDecl *DC,
4009 SourceLocation CommentLoc,
4010 PragmaMSCommentKind CommentKind,
4012 PragmaCommentDecl *PCD =
4013 new (C, DC, additionalSizeToAlloc<char>(Arg.size() + 1))
4014 PragmaCommentDecl(DC, CommentLoc, CommentKind);
4015 memcpy(PCD->getTrailingObjects<char>(), Arg.data(), Arg.size());
4016 PCD->getTrailingObjects<char>()[Arg.size()] = '\0';
4020 PragmaCommentDecl *PragmaCommentDecl::CreateDeserialized(ASTContext &C,
4023 return new (C, ID, additionalSizeToAlloc<char>(ArgSize + 1))
4024 PragmaCommentDecl(nullptr, SourceLocation(), PCK_Unknown);
4027 void PragmaDetectMismatchDecl::anchor() { }
4029 PragmaDetectMismatchDecl *
4030 PragmaDetectMismatchDecl::Create(const ASTContext &C, TranslationUnitDecl *DC,
4031 SourceLocation Loc, StringRef Name,
4033 size_t ValueStart = Name.size() + 1;
4034 PragmaDetectMismatchDecl *PDMD =
4035 new (C, DC, additionalSizeToAlloc<char>(ValueStart + Value.size() + 1))
4036 PragmaDetectMismatchDecl(DC, Loc, ValueStart);
4037 memcpy(PDMD->getTrailingObjects<char>(), Name.data(), Name.size());
4038 PDMD->getTrailingObjects<char>()[Name.size()] = '\0';
4039 memcpy(PDMD->getTrailingObjects<char>() + ValueStart, Value.data(),
4041 PDMD->getTrailingObjects<char>()[ValueStart + Value.size()] = '\0';
4045 PragmaDetectMismatchDecl *
4046 PragmaDetectMismatchDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4047 unsigned NameValueSize) {
4048 return new (C, ID, additionalSizeToAlloc<char>(NameValueSize + 1))
4049 PragmaDetectMismatchDecl(nullptr, SourceLocation(), 0);
4052 void ExternCContextDecl::anchor() { }
4054 ExternCContextDecl *ExternCContextDecl::Create(const ASTContext &C,
4055 TranslationUnitDecl *DC) {
4056 return new (C, DC) ExternCContextDecl(DC);
4059 void LabelDecl::anchor() { }
4061 LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC,
4062 SourceLocation IdentL, IdentifierInfo *II) {
4063 return new (C, DC) LabelDecl(DC, IdentL, II, nullptr, IdentL);
4066 LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC,
4067 SourceLocation IdentL, IdentifierInfo *II,
4068 SourceLocation GnuLabelL) {
4069 assert(GnuLabelL != IdentL && "Use this only for GNU local labels");
4070 return new (C, DC) LabelDecl(DC, IdentL, II, nullptr, GnuLabelL);
4073 LabelDecl *LabelDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4074 return new (C, ID) LabelDecl(nullptr, SourceLocation(), nullptr, nullptr,
4078 void LabelDecl::setMSAsmLabel(StringRef Name) {
4079 char *Buffer = new (getASTContext(), 1) char[Name.size() + 1];
4080 memcpy(Buffer, Name.data(), Name.size());
4081 Buffer[Name.size()] = '\0';
4085 void ValueDecl::anchor() { }
4087 bool ValueDecl::isWeak() const {
4088 for (const auto *I : attrs())
4089 if (isa<WeakAttr>(I) || isa<WeakRefAttr>(I))
4092 return isWeakImported();
4095 void ImplicitParamDecl::anchor() { }
4097 ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, DeclContext *DC,
4098 SourceLocation IdLoc,
4101 return new (C, DC) ImplicitParamDecl(C, DC, IdLoc, Id, Type);
4104 ImplicitParamDecl *ImplicitParamDecl::CreateDeserialized(ASTContext &C,
4106 return new (C, ID) ImplicitParamDecl(C, nullptr, SourceLocation(), nullptr,
4110 FunctionDecl *FunctionDecl::Create(ASTContext &C, DeclContext *DC,
4111 SourceLocation StartLoc,
4112 const DeclarationNameInfo &NameInfo,
4113 QualType T, TypeSourceInfo *TInfo,
4115 bool isInlineSpecified,
4116 bool hasWrittenPrototype,
4117 bool isConstexprSpecified) {
4119 new (C, DC) FunctionDecl(Function, C, DC, StartLoc, NameInfo, T, TInfo,
4120 SC, isInlineSpecified, isConstexprSpecified);
4121 New->HasWrittenPrototype = hasWrittenPrototype;
4125 FunctionDecl *FunctionDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4126 return new (C, ID) FunctionDecl(Function, C, nullptr, SourceLocation(),
4127 DeclarationNameInfo(), QualType(), nullptr,
4128 SC_None, false, false);
4131 BlockDecl *BlockDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) {
4132 return new (C, DC) BlockDecl(DC, L);
4135 BlockDecl *BlockDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4136 return new (C, ID) BlockDecl(nullptr, SourceLocation());
4139 CapturedDecl::CapturedDecl(DeclContext *DC, unsigned NumParams)
4140 : Decl(Captured, DC, SourceLocation()), DeclContext(Captured),
4141 NumParams(NumParams), ContextParam(0), BodyAndNothrow(nullptr, false) {}
4143 CapturedDecl *CapturedDecl::Create(ASTContext &C, DeclContext *DC,
4144 unsigned NumParams) {
4145 return new (C, DC, additionalSizeToAlloc<ImplicitParamDecl *>(NumParams))
4146 CapturedDecl(DC, NumParams);
4149 CapturedDecl *CapturedDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4150 unsigned NumParams) {
4151 return new (C, ID, additionalSizeToAlloc<ImplicitParamDecl *>(NumParams))
4152 CapturedDecl(nullptr, NumParams);
4155 Stmt *CapturedDecl::getBody() const { return BodyAndNothrow.getPointer(); }
4156 void CapturedDecl::setBody(Stmt *B) { BodyAndNothrow.setPointer(B); }
4158 bool CapturedDecl::isNothrow() const { return BodyAndNothrow.getInt(); }
4159 void CapturedDecl::setNothrow(bool Nothrow) { BodyAndNothrow.setInt(Nothrow); }
4161 EnumConstantDecl *EnumConstantDecl::Create(ASTContext &C, EnumDecl *CD,
4163 IdentifierInfo *Id, QualType T,
4164 Expr *E, const llvm::APSInt &V) {
4165 return new (C, CD) EnumConstantDecl(CD, L, Id, T, E, V);
4169 EnumConstantDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4170 return new (C, ID) EnumConstantDecl(nullptr, SourceLocation(), nullptr,
4171 QualType(), nullptr, llvm::APSInt());
4174 void IndirectFieldDecl::anchor() { }
4176 IndirectFieldDecl::IndirectFieldDecl(ASTContext &C, DeclContext *DC,
4177 SourceLocation L, DeclarationName N,
4179 MutableArrayRef<NamedDecl *> CH)
4180 : ValueDecl(IndirectField, DC, L, N, T), Chaining(CH.data()),
4181 ChainingSize(CH.size()) {
4182 // In C++, indirect field declarations conflict with tag declarations in the
4183 // same scope, so add them to IDNS_Tag so that tag redeclaration finds them.
4184 if (C.getLangOpts().CPlusPlus)
4185 IdentifierNamespace |= IDNS_Tag;
4189 IndirectFieldDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L,
4190 IdentifierInfo *Id, QualType T,
4191 llvm::MutableArrayRef<NamedDecl *> CH) {
4192 return new (C, DC) IndirectFieldDecl(C, DC, L, Id, T, CH);
4195 IndirectFieldDecl *IndirectFieldDecl::CreateDeserialized(ASTContext &C,
4197 return new (C, ID) IndirectFieldDecl(C, nullptr, SourceLocation(),
4198 DeclarationName(), QualType(), None);
4201 SourceRange EnumConstantDecl::getSourceRange() const {
4202 SourceLocation End = getLocation();
4204 End = Init->getLocEnd();
4205 return SourceRange(getLocation(), End);
4208 void TypeDecl::anchor() { }
4210 TypedefDecl *TypedefDecl::Create(ASTContext &C, DeclContext *DC,
4211 SourceLocation StartLoc, SourceLocation IdLoc,
4212 IdentifierInfo *Id, TypeSourceInfo *TInfo) {
4213 return new (C, DC) TypedefDecl(C, DC, StartLoc, IdLoc, Id, TInfo);
4216 void TypedefNameDecl::anchor() { }
4218 TagDecl *TypedefNameDecl::getAnonDeclWithTypedefName(bool AnyRedecl) const {
4219 if (auto *TT = getTypeSourceInfo()->getType()->getAs<TagType>()) {
4220 auto *OwningTypedef = TT->getDecl()->getTypedefNameForAnonDecl();
4221 auto *ThisTypedef = this;
4222 if (AnyRedecl && OwningTypedef) {
4223 OwningTypedef = OwningTypedef->getCanonicalDecl();
4224 ThisTypedef = ThisTypedef->getCanonicalDecl();
4226 if (OwningTypedef == ThisTypedef)
4227 return TT->getDecl();
4233 TypedefDecl *TypedefDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4234 return new (C, ID) TypedefDecl(C, nullptr, SourceLocation(), SourceLocation(),
4238 TypeAliasDecl *TypeAliasDecl::Create(ASTContext &C, DeclContext *DC,
4239 SourceLocation StartLoc,
4240 SourceLocation IdLoc, IdentifierInfo *Id,
4241 TypeSourceInfo *TInfo) {
4242 return new (C, DC) TypeAliasDecl(C, DC, StartLoc, IdLoc, Id, TInfo);
4245 TypeAliasDecl *TypeAliasDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4246 return new (C, ID) TypeAliasDecl(C, nullptr, SourceLocation(),
4247 SourceLocation(), nullptr, nullptr);
4250 SourceRange TypedefDecl::getSourceRange() const {
4251 SourceLocation RangeEnd = getLocation();
4252 if (TypeSourceInfo *TInfo = getTypeSourceInfo()) {
4253 if (typeIsPostfix(TInfo->getType()))
4254 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
4256 return SourceRange(getLocStart(), RangeEnd);
4259 SourceRange TypeAliasDecl::getSourceRange() const {
4260 SourceLocation RangeEnd = getLocStart();
4261 if (TypeSourceInfo *TInfo = getTypeSourceInfo())
4262 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
4263 return SourceRange(getLocStart(), RangeEnd);
4266 void FileScopeAsmDecl::anchor() { }
4268 FileScopeAsmDecl *FileScopeAsmDecl::Create(ASTContext &C, DeclContext *DC,
4270 SourceLocation AsmLoc,
4271 SourceLocation RParenLoc) {
4272 return new (C, DC) FileScopeAsmDecl(DC, Str, AsmLoc, RParenLoc);
4275 FileScopeAsmDecl *FileScopeAsmDecl::CreateDeserialized(ASTContext &C,
4277 return new (C, ID) FileScopeAsmDecl(nullptr, nullptr, SourceLocation(),
4281 void EmptyDecl::anchor() {}
4283 EmptyDecl *EmptyDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) {
4284 return new (C, DC) EmptyDecl(DC, L);
4287 EmptyDecl *EmptyDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4288 return new (C, ID) EmptyDecl(nullptr, SourceLocation());
4291 //===----------------------------------------------------------------------===//
4292 // ImportDecl Implementation
4293 //===----------------------------------------------------------------------===//
4295 /// \brief Retrieve the number of module identifiers needed to name the given
4297 static unsigned getNumModuleIdentifiers(Module *Mod) {
4298 unsigned Result = 1;
4299 while (Mod->Parent) {
4306 ImportDecl::ImportDecl(DeclContext *DC, SourceLocation StartLoc,
4308 ArrayRef<SourceLocation> IdentifierLocs)
4309 : Decl(Import, DC, StartLoc), ImportedAndComplete(Imported, true),
4312 assert(getNumModuleIdentifiers(Imported) == IdentifierLocs.size());
4313 auto *StoredLocs = getTrailingObjects<SourceLocation>();
4314 std::uninitialized_copy(IdentifierLocs.begin(), IdentifierLocs.end(),
4318 ImportDecl::ImportDecl(DeclContext *DC, SourceLocation StartLoc,
4319 Module *Imported, SourceLocation EndLoc)
4320 : Decl(Import, DC, StartLoc), ImportedAndComplete(Imported, false),
4323 *getTrailingObjects<SourceLocation>() = EndLoc;
4326 ImportDecl *ImportDecl::Create(ASTContext &C, DeclContext *DC,
4327 SourceLocation StartLoc, Module *Imported,
4328 ArrayRef<SourceLocation> IdentifierLocs) {
4330 additionalSizeToAlloc<SourceLocation>(IdentifierLocs.size()))
4331 ImportDecl(DC, StartLoc, Imported, IdentifierLocs);
4334 ImportDecl *ImportDecl::CreateImplicit(ASTContext &C, DeclContext *DC,
4335 SourceLocation StartLoc,
4337 SourceLocation EndLoc) {
4338 ImportDecl *Import = new (C, DC, additionalSizeToAlloc<SourceLocation>(1))
4339 ImportDecl(DC, StartLoc, Imported, EndLoc);
4340 Import->setImplicit();
4344 ImportDecl *ImportDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4345 unsigned NumLocations) {
4346 return new (C, ID, additionalSizeToAlloc<SourceLocation>(NumLocations))
4347 ImportDecl(EmptyShell());
4350 ArrayRef<SourceLocation> ImportDecl::getIdentifierLocs() const {
4351 if (!ImportedAndComplete.getInt())
4354 const auto *StoredLocs = getTrailingObjects<SourceLocation>();
4355 return llvm::makeArrayRef(StoredLocs,
4356 getNumModuleIdentifiers(getImportedModule()));
4359 SourceRange ImportDecl::getSourceRange() const {
4360 if (!ImportedAndComplete.getInt())
4361 return SourceRange(getLocation(), *getTrailingObjects<SourceLocation>());
4363 return SourceRange(getLocation(), getIdentifierLocs().back());
4366 //===----------------------------------------------------------------------===//
4367 // ExportDecl Implementation
4368 //===----------------------------------------------------------------------===//
4370 void ExportDecl::anchor() {}
4372 ExportDecl *ExportDecl::Create(ASTContext &C, DeclContext *DC,
4373 SourceLocation ExportLoc) {
4374 return new (C, DC) ExportDecl(DC, ExportLoc);
4377 ExportDecl *ExportDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4378 return new (C, ID) ExportDecl(nullptr, SourceLocation());