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 // For ObjC methods, look through categories and use the interface as context.
1418 if (auto *MD = dyn_cast<ObjCMethodDecl>(this))
1419 if (auto *ID = MD->getClassInterface())
1422 if (Ctx->isFunctionOrMethod()) {
1427 typedef SmallVector<const DeclContext *, 8> ContextsTy;
1428 ContextsTy Contexts;
1430 // Collect contexts.
1431 while (Ctx && isa<NamedDecl>(Ctx)) {
1432 Contexts.push_back(Ctx);
1433 Ctx = Ctx->getParent();
1436 for (const DeclContext *DC : reverse(Contexts)) {
1437 if (const auto *Spec = dyn_cast<ClassTemplateSpecializationDecl>(DC)) {
1438 OS << Spec->getName();
1439 const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs();
1440 TemplateSpecializationType::PrintTemplateArgumentList(
1441 OS, TemplateArgs.asArray(), P);
1442 } else if (const auto *ND = dyn_cast<NamespaceDecl>(DC)) {
1443 if (P.SuppressUnwrittenScope &&
1444 (ND->isAnonymousNamespace() || ND->isInline()))
1446 if (ND->isAnonymousNamespace()) {
1447 OS << (P.MSVCFormatting ? "`anonymous namespace\'"
1448 : "(anonymous namespace)");
1452 } else if (const auto *RD = dyn_cast<RecordDecl>(DC)) {
1453 if (!RD->getIdentifier())
1454 OS << "(anonymous " << RD->getKindName() << ')';
1457 } else if (const auto *FD = dyn_cast<FunctionDecl>(DC)) {
1458 const FunctionProtoType *FT = nullptr;
1459 if (FD->hasWrittenPrototype())
1460 FT = dyn_cast<FunctionProtoType>(FD->getType()->castAs<FunctionType>());
1464 unsigned NumParams = FD->getNumParams();
1465 for (unsigned i = 0; i < NumParams; ++i) {
1468 OS << FD->getParamDecl(i)->getType().stream(P);
1471 if (FT->isVariadic()) {
1478 } else if (const auto *ED = dyn_cast<EnumDecl>(DC)) {
1479 // C++ [dcl.enum]p10: Each enum-name and each unscoped
1480 // enumerator is declared in the scope that immediately contains
1481 // the enum-specifier. Each scoped enumerator is declared in the
1482 // scope of the enumeration.
1483 if (ED->isScoped() || ED->getIdentifier())
1488 OS << *cast<NamedDecl>(DC);
1493 if (getDeclName() || isa<DecompositionDecl>(this))
1496 OS << "(anonymous)";
1499 void NamedDecl::getNameForDiagnostic(raw_ostream &OS,
1500 const PrintingPolicy &Policy,
1501 bool Qualified) const {
1503 printQualifiedName(OS, Policy);
1508 template<typename T> static bool isRedeclarableImpl(Redeclarable<T> *) {
1511 static bool isRedeclarableImpl(...) { return false; }
1512 static bool isRedeclarable(Decl::Kind K) {
1514 #define DECL(Type, Base) \
1516 return isRedeclarableImpl((Type##Decl *)nullptr);
1517 #define ABSTRACT_DECL(DECL)
1518 #include "clang/AST/DeclNodes.inc"
1520 llvm_unreachable("unknown decl kind");
1523 bool NamedDecl::declarationReplaces(NamedDecl *OldD, bool IsKnownNewer) const {
1524 assert(getDeclName() == OldD->getDeclName() && "Declaration name mismatch");
1526 // Never replace one imported declaration with another; we need both results
1527 // when re-exporting.
1528 if (OldD->isFromASTFile() && isFromASTFile())
1531 // A kind mismatch implies that the declaration is not replaced.
1532 if (OldD->getKind() != getKind())
1535 // For method declarations, we never replace. (Why?)
1536 if (isa<ObjCMethodDecl>(this))
1539 // For parameters, pick the newer one. This is either an error or (in
1540 // Objective-C) permitted as an extension.
1541 if (isa<ParmVarDecl>(this))
1544 // Inline namespaces can give us two declarations with the same
1545 // name and kind in the same scope but different contexts; we should
1546 // keep both declarations in this case.
1547 if (!this->getDeclContext()->getRedeclContext()->Equals(
1548 OldD->getDeclContext()->getRedeclContext()))
1551 // Using declarations can be replaced if they import the same name from the
1553 if (auto *UD = dyn_cast<UsingDecl>(this)) {
1554 ASTContext &Context = getASTContext();
1555 return Context.getCanonicalNestedNameSpecifier(UD->getQualifier()) ==
1556 Context.getCanonicalNestedNameSpecifier(
1557 cast<UsingDecl>(OldD)->getQualifier());
1559 if (auto *UUVD = dyn_cast<UnresolvedUsingValueDecl>(this)) {
1560 ASTContext &Context = getASTContext();
1561 return Context.getCanonicalNestedNameSpecifier(UUVD->getQualifier()) ==
1562 Context.getCanonicalNestedNameSpecifier(
1563 cast<UnresolvedUsingValueDecl>(OldD)->getQualifier());
1566 // UsingDirectiveDecl's are not really NamedDecl's, and all have same name.
1567 // They can be replaced if they nominate the same namespace.
1568 // FIXME: Is this true even if they have different module visibility?
1569 if (auto *UD = dyn_cast<UsingDirectiveDecl>(this))
1570 return UD->getNominatedNamespace()->getOriginalNamespace() ==
1571 cast<UsingDirectiveDecl>(OldD)->getNominatedNamespace()
1572 ->getOriginalNamespace();
1574 if (isRedeclarable(getKind())) {
1575 if (getCanonicalDecl() != OldD->getCanonicalDecl())
1581 // Check whether this is actually newer than OldD. We want to keep the
1582 // newer declaration. This loop will usually only iterate once, because
1583 // OldD is usually the previous declaration.
1584 for (auto D : redecls()) {
1588 // If we reach the canonical declaration, then OldD is not actually older
1591 // FIXME: In this case, we should not add this decl to the lookup table.
1592 if (D->isCanonicalDecl())
1596 // It's a newer declaration of the same kind of declaration in the same
1597 // scope: we want this decl instead of the existing one.
1601 // In all other cases, we need to keep both declarations in case they have
1602 // different visibility. Any attempt to use the name will result in an
1603 // ambiguity if more than one is visible.
1607 bool NamedDecl::hasLinkage() const {
1608 return getFormalLinkage() != NoLinkage;
1611 NamedDecl *NamedDecl::getUnderlyingDeclImpl() {
1612 NamedDecl *ND = this;
1613 while (auto *UD = dyn_cast<UsingShadowDecl>(ND))
1614 ND = UD->getTargetDecl();
1616 if (auto *AD = dyn_cast<ObjCCompatibleAliasDecl>(ND))
1617 return AD->getClassInterface();
1619 if (auto *AD = dyn_cast<NamespaceAliasDecl>(ND))
1620 return AD->getNamespace();
1625 bool NamedDecl::isCXXInstanceMember() const {
1626 if (!isCXXClassMember())
1629 const NamedDecl *D = this;
1630 if (isa<UsingShadowDecl>(D))
1631 D = cast<UsingShadowDecl>(D)->getTargetDecl();
1633 if (isa<FieldDecl>(D) || isa<IndirectFieldDecl>(D) || isa<MSPropertyDecl>(D))
1635 if (const auto *MD = dyn_cast_or_null<CXXMethodDecl>(D->getAsFunction()))
1636 return MD->isInstance();
1640 //===----------------------------------------------------------------------===//
1641 // DeclaratorDecl Implementation
1642 //===----------------------------------------------------------------------===//
1644 template <typename DeclT>
1645 static SourceLocation getTemplateOrInnerLocStart(const DeclT *decl) {
1646 if (decl->getNumTemplateParameterLists() > 0)
1647 return decl->getTemplateParameterList(0)->getTemplateLoc();
1649 return decl->getInnerLocStart();
1652 SourceLocation DeclaratorDecl::getTypeSpecStartLoc() const {
1653 TypeSourceInfo *TSI = getTypeSourceInfo();
1654 if (TSI) return TSI->getTypeLoc().getBeginLoc();
1655 return SourceLocation();
1658 void DeclaratorDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) {
1660 // Make sure the extended decl info is allocated.
1661 if (!hasExtInfo()) {
1662 // Save (non-extended) type source info pointer.
1663 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
1664 // Allocate external info struct.
1665 DeclInfo = new (getASTContext()) ExtInfo;
1666 // Restore savedTInfo into (extended) decl info.
1667 getExtInfo()->TInfo = savedTInfo;
1669 // Set qualifier info.
1670 getExtInfo()->QualifierLoc = QualifierLoc;
1672 // Here Qualifier == 0, i.e., we are removing the qualifier (if any).
1674 if (getExtInfo()->NumTemplParamLists == 0) {
1675 // Save type source info pointer.
1676 TypeSourceInfo *savedTInfo = getExtInfo()->TInfo;
1677 // Deallocate the extended decl info.
1678 getASTContext().Deallocate(getExtInfo());
1679 // Restore savedTInfo into (non-extended) decl info.
1680 DeclInfo = savedTInfo;
1683 getExtInfo()->QualifierLoc = QualifierLoc;
1688 void DeclaratorDecl::setTemplateParameterListsInfo(
1689 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
1690 assert(!TPLists.empty());
1691 // Make sure the extended decl info is allocated.
1692 if (!hasExtInfo()) {
1693 // Save (non-extended) type source info pointer.
1694 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
1695 // Allocate external info struct.
1696 DeclInfo = new (getASTContext()) ExtInfo;
1697 // Restore savedTInfo into (extended) decl info.
1698 getExtInfo()->TInfo = savedTInfo;
1700 // Set the template parameter lists info.
1701 getExtInfo()->setTemplateParameterListsInfo(Context, TPLists);
1704 SourceLocation DeclaratorDecl::getOuterLocStart() const {
1705 return getTemplateOrInnerLocStart(this);
1710 // Helper function: returns true if QT is or contains a type
1711 // having a postfix component.
1712 bool typeIsPostfix(clang::QualType QT) {
1714 const Type* T = QT.getTypePtr();
1715 switch (T->getTypeClass()) {
1719 QT = cast<PointerType>(T)->getPointeeType();
1721 case Type::BlockPointer:
1722 QT = cast<BlockPointerType>(T)->getPointeeType();
1724 case Type::MemberPointer:
1725 QT = cast<MemberPointerType>(T)->getPointeeType();
1727 case Type::LValueReference:
1728 case Type::RValueReference:
1729 QT = cast<ReferenceType>(T)->getPointeeType();
1731 case Type::PackExpansion:
1732 QT = cast<PackExpansionType>(T)->getPattern();
1735 case Type::ConstantArray:
1736 case Type::DependentSizedArray:
1737 case Type::IncompleteArray:
1738 case Type::VariableArray:
1739 case Type::FunctionProto:
1740 case Type::FunctionNoProto:
1748 SourceRange DeclaratorDecl::getSourceRange() const {
1749 SourceLocation RangeEnd = getLocation();
1750 if (TypeSourceInfo *TInfo = getTypeSourceInfo()) {
1751 // If the declaration has no name or the type extends past the name take the
1752 // end location of the type.
1753 if (!getDeclName() || typeIsPostfix(TInfo->getType()))
1754 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
1756 return SourceRange(getOuterLocStart(), RangeEnd);
1759 void QualifierInfo::setTemplateParameterListsInfo(
1760 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
1761 // Free previous template parameters (if any).
1762 if (NumTemplParamLists > 0) {
1763 Context.Deallocate(TemplParamLists);
1764 TemplParamLists = nullptr;
1765 NumTemplParamLists = 0;
1767 // Set info on matched template parameter lists (if any).
1768 if (!TPLists.empty()) {
1769 TemplParamLists = new (Context) TemplateParameterList *[TPLists.size()];
1770 NumTemplParamLists = TPLists.size();
1771 std::copy(TPLists.begin(), TPLists.end(), TemplParamLists);
1775 //===----------------------------------------------------------------------===//
1776 // VarDecl Implementation
1777 //===----------------------------------------------------------------------===//
1779 const char *VarDecl::getStorageClassSpecifierString(StorageClass SC) {
1781 case SC_None: break;
1782 case SC_Auto: return "auto";
1783 case SC_Extern: return "extern";
1784 case SC_PrivateExtern: return "__private_extern__";
1785 case SC_Register: return "register";
1786 case SC_Static: return "static";
1789 llvm_unreachable("Invalid storage class");
1792 VarDecl::VarDecl(Kind DK, ASTContext &C, DeclContext *DC,
1793 SourceLocation StartLoc, SourceLocation IdLoc,
1794 IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo,
1796 : DeclaratorDecl(DK, DC, IdLoc, Id, T, TInfo, StartLoc),
1797 redeclarable_base(C), Init() {
1798 static_assert(sizeof(VarDeclBitfields) <= sizeof(unsigned),
1799 "VarDeclBitfields too large!");
1800 static_assert(sizeof(ParmVarDeclBitfields) <= sizeof(unsigned),
1801 "ParmVarDeclBitfields too large!");
1802 static_assert(sizeof(NonParmVarDeclBitfields) <= sizeof(unsigned),
1803 "NonParmVarDeclBitfields too large!");
1805 VarDeclBits.SClass = SC;
1806 // Everything else is implicitly initialized to false.
1809 VarDecl *VarDecl::Create(ASTContext &C, DeclContext *DC,
1810 SourceLocation StartL, SourceLocation IdL,
1811 IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo,
1813 return new (C, DC) VarDecl(Var, C, DC, StartL, IdL, Id, T, TInfo, S);
1816 VarDecl *VarDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
1818 VarDecl(Var, C, nullptr, SourceLocation(), SourceLocation(), nullptr,
1819 QualType(), nullptr, SC_None);
1822 void VarDecl::setStorageClass(StorageClass SC) {
1823 assert(isLegalForVariable(SC));
1824 VarDeclBits.SClass = SC;
1827 VarDecl::TLSKind VarDecl::getTLSKind() const {
1828 switch (VarDeclBits.TSCSpec) {
1829 case TSCS_unspecified:
1830 if (!hasAttr<ThreadAttr>() &&
1831 !(getASTContext().getLangOpts().OpenMPUseTLS &&
1832 getASTContext().getTargetInfo().isTLSSupported() &&
1833 hasAttr<OMPThreadPrivateDeclAttr>()))
1835 return ((getASTContext().getLangOpts().isCompatibleWithMSVC(
1836 LangOptions::MSVC2015)) ||
1837 hasAttr<OMPThreadPrivateDeclAttr>())
1840 case TSCS___thread: // Fall through.
1841 case TSCS__Thread_local:
1843 case TSCS_thread_local:
1846 llvm_unreachable("Unknown thread storage class specifier!");
1849 SourceRange VarDecl::getSourceRange() const {
1850 if (const Expr *Init = getInit()) {
1851 SourceLocation InitEnd = Init->getLocEnd();
1852 // If Init is implicit, ignore its source range and fallback on
1853 // DeclaratorDecl::getSourceRange() to handle postfix elements.
1854 if (InitEnd.isValid() && InitEnd != getLocation())
1855 return SourceRange(getOuterLocStart(), InitEnd);
1857 return DeclaratorDecl::getSourceRange();
1860 template<typename T>
1861 static LanguageLinkage getDeclLanguageLinkage(const T &D) {
1862 // C++ [dcl.link]p1: All function types, function names with external linkage,
1863 // and variable names with external linkage have a language linkage.
1864 if (!D.hasExternalFormalLinkage())
1865 return NoLanguageLinkage;
1867 // Language linkage is a C++ concept, but saying that everything else in C has
1868 // C language linkage fits the implementation nicely.
1869 ASTContext &Context = D.getASTContext();
1870 if (!Context.getLangOpts().CPlusPlus)
1871 return CLanguageLinkage;
1873 // C++ [dcl.link]p4: A C language linkage is ignored in determining the
1874 // language linkage of the names of class members and the function type of
1875 // class member functions.
1876 const DeclContext *DC = D.getDeclContext();
1878 return CXXLanguageLinkage;
1880 // If the first decl is in an extern "C" context, any other redeclaration
1881 // will have C language linkage. If the first one is not in an extern "C"
1882 // context, we would have reported an error for any other decl being in one.
1883 if (isFirstInExternCContext(&D))
1884 return CLanguageLinkage;
1885 return CXXLanguageLinkage;
1888 template<typename T>
1889 static bool isDeclExternC(const T &D) {
1890 // Since the context is ignored for class members, they can only have C++
1891 // language linkage or no language linkage.
1892 const DeclContext *DC = D.getDeclContext();
1893 if (DC->isRecord()) {
1894 assert(D.getASTContext().getLangOpts().CPlusPlus);
1898 return D.getLanguageLinkage() == CLanguageLinkage;
1901 LanguageLinkage VarDecl::getLanguageLinkage() const {
1902 return getDeclLanguageLinkage(*this);
1905 bool VarDecl::isExternC() const {
1906 return isDeclExternC(*this);
1909 bool VarDecl::isInExternCContext() const {
1910 return getLexicalDeclContext()->isExternCContext();
1913 bool VarDecl::isInExternCXXContext() const {
1914 return getLexicalDeclContext()->isExternCXXContext();
1917 VarDecl *VarDecl::getCanonicalDecl() { return getFirstDecl(); }
1919 VarDecl::DefinitionKind
1920 VarDecl::isThisDeclarationADefinition(ASTContext &C) const {
1921 // C++ [basic.def]p2:
1922 // A declaration is a definition unless [...] it contains the 'extern'
1923 // specifier or a linkage-specification and neither an initializer [...],
1924 // it declares a non-inline static data member in a class declaration [...],
1925 // it declares a static data member outside a class definition and the variable
1926 // was defined within the class with the constexpr specifier [...],
1927 // C++1y [temp.expl.spec]p15:
1928 // An explicit specialization of a static data member or an explicit
1929 // specialization of a static data member template is a definition if the
1930 // declaration includes an initializer; otherwise, it is a declaration.
1932 // FIXME: How do you declare (but not define) a partial specialization of
1933 // a static data member template outside the containing class?
1934 if (isThisDeclarationADemotedDefinition())
1935 return DeclarationOnly;
1937 if (isStaticDataMember()) {
1938 if (isOutOfLine() &&
1939 !(getCanonicalDecl()->isInline() &&
1940 getCanonicalDecl()->isConstexpr()) &&
1942 // If the first declaration is out-of-line, this may be an
1943 // instantiation of an out-of-line partial specialization of a variable
1944 // template for which we have not yet instantiated the initializer.
1945 (getFirstDecl()->isOutOfLine()
1946 ? getTemplateSpecializationKind() == TSK_Undeclared
1947 : getTemplateSpecializationKind() !=
1948 TSK_ExplicitSpecialization) ||
1949 isa<VarTemplatePartialSpecializationDecl>(this)))
1951 else if (!isOutOfLine() && isInline())
1954 return DeclarationOnly;
1957 // A definition of an identifier is a declaration for that identifier that
1958 // [...] causes storage to be reserved for that object.
1959 // Note: that applies for all non-file-scope objects.
1961 // If the declaration of an identifier for an object has file scope and an
1962 // initializer, the declaration is an external definition for the identifier
1966 if (hasDefiningAttr())
1969 if (const auto *SAA = getAttr<SelectAnyAttr>())
1970 if (!SAA->isInherited())
1973 // A variable template specialization (other than a static data member
1974 // template or an explicit specialization) is a declaration until we
1975 // instantiate its initializer.
1976 if (isa<VarTemplateSpecializationDecl>(this) &&
1977 getTemplateSpecializationKind() != TSK_ExplicitSpecialization)
1978 return DeclarationOnly;
1980 if (hasExternalStorage())
1981 return DeclarationOnly;
1984 // A declaration directly contained in a linkage-specification is treated
1985 // as if it contains the extern specifier for the purpose of determining
1986 // the linkage of the declared name and whether it is a definition.
1987 if (isSingleLineLanguageLinkage(*this))
1988 return DeclarationOnly;
1991 // A declaration of an object that has file scope without an initializer,
1992 // and without a storage class specifier or the scs 'static', constitutes
1993 // a tentative definition.
1994 // No such thing in C++.
1995 if (!C.getLangOpts().CPlusPlus && isFileVarDecl())
1996 return TentativeDefinition;
1998 // What's left is (in C, block-scope) declarations without initializers or
1999 // external storage. These are definitions.
2003 VarDecl *VarDecl::getActingDefinition() {
2004 DefinitionKind Kind = isThisDeclarationADefinition();
2005 if (Kind != TentativeDefinition)
2008 VarDecl *LastTentative = nullptr;
2009 VarDecl *First = getFirstDecl();
2010 for (auto I : First->redecls()) {
2011 Kind = I->isThisDeclarationADefinition();
2012 if (Kind == Definition)
2014 else if (Kind == TentativeDefinition)
2017 return LastTentative;
2020 VarDecl *VarDecl::getDefinition(ASTContext &C) {
2021 VarDecl *First = getFirstDecl();
2022 for (auto I : First->redecls()) {
2023 if (I->isThisDeclarationADefinition(C) == Definition)
2029 VarDecl::DefinitionKind VarDecl::hasDefinition(ASTContext &C) const {
2030 DefinitionKind Kind = DeclarationOnly;
2032 const VarDecl *First = getFirstDecl();
2033 for (auto I : First->redecls()) {
2034 Kind = std::max(Kind, I->isThisDeclarationADefinition(C));
2035 if (Kind == Definition)
2042 const Expr *VarDecl::getAnyInitializer(const VarDecl *&D) const {
2043 for (auto I : redecls()) {
2044 if (auto Expr = I->getInit()) {
2052 bool VarDecl::hasInit() const {
2053 if (auto *P = dyn_cast<ParmVarDecl>(this))
2054 if (P->hasUnparsedDefaultArg() || P->hasUninstantiatedDefaultArg())
2057 return !Init.isNull();
2060 Expr *VarDecl::getInit() {
2064 if (auto *S = Init.dyn_cast<Stmt *>())
2065 return cast<Expr>(S);
2067 return cast_or_null<Expr>(Init.get<EvaluatedStmt *>()->Value);
2070 Stmt **VarDecl::getInitAddress() {
2071 if (auto *ES = Init.dyn_cast<EvaluatedStmt *>())
2074 return Init.getAddrOfPtr1();
2077 bool VarDecl::isOutOfLine() const {
2078 if (Decl::isOutOfLine())
2081 if (!isStaticDataMember())
2084 // If this static data member was instantiated from a static data member of
2085 // a class template, check whether that static data member was defined
2087 if (VarDecl *VD = getInstantiatedFromStaticDataMember())
2088 return VD->isOutOfLine();
2093 void VarDecl::setInit(Expr *I) {
2094 if (auto *Eval = Init.dyn_cast<EvaluatedStmt *>()) {
2095 Eval->~EvaluatedStmt();
2096 getASTContext().Deallocate(Eval);
2102 bool VarDecl::isUsableInConstantExpressions(ASTContext &C) const {
2103 const LangOptions &Lang = C.getLangOpts();
2105 if (!Lang.CPlusPlus)
2108 // In C++11, any variable of reference type can be used in a constant
2109 // expression if it is initialized by a constant expression.
2110 if (Lang.CPlusPlus11 && getType()->isReferenceType())
2113 // Only const objects can be used in constant expressions in C++. C++98 does
2114 // not require the variable to be non-volatile, but we consider this to be a
2116 if (!getType().isConstQualified() || getType().isVolatileQualified())
2119 // In C++, const, non-volatile variables of integral or enumeration types
2120 // can be used in constant expressions.
2121 if (getType()->isIntegralOrEnumerationType())
2124 // Additionally, in C++11, non-volatile constexpr variables can be used in
2125 // constant expressions.
2126 return Lang.CPlusPlus11 && isConstexpr();
2129 /// Convert the initializer for this declaration to the elaborated EvaluatedStmt
2130 /// form, which contains extra information on the evaluated value of the
2132 EvaluatedStmt *VarDecl::ensureEvaluatedStmt() const {
2133 auto *Eval = Init.dyn_cast<EvaluatedStmt *>();
2135 // Note: EvaluatedStmt contains an APValue, which usually holds
2136 // resources not allocated from the ASTContext. We need to do some
2137 // work to avoid leaking those, but we do so in VarDecl::evaluateValue
2138 // where we can detect whether there's anything to clean up or not.
2139 Eval = new (getASTContext()) EvaluatedStmt;
2140 Eval->Value = Init.get<Stmt *>();
2146 APValue *VarDecl::evaluateValue() const {
2147 SmallVector<PartialDiagnosticAt, 8> Notes;
2148 return evaluateValue(Notes);
2151 APValue *VarDecl::evaluateValue(
2152 SmallVectorImpl<PartialDiagnosticAt> &Notes) const {
2153 EvaluatedStmt *Eval = ensureEvaluatedStmt();
2155 // We only produce notes indicating why an initializer is non-constant the
2156 // first time it is evaluated. FIXME: The notes won't always be emitted the
2157 // first time we try evaluation, so might not be produced at all.
2158 if (Eval->WasEvaluated)
2159 return Eval->Evaluated.isUninit() ? nullptr : &Eval->Evaluated;
2161 const auto *Init = cast<Expr>(Eval->Value);
2162 assert(!Init->isValueDependent());
2164 if (Eval->IsEvaluating) {
2165 // FIXME: Produce a diagnostic for self-initialization.
2166 Eval->CheckedICE = true;
2167 Eval->IsICE = false;
2171 Eval->IsEvaluating = true;
2173 bool Result = Init->EvaluateAsInitializer(Eval->Evaluated, getASTContext(),
2176 // Ensure the computed APValue is cleaned up later if evaluation succeeded,
2177 // or that it's empty (so that there's nothing to clean up) if evaluation
2180 Eval->Evaluated = APValue();
2181 else if (Eval->Evaluated.needsCleanup())
2182 getASTContext().addDestruction(&Eval->Evaluated);
2184 Eval->IsEvaluating = false;
2185 Eval->WasEvaluated = true;
2187 // In C++11, we have determined whether the initializer was a constant
2188 // expression as a side-effect.
2189 if (getASTContext().getLangOpts().CPlusPlus11 && !Eval->CheckedICE) {
2190 Eval->CheckedICE = true;
2191 Eval->IsICE = Result && Notes.empty();
2194 return Result ? &Eval->Evaluated : nullptr;
2197 APValue *VarDecl::getEvaluatedValue() const {
2198 if (EvaluatedStmt *Eval = Init.dyn_cast<EvaluatedStmt *>())
2199 if (Eval->WasEvaluated)
2200 return &Eval->Evaluated;
2205 bool VarDecl::isInitKnownICE() const {
2206 if (EvaluatedStmt *Eval = Init.dyn_cast<EvaluatedStmt *>())
2207 return Eval->CheckedICE;
2212 bool VarDecl::isInitICE() const {
2213 assert(isInitKnownICE() &&
2214 "Check whether we already know that the initializer is an ICE");
2215 return Init.get<EvaluatedStmt *>()->IsICE;
2218 bool VarDecl::checkInitIsICE() const {
2219 // Initializers of weak variables are never ICEs.
2223 EvaluatedStmt *Eval = ensureEvaluatedStmt();
2224 if (Eval->CheckedICE)
2225 // We have already checked whether this subexpression is an
2226 // integral constant expression.
2229 const auto *Init = cast<Expr>(Eval->Value);
2230 assert(!Init->isValueDependent());
2232 // In C++11, evaluate the initializer to check whether it's a constant
2234 if (getASTContext().getLangOpts().CPlusPlus11) {
2235 SmallVector<PartialDiagnosticAt, 8> Notes;
2236 evaluateValue(Notes);
2240 // It's an ICE whether or not the definition we found is
2241 // out-of-line. See DR 721 and the discussion in Clang PR
2242 // 6206 for details.
2244 if (Eval->CheckingICE)
2246 Eval->CheckingICE = true;
2248 Eval->IsICE = Init->isIntegerConstantExpr(getASTContext());
2249 Eval->CheckingICE = false;
2250 Eval->CheckedICE = true;
2254 VarDecl *VarDecl::getTemplateInstantiationPattern() const {
2255 // If it's a variable template specialization, find the template or partial
2256 // specialization from which it was instantiated.
2257 if (auto *VDTemplSpec = dyn_cast<VarTemplateSpecializationDecl>(this)) {
2258 auto From = VDTemplSpec->getInstantiatedFrom();
2259 if (auto *VTD = From.dyn_cast<VarTemplateDecl *>()) {
2260 while (auto *NewVTD = VTD->getInstantiatedFromMemberTemplate()) {
2261 if (NewVTD->isMemberSpecialization())
2265 return VTD->getTemplatedDecl()->getDefinition();
2268 From.dyn_cast<VarTemplatePartialSpecializationDecl *>()) {
2269 while (auto *NewVTPSD = VTPSD->getInstantiatedFromMember()) {
2270 if (NewVTPSD->isMemberSpecialization())
2274 return VTPSD->getDefinition();
2278 if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo()) {
2279 if (isTemplateInstantiation(MSInfo->getTemplateSpecializationKind())) {
2280 VarDecl *VD = getInstantiatedFromStaticDataMember();
2281 while (auto *NewVD = VD->getInstantiatedFromStaticDataMember())
2283 return VD->getDefinition();
2287 if (VarTemplateDecl *VarTemplate = getDescribedVarTemplate()) {
2289 while (VarTemplate->getInstantiatedFromMemberTemplate()) {
2290 if (VarTemplate->isMemberSpecialization())
2292 VarTemplate = VarTemplate->getInstantiatedFromMemberTemplate();
2295 assert((!VarTemplate->getTemplatedDecl() ||
2296 !isTemplateInstantiation(getTemplateSpecializationKind())) &&
2297 "couldn't find pattern for variable instantiation");
2299 return VarTemplate->getTemplatedDecl();
2304 VarDecl *VarDecl::getInstantiatedFromStaticDataMember() const {
2305 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2306 return cast<VarDecl>(MSI->getInstantiatedFrom());
2311 TemplateSpecializationKind VarDecl::getTemplateSpecializationKind() const {
2312 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
2313 return Spec->getSpecializationKind();
2315 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2316 return MSI->getTemplateSpecializationKind();
2318 return TSK_Undeclared;
2321 SourceLocation VarDecl::getPointOfInstantiation() const {
2322 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
2323 return Spec->getPointOfInstantiation();
2325 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2326 return MSI->getPointOfInstantiation();
2328 return SourceLocation();
2331 VarTemplateDecl *VarDecl::getDescribedVarTemplate() const {
2332 return getASTContext().getTemplateOrSpecializationInfo(this)
2333 .dyn_cast<VarTemplateDecl *>();
2336 void VarDecl::setDescribedVarTemplate(VarTemplateDecl *Template) {
2337 getASTContext().setTemplateOrSpecializationInfo(this, Template);
2340 MemberSpecializationInfo *VarDecl::getMemberSpecializationInfo() const {
2341 if (isStaticDataMember())
2343 // return getASTContext().getInstantiatedFromStaticDataMember(this);
2344 return getASTContext().getTemplateOrSpecializationInfo(this)
2345 .dyn_cast<MemberSpecializationInfo *>();
2349 void VarDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
2350 SourceLocation PointOfInstantiation) {
2351 assert((isa<VarTemplateSpecializationDecl>(this) ||
2352 getMemberSpecializationInfo()) &&
2353 "not a variable or static data member template specialization");
2355 if (VarTemplateSpecializationDecl *Spec =
2356 dyn_cast<VarTemplateSpecializationDecl>(this)) {
2357 Spec->setSpecializationKind(TSK);
2358 if (TSK != TSK_ExplicitSpecialization && PointOfInstantiation.isValid() &&
2359 Spec->getPointOfInstantiation().isInvalid())
2360 Spec->setPointOfInstantiation(PointOfInstantiation);
2363 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo()) {
2364 MSI->setTemplateSpecializationKind(TSK);
2365 if (TSK != TSK_ExplicitSpecialization && PointOfInstantiation.isValid() &&
2366 MSI->getPointOfInstantiation().isInvalid())
2367 MSI->setPointOfInstantiation(PointOfInstantiation);
2372 VarDecl::setInstantiationOfStaticDataMember(VarDecl *VD,
2373 TemplateSpecializationKind TSK) {
2374 assert(getASTContext().getTemplateOrSpecializationInfo(this).isNull() &&
2375 "Previous template or instantiation?");
2376 getASTContext().setInstantiatedFromStaticDataMember(this, VD, TSK);
2379 //===----------------------------------------------------------------------===//
2380 // ParmVarDecl Implementation
2381 //===----------------------------------------------------------------------===//
2383 ParmVarDecl *ParmVarDecl::Create(ASTContext &C, DeclContext *DC,
2384 SourceLocation StartLoc,
2385 SourceLocation IdLoc, IdentifierInfo *Id,
2386 QualType T, TypeSourceInfo *TInfo,
2387 StorageClass S, Expr *DefArg) {
2388 return new (C, DC) ParmVarDecl(ParmVar, C, DC, StartLoc, IdLoc, Id, T, TInfo,
2392 QualType ParmVarDecl::getOriginalType() const {
2393 TypeSourceInfo *TSI = getTypeSourceInfo();
2394 QualType T = TSI ? TSI->getType() : getType();
2395 if (const auto *DT = dyn_cast<DecayedType>(T))
2396 return DT->getOriginalType();
2400 ParmVarDecl *ParmVarDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
2402 ParmVarDecl(ParmVar, C, nullptr, SourceLocation(), SourceLocation(),
2403 nullptr, QualType(), nullptr, SC_None, nullptr);
2406 SourceRange ParmVarDecl::getSourceRange() const {
2407 if (!hasInheritedDefaultArg()) {
2408 SourceRange ArgRange = getDefaultArgRange();
2409 if (ArgRange.isValid())
2410 return SourceRange(getOuterLocStart(), ArgRange.getEnd());
2413 // DeclaratorDecl considers the range of postfix types as overlapping with the
2414 // declaration name, but this is not the case with parameters in ObjC methods.
2415 if (isa<ObjCMethodDecl>(getDeclContext()))
2416 return SourceRange(DeclaratorDecl::getLocStart(), getLocation());
2418 return DeclaratorDecl::getSourceRange();
2421 Expr *ParmVarDecl::getDefaultArg() {
2422 assert(!hasUnparsedDefaultArg() && "Default argument is not yet parsed!");
2423 assert(!hasUninstantiatedDefaultArg() &&
2424 "Default argument is not yet instantiated!");
2426 Expr *Arg = getInit();
2427 if (auto *E = dyn_cast_or_null<ExprWithCleanups>(Arg))
2428 return E->getSubExpr();
2433 void ParmVarDecl::setDefaultArg(Expr *defarg) {
2434 ParmVarDeclBits.DefaultArgKind = DAK_Normal;
2438 SourceRange ParmVarDecl::getDefaultArgRange() const {
2439 switch (ParmVarDeclBits.DefaultArgKind) {
2442 // Nothing we can do here.
2443 return SourceRange();
2445 case DAK_Uninstantiated:
2446 return getUninstantiatedDefaultArg()->getSourceRange();
2449 if (const Expr *E = getInit())
2450 return E->getSourceRange();
2452 // Missing an actual expression, may be invalid.
2453 return SourceRange();
2455 llvm_unreachable("Invalid default argument kind.");
2458 void ParmVarDecl::setUninstantiatedDefaultArg(Expr *arg) {
2459 ParmVarDeclBits.DefaultArgKind = DAK_Uninstantiated;
2463 Expr *ParmVarDecl::getUninstantiatedDefaultArg() {
2464 assert(hasUninstantiatedDefaultArg() &&
2465 "Wrong kind of initialization expression!");
2466 return cast_or_null<Expr>(Init.get<Stmt *>());
2469 bool ParmVarDecl::hasDefaultArg() const {
2470 // FIXME: We should just return false for DAK_None here once callers are
2471 // prepared for the case that we encountered an invalid default argument and
2472 // were unable to even build an invalid expression.
2473 return hasUnparsedDefaultArg() || hasUninstantiatedDefaultArg() ||
2477 bool ParmVarDecl::isParameterPack() const {
2478 return isa<PackExpansionType>(getType());
2481 void ParmVarDecl::setParameterIndexLarge(unsigned parameterIndex) {
2482 getASTContext().setParameterIndex(this, parameterIndex);
2483 ParmVarDeclBits.ParameterIndex = ParameterIndexSentinel;
2486 unsigned ParmVarDecl::getParameterIndexLarge() const {
2487 return getASTContext().getParameterIndex(this);
2490 //===----------------------------------------------------------------------===//
2491 // FunctionDecl Implementation
2492 //===----------------------------------------------------------------------===//
2494 void FunctionDecl::getNameForDiagnostic(
2495 raw_ostream &OS, const PrintingPolicy &Policy, bool Qualified) const {
2496 NamedDecl::getNameForDiagnostic(OS, Policy, Qualified);
2497 const TemplateArgumentList *TemplateArgs = getTemplateSpecializationArgs();
2499 TemplateSpecializationType::PrintTemplateArgumentList(
2500 OS, TemplateArgs->asArray(), Policy);
2503 bool FunctionDecl::isVariadic() const {
2504 if (const auto *FT = getType()->getAs<FunctionProtoType>())
2505 return FT->isVariadic();
2509 bool FunctionDecl::hasBody(const FunctionDecl *&Definition) const {
2510 for (auto I : redecls()) {
2511 if (I->doesThisDeclarationHaveABody()) {
2520 bool FunctionDecl::hasTrivialBody() const
2522 Stmt *S = getBody();
2524 // Since we don't have a body for this function, we don't know if it's
2529 if (isa<CompoundStmt>(S) && cast<CompoundStmt>(S)->body_empty())
2534 bool FunctionDecl::isDefined(const FunctionDecl *&Definition) const {
2535 for (auto I : redecls()) {
2536 if (I->IsDeleted || I->IsDefaulted || I->Body || I->IsLateTemplateParsed ||
2537 I->hasDefiningAttr()) {
2538 Definition = I->IsDeleted ? I->getCanonicalDecl() : I;
2546 Stmt *FunctionDecl::getBody(const FunctionDecl *&Definition) const {
2547 if (!hasBody(Definition))
2550 if (Definition->Body)
2551 return Definition->Body.get(getASTContext().getExternalSource());
2556 void FunctionDecl::setBody(Stmt *B) {
2559 EndRangeLoc = B->getLocEnd();
2562 void FunctionDecl::setPure(bool P) {
2565 if (auto *Parent = dyn_cast<CXXRecordDecl>(getDeclContext()))
2566 Parent->markedVirtualFunctionPure();
2569 template<std::size_t Len>
2570 static bool isNamed(const NamedDecl *ND, const char (&Str)[Len]) {
2571 IdentifierInfo *II = ND->getIdentifier();
2572 return II && II->isStr(Str);
2575 bool FunctionDecl::isMain() const {
2576 const TranslationUnitDecl *tunit =
2577 dyn_cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext());
2579 !tunit->getASTContext().getLangOpts().Freestanding &&
2580 isNamed(this, "main");
2583 bool FunctionDecl::isMSVCRTEntryPoint() const {
2584 const TranslationUnitDecl *TUnit =
2585 dyn_cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext());
2589 // Even though we aren't really targeting MSVCRT if we are freestanding,
2590 // semantic analysis for these functions remains the same.
2592 // MSVCRT entry points only exist on MSVCRT targets.
2593 if (!TUnit->getASTContext().getTargetInfo().getTriple().isOSMSVCRT())
2596 // Nameless functions like constructors cannot be entry points.
2597 if (!getIdentifier())
2600 return llvm::StringSwitch<bool>(getName())
2601 .Cases("main", // an ANSI console app
2602 "wmain", // a Unicode console App
2603 "WinMain", // an ANSI GUI app
2604 "wWinMain", // a Unicode GUI app
2610 bool FunctionDecl::isReservedGlobalPlacementOperator() const {
2611 assert(getDeclName().getNameKind() == DeclarationName::CXXOperatorName);
2612 assert(getDeclName().getCXXOverloadedOperator() == OO_New ||
2613 getDeclName().getCXXOverloadedOperator() == OO_Delete ||
2614 getDeclName().getCXXOverloadedOperator() == OO_Array_New ||
2615 getDeclName().getCXXOverloadedOperator() == OO_Array_Delete);
2617 if (!getDeclContext()->getRedeclContext()->isTranslationUnit())
2620 const auto *proto = getType()->castAs<FunctionProtoType>();
2621 if (proto->getNumParams() != 2 || proto->isVariadic())
2624 ASTContext &Context =
2625 cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext())
2628 // The result type and first argument type are constant across all
2629 // these operators. The second argument must be exactly void*.
2630 return (proto->getParamType(1).getCanonicalType() == Context.VoidPtrTy);
2633 bool FunctionDecl::isReplaceableGlobalAllocationFunction() const {
2634 if (getDeclName().getNameKind() != DeclarationName::CXXOperatorName)
2636 if (getDeclName().getCXXOverloadedOperator() != OO_New &&
2637 getDeclName().getCXXOverloadedOperator() != OO_Delete &&
2638 getDeclName().getCXXOverloadedOperator() != OO_Array_New &&
2639 getDeclName().getCXXOverloadedOperator() != OO_Array_Delete)
2642 if (isa<CXXRecordDecl>(getDeclContext()))
2645 // This can only fail for an invalid 'operator new' declaration.
2646 if (!getDeclContext()->getRedeclContext()->isTranslationUnit())
2649 const auto *FPT = getType()->castAs<FunctionProtoType>();
2650 if (FPT->getNumParams() == 0 || FPT->getNumParams() > 3 || FPT->isVariadic())
2653 // If this is a single-parameter function, it must be a replaceable global
2654 // allocation or deallocation function.
2655 if (FPT->getNumParams() == 1)
2658 unsigned Params = 1;
2659 QualType Ty = FPT->getParamType(Params);
2660 ASTContext &Ctx = getASTContext();
2662 auto Consume = [&] {
2664 Ty = Params < FPT->getNumParams() ? FPT->getParamType(Params) : QualType();
2667 // In C++14, the next parameter can be a 'std::size_t' for sized delete.
2668 bool IsSizedDelete = false;
2669 if (Ctx.getLangOpts().SizedDeallocation &&
2670 (getDeclName().getCXXOverloadedOperator() == OO_Delete ||
2671 getDeclName().getCXXOverloadedOperator() == OO_Array_Delete) &&
2672 Ctx.hasSameType(Ty, Ctx.getSizeType())) {
2673 IsSizedDelete = true;
2677 // In C++17, the next parameter can be a 'std::align_val_t' for aligned
2679 if (Ctx.getLangOpts().AlignedAllocation && !Ty.isNull() && Ty->isAlignValT())
2682 // Finally, if this is not a sized delete, the final parameter can
2683 // be a 'const std::nothrow_t&'.
2684 if (!IsSizedDelete && !Ty.isNull() && Ty->isReferenceType()) {
2685 Ty = Ty->getPointeeType();
2686 if (Ty.getCVRQualifiers() != Qualifiers::Const)
2688 const CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
2689 if (RD && isNamed(RD, "nothrow_t") && RD->isInStdNamespace())
2693 return Params == FPT->getNumParams();
2696 LanguageLinkage FunctionDecl::getLanguageLinkage() const {
2697 return getDeclLanguageLinkage(*this);
2700 bool FunctionDecl::isExternC() const {
2701 return isDeclExternC(*this);
2704 bool FunctionDecl::isInExternCContext() const {
2705 return getLexicalDeclContext()->isExternCContext();
2708 bool FunctionDecl::isInExternCXXContext() const {
2709 return getLexicalDeclContext()->isExternCXXContext();
2712 bool FunctionDecl::isGlobal() const {
2713 if (const auto *Method = dyn_cast<CXXMethodDecl>(this))
2714 return Method->isStatic();
2716 if (getCanonicalDecl()->getStorageClass() == SC_Static)
2719 for (const DeclContext *DC = getDeclContext();
2721 DC = DC->getParent()) {
2722 if (const auto *Namespace = cast<NamespaceDecl>(DC)) {
2723 if (!Namespace->getDeclName())
2732 bool FunctionDecl::isNoReturn() const {
2733 if (hasAttr<NoReturnAttr>() || hasAttr<CXX11NoReturnAttr>() ||
2734 hasAttr<C11NoReturnAttr>())
2737 if (auto *FnTy = getType()->getAs<FunctionType>())
2738 return FnTy->getNoReturnAttr();
2744 FunctionDecl::setPreviousDeclaration(FunctionDecl *PrevDecl) {
2745 redeclarable_base::setPreviousDecl(PrevDecl);
2747 if (FunctionTemplateDecl *FunTmpl = getDescribedFunctionTemplate()) {
2748 FunctionTemplateDecl *PrevFunTmpl
2749 = PrevDecl? PrevDecl->getDescribedFunctionTemplate() : nullptr;
2750 assert((!PrevDecl || PrevFunTmpl) && "Function/function template mismatch");
2751 FunTmpl->setPreviousDecl(PrevFunTmpl);
2754 if (PrevDecl && PrevDecl->IsInline)
2758 FunctionDecl *FunctionDecl::getCanonicalDecl() { return getFirstDecl(); }
2760 /// \brief Returns a value indicating whether this function
2761 /// corresponds to a builtin function.
2763 /// The function corresponds to a built-in function if it is
2764 /// declared at translation scope or within an extern "C" block and
2765 /// its name matches with the name of a builtin. The returned value
2766 /// will be 0 for functions that do not correspond to a builtin, a
2767 /// value of type \c Builtin::ID if in the target-independent range
2768 /// \c [1,Builtin::First), or a target-specific builtin value.
2769 unsigned FunctionDecl::getBuiltinID() const {
2770 if (!getIdentifier())
2773 unsigned BuiltinID = getIdentifier()->getBuiltinID();
2777 ASTContext &Context = getASTContext();
2778 if (Context.getLangOpts().CPlusPlus) {
2779 const auto *LinkageDecl =
2780 dyn_cast<LinkageSpecDecl>(getFirstDecl()->getDeclContext());
2781 // In C++, the first declaration of a builtin is always inside an implicit
2783 // FIXME: A recognised library function may not be directly in an extern "C"
2784 // declaration, for instance "extern "C" { namespace std { decl } }".
2786 if (BuiltinID == Builtin::BI__GetExceptionInfo &&
2787 Context.getTargetInfo().getCXXABI().isMicrosoft())
2788 return Builtin::BI__GetExceptionInfo;
2791 if (LinkageDecl->getLanguage() != LinkageSpecDecl::lang_c)
2795 // If the function is marked "overloadable", it has a different mangled name
2796 // and is not the C library function.
2797 if (hasAttr<OverloadableAttr>())
2800 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))
2803 // This function has the name of a known C library
2804 // function. Determine whether it actually refers to the C library
2805 // function or whether it just has the same name.
2807 // If this is a static function, it's not a builtin.
2808 if (getStorageClass() == SC_Static)
2811 // OpenCL v1.2 s6.9.f - The library functions defined in
2812 // the C99 standard headers are not available.
2813 if (Context.getLangOpts().OpenCL &&
2814 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))
2821 /// getNumParams - Return the number of parameters this function must have
2822 /// based on its FunctionType. This is the length of the ParamInfo array
2823 /// after it has been created.
2824 unsigned FunctionDecl::getNumParams() const {
2825 const auto *FPT = getType()->getAs<FunctionProtoType>();
2826 return FPT ? FPT->getNumParams() : 0;
2829 void FunctionDecl::setParams(ASTContext &C,
2830 ArrayRef<ParmVarDecl *> NewParamInfo) {
2831 assert(!ParamInfo && "Already has param info!");
2832 assert(NewParamInfo.size() == getNumParams() && "Parameter count mismatch!");
2834 // Zero params -> null pointer.
2835 if (!NewParamInfo.empty()) {
2836 ParamInfo = new (C) ParmVarDecl*[NewParamInfo.size()];
2837 std::copy(NewParamInfo.begin(), NewParamInfo.end(), ParamInfo);
2841 /// getMinRequiredArguments - Returns the minimum number of arguments
2842 /// needed to call this function. This may be fewer than the number of
2843 /// function parameters, if some of the parameters have default
2844 /// arguments (in C++) or are parameter packs (C++11).
2845 unsigned FunctionDecl::getMinRequiredArguments() const {
2846 if (!getASTContext().getLangOpts().CPlusPlus)
2847 return getNumParams();
2849 unsigned NumRequiredArgs = 0;
2850 for (auto *Param : parameters())
2851 if (!Param->isParameterPack() && !Param->hasDefaultArg())
2853 return NumRequiredArgs;
2856 /// \brief The combination of the extern and inline keywords under MSVC forces
2857 /// the function to be required.
2859 /// Note: This function assumes that we will only get called when isInlined()
2860 /// would return true for this FunctionDecl.
2861 bool FunctionDecl::isMSExternInline() const {
2862 assert(isInlined() && "expected to get called on an inlined function!");
2864 const ASTContext &Context = getASTContext();
2865 if (!Context.getTargetInfo().getCXXABI().isMicrosoft() &&
2866 !hasAttr<DLLExportAttr>())
2869 for (const FunctionDecl *FD = getMostRecentDecl(); FD;
2870 FD = FD->getPreviousDecl())
2871 if (!FD->isImplicit() && FD->getStorageClass() == SC_Extern)
2877 static bool redeclForcesDefMSVC(const FunctionDecl *Redecl) {
2878 if (Redecl->getStorageClass() != SC_Extern)
2881 for (const FunctionDecl *FD = Redecl->getPreviousDecl(); FD;
2882 FD = FD->getPreviousDecl())
2883 if (!FD->isImplicit() && FD->getStorageClass() == SC_Extern)
2889 static bool RedeclForcesDefC99(const FunctionDecl *Redecl) {
2890 // Only consider file-scope declarations in this test.
2891 if (!Redecl->getLexicalDeclContext()->isTranslationUnit())
2894 // Only consider explicit declarations; the presence of a builtin for a
2895 // libcall shouldn't affect whether a definition is externally visible.
2896 if (Redecl->isImplicit())
2899 if (!Redecl->isInlineSpecified() || Redecl->getStorageClass() == SC_Extern)
2900 return true; // Not an inline definition
2905 /// \brief For a function declaration in C or C++, determine whether this
2906 /// declaration causes the definition to be externally visible.
2908 /// For instance, this determines if adding the current declaration to the set
2909 /// of redeclarations of the given functions causes
2910 /// isInlineDefinitionExternallyVisible to change from false to true.
2911 bool FunctionDecl::doesDeclarationForceExternallyVisibleDefinition() const {
2912 assert(!doesThisDeclarationHaveABody() &&
2913 "Must have a declaration without a body.");
2915 ASTContext &Context = getASTContext();
2917 if (Context.getLangOpts().MSVCCompat) {
2918 const FunctionDecl *Definition;
2919 if (hasBody(Definition) && Definition->isInlined() &&
2920 redeclForcesDefMSVC(this))
2924 if (Context.getLangOpts().GNUInline || hasAttr<GNUInlineAttr>()) {
2925 // With GNU inlining, a declaration with 'inline' but not 'extern', forces
2926 // an externally visible definition.
2928 // FIXME: What happens if gnu_inline gets added on after the first
2930 if (!isInlineSpecified() || getStorageClass() == SC_Extern)
2933 const FunctionDecl *Prev = this;
2934 bool FoundBody = false;
2935 while ((Prev = Prev->getPreviousDecl())) {
2936 FoundBody |= Prev->Body.isValid();
2939 // If it's not the case that both 'inline' and 'extern' are
2940 // specified on the definition, then it is always externally visible.
2941 if (!Prev->isInlineSpecified() ||
2942 Prev->getStorageClass() != SC_Extern)
2944 } else if (Prev->isInlineSpecified() &&
2945 Prev->getStorageClass() != SC_Extern) {
2952 if (Context.getLangOpts().CPlusPlus)
2956 // [...] If all of the file scope declarations for a function in a
2957 // translation unit include the inline function specifier without extern,
2958 // then the definition in that translation unit is an inline definition.
2959 if (isInlineSpecified() && getStorageClass() != SC_Extern)
2961 const FunctionDecl *Prev = this;
2962 bool FoundBody = false;
2963 while ((Prev = Prev->getPreviousDecl())) {
2964 FoundBody |= Prev->Body.isValid();
2965 if (RedeclForcesDefC99(Prev))
2971 SourceRange FunctionDecl::getReturnTypeSourceRange() const {
2972 const TypeSourceInfo *TSI = getTypeSourceInfo();
2974 return SourceRange();
2975 FunctionTypeLoc FTL =
2976 TSI->getTypeLoc().IgnoreParens().getAs<FunctionTypeLoc>();
2978 return SourceRange();
2980 // Skip self-referential return types.
2981 const SourceManager &SM = getASTContext().getSourceManager();
2982 SourceRange RTRange = FTL.getReturnLoc().getSourceRange();
2983 SourceLocation Boundary = getNameInfo().getLocStart();
2984 if (RTRange.isInvalid() || Boundary.isInvalid() ||
2985 !SM.isBeforeInTranslationUnit(RTRange.getEnd(), Boundary))
2986 return SourceRange();
2991 SourceRange FunctionDecl::getExceptionSpecSourceRange() const {
2992 const TypeSourceInfo *TSI = getTypeSourceInfo();
2994 return SourceRange();
2995 FunctionTypeLoc FTL =
2996 TSI->getTypeLoc().IgnoreParens().getAs<FunctionTypeLoc>();
2998 return SourceRange();
3000 return FTL.getExceptionSpecRange();
3003 const Attr *FunctionDecl::getUnusedResultAttr() const {
3004 QualType RetType = getReturnType();
3005 if (RetType->isRecordType()) {
3006 if (const CXXRecordDecl *Ret = RetType->getAsCXXRecordDecl()) {
3007 if (const auto *R = Ret->getAttr<WarnUnusedResultAttr>())
3010 } else if (const auto *ET = RetType->getAs<EnumType>()) {
3011 if (const EnumDecl *ED = ET->getDecl()) {
3012 if (const auto *R = ED->getAttr<WarnUnusedResultAttr>())
3016 return getAttr<WarnUnusedResultAttr>();
3019 /// \brief For an inline function definition in C, or for a gnu_inline function
3020 /// in C++, determine whether the definition will be externally visible.
3022 /// Inline function definitions are always available for inlining optimizations.
3023 /// However, depending on the language dialect, declaration specifiers, and
3024 /// attributes, the definition of an inline function may or may not be
3025 /// "externally" visible to other translation units in the program.
3027 /// In C99, inline definitions are not externally visible by default. However,
3028 /// if even one of the global-scope declarations is marked "extern inline", the
3029 /// inline definition becomes externally visible (C99 6.7.4p6).
3031 /// In GNU89 mode, or if the gnu_inline attribute is attached to the function
3032 /// definition, we use the GNU semantics for inline, which are nearly the
3033 /// opposite of C99 semantics. In particular, "inline" by itself will create
3034 /// an externally visible symbol, but "extern inline" will not create an
3035 /// externally visible symbol.
3036 bool FunctionDecl::isInlineDefinitionExternallyVisible() const {
3037 assert((doesThisDeclarationHaveABody() || willHaveBody()) &&
3038 "Must be a function definition");
3039 assert(isInlined() && "Function must be inline");
3040 ASTContext &Context = getASTContext();
3042 if (Context.getLangOpts().GNUInline || hasAttr<GNUInlineAttr>()) {
3043 // Note: If you change the logic here, please change
3044 // doesDeclarationForceExternallyVisibleDefinition as well.
3046 // If it's not the case that both 'inline' and 'extern' are
3047 // specified on the definition, then this inline definition is
3048 // externally visible.
3049 if (!(isInlineSpecified() && getStorageClass() == SC_Extern))
3052 // If any declaration is 'inline' but not 'extern', then this definition
3053 // is externally visible.
3054 for (auto Redecl : redecls()) {
3055 if (Redecl->isInlineSpecified() &&
3056 Redecl->getStorageClass() != SC_Extern)
3063 // The rest of this function is C-only.
3064 assert(!Context.getLangOpts().CPlusPlus &&
3065 "should not use C inline rules in C++");
3068 // [...] If all of the file scope declarations for a function in a
3069 // translation unit include the inline function specifier without extern,
3070 // then the definition in that translation unit is an inline definition.
3071 for (auto Redecl : redecls()) {
3072 if (RedeclForcesDefC99(Redecl))
3077 // An inline definition does not provide an external definition for the
3078 // function, and does not forbid an external definition in another
3079 // translation unit.
3083 /// getOverloadedOperator - Which C++ overloaded operator this
3084 /// function represents, if any.
3085 OverloadedOperatorKind FunctionDecl::getOverloadedOperator() const {
3086 if (getDeclName().getNameKind() == DeclarationName::CXXOperatorName)
3087 return getDeclName().getCXXOverloadedOperator();
3092 /// getLiteralIdentifier - The literal suffix identifier this function
3093 /// represents, if any.
3094 const IdentifierInfo *FunctionDecl::getLiteralIdentifier() const {
3095 if (getDeclName().getNameKind() == DeclarationName::CXXLiteralOperatorName)
3096 return getDeclName().getCXXLiteralIdentifier();
3101 FunctionDecl::TemplatedKind FunctionDecl::getTemplatedKind() const {
3102 if (TemplateOrSpecialization.isNull())
3103 return TK_NonTemplate;
3104 if (TemplateOrSpecialization.is<FunctionTemplateDecl *>())
3105 return TK_FunctionTemplate;
3106 if (TemplateOrSpecialization.is<MemberSpecializationInfo *>())
3107 return TK_MemberSpecialization;
3108 if (TemplateOrSpecialization.is<FunctionTemplateSpecializationInfo *>())
3109 return TK_FunctionTemplateSpecialization;
3110 if (TemplateOrSpecialization.is
3111 <DependentFunctionTemplateSpecializationInfo*>())
3112 return TK_DependentFunctionTemplateSpecialization;
3114 llvm_unreachable("Did we miss a TemplateOrSpecialization type?");
3117 FunctionDecl *FunctionDecl::getInstantiatedFromMemberFunction() const {
3118 if (MemberSpecializationInfo *Info = getMemberSpecializationInfo())
3119 return cast<FunctionDecl>(Info->getInstantiatedFrom());
3124 MemberSpecializationInfo *FunctionDecl::getMemberSpecializationInfo() const {
3125 return TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>();
3129 FunctionDecl::setInstantiationOfMemberFunction(ASTContext &C,
3131 TemplateSpecializationKind TSK) {
3132 assert(TemplateOrSpecialization.isNull() &&
3133 "Member function is already a specialization");
3134 MemberSpecializationInfo *Info
3135 = new (C) MemberSpecializationInfo(FD, TSK);
3136 TemplateOrSpecialization = Info;
3139 FunctionTemplateDecl *FunctionDecl::getDescribedFunctionTemplate() const {
3140 return TemplateOrSpecialization.dyn_cast<FunctionTemplateDecl *>();
3143 void FunctionDecl::setDescribedFunctionTemplate(FunctionTemplateDecl *Template) {
3144 TemplateOrSpecialization = Template;
3147 bool FunctionDecl::isImplicitlyInstantiable() const {
3148 // If the function is invalid, it can't be implicitly instantiated.
3149 if (isInvalidDecl())
3152 switch (getTemplateSpecializationKind()) {
3153 case TSK_Undeclared:
3154 case TSK_ExplicitInstantiationDefinition:
3157 case TSK_ImplicitInstantiation:
3160 // It is possible to instantiate TSK_ExplicitSpecialization kind
3161 // if the FunctionDecl has a class scope specialization pattern.
3162 case TSK_ExplicitSpecialization:
3163 return getClassScopeSpecializationPattern() != nullptr;
3165 case TSK_ExplicitInstantiationDeclaration:
3170 // Find the actual template from which we will instantiate.
3171 const FunctionDecl *PatternDecl = getTemplateInstantiationPattern();
3172 bool HasPattern = false;
3174 HasPattern = PatternDecl->hasBody(PatternDecl);
3176 // C++0x [temp.explicit]p9:
3177 // Except for inline functions, other explicit instantiation declarations
3178 // have the effect of suppressing the implicit instantiation of the entity
3179 // to which they refer.
3180 if (!HasPattern || !PatternDecl)
3183 return PatternDecl->isInlined();
3186 bool FunctionDecl::isTemplateInstantiation() const {
3187 switch (getTemplateSpecializationKind()) {
3188 case TSK_Undeclared:
3189 case TSK_ExplicitSpecialization:
3191 case TSK_ImplicitInstantiation:
3192 case TSK_ExplicitInstantiationDeclaration:
3193 case TSK_ExplicitInstantiationDefinition:
3196 llvm_unreachable("All TSK values handled.");
3199 FunctionDecl *FunctionDecl::getTemplateInstantiationPattern() const {
3200 // Handle class scope explicit specialization special case.
3201 if (getTemplateSpecializationKind() == TSK_ExplicitSpecialization)
3202 return getClassScopeSpecializationPattern();
3204 // If this is a generic lambda call operator specialization, its
3205 // instantiation pattern is always its primary template's pattern
3206 // even if its primary template was instantiated from another
3207 // member template (which happens with nested generic lambdas).
3208 // Since a lambda's call operator's body is transformed eagerly,
3209 // we don't have to go hunting for a prototype definition template
3210 // (i.e. instantiated-from-member-template) to use as an instantiation
3213 if (isGenericLambdaCallOperatorSpecialization(
3214 dyn_cast<CXXMethodDecl>(this))) {
3215 assert(getPrimaryTemplate() && "A generic lambda specialization must be "
3216 "generated from a primary call operator "
3218 assert(getPrimaryTemplate()->getTemplatedDecl()->getBody() &&
3219 "A generic lambda call operator template must always have a body - "
3220 "even if instantiated from a prototype (i.e. as written) member "
3222 return getPrimaryTemplate()->getTemplatedDecl();
3225 if (FunctionTemplateDecl *Primary = getPrimaryTemplate()) {
3226 while (Primary->getInstantiatedFromMemberTemplate()) {
3227 // If we have hit a point where the user provided a specialization of
3228 // this template, we're done looking.
3229 if (Primary->isMemberSpecialization())
3231 Primary = Primary->getInstantiatedFromMemberTemplate();
3234 return Primary->getTemplatedDecl();
3237 return getInstantiatedFromMemberFunction();
3240 FunctionTemplateDecl *FunctionDecl::getPrimaryTemplate() const {
3241 if (FunctionTemplateSpecializationInfo *Info
3242 = TemplateOrSpecialization
3243 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3244 return Info->Template.getPointer();
3249 FunctionDecl *FunctionDecl::getClassScopeSpecializationPattern() const {
3250 return getASTContext().getClassScopeSpecializationPattern(this);
3253 FunctionTemplateSpecializationInfo *
3254 FunctionDecl::getTemplateSpecializationInfo() const {
3255 return TemplateOrSpecialization
3256 .dyn_cast<FunctionTemplateSpecializationInfo *>();
3259 const TemplateArgumentList *
3260 FunctionDecl::getTemplateSpecializationArgs() const {
3261 if (FunctionTemplateSpecializationInfo *Info
3262 = TemplateOrSpecialization
3263 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3264 return Info->TemplateArguments;
3269 const ASTTemplateArgumentListInfo *
3270 FunctionDecl::getTemplateSpecializationArgsAsWritten() const {
3271 if (FunctionTemplateSpecializationInfo *Info
3272 = TemplateOrSpecialization
3273 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3274 return Info->TemplateArgumentsAsWritten;
3280 FunctionDecl::setFunctionTemplateSpecialization(ASTContext &C,
3281 FunctionTemplateDecl *Template,
3282 const TemplateArgumentList *TemplateArgs,
3284 TemplateSpecializationKind TSK,
3285 const TemplateArgumentListInfo *TemplateArgsAsWritten,
3286 SourceLocation PointOfInstantiation) {
3287 assert(TSK != TSK_Undeclared &&
3288 "Must specify the type of function template specialization");
3289 FunctionTemplateSpecializationInfo *Info
3290 = TemplateOrSpecialization.dyn_cast<FunctionTemplateSpecializationInfo*>();
3292 Info = FunctionTemplateSpecializationInfo::Create(C, this, Template, TSK,
3294 TemplateArgsAsWritten,
3295 PointOfInstantiation);
3296 TemplateOrSpecialization = Info;
3297 Template->addSpecialization(Info, InsertPos);
3301 FunctionDecl::setDependentTemplateSpecialization(ASTContext &Context,
3302 const UnresolvedSetImpl &Templates,
3303 const TemplateArgumentListInfo &TemplateArgs) {
3304 assert(TemplateOrSpecialization.isNull());
3305 DependentFunctionTemplateSpecializationInfo *Info =
3306 DependentFunctionTemplateSpecializationInfo::Create(Context, Templates,
3308 TemplateOrSpecialization = Info;
3311 DependentFunctionTemplateSpecializationInfo *
3312 FunctionDecl::getDependentSpecializationInfo() const {
3313 return TemplateOrSpecialization
3314 .dyn_cast<DependentFunctionTemplateSpecializationInfo *>();
3317 DependentFunctionTemplateSpecializationInfo *
3318 DependentFunctionTemplateSpecializationInfo::Create(
3319 ASTContext &Context, const UnresolvedSetImpl &Ts,
3320 const TemplateArgumentListInfo &TArgs) {
3321 void *Buffer = Context.Allocate(
3322 totalSizeToAlloc<TemplateArgumentLoc, FunctionTemplateDecl *>(
3323 TArgs.size(), Ts.size()));
3324 return new (Buffer) DependentFunctionTemplateSpecializationInfo(Ts, TArgs);
3327 DependentFunctionTemplateSpecializationInfo::
3328 DependentFunctionTemplateSpecializationInfo(const UnresolvedSetImpl &Ts,
3329 const TemplateArgumentListInfo &TArgs)
3330 : AngleLocs(TArgs.getLAngleLoc(), TArgs.getRAngleLoc()) {
3332 NumTemplates = Ts.size();
3333 NumArgs = TArgs.size();
3335 FunctionTemplateDecl **TsArray = getTrailingObjects<FunctionTemplateDecl *>();
3336 for (unsigned I = 0, E = Ts.size(); I != E; ++I)
3337 TsArray[I] = cast<FunctionTemplateDecl>(Ts[I]->getUnderlyingDecl());
3339 TemplateArgumentLoc *ArgsArray = getTrailingObjects<TemplateArgumentLoc>();
3340 for (unsigned I = 0, E = TArgs.size(); I != E; ++I)
3341 new (&ArgsArray[I]) TemplateArgumentLoc(TArgs[I]);
3344 TemplateSpecializationKind FunctionDecl::getTemplateSpecializationKind() const {
3345 // For a function template specialization, query the specialization
3346 // information object.
3347 FunctionTemplateSpecializationInfo *FTSInfo
3348 = TemplateOrSpecialization.dyn_cast<FunctionTemplateSpecializationInfo*>();
3350 return FTSInfo->getTemplateSpecializationKind();
3352 MemberSpecializationInfo *MSInfo
3353 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>();
3355 return MSInfo->getTemplateSpecializationKind();
3357 return TSK_Undeclared;
3361 FunctionDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
3362 SourceLocation PointOfInstantiation) {
3363 if (FunctionTemplateSpecializationInfo *FTSInfo
3364 = TemplateOrSpecialization.dyn_cast<
3365 FunctionTemplateSpecializationInfo*>()) {
3366 FTSInfo->setTemplateSpecializationKind(TSK);
3367 if (TSK != TSK_ExplicitSpecialization &&
3368 PointOfInstantiation.isValid() &&
3369 FTSInfo->getPointOfInstantiation().isInvalid())
3370 FTSInfo->setPointOfInstantiation(PointOfInstantiation);
3371 } else if (MemberSpecializationInfo *MSInfo
3372 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>()) {
3373 MSInfo->setTemplateSpecializationKind(TSK);
3374 if (TSK != TSK_ExplicitSpecialization &&
3375 PointOfInstantiation.isValid() &&
3376 MSInfo->getPointOfInstantiation().isInvalid())
3377 MSInfo->setPointOfInstantiation(PointOfInstantiation);
3379 llvm_unreachable("Function cannot have a template specialization kind");
3382 SourceLocation FunctionDecl::getPointOfInstantiation() const {
3383 if (FunctionTemplateSpecializationInfo *FTSInfo
3384 = TemplateOrSpecialization.dyn_cast<
3385 FunctionTemplateSpecializationInfo*>())
3386 return FTSInfo->getPointOfInstantiation();
3387 else if (MemberSpecializationInfo *MSInfo
3388 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>())
3389 return MSInfo->getPointOfInstantiation();
3391 return SourceLocation();
3394 bool FunctionDecl::isOutOfLine() const {
3395 if (Decl::isOutOfLine())
3398 // If this function was instantiated from a member function of a
3399 // class template, check whether that member function was defined out-of-line.
3400 if (FunctionDecl *FD = getInstantiatedFromMemberFunction()) {
3401 const FunctionDecl *Definition;
3402 if (FD->hasBody(Definition))
3403 return Definition->isOutOfLine();
3406 // If this function was instantiated from a function template,
3407 // check whether that function template was defined out-of-line.
3408 if (FunctionTemplateDecl *FunTmpl = getPrimaryTemplate()) {
3409 const FunctionDecl *Definition;
3410 if (FunTmpl->getTemplatedDecl()->hasBody(Definition))
3411 return Definition->isOutOfLine();
3417 SourceRange FunctionDecl::getSourceRange() const {
3418 return SourceRange(getOuterLocStart(), EndRangeLoc);
3421 unsigned FunctionDecl::getMemoryFunctionKind() const {
3422 IdentifierInfo *FnInfo = getIdentifier();
3427 // Builtin handling.
3428 switch (getBuiltinID()) {
3429 case Builtin::BI__builtin_memset:
3430 case Builtin::BI__builtin___memset_chk:
3431 case Builtin::BImemset:
3432 return Builtin::BImemset;
3434 case Builtin::BI__builtin_memcpy:
3435 case Builtin::BI__builtin___memcpy_chk:
3436 case Builtin::BImemcpy:
3437 return Builtin::BImemcpy;
3439 case Builtin::BI__builtin_memmove:
3440 case Builtin::BI__builtin___memmove_chk:
3441 case Builtin::BImemmove:
3442 return Builtin::BImemmove;
3444 case Builtin::BIstrlcpy:
3445 case Builtin::BI__builtin___strlcpy_chk:
3446 return Builtin::BIstrlcpy;
3448 case Builtin::BIstrlcat:
3449 case Builtin::BI__builtin___strlcat_chk:
3450 return Builtin::BIstrlcat;
3452 case Builtin::BI__builtin_memcmp:
3453 case Builtin::BImemcmp:
3454 return Builtin::BImemcmp;
3456 case Builtin::BI__builtin_strncpy:
3457 case Builtin::BI__builtin___strncpy_chk:
3458 case Builtin::BIstrncpy:
3459 return Builtin::BIstrncpy;
3461 case Builtin::BI__builtin_strncmp:
3462 case Builtin::BIstrncmp:
3463 return Builtin::BIstrncmp;
3465 case Builtin::BI__builtin_strncasecmp:
3466 case Builtin::BIstrncasecmp:
3467 return Builtin::BIstrncasecmp;
3469 case Builtin::BI__builtin_strncat:
3470 case Builtin::BI__builtin___strncat_chk:
3471 case Builtin::BIstrncat:
3472 return Builtin::BIstrncat;
3474 case Builtin::BI__builtin_strndup:
3475 case Builtin::BIstrndup:
3476 return Builtin::BIstrndup;
3478 case Builtin::BI__builtin_strlen:
3479 case Builtin::BIstrlen:
3480 return Builtin::BIstrlen;
3482 case Builtin::BI__builtin_bzero:
3483 case Builtin::BIbzero:
3484 return Builtin::BIbzero;
3488 if (FnInfo->isStr("memset"))
3489 return Builtin::BImemset;
3490 else if (FnInfo->isStr("memcpy"))
3491 return Builtin::BImemcpy;
3492 else if (FnInfo->isStr("memmove"))
3493 return Builtin::BImemmove;
3494 else if (FnInfo->isStr("memcmp"))
3495 return Builtin::BImemcmp;
3496 else if (FnInfo->isStr("strncpy"))
3497 return Builtin::BIstrncpy;
3498 else if (FnInfo->isStr("strncmp"))
3499 return Builtin::BIstrncmp;
3500 else if (FnInfo->isStr("strncasecmp"))
3501 return Builtin::BIstrncasecmp;
3502 else if (FnInfo->isStr("strncat"))
3503 return Builtin::BIstrncat;
3504 else if (FnInfo->isStr("strndup"))
3505 return Builtin::BIstrndup;
3506 else if (FnInfo->isStr("strlen"))
3507 return Builtin::BIstrlen;
3508 else if (FnInfo->isStr("bzero"))
3509 return Builtin::BIbzero;
3516 //===----------------------------------------------------------------------===//
3517 // FieldDecl Implementation
3518 //===----------------------------------------------------------------------===//
3520 FieldDecl *FieldDecl::Create(const ASTContext &C, DeclContext *DC,
3521 SourceLocation StartLoc, SourceLocation IdLoc,
3522 IdentifierInfo *Id, QualType T,
3523 TypeSourceInfo *TInfo, Expr *BW, bool Mutable,
3524 InClassInitStyle InitStyle) {
3525 return new (C, DC) FieldDecl(Decl::Field, DC, StartLoc, IdLoc, Id, T, TInfo,
3526 BW, Mutable, InitStyle);
3529 FieldDecl *FieldDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
3530 return new (C, ID) FieldDecl(Field, nullptr, SourceLocation(),
3531 SourceLocation(), nullptr, QualType(), nullptr,
3532 nullptr, false, ICIS_NoInit);
3535 bool FieldDecl::isAnonymousStructOrUnion() const {
3536 if (!isImplicit() || getDeclName())
3539 if (const auto *Record = getType()->getAs<RecordType>())
3540 return Record->getDecl()->isAnonymousStructOrUnion();
3545 unsigned FieldDecl::getBitWidthValue(const ASTContext &Ctx) const {
3546 assert(isBitField() && "not a bitfield");
3547 auto *BitWidth = static_cast<Expr *>(InitStorage.getPointer());
3548 return BitWidth->EvaluateKnownConstInt(Ctx).getZExtValue();
3551 unsigned FieldDecl::getFieldIndex() const {
3552 const FieldDecl *Canonical = getCanonicalDecl();
3553 if (Canonical != this)
3554 return Canonical->getFieldIndex();
3556 if (CachedFieldIndex) return CachedFieldIndex - 1;
3559 const RecordDecl *RD = getParent();
3561 for (auto *Field : RD->fields()) {
3562 Field->getCanonicalDecl()->CachedFieldIndex = Index + 1;
3566 assert(CachedFieldIndex && "failed to find field in parent");
3567 return CachedFieldIndex - 1;
3570 SourceRange FieldDecl::getSourceRange() const {
3571 switch (InitStorage.getInt()) {
3572 // All three of these cases store an optional Expr*.
3573 case ISK_BitWidthOrNothing:
3574 case ISK_InClassCopyInit:
3575 case ISK_InClassListInit:
3576 if (const auto *E = static_cast<const Expr *>(InitStorage.getPointer()))
3577 return SourceRange(getInnerLocStart(), E->getLocEnd());
3580 case ISK_CapturedVLAType:
3581 return DeclaratorDecl::getSourceRange();
3583 llvm_unreachable("bad init storage kind");
3586 void FieldDecl::setCapturedVLAType(const VariableArrayType *VLAType) {
3587 assert((getParent()->isLambda() || getParent()->isCapturedRecord()) &&
3588 "capturing type in non-lambda or captured record.");
3589 assert(InitStorage.getInt() == ISK_BitWidthOrNothing &&
3590 InitStorage.getPointer() == nullptr &&
3591 "bit width, initializer or captured type already set");
3592 InitStorage.setPointerAndInt(const_cast<VariableArrayType *>(VLAType),
3593 ISK_CapturedVLAType);
3596 //===----------------------------------------------------------------------===//
3597 // TagDecl Implementation
3598 //===----------------------------------------------------------------------===//
3600 SourceLocation TagDecl::getOuterLocStart() const {
3601 return getTemplateOrInnerLocStart(this);
3604 SourceRange TagDecl::getSourceRange() const {
3605 SourceLocation RBraceLoc = BraceRange.getEnd();
3606 SourceLocation E = RBraceLoc.isValid() ? RBraceLoc : getLocation();
3607 return SourceRange(getOuterLocStart(), E);
3610 TagDecl *TagDecl::getCanonicalDecl() { return getFirstDecl(); }
3612 void TagDecl::setTypedefNameForAnonDecl(TypedefNameDecl *TDD) {
3613 TypedefNameDeclOrQualifier = TDD;
3614 if (const Type *T = getTypeForDecl()) {
3616 assert(T->isLinkageValid());
3618 assert(isLinkageValid());
3621 void TagDecl::startDefinition() {
3622 IsBeingDefined = true;
3624 if (auto *D = dyn_cast<CXXRecordDecl>(this)) {
3625 struct CXXRecordDecl::DefinitionData *Data =
3626 new (getASTContext()) struct CXXRecordDecl::DefinitionData(D);
3627 for (auto I : redecls())
3628 cast<CXXRecordDecl>(I)->DefinitionData = Data;
3632 void TagDecl::completeDefinition() {
3633 assert((!isa<CXXRecordDecl>(this) ||
3634 cast<CXXRecordDecl>(this)->hasDefinition()) &&
3635 "definition completed but not started");
3637 IsCompleteDefinition = true;
3638 IsBeingDefined = false;
3640 if (ASTMutationListener *L = getASTMutationListener())
3641 L->CompletedTagDefinition(this);
3644 TagDecl *TagDecl::getDefinition() const {
3645 if (isCompleteDefinition())
3646 return const_cast<TagDecl *>(this);
3648 // If it's possible for us to have an out-of-date definition, check now.
3649 if (MayHaveOutOfDateDef) {
3650 if (IdentifierInfo *II = getIdentifier()) {
3651 if (II->isOutOfDate()) {
3652 updateOutOfDate(*II);
3657 if (const auto *CXXRD = dyn_cast<CXXRecordDecl>(this))
3658 return CXXRD->getDefinition();
3660 for (auto R : redecls())
3661 if (R->isCompleteDefinition())
3667 void TagDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) {
3669 // Make sure the extended qualifier info is allocated.
3671 TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo;
3672 // Set qualifier info.
3673 getExtInfo()->QualifierLoc = QualifierLoc;
3675 // Here Qualifier == 0, i.e., we are removing the qualifier (if any).
3677 if (getExtInfo()->NumTemplParamLists == 0) {
3678 getASTContext().Deallocate(getExtInfo());
3679 TypedefNameDeclOrQualifier = (TypedefNameDecl *)nullptr;
3682 getExtInfo()->QualifierLoc = QualifierLoc;
3687 void TagDecl::setTemplateParameterListsInfo(
3688 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
3689 assert(!TPLists.empty());
3690 // Make sure the extended decl info is allocated.
3692 // Allocate external info struct.
3693 TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo;
3694 // Set the template parameter lists info.
3695 getExtInfo()->setTemplateParameterListsInfo(Context, TPLists);
3698 //===----------------------------------------------------------------------===//
3699 // EnumDecl Implementation
3700 //===----------------------------------------------------------------------===//
3702 void EnumDecl::anchor() { }
3704 EnumDecl *EnumDecl::Create(ASTContext &C, DeclContext *DC,
3705 SourceLocation StartLoc, SourceLocation IdLoc,
3707 EnumDecl *PrevDecl, bool IsScoped,
3708 bool IsScopedUsingClassTag, bool IsFixed) {
3709 auto *Enum = new (C, DC) EnumDecl(C, DC, StartLoc, IdLoc, Id, PrevDecl,
3710 IsScoped, IsScopedUsingClassTag, IsFixed);
3711 Enum->MayHaveOutOfDateDef = C.getLangOpts().Modules;
3712 C.getTypeDeclType(Enum, PrevDecl);
3716 EnumDecl *EnumDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
3718 new (C, ID) EnumDecl(C, nullptr, SourceLocation(), SourceLocation(),
3719 nullptr, nullptr, false, false, false);
3720 Enum->MayHaveOutOfDateDef = C.getLangOpts().Modules;
3724 SourceRange EnumDecl::getIntegerTypeRange() const {
3725 if (const TypeSourceInfo *TI = getIntegerTypeSourceInfo())
3726 return TI->getTypeLoc().getSourceRange();
3727 return SourceRange();
3730 void EnumDecl::completeDefinition(QualType NewType,
3731 QualType NewPromotionType,
3732 unsigned NumPositiveBits,
3733 unsigned NumNegativeBits) {
3734 assert(!isCompleteDefinition() && "Cannot redefine enums!");
3736 IntegerType = NewType.getTypePtr();
3737 PromotionType = NewPromotionType;
3738 setNumPositiveBits(NumPositiveBits);
3739 setNumNegativeBits(NumNegativeBits);
3740 TagDecl::completeDefinition();
3743 bool EnumDecl::isClosed() const {
3744 if (const auto *A = getAttr<EnumExtensibilityAttr>())
3745 return A->getExtensibility() == EnumExtensibilityAttr::Closed;
3749 bool EnumDecl::isClosedFlag() const {
3750 return isClosed() && hasAttr<FlagEnumAttr>();
3753 bool EnumDecl::isClosedNonFlag() const {
3754 return isClosed() && !hasAttr<FlagEnumAttr>();
3757 TemplateSpecializationKind EnumDecl::getTemplateSpecializationKind() const {
3758 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
3759 return MSI->getTemplateSpecializationKind();
3761 return TSK_Undeclared;
3764 void EnumDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
3765 SourceLocation PointOfInstantiation) {
3766 MemberSpecializationInfo *MSI = getMemberSpecializationInfo();
3767 assert(MSI && "Not an instantiated member enumeration?");
3768 MSI->setTemplateSpecializationKind(TSK);
3769 if (TSK != TSK_ExplicitSpecialization &&
3770 PointOfInstantiation.isValid() &&
3771 MSI->getPointOfInstantiation().isInvalid())
3772 MSI->setPointOfInstantiation(PointOfInstantiation);
3775 EnumDecl *EnumDecl::getTemplateInstantiationPattern() const {
3776 if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo()) {
3777 if (isTemplateInstantiation(MSInfo->getTemplateSpecializationKind())) {
3778 EnumDecl *ED = getInstantiatedFromMemberEnum();
3779 while (auto *NewED = ED->getInstantiatedFromMemberEnum())
3785 assert(!isTemplateInstantiation(getTemplateSpecializationKind()) &&
3786 "couldn't find pattern for enum instantiation");
3790 EnumDecl *EnumDecl::getInstantiatedFromMemberEnum() const {
3791 if (SpecializationInfo)
3792 return cast<EnumDecl>(SpecializationInfo->getInstantiatedFrom());
3797 void EnumDecl::setInstantiationOfMemberEnum(ASTContext &C, EnumDecl *ED,
3798 TemplateSpecializationKind TSK) {
3799 assert(!SpecializationInfo && "Member enum is already a specialization");
3800 SpecializationInfo = new (C) MemberSpecializationInfo(ED, TSK);
3803 //===----------------------------------------------------------------------===//
3804 // RecordDecl Implementation
3805 //===----------------------------------------------------------------------===//
3807 RecordDecl::RecordDecl(Kind DK, TagKind TK, const ASTContext &C,
3808 DeclContext *DC, SourceLocation StartLoc,
3809 SourceLocation IdLoc, IdentifierInfo *Id,
3810 RecordDecl *PrevDecl)
3811 : TagDecl(DK, TK, C, DC, IdLoc, Id, PrevDecl, StartLoc) {
3812 HasFlexibleArrayMember = false;
3813 AnonymousStructOrUnion = false;
3814 HasObjectMember = false;
3815 HasVolatileMember = false;
3816 LoadedFieldsFromExternalStorage = false;
3817 assert(classof(static_cast<Decl*>(this)) && "Invalid Kind!");
3820 RecordDecl *RecordDecl::Create(const ASTContext &C, TagKind TK, DeclContext *DC,
3821 SourceLocation StartLoc, SourceLocation IdLoc,
3822 IdentifierInfo *Id, RecordDecl* PrevDecl) {
3823 RecordDecl *R = new (C, DC) RecordDecl(Record, TK, C, DC,
3824 StartLoc, IdLoc, Id, PrevDecl);
3825 R->MayHaveOutOfDateDef = C.getLangOpts().Modules;
3827 C.getTypeDeclType(R, PrevDecl);
3831 RecordDecl *RecordDecl::CreateDeserialized(const ASTContext &C, unsigned ID) {
3833 new (C, ID) RecordDecl(Record, TTK_Struct, C, nullptr, SourceLocation(),
3834 SourceLocation(), nullptr, nullptr);
3835 R->MayHaveOutOfDateDef = C.getLangOpts().Modules;
3839 bool RecordDecl::isInjectedClassName() const {
3840 return isImplicit() && getDeclName() && getDeclContext()->isRecord() &&
3841 cast<RecordDecl>(getDeclContext())->getDeclName() == getDeclName();
3844 bool RecordDecl::isLambda() const {
3845 if (auto RD = dyn_cast<CXXRecordDecl>(this))
3846 return RD->isLambda();
3850 bool RecordDecl::isCapturedRecord() const {
3851 return hasAttr<CapturedRecordAttr>();
3854 void RecordDecl::setCapturedRecord() {
3855 addAttr(CapturedRecordAttr::CreateImplicit(getASTContext()));
3858 RecordDecl::field_iterator RecordDecl::field_begin() const {
3859 if (hasExternalLexicalStorage() && !LoadedFieldsFromExternalStorage)
3860 LoadFieldsFromExternalStorage();
3862 return field_iterator(decl_iterator(FirstDecl));
3865 /// completeDefinition - Notes that the definition of this type is now
3867 void RecordDecl::completeDefinition() {
3868 assert(!isCompleteDefinition() && "Cannot redefine record!");
3869 TagDecl::completeDefinition();
3872 /// isMsStruct - Get whether or not this record uses ms_struct layout.
3873 /// This which can be turned on with an attribute, pragma, or the
3874 /// -mms-bitfields command-line option.
3875 bool RecordDecl::isMsStruct(const ASTContext &C) const {
3876 return hasAttr<MSStructAttr>() || C.getLangOpts().MSBitfields == 1;
3879 void RecordDecl::LoadFieldsFromExternalStorage() const {
3880 ExternalASTSource *Source = getASTContext().getExternalSource();
3881 assert(hasExternalLexicalStorage() && Source && "No external storage?");
3883 // Notify that we have a RecordDecl doing some initialization.
3884 ExternalASTSource::Deserializing TheFields(Source);
3886 SmallVector<Decl*, 64> Decls;
3887 LoadedFieldsFromExternalStorage = true;
3888 Source->FindExternalLexicalDecls(this, [](Decl::Kind K) {
3889 return FieldDecl::classofKind(K) || IndirectFieldDecl::classofKind(K);
3893 // Check that all decls we got were FieldDecls.
3894 for (unsigned i=0, e=Decls.size(); i != e; ++i)
3895 assert(isa<FieldDecl>(Decls[i]) || isa<IndirectFieldDecl>(Decls[i]));
3901 std::tie(FirstDecl, LastDecl) = BuildDeclChain(Decls,
3902 /*FieldsAlreadyLoaded=*/false);
3905 bool RecordDecl::mayInsertExtraPadding(bool EmitRemark) const {
3906 ASTContext &Context = getASTContext();
3907 if (!Context.getLangOpts().Sanitize.hasOneOf(
3908 SanitizerKind::Address | SanitizerKind::KernelAddress) ||
3909 !Context.getLangOpts().SanitizeAddressFieldPadding)
3911 const auto &Blacklist = Context.getSanitizerBlacklist();
3912 const auto *CXXRD = dyn_cast<CXXRecordDecl>(this);
3913 // We may be able to relax some of these requirements.
3914 int ReasonToReject = -1;
3915 if (!CXXRD || CXXRD->isExternCContext())
3916 ReasonToReject = 0; // is not C++.
3917 else if (CXXRD->hasAttr<PackedAttr>())
3918 ReasonToReject = 1; // is packed.
3919 else if (CXXRD->isUnion())
3920 ReasonToReject = 2; // is a union.
3921 else if (CXXRD->isTriviallyCopyable())
3922 ReasonToReject = 3; // is trivially copyable.
3923 else if (CXXRD->hasTrivialDestructor())
3924 ReasonToReject = 4; // has trivial destructor.
3925 else if (CXXRD->isStandardLayout())
3926 ReasonToReject = 5; // is standard layout.
3927 else if (Blacklist.isBlacklistedLocation(getLocation(), "field-padding"))
3928 ReasonToReject = 6; // is in a blacklisted file.
3929 else if (Blacklist.isBlacklistedType(getQualifiedNameAsString(),
3931 ReasonToReject = 7; // is blacklisted.
3934 if (ReasonToReject >= 0)
3935 Context.getDiagnostics().Report(
3937 diag::remark_sanitize_address_insert_extra_padding_rejected)
3938 << getQualifiedNameAsString() << ReasonToReject;
3940 Context.getDiagnostics().Report(
3942 diag::remark_sanitize_address_insert_extra_padding_accepted)
3943 << getQualifiedNameAsString();
3945 return ReasonToReject < 0;
3948 const FieldDecl *RecordDecl::findFirstNamedDataMember() const {
3949 for (const auto *I : fields()) {
3950 if (I->getIdentifier())
3953 if (const auto *RT = I->getType()->getAs<RecordType>())
3954 if (const FieldDecl *NamedDataMember =
3955 RT->getDecl()->findFirstNamedDataMember())
3956 return NamedDataMember;
3959 // We didn't find a named data member.
3964 //===----------------------------------------------------------------------===//
3965 // BlockDecl Implementation
3966 //===----------------------------------------------------------------------===//
3968 void BlockDecl::setParams(ArrayRef<ParmVarDecl *> NewParamInfo) {
3969 assert(!ParamInfo && "Already has param info!");
3971 // Zero params -> null pointer.
3972 if (!NewParamInfo.empty()) {
3973 NumParams = NewParamInfo.size();
3974 ParamInfo = new (getASTContext()) ParmVarDecl*[NewParamInfo.size()];
3975 std::copy(NewParamInfo.begin(), NewParamInfo.end(), ParamInfo);
3979 void BlockDecl::setCaptures(ASTContext &Context, ArrayRef<Capture> Captures,
3980 bool CapturesCXXThis) {
3981 this->CapturesCXXThis = CapturesCXXThis;
3982 this->NumCaptures = Captures.size();
3984 if (Captures.empty()) {
3985 this->Captures = nullptr;
3989 this->Captures = Captures.copy(Context).data();
3992 bool BlockDecl::capturesVariable(const VarDecl *variable) const {
3993 for (const auto &I : captures())
3994 // Only auto vars can be captured, so no redeclaration worries.
3995 if (I.getVariable() == variable)
4001 SourceRange BlockDecl::getSourceRange() const {
4002 return SourceRange(getLocation(), Body? Body->getLocEnd() : getLocation());
4005 //===----------------------------------------------------------------------===//
4006 // Other Decl Allocation/Deallocation Method Implementations
4007 //===----------------------------------------------------------------------===//
4009 void TranslationUnitDecl::anchor() { }
4011 TranslationUnitDecl *TranslationUnitDecl::Create(ASTContext &C) {
4012 return new (C, (DeclContext *)nullptr) TranslationUnitDecl(C);
4015 void PragmaCommentDecl::anchor() { }
4017 PragmaCommentDecl *PragmaCommentDecl::Create(const ASTContext &C,
4018 TranslationUnitDecl *DC,
4019 SourceLocation CommentLoc,
4020 PragmaMSCommentKind CommentKind,
4022 PragmaCommentDecl *PCD =
4023 new (C, DC, additionalSizeToAlloc<char>(Arg.size() + 1))
4024 PragmaCommentDecl(DC, CommentLoc, CommentKind);
4025 memcpy(PCD->getTrailingObjects<char>(), Arg.data(), Arg.size());
4026 PCD->getTrailingObjects<char>()[Arg.size()] = '\0';
4030 PragmaCommentDecl *PragmaCommentDecl::CreateDeserialized(ASTContext &C,
4033 return new (C, ID, additionalSizeToAlloc<char>(ArgSize + 1))
4034 PragmaCommentDecl(nullptr, SourceLocation(), PCK_Unknown);
4037 void PragmaDetectMismatchDecl::anchor() { }
4039 PragmaDetectMismatchDecl *
4040 PragmaDetectMismatchDecl::Create(const ASTContext &C, TranslationUnitDecl *DC,
4041 SourceLocation Loc, StringRef Name,
4043 size_t ValueStart = Name.size() + 1;
4044 PragmaDetectMismatchDecl *PDMD =
4045 new (C, DC, additionalSizeToAlloc<char>(ValueStart + Value.size() + 1))
4046 PragmaDetectMismatchDecl(DC, Loc, ValueStart);
4047 memcpy(PDMD->getTrailingObjects<char>(), Name.data(), Name.size());
4048 PDMD->getTrailingObjects<char>()[Name.size()] = '\0';
4049 memcpy(PDMD->getTrailingObjects<char>() + ValueStart, Value.data(),
4051 PDMD->getTrailingObjects<char>()[ValueStart + Value.size()] = '\0';
4055 PragmaDetectMismatchDecl *
4056 PragmaDetectMismatchDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4057 unsigned NameValueSize) {
4058 return new (C, ID, additionalSizeToAlloc<char>(NameValueSize + 1))
4059 PragmaDetectMismatchDecl(nullptr, SourceLocation(), 0);
4062 void ExternCContextDecl::anchor() { }
4064 ExternCContextDecl *ExternCContextDecl::Create(const ASTContext &C,
4065 TranslationUnitDecl *DC) {
4066 return new (C, DC) ExternCContextDecl(DC);
4069 void LabelDecl::anchor() { }
4071 LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC,
4072 SourceLocation IdentL, IdentifierInfo *II) {
4073 return new (C, DC) LabelDecl(DC, IdentL, II, nullptr, IdentL);
4076 LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC,
4077 SourceLocation IdentL, IdentifierInfo *II,
4078 SourceLocation GnuLabelL) {
4079 assert(GnuLabelL != IdentL && "Use this only for GNU local labels");
4080 return new (C, DC) LabelDecl(DC, IdentL, II, nullptr, GnuLabelL);
4083 LabelDecl *LabelDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4084 return new (C, ID) LabelDecl(nullptr, SourceLocation(), nullptr, nullptr,
4088 void LabelDecl::setMSAsmLabel(StringRef Name) {
4089 char *Buffer = new (getASTContext(), 1) char[Name.size() + 1];
4090 memcpy(Buffer, Name.data(), Name.size());
4091 Buffer[Name.size()] = '\0';
4095 void ValueDecl::anchor() { }
4097 bool ValueDecl::isWeak() const {
4098 for (const auto *I : attrs())
4099 if (isa<WeakAttr>(I) || isa<WeakRefAttr>(I))
4102 return isWeakImported();
4105 void ImplicitParamDecl::anchor() { }
4107 ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, DeclContext *DC,
4108 SourceLocation IdLoc,
4111 return new (C, DC) ImplicitParamDecl(C, DC, IdLoc, Id, Type);
4114 ImplicitParamDecl *ImplicitParamDecl::CreateDeserialized(ASTContext &C,
4116 return new (C, ID) ImplicitParamDecl(C, nullptr, SourceLocation(), nullptr,
4120 FunctionDecl *FunctionDecl::Create(ASTContext &C, DeclContext *DC,
4121 SourceLocation StartLoc,
4122 const DeclarationNameInfo &NameInfo,
4123 QualType T, TypeSourceInfo *TInfo,
4125 bool isInlineSpecified,
4126 bool hasWrittenPrototype,
4127 bool isConstexprSpecified) {
4129 new (C, DC) FunctionDecl(Function, C, DC, StartLoc, NameInfo, T, TInfo,
4130 SC, isInlineSpecified, isConstexprSpecified);
4131 New->HasWrittenPrototype = hasWrittenPrototype;
4135 FunctionDecl *FunctionDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4136 return new (C, ID) FunctionDecl(Function, C, nullptr, SourceLocation(),
4137 DeclarationNameInfo(), QualType(), nullptr,
4138 SC_None, false, false);
4141 BlockDecl *BlockDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) {
4142 return new (C, DC) BlockDecl(DC, L);
4145 BlockDecl *BlockDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4146 return new (C, ID) BlockDecl(nullptr, SourceLocation());
4149 CapturedDecl::CapturedDecl(DeclContext *DC, unsigned NumParams)
4150 : Decl(Captured, DC, SourceLocation()), DeclContext(Captured),
4151 NumParams(NumParams), ContextParam(0), BodyAndNothrow(nullptr, false) {}
4153 CapturedDecl *CapturedDecl::Create(ASTContext &C, DeclContext *DC,
4154 unsigned NumParams) {
4155 return new (C, DC, additionalSizeToAlloc<ImplicitParamDecl *>(NumParams))
4156 CapturedDecl(DC, NumParams);
4159 CapturedDecl *CapturedDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4160 unsigned NumParams) {
4161 return new (C, ID, additionalSizeToAlloc<ImplicitParamDecl *>(NumParams))
4162 CapturedDecl(nullptr, NumParams);
4165 Stmt *CapturedDecl::getBody() const { return BodyAndNothrow.getPointer(); }
4166 void CapturedDecl::setBody(Stmt *B) { BodyAndNothrow.setPointer(B); }
4168 bool CapturedDecl::isNothrow() const { return BodyAndNothrow.getInt(); }
4169 void CapturedDecl::setNothrow(bool Nothrow) { BodyAndNothrow.setInt(Nothrow); }
4171 EnumConstantDecl *EnumConstantDecl::Create(ASTContext &C, EnumDecl *CD,
4173 IdentifierInfo *Id, QualType T,
4174 Expr *E, const llvm::APSInt &V) {
4175 return new (C, CD) EnumConstantDecl(CD, L, Id, T, E, V);
4179 EnumConstantDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4180 return new (C, ID) EnumConstantDecl(nullptr, SourceLocation(), nullptr,
4181 QualType(), nullptr, llvm::APSInt());
4184 void IndirectFieldDecl::anchor() { }
4186 IndirectFieldDecl::IndirectFieldDecl(ASTContext &C, DeclContext *DC,
4187 SourceLocation L, DeclarationName N,
4189 MutableArrayRef<NamedDecl *> CH)
4190 : ValueDecl(IndirectField, DC, L, N, T), Chaining(CH.data()),
4191 ChainingSize(CH.size()) {
4192 // In C++, indirect field declarations conflict with tag declarations in the
4193 // same scope, so add them to IDNS_Tag so that tag redeclaration finds them.
4194 if (C.getLangOpts().CPlusPlus)
4195 IdentifierNamespace |= IDNS_Tag;
4199 IndirectFieldDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L,
4200 IdentifierInfo *Id, QualType T,
4201 llvm::MutableArrayRef<NamedDecl *> CH) {
4202 return new (C, DC) IndirectFieldDecl(C, DC, L, Id, T, CH);
4205 IndirectFieldDecl *IndirectFieldDecl::CreateDeserialized(ASTContext &C,
4207 return new (C, ID) IndirectFieldDecl(C, nullptr, SourceLocation(),
4208 DeclarationName(), QualType(), None);
4211 SourceRange EnumConstantDecl::getSourceRange() const {
4212 SourceLocation End = getLocation();
4214 End = Init->getLocEnd();
4215 return SourceRange(getLocation(), End);
4218 void TypeDecl::anchor() { }
4220 TypedefDecl *TypedefDecl::Create(ASTContext &C, DeclContext *DC,
4221 SourceLocation StartLoc, SourceLocation IdLoc,
4222 IdentifierInfo *Id, TypeSourceInfo *TInfo) {
4223 return new (C, DC) TypedefDecl(C, DC, StartLoc, IdLoc, Id, TInfo);
4226 void TypedefNameDecl::anchor() { }
4228 TagDecl *TypedefNameDecl::getAnonDeclWithTypedefName(bool AnyRedecl) const {
4229 if (auto *TT = getTypeSourceInfo()->getType()->getAs<TagType>()) {
4230 auto *OwningTypedef = TT->getDecl()->getTypedefNameForAnonDecl();
4231 auto *ThisTypedef = this;
4232 if (AnyRedecl && OwningTypedef) {
4233 OwningTypedef = OwningTypedef->getCanonicalDecl();
4234 ThisTypedef = ThisTypedef->getCanonicalDecl();
4236 if (OwningTypedef == ThisTypedef)
4237 return TT->getDecl();
4243 bool TypedefNameDecl::isTransparentTagSlow() const {
4244 auto determineIsTransparent = [&]() {
4245 if (auto *TT = getUnderlyingType()->getAs<TagType>()) {
4246 if (auto *TD = TT->getDecl()) {
4247 if (TD->getName() != getName())
4249 SourceLocation TTLoc = getLocation();
4250 SourceLocation TDLoc = TD->getLocation();
4251 if (!TTLoc.isMacroID() || !TDLoc.isMacroID())
4253 SourceManager &SM = getASTContext().getSourceManager();
4254 return SM.getSpellingLoc(TTLoc) == SM.getSpellingLoc(TDLoc);
4260 bool isTransparent = determineIsTransparent();
4261 CacheIsTransparentTag = 1;
4263 CacheIsTransparentTag |= 0x2;
4264 return isTransparent;
4267 TypedefDecl *TypedefDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4268 return new (C, ID) TypedefDecl(C, nullptr, SourceLocation(), SourceLocation(),
4272 TypeAliasDecl *TypeAliasDecl::Create(ASTContext &C, DeclContext *DC,
4273 SourceLocation StartLoc,
4274 SourceLocation IdLoc, IdentifierInfo *Id,
4275 TypeSourceInfo *TInfo) {
4276 return new (C, DC) TypeAliasDecl(C, DC, StartLoc, IdLoc, Id, TInfo);
4279 TypeAliasDecl *TypeAliasDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4280 return new (C, ID) TypeAliasDecl(C, nullptr, SourceLocation(),
4281 SourceLocation(), nullptr, nullptr);
4284 SourceRange TypedefDecl::getSourceRange() const {
4285 SourceLocation RangeEnd = getLocation();
4286 if (TypeSourceInfo *TInfo = getTypeSourceInfo()) {
4287 if (typeIsPostfix(TInfo->getType()))
4288 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
4290 return SourceRange(getLocStart(), RangeEnd);
4293 SourceRange TypeAliasDecl::getSourceRange() const {
4294 SourceLocation RangeEnd = getLocStart();
4295 if (TypeSourceInfo *TInfo = getTypeSourceInfo())
4296 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
4297 return SourceRange(getLocStart(), RangeEnd);
4300 void FileScopeAsmDecl::anchor() { }
4302 FileScopeAsmDecl *FileScopeAsmDecl::Create(ASTContext &C, DeclContext *DC,
4304 SourceLocation AsmLoc,
4305 SourceLocation RParenLoc) {
4306 return new (C, DC) FileScopeAsmDecl(DC, Str, AsmLoc, RParenLoc);
4309 FileScopeAsmDecl *FileScopeAsmDecl::CreateDeserialized(ASTContext &C,
4311 return new (C, ID) FileScopeAsmDecl(nullptr, nullptr, SourceLocation(),
4315 void EmptyDecl::anchor() {}
4317 EmptyDecl *EmptyDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) {
4318 return new (C, DC) EmptyDecl(DC, L);
4321 EmptyDecl *EmptyDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4322 return new (C, ID) EmptyDecl(nullptr, SourceLocation());
4325 //===----------------------------------------------------------------------===//
4326 // ImportDecl Implementation
4327 //===----------------------------------------------------------------------===//
4329 /// \brief Retrieve the number of module identifiers needed to name the given
4331 static unsigned getNumModuleIdentifiers(Module *Mod) {
4332 unsigned Result = 1;
4333 while (Mod->Parent) {
4340 ImportDecl::ImportDecl(DeclContext *DC, SourceLocation StartLoc,
4342 ArrayRef<SourceLocation> IdentifierLocs)
4343 : Decl(Import, DC, StartLoc), ImportedAndComplete(Imported, true),
4346 assert(getNumModuleIdentifiers(Imported) == IdentifierLocs.size());
4347 auto *StoredLocs = getTrailingObjects<SourceLocation>();
4348 std::uninitialized_copy(IdentifierLocs.begin(), IdentifierLocs.end(),
4352 ImportDecl::ImportDecl(DeclContext *DC, SourceLocation StartLoc,
4353 Module *Imported, SourceLocation EndLoc)
4354 : Decl(Import, DC, StartLoc), ImportedAndComplete(Imported, false),
4357 *getTrailingObjects<SourceLocation>() = EndLoc;
4360 ImportDecl *ImportDecl::Create(ASTContext &C, DeclContext *DC,
4361 SourceLocation StartLoc, Module *Imported,
4362 ArrayRef<SourceLocation> IdentifierLocs) {
4364 additionalSizeToAlloc<SourceLocation>(IdentifierLocs.size()))
4365 ImportDecl(DC, StartLoc, Imported, IdentifierLocs);
4368 ImportDecl *ImportDecl::CreateImplicit(ASTContext &C, DeclContext *DC,
4369 SourceLocation StartLoc,
4371 SourceLocation EndLoc) {
4372 ImportDecl *Import = new (C, DC, additionalSizeToAlloc<SourceLocation>(1))
4373 ImportDecl(DC, StartLoc, Imported, EndLoc);
4374 Import->setImplicit();
4378 ImportDecl *ImportDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4379 unsigned NumLocations) {
4380 return new (C, ID, additionalSizeToAlloc<SourceLocation>(NumLocations))
4381 ImportDecl(EmptyShell());
4384 ArrayRef<SourceLocation> ImportDecl::getIdentifierLocs() const {
4385 if (!ImportedAndComplete.getInt())
4388 const auto *StoredLocs = getTrailingObjects<SourceLocation>();
4389 return llvm::makeArrayRef(StoredLocs,
4390 getNumModuleIdentifiers(getImportedModule()));
4393 SourceRange ImportDecl::getSourceRange() const {
4394 if (!ImportedAndComplete.getInt())
4395 return SourceRange(getLocation(), *getTrailingObjects<SourceLocation>());
4397 return SourceRange(getLocation(), getIdentifierLocs().back());
4400 //===----------------------------------------------------------------------===//
4401 // ExportDecl Implementation
4402 //===----------------------------------------------------------------------===//
4404 void ExportDecl::anchor() {}
4406 ExportDecl *ExportDecl::Create(ASTContext &C, DeclContext *DC,
4407 SourceLocation ExportLoc) {
4408 return new (C, DC) ExportDecl(DC, ExportLoc);
4411 ExportDecl *ExportDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4412 return new (C, ID) ExportDecl(nullptr, SourceLocation());