1//===- Decl.cpp - Declaration AST Node Implementation ---------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements the Decl subclasses.
10//
11//===----------------------------------------------------------------------===//
12
13#include "clang/AST/Decl.h"
14#include "Linkage.h"
15#include "clang/AST/ASTContext.h"
16#include "clang/AST/ASTDiagnostic.h"
17#include "clang/AST/ASTLambda.h"
18#include "clang/AST/ASTMutationListener.h"
19#include "clang/AST/Attr.h"
20#include "clang/AST/CanonicalType.h"
21#include "clang/AST/DeclBase.h"
22#include "clang/AST/DeclCXX.h"
23#include "clang/AST/DeclObjC.h"
24#include "clang/AST/DeclOpenMP.h"
25#include "clang/AST/DeclTemplate.h"
26#include "clang/AST/DeclarationName.h"
27#include "clang/AST/Expr.h"
28#include "clang/AST/ExprCXX.h"
29#include "clang/AST/ExternalASTSource.h"
30#include "clang/AST/ODRHash.h"
31#include "clang/AST/PrettyDeclStackTrace.h"
32#include "clang/AST/PrettyPrinter.h"
33#include "clang/AST/Randstruct.h"
34#include "clang/AST/RecordLayout.h"
35#include "clang/AST/Redeclarable.h"
36#include "clang/AST/Stmt.h"
37#include "clang/AST/TemplateBase.h"
38#include "clang/AST/Type.h"
39#include "clang/AST/TypeLoc.h"
40#include "clang/Basic/Builtins.h"
41#include "clang/Basic/IdentifierTable.h"
42#include "clang/Basic/LLVM.h"
43#include "clang/Basic/LangOptions.h"
44#include "clang/Basic/Linkage.h"
45#include "clang/Basic/Module.h"
46#include "clang/Basic/NoSanitizeList.h"
47#include "clang/Basic/PartialDiagnostic.h"
48#include "clang/Basic/Sanitizers.h"
49#include "clang/Basic/SourceLocation.h"
50#include "clang/Basic/SourceManager.h"
51#include "clang/Basic/Specifiers.h"
52#include "clang/Basic/TargetCXXABI.h"
53#include "clang/Basic/TargetInfo.h"
54#include "clang/Basic/Visibility.h"
55#include "llvm/ADT/APSInt.h"
56#include "llvm/ADT/ArrayRef.h"
57#include "llvm/ADT/STLExtras.h"
58#include "llvm/ADT/SmallVector.h"
59#include "llvm/ADT/StringRef.h"
60#include "llvm/ADT/StringSwitch.h"
61#include "llvm/Support/Casting.h"
62#include "llvm/Support/ErrorHandling.h"
63#include "llvm/Support/raw_ostream.h"
64#include "llvm/TargetParser/Triple.h"
65#include <algorithm>
66#include <cassert>
67#include <cstddef>
68#include <cstring>
69#include <memory>
70#include <optional>
71#include <string>
72#include <tuple>
73#include <type_traits>
74
75using namespace clang;
76
77Decl *clang::getPrimaryMergedDecl(Decl *D) {
78 return D->getASTContext().getPrimaryMergedDecl(D);
79}
80
81void PrettyDeclStackTraceEntry::print(raw_ostream &OS) const {
82 SourceLocation Loc = this->Loc;
83 if (!Loc.isValid() && TheDecl) Loc = TheDecl->getLocation();
84 if (Loc.isValid()) {
85 Loc.print(OS, SM: Context.getSourceManager());
86 OS << ": ";
87 }
88 OS << Message;
89
90 if (auto *ND = dyn_cast_if_present<NamedDecl>(Val: TheDecl)) {
91 OS << " '";
92 ND->getNameForDiagnostic(OS, Policy: Context.getPrintingPolicy(), Qualified: true);
93 OS << "'";
94 }
95
96 OS << '\n';
97}
98
99// Defined here so that it can be inlined into its direct callers.
100bool Decl::isOutOfLine() const {
101 return !getLexicalDeclContext()->Equals(DC: getDeclContext());
102}
103
104TranslationUnitDecl::TranslationUnitDecl(ASTContext &ctx)
105 : Decl(TranslationUnit, nullptr, SourceLocation()),
106 DeclContext(TranslationUnit), redeclarable_base(ctx), Ctx(ctx) {}
107
108//===----------------------------------------------------------------------===//
109// NamedDecl Implementation
110//===----------------------------------------------------------------------===//
111
112// Visibility rules aren't rigorously externally specified, but here
113// are the basic principles behind what we implement:
114//
115// 1. An explicit visibility attribute is generally a direct expression
116// of the user's intent and should be honored. Only the innermost
117// visibility attribute applies. If no visibility attribute applies,
118// global visibility settings are considered.
119//
120// 2. There is one caveat to the above: on or in a template pattern,
121// an explicit visibility attribute is just a default rule, and
122// visibility can be decreased by the visibility of template
123// arguments. But this, too, has an exception: an attribute on an
124// explicit specialization or instantiation causes all the visibility
125// restrictions of the template arguments to be ignored.
126//
127// 3. A variable that does not otherwise have explicit visibility can
128// be restricted by the visibility of its type.
129//
130// 4. A visibility restriction is explicit if it comes from an
131// attribute (or something like it), not a global visibility setting.
132// When emitting a reference to an external symbol, visibility
133// restrictions are ignored unless they are explicit.
134//
135// 5. When computing the visibility of a non-type, including a
136// non-type member of a class, only non-type visibility restrictions
137// are considered: the 'visibility' attribute, global value-visibility
138// settings, and a few special cases like __private_extern.
139//
140// 6. When computing the visibility of a type, including a type member
141// of a class, only type visibility restrictions are considered:
142// the 'type_visibility' attribute and global type-visibility settings.
143// However, a 'visibility' attribute counts as a 'type_visibility'
144// attribute on any declaration that only has the former.
145//
146// The visibility of a "secondary" entity, like a template argument,
147// is computed using the kind of that entity, not the kind of the
148// primary entity for which we are computing visibility. For example,
149// the visibility of a specialization of either of these templates:
150// template <class T, bool (&compare)(T, X)> bool has_match(list<T>, X);
151// template <class T, bool (&compare)(T, X)> class matcher;
152// is restricted according to the type visibility of the argument 'T',
153// the type visibility of 'bool(&)(T,X)', and the value visibility of
154// the argument function 'compare'. That 'has_match' is a value
155// and 'matcher' is a type only matters when looking for attributes
156// and settings from the immediate context.
157
158/// Does this computation kind permit us to consider additional
159/// visibility settings from attributes and the like?
160static bool hasExplicitVisibilityAlready(LVComputationKind computation) {
161 return computation.IgnoreExplicitVisibility;
162}
163
164/// Given an LVComputationKind, return one of the same type/value sort
165/// that records that it already has explicit visibility.
166static LVComputationKind
167withExplicitVisibilityAlready(LVComputationKind Kind) {
168 Kind.IgnoreExplicitVisibility = true;
169 return Kind;
170}
171
172static std::optional<Visibility> getExplicitVisibility(const NamedDecl *D,
173 LVComputationKind kind) {
174 assert(!kind.IgnoreExplicitVisibility &&
175 "asking for explicit visibility when we shouldn't be");
176 return D->getExplicitVisibility(kind: kind.getExplicitVisibilityKind());
177}
178
179/// Is the given declaration a "type" or a "value" for the purposes of
180/// visibility computation?
181static bool usesTypeVisibility(const NamedDecl *D) {
182 return isa<TypeDecl>(Val: D) ||
183 isa<ClassTemplateDecl>(Val: D) ||
184 isa<ObjCInterfaceDecl>(Val: D);
185}
186
187/// Does the given declaration have member specialization information,
188/// and if so, is it an explicit specialization?
189template <class T>
190static std::enable_if_t<!std::is_base_of_v<RedeclarableTemplateDecl, T>, bool>
191isExplicitMemberSpecialization(const T *D) {
192 if (const MemberSpecializationInfo *member =
193 D->getMemberSpecializationInfo()) {
194 return member->isExplicitSpecialization();
195 }
196 return false;
197}
198
199/// For templates, this question is easier: a member template can't be
200/// explicitly instantiated, so there's a single bit indicating whether
201/// or not this is an explicit member specialization.
202static bool isExplicitMemberSpecialization(const RedeclarableTemplateDecl *D) {
203 return D->isMemberSpecialization();
204}
205
206/// Given a visibility attribute, return the explicit visibility
207/// associated with it.
208template <class T>
209static Visibility getVisibilityFromAttr(const T *attr) {
210 switch (attr->getVisibility()) {
211 case T::Default:
212 return DefaultVisibility;
213 case T::Hidden:
214 return HiddenVisibility;
215 case T::Protected:
216 return ProtectedVisibility;
217 }
218 llvm_unreachable("bad visibility kind");
219}
220
221/// Return the explicit visibility of the given declaration.
222static std::optional<Visibility>
223getVisibilityOf(const NamedDecl *D, NamedDecl::ExplicitVisibilityKind kind) {
224 // If we're ultimately computing the visibility of a type, look for
225 // a 'type_visibility' attribute before looking for 'visibility'.
226 if (kind == NamedDecl::VisibilityForType) {
227 if (const auto *A = D->getAttr<TypeVisibilityAttr>()) {
228 return getVisibilityFromAttr(attr: A);
229 }
230 }
231
232 // If this declaration has an explicit visibility attribute, use it.
233 if (const auto *A = D->getAttr<VisibilityAttr>()) {
234 return getVisibilityFromAttr(attr: A);
235 }
236
237 return std::nullopt;
238}
239
240LinkageInfo LinkageComputer::getLVForType(const Type &T,
241 LVComputationKind computation) {
242 if (computation.IgnoreAllVisibility)
243 return LinkageInfo(T.getLinkage(), DefaultVisibility, true);
244 return getTypeLinkageAndVisibility(T: &T);
245}
246
247/// Get the most restrictive linkage for the types in the given
248/// template parameter list. For visibility purposes, template
249/// parameters are part of the signature of a template.
250LinkageInfo LinkageComputer::getLVForTemplateParameterList(
251 const TemplateParameterList *Params, LVComputationKind computation) {
252 LinkageInfo LV;
253 for (const NamedDecl *P : *Params) {
254 // Template type parameters are the most common and never
255 // contribute to visibility, pack or not.
256 if (isa<TemplateTypeParmDecl>(Val: P))
257 continue;
258
259 // Non-type template parameters can be restricted by the value type, e.g.
260 // template <enum X> class A { ... };
261 // We have to be careful here, though, because we can be dealing with
262 // dependent types.
263 if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(Val: P)) {
264 // Handle the non-pack case first.
265 if (!NTTP->isExpandedParameterPack()) {
266 if (!NTTP->getType()->isDependentType()) {
267 LV.merge(other: getLVForType(T: *NTTP->getType(), computation));
268 }
269 continue;
270 }
271
272 // Look at all the types in an expanded pack.
273 for (unsigned i = 0, n = NTTP->getNumExpansionTypes(); i != n; ++i) {
274 QualType type = NTTP->getExpansionType(I: i);
275 if (!type->isDependentType())
276 LV.merge(other: getTypeLinkageAndVisibility(T: type));
277 }
278 continue;
279 }
280
281 // Template template parameters can be restricted by their
282 // template parameters, recursively.
283 const auto *TTP = cast<TemplateTemplateParmDecl>(Val: P);
284
285 // Handle the non-pack case first.
286 if (!TTP->isExpandedParameterPack()) {
287 LV.merge(other: getLVForTemplateParameterList(Params: TTP->getTemplateParameters(),
288 computation));
289 continue;
290 }
291
292 // Look at all expansions in an expanded pack.
293 for (unsigned i = 0, n = TTP->getNumExpansionTemplateParameters();
294 i != n; ++i) {
295 LV.merge(other: getLVForTemplateParameterList(
296 Params: TTP->getExpansionTemplateParameters(I: i), computation));
297 }
298 }
299
300 return LV;
301}
302
303static const Decl *getOutermostFuncOrBlockContext(const Decl *D) {
304 const Decl *Ret = nullptr;
305 const DeclContext *DC = D->getDeclContext();
306 while (DC->getDeclKind() != Decl::TranslationUnit) {
307 if (isa<FunctionDecl>(Val: DC) || isa<BlockDecl>(Val: DC))
308 Ret = cast<Decl>(Val: DC);
309 DC = DC->getParent();
310 }
311 return Ret;
312}
313
314/// Get the most restrictive linkage for the types and
315/// declarations in the given template argument list.
316///
317/// Note that we don't take an LVComputationKind because we always
318/// want to honor the visibility of template arguments in the same way.
319LinkageInfo
320LinkageComputer::getLVForTemplateArgumentList(ArrayRef<TemplateArgument> Args,
321 LVComputationKind computation) {
322 LinkageInfo LV;
323
324 for (const TemplateArgument &Arg : Args) {
325 switch (Arg.getKind()) {
326 case TemplateArgument::Null:
327 case TemplateArgument::Integral:
328 case TemplateArgument::Expression:
329 continue;
330
331 case TemplateArgument::Type:
332 LV.merge(other: getLVForType(T: *Arg.getAsType(), computation));
333 continue;
334
335 case TemplateArgument::Declaration: {
336 const NamedDecl *ND = Arg.getAsDecl();
337 assert(!usesTypeVisibility(ND));
338 LV.merge(other: getLVForDecl(D: ND, computation));
339 continue;
340 }
341
342 case TemplateArgument::NullPtr:
343 LV.merge(other: getTypeLinkageAndVisibility(T: Arg.getNullPtrType()));
344 continue;
345
346 case TemplateArgument::StructuralValue:
347 LV.merge(other: getLVForValue(V: Arg.getAsStructuralValue(), computation));
348 continue;
349
350 case TemplateArgument::Template:
351 case TemplateArgument::TemplateExpansion:
352 if (TemplateDecl *Template =
353 Arg.getAsTemplateOrTemplatePattern().getAsTemplateDecl())
354 LV.merge(other: getLVForDecl(D: Template, computation));
355 continue;
356
357 case TemplateArgument::Pack:
358 LV.merge(other: getLVForTemplateArgumentList(Args: Arg.getPackAsArray(), computation));
359 continue;
360 }
361 llvm_unreachable("bad template argument kind");
362 }
363
364 return LV;
365}
366
367LinkageInfo
368LinkageComputer::getLVForTemplateArgumentList(const TemplateArgumentList &TArgs,
369 LVComputationKind computation) {
370 return getLVForTemplateArgumentList(Args: TArgs.asArray(), computation);
371}
372
373static bool shouldConsiderTemplateVisibility(const FunctionDecl *fn,
374 const FunctionTemplateSpecializationInfo *specInfo) {
375 // Include visibility from the template parameters and arguments
376 // only if this is not an explicit instantiation or specialization
377 // with direct explicit visibility. (Implicit instantiations won't
378 // have a direct attribute.)
379 if (!specInfo->isExplicitInstantiationOrSpecialization())
380 return true;
381
382 return !fn->hasAttr<VisibilityAttr>();
383}
384
385/// Merge in template-related linkage and visibility for the given
386/// function template specialization.
387///
388/// We don't need a computation kind here because we can assume
389/// LVForValue.
390///
391/// \param[out] LV the computation to use for the parent
392void LinkageComputer::mergeTemplateLV(
393 LinkageInfo &LV, const FunctionDecl *fn,
394 const FunctionTemplateSpecializationInfo *specInfo,
395 LVComputationKind computation) {
396 bool considerVisibility =
397 shouldConsiderTemplateVisibility(fn, specInfo);
398
399 FunctionTemplateDecl *temp = specInfo->getTemplate();
400 // Merge information from the template declaration.
401 LinkageInfo tempLV = getLVForDecl(D: temp, computation);
402 // The linkage of the specialization should be consistent with the
403 // template declaration.
404 LV.setLinkage(tempLV.getLinkage());
405
406 // Merge information from the template parameters.
407 LinkageInfo paramsLV =
408 getLVForTemplateParameterList(Params: temp->getTemplateParameters(), computation);
409 LV.mergeMaybeWithVisibility(other: paramsLV, withVis: considerVisibility);
410
411 // Merge information from the template arguments.
412 const TemplateArgumentList &templateArgs = *specInfo->TemplateArguments;
413 LinkageInfo argsLV = getLVForTemplateArgumentList(TArgs: templateArgs, computation);
414 LV.mergeMaybeWithVisibility(other: argsLV, withVis: considerVisibility);
415}
416
417/// Does the given declaration have a direct visibility attribute
418/// that would match the given rules?
419static bool hasDirectVisibilityAttribute(const NamedDecl *D,
420 LVComputationKind computation) {
421 if (computation.IgnoreAllVisibility)
422 return false;
423
424 return (computation.isTypeVisibility() && D->hasAttr<TypeVisibilityAttr>()) ||
425 D->hasAttr<VisibilityAttr>();
426}
427
428/// Should we consider visibility associated with the template
429/// arguments and parameters of the given class template specialization?
430static bool shouldConsiderTemplateVisibility(
431 const ClassTemplateSpecializationDecl *spec,
432 LVComputationKind computation) {
433 // Include visibility from the template parameters and arguments
434 // only if this is not an explicit instantiation or specialization
435 // with direct explicit visibility (and note that implicit
436 // instantiations won't have a direct attribute).
437 //
438 // Furthermore, we want to ignore template parameters and arguments
439 // for an explicit specialization when computing the visibility of a
440 // member thereof with explicit visibility.
441 //
442 // This is a bit complex; let's unpack it.
443 //
444 // An explicit class specialization is an independent, top-level
445 // declaration. As such, if it or any of its members has an
446 // explicit visibility attribute, that must directly express the
447 // user's intent, and we should honor it. The same logic applies to
448 // an explicit instantiation of a member of such a thing.
449
450 // Fast path: if this is not an explicit instantiation or
451 // specialization, we always want to consider template-related
452 // visibility restrictions.
453 if (!spec->isExplicitInstantiationOrSpecialization())
454 return true;
455
456 // This is the 'member thereof' check.
457 if (spec->isExplicitSpecialization() &&
458 hasExplicitVisibilityAlready(computation))
459 return false;
460
461 return !hasDirectVisibilityAttribute(D: spec, computation);
462}
463
464/// Merge in template-related linkage and visibility for the given
465/// class template specialization.
466void LinkageComputer::mergeTemplateLV(
467 LinkageInfo &LV, const ClassTemplateSpecializationDecl *spec,
468 LVComputationKind computation) {
469 bool considerVisibility = shouldConsiderTemplateVisibility(spec, computation);
470
471 // Merge information from the template parameters, but ignore
472 // visibility if we're only considering template arguments.
473 ClassTemplateDecl *temp = spec->getSpecializedTemplate();
474 // Merge information from the template declaration.
475 LinkageInfo tempLV = getLVForDecl(D: temp, computation);
476 // The linkage of the specialization should be consistent with the
477 // template declaration.
478 LV.setLinkage(tempLV.getLinkage());
479
480 LinkageInfo paramsLV =
481 getLVForTemplateParameterList(Params: temp->getTemplateParameters(), computation);
482 LV.mergeMaybeWithVisibility(other: paramsLV,
483 withVis: considerVisibility && !hasExplicitVisibilityAlready(computation));
484
485 // Merge information from the template arguments. We ignore
486 // template-argument visibility if we've got an explicit
487 // instantiation with a visibility attribute.
488 const TemplateArgumentList &templateArgs = spec->getTemplateArgs();
489 LinkageInfo argsLV = getLVForTemplateArgumentList(TArgs: templateArgs, computation);
490 if (considerVisibility)
491 LV.mergeVisibility(other: argsLV);
492 LV.mergeExternalVisibility(Other: argsLV);
493}
494
495/// Should we consider visibility associated with the template
496/// arguments and parameters of the given variable template
497/// specialization? As usual, follow class template specialization
498/// logic up to initialization.
499static bool shouldConsiderTemplateVisibility(
500 const VarTemplateSpecializationDecl *spec,
501 LVComputationKind computation) {
502 // Include visibility from the template parameters and arguments
503 // only if this is not an explicit instantiation or specialization
504 // with direct explicit visibility (and note that implicit
505 // instantiations won't have a direct attribute).
506 if (!spec->isExplicitInstantiationOrSpecialization())
507 return true;
508
509 // An explicit variable specialization is an independent, top-level
510 // declaration. As such, if it has an explicit visibility attribute,
511 // that must directly express the user's intent, and we should honor
512 // it.
513 if (spec->isExplicitSpecialization() &&
514 hasExplicitVisibilityAlready(computation))
515 return false;
516
517 return !hasDirectVisibilityAttribute(D: spec, computation);
518}
519
520/// Merge in template-related linkage and visibility for the given
521/// variable template specialization. As usual, follow class template
522/// specialization logic up to initialization.
523void LinkageComputer::mergeTemplateLV(LinkageInfo &LV,
524 const VarTemplateSpecializationDecl *spec,
525 LVComputationKind computation) {
526 bool considerVisibility = shouldConsiderTemplateVisibility(spec, computation);
527
528 // Merge information from the template parameters, but ignore
529 // visibility if we're only considering template arguments.
530 VarTemplateDecl *temp = spec->getSpecializedTemplate();
531 LinkageInfo tempLV =
532 getLVForTemplateParameterList(Params: temp->getTemplateParameters(), computation);
533 LV.mergeMaybeWithVisibility(other: tempLV,
534 withVis: considerVisibility && !hasExplicitVisibilityAlready(computation));
535
536 // Merge information from the template arguments. We ignore
537 // template-argument visibility if we've got an explicit
538 // instantiation with a visibility attribute.
539 const TemplateArgumentList &templateArgs = spec->getTemplateArgs();
540 LinkageInfo argsLV = getLVForTemplateArgumentList(TArgs: templateArgs, computation);
541 if (considerVisibility)
542 LV.mergeVisibility(other: argsLV);
543 LV.mergeExternalVisibility(Other: argsLV);
544}
545
546static bool useInlineVisibilityHidden(const NamedDecl *D) {
547 // FIXME: we should warn if -fvisibility-inlines-hidden is used with c.
548 const LangOptions &Opts = D->getASTContext().getLangOpts();
549 if (!Opts.CPlusPlus || !Opts.InlineVisibilityHidden)
550 return false;
551
552 const auto *FD = dyn_cast<FunctionDecl>(Val: D);
553 if (!FD)
554 return false;
555
556 TemplateSpecializationKind TSK = TSK_Undeclared;
557 if (FunctionTemplateSpecializationInfo *spec
558 = FD->getTemplateSpecializationInfo()) {
559 TSK = spec->getTemplateSpecializationKind();
560 } else if (MemberSpecializationInfo *MSI =
561 FD->getMemberSpecializationInfo()) {
562 TSK = MSI->getTemplateSpecializationKind();
563 }
564
565 const FunctionDecl *Def = nullptr;
566 // InlineVisibilityHidden only applies to definitions, and
567 // isInlined() only gives meaningful answers on definitions
568 // anyway.
569 return TSK != TSK_ExplicitInstantiationDeclaration &&
570 TSK != TSK_ExplicitInstantiationDefinition &&
571 FD->hasBody(Definition&: Def) && Def->isInlined() && !Def->hasAttr<GNUInlineAttr>();
572}
573
574template <typename T> static bool isFirstInExternCContext(T *D) {
575 const T *First = D->getFirstDecl();
576 return First->isInExternCContext();
577}
578
579static bool isSingleLineLanguageLinkage(const Decl &D) {
580 if (const auto *SD = dyn_cast<LinkageSpecDecl>(Val: D.getDeclContext()))
581 if (!SD->hasBraces())
582 return true;
583 return false;
584}
585
586static bool isDeclaredInModuleInterfaceOrPartition(const NamedDecl *D) {
587 if (auto *M = D->getOwningModule())
588 return M->isInterfaceOrPartition();
589 return false;
590}
591
592static LinkageInfo getExternalLinkageFor(const NamedDecl *D) {
593 return LinkageInfo::external();
594}
595
596static StorageClass getStorageClass(const Decl *D) {
597 if (auto *TD = dyn_cast<TemplateDecl>(Val: D))
598 D = TD->getTemplatedDecl();
599 if (D) {
600 if (auto *VD = dyn_cast<VarDecl>(Val: D))
601 return VD->getStorageClass();
602 if (auto *FD = dyn_cast<FunctionDecl>(Val: D))
603 return FD->getStorageClass();
604 }
605 return SC_None;
606}
607
608LinkageInfo
609LinkageComputer::getLVForNamespaceScopeDecl(const NamedDecl *D,
610 LVComputationKind computation,
611 bool IgnoreVarTypeLinkage) {
612 assert(D->getDeclContext()->getRedeclContext()->isFileContext() &&
613 "Not a name having namespace scope");
614 ASTContext &Context = D->getASTContext();
615 const auto *Var = dyn_cast<VarDecl>(Val: D);
616
617 // C++ [basic.link]p3:
618 // A name having namespace scope (3.3.6) has internal linkage if it
619 // is the name of
620
621 if ((getStorageClass(D: D->getCanonicalDecl()) == SC_Static) ||
622 (Context.getLangOpts().C23 && Var && Var->isConstexpr())) {
623 // - a variable, variable template, function, or function template
624 // that is explicitly declared static; or
625 // (This bullet corresponds to C99 6.2.2p3.)
626
627 // C23 6.2.2p3
628 // If the declaration of a file scope identifier for
629 // an object contains any of the storage-class specifiers static or
630 // constexpr then the identifier has internal linkage.
631 return LinkageInfo::internal();
632 }
633
634 if (Var) {
635 // - a non-template variable of non-volatile const-qualified type, unless
636 // - it is explicitly declared extern, or
637 // - it is declared in the purview of a module interface unit
638 // (outside the private-module-fragment, if any) or module partition, or
639 // - it is inline, or
640 // - it was previously declared and the prior declaration did not have
641 // internal linkage
642 // (There is no equivalent in C99.)
643 if (Context.getLangOpts().CPlusPlus && Var->getType().isConstQualified() &&
644 !Var->getType().isVolatileQualified() && !Var->isInline() &&
645 !isDeclaredInModuleInterfaceOrPartition(D: Var) &&
646 !isa<VarTemplateSpecializationDecl>(Val: Var) &&
647 !Var->getDescribedVarTemplate()) {
648 const VarDecl *PrevVar = Var->getPreviousDecl();
649 if (PrevVar)
650 return getLVForDecl(D: PrevVar, computation);
651
652 if (Var->getStorageClass() != SC_Extern &&
653 Var->getStorageClass() != SC_PrivateExtern &&
654 !isSingleLineLanguageLinkage(D: *Var))
655 return LinkageInfo::internal();
656 }
657
658 for (const VarDecl *PrevVar = Var->getPreviousDecl(); PrevVar;
659 PrevVar = PrevVar->getPreviousDecl()) {
660 if (PrevVar->getStorageClass() == SC_PrivateExtern &&
661 Var->getStorageClass() == SC_None)
662 return getDeclLinkageAndVisibility(D: PrevVar);
663 // Explicitly declared static.
664 if (PrevVar->getStorageClass() == SC_Static)
665 return LinkageInfo::internal();
666 }
667 } else if (const auto *IFD = dyn_cast<IndirectFieldDecl>(Val: D)) {
668 // - a data member of an anonymous union.
669 const VarDecl *VD = IFD->getVarDecl();
670 assert(VD && "Expected a VarDecl in this IndirectFieldDecl!");
671 return getLVForNamespaceScopeDecl(D: VD, computation, IgnoreVarTypeLinkage);
672 }
673 assert(!isa<FieldDecl>(D) && "Didn't expect a FieldDecl!");
674
675 // FIXME: This gives internal linkage to names that should have no linkage
676 // (those not covered by [basic.link]p6).
677 if (D->isInAnonymousNamespace()) {
678 const auto *Var = dyn_cast<VarDecl>(Val: D);
679 const auto *Func = dyn_cast<FunctionDecl>(Val: D);
680 // FIXME: The check for extern "C" here is not justified by the standard
681 // wording, but we retain it from the pre-DR1113 model to avoid breaking
682 // code.
683 //
684 // C++11 [basic.link]p4:
685 // An unnamed namespace or a namespace declared directly or indirectly
686 // within an unnamed namespace has internal linkage.
687 if ((!Var || !isFirstInExternCContext(D: Var)) &&
688 (!Func || !isFirstInExternCContext(D: Func)))
689 return LinkageInfo::internal();
690 }
691
692 // Set up the defaults.
693
694 // C99 6.2.2p5:
695 // If the declaration of an identifier for an object has file
696 // scope and no storage-class specifier, its linkage is
697 // external.
698 LinkageInfo LV = getExternalLinkageFor(D);
699
700 if (!hasExplicitVisibilityAlready(computation)) {
701 if (std::optional<Visibility> Vis = getExplicitVisibility(D, kind: computation)) {
702 LV.mergeVisibility(newVis: *Vis, newExplicit: true);
703 } else {
704 // If we're declared in a namespace with a visibility attribute,
705 // use that namespace's visibility, and it still counts as explicit.
706 for (const DeclContext *DC = D->getDeclContext();
707 !isa<TranslationUnitDecl>(Val: DC);
708 DC = DC->getParent()) {
709 const auto *ND = dyn_cast<NamespaceDecl>(Val: DC);
710 if (!ND) continue;
711 if (std::optional<Visibility> Vis =
712 getExplicitVisibility(D: ND, kind: computation)) {
713 LV.mergeVisibility(newVis: *Vis, newExplicit: true);
714 break;
715 }
716 }
717 }
718
719 // Add in global settings if the above didn't give us direct visibility.
720 if (!LV.isVisibilityExplicit()) {
721 // Use global type/value visibility as appropriate.
722 Visibility globalVisibility =
723 computation.isValueVisibility()
724 ? Context.getLangOpts().getValueVisibilityMode()
725 : Context.getLangOpts().getTypeVisibilityMode();
726 LV.mergeVisibility(newVis: globalVisibility, /*explicit*/ newExplicit: false);
727
728 // If we're paying attention to global visibility, apply
729 // -finline-visibility-hidden if this is an inline method.
730 if (useInlineVisibilityHidden(D))
731 LV.mergeVisibility(newVis: HiddenVisibility, /*visibilityExplicit=*/newExplicit: false);
732 }
733 }
734
735 // C++ [basic.link]p4:
736
737 // A name having namespace scope that has not been given internal linkage
738 // above and that is the name of
739 // [...bullets...]
740 // has its linkage determined as follows:
741 // - if the enclosing namespace has internal linkage, the name has
742 // internal linkage; [handled above]
743 // - otherwise, if the declaration of the name is attached to a named
744 // module and is not exported, the name has module linkage;
745 // - otherwise, the name has external linkage.
746 // LV is currently set up to handle the last two bullets.
747 //
748 // The bullets are:
749
750 // - a variable; or
751 if (const auto *Var = dyn_cast<VarDecl>(Val: D)) {
752 // GCC applies the following optimization to variables and static
753 // data members, but not to functions:
754 //
755 // Modify the variable's LV by the LV of its type unless this is
756 // C or extern "C". This follows from [basic.link]p9:
757 // A type without linkage shall not be used as the type of a
758 // variable or function with external linkage unless
759 // - the entity has C language linkage, or
760 // - the entity is declared within an unnamed namespace, or
761 // - the entity is not used or is defined in the same
762 // translation unit.
763 // and [basic.link]p10:
764 // ...the types specified by all declarations referring to a
765 // given variable or function shall be identical...
766 // C does not have an equivalent rule.
767 //
768 // Ignore this if we've got an explicit attribute; the user
769 // probably knows what they're doing.
770 //
771 // Note that we don't want to make the variable non-external
772 // because of this, but unique-external linkage suits us.
773
774 if (Context.getLangOpts().CPlusPlus && !isFirstInExternCContext(D: Var) &&
775 !IgnoreVarTypeLinkage) {
776 LinkageInfo TypeLV = getLVForType(T: *Var->getType(), computation);
777 if (!isExternallyVisible(L: TypeLV.getLinkage()))
778 return LinkageInfo::uniqueExternal();
779 if (!LV.isVisibilityExplicit())
780 LV.mergeVisibility(other: TypeLV);
781 }
782
783 if (Var->getStorageClass() == SC_PrivateExtern)
784 LV.mergeVisibility(newVis: HiddenVisibility, newExplicit: true);
785
786 // Note that Sema::MergeVarDecl already takes care of implementing
787 // C99 6.2.2p4 and propagating the visibility attribute, so we don't have
788 // to do it here.
789
790 // As per function and class template specializations (below),
791 // consider LV for the template and template arguments. We're at file
792 // scope, so we do not need to worry about nested specializations.
793 if (const auto *spec = dyn_cast<VarTemplateSpecializationDecl>(Val: Var)) {
794 mergeTemplateLV(LV, spec, computation);
795 }
796
797 // - a function; or
798 } else if (const auto *Function = dyn_cast<FunctionDecl>(Val: D)) {
799 // In theory, we can modify the function's LV by the LV of its
800 // type unless it has C linkage (see comment above about variables
801 // for justification). In practice, GCC doesn't do this, so it's
802 // just too painful to make work.
803
804 if (Function->getStorageClass() == SC_PrivateExtern)
805 LV.mergeVisibility(newVis: HiddenVisibility, newExplicit: true);
806
807 // OpenMP target declare device functions are not callable from the host so
808 // they should not be exported from the device image. This applies to all
809 // functions as the host-callable kernel functions are emitted at codegen.
810 if (Context.getLangOpts().OpenMP &&
811 Context.getLangOpts().OpenMPIsTargetDevice &&
812 ((Context.getTargetInfo().getTriple().isAMDGPU() ||
813 Context.getTargetInfo().getTriple().isNVPTX()) ||
814 OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(VD: Function)))
815 LV.mergeVisibility(newVis: HiddenVisibility, /*newExplicit=*/false);
816
817 // Note that Sema::MergeCompatibleFunctionDecls already takes care of
818 // merging storage classes and visibility attributes, so we don't have to
819 // look at previous decls in here.
820
821 // In C++, then if the type of the function uses a type with
822 // unique-external linkage, it's not legally usable from outside
823 // this translation unit. However, we should use the C linkage
824 // rules instead for extern "C" declarations.
825 if (Context.getLangOpts().CPlusPlus && !isFirstInExternCContext(D: Function)) {
826 // Only look at the type-as-written. Otherwise, deducing the return type
827 // of a function could change its linkage.
828 QualType TypeAsWritten = Function->getType();
829 if (TypeSourceInfo *TSI = Function->getTypeSourceInfo())
830 TypeAsWritten = TSI->getType();
831 if (!isExternallyVisible(L: TypeAsWritten->getLinkage()))
832 return LinkageInfo::uniqueExternal();
833 }
834
835 // Consider LV from the template and the template arguments.
836 // We're at file scope, so we do not need to worry about nested
837 // specializations.
838 if (FunctionTemplateSpecializationInfo *specInfo
839 = Function->getTemplateSpecializationInfo()) {
840 mergeTemplateLV(LV, fn: Function, specInfo, computation);
841 }
842
843 // - a named class (Clause 9), or an unnamed class defined in a
844 // typedef declaration in which the class has the typedef name
845 // for linkage purposes (7.1.3); or
846 // - a named enumeration (7.2), or an unnamed enumeration
847 // defined in a typedef declaration in which the enumeration
848 // has the typedef name for linkage purposes (7.1.3); or
849 } else if (const auto *Tag = dyn_cast<TagDecl>(Val: D)) {
850 // Unnamed tags have no linkage.
851 if (!Tag->hasNameForLinkage())
852 return LinkageInfo::none();
853
854 // If this is a class template specialization, consider the
855 // linkage of the template and template arguments. We're at file
856 // scope, so we do not need to worry about nested specializations.
857 if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(Val: Tag)) {
858 mergeTemplateLV(LV, spec, computation);
859 }
860
861 // FIXME: This is not part of the C++ standard any more.
862 // - an enumerator belonging to an enumeration with external linkage; or
863 } else if (isa<EnumConstantDecl>(Val: D)) {
864 LinkageInfo EnumLV = getLVForDecl(D: cast<NamedDecl>(Val: D->getDeclContext()),
865 computation);
866 if (!isExternalFormalLinkage(L: EnumLV.getLinkage()))
867 return LinkageInfo::none();
868 LV.merge(other: EnumLV);
869
870 // - a template
871 } else if (const auto *temp = dyn_cast<TemplateDecl>(Val: D)) {
872 bool considerVisibility = !hasExplicitVisibilityAlready(computation);
873 LinkageInfo tempLV =
874 getLVForTemplateParameterList(Params: temp->getTemplateParameters(), computation);
875 LV.mergeMaybeWithVisibility(other: tempLV, withVis: considerVisibility);
876
877 // An unnamed namespace or a namespace declared directly or indirectly
878 // within an unnamed namespace has internal linkage. All other namespaces
879 // have external linkage.
880 //
881 // We handled names in anonymous namespaces above.
882 } else if (isa<NamespaceDecl>(Val: D)) {
883 return LV;
884
885 // By extension, we assign external linkage to Objective-C
886 // interfaces.
887 } else if (isa<ObjCInterfaceDecl>(Val: D)) {
888 // fallout
889
890 } else if (auto *TD = dyn_cast<TypedefNameDecl>(Val: D)) {
891 // A typedef declaration has linkage if it gives a type a name for
892 // linkage purposes.
893 if (!TD->getAnonDeclWithTypedefName(/*AnyRedecl*/true))
894 return LinkageInfo::none();
895
896 } else if (isa<MSGuidDecl>(Val: D)) {
897 // A GUID behaves like an inline variable with external linkage. Fall
898 // through.
899
900 // Everything not covered here has no linkage.
901 } else {
902 return LinkageInfo::none();
903 }
904
905 // If we ended up with non-externally-visible linkage, visibility should
906 // always be default.
907 if (!isExternallyVisible(L: LV.getLinkage()))
908 return LinkageInfo(LV.getLinkage(), DefaultVisibility, false);
909
910 return LV;
911}
912
913LinkageInfo
914LinkageComputer::getLVForClassMember(const NamedDecl *D,
915 LVComputationKind computation,
916 bool IgnoreVarTypeLinkage) {
917 // Only certain class members have linkage. Note that fields don't
918 // really have linkage, but it's convenient to say they do for the
919 // purposes of calculating linkage of pointer-to-data-member
920 // template arguments.
921 //
922 // Templates also don't officially have linkage, but since we ignore
923 // the C++ standard and look at template arguments when determining
924 // linkage and visibility of a template specialization, we might hit
925 // a template template argument that way. If we do, we need to
926 // consider its linkage.
927 if (!(isa<CXXMethodDecl>(Val: D) ||
928 isa<VarDecl>(Val: D) ||
929 isa<FieldDecl>(Val: D) ||
930 isa<IndirectFieldDecl>(Val: D) ||
931 isa<TagDecl>(Val: D) ||
932 isa<TemplateDecl>(Val: D)))
933 return LinkageInfo::none();
934
935 LinkageInfo LV;
936
937 // If we have an explicit visibility attribute, merge that in.
938 if (!hasExplicitVisibilityAlready(computation)) {
939 if (std::optional<Visibility> Vis = getExplicitVisibility(D, kind: computation))
940 LV.mergeVisibility(newVis: *Vis, newExplicit: true);
941 // If we're paying attention to global visibility, apply
942 // -finline-visibility-hidden if this is an inline method.
943 //
944 // Note that we do this before merging information about
945 // the class visibility.
946 if (!LV.isVisibilityExplicit() && useInlineVisibilityHidden(D))
947 LV.mergeVisibility(newVis: HiddenVisibility, /*visibilityExplicit=*/newExplicit: false);
948 }
949
950 // If this class member has an explicit visibility attribute, the only
951 // thing that can change its visibility is the template arguments, so
952 // only look for them when processing the class.
953 LVComputationKind classComputation = computation;
954 if (LV.isVisibilityExplicit())
955 classComputation = withExplicitVisibilityAlready(Kind: computation);
956
957 LinkageInfo classLV =
958 getLVForDecl(D: cast<RecordDecl>(Val: D->getDeclContext()), computation: classComputation);
959 // The member has the same linkage as the class. If that's not externally
960 // visible, we don't need to compute anything about the linkage.
961 // FIXME: If we're only computing linkage, can we bail out here?
962 if (!isExternallyVisible(L: classLV.getLinkage()))
963 return classLV;
964
965
966 // Otherwise, don't merge in classLV yet, because in certain cases
967 // we need to completely ignore the visibility from it.
968
969 // Specifically, if this decl exists and has an explicit attribute.
970 const NamedDecl *explicitSpecSuppressor = nullptr;
971
972 if (const auto *MD = dyn_cast<CXXMethodDecl>(Val: D)) {
973 // Only look at the type-as-written. Otherwise, deducing the return type
974 // of a function could change its linkage.
975 QualType TypeAsWritten = MD->getType();
976 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo())
977 TypeAsWritten = TSI->getType();
978 if (!isExternallyVisible(L: TypeAsWritten->getLinkage()))
979 return LinkageInfo::uniqueExternal();
980
981 // If this is a method template specialization, use the linkage for
982 // the template parameters and arguments.
983 if (FunctionTemplateSpecializationInfo *spec
984 = MD->getTemplateSpecializationInfo()) {
985 mergeTemplateLV(LV, fn: MD, specInfo: spec, computation);
986 if (spec->isExplicitSpecialization()) {
987 explicitSpecSuppressor = MD;
988 } else if (isExplicitMemberSpecialization(D: spec->getTemplate())) {
989 explicitSpecSuppressor = spec->getTemplate()->getTemplatedDecl();
990 }
991 } else if (isExplicitMemberSpecialization(D: MD)) {
992 explicitSpecSuppressor = MD;
993 }
994
995 // OpenMP target declare device functions are not callable from the host so
996 // they should not be exported from the device image. This applies to all
997 // functions as the host-callable kernel functions are emitted at codegen.
998 ASTContext &Context = D->getASTContext();
999 if (Context.getLangOpts().OpenMP &&
1000 Context.getLangOpts().OpenMPIsTargetDevice &&
1001 ((Context.getTargetInfo().getTriple().isAMDGPU() ||
1002 Context.getTargetInfo().getTriple().isNVPTX()) ||
1003 OMPDeclareTargetDeclAttr::isDeclareTargetDeclaration(VD: MD)))
1004 LV.mergeVisibility(newVis: HiddenVisibility, /*newExplicit=*/false);
1005
1006 } else if (const auto *RD = dyn_cast<CXXRecordDecl>(Val: D)) {
1007 if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(Val: RD)) {
1008 mergeTemplateLV(LV, spec, computation);
1009 if (spec->isExplicitSpecialization()) {
1010 explicitSpecSuppressor = spec;
1011 } else {
1012 const ClassTemplateDecl *temp = spec->getSpecializedTemplate();
1013 if (isExplicitMemberSpecialization(D: temp)) {
1014 explicitSpecSuppressor = temp->getTemplatedDecl();
1015 }
1016 }
1017 } else if (isExplicitMemberSpecialization(D: RD)) {
1018 explicitSpecSuppressor = RD;
1019 }
1020
1021 // Static data members.
1022 } else if (const auto *VD = dyn_cast<VarDecl>(Val: D)) {
1023 if (const auto *spec = dyn_cast<VarTemplateSpecializationDecl>(Val: VD))
1024 mergeTemplateLV(LV, spec, computation);
1025
1026 // Modify the variable's linkage by its type, but ignore the
1027 // type's visibility unless it's a definition.
1028 if (!IgnoreVarTypeLinkage) {
1029 LinkageInfo typeLV = getLVForType(T: *VD->getType(), computation);
1030 // FIXME: If the type's linkage is not externally visible, we can
1031 // give this static data member UniqueExternalLinkage.
1032 if (!LV.isVisibilityExplicit() && !classLV.isVisibilityExplicit())
1033 LV.mergeVisibility(other: typeLV);
1034 LV.mergeExternalVisibility(Other: typeLV);
1035 }
1036
1037 if (isExplicitMemberSpecialization(D: VD)) {
1038 explicitSpecSuppressor = VD;
1039 }
1040
1041 // Template members.
1042 } else if (const auto *temp = dyn_cast<TemplateDecl>(Val: D)) {
1043 bool considerVisibility =
1044 (!LV.isVisibilityExplicit() &&
1045 !classLV.isVisibilityExplicit() &&
1046 !hasExplicitVisibilityAlready(computation));
1047 LinkageInfo tempLV =
1048 getLVForTemplateParameterList(Params: temp->getTemplateParameters(), computation);
1049 LV.mergeMaybeWithVisibility(other: tempLV, withVis: considerVisibility);
1050
1051 if (const auto *redeclTemp = dyn_cast<RedeclarableTemplateDecl>(Val: temp)) {
1052 if (isExplicitMemberSpecialization(D: redeclTemp)) {
1053 explicitSpecSuppressor = temp->getTemplatedDecl();
1054 }
1055 }
1056 }
1057
1058 // We should never be looking for an attribute directly on a template.
1059 assert(!explicitSpecSuppressor || !isa<TemplateDecl>(explicitSpecSuppressor));
1060
1061 // If this member is an explicit member specialization, and it has
1062 // an explicit attribute, ignore visibility from the parent.
1063 bool considerClassVisibility = true;
1064 if (explicitSpecSuppressor &&
1065 // optimization: hasDVA() is true only with explicit visibility.
1066 LV.isVisibilityExplicit() &&
1067 classLV.getVisibility() != DefaultVisibility &&
1068 hasDirectVisibilityAttribute(D: explicitSpecSuppressor, computation)) {
1069 considerClassVisibility = false;
1070 }
1071
1072 // Finally, merge in information from the class.
1073 LV.mergeMaybeWithVisibility(other: classLV, withVis: considerClassVisibility);
1074 return LV;
1075}
1076
1077void NamedDecl::anchor() {}
1078
1079bool NamedDecl::isLinkageValid() const {
1080 if (!hasCachedLinkage())
1081 return true;
1082
1083 Linkage L = LinkageComputer{}
1084 .computeLVForDecl(D: this, computation: LVComputationKind::forLinkageOnly())
1085 .getLinkage();
1086 return L == getCachedLinkage();
1087}
1088
1089bool NamedDecl::isPlaceholderVar(const LangOptions &LangOpts) const {
1090 // [C++2c] [basic.scope.scope]/p5
1091 // A declaration is name-independent if its name is _ and it declares
1092 // - a variable with automatic storage duration,
1093 // - a structured binding not inhabiting a namespace scope,
1094 // - the variable introduced by an init-capture
1095 // - or a non-static data member.
1096
1097 if (!LangOpts.CPlusPlus || !getIdentifier() ||
1098 !getIdentifier()->isPlaceholder())
1099 return false;
1100 if (isa<FieldDecl>(Val: this))
1101 return true;
1102 if (const auto *IFD = dyn_cast<IndirectFieldDecl>(Val: this)) {
1103 if (!getDeclContext()->isFunctionOrMethod() &&
1104 !getDeclContext()->isRecord())
1105 return false;
1106 const VarDecl *VD = IFD->getVarDecl();
1107 return !VD || VD->getStorageDuration() == SD_Automatic;
1108 }
1109 // and it declares a variable with automatic storage duration
1110 if (const auto *VD = dyn_cast<VarDecl>(Val: this)) {
1111 if (isa<ParmVarDecl>(Val: VD))
1112 return false;
1113 if (VD->isInitCapture())
1114 return true;
1115 return VD->getStorageDuration() == StorageDuration::SD_Automatic;
1116 }
1117 if (const auto *BD = dyn_cast<BindingDecl>(Val: this);
1118 BD && getDeclContext()->isFunctionOrMethod()) {
1119 const VarDecl *VD = BD->getHoldingVar();
1120 return !VD || VD->getStorageDuration() == StorageDuration::SD_Automatic;
1121 }
1122 return false;
1123}
1124
1125ReservedIdentifierStatus
1126NamedDecl::isReserved(const LangOptions &LangOpts) const {
1127 const IdentifierInfo *II = getIdentifier();
1128
1129 // This triggers at least for CXXLiteralIdentifiers, which we already checked
1130 // at lexing time.
1131 if (!II)
1132 return ReservedIdentifierStatus::NotReserved;
1133
1134 ReservedIdentifierStatus Status = II->isReserved(LangOpts);
1135 if (isReservedAtGlobalScope(Status) && !isReservedInAllContexts(Status)) {
1136 // This name is only reserved at global scope. Check if this declaration
1137 // conflicts with a global scope declaration.
1138 if (isa<ParmVarDecl>(Val: this) || isTemplateParameter())
1139 return ReservedIdentifierStatus::NotReserved;
1140
1141 // C++ [dcl.link]/7:
1142 // Two declarations [conflict] if [...] one declares a function or
1143 // variable with C language linkage, and the other declares [...] a
1144 // variable that belongs to the global scope.
1145 //
1146 // Therefore names that are reserved at global scope are also reserved as
1147 // names of variables and functions with C language linkage.
1148 const DeclContext *DC = getDeclContext()->getRedeclContext();
1149 if (DC->isTranslationUnit())
1150 return Status;
1151 if (auto *VD = dyn_cast<VarDecl>(Val: this))
1152 if (VD->isExternC())
1153 return ReservedIdentifierStatus::StartsWithUnderscoreAndIsExternC;
1154 if (auto *FD = dyn_cast<FunctionDecl>(Val: this))
1155 if (FD->isExternC())
1156 return ReservedIdentifierStatus::StartsWithUnderscoreAndIsExternC;
1157 return ReservedIdentifierStatus::NotReserved;
1158 }
1159
1160 return Status;
1161}
1162
1163ObjCStringFormatFamily NamedDecl::getObjCFStringFormattingFamily() const {
1164 StringRef name = getName();
1165 if (name.empty()) return SFF_None;
1166
1167 if (name.front() == 'C')
1168 if (name == "CFStringCreateWithFormat" ||
1169 name == "CFStringCreateWithFormatAndArguments" ||
1170 name == "CFStringAppendFormat" ||
1171 name == "CFStringAppendFormatAndArguments")
1172 return SFF_CFString;
1173 return SFF_None;
1174}
1175
1176Linkage NamedDecl::getLinkageInternal() const {
1177 // We don't care about visibility here, so ask for the cheapest
1178 // possible visibility analysis.
1179 return LinkageComputer{}
1180 .getLVForDecl(D: this, computation: LVComputationKind::forLinkageOnly())
1181 .getLinkage();
1182}
1183
1184static bool isExportedFromModuleInterfaceUnit(const NamedDecl *D) {
1185 // FIXME: Handle isModulePrivate.
1186 switch (D->getModuleOwnershipKind()) {
1187 case Decl::ModuleOwnershipKind::Unowned:
1188 case Decl::ModuleOwnershipKind::ReachableWhenImported:
1189 case Decl::ModuleOwnershipKind::ModulePrivate:
1190 return false;
1191 case Decl::ModuleOwnershipKind::Visible:
1192 case Decl::ModuleOwnershipKind::VisibleWhenImported:
1193 return D->isInNamedModule();
1194 }
1195 llvm_unreachable("unexpected module ownership kind");
1196}
1197
1198/// Get the linkage from a semantic point of view. Entities in
1199/// anonymous namespaces are external (in c++98).
1200Linkage NamedDecl::getFormalLinkage() const {
1201 Linkage InternalLinkage = getLinkageInternal();
1202
1203 // C++ [basic.link]p4.8:
1204 // - if the declaration of the name is attached to a named module and is not
1205 // exported
1206 // the name has module linkage;
1207 //
1208 // [basic.namespace.general]/p2
1209 // A namespace is never attached to a named module and never has a name with
1210 // module linkage.
1211 if (isInNamedModule() && InternalLinkage == Linkage::External &&
1212 !isExportedFromModuleInterfaceUnit(
1213 D: cast<NamedDecl>(Val: this->getCanonicalDecl())) &&
1214 !isa<NamespaceDecl>(Val: this))
1215 InternalLinkage = Linkage::Module;
1216
1217 return clang::getFormalLinkage(L: InternalLinkage);
1218}
1219
1220LinkageInfo NamedDecl::getLinkageAndVisibility() const {
1221 return LinkageComputer{}.getDeclLinkageAndVisibility(D: this);
1222}
1223
1224static std::optional<Visibility>
1225getExplicitVisibilityAux(const NamedDecl *ND,
1226 NamedDecl::ExplicitVisibilityKind kind,
1227 bool IsMostRecent) {
1228 assert(!IsMostRecent || ND == ND->getMostRecentDecl());
1229
1230 // Check the declaration itself first.
1231 if (std::optional<Visibility> V = getVisibilityOf(D: ND, kind))
1232 return V;
1233
1234 // If this is a member class of a specialization of a class template
1235 // and the corresponding decl has explicit visibility, use that.
1236 if (const auto *RD = dyn_cast<CXXRecordDecl>(Val: ND)) {
1237 CXXRecordDecl *InstantiatedFrom = RD->getInstantiatedFromMemberClass();
1238 if (InstantiatedFrom)
1239 return getVisibilityOf(D: InstantiatedFrom, kind);
1240 }
1241
1242 // If there wasn't explicit visibility there, and this is a
1243 // specialization of a class template, check for visibility
1244 // on the pattern.
1245 if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(Val: ND)) {
1246 // Walk all the template decl till this point to see if there are
1247 // explicit visibility attributes.
1248 const auto *TD = spec->getSpecializedTemplate()->getTemplatedDecl();
1249 while (TD != nullptr) {
1250 auto Vis = getVisibilityOf(D: TD, kind);
1251 if (Vis != std::nullopt)
1252 return Vis;
1253 TD = TD->getPreviousDecl();
1254 }
1255 return std::nullopt;
1256 }
1257
1258 // Use the most recent declaration.
1259 if (!IsMostRecent && !isa<NamespaceDecl>(Val: ND)) {
1260 const NamedDecl *MostRecent = ND->getMostRecentDecl();
1261 if (MostRecent != ND)
1262 return getExplicitVisibilityAux(ND: MostRecent, kind, IsMostRecent: true);
1263 }
1264
1265 if (const auto *Var = dyn_cast<VarDecl>(Val: ND)) {
1266 if (Var->isStaticDataMember()) {
1267 VarDecl *InstantiatedFrom = Var->getInstantiatedFromStaticDataMember();
1268 if (InstantiatedFrom)
1269 return getVisibilityOf(D: InstantiatedFrom, kind);
1270 }
1271
1272 if (const auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(Val: Var))
1273 return getVisibilityOf(D: VTSD->getSpecializedTemplate()->getTemplatedDecl(),
1274 kind);
1275
1276 return std::nullopt;
1277 }
1278 // Also handle function template specializations.
1279 if (const auto *fn = dyn_cast<FunctionDecl>(Val: ND)) {
1280 // If the function is a specialization of a template with an
1281 // explicit visibility attribute, use that.
1282 if (FunctionTemplateSpecializationInfo *templateInfo
1283 = fn->getTemplateSpecializationInfo())
1284 return getVisibilityOf(D: templateInfo->getTemplate()->getTemplatedDecl(),
1285 kind);
1286
1287 // If the function is a member of a specialization of a class template
1288 // and the corresponding decl has explicit visibility, use that.
1289 FunctionDecl *InstantiatedFrom = fn->getInstantiatedFromMemberFunction();
1290 if (InstantiatedFrom)
1291 return getVisibilityOf(D: InstantiatedFrom, kind);
1292
1293 return std::nullopt;
1294 }
1295
1296 // The visibility of a template is stored in the templated decl.
1297 if (const auto *TD = dyn_cast<TemplateDecl>(Val: ND))
1298 return getVisibilityOf(D: TD->getTemplatedDecl(), kind);
1299
1300 return std::nullopt;
1301}
1302
1303std::optional<Visibility>
1304NamedDecl::getExplicitVisibility(ExplicitVisibilityKind kind) const {
1305 return getExplicitVisibilityAux(ND: this, kind, IsMostRecent: false);
1306}
1307
1308LinkageInfo LinkageComputer::getLVForClosure(const DeclContext *DC,
1309 Decl *ContextDecl,
1310 LVComputationKind computation) {
1311 // This lambda has its linkage/visibility determined by its owner.
1312 const NamedDecl *Owner;
1313 if (!ContextDecl)
1314 Owner = dyn_cast<NamedDecl>(Val: DC);
1315 else if (isa<ParmVarDecl>(Val: ContextDecl))
1316 Owner =
1317 dyn_cast<NamedDecl>(Val: ContextDecl->getDeclContext()->getRedeclContext());
1318 else if (isa<ImplicitConceptSpecializationDecl>(Val: ContextDecl)) {
1319 // Replace with the concept's owning decl, which is either a namespace or a
1320 // TU, so this needs a dyn_cast.
1321 Owner = dyn_cast<NamedDecl>(Val: ContextDecl->getDeclContext());
1322 } else {
1323 Owner = cast<NamedDecl>(Val: ContextDecl);
1324 }
1325
1326 if (!Owner)
1327 return LinkageInfo::none();
1328
1329 // If the owner has a deduced type, we need to skip querying the linkage and
1330 // visibility of that type, because it might involve this closure type. The
1331 // only effect of this is that we might give a lambda VisibleNoLinkage rather
1332 // than NoLinkage when we don't strictly need to, which is benign.
1333 auto *VD = dyn_cast<VarDecl>(Val: Owner);
1334 LinkageInfo OwnerLV =
1335 VD && VD->getType()->getContainedDeducedType()
1336 ? computeLVForDecl(D: Owner, computation, /*IgnoreVarTypeLinkage*/true)
1337 : getLVForDecl(D: Owner, computation);
1338
1339 // A lambda never formally has linkage. But if the owner is externally
1340 // visible, then the lambda is too. We apply the same rules to blocks.
1341 if (!isExternallyVisible(L: OwnerLV.getLinkage()))
1342 return LinkageInfo::none();
1343 return LinkageInfo(Linkage::VisibleNone, OwnerLV.getVisibility(),
1344 OwnerLV.isVisibilityExplicit());
1345}
1346
1347LinkageInfo LinkageComputer::getLVForLocalDecl(const NamedDecl *D,
1348 LVComputationKind computation) {
1349 if (const auto *Function = dyn_cast<FunctionDecl>(Val: D)) {
1350 if (Function->isInAnonymousNamespace() &&
1351 !isFirstInExternCContext(D: Function))
1352 return LinkageInfo::internal();
1353
1354 // This is a "void f();" which got merged with a file static.
1355 if (Function->getCanonicalDecl()->getStorageClass() == SC_Static)
1356 return LinkageInfo::internal();
1357
1358 LinkageInfo LV;
1359 if (!hasExplicitVisibilityAlready(computation)) {
1360 if (std::optional<Visibility> Vis =
1361 getExplicitVisibility(D: Function, kind: computation))
1362 LV.mergeVisibility(newVis: *Vis, newExplicit: true);
1363 }
1364
1365 // Note that Sema::MergeCompatibleFunctionDecls already takes care of
1366 // merging storage classes and visibility attributes, so we don't have to
1367 // look at previous decls in here.
1368
1369 return LV;
1370 }
1371
1372 if (const auto *Var = dyn_cast<VarDecl>(Val: D)) {
1373 if (Var->hasExternalStorage()) {
1374 if (Var->isInAnonymousNamespace() && !isFirstInExternCContext(D: Var))
1375 return LinkageInfo::internal();
1376
1377 LinkageInfo LV;
1378 if (Var->getStorageClass() == SC_PrivateExtern)
1379 LV.mergeVisibility(newVis: HiddenVisibility, newExplicit: true);
1380 else if (!hasExplicitVisibilityAlready(computation)) {
1381 if (std::optional<Visibility> Vis =
1382 getExplicitVisibility(D: Var, kind: computation))
1383 LV.mergeVisibility(newVis: *Vis, newExplicit: true);
1384 }
1385
1386 if (const VarDecl *Prev = Var->getPreviousDecl()) {
1387 LinkageInfo PrevLV = getLVForDecl(D: Prev, computation);
1388 if (PrevLV.getLinkage() != Linkage::Invalid)
1389 LV.setLinkage(PrevLV.getLinkage());
1390 LV.mergeVisibility(other: PrevLV);
1391 }
1392
1393 return LV;
1394 }
1395
1396 if (!Var->isStaticLocal())
1397 return LinkageInfo::none();
1398 }
1399
1400 ASTContext &Context = D->getASTContext();
1401 if (!Context.getLangOpts().CPlusPlus)
1402 return LinkageInfo::none();
1403
1404 const Decl *OuterD = getOutermostFuncOrBlockContext(D);
1405 if (!OuterD || OuterD->isInvalidDecl())
1406 return LinkageInfo::none();
1407
1408 LinkageInfo LV;
1409 if (const auto *BD = dyn_cast<BlockDecl>(Val: OuterD)) {
1410 if (!BD->getBlockManglingNumber())
1411 return LinkageInfo::none();
1412
1413 LV = getLVForClosure(DC: BD->getDeclContext()->getRedeclContext(),
1414 ContextDecl: BD->getBlockManglingContextDecl(), computation);
1415 } else {
1416 const auto *FD = cast<FunctionDecl>(Val: OuterD);
1417 if (!FD->isInlined() &&
1418 !isTemplateInstantiation(Kind: FD->getTemplateSpecializationKind()))
1419 return LinkageInfo::none();
1420
1421 // If a function is hidden by -fvisibility-inlines-hidden option and
1422 // is not explicitly attributed as a hidden function,
1423 // we should not make static local variables in the function hidden.
1424 LV = getLVForDecl(D: FD, computation);
1425 if (isa<VarDecl>(Val: D) && useInlineVisibilityHidden(D: FD) &&
1426 !LV.isVisibilityExplicit() &&
1427 !Context.getLangOpts().VisibilityInlinesHiddenStaticLocalVar) {
1428 assert(cast<VarDecl>(D)->isStaticLocal());
1429 // If this was an implicitly hidden inline method, check again for
1430 // explicit visibility on the parent class, and use that for static locals
1431 // if present.
1432 if (const auto *MD = dyn_cast<CXXMethodDecl>(Val: FD))
1433 LV = getLVForDecl(D: MD->getParent(), computation);
1434 if (!LV.isVisibilityExplicit()) {
1435 Visibility globalVisibility =
1436 computation.isValueVisibility()
1437 ? Context.getLangOpts().getValueVisibilityMode()
1438 : Context.getLangOpts().getTypeVisibilityMode();
1439 return LinkageInfo(Linkage::VisibleNone, globalVisibility,
1440 /*visibilityExplicit=*/false);
1441 }
1442 }
1443 }
1444 if (!isExternallyVisible(L: LV.getLinkage()))
1445 return LinkageInfo::none();
1446 return LinkageInfo(Linkage::VisibleNone, LV.getVisibility(),
1447 LV.isVisibilityExplicit());
1448}
1449
1450LinkageInfo LinkageComputer::computeLVForDecl(const NamedDecl *D,
1451 LVComputationKind computation,
1452 bool IgnoreVarTypeLinkage) {
1453 // Internal_linkage attribute overrides other considerations.
1454 if (D->hasAttr<InternalLinkageAttr>())
1455 return LinkageInfo::internal();
1456
1457 // Objective-C: treat all Objective-C declarations as having external
1458 // linkage.
1459 switch (D->getKind()) {
1460 default:
1461 break;
1462
1463 // Per C++ [basic.link]p2, only the names of objects, references,
1464 // functions, types, templates, namespaces, and values ever have linkage.
1465 //
1466 // Note that the name of a typedef, namespace alias, using declaration,
1467 // and so on are not the name of the corresponding type, namespace, or
1468 // declaration, so they do *not* have linkage.
1469 case Decl::ImplicitParam:
1470 case Decl::Label:
1471 case Decl::NamespaceAlias:
1472 case Decl::ParmVar:
1473 case Decl::Using:
1474 case Decl::UsingEnum:
1475 case Decl::UsingShadow:
1476 case Decl::UsingDirective:
1477 return LinkageInfo::none();
1478
1479 case Decl::EnumConstant:
1480 // C++ [basic.link]p4: an enumerator has the linkage of its enumeration.
1481 if (D->getASTContext().getLangOpts().CPlusPlus)
1482 return getLVForDecl(D: cast<EnumDecl>(Val: D->getDeclContext()), computation);
1483 return LinkageInfo::visible_none();
1484
1485 case Decl::Typedef:
1486 case Decl::TypeAlias:
1487 // A typedef declaration has linkage if it gives a type a name for
1488 // linkage purposes.
1489 if (!cast<TypedefNameDecl>(Val: D)
1490 ->getAnonDeclWithTypedefName(/*AnyRedecl*/true))
1491 return LinkageInfo::none();
1492 break;
1493
1494 case Decl::TemplateTemplateParm: // count these as external
1495 case Decl::NonTypeTemplateParm:
1496 case Decl::ObjCAtDefsField:
1497 case Decl::ObjCCategory:
1498 case Decl::ObjCCategoryImpl:
1499 case Decl::ObjCCompatibleAlias:
1500 case Decl::ObjCImplementation:
1501 case Decl::ObjCMethod:
1502 case Decl::ObjCProperty:
1503 case Decl::ObjCPropertyImpl:
1504 case Decl::ObjCProtocol:
1505 return getExternalLinkageFor(D);
1506
1507 case Decl::CXXRecord: {
1508 const auto *Record = cast<CXXRecordDecl>(Val: D);
1509 if (Record->isLambda()) {
1510 if (Record->hasKnownLambdaInternalLinkage() ||
1511 !Record->getLambdaManglingNumber()) {
1512 // This lambda has no mangling number, so it's internal.
1513 return LinkageInfo::internal();
1514 }
1515
1516 return getLVForClosure(
1517 DC: Record->getDeclContext()->getRedeclContext(),
1518 ContextDecl: Record->getLambdaContextDecl(), computation);
1519 }
1520
1521 break;
1522 }
1523
1524 case Decl::TemplateParamObject: {
1525 // The template parameter object can be referenced from anywhere its type
1526 // and value can be referenced.
1527 auto *TPO = cast<TemplateParamObjectDecl>(Val: D);
1528 LinkageInfo LV = getLVForType(T: *TPO->getType(), computation);
1529 LV.merge(other: getLVForValue(V: TPO->getValue(), computation));
1530 return LV;
1531 }
1532 }
1533
1534 // Handle linkage for namespace-scope names.
1535 if (D->getDeclContext()->getRedeclContext()->isFileContext())
1536 return getLVForNamespaceScopeDecl(D, computation, IgnoreVarTypeLinkage);
1537
1538 // C++ [basic.link]p5:
1539 // In addition, a member function, static data member, a named
1540 // class or enumeration of class scope, or an unnamed class or
1541 // enumeration defined in a class-scope typedef declaration such
1542 // that the class or enumeration has the typedef name for linkage
1543 // purposes (7.1.3), has external linkage if the name of the class
1544 // has external linkage.
1545 if (D->getDeclContext()->isRecord())
1546 return getLVForClassMember(D, computation, IgnoreVarTypeLinkage);
1547
1548 // C++ [basic.link]p6:
1549 // The name of a function declared in block scope and the name of
1550 // an object declared by a block scope extern declaration have
1551 // linkage. If there is a visible declaration of an entity with
1552 // linkage having the same name and type, ignoring entities
1553 // declared outside the innermost enclosing namespace scope, the
1554 // block scope declaration declares that same entity and receives
1555 // the linkage of the previous declaration. If there is more than
1556 // one such matching entity, the program is ill-formed. Otherwise,
1557 // if no matching entity is found, the block scope entity receives
1558 // external linkage.
1559 if (D->getDeclContext()->isFunctionOrMethod())
1560 return getLVForLocalDecl(D, computation);
1561
1562 // C++ [basic.link]p6:
1563 // Names not covered by these rules have no linkage.
1564 return LinkageInfo::none();
1565}
1566
1567/// getLVForDecl - Get the linkage and visibility for the given declaration.
1568LinkageInfo LinkageComputer::getLVForDecl(const NamedDecl *D,
1569 LVComputationKind computation) {
1570 // Internal_linkage attribute overrides other considerations.
1571 if (D->hasAttr<InternalLinkageAttr>())
1572 return LinkageInfo::internal();
1573
1574 if (computation.IgnoreAllVisibility && D->hasCachedLinkage())
1575 return LinkageInfo(D->getCachedLinkage(), DefaultVisibility, false);
1576
1577 if (std::optional<LinkageInfo> LI = lookup(ND: D, Kind: computation))
1578 return *LI;
1579
1580 LinkageInfo LV = computeLVForDecl(D, computation);
1581 if (D->hasCachedLinkage())
1582 assert(D->getCachedLinkage() == LV.getLinkage());
1583
1584 D->setCachedLinkage(LV.getLinkage());
1585 cache(ND: D, Kind: computation, Info: LV);
1586
1587#ifndef NDEBUG
1588 // In C (because of gnu inline) and in c++ with microsoft extensions an
1589 // static can follow an extern, so we can have two decls with different
1590 // linkages.
1591 const LangOptions &Opts = D->getASTContext().getLangOpts();
1592 if (!Opts.CPlusPlus || Opts.MicrosoftExt)
1593 return LV;
1594
1595 // We have just computed the linkage for this decl. By induction we know
1596 // that all other computed linkages match, check that the one we just
1597 // computed also does.
1598 NamedDecl *Old = nullptr;
1599 for (auto *I : D->redecls()) {
1600 auto *T = cast<NamedDecl>(I);
1601 if (T == D)
1602 continue;
1603 if (!T->isInvalidDecl() && T->hasCachedLinkage()) {
1604 Old = T;
1605 break;
1606 }
1607 }
1608 assert(!Old || Old->getCachedLinkage() == D->getCachedLinkage());
1609#endif
1610
1611 return LV;
1612}
1613
1614LinkageInfo LinkageComputer::getDeclLinkageAndVisibility(const NamedDecl *D) {
1615 NamedDecl::ExplicitVisibilityKind EK = usesTypeVisibility(D)
1616 ? NamedDecl::VisibilityForType
1617 : NamedDecl::VisibilityForValue;
1618 LVComputationKind CK(EK);
1619 return getLVForDecl(D, computation: D->getASTContext().getLangOpts().IgnoreXCOFFVisibility
1620 ? CK.forLinkageOnly()
1621 : CK);
1622}
1623
1624Module *Decl::getOwningModuleForLinkage() const {
1625 if (isa<NamespaceDecl>(Val: this))
1626 // Namespaces never have module linkage. It is the entities within them
1627 // that [may] do.
1628 return nullptr;
1629
1630 Module *M = getOwningModule();
1631 if (!M)
1632 return nullptr;
1633
1634 switch (M->Kind) {
1635 case Module::ModuleMapModule:
1636 // Module map modules have no special linkage semantics.
1637 return nullptr;
1638
1639 case Module::ModuleInterfaceUnit:
1640 case Module::ModuleImplementationUnit:
1641 case Module::ModulePartitionInterface:
1642 case Module::ModulePartitionImplementation:
1643 return M;
1644
1645 case Module::ModuleHeaderUnit:
1646 case Module::ExplicitGlobalModuleFragment:
1647 case Module::ImplicitGlobalModuleFragment:
1648 // The global module shouldn't change the linkage.
1649 return nullptr;
1650
1651 case Module::PrivateModuleFragment:
1652 // The private module fragment is part of its containing module for linkage
1653 // purposes.
1654 return M->Parent;
1655 }
1656
1657 llvm_unreachable("unknown module kind");
1658}
1659
1660void NamedDecl::printName(raw_ostream &OS, const PrintingPolicy &Policy) const {
1661 Name.print(OS, Policy);
1662}
1663
1664void NamedDecl::printName(raw_ostream &OS) const {
1665 printName(OS, Policy: getASTContext().getPrintingPolicy());
1666}
1667
1668std::string NamedDecl::getQualifiedNameAsString() const {
1669 std::string QualName;
1670 llvm::raw_string_ostream OS(QualName);
1671 printQualifiedName(OS, Policy: getASTContext().getPrintingPolicy());
1672 return QualName;
1673}
1674
1675void NamedDecl::printQualifiedName(raw_ostream &OS) const {
1676 printQualifiedName(OS, Policy: getASTContext().getPrintingPolicy());
1677}
1678
1679void NamedDecl::printQualifiedName(raw_ostream &OS,
1680 const PrintingPolicy &P) const {
1681 if (getDeclContext()->isFunctionOrMethod()) {
1682 // We do not print '(anonymous)' for function parameters without name.
1683 printName(OS, Policy: P);
1684 return;
1685 }
1686 printNestedNameSpecifier(OS, Policy: P);
1687 if (getDeclName())
1688 OS << *this;
1689 else {
1690 // Give the printName override a chance to pick a different name before we
1691 // fall back to "(anonymous)".
1692 SmallString<64> NameBuffer;
1693 llvm::raw_svector_ostream NameOS(NameBuffer);
1694 printName(OS&: NameOS, Policy: P);
1695 if (NameBuffer.empty())
1696 OS << "(anonymous)";
1697 else
1698 OS << NameBuffer;
1699 }
1700}
1701
1702void NamedDecl::printNestedNameSpecifier(raw_ostream &OS) const {
1703 printNestedNameSpecifier(OS, Policy: getASTContext().getPrintingPolicy());
1704}
1705
1706void NamedDecl::printNestedNameSpecifier(raw_ostream &OS,
1707 const PrintingPolicy &P) const {
1708 const DeclContext *Ctx = getDeclContext();
1709
1710 // For ObjC methods and properties, look through categories and use the
1711 // interface as context.
1712 if (auto *MD = dyn_cast<ObjCMethodDecl>(Val: this)) {
1713 if (auto *ID = MD->getClassInterface())
1714 Ctx = ID;
1715 } else if (auto *PD = dyn_cast<ObjCPropertyDecl>(Val: this)) {
1716 if (auto *MD = PD->getGetterMethodDecl())
1717 if (auto *ID = MD->getClassInterface())
1718 Ctx = ID;
1719 } else if (auto *ID = dyn_cast<ObjCIvarDecl>(Val: this)) {
1720 if (auto *CI = ID->getContainingInterface())
1721 Ctx = CI;
1722 }
1723
1724 if (Ctx->isFunctionOrMethod())
1725 return;
1726
1727 using ContextsTy = SmallVector<const DeclContext *, 8>;
1728 ContextsTy Contexts;
1729
1730 // Collect named contexts.
1731 DeclarationName NameInScope = getDeclName();
1732 for (; Ctx; Ctx = Ctx->getParent()) {
1733 // Suppress anonymous namespace if requested.
1734 if (P.SuppressUnwrittenScope && isa<NamespaceDecl>(Val: Ctx) &&
1735 cast<NamespaceDecl>(Val: Ctx)->isAnonymousNamespace())
1736 continue;
1737
1738 // Suppress inline namespace if it doesn't make the result ambiguous.
1739 if (P.SuppressInlineNamespace && Ctx->isInlineNamespace() && NameInScope &&
1740 cast<NamespaceDecl>(Val: Ctx)->isRedundantInlineQualifierFor(Name: NameInScope))
1741 continue;
1742
1743 // Skip non-named contexts such as linkage specifications and ExportDecls.
1744 const NamedDecl *ND = dyn_cast<NamedDecl>(Val: Ctx);
1745 if (!ND)
1746 continue;
1747
1748 Contexts.push_back(Elt: Ctx);
1749 NameInScope = ND->getDeclName();
1750 }
1751
1752 for (const DeclContext *DC : llvm::reverse(C&: Contexts)) {
1753 if (const auto *Spec = dyn_cast<ClassTemplateSpecializationDecl>(Val: DC)) {
1754 OS << Spec->getName();
1755 const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs();
1756 printTemplateArgumentList(
1757 OS, Args: TemplateArgs.asArray(), Policy: P,
1758 TPL: Spec->getSpecializedTemplate()->getTemplateParameters());
1759 } else if (const auto *ND = dyn_cast<NamespaceDecl>(Val: DC)) {
1760 if (ND->isAnonymousNamespace()) {
1761 OS << (P.MSVCFormatting ? "`anonymous namespace\'"
1762 : "(anonymous namespace)");
1763 }
1764 else
1765 OS << *ND;
1766 } else if (const auto *RD = dyn_cast<RecordDecl>(Val: DC)) {
1767 if (!RD->getIdentifier())
1768 OS << "(anonymous " << RD->getKindName() << ')';
1769 else
1770 OS << *RD;
1771 } else if (const auto *FD = dyn_cast<FunctionDecl>(Val: DC)) {
1772 const FunctionProtoType *FT = nullptr;
1773 if (FD->hasWrittenPrototype())
1774 FT = dyn_cast<FunctionProtoType>(Val: FD->getType()->castAs<FunctionType>());
1775
1776 OS << *FD << '(';
1777 if (FT) {
1778 unsigned NumParams = FD->getNumParams();
1779 for (unsigned i = 0; i < NumParams; ++i) {
1780 if (i)
1781 OS << ", ";
1782 OS << FD->getParamDecl(i)->getType().stream(Policy: P);
1783 }
1784
1785 if (FT->isVariadic()) {
1786 if (NumParams > 0)
1787 OS << ", ";
1788 OS << "...";
1789 }
1790 }
1791 OS << ')';
1792 } else if (const auto *ED = dyn_cast<EnumDecl>(Val: DC)) {
1793 // C++ [dcl.enum]p10: Each enum-name and each unscoped
1794 // enumerator is declared in the scope that immediately contains
1795 // the enum-specifier. Each scoped enumerator is declared in the
1796 // scope of the enumeration.
1797 // For the case of unscoped enumerator, do not include in the qualified
1798 // name any information about its enum enclosing scope, as its visibility
1799 // is global.
1800 if (ED->isScoped())
1801 OS << *ED;
1802 else
1803 continue;
1804 } else {
1805 OS << *cast<NamedDecl>(Val: DC);
1806 }
1807 OS << "::";
1808 }
1809}
1810
1811void NamedDecl::getNameForDiagnostic(raw_ostream &OS,
1812 const PrintingPolicy &Policy,
1813 bool Qualified) const {
1814 if (Qualified)
1815 printQualifiedName(OS, P: Policy);
1816 else
1817 printName(OS, Policy);
1818}
1819
1820template<typename T> static bool isRedeclarableImpl(Redeclarable<T> *) {
1821 return true;
1822}
1823static bool isRedeclarableImpl(...) { return false; }
1824static bool isRedeclarable(Decl::Kind K) {
1825 switch (K) {
1826#define DECL(Type, Base) \
1827 case Decl::Type: \
1828 return isRedeclarableImpl((Type##Decl *)nullptr);
1829#define ABSTRACT_DECL(DECL)
1830#include "clang/AST/DeclNodes.inc"
1831 }
1832 llvm_unreachable("unknown decl kind");
1833}
1834
1835bool NamedDecl::declarationReplaces(const NamedDecl *OldD,
1836 bool IsKnownNewer) const {
1837 assert(getDeclName() == OldD->getDeclName() && "Declaration name mismatch");
1838
1839 // Never replace one imported declaration with another; we need both results
1840 // when re-exporting.
1841 if (OldD->isFromASTFile() && isFromASTFile())
1842 return false;
1843
1844 // A kind mismatch implies that the declaration is not replaced.
1845 if (OldD->getKind() != getKind())
1846 return false;
1847
1848 // For method declarations, we never replace. (Why?)
1849 if (isa<ObjCMethodDecl>(Val: this))
1850 return false;
1851
1852 // For parameters, pick the newer one. This is either an error or (in
1853 // Objective-C) permitted as an extension.
1854 if (isa<ParmVarDecl>(Val: this))
1855 return true;
1856
1857 // Inline namespaces can give us two declarations with the same
1858 // name and kind in the same scope but different contexts; we should
1859 // keep both declarations in this case.
1860 if (!this->getDeclContext()->getRedeclContext()->Equals(
1861 DC: OldD->getDeclContext()->getRedeclContext()))
1862 return false;
1863
1864 // Using declarations can be replaced if they import the same name from the
1865 // same context.
1866 if (const auto *UD = dyn_cast<UsingDecl>(Val: this)) {
1867 ASTContext &Context = getASTContext();
1868 return Context.getCanonicalNestedNameSpecifier(NNS: UD->getQualifier()) ==
1869 Context.getCanonicalNestedNameSpecifier(
1870 NNS: cast<UsingDecl>(Val: OldD)->getQualifier());
1871 }
1872 if (const auto *UUVD = dyn_cast<UnresolvedUsingValueDecl>(Val: this)) {
1873 ASTContext &Context = getASTContext();
1874 return Context.getCanonicalNestedNameSpecifier(NNS: UUVD->getQualifier()) ==
1875 Context.getCanonicalNestedNameSpecifier(
1876 NNS: cast<UnresolvedUsingValueDecl>(Val: OldD)->getQualifier());
1877 }
1878
1879 if (isRedeclarable(K: getKind())) {
1880 if (getCanonicalDecl() != OldD->getCanonicalDecl())
1881 return false;
1882
1883 if (IsKnownNewer)
1884 return true;
1885
1886 // Check whether this is actually newer than OldD. We want to keep the
1887 // newer declaration. This loop will usually only iterate once, because
1888 // OldD is usually the previous declaration.
1889 for (const auto *D : redecls()) {
1890 if (D == OldD)
1891 break;
1892
1893 // If we reach the canonical declaration, then OldD is not actually older
1894 // than this one.
1895 //
1896 // FIXME: In this case, we should not add this decl to the lookup table.
1897 if (D->isCanonicalDecl())
1898 return false;
1899 }
1900
1901 // It's a newer declaration of the same kind of declaration in the same
1902 // scope: we want this decl instead of the existing one.
1903 return true;
1904 }
1905
1906 // In all other cases, we need to keep both declarations in case they have
1907 // different visibility. Any attempt to use the name will result in an
1908 // ambiguity if more than one is visible.
1909 return false;
1910}
1911
1912bool NamedDecl::hasLinkage() const {
1913 switch (getFormalLinkage()) {
1914 case Linkage::Invalid:
1915 llvm_unreachable("Linkage hasn't been computed!");
1916 case Linkage::None:
1917 return false;
1918 case Linkage::Internal:
1919 return true;
1920 case Linkage::UniqueExternal:
1921 case Linkage::VisibleNone:
1922 llvm_unreachable("Non-formal linkage is not allowed here!");
1923 case Linkage::Module:
1924 case Linkage::External:
1925 return true;
1926 }
1927 llvm_unreachable("Unhandled Linkage enum");
1928}
1929
1930NamedDecl *NamedDecl::getUnderlyingDeclImpl() {
1931 NamedDecl *ND = this;
1932 if (auto *UD = dyn_cast<UsingShadowDecl>(Val: ND))
1933 ND = UD->getTargetDecl();
1934
1935 if (auto *AD = dyn_cast<ObjCCompatibleAliasDecl>(Val: ND))
1936 return AD->getClassInterface();
1937
1938 if (auto *AD = dyn_cast<NamespaceAliasDecl>(Val: ND))
1939 return AD->getNamespace();
1940
1941 return ND;
1942}
1943
1944bool NamedDecl::isCXXInstanceMember() const {
1945 if (!isCXXClassMember())
1946 return false;
1947
1948 const NamedDecl *D = this;
1949 if (isa<UsingShadowDecl>(Val: D))
1950 D = cast<UsingShadowDecl>(Val: D)->getTargetDecl();
1951
1952 if (isa<FieldDecl>(Val: D) || isa<IndirectFieldDecl>(Val: D) || isa<MSPropertyDecl>(Val: D))
1953 return true;
1954 if (const auto *MD = dyn_cast_if_present<CXXMethodDecl>(Val: D->getAsFunction()))
1955 return MD->isInstance();
1956 return false;
1957}
1958
1959//===----------------------------------------------------------------------===//
1960// DeclaratorDecl Implementation
1961//===----------------------------------------------------------------------===//
1962
1963template <typename DeclT>
1964static SourceLocation getTemplateOrInnerLocStart(const DeclT *decl) {
1965 if (decl->getNumTemplateParameterLists() > 0)
1966 return decl->getTemplateParameterList(0)->getTemplateLoc();
1967 return decl->getInnerLocStart();
1968}
1969
1970SourceLocation DeclaratorDecl::getTypeSpecStartLoc() const {
1971 TypeSourceInfo *TSI = getTypeSourceInfo();
1972 if (TSI) return TSI->getTypeLoc().getBeginLoc();
1973 return SourceLocation();
1974}
1975
1976SourceLocation DeclaratorDecl::getTypeSpecEndLoc() const {
1977 TypeSourceInfo *TSI = getTypeSourceInfo();
1978 if (TSI) return TSI->getTypeLoc().getEndLoc();
1979 return SourceLocation();
1980}
1981
1982void DeclaratorDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) {
1983 if (QualifierLoc) {
1984 // Make sure the extended decl info is allocated.
1985 if (!hasExtInfo()) {
1986 // Save (non-extended) type source info pointer.
1987 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
1988 // Allocate external info struct.
1989 DeclInfo = new (getASTContext()) ExtInfo;
1990 // Restore savedTInfo into (extended) decl info.
1991 getExtInfo()->TInfo = savedTInfo;
1992 }
1993 // Set qualifier info.
1994 getExtInfo()->QualifierLoc = QualifierLoc;
1995 } else if (hasExtInfo()) {
1996 // Here Qualifier == 0, i.e., we are removing the qualifier (if any).
1997 getExtInfo()->QualifierLoc = QualifierLoc;
1998 }
1999}
2000
2001void DeclaratorDecl::setTrailingRequiresClause(Expr *TrailingRequiresClause) {
2002 assert(TrailingRequiresClause);
2003 // Make sure the extended decl info is allocated.
2004 if (!hasExtInfo()) {
2005 // Save (non-extended) type source info pointer.
2006 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
2007 // Allocate external info struct.
2008 DeclInfo = new (getASTContext()) ExtInfo;
2009 // Restore savedTInfo into (extended) decl info.
2010 getExtInfo()->TInfo = savedTInfo;
2011 }
2012 // Set requires clause info.
2013 getExtInfo()->TrailingRequiresClause = TrailingRequiresClause;
2014}
2015
2016void DeclaratorDecl::setTemplateParameterListsInfo(
2017 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
2018 assert(!TPLists.empty());
2019 // Make sure the extended decl info is allocated.
2020 if (!hasExtInfo()) {
2021 // Save (non-extended) type source info pointer.
2022 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
2023 // Allocate external info struct.
2024 DeclInfo = new (getASTContext()) ExtInfo;
2025 // Restore savedTInfo into (extended) decl info.
2026 getExtInfo()->TInfo = savedTInfo;
2027 }
2028 // Set the template parameter lists info.
2029 getExtInfo()->setTemplateParameterListsInfo(Context, TPLists);
2030}
2031
2032SourceLocation DeclaratorDecl::getOuterLocStart() const {
2033 return getTemplateOrInnerLocStart(decl: this);
2034}
2035
2036// Helper function: returns true if QT is or contains a type
2037// having a postfix component.
2038static bool typeIsPostfix(QualType QT) {
2039 while (true) {
2040 const Type* T = QT.getTypePtr();
2041 switch (T->getTypeClass()) {
2042 default:
2043 return false;
2044 case Type::Pointer:
2045 QT = cast<PointerType>(Val: T)->getPointeeType();
2046 break;
2047 case Type::BlockPointer:
2048 QT = cast<BlockPointerType>(Val: T)->getPointeeType();
2049 break;
2050 case Type::MemberPointer:
2051 QT = cast<MemberPointerType>(Val: T)->getPointeeType();
2052 break;
2053 case Type::LValueReference:
2054 case Type::RValueReference:
2055 QT = cast<ReferenceType>(Val: T)->getPointeeType();
2056 break;
2057 case Type::PackExpansion:
2058 QT = cast<PackExpansionType>(Val: T)->getPattern();
2059 break;
2060 case Type::Paren:
2061 case Type::ConstantArray:
2062 case Type::DependentSizedArray:
2063 case Type::IncompleteArray:
2064 case Type::VariableArray:
2065 case Type::FunctionProto:
2066 case Type::FunctionNoProto:
2067 return true;
2068 }
2069 }
2070}
2071
2072SourceRange DeclaratorDecl::getSourceRange() const {
2073 SourceLocation RangeEnd = getLocation();
2074 if (TypeSourceInfo *TInfo = getTypeSourceInfo()) {
2075 // If the declaration has no name or the type extends past the name take the
2076 // end location of the type.
2077 if (!getDeclName() || typeIsPostfix(QT: TInfo->getType()))
2078 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
2079 }
2080 return SourceRange(getOuterLocStart(), RangeEnd);
2081}
2082
2083void QualifierInfo::setTemplateParameterListsInfo(
2084 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
2085 // Free previous template parameters (if any).
2086 if (NumTemplParamLists > 0) {
2087 Context.Deallocate(Ptr: TemplParamLists);
2088 TemplParamLists = nullptr;
2089 NumTemplParamLists = 0;
2090 }
2091 // Set info on matched template parameter lists (if any).
2092 if (!TPLists.empty()) {
2093 TemplParamLists = new (Context) TemplateParameterList *[TPLists.size()];
2094 NumTemplParamLists = TPLists.size();
2095 std::copy(TPLists.begin(), TPLists.end(), TemplParamLists);
2096 }
2097}
2098
2099//===----------------------------------------------------------------------===//
2100// VarDecl Implementation
2101//===----------------------------------------------------------------------===//
2102
2103const char *VarDecl::getStorageClassSpecifierString(StorageClass SC) {
2104 switch (SC) {
2105 case SC_None: break;
2106 case SC_Auto: return "auto";
2107 case SC_Extern: return "extern";
2108 case SC_PrivateExtern: return "__private_extern__";
2109 case SC_Register: return "register";
2110 case SC_Static: return "static";
2111 }
2112
2113 llvm_unreachable("Invalid storage class");
2114}
2115
2116VarDecl::VarDecl(Kind DK, ASTContext &C, DeclContext *DC,
2117 SourceLocation StartLoc, SourceLocation IdLoc,
2118 const IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo,
2119 StorageClass SC)
2120 : DeclaratorDecl(DK, DC, IdLoc, Id, T, TInfo, StartLoc),
2121 redeclarable_base(C) {
2122 static_assert(sizeof(VarDeclBitfields) <= sizeof(unsigned),
2123 "VarDeclBitfields too large!");
2124 static_assert(sizeof(ParmVarDeclBitfields) <= sizeof(unsigned),
2125 "ParmVarDeclBitfields too large!");
2126 static_assert(sizeof(NonParmVarDeclBitfields) <= sizeof(unsigned),
2127 "NonParmVarDeclBitfields too large!");
2128 AllBits = 0;
2129 VarDeclBits.SClass = SC;
2130 // Everything else is implicitly initialized to false.
2131}
2132
2133VarDecl *VarDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation StartL,
2134 SourceLocation IdL, const IdentifierInfo *Id,
2135 QualType T, TypeSourceInfo *TInfo, StorageClass S) {
2136 return new (C, DC) VarDecl(Var, C, DC, StartL, IdL, Id, T, TInfo, S);
2137}
2138
2139VarDecl *VarDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID) {
2140 return new (C, ID)
2141 VarDecl(Var, C, nullptr, SourceLocation(), SourceLocation(), nullptr,
2142 QualType(), nullptr, SC_None);
2143}
2144
2145void VarDecl::setStorageClass(StorageClass SC) {
2146 assert(isLegalForVariable(SC));
2147 VarDeclBits.SClass = SC;
2148}
2149
2150VarDecl::TLSKind VarDecl::getTLSKind() const {
2151 switch (VarDeclBits.TSCSpec) {
2152 case TSCS_unspecified:
2153 if (!hasAttr<ThreadAttr>() &&
2154 !(getASTContext().getLangOpts().OpenMPUseTLS &&
2155 getASTContext().getTargetInfo().isTLSSupported() &&
2156 hasAttr<OMPThreadPrivateDeclAttr>()))
2157 return TLS_None;
2158 return ((getASTContext().getLangOpts().isCompatibleWithMSVC(
2159 MajorVersion: LangOptions::MSVC2015)) ||
2160 hasAttr<OMPThreadPrivateDeclAttr>())
2161 ? TLS_Dynamic
2162 : TLS_Static;
2163 case TSCS___thread: // Fall through.
2164 case TSCS__Thread_local:
2165 return TLS_Static;
2166 case TSCS_thread_local:
2167 return TLS_Dynamic;
2168 }
2169 llvm_unreachable("Unknown thread storage class specifier!");
2170}
2171
2172SourceRange VarDecl::getSourceRange() const {
2173 if (const Expr *Init = getInit()) {
2174 SourceLocation InitEnd = Init->getEndLoc();
2175 // If Init is implicit, ignore its source range and fallback on
2176 // DeclaratorDecl::getSourceRange() to handle postfix elements.
2177 if (InitEnd.isValid() && InitEnd != getLocation())
2178 return SourceRange(getOuterLocStart(), InitEnd);
2179 }
2180 return DeclaratorDecl::getSourceRange();
2181}
2182
2183template<typename T>
2184static LanguageLinkage getDeclLanguageLinkage(const T &D) {
2185 // C++ [dcl.link]p1: All function types, function names with external linkage,
2186 // and variable names with external linkage have a language linkage.
2187 if (!D.hasExternalFormalLinkage())
2188 return NoLanguageLinkage;
2189
2190 // Language linkage is a C++ concept, but saying that everything else in C has
2191 // C language linkage fits the implementation nicely.
2192 if (!D.getASTContext().getLangOpts().CPlusPlus)
2193 return CLanguageLinkage;
2194
2195 // C++ [dcl.link]p4: A C language linkage is ignored in determining the
2196 // language linkage of the names of class members and the function type of
2197 // class member functions.
2198 const DeclContext *DC = D.getDeclContext();
2199 if (DC->isRecord())
2200 return CXXLanguageLinkage;
2201
2202 // If the first decl is in an extern "C" context, any other redeclaration
2203 // will have C language linkage. If the first one is not in an extern "C"
2204 // context, we would have reported an error for any other decl being in one.
2205 if (isFirstInExternCContext(&D))
2206 return CLanguageLinkage;
2207 return CXXLanguageLinkage;
2208}
2209
2210template<typename T>
2211static bool isDeclExternC(const T &D) {
2212 // Since the context is ignored for class members, they can only have C++
2213 // language linkage or no language linkage.
2214 const DeclContext *DC = D.getDeclContext();
2215 if (DC->isRecord()) {
2216 assert(D.getASTContext().getLangOpts().CPlusPlus);
2217 return false;
2218 }
2219
2220 return D.getLanguageLinkage() == CLanguageLinkage;
2221}
2222
2223LanguageLinkage VarDecl::getLanguageLinkage() const {
2224 return getDeclLanguageLinkage(D: *this);
2225}
2226
2227bool VarDecl::isExternC() const {
2228 return isDeclExternC(D: *this);
2229}
2230
2231bool VarDecl::isInExternCContext() const {
2232 return getLexicalDeclContext()->isExternCContext();
2233}
2234
2235bool VarDecl::isInExternCXXContext() const {
2236 return getLexicalDeclContext()->isExternCXXContext();
2237}
2238
2239VarDecl *VarDecl::getCanonicalDecl() { return getFirstDecl(); }
2240
2241VarDecl::DefinitionKind
2242VarDecl::isThisDeclarationADefinition(ASTContext &C) const {
2243 if (isThisDeclarationADemotedDefinition())
2244 return DeclarationOnly;
2245
2246 // C++ [basic.def]p2:
2247 // A declaration is a definition unless [...] it contains the 'extern'
2248 // specifier or a linkage-specification and neither an initializer [...],
2249 // it declares a non-inline static data member in a class declaration [...],
2250 // it declares a static data member outside a class definition and the variable
2251 // was defined within the class with the constexpr specifier [...],
2252 // C++1y [temp.expl.spec]p15:
2253 // An explicit specialization of a static data member or an explicit
2254 // specialization of a static data member template is a definition if the
2255 // declaration includes an initializer; otherwise, it is a declaration.
2256 //
2257 // FIXME: How do you declare (but not define) a partial specialization of
2258 // a static data member template outside the containing class?
2259 if (isStaticDataMember()) {
2260 if (isOutOfLine() &&
2261 !(getCanonicalDecl()->isInline() &&
2262 getCanonicalDecl()->isConstexpr()) &&
2263 (hasInit() ||
2264 // If the first declaration is out-of-line, this may be an
2265 // instantiation of an out-of-line partial specialization of a variable
2266 // template for which we have not yet instantiated the initializer.
2267 (getFirstDecl()->isOutOfLine()
2268 ? getTemplateSpecializationKind() == TSK_Undeclared
2269 : getTemplateSpecializationKind() !=
2270 TSK_ExplicitSpecialization) ||
2271 isa<VarTemplatePartialSpecializationDecl>(Val: this)))
2272 return Definition;
2273 if (!isOutOfLine() && isInline())
2274 return Definition;
2275 return DeclarationOnly;
2276 }
2277 // C99 6.7p5:
2278 // A definition of an identifier is a declaration for that identifier that
2279 // [...] causes storage to be reserved for that object.
2280 // Note: that applies for all non-file-scope objects.
2281 // C99 6.9.2p1:
2282 // If the declaration of an identifier for an object has file scope and an
2283 // initializer, the declaration is an external definition for the identifier
2284 if (hasInit())
2285 return Definition;
2286
2287 if (hasDefiningAttr())
2288 return Definition;
2289
2290 if (const auto *SAA = getAttr<SelectAnyAttr>())
2291 if (!SAA->isInherited())
2292 return Definition;
2293
2294 // A variable template specialization (other than a static data member
2295 // template or an explicit specialization) is a declaration until we
2296 // instantiate its initializer.
2297 if (auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(Val: this)) {
2298 if (VTSD->getTemplateSpecializationKind() != TSK_ExplicitSpecialization &&
2299 !isa<VarTemplatePartialSpecializationDecl>(Val: VTSD) &&
2300 !VTSD->IsCompleteDefinition)
2301 return DeclarationOnly;
2302 }
2303
2304 if (hasExternalStorage())
2305 return DeclarationOnly;
2306
2307 // [dcl.link] p7:
2308 // A declaration directly contained in a linkage-specification is treated
2309 // as if it contains the extern specifier for the purpose of determining
2310 // the linkage of the declared name and whether it is a definition.
2311 if (isSingleLineLanguageLinkage(D: *this))
2312 return DeclarationOnly;
2313
2314 // C99 6.9.2p2:
2315 // A declaration of an object that has file scope without an initializer,
2316 // and without a storage class specifier or the scs 'static', constitutes
2317 // a tentative definition.
2318 // No such thing in C++.
2319 if (!C.getLangOpts().CPlusPlus && isFileVarDecl())
2320 return TentativeDefinition;
2321
2322 // What's left is (in C, block-scope) declarations without initializers or
2323 // external storage. These are definitions.
2324 return Definition;
2325}
2326
2327VarDecl *VarDecl::getActingDefinition() {
2328 DefinitionKind Kind = isThisDeclarationADefinition();
2329 if (Kind != TentativeDefinition)
2330 return nullptr;
2331
2332 VarDecl *LastTentative = nullptr;
2333
2334 // Loop through the declaration chain, starting with the most recent.
2335 for (VarDecl *Decl = getMostRecentDecl(); Decl;
2336 Decl = Decl->getPreviousDecl()) {
2337 Kind = Decl->isThisDeclarationADefinition();
2338 if (Kind == Definition)
2339 return nullptr;
2340 // Record the first (most recent) TentativeDefinition that is encountered.
2341 if (Kind == TentativeDefinition && !LastTentative)
2342 LastTentative = Decl;
2343 }
2344
2345 return LastTentative;
2346}
2347
2348VarDecl *VarDecl::getDefinition(ASTContext &C) {
2349 VarDecl *First = getFirstDecl();
2350 for (auto *I : First->redecls()) {
2351 if (I->isThisDeclarationADefinition(C) == Definition)
2352 return I;
2353 }
2354 return nullptr;
2355}
2356
2357VarDecl::DefinitionKind VarDecl::hasDefinition(ASTContext &C) const {
2358 DefinitionKind Kind = DeclarationOnly;
2359
2360 const VarDecl *First = getFirstDecl();
2361 for (auto *I : First->redecls()) {
2362 Kind = std::max(a: Kind, b: I->isThisDeclarationADefinition(C));
2363 if (Kind == Definition)
2364 break;
2365 }
2366
2367 return Kind;
2368}
2369
2370const Expr *VarDecl::getAnyInitializer(const VarDecl *&D) const {
2371 for (auto *I : redecls()) {
2372 if (auto Expr = I->getInit()) {
2373 D = I;
2374 return Expr;
2375 }
2376 }
2377 return nullptr;
2378}
2379
2380bool VarDecl::hasInit() const {
2381 if (auto *P = dyn_cast<ParmVarDecl>(Val: this))
2382 if (P->hasUnparsedDefaultArg() || P->hasUninstantiatedDefaultArg())
2383 return false;
2384
2385 if (auto *Eval = getEvaluatedStmt())
2386 return Eval->Value.isValid();
2387
2388 return !Init.isNull();
2389}
2390
2391Expr *VarDecl::getInit() {
2392 if (!hasInit())
2393 return nullptr;
2394
2395 if (auto *S = Init.dyn_cast<Stmt *>())
2396 return cast<Expr>(Val: S);
2397
2398 auto *Eval = getEvaluatedStmt();
2399
2400 return cast<Expr>(Val: Eval->Value.get(
2401 Source: Eval->Value.isOffset() ? getASTContext().getExternalSource() : nullptr));
2402}
2403
2404Stmt **VarDecl::getInitAddress() {
2405 if (auto *ES = Init.dyn_cast<EvaluatedStmt *>())
2406 return ES->Value.getAddressOfPointer(Source: getASTContext().getExternalSource());
2407
2408 return Init.getAddrOfPtr1();
2409}
2410
2411VarDecl *VarDecl::getInitializingDeclaration() {
2412 VarDecl *Def = nullptr;
2413 for (auto *I : redecls()) {
2414 if (I->hasInit())
2415 return I;
2416
2417 if (I->isThisDeclarationADefinition()) {
2418 if (isStaticDataMember())
2419 return I;
2420 Def = I;
2421 }
2422 }
2423 return Def;
2424}
2425
2426bool VarDecl::isOutOfLine() const {
2427 if (Decl::isOutOfLine())
2428 return true;
2429
2430 if (!isStaticDataMember())
2431 return false;
2432
2433 // If this static data member was instantiated from a static data member of
2434 // a class template, check whether that static data member was defined
2435 // out-of-line.
2436 if (VarDecl *VD = getInstantiatedFromStaticDataMember())
2437 return VD->isOutOfLine();
2438
2439 return false;
2440}
2441
2442void VarDecl::setInit(Expr *I) {
2443 if (auto *Eval = Init.dyn_cast<EvaluatedStmt *>()) {
2444 Eval->~EvaluatedStmt();
2445 getASTContext().Deallocate(Ptr: Eval);
2446 }
2447
2448 Init = I;
2449}
2450
2451bool VarDecl::mightBeUsableInConstantExpressions(const ASTContext &C) const {
2452 const LangOptions &Lang = C.getLangOpts();
2453
2454 // OpenCL permits const integral variables to be used in constant
2455 // expressions, like in C++98.
2456 if (!Lang.CPlusPlus && !Lang.OpenCL && !Lang.C23)
2457 return false;
2458
2459 // Function parameters are never usable in constant expressions.
2460 if (isa<ParmVarDecl>(Val: this))
2461 return false;
2462
2463 // The values of weak variables are never usable in constant expressions.
2464 if (isWeak())
2465 return false;
2466
2467 // In C++11, any variable of reference type can be used in a constant
2468 // expression if it is initialized by a constant expression.
2469 if (Lang.CPlusPlus11 && getType()->isReferenceType())
2470 return true;
2471
2472 // Only const objects can be used in constant expressions in C++. C++98 does
2473 // not require the variable to be non-volatile, but we consider this to be a
2474 // defect.
2475 if (!getType().isConstant(Ctx: C) || getType().isVolatileQualified())
2476 return false;
2477
2478 // In C++, but not in C, const, non-volatile variables of integral or
2479 // enumeration types can be used in constant expressions.
2480 if (getType()->isIntegralOrEnumerationType() && !Lang.C23)
2481 return true;
2482
2483 // C23 6.6p7: An identifier that is:
2484 // ...
2485 // - declared with storage-class specifier constexpr and has an object type,
2486 // is a named constant, ... such a named constant is a constant expression
2487 // with the type and value of the declared object.
2488 // Additionally, in C++11, non-volatile constexpr variables can be used in
2489 // constant expressions.
2490 return (Lang.CPlusPlus11 || Lang.C23) && isConstexpr();
2491}
2492
2493bool VarDecl::isUsableInConstantExpressions(const ASTContext &Context) const {
2494 // C++2a [expr.const]p3:
2495 // A variable is usable in constant expressions after its initializing
2496 // declaration is encountered...
2497 const VarDecl *DefVD = nullptr;
2498 const Expr *Init = getAnyInitializer(D&: DefVD);
2499 if (!Init || Init->isValueDependent() || getType()->isDependentType())
2500 return false;
2501 // ... if it is a constexpr variable, or it is of reference type or of
2502 // const-qualified integral or enumeration type, ...
2503 if (!DefVD->mightBeUsableInConstantExpressions(C: Context))
2504 return false;
2505 // ... and its initializer is a constant initializer.
2506 if (Context.getLangOpts().CPlusPlus && !DefVD->hasConstantInitialization())
2507 return false;
2508 // C++98 [expr.const]p1:
2509 // An integral constant-expression can involve only [...] const variables
2510 // or static data members of integral or enumeration types initialized with
2511 // [integer] constant expressions (dcl.init)
2512 if ((Context.getLangOpts().CPlusPlus || Context.getLangOpts().OpenCL) &&
2513 !Context.getLangOpts().CPlusPlus11 && !DefVD->hasICEInitializer(Context))
2514 return false;
2515 return true;
2516}
2517
2518/// Convert the initializer for this declaration to the elaborated EvaluatedStmt
2519/// form, which contains extra information on the evaluated value of the
2520/// initializer.
2521EvaluatedStmt *VarDecl::ensureEvaluatedStmt() const {
2522 auto *Eval = Init.dyn_cast<EvaluatedStmt *>();
2523 if (!Eval) {
2524 // Note: EvaluatedStmt contains an APValue, which usually holds
2525 // resources not allocated from the ASTContext. We need to do some
2526 // work to avoid leaking those, but we do so in VarDecl::evaluateValue
2527 // where we can detect whether there's anything to clean up or not.
2528 Eval = new (getASTContext()) EvaluatedStmt;
2529 Eval->Value = Init.get<Stmt *>();
2530 Init = Eval;
2531 }
2532 return Eval;
2533}
2534
2535EvaluatedStmt *VarDecl::getEvaluatedStmt() const {
2536 return Init.dyn_cast<EvaluatedStmt *>();
2537}
2538
2539APValue *VarDecl::evaluateValue() const {
2540 SmallVector<PartialDiagnosticAt, 8> Notes;
2541 return evaluateValueImpl(Notes, IsConstantInitialization: hasConstantInitialization());
2542}
2543
2544APValue *VarDecl::evaluateValueImpl(SmallVectorImpl<PartialDiagnosticAt> &Notes,
2545 bool IsConstantInitialization) const {
2546 EvaluatedStmt *Eval = ensureEvaluatedStmt();
2547
2548 const auto *Init = getInit();
2549 assert(!Init->isValueDependent());
2550
2551 // We only produce notes indicating why an initializer is non-constant the
2552 // first time it is evaluated. FIXME: The notes won't always be emitted the
2553 // first time we try evaluation, so might not be produced at all.
2554 if (Eval->WasEvaluated)
2555 return Eval->Evaluated.isAbsent() ? nullptr : &Eval->Evaluated;
2556
2557 if (Eval->IsEvaluating) {
2558 // FIXME: Produce a diagnostic for self-initialization.
2559 return nullptr;
2560 }
2561
2562 Eval->IsEvaluating = true;
2563
2564 ASTContext &Ctx = getASTContext();
2565 bool Result = Init->EvaluateAsInitializer(Result&: Eval->Evaluated, Ctx, VD: this, Notes,
2566 IsConstantInitializer: IsConstantInitialization);
2567
2568 // In C++, or in C23 if we're initialising a 'constexpr' variable, this isn't
2569 // a constant initializer if we produced notes. In that case, we can't keep
2570 // the result, because it may only be correct under the assumption that the
2571 // initializer is a constant context.
2572 if (IsConstantInitialization &&
2573 (Ctx.getLangOpts().CPlusPlus ||
2574 (isConstexpr() && Ctx.getLangOpts().C23)) &&
2575 !Notes.empty())
2576 Result = false;
2577
2578 // Ensure the computed APValue is cleaned up later if evaluation succeeded,
2579 // or that it's empty (so that there's nothing to clean up) if evaluation
2580 // failed.
2581 if (!Result)
2582 Eval->Evaluated = APValue();
2583 else if (Eval->Evaluated.needsCleanup())
2584 Ctx.addDestruction(Ptr: &Eval->Evaluated);
2585
2586 Eval->IsEvaluating = false;
2587 Eval->WasEvaluated = true;
2588
2589 return Result ? &Eval->Evaluated : nullptr;
2590}
2591
2592APValue *VarDecl::getEvaluatedValue() const {
2593 if (EvaluatedStmt *Eval = getEvaluatedStmt())
2594 if (Eval->WasEvaluated)
2595 return &Eval->Evaluated;
2596
2597 return nullptr;
2598}
2599
2600bool VarDecl::hasICEInitializer(const ASTContext &Context) const {
2601 const Expr *Init = getInit();
2602 assert(Init && "no initializer");
2603
2604 EvaluatedStmt *Eval = ensureEvaluatedStmt();
2605 if (!Eval->CheckedForICEInit) {
2606 Eval->CheckedForICEInit = true;
2607 Eval->HasICEInit = Init->isIntegerConstantExpr(Ctx: Context);
2608 }
2609 return Eval->HasICEInit;
2610}
2611
2612bool VarDecl::hasConstantInitialization() const {
2613 // In C, all globals (and only globals) have constant initialization.
2614 if (hasGlobalStorage() && !getASTContext().getLangOpts().CPlusPlus)
2615 return true;
2616
2617 // In C++, it depends on whether the evaluation at the point of definition
2618 // was evaluatable as a constant initializer.
2619 if (EvaluatedStmt *Eval = getEvaluatedStmt())
2620 return Eval->HasConstantInitialization;
2621
2622 return false;
2623}
2624
2625bool VarDecl::checkForConstantInitialization(
2626 SmallVectorImpl<PartialDiagnosticAt> &Notes) const {
2627 EvaluatedStmt *Eval = ensureEvaluatedStmt();
2628 // If we ask for the value before we know whether we have a constant
2629 // initializer, we can compute the wrong value (for example, due to
2630 // std::is_constant_evaluated()).
2631 assert(!Eval->WasEvaluated &&
2632 "already evaluated var value before checking for constant init");
2633 assert((getASTContext().getLangOpts().CPlusPlus ||
2634 getASTContext().getLangOpts().C23) &&
2635 "only meaningful in C++/C23");
2636
2637 assert(!getInit()->isValueDependent());
2638
2639 // Evaluate the initializer to check whether it's a constant expression.
2640 Eval->HasConstantInitialization =
2641 evaluateValueImpl(Notes, IsConstantInitialization: true) && Notes.empty();
2642
2643 // If evaluation as a constant initializer failed, allow re-evaluation as a
2644 // non-constant initializer if we later find we want the value.
2645 if (!Eval->HasConstantInitialization)
2646 Eval->WasEvaluated = false;
2647
2648 return Eval->HasConstantInitialization;
2649}
2650
2651bool VarDecl::isParameterPack() const {
2652 return isa<PackExpansionType>(Val: getType());
2653}
2654
2655template<typename DeclT>
2656static DeclT *getDefinitionOrSelf(DeclT *D) {
2657 assert(D);
2658 if (auto *Def = D->getDefinition())
2659 return Def;
2660 return D;
2661}
2662
2663bool VarDecl::isEscapingByref() const {
2664 return hasAttr<BlocksAttr>() && NonParmVarDeclBits.EscapingByref;
2665}
2666
2667bool VarDecl::isNonEscapingByref() const {
2668 return hasAttr<BlocksAttr>() && !NonParmVarDeclBits.EscapingByref;
2669}
2670
2671bool VarDecl::hasDependentAlignment() const {
2672 QualType T = getType();
2673 return T->isDependentType() || T->isUndeducedType() ||
2674 llvm::any_of(Range: specific_attrs<AlignedAttr>(), P: [](const AlignedAttr *AA) {
2675 return AA->isAlignmentDependent();
2676 });
2677}
2678
2679VarDecl *VarDecl::getTemplateInstantiationPattern() const {
2680 const VarDecl *VD = this;
2681
2682 // If this is an instantiated member, walk back to the template from which
2683 // it was instantiated.
2684 if (MemberSpecializationInfo *MSInfo = VD->getMemberSpecializationInfo()) {
2685 if (isTemplateInstantiation(Kind: MSInfo->getTemplateSpecializationKind())) {
2686 VD = VD->getInstantiatedFromStaticDataMember();
2687 while (auto *NewVD = VD->getInstantiatedFromStaticDataMember())
2688 VD = NewVD;
2689 }
2690 }
2691
2692 // If it's an instantiated variable template specialization, find the
2693 // template or partial specialization from which it was instantiated.
2694 if (auto *VDTemplSpec = dyn_cast<VarTemplateSpecializationDecl>(Val: VD)) {
2695 if (isTemplateInstantiation(Kind: VDTemplSpec->getTemplateSpecializationKind())) {
2696 auto From = VDTemplSpec->getInstantiatedFrom();
2697 if (auto *VTD = From.dyn_cast<VarTemplateDecl *>()) {
2698 while (!VTD->isMemberSpecialization()) {
2699 auto *NewVTD = VTD->getInstantiatedFromMemberTemplate();
2700 if (!NewVTD)
2701 break;
2702 VTD = NewVTD;
2703 }
2704 return getDefinitionOrSelf(D: VTD->getTemplatedDecl());
2705 }
2706 if (auto *VTPSD =
2707 From.dyn_cast<VarTemplatePartialSpecializationDecl *>()) {
2708 while (!VTPSD->isMemberSpecialization()) {
2709 auto *NewVTPSD = VTPSD->getInstantiatedFromMember();
2710 if (!NewVTPSD)
2711 break;
2712 VTPSD = NewVTPSD;
2713 }
2714 return getDefinitionOrSelf<VarDecl>(D: VTPSD);
2715 }
2716 }
2717 }
2718
2719 // If this is the pattern of a variable template, find where it was
2720 // instantiated from. FIXME: Is this necessary?
2721 if (VarTemplateDecl *VarTemplate = VD->getDescribedVarTemplate()) {
2722 while (!VarTemplate->isMemberSpecialization()) {
2723 auto *NewVT = VarTemplate->getInstantiatedFromMemberTemplate();
2724 if (!NewVT)
2725 break;
2726 VarTemplate = NewVT;
2727 }
2728
2729 return getDefinitionOrSelf(D: VarTemplate->getTemplatedDecl());
2730 }
2731
2732 if (VD == this)
2733 return nullptr;
2734 return getDefinitionOrSelf(D: const_cast<VarDecl*>(VD));
2735}
2736
2737VarDecl *VarDecl::getInstantiatedFromStaticDataMember() const {
2738 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2739 return cast<VarDecl>(Val: MSI->getInstantiatedFrom());
2740
2741 return nullptr;
2742}
2743
2744TemplateSpecializationKind VarDecl::getTemplateSpecializationKind() const {
2745 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(Val: this))
2746 return Spec->getSpecializationKind();
2747
2748 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2749 return MSI->getTemplateSpecializationKind();
2750
2751 return TSK_Undeclared;
2752}
2753
2754TemplateSpecializationKind
2755VarDecl::getTemplateSpecializationKindForInstantiation() const {
2756 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2757 return MSI->getTemplateSpecializationKind();
2758
2759 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(Val: this))
2760 return Spec->getSpecializationKind();
2761
2762 return TSK_Undeclared;
2763}
2764
2765SourceLocation VarDecl::getPointOfInstantiation() const {
2766 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(Val: this))
2767 return Spec->getPointOfInstantiation();
2768
2769 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2770 return MSI->getPointOfInstantiation();
2771
2772 return SourceLocation();
2773}
2774
2775VarTemplateDecl *VarDecl::getDescribedVarTemplate() const {
2776 return getASTContext().getTemplateOrSpecializationInfo(Var: this)
2777 .dyn_cast<VarTemplateDecl *>();
2778}
2779
2780void VarDecl::setDescribedVarTemplate(VarTemplateDecl *Template) {
2781 getASTContext().setTemplateOrSpecializationInfo(Inst: this, TSI: Template);
2782}
2783
2784bool VarDecl::isKnownToBeDefined() const {
2785 const auto &LangOpts = getASTContext().getLangOpts();
2786 // In CUDA mode without relocatable device code, variables of form 'extern
2787 // __shared__ Foo foo[]' are pointers to the base of the GPU core's shared
2788 // memory pool. These are never undefined variables, even if they appear
2789 // inside of an anon namespace or static function.
2790 //
2791 // With CUDA relocatable device code enabled, these variables don't get
2792 // special handling; they're treated like regular extern variables.
2793 if (LangOpts.CUDA && !LangOpts.GPURelocatableDeviceCode &&
2794 hasExternalStorage() && hasAttr<CUDASharedAttr>() &&
2795 isa<IncompleteArrayType>(Val: getType()))
2796 return true;
2797
2798 return hasDefinition();
2799}
2800
2801bool VarDecl::isNoDestroy(const ASTContext &Ctx) const {
2802 return hasGlobalStorage() && (hasAttr<NoDestroyAttr>() ||
2803 (!Ctx.getLangOpts().RegisterStaticDestructors &&
2804 !hasAttr<AlwaysDestroyAttr>()));
2805}
2806
2807QualType::DestructionKind
2808VarDecl::needsDestruction(const ASTContext &Ctx) const {
2809 if (EvaluatedStmt *Eval = getEvaluatedStmt())
2810 if (Eval->HasConstantDestruction)
2811 return QualType::DK_none;
2812
2813 if (isNoDestroy(Ctx))
2814 return QualType::DK_none;
2815
2816 return getType().isDestructedType();
2817}
2818
2819bool VarDecl::hasFlexibleArrayInit(const ASTContext &Ctx) const {
2820 assert(hasInit() && "Expect initializer to check for flexible array init");
2821 auto *Ty = getType()->getAs<RecordType>();
2822 if (!Ty || !Ty->getDecl()->hasFlexibleArrayMember())
2823 return false;
2824 auto *List = dyn_cast<InitListExpr>(Val: getInit()->IgnoreParens());
2825 if (!List)
2826 return false;
2827 const Expr *FlexibleInit = List->getInit(Init: List->getNumInits() - 1);
2828 auto InitTy = Ctx.getAsConstantArrayType(T: FlexibleInit->getType());
2829 if (!InitTy)
2830 return false;
2831 return !InitTy->isZeroSize();
2832}
2833
2834CharUnits VarDecl::getFlexibleArrayInitChars(const ASTContext &Ctx) const {
2835 assert(hasInit() && "Expect initializer to check for flexible array init");
2836 auto *Ty = getType()->getAs<RecordType>();
2837 if (!Ty || !Ty->getDecl()->hasFlexibleArrayMember())
2838 return CharUnits::Zero();
2839 auto *List = dyn_cast<InitListExpr>(Val: getInit()->IgnoreParens());
2840 if (!List || List->getNumInits() == 0)
2841 return CharUnits::Zero();
2842 const Expr *FlexibleInit = List->getInit(Init: List->getNumInits() - 1);
2843 auto InitTy = Ctx.getAsConstantArrayType(T: FlexibleInit->getType());
2844 if (!InitTy)
2845 return CharUnits::Zero();
2846 CharUnits FlexibleArraySize = Ctx.getTypeSizeInChars(T: InitTy);
2847 const ASTRecordLayout &RL = Ctx.getASTRecordLayout(D: Ty->getDecl());
2848 CharUnits FlexibleArrayOffset =
2849 Ctx.toCharUnitsFromBits(BitSize: RL.getFieldOffset(FieldNo: RL.getFieldCount() - 1));
2850 if (FlexibleArrayOffset + FlexibleArraySize < RL.getSize())
2851 return CharUnits::Zero();
2852 return FlexibleArrayOffset + FlexibleArraySize - RL.getSize();
2853}
2854
2855MemberSpecializationInfo *VarDecl::getMemberSpecializationInfo() const {
2856 if (isStaticDataMember())
2857 // FIXME: Remove ?
2858 // return getASTContext().getInstantiatedFromStaticDataMember(this);
2859 return getASTContext().getTemplateOrSpecializationInfo(Var: this)
2860 .dyn_cast<MemberSpecializationInfo *>();
2861 return nullptr;
2862}
2863
2864void VarDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
2865 SourceLocation PointOfInstantiation) {
2866 assert((isa<VarTemplateSpecializationDecl>(this) ||
2867 getMemberSpecializationInfo()) &&
2868 "not a variable or static data member template specialization");
2869
2870 if (VarTemplateSpecializationDecl *Spec =
2871 dyn_cast<VarTemplateSpecializationDecl>(Val: this)) {
2872 Spec->setSpecializationKind(TSK);
2873 if (TSK != TSK_ExplicitSpecialization &&
2874 PointOfInstantiation.isValid() &&
2875 Spec->getPointOfInstantiation().isInvalid()) {
2876 Spec->setPointOfInstantiation(PointOfInstantiation);
2877 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
2878 L->InstantiationRequested(D: this);
2879 }
2880 } else if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo()) {
2881 MSI->setTemplateSpecializationKind(TSK);
2882 if (TSK != TSK_ExplicitSpecialization && PointOfInstantiation.isValid() &&
2883 MSI->getPointOfInstantiation().isInvalid()) {
2884 MSI->setPointOfInstantiation(PointOfInstantiation);
2885 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
2886 L->InstantiationRequested(D: this);
2887 }
2888 }
2889}
2890
2891void
2892VarDecl::setInstantiationOfStaticDataMember(VarDecl *VD,
2893 TemplateSpecializationKind TSK) {
2894 assert(getASTContext().getTemplateOrSpecializationInfo(this).isNull() &&
2895 "Previous template or instantiation?");
2896 getASTContext().setInstantiatedFromStaticDataMember(Inst: this, Tmpl: VD, TSK);
2897}
2898
2899//===----------------------------------------------------------------------===//
2900// ParmVarDecl Implementation
2901//===----------------------------------------------------------------------===//
2902
2903ParmVarDecl *ParmVarDecl::Create(ASTContext &C, DeclContext *DC,
2904 SourceLocation StartLoc, SourceLocation IdLoc,
2905 const IdentifierInfo *Id, QualType T,
2906 TypeSourceInfo *TInfo, StorageClass S,
2907 Expr *DefArg) {
2908 return new (C, DC) ParmVarDecl(ParmVar, C, DC, StartLoc, IdLoc, Id, T, TInfo,
2909 S, DefArg);
2910}
2911
2912QualType ParmVarDecl::getOriginalType() const {
2913 TypeSourceInfo *TSI = getTypeSourceInfo();
2914 QualType T = TSI ? TSI->getType() : getType();
2915 if (const auto *DT = dyn_cast<DecayedType>(Val&: T))
2916 return DT->getOriginalType();
2917 return T;
2918}
2919
2920ParmVarDecl *ParmVarDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID) {
2921 return new (C, ID)
2922 ParmVarDecl(ParmVar, C, nullptr, SourceLocation(), SourceLocation(),
2923 nullptr, QualType(), nullptr, SC_None, nullptr);
2924}
2925
2926SourceRange ParmVarDecl::getSourceRange() const {
2927 if (!hasInheritedDefaultArg()) {
2928 SourceRange ArgRange = getDefaultArgRange();
2929 if (ArgRange.isValid())
2930 return SourceRange(getOuterLocStart(), ArgRange.getEnd());
2931 }
2932
2933 // DeclaratorDecl considers the range of postfix types as overlapping with the
2934 // declaration name, but this is not the case with parameters in ObjC methods.
2935 if (isa<ObjCMethodDecl>(Val: getDeclContext()))
2936 return SourceRange(DeclaratorDecl::getBeginLoc(), getLocation());
2937
2938 return DeclaratorDecl::getSourceRange();
2939}
2940
2941bool ParmVarDecl::isDestroyedInCallee() const {
2942 // ns_consumed only affects code generation in ARC
2943 if (hasAttr<NSConsumedAttr>())
2944 return getASTContext().getLangOpts().ObjCAutoRefCount;
2945
2946 // FIXME: isParamDestroyedInCallee() should probably imply
2947 // isDestructedType()
2948 const auto *RT = getType()->getAs<RecordType>();
2949 if (RT && RT->getDecl()->isParamDestroyedInCallee() &&
2950 getType().isDestructedType())
2951 return true;
2952
2953 return false;
2954}
2955
2956Expr *ParmVarDecl::getDefaultArg() {
2957 assert(!hasUnparsedDefaultArg() && "Default argument is not yet parsed!");
2958 assert(!hasUninstantiatedDefaultArg() &&
2959 "Default argument is not yet instantiated!");
2960
2961 Expr *Arg = getInit();
2962 if (auto *E = dyn_cast_if_present<FullExpr>(Val: Arg))
2963 return E->getSubExpr();
2964
2965 return Arg;
2966}
2967
2968void ParmVarDecl::setDefaultArg(Expr *defarg) {
2969 ParmVarDeclBits.DefaultArgKind = DAK_Normal;
2970 Init = defarg;
2971}
2972
2973SourceRange ParmVarDecl::getDefaultArgRange() const {
2974 switch (ParmVarDeclBits.DefaultArgKind) {
2975 case DAK_None:
2976 case DAK_Unparsed:
2977 // Nothing we can do here.
2978 return SourceRange();
2979
2980 case DAK_Uninstantiated:
2981 return getUninstantiatedDefaultArg()->getSourceRange();
2982
2983 case DAK_Normal:
2984 if (const Expr *E = getInit())
2985 return E->getSourceRange();
2986
2987 // Missing an actual expression, may be invalid.
2988 return SourceRange();
2989 }
2990 llvm_unreachable("Invalid default argument kind.");
2991}
2992
2993void ParmVarDecl::setUninstantiatedDefaultArg(Expr *arg) {
2994 ParmVarDeclBits.DefaultArgKind = DAK_Uninstantiated;
2995 Init = arg;
2996}
2997
2998Expr *ParmVarDecl::getUninstantiatedDefaultArg() {
2999 assert(hasUninstantiatedDefaultArg() &&
3000 "Wrong kind of initialization expression!");
3001 return cast_if_present<Expr>(Val: Init.get<Stmt *>());
3002}
3003
3004bool ParmVarDecl::hasDefaultArg() const {
3005 // FIXME: We should just return false for DAK_None here once callers are
3006 // prepared for the case that we encountered an invalid default argument and
3007 // were unable to even build an invalid expression.
3008 return hasUnparsedDefaultArg() || hasUninstantiatedDefaultArg() ||
3009 !Init.isNull();
3010}
3011
3012void ParmVarDecl::setParameterIndexLarge(unsigned parameterIndex) {
3013 getASTContext().setParameterIndex(D: this, index: parameterIndex);
3014 ParmVarDeclBits.ParameterIndex = ParameterIndexSentinel;
3015}
3016
3017unsigned ParmVarDecl::getParameterIndexLarge() const {
3018 return getASTContext().getParameterIndex(D: this);
3019}
3020
3021//===----------------------------------------------------------------------===//
3022// FunctionDecl Implementation
3023//===----------------------------------------------------------------------===//
3024
3025FunctionDecl::FunctionDecl(Kind DK, ASTContext &C, DeclContext *DC,
3026 SourceLocation StartLoc,
3027 const DeclarationNameInfo &NameInfo, QualType T,
3028 TypeSourceInfo *TInfo, StorageClass S,
3029 bool UsesFPIntrin, bool isInlineSpecified,
3030 ConstexprSpecKind ConstexprKind,
3031 Expr *TrailingRequiresClause)
3032 : DeclaratorDecl(DK, DC, NameInfo.getLoc(), NameInfo.getName(), T, TInfo,
3033 StartLoc),
3034 DeclContext(DK), redeclarable_base(C), Body(), ODRHash(0),
3035 EndRangeLoc(NameInfo.getEndLoc()), DNLoc(NameInfo.getInfo()) {
3036 assert(T.isNull() || T->isFunctionType());
3037 FunctionDeclBits.SClass = S;
3038 FunctionDeclBits.IsInline = isInlineSpecified;
3039 FunctionDeclBits.IsInlineSpecified = isInlineSpecified;
3040 FunctionDeclBits.IsVirtualAsWritten = false;
3041 FunctionDeclBits.IsPureVirtual = false;
3042 FunctionDeclBits.HasInheritedPrototype = false;
3043 FunctionDeclBits.HasWrittenPrototype = true;
3044 FunctionDeclBits.IsDeleted = false;
3045 FunctionDeclBits.IsTrivial = false;
3046 FunctionDeclBits.IsTrivialForCall = false;
3047 FunctionDeclBits.IsDefaulted = false;
3048 FunctionDeclBits.IsExplicitlyDefaulted = false;
3049 FunctionDeclBits.HasDefaultedOrDeletedInfo = false;
3050 FunctionDeclBits.IsIneligibleOrNotSelected = false;
3051 FunctionDeclBits.HasImplicitReturnZero = false;
3052 FunctionDeclBits.IsLateTemplateParsed = false;
3053 FunctionDeclBits.ConstexprKind = static_cast<uint64_t>(ConstexprKind);
3054 FunctionDeclBits.BodyContainsImmediateEscalatingExpression = false;
3055 FunctionDeclBits.InstantiationIsPending = false;
3056 FunctionDeclBits.UsesSEHTry = false;
3057 FunctionDeclBits.UsesFPIntrin = UsesFPIntrin;
3058 FunctionDeclBits.HasSkippedBody = false;
3059 FunctionDeclBits.WillHaveBody = false;
3060 FunctionDeclBits.IsMultiVersion = false;
3061 FunctionDeclBits.DeductionCandidateKind =
3062 static_cast<unsigned char>(DeductionCandidate::Normal);
3063 FunctionDeclBits.HasODRHash = false;
3064 FunctionDeclBits.FriendConstraintRefersToEnclosingTemplate = false;
3065 if (TrailingRequiresClause)
3066 setTrailingRequiresClause(TrailingRequiresClause);
3067}
3068
3069void FunctionDecl::getNameForDiagnostic(
3070 raw_ostream &OS, const PrintingPolicy &Policy, bool Qualified) const {
3071 NamedDecl::getNameForDiagnostic(OS, Policy, Qualified);
3072 const TemplateArgumentList *TemplateArgs = getTemplateSpecializationArgs();
3073 if (TemplateArgs)
3074 printTemplateArgumentList(OS, Args: TemplateArgs->asArray(), Policy);
3075}
3076
3077bool FunctionDecl::isVariadic() const {
3078 if (const auto *FT = getType()->getAs<FunctionProtoType>())
3079 return FT->isVariadic();
3080 return false;
3081}
3082
3083FunctionDecl::DefaultedOrDeletedFunctionInfo *
3084FunctionDecl::DefaultedOrDeletedFunctionInfo::Create(
3085 ASTContext &Context, ArrayRef<DeclAccessPair> Lookups,
3086 StringLiteral *DeletedMessage) {
3087 static constexpr size_t Alignment =
3088 std::max(l: {alignof(DefaultedOrDeletedFunctionInfo),
3089 alignof(DeclAccessPair), alignof(StringLiteral *)});
3090 size_t Size = totalSizeToAlloc<DeclAccessPair, StringLiteral *>(
3091 Counts: Lookups.size(), Counts: DeletedMessage != nullptr);
3092
3093 DefaultedOrDeletedFunctionInfo *Info =
3094 new (Context.Allocate(Size, Align: Alignment)) DefaultedOrDeletedFunctionInfo;
3095 Info->NumLookups = Lookups.size();
3096 Info->HasDeletedMessage = DeletedMessage != nullptr;
3097
3098 std::uninitialized_copy(first: Lookups.begin(), last: Lookups.end(),
3099 result: Info->getTrailingObjects<DeclAccessPair>());
3100 if (DeletedMessage)
3101 *Info->getTrailingObjects<StringLiteral *>() = DeletedMessage;
3102 return Info;
3103}
3104
3105void FunctionDecl::setDefaultedOrDeletedInfo(
3106 DefaultedOrDeletedFunctionInfo *Info) {
3107 assert(!FunctionDeclBits.HasDefaultedOrDeletedInfo && "already have this");
3108 assert(!Body && "can't replace function body with defaulted function info");
3109
3110 FunctionDeclBits.HasDefaultedOrDeletedInfo = true;
3111 DefaultedOrDeletedInfo = Info;
3112}
3113
3114void FunctionDecl::setDeletedAsWritten(bool D, StringLiteral *Message) {
3115 FunctionDeclBits.IsDeleted = D;
3116
3117 if (Message) {
3118 assert(isDeletedAsWritten() && "Function must be deleted");
3119 if (FunctionDeclBits.HasDefaultedOrDeletedInfo)
3120 DefaultedOrDeletedInfo->setDeletedMessage(Message);
3121 else
3122 setDefaultedOrDeletedInfo(DefaultedOrDeletedFunctionInfo::Create(
3123 Context&: getASTContext(), /*Lookups=*/{}, DeletedMessage: Message));
3124 }
3125}
3126
3127void FunctionDecl::DefaultedOrDeletedFunctionInfo::setDeletedMessage(
3128 StringLiteral *Message) {
3129 // We should never get here with the DefaultedOrDeletedInfo populated, but
3130 // no space allocated for the deleted message, since that would require
3131 // recreating this, but setDefaultedOrDeletedInfo() disallows overwriting
3132 // an already existing DefaultedOrDeletedFunctionInfo.
3133 assert(HasDeletedMessage &&
3134 "No space to store a delete message in this DefaultedOrDeletedInfo");
3135 *getTrailingObjects<StringLiteral *>() = Message;
3136}
3137
3138FunctionDecl::DefaultedOrDeletedFunctionInfo *
3139FunctionDecl::getDefalutedOrDeletedInfo() const {
3140 return FunctionDeclBits.HasDefaultedOrDeletedInfo ? DefaultedOrDeletedInfo
3141 : nullptr;
3142}
3143
3144bool FunctionDecl::hasBody(const FunctionDecl *&Definition) const {
3145 for (const auto *I : redecls()) {
3146 if (I->doesThisDeclarationHaveABody()) {
3147 Definition = I;
3148 return true;
3149 }
3150 }
3151
3152 return false;
3153}
3154
3155bool FunctionDecl::hasTrivialBody() const {
3156 const Stmt *S = getBody();
3157 if (!S) {
3158 // Since we don't have a body for this function, we don't know if it's
3159 // trivial or not.
3160 return false;
3161 }
3162
3163 if (isa<CompoundStmt>(Val: S) && cast<CompoundStmt>(Val: S)->body_empty())
3164 return true;
3165 return false;
3166}
3167
3168bool FunctionDecl::isThisDeclarationInstantiatedFromAFriendDefinition() const {
3169 if (!getFriendObjectKind())
3170 return false;
3171
3172 // Check for a friend function instantiated from a friend function
3173 // definition in a templated class.
3174 if (const FunctionDecl *InstantiatedFrom =
3175 getInstantiatedFromMemberFunction())
3176 return InstantiatedFrom->getFriendObjectKind() &&
3177 InstantiatedFrom->isThisDeclarationADefinition();
3178
3179 // Check for a friend function template instantiated from a friend
3180 // function template definition in a templated class.
3181 if (const FunctionTemplateDecl *Template = getDescribedFunctionTemplate()) {
3182 if (const FunctionTemplateDecl *InstantiatedFrom =
3183 Template->getInstantiatedFromMemberTemplate())
3184 return InstantiatedFrom->getFriendObjectKind() &&
3185 InstantiatedFrom->isThisDeclarationADefinition();
3186 }
3187
3188 return false;
3189}
3190
3191bool FunctionDecl::isDefined(const FunctionDecl *&Definition,
3192 bool CheckForPendingFriendDefinition) const {
3193 for (const FunctionDecl *FD : redecls()) {
3194 if (FD->isThisDeclarationADefinition()) {
3195 Definition = FD;
3196 return true;
3197 }
3198
3199 // If this is a friend function defined in a class template, it does not
3200 // have a body until it is used, nevertheless it is a definition, see
3201 // [temp.inst]p2:
3202 //
3203 // ... for the purpose of determining whether an instantiated redeclaration
3204 // is valid according to [basic.def.odr] and [class.mem], a declaration that
3205 // corresponds to a definition in the template is considered to be a
3206 // definition.
3207 //
3208 // The following code must produce redefinition error:
3209 //
3210 // template<typename T> struct C20 { friend void func_20() {} };
3211 // C20<int> c20i;
3212 // void func_20() {}
3213 //
3214 if (CheckForPendingFriendDefinition &&
3215 FD->isThisDeclarationInstantiatedFromAFriendDefinition()) {
3216 Definition = FD;
3217 return true;
3218 }
3219 }
3220
3221 return false;
3222}
3223
3224Stmt *FunctionDecl::getBody(const FunctionDecl *&Definition) const {
3225 if (!hasBody(Definition))
3226 return nullptr;
3227
3228 assert(!Definition->FunctionDeclBits.HasDefaultedOrDeletedInfo &&
3229 "definition should not have a body");
3230 if (Definition->Body)
3231 return Definition->Body.get(Source: getASTContext().getExternalSource());
3232
3233 return nullptr;
3234}
3235
3236void FunctionDecl::setBody(Stmt *B) {
3237 FunctionDeclBits.HasDefaultedOrDeletedInfo = false;
3238 Body = LazyDeclStmtPtr(B);
3239 if (B)
3240 EndRangeLoc = B->getEndLoc();
3241}
3242
3243void FunctionDecl::setIsPureVirtual(bool P) {
3244 FunctionDeclBits.IsPureVirtual = P;
3245 if (P)
3246 if (auto *Parent = dyn_cast<CXXRecordDecl>(Val: getDeclContext()))
3247 Parent->markedVirtualFunctionPure();
3248}
3249
3250template<std::size_t Len>
3251static bool isNamed(const NamedDecl *ND, const char (&Str)[Len]) {
3252 const IdentifierInfo *II = ND->getIdentifier();
3253 return II && II->isStr(Str);
3254}
3255
3256bool FunctionDecl::isImmediateEscalating() const {
3257 // C++23 [expr.const]/p17
3258 // An immediate-escalating function is
3259 // - the call operator of a lambda that is not declared with the consteval
3260 // specifier,
3261 if (isLambdaCallOperator(DC: this) && !isConsteval())
3262 return true;
3263 // - a defaulted special member function that is not declared with the
3264 // consteval specifier,
3265 if (isDefaulted() && !isConsteval())
3266 return true;
3267 // - a function that results from the instantiation of a templated entity
3268 // defined with the constexpr specifier.
3269 TemplatedKind TK = getTemplatedKind();
3270 if (TK != TK_NonTemplate && TK != TK_DependentNonTemplate &&
3271 isConstexprSpecified())
3272 return true;
3273 return false;
3274}
3275
3276bool FunctionDecl::isImmediateFunction() const {
3277 // C++23 [expr.const]/p18
3278 // An immediate function is a function or constructor that is
3279 // - declared with the consteval specifier
3280 if (isConsteval())
3281 return true;
3282 // - an immediate-escalating function F whose function body contains an
3283 // immediate-escalating expression
3284 if (isImmediateEscalating() && BodyContainsImmediateEscalatingExpressions())
3285 return true;
3286
3287 if (const auto *MD = dyn_cast<CXXMethodDecl>(Val: this);
3288 MD && MD->isLambdaStaticInvoker())
3289 return MD->getParent()->getLambdaCallOperator()->isImmediateFunction();
3290
3291 return false;
3292}
3293
3294bool FunctionDecl::isMain() const {
3295 const TranslationUnitDecl *tunit =
3296 dyn_cast<TranslationUnitDecl>(Val: getDeclContext()->getRedeclContext());
3297 return tunit &&
3298 !tunit->getASTContext().getLangOpts().Freestanding &&
3299 isNamed(ND: this, Str: "main");
3300}
3301
3302bool FunctionDecl::isMSVCRTEntryPoint() const {
3303 const TranslationUnitDecl *TUnit =
3304 dyn_cast<TranslationUnitDecl>(Val: getDeclContext()->getRedeclContext());
3305 if (!TUnit)
3306 return false;
3307
3308 // Even though we aren't really targeting MSVCRT if we are freestanding,
3309 // semantic analysis for these functions remains the same.
3310
3311 // MSVCRT entry points only exist on MSVCRT targets.
3312 if (!TUnit->getASTContext().getTargetInfo().getTriple().isOSMSVCRT())
3313 return false;
3314
3315 // Nameless functions like constructors cannot be entry points.
3316 if (!getIdentifier())
3317 return false;
3318
3319 return llvm::StringSwitch<bool>(getName())
3320 .Cases(S0: "main", // an ANSI console app
3321 S1: "wmain", // a Unicode console App
3322 S2: "WinMain", // an ANSI GUI app
3323 S3: "wWinMain", // a Unicode GUI app
3324 S4: "DllMain", // a DLL
3325 Value: true)
3326 .Default(Value: false);
3327}
3328
3329bool FunctionDecl::isReservedGlobalPlacementOperator() const {
3330 if (getDeclName().getNameKind() != DeclarationName::CXXOperatorName)
3331 return false;
3332 if (getDeclName().getCXXOverloadedOperator() != OO_New &&
3333 getDeclName().getCXXOverloadedOperator() != OO_Delete &&
3334 getDeclName().getCXXOverloadedOperator() != OO_Array_New &&
3335 getDeclName().getCXXOverloadedOperator() != OO_Array_Delete)
3336 return false;
3337
3338 if (!getDeclContext()->getRedeclContext()->isTranslationUnit())
3339 return false;
3340
3341 const auto *proto = getType()->castAs<FunctionProtoType>();
3342 if (proto->getNumParams() != 2 || proto->isVariadic())
3343 return false;
3344
3345 const ASTContext &Context =
3346 cast<TranslationUnitDecl>(Val: getDeclContext()->getRedeclContext())
3347 ->getASTContext();
3348
3349 // The result type and first argument type are constant across all
3350 // these operators. The second argument must be exactly void*.
3351 return (proto->getParamType(i: 1).getCanonicalType() == Context.VoidPtrTy);
3352}
3353
3354bool FunctionDecl::isReplaceableGlobalAllocationFunction(
3355 std::optional<unsigned> *AlignmentParam, bool *IsNothrow) const {
3356 if (getDeclName().getNameKind() != DeclarationName::CXXOperatorName)
3357 return false;
3358 if (getDeclName().getCXXOverloadedOperator() != OO_New &&
3359 getDeclName().getCXXOverloadedOperator() != OO_Delete &&
3360 getDeclName().getCXXOverloadedOperator() != OO_Array_New &&
3361 getDeclName().getCXXOverloadedOperator() != OO_Array_Delete)
3362 return false;
3363
3364 if (isa<CXXRecordDecl>(Val: getDeclContext()))
3365 return false;
3366
3367 // This can only fail for an invalid 'operator new' declaration.
3368 if (!getDeclContext()->getRedeclContext()->isTranslationUnit())
3369 return false;
3370
3371 const auto *FPT = getType()->castAs<FunctionProtoType>();
3372 if (FPT->getNumParams() == 0 || FPT->getNumParams() > 4 || FPT->isVariadic())
3373 return false;
3374
3375 // If this is a single-parameter function, it must be a replaceable global
3376 // allocation or deallocation function.
3377 if (FPT->getNumParams() == 1)
3378 return true;
3379
3380 unsigned Params = 1;
3381 QualType Ty = FPT->getParamType(i: Params);
3382 const ASTContext &Ctx = getASTContext();
3383
3384 auto Consume = [&] {
3385 ++Params;
3386 Ty = Params < FPT->getNumParams() ? FPT->getParamType(i: Params) : QualType();
3387 };
3388
3389 // In C++14, the next parameter can be a 'std::size_t' for sized delete.
3390 bool IsSizedDelete = false;
3391 if (Ctx.getLangOpts().SizedDeallocation &&
3392 (getDeclName().getCXXOverloadedOperator() == OO_Delete ||
3393 getDeclName().getCXXOverloadedOperator() == OO_Array_Delete) &&
3394 Ctx.hasSameType(T1: Ty, T2: Ctx.getSizeType())) {
3395 IsSizedDelete = true;
3396 Consume();
3397 }
3398
3399 // In C++17, the next parameter can be a 'std::align_val_t' for aligned
3400 // new/delete.
3401 if (Ctx.getLangOpts().AlignedAllocation && !Ty.isNull() && Ty->isAlignValT()) {
3402 Consume();
3403 if (AlignmentParam)
3404 *AlignmentParam = Params;
3405 }
3406
3407 // If this is not a sized delete, the next parameter can be a
3408 // 'const std::nothrow_t&'.
3409 if (!IsSizedDelete && !Ty.isNull() && Ty->isReferenceType()) {
3410 Ty = Ty->getPointeeType();
3411 if (Ty.getCVRQualifiers() != Qualifiers::Const)
3412 return false;
3413 if (Ty->isNothrowT()) {
3414 if (IsNothrow)
3415 *IsNothrow = true;
3416 Consume();
3417 }
3418 }
3419
3420 // Finally, recognize the not yet standard versions of new that take a
3421 // hot/cold allocation hint (__hot_cold_t). These are currently supported by
3422 // tcmalloc (see
3423 // https://github.com/google/tcmalloc/blob/220043886d4e2efff7a5702d5172cb8065253664/tcmalloc/malloc_extension.h#L53).
3424 if (!IsSizedDelete && !Ty.isNull() && Ty->isEnumeralType()) {
3425 QualType T = Ty;
3426 while (const auto *TD = T->getAs<TypedefType>())
3427 T = TD->getDecl()->getUnderlyingType();
3428 const IdentifierInfo *II =
3429 T->castAs<EnumType>()->getDecl()->getIdentifier();
3430 if (II && II->isStr(Str: "__hot_cold_t"))
3431 Consume();
3432 }
3433
3434 return Params == FPT->getNumParams();
3435}
3436
3437bool FunctionDecl::isInlineBuiltinDeclaration() const {
3438 if (!getBuiltinID())
3439 return false;
3440
3441 const FunctionDecl *Definition;
3442 if (!hasBody(Definition))
3443 return false;
3444
3445 if (!Definition->isInlineSpecified() ||
3446 !Definition->hasAttr<AlwaysInlineAttr>())
3447 return false;
3448
3449 ASTContext &Context = getASTContext();
3450 switch (Context.GetGVALinkageForFunction(FD: Definition)) {
3451 case GVA_Internal:
3452 case GVA_DiscardableODR:
3453 case GVA_StrongODR:
3454 return false;
3455 case GVA_AvailableExternally:
3456 case GVA_StrongExternal:
3457 return true;
3458 }
3459 llvm_unreachable("Unknown GVALinkage");
3460}
3461
3462bool FunctionDecl::isDestroyingOperatorDelete() const {
3463 // C++ P0722:
3464 // Within a class C, a single object deallocation function with signature
3465 // (T, std::destroying_delete_t, <more params>)
3466 // is a destroying operator delete.
3467 if (!isa<CXXMethodDecl>(Val: this) || getOverloadedOperator() != OO_Delete ||
3468 getNumParams() < 2)
3469 return false;
3470
3471 auto *RD = getParamDecl(i: 1)->getType()->getAsCXXRecordDecl();
3472 return RD && RD->isInStdNamespace() && RD->getIdentifier() &&
3473 RD->getIdentifier()->isStr(Str: "destroying_delete_t");
3474}
3475
3476LanguageLinkage FunctionDecl::getLanguageLinkage() const {
3477 return getDeclLanguageLinkage(D: *this);
3478}
3479
3480bool FunctionDecl::isExternC() const {
3481 return isDeclExternC(D: *this);
3482}
3483
3484bool FunctionDecl::isInExternCContext() const {
3485 if (hasAttr<OpenCLKernelAttr>())
3486 return true;
3487 return getLexicalDeclContext()->isExternCContext();
3488}
3489
3490bool FunctionDecl::isInExternCXXContext() const {
3491 return getLexicalDeclContext()->isExternCXXContext();
3492}
3493
3494bool FunctionDecl::isGlobal() const {
3495 if (const auto *Method = dyn_cast<CXXMethodDecl>(Val: this))
3496 return Method->isStatic();
3497
3498 if (getCanonicalDecl()->getStorageClass() == SC_Static)
3499 return false;
3500
3501 for (const DeclContext *DC = getDeclContext();
3502 DC->isNamespace();
3503 DC = DC->getParent()) {
3504 if (const auto *Namespace = cast<NamespaceDecl>(Val: DC)) {
3505 if (!Namespace->getDeclName())
3506 return false;
3507 }
3508 }
3509
3510 return true;
3511}
3512
3513bool FunctionDecl::isNoReturn() const {
3514 if (hasAttr<NoReturnAttr>() || hasAttr<CXX11NoReturnAttr>() ||
3515 hasAttr<C11NoReturnAttr>())
3516 return true;
3517
3518 if (auto *FnTy = getType()->getAs<FunctionType>())
3519 return FnTy->getNoReturnAttr();
3520
3521 return false;
3522}
3523
3524bool FunctionDecl::isMemberLikeConstrainedFriend() const {
3525 // C++20 [temp.friend]p9:
3526 // A non-template friend declaration with a requires-clause [or]
3527 // a friend function template with a constraint that depends on a template
3528 // parameter from an enclosing template [...] does not declare the same
3529 // function or function template as a declaration in any other scope.
3530
3531 // If this isn't a friend then it's not a member-like constrained friend.
3532 if (!getFriendObjectKind()) {
3533 return false;
3534 }
3535
3536 if (!getDescribedFunctionTemplate()) {
3537 // If these friends don't have constraints, they aren't constrained, and
3538 // thus don't fall under temp.friend p9. Else the simple presence of a
3539 // constraint makes them unique.
3540 return getTrailingRequiresClause();
3541 }
3542
3543 return FriendConstraintRefersToEnclosingTemplate();
3544}
3545
3546MultiVersionKind FunctionDecl::getMultiVersionKind() const {
3547 if (hasAttr<TargetAttr>())
3548 return MultiVersionKind::Target;
3549 if (hasAttr<TargetVersionAttr>())
3550 return MultiVersionKind::TargetVersion;
3551 if (hasAttr<CPUDispatchAttr>())
3552 return MultiVersionKind::CPUDispatch;
3553 if (hasAttr<CPUSpecificAttr>())
3554 return MultiVersionKind::CPUSpecific;
3555 if (hasAttr<TargetClonesAttr>())
3556 return MultiVersionKind::TargetClones;
3557 return MultiVersionKind::None;
3558}
3559
3560bool FunctionDecl::isCPUDispatchMultiVersion() const {
3561 return isMultiVersion() && hasAttr<CPUDispatchAttr>();
3562}
3563
3564bool FunctionDecl::isCPUSpecificMultiVersion() const {
3565 return isMultiVersion() && hasAttr<CPUSpecificAttr>();
3566}
3567
3568bool FunctionDecl::isTargetMultiVersion() const {
3569 return isMultiVersion() &&
3570 (hasAttr<TargetAttr>() || hasAttr<TargetVersionAttr>());
3571}
3572
3573bool FunctionDecl::isTargetMultiVersionDefault() const {
3574 if (!isMultiVersion())
3575 return false;
3576 if (hasAttr<TargetAttr>())
3577 return getAttr<TargetAttr>()->isDefaultVersion();
3578 return hasAttr<TargetVersionAttr>() &&
3579 getAttr<TargetVersionAttr>()->isDefaultVersion();
3580}
3581
3582bool FunctionDecl::isTargetClonesMultiVersion() const {
3583 return isMultiVersion() && hasAttr<TargetClonesAttr>();
3584}
3585
3586bool FunctionDecl::isTargetVersionMultiVersion() const {
3587 return isMultiVersion() && hasAttr<TargetVersionAttr>();
3588}
3589
3590void
3591FunctionDecl::setPreviousDeclaration(FunctionDecl *PrevDecl) {
3592 redeclarable_base::setPreviousDecl(PrevDecl);
3593
3594 if (FunctionTemplateDecl *FunTmpl = getDescribedFunctionTemplate()) {
3595 FunctionTemplateDecl *PrevFunTmpl
3596 = PrevDecl? PrevDecl->getDescribedFunctionTemplate() : nullptr;
3597 assert((!PrevDecl || PrevFunTmpl) && "Function/function template mismatch");
3598 FunTmpl->setPreviousDecl(PrevFunTmpl);
3599 }
3600
3601 if (PrevDecl && PrevDecl->isInlined())
3602 setImplicitlyInline(true);
3603}
3604
3605FunctionDecl *FunctionDecl::getCanonicalDecl() { return getFirstDecl(); }
3606
3607/// Returns a value indicating whether this function corresponds to a builtin
3608/// function.
3609///
3610/// The function corresponds to a built-in function if it is declared at
3611/// translation scope or within an extern "C" block and its name matches with
3612/// the name of a builtin. The returned value will be 0 for functions that do
3613/// not correspond to a builtin, a value of type \c Builtin::ID if in the
3614/// target-independent range \c [1,Builtin::First), or a target-specific builtin
3615/// value.
3616///
3617/// \param ConsiderWrapperFunctions If true, we should consider wrapper
3618/// functions as their wrapped builtins. This shouldn't be done in general, but
3619/// it's useful in Sema to diagnose calls to wrappers based on their semantics.
3620unsigned FunctionDecl::getBuiltinID(bool ConsiderWrapperFunctions) const {
3621 unsigned BuiltinID = 0;
3622
3623 if (const auto *ABAA = getAttr<ArmBuiltinAliasAttr>()) {
3624 BuiltinID = ABAA->getBuiltinName()->getBuiltinID();
3625 } else if (const auto *BAA = getAttr<BuiltinAliasAttr>()) {
3626 BuiltinID = BAA->getBuiltinName()->getBuiltinID();
3627 } else if (const auto *A = getAttr<BuiltinAttr>()) {
3628 BuiltinID = A->getID();
3629 }
3630
3631 if (!BuiltinID)
3632 return 0;
3633
3634 // If the function is marked "overloadable", it has a different mangled name
3635 // and is not the C library function.
3636 if (!ConsiderWrapperFunctions && hasAttr<OverloadableAttr>() &&
3637 (!hasAttr<ArmBuiltinAliasAttr>() && !hasAttr<BuiltinAliasAttr>()))
3638 return 0;
3639
3640 const ASTContext &Context = getASTContext();
3641 if (!Context.BuiltinInfo.isPredefinedLibFunction(ID: BuiltinID))
3642 return BuiltinID;
3643
3644 // This function has the name of a known C library
3645 // function. Determine whether it actually refers to the C library
3646 // function or whether it just has the same name.
3647
3648 // If this is a static function, it's not a builtin.
3649 if (!ConsiderWrapperFunctions && getStorageClass() == SC_Static)
3650 return 0;
3651
3652 // OpenCL v1.2 s6.9.f - The library functions defined in
3653 // the C99 standard headers are not available.
3654 if (Context.getLangOpts().OpenCL &&
3655 Context.BuiltinInfo.isPredefinedLibFunction(ID: BuiltinID))
3656 return 0;
3657
3658 // CUDA does not have device-side standard library. printf and malloc are the
3659 // only special cases that are supported by device-side runtime.
3660 if (Context.getLangOpts().CUDA && hasAttr<CUDADeviceAttr>() &&
3661 !hasAttr<CUDAHostAttr>() &&
3662 !(BuiltinID == Builtin::BIprintf || BuiltinID == Builtin::BImalloc))
3663 return 0;
3664
3665 // As AMDGCN implementation of OpenMP does not have a device-side standard
3666 // library, none of the predefined library functions except printf and malloc
3667 // should be treated as a builtin i.e. 0 should be returned for them.
3668 if (Context.getTargetInfo().getTriple().isAMDGCN() &&
3669 Context.getLangOpts().OpenMPIsTargetDevice &&
3670 Context.BuiltinInfo.isPredefinedLibFunction(ID: BuiltinID) &&
3671 !(BuiltinID == Builtin::BIprintf || BuiltinID == Builtin::BImalloc))
3672 return 0;
3673
3674 return BuiltinID;
3675}
3676
3677/// getNumParams - Return the number of parameters this function must have
3678/// based on its FunctionType. This is the length of the ParamInfo array
3679/// after it has been created.
3680unsigned FunctionDecl::getNumParams() const {
3681 const auto *FPT = getType()->getAs<FunctionProtoType>();
3682 return FPT ? FPT->getNumParams() : 0;
3683}
3684
3685void FunctionDecl::setParams(ASTContext &C,
3686 ArrayRef<ParmVarDecl *> NewParamInfo) {
3687 assert(!ParamInfo && "Already has param info!");
3688 assert(NewParamInfo.size() == getNumParams() && "Parameter count mismatch!");
3689
3690 // Zero params -> null pointer.
3691 if (!NewParamInfo.empty()) {
3692 ParamInfo = new (C) ParmVarDecl*[NewParamInfo.size()];
3693 std::copy(NewParamInfo.begin(), NewParamInfo.end(), ParamInfo);
3694 }
3695}
3696
3697/// getMinRequiredArguments - Returns the minimum number of arguments
3698/// needed to call this function. This may be fewer than the number of
3699/// function parameters, if some of the parameters have default
3700/// arguments (in C++) or are parameter packs (C++11).
3701unsigned FunctionDecl::getMinRequiredArguments() const {
3702 if (!getASTContext().getLangOpts().CPlusPlus)
3703 return getNumParams();
3704
3705 // Note that it is possible for a parameter with no default argument to
3706 // follow a parameter with a default argument.
3707 unsigned NumRequiredArgs = 0;
3708 unsigned MinParamsSoFar = 0;
3709 for (auto *Param : parameters()) {
3710 if (!Param->isParameterPack()) {
3711 ++MinParamsSoFar;
3712 if (!Param->hasDefaultArg())
3713 NumRequiredArgs = MinParamsSoFar;
3714 }
3715 }
3716 return NumRequiredArgs;
3717}
3718
3719bool FunctionDecl::hasCXXExplicitFunctionObjectParameter() const {
3720 return getNumParams() != 0 && getParamDecl(i: 0)->isExplicitObjectParameter();
3721}
3722
3723unsigned FunctionDecl::getNumNonObjectParams() const {
3724 return getNumParams() -
3725 static_cast<unsigned>(hasCXXExplicitFunctionObjectParameter());
3726}
3727
3728unsigned FunctionDecl::getMinRequiredExplicitArguments() const {
3729 return getMinRequiredArguments() -
3730 static_cast<unsigned>(hasCXXExplicitFunctionObjectParameter());
3731}
3732
3733bool FunctionDecl::hasOneParamOrDefaultArgs() const {
3734 return getNumParams() == 1 ||
3735 (getNumParams() > 1 &&
3736 llvm::all_of(Range: llvm::drop_begin(RangeOrContainer: parameters()),
3737 P: [](ParmVarDecl *P) { return P->hasDefaultArg(); }));
3738}
3739
3740/// The combination of the extern and inline keywords under MSVC forces
3741/// the function to be required.
3742///
3743/// Note: This function assumes that we will only get called when isInlined()
3744/// would return true for this FunctionDecl.
3745bool FunctionDecl::isMSExternInline() const {
3746 assert(isInlined() && "expected to get called on an inlined function!");
3747
3748 const ASTContext &Context = getASTContext();
3749 if (!Context.getTargetInfo().getCXXABI().isMicrosoft() &&
3750 !hasAttr<DLLExportAttr>())
3751 return false;
3752
3753 for (const FunctionDecl *FD = getMostRecentDecl(); FD;
3754 FD = FD->getPreviousDecl())
3755 if (!FD->isImplicit() && FD->getStorageClass() == SC_Extern)
3756 return true;
3757
3758 return false;
3759}
3760
3761static bool redeclForcesDefMSVC(const FunctionDecl *Redecl) {
3762 if (Redecl->getStorageClass() != SC_Extern)
3763 return false;
3764
3765 for (const FunctionDecl *FD = Redecl->getPreviousDecl(); FD;
3766 FD = FD->getPreviousDecl())
3767 if (!FD->isImplicit() && FD->getStorageClass() == SC_Extern)
3768 return false;
3769
3770 return true;
3771}
3772
3773static bool RedeclForcesDefC99(const FunctionDecl *Redecl) {
3774 // Only consider file-scope declarations in this test.
3775 if (!Redecl->getLexicalDeclContext()->isTranslationUnit())
3776 return false;
3777
3778 // Only consider explicit declarations; the presence of a builtin for a
3779 // libcall shouldn't affect whether a definition is externally visible.
3780 if (Redecl->isImplicit())
3781 return false;
3782
3783 if (!Redecl->isInlineSpecified() || Redecl->getStorageClass() == SC_Extern)
3784 return true; // Not an inline definition
3785
3786 return false;
3787}
3788
3789/// For a function declaration in C or C++, determine whether this
3790/// declaration causes the definition to be externally visible.
3791///
3792/// For instance, this determines if adding the current declaration to the set
3793/// of redeclarations of the given functions causes
3794/// isInlineDefinitionExternallyVisible to change from false to true.
3795bool FunctionDecl::doesDeclarationForceExternallyVisibleDefinition() const {
3796 assert(!doesThisDeclarationHaveABody() &&
3797 "Must have a declaration without a body.");
3798
3799 const ASTContext &Context = getASTContext();
3800
3801 if (Context.getLangOpts().MSVCCompat) {
3802 const FunctionDecl *Definition;
3803 if (hasBody(Definition) && Definition->isInlined() &&
3804 redeclForcesDefMSVC(Redecl: this))
3805 return true;
3806 }
3807
3808 if (Context.getLangOpts().CPlusPlus)
3809 return false;
3810
3811 if (Context.getLangOpts().GNUInline || hasAttr<GNUInlineAttr>()) {
3812 // With GNU inlining, a declaration with 'inline' but not 'extern', forces
3813 // an externally visible definition.
3814 //
3815 // FIXME: What happens if gnu_inline gets added on after the first
3816 // declaration?
3817 if (!isInlineSpecified() || getStorageClass() == SC_Extern)
3818 return false;
3819
3820 const FunctionDecl *Prev = this;
3821 bool FoundBody = false;
3822 while ((Prev = Prev->getPreviousDecl())) {
3823 FoundBody |= Prev->doesThisDeclarationHaveABody();
3824
3825 if (Prev->doesThisDeclarationHaveABody()) {
3826 // If it's not the case that both 'inline' and 'extern' are
3827 // specified on the definition, then it is always externally visible.
3828 if (!Prev->isInlineSpecified() ||
3829 Prev->getStorageClass() != SC_Extern)
3830 return false;
3831 } else if (Prev->isInlineSpecified() &&
3832 Prev->getStorageClass() != SC_Extern) {
3833 return false;
3834 }
3835 }
3836 return FoundBody;
3837 }
3838
3839 // C99 6.7.4p6:
3840 // [...] If all of the file scope declarations for a function in a
3841 // translation unit include the inline function specifier without extern,
3842 // then the definition in that translation unit is an inline definition.
3843 if (isInlineSpecified() && getStorageClass() != SC_Extern)
3844 return false;
3845 const FunctionDecl *Prev = this;
3846 bool FoundBody = false;
3847 while ((Prev = Prev->getPreviousDecl())) {
3848 FoundBody |= Prev->doesThisDeclarationHaveABody();
3849 if (RedeclForcesDefC99(Redecl: Prev))
3850 return false;
3851 }
3852 return FoundBody;
3853}
3854
3855FunctionTypeLoc FunctionDecl::getFunctionTypeLoc() const {
3856 const TypeSourceInfo *TSI = getTypeSourceInfo();
3857 return TSI ? TSI->getTypeLoc().IgnoreParens().getAs<FunctionTypeLoc>()
3858 : FunctionTypeLoc();
3859}
3860
3861SourceRange FunctionDecl::getReturnTypeSourceRange() const {
3862 FunctionTypeLoc FTL = getFunctionTypeLoc();
3863 if (!FTL)
3864 return SourceRange();
3865
3866 // Skip self-referential return types.
3867 const SourceManager &SM = getASTContext().getSourceManager();
3868 SourceRange RTRange = FTL.getReturnLoc().getSourceRange();
3869 SourceLocation Boundary = getNameInfo().getBeginLoc();
3870 if (RTRange.isInvalid() || Boundary.isInvalid() ||
3871 !SM.isBeforeInTranslationUnit(LHS: RTRange.getEnd(), RHS: Boundary))
3872 return SourceRange();
3873
3874 return RTRange;
3875}
3876
3877SourceRange FunctionDecl::getParametersSourceRange() const {
3878 unsigned NP = getNumParams();
3879 SourceLocation EllipsisLoc = getEllipsisLoc();
3880
3881 if (NP == 0 && EllipsisLoc.isInvalid())
3882 return SourceRange();
3883
3884 SourceLocation Begin =
3885 NP > 0 ? ParamInfo[0]->getSourceRange().getBegin() : EllipsisLoc;
3886 SourceLocation End = EllipsisLoc.isValid()
3887 ? EllipsisLoc
3888 : ParamInfo[NP - 1]->getSourceRange().getEnd();
3889
3890 return SourceRange(Begin, End);
3891}
3892
3893SourceRange FunctionDecl::getExceptionSpecSourceRange() const {
3894 FunctionTypeLoc FTL = getFunctionTypeLoc();
3895 return FTL ? FTL.getExceptionSpecRange() : SourceRange();
3896}
3897
3898/// For an inline function definition in C, or for a gnu_inline function
3899/// in C++, determine whether the definition will be externally visible.
3900///
3901/// Inline function definitions are always available for inlining optimizations.
3902/// However, depending on the language dialect, declaration specifiers, and
3903/// attributes, the definition of an inline function may or may not be
3904/// "externally" visible to other translation units in the program.
3905///
3906/// In C99, inline definitions are not externally visible by default. However,
3907/// if even one of the global-scope declarations is marked "extern inline", the
3908/// inline definition becomes externally visible (C99 6.7.4p6).
3909///
3910/// In GNU89 mode, or if the gnu_inline attribute is attached to the function
3911/// definition, we use the GNU semantics for inline, which are nearly the
3912/// opposite of C99 semantics. In particular, "inline" by itself will create
3913/// an externally visible symbol, but "extern inline" will not create an
3914/// externally visible symbol.
3915bool FunctionDecl::isInlineDefinitionExternallyVisible() const {
3916 assert((doesThisDeclarationHaveABody() || willHaveBody() ||
3917 hasAttr<AliasAttr>()) &&
3918 "Must be a function definition");
3919 assert(isInlined() && "Function must be inline");
3920 ASTContext &Context = getASTContext();
3921
3922 if (Context.getLangOpts().GNUInline || hasAttr<GNUInlineAttr>()) {
3923 // Note: If you change the logic here, please change
3924 // doesDeclarationForceExternallyVisibleDefinition as well.
3925 //
3926 // If it's not the case that both 'inline' and 'extern' are
3927 // specified on the definition, then this inline definition is
3928 // externally visible.
3929 if (Context.getLangOpts().CPlusPlus)
3930 return false;
3931 if (!(isInlineSpecified() && getStorageClass() == SC_Extern))
3932 return true;
3933
3934 // If any declaration is 'inline' but not 'extern', then this definition
3935 // is externally visible.
3936 for (auto *Redecl : redecls()) {
3937 if (Redecl->isInlineSpecified() &&
3938 Redecl->getStorageClass() != SC_Extern)
3939 return true;
3940 }
3941
3942 return false;
3943 }
3944
3945 // The rest of this function is C-only.
3946 assert(!Context.getLangOpts().CPlusPlus &&
3947 "should not use C inline rules in C++");
3948
3949 // C99 6.7.4p6:
3950 // [...] If all of the file scope declarations for a function in a
3951 // translation unit include the inline function specifier without extern,
3952 // then the definition in that translation unit is an inline definition.
3953 for (auto *Redecl : redecls()) {
3954 if (RedeclForcesDefC99(Redecl))
3955 return true;
3956 }
3957
3958 // C99 6.7.4p6:
3959 // An inline definition does not provide an external definition for the
3960 // function, and does not forbid an external definition in another
3961 // translation unit.
3962 return false;
3963}
3964
3965/// getOverloadedOperator - Which C++ overloaded operator this
3966/// function represents, if any.
3967OverloadedOperatorKind FunctionDecl::getOverloadedOperator() const {
3968 if (getDeclName().getNameKind() == DeclarationName::CXXOperatorName)
3969 return getDeclName().getCXXOverloadedOperator();
3970 return OO_None;
3971}
3972
3973/// getLiteralIdentifier - The literal suffix identifier this function
3974/// represents, if any.
3975const IdentifierInfo *FunctionDecl::getLiteralIdentifier() const {
3976 if (getDeclName().getNameKind() == DeclarationName::CXXLiteralOperatorName)
3977 return getDeclName().getCXXLiteralIdentifier();
3978 return nullptr;
3979}
3980
3981FunctionDecl::TemplatedKind FunctionDecl::getTemplatedKind() const {
3982 if (TemplateOrSpecialization.isNull())
3983 return TK_NonTemplate;
3984 if (const auto *ND = TemplateOrSpecialization.dyn_cast<NamedDecl *>()) {
3985 if (isa<FunctionDecl>(Val: ND))
3986 return TK_DependentNonTemplate;
3987 assert(isa<FunctionTemplateDecl>(ND) &&
3988 "No other valid types in NamedDecl");
3989 return TK_FunctionTemplate;
3990 }
3991 if (TemplateOrSpecialization.is<MemberSpecializationInfo *>())
3992 return TK_MemberSpecialization;
3993 if (TemplateOrSpecialization.is<FunctionTemplateSpecializationInfo *>())
3994 return TK_FunctionTemplateSpecialization;
3995 if (TemplateOrSpecialization.is
3996 <DependentFunctionTemplateSpecializationInfo*>())
3997 return TK_DependentFunctionTemplateSpecialization;
3998
3999 llvm_unreachable("Did we miss a TemplateOrSpecialization type?");
4000}
4001
4002FunctionDecl *FunctionDecl::getInstantiatedFromMemberFunction() const {
4003 if (MemberSpecializationInfo *Info = getMemberSpecializationInfo())
4004 return cast<FunctionDecl>(Val: Info->getInstantiatedFrom());
4005
4006 return nullptr;
4007}
4008
4009MemberSpecializationInfo *FunctionDecl::getMemberSpecializationInfo() const {
4010 if (auto *MSI =
4011 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
4012 return MSI;
4013 if (auto *FTSI = TemplateOrSpecialization
4014 .dyn_cast<FunctionTemplateSpecializationInfo *>())
4015 return FTSI->getMemberSpecializationInfo();
4016 return nullptr;
4017}
4018
4019void
4020FunctionDecl::setInstantiationOfMemberFunction(ASTContext &C,
4021 FunctionDecl *FD,
4022 TemplateSpecializationKind TSK) {
4023 assert(TemplateOrSpecialization.isNull() &&
4024 "Member function is already a specialization");
4025 MemberSpecializationInfo *Info
4026 = new (C) MemberSpecializationInfo(FD, TSK);
4027 TemplateOrSpecialization = Info;
4028}
4029
4030FunctionTemplateDecl *FunctionDecl::getDescribedFunctionTemplate() const {
4031 return dyn_cast_if_present<FunctionTemplateDecl>(
4032 Val: TemplateOrSpecialization.dyn_cast<NamedDecl *>());
4033}
4034
4035void FunctionDecl::setDescribedFunctionTemplate(
4036 FunctionTemplateDecl *Template) {
4037 assert(TemplateOrSpecialization.isNull() &&
4038 "Member function is already a specialization");
4039 TemplateOrSpecialization = Template;
4040}
4041
4042bool FunctionDecl::isFunctionTemplateSpecialization() const {
4043 return TemplateOrSpecialization.is<FunctionTemplateSpecializationInfo *>() ||
4044 TemplateOrSpecialization
4045 .is<DependentFunctionTemplateSpecializationInfo *>();
4046}
4047
4048void FunctionDecl::setInstantiatedFromDecl(FunctionDecl *FD) {
4049 assert(TemplateOrSpecialization.isNull() &&
4050 "Function is already a specialization");
4051 TemplateOrSpecialization = FD;
4052}
4053
4054FunctionDecl *FunctionDecl::getInstantiatedFromDecl() const {
4055 return dyn_cast_if_present<FunctionDecl>(
4056 Val: TemplateOrSpecialization.dyn_cast<NamedDecl *>());
4057}
4058
4059bool FunctionDecl::isImplicitlyInstantiable() const {
4060 // If the function is invalid, it can't be implicitly instantiated.
4061 if (isInvalidDecl())
4062 return false;
4063
4064 switch (getTemplateSpecializationKindForInstantiation()) {
4065 case TSK_Undeclared:
4066 case TSK_ExplicitInstantiationDefinition:
4067 case TSK_ExplicitSpecialization:
4068 return false;
4069
4070 case TSK_ImplicitInstantiation:
4071 return true;
4072
4073 case TSK_ExplicitInstantiationDeclaration:
4074 // Handled below.
4075 break;
4076 }
4077
4078 // Find the actual template from which we will instantiate.
4079 const FunctionDecl *PatternDecl = getTemplateInstantiationPattern();
4080 bool HasPattern = false;
4081 if (PatternDecl)
4082 HasPattern = PatternDecl->hasBody(Definition&: PatternDecl);
4083
4084 // C++0x [temp.explicit]p9:
4085 // Except for inline functions, other explicit instantiation declarations
4086 // have the effect of suppressing the implicit instantiation of the entity
4087 // to which they refer.
4088 if (!HasPattern || !PatternDecl)
4089 return true;
4090
4091 return PatternDecl->isInlined();
4092}
4093
4094bool FunctionDecl::isTemplateInstantiation() const {
4095 // FIXME: Remove this, it's not clear what it means. (Which template
4096 // specialization kind?)
4097 return clang::isTemplateInstantiation(Kind: getTemplateSpecializationKind());
4098}
4099
4100FunctionDecl *
4101FunctionDecl::getTemplateInstantiationPattern(bool ForDefinition) const {
4102 // If this is a generic lambda call operator specialization, its
4103 // instantiation pattern is always its primary template's pattern
4104 // even if its primary template was instantiated from another
4105 // member template (which happens with nested generic lambdas).
4106 // Since a lambda's call operator's body is transformed eagerly,
4107 // we don't have to go hunting for a prototype definition template
4108 // (i.e. instantiated-from-member-template) to use as an instantiation
4109 // pattern.
4110
4111 if (isGenericLambdaCallOperatorSpecialization(
4112 MD: dyn_cast<CXXMethodDecl>(Val: this))) {
4113 assert(getPrimaryTemplate() && "not a generic lambda call operator?");
4114 return getDefinitionOrSelf(D: getPrimaryTemplate()->getTemplatedDecl());
4115 }
4116
4117 // Check for a declaration of this function that was instantiated from a
4118 // friend definition.
4119 const FunctionDecl *FD = nullptr;
4120 if (!isDefined(Definition&: FD, /*CheckForPendingFriendDefinition=*/true))
4121 FD = this;
4122
4123 if (MemberSpecializationInfo *Info = FD->getMemberSpecializationInfo()) {
4124 if (ForDefinition &&
4125 !clang::isTemplateInstantiation(Kind: Info->getTemplateSpecializationKind()))
4126 return nullptr;
4127 return getDefinitionOrSelf(D: cast<FunctionDecl>(Val: Info->getInstantiatedFrom()));
4128 }
4129
4130 if (ForDefinition &&
4131 !clang::isTemplateInstantiation(Kind: getTemplateSpecializationKind()))
4132 return nullptr;
4133
4134 if (FunctionTemplateDecl *Primary = getPrimaryTemplate()) {
4135 // If we hit a point where the user provided a specialization of this
4136 // template, we're done looking.
4137 while (!ForDefinition || !Primary->isMemberSpecialization()) {
4138 auto *NewPrimary = Primary->getInstantiatedFromMemberTemplate();
4139 if (!NewPrimary)
4140 break;
4141 Primary = NewPrimary;
4142 }
4143
4144 return getDefinitionOrSelf(D: Primary->getTemplatedDecl());
4145 }
4146
4147 return nullptr;
4148}
4149
4150FunctionTemplateDecl *FunctionDecl::getPrimaryTemplate() const {
4151 if (FunctionTemplateSpecializationInfo *Info
4152 = TemplateOrSpecialization
4153 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
4154 return Info->getTemplate();
4155 }
4156 return nullptr;
4157}
4158
4159FunctionTemplateSpecializationInfo *
4160FunctionDecl::getTemplateSpecializationInfo() const {
4161 return TemplateOrSpecialization
4162 .dyn_cast<FunctionTemplateSpecializationInfo *>();
4163}
4164
4165const TemplateArgumentList *
4166FunctionDecl::getTemplateSpecializationArgs() const {
4167 if (FunctionTemplateSpecializationInfo *Info
4168 = TemplateOrSpecialization
4169 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
4170 return Info->TemplateArguments;
4171 }
4172 return nullptr;
4173}
4174
4175const ASTTemplateArgumentListInfo *
4176FunctionDecl::getTemplateSpecializationArgsAsWritten() const {
4177 if (FunctionTemplateSpecializationInfo *Info
4178 = TemplateOrSpecialization
4179 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
4180 return Info->TemplateArgumentsAsWritten;
4181 }
4182 if (DependentFunctionTemplateSpecializationInfo *Info =
4183 TemplateOrSpecialization
4184 .dyn_cast<DependentFunctionTemplateSpecializationInfo *>()) {
4185 return Info->TemplateArgumentsAsWritten;
4186 }
4187 return nullptr;
4188}
4189
4190void FunctionDecl::setFunctionTemplateSpecialization(
4191 ASTContext &C, FunctionTemplateDecl *Template,
4192 TemplateArgumentList *TemplateArgs, void *InsertPos,
4193 TemplateSpecializationKind TSK,
4194 const TemplateArgumentListInfo *TemplateArgsAsWritten,
4195 SourceLocation PointOfInstantiation) {
4196 assert((TemplateOrSpecialization.isNull() ||
4197 TemplateOrSpecialization.is<MemberSpecializationInfo *>()) &&
4198 "Member function is already a specialization");
4199 assert(TSK != TSK_Undeclared &&
4200 "Must specify the type of function template specialization");
4201 assert((TemplateOrSpecialization.isNull() ||
4202 getFriendObjectKind() != FOK_None ||
4203 TSK == TSK_ExplicitSpecialization) &&
4204 "Member specialization must be an explicit specialization");
4205 FunctionTemplateSpecializationInfo *Info =
4206 FunctionTemplateSpecializationInfo::Create(
4207 C, FD: this, Template, TSK, TemplateArgs, TemplateArgsAsWritten,
4208 POI: PointOfInstantiation,
4209 MSInfo: TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>());
4210 TemplateOrSpecialization = Info;
4211 Template->addSpecialization(Info, InsertPos);
4212}
4213
4214void FunctionDecl::setDependentTemplateSpecialization(
4215 ASTContext &Context, const UnresolvedSetImpl &Templates,
4216 const TemplateArgumentListInfo *TemplateArgs) {
4217 assert(TemplateOrSpecialization.isNull());
4218 DependentFunctionTemplateSpecializationInfo *Info =
4219 DependentFunctionTemplateSpecializationInfo::Create(Context, Candidates: Templates,
4220 TemplateArgs);
4221 TemplateOrSpecialization = Info;
4222}
4223
4224DependentFunctionTemplateSpecializationInfo *
4225FunctionDecl::getDependentSpecializationInfo() const {
4226 return TemplateOrSpecialization
4227 .dyn_cast<DependentFunctionTemplateSpecializationInfo *>();
4228}
4229
4230DependentFunctionTemplateSpecializationInfo *
4231DependentFunctionTemplateSpecializationInfo::Create(
4232 ASTContext &Context, const UnresolvedSetImpl &Candidates,
4233 const TemplateArgumentListInfo *TArgs) {
4234 const auto *TArgsWritten =
4235 TArgs ? ASTTemplateArgumentListInfo::Create(C: Context, List: *TArgs) : nullptr;
4236 return new (Context.Allocate(
4237 Size: totalSizeToAlloc<FunctionTemplateDecl *>(Counts: Candidates.size())))
4238 DependentFunctionTemplateSpecializationInfo(Candidates, TArgsWritten);
4239}
4240
4241DependentFunctionTemplateSpecializationInfo::
4242 DependentFunctionTemplateSpecializationInfo(
4243 const UnresolvedSetImpl &Candidates,
4244 const ASTTemplateArgumentListInfo *TemplateArgsWritten)
4245 : NumCandidates(Candidates.size()),
4246 TemplateArgumentsAsWritten(TemplateArgsWritten) {
4247 std::transform(first: Candidates.begin(), last: Candidates.end(),
4248 result: getTrailingObjects<FunctionTemplateDecl *>(),
4249 unary_op: [](NamedDecl *ND) {
4250 return cast<FunctionTemplateDecl>(Val: ND->getUnderlyingDecl());
4251 });
4252}
4253
4254TemplateSpecializationKind FunctionDecl::getTemplateSpecializationKind() const {
4255 // For a function template specialization, query the specialization
4256 // information object.
4257 if (FunctionTemplateSpecializationInfo *FTSInfo =
4258 TemplateOrSpecialization
4259 .dyn_cast<FunctionTemplateSpecializationInfo *>())
4260 return FTSInfo->getTemplateSpecializationKind();
4261
4262 if (MemberSpecializationInfo *MSInfo =
4263 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
4264 return MSInfo->getTemplateSpecializationKind();
4265
4266 // A dependent function template specialization is an explicit specialization,
4267 // except when it's a friend declaration.
4268 if (TemplateOrSpecialization
4269 .is<DependentFunctionTemplateSpecializationInfo *>() &&
4270 getFriendObjectKind() == FOK_None)
4271 return TSK_ExplicitSpecialization;
4272
4273 return TSK_Undeclared;
4274}
4275
4276TemplateSpecializationKind
4277FunctionDecl::getTemplateSpecializationKindForInstantiation() const {
4278 // This is the same as getTemplateSpecializationKind(), except that for a
4279 // function that is both a function template specialization and a member
4280 // specialization, we prefer the member specialization information. Eg:
4281 //
4282 // template<typename T> struct A {
4283 // template<typename U> void f() {}
4284 // template<> void f<int>() {}
4285 // };
4286 //
4287 // Within the templated CXXRecordDecl, A<T>::f<int> is a dependent function
4288 // template specialization; both getTemplateSpecializationKind() and
4289 // getTemplateSpecializationKindForInstantiation() will return
4290 // TSK_ExplicitSpecialization.
4291 //
4292 // For A<int>::f<int>():
4293 // * getTemplateSpecializationKind() will return TSK_ExplicitSpecialization
4294 // * getTemplateSpecializationKindForInstantiation() will return
4295 // TSK_ImplicitInstantiation
4296 //
4297 // This reflects the facts that A<int>::f<int> is an explicit specialization
4298 // of A<int>::f, and that A<int>::f<int> should be implicitly instantiated
4299 // from A::f<int> if a definition is needed.
4300 if (FunctionTemplateSpecializationInfo *FTSInfo =
4301 TemplateOrSpecialization
4302 .dyn_cast<FunctionTemplateSpecializationInfo *>()) {
4303 if (auto *MSInfo = FTSInfo->getMemberSpecializationInfo())
4304 return MSInfo->getTemplateSpecializationKind();
4305 return FTSInfo->getTemplateSpecializationKind();
4306 }
4307
4308 if (MemberSpecializationInfo *MSInfo =
4309 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
4310 return MSInfo->getTemplateSpecializationKind();
4311
4312 if (TemplateOrSpecialization
4313 .is<DependentFunctionTemplateSpecializationInfo *>() &&
4314 getFriendObjectKind() == FOK_None)
4315 return TSK_ExplicitSpecialization;
4316
4317 return TSK_Undeclared;
4318}
4319
4320void
4321FunctionDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
4322 SourceLocation PointOfInstantiation) {
4323 if (FunctionTemplateSpecializationInfo *FTSInfo
4324 = TemplateOrSpecialization.dyn_cast<
4325 FunctionTemplateSpecializationInfo*>()) {
4326 FTSInfo->setTemplateSpecializationKind(TSK);
4327 if (TSK != TSK_ExplicitSpecialization &&
4328 PointOfInstantiation.isValid() &&
4329 FTSInfo->getPointOfInstantiation().isInvalid()) {
4330 FTSInfo->setPointOfInstantiation(PointOfInstantiation);
4331 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
4332 L->InstantiationRequested(D: this);
4333 }
4334 } else if (MemberSpecializationInfo *MSInfo
4335 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>()) {
4336 MSInfo->setTemplateSpecializationKind(TSK);
4337 if (TSK != TSK_ExplicitSpecialization &&
4338 PointOfInstantiation.isValid() &&
4339 MSInfo->getPointOfInstantiation().isInvalid()) {
4340 MSInfo->setPointOfInstantiation(PointOfInstantiation);
4341 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
4342 L->InstantiationRequested(D: this);
4343 }
4344 } else
4345 llvm_unreachable("Function cannot have a template specialization kind");
4346}
4347
4348SourceLocation FunctionDecl::getPointOfInstantiation() const {
4349 if (FunctionTemplateSpecializationInfo *FTSInfo
4350 = TemplateOrSpecialization.dyn_cast<
4351 FunctionTemplateSpecializationInfo*>())
4352 return FTSInfo->getPointOfInstantiation();
4353 if (MemberSpecializationInfo *MSInfo =
4354 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
4355 return MSInfo->getPointOfInstantiation();
4356
4357 return SourceLocation();
4358}
4359
4360bool FunctionDecl::isOutOfLine() const {
4361 if (Decl::isOutOfLine())
4362 return true;
4363
4364 // If this function was instantiated from a member function of a
4365 // class template, check whether that member function was defined out-of-line.
4366 if (FunctionDecl *FD = getInstantiatedFromMemberFunction()) {
4367 const FunctionDecl *Definition;
4368 if (FD->hasBody(Definition))
4369 return Definition->isOutOfLine();
4370 }
4371
4372 // If this function was instantiated from a function template,
4373 // check whether that function template was defined out-of-line.
4374 if (FunctionTemplateDecl *FunTmpl = getPrimaryTemplate()) {
4375 const FunctionDecl *Definition;
4376 if (FunTmpl->getTemplatedDecl()->hasBody(Definition))
4377 return Definition->isOutOfLine();
4378 }
4379
4380 return false;
4381}
4382
4383SourceRange FunctionDecl::getSourceRange() const {
4384 return SourceRange(getOuterLocStart(), EndRangeLoc);
4385}
4386
4387unsigned FunctionDecl::getMemoryFunctionKind() const {
4388 IdentifierInfo *FnInfo = getIdentifier();
4389
4390 if (!FnInfo)
4391 return 0;
4392
4393 // Builtin handling.
4394 switch (getBuiltinID()) {
4395 case Builtin::BI__builtin_memset:
4396 case Builtin::BI__builtin___memset_chk:
4397 case Builtin::BImemset:
4398 return Builtin::BImemset;
4399
4400 case Builtin::BI__builtin_memcpy:
4401 case Builtin::BI__builtin___memcpy_chk:
4402 case Builtin::BImemcpy:
4403 return Builtin::BImemcpy;
4404
4405 case Builtin::BI__builtin_mempcpy:
4406 case Builtin::BI__builtin___mempcpy_chk:
4407 case Builtin::BImempcpy:
4408 return Builtin::BImempcpy;
4409
4410 case Builtin::BI__builtin_memmove:
4411 case Builtin::BI__builtin___memmove_chk:
4412 case Builtin::BImemmove:
4413 return Builtin::BImemmove;
4414
4415 case Builtin::BIstrlcpy:
4416 case Builtin::BI__builtin___strlcpy_chk:
4417 return Builtin::BIstrlcpy;
4418
4419 case Builtin::BIstrlcat:
4420 case Builtin::BI__builtin___strlcat_chk:
4421 return Builtin::BIstrlcat;
4422
4423 case Builtin::BI__builtin_memcmp:
4424 case Builtin::BImemcmp:
4425 return Builtin::BImemcmp;
4426
4427 case Builtin::BI__builtin_bcmp:
4428 case Builtin::BIbcmp:
4429 return Builtin::BIbcmp;
4430
4431 case Builtin::BI__builtin_strncpy:
4432 case Builtin::BI__builtin___strncpy_chk:
4433 case Builtin::BIstrncpy:
4434 return Builtin::BIstrncpy;
4435
4436 case Builtin::BI__builtin_strncmp:
4437 case Builtin::BIstrncmp:
4438 return Builtin::BIstrncmp;
4439
4440 case Builtin::BI__builtin_strncasecmp:
4441 case Builtin::BIstrncasecmp:
4442 return Builtin::BIstrncasecmp;
4443
4444 case Builtin::BI__builtin_strncat:
4445 case Builtin::BI__builtin___strncat_chk:
4446 case Builtin::BIstrncat:
4447 return Builtin::BIstrncat;
4448
4449 case Builtin::BI__builtin_strndup:
4450 case Builtin::BIstrndup:
4451 return Builtin::BIstrndup;
4452
4453 case Builtin::BI__builtin_strlen:
4454 case Builtin::BIstrlen:
4455 return Builtin::BIstrlen;
4456
4457 case Builtin::BI__builtin_bzero:
4458 case Builtin::BIbzero:
4459 return Builtin::BIbzero;
4460
4461 case Builtin::BI__builtin_bcopy:
4462 case Builtin::BIbcopy:
4463 return Builtin::BIbcopy;
4464
4465 case Builtin::BIfree:
4466 return Builtin::BIfree;
4467
4468 default:
4469 if (isExternC()) {
4470 if (FnInfo->isStr(Str: "memset"))
4471 return Builtin::BImemset;
4472 if (FnInfo->isStr(Str: "memcpy"))
4473 return Builtin::BImemcpy;
4474 if (FnInfo->isStr(Str: "mempcpy"))
4475 return Builtin::BImempcpy;
4476 if (FnInfo->isStr(Str: "memmove"))
4477 return Builtin::BImemmove;
4478 if (FnInfo->isStr(Str: "memcmp"))
4479 return Builtin::BImemcmp;
4480 if (FnInfo->isStr(Str: "bcmp"))
4481 return Builtin::BIbcmp;
4482 if (FnInfo->isStr(Str: "strncpy"))
4483 return Builtin::BIstrncpy;
4484 if (FnInfo->isStr(Str: "strncmp"))
4485 return Builtin::BIstrncmp;
4486 if (FnInfo->isStr(Str: "strncasecmp"))
4487 return Builtin::BIstrncasecmp;
4488 if (FnInfo->isStr(Str: "strncat"))
4489 return Builtin::BIstrncat;
4490 if (FnInfo->isStr(Str: "strndup"))
4491 return Builtin::BIstrndup;
4492 if (FnInfo->isStr(Str: "strlen"))
4493 return Builtin::BIstrlen;
4494 if (FnInfo->isStr(Str: "bzero"))
4495 return Builtin::BIbzero;
4496 if (FnInfo->isStr(Str: "bcopy"))
4497 return Builtin::BIbcopy;
4498 } else if (isInStdNamespace()) {
4499 if (FnInfo->isStr(Str: "free"))
4500 return Builtin::BIfree;
4501 }
4502 break;
4503 }
4504 return 0;
4505}
4506
4507unsigned FunctionDecl::getODRHash() const {
4508 assert(hasODRHash());
4509 return ODRHash;
4510}
4511
4512unsigned FunctionDecl::getODRHash() {
4513 if (hasODRHash())
4514 return ODRHash;
4515
4516 if (auto *FT = getInstantiatedFromMemberFunction()) {
4517 setHasODRHash(true);
4518 ODRHash = FT->getODRHash();
4519 return ODRHash;
4520 }
4521
4522 class ODRHash Hash;
4523 Hash.AddFunctionDecl(Function: this);
4524 setHasODRHash(true);
4525 ODRHash = Hash.CalculateHash();
4526 return ODRHash;
4527}
4528
4529//===----------------------------------------------------------------------===//
4530// FieldDecl Implementation
4531//===----------------------------------------------------------------------===//
4532
4533FieldDecl *FieldDecl::Create(const ASTContext &C, DeclContext *DC,
4534 SourceLocation StartLoc, SourceLocation IdLoc,
4535 const IdentifierInfo *Id, QualType T,
4536 TypeSourceInfo *TInfo, Expr *BW, bool Mutable,
4537 InClassInitStyle InitStyle) {
4538 return new (C, DC) FieldDecl(Decl::Field, DC, StartLoc, IdLoc, Id, T, TInfo,
4539 BW, Mutable, InitStyle);
4540}
4541
4542FieldDecl *FieldDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID) {
4543 return new (C, ID) FieldDecl(Field, nullptr, SourceLocation(),
4544 SourceLocation(), nullptr, QualType(), nullptr,
4545 nullptr, false, ICIS_NoInit);
4546}
4547
4548bool FieldDecl::isAnonymousStructOrUnion() const {
4549 if (!isImplicit() || getDeclName())
4550 return false;
4551
4552 if (const auto *Record = getType()->getAs<RecordType>())
4553 return Record->getDecl()->isAnonymousStructOrUnion();
4554
4555 return false;
4556}
4557
4558Expr *FieldDecl::getInClassInitializer() const {
4559 if (!hasInClassInitializer())
4560 return nullptr;
4561
4562 LazyDeclStmtPtr InitPtr = BitField ? InitAndBitWidth->Init : Init;
4563 return cast_if_present<Expr>(
4564 Val: InitPtr.isOffset() ? InitPtr.get(Source: getASTContext().getExternalSource())
4565 : InitPtr.get(Source: nullptr));
4566}
4567
4568void FieldDecl::setInClassInitializer(Expr *NewInit) {
4569 setLazyInClassInitializer(LazyDeclStmtPtr(NewInit));
4570}
4571
4572void FieldDecl::setLazyInClassInitializer(LazyDeclStmtPtr NewInit) {
4573 assert(hasInClassInitializer() && !getInClassInitializer());
4574 if (BitField)
4575 InitAndBitWidth->Init = NewInit;
4576 else
4577 Init = NewInit;
4578}
4579
4580unsigned FieldDecl::getBitWidthValue(const ASTContext &Ctx) const {
4581 assert(isBitField() && "not a bitfield");
4582 return getBitWidth()->EvaluateKnownConstInt(Ctx).getZExtValue();
4583}
4584
4585bool FieldDecl::isZeroLengthBitField(const ASTContext &Ctx) const {
4586 return isUnnamedBitField() && !getBitWidth()->isValueDependent() &&
4587 getBitWidthValue(Ctx) == 0;
4588}
4589
4590bool FieldDecl::isZeroSize(const ASTContext &Ctx) const {
4591 if (isZeroLengthBitField(Ctx))
4592 return true;
4593
4594 // C++2a [intro.object]p7:
4595 // An object has nonzero size if it
4596 // -- is not a potentially-overlapping subobject, or
4597 if (!hasAttr<NoUniqueAddressAttr>())
4598 return false;
4599
4600 // -- is not of class type, or
4601 const auto *RT = getType()->getAs<RecordType>();
4602 if (!RT)
4603 return false;
4604 const RecordDecl *RD = RT->getDecl()->getDefinition();
4605 if (!RD) {
4606 assert(isInvalidDecl() && "valid field has incomplete type");
4607 return false;
4608 }
4609
4610 // -- [has] virtual member functions or virtual base classes, or
4611 // -- has subobjects of nonzero size or bit-fields of nonzero length
4612 const auto *CXXRD = cast<CXXRecordDecl>(Val: RD);
4613 if (!CXXRD->isEmpty())
4614 return false;
4615
4616 // Otherwise, [...] the circumstances under which the object has zero size
4617 // are implementation-defined.
4618 if (!Ctx.getTargetInfo().getCXXABI().isMicrosoft())
4619 return true;
4620
4621 // MS ABI: has nonzero size if it is a class type with class type fields,
4622 // whether or not they have nonzero size
4623 return !llvm::any_of(Range: CXXRD->fields(), P: [](const FieldDecl *Field) {
4624 return Field->getType()->getAs<RecordType>();
4625 });
4626}
4627
4628bool FieldDecl::isPotentiallyOverlapping() const {
4629 return hasAttr<NoUniqueAddressAttr>() && getType()->getAsCXXRecordDecl();
4630}
4631
4632unsigned FieldDecl::getFieldIndex() const {
4633 const FieldDecl *Canonical = getCanonicalDecl();
4634 if (Canonical != this)
4635 return Canonical->getFieldIndex();
4636
4637 if (CachedFieldIndex) return CachedFieldIndex - 1;
4638
4639 unsigned Index = 0;
4640 const RecordDecl *RD = getParent()->getDefinition();
4641 assert(RD && "requested index for field of struct with no definition");
4642
4643 for (auto *Field : RD->fields()) {
4644 Field->getCanonicalDecl()->CachedFieldIndex = Index + 1;
4645 assert(Field->getCanonicalDecl()->CachedFieldIndex == Index + 1 &&
4646 "overflow in field numbering");
4647 ++Index;
4648 }
4649
4650 assert(CachedFieldIndex && "failed to find field in parent");
4651 return CachedFieldIndex - 1;
4652}
4653
4654SourceRange FieldDecl::getSourceRange() const {
4655 const Expr *FinalExpr = getInClassInitializer();
4656 if (!FinalExpr)
4657 FinalExpr = getBitWidth();
4658 if (FinalExpr)
4659 return SourceRange(getInnerLocStart(), FinalExpr->getEndLoc());
4660 return DeclaratorDecl::getSourceRange();
4661}
4662
4663void FieldDecl::setCapturedVLAType(const VariableArrayType *VLAType) {
4664 assert((getParent()->isLambda() || getParent()->isCapturedRecord()) &&
4665 "capturing type in non-lambda or captured record.");
4666 assert(StorageKind == ISK_NoInit && !BitField &&
4667 "bit-field or field with default member initializer cannot capture "
4668 "VLA type");
4669 StorageKind = ISK_CapturedVLAType;
4670 CapturedVLAType = VLAType;
4671}
4672
4673void FieldDecl::printName(raw_ostream &OS, const PrintingPolicy &Policy) const {
4674 // Print unnamed members using name of their type.
4675 if (isAnonymousStructOrUnion()) {
4676 this->getType().print(OS, Policy);
4677 return;
4678 }
4679 // Otherwise, do the normal printing.
4680 DeclaratorDecl::printName(OS, Policy);
4681}
4682
4683//===----------------------------------------------------------------------===//
4684// TagDecl Implementation
4685//===----------------------------------------------------------------------===//
4686
4687TagDecl::TagDecl(Kind DK, TagKind TK, const ASTContext &C, DeclContext *DC,
4688 SourceLocation L, IdentifierInfo *Id, TagDecl *PrevDecl,
4689 SourceLocation StartL)
4690 : TypeDecl(DK, DC, L, Id, StartL), DeclContext(DK), redeclarable_base(C),
4691 TypedefNameDeclOrQualifier((TypedefNameDecl *)nullptr) {
4692 assert((DK != Enum || TK == TagTypeKind::Enum) &&
4693 "EnumDecl not matched with TagTypeKind::Enum");
4694 setPreviousDecl(PrevDecl);
4695 setTagKind(TK);
4696 setCompleteDefinition(false);
4697 setBeingDefined(false);
4698 setEmbeddedInDeclarator(false);
4699 setFreeStanding(false);
4700 setCompleteDefinitionRequired(false);
4701 TagDeclBits.IsThisDeclarationADemotedDefinition = false;
4702}
4703
4704SourceLocation TagDecl::getOuterLocStart() const {
4705 return getTemplateOrInnerLocStart(decl: this);
4706}
4707
4708SourceRange TagDecl::getSourceRange() const {
4709 SourceLocation RBraceLoc = BraceRange.getEnd();
4710 SourceLocation E = RBraceLoc.isValid() ? RBraceLoc : getLocation();
4711 return SourceRange(getOuterLocStart(), E);
4712}
4713
4714TagDecl *TagDecl::getCanonicalDecl() { return getFirstDecl(); }
4715
4716void TagDecl::setTypedefNameForAnonDecl(TypedefNameDecl *TDD) {
4717 TypedefNameDeclOrQualifier = TDD;
4718 if (const Type *T = getTypeForDecl()) {
4719 (void)T;
4720 assert(T->isLinkageValid());
4721 }
4722 assert(isLinkageValid());
4723}
4724
4725void TagDecl::startDefinition() {
4726 setBeingDefined(true);
4727
4728 if (auto *D = dyn_cast<CXXRecordDecl>(Val: this)) {
4729 struct CXXRecordDecl::DefinitionData *Data =
4730 new (getASTContext()) struct CXXRecordDecl::DefinitionData(D);
4731 for (auto *I : redecls())
4732 cast<CXXRecordDecl>(Val: I)->DefinitionData = Data;
4733 }
4734}
4735
4736void TagDecl::completeDefinition() {
4737 assert((!isa<CXXRecordDecl>(this) ||
4738 cast<CXXRecordDecl>(this)->hasDefinition()) &&
4739 "definition completed but not started");
4740
4741 setCompleteDefinition(true);
4742 setBeingDefined(false);
4743
4744 if (ASTMutationListener *L = getASTMutationListener())
4745 L->CompletedTagDefinition(D: this);
4746}
4747
4748TagDecl *TagDecl::getDefinition() const {
4749 if (isCompleteDefinition())
4750 return const_cast<TagDecl *>(this);
4751
4752 // If it's possible for us to have an out-of-date definition, check now.
4753 if (mayHaveOutOfDateDef()) {
4754 if (IdentifierInfo *II = getIdentifier()) {
4755 if (II->isOutOfDate()) {
4756 updateOutOfDate(II&: *II);
4757 }
4758 }
4759 }
4760
4761 if (const auto *CXXRD = dyn_cast<CXXRecordDecl>(Val: this))
4762 return CXXRD->getDefinition();
4763
4764 for (auto *R : redecls())
4765 if (R->isCompleteDefinition())
4766 return R;
4767
4768 return nullptr;
4769}
4770
4771void TagDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) {
4772 if (QualifierLoc) {
4773 // Make sure the extended qualifier info is allocated.
4774 if (!hasExtInfo())
4775 TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo;
4776 // Set qualifier info.
4777 getExtInfo()->QualifierLoc = QualifierLoc;
4778 } else {
4779 // Here Qualifier == 0, i.e., we are removing the qualifier (if any).
4780 if (hasExtInfo()) {
4781 if (getExtInfo()->NumTemplParamLists == 0) {
4782 getASTContext().Deallocate(Ptr: getExtInfo());
4783 TypedefNameDeclOrQualifier = (TypedefNameDecl *)nullptr;
4784 }
4785 else
4786 getExtInfo()->QualifierLoc = QualifierLoc;
4787 }
4788 }
4789}
4790
4791void TagDecl::printName(raw_ostream &OS, const PrintingPolicy &Policy) const {
4792 DeclarationName Name = getDeclName();
4793 // If the name is supposed to have an identifier but does not have one, then
4794 // the tag is anonymous and we should print it differently.
4795 if (Name.isIdentifier() && !Name.getAsIdentifierInfo()) {
4796 // If the caller wanted to print a qualified name, they've already printed
4797 // the scope. And if the caller doesn't want that, the scope information
4798 // is already printed as part of the type.
4799 PrintingPolicy Copy(Policy);
4800 Copy.SuppressScope = true;
4801 getASTContext().getTagDeclType(Decl: this).print(OS, Policy: Copy);
4802 return;
4803 }
4804 // Otherwise, do the normal printing.
4805 Name.print(OS, Policy);
4806}
4807
4808void TagDecl::setTemplateParameterListsInfo(
4809 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
4810 assert(!TPLists.empty());
4811 // Make sure the extended decl info is allocated.
4812 if (!hasExtInfo())
4813 // Allocate external info struct.
4814 TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo;
4815 // Set the template parameter lists info.
4816 getExtInfo()->setTemplateParameterListsInfo(Context, TPLists);
4817}
4818
4819//===----------------------------------------------------------------------===//
4820// EnumDecl Implementation
4821//===----------------------------------------------------------------------===//
4822
4823EnumDecl::EnumDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
4824 SourceLocation IdLoc, IdentifierInfo *Id, EnumDecl *PrevDecl,
4825 bool Scoped, bool ScopedUsingClassTag, bool Fixed)
4826 : TagDecl(Enum, TagTypeKind::Enum, C, DC, IdLoc, Id, PrevDecl, StartLoc) {
4827 assert(Scoped || !ScopedUsingClassTag);
4828 IntegerType = nullptr;
4829 setNumPositiveBits(0);
4830 setNumNegativeBits(0);
4831 setScoped(Scoped);
4832 setScopedUsingClassTag(ScopedUsingClassTag);
4833 setFixed(Fixed);
4834 setHasODRHash(false);
4835 ODRHash = 0;
4836}
4837
4838void EnumDecl::anchor() {}
4839
4840EnumDecl *EnumDecl::Create(ASTContext &C, DeclContext *DC,
4841 SourceLocation StartLoc, SourceLocation IdLoc,
4842 IdentifierInfo *Id,
4843 EnumDecl *PrevDecl, bool IsScoped,
4844 bool IsScopedUsingClassTag, bool IsFixed) {
4845 auto *Enum = new (C, DC) EnumDecl(C, DC, StartLoc, IdLoc, Id, PrevDecl,
4846 IsScoped, IsScopedUsingClassTag, IsFixed);
4847 Enum->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4848 C.getTypeDeclType(Decl: Enum, PrevDecl);
4849 return Enum;
4850}
4851
4852EnumDecl *EnumDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID) {
4853 EnumDecl *Enum =
4854 new (C, ID) EnumDecl(C, nullptr, SourceLocation(), SourceLocation(),
4855 nullptr, nullptr, false, false, false);
4856 Enum->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4857 return Enum;
4858}
4859
4860SourceRange EnumDecl::getIntegerTypeRange() const {
4861 if (const TypeSourceInfo *TI = getIntegerTypeSourceInfo())
4862 return TI->getTypeLoc().getSourceRange();
4863 return SourceRange();
4864}
4865
4866void EnumDecl::completeDefinition(QualType NewType,
4867 QualType NewPromotionType,
4868 unsigned NumPositiveBits,
4869 unsigned NumNegativeBits) {
4870 assert(!isCompleteDefinition() && "Cannot redefine enums!");
4871 if (!IntegerType)
4872 IntegerType = NewType.getTypePtr();
4873 PromotionType = NewPromotionType;
4874 setNumPositiveBits(NumPositiveBits);
4875 setNumNegativeBits(NumNegativeBits);
4876 TagDecl::completeDefinition();
4877}
4878
4879bool EnumDecl::isClosed() const {
4880 if (const auto *A = getAttr<EnumExtensibilityAttr>())
4881 return A->getExtensibility() == EnumExtensibilityAttr::Closed;
4882 return true;
4883}
4884
4885bool EnumDecl::isClosedFlag() const {
4886 return isClosed() && hasAttr<FlagEnumAttr>();
4887}
4888
4889bool EnumDecl::isClosedNonFlag() const {
4890 return isClosed() && !hasAttr<FlagEnumAttr>();
4891}
4892
4893TemplateSpecializationKind EnumDecl::getTemplateSpecializationKind() const {
4894 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
4895 return MSI->getTemplateSpecializationKind();
4896
4897 return TSK_Undeclared;
4898}
4899
4900void EnumDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
4901 SourceLocation PointOfInstantiation) {
4902 MemberSpecializationInfo *MSI = getMemberSpecializationInfo();
4903 assert(MSI && "Not an instantiated member enumeration?");
4904 MSI->setTemplateSpecializationKind(TSK);
4905 if (TSK != TSK_ExplicitSpecialization &&
4906 PointOfInstantiation.isValid() &&
4907 MSI->getPointOfInstantiation().isInvalid())
4908 MSI->setPointOfInstantiation(PointOfInstantiation);
4909}
4910
4911EnumDecl *EnumDecl::getTemplateInstantiationPattern() const {
4912 if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo()) {
4913 if (isTemplateInstantiation(Kind: MSInfo->getTemplateSpecializationKind())) {
4914 EnumDecl *ED = getInstantiatedFromMemberEnum();
4915 while (auto *NewED = ED->getInstantiatedFromMemberEnum())
4916 ED = NewED;
4917 return getDefinitionOrSelf(D: ED);
4918 }
4919 }
4920
4921 assert(!isTemplateInstantiation(getTemplateSpecializationKind()) &&
4922 "couldn't find pattern for enum instantiation");
4923 return nullptr;
4924}
4925
4926EnumDecl *EnumDecl::getInstantiatedFromMemberEnum() const {
4927 if (SpecializationInfo)
4928 return cast<EnumDecl>(Val: SpecializationInfo->getInstantiatedFrom());
4929
4930 return nullptr;
4931}
4932
4933void EnumDecl::setInstantiationOfMemberEnum(ASTContext &C, EnumDecl *ED,
4934 TemplateSpecializationKind TSK) {
4935 assert(!SpecializationInfo && "Member enum is already a specialization");
4936 SpecializationInfo = new (C) MemberSpecializationInfo(ED, TSK);
4937}
4938
4939unsigned EnumDecl::getODRHash() {
4940 if (hasODRHash())
4941 return ODRHash;
4942
4943 class ODRHash Hash;
4944 Hash.AddEnumDecl(Enum: this);
4945 setHasODRHash(true);
4946 ODRHash = Hash.CalculateHash();
4947 return ODRHash;
4948}
4949
4950SourceRange EnumDecl::getSourceRange() const {
4951 auto Res = TagDecl::getSourceRange();
4952 // Set end-point to enum-base, e.g. enum foo : ^bar
4953 if (auto *TSI = getIntegerTypeSourceInfo()) {
4954 // TagDecl doesn't know about the enum base.
4955 if (!getBraceRange().getEnd().isValid())
4956 Res.setEnd(TSI->getTypeLoc().getEndLoc());
4957 }
4958 return Res;
4959}
4960
4961void EnumDecl::getValueRange(llvm::APInt &Max, llvm::APInt &Min) const {
4962 unsigned Bitwidth = getASTContext().getIntWidth(T: getIntegerType());
4963 unsigned NumNegativeBits = getNumNegativeBits();
4964 unsigned NumPositiveBits = getNumPositiveBits();
4965
4966 if (NumNegativeBits) {
4967 unsigned NumBits = std::max(a: NumNegativeBits, b: NumPositiveBits + 1);
4968 Max = llvm::APInt(Bitwidth, 1) << (NumBits - 1);
4969 Min = -Max;
4970 } else {
4971 Max = llvm::APInt(Bitwidth, 1) << NumPositiveBits;
4972 Min = llvm::APInt::getZero(numBits: Bitwidth);
4973 }
4974}
4975
4976//===----------------------------------------------------------------------===//
4977// RecordDecl Implementation
4978//===----------------------------------------------------------------------===//
4979
4980RecordDecl::RecordDecl(Kind DK, TagKind TK, const ASTContext &C,
4981 DeclContext *DC, SourceLocation StartLoc,
4982 SourceLocation IdLoc, IdentifierInfo *Id,
4983 RecordDecl *PrevDecl)
4984 : TagDecl(DK, TK, C, DC, IdLoc, Id, PrevDecl, StartLoc) {
4985 assert(classof(static_cast<Decl *>(this)) && "Invalid Kind!");
4986 setHasFlexibleArrayMember(false);
4987 setAnonymousStructOrUnion(false);
4988 setHasObjectMember(false);
4989 setHasVolatileMember(false);
4990 setHasLoadedFieldsFromExternalStorage(false);
4991 setNonTrivialToPrimitiveDefaultInitialize(false);
4992 setNonTrivialToPrimitiveCopy(false);
4993 setNonTrivialToPrimitiveDestroy(false);
4994 setHasNonTrivialToPrimitiveDefaultInitializeCUnion(false);
4995 setHasNonTrivialToPrimitiveDestructCUnion(false);
4996 setHasNonTrivialToPrimitiveCopyCUnion(false);
4997 setParamDestroyedInCallee(false);
4998 setArgPassingRestrictions(RecordArgPassingKind::CanPassInRegs);
4999 setIsRandomized(false);
5000 setODRHash(0);
5001}
5002
5003RecordDecl *RecordDecl::Create(const ASTContext &C, TagKind TK, DeclContext *DC,
5004 SourceLocation StartLoc, SourceLocation IdLoc,
5005 IdentifierInfo *Id, RecordDecl* PrevDecl) {
5006 RecordDecl *R = new (C, DC) RecordDecl(Record, TK, C, DC,
5007 StartLoc, IdLoc, Id, PrevDecl);
5008 R->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
5009
5010 C.getTypeDeclType(Decl: R, PrevDecl);
5011 return R;
5012}
5013
5014RecordDecl *RecordDecl::CreateDeserialized(const ASTContext &C,
5015 GlobalDeclID ID) {
5016 RecordDecl *R = new (C, ID)
5017 RecordDecl(Record, TagTypeKind::Struct, C, nullptr, SourceLocation(),
5018 SourceLocation(), nullptr, nullptr);
5019 R->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
5020 return R;
5021}
5022
5023bool RecordDecl::isInjectedClassName() const {
5024 return isImplicit() && getDeclName() && getDeclContext()->isRecord() &&
5025 cast<RecordDecl>(Val: getDeclContext())->getDeclName() == getDeclName();
5026}
5027
5028bool RecordDecl::isLambda() const {
5029 if (auto RD = dyn_cast<CXXRecordDecl>(Val: this))
5030 return RD->isLambda();
5031 return false;
5032}
5033
5034bool RecordDecl::isCapturedRecord() const {
5035 return hasAttr<CapturedRecordAttr>();
5036}
5037
5038void RecordDecl::setCapturedRecord() {
5039 addAttr(A: CapturedRecordAttr::CreateImplicit(Ctx&: getASTContext()));
5040}
5041
5042bool RecordDecl::isOrContainsUnion() const {
5043 if (isUnion())
5044 return true;
5045
5046 if (const RecordDecl *Def = getDefinition()) {
5047 for (const FieldDecl *FD : Def->fields()) {
5048 const RecordType *RT = FD->getType()->getAs<RecordType>();
5049 if (RT && RT->getDecl()->isOrContainsUnion())
5050 return true;
5051 }
5052 }
5053
5054 return false;
5055}
5056
5057RecordDecl::field_iterator RecordDecl::field_begin() const {
5058 if (hasExternalLexicalStorage() && !hasLoadedFieldsFromExternalStorage())
5059 LoadFieldsFromExternalStorage();
5060 // This is necessary for correctness for C++ with modules.
5061 // FIXME: Come up with a test case that breaks without definition.
5062 if (RecordDecl *D = getDefinition(); D && D != this)
5063 return D->field_begin();
5064 return field_iterator(decl_iterator(FirstDecl));
5065}
5066
5067/// completeDefinition - Notes that the definition of this type is now
5068/// complete.
5069void RecordDecl::completeDefinition() {
5070 assert(!isCompleteDefinition() && "Cannot redefine record!");
5071 TagDecl::completeDefinition();
5072
5073 ASTContext &Ctx = getASTContext();
5074
5075 // Layouts are dumped when computed, so if we are dumping for all complete
5076 // types, we need to force usage to get types that wouldn't be used elsewhere.
5077 //
5078 // If the type is dependent, then we can't compute its layout because there
5079 // is no way for us to know the size or alignment of a dependent type. Also
5080 // ignore declarations marked as invalid since 'getASTRecordLayout()' asserts
5081 // on that.
5082 if (Ctx.getLangOpts().DumpRecordLayoutsComplete && !isDependentType() &&
5083 !isInvalidDecl())
5084 (void)Ctx.getASTRecordLayout(D: this);
5085}
5086
5087/// isMsStruct - Get whether or not this record uses ms_struct layout.
5088/// This which can be turned on with an attribute, pragma, or the
5089/// -mms-bitfields command-line option.
5090bool RecordDecl::isMsStruct(const ASTContext &C) const {
5091 return hasAttr<MSStructAttr>() || C.getLangOpts().MSBitfields == 1;
5092}
5093
5094void RecordDecl::reorderDecls(const SmallVectorImpl<Decl *> &Decls) {
5095 std::tie(args&: FirstDecl, args&: LastDecl) = DeclContext::BuildDeclChain(Decls, FieldsAlreadyLoaded: false);
5096 LastDecl->NextInContextAndBits.setPointer(nullptr);
5097 setIsRandomized(true);
5098}
5099
5100void RecordDecl::LoadFieldsFromExternalStorage() const {
5101 ExternalASTSource *Source = getASTContext().getExternalSource();
5102 assert(hasExternalLexicalStorage() && Source && "No external storage?");
5103
5104 // Notify that we have a RecordDecl doing some initialization.
5105 ExternalASTSource::Deserializing TheFields(Source);
5106
5107 SmallVector<Decl*, 64> Decls;
5108 setHasLoadedFieldsFromExternalStorage(true);
5109 Source->FindExternalLexicalDecls(DC: this, IsKindWeWant: [](Decl::Kind K) {
5110 return FieldDecl::classofKind(K) || IndirectFieldDecl::classofKind(K);
5111 }, Result&: Decls);
5112
5113#ifndef NDEBUG
5114 // Check that all decls we got were FieldDecls.
5115 for (unsigned i=0, e=Decls.size(); i != e; ++i)
5116 assert(isa<FieldDecl>(Decls[i]) || isa<IndirectFieldDecl>(Decls[i]));
5117#endif
5118
5119 if (Decls.empty())
5120 return;
5121
5122 auto [ExternalFirst, ExternalLast] =
5123 BuildDeclChain(Decls,
5124 /*FieldsAlreadyLoaded=*/false);
5125 ExternalLast->NextInContextAndBits.setPointer(FirstDecl);
5126 FirstDecl = ExternalFirst;
5127 if (!LastDecl)
5128 LastDecl = ExternalLast;
5129}
5130
5131bool RecordDecl::mayInsertExtraPadding(bool EmitRemark) const {
5132 ASTContext &Context = getASTContext();
5133 const SanitizerMask EnabledAsanMask = Context.getLangOpts().Sanitize.Mask &
5134 (SanitizerKind::Address | SanitizerKind::KernelAddress);
5135 if (!EnabledAsanMask || !Context.getLangOpts().SanitizeAddressFieldPadding)
5136 return false;
5137 const auto &NoSanitizeList = Context.getNoSanitizeList();
5138 const auto *CXXRD = dyn_cast<CXXRecordDecl>(Val: this);
5139 // We may be able to relax some of these requirements.
5140 int ReasonToReject = -1;
5141 if (!CXXRD || CXXRD->isExternCContext())
5142 ReasonToReject = 0; // is not C++.
5143 else if (CXXRD->hasAttr<PackedAttr>())
5144 ReasonToReject = 1; // is packed.
5145 else if (CXXRD->isUnion())
5146 ReasonToReject = 2; // is a union.
5147 else if (CXXRD->isTriviallyCopyable())
5148 ReasonToReject = 3; // is trivially copyable.
5149 else if (CXXRD->hasTrivialDestructor())
5150 ReasonToReject = 4; // has trivial destructor.
5151 else if (CXXRD->isStandardLayout())
5152 ReasonToReject = 5; // is standard layout.
5153 else if (NoSanitizeList.containsLocation(Mask: EnabledAsanMask, Loc: getLocation(),
5154 Category: "field-padding"))
5155 ReasonToReject = 6; // is in an excluded file.
5156 else if (NoSanitizeList.containsType(
5157 Mask: EnabledAsanMask, MangledTypeName: getQualifiedNameAsString(), Category: "field-padding"))
5158 ReasonToReject = 7; // The type is excluded.
5159
5160 if (EmitRemark) {
5161 if (ReasonToReject >= 0)
5162 Context.getDiagnostics().Report(
5163 Loc: getLocation(),
5164 DiagID: diag::remark_sanitize_address_insert_extra_padding_rejected)
5165 << getQualifiedNameAsString() << ReasonToReject;
5166 else
5167 Context.getDiagnostics().Report(
5168 Loc: getLocation(),
5169 DiagID: diag::remark_sanitize_address_insert_extra_padding_accepted)
5170 << getQualifiedNameAsString();
5171 }
5172 return ReasonToReject < 0;
5173}
5174
5175const FieldDecl *RecordDecl::findFirstNamedDataMember() const {
5176 for (const auto *I : fields()) {
5177 if (I->getIdentifier())
5178 return I;
5179
5180 if (const auto *RT = I->getType()->getAs<RecordType>())
5181 if (const FieldDecl *NamedDataMember =
5182 RT->getDecl()->findFirstNamedDataMember())
5183 return NamedDataMember;
5184 }
5185
5186 // We didn't find a named data member.
5187 return nullptr;
5188}
5189
5190unsigned RecordDecl::getODRHash() {
5191 if (hasODRHash())
5192 return RecordDeclBits.ODRHash;
5193
5194 // Only calculate hash on first call of getODRHash per record.
5195 ODRHash Hash;
5196 Hash.AddRecordDecl(Record: this);
5197 // For RecordDecl the ODRHash is stored in the remaining 26
5198 // bit of RecordDeclBits, adjust the hash to accomodate.
5199 setODRHash(Hash.CalculateHash() >> 6);
5200 return RecordDeclBits.ODRHash;
5201}
5202
5203//===----------------------------------------------------------------------===//
5204// BlockDecl Implementation
5205//===----------------------------------------------------------------------===//
5206
5207BlockDecl::BlockDecl(DeclContext *DC, SourceLocation CaretLoc)
5208 : Decl(Block, DC, CaretLoc), DeclContext(Block) {
5209 setIsVariadic(false);
5210 setCapturesCXXThis(false);
5211 setBlockMissingReturnType(true);
5212 setIsConversionFromLambda(false);
5213 setDoesNotEscape(false);
5214 setCanAvoidCopyToHeap(false);
5215}
5216
5217void BlockDecl::setParams(ArrayRef<ParmVarDecl *> NewParamInfo) {
5218 assert(!ParamInfo && "Already has param info!");
5219
5220 // Zero params -> null pointer.
5221 if (!NewParamInfo.empty()) {
5222 NumParams = NewParamInfo.size();
5223 ParamInfo = new (getASTContext()) ParmVarDecl*[NewParamInfo.size()];
5224 std::copy(NewParamInfo.begin(), NewParamInfo.end(), ParamInfo);
5225 }
5226}
5227
5228void BlockDecl::setCaptures(ASTContext &Context, ArrayRef<Capture> Captures,
5229 bool CapturesCXXThis) {
5230 this->setCapturesCXXThis(CapturesCXXThis);
5231 this->NumCaptures = Captures.size();
5232
5233 if (Captures.empty()) {
5234 this->Captures = nullptr;
5235 return;
5236 }
5237
5238 this->Captures = Captures.copy(A&: Context).data();
5239}
5240
5241bool BlockDecl::capturesVariable(const VarDecl *variable) const {
5242 for (const auto &I : captures())
5243 // Only auto vars can be captured, so no redeclaration worries.
5244 if (I.getVariable() == variable)
5245 return true;
5246
5247 return false;
5248}
5249
5250SourceRange BlockDecl::getSourceRange() const {
5251 return SourceRange(getLocation(), Body ? Body->getEndLoc() : getLocation());
5252}
5253
5254//===----------------------------------------------------------------------===//
5255// Other Decl Allocation/Deallocation Method Implementations
5256//===----------------------------------------------------------------------===//
5257
5258void TranslationUnitDecl::anchor() {}
5259
5260TranslationUnitDecl *TranslationUnitDecl::Create(ASTContext &C) {
5261 return new (C, (DeclContext *)nullptr) TranslationUnitDecl(C);
5262}
5263
5264void TranslationUnitDecl::setAnonymousNamespace(NamespaceDecl *D) {
5265 AnonymousNamespace = D;
5266
5267 if (ASTMutationListener *Listener = Ctx.getASTMutationListener())
5268 Listener->AddedAnonymousNamespace(TU: this, AnonNamespace: D);
5269}
5270
5271void PragmaCommentDecl::anchor() {}
5272
5273PragmaCommentDecl *PragmaCommentDecl::Create(const ASTContext &C,
5274 TranslationUnitDecl *DC,
5275 SourceLocation CommentLoc,
5276 PragmaMSCommentKind CommentKind,
5277 StringRef Arg) {
5278 PragmaCommentDecl *PCD =
5279 new (C, DC, additionalSizeToAlloc<char>(Counts: Arg.size() + 1))
5280 PragmaCommentDecl(DC, CommentLoc, CommentKind);
5281 memcpy(dest: PCD->getTrailingObjects<char>(), src: Arg.data(), n: Arg.size());
5282 PCD->getTrailingObjects<char>()[Arg.size()] = '\0';
5283 return PCD;
5284}
5285
5286PragmaCommentDecl *PragmaCommentDecl::CreateDeserialized(ASTContext &C,
5287 GlobalDeclID ID,
5288 unsigned ArgSize) {
5289 return new (C, ID, additionalSizeToAlloc<char>(Counts: ArgSize + 1))
5290 PragmaCommentDecl(nullptr, SourceLocation(), PCK_Unknown);
5291}
5292
5293void PragmaDetectMismatchDecl::anchor() {}
5294
5295PragmaDetectMismatchDecl *
5296PragmaDetectMismatchDecl::Create(const ASTContext &C, TranslationUnitDecl *DC,
5297 SourceLocation Loc, StringRef Name,
5298 StringRef Value) {
5299 size_t ValueStart = Name.size() + 1;
5300 PragmaDetectMismatchDecl *PDMD =
5301 new (C, DC, additionalSizeToAlloc<char>(Counts: ValueStart + Value.size() + 1))
5302 PragmaDetectMismatchDecl(DC, Loc, ValueStart);
5303 memcpy(dest: PDMD->getTrailingObjects<char>(), src: Name.data(), n: Name.size());
5304 PDMD->getTrailingObjects<char>()[Name.size()] = '\0';
5305 memcpy(dest: PDMD->getTrailingObjects<char>() + ValueStart, src: Value.data(),
5306 n: Value.size());
5307 PDMD->getTrailingObjects<char>()[ValueStart + Value.size()] = '\0';
5308 return PDMD;
5309}
5310
5311PragmaDetectMismatchDecl *
5312PragmaDetectMismatchDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID,
5313 unsigned NameValueSize) {
5314 return new (C, ID, additionalSizeToAlloc<char>(Counts: NameValueSize + 1))
5315 PragmaDetectMismatchDecl(nullptr, SourceLocation(), 0);
5316}
5317
5318void ExternCContextDecl::anchor() {}
5319
5320ExternCContextDecl *ExternCContextDecl::Create(const ASTContext &C,
5321 TranslationUnitDecl *DC) {
5322 return new (C, DC) ExternCContextDecl(DC);
5323}
5324
5325void LabelDecl::anchor() {}
5326
5327LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC,
5328 SourceLocation IdentL, IdentifierInfo *II) {
5329 return new (C, DC) LabelDecl(DC, IdentL, II, nullptr, IdentL);
5330}
5331
5332LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC,
5333 SourceLocation IdentL, IdentifierInfo *II,
5334 SourceLocation GnuLabelL) {
5335 assert(GnuLabelL != IdentL && "Use this only for GNU local labels");
5336 return new (C, DC) LabelDecl(DC, IdentL, II, nullptr, GnuLabelL);
5337}
5338
5339LabelDecl *LabelDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID) {
5340 return new (C, ID) LabelDecl(nullptr, SourceLocation(), nullptr, nullptr,
5341 SourceLocation());
5342}
5343
5344void LabelDecl::setMSAsmLabel(StringRef Name) {
5345char *Buffer = new (getASTContext(), 1) char[Name.size() + 1];
5346 memcpy(dest: Buffer, src: Name.data(), n: Name.size());
5347 Buffer[Name.size()] = '\0';
5348 MSAsmName = Buffer;
5349}
5350
5351void ValueDecl::anchor() {}
5352
5353bool ValueDecl::isWeak() const {
5354 auto *MostRecent = getMostRecentDecl();
5355 return MostRecent->hasAttr<WeakAttr>() ||
5356 MostRecent->hasAttr<WeakRefAttr>() || isWeakImported();
5357}
5358
5359bool ValueDecl::isInitCapture() const {
5360 if (auto *Var = llvm::dyn_cast<VarDecl>(Val: this))
5361 return Var->isInitCapture();
5362 return false;
5363}
5364
5365void ImplicitParamDecl::anchor() {}
5366
5367ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, DeclContext *DC,
5368 SourceLocation IdLoc,
5369 IdentifierInfo *Id, QualType Type,
5370 ImplicitParamKind ParamKind) {
5371 return new (C, DC) ImplicitParamDecl(C, DC, IdLoc, Id, Type, ParamKind);
5372}
5373
5374ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, QualType Type,
5375 ImplicitParamKind ParamKind) {
5376 return new (C, nullptr) ImplicitParamDecl(C, Type, ParamKind);
5377}
5378
5379ImplicitParamDecl *ImplicitParamDecl::CreateDeserialized(ASTContext &C,
5380 GlobalDeclID ID) {
5381 return new (C, ID) ImplicitParamDecl(C, QualType(), ImplicitParamKind::Other);
5382}
5383
5384FunctionDecl *
5385FunctionDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
5386 const DeclarationNameInfo &NameInfo, QualType T,
5387 TypeSourceInfo *TInfo, StorageClass SC, bool UsesFPIntrin,
5388 bool isInlineSpecified, bool hasWrittenPrototype,
5389 ConstexprSpecKind ConstexprKind,
5390 Expr *TrailingRequiresClause) {
5391 FunctionDecl *New = new (C, DC) FunctionDecl(
5392 Function, C, DC, StartLoc, NameInfo, T, TInfo, SC, UsesFPIntrin,
5393 isInlineSpecified, ConstexprKind, TrailingRequiresClause);
5394 New->setHasWrittenPrototype(hasWrittenPrototype);
5395 return New;
5396}
5397
5398FunctionDecl *FunctionDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID) {
5399 return new (C, ID) FunctionDecl(
5400 Function, C, nullptr, SourceLocation(), DeclarationNameInfo(), QualType(),
5401 nullptr, SC_None, false, false, ConstexprSpecKind::Unspecified, nullptr);
5402}
5403
5404BlockDecl *BlockDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) {
5405 return new (C, DC) BlockDecl(DC, L);
5406}
5407
5408BlockDecl *BlockDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID) {
5409 return new (C, ID) BlockDecl(nullptr, SourceLocation());
5410}
5411
5412CapturedDecl::CapturedDecl(DeclContext *DC, unsigned NumParams)
5413 : Decl(Captured, DC, SourceLocation()), DeclContext(Captured),
5414 NumParams(NumParams), ContextParam(0), BodyAndNothrow(nullptr, false) {}
5415
5416CapturedDecl *CapturedDecl::Create(ASTContext &C, DeclContext *DC,
5417 unsigned NumParams) {
5418 return new (C, DC, additionalSizeToAlloc<ImplicitParamDecl *>(Counts: NumParams))
5419 CapturedDecl(DC, NumParams);
5420}
5421
5422CapturedDecl *CapturedDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID,
5423 unsigned NumParams) {
5424 return new (C, ID, additionalSizeToAlloc<ImplicitParamDecl *>(Counts: NumParams))
5425 CapturedDecl(nullptr, NumParams);
5426}
5427
5428Stmt *CapturedDecl::getBody() const { return BodyAndNothrow.getPointer(); }
5429void CapturedDecl::setBody(Stmt *B) { BodyAndNothrow.setPointer(B); }
5430
5431bool CapturedDecl::isNothrow() const { return BodyAndNothrow.getInt(); }
5432void CapturedDecl::setNothrow(bool Nothrow) { BodyAndNothrow.setInt(Nothrow); }
5433
5434EnumConstantDecl::EnumConstantDecl(const ASTContext &C, DeclContext *DC,
5435 SourceLocation L, IdentifierInfo *Id,
5436 QualType T, Expr *E, const llvm::APSInt &V)
5437 : ValueDecl(EnumConstant, DC, L, Id, T), Init((Stmt *)E) {
5438 setInitVal(C, V);
5439}
5440
5441EnumConstantDecl *EnumConstantDecl::Create(ASTContext &C, EnumDecl *CD,
5442 SourceLocation L,
5443 IdentifierInfo *Id, QualType T,
5444 Expr *E, const llvm::APSInt &V) {
5445 return new (C, CD) EnumConstantDecl(C, CD, L, Id, T, E, V);
5446}
5447
5448EnumConstantDecl *EnumConstantDecl::CreateDeserialized(ASTContext &C,
5449 GlobalDeclID ID) {
5450 return new (C, ID) EnumConstantDecl(C, nullptr, SourceLocation(), nullptr,
5451 QualType(), nullptr, llvm::APSInt());
5452}
5453
5454void IndirectFieldDecl::anchor() {}
5455
5456IndirectFieldDecl::IndirectFieldDecl(ASTContext &C, DeclContext *DC,
5457 SourceLocation L, DeclarationName N,
5458 QualType T,
5459 MutableArrayRef<NamedDecl *> CH)
5460 : ValueDecl(IndirectField, DC, L, N, T), Chaining(CH.data()),
5461 ChainingSize(CH.size()) {
5462 // In C++, indirect field declarations conflict with tag declarations in the
5463 // same scope, so add them to IDNS_Tag so that tag redeclaration finds them.
5464 if (C.getLangOpts().CPlusPlus)
5465 IdentifierNamespace |= IDNS_Tag;
5466}
5467
5468IndirectFieldDecl *
5469IndirectFieldDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L,
5470 const IdentifierInfo *Id, QualType T,
5471 llvm::MutableArrayRef<NamedDecl *> CH) {
5472 return new (C, DC) IndirectFieldDecl(C, DC, L, Id, T, CH);
5473}
5474
5475IndirectFieldDecl *IndirectFieldDecl::CreateDeserialized(ASTContext &C,
5476 GlobalDeclID ID) {
5477 return new (C, ID)
5478 IndirectFieldDecl(C, nullptr, SourceLocation(), DeclarationName(),
5479 QualType(), std::nullopt);
5480}
5481
5482SourceRange EnumConstantDecl::getSourceRange() const {
5483 SourceLocation End = getLocation();
5484 if (Init)
5485 End = Init->getEndLoc();
5486 return SourceRange(getLocation(), End);
5487}
5488
5489void TypeDecl::anchor() {}
5490
5491TypedefDecl *TypedefDecl::Create(ASTContext &C, DeclContext *DC,
5492 SourceLocation StartLoc, SourceLocation IdLoc,
5493 const IdentifierInfo *Id,
5494 TypeSourceInfo *TInfo) {
5495 return new (C, DC) TypedefDecl(C, DC, StartLoc, IdLoc, Id, TInfo);
5496}
5497
5498void TypedefNameDecl::anchor() {}
5499
5500TagDecl *TypedefNameDecl::getAnonDeclWithTypedefName(bool AnyRedecl) const {
5501 if (auto *TT = getTypeSourceInfo()->getType()->getAs<TagType>()) {
5502 auto *OwningTypedef = TT->getDecl()->getTypedefNameForAnonDecl();
5503 auto *ThisTypedef = this;
5504 if (AnyRedecl && OwningTypedef) {
5505 OwningTypedef = OwningTypedef->getCanonicalDecl();
5506 ThisTypedef = ThisTypedef->getCanonicalDecl();
5507 }
5508 if (OwningTypedef == ThisTypedef)
5509 return TT->getDecl();
5510 }
5511
5512 return nullptr;
5513}
5514
5515bool TypedefNameDecl::isTransparentTagSlow() const {
5516 auto determineIsTransparent = [&]() {
5517 if (auto *TT = getUnderlyingType()->getAs<TagType>()) {
5518 if (auto *TD = TT->getDecl()) {
5519 if (TD->getName() != getName())
5520 return false;
5521 SourceLocation TTLoc = getLocation();
5522 SourceLocation TDLoc = TD->getLocation();
5523 if (!TTLoc.isMacroID() || !TDLoc.isMacroID())
5524 return false;
5525 SourceManager &SM = getASTContext().getSourceManager();
5526 return SM.getSpellingLoc(Loc: TTLoc) == SM.getSpellingLoc(Loc: TDLoc);
5527 }
5528 }
5529 return false;
5530 };
5531
5532 bool isTransparent = determineIsTransparent();
5533 MaybeModedTInfo.setInt((isTransparent << 1) | 1);
5534 return isTransparent;
5535}
5536
5537TypedefDecl *TypedefDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID) {
5538 return new (C, ID) TypedefDecl(C, nullptr, SourceLocation(), SourceLocation(),
5539 nullptr, nullptr);
5540}
5541
5542TypeAliasDecl *TypeAliasDecl::Create(ASTContext &C, DeclContext *DC,
5543 SourceLocation StartLoc,
5544 SourceLocation IdLoc,
5545 const IdentifierInfo *Id,
5546 TypeSourceInfo *TInfo) {
5547 return new (C, DC) TypeAliasDecl(C, DC, StartLoc, IdLoc, Id, TInfo);
5548}
5549
5550TypeAliasDecl *TypeAliasDecl::CreateDeserialized(ASTContext &C,
5551 GlobalDeclID ID) {
5552 return new (C, ID) TypeAliasDecl(C, nullptr, SourceLocation(),
5553 SourceLocation(), nullptr, nullptr);
5554}
5555
5556SourceRange TypedefDecl::getSourceRange() const {
5557 SourceLocation RangeEnd = getLocation();
5558 if (TypeSourceInfo *TInfo = getTypeSourceInfo()) {
5559 if (typeIsPostfix(QT: TInfo->getType()))
5560 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
5561 }
5562 return SourceRange(getBeginLoc(), RangeEnd);
5563}
5564
5565SourceRange TypeAliasDecl::getSourceRange() const {
5566 SourceLocation RangeEnd = getBeginLoc();
5567 if (TypeSourceInfo *TInfo = getTypeSourceInfo())
5568 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
5569 return SourceRange(getBeginLoc(), RangeEnd);
5570}
5571
5572void FileScopeAsmDecl::anchor() {}
5573
5574FileScopeAsmDecl *FileScopeAsmDecl::Create(ASTContext &C, DeclContext *DC,
5575 StringLiteral *Str,
5576 SourceLocation AsmLoc,
5577 SourceLocation RParenLoc) {
5578 return new (C, DC) FileScopeAsmDecl(DC, Str, AsmLoc, RParenLoc);
5579}
5580
5581FileScopeAsmDecl *FileScopeAsmDecl::CreateDeserialized(ASTContext &C,
5582 GlobalDeclID ID) {
5583 return new (C, ID) FileScopeAsmDecl(nullptr, nullptr, SourceLocation(),
5584 SourceLocation());
5585}
5586
5587void TopLevelStmtDecl::anchor() {}
5588
5589TopLevelStmtDecl *TopLevelStmtDecl::Create(ASTContext &C, Stmt *Statement) {
5590 assert(C.getLangOpts().IncrementalExtensions &&
5591 "Must be used only in incremental mode");
5592
5593 SourceLocation Loc = Statement ? Statement->getBeginLoc() : SourceLocation();
5594 DeclContext *DC = C.getTranslationUnitDecl();
5595
5596 return new (C, DC) TopLevelStmtDecl(DC, Loc, Statement);
5597}
5598
5599TopLevelStmtDecl *TopLevelStmtDecl::CreateDeserialized(ASTContext &C,
5600 GlobalDeclID ID) {
5601 return new (C, ID)
5602 TopLevelStmtDecl(/*DC=*/nullptr, SourceLocation(), /*S=*/nullptr);
5603}
5604
5605SourceRange TopLevelStmtDecl::getSourceRange() const {
5606 return SourceRange(getLocation(), Statement->getEndLoc());
5607}
5608
5609void TopLevelStmtDecl::setStmt(Stmt *S) {
5610 assert(S);
5611 Statement = S;
5612 setLocation(Statement->getBeginLoc());
5613}
5614
5615void EmptyDecl::anchor() {}
5616
5617EmptyDecl *EmptyDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) {
5618 return new (C, DC) EmptyDecl(DC, L);
5619}
5620
5621EmptyDecl *EmptyDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID) {
5622 return new (C, ID) EmptyDecl(nullptr, SourceLocation());
5623}
5624
5625HLSLBufferDecl::HLSLBufferDecl(DeclContext *DC, bool CBuffer,
5626 SourceLocation KwLoc, IdentifierInfo *ID,
5627 SourceLocation IDLoc, SourceLocation LBrace)
5628 : NamedDecl(Decl::Kind::HLSLBuffer, DC, IDLoc, DeclarationName(ID)),
5629 DeclContext(Decl::Kind::HLSLBuffer), LBraceLoc(LBrace), KwLoc(KwLoc),
5630 IsCBuffer(CBuffer) {}
5631
5632HLSLBufferDecl *HLSLBufferDecl::Create(ASTContext &C,
5633 DeclContext *LexicalParent, bool CBuffer,
5634 SourceLocation KwLoc, IdentifierInfo *ID,
5635 SourceLocation IDLoc,
5636 SourceLocation LBrace) {
5637 // For hlsl like this
5638 // cbuffer A {
5639 // cbuffer B {
5640 // }
5641 // }
5642 // compiler should treat it as
5643 // cbuffer A {
5644 // }
5645 // cbuffer B {
5646 // }
5647 // FIXME: support nested buffers if required for back-compat.
5648 DeclContext *DC = LexicalParent;
5649 HLSLBufferDecl *Result =
5650 new (C, DC) HLSLBufferDecl(DC, CBuffer, KwLoc, ID, IDLoc, LBrace);
5651 return Result;
5652}
5653
5654HLSLBufferDecl *HLSLBufferDecl::CreateDeserialized(ASTContext &C,
5655 GlobalDeclID ID) {
5656 return new (C, ID) HLSLBufferDecl(nullptr, false, SourceLocation(), nullptr,
5657 SourceLocation(), SourceLocation());
5658}
5659
5660//===----------------------------------------------------------------------===//
5661// ImportDecl Implementation
5662//===----------------------------------------------------------------------===//
5663
5664/// Retrieve the number of module identifiers needed to name the given
5665/// module.
5666static unsigned getNumModuleIdentifiers(Module *Mod) {
5667 unsigned Result = 1;
5668 while (Mod->Parent) {
5669 Mod = Mod->Parent;
5670 ++Result;
5671 }
5672 return Result;
5673}
5674
5675ImportDecl::ImportDecl(DeclContext *DC, SourceLocation StartLoc,
5676 Module *Imported,
5677 ArrayRef<SourceLocation> IdentifierLocs)
5678 : Decl(Import, DC, StartLoc), ImportedModule(Imported),
5679 NextLocalImportAndComplete(nullptr, true) {
5680 assert(getNumModuleIdentifiers(Imported) == IdentifierLocs.size());
5681 auto *StoredLocs = getTrailingObjects<SourceLocation>();
5682 std::uninitialized_copy(first: IdentifierLocs.begin(), last: IdentifierLocs.end(),
5683 result: StoredLocs);
5684}
5685
5686ImportDecl::ImportDecl(DeclContext *DC, SourceLocation StartLoc,
5687 Module *Imported, SourceLocation EndLoc)
5688 : Decl(Import, DC, StartLoc), ImportedModule(Imported),
5689 NextLocalImportAndComplete(nullptr, false) {
5690 *getTrailingObjects<SourceLocation>() = EndLoc;
5691}
5692
5693ImportDecl *ImportDecl::Create(ASTContext &C, DeclContext *DC,
5694 SourceLocation StartLoc, Module *Imported,
5695 ArrayRef<SourceLocation> IdentifierLocs) {
5696 return new (C, DC,
5697 additionalSizeToAlloc<SourceLocation>(Counts: IdentifierLocs.size()))
5698 ImportDecl(DC, StartLoc, Imported, IdentifierLocs);
5699}
5700
5701ImportDecl *ImportDecl::CreateImplicit(ASTContext &C, DeclContext *DC,
5702 SourceLocation StartLoc,
5703 Module *Imported,
5704 SourceLocation EndLoc) {
5705 ImportDecl *Import = new (C, DC, additionalSizeToAlloc<SourceLocation>(Counts: 1))
5706 ImportDecl(DC, StartLoc, Imported, EndLoc);
5707 Import->setImplicit();
5708 return Import;
5709}
5710
5711ImportDecl *ImportDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID,
5712 unsigned NumLocations) {
5713 return new (C, ID, additionalSizeToAlloc<SourceLocation>(Counts: NumLocations))
5714 ImportDecl(EmptyShell());
5715}
5716
5717ArrayRef<SourceLocation> ImportDecl::getIdentifierLocs() const {
5718 if (!isImportComplete())
5719 return std::nullopt;
5720
5721 const auto *StoredLocs = getTrailingObjects<SourceLocation>();
5722 return llvm::ArrayRef(StoredLocs,
5723 getNumModuleIdentifiers(Mod: getImportedModule()));
5724}
5725
5726SourceRange ImportDecl::getSourceRange() const {
5727 if (!isImportComplete())
5728 return SourceRange(getLocation(), *getTrailingObjects<SourceLocation>());
5729
5730 return SourceRange(getLocation(), getIdentifierLocs().back());
5731}
5732
5733//===----------------------------------------------------------------------===//
5734// ExportDecl Implementation
5735//===----------------------------------------------------------------------===//
5736
5737void ExportDecl::anchor() {}
5738
5739ExportDecl *ExportDecl::Create(ASTContext &C, DeclContext *DC,
5740 SourceLocation ExportLoc) {
5741 return new (C, DC) ExportDecl(DC, ExportLoc);
5742}
5743
5744ExportDecl *ExportDecl::CreateDeserialized(ASTContext &C, GlobalDeclID ID) {
5745 return new (C, ID) ExportDecl(nullptr, SourceLocation());
5746}
5747
5748bool clang::IsArmStreamingFunction(const FunctionDecl *FD,
5749 bool IncludeLocallyStreaming) {
5750 if (IncludeLocallyStreaming)
5751 if (FD->hasAttr<ArmLocallyStreamingAttr>())
5752 return true;
5753
5754 if (const Type *Ty = FD->getType().getTypePtrOrNull())
5755 if (const auto *FPT = Ty->getAs<FunctionProtoType>())
5756 if (FPT->getAArch64SMEAttributes() &
5757 FunctionType::SME_PStateSMEnabledMask)
5758 return true;
5759
5760 return false;
5761}
5762