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/Redeclarable.h"
34 #include "clang/AST/Stmt.h"
35 #include "clang/AST/TemplateBase.h"
36 #include "clang/AST/Type.h"
37 #include "clang/AST/TypeLoc.h"
38 #include "clang/Basic/Builtins.h"
39 #include "clang/Basic/IdentifierTable.h"
40 #include "clang/Basic/LLVM.h"
41 #include "clang/Basic/LangOptions.h"
42 #include "clang/Basic/Linkage.h"
43 #include "clang/Basic/Module.h"
44 #include "clang/Basic/PartialDiagnostic.h"
45 #include "clang/Basic/SanitizerBlacklist.h"
46 #include "clang/Basic/Sanitizers.h"
47 #include "clang/Basic/SourceLocation.h"
48 #include "clang/Basic/SourceManager.h"
49 #include "clang/Basic/Specifiers.h"
50 #include "clang/Basic/TargetCXXABI.h"
51 #include "clang/Basic/TargetInfo.h"
52 #include "clang/Basic/Visibility.h"
53 #include "llvm/ADT/APSInt.h"
54 #include "llvm/ADT/ArrayRef.h"
55 #include "llvm/ADT/None.h"
56 #include "llvm/ADT/Optional.h"
57 #include "llvm/ADT/STLExtras.h"
58 #include "llvm/ADT/SmallVector.h"
59 #include "llvm/ADT/StringRef.h"
60 #include "llvm/ADT/StringSwitch.h"
61 #include "llvm/ADT/Triple.h"
62 #include "llvm/Support/Casting.h"
63 #include "llvm/Support/ErrorHandling.h"
64 #include "llvm/Support/raw_ostream.h"
65 #include <algorithm>
66 #include <cassert>
67 #include <cstddef>
68 #include <cstring>
69 #include <memory>
70 #include <string>
71 #include <tuple>
72 #include <type_traits>
73
74 using namespace clang;
75
getPrimaryMergedDecl(Decl * D)76 Decl *clang::getPrimaryMergedDecl(Decl *D) {
77 return D->getASTContext().getPrimaryMergedDecl(D);
78 }
79
print(raw_ostream & OS) const80 void PrettyDeclStackTraceEntry::print(raw_ostream &OS) const {
81 SourceLocation Loc = this->Loc;
82 if (!Loc.isValid() && TheDecl) Loc = TheDecl->getLocation();
83 if (Loc.isValid()) {
84 Loc.print(OS, Context.getSourceManager());
85 OS << ": ";
86 }
87 OS << Message;
88
89 if (auto *ND = dyn_cast_or_null<NamedDecl>(TheDecl)) {
90 OS << " '";
91 ND->getNameForDiagnostic(OS, Context.getPrintingPolicy(), true);
92 OS << "'";
93 }
94
95 OS << '\n';
96 }
97
98 // Defined here so that it can be inlined into its direct callers.
isOutOfLine() const99 bool Decl::isOutOfLine() const {
100 return !getLexicalDeclContext()->Equals(getDeclContext());
101 }
102
TranslationUnitDecl(ASTContext & ctx)103 TranslationUnitDecl::TranslationUnitDecl(ASTContext &ctx)
104 : Decl(TranslationUnit, nullptr, SourceLocation()),
105 DeclContext(TranslationUnit), Ctx(ctx) {}
106
107 //===----------------------------------------------------------------------===//
108 // NamedDecl Implementation
109 //===----------------------------------------------------------------------===//
110
111 // Visibility rules aren't rigorously externally specified, but here
112 // are the basic principles behind what we implement:
113 //
114 // 1. An explicit visibility attribute is generally a direct expression
115 // of the user's intent and should be honored. Only the innermost
116 // visibility attribute applies. If no visibility attribute applies,
117 // global visibility settings are considered.
118 //
119 // 2. There is one caveat to the above: on or in a template pattern,
120 // an explicit visibility attribute is just a default rule, and
121 // visibility can be decreased by the visibility of template
122 // arguments. But this, too, has an exception: an attribute on an
123 // explicit specialization or instantiation causes all the visibility
124 // restrictions of the template arguments to be ignored.
125 //
126 // 3. A variable that does not otherwise have explicit visibility can
127 // be restricted by the visibility of its type.
128 //
129 // 4. A visibility restriction is explicit if it comes from an
130 // attribute (or something like it), not a global visibility setting.
131 // When emitting a reference to an external symbol, visibility
132 // restrictions are ignored unless they are explicit.
133 //
134 // 5. When computing the visibility of a non-type, including a
135 // non-type member of a class, only non-type visibility restrictions
136 // are considered: the 'visibility' attribute, global value-visibility
137 // settings, and a few special cases like __private_extern.
138 //
139 // 6. When computing the visibility of a type, including a type member
140 // of a class, only type visibility restrictions are considered:
141 // the 'type_visibility' attribute and global type-visibility settings.
142 // However, a 'visibility' attribute counts as a 'type_visibility'
143 // attribute on any declaration that only has the former.
144 //
145 // The visibility of a "secondary" entity, like a template argument,
146 // is computed using the kind of that entity, not the kind of the
147 // primary entity for which we are computing visibility. For example,
148 // the visibility of a specialization of either of these templates:
149 // template <class T, bool (&compare)(T, X)> bool has_match(list<T>, X);
150 // template <class T, bool (&compare)(T, X)> class matcher;
151 // is restricted according to the type visibility of the argument 'T',
152 // the type visibility of 'bool(&)(T,X)', and the value visibility of
153 // the argument function 'compare'. That 'has_match' is a value
154 // and 'matcher' is a type only matters when looking for attributes
155 // and settings from the immediate context.
156
157 /// Does this computation kind permit us to consider additional
158 /// visibility settings from attributes and the like?
hasExplicitVisibilityAlready(LVComputationKind computation)159 static bool hasExplicitVisibilityAlready(LVComputationKind computation) {
160 return computation.IgnoreExplicitVisibility;
161 }
162
163 /// Given an LVComputationKind, return one of the same type/value sort
164 /// that records that it already has explicit visibility.
165 static LVComputationKind
withExplicitVisibilityAlready(LVComputationKind Kind)166 withExplicitVisibilityAlready(LVComputationKind Kind) {
167 Kind.IgnoreExplicitVisibility = true;
168 return Kind;
169 }
170
getExplicitVisibility(const NamedDecl * D,LVComputationKind kind)171 static Optional<Visibility> getExplicitVisibility(const NamedDecl *D,
172 LVComputationKind kind) {
173 assert(!kind.IgnoreExplicitVisibility &&
174 "asking for explicit visibility when we shouldn't be");
175 return D->getExplicitVisibility(kind.getExplicitVisibilityKind());
176 }
177
178 /// Is the given declaration a "type" or a "value" for the purposes of
179 /// visibility computation?
usesTypeVisibility(const NamedDecl * D)180 static bool usesTypeVisibility(const NamedDecl *D) {
181 return isa<TypeDecl>(D) ||
182 isa<ClassTemplateDecl>(D) ||
183 isa<ObjCInterfaceDecl>(D);
184 }
185
186 /// Does the given declaration have member specialization information,
187 /// and if so, is it an explicit specialization?
188 template <class T> static typename
189 std::enable_if<!std::is_base_of<RedeclarableTemplateDecl, T>::value, bool>::type
isExplicitMemberSpecialization(const T * D)190 isExplicitMemberSpecialization(const T *D) {
191 if (const MemberSpecializationInfo *member =
192 D->getMemberSpecializationInfo()) {
193 return member->isExplicitSpecialization();
194 }
195 return false;
196 }
197
198 /// For templates, this question is easier: a member template can't be
199 /// explicitly instantiated, so there's a single bit indicating whether
200 /// or not this is an explicit member specialization.
isExplicitMemberSpecialization(const RedeclarableTemplateDecl * D)201 static bool isExplicitMemberSpecialization(const RedeclarableTemplateDecl *D) {
202 return D->isMemberSpecialization();
203 }
204
205 /// Given a visibility attribute, return the explicit visibility
206 /// associated with it.
207 template <class T>
getVisibilityFromAttr(const T * attr)208 static Visibility getVisibilityFromAttr(const T *attr) {
209 switch (attr->getVisibility()) {
210 case T::Default:
211 return DefaultVisibility;
212 case T::Hidden:
213 return HiddenVisibility;
214 case T::Protected:
215 return ProtectedVisibility;
216 }
217 llvm_unreachable("bad visibility kind");
218 }
219
220 /// Return the explicit visibility of the given declaration.
getVisibilityOf(const NamedDecl * D,NamedDecl::ExplicitVisibilityKind kind)221 static Optional<Visibility> getVisibilityOf(const NamedDecl *D,
222 NamedDecl::ExplicitVisibilityKind kind) {
223 // If we're ultimately computing the visibility of a type, look for
224 // a 'type_visibility' attribute before looking for 'visibility'.
225 if (kind == NamedDecl::VisibilityForType) {
226 if (const auto *A = D->getAttr<TypeVisibilityAttr>()) {
227 return getVisibilityFromAttr(A);
228 }
229 }
230
231 // If this declaration has an explicit visibility attribute, use it.
232 if (const auto *A = D->getAttr<VisibilityAttr>()) {
233 return getVisibilityFromAttr(A);
234 }
235
236 return None;
237 }
238
getLVForType(const Type & T,LVComputationKind computation)239 LinkageInfo LinkageComputer::getLVForType(const Type &T,
240 LVComputationKind computation) {
241 if (computation.IgnoreAllVisibility)
242 return LinkageInfo(T.getLinkage(), DefaultVisibility, true);
243 return getTypeLinkageAndVisibility(&T);
244 }
245
246 /// Get the most restrictive linkage for the types in the given
247 /// template parameter list. For visibility purposes, template
248 /// parameters are part of the signature of a template.
getLVForTemplateParameterList(const TemplateParameterList * Params,LVComputationKind computation)249 LinkageInfo LinkageComputer::getLVForTemplateParameterList(
250 const TemplateParameterList *Params, LVComputationKind computation) {
251 LinkageInfo LV;
252 for (const NamedDecl *P : *Params) {
253 // Template type parameters are the most common and never
254 // contribute to visibility, pack or not.
255 if (isa<TemplateTypeParmDecl>(P))
256 continue;
257
258 // Non-type template parameters can be restricted by the value type, e.g.
259 // template <enum X> class A { ... };
260 // We have to be careful here, though, because we can be dealing with
261 // dependent types.
262 if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) {
263 // Handle the non-pack case first.
264 if (!NTTP->isExpandedParameterPack()) {
265 if (!NTTP->getType()->isDependentType()) {
266 LV.merge(getLVForType(*NTTP->getType(), computation));
267 }
268 continue;
269 }
270
271 // Look at all the types in an expanded pack.
272 for (unsigned i = 0, n = NTTP->getNumExpansionTypes(); i != n; ++i) {
273 QualType type = NTTP->getExpansionType(i);
274 if (!type->isDependentType())
275 LV.merge(getTypeLinkageAndVisibility(type));
276 }
277 continue;
278 }
279
280 // Template template parameters can be restricted by their
281 // template parameters, recursively.
282 const auto *TTP = cast<TemplateTemplateParmDecl>(P);
283
284 // Handle the non-pack case first.
285 if (!TTP->isExpandedParameterPack()) {
286 LV.merge(getLVForTemplateParameterList(TTP->getTemplateParameters(),
287 computation));
288 continue;
289 }
290
291 // Look at all expansions in an expanded pack.
292 for (unsigned i = 0, n = TTP->getNumExpansionTemplateParameters();
293 i != n; ++i) {
294 LV.merge(getLVForTemplateParameterList(
295 TTP->getExpansionTemplateParameters(i), computation));
296 }
297 }
298
299 return LV;
300 }
301
getOutermostFuncOrBlockContext(const Decl * D)302 static const Decl *getOutermostFuncOrBlockContext(const Decl *D) {
303 const Decl *Ret = nullptr;
304 const DeclContext *DC = D->getDeclContext();
305 while (DC->getDeclKind() != Decl::TranslationUnit) {
306 if (isa<FunctionDecl>(DC) || isa<BlockDecl>(DC))
307 Ret = cast<Decl>(DC);
308 DC = DC->getParent();
309 }
310 return Ret;
311 }
312
313 /// Get the most restrictive linkage for the types and
314 /// declarations in the given template argument list.
315 ///
316 /// Note that we don't take an LVComputationKind because we always
317 /// want to honor the visibility of template arguments in the same way.
318 LinkageInfo
getLVForTemplateArgumentList(ArrayRef<TemplateArgument> Args,LVComputationKind computation)319 LinkageComputer::getLVForTemplateArgumentList(ArrayRef<TemplateArgument> Args,
320 LVComputationKind computation) {
321 LinkageInfo LV;
322
323 for (const TemplateArgument &Arg : Args) {
324 switch (Arg.getKind()) {
325 case TemplateArgument::Null:
326 case TemplateArgument::Integral:
327 case TemplateArgument::Expression:
328 continue;
329
330 case TemplateArgument::Type:
331 LV.merge(getLVForType(*Arg.getAsType(), computation));
332 continue;
333
334 case TemplateArgument::Declaration: {
335 const NamedDecl *ND = Arg.getAsDecl();
336 assert(!usesTypeVisibility(ND));
337 LV.merge(getLVForDecl(ND, computation));
338 continue;
339 }
340
341 case TemplateArgument::NullPtr:
342 LV.merge(getTypeLinkageAndVisibility(Arg.getNullPtrType()));
343 continue;
344
345 case TemplateArgument::Template:
346 case TemplateArgument::TemplateExpansion:
347 if (TemplateDecl *Template =
348 Arg.getAsTemplateOrTemplatePattern().getAsTemplateDecl())
349 LV.merge(getLVForDecl(Template, computation));
350 continue;
351
352 case TemplateArgument::Pack:
353 LV.merge(getLVForTemplateArgumentList(Arg.getPackAsArray(), computation));
354 continue;
355 }
356 llvm_unreachable("bad template argument kind");
357 }
358
359 return LV;
360 }
361
362 LinkageInfo
getLVForTemplateArgumentList(const TemplateArgumentList & TArgs,LVComputationKind computation)363 LinkageComputer::getLVForTemplateArgumentList(const TemplateArgumentList &TArgs,
364 LVComputationKind computation) {
365 return getLVForTemplateArgumentList(TArgs.asArray(), computation);
366 }
367
shouldConsiderTemplateVisibility(const FunctionDecl * fn,const FunctionTemplateSpecializationInfo * specInfo)368 static bool shouldConsiderTemplateVisibility(const FunctionDecl *fn,
369 const FunctionTemplateSpecializationInfo *specInfo) {
370 // Include visibility from the template parameters and arguments
371 // only if this is not an explicit instantiation or specialization
372 // with direct explicit visibility. (Implicit instantiations won't
373 // have a direct attribute.)
374 if (!specInfo->isExplicitInstantiationOrSpecialization())
375 return true;
376
377 return !fn->hasAttr<VisibilityAttr>();
378 }
379
380 /// Merge in template-related linkage and visibility for the given
381 /// function template specialization.
382 ///
383 /// We don't need a computation kind here because we can assume
384 /// LVForValue.
385 ///
386 /// \param[out] LV the computation to use for the parent
mergeTemplateLV(LinkageInfo & LV,const FunctionDecl * fn,const FunctionTemplateSpecializationInfo * specInfo,LVComputationKind computation)387 void LinkageComputer::mergeTemplateLV(
388 LinkageInfo &LV, const FunctionDecl *fn,
389 const FunctionTemplateSpecializationInfo *specInfo,
390 LVComputationKind computation) {
391 bool considerVisibility =
392 shouldConsiderTemplateVisibility(fn, specInfo);
393
394 // Merge information from the template parameters.
395 FunctionTemplateDecl *temp = specInfo->getTemplate();
396 LinkageInfo tempLV =
397 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
398 LV.mergeMaybeWithVisibility(tempLV, considerVisibility);
399
400 // Merge information from the template arguments.
401 const TemplateArgumentList &templateArgs = *specInfo->TemplateArguments;
402 LinkageInfo argsLV = getLVForTemplateArgumentList(templateArgs, computation);
403 LV.mergeMaybeWithVisibility(argsLV, considerVisibility);
404 }
405
406 /// Does the given declaration have a direct visibility attribute
407 /// that would match the given rules?
hasDirectVisibilityAttribute(const NamedDecl * D,LVComputationKind computation)408 static bool hasDirectVisibilityAttribute(const NamedDecl *D,
409 LVComputationKind computation) {
410 if (computation.IgnoreAllVisibility)
411 return false;
412
413 return (computation.isTypeVisibility() && D->hasAttr<TypeVisibilityAttr>()) ||
414 D->hasAttr<VisibilityAttr>();
415 }
416
417 /// Should we consider visibility associated with the template
418 /// arguments and parameters of the given class template specialization?
shouldConsiderTemplateVisibility(const ClassTemplateSpecializationDecl * spec,LVComputationKind computation)419 static bool shouldConsiderTemplateVisibility(
420 const ClassTemplateSpecializationDecl *spec,
421 LVComputationKind computation) {
422 // Include visibility from the template parameters and arguments
423 // only if this is not an explicit instantiation or specialization
424 // with direct explicit visibility (and note that implicit
425 // instantiations won't have a direct attribute).
426 //
427 // Furthermore, we want to ignore template parameters and arguments
428 // for an explicit specialization when computing the visibility of a
429 // member thereof with explicit visibility.
430 //
431 // This is a bit complex; let's unpack it.
432 //
433 // An explicit class specialization is an independent, top-level
434 // declaration. As such, if it or any of its members has an
435 // explicit visibility attribute, that must directly express the
436 // user's intent, and we should honor it. The same logic applies to
437 // an explicit instantiation of a member of such a thing.
438
439 // Fast path: if this is not an explicit instantiation or
440 // specialization, we always want to consider template-related
441 // visibility restrictions.
442 if (!spec->isExplicitInstantiationOrSpecialization())
443 return true;
444
445 // This is the 'member thereof' check.
446 if (spec->isExplicitSpecialization() &&
447 hasExplicitVisibilityAlready(computation))
448 return false;
449
450 return !hasDirectVisibilityAttribute(spec, computation);
451 }
452
453 /// Merge in template-related linkage and visibility for the given
454 /// class template specialization.
mergeTemplateLV(LinkageInfo & LV,const ClassTemplateSpecializationDecl * spec,LVComputationKind computation)455 void LinkageComputer::mergeTemplateLV(
456 LinkageInfo &LV, const ClassTemplateSpecializationDecl *spec,
457 LVComputationKind computation) {
458 bool considerVisibility = shouldConsiderTemplateVisibility(spec, computation);
459
460 // Merge information from the template parameters, but ignore
461 // visibility if we're only considering template arguments.
462
463 ClassTemplateDecl *temp = spec->getSpecializedTemplate();
464 LinkageInfo tempLV =
465 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
466 LV.mergeMaybeWithVisibility(tempLV,
467 considerVisibility && !hasExplicitVisibilityAlready(computation));
468
469 // Merge information from the template arguments. We ignore
470 // template-argument visibility if we've got an explicit
471 // instantiation with a visibility attribute.
472 const TemplateArgumentList &templateArgs = spec->getTemplateArgs();
473 LinkageInfo argsLV = getLVForTemplateArgumentList(templateArgs, computation);
474 if (considerVisibility)
475 LV.mergeVisibility(argsLV);
476 LV.mergeExternalVisibility(argsLV);
477 }
478
479 /// Should we consider visibility associated with the template
480 /// arguments and parameters of the given variable template
481 /// specialization? As usual, follow class template specialization
482 /// logic up to initialization.
shouldConsiderTemplateVisibility(const VarTemplateSpecializationDecl * spec,LVComputationKind computation)483 static bool shouldConsiderTemplateVisibility(
484 const VarTemplateSpecializationDecl *spec,
485 LVComputationKind computation) {
486 // Include visibility from the template parameters and arguments
487 // only if this is not an explicit instantiation or specialization
488 // with direct explicit visibility (and note that implicit
489 // instantiations won't have a direct attribute).
490 if (!spec->isExplicitInstantiationOrSpecialization())
491 return true;
492
493 // An explicit variable specialization is an independent, top-level
494 // declaration. As such, if it has an explicit visibility attribute,
495 // that must directly express the user's intent, and we should honor
496 // it.
497 if (spec->isExplicitSpecialization() &&
498 hasExplicitVisibilityAlready(computation))
499 return false;
500
501 return !hasDirectVisibilityAttribute(spec, computation);
502 }
503
504 /// Merge in template-related linkage and visibility for the given
505 /// variable template specialization. As usual, follow class template
506 /// specialization logic up to initialization.
mergeTemplateLV(LinkageInfo & LV,const VarTemplateSpecializationDecl * spec,LVComputationKind computation)507 void LinkageComputer::mergeTemplateLV(LinkageInfo &LV,
508 const VarTemplateSpecializationDecl *spec,
509 LVComputationKind computation) {
510 bool considerVisibility = shouldConsiderTemplateVisibility(spec, computation);
511
512 // Merge information from the template parameters, but ignore
513 // visibility if we're only considering template arguments.
514
515 VarTemplateDecl *temp = spec->getSpecializedTemplate();
516 LinkageInfo tempLV =
517 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
518 LV.mergeMaybeWithVisibility(tempLV,
519 considerVisibility && !hasExplicitVisibilityAlready(computation));
520
521 // Merge information from the template arguments. We ignore
522 // template-argument visibility if we've got an explicit
523 // instantiation with a visibility attribute.
524 const TemplateArgumentList &templateArgs = spec->getTemplateArgs();
525 LinkageInfo argsLV = getLVForTemplateArgumentList(templateArgs, computation);
526 if (considerVisibility)
527 LV.mergeVisibility(argsLV);
528 LV.mergeExternalVisibility(argsLV);
529 }
530
useInlineVisibilityHidden(const NamedDecl * D)531 static bool useInlineVisibilityHidden(const NamedDecl *D) {
532 // FIXME: we should warn if -fvisibility-inlines-hidden is used with c.
533 const LangOptions &Opts = D->getASTContext().getLangOpts();
534 if (!Opts.CPlusPlus || !Opts.InlineVisibilityHidden)
535 return false;
536
537 const auto *FD = dyn_cast<FunctionDecl>(D);
538 if (!FD)
539 return false;
540
541 TemplateSpecializationKind TSK = TSK_Undeclared;
542 if (FunctionTemplateSpecializationInfo *spec
543 = FD->getTemplateSpecializationInfo()) {
544 TSK = spec->getTemplateSpecializationKind();
545 } else if (MemberSpecializationInfo *MSI =
546 FD->getMemberSpecializationInfo()) {
547 TSK = MSI->getTemplateSpecializationKind();
548 }
549
550 const FunctionDecl *Def = nullptr;
551 // InlineVisibilityHidden only applies to definitions, and
552 // isInlined() only gives meaningful answers on definitions
553 // anyway.
554 return TSK != TSK_ExplicitInstantiationDeclaration &&
555 TSK != TSK_ExplicitInstantiationDefinition &&
556 FD->hasBody(Def) && Def->isInlined() && !Def->hasAttr<GNUInlineAttr>();
557 }
558
isFirstInExternCContext(T * D)559 template <typename T> static bool isFirstInExternCContext(T *D) {
560 const T *First = D->getFirstDecl();
561 return First->isInExternCContext();
562 }
563
isSingleLineLanguageLinkage(const Decl & D)564 static bool isSingleLineLanguageLinkage(const Decl &D) {
565 if (const auto *SD = dyn_cast<LinkageSpecDecl>(D.getDeclContext()))
566 if (!SD->hasBraces())
567 return true;
568 return false;
569 }
570
571 /// Determine whether D is declared in the purview of a named module.
isInModulePurview(const NamedDecl * D)572 static bool isInModulePurview(const NamedDecl *D) {
573 if (auto *M = D->getOwningModule())
574 return M->isModulePurview();
575 return false;
576 }
577
isExportedFromModuleInterfaceUnit(const NamedDecl * D)578 static bool isExportedFromModuleInterfaceUnit(const NamedDecl *D) {
579 // FIXME: Handle isModulePrivate.
580 switch (D->getModuleOwnershipKind()) {
581 case Decl::ModuleOwnershipKind::Unowned:
582 case Decl::ModuleOwnershipKind::ModulePrivate:
583 return false;
584 case Decl::ModuleOwnershipKind::Visible:
585 case Decl::ModuleOwnershipKind::VisibleWhenImported:
586 return isInModulePurview(D);
587 }
588 llvm_unreachable("unexpected module ownership kind");
589 }
590
getInternalLinkageFor(const NamedDecl * D)591 static LinkageInfo getInternalLinkageFor(const NamedDecl *D) {
592 // Internal linkage declarations within a module interface unit are modeled
593 // as "module-internal linkage", which means that they have internal linkage
594 // formally but can be indirectly accessed from outside the module via inline
595 // functions and templates defined within the module.
596 if (isInModulePurview(D))
597 return LinkageInfo(ModuleInternalLinkage, DefaultVisibility, false);
598
599 return LinkageInfo::internal();
600 }
601
getExternalLinkageFor(const NamedDecl * D)602 static LinkageInfo getExternalLinkageFor(const NamedDecl *D) {
603 // C++ Modules TS [basic.link]/6.8:
604 // - A name declared at namespace scope that does not have internal linkage
605 // by the previous rules and that is introduced by a non-exported
606 // declaration has module linkage.
607 if (isInModulePurview(D) && !isExportedFromModuleInterfaceUnit(
608 cast<NamedDecl>(D->getCanonicalDecl())))
609 return LinkageInfo(ModuleLinkage, DefaultVisibility, false);
610
611 return LinkageInfo::external();
612 }
613
getStorageClass(const Decl * D)614 static StorageClass getStorageClass(const Decl *D) {
615 if (auto *TD = dyn_cast<TemplateDecl>(D))
616 D = TD->getTemplatedDecl();
617 if (D) {
618 if (auto *VD = dyn_cast<VarDecl>(D))
619 return VD->getStorageClass();
620 if (auto *FD = dyn_cast<FunctionDecl>(D))
621 return FD->getStorageClass();
622 }
623 return SC_None;
624 }
625
626 LinkageInfo
getLVForNamespaceScopeDecl(const NamedDecl * D,LVComputationKind computation,bool IgnoreVarTypeLinkage)627 LinkageComputer::getLVForNamespaceScopeDecl(const NamedDecl *D,
628 LVComputationKind computation,
629 bool IgnoreVarTypeLinkage) {
630 assert(D->getDeclContext()->getRedeclContext()->isFileContext() &&
631 "Not a name having namespace scope");
632 ASTContext &Context = D->getASTContext();
633
634 // C++ [basic.link]p3:
635 // A name having namespace scope (3.3.6) has internal linkage if it
636 // is the name of
637
638 if (getStorageClass(D->getCanonicalDecl()) == SC_Static) {
639 // - a variable, variable template, function, or function template
640 // that is explicitly declared static; or
641 // (This bullet corresponds to C99 6.2.2p3.)
642 return getInternalLinkageFor(D);
643 }
644
645 if (const auto *Var = dyn_cast<VarDecl>(D)) {
646 // - a non-template variable of non-volatile const-qualified type, unless
647 // - it is explicitly declared extern, or
648 // - it is inline or exported, or
649 // - it was previously declared and the prior declaration did not have
650 // internal linkage
651 // (There is no equivalent in C99.)
652 if (Context.getLangOpts().CPlusPlus &&
653 Var->getType().isConstQualified() &&
654 !Var->getType().isVolatileQualified() &&
655 !Var->isInline() &&
656 !isExportedFromModuleInterfaceUnit(Var) &&
657 !isa<VarTemplateSpecializationDecl>(Var) &&
658 !Var->getDescribedVarTemplate()) {
659 const VarDecl *PrevVar = Var->getPreviousDecl();
660 if (PrevVar)
661 return getLVForDecl(PrevVar, computation);
662
663 if (Var->getStorageClass() != SC_Extern &&
664 Var->getStorageClass() != SC_PrivateExtern &&
665 !isSingleLineLanguageLinkage(*Var))
666 return getInternalLinkageFor(Var);
667 }
668
669 for (const VarDecl *PrevVar = Var->getPreviousDecl(); PrevVar;
670 PrevVar = PrevVar->getPreviousDecl()) {
671 if (PrevVar->getStorageClass() == SC_PrivateExtern &&
672 Var->getStorageClass() == SC_None)
673 return getDeclLinkageAndVisibility(PrevVar);
674 // Explicitly declared static.
675 if (PrevVar->getStorageClass() == SC_Static)
676 return getInternalLinkageFor(Var);
677 }
678 } else if (const auto *IFD = dyn_cast<IndirectFieldDecl>(D)) {
679 // - a data member of an anonymous union.
680 const VarDecl *VD = IFD->getVarDecl();
681 assert(VD && "Expected a VarDecl in this IndirectFieldDecl!");
682 return getLVForNamespaceScopeDecl(VD, computation, IgnoreVarTypeLinkage);
683 }
684 assert(!isa<FieldDecl>(D) && "Didn't expect a FieldDecl!");
685
686 // FIXME: This gives internal linkage to names that should have no linkage
687 // (those not covered by [basic.link]p6).
688 if (D->isInAnonymousNamespace()) {
689 const auto *Var = dyn_cast<VarDecl>(D);
690 const auto *Func = dyn_cast<FunctionDecl>(D);
691 // FIXME: The check for extern "C" here is not justified by the standard
692 // wording, but we retain it from the pre-DR1113 model to avoid breaking
693 // code.
694 //
695 // C++11 [basic.link]p4:
696 // An unnamed namespace or a namespace declared directly or indirectly
697 // within an unnamed namespace has internal linkage.
698 if ((!Var || !isFirstInExternCContext(Var)) &&
699 (!Func || !isFirstInExternCContext(Func)))
700 return getInternalLinkageFor(D);
701 }
702
703 // Set up the defaults.
704
705 // C99 6.2.2p5:
706 // If the declaration of an identifier for an object has file
707 // scope and no storage-class specifier, its linkage is
708 // external.
709 LinkageInfo LV = getExternalLinkageFor(D);
710
711 if (!hasExplicitVisibilityAlready(computation)) {
712 if (Optional<Visibility> Vis = getExplicitVisibility(D, computation)) {
713 LV.mergeVisibility(*Vis, true);
714 } else {
715 // If we're declared in a namespace with a visibility attribute,
716 // use that namespace's visibility, and it still counts as explicit.
717 for (const DeclContext *DC = D->getDeclContext();
718 !isa<TranslationUnitDecl>(DC);
719 DC = DC->getParent()) {
720 const auto *ND = dyn_cast<NamespaceDecl>(DC);
721 if (!ND) continue;
722 if (Optional<Visibility> Vis = getExplicitVisibility(ND, computation)) {
723 LV.mergeVisibility(*Vis, true);
724 break;
725 }
726 }
727 }
728
729 // Add in global settings if the above didn't give us direct visibility.
730 if (!LV.isVisibilityExplicit()) {
731 // Use global type/value visibility as appropriate.
732 Visibility globalVisibility =
733 computation.isValueVisibility()
734 ? Context.getLangOpts().getValueVisibilityMode()
735 : Context.getLangOpts().getTypeVisibilityMode();
736 LV.mergeVisibility(globalVisibility, /*explicit*/ false);
737
738 // If we're paying attention to global visibility, apply
739 // -finline-visibility-hidden if this is an inline method.
740 if (useInlineVisibilityHidden(D))
741 LV.mergeVisibility(HiddenVisibility, /*visibilityExplicit=*/false);
742 }
743 }
744
745 // C++ [basic.link]p4:
746
747 // A name having namespace scope that has not been given internal linkage
748 // above and that is the name of
749 // [...bullets...]
750 // has its linkage determined as follows:
751 // - if the enclosing namespace has internal linkage, the name has
752 // internal linkage; [handled above]
753 // - otherwise, if the declaration of the name is attached to a named
754 // module and is not exported, the name has module linkage;
755 // - otherwise, the name has external linkage.
756 // LV is currently set up to handle the last two bullets.
757 //
758 // The bullets are:
759
760 // - a variable; or
761 if (const auto *Var = dyn_cast<VarDecl>(D)) {
762 // GCC applies the following optimization to variables and static
763 // data members, but not to functions:
764 //
765 // Modify the variable's LV by the LV of its type unless this is
766 // C or extern "C". This follows from [basic.link]p9:
767 // A type without linkage shall not be used as the type of a
768 // variable or function with external linkage unless
769 // - the entity has C language linkage, or
770 // - the entity is declared within an unnamed namespace, or
771 // - the entity is not used or is defined in the same
772 // translation unit.
773 // and [basic.link]p10:
774 // ...the types specified by all declarations referring to a
775 // given variable or function shall be identical...
776 // C does not have an equivalent rule.
777 //
778 // Ignore this if we've got an explicit attribute; the user
779 // probably knows what they're doing.
780 //
781 // Note that we don't want to make the variable non-external
782 // because of this, but unique-external linkage suits us.
783 if (Context.getLangOpts().CPlusPlus && !isFirstInExternCContext(Var) &&
784 !IgnoreVarTypeLinkage) {
785 LinkageInfo TypeLV = getLVForType(*Var->getType(), computation);
786 if (!isExternallyVisible(TypeLV.getLinkage()))
787 return LinkageInfo::uniqueExternal();
788 if (!LV.isVisibilityExplicit())
789 LV.mergeVisibility(TypeLV);
790 }
791
792 if (Var->getStorageClass() == SC_PrivateExtern)
793 LV.mergeVisibility(HiddenVisibility, true);
794
795 // Note that Sema::MergeVarDecl already takes care of implementing
796 // C99 6.2.2p4 and propagating the visibility attribute, so we don't have
797 // to do it here.
798
799 // As per function and class template specializations (below),
800 // consider LV for the template and template arguments. We're at file
801 // scope, so we do not need to worry about nested specializations.
802 if (const auto *spec = dyn_cast<VarTemplateSpecializationDecl>(Var)) {
803 mergeTemplateLV(LV, spec, computation);
804 }
805
806 // - a function; or
807 } else if (const auto *Function = dyn_cast<FunctionDecl>(D)) {
808 // In theory, we can modify the function's LV by the LV of its
809 // type unless it has C linkage (see comment above about variables
810 // for justification). In practice, GCC doesn't do this, so it's
811 // just too painful to make work.
812
813 if (Function->getStorageClass() == SC_PrivateExtern)
814 LV.mergeVisibility(HiddenVisibility, true);
815
816 // Note that Sema::MergeCompatibleFunctionDecls already takes care of
817 // merging storage classes and visibility attributes, so we don't have to
818 // look at previous decls in here.
819
820 // In C++, then if the type of the function uses a type with
821 // unique-external linkage, it's not legally usable from outside
822 // this translation unit. However, we should use the C linkage
823 // rules instead for extern "C" declarations.
824 if (Context.getLangOpts().CPlusPlus && !isFirstInExternCContext(Function)) {
825 // Only look at the type-as-written. Otherwise, deducing the return type
826 // of a function could change its linkage.
827 QualType TypeAsWritten = Function->getType();
828 if (TypeSourceInfo *TSI = Function->getTypeSourceInfo())
829 TypeAsWritten = TSI->getType();
830 if (!isExternallyVisible(TypeAsWritten->getLinkage()))
831 return LinkageInfo::uniqueExternal();
832 }
833
834 // Consider LV from the template and the template arguments.
835 // We're at file scope, so we do not need to worry about nested
836 // specializations.
837 if (FunctionTemplateSpecializationInfo *specInfo
838 = Function->getTemplateSpecializationInfo()) {
839 mergeTemplateLV(LV, Function, specInfo, computation);
840 }
841
842 // - a named class (Clause 9), or an unnamed class defined in a
843 // typedef declaration in which the class has the typedef name
844 // for linkage purposes (7.1.3); or
845 // - a named enumeration (7.2), or an unnamed enumeration
846 // defined in a typedef declaration in which the enumeration
847 // has the typedef name for linkage purposes (7.1.3); or
848 } else if (const auto *Tag = dyn_cast<TagDecl>(D)) {
849 // Unnamed tags have no linkage.
850 if (!Tag->hasNameForLinkage())
851 return LinkageInfo::none();
852
853 // If this is a class template specialization, consider the
854 // linkage of the template and template arguments. We're at file
855 // scope, so we do not need to worry about nested specializations.
856 if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(Tag)) {
857 mergeTemplateLV(LV, spec, computation);
858 }
859
860 // FIXME: This is not part of the C++ standard any more.
861 // - an enumerator belonging to an enumeration with external linkage; or
862 } else if (isa<EnumConstantDecl>(D)) {
863 LinkageInfo EnumLV = getLVForDecl(cast<NamedDecl>(D->getDeclContext()),
864 computation);
865 if (!isExternalFormalLinkage(EnumLV.getLinkage()))
866 return LinkageInfo::none();
867 LV.merge(EnumLV);
868
869 // - a template
870 } else if (const auto *temp = dyn_cast<TemplateDecl>(D)) {
871 bool considerVisibility = !hasExplicitVisibilityAlready(computation);
872 LinkageInfo tempLV =
873 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
874 LV.mergeMaybeWithVisibility(tempLV, considerVisibility);
875
876 // An unnamed namespace or a namespace declared directly or indirectly
877 // within an unnamed namespace has internal linkage. All other namespaces
878 // have external linkage.
879 //
880 // We handled names in anonymous namespaces above.
881 } else if (isa<NamespaceDecl>(D)) {
882 return LV;
883
884 // By extension, we assign external linkage to Objective-C
885 // interfaces.
886 } else if (isa<ObjCInterfaceDecl>(D)) {
887 // fallout
888
889 } else if (auto *TD = dyn_cast<TypedefNameDecl>(D)) {
890 // A typedef declaration has linkage if it gives a type a name for
891 // linkage purposes.
892 if (!TD->getAnonDeclWithTypedefName(/*AnyRedecl*/true))
893 return LinkageInfo::none();
894
895 } else if (isa<MSGuidDecl>(D)) {
896 // A GUID behaves like an inline variable with external linkage. Fall
897 // through.
898
899 // Everything not covered here has no linkage.
900 } else {
901 return LinkageInfo::none();
902 }
903
904 // If we ended up with non-externally-visible linkage, visibility should
905 // always be default.
906 if (!isExternallyVisible(LV.getLinkage()))
907 return LinkageInfo(LV.getLinkage(), DefaultVisibility, false);
908
909 // Mark the symbols as hidden when compiling for the device.
910 if (Context.getLangOpts().OpenMP && Context.getLangOpts().OpenMPIsDevice)
911 LV.mergeVisibility(HiddenVisibility, /*newExplicit=*/false);
912
913 return LV;
914 }
915
916 LinkageInfo
getLVForClassMember(const NamedDecl * D,LVComputationKind computation,bool IgnoreVarTypeLinkage)917 LinkageComputer::getLVForClassMember(const NamedDecl *D,
918 LVComputationKind computation,
919 bool IgnoreVarTypeLinkage) {
920 // Only certain class members have linkage. Note that fields don't
921 // really have linkage, but it's convenient to say they do for the
922 // purposes of calculating linkage of pointer-to-data-member
923 // template arguments.
924 //
925 // Templates also don't officially have linkage, but since we ignore
926 // the C++ standard and look at template arguments when determining
927 // linkage and visibility of a template specialization, we might hit
928 // a template template argument that way. If we do, we need to
929 // consider its linkage.
930 if (!(isa<CXXMethodDecl>(D) ||
931 isa<VarDecl>(D) ||
932 isa<FieldDecl>(D) ||
933 isa<IndirectFieldDecl>(D) ||
934 isa<TagDecl>(D) ||
935 isa<TemplateDecl>(D)))
936 return LinkageInfo::none();
937
938 LinkageInfo LV;
939
940 // If we have an explicit visibility attribute, merge that in.
941 if (!hasExplicitVisibilityAlready(computation)) {
942 if (Optional<Visibility> Vis = getExplicitVisibility(D, computation))
943 LV.mergeVisibility(*Vis, true);
944 // If we're paying attention to global visibility, apply
945 // -finline-visibility-hidden if this is an inline method.
946 //
947 // Note that we do this before merging information about
948 // the class visibility.
949 if (!LV.isVisibilityExplicit() && useInlineVisibilityHidden(D))
950 LV.mergeVisibility(HiddenVisibility, /*visibilityExplicit=*/false);
951 }
952
953 // If this class member has an explicit visibility attribute, the only
954 // thing that can change its visibility is the template arguments, so
955 // only look for them when processing the class.
956 LVComputationKind classComputation = computation;
957 if (LV.isVisibilityExplicit())
958 classComputation = withExplicitVisibilityAlready(computation);
959
960 LinkageInfo classLV =
961 getLVForDecl(cast<RecordDecl>(D->getDeclContext()), classComputation);
962 // The member has the same linkage as the class. If that's not externally
963 // visible, we don't need to compute anything about the linkage.
964 // FIXME: If we're only computing linkage, can we bail out here?
965 if (!isExternallyVisible(classLV.getLinkage()))
966 return classLV;
967
968
969 // Otherwise, don't merge in classLV yet, because in certain cases
970 // we need to completely ignore the visibility from it.
971
972 // Specifically, if this decl exists and has an explicit attribute.
973 const NamedDecl *explicitSpecSuppressor = nullptr;
974
975 if (const auto *MD = dyn_cast<CXXMethodDecl>(D)) {
976 // Only look at the type-as-written. Otherwise, deducing the return type
977 // of a function could change its linkage.
978 QualType TypeAsWritten = MD->getType();
979 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo())
980 TypeAsWritten = TSI->getType();
981 if (!isExternallyVisible(TypeAsWritten->getLinkage()))
982 return LinkageInfo::uniqueExternal();
983
984 // If this is a method template specialization, use the linkage for
985 // the template parameters and arguments.
986 if (FunctionTemplateSpecializationInfo *spec
987 = MD->getTemplateSpecializationInfo()) {
988 mergeTemplateLV(LV, MD, spec, computation);
989 if (spec->isExplicitSpecialization()) {
990 explicitSpecSuppressor = MD;
991 } else if (isExplicitMemberSpecialization(spec->getTemplate())) {
992 explicitSpecSuppressor = spec->getTemplate()->getTemplatedDecl();
993 }
994 } else if (isExplicitMemberSpecialization(MD)) {
995 explicitSpecSuppressor = MD;
996 }
997
998 } else if (const auto *RD = dyn_cast<CXXRecordDecl>(D)) {
999 if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(RD)) {
1000 mergeTemplateLV(LV, spec, computation);
1001 if (spec->isExplicitSpecialization()) {
1002 explicitSpecSuppressor = spec;
1003 } else {
1004 const ClassTemplateDecl *temp = spec->getSpecializedTemplate();
1005 if (isExplicitMemberSpecialization(temp)) {
1006 explicitSpecSuppressor = temp->getTemplatedDecl();
1007 }
1008 }
1009 } else if (isExplicitMemberSpecialization(RD)) {
1010 explicitSpecSuppressor = RD;
1011 }
1012
1013 // Static data members.
1014 } else if (const auto *VD = dyn_cast<VarDecl>(D)) {
1015 if (const auto *spec = dyn_cast<VarTemplateSpecializationDecl>(VD))
1016 mergeTemplateLV(LV, spec, computation);
1017
1018 // Modify the variable's linkage by its type, but ignore the
1019 // type's visibility unless it's a definition.
1020 if (!IgnoreVarTypeLinkage) {
1021 LinkageInfo typeLV = getLVForType(*VD->getType(), computation);
1022 // FIXME: If the type's linkage is not externally visible, we can
1023 // give this static data member UniqueExternalLinkage.
1024 if (!LV.isVisibilityExplicit() && !classLV.isVisibilityExplicit())
1025 LV.mergeVisibility(typeLV);
1026 LV.mergeExternalVisibility(typeLV);
1027 }
1028
1029 if (isExplicitMemberSpecialization(VD)) {
1030 explicitSpecSuppressor = VD;
1031 }
1032
1033 // Template members.
1034 } else if (const auto *temp = dyn_cast<TemplateDecl>(D)) {
1035 bool considerVisibility =
1036 (!LV.isVisibilityExplicit() &&
1037 !classLV.isVisibilityExplicit() &&
1038 !hasExplicitVisibilityAlready(computation));
1039 LinkageInfo tempLV =
1040 getLVForTemplateParameterList(temp->getTemplateParameters(), computation);
1041 LV.mergeMaybeWithVisibility(tempLV, considerVisibility);
1042
1043 if (const auto *redeclTemp = dyn_cast<RedeclarableTemplateDecl>(temp)) {
1044 if (isExplicitMemberSpecialization(redeclTemp)) {
1045 explicitSpecSuppressor = temp->getTemplatedDecl();
1046 }
1047 }
1048 }
1049
1050 // We should never be looking for an attribute directly on a template.
1051 assert(!explicitSpecSuppressor || !isa<TemplateDecl>(explicitSpecSuppressor));
1052
1053 // If this member is an explicit member specialization, and it has
1054 // an explicit attribute, ignore visibility from the parent.
1055 bool considerClassVisibility = true;
1056 if (explicitSpecSuppressor &&
1057 // optimization: hasDVA() is true only with explicit visibility.
1058 LV.isVisibilityExplicit() &&
1059 classLV.getVisibility() != DefaultVisibility &&
1060 hasDirectVisibilityAttribute(explicitSpecSuppressor, computation)) {
1061 considerClassVisibility = false;
1062 }
1063
1064 // Finally, merge in information from the class.
1065 LV.mergeMaybeWithVisibility(classLV, considerClassVisibility);
1066 return LV;
1067 }
1068
anchor()1069 void NamedDecl::anchor() {}
1070
isLinkageValid() const1071 bool NamedDecl::isLinkageValid() const {
1072 if (!hasCachedLinkage())
1073 return true;
1074
1075 Linkage L = LinkageComputer{}
1076 .computeLVForDecl(this, LVComputationKind::forLinkageOnly())
1077 .getLinkage();
1078 return L == getCachedLinkage();
1079 }
1080
getObjCFStringFormattingFamily() const1081 ObjCStringFormatFamily NamedDecl::getObjCFStringFormattingFamily() const {
1082 StringRef name = getName();
1083 if (name.empty()) return SFF_None;
1084
1085 if (name.front() == 'C')
1086 if (name == "CFStringCreateWithFormat" ||
1087 name == "CFStringCreateWithFormatAndArguments" ||
1088 name == "CFStringAppendFormat" ||
1089 name == "CFStringAppendFormatAndArguments")
1090 return SFF_CFString;
1091 return SFF_None;
1092 }
1093
getLinkageInternal() const1094 Linkage NamedDecl::getLinkageInternal() const {
1095 // We don't care about visibility here, so ask for the cheapest
1096 // possible visibility analysis.
1097 return LinkageComputer{}
1098 .getLVForDecl(this, LVComputationKind::forLinkageOnly())
1099 .getLinkage();
1100 }
1101
getLinkageAndVisibility() const1102 LinkageInfo NamedDecl::getLinkageAndVisibility() const {
1103 return LinkageComputer{}.getDeclLinkageAndVisibility(this);
1104 }
1105
1106 static Optional<Visibility>
getExplicitVisibilityAux(const NamedDecl * ND,NamedDecl::ExplicitVisibilityKind kind,bool IsMostRecent)1107 getExplicitVisibilityAux(const NamedDecl *ND,
1108 NamedDecl::ExplicitVisibilityKind kind,
1109 bool IsMostRecent) {
1110 assert(!IsMostRecent || ND == ND->getMostRecentDecl());
1111
1112 // Check the declaration itself first.
1113 if (Optional<Visibility> V = getVisibilityOf(ND, kind))
1114 return V;
1115
1116 // If this is a member class of a specialization of a class template
1117 // and the corresponding decl has explicit visibility, use that.
1118 if (const auto *RD = dyn_cast<CXXRecordDecl>(ND)) {
1119 CXXRecordDecl *InstantiatedFrom = RD->getInstantiatedFromMemberClass();
1120 if (InstantiatedFrom)
1121 return getVisibilityOf(InstantiatedFrom, kind);
1122 }
1123
1124 // If there wasn't explicit visibility there, and this is a
1125 // specialization of a class template, check for visibility
1126 // on the pattern.
1127 if (const auto *spec = dyn_cast<ClassTemplateSpecializationDecl>(ND)) {
1128 // Walk all the template decl till this point to see if there are
1129 // explicit visibility attributes.
1130 const auto *TD = spec->getSpecializedTemplate()->getTemplatedDecl();
1131 while (TD != nullptr) {
1132 auto Vis = getVisibilityOf(TD, kind);
1133 if (Vis != None)
1134 return Vis;
1135 TD = TD->getPreviousDecl();
1136 }
1137 return None;
1138 }
1139
1140 // Use the most recent declaration.
1141 if (!IsMostRecent && !isa<NamespaceDecl>(ND)) {
1142 const NamedDecl *MostRecent = ND->getMostRecentDecl();
1143 if (MostRecent != ND)
1144 return getExplicitVisibilityAux(MostRecent, kind, true);
1145 }
1146
1147 if (const auto *Var = dyn_cast<VarDecl>(ND)) {
1148 if (Var->isStaticDataMember()) {
1149 VarDecl *InstantiatedFrom = Var->getInstantiatedFromStaticDataMember();
1150 if (InstantiatedFrom)
1151 return getVisibilityOf(InstantiatedFrom, kind);
1152 }
1153
1154 if (const auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(Var))
1155 return getVisibilityOf(VTSD->getSpecializedTemplate()->getTemplatedDecl(),
1156 kind);
1157
1158 return None;
1159 }
1160 // Also handle function template specializations.
1161 if (const auto *fn = dyn_cast<FunctionDecl>(ND)) {
1162 // If the function is a specialization of a template with an
1163 // explicit visibility attribute, use that.
1164 if (FunctionTemplateSpecializationInfo *templateInfo
1165 = fn->getTemplateSpecializationInfo())
1166 return getVisibilityOf(templateInfo->getTemplate()->getTemplatedDecl(),
1167 kind);
1168
1169 // If the function is a member of a specialization of a class template
1170 // and the corresponding decl has explicit visibility, use that.
1171 FunctionDecl *InstantiatedFrom = fn->getInstantiatedFromMemberFunction();
1172 if (InstantiatedFrom)
1173 return getVisibilityOf(InstantiatedFrom, kind);
1174
1175 return None;
1176 }
1177
1178 // The visibility of a template is stored in the templated decl.
1179 if (const auto *TD = dyn_cast<TemplateDecl>(ND))
1180 return getVisibilityOf(TD->getTemplatedDecl(), kind);
1181
1182 return None;
1183 }
1184
1185 Optional<Visibility>
getExplicitVisibility(ExplicitVisibilityKind kind) const1186 NamedDecl::getExplicitVisibility(ExplicitVisibilityKind kind) const {
1187 return getExplicitVisibilityAux(this, kind, false);
1188 }
1189
getLVForClosure(const DeclContext * DC,Decl * ContextDecl,LVComputationKind computation)1190 LinkageInfo LinkageComputer::getLVForClosure(const DeclContext *DC,
1191 Decl *ContextDecl,
1192 LVComputationKind computation) {
1193 // This lambda has its linkage/visibility determined by its owner.
1194 const NamedDecl *Owner;
1195 if (!ContextDecl)
1196 Owner = dyn_cast<NamedDecl>(DC);
1197 else if (isa<ParmVarDecl>(ContextDecl))
1198 Owner =
1199 dyn_cast<NamedDecl>(ContextDecl->getDeclContext()->getRedeclContext());
1200 else
1201 Owner = cast<NamedDecl>(ContextDecl);
1202
1203 if (!Owner)
1204 return LinkageInfo::none();
1205
1206 // If the owner has a deduced type, we need to skip querying the linkage and
1207 // visibility of that type, because it might involve this closure type. The
1208 // only effect of this is that we might give a lambda VisibleNoLinkage rather
1209 // than NoLinkage when we don't strictly need to, which is benign.
1210 auto *VD = dyn_cast<VarDecl>(Owner);
1211 LinkageInfo OwnerLV =
1212 VD && VD->getType()->getContainedDeducedType()
1213 ? computeLVForDecl(Owner, computation, /*IgnoreVarTypeLinkage*/true)
1214 : getLVForDecl(Owner, computation);
1215
1216 // A lambda never formally has linkage. But if the owner is externally
1217 // visible, then the lambda is too. We apply the same rules to blocks.
1218 if (!isExternallyVisible(OwnerLV.getLinkage()))
1219 return LinkageInfo::none();
1220 return LinkageInfo(VisibleNoLinkage, OwnerLV.getVisibility(),
1221 OwnerLV.isVisibilityExplicit());
1222 }
1223
getLVForLocalDecl(const NamedDecl * D,LVComputationKind computation)1224 LinkageInfo LinkageComputer::getLVForLocalDecl(const NamedDecl *D,
1225 LVComputationKind computation) {
1226 if (const auto *Function = dyn_cast<FunctionDecl>(D)) {
1227 if (Function->isInAnonymousNamespace() &&
1228 !isFirstInExternCContext(Function))
1229 return getInternalLinkageFor(Function);
1230
1231 // This is a "void f();" which got merged with a file static.
1232 if (Function->getCanonicalDecl()->getStorageClass() == SC_Static)
1233 return getInternalLinkageFor(Function);
1234
1235 LinkageInfo LV;
1236 if (!hasExplicitVisibilityAlready(computation)) {
1237 if (Optional<Visibility> Vis =
1238 getExplicitVisibility(Function, computation))
1239 LV.mergeVisibility(*Vis, true);
1240 }
1241
1242 // Note that Sema::MergeCompatibleFunctionDecls already takes care of
1243 // merging storage classes and visibility attributes, so we don't have to
1244 // look at previous decls in here.
1245
1246 return LV;
1247 }
1248
1249 if (const auto *Var = dyn_cast<VarDecl>(D)) {
1250 if (Var->hasExternalStorage()) {
1251 if (Var->isInAnonymousNamespace() && !isFirstInExternCContext(Var))
1252 return getInternalLinkageFor(Var);
1253
1254 LinkageInfo LV;
1255 if (Var->getStorageClass() == SC_PrivateExtern)
1256 LV.mergeVisibility(HiddenVisibility, true);
1257 else if (!hasExplicitVisibilityAlready(computation)) {
1258 if (Optional<Visibility> Vis = getExplicitVisibility(Var, computation))
1259 LV.mergeVisibility(*Vis, true);
1260 }
1261
1262 if (const VarDecl *Prev = Var->getPreviousDecl()) {
1263 LinkageInfo PrevLV = getLVForDecl(Prev, computation);
1264 if (PrevLV.getLinkage())
1265 LV.setLinkage(PrevLV.getLinkage());
1266 LV.mergeVisibility(PrevLV);
1267 }
1268
1269 return LV;
1270 }
1271
1272 if (!Var->isStaticLocal())
1273 return LinkageInfo::none();
1274 }
1275
1276 ASTContext &Context = D->getASTContext();
1277 if (!Context.getLangOpts().CPlusPlus)
1278 return LinkageInfo::none();
1279
1280 const Decl *OuterD = getOutermostFuncOrBlockContext(D);
1281 if (!OuterD || OuterD->isInvalidDecl())
1282 return LinkageInfo::none();
1283
1284 LinkageInfo LV;
1285 if (const auto *BD = dyn_cast<BlockDecl>(OuterD)) {
1286 if (!BD->getBlockManglingNumber())
1287 return LinkageInfo::none();
1288
1289 LV = getLVForClosure(BD->getDeclContext()->getRedeclContext(),
1290 BD->getBlockManglingContextDecl(), computation);
1291 } else {
1292 const auto *FD = cast<FunctionDecl>(OuterD);
1293 if (!FD->isInlined() &&
1294 !isTemplateInstantiation(FD->getTemplateSpecializationKind()))
1295 return LinkageInfo::none();
1296
1297 // If a function is hidden by -fvisibility-inlines-hidden option and
1298 // is not explicitly attributed as a hidden function,
1299 // we should not make static local variables in the function hidden.
1300 LV = getLVForDecl(FD, computation);
1301 if (isa<VarDecl>(D) && useInlineVisibilityHidden(FD) &&
1302 !LV.isVisibilityExplicit() &&
1303 !Context.getLangOpts().VisibilityInlinesHiddenStaticLocalVar) {
1304 assert(cast<VarDecl>(D)->isStaticLocal());
1305 // If this was an implicitly hidden inline method, check again for
1306 // explicit visibility on the parent class, and use that for static locals
1307 // if present.
1308 if (const auto *MD = dyn_cast<CXXMethodDecl>(FD))
1309 LV = getLVForDecl(MD->getParent(), computation);
1310 if (!LV.isVisibilityExplicit()) {
1311 Visibility globalVisibility =
1312 computation.isValueVisibility()
1313 ? Context.getLangOpts().getValueVisibilityMode()
1314 : Context.getLangOpts().getTypeVisibilityMode();
1315 return LinkageInfo(VisibleNoLinkage, globalVisibility,
1316 /*visibilityExplicit=*/false);
1317 }
1318 }
1319 }
1320 if (!isExternallyVisible(LV.getLinkage()))
1321 return LinkageInfo::none();
1322 return LinkageInfo(VisibleNoLinkage, LV.getVisibility(),
1323 LV.isVisibilityExplicit());
1324 }
1325
computeLVForDecl(const NamedDecl * D,LVComputationKind computation,bool IgnoreVarTypeLinkage)1326 LinkageInfo LinkageComputer::computeLVForDecl(const NamedDecl *D,
1327 LVComputationKind computation,
1328 bool IgnoreVarTypeLinkage) {
1329 // Internal_linkage attribute overrides other considerations.
1330 if (D->hasAttr<InternalLinkageAttr>())
1331 return getInternalLinkageFor(D);
1332
1333 // Objective-C: treat all Objective-C declarations as having external
1334 // linkage.
1335 switch (D->getKind()) {
1336 default:
1337 break;
1338
1339 // Per C++ [basic.link]p2, only the names of objects, references,
1340 // functions, types, templates, namespaces, and values ever have linkage.
1341 //
1342 // Note that the name of a typedef, namespace alias, using declaration,
1343 // and so on are not the name of the corresponding type, namespace, or
1344 // declaration, so they do *not* have linkage.
1345 case Decl::ImplicitParam:
1346 case Decl::Label:
1347 case Decl::NamespaceAlias:
1348 case Decl::ParmVar:
1349 case Decl::Using:
1350 case Decl::UsingShadow:
1351 case Decl::UsingDirective:
1352 return LinkageInfo::none();
1353
1354 case Decl::EnumConstant:
1355 // C++ [basic.link]p4: an enumerator has the linkage of its enumeration.
1356 if (D->getASTContext().getLangOpts().CPlusPlus)
1357 return getLVForDecl(cast<EnumDecl>(D->getDeclContext()), computation);
1358 return LinkageInfo::visible_none();
1359
1360 case Decl::Typedef:
1361 case Decl::TypeAlias:
1362 // A typedef declaration has linkage if it gives a type a name for
1363 // linkage purposes.
1364 if (!cast<TypedefNameDecl>(D)
1365 ->getAnonDeclWithTypedefName(/*AnyRedecl*/true))
1366 return LinkageInfo::none();
1367 break;
1368
1369 case Decl::TemplateTemplateParm: // count these as external
1370 case Decl::NonTypeTemplateParm:
1371 case Decl::ObjCAtDefsField:
1372 case Decl::ObjCCategory:
1373 case Decl::ObjCCategoryImpl:
1374 case Decl::ObjCCompatibleAlias:
1375 case Decl::ObjCImplementation:
1376 case Decl::ObjCMethod:
1377 case Decl::ObjCProperty:
1378 case Decl::ObjCPropertyImpl:
1379 case Decl::ObjCProtocol:
1380 return getExternalLinkageFor(D);
1381
1382 case Decl::CXXRecord: {
1383 const auto *Record = cast<CXXRecordDecl>(D);
1384 if (Record->isLambda()) {
1385 if (Record->hasKnownLambdaInternalLinkage() ||
1386 !Record->getLambdaManglingNumber()) {
1387 // This lambda has no mangling number, so it's internal.
1388 return getInternalLinkageFor(D);
1389 }
1390
1391 return getLVForClosure(
1392 Record->getDeclContext()->getRedeclContext(),
1393 Record->getLambdaContextDecl(), computation);
1394 }
1395
1396 break;
1397 }
1398
1399 case Decl::TemplateParamObject: {
1400 // The template parameter object can be referenced from anywhere its type
1401 // and value can be referenced.
1402 auto *TPO = cast<TemplateParamObjectDecl>(D);
1403 LinkageInfo LV = getLVForType(*TPO->getType(), computation);
1404 LV.merge(getLVForValue(TPO->getValue(), computation));
1405 return LV;
1406 }
1407 }
1408
1409 // Handle linkage for namespace-scope names.
1410 if (D->getDeclContext()->getRedeclContext()->isFileContext())
1411 return getLVForNamespaceScopeDecl(D, computation, IgnoreVarTypeLinkage);
1412
1413 // C++ [basic.link]p5:
1414 // In addition, a member function, static data member, a named
1415 // class or enumeration of class scope, or an unnamed class or
1416 // enumeration defined in a class-scope typedef declaration such
1417 // that the class or enumeration has the typedef name for linkage
1418 // purposes (7.1.3), has external linkage if the name of the class
1419 // has external linkage.
1420 if (D->getDeclContext()->isRecord())
1421 return getLVForClassMember(D, computation, IgnoreVarTypeLinkage);
1422
1423 // C++ [basic.link]p6:
1424 // The name of a function declared in block scope and the name of
1425 // an object declared by a block scope extern declaration have
1426 // linkage. If there is a visible declaration of an entity with
1427 // linkage having the same name and type, ignoring entities
1428 // declared outside the innermost enclosing namespace scope, the
1429 // block scope declaration declares that same entity and receives
1430 // the linkage of the previous declaration. If there is more than
1431 // one such matching entity, the program is ill-formed. Otherwise,
1432 // if no matching entity is found, the block scope entity receives
1433 // external linkage.
1434 if (D->getDeclContext()->isFunctionOrMethod())
1435 return getLVForLocalDecl(D, computation);
1436
1437 // C++ [basic.link]p6:
1438 // Names not covered by these rules have no linkage.
1439 return LinkageInfo::none();
1440 }
1441
1442 /// getLVForDecl - Get the linkage and visibility for the given declaration.
getLVForDecl(const NamedDecl * D,LVComputationKind computation)1443 LinkageInfo LinkageComputer::getLVForDecl(const NamedDecl *D,
1444 LVComputationKind computation) {
1445 // Internal_linkage attribute overrides other considerations.
1446 if (D->hasAttr<InternalLinkageAttr>())
1447 return getInternalLinkageFor(D);
1448
1449 if (computation.IgnoreAllVisibility && D->hasCachedLinkage())
1450 return LinkageInfo(D->getCachedLinkage(), DefaultVisibility, false);
1451
1452 if (llvm::Optional<LinkageInfo> LI = lookup(D, computation))
1453 return *LI;
1454
1455 LinkageInfo LV = computeLVForDecl(D, computation);
1456 if (D->hasCachedLinkage())
1457 assert(D->getCachedLinkage() == LV.getLinkage());
1458
1459 D->setCachedLinkage(LV.getLinkage());
1460 cache(D, computation, LV);
1461
1462 #ifndef NDEBUG
1463 // In C (because of gnu inline) and in c++ with microsoft extensions an
1464 // static can follow an extern, so we can have two decls with different
1465 // linkages.
1466 const LangOptions &Opts = D->getASTContext().getLangOpts();
1467 if (!Opts.CPlusPlus || Opts.MicrosoftExt)
1468 return LV;
1469
1470 // We have just computed the linkage for this decl. By induction we know
1471 // that all other computed linkages match, check that the one we just
1472 // computed also does.
1473 NamedDecl *Old = nullptr;
1474 for (auto I : D->redecls()) {
1475 auto *T = cast<NamedDecl>(I);
1476 if (T == D)
1477 continue;
1478 if (!T->isInvalidDecl() && T->hasCachedLinkage()) {
1479 Old = T;
1480 break;
1481 }
1482 }
1483 assert(!Old || Old->getCachedLinkage() == D->getCachedLinkage());
1484 #endif
1485
1486 return LV;
1487 }
1488
getDeclLinkageAndVisibility(const NamedDecl * D)1489 LinkageInfo LinkageComputer::getDeclLinkageAndVisibility(const NamedDecl *D) {
1490 return getLVForDecl(D,
1491 LVComputationKind(usesTypeVisibility(D)
1492 ? NamedDecl::VisibilityForType
1493 : NamedDecl::VisibilityForValue));
1494 }
1495
getOwningModuleForLinkage(bool IgnoreLinkage) const1496 Module *Decl::getOwningModuleForLinkage(bool IgnoreLinkage) const {
1497 Module *M = getOwningModule();
1498 if (!M)
1499 return nullptr;
1500
1501 switch (M->Kind) {
1502 case Module::ModuleMapModule:
1503 // Module map modules have no special linkage semantics.
1504 return nullptr;
1505
1506 case Module::ModuleInterfaceUnit:
1507 return M;
1508
1509 case Module::GlobalModuleFragment: {
1510 // External linkage declarations in the global module have no owning module
1511 // for linkage purposes. But internal linkage declarations in the global
1512 // module fragment of a particular module are owned by that module for
1513 // linkage purposes.
1514 if (IgnoreLinkage)
1515 return nullptr;
1516 bool InternalLinkage;
1517 if (auto *ND = dyn_cast<NamedDecl>(this))
1518 InternalLinkage = !ND->hasExternalFormalLinkage();
1519 else {
1520 auto *NSD = dyn_cast<NamespaceDecl>(this);
1521 InternalLinkage = (NSD && NSD->isAnonymousNamespace()) ||
1522 isInAnonymousNamespace();
1523 }
1524 return InternalLinkage ? M->Parent : nullptr;
1525 }
1526
1527 case Module::PrivateModuleFragment:
1528 // The private module fragment is part of its containing module for linkage
1529 // purposes.
1530 return M->Parent;
1531 }
1532
1533 llvm_unreachable("unknown module kind");
1534 }
1535
printName(raw_ostream & os) const1536 void NamedDecl::printName(raw_ostream &os) const {
1537 os << Name;
1538 }
1539
getQualifiedNameAsString() const1540 std::string NamedDecl::getQualifiedNameAsString() const {
1541 std::string QualName;
1542 llvm::raw_string_ostream OS(QualName);
1543 printQualifiedName(OS, getASTContext().getPrintingPolicy());
1544 return OS.str();
1545 }
1546
printQualifiedName(raw_ostream & OS) const1547 void NamedDecl::printQualifiedName(raw_ostream &OS) const {
1548 printQualifiedName(OS, getASTContext().getPrintingPolicy());
1549 }
1550
printQualifiedName(raw_ostream & OS,const PrintingPolicy & P) const1551 void NamedDecl::printQualifiedName(raw_ostream &OS,
1552 const PrintingPolicy &P) const {
1553 if (getDeclContext()->isFunctionOrMethod()) {
1554 // We do not print '(anonymous)' for function parameters without name.
1555 printName(OS);
1556 return;
1557 }
1558 printNestedNameSpecifier(OS, P);
1559 if (getDeclName())
1560 OS << *this;
1561 else {
1562 // Give the printName override a chance to pick a different name before we
1563 // fall back to "(anonymous)".
1564 SmallString<64> NameBuffer;
1565 llvm::raw_svector_ostream NameOS(NameBuffer);
1566 printName(NameOS);
1567 if (NameBuffer.empty())
1568 OS << "(anonymous)";
1569 else
1570 OS << NameBuffer;
1571 }
1572 }
1573
printNestedNameSpecifier(raw_ostream & OS) const1574 void NamedDecl::printNestedNameSpecifier(raw_ostream &OS) const {
1575 printNestedNameSpecifier(OS, getASTContext().getPrintingPolicy());
1576 }
1577
printNestedNameSpecifier(raw_ostream & OS,const PrintingPolicy & P) const1578 void NamedDecl::printNestedNameSpecifier(raw_ostream &OS,
1579 const PrintingPolicy &P) const {
1580 const DeclContext *Ctx = getDeclContext();
1581
1582 // For ObjC methods and properties, look through categories and use the
1583 // interface as context.
1584 if (auto *MD = dyn_cast<ObjCMethodDecl>(this)) {
1585 if (auto *ID = MD->getClassInterface())
1586 Ctx = ID;
1587 } else if (auto *PD = dyn_cast<ObjCPropertyDecl>(this)) {
1588 if (auto *MD = PD->getGetterMethodDecl())
1589 if (auto *ID = MD->getClassInterface())
1590 Ctx = ID;
1591 } else if (auto *ID = dyn_cast<ObjCIvarDecl>(this)) {
1592 if (auto *CI = ID->getContainingInterface())
1593 Ctx = CI;
1594 }
1595
1596 if (Ctx->isFunctionOrMethod())
1597 return;
1598
1599 using ContextsTy = SmallVector<const DeclContext *, 8>;
1600 ContextsTy Contexts;
1601
1602 // Collect named contexts.
1603 DeclarationName NameInScope = getDeclName();
1604 for (; Ctx; Ctx = Ctx->getParent()) {
1605 // Suppress anonymous namespace if requested.
1606 if (P.SuppressUnwrittenScope && isa<NamespaceDecl>(Ctx) &&
1607 cast<NamespaceDecl>(Ctx)->isAnonymousNamespace())
1608 continue;
1609
1610 // Suppress inline namespace if it doesn't make the result ambiguous.
1611 if (P.SuppressInlineNamespace && Ctx->isInlineNamespace() && NameInScope &&
1612 Ctx->lookup(NameInScope).size() ==
1613 Ctx->getParent()->lookup(NameInScope).size())
1614 continue;
1615
1616 // Skip non-named contexts such as linkage specifications and ExportDecls.
1617 const NamedDecl *ND = dyn_cast<NamedDecl>(Ctx);
1618 if (!ND)
1619 continue;
1620
1621 Contexts.push_back(Ctx);
1622 NameInScope = ND->getDeclName();
1623 }
1624
1625 for (unsigned I = Contexts.size(); I != 0; --I) {
1626 const DeclContext *DC = Contexts[I - 1];
1627 if (const auto *Spec = dyn_cast<ClassTemplateSpecializationDecl>(DC)) {
1628 OS << Spec->getName();
1629 const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs();
1630 printTemplateArgumentList(
1631 OS, TemplateArgs.asArray(), P,
1632 Spec->getSpecializedTemplate()->getTemplateParameters());
1633 } else if (const auto *ND = dyn_cast<NamespaceDecl>(DC)) {
1634 if (ND->isAnonymousNamespace()) {
1635 OS << (P.MSVCFormatting ? "`anonymous namespace\'"
1636 : "(anonymous namespace)");
1637 }
1638 else
1639 OS << *ND;
1640 } else if (const auto *RD = dyn_cast<RecordDecl>(DC)) {
1641 if (!RD->getIdentifier())
1642 OS << "(anonymous " << RD->getKindName() << ')';
1643 else
1644 OS << *RD;
1645 } else if (const auto *FD = dyn_cast<FunctionDecl>(DC)) {
1646 const FunctionProtoType *FT = nullptr;
1647 if (FD->hasWrittenPrototype())
1648 FT = dyn_cast<FunctionProtoType>(FD->getType()->castAs<FunctionType>());
1649
1650 OS << *FD << '(';
1651 if (FT) {
1652 unsigned NumParams = FD->getNumParams();
1653 for (unsigned i = 0; i < NumParams; ++i) {
1654 if (i)
1655 OS << ", ";
1656 OS << FD->getParamDecl(i)->getType().stream(P);
1657 }
1658
1659 if (FT->isVariadic()) {
1660 if (NumParams > 0)
1661 OS << ", ";
1662 OS << "...";
1663 }
1664 }
1665 OS << ')';
1666 } else if (const auto *ED = dyn_cast<EnumDecl>(DC)) {
1667 // C++ [dcl.enum]p10: Each enum-name and each unscoped
1668 // enumerator is declared in the scope that immediately contains
1669 // the enum-specifier. Each scoped enumerator is declared in the
1670 // scope of the enumeration.
1671 // For the case of unscoped enumerator, do not include in the qualified
1672 // name any information about its enum enclosing scope, as its visibility
1673 // is global.
1674 if (ED->isScoped())
1675 OS << *ED;
1676 else
1677 continue;
1678 } else {
1679 OS << *cast<NamedDecl>(DC);
1680 }
1681 OS << "::";
1682 }
1683 }
1684
getNameForDiagnostic(raw_ostream & OS,const PrintingPolicy & Policy,bool Qualified) const1685 void NamedDecl::getNameForDiagnostic(raw_ostream &OS,
1686 const PrintingPolicy &Policy,
1687 bool Qualified) const {
1688 if (Qualified)
1689 printQualifiedName(OS, Policy);
1690 else
1691 printName(OS);
1692 }
1693
isRedeclarableImpl(Redeclarable<T> *)1694 template<typename T> static bool isRedeclarableImpl(Redeclarable<T> *) {
1695 return true;
1696 }
isRedeclarableImpl(...)1697 static bool isRedeclarableImpl(...) { return false; }
isRedeclarable(Decl::Kind K)1698 static bool isRedeclarable(Decl::Kind K) {
1699 switch (K) {
1700 #define DECL(Type, Base) \
1701 case Decl::Type: \
1702 return isRedeclarableImpl((Type##Decl *)nullptr);
1703 #define ABSTRACT_DECL(DECL)
1704 #include "clang/AST/DeclNodes.inc"
1705 }
1706 llvm_unreachable("unknown decl kind");
1707 }
1708
declarationReplaces(NamedDecl * OldD,bool IsKnownNewer) const1709 bool NamedDecl::declarationReplaces(NamedDecl *OldD, bool IsKnownNewer) const {
1710 assert(getDeclName() == OldD->getDeclName() && "Declaration name mismatch");
1711
1712 // Never replace one imported declaration with another; we need both results
1713 // when re-exporting.
1714 if (OldD->isFromASTFile() && isFromASTFile())
1715 return false;
1716
1717 // A kind mismatch implies that the declaration is not replaced.
1718 if (OldD->getKind() != getKind())
1719 return false;
1720
1721 // For method declarations, we never replace. (Why?)
1722 if (isa<ObjCMethodDecl>(this))
1723 return false;
1724
1725 // For parameters, pick the newer one. This is either an error or (in
1726 // Objective-C) permitted as an extension.
1727 if (isa<ParmVarDecl>(this))
1728 return true;
1729
1730 // Inline namespaces can give us two declarations with the same
1731 // name and kind in the same scope but different contexts; we should
1732 // keep both declarations in this case.
1733 if (!this->getDeclContext()->getRedeclContext()->Equals(
1734 OldD->getDeclContext()->getRedeclContext()))
1735 return false;
1736
1737 // Using declarations can be replaced if they import the same name from the
1738 // same context.
1739 if (auto *UD = dyn_cast<UsingDecl>(this)) {
1740 ASTContext &Context = getASTContext();
1741 return Context.getCanonicalNestedNameSpecifier(UD->getQualifier()) ==
1742 Context.getCanonicalNestedNameSpecifier(
1743 cast<UsingDecl>(OldD)->getQualifier());
1744 }
1745 if (auto *UUVD = dyn_cast<UnresolvedUsingValueDecl>(this)) {
1746 ASTContext &Context = getASTContext();
1747 return Context.getCanonicalNestedNameSpecifier(UUVD->getQualifier()) ==
1748 Context.getCanonicalNestedNameSpecifier(
1749 cast<UnresolvedUsingValueDecl>(OldD)->getQualifier());
1750 }
1751
1752 if (isRedeclarable(getKind())) {
1753 if (getCanonicalDecl() != OldD->getCanonicalDecl())
1754 return false;
1755
1756 if (IsKnownNewer)
1757 return true;
1758
1759 // Check whether this is actually newer than OldD. We want to keep the
1760 // newer declaration. This loop will usually only iterate once, because
1761 // OldD is usually the previous declaration.
1762 for (auto D : redecls()) {
1763 if (D == OldD)
1764 break;
1765
1766 // If we reach the canonical declaration, then OldD is not actually older
1767 // than this one.
1768 //
1769 // FIXME: In this case, we should not add this decl to the lookup table.
1770 if (D->isCanonicalDecl())
1771 return false;
1772 }
1773
1774 // It's a newer declaration of the same kind of declaration in the same
1775 // scope: we want this decl instead of the existing one.
1776 return true;
1777 }
1778
1779 // In all other cases, we need to keep both declarations in case they have
1780 // different visibility. Any attempt to use the name will result in an
1781 // ambiguity if more than one is visible.
1782 return false;
1783 }
1784
hasLinkage() const1785 bool NamedDecl::hasLinkage() const {
1786 return getFormalLinkage() != NoLinkage;
1787 }
1788
getUnderlyingDeclImpl()1789 NamedDecl *NamedDecl::getUnderlyingDeclImpl() {
1790 NamedDecl *ND = this;
1791 while (auto *UD = dyn_cast<UsingShadowDecl>(ND))
1792 ND = UD->getTargetDecl();
1793
1794 if (auto *AD = dyn_cast<ObjCCompatibleAliasDecl>(ND))
1795 return AD->getClassInterface();
1796
1797 if (auto *AD = dyn_cast<NamespaceAliasDecl>(ND))
1798 return AD->getNamespace();
1799
1800 return ND;
1801 }
1802
isCXXInstanceMember() const1803 bool NamedDecl::isCXXInstanceMember() const {
1804 if (!isCXXClassMember())
1805 return false;
1806
1807 const NamedDecl *D = this;
1808 if (isa<UsingShadowDecl>(D))
1809 D = cast<UsingShadowDecl>(D)->getTargetDecl();
1810
1811 if (isa<FieldDecl>(D) || isa<IndirectFieldDecl>(D) || isa<MSPropertyDecl>(D))
1812 return true;
1813 if (const auto *MD = dyn_cast_or_null<CXXMethodDecl>(D->getAsFunction()))
1814 return MD->isInstance();
1815 return false;
1816 }
1817
1818 //===----------------------------------------------------------------------===//
1819 // DeclaratorDecl Implementation
1820 //===----------------------------------------------------------------------===//
1821
1822 template <typename DeclT>
getTemplateOrInnerLocStart(const DeclT * decl)1823 static SourceLocation getTemplateOrInnerLocStart(const DeclT *decl) {
1824 if (decl->getNumTemplateParameterLists() > 0)
1825 return decl->getTemplateParameterList(0)->getTemplateLoc();
1826 return decl->getInnerLocStart();
1827 }
1828
getTypeSpecStartLoc() const1829 SourceLocation DeclaratorDecl::getTypeSpecStartLoc() const {
1830 TypeSourceInfo *TSI = getTypeSourceInfo();
1831 if (TSI) return TSI->getTypeLoc().getBeginLoc();
1832 return SourceLocation();
1833 }
1834
getTypeSpecEndLoc() const1835 SourceLocation DeclaratorDecl::getTypeSpecEndLoc() const {
1836 TypeSourceInfo *TSI = getTypeSourceInfo();
1837 if (TSI) return TSI->getTypeLoc().getEndLoc();
1838 return SourceLocation();
1839 }
1840
setQualifierInfo(NestedNameSpecifierLoc QualifierLoc)1841 void DeclaratorDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) {
1842 if (QualifierLoc) {
1843 // Make sure the extended decl info is allocated.
1844 if (!hasExtInfo()) {
1845 // Save (non-extended) type source info pointer.
1846 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
1847 // Allocate external info struct.
1848 DeclInfo = new (getASTContext()) ExtInfo;
1849 // Restore savedTInfo into (extended) decl info.
1850 getExtInfo()->TInfo = savedTInfo;
1851 }
1852 // Set qualifier info.
1853 getExtInfo()->QualifierLoc = QualifierLoc;
1854 } else if (hasExtInfo()) {
1855 // Here Qualifier == 0, i.e., we are removing the qualifier (if any).
1856 getExtInfo()->QualifierLoc = QualifierLoc;
1857 }
1858 }
1859
setTrailingRequiresClause(Expr * TrailingRequiresClause)1860 void DeclaratorDecl::setTrailingRequiresClause(Expr *TrailingRequiresClause) {
1861 assert(TrailingRequiresClause);
1862 // Make sure the extended decl info is allocated.
1863 if (!hasExtInfo()) {
1864 // Save (non-extended) type source info pointer.
1865 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
1866 // Allocate external info struct.
1867 DeclInfo = new (getASTContext()) ExtInfo;
1868 // Restore savedTInfo into (extended) decl info.
1869 getExtInfo()->TInfo = savedTInfo;
1870 }
1871 // Set requires clause info.
1872 getExtInfo()->TrailingRequiresClause = TrailingRequiresClause;
1873 }
1874
setTemplateParameterListsInfo(ASTContext & Context,ArrayRef<TemplateParameterList * > TPLists)1875 void DeclaratorDecl::setTemplateParameterListsInfo(
1876 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
1877 assert(!TPLists.empty());
1878 // Make sure the extended decl info is allocated.
1879 if (!hasExtInfo()) {
1880 // Save (non-extended) type source info pointer.
1881 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
1882 // Allocate external info struct.
1883 DeclInfo = new (getASTContext()) ExtInfo;
1884 // Restore savedTInfo into (extended) decl info.
1885 getExtInfo()->TInfo = savedTInfo;
1886 }
1887 // Set the template parameter lists info.
1888 getExtInfo()->setTemplateParameterListsInfo(Context, TPLists);
1889 }
1890
getOuterLocStart() const1891 SourceLocation DeclaratorDecl::getOuterLocStart() const {
1892 return getTemplateOrInnerLocStart(this);
1893 }
1894
1895 // Helper function: returns true if QT is or contains a type
1896 // having a postfix component.
typeIsPostfix(QualType QT)1897 static bool typeIsPostfix(QualType QT) {
1898 while (true) {
1899 const Type* T = QT.getTypePtr();
1900 switch (T->getTypeClass()) {
1901 default:
1902 return false;
1903 case Type::Pointer:
1904 QT = cast<PointerType>(T)->getPointeeType();
1905 break;
1906 case Type::BlockPointer:
1907 QT = cast<BlockPointerType>(T)->getPointeeType();
1908 break;
1909 case Type::MemberPointer:
1910 QT = cast<MemberPointerType>(T)->getPointeeType();
1911 break;
1912 case Type::LValueReference:
1913 case Type::RValueReference:
1914 QT = cast<ReferenceType>(T)->getPointeeType();
1915 break;
1916 case Type::PackExpansion:
1917 QT = cast<PackExpansionType>(T)->getPattern();
1918 break;
1919 case Type::Paren:
1920 case Type::ConstantArray:
1921 case Type::DependentSizedArray:
1922 case Type::IncompleteArray:
1923 case Type::VariableArray:
1924 case Type::FunctionProto:
1925 case Type::FunctionNoProto:
1926 return true;
1927 }
1928 }
1929 }
1930
getSourceRange() const1931 SourceRange DeclaratorDecl::getSourceRange() const {
1932 SourceLocation RangeEnd = getLocation();
1933 if (TypeSourceInfo *TInfo = getTypeSourceInfo()) {
1934 // If the declaration has no name or the type extends past the name take the
1935 // end location of the type.
1936 if (!getDeclName() || typeIsPostfix(TInfo->getType()))
1937 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
1938 }
1939 return SourceRange(getOuterLocStart(), RangeEnd);
1940 }
1941
setTemplateParameterListsInfo(ASTContext & Context,ArrayRef<TemplateParameterList * > TPLists)1942 void QualifierInfo::setTemplateParameterListsInfo(
1943 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
1944 // Free previous template parameters (if any).
1945 if (NumTemplParamLists > 0) {
1946 Context.Deallocate(TemplParamLists);
1947 TemplParamLists = nullptr;
1948 NumTemplParamLists = 0;
1949 }
1950 // Set info on matched template parameter lists (if any).
1951 if (!TPLists.empty()) {
1952 TemplParamLists = new (Context) TemplateParameterList *[TPLists.size()];
1953 NumTemplParamLists = TPLists.size();
1954 std::copy(TPLists.begin(), TPLists.end(), TemplParamLists);
1955 }
1956 }
1957
1958 //===----------------------------------------------------------------------===//
1959 // VarDecl Implementation
1960 //===----------------------------------------------------------------------===//
1961
getStorageClassSpecifierString(StorageClass SC)1962 const char *VarDecl::getStorageClassSpecifierString(StorageClass SC) {
1963 switch (SC) {
1964 case SC_None: break;
1965 case SC_Auto: return "auto";
1966 case SC_Extern: return "extern";
1967 case SC_PrivateExtern: return "__private_extern__";
1968 case SC_Register: return "register";
1969 case SC_Static: return "static";
1970 }
1971
1972 llvm_unreachable("Invalid storage class");
1973 }
1974
VarDecl(Kind DK,ASTContext & C,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,IdentifierInfo * Id,QualType T,TypeSourceInfo * TInfo,StorageClass SC)1975 VarDecl::VarDecl(Kind DK, ASTContext &C, DeclContext *DC,
1976 SourceLocation StartLoc, SourceLocation IdLoc,
1977 IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo,
1978 StorageClass SC)
1979 : DeclaratorDecl(DK, DC, IdLoc, Id, T, TInfo, StartLoc),
1980 redeclarable_base(C) {
1981 static_assert(sizeof(VarDeclBitfields) <= sizeof(unsigned),
1982 "VarDeclBitfields too large!");
1983 static_assert(sizeof(ParmVarDeclBitfields) <= sizeof(unsigned),
1984 "ParmVarDeclBitfields too large!");
1985 static_assert(sizeof(NonParmVarDeclBitfields) <= sizeof(unsigned),
1986 "NonParmVarDeclBitfields too large!");
1987 AllBits = 0;
1988 VarDeclBits.SClass = SC;
1989 // Everything else is implicitly initialized to false.
1990 }
1991
Create(ASTContext & C,DeclContext * DC,SourceLocation StartL,SourceLocation IdL,IdentifierInfo * Id,QualType T,TypeSourceInfo * TInfo,StorageClass S)1992 VarDecl *VarDecl::Create(ASTContext &C, DeclContext *DC,
1993 SourceLocation StartL, SourceLocation IdL,
1994 IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo,
1995 StorageClass S) {
1996 return new (C, DC) VarDecl(Var, C, DC, StartL, IdL, Id, T, TInfo, S);
1997 }
1998
CreateDeserialized(ASTContext & C,unsigned ID)1999 VarDecl *VarDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
2000 return new (C, ID)
2001 VarDecl(Var, C, nullptr, SourceLocation(), SourceLocation(), nullptr,
2002 QualType(), nullptr, SC_None);
2003 }
2004
setStorageClass(StorageClass SC)2005 void VarDecl::setStorageClass(StorageClass SC) {
2006 assert(isLegalForVariable(SC));
2007 VarDeclBits.SClass = SC;
2008 }
2009
getTLSKind() const2010 VarDecl::TLSKind VarDecl::getTLSKind() const {
2011 switch (VarDeclBits.TSCSpec) {
2012 case TSCS_unspecified:
2013 if (!hasAttr<ThreadAttr>() &&
2014 !(getASTContext().getLangOpts().OpenMPUseTLS &&
2015 getASTContext().getTargetInfo().isTLSSupported() &&
2016 hasAttr<OMPThreadPrivateDeclAttr>()))
2017 return TLS_None;
2018 return ((getASTContext().getLangOpts().isCompatibleWithMSVC(
2019 LangOptions::MSVC2015)) ||
2020 hasAttr<OMPThreadPrivateDeclAttr>())
2021 ? TLS_Dynamic
2022 : TLS_Static;
2023 case TSCS___thread: // Fall through.
2024 case TSCS__Thread_local:
2025 return TLS_Static;
2026 case TSCS_thread_local:
2027 return TLS_Dynamic;
2028 }
2029 llvm_unreachable("Unknown thread storage class specifier!");
2030 }
2031
getSourceRange() const2032 SourceRange VarDecl::getSourceRange() const {
2033 if (const Expr *Init = getInit()) {
2034 SourceLocation InitEnd = Init->getEndLoc();
2035 // If Init is implicit, ignore its source range and fallback on
2036 // DeclaratorDecl::getSourceRange() to handle postfix elements.
2037 if (InitEnd.isValid() && InitEnd != getLocation())
2038 return SourceRange(getOuterLocStart(), InitEnd);
2039 }
2040 return DeclaratorDecl::getSourceRange();
2041 }
2042
2043 template<typename T>
getDeclLanguageLinkage(const T & D)2044 static LanguageLinkage getDeclLanguageLinkage(const T &D) {
2045 // C++ [dcl.link]p1: All function types, function names with external linkage,
2046 // and variable names with external linkage have a language linkage.
2047 if (!D.hasExternalFormalLinkage())
2048 return NoLanguageLinkage;
2049
2050 // Language linkage is a C++ concept, but saying that everything else in C has
2051 // C language linkage fits the implementation nicely.
2052 ASTContext &Context = D.getASTContext();
2053 if (!Context.getLangOpts().CPlusPlus)
2054 return CLanguageLinkage;
2055
2056 // C++ [dcl.link]p4: A C language linkage is ignored in determining the
2057 // language linkage of the names of class members and the function type of
2058 // class member functions.
2059 const DeclContext *DC = D.getDeclContext();
2060 if (DC->isRecord())
2061 return CXXLanguageLinkage;
2062
2063 // If the first decl is in an extern "C" context, any other redeclaration
2064 // will have C language linkage. If the first one is not in an extern "C"
2065 // context, we would have reported an error for any other decl being in one.
2066 if (isFirstInExternCContext(&D))
2067 return CLanguageLinkage;
2068 return CXXLanguageLinkage;
2069 }
2070
2071 template<typename T>
isDeclExternC(const T & D)2072 static bool isDeclExternC(const T &D) {
2073 // Since the context is ignored for class members, they can only have C++
2074 // language linkage or no language linkage.
2075 const DeclContext *DC = D.getDeclContext();
2076 if (DC->isRecord()) {
2077 assert(D.getASTContext().getLangOpts().CPlusPlus);
2078 return false;
2079 }
2080
2081 return D.getLanguageLinkage() == CLanguageLinkage;
2082 }
2083
getLanguageLinkage() const2084 LanguageLinkage VarDecl::getLanguageLinkage() const {
2085 return getDeclLanguageLinkage(*this);
2086 }
2087
isExternC() const2088 bool VarDecl::isExternC() const {
2089 return isDeclExternC(*this);
2090 }
2091
isInExternCContext() const2092 bool VarDecl::isInExternCContext() const {
2093 return getLexicalDeclContext()->isExternCContext();
2094 }
2095
isInExternCXXContext() const2096 bool VarDecl::isInExternCXXContext() const {
2097 return getLexicalDeclContext()->isExternCXXContext();
2098 }
2099
getCanonicalDecl()2100 VarDecl *VarDecl::getCanonicalDecl() { return getFirstDecl(); }
2101
2102 VarDecl::DefinitionKind
isThisDeclarationADefinition(ASTContext & C) const2103 VarDecl::isThisDeclarationADefinition(ASTContext &C) const {
2104 if (isThisDeclarationADemotedDefinition())
2105 return DeclarationOnly;
2106
2107 // C++ [basic.def]p2:
2108 // A declaration is a definition unless [...] it contains the 'extern'
2109 // specifier or a linkage-specification and neither an initializer [...],
2110 // it declares a non-inline static data member in a class declaration [...],
2111 // it declares a static data member outside a class definition and the variable
2112 // was defined within the class with the constexpr specifier [...],
2113 // C++1y [temp.expl.spec]p15:
2114 // An explicit specialization of a static data member or an explicit
2115 // specialization of a static data member template is a definition if the
2116 // declaration includes an initializer; otherwise, it is a declaration.
2117 //
2118 // FIXME: How do you declare (but not define) a partial specialization of
2119 // a static data member template outside the containing class?
2120 if (isStaticDataMember()) {
2121 if (isOutOfLine() &&
2122 !(getCanonicalDecl()->isInline() &&
2123 getCanonicalDecl()->isConstexpr()) &&
2124 (hasInit() ||
2125 // If the first declaration is out-of-line, this may be an
2126 // instantiation of an out-of-line partial specialization of a variable
2127 // template for which we have not yet instantiated the initializer.
2128 (getFirstDecl()->isOutOfLine()
2129 ? getTemplateSpecializationKind() == TSK_Undeclared
2130 : getTemplateSpecializationKind() !=
2131 TSK_ExplicitSpecialization) ||
2132 isa<VarTemplatePartialSpecializationDecl>(this)))
2133 return Definition;
2134 if (!isOutOfLine() && isInline())
2135 return Definition;
2136 return DeclarationOnly;
2137 }
2138 // C99 6.7p5:
2139 // A definition of an identifier is a declaration for that identifier that
2140 // [...] causes storage to be reserved for that object.
2141 // Note: that applies for all non-file-scope objects.
2142 // C99 6.9.2p1:
2143 // If the declaration of an identifier for an object has file scope and an
2144 // initializer, the declaration is an external definition for the identifier
2145 if (hasInit())
2146 return Definition;
2147
2148 if (hasDefiningAttr())
2149 return Definition;
2150
2151 if (const auto *SAA = getAttr<SelectAnyAttr>())
2152 if (!SAA->isInherited())
2153 return Definition;
2154
2155 // A variable template specialization (other than a static data member
2156 // template or an explicit specialization) is a declaration until we
2157 // instantiate its initializer.
2158 if (auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(this)) {
2159 if (VTSD->getTemplateSpecializationKind() != TSK_ExplicitSpecialization &&
2160 !isa<VarTemplatePartialSpecializationDecl>(VTSD) &&
2161 !VTSD->IsCompleteDefinition)
2162 return DeclarationOnly;
2163 }
2164
2165 if (hasExternalStorage())
2166 return DeclarationOnly;
2167
2168 // [dcl.link] p7:
2169 // A declaration directly contained in a linkage-specification is treated
2170 // as if it contains the extern specifier for the purpose of determining
2171 // the linkage of the declared name and whether it is a definition.
2172 if (isSingleLineLanguageLinkage(*this))
2173 return DeclarationOnly;
2174
2175 // C99 6.9.2p2:
2176 // A declaration of an object that has file scope without an initializer,
2177 // and without a storage class specifier or the scs 'static', constitutes
2178 // a tentative definition.
2179 // No such thing in C++.
2180 if (!C.getLangOpts().CPlusPlus && isFileVarDecl())
2181 return TentativeDefinition;
2182
2183 // What's left is (in C, block-scope) declarations without initializers or
2184 // external storage. These are definitions.
2185 return Definition;
2186 }
2187
getActingDefinition()2188 VarDecl *VarDecl::getActingDefinition() {
2189 DefinitionKind Kind = isThisDeclarationADefinition();
2190 if (Kind != TentativeDefinition)
2191 return nullptr;
2192
2193 VarDecl *LastTentative = nullptr;
2194 VarDecl *First = getFirstDecl();
2195 for (auto I : First->redecls()) {
2196 Kind = I->isThisDeclarationADefinition();
2197 if (Kind == Definition)
2198 return nullptr;
2199 if (Kind == TentativeDefinition)
2200 LastTentative = I;
2201 }
2202 return LastTentative;
2203 }
2204
getDefinition(ASTContext & C)2205 VarDecl *VarDecl::getDefinition(ASTContext &C) {
2206 VarDecl *First = getFirstDecl();
2207 for (auto I : First->redecls()) {
2208 if (I->isThisDeclarationADefinition(C) == Definition)
2209 return I;
2210 }
2211 return nullptr;
2212 }
2213
hasDefinition(ASTContext & C) const2214 VarDecl::DefinitionKind VarDecl::hasDefinition(ASTContext &C) const {
2215 DefinitionKind Kind = DeclarationOnly;
2216
2217 const VarDecl *First = getFirstDecl();
2218 for (auto I : First->redecls()) {
2219 Kind = std::max(Kind, I->isThisDeclarationADefinition(C));
2220 if (Kind == Definition)
2221 break;
2222 }
2223
2224 return Kind;
2225 }
2226
getAnyInitializer(const VarDecl * & D) const2227 const Expr *VarDecl::getAnyInitializer(const VarDecl *&D) const {
2228 for (auto I : redecls()) {
2229 if (auto Expr = I->getInit()) {
2230 D = I;
2231 return Expr;
2232 }
2233 }
2234 return nullptr;
2235 }
2236
hasInit() const2237 bool VarDecl::hasInit() const {
2238 if (auto *P = dyn_cast<ParmVarDecl>(this))
2239 if (P->hasUnparsedDefaultArg() || P->hasUninstantiatedDefaultArg())
2240 return false;
2241
2242 return !Init.isNull();
2243 }
2244
getInit()2245 Expr *VarDecl::getInit() {
2246 if (!hasInit())
2247 return nullptr;
2248
2249 if (auto *S = Init.dyn_cast<Stmt *>())
2250 return cast<Expr>(S);
2251
2252 return cast_or_null<Expr>(Init.get<EvaluatedStmt *>()->Value);
2253 }
2254
getInitAddress()2255 Stmt **VarDecl::getInitAddress() {
2256 if (auto *ES = Init.dyn_cast<EvaluatedStmt *>())
2257 return &ES->Value;
2258
2259 return Init.getAddrOfPtr1();
2260 }
2261
getInitializingDeclaration()2262 VarDecl *VarDecl::getInitializingDeclaration() {
2263 VarDecl *Def = nullptr;
2264 for (auto I : redecls()) {
2265 if (I->hasInit())
2266 return I;
2267
2268 if (I->isThisDeclarationADefinition()) {
2269 if (isStaticDataMember())
2270 return I;
2271 Def = I;
2272 }
2273 }
2274 return Def;
2275 }
2276
isOutOfLine() const2277 bool VarDecl::isOutOfLine() const {
2278 if (Decl::isOutOfLine())
2279 return true;
2280
2281 if (!isStaticDataMember())
2282 return false;
2283
2284 // If this static data member was instantiated from a static data member of
2285 // a class template, check whether that static data member was defined
2286 // out-of-line.
2287 if (VarDecl *VD = getInstantiatedFromStaticDataMember())
2288 return VD->isOutOfLine();
2289
2290 return false;
2291 }
2292
setInit(Expr * I)2293 void VarDecl::setInit(Expr *I) {
2294 if (auto *Eval = Init.dyn_cast<EvaluatedStmt *>()) {
2295 Eval->~EvaluatedStmt();
2296 getASTContext().Deallocate(Eval);
2297 }
2298
2299 Init = I;
2300 }
2301
mightBeUsableInConstantExpressions(const ASTContext & C) const2302 bool VarDecl::mightBeUsableInConstantExpressions(const ASTContext &C) const {
2303 const LangOptions &Lang = C.getLangOpts();
2304
2305 // OpenCL permits const integral variables to be used in constant
2306 // expressions, like in C++98.
2307 if (!Lang.CPlusPlus && !Lang.OpenCL)
2308 return false;
2309
2310 // Function parameters are never usable in constant expressions.
2311 if (isa<ParmVarDecl>(this))
2312 return false;
2313
2314 // The values of weak variables are never usable in constant expressions.
2315 if (isWeak())
2316 return false;
2317
2318 // In C++11, any variable of reference type can be used in a constant
2319 // expression if it is initialized by a constant expression.
2320 if (Lang.CPlusPlus11 && getType()->isReferenceType())
2321 return true;
2322
2323 // Only const objects can be used in constant expressions in C++. C++98 does
2324 // not require the variable to be non-volatile, but we consider this to be a
2325 // defect.
2326 if (!getType().isConstant(C) || getType().isVolatileQualified())
2327 return false;
2328
2329 // In C++, const, non-volatile variables of integral or enumeration types
2330 // can be used in constant expressions.
2331 if (getType()->isIntegralOrEnumerationType())
2332 return true;
2333
2334 // Additionally, in C++11, non-volatile constexpr variables can be used in
2335 // constant expressions.
2336 return Lang.CPlusPlus11 && isConstexpr();
2337 }
2338
isUsableInConstantExpressions(const ASTContext & Context) const2339 bool VarDecl::isUsableInConstantExpressions(const ASTContext &Context) const {
2340 // C++2a [expr.const]p3:
2341 // A variable is usable in constant expressions after its initializing
2342 // declaration is encountered...
2343 const VarDecl *DefVD = nullptr;
2344 const Expr *Init = getAnyInitializer(DefVD);
2345 if (!Init || Init->isValueDependent() || getType()->isDependentType())
2346 return false;
2347 // ... if it is a constexpr variable, or it is of reference type or of
2348 // const-qualified integral or enumeration type, ...
2349 if (!DefVD->mightBeUsableInConstantExpressions(Context))
2350 return false;
2351 // ... and its initializer is a constant initializer.
2352 if (Context.getLangOpts().CPlusPlus && !DefVD->hasConstantInitialization())
2353 return false;
2354 // C++98 [expr.const]p1:
2355 // An integral constant-expression can involve only [...] const variables
2356 // or static data members of integral or enumeration types initialized with
2357 // [integer] constant expressions (dcl.init)
2358 if ((Context.getLangOpts().CPlusPlus || Context.getLangOpts().OpenCL) &&
2359 !Context.getLangOpts().CPlusPlus11 && !DefVD->hasICEInitializer(Context))
2360 return false;
2361 return true;
2362 }
2363
2364 /// Convert the initializer for this declaration to the elaborated EvaluatedStmt
2365 /// form, which contains extra information on the evaluated value of the
2366 /// initializer.
ensureEvaluatedStmt() const2367 EvaluatedStmt *VarDecl::ensureEvaluatedStmt() const {
2368 auto *Eval = Init.dyn_cast<EvaluatedStmt *>();
2369 if (!Eval) {
2370 // Note: EvaluatedStmt contains an APValue, which usually holds
2371 // resources not allocated from the ASTContext. We need to do some
2372 // work to avoid leaking those, but we do so in VarDecl::evaluateValue
2373 // where we can detect whether there's anything to clean up or not.
2374 Eval = new (getASTContext()) EvaluatedStmt;
2375 Eval->Value = Init.get<Stmt *>();
2376 Init = Eval;
2377 }
2378 return Eval;
2379 }
2380
getEvaluatedStmt() const2381 EvaluatedStmt *VarDecl::getEvaluatedStmt() const {
2382 return Init.dyn_cast<EvaluatedStmt *>();
2383 }
2384
evaluateValue() const2385 APValue *VarDecl::evaluateValue() const {
2386 SmallVector<PartialDiagnosticAt, 8> Notes;
2387 return evaluateValueImpl(Notes, hasConstantInitialization());
2388 }
2389
evaluateValueImpl(SmallVectorImpl<PartialDiagnosticAt> & Notes,bool IsConstantInitialization) const2390 APValue *VarDecl::evaluateValueImpl(SmallVectorImpl<PartialDiagnosticAt> &Notes,
2391 bool IsConstantInitialization) const {
2392 EvaluatedStmt *Eval = ensureEvaluatedStmt();
2393
2394 const auto *Init = cast<Expr>(Eval->Value);
2395 assert(!Init->isValueDependent());
2396
2397 // We only produce notes indicating why an initializer is non-constant the
2398 // first time it is evaluated. FIXME: The notes won't always be emitted the
2399 // first time we try evaluation, so might not be produced at all.
2400 if (Eval->WasEvaluated)
2401 return Eval->Evaluated.isAbsent() ? nullptr : &Eval->Evaluated;
2402
2403 if (Eval->IsEvaluating) {
2404 // FIXME: Produce a diagnostic for self-initialization.
2405 return nullptr;
2406 }
2407
2408 Eval->IsEvaluating = true;
2409
2410 ASTContext &Ctx = getASTContext();
2411 bool Result = Init->EvaluateAsInitializer(Eval->Evaluated, Ctx, this, Notes,
2412 IsConstantInitialization);
2413
2414 // In C++11, this isn't a constant initializer if we produced notes. In that
2415 // case, we can't keep the result, because it may only be correct under the
2416 // assumption that the initializer is a constant context.
2417 if (IsConstantInitialization && Ctx.getLangOpts().CPlusPlus11 &&
2418 !Notes.empty())
2419 Result = false;
2420
2421 // Ensure the computed APValue is cleaned up later if evaluation succeeded,
2422 // or that it's empty (so that there's nothing to clean up) if evaluation
2423 // failed.
2424 if (!Result)
2425 Eval->Evaluated = APValue();
2426 else if (Eval->Evaluated.needsCleanup())
2427 Ctx.addDestruction(&Eval->Evaluated);
2428
2429 Eval->IsEvaluating = false;
2430 Eval->WasEvaluated = true;
2431
2432 return Result ? &Eval->Evaluated : nullptr;
2433 }
2434
getEvaluatedValue() const2435 APValue *VarDecl::getEvaluatedValue() const {
2436 if (EvaluatedStmt *Eval = getEvaluatedStmt())
2437 if (Eval->WasEvaluated)
2438 return &Eval->Evaluated;
2439
2440 return nullptr;
2441 }
2442
hasICEInitializer(const ASTContext & Context) const2443 bool VarDecl::hasICEInitializer(const ASTContext &Context) const {
2444 const Expr *Init = getInit();
2445 assert(Init && "no initializer");
2446
2447 EvaluatedStmt *Eval = ensureEvaluatedStmt();
2448 if (!Eval->CheckedForICEInit) {
2449 Eval->CheckedForICEInit = true;
2450 Eval->HasICEInit = Init->isIntegerConstantExpr(Context);
2451 }
2452 return Eval->HasICEInit;
2453 }
2454
hasConstantInitialization() const2455 bool VarDecl::hasConstantInitialization() const {
2456 // In C, all globals (and only globals) have constant initialization.
2457 if (hasGlobalStorage() && !getASTContext().getLangOpts().CPlusPlus)
2458 return true;
2459
2460 // In C++, it depends on whether the evaluation at the point of definition
2461 // was evaluatable as a constant initializer.
2462 if (EvaluatedStmt *Eval = getEvaluatedStmt())
2463 return Eval->HasConstantInitialization;
2464
2465 return false;
2466 }
2467
checkForConstantInitialization(SmallVectorImpl<PartialDiagnosticAt> & Notes) const2468 bool VarDecl::checkForConstantInitialization(
2469 SmallVectorImpl<PartialDiagnosticAt> &Notes) const {
2470 EvaluatedStmt *Eval = ensureEvaluatedStmt();
2471 // If we ask for the value before we know whether we have a constant
2472 // initializer, we can compute the wrong value (for example, due to
2473 // std::is_constant_evaluated()).
2474 assert(!Eval->WasEvaluated &&
2475 "already evaluated var value before checking for constant init");
2476 assert(getASTContext().getLangOpts().CPlusPlus && "only meaningful in C++");
2477
2478 assert(!cast<Expr>(Eval->Value)->isValueDependent());
2479
2480 // Evaluate the initializer to check whether it's a constant expression.
2481 Eval->HasConstantInitialization =
2482 evaluateValueImpl(Notes, true) && Notes.empty();
2483
2484 // If evaluation as a constant initializer failed, allow re-evaluation as a
2485 // non-constant initializer if we later find we want the value.
2486 if (!Eval->HasConstantInitialization)
2487 Eval->WasEvaluated = false;
2488
2489 return Eval->HasConstantInitialization;
2490 }
2491
isParameterPack() const2492 bool VarDecl::isParameterPack() const {
2493 return isa<PackExpansionType>(getType());
2494 }
2495
2496 template<typename DeclT>
getDefinitionOrSelf(DeclT * D)2497 static DeclT *getDefinitionOrSelf(DeclT *D) {
2498 assert(D);
2499 if (auto *Def = D->getDefinition())
2500 return Def;
2501 return D;
2502 }
2503
isEscapingByref() const2504 bool VarDecl::isEscapingByref() const {
2505 return hasAttr<BlocksAttr>() && NonParmVarDeclBits.EscapingByref;
2506 }
2507
isNonEscapingByref() const2508 bool VarDecl::isNonEscapingByref() const {
2509 return hasAttr<BlocksAttr>() && !NonParmVarDeclBits.EscapingByref;
2510 }
2511
getTemplateInstantiationPattern() const2512 VarDecl *VarDecl::getTemplateInstantiationPattern() const {
2513 const VarDecl *VD = this;
2514
2515 // If this is an instantiated member, walk back to the template from which
2516 // it was instantiated.
2517 if (MemberSpecializationInfo *MSInfo = VD->getMemberSpecializationInfo()) {
2518 if (isTemplateInstantiation(MSInfo->getTemplateSpecializationKind())) {
2519 VD = VD->getInstantiatedFromStaticDataMember();
2520 while (auto *NewVD = VD->getInstantiatedFromStaticDataMember())
2521 VD = NewVD;
2522 }
2523 }
2524
2525 // If it's an instantiated variable template specialization, find the
2526 // template or partial specialization from which it was instantiated.
2527 if (auto *VDTemplSpec = dyn_cast<VarTemplateSpecializationDecl>(VD)) {
2528 if (isTemplateInstantiation(VDTemplSpec->getTemplateSpecializationKind())) {
2529 auto From = VDTemplSpec->getInstantiatedFrom();
2530 if (auto *VTD = From.dyn_cast<VarTemplateDecl *>()) {
2531 while (!VTD->isMemberSpecialization()) {
2532 auto *NewVTD = VTD->getInstantiatedFromMemberTemplate();
2533 if (!NewVTD)
2534 break;
2535 VTD = NewVTD;
2536 }
2537 return getDefinitionOrSelf(VTD->getTemplatedDecl());
2538 }
2539 if (auto *VTPSD =
2540 From.dyn_cast<VarTemplatePartialSpecializationDecl *>()) {
2541 while (!VTPSD->isMemberSpecialization()) {
2542 auto *NewVTPSD = VTPSD->getInstantiatedFromMember();
2543 if (!NewVTPSD)
2544 break;
2545 VTPSD = NewVTPSD;
2546 }
2547 return getDefinitionOrSelf<VarDecl>(VTPSD);
2548 }
2549 }
2550 }
2551
2552 // If this is the pattern of a variable template, find where it was
2553 // instantiated from. FIXME: Is this necessary?
2554 if (VarTemplateDecl *VarTemplate = VD->getDescribedVarTemplate()) {
2555 while (!VarTemplate->isMemberSpecialization()) {
2556 auto *NewVT = VarTemplate->getInstantiatedFromMemberTemplate();
2557 if (!NewVT)
2558 break;
2559 VarTemplate = NewVT;
2560 }
2561
2562 return getDefinitionOrSelf(VarTemplate->getTemplatedDecl());
2563 }
2564
2565 if (VD == this)
2566 return nullptr;
2567 return getDefinitionOrSelf(const_cast<VarDecl*>(VD));
2568 }
2569
getInstantiatedFromStaticDataMember() const2570 VarDecl *VarDecl::getInstantiatedFromStaticDataMember() const {
2571 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2572 return cast<VarDecl>(MSI->getInstantiatedFrom());
2573
2574 return nullptr;
2575 }
2576
getTemplateSpecializationKind() const2577 TemplateSpecializationKind VarDecl::getTemplateSpecializationKind() const {
2578 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
2579 return Spec->getSpecializationKind();
2580
2581 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2582 return MSI->getTemplateSpecializationKind();
2583
2584 return TSK_Undeclared;
2585 }
2586
2587 TemplateSpecializationKind
getTemplateSpecializationKindForInstantiation() const2588 VarDecl::getTemplateSpecializationKindForInstantiation() const {
2589 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2590 return MSI->getTemplateSpecializationKind();
2591
2592 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
2593 return Spec->getSpecializationKind();
2594
2595 return TSK_Undeclared;
2596 }
2597
getPointOfInstantiation() const2598 SourceLocation VarDecl::getPointOfInstantiation() const {
2599 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
2600 return Spec->getPointOfInstantiation();
2601
2602 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2603 return MSI->getPointOfInstantiation();
2604
2605 return SourceLocation();
2606 }
2607
getDescribedVarTemplate() const2608 VarTemplateDecl *VarDecl::getDescribedVarTemplate() const {
2609 return getASTContext().getTemplateOrSpecializationInfo(this)
2610 .dyn_cast<VarTemplateDecl *>();
2611 }
2612
setDescribedVarTemplate(VarTemplateDecl * Template)2613 void VarDecl::setDescribedVarTemplate(VarTemplateDecl *Template) {
2614 getASTContext().setTemplateOrSpecializationInfo(this, Template);
2615 }
2616
isKnownToBeDefined() const2617 bool VarDecl::isKnownToBeDefined() const {
2618 const auto &LangOpts = getASTContext().getLangOpts();
2619 // In CUDA mode without relocatable device code, variables of form 'extern
2620 // __shared__ Foo foo[]' are pointers to the base of the GPU core's shared
2621 // memory pool. These are never undefined variables, even if they appear
2622 // inside of an anon namespace or static function.
2623 //
2624 // With CUDA relocatable device code enabled, these variables don't get
2625 // special handling; they're treated like regular extern variables.
2626 if (LangOpts.CUDA && !LangOpts.GPURelocatableDeviceCode &&
2627 hasExternalStorage() && hasAttr<CUDASharedAttr>() &&
2628 isa<IncompleteArrayType>(getType()))
2629 return true;
2630
2631 return hasDefinition();
2632 }
2633
isNoDestroy(const ASTContext & Ctx) const2634 bool VarDecl::isNoDestroy(const ASTContext &Ctx) const {
2635 return hasGlobalStorage() && (hasAttr<NoDestroyAttr>() ||
2636 (!Ctx.getLangOpts().RegisterStaticDestructors &&
2637 !hasAttr<AlwaysDestroyAttr>()));
2638 }
2639
2640 QualType::DestructionKind
needsDestruction(const ASTContext & Ctx) const2641 VarDecl::needsDestruction(const ASTContext &Ctx) const {
2642 if (EvaluatedStmt *Eval = getEvaluatedStmt())
2643 if (Eval->HasConstantDestruction)
2644 return QualType::DK_none;
2645
2646 if (isNoDestroy(Ctx))
2647 return QualType::DK_none;
2648
2649 return getType().isDestructedType();
2650 }
2651
getMemberSpecializationInfo() const2652 MemberSpecializationInfo *VarDecl::getMemberSpecializationInfo() const {
2653 if (isStaticDataMember())
2654 // FIXME: Remove ?
2655 // return getASTContext().getInstantiatedFromStaticDataMember(this);
2656 return getASTContext().getTemplateOrSpecializationInfo(this)
2657 .dyn_cast<MemberSpecializationInfo *>();
2658 return nullptr;
2659 }
2660
setTemplateSpecializationKind(TemplateSpecializationKind TSK,SourceLocation PointOfInstantiation)2661 void VarDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
2662 SourceLocation PointOfInstantiation) {
2663 assert((isa<VarTemplateSpecializationDecl>(this) ||
2664 getMemberSpecializationInfo()) &&
2665 "not a variable or static data member template specialization");
2666
2667 if (VarTemplateSpecializationDecl *Spec =
2668 dyn_cast<VarTemplateSpecializationDecl>(this)) {
2669 Spec->setSpecializationKind(TSK);
2670 if (TSK != TSK_ExplicitSpecialization &&
2671 PointOfInstantiation.isValid() &&
2672 Spec->getPointOfInstantiation().isInvalid()) {
2673 Spec->setPointOfInstantiation(PointOfInstantiation);
2674 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
2675 L->InstantiationRequested(this);
2676 }
2677 } else if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo()) {
2678 MSI->setTemplateSpecializationKind(TSK);
2679 if (TSK != TSK_ExplicitSpecialization && PointOfInstantiation.isValid() &&
2680 MSI->getPointOfInstantiation().isInvalid()) {
2681 MSI->setPointOfInstantiation(PointOfInstantiation);
2682 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
2683 L->InstantiationRequested(this);
2684 }
2685 }
2686 }
2687
2688 void
setInstantiationOfStaticDataMember(VarDecl * VD,TemplateSpecializationKind TSK)2689 VarDecl::setInstantiationOfStaticDataMember(VarDecl *VD,
2690 TemplateSpecializationKind TSK) {
2691 assert(getASTContext().getTemplateOrSpecializationInfo(this).isNull() &&
2692 "Previous template or instantiation?");
2693 getASTContext().setInstantiatedFromStaticDataMember(this, VD, TSK);
2694 }
2695
2696 //===----------------------------------------------------------------------===//
2697 // ParmVarDecl Implementation
2698 //===----------------------------------------------------------------------===//
2699
Create(ASTContext & C,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,IdentifierInfo * Id,QualType T,TypeSourceInfo * TInfo,StorageClass S,Expr * DefArg)2700 ParmVarDecl *ParmVarDecl::Create(ASTContext &C, DeclContext *DC,
2701 SourceLocation StartLoc,
2702 SourceLocation IdLoc, IdentifierInfo *Id,
2703 QualType T, TypeSourceInfo *TInfo,
2704 StorageClass S, Expr *DefArg) {
2705 return new (C, DC) ParmVarDecl(ParmVar, C, DC, StartLoc, IdLoc, Id, T, TInfo,
2706 S, DefArg);
2707 }
2708
getOriginalType() const2709 QualType ParmVarDecl::getOriginalType() const {
2710 TypeSourceInfo *TSI = getTypeSourceInfo();
2711 QualType T = TSI ? TSI->getType() : getType();
2712 if (const auto *DT = dyn_cast<DecayedType>(T))
2713 return DT->getOriginalType();
2714 return T;
2715 }
2716
CreateDeserialized(ASTContext & C,unsigned ID)2717 ParmVarDecl *ParmVarDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
2718 return new (C, ID)
2719 ParmVarDecl(ParmVar, C, nullptr, SourceLocation(), SourceLocation(),
2720 nullptr, QualType(), nullptr, SC_None, nullptr);
2721 }
2722
getSourceRange() const2723 SourceRange ParmVarDecl::getSourceRange() const {
2724 if (!hasInheritedDefaultArg()) {
2725 SourceRange ArgRange = getDefaultArgRange();
2726 if (ArgRange.isValid())
2727 return SourceRange(getOuterLocStart(), ArgRange.getEnd());
2728 }
2729
2730 // DeclaratorDecl considers the range of postfix types as overlapping with the
2731 // declaration name, but this is not the case with parameters in ObjC methods.
2732 if (isa<ObjCMethodDecl>(getDeclContext()))
2733 return SourceRange(DeclaratorDecl::getBeginLoc(), getLocation());
2734
2735 return DeclaratorDecl::getSourceRange();
2736 }
2737
isDestroyedInCallee() const2738 bool ParmVarDecl::isDestroyedInCallee() const {
2739 if (hasAttr<NSConsumedAttr>())
2740 return true;
2741
2742 auto *RT = getType()->getAs<RecordType>();
2743 if (RT && RT->getDecl()->isParamDestroyedInCallee())
2744 return true;
2745
2746 return false;
2747 }
2748
getDefaultArg()2749 Expr *ParmVarDecl::getDefaultArg() {
2750 assert(!hasUnparsedDefaultArg() && "Default argument is not yet parsed!");
2751 assert(!hasUninstantiatedDefaultArg() &&
2752 "Default argument is not yet instantiated!");
2753
2754 Expr *Arg = getInit();
2755 if (auto *E = dyn_cast_or_null<FullExpr>(Arg))
2756 return E->getSubExpr();
2757
2758 return Arg;
2759 }
2760
setDefaultArg(Expr * defarg)2761 void ParmVarDecl::setDefaultArg(Expr *defarg) {
2762 ParmVarDeclBits.DefaultArgKind = DAK_Normal;
2763 Init = defarg;
2764 }
2765
getDefaultArgRange() const2766 SourceRange ParmVarDecl::getDefaultArgRange() const {
2767 switch (ParmVarDeclBits.DefaultArgKind) {
2768 case DAK_None:
2769 case DAK_Unparsed:
2770 // Nothing we can do here.
2771 return SourceRange();
2772
2773 case DAK_Uninstantiated:
2774 return getUninstantiatedDefaultArg()->getSourceRange();
2775
2776 case DAK_Normal:
2777 if (const Expr *E = getInit())
2778 return E->getSourceRange();
2779
2780 // Missing an actual expression, may be invalid.
2781 return SourceRange();
2782 }
2783 llvm_unreachable("Invalid default argument kind.");
2784 }
2785
setUninstantiatedDefaultArg(Expr * arg)2786 void ParmVarDecl::setUninstantiatedDefaultArg(Expr *arg) {
2787 ParmVarDeclBits.DefaultArgKind = DAK_Uninstantiated;
2788 Init = arg;
2789 }
2790
getUninstantiatedDefaultArg()2791 Expr *ParmVarDecl::getUninstantiatedDefaultArg() {
2792 assert(hasUninstantiatedDefaultArg() &&
2793 "Wrong kind of initialization expression!");
2794 return cast_or_null<Expr>(Init.get<Stmt *>());
2795 }
2796
hasDefaultArg() const2797 bool ParmVarDecl::hasDefaultArg() const {
2798 // FIXME: We should just return false for DAK_None here once callers are
2799 // prepared for the case that we encountered an invalid default argument and
2800 // were unable to even build an invalid expression.
2801 return hasUnparsedDefaultArg() || hasUninstantiatedDefaultArg() ||
2802 !Init.isNull();
2803 }
2804
setParameterIndexLarge(unsigned parameterIndex)2805 void ParmVarDecl::setParameterIndexLarge(unsigned parameterIndex) {
2806 getASTContext().setParameterIndex(this, parameterIndex);
2807 ParmVarDeclBits.ParameterIndex = ParameterIndexSentinel;
2808 }
2809
getParameterIndexLarge() const2810 unsigned ParmVarDecl::getParameterIndexLarge() const {
2811 return getASTContext().getParameterIndex(this);
2812 }
2813
2814 //===----------------------------------------------------------------------===//
2815 // FunctionDecl Implementation
2816 //===----------------------------------------------------------------------===//
2817
FunctionDecl(Kind DK,ASTContext & C,DeclContext * DC,SourceLocation StartLoc,const DeclarationNameInfo & NameInfo,QualType T,TypeSourceInfo * TInfo,StorageClass S,bool isInlineSpecified,ConstexprSpecKind ConstexprKind,Expr * TrailingRequiresClause)2818 FunctionDecl::FunctionDecl(Kind DK, ASTContext &C, DeclContext *DC,
2819 SourceLocation StartLoc,
2820 const DeclarationNameInfo &NameInfo, QualType T,
2821 TypeSourceInfo *TInfo, StorageClass S,
2822 bool isInlineSpecified,
2823 ConstexprSpecKind ConstexprKind,
2824 Expr *TrailingRequiresClause)
2825 : DeclaratorDecl(DK, DC, NameInfo.getLoc(), NameInfo.getName(), T, TInfo,
2826 StartLoc),
2827 DeclContext(DK), redeclarable_base(C), Body(), ODRHash(0),
2828 EndRangeLoc(NameInfo.getEndLoc()), DNLoc(NameInfo.getInfo()) {
2829 assert(T.isNull() || T->isFunctionType());
2830 FunctionDeclBits.SClass = S;
2831 FunctionDeclBits.IsInline = isInlineSpecified;
2832 FunctionDeclBits.IsInlineSpecified = isInlineSpecified;
2833 FunctionDeclBits.IsVirtualAsWritten = false;
2834 FunctionDeclBits.IsPure = false;
2835 FunctionDeclBits.HasInheritedPrototype = false;
2836 FunctionDeclBits.HasWrittenPrototype = true;
2837 FunctionDeclBits.IsDeleted = false;
2838 FunctionDeclBits.IsTrivial = false;
2839 FunctionDeclBits.IsTrivialForCall = false;
2840 FunctionDeclBits.IsDefaulted = false;
2841 FunctionDeclBits.IsExplicitlyDefaulted = false;
2842 FunctionDeclBits.HasDefaultedFunctionInfo = false;
2843 FunctionDeclBits.HasImplicitReturnZero = false;
2844 FunctionDeclBits.IsLateTemplateParsed = false;
2845 FunctionDeclBits.ConstexprKind = static_cast<uint64_t>(ConstexprKind);
2846 FunctionDeclBits.InstantiationIsPending = false;
2847 FunctionDeclBits.UsesSEHTry = false;
2848 FunctionDeclBits.UsesFPIntrin = false;
2849 FunctionDeclBits.HasSkippedBody = false;
2850 FunctionDeclBits.WillHaveBody = false;
2851 FunctionDeclBits.IsMultiVersion = false;
2852 FunctionDeclBits.IsCopyDeductionCandidate = false;
2853 FunctionDeclBits.HasODRHash = false;
2854 if (TrailingRequiresClause)
2855 setTrailingRequiresClause(TrailingRequiresClause);
2856 }
2857
getNameForDiagnostic(raw_ostream & OS,const PrintingPolicy & Policy,bool Qualified) const2858 void FunctionDecl::getNameForDiagnostic(
2859 raw_ostream &OS, const PrintingPolicy &Policy, bool Qualified) const {
2860 NamedDecl::getNameForDiagnostic(OS, Policy, Qualified);
2861 const TemplateArgumentList *TemplateArgs = getTemplateSpecializationArgs();
2862 if (TemplateArgs)
2863 printTemplateArgumentList(OS, TemplateArgs->asArray(), Policy);
2864 }
2865
isVariadic() const2866 bool FunctionDecl::isVariadic() const {
2867 if (const auto *FT = getType()->getAs<FunctionProtoType>())
2868 return FT->isVariadic();
2869 return false;
2870 }
2871
2872 FunctionDecl::DefaultedFunctionInfo *
Create(ASTContext & Context,ArrayRef<DeclAccessPair> Lookups)2873 FunctionDecl::DefaultedFunctionInfo::Create(ASTContext &Context,
2874 ArrayRef<DeclAccessPair> Lookups) {
2875 DefaultedFunctionInfo *Info = new (Context.Allocate(
2876 totalSizeToAlloc<DeclAccessPair>(Lookups.size()),
2877 std::max(alignof(DefaultedFunctionInfo), alignof(DeclAccessPair))))
2878 DefaultedFunctionInfo;
2879 Info->NumLookups = Lookups.size();
2880 std::uninitialized_copy(Lookups.begin(), Lookups.end(),
2881 Info->getTrailingObjects<DeclAccessPair>());
2882 return Info;
2883 }
2884
setDefaultedFunctionInfo(DefaultedFunctionInfo * Info)2885 void FunctionDecl::setDefaultedFunctionInfo(DefaultedFunctionInfo *Info) {
2886 assert(!FunctionDeclBits.HasDefaultedFunctionInfo && "already have this");
2887 assert(!Body && "can't replace function body with defaulted function info");
2888
2889 FunctionDeclBits.HasDefaultedFunctionInfo = true;
2890 DefaultedInfo = Info;
2891 }
2892
2893 FunctionDecl::DefaultedFunctionInfo *
getDefaultedFunctionInfo() const2894 FunctionDecl::getDefaultedFunctionInfo() const {
2895 return FunctionDeclBits.HasDefaultedFunctionInfo ? DefaultedInfo : nullptr;
2896 }
2897
hasBody(const FunctionDecl * & Definition) const2898 bool FunctionDecl::hasBody(const FunctionDecl *&Definition) const {
2899 for (auto I : redecls()) {
2900 if (I->doesThisDeclarationHaveABody()) {
2901 Definition = I;
2902 return true;
2903 }
2904 }
2905
2906 return false;
2907 }
2908
hasTrivialBody() const2909 bool FunctionDecl::hasTrivialBody() const {
2910 Stmt *S = getBody();
2911 if (!S) {
2912 // Since we don't have a body for this function, we don't know if it's
2913 // trivial or not.
2914 return false;
2915 }
2916
2917 if (isa<CompoundStmt>(S) && cast<CompoundStmt>(S)->body_empty())
2918 return true;
2919 return false;
2920 }
2921
isThisDeclarationInstantiatedFromAFriendDefinition() const2922 bool FunctionDecl::isThisDeclarationInstantiatedFromAFriendDefinition() const {
2923 if (!getFriendObjectKind())
2924 return false;
2925
2926 // Check for a friend function instantiated from a friend function
2927 // definition in a templated class.
2928 if (const FunctionDecl *InstantiatedFrom =
2929 getInstantiatedFromMemberFunction())
2930 return InstantiatedFrom->getFriendObjectKind() &&
2931 InstantiatedFrom->isThisDeclarationADefinition();
2932
2933 // Check for a friend function template instantiated from a friend
2934 // function template definition in a templated class.
2935 if (const FunctionTemplateDecl *Template = getDescribedFunctionTemplate()) {
2936 if (const FunctionTemplateDecl *InstantiatedFrom =
2937 Template->getInstantiatedFromMemberTemplate())
2938 return InstantiatedFrom->getFriendObjectKind() &&
2939 InstantiatedFrom->isThisDeclarationADefinition();
2940 }
2941
2942 return false;
2943 }
2944
isDefined(const FunctionDecl * & Definition,bool CheckForPendingFriendDefinition) const2945 bool FunctionDecl::isDefined(const FunctionDecl *&Definition,
2946 bool CheckForPendingFriendDefinition) const {
2947 for (const FunctionDecl *FD : redecls()) {
2948 if (FD->isThisDeclarationADefinition()) {
2949 Definition = FD;
2950 return true;
2951 }
2952
2953 // If this is a friend function defined in a class template, it does not
2954 // have a body until it is used, nevertheless it is a definition, see
2955 // [temp.inst]p2:
2956 //
2957 // ... for the purpose of determining whether an instantiated redeclaration
2958 // is valid according to [basic.def.odr] and [class.mem], a declaration that
2959 // corresponds to a definition in the template is considered to be a
2960 // definition.
2961 //
2962 // The following code must produce redefinition error:
2963 //
2964 // template<typename T> struct C20 { friend void func_20() {} };
2965 // C20<int> c20i;
2966 // void func_20() {}
2967 //
2968 if (CheckForPendingFriendDefinition &&
2969 FD->isThisDeclarationInstantiatedFromAFriendDefinition()) {
2970 Definition = FD;
2971 return true;
2972 }
2973 }
2974
2975 return false;
2976 }
2977
getBody(const FunctionDecl * & Definition) const2978 Stmt *FunctionDecl::getBody(const FunctionDecl *&Definition) const {
2979 if (!hasBody(Definition))
2980 return nullptr;
2981
2982 assert(!Definition->FunctionDeclBits.HasDefaultedFunctionInfo &&
2983 "definition should not have a body");
2984 if (Definition->Body)
2985 return Definition->Body.get(getASTContext().getExternalSource());
2986
2987 return nullptr;
2988 }
2989
setBody(Stmt * B)2990 void FunctionDecl::setBody(Stmt *B) {
2991 FunctionDeclBits.HasDefaultedFunctionInfo = false;
2992 Body = LazyDeclStmtPtr(B);
2993 if (B)
2994 EndRangeLoc = B->getEndLoc();
2995 }
2996
setPure(bool P)2997 void FunctionDecl::setPure(bool P) {
2998 FunctionDeclBits.IsPure = P;
2999 if (P)
3000 if (auto *Parent = dyn_cast<CXXRecordDecl>(getDeclContext()))
3001 Parent->markedVirtualFunctionPure();
3002 }
3003
3004 template<std::size_t Len>
isNamed(const NamedDecl * ND,const char (& Str)[Len])3005 static bool isNamed(const NamedDecl *ND, const char (&Str)[Len]) {
3006 IdentifierInfo *II = ND->getIdentifier();
3007 return II && II->isStr(Str);
3008 }
3009
isMain() const3010 bool FunctionDecl::isMain() const {
3011 const TranslationUnitDecl *tunit =
3012 dyn_cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext());
3013 return tunit &&
3014 !tunit->getASTContext().getLangOpts().Freestanding &&
3015 isNamed(this, "main");
3016 }
3017
isMSVCRTEntryPoint() const3018 bool FunctionDecl::isMSVCRTEntryPoint() const {
3019 const TranslationUnitDecl *TUnit =
3020 dyn_cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext());
3021 if (!TUnit)
3022 return false;
3023
3024 // Even though we aren't really targeting MSVCRT if we are freestanding,
3025 // semantic analysis for these functions remains the same.
3026
3027 // MSVCRT entry points only exist on MSVCRT targets.
3028 if (!TUnit->getASTContext().getTargetInfo().getTriple().isOSMSVCRT())
3029 return false;
3030
3031 // Nameless functions like constructors cannot be entry points.
3032 if (!getIdentifier())
3033 return false;
3034
3035 return llvm::StringSwitch<bool>(getName())
3036 .Cases("main", // an ANSI console app
3037 "wmain", // a Unicode console App
3038 "WinMain", // an ANSI GUI app
3039 "wWinMain", // a Unicode GUI app
3040 "DllMain", // a DLL
3041 true)
3042 .Default(false);
3043 }
3044
isReservedGlobalPlacementOperator() const3045 bool FunctionDecl::isReservedGlobalPlacementOperator() const {
3046 assert(getDeclName().getNameKind() == DeclarationName::CXXOperatorName);
3047 assert(getDeclName().getCXXOverloadedOperator() == OO_New ||
3048 getDeclName().getCXXOverloadedOperator() == OO_Delete ||
3049 getDeclName().getCXXOverloadedOperator() == OO_Array_New ||
3050 getDeclName().getCXXOverloadedOperator() == OO_Array_Delete);
3051
3052 if (!getDeclContext()->getRedeclContext()->isTranslationUnit())
3053 return false;
3054
3055 const auto *proto = getType()->castAs<FunctionProtoType>();
3056 if (proto->getNumParams() != 2 || proto->isVariadic())
3057 return false;
3058
3059 ASTContext &Context =
3060 cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext())
3061 ->getASTContext();
3062
3063 // The result type and first argument type are constant across all
3064 // these operators. The second argument must be exactly void*.
3065 return (proto->getParamType(1).getCanonicalType() == Context.VoidPtrTy);
3066 }
3067
isReplaceableGlobalAllocationFunction(Optional<unsigned> * AlignmentParam,bool * IsNothrow) const3068 bool FunctionDecl::isReplaceableGlobalAllocationFunction(
3069 Optional<unsigned> *AlignmentParam, bool *IsNothrow) const {
3070 if (getDeclName().getNameKind() != DeclarationName::CXXOperatorName)
3071 return false;
3072 if (getDeclName().getCXXOverloadedOperator() != OO_New &&
3073 getDeclName().getCXXOverloadedOperator() != OO_Delete &&
3074 getDeclName().getCXXOverloadedOperator() != OO_Array_New &&
3075 getDeclName().getCXXOverloadedOperator() != OO_Array_Delete)
3076 return false;
3077
3078 if (isa<CXXRecordDecl>(getDeclContext()))
3079 return false;
3080
3081 // This can only fail for an invalid 'operator new' declaration.
3082 if (!getDeclContext()->getRedeclContext()->isTranslationUnit())
3083 return false;
3084
3085 const auto *FPT = getType()->castAs<FunctionProtoType>();
3086 if (FPT->getNumParams() == 0 || FPT->getNumParams() > 3 || FPT->isVariadic())
3087 return false;
3088
3089 // If this is a single-parameter function, it must be a replaceable global
3090 // allocation or deallocation function.
3091 if (FPT->getNumParams() == 1)
3092 return true;
3093
3094 unsigned Params = 1;
3095 QualType Ty = FPT->getParamType(Params);
3096 ASTContext &Ctx = getASTContext();
3097
3098 auto Consume = [&] {
3099 ++Params;
3100 Ty = Params < FPT->getNumParams() ? FPT->getParamType(Params) : QualType();
3101 };
3102
3103 // In C++14, the next parameter can be a 'std::size_t' for sized delete.
3104 bool IsSizedDelete = false;
3105 if (Ctx.getLangOpts().SizedDeallocation &&
3106 (getDeclName().getCXXOverloadedOperator() == OO_Delete ||
3107 getDeclName().getCXXOverloadedOperator() == OO_Array_Delete) &&
3108 Ctx.hasSameType(Ty, Ctx.getSizeType())) {
3109 IsSizedDelete = true;
3110 Consume();
3111 }
3112
3113 // In C++17, the next parameter can be a 'std::align_val_t' for aligned
3114 // new/delete.
3115 if (Ctx.getLangOpts().AlignedAllocation && !Ty.isNull() && Ty->isAlignValT()) {
3116 Consume();
3117 if (AlignmentParam)
3118 *AlignmentParam = Params;
3119 }
3120
3121 // Finally, if this is not a sized delete, the final parameter can
3122 // be a 'const std::nothrow_t&'.
3123 if (!IsSizedDelete && !Ty.isNull() && Ty->isReferenceType()) {
3124 Ty = Ty->getPointeeType();
3125 if (Ty.getCVRQualifiers() != Qualifiers::Const)
3126 return false;
3127 if (Ty->isNothrowT()) {
3128 if (IsNothrow)
3129 *IsNothrow = true;
3130 Consume();
3131 }
3132 }
3133
3134 return Params == FPT->getNumParams();
3135 }
3136
isInlineBuiltinDeclaration() const3137 bool FunctionDecl::isInlineBuiltinDeclaration() const {
3138 if (!getBuiltinID())
3139 return false;
3140
3141 const FunctionDecl *Definition;
3142 return hasBody(Definition) && Definition->isInlineSpecified();
3143 }
3144
isDestroyingOperatorDelete() const3145 bool FunctionDecl::isDestroyingOperatorDelete() const {
3146 // C++ P0722:
3147 // Within a class C, a single object deallocation function with signature
3148 // (T, std::destroying_delete_t, <more params>)
3149 // is a destroying operator delete.
3150 if (!isa<CXXMethodDecl>(this) || getOverloadedOperator() != OO_Delete ||
3151 getNumParams() < 2)
3152 return false;
3153
3154 auto *RD = getParamDecl(1)->getType()->getAsCXXRecordDecl();
3155 return RD && RD->isInStdNamespace() && RD->getIdentifier() &&
3156 RD->getIdentifier()->isStr("destroying_delete_t");
3157 }
3158
getLanguageLinkage() const3159 LanguageLinkage FunctionDecl::getLanguageLinkage() const {
3160 return getDeclLanguageLinkage(*this);
3161 }
3162
isExternC() const3163 bool FunctionDecl::isExternC() const {
3164 return isDeclExternC(*this);
3165 }
3166
isInExternCContext() const3167 bool FunctionDecl::isInExternCContext() const {
3168 if (hasAttr<OpenCLKernelAttr>())
3169 return true;
3170 return getLexicalDeclContext()->isExternCContext();
3171 }
3172
isInExternCXXContext() const3173 bool FunctionDecl::isInExternCXXContext() const {
3174 return getLexicalDeclContext()->isExternCXXContext();
3175 }
3176
isGlobal() const3177 bool FunctionDecl::isGlobal() const {
3178 if (const auto *Method = dyn_cast<CXXMethodDecl>(this))
3179 return Method->isStatic();
3180
3181 if (getCanonicalDecl()->getStorageClass() == SC_Static)
3182 return false;
3183
3184 for (const DeclContext *DC = getDeclContext();
3185 DC->isNamespace();
3186 DC = DC->getParent()) {
3187 if (const auto *Namespace = cast<NamespaceDecl>(DC)) {
3188 if (!Namespace->getDeclName())
3189 return false;
3190 break;
3191 }
3192 }
3193
3194 return true;
3195 }
3196
isNoReturn() const3197 bool FunctionDecl::isNoReturn() const {
3198 if (hasAttr<NoReturnAttr>() || hasAttr<CXX11NoReturnAttr>() ||
3199 hasAttr<C11NoReturnAttr>())
3200 return true;
3201
3202 if (auto *FnTy = getType()->getAs<FunctionType>())
3203 return FnTy->getNoReturnAttr();
3204
3205 return false;
3206 }
3207
3208
getMultiVersionKind() const3209 MultiVersionKind FunctionDecl::getMultiVersionKind() const {
3210 if (hasAttr<TargetAttr>())
3211 return MultiVersionKind::Target;
3212 if (hasAttr<CPUDispatchAttr>())
3213 return MultiVersionKind::CPUDispatch;
3214 if (hasAttr<CPUSpecificAttr>())
3215 return MultiVersionKind::CPUSpecific;
3216 return MultiVersionKind::None;
3217 }
3218
isCPUDispatchMultiVersion() const3219 bool FunctionDecl::isCPUDispatchMultiVersion() const {
3220 return isMultiVersion() && hasAttr<CPUDispatchAttr>();
3221 }
3222
isCPUSpecificMultiVersion() const3223 bool FunctionDecl::isCPUSpecificMultiVersion() const {
3224 return isMultiVersion() && hasAttr<CPUSpecificAttr>();
3225 }
3226
isTargetMultiVersion() const3227 bool FunctionDecl::isTargetMultiVersion() const {
3228 return isMultiVersion() && hasAttr<TargetAttr>();
3229 }
3230
3231 void
setPreviousDeclaration(FunctionDecl * PrevDecl)3232 FunctionDecl::setPreviousDeclaration(FunctionDecl *PrevDecl) {
3233 redeclarable_base::setPreviousDecl(PrevDecl);
3234
3235 if (FunctionTemplateDecl *FunTmpl = getDescribedFunctionTemplate()) {
3236 FunctionTemplateDecl *PrevFunTmpl
3237 = PrevDecl? PrevDecl->getDescribedFunctionTemplate() : nullptr;
3238 assert((!PrevDecl || PrevFunTmpl) && "Function/function template mismatch");
3239 FunTmpl->setPreviousDecl(PrevFunTmpl);
3240 }
3241
3242 if (PrevDecl && PrevDecl->isInlined())
3243 setImplicitlyInline(true);
3244 }
3245
getCanonicalDecl()3246 FunctionDecl *FunctionDecl::getCanonicalDecl() { return getFirstDecl(); }
3247
3248 /// Returns a value indicating whether this function corresponds to a builtin
3249 /// function.
3250 ///
3251 /// The function corresponds to a built-in function if it is declared at
3252 /// translation scope or within an extern "C" block and its name matches with
3253 /// the name of a builtin. The returned value will be 0 for functions that do
3254 /// not correspond to a builtin, a value of type \c Builtin::ID if in the
3255 /// target-independent range \c [1,Builtin::First), or a target-specific builtin
3256 /// value.
3257 ///
3258 /// \param ConsiderWrapperFunctions If true, we should consider wrapper
3259 /// functions as their wrapped builtins. This shouldn't be done in general, but
3260 /// it's useful in Sema to diagnose calls to wrappers based on their semantics.
getBuiltinID(bool ConsiderWrapperFunctions) const3261 unsigned FunctionDecl::getBuiltinID(bool ConsiderWrapperFunctions) const {
3262 unsigned BuiltinID = 0;
3263
3264 if (const auto *ABAA = getAttr<ArmBuiltinAliasAttr>()) {
3265 BuiltinID = ABAA->getBuiltinName()->getBuiltinID();
3266 } else if (const auto *A = getAttr<BuiltinAttr>()) {
3267 BuiltinID = A->getID();
3268 }
3269
3270 if (!BuiltinID)
3271 return 0;
3272
3273 // If the function is marked "overloadable", it has a different mangled name
3274 // and is not the C library function.
3275 if (!ConsiderWrapperFunctions && hasAttr<OverloadableAttr>() &&
3276 !hasAttr<ArmBuiltinAliasAttr>())
3277 return 0;
3278
3279 ASTContext &Context = getASTContext();
3280 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))
3281 return BuiltinID;
3282
3283 // This function has the name of a known C library
3284 // function. Determine whether it actually refers to the C library
3285 // function or whether it just has the same name.
3286
3287 // If this is a static function, it's not a builtin.
3288 if (!ConsiderWrapperFunctions && getStorageClass() == SC_Static)
3289 return 0;
3290
3291 // OpenCL v1.2 s6.9.f - The library functions defined in
3292 // the C99 standard headers are not available.
3293 if (Context.getLangOpts().OpenCL &&
3294 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))
3295 return 0;
3296
3297 // CUDA does not have device-side standard library. printf and malloc are the
3298 // only special cases that are supported by device-side runtime.
3299 if (Context.getLangOpts().CUDA && hasAttr<CUDADeviceAttr>() &&
3300 !hasAttr<CUDAHostAttr>() &&
3301 !(BuiltinID == Builtin::BIprintf || BuiltinID == Builtin::BImalloc))
3302 return 0;
3303
3304 // As AMDGCN implementation of OpenMP does not have a device-side standard
3305 // library, none of the predefined library functions except printf and malloc
3306 // should be treated as a builtin i.e. 0 should be returned for them.
3307 if (Context.getTargetInfo().getTriple().isAMDGCN() &&
3308 Context.getLangOpts().OpenMPIsDevice &&
3309 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID) &&
3310 !(BuiltinID == Builtin::BIprintf || BuiltinID == Builtin::BImalloc))
3311 return 0;
3312
3313 return BuiltinID;
3314 }
3315
3316 /// getNumParams - Return the number of parameters this function must have
3317 /// based on its FunctionType. This is the length of the ParamInfo array
3318 /// after it has been created.
getNumParams() const3319 unsigned FunctionDecl::getNumParams() const {
3320 const auto *FPT = getType()->getAs<FunctionProtoType>();
3321 return FPT ? FPT->getNumParams() : 0;
3322 }
3323
setParams(ASTContext & C,ArrayRef<ParmVarDecl * > NewParamInfo)3324 void FunctionDecl::setParams(ASTContext &C,
3325 ArrayRef<ParmVarDecl *> NewParamInfo) {
3326 assert(!ParamInfo && "Already has param info!");
3327 assert(NewParamInfo.size() == getNumParams() && "Parameter count mismatch!");
3328
3329 // Zero params -> null pointer.
3330 if (!NewParamInfo.empty()) {
3331 ParamInfo = new (C) ParmVarDecl*[NewParamInfo.size()];
3332 std::copy(NewParamInfo.begin(), NewParamInfo.end(), ParamInfo);
3333 }
3334 }
3335
3336 /// getMinRequiredArguments - Returns the minimum number of arguments
3337 /// needed to call this function. This may be fewer than the number of
3338 /// function parameters, if some of the parameters have default
3339 /// arguments (in C++) or are parameter packs (C++11).
getMinRequiredArguments() const3340 unsigned FunctionDecl::getMinRequiredArguments() const {
3341 if (!getASTContext().getLangOpts().CPlusPlus)
3342 return getNumParams();
3343
3344 // Note that it is possible for a parameter with no default argument to
3345 // follow a parameter with a default argument.
3346 unsigned NumRequiredArgs = 0;
3347 unsigned MinParamsSoFar = 0;
3348 for (auto *Param : parameters()) {
3349 if (!Param->isParameterPack()) {
3350 ++MinParamsSoFar;
3351 if (!Param->hasDefaultArg())
3352 NumRequiredArgs = MinParamsSoFar;
3353 }
3354 }
3355 return NumRequiredArgs;
3356 }
3357
hasOneParamOrDefaultArgs() const3358 bool FunctionDecl::hasOneParamOrDefaultArgs() const {
3359 return getNumParams() == 1 ||
3360 (getNumParams() > 1 &&
3361 std::all_of(param_begin() + 1, param_end(),
3362 [](ParmVarDecl *P) { return P->hasDefaultArg(); }));
3363 }
3364
3365 /// The combination of the extern and inline keywords under MSVC forces
3366 /// the function to be required.
3367 ///
3368 /// Note: This function assumes that we will only get called when isInlined()
3369 /// would return true for this FunctionDecl.
isMSExternInline() const3370 bool FunctionDecl::isMSExternInline() const {
3371 assert(isInlined() && "expected to get called on an inlined function!");
3372
3373 const ASTContext &Context = getASTContext();
3374 if (!Context.getTargetInfo().getCXXABI().isMicrosoft() &&
3375 !hasAttr<DLLExportAttr>())
3376 return false;
3377
3378 for (const FunctionDecl *FD = getMostRecentDecl(); FD;
3379 FD = FD->getPreviousDecl())
3380 if (!FD->isImplicit() && FD->getStorageClass() == SC_Extern)
3381 return true;
3382
3383 return false;
3384 }
3385
redeclForcesDefMSVC(const FunctionDecl * Redecl)3386 static bool redeclForcesDefMSVC(const FunctionDecl *Redecl) {
3387 if (Redecl->getStorageClass() != SC_Extern)
3388 return false;
3389
3390 for (const FunctionDecl *FD = Redecl->getPreviousDecl(); FD;
3391 FD = FD->getPreviousDecl())
3392 if (!FD->isImplicit() && FD->getStorageClass() == SC_Extern)
3393 return false;
3394
3395 return true;
3396 }
3397
RedeclForcesDefC99(const FunctionDecl * Redecl)3398 static bool RedeclForcesDefC99(const FunctionDecl *Redecl) {
3399 // Only consider file-scope declarations in this test.
3400 if (!Redecl->getLexicalDeclContext()->isTranslationUnit())
3401 return false;
3402
3403 // Only consider explicit declarations; the presence of a builtin for a
3404 // libcall shouldn't affect whether a definition is externally visible.
3405 if (Redecl->isImplicit())
3406 return false;
3407
3408 if (!Redecl->isInlineSpecified() || Redecl->getStorageClass() == SC_Extern)
3409 return true; // Not an inline definition
3410
3411 return false;
3412 }
3413
3414 /// For a function declaration in C or C++, determine whether this
3415 /// declaration causes the definition to be externally visible.
3416 ///
3417 /// For instance, this determines if adding the current declaration to the set
3418 /// of redeclarations of the given functions causes
3419 /// isInlineDefinitionExternallyVisible to change from false to true.
doesDeclarationForceExternallyVisibleDefinition() const3420 bool FunctionDecl::doesDeclarationForceExternallyVisibleDefinition() const {
3421 assert(!doesThisDeclarationHaveABody() &&
3422 "Must have a declaration without a body.");
3423
3424 ASTContext &Context = getASTContext();
3425
3426 if (Context.getLangOpts().MSVCCompat) {
3427 const FunctionDecl *Definition;
3428 if (hasBody(Definition) && Definition->isInlined() &&
3429 redeclForcesDefMSVC(this))
3430 return true;
3431 }
3432
3433 if (Context.getLangOpts().CPlusPlus)
3434 return false;
3435
3436 if (Context.getLangOpts().GNUInline || hasAttr<GNUInlineAttr>()) {
3437 // With GNU inlining, a declaration with 'inline' but not 'extern', forces
3438 // an externally visible definition.
3439 //
3440 // FIXME: What happens if gnu_inline gets added on after the first
3441 // declaration?
3442 if (!isInlineSpecified() || getStorageClass() == SC_Extern)
3443 return false;
3444
3445 const FunctionDecl *Prev = this;
3446 bool FoundBody = false;
3447 while ((Prev = Prev->getPreviousDecl())) {
3448 FoundBody |= Prev->doesThisDeclarationHaveABody();
3449
3450 if (Prev->doesThisDeclarationHaveABody()) {
3451 // If it's not the case that both 'inline' and 'extern' are
3452 // specified on the definition, then it is always externally visible.
3453 if (!Prev->isInlineSpecified() ||
3454 Prev->getStorageClass() != SC_Extern)
3455 return false;
3456 } else if (Prev->isInlineSpecified() &&
3457 Prev->getStorageClass() != SC_Extern) {
3458 return false;
3459 }
3460 }
3461 return FoundBody;
3462 }
3463
3464 // C99 6.7.4p6:
3465 // [...] If all of the file scope declarations for a function in a
3466 // translation unit include the inline function specifier without extern,
3467 // then the definition in that translation unit is an inline definition.
3468 if (isInlineSpecified() && getStorageClass() != SC_Extern)
3469 return false;
3470 const FunctionDecl *Prev = this;
3471 bool FoundBody = false;
3472 while ((Prev = Prev->getPreviousDecl())) {
3473 FoundBody |= Prev->doesThisDeclarationHaveABody();
3474 if (RedeclForcesDefC99(Prev))
3475 return false;
3476 }
3477 return FoundBody;
3478 }
3479
getFunctionTypeLoc() const3480 FunctionTypeLoc FunctionDecl::getFunctionTypeLoc() const {
3481 const TypeSourceInfo *TSI = getTypeSourceInfo();
3482 return TSI ? TSI->getTypeLoc().IgnoreParens().getAs<FunctionTypeLoc>()
3483 : FunctionTypeLoc();
3484 }
3485
getReturnTypeSourceRange() const3486 SourceRange FunctionDecl::getReturnTypeSourceRange() const {
3487 FunctionTypeLoc FTL = getFunctionTypeLoc();
3488 if (!FTL)
3489 return SourceRange();
3490
3491 // Skip self-referential return types.
3492 const SourceManager &SM = getASTContext().getSourceManager();
3493 SourceRange RTRange = FTL.getReturnLoc().getSourceRange();
3494 SourceLocation Boundary = getNameInfo().getBeginLoc();
3495 if (RTRange.isInvalid() || Boundary.isInvalid() ||
3496 !SM.isBeforeInTranslationUnit(RTRange.getEnd(), Boundary))
3497 return SourceRange();
3498
3499 return RTRange;
3500 }
3501
getParametersSourceRange() const3502 SourceRange FunctionDecl::getParametersSourceRange() const {
3503 unsigned NP = getNumParams();
3504 SourceLocation EllipsisLoc = getEllipsisLoc();
3505
3506 if (NP == 0 && EllipsisLoc.isInvalid())
3507 return SourceRange();
3508
3509 SourceLocation Begin =
3510 NP > 0 ? ParamInfo[0]->getSourceRange().getBegin() : EllipsisLoc;
3511 SourceLocation End = EllipsisLoc.isValid()
3512 ? EllipsisLoc
3513 : ParamInfo[NP - 1]->getSourceRange().getEnd();
3514
3515 return SourceRange(Begin, End);
3516 }
3517
getExceptionSpecSourceRange() const3518 SourceRange FunctionDecl::getExceptionSpecSourceRange() const {
3519 FunctionTypeLoc FTL = getFunctionTypeLoc();
3520 return FTL ? FTL.getExceptionSpecRange() : SourceRange();
3521 }
3522
3523 /// For an inline function definition in C, or for a gnu_inline function
3524 /// in C++, determine whether the definition will be externally visible.
3525 ///
3526 /// Inline function definitions are always available for inlining optimizations.
3527 /// However, depending on the language dialect, declaration specifiers, and
3528 /// attributes, the definition of an inline function may or may not be
3529 /// "externally" visible to other translation units in the program.
3530 ///
3531 /// In C99, inline definitions are not externally visible by default. However,
3532 /// if even one of the global-scope declarations is marked "extern inline", the
3533 /// inline definition becomes externally visible (C99 6.7.4p6).
3534 ///
3535 /// In GNU89 mode, or if the gnu_inline attribute is attached to the function
3536 /// definition, we use the GNU semantics for inline, which are nearly the
3537 /// opposite of C99 semantics. In particular, "inline" by itself will create
3538 /// an externally visible symbol, but "extern inline" will not create an
3539 /// externally visible symbol.
isInlineDefinitionExternallyVisible() const3540 bool FunctionDecl::isInlineDefinitionExternallyVisible() const {
3541 assert((doesThisDeclarationHaveABody() || willHaveBody() ||
3542 hasAttr<AliasAttr>()) &&
3543 "Must be a function definition");
3544 assert(isInlined() && "Function must be inline");
3545 ASTContext &Context = getASTContext();
3546
3547 if (Context.getLangOpts().GNUInline || hasAttr<GNUInlineAttr>()) {
3548 // Note: If you change the logic here, please change
3549 // doesDeclarationForceExternallyVisibleDefinition as well.
3550 //
3551 // If it's not the case that both 'inline' and 'extern' are
3552 // specified on the definition, then this inline definition is
3553 // externally visible.
3554 if (Context.getLangOpts().CPlusPlus)
3555 return false;
3556 if (!(isInlineSpecified() && getStorageClass() == SC_Extern))
3557 return true;
3558
3559 // If any declaration is 'inline' but not 'extern', then this definition
3560 // is externally visible.
3561 for (auto Redecl : redecls()) {
3562 if (Redecl->isInlineSpecified() &&
3563 Redecl->getStorageClass() != SC_Extern)
3564 return true;
3565 }
3566
3567 return false;
3568 }
3569
3570 // The rest of this function is C-only.
3571 assert(!Context.getLangOpts().CPlusPlus &&
3572 "should not use C inline rules in C++");
3573
3574 // C99 6.7.4p6:
3575 // [...] If all of the file scope declarations for a function in a
3576 // translation unit include the inline function specifier without extern,
3577 // then the definition in that translation unit is an inline definition.
3578 for (auto Redecl : redecls()) {
3579 if (RedeclForcesDefC99(Redecl))
3580 return true;
3581 }
3582
3583 // C99 6.7.4p6:
3584 // An inline definition does not provide an external definition for the
3585 // function, and does not forbid an external definition in another
3586 // translation unit.
3587 return false;
3588 }
3589
3590 /// getOverloadedOperator - Which C++ overloaded operator this
3591 /// function represents, if any.
getOverloadedOperator() const3592 OverloadedOperatorKind FunctionDecl::getOverloadedOperator() const {
3593 if (getDeclName().getNameKind() == DeclarationName::CXXOperatorName)
3594 return getDeclName().getCXXOverloadedOperator();
3595 return OO_None;
3596 }
3597
3598 /// getLiteralIdentifier - The literal suffix identifier this function
3599 /// represents, if any.
getLiteralIdentifier() const3600 const IdentifierInfo *FunctionDecl::getLiteralIdentifier() const {
3601 if (getDeclName().getNameKind() == DeclarationName::CXXLiteralOperatorName)
3602 return getDeclName().getCXXLiteralIdentifier();
3603 return nullptr;
3604 }
3605
getTemplatedKind() const3606 FunctionDecl::TemplatedKind FunctionDecl::getTemplatedKind() const {
3607 if (TemplateOrSpecialization.isNull())
3608 return TK_NonTemplate;
3609 if (TemplateOrSpecialization.is<FunctionTemplateDecl *>())
3610 return TK_FunctionTemplate;
3611 if (TemplateOrSpecialization.is<MemberSpecializationInfo *>())
3612 return TK_MemberSpecialization;
3613 if (TemplateOrSpecialization.is<FunctionTemplateSpecializationInfo *>())
3614 return TK_FunctionTemplateSpecialization;
3615 if (TemplateOrSpecialization.is
3616 <DependentFunctionTemplateSpecializationInfo*>())
3617 return TK_DependentFunctionTemplateSpecialization;
3618
3619 llvm_unreachable("Did we miss a TemplateOrSpecialization type?");
3620 }
3621
getInstantiatedFromMemberFunction() const3622 FunctionDecl *FunctionDecl::getInstantiatedFromMemberFunction() const {
3623 if (MemberSpecializationInfo *Info = getMemberSpecializationInfo())
3624 return cast<FunctionDecl>(Info->getInstantiatedFrom());
3625
3626 return nullptr;
3627 }
3628
getMemberSpecializationInfo() const3629 MemberSpecializationInfo *FunctionDecl::getMemberSpecializationInfo() const {
3630 if (auto *MSI =
3631 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
3632 return MSI;
3633 if (auto *FTSI = TemplateOrSpecialization
3634 .dyn_cast<FunctionTemplateSpecializationInfo *>())
3635 return FTSI->getMemberSpecializationInfo();
3636 return nullptr;
3637 }
3638
3639 void
setInstantiationOfMemberFunction(ASTContext & C,FunctionDecl * FD,TemplateSpecializationKind TSK)3640 FunctionDecl::setInstantiationOfMemberFunction(ASTContext &C,
3641 FunctionDecl *FD,
3642 TemplateSpecializationKind TSK) {
3643 assert(TemplateOrSpecialization.isNull() &&
3644 "Member function is already a specialization");
3645 MemberSpecializationInfo *Info
3646 = new (C) MemberSpecializationInfo(FD, TSK);
3647 TemplateOrSpecialization = Info;
3648 }
3649
getDescribedFunctionTemplate() const3650 FunctionTemplateDecl *FunctionDecl::getDescribedFunctionTemplate() const {
3651 return TemplateOrSpecialization.dyn_cast<FunctionTemplateDecl *>();
3652 }
3653
setDescribedFunctionTemplate(FunctionTemplateDecl * Template)3654 void FunctionDecl::setDescribedFunctionTemplate(FunctionTemplateDecl *Template) {
3655 assert(TemplateOrSpecialization.isNull() &&
3656 "Member function is already a specialization");
3657 TemplateOrSpecialization = Template;
3658 }
3659
isImplicitlyInstantiable() const3660 bool FunctionDecl::isImplicitlyInstantiable() const {
3661 // If the function is invalid, it can't be implicitly instantiated.
3662 if (isInvalidDecl())
3663 return false;
3664
3665 switch (getTemplateSpecializationKindForInstantiation()) {
3666 case TSK_Undeclared:
3667 case TSK_ExplicitInstantiationDefinition:
3668 case TSK_ExplicitSpecialization:
3669 return false;
3670
3671 case TSK_ImplicitInstantiation:
3672 return true;
3673
3674 case TSK_ExplicitInstantiationDeclaration:
3675 // Handled below.
3676 break;
3677 }
3678
3679 // Find the actual template from which we will instantiate.
3680 const FunctionDecl *PatternDecl = getTemplateInstantiationPattern();
3681 bool HasPattern = false;
3682 if (PatternDecl)
3683 HasPattern = PatternDecl->hasBody(PatternDecl);
3684
3685 // C++0x [temp.explicit]p9:
3686 // Except for inline functions, other explicit instantiation declarations
3687 // have the effect of suppressing the implicit instantiation of the entity
3688 // to which they refer.
3689 if (!HasPattern || !PatternDecl)
3690 return true;
3691
3692 return PatternDecl->isInlined();
3693 }
3694
isTemplateInstantiation() const3695 bool FunctionDecl::isTemplateInstantiation() const {
3696 // FIXME: Remove this, it's not clear what it means. (Which template
3697 // specialization kind?)
3698 return clang::isTemplateInstantiation(getTemplateSpecializationKind());
3699 }
3700
3701 FunctionDecl *
getTemplateInstantiationPattern(bool ForDefinition) const3702 FunctionDecl::getTemplateInstantiationPattern(bool ForDefinition) const {
3703 // If this is a generic lambda call operator specialization, its
3704 // instantiation pattern is always its primary template's pattern
3705 // even if its primary template was instantiated from another
3706 // member template (which happens with nested generic lambdas).
3707 // Since a lambda's call operator's body is transformed eagerly,
3708 // we don't have to go hunting for a prototype definition template
3709 // (i.e. instantiated-from-member-template) to use as an instantiation
3710 // pattern.
3711
3712 if (isGenericLambdaCallOperatorSpecialization(
3713 dyn_cast<CXXMethodDecl>(this))) {
3714 assert(getPrimaryTemplate() && "not a generic lambda call operator?");
3715 return getDefinitionOrSelf(getPrimaryTemplate()->getTemplatedDecl());
3716 }
3717
3718 // Check for a declaration of this function that was instantiated from a
3719 // friend definition.
3720 const FunctionDecl *FD = nullptr;
3721 if (!isDefined(FD, /*CheckForPendingFriendDefinition=*/true))
3722 FD = this;
3723
3724 if (MemberSpecializationInfo *Info = FD->getMemberSpecializationInfo()) {
3725 if (ForDefinition &&
3726 !clang::isTemplateInstantiation(Info->getTemplateSpecializationKind()))
3727 return nullptr;
3728 return getDefinitionOrSelf(cast<FunctionDecl>(Info->getInstantiatedFrom()));
3729 }
3730
3731 if (ForDefinition &&
3732 !clang::isTemplateInstantiation(getTemplateSpecializationKind()))
3733 return nullptr;
3734
3735 if (FunctionTemplateDecl *Primary = getPrimaryTemplate()) {
3736 // If we hit a point where the user provided a specialization of this
3737 // template, we're done looking.
3738 while (!ForDefinition || !Primary->isMemberSpecialization()) {
3739 auto *NewPrimary = Primary->getInstantiatedFromMemberTemplate();
3740 if (!NewPrimary)
3741 break;
3742 Primary = NewPrimary;
3743 }
3744
3745 return getDefinitionOrSelf(Primary->getTemplatedDecl());
3746 }
3747
3748 return nullptr;
3749 }
3750
getPrimaryTemplate() const3751 FunctionTemplateDecl *FunctionDecl::getPrimaryTemplate() const {
3752 if (FunctionTemplateSpecializationInfo *Info
3753 = TemplateOrSpecialization
3754 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3755 return Info->getTemplate();
3756 }
3757 return nullptr;
3758 }
3759
3760 FunctionTemplateSpecializationInfo *
getTemplateSpecializationInfo() const3761 FunctionDecl::getTemplateSpecializationInfo() const {
3762 return TemplateOrSpecialization
3763 .dyn_cast<FunctionTemplateSpecializationInfo *>();
3764 }
3765
3766 const TemplateArgumentList *
getTemplateSpecializationArgs() const3767 FunctionDecl::getTemplateSpecializationArgs() const {
3768 if (FunctionTemplateSpecializationInfo *Info
3769 = TemplateOrSpecialization
3770 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3771 return Info->TemplateArguments;
3772 }
3773 return nullptr;
3774 }
3775
3776 const ASTTemplateArgumentListInfo *
getTemplateSpecializationArgsAsWritten() const3777 FunctionDecl::getTemplateSpecializationArgsAsWritten() const {
3778 if (FunctionTemplateSpecializationInfo *Info
3779 = TemplateOrSpecialization
3780 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3781 return Info->TemplateArgumentsAsWritten;
3782 }
3783 return nullptr;
3784 }
3785
3786 void
setFunctionTemplateSpecialization(ASTContext & C,FunctionTemplateDecl * Template,const TemplateArgumentList * TemplateArgs,void * InsertPos,TemplateSpecializationKind TSK,const TemplateArgumentListInfo * TemplateArgsAsWritten,SourceLocation PointOfInstantiation)3787 FunctionDecl::setFunctionTemplateSpecialization(ASTContext &C,
3788 FunctionTemplateDecl *Template,
3789 const TemplateArgumentList *TemplateArgs,
3790 void *InsertPos,
3791 TemplateSpecializationKind TSK,
3792 const TemplateArgumentListInfo *TemplateArgsAsWritten,
3793 SourceLocation PointOfInstantiation) {
3794 assert((TemplateOrSpecialization.isNull() ||
3795 TemplateOrSpecialization.is<MemberSpecializationInfo *>()) &&
3796 "Member function is already a specialization");
3797 assert(TSK != TSK_Undeclared &&
3798 "Must specify the type of function template specialization");
3799 assert((TemplateOrSpecialization.isNull() ||
3800 TSK == TSK_ExplicitSpecialization) &&
3801 "Member specialization must be an explicit specialization");
3802 FunctionTemplateSpecializationInfo *Info =
3803 FunctionTemplateSpecializationInfo::Create(
3804 C, this, Template, TSK, TemplateArgs, TemplateArgsAsWritten,
3805 PointOfInstantiation,
3806 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>());
3807 TemplateOrSpecialization = Info;
3808 Template->addSpecialization(Info, InsertPos);
3809 }
3810
3811 void
setDependentTemplateSpecialization(ASTContext & Context,const UnresolvedSetImpl & Templates,const TemplateArgumentListInfo & TemplateArgs)3812 FunctionDecl::setDependentTemplateSpecialization(ASTContext &Context,
3813 const UnresolvedSetImpl &Templates,
3814 const TemplateArgumentListInfo &TemplateArgs) {
3815 assert(TemplateOrSpecialization.isNull());
3816 DependentFunctionTemplateSpecializationInfo *Info =
3817 DependentFunctionTemplateSpecializationInfo::Create(Context, Templates,
3818 TemplateArgs);
3819 TemplateOrSpecialization = Info;
3820 }
3821
3822 DependentFunctionTemplateSpecializationInfo *
getDependentSpecializationInfo() const3823 FunctionDecl::getDependentSpecializationInfo() const {
3824 return TemplateOrSpecialization
3825 .dyn_cast<DependentFunctionTemplateSpecializationInfo *>();
3826 }
3827
3828 DependentFunctionTemplateSpecializationInfo *
Create(ASTContext & Context,const UnresolvedSetImpl & Ts,const TemplateArgumentListInfo & TArgs)3829 DependentFunctionTemplateSpecializationInfo::Create(
3830 ASTContext &Context, const UnresolvedSetImpl &Ts,
3831 const TemplateArgumentListInfo &TArgs) {
3832 void *Buffer = Context.Allocate(
3833 totalSizeToAlloc<TemplateArgumentLoc, FunctionTemplateDecl *>(
3834 TArgs.size(), Ts.size()));
3835 return new (Buffer) DependentFunctionTemplateSpecializationInfo(Ts, TArgs);
3836 }
3837
3838 DependentFunctionTemplateSpecializationInfo::
DependentFunctionTemplateSpecializationInfo(const UnresolvedSetImpl & Ts,const TemplateArgumentListInfo & TArgs)3839 DependentFunctionTemplateSpecializationInfo(const UnresolvedSetImpl &Ts,
3840 const TemplateArgumentListInfo &TArgs)
3841 : AngleLocs(TArgs.getLAngleLoc(), TArgs.getRAngleLoc()) {
3842 NumTemplates = Ts.size();
3843 NumArgs = TArgs.size();
3844
3845 FunctionTemplateDecl **TsArray = getTrailingObjects<FunctionTemplateDecl *>();
3846 for (unsigned I = 0, E = Ts.size(); I != E; ++I)
3847 TsArray[I] = cast<FunctionTemplateDecl>(Ts[I]->getUnderlyingDecl());
3848
3849 TemplateArgumentLoc *ArgsArray = getTrailingObjects<TemplateArgumentLoc>();
3850 for (unsigned I = 0, E = TArgs.size(); I != E; ++I)
3851 new (&ArgsArray[I]) TemplateArgumentLoc(TArgs[I]);
3852 }
3853
getTemplateSpecializationKind() const3854 TemplateSpecializationKind FunctionDecl::getTemplateSpecializationKind() const {
3855 // For a function template specialization, query the specialization
3856 // information object.
3857 if (FunctionTemplateSpecializationInfo *FTSInfo =
3858 TemplateOrSpecialization
3859 .dyn_cast<FunctionTemplateSpecializationInfo *>())
3860 return FTSInfo->getTemplateSpecializationKind();
3861
3862 if (MemberSpecializationInfo *MSInfo =
3863 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
3864 return MSInfo->getTemplateSpecializationKind();
3865
3866 return TSK_Undeclared;
3867 }
3868
3869 TemplateSpecializationKind
getTemplateSpecializationKindForInstantiation() const3870 FunctionDecl::getTemplateSpecializationKindForInstantiation() const {
3871 // This is the same as getTemplateSpecializationKind(), except that for a
3872 // function that is both a function template specialization and a member
3873 // specialization, we prefer the member specialization information. Eg:
3874 //
3875 // template<typename T> struct A {
3876 // template<typename U> void f() {}
3877 // template<> void f<int>() {}
3878 // };
3879 //
3880 // For A<int>::f<int>():
3881 // * getTemplateSpecializationKind() will return TSK_ExplicitSpecialization
3882 // * getTemplateSpecializationKindForInstantiation() will return
3883 // TSK_ImplicitInstantiation
3884 //
3885 // This reflects the facts that A<int>::f<int> is an explicit specialization
3886 // of A<int>::f, and that A<int>::f<int> should be implicitly instantiated
3887 // from A::f<int> if a definition is needed.
3888 if (FunctionTemplateSpecializationInfo *FTSInfo =
3889 TemplateOrSpecialization
3890 .dyn_cast<FunctionTemplateSpecializationInfo *>()) {
3891 if (auto *MSInfo = FTSInfo->getMemberSpecializationInfo())
3892 return MSInfo->getTemplateSpecializationKind();
3893 return FTSInfo->getTemplateSpecializationKind();
3894 }
3895
3896 if (MemberSpecializationInfo *MSInfo =
3897 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
3898 return MSInfo->getTemplateSpecializationKind();
3899
3900 return TSK_Undeclared;
3901 }
3902
3903 void
setTemplateSpecializationKind(TemplateSpecializationKind TSK,SourceLocation PointOfInstantiation)3904 FunctionDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
3905 SourceLocation PointOfInstantiation) {
3906 if (FunctionTemplateSpecializationInfo *FTSInfo
3907 = TemplateOrSpecialization.dyn_cast<
3908 FunctionTemplateSpecializationInfo*>()) {
3909 FTSInfo->setTemplateSpecializationKind(TSK);
3910 if (TSK != TSK_ExplicitSpecialization &&
3911 PointOfInstantiation.isValid() &&
3912 FTSInfo->getPointOfInstantiation().isInvalid()) {
3913 FTSInfo->setPointOfInstantiation(PointOfInstantiation);
3914 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
3915 L->InstantiationRequested(this);
3916 }
3917 } else if (MemberSpecializationInfo *MSInfo
3918 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>()) {
3919 MSInfo->setTemplateSpecializationKind(TSK);
3920 if (TSK != TSK_ExplicitSpecialization &&
3921 PointOfInstantiation.isValid() &&
3922 MSInfo->getPointOfInstantiation().isInvalid()) {
3923 MSInfo->setPointOfInstantiation(PointOfInstantiation);
3924 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
3925 L->InstantiationRequested(this);
3926 }
3927 } else
3928 llvm_unreachable("Function cannot have a template specialization kind");
3929 }
3930
getPointOfInstantiation() const3931 SourceLocation FunctionDecl::getPointOfInstantiation() const {
3932 if (FunctionTemplateSpecializationInfo *FTSInfo
3933 = TemplateOrSpecialization.dyn_cast<
3934 FunctionTemplateSpecializationInfo*>())
3935 return FTSInfo->getPointOfInstantiation();
3936 if (MemberSpecializationInfo *MSInfo =
3937 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
3938 return MSInfo->getPointOfInstantiation();
3939
3940 return SourceLocation();
3941 }
3942
isOutOfLine() const3943 bool FunctionDecl::isOutOfLine() const {
3944 if (Decl::isOutOfLine())
3945 return true;
3946
3947 // If this function was instantiated from a member function of a
3948 // class template, check whether that member function was defined out-of-line.
3949 if (FunctionDecl *FD = getInstantiatedFromMemberFunction()) {
3950 const FunctionDecl *Definition;
3951 if (FD->hasBody(Definition))
3952 return Definition->isOutOfLine();
3953 }
3954
3955 // If this function was instantiated from a function template,
3956 // check whether that function template was defined out-of-line.
3957 if (FunctionTemplateDecl *FunTmpl = getPrimaryTemplate()) {
3958 const FunctionDecl *Definition;
3959 if (FunTmpl->getTemplatedDecl()->hasBody(Definition))
3960 return Definition->isOutOfLine();
3961 }
3962
3963 return false;
3964 }
3965
getSourceRange() const3966 SourceRange FunctionDecl::getSourceRange() const {
3967 return SourceRange(getOuterLocStart(), EndRangeLoc);
3968 }
3969
getMemoryFunctionKind() const3970 unsigned FunctionDecl::getMemoryFunctionKind() const {
3971 IdentifierInfo *FnInfo = getIdentifier();
3972
3973 if (!FnInfo)
3974 return 0;
3975
3976 // Builtin handling.
3977 switch (getBuiltinID()) {
3978 case Builtin::BI__builtin_memset:
3979 case Builtin::BI__builtin___memset_chk:
3980 case Builtin::BImemset:
3981 return Builtin::BImemset;
3982
3983 case Builtin::BI__builtin_memcpy:
3984 case Builtin::BI__builtin___memcpy_chk:
3985 case Builtin::BImemcpy:
3986 return Builtin::BImemcpy;
3987
3988 case Builtin::BI__builtin_mempcpy:
3989 case Builtin::BI__builtin___mempcpy_chk:
3990 case Builtin::BImempcpy:
3991 return Builtin::BImempcpy;
3992
3993 case Builtin::BI__builtin_memmove:
3994 case Builtin::BI__builtin___memmove_chk:
3995 case Builtin::BImemmove:
3996 return Builtin::BImemmove;
3997
3998 case Builtin::BIstrlcpy:
3999 case Builtin::BI__builtin___strlcpy_chk:
4000 return Builtin::BIstrlcpy;
4001
4002 case Builtin::BIstrlcat:
4003 case Builtin::BI__builtin___strlcat_chk:
4004 return Builtin::BIstrlcat;
4005
4006 case Builtin::BI__builtin_memcmp:
4007 case Builtin::BImemcmp:
4008 return Builtin::BImemcmp;
4009
4010 case Builtin::BI__builtin_bcmp:
4011 case Builtin::BIbcmp:
4012 return Builtin::BIbcmp;
4013
4014 case Builtin::BI__builtin_strncpy:
4015 case Builtin::BI__builtin___strncpy_chk:
4016 case Builtin::BIstrncpy:
4017 return Builtin::BIstrncpy;
4018
4019 case Builtin::BI__builtin_strncmp:
4020 case Builtin::BIstrncmp:
4021 return Builtin::BIstrncmp;
4022
4023 case Builtin::BI__builtin_strncasecmp:
4024 case Builtin::BIstrncasecmp:
4025 return Builtin::BIstrncasecmp;
4026
4027 case Builtin::BI__builtin_strncat:
4028 case Builtin::BI__builtin___strncat_chk:
4029 case Builtin::BIstrncat:
4030 return Builtin::BIstrncat;
4031
4032 case Builtin::BI__builtin_strndup:
4033 case Builtin::BIstrndup:
4034 return Builtin::BIstrndup;
4035
4036 case Builtin::BI__builtin_strlen:
4037 case Builtin::BIstrlen:
4038 return Builtin::BIstrlen;
4039
4040 case Builtin::BI__builtin_bzero:
4041 case Builtin::BIbzero:
4042 return Builtin::BIbzero;
4043
4044 case Builtin::BIfree:
4045 return Builtin::BIfree;
4046
4047 default:
4048 if (isExternC()) {
4049 if (FnInfo->isStr("memset"))
4050 return Builtin::BImemset;
4051 if (FnInfo->isStr("memcpy"))
4052 return Builtin::BImemcpy;
4053 if (FnInfo->isStr("mempcpy"))
4054 return Builtin::BImempcpy;
4055 if (FnInfo->isStr("memmove"))
4056 return Builtin::BImemmove;
4057 if (FnInfo->isStr("memcmp"))
4058 return Builtin::BImemcmp;
4059 if (FnInfo->isStr("bcmp"))
4060 return Builtin::BIbcmp;
4061 if (FnInfo->isStr("strncpy"))
4062 return Builtin::BIstrncpy;
4063 if (FnInfo->isStr("strncmp"))
4064 return Builtin::BIstrncmp;
4065 if (FnInfo->isStr("strncasecmp"))
4066 return Builtin::BIstrncasecmp;
4067 if (FnInfo->isStr("strncat"))
4068 return Builtin::BIstrncat;
4069 if (FnInfo->isStr("strndup"))
4070 return Builtin::BIstrndup;
4071 if (FnInfo->isStr("strlen"))
4072 return Builtin::BIstrlen;
4073 if (FnInfo->isStr("bzero"))
4074 return Builtin::BIbzero;
4075 } else if (isInStdNamespace()) {
4076 if (FnInfo->isStr("free"))
4077 return Builtin::BIfree;
4078 }
4079 break;
4080 }
4081 return 0;
4082 }
4083
getODRHash() const4084 unsigned FunctionDecl::getODRHash() const {
4085 assert(hasODRHash());
4086 return ODRHash;
4087 }
4088
getODRHash()4089 unsigned FunctionDecl::getODRHash() {
4090 if (hasODRHash())
4091 return ODRHash;
4092
4093 if (auto *FT = getInstantiatedFromMemberFunction()) {
4094 setHasODRHash(true);
4095 ODRHash = FT->getODRHash();
4096 return ODRHash;
4097 }
4098
4099 class ODRHash Hash;
4100 Hash.AddFunctionDecl(this);
4101 setHasODRHash(true);
4102 ODRHash = Hash.CalculateHash();
4103 return ODRHash;
4104 }
4105
4106 //===----------------------------------------------------------------------===//
4107 // FieldDecl Implementation
4108 //===----------------------------------------------------------------------===//
4109
Create(const ASTContext & C,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,IdentifierInfo * Id,QualType T,TypeSourceInfo * TInfo,Expr * BW,bool Mutable,InClassInitStyle InitStyle)4110 FieldDecl *FieldDecl::Create(const ASTContext &C, DeclContext *DC,
4111 SourceLocation StartLoc, SourceLocation IdLoc,
4112 IdentifierInfo *Id, QualType T,
4113 TypeSourceInfo *TInfo, Expr *BW, bool Mutable,
4114 InClassInitStyle InitStyle) {
4115 return new (C, DC) FieldDecl(Decl::Field, DC, StartLoc, IdLoc, Id, T, TInfo,
4116 BW, Mutable, InitStyle);
4117 }
4118
CreateDeserialized(ASTContext & C,unsigned ID)4119 FieldDecl *FieldDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4120 return new (C, ID) FieldDecl(Field, nullptr, SourceLocation(),
4121 SourceLocation(), nullptr, QualType(), nullptr,
4122 nullptr, false, ICIS_NoInit);
4123 }
4124
isAnonymousStructOrUnion() const4125 bool FieldDecl::isAnonymousStructOrUnion() const {
4126 if (!isImplicit() || getDeclName())
4127 return false;
4128
4129 if (const auto *Record = getType()->getAs<RecordType>())
4130 return Record->getDecl()->isAnonymousStructOrUnion();
4131
4132 return false;
4133 }
4134
getBitWidthValue(const ASTContext & Ctx) const4135 unsigned FieldDecl::getBitWidthValue(const ASTContext &Ctx) const {
4136 assert(isBitField() && "not a bitfield");
4137 return getBitWidth()->EvaluateKnownConstInt(Ctx).getZExtValue();
4138 }
4139
isZeroLengthBitField(const ASTContext & Ctx) const4140 bool FieldDecl::isZeroLengthBitField(const ASTContext &Ctx) const {
4141 return isUnnamedBitfield() && !getBitWidth()->isValueDependent() &&
4142 getBitWidthValue(Ctx) == 0;
4143 }
4144
isZeroSize(const ASTContext & Ctx) const4145 bool FieldDecl::isZeroSize(const ASTContext &Ctx) const {
4146 if (isZeroLengthBitField(Ctx))
4147 return true;
4148
4149 // C++2a [intro.object]p7:
4150 // An object has nonzero size if it
4151 // -- is not a potentially-overlapping subobject, or
4152 if (!hasAttr<NoUniqueAddressAttr>())
4153 return false;
4154
4155 // -- is not of class type, or
4156 const auto *RT = getType()->getAs<RecordType>();
4157 if (!RT)
4158 return false;
4159 const RecordDecl *RD = RT->getDecl()->getDefinition();
4160 if (!RD) {
4161 assert(isInvalidDecl() && "valid field has incomplete type");
4162 return false;
4163 }
4164
4165 // -- [has] virtual member functions or virtual base classes, or
4166 // -- has subobjects of nonzero size or bit-fields of nonzero length
4167 const auto *CXXRD = cast<CXXRecordDecl>(RD);
4168 if (!CXXRD->isEmpty())
4169 return false;
4170
4171 // Otherwise, [...] the circumstances under which the object has zero size
4172 // are implementation-defined.
4173 // FIXME: This might be Itanium ABI specific; we don't yet know what the MS
4174 // ABI will do.
4175 return true;
4176 }
4177
getFieldIndex() const4178 unsigned FieldDecl::getFieldIndex() const {
4179 const FieldDecl *Canonical = getCanonicalDecl();
4180 if (Canonical != this)
4181 return Canonical->getFieldIndex();
4182
4183 if (CachedFieldIndex) return CachedFieldIndex - 1;
4184
4185 unsigned Index = 0;
4186 const RecordDecl *RD = getParent()->getDefinition();
4187 assert(RD && "requested index for field of struct with no definition");
4188
4189 for (auto *Field : RD->fields()) {
4190 Field->getCanonicalDecl()->CachedFieldIndex = Index + 1;
4191 ++Index;
4192 }
4193
4194 assert(CachedFieldIndex && "failed to find field in parent");
4195 return CachedFieldIndex - 1;
4196 }
4197
getSourceRange() const4198 SourceRange FieldDecl::getSourceRange() const {
4199 const Expr *FinalExpr = getInClassInitializer();
4200 if (!FinalExpr)
4201 FinalExpr = getBitWidth();
4202 if (FinalExpr)
4203 return SourceRange(getInnerLocStart(), FinalExpr->getEndLoc());
4204 return DeclaratorDecl::getSourceRange();
4205 }
4206
setCapturedVLAType(const VariableArrayType * VLAType)4207 void FieldDecl::setCapturedVLAType(const VariableArrayType *VLAType) {
4208 assert((getParent()->isLambda() || getParent()->isCapturedRecord()) &&
4209 "capturing type in non-lambda or captured record.");
4210 assert(InitStorage.getInt() == ISK_NoInit &&
4211 InitStorage.getPointer() == nullptr &&
4212 "bit width, initializer or captured type already set");
4213 InitStorage.setPointerAndInt(const_cast<VariableArrayType *>(VLAType),
4214 ISK_CapturedVLAType);
4215 }
4216
4217 //===----------------------------------------------------------------------===//
4218 // TagDecl Implementation
4219 //===----------------------------------------------------------------------===//
4220
TagDecl(Kind DK,TagKind TK,const ASTContext & C,DeclContext * DC,SourceLocation L,IdentifierInfo * Id,TagDecl * PrevDecl,SourceLocation StartL)4221 TagDecl::TagDecl(Kind DK, TagKind TK, const ASTContext &C, DeclContext *DC,
4222 SourceLocation L, IdentifierInfo *Id, TagDecl *PrevDecl,
4223 SourceLocation StartL)
4224 : TypeDecl(DK, DC, L, Id, StartL), DeclContext(DK), redeclarable_base(C),
4225 TypedefNameDeclOrQualifier((TypedefNameDecl *)nullptr) {
4226 assert((DK != Enum || TK == TTK_Enum) &&
4227 "EnumDecl not matched with TTK_Enum");
4228 setPreviousDecl(PrevDecl);
4229 setTagKind(TK);
4230 setCompleteDefinition(false);
4231 setBeingDefined(false);
4232 setEmbeddedInDeclarator(false);
4233 setFreeStanding(false);
4234 setCompleteDefinitionRequired(false);
4235 }
4236
getOuterLocStart() const4237 SourceLocation TagDecl::getOuterLocStart() const {
4238 return getTemplateOrInnerLocStart(this);
4239 }
4240
getSourceRange() const4241 SourceRange TagDecl::getSourceRange() const {
4242 SourceLocation RBraceLoc = BraceRange.getEnd();
4243 SourceLocation E = RBraceLoc.isValid() ? RBraceLoc : getLocation();
4244 return SourceRange(getOuterLocStart(), E);
4245 }
4246
getCanonicalDecl()4247 TagDecl *TagDecl::getCanonicalDecl() { return getFirstDecl(); }
4248
setTypedefNameForAnonDecl(TypedefNameDecl * TDD)4249 void TagDecl::setTypedefNameForAnonDecl(TypedefNameDecl *TDD) {
4250 TypedefNameDeclOrQualifier = TDD;
4251 if (const Type *T = getTypeForDecl()) {
4252 (void)T;
4253 assert(T->isLinkageValid());
4254 }
4255 assert(isLinkageValid());
4256 }
4257
startDefinition()4258 void TagDecl::startDefinition() {
4259 setBeingDefined(true);
4260
4261 if (auto *D = dyn_cast<CXXRecordDecl>(this)) {
4262 struct CXXRecordDecl::DefinitionData *Data =
4263 new (getASTContext()) struct CXXRecordDecl::DefinitionData(D);
4264 for (auto I : redecls())
4265 cast<CXXRecordDecl>(I)->DefinitionData = Data;
4266 }
4267 }
4268
completeDefinition()4269 void TagDecl::completeDefinition() {
4270 assert((!isa<CXXRecordDecl>(this) ||
4271 cast<CXXRecordDecl>(this)->hasDefinition()) &&
4272 "definition completed but not started");
4273
4274 setCompleteDefinition(true);
4275 setBeingDefined(false);
4276
4277 if (ASTMutationListener *L = getASTMutationListener())
4278 L->CompletedTagDefinition(this);
4279 }
4280
getDefinition() const4281 TagDecl *TagDecl::getDefinition() const {
4282 if (isCompleteDefinition())
4283 return const_cast<TagDecl *>(this);
4284
4285 // If it's possible for us to have an out-of-date definition, check now.
4286 if (mayHaveOutOfDateDef()) {
4287 if (IdentifierInfo *II = getIdentifier()) {
4288 if (II->isOutOfDate()) {
4289 updateOutOfDate(*II);
4290 }
4291 }
4292 }
4293
4294 if (const auto *CXXRD = dyn_cast<CXXRecordDecl>(this))
4295 return CXXRD->getDefinition();
4296
4297 for (auto R : redecls())
4298 if (R->isCompleteDefinition())
4299 return R;
4300
4301 return nullptr;
4302 }
4303
setQualifierInfo(NestedNameSpecifierLoc QualifierLoc)4304 void TagDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) {
4305 if (QualifierLoc) {
4306 // Make sure the extended qualifier info is allocated.
4307 if (!hasExtInfo())
4308 TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo;
4309 // Set qualifier info.
4310 getExtInfo()->QualifierLoc = QualifierLoc;
4311 } else {
4312 // Here Qualifier == 0, i.e., we are removing the qualifier (if any).
4313 if (hasExtInfo()) {
4314 if (getExtInfo()->NumTemplParamLists == 0) {
4315 getASTContext().Deallocate(getExtInfo());
4316 TypedefNameDeclOrQualifier = (TypedefNameDecl *)nullptr;
4317 }
4318 else
4319 getExtInfo()->QualifierLoc = QualifierLoc;
4320 }
4321 }
4322 }
4323
setTemplateParameterListsInfo(ASTContext & Context,ArrayRef<TemplateParameterList * > TPLists)4324 void TagDecl::setTemplateParameterListsInfo(
4325 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
4326 assert(!TPLists.empty());
4327 // Make sure the extended decl info is allocated.
4328 if (!hasExtInfo())
4329 // Allocate external info struct.
4330 TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo;
4331 // Set the template parameter lists info.
4332 getExtInfo()->setTemplateParameterListsInfo(Context, TPLists);
4333 }
4334
4335 //===----------------------------------------------------------------------===//
4336 // EnumDecl Implementation
4337 //===----------------------------------------------------------------------===//
4338
EnumDecl(ASTContext & C,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,IdentifierInfo * Id,EnumDecl * PrevDecl,bool Scoped,bool ScopedUsingClassTag,bool Fixed)4339 EnumDecl::EnumDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
4340 SourceLocation IdLoc, IdentifierInfo *Id, EnumDecl *PrevDecl,
4341 bool Scoped, bool ScopedUsingClassTag, bool Fixed)
4342 : TagDecl(Enum, TTK_Enum, C, DC, IdLoc, Id, PrevDecl, StartLoc) {
4343 assert(Scoped || !ScopedUsingClassTag);
4344 IntegerType = nullptr;
4345 setNumPositiveBits(0);
4346 setNumNegativeBits(0);
4347 setScoped(Scoped);
4348 setScopedUsingClassTag(ScopedUsingClassTag);
4349 setFixed(Fixed);
4350 setHasODRHash(false);
4351 ODRHash = 0;
4352 }
4353
anchor()4354 void EnumDecl::anchor() {}
4355
Create(ASTContext & C,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,IdentifierInfo * Id,EnumDecl * PrevDecl,bool IsScoped,bool IsScopedUsingClassTag,bool IsFixed)4356 EnumDecl *EnumDecl::Create(ASTContext &C, DeclContext *DC,
4357 SourceLocation StartLoc, SourceLocation IdLoc,
4358 IdentifierInfo *Id,
4359 EnumDecl *PrevDecl, bool IsScoped,
4360 bool IsScopedUsingClassTag, bool IsFixed) {
4361 auto *Enum = new (C, DC) EnumDecl(C, DC, StartLoc, IdLoc, Id, PrevDecl,
4362 IsScoped, IsScopedUsingClassTag, IsFixed);
4363 Enum->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4364 C.getTypeDeclType(Enum, PrevDecl);
4365 return Enum;
4366 }
4367
CreateDeserialized(ASTContext & C,unsigned ID)4368 EnumDecl *EnumDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4369 EnumDecl *Enum =
4370 new (C, ID) EnumDecl(C, nullptr, SourceLocation(), SourceLocation(),
4371 nullptr, nullptr, false, false, false);
4372 Enum->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4373 return Enum;
4374 }
4375
getIntegerTypeRange() const4376 SourceRange EnumDecl::getIntegerTypeRange() const {
4377 if (const TypeSourceInfo *TI = getIntegerTypeSourceInfo())
4378 return TI->getTypeLoc().getSourceRange();
4379 return SourceRange();
4380 }
4381
completeDefinition(QualType NewType,QualType NewPromotionType,unsigned NumPositiveBits,unsigned NumNegativeBits)4382 void EnumDecl::completeDefinition(QualType NewType,
4383 QualType NewPromotionType,
4384 unsigned NumPositiveBits,
4385 unsigned NumNegativeBits) {
4386 assert(!isCompleteDefinition() && "Cannot redefine enums!");
4387 if (!IntegerType)
4388 IntegerType = NewType.getTypePtr();
4389 PromotionType = NewPromotionType;
4390 setNumPositiveBits(NumPositiveBits);
4391 setNumNegativeBits(NumNegativeBits);
4392 TagDecl::completeDefinition();
4393 }
4394
isClosed() const4395 bool EnumDecl::isClosed() const {
4396 if (const auto *A = getAttr<EnumExtensibilityAttr>())
4397 return A->getExtensibility() == EnumExtensibilityAttr::Closed;
4398 return true;
4399 }
4400
isClosedFlag() const4401 bool EnumDecl::isClosedFlag() const {
4402 return isClosed() && hasAttr<FlagEnumAttr>();
4403 }
4404
isClosedNonFlag() const4405 bool EnumDecl::isClosedNonFlag() const {
4406 return isClosed() && !hasAttr<FlagEnumAttr>();
4407 }
4408
getTemplateSpecializationKind() const4409 TemplateSpecializationKind EnumDecl::getTemplateSpecializationKind() const {
4410 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
4411 return MSI->getTemplateSpecializationKind();
4412
4413 return TSK_Undeclared;
4414 }
4415
setTemplateSpecializationKind(TemplateSpecializationKind TSK,SourceLocation PointOfInstantiation)4416 void EnumDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
4417 SourceLocation PointOfInstantiation) {
4418 MemberSpecializationInfo *MSI = getMemberSpecializationInfo();
4419 assert(MSI && "Not an instantiated member enumeration?");
4420 MSI->setTemplateSpecializationKind(TSK);
4421 if (TSK != TSK_ExplicitSpecialization &&
4422 PointOfInstantiation.isValid() &&
4423 MSI->getPointOfInstantiation().isInvalid())
4424 MSI->setPointOfInstantiation(PointOfInstantiation);
4425 }
4426
getTemplateInstantiationPattern() const4427 EnumDecl *EnumDecl::getTemplateInstantiationPattern() const {
4428 if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo()) {
4429 if (isTemplateInstantiation(MSInfo->getTemplateSpecializationKind())) {
4430 EnumDecl *ED = getInstantiatedFromMemberEnum();
4431 while (auto *NewED = ED->getInstantiatedFromMemberEnum())
4432 ED = NewED;
4433 return getDefinitionOrSelf(ED);
4434 }
4435 }
4436
4437 assert(!isTemplateInstantiation(getTemplateSpecializationKind()) &&
4438 "couldn't find pattern for enum instantiation");
4439 return nullptr;
4440 }
4441
getInstantiatedFromMemberEnum() const4442 EnumDecl *EnumDecl::getInstantiatedFromMemberEnum() const {
4443 if (SpecializationInfo)
4444 return cast<EnumDecl>(SpecializationInfo->getInstantiatedFrom());
4445
4446 return nullptr;
4447 }
4448
setInstantiationOfMemberEnum(ASTContext & C,EnumDecl * ED,TemplateSpecializationKind TSK)4449 void EnumDecl::setInstantiationOfMemberEnum(ASTContext &C, EnumDecl *ED,
4450 TemplateSpecializationKind TSK) {
4451 assert(!SpecializationInfo && "Member enum is already a specialization");
4452 SpecializationInfo = new (C) MemberSpecializationInfo(ED, TSK);
4453 }
4454
getODRHash()4455 unsigned EnumDecl::getODRHash() {
4456 if (hasODRHash())
4457 return ODRHash;
4458
4459 class ODRHash Hash;
4460 Hash.AddEnumDecl(this);
4461 setHasODRHash(true);
4462 ODRHash = Hash.CalculateHash();
4463 return ODRHash;
4464 }
4465
4466 //===----------------------------------------------------------------------===//
4467 // RecordDecl Implementation
4468 //===----------------------------------------------------------------------===//
4469
RecordDecl(Kind DK,TagKind TK,const ASTContext & C,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,IdentifierInfo * Id,RecordDecl * PrevDecl)4470 RecordDecl::RecordDecl(Kind DK, TagKind TK, const ASTContext &C,
4471 DeclContext *DC, SourceLocation StartLoc,
4472 SourceLocation IdLoc, IdentifierInfo *Id,
4473 RecordDecl *PrevDecl)
4474 : TagDecl(DK, TK, C, DC, IdLoc, Id, PrevDecl, StartLoc) {
4475 assert(classof(static_cast<Decl *>(this)) && "Invalid Kind!");
4476 setHasFlexibleArrayMember(false);
4477 setAnonymousStructOrUnion(false);
4478 setHasObjectMember(false);
4479 setHasVolatileMember(false);
4480 setHasLoadedFieldsFromExternalStorage(false);
4481 setNonTrivialToPrimitiveDefaultInitialize(false);
4482 setNonTrivialToPrimitiveCopy(false);
4483 setNonTrivialToPrimitiveDestroy(false);
4484 setHasNonTrivialToPrimitiveDefaultInitializeCUnion(false);
4485 setHasNonTrivialToPrimitiveDestructCUnion(false);
4486 setHasNonTrivialToPrimitiveCopyCUnion(false);
4487 setParamDestroyedInCallee(false);
4488 setArgPassingRestrictions(APK_CanPassInRegs);
4489 }
4490
Create(const ASTContext & C,TagKind TK,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,IdentifierInfo * Id,RecordDecl * PrevDecl)4491 RecordDecl *RecordDecl::Create(const ASTContext &C, TagKind TK, DeclContext *DC,
4492 SourceLocation StartLoc, SourceLocation IdLoc,
4493 IdentifierInfo *Id, RecordDecl* PrevDecl) {
4494 RecordDecl *R = new (C, DC) RecordDecl(Record, TK, C, DC,
4495 StartLoc, IdLoc, Id, PrevDecl);
4496 R->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4497
4498 C.getTypeDeclType(R, PrevDecl);
4499 return R;
4500 }
4501
CreateDeserialized(const ASTContext & C,unsigned ID)4502 RecordDecl *RecordDecl::CreateDeserialized(const ASTContext &C, unsigned ID) {
4503 RecordDecl *R =
4504 new (C, ID) RecordDecl(Record, TTK_Struct, C, nullptr, SourceLocation(),
4505 SourceLocation(), nullptr, nullptr);
4506 R->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4507 return R;
4508 }
4509
isInjectedClassName() const4510 bool RecordDecl::isInjectedClassName() const {
4511 return isImplicit() && getDeclName() && getDeclContext()->isRecord() &&
4512 cast<RecordDecl>(getDeclContext())->getDeclName() == getDeclName();
4513 }
4514
isLambda() const4515 bool RecordDecl::isLambda() const {
4516 if (auto RD = dyn_cast<CXXRecordDecl>(this))
4517 return RD->isLambda();
4518 return false;
4519 }
4520
isCapturedRecord() const4521 bool RecordDecl::isCapturedRecord() const {
4522 return hasAttr<CapturedRecordAttr>();
4523 }
4524
setCapturedRecord()4525 void RecordDecl::setCapturedRecord() {
4526 addAttr(CapturedRecordAttr::CreateImplicit(getASTContext()));
4527 }
4528
isOrContainsUnion() const4529 bool RecordDecl::isOrContainsUnion() const {
4530 if (isUnion())
4531 return true;
4532
4533 if (const RecordDecl *Def = getDefinition()) {
4534 for (const FieldDecl *FD : Def->fields()) {
4535 const RecordType *RT = FD->getType()->getAs<RecordType>();
4536 if (RT && RT->getDecl()->isOrContainsUnion())
4537 return true;
4538 }
4539 }
4540
4541 return false;
4542 }
4543
field_begin() const4544 RecordDecl::field_iterator RecordDecl::field_begin() const {
4545 if (hasExternalLexicalStorage() && !hasLoadedFieldsFromExternalStorage())
4546 LoadFieldsFromExternalStorage();
4547
4548 return field_iterator(decl_iterator(FirstDecl));
4549 }
4550
4551 /// completeDefinition - Notes that the definition of this type is now
4552 /// complete.
completeDefinition()4553 void RecordDecl::completeDefinition() {
4554 assert(!isCompleteDefinition() && "Cannot redefine record!");
4555 TagDecl::completeDefinition();
4556 }
4557
4558 /// isMsStruct - Get whether or not this record uses ms_struct layout.
4559 /// This which can be turned on with an attribute, pragma, or the
4560 /// -mms-bitfields command-line option.
isMsStruct(const ASTContext & C) const4561 bool RecordDecl::isMsStruct(const ASTContext &C) const {
4562 return hasAttr<MSStructAttr>() || C.getLangOpts().MSBitfields == 1;
4563 }
4564
LoadFieldsFromExternalStorage() const4565 void RecordDecl::LoadFieldsFromExternalStorage() const {
4566 ExternalASTSource *Source = getASTContext().getExternalSource();
4567 assert(hasExternalLexicalStorage() && Source && "No external storage?");
4568
4569 // Notify that we have a RecordDecl doing some initialization.
4570 ExternalASTSource::Deserializing TheFields(Source);
4571
4572 SmallVector<Decl*, 64> Decls;
4573 setHasLoadedFieldsFromExternalStorage(true);
4574 Source->FindExternalLexicalDecls(this, [](Decl::Kind K) {
4575 return FieldDecl::classofKind(K) || IndirectFieldDecl::classofKind(K);
4576 }, Decls);
4577
4578 #ifndef NDEBUG
4579 // Check that all decls we got were FieldDecls.
4580 for (unsigned i=0, e=Decls.size(); i != e; ++i)
4581 assert(isa<FieldDecl>(Decls[i]) || isa<IndirectFieldDecl>(Decls[i]));
4582 #endif
4583
4584 if (Decls.empty())
4585 return;
4586
4587 std::tie(FirstDecl, LastDecl) = BuildDeclChain(Decls,
4588 /*FieldsAlreadyLoaded=*/false);
4589 }
4590
mayInsertExtraPadding(bool EmitRemark) const4591 bool RecordDecl::mayInsertExtraPadding(bool EmitRemark) const {
4592 ASTContext &Context = getASTContext();
4593 const SanitizerMask EnabledAsanMask = Context.getLangOpts().Sanitize.Mask &
4594 (SanitizerKind::Address | SanitizerKind::KernelAddress);
4595 if (!EnabledAsanMask || !Context.getLangOpts().SanitizeAddressFieldPadding)
4596 return false;
4597 const auto &Blacklist = Context.getSanitizerBlacklist();
4598 const auto *CXXRD = dyn_cast<CXXRecordDecl>(this);
4599 // We may be able to relax some of these requirements.
4600 int ReasonToReject = -1;
4601 if (!CXXRD || CXXRD->isExternCContext())
4602 ReasonToReject = 0; // is not C++.
4603 else if (CXXRD->hasAttr<PackedAttr>())
4604 ReasonToReject = 1; // is packed.
4605 else if (CXXRD->isUnion())
4606 ReasonToReject = 2; // is a union.
4607 else if (CXXRD->isTriviallyCopyable())
4608 ReasonToReject = 3; // is trivially copyable.
4609 else if (CXXRD->hasTrivialDestructor())
4610 ReasonToReject = 4; // has trivial destructor.
4611 else if (CXXRD->isStandardLayout())
4612 ReasonToReject = 5; // is standard layout.
4613 else if (Blacklist.isBlacklistedLocation(EnabledAsanMask, getLocation(),
4614 "field-padding"))
4615 ReasonToReject = 6; // is in an excluded file.
4616 else if (Blacklist.isBlacklistedType(EnabledAsanMask,
4617 getQualifiedNameAsString(),
4618 "field-padding"))
4619 ReasonToReject = 7; // The type is excluded.
4620
4621 if (EmitRemark) {
4622 if (ReasonToReject >= 0)
4623 Context.getDiagnostics().Report(
4624 getLocation(),
4625 diag::remark_sanitize_address_insert_extra_padding_rejected)
4626 << getQualifiedNameAsString() << ReasonToReject;
4627 else
4628 Context.getDiagnostics().Report(
4629 getLocation(),
4630 diag::remark_sanitize_address_insert_extra_padding_accepted)
4631 << getQualifiedNameAsString();
4632 }
4633 return ReasonToReject < 0;
4634 }
4635
findFirstNamedDataMember() const4636 const FieldDecl *RecordDecl::findFirstNamedDataMember() const {
4637 for (const auto *I : fields()) {
4638 if (I->getIdentifier())
4639 return I;
4640
4641 if (const auto *RT = I->getType()->getAs<RecordType>())
4642 if (const FieldDecl *NamedDataMember =
4643 RT->getDecl()->findFirstNamedDataMember())
4644 return NamedDataMember;
4645 }
4646
4647 // We didn't find a named data member.
4648 return nullptr;
4649 }
4650
4651 //===----------------------------------------------------------------------===//
4652 // BlockDecl Implementation
4653 //===----------------------------------------------------------------------===//
4654
BlockDecl(DeclContext * DC,SourceLocation CaretLoc)4655 BlockDecl::BlockDecl(DeclContext *DC, SourceLocation CaretLoc)
4656 : Decl(Block, DC, CaretLoc), DeclContext(Block) {
4657 setIsVariadic(false);
4658 setCapturesCXXThis(false);
4659 setBlockMissingReturnType(true);
4660 setIsConversionFromLambda(false);
4661 setDoesNotEscape(false);
4662 setCanAvoidCopyToHeap(false);
4663 }
4664
setParams(ArrayRef<ParmVarDecl * > NewParamInfo)4665 void BlockDecl::setParams(ArrayRef<ParmVarDecl *> NewParamInfo) {
4666 assert(!ParamInfo && "Already has param info!");
4667
4668 // Zero params -> null pointer.
4669 if (!NewParamInfo.empty()) {
4670 NumParams = NewParamInfo.size();
4671 ParamInfo = new (getASTContext()) ParmVarDecl*[NewParamInfo.size()];
4672 std::copy(NewParamInfo.begin(), NewParamInfo.end(), ParamInfo);
4673 }
4674 }
4675
setCaptures(ASTContext & Context,ArrayRef<Capture> Captures,bool CapturesCXXThis)4676 void BlockDecl::setCaptures(ASTContext &Context, ArrayRef<Capture> Captures,
4677 bool CapturesCXXThis) {
4678 this->setCapturesCXXThis(CapturesCXXThis);
4679 this->NumCaptures = Captures.size();
4680
4681 if (Captures.empty()) {
4682 this->Captures = nullptr;
4683 return;
4684 }
4685
4686 this->Captures = Captures.copy(Context).data();
4687 }
4688
capturesVariable(const VarDecl * variable) const4689 bool BlockDecl::capturesVariable(const VarDecl *variable) const {
4690 for (const auto &I : captures())
4691 // Only auto vars can be captured, so no redeclaration worries.
4692 if (I.getVariable() == variable)
4693 return true;
4694
4695 return false;
4696 }
4697
getSourceRange() const4698 SourceRange BlockDecl::getSourceRange() const {
4699 return SourceRange(getLocation(), Body ? Body->getEndLoc() : getLocation());
4700 }
4701
4702 //===----------------------------------------------------------------------===//
4703 // Other Decl Allocation/Deallocation Method Implementations
4704 //===----------------------------------------------------------------------===//
4705
anchor()4706 void TranslationUnitDecl::anchor() {}
4707
Create(ASTContext & C)4708 TranslationUnitDecl *TranslationUnitDecl::Create(ASTContext &C) {
4709 return new (C, (DeclContext *)nullptr) TranslationUnitDecl(C);
4710 }
4711
anchor()4712 void PragmaCommentDecl::anchor() {}
4713
Create(const ASTContext & C,TranslationUnitDecl * DC,SourceLocation CommentLoc,PragmaMSCommentKind CommentKind,StringRef Arg)4714 PragmaCommentDecl *PragmaCommentDecl::Create(const ASTContext &C,
4715 TranslationUnitDecl *DC,
4716 SourceLocation CommentLoc,
4717 PragmaMSCommentKind CommentKind,
4718 StringRef Arg) {
4719 PragmaCommentDecl *PCD =
4720 new (C, DC, additionalSizeToAlloc<char>(Arg.size() + 1))
4721 PragmaCommentDecl(DC, CommentLoc, CommentKind);
4722 memcpy(PCD->getTrailingObjects<char>(), Arg.data(), Arg.size());
4723 PCD->getTrailingObjects<char>()[Arg.size()] = '\0';
4724 return PCD;
4725 }
4726
CreateDeserialized(ASTContext & C,unsigned ID,unsigned ArgSize)4727 PragmaCommentDecl *PragmaCommentDecl::CreateDeserialized(ASTContext &C,
4728 unsigned ID,
4729 unsigned ArgSize) {
4730 return new (C, ID, additionalSizeToAlloc<char>(ArgSize + 1))
4731 PragmaCommentDecl(nullptr, SourceLocation(), PCK_Unknown);
4732 }
4733
anchor()4734 void PragmaDetectMismatchDecl::anchor() {}
4735
4736 PragmaDetectMismatchDecl *
Create(const ASTContext & C,TranslationUnitDecl * DC,SourceLocation Loc,StringRef Name,StringRef Value)4737 PragmaDetectMismatchDecl::Create(const ASTContext &C, TranslationUnitDecl *DC,
4738 SourceLocation Loc, StringRef Name,
4739 StringRef Value) {
4740 size_t ValueStart = Name.size() + 1;
4741 PragmaDetectMismatchDecl *PDMD =
4742 new (C, DC, additionalSizeToAlloc<char>(ValueStart + Value.size() + 1))
4743 PragmaDetectMismatchDecl(DC, Loc, ValueStart);
4744 memcpy(PDMD->getTrailingObjects<char>(), Name.data(), Name.size());
4745 PDMD->getTrailingObjects<char>()[Name.size()] = '\0';
4746 memcpy(PDMD->getTrailingObjects<char>() + ValueStart, Value.data(),
4747 Value.size());
4748 PDMD->getTrailingObjects<char>()[ValueStart + Value.size()] = '\0';
4749 return PDMD;
4750 }
4751
4752 PragmaDetectMismatchDecl *
CreateDeserialized(ASTContext & C,unsigned ID,unsigned NameValueSize)4753 PragmaDetectMismatchDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4754 unsigned NameValueSize) {
4755 return new (C, ID, additionalSizeToAlloc<char>(NameValueSize + 1))
4756 PragmaDetectMismatchDecl(nullptr, SourceLocation(), 0);
4757 }
4758
anchor()4759 void ExternCContextDecl::anchor() {}
4760
Create(const ASTContext & C,TranslationUnitDecl * DC)4761 ExternCContextDecl *ExternCContextDecl::Create(const ASTContext &C,
4762 TranslationUnitDecl *DC) {
4763 return new (C, DC) ExternCContextDecl(DC);
4764 }
4765
anchor()4766 void LabelDecl::anchor() {}
4767
Create(ASTContext & C,DeclContext * DC,SourceLocation IdentL,IdentifierInfo * II)4768 LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC,
4769 SourceLocation IdentL, IdentifierInfo *II) {
4770 return new (C, DC) LabelDecl(DC, IdentL, II, nullptr, IdentL);
4771 }
4772
Create(ASTContext & C,DeclContext * DC,SourceLocation IdentL,IdentifierInfo * II,SourceLocation GnuLabelL)4773 LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC,
4774 SourceLocation IdentL, IdentifierInfo *II,
4775 SourceLocation GnuLabelL) {
4776 assert(GnuLabelL != IdentL && "Use this only for GNU local labels");
4777 return new (C, DC) LabelDecl(DC, IdentL, II, nullptr, GnuLabelL);
4778 }
4779
CreateDeserialized(ASTContext & C,unsigned ID)4780 LabelDecl *LabelDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4781 return new (C, ID) LabelDecl(nullptr, SourceLocation(), nullptr, nullptr,
4782 SourceLocation());
4783 }
4784
setMSAsmLabel(StringRef Name)4785 void LabelDecl::setMSAsmLabel(StringRef Name) {
4786 char *Buffer = new (getASTContext(), 1) char[Name.size() + 1];
4787 memcpy(Buffer, Name.data(), Name.size());
4788 Buffer[Name.size()] = '\0';
4789 MSAsmName = Buffer;
4790 }
4791
anchor()4792 void ValueDecl::anchor() {}
4793
isWeak() const4794 bool ValueDecl::isWeak() const {
4795 auto *MostRecent = getMostRecentDecl();
4796 return MostRecent->hasAttr<WeakAttr>() ||
4797 MostRecent->hasAttr<WeakRefAttr>() || isWeakImported();
4798 }
4799
anchor()4800 void ImplicitParamDecl::anchor() {}
4801
Create(ASTContext & C,DeclContext * DC,SourceLocation IdLoc,IdentifierInfo * Id,QualType Type,ImplicitParamKind ParamKind)4802 ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, DeclContext *DC,
4803 SourceLocation IdLoc,
4804 IdentifierInfo *Id, QualType Type,
4805 ImplicitParamKind ParamKind) {
4806 return new (C, DC) ImplicitParamDecl(C, DC, IdLoc, Id, Type, ParamKind);
4807 }
4808
Create(ASTContext & C,QualType Type,ImplicitParamKind ParamKind)4809 ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, QualType Type,
4810 ImplicitParamKind ParamKind) {
4811 return new (C, nullptr) ImplicitParamDecl(C, Type, ParamKind);
4812 }
4813
CreateDeserialized(ASTContext & C,unsigned ID)4814 ImplicitParamDecl *ImplicitParamDecl::CreateDeserialized(ASTContext &C,
4815 unsigned ID) {
4816 return new (C, ID) ImplicitParamDecl(C, QualType(), ImplicitParamKind::Other);
4817 }
4818
Create(ASTContext & C,DeclContext * DC,SourceLocation StartLoc,const DeclarationNameInfo & NameInfo,QualType T,TypeSourceInfo * TInfo,StorageClass SC,bool isInlineSpecified,bool hasWrittenPrototype,ConstexprSpecKind ConstexprKind,Expr * TrailingRequiresClause)4819 FunctionDecl *FunctionDecl::Create(ASTContext &C, DeclContext *DC,
4820 SourceLocation StartLoc,
4821 const DeclarationNameInfo &NameInfo,
4822 QualType T, TypeSourceInfo *TInfo,
4823 StorageClass SC, bool isInlineSpecified,
4824 bool hasWrittenPrototype,
4825 ConstexprSpecKind ConstexprKind,
4826 Expr *TrailingRequiresClause) {
4827 FunctionDecl *New =
4828 new (C, DC) FunctionDecl(Function, C, DC, StartLoc, NameInfo, T, TInfo,
4829 SC, isInlineSpecified, ConstexprKind,
4830 TrailingRequiresClause);
4831 New->setHasWrittenPrototype(hasWrittenPrototype);
4832 return New;
4833 }
4834
CreateDeserialized(ASTContext & C,unsigned ID)4835 FunctionDecl *FunctionDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4836 return new (C, ID) FunctionDecl(
4837 Function, C, nullptr, SourceLocation(), DeclarationNameInfo(), QualType(),
4838 nullptr, SC_None, false, ConstexprSpecKind::Unspecified, nullptr);
4839 }
4840
Create(ASTContext & C,DeclContext * DC,SourceLocation L)4841 BlockDecl *BlockDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) {
4842 return new (C, DC) BlockDecl(DC, L);
4843 }
4844
CreateDeserialized(ASTContext & C,unsigned ID)4845 BlockDecl *BlockDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4846 return new (C, ID) BlockDecl(nullptr, SourceLocation());
4847 }
4848
CapturedDecl(DeclContext * DC,unsigned NumParams)4849 CapturedDecl::CapturedDecl(DeclContext *DC, unsigned NumParams)
4850 : Decl(Captured, DC, SourceLocation()), DeclContext(Captured),
4851 NumParams(NumParams), ContextParam(0), BodyAndNothrow(nullptr, false) {}
4852
Create(ASTContext & C,DeclContext * DC,unsigned NumParams)4853 CapturedDecl *CapturedDecl::Create(ASTContext &C, DeclContext *DC,
4854 unsigned NumParams) {
4855 return new (C, DC, additionalSizeToAlloc<ImplicitParamDecl *>(NumParams))
4856 CapturedDecl(DC, NumParams);
4857 }
4858
CreateDeserialized(ASTContext & C,unsigned ID,unsigned NumParams)4859 CapturedDecl *CapturedDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4860 unsigned NumParams) {
4861 return new (C, ID, additionalSizeToAlloc<ImplicitParamDecl *>(NumParams))
4862 CapturedDecl(nullptr, NumParams);
4863 }
4864
getBody() const4865 Stmt *CapturedDecl::getBody() const { return BodyAndNothrow.getPointer(); }
setBody(Stmt * B)4866 void CapturedDecl::setBody(Stmt *B) { BodyAndNothrow.setPointer(B); }
4867
isNothrow() const4868 bool CapturedDecl::isNothrow() const { return BodyAndNothrow.getInt(); }
setNothrow(bool Nothrow)4869 void CapturedDecl::setNothrow(bool Nothrow) { BodyAndNothrow.setInt(Nothrow); }
4870
Create(ASTContext & C,EnumDecl * CD,SourceLocation L,IdentifierInfo * Id,QualType T,Expr * E,const llvm::APSInt & V)4871 EnumConstantDecl *EnumConstantDecl::Create(ASTContext &C, EnumDecl *CD,
4872 SourceLocation L,
4873 IdentifierInfo *Id, QualType T,
4874 Expr *E, const llvm::APSInt &V) {
4875 return new (C, CD) EnumConstantDecl(CD, L, Id, T, E, V);
4876 }
4877
4878 EnumConstantDecl *
CreateDeserialized(ASTContext & C,unsigned ID)4879 EnumConstantDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4880 return new (C, ID) EnumConstantDecl(nullptr, SourceLocation(), nullptr,
4881 QualType(), nullptr, llvm::APSInt());
4882 }
4883
anchor()4884 void IndirectFieldDecl::anchor() {}
4885
IndirectFieldDecl(ASTContext & C,DeclContext * DC,SourceLocation L,DeclarationName N,QualType T,MutableArrayRef<NamedDecl * > CH)4886 IndirectFieldDecl::IndirectFieldDecl(ASTContext &C, DeclContext *DC,
4887 SourceLocation L, DeclarationName N,
4888 QualType T,
4889 MutableArrayRef<NamedDecl *> CH)
4890 : ValueDecl(IndirectField, DC, L, N, T), Chaining(CH.data()),
4891 ChainingSize(CH.size()) {
4892 // In C++, indirect field declarations conflict with tag declarations in the
4893 // same scope, so add them to IDNS_Tag so that tag redeclaration finds them.
4894 if (C.getLangOpts().CPlusPlus)
4895 IdentifierNamespace |= IDNS_Tag;
4896 }
4897
4898 IndirectFieldDecl *
Create(ASTContext & C,DeclContext * DC,SourceLocation L,IdentifierInfo * Id,QualType T,llvm::MutableArrayRef<NamedDecl * > CH)4899 IndirectFieldDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L,
4900 IdentifierInfo *Id, QualType T,
4901 llvm::MutableArrayRef<NamedDecl *> CH) {
4902 return new (C, DC) IndirectFieldDecl(C, DC, L, Id, T, CH);
4903 }
4904
CreateDeserialized(ASTContext & C,unsigned ID)4905 IndirectFieldDecl *IndirectFieldDecl::CreateDeserialized(ASTContext &C,
4906 unsigned ID) {
4907 return new (C, ID) IndirectFieldDecl(C, nullptr, SourceLocation(),
4908 DeclarationName(), QualType(), None);
4909 }
4910
getSourceRange() const4911 SourceRange EnumConstantDecl::getSourceRange() const {
4912 SourceLocation End = getLocation();
4913 if (Init)
4914 End = Init->getEndLoc();
4915 return SourceRange(getLocation(), End);
4916 }
4917
anchor()4918 void TypeDecl::anchor() {}
4919
Create(ASTContext & C,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,IdentifierInfo * Id,TypeSourceInfo * TInfo)4920 TypedefDecl *TypedefDecl::Create(ASTContext &C, DeclContext *DC,
4921 SourceLocation StartLoc, SourceLocation IdLoc,
4922 IdentifierInfo *Id, TypeSourceInfo *TInfo) {
4923 return new (C, DC) TypedefDecl(C, DC, StartLoc, IdLoc, Id, TInfo);
4924 }
4925
anchor()4926 void TypedefNameDecl::anchor() {}
4927
getAnonDeclWithTypedefName(bool AnyRedecl) const4928 TagDecl *TypedefNameDecl::getAnonDeclWithTypedefName(bool AnyRedecl) const {
4929 if (auto *TT = getTypeSourceInfo()->getType()->getAs<TagType>()) {
4930 auto *OwningTypedef = TT->getDecl()->getTypedefNameForAnonDecl();
4931 auto *ThisTypedef = this;
4932 if (AnyRedecl && OwningTypedef) {
4933 OwningTypedef = OwningTypedef->getCanonicalDecl();
4934 ThisTypedef = ThisTypedef->getCanonicalDecl();
4935 }
4936 if (OwningTypedef == ThisTypedef)
4937 return TT->getDecl();
4938 }
4939
4940 return nullptr;
4941 }
4942
isTransparentTagSlow() const4943 bool TypedefNameDecl::isTransparentTagSlow() const {
4944 auto determineIsTransparent = [&]() {
4945 if (auto *TT = getUnderlyingType()->getAs<TagType>()) {
4946 if (auto *TD = TT->getDecl()) {
4947 if (TD->getName() != getName())
4948 return false;
4949 SourceLocation TTLoc = getLocation();
4950 SourceLocation TDLoc = TD->getLocation();
4951 if (!TTLoc.isMacroID() || !TDLoc.isMacroID())
4952 return false;
4953 SourceManager &SM = getASTContext().getSourceManager();
4954 return SM.getSpellingLoc(TTLoc) == SM.getSpellingLoc(TDLoc);
4955 }
4956 }
4957 return false;
4958 };
4959
4960 bool isTransparent = determineIsTransparent();
4961 MaybeModedTInfo.setInt((isTransparent << 1) | 1);
4962 return isTransparent;
4963 }
4964
CreateDeserialized(ASTContext & C,unsigned ID)4965 TypedefDecl *TypedefDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4966 return new (C, ID) TypedefDecl(C, nullptr, SourceLocation(), SourceLocation(),
4967 nullptr, nullptr);
4968 }
4969
Create(ASTContext & C,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,IdentifierInfo * Id,TypeSourceInfo * TInfo)4970 TypeAliasDecl *TypeAliasDecl::Create(ASTContext &C, DeclContext *DC,
4971 SourceLocation StartLoc,
4972 SourceLocation IdLoc, IdentifierInfo *Id,
4973 TypeSourceInfo *TInfo) {
4974 return new (C, DC) TypeAliasDecl(C, DC, StartLoc, IdLoc, Id, TInfo);
4975 }
4976
CreateDeserialized(ASTContext & C,unsigned ID)4977 TypeAliasDecl *TypeAliasDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4978 return new (C, ID) TypeAliasDecl(C, nullptr, SourceLocation(),
4979 SourceLocation(), nullptr, nullptr);
4980 }
4981
getSourceRange() const4982 SourceRange TypedefDecl::getSourceRange() const {
4983 SourceLocation RangeEnd = getLocation();
4984 if (TypeSourceInfo *TInfo = getTypeSourceInfo()) {
4985 if (typeIsPostfix(TInfo->getType()))
4986 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
4987 }
4988 return SourceRange(getBeginLoc(), RangeEnd);
4989 }
4990
getSourceRange() const4991 SourceRange TypeAliasDecl::getSourceRange() const {
4992 SourceLocation RangeEnd = getBeginLoc();
4993 if (TypeSourceInfo *TInfo = getTypeSourceInfo())
4994 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
4995 return SourceRange(getBeginLoc(), RangeEnd);
4996 }
4997
anchor()4998 void FileScopeAsmDecl::anchor() {}
4999
Create(ASTContext & C,DeclContext * DC,StringLiteral * Str,SourceLocation AsmLoc,SourceLocation RParenLoc)5000 FileScopeAsmDecl *FileScopeAsmDecl::Create(ASTContext &C, DeclContext *DC,
5001 StringLiteral *Str,
5002 SourceLocation AsmLoc,
5003 SourceLocation RParenLoc) {
5004 return new (C, DC) FileScopeAsmDecl(DC, Str, AsmLoc, RParenLoc);
5005 }
5006
CreateDeserialized(ASTContext & C,unsigned ID)5007 FileScopeAsmDecl *FileScopeAsmDecl::CreateDeserialized(ASTContext &C,
5008 unsigned ID) {
5009 return new (C, ID) FileScopeAsmDecl(nullptr, nullptr, SourceLocation(),
5010 SourceLocation());
5011 }
5012
anchor()5013 void EmptyDecl::anchor() {}
5014
Create(ASTContext & C,DeclContext * DC,SourceLocation L)5015 EmptyDecl *EmptyDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) {
5016 return new (C, DC) EmptyDecl(DC, L);
5017 }
5018
CreateDeserialized(ASTContext & C,unsigned ID)5019 EmptyDecl *EmptyDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
5020 return new (C, ID) EmptyDecl(nullptr, SourceLocation());
5021 }
5022
5023 //===----------------------------------------------------------------------===//
5024 // ImportDecl Implementation
5025 //===----------------------------------------------------------------------===//
5026
5027 /// Retrieve the number of module identifiers needed to name the given
5028 /// module.
getNumModuleIdentifiers(Module * Mod)5029 static unsigned getNumModuleIdentifiers(Module *Mod) {
5030 unsigned Result = 1;
5031 while (Mod->Parent) {
5032 Mod = Mod->Parent;
5033 ++Result;
5034 }
5035 return Result;
5036 }
5037
ImportDecl(DeclContext * DC,SourceLocation StartLoc,Module * Imported,ArrayRef<SourceLocation> IdentifierLocs)5038 ImportDecl::ImportDecl(DeclContext *DC, SourceLocation StartLoc,
5039 Module *Imported,
5040 ArrayRef<SourceLocation> IdentifierLocs)
5041 : Decl(Import, DC, StartLoc), ImportedModule(Imported),
5042 NextLocalImportAndComplete(nullptr, true) {
5043 assert(getNumModuleIdentifiers(Imported) == IdentifierLocs.size());
5044 auto *StoredLocs = getTrailingObjects<SourceLocation>();
5045 std::uninitialized_copy(IdentifierLocs.begin(), IdentifierLocs.end(),
5046 StoredLocs);
5047 }
5048
ImportDecl(DeclContext * DC,SourceLocation StartLoc,Module * Imported,SourceLocation EndLoc)5049 ImportDecl::ImportDecl(DeclContext *DC, SourceLocation StartLoc,
5050 Module *Imported, SourceLocation EndLoc)
5051 : Decl(Import, DC, StartLoc), ImportedModule(Imported),
5052 NextLocalImportAndComplete(nullptr, false) {
5053 *getTrailingObjects<SourceLocation>() = EndLoc;
5054 }
5055
Create(ASTContext & C,DeclContext * DC,SourceLocation StartLoc,Module * Imported,ArrayRef<SourceLocation> IdentifierLocs)5056 ImportDecl *ImportDecl::Create(ASTContext &C, DeclContext *DC,
5057 SourceLocation StartLoc, Module *Imported,
5058 ArrayRef<SourceLocation> IdentifierLocs) {
5059 return new (C, DC,
5060 additionalSizeToAlloc<SourceLocation>(IdentifierLocs.size()))
5061 ImportDecl(DC, StartLoc, Imported, IdentifierLocs);
5062 }
5063
CreateImplicit(ASTContext & C,DeclContext * DC,SourceLocation StartLoc,Module * Imported,SourceLocation EndLoc)5064 ImportDecl *ImportDecl::CreateImplicit(ASTContext &C, DeclContext *DC,
5065 SourceLocation StartLoc,
5066 Module *Imported,
5067 SourceLocation EndLoc) {
5068 ImportDecl *Import = new (C, DC, additionalSizeToAlloc<SourceLocation>(1))
5069 ImportDecl(DC, StartLoc, Imported, EndLoc);
5070 Import->setImplicit();
5071 return Import;
5072 }
5073
CreateDeserialized(ASTContext & C,unsigned ID,unsigned NumLocations)5074 ImportDecl *ImportDecl::CreateDeserialized(ASTContext &C, unsigned ID,
5075 unsigned NumLocations) {
5076 return new (C, ID, additionalSizeToAlloc<SourceLocation>(NumLocations))
5077 ImportDecl(EmptyShell());
5078 }
5079
getIdentifierLocs() const5080 ArrayRef<SourceLocation> ImportDecl::getIdentifierLocs() const {
5081 if (!isImportComplete())
5082 return None;
5083
5084 const auto *StoredLocs = getTrailingObjects<SourceLocation>();
5085 return llvm::makeArrayRef(StoredLocs,
5086 getNumModuleIdentifiers(getImportedModule()));
5087 }
5088
getSourceRange() const5089 SourceRange ImportDecl::getSourceRange() const {
5090 if (!isImportComplete())
5091 return SourceRange(getLocation(), *getTrailingObjects<SourceLocation>());
5092
5093 return SourceRange(getLocation(), getIdentifierLocs().back());
5094 }
5095
5096 //===----------------------------------------------------------------------===//
5097 // ExportDecl Implementation
5098 //===----------------------------------------------------------------------===//
5099
anchor()5100 void ExportDecl::anchor() {}
5101
Create(ASTContext & C,DeclContext * DC,SourceLocation ExportLoc)5102 ExportDecl *ExportDecl::Create(ASTContext &C, DeclContext *DC,
5103 SourceLocation ExportLoc) {
5104 return new (C, DC) ExportDecl(DC, ExportLoc);
5105 }
5106
CreateDeserialized(ASTContext & C,unsigned ID)5107 ExportDecl *ExportDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
5108 return new (C, ID) ExportDecl(nullptr, SourceLocation());
5109 }
5110