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 assert(cast<VarDecl>(D)->isStaticLocal());
1304 // If this was an implicitly hidden inline method, check again for
1305 // explicit visibility on the parent class, and use that for static locals
1306 // if present.
1307 if (const auto *MD = dyn_cast<CXXMethodDecl>(FD))
1308 LV = getLVForDecl(MD->getParent(), computation);
1309 if (!LV.isVisibilityExplicit()) {
1310 Visibility globalVisibility =
1311 computation.isValueVisibility()
1312 ? Context.getLangOpts().getValueVisibilityMode()
1313 : Context.getLangOpts().getTypeVisibilityMode();
1314 return LinkageInfo(VisibleNoLinkage, globalVisibility,
1315 /*visibilityExplicit=*/false);
1316 }
1317 }
1318 }
1319 if (!isExternallyVisible(LV.getLinkage()))
1320 return LinkageInfo::none();
1321 return LinkageInfo(VisibleNoLinkage, LV.getVisibility(),
1322 LV.isVisibilityExplicit());
1323 }
1324
computeLVForDecl(const NamedDecl * D,LVComputationKind computation,bool IgnoreVarTypeLinkage)1325 LinkageInfo LinkageComputer::computeLVForDecl(const NamedDecl *D,
1326 LVComputationKind computation,
1327 bool IgnoreVarTypeLinkage) {
1328 // Internal_linkage attribute overrides other considerations.
1329 if (D->hasAttr<InternalLinkageAttr>())
1330 return getInternalLinkageFor(D);
1331
1332 // Objective-C: treat all Objective-C declarations as having external
1333 // linkage.
1334 switch (D->getKind()) {
1335 default:
1336 break;
1337
1338 // Per C++ [basic.link]p2, only the names of objects, references,
1339 // functions, types, templates, namespaces, and values ever have linkage.
1340 //
1341 // Note that the name of a typedef, namespace alias, using declaration,
1342 // and so on are not the name of the corresponding type, namespace, or
1343 // declaration, so they do *not* have linkage.
1344 case Decl::ImplicitParam:
1345 case Decl::Label:
1346 case Decl::NamespaceAlias:
1347 case Decl::ParmVar:
1348 case Decl::Using:
1349 case Decl::UsingShadow:
1350 case Decl::UsingDirective:
1351 return LinkageInfo::none();
1352
1353 case Decl::EnumConstant:
1354 // C++ [basic.link]p4: an enumerator has the linkage of its enumeration.
1355 if (D->getASTContext().getLangOpts().CPlusPlus)
1356 return getLVForDecl(cast<EnumDecl>(D->getDeclContext()), computation);
1357 return LinkageInfo::visible_none();
1358
1359 case Decl::Typedef:
1360 case Decl::TypeAlias:
1361 // A typedef declaration has linkage if it gives a type a name for
1362 // linkage purposes.
1363 if (!cast<TypedefNameDecl>(D)
1364 ->getAnonDeclWithTypedefName(/*AnyRedecl*/true))
1365 return LinkageInfo::none();
1366 break;
1367
1368 case Decl::TemplateTemplateParm: // count these as external
1369 case Decl::NonTypeTemplateParm:
1370 case Decl::ObjCAtDefsField:
1371 case Decl::ObjCCategory:
1372 case Decl::ObjCCategoryImpl:
1373 case Decl::ObjCCompatibleAlias:
1374 case Decl::ObjCImplementation:
1375 case Decl::ObjCMethod:
1376 case Decl::ObjCProperty:
1377 case Decl::ObjCPropertyImpl:
1378 case Decl::ObjCProtocol:
1379 return getExternalLinkageFor(D);
1380
1381 case Decl::CXXRecord: {
1382 const auto *Record = cast<CXXRecordDecl>(D);
1383 if (Record->isLambda()) {
1384 if (Record->hasKnownLambdaInternalLinkage() ||
1385 !Record->getLambdaManglingNumber()) {
1386 // This lambda has no mangling number, so it's internal.
1387 return getInternalLinkageFor(D);
1388 }
1389
1390 return getLVForClosure(
1391 Record->getDeclContext()->getRedeclContext(),
1392 Record->getLambdaContextDecl(), computation);
1393 }
1394
1395 break;
1396 }
1397 }
1398
1399 // Handle linkage for namespace-scope names.
1400 if (D->getDeclContext()->getRedeclContext()->isFileContext())
1401 return getLVForNamespaceScopeDecl(D, computation, IgnoreVarTypeLinkage);
1402
1403 // C++ [basic.link]p5:
1404 // In addition, a member function, static data member, a named
1405 // class or enumeration of class scope, or an unnamed class or
1406 // enumeration defined in a class-scope typedef declaration such
1407 // that the class or enumeration has the typedef name for linkage
1408 // purposes (7.1.3), has external linkage if the name of the class
1409 // has external linkage.
1410 if (D->getDeclContext()->isRecord())
1411 return getLVForClassMember(D, computation, IgnoreVarTypeLinkage);
1412
1413 // C++ [basic.link]p6:
1414 // The name of a function declared in block scope and the name of
1415 // an object declared by a block scope extern declaration have
1416 // linkage. If there is a visible declaration of an entity with
1417 // linkage having the same name and type, ignoring entities
1418 // declared outside the innermost enclosing namespace scope, the
1419 // block scope declaration declares that same entity and receives
1420 // the linkage of the previous declaration. If there is more than
1421 // one such matching entity, the program is ill-formed. Otherwise,
1422 // if no matching entity is found, the block scope entity receives
1423 // external linkage.
1424 if (D->getDeclContext()->isFunctionOrMethod())
1425 return getLVForLocalDecl(D, computation);
1426
1427 // C++ [basic.link]p6:
1428 // Names not covered by these rules have no linkage.
1429 return LinkageInfo::none();
1430 }
1431
1432 /// getLVForDecl - Get the linkage and visibility for the given declaration.
getLVForDecl(const NamedDecl * D,LVComputationKind computation)1433 LinkageInfo LinkageComputer::getLVForDecl(const NamedDecl *D,
1434 LVComputationKind computation) {
1435 // Internal_linkage attribute overrides other considerations.
1436 if (D->hasAttr<InternalLinkageAttr>())
1437 return getInternalLinkageFor(D);
1438
1439 if (computation.IgnoreAllVisibility && D->hasCachedLinkage())
1440 return LinkageInfo(D->getCachedLinkage(), DefaultVisibility, false);
1441
1442 if (llvm::Optional<LinkageInfo> LI = lookup(D, computation))
1443 return *LI;
1444
1445 LinkageInfo LV = computeLVForDecl(D, computation);
1446 if (D->hasCachedLinkage())
1447 assert(D->getCachedLinkage() == LV.getLinkage());
1448
1449 D->setCachedLinkage(LV.getLinkage());
1450 cache(D, computation, LV);
1451
1452 #ifndef NDEBUG
1453 // In C (because of gnu inline) and in c++ with microsoft extensions an
1454 // static can follow an extern, so we can have two decls with different
1455 // linkages.
1456 const LangOptions &Opts = D->getASTContext().getLangOpts();
1457 if (!Opts.CPlusPlus || Opts.MicrosoftExt)
1458 return LV;
1459
1460 // We have just computed the linkage for this decl. By induction we know
1461 // that all other computed linkages match, check that the one we just
1462 // computed also does.
1463 NamedDecl *Old = nullptr;
1464 for (auto I : D->redecls()) {
1465 auto *T = cast<NamedDecl>(I);
1466 if (T == D)
1467 continue;
1468 if (!T->isInvalidDecl() && T->hasCachedLinkage()) {
1469 Old = T;
1470 break;
1471 }
1472 }
1473 assert(!Old || Old->getCachedLinkage() == D->getCachedLinkage());
1474 #endif
1475
1476 return LV;
1477 }
1478
getDeclLinkageAndVisibility(const NamedDecl * D)1479 LinkageInfo LinkageComputer::getDeclLinkageAndVisibility(const NamedDecl *D) {
1480 return getLVForDecl(D,
1481 LVComputationKind(usesTypeVisibility(D)
1482 ? NamedDecl::VisibilityForType
1483 : NamedDecl::VisibilityForValue));
1484 }
1485
getOwningModuleForLinkage(bool IgnoreLinkage) const1486 Module *Decl::getOwningModuleForLinkage(bool IgnoreLinkage) const {
1487 Module *M = getOwningModule();
1488 if (!M)
1489 return nullptr;
1490
1491 switch (M->Kind) {
1492 case Module::ModuleMapModule:
1493 // Module map modules have no special linkage semantics.
1494 return nullptr;
1495
1496 case Module::ModuleInterfaceUnit:
1497 return M;
1498
1499 case Module::GlobalModuleFragment: {
1500 // External linkage declarations in the global module have no owning module
1501 // for linkage purposes. But internal linkage declarations in the global
1502 // module fragment of a particular module are owned by that module for
1503 // linkage purposes.
1504 if (IgnoreLinkage)
1505 return nullptr;
1506 bool InternalLinkage;
1507 if (auto *ND = dyn_cast<NamedDecl>(this))
1508 InternalLinkage = !ND->hasExternalFormalLinkage();
1509 else {
1510 auto *NSD = dyn_cast<NamespaceDecl>(this);
1511 InternalLinkage = (NSD && NSD->isAnonymousNamespace()) ||
1512 isInAnonymousNamespace();
1513 }
1514 return InternalLinkage ? M->Parent : nullptr;
1515 }
1516
1517 case Module::PrivateModuleFragment:
1518 // The private module fragment is part of its containing module for linkage
1519 // purposes.
1520 return M->Parent;
1521 }
1522
1523 llvm_unreachable("unknown module kind");
1524 }
1525
printName(raw_ostream & os) const1526 void NamedDecl::printName(raw_ostream &os) const {
1527 os << Name;
1528 }
1529
getQualifiedNameAsString() const1530 std::string NamedDecl::getQualifiedNameAsString() const {
1531 std::string QualName;
1532 llvm::raw_string_ostream OS(QualName);
1533 printQualifiedName(OS, getASTContext().getPrintingPolicy());
1534 return OS.str();
1535 }
1536
printQualifiedName(raw_ostream & OS) const1537 void NamedDecl::printQualifiedName(raw_ostream &OS) const {
1538 printQualifiedName(OS, getASTContext().getPrintingPolicy());
1539 }
1540
printQualifiedName(raw_ostream & OS,const PrintingPolicy & P) const1541 void NamedDecl::printQualifiedName(raw_ostream &OS,
1542 const PrintingPolicy &P) const {
1543 if (getDeclContext()->isFunctionOrMethod()) {
1544 // We do not print '(anonymous)' for function parameters without name.
1545 printName(OS);
1546 return;
1547 }
1548 printNestedNameSpecifier(OS, P);
1549 if (getDeclName())
1550 OS << *this;
1551 else {
1552 // Give the printName override a chance to pick a different name before we
1553 // fall back to "(anonymous)".
1554 SmallString<64> NameBuffer;
1555 llvm::raw_svector_ostream NameOS(NameBuffer);
1556 printName(NameOS);
1557 if (NameBuffer.empty())
1558 OS << "(anonymous)";
1559 else
1560 OS << NameBuffer;
1561 }
1562 }
1563
printNestedNameSpecifier(raw_ostream & OS) const1564 void NamedDecl::printNestedNameSpecifier(raw_ostream &OS) const {
1565 printNestedNameSpecifier(OS, getASTContext().getPrintingPolicy());
1566 }
1567
printNestedNameSpecifier(raw_ostream & OS,const PrintingPolicy & P) const1568 void NamedDecl::printNestedNameSpecifier(raw_ostream &OS,
1569 const PrintingPolicy &P) const {
1570 const DeclContext *Ctx = getDeclContext();
1571
1572 // For ObjC methods and properties, look through categories and use the
1573 // interface as context.
1574 if (auto *MD = dyn_cast<ObjCMethodDecl>(this)) {
1575 if (auto *ID = MD->getClassInterface())
1576 Ctx = ID;
1577 } else if (auto *PD = dyn_cast<ObjCPropertyDecl>(this)) {
1578 if (auto *MD = PD->getGetterMethodDecl())
1579 if (auto *ID = MD->getClassInterface())
1580 Ctx = ID;
1581 } else if (auto *ID = dyn_cast<ObjCIvarDecl>(this)) {
1582 if (auto *CI = ID->getContainingInterface())
1583 Ctx = CI;
1584 }
1585
1586 if (Ctx->isFunctionOrMethod())
1587 return;
1588
1589 using ContextsTy = SmallVector<const DeclContext *, 8>;
1590 ContextsTy Contexts;
1591
1592 // Collect named contexts.
1593 while (Ctx) {
1594 if (isa<NamedDecl>(Ctx))
1595 Contexts.push_back(Ctx);
1596 Ctx = Ctx->getParent();
1597 }
1598
1599 for (const DeclContext *DC : llvm::reverse(Contexts)) {
1600 if (const auto *Spec = dyn_cast<ClassTemplateSpecializationDecl>(DC)) {
1601 OS << Spec->getName();
1602 const TemplateArgumentList &TemplateArgs = Spec->getTemplateArgs();
1603 printTemplateArgumentList(OS, TemplateArgs.asArray(), P);
1604 } else if (const auto *ND = dyn_cast<NamespaceDecl>(DC)) {
1605 if (P.SuppressUnwrittenScope &&
1606 (ND->isAnonymousNamespace() || ND->isInline()))
1607 continue;
1608 if (ND->isAnonymousNamespace()) {
1609 OS << (P.MSVCFormatting ? "`anonymous namespace\'"
1610 : "(anonymous namespace)");
1611 }
1612 else
1613 OS << *ND;
1614 } else if (const auto *RD = dyn_cast<RecordDecl>(DC)) {
1615 if (!RD->getIdentifier())
1616 OS << "(anonymous " << RD->getKindName() << ')';
1617 else
1618 OS << *RD;
1619 } else if (const auto *FD = dyn_cast<FunctionDecl>(DC)) {
1620 const FunctionProtoType *FT = nullptr;
1621 if (FD->hasWrittenPrototype())
1622 FT = dyn_cast<FunctionProtoType>(FD->getType()->castAs<FunctionType>());
1623
1624 OS << *FD << '(';
1625 if (FT) {
1626 unsigned NumParams = FD->getNumParams();
1627 for (unsigned i = 0; i < NumParams; ++i) {
1628 if (i)
1629 OS << ", ";
1630 OS << FD->getParamDecl(i)->getType().stream(P);
1631 }
1632
1633 if (FT->isVariadic()) {
1634 if (NumParams > 0)
1635 OS << ", ";
1636 OS << "...";
1637 }
1638 }
1639 OS << ')';
1640 } else if (const auto *ED = dyn_cast<EnumDecl>(DC)) {
1641 // C++ [dcl.enum]p10: Each enum-name and each unscoped
1642 // enumerator is declared in the scope that immediately contains
1643 // the enum-specifier. Each scoped enumerator is declared in the
1644 // scope of the enumeration.
1645 // For the case of unscoped enumerator, do not include in the qualified
1646 // name any information about its enum enclosing scope, as its visibility
1647 // is global.
1648 if (ED->isScoped())
1649 OS << *ED;
1650 else
1651 continue;
1652 } else {
1653 OS << *cast<NamedDecl>(DC);
1654 }
1655 OS << "::";
1656 }
1657 }
1658
getNameForDiagnostic(raw_ostream & OS,const PrintingPolicy & Policy,bool Qualified) const1659 void NamedDecl::getNameForDiagnostic(raw_ostream &OS,
1660 const PrintingPolicy &Policy,
1661 bool Qualified) const {
1662 if (Qualified)
1663 printQualifiedName(OS, Policy);
1664 else
1665 printName(OS);
1666 }
1667
isRedeclarableImpl(Redeclarable<T> *)1668 template<typename T> static bool isRedeclarableImpl(Redeclarable<T> *) {
1669 return true;
1670 }
isRedeclarableImpl(...)1671 static bool isRedeclarableImpl(...) { return false; }
isRedeclarable(Decl::Kind K)1672 static bool isRedeclarable(Decl::Kind K) {
1673 switch (K) {
1674 #define DECL(Type, Base) \
1675 case Decl::Type: \
1676 return isRedeclarableImpl((Type##Decl *)nullptr);
1677 #define ABSTRACT_DECL(DECL)
1678 #include "clang/AST/DeclNodes.inc"
1679 }
1680 llvm_unreachable("unknown decl kind");
1681 }
1682
declarationReplaces(NamedDecl * OldD,bool IsKnownNewer) const1683 bool NamedDecl::declarationReplaces(NamedDecl *OldD, bool IsKnownNewer) const {
1684 assert(getDeclName() == OldD->getDeclName() && "Declaration name mismatch");
1685
1686 // Never replace one imported declaration with another; we need both results
1687 // when re-exporting.
1688 if (OldD->isFromASTFile() && isFromASTFile())
1689 return false;
1690
1691 // A kind mismatch implies that the declaration is not replaced.
1692 if (OldD->getKind() != getKind())
1693 return false;
1694
1695 // For method declarations, we never replace. (Why?)
1696 if (isa<ObjCMethodDecl>(this))
1697 return false;
1698
1699 // For parameters, pick the newer one. This is either an error or (in
1700 // Objective-C) permitted as an extension.
1701 if (isa<ParmVarDecl>(this))
1702 return true;
1703
1704 // Inline namespaces can give us two declarations with the same
1705 // name and kind in the same scope but different contexts; we should
1706 // keep both declarations in this case.
1707 if (!this->getDeclContext()->getRedeclContext()->Equals(
1708 OldD->getDeclContext()->getRedeclContext()))
1709 return false;
1710
1711 // Using declarations can be replaced if they import the same name from the
1712 // same context.
1713 if (auto *UD = dyn_cast<UsingDecl>(this)) {
1714 ASTContext &Context = getASTContext();
1715 return Context.getCanonicalNestedNameSpecifier(UD->getQualifier()) ==
1716 Context.getCanonicalNestedNameSpecifier(
1717 cast<UsingDecl>(OldD)->getQualifier());
1718 }
1719 if (auto *UUVD = dyn_cast<UnresolvedUsingValueDecl>(this)) {
1720 ASTContext &Context = getASTContext();
1721 return Context.getCanonicalNestedNameSpecifier(UUVD->getQualifier()) ==
1722 Context.getCanonicalNestedNameSpecifier(
1723 cast<UnresolvedUsingValueDecl>(OldD)->getQualifier());
1724 }
1725
1726 if (isRedeclarable(getKind())) {
1727 if (getCanonicalDecl() != OldD->getCanonicalDecl())
1728 return false;
1729
1730 if (IsKnownNewer)
1731 return true;
1732
1733 // Check whether this is actually newer than OldD. We want to keep the
1734 // newer declaration. This loop will usually only iterate once, because
1735 // OldD is usually the previous declaration.
1736 for (auto D : redecls()) {
1737 if (D == OldD)
1738 break;
1739
1740 // If we reach the canonical declaration, then OldD is not actually older
1741 // than this one.
1742 //
1743 // FIXME: In this case, we should not add this decl to the lookup table.
1744 if (D->isCanonicalDecl())
1745 return false;
1746 }
1747
1748 // It's a newer declaration of the same kind of declaration in the same
1749 // scope: we want this decl instead of the existing one.
1750 return true;
1751 }
1752
1753 // In all other cases, we need to keep both declarations in case they have
1754 // different visibility. Any attempt to use the name will result in an
1755 // ambiguity if more than one is visible.
1756 return false;
1757 }
1758
hasLinkage() const1759 bool NamedDecl::hasLinkage() const {
1760 return getFormalLinkage() != NoLinkage;
1761 }
1762
getUnderlyingDeclImpl()1763 NamedDecl *NamedDecl::getUnderlyingDeclImpl() {
1764 NamedDecl *ND = this;
1765 while (auto *UD = dyn_cast<UsingShadowDecl>(ND))
1766 ND = UD->getTargetDecl();
1767
1768 if (auto *AD = dyn_cast<ObjCCompatibleAliasDecl>(ND))
1769 return AD->getClassInterface();
1770
1771 if (auto *AD = dyn_cast<NamespaceAliasDecl>(ND))
1772 return AD->getNamespace();
1773
1774 return ND;
1775 }
1776
isCXXInstanceMember() const1777 bool NamedDecl::isCXXInstanceMember() const {
1778 if (!isCXXClassMember())
1779 return false;
1780
1781 const NamedDecl *D = this;
1782 if (isa<UsingShadowDecl>(D))
1783 D = cast<UsingShadowDecl>(D)->getTargetDecl();
1784
1785 if (isa<FieldDecl>(D) || isa<IndirectFieldDecl>(D) || isa<MSPropertyDecl>(D))
1786 return true;
1787 if (const auto *MD = dyn_cast_or_null<CXXMethodDecl>(D->getAsFunction()))
1788 return MD->isInstance();
1789 return false;
1790 }
1791
1792 //===----------------------------------------------------------------------===//
1793 // DeclaratorDecl Implementation
1794 //===----------------------------------------------------------------------===//
1795
1796 template <typename DeclT>
getTemplateOrInnerLocStart(const DeclT * decl)1797 static SourceLocation getTemplateOrInnerLocStart(const DeclT *decl) {
1798 if (decl->getNumTemplateParameterLists() > 0)
1799 return decl->getTemplateParameterList(0)->getTemplateLoc();
1800 else
1801 return decl->getInnerLocStart();
1802 }
1803
getTypeSpecStartLoc() const1804 SourceLocation DeclaratorDecl::getTypeSpecStartLoc() const {
1805 TypeSourceInfo *TSI = getTypeSourceInfo();
1806 if (TSI) return TSI->getTypeLoc().getBeginLoc();
1807 return SourceLocation();
1808 }
1809
getTypeSpecEndLoc() const1810 SourceLocation DeclaratorDecl::getTypeSpecEndLoc() const {
1811 TypeSourceInfo *TSI = getTypeSourceInfo();
1812 if (TSI) return TSI->getTypeLoc().getEndLoc();
1813 return SourceLocation();
1814 }
1815
setQualifierInfo(NestedNameSpecifierLoc QualifierLoc)1816 void DeclaratorDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) {
1817 if (QualifierLoc) {
1818 // Make sure the extended decl info is allocated.
1819 if (!hasExtInfo()) {
1820 // Save (non-extended) type source info pointer.
1821 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
1822 // Allocate external info struct.
1823 DeclInfo = new (getASTContext()) ExtInfo;
1824 // Restore savedTInfo into (extended) decl info.
1825 getExtInfo()->TInfo = savedTInfo;
1826 }
1827 // Set qualifier info.
1828 getExtInfo()->QualifierLoc = QualifierLoc;
1829 } else if (hasExtInfo()) {
1830 // Here Qualifier == 0, i.e., we are removing the qualifier (if any).
1831 getExtInfo()->QualifierLoc = QualifierLoc;
1832 }
1833 }
1834
setTrailingRequiresClause(Expr * TrailingRequiresClause)1835 void DeclaratorDecl::setTrailingRequiresClause(Expr *TrailingRequiresClause) {
1836 assert(TrailingRequiresClause);
1837 // Make sure the extended decl info is allocated.
1838 if (!hasExtInfo()) {
1839 // Save (non-extended) type source info pointer.
1840 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
1841 // Allocate external info struct.
1842 DeclInfo = new (getASTContext()) ExtInfo;
1843 // Restore savedTInfo into (extended) decl info.
1844 getExtInfo()->TInfo = savedTInfo;
1845 }
1846 // Set requires clause info.
1847 getExtInfo()->TrailingRequiresClause = TrailingRequiresClause;
1848 }
1849
setTemplateParameterListsInfo(ASTContext & Context,ArrayRef<TemplateParameterList * > TPLists)1850 void DeclaratorDecl::setTemplateParameterListsInfo(
1851 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
1852 assert(!TPLists.empty());
1853 // Make sure the extended decl info is allocated.
1854 if (!hasExtInfo()) {
1855 // Save (non-extended) type source info pointer.
1856 auto *savedTInfo = DeclInfo.get<TypeSourceInfo*>();
1857 // Allocate external info struct.
1858 DeclInfo = new (getASTContext()) ExtInfo;
1859 // Restore savedTInfo into (extended) decl info.
1860 getExtInfo()->TInfo = savedTInfo;
1861 }
1862 // Set the template parameter lists info.
1863 getExtInfo()->setTemplateParameterListsInfo(Context, TPLists);
1864 }
1865
getOuterLocStart() const1866 SourceLocation DeclaratorDecl::getOuterLocStart() const {
1867 return getTemplateOrInnerLocStart(this);
1868 }
1869
1870 // Helper function: returns true if QT is or contains a type
1871 // having a postfix component.
typeIsPostfix(QualType QT)1872 static bool typeIsPostfix(QualType QT) {
1873 while (true) {
1874 const Type* T = QT.getTypePtr();
1875 switch (T->getTypeClass()) {
1876 default:
1877 return false;
1878 case Type::Pointer:
1879 QT = cast<PointerType>(T)->getPointeeType();
1880 break;
1881 case Type::BlockPointer:
1882 QT = cast<BlockPointerType>(T)->getPointeeType();
1883 break;
1884 case Type::MemberPointer:
1885 QT = cast<MemberPointerType>(T)->getPointeeType();
1886 break;
1887 case Type::LValueReference:
1888 case Type::RValueReference:
1889 QT = cast<ReferenceType>(T)->getPointeeType();
1890 break;
1891 case Type::PackExpansion:
1892 QT = cast<PackExpansionType>(T)->getPattern();
1893 break;
1894 case Type::Paren:
1895 case Type::ConstantArray:
1896 case Type::DependentSizedArray:
1897 case Type::IncompleteArray:
1898 case Type::VariableArray:
1899 case Type::FunctionProto:
1900 case Type::FunctionNoProto:
1901 return true;
1902 }
1903 }
1904 }
1905
getSourceRange() const1906 SourceRange DeclaratorDecl::getSourceRange() const {
1907 SourceLocation RangeEnd = getLocation();
1908 if (TypeSourceInfo *TInfo = getTypeSourceInfo()) {
1909 // If the declaration has no name or the type extends past the name take the
1910 // end location of the type.
1911 if (!getDeclName() || typeIsPostfix(TInfo->getType()))
1912 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
1913 }
1914 return SourceRange(getOuterLocStart(), RangeEnd);
1915 }
1916
setTemplateParameterListsInfo(ASTContext & Context,ArrayRef<TemplateParameterList * > TPLists)1917 void QualifierInfo::setTemplateParameterListsInfo(
1918 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
1919 // Free previous template parameters (if any).
1920 if (NumTemplParamLists > 0) {
1921 Context.Deallocate(TemplParamLists);
1922 TemplParamLists = nullptr;
1923 NumTemplParamLists = 0;
1924 }
1925 // Set info on matched template parameter lists (if any).
1926 if (!TPLists.empty()) {
1927 TemplParamLists = new (Context) TemplateParameterList *[TPLists.size()];
1928 NumTemplParamLists = TPLists.size();
1929 std::copy(TPLists.begin(), TPLists.end(), TemplParamLists);
1930 }
1931 }
1932
1933 //===----------------------------------------------------------------------===//
1934 // VarDecl Implementation
1935 //===----------------------------------------------------------------------===//
1936
getStorageClassSpecifierString(StorageClass SC)1937 const char *VarDecl::getStorageClassSpecifierString(StorageClass SC) {
1938 switch (SC) {
1939 case SC_None: break;
1940 case SC_Auto: return "auto";
1941 case SC_Extern: return "extern";
1942 case SC_PrivateExtern: return "__private_extern__";
1943 case SC_Register: return "register";
1944 case SC_Static: return "static";
1945 }
1946
1947 llvm_unreachable("Invalid storage class");
1948 }
1949
VarDecl(Kind DK,ASTContext & C,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,IdentifierInfo * Id,QualType T,TypeSourceInfo * TInfo,StorageClass SC)1950 VarDecl::VarDecl(Kind DK, ASTContext &C, DeclContext *DC,
1951 SourceLocation StartLoc, SourceLocation IdLoc,
1952 IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo,
1953 StorageClass SC)
1954 : DeclaratorDecl(DK, DC, IdLoc, Id, T, TInfo, StartLoc),
1955 redeclarable_base(C) {
1956 static_assert(sizeof(VarDeclBitfields) <= sizeof(unsigned),
1957 "VarDeclBitfields too large!");
1958 static_assert(sizeof(ParmVarDeclBitfields) <= sizeof(unsigned),
1959 "ParmVarDeclBitfields too large!");
1960 static_assert(sizeof(NonParmVarDeclBitfields) <= sizeof(unsigned),
1961 "NonParmVarDeclBitfields too large!");
1962 AllBits = 0;
1963 VarDeclBits.SClass = SC;
1964 // Everything else is implicitly initialized to false.
1965 }
1966
Create(ASTContext & C,DeclContext * DC,SourceLocation StartL,SourceLocation IdL,IdentifierInfo * Id,QualType T,TypeSourceInfo * TInfo,StorageClass S)1967 VarDecl *VarDecl::Create(ASTContext &C, DeclContext *DC,
1968 SourceLocation StartL, SourceLocation IdL,
1969 IdentifierInfo *Id, QualType T, TypeSourceInfo *TInfo,
1970 StorageClass S) {
1971 return new (C, DC) VarDecl(Var, C, DC, StartL, IdL, Id, T, TInfo, S);
1972 }
1973
CreateDeserialized(ASTContext & C,unsigned ID)1974 VarDecl *VarDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
1975 return new (C, ID)
1976 VarDecl(Var, C, nullptr, SourceLocation(), SourceLocation(), nullptr,
1977 QualType(), nullptr, SC_None);
1978 }
1979
setStorageClass(StorageClass SC)1980 void VarDecl::setStorageClass(StorageClass SC) {
1981 assert(isLegalForVariable(SC));
1982 VarDeclBits.SClass = SC;
1983 }
1984
getTLSKind() const1985 VarDecl::TLSKind VarDecl::getTLSKind() const {
1986 switch (VarDeclBits.TSCSpec) {
1987 case TSCS_unspecified:
1988 if (!hasAttr<ThreadAttr>() &&
1989 !(getASTContext().getLangOpts().OpenMPUseTLS &&
1990 getASTContext().getTargetInfo().isTLSSupported() &&
1991 hasAttr<OMPThreadPrivateDeclAttr>()))
1992 return TLS_None;
1993 return ((getASTContext().getLangOpts().isCompatibleWithMSVC(
1994 LangOptions::MSVC2015)) ||
1995 hasAttr<OMPThreadPrivateDeclAttr>())
1996 ? TLS_Dynamic
1997 : TLS_Static;
1998 case TSCS___thread: // Fall through.
1999 case TSCS__Thread_local:
2000 return TLS_Static;
2001 case TSCS_thread_local:
2002 return TLS_Dynamic;
2003 }
2004 llvm_unreachable("Unknown thread storage class specifier!");
2005 }
2006
getSourceRange() const2007 SourceRange VarDecl::getSourceRange() const {
2008 if (const Expr *Init = getInit()) {
2009 SourceLocation InitEnd = Init->getEndLoc();
2010 // If Init is implicit, ignore its source range and fallback on
2011 // DeclaratorDecl::getSourceRange() to handle postfix elements.
2012 if (InitEnd.isValid() && InitEnd != getLocation())
2013 return SourceRange(getOuterLocStart(), InitEnd);
2014 }
2015 return DeclaratorDecl::getSourceRange();
2016 }
2017
2018 template<typename T>
getDeclLanguageLinkage(const T & D)2019 static LanguageLinkage getDeclLanguageLinkage(const T &D) {
2020 // C++ [dcl.link]p1: All function types, function names with external linkage,
2021 // and variable names with external linkage have a language linkage.
2022 if (!D.hasExternalFormalLinkage())
2023 return NoLanguageLinkage;
2024
2025 // Language linkage is a C++ concept, but saying that everything else in C has
2026 // C language linkage fits the implementation nicely.
2027 ASTContext &Context = D.getASTContext();
2028 if (!Context.getLangOpts().CPlusPlus)
2029 return CLanguageLinkage;
2030
2031 // C++ [dcl.link]p4: A C language linkage is ignored in determining the
2032 // language linkage of the names of class members and the function type of
2033 // class member functions.
2034 const DeclContext *DC = D.getDeclContext();
2035 if (DC->isRecord())
2036 return CXXLanguageLinkage;
2037
2038 // If the first decl is in an extern "C" context, any other redeclaration
2039 // will have C language linkage. If the first one is not in an extern "C"
2040 // context, we would have reported an error for any other decl being in one.
2041 if (isFirstInExternCContext(&D))
2042 return CLanguageLinkage;
2043 return CXXLanguageLinkage;
2044 }
2045
2046 template<typename T>
isDeclExternC(const T & D)2047 static bool isDeclExternC(const T &D) {
2048 // Since the context is ignored for class members, they can only have C++
2049 // language linkage or no language linkage.
2050 const DeclContext *DC = D.getDeclContext();
2051 if (DC->isRecord()) {
2052 assert(D.getASTContext().getLangOpts().CPlusPlus);
2053 return false;
2054 }
2055
2056 return D.getLanguageLinkage() == CLanguageLinkage;
2057 }
2058
getLanguageLinkage() const2059 LanguageLinkage VarDecl::getLanguageLinkage() const {
2060 return getDeclLanguageLinkage(*this);
2061 }
2062
isExternC() const2063 bool VarDecl::isExternC() const {
2064 return isDeclExternC(*this);
2065 }
2066
isInExternCContext() const2067 bool VarDecl::isInExternCContext() const {
2068 return getLexicalDeclContext()->isExternCContext();
2069 }
2070
isInExternCXXContext() const2071 bool VarDecl::isInExternCXXContext() const {
2072 return getLexicalDeclContext()->isExternCXXContext();
2073 }
2074
getCanonicalDecl()2075 VarDecl *VarDecl::getCanonicalDecl() { return getFirstDecl(); }
2076
2077 VarDecl::DefinitionKind
isThisDeclarationADefinition(ASTContext & C) const2078 VarDecl::isThisDeclarationADefinition(ASTContext &C) const {
2079 if (isThisDeclarationADemotedDefinition())
2080 return DeclarationOnly;
2081
2082 // C++ [basic.def]p2:
2083 // A declaration is a definition unless [...] it contains the 'extern'
2084 // specifier or a linkage-specification and neither an initializer [...],
2085 // it declares a non-inline static data member in a class declaration [...],
2086 // it declares a static data member outside a class definition and the variable
2087 // was defined within the class with the constexpr specifier [...],
2088 // C++1y [temp.expl.spec]p15:
2089 // An explicit specialization of a static data member or an explicit
2090 // specialization of a static data member template is a definition if the
2091 // declaration includes an initializer; otherwise, it is a declaration.
2092 //
2093 // FIXME: How do you declare (but not define) a partial specialization of
2094 // a static data member template outside the containing class?
2095 if (isStaticDataMember()) {
2096 if (isOutOfLine() &&
2097 !(getCanonicalDecl()->isInline() &&
2098 getCanonicalDecl()->isConstexpr()) &&
2099 (hasInit() ||
2100 // If the first declaration is out-of-line, this may be an
2101 // instantiation of an out-of-line partial specialization of a variable
2102 // template for which we have not yet instantiated the initializer.
2103 (getFirstDecl()->isOutOfLine()
2104 ? getTemplateSpecializationKind() == TSK_Undeclared
2105 : getTemplateSpecializationKind() !=
2106 TSK_ExplicitSpecialization) ||
2107 isa<VarTemplatePartialSpecializationDecl>(this)))
2108 return Definition;
2109 else if (!isOutOfLine() && isInline())
2110 return Definition;
2111 else
2112 return DeclarationOnly;
2113 }
2114 // C99 6.7p5:
2115 // A definition of an identifier is a declaration for that identifier that
2116 // [...] causes storage to be reserved for that object.
2117 // Note: that applies for all non-file-scope objects.
2118 // C99 6.9.2p1:
2119 // If the declaration of an identifier for an object has file scope and an
2120 // initializer, the declaration is an external definition for the identifier
2121 if (hasInit())
2122 return Definition;
2123
2124 if (hasDefiningAttr())
2125 return Definition;
2126
2127 if (const auto *SAA = getAttr<SelectAnyAttr>())
2128 if (!SAA->isInherited())
2129 return Definition;
2130
2131 // A variable template specialization (other than a static data member
2132 // template or an explicit specialization) is a declaration until we
2133 // instantiate its initializer.
2134 if (auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(this)) {
2135 if (VTSD->getTemplateSpecializationKind() != TSK_ExplicitSpecialization &&
2136 !isa<VarTemplatePartialSpecializationDecl>(VTSD) &&
2137 !VTSD->IsCompleteDefinition)
2138 return DeclarationOnly;
2139 }
2140
2141 if (hasExternalStorage())
2142 return DeclarationOnly;
2143
2144 // [dcl.link] p7:
2145 // A declaration directly contained in a linkage-specification is treated
2146 // as if it contains the extern specifier for the purpose of determining
2147 // the linkage of the declared name and whether it is a definition.
2148 if (isSingleLineLanguageLinkage(*this))
2149 return DeclarationOnly;
2150
2151 // C99 6.9.2p2:
2152 // A declaration of an object that has file scope without an initializer,
2153 // and without a storage class specifier or the scs 'static', constitutes
2154 // a tentative definition.
2155 // No such thing in C++.
2156 if (!C.getLangOpts().CPlusPlus && isFileVarDecl())
2157 return TentativeDefinition;
2158
2159 // What's left is (in C, block-scope) declarations without initializers or
2160 // external storage. These are definitions.
2161 return Definition;
2162 }
2163
getActingDefinition()2164 VarDecl *VarDecl::getActingDefinition() {
2165 DefinitionKind Kind = isThisDeclarationADefinition();
2166 if (Kind != TentativeDefinition)
2167 return nullptr;
2168
2169 VarDecl *LastTentative = nullptr;
2170 VarDecl *First = getFirstDecl();
2171 for (auto I : First->redecls()) {
2172 Kind = I->isThisDeclarationADefinition();
2173 if (Kind == Definition)
2174 return nullptr;
2175 else if (Kind == TentativeDefinition)
2176 LastTentative = I;
2177 }
2178 return LastTentative;
2179 }
2180
getDefinition(ASTContext & C)2181 VarDecl *VarDecl::getDefinition(ASTContext &C) {
2182 VarDecl *First = getFirstDecl();
2183 for (auto I : First->redecls()) {
2184 if (I->isThisDeclarationADefinition(C) == Definition)
2185 return I;
2186 }
2187 return nullptr;
2188 }
2189
hasDefinition(ASTContext & C) const2190 VarDecl::DefinitionKind VarDecl::hasDefinition(ASTContext &C) const {
2191 DefinitionKind Kind = DeclarationOnly;
2192
2193 const VarDecl *First = getFirstDecl();
2194 for (auto I : First->redecls()) {
2195 Kind = std::max(Kind, I->isThisDeclarationADefinition(C));
2196 if (Kind == Definition)
2197 break;
2198 }
2199
2200 return Kind;
2201 }
2202
getAnyInitializer(const VarDecl * & D) const2203 const Expr *VarDecl::getAnyInitializer(const VarDecl *&D) const {
2204 for (auto I : redecls()) {
2205 if (auto Expr = I->getInit()) {
2206 D = I;
2207 return Expr;
2208 }
2209 }
2210 return nullptr;
2211 }
2212
hasInit() const2213 bool VarDecl::hasInit() const {
2214 if (auto *P = dyn_cast<ParmVarDecl>(this))
2215 if (P->hasUnparsedDefaultArg() || P->hasUninstantiatedDefaultArg())
2216 return false;
2217
2218 return !Init.isNull();
2219 }
2220
getInit()2221 Expr *VarDecl::getInit() {
2222 if (!hasInit())
2223 return nullptr;
2224
2225 if (auto *S = Init.dyn_cast<Stmt *>())
2226 return cast<Expr>(S);
2227
2228 return cast_or_null<Expr>(Init.get<EvaluatedStmt *>()->Value);
2229 }
2230
getInitAddress()2231 Stmt **VarDecl::getInitAddress() {
2232 if (auto *ES = Init.dyn_cast<EvaluatedStmt *>())
2233 return &ES->Value;
2234
2235 return Init.getAddrOfPtr1();
2236 }
2237
getInitializingDeclaration()2238 VarDecl *VarDecl::getInitializingDeclaration() {
2239 VarDecl *Def = nullptr;
2240 for (auto I : redecls()) {
2241 if (I->hasInit())
2242 return I;
2243
2244 if (I->isThisDeclarationADefinition()) {
2245 if (isStaticDataMember())
2246 return I;
2247 else
2248 Def = I;
2249 }
2250 }
2251 return Def;
2252 }
2253
isOutOfLine() const2254 bool VarDecl::isOutOfLine() const {
2255 if (Decl::isOutOfLine())
2256 return true;
2257
2258 if (!isStaticDataMember())
2259 return false;
2260
2261 // If this static data member was instantiated from a static data member of
2262 // a class template, check whether that static data member was defined
2263 // out-of-line.
2264 if (VarDecl *VD = getInstantiatedFromStaticDataMember())
2265 return VD->isOutOfLine();
2266
2267 return false;
2268 }
2269
setInit(Expr * I)2270 void VarDecl::setInit(Expr *I) {
2271 if (auto *Eval = Init.dyn_cast<EvaluatedStmt *>()) {
2272 Eval->~EvaluatedStmt();
2273 getASTContext().Deallocate(Eval);
2274 }
2275
2276 Init = I;
2277 }
2278
mightBeUsableInConstantExpressions(ASTContext & C) const2279 bool VarDecl::mightBeUsableInConstantExpressions(ASTContext &C) const {
2280 const LangOptions &Lang = C.getLangOpts();
2281
2282 if (!Lang.CPlusPlus)
2283 return false;
2284
2285 // Function parameters are never usable in constant expressions.
2286 if (isa<ParmVarDecl>(this))
2287 return false;
2288
2289 // In C++11, any variable of reference type can be used in a constant
2290 // expression if it is initialized by a constant expression.
2291 if (Lang.CPlusPlus11 && getType()->isReferenceType())
2292 return true;
2293
2294 // Only const objects can be used in constant expressions in C++. C++98 does
2295 // not require the variable to be non-volatile, but we consider this to be a
2296 // defect.
2297 if (!getType().isConstQualified() || getType().isVolatileQualified())
2298 return false;
2299
2300 // In C++, const, non-volatile variables of integral or enumeration types
2301 // can be used in constant expressions.
2302 if (getType()->isIntegralOrEnumerationType())
2303 return true;
2304
2305 // Additionally, in C++11, non-volatile constexpr variables can be used in
2306 // constant expressions.
2307 return Lang.CPlusPlus11 && isConstexpr();
2308 }
2309
isUsableInConstantExpressions(ASTContext & Context) const2310 bool VarDecl::isUsableInConstantExpressions(ASTContext &Context) const {
2311 // C++2a [expr.const]p3:
2312 // A variable is usable in constant expressions after its initializing
2313 // declaration is encountered...
2314 const VarDecl *DefVD = nullptr;
2315 const Expr *Init = getAnyInitializer(DefVD);
2316 if (!Init || Init->isValueDependent() || getType()->isDependentType())
2317 return false;
2318 // ... if it is a constexpr variable, or it is of reference type or of
2319 // const-qualified integral or enumeration type, ...
2320 if (!DefVD->mightBeUsableInConstantExpressions(Context))
2321 return false;
2322 // ... and its initializer is a constant initializer.
2323 return DefVD->checkInitIsICE();
2324 }
2325
2326 /// Convert the initializer for this declaration to the elaborated EvaluatedStmt
2327 /// form, which contains extra information on the evaluated value of the
2328 /// initializer.
ensureEvaluatedStmt() const2329 EvaluatedStmt *VarDecl::ensureEvaluatedStmt() const {
2330 auto *Eval = Init.dyn_cast<EvaluatedStmt *>();
2331 if (!Eval) {
2332 // Note: EvaluatedStmt contains an APValue, which usually holds
2333 // resources not allocated from the ASTContext. We need to do some
2334 // work to avoid leaking those, but we do so in VarDecl::evaluateValue
2335 // where we can detect whether there's anything to clean up or not.
2336 Eval = new (getASTContext()) EvaluatedStmt;
2337 Eval->Value = Init.get<Stmt *>();
2338 Init = Eval;
2339 }
2340 return Eval;
2341 }
2342
evaluateValue() const2343 APValue *VarDecl::evaluateValue() const {
2344 SmallVector<PartialDiagnosticAt, 8> Notes;
2345 return evaluateValue(Notes);
2346 }
2347
evaluateValue(SmallVectorImpl<PartialDiagnosticAt> & Notes) const2348 APValue *VarDecl::evaluateValue(
2349 SmallVectorImpl<PartialDiagnosticAt> &Notes) const {
2350 EvaluatedStmt *Eval = ensureEvaluatedStmt();
2351
2352 // We only produce notes indicating why an initializer is non-constant the
2353 // first time it is evaluated. FIXME: The notes won't always be emitted the
2354 // first time we try evaluation, so might not be produced at all.
2355 if (Eval->WasEvaluated)
2356 return Eval->Evaluated.isAbsent() ? nullptr : &Eval->Evaluated;
2357
2358 const auto *Init = cast<Expr>(Eval->Value);
2359 assert(!Init->isValueDependent());
2360
2361 if (Eval->IsEvaluating) {
2362 // FIXME: Produce a diagnostic for self-initialization.
2363 Eval->CheckedICE = true;
2364 Eval->IsICE = false;
2365 return nullptr;
2366 }
2367
2368 Eval->IsEvaluating = true;
2369
2370 bool Result = Init->EvaluateAsInitializer(Eval->Evaluated, getASTContext(),
2371 this, Notes);
2372
2373 // Ensure the computed APValue is cleaned up later if evaluation succeeded,
2374 // or that it's empty (so that there's nothing to clean up) if evaluation
2375 // failed.
2376 if (!Result)
2377 Eval->Evaluated = APValue();
2378 else if (Eval->Evaluated.needsCleanup())
2379 getASTContext().addDestruction(&Eval->Evaluated);
2380
2381 Eval->IsEvaluating = false;
2382 Eval->WasEvaluated = true;
2383
2384 // In C++11, we have determined whether the initializer was a constant
2385 // expression as a side-effect.
2386 if (getASTContext().getLangOpts().CPlusPlus11 && !Eval->CheckedICE) {
2387 Eval->CheckedICE = true;
2388 Eval->IsICE = Result && Notes.empty();
2389 }
2390
2391 return Result ? &Eval->Evaluated : nullptr;
2392 }
2393
getEvaluatedValue() const2394 APValue *VarDecl::getEvaluatedValue() const {
2395 if (EvaluatedStmt *Eval = Init.dyn_cast<EvaluatedStmt *>())
2396 if (Eval->WasEvaluated)
2397 return &Eval->Evaluated;
2398
2399 return nullptr;
2400 }
2401
isInitKnownICE() const2402 bool VarDecl::isInitKnownICE() const {
2403 if (EvaluatedStmt *Eval = Init.dyn_cast<EvaluatedStmt *>())
2404 return Eval->CheckedICE;
2405
2406 return false;
2407 }
2408
isInitICE() const2409 bool VarDecl::isInitICE() const {
2410 assert(isInitKnownICE() &&
2411 "Check whether we already know that the initializer is an ICE");
2412 return Init.get<EvaluatedStmt *>()->IsICE;
2413 }
2414
checkInitIsICE() const2415 bool VarDecl::checkInitIsICE() const {
2416 // Initializers of weak variables are never ICEs.
2417 if (isWeak())
2418 return false;
2419
2420 EvaluatedStmt *Eval = ensureEvaluatedStmt();
2421 if (Eval->CheckedICE)
2422 // We have already checked whether this subexpression is an
2423 // integral constant expression.
2424 return Eval->IsICE;
2425
2426 const auto *Init = cast<Expr>(Eval->Value);
2427 // XXXAR: Hack to fix crash when compiling some code:
2428 if (Init->isValueDependent())
2429 return false;
2430 // XXXAR: should probably fix this properly instead
2431 assert(!Init->isValueDependent());
2432
2433 // In C++11, evaluate the initializer to check whether it's a constant
2434 // expression.
2435 if (getASTContext().getLangOpts().CPlusPlus11) {
2436 SmallVector<PartialDiagnosticAt, 8> Notes;
2437 evaluateValue(Notes);
2438 return Eval->IsICE;
2439 }
2440
2441 // It's an ICE whether or not the definition we found is
2442 // out-of-line. See DR 721 and the discussion in Clang PR
2443 // 6206 for details.
2444
2445 if (Eval->CheckingICE)
2446 return false;
2447 Eval->CheckingICE = true;
2448
2449 Eval->IsICE = Init->isIntegerConstantExpr(getASTContext());
2450 Eval->CheckingICE = false;
2451 Eval->CheckedICE = true;
2452 return Eval->IsICE;
2453 }
2454
isParameterPack() const2455 bool VarDecl::isParameterPack() const {
2456 return isa<PackExpansionType>(getType());
2457 }
2458
2459 template<typename DeclT>
getDefinitionOrSelf(DeclT * D)2460 static DeclT *getDefinitionOrSelf(DeclT *D) {
2461 assert(D);
2462 if (auto *Def = D->getDefinition())
2463 return Def;
2464 return D;
2465 }
2466
isEscapingByref() const2467 bool VarDecl::isEscapingByref() const {
2468 return hasAttr<BlocksAttr>() && NonParmVarDeclBits.EscapingByref;
2469 }
2470
isNonEscapingByref() const2471 bool VarDecl::isNonEscapingByref() const {
2472 return hasAttr<BlocksAttr>() && !NonParmVarDeclBits.EscapingByref;
2473 }
2474
getTemplateInstantiationPattern() const2475 VarDecl *VarDecl::getTemplateInstantiationPattern() const {
2476 const VarDecl *VD = this;
2477
2478 // If this is an instantiated member, walk back to the template from which
2479 // it was instantiated.
2480 if (MemberSpecializationInfo *MSInfo = VD->getMemberSpecializationInfo()) {
2481 if (isTemplateInstantiation(MSInfo->getTemplateSpecializationKind())) {
2482 VD = VD->getInstantiatedFromStaticDataMember();
2483 while (auto *NewVD = VD->getInstantiatedFromStaticDataMember())
2484 VD = NewVD;
2485 }
2486 }
2487
2488 // If it's an instantiated variable template specialization, find the
2489 // template or partial specialization from which it was instantiated.
2490 if (auto *VDTemplSpec = dyn_cast<VarTemplateSpecializationDecl>(VD)) {
2491 if (isTemplateInstantiation(VDTemplSpec->getTemplateSpecializationKind())) {
2492 auto From = VDTemplSpec->getInstantiatedFrom();
2493 if (auto *VTD = From.dyn_cast<VarTemplateDecl *>()) {
2494 while (!VTD->isMemberSpecialization()) {
2495 auto *NewVTD = VTD->getInstantiatedFromMemberTemplate();
2496 if (!NewVTD)
2497 break;
2498 VTD = NewVTD;
2499 }
2500 return getDefinitionOrSelf(VTD->getTemplatedDecl());
2501 }
2502 if (auto *VTPSD =
2503 From.dyn_cast<VarTemplatePartialSpecializationDecl *>()) {
2504 while (!VTPSD->isMemberSpecialization()) {
2505 auto *NewVTPSD = VTPSD->getInstantiatedFromMember();
2506 if (!NewVTPSD)
2507 break;
2508 VTPSD = NewVTPSD;
2509 }
2510 return getDefinitionOrSelf<VarDecl>(VTPSD);
2511 }
2512 }
2513 }
2514
2515 // If this is the pattern of a variable template, find where it was
2516 // instantiated from. FIXME: Is this necessary?
2517 if (VarTemplateDecl *VarTemplate = VD->getDescribedVarTemplate()) {
2518 while (!VarTemplate->isMemberSpecialization()) {
2519 auto *NewVT = VarTemplate->getInstantiatedFromMemberTemplate();
2520 if (!NewVT)
2521 break;
2522 VarTemplate = NewVT;
2523 }
2524
2525 return getDefinitionOrSelf(VarTemplate->getTemplatedDecl());
2526 }
2527
2528 if (VD == this)
2529 return nullptr;
2530 return getDefinitionOrSelf(const_cast<VarDecl*>(VD));
2531 }
2532
getInstantiatedFromStaticDataMember() const2533 VarDecl *VarDecl::getInstantiatedFromStaticDataMember() const {
2534 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2535 return cast<VarDecl>(MSI->getInstantiatedFrom());
2536
2537 return nullptr;
2538 }
2539
getTemplateSpecializationKind() const2540 TemplateSpecializationKind VarDecl::getTemplateSpecializationKind() const {
2541 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
2542 return Spec->getSpecializationKind();
2543
2544 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2545 return MSI->getTemplateSpecializationKind();
2546
2547 return TSK_Undeclared;
2548 }
2549
2550 TemplateSpecializationKind
getTemplateSpecializationKindForInstantiation() const2551 VarDecl::getTemplateSpecializationKindForInstantiation() const {
2552 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2553 return MSI->getTemplateSpecializationKind();
2554
2555 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
2556 return Spec->getSpecializationKind();
2557
2558 return TSK_Undeclared;
2559 }
2560
getPointOfInstantiation() const2561 SourceLocation VarDecl::getPointOfInstantiation() const {
2562 if (const auto *Spec = dyn_cast<VarTemplateSpecializationDecl>(this))
2563 return Spec->getPointOfInstantiation();
2564
2565 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
2566 return MSI->getPointOfInstantiation();
2567
2568 return SourceLocation();
2569 }
2570
getDescribedVarTemplate() const2571 VarTemplateDecl *VarDecl::getDescribedVarTemplate() const {
2572 return getASTContext().getTemplateOrSpecializationInfo(this)
2573 .dyn_cast<VarTemplateDecl *>();
2574 }
2575
setDescribedVarTemplate(VarTemplateDecl * Template)2576 void VarDecl::setDescribedVarTemplate(VarTemplateDecl *Template) {
2577 getASTContext().setTemplateOrSpecializationInfo(this, Template);
2578 }
2579
isKnownToBeDefined() const2580 bool VarDecl::isKnownToBeDefined() const {
2581 const auto &LangOpts = getASTContext().getLangOpts();
2582 // In CUDA mode without relocatable device code, variables of form 'extern
2583 // __shared__ Foo foo[]' are pointers to the base of the GPU core's shared
2584 // memory pool. These are never undefined variables, even if they appear
2585 // inside of an anon namespace or static function.
2586 //
2587 // With CUDA relocatable device code enabled, these variables don't get
2588 // special handling; they're treated like regular extern variables.
2589 if (LangOpts.CUDA && !LangOpts.GPURelocatableDeviceCode &&
2590 hasExternalStorage() && hasAttr<CUDASharedAttr>() &&
2591 isa<IncompleteArrayType>(getType()))
2592 return true;
2593
2594 return hasDefinition();
2595 }
2596
isNoDestroy(const ASTContext & Ctx) const2597 bool VarDecl::isNoDestroy(const ASTContext &Ctx) const {
2598 return hasGlobalStorage() && (hasAttr<NoDestroyAttr>() ||
2599 (!Ctx.getLangOpts().RegisterStaticDestructors &&
2600 !hasAttr<AlwaysDestroyAttr>()));
2601 }
2602
2603 QualType::DestructionKind
needsDestruction(const ASTContext & Ctx) const2604 VarDecl::needsDestruction(const ASTContext &Ctx) const {
2605 if (EvaluatedStmt *Eval = Init.dyn_cast<EvaluatedStmt *>())
2606 if (Eval->HasConstantDestruction)
2607 return QualType::DK_none;
2608
2609 if (isNoDestroy(Ctx))
2610 return QualType::DK_none;
2611
2612 return getType().isDestructedType();
2613 }
2614
getMemberSpecializationInfo() const2615 MemberSpecializationInfo *VarDecl::getMemberSpecializationInfo() const {
2616 if (isStaticDataMember())
2617 // FIXME: Remove ?
2618 // return getASTContext().getInstantiatedFromStaticDataMember(this);
2619 return getASTContext().getTemplateOrSpecializationInfo(this)
2620 .dyn_cast<MemberSpecializationInfo *>();
2621 return nullptr;
2622 }
2623
setTemplateSpecializationKind(TemplateSpecializationKind TSK,SourceLocation PointOfInstantiation)2624 void VarDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
2625 SourceLocation PointOfInstantiation) {
2626 assert((isa<VarTemplateSpecializationDecl>(this) ||
2627 getMemberSpecializationInfo()) &&
2628 "not a variable or static data member template specialization");
2629
2630 if (VarTemplateSpecializationDecl *Spec =
2631 dyn_cast<VarTemplateSpecializationDecl>(this)) {
2632 Spec->setSpecializationKind(TSK);
2633 if (TSK != TSK_ExplicitSpecialization &&
2634 PointOfInstantiation.isValid() &&
2635 Spec->getPointOfInstantiation().isInvalid()) {
2636 Spec->setPointOfInstantiation(PointOfInstantiation);
2637 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
2638 L->InstantiationRequested(this);
2639 }
2640 } else if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo()) {
2641 MSI->setTemplateSpecializationKind(TSK);
2642 if (TSK != TSK_ExplicitSpecialization && PointOfInstantiation.isValid() &&
2643 MSI->getPointOfInstantiation().isInvalid()) {
2644 MSI->setPointOfInstantiation(PointOfInstantiation);
2645 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
2646 L->InstantiationRequested(this);
2647 }
2648 }
2649 }
2650
2651 void
setInstantiationOfStaticDataMember(VarDecl * VD,TemplateSpecializationKind TSK)2652 VarDecl::setInstantiationOfStaticDataMember(VarDecl *VD,
2653 TemplateSpecializationKind TSK) {
2654 assert(getASTContext().getTemplateOrSpecializationInfo(this).isNull() &&
2655 "Previous template or instantiation?");
2656 getASTContext().setInstantiatedFromStaticDataMember(this, VD, TSK);
2657 }
2658
2659 //===----------------------------------------------------------------------===//
2660 // ParmVarDecl Implementation
2661 //===----------------------------------------------------------------------===//
2662
Create(ASTContext & C,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,IdentifierInfo * Id,QualType T,TypeSourceInfo * TInfo,StorageClass S,Expr * DefArg)2663 ParmVarDecl *ParmVarDecl::Create(ASTContext &C, DeclContext *DC,
2664 SourceLocation StartLoc,
2665 SourceLocation IdLoc, IdentifierInfo *Id,
2666 QualType T, TypeSourceInfo *TInfo,
2667 StorageClass S, Expr *DefArg) {
2668 return new (C, DC) ParmVarDecl(ParmVar, C, DC, StartLoc, IdLoc, Id, T, TInfo,
2669 S, DefArg);
2670 }
2671
getOriginalType() const2672 QualType ParmVarDecl::getOriginalType() const {
2673 TypeSourceInfo *TSI = getTypeSourceInfo();
2674 QualType T = TSI ? TSI->getType() : getType();
2675 if (const auto *DT = dyn_cast<DecayedType>(T))
2676 return DT->getOriginalType();
2677 return T;
2678 }
2679
CreateDeserialized(ASTContext & C,unsigned ID)2680 ParmVarDecl *ParmVarDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
2681 return new (C, ID)
2682 ParmVarDecl(ParmVar, C, nullptr, SourceLocation(), SourceLocation(),
2683 nullptr, QualType(), nullptr, SC_None, nullptr);
2684 }
2685
getSourceRange() const2686 SourceRange ParmVarDecl::getSourceRange() const {
2687 if (!hasInheritedDefaultArg()) {
2688 SourceRange ArgRange = getDefaultArgRange();
2689 if (ArgRange.isValid())
2690 return SourceRange(getOuterLocStart(), ArgRange.getEnd());
2691 }
2692
2693 // DeclaratorDecl considers the range of postfix types as overlapping with the
2694 // declaration name, but this is not the case with parameters in ObjC methods.
2695 if (isa<ObjCMethodDecl>(getDeclContext()))
2696 return SourceRange(DeclaratorDecl::getBeginLoc(), getLocation());
2697
2698 return DeclaratorDecl::getSourceRange();
2699 }
2700
getDefaultArg()2701 Expr *ParmVarDecl::getDefaultArg() {
2702 assert(!hasUnparsedDefaultArg() && "Default argument is not yet parsed!");
2703 assert(!hasUninstantiatedDefaultArg() &&
2704 "Default argument is not yet instantiated!");
2705
2706 Expr *Arg = getInit();
2707 if (auto *E = dyn_cast_or_null<FullExpr>(Arg))
2708 return E->getSubExpr();
2709
2710 return Arg;
2711 }
2712
setDefaultArg(Expr * defarg)2713 void ParmVarDecl::setDefaultArg(Expr *defarg) {
2714 ParmVarDeclBits.DefaultArgKind = DAK_Normal;
2715 Init = defarg;
2716 }
2717
getDefaultArgRange() const2718 SourceRange ParmVarDecl::getDefaultArgRange() const {
2719 switch (ParmVarDeclBits.DefaultArgKind) {
2720 case DAK_None:
2721 case DAK_Unparsed:
2722 // Nothing we can do here.
2723 return SourceRange();
2724
2725 case DAK_Uninstantiated:
2726 return getUninstantiatedDefaultArg()->getSourceRange();
2727
2728 case DAK_Normal:
2729 if (const Expr *E = getInit())
2730 return E->getSourceRange();
2731
2732 // Missing an actual expression, may be invalid.
2733 return SourceRange();
2734 }
2735 llvm_unreachable("Invalid default argument kind.");
2736 }
2737
setUninstantiatedDefaultArg(Expr * arg)2738 void ParmVarDecl::setUninstantiatedDefaultArg(Expr *arg) {
2739 ParmVarDeclBits.DefaultArgKind = DAK_Uninstantiated;
2740 Init = arg;
2741 }
2742
getUninstantiatedDefaultArg()2743 Expr *ParmVarDecl::getUninstantiatedDefaultArg() {
2744 assert(hasUninstantiatedDefaultArg() &&
2745 "Wrong kind of initialization expression!");
2746 return cast_or_null<Expr>(Init.get<Stmt *>());
2747 }
2748
hasDefaultArg() const2749 bool ParmVarDecl::hasDefaultArg() const {
2750 // FIXME: We should just return false for DAK_None here once callers are
2751 // prepared for the case that we encountered an invalid default argument and
2752 // were unable to even build an invalid expression.
2753 return hasUnparsedDefaultArg() || hasUninstantiatedDefaultArg() ||
2754 !Init.isNull();
2755 }
2756
setParameterIndexLarge(unsigned parameterIndex)2757 void ParmVarDecl::setParameterIndexLarge(unsigned parameterIndex) {
2758 getASTContext().setParameterIndex(this, parameterIndex);
2759 ParmVarDeclBits.ParameterIndex = ParameterIndexSentinel;
2760 }
2761
getParameterIndexLarge() const2762 unsigned ParmVarDecl::getParameterIndexLarge() const {
2763 return getASTContext().getParameterIndex(this);
2764 }
2765
2766 //===----------------------------------------------------------------------===//
2767 // FunctionDecl Implementation
2768 //===----------------------------------------------------------------------===//
2769
FunctionDecl(Kind DK,ASTContext & C,DeclContext * DC,SourceLocation StartLoc,const DeclarationNameInfo & NameInfo,QualType T,TypeSourceInfo * TInfo,StorageClass S,bool isInlineSpecified,ConstexprSpecKind ConstexprKind,Expr * TrailingRequiresClause)2770 FunctionDecl::FunctionDecl(Kind DK, ASTContext &C, DeclContext *DC,
2771 SourceLocation StartLoc,
2772 const DeclarationNameInfo &NameInfo, QualType T,
2773 TypeSourceInfo *TInfo, StorageClass S,
2774 bool isInlineSpecified,
2775 ConstexprSpecKind ConstexprKind,
2776 Expr *TrailingRequiresClause)
2777 : DeclaratorDecl(DK, DC, NameInfo.getLoc(), NameInfo.getName(), T, TInfo,
2778 StartLoc),
2779 DeclContext(DK), redeclarable_base(C), Body(), ODRHash(0),
2780 EndRangeLoc(NameInfo.getEndLoc()), DNLoc(NameInfo.getInfo()) {
2781 assert(T.isNull() || T->isFunctionType());
2782 FunctionDeclBits.SClass = S;
2783 FunctionDeclBits.IsInline = isInlineSpecified;
2784 FunctionDeclBits.IsInlineSpecified = isInlineSpecified;
2785 FunctionDeclBits.IsVirtualAsWritten = false;
2786 FunctionDeclBits.IsPure = false;
2787 FunctionDeclBits.HasInheritedPrototype = false;
2788 FunctionDeclBits.HasWrittenPrototype = true;
2789 FunctionDeclBits.IsDeleted = false;
2790 FunctionDeclBits.IsTrivial = false;
2791 FunctionDeclBits.IsTrivialForCall = false;
2792 FunctionDeclBits.IsDefaulted = false;
2793 FunctionDeclBits.IsExplicitlyDefaulted = false;
2794 FunctionDeclBits.HasDefaultedFunctionInfo = false;
2795 FunctionDeclBits.HasImplicitReturnZero = false;
2796 FunctionDeclBits.IsLateTemplateParsed = false;
2797 FunctionDeclBits.ConstexprKind = ConstexprKind;
2798 FunctionDeclBits.InstantiationIsPending = false;
2799 FunctionDeclBits.UsesSEHTry = false;
2800 FunctionDeclBits.UsesFPIntrin = false;
2801 FunctionDeclBits.HasSkippedBody = false;
2802 FunctionDeclBits.WillHaveBody = false;
2803 FunctionDeclBits.IsMultiVersion = false;
2804 FunctionDeclBits.IsCopyDeductionCandidate = false;
2805 FunctionDeclBits.HasODRHash = false;
2806 if (TrailingRequiresClause)
2807 setTrailingRequiresClause(TrailingRequiresClause);
2808 }
2809
getNameForDiagnostic(raw_ostream & OS,const PrintingPolicy & Policy,bool Qualified) const2810 void FunctionDecl::getNameForDiagnostic(
2811 raw_ostream &OS, const PrintingPolicy &Policy, bool Qualified) const {
2812 NamedDecl::getNameForDiagnostic(OS, Policy, Qualified);
2813 const TemplateArgumentList *TemplateArgs = getTemplateSpecializationArgs();
2814 if (TemplateArgs)
2815 printTemplateArgumentList(OS, TemplateArgs->asArray(), Policy);
2816 }
2817
isVariadic() const2818 bool FunctionDecl::isVariadic() const {
2819 if (const auto *FT = getType()->getAs<FunctionProtoType>())
2820 return FT->isVariadic();
2821 return false;
2822 }
2823
2824 FunctionDecl::DefaultedFunctionInfo *
Create(ASTContext & Context,ArrayRef<DeclAccessPair> Lookups)2825 FunctionDecl::DefaultedFunctionInfo::Create(ASTContext &Context,
2826 ArrayRef<DeclAccessPair> Lookups) {
2827 DefaultedFunctionInfo *Info = new (Context.Allocate(
2828 totalSizeToAlloc<DeclAccessPair>(Lookups.size()),
2829 std::max(alignof(DefaultedFunctionInfo), alignof(DeclAccessPair))))
2830 DefaultedFunctionInfo;
2831 Info->NumLookups = Lookups.size();
2832 std::uninitialized_copy(Lookups.begin(), Lookups.end(),
2833 Info->getTrailingObjects<DeclAccessPair>());
2834 return Info;
2835 }
2836
setDefaultedFunctionInfo(DefaultedFunctionInfo * Info)2837 void FunctionDecl::setDefaultedFunctionInfo(DefaultedFunctionInfo *Info) {
2838 assert(!FunctionDeclBits.HasDefaultedFunctionInfo && "already have this");
2839 assert(!Body && "can't replace function body with defaulted function info");
2840
2841 FunctionDeclBits.HasDefaultedFunctionInfo = true;
2842 DefaultedInfo = Info;
2843 }
2844
2845 FunctionDecl::DefaultedFunctionInfo *
getDefaultedFunctionInfo() const2846 FunctionDecl::getDefaultedFunctionInfo() const {
2847 return FunctionDeclBits.HasDefaultedFunctionInfo ? DefaultedInfo : nullptr;
2848 }
2849
hasBody(const FunctionDecl * & Definition) const2850 bool FunctionDecl::hasBody(const FunctionDecl *&Definition) const {
2851 for (auto I : redecls()) {
2852 if (I->doesThisDeclarationHaveABody()) {
2853 Definition = I;
2854 return true;
2855 }
2856 }
2857
2858 return false;
2859 }
2860
hasTrivialBody() const2861 bool FunctionDecl::hasTrivialBody() const {
2862 Stmt *S = getBody();
2863 if (!S) {
2864 // Since we don't have a body for this function, we don't know if it's
2865 // trivial or not.
2866 return false;
2867 }
2868
2869 if (isa<CompoundStmt>(S) && cast<CompoundStmt>(S)->body_empty())
2870 return true;
2871 return false;
2872 }
2873
isDefined(const FunctionDecl * & Definition) const2874 bool FunctionDecl::isDefined(const FunctionDecl *&Definition) const {
2875 for (auto I : redecls()) {
2876 if (I->isThisDeclarationADefinition()) {
2877 Definition = I;
2878 return true;
2879 }
2880 }
2881
2882 return false;
2883 }
2884
getBody(const FunctionDecl * & Definition) const2885 Stmt *FunctionDecl::getBody(const FunctionDecl *&Definition) const {
2886 if (!hasBody(Definition))
2887 return nullptr;
2888
2889 assert(!Definition->FunctionDeclBits.HasDefaultedFunctionInfo &&
2890 "definition should not have a body");
2891 if (Definition->Body)
2892 return Definition->Body.get(getASTContext().getExternalSource());
2893
2894 return nullptr;
2895 }
2896
setBody(Stmt * B)2897 void FunctionDecl::setBody(Stmt *B) {
2898 FunctionDeclBits.HasDefaultedFunctionInfo = false;
2899 Body = LazyDeclStmtPtr(B);
2900 if (B)
2901 EndRangeLoc = B->getEndLoc();
2902 }
2903
setPure(bool P)2904 void FunctionDecl::setPure(bool P) {
2905 FunctionDeclBits.IsPure = P;
2906 if (P)
2907 if (auto *Parent = dyn_cast<CXXRecordDecl>(getDeclContext()))
2908 Parent->markedVirtualFunctionPure();
2909 }
2910
2911 template<std::size_t Len>
isNamed(const NamedDecl * ND,const char (& Str)[Len])2912 static bool isNamed(const NamedDecl *ND, const char (&Str)[Len]) {
2913 IdentifierInfo *II = ND->getIdentifier();
2914 return II && II->isStr(Str);
2915 }
2916
isMain() const2917 bool FunctionDecl::isMain() const {
2918 const TranslationUnitDecl *tunit =
2919 dyn_cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext());
2920 return tunit &&
2921 !tunit->getASTContext().getLangOpts().Freestanding &&
2922 isNamed(this, "main");
2923 }
2924
isMSVCRTEntryPoint() const2925 bool FunctionDecl::isMSVCRTEntryPoint() const {
2926 const TranslationUnitDecl *TUnit =
2927 dyn_cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext());
2928 if (!TUnit)
2929 return false;
2930
2931 // Even though we aren't really targeting MSVCRT if we are freestanding,
2932 // semantic analysis for these functions remains the same.
2933
2934 // MSVCRT entry points only exist on MSVCRT targets.
2935 if (!TUnit->getASTContext().getTargetInfo().getTriple().isOSMSVCRT())
2936 return false;
2937
2938 // Nameless functions like constructors cannot be entry points.
2939 if (!getIdentifier())
2940 return false;
2941
2942 return llvm::StringSwitch<bool>(getName())
2943 .Cases("main", // an ANSI console app
2944 "wmain", // a Unicode console App
2945 "WinMain", // an ANSI GUI app
2946 "wWinMain", // a Unicode GUI app
2947 "DllMain", // a DLL
2948 true)
2949 .Default(false);
2950 }
2951
isReservedGlobalPlacementOperator() const2952 bool FunctionDecl::isReservedGlobalPlacementOperator() const {
2953 assert(getDeclName().getNameKind() == DeclarationName::CXXOperatorName);
2954 assert(getDeclName().getCXXOverloadedOperator() == OO_New ||
2955 getDeclName().getCXXOverloadedOperator() == OO_Delete ||
2956 getDeclName().getCXXOverloadedOperator() == OO_Array_New ||
2957 getDeclName().getCXXOverloadedOperator() == OO_Array_Delete);
2958
2959 if (!getDeclContext()->getRedeclContext()->isTranslationUnit())
2960 return false;
2961
2962 const auto *proto = getType()->castAs<FunctionProtoType>();
2963 if (proto->getNumParams() != 2 || proto->isVariadic())
2964 return false;
2965
2966 ASTContext &Context =
2967 cast<TranslationUnitDecl>(getDeclContext()->getRedeclContext())
2968 ->getASTContext();
2969
2970 // The result type and first argument type are constant across all
2971 // these operators. The second argument must be exactly void*.
2972 return (proto->getParamType(1).getCanonicalType() == Context.VoidPtrTy);
2973 }
2974
isReplaceableGlobalAllocationFunction(Optional<unsigned> * AlignmentParam,bool * IsNothrow) const2975 bool FunctionDecl::isReplaceableGlobalAllocationFunction(
2976 Optional<unsigned> *AlignmentParam, bool *IsNothrow) const {
2977 if (getDeclName().getNameKind() != DeclarationName::CXXOperatorName)
2978 return false;
2979 if (getDeclName().getCXXOverloadedOperator() != OO_New &&
2980 getDeclName().getCXXOverloadedOperator() != OO_Delete &&
2981 getDeclName().getCXXOverloadedOperator() != OO_Array_New &&
2982 getDeclName().getCXXOverloadedOperator() != OO_Array_Delete)
2983 return false;
2984
2985 if (isa<CXXRecordDecl>(getDeclContext()))
2986 return false;
2987
2988 // This can only fail for an invalid 'operator new' declaration.
2989 if (!getDeclContext()->getRedeclContext()->isTranslationUnit())
2990 return false;
2991
2992 const auto *FPT = getType()->castAs<FunctionProtoType>();
2993 if (FPT->getNumParams() == 0 || FPT->getNumParams() > 3 || FPT->isVariadic())
2994 return false;
2995
2996 // If this is a single-parameter function, it must be a replaceable global
2997 // allocation or deallocation function.
2998 if (FPT->getNumParams() == 1)
2999 return true;
3000
3001 unsigned Params = 1;
3002 QualType Ty = FPT->getParamType(Params);
3003 ASTContext &Ctx = getASTContext();
3004
3005 auto Consume = [&] {
3006 ++Params;
3007 Ty = Params < FPT->getNumParams() ? FPT->getParamType(Params) : QualType();
3008 };
3009
3010 // In C++14, the next parameter can be a 'std::size_t' for sized delete.
3011 bool IsSizedDelete = false;
3012 if (Ctx.getLangOpts().SizedDeallocation &&
3013 (getDeclName().getCXXOverloadedOperator() == OO_Delete ||
3014 getDeclName().getCXXOverloadedOperator() == OO_Array_Delete) &&
3015 Ctx.hasSameType(Ty, Ctx.getSizeType())) {
3016 IsSizedDelete = true;
3017 Consume();
3018 }
3019
3020 // In C++17, the next parameter can be a 'std::align_val_t' for aligned
3021 // new/delete.
3022 if (Ctx.getLangOpts().AlignedAllocation && !Ty.isNull() && Ty->isAlignValT()) {
3023 Consume();
3024 if (AlignmentParam)
3025 *AlignmentParam = Params;
3026 }
3027
3028 // Finally, if this is not a sized delete, the final parameter can
3029 // be a 'const std::nothrow_t&'.
3030 if (!IsSizedDelete && !Ty.isNull() && Ty->isReferenceType()) {
3031 Ty = Ty->getPointeeType();
3032 if (Ty.getCVRQualifiers() != Qualifiers::Const)
3033 return false;
3034 if (Ty->isNothrowT()) {
3035 if (IsNothrow)
3036 *IsNothrow = true;
3037 Consume();
3038 }
3039 }
3040
3041 return Params == FPT->getNumParams();
3042 }
3043
isInlineBuiltinDeclaration() const3044 bool FunctionDecl::isInlineBuiltinDeclaration() const {
3045 if (!getBuiltinID())
3046 return false;
3047
3048 const FunctionDecl *Definition;
3049 return hasBody(Definition) && Definition->isInlineSpecified();
3050 }
3051
isDestroyingOperatorDelete() const3052 bool FunctionDecl::isDestroyingOperatorDelete() const {
3053 // C++ P0722:
3054 // Within a class C, a single object deallocation function with signature
3055 // (T, std::destroying_delete_t, <more params>)
3056 // is a destroying operator delete.
3057 if (!isa<CXXMethodDecl>(this) || getOverloadedOperator() != OO_Delete ||
3058 getNumParams() < 2)
3059 return false;
3060
3061 auto *RD = getParamDecl(1)->getType()->getAsCXXRecordDecl();
3062 return RD && RD->isInStdNamespace() && RD->getIdentifier() &&
3063 RD->getIdentifier()->isStr("destroying_delete_t");
3064 }
3065
getLanguageLinkage() const3066 LanguageLinkage FunctionDecl::getLanguageLinkage() const {
3067 return getDeclLanguageLinkage(*this);
3068 }
3069
isExternC() const3070 bool FunctionDecl::isExternC() const {
3071 return isDeclExternC(*this);
3072 }
3073
isInExternCContext() const3074 bool FunctionDecl::isInExternCContext() const {
3075 if (hasAttr<OpenCLKernelAttr>())
3076 return true;
3077 return getLexicalDeclContext()->isExternCContext();
3078 }
3079
isInExternCXXContext() const3080 bool FunctionDecl::isInExternCXXContext() const {
3081 return getLexicalDeclContext()->isExternCXXContext();
3082 }
3083
isGlobal() const3084 bool FunctionDecl::isGlobal() const {
3085 if (const auto *Method = dyn_cast<CXXMethodDecl>(this))
3086 return Method->isStatic();
3087
3088 if (getCanonicalDecl()->getStorageClass() == SC_Static)
3089 return false;
3090
3091 for (const DeclContext *DC = getDeclContext();
3092 DC->isNamespace();
3093 DC = DC->getParent()) {
3094 if (const auto *Namespace = cast<NamespaceDecl>(DC)) {
3095 if (!Namespace->getDeclName())
3096 return false;
3097 break;
3098 }
3099 }
3100
3101 return true;
3102 }
3103
isNoReturn() const3104 bool FunctionDecl::isNoReturn() const {
3105 if (hasAttr<NoReturnAttr>() || hasAttr<CXX11NoReturnAttr>() ||
3106 hasAttr<C11NoReturnAttr>())
3107 return true;
3108
3109 if (auto *FnTy = getType()->getAs<FunctionType>())
3110 return FnTy->getNoReturnAttr();
3111
3112 return false;
3113 }
3114
3115
getMultiVersionKind() const3116 MultiVersionKind FunctionDecl::getMultiVersionKind() const {
3117 if (hasAttr<TargetAttr>())
3118 return MultiVersionKind::Target;
3119 if (hasAttr<CPUDispatchAttr>())
3120 return MultiVersionKind::CPUDispatch;
3121 if (hasAttr<CPUSpecificAttr>())
3122 return MultiVersionKind::CPUSpecific;
3123 return MultiVersionKind::None;
3124 }
3125
isCPUDispatchMultiVersion() const3126 bool FunctionDecl::isCPUDispatchMultiVersion() const {
3127 return isMultiVersion() && hasAttr<CPUDispatchAttr>();
3128 }
3129
isCPUSpecificMultiVersion() const3130 bool FunctionDecl::isCPUSpecificMultiVersion() const {
3131 return isMultiVersion() && hasAttr<CPUSpecificAttr>();
3132 }
3133
isTargetMultiVersion() const3134 bool FunctionDecl::isTargetMultiVersion() const {
3135 return isMultiVersion() && hasAttr<TargetAttr>();
3136 }
3137
3138 void
setPreviousDeclaration(FunctionDecl * PrevDecl)3139 FunctionDecl::setPreviousDeclaration(FunctionDecl *PrevDecl) {
3140 redeclarable_base::setPreviousDecl(PrevDecl);
3141
3142 if (FunctionTemplateDecl *FunTmpl = getDescribedFunctionTemplate()) {
3143 FunctionTemplateDecl *PrevFunTmpl
3144 = PrevDecl? PrevDecl->getDescribedFunctionTemplate() : nullptr;
3145 assert((!PrevDecl || PrevFunTmpl) && "Function/function template mismatch");
3146 FunTmpl->setPreviousDecl(PrevFunTmpl);
3147 }
3148
3149 if (PrevDecl && PrevDecl->isInlined())
3150 setImplicitlyInline(true);
3151 }
3152
getCanonicalDecl()3153 FunctionDecl *FunctionDecl::getCanonicalDecl() { return getFirstDecl(); }
3154
3155 /// Returns a value indicating whether this function corresponds to a builtin
3156 /// function.
3157 ///
3158 /// The function corresponds to a built-in function if it is declared at
3159 /// translation scope or within an extern "C" block and its name matches with
3160 /// the name of a builtin. The returned value will be 0 for functions that do
3161 /// not correspond to a builtin, a value of type \c Builtin::ID if in the
3162 /// target-independent range \c [1,Builtin::First), or a target-specific builtin
3163 /// value.
3164 ///
3165 /// \param ConsiderWrapperFunctions If true, we should consider wrapper
3166 /// functions as their wrapped builtins. This shouldn't be done in general, but
3167 /// it's useful in Sema to diagnose calls to wrappers based on their semantics.
getBuiltinID(bool ConsiderWrapperFunctions) const3168 unsigned FunctionDecl::getBuiltinID(bool ConsiderWrapperFunctions) const {
3169 unsigned BuiltinID;
3170
3171 if (const auto *ABAA = getAttr<ArmBuiltinAliasAttr>()) {
3172 BuiltinID = ABAA->getBuiltinName()->getBuiltinID();
3173 } else {
3174 if (!getIdentifier())
3175 return 0;
3176
3177 BuiltinID = getIdentifier()->getBuiltinID();
3178 }
3179
3180 if (!BuiltinID)
3181 return 0;
3182
3183 ASTContext &Context = getASTContext();
3184 if (Context.getLangOpts().CPlusPlus) {
3185 const auto *LinkageDecl =
3186 dyn_cast<LinkageSpecDecl>(getFirstDecl()->getDeclContext());
3187 // In C++, the first declaration of a builtin is always inside an implicit
3188 // extern "C".
3189 // FIXME: A recognised library function may not be directly in an extern "C"
3190 // declaration, for instance "extern "C" { namespace std { decl } }".
3191 if (!LinkageDecl) {
3192 if (BuiltinID == Builtin::BI__GetExceptionInfo &&
3193 Context.getTargetInfo().getCXXABI().isMicrosoft())
3194 return Builtin::BI__GetExceptionInfo;
3195 return 0;
3196 }
3197 if (LinkageDecl->getLanguage() != LinkageSpecDecl::lang_c)
3198 return 0;
3199 }
3200
3201 // If the function is marked "overloadable", it has a different mangled name
3202 // and is not the C library function.
3203 if (!ConsiderWrapperFunctions && hasAttr<OverloadableAttr>() &&
3204 !hasAttr<ArmBuiltinAliasAttr>())
3205 return 0;
3206
3207 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))
3208 return BuiltinID;
3209
3210 // This function has the name of a known C library
3211 // function. Determine whether it actually refers to the C library
3212 // function or whether it just has the same name.
3213
3214 // If this is a static function, it's not a builtin.
3215 if (!ConsiderWrapperFunctions && getStorageClass() == SC_Static)
3216 return 0;
3217
3218 // OpenCL v1.2 s6.9.f - The library functions defined in
3219 // the C99 standard headers are not available.
3220 if (Context.getLangOpts().OpenCL &&
3221 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID))
3222 return 0;
3223
3224 // CUDA does not have device-side standard library. printf and malloc are the
3225 // only special cases that are supported by device-side runtime.
3226 if (Context.getLangOpts().CUDA && hasAttr<CUDADeviceAttr>() &&
3227 !hasAttr<CUDAHostAttr>() &&
3228 !(BuiltinID == Builtin::BIprintf || BuiltinID == Builtin::BImalloc))
3229 return 0;
3230
3231 // As AMDGCN implementation of OpenMP does not have a device-side standard
3232 // library, none of the predefined library functions except printf and malloc
3233 // should be treated as a builtin i.e. 0 should be returned for them.
3234 if (Context.getTargetInfo().getTriple().isAMDGCN() &&
3235 Context.getLangOpts().OpenMPIsDevice &&
3236 Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID) &&
3237 !(BuiltinID == Builtin::BIprintf || BuiltinID == Builtin::BImalloc))
3238 return 0;
3239
3240 return BuiltinID;
3241 }
3242
3243 /// getNumParams - Return the number of parameters this function must have
3244 /// based on its FunctionType. This is the length of the ParamInfo array
3245 /// after it has been created.
getNumParams() const3246 unsigned FunctionDecl::getNumParams() const {
3247 const auto *FPT = getType()->getAs<FunctionProtoType>();
3248 return FPT ? FPT->getNumParams() : 0;
3249 }
3250
setParams(ASTContext & C,ArrayRef<ParmVarDecl * > NewParamInfo)3251 void FunctionDecl::setParams(ASTContext &C,
3252 ArrayRef<ParmVarDecl *> NewParamInfo) {
3253 assert(!ParamInfo && "Already has param info!");
3254 assert(NewParamInfo.size() == getNumParams() && "Parameter count mismatch!");
3255
3256 // Zero params -> null pointer.
3257 if (!NewParamInfo.empty()) {
3258 ParamInfo = new (C) ParmVarDecl*[NewParamInfo.size()];
3259 std::copy(NewParamInfo.begin(), NewParamInfo.end(), ParamInfo);
3260 }
3261 }
3262
3263 /// getMinRequiredArguments - Returns the minimum number of arguments
3264 /// needed to call this function. This may be fewer than the number of
3265 /// function parameters, if some of the parameters have default
3266 /// arguments (in C++) or are parameter packs (C++11).
getMinRequiredArguments() const3267 unsigned FunctionDecl::getMinRequiredArguments() const {
3268 if (!getASTContext().getLangOpts().CPlusPlus)
3269 return getNumParams();
3270
3271 // Note that it is possible for a parameter with no default argument to
3272 // follow a parameter with a default argument.
3273 unsigned NumRequiredArgs = 0;
3274 unsigned MinParamsSoFar = 0;
3275 for (auto *Param : parameters()) {
3276 if (!Param->isParameterPack()) {
3277 ++MinParamsSoFar;
3278 if (!Param->hasDefaultArg())
3279 NumRequiredArgs = MinParamsSoFar;
3280 }
3281 }
3282 return NumRequiredArgs;
3283 }
3284
hasOneParamOrDefaultArgs() const3285 bool FunctionDecl::hasOneParamOrDefaultArgs() const {
3286 return getNumParams() == 1 ||
3287 (getNumParams() > 1 &&
3288 std::all_of(param_begin() + 1, param_end(),
3289 [](ParmVarDecl *P) { return P->hasDefaultArg(); }));
3290 }
3291
3292 /// The combination of the extern and inline keywords under MSVC forces
3293 /// the function to be required.
3294 ///
3295 /// Note: This function assumes that we will only get called when isInlined()
3296 /// would return true for this FunctionDecl.
isMSExternInline() const3297 bool FunctionDecl::isMSExternInline() const {
3298 assert(isInlined() && "expected to get called on an inlined function!");
3299
3300 const ASTContext &Context = getASTContext();
3301 if (!Context.getTargetInfo().getCXXABI().isMicrosoft() &&
3302 !hasAttr<DLLExportAttr>())
3303 return false;
3304
3305 for (const FunctionDecl *FD = getMostRecentDecl(); FD;
3306 FD = FD->getPreviousDecl())
3307 if (!FD->isImplicit() && FD->getStorageClass() == SC_Extern)
3308 return true;
3309
3310 return false;
3311 }
3312
redeclForcesDefMSVC(const FunctionDecl * Redecl)3313 static bool redeclForcesDefMSVC(const FunctionDecl *Redecl) {
3314 if (Redecl->getStorageClass() != SC_Extern)
3315 return false;
3316
3317 for (const FunctionDecl *FD = Redecl->getPreviousDecl(); FD;
3318 FD = FD->getPreviousDecl())
3319 if (!FD->isImplicit() && FD->getStorageClass() == SC_Extern)
3320 return false;
3321
3322 return true;
3323 }
3324
RedeclForcesDefC99(const FunctionDecl * Redecl)3325 static bool RedeclForcesDefC99(const FunctionDecl *Redecl) {
3326 // Only consider file-scope declarations in this test.
3327 if (!Redecl->getLexicalDeclContext()->isTranslationUnit())
3328 return false;
3329
3330 // Only consider explicit declarations; the presence of a builtin for a
3331 // libcall shouldn't affect whether a definition is externally visible.
3332 if (Redecl->isImplicit())
3333 return false;
3334
3335 if (!Redecl->isInlineSpecified() || Redecl->getStorageClass() == SC_Extern)
3336 return true; // Not an inline definition
3337
3338 return false;
3339 }
3340
3341 /// For a function declaration in C or C++, determine whether this
3342 /// declaration causes the definition to be externally visible.
3343 ///
3344 /// For instance, this determines if adding the current declaration to the set
3345 /// of redeclarations of the given functions causes
3346 /// isInlineDefinitionExternallyVisible to change from false to true.
doesDeclarationForceExternallyVisibleDefinition() const3347 bool FunctionDecl::doesDeclarationForceExternallyVisibleDefinition() const {
3348 assert(!doesThisDeclarationHaveABody() &&
3349 "Must have a declaration without a body.");
3350
3351 ASTContext &Context = getASTContext();
3352
3353 if (Context.getLangOpts().MSVCCompat) {
3354 const FunctionDecl *Definition;
3355 if (hasBody(Definition) && Definition->isInlined() &&
3356 redeclForcesDefMSVC(this))
3357 return true;
3358 }
3359
3360 if (Context.getLangOpts().CPlusPlus)
3361 return false;
3362
3363 if (Context.getLangOpts().GNUInline || hasAttr<GNUInlineAttr>()) {
3364 // With GNU inlining, a declaration with 'inline' but not 'extern', forces
3365 // an externally visible definition.
3366 //
3367 // FIXME: What happens if gnu_inline gets added on after the first
3368 // declaration?
3369 if (!isInlineSpecified() || getStorageClass() == SC_Extern)
3370 return false;
3371
3372 const FunctionDecl *Prev = this;
3373 bool FoundBody = false;
3374 while ((Prev = Prev->getPreviousDecl())) {
3375 FoundBody |= Prev->doesThisDeclarationHaveABody();
3376
3377 if (Prev->doesThisDeclarationHaveABody()) {
3378 // If it's not the case that both 'inline' and 'extern' are
3379 // specified on the definition, then it is always externally visible.
3380 if (!Prev->isInlineSpecified() ||
3381 Prev->getStorageClass() != SC_Extern)
3382 return false;
3383 } else if (Prev->isInlineSpecified() &&
3384 Prev->getStorageClass() != SC_Extern) {
3385 return false;
3386 }
3387 }
3388 return FoundBody;
3389 }
3390
3391 // C99 6.7.4p6:
3392 // [...] If all of the file scope declarations for a function in a
3393 // translation unit include the inline function specifier without extern,
3394 // then the definition in that translation unit is an inline definition.
3395 if (isInlineSpecified() && getStorageClass() != SC_Extern)
3396 return false;
3397 const FunctionDecl *Prev = this;
3398 bool FoundBody = false;
3399 while ((Prev = Prev->getPreviousDecl())) {
3400 FoundBody |= Prev->doesThisDeclarationHaveABody();
3401 if (RedeclForcesDefC99(Prev))
3402 return false;
3403 }
3404 return FoundBody;
3405 }
3406
getFunctionTypeLoc() const3407 FunctionTypeLoc FunctionDecl::getFunctionTypeLoc() const {
3408 const TypeSourceInfo *TSI = getTypeSourceInfo();
3409 return TSI ? TSI->getTypeLoc().IgnoreParens().getAs<FunctionTypeLoc>()
3410 : FunctionTypeLoc();
3411 }
3412
getReturnTypeSourceRange() const3413 SourceRange FunctionDecl::getReturnTypeSourceRange() const {
3414 FunctionTypeLoc FTL = getFunctionTypeLoc();
3415 if (!FTL)
3416 return SourceRange();
3417
3418 // Skip self-referential return types.
3419 const SourceManager &SM = getASTContext().getSourceManager();
3420 SourceRange RTRange = FTL.getReturnLoc().getSourceRange();
3421 SourceLocation Boundary = getNameInfo().getBeginLoc();
3422 if (RTRange.isInvalid() || Boundary.isInvalid() ||
3423 !SM.isBeforeInTranslationUnit(RTRange.getEnd(), Boundary))
3424 return SourceRange();
3425
3426 return RTRange;
3427 }
3428
getParametersSourceRange() const3429 SourceRange FunctionDecl::getParametersSourceRange() const {
3430 unsigned NP = getNumParams();
3431 SourceLocation EllipsisLoc = getEllipsisLoc();
3432
3433 if (NP == 0 && EllipsisLoc.isInvalid())
3434 return SourceRange();
3435
3436 SourceLocation Begin =
3437 NP > 0 ? ParamInfo[0]->getSourceRange().getBegin() : EllipsisLoc;
3438 SourceLocation End = EllipsisLoc.isValid()
3439 ? EllipsisLoc
3440 : ParamInfo[NP - 1]->getSourceRange().getEnd();
3441
3442 return SourceRange(Begin, End);
3443 }
3444
getExceptionSpecSourceRange() const3445 SourceRange FunctionDecl::getExceptionSpecSourceRange() const {
3446 FunctionTypeLoc FTL = getFunctionTypeLoc();
3447 return FTL ? FTL.getExceptionSpecRange() : SourceRange();
3448 }
3449
3450 /// For an inline function definition in C, or for a gnu_inline function
3451 /// in C++, determine whether the definition will be externally visible.
3452 ///
3453 /// Inline function definitions are always available for inlining optimizations.
3454 /// However, depending on the language dialect, declaration specifiers, and
3455 /// attributes, the definition of an inline function may or may not be
3456 /// "externally" visible to other translation units in the program.
3457 ///
3458 /// In C99, inline definitions are not externally visible by default. However,
3459 /// if even one of the global-scope declarations is marked "extern inline", the
3460 /// inline definition becomes externally visible (C99 6.7.4p6).
3461 ///
3462 /// In GNU89 mode, or if the gnu_inline attribute is attached to the function
3463 /// definition, we use the GNU semantics for inline, which are nearly the
3464 /// opposite of C99 semantics. In particular, "inline" by itself will create
3465 /// an externally visible symbol, but "extern inline" will not create an
3466 /// externally visible symbol.
isInlineDefinitionExternallyVisible() const3467 bool FunctionDecl::isInlineDefinitionExternallyVisible() const {
3468 assert((doesThisDeclarationHaveABody() || willHaveBody() ||
3469 hasAttr<AliasAttr>()) &&
3470 "Must be a function definition");
3471 assert(isInlined() && "Function must be inline");
3472 ASTContext &Context = getASTContext();
3473
3474 if (Context.getLangOpts().GNUInline || hasAttr<GNUInlineAttr>()) {
3475 // Note: If you change the logic here, please change
3476 // doesDeclarationForceExternallyVisibleDefinition as well.
3477 //
3478 // If it's not the case that both 'inline' and 'extern' are
3479 // specified on the definition, then this inline definition is
3480 // externally visible.
3481 if (Context.getLangOpts().CPlusPlus)
3482 return false;
3483 if (!(isInlineSpecified() && getStorageClass() == SC_Extern))
3484 return true;
3485
3486 // If any declaration is 'inline' but not 'extern', then this definition
3487 // is externally visible.
3488 for (auto Redecl : redecls()) {
3489 if (Redecl->isInlineSpecified() &&
3490 Redecl->getStorageClass() != SC_Extern)
3491 return true;
3492 }
3493
3494 return false;
3495 }
3496
3497 // The rest of this function is C-only.
3498 assert(!Context.getLangOpts().CPlusPlus &&
3499 "should not use C inline rules in C++");
3500
3501 // C99 6.7.4p6:
3502 // [...] If all of the file scope declarations for a function in a
3503 // translation unit include the inline function specifier without extern,
3504 // then the definition in that translation unit is an inline definition.
3505 for (auto Redecl : redecls()) {
3506 if (RedeclForcesDefC99(Redecl))
3507 return true;
3508 }
3509
3510 // C99 6.7.4p6:
3511 // An inline definition does not provide an external definition for the
3512 // function, and does not forbid an external definition in another
3513 // translation unit.
3514 return false;
3515 }
3516
3517 /// getOverloadedOperator - Which C++ overloaded operator this
3518 /// function represents, if any.
getOverloadedOperator() const3519 OverloadedOperatorKind FunctionDecl::getOverloadedOperator() const {
3520 if (getDeclName().getNameKind() == DeclarationName::CXXOperatorName)
3521 return getDeclName().getCXXOverloadedOperator();
3522 else
3523 return OO_None;
3524 }
3525
3526 /// getLiteralIdentifier - The literal suffix identifier this function
3527 /// represents, if any.
getLiteralIdentifier() const3528 const IdentifierInfo *FunctionDecl::getLiteralIdentifier() const {
3529 if (getDeclName().getNameKind() == DeclarationName::CXXLiteralOperatorName)
3530 return getDeclName().getCXXLiteralIdentifier();
3531 else
3532 return nullptr;
3533 }
3534
getTemplatedKind() const3535 FunctionDecl::TemplatedKind FunctionDecl::getTemplatedKind() const {
3536 if (TemplateOrSpecialization.isNull())
3537 return TK_NonTemplate;
3538 if (TemplateOrSpecialization.is<FunctionTemplateDecl *>())
3539 return TK_FunctionTemplate;
3540 if (TemplateOrSpecialization.is<MemberSpecializationInfo *>())
3541 return TK_MemberSpecialization;
3542 if (TemplateOrSpecialization.is<FunctionTemplateSpecializationInfo *>())
3543 return TK_FunctionTemplateSpecialization;
3544 if (TemplateOrSpecialization.is
3545 <DependentFunctionTemplateSpecializationInfo*>())
3546 return TK_DependentFunctionTemplateSpecialization;
3547
3548 llvm_unreachable("Did we miss a TemplateOrSpecialization type?");
3549 }
3550
getInstantiatedFromMemberFunction() const3551 FunctionDecl *FunctionDecl::getInstantiatedFromMemberFunction() const {
3552 if (MemberSpecializationInfo *Info = getMemberSpecializationInfo())
3553 return cast<FunctionDecl>(Info->getInstantiatedFrom());
3554
3555 return nullptr;
3556 }
3557
getMemberSpecializationInfo() const3558 MemberSpecializationInfo *FunctionDecl::getMemberSpecializationInfo() const {
3559 if (auto *MSI =
3560 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
3561 return MSI;
3562 if (auto *FTSI = TemplateOrSpecialization
3563 .dyn_cast<FunctionTemplateSpecializationInfo *>())
3564 return FTSI->getMemberSpecializationInfo();
3565 return nullptr;
3566 }
3567
3568 void
setInstantiationOfMemberFunction(ASTContext & C,FunctionDecl * FD,TemplateSpecializationKind TSK)3569 FunctionDecl::setInstantiationOfMemberFunction(ASTContext &C,
3570 FunctionDecl *FD,
3571 TemplateSpecializationKind TSK) {
3572 assert(TemplateOrSpecialization.isNull() &&
3573 "Member function is already a specialization");
3574 MemberSpecializationInfo *Info
3575 = new (C) MemberSpecializationInfo(FD, TSK);
3576 TemplateOrSpecialization = Info;
3577 }
3578
getDescribedFunctionTemplate() const3579 FunctionTemplateDecl *FunctionDecl::getDescribedFunctionTemplate() const {
3580 return TemplateOrSpecialization.dyn_cast<FunctionTemplateDecl *>();
3581 }
3582
setDescribedFunctionTemplate(FunctionTemplateDecl * Template)3583 void FunctionDecl::setDescribedFunctionTemplate(FunctionTemplateDecl *Template) {
3584 assert(TemplateOrSpecialization.isNull() &&
3585 "Member function is already a specialization");
3586 TemplateOrSpecialization = Template;
3587 }
3588
isImplicitlyInstantiable() const3589 bool FunctionDecl::isImplicitlyInstantiable() const {
3590 // If the function is invalid, it can't be implicitly instantiated.
3591 if (isInvalidDecl())
3592 return false;
3593
3594 switch (getTemplateSpecializationKindForInstantiation()) {
3595 case TSK_Undeclared:
3596 case TSK_ExplicitInstantiationDefinition:
3597 case TSK_ExplicitSpecialization:
3598 return false;
3599
3600 case TSK_ImplicitInstantiation:
3601 return true;
3602
3603 case TSK_ExplicitInstantiationDeclaration:
3604 // Handled below.
3605 break;
3606 }
3607
3608 // Find the actual template from which we will instantiate.
3609 const FunctionDecl *PatternDecl = getTemplateInstantiationPattern();
3610 bool HasPattern = false;
3611 if (PatternDecl)
3612 HasPattern = PatternDecl->hasBody(PatternDecl);
3613
3614 // C++0x [temp.explicit]p9:
3615 // Except for inline functions, other explicit instantiation declarations
3616 // have the effect of suppressing the implicit instantiation of the entity
3617 // to which they refer.
3618 if (!HasPattern || !PatternDecl)
3619 return true;
3620
3621 return PatternDecl->isInlined();
3622 }
3623
isTemplateInstantiation() const3624 bool FunctionDecl::isTemplateInstantiation() const {
3625 // FIXME: Remove this, it's not clear what it means. (Which template
3626 // specialization kind?)
3627 return clang::isTemplateInstantiation(getTemplateSpecializationKind());
3628 }
3629
3630 FunctionDecl *
getTemplateInstantiationPattern(bool ForDefinition) const3631 FunctionDecl::getTemplateInstantiationPattern(bool ForDefinition) const {
3632 // If this is a generic lambda call operator specialization, its
3633 // instantiation pattern is always its primary template's pattern
3634 // even if its primary template was instantiated from another
3635 // member template (which happens with nested generic lambdas).
3636 // Since a lambda's call operator's body is transformed eagerly,
3637 // we don't have to go hunting for a prototype definition template
3638 // (i.e. instantiated-from-member-template) to use as an instantiation
3639 // pattern.
3640
3641 if (isGenericLambdaCallOperatorSpecialization(
3642 dyn_cast<CXXMethodDecl>(this))) {
3643 assert(getPrimaryTemplate() && "not a generic lambda call operator?");
3644 return getDefinitionOrSelf(getPrimaryTemplate()->getTemplatedDecl());
3645 }
3646
3647 if (MemberSpecializationInfo *Info = getMemberSpecializationInfo()) {
3648 if (ForDefinition &&
3649 !clang::isTemplateInstantiation(Info->getTemplateSpecializationKind()))
3650 return nullptr;
3651 return getDefinitionOrSelf(cast<FunctionDecl>(Info->getInstantiatedFrom()));
3652 }
3653
3654 if (ForDefinition &&
3655 !clang::isTemplateInstantiation(getTemplateSpecializationKind()))
3656 return nullptr;
3657
3658 if (FunctionTemplateDecl *Primary = getPrimaryTemplate()) {
3659 // If we hit a point where the user provided a specialization of this
3660 // template, we're done looking.
3661 while (!ForDefinition || !Primary->isMemberSpecialization()) {
3662 auto *NewPrimary = Primary->getInstantiatedFromMemberTemplate();
3663 if (!NewPrimary)
3664 break;
3665 Primary = NewPrimary;
3666 }
3667
3668 return getDefinitionOrSelf(Primary->getTemplatedDecl());
3669 }
3670
3671 return nullptr;
3672 }
3673
getPrimaryTemplate() const3674 FunctionTemplateDecl *FunctionDecl::getPrimaryTemplate() const {
3675 if (FunctionTemplateSpecializationInfo *Info
3676 = TemplateOrSpecialization
3677 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3678 return Info->getTemplate();
3679 }
3680 return nullptr;
3681 }
3682
3683 FunctionTemplateSpecializationInfo *
getTemplateSpecializationInfo() const3684 FunctionDecl::getTemplateSpecializationInfo() const {
3685 return TemplateOrSpecialization
3686 .dyn_cast<FunctionTemplateSpecializationInfo *>();
3687 }
3688
3689 const TemplateArgumentList *
getTemplateSpecializationArgs() const3690 FunctionDecl::getTemplateSpecializationArgs() const {
3691 if (FunctionTemplateSpecializationInfo *Info
3692 = TemplateOrSpecialization
3693 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3694 return Info->TemplateArguments;
3695 }
3696 return nullptr;
3697 }
3698
3699 const ASTTemplateArgumentListInfo *
getTemplateSpecializationArgsAsWritten() const3700 FunctionDecl::getTemplateSpecializationArgsAsWritten() const {
3701 if (FunctionTemplateSpecializationInfo *Info
3702 = TemplateOrSpecialization
3703 .dyn_cast<FunctionTemplateSpecializationInfo*>()) {
3704 return Info->TemplateArgumentsAsWritten;
3705 }
3706 return nullptr;
3707 }
3708
3709 void
setFunctionTemplateSpecialization(ASTContext & C,FunctionTemplateDecl * Template,const TemplateArgumentList * TemplateArgs,void * InsertPos,TemplateSpecializationKind TSK,const TemplateArgumentListInfo * TemplateArgsAsWritten,SourceLocation PointOfInstantiation)3710 FunctionDecl::setFunctionTemplateSpecialization(ASTContext &C,
3711 FunctionTemplateDecl *Template,
3712 const TemplateArgumentList *TemplateArgs,
3713 void *InsertPos,
3714 TemplateSpecializationKind TSK,
3715 const TemplateArgumentListInfo *TemplateArgsAsWritten,
3716 SourceLocation PointOfInstantiation) {
3717 assert((TemplateOrSpecialization.isNull() ||
3718 TemplateOrSpecialization.is<MemberSpecializationInfo *>()) &&
3719 "Member function is already a specialization");
3720 assert(TSK != TSK_Undeclared &&
3721 "Must specify the type of function template specialization");
3722 assert((TemplateOrSpecialization.isNull() ||
3723 TSK == TSK_ExplicitSpecialization) &&
3724 "Member specialization must be an explicit specialization");
3725 FunctionTemplateSpecializationInfo *Info =
3726 FunctionTemplateSpecializationInfo::Create(
3727 C, this, Template, TSK, TemplateArgs, TemplateArgsAsWritten,
3728 PointOfInstantiation,
3729 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>());
3730 TemplateOrSpecialization = Info;
3731 Template->addSpecialization(Info, InsertPos);
3732 }
3733
3734 void
setDependentTemplateSpecialization(ASTContext & Context,const UnresolvedSetImpl & Templates,const TemplateArgumentListInfo & TemplateArgs)3735 FunctionDecl::setDependentTemplateSpecialization(ASTContext &Context,
3736 const UnresolvedSetImpl &Templates,
3737 const TemplateArgumentListInfo &TemplateArgs) {
3738 assert(TemplateOrSpecialization.isNull());
3739 DependentFunctionTemplateSpecializationInfo *Info =
3740 DependentFunctionTemplateSpecializationInfo::Create(Context, Templates,
3741 TemplateArgs);
3742 TemplateOrSpecialization = Info;
3743 }
3744
3745 DependentFunctionTemplateSpecializationInfo *
getDependentSpecializationInfo() const3746 FunctionDecl::getDependentSpecializationInfo() const {
3747 return TemplateOrSpecialization
3748 .dyn_cast<DependentFunctionTemplateSpecializationInfo *>();
3749 }
3750
3751 DependentFunctionTemplateSpecializationInfo *
Create(ASTContext & Context,const UnresolvedSetImpl & Ts,const TemplateArgumentListInfo & TArgs)3752 DependentFunctionTemplateSpecializationInfo::Create(
3753 ASTContext &Context, const UnresolvedSetImpl &Ts,
3754 const TemplateArgumentListInfo &TArgs) {
3755 void *Buffer = Context.Allocate(
3756 totalSizeToAlloc<TemplateArgumentLoc, FunctionTemplateDecl *>(
3757 TArgs.size(), Ts.size()));
3758 return new (Buffer) DependentFunctionTemplateSpecializationInfo(Ts, TArgs);
3759 }
3760
3761 DependentFunctionTemplateSpecializationInfo::
DependentFunctionTemplateSpecializationInfo(const UnresolvedSetImpl & Ts,const TemplateArgumentListInfo & TArgs)3762 DependentFunctionTemplateSpecializationInfo(const UnresolvedSetImpl &Ts,
3763 const TemplateArgumentListInfo &TArgs)
3764 : AngleLocs(TArgs.getLAngleLoc(), TArgs.getRAngleLoc()) {
3765 NumTemplates = Ts.size();
3766 NumArgs = TArgs.size();
3767
3768 FunctionTemplateDecl **TsArray = getTrailingObjects<FunctionTemplateDecl *>();
3769 for (unsigned I = 0, E = Ts.size(); I != E; ++I)
3770 TsArray[I] = cast<FunctionTemplateDecl>(Ts[I]->getUnderlyingDecl());
3771
3772 TemplateArgumentLoc *ArgsArray = getTrailingObjects<TemplateArgumentLoc>();
3773 for (unsigned I = 0, E = TArgs.size(); I != E; ++I)
3774 new (&ArgsArray[I]) TemplateArgumentLoc(TArgs[I]);
3775 }
3776
getTemplateSpecializationKind() const3777 TemplateSpecializationKind FunctionDecl::getTemplateSpecializationKind() const {
3778 // For a function template specialization, query the specialization
3779 // information object.
3780 if (FunctionTemplateSpecializationInfo *FTSInfo =
3781 TemplateOrSpecialization
3782 .dyn_cast<FunctionTemplateSpecializationInfo *>())
3783 return FTSInfo->getTemplateSpecializationKind();
3784
3785 if (MemberSpecializationInfo *MSInfo =
3786 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
3787 return MSInfo->getTemplateSpecializationKind();
3788
3789 return TSK_Undeclared;
3790 }
3791
3792 TemplateSpecializationKind
getTemplateSpecializationKindForInstantiation() const3793 FunctionDecl::getTemplateSpecializationKindForInstantiation() const {
3794 // This is the same as getTemplateSpecializationKind(), except that for a
3795 // function that is both a function template specialization and a member
3796 // specialization, we prefer the member specialization information. Eg:
3797 //
3798 // template<typename T> struct A {
3799 // template<typename U> void f() {}
3800 // template<> void f<int>() {}
3801 // };
3802 //
3803 // For A<int>::f<int>():
3804 // * getTemplateSpecializationKind() will return TSK_ExplicitSpecialization
3805 // * getTemplateSpecializationKindForInstantiation() will return
3806 // TSK_ImplicitInstantiation
3807 //
3808 // This reflects the facts that A<int>::f<int> is an explicit specialization
3809 // of A<int>::f, and that A<int>::f<int> should be implicitly instantiated
3810 // from A::f<int> if a definition is needed.
3811 if (FunctionTemplateSpecializationInfo *FTSInfo =
3812 TemplateOrSpecialization
3813 .dyn_cast<FunctionTemplateSpecializationInfo *>()) {
3814 if (auto *MSInfo = FTSInfo->getMemberSpecializationInfo())
3815 return MSInfo->getTemplateSpecializationKind();
3816 return FTSInfo->getTemplateSpecializationKind();
3817 }
3818
3819 if (MemberSpecializationInfo *MSInfo =
3820 TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo *>())
3821 return MSInfo->getTemplateSpecializationKind();
3822
3823 return TSK_Undeclared;
3824 }
3825
3826 void
setTemplateSpecializationKind(TemplateSpecializationKind TSK,SourceLocation PointOfInstantiation)3827 FunctionDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
3828 SourceLocation PointOfInstantiation) {
3829 if (FunctionTemplateSpecializationInfo *FTSInfo
3830 = TemplateOrSpecialization.dyn_cast<
3831 FunctionTemplateSpecializationInfo*>()) {
3832 FTSInfo->setTemplateSpecializationKind(TSK);
3833 if (TSK != TSK_ExplicitSpecialization &&
3834 PointOfInstantiation.isValid() &&
3835 FTSInfo->getPointOfInstantiation().isInvalid()) {
3836 FTSInfo->setPointOfInstantiation(PointOfInstantiation);
3837 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
3838 L->InstantiationRequested(this);
3839 }
3840 } else if (MemberSpecializationInfo *MSInfo
3841 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>()) {
3842 MSInfo->setTemplateSpecializationKind(TSK);
3843 if (TSK != TSK_ExplicitSpecialization &&
3844 PointOfInstantiation.isValid() &&
3845 MSInfo->getPointOfInstantiation().isInvalid()) {
3846 MSInfo->setPointOfInstantiation(PointOfInstantiation);
3847 if (ASTMutationListener *L = getASTContext().getASTMutationListener())
3848 L->InstantiationRequested(this);
3849 }
3850 } else
3851 llvm_unreachable("Function cannot have a template specialization kind");
3852 }
3853
getPointOfInstantiation() const3854 SourceLocation FunctionDecl::getPointOfInstantiation() const {
3855 if (FunctionTemplateSpecializationInfo *FTSInfo
3856 = TemplateOrSpecialization.dyn_cast<
3857 FunctionTemplateSpecializationInfo*>())
3858 return FTSInfo->getPointOfInstantiation();
3859 else if (MemberSpecializationInfo *MSInfo
3860 = TemplateOrSpecialization.dyn_cast<MemberSpecializationInfo*>())
3861 return MSInfo->getPointOfInstantiation();
3862
3863 return SourceLocation();
3864 }
3865
isOutOfLine() const3866 bool FunctionDecl::isOutOfLine() const {
3867 if (Decl::isOutOfLine())
3868 return true;
3869
3870 // If this function was instantiated from a member function of a
3871 // class template, check whether that member function was defined out-of-line.
3872 if (FunctionDecl *FD = getInstantiatedFromMemberFunction()) {
3873 const FunctionDecl *Definition;
3874 if (FD->hasBody(Definition))
3875 return Definition->isOutOfLine();
3876 }
3877
3878 // If this function was instantiated from a function template,
3879 // check whether that function template was defined out-of-line.
3880 if (FunctionTemplateDecl *FunTmpl = getPrimaryTemplate()) {
3881 const FunctionDecl *Definition;
3882 if (FunTmpl->getTemplatedDecl()->hasBody(Definition))
3883 return Definition->isOutOfLine();
3884 }
3885
3886 return false;
3887 }
3888
getSourceRange() const3889 SourceRange FunctionDecl::getSourceRange() const {
3890 return SourceRange(getOuterLocStart(), EndRangeLoc);
3891 }
3892
getMemoryFunctionKind() const3893 unsigned FunctionDecl::getMemoryFunctionKind() const {
3894 IdentifierInfo *FnInfo = getIdentifier();
3895
3896 if (!FnInfo)
3897 return 0;
3898
3899 // Builtin handling.
3900 switch (getBuiltinID()) {
3901 case Builtin::BI__builtin_memset:
3902 case Builtin::BI__builtin___memset_chk:
3903 case Builtin::BImemset:
3904 return Builtin::BImemset;
3905
3906 case Builtin::BI__builtin_memcpy:
3907 case Builtin::BI__builtin___memcpy_chk:
3908 case Builtin::BImemcpy:
3909 return Builtin::BImemcpy;
3910
3911 case Builtin::BI__builtin_mempcpy:
3912 case Builtin::BI__builtin___mempcpy_chk:
3913 case Builtin::BImempcpy:
3914 return Builtin::BImempcpy;
3915
3916 case Builtin::BI__builtin_memmove:
3917 case Builtin::BI__builtin___memmove_chk:
3918 case Builtin::BImemmove:
3919 return Builtin::BImemmove;
3920
3921 case Builtin::BIstrlcpy:
3922 case Builtin::BI__builtin___strlcpy_chk:
3923 return Builtin::BIstrlcpy;
3924
3925 case Builtin::BIstrlcat:
3926 case Builtin::BI__builtin___strlcat_chk:
3927 return Builtin::BIstrlcat;
3928
3929 case Builtin::BI__builtin_memcmp:
3930 case Builtin::BImemcmp:
3931 return Builtin::BImemcmp;
3932
3933 case Builtin::BI__builtin_bcmp:
3934 case Builtin::BIbcmp:
3935 return Builtin::BIbcmp;
3936
3937 case Builtin::BI__builtin_strncpy:
3938 case Builtin::BI__builtin___strncpy_chk:
3939 case Builtin::BIstrncpy:
3940 return Builtin::BIstrncpy;
3941
3942 case Builtin::BI__builtin_strncmp:
3943 case Builtin::BIstrncmp:
3944 return Builtin::BIstrncmp;
3945
3946 case Builtin::BI__builtin_strncasecmp:
3947 case Builtin::BIstrncasecmp:
3948 return Builtin::BIstrncasecmp;
3949
3950 case Builtin::BI__builtin_strncat:
3951 case Builtin::BI__builtin___strncat_chk:
3952 case Builtin::BIstrncat:
3953 return Builtin::BIstrncat;
3954
3955 case Builtin::BI__builtin_strndup:
3956 case Builtin::BIstrndup:
3957 return Builtin::BIstrndup;
3958
3959 case Builtin::BI__builtin_strlen:
3960 case Builtin::BIstrlen:
3961 return Builtin::BIstrlen;
3962
3963 case Builtin::BI__builtin_bzero:
3964 case Builtin::BIbzero:
3965 return Builtin::BIbzero;
3966
3967 default:
3968 if (isExternC()) {
3969 if (FnInfo->isStr("memset"))
3970 return Builtin::BImemset;
3971 else if (FnInfo->isStr("memcpy"))
3972 return Builtin::BImemcpy;
3973 else if (FnInfo->isStr("mempcpy"))
3974 return Builtin::BImempcpy;
3975 else if (FnInfo->isStr("memmove"))
3976 return Builtin::BImemmove;
3977 else if (FnInfo->isStr("memcmp"))
3978 return Builtin::BImemcmp;
3979 else if (FnInfo->isStr("bcmp"))
3980 return Builtin::BIbcmp;
3981 else if (FnInfo->isStr("strncpy"))
3982 return Builtin::BIstrncpy;
3983 else if (FnInfo->isStr("strncmp"))
3984 return Builtin::BIstrncmp;
3985 else if (FnInfo->isStr("strncasecmp"))
3986 return Builtin::BIstrncasecmp;
3987 else if (FnInfo->isStr("strncat"))
3988 return Builtin::BIstrncat;
3989 else if (FnInfo->isStr("strndup"))
3990 return Builtin::BIstrndup;
3991 else if (FnInfo->isStr("strlen"))
3992 return Builtin::BIstrlen;
3993 else if (FnInfo->isStr("bzero"))
3994 return Builtin::BIbzero;
3995 }
3996 break;
3997 }
3998 return 0;
3999 }
4000
getODRHash() const4001 unsigned FunctionDecl::getODRHash() const {
4002 assert(hasODRHash());
4003 return ODRHash;
4004 }
4005
getODRHash()4006 unsigned FunctionDecl::getODRHash() {
4007 if (hasODRHash())
4008 return ODRHash;
4009
4010 if (auto *FT = getInstantiatedFromMemberFunction()) {
4011 setHasODRHash(true);
4012 ODRHash = FT->getODRHash();
4013 return ODRHash;
4014 }
4015
4016 class ODRHash Hash;
4017 Hash.AddFunctionDecl(this);
4018 setHasODRHash(true);
4019 ODRHash = Hash.CalculateHash();
4020 return ODRHash;
4021 }
4022
4023 //===----------------------------------------------------------------------===//
4024 // FieldDecl Implementation
4025 //===----------------------------------------------------------------------===//
4026
Create(const ASTContext & C,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,IdentifierInfo * Id,QualType T,TypeSourceInfo * TInfo,Expr * BW,bool Mutable,InClassInitStyle InitStyle)4027 FieldDecl *FieldDecl::Create(const ASTContext &C, DeclContext *DC,
4028 SourceLocation StartLoc, SourceLocation IdLoc,
4029 IdentifierInfo *Id, QualType T,
4030 TypeSourceInfo *TInfo, Expr *BW, bool Mutable,
4031 InClassInitStyle InitStyle) {
4032 return new (C, DC) FieldDecl(Decl::Field, DC, StartLoc, IdLoc, Id, T, TInfo,
4033 BW, Mutable, InitStyle);
4034 }
4035
CreateDeserialized(ASTContext & C,unsigned ID)4036 FieldDecl *FieldDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4037 return new (C, ID) FieldDecl(Field, nullptr, SourceLocation(),
4038 SourceLocation(), nullptr, QualType(), nullptr,
4039 nullptr, false, ICIS_NoInit);
4040 }
4041
isAnonymousStructOrUnion() const4042 bool FieldDecl::isAnonymousStructOrUnion() const {
4043 if (!isImplicit() || getDeclName())
4044 return false;
4045
4046 if (const auto *Record = getType()->getAs<RecordType>())
4047 return Record->getDecl()->isAnonymousStructOrUnion();
4048
4049 return false;
4050 }
4051
getBitWidthValue(const ASTContext & Ctx) const4052 unsigned FieldDecl::getBitWidthValue(const ASTContext &Ctx) const {
4053 assert(isBitField() && "not a bitfield");
4054 return getBitWidth()->EvaluateKnownConstInt(Ctx).getZExtValue();
4055 }
4056
isZeroLengthBitField(const ASTContext & Ctx) const4057 bool FieldDecl::isZeroLengthBitField(const ASTContext &Ctx) const {
4058 return isUnnamedBitfield() && !getBitWidth()->isValueDependent() &&
4059 getBitWidthValue(Ctx) == 0;
4060 }
4061
isZeroSize(const ASTContext & Ctx) const4062 bool FieldDecl::isZeroSize(const ASTContext &Ctx) const {
4063 if (isZeroLengthBitField(Ctx))
4064 return true;
4065
4066 // C++2a [intro.object]p7:
4067 // An object has nonzero size if it
4068 // -- is not a potentially-overlapping subobject, or
4069 if (!hasAttr<NoUniqueAddressAttr>())
4070 return false;
4071
4072 // -- is not of class type, or
4073 const auto *RT = getType()->getAs<RecordType>();
4074 if (!RT)
4075 return false;
4076 const RecordDecl *RD = RT->getDecl()->getDefinition();
4077 if (!RD) {
4078 assert(isInvalidDecl() && "valid field has incomplete type");
4079 return false;
4080 }
4081
4082 // -- [has] virtual member functions or virtual base classes, or
4083 // -- has subobjects of nonzero size or bit-fields of nonzero length
4084 const auto *CXXRD = cast<CXXRecordDecl>(RD);
4085 if (!CXXRD->isEmpty())
4086 return false;
4087
4088 // Otherwise, [...] the circumstances under which the object has zero size
4089 // are implementation-defined.
4090 // FIXME: This might be Itanium ABI specific; we don't yet know what the MS
4091 // ABI will do.
4092 return true;
4093 }
4094
getFieldIndex() const4095 unsigned FieldDecl::getFieldIndex() const {
4096 const FieldDecl *Canonical = getCanonicalDecl();
4097 if (Canonical != this)
4098 return Canonical->getFieldIndex();
4099
4100 if (CachedFieldIndex) return CachedFieldIndex - 1;
4101
4102 unsigned Index = 0;
4103 const RecordDecl *RD = getParent()->getDefinition();
4104 assert(RD && "requested index for field of struct with no definition");
4105
4106 for (auto *Field : RD->fields()) {
4107 Field->getCanonicalDecl()->CachedFieldIndex = Index + 1;
4108 ++Index;
4109 }
4110
4111 assert(CachedFieldIndex && "failed to find field in parent");
4112 return CachedFieldIndex - 1;
4113 }
4114
getSourceRange() const4115 SourceRange FieldDecl::getSourceRange() const {
4116 const Expr *FinalExpr = getInClassInitializer();
4117 if (!FinalExpr)
4118 FinalExpr = getBitWidth();
4119 if (FinalExpr)
4120 return SourceRange(getInnerLocStart(), FinalExpr->getEndLoc());
4121 return DeclaratorDecl::getSourceRange();
4122 }
4123
setCapturedVLAType(const VariableArrayType * VLAType)4124 void FieldDecl::setCapturedVLAType(const VariableArrayType *VLAType) {
4125 assert((getParent()->isLambda() || getParent()->isCapturedRecord()) &&
4126 "capturing type in non-lambda or captured record.");
4127 assert(InitStorage.getInt() == ISK_NoInit &&
4128 InitStorage.getPointer() == nullptr &&
4129 "bit width, initializer or captured type already set");
4130 InitStorage.setPointerAndInt(const_cast<VariableArrayType *>(VLAType),
4131 ISK_CapturedVLAType);
4132 }
4133
4134 //===----------------------------------------------------------------------===//
4135 // TagDecl Implementation
4136 //===----------------------------------------------------------------------===//
4137
TagDecl(Kind DK,TagKind TK,const ASTContext & C,DeclContext * DC,SourceLocation L,IdentifierInfo * Id,TagDecl * PrevDecl,SourceLocation StartL)4138 TagDecl::TagDecl(Kind DK, TagKind TK, const ASTContext &C, DeclContext *DC,
4139 SourceLocation L, IdentifierInfo *Id, TagDecl *PrevDecl,
4140 SourceLocation StartL)
4141 : TypeDecl(DK, DC, L, Id, StartL), DeclContext(DK), redeclarable_base(C),
4142 TypedefNameDeclOrQualifier((TypedefNameDecl *)nullptr) {
4143 assert((DK != Enum || TK == TTK_Enum) &&
4144 "EnumDecl not matched with TTK_Enum");
4145 setPreviousDecl(PrevDecl);
4146 setTagKind(TK);
4147 setCompleteDefinition(false);
4148 setBeingDefined(false);
4149 setEmbeddedInDeclarator(false);
4150 setFreeStanding(false);
4151 setCompleteDefinitionRequired(false);
4152 }
4153
getOuterLocStart() const4154 SourceLocation TagDecl::getOuterLocStart() const {
4155 return getTemplateOrInnerLocStart(this);
4156 }
4157
getSourceRange() const4158 SourceRange TagDecl::getSourceRange() const {
4159 SourceLocation RBraceLoc = BraceRange.getEnd();
4160 SourceLocation E = RBraceLoc.isValid() ? RBraceLoc : getLocation();
4161 return SourceRange(getOuterLocStart(), E);
4162 }
4163
getCanonicalDecl()4164 TagDecl *TagDecl::getCanonicalDecl() { return getFirstDecl(); }
4165
setTypedefNameForAnonDecl(TypedefNameDecl * TDD)4166 void TagDecl::setTypedefNameForAnonDecl(TypedefNameDecl *TDD) {
4167 TypedefNameDeclOrQualifier = TDD;
4168 if (const Type *T = getTypeForDecl()) {
4169 (void)T;
4170 assert(T->isLinkageValid());
4171 }
4172 assert(isLinkageValid());
4173 }
4174
startDefinition()4175 void TagDecl::startDefinition() {
4176 setBeingDefined(true);
4177
4178 if (auto *D = dyn_cast<CXXRecordDecl>(this)) {
4179 struct CXXRecordDecl::DefinitionData *Data =
4180 new (getASTContext()) struct CXXRecordDecl::DefinitionData(D);
4181 for (auto I : redecls())
4182 cast<CXXRecordDecl>(I)->DefinitionData = Data;
4183 }
4184 }
4185
completeDefinition()4186 void TagDecl::completeDefinition() {
4187 assert((!isa<CXXRecordDecl>(this) ||
4188 cast<CXXRecordDecl>(this)->hasDefinition()) &&
4189 "definition completed but not started");
4190
4191 setCompleteDefinition(true);
4192 setBeingDefined(false);
4193
4194 if (ASTMutationListener *L = getASTMutationListener())
4195 L->CompletedTagDefinition(this);
4196 }
4197
getDefinition() const4198 TagDecl *TagDecl::getDefinition() const {
4199 if (isCompleteDefinition())
4200 return const_cast<TagDecl *>(this);
4201
4202 // If it's possible for us to have an out-of-date definition, check now.
4203 if (mayHaveOutOfDateDef()) {
4204 if (IdentifierInfo *II = getIdentifier()) {
4205 if (II->isOutOfDate()) {
4206 updateOutOfDate(*II);
4207 }
4208 }
4209 }
4210
4211 if (const auto *CXXRD = dyn_cast<CXXRecordDecl>(this))
4212 return CXXRD->getDefinition();
4213
4214 for (auto R : redecls())
4215 if (R->isCompleteDefinition())
4216 return R;
4217
4218 return nullptr;
4219 }
4220
setQualifierInfo(NestedNameSpecifierLoc QualifierLoc)4221 void TagDecl::setQualifierInfo(NestedNameSpecifierLoc QualifierLoc) {
4222 if (QualifierLoc) {
4223 // Make sure the extended qualifier info is allocated.
4224 if (!hasExtInfo())
4225 TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo;
4226 // Set qualifier info.
4227 getExtInfo()->QualifierLoc = QualifierLoc;
4228 } else {
4229 // Here Qualifier == 0, i.e., we are removing the qualifier (if any).
4230 if (hasExtInfo()) {
4231 if (getExtInfo()->NumTemplParamLists == 0) {
4232 getASTContext().Deallocate(getExtInfo());
4233 TypedefNameDeclOrQualifier = (TypedefNameDecl *)nullptr;
4234 }
4235 else
4236 getExtInfo()->QualifierLoc = QualifierLoc;
4237 }
4238 }
4239 }
4240
setTemplateParameterListsInfo(ASTContext & Context,ArrayRef<TemplateParameterList * > TPLists)4241 void TagDecl::setTemplateParameterListsInfo(
4242 ASTContext &Context, ArrayRef<TemplateParameterList *> TPLists) {
4243 assert(!TPLists.empty());
4244 // Make sure the extended decl info is allocated.
4245 if (!hasExtInfo())
4246 // Allocate external info struct.
4247 TypedefNameDeclOrQualifier = new (getASTContext()) ExtInfo;
4248 // Set the template parameter lists info.
4249 getExtInfo()->setTemplateParameterListsInfo(Context, TPLists);
4250 }
4251
4252 //===----------------------------------------------------------------------===//
4253 // EnumDecl Implementation
4254 //===----------------------------------------------------------------------===//
4255
EnumDecl(ASTContext & C,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,IdentifierInfo * Id,EnumDecl * PrevDecl,bool Scoped,bool ScopedUsingClassTag,bool Fixed)4256 EnumDecl::EnumDecl(ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
4257 SourceLocation IdLoc, IdentifierInfo *Id, EnumDecl *PrevDecl,
4258 bool Scoped, bool ScopedUsingClassTag, bool Fixed)
4259 : TagDecl(Enum, TTK_Enum, C, DC, IdLoc, Id, PrevDecl, StartLoc) {
4260 assert(Scoped || !ScopedUsingClassTag);
4261 IntegerType = nullptr;
4262 setNumPositiveBits(0);
4263 setNumNegativeBits(0);
4264 setScoped(Scoped);
4265 setScopedUsingClassTag(ScopedUsingClassTag);
4266 setFixed(Fixed);
4267 setHasODRHash(false);
4268 ODRHash = 0;
4269 }
4270
anchor()4271 void EnumDecl::anchor() {}
4272
Create(ASTContext & C,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,IdentifierInfo * Id,EnumDecl * PrevDecl,bool IsScoped,bool IsScopedUsingClassTag,bool IsFixed)4273 EnumDecl *EnumDecl::Create(ASTContext &C, DeclContext *DC,
4274 SourceLocation StartLoc, SourceLocation IdLoc,
4275 IdentifierInfo *Id,
4276 EnumDecl *PrevDecl, bool IsScoped,
4277 bool IsScopedUsingClassTag, bool IsFixed) {
4278 auto *Enum = new (C, DC) EnumDecl(C, DC, StartLoc, IdLoc, Id, PrevDecl,
4279 IsScoped, IsScopedUsingClassTag, IsFixed);
4280 Enum->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4281 C.getTypeDeclType(Enum, PrevDecl);
4282 return Enum;
4283 }
4284
CreateDeserialized(ASTContext & C,unsigned ID)4285 EnumDecl *EnumDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4286 EnumDecl *Enum =
4287 new (C, ID) EnumDecl(C, nullptr, SourceLocation(), SourceLocation(),
4288 nullptr, nullptr, false, false, false);
4289 Enum->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4290 return Enum;
4291 }
4292
getIntegerTypeRange() const4293 SourceRange EnumDecl::getIntegerTypeRange() const {
4294 if (const TypeSourceInfo *TI = getIntegerTypeSourceInfo())
4295 return TI->getTypeLoc().getSourceRange();
4296 return SourceRange();
4297 }
4298
completeDefinition(QualType NewType,QualType NewPromotionType,unsigned NumPositiveBits,unsigned NumNegativeBits)4299 void EnumDecl::completeDefinition(QualType NewType,
4300 QualType NewPromotionType,
4301 unsigned NumPositiveBits,
4302 unsigned NumNegativeBits) {
4303 assert(!isCompleteDefinition() && "Cannot redefine enums!");
4304 if (!IntegerType)
4305 IntegerType = NewType.getTypePtr();
4306 PromotionType = NewPromotionType;
4307 setNumPositiveBits(NumPositiveBits);
4308 setNumNegativeBits(NumNegativeBits);
4309 TagDecl::completeDefinition();
4310 }
4311
isClosed() const4312 bool EnumDecl::isClosed() const {
4313 if (const auto *A = getAttr<EnumExtensibilityAttr>())
4314 return A->getExtensibility() == EnumExtensibilityAttr::Closed;
4315 return true;
4316 }
4317
isClosedFlag() const4318 bool EnumDecl::isClosedFlag() const {
4319 return isClosed() && hasAttr<FlagEnumAttr>();
4320 }
4321
isClosedNonFlag() const4322 bool EnumDecl::isClosedNonFlag() const {
4323 return isClosed() && !hasAttr<FlagEnumAttr>();
4324 }
4325
getTemplateSpecializationKind() const4326 TemplateSpecializationKind EnumDecl::getTemplateSpecializationKind() const {
4327 if (MemberSpecializationInfo *MSI = getMemberSpecializationInfo())
4328 return MSI->getTemplateSpecializationKind();
4329
4330 return TSK_Undeclared;
4331 }
4332
setTemplateSpecializationKind(TemplateSpecializationKind TSK,SourceLocation PointOfInstantiation)4333 void EnumDecl::setTemplateSpecializationKind(TemplateSpecializationKind TSK,
4334 SourceLocation PointOfInstantiation) {
4335 MemberSpecializationInfo *MSI = getMemberSpecializationInfo();
4336 assert(MSI && "Not an instantiated member enumeration?");
4337 MSI->setTemplateSpecializationKind(TSK);
4338 if (TSK != TSK_ExplicitSpecialization &&
4339 PointOfInstantiation.isValid() &&
4340 MSI->getPointOfInstantiation().isInvalid())
4341 MSI->setPointOfInstantiation(PointOfInstantiation);
4342 }
4343
getTemplateInstantiationPattern() const4344 EnumDecl *EnumDecl::getTemplateInstantiationPattern() const {
4345 if (MemberSpecializationInfo *MSInfo = getMemberSpecializationInfo()) {
4346 if (isTemplateInstantiation(MSInfo->getTemplateSpecializationKind())) {
4347 EnumDecl *ED = getInstantiatedFromMemberEnum();
4348 while (auto *NewED = ED->getInstantiatedFromMemberEnum())
4349 ED = NewED;
4350 return getDefinitionOrSelf(ED);
4351 }
4352 }
4353
4354 assert(!isTemplateInstantiation(getTemplateSpecializationKind()) &&
4355 "couldn't find pattern for enum instantiation");
4356 return nullptr;
4357 }
4358
getInstantiatedFromMemberEnum() const4359 EnumDecl *EnumDecl::getInstantiatedFromMemberEnum() const {
4360 if (SpecializationInfo)
4361 return cast<EnumDecl>(SpecializationInfo->getInstantiatedFrom());
4362
4363 return nullptr;
4364 }
4365
setInstantiationOfMemberEnum(ASTContext & C,EnumDecl * ED,TemplateSpecializationKind TSK)4366 void EnumDecl::setInstantiationOfMemberEnum(ASTContext &C, EnumDecl *ED,
4367 TemplateSpecializationKind TSK) {
4368 assert(!SpecializationInfo && "Member enum is already a specialization");
4369 SpecializationInfo = new (C) MemberSpecializationInfo(ED, TSK);
4370 }
4371
getODRHash()4372 unsigned EnumDecl::getODRHash() {
4373 if (hasODRHash())
4374 return ODRHash;
4375
4376 class ODRHash Hash;
4377 Hash.AddEnumDecl(this);
4378 setHasODRHash(true);
4379 ODRHash = Hash.CalculateHash();
4380 return ODRHash;
4381 }
4382
4383 //===----------------------------------------------------------------------===//
4384 // RecordDecl Implementation
4385 //===----------------------------------------------------------------------===//
4386
RecordDecl(Kind DK,TagKind TK,const ASTContext & C,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,IdentifierInfo * Id,RecordDecl * PrevDecl)4387 RecordDecl::RecordDecl(Kind DK, TagKind TK, const ASTContext &C,
4388 DeclContext *DC, SourceLocation StartLoc,
4389 SourceLocation IdLoc, IdentifierInfo *Id,
4390 RecordDecl *PrevDecl)
4391 : TagDecl(DK, TK, C, DC, IdLoc, Id, PrevDecl, StartLoc) {
4392 assert(classof(static_cast<Decl *>(this)) && "Invalid Kind!");
4393 setHasFlexibleArrayMember(false);
4394 setAnonymousStructOrUnion(false);
4395 setHasObjectMember(false);
4396 setHasVolatileMember(false);
4397 setHasLoadedFieldsFromExternalStorage(false);
4398 setNonTrivialToPrimitiveDefaultInitialize(false);
4399 setNonTrivialToPrimitiveCopy(false);
4400 setNonTrivialToPrimitiveDestroy(false);
4401 setHasNonTrivialToPrimitiveDefaultInitializeCUnion(false);
4402 setHasNonTrivialToPrimitiveDestructCUnion(false);
4403 setHasNonTrivialToPrimitiveCopyCUnion(false);
4404 setParamDestroyedInCallee(false);
4405 setArgPassingRestrictions(APK_CanPassInRegs);
4406 }
4407
Create(const ASTContext & C,TagKind TK,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,IdentifierInfo * Id,RecordDecl * PrevDecl)4408 RecordDecl *RecordDecl::Create(const ASTContext &C, TagKind TK, DeclContext *DC,
4409 SourceLocation StartLoc, SourceLocation IdLoc,
4410 IdentifierInfo *Id, RecordDecl* PrevDecl) {
4411 RecordDecl *R = new (C, DC) RecordDecl(Record, TK, C, DC,
4412 StartLoc, IdLoc, Id, PrevDecl);
4413 R->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4414
4415 C.getTypeDeclType(R, PrevDecl);
4416 return R;
4417 }
4418
CreateDeserialized(const ASTContext & C,unsigned ID)4419 RecordDecl *RecordDecl::CreateDeserialized(const ASTContext &C, unsigned ID) {
4420 RecordDecl *R =
4421 new (C, ID) RecordDecl(Record, TTK_Struct, C, nullptr, SourceLocation(),
4422 SourceLocation(), nullptr, nullptr);
4423 R->setMayHaveOutOfDateDef(C.getLangOpts().Modules);
4424 return R;
4425 }
4426
isInjectedClassName() const4427 bool RecordDecl::isInjectedClassName() const {
4428 return isImplicit() && getDeclName() && getDeclContext()->isRecord() &&
4429 cast<RecordDecl>(getDeclContext())->getDeclName() == getDeclName();
4430 }
4431
isLambda() const4432 bool RecordDecl::isLambda() const {
4433 if (auto RD = dyn_cast<CXXRecordDecl>(this))
4434 return RD->isLambda();
4435 return false;
4436 }
4437
isCapturedRecord() const4438 bool RecordDecl::isCapturedRecord() const {
4439 return hasAttr<CapturedRecordAttr>();
4440 }
4441
setCapturedRecord()4442 void RecordDecl::setCapturedRecord() {
4443 addAttr(CapturedRecordAttr::CreateImplicit(getASTContext()));
4444 }
4445
isOrContainsUnion() const4446 bool RecordDecl::isOrContainsUnion() const {
4447 if (isUnion())
4448 return true;
4449
4450 if (const RecordDecl *Def = getDefinition()) {
4451 for (const FieldDecl *FD : Def->fields()) {
4452 const RecordType *RT = FD->getType()->getAs<RecordType>();
4453 if (RT && RT->getDecl()->isOrContainsUnion())
4454 return true;
4455 }
4456 }
4457
4458 return false;
4459 }
4460
field_begin() const4461 RecordDecl::field_iterator RecordDecl::field_begin() const {
4462 if (hasExternalLexicalStorage() && !hasLoadedFieldsFromExternalStorage())
4463 LoadFieldsFromExternalStorage();
4464
4465 return field_iterator(decl_iterator(FirstDecl));
4466 }
4467
4468 /// completeDefinition - Notes that the definition of this type is now
4469 /// complete.
completeDefinition()4470 void RecordDecl::completeDefinition() {
4471 assert(!isCompleteDefinition() && "Cannot redefine record!");
4472 TagDecl::completeDefinition();
4473 }
4474
4475 /// isMsStruct - Get whether or not this record uses ms_struct layout.
4476 /// This which can be turned on with an attribute, pragma, or the
4477 /// -mms-bitfields command-line option.
isMsStruct(const ASTContext & C) const4478 bool RecordDecl::isMsStruct(const ASTContext &C) const {
4479 return hasAttr<MSStructAttr>() || C.getLangOpts().MSBitfields == 1;
4480 }
4481
LoadFieldsFromExternalStorage() const4482 void RecordDecl::LoadFieldsFromExternalStorage() const {
4483 ExternalASTSource *Source = getASTContext().getExternalSource();
4484 assert(hasExternalLexicalStorage() && Source && "No external storage?");
4485
4486 // Notify that we have a RecordDecl doing some initialization.
4487 ExternalASTSource::Deserializing TheFields(Source);
4488
4489 SmallVector<Decl*, 64> Decls;
4490 setHasLoadedFieldsFromExternalStorage(true);
4491 Source->FindExternalLexicalDecls(this, [](Decl::Kind K) {
4492 return FieldDecl::classofKind(K) || IndirectFieldDecl::classofKind(K);
4493 }, Decls);
4494
4495 #ifndef NDEBUG
4496 // Check that all decls we got were FieldDecls.
4497 for (unsigned i=0, e=Decls.size(); i != e; ++i)
4498 assert(isa<FieldDecl>(Decls[i]) || isa<IndirectFieldDecl>(Decls[i]));
4499 #endif
4500
4501 if (Decls.empty())
4502 return;
4503
4504 std::tie(FirstDecl, LastDecl) = BuildDeclChain(Decls,
4505 /*FieldsAlreadyLoaded=*/false);
4506 }
4507
mayInsertExtraPadding(bool EmitRemark) const4508 bool RecordDecl::mayInsertExtraPadding(bool EmitRemark) const {
4509 ASTContext &Context = getASTContext();
4510 const SanitizerMask EnabledAsanMask = Context.getLangOpts().Sanitize.Mask &
4511 (SanitizerKind::Address | SanitizerKind::KernelAddress);
4512 if (!EnabledAsanMask || !Context.getLangOpts().SanitizeAddressFieldPadding)
4513 return false;
4514 const auto &Blacklist = Context.getSanitizerBlacklist();
4515 const auto *CXXRD = dyn_cast<CXXRecordDecl>(this);
4516 // We may be able to relax some of these requirements.
4517 int ReasonToReject = -1;
4518 if (!CXXRD || CXXRD->isExternCContext())
4519 ReasonToReject = 0; // is not C++.
4520 else if (CXXRD->hasAttr<PackedAttr>())
4521 ReasonToReject = 1; // is packed.
4522 else if (CXXRD->isUnion())
4523 ReasonToReject = 2; // is a union.
4524 else if (CXXRD->isTriviallyCopyable())
4525 ReasonToReject = 3; // is trivially copyable.
4526 else if (CXXRD->hasTrivialDestructor())
4527 ReasonToReject = 4; // has trivial destructor.
4528 else if (CXXRD->isStandardLayout())
4529 ReasonToReject = 5; // is standard layout.
4530 else if (Blacklist.isBlacklistedLocation(EnabledAsanMask, getLocation(),
4531 "field-padding"))
4532 ReasonToReject = 6; // is in an excluded file.
4533 else if (Blacklist.isBlacklistedType(EnabledAsanMask,
4534 getQualifiedNameAsString(),
4535 "field-padding"))
4536 ReasonToReject = 7; // The type is excluded.
4537
4538 if (EmitRemark) {
4539 if (ReasonToReject >= 0)
4540 Context.getDiagnostics().Report(
4541 getLocation(),
4542 diag::remark_sanitize_address_insert_extra_padding_rejected)
4543 << getQualifiedNameAsString() << ReasonToReject;
4544 else
4545 Context.getDiagnostics().Report(
4546 getLocation(),
4547 diag::remark_sanitize_address_insert_extra_padding_accepted)
4548 << getQualifiedNameAsString();
4549 }
4550 return ReasonToReject < 0;
4551 }
4552
findFirstNamedDataMember() const4553 const FieldDecl *RecordDecl::findFirstNamedDataMember() const {
4554 for (const auto *I : fields()) {
4555 if (I->getIdentifier())
4556 return I;
4557
4558 if (const auto *RT = I->getType()->getAs<RecordType>())
4559 if (const FieldDecl *NamedDataMember =
4560 RT->getDecl()->findFirstNamedDataMember())
4561 return NamedDataMember;
4562 }
4563
4564 // We didn't find a named data member.
4565 return nullptr;
4566 }
4567
4568 //===----------------------------------------------------------------------===//
4569 // BlockDecl Implementation
4570 //===----------------------------------------------------------------------===//
4571
BlockDecl(DeclContext * DC,SourceLocation CaretLoc)4572 BlockDecl::BlockDecl(DeclContext *DC, SourceLocation CaretLoc)
4573 : Decl(Block, DC, CaretLoc), DeclContext(Block) {
4574 setIsVariadic(false);
4575 setCapturesCXXThis(false);
4576 setBlockMissingReturnType(true);
4577 setIsConversionFromLambda(false);
4578 setDoesNotEscape(false);
4579 setCanAvoidCopyToHeap(false);
4580 }
4581
setParams(ArrayRef<ParmVarDecl * > NewParamInfo)4582 void BlockDecl::setParams(ArrayRef<ParmVarDecl *> NewParamInfo) {
4583 assert(!ParamInfo && "Already has param info!");
4584
4585 // Zero params -> null pointer.
4586 if (!NewParamInfo.empty()) {
4587 NumParams = NewParamInfo.size();
4588 ParamInfo = new (getASTContext()) ParmVarDecl*[NewParamInfo.size()];
4589 std::copy(NewParamInfo.begin(), NewParamInfo.end(), ParamInfo);
4590 }
4591 }
4592
setCaptures(ASTContext & Context,ArrayRef<Capture> Captures,bool CapturesCXXThis)4593 void BlockDecl::setCaptures(ASTContext &Context, ArrayRef<Capture> Captures,
4594 bool CapturesCXXThis) {
4595 this->setCapturesCXXThis(CapturesCXXThis);
4596 this->NumCaptures = Captures.size();
4597
4598 if (Captures.empty()) {
4599 this->Captures = nullptr;
4600 return;
4601 }
4602
4603 this->Captures = Captures.copy(Context).data();
4604 }
4605
capturesVariable(const VarDecl * variable) const4606 bool BlockDecl::capturesVariable(const VarDecl *variable) const {
4607 for (const auto &I : captures())
4608 // Only auto vars can be captured, so no redeclaration worries.
4609 if (I.getVariable() == variable)
4610 return true;
4611
4612 return false;
4613 }
4614
getSourceRange() const4615 SourceRange BlockDecl::getSourceRange() const {
4616 return SourceRange(getLocation(), Body ? Body->getEndLoc() : getLocation());
4617 }
4618
4619 //===----------------------------------------------------------------------===//
4620 // Other Decl Allocation/Deallocation Method Implementations
4621 //===----------------------------------------------------------------------===//
4622
anchor()4623 void TranslationUnitDecl::anchor() {}
4624
Create(ASTContext & C)4625 TranslationUnitDecl *TranslationUnitDecl::Create(ASTContext &C) {
4626 return new (C, (DeclContext *)nullptr) TranslationUnitDecl(C);
4627 }
4628
anchor()4629 void PragmaCommentDecl::anchor() {}
4630
Create(const ASTContext & C,TranslationUnitDecl * DC,SourceLocation CommentLoc,PragmaMSCommentKind CommentKind,StringRef Arg)4631 PragmaCommentDecl *PragmaCommentDecl::Create(const ASTContext &C,
4632 TranslationUnitDecl *DC,
4633 SourceLocation CommentLoc,
4634 PragmaMSCommentKind CommentKind,
4635 StringRef Arg) {
4636 PragmaCommentDecl *PCD =
4637 new (C, DC, additionalSizeToAlloc<char>(Arg.size() + 1))
4638 PragmaCommentDecl(DC, CommentLoc, CommentKind);
4639 memcpy(PCD->getTrailingObjects<char>(), Arg.data(), Arg.size());
4640 PCD->getTrailingObjects<char>()[Arg.size()] = '\0';
4641 return PCD;
4642 }
4643
CreateDeserialized(ASTContext & C,unsigned ID,unsigned ArgSize)4644 PragmaCommentDecl *PragmaCommentDecl::CreateDeserialized(ASTContext &C,
4645 unsigned ID,
4646 unsigned ArgSize) {
4647 return new (C, ID, additionalSizeToAlloc<char>(ArgSize + 1))
4648 PragmaCommentDecl(nullptr, SourceLocation(), PCK_Unknown);
4649 }
4650
anchor()4651 void PragmaDetectMismatchDecl::anchor() {}
4652
4653 PragmaDetectMismatchDecl *
Create(const ASTContext & C,TranslationUnitDecl * DC,SourceLocation Loc,StringRef Name,StringRef Value)4654 PragmaDetectMismatchDecl::Create(const ASTContext &C, TranslationUnitDecl *DC,
4655 SourceLocation Loc, StringRef Name,
4656 StringRef Value) {
4657 size_t ValueStart = Name.size() + 1;
4658 PragmaDetectMismatchDecl *PDMD =
4659 new (C, DC, additionalSizeToAlloc<char>(ValueStart + Value.size() + 1))
4660 PragmaDetectMismatchDecl(DC, Loc, ValueStart);
4661 memcpy(PDMD->getTrailingObjects<char>(), Name.data(), Name.size());
4662 PDMD->getTrailingObjects<char>()[Name.size()] = '\0';
4663 memcpy(PDMD->getTrailingObjects<char>() + ValueStart, Value.data(),
4664 Value.size());
4665 PDMD->getTrailingObjects<char>()[ValueStart + Value.size()] = '\0';
4666 return PDMD;
4667 }
4668
4669 PragmaDetectMismatchDecl *
CreateDeserialized(ASTContext & C,unsigned ID,unsigned NameValueSize)4670 PragmaDetectMismatchDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4671 unsigned NameValueSize) {
4672 return new (C, ID, additionalSizeToAlloc<char>(NameValueSize + 1))
4673 PragmaDetectMismatchDecl(nullptr, SourceLocation(), 0);
4674 }
4675
anchor()4676 void ExternCContextDecl::anchor() {}
4677
Create(const ASTContext & C,TranslationUnitDecl * DC)4678 ExternCContextDecl *ExternCContextDecl::Create(const ASTContext &C,
4679 TranslationUnitDecl *DC) {
4680 return new (C, DC) ExternCContextDecl(DC);
4681 }
4682
anchor()4683 void LabelDecl::anchor() {}
4684
Create(ASTContext & C,DeclContext * DC,SourceLocation IdentL,IdentifierInfo * II)4685 LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC,
4686 SourceLocation IdentL, IdentifierInfo *II) {
4687 return new (C, DC) LabelDecl(DC, IdentL, II, nullptr, IdentL);
4688 }
4689
Create(ASTContext & C,DeclContext * DC,SourceLocation IdentL,IdentifierInfo * II,SourceLocation GnuLabelL)4690 LabelDecl *LabelDecl::Create(ASTContext &C, DeclContext *DC,
4691 SourceLocation IdentL, IdentifierInfo *II,
4692 SourceLocation GnuLabelL) {
4693 assert(GnuLabelL != IdentL && "Use this only for GNU local labels");
4694 return new (C, DC) LabelDecl(DC, IdentL, II, nullptr, GnuLabelL);
4695 }
4696
CreateDeserialized(ASTContext & C,unsigned ID)4697 LabelDecl *LabelDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4698 return new (C, ID) LabelDecl(nullptr, SourceLocation(), nullptr, nullptr,
4699 SourceLocation());
4700 }
4701
setMSAsmLabel(StringRef Name)4702 void LabelDecl::setMSAsmLabel(StringRef Name) {
4703 char *Buffer = new (getASTContext(), 1) char[Name.size() + 1];
4704 memcpy(Buffer, Name.data(), Name.size());
4705 Buffer[Name.size()] = '\0';
4706 MSAsmName = Buffer;
4707 }
4708
anchor()4709 void ValueDecl::anchor() {}
4710
isWeak() const4711 bool ValueDecl::isWeak() const {
4712 for (const auto *I : attrs())
4713 if (isa<WeakAttr>(I) || isa<WeakRefAttr>(I))
4714 return true;
4715
4716 return isWeakImported();
4717 }
4718
anchor()4719 void ImplicitParamDecl::anchor() {}
4720
Create(ASTContext & C,DeclContext * DC,SourceLocation IdLoc,IdentifierInfo * Id,QualType Type,ImplicitParamKind ParamKind)4721 ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, DeclContext *DC,
4722 SourceLocation IdLoc,
4723 IdentifierInfo *Id, QualType Type,
4724 ImplicitParamKind ParamKind) {
4725 return new (C, DC) ImplicitParamDecl(C, DC, IdLoc, Id, Type, ParamKind);
4726 }
4727
Create(ASTContext & C,QualType Type,ImplicitParamKind ParamKind)4728 ImplicitParamDecl *ImplicitParamDecl::Create(ASTContext &C, QualType Type,
4729 ImplicitParamKind ParamKind) {
4730 return new (C, nullptr) ImplicitParamDecl(C, Type, ParamKind);
4731 }
4732
CreateDeserialized(ASTContext & C,unsigned ID)4733 ImplicitParamDecl *ImplicitParamDecl::CreateDeserialized(ASTContext &C,
4734 unsigned ID) {
4735 return new (C, ID) ImplicitParamDecl(C, QualType(), ImplicitParamKind::Other);
4736 }
4737
Create(ASTContext & C,DeclContext * DC,SourceLocation StartLoc,const DeclarationNameInfo & NameInfo,QualType T,TypeSourceInfo * TInfo,StorageClass SC,bool isInlineSpecified,bool hasWrittenPrototype,ConstexprSpecKind ConstexprKind,Expr * TrailingRequiresClause)4738 FunctionDecl *FunctionDecl::Create(ASTContext &C, DeclContext *DC,
4739 SourceLocation StartLoc,
4740 const DeclarationNameInfo &NameInfo,
4741 QualType T, TypeSourceInfo *TInfo,
4742 StorageClass SC, bool isInlineSpecified,
4743 bool hasWrittenPrototype,
4744 ConstexprSpecKind ConstexprKind,
4745 Expr *TrailingRequiresClause) {
4746 FunctionDecl *New =
4747 new (C, DC) FunctionDecl(Function, C, DC, StartLoc, NameInfo, T, TInfo,
4748 SC, isInlineSpecified, ConstexprKind,
4749 TrailingRequiresClause);
4750 New->setHasWrittenPrototype(hasWrittenPrototype);
4751 return New;
4752 }
4753
CreateDeserialized(ASTContext & C,unsigned ID)4754 FunctionDecl *FunctionDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4755 return new (C, ID) FunctionDecl(Function, C, nullptr, SourceLocation(),
4756 DeclarationNameInfo(), QualType(), nullptr,
4757 SC_None, false, CSK_unspecified, nullptr);
4758 }
4759
Create(ASTContext & C,DeclContext * DC,SourceLocation L)4760 BlockDecl *BlockDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) {
4761 return new (C, DC) BlockDecl(DC, L);
4762 }
4763
CreateDeserialized(ASTContext & C,unsigned ID)4764 BlockDecl *BlockDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4765 return new (C, ID) BlockDecl(nullptr, SourceLocation());
4766 }
4767
CapturedDecl(DeclContext * DC,unsigned NumParams)4768 CapturedDecl::CapturedDecl(DeclContext *DC, unsigned NumParams)
4769 : Decl(Captured, DC, SourceLocation()), DeclContext(Captured),
4770 NumParams(NumParams), ContextParam(0), BodyAndNothrow(nullptr, false) {}
4771
Create(ASTContext & C,DeclContext * DC,unsigned NumParams)4772 CapturedDecl *CapturedDecl::Create(ASTContext &C, DeclContext *DC,
4773 unsigned NumParams) {
4774 return new (C, DC, additionalSizeToAlloc<ImplicitParamDecl *>(NumParams))
4775 CapturedDecl(DC, NumParams);
4776 }
4777
CreateDeserialized(ASTContext & C,unsigned ID,unsigned NumParams)4778 CapturedDecl *CapturedDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4779 unsigned NumParams) {
4780 return new (C, ID, additionalSizeToAlloc<ImplicitParamDecl *>(NumParams))
4781 CapturedDecl(nullptr, NumParams);
4782 }
4783
getBody() const4784 Stmt *CapturedDecl::getBody() const { return BodyAndNothrow.getPointer(); }
setBody(Stmt * B)4785 void CapturedDecl::setBody(Stmt *B) { BodyAndNothrow.setPointer(B); }
4786
isNothrow() const4787 bool CapturedDecl::isNothrow() const { return BodyAndNothrow.getInt(); }
setNothrow(bool Nothrow)4788 void CapturedDecl::setNothrow(bool Nothrow) { BodyAndNothrow.setInt(Nothrow); }
4789
Create(ASTContext & C,EnumDecl * CD,SourceLocation L,IdentifierInfo * Id,QualType T,Expr * E,const llvm::APSInt & V)4790 EnumConstantDecl *EnumConstantDecl::Create(ASTContext &C, EnumDecl *CD,
4791 SourceLocation L,
4792 IdentifierInfo *Id, QualType T,
4793 Expr *E, const llvm::APSInt &V) {
4794 return new (C, CD) EnumConstantDecl(CD, L, Id, T, E, V);
4795 }
4796
4797 EnumConstantDecl *
CreateDeserialized(ASTContext & C,unsigned ID)4798 EnumConstantDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4799 return new (C, ID) EnumConstantDecl(nullptr, SourceLocation(), nullptr,
4800 QualType(), nullptr, llvm::APSInt());
4801 }
4802
anchor()4803 void IndirectFieldDecl::anchor() {}
4804
IndirectFieldDecl(ASTContext & C,DeclContext * DC,SourceLocation L,DeclarationName N,QualType T,MutableArrayRef<NamedDecl * > CH)4805 IndirectFieldDecl::IndirectFieldDecl(ASTContext &C, DeclContext *DC,
4806 SourceLocation L, DeclarationName N,
4807 QualType T,
4808 MutableArrayRef<NamedDecl *> CH)
4809 : ValueDecl(IndirectField, DC, L, N, T), Chaining(CH.data()),
4810 ChainingSize(CH.size()) {
4811 // In C++, indirect field declarations conflict with tag declarations in the
4812 // same scope, so add them to IDNS_Tag so that tag redeclaration finds them.
4813 if (C.getLangOpts().CPlusPlus)
4814 IdentifierNamespace |= IDNS_Tag;
4815 }
4816
4817 IndirectFieldDecl *
Create(ASTContext & C,DeclContext * DC,SourceLocation L,IdentifierInfo * Id,QualType T,llvm::MutableArrayRef<NamedDecl * > CH)4818 IndirectFieldDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L,
4819 IdentifierInfo *Id, QualType T,
4820 llvm::MutableArrayRef<NamedDecl *> CH) {
4821 return new (C, DC) IndirectFieldDecl(C, DC, L, Id, T, CH);
4822 }
4823
CreateDeserialized(ASTContext & C,unsigned ID)4824 IndirectFieldDecl *IndirectFieldDecl::CreateDeserialized(ASTContext &C,
4825 unsigned ID) {
4826 return new (C, ID) IndirectFieldDecl(C, nullptr, SourceLocation(),
4827 DeclarationName(), QualType(), None);
4828 }
4829
getSourceRange() const4830 SourceRange EnumConstantDecl::getSourceRange() const {
4831 SourceLocation End = getLocation();
4832 if (Init)
4833 End = Init->getEndLoc();
4834 return SourceRange(getLocation(), End);
4835 }
4836
anchor()4837 void TypeDecl::anchor() {}
4838
Create(ASTContext & C,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,IdentifierInfo * Id,TypeSourceInfo * TInfo)4839 TypedefDecl *TypedefDecl::Create(ASTContext &C, DeclContext *DC,
4840 SourceLocation StartLoc, SourceLocation IdLoc,
4841 IdentifierInfo *Id, TypeSourceInfo *TInfo) {
4842 return new (C, DC) TypedefDecl(C, DC, StartLoc, IdLoc, Id, TInfo);
4843 }
4844
anchor()4845 void TypedefNameDecl::anchor() {}
4846
getAnonDeclWithTypedefName(bool AnyRedecl) const4847 TagDecl *TypedefNameDecl::getAnonDeclWithTypedefName(bool AnyRedecl) const {
4848 if (auto *TT = getTypeSourceInfo()->getType()->getAs<TagType>()) {
4849 auto *OwningTypedef = TT->getDecl()->getTypedefNameForAnonDecl();
4850 auto *ThisTypedef = this;
4851 if (AnyRedecl && OwningTypedef) {
4852 OwningTypedef = OwningTypedef->getCanonicalDecl();
4853 ThisTypedef = ThisTypedef->getCanonicalDecl();
4854 }
4855 if (OwningTypedef == ThisTypedef)
4856 return TT->getDecl();
4857 }
4858
4859 return nullptr;
4860 }
4861
isTransparentTagSlow() const4862 bool TypedefNameDecl::isTransparentTagSlow() const {
4863 auto determineIsTransparent = [&]() {
4864 if (auto *TT = getUnderlyingType()->getAs<TagType>()) {
4865 if (auto *TD = TT->getDecl()) {
4866 if (TD->getName() != getName())
4867 return false;
4868 SourceLocation TTLoc = getLocation();
4869 SourceLocation TDLoc = TD->getLocation();
4870 if (!TTLoc.isMacroID() || !TDLoc.isMacroID())
4871 return false;
4872 SourceManager &SM = getASTContext().getSourceManager();
4873 return SM.getSpellingLoc(TTLoc) == SM.getSpellingLoc(TDLoc);
4874 }
4875 }
4876 return false;
4877 };
4878
4879 bool isTransparent = determineIsTransparent();
4880 MaybeModedTInfo.setInt((isTransparent << 1) | 1);
4881 return isTransparent;
4882 }
4883
CreateDeserialized(ASTContext & C,unsigned ID)4884 TypedefDecl *TypedefDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4885 return new (C, ID) TypedefDecl(C, nullptr, SourceLocation(), SourceLocation(),
4886 nullptr, nullptr);
4887 }
4888
Create(ASTContext & C,DeclContext * DC,SourceLocation StartLoc,SourceLocation IdLoc,IdentifierInfo * Id,TypeSourceInfo * TInfo)4889 TypeAliasDecl *TypeAliasDecl::Create(ASTContext &C, DeclContext *DC,
4890 SourceLocation StartLoc,
4891 SourceLocation IdLoc, IdentifierInfo *Id,
4892 TypeSourceInfo *TInfo) {
4893 return new (C, DC) TypeAliasDecl(C, DC, StartLoc, IdLoc, Id, TInfo);
4894 }
4895
CreateDeserialized(ASTContext & C,unsigned ID)4896 TypeAliasDecl *TypeAliasDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4897 return new (C, ID) TypeAliasDecl(C, nullptr, SourceLocation(),
4898 SourceLocation(), nullptr, nullptr);
4899 }
4900
getSourceRange() const4901 SourceRange TypedefDecl::getSourceRange() const {
4902 SourceLocation RangeEnd = getLocation();
4903 if (TypeSourceInfo *TInfo = getTypeSourceInfo()) {
4904 if (typeIsPostfix(TInfo->getType()))
4905 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
4906 }
4907 return SourceRange(getBeginLoc(), RangeEnd);
4908 }
4909
getSourceRange() const4910 SourceRange TypeAliasDecl::getSourceRange() const {
4911 SourceLocation RangeEnd = getBeginLoc();
4912 if (TypeSourceInfo *TInfo = getTypeSourceInfo())
4913 RangeEnd = TInfo->getTypeLoc().getSourceRange().getEnd();
4914 return SourceRange(getBeginLoc(), RangeEnd);
4915 }
4916
anchor()4917 void FileScopeAsmDecl::anchor() {}
4918
Create(ASTContext & C,DeclContext * DC,StringLiteral * Str,SourceLocation AsmLoc,SourceLocation RParenLoc)4919 FileScopeAsmDecl *FileScopeAsmDecl::Create(ASTContext &C, DeclContext *DC,
4920 StringLiteral *Str,
4921 SourceLocation AsmLoc,
4922 SourceLocation RParenLoc) {
4923 return new (C, DC) FileScopeAsmDecl(DC, Str, AsmLoc, RParenLoc);
4924 }
4925
CreateDeserialized(ASTContext & C,unsigned ID)4926 FileScopeAsmDecl *FileScopeAsmDecl::CreateDeserialized(ASTContext &C,
4927 unsigned ID) {
4928 return new (C, ID) FileScopeAsmDecl(nullptr, nullptr, SourceLocation(),
4929 SourceLocation());
4930 }
4931
anchor()4932 void EmptyDecl::anchor() {}
4933
Create(ASTContext & C,DeclContext * DC,SourceLocation L)4934 EmptyDecl *EmptyDecl::Create(ASTContext &C, DeclContext *DC, SourceLocation L) {
4935 return new (C, DC) EmptyDecl(DC, L);
4936 }
4937
CreateDeserialized(ASTContext & C,unsigned ID)4938 EmptyDecl *EmptyDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
4939 return new (C, ID) EmptyDecl(nullptr, SourceLocation());
4940 }
4941
4942 //===----------------------------------------------------------------------===//
4943 // ImportDecl Implementation
4944 //===----------------------------------------------------------------------===//
4945
4946 /// Retrieve the number of module identifiers needed to name the given
4947 /// module.
getNumModuleIdentifiers(Module * Mod)4948 static unsigned getNumModuleIdentifiers(Module *Mod) {
4949 unsigned Result = 1;
4950 while (Mod->Parent) {
4951 Mod = Mod->Parent;
4952 ++Result;
4953 }
4954 return Result;
4955 }
4956
ImportDecl(DeclContext * DC,SourceLocation StartLoc,Module * Imported,ArrayRef<SourceLocation> IdentifierLocs)4957 ImportDecl::ImportDecl(DeclContext *DC, SourceLocation StartLoc,
4958 Module *Imported,
4959 ArrayRef<SourceLocation> IdentifierLocs)
4960 : Decl(Import, DC, StartLoc), ImportedModule(Imported),
4961 NextLocalImportAndComplete(nullptr, true) {
4962 assert(getNumModuleIdentifiers(Imported) == IdentifierLocs.size());
4963 auto *StoredLocs = getTrailingObjects<SourceLocation>();
4964 std::uninitialized_copy(IdentifierLocs.begin(), IdentifierLocs.end(),
4965 StoredLocs);
4966 }
4967
ImportDecl(DeclContext * DC,SourceLocation StartLoc,Module * Imported,SourceLocation EndLoc)4968 ImportDecl::ImportDecl(DeclContext *DC, SourceLocation StartLoc,
4969 Module *Imported, SourceLocation EndLoc)
4970 : Decl(Import, DC, StartLoc), ImportedModule(Imported),
4971 NextLocalImportAndComplete(nullptr, false) {
4972 *getTrailingObjects<SourceLocation>() = EndLoc;
4973 }
4974
Create(ASTContext & C,DeclContext * DC,SourceLocation StartLoc,Module * Imported,ArrayRef<SourceLocation> IdentifierLocs)4975 ImportDecl *ImportDecl::Create(ASTContext &C, DeclContext *DC,
4976 SourceLocation StartLoc, Module *Imported,
4977 ArrayRef<SourceLocation> IdentifierLocs) {
4978 return new (C, DC,
4979 additionalSizeToAlloc<SourceLocation>(IdentifierLocs.size()))
4980 ImportDecl(DC, StartLoc, Imported, IdentifierLocs);
4981 }
4982
CreateImplicit(ASTContext & C,DeclContext * DC,SourceLocation StartLoc,Module * Imported,SourceLocation EndLoc)4983 ImportDecl *ImportDecl::CreateImplicit(ASTContext &C, DeclContext *DC,
4984 SourceLocation StartLoc,
4985 Module *Imported,
4986 SourceLocation EndLoc) {
4987 ImportDecl *Import = new (C, DC, additionalSizeToAlloc<SourceLocation>(1))
4988 ImportDecl(DC, StartLoc, Imported, EndLoc);
4989 Import->setImplicit();
4990 return Import;
4991 }
4992
CreateDeserialized(ASTContext & C,unsigned ID,unsigned NumLocations)4993 ImportDecl *ImportDecl::CreateDeserialized(ASTContext &C, unsigned ID,
4994 unsigned NumLocations) {
4995 return new (C, ID, additionalSizeToAlloc<SourceLocation>(NumLocations))
4996 ImportDecl(EmptyShell());
4997 }
4998
getIdentifierLocs() const4999 ArrayRef<SourceLocation> ImportDecl::getIdentifierLocs() const {
5000 if (!isImportComplete())
5001 return None;
5002
5003 const auto *StoredLocs = getTrailingObjects<SourceLocation>();
5004 return llvm::makeArrayRef(StoredLocs,
5005 getNumModuleIdentifiers(getImportedModule()));
5006 }
5007
getSourceRange() const5008 SourceRange ImportDecl::getSourceRange() const {
5009 if (!isImportComplete())
5010 return SourceRange(getLocation(), *getTrailingObjects<SourceLocation>());
5011
5012 return SourceRange(getLocation(), getIdentifierLocs().back());
5013 }
5014
5015 //===----------------------------------------------------------------------===//
5016 // ExportDecl Implementation
5017 //===----------------------------------------------------------------------===//
5018
anchor()5019 void ExportDecl::anchor() {}
5020
Create(ASTContext & C,DeclContext * DC,SourceLocation ExportLoc)5021 ExportDecl *ExportDecl::Create(ASTContext &C, DeclContext *DC,
5022 SourceLocation ExportLoc) {
5023 return new (C, DC) ExportDecl(DC, ExportLoc);
5024 }
5025
CreateDeserialized(ASTContext & C,unsigned ID)5026 ExportDecl *ExportDecl::CreateDeserialized(ASTContext &C, unsigned ID) {
5027 return new (C, ID) ExportDecl(nullptr, SourceLocation());
5028 }
5029