clang  10.0.0svn
DeclBase.cpp
Go to the documentation of this file.
1 //===- DeclBase.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 and DeclContext classes.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "clang/AST/DeclBase.h"
14 #include "clang/AST/ASTContext.h"
15 #include "clang/AST/ASTLambda.h"
17 #include "clang/AST/Attr.h"
18 #include "clang/AST/AttrIterator.h"
19 #include "clang/AST/Decl.h"
20 #include "clang/AST/DeclCXX.h"
22 #include "clang/AST/DeclFriend.h"
23 #include "clang/AST/DeclObjC.h"
24 #include "clang/AST/DeclOpenMP.h"
25 #include "clang/AST/DeclTemplate.h"
28 #include "clang/AST/Stmt.h"
29 #include "clang/AST/Type.h"
31 #include "clang/Basic/LLVM.h"
36 #include "clang/Basic/TargetInfo.h"
37 #include "llvm/ADT/ArrayRef.h"
38 #include "llvm/ADT/PointerIntPair.h"
39 #include "llvm/ADT/SmallVector.h"
40 #include "llvm/ADT/StringRef.h"
41 #include "llvm/Support/Casting.h"
42 #include "llvm/Support/ErrorHandling.h"
43 #include "llvm/Support/MathExtras.h"
44 #include "llvm/Support/VersionTuple.h"
45 #include "llvm/Support/raw_ostream.h"
46 #include <algorithm>
47 #include <cassert>
48 #include <cstddef>
49 #include <string>
50 #include <tuple>
51 #include <utility>
52 
53 using namespace clang;
54 
55 //===----------------------------------------------------------------------===//
56 // Statistics
57 //===----------------------------------------------------------------------===//
58 
59 #define DECL(DERIVED, BASE) static int n##DERIVED##s = 0;
60 #define ABSTRACT_DECL(DECL)
61 #include "clang/AST/DeclNodes.inc"
62 
65 }
66 
67 #define DECL(DERIVED, BASE) \
68  static_assert(alignof(Decl) >= alignof(DERIVED##Decl), \
69  "Alignment sufficient after objects prepended to " #DERIVED);
70 #define ABSTRACT_DECL(DECL)
71 #include "clang/AST/DeclNodes.inc"
72 
73 void *Decl::operator new(std::size_t Size, const ASTContext &Context,
74  unsigned ID, std::size_t Extra) {
75  // Allocate an extra 8 bytes worth of storage, which ensures that the
76  // resulting pointer will still be 8-byte aligned.
77  static_assert(sizeof(unsigned) * 2 >= alignof(Decl),
78  "Decl won't be misaligned");
79  void *Start = Context.Allocate(Size + Extra + 8);
80  void *Result = (char*)Start + 8;
81 
82  unsigned *PrefixPtr = (unsigned *)Result - 2;
83 
84  // Zero out the first 4 bytes; this is used to store the owning module ID.
85  PrefixPtr[0] = 0;
86 
87  // Store the global declaration ID in the second 4 bytes.
88  PrefixPtr[1] = ID;
89 
90  return Result;
91 }
92 
93 void *Decl::operator new(std::size_t Size, const ASTContext &Ctx,
94  DeclContext *Parent, std::size_t Extra) {
95  assert(!Parent || &Parent->getParentASTContext() == &Ctx);
96  // With local visibility enabled, we track the owning module even for local
97  // declarations. We create the TU decl early and may not yet know what the
98  // LangOpts are, so conservatively allocate the storage.
99  if (Ctx.getLangOpts().trackLocalOwningModule() || !Parent) {
100  // Ensure required alignment of the resulting object by adding extra
101  // padding at the start if required.
102  size_t ExtraAlign =
103  llvm::offsetToAlignment(sizeof(Module *), llvm::Align(alignof(Decl)));
104  auto *Buffer = reinterpret_cast<char *>(
105  ::operator new(ExtraAlign + sizeof(Module *) + Size + Extra, Ctx));
106  Buffer += ExtraAlign;
107  auto *ParentModule =
108  Parent ? cast<Decl>(Parent)->getOwningModule() : nullptr;
109  return new (Buffer) Module*(ParentModule) + 1;
110  }
111  return ::operator new(Size + Extra, Ctx);
112 }
113 
114 Module *Decl::getOwningModuleSlow() const {
115  assert(isFromASTFile() && "Not from AST file?");
117 }
118 
121 }
122 
123 const char *Decl::getDeclKindName() const {
124  switch (DeclKind) {
125  default: llvm_unreachable("Declaration not in DeclNodes.inc!");
126 #define DECL(DERIVED, BASE) case DERIVED: return #DERIVED;
127 #define ABSTRACT_DECL(DECL)
128 #include "clang/AST/DeclNodes.inc"
129  }
130 }
131 
132 void Decl::setInvalidDecl(bool Invalid) {
133  InvalidDecl = Invalid;
134  assert(!isa<TagDecl>(this) || !cast<TagDecl>(this)->isCompleteDefinition());
135  if (!Invalid) {
136  return;
137  }
138 
139  if (!isa<ParmVarDecl>(this)) {
140  // Defensive maneuver for ill-formed code: we're likely not to make it to
141  // a point where we set the access specifier, so default it to "public"
142  // to avoid triggering asserts elsewhere in the front end.
144  }
145 
146  // Marking a DecompositionDecl as invalid implies all the child BindingDecl's
147  // are invalid too.
148  if (auto *DD = dyn_cast<DecompositionDecl>(this)) {
149  for (auto *Binding : DD->bindings()) {
150  Binding->setInvalidDecl();
151  }
152  }
153 }
154 
155 const char *DeclContext::getDeclKindName() const {
156  switch (getDeclKind()) {
157 #define DECL(DERIVED, BASE) case Decl::DERIVED: return #DERIVED;
158 #define ABSTRACT_DECL(DECL)
159 #include "clang/AST/DeclNodes.inc"
160  }
161  llvm_unreachable("Declaration context not in DeclNodes.inc!");
162 }
163 
164 bool Decl::StatisticsEnabled = false;
166  StatisticsEnabled = true;
167 }
168 
170  llvm::errs() << "\n*** Decl Stats:\n";
171 
172  int totalDecls = 0;
173 #define DECL(DERIVED, BASE) totalDecls += n##DERIVED##s;
174 #define ABSTRACT_DECL(DECL)
175 #include "clang/AST/DeclNodes.inc"
176  llvm::errs() << " " << totalDecls << " decls total.\n";
177 
178  int totalBytes = 0;
179 #define DECL(DERIVED, BASE) \
180  if (n##DERIVED##s > 0) { \
181  totalBytes += (int)(n##DERIVED##s * sizeof(DERIVED##Decl)); \
182  llvm::errs() << " " << n##DERIVED##s << " " #DERIVED " decls, " \
183  << sizeof(DERIVED##Decl) << " each (" \
184  << n##DERIVED##s * sizeof(DERIVED##Decl) \
185  << " bytes)\n"; \
186  }
187 #define ABSTRACT_DECL(DECL)
188 #include "clang/AST/DeclNodes.inc"
189 
190  llvm::errs() << "Total bytes = " << totalBytes << "\n";
191 }
192 
193 void Decl::add(Kind k) {
194  switch (k) {
195 #define DECL(DERIVED, BASE) case DERIVED: ++n##DERIVED##s; break;
196 #define ABSTRACT_DECL(DECL)
197 #include "clang/AST/DeclNodes.inc"
198  }
199 }
200 
202  if (const auto *TTP = dyn_cast<TemplateTypeParmDecl>(this))
203  return TTP->isParameterPack();
204  if (const auto *NTTP = dyn_cast<NonTypeTemplateParmDecl>(this))
205  return NTTP->isParameterPack();
206  if (const auto *TTP = dyn_cast<TemplateTemplateParmDecl>(this))
207  return TTP->isParameterPack();
208  return false;
209 }
210 
211 bool Decl::isParameterPack() const {
212  if (const auto *Var = dyn_cast<VarDecl>(this))
213  return Var->isParameterPack();
214 
215  return isTemplateParameterPack();
216 }
217 
219  if (auto *FD = dyn_cast<FunctionDecl>(this))
220  return FD;
221  if (const auto *FTD = dyn_cast<FunctionTemplateDecl>(this))
222  return FTD->getTemplatedDecl();
223  return nullptr;
224 }
225 
226 bool Decl::isTemplateDecl() const {
227  return isa<TemplateDecl>(this);
228 }
229 
231  if (auto *FD = dyn_cast<FunctionDecl>(this))
232  return FD->getDescribedFunctionTemplate();
233  else if (auto *RD = dyn_cast<CXXRecordDecl>(this))
234  return RD->getDescribedClassTemplate();
235  else if (auto *VD = dyn_cast<VarDecl>(this))
236  return VD->getDescribedVarTemplate();
237  else if (auto *AD = dyn_cast<TypeAliasDecl>(this))
238  return AD->getDescribedAliasTemplate();
239 
240  return nullptr;
241 }
242 
243 bool Decl::isTemplated() const {
244  // A declaration is dependent if it is a template or a template pattern, or
245  // is within (lexcially for a friend, semantically otherwise) a dependent
246  // context.
247  // FIXME: Should local extern declarations be treated like friends?
248  if (auto *AsDC = dyn_cast<DeclContext>(this))
249  return AsDC->isDependentContext();
251  return DC->isDependentContext() || isTemplateDecl() || getDescribedTemplate();
252 }
253 
255  for (const DeclContext *DC = getDeclContext();
256  DC && !DC->isTranslationUnit() && !DC->isNamespace();
257  DC = DC->getParent())
258  if (DC->isFunctionOrMethod())
259  return DC;
260 
261  return nullptr;
262 }
263 
264 //===----------------------------------------------------------------------===//
265 // PrettyStackTraceDecl Implementation
266 //===----------------------------------------------------------------------===//
267 
268 void PrettyStackTraceDecl::print(raw_ostream &OS) const {
269  SourceLocation TheLoc = Loc;
270  if (TheLoc.isInvalid() && TheDecl)
271  TheLoc = TheDecl->getLocation();
272 
273  if (TheLoc.isValid()) {
274  TheLoc.print(OS, SM);
275  OS << ": ";
276  }
277 
278  OS << Message;
279 
280  if (const auto *DN = dyn_cast_or_null<NamedDecl>(TheDecl)) {
281  OS << " '";
282  DN->printQualifiedName(OS);
283  OS << '\'';
284  }
285  OS << '\n';
286 }
287 
288 //===----------------------------------------------------------------------===//
289 // Decl Implementation
290 //===----------------------------------------------------------------------===//
291 
292 // Out-of-line virtual method providing a home for Decl.
293 Decl::~Decl() = default;
294 
296  DeclCtx = DC;
297 }
298 
300  if (DC == getLexicalDeclContext())
301  return;
302 
303  if (isInSemaDC()) {
304  setDeclContextsImpl(getDeclContext(), DC, getASTContext());
305  } else {
306  getMultipleDC()->LexicalDC = DC;
307  }
308 
309  // FIXME: We shouldn't be changing the lexical context of declarations
310  // imported from AST files.
311  if (!isFromASTFile()) {
312  setModuleOwnershipKind(getModuleOwnershipKindForChildOf(DC));
313  if (hasOwningModule())
314  setLocalOwningModule(cast<Decl>(DC)->getOwningModule());
315  }
316 
317  assert(
319  getOwningModule()) &&
320  "hidden declaration has no owning module");
321 }
322 
323 void Decl::setDeclContextsImpl(DeclContext *SemaDC, DeclContext *LexicalDC,
324  ASTContext &Ctx) {
325  if (SemaDC == LexicalDC) {
326  DeclCtx = SemaDC;
327  } else {
328  auto *MDC = new (Ctx) Decl::MultipleDC();
329  MDC->SemanticDC = SemaDC;
330  MDC->LexicalDC = LexicalDC;
331  DeclCtx = MDC;
332  }
333 }
334 
336  const DeclContext *LDC = getLexicalDeclContext();
337  while (true) {
338  if (LDC->isFunctionOrMethod())
339  return true;
340  if (!isa<TagDecl>(LDC))
341  return false;
342  LDC = LDC->getLexicalParent();
343  }
344  return false;
345 }
346 
348  for (const DeclContext *DC = getDeclContext(); DC; DC = DC->getParent()) {
349  if (const auto *ND = dyn_cast<NamespaceDecl>(DC))
350  if (ND->isAnonymousNamespace())
351  return true;
352  }
353 
354  return false;
355 }
356 
358  const DeclContext *DC = getDeclContext();
359  return DC && DC->isStdNamespace();
360 }
361 
363  if (auto *TUD = dyn_cast<TranslationUnitDecl>(this))
364  return TUD;
365 
366  DeclContext *DC = getDeclContext();
367  assert(DC && "This decl is not contained in a translation unit!");
368 
369  while (!DC->isTranslationUnit()) {
370  DC = DC->getParent();
371  assert(DC && "This decl is not contained in a translation unit!");
372  }
373 
374  return cast<TranslationUnitDecl>(DC);
375 }
376 
379 }
380 
383 }
384 
385 unsigned Decl::getMaxAlignment() const {
386  if (!hasAttrs())
387  return 0;
388 
389  unsigned Align = 0;
390  const AttrVec &V = getAttrs();
391  ASTContext &Ctx = getASTContext();
392  specific_attr_iterator<AlignedAttr> I(V.begin()), E(V.end());
393  for (; I != E; ++I)
394  Align = std::max(Align, I->getAlignment(Ctx));
395  return Align;
396 }
397 
398 bool Decl::isUsed(bool CheckUsedAttr) const {
399  const Decl *CanonD = getCanonicalDecl();
400  if (CanonD->Used)
401  return true;
402 
403  // Check for used attribute.
404  // Ask the most recent decl, since attributes accumulate in the redecl chain.
405  if (CheckUsedAttr && getMostRecentDecl()->hasAttr<UsedAttr>())
406  return true;
407 
408  // The information may have not been deserialized yet. Force deserialization
409  // to complete the needed information.
410  return getMostRecentDecl()->getCanonicalDecl()->Used;
411 }
412 
414  if (isUsed(false))
415  return;
416 
417  if (C.getASTMutationListener())
419 
420  setIsUsed();
421 }
422 
423 bool Decl::isReferenced() const {
424  if (Referenced)
425  return true;
426 
427  // Check redeclarations.
428  for (const auto *I : redecls())
429  if (I->Referenced)
430  return true;
431 
432  return false;
433 }
434 
435 ExternalSourceSymbolAttr *Decl::getExternalSourceSymbolAttr() const {
436  const Decl *Definition = nullptr;
437  if (auto *ID = dyn_cast<ObjCInterfaceDecl>(this)) {
438  Definition = ID->getDefinition();
439  } else if (auto *PD = dyn_cast<ObjCProtocolDecl>(this)) {
440  Definition = PD->getDefinition();
441  } else if (auto *TD = dyn_cast<TagDecl>(this)) {
442  Definition = TD->getDefinition();
443  }
444  if (!Definition)
445  Definition = this;
446 
447  if (auto *attr = Definition->getAttr<ExternalSourceSymbolAttr>())
448  return attr;
449  if (auto *dcd = dyn_cast<Decl>(getDeclContext())) {
450  return dcd->getAttr<ExternalSourceSymbolAttr>();
451  }
452 
453  return nullptr;
454 }
455 
456 bool Decl::hasDefiningAttr() const {
457  return hasAttr<AliasAttr>() || hasAttr<IFuncAttr>();
458 }
459 
460 const Attr *Decl::getDefiningAttr() const {
461  if (auto *AA = getAttr<AliasAttr>())
462  return AA;
463  if (auto *IFA = getAttr<IFuncAttr>())
464  return IFA;
465  return nullptr;
466 }
467 
468 static StringRef getRealizedPlatform(const AvailabilityAttr *A,
469  const ASTContext &Context) {
470  // Check if this is an App Extension "platform", and if so chop off
471  // the suffix for matching with the actual platform.
472  StringRef RealizedPlatform = A->getPlatform()->getName();
473  if (!Context.getLangOpts().AppExt)
474  return RealizedPlatform;
475  size_t suffix = RealizedPlatform.rfind("_app_extension");
476  if (suffix != StringRef::npos)
477  return RealizedPlatform.slice(0, suffix);
478  return RealizedPlatform;
479 }
480 
481 /// Determine the availability of the given declaration based on
482 /// the target platform.
483 ///
484 /// When it returns an availability result other than \c AR_Available,
485 /// if the \p Message parameter is non-NULL, it will be set to a
486 /// string describing why the entity is unavailable.
487 ///
488 /// FIXME: Make these strings localizable, since they end up in
489 /// diagnostics.
491  const AvailabilityAttr *A,
492  std::string *Message,
493  VersionTuple EnclosingVersion) {
494  if (EnclosingVersion.empty())
495  EnclosingVersion = Context.getTargetInfo().getPlatformMinVersion();
496 
497  if (EnclosingVersion.empty())
498  return AR_Available;
499 
500  StringRef ActualPlatform = A->getPlatform()->getName();
501  StringRef TargetPlatform = Context.getTargetInfo().getPlatformName();
502 
503  // Match the platform name.
504  if (getRealizedPlatform(A, Context) != TargetPlatform)
505  return AR_Available;
506 
507  StringRef PrettyPlatformName
508  = AvailabilityAttr::getPrettyPlatformName(ActualPlatform);
509 
510  if (PrettyPlatformName.empty())
511  PrettyPlatformName = ActualPlatform;
512 
513  std::string HintMessage;
514  if (!A->getMessage().empty()) {
515  HintMessage = " - ";
516  HintMessage += A->getMessage();
517  }
518 
519  // Make sure that this declaration has not been marked 'unavailable'.
520  if (A->getUnavailable()) {
521  if (Message) {
522  Message->clear();
523  llvm::raw_string_ostream Out(*Message);
524  Out << "not available on " << PrettyPlatformName
525  << HintMessage;
526  }
527 
528  return AR_Unavailable;
529  }
530 
531  // Make sure that this declaration has already been introduced.
532  if (!A->getIntroduced().empty() &&
533  EnclosingVersion < A->getIntroduced()) {
534  if (Message) {
535  Message->clear();
536  llvm::raw_string_ostream Out(*Message);
537  VersionTuple VTI(A->getIntroduced());
538  Out << "introduced in " << PrettyPlatformName << ' '
539  << VTI << HintMessage;
540  }
541 
542  return A->getStrict() ? AR_Unavailable : AR_NotYetIntroduced;
543  }
544 
545  // Make sure that this declaration hasn't been obsoleted.
546  if (!A->getObsoleted().empty() && EnclosingVersion >= A->getObsoleted()) {
547  if (Message) {
548  Message->clear();
549  llvm::raw_string_ostream Out(*Message);
550  VersionTuple VTO(A->getObsoleted());
551  Out << "obsoleted in " << PrettyPlatformName << ' '
552  << VTO << HintMessage;
553  }
554 
555  return AR_Unavailable;
556  }
557 
558  // Make sure that this declaration hasn't been deprecated.
559  if (!A->getDeprecated().empty() && EnclosingVersion >= A->getDeprecated()) {
560  if (Message) {
561  Message->clear();
562  llvm::raw_string_ostream Out(*Message);
563  VersionTuple VTD(A->getDeprecated());
564  Out << "first deprecated in " << PrettyPlatformName << ' '
565  << VTD << HintMessage;
566  }
567 
568  return AR_Deprecated;
569  }
570 
571  return AR_Available;
572 }
573 
575  VersionTuple EnclosingVersion,
576  StringRef *RealizedPlatform) const {
577  if (auto *FTD = dyn_cast<FunctionTemplateDecl>(this))
578  return FTD->getTemplatedDecl()->getAvailability(Message, EnclosingVersion,
579  RealizedPlatform);
580 
582  std::string ResultMessage;
583 
584  for (const auto *A : attrs()) {
585  if (const auto *Deprecated = dyn_cast<DeprecatedAttr>(A)) {
586  if (Result >= AR_Deprecated)
587  continue;
588 
589  if (Message)
590  ResultMessage = Deprecated->getMessage();
591 
592  Result = AR_Deprecated;
593  continue;
594  }
595 
596  if (const auto *Unavailable = dyn_cast<UnavailableAttr>(A)) {
597  if (Message)
598  *Message = Unavailable->getMessage();
599  return AR_Unavailable;
600  }
601 
602  if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) {
604  Message, EnclosingVersion);
605 
606  if (AR == AR_Unavailable) {
607  if (RealizedPlatform)
608  *RealizedPlatform = Availability->getPlatform()->getName();
609  return AR_Unavailable;
610  }
611 
612  if (AR > Result) {
613  Result = AR;
614  if (Message)
615  ResultMessage.swap(*Message);
616  }
617  continue;
618  }
619  }
620 
621  if (Message)
622  Message->swap(ResultMessage);
623  return Result;
624 }
625 
626 VersionTuple Decl::getVersionIntroduced() const {
627  const ASTContext &Context = getASTContext();
628  StringRef TargetPlatform = Context.getTargetInfo().getPlatformName();
629  for (const auto *A : attrs()) {
630  if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) {
631  if (getRealizedPlatform(Availability, Context) != TargetPlatform)
632  continue;
633  if (!Availability->getIntroduced().empty())
634  return Availability->getIntroduced();
635  }
636  }
637  return {};
638 }
639 
640 bool Decl::canBeWeakImported(bool &IsDefinition) const {
641  IsDefinition = false;
642 
643  // Variables, if they aren't definitions.
644  if (const auto *Var = dyn_cast<VarDecl>(this)) {
645  if (Var->isThisDeclarationADefinition()) {
646  IsDefinition = true;
647  return false;
648  }
649  return true;
650 
651  // Functions, if they aren't definitions.
652  } else if (const auto *FD = dyn_cast<FunctionDecl>(this)) {
653  if (FD->hasBody()) {
654  IsDefinition = true;
655  return false;
656  }
657  return true;
658 
659  // Objective-C classes, if this is the non-fragile runtime.
660  } else if (isa<ObjCInterfaceDecl>(this) &&
662  return true;
663 
664  // Nothing else.
665  } else {
666  return false;
667  }
668 }
669 
670 bool Decl::isWeakImported() const {
671  bool IsDefinition;
672  if (!canBeWeakImported(IsDefinition))
673  return false;
674 
675  for (const auto *A : attrs()) {
676  if (isa<WeakImportAttr>(A))
677  return true;
678 
679  if (const auto *Availability = dyn_cast<AvailabilityAttr>(A)) {
680  if (CheckAvailability(getASTContext(), Availability, nullptr,
681  VersionTuple()) == AR_NotYetIntroduced)
682  return true;
683  }
684  }
685 
686  return false;
687 }
688 
690  switch (DeclKind) {
691  case Function:
692  case CXXDeductionGuide:
693  case CXXMethod:
694  case CXXConstructor:
695  case ConstructorUsingShadow:
696  case CXXDestructor:
697  case CXXConversion:
698  case EnumConstant:
699  case Var:
700  case ImplicitParam:
701  case ParmVar:
702  case ObjCMethod:
703  case ObjCProperty:
704  case MSProperty:
705  return IDNS_Ordinary;
706  case Label:
707  return IDNS_Label;
708  case IndirectField:
709  return IDNS_Ordinary | IDNS_Member;
710 
711  case Binding:
712  case NonTypeTemplateParm:
713  case VarTemplate:
714  case Concept:
715  // These (C++-only) declarations are found by redeclaration lookup for
716  // tag types, so we include them in the tag namespace.
717  return IDNS_Ordinary | IDNS_Tag;
718 
719  case ObjCCompatibleAlias:
720  case ObjCInterface:
721  return IDNS_Ordinary | IDNS_Type;
722 
723  case Typedef:
724  case TypeAlias:
725  case TemplateTypeParm:
726  case ObjCTypeParam:
727  return IDNS_Ordinary | IDNS_Type;
728 
729  case UnresolvedUsingTypename:
731 
732  case UsingShadow:
733  return 0; // we'll actually overwrite this later
734 
735  case UnresolvedUsingValue:
736  return IDNS_Ordinary | IDNS_Using;
737 
738  case Using:
739  case UsingPack:
740  return IDNS_Using;
741 
742  case ObjCProtocol:
743  return IDNS_ObjCProtocol;
744 
745  case Field:
746  case ObjCAtDefsField:
747  case ObjCIvar:
748  return IDNS_Member;
749 
750  case Record:
751  case CXXRecord:
752  case Enum:
753  return IDNS_Tag | IDNS_Type;
754 
755  case Namespace:
756  case NamespaceAlias:
757  return IDNS_Namespace;
758 
759  case FunctionTemplate:
760  return IDNS_Ordinary;
761 
762  case ClassTemplate:
763  case TemplateTemplateParm:
764  case TypeAliasTemplate:
765  return IDNS_Ordinary | IDNS_Tag | IDNS_Type;
766 
767  case OMPDeclareReduction:
768  return IDNS_OMPReduction;
769 
770  case OMPDeclareMapper:
771  return IDNS_OMPMapper;
772 
773  // Never have names.
774  case Friend:
775  case FriendTemplate:
776  case AccessSpec:
777  case LinkageSpec:
778  case Export:
779  case FileScopeAsm:
780  case StaticAssert:
781  case ObjCPropertyImpl:
782  case PragmaComment:
783  case PragmaDetectMismatch:
784  case Block:
785  case Captured:
786  case TranslationUnit:
787  case ExternCContext:
788  case Decomposition:
789 
790  case UsingDirective:
791  case BuiltinTemplate:
792  case ClassTemplateSpecialization:
793  case ClassTemplatePartialSpecialization:
794  case ClassScopeFunctionSpecialization:
795  case VarTemplateSpecialization:
796  case VarTemplatePartialSpecialization:
797  case ObjCImplementation:
798  case ObjCCategory:
799  case ObjCCategoryImpl:
800  case Import:
801  case OMPThreadPrivate:
802  case OMPAllocate:
803  case OMPRequires:
804  case OMPCapturedExpr:
805  case Empty:
806  // Never looked up by name.
807  return 0;
808  }
809 
810  llvm_unreachable("Invalid DeclKind!");
811 }
812 
813 void Decl::setAttrsImpl(const AttrVec &attrs, ASTContext &Ctx) {
814  assert(!HasAttrs && "Decl already contains attrs.");
815 
816  AttrVec &AttrBlank = Ctx.getDeclAttrs(this);
817  assert(AttrBlank.empty() && "HasAttrs was wrong?");
818 
819  AttrBlank = attrs;
820  HasAttrs = true;
821 }
822 
824  if (!HasAttrs) return;
825 
826  HasAttrs = false;
828 }
829 
830 void Decl::addAttr(Attr *A) {
831  if (!hasAttrs()) {
832  setAttrs(AttrVec(1, A));
833  return;
834  }
835 
836  AttrVec &Attrs = getAttrs();
837  if (!A->isInherited()) {
838  Attrs.push_back(A);
839  return;
840  }
841 
842  // Attribute inheritance is processed after attribute parsing. To keep the
843  // order as in the source code, add inherited attributes before non-inherited
844  // ones.
845  auto I = Attrs.begin(), E = Attrs.end();
846  for (; I != E; ++I) {
847  if (!(*I)->isInherited())
848  break;
849  }
850  Attrs.insert(I, A);
851 }
852 
853 const AttrVec &Decl::getAttrs() const {
854  assert(HasAttrs && "No attrs to get!");
855  return getASTContext().getDeclAttrs(this);
856 }
857 
859  Decl::Kind DK = D->getDeclKind();
860  switch(DK) {
861 #define DECL(NAME, BASE)
862 #define DECL_CONTEXT(NAME) \
863  case Decl::NAME: \
864  return static_cast<NAME##Decl *>(const_cast<DeclContext *>(D));
865 #define DECL_CONTEXT_BASE(NAME)
866 #include "clang/AST/DeclNodes.inc"
867  default:
868 #define DECL(NAME, BASE)
869 #define DECL_CONTEXT_BASE(NAME) \
870  if (DK >= first##NAME && DK <= last##NAME) \
871  return static_cast<NAME##Decl *>(const_cast<DeclContext *>(D));
872 #include "clang/AST/DeclNodes.inc"
873  llvm_unreachable("a decl that inherits DeclContext isn't handled");
874  }
875 }
876 
878  Decl::Kind DK = D->getKind();
879  switch(DK) {
880 #define DECL(NAME, BASE)
881 #define DECL_CONTEXT(NAME) \
882  case Decl::NAME: \
883  return static_cast<NAME##Decl *>(const_cast<Decl *>(D));
884 #define DECL_CONTEXT_BASE(NAME)
885 #include "clang/AST/DeclNodes.inc"
886  default:
887 #define DECL(NAME, BASE)
888 #define DECL_CONTEXT_BASE(NAME) \
889  if (DK >= first##NAME && DK <= last##NAME) \
890  return static_cast<NAME##Decl *>(const_cast<Decl *>(D));
891 #include "clang/AST/DeclNodes.inc"
892  llvm_unreachable("a decl that inherits DeclContext isn't handled");
893  }
894 }
895 
897  // Special handling of FunctionDecl to avoid de-serializing the body from PCH.
898  // FunctionDecl stores EndRangeLoc for this purpose.
899  if (const auto *FD = dyn_cast<FunctionDecl>(this)) {
900  const FunctionDecl *Definition;
901  if (FD->hasBody(Definition))
902  return Definition->getSourceRange().getEnd();
903  return {};
904  }
905 
906  if (Stmt *Body = getBody())
907  return Body->getSourceRange().getEnd();
908 
909  return {};
910 }
911 
912 bool Decl::AccessDeclContextSanity() const {
913 #ifndef NDEBUG
914  // Suppress this check if any of the following hold:
915  // 1. this is the translation unit (and thus has no parent)
916  // 2. this is a template parameter (and thus doesn't belong to its context)
917  // 3. this is a non-type template parameter
918  // 4. the context is not a record
919  // 5. it's invalid
920  // 6. it's a C++0x static_assert.
921  // 7. it's a block literal declaration
922  if (isa<TranslationUnitDecl>(this) ||
923  isa<TemplateTypeParmDecl>(this) ||
924  isa<NonTypeTemplateParmDecl>(this) ||
925  !getDeclContext() ||
926  !isa<CXXRecordDecl>(getDeclContext()) ||
927  isInvalidDecl() ||
928  isa<StaticAssertDecl>(this) ||
929  isa<BlockDecl>(this) ||
930  // FIXME: a ParmVarDecl can have ClassTemplateSpecialization
931  // as DeclContext (?).
932  isa<ParmVarDecl>(this) ||
933  // FIXME: a ClassTemplateSpecialization or CXXRecordDecl can have
934  // AS_none as access specifier.
935  isa<CXXRecordDecl>(this) ||
936  isa<ClassScopeFunctionSpecializationDecl>(this))
937  return true;
938 
939  assert(Access != AS_none &&
940  "Access specifier is AS_none inside a record decl");
941 #endif
942  return true;
943 }
944 
945 static Decl::Kind getKind(const Decl *D) { return D->getKind(); }
946 static Decl::Kind getKind(const DeclContext *DC) { return DC->getDeclKind(); }
947 
948 int64_t Decl::getID() const {
949  return getASTContext().getAllocator().identifyKnownAlignedObject<Decl>(this);
950 }
951 
952 const FunctionType *Decl::getFunctionType(bool BlocksToo) const {
953  QualType Ty;
954  if (const auto *D = dyn_cast<ValueDecl>(this))
955  Ty = D->getType();
956  else if (const auto *D = dyn_cast<TypedefNameDecl>(this))
957  Ty = D->getUnderlyingType();
958  else
959  return nullptr;
960 
961  if (Ty->isFunctionPointerType())
962  Ty = Ty->castAs<PointerType>()->getPointeeType();
963  else if (Ty->isFunctionReferenceType())
964  Ty = Ty->castAs<ReferenceType>()->getPointeeType();
965  else if (BlocksToo && Ty->isBlockPointerType())
966  Ty = Ty->castAs<BlockPointerType>()->getPointeeType();
967 
968  return Ty->getAs<FunctionType>();
969 }
970 
971 /// Starting at a given context (a Decl or DeclContext), look for a
972 /// code context that is not a closure (a lambda, block, etc.).
973 template <class T> static Decl *getNonClosureContext(T *D) {
974  if (getKind(D) == Decl::CXXMethod) {
975  auto *MD = cast<CXXMethodDecl>(D);
976  if (MD->getOverloadedOperator() == OO_Call &&
977  MD->getParent()->isLambda())
978  return getNonClosureContext(MD->getParent()->getParent());
979  return MD;
980  } else if (auto *FD = dyn_cast<FunctionDecl>(D))
981  return FD;
982  else if (auto *MD = dyn_cast<ObjCMethodDecl>(D))
983  return MD;
984  else if (auto *BD = dyn_cast<BlockDecl>(D))
985  return getNonClosureContext(BD->getParent());
986  else if (auto *CD = dyn_cast<CapturedDecl>(D))
987  return getNonClosureContext(CD->getParent());
988  else
989  return nullptr;
990 }
991 
994 }
995 
998 }
999 
1000 //===----------------------------------------------------------------------===//
1001 // DeclContext Implementation
1002 //===----------------------------------------------------------------------===//
1003 
1005  DeclContextBits.DeclKind = K;
1006  setHasExternalLexicalStorage(false);
1007  setHasExternalVisibleStorage(false);
1008  setNeedToReconcileExternalVisibleStorage(false);
1009  setHasLazyLocalLexicalLookups(false);
1010  setHasLazyExternalLexicalLookups(false);
1011  setUseQualifiedLookup(false);
1012 }
1013 
1014 bool DeclContext::classof(const Decl *D) {
1015  switch (D->getKind()) {
1016 #define DECL(NAME, BASE)
1017 #define DECL_CONTEXT(NAME) case Decl::NAME:
1018 #define DECL_CONTEXT_BASE(NAME)
1019 #include "clang/AST/DeclNodes.inc"
1020  return true;
1021  default:
1022 #define DECL(NAME, BASE)
1023 #define DECL_CONTEXT_BASE(NAME) \
1024  if (D->getKind() >= Decl::first##NAME && \
1025  D->getKind() <= Decl::last##NAME) \
1026  return true;
1027 #include "clang/AST/DeclNodes.inc"
1028  return false;
1029  }
1030 }
1031 
1032 DeclContext::~DeclContext() = default;
1033 
1034 /// Find the parent context of this context that will be
1035 /// used for unqualified name lookup.
1036 ///
1037 /// Generally, the parent lookup context is the semantic context. However, for
1038 /// a friend function the parent lookup context is the lexical context, which
1039 /// is the class in which the friend is declared.
1041  // FIXME: Find a better way to identify friends.
1042  if (isa<FunctionDecl>(this))
1043  if (getParent()->getRedeclContext()->isFileContext() &&
1044  getLexicalParent()->getRedeclContext()->isRecord())
1045  return getLexicalParent();
1046 
1047  // A lookup within the call operator of a lambda never looks in the lambda
1048  // class; instead, skip to the context in which that closure type is
1049  // declared.
1050  if (isLambdaCallOperator(this))
1051  return getParent()->getParent();
1052 
1053  return getParent();
1054 }
1055 
1057  const DeclContext *Ctx = this;
1058 
1059  do {
1060  if (Ctx->isClosure())
1061  return cast<BlockDecl>(Ctx);
1062  Ctx = Ctx->getParent();
1063  } while (Ctx);
1064 
1065  return nullptr;
1066 }
1067 
1069  return isNamespace() &&
1070  cast<NamespaceDecl>(this)->isInline();
1071 }
1072 
1074  if (!isNamespace())
1075  return false;
1076 
1077  const auto *ND = cast<NamespaceDecl>(this);
1078  if (ND->isInline()) {
1079  return ND->getParent()->isStdNamespace();
1080  }
1081 
1082  if (!getParent()->getRedeclContext()->isTranslationUnit())
1083  return false;
1084 
1085  const IdentifierInfo *II = ND->getIdentifier();
1086  return II && II->isStr("std");
1087 }
1088 
1090  if (isFileContext())
1091  return false;
1092 
1093  if (isa<ClassTemplatePartialSpecializationDecl>(this))
1094  return true;
1095 
1096  if (const auto *Record = dyn_cast<CXXRecordDecl>(this)) {
1097  if (Record->getDescribedClassTemplate())
1098  return true;
1099 
1100  if (Record->isDependentLambda())
1101  return true;
1102  }
1103 
1104  if (const auto *Function = dyn_cast<FunctionDecl>(this)) {
1105  if (Function->getDescribedFunctionTemplate())
1106  return true;
1107 
1108  // Friend function declarations are dependent if their *lexical*
1109  // context is dependent.
1110  if (cast<Decl>(this)->getFriendObjectKind())
1111  return getLexicalParent()->isDependentContext();
1112  }
1113 
1114  // FIXME: A variable template is a dependent context, but is not a
1115  // DeclContext. A context within it (such as a lambda-expression)
1116  // should be considered dependent.
1117 
1118  return getParent() && getParent()->isDependentContext();
1119 }
1120 
1122  if (getDeclKind() == Decl::Enum)
1123  return !cast<EnumDecl>(this)->isScoped();
1124  else if (getDeclKind() == Decl::LinkageSpec || getDeclKind() == Decl::Export)
1125  return true;
1126 
1127  return false;
1128 }
1129 
1130 static bool isLinkageSpecContext(const DeclContext *DC,
1132  while (DC->getDeclKind() != Decl::TranslationUnit) {
1133  if (DC->getDeclKind() == Decl::LinkageSpec)
1134  return cast<LinkageSpecDecl>(DC)->getLanguage() == ID;
1135  DC = DC->getLexicalParent();
1136  }
1137  return false;
1138 }
1139 
1142 }
1143 
1145  const DeclContext *DC = this;
1146  while (DC->getDeclKind() != Decl::TranslationUnit) {
1147  if (DC->getDeclKind() == Decl::LinkageSpec &&
1148  cast<LinkageSpecDecl>(DC)->getLanguage() == LinkageSpecDecl::lang_c)
1149  return cast<LinkageSpecDecl>(DC);
1150  DC = DC->getLexicalParent();
1151  }
1152  return nullptr;
1153 }
1154 
1157 }
1158 
1159 bool DeclContext::Encloses(const DeclContext *DC) const {
1160  if (getPrimaryContext() != this)
1161  return getPrimaryContext()->Encloses(DC);
1162 
1163  for (; DC; DC = DC->getParent())
1164  if (DC->getPrimaryContext() == this)
1165  return true;
1166  return false;
1167 }
1168 
1170  switch (getDeclKind()) {
1171  case Decl::TranslationUnit:
1172  case Decl::ExternCContext:
1173  case Decl::LinkageSpec:
1174  case Decl::Export:
1175  case Decl::Block:
1176  case Decl::Captured:
1177  case Decl::OMPDeclareReduction:
1178  case Decl::OMPDeclareMapper:
1179  // There is only one DeclContext for these entities.
1180  return this;
1181 
1182  case Decl::Namespace:
1183  // The original namespace is our primary context.
1184  return static_cast<NamespaceDecl *>(this)->getOriginalNamespace();
1185 
1186  case Decl::ObjCMethod:
1187  return this;
1188 
1189  case Decl::ObjCInterface:
1190  if (auto *OID = dyn_cast<ObjCInterfaceDecl>(this))
1191  if (auto *Def = OID->getDefinition())
1192  return Def;
1193  return this;
1194 
1195  case Decl::ObjCProtocol:
1196  if (auto *OPD = dyn_cast<ObjCProtocolDecl>(this))
1197  if (auto *Def = OPD->getDefinition())
1198  return Def;
1199  return this;
1200 
1201  case Decl::ObjCCategory:
1202  return this;
1203 
1204  case Decl::ObjCImplementation:
1205  case Decl::ObjCCategoryImpl:
1206  return this;
1207 
1208  default:
1209  if (getDeclKind() >= Decl::firstTag && getDeclKind() <= Decl::lastTag) {
1210  // If this is a tag type that has a definition or is currently
1211  // being defined, that definition is our primary context.
1212  auto *Tag = cast<TagDecl>(this);
1213 
1214  if (TagDecl *Def = Tag->getDefinition())
1215  return Def;
1216 
1217  if (const auto *TagTy = dyn_cast<TagType>(Tag->getTypeForDecl())) {
1218  // Note, TagType::getDecl returns the (partial) definition one exists.
1219  TagDecl *PossiblePartialDef = TagTy->getDecl();
1220  if (PossiblePartialDef->isBeingDefined())
1221  return PossiblePartialDef;
1222  } else {
1223  assert(isa<InjectedClassNameType>(Tag->getTypeForDecl()));
1224  }
1225 
1226  return Tag;
1227  }
1228 
1229  assert(getDeclKind() >= Decl::firstFunction &&
1230  getDeclKind() <= Decl::lastFunction &&
1231  "Unknown DeclContext kind");
1232  return this;
1233  }
1234 }
1235 
1236 void
1238  Contexts.clear();
1239 
1240  if (getDeclKind() != Decl::Namespace) {
1241  Contexts.push_back(this);
1242  return;
1243  }
1244 
1245  auto *Self = static_cast<NamespaceDecl *>(this);
1246  for (NamespaceDecl *N = Self->getMostRecentDecl(); N;
1247  N = N->getPreviousDecl())
1248  Contexts.push_back(N);
1249 
1250  std::reverse(Contexts.begin(), Contexts.end());
1251 }
1252 
1253 std::pair<Decl *, Decl *>
1255  bool FieldsAlreadyLoaded) {
1256  // Build up a chain of declarations via the Decl::NextInContextAndBits field.
1257  Decl *FirstNewDecl = nullptr;
1258  Decl *PrevDecl = nullptr;
1259  for (auto *D : Decls) {
1260  if (FieldsAlreadyLoaded && isa<FieldDecl>(D))
1261  continue;
1262 
1263  if (PrevDecl)
1264  PrevDecl->NextInContextAndBits.setPointer(D);
1265  else
1266  FirstNewDecl = D;
1267 
1268  PrevDecl = D;
1269  }
1270 
1271  return std::make_pair(FirstNewDecl, PrevDecl);
1272 }
1273 
1274 /// We have just acquired external visible storage, and we already have
1275 /// built a lookup map. For every name in the map, pull in the new names from
1276 /// the external storage.
1277 void DeclContext::reconcileExternalVisibleStorage() const {
1278  assert(hasNeedToReconcileExternalVisibleStorage() && LookupPtr);
1279  setNeedToReconcileExternalVisibleStorage(false);
1280 
1281  for (auto &Lookup : *LookupPtr)
1282  Lookup.second.setHasExternalDecls();
1283 }
1284 
1285 /// Load the declarations within this lexical storage from an
1286 /// external source.
1287 /// \return \c true if any declarations were added.
1288 bool
1289 DeclContext::LoadLexicalDeclsFromExternalStorage() const {
1290  ExternalASTSource *Source = getParentASTContext().getExternalSource();
1291  assert(hasExternalLexicalStorage() && Source && "No external storage?");
1292 
1293  // Notify that we have a DeclContext that is initializing.
1294  ExternalASTSource::Deserializing ADeclContext(Source);
1295 
1296  // Load the external declarations, if any.
1297  SmallVector<Decl*, 64> Decls;
1298  setHasExternalLexicalStorage(false);
1299  Source->FindExternalLexicalDecls(this, Decls);
1300 
1301  if (Decls.empty())
1302  return false;
1303 
1304  // We may have already loaded just the fields of this record, in which case
1305  // we need to ignore them.
1306  bool FieldsAlreadyLoaded = false;
1307  if (const auto *RD = dyn_cast<RecordDecl>(this))
1308  FieldsAlreadyLoaded = RD->hasLoadedFieldsFromExternalStorage();
1309 
1310  // Splice the newly-read declarations into the beginning of the list
1311  // of declarations.
1312  Decl *ExternalFirst, *ExternalLast;
1313  std::tie(ExternalFirst, ExternalLast) =
1314  BuildDeclChain(Decls, FieldsAlreadyLoaded);
1315  ExternalLast->NextInContextAndBits.setPointer(FirstDecl);
1316  FirstDecl = ExternalFirst;
1317  if (!LastDecl)
1318  LastDecl = ExternalLast;
1319  return true;
1320 }
1321 
1324  DeclarationName Name) {
1325  ASTContext &Context = DC->getParentASTContext();
1326  StoredDeclsMap *Map;
1327  if (!(Map = DC->LookupPtr))
1328  Map = DC->CreateStoredDeclsMap(Context);
1329  if (DC->hasNeedToReconcileExternalVisibleStorage())
1330  DC->reconcileExternalVisibleStorage();
1331 
1332  (*Map)[Name].removeExternalDecls();
1333 
1334  return DeclContext::lookup_result();
1335 }
1336 
1339  DeclarationName Name,
1340  ArrayRef<NamedDecl*> Decls) {
1341  ASTContext &Context = DC->getParentASTContext();
1342  StoredDeclsMap *Map;
1343  if (!(Map = DC->LookupPtr))
1344  Map = DC->CreateStoredDeclsMap(Context);
1345  if (DC->hasNeedToReconcileExternalVisibleStorage())
1346  DC->reconcileExternalVisibleStorage();
1347 
1348  StoredDeclsList &List = (*Map)[Name];
1349 
1350  // Clear out any old external visible declarations, to avoid quadratic
1351  // performance in the redeclaration checks below.
1352  List.removeExternalDecls();
1353 
1354  if (!List.isNull()) {
1355  // We have both existing declarations and new declarations for this name.
1356  // Some of the declarations may simply replace existing ones. Handle those
1357  // first.
1359  for (unsigned I = 0, N = Decls.size(); I != N; ++I)
1360  if (List.HandleRedeclaration(Decls[I], /*IsKnownNewer*/false))
1361  Skip.push_back(I);
1362  Skip.push_back(Decls.size());
1363 
1364  // Add in any new declarations.
1365  unsigned SkipPos = 0;
1366  for (unsigned I = 0, N = Decls.size(); I != N; ++I) {
1367  if (I == Skip[SkipPos])
1368  ++SkipPos;
1369  else
1370  List.AddSubsequentDecl(Decls[I]);
1371  }
1372  } else {
1373  // Convert the array to a StoredDeclsList.
1374  for (auto *D : Decls) {
1375  if (List.isNull())
1376  List.setOnlyValue(D);
1377  else
1378  List.AddSubsequentDecl(D);
1379  }
1380  }
1381 
1382  return List.getLookupResult();
1383 }
1384 
1386  if (hasExternalLexicalStorage())
1387  LoadLexicalDeclsFromExternalStorage();
1388  return decl_iterator(FirstDecl);
1389 }
1390 
1392  if (hasExternalLexicalStorage())
1393  LoadLexicalDeclsFromExternalStorage();
1394 
1395  return !FirstDecl;
1396 }
1397 
1399  return (D->getLexicalDeclContext() == this &&
1400  (D->NextInContextAndBits.getPointer() || D == LastDecl));
1401 }
1402 
1404  if (hasExternalLexicalStorage())
1405  LoadLexicalDeclsFromExternalStorage();
1406  return containsDecl(D);
1407 }
1408 
1409 /// shouldBeHidden - Determine whether a declaration which was declared
1410 /// within its semantic context should be invisible to qualified name lookup.
1411 static bool shouldBeHidden(NamedDecl *D) {
1412  // Skip unnamed declarations.
1413  if (!D->getDeclName())
1414  return true;
1415 
1416  // Skip entities that can't be found by name lookup into a particular
1417  // context.
1418  if ((D->getIdentifierNamespace() == 0 && !isa<UsingDirectiveDecl>(D)) ||
1419  D->isTemplateParameter())
1420  return true;
1421 
1422  // Skip friends and local extern declarations unless they're the first
1423  // declaration of the entity.
1424  if ((D->isLocalExternDecl() || D->getFriendObjectKind()) &&
1425  D != D->getCanonicalDecl())
1426  return true;
1427 
1428  // Skip template specializations.
1429  // FIXME: This feels like a hack. Should DeclarationName support
1430  // template-ids, or is there a better way to keep specializations
1431  // from being visible?
1432  if (isa<ClassTemplateSpecializationDecl>(D))
1433  return true;
1434  if (auto *FD = dyn_cast<FunctionDecl>(D))
1435  if (FD->isFunctionTemplateSpecialization())
1436  return true;
1437 
1438  return false;
1439 }
1440 
1442  assert(D->getLexicalDeclContext() == this &&
1443  "decl being removed from non-lexical context");
1444  assert((D->NextInContextAndBits.getPointer() || D == LastDecl) &&
1445  "decl is not in decls list");
1446 
1447  // Remove D from the decl chain. This is O(n) but hopefully rare.
1448  if (D == FirstDecl) {
1449  if (D == LastDecl)
1450  FirstDecl = LastDecl = nullptr;
1451  else
1452  FirstDecl = D->NextInContextAndBits.getPointer();
1453  } else {
1454  for (Decl *I = FirstDecl; true; I = I->NextInContextAndBits.getPointer()) {
1455  assert(I && "decl not found in linked list");
1456  if (I->NextInContextAndBits.getPointer() == D) {
1457  I->NextInContextAndBits.setPointer(D->NextInContextAndBits.getPointer());
1458  if (D == LastDecl) LastDecl = I;
1459  break;
1460  }
1461  }
1462  }
1463 
1464  // Mark that D is no longer in the decl chain.
1465  D->NextInContextAndBits.setPointer(nullptr);
1466 
1467  // Remove D from the lookup table if necessary.
1468  if (isa<NamedDecl>(D)) {
1469  auto *ND = cast<NamedDecl>(D);
1470 
1471  // Do not try to remove the declaration if that is invisible to qualified
1472  // lookup. E.g. template specializations are skipped.
1473  if (shouldBeHidden(ND))
1474  return;
1475 
1476  // Remove only decls that have a name
1477  if (!ND->getDeclName())
1478  return;
1479 
1480  auto *DC = D->getDeclContext();
1481  do {
1482  StoredDeclsMap *Map = DC->getPrimaryContext()->LookupPtr;
1483  if (Map) {
1484  StoredDeclsMap::iterator Pos = Map->find(ND->getDeclName());
1485  assert(Pos != Map->end() && "no lookup entry for decl");
1486  // Remove the decl only if it is contained.
1487  StoredDeclsList::DeclsTy *Vec = Pos->second.getAsVector();
1488  if ((Vec && is_contained(*Vec, ND)) || Pos->second.getAsDecl() == ND)
1489  Pos->second.remove(ND);
1490  }
1491  } while (DC->isTransparentContext() && (DC = DC->getParent()));
1492  }
1493 }
1494 
1496  assert(D->getLexicalDeclContext() == this &&
1497  "Decl inserted into wrong lexical context");
1498  assert(!D->getNextDeclInContext() && D != LastDecl &&
1499  "Decl already inserted into a DeclContext");
1500 
1501  if (FirstDecl) {
1502  LastDecl->NextInContextAndBits.setPointer(D);
1503  LastDecl = D;
1504  } else {
1505  FirstDecl = LastDecl = D;
1506  }
1507 
1508  // Notify a C++ record declaration that we've added a member, so it can
1509  // update its class-specific state.
1510  if (auto *Record = dyn_cast<CXXRecordDecl>(this))
1511  Record->addedMember(D);
1512 
1513  // If this is a newly-created (not de-serialized) import declaration, wire
1514  // it in to the list of local import declarations.
1515  if (!D->isFromASTFile()) {
1516  if (auto *Import = dyn_cast<ImportDecl>(D))
1517  D->getASTContext().addedLocalImportDecl(Import);
1518  }
1519 }
1520 
1522  addHiddenDecl(D);
1523 
1524  if (auto *ND = dyn_cast<NamedDecl>(D))
1525  ND->getDeclContext()->getPrimaryContext()->
1526  makeDeclVisibleInContextWithFlags(ND, false, true);
1527 }
1528 
1530  addHiddenDecl(D);
1531 
1532  if (auto *ND = dyn_cast<NamedDecl>(D))
1533  ND->getDeclContext()->getPrimaryContext()->
1534  makeDeclVisibleInContextWithFlags(ND, true, true);
1535 }
1536 
1537 /// buildLookup - Build the lookup data structure with all of the
1538 /// declarations in this DeclContext (and any other contexts linked
1539 /// to it or transparent contexts nested within it) and return it.
1540 ///
1541 /// Note that the produced map may miss out declarations from an
1542 /// external source. If it does, those entries will be marked with
1543 /// the 'hasExternalDecls' flag.
1545  assert(this == getPrimaryContext() && "buildLookup called on non-primary DC");
1546 
1547  if (!hasLazyLocalLexicalLookups() &&
1548  !hasLazyExternalLexicalLookups())
1549  return LookupPtr;
1550 
1552  collectAllContexts(Contexts);
1553 
1554  if (hasLazyExternalLexicalLookups()) {
1555  setHasLazyExternalLexicalLookups(false);
1556  for (auto *DC : Contexts) {
1557  if (DC->hasExternalLexicalStorage()) {
1558  bool LoadedDecls = DC->LoadLexicalDeclsFromExternalStorage();
1559  setHasLazyLocalLexicalLookups(
1560  hasLazyLocalLexicalLookups() | LoadedDecls );
1561  }
1562  }
1563 
1564  if (!hasLazyLocalLexicalLookups())
1565  return LookupPtr;
1566  }
1567 
1568  for (auto *DC : Contexts)
1569  buildLookupImpl(DC, hasExternalVisibleStorage());
1570 
1571  // We no longer have any lazy decls.
1572  setHasLazyLocalLexicalLookups(false);
1573  return LookupPtr;
1574 }
1575 
1576 /// buildLookupImpl - Build part of the lookup data structure for the
1577 /// declarations contained within DCtx, which will either be this
1578 /// DeclContext, a DeclContext linked to it, or a transparent context
1579 /// nested within it.
1580 void DeclContext::buildLookupImpl(DeclContext *DCtx, bool Internal) {
1581  for (auto *D : DCtx->noload_decls()) {
1582  // Insert this declaration into the lookup structure, but only if
1583  // it's semantically within its decl context. Any other decls which
1584  // should be found in this context are added eagerly.
1585  //
1586  // If it's from an AST file, don't add it now. It'll get handled by
1587  // FindExternalVisibleDeclsByName if needed. Exception: if we're not
1588  // in C++, we do not track external visible decls for the TU, so in
1589  // that case we need to collect them all here.
1590  if (auto *ND = dyn_cast<NamedDecl>(D))
1591  if (ND->getDeclContext() == DCtx && !shouldBeHidden(ND) &&
1592  (!ND->isFromASTFile() ||
1593  (isTranslationUnit() &&
1594  !getParentASTContext().getLangOpts().CPlusPlus)))
1595  makeDeclVisibleInContextImpl(ND, Internal);
1596 
1597  // If this declaration is itself a transparent declaration context
1598  // or inline namespace, add the members of this declaration of that
1599  // context (recursively).
1600  if (auto *InnerCtx = dyn_cast<DeclContext>(D))
1601  if (InnerCtx->isTransparentContext() || InnerCtx->isInlineNamespace())
1602  buildLookupImpl(InnerCtx, Internal);
1603  }
1604 }
1605 
1606 NamedDecl *const DeclContextLookupResult::SingleElementDummyList = nullptr;
1607 
1610  assert(getDeclKind() != Decl::LinkageSpec &&
1611  getDeclKind() != Decl::Export &&
1612  "should not perform lookups into transparent contexts");
1613 
1614  const DeclContext *PrimaryContext = getPrimaryContext();
1615  if (PrimaryContext != this)
1616  return PrimaryContext->lookup(Name);
1617 
1618  // If we have an external source, ensure that any later redeclarations of this
1619  // context have been loaded, since they may add names to the result of this
1620  // lookup (or add external visible storage).
1621  ExternalASTSource *Source = getParentASTContext().getExternalSource();
1622  if (Source)
1623  (void)cast<Decl>(this)->getMostRecentDecl();
1624 
1625  if (hasExternalVisibleStorage()) {
1626  assert(Source && "external visible storage but no external source?");
1627 
1628  if (hasNeedToReconcileExternalVisibleStorage())
1629  reconcileExternalVisibleStorage();
1630 
1631  StoredDeclsMap *Map = LookupPtr;
1632 
1633  if (hasLazyLocalLexicalLookups() ||
1634  hasLazyExternalLexicalLookups())
1635  // FIXME: Make buildLookup const?
1636  Map = const_cast<DeclContext*>(this)->buildLookup();
1637 
1638  if (!Map)
1639  Map = CreateStoredDeclsMap(getParentASTContext());
1640 
1641  // If we have a lookup result with no external decls, we are done.
1642  std::pair<StoredDeclsMap::iterator, bool> R =
1643  Map->insert(std::make_pair(Name, StoredDeclsList()));
1644  if (!R.second && !R.first->second.hasExternalDecls())
1645  return R.first->second.getLookupResult();
1646 
1647  if (Source->FindExternalVisibleDeclsByName(this, Name) || !R.second) {
1648  if (StoredDeclsMap *Map = LookupPtr) {
1649  StoredDeclsMap::iterator I = Map->find(Name);
1650  if (I != Map->end())
1651  return I->second.getLookupResult();
1652  }
1653  }
1654 
1655  return {};
1656  }
1657 
1658  StoredDeclsMap *Map = LookupPtr;
1659  if (hasLazyLocalLexicalLookups() ||
1660  hasLazyExternalLexicalLookups())
1661  Map = const_cast<DeclContext*>(this)->buildLookup();
1662 
1663  if (!Map)
1664  return {};
1665 
1666  StoredDeclsMap::iterator I = Map->find(Name);
1667  if (I == Map->end())
1668  return {};
1669 
1670  return I->second.getLookupResult();
1671 }
1672 
1675  assert(getDeclKind() != Decl::LinkageSpec &&
1676  getDeclKind() != Decl::Export &&
1677  "should not perform lookups into transparent contexts");
1678 
1679  DeclContext *PrimaryContext = getPrimaryContext();
1680  if (PrimaryContext != this)
1681  return PrimaryContext->noload_lookup(Name);
1682 
1683  loadLazyLocalLexicalLookups();
1684  StoredDeclsMap *Map = LookupPtr;
1685  if (!Map)
1686  return {};
1687 
1688  StoredDeclsMap::iterator I = Map->find(Name);
1689  return I != Map->end() ? I->second.getLookupResult()
1690  : lookup_result();
1691 }
1692 
1693 // If we have any lazy lexical declarations not in our lookup map, add them
1694 // now. Don't import any external declarations, not even if we know we have
1695 // some missing from the external visible lookups.
1696 void DeclContext::loadLazyLocalLexicalLookups() {
1697  if (hasLazyLocalLexicalLookups()) {
1699  collectAllContexts(Contexts);
1700  for (auto *Context : Contexts)
1701  buildLookupImpl(Context, hasExternalVisibleStorage());
1702  setHasLazyLocalLexicalLookups(false);
1703  }
1704 }
1705 
1707  SmallVectorImpl<NamedDecl *> &Results) {
1708  Results.clear();
1709 
1710  // If there's no external storage, just perform a normal lookup and copy
1711  // the results.
1712  if (!hasExternalVisibleStorage() && !hasExternalLexicalStorage() && Name) {
1713  lookup_result LookupResults = lookup(Name);
1714  Results.insert(Results.end(), LookupResults.begin(), LookupResults.end());
1715  return;
1716  }
1717 
1718  // If we have a lookup table, check there first. Maybe we'll get lucky.
1719  // FIXME: Should we be checking these flags on the primary context?
1720  if (Name && !hasLazyLocalLexicalLookups() &&
1721  !hasLazyExternalLexicalLookups()) {
1722  if (StoredDeclsMap *Map = LookupPtr) {
1723  StoredDeclsMap::iterator Pos = Map->find(Name);
1724  if (Pos != Map->end()) {
1725  Results.insert(Results.end(),
1726  Pos->second.getLookupResult().begin(),
1727  Pos->second.getLookupResult().end());
1728  return;
1729  }
1730  }
1731  }
1732 
1733  // Slow case: grovel through the declarations in our chain looking for
1734  // matches.
1735  // FIXME: If we have lazy external declarations, this will not find them!
1736  // FIXME: Should we CollectAllContexts and walk them all here?
1737  for (Decl *D = FirstDecl; D; D = D->getNextDeclInContext()) {
1738  if (auto *ND = dyn_cast<NamedDecl>(D))
1739  if (ND->getDeclName() == Name)
1740  Results.push_back(ND);
1741  }
1742 }
1743 
1745  DeclContext *Ctx = this;
1746 
1747  // In C, a record type is the redeclaration context for its fields only. If
1748  // we arrive at a record context after skipping anything else, we should skip
1749  // the record as well. Currently, this means skipping enumerations because
1750  // they're the only transparent context that can exist within a struct or
1751  // union.
1752  bool SkipRecords = getDeclKind() == Decl::Kind::Enum &&
1753  !getParentASTContext().getLangOpts().CPlusPlus;
1754 
1755  // Skip through contexts to get to the redeclaration context. Transparent
1756  // contexts are always skipped.
1757  while ((SkipRecords && Ctx->isRecord()) || Ctx->isTransparentContext())
1758  Ctx = Ctx->getParent();
1759  return Ctx;
1760 }
1761 
1763  DeclContext *Ctx = this;
1764  // Skip through non-namespace, non-translation-unit contexts.
1765  while (!Ctx->isFileContext())
1766  Ctx = Ctx->getParent();
1767  return Ctx->getPrimaryContext();
1768 }
1769 
1771  // Loop until we find a non-record context.
1772  RecordDecl *OutermostRD = nullptr;
1773  DeclContext *DC = this;
1774  while (DC->isRecord()) {
1775  OutermostRD = cast<RecordDecl>(DC);
1776  DC = DC->getLexicalParent();
1777  }
1778  return OutermostRD;
1779 }
1780 
1782  // For non-file contexts, this is equivalent to Equals.
1783  if (!isFileContext())
1784  return O->Equals(this);
1785 
1786  do {
1787  if (O->Equals(this))
1788  return true;
1789 
1790  const auto *NS = dyn_cast<NamespaceDecl>(O);
1791  if (!NS || !NS->isInline())
1792  break;
1793  O = NS->getParent();
1794  } while (O);
1795 
1796  return false;
1797 }
1798 
1800  DeclContext *PrimaryDC = this->getPrimaryContext();
1801  DeclContext *DeclDC = D->getDeclContext()->getPrimaryContext();
1802  // If the decl is being added outside of its semantic decl context, we
1803  // need to ensure that we eagerly build the lookup information for it.
1804  PrimaryDC->makeDeclVisibleInContextWithFlags(D, false, PrimaryDC == DeclDC);
1805 }
1806 
1807 void DeclContext::makeDeclVisibleInContextWithFlags(NamedDecl *D, bool Internal,
1808  bool Recoverable) {
1809  assert(this == getPrimaryContext() && "expected a primary DC");
1810 
1811  if (!isLookupContext()) {
1812  if (isTransparentContext())
1813  getParent()->getPrimaryContext()
1814  ->makeDeclVisibleInContextWithFlags(D, Internal, Recoverable);
1815  return;
1816  }
1817 
1818  // Skip declarations which should be invisible to name lookup.
1819  if (shouldBeHidden(D))
1820  return;
1821 
1822  // If we already have a lookup data structure, perform the insertion into
1823  // it. If we might have externally-stored decls with this name, look them
1824  // up and perform the insertion. If this decl was declared outside its
1825  // semantic context, buildLookup won't add it, so add it now.
1826  //
1827  // FIXME: As a performance hack, don't add such decls into the translation
1828  // unit unless we're in C++, since qualified lookup into the TU is never
1829  // performed.
1830  if (LookupPtr || hasExternalVisibleStorage() ||
1831  ((!Recoverable || D->getDeclContext() != D->getLexicalDeclContext()) &&
1832  (getParentASTContext().getLangOpts().CPlusPlus ||
1833  !isTranslationUnit()))) {
1834  // If we have lazily omitted any decls, they might have the same name as
1835  // the decl which we are adding, so build a full lookup table before adding
1836  // this decl.
1837  buildLookup();
1838  makeDeclVisibleInContextImpl(D, Internal);
1839  } else {
1840  setHasLazyLocalLexicalLookups(true);
1841  }
1842 
1843  // If we are a transparent context or inline namespace, insert into our
1844  // parent context, too. This operation is recursive.
1845  if (isTransparentContext() || isInlineNamespace())
1846  getParent()->getPrimaryContext()->
1847  makeDeclVisibleInContextWithFlags(D, Internal, Recoverable);
1848 
1849  auto *DCAsDecl = cast<Decl>(this);
1850  // Notify that a decl was made visible unless we are a Tag being defined.
1851  if (!(isa<TagDecl>(DCAsDecl) && cast<TagDecl>(DCAsDecl)->isBeingDefined()))
1852  if (ASTMutationListener *L = DCAsDecl->getASTMutationListener())
1853  L->AddedVisibleDecl(this, D);
1854 }
1855 
1856 void DeclContext::makeDeclVisibleInContextImpl(NamedDecl *D, bool Internal) {
1857  // Find or create the stored declaration map.
1858  StoredDeclsMap *Map = LookupPtr;
1859  if (!Map) {
1860  ASTContext *C = &getParentASTContext();
1861  Map = CreateStoredDeclsMap(*C);
1862  }
1863 
1864  // If there is an external AST source, load any declarations it knows about
1865  // with this declaration's name.
1866  // If the lookup table contains an entry about this name it means that we
1867  // have already checked the external source.
1868  if (!Internal)
1869  if (ExternalASTSource *Source = getParentASTContext().getExternalSource())
1870  if (hasExternalVisibleStorage() &&
1871  Map->find(D->getDeclName()) == Map->end())
1872  Source->FindExternalVisibleDeclsByName(this, D->getDeclName());
1873 
1874  // Insert this declaration into the map.
1875  StoredDeclsList &DeclNameEntries = (*Map)[D->getDeclName()];
1876 
1877  if (Internal) {
1878  // If this is being added as part of loading an external declaration,
1879  // this may not be the only external declaration with this name.
1880  // In this case, we never try to replace an existing declaration; we'll
1881  // handle that when we finalize the list of declarations for this name.
1882  DeclNameEntries.setHasExternalDecls();
1883  DeclNameEntries.AddSubsequentDecl(D);
1884  return;
1885  }
1886 
1887  if (DeclNameEntries.isNull()) {
1888  DeclNameEntries.setOnlyValue(D);
1889  return;
1890  }
1891 
1892  if (DeclNameEntries.HandleRedeclaration(D, /*IsKnownNewer*/!Internal)) {
1893  // This declaration has replaced an existing one for which
1894  // declarationReplaces returns true.
1895  return;
1896  }
1897 
1898  // Put this declaration into the appropriate slot.
1899  DeclNameEntries.AddSubsequentDecl(D);
1900 }
1901 
1903  return cast<UsingDirectiveDecl>(*I);
1904 }
1905 
1906 /// Returns iterator range [First, Last) of UsingDirectiveDecls stored within
1907 /// this context.
1909  // FIXME: Use something more efficient than normal lookup for using
1910  // directives. In C++, using directives are looked up more than anything else.
1911  lookup_result Result = lookup(UsingDirectiveDecl::getName());
1912  return udir_range(Result.begin(), Result.end());
1913 }
1914 
1915 //===----------------------------------------------------------------------===//
1916 // Creation and Destruction of StoredDeclsMaps. //
1917 //===----------------------------------------------------------------------===//
1918 
1919 StoredDeclsMap *DeclContext::CreateStoredDeclsMap(ASTContext &C) const {
1920  assert(!LookupPtr && "context already has a decls map");
1921  assert(getPrimaryContext() == this &&
1922  "creating decls map on non-primary context");
1923 
1924  StoredDeclsMap *M;
1925  bool Dependent = isDependentContext();
1926  if (Dependent)
1927  M = new DependentStoredDeclsMap();
1928  else
1929  M = new StoredDeclsMap();
1930  M->Previous = C.LastSDM;
1931  C.LastSDM = llvm::PointerIntPair<StoredDeclsMap*,1>(M, Dependent);
1932  LookupPtr = M;
1933  return M;
1934 }
1935 
1936 void ASTContext::ReleaseDeclContextMaps() {
1937  // It's okay to delete DependentStoredDeclsMaps via a StoredDeclsMap
1938  // pointer because the subclass doesn't add anything that needs to
1939  // be deleted.
1940  StoredDeclsMap::DestroyAll(LastSDM.getPointer(), LastSDM.getInt());
1941 }
1942 
1943 void StoredDeclsMap::DestroyAll(StoredDeclsMap *Map, bool Dependent) {
1944  while (Map) {
1945  // Advance the iteration before we invalidate memory.
1946  llvm::PointerIntPair<StoredDeclsMap*,1> Next = Map->Previous;
1947 
1948  if (Dependent)
1949  delete static_cast<DependentStoredDeclsMap*>(Map);
1950  else
1951  delete Map;
1952 
1953  Map = Next.getPointer();
1954  Dependent = Next.getInt();
1955  }
1956 }
1957 
1960  const PartialDiagnostic &PDiag) {
1961  assert(Parent->isDependentContext()
1962  && "cannot iterate dependent diagnostics of non-dependent context");
1963  Parent = Parent->getPrimaryContext();
1964  if (!Parent->LookupPtr)
1965  Parent->CreateStoredDeclsMap(C);
1966 
1967  auto *Map = static_cast<DependentStoredDeclsMap *>(Parent->LookupPtr);
1968 
1969  // Allocate the copy of the PartialDiagnostic via the ASTContext's
1970  // BumpPtrAllocator, rather than the ASTContext itself.
1971  PartialDiagnostic::Storage *DiagStorage = nullptr;
1972  if (PDiag.hasStorage())
1973  DiagStorage = new (C) PartialDiagnostic::Storage;
1974 
1975  auto *DD = new (C) DependentDiagnostic(PDiag, DiagStorage);
1976 
1977  // TODO: Maybe we shouldn't reverse the order during insertion.
1978  DD->NextDiagnostic = Map->FirstDiagnostic;
1979  Map->FirstDiagnostic = DD;
1980 
1981  return DD;
1982 }
static StringRef getRealizedPlatform(const AvailabilityAttr *A, const ASTContext &Context)
Definition: DeclBase.cpp:468
Defines the clang::ASTContext interface.
Represents a function declaration or definition.
Definition: Decl.h:1784
AttrVec & getDeclAttrs(const Decl *D)
Retrieve the attributes for the given declaration.
void localUncachedLookup(DeclarationName Name, SmallVectorImpl< NamedDecl *> &Results)
A simplistic name lookup mechanism that performs name lookup into this declaration context without co...
Definition: DeclBase.cpp:1706
VersionTuple getPlatformMinVersion() const
Retrieve the minimum desired version of the platform, to which the program should be compiled...
Definition: TargetInfo.h:1253
static DeclContext * castToDeclContext(const Decl *)
Definition: DeclBase.cpp:877
Module * getOwningModule() const
Get the module that owns this declaration (for visibility purposes).
Definition: DeclBase.h:759
PointerType - C99 6.7.5.1 - Pointer Declarators.
Definition: Type.h:2585
QualType getPointeeType() const
Definition: Type.h:2598
static bool shouldBeHidden(NamedDecl *D)
shouldBeHidden - Determine whether a declaration which was declared within its semantic context shoul...
Definition: DeclBase.cpp:1411
A (possibly-)qualified type.
Definition: Type.h:643
bool isBlockPointerType() const
Definition: Type.h:6399
TagDecl * getDefinition() const
Returns the TagDecl that actually defines this struct/union/class/enum.
Definition: Decl.cpp:4095
const char * getDeclKindName() const
Definition: DeclBase.cpp:123
llvm::PointerIntPair< Decl *, 2, ModuleOwnershipKind > NextInContextAndBits
The next declaration within the same lexical DeclContext.
Definition: DeclBase.h:244
void AddSubsequentDecl(NamedDecl *D)
AddSubsequentDecl - This is called on the second and later decl when it is not a redeclaration to mer...
virtual void FindExternalLexicalDecls(const DeclContext *DC, llvm::function_ref< bool(Decl::Kind)> IsKindWeWant, SmallVectorImpl< Decl *> &Result)
Finds all declarations lexically contained within the given DeclContext, after applying an optional f...
RAII class for safely pairing a StartedDeserializing call with FinishedDeserializing.
static Decl * castFromDeclContext(const DeclContext *)
Definition: DeclBase.cpp:858
bool isClosure() const
Definition: DeclBase.h:1812
virtual Stmt * getBody() const
getBody - If this Decl represents a declaration for a body of code, such as a function or method defi...
Definition: DeclBase.h:986
void setAttrs(const AttrVec &Attrs)
Definition: DeclBase.h:486
static bool isLinkageSpecContext(const DeclContext *DC, LinkageSpecDecl::LanguageIDs ID)
Definition: DeclBase.cpp:1130
Stmt - This represents one statement.
Definition: Stmt.h:66
FunctionType - C99 6.7.5.3 - Function Declarators.
Definition: Type.h:3393
C Language Family Type Representation.
const char * getDeclKindName() const
Definition: DeclBase.cpp:155
Decl - This represents one declaration (or definition), e.g.
Definition: DeclBase.h:88
specific_attr_iterator - Iterates over a subrange of an AttrVec, only providing attributes that are o...
Definition: AttrIterator.h:34
static void add(Kind k)
Definition: DeclBase.cpp:193
Defines the C++ template declaration subclasses.
Decl * getPreviousDecl()
Retrieve the previous declaration that declares the same entity as this declaration, or NULL if there is no previous declaration.
Definition: DeclBase.h:960
Defines types useful for describing an Objective-C runtime.
Represent a C++ namespace.
Definition: Decl.h:522
const TargetInfo & getTargetInfo() const
Definition: ASTContext.h:706
unsigned getIdentifierNamespace() const
Definition: DeclBase.h:799
static Decl * getNonClosureContext(T *D)
Starting at a given context (a Decl or DeclContext), look for a code context that is not a closure (a...
Definition: DeclBase.cpp:973
const DeclContext * getParentFunctionOrMethod() const
If this decl is defined inside a function/method/block it returns the corresponding DeclContext...
Definition: DeclBase.cpp:254
unsigned Access
Access - Used by C++ decls for the access specifier.
Definition: DeclBase.h:325
bool HandleRedeclaration(NamedDecl *D, bool IsKnownNewer)
HandleRedeclaration - If this is a redeclaration of an existing decl, replace the old one with D and ...
This file provides some common utility functions for processing Lambda related AST Constructs...
bool hasOwningModule() const
Is this declaration owned by some module?
Definition: DeclBase.h:754
ASTMutationListener * getASTMutationListener() const
Definition: DeclBase.cpp:381
const T * getAs() const
Member-template getAs<specific type>&#39;.
Definition: Type.h:6858
bool hasLocalOwningModuleStorage() const
Definition: DeclBase.cpp:119
bool isExternCContext() const
Determines whether this context or some of its ancestors is a linkage specification context that spec...
Definition: DeclBase.cpp:1140
bool isInvalidDecl() const
Definition: DeclBase.h:553
ExternalSourceSymbolAttr * getExternalSourceSymbolAttr() const
Looks on this and related declarations for an applicable external source symbol attribute.
Definition: DeclBase.cpp:435
bool isParameterPack() const
Whether this declaration is a parameter pack.
Definition: DeclBase.cpp:211
void removeDecl(Decl *D)
Removes a declaration from this context.
Definition: DeclBase.cpp:1441
bool hasWeakClassImport() const
Does this runtime support weakly importing classes?
Definition: ObjCRuntime.h:361
Types, declared with &#39;struct foo&#39;, typedefs, etc.
Definition: DeclBase.h:132
bool isLexicallyWithinFunctionOrMethod() const
Returns true if this declaration lexically is inside a function.
Definition: DeclBase.cpp:335
Represents a struct/union/class.
Definition: Decl.h:3662
DeclarationName getDeclName() const
Get the actual, stored name of the declaration, which may be a special name.
Definition: Decl.h:297
bool Encloses(const DeclContext *DC) const
Determine whether this declaration context encloses the declaration context DC.
Definition: DeclBase.cpp:1159
One of these records is kept for each identifier that is lexed.
bool isInAnonymousNamespace() const
Definition: DeclBase.cpp:347
bool isStr(const char(&Str)[StrLen]) const
Return true if this is the identifier for the specified string.
static DeclContextLookupResult SetExternalVisibleDeclsForName(const DeclContext *DC, DeclarationName Name, ArrayRef< NamedDecl *> Decls)
Definition: DeclBase.cpp:1338
QualType getPointeeType() const
Definition: Type.h:2702
void print(raw_ostream &OS, const SourceManager &SM) const
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:160
The results of name lookup within a DeclContext.
Definition: DeclBase.h:1195
__SIZE_TYPE__ size_t
The unsigned integer type of the result of the sizeof operator.
Definition: opencl-c-base.h:40
bool Equals(const DeclContext *DC) const
Determine whether this declaration context is equivalent to the declaration context DC...
Definition: DeclBase.h:1903
__DEVICE__ int max(int __a, int __b)
Describes a module or submodule.
Definition: Module.h:64
virtual void updateOutOfDateIdentifier(IdentifierInfo &II)
Update an out-of-date identifier.
DeclContext * getEnclosingNamespaceContext()
Retrieve the nearest enclosing namespace context.
Definition: DeclBase.cpp:1762
virtual bool FindExternalVisibleDeclsByName(const DeclContext *DC, DeclarationName Name)
Find all declarations with the given name in the given context, and add them to the context by callin...
Namespaces, declared with &#39;namespace foo {}&#39;.
Definition: DeclBase.h:142
bool isReferenced() const
Whether any declaration of this entity was referenced.
Definition: DeclBase.cpp:423
Forward-declares and imports various common LLVM datatypes that clang wants to use unqualified...
ModuleOwnershipKind getModuleOwnershipKind() const
Get the kind of module ownership for this declaration.
Definition: DeclBase.h:786
StoredDeclsMap * buildLookup()
Ensure the lookup structure is fully-built and return it.
Definition: DeclBase.cpp:1544
static DeclContextLookupResult SetNoExternalVisibleDeclsForName(const DeclContext *DC, DeclarationName Name)
Definition: DeclBase.cpp:1323
ASTContext & getASTContext() const
Definition: Decl.h:119
void eraseDeclAttrs(const Decl *D)
Erase the attributes corresponding to the given declaration.
DeclContext * getLexicalDeclContext()
getLexicalDeclContext - The declaration context where this Decl was lexically declared (LexicalDC)...
Definition: DeclBase.h:828
Labels, declared with &#39;x:&#39; and referenced with &#39;goto x&#39;.
Definition: DeclBase.h:119
void setLocalOwningModule(Module *M)
Definition: DeclBase.h:746
bool isLambdaCallOperator(const CXXMethodDecl *MD)
Definition: ASTLambda.h:27
Represents a linkage specification.
Definition: DeclCXX.h:2753
Ordinary names.
Definition: DeclBase.h:146
virtual Decl * getCanonicalDecl()
Retrieves the "canonical" declaration of the given declaration.
Definition: DeclBase.h:877
void addDeclInternal(Decl *D)
Add the declaration D into this context, but suppress searches for external declarations with the sam...
Definition: DeclBase.cpp:1529
lookup_result lookup(DeclarationName Name) const
lookup - Find the declarations (if any) with the given Name in this context.
Definition: DeclBase.cpp:1609
AvailabilityResult
Captures the result of checking the availability of a declaration.
Definition: DeclBase.h:74
NodeId Parent
Definition: ASTDiff.cpp:191
Decl * getNextDeclInContext()
Definition: DeclBase.h:435
bool canBeWeakImported(bool &IsDefinition) const
Determines whether this symbol can be weak-imported, e.g., whether it would be well-formed to add the...
Definition: DeclBase.cpp:640
udir_range using_directives() const
Returns iterator range [First, Last) of UsingDirectiveDecls stored within this context.
Definition: DeclBase.cpp:1908
AvailabilityResult getAvailability(std::string *Message=nullptr, VersionTuple EnclosingVersion=VersionTuple(), StringRef *RealizedPlatform=nullptr) const
Determine the availability of the given declaration.
Definition: DeclBase.cpp:574
Objective C @protocol.
Definition: DeclBase.h:149
llvm::iterator_range< udir_iterator > udir_range
Definition: DeclBase.h:2309
decl_range noload_decls() const
noload_decls_begin/end - Iterate over the declarations stored in this context that are currently load...
Definition: DeclBase.h:2036
const FunctionType * getFunctionType(bool BlocksToo=true) const
Looks through the Decl&#39;s underlying type to extract a FunctionType when possible. ...
Definition: DeclBase.cpp:952
void removeExternalDecls()
Remove any declarations which were imported from an external AST source.
int64_t getID() const
Definition: DeclBase.cpp:948
bool isInlineNamespace() const
Definition: DeclBase.cpp:1068
DeclContext * getLexicalParent()
getLexicalParent - Returns the containing lexical DeclContext.
Definition: DeclBase.h:1795
Represents a block literal declaration, which is like an unnamed FunctionDecl.
Definition: Decl.h:3951
const Attr * getDefiningAttr() const
Return this declaration&#39;s defining attribute if it has one.
Definition: DeclBase.cpp:460
Defines the clang::LangOptions interface.
QualType getPointeeType() const
Definition: Type.h:2742
std::string Label
static unsigned getIdentifierNamespaceForKind(Kind DK)
Definition: DeclBase.cpp:689
bool containsDecl(Decl *D) const
Checks whether a declaration is in this context.
Definition: DeclBase.cpp:1398
const T * castAs() const
Member-template castAs<specific type>.
Definition: Type.h:6923
#define V(N, I)
Definition: ASTContext.h:2921
bool isFunctionReferenceType() const
Definition: Type.h:6422
void setInvalidDecl(bool Invalid=true)
setInvalidDecl - Indicates the Decl had a semantic error.
Definition: DeclBase.cpp:132
This declaration is an OpenMP user defined reduction construction.
Definition: DeclBase.h:180
bool InEnclosingNamespaceSetOf(const DeclContext *NS) const
Test if this context is part of the enclosing namespace set of the context NS, as defined in C++0x [n...
Definition: DeclBase.cpp:1781
Decl * getMostRecentDecl()
Retrieve the most recent declaration that declares the same entity as this declaration (which may be ...
Definition: DeclBase.h:975
bool isLocalExternDecl()
Determine whether this is a block-scope declaration with linkage.
Definition: DeclBase.h:1060
bool isFileContext() const
Definition: DeclBase.h:1849
DeclContext * getDeclContext()
Definition: DeclBase.h:438
lookup_result noload_lookup(DeclarationName Name)
Find the declarations with the given name that are visible within this context; don&#39;t attempt to retr...
Definition: DeclBase.cpp:1674
Decl * getNonClosureAncestor()
Find the nearest non-closure ancestor of this context, i.e.
Definition: DeclBase.cpp:996
An abstract interface that should be implemented by listeners that want to be notified when an AST en...
bool isTemplateParameter() const
isTemplateParameter - Determines whether this declaration is a template parameter.
Definition: DeclBase.h:2453
bool isTemplateParameterPack() const
isTemplateParameter - Determines whether this declaration is a template parameter pack...
Definition: DeclBase.cpp:201
bool containsDeclAndLoad(Decl *D) const
Checks whether a declaration is in this context.
Definition: DeclBase.cpp:1403
This declaration is an OpenMP user defined mapper.
Definition: DeclBase.h:183
Defines the clang::IdentifierInfo, clang::IdentifierTable, and clang::Selector interfaces.
bool isFunctionOrMethod() const
Definition: DeclBase.h:1831
clang::ObjCRuntime ObjCRuntime
Definition: LangOptions.h:223
This declaration has an owning module, and is visible when that module is imported.
unsigned getMaxAlignment() const
getMaxAlignment - return the maximum alignment specified by attributes on this decl, 0 if there are none.
Definition: DeclBase.cpp:385
DeclContext * getParent()
getParent - Returns the containing DeclContext.
Definition: DeclBase.h:1779
void collectAllContexts(SmallVectorImpl< DeclContext *> &Contexts)
Collects all of the declaration contexts that are semantically connected to this declaration context...
Definition: DeclBase.cpp:1237
SourceLocation getEnd() const
bool isDependentContext() const
Determines whether this context is dependent on a template parameter.
Definition: DeclBase.cpp:1089
The result type of a method or function.
const SourceManager & SM
Definition: Format.cpp:1667
void setDeclContext(DeclContext *DC)
setDeclContext - Set both the semantic and lexical DeclContext to DC.
Definition: DeclBase.cpp:295
SmallVector< Attr *, 4 > AttrVec
AttrVec - A vector of Attr, which is how they are stored on the AST.
Definition: AttrIterator.h:29
FriendObjectKind getFriendObjectKind() const
Determines whether this declaration is the object of a friend declaration and, if so...
Definition: DeclBase.h:1111
virtual void DeclarationMarkedUsed(const Decl *D)
A declaration is marked used which was not previously marked used.
bool decls_empty() const
Definition: DeclBase.cpp:1391
AttrVec & getAttrs()
Definition: DeclBase.h:490
bool hasAttrs() const
Definition: DeclBase.h:484
Abstract interface for external sources of AST nodes.
bool isTemplateDecl() const
returns true if this declaration is a template
Definition: DeclBase.cpp:226
Decl::Kind getDeclKind() const
Definition: DeclBase.h:1772
void makeDeclVisibleInContext(NamedDecl *D)
Makes a declaration visible within this context.
Definition: DeclBase.cpp:1799
DeclContext::lookup_result getLookupResult()
getLookupResult - Return an array of all the decls that this list represents.
FunctionDecl * getAsFunction() LLVM_READONLY
Returns the function itself, or the templated function if this is a function template.
Definition: DeclBase.cpp:218
StringRef getPlatformName() const
Retrieve the name of the platform as it is used in the availability attribute.
Definition: TargetInfo.h:1249
VersionTuple getVersionIntroduced() const
Retrieve the version of the target platform in which this declaration was introduced.
Definition: DeclBase.cpp:626
Encodes a location in the source.
Members, declared with object declarations within tag definitions.
Definition: DeclBase.h:138
void setModuleOwnershipKind(ModuleOwnershipKind MOK)
Set whether this declaration is hidden from name lookup.
Definition: DeclBase.h:791
decl_iterator decls_begin() const
Definition: DeclBase.cpp:1385
Represents the declaration of a struct/union/class/enum.
Definition: Decl.h:3133
ASTContext & getASTContext() const LLVM_READONLY
Definition: DeclBase.cpp:377
bool isStdNamespace() const
Definition: DeclBase.cpp:1073
This file defines OpenMP nodes for declarative directives.
void print(raw_ostream &OS) const override
Definition: DeclBase.cpp:268
DeclContext(Decl::Kind K)
Definition: DeclBase.cpp:1004
bool isFromASTFile() const
Determine whether this declaration came from an AST file (such as a precompiled header or module) rat...
Definition: DeclBase.h:702
UsingDirectiveDecl * operator*() const
Definition: DeclBase.cpp:1902
bool isUsed(bool CheckUsedAttr=true) const
Whether any (re-)declaration of the entity was used, meaning that a definition is required...
Definition: DeclBase.cpp:398
An array of decls optimized for the common case of only containing one entry.
void dropAttrs()
Definition: DeclBase.cpp:823
bool isWeakImported() const
Determine whether this is a weak-imported symbol.
Definition: DeclBase.cpp:670
void * Allocate(size_t Size, unsigned Align=8) const
Definition: ASTContext.h:685
decl_iterator - Iterates through the declarations stored within this context.
Definition: DeclBase.h:1985
redecl_range redecls() const
Returns an iterator range for all the redeclarations of the same decl.
Definition: DeclBase.h:948
Dataflow Directional Tag Classes.
void updateOutOfDate(IdentifierInfo &II) const
Update a potentially out-of-date declaration.
Definition: DeclBase.cpp:63
bool isValid() const
Return true if this is a valid SourceLocation object.
virtual Module * getModule(unsigned ID)
Retrieve the module that corresponds to the given module ID.
DeclContext - This is used only as base class of specific decl types that can act as declaration cont...
Definition: DeclBase.h:1271
The base class of all kinds of template declarations (e.g., class, function, etc.).
Definition: DeclTemplate.h:387
bool isRecord() const
Definition: DeclBase.h:1858
attr_range attrs() const
Definition: DeclBase.h:501
RecordDecl * getOuterLexicalRecordContext()
Retrieve the outermost lexically enclosing record context.
Definition: DeclBase.cpp:1770
The name of a declaration.
Kind getKind() const
Definition: DeclBase.h:432
Decl * getNonClosureContext()
Find the innermost non-closure ancestor of this declaration, walking up through blocks, lambdas, etc.
Definition: DeclBase.cpp:992
Tags, declared with &#39;struct foo;&#39; and referenced with &#39;struct foo&#39;.
Definition: DeclBase.h:127
llvm::BumpPtrAllocator & getAllocator() const
Definition: ASTContext.h:681
ExternalASTSource * getExternalSource() const
Retrieve a pointer to the external AST source associated with this AST context, if any...
Definition: ASTContext.h:1085
A dependently-generated diagnostic.
Pointer to a block type.
Definition: Type.h:2687
static DependentDiagnostic * Create(ASTContext &Context, DeclContext *Parent, AccessNonce _, SourceLocation Loc, bool IsMemberAccess, AccessSpecifier AS, NamedDecl *TargetDecl, CXXRecordDecl *NamingClass, QualType BaseObjectType, const PartialDiagnostic &PDiag)
void setIsUsed()
Set whether the declaration is used, in the sense of odr-use.
Definition: DeclBase.h:573
LanguageIDs
Represents the language in a linkage specification.
Definition: DeclCXX.h:2764
T * getAttr() const
Definition: DeclBase.h:538
unsigned getOwningModuleID() const
Retrieve the global ID of the module that owns this particular declaration.
Definition: DeclBase.h:714
virtual ~Decl()
void setOnlyValue(NamedDecl *ND)
Base for LValueReferenceType and RValueReferenceType.
Definition: Type.h:2721
DeclContext * getRedeclContext()
getRedeclContext - Retrieve the context in which an entity conflicts with other entities of the same ...
Definition: DeclBase.cpp:1744
const LinkageSpecDecl * getExternCContext() const
Retrieve the nearest enclosing C linkage specification context.
Definition: DeclBase.cpp:1144
void addDecl(Decl *D)
Add the declaration D into this context.
Definition: DeclBase.cpp:1521
Implements a partial diagnostic that can be emitted anwyhere in a DiagnosticBuilder stream...
void markUsed(ASTContext &C)
Mark the declaration used, in the sense of odr-use.
Definition: DeclBase.cpp:413
ASTMutationListener * getASTMutationListener() const
Retrieve a pointer to the AST mutation listener associated with this AST context, if any...
Definition: ASTContext.h:1100
Defines the C++ Decl subclasses, other than those for templates (found in DeclTemplate.h) and friends (in DeclFriend.h).
Defines the clang::SourceLocation class and associated facilities.
DeclContextLookupResult lookup_result
Definition: DeclBase.h:2232
void addHiddenDecl(Decl *D)
Add the declaration D to this context without modifying any lookup tables.
Definition: DeclBase.cpp:1495
static std::pair< Decl *, Decl * > BuildDeclChain(ArrayRef< Decl *> Decls, bool FieldsAlreadyLoaded)
Build up a chain of declarations.
Definition: DeclBase.cpp:1254
bool isInherited() const
Definition: Attr.h:94
DeclContext * getLookupParent()
Find the parent context of this context that will be used for unqualified name lookup.
Definition: DeclBase.cpp:1040
void addAttr(Attr *A)
Definition: DeclBase.cpp:830
static bool classof(const Decl *D)
Definition: DeclBase.cpp:1014
Defines the clang::TargetInfo interface.
ASTContext & getParentASTContext() const
Definition: DeclBase.h:1808
SourceRange getSourceRange() const override LLVM_READONLY
Source range that this declaration covers.
Definition: Decl.cpp:3793
Kind
Lists the kind of concrete classes of Decl.
Definition: DeclBase.h:91
The top declaration context.
Definition: Decl.h:107
static void DestroyAll(StoredDeclsMap *Map, bool Dependent)
Definition: DeclBase.cpp:1943
static void PrintStats()
Definition: DeclBase.cpp:169
NamedDecl * getMostRecentDecl()
Definition: Decl.h:453
DeclContext * getPrimaryContext()
getPrimaryContext - There may be many different declarations of the same entity (including forward de...
Definition: DeclBase.cpp:1169
bool trackLocalOwningModule() const
Do we need to track the owning module for a local declaration?
Definition: LangOptions.h:284
static void EnableStatistics()
Definition: DeclBase.cpp:165
void setLexicalDeclContext(DeclContext *DC)
Definition: DeclBase.cpp:299
This represents a decl that may have a name.
Definition: Decl.h:248
bool isTranslationUnit() const
Definition: DeclBase.h:1854
void setAccess(AccessSpecifier AS)
Definition: DeclBase.h:468
TemplateDecl * getDescribedTemplate() const
If this is a declaration that describes some template, this method returns that template declaration...
Definition: DeclBase.cpp:230
Represents C++ using-directive.
Definition: DeclCXX.h:2845
bool hasDefiningAttr() const
Return true if this declaration has an attribute which acts as definition of the entity, such as &#39;alias&#39; or &#39;ifunc&#39;.
Definition: DeclBase.cpp:456
bool isFunctionPointerType() const
Definition: Type.h:6415
void addedLocalImportDecl(ImportDecl *Import)
Notify the AST context that a new import declaration has been parsed or implicitly created within thi...
bool isInStdNamespace() const
Definition: DeclBase.cpp:357
TranslationUnitDecl * getTranslationUnitDecl()
Definition: DeclBase.cpp:362
const LangOptions & getLangOpts() const
Definition: ASTContext.h:723
const BlockDecl * getInnermostBlockDecl() const
Return this DeclContext if it is a BlockDecl.
Definition: DeclBase.cpp:1056
bool isExternCXXContext() const
Determines whether this context or some of its ancestors is a linkage specification context that spec...
Definition: DeclBase.cpp:1155
bool isTemplated() const
Determine whether this declaration is a templated entity (whether it is.
Definition: DeclBase.cpp:243
SourceLocation getBodyRBrace() const
getBodyRBrace - Gets the right brace of the body, if a body exists.
Definition: DeclBase.cpp:896
Attr - This represents one attribute.
Definition: Attr.h:45
static AvailabilityResult CheckAvailability(ASTContext &Context, const AvailabilityAttr *A, std::string *Message, VersionTuple EnclosingVersion)
Determine the availability of the given declaration based on the target platform. ...
Definition: DeclBase.cpp:490
bool isBeingDefined() const
Return true if this decl is currently being defined.
Definition: Decl.h:3258
This declaration is a using declaration.
Definition: DeclBase.h:165
bool isTransparentContext() const
isTransparentContext - Determines whether this context is a "transparent" context, meaning that the members declared in this context are semantically declared in the nearest enclosing non-transparent (opaque) context but are lexically declared in this context.
Definition: DeclBase.cpp:1121