ASTReaderDecl.cpp revision 234982 
1//===--- ASTReaderDecl.cpp - Decl Deserialization ---------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements the ASTReader::ReadDeclRecord method, which is the
11// entrypoint for loading a decl.
12//
13//===----------------------------------------------------------------------===//
14
15#include "ASTCommon.h"
16#include "ASTReaderInternals.h"
17#include "clang/Serialization/ASTReader.h"
18#include "clang/Sema/IdentifierResolver.h"
19#include "clang/Sema/Sema.h"
20#include "clang/Sema/SemaDiagnostic.h"
21#include "clang/AST/ASTConsumer.h"
22#include "clang/AST/ASTContext.h"
23#include "clang/AST/DeclVisitor.h"
24#include "clang/AST/DeclGroup.h"
25#include "clang/AST/DeclCXX.h"
26#include "clang/AST/DeclTemplate.h"
27#include "clang/AST/Expr.h"
28using namespace clang;
29using namespace clang::serialization;
30
31//===----------------------------------------------------------------------===//
32// Declaration deserialization
33//===----------------------------------------------------------------------===//
34
35namespace clang {
36  class ASTDeclReader : public DeclVisitor<ASTDeclReader, void> {
37    ASTReader &Reader;
38    ModuleFile &F;
39    llvm::BitstreamCursor &Cursor;
40    const DeclID ThisDeclID;
41    const unsigned RawLocation;
42    typedef ASTReader::RecordData RecordData;
43    const RecordData &Record;
44    unsigned &Idx;
45    TypeID TypeIDForTypeDecl;
46
47    DeclID DeclContextIDForTemplateParmDecl;
48    DeclID LexicalDeclContextIDForTemplateParmDecl;
49
50    uint64_t GetCurrentCursorOffset();
51
52    SourceLocation ReadSourceLocation(const RecordData &R, unsigned &I) {
53      return Reader.ReadSourceLocation(F, R, I);
54    }
55
56    SourceRange ReadSourceRange(const RecordData &R, unsigned &I) {
57      return Reader.ReadSourceRange(F, R, I);
58    }
59
60    TypeSourceInfo *GetTypeSourceInfo(const RecordData &R, unsigned &I) {
61      return Reader.GetTypeSourceInfo(F, R, I);
62    }
63
64    serialization::DeclID ReadDeclID(const RecordData &R, unsigned &I) {
65      return Reader.ReadDeclID(F, R, I);
66    }
67
68    Decl *ReadDecl(const RecordData &R, unsigned &I) {
69      return Reader.ReadDecl(F, R, I);
70    }
71
72    template<typename T>
73    T *ReadDeclAs(const RecordData &R, unsigned &I) {
74      return Reader.ReadDeclAs<T>(F, R, I);
75    }
76
77    void ReadQualifierInfo(QualifierInfo &Info,
78                           const RecordData &R, unsigned &I) {
79      Reader.ReadQualifierInfo(F, Info, R, I);
80    }
81
82    void ReadDeclarationNameLoc(DeclarationNameLoc &DNLoc, DeclarationName Name,
83                                const RecordData &R, unsigned &I) {
84      Reader.ReadDeclarationNameLoc(F, DNLoc, Name, R, I);
85    }
86
87    void ReadDeclarationNameInfo(DeclarationNameInfo &NameInfo,
88                                const RecordData &R, unsigned &I) {
89      Reader.ReadDeclarationNameInfo(F, NameInfo, R, I);
90    }
91
92    serialization::SubmoduleID readSubmoduleID(const RecordData &R,
93                                               unsigned &I) {
94      if (I >= R.size())
95        return 0;
96
97      return Reader.getGlobalSubmoduleID(F, R[I++]);
98    }
99
100    Module *readModule(const RecordData &R, unsigned &I) {
101      return Reader.getSubmodule(readSubmoduleID(R, I));
102    }
103
104    void ReadCXXDefinitionData(struct CXXRecordDecl::DefinitionData &Data,
105                               const RecordData &R, unsigned &I);
106
107    /// \brief RAII class used to capture the first ID within a redeclaration
108    /// chain and to introduce it into the list of pending redeclaration chains
109    /// on destruction.
110    ///
111    /// The caller can choose not to introduce this ID into the redeclaration
112    /// chain by calling \c suppress().
113    class RedeclarableResult {
114      ASTReader &Reader;
115      GlobalDeclID FirstID;
116      mutable bool Owning;
117
118      RedeclarableResult &operator=(RedeclarableResult&); // DO NOT IMPLEMENT
119
120    public:
121      RedeclarableResult(ASTReader &Reader, GlobalDeclID FirstID)
122        : Reader(Reader), FirstID(FirstID), Owning(true) { }
123
124      RedeclarableResult(const RedeclarableResult &Other)
125        : Reader(Other.Reader), FirstID(Other.FirstID), Owning(Other.Owning)
126      {
127        Other.Owning = false;
128      }
129
130      ~RedeclarableResult() {
131        // FIXME: We want to suppress this when the declaration is local to
132        // a function, since there's no reason to search other AST files
133        // for redeclarations (they can't exist). However, this is hard to
134        // do locally because the declaration hasn't necessarily loaded its
135        // declaration context yet. Also, local externs still have the function
136        // as their (semantic) declaration context, which is wrong and would
137        // break this optimize.
138
139        if (FirstID && Owning && Reader.PendingDeclChainsKnown.insert(FirstID))
140          Reader.PendingDeclChains.push_back(FirstID);
141      }
142
143      /// \brief Retrieve the first ID.
144      GlobalDeclID getFirstID() const { return FirstID; }
145
146      /// \brief Do not introduce this declaration ID into the set of pending
147      /// declaration chains.
148      void suppress() {
149        Owning = false;
150      }
151    };
152
153    /// \brief Class used to capture the result of searching for an existing
154    /// declaration of a specific kind and name, along with the ability
155    /// to update the place where this result was found (the declaration
156    /// chain hanging off an identifier or the DeclContext we searched in)
157    /// if requested.
158    class FindExistingResult {
159      ASTReader &Reader;
160      NamedDecl *New;
161      NamedDecl *Existing;
162      mutable bool AddResult;
163
164      FindExistingResult &operator=(FindExistingResult&); // DO NOT IMPLEMENT
165
166    public:
167      FindExistingResult(ASTReader &Reader)
168        : Reader(Reader), New(0), Existing(0), AddResult(false) { }
169
170      FindExistingResult(ASTReader &Reader, NamedDecl *New, NamedDecl *Existing)
171        : Reader(Reader), New(New), Existing(Existing), AddResult(true) { }
172
173      FindExistingResult(const FindExistingResult &Other)
174        : Reader(Other.Reader), New(Other.New), Existing(Other.Existing),
175          AddResult(Other.AddResult)
176      {
177        Other.AddResult = false;
178      }
179
180      ~FindExistingResult();
181
182      /// \brief Suppress the addition of this result into the known set of
183      /// names.
184      void suppress() { AddResult = false; }
185
186      operator NamedDecl*() const { return Existing; }
187
188      template<typename T>
189      operator T*() const { return dyn_cast_or_null<T>(Existing); }
190    };
191
192    FindExistingResult findExisting(NamedDecl *D);
193
194  public:
195    ASTDeclReader(ASTReader &Reader, ModuleFile &F,
196                  llvm::BitstreamCursor &Cursor, DeclID thisDeclID,
197                  unsigned RawLocation,
198                  const RecordData &Record, unsigned &Idx)
199      : Reader(Reader), F(F), Cursor(Cursor), ThisDeclID(thisDeclID),
200        RawLocation(RawLocation), Record(Record), Idx(Idx),
201        TypeIDForTypeDecl(0) { }
202
203    static void attachPreviousDecl(Decl *D, Decl *previous);
204    static void attachLatestDecl(Decl *D, Decl *latest);
205
206    void Visit(Decl *D);
207
208    void UpdateDecl(Decl *D, ModuleFile &ModuleFile,
209                    const RecordData &Record);
210
211    static void setNextObjCCategory(ObjCCategoryDecl *Cat,
212                                    ObjCCategoryDecl *Next) {
213      Cat->NextClassCategory = Next;
214    }
215
216    void VisitDecl(Decl *D);
217    void VisitTranslationUnitDecl(TranslationUnitDecl *TU);
218    void VisitNamedDecl(NamedDecl *ND);
219    void VisitLabelDecl(LabelDecl *LD);
220    void VisitNamespaceDecl(NamespaceDecl *D);
221    void VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
222    void VisitNamespaceAliasDecl(NamespaceAliasDecl *D);
223    void VisitTypeDecl(TypeDecl *TD);
224    void VisitTypedefNameDecl(TypedefNameDecl *TD);
225    void VisitTypedefDecl(TypedefDecl *TD);
226    void VisitTypeAliasDecl(TypeAliasDecl *TD);
227    void VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
228    void VisitTagDecl(TagDecl *TD);
229    void VisitEnumDecl(EnumDecl *ED);
230    void VisitRecordDecl(RecordDecl *RD);
231    void VisitCXXRecordDecl(CXXRecordDecl *D);
232    void VisitClassTemplateSpecializationDecl(
233                                            ClassTemplateSpecializationDecl *D);
234    void VisitClassTemplatePartialSpecializationDecl(
235                                     ClassTemplatePartialSpecializationDecl *D);
236    void VisitClassScopeFunctionSpecializationDecl(
237                                       ClassScopeFunctionSpecializationDecl *D);
238    void VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D);
239    void VisitValueDecl(ValueDecl *VD);
240    void VisitEnumConstantDecl(EnumConstantDecl *ECD);
241    void VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
242    void VisitDeclaratorDecl(DeclaratorDecl *DD);
243    void VisitFunctionDecl(FunctionDecl *FD);
244    void VisitCXXMethodDecl(CXXMethodDecl *D);
245    void VisitCXXConstructorDecl(CXXConstructorDecl *D);
246    void VisitCXXDestructorDecl(CXXDestructorDecl *D);
247    void VisitCXXConversionDecl(CXXConversionDecl *D);
248    void VisitFieldDecl(FieldDecl *FD);
249    void VisitIndirectFieldDecl(IndirectFieldDecl *FD);
250    void VisitVarDecl(VarDecl *VD);
251    void VisitImplicitParamDecl(ImplicitParamDecl *PD);
252    void VisitParmVarDecl(ParmVarDecl *PD);
253    void VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D);
254    void VisitTemplateDecl(TemplateDecl *D);
255    RedeclarableResult VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D);
256    void VisitClassTemplateDecl(ClassTemplateDecl *D);
257    void VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
258    void VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D);
259    void VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D);
260    void VisitUsingDecl(UsingDecl *D);
261    void VisitUsingShadowDecl(UsingShadowDecl *D);
262    void VisitLinkageSpecDecl(LinkageSpecDecl *D);
263    void VisitFileScopeAsmDecl(FileScopeAsmDecl *AD);
264    void VisitImportDecl(ImportDecl *D);
265    void VisitAccessSpecDecl(AccessSpecDecl *D);
266    void VisitFriendDecl(FriendDecl *D);
267    void VisitFriendTemplateDecl(FriendTemplateDecl *D);
268    void VisitStaticAssertDecl(StaticAssertDecl *D);
269    void VisitBlockDecl(BlockDecl *BD);
270
271    std::pair<uint64_t, uint64_t> VisitDeclContext(DeclContext *DC);
272
273    template<typename T>
274    RedeclarableResult VisitRedeclarable(Redeclarable<T> *D);
275
276    template<typename T>
277    void mergeRedeclarable(Redeclarable<T> *D, RedeclarableResult &Redecl);
278
279    // FIXME: Reorder according to DeclNodes.td?
280    void VisitObjCMethodDecl(ObjCMethodDecl *D);
281    void VisitObjCContainerDecl(ObjCContainerDecl *D);
282    void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
283    void VisitObjCIvarDecl(ObjCIvarDecl *D);
284    void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
285    void VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D);
286    void VisitObjCCategoryDecl(ObjCCategoryDecl *D);
287    void VisitObjCImplDecl(ObjCImplDecl *D);
288    void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
289    void VisitObjCImplementationDecl(ObjCImplementationDecl *D);
290    void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D);
291    void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
292    void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
293  };
294}
295
296uint64_t ASTDeclReader::GetCurrentCursorOffset() {
297  return F.DeclsCursor.GetCurrentBitNo() + F.GlobalBitOffset;
298}
299
300void ASTDeclReader::Visit(Decl *D) {
301  DeclVisitor<ASTDeclReader, void>::Visit(D);
302
303  if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)) {
304    if (DD->DeclInfo) {
305      DeclaratorDecl::ExtInfo *Info =
306          DD->DeclInfo.get<DeclaratorDecl::ExtInfo *>();
307      Info->TInfo =
308          GetTypeSourceInfo(Record, Idx);
309    }
310    else {
311      DD->DeclInfo = GetTypeSourceInfo(Record, Idx);
312    }
313  }
314
315  if (TypeDecl *TD = dyn_cast<TypeDecl>(D)) {
316    // if we have a fully initialized TypeDecl, we can safely read its type now.
317    TD->setTypeForDecl(Reader.GetType(TypeIDForTypeDecl).getTypePtrOrNull());
318  } else if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(D)) {
319    // if we have a fully initialized TypeDecl, we can safely read its type now.
320    ID->TypeForDecl = Reader.GetType(TypeIDForTypeDecl).getTypePtrOrNull();
321  } else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
322    // FunctionDecl's body was written last after all other Stmts/Exprs.
323    if (Record[Idx++])
324      FD->setLazyBody(GetCurrentCursorOffset());
325  } else if (D->isTemplateParameter()) {
326    // If we have a fully initialized template parameter, we can now
327    // set its DeclContext.
328    DeclContext *SemaDC = cast<DeclContext>(
329                              Reader.GetDecl(DeclContextIDForTemplateParmDecl));
330    DeclContext *LexicalDC = cast<DeclContext>(
331                       Reader.GetDecl(LexicalDeclContextIDForTemplateParmDecl));
332    D->setDeclContextsImpl(SemaDC, LexicalDC, Reader.getContext());
333  }
334}
335
336void ASTDeclReader::VisitDecl(Decl *D) {
337  if (D->isTemplateParameter()) {
338    // We don't want to deserialize the DeclContext of a template
339    // parameter immediately, because the template parameter might be
340    // used in the formulation of its DeclContext. Use the translation
341    // unit DeclContext as a placeholder.
342    DeclContextIDForTemplateParmDecl = ReadDeclID(Record, Idx);
343    LexicalDeclContextIDForTemplateParmDecl = ReadDeclID(Record, Idx);
344    D->setDeclContext(Reader.getContext().getTranslationUnitDecl());
345  } else {
346    DeclContext *SemaDC = ReadDeclAs<DeclContext>(Record, Idx);
347    DeclContext *LexicalDC = ReadDeclAs<DeclContext>(Record, Idx);
348    // Avoid calling setLexicalDeclContext() directly because it uses
349    // Decl::getASTContext() internally which is unsafe during derialization.
350    D->setDeclContextsImpl(SemaDC, LexicalDC, Reader.getContext());
351  }
352  D->setLocation(Reader.ReadSourceLocation(F, RawLocation));
353  D->setInvalidDecl(Record[Idx++]);
354  if (Record[Idx++]) { // hasAttrs
355    AttrVec Attrs;
356    Reader.ReadAttributes(F, Attrs, Record, Idx);
357    // Avoid calling setAttrs() directly because it uses Decl::getASTContext()
358    // internally which is unsafe during derialization.
359    D->setAttrsImpl(Attrs, Reader.getContext());
360  }
361  D->setImplicit(Record[Idx++]);
362  D->setUsed(Record[Idx++]);
363  D->setReferenced(Record[Idx++]);
364  D->setTopLevelDeclInObjCContainer(Record[Idx++]);
365  D->setAccess((AccessSpecifier)Record[Idx++]);
366  D->FromASTFile = true;
367  D->setModulePrivate(Record[Idx++]);
368  D->Hidden = D->isModulePrivate();
369
370  // Determine whether this declaration is part of a (sub)module. If so, it
371  // may not yet be visible.
372  if (unsigned SubmoduleID = readSubmoduleID(Record, Idx)) {
373    // Store the owning submodule ID in the declaration.
374    D->setOwningModuleID(SubmoduleID);
375
376    // Module-private declarations are never visible, so there is no work to do.
377    if (!D->isModulePrivate()) {
378      if (Module *Owner = Reader.getSubmodule(SubmoduleID)) {
379        if (Owner->NameVisibility != Module::AllVisible) {
380          // The owning module is not visible. Mark this declaration as hidden.
381          D->Hidden = true;
382
383          // Note that this declaration was hidden because its owning module is
384          // not yet visible.
385          Reader.HiddenNamesMap[Owner].push_back(D);
386        }
387      }
388    }
389  }
390}
391
392void ASTDeclReader::VisitTranslationUnitDecl(TranslationUnitDecl *TU) {
393  llvm_unreachable("Translation units are not serialized");
394}
395
396void ASTDeclReader::VisitNamedDecl(NamedDecl *ND) {
397  VisitDecl(ND);
398  ND->setDeclName(Reader.ReadDeclarationName(F, Record, Idx));
399}
400
401void ASTDeclReader::VisitTypeDecl(TypeDecl *TD) {
402  VisitNamedDecl(TD);
403  TD->setLocStart(ReadSourceLocation(Record, Idx));
404  // Delay type reading until after we have fully initialized the decl.
405  TypeIDForTypeDecl = Reader.getGlobalTypeID(F, Record[Idx++]);
406}
407
408void ASTDeclReader::VisitTypedefNameDecl(TypedefNameDecl *TD) {
409  RedeclarableResult Redecl = VisitRedeclarable(TD);
410  VisitTypeDecl(TD);
411
412  TD->setTypeSourceInfo(GetTypeSourceInfo(Record, Idx));
413  mergeRedeclarable(TD, Redecl);
414}
415
416void ASTDeclReader::VisitTypedefDecl(TypedefDecl *TD) {
417  VisitTypedefNameDecl(TD);
418}
419
420void ASTDeclReader::VisitTypeAliasDecl(TypeAliasDecl *TD) {
421  VisitTypedefNameDecl(TD);
422}
423
424void ASTDeclReader::VisitTagDecl(TagDecl *TD) {
425  RedeclarableResult Redecl = VisitRedeclarable(TD);
426  VisitTypeDecl(TD);
427
428  TD->IdentifierNamespace = Record[Idx++];
429  TD->setTagKind((TagDecl::TagKind)Record[Idx++]);
430  TD->setCompleteDefinition(Record[Idx++]);
431  TD->setEmbeddedInDeclarator(Record[Idx++]);
432  TD->setFreeStanding(Record[Idx++]);
433  TD->setRBraceLoc(ReadSourceLocation(Record, Idx));
434
435  if (Record[Idx++]) { // hasExtInfo
436    TagDecl::ExtInfo *Info = new (Reader.getContext()) TagDecl::ExtInfo();
437    ReadQualifierInfo(*Info, Record, Idx);
438    TD->TypedefNameDeclOrQualifier = Info;
439  } else
440    TD->setTypedefNameForAnonDecl(ReadDeclAs<TypedefNameDecl>(Record, Idx));
441
442  mergeRedeclarable(TD, Redecl);
443}
444
445void ASTDeclReader::VisitEnumDecl(EnumDecl *ED) {
446  VisitTagDecl(ED);
447  if (TypeSourceInfo *TI = Reader.GetTypeSourceInfo(F, Record, Idx))
448    ED->setIntegerTypeSourceInfo(TI);
449  else
450    ED->setIntegerType(Reader.readType(F, Record, Idx));
451  ED->setPromotionType(Reader.readType(F, Record, Idx));
452  ED->setNumPositiveBits(Record[Idx++]);
453  ED->setNumNegativeBits(Record[Idx++]);
454  ED->IsScoped = Record[Idx++];
455  ED->IsScopedUsingClassTag = Record[Idx++];
456  ED->IsFixed = Record[Idx++];
457
458  if (EnumDecl *InstED = ReadDeclAs<EnumDecl>(Record, Idx)) {
459    TemplateSpecializationKind TSK = (TemplateSpecializationKind)Record[Idx++];
460    SourceLocation POI = ReadSourceLocation(Record, Idx);
461    ED->setInstantiationOfMemberEnum(Reader.getContext(), InstED, TSK);
462    ED->getMemberSpecializationInfo()->setPointOfInstantiation(POI);
463  }
464}
465
466void ASTDeclReader::VisitRecordDecl(RecordDecl *RD) {
467  VisitTagDecl(RD);
468  RD->setHasFlexibleArrayMember(Record[Idx++]);
469  RD->setAnonymousStructOrUnion(Record[Idx++]);
470  RD->setHasObjectMember(Record[Idx++]);
471}
472
473void ASTDeclReader::VisitValueDecl(ValueDecl *VD) {
474  VisitNamedDecl(VD);
475  VD->setType(Reader.readType(F, Record, Idx));
476}
477
478void ASTDeclReader::VisitEnumConstantDecl(EnumConstantDecl *ECD) {
479  VisitValueDecl(ECD);
480  if (Record[Idx++])
481    ECD->setInitExpr(Reader.ReadExpr(F));
482  ECD->setInitVal(Reader.ReadAPSInt(Record, Idx));
483}
484
485void ASTDeclReader::VisitDeclaratorDecl(DeclaratorDecl *DD) {
486  VisitValueDecl(DD);
487  DD->setInnerLocStart(ReadSourceLocation(Record, Idx));
488  if (Record[Idx++]) { // hasExtInfo
489    DeclaratorDecl::ExtInfo *Info
490        = new (Reader.getContext()) DeclaratorDecl::ExtInfo();
491    ReadQualifierInfo(*Info, Record, Idx);
492    DD->DeclInfo = Info;
493  }
494}
495
496void ASTDeclReader::VisitFunctionDecl(FunctionDecl *FD) {
497  RedeclarableResult Redecl = VisitRedeclarable(FD);
498  VisitDeclaratorDecl(FD);
499
500  ReadDeclarationNameLoc(FD->DNLoc, FD->getDeclName(), Record, Idx);
501  FD->IdentifierNamespace = Record[Idx++];
502
503  // FunctionDecl's body is handled last at ASTDeclReader::Visit,
504  // after everything else is read.
505
506  FD->SClass = (StorageClass)Record[Idx++];
507  FD->SClassAsWritten = (StorageClass)Record[Idx++];
508  FD->IsInline = Record[Idx++];
509  FD->IsInlineSpecified = Record[Idx++];
510  FD->IsVirtualAsWritten = Record[Idx++];
511  FD->IsPure = Record[Idx++];
512  FD->HasInheritedPrototype = Record[Idx++];
513  FD->HasWrittenPrototype = Record[Idx++];
514  FD->IsDeleted = Record[Idx++];
515  FD->IsTrivial = Record[Idx++];
516  FD->IsDefaulted = Record[Idx++];
517  FD->IsExplicitlyDefaulted = Record[Idx++];
518  FD->HasImplicitReturnZero = Record[Idx++];
519  FD->IsConstexpr = Record[Idx++];
520  FD->EndRangeLoc = ReadSourceLocation(Record, Idx);
521
522  switch ((FunctionDecl::TemplatedKind)Record[Idx++]) {
523  case FunctionDecl::TK_NonTemplate:
524    mergeRedeclarable(FD, Redecl);
525    break;
526  case FunctionDecl::TK_FunctionTemplate:
527    FD->setDescribedFunctionTemplate(ReadDeclAs<FunctionTemplateDecl>(Record,
528                                                                      Idx));
529    break;
530  case FunctionDecl::TK_MemberSpecialization: {
531    FunctionDecl *InstFD = ReadDeclAs<FunctionDecl>(Record, Idx);
532    TemplateSpecializationKind TSK = (TemplateSpecializationKind)Record[Idx++];
533    SourceLocation POI = ReadSourceLocation(Record, Idx);
534    FD->setInstantiationOfMemberFunction(Reader.getContext(), InstFD, TSK);
535    FD->getMemberSpecializationInfo()->setPointOfInstantiation(POI);
536    break;
537  }
538  case FunctionDecl::TK_FunctionTemplateSpecialization: {
539    FunctionTemplateDecl *Template = ReadDeclAs<FunctionTemplateDecl>(Record,
540                                                                      Idx);
541    TemplateSpecializationKind TSK = (TemplateSpecializationKind)Record[Idx++];
542
543    // Template arguments.
544    SmallVector<TemplateArgument, 8> TemplArgs;
545    Reader.ReadTemplateArgumentList(TemplArgs, F, Record, Idx);
546
547    // Template args as written.
548    SmallVector<TemplateArgumentLoc, 8> TemplArgLocs;
549    SourceLocation LAngleLoc, RAngleLoc;
550    bool HasTemplateArgumentsAsWritten = Record[Idx++];
551    if (HasTemplateArgumentsAsWritten) {
552      unsigned NumTemplateArgLocs = Record[Idx++];
553      TemplArgLocs.reserve(NumTemplateArgLocs);
554      for (unsigned i=0; i != NumTemplateArgLocs; ++i)
555        TemplArgLocs.push_back(
556            Reader.ReadTemplateArgumentLoc(F, Record, Idx));
557
558      LAngleLoc = ReadSourceLocation(Record, Idx);
559      RAngleLoc = ReadSourceLocation(Record, Idx);
560    }
561
562    SourceLocation POI = ReadSourceLocation(Record, Idx);
563
564    ASTContext &C = Reader.getContext();
565    TemplateArgumentList *TemplArgList
566      = TemplateArgumentList::CreateCopy(C, TemplArgs.data(), TemplArgs.size());
567    TemplateArgumentListInfo TemplArgsInfo(LAngleLoc, RAngleLoc);
568    for (unsigned i=0, e = TemplArgLocs.size(); i != e; ++i)
569      TemplArgsInfo.addArgument(TemplArgLocs[i]);
570    FunctionTemplateSpecializationInfo *FTInfo
571        = FunctionTemplateSpecializationInfo::Create(C, FD, Template, TSK,
572                                                     TemplArgList,
573                             HasTemplateArgumentsAsWritten ? &TemplArgsInfo : 0,
574                                                     POI);
575    FD->TemplateOrSpecialization = FTInfo;
576
577    if (FD->isCanonicalDecl()) { // if canonical add to template's set.
578      // The template that contains the specializations set. It's not safe to
579      // use getCanonicalDecl on Template since it may still be initializing.
580      FunctionTemplateDecl *CanonTemplate
581        = ReadDeclAs<FunctionTemplateDecl>(Record, Idx);
582      // Get the InsertPos by FindNodeOrInsertPos() instead of calling
583      // InsertNode(FTInfo) directly to avoid the getASTContext() call in
584      // FunctionTemplateSpecializationInfo's Profile().
585      // We avoid getASTContext because a decl in the parent hierarchy may
586      // be initializing.
587      llvm::FoldingSetNodeID ID;
588      FunctionTemplateSpecializationInfo::Profile(ID, TemplArgs.data(),
589                                                  TemplArgs.size(), C);
590      void *InsertPos = 0;
591      CanonTemplate->getSpecializations().FindNodeOrInsertPos(ID, InsertPos);
592      assert(InsertPos && "Another specialization already inserted!");
593      CanonTemplate->getSpecializations().InsertNode(FTInfo, InsertPos);
594    }
595    break;
596  }
597  case FunctionDecl::TK_DependentFunctionTemplateSpecialization: {
598    // Templates.
599    UnresolvedSet<8> TemplDecls;
600    unsigned NumTemplates = Record[Idx++];
601    while (NumTemplates--)
602      TemplDecls.addDecl(ReadDeclAs<NamedDecl>(Record, Idx));
603
604    // Templates args.
605    TemplateArgumentListInfo TemplArgs;
606    unsigned NumArgs = Record[Idx++];
607    while (NumArgs--)
608      TemplArgs.addArgument(Reader.ReadTemplateArgumentLoc(F, Record, Idx));
609    TemplArgs.setLAngleLoc(ReadSourceLocation(Record, Idx));
610    TemplArgs.setRAngleLoc(ReadSourceLocation(Record, Idx));
611
612    FD->setDependentTemplateSpecialization(Reader.getContext(),
613                                           TemplDecls, TemplArgs);
614    break;
615  }
616  }
617
618  // Read in the parameters.
619  unsigned NumParams = Record[Idx++];
620  SmallVector<ParmVarDecl *, 16> Params;
621  Params.reserve(NumParams);
622  for (unsigned I = 0; I != NumParams; ++I)
623    Params.push_back(ReadDeclAs<ParmVarDecl>(Record, Idx));
624  FD->setParams(Reader.getContext(), Params);
625}
626
627void ASTDeclReader::VisitObjCMethodDecl(ObjCMethodDecl *MD) {
628  VisitNamedDecl(MD);
629  if (Record[Idx++]) {
630    // In practice, this won't be executed (since method definitions
631    // don't occur in header files).
632    MD->setBody(Reader.ReadStmt(F));
633    MD->setSelfDecl(ReadDeclAs<ImplicitParamDecl>(Record, Idx));
634    MD->setCmdDecl(ReadDeclAs<ImplicitParamDecl>(Record, Idx));
635  }
636  MD->setInstanceMethod(Record[Idx++]);
637  MD->setVariadic(Record[Idx++]);
638  MD->setSynthesized(Record[Idx++]);
639  MD->setDefined(Record[Idx++]);
640
641  MD->IsRedeclaration = Record[Idx++];
642  MD->HasRedeclaration = Record[Idx++];
643  if (MD->HasRedeclaration)
644    Reader.getContext().setObjCMethodRedeclaration(MD,
645                                       ReadDeclAs<ObjCMethodDecl>(Record, Idx));
646
647  MD->setDeclImplementation((ObjCMethodDecl::ImplementationControl)Record[Idx++]);
648  MD->setObjCDeclQualifier((Decl::ObjCDeclQualifier)Record[Idx++]);
649  MD->SetRelatedResultType(Record[Idx++]);
650  MD->setResultType(Reader.readType(F, Record, Idx));
651  MD->setResultTypeSourceInfo(GetTypeSourceInfo(Record, Idx));
652  MD->setEndLoc(ReadSourceLocation(Record, Idx));
653  unsigned NumParams = Record[Idx++];
654  SmallVector<ParmVarDecl *, 16> Params;
655  Params.reserve(NumParams);
656  for (unsigned I = 0; I != NumParams; ++I)
657    Params.push_back(ReadDeclAs<ParmVarDecl>(Record, Idx));
658
659  MD->SelLocsKind = Record[Idx++];
660  unsigned NumStoredSelLocs = Record[Idx++];
661  SmallVector<SourceLocation, 16> SelLocs;
662  SelLocs.reserve(NumStoredSelLocs);
663  for (unsigned i = 0; i != NumStoredSelLocs; ++i)
664    SelLocs.push_back(ReadSourceLocation(Record, Idx));
665
666  MD->setParamsAndSelLocs(Reader.getContext(), Params, SelLocs);
667}
668
669void ASTDeclReader::VisitObjCContainerDecl(ObjCContainerDecl *CD) {
670  VisitNamedDecl(CD);
671  CD->setAtStartLoc(ReadSourceLocation(Record, Idx));
672  CD->setAtEndRange(ReadSourceRange(Record, Idx));
673}
674
675void ASTDeclReader::VisitObjCInterfaceDecl(ObjCInterfaceDecl *ID) {
676  RedeclarableResult Redecl = VisitRedeclarable(ID);
677  VisitObjCContainerDecl(ID);
678  TypeIDForTypeDecl = Reader.getGlobalTypeID(F, Record[Idx++]);
679  mergeRedeclarable(ID, Redecl);
680
681  if (Record[Idx++]) {
682    // Read the definition.
683    ID->allocateDefinitionData();
684
685    // Set the definition data of the canonical declaration, so other
686    // redeclarations will see it.
687    ID->getCanonicalDecl()->Data = ID->Data;
688
689    ObjCInterfaceDecl::DefinitionData &Data = ID->data();
690
691    // Read the superclass.
692    Data.SuperClass = ReadDeclAs<ObjCInterfaceDecl>(Record, Idx);
693    Data.SuperClassLoc = ReadSourceLocation(Record, Idx);
694
695    Data.EndLoc = ReadSourceLocation(Record, Idx);
696
697    // Read the directly referenced protocols and their SourceLocations.
698    unsigned NumProtocols = Record[Idx++];
699    SmallVector<ObjCProtocolDecl *, 16> Protocols;
700    Protocols.reserve(NumProtocols);
701    for (unsigned I = 0; I != NumProtocols; ++I)
702      Protocols.push_back(ReadDeclAs<ObjCProtocolDecl>(Record, Idx));
703    SmallVector<SourceLocation, 16> ProtoLocs;
704    ProtoLocs.reserve(NumProtocols);
705    for (unsigned I = 0; I != NumProtocols; ++I)
706      ProtoLocs.push_back(ReadSourceLocation(Record, Idx));
707    ID->setProtocolList(Protocols.data(), NumProtocols, ProtoLocs.data(),
708                        Reader.getContext());
709
710    // Read the transitive closure of protocols referenced by this class.
711    NumProtocols = Record[Idx++];
712    Protocols.clear();
713    Protocols.reserve(NumProtocols);
714    for (unsigned I = 0; I != NumProtocols; ++I)
715      Protocols.push_back(ReadDeclAs<ObjCProtocolDecl>(Record, Idx));
716    ID->data().AllReferencedProtocols.set(Protocols.data(), NumProtocols,
717                                          Reader.getContext());
718
719    // We will rebuild this list lazily.
720    ID->setIvarList(0);
721
722    // Note that we have deserialized a definition.
723    Reader.PendingDefinitions.insert(ID);
724
725    // Note that we've loaded this Objective-C class.
726    Reader.ObjCClassesLoaded.push_back(ID);
727  } else {
728    ID->Data = ID->getCanonicalDecl()->Data;
729  }
730}
731
732void ASTDeclReader::VisitObjCIvarDecl(ObjCIvarDecl *IVD) {
733  VisitFieldDecl(IVD);
734  IVD->setAccessControl((ObjCIvarDecl::AccessControl)Record[Idx++]);
735  // This field will be built lazily.
736  IVD->setNextIvar(0);
737  bool synth = Record[Idx++];
738  IVD->setSynthesize(synth);
739}
740
741void ASTDeclReader::VisitObjCProtocolDecl(ObjCProtocolDecl *PD) {
742  RedeclarableResult Redecl = VisitRedeclarable(PD);
743  VisitObjCContainerDecl(PD);
744  mergeRedeclarable(PD, Redecl);
745
746  if (Record[Idx++]) {
747    // Read the definition.
748    PD->allocateDefinitionData();
749
750    // Set the definition data of the canonical declaration, so other
751    // redeclarations will see it.
752    PD->getCanonicalDecl()->Data = PD->Data;
753
754    unsigned NumProtoRefs = Record[Idx++];
755    SmallVector<ObjCProtocolDecl *, 16> ProtoRefs;
756    ProtoRefs.reserve(NumProtoRefs);
757    for (unsigned I = 0; I != NumProtoRefs; ++I)
758      ProtoRefs.push_back(ReadDeclAs<ObjCProtocolDecl>(Record, Idx));
759    SmallVector<SourceLocation, 16> ProtoLocs;
760    ProtoLocs.reserve(NumProtoRefs);
761    for (unsigned I = 0; I != NumProtoRefs; ++I)
762      ProtoLocs.push_back(ReadSourceLocation(Record, Idx));
763    PD->setProtocolList(ProtoRefs.data(), NumProtoRefs, ProtoLocs.data(),
764                        Reader.getContext());
765
766    // Note that we have deserialized a definition.
767    Reader.PendingDefinitions.insert(PD);
768  } else {
769    PD->Data = PD->getCanonicalDecl()->Data;
770  }
771}
772
773void ASTDeclReader::VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *FD) {
774  VisitFieldDecl(FD);
775}
776
777void ASTDeclReader::VisitObjCCategoryDecl(ObjCCategoryDecl *CD) {
778  VisitObjCContainerDecl(CD);
779  CD->setCategoryNameLoc(ReadSourceLocation(Record, Idx));
780  CD->setIvarLBraceLoc(ReadSourceLocation(Record, Idx));
781  CD->setIvarRBraceLoc(ReadSourceLocation(Record, Idx));
782
783  // Note that this category has been deserialized. We do this before
784  // deserializing the interface declaration, so that it will consider this
785  /// category.
786  Reader.CategoriesDeserialized.insert(CD);
787
788  CD->ClassInterface = ReadDeclAs<ObjCInterfaceDecl>(Record, Idx);
789  unsigned NumProtoRefs = Record[Idx++];
790  SmallVector<ObjCProtocolDecl *, 16> ProtoRefs;
791  ProtoRefs.reserve(NumProtoRefs);
792  for (unsigned I = 0; I != NumProtoRefs; ++I)
793    ProtoRefs.push_back(ReadDeclAs<ObjCProtocolDecl>(Record, Idx));
794  SmallVector<SourceLocation, 16> ProtoLocs;
795  ProtoLocs.reserve(NumProtoRefs);
796  for (unsigned I = 0; I != NumProtoRefs; ++I)
797    ProtoLocs.push_back(ReadSourceLocation(Record, Idx));
798  CD->setProtocolList(ProtoRefs.data(), NumProtoRefs, ProtoLocs.data(),
799                      Reader.getContext());
800  CD->setHasSynthBitfield(Record[Idx++]);
801}
802
803void ASTDeclReader::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *CAD) {
804  VisitNamedDecl(CAD);
805  CAD->setClassInterface(ReadDeclAs<ObjCInterfaceDecl>(Record, Idx));
806}
807
808void ASTDeclReader::VisitObjCPropertyDecl(ObjCPropertyDecl *D) {
809  VisitNamedDecl(D);
810  D->setAtLoc(ReadSourceLocation(Record, Idx));
811  D->setLParenLoc(ReadSourceLocation(Record, Idx));
812  D->setType(GetTypeSourceInfo(Record, Idx));
813  // FIXME: stable encoding
814  D->setPropertyAttributes(
815                      (ObjCPropertyDecl::PropertyAttributeKind)Record[Idx++]);
816  D->setPropertyAttributesAsWritten(
817                      (ObjCPropertyDecl::PropertyAttributeKind)Record[Idx++]);
818  // FIXME: stable encoding
819  D->setPropertyImplementation(
820                            (ObjCPropertyDecl::PropertyControl)Record[Idx++]);
821  D->setGetterName(Reader.ReadDeclarationName(F,Record, Idx).getObjCSelector());
822  D->setSetterName(Reader.ReadDeclarationName(F,Record, Idx).getObjCSelector());
823  D->setGetterMethodDecl(ReadDeclAs<ObjCMethodDecl>(Record, Idx));
824  D->setSetterMethodDecl(ReadDeclAs<ObjCMethodDecl>(Record, Idx));
825  D->setPropertyIvarDecl(ReadDeclAs<ObjCIvarDecl>(Record, Idx));
826}
827
828void ASTDeclReader::VisitObjCImplDecl(ObjCImplDecl *D) {
829  VisitObjCContainerDecl(D);
830  D->setClassInterface(ReadDeclAs<ObjCInterfaceDecl>(Record, Idx));
831}
832
833void ASTDeclReader::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D) {
834  VisitObjCImplDecl(D);
835  D->setIdentifier(Reader.GetIdentifierInfo(F, Record, Idx));
836  D->CategoryNameLoc = ReadSourceLocation(Record, Idx);
837}
838
839void ASTDeclReader::VisitObjCImplementationDecl(ObjCImplementationDecl *D) {
840  VisitObjCImplDecl(D);
841  D->setSuperClass(ReadDeclAs<ObjCInterfaceDecl>(Record, Idx));
842  D->setIvarLBraceLoc(ReadSourceLocation(Record, Idx));
843  D->setIvarRBraceLoc(ReadSourceLocation(Record, Idx));
844  llvm::tie(D->IvarInitializers, D->NumIvarInitializers)
845      = Reader.ReadCXXCtorInitializers(F, Record, Idx);
846  D->setHasSynthBitfield(Record[Idx++]);
847}
848
849
850void ASTDeclReader::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D) {
851  VisitDecl(D);
852  D->setAtLoc(ReadSourceLocation(Record, Idx));
853  D->setPropertyDecl(ReadDeclAs<ObjCPropertyDecl>(Record, Idx));
854  D->PropertyIvarDecl = ReadDeclAs<ObjCIvarDecl>(Record, Idx);
855  D->IvarLoc = ReadSourceLocation(Record, Idx);
856  D->setGetterCXXConstructor(Reader.ReadExpr(F));
857  D->setSetterCXXAssignment(Reader.ReadExpr(F));
858}
859
860void ASTDeclReader::VisitFieldDecl(FieldDecl *FD) {
861  VisitDeclaratorDecl(FD);
862  FD->setMutable(Record[Idx++]);
863  int BitWidthOrInitializer = Record[Idx++];
864  if (BitWidthOrInitializer == 1)
865    FD->setBitWidth(Reader.ReadExpr(F));
866  else if (BitWidthOrInitializer == 2)
867    FD->setInClassInitializer(Reader.ReadExpr(F));
868  if (!FD->getDeclName()) {
869    if (FieldDecl *Tmpl = ReadDeclAs<FieldDecl>(Record, Idx))
870      Reader.getContext().setInstantiatedFromUnnamedFieldDecl(FD, Tmpl);
871  }
872}
873
874void ASTDeclReader::VisitIndirectFieldDecl(IndirectFieldDecl *FD) {
875  VisitValueDecl(FD);
876
877  FD->ChainingSize = Record[Idx++];
878  assert(FD->ChainingSize >= 2 && "Anonymous chaining must be >= 2");
879  FD->Chaining = new (Reader.getContext())NamedDecl*[FD->ChainingSize];
880
881  for (unsigned I = 0; I != FD->ChainingSize; ++I)
882    FD->Chaining[I] = ReadDeclAs<NamedDecl>(Record, Idx);
883}
884
885void ASTDeclReader::VisitVarDecl(VarDecl *VD) {
886  RedeclarableResult Redecl = VisitRedeclarable(VD);
887  VisitDeclaratorDecl(VD);
888
889  VD->VarDeclBits.SClass = (StorageClass)Record[Idx++];
890  VD->VarDeclBits.SClassAsWritten = (StorageClass)Record[Idx++];
891  VD->VarDeclBits.ThreadSpecified = Record[Idx++];
892  VD->VarDeclBits.InitStyle = Record[Idx++];
893  VD->VarDeclBits.ExceptionVar = Record[Idx++];
894  VD->VarDeclBits.NRVOVariable = Record[Idx++];
895  VD->VarDeclBits.CXXForRangeDecl = Record[Idx++];
896  VD->VarDeclBits.ARCPseudoStrong = Record[Idx++];
897
898  // Only true variables (not parameters or implicit parameters) can be merged.
899  if (VD->getKind() == Decl::Var)
900    mergeRedeclarable(VD, Redecl);
901
902  if (uint64_t Val = Record[Idx++]) {
903    VD->setInit(Reader.ReadExpr(F));
904    if (Val > 1) {
905      EvaluatedStmt *Eval = VD->ensureEvaluatedStmt();
906      Eval->CheckedICE = true;
907      Eval->IsICE = Val == 3;
908    }
909  }
910
911  if (Record[Idx++]) { // HasMemberSpecializationInfo.
912    VarDecl *Tmpl = ReadDeclAs<VarDecl>(Record, Idx);
913    TemplateSpecializationKind TSK = (TemplateSpecializationKind)Record[Idx++];
914    SourceLocation POI = ReadSourceLocation(Record, Idx);
915    Reader.getContext().setInstantiatedFromStaticDataMember(VD, Tmpl, TSK,POI);
916  }
917}
918
919void ASTDeclReader::VisitImplicitParamDecl(ImplicitParamDecl *PD) {
920  VisitVarDecl(PD);
921}
922
923void ASTDeclReader::VisitParmVarDecl(ParmVarDecl *PD) {
924  VisitVarDecl(PD);
925  unsigned isObjCMethodParam = Record[Idx++];
926  unsigned scopeDepth = Record[Idx++];
927  unsigned scopeIndex = Record[Idx++];
928  unsigned declQualifier = Record[Idx++];
929  if (isObjCMethodParam) {
930    assert(scopeDepth == 0);
931    PD->setObjCMethodScopeInfo(scopeIndex);
932    PD->ParmVarDeclBits.ScopeDepthOrObjCQuals = declQualifier;
933  } else {
934    PD->setScopeInfo(scopeDepth, scopeIndex);
935  }
936  PD->ParmVarDeclBits.IsKNRPromoted = Record[Idx++];
937  PD->ParmVarDeclBits.HasInheritedDefaultArg = Record[Idx++];
938  if (Record[Idx++]) // hasUninstantiatedDefaultArg.
939    PD->setUninstantiatedDefaultArg(Reader.ReadExpr(F));
940}
941
942void ASTDeclReader::VisitFileScopeAsmDecl(FileScopeAsmDecl *AD) {
943  VisitDecl(AD);
944  AD->setAsmString(cast<StringLiteral>(Reader.ReadExpr(F)));
945  AD->setRParenLoc(ReadSourceLocation(Record, Idx));
946}
947
948void ASTDeclReader::VisitBlockDecl(BlockDecl *BD) {
949  VisitDecl(BD);
950  BD->setBody(cast_or_null<CompoundStmt>(Reader.ReadStmt(F)));
951  BD->setSignatureAsWritten(GetTypeSourceInfo(Record, Idx));
952  unsigned NumParams = Record[Idx++];
953  SmallVector<ParmVarDecl *, 16> Params;
954  Params.reserve(NumParams);
955  for (unsigned I = 0; I != NumParams; ++I)
956    Params.push_back(ReadDeclAs<ParmVarDecl>(Record, Idx));
957  BD->setParams(Params);
958
959  BD->setIsVariadic(Record[Idx++]);
960  BD->setBlockMissingReturnType(Record[Idx++]);
961  BD->setIsConversionFromLambda(Record[Idx++]);
962
963  bool capturesCXXThis = Record[Idx++];
964  unsigned numCaptures = Record[Idx++];
965  SmallVector<BlockDecl::Capture, 16> captures;
966  captures.reserve(numCaptures);
967  for (unsigned i = 0; i != numCaptures; ++i) {
968    VarDecl *decl = ReadDeclAs<VarDecl>(Record, Idx);
969    unsigned flags = Record[Idx++];
970    bool byRef = (flags & 1);
971    bool nested = (flags & 2);
972    Expr *copyExpr = ((flags & 4) ? Reader.ReadExpr(F) : 0);
973
974    captures.push_back(BlockDecl::Capture(decl, byRef, nested, copyExpr));
975  }
976  BD->setCaptures(Reader.getContext(), captures.begin(),
977                  captures.end(), capturesCXXThis);
978}
979
980void ASTDeclReader::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
981  VisitDecl(D);
982  D->setLanguage((LinkageSpecDecl::LanguageIDs)Record[Idx++]);
983  D->setExternLoc(ReadSourceLocation(Record, Idx));
984  D->setRBraceLoc(ReadSourceLocation(Record, Idx));
985}
986
987void ASTDeclReader::VisitLabelDecl(LabelDecl *D) {
988  VisitNamedDecl(D);
989  D->setLocStart(ReadSourceLocation(Record, Idx));
990}
991
992
993void ASTDeclReader::VisitNamespaceDecl(NamespaceDecl *D) {
994  RedeclarableResult Redecl = VisitRedeclarable(D);
995  VisitNamedDecl(D);
996  D->setInline(Record[Idx++]);
997  D->LocStart = ReadSourceLocation(Record, Idx);
998  D->RBraceLoc = ReadSourceLocation(Record, Idx);
999  mergeRedeclarable(D, Redecl);
1000
1001  if (Redecl.getFirstID() == ThisDeclID) {
1002    // Each module has its own anonymous namespace, which is disjoint from
1003    // any other module's anonymous namespaces, so don't attach the anonymous
1004    // namespace at all.
1005    NamespaceDecl *Anon = ReadDeclAs<NamespaceDecl>(Record, Idx);
1006    if (F.Kind != MK_Module)
1007      D->setAnonymousNamespace(Anon);
1008  } else {
1009    // Link this namespace back to the first declaration, which has already
1010    // been deserialized.
1011    D->AnonOrFirstNamespaceAndInline.setPointer(D->getFirstDeclaration());
1012  }
1013}
1014
1015void ASTDeclReader::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
1016  VisitNamedDecl(D);
1017  D->NamespaceLoc = ReadSourceLocation(Record, Idx);
1018  D->IdentLoc = ReadSourceLocation(Record, Idx);
1019  D->QualifierLoc = Reader.ReadNestedNameSpecifierLoc(F, Record, Idx);
1020  D->Namespace = ReadDeclAs<NamedDecl>(Record, Idx);
1021}
1022
1023void ASTDeclReader::VisitUsingDecl(UsingDecl *D) {
1024  VisitNamedDecl(D);
1025  D->setUsingLocation(ReadSourceLocation(Record, Idx));
1026  D->QualifierLoc = Reader.ReadNestedNameSpecifierLoc(F, Record, Idx);
1027  ReadDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record, Idx);
1028  D->FirstUsingShadow.setPointer(ReadDeclAs<UsingShadowDecl>(Record, Idx));
1029  D->setTypeName(Record[Idx++]);
1030  if (NamedDecl *Pattern = ReadDeclAs<NamedDecl>(Record, Idx))
1031    Reader.getContext().setInstantiatedFromUsingDecl(D, Pattern);
1032}
1033
1034void ASTDeclReader::VisitUsingShadowDecl(UsingShadowDecl *D) {
1035  VisitNamedDecl(D);
1036  D->setTargetDecl(ReadDeclAs<NamedDecl>(Record, Idx));
1037  D->UsingOrNextShadow = ReadDeclAs<NamedDecl>(Record, Idx);
1038  UsingShadowDecl *Pattern = ReadDeclAs<UsingShadowDecl>(Record, Idx);
1039  if (Pattern)
1040    Reader.getContext().setInstantiatedFromUsingShadowDecl(D, Pattern);
1041}
1042
1043void ASTDeclReader::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
1044  VisitNamedDecl(D);
1045  D->UsingLoc = ReadSourceLocation(Record, Idx);
1046  D->NamespaceLoc = ReadSourceLocation(Record, Idx);
1047  D->QualifierLoc = Reader.ReadNestedNameSpecifierLoc(F, Record, Idx);
1048  D->NominatedNamespace = ReadDeclAs<NamedDecl>(Record, Idx);
1049  D->CommonAncestor = ReadDeclAs<DeclContext>(Record, Idx);
1050}
1051
1052void ASTDeclReader::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
1053  VisitValueDecl(D);
1054  D->setUsingLoc(ReadSourceLocation(Record, Idx));
1055  D->QualifierLoc = Reader.ReadNestedNameSpecifierLoc(F, Record, Idx);
1056  ReadDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record, Idx);
1057}
1058
1059void ASTDeclReader::VisitUnresolvedUsingTypenameDecl(
1060                                               UnresolvedUsingTypenameDecl *D) {
1061  VisitTypeDecl(D);
1062  D->TypenameLocation = ReadSourceLocation(Record, Idx);
1063  D->QualifierLoc = Reader.ReadNestedNameSpecifierLoc(F, Record, Idx);
1064}
1065
1066void ASTDeclReader::ReadCXXDefinitionData(
1067                                   struct CXXRecordDecl::DefinitionData &Data,
1068                                   const RecordData &Record, unsigned &Idx) {
1069  // Note: the caller has deserialized the IsLambda bit already.
1070  Data.UserDeclaredConstructor = Record[Idx++];
1071  Data.UserDeclaredCopyConstructor = Record[Idx++];
1072  Data.UserDeclaredMoveConstructor = Record[Idx++];
1073  Data.UserDeclaredCopyAssignment = Record[Idx++];
1074  Data.UserDeclaredMoveAssignment = Record[Idx++];
1075  Data.UserDeclaredDestructor = Record[Idx++];
1076  Data.Aggregate = Record[Idx++];
1077  Data.PlainOldData = Record[Idx++];
1078  Data.Empty = Record[Idx++];
1079  Data.Polymorphic = Record[Idx++];
1080  Data.Abstract = Record[Idx++];
1081  Data.IsStandardLayout = Record[Idx++];
1082  Data.HasNoNonEmptyBases = Record[Idx++];
1083  Data.HasPrivateFields = Record[Idx++];
1084  Data.HasProtectedFields = Record[Idx++];
1085  Data.HasPublicFields = Record[Idx++];
1086  Data.HasMutableFields = Record[Idx++];
1087  Data.HasOnlyCMembers = Record[Idx++];
1088  Data.HasTrivialDefaultConstructor = Record[Idx++];
1089  Data.HasConstexprNonCopyMoveConstructor = Record[Idx++];
1090  Data.DefaultedDefaultConstructorIsConstexpr = Record[Idx++];
1091  Data.DefaultedCopyConstructorIsConstexpr = Record[Idx++];
1092  Data.DefaultedMoveConstructorIsConstexpr = Record[Idx++];
1093  Data.HasConstexprDefaultConstructor = Record[Idx++];
1094  Data.HasConstexprCopyConstructor = Record[Idx++];
1095  Data.HasConstexprMoveConstructor = Record[Idx++];
1096  Data.HasTrivialCopyConstructor = Record[Idx++];
1097  Data.HasTrivialMoveConstructor = Record[Idx++];
1098  Data.HasTrivialCopyAssignment = Record[Idx++];
1099  Data.HasTrivialMoveAssignment = Record[Idx++];
1100  Data.HasTrivialDestructor = Record[Idx++];
1101  Data.HasIrrelevantDestructor = Record[Idx++];
1102  Data.HasNonLiteralTypeFieldsOrBases = Record[Idx++];
1103  Data.ComputedVisibleConversions = Record[Idx++];
1104  Data.UserProvidedDefaultConstructor = Record[Idx++];
1105  Data.DeclaredDefaultConstructor = Record[Idx++];
1106  Data.DeclaredCopyConstructor = Record[Idx++];
1107  Data.DeclaredMoveConstructor = Record[Idx++];
1108  Data.DeclaredCopyAssignment = Record[Idx++];
1109  Data.DeclaredMoveAssignment = Record[Idx++];
1110  Data.DeclaredDestructor = Record[Idx++];
1111  Data.FailedImplicitMoveConstructor = Record[Idx++];
1112  Data.FailedImplicitMoveAssignment = Record[Idx++];
1113
1114  Data.NumBases = Record[Idx++];
1115  if (Data.NumBases)
1116    Data.Bases = Reader.readCXXBaseSpecifiers(F, Record, Idx);
1117  Data.NumVBases = Record[Idx++];
1118  if (Data.NumVBases)
1119    Data.VBases = Reader.readCXXBaseSpecifiers(F, Record, Idx);
1120
1121  Reader.ReadUnresolvedSet(F, Data.Conversions, Record, Idx);
1122  Reader.ReadUnresolvedSet(F, Data.VisibleConversions, Record, Idx);
1123  assert(Data.Definition && "Data.Definition should be already set!");
1124  Data.FirstFriend = ReadDeclAs<FriendDecl>(Record, Idx);
1125
1126  if (Data.IsLambda) {
1127    typedef LambdaExpr::Capture Capture;
1128    CXXRecordDecl::LambdaDefinitionData &Lambda
1129      = static_cast<CXXRecordDecl::LambdaDefinitionData &>(Data);
1130    Lambda.Dependent = Record[Idx++];
1131    Lambda.NumCaptures = Record[Idx++];
1132    Lambda.NumExplicitCaptures = Record[Idx++];
1133    Lambda.ManglingNumber = Record[Idx++];
1134    Lambda.ContextDecl = ReadDecl(Record, Idx);
1135    Lambda.Captures
1136      = (Capture*)Reader.Context.Allocate(sizeof(Capture)*Lambda.NumCaptures);
1137    Capture *ToCapture = Lambda.Captures;
1138    for (unsigned I = 0, N = Lambda.NumCaptures; I != N; ++I) {
1139      SourceLocation Loc = ReadSourceLocation(Record, Idx);
1140      bool IsImplicit = Record[Idx++];
1141      LambdaCaptureKind Kind = static_cast<LambdaCaptureKind>(Record[Idx++]);
1142      VarDecl *Var = ReadDeclAs<VarDecl>(Record, Idx);
1143      SourceLocation EllipsisLoc = ReadSourceLocation(Record, Idx);
1144      *ToCapture++ = Capture(Loc, IsImplicit, Kind, Var, EllipsisLoc);
1145    }
1146  }
1147}
1148
1149void ASTDeclReader::VisitCXXRecordDecl(CXXRecordDecl *D) {
1150  VisitRecordDecl(D);
1151
1152  ASTContext &C = Reader.getContext();
1153  if (Record[Idx++]) {
1154    // Determine whether this is a lambda closure type, so that we can
1155    // allocate the appropriate DefinitionData structure.
1156    bool IsLambda = Record[Idx++];
1157    if (IsLambda)
1158      D->DefinitionData = new (C) CXXRecordDecl::LambdaDefinitionData(D, false);
1159    else
1160      D->DefinitionData = new (C) struct CXXRecordDecl::DefinitionData(D);
1161
1162    // Propagate the DefinitionData pointer to the canonical declaration, so
1163    // that all other deserialized declarations will see it.
1164    // FIXME: Complain if there already is a DefinitionData!
1165    D->getCanonicalDecl()->DefinitionData = D->DefinitionData;
1166
1167    ReadCXXDefinitionData(*D->DefinitionData, Record, Idx);
1168
1169    // Note that we have deserialized a definition. Any declarations
1170    // deserialized before this one will be be given the DefinitionData pointer
1171    // at the end.
1172    Reader.PendingDefinitions.insert(D);
1173  } else {
1174    // Propagate DefinitionData pointer from the canonical declaration.
1175    D->DefinitionData = D->getCanonicalDecl()->DefinitionData;
1176  }
1177
1178  enum CXXRecKind {
1179    CXXRecNotTemplate = 0, CXXRecTemplate, CXXRecMemberSpecialization
1180  };
1181  switch ((CXXRecKind)Record[Idx++]) {
1182  case CXXRecNotTemplate:
1183    break;
1184  case CXXRecTemplate:
1185    D->TemplateOrInstantiation = ReadDeclAs<ClassTemplateDecl>(Record, Idx);
1186    break;
1187  case CXXRecMemberSpecialization: {
1188    CXXRecordDecl *RD = ReadDeclAs<CXXRecordDecl>(Record, Idx);
1189    TemplateSpecializationKind TSK = (TemplateSpecializationKind)Record[Idx++];
1190    SourceLocation POI = ReadSourceLocation(Record, Idx);
1191    MemberSpecializationInfo *MSI = new (C) MemberSpecializationInfo(RD, TSK);
1192    MSI->setPointOfInstantiation(POI);
1193    D->TemplateOrInstantiation = MSI;
1194    break;
1195  }
1196  }
1197
1198  // Load the key function to avoid deserializing every method so we can
1199  // compute it.
1200  if (D->IsCompleteDefinition) {
1201    if (CXXMethodDecl *Key = ReadDeclAs<CXXMethodDecl>(Record, Idx))
1202      C.KeyFunctions[D] = Key;
1203  }
1204}
1205
1206void ASTDeclReader::VisitCXXMethodDecl(CXXMethodDecl *D) {
1207  VisitFunctionDecl(D);
1208  unsigned NumOverridenMethods = Record[Idx++];
1209  while (NumOverridenMethods--) {
1210    // Avoid invariant checking of CXXMethodDecl::addOverriddenMethod,
1211    // MD may be initializing.
1212    if (CXXMethodDecl *MD = ReadDeclAs<CXXMethodDecl>(Record, Idx))
1213      Reader.getContext().addOverriddenMethod(D, MD);
1214  }
1215}
1216
1217void ASTDeclReader::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
1218  VisitCXXMethodDecl(D);
1219
1220  D->IsExplicitSpecified = Record[Idx++];
1221  D->ImplicitlyDefined = Record[Idx++];
1222  llvm::tie(D->CtorInitializers, D->NumCtorInitializers)
1223      = Reader.ReadCXXCtorInitializers(F, Record, Idx);
1224}
1225
1226void ASTDeclReader::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
1227  VisitCXXMethodDecl(D);
1228
1229  D->ImplicitlyDefined = Record[Idx++];
1230  D->OperatorDelete = ReadDeclAs<FunctionDecl>(Record, Idx);
1231}
1232
1233void ASTDeclReader::VisitCXXConversionDecl(CXXConversionDecl *D) {
1234  VisitCXXMethodDecl(D);
1235  D->IsExplicitSpecified = Record[Idx++];
1236}
1237
1238void ASTDeclReader::VisitImportDecl(ImportDecl *D) {
1239  VisitDecl(D);
1240  D->ImportedAndComplete.setPointer(readModule(Record, Idx));
1241  D->ImportedAndComplete.setInt(Record[Idx++]);
1242  SourceLocation *StoredLocs = reinterpret_cast<SourceLocation *>(D + 1);
1243  for (unsigned I = 0, N = Record.back(); I != N; ++I)
1244    StoredLocs[I] = ReadSourceLocation(Record, Idx);
1245  ++Idx;
1246}
1247
1248void ASTDeclReader::VisitAccessSpecDecl(AccessSpecDecl *D) {
1249  VisitDecl(D);
1250  D->setColonLoc(ReadSourceLocation(Record, Idx));
1251}
1252
1253void ASTDeclReader::VisitFriendDecl(FriendDecl *D) {
1254  VisitDecl(D);
1255  if (Record[Idx++])
1256    D->Friend = GetTypeSourceInfo(Record, Idx);
1257  else
1258    D->Friend = ReadDeclAs<NamedDecl>(Record, Idx);
1259  D->NextFriend = Record[Idx++];
1260  D->UnsupportedFriend = (Record[Idx++] != 0);
1261  D->FriendLoc = ReadSourceLocation(Record, Idx);
1262}
1263
1264void ASTDeclReader::VisitFriendTemplateDecl(FriendTemplateDecl *D) {
1265  VisitDecl(D);
1266  unsigned NumParams = Record[Idx++];
1267  D->NumParams = NumParams;
1268  D->Params = new TemplateParameterList*[NumParams];
1269  for (unsigned i = 0; i != NumParams; ++i)
1270    D->Params[i] = Reader.ReadTemplateParameterList(F, Record, Idx);
1271  if (Record[Idx++]) // HasFriendDecl
1272    D->Friend = ReadDeclAs<NamedDecl>(Record, Idx);
1273  else
1274    D->Friend = GetTypeSourceInfo(Record, Idx);
1275  D->FriendLoc = ReadSourceLocation(Record, Idx);
1276}
1277
1278void ASTDeclReader::VisitTemplateDecl(TemplateDecl *D) {
1279  VisitNamedDecl(D);
1280
1281  NamedDecl *TemplatedDecl = ReadDeclAs<NamedDecl>(Record, Idx);
1282  TemplateParameterList* TemplateParams
1283      = Reader.ReadTemplateParameterList(F, Record, Idx);
1284  D->init(TemplatedDecl, TemplateParams);
1285}
1286
1287ASTDeclReader::RedeclarableResult
1288ASTDeclReader::VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D) {
1289  RedeclarableResult Redecl = VisitRedeclarable(D);
1290
1291  // Make sure we've allocated the Common pointer first. We do this before
1292  // VisitTemplateDecl so that getCommonPtr() can be used during initialization.
1293  RedeclarableTemplateDecl *CanonD = D->getCanonicalDecl();
1294  if (!CanonD->Common) {
1295    CanonD->Common = CanonD->newCommon(Reader.getContext());
1296    Reader.PendingDefinitions.insert(CanonD);
1297  }
1298  D->Common = CanonD->Common;
1299
1300  // If this is the first declaration of the template, fill in the information
1301  // for the 'common' pointer.
1302  if (ThisDeclID == Redecl.getFirstID()) {
1303    if (RedeclarableTemplateDecl *RTD
1304          = ReadDeclAs<RedeclarableTemplateDecl>(Record, Idx)) {
1305      assert(RTD->getKind() == D->getKind() &&
1306             "InstantiatedFromMemberTemplate kind mismatch");
1307      D->setInstantiatedFromMemberTemplate(RTD);
1308      if (Record[Idx++])
1309        D->setMemberSpecialization();
1310    }
1311  }
1312
1313  VisitTemplateDecl(D);
1314  D->IdentifierNamespace = Record[Idx++];
1315
1316  return Redecl;
1317}
1318
1319void ASTDeclReader::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1320  RedeclarableResult Redecl = VisitRedeclarableTemplateDecl(D);
1321
1322  if (ThisDeclID == Redecl.getFirstID()) {
1323    // This ClassTemplateDecl owns a CommonPtr; read it to keep track of all of
1324    // the specializations.
1325    SmallVector<serialization::DeclID, 2> SpecIDs;
1326    SpecIDs.push_back(0);
1327
1328    // Specializations.
1329    unsigned Size = Record[Idx++];
1330    SpecIDs[0] += Size;
1331    for (unsigned I = 0; I != Size; ++I)
1332      SpecIDs.push_back(ReadDeclID(Record, Idx));
1333
1334    // Partial specializations.
1335    Size = Record[Idx++];
1336    SpecIDs[0] += Size;
1337    for (unsigned I = 0; I != Size; ++I)
1338      SpecIDs.push_back(ReadDeclID(Record, Idx));
1339
1340    if (SpecIDs[0]) {
1341      typedef serialization::DeclID DeclID;
1342
1343      ClassTemplateDecl::Common *CommonPtr = D->getCommonPtr();
1344      // FIXME: Append specializations!
1345      CommonPtr->LazySpecializations
1346        = new (Reader.getContext()) DeclID [SpecIDs.size()];
1347      memcpy(CommonPtr->LazySpecializations, SpecIDs.data(),
1348             SpecIDs.size() * sizeof(DeclID));
1349    }
1350
1351    // InjectedClassNameType is computed.
1352  }
1353}
1354
1355void ASTDeclReader::VisitClassTemplateSpecializationDecl(
1356                                           ClassTemplateSpecializationDecl *D) {
1357  VisitCXXRecordDecl(D);
1358
1359  ASTContext &C = Reader.getContext();
1360  if (Decl *InstD = ReadDecl(Record, Idx)) {
1361    if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(InstD)) {
1362      D->SpecializedTemplate = CTD;
1363    } else {
1364      SmallVector<TemplateArgument, 8> TemplArgs;
1365      Reader.ReadTemplateArgumentList(TemplArgs, F, Record, Idx);
1366      TemplateArgumentList *ArgList
1367        = TemplateArgumentList::CreateCopy(C, TemplArgs.data(),
1368                                           TemplArgs.size());
1369      ClassTemplateSpecializationDecl::SpecializedPartialSpecialization *PS
1370          = new (C) ClassTemplateSpecializationDecl::
1371                                             SpecializedPartialSpecialization();
1372      PS->PartialSpecialization
1373          = cast<ClassTemplatePartialSpecializationDecl>(InstD);
1374      PS->TemplateArgs = ArgList;
1375      D->SpecializedTemplate = PS;
1376    }
1377  }
1378
1379  // Explicit info.
1380  if (TypeSourceInfo *TyInfo = GetTypeSourceInfo(Record, Idx)) {
1381    ClassTemplateSpecializationDecl::ExplicitSpecializationInfo *ExplicitInfo
1382        = new (C) ClassTemplateSpecializationDecl::ExplicitSpecializationInfo;
1383    ExplicitInfo->TypeAsWritten = TyInfo;
1384    ExplicitInfo->ExternLoc = ReadSourceLocation(Record, Idx);
1385    ExplicitInfo->TemplateKeywordLoc = ReadSourceLocation(Record, Idx);
1386    D->ExplicitInfo = ExplicitInfo;
1387  }
1388
1389  SmallVector<TemplateArgument, 8> TemplArgs;
1390  Reader.ReadTemplateArgumentList(TemplArgs, F, Record, Idx);
1391  D->TemplateArgs = TemplateArgumentList::CreateCopy(C, TemplArgs.data(),
1392                                                     TemplArgs.size());
1393  D->PointOfInstantiation = ReadSourceLocation(Record, Idx);
1394  D->SpecializationKind = (TemplateSpecializationKind)Record[Idx++];
1395
1396  if (D->isCanonicalDecl()) { // It's kept in the folding set.
1397    ClassTemplateDecl *CanonPattern = ReadDeclAs<ClassTemplateDecl>(Record,Idx);
1398    if (ClassTemplatePartialSpecializationDecl *Partial
1399                       = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) {
1400      CanonPattern->getCommonPtr()->PartialSpecializations.InsertNode(Partial);
1401    } else {
1402      CanonPattern->getCommonPtr()->Specializations.InsertNode(D);
1403    }
1404  }
1405}
1406
1407void ASTDeclReader::VisitClassTemplatePartialSpecializationDecl(
1408                                    ClassTemplatePartialSpecializationDecl *D) {
1409  VisitClassTemplateSpecializationDecl(D);
1410
1411  ASTContext &C = Reader.getContext();
1412  D->TemplateParams = Reader.ReadTemplateParameterList(F, Record, Idx);
1413
1414  unsigned NumArgs = Record[Idx++];
1415  if (NumArgs) {
1416    D->NumArgsAsWritten = NumArgs;
1417    D->ArgsAsWritten = new (C) TemplateArgumentLoc[NumArgs];
1418    for (unsigned i=0; i != NumArgs; ++i)
1419      D->ArgsAsWritten[i] = Reader.ReadTemplateArgumentLoc(F, Record, Idx);
1420  }
1421
1422  D->SequenceNumber = Record[Idx++];
1423
1424  // These are read/set from/to the first declaration.
1425  if (D->getPreviousDecl() == 0) {
1426    D->InstantiatedFromMember.setPointer(
1427      ReadDeclAs<ClassTemplatePartialSpecializationDecl>(Record, Idx));
1428    D->InstantiatedFromMember.setInt(Record[Idx++]);
1429  }
1430}
1431
1432void ASTDeclReader::VisitClassScopeFunctionSpecializationDecl(
1433                                    ClassScopeFunctionSpecializationDecl *D) {
1434  VisitDecl(D);
1435  D->Specialization = ReadDeclAs<CXXMethodDecl>(Record, Idx);
1436}
1437
1438void ASTDeclReader::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1439  RedeclarableResult Redecl = VisitRedeclarableTemplateDecl(D);
1440
1441  if (ThisDeclID == Redecl.getFirstID()) {
1442    // This FunctionTemplateDecl owns a CommonPtr; read it.
1443
1444    // Read the function specialization declarations.
1445    // FunctionTemplateDecl's FunctionTemplateSpecializationInfos are filled
1446    // when reading the specialized FunctionDecl.
1447    unsigned NumSpecs = Record[Idx++];
1448    while (NumSpecs--)
1449      (void)ReadDecl(Record, Idx);
1450  }
1451}
1452
1453void ASTDeclReader::VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D) {
1454  VisitTypeDecl(D);
1455
1456  D->setDeclaredWithTypename(Record[Idx++]);
1457
1458  bool Inherited = Record[Idx++];
1459  TypeSourceInfo *DefArg = GetTypeSourceInfo(Record, Idx);
1460  D->setDefaultArgument(DefArg, Inherited);
1461}
1462
1463void ASTDeclReader::VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {
1464  VisitDeclaratorDecl(D);
1465  // TemplateParmPosition.
1466  D->setDepth(Record[Idx++]);
1467  D->setPosition(Record[Idx++]);
1468  if (D->isExpandedParameterPack()) {
1469    void **Data = reinterpret_cast<void **>(D + 1);
1470    for (unsigned I = 0, N = D->getNumExpansionTypes(); I != N; ++I) {
1471      Data[2*I] = Reader.readType(F, Record, Idx).getAsOpaquePtr();
1472      Data[2*I + 1] = GetTypeSourceInfo(Record, Idx);
1473    }
1474  } else {
1475    // Rest of NonTypeTemplateParmDecl.
1476    D->ParameterPack = Record[Idx++];
1477    if (Record[Idx++]) {
1478      Expr *DefArg = Reader.ReadExpr(F);
1479      bool Inherited = Record[Idx++];
1480      D->setDefaultArgument(DefArg, Inherited);
1481   }
1482  }
1483}
1484
1485void ASTDeclReader::VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D) {
1486  VisitTemplateDecl(D);
1487  // TemplateParmPosition.
1488  D->setDepth(Record[Idx++]);
1489  D->setPosition(Record[Idx++]);
1490  // Rest of TemplateTemplateParmDecl.
1491  TemplateArgumentLoc Arg = Reader.ReadTemplateArgumentLoc(F, Record, Idx);
1492  bool IsInherited = Record[Idx++];
1493  D->setDefaultArgument(Arg, IsInherited);
1494  D->ParameterPack = Record[Idx++];
1495}
1496
1497void ASTDeclReader::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) {
1498  VisitRedeclarableTemplateDecl(D);
1499}
1500
1501void ASTDeclReader::VisitStaticAssertDecl(StaticAssertDecl *D) {
1502  VisitDecl(D);
1503  D->AssertExpr = Reader.ReadExpr(F);
1504  D->Message = cast<StringLiteral>(Reader.ReadExpr(F));
1505  D->RParenLoc = ReadSourceLocation(Record, Idx);
1506}
1507
1508std::pair<uint64_t, uint64_t>
1509ASTDeclReader::VisitDeclContext(DeclContext *DC) {
1510  uint64_t LexicalOffset = Record[Idx++];
1511  uint64_t VisibleOffset = Record[Idx++];
1512  return std::make_pair(LexicalOffset, VisibleOffset);
1513}
1514
1515template <typename T>
1516ASTDeclReader::RedeclarableResult
1517ASTDeclReader::VisitRedeclarable(Redeclarable<T> *D) {
1518  DeclID FirstDeclID = ReadDeclID(Record, Idx);
1519
1520  // 0 indicates that this declaration was the only declaration of its entity,
1521  // and is used for space optimization.
1522  if (FirstDeclID == 0)
1523    FirstDeclID = ThisDeclID;
1524
1525  T *FirstDecl = cast_or_null<T>(Reader.GetDecl(FirstDeclID));
1526  if (FirstDecl != D) {
1527    // We delay loading of the redeclaration chain to avoid deeply nested calls.
1528    // We temporarily set the first (canonical) declaration as the previous one
1529    // which is the one that matters and mark the real previous DeclID to be
1530    // loaded & attached later on.
1531    D->RedeclLink = typename Redeclarable<T>::PreviousDeclLink(FirstDecl);
1532  }
1533
1534  // Note that this declaration has been deserialized.
1535  Reader.RedeclsDeserialized.insert(static_cast<T *>(D));
1536
1537  // The result structure takes care to note that we need to load the
1538  // other declaration chains for this ID.
1539  return RedeclarableResult(Reader, FirstDeclID);
1540}
1541
1542/// \brief Attempts to merge the given declaration (D) with another declaration
1543/// of the same entity.
1544template<typename T>
1545void ASTDeclReader::mergeRedeclarable(Redeclarable<T> *D,
1546                                      RedeclarableResult &Redecl) {
1547  // If modules are not available, there is no reason to perform this merge.
1548  if (!Reader.getContext().getLangOpts().Modules)
1549    return;
1550
1551  if (FindExistingResult ExistingRes = findExisting(static_cast<T*>(D))) {
1552    if (T *Existing = ExistingRes) {
1553      T *ExistingCanon = Existing->getCanonicalDecl();
1554      T *DCanon = static_cast<T*>(D)->getCanonicalDecl();
1555      if (ExistingCanon != DCanon) {
1556        // Have our redeclaration link point back at the canonical declaration
1557        // of the existing declaration, so that this declaration has the
1558        // appropriate canonical declaration.
1559        D->RedeclLink
1560          = typename Redeclarable<T>::PreviousDeclLink(ExistingCanon);
1561
1562        // When we merge a namespace, update its pointer to the first namespace.
1563        if (NamespaceDecl *Namespace
1564              = dyn_cast<NamespaceDecl>(static_cast<T*>(D))) {
1565          Namespace->AnonOrFirstNamespaceAndInline.setPointer(
1566            static_cast<NamespaceDecl *>(static_cast<void*>(ExistingCanon)));
1567        }
1568
1569        // Don't introduce DCanon into the set of pending declaration chains.
1570        Redecl.suppress();
1571
1572        // Introduce ExistingCanon into the set of pending declaration chains,
1573        // if in fact it came from a module file.
1574        if (ExistingCanon->isFromASTFile()) {
1575          GlobalDeclID ExistingCanonID = ExistingCanon->getGlobalID();
1576          assert(ExistingCanonID && "Unrecorded canonical declaration ID?");
1577          if (Reader.PendingDeclChainsKnown.insert(ExistingCanonID))
1578            Reader.PendingDeclChains.push_back(ExistingCanonID);
1579        }
1580
1581        // If this declaration was the canonical declaration, make a note of
1582        // that. We accept the linear algorithm here because the number of
1583        // unique canonical declarations of an entity should always be tiny.
1584        if (DCanon == static_cast<T*>(D)) {
1585          SmallVectorImpl<DeclID> &Merged = Reader.MergedDecls[ExistingCanon];
1586          if (std::find(Merged.begin(), Merged.end(), Redecl.getFirstID())
1587                == Merged.end())
1588            Merged.push_back(Redecl.getFirstID());
1589
1590          // If ExistingCanon did not come from a module file, introduce the
1591          // first declaration that *does* come from a module file to the
1592          // set of pending declaration chains, so that we merge this
1593          // declaration.
1594          if (!ExistingCanon->isFromASTFile() &&
1595              Reader.PendingDeclChainsKnown.insert(Redecl.getFirstID()))
1596            Reader.PendingDeclChains.push_back(Merged[0]);
1597        }
1598      }
1599    }
1600  }
1601}
1602
1603//===----------------------------------------------------------------------===//
1604// Attribute Reading
1605//===----------------------------------------------------------------------===//
1606
1607/// \brief Reads attributes from the current stream position.
1608void ASTReader::ReadAttributes(ModuleFile &F, AttrVec &Attrs,
1609                               const RecordData &Record, unsigned &Idx) {
1610  for (unsigned i = 0, e = Record[Idx++]; i != e; ++i) {
1611    Attr *New = 0;
1612    attr::Kind Kind = (attr::Kind)Record[Idx++];
1613    SourceRange Range = ReadSourceRange(F, Record, Idx);
1614
1615#include "clang/Serialization/AttrPCHRead.inc"
1616
1617    assert(New && "Unable to decode attribute?");
1618    Attrs.push_back(New);
1619  }
1620}
1621
1622//===----------------------------------------------------------------------===//
1623// ASTReader Implementation
1624//===----------------------------------------------------------------------===//
1625
1626/// \brief Note that we have loaded the declaration with the given
1627/// Index.
1628///
1629/// This routine notes that this declaration has already been loaded,
1630/// so that future GetDecl calls will return this declaration rather
1631/// than trying to load a new declaration.
1632inline void ASTReader::LoadedDecl(unsigned Index, Decl *D) {
1633  assert(!DeclsLoaded[Index] && "Decl loaded twice?");
1634  DeclsLoaded[Index] = D;
1635}
1636
1637
1638/// \brief Determine whether the consumer will be interested in seeing
1639/// this declaration (via HandleTopLevelDecl).
1640///
1641/// This routine should return true for anything that might affect
1642/// code generation, e.g., inline function definitions, Objective-C
1643/// declarations with metadata, etc.
1644static bool isConsumerInterestedIn(Decl *D) {
1645  // An ObjCMethodDecl is never considered as "interesting" because its
1646  // implementation container always is.
1647
1648  if (isa<FileScopeAsmDecl>(D) ||
1649      isa<ObjCProtocolDecl>(D) ||
1650      isa<ObjCImplDecl>(D))
1651    return true;
1652  if (VarDecl *Var = dyn_cast<VarDecl>(D))
1653    return Var->isFileVarDecl() &&
1654           Var->isThisDeclarationADefinition() == VarDecl::Definition;
1655  if (FunctionDecl *Func = dyn_cast<FunctionDecl>(D))
1656    return Func->doesThisDeclarationHaveABody();
1657
1658  return false;
1659}
1660
1661/// \brief Get the correct cursor and offset for loading a declaration.
1662ASTReader::RecordLocation
1663ASTReader::DeclCursorForID(DeclID ID, unsigned &RawLocation) {
1664  // See if there's an override.
1665  DeclReplacementMap::iterator It = ReplacedDecls.find(ID);
1666  if (It != ReplacedDecls.end()) {
1667    RawLocation = It->second.RawLoc;
1668    return RecordLocation(It->second.Mod, It->second.Offset);
1669  }
1670
1671  GlobalDeclMapType::iterator I = GlobalDeclMap.find(ID);
1672  assert(I != GlobalDeclMap.end() && "Corrupted global declaration map");
1673  ModuleFile *M = I->second;
1674  const DeclOffset &
1675    DOffs =  M->DeclOffsets[ID - M->BaseDeclID - NUM_PREDEF_DECL_IDS];
1676  RawLocation = DOffs.Loc;
1677  return RecordLocation(M, DOffs.BitOffset);
1678}
1679
1680ASTReader::RecordLocation ASTReader::getLocalBitOffset(uint64_t GlobalOffset) {
1681  ContinuousRangeMap<uint64_t, ModuleFile*, 4>::iterator I
1682    = GlobalBitOffsetsMap.find(GlobalOffset);
1683
1684  assert(I != GlobalBitOffsetsMap.end() && "Corrupted global bit offsets map");
1685  return RecordLocation(I->second, GlobalOffset - I->second->GlobalBitOffset);
1686}
1687
1688uint64_t ASTReader::getGlobalBitOffset(ModuleFile &M, uint32_t LocalOffset) {
1689  return LocalOffset + M.GlobalBitOffset;
1690}
1691
1692/// \brief Determine whether the two declarations refer to the same entity.
1693static bool isSameEntity(NamedDecl *X, NamedDecl *Y) {
1694  assert(X->getDeclName() == Y->getDeclName() && "Declaration name mismatch!");
1695
1696  if (X == Y)
1697    return true;
1698
1699  // Must be in the same context.
1700  if (!X->getDeclContext()->getRedeclContext()->Equals(
1701         Y->getDeclContext()->getRedeclContext()))
1702    return false;
1703
1704  // Two typedefs refer to the same entity if they have the same underlying
1705  // type.
1706  if (TypedefNameDecl *TypedefX = dyn_cast<TypedefNameDecl>(X))
1707    if (TypedefNameDecl *TypedefY = dyn_cast<TypedefNameDecl>(Y))
1708      return X->getASTContext().hasSameType(TypedefX->getUnderlyingType(),
1709                                            TypedefY->getUnderlyingType());
1710
1711  // Must have the same kind.
1712  if (X->getKind() != Y->getKind())
1713    return false;
1714
1715  // Objective-C classes and protocols with the same name always match.
1716  if (isa<ObjCInterfaceDecl>(X) || isa<ObjCProtocolDecl>(X))
1717    return true;
1718
1719  // Compatible tags match.
1720  if (TagDecl *TagX = dyn_cast<TagDecl>(X)) {
1721    TagDecl *TagY = cast<TagDecl>(Y);
1722    return (TagX->getTagKind() == TagY->getTagKind()) ||
1723      ((TagX->getTagKind() == TTK_Struct || TagX->getTagKind() == TTK_Class) &&
1724       (TagY->getTagKind() == TTK_Struct || TagY->getTagKind() == TTK_Class));
1725  }
1726
1727  // Functions with the same type and linkage match.
1728  // FIXME: This needs to cope with function templates, merging of
1729  //prototyped/non-prototyped functions, etc.
1730  if (FunctionDecl *FuncX = dyn_cast<FunctionDecl>(X)) {
1731    FunctionDecl *FuncY = cast<FunctionDecl>(Y);
1732    return (FuncX->getLinkage() == FuncY->getLinkage()) &&
1733      FuncX->getASTContext().hasSameType(FuncX->getType(), FuncY->getType());
1734  }
1735
1736  // Variables with the same type and linkage match.
1737  if (VarDecl *VarX = dyn_cast<VarDecl>(X)) {
1738    VarDecl *VarY = cast<VarDecl>(Y);
1739    return (VarX->getLinkage() == VarY->getLinkage()) &&
1740      VarX->getASTContext().hasSameType(VarX->getType(), VarY->getType());
1741  }
1742
1743  // Namespaces with the same name and inlinedness match.
1744  if (NamespaceDecl *NamespaceX = dyn_cast<NamespaceDecl>(X)) {
1745    NamespaceDecl *NamespaceY = cast<NamespaceDecl>(Y);
1746    return NamespaceX->isInline() == NamespaceY->isInline();
1747  }
1748
1749  // FIXME: Many other cases to implement.
1750  return false;
1751}
1752
1753ASTDeclReader::FindExistingResult::~FindExistingResult() {
1754  if (!AddResult || Existing)
1755    return;
1756
1757  DeclContext *DC = New->getDeclContext()->getRedeclContext();
1758  if (DC->isTranslationUnit() && Reader.SemaObj) {
1759    Reader.SemaObj->IdResolver.tryAddTopLevelDecl(New, New->getDeclName());
1760  } else if (DC->isNamespace()) {
1761    DC->addDecl(New);
1762  }
1763}
1764
1765ASTDeclReader::FindExistingResult ASTDeclReader::findExisting(NamedDecl *D) {
1766  DeclarationName Name = D->getDeclName();
1767  if (!Name) {
1768    // Don't bother trying to find unnamed declarations.
1769    FindExistingResult Result(Reader, D, /*Existing=*/0);
1770    Result.suppress();
1771    return Result;
1772  }
1773
1774  DeclContext *DC = D->getDeclContext()->getRedeclContext();
1775  if (!DC->isFileContext())
1776    return FindExistingResult(Reader);
1777
1778  if (DC->isTranslationUnit() && Reader.SemaObj) {
1779    IdentifierResolver &IdResolver = Reader.SemaObj->IdResolver;
1780    for (IdentifierResolver::iterator I = IdResolver.begin(Name),
1781                                   IEnd = IdResolver.end();
1782         I != IEnd; ++I) {
1783      if (isSameEntity(*I, D))
1784        return FindExistingResult(Reader, D, *I);
1785    }
1786  }
1787
1788  if (DC->isNamespace()) {
1789    for (DeclContext::lookup_result R = DC->lookup(Name);
1790         R.first != R.second; ++R.first) {
1791      if (isSameEntity(*R.first, D))
1792        return FindExistingResult(Reader, D, *R.first);
1793    }
1794  }
1795
1796  return FindExistingResult(Reader, D, /*Existing=*/0);
1797}
1798
1799void ASTDeclReader::attachPreviousDecl(Decl *D, Decl *previous) {
1800  assert(D && previous);
1801  if (TagDecl *TD = dyn_cast<TagDecl>(D)) {
1802    TD->RedeclLink.setPointer(cast<TagDecl>(previous));
1803  } else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
1804    FD->RedeclLink.setPointer(cast<FunctionDecl>(previous));
1805  } else if (VarDecl *VD = dyn_cast<VarDecl>(D)) {
1806    VD->RedeclLink.setPointer(cast<VarDecl>(previous));
1807  } else if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) {
1808    TD->RedeclLink.setPointer(cast<TypedefNameDecl>(previous));
1809  } else if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(D)) {
1810    ID->RedeclLink.setPointer(cast<ObjCInterfaceDecl>(previous));
1811  } else if (ObjCProtocolDecl *PD = dyn_cast<ObjCProtocolDecl>(D)) {
1812    PD->RedeclLink.setPointer(cast<ObjCProtocolDecl>(previous));
1813  } else if (NamespaceDecl *ND = dyn_cast<NamespaceDecl>(D)) {
1814    ND->RedeclLink.setPointer(cast<NamespaceDecl>(previous));
1815  } else {
1816    RedeclarableTemplateDecl *TD = cast<RedeclarableTemplateDecl>(D);
1817    TD->RedeclLink.setPointer(cast<RedeclarableTemplateDecl>(previous));
1818  }
1819}
1820
1821void ASTDeclReader::attachLatestDecl(Decl *D, Decl *Latest) {
1822  assert(D && Latest);
1823  if (TagDecl *TD = dyn_cast<TagDecl>(D)) {
1824    TD->RedeclLink
1825      = Redeclarable<TagDecl>::LatestDeclLink(cast<TagDecl>(Latest));
1826  } else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
1827    FD->RedeclLink
1828      = Redeclarable<FunctionDecl>::LatestDeclLink(cast<FunctionDecl>(Latest));
1829  } else if (VarDecl *VD = dyn_cast<VarDecl>(D)) {
1830    VD->RedeclLink
1831      = Redeclarable<VarDecl>::LatestDeclLink(cast<VarDecl>(Latest));
1832  } else if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D)) {
1833    TD->RedeclLink
1834      = Redeclarable<TypedefNameDecl>::LatestDeclLink(
1835                                                cast<TypedefNameDecl>(Latest));
1836  } else if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(D)) {
1837    ID->RedeclLink
1838      = Redeclarable<ObjCInterfaceDecl>::LatestDeclLink(
1839                                              cast<ObjCInterfaceDecl>(Latest));
1840  } else if (ObjCProtocolDecl *PD = dyn_cast<ObjCProtocolDecl>(D)) {
1841    PD->RedeclLink
1842      = Redeclarable<ObjCProtocolDecl>::LatestDeclLink(
1843                                                cast<ObjCProtocolDecl>(Latest));
1844  } else if (NamespaceDecl *ND = dyn_cast<NamespaceDecl>(D)) {
1845    ND->RedeclLink
1846      = Redeclarable<NamespaceDecl>::LatestDeclLink(
1847                                                   cast<NamespaceDecl>(Latest));
1848  } else {
1849    RedeclarableTemplateDecl *TD = cast<RedeclarableTemplateDecl>(D);
1850    TD->RedeclLink
1851      = Redeclarable<RedeclarableTemplateDecl>::LatestDeclLink(
1852                                        cast<RedeclarableTemplateDecl>(Latest));
1853  }
1854}
1855
1856ASTReader::MergedDeclsMap::iterator
1857ASTReader::combineStoredMergedDecls(Decl *Canon, GlobalDeclID CanonID) {
1858  // If we don't have any stored merged declarations, just look in the
1859  // merged declarations set.
1860  StoredMergedDeclsMap::iterator StoredPos = StoredMergedDecls.find(CanonID);
1861  if (StoredPos == StoredMergedDecls.end())
1862    return MergedDecls.find(Canon);
1863
1864  // Append the stored merged declarations to the merged declarations set.
1865  MergedDeclsMap::iterator Pos = MergedDecls.find(Canon);
1866  if (Pos == MergedDecls.end())
1867    Pos = MergedDecls.insert(std::make_pair(Canon,
1868                                            SmallVector<DeclID, 2>())).first;
1869  Pos->second.append(StoredPos->second.begin(), StoredPos->second.end());
1870  StoredMergedDecls.erase(StoredPos);
1871
1872  // Sort and uniquify the set of merged declarations.
1873  llvm::array_pod_sort(Pos->second.begin(), Pos->second.end());
1874  Pos->second.erase(std::unique(Pos->second.begin(), Pos->second.end()),
1875                    Pos->second.end());
1876  return Pos;
1877}
1878
1879void ASTReader::loadAndAttachPreviousDecl(Decl *D, serialization::DeclID ID) {
1880  Decl *previous = GetDecl(ID);
1881  ASTDeclReader::attachPreviousDecl(D, previous);
1882}
1883
1884/// \brief Read the declaration at the given offset from the AST file.
1885Decl *ASTReader::ReadDeclRecord(DeclID ID) {
1886  unsigned Index = ID - NUM_PREDEF_DECL_IDS;
1887  unsigned RawLocation = 0;
1888  RecordLocation Loc = DeclCursorForID(ID, RawLocation);
1889  llvm::BitstreamCursor &DeclsCursor = Loc.F->DeclsCursor;
1890  // Keep track of where we are in the stream, then jump back there
1891  // after reading this declaration.
1892  SavedStreamPosition SavedPosition(DeclsCursor);
1893
1894  ReadingKindTracker ReadingKind(Read_Decl, *this);
1895
1896  // Note that we are loading a declaration record.
1897  Deserializing ADecl(this);
1898
1899  DeclsCursor.JumpToBit(Loc.Offset);
1900  RecordData Record;
1901  unsigned Code = DeclsCursor.ReadCode();
1902  unsigned Idx = 0;
1903  ASTDeclReader Reader(*this, *Loc.F, DeclsCursor, ID, RawLocation, Record,Idx);
1904
1905  Decl *D = 0;
1906  switch ((DeclCode)DeclsCursor.ReadRecord(Code, Record)) {
1907  case DECL_CONTEXT_LEXICAL:
1908  case DECL_CONTEXT_VISIBLE:
1909    llvm_unreachable("Record cannot be de-serialized with ReadDeclRecord");
1910  case DECL_TYPEDEF:
1911    D = TypedefDecl::CreateDeserialized(Context, ID);
1912    break;
1913  case DECL_TYPEALIAS:
1914    D = TypeAliasDecl::CreateDeserialized(Context, ID);
1915    break;
1916  case DECL_ENUM:
1917    D = EnumDecl::CreateDeserialized(Context, ID);
1918    break;
1919  case DECL_RECORD:
1920    D = RecordDecl::CreateDeserialized(Context, ID);
1921    break;
1922  case DECL_ENUM_CONSTANT:
1923    D = EnumConstantDecl::CreateDeserialized(Context, ID);
1924    break;
1925  case DECL_FUNCTION:
1926    D = FunctionDecl::CreateDeserialized(Context, ID);
1927    break;
1928  case DECL_LINKAGE_SPEC:
1929    D = LinkageSpecDecl::CreateDeserialized(Context, ID);
1930    break;
1931  case DECL_LABEL:
1932    D = LabelDecl::CreateDeserialized(Context, ID);
1933    break;
1934  case DECL_NAMESPACE:
1935    D = NamespaceDecl::CreateDeserialized(Context, ID);
1936    break;
1937  case DECL_NAMESPACE_ALIAS:
1938    D = NamespaceAliasDecl::CreateDeserialized(Context, ID);
1939    break;
1940  case DECL_USING:
1941    D = UsingDecl::CreateDeserialized(Context, ID);
1942    break;
1943  case DECL_USING_SHADOW:
1944    D = UsingShadowDecl::CreateDeserialized(Context, ID);
1945    break;
1946  case DECL_USING_DIRECTIVE:
1947    D = UsingDirectiveDecl::CreateDeserialized(Context, ID);
1948    break;
1949  case DECL_UNRESOLVED_USING_VALUE:
1950    D = UnresolvedUsingValueDecl::CreateDeserialized(Context, ID);
1951    break;
1952  case DECL_UNRESOLVED_USING_TYPENAME:
1953    D = UnresolvedUsingTypenameDecl::CreateDeserialized(Context, ID);
1954    break;
1955  case DECL_CXX_RECORD:
1956    D = CXXRecordDecl::CreateDeserialized(Context, ID);
1957    break;
1958  case DECL_CXX_METHOD:
1959    D = CXXMethodDecl::CreateDeserialized(Context, ID);
1960    break;
1961  case DECL_CXX_CONSTRUCTOR:
1962    D = CXXConstructorDecl::CreateDeserialized(Context, ID);
1963    break;
1964  case DECL_CXX_DESTRUCTOR:
1965    D = CXXDestructorDecl::CreateDeserialized(Context, ID);
1966    break;
1967  case DECL_CXX_CONVERSION:
1968    D = CXXConversionDecl::CreateDeserialized(Context, ID);
1969    break;
1970  case DECL_ACCESS_SPEC:
1971    D = AccessSpecDecl::CreateDeserialized(Context, ID);
1972    break;
1973  case DECL_FRIEND:
1974    D = FriendDecl::CreateDeserialized(Context, ID);
1975    break;
1976  case DECL_FRIEND_TEMPLATE:
1977    D = FriendTemplateDecl::CreateDeserialized(Context, ID);
1978    break;
1979  case DECL_CLASS_TEMPLATE:
1980    D = ClassTemplateDecl::CreateDeserialized(Context, ID);
1981    break;
1982  case DECL_CLASS_TEMPLATE_SPECIALIZATION:
1983    D = ClassTemplateSpecializationDecl::CreateDeserialized(Context, ID);
1984    break;
1985  case DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION:
1986    D = ClassTemplatePartialSpecializationDecl::CreateDeserialized(Context, ID);
1987    break;
1988  case DECL_CLASS_SCOPE_FUNCTION_SPECIALIZATION:
1989    D = ClassScopeFunctionSpecializationDecl::CreateDeserialized(Context, ID);
1990    break;
1991  case DECL_FUNCTION_TEMPLATE:
1992    D = FunctionTemplateDecl::CreateDeserialized(Context, ID);
1993    break;
1994  case DECL_TEMPLATE_TYPE_PARM:
1995    D = TemplateTypeParmDecl::CreateDeserialized(Context, ID);
1996    break;
1997  case DECL_NON_TYPE_TEMPLATE_PARM:
1998    D = NonTypeTemplateParmDecl::CreateDeserialized(Context, ID);
1999    break;
2000  case DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK:
2001    D = NonTypeTemplateParmDecl::CreateDeserialized(Context, ID, Record[Idx++]);
2002    break;
2003  case DECL_TEMPLATE_TEMPLATE_PARM:
2004    D = TemplateTemplateParmDecl::CreateDeserialized(Context, ID);
2005    break;
2006  case DECL_TYPE_ALIAS_TEMPLATE:
2007    D = TypeAliasTemplateDecl::CreateDeserialized(Context, ID);
2008    break;
2009  case DECL_STATIC_ASSERT:
2010    D = StaticAssertDecl::CreateDeserialized(Context, ID);
2011    break;
2012  case DECL_OBJC_METHOD:
2013    D = ObjCMethodDecl::CreateDeserialized(Context, ID);
2014    break;
2015  case DECL_OBJC_INTERFACE:
2016    D = ObjCInterfaceDecl::CreateDeserialized(Context, ID);
2017    break;
2018  case DECL_OBJC_IVAR:
2019    D = ObjCIvarDecl::CreateDeserialized(Context, ID);
2020    break;
2021  case DECL_OBJC_PROTOCOL:
2022    D = ObjCProtocolDecl::CreateDeserialized(Context, ID);
2023    break;
2024  case DECL_OBJC_AT_DEFS_FIELD:
2025    D = ObjCAtDefsFieldDecl::CreateDeserialized(Context, ID);
2026    break;
2027  case DECL_OBJC_CATEGORY:
2028    D = ObjCCategoryDecl::CreateDeserialized(Context, ID);
2029    break;
2030  case DECL_OBJC_CATEGORY_IMPL:
2031    D = ObjCCategoryImplDecl::CreateDeserialized(Context, ID);
2032    break;
2033  case DECL_OBJC_IMPLEMENTATION:
2034    D = ObjCImplementationDecl::CreateDeserialized(Context, ID);
2035    break;
2036  case DECL_OBJC_COMPATIBLE_ALIAS:
2037    D = ObjCCompatibleAliasDecl::CreateDeserialized(Context, ID);
2038    break;
2039  case DECL_OBJC_PROPERTY:
2040    D = ObjCPropertyDecl::CreateDeserialized(Context, ID);
2041    break;
2042  case DECL_OBJC_PROPERTY_IMPL:
2043    D = ObjCPropertyImplDecl::CreateDeserialized(Context, ID);
2044    break;
2045  case DECL_FIELD:
2046    D = FieldDecl::CreateDeserialized(Context, ID);
2047    break;
2048  case DECL_INDIRECTFIELD:
2049    D = IndirectFieldDecl::CreateDeserialized(Context, ID);
2050    break;
2051  case DECL_VAR:
2052    D = VarDecl::CreateDeserialized(Context, ID);
2053    break;
2054  case DECL_IMPLICIT_PARAM:
2055    D = ImplicitParamDecl::CreateDeserialized(Context, ID);
2056    break;
2057  case DECL_PARM_VAR:
2058    D = ParmVarDecl::CreateDeserialized(Context, ID);
2059    break;
2060  case DECL_FILE_SCOPE_ASM:
2061    D = FileScopeAsmDecl::CreateDeserialized(Context, ID);
2062    break;
2063  case DECL_BLOCK:
2064    D = BlockDecl::CreateDeserialized(Context, ID);
2065    break;
2066  case DECL_CXX_BASE_SPECIFIERS:
2067    Error("attempt to read a C++ base-specifier record as a declaration");
2068    return 0;
2069  case DECL_IMPORT:
2070    // Note: last entry of the ImportDecl record is the number of stored source
2071    // locations.
2072    D = ImportDecl::CreateDeserialized(Context, ID, Record.back());
2073    break;
2074  }
2075
2076  assert(D && "Unknown declaration reading AST file");
2077  LoadedDecl(Index, D);
2078  // Set the DeclContext before doing any deserialization, to make sure internal
2079  // calls to Decl::getASTContext() by Decl's methods will find the
2080  // TranslationUnitDecl without crashing.
2081  D->setDeclContext(Context.getTranslationUnitDecl());
2082  Reader.Visit(D);
2083
2084  // If this declaration is also a declaration context, get the
2085  // offsets for its tables of lexical and visible declarations.
2086  if (DeclContext *DC = dyn_cast<DeclContext>(D)) {
2087    std::pair<uint64_t, uint64_t> Offsets = Reader.VisitDeclContext(DC);
2088    if (Offsets.first || Offsets.second) {
2089      if (Offsets.first != 0)
2090        DC->setHasExternalLexicalStorage(true);
2091      if (Offsets.second != 0)
2092        DC->setHasExternalVisibleStorage(true);
2093      if (ReadDeclContextStorage(*Loc.F, DeclsCursor, Offsets,
2094                                 Loc.F->DeclContextInfos[DC]))
2095        return 0;
2096    }
2097
2098    // Now add the pending visible updates for this decl context, if it has any.
2099    DeclContextVisibleUpdatesPending::iterator I =
2100        PendingVisibleUpdates.find(ID);
2101    if (I != PendingVisibleUpdates.end()) {
2102      // There are updates. This means the context has external visible
2103      // storage, even if the original stored version didn't.
2104      DC->setHasExternalVisibleStorage(true);
2105      DeclContextVisibleUpdates &U = I->second;
2106      for (DeclContextVisibleUpdates::iterator UI = U.begin(), UE = U.end();
2107           UI != UE; ++UI) {
2108        DeclContextInfo &Info = UI->second->DeclContextInfos[DC];
2109        delete Info.NameLookupTableData;
2110        Info.NameLookupTableData = UI->first;
2111      }
2112      PendingVisibleUpdates.erase(I);
2113    }
2114  }
2115  assert(Idx == Record.size());
2116
2117  // Load any relevant update records.
2118  loadDeclUpdateRecords(ID, D);
2119
2120  // Load the categories after recursive loading is finished.
2121  if (ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(D))
2122    if (Class->isThisDeclarationADefinition())
2123      loadObjCCategories(ID, Class);
2124
2125  // If we have deserialized a declaration that has a definition the
2126  // AST consumer might need to know about, queue it.
2127  // We don't pass it to the consumer immediately because we may be in recursive
2128  // loading, and some declarations may still be initializing.
2129  if (isConsumerInterestedIn(D))
2130    InterestingDecls.push_back(D);
2131
2132  return D;
2133}
2134
2135void ASTReader::loadDeclUpdateRecords(serialization::DeclID ID, Decl *D) {
2136  // The declaration may have been modified by files later in the chain.
2137  // If this is the case, read the record containing the updates from each file
2138  // and pass it to ASTDeclReader to make the modifications.
2139  DeclUpdateOffsetsMap::iterator UpdI = DeclUpdateOffsets.find(ID);
2140  if (UpdI != DeclUpdateOffsets.end()) {
2141    FileOffsetsTy &UpdateOffsets = UpdI->second;
2142    for (FileOffsetsTy::iterator
2143         I = UpdateOffsets.begin(), E = UpdateOffsets.end(); I != E; ++I) {
2144      ModuleFile *F = I->first;
2145      uint64_t Offset = I->second;
2146      llvm::BitstreamCursor &Cursor = F->DeclsCursor;
2147      SavedStreamPosition SavedPosition(Cursor);
2148      Cursor.JumpToBit(Offset);
2149      RecordData Record;
2150      unsigned Code = Cursor.ReadCode();
2151      unsigned RecCode = Cursor.ReadRecord(Code, Record);
2152      (void)RecCode;
2153      assert(RecCode == DECL_UPDATES && "Expected DECL_UPDATES record!");
2154
2155      unsigned Idx = 0;
2156      ASTDeclReader Reader(*this, *F, Cursor, ID, 0, Record, Idx);
2157      Reader.UpdateDecl(D, *F, Record);
2158    }
2159  }
2160}
2161
2162namespace {
2163  struct CompareLocalRedeclarationsInfoToID {
2164    bool operator()(const LocalRedeclarationsInfo &X, DeclID Y) {
2165      return X.FirstID < Y;
2166    }
2167
2168    bool operator()(DeclID X, const LocalRedeclarationsInfo &Y) {
2169      return X < Y.FirstID;
2170    }
2171
2172    bool operator()(const LocalRedeclarationsInfo &X,
2173                    const LocalRedeclarationsInfo &Y) {
2174      return X.FirstID < Y.FirstID;
2175    }
2176    bool operator()(DeclID X, DeclID Y) {
2177      return X < Y;
2178    }
2179  };
2180
2181  /// \brief Module visitor class that finds all of the redeclarations of a
2182  ///
2183  class RedeclChainVisitor {
2184    ASTReader &Reader;
2185    SmallVectorImpl<DeclID> &SearchDecls;
2186    llvm::SmallPtrSet<Decl *, 16> &Deserialized;
2187    GlobalDeclID CanonID;
2188    llvm::SmallVector<Decl *, 4> Chain;
2189
2190  public:
2191    RedeclChainVisitor(ASTReader &Reader, SmallVectorImpl<DeclID> &SearchDecls,
2192                       llvm::SmallPtrSet<Decl *, 16> &Deserialized,
2193                       GlobalDeclID CanonID)
2194      : Reader(Reader), SearchDecls(SearchDecls), Deserialized(Deserialized),
2195        CanonID(CanonID) {
2196      for (unsigned I = 0, N = SearchDecls.size(); I != N; ++I)
2197        addToChain(Reader.GetDecl(SearchDecls[I]));
2198    }
2199
2200    static bool visit(ModuleFile &M, bool Preorder, void *UserData) {
2201      if (Preorder)
2202        return false;
2203
2204      return static_cast<RedeclChainVisitor *>(UserData)->visit(M);
2205    }
2206
2207    void addToChain(Decl *D) {
2208      if (!D)
2209        return;
2210
2211      if (Deserialized.count(D)) {
2212        Deserialized.erase(D);
2213        Chain.push_back(D);
2214      }
2215    }
2216
2217    void searchForID(ModuleFile &M, GlobalDeclID GlobalID) {
2218      // Map global ID of the first declaration down to the local ID
2219      // used in this module file.
2220      DeclID ID = Reader.mapGlobalIDToModuleFileGlobalID(M, GlobalID);
2221      if (!ID)
2222        return;
2223
2224      // Perform a binary search to find the local redeclarations for this
2225      // declaration (if any).
2226      const LocalRedeclarationsInfo *Result
2227        = std::lower_bound(M.RedeclarationsMap,
2228                           M.RedeclarationsMap + M.LocalNumRedeclarationsInMap,
2229                           ID, CompareLocalRedeclarationsInfoToID());
2230      if (Result == M.RedeclarationsMap + M.LocalNumRedeclarationsInMap ||
2231          Result->FirstID != ID) {
2232        // If we have a previously-canonical singleton declaration that was
2233        // merged into another redeclaration chain, create a trivial chain
2234        // for this single declaration so that it will get wired into the
2235        // complete redeclaration chain.
2236        if (GlobalID != CanonID &&
2237            GlobalID - NUM_PREDEF_DECL_IDS >= M.BaseDeclID &&
2238            GlobalID - NUM_PREDEF_DECL_IDS < M.BaseDeclID + M.LocalNumDecls) {
2239          addToChain(Reader.GetDecl(GlobalID));
2240        }
2241
2242        return;
2243      }
2244
2245      // Dig out all of the redeclarations.
2246      unsigned Offset = Result->Offset;
2247      unsigned N = M.RedeclarationChains[Offset];
2248      M.RedeclarationChains[Offset++] = 0; // Don't try to deserialize again
2249      for (unsigned I = 0; I != N; ++I)
2250        addToChain(Reader.GetLocalDecl(M, M.RedeclarationChains[Offset++]));
2251    }
2252
2253    bool visit(ModuleFile &M) {
2254      // Visit each of the declarations.
2255      for (unsigned I = 0, N = SearchDecls.size(); I != N; ++I)
2256        searchForID(M, SearchDecls[I]);
2257      return false;
2258    }
2259
2260    ArrayRef<Decl *> getChain() const {
2261      return Chain;
2262    }
2263  };
2264}
2265
2266void ASTReader::loadPendingDeclChain(serialization::GlobalDeclID ID) {
2267  Decl *D = GetDecl(ID);
2268  Decl *CanonDecl = D->getCanonicalDecl();
2269
2270  // Determine the set of declaration IDs we'll be searching for.
2271  llvm::SmallVector<DeclID, 1> SearchDecls;
2272  GlobalDeclID CanonID = 0;
2273  if (D == CanonDecl) {
2274    SearchDecls.push_back(ID); // Always first.
2275    CanonID = ID;
2276  }
2277  MergedDeclsMap::iterator MergedPos = combineStoredMergedDecls(CanonDecl, ID);
2278  if (MergedPos != MergedDecls.end())
2279    SearchDecls.append(MergedPos->second.begin(), MergedPos->second.end());
2280
2281  // Build up the list of redeclarations.
2282  RedeclChainVisitor Visitor(*this, SearchDecls, RedeclsDeserialized, CanonID);
2283  ModuleMgr.visitDepthFirst(&RedeclChainVisitor::visit, &Visitor);
2284
2285  // Retrieve the chains.
2286  ArrayRef<Decl *> Chain = Visitor.getChain();
2287  if (Chain.empty())
2288    return;
2289
2290  // Hook up the chains.
2291  Decl *MostRecent = CanonDecl->getMostRecentDecl();
2292  for (unsigned I = 0, N = Chain.size(); I != N; ++I) {
2293    if (Chain[I] == CanonDecl)
2294      continue;
2295
2296    ASTDeclReader::attachPreviousDecl(Chain[I], MostRecent);
2297    MostRecent = Chain[I];
2298  }
2299
2300  ASTDeclReader::attachLatestDecl(CanonDecl, MostRecent);
2301}
2302
2303namespace {
2304  struct CompareObjCCategoriesInfo {
2305    bool operator()(const ObjCCategoriesInfo &X, DeclID Y) {
2306      return X.DefinitionID < Y;
2307    }
2308
2309    bool operator()(DeclID X, const ObjCCategoriesInfo &Y) {
2310      return X < Y.DefinitionID;
2311    }
2312
2313    bool operator()(const ObjCCategoriesInfo &X,
2314                    const ObjCCategoriesInfo &Y) {
2315      return X.DefinitionID < Y.DefinitionID;
2316    }
2317    bool operator()(DeclID X, DeclID Y) {
2318      return X < Y;
2319    }
2320  };
2321
2322  /// \brief Given an ObjC interface, goes through the modules and links to the
2323  /// interface all the categories for it.
2324  class ObjCCategoriesVisitor {
2325    ASTReader &Reader;
2326    serialization::GlobalDeclID InterfaceID;
2327    ObjCInterfaceDecl *Interface;
2328    llvm::SmallPtrSet<ObjCCategoryDecl *, 16> &Deserialized;
2329    unsigned PreviousGeneration;
2330    ObjCCategoryDecl *Tail;
2331    llvm::DenseMap<DeclarationName, ObjCCategoryDecl *> NameCategoryMap;
2332
2333    void add(ObjCCategoryDecl *Cat) {
2334      // Only process each category once.
2335      if (!Deserialized.count(Cat))
2336        return;
2337      Deserialized.erase(Cat);
2338
2339      // Check for duplicate categories.
2340      if (Cat->getDeclName()) {
2341        ObjCCategoryDecl *&Existing = NameCategoryMap[Cat->getDeclName()];
2342        if (Existing &&
2343            Reader.getOwningModuleFile(Existing)
2344                                          != Reader.getOwningModuleFile(Cat)) {
2345          // FIXME: We should not warn for duplicates in diamond:
2346          //
2347          //   MT     //
2348          //  /  \    //
2349          // ML  MR   //
2350          //  \  /    //
2351          //   MB     //
2352          //
2353          // If there are duplicates in ML/MR, there will be warning when
2354          // creating MB *and* when importing MB. We should not warn when
2355          // importing.
2356          Reader.Diag(Cat->getLocation(), diag::warn_dup_category_def)
2357            << Interface->getDeclName() << Cat->getDeclName();
2358          Reader.Diag(Existing->getLocation(), diag::note_previous_definition);
2359        } else if (!Existing) {
2360          // Record this category.
2361          Existing = Cat;
2362        }
2363      }
2364
2365      // Add this category to the end of the chain.
2366      if (Tail)
2367        ASTDeclReader::setNextObjCCategory(Tail, Cat);
2368      else
2369        Interface->setCategoryList(Cat);
2370      Tail = Cat;
2371    }
2372
2373  public:
2374    ObjCCategoriesVisitor(ASTReader &Reader,
2375                          serialization::GlobalDeclID InterfaceID,
2376                          ObjCInterfaceDecl *Interface,
2377                        llvm::SmallPtrSet<ObjCCategoryDecl *, 16> &Deserialized,
2378                          unsigned PreviousGeneration)
2379      : Reader(Reader), InterfaceID(InterfaceID), Interface(Interface),
2380        Deserialized(Deserialized), PreviousGeneration(PreviousGeneration),
2381        Tail(0)
2382    {
2383      // Populate the name -> category map with the set of known categories.
2384      for (ObjCCategoryDecl *Cat = Interface->getCategoryList(); Cat;
2385           Cat = Cat->getNextClassCategory()) {
2386        if (Cat->getDeclName())
2387          NameCategoryMap[Cat->getDeclName()] = Cat;
2388
2389        // Keep track of the tail of the category list.
2390        Tail = Cat;
2391      }
2392    }
2393
2394    static bool visit(ModuleFile &M, void *UserData) {
2395      return static_cast<ObjCCategoriesVisitor *>(UserData)->visit(M);
2396    }
2397
2398    bool visit(ModuleFile &M) {
2399      // If we've loaded all of the category information we care about from
2400      // this module file, we're done.
2401      if (M.Generation <= PreviousGeneration)
2402        return true;
2403
2404      // Map global ID of the definition down to the local ID used in this
2405      // module file. If there is no such mapping, we'll find nothing here
2406      // (or in any module it imports).
2407      DeclID LocalID = Reader.mapGlobalIDToModuleFileGlobalID(M, InterfaceID);
2408      if (!LocalID)
2409        return true;
2410
2411      // Perform a binary search to find the local redeclarations for this
2412      // declaration (if any).
2413      const ObjCCategoriesInfo *Result
2414        = std::lower_bound(M.ObjCCategoriesMap,
2415                           M.ObjCCategoriesMap + M.LocalNumObjCCategoriesInMap,
2416                           LocalID, CompareObjCCategoriesInfo());
2417      if (Result == M.ObjCCategoriesMap + M.LocalNumObjCCategoriesInMap ||
2418          Result->DefinitionID != LocalID) {
2419        // We didn't find anything. If the class definition is in this module
2420        // file, then the module files it depends on cannot have any categories,
2421        // so suppress further lookup.
2422        return Reader.isDeclIDFromModule(InterfaceID, M);
2423      }
2424
2425      // We found something. Dig out all of the categories.
2426      unsigned Offset = Result->Offset;
2427      unsigned N = M.ObjCCategories[Offset];
2428      M.ObjCCategories[Offset++] = 0; // Don't try to deserialize again
2429      for (unsigned I = 0; I != N; ++I)
2430        add(cast_or_null<ObjCCategoryDecl>(
2431              Reader.GetLocalDecl(M, M.ObjCCategories[Offset++])));
2432      return true;
2433    }
2434  };
2435}
2436
2437void ASTReader::loadObjCCategories(serialization::GlobalDeclID ID,
2438                                   ObjCInterfaceDecl *D,
2439                                   unsigned PreviousGeneration) {
2440  ObjCCategoriesVisitor Visitor(*this, ID, D, CategoriesDeserialized,
2441                                PreviousGeneration);
2442  ModuleMgr.visit(ObjCCategoriesVisitor::visit, &Visitor);
2443}
2444
2445void ASTDeclReader::UpdateDecl(Decl *D, ModuleFile &ModuleFile,
2446                               const RecordData &Record) {
2447  unsigned Idx = 0;
2448  while (Idx < Record.size()) {
2449    switch ((DeclUpdateKind)Record[Idx++]) {
2450    case UPD_CXX_ADDED_IMPLICIT_MEMBER:
2451      cast<CXXRecordDecl>(D)->addedMember(Reader.ReadDecl(ModuleFile, Record, Idx));
2452      break;
2453
2454    case UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION:
2455      // It will be added to the template's specializations set when loaded.
2456      (void)Reader.ReadDecl(ModuleFile, Record, Idx);
2457      break;
2458
2459    case UPD_CXX_ADDED_ANONYMOUS_NAMESPACE: {
2460      NamespaceDecl *Anon
2461        = Reader.ReadDeclAs<NamespaceDecl>(ModuleFile, Record, Idx);
2462
2463      // Each module has its own anonymous namespace, which is disjoint from
2464      // any other module's anonymous namespaces, so don't attach the anonymous
2465      // namespace at all.
2466      if (ModuleFile.Kind != MK_Module) {
2467        if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(D))
2468          TU->setAnonymousNamespace(Anon);
2469        else
2470          cast<NamespaceDecl>(D)->setAnonymousNamespace(Anon);
2471      }
2472      break;
2473    }
2474
2475    case UPD_CXX_INSTANTIATED_STATIC_DATA_MEMBER:
2476      cast<VarDecl>(D)->getMemberSpecializationInfo()->setPointOfInstantiation(
2477          Reader.ReadSourceLocation(ModuleFile, Record, Idx));
2478      break;
2479    }
2480  }
2481}
2482