ASTReaderDecl.cpp revision 212904 
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 "clang/Serialization/ASTReader.h"
16#include "clang/AST/ASTConsumer.h"
17#include "clang/AST/ASTContext.h"
18#include "clang/AST/DeclVisitor.h"
19#include "clang/AST/DeclGroup.h"
20#include "clang/AST/DeclCXX.h"
21#include "clang/AST/DeclTemplate.h"
22#include "clang/AST/Expr.h"
23using namespace clang;
24using namespace clang::serialization;
25
26//===----------------------------------------------------------------------===//
27// Declaration deserialization
28//===----------------------------------------------------------------------===//
29
30namespace clang {
31  class ASTDeclReader : public DeclVisitor<ASTDeclReader, void> {
32    ASTReader &Reader;
33    llvm::BitstreamCursor &Cursor;
34    const DeclID ThisDeclID;
35    const ASTReader::RecordData &Record;
36    unsigned &Idx;
37    TypeID TypeIDForTypeDecl;
38
39    uint64_t GetCurrentCursorOffset();
40
41  public:
42    ASTDeclReader(ASTReader &Reader, llvm::BitstreamCursor &Cursor,
43                  DeclID thisDeclID, const ASTReader::RecordData &Record,
44                  unsigned &Idx)
45      : Reader(Reader), Cursor(Cursor), ThisDeclID(thisDeclID), Record(Record),
46        Idx(Idx), TypeIDForTypeDecl(0) { }
47
48    void Visit(Decl *D);
49
50    void VisitDecl(Decl *D);
51    void VisitTranslationUnitDecl(TranslationUnitDecl *TU);
52    void VisitNamedDecl(NamedDecl *ND);
53    void VisitNamespaceDecl(NamespaceDecl *D);
54    void VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
55    void VisitNamespaceAliasDecl(NamespaceAliasDecl *D);
56    void VisitTypeDecl(TypeDecl *TD);
57    void VisitTypedefDecl(TypedefDecl *TD);
58    void VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
59    void VisitTagDecl(TagDecl *TD);
60    void VisitEnumDecl(EnumDecl *ED);
61    void VisitRecordDecl(RecordDecl *RD);
62    void VisitCXXRecordDecl(CXXRecordDecl *D);
63    void VisitClassTemplateSpecializationDecl(
64                                            ClassTemplateSpecializationDecl *D);
65    void VisitClassTemplatePartialSpecializationDecl(
66                                     ClassTemplatePartialSpecializationDecl *D);
67    void VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D);
68    void VisitValueDecl(ValueDecl *VD);
69    void VisitEnumConstantDecl(EnumConstantDecl *ECD);
70    void VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
71    void VisitDeclaratorDecl(DeclaratorDecl *DD);
72    void VisitFunctionDecl(FunctionDecl *FD);
73    void VisitCXXMethodDecl(CXXMethodDecl *D);
74    void VisitCXXConstructorDecl(CXXConstructorDecl *D);
75    void VisitCXXDestructorDecl(CXXDestructorDecl *D);
76    void VisitCXXConversionDecl(CXXConversionDecl *D);
77    void VisitFieldDecl(FieldDecl *FD);
78    void VisitVarDecl(VarDecl *VD);
79    void VisitImplicitParamDecl(ImplicitParamDecl *PD);
80    void VisitParmVarDecl(ParmVarDecl *PD);
81    void VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D);
82    void VisitTemplateDecl(TemplateDecl *D);
83    void VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D);
84    void VisitClassTemplateDecl(ClassTemplateDecl *D);
85    void VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
86    void VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D);
87    void VisitUsingDecl(UsingDecl *D);
88    void VisitUsingShadowDecl(UsingShadowDecl *D);
89    void VisitLinkageSpecDecl(LinkageSpecDecl *D);
90    void VisitFileScopeAsmDecl(FileScopeAsmDecl *AD);
91    void VisitAccessSpecDecl(AccessSpecDecl *D);
92    void VisitFriendDecl(FriendDecl *D);
93    void VisitFriendTemplateDecl(FriendTemplateDecl *D);
94    void VisitStaticAssertDecl(StaticAssertDecl *D);
95    void VisitBlockDecl(BlockDecl *BD);
96
97    std::pair<uint64_t, uint64_t> VisitDeclContext(DeclContext *DC);
98    template <typename T> void VisitRedeclarable(Redeclarable<T> *D);
99
100    // FIXME: Reorder according to DeclNodes.td?
101    void VisitObjCMethodDecl(ObjCMethodDecl *D);
102    void VisitObjCContainerDecl(ObjCContainerDecl *D);
103    void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
104    void VisitObjCIvarDecl(ObjCIvarDecl *D);
105    void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
106    void VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D);
107    void VisitObjCClassDecl(ObjCClassDecl *D);
108    void VisitObjCForwardProtocolDecl(ObjCForwardProtocolDecl *D);
109    void VisitObjCCategoryDecl(ObjCCategoryDecl *D);
110    void VisitObjCImplDecl(ObjCImplDecl *D);
111    void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
112    void VisitObjCImplementationDecl(ObjCImplementationDecl *D);
113    void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D);
114    void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
115    void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
116  };
117}
118
119uint64_t ASTDeclReader::GetCurrentCursorOffset() {
120  uint64_t Off = 0;
121  for (unsigned I = 0, N = Reader.Chain.size(); I != N; ++I) {
122    ASTReader::PerFileData &F = *Reader.Chain[N - I - 1];
123    if (&Cursor == &F.DeclsCursor) {
124      Off += F.DeclsCursor.GetCurrentBitNo();
125      break;
126    }
127    Off += F.SizeInBits;
128  }
129  return Off;
130}
131
132void ASTDeclReader::Visit(Decl *D) {
133  DeclVisitor<ASTDeclReader, void>::Visit(D);
134
135  if (TypeDecl *TD = dyn_cast<TypeDecl>(D)) {
136    // if we have a fully initialized TypeDecl, we can safely read its type now.
137    TD->setTypeForDecl(Reader.GetType(TypeIDForTypeDecl).getTypePtr());
138  } else if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
139    // FunctionDecl's body was written last after all other Stmts/Exprs.
140    if (Record[Idx++])
141      FD->setLazyBody(GetCurrentCursorOffset());
142  }
143}
144
145void ASTDeclReader::VisitDecl(Decl *D) {
146  D->setDeclContext(cast_or_null<DeclContext>(Reader.GetDecl(Record[Idx++])));
147  D->setLexicalDeclContext(
148                     cast_or_null<DeclContext>(Reader.GetDecl(Record[Idx++])));
149  D->setLocation(SourceLocation::getFromRawEncoding(Record[Idx++]));
150  D->setInvalidDecl(Record[Idx++]);
151  if (Record[Idx++]) {
152    AttrVec Attrs;
153    Reader.ReadAttributes(Cursor, Attrs);
154    D->setAttrs(Attrs);
155  }
156  D->setImplicit(Record[Idx++]);
157  D->setUsed(Record[Idx++]);
158  D->setAccess((AccessSpecifier)Record[Idx++]);
159  D->setPCHLevel(Record[Idx++] + 1);
160}
161
162void ASTDeclReader::VisitTranslationUnitDecl(TranslationUnitDecl *TU) {
163  VisitDecl(TU);
164  TU->setAnonymousNamespace(
165                    cast_or_null<NamespaceDecl>(Reader.GetDecl(Record[Idx++])));
166}
167
168void ASTDeclReader::VisitNamedDecl(NamedDecl *ND) {
169  VisitDecl(ND);
170  ND->setDeclName(Reader.ReadDeclarationName(Record, Idx));
171}
172
173void ASTDeclReader::VisitTypeDecl(TypeDecl *TD) {
174  VisitNamedDecl(TD);
175  // Delay type reading until after we have fully initialized the decl.
176  TypeIDForTypeDecl = Record[Idx++];
177}
178
179void ASTDeclReader::VisitTypedefDecl(TypedefDecl *TD) {
180  VisitTypeDecl(TD);
181  TD->setTypeSourceInfo(Reader.GetTypeSourceInfo(Cursor, Record, Idx));
182}
183
184void ASTDeclReader::VisitTagDecl(TagDecl *TD) {
185  VisitTypeDecl(TD);
186  TD->IdentifierNamespace = Record[Idx++];
187  VisitRedeclarable(TD);
188  TD->setTagKind((TagDecl::TagKind)Record[Idx++]);
189  TD->setDefinition(Record[Idx++]);
190  TD->setEmbeddedInDeclarator(Record[Idx++]);
191  TD->setRBraceLoc(SourceLocation::getFromRawEncoding(Record[Idx++]));
192  TD->setTagKeywordLoc(SourceLocation::getFromRawEncoding(Record[Idx++]));
193  // FIXME: maybe read optional qualifier and its range.
194  TD->setTypedefForAnonDecl(
195                    cast_or_null<TypedefDecl>(Reader.GetDecl(Record[Idx++])));
196}
197
198void ASTDeclReader::VisitEnumDecl(EnumDecl *ED) {
199  VisitTagDecl(ED);
200  ED->setIntegerType(Reader.GetType(Record[Idx++]));
201  ED->setPromotionType(Reader.GetType(Record[Idx++]));
202  ED->setNumPositiveBits(Record[Idx++]);
203  ED->setNumNegativeBits(Record[Idx++]);
204  ED->setInstantiationOfMemberEnum(
205                         cast_or_null<EnumDecl>(Reader.GetDecl(Record[Idx++])));
206}
207
208void ASTDeclReader::VisitRecordDecl(RecordDecl *RD) {
209  VisitTagDecl(RD);
210  RD->setHasFlexibleArrayMember(Record[Idx++]);
211  RD->setAnonymousStructOrUnion(Record[Idx++]);
212  RD->setHasObjectMember(Record[Idx++]);
213}
214
215void ASTDeclReader::VisitValueDecl(ValueDecl *VD) {
216  VisitNamedDecl(VD);
217  VD->setType(Reader.GetType(Record[Idx++]));
218}
219
220void ASTDeclReader::VisitEnumConstantDecl(EnumConstantDecl *ECD) {
221  VisitValueDecl(ECD);
222  if (Record[Idx++])
223    ECD->setInitExpr(Reader.ReadExpr(Cursor));
224  ECD->setInitVal(Reader.ReadAPSInt(Record, Idx));
225}
226
227void ASTDeclReader::VisitDeclaratorDecl(DeclaratorDecl *DD) {
228  VisitValueDecl(DD);
229  TypeSourceInfo *TInfo = Reader.GetTypeSourceInfo(Cursor, Record, Idx);
230  if (TInfo)
231    DD->setTypeSourceInfo(TInfo);
232  // FIXME: read optional qualifier and its range.
233}
234
235void ASTDeclReader::VisitFunctionDecl(FunctionDecl *FD) {
236  VisitDeclaratorDecl(FD);
237  // FIXME: read DeclarationNameLoc.
238
239  FD->IdentifierNamespace = Record[Idx++];
240  switch ((FunctionDecl::TemplatedKind)Record[Idx++]) {
241  default: assert(false && "Unhandled TemplatedKind!");
242    break;
243  case FunctionDecl::TK_NonTemplate:
244    break;
245  case FunctionDecl::TK_FunctionTemplate:
246    FD->setDescribedFunctionTemplate(
247                     cast<FunctionTemplateDecl>(Reader.GetDecl(Record[Idx++])));
248    break;
249  case FunctionDecl::TK_MemberSpecialization: {
250    FunctionDecl *InstFD = cast<FunctionDecl>(Reader.GetDecl(Record[Idx++]));
251    TemplateSpecializationKind TSK = (TemplateSpecializationKind)Record[Idx++];
252    SourceLocation POI = Reader.ReadSourceLocation(Record, Idx);
253    FD->setInstantiationOfMemberFunction(InstFD, TSK);
254    FD->getMemberSpecializationInfo()->setPointOfInstantiation(POI);
255    break;
256  }
257  case FunctionDecl::TK_FunctionTemplateSpecialization: {
258    FunctionTemplateDecl *Template
259      = cast<FunctionTemplateDecl>(Reader.GetDecl(Record[Idx++]));
260    TemplateSpecializationKind TSK = (TemplateSpecializationKind)Record[Idx++];
261
262    // Template arguments.
263    llvm::SmallVector<TemplateArgument, 8> TemplArgs;
264    Reader.ReadTemplateArgumentList(TemplArgs, Cursor, Record, Idx);
265
266    // Template args as written.
267    llvm::SmallVector<TemplateArgumentLoc, 8> TemplArgLocs;
268    SourceLocation LAngleLoc, RAngleLoc;
269    if (Record[Idx++]) {  // TemplateArgumentsAsWritten != 0
270      unsigned NumTemplateArgLocs = Record[Idx++];
271      TemplArgLocs.reserve(NumTemplateArgLocs);
272      for (unsigned i=0; i != NumTemplateArgLocs; ++i)
273        TemplArgLocs.push_back(
274            Reader.ReadTemplateArgumentLoc(Cursor, Record, Idx));
275
276      LAngleLoc = Reader.ReadSourceLocation(Record, Idx);
277      RAngleLoc = Reader.ReadSourceLocation(Record, Idx);
278    }
279
280    SourceLocation POI = Reader.ReadSourceLocation(Record, Idx);
281
282    if (FD->isCanonicalDecl()) // if canonical add to template's set.
283      FD->setFunctionTemplateSpecialization(Template, TemplArgs.size(),
284                                            TemplArgs.data(), TSK,
285                                            TemplArgLocs.size(),
286                                            TemplArgLocs.data(),
287                                            LAngleLoc, RAngleLoc, POI);
288    break;
289  }
290  case FunctionDecl::TK_DependentFunctionTemplateSpecialization: {
291    // Templates.
292    UnresolvedSet<8> TemplDecls;
293    unsigned NumTemplates = Record[Idx++];
294    while (NumTemplates--)
295      TemplDecls.addDecl(cast<NamedDecl>(Reader.GetDecl(Record[Idx++])));
296
297    // Templates args.
298    TemplateArgumentListInfo TemplArgs;
299    unsigned NumArgs = Record[Idx++];
300    while (NumArgs--)
301      TemplArgs.addArgument(Reader.ReadTemplateArgumentLoc(Cursor,Record, Idx));
302    TemplArgs.setLAngleLoc(Reader.ReadSourceLocation(Record, Idx));
303    TemplArgs.setRAngleLoc(Reader.ReadSourceLocation(Record, Idx));
304
305    FD->setDependentTemplateSpecialization(*Reader.getContext(),
306                                           TemplDecls, TemplArgs);
307    break;
308  }
309  }
310
311  // FunctionDecl's body is handled last at ASTDeclReader::Visit,
312  // after everything else is read.
313
314  VisitRedeclarable(FD);
315  FD->setStorageClass((StorageClass)Record[Idx++]);
316  FD->setStorageClassAsWritten((StorageClass)Record[Idx++]);
317  FD->setInlineSpecified(Record[Idx++]);
318  FD->setVirtualAsWritten(Record[Idx++]);
319  FD->setPure(Record[Idx++]);
320  FD->setHasInheritedPrototype(Record[Idx++]);
321  FD->setHasWrittenPrototype(Record[Idx++]);
322  FD->setDeleted(Record[Idx++]);
323  FD->setTrivial(Record[Idx++]);
324  FD->setCopyAssignment(Record[Idx++]);
325  FD->setHasImplicitReturnZero(Record[Idx++]);
326  FD->setLocEnd(SourceLocation::getFromRawEncoding(Record[Idx++]));
327
328  // Read in the parameters.
329  unsigned NumParams = Record[Idx++];
330  llvm::SmallVector<ParmVarDecl *, 16> Params;
331  Params.reserve(NumParams);
332  for (unsigned I = 0; I != NumParams; ++I)
333    Params.push_back(cast<ParmVarDecl>(Reader.GetDecl(Record[Idx++])));
334  FD->setParams(Params.data(), NumParams);
335}
336
337void ASTDeclReader::VisitObjCMethodDecl(ObjCMethodDecl *MD) {
338  VisitNamedDecl(MD);
339  if (Record[Idx++]) {
340    // In practice, this won't be executed (since method definitions
341    // don't occur in header files).
342    MD->setBody(Reader.ReadStmt(Cursor));
343    MD->setSelfDecl(cast<ImplicitParamDecl>(Reader.GetDecl(Record[Idx++])));
344    MD->setCmdDecl(cast<ImplicitParamDecl>(Reader.GetDecl(Record[Idx++])));
345  }
346  MD->setInstanceMethod(Record[Idx++]);
347  MD->setVariadic(Record[Idx++]);
348  MD->setSynthesized(Record[Idx++]);
349  MD->setDefined(Record[Idx++]);
350  MD->setDeclImplementation((ObjCMethodDecl::ImplementationControl)Record[Idx++]);
351  MD->setObjCDeclQualifier((Decl::ObjCDeclQualifier)Record[Idx++]);
352  MD->setNumSelectorArgs(unsigned(Record[Idx++]));
353  MD->setResultType(Reader.GetType(Record[Idx++]));
354  MD->setResultTypeSourceInfo(Reader.GetTypeSourceInfo(Cursor, Record, Idx));
355  MD->setEndLoc(SourceLocation::getFromRawEncoding(Record[Idx++]));
356  unsigned NumParams = Record[Idx++];
357  llvm::SmallVector<ParmVarDecl *, 16> Params;
358  Params.reserve(NumParams);
359  for (unsigned I = 0; I != NumParams; ++I)
360    Params.push_back(cast<ParmVarDecl>(Reader.GetDecl(Record[Idx++])));
361  MD->setMethodParams(*Reader.getContext(), Params.data(), NumParams,
362                      NumParams);
363}
364
365void ASTDeclReader::VisitObjCContainerDecl(ObjCContainerDecl *CD) {
366  VisitNamedDecl(CD);
367  SourceLocation A = SourceLocation::getFromRawEncoding(Record[Idx++]);
368  SourceLocation B = SourceLocation::getFromRawEncoding(Record[Idx++]);
369  CD->setAtEndRange(SourceRange(A, B));
370}
371
372void ASTDeclReader::VisitObjCInterfaceDecl(ObjCInterfaceDecl *ID) {
373  VisitObjCContainerDecl(ID);
374  ID->setTypeForDecl(Reader.GetType(Record[Idx++]).getTypePtr());
375  ID->setSuperClass(cast_or_null<ObjCInterfaceDecl>
376                       (Reader.GetDecl(Record[Idx++])));
377
378  // Read the directly referenced protocols and their SourceLocations.
379  unsigned NumProtocols = Record[Idx++];
380  llvm::SmallVector<ObjCProtocolDecl *, 16> Protocols;
381  Protocols.reserve(NumProtocols);
382  for (unsigned I = 0; I != NumProtocols; ++I)
383    Protocols.push_back(cast<ObjCProtocolDecl>(Reader.GetDecl(Record[Idx++])));
384  llvm::SmallVector<SourceLocation, 16> ProtoLocs;
385  ProtoLocs.reserve(NumProtocols);
386  for (unsigned I = 0; I != NumProtocols; ++I)
387    ProtoLocs.push_back(SourceLocation::getFromRawEncoding(Record[Idx++]));
388  ID->setProtocolList(Protocols.data(), NumProtocols, ProtoLocs.data(),
389                      *Reader.getContext());
390
391  // Read the transitive closure of protocols referenced by this class.
392  NumProtocols = Record[Idx++];
393  Protocols.clear();
394  Protocols.reserve(NumProtocols);
395  for (unsigned I = 0; I != NumProtocols; ++I)
396    Protocols.push_back(cast<ObjCProtocolDecl>(Reader.GetDecl(Record[Idx++])));
397  ID->AllReferencedProtocols.set(Protocols.data(), NumProtocols,
398                                 *Reader.getContext());
399
400  // Read the ivars.
401  unsigned NumIvars = Record[Idx++];
402  llvm::SmallVector<ObjCIvarDecl *, 16> IVars;
403  IVars.reserve(NumIvars);
404  for (unsigned I = 0; I != NumIvars; ++I)
405    IVars.push_back(cast<ObjCIvarDecl>(Reader.GetDecl(Record[Idx++])));
406  ID->setCategoryList(
407               cast_or_null<ObjCCategoryDecl>(Reader.GetDecl(Record[Idx++])));
408  // We will rebuild this list lazily.
409  ID->setIvarList(0);
410  ID->setForwardDecl(Record[Idx++]);
411  ID->setImplicitInterfaceDecl(Record[Idx++]);
412  ID->setClassLoc(SourceLocation::getFromRawEncoding(Record[Idx++]));
413  ID->setSuperClassLoc(SourceLocation::getFromRawEncoding(Record[Idx++]));
414  ID->setLocEnd(SourceLocation::getFromRawEncoding(Record[Idx++]));
415}
416
417void ASTDeclReader::VisitObjCIvarDecl(ObjCIvarDecl *IVD) {
418  VisitFieldDecl(IVD);
419  IVD->setAccessControl((ObjCIvarDecl::AccessControl)Record[Idx++]);
420  // This field will be built lazily.
421  IVD->setNextIvar(0);
422  bool synth = Record[Idx++];
423  IVD->setSynthesize(synth);
424}
425
426void ASTDeclReader::VisitObjCProtocolDecl(ObjCProtocolDecl *PD) {
427  VisitObjCContainerDecl(PD);
428  PD->setForwardDecl(Record[Idx++]);
429  PD->setLocEnd(SourceLocation::getFromRawEncoding(Record[Idx++]));
430  unsigned NumProtoRefs = Record[Idx++];
431  llvm::SmallVector<ObjCProtocolDecl *, 16> ProtoRefs;
432  ProtoRefs.reserve(NumProtoRefs);
433  for (unsigned I = 0; I != NumProtoRefs; ++I)
434    ProtoRefs.push_back(cast<ObjCProtocolDecl>(Reader.GetDecl(Record[Idx++])));
435  llvm::SmallVector<SourceLocation, 16> ProtoLocs;
436  ProtoLocs.reserve(NumProtoRefs);
437  for (unsigned I = 0; I != NumProtoRefs; ++I)
438    ProtoLocs.push_back(SourceLocation::getFromRawEncoding(Record[Idx++]));
439  PD->setProtocolList(ProtoRefs.data(), NumProtoRefs, ProtoLocs.data(),
440                      *Reader.getContext());
441}
442
443void ASTDeclReader::VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *FD) {
444  VisitFieldDecl(FD);
445}
446
447void ASTDeclReader::VisitObjCClassDecl(ObjCClassDecl *CD) {
448  VisitDecl(CD);
449  unsigned NumClassRefs = Record[Idx++];
450  llvm::SmallVector<ObjCInterfaceDecl *, 16> ClassRefs;
451  ClassRefs.reserve(NumClassRefs);
452  for (unsigned I = 0; I != NumClassRefs; ++I)
453    ClassRefs.push_back(cast<ObjCInterfaceDecl>(Reader.GetDecl(Record[Idx++])));
454  llvm::SmallVector<SourceLocation, 16> SLocs;
455  SLocs.reserve(NumClassRefs);
456  for (unsigned I = 0; I != NumClassRefs; ++I)
457    SLocs.push_back(SourceLocation::getFromRawEncoding(Record[Idx++]));
458  CD->setClassList(*Reader.getContext(), ClassRefs.data(), SLocs.data(),
459                   NumClassRefs);
460}
461
462void ASTDeclReader::VisitObjCForwardProtocolDecl(ObjCForwardProtocolDecl *FPD) {
463  VisitDecl(FPD);
464  unsigned NumProtoRefs = Record[Idx++];
465  llvm::SmallVector<ObjCProtocolDecl *, 16> ProtoRefs;
466  ProtoRefs.reserve(NumProtoRefs);
467  for (unsigned I = 0; I != NumProtoRefs; ++I)
468    ProtoRefs.push_back(cast<ObjCProtocolDecl>(Reader.GetDecl(Record[Idx++])));
469  llvm::SmallVector<SourceLocation, 16> ProtoLocs;
470  ProtoLocs.reserve(NumProtoRefs);
471  for (unsigned I = 0; I != NumProtoRefs; ++I)
472    ProtoLocs.push_back(SourceLocation::getFromRawEncoding(Record[Idx++]));
473  FPD->setProtocolList(ProtoRefs.data(), NumProtoRefs, ProtoLocs.data(),
474                       *Reader.getContext());
475}
476
477void ASTDeclReader::VisitObjCCategoryDecl(ObjCCategoryDecl *CD) {
478  VisitObjCContainerDecl(CD);
479  CD->setClassInterface(cast<ObjCInterfaceDecl>(Reader.GetDecl(Record[Idx++])));
480  unsigned NumProtoRefs = Record[Idx++];
481  llvm::SmallVector<ObjCProtocolDecl *, 16> ProtoRefs;
482  ProtoRefs.reserve(NumProtoRefs);
483  for (unsigned I = 0; I != NumProtoRefs; ++I)
484    ProtoRefs.push_back(cast<ObjCProtocolDecl>(Reader.GetDecl(Record[Idx++])));
485  llvm::SmallVector<SourceLocation, 16> ProtoLocs;
486  ProtoLocs.reserve(NumProtoRefs);
487  for (unsigned I = 0; I != NumProtoRefs; ++I)
488    ProtoLocs.push_back(SourceLocation::getFromRawEncoding(Record[Idx++]));
489  CD->setProtocolList(ProtoRefs.data(), NumProtoRefs, ProtoLocs.data(),
490                      *Reader.getContext());
491  CD->setNextClassCategory(cast_or_null<ObjCCategoryDecl>(Reader.GetDecl(Record[Idx++])));
492  CD->setHasSynthBitfield(Record[Idx++]);
493  CD->setAtLoc(SourceLocation::getFromRawEncoding(Record[Idx++]));
494  CD->setCategoryNameLoc(SourceLocation::getFromRawEncoding(Record[Idx++]));
495}
496
497void ASTDeclReader::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *CAD) {
498  VisitNamedDecl(CAD);
499  CAD->setClassInterface(cast<ObjCInterfaceDecl>(Reader.GetDecl(Record[Idx++])));
500}
501
502void ASTDeclReader::VisitObjCPropertyDecl(ObjCPropertyDecl *D) {
503  VisitNamedDecl(D);
504  D->setAtLoc(SourceLocation::getFromRawEncoding(Record[Idx++]));
505  D->setType(Reader.GetTypeSourceInfo(Cursor, Record, Idx));
506  // FIXME: stable encoding
507  D->setPropertyAttributes(
508                      (ObjCPropertyDecl::PropertyAttributeKind)Record[Idx++]);
509  D->setPropertyAttributesAsWritten(
510                      (ObjCPropertyDecl::PropertyAttributeKind)Record[Idx++]);
511  // FIXME: stable encoding
512  D->setPropertyImplementation(
513                            (ObjCPropertyDecl::PropertyControl)Record[Idx++]);
514  D->setGetterName(Reader.ReadDeclarationName(Record, Idx).getObjCSelector());
515  D->setSetterName(Reader.ReadDeclarationName(Record, Idx).getObjCSelector());
516  D->setGetterMethodDecl(
517                 cast_or_null<ObjCMethodDecl>(Reader.GetDecl(Record[Idx++])));
518  D->setSetterMethodDecl(
519                 cast_or_null<ObjCMethodDecl>(Reader.GetDecl(Record[Idx++])));
520  D->setPropertyIvarDecl(
521                   cast_or_null<ObjCIvarDecl>(Reader.GetDecl(Record[Idx++])));
522}
523
524void ASTDeclReader::VisitObjCImplDecl(ObjCImplDecl *D) {
525  VisitObjCContainerDecl(D);
526  D->setClassInterface(
527              cast_or_null<ObjCInterfaceDecl>(Reader.GetDecl(Record[Idx++])));
528}
529
530void ASTDeclReader::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D) {
531  VisitObjCImplDecl(D);
532  D->setIdentifier(Reader.GetIdentifierInfo(Record, Idx));
533}
534
535void ASTDeclReader::VisitObjCImplementationDecl(ObjCImplementationDecl *D) {
536  VisitObjCImplDecl(D);
537  D->setSuperClass(
538              cast_or_null<ObjCInterfaceDecl>(Reader.GetDecl(Record[Idx++])));
539  llvm::tie(D->IvarInitializers, D->NumIvarInitializers)
540      = Reader.ReadCXXBaseOrMemberInitializers(Cursor, Record, Idx);
541  D->setHasSynthBitfield(Record[Idx++]);
542}
543
544
545void ASTDeclReader::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D) {
546  VisitDecl(D);
547  D->setAtLoc(SourceLocation::getFromRawEncoding(Record[Idx++]));
548  D->setPropertyDecl(
549               cast_or_null<ObjCPropertyDecl>(Reader.GetDecl(Record[Idx++])));
550  D->setPropertyIvarDecl(
551                   cast_or_null<ObjCIvarDecl>(Reader.GetDecl(Record[Idx++])));
552  D->setGetterCXXConstructor(Reader.ReadExpr(Cursor));
553  D->setSetterCXXAssignment(Reader.ReadExpr(Cursor));
554}
555
556void ASTDeclReader::VisitFieldDecl(FieldDecl *FD) {
557  VisitDeclaratorDecl(FD);
558  FD->setMutable(Record[Idx++]);
559  if (Record[Idx++])
560    FD->setBitWidth(Reader.ReadExpr(Cursor));
561  if (!FD->getDeclName()) {
562    FieldDecl *Tmpl = cast_or_null<FieldDecl>(Reader.GetDecl(Record[Idx++]));
563    if (Tmpl)
564      Reader.getContext()->setInstantiatedFromUnnamedFieldDecl(FD, Tmpl);
565  }
566}
567
568void ASTDeclReader::VisitVarDecl(VarDecl *VD) {
569  VisitDeclaratorDecl(VD);
570  VD->setStorageClass((StorageClass)Record[Idx++]);
571  VD->setStorageClassAsWritten((StorageClass)Record[Idx++]);
572  VD->setThreadSpecified(Record[Idx++]);
573  VD->setCXXDirectInitializer(Record[Idx++]);
574  VD->setExceptionVariable(Record[Idx++]);
575  VD->setNRVOVariable(Record[Idx++]);
576  VisitRedeclarable(VD);
577  if (Record[Idx++])
578    VD->setInit(Reader.ReadExpr(Cursor));
579
580  if (Record[Idx++]) { // HasMemberSpecializationInfo.
581    VarDecl *Tmpl = cast<VarDecl>(Reader.GetDecl(Record[Idx++]));
582    TemplateSpecializationKind TSK = (TemplateSpecializationKind)Record[Idx++];
583    SourceLocation POI = Reader.ReadSourceLocation(Record, Idx);
584    Reader.getContext()->setInstantiatedFromStaticDataMember(VD, Tmpl, TSK,POI);
585  }
586}
587
588void ASTDeclReader::VisitImplicitParamDecl(ImplicitParamDecl *PD) {
589  VisitVarDecl(PD);
590}
591
592void ASTDeclReader::VisitParmVarDecl(ParmVarDecl *PD) {
593  VisitVarDecl(PD);
594  PD->setObjCDeclQualifier((Decl::ObjCDeclQualifier)Record[Idx++]);
595  PD->setHasInheritedDefaultArg(Record[Idx++]);
596  if (Record[Idx++]) // hasUninstantiatedDefaultArg.
597    PD->setUninstantiatedDefaultArg(Reader.ReadExpr(Cursor));
598}
599
600void ASTDeclReader::VisitFileScopeAsmDecl(FileScopeAsmDecl *AD) {
601  VisitDecl(AD);
602  AD->setAsmString(cast<StringLiteral>(Reader.ReadExpr(Cursor)));
603}
604
605void ASTDeclReader::VisitBlockDecl(BlockDecl *BD) {
606  VisitDecl(BD);
607  BD->setBody(cast_or_null<CompoundStmt>(Reader.ReadStmt(Cursor)));
608  BD->setSignatureAsWritten(Reader.GetTypeSourceInfo(Cursor, Record, Idx));
609  unsigned NumParams = Record[Idx++];
610  llvm::SmallVector<ParmVarDecl *, 16> Params;
611  Params.reserve(NumParams);
612  for (unsigned I = 0; I != NumParams; ++I)
613    Params.push_back(cast<ParmVarDecl>(Reader.GetDecl(Record[Idx++])));
614  BD->setParams(Params.data(), NumParams);
615}
616
617void ASTDeclReader::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
618  VisitDecl(D);
619  D->setLanguage((LinkageSpecDecl::LanguageIDs)Record[Idx++]);
620  D->setHasBraces(Record[Idx++]);
621}
622
623void ASTDeclReader::VisitNamespaceDecl(NamespaceDecl *D) {
624  VisitNamedDecl(D);
625  D->setLBracLoc(Reader.ReadSourceLocation(Record, Idx));
626  D->setRBracLoc(Reader.ReadSourceLocation(Record, Idx));
627  D->setNextNamespace(
628                    cast_or_null<NamespaceDecl>(Reader.GetDecl(Record[Idx++])));
629
630  bool IsOriginal = Record[Idx++];
631  D->OrigOrAnonNamespace.setInt(IsOriginal);
632  D->OrigOrAnonNamespace.setPointer(
633                    cast_or_null<NamespaceDecl>(Reader.GetDecl(Record[Idx++])));
634}
635
636void ASTDeclReader::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
637  VisitNamedDecl(D);
638  D->NamespaceLoc = Reader.ReadSourceLocation(Record, Idx);
639  D->setQualifierRange(Reader.ReadSourceRange(Record, Idx));
640  D->setQualifier(Reader.ReadNestedNameSpecifier(Record, Idx));
641  D->IdentLoc = Reader.ReadSourceLocation(Record, Idx);
642  D->Namespace = cast<NamedDecl>(Reader.GetDecl(Record[Idx++]));
643}
644
645void ASTDeclReader::VisitUsingDecl(UsingDecl *D) {
646  VisitNamedDecl(D);
647  D->setUsingLocation(Reader.ReadSourceLocation(Record, Idx));
648  D->setNestedNameRange(Reader.ReadSourceRange(Record, Idx));
649  D->setTargetNestedNameDecl(Reader.ReadNestedNameSpecifier(Record, Idx));
650  // FIXME: read the DNLoc component.
651
652  // FIXME: It would probably be more efficient to read these into a vector
653  // and then re-cosntruct the shadow decl set over that vector since it
654  // would avoid existence checks.
655  unsigned NumShadows = Record[Idx++];
656  for(unsigned I = 0; I != NumShadows; ++I) {
657    // Avoid invariant checking of UsingDecl::addShadowDecl, the decl may still
658    // be initializing.
659    D->Shadows.insert(cast<UsingShadowDecl>(Reader.GetDecl(Record[Idx++])));
660  }
661  D->setTypeName(Record[Idx++]);
662  NamedDecl *Pattern = cast_or_null<NamedDecl>(Reader.GetDecl(Record[Idx++]));
663  if (Pattern)
664    Reader.getContext()->setInstantiatedFromUsingDecl(D, Pattern);
665}
666
667void ASTDeclReader::VisitUsingShadowDecl(UsingShadowDecl *D) {
668  VisitNamedDecl(D);
669  D->setTargetDecl(cast<NamedDecl>(Reader.GetDecl(Record[Idx++])));
670  D->setUsingDecl(cast<UsingDecl>(Reader.GetDecl(Record[Idx++])));
671  UsingShadowDecl *Pattern
672      = cast_or_null<UsingShadowDecl>(Reader.GetDecl(Record[Idx++]));
673  if (Pattern)
674    Reader.getContext()->setInstantiatedFromUsingShadowDecl(D, Pattern);
675}
676
677void ASTDeclReader::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
678  VisitNamedDecl(D);
679  D->UsingLoc = Reader.ReadSourceLocation(Record, Idx);
680  D->NamespaceLoc = Reader.ReadSourceLocation(Record, Idx);
681  D->QualifierRange = Reader.ReadSourceRange(Record, Idx);
682  D->Qualifier = Reader.ReadNestedNameSpecifier(Record, Idx);
683  D->NominatedNamespace = cast<NamedDecl>(Reader.GetDecl(Record[Idx++]));
684  D->CommonAncestor = cast_or_null<DeclContext>(Reader.GetDecl(Record[Idx++]));
685}
686
687void ASTDeclReader::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
688  VisitValueDecl(D);
689  D->setTargetNestedNameRange(Reader.ReadSourceRange(Record, Idx));
690  D->setUsingLoc(Reader.ReadSourceLocation(Record, Idx));
691  D->setTargetNestedNameSpecifier(Reader.ReadNestedNameSpecifier(Record, Idx));
692  // FIXME: read the DNLoc component.
693}
694
695void ASTDeclReader::VisitUnresolvedUsingTypenameDecl(
696                                               UnresolvedUsingTypenameDecl *D) {
697  VisitTypeDecl(D);
698  D->TargetNestedNameRange = Reader.ReadSourceRange(Record, Idx);
699  D->UsingLocation = Reader.ReadSourceLocation(Record, Idx);
700  D->TypenameLocation = Reader.ReadSourceLocation(Record, Idx);
701  D->TargetNestedNameSpecifier = Reader.ReadNestedNameSpecifier(Record, Idx);
702}
703
704void ASTDeclReader::VisitCXXRecordDecl(CXXRecordDecl *D) {
705  ASTContext &C = *Reader.getContext();
706
707  // We need to allocate the DefinitionData struct ahead of VisitRecordDecl
708  // so that the other CXXRecordDecls can get a pointer even when the owner
709  // is still initializing.
710  bool OwnsDefinitionData = false;
711  enum DataOwnership { Data_NoDefData, Data_Owner, Data_NotOwner };
712  switch ((DataOwnership)Record[Idx++]) {
713  default:
714    assert(0 && "Out of sync with ASTDeclWriter or messed up reading");
715  case Data_NoDefData:
716    break;
717  case Data_Owner:
718    OwnsDefinitionData = true;
719    D->DefinitionData = new (C) struct CXXRecordDecl::DefinitionData(D);
720    break;
721  case Data_NotOwner:
722    D->DefinitionData
723        = cast<CXXRecordDecl>(Reader.GetDecl(Record[Idx++]))->DefinitionData;
724    break;
725  }
726
727  VisitRecordDecl(D);
728
729  if (OwnsDefinitionData) {
730    assert(D->DefinitionData);
731    struct CXXRecordDecl::DefinitionData &Data = *D->DefinitionData;
732
733    Data.UserDeclaredConstructor = Record[Idx++];
734    Data.UserDeclaredCopyConstructor = Record[Idx++];
735    Data.UserDeclaredCopyAssignment = Record[Idx++];
736    Data.UserDeclaredDestructor = Record[Idx++];
737    Data.Aggregate = Record[Idx++];
738    Data.PlainOldData = Record[Idx++];
739    Data.Empty = Record[Idx++];
740    Data.Polymorphic = Record[Idx++];
741    Data.Abstract = Record[Idx++];
742    Data.HasTrivialConstructor = Record[Idx++];
743    Data.HasTrivialCopyConstructor = Record[Idx++];
744    Data.HasTrivialCopyAssignment = Record[Idx++];
745    Data.HasTrivialDestructor = Record[Idx++];
746    Data.ComputedVisibleConversions = Record[Idx++];
747    Data.DeclaredDefaultConstructor = Record[Idx++];
748    Data.DeclaredCopyConstructor = Record[Idx++];
749    Data.DeclaredCopyAssignment = Record[Idx++];
750    Data.DeclaredDestructor = Record[Idx++];
751
752    // setBases() is unsuitable since it may try to iterate the bases of an
753    // uninitialized base.
754    Data.NumBases = Record[Idx++];
755    Data.Bases = new(C) CXXBaseSpecifier [Data.NumBases];
756    for (unsigned i = 0; i != Data.NumBases; ++i)
757      Data.Bases[i] = Reader.ReadCXXBaseSpecifier(Cursor, Record, Idx);
758
759    // FIXME: Make VBases lazily computed when needed to avoid storing them.
760    Data.NumVBases = Record[Idx++];
761    Data.VBases = new(C) CXXBaseSpecifier [Data.NumVBases];
762    for (unsigned i = 0; i != Data.NumVBases; ++i)
763      Data.VBases[i] = Reader.ReadCXXBaseSpecifier(Cursor, Record, Idx);
764
765    Reader.ReadUnresolvedSet(Data.Conversions, Record, Idx);
766    Reader.ReadUnresolvedSet(Data.VisibleConversions, Record, Idx);
767    assert(Data.Definition && "Data.Definition should be already set!");
768    Data.FirstFriend
769        = cast_or_null<FriendDecl>(Reader.GetDecl(Record[Idx++]));
770  }
771
772  enum CXXRecKind {
773    CXXRecNotTemplate = 0, CXXRecTemplate, CXXRecMemberSpecialization
774  };
775  switch ((CXXRecKind)Record[Idx++]) {
776  default:
777    assert(false && "Out of sync with ASTDeclWriter::VisitCXXRecordDecl?");
778  case CXXRecNotTemplate:
779    break;
780  case CXXRecTemplate:
781    D->setDescribedClassTemplate(
782                        cast<ClassTemplateDecl>(Reader.GetDecl(Record[Idx++])));
783    break;
784  case CXXRecMemberSpecialization: {
785    CXXRecordDecl *RD = cast<CXXRecordDecl>(Reader.GetDecl(Record[Idx++]));
786    TemplateSpecializationKind TSK = (TemplateSpecializationKind)Record[Idx++];
787    SourceLocation POI = Reader.ReadSourceLocation(Record, Idx);
788    D->setInstantiationOfMemberClass(RD, TSK);
789    D->getMemberSpecializationInfo()->setPointOfInstantiation(POI);
790    break;
791  }
792  }
793}
794
795void ASTDeclReader::VisitCXXMethodDecl(CXXMethodDecl *D) {
796  VisitFunctionDecl(D);
797  unsigned NumOverridenMethods = Record[Idx++];
798  while (NumOverridenMethods--) {
799    CXXMethodDecl *MD = cast<CXXMethodDecl>(Reader.GetDecl(Record[Idx++]));
800    // Avoid invariant checking of CXXMethodDecl::addOverriddenMethod,
801    // MD may be initializing.
802    Reader.getContext()->addOverriddenMethod(D, MD);
803  }
804}
805
806void ASTDeclReader::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
807  VisitCXXMethodDecl(D);
808
809  D->IsExplicitSpecified = Record[Idx++];
810  D->ImplicitlyDefined = Record[Idx++];
811  llvm::tie(D->BaseOrMemberInitializers, D->NumBaseOrMemberInitializers)
812      = Reader.ReadCXXBaseOrMemberInitializers(Cursor, Record, Idx);
813}
814
815void ASTDeclReader::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
816  VisitCXXMethodDecl(D);
817
818  D->ImplicitlyDefined = Record[Idx++];
819  D->OperatorDelete = cast_or_null<FunctionDecl>(Reader.GetDecl(Record[Idx++]));
820}
821
822void ASTDeclReader::VisitCXXConversionDecl(CXXConversionDecl *D) {
823  VisitCXXMethodDecl(D);
824  D->IsExplicitSpecified = Record[Idx++];
825}
826
827void ASTDeclReader::VisitAccessSpecDecl(AccessSpecDecl *D) {
828  VisitDecl(D);
829  D->setColonLoc(Reader.ReadSourceLocation(Record, Idx));
830}
831
832void ASTDeclReader::VisitFriendDecl(FriendDecl *D) {
833  VisitDecl(D);
834  if (Record[Idx++])
835    D->Friend = Reader.GetTypeSourceInfo(Cursor, Record, Idx);
836  else
837    D->Friend = cast<NamedDecl>(Reader.GetDecl(Record[Idx++]));
838  D->NextFriend = cast_or_null<FriendDecl>(Reader.GetDecl(Record[Idx++]));
839  D->FriendLoc = Reader.ReadSourceLocation(Record, Idx);
840}
841
842void ASTDeclReader::VisitFriendTemplateDecl(FriendTemplateDecl *D) {
843  VisitDecl(D);
844  unsigned NumParams = Record[Idx++];
845  D->NumParams = NumParams;
846  D->Params = new TemplateParameterList*[NumParams];
847  for (unsigned i = 0; i != NumParams; ++i)
848    D->Params[i] = Reader.ReadTemplateParameterList(Record, Idx);
849  if (Record[Idx++]) // HasFriendDecl
850    D->Friend = cast<NamedDecl>(Reader.GetDecl(Record[Idx++]));
851  else
852    D->Friend = Reader.GetTypeSourceInfo(Cursor, Record, Idx);
853  D->FriendLoc = Reader.ReadSourceLocation(Record, Idx);
854}
855
856void ASTDeclReader::VisitTemplateDecl(TemplateDecl *D) {
857  VisitNamedDecl(D);
858
859  NamedDecl *TemplatedDecl
860    = cast_or_null<NamedDecl>(Reader.GetDecl(Record[Idx++]));
861  TemplateParameterList* TemplateParams
862      = Reader.ReadTemplateParameterList(Record, Idx);
863  D->init(TemplatedDecl, TemplateParams);
864}
865
866void ASTDeclReader::VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D) {
867  VisitTemplateDecl(D);
868
869  D->IdentifierNamespace = Record[Idx++];
870  RedeclarableTemplateDecl *PrevDecl =
871      cast_or_null<RedeclarableTemplateDecl>(Reader.GetDecl(Record[Idx++]));
872  assert((PrevDecl == 0 || PrevDecl->getKind() == D->getKind()) &&
873         "PrevDecl kind mismatch");
874  if (PrevDecl)
875    D->CommonOrPrev = PrevDecl;
876  if (PrevDecl == 0) {
877    if (RedeclarableTemplateDecl *RTD
878          = cast_or_null<RedeclarableTemplateDecl>(Reader.GetDecl(Record[Idx++]))) {
879      assert(RTD->getKind() == D->getKind() &&
880             "InstantiatedFromMemberTemplate kind mismatch");
881      D->setInstantiatedFromMemberTemplateImpl(RTD);
882      if (Record[Idx++])
883        D->setMemberSpecialization();
884    }
885
886    RedeclarableTemplateDecl *LatestDecl =
887        cast_or_null<RedeclarableTemplateDecl>(Reader.GetDecl(Record[Idx++]));
888
889    // This decl is a first one and the latest declaration that it points to is
890    // in the same AST file. However, if this actually needs to point to a
891    // redeclaration in another AST file, we need to update it by checking
892    // the FirstLatestDeclIDs map which tracks this kind of decls.
893    assert(Reader.GetDecl(ThisDeclID) == D && "Invalid ThisDeclID ?");
894    ASTReader::FirstLatestDeclIDMap::iterator I
895        = Reader.FirstLatestDeclIDs.find(ThisDeclID);
896    if (I != Reader.FirstLatestDeclIDs.end()) {
897      Decl *NewLatest = Reader.GetDecl(I->second);
898      assert((LatestDecl->getLocation().isInvalid() ||
899              NewLatest->getLocation().isInvalid()  ||
900              Reader.SourceMgr.isBeforeInTranslationUnit(
901                                                   LatestDecl->getLocation(),
902                                                   NewLatest->getLocation())) &&
903             "The new latest is supposed to come after the previous latest");
904      LatestDecl = cast<RedeclarableTemplateDecl>(NewLatest);
905    }
906
907    assert(LatestDecl->getKind() == D->getKind() && "Latest kind mismatch");
908    D->getCommonPtr()->Latest = LatestDecl;
909  }
910}
911
912void ASTDeclReader::VisitClassTemplateDecl(ClassTemplateDecl *D) {
913  VisitRedeclarableTemplateDecl(D);
914
915  if (D->getPreviousDeclaration() == 0) {
916    // This ClassTemplateDecl owns a CommonPtr; read it.
917
918    // FoldingSets are filled in VisitClassTemplateSpecializationDecl.
919    unsigned size = Record[Idx++];
920    while (size--)
921      cast<ClassTemplateSpecializationDecl>(Reader.GetDecl(Record[Idx++]));
922
923    size = Record[Idx++];
924    while (size--)
925      cast<ClassTemplatePartialSpecializationDecl>(
926                                                 Reader.GetDecl(Record[Idx++]));
927
928    // InjectedClassNameType is computed.
929  }
930}
931
932void ASTDeclReader::VisitClassTemplateSpecializationDecl(
933                                           ClassTemplateSpecializationDecl *D) {
934  VisitCXXRecordDecl(D);
935
936  if (Decl *InstD = Reader.GetDecl(Record[Idx++])) {
937    if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(InstD)) {
938      D->setInstantiationOf(CTD);
939    } else {
940      llvm::SmallVector<TemplateArgument, 8> TemplArgs;
941      Reader.ReadTemplateArgumentList(TemplArgs, Cursor, Record, Idx);
942      D->setInstantiationOf(cast<ClassTemplatePartialSpecializationDecl>(InstD),
943                            TemplArgs.data(), TemplArgs.size());
944    }
945  }
946
947  // Explicit info.
948  if (TypeSourceInfo *TyInfo = Reader.GetTypeSourceInfo(Cursor, Record, Idx)) {
949    D->setTypeAsWritten(TyInfo);
950    D->setExternLoc(Reader.ReadSourceLocation(Record, Idx));
951    D->setTemplateKeywordLoc(Reader.ReadSourceLocation(Record, Idx));
952  }
953
954  llvm::SmallVector<TemplateArgument, 8> TemplArgs;
955  Reader.ReadTemplateArgumentList(TemplArgs, Cursor, Record, Idx);
956  D->initTemplateArgs(TemplArgs.data(), TemplArgs.size());
957  SourceLocation POI = Reader.ReadSourceLocation(Record, Idx);
958  if (POI.isValid())
959    D->setPointOfInstantiation(POI);
960  D->setSpecializationKind((TemplateSpecializationKind)Record[Idx++]);
961
962  if (D->isCanonicalDecl()) { // It's kept in the folding set.
963    ClassTemplateDecl *CanonPattern
964                       = cast<ClassTemplateDecl>(Reader.GetDecl(Record[Idx++]));
965    if (ClassTemplatePartialSpecializationDecl *Partial
966            = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) {
967      CanonPattern->getPartialSpecializations().InsertNode(Partial);
968    } else {
969      CanonPattern->getSpecializations().InsertNode(D);
970    }
971  }
972}
973
974void ASTDeclReader::VisitClassTemplatePartialSpecializationDecl(
975                                    ClassTemplatePartialSpecializationDecl *D) {
976  VisitClassTemplateSpecializationDecl(D);
977
978  D->initTemplateParameters(Reader.ReadTemplateParameterList(Record, Idx));
979
980  TemplateArgumentListInfo ArgInfos;
981  unsigned NumArgs = Record[Idx++];
982  while (NumArgs--)
983    ArgInfos.addArgument(Reader.ReadTemplateArgumentLoc(Cursor, Record, Idx));
984  D->initTemplateArgsAsWritten(ArgInfos);
985
986  D->setSequenceNumber(Record[Idx++]);
987
988  // These are read/set from/to the first declaration.
989  if (D->getPreviousDeclaration() == 0) {
990    D->setInstantiatedFromMember(
991        cast_or_null<ClassTemplatePartialSpecializationDecl>(
992                                                Reader.GetDecl(Record[Idx++])));
993    if (Record[Idx++])
994      D->setMemberSpecialization();
995  }
996}
997
998void ASTDeclReader::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
999  VisitRedeclarableTemplateDecl(D);
1000
1001  if (D->getPreviousDeclaration() == 0) {
1002    // This FunctionTemplateDecl owns a CommonPtr; read it.
1003
1004    // Read the function specialization declarations.
1005    // FunctionTemplateDecl's FunctionTemplateSpecializationInfos are filled
1006    // through the specialized FunctionDecl's setFunctionTemplateSpecialization.
1007    unsigned NumSpecs = Record[Idx++];
1008    while (NumSpecs--)
1009      Reader.GetDecl(Record[Idx++]);
1010  }
1011}
1012
1013void ASTDeclReader::VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D) {
1014  VisitTypeDecl(D);
1015
1016  D->setDeclaredWithTypename(Record[Idx++]);
1017  D->setParameterPack(Record[Idx++]);
1018
1019  bool Inherited = Record[Idx++];
1020  TypeSourceInfo *DefArg = Reader.GetTypeSourceInfo(Cursor, Record, Idx);
1021  D->setDefaultArgument(DefArg, Inherited);
1022}
1023
1024void ASTDeclReader::VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {
1025  VisitVarDecl(D);
1026  // TemplateParmPosition.
1027  D->setDepth(Record[Idx++]);
1028  D->setPosition(Record[Idx++]);
1029  // Rest of NonTypeTemplateParmDecl.
1030  if (Record[Idx++]) {
1031    Expr *DefArg = Reader.ReadExpr(Cursor);
1032    bool Inherited = Record[Idx++];
1033    D->setDefaultArgument(DefArg, Inherited);
1034 }
1035}
1036
1037void ASTDeclReader::VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D) {
1038  VisitTemplateDecl(D);
1039  // TemplateParmPosition.
1040  D->setDepth(Record[Idx++]);
1041  D->setPosition(Record[Idx++]);
1042  // Rest of TemplateTemplateParmDecl.
1043  TemplateArgumentLoc Arg = Reader.ReadTemplateArgumentLoc(Cursor, Record, Idx);
1044  bool IsInherited = Record[Idx++];
1045  D->setDefaultArgument(Arg, IsInherited);
1046}
1047
1048void ASTDeclReader::VisitStaticAssertDecl(StaticAssertDecl *D) {
1049  VisitDecl(D);
1050  D->AssertExpr = Reader.ReadExpr(Cursor);
1051  D->Message = cast<StringLiteral>(Reader.ReadExpr(Cursor));
1052}
1053
1054std::pair<uint64_t, uint64_t>
1055ASTDeclReader::VisitDeclContext(DeclContext *DC) {
1056  uint64_t LexicalOffset = Record[Idx++];
1057  uint64_t VisibleOffset = Record[Idx++];
1058  return std::make_pair(LexicalOffset, VisibleOffset);
1059}
1060
1061template <typename T>
1062void ASTDeclReader::VisitRedeclarable(Redeclarable<T> *D) {
1063  enum RedeclKind { NoRedeclaration = 0, PointsToPrevious, PointsToLatest };
1064  RedeclKind Kind = (RedeclKind)Record[Idx++];
1065  switch (Kind) {
1066  default:
1067    assert(0 && "Out of sync with ASTDeclWriter::VisitRedeclarable or messed up"
1068                " reading");
1069  case NoRedeclaration:
1070    break;
1071  case PointsToPrevious:
1072    D->RedeclLink = typename Redeclarable<T>::PreviousDeclLink(
1073                                cast_or_null<T>(Reader.GetDecl(Record[Idx++])));
1074    break;
1075  case PointsToLatest:
1076    D->RedeclLink = typename Redeclarable<T>::LatestDeclLink(
1077                                cast_or_null<T>(Reader.GetDecl(Record[Idx++])));
1078    break;
1079  }
1080
1081  assert(!(Kind == PointsToPrevious &&
1082           Reader.FirstLatestDeclIDs.find(ThisDeclID) !=
1083               Reader.FirstLatestDeclIDs.end()) &&
1084         "This decl is not first, it should not be in the map");
1085  if (Kind == PointsToPrevious)
1086    return;
1087
1088  // This decl is a first one and the latest declaration that it points to is in
1089  // the same AST file. However, if this actually needs to point to a
1090  // redeclaration in another AST file, we need to update it by checking the
1091  // FirstLatestDeclIDs map which tracks this kind of decls.
1092  assert(Reader.GetDecl(ThisDeclID) == static_cast<T*>(D) &&
1093         "Invalid ThisDeclID ?");
1094  ASTReader::FirstLatestDeclIDMap::iterator I
1095      = Reader.FirstLatestDeclIDs.find(ThisDeclID);
1096  if (I != Reader.FirstLatestDeclIDs.end()) {
1097    Decl *NewLatest = Reader.GetDecl(I->second);
1098    assert((D->getMostRecentDeclaration()->getLocation().isInvalid() ||
1099            NewLatest->getLocation().isInvalid() ||
1100            Reader.SourceMgr.isBeforeInTranslationUnit(
1101                                   D->getMostRecentDeclaration()->getLocation(),
1102                                   NewLatest->getLocation())) &&
1103           "The new latest is supposed to come after the previous latest");
1104    D->RedeclLink
1105        = typename Redeclarable<T>::LatestDeclLink(cast_or_null<T>(NewLatest));
1106  }
1107}
1108
1109//===----------------------------------------------------------------------===//
1110// Attribute Reading
1111//===----------------------------------------------------------------------===//
1112
1113/// \brief Reads attributes from the current stream position.
1114void ASTReader::ReadAttributes(llvm::BitstreamCursor &DeclsCursor,
1115                               AttrVec &Attrs) {
1116  unsigned Code = DeclsCursor.ReadCode();
1117  assert(Code == llvm::bitc::UNABBREV_RECORD &&
1118         "Expected unabbreviated record"); (void)Code;
1119
1120  RecordData Record;
1121  unsigned Idx = 0;
1122  unsigned RecCode = DeclsCursor.ReadRecord(Code, Record);
1123  assert(RecCode == DECL_ATTR && "Expected attribute record");
1124  (void)RecCode;
1125
1126  while (Idx < Record.size()) {
1127    Attr *New = 0;
1128    attr::Kind Kind = (attr::Kind)Record[Idx++];
1129    SourceLocation Loc = SourceLocation::getFromRawEncoding(Record[Idx++]);
1130    bool isInherited = Record[Idx++];
1131
1132#include "clang/Serialization/AttrPCHRead.inc"
1133
1134    assert(New && "Unable to decode attribute?");
1135    New->setInherited(isInherited);
1136    Attrs.push_back(New);
1137  }
1138}
1139
1140//===----------------------------------------------------------------------===//
1141// ASTReader Implementation
1142//===----------------------------------------------------------------------===//
1143
1144/// \brief Note that we have loaded the declaration with the given
1145/// Index.
1146///
1147/// This routine notes that this declaration has already been loaded,
1148/// so that future GetDecl calls will return this declaration rather
1149/// than trying to load a new declaration.
1150inline void ASTReader::LoadedDecl(unsigned Index, Decl *D) {
1151  assert(!DeclsLoaded[Index] && "Decl loaded twice?");
1152  DeclsLoaded[Index] = D;
1153}
1154
1155
1156/// \brief Determine whether the consumer will be interested in seeing
1157/// this declaration (via HandleTopLevelDecl).
1158///
1159/// This routine should return true for anything that might affect
1160/// code generation, e.g., inline function definitions, Objective-C
1161/// declarations with metadata, etc.
1162static bool isConsumerInterestedIn(Decl *D) {
1163  if (isa<FileScopeAsmDecl>(D))
1164    return true;
1165  if (VarDecl *Var = dyn_cast<VarDecl>(D))
1166    return Var->isFileVarDecl() &&
1167           Var->isThisDeclarationADefinition() == VarDecl::Definition;
1168  if (FunctionDecl *Func = dyn_cast<FunctionDecl>(D))
1169    return Func->isThisDeclarationADefinition();
1170  return isa<ObjCProtocolDecl>(D) || isa<ObjCImplementationDecl>(D);
1171}
1172
1173/// \brief Get the correct cursor and offset for loading a type.
1174ASTReader::RecordLocation
1175ASTReader::DeclCursorForIndex(unsigned Index, DeclID ID) {
1176  // See if there's an override.
1177  DeclReplacementMap::iterator It = ReplacedDecls.find(ID);
1178  if (It != ReplacedDecls.end())
1179    return RecordLocation(&It->second.first->DeclsCursor, It->second.second);
1180
1181  PerFileData *F = 0;
1182  for (unsigned I = 0, N = Chain.size(); I != N; ++I) {
1183    F = Chain[N - I - 1];
1184    if (Index < F->LocalNumDecls)
1185      break;
1186    Index -= F->LocalNumDecls;
1187  }
1188  assert(F && F->LocalNumDecls > Index && "Broken chain");
1189  return RecordLocation(&F->DeclsCursor, F->DeclOffsets[Index]);
1190}
1191
1192/// \brief Read the declaration at the given offset from the AST file.
1193Decl *ASTReader::ReadDeclRecord(unsigned Index, DeclID ID) {
1194  RecordLocation Loc = DeclCursorForIndex(Index, ID);
1195  llvm::BitstreamCursor &DeclsCursor = *Loc.first;
1196  // Keep track of where we are in the stream, then jump back there
1197  // after reading this declaration.
1198  SavedStreamPosition SavedPosition(DeclsCursor);
1199
1200  ReadingKindTracker ReadingKind(Read_Decl, *this);
1201
1202  // Note that we are loading a declaration record.
1203  Deserializing ADecl(this);
1204
1205  DeclsCursor.JumpToBit(Loc.second);
1206  RecordData Record;
1207  unsigned Code = DeclsCursor.ReadCode();
1208  unsigned Idx = 0;
1209  ASTDeclReader Reader(*this, DeclsCursor, ID, Record, Idx);
1210
1211  Decl *D = 0;
1212  switch ((DeclCode)DeclsCursor.ReadRecord(Code, Record)) {
1213  case DECL_ATTR:
1214  case DECL_CONTEXT_LEXICAL:
1215  case DECL_CONTEXT_VISIBLE:
1216    assert(false && "Record cannot be de-serialized with ReadDeclRecord");
1217    break;
1218  case DECL_TRANSLATION_UNIT:
1219    assert(Index == 0 && "Translation unit must be at index 0");
1220    D = Context->getTranslationUnitDecl();
1221    break;
1222  case DECL_TYPEDEF:
1223    D = TypedefDecl::Create(*Context, 0, SourceLocation(), 0, 0);
1224    break;
1225  case DECL_ENUM:
1226    D = EnumDecl::Create(*Context, Decl::EmptyShell());
1227    break;
1228  case DECL_RECORD:
1229    D = RecordDecl::Create(*Context, Decl::EmptyShell());
1230    break;
1231  case DECL_ENUM_CONSTANT:
1232    D = EnumConstantDecl::Create(*Context, 0, SourceLocation(), 0, QualType(),
1233                                 0, llvm::APSInt());
1234    break;
1235  case DECL_FUNCTION:
1236    D = FunctionDecl::Create(*Context, 0, SourceLocation(), DeclarationName(),
1237                             QualType(), 0);
1238    break;
1239  case DECL_LINKAGE_SPEC:
1240    D = LinkageSpecDecl::Create(*Context, 0, SourceLocation(),
1241                                (LinkageSpecDecl::LanguageIDs)0,
1242                                false);
1243    break;
1244  case DECL_NAMESPACE:
1245    D = NamespaceDecl::Create(*Context, 0, SourceLocation(), 0);
1246    break;
1247  case DECL_NAMESPACE_ALIAS:
1248    D = NamespaceAliasDecl::Create(*Context, 0, SourceLocation(),
1249                                   SourceLocation(), 0, SourceRange(), 0,
1250                                   SourceLocation(), 0);
1251    break;
1252  case DECL_USING:
1253    D = UsingDecl::Create(*Context, 0, SourceRange(), SourceLocation(),
1254                          0, DeclarationNameInfo(), false);
1255    break;
1256  case DECL_USING_SHADOW:
1257    D = UsingShadowDecl::Create(*Context, 0, SourceLocation(), 0, 0);
1258    break;
1259  case DECL_USING_DIRECTIVE:
1260    D = UsingDirectiveDecl::Create(*Context, 0, SourceLocation(),
1261                                   SourceLocation(), SourceRange(), 0,
1262                                   SourceLocation(), 0, 0);
1263    break;
1264  case DECL_UNRESOLVED_USING_VALUE:
1265    D = UnresolvedUsingValueDecl::Create(*Context, 0, SourceLocation(),
1266                                         SourceRange(), 0,
1267                                         DeclarationNameInfo());
1268    break;
1269  case DECL_UNRESOLVED_USING_TYPENAME:
1270    D = UnresolvedUsingTypenameDecl::Create(*Context, 0, SourceLocation(),
1271                                            SourceLocation(), SourceRange(),
1272                                            0, SourceLocation(),
1273                                            DeclarationName());
1274    break;
1275  case DECL_CXX_RECORD:
1276    D = CXXRecordDecl::Create(*Context, Decl::EmptyShell());
1277    break;
1278  case DECL_CXX_METHOD:
1279    D = CXXMethodDecl::Create(*Context, 0, DeclarationNameInfo(),
1280                              QualType(), 0);
1281    break;
1282  case DECL_CXX_CONSTRUCTOR:
1283    D = CXXConstructorDecl::Create(*Context, Decl::EmptyShell());
1284    break;
1285  case DECL_CXX_DESTRUCTOR:
1286    D = CXXDestructorDecl::Create(*Context, Decl::EmptyShell());
1287    break;
1288  case DECL_CXX_CONVERSION:
1289    D = CXXConversionDecl::Create(*Context, Decl::EmptyShell());
1290    break;
1291  case DECL_ACCESS_SPEC:
1292    D = AccessSpecDecl::Create(*Context, AS_none, 0, SourceLocation(),
1293                               SourceLocation());
1294    break;
1295  case DECL_FRIEND:
1296    D = FriendDecl::Create(*Context, Decl::EmptyShell());
1297    break;
1298  case DECL_FRIEND_TEMPLATE:
1299    D = FriendTemplateDecl::Create(*Context, Decl::EmptyShell());
1300    break;
1301  case DECL_CLASS_TEMPLATE:
1302    D = ClassTemplateDecl::Create(*Context, 0, SourceLocation(),
1303                                  DeclarationName(), 0, 0, 0);
1304    break;
1305  case DECL_CLASS_TEMPLATE_SPECIALIZATION:
1306    D = ClassTemplateSpecializationDecl::Create(*Context, Decl::EmptyShell());
1307    break;
1308  case DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION:
1309    D = ClassTemplatePartialSpecializationDecl::Create(*Context,
1310                                                            Decl::EmptyShell());
1311    break;
1312  case DECL_FUNCTION_TEMPLATE:
1313    D = FunctionTemplateDecl::Create(*Context, 0, SourceLocation(),
1314                                     DeclarationName(), 0, 0);
1315    break;
1316  case DECL_TEMPLATE_TYPE_PARM:
1317    D = TemplateTypeParmDecl::Create(*Context, Decl::EmptyShell());
1318    break;
1319  case DECL_NON_TYPE_TEMPLATE_PARM:
1320    D = NonTypeTemplateParmDecl::Create(*Context, 0, SourceLocation(), 0,0,0,
1321                                        QualType(),0);
1322    break;
1323  case DECL_TEMPLATE_TEMPLATE_PARM:
1324    D = TemplateTemplateParmDecl::Create(*Context, 0, SourceLocation(),0,0,0,0);
1325    break;
1326  case DECL_STATIC_ASSERT:
1327    D = StaticAssertDecl::Create(*Context, 0, SourceLocation(), 0, 0);
1328    break;
1329
1330  case DECL_OBJC_METHOD:
1331    D = ObjCMethodDecl::Create(*Context, SourceLocation(), SourceLocation(),
1332                               Selector(), QualType(), 0, 0);
1333    break;
1334  case DECL_OBJC_INTERFACE:
1335    D = ObjCInterfaceDecl::Create(*Context, 0, SourceLocation(), 0);
1336    break;
1337  case DECL_OBJC_IVAR:
1338    D = ObjCIvarDecl::Create(*Context, 0, SourceLocation(), 0, QualType(), 0,
1339                             ObjCIvarDecl::None);
1340    break;
1341  case DECL_OBJC_PROTOCOL:
1342    D = ObjCProtocolDecl::Create(*Context, 0, SourceLocation(), 0);
1343    break;
1344  case DECL_OBJC_AT_DEFS_FIELD:
1345    D = ObjCAtDefsFieldDecl::Create(*Context, 0, SourceLocation(), 0,
1346                                    QualType(), 0);
1347    break;
1348  case DECL_OBJC_CLASS:
1349    D = ObjCClassDecl::Create(*Context, 0, SourceLocation());
1350    break;
1351  case DECL_OBJC_FORWARD_PROTOCOL:
1352    D = ObjCForwardProtocolDecl::Create(*Context, 0, SourceLocation());
1353    break;
1354  case DECL_OBJC_CATEGORY:
1355    D = ObjCCategoryDecl::Create(*Context, 0, SourceLocation(),
1356                                 SourceLocation(), SourceLocation(), 0);
1357    break;
1358  case DECL_OBJC_CATEGORY_IMPL:
1359    D = ObjCCategoryImplDecl::Create(*Context, 0, SourceLocation(), 0, 0);
1360    break;
1361  case DECL_OBJC_IMPLEMENTATION:
1362    D = ObjCImplementationDecl::Create(*Context, 0, SourceLocation(), 0, 0);
1363    break;
1364  case DECL_OBJC_COMPATIBLE_ALIAS:
1365    D = ObjCCompatibleAliasDecl::Create(*Context, 0, SourceLocation(), 0, 0);
1366    break;
1367  case DECL_OBJC_PROPERTY:
1368    D = ObjCPropertyDecl::Create(*Context, 0, SourceLocation(), 0, SourceLocation(),
1369                                 0);
1370    break;
1371  case DECL_OBJC_PROPERTY_IMPL:
1372    D = ObjCPropertyImplDecl::Create(*Context, 0, SourceLocation(),
1373                                     SourceLocation(), 0,
1374                                     ObjCPropertyImplDecl::Dynamic, 0);
1375    break;
1376  case DECL_FIELD:
1377    D = FieldDecl::Create(*Context, 0, SourceLocation(), 0, QualType(), 0, 0,
1378                          false);
1379    break;
1380  case DECL_VAR:
1381    D = VarDecl::Create(*Context, 0, SourceLocation(), 0, QualType(), 0,
1382                        SC_None, SC_None);
1383    break;
1384
1385  case DECL_IMPLICIT_PARAM:
1386    D = ImplicitParamDecl::Create(*Context, 0, SourceLocation(), 0, QualType());
1387    break;
1388
1389  case DECL_PARM_VAR:
1390    D = ParmVarDecl::Create(*Context, 0, SourceLocation(), 0, QualType(), 0,
1391                            SC_None, SC_None, 0);
1392    break;
1393  case DECL_FILE_SCOPE_ASM:
1394    D = FileScopeAsmDecl::Create(*Context, 0, SourceLocation(), 0);
1395    break;
1396  case DECL_BLOCK:
1397    D = BlockDecl::Create(*Context, 0, SourceLocation());
1398    break;
1399  }
1400
1401  assert(D && "Unknown declaration reading AST file");
1402  LoadedDecl(Index, D);
1403  Reader.Visit(D);
1404
1405  // If this declaration is also a declaration context, get the
1406  // offsets for its tables of lexical and visible declarations.
1407  if (DeclContext *DC = dyn_cast<DeclContext>(D)) {
1408    std::pair<uint64_t, uint64_t> Offsets = Reader.VisitDeclContext(DC);
1409    if (Offsets.first || Offsets.second) {
1410      DC->setHasExternalLexicalStorage(Offsets.first != 0);
1411      DC->setHasExternalVisibleStorage(Offsets.second != 0);
1412      DeclContextInfo Info;
1413      if (ReadDeclContextStorage(DeclsCursor, Offsets, Info))
1414        return 0;
1415      DeclContextInfos &Infos = DeclContextOffsets[DC];
1416      // Reading the TU will happen after reading its lexical update blocks,
1417      // so we need to make sure we insert in front. For all other contexts,
1418      // the vector is empty here anyway, so there's no loss in efficiency.
1419      Infos.insert(Infos.begin(), Info);
1420
1421      // Now add the pending visible updates for this decl context, if it has
1422      // any.
1423      DeclContextVisibleUpdatesPending::iterator I =
1424          PendingVisibleUpdates.find(ID);
1425      if (I != PendingVisibleUpdates.end()) {
1426        DeclContextVisibleUpdates &U = I->second;
1427        Info.LexicalDecls = 0;
1428        Info.NumLexicalDecls = 0;
1429        for (DeclContextVisibleUpdates::iterator UI = U.begin(), UE = U.end();
1430             UI != UE; ++UI) {
1431          Info.NameLookupTableData = *UI;
1432          Infos.push_back(Info);
1433        }
1434        PendingVisibleUpdates.erase(I);
1435      }
1436    }
1437  }
1438
1439  // If this is a template, read additional specializations that may be in a
1440  // different part of the chain.
1441  if (isa<RedeclarableTemplateDecl>(D)) {
1442    AdditionalTemplateSpecializationsMap::iterator F =
1443        AdditionalTemplateSpecializationsPending.find(ID);
1444    if (F != AdditionalTemplateSpecializationsPending.end()) {
1445      for (AdditionalTemplateSpecializations::iterator I = F->second.begin(),
1446                                                       E = F->second.end();
1447           I != E; ++I)
1448        GetDecl(*I);
1449      AdditionalTemplateSpecializationsPending.erase(F);
1450    }
1451  }
1452  assert(Idx == Record.size());
1453
1454  // If we have deserialized a declaration that has a definition the
1455  // AST consumer might need to know about, queue it.
1456  // We don't pass it to the consumer immediately because we may be in recursive
1457  // loading, and some declarations may still be initializing.
1458  if (isConsumerInterestedIn(D))
1459    InterestingDecls.push_back(D);
1460
1461  return D;
1462}
1463