lib/Serialization/ASTWriterDecl.cpp

   1 //===--- ASTWriterDecl.cpp - Declaration Serialization --------------------===//
   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 serialization for Declarations.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "clang/Serialization/ASTWriter.h"
  15 #include "clang/Serialization/ASTReader.h"
  16 #include "ASTCommon.h"
  17 #include "clang/AST/DeclVisitor.h"
  18 #include "clang/AST/DeclCXX.h"
  19 #include "clang/AST/DeclTemplate.h"
  20 #include "clang/AST/Expr.h"
  21 #include "clang/AST/DeclContextInternals.h"
  22 #include "clang/Basic/SourceManager.h"
  23 #include "llvm/ADT/Twine.h"
  24 #include "llvm/Bitcode/BitstreamWriter.h"
  25 #include "llvm/Support/ErrorHandling.h"
  26 using namespace clang;
  27 using namespace serialization;
  28
  29 //===----------------------------------------------------------------------===//
  30 // Declaration serialization
  31 //===----------------------------------------------------------------------===//
  32
  33 namespace clang {
  34   class ASTDeclWriter : public DeclVisitor<ASTDeclWriter, void> {
  35
  36     ASTWriter &Writer;
  37     ASTContext &Context;
  38     typedef ASTWriter::RecordData RecordData;
  39     RecordData &Record;
  40
  41   public:
  42     serialization::DeclCode Code;
  43     unsigned AbbrevToUse;
  44
  45     ASTDeclWriter(ASTWriter &Writer, ASTContext &Context, RecordData &Record)
  46       : Writer(Writer), Context(Context), Record(Record) {
  47     }
  48
  49     void Visit(Decl *D);
  50
  51     void VisitDecl(Decl *D);
  52     void VisitTranslationUnitDecl(TranslationUnitDecl *D);
  53     void VisitNamedDecl(NamedDecl *D);
  54     void VisitLabelDecl(LabelDecl *LD);
  55     void VisitNamespaceDecl(NamespaceDecl *D);
  56     void VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
  57     void VisitNamespaceAliasDecl(NamespaceAliasDecl *D);
  58     void VisitTypeDecl(TypeDecl *D);
  59     void VisitTypedefNameDecl(TypedefNameDecl *D);
  60     void VisitTypedefDecl(TypedefDecl *D);
  61     void VisitTypeAliasDecl(TypeAliasDecl *D);
  62     void VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
  63     void VisitTagDecl(TagDecl *D);
  64     void VisitEnumDecl(EnumDecl *D);
  65     void VisitRecordDecl(RecordDecl *D);
  66     void VisitCXXRecordDecl(CXXRecordDecl *D);
  67     void VisitClassTemplateSpecializationDecl(
  68                                             ClassTemplateSpecializationDecl *D);
  69     void VisitClassTemplatePartialSpecializationDecl(
  70                                      ClassTemplatePartialSpecializationDecl *D);
  71     void VisitClassScopeFunctionSpecializationDecl(
  72                                        ClassScopeFunctionSpecializationDecl *D);
  73     void VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D);
  74     void VisitValueDecl(ValueDecl *D);
  75     void VisitEnumConstantDecl(EnumConstantDecl *D);
  76     void VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
  77     void VisitDeclaratorDecl(DeclaratorDecl *D);
  78     void VisitFunctionDecl(FunctionDecl *D);
  79     void VisitCXXMethodDecl(CXXMethodDecl *D);
  80     void VisitCXXConstructorDecl(CXXConstructorDecl *D);
  81     void VisitCXXDestructorDecl(CXXDestructorDecl *D);
  82     void VisitCXXConversionDecl(CXXConversionDecl *D);
  83     void VisitFieldDecl(FieldDecl *D);
  84     void VisitIndirectFieldDecl(IndirectFieldDecl *D);
  85     void VisitVarDecl(VarDecl *D);
  86     void VisitImplicitParamDecl(ImplicitParamDecl *D);
  87     void VisitParmVarDecl(ParmVarDecl *D);
  88     void VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D);
  89     void VisitTemplateDecl(TemplateDecl *D);
  90     void VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D);
  91     void VisitClassTemplateDecl(ClassTemplateDecl *D);
  92     void VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
  93     void VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D);
  94     void VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D);
  95     void VisitUsingDecl(UsingDecl *D);
  96     void VisitUsingShadowDecl(UsingShadowDecl *D);
  97     void VisitLinkageSpecDecl(LinkageSpecDecl *D);
  98     void VisitFileScopeAsmDecl(FileScopeAsmDecl *D);
  99     void VisitImportDecl(ImportDecl *D);
 100     void VisitAccessSpecDecl(AccessSpecDecl *D);
 101     void VisitFriendDecl(FriendDecl *D);
 102     void VisitFriendTemplateDecl(FriendTemplateDecl *D);
 103     void VisitStaticAssertDecl(StaticAssertDecl *D);
 104     void VisitBlockDecl(BlockDecl *D);
 105
 106     void VisitDeclContext(DeclContext *DC, uint64_t LexicalOffset,
 107                           uint64_t VisibleOffset);
 108     template <typename T> void VisitRedeclarable(Redeclarable<T> *D);
 109
 110
 111     // FIXME: Put in the same order is DeclNodes.td?
 112     void VisitObjCMethodDecl(ObjCMethodDecl *D);
 113     void VisitObjCContainerDecl(ObjCContainerDecl *D);
 114     void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
 115     void VisitObjCIvarDecl(ObjCIvarDecl *D);
 116     void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
 117     void VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D);
 118     void VisitObjCCategoryDecl(ObjCCategoryDecl *D);
 119     void VisitObjCImplDecl(ObjCImplDecl *D);
 120     void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
 121     void VisitObjCImplementationDecl(ObjCImplementationDecl *D);
 122     void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D);
 123     void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
 124     void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
 125   };
 126 }
 127
 128 void ASTDeclWriter::Visit(Decl *D) {
 129   DeclVisitor<ASTDeclWriter>::Visit(D);
 130
 131   // Source locations require array (variable-length) abbreviations.  The
 132   // abbreviation infrastructure requires that arrays are encoded last, so
 133   // we handle it here in the case of those classes derived from DeclaratorDecl
 134   if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)){
 135     Writer.AddTypeSourceInfo(DD->getTypeSourceInfo(), Record);
 136   }
 137
 138   // Handle FunctionDecl's body here and write it after all other Stmts/Exprs
 139   // have been written. We want it last because we will not read it back when
 140   // retrieving it from the AST, we'll just lazily set the offset.
 141   if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
 142     Record.push_back(FD->doesThisDeclarationHaveABody());
 143     if (FD->doesThisDeclarationHaveABody())
 144       Writer.AddStmt(FD->getBody());
 145   }
 146 }
 147
 148 void ASTDeclWriter::VisitDecl(Decl *D) {
 149   Writer.AddDeclRef(cast_or_null<Decl>(D->getDeclContext()), Record);
 150   Writer.AddDeclRef(cast_or_null<Decl>(D->getLexicalDeclContext()), Record);
 151   Record.push_back(D->isInvalidDecl());
 152   Record.push_back(D->hasAttrs());
 153   if (D->hasAttrs())
 154     Writer.WriteAttributes(D->getAttrs(), Record);
 155   Record.push_back(D->isImplicit());
 156   Record.push_back(D->isUsed(false));
 157   Record.push_back(D->isReferenced());
 158   Record.push_back(D->isTopLevelDeclInObjCContainer());
 159   Record.push_back(D->getAccess());
 160   Record.push_back(D->isModulePrivate());
 161   Record.push_back(Writer.inferSubmoduleIDFromLocation(D->getLocation()));
 162 }
 163
 164 void ASTDeclWriter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
 165   llvm_unreachable("Translation units aren't directly serialized");
 166 }
 167
 168 void ASTDeclWriter::VisitNamedDecl(NamedDecl *D) {
 169   VisitDecl(D);
 170   Writer.AddDeclarationName(D->getDeclName(), Record);
 171 }
 172
 173 void ASTDeclWriter::VisitTypeDecl(TypeDecl *D) {
 174   VisitNamedDecl(D);
 175   Writer.AddSourceLocation(D->getLocStart(), Record);
 176   Writer.AddTypeRef(QualType(D->getTypeForDecl(), 0), Record);
 177 }
 178
 179 void ASTDeclWriter::VisitTypedefNameDecl(TypedefNameDecl *D) {
 180   VisitRedeclarable(D);
 181   VisitTypeDecl(D);
 182   Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record);
 183 }
 184
 185 void ASTDeclWriter::VisitTypedefDecl(TypedefDecl *D) {
 186   VisitTypedefNameDecl(D);
 187   if (!D->hasAttrs() &&
 188       !D->isImplicit() &&
 189       !D->isUsed(false) &&
 190       D->getFirstDeclaration() == D->getMostRecentDecl() &&
 191       !D->isInvalidDecl() &&
 192       !D->isReferenced() &&
 193       !D->isTopLevelDeclInObjCContainer() &&
 194       D->getAccess() == AS_none &&
 195       !D->isModulePrivate() &&
 196       D->getDeclName().getNameKind() == DeclarationName::Identifier)
 197     AbbrevToUse = Writer.getDeclTypedefAbbrev();
 198
 199   Code = serialization::DECL_TYPEDEF;
 200 }
 201
 202 void ASTDeclWriter::VisitTypeAliasDecl(TypeAliasDecl *D) {
 203   VisitTypedefNameDecl(D);
 204   Code = serialization::DECL_TYPEALIAS;
 205 }
 206
 207 void ASTDeclWriter::VisitTagDecl(TagDecl *D) {
 208   VisitRedeclarable(D);
 209   VisitTypeDecl(D);
 210   Record.push_back(D->getIdentifierNamespace());
 211   Record.push_back((unsigned)D->getTagKind()); // FIXME: stable encoding
 212   Record.push_back(D->isCompleteDefinition());
 213   Record.push_back(D->isEmbeddedInDeclarator());
 214   Record.push_back(D->isFreeStanding());
 215   Writer.AddSourceLocation(D->getRBraceLoc(), Record);
 216   Record.push_back(D->hasExtInfo());
 217   if (D->hasExtInfo())
 218     Writer.AddQualifierInfo(*D->getExtInfo(), Record);
 219   else
 220     Writer.AddDeclRef(D->getTypedefNameForAnonDecl(), Record);
 221 }
 222
 223 void ASTDeclWriter::VisitEnumDecl(EnumDecl *D) {
 224   VisitTagDecl(D);
 225   Writer.AddTypeSourceInfo(D->getIntegerTypeSourceInfo(), Record);
 226   if (!D->getIntegerTypeSourceInfo())
 227     Writer.AddTypeRef(D->getIntegerType(), Record);
 228   Writer.AddTypeRef(D->getPromotionType(), Record);
 229   Record.push_back(D->getNumPositiveBits());
 230   Record.push_back(D->getNumNegativeBits());
 231   Record.push_back(D->isScoped());
 232   Record.push_back(D->isScopedUsingClassTag());
 233   Record.push_back(D->isFixed());
 234   if (MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo()) {
 235     Writer.AddDeclRef(MemberInfo->getInstantiatedFrom(), Record);
 236     Record.push_back(MemberInfo->getTemplateSpecializationKind());
 237     Writer.AddSourceLocation(MemberInfo->getPointOfInstantiation(), Record);
 238   } else {
 239     Writer.AddDeclRef(0, Record);
 240   }
 241
 242   if (!D->hasAttrs() &&
 243       !D->isImplicit() &&
 244       !D->isUsed(false) &&
 245       !D->hasExtInfo() &&
 246       D->getFirstDeclaration() == D->getMostRecentDecl() &&
 247       !D->isInvalidDecl() &&
 248       !D->isReferenced() &&
 249       !D->isTopLevelDeclInObjCContainer() &&
 250       D->getAccess() == AS_none &&
 251       !D->isModulePrivate() &&
 252       !CXXRecordDecl::classofKind(D->getKind()) &&
 253       !D->getIntegerTypeSourceInfo() &&
 254       D->getDeclName().getNameKind() == DeclarationName::Identifier)
 255     AbbrevToUse = Writer.getDeclEnumAbbrev();
 256
 257   Code = serialization::DECL_ENUM;
 258 }
 259
 260 void ASTDeclWriter::VisitRecordDecl(RecordDecl *D) {
 261   VisitTagDecl(D);
 262   Record.push_back(D->hasFlexibleArrayMember());
 263   Record.push_back(D->isAnonymousStructOrUnion());
 264   Record.push_back(D->hasObjectMember());
 265
 266   if (!D->hasAttrs() &&
 267       !D->isImplicit() &&
 268       !D->isUsed(false) &&
 269       !D->hasExtInfo() &&
 270       D->getFirstDeclaration() == D->getMostRecentDecl() &&
 271       !D->isInvalidDecl() &&
 272       !D->isReferenced() &&
 273       !D->isTopLevelDeclInObjCContainer() &&
 274       D->getAccess() == AS_none &&
 275       !D->isModulePrivate() &&
 276       !CXXRecordDecl::classofKind(D->getKind()) &&
 277       D->getDeclName().getNameKind() == DeclarationName::Identifier)
 278     AbbrevToUse = Writer.getDeclRecordAbbrev();
 279
 280   Code = serialization::DECL_RECORD;
 281 }
 282
 283 void ASTDeclWriter::VisitValueDecl(ValueDecl *D) {
 284   VisitNamedDecl(D);
 285   Writer.AddTypeRef(D->getType(), Record);
 286 }
 287
 288 void ASTDeclWriter::VisitEnumConstantDecl(EnumConstantDecl *D) {
 289   VisitValueDecl(D);
 290   Record.push_back(D->getInitExpr()? 1 : 0);
 291   if (D->getInitExpr())
 292     Writer.AddStmt(D->getInitExpr());
 293   Writer.AddAPSInt(D->getInitVal(), Record);
 294
 295   Code = serialization::DECL_ENUM_CONSTANT;
 296 }
 297
 298 void ASTDeclWriter::VisitDeclaratorDecl(DeclaratorDecl *D) {
 299   VisitValueDecl(D);
 300   Writer.AddSourceLocation(D->getInnerLocStart(), Record);
 301   Record.push_back(D->hasExtInfo());
 302   if (D->hasExtInfo())
 303     Writer.AddQualifierInfo(*D->getExtInfo(), Record);
 304 }
 305
 306 void ASTDeclWriter::VisitFunctionDecl(FunctionDecl *D) {
 307   VisitRedeclarable(D);
 308   VisitDeclaratorDecl(D);
 309
 310   Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
 311   Record.push_back(D->getIdentifierNamespace());
 312
 313   // FunctionDecl's body is handled last at ASTWriterDecl::Visit,
 314   // after everything else is written.
 315
 316   Record.push_back(D->getStorageClass()); // FIXME: stable encoding
 317   Record.push_back(D->getStorageClassAsWritten());
 318   Record.push_back(D->IsInline);
 319   Record.push_back(D->isInlineSpecified());
 320   Record.push_back(D->isVirtualAsWritten());
 321   Record.push_back(D->isPure());
 322   Record.push_back(D->hasInheritedPrototype());
 323   Record.push_back(D->hasWrittenPrototype());
 324   Record.push_back(D->isDeletedAsWritten());
 325   Record.push_back(D->isTrivial());
 326   Record.push_back(D->isDefaulted());
 327   Record.push_back(D->isExplicitlyDefaulted());
 328   Record.push_back(D->hasImplicitReturnZero());
 329   Record.push_back(D->isConstexpr());
 330   Writer.AddSourceLocation(D->getLocEnd(), Record);
 331
 332   Record.push_back(D->getTemplatedKind());
 333   switch (D->getTemplatedKind()) {
 334   case FunctionDecl::TK_NonTemplate:
 335     break;
 336   case FunctionDecl::TK_FunctionTemplate:
 337     Writer.AddDeclRef(D->getDescribedFunctionTemplate(), Record);
 338     break;
 339   case FunctionDecl::TK_MemberSpecialization: {
 340     MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo();
 341     Writer.AddDeclRef(MemberInfo->getInstantiatedFrom(), Record);
 342     Record.push_back(MemberInfo->getTemplateSpecializationKind());
 343     Writer.AddSourceLocation(MemberInfo->getPointOfInstantiation(), Record);
 344     break;
 345   }
 346   case FunctionDecl::TK_FunctionTemplateSpecialization: {
 347     FunctionTemplateSpecializationInfo *
 348       FTSInfo = D->getTemplateSpecializationInfo();
 349     Writer.AddDeclRef(FTSInfo->getTemplate(), Record);
 350     Record.push_back(FTSInfo->getTemplateSpecializationKind());
 351
 352     // Template arguments.
 353     Writer.AddTemplateArgumentList(FTSInfo->TemplateArguments, Record);
 354
 355     // Template args as written.
 356     Record.push_back(FTSInfo->TemplateArgumentsAsWritten != 0);
 357     if (FTSInfo->TemplateArgumentsAsWritten) {
 358       Record.push_back(FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs);
 359       for (int i=0, e = FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs;
 360              i!=e; ++i)
 361         Writer.AddTemplateArgumentLoc((*FTSInfo->TemplateArgumentsAsWritten)[i],
 362                                       Record);
 363       Writer.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->LAngleLoc,
 364                                Record);
 365       Writer.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->RAngleLoc,
 366                                Record);
 367     }
 368
 369     Writer.AddSourceLocation(FTSInfo->getPointOfInstantiation(), Record);
 370
 371     if (D->isCanonicalDecl()) {
 372       // Write the template that contains the specializations set. We will
 373       // add a FunctionTemplateSpecializationInfo to it when reading.
 374       Writer.AddDeclRef(FTSInfo->getTemplate()->getCanonicalDecl(), Record);
 375     }
 376     break;
 377   }
 378   case FunctionDecl::TK_DependentFunctionTemplateSpecialization: {
 379     DependentFunctionTemplateSpecializationInfo *
 380       DFTSInfo = D->getDependentSpecializationInfo();
 381
 382     // Templates.
 383     Record.push_back(DFTSInfo->getNumTemplates());
 384     for (int i=0, e = DFTSInfo->getNumTemplates(); i != e; ++i)
 385       Writer.AddDeclRef(DFTSInfo->getTemplate(i), Record);
 386
 387     // Templates args.
 388     Record.push_back(DFTSInfo->getNumTemplateArgs());
 389     for (int i=0, e = DFTSInfo->getNumTemplateArgs(); i != e; ++i)
 390       Writer.AddTemplateArgumentLoc(DFTSInfo->getTemplateArg(i), Record);
 391     Writer.AddSourceLocation(DFTSInfo->getLAngleLoc(), Record);
 392     Writer.AddSourceLocation(DFTSInfo->getRAngleLoc(), Record);
 393     break;
 394   }
 395   }
 396
 397   Record.push_back(D->param_size());
 398   for (FunctionDecl::param_iterator P = D->param_begin(), PEnd = D->param_end();
 399        P != PEnd; ++P)
 400     Writer.AddDeclRef(*P, Record);
 401   Code = serialization::DECL_FUNCTION;
 402 }
 403
 404 void ASTDeclWriter::VisitObjCMethodDecl(ObjCMethodDecl *D) {
 405   VisitNamedDecl(D);
 406   // FIXME: convert to LazyStmtPtr?
 407   // Unlike C/C++, method bodies will never be in header files.
 408   bool HasBodyStuff = D->getBody() != 0     ||
 409                       D->getSelfDecl() != 0 || D->getCmdDecl() != 0;
 410   Record.push_back(HasBodyStuff);
 411   if (HasBodyStuff) {
 412     Writer.AddStmt(D->getBody());
 413     Writer.AddDeclRef(D->getSelfDecl(), Record);
 414     Writer.AddDeclRef(D->getCmdDecl(), Record);
 415   }
 416   Record.push_back(D->isInstanceMethod());
 417   Record.push_back(D->isVariadic());
 418   Record.push_back(D->isSynthesized());
 419   Record.push_back(D->isDefined());
 420
 421   Record.push_back(D->IsRedeclaration);
 422   Record.push_back(D->HasRedeclaration);
 423   if (D->HasRedeclaration) {
 424     assert(Context.getObjCMethodRedeclaration(D));
 425     Writer.AddDeclRef(Context.getObjCMethodRedeclaration(D), Record);
 426   }
 427
 428   // FIXME: stable encoding for @required/@optional
 429   Record.push_back(D->getImplementationControl());
 430   // FIXME: stable encoding for in/out/inout/bycopy/byref/oneway
 431   Record.push_back(D->getObjCDeclQualifier());
 432   Record.push_back(D->hasRelatedResultType());
 433   Writer.AddTypeRef(D->getResultType(), Record);
 434   Writer.AddTypeSourceInfo(D->getResultTypeSourceInfo(), Record);
 435   Writer.AddSourceLocation(D->getLocEnd(), Record);
 436   Record.push_back(D->param_size());
 437   for (ObjCMethodDecl::param_iterator P = D->param_begin(),
 438                                    PEnd = D->param_end(); P != PEnd; ++P)
 439     Writer.AddDeclRef(*P, Record);
 440
 441   Record.push_back(D->SelLocsKind);
 442   unsigned NumStoredSelLocs = D->getNumStoredSelLocs();
 443   SourceLocation *SelLocs = D->getStoredSelLocs();
 444   Record.push_back(NumStoredSelLocs);
 445   for (unsigned i = 0; i != NumStoredSelLocs; ++i)
 446     Writer.AddSourceLocation(SelLocs[i], Record);
 447
 448   Code = serialization::DECL_OBJC_METHOD;
 449 }
 450
 451 void ASTDeclWriter::VisitObjCContainerDecl(ObjCContainerDecl *D) {
 452   VisitNamedDecl(D);
 453   Writer.AddSourceLocation(D->getAtStartLoc(), Record);
 454   Writer.AddSourceRange(D->getAtEndRange(), Record);
 455   // Abstract class (no need to define a stable serialization::DECL code).
 456 }
 457
 458 void ASTDeclWriter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *D) {
 459   VisitRedeclarable(D);
 460   VisitObjCContainerDecl(D);
 461   Writer.AddTypeRef(QualType(D->getTypeForDecl(), 0), Record);
 462
 463   Record.push_back(D->isThisDeclarationADefinition());
 464   if (D->isThisDeclarationADefinition()) {
 465     // Write the DefinitionData
 466     ObjCInterfaceDecl::DefinitionData &Data = D->data();
 467
 468     Writer.AddDeclRef(D->getSuperClass(), Record);
 469     Writer.AddSourceLocation(D->getSuperClassLoc(), Record);
 470     Writer.AddSourceLocation(D->getEndOfDefinitionLoc(), Record);
 471
 472     // Write out the protocols that are directly referenced by the @interface.
 473     Record.push_back(Data.ReferencedProtocols.size());
 474     for (ObjCInterfaceDecl::protocol_iterator P = D->protocol_begin(),
 475                                            PEnd = D->protocol_end();
 476          P != PEnd; ++P)
 477       Writer.AddDeclRef(*P, Record);
 478     for (ObjCInterfaceDecl::protocol_loc_iterator PL = D->protocol_loc_begin(),
 479          PLEnd = D->protocol_loc_end();
 480          PL != PLEnd; ++PL)
 481       Writer.AddSourceLocation(*PL, Record);
 482
 483     // Write out the protocols that are transitively referenced.
 484     Record.push_back(Data.AllReferencedProtocols.size());
 485     for (ObjCList<ObjCProtocolDecl>::iterator
 486               P = Data.AllReferencedProtocols.begin(),
 487            PEnd = Data.AllReferencedProtocols.end();
 488          P != PEnd; ++P)
 489       Writer.AddDeclRef(*P, Record);
 490
 491     if (ObjCCategoryDecl *Cat = D->getCategoryList()) {
 492       // Ensure that we write out the set of categories for this class.
 493       Writer.ObjCClassesWithCategories.insert(D);
 494
 495       // Make sure that the categories get serialized.
 496       for (; Cat; Cat = Cat->getNextClassCategory())
 497         (void)Writer.GetDeclRef(Cat);
 498     }
 499   }
 500
 501   Code = serialization::DECL_OBJC_INTERFACE;
 502 }
 503
 504 void ASTDeclWriter::VisitObjCIvarDecl(ObjCIvarDecl *D) {
 505   VisitFieldDecl(D);
 506   // FIXME: stable encoding for @public/@private/@protected/@package
 507   Record.push_back(D->getAccessControl());
 508   Record.push_back(D->getSynthesize());
 509
 510   if (!D->hasAttrs() &&
 511       !D->isImplicit() &&
 512       !D->isUsed(false) &&
 513       !D->isInvalidDecl() &&
 514       !D->isReferenced() &&
 515       !D->isModulePrivate() &&
 516       !D->getBitWidth() &&
 517       !D->hasExtInfo() &&
 518       D->getDeclName())
 519     AbbrevToUse = Writer.getDeclObjCIvarAbbrev();
 520
 521   Code = serialization::DECL_OBJC_IVAR;
 522 }
 523
 524 void ASTDeclWriter::VisitObjCProtocolDecl(ObjCProtocolDecl *D) {
 525   VisitRedeclarable(D);
 526   VisitObjCContainerDecl(D);
 527
 528   Record.push_back(D->isThisDeclarationADefinition());
 529   if (D->isThisDeclarationADefinition()) {
 530     Record.push_back(D->protocol_size());
 531     for (ObjCProtocolDecl::protocol_iterator
 532          I = D->protocol_begin(), IEnd = D->protocol_end(); I != IEnd; ++I)
 533       Writer.AddDeclRef(*I, Record);
 534     for (ObjCProtocolDecl::protocol_loc_iterator PL = D->protocol_loc_begin(),
 535            PLEnd = D->protocol_loc_end();
 536          PL != PLEnd; ++PL)
 537       Writer.AddSourceLocation(*PL, Record);
 538   }
 539
 540   Code = serialization::DECL_OBJC_PROTOCOL;
 541 }
 542
 543 void ASTDeclWriter::VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D) {
 544   VisitFieldDecl(D);
 545   Code = serialization::DECL_OBJC_AT_DEFS_FIELD;
 546 }
 547
 548 void ASTDeclWriter::VisitObjCCategoryDecl(ObjCCategoryDecl *D) {
 549   VisitObjCContainerDecl(D);
 550   Writer.AddSourceLocation(D->getCategoryNameLoc(), Record);
 551   Writer.AddSourceLocation(D->getIvarLBraceLoc(), Record);
 552   Writer.AddSourceLocation(D->getIvarRBraceLoc(), Record);
 553   Writer.AddDeclRef(D->getClassInterface(), Record);
 554   Record.push_back(D->protocol_size());
 555   for (ObjCCategoryDecl::protocol_iterator
 556        I = D->protocol_begin(), IEnd = D->protocol_end(); I != IEnd; ++I)
 557     Writer.AddDeclRef(*I, Record);
 558   for (ObjCCategoryDecl::protocol_loc_iterator
 559          PL = D->protocol_loc_begin(), PLEnd = D->protocol_loc_end();
 560        PL != PLEnd; ++PL)
 561     Writer.AddSourceLocation(*PL, Record);
 562   Record.push_back(D->hasSynthBitfield());
 563   Code = serialization::DECL_OBJC_CATEGORY;
 564 }
 565
 566 void ASTDeclWriter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D) {
 567   VisitNamedDecl(D);
 568   Writer.AddDeclRef(D->getClassInterface(), Record);
 569   Code = serialization::DECL_OBJC_COMPATIBLE_ALIAS;
 570 }
 571
 572 void ASTDeclWriter::VisitObjCPropertyDecl(ObjCPropertyDecl *D) {
 573   VisitNamedDecl(D);
 574   Writer.AddSourceLocation(D->getAtLoc(), Record);
 575   Writer.AddSourceLocation(D->getLParenLoc(), Record);
 576   Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record);
 577   // FIXME: stable encoding
 578   Record.push_back((unsigned)D->getPropertyAttributes());
 579   Record.push_back((unsigned)D->getPropertyAttributesAsWritten());
 580   // FIXME: stable encoding
 581   Record.push_back((unsigned)D->getPropertyImplementation());
 582   Writer.AddDeclarationName(D->getGetterName(), Record);
 583   Writer.AddDeclarationName(D->getSetterName(), Record);
 584   Writer.AddDeclRef(D->getGetterMethodDecl(), Record);
 585   Writer.AddDeclRef(D->getSetterMethodDecl(), Record);
 586   Writer.AddDeclRef(D->getPropertyIvarDecl(), Record);
 587   Code = serialization::DECL_OBJC_PROPERTY;
 588 }
 589
 590 void ASTDeclWriter::VisitObjCImplDecl(ObjCImplDecl *D) {
 591   VisitObjCContainerDecl(D);
 592   Writer.AddDeclRef(D->getClassInterface(), Record);
 593   // Abstract class (no need to define a stable serialization::DECL code).
 594 }
 595
 596 void ASTDeclWriter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D) {
 597   VisitObjCImplDecl(D);
 598   Writer.AddIdentifierRef(D->getIdentifier(), Record);
 599   Writer.AddSourceLocation(D->getCategoryNameLoc(), Record);
 600   Code = serialization::DECL_OBJC_CATEGORY_IMPL;
 601 }
 602
 603 void ASTDeclWriter::VisitObjCImplementationDecl(ObjCImplementationDecl *D) {
 604   VisitObjCImplDecl(D);
 605   Writer.AddDeclRef(D->getSuperClass(), Record);
 606   Writer.AddSourceLocation(D->getIvarLBraceLoc(), Record);
 607   Writer.AddSourceLocation(D->getIvarRBraceLoc(), Record);
 608   Writer.AddCXXCtorInitializers(D->IvarInitializers, D->NumIvarInitializers,
 609                                 Record);
 610   Record.push_back(D->hasSynthBitfield());
 611   Code = serialization::DECL_OBJC_IMPLEMENTATION;
 612 }
 613
 614 void ASTDeclWriter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D) {
 615   VisitDecl(D);
 616   Writer.AddSourceLocation(D->getLocStart(), Record);
 617   Writer.AddDeclRef(D->getPropertyDecl(), Record);
 618   Writer.AddDeclRef(D->getPropertyIvarDecl(), Record);
 619   Writer.AddSourceLocation(D->getPropertyIvarDeclLoc(), Record);
 620   Writer.AddStmt(D->getGetterCXXConstructor());
 621   Writer.AddStmt(D->getSetterCXXAssignment());
 622   Code = serialization::DECL_OBJC_PROPERTY_IMPL;
 623 }
 624
 625 void ASTDeclWriter::VisitFieldDecl(FieldDecl *D) {
 626   VisitDeclaratorDecl(D);
 627   Record.push_back(D->isMutable());
 628   Record.push_back(D->getBitWidth()? 1 : D->hasInClassInitializer() ? 2 : 0);
 629   if (D->getBitWidth())
 630     Writer.AddStmt(D->getBitWidth());
 631   else if (D->hasInClassInitializer())
 632     Writer.AddStmt(D->getInClassInitializer());
 633   if (!D->getDeclName())
 634     Writer.AddDeclRef(Context.getInstantiatedFromUnnamedFieldDecl(D), Record);
 635
 636   if (!D->hasAttrs() &&
 637       !D->isImplicit() &&
 638       !D->isUsed(false) &&
 639       !D->isInvalidDecl() &&
 640       !D->isReferenced() &&
 641       !D->isTopLevelDeclInObjCContainer() &&
 642       !D->isModulePrivate() &&
 643       !D->getBitWidth() &&
 644       !D->hasInClassInitializer() &&
 645       !D->hasExtInfo() &&
 646       !ObjCIvarDecl::classofKind(D->getKind()) &&
 647       !ObjCAtDefsFieldDecl::classofKind(D->getKind()) &&
 648       D->getDeclName())
 649     AbbrevToUse = Writer.getDeclFieldAbbrev();
 650
 651   Code = serialization::DECL_FIELD;
 652 }
 653
 654 void ASTDeclWriter::VisitIndirectFieldDecl(IndirectFieldDecl *D) {
 655   VisitValueDecl(D);
 656   Record.push_back(D->getChainingSize());
 657
 658   for (IndirectFieldDecl::chain_iterator
 659        P = D->chain_begin(),
 660        PEnd = D->chain_end(); P != PEnd; ++P)
 661     Writer.AddDeclRef(*P, Record);
 662   Code = serialization::DECL_INDIRECTFIELD;
 663 }
 664
 665 void ASTDeclWriter::VisitVarDecl(VarDecl *D) {
 666   VisitRedeclarable(D);
 667   VisitDeclaratorDecl(D);
 668   Record.push_back(D->getStorageClass()); // FIXME: stable encoding
 669   Record.push_back(D->getStorageClassAsWritten());
 670   Record.push_back(D->isThreadSpecified());
 671   Record.push_back(D->getInitStyle());
 672   Record.push_back(D->isExceptionVariable());
 673   Record.push_back(D->isNRVOVariable());
 674   Record.push_back(D->isCXXForRangeDecl());
 675   Record.push_back(D->isARCPseudoStrong());
 676   if (D->getInit()) {
 677     Record.push_back(!D->isInitKnownICE() ? 1 : (D->isInitICE() ? 3 : 2));
 678     Writer.AddStmt(D->getInit());
 679   } else {
 680     Record.push_back(0);
 681   }
 682
 683   MemberSpecializationInfo *SpecInfo
 684     = D->isStaticDataMember() ? D->getMemberSpecializationInfo() : 0;
 685   Record.push_back(SpecInfo != 0);
 686   if (SpecInfo) {
 687     Writer.AddDeclRef(SpecInfo->getInstantiatedFrom(), Record);
 688     Record.push_back(SpecInfo->getTemplateSpecializationKind());
 689     Writer.AddSourceLocation(SpecInfo->getPointOfInstantiation(), Record);
 690   }
 691
 692   if (!D->hasAttrs() &&
 693       !D->isImplicit() &&
 694       !D->isUsed(false) &&
 695       !D->isInvalidDecl() &&
 696       !D->isReferenced() &&
 697       !D->isTopLevelDeclInObjCContainer() &&
 698       D->getAccess() == AS_none &&
 699       !D->isModulePrivate() &&
 700       D->getDeclName().getNameKind() == DeclarationName::Identifier &&
 701       !D->hasExtInfo() &&
 702       D->getFirstDeclaration() == D->getMostRecentDecl() &&
 703       D->getInitStyle() == VarDecl::CInit &&
 704       D->getInit() == 0 &&
 705       !isa<ParmVarDecl>(D) &&
 706       !SpecInfo)
 707     AbbrevToUse = Writer.getDeclVarAbbrev();
 708
 709   Code = serialization::DECL_VAR;
 710 }
 711
 712 void ASTDeclWriter::VisitImplicitParamDecl(ImplicitParamDecl *D) {
 713   VisitVarDecl(D);
 714   Code = serialization::DECL_IMPLICIT_PARAM;
 715 }
 716
 717 void ASTDeclWriter::VisitParmVarDecl(ParmVarDecl *D) {
 718   VisitVarDecl(D);
 719   Record.push_back(D->isObjCMethodParameter());
 720   Record.push_back(D->getFunctionScopeDepth());
 721   Record.push_back(D->getFunctionScopeIndex());
 722   Record.push_back(D->getObjCDeclQualifier()); // FIXME: stable encoding
 723   Record.push_back(D->isKNRPromoted());
 724   Record.push_back(D->hasInheritedDefaultArg());
 725   Record.push_back(D->hasUninstantiatedDefaultArg());
 726   if (D->hasUninstantiatedDefaultArg())
 727     Writer.AddStmt(D->getUninstantiatedDefaultArg());
 728   Code = serialization::DECL_PARM_VAR;
 729
 730   assert(!D->isARCPseudoStrong()); // can be true of ImplicitParamDecl
 731
 732   // If the assumptions about the DECL_PARM_VAR abbrev are true, use it.  Here
 733   // we dynamically check for the properties that we optimize for, but don't
 734   // know are true of all PARM_VAR_DECLs.
 735   if (!D->hasAttrs() &&
 736       !D->hasExtInfo() &&
 737       !D->isImplicit() &&
 738       !D->isUsed(false) &&
 739       !D->isInvalidDecl() &&
 740       !D->isReferenced() &&
 741       D->getAccess() == AS_none &&
 742       !D->isModulePrivate() &&
 743       D->getStorageClass() == 0 &&
 744       D->getInitStyle() == VarDecl::CInit && // Can params have anything else?
 745       D->getFunctionScopeDepth() == 0 &&
 746       D->getObjCDeclQualifier() == 0 &&
 747       !D->isKNRPromoted() &&
 748       !D->hasInheritedDefaultArg() &&
 749       D->getInit() == 0 &&
 750       !D->hasUninstantiatedDefaultArg())  // No default expr.
 751     AbbrevToUse = Writer.getDeclParmVarAbbrev();
 752
 753   // Check things we know are true of *every* PARM_VAR_DECL, which is more than
 754   // just us assuming it.
 755   assert(!D->isThreadSpecified() && "PARM_VAR_DECL can't be __thread");
 756   assert(D->getAccess() == AS_none && "PARM_VAR_DECL can't be public/private");
 757   assert(!D->isExceptionVariable() && "PARM_VAR_DECL can't be exception var");
 758   assert(D->getPreviousDecl() == 0 && "PARM_VAR_DECL can't be redecl");
 759   assert(!D->isStaticDataMember() &&
 760          "PARM_VAR_DECL can't be static data member");
 761 }
 762
 763 void ASTDeclWriter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
 764   VisitDecl(D);
 765   Writer.AddStmt(D->getAsmString());
 766   Writer.AddSourceLocation(D->getRParenLoc(), Record);
 767   Code = serialization::DECL_FILE_SCOPE_ASM;
 768 }
 769
 770 void ASTDeclWriter::VisitBlockDecl(BlockDecl *D) {
 771   VisitDecl(D);
 772   Writer.AddStmt(D->getBody());
 773   Writer.AddTypeSourceInfo(D->getSignatureAsWritten(), Record);
 774   Record.push_back(D->param_size());
 775   for (FunctionDecl::param_iterator P = D->param_begin(), PEnd = D->param_end();
 776        P != PEnd; ++P)
 777     Writer.AddDeclRef(*P, Record);
 778   Record.push_back(D->capturesCXXThis());
 779   Record.push_back(D->getNumCaptures());
 780   for (BlockDecl::capture_iterator
 781          i = D->capture_begin(), e = D->capture_end(); i != e; ++i) {
 782     const BlockDecl::Capture &capture = *i;
 783     Writer.AddDeclRef(capture.getVariable(), Record);
 784
 785     unsigned flags = 0;
 786     if (capture.isByRef()) flags |= 1;
 787     if (capture.isNested()) flags |= 2;
 788     if (capture.hasCopyExpr()) flags |= 4;
 789     Record.push_back(flags);
 790
 791     if (capture.hasCopyExpr()) Writer.AddStmt(capture.getCopyExpr());
 792   }
 793
 794   Code = serialization::DECL_BLOCK;
 795 }
 796
 797 void ASTDeclWriter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
 798   VisitDecl(D);
 799   Record.push_back(D->getLanguage());
 800   Writer.AddSourceLocation(D->getExternLoc(), Record);
 801   Writer.AddSourceLocation(D->getRBraceLoc(), Record);
 802   Code = serialization::DECL_LINKAGE_SPEC;
 803 }
 804
 805 void ASTDeclWriter::VisitLabelDecl(LabelDecl *D) {
 806   VisitNamedDecl(D);
 807   Writer.AddSourceLocation(D->getLocStart(), Record);
 808   Code = serialization::DECL_LABEL;
 809 }
 810
 811
 812 void ASTDeclWriter::VisitNamespaceDecl(NamespaceDecl *D) {
 813   VisitRedeclarable(D);
 814   VisitNamedDecl(D);
 815   Record.push_back(D->isInline());
 816   Writer.AddSourceLocation(D->getLocStart(), Record);
 817   Writer.AddSourceLocation(D->getRBraceLoc(), Record);
 818
 819   if (D->isOriginalNamespace())
 820     Writer.AddDeclRef(D->getAnonymousNamespace(), Record);
 821   Code = serialization::DECL_NAMESPACE;
 822
 823   if (Writer.hasChain() && !D->isOriginalNamespace() &&
 824       D->getOriginalNamespace()->isFromASTFile()) {
 825     NamespaceDecl *NS = D->getOriginalNamespace();
 826     Writer.AddUpdatedDeclContext(NS);
 827
 828     // Make sure all visible decls are written. They will be recorded later.
 829     if (StoredDeclsMap *Map = NS->buildLookup()) {
 830       for (StoredDeclsMap::iterator D = Map->begin(), DEnd = Map->end();
 831            D != DEnd; ++D) {
 832         DeclContext::lookup_result Result = D->second.getLookupResult();
 833         while (Result.first != Result.second) {
 834           Writer.GetDeclRef(*Result.first);
 835           ++Result.first;
 836         }
 837       }
 838     }
 839   }
 840
 841   if (Writer.hasChain() && D->isAnonymousNamespace() &&
 842       D == D->getMostRecentDecl()) {
 843     // This is a most recent reopening of the anonymous namespace. If its parent
 844     // is in a previous PCH (or is the TU), mark that parent for update, because
 845     // the original namespace always points to the latest re-opening of its
 846     // anonymous namespace.
 847     Decl *Parent = cast<Decl>(
 848         D->getParent()->getRedeclContext()->getPrimaryContext());
 849     if (Parent->isFromASTFile() || isa<TranslationUnitDecl>(Parent)) {
 850       ASTWriter::UpdateRecord &Record = Writer.DeclUpdates[Parent];
 851       Record.push_back(UPD_CXX_ADDED_ANONYMOUS_NAMESPACE);
 852       Writer.AddDeclRef(D, Record);
 853     }
 854   }
 855 }
 856
 857 void ASTDeclWriter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
 858   VisitNamedDecl(D);
 859   Writer.AddSourceLocation(D->getNamespaceLoc(), Record);
 860   Writer.AddSourceLocation(D->getTargetNameLoc(), Record);
 861   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
 862   Writer.AddDeclRef(D->getNamespace(), Record);
 863   Code = serialization::DECL_NAMESPACE_ALIAS;
 864 }
 865
 866 void ASTDeclWriter::VisitUsingDecl(UsingDecl *D) {
 867   VisitNamedDecl(D);
 868   Writer.AddSourceLocation(D->getUsingLocation(), Record);
 869   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
 870   Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
 871   Writer.AddDeclRef(D->FirstUsingShadow.getPointer(), Record);
 872   Record.push_back(D->isTypeName());
 873   Writer.AddDeclRef(Context.getInstantiatedFromUsingDecl(D), Record);
 874   Code = serialization::DECL_USING;
 875 }
 876
 877 void ASTDeclWriter::VisitUsingShadowDecl(UsingShadowDecl *D) {
 878   VisitNamedDecl(D);
 879   Writer.AddDeclRef(D->getTargetDecl(), Record);
 880   Writer.AddDeclRef(D->UsingOrNextShadow, Record);
 881   Writer.AddDeclRef(Context.getInstantiatedFromUsingShadowDecl(D), Record);
 882   Code = serialization::DECL_USING_SHADOW;
 883 }
 884
 885 void ASTDeclWriter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
 886   VisitNamedDecl(D);
 887   Writer.AddSourceLocation(D->getUsingLoc(), Record);
 888   Writer.AddSourceLocation(D->getNamespaceKeyLocation(), Record);
 889   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
 890   Writer.AddDeclRef(D->getNominatedNamespace(), Record);
 891   Writer.AddDeclRef(dyn_cast<Decl>(D->getCommonAncestor()), Record);
 892   Code = serialization::DECL_USING_DIRECTIVE;
 893 }
 894
 895 void ASTDeclWriter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
 896   VisitValueDecl(D);
 897   Writer.AddSourceLocation(D->getUsingLoc(), Record);
 898   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
 899   Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
 900   Code = serialization::DECL_UNRESOLVED_USING_VALUE;
 901 }
 902
 903 void ASTDeclWriter::VisitUnresolvedUsingTypenameDecl(
 904                                                UnresolvedUsingTypenameDecl *D) {
 905   VisitTypeDecl(D);
 906   Writer.AddSourceLocation(D->getTypenameLoc(), Record);
 907   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
 908   Code = serialization::DECL_UNRESOLVED_USING_TYPENAME;
 909 }
 910
 911 void ASTDeclWriter::VisitCXXRecordDecl(CXXRecordDecl *D) {
 912   VisitRecordDecl(D);
 913   Record.push_back(D->isThisDeclarationADefinition());
 914   if (D->isThisDeclarationADefinition())
 915     Writer.AddCXXDefinitionData(D, Record);
 916
 917   enum {
 918     CXXRecNotTemplate = 0, CXXRecTemplate, CXXRecMemberSpecialization
 919   };
 920   if (ClassTemplateDecl *TemplD = D->getDescribedClassTemplate()) {
 921     Record.push_back(CXXRecTemplate);
 922     Writer.AddDeclRef(TemplD, Record);
 923   } else if (MemberSpecializationInfo *MSInfo
 924                = D->getMemberSpecializationInfo()) {
 925     Record.push_back(CXXRecMemberSpecialization);
 926     Writer.AddDeclRef(MSInfo->getInstantiatedFrom(), Record);
 927     Record.push_back(MSInfo->getTemplateSpecializationKind());
 928     Writer.AddSourceLocation(MSInfo->getPointOfInstantiation(), Record);
 929   } else {
 930     Record.push_back(CXXRecNotTemplate);
 931   }
 932
 933   // Store the key function to avoid deserializing every method so we can
 934   // compute it.
 935   if (D->IsCompleteDefinition)
 936     Writer.AddDeclRef(Context.getKeyFunction(D), Record);
 937
 938   Code = serialization::DECL_CXX_RECORD;
 939 }
 940
 941 void ASTDeclWriter::VisitCXXMethodDecl(CXXMethodDecl *D) {
 942   VisitFunctionDecl(D);
 943   Record.push_back(D->size_overridden_methods());
 944   for (CXXMethodDecl::method_iterator
 945          I = D->begin_overridden_methods(), E = D->end_overridden_methods();
 946          I != E; ++I)
 947     Writer.AddDeclRef(*I, Record);
 948   Code = serialization::DECL_CXX_METHOD;
 949 }
 950
 951 void ASTDeclWriter::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
 952   VisitCXXMethodDecl(D);
 953
 954   Record.push_back(D->IsExplicitSpecified);
 955   Record.push_back(D->ImplicitlyDefined);
 956   Writer.AddCXXCtorInitializers(D->CtorInitializers, D->NumCtorInitializers,
 957                                 Record);
 958
 959   Code = serialization::DECL_CXX_CONSTRUCTOR;
 960 }
 961
 962 void ASTDeclWriter::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
 963   VisitCXXMethodDecl(D);
 964
 965   Record.push_back(D->ImplicitlyDefined);
 966   Writer.AddDeclRef(D->OperatorDelete, Record);
 967
 968   Code = serialization::DECL_CXX_DESTRUCTOR;
 969 }
 970
 971 void ASTDeclWriter::VisitCXXConversionDecl(CXXConversionDecl *D) {
 972   VisitCXXMethodDecl(D);
 973   Record.push_back(D->IsExplicitSpecified);
 974   Code = serialization::DECL_CXX_CONVERSION;
 975 }
 976
 977 void ASTDeclWriter::VisitImportDecl(ImportDecl *D) {
 978   VisitDecl(D);
 979   ArrayRef<SourceLocation> IdentifierLocs = D->getIdentifierLocs();
 980   Record.push_back(!IdentifierLocs.empty());
 981   if (IdentifierLocs.empty()) {
 982     Writer.AddSourceLocation(D->getLocEnd(), Record);
 983     Record.push_back(1);
 984   } else {
 985     for (unsigned I = 0, N = IdentifierLocs.size(); I != N; ++I)
 986       Writer.AddSourceLocation(IdentifierLocs[I], Record);
 987     Record.push_back(IdentifierLocs.size());
 988   }
 989   // Note: the number of source locations must always be the last element in
 990   // the record.
 991   Code = serialization::DECL_IMPORT;
 992 }
 993
 994 void ASTDeclWriter::VisitAccessSpecDecl(AccessSpecDecl *D) {
 995   VisitDecl(D);
 996   Writer.AddSourceLocation(D->getColonLoc(), Record);
 997   Code = serialization::DECL_ACCESS_SPEC;
 998 }
 999
1000 void ASTDeclWriter::VisitFriendDecl(FriendDecl *D) {
1001   VisitDecl(D);
1002   Record.push_back(D->Friend.is<TypeSourceInfo*>());
1003   if (D->Friend.is<TypeSourceInfo*>())
1004     Writer.AddTypeSourceInfo(D->Friend.get<TypeSourceInfo*>(), Record);
1005   else
1006     Writer.AddDeclRef(D->Friend.get<NamedDecl*>(), Record);
1007   Writer.AddDeclRef(D->getNextFriend(), Record);
1008   Record.push_back(D->UnsupportedFriend);
1009   Writer.AddSourceLocation(D->FriendLoc, Record);
1010   Code = serialization::DECL_FRIEND;
1011 }
1012
1013 void ASTDeclWriter::VisitFriendTemplateDecl(FriendTemplateDecl *D) {
1014   VisitDecl(D);
1015   Record.push_back(D->getNumTemplateParameters());
1016   for (unsigned i = 0, e = D->getNumTemplateParameters(); i != e; ++i)
1017     Writer.AddTemplateParameterList(D->getTemplateParameterList(i), Record);
1018   Record.push_back(D->getFriendDecl() != 0);
1019   if (D->getFriendDecl())
1020     Writer.AddDeclRef(D->getFriendDecl(), Record);
1021   else
1022     Writer.AddTypeSourceInfo(D->getFriendType(), Record);
1023   Writer.AddSourceLocation(D->getFriendLoc(), Record);
1024   Code = serialization::DECL_FRIEND_TEMPLATE;
1025 }
1026
1027 void ASTDeclWriter::VisitTemplateDecl(TemplateDecl *D) {
1028   VisitNamedDecl(D);
1029
1030   Writer.AddDeclRef(D->getTemplatedDecl(), Record);
1031   Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1032 }
1033
1034 void ASTDeclWriter::VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D) {
1035   VisitRedeclarable(D);
1036
1037   // Emit data to initialize CommonOrPrev before VisitTemplateDecl so that
1038   // getCommonPtr() can be used while this is still initializing.
1039   if (D->isFirstDeclaration()) {
1040     // This declaration owns the 'common' pointer, so serialize that data now.
1041     Writer.AddDeclRef(D->getInstantiatedFromMemberTemplate(), Record);
1042     if (D->getInstantiatedFromMemberTemplate())
1043       Record.push_back(D->isMemberSpecialization());
1044   }
1045
1046   VisitTemplateDecl(D);
1047   Record.push_back(D->getIdentifierNamespace());
1048 }
1049
1050 void ASTDeclWriter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1051   VisitRedeclarableTemplateDecl(D);
1052
1053   if (D->isFirstDeclaration()) {
1054     typedef llvm::FoldingSet<ClassTemplateSpecializationDecl> CTSDSetTy;
1055     CTSDSetTy &CTSDSet = D->getSpecializations();
1056     Record.push_back(CTSDSet.size());
1057     for (CTSDSetTy::iterator I=CTSDSet.begin(), E = CTSDSet.end(); I!=E; ++I) {
1058       assert(I->isCanonicalDecl() && "Expected only canonical decls in set");
1059       Writer.AddDeclRef(&*I, Record);
1060     }
1061
1062     typedef llvm::FoldingSet<ClassTemplatePartialSpecializationDecl> CTPSDSetTy;
1063     CTPSDSetTy &CTPSDSet = D->getPartialSpecializations();
1064     Record.push_back(CTPSDSet.size());
1065     for (CTPSDSetTy::iterator I=CTPSDSet.begin(), E=CTPSDSet.end(); I!=E; ++I) {
1066       assert(I->isCanonicalDecl() && "Expected only canonical decls in set");
1067       Writer.AddDeclRef(&*I, Record);
1068     }
1069
1070     // InjectedClassNameType is computed, no need to write it.
1071   }
1072   Code = serialization::DECL_CLASS_TEMPLATE;
1073 }
1074
1075 void ASTDeclWriter::VisitClassTemplateSpecializationDecl(
1076                                            ClassTemplateSpecializationDecl *D) {
1077   VisitCXXRecordDecl(D);
1078
1079   llvm::PointerUnion<ClassTemplateDecl *,
1080                      ClassTemplatePartialSpecializationDecl *> InstFrom
1081     = D->getSpecializedTemplateOrPartial();
1082   if (Decl *InstFromD = InstFrom.dyn_cast<ClassTemplateDecl *>()) {
1083     Writer.AddDeclRef(InstFromD, Record);
1084   } else {
1085     Writer.AddDeclRef(InstFrom.get<ClassTemplatePartialSpecializationDecl *>(),
1086                       Record);
1087     Writer.AddTemplateArgumentList(&D->getTemplateInstantiationArgs(), Record);
1088   }
1089
1090   // Explicit info.
1091   Writer.AddTypeSourceInfo(D->getTypeAsWritten(), Record);
1092   if (D->getTypeAsWritten()) {
1093     Writer.AddSourceLocation(D->getExternLoc(), Record);
1094     Writer.AddSourceLocation(D->getTemplateKeywordLoc(), Record);
1095   }
1096
1097   Writer.AddTemplateArgumentList(&D->getTemplateArgs(), Record);
1098   Writer.AddSourceLocation(D->getPointOfInstantiation(), Record);
1099   Record.push_back(D->getSpecializationKind());
1100
1101   if (D->isCanonicalDecl()) {
1102     // When reading, we'll add it to the folding set of the following template.
1103     Writer.AddDeclRef(D->getSpecializedTemplate()->getCanonicalDecl(), Record);
1104   }
1105
1106   Code = serialization::DECL_CLASS_TEMPLATE_SPECIALIZATION;
1107 }
1108
1109 void ASTDeclWriter::VisitClassTemplatePartialSpecializationDecl(
1110                                     ClassTemplatePartialSpecializationDecl *D) {
1111   VisitClassTemplateSpecializationDecl(D);
1112
1113   Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1114
1115   Record.push_back(D->getNumTemplateArgsAsWritten());
1116   for (int i = 0, e = D->getNumTemplateArgsAsWritten(); i != e; ++i)
1117     Writer.AddTemplateArgumentLoc(D->getTemplateArgsAsWritten()[i], Record);
1118
1119   Record.push_back(D->getSequenceNumber());
1120
1121   // These are read/set from/to the first declaration.
1122   if (D->getPreviousDecl() == 0) {
1123     Writer.AddDeclRef(D->getInstantiatedFromMember(), Record);
1124     Record.push_back(D->isMemberSpecialization());
1125   }
1126
1127   Code = serialization::DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION;
1128 }
1129
1130 void ASTDeclWriter::VisitClassScopeFunctionSpecializationDecl(
1131                                     ClassScopeFunctionSpecializationDecl *D) {
1132   VisitDecl(D);
1133   Writer.AddDeclRef(D->getSpecialization(), Record);
1134   Code = serialization::DECL_CLASS_SCOPE_FUNCTION_SPECIALIZATION;
1135 }
1136
1137
1138 void ASTDeclWriter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1139   VisitRedeclarableTemplateDecl(D);
1140
1141   if (D->isFirstDeclaration()) {
1142     // This FunctionTemplateDecl owns the CommonPtr; write it.
1143
1144     // Write the function specialization declarations.
1145     Record.push_back(D->getSpecializations().size());
1146     for (llvm::FoldingSet<FunctionTemplateSpecializationInfo>::iterator
1147            I = D->getSpecializations().begin(),
1148            E = D->getSpecializations().end()   ; I != E; ++I) {
1149       assert(I->Function->isCanonicalDecl() &&
1150              "Expected only canonical decls in set");
1151       Writer.AddDeclRef(I->Function, Record);
1152     }
1153   }
1154   Code = serialization::DECL_FUNCTION_TEMPLATE;
1155 }
1156
1157 void ASTDeclWriter::VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D) {
1158   VisitTypeDecl(D);
1159
1160   Record.push_back(D->wasDeclaredWithTypename());
1161   Record.push_back(D->defaultArgumentWasInherited());
1162   Writer.AddTypeSourceInfo(D->getDefaultArgumentInfo(), Record);
1163
1164   Code = serialization::DECL_TEMPLATE_TYPE_PARM;
1165 }
1166
1167 void ASTDeclWriter::VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {
1168   // For an expanded parameter pack, record the number of expansion types here
1169   // so that it's easier for
1170   if (D->isExpandedParameterPack())
1171     Record.push_back(D->getNumExpansionTypes());
1172
1173   VisitDeclaratorDecl(D);
1174   // TemplateParmPosition.
1175   Record.push_back(D->getDepth());
1176   Record.push_back(D->getPosition());
1177
1178   if (D->isExpandedParameterPack()) {
1179     for (unsigned I = 0, N = D->getNumExpansionTypes(); I != N; ++I) {
1180       Writer.AddTypeRef(D->getExpansionType(I), Record);
1181       Writer.AddTypeSourceInfo(D->getExpansionTypeSourceInfo(I), Record);
1182     }
1183
1184     Code = serialization::DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK;
1185   } else {
1186     // Rest of NonTypeTemplateParmDecl.
1187     Record.push_back(D->isParameterPack());
1188     Record.push_back(D->getDefaultArgument() != 0);
1189     if (D->getDefaultArgument()) {
1190       Writer.AddStmt(D->getDefaultArgument());
1191       Record.push_back(D->defaultArgumentWasInherited());
1192     }
1193     Code = serialization::DECL_NON_TYPE_TEMPLATE_PARM;
1194   }
1195 }
1196
1197 void ASTDeclWriter::VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D) {
1198   VisitTemplateDecl(D);
1199   // TemplateParmPosition.
1200   Record.push_back(D->getDepth());
1201   Record.push_back(D->getPosition());
1202   // Rest of TemplateTemplateParmDecl.
1203   Writer.AddTemplateArgumentLoc(D->getDefaultArgument(), Record);
1204   Record.push_back(D->defaultArgumentWasInherited());
1205   Record.push_back(D->isParameterPack());
1206   Code = serialization::DECL_TEMPLATE_TEMPLATE_PARM;
1207 }
1208
1209 void ASTDeclWriter::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) {
1210   VisitRedeclarableTemplateDecl(D);
1211   Code = serialization::DECL_TYPE_ALIAS_TEMPLATE;
1212 }
1213
1214 void ASTDeclWriter::VisitStaticAssertDecl(StaticAssertDecl *D) {
1215   VisitDecl(D);
1216   Writer.AddStmt(D->getAssertExpr());
1217   Writer.AddStmt(D->getMessage());
1218   Writer.AddSourceLocation(D->getRParenLoc(), Record);
1219   Code = serialization::DECL_STATIC_ASSERT;
1220 }
1221
1222 /// \brief Emit the DeclContext part of a declaration context decl.
1223 ///
1224 /// \param LexicalOffset the offset at which the DECL_CONTEXT_LEXICAL
1225 /// block for this declaration context is stored. May be 0 to indicate
1226 /// that there are no declarations stored within this context.
1227 ///
1228 /// \param VisibleOffset the offset at which the DECL_CONTEXT_VISIBLE
1229 /// block for this declaration context is stored. May be 0 to indicate
1230 /// that there are no declarations visible from this context. Note
1231 /// that this value will not be emitted for non-primary declaration
1232 /// contexts.
1233 void ASTDeclWriter::VisitDeclContext(DeclContext *DC, uint64_t LexicalOffset,
1234                                      uint64_t VisibleOffset) {
1235   Record.push_back(LexicalOffset);
1236   Record.push_back(VisibleOffset);
1237 }
1238
1239 template <typename T>
1240 void ASTDeclWriter::VisitRedeclarable(Redeclarable<T> *D) {
1241   T *First = D->getFirstDeclaration();
1242   if (First->getMostRecentDecl() != First) {
1243     // There is more than one declaration of this entity, so we will need to
1244     // write a redeclaration chain.
1245     Writer.AddDeclRef(First, Record);
1246     Writer.Redeclarations.insert(First);
1247
1248     // Make sure that we serialize both the previous and the most-recent
1249     // declarations, which (transitively) ensures that all declarations in the
1250     // chain get serialized.
1251     (void)Writer.GetDeclRef(D->getPreviousDecl());
1252     (void)Writer.GetDeclRef(First->getMostRecentDecl());
1253   } else {
1254     // We use the sentinel value 0 to indicate an only declaration.
1255     Record.push_back(0);
1256   }
1257
1258 }
1259
1260 //===----------------------------------------------------------------------===//
1261 // ASTWriter Implementation
1262 //===----------------------------------------------------------------------===//
1263
1264 void ASTWriter::WriteDeclsBlockAbbrevs() {
1265   using namespace llvm;
1266
1267   BitCodeAbbrev *Abv;
1268
1269   // Abbreviation for DECL_FIELD
1270   Abv = new BitCodeAbbrev();
1271   Abv->Add(BitCodeAbbrevOp(serialization::DECL_FIELD));
1272   // Decl
1273   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1274   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1275   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1276   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1277   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1278   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1279   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1280   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1281   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1282   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1283   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1284   // NamedDecl
1285   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1286   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1287   // ValueDecl
1288   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1289   // DeclaratorDecl
1290   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1291   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1292   // FieldDecl
1293   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1294   Abv->Add(BitCodeAbbrevOp(0));                       //getBitWidth
1295   // Type Source Info
1296   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1297   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1298   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1299   DeclFieldAbbrev = Stream.EmitAbbrev(Abv);
1300
1301   // Abbreviation for DECL_OBJC_IVAR
1302   Abv = new BitCodeAbbrev();
1303   Abv->Add(BitCodeAbbrevOp(serialization::DECL_OBJC_IVAR));
1304   // Decl
1305   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1306   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1307   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1308   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1309   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1310   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1311   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1312   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1313   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1314   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1315   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1316   // NamedDecl
1317   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1318   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1319   // ValueDecl
1320   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1321   // DeclaratorDecl
1322   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1323   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1324   // FieldDecl
1325   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1326   Abv->Add(BitCodeAbbrevOp(0));                       //getBitWidth
1327   // ObjC Ivar
1328   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getAccessControl
1329   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getSynthesize
1330   // Type Source Info
1331   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1332   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1333   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1334   DeclObjCIvarAbbrev = Stream.EmitAbbrev(Abv);
1335
1336   // Abbreviation for DECL_ENUM
1337   Abv = new BitCodeAbbrev();
1338   Abv->Add(BitCodeAbbrevOp(serialization::DECL_ENUM));
1339   // Redeclarable
1340   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1341   // Decl
1342   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1343   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1344   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1345   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1346   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1347   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1348   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1349   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1350   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1351   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1352   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1353   // NamedDecl
1354   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1355   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1356   // TypeDecl
1357   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1358   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1359   // TagDecl
1360   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1361   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1362   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1363   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1364   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1365   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1366   Abv->Add(BitCodeAbbrevOp(0));                         // hasExtInfo
1367   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // TypedefNameAnonDecl
1368   // EnumDecl
1369   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // AddTypeRef
1370   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IntegerType
1371   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getPromotionType
1372   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumPositiveBits
1373   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumNegativeBits
1374   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScoped
1375   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScopedUsingClassTag
1376   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isFixed
1377   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // InstantiatedMembEnum
1378   // DC
1379   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1380   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1381   DeclEnumAbbrev = Stream.EmitAbbrev(Abv);
1382
1383   // Abbreviation for DECL_RECORD
1384   Abv = new BitCodeAbbrev();
1385   Abv->Add(BitCodeAbbrevOp(serialization::DECL_RECORD));
1386   // Redeclarable
1387   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1388   // Decl
1389   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1390   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1391   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1392   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1393   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1394   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1395   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1396   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1397   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1398   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1399   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1400   // NamedDecl
1401   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1402   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1403   // TypeDecl
1404   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1405   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1406   // TagDecl
1407   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1408   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1409   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1410   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1411   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1412   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1413   Abv->Add(BitCodeAbbrevOp(0));                         // hasExtInfo
1414   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // TypedefNameAnonDecl
1415   // RecordDecl
1416   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // FlexibleArrayMember
1417   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // AnonymousStructUnion
1418   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasObjectMember
1419   // DC
1420   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1421   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1422   DeclRecordAbbrev = Stream.EmitAbbrev(Abv);
1423
1424   // Abbreviation for DECL_PARM_VAR
1425   Abv = new BitCodeAbbrev();
1426   Abv->Add(BitCodeAbbrevOp(serialization::DECL_PARM_VAR));
1427   // Redeclarable
1428   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1429   // Decl
1430   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1431   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1432   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1433   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1434   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1435   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1436   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1437   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1438   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1439   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1440   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1441   // NamedDecl
1442   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1443   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1444   // ValueDecl
1445   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1446   // DeclaratorDecl
1447   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1448   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1449   // VarDecl
1450   Abv->Add(BitCodeAbbrevOp(0));                       // StorageClass
1451   Abv->Add(BitCodeAbbrevOp(0));                       // StorageClassAsWritten
1452   Abv->Add(BitCodeAbbrevOp(0));                       // isThreadSpecified
1453   Abv->Add(BitCodeAbbrevOp(0));                       // hasCXXDirectInitializer
1454   Abv->Add(BitCodeAbbrevOp(0));                       // isExceptionVariable
1455   Abv->Add(BitCodeAbbrevOp(0));                       // isNRVOVariable
1456   Abv->Add(BitCodeAbbrevOp(0));                       // isCXXForRangeDecl
1457   Abv->Add(BitCodeAbbrevOp(0));                       // isARCPseudoStrong
1458   Abv->Add(BitCodeAbbrevOp(0));                       // HasInit
1459   Abv->Add(BitCodeAbbrevOp(0));                   // HasMemberSpecializationInfo
1460   // ParmVarDecl
1461   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsObjCMethodParameter
1462   Abv->Add(BitCodeAbbrevOp(0));                       // ScopeDepth
1463   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ScopeIndex
1464   Abv->Add(BitCodeAbbrevOp(0));                       // ObjCDeclQualifier
1465   Abv->Add(BitCodeAbbrevOp(0));                       // KNRPromoted
1466   Abv->Add(BitCodeAbbrevOp(0));                       // HasInheritedDefaultArg
1467   Abv->Add(BitCodeAbbrevOp(0));                   // HasUninstantiatedDefaultArg
1468   // Type Source Info
1469   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1470   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1471   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1472   DeclParmVarAbbrev = Stream.EmitAbbrev(Abv);
1473
1474   // Abbreviation for DECL_TYPEDEF
1475   Abv = new BitCodeAbbrev();
1476   Abv->Add(BitCodeAbbrevOp(serialization::DECL_TYPEDEF));
1477   // Redeclarable
1478   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1479   // Decl
1480   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1481   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1482   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1483   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1484   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1485   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1486   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1487   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1488   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1489   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1490   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1491   // NamedDecl
1492   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1493   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1494   // TypeDecl
1495   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1496   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1497   // TypedefDecl
1498   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1499   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1500   DeclTypedefAbbrev = Stream.EmitAbbrev(Abv);
1501
1502   // Abbreviation for DECL_VAR
1503   Abv = new BitCodeAbbrev();
1504   Abv->Add(BitCodeAbbrevOp(serialization::DECL_VAR));
1505   // Redeclarable
1506   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1507   // Decl
1508   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1509   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1510   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1511   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1512   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1513   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1514   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1515   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1516   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1517   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1518   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1519   // NamedDecl
1520   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1521   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1522   // ValueDecl
1523   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1524   // DeclaratorDecl
1525   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1526   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1527   // VarDecl
1528   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // StorageClass
1529   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // StorageClassAsWritten
1530   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isThreadSpecified
1531   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // CXXDirectInitializer
1532   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isExceptionVariable
1533   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isNRVOVariable
1534   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCXXForRangeDecl
1535   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isARCPseudoStrong
1536   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // HasInit
1537   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // HasMemberSpecInfo
1538   // Type Source Info
1539   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1540   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1541   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1542   DeclVarAbbrev = Stream.EmitAbbrev(Abv);
1543
1544   // Abbreviation for EXPR_DECL_REF
1545   Abv = new BitCodeAbbrev();
1546   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_DECL_REF));
1547   //Stmt
1548   //Expr
1549   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1550   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
1551   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
1552   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
1553   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
1554   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
1555   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
1556   //DeclRefExpr
1557   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HasQualifier
1558   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //GetDeclFound
1559   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ExplicitTemplateArgs
1560   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HadMultipleCandidates
1561   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //RefersToEnclosingLocal
1562   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclRef
1563   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1564   DeclRefExprAbbrev = Stream.EmitAbbrev(Abv);
1565
1566   // Abbreviation for EXPR_INTEGER_LITERAL
1567   Abv = new BitCodeAbbrev();
1568   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_INTEGER_LITERAL));
1569   //Stmt
1570   //Expr
1571   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1572   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
1573   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
1574   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
1575   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
1576   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
1577   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
1578   //Integer Literal
1579   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1580   Abv->Add(BitCodeAbbrevOp(32));                      // Bit Width
1581   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Value
1582   IntegerLiteralAbbrev = Stream.EmitAbbrev(Abv);
1583
1584   // Abbreviation for EXPR_CHARACTER_LITERAL
1585   Abv = new BitCodeAbbrev();
1586   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_CHARACTER_LITERAL));
1587   //Stmt
1588   //Expr
1589   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1590   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
1591   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
1592   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
1593   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
1594   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
1595   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
1596   //Character Literal
1597   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getValue
1598   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1599   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //IsWide
1600   CharacterLiteralAbbrev = Stream.EmitAbbrev(Abv);
1601
1602   Abv = new BitCodeAbbrev();
1603   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_LEXICAL));
1604   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1605   DeclContextLexicalAbbrev = Stream.EmitAbbrev(Abv);
1606
1607   Abv = new BitCodeAbbrev();
1608   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_VISIBLE));
1609   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1610   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1611   DeclContextVisibleLookupAbbrev = Stream.EmitAbbrev(Abv);
1612 }
1613
1614 /// isRequiredDecl - Check if this is a "required" Decl, which must be seen by
1615 /// consumers of the AST.
1616 ///
1617 /// Such decls will always be deserialized from the AST file, so we would like
1618 /// this to be as restrictive as possible. Currently the predicate is driven by
1619 /// code generation requirements, if other clients have a different notion of
1620 /// what is "required" then we may have to consider an alternate scheme where
1621 /// clients can iterate over the top-level decls and get information on them,
1622 /// without necessary deserializing them. We could explicitly require such
1623 /// clients to use a separate API call to "realize" the decl. This should be
1624 /// relatively painless since they would presumably only do it for top-level
1625 /// decls.
1626 static bool isRequiredDecl(const Decl *D, ASTContext &Context) {
1627   // An ObjCMethodDecl is never considered as "required" because its
1628   // implementation container always is.
1629
1630   // File scoped assembly or obj-c implementation must be seen.
1631   if (isa<FileScopeAsmDecl>(D) || isa<ObjCImplDecl>(D))
1632     return true;
1633
1634   return Context.DeclMustBeEmitted(D);
1635 }
1636
1637 void ASTWriter::WriteDecl(ASTContext &Context, Decl *D) {
1638   // Switch case IDs are per Decl.
1639   ClearSwitchCaseIDs();
1640
1641   RecordData Record;
1642   ASTDeclWriter W(*this, Context, Record);
1643
1644   // Determine the ID for this declaration.
1645   serialization::DeclID ID;
1646   if (D->isFromASTFile())
1647     ID = getDeclID(D);
1648   else {
1649     serialization::DeclID &IDR = DeclIDs[D];
1650     if (IDR == 0)
1651       IDR = NextDeclID++;
1652
1653     ID= IDR;
1654   }
1655
1656   bool isReplacingADecl = ID < FirstDeclID;
1657
1658   // If this declaration is also a DeclContext, write blocks for the
1659   // declarations that lexically stored inside its context and those
1660   // declarations that are visible from its context. These blocks
1661   // are written before the declaration itself so that we can put
1662   // their offsets into the record for the declaration.
1663   uint64_t LexicalOffset = 0;
1664   uint64_t VisibleOffset = 0;
1665   DeclContext *DC = dyn_cast<DeclContext>(D);
1666   if (DC) {
1667     if (isReplacingADecl) {
1668       // It is replacing a decl from a chained PCH; make sure that the
1669       // DeclContext is fully loaded.
1670       if (DC->hasExternalLexicalStorage())
1671         DC->LoadLexicalDeclsFromExternalStorage();
1672       if (DC->hasExternalVisibleStorage())
1673         Chain->completeVisibleDeclsMap(DC);
1674     }
1675     LexicalOffset = WriteDeclContextLexicalBlock(Context, DC);
1676     VisibleOffset = WriteDeclContextVisibleBlock(Context, DC);
1677   }
1678
1679   if (isReplacingADecl) {
1680     // We're replacing a decl in a previous file.
1681     ReplacedDecls.push_back(ReplacedDeclInfo(ID, Stream.GetCurrentBitNo(),
1682                                              D->getLocation()));
1683   } else {
1684     unsigned Index = ID - FirstDeclID;
1685
1686     // Record the offset for this declaration
1687     SourceLocation Loc = D->getLocation();
1688     if (DeclOffsets.size() == Index)
1689       DeclOffsets.push_back(DeclOffset(Loc, Stream.GetCurrentBitNo()));
1690     else if (DeclOffsets.size() < Index) {
1691       DeclOffsets.resize(Index+1);
1692       DeclOffsets[Index].setLocation(Loc);
1693       DeclOffsets[Index].BitOffset = Stream.GetCurrentBitNo();
1694     }
1695
1696     SourceManager &SM = Context.getSourceManager();
1697     if (Loc.isValid() && SM.isLocalSourceLocation(Loc))
1698       associateDeclWithFile(D, ID);
1699   }
1700
1701   // Build and emit a record for this declaration
1702   Record.clear();
1703   W.Code = (serialization::DeclCode)0;
1704   W.AbbrevToUse = 0;
1705   W.Visit(D);
1706   if (DC) W.VisitDeclContext(DC, LexicalOffset, VisibleOffset);
1707
1708   if (!W.Code)
1709     llvm::report_fatal_error(StringRef("unexpected declaration kind '") +
1710                             D->getDeclKindName() + "'");
1711   Stream.EmitRecord(W.Code, Record, W.AbbrevToUse);
1712
1713   // Flush any expressions that were written as part of this declaration.
1714   FlushStmts();
1715
1716   // Flush C++ base specifiers, if there are any.
1717   FlushCXXBaseSpecifiers();
1718
1719   // Note "external" declarations so that we can add them to a record in the
1720   // AST file later.
1721   //
1722   // FIXME: This should be renamed, the predicate is much more complicated.
1723   if (isRequiredDecl(D, Context))
1724     ExternalDefinitions.push_back(ID);
1725 }