contrib/llvm/tools/clang/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 "ASTCommon.h"
  16 #include "clang/AST/DeclCXX.h"
  17 #include "clang/AST/DeclContextInternals.h"
  18 #include "clang/AST/DeclTemplate.h"
  19 #include "clang/AST/DeclVisitor.h"
  20 #include "clang/AST/Expr.h"
  21 #include "clang/Basic/SourceManager.h"
  22 #include "clang/Serialization/ASTReader.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 VisitMSPropertyDecl(MSPropertyDecl *D);
  85     void VisitIndirectFieldDecl(IndirectFieldDecl *D);
  86     void VisitVarDecl(VarDecl *D);
  87     void VisitImplicitParamDecl(ImplicitParamDecl *D);
  88     void VisitParmVarDecl(ParmVarDecl *D);
  89     void VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D);
  90     void VisitTemplateDecl(TemplateDecl *D);
  91     void VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D);
  92     void VisitClassTemplateDecl(ClassTemplateDecl *D);
  93     void VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
  94     void VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D);
  95     void VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D);
  96     void VisitUsingDecl(UsingDecl *D);
  97     void VisitUsingShadowDecl(UsingShadowDecl *D);
  98     void VisitLinkageSpecDecl(LinkageSpecDecl *D);
  99     void VisitFileScopeAsmDecl(FileScopeAsmDecl *D);
 100     void VisitImportDecl(ImportDecl *D);
 101     void VisitAccessSpecDecl(AccessSpecDecl *D);
 102     void VisitFriendDecl(FriendDecl *D);
 103     void VisitFriendTemplateDecl(FriendTemplateDecl *D);
 104     void VisitStaticAssertDecl(StaticAssertDecl *D);
 105     void VisitBlockDecl(BlockDecl *D);
 106     void VisitCapturedDecl(CapturedDecl *D);
 107     void VisitEmptyDecl(EmptyDecl *D);
 108
 109     void VisitDeclContext(DeclContext *DC, uint64_t LexicalOffset,
 110                           uint64_t VisibleOffset);
 111     template <typename T> void VisitRedeclarable(Redeclarable<T> *D);
 112
 113
 114     // FIXME: Put in the same order is DeclNodes.td?
 115     void VisitObjCMethodDecl(ObjCMethodDecl *D);
 116     void VisitObjCContainerDecl(ObjCContainerDecl *D);
 117     void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
 118     void VisitObjCIvarDecl(ObjCIvarDecl *D);
 119     void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
 120     void VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D);
 121     void VisitObjCCategoryDecl(ObjCCategoryDecl *D);
 122     void VisitObjCImplDecl(ObjCImplDecl *D);
 123     void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
 124     void VisitObjCImplementationDecl(ObjCImplementationDecl *D);
 125     void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D);
 126     void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
 127     void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
 128     void VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D);
 129   };
 130 }
 131
 132 void ASTDeclWriter::Visit(Decl *D) {
 133   DeclVisitor<ASTDeclWriter>::Visit(D);
 134
 135   // Source locations require array (variable-length) abbreviations.  The
 136   // abbreviation infrastructure requires that arrays are encoded last, so
 137   // we handle it here in the case of those classes derived from DeclaratorDecl
 138   if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)){
 139     Writer.AddTypeSourceInfo(DD->getTypeSourceInfo(), Record);
 140   }
 141
 142   // Handle FunctionDecl's body here and write it after all other Stmts/Exprs
 143   // have been written. We want it last because we will not read it back when
 144   // retrieving it from the AST, we'll just lazily set the offset.
 145   if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
 146     Record.push_back(FD->doesThisDeclarationHaveABody());
 147     if (FD->doesThisDeclarationHaveABody())
 148       Writer.AddStmt(FD->getBody());
 149   }
 150 }
 151
 152 void ASTDeclWriter::VisitDecl(Decl *D) {
 153   Writer.AddDeclRef(cast_or_null<Decl>(D->getDeclContext()), Record);
 154   Writer.AddDeclRef(cast_or_null<Decl>(D->getLexicalDeclContext()), Record);
 155   Record.push_back(D->isInvalidDecl());
 156   Record.push_back(D->hasAttrs());
 157   if (D->hasAttrs())
 158     Writer.WriteAttributes(ArrayRef<const Attr*>(D->getAttrs().begin(),
 159                                                  D->getAttrs().size()), Record);
 160   Record.push_back(D->isImplicit());
 161   Record.push_back(D->isUsed(false));
 162   Record.push_back(D->isReferenced());
 163   Record.push_back(D->isTopLevelDeclInObjCContainer());
 164   Record.push_back(D->getAccess());
 165   Record.push_back(D->isModulePrivate());
 166   Record.push_back(Writer.inferSubmoduleIDFromLocation(D->getLocation()));
 167 }
 168
 169 void ASTDeclWriter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
 170   llvm_unreachable("Translation units aren't directly serialized");
 171 }
 172
 173 void ASTDeclWriter::VisitNamedDecl(NamedDecl *D) {
 174   VisitDecl(D);
 175   Writer.AddDeclarationName(D->getDeclName(), Record);
 176 }
 177
 178 void ASTDeclWriter::VisitTypeDecl(TypeDecl *D) {
 179   VisitNamedDecl(D);
 180   Writer.AddSourceLocation(D->getLocStart(), Record);
 181   Writer.AddTypeRef(QualType(D->getTypeForDecl(), 0), Record);
 182 }
 183
 184 void ASTDeclWriter::VisitTypedefNameDecl(TypedefNameDecl *D) {
 185   VisitRedeclarable(D);
 186   VisitTypeDecl(D);
 187   Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record);
 188 }
 189
 190 void ASTDeclWriter::VisitTypedefDecl(TypedefDecl *D) {
 191   VisitTypedefNameDecl(D);
 192   if (!D->hasAttrs() &&
 193       !D->isImplicit() &&
 194       !D->isUsed(false) &&
 195       D->getFirstDeclaration() == D->getMostRecentDecl() &&
 196       !D->isInvalidDecl() &&
 197       !D->isReferenced() &&
 198       !D->isTopLevelDeclInObjCContainer() &&
 199       D->getAccess() == AS_none &&
 200       !D->isModulePrivate() &&
 201       D->getDeclName().getNameKind() == DeclarationName::Identifier)
 202     AbbrevToUse = Writer.getDeclTypedefAbbrev();
 203
 204   Code = serialization::DECL_TYPEDEF;
 205 }
 206
 207 void ASTDeclWriter::VisitTypeAliasDecl(TypeAliasDecl *D) {
 208   VisitTypedefNameDecl(D);
 209   Code = serialization::DECL_TYPEALIAS;
 210 }
 211
 212 void ASTDeclWriter::VisitTagDecl(TagDecl *D) {
 213   VisitRedeclarable(D);
 214   VisitTypeDecl(D);
 215   Record.push_back(D->getIdentifierNamespace());
 216   Record.push_back((unsigned)D->getTagKind()); // FIXME: stable encoding
 217   Record.push_back(D->isCompleteDefinition());
 218   Record.push_back(D->isEmbeddedInDeclarator());
 219   Record.push_back(D->isFreeStanding());
 220   Writer.AddSourceLocation(D->getRBraceLoc(), Record);
 221   Record.push_back(D->hasExtInfo());
 222   if (D->hasExtInfo())
 223     Writer.AddQualifierInfo(*D->getExtInfo(), Record);
 224   else
 225     Writer.AddDeclRef(D->getTypedefNameForAnonDecl(), Record);
 226 }
 227
 228 void ASTDeclWriter::VisitEnumDecl(EnumDecl *D) {
 229   VisitTagDecl(D);
 230   Writer.AddTypeSourceInfo(D->getIntegerTypeSourceInfo(), Record);
 231   if (!D->getIntegerTypeSourceInfo())
 232     Writer.AddTypeRef(D->getIntegerType(), Record);
 233   Writer.AddTypeRef(D->getPromotionType(), Record);
 234   Record.push_back(D->getNumPositiveBits());
 235   Record.push_back(D->getNumNegativeBits());
 236   Record.push_back(D->isScoped());
 237   Record.push_back(D->isScopedUsingClassTag());
 238   Record.push_back(D->isFixed());
 239   if (MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo()) {
 240     Writer.AddDeclRef(MemberInfo->getInstantiatedFrom(), Record);
 241     Record.push_back(MemberInfo->getTemplateSpecializationKind());
 242     Writer.AddSourceLocation(MemberInfo->getPointOfInstantiation(), Record);
 243   } else {
 244     Writer.AddDeclRef(0, Record);
 245   }
 246
 247   if (!D->hasAttrs() &&
 248       !D->isImplicit() &&
 249       !D->isUsed(false) &&
 250       !D->hasExtInfo() &&
 251       D->getFirstDeclaration() == D->getMostRecentDecl() &&
 252       !D->isInvalidDecl() &&
 253       !D->isReferenced() &&
 254       !D->isTopLevelDeclInObjCContainer() &&
 255       D->getAccess() == AS_none &&
 256       !D->isModulePrivate() &&
 257       !CXXRecordDecl::classofKind(D->getKind()) &&
 258       !D->getIntegerTypeSourceInfo() &&
 259       !D->getMemberSpecializationInfo() &&
 260       D->getDeclName().getNameKind() == DeclarationName::Identifier)
 261     AbbrevToUse = Writer.getDeclEnumAbbrev();
 262
 263   Code = serialization::DECL_ENUM;
 264 }
 265
 266 void ASTDeclWriter::VisitRecordDecl(RecordDecl *D) {
 267   VisitTagDecl(D);
 268   Record.push_back(D->hasFlexibleArrayMember());
 269   Record.push_back(D->isAnonymousStructOrUnion());
 270   Record.push_back(D->hasObjectMember());
 271   Record.push_back(D->hasVolatileMember());
 272
 273   if (!D->hasAttrs() &&
 274       !D->isImplicit() &&
 275       !D->isUsed(false) &&
 276       !D->hasExtInfo() &&
 277       D->getFirstDeclaration() == D->getMostRecentDecl() &&
 278       !D->isInvalidDecl() &&
 279       !D->isReferenced() &&
 280       !D->isTopLevelDeclInObjCContainer() &&
 281       D->getAccess() == AS_none &&
 282       !D->isModulePrivate() &&
 283       !CXXRecordDecl::classofKind(D->getKind()) &&
 284       D->getDeclName().getNameKind() == DeclarationName::Identifier)
 285     AbbrevToUse = Writer.getDeclRecordAbbrev();
 286
 287   Code = serialization::DECL_RECORD;
 288 }
 289
 290 void ASTDeclWriter::VisitValueDecl(ValueDecl *D) {
 291   VisitNamedDecl(D);
 292   Writer.AddTypeRef(D->getType(), Record);
 293 }
 294
 295 void ASTDeclWriter::VisitEnumConstantDecl(EnumConstantDecl *D) {
 296   VisitValueDecl(D);
 297   Record.push_back(D->getInitExpr()? 1 : 0);
 298   if (D->getInitExpr())
 299     Writer.AddStmt(D->getInitExpr());
 300   Writer.AddAPSInt(D->getInitVal(), Record);
 301
 302   Code = serialization::DECL_ENUM_CONSTANT;
 303 }
 304
 305 void ASTDeclWriter::VisitDeclaratorDecl(DeclaratorDecl *D) {
 306   VisitValueDecl(D);
 307   Writer.AddSourceLocation(D->getInnerLocStart(), Record);
 308   Record.push_back(D->hasExtInfo());
 309   if (D->hasExtInfo())
 310     Writer.AddQualifierInfo(*D->getExtInfo(), Record);
 311 }
 312
 313 void ASTDeclWriter::VisitFunctionDecl(FunctionDecl *D) {
 314   VisitRedeclarable(D);
 315   VisitDeclaratorDecl(D);
 316
 317   Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
 318   Record.push_back(D->getIdentifierNamespace());
 319
 320   // FunctionDecl's body is handled last at ASTWriterDecl::Visit,
 321   // after everything else is written.
 322
 323   Record.push_back(D->getStorageClass()); // FIXME: stable encoding
 324   Record.push_back(D->IsInline);
 325   Record.push_back(D->isInlineSpecified());
 326   Record.push_back(D->isVirtualAsWritten());
 327   Record.push_back(D->isPure());
 328   Record.push_back(D->hasInheritedPrototype());
 329   Record.push_back(D->hasWrittenPrototype());
 330   Record.push_back(D->isDeletedAsWritten());
 331   Record.push_back(D->isTrivial());
 332   Record.push_back(D->isDefaulted());
 333   Record.push_back(D->isExplicitlyDefaulted());
 334   Record.push_back(D->hasImplicitReturnZero());
 335   Record.push_back(D->isConstexpr());
 336   Record.push_back(D->HasSkippedBody);
 337   Record.push_back(D->getLinkage());
 338   Writer.AddSourceLocation(D->getLocEnd(), Record);
 339
 340   Record.push_back(D->getTemplatedKind());
 341   switch (D->getTemplatedKind()) {
 342   case FunctionDecl::TK_NonTemplate:
 343     break;
 344   case FunctionDecl::TK_FunctionTemplate:
 345     Writer.AddDeclRef(D->getDescribedFunctionTemplate(), Record);
 346     break;
 347   case FunctionDecl::TK_MemberSpecialization: {
 348     MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo();
 349     Writer.AddDeclRef(MemberInfo->getInstantiatedFrom(), Record);
 350     Record.push_back(MemberInfo->getTemplateSpecializationKind());
 351     Writer.AddSourceLocation(MemberInfo->getPointOfInstantiation(), Record);
 352     break;
 353   }
 354   case FunctionDecl::TK_FunctionTemplateSpecialization: {
 355     FunctionTemplateSpecializationInfo *
 356       FTSInfo = D->getTemplateSpecializationInfo();
 357     Writer.AddDeclRef(FTSInfo->getTemplate(), Record);
 358     Record.push_back(FTSInfo->getTemplateSpecializationKind());
 359
 360     // Template arguments.
 361     Writer.AddTemplateArgumentList(FTSInfo->TemplateArguments, Record);
 362
 363     // Template args as written.
 364     Record.push_back(FTSInfo->TemplateArgumentsAsWritten != 0);
 365     if (FTSInfo->TemplateArgumentsAsWritten) {
 366       Record.push_back(FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs);
 367       for (int i=0, e = FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs;
 368              i!=e; ++i)
 369         Writer.AddTemplateArgumentLoc((*FTSInfo->TemplateArgumentsAsWritten)[i],
 370                                       Record);
 371       Writer.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->LAngleLoc,
 372                                Record);
 373       Writer.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->RAngleLoc,
 374                                Record);
 375     }
 376
 377     Writer.AddSourceLocation(FTSInfo->getPointOfInstantiation(), Record);
 378
 379     if (D->isCanonicalDecl()) {
 380       // Write the template that contains the specializations set. We will
 381       // add a FunctionTemplateSpecializationInfo to it when reading.
 382       Writer.AddDeclRef(FTSInfo->getTemplate()->getCanonicalDecl(), Record);
 383     }
 384     break;
 385   }
 386   case FunctionDecl::TK_DependentFunctionTemplateSpecialization: {
 387     DependentFunctionTemplateSpecializationInfo *
 388       DFTSInfo = D->getDependentSpecializationInfo();
 389
 390     // Templates.
 391     Record.push_back(DFTSInfo->getNumTemplates());
 392     for (int i=0, e = DFTSInfo->getNumTemplates(); i != e; ++i)
 393       Writer.AddDeclRef(DFTSInfo->getTemplate(i), Record);
 394
 395     // Templates args.
 396     Record.push_back(DFTSInfo->getNumTemplateArgs());
 397     for (int i=0, e = DFTSInfo->getNumTemplateArgs(); i != e; ++i)
 398       Writer.AddTemplateArgumentLoc(DFTSInfo->getTemplateArg(i), Record);
 399     Writer.AddSourceLocation(DFTSInfo->getLAngleLoc(), Record);
 400     Writer.AddSourceLocation(DFTSInfo->getRAngleLoc(), Record);
 401     break;
 402   }
 403   }
 404
 405   Record.push_back(D->param_size());
 406   for (FunctionDecl::param_iterator P = D->param_begin(), PEnd = D->param_end();
 407        P != PEnd; ++P)
 408     Writer.AddDeclRef(*P, Record);
 409   Code = serialization::DECL_FUNCTION;
 410 }
 411
 412 void ASTDeclWriter::VisitObjCMethodDecl(ObjCMethodDecl *D) {
 413   VisitNamedDecl(D);
 414   // FIXME: convert to LazyStmtPtr?
 415   // Unlike C/C++, method bodies will never be in header files.
 416   bool HasBodyStuff = D->getBody() != 0     ||
 417                       D->getSelfDecl() != 0 || D->getCmdDecl() != 0;
 418   Record.push_back(HasBodyStuff);
 419   if (HasBodyStuff) {
 420     Writer.AddStmt(D->getBody());
 421     Writer.AddDeclRef(D->getSelfDecl(), Record);
 422     Writer.AddDeclRef(D->getCmdDecl(), Record);
 423   }
 424   Record.push_back(D->isInstanceMethod());
 425   Record.push_back(D->isVariadic());
 426   Record.push_back(D->isPropertyAccessor());
 427   Record.push_back(D->isDefined());
 428   Record.push_back(D->IsOverriding);
 429   Record.push_back(D->HasSkippedBody);
 430
 431   Record.push_back(D->IsRedeclaration);
 432   Record.push_back(D->HasRedeclaration);
 433   if (D->HasRedeclaration) {
 434     assert(Context.getObjCMethodRedeclaration(D));
 435     Writer.AddDeclRef(Context.getObjCMethodRedeclaration(D), Record);
 436   }
 437
 438   // FIXME: stable encoding for @required/@optional
 439   Record.push_back(D->getImplementationControl());
 440   // FIXME: stable encoding for in/out/inout/bycopy/byref/oneway
 441   Record.push_back(D->getObjCDeclQualifier());
 442   Record.push_back(D->hasRelatedResultType());
 443   Writer.AddTypeRef(D->getResultType(), Record);
 444   Writer.AddTypeSourceInfo(D->getResultTypeSourceInfo(), Record);
 445   Writer.AddSourceLocation(D->getLocEnd(), Record);
 446   Record.push_back(D->param_size());
 447   for (ObjCMethodDecl::param_iterator P = D->param_begin(),
 448                                    PEnd = D->param_end(); P != PEnd; ++P)
 449     Writer.AddDeclRef(*P, Record);
 450
 451   Record.push_back(D->SelLocsKind);
 452   unsigned NumStoredSelLocs = D->getNumStoredSelLocs();
 453   SourceLocation *SelLocs = D->getStoredSelLocs();
 454   Record.push_back(NumStoredSelLocs);
 455   for (unsigned i = 0; i != NumStoredSelLocs; ++i)
 456     Writer.AddSourceLocation(SelLocs[i], Record);
 457
 458   Code = serialization::DECL_OBJC_METHOD;
 459 }
 460
 461 void ASTDeclWriter::VisitObjCContainerDecl(ObjCContainerDecl *D) {
 462   VisitNamedDecl(D);
 463   Writer.AddSourceLocation(D->getAtStartLoc(), Record);
 464   Writer.AddSourceRange(D->getAtEndRange(), Record);
 465   // Abstract class (no need to define a stable serialization::DECL code).
 466 }
 467
 468 void ASTDeclWriter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *D) {
 469   VisitRedeclarable(D);
 470   VisitObjCContainerDecl(D);
 471   Writer.AddTypeRef(QualType(D->getTypeForDecl(), 0), Record);
 472
 473   Record.push_back(D->isThisDeclarationADefinition());
 474   if (D->isThisDeclarationADefinition()) {
 475     // Write the DefinitionData
 476     ObjCInterfaceDecl::DefinitionData &Data = D->data();
 477
 478     Writer.AddDeclRef(D->getSuperClass(), Record);
 479     Writer.AddSourceLocation(D->getSuperClassLoc(), Record);
 480     Writer.AddSourceLocation(D->getEndOfDefinitionLoc(), Record);
 481
 482     // Write out the protocols that are directly referenced by the @interface.
 483     Record.push_back(Data.ReferencedProtocols.size());
 484     for (ObjCInterfaceDecl::protocol_iterator P = D->protocol_begin(),
 485                                            PEnd = D->protocol_end();
 486          P != PEnd; ++P)
 487       Writer.AddDeclRef(*P, Record);
 488     for (ObjCInterfaceDecl::protocol_loc_iterator PL = D->protocol_loc_begin(),
 489          PLEnd = D->protocol_loc_end();
 490          PL != PLEnd; ++PL)
 491       Writer.AddSourceLocation(*PL, Record);
 492
 493     // Write out the protocols that are transitively referenced.
 494     Record.push_back(Data.AllReferencedProtocols.size());
 495     for (ObjCList<ObjCProtocolDecl>::iterator
 496               P = Data.AllReferencedProtocols.begin(),
 497            PEnd = Data.AllReferencedProtocols.end();
 498          P != PEnd; ++P)
 499       Writer.AddDeclRef(*P, Record);
 500
 501
 502     if (ObjCCategoryDecl *Cat = D->getCategoryListRaw()) {
 503       // Ensure that we write out the set of categories for this class.
 504       Writer.ObjCClassesWithCategories.insert(D);
 505
 506       // Make sure that the categories get serialized.
 507       for (; Cat; Cat = Cat->getNextClassCategoryRaw())
 508         (void)Writer.GetDeclRef(Cat);
 509     }
 510   }
 511
 512   Code = serialization::DECL_OBJC_INTERFACE;
 513 }
 514
 515 void ASTDeclWriter::VisitObjCIvarDecl(ObjCIvarDecl *D) {
 516   VisitFieldDecl(D);
 517   // FIXME: stable encoding for @public/@private/@protected/@package
 518   Record.push_back(D->getAccessControl());
 519   Record.push_back(D->getSynthesize());
 520
 521   if (!D->hasAttrs() &&
 522       !D->isImplicit() &&
 523       !D->isUsed(false) &&
 524       !D->isInvalidDecl() &&
 525       !D->isReferenced() &&
 526       !D->isModulePrivate() &&
 527       !D->getBitWidth() &&
 528       !D->hasExtInfo() &&
 529       D->getDeclName())
 530     AbbrevToUse = Writer.getDeclObjCIvarAbbrev();
 531
 532   Code = serialization::DECL_OBJC_IVAR;
 533 }
 534
 535 void ASTDeclWriter::VisitObjCProtocolDecl(ObjCProtocolDecl *D) {
 536   VisitRedeclarable(D);
 537   VisitObjCContainerDecl(D);
 538
 539   Record.push_back(D->isThisDeclarationADefinition());
 540   if (D->isThisDeclarationADefinition()) {
 541     Record.push_back(D->protocol_size());
 542     for (ObjCProtocolDecl::protocol_iterator
 543          I = D->protocol_begin(), IEnd = D->protocol_end(); I != IEnd; ++I)
 544       Writer.AddDeclRef(*I, Record);
 545     for (ObjCProtocolDecl::protocol_loc_iterator PL = D->protocol_loc_begin(),
 546            PLEnd = D->protocol_loc_end();
 547          PL != PLEnd; ++PL)
 548       Writer.AddSourceLocation(*PL, Record);
 549   }
 550
 551   Code = serialization::DECL_OBJC_PROTOCOL;
 552 }
 553
 554 void ASTDeclWriter::VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D) {
 555   VisitFieldDecl(D);
 556   Code = serialization::DECL_OBJC_AT_DEFS_FIELD;
 557 }
 558
 559 void ASTDeclWriter::VisitObjCCategoryDecl(ObjCCategoryDecl *D) {
 560   VisitObjCContainerDecl(D);
 561   Writer.AddSourceLocation(D->getCategoryNameLoc(), Record);
 562   Writer.AddSourceLocation(D->getIvarLBraceLoc(), Record);
 563   Writer.AddSourceLocation(D->getIvarRBraceLoc(), Record);
 564   Writer.AddDeclRef(D->getClassInterface(), Record);
 565   Record.push_back(D->protocol_size());
 566   for (ObjCCategoryDecl::protocol_iterator
 567        I = D->protocol_begin(), IEnd = D->protocol_end(); I != IEnd; ++I)
 568     Writer.AddDeclRef(*I, Record);
 569   for (ObjCCategoryDecl::protocol_loc_iterator
 570          PL = D->protocol_loc_begin(), PLEnd = D->protocol_loc_end();
 571        PL != PLEnd; ++PL)
 572     Writer.AddSourceLocation(*PL, Record);
 573   Code = serialization::DECL_OBJC_CATEGORY;
 574 }
 575
 576 void ASTDeclWriter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D) {
 577   VisitNamedDecl(D);
 578   Writer.AddDeclRef(D->getClassInterface(), Record);
 579   Code = serialization::DECL_OBJC_COMPATIBLE_ALIAS;
 580 }
 581
 582 void ASTDeclWriter::VisitObjCPropertyDecl(ObjCPropertyDecl *D) {
 583   VisitNamedDecl(D);
 584   Writer.AddSourceLocation(D->getAtLoc(), Record);
 585   Writer.AddSourceLocation(D->getLParenLoc(), Record);
 586   Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record);
 587   // FIXME: stable encoding
 588   Record.push_back((unsigned)D->getPropertyAttributes());
 589   Record.push_back((unsigned)D->getPropertyAttributesAsWritten());
 590   // FIXME: stable encoding
 591   Record.push_back((unsigned)D->getPropertyImplementation());
 592   Writer.AddDeclarationName(D->getGetterName(), Record);
 593   Writer.AddDeclarationName(D->getSetterName(), Record);
 594   Writer.AddDeclRef(D->getGetterMethodDecl(), Record);
 595   Writer.AddDeclRef(D->getSetterMethodDecl(), Record);
 596   Writer.AddDeclRef(D->getPropertyIvarDecl(), Record);
 597   Code = serialization::DECL_OBJC_PROPERTY;
 598 }
 599
 600 void ASTDeclWriter::VisitObjCImplDecl(ObjCImplDecl *D) {
 601   VisitObjCContainerDecl(D);
 602   Writer.AddDeclRef(D->getClassInterface(), Record);
 603   // Abstract class (no need to define a stable serialization::DECL code).
 604 }
 605
 606 void ASTDeclWriter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D) {
 607   VisitObjCImplDecl(D);
 608   Writer.AddIdentifierRef(D->getIdentifier(), Record);
 609   Writer.AddSourceLocation(D->getCategoryNameLoc(), Record);
 610   Code = serialization::DECL_OBJC_CATEGORY_IMPL;
 611 }
 612
 613 void ASTDeclWriter::VisitObjCImplementationDecl(ObjCImplementationDecl *D) {
 614   VisitObjCImplDecl(D);
 615   Writer.AddDeclRef(D->getSuperClass(), Record);
 616   Writer.AddSourceLocation(D->getSuperClassLoc(), Record);
 617   Writer.AddSourceLocation(D->getIvarLBraceLoc(), Record);
 618   Writer.AddSourceLocation(D->getIvarRBraceLoc(), Record);
 619   Record.push_back(D->hasNonZeroConstructors());
 620   Record.push_back(D->hasDestructors());
 621   Writer.AddCXXCtorInitializers(D->IvarInitializers, D->NumIvarInitializers,
 622                                 Record);
 623   Code = serialization::DECL_OBJC_IMPLEMENTATION;
 624 }
 625
 626 void ASTDeclWriter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D) {
 627   VisitDecl(D);
 628   Writer.AddSourceLocation(D->getLocStart(), Record);
 629   Writer.AddDeclRef(D->getPropertyDecl(), Record);
 630   Writer.AddDeclRef(D->getPropertyIvarDecl(), Record);
 631   Writer.AddSourceLocation(D->getPropertyIvarDeclLoc(), Record);
 632   Writer.AddStmt(D->getGetterCXXConstructor());
 633   Writer.AddStmt(D->getSetterCXXAssignment());
 634   Code = serialization::DECL_OBJC_PROPERTY_IMPL;
 635 }
 636
 637 void ASTDeclWriter::VisitFieldDecl(FieldDecl *D) {
 638   VisitDeclaratorDecl(D);
 639   Record.push_back(D->isMutable());
 640   if (D->InitializerOrBitWidth.getInt() != ICIS_NoInit ||
 641       D->InitializerOrBitWidth.getPointer()) {
 642     Record.push_back(D->InitializerOrBitWidth.getInt() + 1);
 643     Writer.AddStmt(D->InitializerOrBitWidth.getPointer());
 644   } else {
 645     Record.push_back(0);
 646   }
 647   if (!D->getDeclName())
 648     Writer.AddDeclRef(Context.getInstantiatedFromUnnamedFieldDecl(D), Record);
 649
 650   if (!D->hasAttrs() &&
 651       !D->isImplicit() &&
 652       !D->isUsed(false) &&
 653       !D->isInvalidDecl() &&
 654       !D->isReferenced() &&
 655       !D->isTopLevelDeclInObjCContainer() &&
 656       !D->isModulePrivate() &&
 657       !D->getBitWidth() &&
 658       !D->hasInClassInitializer() &&
 659       !D->hasExtInfo() &&
 660       !ObjCIvarDecl::classofKind(D->getKind()) &&
 661       !ObjCAtDefsFieldDecl::classofKind(D->getKind()) &&
 662       D->getDeclName())
 663     AbbrevToUse = Writer.getDeclFieldAbbrev();
 664
 665   Code = serialization::DECL_FIELD;
 666 }
 667
 668 void ASTDeclWriter::VisitMSPropertyDecl(MSPropertyDecl *D) {
 669   VisitDeclaratorDecl(D);
 670   Writer.AddIdentifierRef(D->getGetterId(), Record);
 671   Writer.AddIdentifierRef(D->getSetterId(), Record);
 672   Code = serialization::DECL_MS_PROPERTY;
 673 }
 674
 675 void ASTDeclWriter::VisitIndirectFieldDecl(IndirectFieldDecl *D) {
 676   VisitValueDecl(D);
 677   Record.push_back(D->getChainingSize());
 678
 679   for (IndirectFieldDecl::chain_iterator
 680        P = D->chain_begin(),
 681        PEnd = D->chain_end(); P != PEnd; ++P)
 682     Writer.AddDeclRef(*P, Record);
 683   Code = serialization::DECL_INDIRECTFIELD;
 684 }
 685
 686 void ASTDeclWriter::VisitVarDecl(VarDecl *D) {
 687   VisitRedeclarable(D);
 688   VisitDeclaratorDecl(D);
 689   Record.push_back(D->getStorageClass());
 690   Record.push_back(D->getTSCSpec());
 691   Record.push_back(D->getInitStyle());
 692   Record.push_back(D->isExceptionVariable());
 693   Record.push_back(D->isNRVOVariable());
 694   Record.push_back(D->isCXXForRangeDecl());
 695   Record.push_back(D->isARCPseudoStrong());
 696   Record.push_back(D->isConstexpr());
 697   Record.push_back(D->getLinkage());
 698
 699   if (D->getInit()) {
 700     Record.push_back(!D->isInitKnownICE() ? 1 : (D->isInitICE() ? 3 : 2));
 701     Writer.AddStmt(D->getInit());
 702   } else {
 703     Record.push_back(0);
 704   }
 705
 706   MemberSpecializationInfo *SpecInfo
 707     = D->isStaticDataMember() ? D->getMemberSpecializationInfo() : 0;
 708   Record.push_back(SpecInfo != 0);
 709   if (SpecInfo) {
 710     Writer.AddDeclRef(SpecInfo->getInstantiatedFrom(), Record);
 711     Record.push_back(SpecInfo->getTemplateSpecializationKind());
 712     Writer.AddSourceLocation(SpecInfo->getPointOfInstantiation(), Record);
 713   }
 714
 715   if (!D->hasAttrs() &&
 716       !D->isImplicit() &&
 717       !D->isUsed(false) &&
 718       !D->isInvalidDecl() &&
 719       !D->isReferenced() &&
 720       !D->isTopLevelDeclInObjCContainer() &&
 721       D->getAccess() == AS_none &&
 722       !D->isModulePrivate() &&
 723       D->getDeclName().getNameKind() == DeclarationName::Identifier &&
 724       !D->hasExtInfo() &&
 725       D->getFirstDeclaration() == D->getMostRecentDecl() &&
 726       D->getInitStyle() == VarDecl::CInit &&
 727       D->getInit() == 0 &&
 728       !isa<ParmVarDecl>(D) &&
 729       !D->isConstexpr() &&
 730       !SpecInfo)
 731     AbbrevToUse = Writer.getDeclVarAbbrev();
 732
 733   Code = serialization::DECL_VAR;
 734 }
 735
 736 void ASTDeclWriter::VisitImplicitParamDecl(ImplicitParamDecl *D) {
 737   VisitVarDecl(D);
 738   Code = serialization::DECL_IMPLICIT_PARAM;
 739 }
 740
 741 void ASTDeclWriter::VisitParmVarDecl(ParmVarDecl *D) {
 742   VisitVarDecl(D);
 743   Record.push_back(D->isObjCMethodParameter());
 744   Record.push_back(D->getFunctionScopeDepth());
 745   Record.push_back(D->getFunctionScopeIndex());
 746   Record.push_back(D->getObjCDeclQualifier()); // FIXME: stable encoding
 747   Record.push_back(D->isKNRPromoted());
 748   Record.push_back(D->hasInheritedDefaultArg());
 749   Record.push_back(D->hasUninstantiatedDefaultArg());
 750   if (D->hasUninstantiatedDefaultArg())
 751     Writer.AddStmt(D->getUninstantiatedDefaultArg());
 752   Code = serialization::DECL_PARM_VAR;
 753
 754   assert(!D->isARCPseudoStrong()); // can be true of ImplicitParamDecl
 755
 756   // If the assumptions about the DECL_PARM_VAR abbrev are true, use it.  Here
 757   // we dynamically check for the properties that we optimize for, but don't
 758   // know are true of all PARM_VAR_DECLs.
 759   if (!D->hasAttrs() &&
 760       !D->hasExtInfo() &&
 761       !D->isImplicit() &&
 762       !D->isUsed(false) &&
 763       !D->isInvalidDecl() &&
 764       !D->isReferenced() &&
 765       D->getAccess() == AS_none &&
 766       !D->isModulePrivate() &&
 767       D->getStorageClass() == 0 &&
 768       D->getInitStyle() == VarDecl::CInit && // Can params have anything else?
 769       D->getFunctionScopeDepth() == 0 &&
 770       D->getObjCDeclQualifier() == 0 &&
 771       !D->isKNRPromoted() &&
 772       !D->hasInheritedDefaultArg() &&
 773       D->getInit() == 0 &&
 774       !D->hasUninstantiatedDefaultArg())  // No default expr.
 775     AbbrevToUse = Writer.getDeclParmVarAbbrev();
 776
 777   // Check things we know are true of *every* PARM_VAR_DECL, which is more than
 778   // just us assuming it.
 779   assert(!D->getTSCSpec() && "PARM_VAR_DECL can't use TLS");
 780   assert(D->getAccess() == AS_none && "PARM_VAR_DECL can't be public/private");
 781   assert(!D->isExceptionVariable() && "PARM_VAR_DECL can't be exception var");
 782   assert(D->getPreviousDecl() == 0 && "PARM_VAR_DECL can't be redecl");
 783   assert(!D->isStaticDataMember() &&
 784          "PARM_VAR_DECL can't be static data member");
 785 }
 786
 787 void ASTDeclWriter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
 788   VisitDecl(D);
 789   Writer.AddStmt(D->getAsmString());
 790   Writer.AddSourceLocation(D->getRParenLoc(), Record);
 791   Code = serialization::DECL_FILE_SCOPE_ASM;
 792 }
 793
 794 void ASTDeclWriter::VisitEmptyDecl(EmptyDecl *D) {
 795   VisitDecl(D);
 796   Code = serialization::DECL_EMPTY;
 797 }
 798
 799 void ASTDeclWriter::VisitBlockDecl(BlockDecl *D) {
 800   VisitDecl(D);
 801   Writer.AddStmt(D->getBody());
 802   Writer.AddTypeSourceInfo(D->getSignatureAsWritten(), Record);
 803   Record.push_back(D->param_size());
 804   for (FunctionDecl::param_iterator P = D->param_begin(), PEnd = D->param_end();
 805        P != PEnd; ++P)
 806     Writer.AddDeclRef(*P, Record);
 807   Record.push_back(D->isVariadic());
 808   Record.push_back(D->blockMissingReturnType());
 809   Record.push_back(D->isConversionFromLambda());
 810   Record.push_back(D->capturesCXXThis());
 811   Record.push_back(D->getNumCaptures());
 812   for (BlockDecl::capture_iterator
 813          i = D->capture_begin(), e = D->capture_end(); i != e; ++i) {
 814     const BlockDecl::Capture &capture = *i;
 815     Writer.AddDeclRef(capture.getVariable(), Record);
 816
 817     unsigned flags = 0;
 818     if (capture.isByRef()) flags |= 1;
 819     if (capture.isNested()) flags |= 2;
 820     if (capture.hasCopyExpr()) flags |= 4;
 821     Record.push_back(flags);
 822
 823     if (capture.hasCopyExpr()) Writer.AddStmt(capture.getCopyExpr());
 824   }
 825
 826   Code = serialization::DECL_BLOCK;
 827 }
 828
 829 void ASTDeclWriter::VisitCapturedDecl(CapturedDecl *CD) {
 830   Record.push_back(CD->getNumParams());
 831   VisitDecl(CD);
 832   // Body is stored by VisitCapturedStmt.
 833   for (unsigned i = 0; i < CD->getNumParams(); ++i)
 834     Writer.AddDeclRef(CD->getParam(i), Record);
 835   Code = serialization::DECL_CAPTURED;
 836 }
 837
 838 void ASTDeclWriter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
 839   VisitDecl(D);
 840   Record.push_back(D->getLanguage());
 841   Writer.AddSourceLocation(D->getExternLoc(), Record);
 842   Writer.AddSourceLocation(D->getRBraceLoc(), Record);
 843   Code = serialization::DECL_LINKAGE_SPEC;
 844 }
 845
 846 void ASTDeclWriter::VisitLabelDecl(LabelDecl *D) {
 847   VisitNamedDecl(D);
 848   Writer.AddSourceLocation(D->getLocStart(), Record);
 849   Code = serialization::DECL_LABEL;
 850 }
 851
 852
 853 void ASTDeclWriter::VisitNamespaceDecl(NamespaceDecl *D) {
 854   VisitRedeclarable(D);
 855   VisitNamedDecl(D);
 856   Record.push_back(D->isInline());
 857   Writer.AddSourceLocation(D->getLocStart(), Record);
 858   Writer.AddSourceLocation(D->getRBraceLoc(), Record);
 859
 860   if (D->isOriginalNamespace())
 861     Writer.AddDeclRef(D->getAnonymousNamespace(), Record);
 862   Code = serialization::DECL_NAMESPACE;
 863
 864   if (Writer.hasChain() && !D->isOriginalNamespace() &&
 865       D->getOriginalNamespace()->isFromASTFile()) {
 866     NamespaceDecl *NS = D->getOriginalNamespace();
 867     Writer.AddUpdatedDeclContext(NS);
 868
 869     // Make sure all visible decls are written. They will be recorded later.
 870     if (StoredDeclsMap *Map = NS->buildLookup()) {
 871       for (StoredDeclsMap::iterator D = Map->begin(), DEnd = Map->end();
 872            D != DEnd; ++D) {
 873         DeclContext::lookup_result R = D->second.getLookupResult();
 874         for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E;
 875              ++I)
 876           Writer.GetDeclRef(*I);
 877       }
 878     }
 879   }
 880
 881   if (Writer.hasChain() && D->isAnonymousNamespace() &&
 882       D == D->getMostRecentDecl()) {
 883     // This is a most recent reopening of the anonymous namespace. If its parent
 884     // is in a previous PCH (or is the TU), mark that parent for update, because
 885     // the original namespace always points to the latest re-opening of its
 886     // anonymous namespace.
 887     Decl *Parent = cast<Decl>(
 888         D->getParent()->getRedeclContext()->getPrimaryContext());
 889     if (Parent->isFromASTFile() || isa<TranslationUnitDecl>(Parent)) {
 890       ASTWriter::UpdateRecord &Record = Writer.DeclUpdates[Parent];
 891       Record.push_back(UPD_CXX_ADDED_ANONYMOUS_NAMESPACE);
 892       Writer.AddDeclRef(D, Record);
 893     }
 894   }
 895 }
 896
 897 void ASTDeclWriter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
 898   VisitNamedDecl(D);
 899   Writer.AddSourceLocation(D->getNamespaceLoc(), Record);
 900   Writer.AddSourceLocation(D->getTargetNameLoc(), Record);
 901   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
 902   Writer.AddDeclRef(D->getNamespace(), Record);
 903   Code = serialization::DECL_NAMESPACE_ALIAS;
 904 }
 905
 906 void ASTDeclWriter::VisitUsingDecl(UsingDecl *D) {
 907   VisitNamedDecl(D);
 908   Writer.AddSourceLocation(D->getUsingLocation(), Record);
 909   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
 910   Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
 911   Writer.AddDeclRef(D->FirstUsingShadow.getPointer(), Record);
 912   Record.push_back(D->isTypeName());
 913   Writer.AddDeclRef(Context.getInstantiatedFromUsingDecl(D), Record);
 914   Code = serialization::DECL_USING;
 915 }
 916
 917 void ASTDeclWriter::VisitUsingShadowDecl(UsingShadowDecl *D) {
 918   VisitNamedDecl(D);
 919   Writer.AddDeclRef(D->getTargetDecl(), Record);
 920   Writer.AddDeclRef(D->UsingOrNextShadow, Record);
 921   Writer.AddDeclRef(Context.getInstantiatedFromUsingShadowDecl(D), Record);
 922   Code = serialization::DECL_USING_SHADOW;
 923 }
 924
 925 void ASTDeclWriter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
 926   VisitNamedDecl(D);
 927   Writer.AddSourceLocation(D->getUsingLoc(), Record);
 928   Writer.AddSourceLocation(D->getNamespaceKeyLocation(), Record);
 929   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
 930   Writer.AddDeclRef(D->getNominatedNamespace(), Record);
 931   Writer.AddDeclRef(dyn_cast<Decl>(D->getCommonAncestor()), Record);
 932   Code = serialization::DECL_USING_DIRECTIVE;
 933 }
 934
 935 void ASTDeclWriter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
 936   VisitValueDecl(D);
 937   Writer.AddSourceLocation(D->getUsingLoc(), Record);
 938   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
 939   Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
 940   Code = serialization::DECL_UNRESOLVED_USING_VALUE;
 941 }
 942
 943 void ASTDeclWriter::VisitUnresolvedUsingTypenameDecl(
 944                                                UnresolvedUsingTypenameDecl *D) {
 945   VisitTypeDecl(D);
 946   Writer.AddSourceLocation(D->getTypenameLoc(), Record);
 947   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
 948   Code = serialization::DECL_UNRESOLVED_USING_TYPENAME;
 949 }
 950
 951 void ASTDeclWriter::VisitCXXRecordDecl(CXXRecordDecl *D) {
 952   VisitRecordDecl(D);
 953   Record.push_back(D->isThisDeclarationADefinition());
 954   if (D->isThisDeclarationADefinition())
 955     Writer.AddCXXDefinitionData(D, Record);
 956
 957   enum {
 958     CXXRecNotTemplate = 0, CXXRecTemplate, CXXRecMemberSpecialization
 959   };
 960   if (ClassTemplateDecl *TemplD = D->getDescribedClassTemplate()) {
 961     Record.push_back(CXXRecTemplate);
 962     Writer.AddDeclRef(TemplD, Record);
 963   } else if (MemberSpecializationInfo *MSInfo
 964                = D->getMemberSpecializationInfo()) {
 965     Record.push_back(CXXRecMemberSpecialization);
 966     Writer.AddDeclRef(MSInfo->getInstantiatedFrom(), Record);
 967     Record.push_back(MSInfo->getTemplateSpecializationKind());
 968     Writer.AddSourceLocation(MSInfo->getPointOfInstantiation(), Record);
 969   } else {
 970     Record.push_back(CXXRecNotTemplate);
 971   }
 972
 973   // Store (what we currently believe to be) the key function to avoid
 974   // deserializing every method so we can compute it.
 975   if (D->IsCompleteDefinition)
 976     Writer.AddDeclRef(Context.getCurrentKeyFunction(D), Record);
 977
 978   Code = serialization::DECL_CXX_RECORD;
 979 }
 980
 981 void ASTDeclWriter::VisitCXXMethodDecl(CXXMethodDecl *D) {
 982   VisitFunctionDecl(D);
 983   if (D->isCanonicalDecl()) {
 984     Record.push_back(D->size_overridden_methods());
 985     for (CXXMethodDecl::method_iterator
 986            I = D->begin_overridden_methods(), E = D->end_overridden_methods();
 987            I != E; ++I)
 988       Writer.AddDeclRef(*I, Record);
 989   } else {
 990     // We only need to record overridden methods once for the canonical decl.
 991     Record.push_back(0);
 992   }
 993   Code = serialization::DECL_CXX_METHOD;
 994 }
 995
 996 void ASTDeclWriter::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
 997   VisitCXXMethodDecl(D);
 998
 999   Record.push_back(D->IsExplicitSpecified);
1000   Record.push_back(D->ImplicitlyDefined);
1001   Writer.AddCXXCtorInitializers(D->CtorInitializers, D->NumCtorInitializers,
1002                                 Record);
1003
1004   Code = serialization::DECL_CXX_CONSTRUCTOR;
1005 }
1006
1007 void ASTDeclWriter::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
1008   VisitCXXMethodDecl(D);
1009
1010   Record.push_back(D->ImplicitlyDefined);
1011   Writer.AddDeclRef(D->OperatorDelete, Record);
1012
1013   Code = serialization::DECL_CXX_DESTRUCTOR;
1014 }
1015
1016 void ASTDeclWriter::VisitCXXConversionDecl(CXXConversionDecl *D) {
1017   VisitCXXMethodDecl(D);
1018   Record.push_back(D->IsExplicitSpecified);
1019   Code = serialization::DECL_CXX_CONVERSION;
1020 }
1021
1022 void ASTDeclWriter::VisitImportDecl(ImportDecl *D) {
1023   VisitDecl(D);
1024   Record.push_back(Writer.getSubmoduleID(D->getImportedModule()));
1025   ArrayRef<SourceLocation> IdentifierLocs = D->getIdentifierLocs();
1026   Record.push_back(!IdentifierLocs.empty());
1027   if (IdentifierLocs.empty()) {
1028     Writer.AddSourceLocation(D->getLocEnd(), Record);
1029     Record.push_back(1);
1030   } else {
1031     for (unsigned I = 0, N = IdentifierLocs.size(); I != N; ++I)
1032       Writer.AddSourceLocation(IdentifierLocs[I], Record);
1033     Record.push_back(IdentifierLocs.size());
1034   }
1035   // Note: the number of source locations must always be the last element in
1036   // the record.
1037   Code = serialization::DECL_IMPORT;
1038 }
1039
1040 void ASTDeclWriter::VisitAccessSpecDecl(AccessSpecDecl *D) {
1041   VisitDecl(D);
1042   Writer.AddSourceLocation(D->getColonLoc(), Record);
1043   Code = serialization::DECL_ACCESS_SPEC;
1044 }
1045
1046 void ASTDeclWriter::VisitFriendDecl(FriendDecl *D) {
1047   // Record the number of friend type template parameter lists here
1048   // so as to simplify memory allocation during deserialization.
1049   Record.push_back(D->NumTPLists);
1050   VisitDecl(D);
1051   bool hasFriendDecl = D->Friend.is<NamedDecl*>();
1052   Record.push_back(hasFriendDecl);
1053   if (hasFriendDecl)
1054     Writer.AddDeclRef(D->getFriendDecl(), Record);
1055   else
1056     Writer.AddTypeSourceInfo(D->getFriendType(), Record);
1057   for (unsigned i = 0; i < D->NumTPLists; ++i)
1058     Writer.AddTemplateParameterList(D->getFriendTypeTemplateParameterList(i),
1059                                     Record);
1060   Writer.AddDeclRef(D->getNextFriend(), Record);
1061   Record.push_back(D->UnsupportedFriend);
1062   Writer.AddSourceLocation(D->FriendLoc, Record);
1063   Code = serialization::DECL_FRIEND;
1064 }
1065
1066 void ASTDeclWriter::VisitFriendTemplateDecl(FriendTemplateDecl *D) {
1067   VisitDecl(D);
1068   Record.push_back(D->getNumTemplateParameters());
1069   for (unsigned i = 0, e = D->getNumTemplateParameters(); i != e; ++i)
1070     Writer.AddTemplateParameterList(D->getTemplateParameterList(i), Record);
1071   Record.push_back(D->getFriendDecl() != 0);
1072   if (D->getFriendDecl())
1073     Writer.AddDeclRef(D->getFriendDecl(), Record);
1074   else
1075     Writer.AddTypeSourceInfo(D->getFriendType(), Record);
1076   Writer.AddSourceLocation(D->getFriendLoc(), Record);
1077   Code = serialization::DECL_FRIEND_TEMPLATE;
1078 }
1079
1080 void ASTDeclWriter::VisitTemplateDecl(TemplateDecl *D) {
1081   VisitNamedDecl(D);
1082
1083   Writer.AddDeclRef(D->getTemplatedDecl(), Record);
1084   Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1085 }
1086
1087 void ASTDeclWriter::VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D) {
1088   VisitRedeclarable(D);
1089
1090   // Emit data to initialize CommonOrPrev before VisitTemplateDecl so that
1091   // getCommonPtr() can be used while this is still initializing.
1092   if (D->isFirstDeclaration()) {
1093     // This declaration owns the 'common' pointer, so serialize that data now.
1094     Writer.AddDeclRef(D->getInstantiatedFromMemberTemplate(), Record);
1095     if (D->getInstantiatedFromMemberTemplate())
1096       Record.push_back(D->isMemberSpecialization());
1097   }
1098
1099   VisitTemplateDecl(D);
1100   Record.push_back(D->getIdentifierNamespace());
1101 }
1102
1103 void ASTDeclWriter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1104   VisitRedeclarableTemplateDecl(D);
1105
1106   if (D->isFirstDeclaration()) {
1107     typedef llvm::FoldingSetVector<ClassTemplateSpecializationDecl> CTSDSetTy;
1108     CTSDSetTy &CTSDSet = D->getSpecializations();
1109     Record.push_back(CTSDSet.size());
1110     for (CTSDSetTy::iterator I=CTSDSet.begin(), E = CTSDSet.end(); I!=E; ++I) {
1111       assert(I->isCanonicalDecl() && "Expected only canonical decls in set");
1112       Writer.AddDeclRef(&*I, Record);
1113     }
1114
1115     typedef llvm::FoldingSetVector<ClassTemplatePartialSpecializationDecl>
1116       CTPSDSetTy;
1117     CTPSDSetTy &CTPSDSet = D->getPartialSpecializations();
1118     Record.push_back(CTPSDSet.size());
1119     for (CTPSDSetTy::iterator I=CTPSDSet.begin(), E=CTPSDSet.end(); I!=E; ++I) {
1120       assert(I->isCanonicalDecl() && "Expected only canonical decls in set");
1121       Writer.AddDeclRef(&*I, Record);
1122     }
1123
1124     Writer.AddTypeRef(D->getCommonPtr()->InjectedClassNameType, Record);
1125   }
1126   Code = serialization::DECL_CLASS_TEMPLATE;
1127 }
1128
1129 void ASTDeclWriter::VisitClassTemplateSpecializationDecl(
1130                                            ClassTemplateSpecializationDecl *D) {
1131   VisitCXXRecordDecl(D);
1132
1133   llvm::PointerUnion<ClassTemplateDecl *,
1134                      ClassTemplatePartialSpecializationDecl *> InstFrom
1135     = D->getSpecializedTemplateOrPartial();
1136   if (Decl *InstFromD = InstFrom.dyn_cast<ClassTemplateDecl *>()) {
1137     Writer.AddDeclRef(InstFromD, Record);
1138   } else {
1139     Writer.AddDeclRef(InstFrom.get<ClassTemplatePartialSpecializationDecl *>(),
1140                       Record);
1141     Writer.AddTemplateArgumentList(&D->getTemplateInstantiationArgs(), Record);
1142   }
1143
1144   // Explicit info.
1145   Writer.AddTypeSourceInfo(D->getTypeAsWritten(), Record);
1146   if (D->getTypeAsWritten()) {
1147     Writer.AddSourceLocation(D->getExternLoc(), Record);
1148     Writer.AddSourceLocation(D->getTemplateKeywordLoc(), Record);
1149   }
1150
1151   Writer.AddTemplateArgumentList(&D->getTemplateArgs(), Record);
1152   Writer.AddSourceLocation(D->getPointOfInstantiation(), Record);
1153   Record.push_back(D->getSpecializationKind());
1154   Record.push_back(D->isCanonicalDecl());
1155
1156   if (D->isCanonicalDecl()) {
1157     // When reading, we'll add it to the folding set of the following template.
1158     Writer.AddDeclRef(D->getSpecializedTemplate()->getCanonicalDecl(), Record);
1159   }
1160
1161   Code = serialization::DECL_CLASS_TEMPLATE_SPECIALIZATION;
1162 }
1163
1164 void ASTDeclWriter::VisitClassTemplatePartialSpecializationDecl(
1165                                     ClassTemplatePartialSpecializationDecl *D) {
1166   VisitClassTemplateSpecializationDecl(D);
1167
1168   Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1169
1170   Record.push_back(D->getNumTemplateArgsAsWritten());
1171   for (int i = 0, e = D->getNumTemplateArgsAsWritten(); i != e; ++i)
1172     Writer.AddTemplateArgumentLoc(D->getTemplateArgsAsWritten()[i], Record);
1173
1174   Record.push_back(D->getSequenceNumber());
1175
1176   // These are read/set from/to the first declaration.
1177   if (D->getPreviousDecl() == 0) {
1178     Writer.AddDeclRef(D->getInstantiatedFromMember(), Record);
1179     Record.push_back(D->isMemberSpecialization());
1180   }
1181
1182   Code = serialization::DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION;
1183 }
1184
1185 void ASTDeclWriter::VisitClassScopeFunctionSpecializationDecl(
1186                                     ClassScopeFunctionSpecializationDecl *D) {
1187   VisitDecl(D);
1188   Writer.AddDeclRef(D->getSpecialization(), Record);
1189   Code = serialization::DECL_CLASS_SCOPE_FUNCTION_SPECIALIZATION;
1190 }
1191
1192
1193 void ASTDeclWriter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1194   VisitRedeclarableTemplateDecl(D);
1195
1196   if (D->isFirstDeclaration()) {
1197     // This FunctionTemplateDecl owns the CommonPtr; write it.
1198
1199     // Write the function specialization declarations.
1200     Record.push_back(D->getSpecializations().size());
1201     for (llvm::FoldingSetVector<FunctionTemplateSpecializationInfo>::iterator
1202            I = D->getSpecializations().begin(),
1203            E = D->getSpecializations().end()   ; I != E; ++I) {
1204       assert(I->Function->isCanonicalDecl() &&
1205              "Expected only canonical decls in set");
1206       Writer.AddDeclRef(I->Function, Record);
1207     }
1208   }
1209   Code = serialization::DECL_FUNCTION_TEMPLATE;
1210 }
1211
1212 void ASTDeclWriter::VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D) {
1213   VisitTypeDecl(D);
1214
1215   Record.push_back(D->wasDeclaredWithTypename());
1216   Record.push_back(D->defaultArgumentWasInherited());
1217   Writer.AddTypeSourceInfo(D->getDefaultArgumentInfo(), Record);
1218
1219   Code = serialization::DECL_TEMPLATE_TYPE_PARM;
1220 }
1221
1222 void ASTDeclWriter::VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {
1223   // For an expanded parameter pack, record the number of expansion types here
1224   // so that it's easier for deserialization to allocate the right amount of
1225   // memory.
1226   if (D->isExpandedParameterPack())
1227     Record.push_back(D->getNumExpansionTypes());
1228
1229   VisitDeclaratorDecl(D);
1230   // TemplateParmPosition.
1231   Record.push_back(D->getDepth());
1232   Record.push_back(D->getPosition());
1233
1234   if (D->isExpandedParameterPack()) {
1235     for (unsigned I = 0, N = D->getNumExpansionTypes(); I != N; ++I) {
1236       Writer.AddTypeRef(D->getExpansionType(I), Record);
1237       Writer.AddTypeSourceInfo(D->getExpansionTypeSourceInfo(I), Record);
1238     }
1239
1240     Code = serialization::DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK;
1241   } else {
1242     // Rest of NonTypeTemplateParmDecl.
1243     Record.push_back(D->isParameterPack());
1244     Record.push_back(D->getDefaultArgument() != 0);
1245     if (D->getDefaultArgument()) {
1246       Writer.AddStmt(D->getDefaultArgument());
1247       Record.push_back(D->defaultArgumentWasInherited());
1248     }
1249     Code = serialization::DECL_NON_TYPE_TEMPLATE_PARM;
1250   }
1251 }
1252
1253 void ASTDeclWriter::VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D) {
1254   // For an expanded parameter pack, record the number of expansion types here
1255   // so that it's easier for deserialization to allocate the right amount of
1256   // memory.
1257   if (D->isExpandedParameterPack())
1258     Record.push_back(D->getNumExpansionTemplateParameters());
1259
1260   VisitTemplateDecl(D);
1261   // TemplateParmPosition.
1262   Record.push_back(D->getDepth());
1263   Record.push_back(D->getPosition());
1264
1265   if (D->isExpandedParameterPack()) {
1266     for (unsigned I = 0, N = D->getNumExpansionTemplateParameters();
1267          I != N; ++I)
1268       Writer.AddTemplateParameterList(D->getExpansionTemplateParameters(I),
1269                                       Record);
1270     Code = serialization::DECL_EXPANDED_TEMPLATE_TEMPLATE_PARM_PACK;
1271   } else {
1272     // Rest of TemplateTemplateParmDecl.
1273     Writer.AddTemplateArgumentLoc(D->getDefaultArgument(), Record);
1274     Record.push_back(D->defaultArgumentWasInherited());
1275     Record.push_back(D->isParameterPack());
1276     Code = serialization::DECL_TEMPLATE_TEMPLATE_PARM;
1277   }
1278 }
1279
1280 void ASTDeclWriter::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) {
1281   VisitRedeclarableTemplateDecl(D);
1282   Code = serialization::DECL_TYPE_ALIAS_TEMPLATE;
1283 }
1284
1285 void ASTDeclWriter::VisitStaticAssertDecl(StaticAssertDecl *D) {
1286   VisitDecl(D);
1287   Writer.AddStmt(D->getAssertExpr());
1288   Record.push_back(D->isFailed());
1289   Writer.AddStmt(D->getMessage());
1290   Writer.AddSourceLocation(D->getRParenLoc(), Record);
1291   Code = serialization::DECL_STATIC_ASSERT;
1292 }
1293
1294 /// \brief Emit the DeclContext part of a declaration context decl.
1295 ///
1296 /// \param LexicalOffset the offset at which the DECL_CONTEXT_LEXICAL
1297 /// block for this declaration context is stored. May be 0 to indicate
1298 /// that there are no declarations stored within this context.
1299 ///
1300 /// \param VisibleOffset the offset at which the DECL_CONTEXT_VISIBLE
1301 /// block for this declaration context is stored. May be 0 to indicate
1302 /// that there are no declarations visible from this context. Note
1303 /// that this value will not be emitted for non-primary declaration
1304 /// contexts.
1305 void ASTDeclWriter::VisitDeclContext(DeclContext *DC, uint64_t LexicalOffset,
1306                                      uint64_t VisibleOffset) {
1307   Record.push_back(LexicalOffset);
1308   Record.push_back(VisibleOffset);
1309 }
1310
1311 template <typename T>
1312 void ASTDeclWriter::VisitRedeclarable(Redeclarable<T> *D) {
1313   T *First = D->getFirstDeclaration();
1314   if (First->getMostRecentDecl() != First) {
1315     assert(isRedeclarableDeclKind(static_cast<T *>(D)->getKind()) &&
1316            "Not considered redeclarable?");
1317
1318     // There is more than one declaration of this entity, so we will need to
1319     // write a redeclaration chain.
1320     Writer.AddDeclRef(First, Record);
1321     Writer.Redeclarations.insert(First);
1322
1323     // Make sure that we serialize both the previous and the most-recent
1324     // declarations, which (transitively) ensures that all declarations in the
1325     // chain get serialized.
1326     (void)Writer.GetDeclRef(D->getPreviousDecl());
1327     (void)Writer.GetDeclRef(First->getMostRecentDecl());
1328   } else {
1329     // We use the sentinel value 0 to indicate an only declaration.
1330     Record.push_back(0);
1331   }
1332
1333 }
1334
1335 void ASTDeclWriter::VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D) {
1336   Record.push_back(D->varlist_size());
1337   VisitDecl(D);
1338   for (OMPThreadPrivateDecl::varlist_iterator I = D->varlist_begin(),
1339                                               E = D->varlist_end();
1340        I != E; ++I)
1341     Writer.AddStmt(*I);
1342   Code = serialization::DECL_OMP_THREADPRIVATE;
1343 }
1344
1345 //===----------------------------------------------------------------------===//
1346 // ASTWriter Implementation
1347 //===----------------------------------------------------------------------===//
1348
1349 void ASTWriter::WriteDeclsBlockAbbrevs() {
1350   using namespace llvm;
1351
1352   BitCodeAbbrev *Abv;
1353
1354   // Abbreviation for DECL_FIELD
1355   Abv = new BitCodeAbbrev();
1356   Abv->Add(BitCodeAbbrevOp(serialization::DECL_FIELD));
1357   // Decl
1358   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1359   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1360   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1361   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1362   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1363   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1364   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1365   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1366   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1367   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1368   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1369   // NamedDecl
1370   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1371   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1372   // ValueDecl
1373   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1374   // DeclaratorDecl
1375   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1376   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1377   // FieldDecl
1378   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1379   Abv->Add(BitCodeAbbrevOp(0));                       //getBitWidth
1380   // Type Source Info
1381   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1382   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1383   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1384   DeclFieldAbbrev = Stream.EmitAbbrev(Abv);
1385
1386   // Abbreviation for DECL_OBJC_IVAR
1387   Abv = new BitCodeAbbrev();
1388   Abv->Add(BitCodeAbbrevOp(serialization::DECL_OBJC_IVAR));
1389   // Decl
1390   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1391   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1392   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1393   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1394   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1395   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1396   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1397   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1398   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1399   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1400   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1401   // NamedDecl
1402   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1403   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1404   // ValueDecl
1405   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1406   // DeclaratorDecl
1407   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1408   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1409   // FieldDecl
1410   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1411   Abv->Add(BitCodeAbbrevOp(0));                       //getBitWidth
1412   // ObjC Ivar
1413   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getAccessControl
1414   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getSynthesize
1415   // Type Source Info
1416   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1417   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1418   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1419   DeclObjCIvarAbbrev = Stream.EmitAbbrev(Abv);
1420
1421   // Abbreviation for DECL_ENUM
1422   Abv = new BitCodeAbbrev();
1423   Abv->Add(BitCodeAbbrevOp(serialization::DECL_ENUM));
1424   // Redeclarable
1425   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1426   // Decl
1427   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1428   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1429   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1430   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1431   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1432   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1433   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1434   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1435   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1436   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1437   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1438   // NamedDecl
1439   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1440   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1441   // TypeDecl
1442   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1443   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1444   // TagDecl
1445   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1446   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1447   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1448   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1449   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1450   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1451   Abv->Add(BitCodeAbbrevOp(0));                         // hasExtInfo
1452   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // TypedefNameAnonDecl
1453   // EnumDecl
1454   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // AddTypeRef
1455   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IntegerType
1456   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getPromotionType
1457   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumPositiveBits
1458   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumNegativeBits
1459   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScoped
1460   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScopedUsingClassTag
1461   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isFixed
1462   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // InstantiatedMembEnum
1463   // DC
1464   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1465   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1466   DeclEnumAbbrev = Stream.EmitAbbrev(Abv);
1467
1468   // Abbreviation for DECL_RECORD
1469   Abv = new BitCodeAbbrev();
1470   Abv->Add(BitCodeAbbrevOp(serialization::DECL_RECORD));
1471   // Redeclarable
1472   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1473   // Decl
1474   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1475   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1476   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1477   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1478   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1479   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1480   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1481   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1482   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1483   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1484   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1485   // NamedDecl
1486   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1487   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1488   // TypeDecl
1489   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1490   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1491   // TagDecl
1492   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1493   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1494   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1495   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1496   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1497   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1498   Abv->Add(BitCodeAbbrevOp(0));                         // hasExtInfo
1499   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // TypedefNameAnonDecl
1500   // RecordDecl
1501   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // FlexibleArrayMember
1502   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // AnonymousStructUnion
1503   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasObjectMember
1504   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasVolatileMember
1505   // DC
1506   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1507   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1508   DeclRecordAbbrev = Stream.EmitAbbrev(Abv);
1509
1510   // Abbreviation for DECL_PARM_VAR
1511   Abv = new BitCodeAbbrev();
1512   Abv->Add(BitCodeAbbrevOp(serialization::DECL_PARM_VAR));
1513   // Redeclarable
1514   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1515   // Decl
1516   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1517   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1518   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1519   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1520   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1521   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1522   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1523   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1524   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1525   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1526   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1527   // NamedDecl
1528   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1529   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1530   // ValueDecl
1531   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1532   // DeclaratorDecl
1533   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1534   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1535   // VarDecl
1536   Abv->Add(BitCodeAbbrevOp(0));                       // StorageClass
1537   Abv->Add(BitCodeAbbrevOp(0));                       // getTSCSpec
1538   Abv->Add(BitCodeAbbrevOp(0));                       // hasCXXDirectInitializer
1539   Abv->Add(BitCodeAbbrevOp(0));                       // isExceptionVariable
1540   Abv->Add(BitCodeAbbrevOp(0));                       // isNRVOVariable
1541   Abv->Add(BitCodeAbbrevOp(0));                       // isCXXForRangeDecl
1542   Abv->Add(BitCodeAbbrevOp(0));                       // isARCPseudoStrong
1543   Abv->Add(BitCodeAbbrevOp(0));                       // isConstexpr
1544   Abv->Add(BitCodeAbbrevOp(0));                       // Linkage
1545   Abv->Add(BitCodeAbbrevOp(0));                       // HasInit
1546   Abv->Add(BitCodeAbbrevOp(0));                   // HasMemberSpecializationInfo
1547   // ParmVarDecl
1548   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsObjCMethodParameter
1549   Abv->Add(BitCodeAbbrevOp(0));                       // ScopeDepth
1550   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ScopeIndex
1551   Abv->Add(BitCodeAbbrevOp(0));                       // ObjCDeclQualifier
1552   Abv->Add(BitCodeAbbrevOp(0));                       // KNRPromoted
1553   Abv->Add(BitCodeAbbrevOp(0));                       // HasInheritedDefaultArg
1554   Abv->Add(BitCodeAbbrevOp(0));                   // HasUninstantiatedDefaultArg
1555   // Type Source Info
1556   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1557   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1558   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1559   DeclParmVarAbbrev = Stream.EmitAbbrev(Abv);
1560
1561   // Abbreviation for DECL_TYPEDEF
1562   Abv = new BitCodeAbbrev();
1563   Abv->Add(BitCodeAbbrevOp(serialization::DECL_TYPEDEF));
1564   // Redeclarable
1565   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1566   // Decl
1567   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1568   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1569   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1570   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1571   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1572   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1573   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1574   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1575   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1576   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1577   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1578   // NamedDecl
1579   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1580   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1581   // TypeDecl
1582   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1583   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1584   // TypedefDecl
1585   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1586   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1587   DeclTypedefAbbrev = Stream.EmitAbbrev(Abv);
1588
1589   // Abbreviation for DECL_VAR
1590   Abv = new BitCodeAbbrev();
1591   Abv->Add(BitCodeAbbrevOp(serialization::DECL_VAR));
1592   // Redeclarable
1593   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1594   // Decl
1595   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1596   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1597   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1598   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1599   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1600   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1601   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1602   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1603   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1604   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1605   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1606   // NamedDecl
1607   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1608   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1609   // ValueDecl
1610   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1611   // DeclaratorDecl
1612   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1613   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1614   // VarDecl
1615   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // StorageClass
1616   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // getTSCSpec
1617   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // CXXDirectInitializer
1618   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isExceptionVariable
1619   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isNRVOVariable
1620   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCXXForRangeDecl
1621   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isARCPseudoStrong
1622   Abv->Add(BitCodeAbbrevOp(0));                         // isConstexpr
1623   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // Linkage
1624   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // HasInit
1625   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // HasMemberSpecInfo
1626   // Type Source Info
1627   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1628   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1629   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1630   DeclVarAbbrev = Stream.EmitAbbrev(Abv);
1631
1632   // Abbreviation for EXPR_DECL_REF
1633   Abv = new BitCodeAbbrev();
1634   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_DECL_REF));
1635   //Stmt
1636   //Expr
1637   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1638   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
1639   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
1640   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
1641   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
1642   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
1643   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
1644   //DeclRefExpr
1645   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HasQualifier
1646   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //GetDeclFound
1647   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ExplicitTemplateArgs
1648   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HadMultipleCandidates
1649   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //RefersToEnclosingLocal
1650   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclRef
1651   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1652   DeclRefExprAbbrev = Stream.EmitAbbrev(Abv);
1653
1654   // Abbreviation for EXPR_INTEGER_LITERAL
1655   Abv = new BitCodeAbbrev();
1656   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_INTEGER_LITERAL));
1657   //Stmt
1658   //Expr
1659   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1660   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
1661   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
1662   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
1663   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
1664   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
1665   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
1666   //Integer Literal
1667   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1668   Abv->Add(BitCodeAbbrevOp(32));                      // Bit Width
1669   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Value
1670   IntegerLiteralAbbrev = Stream.EmitAbbrev(Abv);
1671
1672   // Abbreviation for EXPR_CHARACTER_LITERAL
1673   Abv = new BitCodeAbbrev();
1674   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_CHARACTER_LITERAL));
1675   //Stmt
1676   //Expr
1677   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1678   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
1679   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
1680   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
1681   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
1682   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
1683   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
1684   //Character Literal
1685   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getValue
1686   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1687   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // getKind
1688   CharacterLiteralAbbrev = Stream.EmitAbbrev(Abv);
1689
1690   Abv = new BitCodeAbbrev();
1691   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_LEXICAL));
1692   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1693   DeclContextLexicalAbbrev = Stream.EmitAbbrev(Abv);
1694
1695   Abv = new BitCodeAbbrev();
1696   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_VISIBLE));
1697   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1698   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1699   DeclContextVisibleLookupAbbrev = Stream.EmitAbbrev(Abv);
1700 }
1701
1702 /// isRequiredDecl - Check if this is a "required" Decl, which must be seen by
1703 /// consumers of the AST.
1704 ///
1705 /// Such decls will always be deserialized from the AST file, so we would like
1706 /// this to be as restrictive as possible. Currently the predicate is driven by
1707 /// code generation requirements, if other clients have a different notion of
1708 /// what is "required" then we may have to consider an alternate scheme where
1709 /// clients can iterate over the top-level decls and get information on them,
1710 /// without necessary deserializing them. We could explicitly require such
1711 /// clients to use a separate API call to "realize" the decl. This should be
1712 /// relatively painless since they would presumably only do it for top-level
1713 /// decls.
1714 static bool isRequiredDecl(const Decl *D, ASTContext &Context) {
1715   // An ObjCMethodDecl is never considered as "required" because its
1716   // implementation container always is.
1717
1718   // File scoped assembly or obj-c implementation must be seen.
1719   if (isa<FileScopeAsmDecl>(D) || isa<ObjCImplDecl>(D))
1720     return true;
1721
1722   return Context.DeclMustBeEmitted(D);
1723 }
1724
1725 void ASTWriter::WriteDecl(ASTContext &Context, Decl *D) {
1726   // Switch case IDs are per Decl.
1727   ClearSwitchCaseIDs();
1728
1729   RecordData Record;
1730   ASTDeclWriter W(*this, Context, Record);
1731
1732   // Determine the ID for this declaration.
1733   serialization::DeclID ID;
1734   if (D->isFromASTFile())
1735     ID = getDeclID(D);
1736   else {
1737     serialization::DeclID &IDR = DeclIDs[D];
1738     if (IDR == 0)
1739       IDR = NextDeclID++;
1740
1741     ID= IDR;
1742   }
1743
1744   bool isReplacingADecl = ID < FirstDeclID;
1745
1746   // If this declaration is also a DeclContext, write blocks for the
1747   // declarations that lexically stored inside its context and those
1748   // declarations that are visible from its context. These blocks
1749   // are written before the declaration itself so that we can put
1750   // their offsets into the record for the declaration.
1751   uint64_t LexicalOffset = 0;
1752   uint64_t VisibleOffset = 0;
1753   DeclContext *DC = dyn_cast<DeclContext>(D);
1754   if (DC) {
1755     if (isReplacingADecl) {
1756       // It is replacing a decl from a chained PCH; make sure that the
1757       // DeclContext is fully loaded.
1758       if (DC->hasExternalLexicalStorage())
1759         DC->LoadLexicalDeclsFromExternalStorage();
1760       if (DC->hasExternalVisibleStorage())
1761         Chain->completeVisibleDeclsMap(DC);
1762     }
1763     LexicalOffset = WriteDeclContextLexicalBlock(Context, DC);
1764     VisibleOffset = WriteDeclContextVisibleBlock(Context, DC);
1765   }
1766
1767   if (isReplacingADecl) {
1768     // We're replacing a decl in a previous file.
1769     ReplacedDecls.push_back(ReplacedDeclInfo(ID, Stream.GetCurrentBitNo(),
1770                                              D->getLocation()));
1771   } else {
1772     unsigned Index = ID - FirstDeclID;
1773
1774     // Record the offset for this declaration
1775     SourceLocation Loc = D->getLocation();
1776     if (DeclOffsets.size() == Index)
1777       DeclOffsets.push_back(DeclOffset(Loc, Stream.GetCurrentBitNo()));
1778     else if (DeclOffsets.size() < Index) {
1779       DeclOffsets.resize(Index+1);
1780       DeclOffsets[Index].setLocation(Loc);
1781       DeclOffsets[Index].BitOffset = Stream.GetCurrentBitNo();
1782     }
1783
1784     SourceManager &SM = Context.getSourceManager();
1785     if (Loc.isValid() && SM.isLocalSourceLocation(Loc))
1786       associateDeclWithFile(D, ID);
1787   }
1788
1789   // Build and emit a record for this declaration
1790   Record.clear();
1791   W.Code = (serialization::DeclCode)0;
1792   W.AbbrevToUse = 0;
1793   W.Visit(D);
1794   if (DC) W.VisitDeclContext(DC, LexicalOffset, VisibleOffset);
1795
1796   if (!W.Code)
1797     llvm::report_fatal_error(StringRef("unexpected declaration kind '") +
1798                             D->getDeclKindName() + "'");
1799   Stream.EmitRecord(W.Code, Record, W.AbbrevToUse);
1800
1801   // Flush any expressions that were written as part of this declaration.
1802   FlushStmts();
1803
1804   // Flush C++ base specifiers, if there are any.
1805   FlushCXXBaseSpecifiers();
1806
1807   // Note "external" declarations so that we can add them to a record in the
1808   // AST file later.
1809   //
1810   // FIXME: This should be renamed, the predicate is much more complicated.
1811   if (isRequiredDecl(D, Context))
1812     ExternalDefinitions.push_back(ID);
1813 }