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 VisitVarTemplateSpecializationDecl(VarTemplateSpecializationDecl *D);
  72     void VisitVarTemplatePartialSpecializationDecl(
  73         VarTemplatePartialSpecializationDecl *D);
  74     void VisitClassScopeFunctionSpecializationDecl(
  75                                        ClassScopeFunctionSpecializationDecl *D);
  76     void VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D);
  77     void VisitValueDecl(ValueDecl *D);
  78     void VisitEnumConstantDecl(EnumConstantDecl *D);
  79     void VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
  80     void VisitDeclaratorDecl(DeclaratorDecl *D);
  81     void VisitFunctionDecl(FunctionDecl *D);
  82     void VisitCXXMethodDecl(CXXMethodDecl *D);
  83     void VisitCXXConstructorDecl(CXXConstructorDecl *D);
  84     void VisitCXXDestructorDecl(CXXDestructorDecl *D);
  85     void VisitCXXConversionDecl(CXXConversionDecl *D);
  86     void VisitFieldDecl(FieldDecl *D);
  87     void VisitMSPropertyDecl(MSPropertyDecl *D);
  88     void VisitIndirectFieldDecl(IndirectFieldDecl *D);
  89     void VisitVarDecl(VarDecl *D);
  90     void VisitImplicitParamDecl(ImplicitParamDecl *D);
  91     void VisitParmVarDecl(ParmVarDecl *D);
  92     void VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D);
  93     void VisitTemplateDecl(TemplateDecl *D);
  94     void VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D);
  95     void VisitClassTemplateDecl(ClassTemplateDecl *D);
  96     void VisitVarTemplateDecl(VarTemplateDecl *D);
  97     void VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
  98     void VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D);
  99     void VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D);
 100     void VisitUsingDecl(UsingDecl *D);
 101     void VisitUsingShadowDecl(UsingShadowDecl *D);
 102     void VisitLinkageSpecDecl(LinkageSpecDecl *D);
 103     void VisitFileScopeAsmDecl(FileScopeAsmDecl *D);
 104     void VisitImportDecl(ImportDecl *D);
 105     void VisitAccessSpecDecl(AccessSpecDecl *D);
 106     void VisitFriendDecl(FriendDecl *D);
 107     void VisitFriendTemplateDecl(FriendTemplateDecl *D);
 108     void VisitStaticAssertDecl(StaticAssertDecl *D);
 109     void VisitBlockDecl(BlockDecl *D);
 110     void VisitCapturedDecl(CapturedDecl *D);
 111     void VisitEmptyDecl(EmptyDecl *D);
 112
 113     void VisitDeclContext(DeclContext *DC, uint64_t LexicalOffset,
 114                           uint64_t VisibleOffset);
 115     template <typename T> void VisitRedeclarable(Redeclarable<T> *D);
 116
 117
 118     // FIXME: Put in the same order is DeclNodes.td?
 119     void VisitObjCMethodDecl(ObjCMethodDecl *D);
 120     void VisitObjCContainerDecl(ObjCContainerDecl *D);
 121     void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
 122     void VisitObjCIvarDecl(ObjCIvarDecl *D);
 123     void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
 124     void VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D);
 125     void VisitObjCCategoryDecl(ObjCCategoryDecl *D);
 126     void VisitObjCImplDecl(ObjCImplDecl *D);
 127     void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
 128     void VisitObjCImplementationDecl(ObjCImplementationDecl *D);
 129     void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D);
 130     void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
 131     void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
 132     void VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D);
 133   };
 134 }
 135
 136 void ASTDeclWriter::Visit(Decl *D) {
 137   DeclVisitor<ASTDeclWriter>::Visit(D);
 138
 139   // Source locations require array (variable-length) abbreviations.  The
 140   // abbreviation infrastructure requires that arrays are encoded last, so
 141   // we handle it here in the case of those classes derived from DeclaratorDecl
 142   if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)){
 143     Writer.AddTypeSourceInfo(DD->getTypeSourceInfo(), Record);
 144   }
 145
 146   // Handle FunctionDecl's body here and write it after all other Stmts/Exprs
 147   // have been written. We want it last because we will not read it back when
 148   // retrieving it from the AST, we'll just lazily set the offset.
 149   if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
 150     Record.push_back(FD->doesThisDeclarationHaveABody());
 151     if (FD->doesThisDeclarationHaveABody())
 152       Writer.AddStmt(FD->getBody());
 153   }
 154 }
 155
 156 void ASTDeclWriter::VisitDecl(Decl *D) {
 157   Writer.AddDeclRef(cast_or_null<Decl>(D->getDeclContext()), Record);
 158   Writer.AddDeclRef(cast_or_null<Decl>(D->getLexicalDeclContext()), Record);
 159   Record.push_back(D->isInvalidDecl());
 160   Record.push_back(D->hasAttrs());
 161   if (D->hasAttrs())
 162     Writer.WriteAttributes(ArrayRef<const Attr*>(D->getAttrs().begin(),
 163                                                  D->getAttrs().size()), Record);
 164   Record.push_back(D->isImplicit());
 165   Record.push_back(D->isUsed(false));
 166   Record.push_back(D->isReferenced());
 167   Record.push_back(D->isTopLevelDeclInObjCContainer());
 168   Record.push_back(D->getAccess());
 169   Record.push_back(D->isModulePrivate());
 170   Record.push_back(Writer.inferSubmoduleIDFromLocation(D->getLocation()));
 171 }
 172
 173 void ASTDeclWriter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
 174   llvm_unreachable("Translation units aren't directly serialized");
 175 }
 176
 177 void ASTDeclWriter::VisitNamedDecl(NamedDecl *D) {
 178   VisitDecl(D);
 179   Writer.AddDeclarationName(D->getDeclName(), Record);
 180 }
 181
 182 void ASTDeclWriter::VisitTypeDecl(TypeDecl *D) {
 183   VisitNamedDecl(D);
 184   Writer.AddSourceLocation(D->getLocStart(), Record);
 185   Writer.AddTypeRef(QualType(D->getTypeForDecl(), 0), Record);
 186 }
 187
 188 void ASTDeclWriter::VisitTypedefNameDecl(TypedefNameDecl *D) {
 189   VisitRedeclarable(D);
 190   VisitTypeDecl(D);
 191   Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record);
 192   Record.push_back(D->isModed());
 193   if (D->isModed())
 194     Writer.AddTypeRef(D->getUnderlyingType(), Record);
 195 }
 196
 197 void ASTDeclWriter::VisitTypedefDecl(TypedefDecl *D) {
 198   VisitTypedefNameDecl(D);
 199   if (!D->hasAttrs() &&
 200       !D->isImplicit() &&
 201       !D->isUsed(false) &&
 202       D->getFirstDecl() == D->getMostRecentDecl() &&
 203       !D->isInvalidDecl() &&
 204       !D->isReferenced() &&
 205       !D->isTopLevelDeclInObjCContainer() &&
 206       D->getAccess() == AS_none &&
 207       !D->isModulePrivate() &&
 208       D->getDeclName().getNameKind() == DeclarationName::Identifier)
 209     AbbrevToUse = Writer.getDeclTypedefAbbrev();
 210
 211   Code = serialization::DECL_TYPEDEF;
 212 }
 213
 214 void ASTDeclWriter::VisitTypeAliasDecl(TypeAliasDecl *D) {
 215   VisitTypedefNameDecl(D);
 216   Code = serialization::DECL_TYPEALIAS;
 217 }
 218
 219 void ASTDeclWriter::VisitTagDecl(TagDecl *D) {
 220   VisitRedeclarable(D);
 221   VisitTypeDecl(D);
 222   Record.push_back(D->getIdentifierNamespace());
 223   Record.push_back((unsigned)D->getTagKind()); // FIXME: stable encoding
 224   Record.push_back(D->isCompleteDefinition());
 225   Record.push_back(D->isEmbeddedInDeclarator());
 226   Record.push_back(D->isFreeStanding());
 227   Record.push_back(D->isCompleteDefinitionRequired());
 228   Writer.AddSourceLocation(D->getRBraceLoc(), Record);
 229   Record.push_back(D->hasExtInfo());
 230   if (D->hasExtInfo())
 231     Writer.AddQualifierInfo(*D->getExtInfo(), Record);
 232   else if (D->hasDeclaratorForAnonDecl())
 233     Writer.AddDeclRef(D->getDeclaratorForAnonDecl(), Record);
 234   else
 235     Writer.AddDeclRef(D->getTypedefNameForAnonDecl(), Record);
 236 }
 237
 238 void ASTDeclWriter::VisitEnumDecl(EnumDecl *D) {
 239   VisitTagDecl(D);
 240   Writer.AddTypeSourceInfo(D->getIntegerTypeSourceInfo(), Record);
 241   if (!D->getIntegerTypeSourceInfo())
 242     Writer.AddTypeRef(D->getIntegerType(), Record);
 243   Writer.AddTypeRef(D->getPromotionType(), Record);
 244   Record.push_back(D->getNumPositiveBits());
 245   Record.push_back(D->getNumNegativeBits());
 246   Record.push_back(D->isScoped());
 247   Record.push_back(D->isScopedUsingClassTag());
 248   Record.push_back(D->isFixed());
 249   if (MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo()) {
 250     Writer.AddDeclRef(MemberInfo->getInstantiatedFrom(), Record);
 251     Record.push_back(MemberInfo->getTemplateSpecializationKind());
 252     Writer.AddSourceLocation(MemberInfo->getPointOfInstantiation(), Record);
 253   } else {
 254     Writer.AddDeclRef(0, Record);
 255   }
 256
 257   if (!D->hasAttrs() &&
 258       !D->isImplicit() &&
 259       !D->isUsed(false) &&
 260       !D->hasExtInfo() &&
 261       D->getFirstDecl() == D->getMostRecentDecl() &&
 262       !D->isInvalidDecl() &&
 263       !D->isReferenced() &&
 264       !D->isTopLevelDeclInObjCContainer() &&
 265       D->getAccess() == AS_none &&
 266       !D->isModulePrivate() &&
 267       !CXXRecordDecl::classofKind(D->getKind()) &&
 268       !D->getIntegerTypeSourceInfo() &&
 269       !D->getMemberSpecializationInfo() &&
 270       D->getDeclName().getNameKind() == DeclarationName::Identifier)
 271     AbbrevToUse = Writer.getDeclEnumAbbrev();
 272
 273   Code = serialization::DECL_ENUM;
 274 }
 275
 276 void ASTDeclWriter::VisitRecordDecl(RecordDecl *D) {
 277   VisitTagDecl(D);
 278   Record.push_back(D->hasFlexibleArrayMember());
 279   Record.push_back(D->isAnonymousStructOrUnion());
 280   Record.push_back(D->hasObjectMember());
 281   Record.push_back(D->hasVolatileMember());
 282
 283   if (!D->hasAttrs() &&
 284       !D->isImplicit() &&
 285       !D->isUsed(false) &&
 286       !D->hasExtInfo() &&
 287       D->getFirstDecl() == D->getMostRecentDecl() &&
 288       !D->isInvalidDecl() &&
 289       !D->isReferenced() &&
 290       !D->isTopLevelDeclInObjCContainer() &&
 291       D->getAccess() == AS_none &&
 292       !D->isModulePrivate() &&
 293       !CXXRecordDecl::classofKind(D->getKind()) &&
 294       D->getDeclName().getNameKind() == DeclarationName::Identifier)
 295     AbbrevToUse = Writer.getDeclRecordAbbrev();
 296
 297   Code = serialization::DECL_RECORD;
 298 }
 299
 300 void ASTDeclWriter::VisitValueDecl(ValueDecl *D) {
 301   VisitNamedDecl(D);
 302   Writer.AddTypeRef(D->getType(), Record);
 303 }
 304
 305 void ASTDeclWriter::VisitEnumConstantDecl(EnumConstantDecl *D) {
 306   VisitValueDecl(D);
 307   Record.push_back(D->getInitExpr()? 1 : 0);
 308   if (D->getInitExpr())
 309     Writer.AddStmt(D->getInitExpr());
 310   Writer.AddAPSInt(D->getInitVal(), Record);
 311
 312   Code = serialization::DECL_ENUM_CONSTANT;
 313 }
 314
 315 void ASTDeclWriter::VisitDeclaratorDecl(DeclaratorDecl *D) {
 316   VisitValueDecl(D);
 317   Writer.AddSourceLocation(D->getInnerLocStart(), Record);
 318   Record.push_back(D->hasExtInfo());
 319   if (D->hasExtInfo())
 320     Writer.AddQualifierInfo(*D->getExtInfo(), Record);
 321 }
 322
 323 void ASTDeclWriter::VisitFunctionDecl(FunctionDecl *D) {
 324   VisitRedeclarable(D);
 325   VisitDeclaratorDecl(D);
 326
 327   Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
 328   Record.push_back(D->getIdentifierNamespace());
 329
 330   // FunctionDecl's body is handled last at ASTWriterDecl::Visit,
 331   // after everything else is written.
 332
 333   Record.push_back(D->getStorageClass()); // FIXME: stable encoding
 334   Record.push_back(D->IsInline);
 335   Record.push_back(D->isInlineSpecified());
 336   Record.push_back(D->isVirtualAsWritten());
 337   Record.push_back(D->isPure());
 338   Record.push_back(D->hasInheritedPrototype());
 339   Record.push_back(D->hasWrittenPrototype());
 340   Record.push_back(D->isDeletedAsWritten());
 341   Record.push_back(D->isTrivial());
 342   Record.push_back(D->isDefaulted());
 343   Record.push_back(D->isExplicitlyDefaulted());
 344   Record.push_back(D->hasImplicitReturnZero());
 345   Record.push_back(D->isConstexpr());
 346   Record.push_back(D->HasSkippedBody);
 347   Record.push_back(D->isLateTemplateParsed());
 348   Record.push_back(D->getLinkageInternal());
 349   Writer.AddSourceLocation(D->getLocEnd(), Record);
 350
 351   Record.push_back(D->getTemplatedKind());
 352   switch (D->getTemplatedKind()) {
 353   case FunctionDecl::TK_NonTemplate:
 354     break;
 355   case FunctionDecl::TK_FunctionTemplate:
 356     Writer.AddDeclRef(D->getDescribedFunctionTemplate(), Record);
 357     break;
 358   case FunctionDecl::TK_MemberSpecialization: {
 359     MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo();
 360     Writer.AddDeclRef(MemberInfo->getInstantiatedFrom(), Record);
 361     Record.push_back(MemberInfo->getTemplateSpecializationKind());
 362     Writer.AddSourceLocation(MemberInfo->getPointOfInstantiation(), Record);
 363     break;
 364   }
 365   case FunctionDecl::TK_FunctionTemplateSpecialization: {
 366     FunctionTemplateSpecializationInfo *
 367       FTSInfo = D->getTemplateSpecializationInfo();
 368     Writer.AddDeclRef(FTSInfo->getTemplate(), Record);
 369     Record.push_back(FTSInfo->getTemplateSpecializationKind());
 370
 371     // Template arguments.
 372     Writer.AddTemplateArgumentList(FTSInfo->TemplateArguments, Record);
 373
 374     // Template args as written.
 375     Record.push_back(FTSInfo->TemplateArgumentsAsWritten != 0);
 376     if (FTSInfo->TemplateArgumentsAsWritten) {
 377       Record.push_back(FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs);
 378       for (int i=0, e = FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs;
 379              i!=e; ++i)
 380         Writer.AddTemplateArgumentLoc((*FTSInfo->TemplateArgumentsAsWritten)[i],
 381                                       Record);
 382       Writer.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->LAngleLoc,
 383                                Record);
 384       Writer.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->RAngleLoc,
 385                                Record);
 386     }
 387
 388     Writer.AddSourceLocation(FTSInfo->getPointOfInstantiation(), Record);
 389
 390     if (D->isCanonicalDecl()) {
 391       // Write the template that contains the specializations set. We will
 392       // add a FunctionTemplateSpecializationInfo to it when reading.
 393       Writer.AddDeclRef(FTSInfo->getTemplate()->getCanonicalDecl(), Record);
 394     }
 395     break;
 396   }
 397   case FunctionDecl::TK_DependentFunctionTemplateSpecialization: {
 398     DependentFunctionTemplateSpecializationInfo *
 399       DFTSInfo = D->getDependentSpecializationInfo();
 400
 401     // Templates.
 402     Record.push_back(DFTSInfo->getNumTemplates());
 403     for (int i=0, e = DFTSInfo->getNumTemplates(); i != e; ++i)
 404       Writer.AddDeclRef(DFTSInfo->getTemplate(i), Record);
 405
 406     // Templates args.
 407     Record.push_back(DFTSInfo->getNumTemplateArgs());
 408     for (int i=0, e = DFTSInfo->getNumTemplateArgs(); i != e; ++i)
 409       Writer.AddTemplateArgumentLoc(DFTSInfo->getTemplateArg(i), Record);
 410     Writer.AddSourceLocation(DFTSInfo->getLAngleLoc(), Record);
 411     Writer.AddSourceLocation(DFTSInfo->getRAngleLoc(), Record);
 412     break;
 413   }
 414   }
 415
 416   Record.push_back(D->param_size());
 417   for (FunctionDecl::param_iterator P = D->param_begin(), PEnd = D->param_end();
 418        P != PEnd; ++P)
 419     Writer.AddDeclRef(*P, Record);
 420   Code = serialization::DECL_FUNCTION;
 421 }
 422
 423 void ASTDeclWriter::VisitObjCMethodDecl(ObjCMethodDecl *D) {
 424   VisitNamedDecl(D);
 425   // FIXME: convert to LazyStmtPtr?
 426   // Unlike C/C++, method bodies will never be in header files.
 427   bool HasBodyStuff = D->getBody() != 0     ||
 428                       D->getSelfDecl() != 0 || D->getCmdDecl() != 0;
 429   Record.push_back(HasBodyStuff);
 430   if (HasBodyStuff) {
 431     Writer.AddStmt(D->getBody());
 432     Writer.AddDeclRef(D->getSelfDecl(), Record);
 433     Writer.AddDeclRef(D->getCmdDecl(), Record);
 434   }
 435   Record.push_back(D->isInstanceMethod());
 436   Record.push_back(D->isVariadic());
 437   Record.push_back(D->isPropertyAccessor());
 438   Record.push_back(D->isDefined());
 439   Record.push_back(D->IsOverriding);
 440   Record.push_back(D->HasSkippedBody);
 441
 442   Record.push_back(D->IsRedeclaration);
 443   Record.push_back(D->HasRedeclaration);
 444   if (D->HasRedeclaration) {
 445     assert(Context.getObjCMethodRedeclaration(D));
 446     Writer.AddDeclRef(Context.getObjCMethodRedeclaration(D), Record);
 447   }
 448
 449   // FIXME: stable encoding for @required/@optional
 450   Record.push_back(D->getImplementationControl());
 451   // FIXME: stable encoding for in/out/inout/bycopy/byref/oneway
 452   Record.push_back(D->getObjCDeclQualifier());
 453   Record.push_back(D->hasRelatedResultType());
 454   Writer.AddTypeRef(D->getResultType(), Record);
 455   Writer.AddTypeSourceInfo(D->getResultTypeSourceInfo(), Record);
 456   Writer.AddSourceLocation(D->getLocEnd(), Record);
 457   Record.push_back(D->param_size());
 458   for (ObjCMethodDecl::param_iterator P = D->param_begin(),
 459                                    PEnd = D->param_end(); P != PEnd; ++P)
 460     Writer.AddDeclRef(*P, Record);
 461
 462   Record.push_back(D->SelLocsKind);
 463   unsigned NumStoredSelLocs = D->getNumStoredSelLocs();
 464   SourceLocation *SelLocs = D->getStoredSelLocs();
 465   Record.push_back(NumStoredSelLocs);
 466   for (unsigned i = 0; i != NumStoredSelLocs; ++i)
 467     Writer.AddSourceLocation(SelLocs[i], Record);
 468
 469   Code = serialization::DECL_OBJC_METHOD;
 470 }
 471
 472 void ASTDeclWriter::VisitObjCContainerDecl(ObjCContainerDecl *D) {
 473   VisitNamedDecl(D);
 474   Writer.AddSourceLocation(D->getAtStartLoc(), Record);
 475   Writer.AddSourceRange(D->getAtEndRange(), Record);
 476   // Abstract class (no need to define a stable serialization::DECL code).
 477 }
 478
 479 void ASTDeclWriter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *D) {
 480   VisitRedeclarable(D);
 481   VisitObjCContainerDecl(D);
 482   Writer.AddTypeRef(QualType(D->getTypeForDecl(), 0), Record);
 483
 484   Record.push_back(D->isThisDeclarationADefinition());
 485   if (D->isThisDeclarationADefinition()) {
 486     // Write the DefinitionData
 487     ObjCInterfaceDecl::DefinitionData &Data = D->data();
 488
 489     Writer.AddDeclRef(D->getSuperClass(), Record);
 490     Writer.AddSourceLocation(D->getSuperClassLoc(), Record);
 491     Writer.AddSourceLocation(D->getEndOfDefinitionLoc(), Record);
 492
 493     // Write out the protocols that are directly referenced by the @interface.
 494     Record.push_back(Data.ReferencedProtocols.size());
 495     for (ObjCInterfaceDecl::protocol_iterator P = D->protocol_begin(),
 496                                            PEnd = D->protocol_end();
 497          P != PEnd; ++P)
 498       Writer.AddDeclRef(*P, Record);
 499     for (ObjCInterfaceDecl::protocol_loc_iterator PL = D->protocol_loc_begin(),
 500          PLEnd = D->protocol_loc_end();
 501          PL != PLEnd; ++PL)
 502       Writer.AddSourceLocation(*PL, Record);
 503
 504     // Write out the protocols that are transitively referenced.
 505     Record.push_back(Data.AllReferencedProtocols.size());
 506     for (ObjCList<ObjCProtocolDecl>::iterator
 507               P = Data.AllReferencedProtocols.begin(),
 508            PEnd = Data.AllReferencedProtocols.end();
 509          P != PEnd; ++P)
 510       Writer.AddDeclRef(*P, Record);
 511
 512
 513     if (ObjCCategoryDecl *Cat = D->getCategoryListRaw()) {
 514       // Ensure that we write out the set of categories for this class.
 515       Writer.ObjCClassesWithCategories.insert(D);
 516
 517       // Make sure that the categories get serialized.
 518       for (; Cat; Cat = Cat->getNextClassCategoryRaw())
 519         (void)Writer.GetDeclRef(Cat);
 520     }
 521   }
 522
 523   Code = serialization::DECL_OBJC_INTERFACE;
 524 }
 525
 526 void ASTDeclWriter::VisitObjCIvarDecl(ObjCIvarDecl *D) {
 527   VisitFieldDecl(D);
 528   // FIXME: stable encoding for @public/@private/@protected/@package
 529   Record.push_back(D->getAccessControl());
 530   Record.push_back(D->getSynthesize());
 531   Record.push_back(D->getBackingIvarReferencedInAccessor());
 532
 533   if (!D->hasAttrs() &&
 534       !D->isImplicit() &&
 535       !D->isUsed(false) &&
 536       !D->isInvalidDecl() &&
 537       !D->isReferenced() &&
 538       !D->isModulePrivate() &&
 539       !D->getBitWidth() &&
 540       !D->hasExtInfo() &&
 541       D->getDeclName())
 542     AbbrevToUse = Writer.getDeclObjCIvarAbbrev();
 543
 544   Code = serialization::DECL_OBJC_IVAR;
 545 }
 546
 547 void ASTDeclWriter::VisitObjCProtocolDecl(ObjCProtocolDecl *D) {
 548   VisitRedeclarable(D);
 549   VisitObjCContainerDecl(D);
 550
 551   Record.push_back(D->isThisDeclarationADefinition());
 552   if (D->isThisDeclarationADefinition()) {
 553     Record.push_back(D->protocol_size());
 554     for (ObjCProtocolDecl::protocol_iterator
 555          I = D->protocol_begin(), IEnd = D->protocol_end(); I != IEnd; ++I)
 556       Writer.AddDeclRef(*I, Record);
 557     for (ObjCProtocolDecl::protocol_loc_iterator PL = D->protocol_loc_begin(),
 558            PLEnd = D->protocol_loc_end();
 559          PL != PLEnd; ++PL)
 560       Writer.AddSourceLocation(*PL, Record);
 561   }
 562
 563   Code = serialization::DECL_OBJC_PROTOCOL;
 564 }
 565
 566 void ASTDeclWriter::VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D) {
 567   VisitFieldDecl(D);
 568   Code = serialization::DECL_OBJC_AT_DEFS_FIELD;
 569 }
 570
 571 void ASTDeclWriter::VisitObjCCategoryDecl(ObjCCategoryDecl *D) {
 572   VisitObjCContainerDecl(D);
 573   Writer.AddSourceLocation(D->getCategoryNameLoc(), Record);
 574   Writer.AddSourceLocation(D->getIvarLBraceLoc(), Record);
 575   Writer.AddSourceLocation(D->getIvarRBraceLoc(), Record);
 576   Writer.AddDeclRef(D->getClassInterface(), Record);
 577   Record.push_back(D->protocol_size());
 578   for (ObjCCategoryDecl::protocol_iterator
 579        I = D->protocol_begin(), IEnd = D->protocol_end(); I != IEnd; ++I)
 580     Writer.AddDeclRef(*I, Record);
 581   for (ObjCCategoryDecl::protocol_loc_iterator
 582          PL = D->protocol_loc_begin(), PLEnd = D->protocol_loc_end();
 583        PL != PLEnd; ++PL)
 584     Writer.AddSourceLocation(*PL, Record);
 585   Code = serialization::DECL_OBJC_CATEGORY;
 586 }
 587
 588 void ASTDeclWriter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D) {
 589   VisitNamedDecl(D);
 590   Writer.AddDeclRef(D->getClassInterface(), Record);
 591   Code = serialization::DECL_OBJC_COMPATIBLE_ALIAS;
 592 }
 593
 594 void ASTDeclWriter::VisitObjCPropertyDecl(ObjCPropertyDecl *D) {
 595   VisitNamedDecl(D);
 596   Writer.AddSourceLocation(D->getAtLoc(), Record);
 597   Writer.AddSourceLocation(D->getLParenLoc(), Record);
 598   Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record);
 599   // FIXME: stable encoding
 600   Record.push_back((unsigned)D->getPropertyAttributes());
 601   Record.push_back((unsigned)D->getPropertyAttributesAsWritten());
 602   // FIXME: stable encoding
 603   Record.push_back((unsigned)D->getPropertyImplementation());
 604   Writer.AddDeclarationName(D->getGetterName(), Record);
 605   Writer.AddDeclarationName(D->getSetterName(), Record);
 606   Writer.AddDeclRef(D->getGetterMethodDecl(), Record);
 607   Writer.AddDeclRef(D->getSetterMethodDecl(), Record);
 608   Writer.AddDeclRef(D->getPropertyIvarDecl(), Record);
 609   Code = serialization::DECL_OBJC_PROPERTY;
 610 }
 611
 612 void ASTDeclWriter::VisitObjCImplDecl(ObjCImplDecl *D) {
 613   VisitObjCContainerDecl(D);
 614   Writer.AddDeclRef(D->getClassInterface(), Record);
 615   // Abstract class (no need to define a stable serialization::DECL code).
 616 }
 617
 618 void ASTDeclWriter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D) {
 619   VisitObjCImplDecl(D);
 620   Writer.AddIdentifierRef(D->getIdentifier(), Record);
 621   Writer.AddSourceLocation(D->getCategoryNameLoc(), Record);
 622   Code = serialization::DECL_OBJC_CATEGORY_IMPL;
 623 }
 624
 625 void ASTDeclWriter::VisitObjCImplementationDecl(ObjCImplementationDecl *D) {
 626   VisitObjCImplDecl(D);
 627   Writer.AddDeclRef(D->getSuperClass(), Record);
 628   Writer.AddSourceLocation(D->getSuperClassLoc(), Record);
 629   Writer.AddSourceLocation(D->getIvarLBraceLoc(), Record);
 630   Writer.AddSourceLocation(D->getIvarRBraceLoc(), Record);
 631   Record.push_back(D->hasNonZeroConstructors());
 632   Record.push_back(D->hasDestructors());
 633   Writer.AddCXXCtorInitializers(D->IvarInitializers, D->NumIvarInitializers,
 634                                 Record);
 635   Code = serialization::DECL_OBJC_IMPLEMENTATION;
 636 }
 637
 638 void ASTDeclWriter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D) {
 639   VisitDecl(D);
 640   Writer.AddSourceLocation(D->getLocStart(), Record);
 641   Writer.AddDeclRef(D->getPropertyDecl(), Record);
 642   Writer.AddDeclRef(D->getPropertyIvarDecl(), Record);
 643   Writer.AddSourceLocation(D->getPropertyIvarDeclLoc(), Record);
 644   Writer.AddStmt(D->getGetterCXXConstructor());
 645   Writer.AddStmt(D->getSetterCXXAssignment());
 646   Code = serialization::DECL_OBJC_PROPERTY_IMPL;
 647 }
 648
 649 void ASTDeclWriter::VisitFieldDecl(FieldDecl *D) {
 650   VisitDeclaratorDecl(D);
 651   Record.push_back(D->isMutable());
 652   if (D->InitializerOrBitWidth.getInt() != ICIS_NoInit ||
 653       D->InitializerOrBitWidth.getPointer()) {
 654     Record.push_back(D->InitializerOrBitWidth.getInt() + 1);
 655     Writer.AddStmt(D->InitializerOrBitWidth.getPointer());
 656   } else {
 657     Record.push_back(0);
 658   }
 659   if (!D->getDeclName())
 660     Writer.AddDeclRef(Context.getInstantiatedFromUnnamedFieldDecl(D), Record);
 661
 662   if (!D->hasAttrs() &&
 663       !D->isImplicit() &&
 664       !D->isUsed(false) &&
 665       !D->isInvalidDecl() &&
 666       !D->isReferenced() &&
 667       !D->isTopLevelDeclInObjCContainer() &&
 668       !D->isModulePrivate() &&
 669       !D->getBitWidth() &&
 670       !D->hasInClassInitializer() &&
 671       !D->hasExtInfo() &&
 672       !ObjCIvarDecl::classofKind(D->getKind()) &&
 673       !ObjCAtDefsFieldDecl::classofKind(D->getKind()) &&
 674       D->getDeclName())
 675     AbbrevToUse = Writer.getDeclFieldAbbrev();
 676
 677   Code = serialization::DECL_FIELD;
 678 }
 679
 680 void ASTDeclWriter::VisitMSPropertyDecl(MSPropertyDecl *D) {
 681   VisitDeclaratorDecl(D);
 682   Writer.AddIdentifierRef(D->getGetterId(), Record);
 683   Writer.AddIdentifierRef(D->getSetterId(), Record);
 684   Code = serialization::DECL_MS_PROPERTY;
 685 }
 686
 687 void ASTDeclWriter::VisitIndirectFieldDecl(IndirectFieldDecl *D) {
 688   VisitValueDecl(D);
 689   Record.push_back(D->getChainingSize());
 690
 691   for (IndirectFieldDecl::chain_iterator
 692        P = D->chain_begin(),
 693        PEnd = D->chain_end(); P != PEnd; ++P)
 694     Writer.AddDeclRef(*P, Record);
 695   Code = serialization::DECL_INDIRECTFIELD;
 696 }
 697
 698 void ASTDeclWriter::VisitVarDecl(VarDecl *D) {
 699   VisitRedeclarable(D);
 700   VisitDeclaratorDecl(D);
 701   Record.push_back(D->getStorageClass());
 702   Record.push_back(D->getTSCSpec());
 703   Record.push_back(D->getInitStyle());
 704   Record.push_back(D->isExceptionVariable());
 705   Record.push_back(D->isNRVOVariable());
 706   Record.push_back(D->isCXXForRangeDecl());
 707   Record.push_back(D->isARCPseudoStrong());
 708   Record.push_back(D->isConstexpr());
 709   Record.push_back(D->isInitCapture());
 710   Record.push_back(D->isPreviousDeclInSameBlockScope());
 711   Record.push_back(D->getLinkageInternal());
 712
 713   if (D->getInit()) {
 714     Record.push_back(!D->isInitKnownICE() ? 1 : (D->isInitICE() ? 3 : 2));
 715     Writer.AddStmt(D->getInit());
 716   } else {
 717     Record.push_back(0);
 718   }
 719
 720   enum {
 721     VarNotTemplate = 0, VarTemplate, StaticDataMemberSpecialization
 722   };
 723   if (VarTemplateDecl *TemplD = D->getDescribedVarTemplate()) {
 724     Record.push_back(VarTemplate);
 725     Writer.AddDeclRef(TemplD, Record);
 726   } else if (MemberSpecializationInfo *SpecInfo
 727                = D->getMemberSpecializationInfo()) {
 728     Record.push_back(StaticDataMemberSpecialization);
 729     Writer.AddDeclRef(SpecInfo->getInstantiatedFrom(), Record);
 730     Record.push_back(SpecInfo->getTemplateSpecializationKind());
 731     Writer.AddSourceLocation(SpecInfo->getPointOfInstantiation(), Record);
 732   } else {
 733     Record.push_back(VarNotTemplate);
 734   }
 735
 736   if (!D->hasAttrs() &&
 737       !D->isImplicit() &&
 738       !D->isUsed(false) &&
 739       !D->isInvalidDecl() &&
 740       !D->isReferenced() &&
 741       !D->isTopLevelDeclInObjCContainer() &&
 742       D->getAccess() == AS_none &&
 743       !D->isModulePrivate() &&
 744       D->getDeclName().getNameKind() == DeclarationName::Identifier &&
 745       !D->hasExtInfo() &&
 746       D->getFirstDecl() == D->getMostRecentDecl() &&
 747       D->getInitStyle() == VarDecl::CInit &&
 748       D->getInit() == 0 &&
 749       !isa<ParmVarDecl>(D) &&
 750       !isa<VarTemplateSpecializationDecl>(D) &&
 751       !D->isConstexpr() &&
 752       !D->isInitCapture() &&
 753       !D->isPreviousDeclInSameBlockScope() &&
 754       !D->getMemberSpecializationInfo())
 755     AbbrevToUse = Writer.getDeclVarAbbrev();
 756
 757   Code = serialization::DECL_VAR;
 758 }
 759
 760 void ASTDeclWriter::VisitImplicitParamDecl(ImplicitParamDecl *D) {
 761   VisitVarDecl(D);
 762   Code = serialization::DECL_IMPLICIT_PARAM;
 763 }
 764
 765 void ASTDeclWriter::VisitParmVarDecl(ParmVarDecl *D) {
 766   VisitVarDecl(D);
 767   Record.push_back(D->isObjCMethodParameter());
 768   Record.push_back(D->getFunctionScopeDepth());
 769   Record.push_back(D->getFunctionScopeIndex());
 770   Record.push_back(D->getObjCDeclQualifier()); // FIXME: stable encoding
 771   Record.push_back(D->isKNRPromoted());
 772   Record.push_back(D->hasInheritedDefaultArg());
 773   Record.push_back(D->hasUninstantiatedDefaultArg());
 774   if (D->hasUninstantiatedDefaultArg())
 775     Writer.AddStmt(D->getUninstantiatedDefaultArg());
 776   Code = serialization::DECL_PARM_VAR;
 777
 778   assert(!D->isARCPseudoStrong()); // can be true of ImplicitParamDecl
 779
 780   // If the assumptions about the DECL_PARM_VAR abbrev are true, use it.  Here
 781   // we dynamically check for the properties that we optimize for, but don't
 782   // know are true of all PARM_VAR_DECLs.
 783   if (!D->hasAttrs() &&
 784       !D->hasExtInfo() &&
 785       !D->isImplicit() &&
 786       !D->isUsed(false) &&
 787       !D->isInvalidDecl() &&
 788       !D->isReferenced() &&
 789       D->getAccess() == AS_none &&
 790       !D->isModulePrivate() &&
 791       D->getStorageClass() == 0 &&
 792       D->getInitStyle() == VarDecl::CInit && // Can params have anything else?
 793       D->getFunctionScopeDepth() == 0 &&
 794       D->getObjCDeclQualifier() == 0 &&
 795       !D->isKNRPromoted() &&
 796       !D->hasInheritedDefaultArg() &&
 797       D->getInit() == 0 &&
 798       !D->hasUninstantiatedDefaultArg())  // No default expr.
 799     AbbrevToUse = Writer.getDeclParmVarAbbrev();
 800
 801   // Check things we know are true of *every* PARM_VAR_DECL, which is more than
 802   // just us assuming it.
 803   assert(!D->getTSCSpec() && "PARM_VAR_DECL can't use TLS");
 804   assert(D->getAccess() == AS_none && "PARM_VAR_DECL can't be public/private");
 805   assert(!D->isExceptionVariable() && "PARM_VAR_DECL can't be exception var");
 806   assert(D->getPreviousDecl() == 0 && "PARM_VAR_DECL can't be redecl");
 807   assert(!D->isStaticDataMember() &&
 808          "PARM_VAR_DECL can't be static data member");
 809 }
 810
 811 void ASTDeclWriter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
 812   VisitDecl(D);
 813   Writer.AddStmt(D->getAsmString());
 814   Writer.AddSourceLocation(D->getRParenLoc(), Record);
 815   Code = serialization::DECL_FILE_SCOPE_ASM;
 816 }
 817
 818 void ASTDeclWriter::VisitEmptyDecl(EmptyDecl *D) {
 819   VisitDecl(D);
 820   Code = serialization::DECL_EMPTY;
 821 }
 822
 823 void ASTDeclWriter::VisitBlockDecl(BlockDecl *D) {
 824   VisitDecl(D);
 825   Writer.AddStmt(D->getBody());
 826   Writer.AddTypeSourceInfo(D->getSignatureAsWritten(), Record);
 827   Record.push_back(D->param_size());
 828   for (FunctionDecl::param_iterator P = D->param_begin(), PEnd = D->param_end();
 829        P != PEnd; ++P)
 830     Writer.AddDeclRef(*P, Record);
 831   Record.push_back(D->isVariadic());
 832   Record.push_back(D->blockMissingReturnType());
 833   Record.push_back(D->isConversionFromLambda());
 834   Record.push_back(D->capturesCXXThis());
 835   Record.push_back(D->getNumCaptures());
 836   for (BlockDecl::capture_iterator
 837          i = D->capture_begin(), e = D->capture_end(); i != e; ++i) {
 838     const BlockDecl::Capture &capture = *i;
 839     Writer.AddDeclRef(capture.getVariable(), Record);
 840
 841     unsigned flags = 0;
 842     if (capture.isByRef()) flags |= 1;
 843     if (capture.isNested()) flags |= 2;
 844     if (capture.hasCopyExpr()) flags |= 4;
 845     Record.push_back(flags);
 846
 847     if (capture.hasCopyExpr()) Writer.AddStmt(capture.getCopyExpr());
 848   }
 849
 850   Code = serialization::DECL_BLOCK;
 851 }
 852
 853 void ASTDeclWriter::VisitCapturedDecl(CapturedDecl *CD) {
 854   Record.push_back(CD->getNumParams());
 855   VisitDecl(CD);
 856   // Body is stored by VisitCapturedStmt.
 857   for (unsigned i = 0; i < CD->getNumParams(); ++i)
 858     Writer.AddDeclRef(CD->getParam(i), Record);
 859   Code = serialization::DECL_CAPTURED;
 860 }
 861
 862 void ASTDeclWriter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
 863   VisitDecl(D);
 864   Record.push_back(D->getLanguage());
 865   Writer.AddSourceLocation(D->getExternLoc(), Record);
 866   Writer.AddSourceLocation(D->getRBraceLoc(), Record);
 867   Code = serialization::DECL_LINKAGE_SPEC;
 868 }
 869
 870 void ASTDeclWriter::VisitLabelDecl(LabelDecl *D) {
 871   VisitNamedDecl(D);
 872   Writer.AddSourceLocation(D->getLocStart(), Record);
 873   Code = serialization::DECL_LABEL;
 874 }
 875
 876
 877 void ASTDeclWriter::VisitNamespaceDecl(NamespaceDecl *D) {
 878   VisitRedeclarable(D);
 879   VisitNamedDecl(D);
 880   Record.push_back(D->isInline());
 881   Writer.AddSourceLocation(D->getLocStart(), Record);
 882   Writer.AddSourceLocation(D->getRBraceLoc(), Record);
 883
 884   if (D->isOriginalNamespace())
 885     Writer.AddDeclRef(D->getAnonymousNamespace(), Record);
 886   Code = serialization::DECL_NAMESPACE;
 887
 888   if (Writer.hasChain() && !D->isOriginalNamespace() &&
 889       D->getOriginalNamespace()->isFromASTFile()) {
 890     NamespaceDecl *NS = D->getOriginalNamespace();
 891     Writer.AddUpdatedDeclContext(NS);
 892
 893     // Make sure all visible decls are written. They will be recorded later.
 894     if (StoredDeclsMap *Map = NS->buildLookup()) {
 895       for (StoredDeclsMap::iterator D = Map->begin(), DEnd = Map->end();
 896            D != DEnd; ++D) {
 897         DeclContext::lookup_result R = D->second.getLookupResult();
 898         for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E;
 899              ++I)
 900           Writer.GetDeclRef(*I);
 901       }
 902     }
 903   }
 904
 905   if (Writer.hasChain() && D->isAnonymousNamespace() &&
 906       D == D->getMostRecentDecl()) {
 907     // This is a most recent reopening of the anonymous namespace. If its parent
 908     // is in a previous PCH (or is the TU), mark that parent for update, because
 909     // the original namespace always points to the latest re-opening of its
 910     // anonymous namespace.
 911     Decl *Parent = cast<Decl>(
 912         D->getParent()->getRedeclContext()->getPrimaryContext());
 913     if (Parent->isFromASTFile() || isa<TranslationUnitDecl>(Parent)) {
 914       ASTWriter::UpdateRecord &Record = Writer.DeclUpdates[Parent];
 915       Record.push_back(UPD_CXX_ADDED_ANONYMOUS_NAMESPACE);
 916       Writer.AddDeclRef(D, Record);
 917     }
 918   }
 919 }
 920
 921 void ASTDeclWriter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
 922   VisitNamedDecl(D);
 923   Writer.AddSourceLocation(D->getNamespaceLoc(), Record);
 924   Writer.AddSourceLocation(D->getTargetNameLoc(), Record);
 925   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
 926   Writer.AddDeclRef(D->getNamespace(), Record);
 927   Code = serialization::DECL_NAMESPACE_ALIAS;
 928 }
 929
 930 void ASTDeclWriter::VisitUsingDecl(UsingDecl *D) {
 931   VisitNamedDecl(D);
 932   Writer.AddSourceLocation(D->getUsingLoc(), Record);
 933   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
 934   Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
 935   Writer.AddDeclRef(D->FirstUsingShadow.getPointer(), Record);
 936   Record.push_back(D->hasTypename());
 937   Writer.AddDeclRef(Context.getInstantiatedFromUsingDecl(D), Record);
 938   Code = serialization::DECL_USING;
 939 }
 940
 941 void ASTDeclWriter::VisitUsingShadowDecl(UsingShadowDecl *D) {
 942   VisitRedeclarable(D);
 943   VisitNamedDecl(D);
 944   Writer.AddDeclRef(D->getTargetDecl(), Record);
 945   Writer.AddDeclRef(D->UsingOrNextShadow, Record);
 946   Writer.AddDeclRef(Context.getInstantiatedFromUsingShadowDecl(D), Record);
 947   Code = serialization::DECL_USING_SHADOW;
 948 }
 949
 950 void ASTDeclWriter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
 951   VisitNamedDecl(D);
 952   Writer.AddSourceLocation(D->getUsingLoc(), Record);
 953   Writer.AddSourceLocation(D->getNamespaceKeyLocation(), Record);
 954   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
 955   Writer.AddDeclRef(D->getNominatedNamespace(), Record);
 956   Writer.AddDeclRef(dyn_cast<Decl>(D->getCommonAncestor()), Record);
 957   Code = serialization::DECL_USING_DIRECTIVE;
 958 }
 959
 960 void ASTDeclWriter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
 961   VisitValueDecl(D);
 962   Writer.AddSourceLocation(D->getUsingLoc(), Record);
 963   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
 964   Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
 965   Code = serialization::DECL_UNRESOLVED_USING_VALUE;
 966 }
 967
 968 void ASTDeclWriter::VisitUnresolvedUsingTypenameDecl(
 969                                                UnresolvedUsingTypenameDecl *D) {
 970   VisitTypeDecl(D);
 971   Writer.AddSourceLocation(D->getTypenameLoc(), Record);
 972   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
 973   Code = serialization::DECL_UNRESOLVED_USING_TYPENAME;
 974 }
 975
 976 void ASTDeclWriter::VisitCXXRecordDecl(CXXRecordDecl *D) {
 977   VisitRecordDecl(D);
 978   Record.push_back(D->isThisDeclarationADefinition());
 979   if (D->isThisDeclarationADefinition())
 980     Writer.AddCXXDefinitionData(D, Record);
 981
 982   enum {
 983     CXXRecNotTemplate = 0, CXXRecTemplate, CXXRecMemberSpecialization
 984   };
 985   if (ClassTemplateDecl *TemplD = D->getDescribedClassTemplate()) {
 986     Record.push_back(CXXRecTemplate);
 987     Writer.AddDeclRef(TemplD, Record);
 988   } else if (MemberSpecializationInfo *MSInfo
 989                = D->getMemberSpecializationInfo()) {
 990     Record.push_back(CXXRecMemberSpecialization);
 991     Writer.AddDeclRef(MSInfo->getInstantiatedFrom(), Record);
 992     Record.push_back(MSInfo->getTemplateSpecializationKind());
 993     Writer.AddSourceLocation(MSInfo->getPointOfInstantiation(), Record);
 994   } else {
 995     Record.push_back(CXXRecNotTemplate);
 996   }
 997
 998   // Store (what we currently believe to be) the key function to avoid
 999   // deserializing every method so we can compute it.
1000   if (D->IsCompleteDefinition)
1001     Writer.AddDeclRef(Context.getCurrentKeyFunction(D), Record);
1002
1003   Code = serialization::DECL_CXX_RECORD;
1004 }
1005
1006 void ASTDeclWriter::VisitCXXMethodDecl(CXXMethodDecl *D) {
1007   VisitFunctionDecl(D);
1008   if (D->isCanonicalDecl()) {
1009     Record.push_back(D->size_overridden_methods());
1010     for (CXXMethodDecl::method_iterator
1011            I = D->begin_overridden_methods(), E = D->end_overridden_methods();
1012            I != E; ++I)
1013       Writer.AddDeclRef(*I, Record);
1014   } else {
1015     // We only need to record overridden methods once for the canonical decl.
1016     Record.push_back(0);
1017   }
1018   Code = serialization::DECL_CXX_METHOD;
1019 }
1020
1021 void ASTDeclWriter::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
1022   VisitCXXMethodDecl(D);
1023
1024   Record.push_back(D->IsExplicitSpecified);
1025   Writer.AddCXXCtorInitializers(D->CtorInitializers, D->NumCtorInitializers,
1026                                 Record);
1027
1028   Code = serialization::DECL_CXX_CONSTRUCTOR;
1029 }
1030
1031 void ASTDeclWriter::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
1032   VisitCXXMethodDecl(D);
1033
1034   Writer.AddDeclRef(D->OperatorDelete, Record);
1035
1036   Code = serialization::DECL_CXX_DESTRUCTOR;
1037 }
1038
1039 void ASTDeclWriter::VisitCXXConversionDecl(CXXConversionDecl *D) {
1040   VisitCXXMethodDecl(D);
1041   Record.push_back(D->IsExplicitSpecified);
1042   Code = serialization::DECL_CXX_CONVERSION;
1043 }
1044
1045 void ASTDeclWriter::VisitImportDecl(ImportDecl *D) {
1046   VisitDecl(D);
1047   Record.push_back(Writer.getSubmoduleID(D->getImportedModule()));
1048   ArrayRef<SourceLocation> IdentifierLocs = D->getIdentifierLocs();
1049   Record.push_back(!IdentifierLocs.empty());
1050   if (IdentifierLocs.empty()) {
1051     Writer.AddSourceLocation(D->getLocEnd(), Record);
1052     Record.push_back(1);
1053   } else {
1054     for (unsigned I = 0, N = IdentifierLocs.size(); I != N; ++I)
1055       Writer.AddSourceLocation(IdentifierLocs[I], Record);
1056     Record.push_back(IdentifierLocs.size());
1057   }
1058   // Note: the number of source locations must always be the last element in
1059   // the record.
1060   Code = serialization::DECL_IMPORT;
1061 }
1062
1063 void ASTDeclWriter::VisitAccessSpecDecl(AccessSpecDecl *D) {
1064   VisitDecl(D);
1065   Writer.AddSourceLocation(D->getColonLoc(), Record);
1066   Code = serialization::DECL_ACCESS_SPEC;
1067 }
1068
1069 void ASTDeclWriter::VisitFriendDecl(FriendDecl *D) {
1070   // Record the number of friend type template parameter lists here
1071   // so as to simplify memory allocation during deserialization.
1072   Record.push_back(D->NumTPLists);
1073   VisitDecl(D);
1074   bool hasFriendDecl = D->Friend.is<NamedDecl*>();
1075   Record.push_back(hasFriendDecl);
1076   if (hasFriendDecl)
1077     Writer.AddDeclRef(D->getFriendDecl(), Record);
1078   else
1079     Writer.AddTypeSourceInfo(D->getFriendType(), Record);
1080   for (unsigned i = 0; i < D->NumTPLists; ++i)
1081     Writer.AddTemplateParameterList(D->getFriendTypeTemplateParameterList(i),
1082                                     Record);
1083   Writer.AddDeclRef(D->getNextFriend(), Record);
1084   Record.push_back(D->UnsupportedFriend);
1085   Writer.AddSourceLocation(D->FriendLoc, Record);
1086   Code = serialization::DECL_FRIEND;
1087 }
1088
1089 void ASTDeclWriter::VisitFriendTemplateDecl(FriendTemplateDecl *D) {
1090   VisitDecl(D);
1091   Record.push_back(D->getNumTemplateParameters());
1092   for (unsigned i = 0, e = D->getNumTemplateParameters(); i != e; ++i)
1093     Writer.AddTemplateParameterList(D->getTemplateParameterList(i), Record);
1094   Record.push_back(D->getFriendDecl() != 0);
1095   if (D->getFriendDecl())
1096     Writer.AddDeclRef(D->getFriendDecl(), Record);
1097   else
1098     Writer.AddTypeSourceInfo(D->getFriendType(), Record);
1099   Writer.AddSourceLocation(D->getFriendLoc(), Record);
1100   Code = serialization::DECL_FRIEND_TEMPLATE;
1101 }
1102
1103 void ASTDeclWriter::VisitTemplateDecl(TemplateDecl *D) {
1104   VisitNamedDecl(D);
1105
1106   Writer.AddDeclRef(D->getTemplatedDecl(), Record);
1107   Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1108 }
1109
1110 void ASTDeclWriter::VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D) {
1111   VisitRedeclarable(D);
1112
1113   // Emit data to initialize CommonOrPrev before VisitTemplateDecl so that
1114   // getCommonPtr() can be used while this is still initializing.
1115   if (D->isFirstDecl()) {
1116     // This declaration owns the 'common' pointer, so serialize that data now.
1117     Writer.AddDeclRef(D->getInstantiatedFromMemberTemplate(), Record);
1118     if (D->getInstantiatedFromMemberTemplate())
1119       Record.push_back(D->isMemberSpecialization());
1120   }
1121
1122   VisitTemplateDecl(D);
1123   Record.push_back(D->getIdentifierNamespace());
1124 }
1125
1126 void ASTDeclWriter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1127   VisitRedeclarableTemplateDecl(D);
1128
1129   if (D->isFirstDecl()) {
1130     typedef llvm::FoldingSetVector<ClassTemplateSpecializationDecl> CTSDSetTy;
1131     CTSDSetTy &CTSDSet = D->getSpecializations();
1132     Record.push_back(CTSDSet.size());
1133     for (CTSDSetTy::iterator I=CTSDSet.begin(), E = CTSDSet.end(); I!=E; ++I) {
1134       assert(I->isCanonicalDecl() && "Expected only canonical decls in set");
1135       Writer.AddDeclRef(&*I, Record);
1136     }
1137
1138     typedef llvm::FoldingSetVector<ClassTemplatePartialSpecializationDecl>
1139       CTPSDSetTy;
1140     CTPSDSetTy &CTPSDSet = D->getPartialSpecializations();
1141     Record.push_back(CTPSDSet.size());
1142     for (CTPSDSetTy::iterator I=CTPSDSet.begin(), E=CTPSDSet.end(); I!=E; ++I) {
1143       assert(I->isCanonicalDecl() && "Expected only canonical decls in set");
1144       Writer.AddDeclRef(&*I, Record);
1145     }
1146
1147     Writer.AddTypeRef(D->getCommonPtr()->InjectedClassNameType, Record);
1148   }
1149   Code = serialization::DECL_CLASS_TEMPLATE;
1150 }
1151
1152 void ASTDeclWriter::VisitClassTemplateSpecializationDecl(
1153                                            ClassTemplateSpecializationDecl *D) {
1154   VisitCXXRecordDecl(D);
1155
1156   llvm::PointerUnion<ClassTemplateDecl *,
1157                      ClassTemplatePartialSpecializationDecl *> InstFrom
1158     = D->getSpecializedTemplateOrPartial();
1159   if (Decl *InstFromD = InstFrom.dyn_cast<ClassTemplateDecl *>()) {
1160     Writer.AddDeclRef(InstFromD, Record);
1161   } else {
1162     Writer.AddDeclRef(InstFrom.get<ClassTemplatePartialSpecializationDecl *>(),
1163                       Record);
1164     Writer.AddTemplateArgumentList(&D->getTemplateInstantiationArgs(), Record);
1165   }
1166
1167   Writer.AddTemplateArgumentList(&D->getTemplateArgs(), Record);
1168   Writer.AddSourceLocation(D->getPointOfInstantiation(), Record);
1169   Record.push_back(D->getSpecializationKind());
1170   Record.push_back(D->isCanonicalDecl());
1171
1172   if (D->isCanonicalDecl()) {
1173     // When reading, we'll add it to the folding set of the following template.
1174     Writer.AddDeclRef(D->getSpecializedTemplate()->getCanonicalDecl(), Record);
1175   }
1176
1177   // Explicit info.
1178   Writer.AddTypeSourceInfo(D->getTypeAsWritten(), Record);
1179   if (D->getTypeAsWritten()) {
1180     Writer.AddSourceLocation(D->getExternLoc(), Record);
1181     Writer.AddSourceLocation(D->getTemplateKeywordLoc(), Record);
1182   }
1183
1184   Code = serialization::DECL_CLASS_TEMPLATE_SPECIALIZATION;
1185 }
1186
1187 void ASTDeclWriter::VisitClassTemplatePartialSpecializationDecl(
1188                                     ClassTemplatePartialSpecializationDecl *D) {
1189   VisitClassTemplateSpecializationDecl(D);
1190
1191   Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1192   Writer.AddASTTemplateArgumentListInfo(D->getTemplateArgsAsWritten(), Record);
1193
1194   // These are read/set from/to the first declaration.
1195   if (D->getPreviousDecl() == 0) {
1196     Writer.AddDeclRef(D->getInstantiatedFromMember(), Record);
1197     Record.push_back(D->isMemberSpecialization());
1198   }
1199
1200   Code = serialization::DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION;
1201 }
1202
1203 void ASTDeclWriter::VisitVarTemplateDecl(VarTemplateDecl *D) {
1204   VisitRedeclarableTemplateDecl(D);
1205
1206   if (D->isFirstDecl()) {
1207     typedef llvm::FoldingSetVector<VarTemplateSpecializationDecl> VTSDSetTy;
1208     VTSDSetTy &VTSDSet = D->getSpecializations();
1209     Record.push_back(VTSDSet.size());
1210     for (VTSDSetTy::iterator I = VTSDSet.begin(), E = VTSDSet.end(); I != E;
1211          ++I) {
1212       assert(I->isCanonicalDecl() && "Expected only canonical decls in set");
1213       Writer.AddDeclRef(&*I, Record);
1214     }
1215
1216     typedef llvm::FoldingSetVector<VarTemplatePartialSpecializationDecl>
1217     VTPSDSetTy;
1218     VTPSDSetTy &VTPSDSet = D->getPartialSpecializations();
1219     Record.push_back(VTPSDSet.size());
1220     for (VTPSDSetTy::iterator I = VTPSDSet.begin(), E = VTPSDSet.end(); I != E;
1221          ++I) {
1222       assert(I->isCanonicalDecl() && "Expected only canonical decls in set");
1223       Writer.AddDeclRef(&*I, Record);
1224     }
1225   }
1226   Code = serialization::DECL_VAR_TEMPLATE;
1227 }
1228
1229 void ASTDeclWriter::VisitVarTemplateSpecializationDecl(
1230     VarTemplateSpecializationDecl *D) {
1231   VisitVarDecl(D);
1232
1233   llvm::PointerUnion<VarTemplateDecl *, VarTemplatePartialSpecializationDecl *>
1234   InstFrom = D->getSpecializedTemplateOrPartial();
1235   if (Decl *InstFromD = InstFrom.dyn_cast<VarTemplateDecl *>()) {
1236     Writer.AddDeclRef(InstFromD, Record);
1237   } else {
1238     Writer.AddDeclRef(InstFrom.get<VarTemplatePartialSpecializationDecl *>(),
1239                       Record);
1240     Writer.AddTemplateArgumentList(&D->getTemplateInstantiationArgs(), Record);
1241   }
1242
1243   // Explicit info.
1244   Writer.AddTypeSourceInfo(D->getTypeAsWritten(), Record);
1245   if (D->getTypeAsWritten()) {
1246     Writer.AddSourceLocation(D->getExternLoc(), Record);
1247     Writer.AddSourceLocation(D->getTemplateKeywordLoc(), Record);
1248   }
1249
1250   Writer.AddTemplateArgumentList(&D->getTemplateArgs(), Record);
1251   Writer.AddSourceLocation(D->getPointOfInstantiation(), Record);
1252   Record.push_back(D->getSpecializationKind());
1253   Record.push_back(D->isCanonicalDecl());
1254
1255   if (D->isCanonicalDecl()) {
1256     // When reading, we'll add it to the folding set of the following template.
1257     Writer.AddDeclRef(D->getSpecializedTemplate()->getCanonicalDecl(), Record);
1258   }
1259
1260   Code = serialization::DECL_VAR_TEMPLATE_SPECIALIZATION;
1261 }
1262
1263 void ASTDeclWriter::VisitVarTemplatePartialSpecializationDecl(
1264     VarTemplatePartialSpecializationDecl *D) {
1265   VisitVarTemplateSpecializationDecl(D);
1266
1267   Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1268   Writer.AddASTTemplateArgumentListInfo(D->getTemplateArgsAsWritten(), Record);
1269
1270   // These are read/set from/to the first declaration.
1271   if (D->getPreviousDecl() == 0) {
1272     Writer.AddDeclRef(D->getInstantiatedFromMember(), Record);
1273     Record.push_back(D->isMemberSpecialization());
1274   }
1275
1276   Code = serialization::DECL_VAR_TEMPLATE_PARTIAL_SPECIALIZATION;
1277 }
1278
1279 void ASTDeclWriter::VisitClassScopeFunctionSpecializationDecl(
1280                                     ClassScopeFunctionSpecializationDecl *D) {
1281   VisitDecl(D);
1282   Writer.AddDeclRef(D->getSpecialization(), Record);
1283   Code = serialization::DECL_CLASS_SCOPE_FUNCTION_SPECIALIZATION;
1284 }
1285
1286
1287 void ASTDeclWriter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1288   VisitRedeclarableTemplateDecl(D);
1289
1290   if (D->isFirstDecl()) {
1291     // This FunctionTemplateDecl owns the CommonPtr; write it.
1292
1293     // Write the function specialization declarations.
1294     Record.push_back(D->getSpecializations().size());
1295     for (llvm::FoldingSetVector<FunctionTemplateSpecializationInfo>::iterator
1296            I = D->getSpecializations().begin(),
1297            E = D->getSpecializations().end()   ; I != E; ++I) {
1298       assert(I->Function->isCanonicalDecl() &&
1299              "Expected only canonical decls in set");
1300       Writer.AddDeclRef(I->Function, Record);
1301     }
1302   }
1303   Code = serialization::DECL_FUNCTION_TEMPLATE;
1304 }
1305
1306 void ASTDeclWriter::VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D) {
1307   VisitTypeDecl(D);
1308
1309   Record.push_back(D->wasDeclaredWithTypename());
1310   Record.push_back(D->defaultArgumentWasInherited());
1311   Writer.AddTypeSourceInfo(D->getDefaultArgumentInfo(), Record);
1312
1313   Code = serialization::DECL_TEMPLATE_TYPE_PARM;
1314 }
1315
1316 void ASTDeclWriter::VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {
1317   // For an expanded parameter pack, record the number of expansion types here
1318   // so that it's easier for deserialization to allocate the right amount of
1319   // memory.
1320   if (D->isExpandedParameterPack())
1321     Record.push_back(D->getNumExpansionTypes());
1322
1323   VisitDeclaratorDecl(D);
1324   // TemplateParmPosition.
1325   Record.push_back(D->getDepth());
1326   Record.push_back(D->getPosition());
1327
1328   if (D->isExpandedParameterPack()) {
1329     for (unsigned I = 0, N = D->getNumExpansionTypes(); I != N; ++I) {
1330       Writer.AddTypeRef(D->getExpansionType(I), Record);
1331       Writer.AddTypeSourceInfo(D->getExpansionTypeSourceInfo(I), Record);
1332     }
1333
1334     Code = serialization::DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK;
1335   } else {
1336     // Rest of NonTypeTemplateParmDecl.
1337     Record.push_back(D->isParameterPack());
1338     Record.push_back(D->getDefaultArgument() != 0);
1339     if (D->getDefaultArgument()) {
1340       Writer.AddStmt(D->getDefaultArgument());
1341       Record.push_back(D->defaultArgumentWasInherited());
1342     }
1343     Code = serialization::DECL_NON_TYPE_TEMPLATE_PARM;
1344   }
1345 }
1346
1347 void ASTDeclWriter::VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D) {
1348   // For an expanded parameter pack, record the number of expansion types here
1349   // so that it's easier for deserialization to allocate the right amount of
1350   // memory.
1351   if (D->isExpandedParameterPack())
1352     Record.push_back(D->getNumExpansionTemplateParameters());
1353
1354   VisitTemplateDecl(D);
1355   // TemplateParmPosition.
1356   Record.push_back(D->getDepth());
1357   Record.push_back(D->getPosition());
1358
1359   if (D->isExpandedParameterPack()) {
1360     for (unsigned I = 0, N = D->getNumExpansionTemplateParameters();
1361          I != N; ++I)
1362       Writer.AddTemplateParameterList(D->getExpansionTemplateParameters(I),
1363                                       Record);
1364     Code = serialization::DECL_EXPANDED_TEMPLATE_TEMPLATE_PARM_PACK;
1365   } else {
1366     // Rest of TemplateTemplateParmDecl.
1367     Writer.AddTemplateArgumentLoc(D->getDefaultArgument(), Record);
1368     Record.push_back(D->defaultArgumentWasInherited());
1369     Record.push_back(D->isParameterPack());
1370     Code = serialization::DECL_TEMPLATE_TEMPLATE_PARM;
1371   }
1372 }
1373
1374 void ASTDeclWriter::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) {
1375   VisitRedeclarableTemplateDecl(D);
1376   Code = serialization::DECL_TYPE_ALIAS_TEMPLATE;
1377 }
1378
1379 void ASTDeclWriter::VisitStaticAssertDecl(StaticAssertDecl *D) {
1380   VisitDecl(D);
1381   Writer.AddStmt(D->getAssertExpr());
1382   Record.push_back(D->isFailed());
1383   Writer.AddStmt(D->getMessage());
1384   Writer.AddSourceLocation(D->getRParenLoc(), Record);
1385   Code = serialization::DECL_STATIC_ASSERT;
1386 }
1387
1388 /// \brief Emit the DeclContext part of a declaration context decl.
1389 ///
1390 /// \param LexicalOffset the offset at which the DECL_CONTEXT_LEXICAL
1391 /// block for this declaration context is stored. May be 0 to indicate
1392 /// that there are no declarations stored within this context.
1393 ///
1394 /// \param VisibleOffset the offset at which the DECL_CONTEXT_VISIBLE
1395 /// block for this declaration context is stored. May be 0 to indicate
1396 /// that there are no declarations visible from this context. Note
1397 /// that this value will not be emitted for non-primary declaration
1398 /// contexts.
1399 void ASTDeclWriter::VisitDeclContext(DeclContext *DC, uint64_t LexicalOffset,
1400                                      uint64_t VisibleOffset) {
1401   Record.push_back(LexicalOffset);
1402   Record.push_back(VisibleOffset);
1403 }
1404
1405 template <typename T>
1406 void ASTDeclWriter::VisitRedeclarable(Redeclarable<T> *D) {
1407   T *First = D->getFirstDecl();
1408   if (First->getMostRecentDecl() != First) {
1409     assert(isRedeclarableDeclKind(static_cast<T *>(D)->getKind()) &&
1410            "Not considered redeclarable?");
1411
1412     // There is more than one declaration of this entity, so we will need to
1413     // write a redeclaration chain.
1414     Writer.AddDeclRef(First, Record);
1415     Writer.Redeclarations.insert(First);
1416
1417     // Make sure that we serialize both the previous and the most-recent
1418     // declarations, which (transitively) ensures that all declarations in the
1419     // chain get serialized.
1420     (void)Writer.GetDeclRef(D->getPreviousDecl());
1421     (void)Writer.GetDeclRef(First->getMostRecentDecl());
1422   } else {
1423     // We use the sentinel value 0 to indicate an only declaration.
1424     Record.push_back(0);
1425   }
1426
1427 }
1428
1429 void ASTDeclWriter::VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D) {
1430   Record.push_back(D->varlist_size());
1431   VisitDecl(D);
1432   for (OMPThreadPrivateDecl::varlist_iterator I = D->varlist_begin(),
1433                                               E = D->varlist_end();
1434        I != E; ++I)
1435     Writer.AddStmt(*I);
1436   Code = serialization::DECL_OMP_THREADPRIVATE;
1437 }
1438
1439 //===----------------------------------------------------------------------===//
1440 // ASTWriter Implementation
1441 //===----------------------------------------------------------------------===//
1442
1443 void ASTWriter::WriteDeclsBlockAbbrevs() {
1444   using namespace llvm;
1445
1446   BitCodeAbbrev *Abv;
1447
1448   // Abbreviation for DECL_FIELD
1449   Abv = new BitCodeAbbrev();
1450   Abv->Add(BitCodeAbbrevOp(serialization::DECL_FIELD));
1451   // Decl
1452   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1453   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1454   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1455   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1456   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1457   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1458   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1459   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1460   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1461   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1462   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1463   // NamedDecl
1464   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1465   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1466   // ValueDecl
1467   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1468   // DeclaratorDecl
1469   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1470   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1471   // FieldDecl
1472   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1473   Abv->Add(BitCodeAbbrevOp(0));                       //getBitWidth
1474   // Type Source Info
1475   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1476   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1477   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1478   DeclFieldAbbrev = Stream.EmitAbbrev(Abv);
1479
1480   // Abbreviation for DECL_OBJC_IVAR
1481   Abv = new BitCodeAbbrev();
1482   Abv->Add(BitCodeAbbrevOp(serialization::DECL_OBJC_IVAR));
1483   // Decl
1484   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1485   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1486   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1487   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1488   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1489   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1490   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1491   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1492   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1493   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1494   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1495   // NamedDecl
1496   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1497   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1498   // ValueDecl
1499   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1500   // DeclaratorDecl
1501   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1502   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1503   // FieldDecl
1504   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1505   Abv->Add(BitCodeAbbrevOp(0));                       //getBitWidth
1506   // ObjC Ivar
1507   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getAccessControl
1508   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getSynthesize
1509   // getBackingIvarReferencedInAccessor
1510   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1511   // Type Source Info
1512   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1513   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1514   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1515   DeclObjCIvarAbbrev = Stream.EmitAbbrev(Abv);
1516
1517   // Abbreviation for DECL_ENUM
1518   Abv = new BitCodeAbbrev();
1519   Abv->Add(BitCodeAbbrevOp(serialization::DECL_ENUM));
1520   // Redeclarable
1521   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1522   // Decl
1523   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1524   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1525   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1526   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1527   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1528   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1529   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1530   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1531   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1532   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1533   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1534   // NamedDecl
1535   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1536   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1537   // TypeDecl
1538   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1539   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1540   // TagDecl
1541   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1542   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1543   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1544   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1545   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1546   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsCompleteDefinitionRequired
1547   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1548   Abv->Add(BitCodeAbbrevOp(0));                         // hasExtInfo
1549   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // TypedefNameAnonDecl
1550   // EnumDecl
1551   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // AddTypeRef
1552   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IntegerType
1553   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getPromotionType
1554   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumPositiveBits
1555   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumNegativeBits
1556   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScoped
1557   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScopedUsingClassTag
1558   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isFixed
1559   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // InstantiatedMembEnum
1560   // DC
1561   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1562   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1563   DeclEnumAbbrev = Stream.EmitAbbrev(Abv);
1564
1565   // Abbreviation for DECL_RECORD
1566   Abv = new BitCodeAbbrev();
1567   Abv->Add(BitCodeAbbrevOp(serialization::DECL_RECORD));
1568   // Redeclarable
1569   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1570   // Decl
1571   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1572   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1573   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1574   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1575   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1576   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1577   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1578   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1579   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1580   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1581   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1582   // NamedDecl
1583   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1584   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1585   // TypeDecl
1586   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1587   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1588   // TagDecl
1589   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1590   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1591   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1592   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1593   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1594   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsCompleteDefinitionRequired
1595   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1596   Abv->Add(BitCodeAbbrevOp(0));                         // hasExtInfo
1597   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // TypedefNameAnonDecl
1598   // RecordDecl
1599   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // FlexibleArrayMember
1600   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // AnonymousStructUnion
1601   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasObjectMember
1602   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasVolatileMember
1603   // DC
1604   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1605   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1606   DeclRecordAbbrev = Stream.EmitAbbrev(Abv);
1607
1608   // Abbreviation for DECL_PARM_VAR
1609   Abv = new BitCodeAbbrev();
1610   Abv->Add(BitCodeAbbrevOp(serialization::DECL_PARM_VAR));
1611   // Redeclarable
1612   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1613   // Decl
1614   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1615   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1616   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1617   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1618   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1619   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1620   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1621   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1622   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1623   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1624   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1625   // NamedDecl
1626   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1627   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1628   // ValueDecl
1629   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1630   // DeclaratorDecl
1631   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1632   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1633   // VarDecl
1634   Abv->Add(BitCodeAbbrevOp(0));                       // StorageClass
1635   Abv->Add(BitCodeAbbrevOp(0));                       // getTSCSpec
1636   Abv->Add(BitCodeAbbrevOp(0));                       // hasCXXDirectInitializer
1637   Abv->Add(BitCodeAbbrevOp(0));                       // isExceptionVariable
1638   Abv->Add(BitCodeAbbrevOp(0));                       // isNRVOVariable
1639   Abv->Add(BitCodeAbbrevOp(0));                       // isCXXForRangeDecl
1640   Abv->Add(BitCodeAbbrevOp(0));                       // isARCPseudoStrong
1641   Abv->Add(BitCodeAbbrevOp(0));                       // isConstexpr
1642   Abv->Add(BitCodeAbbrevOp(0));                       // isInitCapture
1643   Abv->Add(BitCodeAbbrevOp(0));                       // isPrevDeclInSameScope
1644   Abv->Add(BitCodeAbbrevOp(0));                       // Linkage
1645   Abv->Add(BitCodeAbbrevOp(0));                       // HasInit
1646   Abv->Add(BitCodeAbbrevOp(0));                   // HasMemberSpecializationInfo
1647   // ParmVarDecl
1648   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsObjCMethodParameter
1649   Abv->Add(BitCodeAbbrevOp(0));                       // ScopeDepth
1650   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ScopeIndex
1651   Abv->Add(BitCodeAbbrevOp(0));                       // ObjCDeclQualifier
1652   Abv->Add(BitCodeAbbrevOp(0));                       // KNRPromoted
1653   Abv->Add(BitCodeAbbrevOp(0));                       // HasInheritedDefaultArg
1654   Abv->Add(BitCodeAbbrevOp(0));                   // HasUninstantiatedDefaultArg
1655   // Type Source Info
1656   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1657   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1658   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1659   DeclParmVarAbbrev = Stream.EmitAbbrev(Abv);
1660
1661   // Abbreviation for DECL_TYPEDEF
1662   Abv = new BitCodeAbbrev();
1663   Abv->Add(BitCodeAbbrevOp(serialization::DECL_TYPEDEF));
1664   // Redeclarable
1665   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1666   // Decl
1667   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1668   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1669   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1670   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1671   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1672   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1673   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1674   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1675   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1676   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1677   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1678   // NamedDecl
1679   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1680   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1681   // TypeDecl
1682   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1683   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1684   // TypedefDecl
1685   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1686   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1687   DeclTypedefAbbrev = Stream.EmitAbbrev(Abv);
1688
1689   // Abbreviation for DECL_VAR
1690   Abv = new BitCodeAbbrev();
1691   Abv->Add(BitCodeAbbrevOp(serialization::DECL_VAR));
1692   // Redeclarable
1693   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1694   // Decl
1695   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1696   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1697   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1698   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1699   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1700   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1701   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1702   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1703   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1704   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1705   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1706   // NamedDecl
1707   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1708   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1709   // ValueDecl
1710   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1711   // DeclaratorDecl
1712   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1713   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1714   // VarDecl
1715   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // StorageClass
1716   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // getTSCSpec
1717   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // CXXDirectInitializer
1718   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isExceptionVariable
1719   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isNRVOVariable
1720   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCXXForRangeDecl
1721   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isARCPseudoStrong
1722   Abv->Add(BitCodeAbbrevOp(0));                         // isConstexpr
1723   Abv->Add(BitCodeAbbrevOp(0));                         // isInitCapture
1724   Abv->Add(BitCodeAbbrevOp(0));                         // isPrevDeclInSameScope
1725   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Linkage
1726   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // HasInit
1727   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // HasMemberSpecInfo
1728   // Type Source Info
1729   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1730   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1731   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1732   DeclVarAbbrev = Stream.EmitAbbrev(Abv);
1733
1734   // Abbreviation for EXPR_DECL_REF
1735   Abv = new BitCodeAbbrev();
1736   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_DECL_REF));
1737   //Stmt
1738   //Expr
1739   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1740   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
1741   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
1742   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
1743   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
1744   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
1745   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
1746   //DeclRefExpr
1747   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HasQualifier
1748   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //GetDeclFound
1749   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ExplicitTemplateArgs
1750   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HadMultipleCandidates
1751   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //RefersToEnclosingLocal
1752   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclRef
1753   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1754   DeclRefExprAbbrev = Stream.EmitAbbrev(Abv);
1755
1756   // Abbreviation for EXPR_INTEGER_LITERAL
1757   Abv = new BitCodeAbbrev();
1758   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_INTEGER_LITERAL));
1759   //Stmt
1760   //Expr
1761   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1762   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
1763   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
1764   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
1765   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
1766   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
1767   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
1768   //Integer Literal
1769   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1770   Abv->Add(BitCodeAbbrevOp(32));                      // Bit Width
1771   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Value
1772   IntegerLiteralAbbrev = Stream.EmitAbbrev(Abv);
1773
1774   // Abbreviation for EXPR_CHARACTER_LITERAL
1775   Abv = new BitCodeAbbrev();
1776   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_CHARACTER_LITERAL));
1777   //Stmt
1778   //Expr
1779   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1780   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
1781   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
1782   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
1783   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
1784   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
1785   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
1786   //Character Literal
1787   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getValue
1788   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1789   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // getKind
1790   CharacterLiteralAbbrev = Stream.EmitAbbrev(Abv);
1791
1792   Abv = new BitCodeAbbrev();
1793   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_LEXICAL));
1794   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1795   DeclContextLexicalAbbrev = Stream.EmitAbbrev(Abv);
1796
1797   Abv = new BitCodeAbbrev();
1798   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_VISIBLE));
1799   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1800   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1801   DeclContextVisibleLookupAbbrev = Stream.EmitAbbrev(Abv);
1802 }
1803
1804 /// isRequiredDecl - Check if this is a "required" Decl, which must be seen by
1805 /// consumers of the AST.
1806 ///
1807 /// Such decls will always be deserialized from the AST file, so we would like
1808 /// this to be as restrictive as possible. Currently the predicate is driven by
1809 /// code generation requirements, if other clients have a different notion of
1810 /// what is "required" then we may have to consider an alternate scheme where
1811 /// clients can iterate over the top-level decls and get information on them,
1812 /// without necessary deserializing them. We could explicitly require such
1813 /// clients to use a separate API call to "realize" the decl. This should be
1814 /// relatively painless since they would presumably only do it for top-level
1815 /// decls.
1816 static bool isRequiredDecl(const Decl *D, ASTContext &Context) {
1817   // An ObjCMethodDecl is never considered as "required" because its
1818   // implementation container always is.
1819
1820   // File scoped assembly or obj-c implementation must be seen.
1821   if (isa<FileScopeAsmDecl>(D) || isa<ObjCImplDecl>(D))
1822     return true;
1823
1824   return Context.DeclMustBeEmitted(D);
1825 }
1826
1827 void ASTWriter::WriteDecl(ASTContext &Context, Decl *D) {
1828   // Switch case IDs are per Decl.
1829   ClearSwitchCaseIDs();
1830
1831   RecordData Record;
1832   ASTDeclWriter W(*this, Context, Record);
1833
1834   // Determine the ID for this declaration.
1835   serialization::DeclID ID;
1836   if (D->isFromASTFile())
1837     ID = getDeclID(D);
1838   else {
1839     serialization::DeclID &IDR = DeclIDs[D];
1840     if (IDR == 0)
1841       IDR = NextDeclID++;
1842
1843     ID= IDR;
1844   }
1845
1846   bool isReplacingADecl = ID < FirstDeclID;
1847
1848   // If this declaration is also a DeclContext, write blocks for the
1849   // declarations that lexically stored inside its context and those
1850   // declarations that are visible from its context. These blocks
1851   // are written before the declaration itself so that we can put
1852   // their offsets into the record for the declaration.
1853   uint64_t LexicalOffset = 0;
1854   uint64_t VisibleOffset = 0;
1855   DeclContext *DC = dyn_cast<DeclContext>(D);
1856   if (DC) {
1857     if (isReplacingADecl) {
1858       // It is replacing a decl from a chained PCH; make sure that the
1859       // DeclContext is fully loaded.
1860       if (DC->hasExternalLexicalStorage())
1861         DC->LoadLexicalDeclsFromExternalStorage();
1862       if (DC->hasExternalVisibleStorage())
1863         Chain->completeVisibleDeclsMap(DC);
1864     }
1865     LexicalOffset = WriteDeclContextLexicalBlock(Context, DC);
1866     VisibleOffset = WriteDeclContextVisibleBlock(Context, DC);
1867   }
1868
1869   if (isReplacingADecl) {
1870     // We're replacing a decl in a previous file.
1871     ReplacedDecls.push_back(ReplacedDeclInfo(ID, Stream.GetCurrentBitNo(),
1872                                              D->getLocation()));
1873   } else {
1874     unsigned Index = ID - FirstDeclID;
1875
1876     // Record the offset for this declaration
1877     SourceLocation Loc = D->getLocation();
1878     if (DeclOffsets.size() == Index)
1879       DeclOffsets.push_back(DeclOffset(Loc, Stream.GetCurrentBitNo()));
1880     else if (DeclOffsets.size() < Index) {
1881       DeclOffsets.resize(Index+1);
1882       DeclOffsets[Index].setLocation(Loc);
1883       DeclOffsets[Index].BitOffset = Stream.GetCurrentBitNo();
1884     }
1885
1886     SourceManager &SM = Context.getSourceManager();
1887     if (Loc.isValid() && SM.isLocalSourceLocation(Loc))
1888       associateDeclWithFile(D, ID);
1889   }
1890
1891   // Build and emit a record for this declaration
1892   Record.clear();
1893   W.Code = (serialization::DeclCode)0;
1894   W.AbbrevToUse = 0;
1895   W.Visit(D);
1896   if (DC) W.VisitDeclContext(DC, LexicalOffset, VisibleOffset);
1897
1898   if (!W.Code)
1899     llvm::report_fatal_error(StringRef("unexpected declaration kind '") +
1900                             D->getDeclKindName() + "'");
1901   Stream.EmitRecord(W.Code, Record, W.AbbrevToUse);
1902
1903   // Flush any expressions that were written as part of this declaration.
1904   FlushStmts();
1905
1906   // Flush C++ base specifiers, if there are any.
1907   FlushCXXBaseSpecifiers();
1908
1909   // Note "external" declarations so that we can add them to a record in the
1910   // AST file later.
1911   //
1912   // FIXME: This should be renamed, the predicate is much more complicated.
1913   if (isRequiredDecl(D, Context))
1914     ExternalDefinitions.push_back(ID);
1915 }