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