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 VisitObjCTypeParamDecl(ObjCTypeParamDecl *D);
 121     void VisitObjCContainerDecl(ObjCContainerDecl *D);
 122     void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
 123     void VisitObjCIvarDecl(ObjCIvarDecl *D);
 124     void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
 125     void VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D);
 126     void VisitObjCCategoryDecl(ObjCCategoryDecl *D);
 127     void VisitObjCImplDecl(ObjCImplDecl *D);
 128     void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
 129     void VisitObjCImplementationDecl(ObjCImplementationDecl *D);
 130     void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D);
 131     void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
 132     void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
 133     void VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D);
 134
 135     /// Add an Objective-C type parameter list to the given record.
 136     void AddObjCTypeParamList(ObjCTypeParamList *typeParams) {
 137       // Empty type parameter list.
 138       if (!typeParams) {
 139         Record.push_back(0);
 140         return;
 141       }
 142
 143       Record.push_back(typeParams->size());
 144       for (auto typeParam : *typeParams) {
 145         Writer.AddDeclRef(typeParam, Record);
 146       }
 147       Writer.AddSourceLocation(typeParams->getLAngleLoc(), Record);
 148       Writer.AddSourceLocation(typeParams->getRAngleLoc(), Record);
 149     }
 150
 151     void AddFunctionDefinition(const FunctionDecl *FD) {
 152       assert(FD->doesThisDeclarationHaveABody());
 153       if (auto *CD = dyn_cast<CXXConstructorDecl>(FD)) {
 154         Record.push_back(CD->NumCtorInitializers);
 155         if (CD->NumCtorInitializers)
 156           Writer.AddCXXCtorInitializersRef(
 157               llvm::makeArrayRef(CD->init_begin(), CD->init_end()), Record);
 158       }
 159       Writer.AddStmt(FD->getBody());
 160     }
 161
 162     /// Add to the record the first declaration from each module file that
 163     /// provides a declaration of D. The intent is to provide a sufficient
 164     /// set such that reloading this set will load all current redeclarations.
 165     void AddFirstDeclFromEachModule(const Decl *D, bool IncludeLocal) {
 166       llvm::MapVector<ModuleFile*, const Decl*> Firsts;
 167       // FIXME: We can skip entries that we know are implied by others.
 168       for (const Decl *R = D->getMostRecentDecl(); R; R = R->getPreviousDecl()) {
 169         if (R->isFromASTFile())
 170           Firsts[Writer.Chain->getOwningModuleFile(R)] = R;
 171         else if (IncludeLocal)
 172           Firsts[nullptr] = R;
 173       }
 174       for (const auto &F : Firsts)
 175         Writer.AddDeclRef(F.second, Record);
 176     }
 177
 178     /// Get the specialization decl from an entry in the specialization list.
 179     template <typename EntryType>
 180     typename RedeclarableTemplateDecl::SpecEntryTraits<EntryType>::DeclType *
 181     getSpecializationDecl(EntryType &T) {
 182       return RedeclarableTemplateDecl::SpecEntryTraits<EntryType>::getDecl(&T);
 183     }
 184
 185     /// Get the list of partial specializations from a template's common ptr.
 186     template<typename T>
 187     decltype(T::PartialSpecializations) &getPartialSpecializations(T *Common) {
 188       return Common->PartialSpecializations;
 189     }
 190     ArrayRef<Decl> getPartialSpecializations(FunctionTemplateDecl::Common *) {
 191       return None;
 192     }
 193
 194     template<typename Decl>
 195     void AddTemplateSpecializations(Decl *D) {
 196       auto *Common = D->getCommonPtr();
 197
 198       // If we have any lazy specializations, and the external AST source is
 199       // our chained AST reader, we can just write out the DeclIDs. Otherwise,
 200       // we need to resolve them to actual declarations.
 201       if (Writer.Chain != Writer.Context->getExternalSource() &&
 202           Common->LazySpecializations) {
 203         D->LoadLazySpecializations();
 204         assert(!Common->LazySpecializations);
 205       }
 206
 207       auto &Specializations = Common->Specializations;
 208       auto &&PartialSpecializations = getPartialSpecializations(Common);
 209       ArrayRef<DeclID> LazySpecializations;
 210       if (auto *LS = Common->LazySpecializations)
 211         LazySpecializations = llvm::makeArrayRef(LS + 1, LS[0]);
 212
 213       // Add a slot to the record for the number of specializations.
 214       unsigned I = Record.size();
 215       Record.push_back(0);
 216
 217       for (auto &Entry : Specializations) {
 218         auto *D = getSpecializationDecl(Entry);
 219         assert(D->isCanonicalDecl() && "non-canonical decl in set");
 220         AddFirstDeclFromEachModule(D, /*IncludeLocal*/true);
 221       }
 222       for (auto &Entry : PartialSpecializations) {
 223         auto *D = getSpecializationDecl(Entry);
 224         assert(D->isCanonicalDecl() && "non-canonical decl in set");
 225         AddFirstDeclFromEachModule(D, /*IncludeLocal*/true);
 226       }
 227       Record.append(LazySpecializations.begin(), LazySpecializations.end());
 228
 229       // Update the size entry we added earlier.
 230       Record[I] = Record.size() - I - 1;
 231     }
 232
 233     /// Ensure that this template specialization is associated with the specified
 234     /// template on reload.
 235     void RegisterTemplateSpecialization(const Decl *Template,
 236                                         const Decl *Specialization) {
 237       Template = Template->getCanonicalDecl();
 238
 239       // If the canonical template is local, we'll write out this specialization
 240       // when we emit it.
 241       // FIXME: We can do the same thing if there is any local declaration of
 242       // the template, to avoid emitting an update record.
 243       if (!Template->isFromASTFile())
 244         return;
 245
 246       // We only need to associate the first local declaration of the
 247       // specialization. The other declarations will get pulled in by it.
 248       if (Writer.getFirstLocalDecl(Specialization) != Specialization)
 249         return;
 250
 251       Writer.DeclUpdates[Template].push_back(ASTWriter::DeclUpdate(
 252           UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION, Specialization));
 253     }
 254   };
 255 }
 256
 257 void ASTDeclWriter::Visit(Decl *D) {
 258   DeclVisitor<ASTDeclWriter>::Visit(D);
 259
 260   // Source locations require array (variable-length) abbreviations.  The
 261   // abbreviation infrastructure requires that arrays are encoded last, so
 262   // we handle it here in the case of those classes derived from DeclaratorDecl
 263   if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)) {
 264     Writer.AddTypeSourceInfo(DD->getTypeSourceInfo(), Record);
 265   }
 266
 267   // Handle FunctionDecl's body here and write it after all other Stmts/Exprs
 268   // have been written. We want it last because we will not read it back when
 269   // retrieving it from the AST, we'll just lazily set the offset.
 270   if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
 271     Record.push_back(FD->doesThisDeclarationHaveABody());
 272     if (FD->doesThisDeclarationHaveABody())
 273       AddFunctionDefinition(FD);
 274   }
 275 }
 276
 277 void ASTDeclWriter::VisitDecl(Decl *D) {
 278   Writer.AddDeclRef(cast_or_null<Decl>(D->getDeclContext()), Record);
 279   if (D->getDeclContext() != D->getLexicalDeclContext())
 280     Writer.AddDeclRef(cast_or_null<Decl>(D->getLexicalDeclContext()), Record);
 281   else
 282     Record.push_back(0);
 283   Record.push_back(D->isInvalidDecl());
 284   Record.push_back(D->hasAttrs());
 285   if (D->hasAttrs())
 286     Writer.WriteAttributes(llvm::makeArrayRef(D->getAttrs().begin(),
 287                                               D->getAttrs().size()), Record);
 288   Record.push_back(D->isImplicit());
 289   Record.push_back(D->isUsed(false));
 290   Record.push_back(D->isReferenced());
 291   Record.push_back(D->isTopLevelDeclInObjCContainer());
 292   Record.push_back(D->getAccess());
 293   Record.push_back(D->isModulePrivate());
 294   Record.push_back(Writer.inferSubmoduleIDFromLocation(D->getLocation()));
 295
 296   // If this declaration injected a name into a context different from its
 297   // lexical context, and that context is an imported namespace, we need to
 298   // update its visible declarations to include this name.
 299   //
 300   // This happens when we instantiate a class with a friend declaration or a
 301   // function with a local extern declaration, for instance.
 302   //
 303   // FIXME: Can we handle this in AddedVisibleDecl instead?
 304   if (D->isOutOfLine()) {
 305     auto *DC = D->getDeclContext();
 306     while (auto *NS = dyn_cast<NamespaceDecl>(DC->getRedeclContext())) {
 307       if (!NS->isFromASTFile())
 308         break;
 309       Writer.UpdatedDeclContexts.insert(NS->getPrimaryContext());
 310       if (!NS->isInlineNamespace())
 311         break;
 312       DC = NS->getParent();
 313     }
 314   }
 315 }
 316
 317 void ASTDeclWriter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
 318   llvm_unreachable("Translation units aren't directly serialized");
 319 }
 320
 321 void ASTDeclWriter::VisitNamedDecl(NamedDecl *D) {
 322   VisitDecl(D);
 323   Writer.AddDeclarationName(D->getDeclName(), Record);
 324   Record.push_back(needsAnonymousDeclarationNumber(D)
 325                        ? Writer.getAnonymousDeclarationNumber(D)
 326                        : 0);
 327 }
 328
 329 void ASTDeclWriter::VisitTypeDecl(TypeDecl *D) {
 330   VisitNamedDecl(D);
 331   Writer.AddSourceLocation(D->getLocStart(), Record);
 332   Writer.AddTypeRef(QualType(D->getTypeForDecl(), 0), Record);
 333 }
 334
 335 void ASTDeclWriter::VisitTypedefNameDecl(TypedefNameDecl *D) {
 336   VisitRedeclarable(D);
 337   VisitTypeDecl(D);
 338   Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record);
 339   Record.push_back(D->isModed());
 340   if (D->isModed())
 341     Writer.AddTypeRef(D->getUnderlyingType(), Record);
 342 }
 343
 344 void ASTDeclWriter::VisitTypedefDecl(TypedefDecl *D) {
 345   VisitTypedefNameDecl(D);
 346   if (D->getDeclContext() == D->getLexicalDeclContext() &&
 347       !D->hasAttrs() &&
 348       !D->isImplicit() &&
 349       D->getFirstDecl() == D->getMostRecentDecl() &&
 350       !D->isInvalidDecl() &&
 351       !D->isTopLevelDeclInObjCContainer() &&
 352       !D->isModulePrivate() &&
 353       !needsAnonymousDeclarationNumber(D) &&
 354       D->getDeclName().getNameKind() == DeclarationName::Identifier)
 355     AbbrevToUse = Writer.getDeclTypedefAbbrev();
 356
 357   Code = serialization::DECL_TYPEDEF;
 358 }
 359
 360 void ASTDeclWriter::VisitTypeAliasDecl(TypeAliasDecl *D) {
 361   VisitTypedefNameDecl(D);
 362   Writer.AddDeclRef(D->getDescribedAliasTemplate(), Record);
 363   Code = serialization::DECL_TYPEALIAS;
 364 }
 365
 366 void ASTDeclWriter::VisitTagDecl(TagDecl *D) {
 367   VisitRedeclarable(D);
 368   VisitTypeDecl(D);
 369   Record.push_back(D->getIdentifierNamespace());
 370   Record.push_back((unsigned)D->getTagKind()); // FIXME: stable encoding
 371   if (!isa<CXXRecordDecl>(D))
 372     Record.push_back(D->isCompleteDefinition());
 373   Record.push_back(D->isEmbeddedInDeclarator());
 374   Record.push_back(D->isFreeStanding());
 375   Record.push_back(D->isCompleteDefinitionRequired());
 376   Writer.AddSourceLocation(D->getRBraceLoc(), Record);
 377
 378   if (D->hasExtInfo()) {
 379     Record.push_back(1);
 380     Writer.AddQualifierInfo(*D->getExtInfo(), Record);
 381   } else if (auto *TD = D->getTypedefNameForAnonDecl()) {
 382     Record.push_back(2);
 383     Writer.AddDeclRef(TD, Record);
 384     Writer.AddIdentifierRef(TD->getDeclName().getAsIdentifierInfo(), Record);
 385   } else {
 386     Record.push_back(0);
 387   }
 388 }
 389
 390 void ASTDeclWriter::VisitEnumDecl(EnumDecl *D) {
 391   VisitTagDecl(D);
 392   Writer.AddTypeSourceInfo(D->getIntegerTypeSourceInfo(), Record);
 393   if (!D->getIntegerTypeSourceInfo())
 394     Writer.AddTypeRef(D->getIntegerType(), Record);
 395   Writer.AddTypeRef(D->getPromotionType(), Record);
 396   Record.push_back(D->getNumPositiveBits());
 397   Record.push_back(D->getNumNegativeBits());
 398   Record.push_back(D->isScoped());
 399   Record.push_back(D->isScopedUsingClassTag());
 400   Record.push_back(D->isFixed());
 401   if (MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo()) {
 402     Writer.AddDeclRef(MemberInfo->getInstantiatedFrom(), Record);
 403     Record.push_back(MemberInfo->getTemplateSpecializationKind());
 404     Writer.AddSourceLocation(MemberInfo->getPointOfInstantiation(), Record);
 405   } else {
 406     Writer.AddDeclRef(nullptr, Record);
 407   }
 408
 409   if (D->getDeclContext() == D->getLexicalDeclContext() &&
 410       !D->hasAttrs() &&
 411       !D->isImplicit() &&
 412       !D->isUsed(false) &&
 413       !D->hasExtInfo() &&
 414       !D->getTypedefNameForAnonDecl() &&
 415       D->getFirstDecl() == D->getMostRecentDecl() &&
 416       !D->isInvalidDecl() &&
 417       !D->isReferenced() &&
 418       !D->isTopLevelDeclInObjCContainer() &&
 419       D->getAccess() == AS_none &&
 420       !D->isModulePrivate() &&
 421       !CXXRecordDecl::classofKind(D->getKind()) &&
 422       !D->getIntegerTypeSourceInfo() &&
 423       !D->getMemberSpecializationInfo() &&
 424       !needsAnonymousDeclarationNumber(D) &&
 425       D->getDeclName().getNameKind() == DeclarationName::Identifier)
 426     AbbrevToUse = Writer.getDeclEnumAbbrev();
 427
 428   Code = serialization::DECL_ENUM;
 429 }
 430
 431 void ASTDeclWriter::VisitRecordDecl(RecordDecl *D) {
 432   VisitTagDecl(D);
 433   Record.push_back(D->hasFlexibleArrayMember());
 434   Record.push_back(D->isAnonymousStructOrUnion());
 435   Record.push_back(D->hasObjectMember());
 436   Record.push_back(D->hasVolatileMember());
 437
 438   if (D->getDeclContext() == D->getLexicalDeclContext() &&
 439       !D->hasAttrs() &&
 440       !D->isImplicit() &&
 441       !D->isUsed(false) &&
 442       !D->hasExtInfo() &&
 443       !D->getTypedefNameForAnonDecl() &&
 444       D->getFirstDecl() == D->getMostRecentDecl() &&
 445       !D->isInvalidDecl() &&
 446       !D->isReferenced() &&
 447       !D->isTopLevelDeclInObjCContainer() &&
 448       D->getAccess() == AS_none &&
 449       !D->isModulePrivate() &&
 450       !CXXRecordDecl::classofKind(D->getKind()) &&
 451       !needsAnonymousDeclarationNumber(D) &&
 452       D->getDeclName().getNameKind() == DeclarationName::Identifier)
 453     AbbrevToUse = Writer.getDeclRecordAbbrev();
 454
 455   Code = serialization::DECL_RECORD;
 456 }
 457
 458 void ASTDeclWriter::VisitValueDecl(ValueDecl *D) {
 459   VisitNamedDecl(D);
 460   Writer.AddTypeRef(D->getType(), Record);
 461 }
 462
 463 void ASTDeclWriter::VisitEnumConstantDecl(EnumConstantDecl *D) {
 464   VisitValueDecl(D);
 465   Record.push_back(D->getInitExpr()? 1 : 0);
 466   if (D->getInitExpr())
 467     Writer.AddStmt(D->getInitExpr());
 468   Writer.AddAPSInt(D->getInitVal(), Record);
 469
 470   Code = serialization::DECL_ENUM_CONSTANT;
 471 }
 472
 473 void ASTDeclWriter::VisitDeclaratorDecl(DeclaratorDecl *D) {
 474   VisitValueDecl(D);
 475   Writer.AddSourceLocation(D->getInnerLocStart(), Record);
 476   Record.push_back(D->hasExtInfo());
 477   if (D->hasExtInfo())
 478     Writer.AddQualifierInfo(*D->getExtInfo(), Record);
 479 }
 480
 481 void ASTDeclWriter::VisitFunctionDecl(FunctionDecl *D) {
 482   VisitRedeclarable(D);
 483   VisitDeclaratorDecl(D);
 484   Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
 485   Record.push_back(D->getIdentifierNamespace());
 486
 487   // FunctionDecl's body is handled last at ASTWriterDecl::Visit,
 488   // after everything else is written.
 489
 490   Record.push_back((int)D->SClass); // FIXME: stable encoding
 491   Record.push_back(D->IsInline);
 492   Record.push_back(D->IsInlineSpecified);
 493   Record.push_back(D->IsVirtualAsWritten);
 494   Record.push_back(D->IsPure);
 495   Record.push_back(D->HasInheritedPrototype);
 496   Record.push_back(D->HasWrittenPrototype);
 497   Record.push_back(D->IsDeleted);
 498   Record.push_back(D->IsTrivial);
 499   Record.push_back(D->IsDefaulted);
 500   Record.push_back(D->IsExplicitlyDefaulted);
 501   Record.push_back(D->HasImplicitReturnZero);
 502   Record.push_back(D->IsConstexpr);
 503   Record.push_back(D->HasSkippedBody);
 504   Record.push_back(D->IsLateTemplateParsed);
 505   Record.push_back(D->getLinkageInternal());
 506   Writer.AddSourceLocation(D->getLocEnd(), Record);
 507
 508   Record.push_back(D->getTemplatedKind());
 509   switch (D->getTemplatedKind()) {
 510   case FunctionDecl::TK_NonTemplate:
 511     break;
 512   case FunctionDecl::TK_FunctionTemplate:
 513     Writer.AddDeclRef(D->getDescribedFunctionTemplate(), Record);
 514     break;
 515   case FunctionDecl::TK_MemberSpecialization: {
 516     MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo();
 517     Writer.AddDeclRef(MemberInfo->getInstantiatedFrom(), Record);
 518     Record.push_back(MemberInfo->getTemplateSpecializationKind());
 519     Writer.AddSourceLocation(MemberInfo->getPointOfInstantiation(), Record);
 520     break;
 521   }
 522   case FunctionDecl::TK_FunctionTemplateSpecialization: {
 523     FunctionTemplateSpecializationInfo *
 524       FTSInfo = D->getTemplateSpecializationInfo();
 525
 526     RegisterTemplateSpecialization(FTSInfo->getTemplate(), D);
 527
 528     Writer.AddDeclRef(FTSInfo->getTemplate(), Record);
 529     Record.push_back(FTSInfo->getTemplateSpecializationKind());
 530
 531     // Template arguments.
 532     Writer.AddTemplateArgumentList(FTSInfo->TemplateArguments, Record);
 533
 534     // Template args as written.
 535     Record.push_back(FTSInfo->TemplateArgumentsAsWritten != nullptr);
 536     if (FTSInfo->TemplateArgumentsAsWritten) {
 537       Record.push_back(FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs);
 538       for (int i=0, e = FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs;
 539              i!=e; ++i)
 540         Writer.AddTemplateArgumentLoc((*FTSInfo->TemplateArgumentsAsWritten)[i],
 541                                       Record);
 542       Writer.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->LAngleLoc,
 543                                Record);
 544       Writer.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->RAngleLoc,
 545                                Record);
 546     }
 547
 548     Writer.AddSourceLocation(FTSInfo->getPointOfInstantiation(), Record);
 549
 550     if (D->isCanonicalDecl()) {
 551       // Write the template that contains the specializations set. We will
 552       // add a FunctionTemplateSpecializationInfo to it when reading.
 553       Writer.AddDeclRef(FTSInfo->getTemplate()->getCanonicalDecl(), Record);
 554     }
 555     break;
 556   }
 557   case FunctionDecl::TK_DependentFunctionTemplateSpecialization: {
 558     DependentFunctionTemplateSpecializationInfo *
 559       DFTSInfo = D->getDependentSpecializationInfo();
 560
 561     // Templates.
 562     Record.push_back(DFTSInfo->getNumTemplates());
 563     for (int i=0, e = DFTSInfo->getNumTemplates(); i != e; ++i)
 564       Writer.AddDeclRef(DFTSInfo->getTemplate(i), Record);
 565
 566     // Templates args.
 567     Record.push_back(DFTSInfo->getNumTemplateArgs());
 568     for (int i=0, e = DFTSInfo->getNumTemplateArgs(); i != e; ++i)
 569       Writer.AddTemplateArgumentLoc(DFTSInfo->getTemplateArg(i), Record);
 570     Writer.AddSourceLocation(DFTSInfo->getLAngleLoc(), Record);
 571     Writer.AddSourceLocation(DFTSInfo->getRAngleLoc(), Record);
 572     break;
 573   }
 574   }
 575
 576   Record.push_back(D->param_size());
 577   for (auto P : D->params())
 578     Writer.AddDeclRef(P, Record);
 579   Code = serialization::DECL_FUNCTION;
 580 }
 581
 582 void ASTDeclWriter::VisitObjCMethodDecl(ObjCMethodDecl *D) {
 583   VisitNamedDecl(D);
 584   // FIXME: convert to LazyStmtPtr?
 585   // Unlike C/C++, method bodies will never be in header files.
 586   bool HasBodyStuff = D->getBody() != nullptr     ||
 587                       D->getSelfDecl() != nullptr || D->getCmdDecl() != nullptr;
 588   Record.push_back(HasBodyStuff);
 589   if (HasBodyStuff) {
 590     Writer.AddStmt(D->getBody());
 591     Writer.AddDeclRef(D->getSelfDecl(), Record);
 592     Writer.AddDeclRef(D->getCmdDecl(), Record);
 593   }
 594   Record.push_back(D->isInstanceMethod());
 595   Record.push_back(D->isVariadic());
 596   Record.push_back(D->isPropertyAccessor());
 597   Record.push_back(D->isDefined());
 598   Record.push_back(D->IsOverriding);
 599   Record.push_back(D->HasSkippedBody);
 600
 601   Record.push_back(D->IsRedeclaration);
 602   Record.push_back(D->HasRedeclaration);
 603   if (D->HasRedeclaration) {
 604     assert(Context.getObjCMethodRedeclaration(D));
 605     Writer.AddDeclRef(Context.getObjCMethodRedeclaration(D), Record);
 606   }
 607
 608   // FIXME: stable encoding for @required/@optional
 609   Record.push_back(D->getImplementationControl());
 610   // FIXME: stable encoding for in/out/inout/bycopy/byref/oneway/nullability
 611   Record.push_back(D->getObjCDeclQualifier());
 612   Record.push_back(D->hasRelatedResultType());
 613   Writer.AddTypeRef(D->getReturnType(), Record);
 614   Writer.AddTypeSourceInfo(D->getReturnTypeSourceInfo(), Record);
 615   Writer.AddSourceLocation(D->getLocEnd(), Record);
 616   Record.push_back(D->param_size());
 617   for (const auto *P : D->params())
 618     Writer.AddDeclRef(P, Record);
 619
 620   Record.push_back(D->SelLocsKind);
 621   unsigned NumStoredSelLocs = D->getNumStoredSelLocs();
 622   SourceLocation *SelLocs = D->getStoredSelLocs();
 623   Record.push_back(NumStoredSelLocs);
 624   for (unsigned i = 0; i != NumStoredSelLocs; ++i)
 625     Writer.AddSourceLocation(SelLocs[i], Record);
 626
 627   Code = serialization::DECL_OBJC_METHOD;
 628 }
 629
 630 void ASTDeclWriter::VisitObjCTypeParamDecl(ObjCTypeParamDecl *D) {
 631   VisitTypedefNameDecl(D);
 632   Record.push_back(D->Variance);
 633   Record.push_back(D->Index);
 634   Writer.AddSourceLocation(D->VarianceLoc, Record);
 635   Writer.AddSourceLocation(D->ColonLoc, Record);
 636
 637   Code = serialization::DECL_OBJC_TYPE_PARAM;
 638 }
 639
 640 void ASTDeclWriter::VisitObjCContainerDecl(ObjCContainerDecl *D) {
 641   VisitNamedDecl(D);
 642   Writer.AddSourceLocation(D->getAtStartLoc(), Record);
 643   Writer.AddSourceRange(D->getAtEndRange(), Record);
 644   // Abstract class (no need to define a stable serialization::DECL code).
 645 }
 646
 647 void ASTDeclWriter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *D) {
 648   VisitRedeclarable(D);
 649   VisitObjCContainerDecl(D);
 650   Writer.AddTypeRef(QualType(D->getTypeForDecl(), 0), Record);
 651   AddObjCTypeParamList(D->TypeParamList);
 652
 653   Record.push_back(D->isThisDeclarationADefinition());
 654   if (D->isThisDeclarationADefinition()) {
 655     // Write the DefinitionData
 656     ObjCInterfaceDecl::DefinitionData &Data = D->data();
 657
 658     Writer.AddTypeSourceInfo(D->getSuperClassTInfo(), Record);
 659     Writer.AddSourceLocation(D->getEndOfDefinitionLoc(), Record);
 660     Record.push_back(Data.HasDesignatedInitializers);
 661
 662     // Write out the protocols that are directly referenced by the @interface.
 663     Record.push_back(Data.ReferencedProtocols.size());
 664     for (const auto *P : D->protocols())
 665       Writer.AddDeclRef(P, Record);
 666     for (const auto &PL : D->protocol_locs())
 667       Writer.AddSourceLocation(PL, Record);
 668
 669     // Write out the protocols that are transitively referenced.
 670     Record.push_back(Data.AllReferencedProtocols.size());
 671     for (ObjCList<ObjCProtocolDecl>::iterator
 672               P = Data.AllReferencedProtocols.begin(),
 673            PEnd = Data.AllReferencedProtocols.end();
 674          P != PEnd; ++P)
 675       Writer.AddDeclRef(*P, Record);
 676
 677
 678     if (ObjCCategoryDecl *Cat = D->getCategoryListRaw()) {
 679       // Ensure that we write out the set of categories for this class.
 680       Writer.ObjCClassesWithCategories.insert(D);
 681
 682       // Make sure that the categories get serialized.
 683       for (; Cat; Cat = Cat->getNextClassCategoryRaw())
 684         (void)Writer.GetDeclRef(Cat);
 685     }
 686   }
 687
 688   Code = serialization::DECL_OBJC_INTERFACE;
 689 }
 690
 691 void ASTDeclWriter::VisitObjCIvarDecl(ObjCIvarDecl *D) {
 692   VisitFieldDecl(D);
 693   // FIXME: stable encoding for @public/@private/@protected/@package
 694   Record.push_back(D->getAccessControl());
 695   Record.push_back(D->getSynthesize());
 696
 697   if (D->getDeclContext() == D->getLexicalDeclContext() &&
 698       !D->hasAttrs() &&
 699       !D->isImplicit() &&
 700       !D->isUsed(false) &&
 701       !D->isInvalidDecl() &&
 702       !D->isReferenced() &&
 703       !D->isModulePrivate() &&
 704       !D->getBitWidth() &&
 705       !D->hasExtInfo() &&
 706       D->getDeclName())
 707     AbbrevToUse = Writer.getDeclObjCIvarAbbrev();
 708
 709   Code = serialization::DECL_OBJC_IVAR;
 710 }
 711
 712 void ASTDeclWriter::VisitObjCProtocolDecl(ObjCProtocolDecl *D) {
 713   VisitRedeclarable(D);
 714   VisitObjCContainerDecl(D);
 715
 716   Record.push_back(D->isThisDeclarationADefinition());
 717   if (D->isThisDeclarationADefinition()) {
 718     Record.push_back(D->protocol_size());
 719     for (const auto *I : D->protocols())
 720       Writer.AddDeclRef(I, Record);
 721     for (const auto &PL : D->protocol_locs())
 722       Writer.AddSourceLocation(PL, Record);
 723   }
 724
 725   Code = serialization::DECL_OBJC_PROTOCOL;
 726 }
 727
 728 void ASTDeclWriter::VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D) {
 729   VisitFieldDecl(D);
 730   Code = serialization::DECL_OBJC_AT_DEFS_FIELD;
 731 }
 732
 733 void ASTDeclWriter::VisitObjCCategoryDecl(ObjCCategoryDecl *D) {
 734   VisitObjCContainerDecl(D);
 735   Writer.AddSourceLocation(D->getCategoryNameLoc(), Record);
 736   Writer.AddSourceLocation(D->getIvarLBraceLoc(), Record);
 737   Writer.AddSourceLocation(D->getIvarRBraceLoc(), Record);
 738   Writer.AddDeclRef(D->getClassInterface(), Record);
 739   AddObjCTypeParamList(D->TypeParamList);
 740   Record.push_back(D->protocol_size());
 741   for (const auto *I : D->protocols())
 742     Writer.AddDeclRef(I, Record);
 743   for (const auto &PL : D->protocol_locs())
 744     Writer.AddSourceLocation(PL, Record);
 745   Code = serialization::DECL_OBJC_CATEGORY;
 746 }
 747
 748 void ASTDeclWriter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D) {
 749   VisitNamedDecl(D);
 750   Writer.AddDeclRef(D->getClassInterface(), Record);
 751   Code = serialization::DECL_OBJC_COMPATIBLE_ALIAS;
 752 }
 753
 754 void ASTDeclWriter::VisitObjCPropertyDecl(ObjCPropertyDecl *D) {
 755   VisitNamedDecl(D);
 756   Writer.AddSourceLocation(D->getAtLoc(), Record);
 757   Writer.AddSourceLocation(D->getLParenLoc(), Record);
 758   Writer.AddTypeRef(D->getType(), Record);
 759   Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record);
 760   // FIXME: stable encoding
 761   Record.push_back((unsigned)D->getPropertyAttributes());
 762   Record.push_back((unsigned)D->getPropertyAttributesAsWritten());
 763   // FIXME: stable encoding
 764   Record.push_back((unsigned)D->getPropertyImplementation());
 765   Writer.AddDeclarationName(D->getGetterName(), Record);
 766   Writer.AddDeclarationName(D->getSetterName(), Record);
 767   Writer.AddDeclRef(D->getGetterMethodDecl(), Record);
 768   Writer.AddDeclRef(D->getSetterMethodDecl(), Record);
 769   Writer.AddDeclRef(D->getPropertyIvarDecl(), Record);
 770   Code = serialization::DECL_OBJC_PROPERTY;
 771 }
 772
 773 void ASTDeclWriter::VisitObjCImplDecl(ObjCImplDecl *D) {
 774   VisitObjCContainerDecl(D);
 775   Writer.AddDeclRef(D->getClassInterface(), Record);
 776   // Abstract class (no need to define a stable serialization::DECL code).
 777 }
 778
 779 void ASTDeclWriter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D) {
 780   VisitObjCImplDecl(D);
 781   Writer.AddIdentifierRef(D->getIdentifier(), Record);
 782   Writer.AddSourceLocation(D->getCategoryNameLoc(), Record);
 783   Code = serialization::DECL_OBJC_CATEGORY_IMPL;
 784 }
 785
 786 void ASTDeclWriter::VisitObjCImplementationDecl(ObjCImplementationDecl *D) {
 787   VisitObjCImplDecl(D);
 788   Writer.AddDeclRef(D->getSuperClass(), Record);
 789   Writer.AddSourceLocation(D->getSuperClassLoc(), Record);
 790   Writer.AddSourceLocation(D->getIvarLBraceLoc(), Record);
 791   Writer.AddSourceLocation(D->getIvarRBraceLoc(), Record);
 792   Record.push_back(D->hasNonZeroConstructors());
 793   Record.push_back(D->hasDestructors());
 794   Record.push_back(D->NumIvarInitializers);
 795   if (D->NumIvarInitializers)
 796     Writer.AddCXXCtorInitializersRef(
 797         llvm::makeArrayRef(D->init_begin(), D->init_end()), Record);
 798   Code = serialization::DECL_OBJC_IMPLEMENTATION;
 799 }
 800
 801 void ASTDeclWriter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D) {
 802   VisitDecl(D);
 803   Writer.AddSourceLocation(D->getLocStart(), Record);
 804   Writer.AddDeclRef(D->getPropertyDecl(), Record);
 805   Writer.AddDeclRef(D->getPropertyIvarDecl(), Record);
 806   Writer.AddSourceLocation(D->getPropertyIvarDeclLoc(), Record);
 807   Writer.AddStmt(D->getGetterCXXConstructor());
 808   Writer.AddStmt(D->getSetterCXXAssignment());
 809   Code = serialization::DECL_OBJC_PROPERTY_IMPL;
 810 }
 811
 812 void ASTDeclWriter::VisitFieldDecl(FieldDecl *D) {
 813   VisitDeclaratorDecl(D);
 814   Record.push_back(D->isMutable());
 815   if (D->InitStorage.getInt() == FieldDecl::ISK_BitWidthOrNothing &&
 816       D->InitStorage.getPointer() == nullptr) {
 817     Record.push_back(0);
 818   } else if (D->InitStorage.getInt() == FieldDecl::ISK_CapturedVLAType) {
 819     Record.push_back(D->InitStorage.getInt() + 1);
 820     Writer.AddTypeRef(
 821         QualType(static_cast<Type *>(D->InitStorage.getPointer()), 0),
 822         Record);
 823   } else {
 824     Record.push_back(D->InitStorage.getInt() + 1);
 825     Writer.AddStmt(static_cast<Expr *>(D->InitStorage.getPointer()));
 826   }
 827   if (!D->getDeclName())
 828     Writer.AddDeclRef(Context.getInstantiatedFromUnnamedFieldDecl(D), Record);
 829
 830   if (D->getDeclContext() == D->getLexicalDeclContext() &&
 831       !D->hasAttrs() &&
 832       !D->isImplicit() &&
 833       !D->isUsed(false) &&
 834       !D->isInvalidDecl() &&
 835       !D->isReferenced() &&
 836       !D->isTopLevelDeclInObjCContainer() &&
 837       !D->isModulePrivate() &&
 838       !D->getBitWidth() &&
 839       !D->hasInClassInitializer() &&
 840       !D->hasExtInfo() &&
 841       !ObjCIvarDecl::classofKind(D->getKind()) &&
 842       !ObjCAtDefsFieldDecl::classofKind(D->getKind()) &&
 843       D->getDeclName())
 844     AbbrevToUse = Writer.getDeclFieldAbbrev();
 845
 846   Code = serialization::DECL_FIELD;
 847 }
 848
 849 void ASTDeclWriter::VisitMSPropertyDecl(MSPropertyDecl *D) {
 850   VisitDeclaratorDecl(D);
 851   Writer.AddIdentifierRef(D->getGetterId(), Record);
 852   Writer.AddIdentifierRef(D->getSetterId(), Record);
 853   Code = serialization::DECL_MS_PROPERTY;
 854 }
 855
 856 void ASTDeclWriter::VisitIndirectFieldDecl(IndirectFieldDecl *D) {
 857   VisitValueDecl(D);
 858   Record.push_back(D->getChainingSize());
 859
 860   for (const auto *P : D->chain())
 861     Writer.AddDeclRef(P, Record);
 862   Code = serialization::DECL_INDIRECTFIELD;
 863 }
 864
 865 void ASTDeclWriter::VisitVarDecl(VarDecl *D) {
 866   VisitRedeclarable(D);
 867   VisitDeclaratorDecl(D);
 868   Record.push_back(D->getStorageClass());
 869   Record.push_back(D->getTSCSpec());
 870   Record.push_back(D->getInitStyle());
 871   if (!isa<ParmVarDecl>(D)) {
 872     Record.push_back(D->isExceptionVariable());
 873     Record.push_back(D->isNRVOVariable());
 874     Record.push_back(D->isCXXForRangeDecl());
 875     Record.push_back(D->isARCPseudoStrong());
 876     Record.push_back(D->isConstexpr());
 877     Record.push_back(D->isInitCapture());
 878     Record.push_back(D->isPreviousDeclInSameBlockScope());
 879   }
 880   Record.push_back(D->getLinkageInternal());
 881
 882   if (D->getInit()) {
 883     Record.push_back(!D->isInitKnownICE() ? 1 : (D->isInitICE() ? 3 : 2));
 884     Writer.AddStmt(D->getInit());
 885   } else {
 886     Record.push_back(0);
 887   }
 888
 889   enum {
 890     VarNotTemplate = 0, VarTemplate, StaticDataMemberSpecialization
 891   };
 892   if (VarTemplateDecl *TemplD = D->getDescribedVarTemplate()) {
 893     Record.push_back(VarTemplate);
 894     Writer.AddDeclRef(TemplD, Record);
 895   } else if (MemberSpecializationInfo *SpecInfo
 896                = D->getMemberSpecializationInfo()) {
 897     Record.push_back(StaticDataMemberSpecialization);
 898     Writer.AddDeclRef(SpecInfo->getInstantiatedFrom(), Record);
 899     Record.push_back(SpecInfo->getTemplateSpecializationKind());
 900     Writer.AddSourceLocation(SpecInfo->getPointOfInstantiation(), Record);
 901   } else {
 902     Record.push_back(VarNotTemplate);
 903   }
 904
 905   if (D->getDeclContext() == D->getLexicalDeclContext() &&
 906       !D->hasAttrs() &&
 907       !D->isImplicit() &&
 908       !D->isUsed(false) &&
 909       !D->isInvalidDecl() &&
 910       !D->isReferenced() &&
 911       !D->isTopLevelDeclInObjCContainer() &&
 912       D->getAccess() == AS_none &&
 913       !D->isModulePrivate() &&
 914       !needsAnonymousDeclarationNumber(D) &&
 915       D->getDeclName().getNameKind() == DeclarationName::Identifier &&
 916       !D->hasExtInfo() &&
 917       D->getFirstDecl() == D->getMostRecentDecl() &&
 918       D->getInitStyle() == VarDecl::CInit &&
 919       D->getInit() == nullptr &&
 920       !isa<ParmVarDecl>(D) &&
 921       !isa<VarTemplateSpecializationDecl>(D) &&
 922       !D->isConstexpr() &&
 923       !D->isInitCapture() &&
 924       !D->isPreviousDeclInSameBlockScope() &&
 925       !D->getMemberSpecializationInfo())
 926     AbbrevToUse = Writer.getDeclVarAbbrev();
 927
 928   Code = serialization::DECL_VAR;
 929 }
 930
 931 void ASTDeclWriter::VisitImplicitParamDecl(ImplicitParamDecl *D) {
 932   VisitVarDecl(D);
 933   Code = serialization::DECL_IMPLICIT_PARAM;
 934 }
 935
 936 void ASTDeclWriter::VisitParmVarDecl(ParmVarDecl *D) {
 937   VisitVarDecl(D);
 938   Record.push_back(D->isObjCMethodParameter());
 939   Record.push_back(D->getFunctionScopeDepth());
 940   Record.push_back(D->getFunctionScopeIndex());
 941   Record.push_back(D->getObjCDeclQualifier()); // FIXME: stable encoding
 942   Record.push_back(D->isKNRPromoted());
 943   Record.push_back(D->hasInheritedDefaultArg());
 944   Record.push_back(D->hasUninstantiatedDefaultArg());
 945   if (D->hasUninstantiatedDefaultArg())
 946     Writer.AddStmt(D->getUninstantiatedDefaultArg());
 947   Code = serialization::DECL_PARM_VAR;
 948
 949   assert(!D->isARCPseudoStrong()); // can be true of ImplicitParamDecl
 950
 951   // If the assumptions about the DECL_PARM_VAR abbrev are true, use it.  Here
 952   // we dynamically check for the properties that we optimize for, but don't
 953   // know are true of all PARM_VAR_DECLs.
 954   if (D->getDeclContext() == D->getLexicalDeclContext() &&
 955       !D->hasAttrs() &&
 956       !D->hasExtInfo() &&
 957       !D->isImplicit() &&
 958       !D->isUsed(false) &&
 959       !D->isInvalidDecl() &&
 960       !D->isReferenced() &&
 961       D->getAccess() == AS_none &&
 962       !D->isModulePrivate() &&
 963       D->getStorageClass() == 0 &&
 964       D->getInitStyle() == VarDecl::CInit && // Can params have anything else?
 965       D->getFunctionScopeDepth() == 0 &&
 966       D->getObjCDeclQualifier() == 0 &&
 967       !D->isKNRPromoted() &&
 968       !D->hasInheritedDefaultArg() &&
 969       D->getInit() == nullptr &&
 970       !D->hasUninstantiatedDefaultArg())  // No default expr.
 971     AbbrevToUse = Writer.getDeclParmVarAbbrev();
 972
 973   // Check things we know are true of *every* PARM_VAR_DECL, which is more than
 974   // just us assuming it.
 975   assert(!D->getTSCSpec() && "PARM_VAR_DECL can't use TLS");
 976   assert(D->getAccess() == AS_none && "PARM_VAR_DECL can't be public/private");
 977   assert(!D->isExceptionVariable() && "PARM_VAR_DECL can't be exception var");
 978   assert(D->getPreviousDecl() == nullptr && "PARM_VAR_DECL can't be redecl");
 979   assert(!D->isStaticDataMember() &&
 980          "PARM_VAR_DECL can't be static data member");
 981 }
 982
 983 void ASTDeclWriter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
 984   VisitDecl(D);
 985   Writer.AddStmt(D->getAsmString());
 986   Writer.AddSourceLocation(D->getRParenLoc(), Record);
 987   Code = serialization::DECL_FILE_SCOPE_ASM;
 988 }
 989
 990 void ASTDeclWriter::VisitEmptyDecl(EmptyDecl *D) {
 991   VisitDecl(D);
 992   Code = serialization::DECL_EMPTY;
 993 }
 994
 995 void ASTDeclWriter::VisitBlockDecl(BlockDecl *D) {
 996   VisitDecl(D);
 997   Writer.AddStmt(D->getBody());
 998   Writer.AddTypeSourceInfo(D->getSignatureAsWritten(), Record);
 999   Record.push_back(D->param_size());
1000   for (FunctionDecl::param_iterator P = D->param_begin(), PEnd = D->param_end();
1001        P != PEnd; ++P)
1002     Writer.AddDeclRef(*P, Record);
1003   Record.push_back(D->isVariadic());
1004   Record.push_back(D->blockMissingReturnType());
1005   Record.push_back(D->isConversionFromLambda());
1006   Record.push_back(D->capturesCXXThis());
1007   Record.push_back(D->getNumCaptures());
1008   for (const auto &capture : D->captures()) {
1009     Writer.AddDeclRef(capture.getVariable(), Record);
1010
1011     unsigned flags = 0;
1012     if (capture.isByRef()) flags |= 1;
1013     if (capture.isNested()) flags |= 2;
1014     if (capture.hasCopyExpr()) flags |= 4;
1015     Record.push_back(flags);
1016
1017     if (capture.hasCopyExpr()) Writer.AddStmt(capture.getCopyExpr());
1018   }
1019
1020   Code = serialization::DECL_BLOCK;
1021 }
1022
1023 void ASTDeclWriter::VisitCapturedDecl(CapturedDecl *CD) {
1024   Record.push_back(CD->getNumParams());
1025   VisitDecl(CD);
1026   Record.push_back(CD->getContextParamPosition());
1027   Record.push_back(CD->isNothrow() ? 1 : 0);
1028   // Body is stored by VisitCapturedStmt.
1029   for (unsigned I = 0; I < CD->getNumParams(); ++I)
1030     Writer.AddDeclRef(CD->getParam(I), Record);
1031   Code = serialization::DECL_CAPTURED;
1032 }
1033
1034 void ASTDeclWriter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
1035   VisitDecl(D);
1036   Record.push_back(D->getLanguage());
1037   Writer.AddSourceLocation(D->getExternLoc(), Record);
1038   Writer.AddSourceLocation(D->getRBraceLoc(), Record);
1039   Code = serialization::DECL_LINKAGE_SPEC;
1040 }
1041
1042 void ASTDeclWriter::VisitLabelDecl(LabelDecl *D) {
1043   VisitNamedDecl(D);
1044   Writer.AddSourceLocation(D->getLocStart(), Record);
1045   Code = serialization::DECL_LABEL;
1046 }
1047
1048
1049 void ASTDeclWriter::VisitNamespaceDecl(NamespaceDecl *D) {
1050   VisitRedeclarable(D);
1051   VisitNamedDecl(D);
1052   Record.push_back(D->isInline());
1053   Writer.AddSourceLocation(D->getLocStart(), Record);
1054   Writer.AddSourceLocation(D->getRBraceLoc(), Record);
1055
1056   if (D->isOriginalNamespace())
1057     Writer.AddDeclRef(D->getAnonymousNamespace(), Record);
1058   Code = serialization::DECL_NAMESPACE;
1059
1060   if (Writer.hasChain() && D->isAnonymousNamespace() &&
1061       D == D->getMostRecentDecl()) {
1062     // This is a most recent reopening of the anonymous namespace. If its parent
1063     // is in a previous PCH (or is the TU), mark that parent for update, because
1064     // the original namespace always points to the latest re-opening of its
1065     // anonymous namespace.
1066     Decl *Parent = cast<Decl>(
1067         D->getParent()->getRedeclContext()->getPrimaryContext());
1068     if (Parent->isFromASTFile() || isa<TranslationUnitDecl>(Parent)) {
1069       Writer.DeclUpdates[Parent].push_back(
1070           ASTWriter::DeclUpdate(UPD_CXX_ADDED_ANONYMOUS_NAMESPACE, D));
1071     }
1072   }
1073 }
1074
1075 void ASTDeclWriter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
1076   VisitRedeclarable(D);
1077   VisitNamedDecl(D);
1078   Writer.AddSourceLocation(D->getNamespaceLoc(), Record);
1079   Writer.AddSourceLocation(D->getTargetNameLoc(), Record);
1080   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
1081   Writer.AddDeclRef(D->getNamespace(), Record);
1082   Code = serialization::DECL_NAMESPACE_ALIAS;
1083 }
1084
1085 void ASTDeclWriter::VisitUsingDecl(UsingDecl *D) {
1086   VisitNamedDecl(D);
1087   Writer.AddSourceLocation(D->getUsingLoc(), Record);
1088   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
1089   Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
1090   Writer.AddDeclRef(D->FirstUsingShadow.getPointer(), Record);
1091   Record.push_back(D->hasTypename());
1092   Writer.AddDeclRef(Context.getInstantiatedFromUsingDecl(D), Record);
1093   Code = serialization::DECL_USING;
1094 }
1095
1096 void ASTDeclWriter::VisitUsingShadowDecl(UsingShadowDecl *D) {
1097   VisitRedeclarable(D);
1098   VisitNamedDecl(D);
1099   Writer.AddDeclRef(D->getTargetDecl(), Record);
1100   Writer.AddDeclRef(D->UsingOrNextShadow, Record);
1101   Writer.AddDeclRef(Context.getInstantiatedFromUsingShadowDecl(D), Record);
1102   Code = serialization::DECL_USING_SHADOW;
1103 }
1104
1105 void ASTDeclWriter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
1106   VisitNamedDecl(D);
1107   Writer.AddSourceLocation(D->getUsingLoc(), Record);
1108   Writer.AddSourceLocation(D->getNamespaceKeyLocation(), Record);
1109   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
1110   Writer.AddDeclRef(D->getNominatedNamespace(), Record);
1111   Writer.AddDeclRef(dyn_cast<Decl>(D->getCommonAncestor()), Record);
1112   Code = serialization::DECL_USING_DIRECTIVE;
1113 }
1114
1115 void ASTDeclWriter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
1116   VisitValueDecl(D);
1117   Writer.AddSourceLocation(D->getUsingLoc(), Record);
1118   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
1119   Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
1120   Code = serialization::DECL_UNRESOLVED_USING_VALUE;
1121 }
1122
1123 void ASTDeclWriter::VisitUnresolvedUsingTypenameDecl(
1124                                                UnresolvedUsingTypenameDecl *D) {
1125   VisitTypeDecl(D);
1126   Writer.AddSourceLocation(D->getTypenameLoc(), Record);
1127   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
1128   Code = serialization::DECL_UNRESOLVED_USING_TYPENAME;
1129 }
1130
1131 void ASTDeclWriter::VisitCXXRecordDecl(CXXRecordDecl *D) {
1132   VisitRecordDecl(D);
1133
1134   enum {
1135     CXXRecNotTemplate = 0, CXXRecTemplate, CXXRecMemberSpecialization
1136   };
1137   if (ClassTemplateDecl *TemplD = D->getDescribedClassTemplate()) {
1138     Record.push_back(CXXRecTemplate);
1139     Writer.AddDeclRef(TemplD, Record);
1140   } else if (MemberSpecializationInfo *MSInfo
1141                = D->getMemberSpecializationInfo()) {
1142     Record.push_back(CXXRecMemberSpecialization);
1143     Writer.AddDeclRef(MSInfo->getInstantiatedFrom(), Record);
1144     Record.push_back(MSInfo->getTemplateSpecializationKind());
1145     Writer.AddSourceLocation(MSInfo->getPointOfInstantiation(), Record);
1146   } else {
1147     Record.push_back(CXXRecNotTemplate);
1148   }
1149
1150   Record.push_back(D->isThisDeclarationADefinition());
1151   if (D->isThisDeclarationADefinition())
1152     Writer.AddCXXDefinitionData(D, Record);
1153
1154   // Store (what we currently believe to be) the key function to avoid
1155   // deserializing every method so we can compute it.
1156   if (D->IsCompleteDefinition)
1157     Writer.AddDeclRef(Context.getCurrentKeyFunction(D), Record);
1158
1159   Code = serialization::DECL_CXX_RECORD;
1160 }
1161
1162 void ASTDeclWriter::VisitCXXMethodDecl(CXXMethodDecl *D) {
1163   VisitFunctionDecl(D);
1164   if (D->isCanonicalDecl()) {
1165     Record.push_back(D->size_overridden_methods());
1166     for (CXXMethodDecl::method_iterator
1167            I = D->begin_overridden_methods(), E = D->end_overridden_methods();
1168            I != E; ++I)
1169       Writer.AddDeclRef(*I, Record);
1170   } else {
1171     // We only need to record overridden methods once for the canonical decl.
1172     Record.push_back(0);
1173   }
1174
1175   if (D->getDeclContext() == D->getLexicalDeclContext() &&
1176       D->getFirstDecl() == D->getMostRecentDecl() &&
1177       !D->isInvalidDecl() &&
1178       !D->hasAttrs() &&
1179       !D->isTopLevelDeclInObjCContainer() &&
1180       D->getDeclName().getNameKind() == DeclarationName::Identifier &&
1181       !D->hasExtInfo() &&
1182       !D->hasInheritedPrototype() &&
1183       D->hasWrittenPrototype())
1184     AbbrevToUse = Writer.getDeclCXXMethodAbbrev();
1185
1186   Code = serialization::DECL_CXX_METHOD;
1187 }
1188
1189 void ASTDeclWriter::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
1190   VisitCXXMethodDecl(D);
1191
1192   Writer.AddDeclRef(D->getInheritedConstructor(), Record);
1193   Record.push_back(D->IsExplicitSpecified);
1194
1195   Code = serialization::DECL_CXX_CONSTRUCTOR;
1196 }
1197
1198 void ASTDeclWriter::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
1199   VisitCXXMethodDecl(D);
1200
1201   Writer.AddDeclRef(D->getOperatorDelete(), Record);
1202
1203   Code = serialization::DECL_CXX_DESTRUCTOR;
1204 }
1205
1206 void ASTDeclWriter::VisitCXXConversionDecl(CXXConversionDecl *D) {
1207   VisitCXXMethodDecl(D);
1208   Record.push_back(D->IsExplicitSpecified);
1209   Code = serialization::DECL_CXX_CONVERSION;
1210 }
1211
1212 void ASTDeclWriter::VisitImportDecl(ImportDecl *D) {
1213   VisitDecl(D);
1214   Record.push_back(Writer.getSubmoduleID(D->getImportedModule()));
1215   ArrayRef<SourceLocation> IdentifierLocs = D->getIdentifierLocs();
1216   Record.push_back(!IdentifierLocs.empty());
1217   if (IdentifierLocs.empty()) {
1218     Writer.AddSourceLocation(D->getLocEnd(), Record);
1219     Record.push_back(1);
1220   } else {
1221     for (unsigned I = 0, N = IdentifierLocs.size(); I != N; ++I)
1222       Writer.AddSourceLocation(IdentifierLocs[I], Record);
1223     Record.push_back(IdentifierLocs.size());
1224   }
1225   // Note: the number of source locations must always be the last element in
1226   // the record.
1227   Code = serialization::DECL_IMPORT;
1228 }
1229
1230 void ASTDeclWriter::VisitAccessSpecDecl(AccessSpecDecl *D) {
1231   VisitDecl(D);
1232   Writer.AddSourceLocation(D->getColonLoc(), Record);
1233   Code = serialization::DECL_ACCESS_SPEC;
1234 }
1235
1236 void ASTDeclWriter::VisitFriendDecl(FriendDecl *D) {
1237   // Record the number of friend type template parameter lists here
1238   // so as to simplify memory allocation during deserialization.
1239   Record.push_back(D->NumTPLists);
1240   VisitDecl(D);
1241   bool hasFriendDecl = D->Friend.is<NamedDecl*>();
1242   Record.push_back(hasFriendDecl);
1243   if (hasFriendDecl)
1244     Writer.AddDeclRef(D->getFriendDecl(), Record);
1245   else
1246     Writer.AddTypeSourceInfo(D->getFriendType(), Record);
1247   for (unsigned i = 0; i < D->NumTPLists; ++i)
1248     Writer.AddTemplateParameterList(D->getFriendTypeTemplateParameterList(i),
1249                                     Record);
1250   Writer.AddDeclRef(D->getNextFriend(), Record);
1251   Record.push_back(D->UnsupportedFriend);
1252   Writer.AddSourceLocation(D->FriendLoc, Record);
1253   Code = serialization::DECL_FRIEND;
1254 }
1255
1256 void ASTDeclWriter::VisitFriendTemplateDecl(FriendTemplateDecl *D) {
1257   VisitDecl(D);
1258   Record.push_back(D->getNumTemplateParameters());
1259   for (unsigned i = 0, e = D->getNumTemplateParameters(); i != e; ++i)
1260     Writer.AddTemplateParameterList(D->getTemplateParameterList(i), Record);
1261   Record.push_back(D->getFriendDecl() != nullptr);
1262   if (D->getFriendDecl())
1263     Writer.AddDeclRef(D->getFriendDecl(), Record);
1264   else
1265     Writer.AddTypeSourceInfo(D->getFriendType(), Record);
1266   Writer.AddSourceLocation(D->getFriendLoc(), Record);
1267   Code = serialization::DECL_FRIEND_TEMPLATE;
1268 }
1269
1270 void ASTDeclWriter::VisitTemplateDecl(TemplateDecl *D) {
1271   VisitNamedDecl(D);
1272
1273   Writer.AddDeclRef(D->getTemplatedDecl(), Record);
1274   Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1275 }
1276
1277 void ASTDeclWriter::VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D) {
1278   VisitRedeclarable(D);
1279
1280   // Emit data to initialize CommonOrPrev before VisitTemplateDecl so that
1281   // getCommonPtr() can be used while this is still initializing.
1282   if (D->isFirstDecl()) {
1283     // This declaration owns the 'common' pointer, so serialize that data now.
1284     Writer.AddDeclRef(D->getInstantiatedFromMemberTemplate(), Record);
1285     if (D->getInstantiatedFromMemberTemplate())
1286       Record.push_back(D->isMemberSpecialization());
1287   }
1288
1289   VisitTemplateDecl(D);
1290   Record.push_back(D->getIdentifierNamespace());
1291 }
1292
1293 void ASTDeclWriter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1294   VisitRedeclarableTemplateDecl(D);
1295
1296   if (D->isFirstDecl())
1297     AddTemplateSpecializations(D);
1298   Code = serialization::DECL_CLASS_TEMPLATE;
1299 }
1300
1301 void ASTDeclWriter::VisitClassTemplateSpecializationDecl(
1302                                            ClassTemplateSpecializationDecl *D) {
1303   RegisterTemplateSpecialization(D->getSpecializedTemplate(), D);
1304
1305   VisitCXXRecordDecl(D);
1306
1307   llvm::PointerUnion<ClassTemplateDecl *,
1308                      ClassTemplatePartialSpecializationDecl *> InstFrom
1309     = D->getSpecializedTemplateOrPartial();
1310   if (Decl *InstFromD = InstFrom.dyn_cast<ClassTemplateDecl *>()) {
1311     Writer.AddDeclRef(InstFromD, Record);
1312   } else {
1313     Writer.AddDeclRef(InstFrom.get<ClassTemplatePartialSpecializationDecl *>(),
1314                       Record);
1315     Writer.AddTemplateArgumentList(&D->getTemplateInstantiationArgs(), Record);
1316   }
1317
1318   Writer.AddTemplateArgumentList(&D->getTemplateArgs(), Record);
1319   Writer.AddSourceLocation(D->getPointOfInstantiation(), Record);
1320   Record.push_back(D->getSpecializationKind());
1321   Record.push_back(D->isCanonicalDecl());
1322
1323   if (D->isCanonicalDecl()) {
1324     // When reading, we'll add it to the folding set of the following template.
1325     Writer.AddDeclRef(D->getSpecializedTemplate()->getCanonicalDecl(), Record);
1326   }
1327
1328   // Explicit info.
1329   Writer.AddTypeSourceInfo(D->getTypeAsWritten(), Record);
1330   if (D->getTypeAsWritten()) {
1331     Writer.AddSourceLocation(D->getExternLoc(), Record);
1332     Writer.AddSourceLocation(D->getTemplateKeywordLoc(), Record);
1333   }
1334
1335   Code = serialization::DECL_CLASS_TEMPLATE_SPECIALIZATION;
1336 }
1337
1338 void ASTDeclWriter::VisitClassTemplatePartialSpecializationDecl(
1339                                     ClassTemplatePartialSpecializationDecl *D) {
1340   VisitClassTemplateSpecializationDecl(D);
1341
1342   Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1343   Writer.AddASTTemplateArgumentListInfo(D->getTemplateArgsAsWritten(), Record);
1344
1345   // These are read/set from/to the first declaration.
1346   if (D->getPreviousDecl() == nullptr) {
1347     Writer.AddDeclRef(D->getInstantiatedFromMember(), Record);
1348     Record.push_back(D->isMemberSpecialization());
1349   }
1350
1351   Code = serialization::DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION;
1352 }
1353
1354 void ASTDeclWriter::VisitVarTemplateDecl(VarTemplateDecl *D) {
1355   VisitRedeclarableTemplateDecl(D);
1356
1357   if (D->isFirstDecl())
1358     AddTemplateSpecializations(D);
1359   Code = serialization::DECL_VAR_TEMPLATE;
1360 }
1361
1362 void ASTDeclWriter::VisitVarTemplateSpecializationDecl(
1363     VarTemplateSpecializationDecl *D) {
1364   RegisterTemplateSpecialization(D->getSpecializedTemplate(), D);
1365
1366   VisitVarDecl(D);
1367
1368   llvm::PointerUnion<VarTemplateDecl *, VarTemplatePartialSpecializationDecl *>
1369   InstFrom = D->getSpecializedTemplateOrPartial();
1370   if (Decl *InstFromD = InstFrom.dyn_cast<VarTemplateDecl *>()) {
1371     Writer.AddDeclRef(InstFromD, Record);
1372   } else {
1373     Writer.AddDeclRef(InstFrom.get<VarTemplatePartialSpecializationDecl *>(),
1374                       Record);
1375     Writer.AddTemplateArgumentList(&D->getTemplateInstantiationArgs(), Record);
1376   }
1377
1378   // Explicit info.
1379   Writer.AddTypeSourceInfo(D->getTypeAsWritten(), Record);
1380   if (D->getTypeAsWritten()) {
1381     Writer.AddSourceLocation(D->getExternLoc(), Record);
1382     Writer.AddSourceLocation(D->getTemplateKeywordLoc(), Record);
1383   }
1384
1385   Writer.AddTemplateArgumentList(&D->getTemplateArgs(), Record);
1386   Writer.AddSourceLocation(D->getPointOfInstantiation(), Record);
1387   Record.push_back(D->getSpecializationKind());
1388   Record.push_back(D->isCanonicalDecl());
1389
1390   if (D->isCanonicalDecl()) {
1391     // When reading, we'll add it to the folding set of the following template.
1392     Writer.AddDeclRef(D->getSpecializedTemplate()->getCanonicalDecl(), Record);
1393   }
1394
1395   Code = serialization::DECL_VAR_TEMPLATE_SPECIALIZATION;
1396 }
1397
1398 void ASTDeclWriter::VisitVarTemplatePartialSpecializationDecl(
1399     VarTemplatePartialSpecializationDecl *D) {
1400   VisitVarTemplateSpecializationDecl(D);
1401
1402   Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1403   Writer.AddASTTemplateArgumentListInfo(D->getTemplateArgsAsWritten(), Record);
1404
1405   // These are read/set from/to the first declaration.
1406   if (D->getPreviousDecl() == nullptr) {
1407     Writer.AddDeclRef(D->getInstantiatedFromMember(), Record);
1408     Record.push_back(D->isMemberSpecialization());
1409   }
1410
1411   Code = serialization::DECL_VAR_TEMPLATE_PARTIAL_SPECIALIZATION;
1412 }
1413
1414 void ASTDeclWriter::VisitClassScopeFunctionSpecializationDecl(
1415                                     ClassScopeFunctionSpecializationDecl *D) {
1416   VisitDecl(D);
1417   Writer.AddDeclRef(D->getSpecialization(), Record);
1418   Code = serialization::DECL_CLASS_SCOPE_FUNCTION_SPECIALIZATION;
1419 }
1420
1421
1422 void ASTDeclWriter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1423   VisitRedeclarableTemplateDecl(D);
1424
1425   if (D->isFirstDecl())
1426     AddTemplateSpecializations(D);
1427   Code = serialization::DECL_FUNCTION_TEMPLATE;
1428 }
1429
1430 void ASTDeclWriter::VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D) {
1431   VisitTypeDecl(D);
1432
1433   Record.push_back(D->wasDeclaredWithTypename());
1434
1435   bool OwnsDefaultArg = D->hasDefaultArgument() &&
1436                         !D->defaultArgumentWasInherited();
1437   Record.push_back(OwnsDefaultArg);
1438   if (OwnsDefaultArg)
1439     Writer.AddTypeSourceInfo(D->getDefaultArgumentInfo(), Record);
1440
1441   Code = serialization::DECL_TEMPLATE_TYPE_PARM;
1442 }
1443
1444 void ASTDeclWriter::VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {
1445   // For an expanded parameter pack, record the number of expansion types here
1446   // so that it's easier for deserialization to allocate the right amount of
1447   // memory.
1448   if (D->isExpandedParameterPack())
1449     Record.push_back(D->getNumExpansionTypes());
1450
1451   VisitDeclaratorDecl(D);
1452   // TemplateParmPosition.
1453   Record.push_back(D->getDepth());
1454   Record.push_back(D->getPosition());
1455
1456   if (D->isExpandedParameterPack()) {
1457     for (unsigned I = 0, N = D->getNumExpansionTypes(); I != N; ++I) {
1458       Writer.AddTypeRef(D->getExpansionType(I), Record);
1459       Writer.AddTypeSourceInfo(D->getExpansionTypeSourceInfo(I), Record);
1460     }
1461
1462     Code = serialization::DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK;
1463   } else {
1464     // Rest of NonTypeTemplateParmDecl.
1465     Record.push_back(D->isParameterPack());
1466     bool OwnsDefaultArg = D->hasDefaultArgument() &&
1467                           !D->defaultArgumentWasInherited();
1468     Record.push_back(OwnsDefaultArg);
1469     if (OwnsDefaultArg)
1470       Writer.AddStmt(D->getDefaultArgument());
1471     Code = serialization::DECL_NON_TYPE_TEMPLATE_PARM;
1472   }
1473 }
1474
1475 void ASTDeclWriter::VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D) {
1476   // For an expanded parameter pack, record the number of expansion types here
1477   // so that it's easier for deserialization to allocate the right amount of
1478   // memory.
1479   if (D->isExpandedParameterPack())
1480     Record.push_back(D->getNumExpansionTemplateParameters());
1481
1482   VisitTemplateDecl(D);
1483   // TemplateParmPosition.
1484   Record.push_back(D->getDepth());
1485   Record.push_back(D->getPosition());
1486
1487   if (D->isExpandedParameterPack()) {
1488     for (unsigned I = 0, N = D->getNumExpansionTemplateParameters();
1489          I != N; ++I)
1490       Writer.AddTemplateParameterList(D->getExpansionTemplateParameters(I),
1491                                       Record);
1492     Code = serialization::DECL_EXPANDED_TEMPLATE_TEMPLATE_PARM_PACK;
1493   } else {
1494     // Rest of TemplateTemplateParmDecl.
1495     Record.push_back(D->isParameterPack());
1496     bool OwnsDefaultArg = D->hasDefaultArgument() &&
1497                           !D->defaultArgumentWasInherited();
1498     Record.push_back(OwnsDefaultArg);
1499     if (OwnsDefaultArg)
1500       Writer.AddTemplateArgumentLoc(D->getDefaultArgument(), Record);
1501     Code = serialization::DECL_TEMPLATE_TEMPLATE_PARM;
1502   }
1503 }
1504
1505 void ASTDeclWriter::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) {
1506   VisitRedeclarableTemplateDecl(D);
1507   Code = serialization::DECL_TYPE_ALIAS_TEMPLATE;
1508 }
1509
1510 void ASTDeclWriter::VisitStaticAssertDecl(StaticAssertDecl *D) {
1511   VisitDecl(D);
1512   Writer.AddStmt(D->getAssertExpr());
1513   Record.push_back(D->isFailed());
1514   Writer.AddStmt(D->getMessage());
1515   Writer.AddSourceLocation(D->getRParenLoc(), Record);
1516   Code = serialization::DECL_STATIC_ASSERT;
1517 }
1518
1519 /// \brief Emit the DeclContext part of a declaration context decl.
1520 ///
1521 /// \param LexicalOffset the offset at which the DECL_CONTEXT_LEXICAL
1522 /// block for this declaration context is stored. May be 0 to indicate
1523 /// that there are no declarations stored within this context.
1524 ///
1525 /// \param VisibleOffset the offset at which the DECL_CONTEXT_VISIBLE
1526 /// block for this declaration context is stored. May be 0 to indicate
1527 /// that there are no declarations visible from this context. Note
1528 /// that this value will not be emitted for non-primary declaration
1529 /// contexts.
1530 void ASTDeclWriter::VisitDeclContext(DeclContext *DC, uint64_t LexicalOffset,
1531                                      uint64_t VisibleOffset) {
1532   Record.push_back(LexicalOffset);
1533   Record.push_back(VisibleOffset);
1534 }
1535
1536 const Decl *ASTWriter::getFirstLocalDecl(const Decl *D) {
1537   /// \brief Is this a local declaration (that is, one that will be written to
1538   /// our AST file)? This is the case for declarations that are neither imported
1539   /// from another AST file nor predefined.
1540   auto IsLocalDecl = [&](const Decl *D) -> bool {
1541     if (D->isFromASTFile())
1542       return false;
1543     auto I = DeclIDs.find(D);
1544     return (I == DeclIDs.end() || I->second >= NUM_PREDEF_DECL_IDS);
1545   };
1546
1547   assert(IsLocalDecl(D) && "expected a local declaration");
1548
1549   const Decl *Canon = D->getCanonicalDecl();
1550   if (IsLocalDecl(Canon))
1551     return Canon;
1552
1553   const Decl *&CacheEntry = FirstLocalDeclCache[Canon];
1554   if (CacheEntry)
1555     return CacheEntry;
1556
1557   for (const Decl *Redecl = D; Redecl; Redecl = Redecl->getPreviousDecl())
1558     if (IsLocalDecl(Redecl))
1559       D = Redecl;
1560   return CacheEntry = D;
1561 }
1562
1563 template <typename T>
1564 void ASTDeclWriter::VisitRedeclarable(Redeclarable<T> *D) {
1565   T *First = D->getFirstDecl();
1566   T *MostRecent = First->getMostRecentDecl();
1567   T *DAsT = static_cast<T *>(D);
1568   if (MostRecent != First) {
1569     assert(isRedeclarableDeclKind(DAsT->getKind()) &&
1570            "Not considered redeclarable?");
1571
1572     Writer.AddDeclRef(First, Record);
1573
1574     // Write out a list of local redeclarations of this declaration if it's the
1575     // first local declaration in the chain.
1576     const Decl *FirstLocal = Writer.getFirstLocalDecl(DAsT);
1577     if (DAsT == FirstLocal) {
1578       // Emit a list of all imported first declarations so that we can be sure
1579       // that all redeclarations visible to this module are before D in the
1580       // redecl chain.
1581       unsigned I = Record.size();
1582       Record.push_back(0);
1583       if (Writer.Chain)
1584         AddFirstDeclFromEachModule(DAsT, /*IncludeLocal*/false);
1585       // This is the number of imported first declarations + 1.
1586       Record[I] = Record.size() - I;
1587
1588       // Collect the set of local redeclarations of this declaration, from
1589       // newest to oldest.
1590       RecordData LocalRedecls;
1591       for (const Decl *Prev = FirstLocal->getMostRecentDecl();
1592            Prev != FirstLocal; Prev = Prev->getPreviousDecl())
1593         if (!Prev->isFromASTFile())
1594           Writer.AddDeclRef(Prev, LocalRedecls);
1595
1596       // If we have any redecls, write them now as a separate record preceding
1597       // the declaration itself.
1598       if (LocalRedecls.empty())
1599         Record.push_back(0);
1600       else {
1601         Record.push_back(Writer.Stream.GetCurrentBitNo());
1602         Writer.Stream.EmitRecord(LOCAL_REDECLARATIONS, LocalRedecls);
1603       }
1604     } else {
1605       Record.push_back(0);
1606       Writer.AddDeclRef(FirstLocal, Record);
1607     }
1608
1609     // Make sure that we serialize both the previous and the most-recent
1610     // declarations, which (transitively) ensures that all declarations in the
1611     // chain get serialized.
1612     //
1613     // FIXME: This is not correct; when we reach an imported declaration we
1614     // won't emit its previous declaration.
1615     (void)Writer.GetDeclRef(D->getPreviousDecl());
1616     (void)Writer.GetDeclRef(MostRecent);
1617   } else {
1618     // We use the sentinel value 0 to indicate an only declaration.
1619     Record.push_back(0);
1620   }
1621 }
1622
1623 void ASTDeclWriter::VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D) {
1624   Record.push_back(D->varlist_size());
1625   VisitDecl(D);
1626   for (auto *I : D->varlists())
1627     Writer.AddStmt(I);
1628   Code = serialization::DECL_OMP_THREADPRIVATE;
1629 }
1630
1631 //===----------------------------------------------------------------------===//
1632 // ASTWriter Implementation
1633 //===----------------------------------------------------------------------===//
1634
1635 void ASTWriter::WriteDeclAbbrevs() {
1636   using namespace llvm;
1637
1638   BitCodeAbbrev *Abv;
1639
1640   // Abbreviation for DECL_FIELD
1641   Abv = new BitCodeAbbrev();
1642   Abv->Add(BitCodeAbbrevOp(serialization::DECL_FIELD));
1643   // Decl
1644   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1645   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1646   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1647   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1648   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1649   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1650   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1651   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1652   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1653   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1654   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1655   // NamedDecl
1656   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1657   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1658   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1659   // ValueDecl
1660   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1661   // DeclaratorDecl
1662   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1663   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1664   // FieldDecl
1665   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1666   Abv->Add(BitCodeAbbrevOp(0));                       //getBitWidth
1667   // Type Source Info
1668   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1669   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1670   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1671   DeclFieldAbbrev = Stream.EmitAbbrev(Abv);
1672
1673   // Abbreviation for DECL_OBJC_IVAR
1674   Abv = new BitCodeAbbrev();
1675   Abv->Add(BitCodeAbbrevOp(serialization::DECL_OBJC_IVAR));
1676   // Decl
1677   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1678   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1679   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1680   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1681   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1682   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1683   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1684   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1685   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1686   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1687   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1688   // NamedDecl
1689   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1690   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1691   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1692   // ValueDecl
1693   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1694   // DeclaratorDecl
1695   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1696   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1697   // FieldDecl
1698   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1699   Abv->Add(BitCodeAbbrevOp(0));                       //getBitWidth
1700   // ObjC Ivar
1701   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getAccessControl
1702   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getSynthesize
1703   // Type Source Info
1704   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1705   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1706   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1707   DeclObjCIvarAbbrev = Stream.EmitAbbrev(Abv);
1708
1709   // Abbreviation for DECL_ENUM
1710   Abv = new BitCodeAbbrev();
1711   Abv->Add(BitCodeAbbrevOp(serialization::DECL_ENUM));
1712   // Redeclarable
1713   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1714   // Decl
1715   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1716   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1717   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1718   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1719   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1720   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1721   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1722   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1723   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1724   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1725   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1726   // NamedDecl
1727   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1728   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1729   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1730   // TypeDecl
1731   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1732   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1733   // TagDecl
1734   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1735   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1736   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1737   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1738   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1739   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsCompleteDefinitionRequired
1740   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1741   Abv->Add(BitCodeAbbrevOp(0));                         // ExtInfoKind
1742   // EnumDecl
1743   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // AddTypeRef
1744   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IntegerType
1745   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getPromotionType
1746   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumPositiveBits
1747   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumNegativeBits
1748   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScoped
1749   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScopedUsingClassTag
1750   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isFixed
1751   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // InstantiatedMembEnum
1752   // DC
1753   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1754   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1755   DeclEnumAbbrev = Stream.EmitAbbrev(Abv);
1756
1757   // Abbreviation for DECL_RECORD
1758   Abv = new BitCodeAbbrev();
1759   Abv->Add(BitCodeAbbrevOp(serialization::DECL_RECORD));
1760   // Redeclarable
1761   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1762   // Decl
1763   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1764   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1765   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1766   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1767   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1768   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1769   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1770   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1771   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1772   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1773   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1774   // NamedDecl
1775   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1776   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1777   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1778   // TypeDecl
1779   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1780   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1781   // TagDecl
1782   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1783   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1784   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1785   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1786   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1787   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsCompleteDefinitionRequired
1788   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1789   Abv->Add(BitCodeAbbrevOp(0));                         // ExtInfoKind
1790   // RecordDecl
1791   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // FlexibleArrayMember
1792   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // AnonymousStructUnion
1793   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasObjectMember
1794   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasVolatileMember
1795   // DC
1796   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1797   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1798   DeclRecordAbbrev = Stream.EmitAbbrev(Abv);
1799
1800   // Abbreviation for DECL_PARM_VAR
1801   Abv = new BitCodeAbbrev();
1802   Abv->Add(BitCodeAbbrevOp(serialization::DECL_PARM_VAR));
1803   // Redeclarable
1804   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1805   // Decl
1806   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1807   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1808   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1809   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1810   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1811   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1812   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1813   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1814   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1815   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1816   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1817   // NamedDecl
1818   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1819   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1820   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1821   // ValueDecl
1822   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1823   // DeclaratorDecl
1824   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1825   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1826   // VarDecl
1827   Abv->Add(BitCodeAbbrevOp(0));                       // StorageClass
1828   Abv->Add(BitCodeAbbrevOp(0));                       // getTSCSpec
1829   Abv->Add(BitCodeAbbrevOp(0));                       // hasCXXDirectInitializer
1830   Abv->Add(BitCodeAbbrevOp(0));                       // Linkage
1831   Abv->Add(BitCodeAbbrevOp(0));                       // HasInit
1832   Abv->Add(BitCodeAbbrevOp(0));                   // HasMemberSpecializationInfo
1833   // ParmVarDecl
1834   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsObjCMethodParameter
1835   Abv->Add(BitCodeAbbrevOp(0));                       // ScopeDepth
1836   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ScopeIndex
1837   Abv->Add(BitCodeAbbrevOp(0));                       // ObjCDeclQualifier
1838   Abv->Add(BitCodeAbbrevOp(0));                       // KNRPromoted
1839   Abv->Add(BitCodeAbbrevOp(0));                       // HasInheritedDefaultArg
1840   Abv->Add(BitCodeAbbrevOp(0));                   // HasUninstantiatedDefaultArg
1841   // Type Source Info
1842   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1843   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1844   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1845   DeclParmVarAbbrev = Stream.EmitAbbrev(Abv);
1846
1847   // Abbreviation for DECL_TYPEDEF
1848   Abv = new BitCodeAbbrev();
1849   Abv->Add(BitCodeAbbrevOp(serialization::DECL_TYPEDEF));
1850   // Redeclarable
1851   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1852   // Decl
1853   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1854   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1855   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1856   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1857   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1858   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isUsed
1859   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isReferenced
1860   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1861   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // C++ AccessSpecifier
1862   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1863   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1864   // NamedDecl
1865   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1866   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1867   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1868   // TypeDecl
1869   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1870   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1871   // TypedefDecl
1872   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1873   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1874   DeclTypedefAbbrev = Stream.EmitAbbrev(Abv);
1875
1876   // Abbreviation for DECL_VAR
1877   Abv = new BitCodeAbbrev();
1878   Abv->Add(BitCodeAbbrevOp(serialization::DECL_VAR));
1879   // Redeclarable
1880   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1881   // Decl
1882   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1883   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1884   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1885   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1886   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1887   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1888   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1889   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1890   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1891   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1892   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1893   // NamedDecl
1894   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1895   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1896   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1897   // ValueDecl
1898   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1899   // DeclaratorDecl
1900   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1901   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1902   // VarDecl
1903   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // StorageClass
1904   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // getTSCSpec
1905   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // CXXDirectInitializer
1906   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isExceptionVariable
1907   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isNRVOVariable
1908   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCXXForRangeDecl
1909   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isARCPseudoStrong
1910   Abv->Add(BitCodeAbbrevOp(0));                         // isConstexpr
1911   Abv->Add(BitCodeAbbrevOp(0));                         // isInitCapture
1912   Abv->Add(BitCodeAbbrevOp(0));                         // isPrevDeclInSameScope
1913   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Linkage
1914   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // HasInit
1915   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // HasMemberSpecInfo
1916   // Type Source Info
1917   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1918   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1919   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1920   DeclVarAbbrev = Stream.EmitAbbrev(Abv);
1921
1922   // Abbreviation for DECL_CXX_METHOD
1923   Abv = new BitCodeAbbrev();
1924   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CXX_METHOD));
1925   // RedeclarableDecl
1926   Abv->Add(BitCodeAbbrevOp(0));                         // CanonicalDecl
1927   // Decl
1928   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // DeclContext
1929   Abv->Add(BitCodeAbbrevOp(0));                         // LexicalDeclContext
1930   Abv->Add(BitCodeAbbrevOp(0));                         // Invalid
1931   Abv->Add(BitCodeAbbrevOp(0));                         // HasAttrs
1932   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Implicit
1933   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Used
1934   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Referenced
1935   Abv->Add(BitCodeAbbrevOp(0));                         // InObjCContainer
1936   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // Access
1937   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ModulePrivate
1938   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SubmoduleID
1939   // NamedDecl
1940   Abv->Add(BitCodeAbbrevOp(DeclarationName::Identifier)); // NameKind
1941   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // Identifier
1942   Abv->Add(BitCodeAbbrevOp(0));                         // AnonDeclNumber
1943   // ValueDecl
1944   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // Type
1945   // DeclaratorDecl
1946   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // InnerLocStart
1947   Abv->Add(BitCodeAbbrevOp(0));                         // HasExtInfo
1948   // FunctionDecl
1949   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 11)); // IDNS
1950   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // StorageClass
1951   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Inline
1952   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InlineSpecified
1953   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // VirtualAsWritten
1954   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Pure
1955   Abv->Add(BitCodeAbbrevOp(0));                         // HasInheritedProto
1956   Abv->Add(BitCodeAbbrevOp(1));                         // HasWrittenProto
1957   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Deleted
1958   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Trivial
1959   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Defaulted
1960   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ExplicitlyDefaulted
1961   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ImplicitReturnZero
1962   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constexpr
1963   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // SkippedBody
1964   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // LateParsed
1965   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Linkage
1966   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LocEnd
1967   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // TemplateKind
1968   // This Array slurps the rest of the record. Fortunately we want to encode
1969   // (nearly) all the remaining (variable number of) fields in the same way.
1970   //
1971   // This is the function template information if any, then
1972   //         NumParams and Params[] from FunctionDecl, and
1973   //         NumOverriddenMethods, OverriddenMethods[] from CXXMethodDecl.
1974   //
1975   //  Add an AbbrevOp for 'size then elements' and use it here.
1976   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1977   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1978   DeclCXXMethodAbbrev = Stream.EmitAbbrev(Abv);
1979
1980   // Abbreviation for EXPR_DECL_REF
1981   Abv = new BitCodeAbbrev();
1982   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_DECL_REF));
1983   //Stmt
1984   //Expr
1985   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1986   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
1987   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
1988   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
1989   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
1990   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
1991   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
1992   //DeclRefExpr
1993   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HasQualifier
1994   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //GetDeclFound
1995   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ExplicitTemplateArgs
1996   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HadMultipleCandidates
1997   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1998                            1)); // RefersToEnclosingVariableOrCapture
1999   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclRef
2000   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
2001   DeclRefExprAbbrev = Stream.EmitAbbrev(Abv);
2002
2003   // Abbreviation for EXPR_INTEGER_LITERAL
2004   Abv = new BitCodeAbbrev();
2005   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_INTEGER_LITERAL));
2006   //Stmt
2007   //Expr
2008   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2009   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2010   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2011   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2012   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2013   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2014   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2015   //Integer Literal
2016   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
2017   Abv->Add(BitCodeAbbrevOp(32));                      // Bit Width
2018   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Value
2019   IntegerLiteralAbbrev = Stream.EmitAbbrev(Abv);
2020
2021   // Abbreviation for EXPR_CHARACTER_LITERAL
2022   Abv = new BitCodeAbbrev();
2023   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_CHARACTER_LITERAL));
2024   //Stmt
2025   //Expr
2026   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2027   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2028   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2029   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2030   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2031   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2032   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2033   //Character Literal
2034   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getValue
2035   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
2036   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // getKind
2037   CharacterLiteralAbbrev = Stream.EmitAbbrev(Abv);
2038
2039   // Abbreviation for EXPR_IMPLICIT_CAST
2040   Abv = new BitCodeAbbrev();
2041   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_IMPLICIT_CAST));
2042   // Stmt
2043   // Expr
2044   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2045   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2046   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2047   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2048   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2049   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2050   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2051   // CastExpr
2052   Abv->Add(BitCodeAbbrevOp(0)); // PathSize
2053   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 6)); // CastKind
2054   // ImplicitCastExpr
2055   ExprImplicitCastAbbrev = Stream.EmitAbbrev(Abv);
2056
2057   Abv = new BitCodeAbbrev();
2058   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_LEXICAL));
2059   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2060   DeclContextLexicalAbbrev = Stream.EmitAbbrev(Abv);
2061
2062   Abv = new BitCodeAbbrev();
2063   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_VISIBLE));
2064   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2065   DeclContextVisibleLookupAbbrev = Stream.EmitAbbrev(Abv);
2066 }
2067
2068 /// isRequiredDecl - Check if this is a "required" Decl, which must be seen by
2069 /// consumers of the AST.
2070 ///
2071 /// Such decls will always be deserialized from the AST file, so we would like
2072 /// this to be as restrictive as possible. Currently the predicate is driven by
2073 /// code generation requirements, if other clients have a different notion of
2074 /// what is "required" then we may have to consider an alternate scheme where
2075 /// clients can iterate over the top-level decls and get information on them,
2076 /// without necessary deserializing them. We could explicitly require such
2077 /// clients to use a separate API call to "realize" the decl. This should be
2078 /// relatively painless since they would presumably only do it for top-level
2079 /// decls.
2080 static bool isRequiredDecl(const Decl *D, ASTContext &Context,
2081                            bool WritingModule) {
2082   // An ObjCMethodDecl is never considered as "required" because its
2083   // implementation container always is.
2084
2085   // File scoped assembly or obj-c implementation must be seen.
2086   if (isa<FileScopeAsmDecl>(D) || isa<ObjCImplDecl>(D))
2087     return true;
2088
2089   // ImportDecl is used by codegen to determine the set of imported modules to
2090   // search for inputs for automatic linking; include it if it has a semantic
2091   // effect.
2092   if (isa<ImportDecl>(D) && !WritingModule)
2093     return true;
2094
2095   return Context.DeclMustBeEmitted(D);
2096 }
2097
2098 void ASTWriter::WriteDecl(ASTContext &Context, Decl *D) {
2099   // Switch case IDs are per Decl.
2100   ClearSwitchCaseIDs();
2101
2102   RecordData Record;
2103   ASTDeclWriter W(*this, Context, Record);
2104
2105   // Determine the ID for this declaration.
2106   serialization::DeclID ID;
2107   assert(!D->isFromASTFile() && "should not be emitting imported decl");
2108   serialization::DeclID &IDR = DeclIDs[D];
2109   if (IDR == 0)
2110     IDR = NextDeclID++;
2111
2112   ID = IDR;
2113
2114   bool isReplacingADecl = ID < FirstDeclID;
2115
2116   // If this declaration is also a DeclContext, write blocks for the
2117   // declarations that lexically stored inside its context and those
2118   // declarations that are visible from its context. These blocks
2119   // are written before the declaration itself so that we can put
2120   // their offsets into the record for the declaration.
2121   uint64_t LexicalOffset = 0;
2122   uint64_t VisibleOffset = 0;
2123   DeclContext *DC = dyn_cast<DeclContext>(D);
2124   if (DC) {
2125     if (isReplacingADecl) {
2126       // It is replacing a decl from a chained PCH; make sure that the
2127       // DeclContext is fully loaded.
2128       if (DC->hasExternalLexicalStorage())
2129         DC->LoadLexicalDeclsFromExternalStorage();
2130       if (DC->hasExternalVisibleStorage())
2131         Chain->completeVisibleDeclsMap(DC);
2132     }
2133     LexicalOffset = WriteDeclContextLexicalBlock(Context, DC);
2134     VisibleOffset = WriteDeclContextVisibleBlock(Context, DC);
2135   }
2136
2137   // Build a record for this declaration
2138   Record.clear();
2139   W.Code = (serialization::DeclCode)0;
2140   W.AbbrevToUse = 0;
2141   W.Visit(D);
2142   if (DC) W.VisitDeclContext(DC, LexicalOffset, VisibleOffset);
2143
2144   if (isReplacingADecl) {
2145     // We're replacing a decl in a previous file.
2146     ReplacedDecls.push_back(ReplacedDeclInfo(ID, Stream.GetCurrentBitNo(),
2147                                              D->getLocation()));
2148   } else {
2149     unsigned Index = ID - FirstDeclID;
2150
2151     // Record the offset for this declaration
2152     SourceLocation Loc = D->getLocation();
2153     if (DeclOffsets.size() == Index)
2154       DeclOffsets.push_back(DeclOffset(Loc, Stream.GetCurrentBitNo()));
2155     else if (DeclOffsets.size() < Index) {
2156       DeclOffsets.resize(Index+1);
2157       DeclOffsets[Index].setLocation(Loc);
2158       DeclOffsets[Index].BitOffset = Stream.GetCurrentBitNo();
2159     }
2160
2161     SourceManager &SM = Context.getSourceManager();
2162     if (Loc.isValid() && SM.isLocalSourceLocation(Loc))
2163       associateDeclWithFile(D, ID);
2164   }
2165
2166   if (!W.Code)
2167     llvm::report_fatal_error(StringRef("unexpected declaration kind '") +
2168                             D->getDeclKindName() + "'");
2169   Stream.EmitRecord(W.Code, Record, W.AbbrevToUse);
2170
2171   // Flush any expressions, base specifiers, and ctor initializers that
2172   // were written as part of this declaration.
2173   FlushPendingAfterDecl();
2174
2175   // Note declarations that should be deserialized eagerly so that we can add
2176   // them to a record in the AST file later.
2177   if (isRequiredDecl(D, Context, WritingModule))
2178     EagerlyDeserializedDecls.push_back(ID);
2179 }
2180
2181 void ASTWriter::AddFunctionDefinition(const FunctionDecl *FD,
2182                                       RecordData &Record) {
2183   ClearSwitchCaseIDs();
2184
2185   ASTDeclWriter W(*this, FD->getASTContext(), Record);
2186   W.AddFunctionDefinition(FD);
2187 }