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 "ASTCommon.h"
  15 #include "clang/AST/DeclCXX.h"
  16 #include "clang/AST/DeclContextInternals.h"
  17 #include "clang/AST/DeclTemplate.h"
  18 #include "clang/AST/DeclVisitor.h"
  19 #include "clang/AST/Expr.h"
  20 #include "clang/AST/PrettyDeclStackTrace.h"
  21 #include "clang/Basic/SourceManager.h"
  22 #include "clang/Serialization/ASTReader.h"
  23 #include "clang/Serialization/ASTWriter.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     ASTWriter &Writer;
  36     ASTContext &Context;
  37     ASTRecordWriter Record;
  38
  39     serialization::DeclCode Code;
  40     unsigned AbbrevToUse;
  41
  42   public:
  43     ASTDeclWriter(ASTWriter &Writer, ASTContext &Context,
  44                   ASTWriter::RecordDataImpl &Record)
  45         : Writer(Writer), Context(Context), Record(Writer, Record),
  46           Code((serialization::DeclCode)0), AbbrevToUse(0) {}
  47
  48     uint64_t Emit(Decl *D) {
  49       if (!Code)
  50         llvm::report_fatal_error(StringRef("unexpected declaration kind '") +
  51             D->getDeclKindName() + "'");
  52       return Record.Emit(Code, AbbrevToUse);
  53     }
  54
  55     void Visit(Decl *D);
  56
  57     void VisitDecl(Decl *D);
  58     void VisitPragmaCommentDecl(PragmaCommentDecl *D);
  59     void VisitPragmaDetectMismatchDecl(PragmaDetectMismatchDecl *D);
  60     void VisitTranslationUnitDecl(TranslationUnitDecl *D);
  61     void VisitNamedDecl(NamedDecl *D);
  62     void VisitLabelDecl(LabelDecl *LD);
  63     void VisitNamespaceDecl(NamespaceDecl *D);
  64     void VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
  65     void VisitNamespaceAliasDecl(NamespaceAliasDecl *D);
  66     void VisitTypeDecl(TypeDecl *D);
  67     void VisitTypedefNameDecl(TypedefNameDecl *D);
  68     void VisitTypedefDecl(TypedefDecl *D);
  69     void VisitTypeAliasDecl(TypeAliasDecl *D);
  70     void VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
  71     void VisitTagDecl(TagDecl *D);
  72     void VisitEnumDecl(EnumDecl *D);
  73     void VisitRecordDecl(RecordDecl *D);
  74     void VisitCXXRecordDecl(CXXRecordDecl *D);
  75     void VisitClassTemplateSpecializationDecl(
  76                                             ClassTemplateSpecializationDecl *D);
  77     void VisitClassTemplatePartialSpecializationDecl(
  78                                      ClassTemplatePartialSpecializationDecl *D);
  79     void VisitVarTemplateSpecializationDecl(VarTemplateSpecializationDecl *D);
  80     void VisitVarTemplatePartialSpecializationDecl(
  81         VarTemplatePartialSpecializationDecl *D);
  82     void VisitClassScopeFunctionSpecializationDecl(
  83                                        ClassScopeFunctionSpecializationDecl *D);
  84     void VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D);
  85     void VisitValueDecl(ValueDecl *D);
  86     void VisitEnumConstantDecl(EnumConstantDecl *D);
  87     void VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
  88     void VisitDeclaratorDecl(DeclaratorDecl *D);
  89     void VisitFunctionDecl(FunctionDecl *D);
  90     void VisitCXXDeductionGuideDecl(CXXDeductionGuideDecl *D);
  91     void VisitCXXMethodDecl(CXXMethodDecl *D);
  92     void VisitCXXConstructorDecl(CXXConstructorDecl *D);
  93     void VisitCXXDestructorDecl(CXXDestructorDecl *D);
  94     void VisitCXXConversionDecl(CXXConversionDecl *D);
  95     void VisitFieldDecl(FieldDecl *D);
  96     void VisitMSPropertyDecl(MSPropertyDecl *D);
  97     void VisitIndirectFieldDecl(IndirectFieldDecl *D);
  98     void VisitVarDecl(VarDecl *D);
  99     void VisitImplicitParamDecl(ImplicitParamDecl *D);
 100     void VisitParmVarDecl(ParmVarDecl *D);
 101     void VisitDecompositionDecl(DecompositionDecl *D);
 102     void VisitBindingDecl(BindingDecl *D);
 103     void VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D);
 104     void VisitTemplateDecl(TemplateDecl *D);
 105     void VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D);
 106     void VisitClassTemplateDecl(ClassTemplateDecl *D);
 107     void VisitVarTemplateDecl(VarTemplateDecl *D);
 108     void VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
 109     void VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D);
 110     void VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D);
 111     void VisitUsingDecl(UsingDecl *D);
 112     void VisitUsingPackDecl(UsingPackDecl *D);
 113     void VisitUsingShadowDecl(UsingShadowDecl *D);
 114     void VisitConstructorUsingShadowDecl(ConstructorUsingShadowDecl *D);
 115     void VisitLinkageSpecDecl(LinkageSpecDecl *D);
 116     void VisitExportDecl(ExportDecl *D);
 117     void VisitFileScopeAsmDecl(FileScopeAsmDecl *D);
 118     void VisitImportDecl(ImportDecl *D);
 119     void VisitAccessSpecDecl(AccessSpecDecl *D);
 120     void VisitFriendDecl(FriendDecl *D);
 121     void VisitFriendTemplateDecl(FriendTemplateDecl *D);
 122     void VisitStaticAssertDecl(StaticAssertDecl *D);
 123     void VisitBlockDecl(BlockDecl *D);
 124     void VisitCapturedDecl(CapturedDecl *D);
 125     void VisitEmptyDecl(EmptyDecl *D);
 126
 127     void VisitDeclContext(DeclContext *DC);
 128     template <typename T> void VisitRedeclarable(Redeclarable<T> *D);
 129
 130
 131     // FIXME: Put in the same order is DeclNodes.td?
 132     void VisitObjCMethodDecl(ObjCMethodDecl *D);
 133     void VisitObjCTypeParamDecl(ObjCTypeParamDecl *D);
 134     void VisitObjCContainerDecl(ObjCContainerDecl *D);
 135     void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
 136     void VisitObjCIvarDecl(ObjCIvarDecl *D);
 137     void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
 138     void VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D);
 139     void VisitObjCCategoryDecl(ObjCCategoryDecl *D);
 140     void VisitObjCImplDecl(ObjCImplDecl *D);
 141     void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
 142     void VisitObjCImplementationDecl(ObjCImplementationDecl *D);
 143     void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D);
 144     void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
 145     void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
 146     void VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D);
 147     void VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D);
 148     void VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D);
 149
 150     /// Add an Objective-C type parameter list to the given record.
 151     void AddObjCTypeParamList(ObjCTypeParamList *typeParams) {
 152       // Empty type parameter list.
 153       if (!typeParams) {
 154         Record.push_back(0);
 155         return;
 156       }
 157
 158       Record.push_back(typeParams->size());
 159       for (auto typeParam : *typeParams) {
 160         Record.AddDeclRef(typeParam);
 161       }
 162       Record.AddSourceLocation(typeParams->getLAngleLoc());
 163       Record.AddSourceLocation(typeParams->getRAngleLoc());
 164     }
 165
 166     /// Add to the record the first declaration from each module file that
 167     /// provides a declaration of D. The intent is to provide a sufficient
 168     /// set such that reloading this set will load all current redeclarations.
 169     void AddFirstDeclFromEachModule(const Decl *D, bool IncludeLocal) {
 170       llvm::MapVector<ModuleFile*, const Decl*> Firsts;
 171       // FIXME: We can skip entries that we know are implied by others.
 172       for (const Decl *R = D->getMostRecentDecl(); R; R = R->getPreviousDecl()) {
 173         if (R->isFromASTFile())
 174           Firsts[Writer.Chain->getOwningModuleFile(R)] = R;
 175         else if (IncludeLocal)
 176           Firsts[nullptr] = R;
 177       }
 178       for (const auto &F : Firsts)
 179         Record.AddDeclRef(F.second);
 180     }
 181
 182     /// Get the specialization decl from an entry in the specialization list.
 183     template <typename EntryType>
 184     typename RedeclarableTemplateDecl::SpecEntryTraits<EntryType>::DeclType *
 185     getSpecializationDecl(EntryType &T) {
 186       return RedeclarableTemplateDecl::SpecEntryTraits<EntryType>::getDecl(&T);
 187     }
 188
 189     /// Get the list of partial specializations from a template's common ptr.
 190     template<typename T>
 191     decltype(T::PartialSpecializations) &getPartialSpecializations(T *Common) {
 192       return Common->PartialSpecializations;
 193     }
 194     ArrayRef<Decl> getPartialSpecializations(FunctionTemplateDecl::Common *) {
 195       return None;
 196     }
 197
 198     template<typename DeclTy>
 199     void AddTemplateSpecializations(DeclTy *D) {
 200       auto *Common = D->getCommonPtr();
 201
 202       // If we have any lazy specializations, and the external AST source is
 203       // our chained AST reader, we can just write out the DeclIDs. Otherwise,
 204       // we need to resolve them to actual declarations.
 205       if (Writer.Chain != Writer.Context->getExternalSource() &&
 206           Common->LazySpecializations) {
 207         D->LoadLazySpecializations();
 208         assert(!Common->LazySpecializations);
 209       }
 210
 211       ArrayRef<DeclID> LazySpecializations;
 212       if (auto *LS = Common->LazySpecializations)
 213         LazySpecializations = llvm::makeArrayRef(LS + 1, LS[0]);
 214
 215       // Add a slot to the record for the number of specializations.
 216       unsigned I = Record.size();
 217       Record.push_back(0);
 218
 219       // AddFirstDeclFromEachModule might trigger deserialization, invalidating
 220       // *Specializations iterators.
 221       llvm::SmallVector<const Decl*, 16> Specs;
 222       for (auto &Entry : Common->Specializations)
 223         Specs.push_back(getSpecializationDecl(Entry));
 224       for (auto &Entry : getPartialSpecializations(Common))
 225         Specs.push_back(getSpecializationDecl(Entry));
 226
 227       for (auto *D : Specs) {
 228         assert(D->isCanonicalDecl() && "non-canonical decl in set");
 229         AddFirstDeclFromEachModule(D, /*IncludeLocal*/true);
 230       }
 231       Record.append(LazySpecializations.begin(), LazySpecializations.end());
 232
 233       // Update the size entry we added earlier.
 234       Record[I] = Record.size() - I - 1;
 235     }
 236
 237     /// Ensure that this template specialization is associated with the specified
 238     /// template on reload.
 239     void RegisterTemplateSpecialization(const Decl *Template,
 240                                         const Decl *Specialization) {
 241       Template = Template->getCanonicalDecl();
 242
 243       // If the canonical template is local, we'll write out this specialization
 244       // when we emit it.
 245       // FIXME: We can do the same thing if there is any local declaration of
 246       // the template, to avoid emitting an update record.
 247       if (!Template->isFromASTFile())
 248         return;
 249
 250       // We only need to associate the first local declaration of the
 251       // specialization. The other declarations will get pulled in by it.
 252       if (Writer.getFirstLocalDecl(Specialization) != Specialization)
 253         return;
 254
 255       Writer.DeclUpdates[Template].push_back(ASTWriter::DeclUpdate(
 256           UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION, Specialization));
 257     }
 258   };
 259 }
 260
 261 void ASTDeclWriter::Visit(Decl *D) {
 262   DeclVisitor<ASTDeclWriter>::Visit(D);
 263
 264   // Source locations require array (variable-length) abbreviations.  The
 265   // abbreviation infrastructure requires that arrays are encoded last, so
 266   // we handle it here in the case of those classes derived from DeclaratorDecl
 267   if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)) {
 268     if (auto *TInfo = DD->getTypeSourceInfo())
 269       Record.AddTypeLoc(TInfo->getTypeLoc());
 270   }
 271
 272   // Handle FunctionDecl's body here and write it after all other Stmts/Exprs
 273   // have been written. We want it last because we will not read it back when
 274   // retrieving it from the AST, we'll just lazily set the offset.
 275   if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
 276     Record.push_back(FD->doesThisDeclarationHaveABody());
 277     if (FD->doesThisDeclarationHaveABody())
 278       Record.AddFunctionDefinition(FD);
 279   }
 280
 281   // If this declaration is also a DeclContext, write blocks for the
 282   // declarations that lexically stored inside its context and those
 283   // declarations that are visible from its context.
 284   if (DeclContext *DC = dyn_cast<DeclContext>(D))
 285     VisitDeclContext(DC);
 286 }
 287
 288 void ASTDeclWriter::VisitDecl(Decl *D) {
 289   Record.AddDeclRef(cast_or_null<Decl>(D->getDeclContext()));
 290   if (D->getDeclContext() != D->getLexicalDeclContext())
 291     Record.AddDeclRef(cast_or_null<Decl>(D->getLexicalDeclContext()));
 292   else
 293     Record.push_back(0);
 294   Record.push_back(D->isInvalidDecl());
 295   Record.push_back(D->hasAttrs());
 296   if (D->hasAttrs())
 297     Record.AddAttributes(D->getAttrs());
 298   Record.push_back(D->isImplicit());
 299   Record.push_back(D->isUsed(false));
 300   Record.push_back(D->isReferenced());
 301   Record.push_back(D->isTopLevelDeclInObjCContainer());
 302   Record.push_back(D->getAccess());
 303   Record.push_back(D->isModulePrivate());
 304   Record.push_back(Writer.getSubmoduleID(D->getOwningModule()));
 305
 306   // If this declaration injected a name into a context different from its
 307   // lexical context, and that context is an imported namespace, we need to
 308   // update its visible declarations to include this name.
 309   //
 310   // This happens when we instantiate a class with a friend declaration or a
 311   // function with a local extern declaration, for instance.
 312   //
 313   // FIXME: Can we handle this in AddedVisibleDecl instead?
 314   if (D->isOutOfLine()) {
 315     auto *DC = D->getDeclContext();
 316     while (auto *NS = dyn_cast<NamespaceDecl>(DC->getRedeclContext())) {
 317       if (!NS->isFromASTFile())
 318         break;
 319       Writer.UpdatedDeclContexts.insert(NS->getPrimaryContext());
 320       if (!NS->isInlineNamespace())
 321         break;
 322       DC = NS->getParent();
 323     }
 324   }
 325 }
 326
 327 void ASTDeclWriter::VisitPragmaCommentDecl(PragmaCommentDecl *D) {
 328   StringRef Arg = D->getArg();
 329   Record.push_back(Arg.size());
 330   VisitDecl(D);
 331   Record.AddSourceLocation(D->getLocStart());
 332   Record.push_back(D->getCommentKind());
 333   Record.AddString(Arg);
 334   Code = serialization::DECL_PRAGMA_COMMENT;
 335 }
 336
 337 void ASTDeclWriter::VisitPragmaDetectMismatchDecl(
 338     PragmaDetectMismatchDecl *D) {
 339   StringRef Name = D->getName();
 340   StringRef Value = D->getValue();
 341   Record.push_back(Name.size() + 1 + Value.size());
 342   VisitDecl(D);
 343   Record.AddSourceLocation(D->getLocStart());
 344   Record.AddString(Name);
 345   Record.AddString(Value);
 346   Code = serialization::DECL_PRAGMA_DETECT_MISMATCH;
 347 }
 348
 349 void ASTDeclWriter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
 350   llvm_unreachable("Translation units aren't directly serialized");
 351 }
 352
 353 void ASTDeclWriter::VisitNamedDecl(NamedDecl *D) {
 354   VisitDecl(D);
 355   Record.AddDeclarationName(D->getDeclName());
 356   Record.push_back(needsAnonymousDeclarationNumber(D)
 357                        ? Writer.getAnonymousDeclarationNumber(D)
 358                        : 0);
 359 }
 360
 361 void ASTDeclWriter::VisitTypeDecl(TypeDecl *D) {
 362   VisitNamedDecl(D);
 363   Record.AddSourceLocation(D->getLocStart());
 364   Record.AddTypeRef(QualType(D->getTypeForDecl(), 0));
 365 }
 366
 367 void ASTDeclWriter::VisitTypedefNameDecl(TypedefNameDecl *D) {
 368   VisitRedeclarable(D);
 369   VisitTypeDecl(D);
 370   Record.AddTypeSourceInfo(D->getTypeSourceInfo());
 371   Record.push_back(D->isModed());
 372   if (D->isModed())
 373     Record.AddTypeRef(D->getUnderlyingType());
 374   Record.AddDeclRef(D->getAnonDeclWithTypedefName(false));
 375 }
 376
 377 void ASTDeclWriter::VisitTypedefDecl(TypedefDecl *D) {
 378   VisitTypedefNameDecl(D);
 379   if (D->getDeclContext() == D->getLexicalDeclContext() &&
 380       !D->hasAttrs() &&
 381       !D->isImplicit() &&
 382       D->getFirstDecl() == D->getMostRecentDecl() &&
 383       !D->isInvalidDecl() &&
 384       !D->isTopLevelDeclInObjCContainer() &&
 385       !D->isModulePrivate() &&
 386       !needsAnonymousDeclarationNumber(D) &&
 387       D->getDeclName().getNameKind() == DeclarationName::Identifier)
 388     AbbrevToUse = Writer.getDeclTypedefAbbrev();
 389
 390   Code = serialization::DECL_TYPEDEF;
 391 }
 392
 393 void ASTDeclWriter::VisitTypeAliasDecl(TypeAliasDecl *D) {
 394   VisitTypedefNameDecl(D);
 395   Record.AddDeclRef(D->getDescribedAliasTemplate());
 396   Code = serialization::DECL_TYPEALIAS;
 397 }
 398
 399 void ASTDeclWriter::VisitTagDecl(TagDecl *D) {
 400   VisitRedeclarable(D);
 401   VisitTypeDecl(D);
 402   Record.push_back(D->getIdentifierNamespace());
 403   Record.push_back((unsigned)D->getTagKind()); // FIXME: stable encoding
 404   if (!isa<CXXRecordDecl>(D))
 405     Record.push_back(D->isCompleteDefinition());
 406   Record.push_back(D->isEmbeddedInDeclarator());
 407   Record.push_back(D->isFreeStanding());
 408   Record.push_back(D->isCompleteDefinitionRequired());
 409   Record.AddSourceRange(D->getBraceRange());
 410
 411   if (D->hasExtInfo()) {
 412     Record.push_back(1);
 413     Record.AddQualifierInfo(*D->getExtInfo());
 414   } else if (auto *TD = D->getTypedefNameForAnonDecl()) {
 415     Record.push_back(2);
 416     Record.AddDeclRef(TD);
 417     Record.AddIdentifierRef(TD->getDeclName().getAsIdentifierInfo());
 418   } else {
 419     Record.push_back(0);
 420   }
 421 }
 422
 423 void ASTDeclWriter::VisitEnumDecl(EnumDecl *D) {
 424   VisitTagDecl(D);
 425   Record.AddTypeSourceInfo(D->getIntegerTypeSourceInfo());
 426   if (!D->getIntegerTypeSourceInfo())
 427     Record.AddTypeRef(D->getIntegerType());
 428   Record.AddTypeRef(D->getPromotionType());
 429   Record.push_back(D->getNumPositiveBits());
 430   Record.push_back(D->getNumNegativeBits());
 431   Record.push_back(D->isScoped());
 432   Record.push_back(D->isScopedUsingClassTag());
 433   Record.push_back(D->isFixed());
 434   Record.push_back(D->getODRHash());
 435
 436   if (MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo()) {
 437     Record.AddDeclRef(MemberInfo->getInstantiatedFrom());
 438     Record.push_back(MemberInfo->getTemplateSpecializationKind());
 439     Record.AddSourceLocation(MemberInfo->getPointOfInstantiation());
 440   } else {
 441     Record.AddDeclRef(nullptr);
 442   }
 443
 444   if (D->getDeclContext() == D->getLexicalDeclContext() &&
 445       !D->hasAttrs() &&
 446       !D->isImplicit() &&
 447       !D->isUsed(false) &&
 448       !D->hasExtInfo() &&
 449       !D->getTypedefNameForAnonDecl() &&
 450       D->getFirstDecl() == D->getMostRecentDecl() &&
 451       !D->isInvalidDecl() &&
 452       !D->isReferenced() &&
 453       !D->isTopLevelDeclInObjCContainer() &&
 454       D->getAccess() == AS_none &&
 455       !D->isModulePrivate() &&
 456       !CXXRecordDecl::classofKind(D->getKind()) &&
 457       !D->getIntegerTypeSourceInfo() &&
 458       !D->getMemberSpecializationInfo() &&
 459       !needsAnonymousDeclarationNumber(D) &&
 460       D->getDeclName().getNameKind() == DeclarationName::Identifier)
 461     AbbrevToUse = Writer.getDeclEnumAbbrev();
 462
 463   Code = serialization::DECL_ENUM;
 464 }
 465
 466 void ASTDeclWriter::VisitRecordDecl(RecordDecl *D) {
 467   VisitTagDecl(D);
 468   Record.push_back(D->hasFlexibleArrayMember());
 469   Record.push_back(D->isAnonymousStructOrUnion());
 470   Record.push_back(D->hasObjectMember());
 471   Record.push_back(D->hasVolatileMember());
 472   Record.push_back(D->isNonTrivialToPrimitiveDefaultInitialize());
 473   Record.push_back(D->isNonTrivialToPrimitiveCopy());
 474   Record.push_back(D->isNonTrivialToPrimitiveDestroy());
 475   Record.push_back(D->isParamDestroyedInCallee());
 476   Record.push_back(D->getArgPassingRestrictions());
 477
 478   if (D->getDeclContext() == D->getLexicalDeclContext() &&
 479       !D->hasAttrs() &&
 480       !D->isImplicit() &&
 481       !D->isUsed(false) &&
 482       !D->hasExtInfo() &&
 483       !D->getTypedefNameForAnonDecl() &&
 484       D->getFirstDecl() == D->getMostRecentDecl() &&
 485       !D->isInvalidDecl() &&
 486       !D->isReferenced() &&
 487       !D->isTopLevelDeclInObjCContainer() &&
 488       D->getAccess() == AS_none &&
 489       !D->isModulePrivate() &&
 490       !CXXRecordDecl::classofKind(D->getKind()) &&
 491       !needsAnonymousDeclarationNumber(D) &&
 492       D->getDeclName().getNameKind() == DeclarationName::Identifier)
 493     AbbrevToUse = Writer.getDeclRecordAbbrev();
 494
 495   Code = serialization::DECL_RECORD;
 496 }
 497
 498 void ASTDeclWriter::VisitValueDecl(ValueDecl *D) {
 499   VisitNamedDecl(D);
 500   Record.AddTypeRef(D->getType());
 501 }
 502
 503 void ASTDeclWriter::VisitEnumConstantDecl(EnumConstantDecl *D) {
 504   VisitValueDecl(D);
 505   Record.push_back(D->getInitExpr()? 1 : 0);
 506   if (D->getInitExpr())
 507     Record.AddStmt(D->getInitExpr());
 508   Record.AddAPSInt(D->getInitVal());
 509
 510   Code = serialization::DECL_ENUM_CONSTANT;
 511 }
 512
 513 void ASTDeclWriter::VisitDeclaratorDecl(DeclaratorDecl *D) {
 514   VisitValueDecl(D);
 515   Record.AddSourceLocation(D->getInnerLocStart());
 516   Record.push_back(D->hasExtInfo());
 517   if (D->hasExtInfo())
 518     Record.AddQualifierInfo(*D->getExtInfo());
 519   // The location information is deferred until the end of the record.
 520   Record.AddTypeRef(D->getTypeSourceInfo() ? D->getTypeSourceInfo()->getType()
 521                                            : QualType());
 522 }
 523
 524 void ASTDeclWriter::VisitFunctionDecl(FunctionDecl *D) {
 525   VisitRedeclarable(D);
 526   VisitDeclaratorDecl(D);
 527   Record.AddDeclarationNameLoc(D->DNLoc, D->getDeclName());
 528   Record.push_back(D->getIdentifierNamespace());
 529
 530   // FunctionDecl's body is handled last at ASTWriterDecl::Visit,
 531   // after everything else is written.
 532
 533   Record.push_back((int)D->SClass); // FIXME: stable encoding
 534   Record.push_back(D->IsInline);
 535   Record.push_back(D->IsInlineSpecified);
 536   Record.push_back(D->IsExplicitSpecified);
 537   Record.push_back(D->IsVirtualAsWritten);
 538   Record.push_back(D->IsPure);
 539   Record.push_back(D->HasInheritedPrototype);
 540   Record.push_back(D->HasWrittenPrototype);
 541   Record.push_back(D->IsDeleted);
 542   Record.push_back(D->IsTrivial);
 543   Record.push_back(D->IsTrivialForCall);
 544   Record.push_back(D->IsDefaulted);
 545   Record.push_back(D->IsExplicitlyDefaulted);
 546   Record.push_back(D->HasImplicitReturnZero);
 547   Record.push_back(D->IsConstexpr);
 548   Record.push_back(D->UsesSEHTry);
 549   Record.push_back(D->HasSkippedBody);
 550   Record.push_back(D->IsMultiVersion);
 551   Record.push_back(D->IsLateTemplateParsed);
 552   Record.push_back(D->getLinkageInternal());
 553   Record.AddSourceLocation(D->getLocEnd());
 554
 555   Record.push_back(D->getODRHash());
 556
 557   Record.push_back(D->getTemplatedKind());
 558   switch (D->getTemplatedKind()) {
 559   case FunctionDecl::TK_NonTemplate:
 560     break;
 561   case FunctionDecl::TK_FunctionTemplate:
 562     Record.AddDeclRef(D->getDescribedFunctionTemplate());
 563     break;
 564   case FunctionDecl::TK_MemberSpecialization: {
 565     MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo();
 566     Record.AddDeclRef(MemberInfo->getInstantiatedFrom());
 567     Record.push_back(MemberInfo->getTemplateSpecializationKind());
 568     Record.AddSourceLocation(MemberInfo->getPointOfInstantiation());
 569     break;
 570   }
 571   case FunctionDecl::TK_FunctionTemplateSpecialization: {
 572     FunctionTemplateSpecializationInfo *
 573       FTSInfo = D->getTemplateSpecializationInfo();
 574
 575     RegisterTemplateSpecialization(FTSInfo->getTemplate(), D);
 576
 577     Record.AddDeclRef(FTSInfo->getTemplate());
 578     Record.push_back(FTSInfo->getTemplateSpecializationKind());
 579
 580     // Template arguments.
 581     Record.AddTemplateArgumentList(FTSInfo->TemplateArguments);
 582
 583     // Template args as written.
 584     Record.push_back(FTSInfo->TemplateArgumentsAsWritten != nullptr);
 585     if (FTSInfo->TemplateArgumentsAsWritten) {
 586       Record.push_back(FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs);
 587       for (int i=0, e = FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs;
 588              i!=e; ++i)
 589         Record.AddTemplateArgumentLoc(
 590             (*FTSInfo->TemplateArgumentsAsWritten)[i]);
 591       Record.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->LAngleLoc);
 592       Record.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->RAngleLoc);
 593     }
 594
 595     Record.AddSourceLocation(FTSInfo->getPointOfInstantiation());
 596
 597     if (D->isCanonicalDecl()) {
 598       // Write the template that contains the specializations set. We will
 599       // add a FunctionTemplateSpecializationInfo to it when reading.
 600       Record.AddDeclRef(FTSInfo->getTemplate()->getCanonicalDecl());
 601     }
 602     break;
 603   }
 604   case FunctionDecl::TK_DependentFunctionTemplateSpecialization: {
 605     DependentFunctionTemplateSpecializationInfo *
 606       DFTSInfo = D->getDependentSpecializationInfo();
 607
 608     // Templates.
 609     Record.push_back(DFTSInfo->getNumTemplates());
 610     for (int i=0, e = DFTSInfo->getNumTemplates(); i != e; ++i)
 611       Record.AddDeclRef(DFTSInfo->getTemplate(i));
 612
 613     // Templates args.
 614     Record.push_back(DFTSInfo->getNumTemplateArgs());
 615     for (int i=0, e = DFTSInfo->getNumTemplateArgs(); i != e; ++i)
 616       Record.AddTemplateArgumentLoc(DFTSInfo->getTemplateArg(i));
 617     Record.AddSourceLocation(DFTSInfo->getLAngleLoc());
 618     Record.AddSourceLocation(DFTSInfo->getRAngleLoc());
 619     break;
 620   }
 621   }
 622
 623   Record.push_back(D->param_size());
 624   for (auto P : D->parameters())
 625     Record.AddDeclRef(P);
 626   Code = serialization::DECL_FUNCTION;
 627 }
 628
 629 void ASTDeclWriter::VisitCXXDeductionGuideDecl(CXXDeductionGuideDecl *D) {
 630   VisitFunctionDecl(D);
 631   Record.push_back(D->IsCopyDeductionCandidate);
 632   Code = serialization::DECL_CXX_DEDUCTION_GUIDE;
 633 }
 634
 635 void ASTDeclWriter::VisitObjCMethodDecl(ObjCMethodDecl *D) {
 636   VisitNamedDecl(D);
 637   // FIXME: convert to LazyStmtPtr?
 638   // Unlike C/C++, method bodies will never be in header files.
 639   bool HasBodyStuff = D->getBody() != nullptr     ||
 640                       D->getSelfDecl() != nullptr || D->getCmdDecl() != nullptr;
 641   Record.push_back(HasBodyStuff);
 642   if (HasBodyStuff) {
 643     Record.AddStmt(D->getBody());
 644     Record.AddDeclRef(D->getSelfDecl());
 645     Record.AddDeclRef(D->getCmdDecl());
 646   }
 647   Record.push_back(D->isInstanceMethod());
 648   Record.push_back(D->isVariadic());
 649   Record.push_back(D->isPropertyAccessor());
 650   Record.push_back(D->isDefined());
 651   Record.push_back(D->IsOverriding);
 652   Record.push_back(D->HasSkippedBody);
 653
 654   Record.push_back(D->IsRedeclaration);
 655   Record.push_back(D->HasRedeclaration);
 656   if (D->HasRedeclaration) {
 657     assert(Context.getObjCMethodRedeclaration(D));
 658     Record.AddDeclRef(Context.getObjCMethodRedeclaration(D));
 659   }
 660
 661   // FIXME: stable encoding for @required/@optional
 662   Record.push_back(D->getImplementationControl());
 663   // FIXME: stable encoding for in/out/inout/bycopy/byref/oneway/nullability
 664   Record.push_back(D->getObjCDeclQualifier());
 665   Record.push_back(D->hasRelatedResultType());
 666   Record.AddTypeRef(D->getReturnType());
 667   Record.AddTypeSourceInfo(D->getReturnTypeSourceInfo());
 668   Record.AddSourceLocation(D->getLocEnd());
 669   Record.push_back(D->param_size());
 670   for (const auto *P : D->parameters())
 671     Record.AddDeclRef(P);
 672
 673   Record.push_back(D->SelLocsKind);
 674   unsigned NumStoredSelLocs = D->getNumStoredSelLocs();
 675   SourceLocation *SelLocs = D->getStoredSelLocs();
 676   Record.push_back(NumStoredSelLocs);
 677   for (unsigned i = 0; i != NumStoredSelLocs; ++i)
 678     Record.AddSourceLocation(SelLocs[i]);
 679
 680   Code = serialization::DECL_OBJC_METHOD;
 681 }
 682
 683 void ASTDeclWriter::VisitObjCTypeParamDecl(ObjCTypeParamDecl *D) {
 684   VisitTypedefNameDecl(D);
 685   Record.push_back(D->Variance);
 686   Record.push_back(D->Index);
 687   Record.AddSourceLocation(D->VarianceLoc);
 688   Record.AddSourceLocation(D->ColonLoc);
 689
 690   Code = serialization::DECL_OBJC_TYPE_PARAM;
 691 }
 692
 693 void ASTDeclWriter::VisitObjCContainerDecl(ObjCContainerDecl *D) {
 694   VisitNamedDecl(D);
 695   Record.AddSourceLocation(D->getAtStartLoc());
 696   Record.AddSourceRange(D->getAtEndRange());
 697   // Abstract class (no need to define a stable serialization::DECL code).
 698 }
 699
 700 void ASTDeclWriter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *D) {
 701   VisitRedeclarable(D);
 702   VisitObjCContainerDecl(D);
 703   Record.AddTypeRef(QualType(D->getTypeForDecl(), 0));
 704   AddObjCTypeParamList(D->TypeParamList);
 705
 706   Record.push_back(D->isThisDeclarationADefinition());
 707   if (D->isThisDeclarationADefinition()) {
 708     // Write the DefinitionData
 709     ObjCInterfaceDecl::DefinitionData &Data = D->data();
 710
 711     Record.AddTypeSourceInfo(D->getSuperClassTInfo());
 712     Record.AddSourceLocation(D->getEndOfDefinitionLoc());
 713     Record.push_back(Data.HasDesignatedInitializers);
 714
 715     // Write out the protocols that are directly referenced by the @interface.
 716     Record.push_back(Data.ReferencedProtocols.size());
 717     for (const auto *P : D->protocols())
 718       Record.AddDeclRef(P);
 719     for (const auto &PL : D->protocol_locs())
 720       Record.AddSourceLocation(PL);
 721
 722     // Write out the protocols that are transitively referenced.
 723     Record.push_back(Data.AllReferencedProtocols.size());
 724     for (ObjCList<ObjCProtocolDecl>::iterator
 725               P = Data.AllReferencedProtocols.begin(),
 726            PEnd = Data.AllReferencedProtocols.end();
 727          P != PEnd; ++P)
 728       Record.AddDeclRef(*P);
 729
 730
 731     if (ObjCCategoryDecl *Cat = D->getCategoryListRaw()) {
 732       // Ensure that we write out the set of categories for this class.
 733       Writer.ObjCClassesWithCategories.insert(D);
 734
 735       // Make sure that the categories get serialized.
 736       for (; Cat; Cat = Cat->getNextClassCategoryRaw())
 737         (void)Writer.GetDeclRef(Cat);
 738     }
 739   }
 740
 741   Code = serialization::DECL_OBJC_INTERFACE;
 742 }
 743
 744 void ASTDeclWriter::VisitObjCIvarDecl(ObjCIvarDecl *D) {
 745   VisitFieldDecl(D);
 746   // FIXME: stable encoding for @public/@private/@protected/@package
 747   Record.push_back(D->getAccessControl());
 748   Record.push_back(D->getSynthesize());
 749
 750   if (D->getDeclContext() == D->getLexicalDeclContext() &&
 751       !D->hasAttrs() &&
 752       !D->isImplicit() &&
 753       !D->isUsed(false) &&
 754       !D->isInvalidDecl() &&
 755       !D->isReferenced() &&
 756       !D->isModulePrivate() &&
 757       !D->getBitWidth() &&
 758       !D->hasExtInfo() &&
 759       D->getDeclName())
 760     AbbrevToUse = Writer.getDeclObjCIvarAbbrev();
 761
 762   Code = serialization::DECL_OBJC_IVAR;
 763 }
 764
 765 void ASTDeclWriter::VisitObjCProtocolDecl(ObjCProtocolDecl *D) {
 766   VisitRedeclarable(D);
 767   VisitObjCContainerDecl(D);
 768
 769   Record.push_back(D->isThisDeclarationADefinition());
 770   if (D->isThisDeclarationADefinition()) {
 771     Record.push_back(D->protocol_size());
 772     for (const auto *I : D->protocols())
 773       Record.AddDeclRef(I);
 774     for (const auto &PL : D->protocol_locs())
 775       Record.AddSourceLocation(PL);
 776   }
 777
 778   Code = serialization::DECL_OBJC_PROTOCOL;
 779 }
 780
 781 void ASTDeclWriter::VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D) {
 782   VisitFieldDecl(D);
 783   Code = serialization::DECL_OBJC_AT_DEFS_FIELD;
 784 }
 785
 786 void ASTDeclWriter::VisitObjCCategoryDecl(ObjCCategoryDecl *D) {
 787   VisitObjCContainerDecl(D);
 788   Record.AddSourceLocation(D->getCategoryNameLoc());
 789   Record.AddSourceLocation(D->getIvarLBraceLoc());
 790   Record.AddSourceLocation(D->getIvarRBraceLoc());
 791   Record.AddDeclRef(D->getClassInterface());
 792   AddObjCTypeParamList(D->TypeParamList);
 793   Record.push_back(D->protocol_size());
 794   for (const auto *I : D->protocols())
 795     Record.AddDeclRef(I);
 796   for (const auto &PL : D->protocol_locs())
 797     Record.AddSourceLocation(PL);
 798   Code = serialization::DECL_OBJC_CATEGORY;
 799 }
 800
 801 void ASTDeclWriter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D) {
 802   VisitNamedDecl(D);
 803   Record.AddDeclRef(D->getClassInterface());
 804   Code = serialization::DECL_OBJC_COMPATIBLE_ALIAS;
 805 }
 806
 807 void ASTDeclWriter::VisitObjCPropertyDecl(ObjCPropertyDecl *D) {
 808   VisitNamedDecl(D);
 809   Record.AddSourceLocation(D->getAtLoc());
 810   Record.AddSourceLocation(D->getLParenLoc());
 811   Record.AddTypeRef(D->getType());
 812   Record.AddTypeSourceInfo(D->getTypeSourceInfo());
 813   // FIXME: stable encoding
 814   Record.push_back((unsigned)D->getPropertyAttributes());
 815   Record.push_back((unsigned)D->getPropertyAttributesAsWritten());
 816   // FIXME: stable encoding
 817   Record.push_back((unsigned)D->getPropertyImplementation());
 818   Record.AddDeclarationName(D->getGetterName());
 819   Record.AddSourceLocation(D->getGetterNameLoc());
 820   Record.AddDeclarationName(D->getSetterName());
 821   Record.AddSourceLocation(D->getSetterNameLoc());
 822   Record.AddDeclRef(D->getGetterMethodDecl());
 823   Record.AddDeclRef(D->getSetterMethodDecl());
 824   Record.AddDeclRef(D->getPropertyIvarDecl());
 825   Code = serialization::DECL_OBJC_PROPERTY;
 826 }
 827
 828 void ASTDeclWriter::VisitObjCImplDecl(ObjCImplDecl *D) {
 829   VisitObjCContainerDecl(D);
 830   Record.AddDeclRef(D->getClassInterface());
 831   // Abstract class (no need to define a stable serialization::DECL code).
 832 }
 833
 834 void ASTDeclWriter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D) {
 835   VisitObjCImplDecl(D);
 836   Record.AddSourceLocation(D->getCategoryNameLoc());
 837   Code = serialization::DECL_OBJC_CATEGORY_IMPL;
 838 }
 839
 840 void ASTDeclWriter::VisitObjCImplementationDecl(ObjCImplementationDecl *D) {
 841   VisitObjCImplDecl(D);
 842   Record.AddDeclRef(D->getSuperClass());
 843   Record.AddSourceLocation(D->getSuperClassLoc());
 844   Record.AddSourceLocation(D->getIvarLBraceLoc());
 845   Record.AddSourceLocation(D->getIvarRBraceLoc());
 846   Record.push_back(D->hasNonZeroConstructors());
 847   Record.push_back(D->hasDestructors());
 848   Record.push_back(D->NumIvarInitializers);
 849   if (D->NumIvarInitializers)
 850     Record.AddCXXCtorInitializers(
 851         llvm::makeArrayRef(D->init_begin(), D->init_end()));
 852   Code = serialization::DECL_OBJC_IMPLEMENTATION;
 853 }
 854
 855 void ASTDeclWriter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D) {
 856   VisitDecl(D);
 857   Record.AddSourceLocation(D->getLocStart());
 858   Record.AddDeclRef(D->getPropertyDecl());
 859   Record.AddDeclRef(D->getPropertyIvarDecl());
 860   Record.AddSourceLocation(D->getPropertyIvarDeclLoc());
 861   Record.AddStmt(D->getGetterCXXConstructor());
 862   Record.AddStmt(D->getSetterCXXAssignment());
 863   Code = serialization::DECL_OBJC_PROPERTY_IMPL;
 864 }
 865
 866 void ASTDeclWriter::VisitFieldDecl(FieldDecl *D) {
 867   VisitDeclaratorDecl(D);
 868   Record.push_back(D->isMutable());
 869
 870   FieldDecl::InitStorageKind ISK = D->InitStorage.getInt();
 871   Record.push_back(ISK);
 872   if (ISK == FieldDecl::ISK_CapturedVLAType)
 873     Record.AddTypeRef(QualType(D->getCapturedVLAType(), 0));
 874   else if (ISK)
 875     Record.AddStmt(D->getInClassInitializer());
 876
 877   Record.AddStmt(D->getBitWidth());
 878
 879   if (!D->getDeclName())
 880     Record.AddDeclRef(Context.getInstantiatedFromUnnamedFieldDecl(D));
 881
 882   if (D->getDeclContext() == D->getLexicalDeclContext() &&
 883       !D->hasAttrs() &&
 884       !D->isImplicit() &&
 885       !D->isUsed(false) &&
 886       !D->isInvalidDecl() &&
 887       !D->isReferenced() &&
 888       !D->isTopLevelDeclInObjCContainer() &&
 889       !D->isModulePrivate() &&
 890       !D->getBitWidth() &&
 891       !D->hasInClassInitializer() &&
 892       !D->hasCapturedVLAType() &&
 893       !D->hasExtInfo() &&
 894       !ObjCIvarDecl::classofKind(D->getKind()) &&
 895       !ObjCAtDefsFieldDecl::classofKind(D->getKind()) &&
 896       D->getDeclName())
 897     AbbrevToUse = Writer.getDeclFieldAbbrev();
 898
 899   Code = serialization::DECL_FIELD;
 900 }
 901
 902 void ASTDeclWriter::VisitMSPropertyDecl(MSPropertyDecl *D) {
 903   VisitDeclaratorDecl(D);
 904   Record.AddIdentifierRef(D->getGetterId());
 905   Record.AddIdentifierRef(D->getSetterId());
 906   Code = serialization::DECL_MS_PROPERTY;
 907 }
 908
 909 void ASTDeclWriter::VisitIndirectFieldDecl(IndirectFieldDecl *D) {
 910   VisitValueDecl(D);
 911   Record.push_back(D->getChainingSize());
 912
 913   for (const auto *P : D->chain())
 914     Record.AddDeclRef(P);
 915   Code = serialization::DECL_INDIRECTFIELD;
 916 }
 917
 918 void ASTDeclWriter::VisitVarDecl(VarDecl *D) {
 919   VisitRedeclarable(D);
 920   VisitDeclaratorDecl(D);
 921   Record.push_back(D->getStorageClass());
 922   Record.push_back(D->getTSCSpec());
 923   Record.push_back(D->getInitStyle());
 924   if (!isa<ParmVarDecl>(D)) {
 925     Record.push_back(D->isThisDeclarationADemotedDefinition());
 926     Record.push_back(D->isExceptionVariable());
 927     Record.push_back(D->isNRVOVariable());
 928     Record.push_back(D->isCXXForRangeDecl());
 929     Record.push_back(D->isObjCForDecl());
 930     Record.push_back(D->isARCPseudoStrong());
 931     Record.push_back(D->isInline());
 932     Record.push_back(D->isInlineSpecified());
 933     Record.push_back(D->isConstexpr());
 934     Record.push_back(D->isInitCapture());
 935     Record.push_back(D->isPreviousDeclInSameBlockScope());
 936     if (const auto *IPD = dyn_cast<ImplicitParamDecl>(D))
 937       Record.push_back(static_cast<unsigned>(IPD->getParameterKind()));
 938     else
 939       Record.push_back(0);
 940   }
 941   Record.push_back(D->getLinkageInternal());
 942
 943   if (D->getInit()) {
 944     Record.push_back(!D->isInitKnownICE() ? 1 : (D->isInitICE() ? 3 : 2));
 945     Record.AddStmt(D->getInit());
 946   } else {
 947     Record.push_back(0);
 948   }
 949
 950   if (D->getStorageDuration() == SD_Static) {
 951     bool ModulesCodegen = false;
 952     if (Writer.WritingModule &&
 953         !D->getDescribedVarTemplate() && !D->getMemberSpecializationInfo() &&
 954         !isa<VarTemplateSpecializationDecl>(D)) {
 955       // When building a C++ Modules TS module interface unit, a strong
 956       // definition in the module interface is provided by the compilation of
 957       // that module interface unit, not by its users. (Inline variables are
 958       // still emitted in module users.)
 959       ModulesCodegen =
 960           (Writer.WritingModule->Kind == Module::ModuleInterfaceUnit &&
 961            Writer.Context->GetGVALinkageForVariable(D) == GVA_StrongExternal);
 962     }
 963     Record.push_back(ModulesCodegen);
 964     if (ModulesCodegen)
 965       Writer.ModularCodegenDecls.push_back(Writer.GetDeclRef(D));
 966   }
 967
 968   enum {
 969     VarNotTemplate = 0, VarTemplate, StaticDataMemberSpecialization
 970   };
 971   if (VarTemplateDecl *TemplD = D->getDescribedVarTemplate()) {
 972     Record.push_back(VarTemplate);
 973     Record.AddDeclRef(TemplD);
 974   } else if (MemberSpecializationInfo *SpecInfo
 975                = D->getMemberSpecializationInfo()) {
 976     Record.push_back(StaticDataMemberSpecialization);
 977     Record.AddDeclRef(SpecInfo->getInstantiatedFrom());
 978     Record.push_back(SpecInfo->getTemplateSpecializationKind());
 979     Record.AddSourceLocation(SpecInfo->getPointOfInstantiation());
 980   } else {
 981     Record.push_back(VarNotTemplate);
 982   }
 983
 984   if (D->getDeclContext() == D->getLexicalDeclContext() &&
 985       !D->hasAttrs() &&
 986       !D->isImplicit() &&
 987       !D->isUsed(false) &&
 988       !D->isInvalidDecl() &&
 989       !D->isReferenced() &&
 990       !D->isTopLevelDeclInObjCContainer() &&
 991       D->getAccess() == AS_none &&
 992       !D->isModulePrivate() &&
 993       !needsAnonymousDeclarationNumber(D) &&
 994       D->getDeclName().getNameKind() == DeclarationName::Identifier &&
 995       !D->hasExtInfo() &&
 996       D->getFirstDecl() == D->getMostRecentDecl() &&
 997       D->getKind() == Decl::Var &&
 998       !D->isInline() &&
 999       !D->isConstexpr() &&
1000       !D->isInitCapture() &&
1001       !D->isPreviousDeclInSameBlockScope() &&
1002       D->getStorageDuration() != SD_Static &&
1003       !D->getMemberSpecializationInfo())
1004     AbbrevToUse = Writer.getDeclVarAbbrev();
1005
1006   Code = serialization::DECL_VAR;
1007 }
1008
1009 void ASTDeclWriter::VisitImplicitParamDecl(ImplicitParamDecl *D) {
1010   VisitVarDecl(D);
1011   Code = serialization::DECL_IMPLICIT_PARAM;
1012 }
1013
1014 void ASTDeclWriter::VisitParmVarDecl(ParmVarDecl *D) {
1015   VisitVarDecl(D);
1016   Record.push_back(D->isObjCMethodParameter());
1017   Record.push_back(D->getFunctionScopeDepth());
1018   Record.push_back(D->getFunctionScopeIndex());
1019   Record.push_back(D->getObjCDeclQualifier()); // FIXME: stable encoding
1020   Record.push_back(D->isKNRPromoted());
1021   Record.push_back(D->hasInheritedDefaultArg());
1022   Record.push_back(D->hasUninstantiatedDefaultArg());
1023   if (D->hasUninstantiatedDefaultArg())
1024     Record.AddStmt(D->getUninstantiatedDefaultArg());
1025   Code = serialization::DECL_PARM_VAR;
1026
1027   assert(!D->isARCPseudoStrong()); // can be true of ImplicitParamDecl
1028
1029   // If the assumptions about the DECL_PARM_VAR abbrev are true, use it.  Here
1030   // we dynamically check for the properties that we optimize for, but don't
1031   // know are true of all PARM_VAR_DECLs.
1032   if (D->getDeclContext() == D->getLexicalDeclContext() &&
1033       !D->hasAttrs() &&
1034       !D->hasExtInfo() &&
1035       !D->isImplicit() &&
1036       !D->isUsed(false) &&
1037       !D->isInvalidDecl() &&
1038       !D->isReferenced() &&
1039       D->getAccess() == AS_none &&
1040       !D->isModulePrivate() &&
1041       D->getStorageClass() == 0 &&
1042       D->getInitStyle() == VarDecl::CInit && // Can params have anything else?
1043       D->getFunctionScopeDepth() == 0 &&
1044       D->getObjCDeclQualifier() == 0 &&
1045       !D->isKNRPromoted() &&
1046       !D->hasInheritedDefaultArg() &&
1047       D->getInit() == nullptr &&
1048       !D->hasUninstantiatedDefaultArg())  // No default expr.
1049     AbbrevToUse = Writer.getDeclParmVarAbbrev();
1050
1051   // Check things we know are true of *every* PARM_VAR_DECL, which is more than
1052   // just us assuming it.
1053   assert(!D->getTSCSpec() && "PARM_VAR_DECL can't use TLS");
1054   assert(!D->isThisDeclarationADemotedDefinition()
1055          && "PARM_VAR_DECL can't be demoted definition.");
1056   assert(D->getAccess() == AS_none && "PARM_VAR_DECL can't be public/private");
1057   assert(!D->isExceptionVariable() && "PARM_VAR_DECL can't be exception var");
1058   assert(D->getPreviousDecl() == nullptr && "PARM_VAR_DECL can't be redecl");
1059   assert(!D->isStaticDataMember() &&
1060          "PARM_VAR_DECL can't be static data member");
1061 }
1062
1063 void ASTDeclWriter::VisitDecompositionDecl(DecompositionDecl *D) {
1064   // Record the number of bindings first to simplify deserialization.
1065   Record.push_back(D->bindings().size());
1066
1067   VisitVarDecl(D);
1068   for (auto *B : D->bindings())
1069     Record.AddDeclRef(B);
1070   Code = serialization::DECL_DECOMPOSITION;
1071 }
1072
1073 void ASTDeclWriter::VisitBindingDecl(BindingDecl *D) {
1074   VisitValueDecl(D);
1075   Record.AddStmt(D->getBinding());
1076   Code = serialization::DECL_BINDING;
1077 }
1078
1079 void ASTDeclWriter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
1080   VisitDecl(D);
1081   Record.AddStmt(D->getAsmString());
1082   Record.AddSourceLocation(D->getRParenLoc());
1083   Code = serialization::DECL_FILE_SCOPE_ASM;
1084 }
1085
1086 void ASTDeclWriter::VisitEmptyDecl(EmptyDecl *D) {
1087   VisitDecl(D);
1088   Code = serialization::DECL_EMPTY;
1089 }
1090
1091 void ASTDeclWriter::VisitBlockDecl(BlockDecl *D) {
1092   VisitDecl(D);
1093   Record.AddStmt(D->getBody());
1094   Record.AddTypeSourceInfo(D->getSignatureAsWritten());
1095   Record.push_back(D->param_size());
1096   for (ParmVarDecl *P : D->parameters())
1097     Record.AddDeclRef(P);
1098   Record.push_back(D->isVariadic());
1099   Record.push_back(D->blockMissingReturnType());
1100   Record.push_back(D->isConversionFromLambda());
1101   Record.push_back(D->capturesCXXThis());
1102   Record.push_back(D->getNumCaptures());
1103   for (const auto &capture : D->captures()) {
1104     Record.AddDeclRef(capture.getVariable());
1105
1106     unsigned flags = 0;
1107     if (capture.isByRef()) flags |= 1;
1108     if (capture.isNested()) flags |= 2;
1109     if (capture.hasCopyExpr()) flags |= 4;
1110     Record.push_back(flags);
1111
1112     if (capture.hasCopyExpr()) Record.AddStmt(capture.getCopyExpr());
1113   }
1114
1115   Code = serialization::DECL_BLOCK;
1116 }
1117
1118 void ASTDeclWriter::VisitCapturedDecl(CapturedDecl *CD) {
1119   Record.push_back(CD->getNumParams());
1120   VisitDecl(CD);
1121   Record.push_back(CD->getContextParamPosition());
1122   Record.push_back(CD->isNothrow() ? 1 : 0);
1123   // Body is stored by VisitCapturedStmt.
1124   for (unsigned I = 0; I < CD->getNumParams(); ++I)
1125     Record.AddDeclRef(CD->getParam(I));
1126   Code = serialization::DECL_CAPTURED;
1127 }
1128
1129 void ASTDeclWriter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
1130   VisitDecl(D);
1131   Record.push_back(D->getLanguage());
1132   Record.AddSourceLocation(D->getExternLoc());
1133   Record.AddSourceLocation(D->getRBraceLoc());
1134   Code = serialization::DECL_LINKAGE_SPEC;
1135 }
1136
1137 void ASTDeclWriter::VisitExportDecl(ExportDecl *D) {
1138   VisitDecl(D);
1139   Record.AddSourceLocation(D->getRBraceLoc());
1140   Code = serialization::DECL_EXPORT;
1141 }
1142
1143 void ASTDeclWriter::VisitLabelDecl(LabelDecl *D) {
1144   VisitNamedDecl(D);
1145   Record.AddSourceLocation(D->getLocStart());
1146   Code = serialization::DECL_LABEL;
1147 }
1148
1149
1150 void ASTDeclWriter::VisitNamespaceDecl(NamespaceDecl *D) {
1151   VisitRedeclarable(D);
1152   VisitNamedDecl(D);
1153   Record.push_back(D->isInline());
1154   Record.AddSourceLocation(D->getLocStart());
1155   Record.AddSourceLocation(D->getRBraceLoc());
1156
1157   if (D->isOriginalNamespace())
1158     Record.AddDeclRef(D->getAnonymousNamespace());
1159   Code = serialization::DECL_NAMESPACE;
1160
1161   if (Writer.hasChain() && D->isAnonymousNamespace() &&
1162       D == D->getMostRecentDecl()) {
1163     // This is a most recent reopening of the anonymous namespace. If its parent
1164     // is in a previous PCH (or is the TU), mark that parent for update, because
1165     // the original namespace always points to the latest re-opening of its
1166     // anonymous namespace.
1167     Decl *Parent = cast<Decl>(
1168         D->getParent()->getRedeclContext()->getPrimaryContext());
1169     if (Parent->isFromASTFile() || isa<TranslationUnitDecl>(Parent)) {
1170       Writer.DeclUpdates[Parent].push_back(
1171           ASTWriter::DeclUpdate(UPD_CXX_ADDED_ANONYMOUS_NAMESPACE, D));
1172     }
1173   }
1174 }
1175
1176 void ASTDeclWriter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
1177   VisitRedeclarable(D);
1178   VisitNamedDecl(D);
1179   Record.AddSourceLocation(D->getNamespaceLoc());
1180   Record.AddSourceLocation(D->getTargetNameLoc());
1181   Record.AddNestedNameSpecifierLoc(D->getQualifierLoc());
1182   Record.AddDeclRef(D->getNamespace());
1183   Code = serialization::DECL_NAMESPACE_ALIAS;
1184 }
1185
1186 void ASTDeclWriter::VisitUsingDecl(UsingDecl *D) {
1187   VisitNamedDecl(D);
1188   Record.AddSourceLocation(D->getUsingLoc());
1189   Record.AddNestedNameSpecifierLoc(D->getQualifierLoc());
1190   Record.AddDeclarationNameLoc(D->DNLoc, D->getDeclName());
1191   Record.AddDeclRef(D->FirstUsingShadow.getPointer());
1192   Record.push_back(D->hasTypename());
1193   Record.AddDeclRef(Context.getInstantiatedFromUsingDecl(D));
1194   Code = serialization::DECL_USING;
1195 }
1196
1197 void ASTDeclWriter::VisitUsingPackDecl(UsingPackDecl *D) {
1198   Record.push_back(D->NumExpansions);
1199   VisitNamedDecl(D);
1200   Record.AddDeclRef(D->getInstantiatedFromUsingDecl());
1201   for (auto *E : D->expansions())
1202     Record.AddDeclRef(E);
1203   Code = serialization::DECL_USING_PACK;
1204 }
1205
1206 void ASTDeclWriter::VisitUsingShadowDecl(UsingShadowDecl *D) {
1207   VisitRedeclarable(D);
1208   VisitNamedDecl(D);
1209   Record.AddDeclRef(D->getTargetDecl());
1210   Record.push_back(D->getIdentifierNamespace());
1211   Record.AddDeclRef(D->UsingOrNextShadow);
1212   Record.AddDeclRef(Context.getInstantiatedFromUsingShadowDecl(D));
1213   Code = serialization::DECL_USING_SHADOW;
1214 }
1215
1216 void ASTDeclWriter::VisitConstructorUsingShadowDecl(
1217     ConstructorUsingShadowDecl *D) {
1218   VisitUsingShadowDecl(D);
1219   Record.AddDeclRef(D->NominatedBaseClassShadowDecl);
1220   Record.AddDeclRef(D->ConstructedBaseClassShadowDecl);
1221   Record.push_back(D->IsVirtual);
1222   Code = serialization::DECL_CONSTRUCTOR_USING_SHADOW;
1223 }
1224
1225 void ASTDeclWriter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
1226   VisitNamedDecl(D);
1227   Record.AddSourceLocation(D->getUsingLoc());
1228   Record.AddSourceLocation(D->getNamespaceKeyLocation());
1229   Record.AddNestedNameSpecifierLoc(D->getQualifierLoc());
1230   Record.AddDeclRef(D->getNominatedNamespace());
1231   Record.AddDeclRef(dyn_cast<Decl>(D->getCommonAncestor()));
1232   Code = serialization::DECL_USING_DIRECTIVE;
1233 }
1234
1235 void ASTDeclWriter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
1236   VisitValueDecl(D);
1237   Record.AddSourceLocation(D->getUsingLoc());
1238   Record.AddNestedNameSpecifierLoc(D->getQualifierLoc());
1239   Record.AddDeclarationNameLoc(D->DNLoc, D->getDeclName());
1240   Record.AddSourceLocation(D->getEllipsisLoc());
1241   Code = serialization::DECL_UNRESOLVED_USING_VALUE;
1242 }
1243
1244 void ASTDeclWriter::VisitUnresolvedUsingTypenameDecl(
1245                                                UnresolvedUsingTypenameDecl *D) {
1246   VisitTypeDecl(D);
1247   Record.AddSourceLocation(D->getTypenameLoc());
1248   Record.AddNestedNameSpecifierLoc(D->getQualifierLoc());
1249   Record.AddSourceLocation(D->getEllipsisLoc());
1250   Code = serialization::DECL_UNRESOLVED_USING_TYPENAME;
1251 }
1252
1253 void ASTDeclWriter::VisitCXXRecordDecl(CXXRecordDecl *D) {
1254   VisitRecordDecl(D);
1255
1256   enum {
1257     CXXRecNotTemplate = 0, CXXRecTemplate, CXXRecMemberSpecialization
1258   };
1259   if (ClassTemplateDecl *TemplD = D->getDescribedClassTemplate()) {
1260     Record.push_back(CXXRecTemplate);
1261     Record.AddDeclRef(TemplD);
1262   } else if (MemberSpecializationInfo *MSInfo
1263                = D->getMemberSpecializationInfo()) {
1264     Record.push_back(CXXRecMemberSpecialization);
1265     Record.AddDeclRef(MSInfo->getInstantiatedFrom());
1266     Record.push_back(MSInfo->getTemplateSpecializationKind());
1267     Record.AddSourceLocation(MSInfo->getPointOfInstantiation());
1268   } else {
1269     Record.push_back(CXXRecNotTemplate);
1270   }
1271
1272   Record.push_back(D->isThisDeclarationADefinition());
1273   if (D->isThisDeclarationADefinition())
1274     Record.AddCXXDefinitionData(D);
1275
1276   // Store (what we currently believe to be) the key function to avoid
1277   // deserializing every method so we can compute it.
1278   if (D->IsCompleteDefinition)
1279     Record.AddDeclRef(Context.getCurrentKeyFunction(D));
1280
1281   Code = serialization::DECL_CXX_RECORD;
1282 }
1283
1284 void ASTDeclWriter::VisitCXXMethodDecl(CXXMethodDecl *D) {
1285   VisitFunctionDecl(D);
1286   if (D->isCanonicalDecl()) {
1287     Record.push_back(D->size_overridden_methods());
1288     for (const CXXMethodDecl *MD : D->overridden_methods())
1289       Record.AddDeclRef(MD);
1290   } else {
1291     // We only need to record overridden methods once for the canonical decl.
1292     Record.push_back(0);
1293   }
1294
1295   if (D->getDeclContext() == D->getLexicalDeclContext() &&
1296       D->getFirstDecl() == D->getMostRecentDecl() &&
1297       !D->isInvalidDecl() &&
1298       !D->hasAttrs() &&
1299       !D->isTopLevelDeclInObjCContainer() &&
1300       D->getDeclName().getNameKind() == DeclarationName::Identifier &&
1301       !D->hasExtInfo() &&
1302       !D->hasInheritedPrototype() &&
1303       D->hasWrittenPrototype())
1304     AbbrevToUse = Writer.getDeclCXXMethodAbbrev();
1305
1306   Code = serialization::DECL_CXX_METHOD;
1307 }
1308
1309 void ASTDeclWriter::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
1310   if (auto Inherited = D->getInheritedConstructor()) {
1311     Record.AddDeclRef(Inherited.getShadowDecl());
1312     Record.AddDeclRef(Inherited.getConstructor());
1313     Code = serialization::DECL_CXX_INHERITED_CONSTRUCTOR;
1314   } else {
1315     Code = serialization::DECL_CXX_CONSTRUCTOR;
1316   }
1317
1318   VisitCXXMethodDecl(D);
1319
1320   Code = D->isInheritingConstructor()
1321              ? serialization::DECL_CXX_INHERITED_CONSTRUCTOR
1322              : serialization::DECL_CXX_CONSTRUCTOR;
1323 }
1324
1325 void ASTDeclWriter::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
1326   VisitCXXMethodDecl(D);
1327
1328   Record.AddDeclRef(D->getOperatorDelete());
1329   if (D->getOperatorDelete())
1330     Record.AddStmt(D->getOperatorDeleteThisArg());
1331
1332   Code = serialization::DECL_CXX_DESTRUCTOR;
1333 }
1334
1335 void ASTDeclWriter::VisitCXXConversionDecl(CXXConversionDecl *D) {
1336   VisitCXXMethodDecl(D);
1337   Code = serialization::DECL_CXX_CONVERSION;
1338 }
1339
1340 void ASTDeclWriter::VisitImportDecl(ImportDecl *D) {
1341   VisitDecl(D);
1342   Record.push_back(Writer.getSubmoduleID(D->getImportedModule()));
1343   ArrayRef<SourceLocation> IdentifierLocs = D->getIdentifierLocs();
1344   Record.push_back(!IdentifierLocs.empty());
1345   if (IdentifierLocs.empty()) {
1346     Record.AddSourceLocation(D->getLocEnd());
1347     Record.push_back(1);
1348   } else {
1349     for (unsigned I = 0, N = IdentifierLocs.size(); I != N; ++I)
1350       Record.AddSourceLocation(IdentifierLocs[I]);
1351     Record.push_back(IdentifierLocs.size());
1352   }
1353   // Note: the number of source locations must always be the last element in
1354   // the record.
1355   Code = serialization::DECL_IMPORT;
1356 }
1357
1358 void ASTDeclWriter::VisitAccessSpecDecl(AccessSpecDecl *D) {
1359   VisitDecl(D);
1360   Record.AddSourceLocation(D->getColonLoc());
1361   Code = serialization::DECL_ACCESS_SPEC;
1362 }
1363
1364 void ASTDeclWriter::VisitFriendDecl(FriendDecl *D) {
1365   // Record the number of friend type template parameter lists here
1366   // so as to simplify memory allocation during deserialization.
1367   Record.push_back(D->NumTPLists);
1368   VisitDecl(D);
1369   bool hasFriendDecl = D->Friend.is<NamedDecl*>();
1370   Record.push_back(hasFriendDecl);
1371   if (hasFriendDecl)
1372     Record.AddDeclRef(D->getFriendDecl());
1373   else
1374     Record.AddTypeSourceInfo(D->getFriendType());
1375   for (unsigned i = 0; i < D->NumTPLists; ++i)
1376     Record.AddTemplateParameterList(D->getFriendTypeTemplateParameterList(i));
1377   Record.AddDeclRef(D->getNextFriend());
1378   Record.push_back(D->UnsupportedFriend);
1379   Record.AddSourceLocation(D->FriendLoc);
1380   Code = serialization::DECL_FRIEND;
1381 }
1382
1383 void ASTDeclWriter::VisitFriendTemplateDecl(FriendTemplateDecl *D) {
1384   VisitDecl(D);
1385   Record.push_back(D->getNumTemplateParameters());
1386   for (unsigned i = 0, e = D->getNumTemplateParameters(); i != e; ++i)
1387     Record.AddTemplateParameterList(D->getTemplateParameterList(i));
1388   Record.push_back(D->getFriendDecl() != nullptr);
1389   if (D->getFriendDecl())
1390     Record.AddDeclRef(D->getFriendDecl());
1391   else
1392     Record.AddTypeSourceInfo(D->getFriendType());
1393   Record.AddSourceLocation(D->getFriendLoc());
1394   Code = serialization::DECL_FRIEND_TEMPLATE;
1395 }
1396
1397 void ASTDeclWriter::VisitTemplateDecl(TemplateDecl *D) {
1398   VisitNamedDecl(D);
1399
1400   Record.AddDeclRef(D->getTemplatedDecl());
1401   Record.AddTemplateParameterList(D->getTemplateParameters());
1402 }
1403
1404 void ASTDeclWriter::VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D) {
1405   VisitRedeclarable(D);
1406
1407   // Emit data to initialize CommonOrPrev before VisitTemplateDecl so that
1408   // getCommonPtr() can be used while this is still initializing.
1409   if (D->isFirstDecl()) {
1410     // This declaration owns the 'common' pointer, so serialize that data now.
1411     Record.AddDeclRef(D->getInstantiatedFromMemberTemplate());
1412     if (D->getInstantiatedFromMemberTemplate())
1413       Record.push_back(D->isMemberSpecialization());
1414   }
1415
1416   VisitTemplateDecl(D);
1417   Record.push_back(D->getIdentifierNamespace());
1418 }
1419
1420 void ASTDeclWriter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1421   VisitRedeclarableTemplateDecl(D);
1422
1423   if (D->isFirstDecl())
1424     AddTemplateSpecializations(D);
1425   Code = serialization::DECL_CLASS_TEMPLATE;
1426 }
1427
1428 void ASTDeclWriter::VisitClassTemplateSpecializationDecl(
1429                                            ClassTemplateSpecializationDecl *D) {
1430   RegisterTemplateSpecialization(D->getSpecializedTemplate(), D);
1431
1432   VisitCXXRecordDecl(D);
1433
1434   llvm::PointerUnion<ClassTemplateDecl *,
1435                      ClassTemplatePartialSpecializationDecl *> InstFrom
1436     = D->getSpecializedTemplateOrPartial();
1437   if (Decl *InstFromD = InstFrom.dyn_cast<ClassTemplateDecl *>()) {
1438     Record.AddDeclRef(InstFromD);
1439   } else {
1440     Record.AddDeclRef(InstFrom.get<ClassTemplatePartialSpecializationDecl *>());
1441     Record.AddTemplateArgumentList(&D->getTemplateInstantiationArgs());
1442   }
1443
1444   Record.AddTemplateArgumentList(&D->getTemplateArgs());
1445   Record.AddSourceLocation(D->getPointOfInstantiation());
1446   Record.push_back(D->getSpecializationKind());
1447   Record.push_back(D->isCanonicalDecl());
1448
1449   if (D->isCanonicalDecl()) {
1450     // When reading, we'll add it to the folding set of the following template.
1451     Record.AddDeclRef(D->getSpecializedTemplate()->getCanonicalDecl());
1452   }
1453
1454   // Explicit info.
1455   Record.AddTypeSourceInfo(D->getTypeAsWritten());
1456   if (D->getTypeAsWritten()) {
1457     Record.AddSourceLocation(D->getExternLoc());
1458     Record.AddSourceLocation(D->getTemplateKeywordLoc());
1459   }
1460
1461   Code = serialization::DECL_CLASS_TEMPLATE_SPECIALIZATION;
1462 }
1463
1464 void ASTDeclWriter::VisitClassTemplatePartialSpecializationDecl(
1465                                     ClassTemplatePartialSpecializationDecl *D) {
1466   VisitClassTemplateSpecializationDecl(D);
1467
1468   Record.AddTemplateParameterList(D->getTemplateParameters());
1469   Record.AddASTTemplateArgumentListInfo(D->getTemplateArgsAsWritten());
1470
1471   // These are read/set from/to the first declaration.
1472   if (D->getPreviousDecl() == nullptr) {
1473     Record.AddDeclRef(D->getInstantiatedFromMember());
1474     Record.push_back(D->isMemberSpecialization());
1475   }
1476
1477   Code = serialization::DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION;
1478 }
1479
1480 void ASTDeclWriter::VisitVarTemplateDecl(VarTemplateDecl *D) {
1481   VisitRedeclarableTemplateDecl(D);
1482
1483   if (D->isFirstDecl())
1484     AddTemplateSpecializations(D);
1485   Code = serialization::DECL_VAR_TEMPLATE;
1486 }
1487
1488 void ASTDeclWriter::VisitVarTemplateSpecializationDecl(
1489     VarTemplateSpecializationDecl *D) {
1490   RegisterTemplateSpecialization(D->getSpecializedTemplate(), D);
1491
1492   VisitVarDecl(D);
1493
1494   llvm::PointerUnion<VarTemplateDecl *, VarTemplatePartialSpecializationDecl *>
1495   InstFrom = D->getSpecializedTemplateOrPartial();
1496   if (Decl *InstFromD = InstFrom.dyn_cast<VarTemplateDecl *>()) {
1497     Record.AddDeclRef(InstFromD);
1498   } else {
1499     Record.AddDeclRef(InstFrom.get<VarTemplatePartialSpecializationDecl *>());
1500     Record.AddTemplateArgumentList(&D->getTemplateInstantiationArgs());
1501   }
1502
1503   // Explicit info.
1504   Record.AddTypeSourceInfo(D->getTypeAsWritten());
1505   if (D->getTypeAsWritten()) {
1506     Record.AddSourceLocation(D->getExternLoc());
1507     Record.AddSourceLocation(D->getTemplateKeywordLoc());
1508   }
1509
1510   Record.AddTemplateArgumentList(&D->getTemplateArgs());
1511   Record.AddSourceLocation(D->getPointOfInstantiation());
1512   Record.push_back(D->getSpecializationKind());
1513   Record.push_back(D->IsCompleteDefinition);
1514   Record.push_back(D->isCanonicalDecl());
1515
1516   if (D->isCanonicalDecl()) {
1517     // When reading, we'll add it to the folding set of the following template.
1518     Record.AddDeclRef(D->getSpecializedTemplate()->getCanonicalDecl());
1519   }
1520
1521   Code = serialization::DECL_VAR_TEMPLATE_SPECIALIZATION;
1522 }
1523
1524 void ASTDeclWriter::VisitVarTemplatePartialSpecializationDecl(
1525     VarTemplatePartialSpecializationDecl *D) {
1526   VisitVarTemplateSpecializationDecl(D);
1527
1528   Record.AddTemplateParameterList(D->getTemplateParameters());
1529   Record.AddASTTemplateArgumentListInfo(D->getTemplateArgsAsWritten());
1530
1531   // These are read/set from/to the first declaration.
1532   if (D->getPreviousDecl() == nullptr) {
1533     Record.AddDeclRef(D->getInstantiatedFromMember());
1534     Record.push_back(D->isMemberSpecialization());
1535   }
1536
1537   Code = serialization::DECL_VAR_TEMPLATE_PARTIAL_SPECIALIZATION;
1538 }
1539
1540 void ASTDeclWriter::VisitClassScopeFunctionSpecializationDecl(
1541                                     ClassScopeFunctionSpecializationDecl *D) {
1542   VisitDecl(D);
1543   Record.AddDeclRef(D->getSpecialization());
1544   Code = serialization::DECL_CLASS_SCOPE_FUNCTION_SPECIALIZATION;
1545 }
1546
1547
1548 void ASTDeclWriter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1549   VisitRedeclarableTemplateDecl(D);
1550
1551   if (D->isFirstDecl())
1552     AddTemplateSpecializations(D);
1553   Code = serialization::DECL_FUNCTION_TEMPLATE;
1554 }
1555
1556 void ASTDeclWriter::VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D) {
1557   VisitTypeDecl(D);
1558
1559   Record.push_back(D->wasDeclaredWithTypename());
1560
1561   bool OwnsDefaultArg = D->hasDefaultArgument() &&
1562                         !D->defaultArgumentWasInherited();
1563   Record.push_back(OwnsDefaultArg);
1564   if (OwnsDefaultArg)
1565     Record.AddTypeSourceInfo(D->getDefaultArgumentInfo());
1566
1567   Code = serialization::DECL_TEMPLATE_TYPE_PARM;
1568 }
1569
1570 void ASTDeclWriter::VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {
1571   // For an expanded parameter pack, record the number of expansion types here
1572   // so that it's easier for deserialization to allocate the right amount of
1573   // memory.
1574   if (D->isExpandedParameterPack())
1575     Record.push_back(D->getNumExpansionTypes());
1576
1577   VisitDeclaratorDecl(D);
1578   // TemplateParmPosition.
1579   Record.push_back(D->getDepth());
1580   Record.push_back(D->getPosition());
1581
1582   if (D->isExpandedParameterPack()) {
1583     for (unsigned I = 0, N = D->getNumExpansionTypes(); I != N; ++I) {
1584       Record.AddTypeRef(D->getExpansionType(I));
1585       Record.AddTypeSourceInfo(D->getExpansionTypeSourceInfo(I));
1586     }
1587
1588     Code = serialization::DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK;
1589   } else {
1590     // Rest of NonTypeTemplateParmDecl.
1591     Record.push_back(D->isParameterPack());
1592     bool OwnsDefaultArg = D->hasDefaultArgument() &&
1593                           !D->defaultArgumentWasInherited();
1594     Record.push_back(OwnsDefaultArg);
1595     if (OwnsDefaultArg)
1596       Record.AddStmt(D->getDefaultArgument());
1597     Code = serialization::DECL_NON_TYPE_TEMPLATE_PARM;
1598   }
1599 }
1600
1601 void ASTDeclWriter::VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D) {
1602   // For an expanded parameter pack, record the number of expansion types here
1603   // so that it's easier for deserialization to allocate the right amount of
1604   // memory.
1605   if (D->isExpandedParameterPack())
1606     Record.push_back(D->getNumExpansionTemplateParameters());
1607
1608   VisitTemplateDecl(D);
1609   // TemplateParmPosition.
1610   Record.push_back(D->getDepth());
1611   Record.push_back(D->getPosition());
1612
1613   if (D->isExpandedParameterPack()) {
1614     for (unsigned I = 0, N = D->getNumExpansionTemplateParameters();
1615          I != N; ++I)
1616       Record.AddTemplateParameterList(D->getExpansionTemplateParameters(I));
1617     Code = serialization::DECL_EXPANDED_TEMPLATE_TEMPLATE_PARM_PACK;
1618   } else {
1619     // Rest of TemplateTemplateParmDecl.
1620     Record.push_back(D->isParameterPack());
1621     bool OwnsDefaultArg = D->hasDefaultArgument() &&
1622                           !D->defaultArgumentWasInherited();
1623     Record.push_back(OwnsDefaultArg);
1624     if (OwnsDefaultArg)
1625       Record.AddTemplateArgumentLoc(D->getDefaultArgument());
1626     Code = serialization::DECL_TEMPLATE_TEMPLATE_PARM;
1627   }
1628 }
1629
1630 void ASTDeclWriter::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) {
1631   VisitRedeclarableTemplateDecl(D);
1632   Code = serialization::DECL_TYPE_ALIAS_TEMPLATE;
1633 }
1634
1635 void ASTDeclWriter::VisitStaticAssertDecl(StaticAssertDecl *D) {
1636   VisitDecl(D);
1637   Record.AddStmt(D->getAssertExpr());
1638   Record.push_back(D->isFailed());
1639   Record.AddStmt(D->getMessage());
1640   Record.AddSourceLocation(D->getRParenLoc());
1641   Code = serialization::DECL_STATIC_ASSERT;
1642 }
1643
1644 /// Emit the DeclContext part of a declaration context decl.
1645 void ASTDeclWriter::VisitDeclContext(DeclContext *DC) {
1646   Record.AddOffset(Writer.WriteDeclContextLexicalBlock(Context, DC));
1647   Record.AddOffset(Writer.WriteDeclContextVisibleBlock(Context, DC));
1648 }
1649
1650 const Decl *ASTWriter::getFirstLocalDecl(const Decl *D) {
1651   assert(IsLocalDecl(D) && "expected a local declaration");
1652
1653   const Decl *Canon = D->getCanonicalDecl();
1654   if (IsLocalDecl(Canon))
1655     return Canon;
1656
1657   const Decl *&CacheEntry = FirstLocalDeclCache[Canon];
1658   if (CacheEntry)
1659     return CacheEntry;
1660
1661   for (const Decl *Redecl = D; Redecl; Redecl = Redecl->getPreviousDecl())
1662     if (IsLocalDecl(Redecl))
1663       D = Redecl;
1664   return CacheEntry = D;
1665 }
1666
1667 template <typename T>
1668 void ASTDeclWriter::VisitRedeclarable(Redeclarable<T> *D) {
1669   T *First = D->getFirstDecl();
1670   T *MostRecent = First->getMostRecentDecl();
1671   T *DAsT = static_cast<T *>(D);
1672   if (MostRecent != First) {
1673     assert(isRedeclarableDeclKind(DAsT->getKind()) &&
1674            "Not considered redeclarable?");
1675
1676     Record.AddDeclRef(First);
1677
1678     // Write out a list of local redeclarations of this declaration if it's the
1679     // first local declaration in the chain.
1680     const Decl *FirstLocal = Writer.getFirstLocalDecl(DAsT);
1681     if (DAsT == FirstLocal) {
1682       // Emit a list of all imported first declarations so that we can be sure
1683       // that all redeclarations visible to this module are before D in the
1684       // redecl chain.
1685       unsigned I = Record.size();
1686       Record.push_back(0);
1687       if (Writer.Chain)
1688         AddFirstDeclFromEachModule(DAsT, /*IncludeLocal*/false);
1689       // This is the number of imported first declarations + 1.
1690       Record[I] = Record.size() - I;
1691
1692       // Collect the set of local redeclarations of this declaration, from
1693       // newest to oldest.
1694       ASTWriter::RecordData LocalRedecls;
1695       ASTRecordWriter LocalRedeclWriter(Record, LocalRedecls);
1696       for (const Decl *Prev = FirstLocal->getMostRecentDecl();
1697            Prev != FirstLocal; Prev = Prev->getPreviousDecl())
1698         if (!Prev->isFromASTFile())
1699           LocalRedeclWriter.AddDeclRef(Prev);
1700
1701       // If we have any redecls, write them now as a separate record preceding
1702       // the declaration itself.
1703       if (LocalRedecls.empty())
1704         Record.push_back(0);
1705       else
1706         Record.AddOffset(LocalRedeclWriter.Emit(LOCAL_REDECLARATIONS));
1707     } else {
1708       Record.push_back(0);
1709       Record.AddDeclRef(FirstLocal);
1710     }
1711
1712     // Make sure that we serialize both the previous and the most-recent
1713     // declarations, which (transitively) ensures that all declarations in the
1714     // chain get serialized.
1715     //
1716     // FIXME: This is not correct; when we reach an imported declaration we
1717     // won't emit its previous declaration.
1718     (void)Writer.GetDeclRef(D->getPreviousDecl());
1719     (void)Writer.GetDeclRef(MostRecent);
1720   } else {
1721     // We use the sentinel value 0 to indicate an only declaration.
1722     Record.push_back(0);
1723   }
1724 }
1725
1726 void ASTDeclWriter::VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D) {
1727   Record.push_back(D->varlist_size());
1728   VisitDecl(D);
1729   for (auto *I : D->varlists())
1730     Record.AddStmt(I);
1731   Code = serialization::DECL_OMP_THREADPRIVATE;
1732 }
1733
1734 void ASTDeclWriter::VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D) {
1735   VisitValueDecl(D);
1736   Record.AddSourceLocation(D->getLocStart());
1737   Record.AddStmt(D->getCombiner());
1738   Record.AddStmt(D->getInitializer());
1739   Record.push_back(D->getInitializerKind());
1740   Record.AddDeclRef(D->getPrevDeclInScope());
1741   Code = serialization::DECL_OMP_DECLARE_REDUCTION;
1742 }
1743
1744 void ASTDeclWriter::VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D) {
1745   VisitVarDecl(D);
1746   Code = serialization::DECL_OMP_CAPTUREDEXPR;
1747 }
1748
1749 //===----------------------------------------------------------------------===//
1750 // ASTWriter Implementation
1751 //===----------------------------------------------------------------------===//
1752
1753 void ASTWriter::WriteDeclAbbrevs() {
1754   using namespace llvm;
1755
1756   std::shared_ptr<BitCodeAbbrev> Abv;
1757
1758   // Abbreviation for DECL_FIELD
1759   Abv = std::make_shared<BitCodeAbbrev>();
1760   Abv->Add(BitCodeAbbrevOp(serialization::DECL_FIELD));
1761   // Decl
1762   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1763   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1764   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1765   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1766   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1767   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1768   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1769   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1770   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1771   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1772   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1773   // NamedDecl
1774   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1775   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1776   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1777   // ValueDecl
1778   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1779   // DeclaratorDecl
1780   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1781   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1782   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TSIType
1783   // FieldDecl
1784   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1785   Abv->Add(BitCodeAbbrevOp(0));                       // InitStyle
1786   // Type Source Info
1787   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1788   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1789   DeclFieldAbbrev = Stream.EmitAbbrev(std::move(Abv));
1790
1791   // Abbreviation for DECL_OBJC_IVAR
1792   Abv = std::make_shared<BitCodeAbbrev>();
1793   Abv->Add(BitCodeAbbrevOp(serialization::DECL_OBJC_IVAR));
1794   // Decl
1795   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1796   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1797   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1798   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1799   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1800   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1801   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1802   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1803   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1804   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1805   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1806   // NamedDecl
1807   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1808   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1809   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1810   // ValueDecl
1811   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1812   // DeclaratorDecl
1813   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1814   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1815   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TSIType
1816   // FieldDecl
1817   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1818   Abv->Add(BitCodeAbbrevOp(0));                       // InitStyle
1819   // ObjC Ivar
1820   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getAccessControl
1821   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getSynthesize
1822   // Type Source Info
1823   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1824   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1825   DeclObjCIvarAbbrev = Stream.EmitAbbrev(std::move(Abv));
1826
1827   // Abbreviation for DECL_ENUM
1828   Abv = std::make_shared<BitCodeAbbrev>();
1829   Abv->Add(BitCodeAbbrevOp(serialization::DECL_ENUM));
1830   // Redeclarable
1831   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1832   // Decl
1833   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1834   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1835   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1836   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1837   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1838   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1839   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1840   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1841   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1842   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1843   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1844   // NamedDecl
1845   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1846   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1847   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1848   // TypeDecl
1849   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1850   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1851   // TagDecl
1852   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1853   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1854   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1855   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1856   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1857   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsCompleteDefinitionRequired
1858   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1859   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1860   Abv->Add(BitCodeAbbrevOp(0));                         // ExtInfoKind
1861   // EnumDecl
1862   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // AddTypeRef
1863   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IntegerType
1864   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getPromotionType
1865   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumPositiveBits
1866   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumNegativeBits
1867   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScoped
1868   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScopedUsingClassTag
1869   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isFixed
1870   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));// ODRHash
1871   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // InstantiatedMembEnum
1872   // DC
1873   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1874   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1875   DeclEnumAbbrev = Stream.EmitAbbrev(std::move(Abv));
1876
1877   // Abbreviation for DECL_RECORD
1878   Abv = std::make_shared<BitCodeAbbrev>();
1879   Abv->Add(BitCodeAbbrevOp(serialization::DECL_RECORD));
1880   // Redeclarable
1881   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1882   // Decl
1883   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1884   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1885   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1886   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1887   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1888   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1889   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1890   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1891   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1892   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1893   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1894   // NamedDecl
1895   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1896   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1897   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1898   // TypeDecl
1899   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1900   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1901   // TagDecl
1902   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1903   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1904   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1905   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1906   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1907   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsCompleteDefinitionRequired
1908   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1909   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1910   Abv->Add(BitCodeAbbrevOp(0));                         // ExtInfoKind
1911   // RecordDecl
1912   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // FlexibleArrayMember
1913   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // AnonymousStructUnion
1914   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasObjectMember
1915   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasVolatileMember
1916
1917   // isNonTrivialToPrimitiveDefaultInitialize
1918   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
1919   // isNonTrivialToPrimitiveCopy
1920   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
1921   // isNonTrivialToPrimitiveDestroy
1922   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
1923   // isParamDestroyedInCallee
1924   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
1925   // getArgPassingRestrictions
1926   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));
1927
1928   // DC
1929   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1930   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1931   DeclRecordAbbrev = Stream.EmitAbbrev(std::move(Abv));
1932
1933   // Abbreviation for DECL_PARM_VAR
1934   Abv = std::make_shared<BitCodeAbbrev>();
1935   Abv->Add(BitCodeAbbrevOp(serialization::DECL_PARM_VAR));
1936   // Redeclarable
1937   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1938   // Decl
1939   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1940   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1941   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1942   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1943   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1944   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1945   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1946   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1947   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1948   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1949   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1950   // NamedDecl
1951   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1952   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1953   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1954   // ValueDecl
1955   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1956   // DeclaratorDecl
1957   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1958   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1959   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TSIType
1960   // VarDecl
1961   Abv->Add(BitCodeAbbrevOp(0));                       // SClass
1962   Abv->Add(BitCodeAbbrevOp(0));                       // TSCSpec
1963   Abv->Add(BitCodeAbbrevOp(0));                       // InitStyle
1964   Abv->Add(BitCodeAbbrevOp(0));                       // Linkage
1965   Abv->Add(BitCodeAbbrevOp(0));                       // HasInit
1966   Abv->Add(BitCodeAbbrevOp(0));                   // HasMemberSpecializationInfo
1967   // ParmVarDecl
1968   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsObjCMethodParameter
1969   Abv->Add(BitCodeAbbrevOp(0));                       // ScopeDepth
1970   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ScopeIndex
1971   Abv->Add(BitCodeAbbrevOp(0));                       // ObjCDeclQualifier
1972   Abv->Add(BitCodeAbbrevOp(0));                       // KNRPromoted
1973   Abv->Add(BitCodeAbbrevOp(0));                       // HasInheritedDefaultArg
1974   Abv->Add(BitCodeAbbrevOp(0));                   // HasUninstantiatedDefaultArg
1975   // Type Source Info
1976   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1977   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1978   DeclParmVarAbbrev = Stream.EmitAbbrev(std::move(Abv));
1979
1980   // Abbreviation for DECL_TYPEDEF
1981   Abv = std::make_shared<BitCodeAbbrev>();
1982   Abv->Add(BitCodeAbbrevOp(serialization::DECL_TYPEDEF));
1983   // Redeclarable
1984   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1985   // Decl
1986   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1987   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1988   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1989   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1990   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1991   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isUsed
1992   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isReferenced
1993   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1994   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // C++ AccessSpecifier
1995   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1996   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1997   // NamedDecl
1998   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1999   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
2000   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
2001   // TypeDecl
2002   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
2003   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
2004   // TypedefDecl
2005   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2006   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
2007   DeclTypedefAbbrev = Stream.EmitAbbrev(std::move(Abv));
2008
2009   // Abbreviation for DECL_VAR
2010   Abv = std::make_shared<BitCodeAbbrev>();
2011   Abv->Add(BitCodeAbbrevOp(serialization::DECL_VAR));
2012   // Redeclarable
2013   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
2014   // Decl
2015   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
2016   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
2017   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
2018   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
2019   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
2020   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
2021   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
2022   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
2023   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
2024   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
2025   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
2026   // NamedDecl
2027   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
2028   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
2029   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
2030   // ValueDecl
2031   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2032   // DeclaratorDecl
2033   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
2034   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
2035   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TSIType
2036   // VarDecl
2037   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // SClass
2038   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // TSCSpec
2039   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // InitStyle
2040   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsThisDeclarationADemotedDefinition
2041   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isExceptionVariable
2042   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isNRVOVariable
2043   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCXXForRangeDecl
2044   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isObjCForDecl
2045   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isARCPseudoStrong
2046   Abv->Add(BitCodeAbbrevOp(0));                         // isInline
2047   Abv->Add(BitCodeAbbrevOp(0));                         // isInlineSpecified
2048   Abv->Add(BitCodeAbbrevOp(0));                         // isConstexpr
2049   Abv->Add(BitCodeAbbrevOp(0));                         // isInitCapture
2050   Abv->Add(BitCodeAbbrevOp(0));                         // isPrevDeclInSameScope
2051   Abv->Add(BitCodeAbbrevOp(0));                         // ImplicitParamKind
2052   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Linkage
2053   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // IsInitICE (local)
2054   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // VarKind (local enum)
2055   // Type Source Info
2056   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2057   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
2058   DeclVarAbbrev = Stream.EmitAbbrev(std::move(Abv));
2059
2060   // Abbreviation for DECL_CXX_METHOD
2061   Abv = std::make_shared<BitCodeAbbrev>();
2062   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CXX_METHOD));
2063   // RedeclarableDecl
2064   Abv->Add(BitCodeAbbrevOp(0));                         // CanonicalDecl
2065   // Decl
2066   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // DeclContext
2067   Abv->Add(BitCodeAbbrevOp(0));                         // LexicalDeclContext
2068   Abv->Add(BitCodeAbbrevOp(0));                         // Invalid
2069   Abv->Add(BitCodeAbbrevOp(0));                         // HasAttrs
2070   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Implicit
2071   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Used
2072   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Referenced
2073   Abv->Add(BitCodeAbbrevOp(0));                         // InObjCContainer
2074   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // Access
2075   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ModulePrivate
2076   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SubmoduleID
2077   // NamedDecl
2078   Abv->Add(BitCodeAbbrevOp(DeclarationName::Identifier)); // NameKind
2079   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // Identifier
2080   Abv->Add(BitCodeAbbrevOp(0));                         // AnonDeclNumber
2081   // ValueDecl
2082   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // Type
2083   // DeclaratorDecl
2084   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // InnerLocStart
2085   Abv->Add(BitCodeAbbrevOp(0));                         // HasExtInfo
2086   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // TSIType
2087   // FunctionDecl
2088   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 11)); // IDNS
2089   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // StorageClass
2090   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Inline
2091   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InlineSpecified
2092   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ExplicitSpecified
2093   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // VirtualAsWritten
2094   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Pure
2095   Abv->Add(BitCodeAbbrevOp(0));                         // HasInheritedProto
2096   Abv->Add(BitCodeAbbrevOp(1));                         // HasWrittenProto
2097   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Deleted
2098   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Trivial
2099   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // TrivialForCall
2100   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Defaulted
2101   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ExplicitlyDefaulted
2102   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ImplicitReturnZero
2103   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constexpr
2104   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // UsesSEHTry
2105   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // SkippedBody
2106   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // MultiVersion
2107   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // LateParsed
2108   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Linkage
2109   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LocEnd
2110   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // ODRHash
2111   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // TemplateKind
2112   // This Array slurps the rest of the record. Fortunately we want to encode
2113   // (nearly) all the remaining (variable number of) fields in the same way.
2114   //
2115   // This is the function template information if any, then
2116   //         NumParams and Params[] from FunctionDecl, and
2117   //         NumOverriddenMethods, OverriddenMethods[] from CXXMethodDecl.
2118   //
2119   //  Add an AbbrevOp for 'size then elements' and use it here.
2120   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2121   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
2122   DeclCXXMethodAbbrev = Stream.EmitAbbrev(std::move(Abv));
2123
2124   // Abbreviation for EXPR_DECL_REF
2125   Abv = std::make_shared<BitCodeAbbrev>();
2126   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_DECL_REF));
2127   //Stmt
2128   //Expr
2129   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2130   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2131   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2132   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2133   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2134   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2135   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2136   //DeclRefExpr
2137   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HasQualifier
2138   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //GetDeclFound
2139   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ExplicitTemplateArgs
2140   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HadMultipleCandidates
2141   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
2142                            1)); // RefersToEnclosingVariableOrCapture
2143   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclRef
2144   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
2145   DeclRefExprAbbrev = Stream.EmitAbbrev(std::move(Abv));
2146
2147   // Abbreviation for EXPR_INTEGER_LITERAL
2148   Abv = std::make_shared<BitCodeAbbrev>();
2149   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_INTEGER_LITERAL));
2150   //Stmt
2151   //Expr
2152   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2153   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2154   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2155   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2156   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2157   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2158   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2159   //Integer Literal
2160   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
2161   Abv->Add(BitCodeAbbrevOp(32));                      // Bit Width
2162   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Value
2163   IntegerLiteralAbbrev = Stream.EmitAbbrev(std::move(Abv));
2164
2165   // Abbreviation for EXPR_CHARACTER_LITERAL
2166   Abv = std::make_shared<BitCodeAbbrev>();
2167   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_CHARACTER_LITERAL));
2168   //Stmt
2169   //Expr
2170   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2171   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2172   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2173   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2174   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2175   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2176   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2177   //Character Literal
2178   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getValue
2179   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
2180   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // getKind
2181   CharacterLiteralAbbrev = Stream.EmitAbbrev(std::move(Abv));
2182
2183   // Abbreviation for EXPR_IMPLICIT_CAST
2184   Abv = std::make_shared<BitCodeAbbrev>();
2185   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_IMPLICIT_CAST));
2186   // Stmt
2187   // Expr
2188   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2189   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2190   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2191   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2192   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2193   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2194   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2195   // CastExpr
2196   Abv->Add(BitCodeAbbrevOp(0)); // PathSize
2197   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 6)); // CastKind
2198   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // PartOfExplicitCast
2199   // ImplicitCastExpr
2200   ExprImplicitCastAbbrev = Stream.EmitAbbrev(std::move(Abv));
2201
2202   Abv = std::make_shared<BitCodeAbbrev>();
2203   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_LEXICAL));
2204   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2205   DeclContextLexicalAbbrev = Stream.EmitAbbrev(std::move(Abv));
2206
2207   Abv = std::make_shared<BitCodeAbbrev>();
2208   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_VISIBLE));
2209   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2210   DeclContextVisibleLookupAbbrev = Stream.EmitAbbrev(std::move(Abv));
2211 }
2212
2213 /// isRequiredDecl - Check if this is a "required" Decl, which must be seen by
2214 /// consumers of the AST.
2215 ///
2216 /// Such decls will always be deserialized from the AST file, so we would like
2217 /// this to be as restrictive as possible. Currently the predicate is driven by
2218 /// code generation requirements, if other clients have a different notion of
2219 /// what is "required" then we may have to consider an alternate scheme where
2220 /// clients can iterate over the top-level decls and get information on them,
2221 /// without necessary deserializing them. We could explicitly require such
2222 /// clients to use a separate API call to "realize" the decl. This should be
2223 /// relatively painless since they would presumably only do it for top-level
2224 /// decls.
2225 static bool isRequiredDecl(const Decl *D, ASTContext &Context,
2226                            bool WritingModule) {
2227   // An ObjCMethodDecl is never considered as "required" because its
2228   // implementation container always is.
2229
2230   // File scoped assembly or obj-c or OMP declare target implementation must be
2231   // seen.
2232   if (isa<FileScopeAsmDecl>(D) || isa<ObjCImplDecl>(D) ||
2233       D->hasAttr<OMPDeclareTargetDeclAttr>())
2234     return true;
2235
2236   if (WritingModule && (isa<VarDecl>(D) || isa<ImportDecl>(D))) {
2237     // These declarations are part of the module initializer, and are emitted
2238     // if and when the module is imported, rather than being emitted eagerly.
2239     return false;
2240   }
2241
2242   return Context.DeclMustBeEmitted(D);
2243 }
2244
2245 void ASTWriter::WriteDecl(ASTContext &Context, Decl *D) {
2246   PrettyDeclStackTraceEntry CrashInfo(Context, D, SourceLocation(),
2247                                       "serializing");
2248
2249   // Determine the ID for this declaration.
2250   serialization::DeclID ID;
2251   assert(!D->isFromASTFile() && "should not be emitting imported decl");
2252   serialization::DeclID &IDR = DeclIDs[D];
2253   if (IDR == 0)
2254     IDR = NextDeclID++;
2255
2256   ID = IDR;
2257
2258   assert(ID >= FirstDeclID && "invalid decl ID");
2259
2260   RecordData Record;
2261   ASTDeclWriter W(*this, Context, Record);
2262
2263   // Build a record for this declaration
2264   W.Visit(D);
2265
2266   // Emit this declaration to the bitstream.
2267   uint64_t Offset = W.Emit(D);
2268
2269   // Record the offset for this declaration
2270   SourceLocation Loc = D->getLocation();
2271   unsigned Index = ID - FirstDeclID;
2272   if (DeclOffsets.size() == Index)
2273     DeclOffsets.push_back(DeclOffset(Loc, Offset));
2274   else if (DeclOffsets.size() < Index) {
2275     // FIXME: Can/should this happen?
2276     DeclOffsets.resize(Index+1);
2277     DeclOffsets[Index].setLocation(Loc);
2278     DeclOffsets[Index].BitOffset = Offset;
2279   } else {
2280     llvm_unreachable("declarations should be emitted in ID order");
2281   }
2282
2283   SourceManager &SM = Context.getSourceManager();
2284   if (Loc.isValid() && SM.isLocalSourceLocation(Loc))
2285     associateDeclWithFile(D, ID);
2286
2287   // Note declarations that should be deserialized eagerly so that we can add
2288   // them to a record in the AST file later.
2289   if (isRequiredDecl(D, Context, WritingModule))
2290     EagerlyDeserializedDecls.push_back(ID);
2291 }
2292
2293 void ASTRecordWriter::AddFunctionDefinition(const FunctionDecl *FD) {
2294   // Switch case IDs are per function body.
2295   Writer->ClearSwitchCaseIDs();
2296
2297   assert(FD->doesThisDeclarationHaveABody());
2298   bool ModulesCodegen = false;
2299   if (Writer->WritingModule && !FD->isDependentContext()) {
2300     Optional<GVALinkage> Linkage;
2301     if (Writer->WritingModule->Kind == Module::ModuleInterfaceUnit) {
2302       // When building a C++ Modules TS module interface unit, a strong
2303       // definition in the module interface is provided by the compilation of
2304       // that module interface unit, not by its users. (Inline functions are
2305       // still emitted in module users.)
2306       Linkage = Writer->Context->GetGVALinkageForFunction(FD);
2307       ModulesCodegen = *Linkage == GVA_StrongExternal;
2308     }
2309     if (Writer->Context->getLangOpts().ModulesCodegen) {
2310       // Under -fmodules-codegen, codegen is performed for all non-internal,
2311       // non-always_inline functions.
2312       if (!FD->hasAttr<AlwaysInlineAttr>()) {
2313         if (!Linkage)
2314           Linkage = Writer->Context->GetGVALinkageForFunction(FD);
2315         ModulesCodegen = *Linkage != GVA_Internal;
2316       }
2317     }
2318   }
2319   Record->push_back(ModulesCodegen);
2320   if (ModulesCodegen)
2321     Writer->ModularCodegenDecls.push_back(Writer->GetDeclRef(FD));
2322   if (auto *CD = dyn_cast<CXXConstructorDecl>(FD)) {
2323     Record->push_back(CD->getNumCtorInitializers());
2324     if (CD->getNumCtorInitializers())
2325       AddCXXCtorInitializers(
2326           llvm::makeArrayRef(CD->init_begin(), CD->init_end()));
2327   }
2328   AddStmt(FD->getBody());
2329 }