contrib/llvm-project/clang/lib/Serialization/ASTWriterDecl.cpp

   1 //===--- ASTWriterDecl.cpp - Declaration Serialization --------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 //  This file implements serialization for Declarations.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "ASTCommon.h"
  14 #include "clang/AST/DeclCXX.h"
  15 #include "clang/AST/DeclContextInternals.h"
  16 #include "clang/AST/DeclTemplate.h"
  17 #include "clang/AST/DeclVisitor.h"
  18 #include "clang/AST/Expr.h"
  19 #include "clang/AST/OpenMPClause.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/Bitstream/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 VisitConceptDecl(ConceptDecl *D);
 106     void VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D);
 107     void VisitClassTemplateDecl(ClassTemplateDecl *D);
 108     void VisitVarTemplateDecl(VarTemplateDecl *D);
 109     void VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
 110     void VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D);
 111     void VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D);
 112     void VisitUsingDecl(UsingDecl *D);
 113     void VisitUsingPackDecl(UsingPackDecl *D);
 114     void VisitUsingShadowDecl(UsingShadowDecl *D);
 115     void VisitConstructorUsingShadowDecl(ConstructorUsingShadowDecl *D);
 116     void VisitLinkageSpecDecl(LinkageSpecDecl *D);
 117     void VisitExportDecl(ExportDecl *D);
 118     void VisitFileScopeAsmDecl(FileScopeAsmDecl *D);
 119     void VisitImportDecl(ImportDecl *D);
 120     void VisitAccessSpecDecl(AccessSpecDecl *D);
 121     void VisitFriendDecl(FriendDecl *D);
 122     void VisitFriendTemplateDecl(FriendTemplateDecl *D);
 123     void VisitStaticAssertDecl(StaticAssertDecl *D);
 124     void VisitBlockDecl(BlockDecl *D);
 125     void VisitCapturedDecl(CapturedDecl *D);
 126     void VisitEmptyDecl(EmptyDecl *D);
 127
 128     void VisitDeclContext(DeclContext *DC);
 129     template <typename T> void VisitRedeclarable(Redeclarable<T> *D);
 130
 131
 132     // FIXME: Put in the same order is DeclNodes.td?
 133     void VisitObjCMethodDecl(ObjCMethodDecl *D);
 134     void VisitObjCTypeParamDecl(ObjCTypeParamDecl *D);
 135     void VisitObjCContainerDecl(ObjCContainerDecl *D);
 136     void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
 137     void VisitObjCIvarDecl(ObjCIvarDecl *D);
 138     void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
 139     void VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D);
 140     void VisitObjCCategoryDecl(ObjCCategoryDecl *D);
 141     void VisitObjCImplDecl(ObjCImplDecl *D);
 142     void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
 143     void VisitObjCImplementationDecl(ObjCImplementationDecl *D);
 144     void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D);
 145     void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
 146     void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
 147     void VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D);
 148     void VisitOMPAllocateDecl(OMPAllocateDecl *D);
 149     void VisitOMPRequiresDecl(OMPRequiresDecl *D);
 150     void VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D);
 151     void VisitOMPDeclareMapperDecl(OMPDeclareMapperDecl *D);
 152     void VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D);
 153
 154     /// Add an Objective-C type parameter list to the given record.
 155     void AddObjCTypeParamList(ObjCTypeParamList *typeParams) {
 156       // Empty type parameter list.
 157       if (!typeParams) {
 158         Record.push_back(0);
 159         return;
 160       }
 161
 162       Record.push_back(typeParams->size());
 163       for (auto typeParam : *typeParams) {
 164         Record.AddDeclRef(typeParam);
 165       }
 166       Record.AddSourceLocation(typeParams->getLAngleLoc());
 167       Record.AddSourceLocation(typeParams->getRAngleLoc());
 168     }
 169
 170     /// Add to the record the first declaration from each module file that
 171     /// provides a declaration of D. The intent is to provide a sufficient
 172     /// set such that reloading this set will load all current redeclarations.
 173     void AddFirstDeclFromEachModule(const Decl *D, bool IncludeLocal) {
 174       llvm::MapVector<ModuleFile*, const Decl*> Firsts;
 175       // FIXME: We can skip entries that we know are implied by others.
 176       for (const Decl *R = D->getMostRecentDecl(); R; R = R->getPreviousDecl()) {
 177         if (R->isFromASTFile())
 178           Firsts[Writer.Chain->getOwningModuleFile(R)] = R;
 179         else if (IncludeLocal)
 180           Firsts[nullptr] = R;
 181       }
 182       for (const auto &F : Firsts)
 183         Record.AddDeclRef(F.second);
 184     }
 185
 186     /// Get the specialization decl from an entry in the specialization list.
 187     template <typename EntryType>
 188     typename RedeclarableTemplateDecl::SpecEntryTraits<EntryType>::DeclType *
 189     getSpecializationDecl(EntryType &T) {
 190       return RedeclarableTemplateDecl::SpecEntryTraits<EntryType>::getDecl(&T);
 191     }
 192
 193     /// Get the list of partial specializations from a template's common ptr.
 194     template<typename T>
 195     decltype(T::PartialSpecializations) &getPartialSpecializations(T *Common) {
 196       return Common->PartialSpecializations;
 197     }
 198     ArrayRef<Decl> getPartialSpecializations(FunctionTemplateDecl::Common *) {
 199       return None;
 200     }
 201
 202     template<typename DeclTy>
 203     void AddTemplateSpecializations(DeclTy *D) {
 204       auto *Common = D->getCommonPtr();
 205
 206       // If we have any lazy specializations, and the external AST source is
 207       // our chained AST reader, we can just write out the DeclIDs. Otherwise,
 208       // we need to resolve them to actual declarations.
 209       if (Writer.Chain != Writer.Context->getExternalSource() &&
 210           Common->LazySpecializations) {
 211         D->LoadLazySpecializations();
 212         assert(!Common->LazySpecializations);
 213       }
 214
 215       ArrayRef<DeclID> LazySpecializations;
 216       if (auto *LS = Common->LazySpecializations)
 217         LazySpecializations = llvm::makeArrayRef(LS + 1, LS[0]);
 218
 219       // Add a slot to the record for the number of specializations.
 220       unsigned I = Record.size();
 221       Record.push_back(0);
 222
 223       // AddFirstDeclFromEachModule might trigger deserialization, invalidating
 224       // *Specializations iterators.
 225       llvm::SmallVector<const Decl*, 16> Specs;
 226       for (auto &Entry : Common->Specializations)
 227         Specs.push_back(getSpecializationDecl(Entry));
 228       for (auto &Entry : getPartialSpecializations(Common))
 229         Specs.push_back(getSpecializationDecl(Entry));
 230
 231       for (auto *D : Specs) {
 232         assert(D->isCanonicalDecl() && "non-canonical decl in set");
 233         AddFirstDeclFromEachModule(D, /*IncludeLocal*/true);
 234       }
 235       Record.append(LazySpecializations.begin(), LazySpecializations.end());
 236
 237       // Update the size entry we added earlier.
 238       Record[I] = Record.size() - I - 1;
 239     }
 240
 241     /// Ensure that this template specialization is associated with the specified
 242     /// template on reload.
 243     void RegisterTemplateSpecialization(const Decl *Template,
 244                                         const Decl *Specialization) {
 245       Template = Template->getCanonicalDecl();
 246
 247       // If the canonical template is local, we'll write out this specialization
 248       // when we emit it.
 249       // FIXME: We can do the same thing if there is any local declaration of
 250       // the template, to avoid emitting an update record.
 251       if (!Template->isFromASTFile())
 252         return;
 253
 254       // We only need to associate the first local declaration of the
 255       // specialization. The other declarations will get pulled in by it.
 256       if (Writer.getFirstLocalDecl(Specialization) != Specialization)
 257         return;
 258
 259       Writer.DeclUpdates[Template].push_back(ASTWriter::DeclUpdate(
 260           UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION, Specialization));
 261     }
 262   };
 263 }
 264
 265 void ASTDeclWriter::Visit(Decl *D) {
 266   DeclVisitor<ASTDeclWriter>::Visit(D);
 267
 268   // Source locations require array (variable-length) abbreviations.  The
 269   // abbreviation infrastructure requires that arrays are encoded last, so
 270   // we handle it here in the case of those classes derived from DeclaratorDecl
 271   if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)) {
 272     if (auto *TInfo = DD->getTypeSourceInfo())
 273       Record.AddTypeLoc(TInfo->getTypeLoc());
 274   }
 275
 276   // Handle FunctionDecl's body here and write it after all other Stmts/Exprs
 277   // have been written. We want it last because we will not read it back when
 278   // retrieving it from the AST, we'll just lazily set the offset.
 279   if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
 280     Record.push_back(FD->doesThisDeclarationHaveABody());
 281     if (FD->doesThisDeclarationHaveABody())
 282       Record.AddFunctionDefinition(FD);
 283   }
 284
 285   // If this declaration is also a DeclContext, write blocks for the
 286   // declarations that lexically stored inside its context and those
 287   // declarations that are visible from its context.
 288   if (DeclContext *DC = dyn_cast<DeclContext>(D))
 289     VisitDeclContext(DC);
 290 }
 291
 292 void ASTDeclWriter::VisitDecl(Decl *D) {
 293   Record.AddDeclRef(cast_or_null<Decl>(D->getDeclContext()));
 294   if (D->getDeclContext() != D->getLexicalDeclContext())
 295     Record.AddDeclRef(cast_or_null<Decl>(D->getLexicalDeclContext()));
 296   else
 297     Record.push_back(0);
 298   Record.push_back(D->isInvalidDecl());
 299   Record.push_back(D->hasAttrs());
 300   if (D->hasAttrs())
 301     Record.AddAttributes(D->getAttrs());
 302   Record.push_back(D->isImplicit());
 303   Record.push_back(D->isUsed(false));
 304   Record.push_back(D->isReferenced());
 305   Record.push_back(D->isTopLevelDeclInObjCContainer());
 306   Record.push_back(D->getAccess());
 307   Record.push_back(D->isModulePrivate());
 308   Record.push_back(Writer.getSubmoduleID(D->getOwningModule()));
 309
 310   // If this declaration injected a name into a context different from its
 311   // lexical context, and that context is an imported namespace, we need to
 312   // update its visible declarations to include this name.
 313   //
 314   // This happens when we instantiate a class with a friend declaration or a
 315   // function with a local extern declaration, for instance.
 316   //
 317   // FIXME: Can we handle this in AddedVisibleDecl instead?
 318   if (D->isOutOfLine()) {
 319     auto *DC = D->getDeclContext();
 320     while (auto *NS = dyn_cast<NamespaceDecl>(DC->getRedeclContext())) {
 321       if (!NS->isFromASTFile())
 322         break;
 323       Writer.UpdatedDeclContexts.insert(NS->getPrimaryContext());
 324       if (!NS->isInlineNamespace())
 325         break;
 326       DC = NS->getParent();
 327     }
 328   }
 329 }
 330
 331 void ASTDeclWriter::VisitPragmaCommentDecl(PragmaCommentDecl *D) {
 332   StringRef Arg = D->getArg();
 333   Record.push_back(Arg.size());
 334   VisitDecl(D);
 335   Record.AddSourceLocation(D->getBeginLoc());
 336   Record.push_back(D->getCommentKind());
 337   Record.AddString(Arg);
 338   Code = serialization::DECL_PRAGMA_COMMENT;
 339 }
 340
 341 void ASTDeclWriter::VisitPragmaDetectMismatchDecl(
 342     PragmaDetectMismatchDecl *D) {
 343   StringRef Name = D->getName();
 344   StringRef Value = D->getValue();
 345   Record.push_back(Name.size() + 1 + Value.size());
 346   VisitDecl(D);
 347   Record.AddSourceLocation(D->getBeginLoc());
 348   Record.AddString(Name);
 349   Record.AddString(Value);
 350   Code = serialization::DECL_PRAGMA_DETECT_MISMATCH;
 351 }
 352
 353 void ASTDeclWriter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
 354   llvm_unreachable("Translation units aren't directly serialized");
 355 }
 356
 357 void ASTDeclWriter::VisitNamedDecl(NamedDecl *D) {
 358   VisitDecl(D);
 359   Record.AddDeclarationName(D->getDeclName());
 360   Record.push_back(needsAnonymousDeclarationNumber(D)
 361                        ? Writer.getAnonymousDeclarationNumber(D)
 362                        : 0);
 363 }
 364
 365 void ASTDeclWriter::VisitTypeDecl(TypeDecl *D) {
 366   VisitNamedDecl(D);
 367   Record.AddSourceLocation(D->getBeginLoc());
 368   Record.AddTypeRef(QualType(D->getTypeForDecl(), 0));
 369 }
 370
 371 void ASTDeclWriter::VisitTypedefNameDecl(TypedefNameDecl *D) {
 372   VisitRedeclarable(D);
 373   VisitTypeDecl(D);
 374   Record.AddTypeSourceInfo(D->getTypeSourceInfo());
 375   Record.push_back(D->isModed());
 376   if (D->isModed())
 377     Record.AddTypeRef(D->getUnderlyingType());
 378   Record.AddDeclRef(D->getAnonDeclWithTypedefName(false));
 379 }
 380
 381 void ASTDeclWriter::VisitTypedefDecl(TypedefDecl *D) {
 382   VisitTypedefNameDecl(D);
 383   if (D->getDeclContext() == D->getLexicalDeclContext() &&
 384       !D->hasAttrs() &&
 385       !D->isImplicit() &&
 386       D->getFirstDecl() == D->getMostRecentDecl() &&
 387       !D->isInvalidDecl() &&
 388       !D->isTopLevelDeclInObjCContainer() &&
 389       !D->isModulePrivate() &&
 390       !needsAnonymousDeclarationNumber(D) &&
 391       D->getDeclName().getNameKind() == DeclarationName::Identifier)
 392     AbbrevToUse = Writer.getDeclTypedefAbbrev();
 393
 394   Code = serialization::DECL_TYPEDEF;
 395 }
 396
 397 void ASTDeclWriter::VisitTypeAliasDecl(TypeAliasDecl *D) {
 398   VisitTypedefNameDecl(D);
 399   Record.AddDeclRef(D->getDescribedAliasTemplate());
 400   Code = serialization::DECL_TYPEALIAS;
 401 }
 402
 403 void ASTDeclWriter::VisitTagDecl(TagDecl *D) {
 404   VisitRedeclarable(D);
 405   VisitTypeDecl(D);
 406   Record.push_back(D->getIdentifierNamespace());
 407   Record.push_back((unsigned)D->getTagKind()); // FIXME: stable encoding
 408   if (!isa<CXXRecordDecl>(D))
 409     Record.push_back(D->isCompleteDefinition());
 410   Record.push_back(D->isEmbeddedInDeclarator());
 411   Record.push_back(D->isFreeStanding());
 412   Record.push_back(D->isCompleteDefinitionRequired());
 413   Record.AddSourceRange(D->getBraceRange());
 414
 415   if (D->hasExtInfo()) {
 416     Record.push_back(1);
 417     Record.AddQualifierInfo(*D->getExtInfo());
 418   } else if (auto *TD = D->getTypedefNameForAnonDecl()) {
 419     Record.push_back(2);
 420     Record.AddDeclRef(TD);
 421     Record.AddIdentifierRef(TD->getDeclName().getAsIdentifierInfo());
 422   } else {
 423     Record.push_back(0);
 424   }
 425 }
 426
 427 void ASTDeclWriter::VisitEnumDecl(EnumDecl *D) {
 428   VisitTagDecl(D);
 429   Record.AddTypeSourceInfo(D->getIntegerTypeSourceInfo());
 430   if (!D->getIntegerTypeSourceInfo())
 431     Record.AddTypeRef(D->getIntegerType());
 432   Record.AddTypeRef(D->getPromotionType());
 433   Record.push_back(D->getNumPositiveBits());
 434   Record.push_back(D->getNumNegativeBits());
 435   Record.push_back(D->isScoped());
 436   Record.push_back(D->isScopedUsingClassTag());
 437   Record.push_back(D->isFixed());
 438   Record.push_back(D->getODRHash());
 439
 440   if (MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo()) {
 441     Record.AddDeclRef(MemberInfo->getInstantiatedFrom());
 442     Record.push_back(MemberInfo->getTemplateSpecializationKind());
 443     Record.AddSourceLocation(MemberInfo->getPointOfInstantiation());
 444   } else {
 445     Record.AddDeclRef(nullptr);
 446   }
 447
 448   if (D->getDeclContext() == D->getLexicalDeclContext() &&
 449       !D->hasAttrs() &&
 450       !D->isImplicit() &&
 451       !D->isUsed(false) &&
 452       !D->hasExtInfo() &&
 453       !D->getTypedefNameForAnonDecl() &&
 454       D->getFirstDecl() == D->getMostRecentDecl() &&
 455       !D->isInvalidDecl() &&
 456       !D->isReferenced() &&
 457       !D->isTopLevelDeclInObjCContainer() &&
 458       D->getAccess() == AS_none &&
 459       !D->isModulePrivate() &&
 460       !CXXRecordDecl::classofKind(D->getKind()) &&
 461       !D->getIntegerTypeSourceInfo() &&
 462       !D->getMemberSpecializationInfo() &&
 463       !needsAnonymousDeclarationNumber(D) &&
 464       D->getDeclName().getNameKind() == DeclarationName::Identifier)
 465     AbbrevToUse = Writer.getDeclEnumAbbrev();
 466
 467   Code = serialization::DECL_ENUM;
 468 }
 469
 470 void ASTDeclWriter::VisitRecordDecl(RecordDecl *D) {
 471   VisitTagDecl(D);
 472   Record.push_back(D->hasFlexibleArrayMember());
 473   Record.push_back(D->isAnonymousStructOrUnion());
 474   Record.push_back(D->hasObjectMember());
 475   Record.push_back(D->hasVolatileMember());
 476   Record.push_back(D->isNonTrivialToPrimitiveDefaultInitialize());
 477   Record.push_back(D->isNonTrivialToPrimitiveCopy());
 478   Record.push_back(D->isNonTrivialToPrimitiveDestroy());
 479   Record.push_back(D->hasNonTrivialToPrimitiveDefaultInitializeCUnion());
 480   Record.push_back(D->hasNonTrivialToPrimitiveDestructCUnion());
 481   Record.push_back(D->hasNonTrivialToPrimitiveCopyCUnion());
 482   Record.push_back(D->isParamDestroyedInCallee());
 483   Record.push_back(D->getArgPassingRestrictions());
 484
 485   if (D->getDeclContext() == D->getLexicalDeclContext() &&
 486       !D->hasAttrs() &&
 487       !D->isImplicit() &&
 488       !D->isUsed(false) &&
 489       !D->hasExtInfo() &&
 490       !D->getTypedefNameForAnonDecl() &&
 491       D->getFirstDecl() == D->getMostRecentDecl() &&
 492       !D->isInvalidDecl() &&
 493       !D->isReferenced() &&
 494       !D->isTopLevelDeclInObjCContainer() &&
 495       D->getAccess() == AS_none &&
 496       !D->isModulePrivate() &&
 497       !CXXRecordDecl::classofKind(D->getKind()) &&
 498       !needsAnonymousDeclarationNumber(D) &&
 499       D->getDeclName().getNameKind() == DeclarationName::Identifier)
 500     AbbrevToUse = Writer.getDeclRecordAbbrev();
 501
 502   Code = serialization::DECL_RECORD;
 503 }
 504
 505 void ASTDeclWriter::VisitValueDecl(ValueDecl *D) {
 506   VisitNamedDecl(D);
 507   Record.AddTypeRef(D->getType());
 508 }
 509
 510 void ASTDeclWriter::VisitEnumConstantDecl(EnumConstantDecl *D) {
 511   VisitValueDecl(D);
 512   Record.push_back(D->getInitExpr()? 1 : 0);
 513   if (D->getInitExpr())
 514     Record.AddStmt(D->getInitExpr());
 515   Record.AddAPSInt(D->getInitVal());
 516
 517   Code = serialization::DECL_ENUM_CONSTANT;
 518 }
 519
 520 void ASTDeclWriter::VisitDeclaratorDecl(DeclaratorDecl *D) {
 521   VisitValueDecl(D);
 522   Record.AddSourceLocation(D->getInnerLocStart());
 523   Record.push_back(D->hasExtInfo());
 524   if (D->hasExtInfo())
 525     Record.AddQualifierInfo(*D->getExtInfo());
 526   // The location information is deferred until the end of the record.
 527   Record.AddTypeRef(D->getTypeSourceInfo() ? D->getTypeSourceInfo()->getType()
 528                                            : QualType());
 529 }
 530
 531 void ASTDeclWriter::VisitFunctionDecl(FunctionDecl *D) {
 532   VisitRedeclarable(D);
 533   VisitDeclaratorDecl(D);
 534   Record.AddDeclarationNameLoc(D->DNLoc, D->getDeclName());
 535   Record.push_back(D->getIdentifierNamespace());
 536
 537   // FunctionDecl's body is handled last at ASTWriterDecl::Visit,
 538   // after everything else is written.
 539   Record.push_back(static_cast<int>(D->getStorageClass())); // FIXME: stable encoding
 540   Record.push_back(D->isInlineSpecified());
 541   Record.push_back(D->isInlined());
 542   Record.push_back(D->isVirtualAsWritten());
 543   Record.push_back(D->isPure());
 544   Record.push_back(D->hasInheritedPrototype());
 545   Record.push_back(D->hasWrittenPrototype());
 546   Record.push_back(D->isDeletedBit());
 547   Record.push_back(D->isTrivial());
 548   Record.push_back(D->isTrivialForCall());
 549   Record.push_back(D->isDefaulted());
 550   Record.push_back(D->isExplicitlyDefaulted());
 551   Record.push_back(D->hasImplicitReturnZero());
 552   Record.push_back(D->getConstexprKind());
 553   Record.push_back(D->usesSEHTry());
 554   Record.push_back(D->hasSkippedBody());
 555   Record.push_back(D->isMultiVersion());
 556   Record.push_back(D->isLateTemplateParsed());
 557   Record.push_back(D->getLinkageInternal());
 558   Record.AddSourceLocation(D->getEndLoc());
 559
 560   Record.push_back(D->getODRHash());
 561
 562   Record.push_back(D->getTemplatedKind());
 563   switch (D->getTemplatedKind()) {
 564   case FunctionDecl::TK_NonTemplate:
 565     break;
 566   case FunctionDecl::TK_FunctionTemplate:
 567     Record.AddDeclRef(D->getDescribedFunctionTemplate());
 568     break;
 569   case FunctionDecl::TK_MemberSpecialization: {
 570     MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo();
 571     Record.AddDeclRef(MemberInfo->getInstantiatedFrom());
 572     Record.push_back(MemberInfo->getTemplateSpecializationKind());
 573     Record.AddSourceLocation(MemberInfo->getPointOfInstantiation());
 574     break;
 575   }
 576   case FunctionDecl::TK_FunctionTemplateSpecialization: {
 577     FunctionTemplateSpecializationInfo *
 578       FTSInfo = D->getTemplateSpecializationInfo();
 579
 580     RegisterTemplateSpecialization(FTSInfo->getTemplate(), D);
 581
 582     Record.AddDeclRef(FTSInfo->getTemplate());
 583     Record.push_back(FTSInfo->getTemplateSpecializationKind());
 584
 585     // Template arguments.
 586     Record.AddTemplateArgumentList(FTSInfo->TemplateArguments);
 587
 588     // Template args as written.
 589     Record.push_back(FTSInfo->TemplateArgumentsAsWritten != nullptr);
 590     if (FTSInfo->TemplateArgumentsAsWritten) {
 591       Record.push_back(FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs);
 592       for (int i=0, e = FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs;
 593              i!=e; ++i)
 594         Record.AddTemplateArgumentLoc(
 595             (*FTSInfo->TemplateArgumentsAsWritten)[i]);
 596       Record.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->LAngleLoc);
 597       Record.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->RAngleLoc);
 598     }
 599
 600     Record.AddSourceLocation(FTSInfo->getPointOfInstantiation());
 601
 602     if (MemberSpecializationInfo *MemberInfo =
 603         FTSInfo->getMemberSpecializationInfo()) {
 604       Record.push_back(1);
 605       Record.AddDeclRef(MemberInfo->getInstantiatedFrom());
 606       Record.push_back(MemberInfo->getTemplateSpecializationKind());
 607       Record.AddSourceLocation(MemberInfo->getPointOfInstantiation());
 608     } else {
 609       Record.push_back(0);
 610     }
 611
 612     if (D->isCanonicalDecl()) {
 613       // Write the template that contains the specializations set. We will
 614       // add a FunctionTemplateSpecializationInfo to it when reading.
 615       Record.AddDeclRef(FTSInfo->getTemplate()->getCanonicalDecl());
 616     }
 617     break;
 618   }
 619   case FunctionDecl::TK_DependentFunctionTemplateSpecialization: {
 620     DependentFunctionTemplateSpecializationInfo *
 621       DFTSInfo = D->getDependentSpecializationInfo();
 622
 623     // Templates.
 624     Record.push_back(DFTSInfo->getNumTemplates());
 625     for (int i=0, e = DFTSInfo->getNumTemplates(); i != e; ++i)
 626       Record.AddDeclRef(DFTSInfo->getTemplate(i));
 627
 628     // Templates args.
 629     Record.push_back(DFTSInfo->getNumTemplateArgs());
 630     for (int i=0, e = DFTSInfo->getNumTemplateArgs(); i != e; ++i)
 631       Record.AddTemplateArgumentLoc(DFTSInfo->getTemplateArg(i));
 632     Record.AddSourceLocation(DFTSInfo->getLAngleLoc());
 633     Record.AddSourceLocation(DFTSInfo->getRAngleLoc());
 634     break;
 635   }
 636   }
 637
 638   Record.push_back(D->param_size());
 639   for (auto P : D->parameters())
 640     Record.AddDeclRef(P);
 641   Code = serialization::DECL_FUNCTION;
 642 }
 643
 644 static void addExplicitSpecifier(ExplicitSpecifier ES,
 645                                  ASTRecordWriter &Record) {
 646   uint64_t Kind = static_cast<uint64_t>(ES.getKind());
 647   Kind = Kind << 1 | static_cast<bool>(ES.getExpr());
 648   Record.push_back(Kind);
 649   if (ES.getExpr()) {
 650     Record.AddStmt(ES.getExpr());
 651   }
 652 }
 653
 654 void ASTDeclWriter::VisitCXXDeductionGuideDecl(CXXDeductionGuideDecl *D) {
 655   addExplicitSpecifier(D->getExplicitSpecifier(), Record);
 656   VisitFunctionDecl(D);
 657   Record.push_back(D->isCopyDeductionCandidate());
 658   Code = serialization::DECL_CXX_DEDUCTION_GUIDE;
 659 }
 660
 661 void ASTDeclWriter::VisitObjCMethodDecl(ObjCMethodDecl *D) {
 662   VisitNamedDecl(D);
 663   // FIXME: convert to LazyStmtPtr?
 664   // Unlike C/C++, method bodies will never be in header files.
 665   bool HasBodyStuff = D->getBody() != nullptr     ||
 666                       D->getSelfDecl() != nullptr || D->getCmdDecl() != nullptr;
 667   Record.push_back(HasBodyStuff);
 668   if (HasBodyStuff) {
 669     Record.AddStmt(D->getBody());
 670     Record.AddDeclRef(D->getSelfDecl());
 671     Record.AddDeclRef(D->getCmdDecl());
 672   }
 673   Record.push_back(D->isInstanceMethod());
 674   Record.push_back(D->isVariadic());
 675   Record.push_back(D->isPropertyAccessor());
 676   Record.push_back(D->isDefined());
 677   Record.push_back(D->isOverriding());
 678   Record.push_back(D->hasSkippedBody());
 679
 680   Record.push_back(D->isRedeclaration());
 681   Record.push_back(D->hasRedeclaration());
 682   if (D->hasRedeclaration()) {
 683     assert(Context.getObjCMethodRedeclaration(D));
 684     Record.AddDeclRef(Context.getObjCMethodRedeclaration(D));
 685   }
 686
 687   // FIXME: stable encoding for @required/@optional
 688   Record.push_back(D->getImplementationControl());
 689   // FIXME: stable encoding for in/out/inout/bycopy/byref/oneway/nullability
 690   Record.push_back(D->getObjCDeclQualifier());
 691   Record.push_back(D->hasRelatedResultType());
 692   Record.AddTypeRef(D->getReturnType());
 693   Record.AddTypeSourceInfo(D->getReturnTypeSourceInfo());
 694   Record.AddSourceLocation(D->getEndLoc());
 695   Record.push_back(D->param_size());
 696   for (const auto *P : D->parameters())
 697     Record.AddDeclRef(P);
 698
 699   Record.push_back(D->getSelLocsKind());
 700   unsigned NumStoredSelLocs = D->getNumStoredSelLocs();
 701   SourceLocation *SelLocs = D->getStoredSelLocs();
 702   Record.push_back(NumStoredSelLocs);
 703   for (unsigned i = 0; i != NumStoredSelLocs; ++i)
 704     Record.AddSourceLocation(SelLocs[i]);
 705
 706   Code = serialization::DECL_OBJC_METHOD;
 707 }
 708
 709 void ASTDeclWriter::VisitObjCTypeParamDecl(ObjCTypeParamDecl *D) {
 710   VisitTypedefNameDecl(D);
 711   Record.push_back(D->Variance);
 712   Record.push_back(D->Index);
 713   Record.AddSourceLocation(D->VarianceLoc);
 714   Record.AddSourceLocation(D->ColonLoc);
 715
 716   Code = serialization::DECL_OBJC_TYPE_PARAM;
 717 }
 718
 719 void ASTDeclWriter::VisitObjCContainerDecl(ObjCContainerDecl *D) {
 720   VisitNamedDecl(D);
 721   Record.AddSourceLocation(D->getAtStartLoc());
 722   Record.AddSourceRange(D->getAtEndRange());
 723   // Abstract class (no need to define a stable serialization::DECL code).
 724 }
 725
 726 void ASTDeclWriter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *D) {
 727   VisitRedeclarable(D);
 728   VisitObjCContainerDecl(D);
 729   Record.AddTypeRef(QualType(D->getTypeForDecl(), 0));
 730   AddObjCTypeParamList(D->TypeParamList);
 731
 732   Record.push_back(D->isThisDeclarationADefinition());
 733   if (D->isThisDeclarationADefinition()) {
 734     // Write the DefinitionData
 735     ObjCInterfaceDecl::DefinitionData &Data = D->data();
 736
 737     Record.AddTypeSourceInfo(D->getSuperClassTInfo());
 738     Record.AddSourceLocation(D->getEndOfDefinitionLoc());
 739     Record.push_back(Data.HasDesignatedInitializers);
 740
 741     // Write out the protocols that are directly referenced by the @interface.
 742     Record.push_back(Data.ReferencedProtocols.size());
 743     for (const auto *P : D->protocols())
 744       Record.AddDeclRef(P);
 745     for (const auto &PL : D->protocol_locs())
 746       Record.AddSourceLocation(PL);
 747
 748     // Write out the protocols that are transitively referenced.
 749     Record.push_back(Data.AllReferencedProtocols.size());
 750     for (ObjCList<ObjCProtocolDecl>::iterator
 751               P = Data.AllReferencedProtocols.begin(),
 752            PEnd = Data.AllReferencedProtocols.end();
 753          P != PEnd; ++P)
 754       Record.AddDeclRef(*P);
 755
 756
 757     if (ObjCCategoryDecl *Cat = D->getCategoryListRaw()) {
 758       // Ensure that we write out the set of categories for this class.
 759       Writer.ObjCClassesWithCategories.insert(D);
 760
 761       // Make sure that the categories get serialized.
 762       for (; Cat; Cat = Cat->getNextClassCategoryRaw())
 763         (void)Writer.GetDeclRef(Cat);
 764     }
 765   }
 766
 767   Code = serialization::DECL_OBJC_INTERFACE;
 768 }
 769
 770 void ASTDeclWriter::VisitObjCIvarDecl(ObjCIvarDecl *D) {
 771   VisitFieldDecl(D);
 772   // FIXME: stable encoding for @public/@private/@protected/@package
 773   Record.push_back(D->getAccessControl());
 774   Record.push_back(D->getSynthesize());
 775
 776   if (D->getDeclContext() == D->getLexicalDeclContext() &&
 777       !D->hasAttrs() &&
 778       !D->isImplicit() &&
 779       !D->isUsed(false) &&
 780       !D->isInvalidDecl() &&
 781       !D->isReferenced() &&
 782       !D->isModulePrivate() &&
 783       !D->getBitWidth() &&
 784       !D->hasExtInfo() &&
 785       D->getDeclName())
 786     AbbrevToUse = Writer.getDeclObjCIvarAbbrev();
 787
 788   Code = serialization::DECL_OBJC_IVAR;
 789 }
 790
 791 void ASTDeclWriter::VisitObjCProtocolDecl(ObjCProtocolDecl *D) {
 792   VisitRedeclarable(D);
 793   VisitObjCContainerDecl(D);
 794
 795   Record.push_back(D->isThisDeclarationADefinition());
 796   if (D->isThisDeclarationADefinition()) {
 797     Record.push_back(D->protocol_size());
 798     for (const auto *I : D->protocols())
 799       Record.AddDeclRef(I);
 800     for (const auto &PL : D->protocol_locs())
 801       Record.AddSourceLocation(PL);
 802   }
 803
 804   Code = serialization::DECL_OBJC_PROTOCOL;
 805 }
 806
 807 void ASTDeclWriter::VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D) {
 808   VisitFieldDecl(D);
 809   Code = serialization::DECL_OBJC_AT_DEFS_FIELD;
 810 }
 811
 812 void ASTDeclWriter::VisitObjCCategoryDecl(ObjCCategoryDecl *D) {
 813   VisitObjCContainerDecl(D);
 814   Record.AddSourceLocation(D->getCategoryNameLoc());
 815   Record.AddSourceLocation(D->getIvarLBraceLoc());
 816   Record.AddSourceLocation(D->getIvarRBraceLoc());
 817   Record.AddDeclRef(D->getClassInterface());
 818   AddObjCTypeParamList(D->TypeParamList);
 819   Record.push_back(D->protocol_size());
 820   for (const auto *I : D->protocols())
 821     Record.AddDeclRef(I);
 822   for (const auto &PL : D->protocol_locs())
 823     Record.AddSourceLocation(PL);
 824   Code = serialization::DECL_OBJC_CATEGORY;
 825 }
 826
 827 void ASTDeclWriter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D) {
 828   VisitNamedDecl(D);
 829   Record.AddDeclRef(D->getClassInterface());
 830   Code = serialization::DECL_OBJC_COMPATIBLE_ALIAS;
 831 }
 832
 833 void ASTDeclWriter::VisitObjCPropertyDecl(ObjCPropertyDecl *D) {
 834   VisitNamedDecl(D);
 835   Record.AddSourceLocation(D->getAtLoc());
 836   Record.AddSourceLocation(D->getLParenLoc());
 837   Record.AddTypeRef(D->getType());
 838   Record.AddTypeSourceInfo(D->getTypeSourceInfo());
 839   // FIXME: stable encoding
 840   Record.push_back((unsigned)D->getPropertyAttributes());
 841   Record.push_back((unsigned)D->getPropertyAttributesAsWritten());
 842   // FIXME: stable encoding
 843   Record.push_back((unsigned)D->getPropertyImplementation());
 844   Record.AddDeclarationName(D->getGetterName());
 845   Record.AddSourceLocation(D->getGetterNameLoc());
 846   Record.AddDeclarationName(D->getSetterName());
 847   Record.AddSourceLocation(D->getSetterNameLoc());
 848   Record.AddDeclRef(D->getGetterMethodDecl());
 849   Record.AddDeclRef(D->getSetterMethodDecl());
 850   Record.AddDeclRef(D->getPropertyIvarDecl());
 851   Code = serialization::DECL_OBJC_PROPERTY;
 852 }
 853
 854 void ASTDeclWriter::VisitObjCImplDecl(ObjCImplDecl *D) {
 855   VisitObjCContainerDecl(D);
 856   Record.AddDeclRef(D->getClassInterface());
 857   // Abstract class (no need to define a stable serialization::DECL code).
 858 }
 859
 860 void ASTDeclWriter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D) {
 861   VisitObjCImplDecl(D);
 862   Record.AddSourceLocation(D->getCategoryNameLoc());
 863   Code = serialization::DECL_OBJC_CATEGORY_IMPL;
 864 }
 865
 866 void ASTDeclWriter::VisitObjCImplementationDecl(ObjCImplementationDecl *D) {
 867   VisitObjCImplDecl(D);
 868   Record.AddDeclRef(D->getSuperClass());
 869   Record.AddSourceLocation(D->getSuperClassLoc());
 870   Record.AddSourceLocation(D->getIvarLBraceLoc());
 871   Record.AddSourceLocation(D->getIvarRBraceLoc());
 872   Record.push_back(D->hasNonZeroConstructors());
 873   Record.push_back(D->hasDestructors());
 874   Record.push_back(D->NumIvarInitializers);
 875   if (D->NumIvarInitializers)
 876     Record.AddCXXCtorInitializers(
 877         llvm::makeArrayRef(D->init_begin(), D->init_end()));
 878   Code = serialization::DECL_OBJC_IMPLEMENTATION;
 879 }
 880
 881 void ASTDeclWriter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D) {
 882   VisitDecl(D);
 883   Record.AddSourceLocation(D->getBeginLoc());
 884   Record.AddDeclRef(D->getPropertyDecl());
 885   Record.AddDeclRef(D->getPropertyIvarDecl());
 886   Record.AddSourceLocation(D->getPropertyIvarDeclLoc());
 887   Record.AddStmt(D->getGetterCXXConstructor());
 888   Record.AddStmt(D->getSetterCXXAssignment());
 889   Code = serialization::DECL_OBJC_PROPERTY_IMPL;
 890 }
 891
 892 void ASTDeclWriter::VisitFieldDecl(FieldDecl *D) {
 893   VisitDeclaratorDecl(D);
 894   Record.push_back(D->isMutable());
 895
 896   FieldDecl::InitStorageKind ISK = D->InitStorage.getInt();
 897   Record.push_back(ISK);
 898   if (ISK == FieldDecl::ISK_CapturedVLAType)
 899     Record.AddTypeRef(QualType(D->getCapturedVLAType(), 0));
 900   else if (ISK)
 901     Record.AddStmt(D->getInClassInitializer());
 902
 903   Record.AddStmt(D->getBitWidth());
 904
 905   if (!D->getDeclName())
 906     Record.AddDeclRef(Context.getInstantiatedFromUnnamedFieldDecl(D));
 907
 908   if (D->getDeclContext() == D->getLexicalDeclContext() &&
 909       !D->hasAttrs() &&
 910       !D->isImplicit() &&
 911       !D->isUsed(false) &&
 912       !D->isInvalidDecl() &&
 913       !D->isReferenced() &&
 914       !D->isTopLevelDeclInObjCContainer() &&
 915       !D->isModulePrivate() &&
 916       !D->getBitWidth() &&
 917       !D->hasInClassInitializer() &&
 918       !D->hasCapturedVLAType() &&
 919       !D->hasExtInfo() &&
 920       !ObjCIvarDecl::classofKind(D->getKind()) &&
 921       !ObjCAtDefsFieldDecl::classofKind(D->getKind()) &&
 922       D->getDeclName())
 923     AbbrevToUse = Writer.getDeclFieldAbbrev();
 924
 925   Code = serialization::DECL_FIELD;
 926 }
 927
 928 void ASTDeclWriter::VisitMSPropertyDecl(MSPropertyDecl *D) {
 929   VisitDeclaratorDecl(D);
 930   Record.AddIdentifierRef(D->getGetterId());
 931   Record.AddIdentifierRef(D->getSetterId());
 932   Code = serialization::DECL_MS_PROPERTY;
 933 }
 934
 935 void ASTDeclWriter::VisitIndirectFieldDecl(IndirectFieldDecl *D) {
 936   VisitValueDecl(D);
 937   Record.push_back(D->getChainingSize());
 938
 939   for (const auto *P : D->chain())
 940     Record.AddDeclRef(P);
 941   Code = serialization::DECL_INDIRECTFIELD;
 942 }
 943
 944 void ASTDeclWriter::VisitVarDecl(VarDecl *D) {
 945   VisitRedeclarable(D);
 946   VisitDeclaratorDecl(D);
 947   Record.push_back(D->getStorageClass());
 948   Record.push_back(D->getTSCSpec());
 949   Record.push_back(D->getInitStyle());
 950   Record.push_back(D->isARCPseudoStrong());
 951   if (!isa<ParmVarDecl>(D)) {
 952     Record.push_back(D->isThisDeclarationADemotedDefinition());
 953     Record.push_back(D->isExceptionVariable());
 954     Record.push_back(D->isNRVOVariable());
 955     Record.push_back(D->isCXXForRangeDecl());
 956     Record.push_back(D->isObjCForDecl());
 957     Record.push_back(D->isInline());
 958     Record.push_back(D->isInlineSpecified());
 959     Record.push_back(D->isConstexpr());
 960     Record.push_back(D->isInitCapture());
 961     Record.push_back(D->isPreviousDeclInSameBlockScope());
 962     if (const auto *IPD = dyn_cast<ImplicitParamDecl>(D))
 963       Record.push_back(static_cast<unsigned>(IPD->getParameterKind()));
 964     else
 965       Record.push_back(0);
 966     Record.push_back(D->isEscapingByref());
 967   }
 968   Record.push_back(D->getLinkageInternal());
 969
 970   if (D->getInit()) {
 971     if (!D->isInitKnownICE())
 972       Record.push_back(1);
 973     else {
 974       Record.push_back(
 975           2 |
 976           (D->isInitICE() ? 1 : 0) |
 977           (D->ensureEvaluatedStmt()->HasConstantDestruction ? 4 : 0));
 978     }
 979     Record.AddStmt(D->getInit());
 980   } else {
 981     Record.push_back(0);
 982   }
 983
 984   if (D->hasAttr<BlocksAttr>() && D->getType()->getAsCXXRecordDecl()) {
 985     ASTContext::BlockVarCopyInit Init = Writer.Context->getBlockVarCopyInit(D);
 986     Record.AddStmt(Init.getCopyExpr());
 987     if (Init.getCopyExpr())
 988       Record.push_back(Init.canThrow());
 989   }
 990
 991   if (D->getStorageDuration() == SD_Static) {
 992     bool ModulesCodegen = false;
 993     if (Writer.WritingModule &&
 994         !D->getDescribedVarTemplate() && !D->getMemberSpecializationInfo() &&
 995         !isa<VarTemplateSpecializationDecl>(D)) {
 996       // When building a C++ Modules TS module interface unit, a strong
 997       // definition in the module interface is provided by the compilation of
 998       // that module interface unit, not by its users. (Inline variables are
 999       // still emitted in module users.)
1000       ModulesCodegen =
1001           (Writer.WritingModule->Kind == Module::ModuleInterfaceUnit &&
1002            Writer.Context->GetGVALinkageForVariable(D) == GVA_StrongExternal);
1003     }
1004     Record.push_back(ModulesCodegen);
1005     if (ModulesCodegen)
1006       Writer.ModularCodegenDecls.push_back(Writer.GetDeclRef(D));
1007   }
1008
1009   enum {
1010     VarNotTemplate = 0, VarTemplate, StaticDataMemberSpecialization
1011   };
1012   if (VarTemplateDecl *TemplD = D->getDescribedVarTemplate()) {
1013     Record.push_back(VarTemplate);
1014     Record.AddDeclRef(TemplD);
1015   } else if (MemberSpecializationInfo *SpecInfo
1016                = D->getMemberSpecializationInfo()) {
1017     Record.push_back(StaticDataMemberSpecialization);
1018     Record.AddDeclRef(SpecInfo->getInstantiatedFrom());
1019     Record.push_back(SpecInfo->getTemplateSpecializationKind());
1020     Record.AddSourceLocation(SpecInfo->getPointOfInstantiation());
1021   } else {
1022     Record.push_back(VarNotTemplate);
1023   }
1024
1025   if (D->getDeclContext() == D->getLexicalDeclContext() &&
1026       !D->hasAttrs() &&
1027       !D->isImplicit() &&
1028       !D->isUsed(false) &&
1029       !D->isInvalidDecl() &&
1030       !D->isReferenced() &&
1031       !D->isTopLevelDeclInObjCContainer() &&
1032       D->getAccess() == AS_none &&
1033       !D->isModulePrivate() &&
1034       !needsAnonymousDeclarationNumber(D) &&
1035       D->getDeclName().getNameKind() == DeclarationName::Identifier &&
1036       !D->hasExtInfo() &&
1037       D->getFirstDecl() == D->getMostRecentDecl() &&
1038       D->getKind() == Decl::Var &&
1039       !D->isInline() &&
1040       !D->isConstexpr() &&
1041       !D->isInitCapture() &&
1042       !D->isPreviousDeclInSameBlockScope() &&
1043       !(D->hasAttr<BlocksAttr>() && D->getType()->getAsCXXRecordDecl()) &&
1044       !D->isEscapingByref() &&
1045       D->getStorageDuration() != SD_Static &&
1046       !D->getMemberSpecializationInfo())
1047     AbbrevToUse = Writer.getDeclVarAbbrev();
1048
1049   Code = serialization::DECL_VAR;
1050 }
1051
1052 void ASTDeclWriter::VisitImplicitParamDecl(ImplicitParamDecl *D) {
1053   VisitVarDecl(D);
1054   Code = serialization::DECL_IMPLICIT_PARAM;
1055 }
1056
1057 void ASTDeclWriter::VisitParmVarDecl(ParmVarDecl *D) {
1058   VisitVarDecl(D);
1059   Record.push_back(D->isObjCMethodParameter());
1060   Record.push_back(D->getFunctionScopeDepth());
1061   Record.push_back(D->getFunctionScopeIndex());
1062   Record.push_back(D->getObjCDeclQualifier()); // FIXME: stable encoding
1063   Record.push_back(D->isKNRPromoted());
1064   Record.push_back(D->hasInheritedDefaultArg());
1065   Record.push_back(D->hasUninstantiatedDefaultArg());
1066   if (D->hasUninstantiatedDefaultArg())
1067     Record.AddStmt(D->getUninstantiatedDefaultArg());
1068   Code = serialization::DECL_PARM_VAR;
1069
1070   assert(!D->isARCPseudoStrong()); // can be true of ImplicitParamDecl
1071
1072   // If the assumptions about the DECL_PARM_VAR abbrev are true, use it.  Here
1073   // we dynamically check for the properties that we optimize for, but don't
1074   // know are true of all PARM_VAR_DECLs.
1075   if (D->getDeclContext() == D->getLexicalDeclContext() &&
1076       !D->hasAttrs() &&
1077       !D->hasExtInfo() &&
1078       !D->isImplicit() &&
1079       !D->isUsed(false) &&
1080       !D->isInvalidDecl() &&
1081       !D->isReferenced() &&
1082       D->getAccess() == AS_none &&
1083       !D->isModulePrivate() &&
1084       D->getStorageClass() == 0 &&
1085       D->getInitStyle() == VarDecl::CInit && // Can params have anything else?
1086       D->getFunctionScopeDepth() == 0 &&
1087       D->getObjCDeclQualifier() == 0 &&
1088       !D->isKNRPromoted() &&
1089       !D->hasInheritedDefaultArg() &&
1090       D->getInit() == nullptr &&
1091       !D->hasUninstantiatedDefaultArg())  // No default expr.
1092     AbbrevToUse = Writer.getDeclParmVarAbbrev();
1093
1094   // Check things we know are true of *every* PARM_VAR_DECL, which is more than
1095   // just us assuming it.
1096   assert(!D->getTSCSpec() && "PARM_VAR_DECL can't use TLS");
1097   assert(!D->isThisDeclarationADemotedDefinition()
1098          && "PARM_VAR_DECL can't be demoted definition.");
1099   assert(D->getAccess() == AS_none && "PARM_VAR_DECL can't be public/private");
1100   assert(!D->isExceptionVariable() && "PARM_VAR_DECL can't be exception var");
1101   assert(D->getPreviousDecl() == nullptr && "PARM_VAR_DECL can't be redecl");
1102   assert(!D->isStaticDataMember() &&
1103          "PARM_VAR_DECL can't be static data member");
1104 }
1105
1106 void ASTDeclWriter::VisitDecompositionDecl(DecompositionDecl *D) {
1107   // Record the number of bindings first to simplify deserialization.
1108   Record.push_back(D->bindings().size());
1109
1110   VisitVarDecl(D);
1111   for (auto *B : D->bindings())
1112     Record.AddDeclRef(B);
1113   Code = serialization::DECL_DECOMPOSITION;
1114 }
1115
1116 void ASTDeclWriter::VisitBindingDecl(BindingDecl *D) {
1117   VisitValueDecl(D);
1118   Record.AddStmt(D->getBinding());
1119   Code = serialization::DECL_BINDING;
1120 }
1121
1122 void ASTDeclWriter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
1123   VisitDecl(D);
1124   Record.AddStmt(D->getAsmString());
1125   Record.AddSourceLocation(D->getRParenLoc());
1126   Code = serialization::DECL_FILE_SCOPE_ASM;
1127 }
1128
1129 void ASTDeclWriter::VisitEmptyDecl(EmptyDecl *D) {
1130   VisitDecl(D);
1131   Code = serialization::DECL_EMPTY;
1132 }
1133
1134 void ASTDeclWriter::VisitBlockDecl(BlockDecl *D) {
1135   VisitDecl(D);
1136   Record.AddStmt(D->getBody());
1137   Record.AddTypeSourceInfo(D->getSignatureAsWritten());
1138   Record.push_back(D->param_size());
1139   for (ParmVarDecl *P : D->parameters())
1140     Record.AddDeclRef(P);
1141   Record.push_back(D->isVariadic());
1142   Record.push_back(D->blockMissingReturnType());
1143   Record.push_back(D->isConversionFromLambda());
1144   Record.push_back(D->doesNotEscape());
1145   Record.push_back(D->canAvoidCopyToHeap());
1146   Record.push_back(D->capturesCXXThis());
1147   Record.push_back(D->getNumCaptures());
1148   for (const auto &capture : D->captures()) {
1149     Record.AddDeclRef(capture.getVariable());
1150
1151     unsigned flags = 0;
1152     if (capture.isByRef()) flags |= 1;
1153     if (capture.isNested()) flags |= 2;
1154     if (capture.hasCopyExpr()) flags |= 4;
1155     Record.push_back(flags);
1156
1157     if (capture.hasCopyExpr()) Record.AddStmt(capture.getCopyExpr());
1158   }
1159
1160   Code = serialization::DECL_BLOCK;
1161 }
1162
1163 void ASTDeclWriter::VisitCapturedDecl(CapturedDecl *CD) {
1164   Record.push_back(CD->getNumParams());
1165   VisitDecl(CD);
1166   Record.push_back(CD->getContextParamPosition());
1167   Record.push_back(CD->isNothrow() ? 1 : 0);
1168   // Body is stored by VisitCapturedStmt.
1169   for (unsigned I = 0; I < CD->getNumParams(); ++I)
1170     Record.AddDeclRef(CD->getParam(I));
1171   Code = serialization::DECL_CAPTURED;
1172 }
1173
1174 void ASTDeclWriter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
1175   VisitDecl(D);
1176   Record.push_back(D->getLanguage());
1177   Record.AddSourceLocation(D->getExternLoc());
1178   Record.AddSourceLocation(D->getRBraceLoc());
1179   Code = serialization::DECL_LINKAGE_SPEC;
1180 }
1181
1182 void ASTDeclWriter::VisitExportDecl(ExportDecl *D) {
1183   VisitDecl(D);
1184   Record.AddSourceLocation(D->getRBraceLoc());
1185   Code = serialization::DECL_EXPORT;
1186 }
1187
1188 void ASTDeclWriter::VisitLabelDecl(LabelDecl *D) {
1189   VisitNamedDecl(D);
1190   Record.AddSourceLocation(D->getBeginLoc());
1191   Code = serialization::DECL_LABEL;
1192 }
1193
1194
1195 void ASTDeclWriter::VisitNamespaceDecl(NamespaceDecl *D) {
1196   VisitRedeclarable(D);
1197   VisitNamedDecl(D);
1198   Record.push_back(D->isInline());
1199   Record.AddSourceLocation(D->getBeginLoc());
1200   Record.AddSourceLocation(D->getRBraceLoc());
1201
1202   if (D->isOriginalNamespace())
1203     Record.AddDeclRef(D->getAnonymousNamespace());
1204   Code = serialization::DECL_NAMESPACE;
1205
1206   if (Writer.hasChain() && D->isAnonymousNamespace() &&
1207       D == D->getMostRecentDecl()) {
1208     // This is a most recent reopening of the anonymous namespace. If its parent
1209     // is in a previous PCH (or is the TU), mark that parent for update, because
1210     // the original namespace always points to the latest re-opening of its
1211     // anonymous namespace.
1212     Decl *Parent = cast<Decl>(
1213         D->getParent()->getRedeclContext()->getPrimaryContext());
1214     if (Parent->isFromASTFile() || isa<TranslationUnitDecl>(Parent)) {
1215       Writer.DeclUpdates[Parent].push_back(
1216           ASTWriter::DeclUpdate(UPD_CXX_ADDED_ANONYMOUS_NAMESPACE, D));
1217     }
1218   }
1219 }
1220
1221 void ASTDeclWriter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
1222   VisitRedeclarable(D);
1223   VisitNamedDecl(D);
1224   Record.AddSourceLocation(D->getNamespaceLoc());
1225   Record.AddSourceLocation(D->getTargetNameLoc());
1226   Record.AddNestedNameSpecifierLoc(D->getQualifierLoc());
1227   Record.AddDeclRef(D->getNamespace());
1228   Code = serialization::DECL_NAMESPACE_ALIAS;
1229 }
1230
1231 void ASTDeclWriter::VisitUsingDecl(UsingDecl *D) {
1232   VisitNamedDecl(D);
1233   Record.AddSourceLocation(D->getUsingLoc());
1234   Record.AddNestedNameSpecifierLoc(D->getQualifierLoc());
1235   Record.AddDeclarationNameLoc(D->DNLoc, D->getDeclName());
1236   Record.AddDeclRef(D->FirstUsingShadow.getPointer());
1237   Record.push_back(D->hasTypename());
1238   Record.AddDeclRef(Context.getInstantiatedFromUsingDecl(D));
1239   Code = serialization::DECL_USING;
1240 }
1241
1242 void ASTDeclWriter::VisitUsingPackDecl(UsingPackDecl *D) {
1243   Record.push_back(D->NumExpansions);
1244   VisitNamedDecl(D);
1245   Record.AddDeclRef(D->getInstantiatedFromUsingDecl());
1246   for (auto *E : D->expansions())
1247     Record.AddDeclRef(E);
1248   Code = serialization::DECL_USING_PACK;
1249 }
1250
1251 void ASTDeclWriter::VisitUsingShadowDecl(UsingShadowDecl *D) {
1252   VisitRedeclarable(D);
1253   VisitNamedDecl(D);
1254   Record.AddDeclRef(D->getTargetDecl());
1255   Record.push_back(D->getIdentifierNamespace());
1256   Record.AddDeclRef(D->UsingOrNextShadow);
1257   Record.AddDeclRef(Context.getInstantiatedFromUsingShadowDecl(D));
1258   Code = serialization::DECL_USING_SHADOW;
1259 }
1260
1261 void ASTDeclWriter::VisitConstructorUsingShadowDecl(
1262     ConstructorUsingShadowDecl *D) {
1263   VisitUsingShadowDecl(D);
1264   Record.AddDeclRef(D->NominatedBaseClassShadowDecl);
1265   Record.AddDeclRef(D->ConstructedBaseClassShadowDecl);
1266   Record.push_back(D->IsVirtual);
1267   Code = serialization::DECL_CONSTRUCTOR_USING_SHADOW;
1268 }
1269
1270 void ASTDeclWriter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
1271   VisitNamedDecl(D);
1272   Record.AddSourceLocation(D->getUsingLoc());
1273   Record.AddSourceLocation(D->getNamespaceKeyLocation());
1274   Record.AddNestedNameSpecifierLoc(D->getQualifierLoc());
1275   Record.AddDeclRef(D->getNominatedNamespace());
1276   Record.AddDeclRef(dyn_cast<Decl>(D->getCommonAncestor()));
1277   Code = serialization::DECL_USING_DIRECTIVE;
1278 }
1279
1280 void ASTDeclWriter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
1281   VisitValueDecl(D);
1282   Record.AddSourceLocation(D->getUsingLoc());
1283   Record.AddNestedNameSpecifierLoc(D->getQualifierLoc());
1284   Record.AddDeclarationNameLoc(D->DNLoc, D->getDeclName());
1285   Record.AddSourceLocation(D->getEllipsisLoc());
1286   Code = serialization::DECL_UNRESOLVED_USING_VALUE;
1287 }
1288
1289 void ASTDeclWriter::VisitUnresolvedUsingTypenameDecl(
1290                                                UnresolvedUsingTypenameDecl *D) {
1291   VisitTypeDecl(D);
1292   Record.AddSourceLocation(D->getTypenameLoc());
1293   Record.AddNestedNameSpecifierLoc(D->getQualifierLoc());
1294   Record.AddSourceLocation(D->getEllipsisLoc());
1295   Code = serialization::DECL_UNRESOLVED_USING_TYPENAME;
1296 }
1297
1298 void ASTDeclWriter::VisitCXXRecordDecl(CXXRecordDecl *D) {
1299   VisitRecordDecl(D);
1300
1301   enum {
1302     CXXRecNotTemplate = 0, CXXRecTemplate, CXXRecMemberSpecialization
1303   };
1304   if (ClassTemplateDecl *TemplD = D->getDescribedClassTemplate()) {
1305     Record.push_back(CXXRecTemplate);
1306     Record.AddDeclRef(TemplD);
1307   } else if (MemberSpecializationInfo *MSInfo
1308                = D->getMemberSpecializationInfo()) {
1309     Record.push_back(CXXRecMemberSpecialization);
1310     Record.AddDeclRef(MSInfo->getInstantiatedFrom());
1311     Record.push_back(MSInfo->getTemplateSpecializationKind());
1312     Record.AddSourceLocation(MSInfo->getPointOfInstantiation());
1313   } else {
1314     Record.push_back(CXXRecNotTemplate);
1315   }
1316
1317   Record.push_back(D->isThisDeclarationADefinition());
1318   if (D->isThisDeclarationADefinition())
1319     Record.AddCXXDefinitionData(D);
1320
1321   // Store (what we currently believe to be) the key function to avoid
1322   // deserializing every method so we can compute it.
1323   if (D->isCompleteDefinition())
1324     Record.AddDeclRef(Context.getCurrentKeyFunction(D));
1325
1326   Code = serialization::DECL_CXX_RECORD;
1327 }
1328
1329 void ASTDeclWriter::VisitCXXMethodDecl(CXXMethodDecl *D) {
1330   VisitFunctionDecl(D);
1331   if (D->isCanonicalDecl()) {
1332     Record.push_back(D->size_overridden_methods());
1333     for (const CXXMethodDecl *MD : D->overridden_methods())
1334       Record.AddDeclRef(MD);
1335   } else {
1336     // We only need to record overridden methods once for the canonical decl.
1337     Record.push_back(0);
1338   }
1339
1340   if (D->getDeclContext() == D->getLexicalDeclContext() &&
1341       D->getFirstDecl() == D->getMostRecentDecl() &&
1342       !D->isInvalidDecl() &&
1343       !D->hasAttrs() &&
1344       !D->isTopLevelDeclInObjCContainer() &&
1345       D->getDeclName().getNameKind() == DeclarationName::Identifier &&
1346       !D->hasExtInfo() &&
1347       !D->hasInheritedPrototype() &&
1348       D->hasWrittenPrototype())
1349     AbbrevToUse = Writer.getDeclCXXMethodAbbrev();
1350
1351   Code = serialization::DECL_CXX_METHOD;
1352 }
1353
1354 void ASTDeclWriter::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
1355   Record.push_back(D->getTraillingAllocKind());
1356   addExplicitSpecifier(D->getExplicitSpecifier(), Record);
1357   if (auto Inherited = D->getInheritedConstructor()) {
1358     Record.AddDeclRef(Inherited.getShadowDecl());
1359     Record.AddDeclRef(Inherited.getConstructor());
1360   }
1361
1362   VisitCXXMethodDecl(D);
1363   Code = serialization::DECL_CXX_CONSTRUCTOR;
1364 }
1365
1366 void ASTDeclWriter::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
1367   VisitCXXMethodDecl(D);
1368
1369   Record.AddDeclRef(D->getOperatorDelete());
1370   if (D->getOperatorDelete())
1371     Record.AddStmt(D->getOperatorDeleteThisArg());
1372
1373   Code = serialization::DECL_CXX_DESTRUCTOR;
1374 }
1375
1376 void ASTDeclWriter::VisitCXXConversionDecl(CXXConversionDecl *D) {
1377   addExplicitSpecifier(D->getExplicitSpecifier(), Record);
1378   VisitCXXMethodDecl(D);
1379   Code = serialization::DECL_CXX_CONVERSION;
1380 }
1381
1382 void ASTDeclWriter::VisitImportDecl(ImportDecl *D) {
1383   VisitDecl(D);
1384   Record.push_back(Writer.getSubmoduleID(D->getImportedModule()));
1385   ArrayRef<SourceLocation> IdentifierLocs = D->getIdentifierLocs();
1386   Record.push_back(!IdentifierLocs.empty());
1387   if (IdentifierLocs.empty()) {
1388     Record.AddSourceLocation(D->getEndLoc());
1389     Record.push_back(1);
1390   } else {
1391     for (unsigned I = 0, N = IdentifierLocs.size(); I != N; ++I)
1392       Record.AddSourceLocation(IdentifierLocs[I]);
1393     Record.push_back(IdentifierLocs.size());
1394   }
1395   // Note: the number of source locations must always be the last element in
1396   // the record.
1397   Code = serialization::DECL_IMPORT;
1398 }
1399
1400 void ASTDeclWriter::VisitAccessSpecDecl(AccessSpecDecl *D) {
1401   VisitDecl(D);
1402   Record.AddSourceLocation(D->getColonLoc());
1403   Code = serialization::DECL_ACCESS_SPEC;
1404 }
1405
1406 void ASTDeclWriter::VisitFriendDecl(FriendDecl *D) {
1407   // Record the number of friend type template parameter lists here
1408   // so as to simplify memory allocation during deserialization.
1409   Record.push_back(D->NumTPLists);
1410   VisitDecl(D);
1411   bool hasFriendDecl = D->Friend.is<NamedDecl*>();
1412   Record.push_back(hasFriendDecl);
1413   if (hasFriendDecl)
1414     Record.AddDeclRef(D->getFriendDecl());
1415   else
1416     Record.AddTypeSourceInfo(D->getFriendType());
1417   for (unsigned i = 0; i < D->NumTPLists; ++i)
1418     Record.AddTemplateParameterList(D->getFriendTypeTemplateParameterList(i));
1419   Record.AddDeclRef(D->getNextFriend());
1420   Record.push_back(D->UnsupportedFriend);
1421   Record.AddSourceLocation(D->FriendLoc);
1422   Code = serialization::DECL_FRIEND;
1423 }
1424
1425 void ASTDeclWriter::VisitFriendTemplateDecl(FriendTemplateDecl *D) {
1426   VisitDecl(D);
1427   Record.push_back(D->getNumTemplateParameters());
1428   for (unsigned i = 0, e = D->getNumTemplateParameters(); i != e; ++i)
1429     Record.AddTemplateParameterList(D->getTemplateParameterList(i));
1430   Record.push_back(D->getFriendDecl() != nullptr);
1431   if (D->getFriendDecl())
1432     Record.AddDeclRef(D->getFriendDecl());
1433   else
1434     Record.AddTypeSourceInfo(D->getFriendType());
1435   Record.AddSourceLocation(D->getFriendLoc());
1436   Code = serialization::DECL_FRIEND_TEMPLATE;
1437 }
1438
1439 void ASTDeclWriter::VisitTemplateDecl(TemplateDecl *D) {
1440   VisitNamedDecl(D);
1441
1442   Record.AddDeclRef(D->getTemplatedDecl());
1443   Record.AddTemplateParameterList(D->getTemplateParameters());
1444 }
1445
1446 void ASTDeclWriter::VisitConceptDecl(ConceptDecl *D) {
1447   VisitTemplateDecl(D);
1448   Record.AddStmt(D->getConstraintExpr());
1449   Code = serialization::DECL_CONCEPT;
1450 }
1451
1452 void ASTDeclWriter::VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D) {
1453   VisitRedeclarable(D);
1454
1455   // Emit data to initialize CommonOrPrev before VisitTemplateDecl so that
1456   // getCommonPtr() can be used while this is still initializing.
1457   if (D->isFirstDecl()) {
1458     // This declaration owns the 'common' pointer, so serialize that data now.
1459     Record.AddDeclRef(D->getInstantiatedFromMemberTemplate());
1460     if (D->getInstantiatedFromMemberTemplate())
1461       Record.push_back(D->isMemberSpecialization());
1462   }
1463
1464   VisitTemplateDecl(D);
1465   Record.push_back(D->getIdentifierNamespace());
1466 }
1467
1468 void ASTDeclWriter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1469   VisitRedeclarableTemplateDecl(D);
1470
1471   if (D->isFirstDecl())
1472     AddTemplateSpecializations(D);
1473   Code = serialization::DECL_CLASS_TEMPLATE;
1474 }
1475
1476 void ASTDeclWriter::VisitClassTemplateSpecializationDecl(
1477                                            ClassTemplateSpecializationDecl *D) {
1478   RegisterTemplateSpecialization(D->getSpecializedTemplate(), D);
1479
1480   VisitCXXRecordDecl(D);
1481
1482   llvm::PointerUnion<ClassTemplateDecl *,
1483                      ClassTemplatePartialSpecializationDecl *> InstFrom
1484     = D->getSpecializedTemplateOrPartial();
1485   if (Decl *InstFromD = InstFrom.dyn_cast<ClassTemplateDecl *>()) {
1486     Record.AddDeclRef(InstFromD);
1487   } else {
1488     Record.AddDeclRef(InstFrom.get<ClassTemplatePartialSpecializationDecl *>());
1489     Record.AddTemplateArgumentList(&D->getTemplateInstantiationArgs());
1490   }
1491
1492   Record.AddTemplateArgumentList(&D->getTemplateArgs());
1493   Record.AddSourceLocation(D->getPointOfInstantiation());
1494   Record.push_back(D->getSpecializationKind());
1495   Record.push_back(D->isCanonicalDecl());
1496
1497   if (D->isCanonicalDecl()) {
1498     // When reading, we'll add it to the folding set of the following template.
1499     Record.AddDeclRef(D->getSpecializedTemplate()->getCanonicalDecl());
1500   }
1501
1502   // Explicit info.
1503   Record.AddTypeSourceInfo(D->getTypeAsWritten());
1504   if (D->getTypeAsWritten()) {
1505     Record.AddSourceLocation(D->getExternLoc());
1506     Record.AddSourceLocation(D->getTemplateKeywordLoc());
1507   }
1508
1509   Code = serialization::DECL_CLASS_TEMPLATE_SPECIALIZATION;
1510 }
1511
1512 void ASTDeclWriter::VisitClassTemplatePartialSpecializationDecl(
1513                                     ClassTemplatePartialSpecializationDecl *D) {
1514   VisitClassTemplateSpecializationDecl(D);
1515
1516   Record.AddTemplateParameterList(D->getTemplateParameters());
1517   Record.AddASTTemplateArgumentListInfo(D->getTemplateArgsAsWritten());
1518
1519   // These are read/set from/to the first declaration.
1520   if (D->getPreviousDecl() == nullptr) {
1521     Record.AddDeclRef(D->getInstantiatedFromMember());
1522     Record.push_back(D->isMemberSpecialization());
1523   }
1524
1525   Code = serialization::DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION;
1526 }
1527
1528 void ASTDeclWriter::VisitVarTemplateDecl(VarTemplateDecl *D) {
1529   VisitRedeclarableTemplateDecl(D);
1530
1531   if (D->isFirstDecl())
1532     AddTemplateSpecializations(D);
1533   Code = serialization::DECL_VAR_TEMPLATE;
1534 }
1535
1536 void ASTDeclWriter::VisitVarTemplateSpecializationDecl(
1537     VarTemplateSpecializationDecl *D) {
1538   RegisterTemplateSpecialization(D->getSpecializedTemplate(), D);
1539
1540   VisitVarDecl(D);
1541
1542   llvm::PointerUnion<VarTemplateDecl *, VarTemplatePartialSpecializationDecl *>
1543   InstFrom = D->getSpecializedTemplateOrPartial();
1544   if (Decl *InstFromD = InstFrom.dyn_cast<VarTemplateDecl *>()) {
1545     Record.AddDeclRef(InstFromD);
1546   } else {
1547     Record.AddDeclRef(InstFrom.get<VarTemplatePartialSpecializationDecl *>());
1548     Record.AddTemplateArgumentList(&D->getTemplateInstantiationArgs());
1549   }
1550
1551   // Explicit info.
1552   Record.AddTypeSourceInfo(D->getTypeAsWritten());
1553   if (D->getTypeAsWritten()) {
1554     Record.AddSourceLocation(D->getExternLoc());
1555     Record.AddSourceLocation(D->getTemplateKeywordLoc());
1556   }
1557
1558   Record.AddTemplateArgumentList(&D->getTemplateArgs());
1559   Record.AddSourceLocation(D->getPointOfInstantiation());
1560   Record.push_back(D->getSpecializationKind());
1561   Record.push_back(D->IsCompleteDefinition);
1562   Record.push_back(D->isCanonicalDecl());
1563
1564   if (D->isCanonicalDecl()) {
1565     // When reading, we'll add it to the folding set of the following template.
1566     Record.AddDeclRef(D->getSpecializedTemplate()->getCanonicalDecl());
1567   }
1568
1569   Code = serialization::DECL_VAR_TEMPLATE_SPECIALIZATION;
1570 }
1571
1572 void ASTDeclWriter::VisitVarTemplatePartialSpecializationDecl(
1573     VarTemplatePartialSpecializationDecl *D) {
1574   VisitVarTemplateSpecializationDecl(D);
1575
1576   Record.AddTemplateParameterList(D->getTemplateParameters());
1577   Record.AddASTTemplateArgumentListInfo(D->getTemplateArgsAsWritten());
1578
1579   // These are read/set from/to the first declaration.
1580   if (D->getPreviousDecl() == nullptr) {
1581     Record.AddDeclRef(D->getInstantiatedFromMember());
1582     Record.push_back(D->isMemberSpecialization());
1583   }
1584
1585   Code = serialization::DECL_VAR_TEMPLATE_PARTIAL_SPECIALIZATION;
1586 }
1587
1588 void ASTDeclWriter::VisitClassScopeFunctionSpecializationDecl(
1589                                     ClassScopeFunctionSpecializationDecl *D) {
1590   VisitDecl(D);
1591   Record.AddDeclRef(D->getSpecialization());
1592   Record.push_back(D->hasExplicitTemplateArgs());
1593   if (D->hasExplicitTemplateArgs())
1594     Record.AddASTTemplateArgumentListInfo(D->getTemplateArgsAsWritten());
1595   Code = serialization::DECL_CLASS_SCOPE_FUNCTION_SPECIALIZATION;
1596 }
1597
1598
1599 void ASTDeclWriter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1600   VisitRedeclarableTemplateDecl(D);
1601
1602   if (D->isFirstDecl())
1603     AddTemplateSpecializations(D);
1604   Code = serialization::DECL_FUNCTION_TEMPLATE;
1605 }
1606
1607 void ASTDeclWriter::VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D) {
1608   VisitTypeDecl(D);
1609
1610   Record.push_back(D->wasDeclaredWithTypename());
1611   // TODO: Concepts - constrained parameters.
1612   bool OwnsDefaultArg = D->hasDefaultArgument() &&
1613                         !D->defaultArgumentWasInherited();
1614   Record.push_back(OwnsDefaultArg);
1615   if (OwnsDefaultArg)
1616     Record.AddTypeSourceInfo(D->getDefaultArgumentInfo());
1617
1618   Code = serialization::DECL_TEMPLATE_TYPE_PARM;
1619 }
1620
1621 void ASTDeclWriter::VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {
1622   // For an expanded parameter pack, record the number of expansion types here
1623   // so that it's easier for deserialization to allocate the right amount of
1624   // memory.
1625   if (D->isExpandedParameterPack())
1626     Record.push_back(D->getNumExpansionTypes());
1627
1628   VisitDeclaratorDecl(D);
1629   // TemplateParmPosition.
1630   Record.push_back(D->getDepth());
1631   Record.push_back(D->getPosition());
1632
1633   if (D->isExpandedParameterPack()) {
1634     for (unsigned I = 0, N = D->getNumExpansionTypes(); I != N; ++I) {
1635       Record.AddTypeRef(D->getExpansionType(I));
1636       Record.AddTypeSourceInfo(D->getExpansionTypeSourceInfo(I));
1637     }
1638
1639     Code = serialization::DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK;
1640   } else {
1641     // TODO: Concepts - constrained parameters.
1642     // Rest of NonTypeTemplateParmDecl.
1643     Record.push_back(D->isParameterPack());
1644     bool OwnsDefaultArg = D->hasDefaultArgument() &&
1645                           !D->defaultArgumentWasInherited();
1646     Record.push_back(OwnsDefaultArg);
1647     if (OwnsDefaultArg)
1648       Record.AddStmt(D->getDefaultArgument());
1649     Code = serialization::DECL_NON_TYPE_TEMPLATE_PARM;
1650   }
1651 }
1652
1653 void ASTDeclWriter::VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D) {
1654   // For an expanded parameter pack, record the number of expansion types here
1655   // so that it's easier for deserialization to allocate the right amount of
1656   // memory.
1657   if (D->isExpandedParameterPack())
1658     Record.push_back(D->getNumExpansionTemplateParameters());
1659
1660   VisitTemplateDecl(D);
1661   // TemplateParmPosition.
1662   Record.push_back(D->getDepth());
1663   Record.push_back(D->getPosition());
1664
1665   if (D->isExpandedParameterPack()) {
1666     for (unsigned I = 0, N = D->getNumExpansionTemplateParameters();
1667          I != N; ++I)
1668       Record.AddTemplateParameterList(D->getExpansionTemplateParameters(I));
1669     Code = serialization::DECL_EXPANDED_TEMPLATE_TEMPLATE_PARM_PACK;
1670   } else {
1671     // TODO: Concepts - constrained parameters.
1672     // Rest of TemplateTemplateParmDecl.
1673     Record.push_back(D->isParameterPack());
1674     bool OwnsDefaultArg = D->hasDefaultArgument() &&
1675                           !D->defaultArgumentWasInherited();
1676     Record.push_back(OwnsDefaultArg);
1677     if (OwnsDefaultArg)
1678       Record.AddTemplateArgumentLoc(D->getDefaultArgument());
1679     Code = serialization::DECL_TEMPLATE_TEMPLATE_PARM;
1680   }
1681 }
1682
1683 void ASTDeclWriter::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) {
1684   VisitRedeclarableTemplateDecl(D);
1685   Code = serialization::DECL_TYPE_ALIAS_TEMPLATE;
1686 }
1687
1688 void ASTDeclWriter::VisitStaticAssertDecl(StaticAssertDecl *D) {
1689   VisitDecl(D);
1690   Record.AddStmt(D->getAssertExpr());
1691   Record.push_back(D->isFailed());
1692   Record.AddStmt(D->getMessage());
1693   Record.AddSourceLocation(D->getRParenLoc());
1694   Code = serialization::DECL_STATIC_ASSERT;
1695 }
1696
1697 /// Emit the DeclContext part of a declaration context decl.
1698 void ASTDeclWriter::VisitDeclContext(DeclContext *DC) {
1699   Record.AddOffset(Writer.WriteDeclContextLexicalBlock(Context, DC));
1700   Record.AddOffset(Writer.WriteDeclContextVisibleBlock(Context, DC));
1701 }
1702
1703 const Decl *ASTWriter::getFirstLocalDecl(const Decl *D) {
1704   assert(IsLocalDecl(D) && "expected a local declaration");
1705
1706   const Decl *Canon = D->getCanonicalDecl();
1707   if (IsLocalDecl(Canon))
1708     return Canon;
1709
1710   const Decl *&CacheEntry = FirstLocalDeclCache[Canon];
1711   if (CacheEntry)
1712     return CacheEntry;
1713
1714   for (const Decl *Redecl = D; Redecl; Redecl = Redecl->getPreviousDecl())
1715     if (IsLocalDecl(Redecl))
1716       D = Redecl;
1717   return CacheEntry = D;
1718 }
1719
1720 template <typename T>
1721 void ASTDeclWriter::VisitRedeclarable(Redeclarable<T> *D) {
1722   T *First = D->getFirstDecl();
1723   T *MostRecent = First->getMostRecentDecl();
1724   T *DAsT = static_cast<T *>(D);
1725   if (MostRecent != First) {
1726     assert(isRedeclarableDeclKind(DAsT->getKind()) &&
1727            "Not considered redeclarable?");
1728
1729     Record.AddDeclRef(First);
1730
1731     // Write out a list of local redeclarations of this declaration if it's the
1732     // first local declaration in the chain.
1733     const Decl *FirstLocal = Writer.getFirstLocalDecl(DAsT);
1734     if (DAsT == FirstLocal) {
1735       // Emit a list of all imported first declarations so that we can be sure
1736       // that all redeclarations visible to this module are before D in the
1737       // redecl chain.
1738       unsigned I = Record.size();
1739       Record.push_back(0);
1740       if (Writer.Chain)
1741         AddFirstDeclFromEachModule(DAsT, /*IncludeLocal*/false);
1742       // This is the number of imported first declarations + 1.
1743       Record[I] = Record.size() - I;
1744
1745       // Collect the set of local redeclarations of this declaration, from
1746       // newest to oldest.
1747       ASTWriter::RecordData LocalRedecls;
1748       ASTRecordWriter LocalRedeclWriter(Record, LocalRedecls);
1749       for (const Decl *Prev = FirstLocal->getMostRecentDecl();
1750            Prev != FirstLocal; Prev = Prev->getPreviousDecl())
1751         if (!Prev->isFromASTFile())
1752           LocalRedeclWriter.AddDeclRef(Prev);
1753
1754       // If we have any redecls, write them now as a separate record preceding
1755       // the declaration itself.
1756       if (LocalRedecls.empty())
1757         Record.push_back(0);
1758       else
1759         Record.AddOffset(LocalRedeclWriter.Emit(LOCAL_REDECLARATIONS));
1760     } else {
1761       Record.push_back(0);
1762       Record.AddDeclRef(FirstLocal);
1763     }
1764
1765     // Make sure that we serialize both the previous and the most-recent
1766     // declarations, which (transitively) ensures that all declarations in the
1767     // chain get serialized.
1768     //
1769     // FIXME: This is not correct; when we reach an imported declaration we
1770     // won't emit its previous declaration.
1771     (void)Writer.GetDeclRef(D->getPreviousDecl());
1772     (void)Writer.GetDeclRef(MostRecent);
1773   } else {
1774     // We use the sentinel value 0 to indicate an only declaration.
1775     Record.push_back(0);
1776   }
1777 }
1778
1779 void ASTDeclWriter::VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D) {
1780   Record.push_back(D->varlist_size());
1781   VisitDecl(D);
1782   for (auto *I : D->varlists())
1783     Record.AddStmt(I);
1784   Code = serialization::DECL_OMP_THREADPRIVATE;
1785 }
1786
1787 void ASTDeclWriter::VisitOMPAllocateDecl(OMPAllocateDecl *D) {
1788   Record.push_back(D->varlist_size());
1789   Record.push_back(D->clauselist_size());
1790   VisitDecl(D);
1791   for (auto *I : D->varlists())
1792     Record.AddStmt(I);
1793   OMPClauseWriter ClauseWriter(Record);
1794   for (OMPClause *C : D->clauselists())
1795     ClauseWriter.writeClause(C);
1796   Code = serialization::DECL_OMP_ALLOCATE;
1797 }
1798
1799 void ASTDeclWriter::VisitOMPRequiresDecl(OMPRequiresDecl *D) {
1800   Record.push_back(D->clauselist_size());
1801   VisitDecl(D);
1802   OMPClauseWriter ClauseWriter(Record);
1803   for (OMPClause *C : D->clauselists())
1804     ClauseWriter.writeClause(C);
1805   Code = serialization::DECL_OMP_REQUIRES;
1806 }
1807
1808 void ASTDeclWriter::VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D) {
1809   VisitValueDecl(D);
1810   Record.AddSourceLocation(D->getBeginLoc());
1811   Record.AddStmt(D->getCombinerIn());
1812   Record.AddStmt(D->getCombinerOut());
1813   Record.AddStmt(D->getCombiner());
1814   Record.AddStmt(D->getInitOrig());
1815   Record.AddStmt(D->getInitPriv());
1816   Record.AddStmt(D->getInitializer());
1817   Record.push_back(D->getInitializerKind());
1818   Record.AddDeclRef(D->getPrevDeclInScope());
1819   Code = serialization::DECL_OMP_DECLARE_REDUCTION;
1820 }
1821
1822 void ASTDeclWriter::VisitOMPDeclareMapperDecl(OMPDeclareMapperDecl *D) {
1823   Record.push_back(D->clauselist_size());
1824   VisitValueDecl(D);
1825   Record.AddSourceLocation(D->getBeginLoc());
1826   Record.AddStmt(D->getMapperVarRef());
1827   Record.AddDeclarationName(D->getVarName());
1828   Record.AddDeclRef(D->getPrevDeclInScope());
1829   OMPClauseWriter ClauseWriter(Record);
1830   for (OMPClause *C : D->clauselists())
1831     ClauseWriter.writeClause(C);
1832   Code = serialization::DECL_OMP_DECLARE_MAPPER;
1833 }
1834
1835 void ASTDeclWriter::VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D) {
1836   VisitVarDecl(D);
1837   Code = serialization::DECL_OMP_CAPTUREDEXPR;
1838 }
1839
1840 //===----------------------------------------------------------------------===//
1841 // ASTWriter Implementation
1842 //===----------------------------------------------------------------------===//
1843
1844 void ASTWriter::WriteDeclAbbrevs() {
1845   using namespace llvm;
1846
1847   std::shared_ptr<BitCodeAbbrev> Abv;
1848
1849   // Abbreviation for DECL_FIELD
1850   Abv = std::make_shared<BitCodeAbbrev>();
1851   Abv->Add(BitCodeAbbrevOp(serialization::DECL_FIELD));
1852   // Decl
1853   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1854   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1855   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1856   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1857   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1858   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1859   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1860   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1861   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1862   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1863   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1864   // NamedDecl
1865   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1866   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1867   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1868   // ValueDecl
1869   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1870   // DeclaratorDecl
1871   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1872   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1873   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TSIType
1874   // FieldDecl
1875   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1876   Abv->Add(BitCodeAbbrevOp(0));                       // InitStyle
1877   // Type Source Info
1878   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1879   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1880   DeclFieldAbbrev = Stream.EmitAbbrev(std::move(Abv));
1881
1882   // Abbreviation for DECL_OBJC_IVAR
1883   Abv = std::make_shared<BitCodeAbbrev>();
1884   Abv->Add(BitCodeAbbrevOp(serialization::DECL_OBJC_IVAR));
1885   // Decl
1886   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1887   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1888   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1889   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1890   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1891   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1892   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1893   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1894   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1895   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1896   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1897   // NamedDecl
1898   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1899   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1900   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1901   // ValueDecl
1902   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1903   // DeclaratorDecl
1904   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1905   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1906   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TSIType
1907   // FieldDecl
1908   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1909   Abv->Add(BitCodeAbbrevOp(0));                       // InitStyle
1910   // ObjC Ivar
1911   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getAccessControl
1912   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getSynthesize
1913   // Type Source Info
1914   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1915   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1916   DeclObjCIvarAbbrev = Stream.EmitAbbrev(std::move(Abv));
1917
1918   // Abbreviation for DECL_ENUM
1919   Abv = std::make_shared<BitCodeAbbrev>();
1920   Abv->Add(BitCodeAbbrevOp(serialization::DECL_ENUM));
1921   // Redeclarable
1922   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1923   // Decl
1924   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1925   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1926   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1927   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1928   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1929   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1930   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1931   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1932   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1933   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1934   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1935   // NamedDecl
1936   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1937   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1938   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1939   // TypeDecl
1940   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1941   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1942   // TagDecl
1943   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1944   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1945   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1946   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1947   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1948   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsCompleteDefinitionRequired
1949   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1950   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1951   Abv->Add(BitCodeAbbrevOp(0));                         // ExtInfoKind
1952   // EnumDecl
1953   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // AddTypeRef
1954   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IntegerType
1955   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getPromotionType
1956   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumPositiveBits
1957   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumNegativeBits
1958   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScoped
1959   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScopedUsingClassTag
1960   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isFixed
1961   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));// ODRHash
1962   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // InstantiatedMembEnum
1963   // DC
1964   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1965   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1966   DeclEnumAbbrev = Stream.EmitAbbrev(std::move(Abv));
1967
1968   // Abbreviation for DECL_RECORD
1969   Abv = std::make_shared<BitCodeAbbrev>();
1970   Abv->Add(BitCodeAbbrevOp(serialization::DECL_RECORD));
1971   // Redeclarable
1972   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1973   // Decl
1974   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1975   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1976   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1977   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1978   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1979   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1980   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1981   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1982   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1983   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1984   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1985   // NamedDecl
1986   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1987   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1988   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1989   // TypeDecl
1990   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1991   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1992   // TagDecl
1993   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1994   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1995   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1996   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1997   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1998   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsCompleteDefinitionRequired
1999   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
2000   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
2001   Abv->Add(BitCodeAbbrevOp(0));                         // ExtInfoKind
2002   // RecordDecl
2003   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // FlexibleArrayMember
2004   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // AnonymousStructUnion
2005   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasObjectMember
2006   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasVolatileMember
2007
2008   // isNonTrivialToPrimitiveDefaultInitialize
2009   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
2010   // isNonTrivialToPrimitiveCopy
2011   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
2012   // isNonTrivialToPrimitiveDestroy
2013   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
2014   // hasNonTrivialToPrimitiveDefaultInitializeCUnion
2015   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
2016   // hasNonTrivialToPrimitiveDestructCUnion
2017   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
2018   // hasNonTrivialToPrimitiveCopyCUnion
2019   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
2020   // isParamDestroyedInCallee
2021   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
2022   // getArgPassingRestrictions
2023   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));
2024
2025   // DC
2026   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
2027   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
2028   DeclRecordAbbrev = Stream.EmitAbbrev(std::move(Abv));
2029
2030   // Abbreviation for DECL_PARM_VAR
2031   Abv = std::make_shared<BitCodeAbbrev>();
2032   Abv->Add(BitCodeAbbrevOp(serialization::DECL_PARM_VAR));
2033   // Redeclarable
2034   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
2035   // Decl
2036   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
2037   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
2038   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
2039   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
2040   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
2041   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
2042   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
2043   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
2044   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
2045   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
2046   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
2047   // NamedDecl
2048   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
2049   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
2050   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
2051   // ValueDecl
2052   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2053   // DeclaratorDecl
2054   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
2055   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
2056   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TSIType
2057   // VarDecl
2058   Abv->Add(BitCodeAbbrevOp(0));                       // SClass
2059   Abv->Add(BitCodeAbbrevOp(0));                       // TSCSpec
2060   Abv->Add(BitCodeAbbrevOp(0));                       // InitStyle
2061   Abv->Add(BitCodeAbbrevOp(0));                       // ARCPseudoStrong
2062   Abv->Add(BitCodeAbbrevOp(0));                       // Linkage
2063   Abv->Add(BitCodeAbbrevOp(0));                       // HasInit
2064   Abv->Add(BitCodeAbbrevOp(0));                   // HasMemberSpecializationInfo
2065   // ParmVarDecl
2066   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsObjCMethodParameter
2067   Abv->Add(BitCodeAbbrevOp(0));                       // ScopeDepth
2068   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ScopeIndex
2069   Abv->Add(BitCodeAbbrevOp(0));                       // ObjCDeclQualifier
2070   Abv->Add(BitCodeAbbrevOp(0));                       // KNRPromoted
2071   Abv->Add(BitCodeAbbrevOp(0));                       // HasInheritedDefaultArg
2072   Abv->Add(BitCodeAbbrevOp(0));                   // HasUninstantiatedDefaultArg
2073   // Type Source Info
2074   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2075   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
2076   DeclParmVarAbbrev = Stream.EmitAbbrev(std::move(Abv));
2077
2078   // Abbreviation for DECL_TYPEDEF
2079   Abv = std::make_shared<BitCodeAbbrev>();
2080   Abv->Add(BitCodeAbbrevOp(serialization::DECL_TYPEDEF));
2081   // Redeclarable
2082   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
2083   // Decl
2084   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
2085   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
2086   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
2087   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
2088   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
2089   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isUsed
2090   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isReferenced
2091   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
2092   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // C++ AccessSpecifier
2093   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
2094   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
2095   // NamedDecl
2096   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
2097   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
2098   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
2099   // TypeDecl
2100   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
2101   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
2102   // TypedefDecl
2103   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2104   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
2105   DeclTypedefAbbrev = Stream.EmitAbbrev(std::move(Abv));
2106
2107   // Abbreviation for DECL_VAR
2108   Abv = std::make_shared<BitCodeAbbrev>();
2109   Abv->Add(BitCodeAbbrevOp(serialization::DECL_VAR));
2110   // Redeclarable
2111   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
2112   // Decl
2113   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
2114   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
2115   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
2116   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
2117   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
2118   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
2119   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
2120   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
2121   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
2122   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
2123   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
2124   // NamedDecl
2125   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
2126   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
2127   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
2128   // ValueDecl
2129   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2130   // DeclaratorDecl
2131   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
2132   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
2133   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TSIType
2134   // VarDecl
2135   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // SClass
2136   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // TSCSpec
2137   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // InitStyle
2138   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isARCPseudoStrong
2139   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsThisDeclarationADemotedDefinition
2140   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isExceptionVariable
2141   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isNRVOVariable
2142   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCXXForRangeDecl
2143   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isObjCForDecl
2144   Abv->Add(BitCodeAbbrevOp(0));                         // isInline
2145   Abv->Add(BitCodeAbbrevOp(0));                         // isInlineSpecified
2146   Abv->Add(BitCodeAbbrevOp(0));                         // isConstexpr
2147   Abv->Add(BitCodeAbbrevOp(0));                         // isInitCapture
2148   Abv->Add(BitCodeAbbrevOp(0));                         // isPrevDeclInSameScope
2149   Abv->Add(BitCodeAbbrevOp(0));                         // ImplicitParamKind
2150   Abv->Add(BitCodeAbbrevOp(0));                         // EscapingByref
2151   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Linkage
2152   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // IsInitICE (local)
2153   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // VarKind (local enum)
2154   // Type Source Info
2155   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2156   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
2157   DeclVarAbbrev = Stream.EmitAbbrev(std::move(Abv));
2158
2159   // Abbreviation for DECL_CXX_METHOD
2160   Abv = std::make_shared<BitCodeAbbrev>();
2161   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CXX_METHOD));
2162   // RedeclarableDecl
2163   Abv->Add(BitCodeAbbrevOp(0));                         // CanonicalDecl
2164   // Decl
2165   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // DeclContext
2166   Abv->Add(BitCodeAbbrevOp(0));                         // LexicalDeclContext
2167   Abv->Add(BitCodeAbbrevOp(0));                         // Invalid
2168   Abv->Add(BitCodeAbbrevOp(0));                         // HasAttrs
2169   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Implicit
2170   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Used
2171   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Referenced
2172   Abv->Add(BitCodeAbbrevOp(0));                         // InObjCContainer
2173   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // Access
2174   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ModulePrivate
2175   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SubmoduleID
2176   // NamedDecl
2177   Abv->Add(BitCodeAbbrevOp(DeclarationName::Identifier)); // NameKind
2178   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // Identifier
2179   Abv->Add(BitCodeAbbrevOp(0));                         // AnonDeclNumber
2180   // ValueDecl
2181   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // Type
2182   // DeclaratorDecl
2183   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // InnerLocStart
2184   Abv->Add(BitCodeAbbrevOp(0));                         // HasExtInfo
2185   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // TSIType
2186   // FunctionDecl
2187   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 11)); // IDNS
2188   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // StorageClass
2189   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Inline
2190   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InlineSpecified
2191   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // VirtualAsWritten
2192   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Pure
2193   Abv->Add(BitCodeAbbrevOp(0));                         // HasInheritedProto
2194   Abv->Add(BitCodeAbbrevOp(1));                         // HasWrittenProto
2195   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Deleted
2196   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Trivial
2197   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // TrivialForCall
2198   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Defaulted
2199   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ExplicitlyDefaulted
2200   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ImplicitReturnZero
2201   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constexpr
2202   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // UsesSEHTry
2203   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // SkippedBody
2204   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // MultiVersion
2205   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // LateParsed
2206   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Linkage
2207   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LocEnd
2208   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // ODRHash
2209   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // TemplateKind
2210   // This Array slurps the rest of the record. Fortunately we want to encode
2211   // (nearly) all the remaining (variable number of) fields in the same way.
2212   //
2213   // This is the function template information if any, then
2214   //         NumParams and Params[] from FunctionDecl, and
2215   //         NumOverriddenMethods, OverriddenMethods[] from CXXMethodDecl.
2216   //
2217   //  Add an AbbrevOp for 'size then elements' and use it here.
2218   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2219   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
2220   DeclCXXMethodAbbrev = Stream.EmitAbbrev(std::move(Abv));
2221
2222   // Abbreviation for EXPR_DECL_REF
2223   Abv = std::make_shared<BitCodeAbbrev>();
2224   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_DECL_REF));
2225   //Stmt
2226   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsOMPStructuredBlock
2227   // Expr
2228   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2229   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2230   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2231   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2232   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2233   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2234   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2235   //DeclRefExpr
2236   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HasQualifier
2237   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //GetDeclFound
2238   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ExplicitTemplateArgs
2239   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HadMultipleCandidates
2240   Abv->Add(BitCodeAbbrevOp(0)); // RefersToEnclosingVariableOrCapture
2241   Abv->Add(BitCodeAbbrevOp(0)); // NonOdrUseReason
2242   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclRef
2243   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
2244   DeclRefExprAbbrev = Stream.EmitAbbrev(std::move(Abv));
2245
2246   // Abbreviation for EXPR_INTEGER_LITERAL
2247   Abv = std::make_shared<BitCodeAbbrev>();
2248   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_INTEGER_LITERAL));
2249   //Stmt
2250   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsOMPStructuredBlock
2251   // Expr
2252   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2253   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2254   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2255   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2256   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2257   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2258   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2259   //Integer Literal
2260   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
2261   Abv->Add(BitCodeAbbrevOp(32));                      // Bit Width
2262   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Value
2263   IntegerLiteralAbbrev = Stream.EmitAbbrev(std::move(Abv));
2264
2265   // Abbreviation for EXPR_CHARACTER_LITERAL
2266   Abv = std::make_shared<BitCodeAbbrev>();
2267   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_CHARACTER_LITERAL));
2268   //Stmt
2269   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsOMPStructuredBlock
2270   // Expr
2271   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2272   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2273   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2274   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2275   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2276   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2277   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2278   //Character Literal
2279   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getValue
2280   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
2281   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // getKind
2282   CharacterLiteralAbbrev = Stream.EmitAbbrev(std::move(Abv));
2283
2284   // Abbreviation for EXPR_IMPLICIT_CAST
2285   Abv = std::make_shared<BitCodeAbbrev>();
2286   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_IMPLICIT_CAST));
2287   // Stmt
2288   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsOMPStructuredBlock
2289   // Expr
2290   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2291   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2292   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2293   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2294   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2295   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2296   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2297   // CastExpr
2298   Abv->Add(BitCodeAbbrevOp(0)); // PathSize
2299   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 6)); // CastKind
2300   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // PartOfExplicitCast
2301   // ImplicitCastExpr
2302   ExprImplicitCastAbbrev = Stream.EmitAbbrev(std::move(Abv));
2303
2304   Abv = std::make_shared<BitCodeAbbrev>();
2305   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_LEXICAL));
2306   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2307   DeclContextLexicalAbbrev = Stream.EmitAbbrev(std::move(Abv));
2308
2309   Abv = std::make_shared<BitCodeAbbrev>();
2310   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_VISIBLE));
2311   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2312   DeclContextVisibleLookupAbbrev = Stream.EmitAbbrev(std::move(Abv));
2313 }
2314
2315 /// isRequiredDecl - Check if this is a "required" Decl, which must be seen by
2316 /// consumers of the AST.
2317 ///
2318 /// Such decls will always be deserialized from the AST file, so we would like
2319 /// this to be as restrictive as possible. Currently the predicate is driven by
2320 /// code generation requirements, if other clients have a different notion of
2321 /// what is "required" then we may have to consider an alternate scheme where
2322 /// clients can iterate over the top-level decls and get information on them,
2323 /// without necessary deserializing them. We could explicitly require such
2324 /// clients to use a separate API call to "realize" the decl. This should be
2325 /// relatively painless since they would presumably only do it for top-level
2326 /// decls.
2327 static bool isRequiredDecl(const Decl *D, ASTContext &Context,
2328                            bool WritingModule) {
2329   // An ObjCMethodDecl is never considered as "required" because its
2330   // implementation container always is.
2331
2332   // File scoped assembly or obj-c or OMP declare target implementation must be
2333   // seen.
2334   if (isa<FileScopeAsmDecl>(D) || isa<ObjCImplDecl>(D))
2335     return true;
2336
2337   if (WritingModule && isPartOfPerModuleInitializer(D)) {
2338     // These declarations are part of the module initializer, and are emitted
2339     // if and when the module is imported, rather than being emitted eagerly.
2340     return false;
2341   }
2342
2343   return Context.DeclMustBeEmitted(D);
2344 }
2345
2346 void ASTWriter::WriteDecl(ASTContext &Context, Decl *D) {
2347   PrettyDeclStackTraceEntry CrashInfo(Context, D, SourceLocation(),
2348                                       "serializing");
2349
2350   // Determine the ID for this declaration.
2351   serialization::DeclID ID;
2352   assert(!D->isFromASTFile() && "should not be emitting imported decl");
2353   serialization::DeclID &IDR = DeclIDs[D];
2354   if (IDR == 0)
2355     IDR = NextDeclID++;
2356
2357   ID = IDR;
2358
2359   assert(ID >= FirstDeclID && "invalid decl ID");
2360
2361   RecordData Record;
2362   ASTDeclWriter W(*this, Context, Record);
2363
2364   // Build a record for this declaration
2365   W.Visit(D);
2366
2367   // Emit this declaration to the bitstream.
2368   uint64_t Offset = W.Emit(D);
2369
2370   // Record the offset for this declaration
2371   SourceLocation Loc = D->getLocation();
2372   unsigned Index = ID - FirstDeclID;
2373   if (DeclOffsets.size() == Index)
2374     DeclOffsets.push_back(DeclOffset(Loc, Offset));
2375   else if (DeclOffsets.size() < Index) {
2376     // FIXME: Can/should this happen?
2377     DeclOffsets.resize(Index+1);
2378     DeclOffsets[Index].setLocation(Loc);
2379     DeclOffsets[Index].BitOffset = Offset;
2380   } else {
2381     llvm_unreachable("declarations should be emitted in ID order");
2382   }
2383
2384   SourceManager &SM = Context.getSourceManager();
2385   if (Loc.isValid() && SM.isLocalSourceLocation(Loc))
2386     associateDeclWithFile(D, ID);
2387
2388   // Note declarations that should be deserialized eagerly so that we can add
2389   // them to a record in the AST file later.
2390   if (isRequiredDecl(D, Context, WritingModule))
2391     EagerlyDeserializedDecls.push_back(ID);
2392 }
2393
2394 void ASTRecordWriter::AddFunctionDefinition(const FunctionDecl *FD) {
2395   // Switch case IDs are per function body.
2396   Writer->ClearSwitchCaseIDs();
2397
2398   assert(FD->doesThisDeclarationHaveABody());
2399   bool ModulesCodegen = false;
2400   if (Writer->WritingModule && !FD->isDependentContext()) {
2401     Optional<GVALinkage> Linkage;
2402     if (Writer->WritingModule->Kind == Module::ModuleInterfaceUnit) {
2403       // When building a C++ Modules TS module interface unit, a strong
2404       // definition in the module interface is provided by the compilation of
2405       // that module interface unit, not by its users. (Inline functions are
2406       // still emitted in module users.)
2407       Linkage = Writer->Context->GetGVALinkageForFunction(FD);
2408       ModulesCodegen = *Linkage == GVA_StrongExternal;
2409     }
2410     if (Writer->Context->getLangOpts().ModulesCodegen) {
2411       // Under -fmodules-codegen, codegen is performed for all non-internal,
2412       // non-always_inline functions.
2413       if (!FD->hasAttr<AlwaysInlineAttr>()) {
2414         if (!Linkage)
2415           Linkage = Writer->Context->GetGVALinkageForFunction(FD);
2416         ModulesCodegen = *Linkage != GVA_Internal;
2417       }
2418     }
2419   }
2420   Record->push_back(ModulesCodegen);
2421   if (ModulesCodegen)
2422     Writer->ModularCodegenDecls.push_back(Writer->GetDeclRef(FD));
2423   if (auto *CD = dyn_cast<CXXConstructorDecl>(FD)) {
2424     Record->push_back(CD->getNumCtorInitializers());
2425     if (CD->getNumCtorInitializers())
2426       AddCXXCtorInitializers(
2427           llvm::makeArrayRef(CD->init_begin(), CD->init_end()));
2428   }
2429   AddStmt(FD->getBody());
2430 }