/build/source/llvm/include/llvm/Bitstream/BitstreamWriter.h

Bug Summary

File:	build/source/llvm/include/llvm/Bitstream/BitstreamWriter.h
Warning:	line 493, column 9 1st function call argument is an uninitialized value
Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name ASTWriter.cpp -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -relaxed-aliasing -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/source/build-llvm -resource-dir /usr/lib/llvm-16/lib/clang/16 -I tools/clang/lib/Serialization -I /build/source/clang/lib/Serialization -I /build/source/clang/include -I tools/clang/include -I include -I /build/source/llvm/include -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -D _FORTIFY_SOURCE=2 -D NDEBUG -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/backward -internal-isystem /usr/lib/llvm-16/lib/clang/16/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fmacro-prefix-map=/build/source/build-llvm=build-llvm -fmacro-prefix-map=/build/source/= -fcoverage-prefix-map=/build/source/build-llvm=build-llvm -fcoverage-prefix-map=/build/source/= -source-date-epoch 1672917203 -O3 -Wno-unused-command-line-argument -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wno-comment -Wno-misleading-indentation -std=c++17 -fdeprecated-macro -fdebug-compilation-dir=/build/source/build-llvm -fdebug-prefix-map=/build/source/build-llvm=build-llvm -fdebug-prefix-map=/build/source/= -fdebug-prefix-map=/build/source/build-llvm=build-llvm -fdebug-prefix-map=/build/source/= -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fcolor-diagnostics -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2023-01-05-142129-16235-1 -x c++ /build/source/clang/lib/Serialization/ASTWriter.cpp
/build/source/clang/lib/Serialization/ASTWriter.cpp

→
1//===- ASTWriter.cpp - AST File Writer ------------------------------------===//
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 defines the ASTWriter class, which writes AST files.
10//
11//===----------------------------------------------------------------------===//

13#include "ASTCommon.h"
14#include "ASTReaderInternals.h"
15#include "MultiOnDiskHashTable.h"
16#include "clang/AST/ASTContext.h"
17#include "clang/AST/ASTUnresolvedSet.h"
18#include "clang/AST/AbstractTypeWriter.h"
19#include "clang/AST/Attr.h"
20#include "clang/AST/Decl.h"
21#include "clang/AST/DeclBase.h"
22#include "clang/AST/DeclCXX.h"
23#include "clang/AST/DeclContextInternals.h"
24#include "clang/AST/DeclFriend.h"
25#include "clang/AST/DeclObjC.h"
26#include "clang/AST/DeclTemplate.h"
27#include "clang/AST/DeclarationName.h"
28#include "clang/AST/Expr.h"
29#include "clang/AST/ExprCXX.h"
30#include "clang/AST/LambdaCapture.h"
31#include "clang/AST/NestedNameSpecifier.h"
32#include "clang/AST/OpenMPClause.h"
33#include "clang/AST/RawCommentList.h"
34#include "clang/AST/TemplateName.h"
35#include "clang/AST/Type.h"
36#include "clang/AST/TypeLocVisitor.h"
37#include "clang/Basic/Diagnostic.h"
38#include "clang/Basic/DiagnosticOptions.h"
39#include "clang/Basic/FileManager.h"
40#include "clang/Basic/FileSystemOptions.h"
41#include "clang/Basic/IdentifierTable.h"
42#include "clang/Basic/LLVM.h"
43#include "clang/Basic/Lambda.h"
44#include "clang/Basic/LangOptions.h"
45#include "clang/Basic/Module.h"
46#include "clang/Basic/ObjCRuntime.h"
47#include "clang/Basic/OpenCLOptions.h"
48#include "clang/Basic/SourceLocation.h"
49#include "clang/Basic/SourceManager.h"
50#include "clang/Basic/SourceManagerInternals.h"
51#include "clang/Basic/Specifiers.h"
52#include "clang/Basic/TargetInfo.h"
53#include "clang/Basic/TargetOptions.h"
54#include "clang/Basic/Version.h"
55#include "clang/Lex/HeaderSearch.h"
56#include "clang/Lex/HeaderSearchOptions.h"
57#include "clang/Lex/MacroInfo.h"
58#include "clang/Lex/ModuleMap.h"
59#include "clang/Lex/PreprocessingRecord.h"
60#include "clang/Lex/Preprocessor.h"
61#include "clang/Lex/PreprocessorOptions.h"
62#include "clang/Lex/Token.h"
63#include "clang/Sema/IdentifierResolver.h"
64#include "clang/Sema/ObjCMethodList.h"
65#include "clang/Sema/Sema.h"
66#include "clang/Sema/Weak.h"
67#include "clang/Serialization/ASTBitCodes.h"
68#include "clang/Serialization/ASTReader.h"
69#include "clang/Serialization/ASTRecordWriter.h"
70#include "clang/Serialization/InMemoryModuleCache.h"
71#include "clang/Serialization/ModuleFile.h"
72#include "clang/Serialization/ModuleFileExtension.h"
73#include "clang/Serialization/SerializationDiagnostic.h"
74#include "llvm/ADT/APFloat.h"
75#include "llvm/ADT/APInt.h"
76#include "llvm/ADT/APSInt.h"
77#include "llvm/ADT/ArrayRef.h"
78#include "llvm/ADT/DenseMap.h"
79#include "llvm/ADT/Hashing.h"
80#include "llvm/ADT/Optional.h"
81#include "llvm/ADT/PointerIntPair.h"
82#include "llvm/ADT/STLExtras.h"
83#include "llvm/ADT/ScopeExit.h"
84#include "llvm/ADT/SmallPtrSet.h"
85#include "llvm/ADT/SmallString.h"
86#include "llvm/ADT/SmallVector.h"
87#include "llvm/ADT/StringMap.h"
88#include "llvm/ADT/StringRef.h"
89#include "llvm/Bitstream/BitCodes.h"
90#include "llvm/Bitstream/BitstreamWriter.h"
91#include "llvm/Support/Casting.h"
92#include "llvm/Support/Compression.h"
93#include "llvm/Support/DJB.h"
94#include "llvm/Support/Endian.h"
95#include "llvm/Support/EndianStream.h"
96#include "llvm/Support/Error.h"
97#include "llvm/Support/ErrorHandling.h"
98#include "llvm/Support/LEB128.h"
99#include "llvm/Support/MemoryBuffer.h"
100#include "llvm/Support/OnDiskHashTable.h"
101#include "llvm/Support/Path.h"
102#include "llvm/Support/SHA1.h"
103#include "llvm/Support/TimeProfiler.h"
104#include "llvm/Support/VersionTuple.h"
105#include "llvm/Support/raw_ostream.h"
106#include <algorithm>
107#include <cassert>
108#include <cstdint>
109#include <cstdlib>
110#include <cstring>
111#include <ctime>
112#include <limits>
113#include <memory>
114#include <queue>
115#include <tuple>
116#include <utility>
117#include <vector>

119using namespace clang;
120using namespace clang::serialization;

122template <typename T, typename Allocator>
123static StringRef bytes(const std::vector<T, Allocator> &v) {
if (v.empty()) return StringRef();
return StringRef(reinterpret_cast<const char*>(&v[0]),
                       sizeof(T) * v.size());
127}

129template <typename T>
130static StringRef bytes(const SmallVectorImpl<T> &v) {
return StringRef(reinterpret_cast<const char*>(v.data()),
                       sizeof(T) * v.size());
133}

135static std::string bytes(const std::vector<bool> &V) {
std::string Str;
Str.reserve(V.size() / 8);
for (unsigned I = 0, E = V.size(); I < E;) {
  char Byte = 0;
  for (unsigned Bit = 0; Bit < 8 && I < E; ++Bit, ++I)
    Byte |= V[I] << Bit;
  Str += Byte;
}
return Str;
145}

147//===----------------------------------------------------------------------===//
148// Type serialization
149//===----------------------------------------------------------------------===//

151static TypeCode getTypeCodeForTypeClass(Type::TypeClass id) {
switch (id) {
153#define TYPE_BIT_CODE(CLASS_ID, CODE_ID, CODE_VALUE) \
case Type::CLASS_ID: return TYPE_##CODE_ID;
155#include "clang/Serialization/TypeBitCodes.def"
case Type::Builtin:
  llvm_unreachable("shouldn't be serializing a builtin type this way")::llvm::llvm_unreachable_internal("shouldn't be serializing a builtin type this way"
, "clang/lib/Serialization/ASTWriter.cpp", 157);
}
llvm_unreachable("bad type kind")::llvm::llvm_unreachable_internal("bad type kind", "clang/lib/Serialization/ASTWriter.cpp"
, 159);
160}

162namespace {

164std::set<const FileEntry *> GetAffectingModuleMaps(const Preprocessor &PP,
                                                 Module *RootModule) {
std::set<const FileEntry *> ModuleMaps{};
std::set<const Module *> ProcessedModules;
SmallVector<const Module *> ModulesToProcess{RootModule};

const HeaderSearch &HS = PP.getHeaderSearchInfo();

SmallVector<const FileEntry *, 16> FilesByUID;
HS.getFileMgr().GetUniqueIDMapping(FilesByUID);

if (FilesByUID.size() > HS.header_file_size())
  FilesByUID.resize(HS.header_file_size());

for (unsigned UID = 0, LastUID = FilesByUID.size(); UID != LastUID; ++UID) {
  const FileEntry *File = FilesByUID[UID];
  if (!File)
    continue;

  const HeaderFileInfo *HFI =
      HS.getExistingFileInfo(File, /*WantExternal*/ false);
  if (!HFI || (HFI->isModuleHeader && !HFI->isCompilingModuleHeader))
    continue;

  for (const auto &KH : HS.findAllModulesForHeader(File)) {
    if (!KH.getModule())
      continue;
    ModulesToProcess.push_back(KH.getModule());
  }
}

const ModuleMap &MM = HS.getModuleMap();
SourceManager &SourceMgr = PP.getSourceManager();

auto ForIncludeChain = [&](FileEntryRef F,
                           llvm::function_ref<void(FileEntryRef)> CB) {
  CB(F);
  FileID FID = SourceMgr.translateFile(F);
  SourceLocation Loc = SourceMgr.getIncludeLoc(FID);
  while (Loc.isValid()) {
    FID = SourceMgr.getFileID(Loc);
    CB(*SourceMgr.getFileEntryRefForID(FID));
    Loc = SourceMgr.getIncludeLoc(FID);
  }
};

auto ProcessModuleOnce = [&](const Module *M) {
  for (const Module *Mod = M; Mod; Mod = Mod->Parent)
    if (ProcessedModules.insert(Mod).second)
      if (auto ModuleMapFile = MM.getModuleMapFileForUniquing(Mod))
        ForIncludeChain(*ModuleMapFile, [&](FileEntryRef F) {
          ModuleMaps.insert(F);
        });
};

for (const Module *CurrentModule : ModulesToProcess) {
  ProcessModuleOnce(CurrentModule);
  for (const Module *ImportedModule : CurrentModule->Imports)
    ProcessModuleOnce(ImportedModule);
  for (const Module *UndeclaredModule : CurrentModule->UndeclaredUses)
    ProcessModuleOnce(UndeclaredModule);
}

return ModuleMaps;
228}

230class ASTTypeWriter {
ASTWriter &Writer;
ASTWriter::RecordData Record;
ASTRecordWriter BasicWriter;

235public:
ASTTypeWriter(ASTWriter &Writer)
  : Writer(Writer), BasicWriter(Writer, Record) {}

uint64_t write(QualType T) {
  if (T.hasLocalNonFastQualifiers()) {
    Qualifiers Qs = T.getLocalQualifiers();
    BasicWriter.writeQualType(T.getLocalUnqualifiedType());
    BasicWriter.writeQualifiers(Qs);
    return BasicWriter.Emit(TYPE_EXT_QUAL, Writer.getTypeExtQualAbbrev());
  }

  const Type *typePtr = T.getTypePtr();
  serialization::AbstractTypeWriter<ASTRecordWriter> atw(BasicWriter);
  atw.write(typePtr);
  return BasicWriter.Emit(getTypeCodeForTypeClass(typePtr->getTypeClass()),
                          /*abbrev*/ 0);
}
253};

255class TypeLocWriter : public TypeLocVisitor<TypeLocWriter> {
using LocSeq = SourceLocationSequence;

ASTRecordWriter &Record;
LocSeq *Seq;

void addSourceLocation(SourceLocation Loc) {
  Record.AddSourceLocation(Loc, Seq);
}
void addSourceRange(SourceRange Range) { Record.AddSourceRange(Range, Seq); }

266public:
TypeLocWriter(ASTRecordWriter &Record, LocSeq *Seq)
    : Record(Record), Seq(Seq) {}

270#define ABSTRACT_TYPELOC(CLASS, PARENT)
271#define TYPELOC(CLASS, PARENT) \
  void Visit##CLASS##TypeLoc(CLASS##TypeLoc TyLoc);
273#include "clang/AST/TypeLocNodes.def"

void VisitArrayTypeLoc(ArrayTypeLoc TyLoc);
void VisitFunctionTypeLoc(FunctionTypeLoc TyLoc);
277};

279} // namespace

281void TypeLocWriter::VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
// nothing to do
283}

285void TypeLocWriter::VisitBuiltinTypeLoc(BuiltinTypeLoc TL) {
addSourceLocation(TL.getBuiltinLoc());
if (TL.needsExtraLocalData()) {
  Record.push_back(TL.getWrittenTypeSpec());
  Record.push_back(static_cast<uint64_t>(TL.getWrittenSignSpec()));
  Record.push_back(static_cast<uint64_t>(TL.getWrittenWidthSpec()));
  Record.push_back(TL.hasModeAttr());
}
293}

295void TypeLocWriter::VisitComplexTypeLoc(ComplexTypeLoc TL) {
addSourceLocation(TL.getNameLoc());
297}

299void TypeLocWriter::VisitPointerTypeLoc(PointerTypeLoc TL) {
addSourceLocation(TL.getStarLoc());
301}

303void TypeLocWriter::VisitDecayedTypeLoc(DecayedTypeLoc TL) {
// nothing to do
305}

307void TypeLocWriter::VisitAdjustedTypeLoc(AdjustedTypeLoc TL) {
// nothing to do
309}

311void TypeLocWriter::VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) {
addSourceLocation(TL.getCaretLoc());
313}

315void TypeLocWriter::VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) {
addSourceLocation(TL.getAmpLoc());
317}

319void TypeLocWriter::VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) {
addSourceLocation(TL.getAmpAmpLoc());
321}

323void TypeLocWriter::VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) {
addSourceLocation(TL.getStarLoc());
Record.AddTypeSourceInfo(TL.getClassTInfo());
326}

328void TypeLocWriter::VisitArrayTypeLoc(ArrayTypeLoc TL) {
addSourceLocation(TL.getLBracketLoc());
addSourceLocation(TL.getRBracketLoc());
Record.push_back(TL.getSizeExpr() ? 1 : 0);
if (TL.getSizeExpr())
  Record.AddStmt(TL.getSizeExpr());
334}

336void TypeLocWriter::VisitConstantArrayTypeLoc(ConstantArrayTypeLoc TL) {
VisitArrayTypeLoc(TL);
338}

340void TypeLocWriter::VisitIncompleteArrayTypeLoc(IncompleteArrayTypeLoc TL) {
VisitArrayTypeLoc(TL);
342}

344void TypeLocWriter::VisitVariableArrayTypeLoc(VariableArrayTypeLoc TL) {
VisitArrayTypeLoc(TL);
346}

348void TypeLocWriter::VisitDependentSizedArrayTypeLoc(
                                          DependentSizedArrayTypeLoc TL) {
VisitArrayTypeLoc(TL);
351}

353void TypeLocWriter::VisitDependentAddressSpaceTypeLoc(
  DependentAddressSpaceTypeLoc TL) {
addSourceLocation(TL.getAttrNameLoc());
SourceRange range = TL.getAttrOperandParensRange();
addSourceLocation(range.getBegin());
addSourceLocation(range.getEnd());
Record.AddStmt(TL.getAttrExprOperand());
360}

362void TypeLocWriter::VisitDependentSizedExtVectorTypeLoc(
                                      DependentSizedExtVectorTypeLoc TL) {
addSourceLocation(TL.getNameLoc());
365}

367void TypeLocWriter::VisitVectorTypeLoc(VectorTypeLoc TL) {
addSourceLocation(TL.getNameLoc());
369}

371void TypeLocWriter::VisitDependentVectorTypeLoc(
  DependentVectorTypeLoc TL) {
addSourceLocation(TL.getNameLoc());
374}

376void TypeLocWriter::VisitExtVectorTypeLoc(ExtVectorTypeLoc TL) {
addSourceLocation(TL.getNameLoc());
378}

380void TypeLocWriter::VisitConstantMatrixTypeLoc(ConstantMatrixTypeLoc TL) {
addSourceLocation(TL.getAttrNameLoc());
SourceRange range = TL.getAttrOperandParensRange();
addSourceLocation(range.getBegin());
addSourceLocation(range.getEnd());
Record.AddStmt(TL.getAttrRowOperand());
Record.AddStmt(TL.getAttrColumnOperand());
387}

389void TypeLocWriter::VisitDependentSizedMatrixTypeLoc(
  DependentSizedMatrixTypeLoc TL) {
addSourceLocation(TL.getAttrNameLoc());
SourceRange range = TL.getAttrOperandParensRange();
addSourceLocation(range.getBegin());
addSourceLocation(range.getEnd());
Record.AddStmt(TL.getAttrRowOperand());
Record.AddStmt(TL.getAttrColumnOperand());
397}

399void TypeLocWriter::VisitFunctionTypeLoc(FunctionTypeLoc TL) {
addSourceLocation(TL.getLocalRangeBegin());
addSourceLocation(TL.getLParenLoc());
addSourceLocation(TL.getRParenLoc());
addSourceRange(TL.getExceptionSpecRange());
addSourceLocation(TL.getLocalRangeEnd());
for (unsigned i = 0, e = TL.getNumParams(); i != e; ++i)
  Record.AddDeclRef(TL.getParam(i));
407}

409void TypeLocWriter::VisitFunctionProtoTypeLoc(FunctionProtoTypeLoc TL) {
VisitFunctionTypeLoc(TL);
411}

413void TypeLocWriter::VisitFunctionNoProtoTypeLoc(FunctionNoProtoTypeLoc TL) {
VisitFunctionTypeLoc(TL);
415}

417void TypeLocWriter::VisitUnresolvedUsingTypeLoc(UnresolvedUsingTypeLoc TL) {
addSourceLocation(TL.getNameLoc());
419}

421void TypeLocWriter::VisitUsingTypeLoc(UsingTypeLoc TL) {
addSourceLocation(TL.getNameLoc());
423}

425void TypeLocWriter::VisitTypedefTypeLoc(TypedefTypeLoc TL) {
addSourceLocation(TL.getNameLoc());
427}

429void TypeLocWriter::VisitObjCTypeParamTypeLoc(ObjCTypeParamTypeLoc TL) {
if (TL.getNumProtocols()) {
  addSourceLocation(TL.getProtocolLAngleLoc());
  addSourceLocation(TL.getProtocolRAngleLoc());
}
for (unsigned i = 0, e = TL.getNumProtocols(); i != e; ++i)
  addSourceLocation(TL.getProtocolLoc(i));
436}

438void TypeLocWriter::VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) {
addSourceLocation(TL.getTypeofLoc());
addSourceLocation(TL.getLParenLoc());
addSourceLocation(TL.getRParenLoc());
442}

444void TypeLocWriter::VisitTypeOfTypeLoc(TypeOfTypeLoc TL) {
addSourceLocation(TL.getTypeofLoc());
addSourceLocation(TL.getLParenLoc());
addSourceLocation(TL.getRParenLoc());
Record.AddTypeSourceInfo(TL.getUnmodifiedTInfo());
449}

451void TypeLocWriter::VisitDecltypeTypeLoc(DecltypeTypeLoc TL) {
addSourceLocation(TL.getDecltypeLoc());
addSourceLocation(TL.getRParenLoc());
454}

456void TypeLocWriter::VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) {
addSourceLocation(TL.getKWLoc());
addSourceLocation(TL.getLParenLoc());
addSourceLocation(TL.getRParenLoc());
Record.AddTypeSourceInfo(TL.getUnderlyingTInfo());
461}

463void TypeLocWriter::VisitAutoTypeLoc(AutoTypeLoc TL) {
addSourceLocation(TL.getNameLoc());
Record.push_back(TL.isConstrained());
if (TL.isConstrained()) {
  Record.AddNestedNameSpecifierLoc(TL.getNestedNameSpecifierLoc());
  addSourceLocation(TL.getTemplateKWLoc());
  addSourceLocation(TL.getConceptNameLoc());
  Record.AddDeclRef(TL.getFoundDecl());
  addSourceLocation(TL.getLAngleLoc());
  addSourceLocation(TL.getRAngleLoc());
  for (unsigned I = 0; I < TL.getNumArgs(); ++I)
    Record.AddTemplateArgumentLocInfo(
        TL.getTypePtr()->getTypeConstraintArguments()[I].getKind(),
        TL.getArgLocInfo(I));
}
Record.push_back(TL.isDecltypeAuto());
if (TL.isDecltypeAuto())
  addSourceLocation(TL.getRParenLoc());
481}

483void TypeLocWriter::VisitDeducedTemplateSpecializationTypeLoc(
  DeducedTemplateSpecializationTypeLoc TL) {
addSourceLocation(TL.getTemplateNameLoc());
486}

488void TypeLocWriter::VisitRecordTypeLoc(RecordTypeLoc TL) {
addSourceLocation(TL.getNameLoc());
490}

492void TypeLocWriter::VisitEnumTypeLoc(EnumTypeLoc TL) {
addSourceLocation(TL.getNameLoc());
494}

496void TypeLocWriter::VisitAttributedTypeLoc(AttributedTypeLoc TL) {
Record.AddAttr(TL.getAttr());
498}

500void TypeLocWriter::VisitBTFTagAttributedTypeLoc(BTFTagAttributedTypeLoc TL) {
// Nothing to do.
502}

504void TypeLocWriter::VisitTemplateTypeParmTypeLoc(TemplateTypeParmTypeLoc TL) {
addSourceLocation(TL.getNameLoc());
506}

508void TypeLocWriter::VisitSubstTemplateTypeParmTypeLoc(
                                          SubstTemplateTypeParmTypeLoc TL) {
addSourceLocation(TL.getNameLoc());
511}

513void TypeLocWriter::VisitSubstTemplateTypeParmPackTypeLoc(
                                        SubstTemplateTypeParmPackTypeLoc TL) {
addSourceLocation(TL.getNameLoc());
516}

518void TypeLocWriter::VisitTemplateSpecializationTypeLoc(
                                         TemplateSpecializationTypeLoc TL) {
addSourceLocation(TL.getTemplateKeywordLoc());
addSourceLocation(TL.getTemplateNameLoc());
addSourceLocation(TL.getLAngleLoc());
addSourceLocation(TL.getRAngleLoc());
for (unsigned i = 0, e = TL.getNumArgs(); i != e; ++i)
  Record.AddTemplateArgumentLocInfo(TL.getArgLoc(i).getArgument().getKind(),
                                    TL.getArgLoc(i).getLocInfo());
527}

529void TypeLocWriter::VisitParenTypeLoc(ParenTypeLoc TL) {
addSourceLocation(TL.getLParenLoc());
addSourceLocation(TL.getRParenLoc());
532}

534void TypeLocWriter::VisitMacroQualifiedTypeLoc(MacroQualifiedTypeLoc TL) {
addSourceLocation(TL.getExpansionLoc());
536}

538void TypeLocWriter::VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) {
addSourceLocation(TL.getElaboratedKeywordLoc());
Record.AddNestedNameSpecifierLoc(TL.getQualifierLoc());
541}

543void TypeLocWriter::VisitInjectedClassNameTypeLoc(InjectedClassNameTypeLoc TL) {
addSourceLocation(TL.getNameLoc());
545}

547void TypeLocWriter::VisitDependentNameTypeLoc(DependentNameTypeLoc TL) {
addSourceLocation(TL.getElaboratedKeywordLoc());
Record.AddNestedNameSpecifierLoc(TL.getQualifierLoc());
addSourceLocation(TL.getNameLoc());
551}

553void TypeLocWriter::VisitDependentTemplateSpecializationTypeLoc(
     DependentTemplateSpecializationTypeLoc TL) {
addSourceLocation(TL.getElaboratedKeywordLoc());
Record.AddNestedNameSpecifierLoc(TL.getQualifierLoc());
addSourceLocation(TL.getTemplateKeywordLoc());
addSourceLocation(TL.getTemplateNameLoc());
addSourceLocation(TL.getLAngleLoc());
addSourceLocation(TL.getRAngleLoc());
for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I)
  Record.AddTemplateArgumentLocInfo(TL.getArgLoc(I).getArgument().getKind(),
                                    TL.getArgLoc(I).getLocInfo());
564}

566void TypeLocWriter::VisitPackExpansionTypeLoc(PackExpansionTypeLoc TL) {
addSourceLocation(TL.getEllipsisLoc());
568}

570void TypeLocWriter::VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) {
addSourceLocation(TL.getNameLoc());
572}

574void TypeLocWriter::VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) {
Record.push_back(TL.hasBaseTypeAsWritten());
addSourceLocation(TL.getTypeArgsLAngleLoc());
addSourceLocation(TL.getTypeArgsRAngleLoc());
for (unsigned i = 0, e = TL.getNumTypeArgs(); i != e; ++i)
  Record.AddTypeSourceInfo(TL.getTypeArgTInfo(i));
addSourceLocation(TL.getProtocolLAngleLoc());
addSourceLocation(TL.getProtocolRAngleLoc());
for (unsigned i = 0, e = TL.getNumProtocols(); i != e; ++i)
  addSourceLocation(TL.getProtocolLoc(i));
584}

586void TypeLocWriter::VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
addSourceLocation(TL.getStarLoc());
588}

590void TypeLocWriter::VisitAtomicTypeLoc(AtomicTypeLoc TL) {
addSourceLocation(TL.getKWLoc());
addSourceLocation(TL.getLParenLoc());
addSourceLocation(TL.getRParenLoc());
594}

596void TypeLocWriter::VisitPipeTypeLoc(PipeTypeLoc TL) {
addSourceLocation(TL.getKWLoc());
598}

600void TypeLocWriter::VisitBitIntTypeLoc(clang::BitIntTypeLoc TL) {
addSourceLocation(TL.getNameLoc());
602}
603void TypeLocWriter::VisitDependentBitIntTypeLoc(
  clang::DependentBitIntTypeLoc TL) {
addSourceLocation(TL.getNameLoc());
606}

608void ASTWriter::WriteTypeAbbrevs() {
using namespace llvm;

std::shared_ptr<BitCodeAbbrev> Abv;

// Abbreviation for TYPE_EXT_QUAL
Abv = std::make_shared<BitCodeAbbrev>();
Abv->Add(BitCodeAbbrevOp(serialization::TYPE_EXT_QUAL));
Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // Type
Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 3));   // Quals
TypeExtQualAbbrev = Stream.EmitAbbrev(std::move(Abv));
619}

621//===----------------------------------------------------------------------===//
622// ASTWriter Implementation
623//===----------------------------------------------------------------------===//

625static void EmitBlockID(unsigned ID, const char *Name,
                      llvm::BitstreamWriter &Stream,
                      ASTWriter::RecordDataImpl &Record) {
Record.clear();
Record.push_back(ID);
Stream.EmitRecord(llvm::bitc::BLOCKINFO_CODE_SETBID, Record);

// Emit the block name if present.
if (!Name || Name[0] == 0)
  return;
Record.clear();
while (*Name)
  Record.push_back(*Name++);
Stream.EmitRecord(llvm::bitc::BLOCKINFO_CODE_BLOCKNAME, Record);
639}

641static void EmitRecordID(unsigned ID, const char *Name,
                       llvm::BitstreamWriter &Stream,
                       ASTWriter::RecordDataImpl &Record) {
Record.clear();
Record.push_back(ID);
while (*Name)
  Record.push_back(*Name++);
Stream.EmitRecord(llvm::bitc::BLOCKINFO_CODE_SETRECORDNAME, Record);
649}

651static void AddStmtsExprs(llvm::BitstreamWriter &Stream,
                        ASTWriter::RecordDataImpl &Record) {
653#define RECORD(X) EmitRecordID(X, #X, Stream, Record)
RECORD(STMT_STOP);
RECORD(STMT_NULL_PTR);
RECORD(STMT_REF_PTR);
RECORD(STMT_NULL);
RECORD(STMT_COMPOUND);
RECORD(STMT_CASE);
RECORD(STMT_DEFAULT);
RECORD(STMT_LABEL);
RECORD(STMT_ATTRIBUTED);
RECORD(STMT_IF);
RECORD(STMT_SWITCH);
RECORD(STMT_WHILE);
RECORD(STMT_DO);
RECORD(STMT_FOR);
RECORD(STMT_GOTO);
RECORD(STMT_INDIRECT_GOTO);
RECORD(STMT_CONTINUE);
RECORD(STMT_BREAK);
RECORD(STMT_RETURN);
RECORD(STMT_DECL);
RECORD(STMT_GCCASM);
RECORD(STMT_MSASM);
RECORD(EXPR_PREDEFINED);
RECORD(EXPR_DECL_REF);
RECORD(EXPR_INTEGER_LITERAL);
RECORD(EXPR_FIXEDPOINT_LITERAL);
RECORD(EXPR_FLOATING_LITERAL);
RECORD(EXPR_IMAGINARY_LITERAL);
RECORD(EXPR_STRING_LITERAL);
RECORD(EXPR_CHARACTER_LITERAL);
RECORD(EXPR_PAREN);
RECORD(EXPR_PAREN_LIST);
RECORD(EXPR_UNARY_OPERATOR);
RECORD(EXPR_SIZEOF_ALIGN_OF);
RECORD(EXPR_ARRAY_SUBSCRIPT);
RECORD(EXPR_CALL);
RECORD(EXPR_MEMBER);
RECORD(EXPR_BINARY_OPERATOR);
RECORD(EXPR_COMPOUND_ASSIGN_OPERATOR);
RECORD(EXPR_CONDITIONAL_OPERATOR);
RECORD(EXPR_IMPLICIT_CAST);
RECORD(EXPR_CSTYLE_CAST);
RECORD(EXPR_COMPOUND_LITERAL);
RECORD(EXPR_EXT_VECTOR_ELEMENT);
RECORD(EXPR_INIT_LIST);
RECORD(EXPR_DESIGNATED_INIT);
RECORD(EXPR_DESIGNATED_INIT_UPDATE);
RECORD(EXPR_IMPLICIT_VALUE_INIT);
RECORD(EXPR_NO_INIT);
RECORD(EXPR_VA_ARG);
RECORD(EXPR_ADDR_LABEL);
RECORD(EXPR_STMT);
RECORD(EXPR_CHOOSE);
RECORD(EXPR_GNU_NULL);
RECORD(EXPR_SHUFFLE_VECTOR);
RECORD(EXPR_BLOCK);
RECORD(EXPR_GENERIC_SELECTION);
RECORD(EXPR_OBJC_STRING_LITERAL);
RECORD(EXPR_OBJC_BOXED_EXPRESSION);
RECORD(EXPR_OBJC_ARRAY_LITERAL);
RECORD(EXPR_OBJC_DICTIONARY_LITERAL);
RECORD(EXPR_OBJC_ENCODE);
RECORD(EXPR_OBJC_SELECTOR_EXPR);
RECORD(EXPR_OBJC_PROTOCOL_EXPR);
RECORD(EXPR_OBJC_IVAR_REF_EXPR);
RECORD(EXPR_OBJC_PROPERTY_REF_EXPR);
RECORD(EXPR_OBJC_KVC_REF_EXPR);
RECORD(EXPR_OBJC_MESSAGE_EXPR);
RECORD(STMT_OBJC_FOR_COLLECTION);
RECORD(STMT_OBJC_CATCH);
RECORD(STMT_OBJC_FINALLY);
RECORD(STMT_OBJC_AT_TRY);
RECORD(STMT_OBJC_AT_SYNCHRONIZED);
RECORD(STMT_OBJC_AT_THROW);
RECORD(EXPR_OBJC_BOOL_LITERAL);
RECORD(STMT_CXX_CATCH);
RECORD(STMT_CXX_TRY);
RECORD(STMT_CXX_FOR_RANGE);
RECORD(EXPR_CXX_OPERATOR_CALL);
RECORD(EXPR_CXX_MEMBER_CALL);
RECORD(EXPR_CXX_REWRITTEN_BINARY_OPERATOR);
RECORD(EXPR_CXX_CONSTRUCT);
RECORD(EXPR_CXX_TEMPORARY_OBJECT);
RECORD(EXPR_CXX_STATIC_CAST);
RECORD(EXPR_CXX_DYNAMIC_CAST);
RECORD(EXPR_CXX_REINTERPRET_CAST);
RECORD(EXPR_CXX_CONST_CAST);
RECORD(EXPR_CXX_ADDRSPACE_CAST);
RECORD(EXPR_CXX_FUNCTIONAL_CAST);
RECORD(EXPR_USER_DEFINED_LITERAL);
RECORD(EXPR_CXX_STD_INITIALIZER_LIST);
RECORD(EXPR_CXX_BOOL_LITERAL);
RECORD(EXPR_CXX_NULL_PTR_LITERAL);
RECORD(EXPR_CXX_TYPEID_EXPR);
RECORD(EXPR_CXX_TYPEID_TYPE);
RECORD(EXPR_CXX_THIS);
RECORD(EXPR_CXX_THROW);
RECORD(EXPR_CXX_DEFAULT_ARG);
RECORD(EXPR_CXX_DEFAULT_INIT);
RECORD(EXPR_CXX_BIND_TEMPORARY);
RECORD(EXPR_CXX_SCALAR_VALUE_INIT);
RECORD(EXPR_CXX_NEW);
RECORD(EXPR_CXX_DELETE);
RECORD(EXPR_CXX_PSEUDO_DESTRUCTOR);
RECORD(EXPR_EXPR_WITH_CLEANUPS);
RECORD(EXPR_CXX_DEPENDENT_SCOPE_MEMBER);
RECORD(EXPR_CXX_DEPENDENT_SCOPE_DECL_REF);
RECORD(EXPR_CXX_UNRESOLVED_CONSTRUCT);
RECORD(EXPR_CXX_UNRESOLVED_MEMBER);
RECORD(EXPR_CXX_UNRESOLVED_LOOKUP);
RECORD(EXPR_CXX_EXPRESSION_TRAIT);
RECORD(EXPR_CXX_NOEXCEPT);
RECORD(EXPR_OPAQUE_VALUE);
RECORD(EXPR_BINARY_CONDITIONAL_OPERATOR);
RECORD(EXPR_TYPE_TRAIT);
RECORD(EXPR_ARRAY_TYPE_TRAIT);
RECORD(EXPR_PACK_EXPANSION);
RECORD(EXPR_SIZEOF_PACK);
RECORD(EXPR_SUBST_NON_TYPE_TEMPLATE_PARM);
RECORD(EXPR_SUBST_NON_TYPE_TEMPLATE_PARM_PACK);
RECORD(EXPR_FUNCTION_PARM_PACK);
RECORD(EXPR_MATERIALIZE_TEMPORARY);
RECORD(EXPR_CUDA_KERNEL_CALL);
RECORD(EXPR_CXX_UUIDOF_EXPR);
RECORD(EXPR_CXX_UUIDOF_TYPE);
RECORD(EXPR_LAMBDA);
780#undef RECORD
781}

783void ASTWriter::WriteBlockInfoBlock() {
RecordData Record;
Stream.EnterBlockInfoBlock();

787#define BLOCK(X) EmitBlockID(X ## _ID, #X, Stream, Record)
788#define RECORD(X) EmitRecordID(X, #X, Stream, Record)

// Control Block.
BLOCK(CONTROL_BLOCK);
RECORD(METADATA);
RECORD(MODULE_NAME);
RECORD(MODULE_DIRECTORY);
RECORD(MODULE_MAP_FILE);
RECORD(IMPORTS);
RECORD(ORIGINAL_FILE);
RECORD(ORIGINAL_FILE_ID);
RECORD(INPUT_FILE_OFFSETS);

BLOCK(OPTIONS_BLOCK);
RECORD(LANGUAGE_OPTIONS);
RECORD(TARGET_OPTIONS);
RECORD(FILE_SYSTEM_OPTIONS);
RECORD(HEADER_SEARCH_OPTIONS);
RECORD(PREPROCESSOR_OPTIONS);

BLOCK(INPUT_FILES_BLOCK);
RECORD(INPUT_FILE);
RECORD(INPUT_FILE_HASH);

// AST Top-Level Block.
BLOCK(AST_BLOCK);
RECORD(TYPE_OFFSET);
RECORD(DECL_OFFSET);
RECORD(IDENTIFIER_OFFSET);
RECORD(IDENTIFIER_TABLE);
RECORD(EAGERLY_DESERIALIZED_DECLS);
RECORD(MODULAR_CODEGEN_DECLS);
RECORD(SPECIAL_TYPES);
RECORD(STATISTICS);
RECORD(TENTATIVE_DEFINITIONS);
RECORD(SELECTOR_OFFSETS);
RECORD(METHOD_POOL);
RECORD(PP_COUNTER_VALUE);
RECORD(SOURCE_LOCATION_OFFSETS);
RECORD(SOURCE_LOCATION_PRELOADS);
RECORD(EXT_VECTOR_DECLS);
RECORD(UNUSED_FILESCOPED_DECLS);
RECORD(PPD_ENTITIES_OFFSETS);
RECORD(VTABLE_USES);
RECORD(PPD_SKIPPED_RANGES);
RECORD(REFERENCED_SELECTOR_POOL);
RECORD(TU_UPDATE_LEXICAL);
RECORD(SEMA_DECL_REFS);
RECORD(WEAK_UNDECLARED_IDENTIFIERS);
RECORD(PENDING_IMPLICIT_INSTANTIATIONS);
RECORD(UPDATE_VISIBLE);
RECORD(DECL_UPDATE_OFFSETS);
RECORD(DECL_UPDATES);
RECORD(CUDA_SPECIAL_DECL_REFS);
RECORD(HEADER_SEARCH_TABLE);
RECORD(FP_PRAGMA_OPTIONS);
RECORD(OPENCL_EXTENSIONS);
RECORD(OPENCL_EXTENSION_TYPES);
RECORD(OPENCL_EXTENSION_DECLS);
RECORD(DELEGATING_CTORS);
RECORD(KNOWN_NAMESPACES);
RECORD(MODULE_OFFSET_MAP);
RECORD(SOURCE_MANAGER_LINE_TABLE);
RECORD(OBJC_CATEGORIES_MAP);
RECORD(FILE_SORTED_DECLS);
RECORD(IMPORTED_MODULES);
RECORD(OBJC_CATEGORIES);
RECORD(MACRO_OFFSET);
RECORD(INTERESTING_IDENTIFIERS);
RECORD(UNDEFINED_BUT_USED);
RECORD(LATE_PARSED_TEMPLATE);
RECORD(OPTIMIZE_PRAGMA_OPTIONS);
RECORD(MSSTRUCT_PRAGMA_OPTIONS);
RECORD(POINTERS_TO_MEMBERS_PRAGMA_OPTIONS);
RECORD(UNUSED_LOCAL_TYPEDEF_NAME_CANDIDATES);
RECORD(DELETE_EXPRS_TO_ANALYZE);
RECORD(CUDA_PRAGMA_FORCE_HOST_DEVICE_DEPTH);
RECORD(PP_CONDITIONAL_STACK);
RECORD(DECLS_TO_CHECK_FOR_DEFERRED_DIAGS);
RECORD(PP_INCLUDED_FILES);
RECORD(PP_ASSUME_NONNULL_LOC);

// SourceManager Block.
BLOCK(SOURCE_MANAGER_BLOCK);
RECORD(SM_SLOC_FILE_ENTRY);
RECORD(SM_SLOC_BUFFER_ENTRY);
RECORD(SM_SLOC_BUFFER_BLOB);
RECORD(SM_SLOC_BUFFER_BLOB_COMPRESSED);
RECORD(SM_SLOC_EXPANSION_ENTRY);

// Preprocessor Block.
BLOCK(PREPROCESSOR_BLOCK);
RECORD(PP_MACRO_DIRECTIVE_HISTORY);
RECORD(PP_MACRO_FUNCTION_LIKE);
RECORD(PP_MACRO_OBJECT_LIKE);
RECORD(PP_MODULE_MACRO);
RECORD(PP_TOKEN);

// Submodule Block.
BLOCK(SUBMODULE_BLOCK);
RECORD(SUBMODULE_METADATA);
RECORD(SUBMODULE_DEFINITION);
RECORD(SUBMODULE_UMBRELLA_HEADER);
RECORD(SUBMODULE_HEADER);
RECORD(SUBMODULE_TOPHEADER);
RECORD(SUBMODULE_UMBRELLA_DIR);
RECORD(SUBMODULE_IMPORTS);
RECORD(SUBMODULE_AFFECTING_MODULES);
RECORD(SUBMODULE_EXPORTS);
RECORD(SUBMODULE_REQUIRES);
RECORD(SUBMODULE_EXCLUDED_HEADER);
RECORD(SUBMODULE_LINK_LIBRARY);
RECORD(SUBMODULE_CONFIG_MACRO);
RECORD(SUBMODULE_CONFLICT);
RECORD(SUBMODULE_PRIVATE_HEADER);
RECORD(SUBMODULE_TEXTUAL_HEADER);
RECORD(SUBMODULE_PRIVATE_TEXTUAL_HEADER);
RECORD(SUBMODULE_INITIALIZERS);
RECORD(SUBMODULE_EXPORT_AS);

// Comments Block.
BLOCK(COMMENTS_BLOCK);
RECORD(COMMENTS_RAW_COMMENT);

// Decls and Types block.
BLOCK(DECLTYPES_BLOCK);
RECORD(TYPE_EXT_QUAL);
RECORD(TYPE_COMPLEX);
RECORD(TYPE_POINTER);
RECORD(TYPE_BLOCK_POINTER);
RECORD(TYPE_LVALUE_REFERENCE);
RECORD(TYPE_RVALUE_REFERENCE);
RECORD(TYPE_MEMBER_POINTER);
RECORD(TYPE_CONSTANT_ARRAY);
RECORD(TYPE_INCOMPLETE_ARRAY);
RECORD(TYPE_VARIABLE_ARRAY);
RECORD(TYPE_VECTOR);
RECORD(TYPE_EXT_VECTOR);
RECORD(TYPE_FUNCTION_NO_PROTO);
RECORD(TYPE_FUNCTION_PROTO);
RECORD(TYPE_TYPEDEF);
RECORD(TYPE_TYPEOF_EXPR);
RECORD(TYPE_TYPEOF);
RECORD(TYPE_RECORD);
RECORD(TYPE_ENUM);
RECORD(TYPE_OBJC_INTERFACE);
RECORD(TYPE_OBJC_OBJECT_POINTER);
RECORD(TYPE_DECLTYPE);
RECORD(TYPE_ELABORATED);
RECORD(TYPE_SUBST_TEMPLATE_TYPE_PARM);
RECORD(TYPE_UNRESOLVED_USING);
RECORD(TYPE_INJECTED_CLASS_NAME);
RECORD(TYPE_OBJC_OBJECT);
RECORD(TYPE_TEMPLATE_TYPE_PARM);
RECORD(TYPE_TEMPLATE_SPECIALIZATION);
RECORD(TYPE_DEPENDENT_NAME);
RECORD(TYPE_DEPENDENT_TEMPLATE_SPECIALIZATION);
RECORD(TYPE_DEPENDENT_SIZED_ARRAY);
RECORD(TYPE_PAREN);
RECORD(TYPE_MACRO_QUALIFIED);
RECORD(TYPE_PACK_EXPANSION);
RECORD(TYPE_ATTRIBUTED);
RECORD(TYPE_SUBST_TEMPLATE_TYPE_PARM_PACK);
RECORD(TYPE_AUTO);
RECORD(TYPE_UNARY_TRANSFORM);
RECORD(TYPE_ATOMIC);
RECORD(TYPE_DECAYED);
RECORD(TYPE_ADJUSTED);
RECORD(TYPE_OBJC_TYPE_PARAM);
RECORD(LOCAL_REDECLARATIONS);
RECORD(DECL_TYPEDEF);
RECORD(DECL_TYPEALIAS);
RECORD(DECL_ENUM);
RECORD(DECL_RECORD);
RECORD(DECL_ENUM_CONSTANT);
RECORD(DECL_FUNCTION);
RECORD(DECL_OBJC_METHOD);
RECORD(DECL_OBJC_INTERFACE);
RECORD(DECL_OBJC_PROTOCOL);
RECORD(DECL_OBJC_IVAR);
RECORD(DECL_OBJC_AT_DEFS_FIELD);
RECORD(DECL_OBJC_CATEGORY);
RECORD(DECL_OBJC_CATEGORY_IMPL);
RECORD(DECL_OBJC_IMPLEMENTATION);
RECORD(DECL_OBJC_COMPATIBLE_ALIAS);
RECORD(DECL_OBJC_PROPERTY);
RECORD(DECL_OBJC_PROPERTY_IMPL);
RECORD(DECL_FIELD);
RECORD(DECL_MS_PROPERTY);
RECORD(DECL_VAR);
RECORD(DECL_IMPLICIT_PARAM);
RECORD(DECL_PARM_VAR);
RECORD(DECL_FILE_SCOPE_ASM);
RECORD(DECL_BLOCK);
RECORD(DECL_CONTEXT_LEXICAL);
RECORD(DECL_CONTEXT_VISIBLE);
RECORD(DECL_NAMESPACE);
RECORD(DECL_NAMESPACE_ALIAS);
RECORD(DECL_USING);
RECORD(DECL_USING_SHADOW);
RECORD(DECL_USING_DIRECTIVE);
RECORD(DECL_UNRESOLVED_USING_VALUE);
RECORD(DECL_UNRESOLVED_USING_TYPENAME);
RECORD(DECL_LINKAGE_SPEC);
RECORD(DECL_CXX_RECORD);
RECORD(DECL_CXX_METHOD);
RECORD(DECL_CXX_CONSTRUCTOR);
RECORD(DECL_CXX_DESTRUCTOR);
RECORD(DECL_CXX_CONVERSION);
RECORD(DECL_ACCESS_SPEC);
RECORD(DECL_FRIEND);
RECORD(DECL_FRIEND_TEMPLATE);
RECORD(DECL_CLASS_TEMPLATE);
RECORD(DECL_CLASS_TEMPLATE_SPECIALIZATION);
RECORD(DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION);
RECORD(DECL_VAR_TEMPLATE);
RECORD(DECL_VAR_TEMPLATE_SPECIALIZATION);
RECORD(DECL_VAR_TEMPLATE_PARTIAL_SPECIALIZATION);
RECORD(DECL_FUNCTION_TEMPLATE);
RECORD(DECL_TEMPLATE_TYPE_PARM);
RECORD(DECL_NON_TYPE_TEMPLATE_PARM);
RECORD(DECL_TEMPLATE_TEMPLATE_PARM);
RECORD(DECL_CONCEPT);
RECORD(DECL_REQUIRES_EXPR_BODY);
RECORD(DECL_TYPE_ALIAS_TEMPLATE);
RECORD(DECL_STATIC_ASSERT);
RECORD(DECL_CXX_BASE_SPECIFIERS);
RECORD(DECL_CXX_CTOR_INITIALIZERS);
RECORD(DECL_INDIRECTFIELD);
RECORD(DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK);
RECORD(DECL_EXPANDED_TEMPLATE_TEMPLATE_PARM_PACK);
RECORD(DECL_CLASS_SCOPE_FUNCTION_SPECIALIZATION);
RECORD(DECL_IMPORT);
RECORD(DECL_OMP_THREADPRIVATE);
RECORD(DECL_EMPTY);
RECORD(DECL_OBJC_TYPE_PARAM);
RECORD(DECL_OMP_CAPTUREDEXPR);
RECORD(DECL_PRAGMA_COMMENT);
RECORD(DECL_PRAGMA_DETECT_MISMATCH);
RECORD(DECL_OMP_DECLARE_REDUCTION);
RECORD(DECL_OMP_ALLOCATE);
RECORD(DECL_HLSL_BUFFER);

// Statements and Exprs can occur in the Decls and Types block.
AddStmtsExprs(Stream, Record);

BLOCK(PREPROCESSOR_DETAIL_BLOCK);
RECORD(PPD_MACRO_EXPANSION);
RECORD(PPD_MACRO_DEFINITION);
RECORD(PPD_INCLUSION_DIRECTIVE);

// Decls and Types block.
BLOCK(EXTENSION_BLOCK);
RECORD(EXTENSION_METADATA);

BLOCK(UNHASHED_CONTROL_BLOCK);
RECORD(SIGNATURE);
RECORD(AST_BLOCK_HASH);
RECORD(DIAGNOSTIC_OPTIONS);
RECORD(HEADER_SEARCH_PATHS);
RECORD(DIAG_PRAGMA_MAPPINGS);

1050#undef RECORD
1051#undef BLOCK
Stream.ExitBlock();
1053}

1055/// Prepares a path for being written to an AST file by converting it
1056/// to an absolute path and removing nested './'s.
1057///
1058/// \return \c true if the path was changed.
1059static bool cleanPathForOutput(FileManager &FileMgr,
                             SmallVectorImpl<char> &Path) {
bool Changed = FileMgr.makeAbsolutePath(Path);
return Changed | llvm::sys::path::remove_dots(Path);
1063}

1065/// Adjusts the given filename to only write out the portion of the
1066/// filename that is not part of the system root directory.
1067///
1068/// \param Filename the file name to adjust.
1069///
1070/// \param BaseDir When non-NULL, the PCH file is a relocatable AST file and
1071/// the returned filename will be adjusted by this root directory.
1072///
1073/// \returns either the original filename (if it needs no adjustment) or the
1074/// adjusted filename (which points into the @p Filename parameter).
1075static const char *
1076adjustFilenameForRelocatableAST(const char *Filename, StringRef BaseDir) {
assert(Filename && "No file name to adjust?")(static_cast <bool> (Filename && "No file name to adjust?"
) ? void (0) : __assert_fail ("Filename && \"No file name to adjust?\""
, "clang/lib/Serialization/ASTWriter.cpp", 1077, __extension__
 __PRETTY_FUNCTION__));

if (BaseDir.empty())
  return Filename;

// Verify that the filename and the system root have the same prefix.
unsigned Pos = 0;
for (; Filename[Pos] && Pos < BaseDir.size(); ++Pos)
  if (Filename[Pos] != BaseDir[Pos])
    return Filename; // Prefixes don't match.

// We hit the end of the filename before we hit the end of the system root.
if (!Filename[Pos])
  return Filename;

// If there's not a path separator at the end of the base directory nor
// immediately after it, then this isn't within the base directory.
if (!llvm::sys::path::is_separator(Filename[Pos])) {
  if (!llvm::sys::path::is_separator(BaseDir.back()))
    return Filename;
} else {
  // If the file name has a '/' at the current position, skip over the '/'.
  // We distinguish relative paths from absolute paths by the
  // absence of '/' at the beginning of relative paths.
  //
  // FIXME: This is wrong. We distinguish them by asking if the path is
  // absolute, which isn't the same thing. And there might be multiple '/'s
  // in a row. Use a better mechanism to indicate whether we have emitted an
  // absolute or relative path.
  ++Pos;
}

return Filename + Pos;
1110}

1112std::pair<ASTFileSignature, ASTFileSignature>
1113ASTWriter::createSignature(StringRef AllBytes, StringRef ASTBlockBytes) {
llvm::SHA1 Hasher;
Hasher.update(ASTBlockBytes);
ASTFileSignature ASTBlockHash = ASTFileSignature::create(Hasher.result());

// Add the remaining bytes (i.e. bytes before the unhashed control block that
// are not part of the AST block).
Hasher.update(
    AllBytes.take_front(ASTBlockBytes.bytes_end() - AllBytes.bytes_begin()));
Hasher.update(
    AllBytes.take_back(AllBytes.bytes_end() - ASTBlockBytes.bytes_end()));
ASTFileSignature Signature = ASTFileSignature::create(Hasher.result());

return std::make_pair(ASTBlockHash, Signature);
1127}

1129ASTFileSignature ASTWriter::writeUnhashedControlBlock(Preprocessor &PP,
                                                    ASTContext &Context) {
using namespace llvm;

// Flush first to prepare the PCM hash (signature).
Stream.FlushToWord();
auto StartOfUnhashedControl = Stream.GetCurrentBitNo() >> 3;

// Enter the block and prepare to write records.
RecordData Record;
Stream.EnterSubblock(UNHASHED_CONTROL_BLOCK_ID, 5);

// For implicit modules, write the hash of the PCM as its signature.
ASTFileSignature Signature;
if (WritingModule &&
    PP.getHeaderSearchInfo().getHeaderSearchOpts().ModulesHashContent) {
  ASTFileSignature ASTBlockHash;
  auto ASTBlockStartByte = ASTBlockRange.first >> 3;
  auto ASTBlockByteLength = (ASTBlockRange.second >> 3) - ASTBlockStartByte;
  std::tie(ASTBlockHash, Signature) = createSignature(
      StringRef(Buffer.begin(), StartOfUnhashedControl),
      StringRef(Buffer.begin() + ASTBlockStartByte, ASTBlockByteLength));

  Record.append(ASTBlockHash.begin(), ASTBlockHash.end());
  Stream.EmitRecord(AST_BLOCK_HASH, Record);
  Record.clear();
  Record.append(Signature.begin(), Signature.end());
  Stream.EmitRecord(SIGNATURE, Record);
  Record.clear();
}

// Diagnostic options.
const auto &Diags = Context.getDiagnostics();
const DiagnosticOptions &DiagOpts = Diags.getDiagnosticOptions();
1163#define DIAGOPT(Name, Bits, Default) Record.push_back(DiagOpts.Name);
1164#define ENUM_DIAGOPT(Name, Type, Bits, Default)                                \
Record.push_back(static_cast<unsigned>(DiagOpts.get##Name()));
1166#include "clang/Basic/DiagnosticOptions.def"
Record.push_back(DiagOpts.Warnings.size());
for (unsigned I = 0, N = DiagOpts.Warnings.size(); I != N; ++I)
  AddString(DiagOpts.Warnings[I], Record);
Record.push_back(DiagOpts.Remarks.size());
for (unsigned I = 0, N = DiagOpts.Remarks.size(); I != N; ++I)
  AddString(DiagOpts.Remarks[I], Record);
// Note: we don't serialize the log or serialization file names, because they
// are generally transient files and will almost always be overridden.
Stream.EmitRecord(DIAGNOSTIC_OPTIONS, Record);
Record.clear();

// Header search paths.
Record.clear();
const HeaderSearchOptions &HSOpts =
    PP.getHeaderSearchInfo().getHeaderSearchOpts();

// Include entries.
Record.push_back(HSOpts.UserEntries.size());
for (unsigned I = 0, N = HSOpts.UserEntries.size(); I != N; ++I) {
  const HeaderSearchOptions::Entry &Entry = HSOpts.UserEntries[I];
  AddString(Entry.Path, Record);
  Record.push_back(static_cast<unsigned>(Entry.Group));
  Record.push_back(Entry.IsFramework);
  Record.push_back(Entry.IgnoreSysRoot);
}

// System header prefixes.
Record.push_back(HSOpts.SystemHeaderPrefixes.size());
for (unsigned I = 0, N = HSOpts.SystemHeaderPrefixes.size(); I != N; ++I) {
  AddString(HSOpts.SystemHeaderPrefixes[I].Prefix, Record);
  Record.push_back(HSOpts.SystemHeaderPrefixes[I].IsSystemHeader);
}

// VFS overlay files.
Record.push_back(HSOpts.VFSOverlayFiles.size());
for (StringRef VFSOverlayFile : HSOpts.VFSOverlayFiles)
  AddString(VFSOverlayFile, Record);

Stream.EmitRecord(HEADER_SEARCH_PATHS, Record);

// Write out the diagnostic/pragma mappings.
WritePragmaDiagnosticMappings(Diags, /* isModule = */ WritingModule);

// Header search entry usage.
auto HSEntryUsage = PP.getHeaderSearchInfo().computeUserEntryUsage();
auto Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(HEADER_SEARCH_ENTRY_USAGE));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // Number of bits.
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));      // Bit vector.
unsigned HSUsageAbbrevCode = Stream.EmitAbbrev(std::move(Abbrev));
{
  RecordData::value_type Record[] = {HEADER_SEARCH_ENTRY_USAGE,
                                     HSEntryUsage.size()};
  Stream.EmitRecordWithBlob(HSUsageAbbrevCode, Record, bytes(HSEntryUsage));
}

// Leave the options block.
Stream.ExitBlock();
return Signature;
1226}

1228/// Write the control block.
1229void ASTWriter::WriteControlBlock(Preprocessor &PP, ASTContext &Context,
                                StringRef isysroot) {
using namespace llvm;

Stream.EnterSubblock(CONTROL_BLOCK_ID, 5);
RecordData Record;

// Metadata
auto MetadataAbbrev = std::make_shared<BitCodeAbbrev>();
MetadataAbbrev->Add(BitCodeAbbrevOp(METADATA));
MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // Major
MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // Minor
MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // Clang maj.
MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // Clang min.
MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Relocatable
MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Timestamps
MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Errors
MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // SVN branch/tag
unsigned MetadataAbbrevCode = Stream.EmitAbbrev(std::move(MetadataAbbrev));
assert((!WritingModule || isysroot.empty()) &&(static_cast <bool> ((!WritingModule || isysroot.empty(
)) && "writing module as a relocatable PCH?") ? void (
0) : __assert_fail ("(!WritingModule || isysroot.empty()) && \"writing module as a relocatable PCH?\""
, "clang/lib/Serialization/ASTWriter.cpp", 1249, __extension__
 __PRETTY_FUNCTION__))
       "writing module as a relocatable PCH?")(static_cast <bool> ((!WritingModule || isysroot.empty(
)) && "writing module as a relocatable PCH?") ? void (
0) : __assert_fail ("(!WritingModule || isysroot.empty()) && \"writing module as a relocatable PCH?\""
, "clang/lib/Serialization/ASTWriter.cpp", 1249, __extension__
 __PRETTY_FUNCTION__));
{
  RecordData::value_type Record[] = {
      METADATA,
      VERSION_MAJOR,
      VERSION_MINOR,
      CLANG_VERSION_MAJOR16,
      CLANG_VERSION_MINOR0,
      !isysroot.empty(),
      IncludeTimestamps,
      ASTHasCompilerErrors};
  Stream.EmitRecordWithBlob(MetadataAbbrevCode, Record,
                            getClangFullRepositoryVersion());
}

if (WritingModule) {
  // Module name
  auto Abbrev = std::make_shared<BitCodeAbbrev>();
  Abbrev->Add(BitCodeAbbrevOp(MODULE_NAME));
  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
  unsigned AbbrevCode = Stream.EmitAbbrev(std::move(Abbrev));
  RecordData::value_type Record[] = {MODULE_NAME};
  Stream.EmitRecordWithBlob(AbbrevCode, Record, WritingModule->Name);
}

if (WritingModule && WritingModule->Directory) {
  SmallString<128> BaseDir;
  if (PP.getHeaderSearchInfo().getHeaderSearchOpts().ModuleFileHomeIsCwd) {
    // Use the current working directory as the base path for all inputs.
    auto *CWD =
        Context.getSourceManager().getFileManager().getDirectory(".").get();
    BaseDir.assign(CWD->getName());
  } else {
    BaseDir.assign(WritingModule->Directory->getName());
  }
  cleanPathForOutput(Context.getSourceManager().getFileManager(), BaseDir);

  // If the home of the module is the current working directory, then we
  // want to pick up the cwd of the build process loading the module, not
  // our cwd, when we load this module.
  if (!(PP.getHeaderSearchInfo()
            .getHeaderSearchOpts()
            .ModuleMapFileHomeIsCwd ||
        PP.getHeaderSearchInfo().getHeaderSearchOpts().ModuleFileHomeIsCwd) ||
      WritingModule->Directory->getName() != StringRef(".")) {
    // Module directory.
    auto Abbrev = std::make_shared<BitCodeAbbrev>();
    Abbrev->Add(BitCodeAbbrevOp(MODULE_DIRECTORY));
    Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Directory
    unsigned AbbrevCode = Stream.EmitAbbrev(std::move(Abbrev));

    RecordData::value_type Record[] = {MODULE_DIRECTORY};
    Stream.EmitRecordWithBlob(AbbrevCode, Record, BaseDir);
  }

  // Write out all other paths relative to the base directory if possible.
  BaseDirectory.assign(BaseDir.begin(), BaseDir.end());
} else if (!isysroot.empty()) {
  // Write out paths relative to the sysroot if possible.
  BaseDirectory = std::string(isysroot);
}

// Module map file
if (WritingModule && WritingModule->Kind == Module::ModuleMapModule) {
  Record.clear();

  auto &Map = PP.getHeaderSearchInfo().getModuleMap();
  AddPath(WritingModule->PresumedModuleMapFile.empty()
              ? Map.getModuleMapFileForUniquing(WritingModule)->getName()
              : StringRef(WritingModule->PresumedModuleMapFile),
          Record);

  // Additional module map files.
  if (auto *AdditionalModMaps =
          Map.getAdditionalModuleMapFiles(WritingModule)) {
    Record.push_back(AdditionalModMaps->size());
    SmallVector<const FileEntry *, 1> ModMaps(AdditionalModMaps->begin(),
                                              AdditionalModMaps->end());
    llvm::sort(ModMaps, [](const FileEntry *A, const FileEntry *B) {
      return A->getName() < B->getName();
    });
    for (const FileEntry *F : ModMaps)
      AddPath(F->getName(), Record);
  } else {
    Record.push_back(0);
  }

  Stream.EmitRecord(MODULE_MAP_FILE, Record);
}

// Imports
if (Chain) {
  serialization::ModuleManager &Mgr = Chain->getModuleManager();
  Record.clear();

  for (ModuleFile &M : Mgr) {
    // Skip modules that weren't directly imported.
    if (!M.isDirectlyImported())
      continue;

    Record.push_back((unsigned)M.Kind); // FIXME: Stable encoding
    AddSourceLocation(M.ImportLoc, Record);

    // If we have calculated signature, there is no need to store
    // the size or timestamp.
    Record.push_back(M.Signature ? 0 : M.File->getSize());
    Record.push_back(M.Signature ? 0 : getTimestampForOutput(M.File));

    llvm::append_range(Record, M.Signature);

    AddString(M.ModuleName, Record);
    AddPath(M.FileName, Record);
  }
  Stream.EmitRecord(IMPORTS, Record);
}

// Write the options block.
Stream.EnterSubblock(OPTIONS_BLOCK_ID, 4);

// Language options.
Record.clear();
const LangOptions &LangOpts = Context.getLangOpts();
1371#define LANGOPT(Name, Bits, Default, Description) \
Record.push_back(LangOpts.Name);
1373#define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
Record.push_back(static_cast<unsigned>(LangOpts.get##Name()));
1375#include "clang/Basic/LangOptions.def"
1376#define SANITIZER(NAME, ID)                                                    \
Record.push_back(LangOpts.Sanitize.has(SanitizerKind::ID));
1378#include "clang/Basic/Sanitizers.def"

Record.push_back(LangOpts.ModuleFeatures.size());
for (StringRef Feature : LangOpts.ModuleFeatures)
  AddString(Feature, Record);

Record.push_back((unsigned) LangOpts.ObjCRuntime.getKind());
AddVersionTuple(LangOpts.ObjCRuntime.getVersion(), Record);

AddString(LangOpts.CurrentModule, Record);

// Comment options.
Record.push_back(LangOpts.CommentOpts.BlockCommandNames.size());
for (const auto &I : LangOpts.CommentOpts.BlockCommandNames) {
  AddString(I, Record);
}
Record.push_back(LangOpts.CommentOpts.ParseAllComments);

// OpenMP offloading options.
Record.push_back(LangOpts.OMPTargetTriples.size());
for (auto &T : LangOpts.OMPTargetTriples)
  AddString(T.getTriple(), Record);

AddString(LangOpts.OMPHostIRFile, Record);

Stream.EmitRecord(LANGUAGE_OPTIONS, Record);

// Target options.
Record.clear();
const TargetInfo &Target = Context.getTargetInfo();
const TargetOptions &TargetOpts = Target.getTargetOpts();
AddString(TargetOpts.Triple, Record);
AddString(TargetOpts.CPU, Record);
AddString(TargetOpts.TuneCPU, Record);
AddString(TargetOpts.ABI, Record);
Record.push_back(TargetOpts.FeaturesAsWritten.size());
for (unsigned I = 0, N = TargetOpts.FeaturesAsWritten.size(); I != N; ++I) {
  AddString(TargetOpts.FeaturesAsWritten[I], Record);
}
Record.push_back(TargetOpts.Features.size());
for (unsigned I = 0, N = TargetOpts.Features.size(); I != N; ++I) {
  AddString(TargetOpts.Features[I], Record);
}
Stream.EmitRecord(TARGET_OPTIONS, Record);

// File system options.
Record.clear();
const FileSystemOptions &FSOpts =
    Context.getSourceManager().getFileManager().getFileSystemOpts();
AddString(FSOpts.WorkingDir, Record);
Stream.EmitRecord(FILE_SYSTEM_OPTIONS, Record);

// Header search options.
Record.clear();
const HeaderSearchOptions &HSOpts =
    PP.getHeaderSearchInfo().getHeaderSearchOpts();

AddString(HSOpts.Sysroot, Record);
AddString(HSOpts.ResourceDir, Record);
AddString(HSOpts.ModuleCachePath, Record);
AddString(HSOpts.ModuleUserBuildPath, Record);
Record.push_back(HSOpts.DisableModuleHash);
Record.push_back(HSOpts.ImplicitModuleMaps);
Record.push_back(HSOpts.ModuleMapFileHomeIsCwd);
Record.push_back(HSOpts.EnablePrebuiltImplicitModules);
Record.push_back(HSOpts.UseBuiltinIncludes);
Record.push_back(HSOpts.UseStandardSystemIncludes);
Record.push_back(HSOpts.UseStandardCXXIncludes);
Record.push_back(HSOpts.UseLibcxx);
// Write out the specific module cache path that contains the module files.
AddString(PP.getHeaderSearchInfo().getModuleCachePath(), Record);
Stream.EmitRecord(HEADER_SEARCH_OPTIONS, Record);

// Preprocessor options.
Record.clear();
const PreprocessorOptions &PPOpts = PP.getPreprocessorOpts();

// Macro definitions.
Record.push_back(PPOpts.Macros.size());
for (unsigned I = 0, N = PPOpts.Macros.size(); I != N; ++I) {
  AddString(PPOpts.Macros[I].first, Record);
  Record.push_back(PPOpts.Macros[I].second);
}

// Includes
Record.push_back(PPOpts.Includes.size());
for (unsigned I = 0, N = PPOpts.Includes.size(); I != N; ++I)
  AddString(PPOpts.Includes[I], Record);

// Macro includes
Record.push_back(PPOpts.MacroIncludes.size());
for (unsigned I = 0, N = PPOpts.MacroIncludes.size(); I != N; ++I)
  AddString(PPOpts.MacroIncludes[I], Record);

Record.push_back(PPOpts.UsePredefines);
// Detailed record is important since it is used for the module cache hash.
Record.push_back(PPOpts.DetailedRecord);
AddString(PPOpts.ImplicitPCHInclude, Record);
Record.push_back(static_cast<unsigned>(PPOpts.ObjCXXARCStandardLibrary));
Stream.EmitRecord(PREPROCESSOR_OPTIONS, Record);

// Leave the options block.
Stream.ExitBlock();

// Original file name and file ID
SourceManager &SM = Context.getSourceManager();
if (const FileEntry *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
  auto FileAbbrev = std::make_shared<BitCodeAbbrev>();
  FileAbbrev->Add(BitCodeAbbrevOp(ORIGINAL_FILE));
  FileAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // File ID
  FileAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // File name
  unsigned FileAbbrevCode = Stream.EmitAbbrev(std::move(FileAbbrev));

  Record.clear();
  Record.push_back(ORIGINAL_FILE);
  AddFileID(SM.getMainFileID(), Record);
  EmitRecordWithPath(FileAbbrevCode, Record, MainFile->getName());
}

Record.clear();
AddFileID(SM.getMainFileID(), Record);
Stream.EmitRecord(ORIGINAL_FILE_ID, Record);

WriteInputFiles(Context.SourceMgr,
                PP.getHeaderSearchInfo().getHeaderSearchOpts());
Stream.ExitBlock();
1504}

1506namespace  {

1508/// An input file.
1509struct InputFileEntry {
FileEntryRef File;
bool IsSystemFile;
bool IsTransient;
bool BufferOverridden;
bool IsTopLevelModuleMap;
uint32_t ContentHash[2];

InputFileEntry(FileEntryRef File) : File(File) {}
1518};

1520} // namespace

1522void ASTWriter::WriteInputFiles(SourceManager &SourceMgr,
                              HeaderSearchOptions &HSOpts) {
using namespace llvm;

Stream.EnterSubblock(INPUT_FILES_BLOCK_ID, 4);

// Create input-file abbreviation.
auto IFAbbrev = std::make_shared<BitCodeAbbrev>();
IFAbbrev->Add(BitCodeAbbrevOp(INPUT_FILE));
IFAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ID
IFAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 12)); // Size
IFAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 32)); // Modification time
IFAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Overridden
IFAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Transient
IFAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Module map
IFAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // File name
unsigned IFAbbrevCode = Stream.EmitAbbrev(std::move(IFAbbrev));

// Create input file hash abbreviation.
auto IFHAbbrev = std::make_shared<BitCodeAbbrev>();
IFHAbbrev->Add(BitCodeAbbrevOp(INPUT_FILE_HASH));
IFHAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
IFHAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
unsigned IFHAbbrevCode = Stream.EmitAbbrev(std::move(IFHAbbrev));

// Get all ContentCache objects for files.
std::vector<InputFileEntry> UserFiles;
std::vector<InputFileEntry> SystemFiles;
for (unsigned I = 1, N = SourceMgr.local_sloc_entry_size(); I != N; ++I) {
  // Get this source location entry.
  const SrcMgr::SLocEntry *SLoc = &SourceMgr.getLocalSLocEntry(I);
  assert(&SourceMgr.getSLocEntry(FileID::get(I)) == SLoc)(static_cast <bool> (&SourceMgr.getSLocEntry(FileID
::get(I)) == SLoc) ? void (0) : __assert_fail ("&SourceMgr.getSLocEntry(FileID::get(I)) == SLoc"
, "clang/lib/Serialization/ASTWriter.cpp", 1553, __extension__
 __PRETTY_FUNCTION__));

  // We only care about file entries that were not overridden.
  if (!SLoc->isFile())
    continue;
  const SrcMgr::FileInfo &File = SLoc->getFile();
  const SrcMgr::ContentCache *Cache = &File.getContentCache();
  if (!Cache->OrigEntry)
    continue;

  // Do not emit input files that do not affect current module.
  if (!IsSLocAffecting[I])
    continue;

  InputFileEntry Entry(*Cache->OrigEntry);
  Entry.IsSystemFile = isSystem(File.getFileCharacteristic());
  Entry.IsTransient = Cache->IsTransient;
  Entry.BufferOverridden = Cache->BufferOverridden;
  Entry.IsTopLevelModuleMap = isModuleMap(File.getFileCharacteristic()) &&
                              File.getIncludeLoc().isInvalid();

  auto ContentHash = hash_code(-1);
  if (PP->getHeaderSearchInfo()
          .getHeaderSearchOpts()
          .ValidateASTInputFilesContent) {
    auto MemBuff = Cache->getBufferIfLoaded();
    if (MemBuff)
      ContentHash = hash_value(MemBuff->getBuffer());
    else
      PP->Diag(SourceLocation(), diag::err_module_unable_to_hash_content)
          << Entry.File.getName();
  }
  auto CH = llvm::APInt(64, ContentHash);
  Entry.ContentHash[0] =
      static_cast<uint32_t>(CH.getLoBits(32).getZExtValue());
  Entry.ContentHash[1] =
      static_cast<uint32_t>(CH.getHiBits(32).getZExtValue());

  if (Entry.IsSystemFile)
    SystemFiles.push_back(Entry);
  else
    UserFiles.push_back(Entry);
}

// User files go at the front, system files at the back.
auto SortedFiles = llvm::concat<InputFileEntry>(std::move(UserFiles),
                                                std::move(SystemFiles));

unsigned UserFilesNum = 0;
// Write out all of the input files.
std::vector<uint64_t> InputFileOffsets;
for (const auto &Entry : SortedFiles) {
  uint32_t &InputFileID = InputFileIDs[Entry.File];
  if (InputFileID != 0)
    continue; // already recorded this file.

  // Record this entry's offset.
  InputFileOffsets.push_back(Stream.GetCurrentBitNo());

  InputFileID = InputFileOffsets.size();

  if (!Entry.IsSystemFile)
    ++UserFilesNum;

  // Emit size/modification time for this file.
  // And whether this file was overridden.
  {
    RecordData::value_type Record[] = {
        INPUT_FILE,
        InputFileOffsets.size(),
        (uint64_t)Entry.File.getSize(),
        (uint64_t)getTimestampForOutput(Entry.File),
        Entry.BufferOverridden,
        Entry.IsTransient,
        Entry.IsTopLevelModuleMap};

    EmitRecordWithPath(IFAbbrevCode, Record, Entry.File.getNameAsRequested());
  }

  // Emit content hash for this file.
  {
    RecordData::value_type Record[] = {INPUT_FILE_HASH, Entry.ContentHash[0],
                                       Entry.ContentHash[1]};
    Stream.EmitRecordWithAbbrev(IFHAbbrevCode, Record);
  }
}

Stream.ExitBlock();

// Create input file offsets abbreviation.
auto OffsetsAbbrev = std::make_shared<BitCodeAbbrev>();
OffsetsAbbrev->Add(BitCodeAbbrevOp(INPUT_FILE_OFFSETS));
OffsetsAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // # input files
OffsetsAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // # non-system
                                                              //   input files
OffsetsAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));   // Array
unsigned OffsetsAbbrevCode = Stream.EmitAbbrev(std::move(OffsetsAbbrev));

// Write input file offsets.
RecordData::value_type Record[] = {INPUT_FILE_OFFSETS,
                                   InputFileOffsets.size(), UserFilesNum};
Stream.EmitRecordWithBlob(OffsetsAbbrevCode, Record, bytes(InputFileOffsets));
1655}

1657//===----------------------------------------------------------------------===//
1658// Source Manager Serialization
1659//===----------------------------------------------------------------------===//

1661/// Create an abbreviation for the SLocEntry that refers to a
1662/// file.
1663static unsigned CreateSLocFileAbbrev(llvm::BitstreamWriter &Stream) {
using namespace llvm;

auto Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(SM_SLOC_FILE_ENTRY));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Offset
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Include location
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Characteristic
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Line directives
// FileEntry fields.
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Input File ID
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // NumCreatedFIDs
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 24)); // FirstDeclIndex
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // NumDecls
return Stream.EmitAbbrev(std::move(Abbrev));
1678}

1680/// Create an abbreviation for the SLocEntry that refers to a
1681/// buffer.
1682static unsigned CreateSLocBufferAbbrev(llvm::BitstreamWriter &Stream) {
using namespace llvm;

auto Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(SM_SLOC_BUFFER_ENTRY));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Offset
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Include location
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Characteristic
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Line directives
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Buffer name blob
return Stream.EmitAbbrev(std::move(Abbrev));
1693}

1695/// Create an abbreviation for the SLocEntry that refers to a
1696/// buffer's blob.
1697static unsigned CreateSLocBufferBlobAbbrev(llvm::BitstreamWriter &Stream,
                                         bool Compressed) {
using namespace llvm;

auto Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(Compressed ? SM_SLOC_BUFFER_BLOB_COMPRESSED
                                       : SM_SLOC_BUFFER_BLOB));
if (Compressed)
  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Uncompressed size
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Blob
return Stream.EmitAbbrev(std::move(Abbrev));
1708}

1710/// Create an abbreviation for the SLocEntry that refers to a macro
1711/// expansion.
1712static unsigned CreateSLocExpansionAbbrev(llvm::BitstreamWriter &Stream) {
using namespace llvm;

auto Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(SM_SLOC_EXPANSION_ENTRY));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Offset
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Spelling location
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Start location
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // End location
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Is token range
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Token length
return Stream.EmitAbbrev(std::move(Abbrev));
1724}

1726/// Emit key length and data length as ULEB-encoded data, and return them as a
1727/// pair.
1728static std::pair<unsigned, unsigned>
1729emitULEBKeyDataLength(unsigned KeyLen, unsigned DataLen, raw_ostream &Out) {
llvm::encodeULEB128(KeyLen, Out);
llvm::encodeULEB128(DataLen, Out);
return std::make_pair(KeyLen, DataLen);
1733}

1735namespace {

// Trait used for the on-disk hash table of header search information.
class HeaderFileInfoTrait {
  ASTWriter &Writer;

  // Keep track of the framework names we've used during serialization.
  SmallString<128> FrameworkStringData;
  llvm::StringMap<unsigned> FrameworkNameOffset;

public:
  HeaderFileInfoTrait(ASTWriter &Writer) : Writer(Writer) {}

  struct key_type {
    StringRef Filename;
    off_t Size;
    time_t ModTime;
  };
  using key_type_ref = const key_type &;

  using UnresolvedModule =
      llvm::PointerIntPair<Module *, 2, ModuleMap::ModuleHeaderRole>;

  struct data_type {
    const HeaderFileInfo &HFI;
    ArrayRef<ModuleMap::KnownHeader> KnownHeaders;
    UnresolvedModule Unresolved;
  };
  using data_type_ref = const data_type &;

  using hash_value_type = unsigned;
  using offset_type = unsigned;

  hash_value_type ComputeHash(key_type_ref key) {
    // The hash is based only on size/time of the file, so that the reader can
    // match even when symlinking or excess path elements ("foo/../", "../")
    // change the form of the name. However, complete path is still the key.
    return llvm::hash_combine(key.Size, key.ModTime);
  }

  std::pair<unsigned, unsigned>
  EmitKeyDataLength(raw_ostream& Out, key_type_ref key, data_type_ref Data) {
    unsigned KeyLen = key.Filename.size() + 1 + 8 + 8;
    unsigned DataLen = 1 + 4 + 4;
    for (auto ModInfo : Data.KnownHeaders)
      if (Writer.getLocalOrImportedSubmoduleID(ModInfo.getModule()))
        DataLen += 4;
    if (Data.Unresolved.getPointer())
      DataLen += 4;
    return emitULEBKeyDataLength(KeyLen, DataLen, Out);
  }

  void EmitKey(raw_ostream& Out, key_type_ref key, unsigned KeyLen) {
    using namespace llvm::support;

    endian::Writer LE(Out, little);
    LE.write<uint64_t>(key.Size);
    KeyLen -= 8;
    LE.write<uint64_t>(key.ModTime);
    KeyLen -= 8;
    Out.write(key.Filename.data(), KeyLen);
  }

  void EmitData(raw_ostream &Out, key_type_ref key,
                data_type_ref Data, unsigned DataLen) {
    using namespace llvm::support;

    endian::Writer LE(Out, little);
    uint64_t Start = Out.tell(); (void)Start;

    unsigned char Flags = (Data.HFI.isImport << 5)
                        | (Data.HFI.isPragmaOnce << 4)
                        | (Data.HFI.DirInfo << 1)
                        | Data.HFI.IndexHeaderMapHeader;
    LE.write<uint8_t>(Flags);

    if (!Data.HFI.ControllingMacro)
      LE.write<uint32_t>(Data.HFI.ControllingMacroID);
    else
      LE.write<uint32_t>(Writer.getIdentifierRef(Data.HFI.ControllingMacro));

    unsigned Offset = 0;
    if (!Data.HFI.Framework.empty()) {
      // If this header refers into a framework, save the framework name.
      llvm::StringMap<unsigned>::iterator Pos
        = FrameworkNameOffset.find(Data.HFI.Framework);
      if (Pos == FrameworkNameOffset.end()) {
        Offset = FrameworkStringData.size() + 1;
        FrameworkStringData.append(Data.HFI.Framework);
        FrameworkStringData.push_back(0);

        FrameworkNameOffset[Data.HFI.Framework] = Offset;
      } else
        Offset = Pos->second;
    }
    LE.write<uint32_t>(Offset);

    auto EmitModule = [&](Module *M, ModuleMap::ModuleHeaderRole Role) {
      if (uint32_t ModID = Writer.getLocalOrImportedSubmoduleID(M)) {
        uint32_t Value = (ModID << 3) | (unsigned)Role;
        assert((Value >> 3) == ModID && "overflow in header module info")(static_cast <bool> ((Value >> 3) == ModID &&
 "overflow in header module info") ? void (0) : __assert_fail
 ("(Value >> 3) == ModID && \"overflow in header module info\""
, "clang/lib/Serialization/ASTWriter.cpp", 1835, __extension__
 __PRETTY_FUNCTION__));
        LE.write<uint32_t>(Value);
      }
    };

    for (auto ModInfo : Data.KnownHeaders)
      EmitModule(ModInfo.getModule(), ModInfo.getRole());
    if (Data.Unresolved.getPointer())
      EmitModule(Data.Unresolved.getPointer(), Data.Unresolved.getInt());

    assert(Out.tell() - Start == DataLen && "Wrong data length")(static_cast <bool> (Out.tell() - Start == DataLen &&
 "Wrong data length") ? void (0) : __assert_fail ("Out.tell() - Start == DataLen && \"Wrong data length\""
, "clang/lib/Serialization/ASTWriter.cpp", 1845, __extension__
 __PRETTY_FUNCTION__));
  }

  const char *strings_begin() const { return FrameworkStringData.begin(); }
  const char *strings_end() const { return FrameworkStringData.end(); }
};

1852} // namespace

1854/// Write the header search block for the list of files that
1855///
1856/// \param HS The header search structure to save.
1857void ASTWriter::WriteHeaderSearch(const HeaderSearch &HS) {
HeaderFileInfoTrait GeneratorTrait(*this);
llvm::OnDiskChainedHashTableGenerator<HeaderFileInfoTrait> Generator;
SmallVector<const char *, 4> SavedStrings;
unsigned NumHeaderSearchEntries = 0;

// Find all unresolved headers for the current module. We generally will
// have resolved them before we get here, but not necessarily: we might be
// compiling a preprocessed module, where there is no requirement for the
// original files to exist any more.
const HeaderFileInfo Empty; // So we can take a reference.
if (WritingModule) {
  llvm::SmallVector<Module *, 16> Worklist(1, WritingModule);
  while (!Worklist.empty()) {
    Module *M = Worklist.pop_back_val();
    // We don't care about headers in unimportable submodules.
    if (M->isUnimportable())
      continue;

    // Map to disk files where possible, to pick up any missing stat
    // information. This also means we don't need to check the unresolved
    // headers list when emitting resolved headers in the first loop below.
    // FIXME: It'd be preferable to avoid doing this if we were given
    // sufficient stat information in the module map.
    HS.getModuleMap().resolveHeaderDirectives(M, /*File=*/std::nullopt);

    // If the file didn't exist, we can still create a module if we were given
    // enough information in the module map.
    for (auto U : M->MissingHeaders) {
      // Check that we were given enough information to build a module
      // without this file existing on disk.
      if (!U.Size || (!U.ModTime && IncludeTimestamps)) {
        PP->Diag(U.FileNameLoc, diag::err_module_no_size_mtime_for_header)
            << WritingModule->getFullModuleName() << U.Size.has_value()
            << U.FileName;
        continue;
      }

      // Form the effective relative pathname for the file.
      SmallString<128> Filename(M->Directory->getName());
      llvm::sys::path::append(Filename, U.FileName);
      PreparePathForOutput(Filename);

      StringRef FilenameDup = strdup(Filename.c_str());
      SavedStrings.push_back(FilenameDup.data());

      HeaderFileInfoTrait::key_type Key = {
        FilenameDup, *U.Size, IncludeTimestamps ? *U.ModTime : 0
      };
      HeaderFileInfoTrait::data_type Data = {
        Empty, {}, {M, ModuleMap::headerKindToRole(U.Kind)}
      };
      // FIXME: Deal with cases where there are multiple unresolved header
      // directives in different submodules for the same header.
      Generator.insert(Key, Data, GeneratorTrait);
      ++NumHeaderSearchEntries;
    }

    Worklist.append(M->submodule_begin(), M->submodule_end());
  }
}

SmallVector<const FileEntry *, 16> FilesByUID;
HS.getFileMgr().GetUniqueIDMapping(FilesByUID);

if (FilesByUID.size() > HS.header_file_size())
  FilesByUID.resize(HS.header_file_size());

for (unsigned UID = 0, LastUID = FilesByUID.size(); UID != LastUID; ++UID) {
  const FileEntry *File = FilesByUID[UID];
  if (!File)
    continue;

  // Get the file info. This will load info from the external source if
  // necessary. Skip emitting this file if we have no information on it
  // as a header file (in which case HFI will be null) or if it hasn't
  // changed since it was loaded. Also skip it if it's for a modular header
  // from a different module; in that case, we rely on the module(s)
  // containing the header to provide this information.
  const HeaderFileInfo *HFI =
      HS.getExistingFileInfo(File, /*WantExternal*/!Chain);
  if (!HFI || (HFI->isModuleHeader && !HFI->isCompilingModuleHeader))
    continue;

  // Massage the file path into an appropriate form.
  StringRef Filename = File->getName();
  SmallString<128> FilenameTmp(Filename);
  if (PreparePathForOutput(FilenameTmp)) {
    // If we performed any translation on the file name at all, we need to
    // save this string, since the generator will refer to it later.
    Filename = StringRef(strdup(FilenameTmp.c_str()));
    SavedStrings.push_back(Filename.data());
  }

  HeaderFileInfoTrait::key_type Key = {
    Filename, File->getSize(), getTimestampForOutput(File)
  };
  HeaderFileInfoTrait::data_type Data = {
    *HFI, HS.getModuleMap().findResolvedModulesForHeader(File), {}
  };
  Generator.insert(Key, Data, GeneratorTrait);
  ++NumHeaderSearchEntries;
}

// Create the on-disk hash table in a buffer.
SmallString<4096> TableData;
uint32_t BucketOffset;
{
  using namespace llvm::support;

  llvm::raw_svector_ostream Out(TableData);
  // Make sure that no bucket is at offset 0
  endian::write<uint32_t>(Out, 0, little);
  BucketOffset = Generator.Emit(Out, GeneratorTrait);
}

// Create a blob abbreviation
using namespace llvm;

auto Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(HEADER_SEARCH_TABLE));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
unsigned TableAbbrev = Stream.EmitAbbrev(std::move(Abbrev));

// Write the header search table
RecordData::value_type Record[] = {HEADER_SEARCH_TABLE, BucketOffset,
                                   NumHeaderSearchEntries, TableData.size()};
TableData.append(GeneratorTrait.strings_begin(),GeneratorTrait.strings_end());
Stream.EmitRecordWithBlob(TableAbbrev, Record, TableData);

// Free all of the strings we had to duplicate.
for (unsigned I = 0, N = SavedStrings.size(); I != N; ++I)
  free(const_cast<char *>(SavedStrings[I]));
1993}

1995static void emitBlob(llvm::BitstreamWriter &Stream, StringRef Blob,
                   unsigned SLocBufferBlobCompressedAbbrv,
                   unsigned SLocBufferBlobAbbrv) {
using RecordDataType = ASTWriter::RecordData::value_type;

// Compress the buffer if possible. We expect that almost all PCM
// consumers will not want its contents.
SmallVector<uint8_t, 0> CompressedBuffer;
if (llvm::compression::zstd::isAvailable()) {
  llvm::compression::zstd::compress(
      llvm::arrayRefFromStringRef(Blob.drop_back(1)), CompressedBuffer, 9);
  RecordDataType Record[] = {SM_SLOC_BUFFER_BLOB_COMPRESSED, Blob.size() - 1};
  Stream.EmitRecordWithBlob(SLocBufferBlobCompressedAbbrv, Record,
                            llvm::toStringRef(CompressedBuffer));
  return;
}
if (llvm::compression::zlib::isAvailable()) {
  llvm::compression::zlib::compress(
      llvm::arrayRefFromStringRef(Blob.drop_back(1)), CompressedBuffer);
  RecordDataType Record[] = {SM_SLOC_BUFFER_BLOB_COMPRESSED, Blob.size() - 1};
  Stream.EmitRecordWithBlob(SLocBufferBlobCompressedAbbrv, Record,
                            llvm::toStringRef(CompressedBuffer));
  return;
}

RecordDataType Record[] = {SM_SLOC_BUFFER_BLOB};
Stream.EmitRecordWithBlob(SLocBufferBlobAbbrv, Record, Blob);
2022}

2024/// Writes the block containing the serialized form of the
2025/// source manager.
2026///
2027/// TODO: We should probably use an on-disk hash table (stored in a
2028/// blob), indexed based on the file name, so that we only create
2029/// entries for files that we actually need. In the common case (no
2030/// errors), we probably won't have to create file entries for any of
2031/// the files in the AST.
2032void ASTWriter::WriteSourceManagerBlock(SourceManager &SourceMgr,
                                      const Preprocessor &PP) {
RecordData Record;

// Enter the source manager block.
Stream.EnterSubblock(SOURCE_MANAGER_BLOCK_ID, 4);
const uint64_t SourceManagerBlockOffset = Stream.GetCurrentBitNo();

// Abbreviations for the various kinds of source-location entries.
unsigned SLocFileAbbrv = CreateSLocFileAbbrev(Stream);
unsigned SLocBufferAbbrv = CreateSLocBufferAbbrev(Stream);
unsigned SLocBufferBlobAbbrv = CreateSLocBufferBlobAbbrev(Stream, false);
unsigned SLocBufferBlobCompressedAbbrv =
    CreateSLocBufferBlobAbbrev(Stream, true);
unsigned SLocExpansionAbbrv = CreateSLocExpansionAbbrev(Stream);

// Write out the source location entry table. We skip the first
// entry, which is always the same dummy entry.
std::vector<uint32_t> SLocEntryOffsets;
uint64_t SLocEntryOffsetsBase = Stream.GetCurrentBitNo();
RecordData PreloadSLocs;
SLocEntryOffsets.reserve(SourceMgr.local_sloc_entry_size() - 1);
for (unsigned I = 1, N = SourceMgr.local_sloc_entry_size();
     I != N; ++I) {
  // Get this source location entry.
  const SrcMgr::SLocEntry *SLoc = &SourceMgr.getLocalSLocEntry(I);
  FileID FID = FileID::get(I);
  assert(&SourceMgr.getSLocEntry(FID) == SLoc)(static_cast <bool> (&SourceMgr.getSLocEntry(FID) ==
 SLoc) ? void (0) : __assert_fail ("&SourceMgr.getSLocEntry(FID) == SLoc"
, "clang/lib/Serialization/ASTWriter.cpp", 2059, __extension__
 __PRETTY_FUNCTION__));

  // Record the offset of this source-location entry.
  uint64_t Offset = Stream.GetCurrentBitNo() - SLocEntryOffsetsBase;
  assert((Offset >> 32) == 0 && "SLocEntry offset too large")(static_cast <bool> ((Offset >> 32) == 0 &&
 "SLocEntry offset too large") ? void (0) : __assert_fail ("(Offset >> 32) == 0 && \"SLocEntry offset too large\""
, "clang/lib/Serialization/ASTWriter.cpp", 2063, __extension__
 __PRETTY_FUNCTION__));

  // Figure out which record code to use.
  unsigned Code;
  if (SLoc->isFile()) {
    const SrcMgr::ContentCache *Cache = &SLoc->getFile().getContentCache();
    if (Cache->OrigEntry) {
      Code = SM_SLOC_FILE_ENTRY;
    } else
      Code = SM_SLOC_BUFFER_ENTRY;
  } else
    Code = SM_SLOC_EXPANSION_ENTRY;
  Record.clear();
  Record.push_back(Code);

  if (SLoc->isFile()) {
    const SrcMgr::FileInfo &File = SLoc->getFile();
    const SrcMgr::ContentCache *Content = &File.getContentCache();
    // Do not emit files that were not listed as inputs.
    if (!IsSLocAffecting[I])
      continue;
    SLocEntryOffsets.push_back(Offset);
    // Starting offset of this entry within this module, so skip the dummy.
    Record.push_back(getAdjustedOffset(SLoc->getOffset()) - 2);
    AddSourceLocation(File.getIncludeLoc(), Record);
    Record.push_back(File.getFileCharacteristic()); // FIXME: stable encoding
    Record.push_back(File.hasLineDirectives());

    bool EmitBlob = false;
    if (Content->OrigEntry) {
      assert(Content->OrigEntry == Content->ContentsEntry &&(static_cast <bool> (Content->OrigEntry == Content->
ContentsEntry && "Writing to AST an overridden file is not supported"
) ? void (0) : __assert_fail ("Content->OrigEntry == Content->ContentsEntry && \"Writing to AST an overridden file is not supported\""
, "clang/lib/Serialization/ASTWriter.cpp", 2094, __extension__
 __PRETTY_FUNCTION__))
             "Writing to AST an overridden file is not supported")(static_cast <bool> (Content->OrigEntry == Content->
ContentsEntry && "Writing to AST an overridden file is not supported"
) ? void (0) : __assert_fail ("Content->OrigEntry == Content->ContentsEntry && \"Writing to AST an overridden file is not supported\""
, "clang/lib/Serialization/ASTWriter.cpp", 2094, __extension__
 __PRETTY_FUNCTION__));

      // The source location entry is a file. Emit input file ID.
      assert(InputFileIDs[Content->OrigEntry] != 0 && "Missed file entry")(static_cast <bool> (InputFileIDs[Content->OrigEntry
] != 0 && "Missed file entry") ? void (0) : __assert_fail
 ("InputFileIDs[Content->OrigEntry] != 0 && \"Missed file entry\""
, "clang/lib/Serialization/ASTWriter.cpp", 2097, __extension__
 __PRETTY_FUNCTION__));
      Record.push_back(InputFileIDs[Content->OrigEntry]);

      Record.push_back(getAdjustedNumCreatedFIDs(FID));

      FileDeclIDsTy::iterator FDI = FileDeclIDs.find(FID);
      if (FDI != FileDeclIDs.end()) {
        Record.push_back(FDI->second->FirstDeclIndex);
        Record.push_back(FDI->second->DeclIDs.size());
      } else {
        Record.push_back(0);
        Record.push_back(0);
      }

      Stream.EmitRecordWithAbbrev(SLocFileAbbrv, Record);

      if (Content->BufferOverridden || Content->IsTransient)
        EmitBlob = true;
    } else {
      // The source location entry is a buffer. The blob associated
      // with this entry contains the contents of the buffer.

      // We add one to the size so that we capture the trailing NULL
      // that is required by llvm::MemoryBuffer::getMemBuffer (on
      // the reader side).
      llvm::Optional<llvm::MemoryBufferRef> Buffer =
          Content->getBufferOrNone(PP.getDiagnostics(), PP.getFileManager());
      StringRef Name = Buffer ? Buffer->getBufferIdentifier() : "";
      Stream.EmitRecordWithBlob(SLocBufferAbbrv, Record,
                                StringRef(Name.data(), Name.size() + 1));
      EmitBlob = true;

      if (Name == "<built-in>")
        PreloadSLocs.push_back(SLocEntryOffsets.size());
    }

    if (EmitBlob) {
      // Include the implicit terminating null character in the on-disk buffer
      // if we're writing it uncompressed.
      llvm::Optional<llvm::MemoryBufferRef> Buffer =
          Content->getBufferOrNone(PP.getDiagnostics(), PP.getFileManager());
      if (!Buffer)
        Buffer = llvm::MemoryBufferRef("<<<INVALID BUFFER>>>", "");
      StringRef Blob(Buffer->getBufferStart(), Buffer->getBufferSize() + 1);
      emitBlob(Stream, Blob, SLocBufferBlobCompressedAbbrv,
               SLocBufferBlobAbbrv);
    }
  } else {
    // The source location entry is a macro expansion.
    const SrcMgr::ExpansionInfo &Expansion = SLoc->getExpansion();
    SLocEntryOffsets.push_back(Offset);
    // Starting offset of this entry within this module, so skip the dummy.
    Record.push_back(getAdjustedOffset(SLoc->getOffset()) - 2);
    LocSeq::State Seq;
    AddSourceLocation(Expansion.getSpellingLoc(), Record, Seq);
    AddSourceLocation(Expansion.getExpansionLocStart(), Record, Seq);
    AddSourceLocation(Expansion.isMacroArgExpansion()
                          ? SourceLocation()
                          : Expansion.getExpansionLocEnd(),
                      Record, Seq);
    Record.push_back(Expansion.isExpansionTokenRange());

    // Compute the token length for this macro expansion.
    SourceLocation::UIntTy NextOffset = SourceMgr.getNextLocalOffset();
    if (I + 1 != N)
      NextOffset = SourceMgr.getLocalSLocEntry(I + 1).getOffset();
    Record.push_back(getAdjustedOffset(NextOffset - SLoc->getOffset()) - 1);
    Stream.EmitRecordWithAbbrev(SLocExpansionAbbrv, Record);
  }
}

Stream.ExitBlock();

if (SLocEntryOffsets.empty())
  return;

// Write the source-location offsets table into the AST block. This
// table is used for lazily loading source-location information.
using namespace llvm;

auto Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(SOURCE_LOCATION_OFFSETS));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 16)); // # of slocs
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 16)); // total size
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 32)); // base offset
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // offsets
unsigned SLocOffsetsAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
{
  RecordData::value_type Record[] = {
      SOURCE_LOCATION_OFFSETS, SLocEntryOffsets.size(),
      getAdjustedOffset(SourceMgr.getNextLocalOffset()) - 1 /* skip dummy */,
      SLocEntryOffsetsBase - SourceManagerBlockOffset};
  Stream.EmitRecordWithBlob(SLocOffsetsAbbrev, Record,
                            bytes(SLocEntryOffsets));
}
// Write the source location entry preloads array, telling the AST
// reader which source locations entries it should load eagerly.
Stream.EmitRecord(SOURCE_LOCATION_PRELOADS, PreloadSLocs);

// Write the line table. It depends on remapping working, so it must come
// after the source location offsets.
if (SourceMgr.hasLineTable()) {
  LineTableInfo &LineTable = SourceMgr.getLineTable();

  Record.clear();

  // Emit the needed file names.
  llvm::DenseMap<int, int> FilenameMap;
  FilenameMap[-1] = -1; // For unspecified filenames.
  for (const auto &L : LineTable) {
    if (L.first.ID < 0)
      continue;
    for (auto &LE : L.second) {
      if (FilenameMap.insert(std::make_pair(LE.FilenameID,
                                            FilenameMap.size() - 1)).second)
        AddPath(LineTable.getFilename(LE.FilenameID), Record);
    }
  }
  Record.push_back(0);

  // Emit the line entries
  for (const auto &L : LineTable) {
    // Only emit entries for local files.
    if (L.first.ID < 0)
      continue;

    AddFileID(L.first, Record);

    // Emit the line entries
    Record.push_back(L.second.size());
    for (const auto &LE : L.second) {
      Record.push_back(LE.FileOffset);
      Record.push_back(LE.LineNo);
      Record.push_back(FilenameMap[LE.FilenameID]);
      Record.push_back((unsigned)LE.FileKind);
      Record.push_back(LE.IncludeOffset);
    }
  }

  Stream.EmitRecord(SOURCE_MANAGER_LINE_TABLE, Record);
}
2238}

2240//===----------------------------------------------------------------------===//
2241// Preprocessor Serialization
2242//===----------------------------------------------------------------------===//

2244static bool shouldIgnoreMacro(MacroDirective *MD, bool IsModule,
                            const Preprocessor &PP) {
if (MacroInfo *MI = MD->getMacroInfo())
  if (MI->isBuiltinMacro())
    return true;

if (IsModule) {
  SourceLocation Loc = MD->getLocation();
  if (Loc.isInvalid())
    return true;
  if (PP.getSourceManager().getFileID(Loc) == PP.getPredefinesFileID())
    return true;
}

return false;
2259}

2261void ASTWriter::writeIncludedFiles(raw_ostream &Out, const Preprocessor &PP) {
using namespace llvm::support;

const Preprocessor::IncludedFilesSet &IncludedFiles = PP.getIncludedFiles();

std::vector<uint32_t> IncludedInputFileIDs;
IncludedInputFileIDs.reserve(IncludedFiles.size());

for (const FileEntry *File : IncludedFiles) {
  auto InputFileIt = InputFileIDs.find(File);
  if (InputFileIt == InputFileIDs.end())
    continue;
  IncludedInputFileIDs.push_back(InputFileIt->second);
}

llvm::sort(IncludedInputFileIDs);

endian::Writer LE(Out, little);
LE.write<uint32_t>(IncludedInputFileIDs.size());
for (uint32_t ID : IncludedInputFileIDs)
  LE.write<uint32_t>(ID);
2282}

2284/// Writes the block containing the serialized form of the
2285/// preprocessor.
2286void ASTWriter::WritePreprocessor(const Preprocessor &PP, bool IsModule) {
uint64_t MacroOffsetsBase = Stream.GetCurrentBitNo();

PreprocessingRecord *PPRec = PP.getPreprocessingRecord();
if (PPRec)
  WritePreprocessorDetail(*PPRec, MacroOffsetsBase);

RecordData Record;
RecordData ModuleMacroRecord;

// If the preprocessor __COUNTER__ value has been bumped, remember it.
if (PP.getCounterValue() != 0) {
  RecordData::value_type Record[] = {PP.getCounterValue()};
  Stream.EmitRecord(PP_COUNTER_VALUE, Record);
}

// If we have a recorded #pragma assume_nonnull, remember it so it can be
// replayed when the preamble terminates into the main file.
SourceLocation AssumeNonNullLoc =
    PP.getPreambleRecordedPragmaAssumeNonNullLoc();
if (AssumeNonNullLoc.isValid()) {
  assert(PP.isRecordingPreamble())(static_cast <bool> (PP.isRecordingPreamble()) ? void (
0) : __assert_fail ("PP.isRecordingPreamble()", "clang/lib/Serialization/ASTWriter.cpp"
, 2307, __extension__ __PRETTY_FUNCTION__));
  AddSourceLocation(AssumeNonNullLoc, Record);
  Stream.EmitRecord(PP_ASSUME_NONNULL_LOC, Record);
  Record.clear();
}

if (PP.isRecordingPreamble() && PP.hasRecordedPreamble()) {
  assert(!IsModule)(static_cast <bool> (!IsModule) ? void (0) : __assert_fail
 ("!IsModule", "clang/lib/Serialization/ASTWriter.cpp", 2314,
 __extension__ __PRETTY_FUNCTION__));
  auto SkipInfo = PP.getPreambleSkipInfo();
  if (SkipInfo) {
    Record.push_back(true);
    AddSourceLocation(SkipInfo->HashTokenLoc, Record);
    AddSourceLocation(SkipInfo->IfTokenLoc, Record);
    Record.push_back(SkipInfo->FoundNonSkipPortion);
    Record.push_back(SkipInfo->FoundElse);
    AddSourceLocation(SkipInfo->ElseLoc, Record);
  } else {
    Record.push_back(false);
  }
  for (const auto &Cond : PP.getPreambleConditionalStack()) {
    AddSourceLocation(Cond.IfLoc, Record);
    Record.push_back(Cond.WasSkipping);
    Record.push_back(Cond.FoundNonSkip);
    Record.push_back(Cond.FoundElse);
  }
  Stream.EmitRecord(PP_CONDITIONAL_STACK, Record);
  Record.clear();
}

// Enter the preprocessor block.
Stream.EnterSubblock(PREPROCESSOR_BLOCK_ID, 3);

// If the AST file contains __DATE__ or __TIME__ emit a warning about this.
// FIXME: Include a location for the use, and say which one was used.
if (PP.SawDateOrTime())
  PP.Diag(SourceLocation(), diag::warn_module_uses_date_time) << IsModule;

// Loop over all the macro directives that are live at the end of the file,
// emitting each to the PP section.

// Construct the list of identifiers with macro directives that need to be
// serialized.
SmallVector<const IdentifierInfo *, 128> MacroIdentifiers;
// It is meaningless to emit macros for named modules. It only wastes times
// and spaces.
if (!isWritingStdCXXNamedModules())
  for (auto &Id : PP.getIdentifierTable())
    if (Id.second->hadMacroDefinition() &&
        (!Id.second->isFromAST() ||
        Id.second->hasChangedSinceDeserialization()))
      MacroIdentifiers.push_back(Id.second);
// Sort the set of macro definitions that need to be serialized by the
// name of the macro, to provide a stable ordering.
llvm::sort(MacroIdentifiers, llvm::deref<std::less<>>());

// Emit the macro directives as a list and associate the offset with the
// identifier they belong to.
for (const IdentifierInfo *Name : MacroIdentifiers) {
  MacroDirective *MD = PP.getLocalMacroDirectiveHistory(Name);
  uint64_t StartOffset = Stream.GetCurrentBitNo() - MacroOffsetsBase;
  assert((StartOffset >> 32) == 0 && "Macro identifiers offset too large")(static_cast <bool> ((StartOffset >> 32) == 0 &&
 "Macro identifiers offset too large") ? void (0) : __assert_fail
 ("(StartOffset >> 32) == 0 && \"Macro identifiers offset too large\""
, "clang/lib/Serialization/ASTWriter.cpp", 2367, __extension__
 __PRETTY_FUNCTION__));

  // Write out any exported module macros.
  bool EmittedModuleMacros = false;
  // C+=20 Header Units are compiled module interfaces, but they preserve
  // macros that are live (i.e. have a defined value) at the end of the
  // compilation.  So when writing a header unit, we preserve only the final
  // value of each macro (and discard any that are undefined).  Header units
  // do not have sub-modules (although they might import other header units).
  // PCH files, conversely, retain the history of each macro's define/undef
  // and of leaf macros in sub modules.
  if (IsModule && WritingModule->isHeaderUnit()) {
    // This is for the main TU when it is a C++20 header unit.
    // We preserve the final state of defined macros, and we do not emit ones
    // that are undefined.
    if (!MD || shouldIgnoreMacro(MD, IsModule, PP) ||
        MD->getKind() == MacroDirective::MD_Undefine)
      continue;
    AddSourceLocation(MD->getLocation(), Record);
    Record.push_back(MD->getKind());
    if (auto *DefMD = dyn_cast<DefMacroDirective>(MD)) {
      Record.push_back(getMacroRef(DefMD->getInfo(), Name));
    } else if (auto *VisMD = dyn_cast<VisibilityMacroDirective>(MD)) {
      Record.push_back(VisMD->isPublic());
    }
    ModuleMacroRecord.push_back(getSubmoduleID(WritingModule));
    ModuleMacroRecord.push_back(getMacroRef(MD->getMacroInfo(), Name));
    Stream.EmitRecord(PP_MODULE_MACRO, ModuleMacroRecord);
    ModuleMacroRecord.clear();
    EmittedModuleMacros = true;
  } else {
    // Emit the macro directives in reverse source order.
    for (; MD; MD = MD->getPrevious()) {
      // Once we hit an ignored macro, we're done: the rest of the chain
      // will all be ignored macros.
      if (shouldIgnoreMacro(MD, IsModule, PP))
        break;
      AddSourceLocation(MD->getLocation(), Record);
      Record.push_back(MD->getKind());
      if (auto *DefMD = dyn_cast<DefMacroDirective>(MD)) {
        Record.push_back(getMacroRef(DefMD->getInfo(), Name));
      } else if (auto *VisMD = dyn_cast<VisibilityMacroDirective>(MD)) {
        Record.push_back(VisMD->isPublic());
      }
    }

    // We write out exported module macros for PCH as well.
    auto Leafs = PP.getLeafModuleMacros(Name);
    SmallVector<ModuleMacro *, 8> Worklist(Leafs.begin(), Leafs.end());
    llvm::DenseMap<ModuleMacro *, unsigned> Visits;
    while (!Worklist.empty()) {
      auto *Macro = Worklist.pop_back_val();

      // Emit a record indicating this submodule exports this macro.
      ModuleMacroRecord.push_back(getSubmoduleID(Macro->getOwningModule()));
      ModuleMacroRecord.push_back(getMacroRef(Macro->getMacroInfo(), Name));
      for (auto *M : Macro->overrides())
        ModuleMacroRecord.push_back(getSubmoduleID(M->getOwningModule()));

      Stream.EmitRecord(PP_MODULE_MACRO, ModuleMacroRecord);
      ModuleMacroRecord.clear();

      // Enqueue overridden macros once we've visited all their ancestors.
      for (auto *M : Macro->overrides())
        if (++Visits[M] == M->getNumOverridingMacros())
          Worklist.push_back(M);

      EmittedModuleMacros = true;
    }
  }
  if (Record.empty() && !EmittedModuleMacros)
    continue;

  IdentMacroDirectivesOffsetMap[Name] = StartOffset;
  Stream.EmitRecord(PP_MACRO_DIRECTIVE_HISTORY, Record);
  Record.clear();
}

/// Offsets of each of the macros into the bitstream, indexed by
/// the local macro ID
///
/// For each identifier that is associated with a macro, this map
/// provides the offset into the bitstream where that macro is
/// defined.
std::vector<uint32_t> MacroOffsets;

for (unsigned I = 0, N = MacroInfosToEmit.size(); I != N; ++I) {
  const IdentifierInfo *Name = MacroInfosToEmit[I].Name;
  MacroInfo *MI = MacroInfosToEmit[I].MI;
  MacroID ID = MacroInfosToEmit[I].ID;

  if (ID < FirstMacroID) {
    assert(0 && "Loaded MacroInfo entered MacroInfosToEmit ?")(static_cast <bool> (0 && "Loaded MacroInfo entered MacroInfosToEmit ?"
) ? void (0) : __assert_fail ("0 && \"Loaded MacroInfo entered MacroInfosToEmit ?\""
, "clang/lib/Serialization/ASTWriter.cpp", 2459, __extension__
 __PRETTY_FUNCTION__));
    continue;
  }

  // Record the local offset of this macro.
  unsigned Index = ID - FirstMacroID;
  if (Index >= MacroOffsets.size())
    MacroOffsets.resize(Index + 1);

  uint64_t Offset = Stream.GetCurrentBitNo() - MacroOffsetsBase;
  assert((Offset >> 32) == 0 && "Macro offset too large")(static_cast <bool> ((Offset >> 32) == 0 &&
 "Macro offset too large") ? void (0) : __assert_fail ("(Offset >> 32) == 0 && \"Macro offset too large\""
, "clang/lib/Serialization/ASTWriter.cpp", 2469, __extension__
 __PRETTY_FUNCTION__));
  MacroOffsets[Index] = Offset;

  AddIdentifierRef(Name, Record);
  AddSourceLocation(MI->getDefinitionLoc(), Record);
  AddSourceLocation(MI->getDefinitionEndLoc(), Record);
  Record.push_back(MI->isUsed());
  Record.push_back(MI->isUsedForHeaderGuard());
  Record.push_back(MI->getNumTokens());
  unsigned Code;
  if (MI->isObjectLike()) {
    Code = PP_MACRO_OBJECT_LIKE;
  } else {
    Code = PP_MACRO_FUNCTION_LIKE;

    Record.push_back(MI->isC99Varargs());
    Record.push_back(MI->isGNUVarargs());
    Record.push_back(MI->hasCommaPasting());
    Record.push_back(MI->getNumParams());
    for (const IdentifierInfo *Param : MI->params())
      AddIdentifierRef(Param, Record);
  }

  // If we have a detailed preprocessing record, record the macro definition
  // ID that corresponds to this macro.
  if (PPRec)
    Record.push_back(MacroDefinitions[PPRec->findMacroDefinition(MI)]);

  Stream.EmitRecord(Code, Record);
  Record.clear();

  // Emit the tokens array.
  for (unsigned TokNo = 0, e = MI->getNumTokens(); TokNo != e; ++TokNo) {
    // Note that we know that the preprocessor does not have any annotation
    // tokens in it because they are created by the parser, and thus can't
    // be in a macro definition.
    const Token &Tok = MI->getReplacementToken(TokNo);
    AddToken(Tok, Record);
    Stream.EmitRecord(PP_TOKEN, Record);
    Record.clear();
  }
  ++NumMacros;
}

Stream.ExitBlock();

// Write the offsets table for macro IDs.
using namespace llvm;

auto Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(MACRO_OFFSET));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // # of macros
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // first ID
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 32));   // base offset
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));

unsigned MacroOffsetAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
{
  RecordData::value_type Record[] = {MACRO_OFFSET, MacroOffsets.size(),
                                     FirstMacroID - NUM_PREDEF_MACRO_IDS,
                                     MacroOffsetsBase - ASTBlockStartOffset};
  Stream.EmitRecordWithBlob(MacroOffsetAbbrev, Record, bytes(MacroOffsets));
}

{
  auto Abbrev = std::make_shared<BitCodeAbbrev>();
  Abbrev->Add(BitCodeAbbrevOp(PP_INCLUDED_FILES));
  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
  unsigned IncludedFilesAbbrev = Stream.EmitAbbrev(std::move(Abbrev));

  SmallString<2048> Buffer;
  raw_svector_ostream Out(Buffer);
  writeIncludedFiles(Out, PP);
  RecordData::value_type Record[] = {PP_INCLUDED_FILES};
  Stream.EmitRecordWithBlob(IncludedFilesAbbrev, Record, Buffer.data(),
                            Buffer.size());
}
2546}

2548void ASTWriter::WritePreprocessorDetail(PreprocessingRecord &PPRec,
                                      uint64_t MacroOffsetsBase) {
if (PPRec.local_begin() == PPRec.local_end())
  return;

SmallVector<PPEntityOffset, 64> PreprocessedEntityOffsets;

// Enter the preprocessor block.
Stream.EnterSubblock(PREPROCESSOR_DETAIL_BLOCK_ID, 3);

// If the preprocessor has a preprocessing record, emit it.
unsigned NumPreprocessingRecords = 0;
using namespace llvm;

// Set up the abbreviation for
unsigned InclusionAbbrev = 0;
{
  auto Abbrev = std::make_shared<BitCodeAbbrev>();
  Abbrev->Add(BitCodeAbbrevOp(PPD_INCLUSION_DIRECTIVE));
  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // filename length
  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // in quotes
  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // kind
  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // imported module
  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
  InclusionAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
}

unsigned FirstPreprocessorEntityID
  = (Chain ? PPRec.getNumLoadedPreprocessedEntities() : 0)
  + NUM_PREDEF_PP_ENTITY_IDS;
unsigned NextPreprocessorEntityID = FirstPreprocessorEntityID;
RecordData Record;
for (PreprocessingRecord::iterator E = PPRec.local_begin(),
                                EEnd = PPRec.local_end();
     E != EEnd;
     (void)++E, ++NumPreprocessingRecords, ++NextPreprocessorEntityID) {
  Record.clear();

  uint64_t Offset = Stream.GetCurrentBitNo() - MacroOffsetsBase;
  assert((Offset >> 32) == 0 && "Preprocessed entity offset too large")(static_cast <bool> ((Offset >> 32) == 0 &&
 "Preprocessed entity offset too large") ? void (0) : __assert_fail
 ("(Offset >> 32) == 0 && \"Preprocessed entity offset too large\""
, "clang/lib/Serialization/ASTWriter.cpp", 2587, __extension__
 __PRETTY_FUNCTION__));
  PreprocessedEntityOffsets.push_back(
      PPEntityOffset(getAdjustedRange((*E)->getSourceRange()), Offset));

  if (auto *MD = dyn_cast<MacroDefinitionRecord>(*E)) {
    // Record this macro definition's ID.
    MacroDefinitions[MD] = NextPreprocessorEntityID;

    AddIdentifierRef(MD->getName(), Record);
    Stream.EmitRecord(PPD_MACRO_DEFINITION, Record);
    continue;
  }

  if (auto *ME = dyn_cast<MacroExpansion>(*E)) {
    Record.push_back(ME->isBuiltinMacro());
    if (ME->isBuiltinMacro())
      AddIdentifierRef(ME->getName(), Record);
    else
      Record.push_back(MacroDefinitions[ME->getDefinition()]);
    Stream.EmitRecord(PPD_MACRO_EXPANSION, Record);
    continue;
  }

  if (auto *ID = dyn_cast<InclusionDirective>(*E)) {
    Record.push_back(PPD_INCLUSION_DIRECTIVE);
    Record.push_back(ID->getFileName().size());
    Record.push_back(ID->wasInQuotes());
    Record.push_back(static_cast<unsigned>(ID->getKind()));
    Record.push_back(ID->importedModule());
    SmallString<64> Buffer;
    Buffer += ID->getFileName();
    // Check that the FileEntry is not null because it was not resolved and
    // we create a PCH even with compiler errors.
    if (ID->getFile())
      Buffer += ID->getFile()->getName();
    Stream.EmitRecordWithBlob(InclusionAbbrev, Record, Buffer);
    continue;
  }

  llvm_unreachable("Unhandled PreprocessedEntity in ASTWriter")::llvm::llvm_unreachable_internal("Unhandled PreprocessedEntity in ASTWriter"
, "clang/lib/Serialization/ASTWriter.cpp", 2626);
}
Stream.ExitBlock();

// Write the offsets table for the preprocessing record.
if (NumPreprocessingRecords > 0) {
  assert(PreprocessedEntityOffsets.size() == NumPreprocessingRecords)(static_cast <bool> (PreprocessedEntityOffsets.size() ==
 NumPreprocessingRecords) ? void (0) : __assert_fail ("PreprocessedEntityOffsets.size() == NumPreprocessingRecords"
, "clang/lib/Serialization/ASTWriter.cpp", 2632, __extension__
 __PRETTY_FUNCTION__));

  // Write the offsets table for identifier IDs.
  using namespace llvm;

  auto Abbrev = std::make_shared<BitCodeAbbrev>();
  Abbrev->Add(BitCodeAbbrevOp(PPD_ENTITIES_OFFSETS));
  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // first pp entity
  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
  unsigned PPEOffsetAbbrev = Stream.EmitAbbrev(std::move(Abbrev));

  RecordData::value_type Record[] = {PPD_ENTITIES_OFFSETS,
                                     FirstPreprocessorEntityID -
                                         NUM_PREDEF_PP_ENTITY_IDS};
  Stream.EmitRecordWithBlob(PPEOffsetAbbrev, Record,
                            bytes(PreprocessedEntityOffsets));
}

// Write the skipped region table for the preprocessing record.
ArrayRef<SourceRange> SkippedRanges = PPRec.getSkippedRanges();
if (SkippedRanges.size() > 0) {
  std::vector<PPSkippedRange> SerializedSkippedRanges;
  SerializedSkippedRanges.reserve(SkippedRanges.size());
  for (auto const& Range : SkippedRanges)
    SerializedSkippedRanges.emplace_back(Range);

  using namespace llvm;
  auto Abbrev = std::make_shared<BitCodeAbbrev>();
  Abbrev->Add(BitCodeAbbrevOp(PPD_SKIPPED_RANGES));
  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
  unsigned PPESkippedRangeAbbrev = Stream.EmitAbbrev(std::move(Abbrev));

  Record.clear();
  Record.push_back(PPD_SKIPPED_RANGES);
  Stream.EmitRecordWithBlob(PPESkippedRangeAbbrev, Record,
                            bytes(SerializedSkippedRanges));
}
2669}

2671unsigned ASTWriter::getLocalOrImportedSubmoduleID(const Module *Mod) {
if (!Mod)
  return 0;

auto Known = SubmoduleIDs.find(Mod);
if (Known != SubmoduleIDs.end())
  return Known->second;

auto *Top = Mod->getTopLevelModule();
if (Top != WritingModule &&
    (getLangOpts().CompilingPCH ||
     !Top->fullModuleNameIs(StringRef(getLangOpts().CurrentModule))))
  return 0;

return SubmoduleIDs[Mod] = NextSubmoduleID++;
2686}

2688unsigned ASTWriter::getSubmoduleID(Module *Mod) {
unsigned ID = getLocalOrImportedSubmoduleID(Mod);
// FIXME: This can easily happen, if we have a reference to a submodule that
// did not result in us loading a module file for that submodule. For
// instance, a cross-top-level-module 'conflict' declaration will hit this.
// assert((ID || !Mod) &&
//        "asked for module ID for non-local, non-imported module");
return ID;
2696}

2698/// Compute the number of modules within the given tree (including the
2699/// given module).
2700static unsigned getNumberOfModules(Module *Mod) {
unsigned ChildModules = 0;
for (auto Sub = Mod->submodule_begin(), SubEnd = Mod->submodule_end();
     Sub != SubEnd; ++Sub)
  ChildModules += getNumberOfModules(*Sub);

return ChildModules + 1;
2707}

2709void ASTWriter::WriteSubmodules(Module *WritingModule) {
// Enter the submodule description block.
Stream.EnterSubblock(SUBMODULE_BLOCK_ID, /*bits for abbreviations*/5);

// Write the abbreviations needed for the submodules block.
using namespace llvm;

auto Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_DEFINITION));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ID
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Parent
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Kind
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFramework
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsExplicit
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsSystem
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsExternC
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InferSubmodules...
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InferExplicit...
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InferExportWild...
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ConfigMacrosExh...
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ModuleMapIsPriv...
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
unsigned DefinitionAbbrev = Stream.EmitAbbrev(std::move(Abbrev));

Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_UMBRELLA_HEADER));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
unsigned UmbrellaAbbrev = Stream.EmitAbbrev(std::move(Abbrev));

Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_HEADER));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
unsigned HeaderAbbrev = Stream.EmitAbbrev(std::move(Abbrev));

Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_TOPHEADER));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
unsigned TopHeaderAbbrev = Stream.EmitAbbrev(std::move(Abbrev));

Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_UMBRELLA_DIR));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
unsigned UmbrellaDirAbbrev = Stream.EmitAbbrev(std::move(Abbrev));

Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_REQUIRES));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // State
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));     // Feature
unsigned RequiresAbbrev = Stream.EmitAbbrev(std::move(Abbrev));

Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_EXCLUDED_HEADER));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
unsigned ExcludedHeaderAbbrev = Stream.EmitAbbrev(std::move(Abbrev));

Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_TEXTUAL_HEADER));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
unsigned TextualHeaderAbbrev = Stream.EmitAbbrev(std::move(Abbrev));

Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_PRIVATE_HEADER));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
unsigned PrivateHeaderAbbrev = Stream.EmitAbbrev(std::move(Abbrev));

Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_PRIVATE_TEXTUAL_HEADER));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
unsigned PrivateTextualHeaderAbbrev = Stream.EmitAbbrev(std::move(Abbrev));

Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_LINK_LIBRARY));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFramework
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));     // Name
unsigned LinkLibraryAbbrev = Stream.EmitAbbrev(std::move(Abbrev));

Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_CONFIG_MACRO));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));    // Macro name
unsigned ConfigMacroAbbrev = Stream.EmitAbbrev(std::move(Abbrev));

Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_CONFLICT));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));  // Other module
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));    // Message
unsigned ConflictAbbrev = Stream.EmitAbbrev(std::move(Abbrev));

Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_EXPORT_AS));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));    // Macro name
unsigned ExportAsAbbrev = Stream.EmitAbbrev(std::move(Abbrev));

// Write the submodule metadata block.
RecordData::value_type Record[] = {
    getNumberOfModules(WritingModule),
    FirstSubmoduleID - NUM_PREDEF_SUBMODULE_IDS};
Stream.EmitRecord(SUBMODULE_METADATA, Record);

// Write all of the submodules.
std::queue<Module *> Q;
Q.push(WritingModule);
while (!Q.empty()) {
  Module *Mod = Q.front();
  Q.pop();
  unsigned ID = getSubmoduleID(Mod);

  uint64_t ParentID = 0;
  if (Mod->Parent) {
    assert(SubmoduleIDs[Mod->Parent] && "Submodule parent not written?")(static_cast <bool> (SubmoduleIDs[Mod->Parent] &&
 "Submodule parent not written?") ? void (0) : __assert_fail (
"SubmoduleIDs[Mod->Parent] && \"Submodule parent not written?\""
, "clang/lib/Serialization/ASTWriter.cpp", 2817, __extension__
 __PRETTY_FUNCTION__));
    ParentID = SubmoduleIDs[Mod->Parent];
  }

  // Emit the definition of the block.
  {
    RecordData::value_type Record[] = {SUBMODULE_DEFINITION,
                                       ID,
                                       ParentID,
                                       (RecordData::value_type)Mod->Kind,
                                       Mod->IsFramework,
                                       Mod->IsExplicit,
                                       Mod->IsSystem,
                                       Mod->IsExternC,
                                       Mod->InferSubmodules,
                                       Mod->InferExplicitSubmodules,
                                       Mod->InferExportWildcard,
                                       Mod->ConfigMacrosExhaustive,
                                       Mod->ModuleMapIsPrivate};
    Stream.EmitRecordWithBlob(DefinitionAbbrev, Record, Mod->Name);
  }

  // Emit the requirements.
  for (const auto &R : Mod->Requirements) {
    RecordData::value_type Record[] = {SUBMODULE_REQUIRES, R.second};
    Stream.EmitRecordWithBlob(RequiresAbbrev, Record, R.first);
  }

  // Emit the umbrella header, if there is one.
  if (auto UmbrellaHeader = Mod->getUmbrellaHeader()) {
    RecordData::value_type Record[] = {SUBMODULE_UMBRELLA_HEADER};
    Stream.EmitRecordWithBlob(UmbrellaAbbrev, Record,
                              UmbrellaHeader.NameAsWritten);
  } else if (auto UmbrellaDir = Mod->getUmbrellaDir()) {
    RecordData::value_type Record[] = {SUBMODULE_UMBRELLA_DIR};
    Stream.EmitRecordWithBlob(UmbrellaDirAbbrev, Record,
                              UmbrellaDir.NameAsWritten);
  }

  // Emit the headers.
  struct {
    unsigned RecordKind;
    unsigned Abbrev;
    Module::HeaderKind HeaderKind;
  } HeaderLists[] = {
    {SUBMODULE_HEADER, HeaderAbbrev, Module::HK_Normal},
    {SUBMODULE_TEXTUAL_HEADER, TextualHeaderAbbrev, Module::HK_Textual},
    {SUBMODULE_PRIVATE_HEADER, PrivateHeaderAbbrev, Module::HK_Private},
    {SUBMODULE_PRIVATE_TEXTUAL_HEADER, PrivateTextualHeaderAbbrev,
      Module::HK_PrivateTextual},
    {SUBMODULE_EXCLUDED_HEADER, ExcludedHeaderAbbrev, Module::HK_Excluded}
  };
  for (auto &HL : HeaderLists) {
    RecordData::value_type Record[] = {HL.RecordKind};
    for (auto &H : Mod->Headers[HL.HeaderKind])
      Stream.EmitRecordWithBlob(HL.Abbrev, Record, H.NameAsWritten);
  }

  // Emit the top headers.
  {
    auto TopHeaders = Mod->getTopHeaders(PP->getFileManager());
    RecordData::value_type Record[] = {SUBMODULE_TOPHEADER};
    for (auto *H : TopHeaders) {
      SmallString<128> HeaderName(H->getName());
      PreparePathForOutput(HeaderName);
      Stream.EmitRecordWithBlob(TopHeaderAbbrev, Record, HeaderName);
    }
  }

  // Emit the imports.
  if (!Mod->Imports.empty()) {
    RecordData Record;
    for (auto *I : Mod->Imports)
      Record.push_back(getSubmoduleID(I));
    Stream.EmitRecord(SUBMODULE_IMPORTS, Record);
  }

  // Emit the modules affecting compilation that were not imported.
  if (!Mod->AffectingClangModules.empty()) {
    RecordData Record;
    for (auto *I : Mod->AffectingClangModules)
      Record.push_back(getSubmoduleID(I));
    Stream.EmitRecord(SUBMODULE_AFFECTING_MODULES, Record);
  }

  // Emit the exports.
  if (!Mod->Exports.empty()) {
    RecordData Record;
    for (const auto &E : Mod->Exports) {
      // FIXME: This may fail; we don't require that all exported modules
      // are local or imported.
      Record.push_back(getSubmoduleID(E.getPointer()));
      Record.push_back(E.getInt());
    }
    Stream.EmitRecord(SUBMODULE_EXPORTS, Record);
  }

  //FIXME: How do we emit the 'use'd modules?  They may not be submodules.
  // Might be unnecessary as use declarations are only used to build the
  // module itself.

  // TODO: Consider serializing undeclared uses of modules.

  // Emit the link libraries.
  for (const auto &LL : Mod->LinkLibraries) {
    RecordData::value_type Record[] = {SUBMODULE_LINK_LIBRARY,
                                       LL.IsFramework};
    Stream.EmitRecordWithBlob(LinkLibraryAbbrev, Record, LL.Library);
  }

  // Emit the conflicts.
  for (const auto &C : Mod->Conflicts) {
    // FIXME: This may fail; we don't require that all conflicting modules
    // are local or imported.
    RecordData::value_type Record[] = {SUBMODULE_CONFLICT,
                                       getSubmoduleID(C.Other)};
    Stream.EmitRecordWithBlob(ConflictAbbrev, Record, C.Message);
  }

  // Emit the configuration macros.
  for (const auto &CM : Mod->ConfigMacros) {
    RecordData::value_type Record[] = {SUBMODULE_CONFIG_MACRO};
    Stream.EmitRecordWithBlob(ConfigMacroAbbrev, Record, CM);
  }

  // Emit the initializers, if any.
  RecordData Inits;
  for (Decl *D : Context->getModuleInitializers(Mod))
    Inits.push_back(GetDeclRef(D));
  if (!Inits.empty())
    Stream.EmitRecord(SUBMODULE_INITIALIZERS, Inits);

  // Emit the name of the re-exported module, if any.
  if (!Mod->ExportAsModule.empty()) {
    RecordData::value_type Record[] = {SUBMODULE_EXPORT_AS};
    Stream.EmitRecordWithBlob(ExportAsAbbrev, Record, Mod->ExportAsModule);
  }

  // Queue up the submodules of this module.
  for (auto *M : Mod->submodules())
    Q.push(M);
}

Stream.ExitBlock();

assert((NextSubmoduleID - FirstSubmoduleID ==(static_cast <bool> ((NextSubmoduleID - FirstSubmoduleID
 == getNumberOfModules(WritingModule)) && "Wrong # of submodules; found a reference to a non-local, "
 "non-imported submodule?") ? void (0) : __assert_fail ("(NextSubmoduleID - FirstSubmoduleID == getNumberOfModules(WritingModule)) && \"Wrong # of submodules; found a reference to a non-local, \" \"non-imported submodule?\""
, "clang/lib/Serialization/ASTWriter.cpp", 2965, __extension__
 __PRETTY_FUNCTION__))
        getNumberOfModules(WritingModule)) &&(static_cast <bool> ((NextSubmoduleID - FirstSubmoduleID
 == getNumberOfModules(WritingModule)) && "Wrong # of submodules; found a reference to a non-local, "
 "non-imported submodule?") ? void (0) : __assert_fail ("(NextSubmoduleID - FirstSubmoduleID == getNumberOfModules(WritingModule)) && \"Wrong # of submodules; found a reference to a non-local, \" \"non-imported submodule?\""
, "clang/lib/Serialization/ASTWriter.cpp", 2965, __extension__
 __PRETTY_FUNCTION__))
       "Wrong # of submodules; found a reference to a non-local, "(static_cast <bool> ((NextSubmoduleID - FirstSubmoduleID
 == getNumberOfModules(WritingModule)) && "Wrong # of submodules; found a reference to a non-local, "
 "non-imported submodule?") ? void (0) : __assert_fail ("(NextSubmoduleID - FirstSubmoduleID == getNumberOfModules(WritingModule)) && \"Wrong # of submodules; found a reference to a non-local, \" \"non-imported submodule?\""
, "clang/lib/Serialization/ASTWriter.cpp", 2965, __extension__
 __PRETTY_FUNCTION__))
       "non-imported submodule?")(static_cast <bool> ((NextSubmoduleID - FirstSubmoduleID
 == getNumberOfModules(WritingModule)) && "Wrong # of submodules; found a reference to a non-local, "
 "non-imported submodule?") ? void (0) : __assert_fail ("(NextSubmoduleID - FirstSubmoduleID == getNumberOfModules(WritingModule)) && \"Wrong # of submodules; found a reference to a non-local, \" \"non-imported submodule?\""
, "clang/lib/Serialization/ASTWriter.cpp", 2965, __extension__
 __PRETTY_FUNCTION__));
2966}

2968void ASTWriter::WritePragmaDiagnosticMappings(const DiagnosticsEngine &Diag,
                                            bool isModule) {
llvm::SmallDenseMap<const DiagnosticsEngine::DiagState *, unsigned, 64>
    DiagStateIDMap;
unsigned CurrID = 0;
RecordData Record;

auto EncodeDiagStateFlags =
    [](const DiagnosticsEngine::DiagState *DS) -> unsigned {
  unsigned Result = (unsigned)DS->ExtBehavior;
  for (unsigned Val :
       {(unsigned)DS->IgnoreAllWarnings, (unsigned)DS->EnableAllWarnings,
        (unsigned)DS->WarningsAsErrors, (unsigned)DS->ErrorsAsFatal,
        (unsigned)DS->SuppressSystemWarnings})
    Result = (Result << 1) | Val;
  return Result;
};

unsigned Flags = EncodeDiagStateFlags(Diag.DiagStatesByLoc.FirstDiagState);
Record.push_back(Flags);

auto AddDiagState = [&](const DiagnosticsEngine::DiagState *State,
                        bool IncludeNonPragmaStates) {
  // Ensure that the diagnostic state wasn't modified since it was created.
  // We will not correctly round-trip this information otherwise.
  assert(Flags == EncodeDiagStateFlags(State) &&(static_cast <bool> (Flags == EncodeDiagStateFlags(State
) && "diag state flags vary in single AST file") ? void
 (0) : __assert_fail ("Flags == EncodeDiagStateFlags(State) && \"diag state flags vary in single AST file\""
, "clang/lib/Serialization/ASTWriter.cpp", 2994, __extension__
 __PRETTY_FUNCTION__))
         "diag state flags vary in single AST file")(static_cast <bool> (Flags == EncodeDiagStateFlags(State
) && "diag state flags vary in single AST file") ? void
 (0) : __assert_fail ("Flags == EncodeDiagStateFlags(State) && \"diag state flags vary in single AST file\""
, "clang/lib/Serialization/ASTWriter.cpp", 2994, __extension__
 __PRETTY_FUNCTION__));

  unsigned &DiagStateID = DiagStateIDMap[State];
  Record.push_back(DiagStateID);

  if (DiagStateID == 0) {
    DiagStateID = ++CurrID;

    // Add a placeholder for the number of mappings.
    auto SizeIdx = Record.size();
    Record.emplace_back();
    for (const auto &I : *State) {
      if (I.second.isPragma() || IncludeNonPragmaStates) {
        Record.push_back(I.first);
        Record.push_back(I.second.serialize());
      }
    }
    // Update the placeholder.
    Record[SizeIdx] = (Record.size() - SizeIdx) / 2;
  }
};

AddDiagState(Diag.DiagStatesByLoc.FirstDiagState, isModule);

// Reserve a spot for the number of locations with state transitions.
auto NumLocationsIdx = Record.size();
Record.emplace_back();

// Emit the state transitions.
unsigned NumLocations = 0;
for (auto &FileIDAndFile : Diag.DiagStatesByLoc.Files) {
  if (!FileIDAndFile.first.isValid() ||
      !FileIDAndFile.second.HasLocalTransitions)
    continue;
  ++NumLocations;

  SourceLocation Loc = Diag.SourceMgr->getComposedLoc(FileIDAndFile.first, 0);
  assert(!Loc.isInvalid() && "start loc for valid FileID is invalid")(static_cast <bool> (!Loc.isInvalid() && "start loc for valid FileID is invalid"
) ? void (0) : __assert_fail ("!Loc.isInvalid() && \"start loc for valid FileID is invalid\""
, "clang/lib/Serialization/ASTWriter.cpp", 3031, __extension__
 __PRETTY_FUNCTION__));
  AddSourceLocation(Loc, Record);

  Record.push_back(FileIDAndFile.second.StateTransitions.size());
  for (auto &StatePoint : FileIDAndFile.second.StateTransitions) {
    Record.push_back(getAdjustedOffset(StatePoint.Offset));
    AddDiagState(StatePoint.State, false);
  }
}

// Backpatch the number of locations.
Record[NumLocationsIdx] = NumLocations;

// Emit CurDiagStateLoc.  Do it last in order to match source order.
//
// This also protects against a hypothetical corner case with simulating
// -Werror settings for implicit modules in the ASTReader, where reading
// CurDiagState out of context could change whether warning pragmas are
// treated as errors.
AddSourceLocation(Diag.DiagStatesByLoc.CurDiagStateLoc, Record);
AddDiagState(Diag.DiagStatesByLoc.CurDiagState, false);

Stream.EmitRecord(DIAG_PRAGMA_MAPPINGS, Record);
3054}

3056//===----------------------------------------------------------------------===//
3057// Type Serialization
3058//===----------------------------------------------------------------------===//

3060/// Write the representation of a type to the AST stream.
3061void ASTWriter::WriteType(QualType T) {
TypeIdx &IdxRef = TypeIdxs[T];
if (IdxRef.getIndex() == 0) // we haven't seen this type before.
  IdxRef = TypeIdx(NextTypeID++);
TypeIdx Idx = IdxRef;

assert(Idx.getIndex() >= FirstTypeID && "Re-writing a type from a prior AST")(static_cast <bool> (Idx.getIndex() >= FirstTypeID &&
 "Re-writing a type from a prior AST") ? void (0) : __assert_fail
 ("Idx.getIndex() >= FirstTypeID && \"Re-writing a type from a prior AST\""
, "clang/lib/Serialization/ASTWriter.cpp", 3067, __extension__
 __PRETTY_FUNCTION__));

// Emit the type's representation.
uint64_t Offset = ASTTypeWriter(*this).write(T) - DeclTypesBlockStartOffset;

// Record the offset for this type.
unsigned Index = Idx.getIndex() - FirstTypeID;
if (TypeOffsets.size() == Index)
  TypeOffsets.emplace_back(Offset);
else if (TypeOffsets.size() < Index) {
  TypeOffsets.resize(Index + 1);
  TypeOffsets[Index].setBitOffset(Offset);
} else {
  llvm_unreachable("Types emitted in wrong order")::llvm::llvm_unreachable_internal("Types emitted in wrong order"
, "clang/lib/Serialization/ASTWriter.cpp", 3080);
}
3082}

3084//===----------------------------------------------------------------------===//
3085// Declaration Serialization
3086//===----------------------------------------------------------------------===//

3088/// Write the block containing all of the declaration IDs
3089/// lexically declared within the given DeclContext.
3090///
3091/// \returns the offset of the DECL_CONTEXT_LEXICAL block within the
3092/// bitstream, or 0 if no block was written.
3093uint64_t ASTWriter::WriteDeclContextLexicalBlock(ASTContext &Context,
                                               DeclContext *DC) {
if (DC->decls_empty())
  return 0;

uint64_t Offset = Stream.GetCurrentBitNo();
SmallVector<uint32_t, 128> KindDeclPairs;
for (const auto *D : DC->decls()) {
  KindDeclPairs.push_back(D->getKind());
  KindDeclPairs.push_back(GetDeclRef(D));
}

++NumLexicalDeclContexts;
RecordData::value_type Record[] = {DECL_CONTEXT_LEXICAL};
Stream.EmitRecordWithBlob(DeclContextLexicalAbbrev, Record,
                          bytes(KindDeclPairs));
return Offset;
3110}

3112void ASTWriter::WriteTypeDeclOffsets() {
using namespace llvm;

// Write the type offsets array
auto Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(TYPE_OFFSET));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // # of types
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // base type index
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // types block
unsigned TypeOffsetAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
{
  RecordData::value_type Record[] = {TYPE_OFFSET, TypeOffsets.size(),
                                     FirstTypeID - NUM_PREDEF_TYPE_IDS};
  Stream.EmitRecordWithBlob(TypeOffsetAbbrev, Record, bytes(TypeOffsets));
}

// Write the declaration offsets array
Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(DECL_OFFSET));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // # of declarations
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // base decl ID
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // declarations block
unsigned DeclOffsetAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
{
  RecordData::value_type Record[] = {DECL_OFFSET, DeclOffsets.size(),
                                     FirstDeclID - NUM_PREDEF_DECL_IDS};
  Stream.EmitRecordWithBlob(DeclOffsetAbbrev, Record, bytes(DeclOffsets));
}
3140}

3142void ASTWriter::WriteFileDeclIDsMap() {
using namespace llvm;

SmallVector<std::pair<FileID, DeclIDInFileInfo *>, 64> SortedFileDeclIDs;
SortedFileDeclIDs.reserve(FileDeclIDs.size());
for (const auto &P : FileDeclIDs)
  SortedFileDeclIDs.push_back(std::make_pair(P.first, P.second.get()));
llvm::sort(SortedFileDeclIDs, llvm::less_first());

// Join the vectors of DeclIDs from all files.
SmallVector<DeclID, 256> FileGroupedDeclIDs;
for (auto &FileDeclEntry : SortedFileDeclIDs) {
  DeclIDInFileInfo &Info = *FileDeclEntry.second;
  Info.FirstDeclIndex = FileGroupedDeclIDs.size();
  llvm::stable_sort(Info.DeclIDs);
  for (auto &LocDeclEntry : Info.DeclIDs)
    FileGroupedDeclIDs.push_back(LocDeclEntry.second);
}

auto Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(FILE_SORTED_DECLS));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
unsigned AbbrevCode = Stream.EmitAbbrev(std::move(Abbrev));
RecordData::value_type Record[] = {FILE_SORTED_DECLS,
                                   FileGroupedDeclIDs.size()};
Stream.EmitRecordWithBlob(AbbrevCode, Record, bytes(FileGroupedDeclIDs));
3169}

3171void ASTWriter::WriteComments() {
Stream.EnterSubblock(COMMENTS_BLOCK_ID, 3);
auto _ = llvm::make_scope_exit([this] { Stream.ExitBlock(); });
if (!PP->getPreprocessorOpts().WriteCommentListToPCH)
  return;
RecordData Record;
for (const auto &FO : Context->Comments.OrderedComments) {
  for (const auto &OC : FO.second) {
    const RawComment *I = OC.second;
    Record.clear();
    AddSourceRange(I->getSourceRange(), Record);
    Record.push_back(I->getKind());
    Record.push_back(I->isTrailingComment());
    Record.push_back(I->isAlmostTrailingComment());
    Stream.EmitRecord(COMMENTS_RAW_COMMENT, Record);
  }
}
3188}

3190//===----------------------------------------------------------------------===//
3191// Global Method Pool and Selector Serialization
3192//===----------------------------------------------------------------------===//

3194namespace {

3196// Trait used for the on-disk hash table used in the method pool.
3197class ASTMethodPoolTrait {
ASTWriter &Writer;

3200public:
using key_type = Selector;
using key_type_ref = key_type;

struct data_type {
  SelectorID ID;
  ObjCMethodList Instance, Factory;
};
using data_type_ref = const data_type &;

using hash_value_type = unsigned;
using offset_type = unsigned;

explicit ASTMethodPoolTrait(ASTWriter &Writer) : Writer(Writer) {}

static hash_value_type ComputeHash(Selector Sel) {
  return serialization::ComputeHash(Sel);
}

std::pair<unsigned, unsigned>
  EmitKeyDataLength(raw_ostream& Out, Selector Sel,
                    data_type_ref Methods) {
  unsigned KeyLen = 2 + (Sel.getNumArgs()? Sel.getNumArgs() * 4 : 4);
  unsigned DataLen = 4 + 2 + 2; // 2 bytes for each of the method counts
  for (const ObjCMethodList *Method = &Methods.Instance; Method;
       Method = Method->getNext())
    if (ShouldWriteMethodListNode(Method))
      DataLen += 4;
  for (const ObjCMethodList *Method = &Methods.Factory; Method;
       Method = Method->getNext())
    if (ShouldWriteMethodListNode(Method))
      DataLen += 4;
  return emitULEBKeyDataLength(KeyLen, DataLen, Out);
}

void EmitKey(raw_ostream& Out, Selector Sel, unsigned) {
  using namespace llvm::support;

  endian::Writer LE(Out, little);
  uint64_t Start = Out.tell();
  assert((Start >> 32) == 0 && "Selector key offset too large")(static_cast <bool> ((Start >> 32) == 0 &&
 "Selector key offset too large") ? void (0) : __assert_fail (
"(Start >> 32) == 0 && \"Selector key offset too large\""
, "clang/lib/Serialization/ASTWriter.cpp", 3240, __extension__
 __PRETTY_FUNCTION__));
  Writer.SetSelectorOffset(Sel, Start);
  unsigned N = Sel.getNumArgs();
  LE.write<uint16_t>(N);
  if (N == 0)
    N = 1;
  for (unsigned I = 0; I != N; ++I)
    LE.write<uint32_t>(
        Writer.getIdentifierRef(Sel.getIdentifierInfoForSlot(I)));
}

void EmitData(raw_ostream& Out, key_type_ref,
              data_type_ref Methods, unsigned DataLen) {
  using namespace llvm::support;

  endian::Writer LE(Out, little);
  uint64_t Start = Out.tell(); (void)Start;
  LE.write<uint32_t>(Methods.ID);
  unsigned NumInstanceMethods = 0;
  for (const ObjCMethodList *Method = &Methods.Instance; Method;
       Method = Method->getNext())
    if (ShouldWriteMethodListNode(Method))
      ++NumInstanceMethods;

  unsigned NumFactoryMethods = 0;
  for (const ObjCMethodList *Method = &Methods.Factory; Method;
       Method = Method->getNext())
    if (ShouldWriteMethodListNode(Method))
      ++NumFactoryMethods;

  unsigned InstanceBits = Methods.Instance.getBits();
  assert(InstanceBits < 4)(static_cast <bool> (InstanceBits < 4) ? void (0) : __assert_fail
 ("InstanceBits < 4", "clang/lib/Serialization/ASTWriter.cpp"
, 3271, __extension__ __PRETTY_FUNCTION__));
  unsigned InstanceHasMoreThanOneDeclBit =
      Methods.Instance.hasMoreThanOneDecl();
  unsigned FullInstanceBits = (NumInstanceMethods << 3) |
                              (InstanceHasMoreThanOneDeclBit << 2) |
                              InstanceBits;
  unsigned FactoryBits = Methods.Factory.getBits();
  assert(FactoryBits < 4)(static_cast <bool> (FactoryBits < 4) ? void (0) : __assert_fail
 ("FactoryBits < 4", "clang/lib/Serialization/ASTWriter.cpp"
, 3278, __extension__ __PRETTY_FUNCTION__));
  unsigned FactoryHasMoreThanOneDeclBit =
      Methods.Factory.hasMoreThanOneDecl();
  unsigned FullFactoryBits = (NumFactoryMethods << 3) |
                             (FactoryHasMoreThanOneDeclBit << 2) |
                             FactoryBits;
  LE.write<uint16_t>(FullInstanceBits);
  LE.write<uint16_t>(FullFactoryBits);
  for (const ObjCMethodList *Method = &Methods.Instance; Method;
       Method = Method->getNext())
    if (ShouldWriteMethodListNode(Method))
      LE.write<uint32_t>(Writer.getDeclID(Method->getMethod()));
  for (const ObjCMethodList *Method = &Methods.Factory; Method;
       Method = Method->getNext())
    if (ShouldWriteMethodListNode(Method))
      LE.write<uint32_t>(Writer.getDeclID(Method->getMethod()));

  assert(Out.tell() - Start == DataLen && "Data length is wrong")(static_cast <bool> (Out.tell() - Start == DataLen &&
 "Data length is wrong") ? void (0) : __assert_fail ("Out.tell() - Start == DataLen && \"Data length is wrong\""
, "clang/lib/Serialization/ASTWriter.cpp", 3295, __extension__
 __PRETTY_FUNCTION__));
}

3298private:
static bool ShouldWriteMethodListNode(const ObjCMethodList *Node) {
  return (Node->getMethod() && !Node->getMethod()->isFromASTFile());
}
3302};

3304} // namespace

3306/// Write ObjC data: selectors and the method pool.
3307///
3308/// The method pool contains both instance and factory methods, stored
3309/// in an on-disk hash table indexed by the selector. The hash table also
3310/// contains an empty entry for every other selector known to Sema.
3311void ASTWriter::WriteSelectors(Sema &SemaRef) {
using namespace llvm;

// Do we have to do anything at all?
if (SemaRef.MethodPool.empty() && SelectorIDs.empty())
  return;
unsigned NumTableEntries = 0;
// Create and write out the blob that contains selectors and the method pool.
{
  llvm::OnDiskChainedHashTableGenerator<ASTMethodPoolTrait> Generator;
  ASTMethodPoolTrait Trait(*this);

  // Create the on-disk hash table representation. We walk through every
  // selector we've seen and look it up in the method pool.
  SelectorOffsets.resize(NextSelectorID - FirstSelectorID);
  for (auto &SelectorAndID : SelectorIDs) {
    Selector S = SelectorAndID.first;
    SelectorID ID = SelectorAndID.second;
    Sema::GlobalMethodPool::iterator F = SemaRef.MethodPool.find(S);
    ASTMethodPoolTrait::data_type Data = {
      ID,
      ObjCMethodList(),
      ObjCMethodList()
    };
    if (F != SemaRef.MethodPool.end()) {
      Data.Instance = F->second.first;
      Data.Factory = F->second.second;
    }
    // Only write this selector if it's not in an existing AST or something
    // changed.
    if (Chain && ID < FirstSelectorID) {
      // Selector already exists. Did it change?
      bool changed = false;
      for (ObjCMethodList *M = &Data.Instance; M && M->getMethod();
           M = M->getNext()) {
        if (!M->getMethod()->isFromASTFile()) {
          changed = true;
          Data.Instance = *M;
          break;
        }
      }
      for (ObjCMethodList *M = &Data.Factory; M && M->getMethod();
           M = M->getNext()) {
        if (!M->getMethod()->isFromASTFile()) {
          changed = true;
          Data.Factory = *M;
          break;
        }
      }
      if (!changed)
        continue;
    } else if (Data.Instance.getMethod() || Data.Factory.getMethod()) {
      // A new method pool entry.
      ++NumTableEntries;
    }
    Generator.insert(S, Data, Trait);
  }

  // Create the on-disk hash table in a buffer.
  SmallString<4096> MethodPool;
  uint32_t BucketOffset;
  {
    using namespace llvm::support;

    ASTMethodPoolTrait Trait(*this);
    llvm::raw_svector_ostream Out(MethodPool);
    // Make sure that no bucket is at offset 0
    endian::write<uint32_t>(Out, 0, little);
    BucketOffset = Generator.Emit(Out, Trait);
  }

  // Create a blob abbreviation
  auto Abbrev = std::make_shared<BitCodeAbbrev>();
  Abbrev->Add(BitCodeAbbrevOp(METHOD_POOL));
  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
  unsigned MethodPoolAbbrev = Stream.EmitAbbrev(std::move(Abbrev));

  // Write the method pool
  {
    RecordData::value_type Record[] = {METHOD_POOL, BucketOffset,
                                       NumTableEntries};
    Stream.EmitRecordWithBlob(MethodPoolAbbrev, Record, MethodPool);
  }

  // Create a blob abbreviation for the selector table offsets.
  Abbrev = std::make_shared<BitCodeAbbrev>();
  Abbrev->Add(BitCodeAbbrevOp(SELECTOR_OFFSETS));
  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // size
  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // first ID
  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
  unsigned SelectorOffsetAbbrev = Stream.EmitAbbrev(std::move(Abbrev));

  // Write the selector offsets table.
  {
    RecordData::value_type Record[] = {
        SELECTOR_OFFSETS, SelectorOffsets.size(),
        FirstSelectorID - NUM_PREDEF_SELECTOR_IDS};
    Stream.EmitRecordWithBlob(SelectorOffsetAbbrev, Record,
                              bytes(SelectorOffsets));
  }
}
3414}

3416/// Write the selectors referenced in @selector expression into AST file.
3417void ASTWriter::WriteReferencedSelectorsPool(Sema &SemaRef) {
using namespace llvm;

if (SemaRef.ReferencedSelectors.empty())
  return;

RecordData Record;
ASTRecordWriter Writer(*this, Record);

// Note: this writes out all references even for a dependent AST. But it is
// very tricky to fix, and given that @selector shouldn't really appear in
// headers, probably not worth it. It's not a correctness issue.
for (auto &SelectorAndLocation : SemaRef.ReferencedSelectors) {
  Selector Sel = SelectorAndLocation.first;
  SourceLocation Loc = SelectorAndLocation.second;
  Writer.AddSelectorRef(Sel);
  Writer.AddSourceLocation(Loc);
}
Writer.Emit(REFERENCED_SELECTOR_POOL);
3436}

3438//===----------------------------------------------------------------------===//
3439// Identifier Table Serialization
3440//===----------------------------------------------------------------------===//

3442/// Determine the declaration that should be put into the name lookup table to
3443/// represent the given declaration in this module. This is usually D itself,
3444/// but if D was imported and merged into a local declaration, we want the most
3445/// recent local declaration instead. The chosen declaration will be the most
3446/// recent declaration in any module that imports this one.
3447static NamedDecl *getDeclForLocalLookup(const LangOptions &LangOpts,
                                      NamedDecl *D) {
if (!LangOpts.Modules || !D->isFromASTFile())
  return D;

if (Decl *Redecl = D->getPreviousDecl()) {
  // For Redeclarable decls, a prior declaration might be local.
  for (; Redecl; Redecl = Redecl->getPreviousDecl()) {
    // If we find a local decl, we're done.
    if (!Redecl->isFromASTFile()) {
      // Exception: in very rare cases (for injected-class-names), not all
      // redeclarations are in the same semantic context. Skip ones in a
      // different context. They don't go in this lookup table at all.
      if (!Redecl->getDeclContext()->getRedeclContext()->Equals(
              D->getDeclContext()->getRedeclContext()))
        continue;
      return cast<NamedDecl>(Redecl);
    }

    // If we find a decl from a (chained-)PCH stop since we won't find a
    // local one.
    if (Redecl->getOwningModuleID() == 0)
      break;
  }
} else if (Decl *First = D->getCanonicalDecl()) {
  // For Mergeable decls, the first decl might be local.
  if (!First->isFromASTFile())
    return cast<NamedDecl>(First);
}

// All declarations are imported. Our most recent declaration will also be
// the most recent one in anyone who imports us.
return D;
3480}

3482namespace {

3484class ASTIdentifierTableTrait {
ASTWriter &Writer;
Preprocessor &PP;
IdentifierResolver &IdResolver;
bool IsModule;
bool NeedDecls;
ASTWriter::RecordData *InterestingIdentifierOffsets;

/// Determines whether this is an "interesting" identifier that needs a
/// full IdentifierInfo structure written into the hash table. Notably, this
/// doesn't check whether the name has macros defined; use PublicMacroIterator
/// to check that.
bool isInterestingIdentifier(const IdentifierInfo *II, uint64_t MacroOffset) {
  if (MacroOffset || II->isPoisoned() ||
      (!IsModule && II->getObjCOrBuiltinID()) ||
      II->hasRevertedTokenIDToIdentifier() ||
      (NeedDecls && II->getFETokenInfo()))
    return true;

  return false;
}

3506public:
using key_type = IdentifierInfo *;
using key_type_ref = key_type;

using data_type = IdentID;
using data_type_ref = data_type;

using hash_value_type = unsigned;
using offset_type = unsigned;

ASTIdentifierTableTrait(ASTWriter &Writer, Preprocessor &PP,
                        IdentifierResolver &IdResolver, bool IsModule,
                        ASTWriter::RecordData *InterestingIdentifierOffsets)
    : Writer(Writer), PP(PP), IdResolver(IdResolver), IsModule(IsModule),
      NeedDecls(!IsModule || !Writer.getLangOpts().CPlusPlus),
      InterestingIdentifierOffsets(InterestingIdentifierOffsets) {}

bool needDecls() const { return NeedDecls; }

static hash_value_type ComputeHash(const IdentifierInfo* II) {
  return llvm::djbHash(II->getName());
}

bool isInterestingIdentifier(const IdentifierInfo *II) {
  auto MacroOffset = Writer.getMacroDirectivesOffset(II);
  return isInterestingIdentifier(II, MacroOffset);
}

bool isInterestingNonMacroIdentifier(const IdentifierInfo *II) {
  return isInterestingIdentifier(II, 0);
}

std::pair<unsigned, unsigned>
EmitKeyDataLength(raw_ostream& Out, IdentifierInfo* II, IdentID ID) {
  // Record the location of the identifier data. This is used when generating
  // the mapping from persistent IDs to strings.
  Writer.SetIdentifierOffset(II, Out.tell());

  // Emit the offset of the key/data length information to the interesting
  // identifiers table if necessary.
  if (InterestingIdentifierOffsets && isInterestingIdentifier(II))
    InterestingIdentifierOffsets->push_back(Out.tell());

  unsigned KeyLen = II->getLength() + 1;
  unsigned DataLen = 4; // 4 bytes for the persistent ID << 1
  auto MacroOffset = Writer.getMacroDirectivesOffset(II);
  if (isInterestingIdentifier(II, MacroOffset)) {
    DataLen += 2; // 2 bytes for builtin ID
    DataLen += 2; // 2 bytes for flags
    if (MacroOffset)
      DataLen += 4; // MacroDirectives offset.

    if (NeedDecls) {
      for (IdentifierResolver::iterator D = IdResolver.begin(II),
                                     DEnd = IdResolver.end();
           D != DEnd; ++D)
        DataLen += 4;
    }
  }
  return emitULEBKeyDataLength(KeyLen, DataLen, Out);
}

void EmitKey(raw_ostream& Out, const IdentifierInfo* II,
             unsigned KeyLen) {
  Out.write(II->getNameStart(), KeyLen);
}

void EmitData(raw_ostream& Out, IdentifierInfo* II,
              IdentID ID, unsigned) {
  using namespace llvm::support;

  endian::Writer LE(Out, little);

  auto MacroOffset = Writer.getMacroDirectivesOffset(II);
  if (!isInterestingIdentifier(II, MacroOffset)) {
    LE.write<uint32_t>(ID << 1);
    return;
  }

  LE.write<uint32_t>((ID << 1) | 0x01);
  uint32_t Bits = (uint32_t)II->getObjCOrBuiltinID();
  assert((Bits & 0xffff) == Bits && "ObjCOrBuiltinID too big for ASTReader.")(static_cast <bool> ((Bits & 0xffff) == Bits &&
 "ObjCOrBuiltinID too big for ASTReader.") ? void (0) : __assert_fail
 ("(Bits & 0xffff) == Bits && \"ObjCOrBuiltinID too big for ASTReader.\""
, "clang/lib/Serialization/ASTWriter.cpp", 3587, __extension__
 __PRETTY_FUNCTION__));
  LE.write<uint16_t>(Bits);
  Bits = 0;
  bool HadMacroDefinition = MacroOffset != 0;
  Bits = (Bits << 1) | unsigned(HadMacroDefinition);
  Bits = (Bits << 1) | unsigned(II->isExtensionToken());
  Bits = (Bits << 1) | unsigned(II->isPoisoned());
  Bits = (Bits << 1) | unsigned(II->hasRevertedTokenIDToIdentifier());
  Bits = (Bits << 1) | unsigned(II->isCPlusPlusOperatorKeyword());
  LE.write<uint16_t>(Bits);

  if (HadMacroDefinition)
    LE.write<uint32_t>(MacroOffset);

  if (NeedDecls) {
    // Emit the declaration IDs in reverse order, because the
    // IdentifierResolver provides the declarations as they would be
    // visible (e.g., the function "stat" would come before the struct
    // "stat"), but the ASTReader adds declarations to the end of the list
    // (so we need to see the struct "stat" before the function "stat").
    // Only emit declarations that aren't from a chained PCH, though.
    SmallVector<NamedDecl *, 16> Decls(IdResolver.begin(II),
                                       IdResolver.end());
    for (NamedDecl *D : llvm::reverse(Decls))
      LE.write<uint32_t>(
          Writer.getDeclID(getDeclForLocalLookup(PP.getLangOpts(), D)));
  }
}
3615};

3617} // namespace

3619/// Write the identifier table into the AST file.
3620///
3621/// The identifier table consists of a blob containing string data
3622/// (the actual identifiers themselves) and a separate "offsets" index
3623/// that maps identifier IDs to locations within the blob.
3624void ASTWriter::WriteIdentifierTable(Preprocessor &PP,
                                   IdentifierResolver &IdResolver,
                                   bool IsModule) {
using namespace llvm;

RecordData InterestingIdents;

// Create and write out the blob that contains the identifier
// strings.
{
  llvm::OnDiskChainedHashTableGenerator<ASTIdentifierTableTrait> Generator;
  ASTIdentifierTableTrait Trait(
      *this, PP, IdResolver, IsModule,
      (getLangOpts().CPlusPlus && IsModule) ? &InterestingIdents : nullptr);

  // Look for any identifiers that were named while processing the
  // headers, but are otherwise not needed. We add these to the hash
  // table to enable checking of the predefines buffer in the case
  // where the user adds new macro definitions when building the AST
  // file.
  SmallVector<const IdentifierInfo *, 128> IIs;
  for (const auto &ID : PP.getIdentifierTable())
    IIs.push_back(ID.second);
  // Sort the identifiers lexicographically before getting them references so
  // that their order is stable.
  llvm::sort(IIs, llvm::deref<std::less<>>());
  for (const IdentifierInfo *II : IIs)
    if (Trait.isInterestingNonMacroIdentifier(II))
      getIdentifierRef(II);

  // Create the on-disk hash table representation. We only store offsets
  // for identifiers that appear here for the first time.
  IdentifierOffsets.resize(NextIdentID - FirstIdentID);
  for (auto IdentIDPair : IdentifierIDs) {
    auto *II = const_cast<IdentifierInfo *>(IdentIDPair.first);
    IdentID ID = IdentIDPair.second;
    assert(II && "NULL identifier in identifier table")(static_cast <bool> (II && "NULL identifier in identifier table"
) ? void (0) : __assert_fail ("II && \"NULL identifier in identifier table\""
, "clang/lib/Serialization/ASTWriter.cpp", 3660, __extension__
 __PRETTY_FUNCTION__));
    // Write out identifiers if either the ID is local or the identifier has
    // changed since it was loaded.
    if (ID >= FirstIdentID || !Chain || !II->isFromAST()
        || II->hasChangedSinceDeserialization() ||
        (Trait.needDecls() &&
         II->hasFETokenInfoChangedSinceDeserialization()))
      Generator.insert(II, ID, Trait);
  }

  // Create the on-disk hash table in a buffer.
  SmallString<4096> IdentifierTable;
  uint32_t BucketOffset;
  {
    using namespace llvm::support;

    llvm::raw_svector_ostream Out(IdentifierTable);
    // Make sure that no bucket is at offset 0
    endian::write<uint32_t>(Out, 0, little);
    BucketOffset = Generator.Emit(Out, Trait);
  }

  // Create a blob abbreviation
  auto Abbrev = std::make_shared<BitCodeAbbrev>();
  Abbrev->Add(BitCodeAbbrevOp(IDENTIFIER_TABLE));
  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
  unsigned IDTableAbbrev = Stream.EmitAbbrev(std::move(Abbrev));

  // Write the identifier table
  RecordData::value_type Record[] = {IDENTIFIER_TABLE, BucketOffset};
  Stream.EmitRecordWithBlob(IDTableAbbrev, Record, IdentifierTable);
}

// Write the offsets table for identifier IDs.
auto Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(IDENTIFIER_OFFSET));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // # of identifiers
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // first ID
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
unsigned IdentifierOffsetAbbrev = Stream.EmitAbbrev(std::move(Abbrev));

3702#ifndef NDEBUG
for (unsigned I = 0, N = IdentifierOffsets.size(); I != N; ++I)
  assert(IdentifierOffsets[I] && "Missing identifier offset?")(static_cast <bool> (IdentifierOffsets[I] && "Missing identifier offset?"
) ? void (0) : __assert_fail ("IdentifierOffsets[I] && \"Missing identifier offset?\""
, "clang/lib/Serialization/ASTWriter.cpp", 3704, __extension__
 __PRETTY_FUNCTION__));
3705#endif

RecordData::value_type Record[] = {IDENTIFIER_OFFSET,
                                   IdentifierOffsets.size(),
                                   FirstIdentID - NUM_PREDEF_IDENT_IDS};
Stream.EmitRecordWithBlob(IdentifierOffsetAbbrev, Record,
                          bytes(IdentifierOffsets));

// In C++, write the list of interesting identifiers (those that are
// defined as macros, poisoned, or similar unusual things).
if (!InterestingIdents.empty())
  Stream.EmitRecord(INTERESTING_IDENTIFIERS, InterestingIdents);
3717}

3719//===----------------------------------------------------------------------===//
3720// DeclContext's Name Lookup Table Serialization
3721//===----------------------------------------------------------------------===//

3723namespace {

3725// Trait used for the on-disk hash table used in the method pool.
3726class ASTDeclContextNameLookupTrait {
ASTWriter &Writer;
llvm::SmallVector<DeclID, 64> DeclIDs;

3730public:
using key_type = DeclarationNameKey;
using key_type_ref = key_type;

/// A start and end index into DeclIDs, representing a sequence of decls.
using data_type = std::pair<unsigned, unsigned>;
using data_type_ref = const data_type &;

using hash_value_type = unsigned;
using offset_type = unsigned;

explicit ASTDeclContextNameLookupTrait(ASTWriter &Writer) : Writer(Writer) {}

template<typename Coll>
data_type getData(const Coll &Decls) {
  unsigned Start = DeclIDs.size();
  for (NamedDecl *D : Decls) {
    DeclIDs.push_back(
        Writer.GetDeclRef(getDeclForLocalLookup(Writer.getLangOpts(), D)));
  }
  return std::make_pair(Start, DeclIDs.size());
}

data_type ImportData(const reader::ASTDeclContextNameLookupTrait::data_type &FromReader) {
  unsigned Start = DeclIDs.size();
  llvm::append_range(DeclIDs, FromReader);
  return std::make_pair(Start, DeclIDs.size());
}

static bool EqualKey(key_type_ref a, key_type_ref b) {
  return a == b;
}

hash_value_type ComputeHash(DeclarationNameKey Name) {
  return Name.getHash();
}

void EmitFileRef(raw_ostream &Out, ModuleFile *F) const {
  assert(Writer.hasChain() &&(static_cast <bool> (Writer.hasChain() && "have reference to loaded module file but no chain?"
) ? void (0) : __assert_fail ("Writer.hasChain() && \"have reference to loaded module file but no chain?\""
, "clang/lib/Serialization/ASTWriter.cpp", 3769, __extension__
 __PRETTY_FUNCTION__))
         "have reference to loaded module file but no chain?")(static_cast <bool> (Writer.hasChain() && "have reference to loaded module file but no chain?"
) ? void (0) : __assert_fail ("Writer.hasChain() && \"have reference to loaded module file but no chain?\""
, "clang/lib/Serialization/ASTWriter.cpp", 3769, __extension__
 __PRETTY_FUNCTION__));

  using namespace llvm::support;

  endian::write<uint32_t>(Out, Writer.getChain()->getModuleFileID(F), little);
}

std::pair<unsigned, unsigned> EmitKeyDataLength(raw_ostream &Out,
                                                DeclarationNameKey Name,
                                                data_type_ref Lookup) {
  unsigned KeyLen = 1;
  switch (Name.getKind()) {
  case DeclarationName::Identifier:
  case DeclarationName::ObjCZeroArgSelector:
  case DeclarationName::ObjCOneArgSelector:
  case DeclarationName::ObjCMultiArgSelector:
  case DeclarationName::CXXLiteralOperatorName:
  case DeclarationName::CXXDeductionGuideName:
    KeyLen += 4;
    break;
  case DeclarationName::CXXOperatorName:
    KeyLen += 1;
    break;
  case DeclarationName::CXXConstructorName:
  case DeclarationName::CXXDestructorName:
  case DeclarationName::CXXConversionFunctionName:
  case DeclarationName::CXXUsingDirective:
    break;
  }

  // 4 bytes for each DeclID.
  unsigned DataLen = 4 * (Lookup.second - Lookup.first);

  return emitULEBKeyDataLength(KeyLen, DataLen, Out);
}

void EmitKey(raw_ostream &Out, DeclarationNameKey Name, unsigned) {
  using namespace llvm::support;

  endian::Writer LE(Out, little);
  LE.write<uint8_t>(Name.getKind());
  switch (Name.getKind()) {
  case DeclarationName::Identifier:
  case DeclarationName::CXXLiteralOperatorName:
  case DeclarationName::CXXDeductionGuideName:
    LE.write<uint32_t>(Writer.getIdentifierRef(Name.getIdentifier()));
    return;
  case DeclarationName::ObjCZeroArgSelector:
  case DeclarationName::ObjCOneArgSelector:
  case DeclarationName::ObjCMultiArgSelector:
    LE.write<uint32_t>(Writer.getSelectorRef(Name.getSelector()));
    return;
  case DeclarationName::CXXOperatorName:
    assert(Name.getOperatorKind() < NUM_OVERLOADED_OPERATORS &&(static_cast <bool> (Name.getOperatorKind() < NUM_OVERLOADED_OPERATORS
 && "Invalid operator?") ? void (0) : __assert_fail (
"Name.getOperatorKind() < NUM_OVERLOADED_OPERATORS && \"Invalid operator?\""
, "clang/lib/Serialization/ASTWriter.cpp", 3823, __extension__
 __PRETTY_FUNCTION__))
           "Invalid operator?")(static_cast <bool> (Name.getOperatorKind() < NUM_OVERLOADED_OPERATORS
 && "Invalid operator?") ? void (0) : __assert_fail (
"Name.getOperatorKind() < NUM_OVERLOADED_OPERATORS && \"Invalid operator?\""
, "clang/lib/Serialization/ASTWriter.cpp", 3823, __extension__
 __PRETTY_FUNCTION__));
    LE.write<uint8_t>(Name.getOperatorKind());
    return;
  case DeclarationName::CXXConstructorName:
  case DeclarationName::CXXDestructorName:
  case DeclarationName::CXXConversionFunctionName:
  case DeclarationName::CXXUsingDirective:
    return;
  }

  llvm_unreachable("Invalid name kind?")::llvm::llvm_unreachable_internal("Invalid name kind?", "clang/lib/Serialization/ASTWriter.cpp"
, 3833);
}

void EmitData(raw_ostream &Out, key_type_ref, data_type Lookup,
              unsigned DataLen) {
  using namespace llvm::support;

  endian::Writer LE(Out, little);
  uint64_t Start = Out.tell(); (void)Start;
  for (unsigned I = Lookup.first, N = Lookup.second; I != N; ++I)
    LE.write<uint32_t>(DeclIDs[I]);
  assert(Out.tell() - Start == DataLen && "Data length is wrong")(static_cast <bool> (Out.tell() - Start == DataLen &&
 "Data length is wrong") ? void (0) : __assert_fail ("Out.tell() - Start == DataLen && \"Data length is wrong\""
, "clang/lib/Serialization/ASTWriter.cpp", 3844, __extension__
 __PRETTY_FUNCTION__));
}
3846};

3848} // namespace

3850bool ASTWriter::isLookupResultExternal(StoredDeclsList &Result,
                                     DeclContext *DC) {
return Result.hasExternalDecls() &&
       DC->hasNeedToReconcileExternalVisibleStorage();
3854}

3856bool ASTWriter::isLookupResultEntirelyExternal(StoredDeclsList &Result,
                                             DeclContext *DC) {
for (auto *D : Result.getLookupResult())
  if (!getDeclForLocalLookup(getLangOpts(), D)->isFromASTFile())
    return false;

return true;
3863}

3865void
3866ASTWriter::GenerateNameLookupTable(const DeclContext *ConstDC,
                                 llvm::SmallVectorImpl<char> &LookupTable) {
assert(!ConstDC->hasLazyLocalLexicalLookups() &&(static_cast <bool> (!ConstDC->hasLazyLocalLexicalLookups
() && !ConstDC->hasLazyExternalLexicalLookups() &&
 "must call buildLookups first") ? void (0) : __assert_fail (
"!ConstDC->hasLazyLocalLexicalLookups() && !ConstDC->hasLazyExternalLexicalLookups() && \"must call buildLookups first\""
, "clang/lib/Serialization/ASTWriter.cpp", 3870, __extension__
 __PRETTY_FUNCTION__))
       !ConstDC->hasLazyExternalLexicalLookups() &&(static_cast <bool> (!ConstDC->hasLazyLocalLexicalLookups
() && !ConstDC->hasLazyExternalLexicalLookups() &&
 "must call buildLookups first") ? void (0) : __assert_fail (
"!ConstDC->hasLazyLocalLexicalLookups() && !ConstDC->hasLazyExternalLexicalLookups() && \"must call buildLookups first\""
, "clang/lib/Serialization/ASTWriter.cpp", 3870, __extension__
 __PRETTY_FUNCTION__))
       "must call buildLookups first")(static_cast <bool> (!ConstDC->hasLazyLocalLexicalLookups
() && !ConstDC->hasLazyExternalLexicalLookups() &&
 "must call buildLookups first") ? void (0) : __assert_fail (
"!ConstDC->hasLazyLocalLexicalLookups() && !ConstDC->hasLazyExternalLexicalLookups() && \"must call buildLookups first\""
, "clang/lib/Serialization/ASTWriter.cpp", 3870, __extension__
 __PRETTY_FUNCTION__));

// FIXME: We need to build the lookups table, which is logically const.
auto *DC = const_cast<DeclContext*>(ConstDC);
assert(DC == DC->getPrimaryContext() && "only primary DC has lookup table")(static_cast <bool> (DC == DC->getPrimaryContext() &&
 "only primary DC has lookup table") ? void (0) : __assert_fail
 ("DC == DC->getPrimaryContext() && \"only primary DC has lookup table\""
, "clang/lib/Serialization/ASTWriter.cpp", 3874, __extension__
 __PRETTY_FUNCTION__));

// Create the on-disk hash table representation.
MultiOnDiskHashTableGenerator<reader::ASTDeclContextNameLookupTrait,
                              ASTDeclContextNameLookupTrait> Generator;
ASTDeclContextNameLookupTrait Trait(*this);

// The first step is to collect the declaration names which we need to
// serialize into the name lookup table, and to collect them in a stable
// order.
SmallVector<DeclarationName, 16> Names;

// We also build up small sets of the constructor and conversion function
// names which are visible.
llvm::SmallPtrSet<DeclarationName, 8> ConstructorNameSet, ConversionNameSet;

for (auto &Lookup : *DC->buildLookup()) {
  auto &Name = Lookup.first;
  auto &Result = Lookup.second;

  // If there are no local declarations in our lookup result, we
  // don't need to write an entry for the name at all. If we can't
  // write out a lookup set without performing more deserialization,
  // just skip this entry.
  if (isLookupResultExternal(Result, DC) &&
      isLookupResultEntirelyExternal(Result, DC))
    continue;

  // We also skip empty results. If any of the results could be external and
  // the currently available results are empty, then all of the results are
  // external and we skip it above. So the only way we get here with an empty
  // results is when no results could have been external *and* we have
  // external results.
  //
  // FIXME: While we might want to start emitting on-disk entries for negative
  // lookups into a decl context as an optimization, today we *have* to skip
  // them because there are names with empty lookup results in decl contexts
  // which we can't emit in any stable ordering: we lookup constructors and
  // conversion functions in the enclosing namespace scope creating empty
  // results for them. This in almost certainly a bug in Clang's name lookup,
  // but that is likely to be hard or impossible to fix and so we tolerate it
  // here by omitting lookups with empty results.
  if (Lookup.second.getLookupResult().empty())
    continue;

  switch (Lookup.first.getNameKind()) {
  default:
    Names.push_back(Lookup.first);
    break;

  case DeclarationName::CXXConstructorName:
    assert(isa<CXXRecordDecl>(DC) &&(static_cast <bool> (isa<CXXRecordDecl>(DC) &&
 "Cannot have a constructor name outside of a class!") ? void
 (0) : __assert_fail ("isa<CXXRecordDecl>(DC) && \"Cannot have a constructor name outside of a class!\""
, "clang/lib/Serialization/ASTWriter.cpp", 3926, __extension__
 __PRETTY_FUNCTION__))
           "Cannot have a constructor name outside of a class!")(static_cast <bool> (isa<CXXRecordDecl>(DC) &&
 "Cannot have a constructor name outside of a class!") ? void
 (0) : __assert_fail ("isa<CXXRecordDecl>(DC) && \"Cannot have a constructor name outside of a class!\""
, "clang/lib/Serialization/ASTWriter.cpp", 3926, __extension__
 __PRETTY_FUNCTION__));
    ConstructorNameSet.insert(Name);
    break;

  case DeclarationName::CXXConversionFunctionName:
    assert(isa<CXXRecordDecl>(DC) &&(static_cast <bool> (isa<CXXRecordDecl>(DC) &&
 "Cannot have a conversion function name outside of a class!"
) ? void (0) : __assert_fail ("isa<CXXRecordDecl>(DC) && \"Cannot have a conversion function name outside of a class!\""
, "clang/lib/Serialization/ASTWriter.cpp", 3932, __extension__
 __PRETTY_FUNCTION__))
           "Cannot have a conversion function name outside of a class!")(static_cast <bool> (isa<CXXRecordDecl>(DC) &&
 "Cannot have a conversion function name outside of a class!"
) ? void (0) : __assert_fail ("isa<CXXRecordDecl>(DC) && \"Cannot have a conversion function name outside of a class!\""
, "clang/lib/Serialization/ASTWriter.cpp", 3932, __extension__
 __PRETTY_FUNCTION__));
    ConversionNameSet.insert(Name);
    break;
  }
}

// Sort the names into a stable order.
llvm::sort(Names);

if (auto *D = dyn_cast<CXXRecordDecl>(DC)) {
  // We need to establish an ordering of constructor and conversion function
  // names, and they don't have an intrinsic ordering.

  // First we try the easy case by forming the current context's constructor
  // name and adding that name first. This is a very useful optimization to
  // avoid walking the lexical declarations in many cases, and it also
  // handles the only case where a constructor name can come from some other
  // lexical context -- when that name is an implicit constructor merged from
  // another declaration in the redecl chain. Any non-implicit constructor or
  // conversion function which doesn't occur in all the lexical contexts
  // would be an ODR violation.
  auto ImplicitCtorName = Context->DeclarationNames.getCXXConstructorName(
      Context->getCanonicalType(Context->getRecordType(D)));
  if (ConstructorNameSet.erase(ImplicitCtorName))
    Names.push_back(ImplicitCtorName);

  // If we still have constructors or conversion functions, we walk all the
  // names in the decl and add the constructors and conversion functions
  // which are visible in the order they lexically occur within the context.
  if (!ConstructorNameSet.empty() || !ConversionNameSet.empty())
    for (Decl *ChildD : cast<CXXRecordDecl>(DC)->decls())
      if (auto *ChildND = dyn_cast<NamedDecl>(ChildD)) {
        auto Name = ChildND->getDeclName();
        switch (Name.getNameKind()) {
        default:
          continue;

        case DeclarationName::CXXConstructorName:
          if (ConstructorNameSet.erase(Name))
            Names.push_back(Name);
          break;

        case DeclarationName::CXXConversionFunctionName:
          if (ConversionNameSet.erase(Name))
            Names.push_back(Name);
          break;
        }

        if (ConstructorNameSet.empty() && ConversionNameSet.empty())
          break;
      }

  assert(ConstructorNameSet.empty() && "Failed to find all of the visible "(static_cast <bool> (ConstructorNameSet.empty() &&
 "Failed to find all of the visible " "constructors by walking all the "
 "lexical members of the context.") ? void (0) : __assert_fail
 ("ConstructorNameSet.empty() && \"Failed to find all of the visible \" \"constructors by walking all the \" \"lexical members of the context.\""
, "clang/lib/Serialization/ASTWriter.cpp", 3986, __extension__
 __PRETTY_FUNCTION__))
                                       "constructors by walking all the "(static_cast <bool> (ConstructorNameSet.empty() &&
 "Failed to find all of the visible " "constructors by walking all the "
 "lexical members of the context.") ? void (0) : __assert_fail
 ("ConstructorNameSet.empty() && \"Failed to find all of the visible \" \"constructors by walking all the \" \"lexical members of the context.\""
, "clang/lib/Serialization/ASTWriter.cpp", 3986, __extension__
 __PRETTY_FUNCTION__))
                                       "lexical members of the context.")(static_cast <bool> (ConstructorNameSet.empty() &&
 "Failed to find all of the visible " "constructors by walking all the "
 "lexical members of the context.") ? void (0) : __assert_fail
 ("ConstructorNameSet.empty() && \"Failed to find all of the visible \" \"constructors by walking all the \" \"lexical members of the context.\""
, "clang/lib/Serialization/ASTWriter.cpp", 3986, __extension__
 __PRETTY_FUNCTION__));
  assert(ConversionNameSet.empty() && "Failed to find all of the visible "(static_cast <bool> (ConversionNameSet.empty() &&
 "Failed to find all of the visible " "conversion functions by walking all "
 "the lexical members of the context.") ? void (0) : __assert_fail
 ("ConversionNameSet.empty() && \"Failed to find all of the visible \" \"conversion functions by walking all \" \"the lexical members of the context.\""
, "clang/lib/Serialization/ASTWriter.cpp", 3989, __extension__
 __PRETTY_FUNCTION__))
                                      "conversion functions by walking all "(static_cast <bool> (ConversionNameSet.empty() &&
 "Failed to find all of the visible " "conversion functions by walking all "
 "the lexical members of the context.") ? void (0) : __assert_fail
 ("ConversionNameSet.empty() && \"Failed to find all of the visible \" \"conversion functions by walking all \" \"the lexical members of the context.\""
, "clang/lib/Serialization/ASTWriter.cpp", 3989, __extension__
 __PRETTY_FUNCTION__))
                                      "the lexical members of the context.")(static_cast <bool> (ConversionNameSet.empty() &&
 "Failed to find all of the visible " "conversion functions by walking all "
 "the lexical members of the context.") ? void (0) : __assert_fail
 ("ConversionNameSet.empty() && \"Failed to find all of the visible \" \"conversion functions by walking all \" \"the lexical members of the context.\""
, "clang/lib/Serialization/ASTWriter.cpp", 3989, __extension__
 __PRETTY_FUNCTION__));
}

// Next we need to do a lookup with each name into this decl context to fully
// populate any results from external sources. We don't actually use the
// results of these lookups because we only want to use the results after all
// results have been loaded and the pointers into them will be stable.
for (auto &Name : Names)
  DC->lookup(Name);

// Now we need to insert the results for each name into the hash table. For
// constructor names and conversion function names, we actually need to merge
// all of the results for them into one list of results each and insert
// those.
SmallVector<NamedDecl *, 8> ConstructorDecls;
SmallVector<NamedDecl *, 8> ConversionDecls;

// Now loop over the names, either inserting them or appending for the two
// special cases.
for (auto &Name : Names) {
  DeclContext::lookup_result Result = DC->noload_lookup(Name);

  switch (Name.getNameKind()) {
  default:
    Generator.insert(Name, Trait.getData(Result), Trait);
    break;

  case DeclarationName::CXXConstructorName:
    ConstructorDecls.append(Result.begin(), Result.end());
    break;

  case DeclarationName::CXXConversionFunctionName:
    ConversionDecls.append(Result.begin(), Result.end());
    break;
  }
}

// Handle our two special cases if we ended up having any. We arbitrarily use
// the first declaration's name here because the name itself isn't part of
// the key, only the kind of name is used.
if (!ConstructorDecls.empty())
  Generator.insert(ConstructorDecls.front()->getDeclName(),
                   Trait.getData(ConstructorDecls), Trait);
if (!ConversionDecls.empty())
  Generator.insert(ConversionDecls.front()->getDeclName(),
                   Trait.getData(ConversionDecls), Trait);

// Create the on-disk hash table. Also emit the existing imported and
// merged table if there is one.
auto *Lookups = Chain ? Chain->getLoadedLookupTables(DC) : nullptr;
Generator.emit(LookupTable, Trait, Lookups ? &Lookups->Table : nullptr);
4040}

4042/// Write the block containing all of the declaration IDs
4043/// visible from the given DeclContext.
4044///
4045/// \returns the offset of the DECL_CONTEXT_VISIBLE block within the
4046/// bitstream, or 0 if no block was written.
4047uint64_t ASTWriter::WriteDeclContextVisibleBlock(ASTContext &Context,
                                               DeclContext *DC) {
// If we imported a key declaration of this namespace, write the visible
// lookup results as an update record for it rather than including them
// on this declaration. We will only look at key declarations on reload.
if (isa<NamespaceDecl>(DC) && Chain &&
    Chain->getKeyDeclaration(cast<Decl>(DC))->isFromASTFile()) {
  // Only do this once, for the first local declaration of the namespace.
  for (auto *Prev = cast<NamespaceDecl>(DC)->getPreviousDecl(); Prev;
       Prev = Prev->getPreviousDecl())
    if (!Prev->isFromASTFile())
      return 0;

  // Note that we need to emit an update record for the primary context.
  UpdatedDeclContexts.insert(DC->getPrimaryContext());

  // Make sure all visible decls are written. They will be recorded later. We
  // do this using a side data structure so we can sort the names into
  // a deterministic order.
  StoredDeclsMap *Map = DC->getPrimaryContext()->buildLookup();
  SmallVector<std::pair<DeclarationName, DeclContext::lookup_result>, 16>
      LookupResults;
  if (Map) {
    LookupResults.reserve(Map->size());
    for (auto &Entry : *Map)
      LookupResults.push_back(
          std::make_pair(Entry.first, Entry.second.getLookupResult()));
  }

  llvm::sort(LookupResults, llvm::less_first());
  for (auto &NameAndResult : LookupResults) {
    DeclarationName Name = NameAndResult.first;
    DeclContext::lookup_result Result = NameAndResult.second;
    if (Name.getNameKind() == DeclarationName::CXXConstructorName ||
        Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
      // We have to work around a name lookup bug here where negative lookup
      // results for these names get cached in namespace lookup tables (these
      // names should never be looked up in a namespace).
      assert(Result.empty() && "Cannot have a constructor or conversion "(static_cast <bool> (Result.empty() && "Cannot have a constructor or conversion "
 "function name in a namespace!") ? void (0) : __assert_fail (
"Result.empty() && \"Cannot have a constructor or conversion \" \"function name in a namespace!\""
, "clang/lib/Serialization/ASTWriter.cpp", 4086, __extension__
 __PRETTY_FUNCTION__))
                               "function name in a namespace!")(static_cast <bool> (Result.empty() && "Cannot have a constructor or conversion "
 "function name in a namespace!") ? void (0) : __assert_fail (
"Result.empty() && \"Cannot have a constructor or conversion \" \"function name in a namespace!\""
, "clang/lib/Serialization/ASTWriter.cpp", 4086, __extension__
 __PRETTY_FUNCTION__));
      continue;
    }

    for (NamedDecl *ND : Result)
      if (!ND->isFromASTFile())
        GetDeclRef(ND);
  }

  return 0;
}

if (DC->getPrimaryContext() != DC)
  return 0;

// Skip contexts which don't support name lookup.
if (!DC->isLookupContext())
  return 0;

// If not in C++, we perform name lookup for the translation unit via the
// IdentifierInfo chains, don't bother to build a visible-declarations table.
if (DC->isTranslationUnit() && !Context.getLangOpts().CPlusPlus)
  return 0;

// Serialize the contents of the mapping used for lookup. Note that,
// although we have two very different code paths, the serialized
// representation is the same for both cases: a declaration name,
// followed by a size, followed by references to the visible
// declarations that have that name.
uint64_t Offset = Stream.GetCurrentBitNo();
StoredDeclsMap *Map = DC->buildLookup();
if (!Map || Map->empty())
  return 0;

// Create the on-disk hash table in a buffer.
SmallString<4096> LookupTable;
GenerateNameLookupTable(DC, LookupTable);

// Write the lookup table
RecordData::value_type Record[] = {DECL_CONTEXT_VISIBLE};
Stream.EmitRecordWithBlob(DeclContextVisibleLookupAbbrev, Record,
                          LookupTable);
++NumVisibleDeclContexts;
return Offset;
4130}

4132/// Write an UPDATE_VISIBLE block for the given context.
4133///
4134/// UPDATE_VISIBLE blocks contain the declarations that are added to an existing
4135/// DeclContext in a dependent AST file. As such, they only exist for the TU
4136/// (in C++), for namespaces, and for classes with forward-declared unscoped
4137/// enumeration members (in C++11).
4138void ASTWriter::WriteDeclContextVisibleUpdate(const DeclContext *DC) {
StoredDeclsMap *Map = DC->getLookupPtr();
if (!Map || Map->empty())
  return;

// Create the on-disk hash table in a buffer.
SmallString<4096> LookupTable;
GenerateNameLookupTable(DC, LookupTable);

// If we're updating a namespace, select a key declaration as the key for the
// update record; those are the only ones that will be checked on reload.
if (isa<NamespaceDecl>(DC))
  DC = cast<DeclContext>(Chain->getKeyDeclaration(cast<Decl>(DC)));

// Write the lookup table
RecordData::value_type Record[] = {UPDATE_VISIBLE, getDeclID(cast<Decl>(DC))};
Stream.EmitRecordWithBlob(UpdateVisibleAbbrev, Record, LookupTable);
4155}

4157/// Write an FP_PRAGMA_OPTIONS block for the given FPOptions.
4158void ASTWriter::WriteFPPragmaOptions(const FPOptionsOverride &Opts) {
RecordData::value_type Record[] = {Opts.getAsOpaqueInt()};
Stream.EmitRecord(FP_PRAGMA_OPTIONS, Record);
1
Calling 'BitstreamWriter::EmitRecord'→
4161}

4163/// Write an OPENCL_EXTENSIONS block for the given OpenCLOptions.
4164void ASTWriter::WriteOpenCLExtensions(Sema &SemaRef) {
if (!SemaRef.Context.getLangOpts().OpenCL)
  return;

const OpenCLOptions &Opts = SemaRef.getOpenCLOptions();
RecordData Record;
for (const auto &I:Opts.OptMap) {
  AddString(I.getKey(), Record);
  auto V = I.getValue();
  Record.push_back(V.Supported ? 1 : 0);
  Record.push_back(V.Enabled ? 1 : 0);
  Record.push_back(V.WithPragma ? 1 : 0);
  Record.push_back(V.Avail);
  Record.push_back(V.Core);
  Record.push_back(V.Opt);
}
Stream.EmitRecord(OPENCL_EXTENSIONS, Record);
4181}
4182void ASTWriter::WriteCUDAPragmas(Sema &SemaRef) {
if (SemaRef.ForceCUDAHostDeviceDepth > 0) {
  RecordData::value_type Record[] = {SemaRef.ForceCUDAHostDeviceDepth};
  Stream.EmitRecord(CUDA_PRAGMA_FORCE_HOST_DEVICE_DEPTH, Record);
}
4187}

4189void ASTWriter::WriteObjCCategories() {
SmallVector<ObjCCategoriesInfo, 2> CategoriesMap;
RecordData Categories;

for (unsigned I = 0, N = ObjCClassesWithCategories.size(); I != N; ++I) {
  unsigned Size = 0;
  unsigned StartIndex = Categories.size();

  ObjCInterfaceDecl *Class = ObjCClassesWithCategories[I];

  // Allocate space for the size.
  Categories.push_back(0);

  // Add the categories.
  for (ObjCInterfaceDecl::known_categories_iterator
         Cat = Class->known_categories_begin(),
         CatEnd = Class->known_categories_end();
       Cat != CatEnd; ++Cat, ++Size) {
    assert(getDeclID(*Cat) != 0 && "Bogus category")(static_cast <bool> (getDeclID(*Cat) != 0 && "Bogus category"
) ? void (0) : __assert_fail ("getDeclID(*Cat) != 0 && \"Bogus category\""
, "clang/lib/Serialization/ASTWriter.cpp", 4207, __extension__
 __PRETTY_FUNCTION__));
    AddDeclRef(*Cat, Categories);
  }

  // Update the size.
  Categories[StartIndex] = Size;

  // Record this interface -> category map.
  ObjCCategoriesInfo CatInfo = { getDeclID(Class), StartIndex };
  CategoriesMap.push_back(CatInfo);
}

// Sort the categories map by the definition ID, since the reader will be
// performing binary searches on this information.
llvm::array_pod_sort(CategoriesMap.begin(), CategoriesMap.end());

// Emit the categories map.
using namespace llvm;

auto Abbrev = std::make_shared<BitCodeAbbrev>();
Abbrev->Add(BitCodeAbbrevOp(OBJC_CATEGORIES_MAP));
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // # of entries
Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
unsigned AbbrevID = Stream.EmitAbbrev(std::move(Abbrev));

RecordData::value_type Record[] = {OBJC_CATEGORIES_MAP, CategoriesMap.size()};
Stream.EmitRecordWithBlob(AbbrevID, Record,
                          reinterpret_cast<char *>(CategoriesMap.data()),
                          CategoriesMap.size() * sizeof(ObjCCategoriesInfo));

// Emit the category lists.
Stream.EmitRecord(OBJC_CATEGORIES, Categories);
4239}

4241void ASTWriter::WriteLateParsedTemplates(Sema &SemaRef) {
Sema::LateParsedTemplateMapT &LPTMap = SemaRef.LateParsedTemplateMap;

if (LPTMap.empty())
  return;

RecordData Record;
for (auto &LPTMapEntry : LPTMap) {
  const FunctionDecl *FD = LPTMapEntry.first;
  LateParsedTemplate &LPT = *LPTMapEntry.second;
  AddDeclRef(FD, Record);
  AddDeclRef(LPT.D, Record);
  Record.push_back(LPT.Toks.size());

  for (const auto &Tok : LPT.Toks) {
    AddToken(Tok, Record);
  }
}
Stream.EmitRecord(LATE_PARSED_TEMPLATE, Record);
4260}

4262/// Write the state of 'pragma clang optimize' at the end of the module.
4263void ASTWriter::WriteOptimizePragmaOptions(Sema &SemaRef) {
RecordData Record;
SourceLocation PragmaLoc = SemaRef.getOptimizeOffPragmaLocation();
AddSourceLocation(PragmaLoc, Record);
Stream.EmitRecord(OPTIMIZE_PRAGMA_OPTIONS, Record);
4268}

4270/// Write the state of 'pragma ms_struct' at the end of the module.
4271void ASTWriter::WriteMSStructPragmaOptions(Sema &SemaRef) {
RecordData Record;
Record.push_back(SemaRef.MSStructPragmaOn ? PMSST_ON : PMSST_OFF);
Stream.EmitRecord(MSSTRUCT_PRAGMA_OPTIONS, Record);
4275}

4277/// Write the state of 'pragma pointers_to_members' at the end of the
4278//module.
4279void ASTWriter::WriteMSPointersToMembersPragmaOptions(Sema &SemaRef) {
RecordData Record;
Record.push_back(SemaRef.MSPointerToMemberRepresentationMethod);
AddSourceLocation(SemaRef.ImplicitMSInheritanceAttrLoc, Record);
Stream.EmitRecord(POINTERS_TO_MEMBERS_PRAGMA_OPTIONS, Record);
4284}

4286/// Write the state of 'pragma align/pack' at the end of the module.
4287void ASTWriter::WritePackPragmaOptions(Sema &SemaRef) {
// Don't serialize pragma align/pack state for modules, since it should only
// take effect on a per-submodule basis.
if (WritingModule)
  return;

RecordData Record;
AddAlignPackInfo(SemaRef.AlignPackStack.CurrentValue, Record);
AddSourceLocation(SemaRef.AlignPackStack.CurrentPragmaLocation, Record);
Record.push_back(SemaRef.AlignPackStack.Stack.size());
for (const auto &StackEntry : SemaRef.AlignPackStack.Stack) {
  AddAlignPackInfo(StackEntry.Value, Record);
  AddSourceLocation(StackEntry.PragmaLocation, Record);
  AddSourceLocation(StackEntry.PragmaPushLocation, Record);
  AddString(StackEntry.StackSlotLabel, Record);
}
Stream.EmitRecord(ALIGN_PACK_PRAGMA_OPTIONS, Record);
4304}

4306/// Write the state of 'pragma float_control' at the end of the module.
4307void ASTWriter::WriteFloatControlPragmaOptions(Sema &SemaRef) {
// Don't serialize pragma float_control state for modules,
// since it should only take effect on a per-submodule basis.
if (WritingModule)
  return;

RecordData Record;
Record.push_back(SemaRef.FpPragmaStack.CurrentValue.getAsOpaqueInt());
AddSourceLocation(SemaRef.FpPragmaStack.CurrentPragmaLocation, Record);
Record.push_back(SemaRef.FpPragmaStack.Stack.size());
for (const auto &StackEntry : SemaRef.FpPragmaStack.Stack) {
  Record.push_back(StackEntry.Value.getAsOpaqueInt());
  AddSourceLocation(StackEntry.PragmaLocation, Record);
  AddSourceLocation(StackEntry.PragmaPushLocation, Record);
  AddString(StackEntry.StackSlotLabel, Record);
}
Stream.EmitRecord(FLOAT_CONTROL_PRAGMA_OPTIONS, Record);
4324}

4326void ASTWriter::WriteModuleFileExtension(Sema &SemaRef,
                                       ModuleFileExtensionWriter &Writer) {
// Enter the extension block.
Stream.EnterSubblock(EXTENSION_BLOCK_ID, 4);

// Emit the metadata record abbreviation.
auto Abv = std::make_shared<llvm::BitCodeAbbrev>();
Abv->Add(llvm::BitCodeAbbrevOp(EXTENSION_METADATA));
Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::Blob));
unsigned Abbrev = Stream.EmitAbbrev(std::move(Abv));

// Emit the metadata record.
RecordData Record;
auto Metadata = Writer.getExtension()->getExtensionMetadata();
Record.push_back(EXTENSION_METADATA);
Record.push_back(Metadata.MajorVersion);
Record.push_back(Metadata.MinorVersion);
Record.push_back(Metadata.BlockName.size());
Record.push_back(Metadata.UserInfo.size());
SmallString<64> Buffer;
Buffer += Metadata.BlockName;
Buffer += Metadata.UserInfo;
Stream.EmitRecordWithBlob(Abbrev, Record, Buffer);

// Emit the contents of the extension block.
Writer.writeExtensionContents(SemaRef, Stream);

// Exit the extension block.
Stream.ExitBlock();
4359}

4361//===----------------------------------------------------------------------===//
4362// General Serialization Routines
4363//===----------------------------------------------------------------------===//

4365void ASTRecordWriter::AddAttr(const Attr *A) {
auto &Record = *this;
// FIXME: Clang can't handle the serialization/deserialization of
// preferred_name properly now. See
// https://github.com/llvm/llvm-project/issues/56490 for example.
if (!A || (isa<PreferredNameAttr>(A) &&
           Writer->isWritingStdCXXNamedModules()))
  return Record.push_back(0);

Record.push_back(A->getKind() + 1); // FIXME: stable encoding, target attrs

Record.AddIdentifierRef(A->getAttrName());
Record.AddIdentifierRef(A->getScopeName());
Record.AddSourceRange(A->getRange());
Record.AddSourceLocation(A->getScopeLoc());
Record.push_back(A->getParsedKind());
Record.push_back(A->getSyntax());
Record.push_back(A->getAttributeSpellingListIndexRaw());

4384#include "clang/Serialization/AttrPCHWrite.inc"
4385}

4387/// Emit the list of attributes to the specified record.
4388void ASTRecordWriter::AddAttributes(ArrayRef<const Attr *> Attrs) {
push_back(Attrs.size());
for (const auto *A : Attrs)
  AddAttr(A);
4392}

4394void ASTWriter::AddToken(const Token &Tok, RecordDataImpl &Record) {
AddSourceLocation(Tok.getLocation(), Record);
// FIXME: Should translate token kind to a stable encoding.
Record.push_back(Tok.getKind());
// FIXME: Should translate token flags to a stable encoding.
Record.push_back(Tok.getFlags());

if (Tok.isAnnotation()) {
  AddSourceLocation(Tok.getAnnotationEndLoc(), Record);
  switch (Tok.getKind()) {
  case tok::annot_pragma_loop_hint: {
    auto *Info = static_cast<PragmaLoopHintInfo *>(Tok.getAnnotationValue());
    AddToken(Info->PragmaName, Record);
    AddToken(Info->Option, Record);
    Record.push_back(Info->Toks.size());
    for (const auto &T : Info->Toks)
      AddToken(T, Record);
    break;
  }
  // Some annotation tokens do not use the PtrData field.
  case tok::annot_pragma_openmp:
  case tok::annot_pragma_openmp_end:
  case tok::annot_pragma_unused:
    break;
  default:
    llvm_unreachable("missing serialization code for annotation token")::llvm::llvm_unreachable_internal("missing serialization code for annotation token"
, "clang/lib/Serialization/ASTWriter.cpp", 4419);
  }
} else {
  Record.push_back(Tok.getLength());
  // FIXME: When reading literal tokens, reconstruct the literal pointer if it
  // is needed.
  AddIdentifierRef(Tok.getIdentifierInfo(), Record);
}
4427}

4429void ASTWriter::AddString(StringRef Str, RecordDataImpl &Record) {
Record.push_back(Str.size());
Record.insert(Record.end(), Str.begin(), Str.end());
4432}

4434bool ASTWriter::PreparePathForOutput(SmallVectorImpl<char> &Path) {
assert(Context && "should have context when outputting path")(static_cast <bool> (Context && "should have context when outputting path"
) ? void (0) : __assert_fail ("Context && \"should have context when outputting path\""
, "clang/lib/Serialization/ASTWriter.cpp", 4435, __extension__
 __PRETTY_FUNCTION__));

bool Changed =
    cleanPathForOutput(Context->getSourceManager().getFileManager(), Path);

// Remove a prefix to make the path relative, if relevant.
const char *PathBegin = Path.data();
const char *PathPtr =
    adjustFilenameForRelocatableAST(PathBegin, BaseDirectory);
if (PathPtr != PathBegin) {
  Path.erase(Path.begin(), Path.begin() + (PathPtr - PathBegin));
  Changed = true;
}

return Changed;
4450}

4452void ASTWriter::AddPath(StringRef Path, RecordDataImpl &Record) {
SmallString<128> FilePath(Path);
PreparePathForOutput(FilePath);
AddString(FilePath, Record);
4456}

4458void ASTWriter::EmitRecordWithPath(unsigned Abbrev, RecordDataRef Record,
                                 StringRef Path) {
SmallString<128> FilePath(Path);
PreparePathForOutput(FilePath);
Stream.EmitRecordWithBlob(Abbrev, Record, FilePath);
4463}

4465void ASTWriter::AddVersionTuple(const VersionTuple &Version,
                              RecordDataImpl &Record) {
Record.push_back(Version.getMajor());
if (std::optional<unsigned> Minor = Version.getMinor())
  Record.push_back(*Minor + 1);
else
  Record.push_back(0);
if (std::optional<unsigned> Subminor = Version.getSubminor())
  Record.push_back(*Subminor + 1);
else
  Record.push_back(0);
4476}

4478/// Note that the identifier II occurs at the given offset
4479/// within the identifier table.
4480void ASTWriter::SetIdentifierOffset(const IdentifierInfo *II, uint32_t Offset) {
IdentID ID = IdentifierIDs[II];
// Only store offsets new to this AST file. Other identifier names are looked
// up earlier in the chain and thus don't need an offset.
if (ID >= FirstIdentID)
  IdentifierOffsets[ID - FirstIdentID] = Offset;
4486}

4488/// Note that the selector Sel occurs at the given offset
4489/// within the method pool/selector table.
4490void ASTWriter::SetSelectorOffset(Selector Sel, uint32_t Offset) {
unsigned ID = SelectorIDs[Sel];
assert(ID && "Unknown selector")(static_cast <bool> (ID && "Unknown selector") ?
 void (0) : __assert_fail ("ID && \"Unknown selector\""
, "clang/lib/Serialization/ASTWriter.cpp", 4492, __extension__
 __PRETTY_FUNCTION__));
// Don't record offsets for selectors that are also available in a different
// file.
if (ID < FirstSelectorID)
  return;
SelectorOffsets[ID - FirstSelectorID] = Offset;
4498}

4500ASTWriter::ASTWriter(llvm::BitstreamWriter &Stream,
                   SmallVectorImpl<char> &Buffer,
                   InMemoryModuleCache &ModuleCache,
                   ArrayRef<std::shared_ptr<ModuleFileExtension>> Extensions,
                   bool IncludeTimestamps)
  : Stream(Stream), Buffer(Buffer), ModuleCache(ModuleCache),
    IncludeTimestamps(IncludeTimestamps) {
for (const auto &Ext : Extensions) {
  if (auto Writer = Ext->createExtensionWriter(*this))
    ModuleFileExtensionWriters.push_back(std::move(Writer));
}
4511}

4513ASTWriter::~ASTWriter() = default;

4515const LangOptions &ASTWriter::getLangOpts() const {
assert(WritingAST && "can't determine lang opts when not writing AST")(static_cast <bool> (WritingAST && "can't determine lang opts when not writing AST"
) ? void (0) : __assert_fail ("WritingAST && \"can't determine lang opts when not writing AST\""
, "clang/lib/Serialization/ASTWriter.cpp", 4516, __extension__
 __PRETTY_FUNCTION__));
return Context->getLangOpts();
4518}

4520time_t ASTWriter::getTimestampForOutput(const FileEntry *E) const {
return IncludeTimestamps ? E->getModificationTime() : 0;
4522}

4524ASTFileSignature ASTWriter::WriteAST(Sema &SemaRef, StringRef OutputFile,
                                   Module *WritingModule, StringRef isysroot,
                                   bool hasErrors,
                                   bool ShouldCacheASTInMemory) {
llvm::TimeTraceScope scope("WriteAST", OutputFile);
WritingAST = true;

ASTHasCompilerErrors = hasErrors;

// Emit the file header.
Stream.Emit((unsigned)'C', 8);
Stream.Emit((unsigned)'P', 8);
Stream.Emit((unsigned)'C', 8);
Stream.Emit((unsigned)'H', 8);

WriteBlockInfoBlock();

Context = &SemaRef.Context;
PP = &SemaRef.PP;
this->WritingModule = WritingModule;
ASTFileSignature Signature = WriteASTCore(SemaRef, isysroot, WritingModule);
Context = nullptr;
PP = nullptr;
this->WritingModule = nullptr;
this->BaseDirectory.clear();

WritingAST = false;
if (ShouldCacheASTInMemory) {
  // Construct MemoryBuffer and update buffer manager.
  ModuleCache.addBuiltPCM(OutputFile,
                          llvm::MemoryBuffer::getMemBufferCopy(
                              StringRef(Buffer.begin(), Buffer.size())));
}
return Signature;
4558}

4560template<typename Vector>
4561static void AddLazyVectorDecls(ASTWriter &Writer, Vector &Vec,
                             ASTWriter::RecordData &Record) {
for (typename Vector::iterator I = Vec.begin(nullptr, true), E = Vec.end();
     I != E; ++I) {
  Writer.AddDeclRef(*I, Record);
}
4567}

4569void ASTWriter::collectNonAffectingInputFiles() {
SourceManager &SrcMgr = PP->getSourceManager();
unsigned N = SrcMgr.local_sloc_entry_size();

IsSLocAffecting.resize(N, true);

if (!WritingModule)
  return;

auto AffectingModuleMaps = GetAffectingModuleMaps(*PP, WritingModule);

unsigned FileIDAdjustment = 0;
unsigned OffsetAdjustment = 0;

NonAffectingFileIDAdjustments.reserve(N);
NonAffectingOffsetAdjustments.reserve(N);

NonAffectingFileIDAdjustments.push_back(FileIDAdjustment);
NonAffectingOffsetAdjustments.push_back(OffsetAdjustment);

for (unsigned I = 1; I != N; ++I) {
  const SrcMgr::SLocEntry *SLoc = &SrcMgr.getLocalSLocEntry(I);
  FileID FID = FileID::get(I);
  assert(&SrcMgr.getSLocEntry(FID) == SLoc)(static_cast <bool> (&SrcMgr.getSLocEntry(FID) == SLoc
) ? void (0) : __assert_fail ("&SrcMgr.getSLocEntry(FID) == SLoc"
, "clang/lib/Serialization/ASTWriter.cpp", 4592, __extension__
 __PRETTY_FUNCTION__));

  if (!SLoc->isFile())
    continue;
  const SrcMgr::FileInfo &File = SLoc->getFile();
  const SrcMgr::ContentCache *Cache = &File.getContentCache();
  if (!Cache->OrigEntry)
    continue;

  if (!isModuleMap(File.getFileCharacteristic()) ||
      AffectingModuleMaps.empty() ||
      AffectingModuleMaps.find(Cache->OrigEntry) != AffectingModuleMaps.end())
    continue;

  IsSLocAffecting[I] = false;

  FileIDAdjustment += 1;
  // Even empty files take up one element in the offset table.
  OffsetAdjustment += SrcMgr.getFileIDSize(FID) + 1;

  // If the previous file was non-affecting as well, just extend its entry
  // with our information.
  if (!NonAffectingFileIDs.empty() &&
      NonAffectingFileIDs.back().ID == FID.ID - 1) {
    NonAffectingFileIDs.back() = FID;
    NonAffectingRanges.back().setEnd(SrcMgr.getLocForEndOfFile(FID));
    NonAffectingFileIDAdjustments.back() = FileIDAdjustment;
    NonAffectingOffsetAdjustments.back() = OffsetAdjustment;
    continue;
  }

  NonAffectingFileIDs.push_back(FID);
  NonAffectingRanges.emplace_back(SrcMgr.getLocForStartOfFile(FID),
                                  SrcMgr.getLocForEndOfFile(FID));
  NonAffectingFileIDAdjustments.push_back(FileIDAdjustment);
  NonAffectingOffsetAdjustments.push_back(OffsetAdjustment);
}
4629}

4631ASTFileSignature ASTWriter::WriteASTCore(Sema &SemaRef, StringRef isysroot,
                                       Module *WritingModule) {
using namespace llvm;

bool isModule = WritingModule != nullptr;

// Make sure that the AST reader knows to finalize itself.
if (Chain)
  Chain->finalizeForWriting();

ASTContext &Context = SemaRef.Context;
Preprocessor &PP = SemaRef.PP;

collectNonAffectingInputFiles();

// Set up predefined declaration IDs.
auto RegisterPredefDecl = [&] (Decl *D, PredefinedDeclIDs ID) {
  if (D) {
    assert(D->isCanonicalDecl() && "predefined decl is not canonical")(static_cast <bool> (D->isCanonicalDecl() &&
 "predefined decl is not canonical") ? void (0) : __assert_fail
 ("D->isCanonicalDecl() && \"predefined decl is not canonical\""
, "clang/lib/Serialization/ASTWriter.cpp", 4649, __extension__
 __PRETTY_FUNCTION__));
    DeclIDs[D] = ID;
  }
};
RegisterPredefDecl(Context.getTranslationUnitDecl(),
                   PREDEF_DECL_TRANSLATION_UNIT_ID);
RegisterPredefDecl(Context.ObjCIdDecl, PREDEF_DECL_OBJC_ID_ID);
RegisterPredefDecl(Context.ObjCSelDecl, PREDEF_DECL_OBJC_SEL_ID);
RegisterPredefDecl(Context.ObjCClassDecl, PREDEF_DECL_OBJC_CLASS_ID);
RegisterPredefDecl(Context.ObjCProtocolClassDecl,
                   PREDEF_DECL_OBJC_PROTOCOL_ID);
RegisterPredefDecl(Context.Int128Decl, PREDEF_DECL_INT_128_ID);
RegisterPredefDecl(Context.UInt128Decl, PREDEF_DECL_UNSIGNED_INT_128_ID);
RegisterPredefDecl(Context.ObjCInstanceTypeDecl,
                   PREDEF_DECL_OBJC_INSTANCETYPE_ID);
RegisterPredefDecl(Context.BuiltinVaListDecl, PREDEF_DECL_BUILTIN_VA_LIST_ID);
RegisterPredefDecl(Context.VaListTagDecl, PREDEF_DECL_VA_LIST_TAG);
RegisterPredefDecl(Context.BuiltinMSVaListDecl,
                   PREDEF_DECL_BUILTIN_MS_VA_LIST_ID);
RegisterPredefDecl(Context.MSGuidTagDecl,
                   PREDEF_DECL_BUILTIN_MS_GUID_ID);
RegisterPredefDecl(Context.ExternCContext, PREDEF_DECL_EXTERN_C_CONTEXT_ID);
RegisterPredefDecl(Context.MakeIntegerSeqDecl,
                   PREDEF_DECL_MAKE_INTEGER_SEQ_ID);
RegisterPredefDecl(Context.CFConstantStringTypeDecl,
                   PREDEF_DECL_CF_CONSTANT_STRING_ID);
RegisterPredefDecl(Context.CFConstantStringTagDecl,
                   PREDEF_DECL_CF_CONSTANT_STRING_TAG_ID);
RegisterPredefDecl(Context.TypePackElementDecl,
                   PREDEF_DECL_TYPE_PACK_ELEMENT_ID);

// Build a record containing all of the tentative definitions in this file, in
// TentativeDefinitions order.  Generally, this record will be empty for
// headers.
RecordData TentativeDefinitions;
AddLazyVectorDecls(*this, SemaRef.TentativeDefinitions, TentativeDefinitions);

// Build a record containing all of the file scoped decls in this file.
RecordData UnusedFileScopedDecls;
if (!isModule)
  AddLazyVectorDecls(*this, SemaRef.UnusedFileScopedDecls,
                     UnusedFileScopedDecls);

// Build a record containing all of the delegating constructors we still need
// to resolve.
RecordData DelegatingCtorDecls;
if (!isModule)
  AddLazyVectorDecls(*this, SemaRef.DelegatingCtorDecls, DelegatingCtorDecls);

// Write the set of weak, undeclared identifiers. We always write the
// entire table, since later PCH files in a PCH chain are only interested in
// the results at the end of the chain.
RecordData WeakUndeclaredIdentifiers;
for (const auto &WeakUndeclaredIdentifierList :
     SemaRef.WeakUndeclaredIdentifiers) {
  const IdentifierInfo *const II = WeakUndeclaredIdentifierList.first;
  for (const auto &WI : WeakUndeclaredIdentifierList.second) {
    AddIdentifierRef(II, WeakUndeclaredIdentifiers);
    AddIdentifierRef(WI.getAlias(), WeakUndeclaredIdentifiers);
    AddSourceLocation(WI.getLocation(), WeakUndeclaredIdentifiers);
  }
}

// Build a record containing all of the ext_vector declarations.
RecordData ExtVectorDecls;
AddLazyVectorDecls(*this, SemaRef.ExtVectorDecls, ExtVectorDecls);

// Build a record containing all of the VTable uses information.
RecordData VTableUses;
if (!SemaRef.VTableUses.empty()) {
  for (unsigned I = 0, N = SemaRef.VTableUses.size(); I != N; ++I) {
    AddDeclRef(SemaRef.VTableUses[I].first, VTableUses);
    AddSourceLocation(SemaRef.VTableUses[I].second, VTableUses);
    VTableUses.push_back(SemaRef.VTablesUsed[SemaRef.VTableUses[I].first]);
  }
}

// Build a record containing all of the UnusedLocalTypedefNameCandidates.
RecordData UnusedLocalTypedefNameCandidates;
for (const TypedefNameDecl *TD : SemaRef.UnusedLocalTypedefNameCandidates)
  AddDeclRef(TD, UnusedLocalTypedefNameCandidates);

// Build a record containing all of pending implicit instantiations.
RecordData PendingInstantiations;
for (const auto &I : SemaRef.PendingInstantiations) {
  AddDeclRef(I.first, PendingInstantiations);
  AddSourceLocation(I.second, PendingInstantiations);
}
assert(SemaRef.PendingLocalImplicitInstantiations.empty() &&(static_cast <bool> (SemaRef.PendingLocalImplicitInstantiations
.empty() && "There are local ones at end of translation unit!"
) ? void (0) : __assert_fail ("SemaRef.PendingLocalImplicitInstantiations.empty() && \"There are local ones at end of translation unit!\""
, "clang/lib/Serialization/ASTWriter.cpp", 4738, __extension__
 __PRETTY_FUNCTION__))
       "There are local ones at end of translation unit!")(static_cast <bool> (SemaRef.PendingLocalImplicitInstantiations
.empty() && "There are local ones at end of translation unit!"
) ? void (0) : __assert_fail ("SemaRef.PendingLocalImplicitInstantiations.empty() && \"There are local ones at end of translation unit!\""
, "clang/lib/Serialization/ASTWriter.cpp", 4738, __extension__
 __PRETTY_FUNCTION__));

// Build a record containing some declaration references.
RecordData SemaDeclRefs;
if (SemaRef.StdNamespace || SemaRef.StdBadAlloc || SemaRef.StdAlignValT) {
  AddDeclRef(SemaRef.getStdNamespace(), SemaDeclRefs);
  AddDeclRef(SemaRef.getStdBadAlloc(), SemaDeclRefs);
  AddDeclRef(SemaRef.getStdAlignValT(), SemaDeclRefs);
}

RecordData CUDASpecialDeclRefs;
if (Context.getcudaConfigureCallDecl()) {
  AddDeclRef(Context.getcudaConfigureCallDecl(), CUDASpecialDeclRefs);
}

// Build a record containing all of the known namespaces.
RecordData KnownNamespaces;
for (const auto &I : SemaRef.KnownNamespaces) {
  if (!I.second)
    AddDeclRef(I.first, KnownNamespaces);
}

// Build a record of all used, undefined objects that require definitions.
RecordData UndefinedButUsed;

SmallVector<std::pair<NamedDecl *, SourceLocation>, 16> Undefined;
SemaRef.getUndefinedButUsed(Undefined);
for (const auto &I : Undefined) {
  AddDeclRef(I.first, UndefinedButUsed);
  AddSourceLocation(I.second, UndefinedButUsed);
}

// Build a record containing all delete-expressions that we would like to
// analyze later in AST.
RecordData DeleteExprsToAnalyze;

if (!isModule) {
  for (const auto &DeleteExprsInfo :
       SemaRef.getMismatchingDeleteExpressions()) {
    AddDeclRef(DeleteExprsInfo.first, DeleteExprsToAnalyze);
    DeleteExprsToAnalyze.push_back(DeleteExprsInfo.second.size());
    for (const auto &DeleteLoc : DeleteExprsInfo.second) {
      AddSourceLocation(DeleteLoc.first, DeleteExprsToAnalyze);
      DeleteExprsToAnalyze.push_back(DeleteLoc.second);
    }
  }
}

// Write the control block
WriteControlBlock(PP, Context, isysroot);

// Write the remaining AST contents.
Stream.FlushToWord();
ASTBlockRange.first = Stream.GetCurrentBitNo();
Stream.EnterSubblock(AST_BLOCK_ID, 5);
ASTBlockStartOffset = Stream.GetCurrentBitNo();

// This is so that older clang versions, before the introduction
// of the control block, can read and reject the newer PCH format.
{
  RecordData Record = {VERSION_MAJOR};
  Stream.EmitRecord(METADATA_OLD_FORMAT, Record);
}

// Create a lexical update block containing all of the declarations in the
// translation unit that do not come from other AST files.
const TranslationUnitDecl *TU = Context.getTranslationUnitDecl();
SmallVector<uint32_t, 128> NewGlobalKindDeclPairs;
for (const auto *D : TU->noload_decls()) {
  if (!D->isFromASTFile()) {
    NewGlobalKindDeclPairs.push_back(D->getKind());
    NewGlobalKindDeclPairs.push_back(GetDeclRef(D));
  }
}

auto Abv = std::make_shared<BitCodeAbbrev>();
Abv->Add(llvm::BitCodeAbbrevOp(TU_UPDATE_LEXICAL));
Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::Blob));
unsigned TuUpdateLexicalAbbrev = Stream.EmitAbbrev(std::move(Abv));
{
  RecordData::value_type Record[] = {TU_UPDATE_LEXICAL};
  Stream.EmitRecordWithBlob(TuUpdateLexicalAbbrev, Record,
                            bytes(NewGlobalKindDeclPairs));
}

// And a visible updates block for the translation unit.
Abv = std::make_shared<BitCodeAbbrev>();
Abv->Add(llvm::BitCodeAbbrevOp(UPDATE_VISIBLE));
Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::Blob));
UpdateVisibleAbbrev = Stream.EmitAbbrev(std::move(Abv));
WriteDeclContextVisibleUpdate(TU);

// If we have any extern "C" names, write out a visible update for them.
if (Context.ExternCContext)
  WriteDeclContextVisibleUpdate(Context.ExternCContext);

// If the translation unit has an anonymous namespace, and we don't already
// have an update block for it, write it as an update block.
// FIXME: Why do we not do this if there's already an update block?
if (NamespaceDecl *NS = TU->getAnonymousNamespace()) {
  ASTWriter::UpdateRecord &Record = DeclUpdates[TU];
  if (Record.empty())
    Record.push_back(DeclUpdate(UPD_CXX_ADDED_ANONYMOUS_NAMESPACE, NS));
}

// Add update records for all mangling numbers and static local numbers.
// These aren't really update records, but this is a convenient way of
// tagging this rare extra data onto the declarations.
for (const auto &Number : Context.MangleNumbers)
  if (!Number.first->isFromASTFile())
    DeclUpdates[Number.first].push_back(DeclUpdate(UPD_MANGLING_NUMBER,
                                                   Number.second));
for (const auto &Number : Context.StaticLocalNumbers)
  if (!Number.first->isFromASTFile())
    DeclUpdates[Number.first].push_back(DeclUpdate(UPD_STATIC_LOCAL_NUMBER,
                                                   Number.second));

// Make sure visible decls, added to DeclContexts previously loaded from
// an AST file, are registered for serialization. Likewise for template
// specializations added to imported templates.
for (const auto *I : DeclsToEmitEvenIfUnreferenced) {
  GetDeclRef(I);
}

// Make sure all decls associated with an identifier are registered for
// serialization, if we're storing decls with identifiers.
if (!WritingModule || !getLangOpts().CPlusPlus) {
  llvm::SmallVector<const IdentifierInfo*, 256> IIs;
  for (const auto &ID : PP.getIdentifierTable()) {
    const IdentifierInfo *II = ID.second;
    if (!Chain || !II->isFromAST() || II->hasChangedSinceDeserialization())
      IIs.push_back(II);
  }
  // Sort the identifiers to visit based on their name.
  llvm::sort(IIs, llvm::deref<std::less<>>());
  for (const IdentifierInfo *II : IIs) {
    for (IdentifierResolver::iterator D = SemaRef.IdResolver.begin(II),
                                   DEnd = SemaRef.IdResolver.end();
         D != DEnd; ++D) {
      GetDeclRef(*D);
    }
  }
}

// For method pool in the module, if it contains an entry for a selector,
// the entry should be complete, containing everything introduced by that
// module and all modules it imports. It's possible that the entry is out of
// date, so we need to pull in the new content here.

// It's possible that updateOutOfDateSelector can update SelectorIDs. To be
// safe, we copy all selectors out.
llvm::SmallVector<Selector, 256> AllSelectors;
for (auto &SelectorAndID : SelectorIDs)
  AllSelectors.push_back(SelectorAndID.first);
for (auto &Selector : AllSelectors)
  SemaRef.updateOutOfDateSelector(Selector);

// Form the record of special types.
RecordData SpecialTypes;
AddTypeRef(Context.getRawCFConstantStringType(), SpecialTypes);
AddTypeRef(Context.getFILEType(), SpecialTypes);
AddTypeRef(Context.getjmp_bufType(), SpecialTypes);
AddTypeRef(Context.getsigjmp_bufType(), SpecialTypes);
AddTypeRef(Context.ObjCIdRedefinitionType, SpecialTypes);
AddTypeRef(Context.ObjCClassRedefinitionType, SpecialTypes);
AddTypeRef(Context.ObjCSelRedefinitionType, SpecialTypes);
AddTypeRef(Context.getucontext_tType(), SpecialTypes);

if (Chain) {
  // Write the mapping information describing our module dependencies and how
  // each of those modules were mapped into our own offset/ID space, so that
  // the reader can build the appropriate mapping to its own offset/ID space.
  // The map consists solely of a blob with the following format:
  // *(module-kind:i8
  //   module-name-len:i16 module-name:len*i8
  //   source-location-offset:i32
  //   identifier-id:i32
  //   preprocessed-entity-id:i32
  //   macro-definition-id:i32
  //   submodule-id:i32
  //   selector-id:i32
  //   declaration-id:i32
  //   c++-base-specifiers-id:i32
  //   type-id:i32)
  //
  // module-kind is the ModuleKind enum value. If it is MK_PrebuiltModule,
  // MK_ExplicitModule or MK_ImplicitModule, then the module-name is the
  // module name. Otherwise, it is the module file name.
  auto Abbrev = std::make_shared<BitCodeAbbrev>();
  Abbrev->Add(BitCodeAbbrevOp(MODULE_OFFSET_MAP));
  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
  unsigned ModuleOffsetMapAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
  SmallString<2048> Buffer;
  {
    llvm::raw_svector_ostream Out(Buffer);
    for (ModuleFile &M : Chain->ModuleMgr) {
      using namespace llvm::support;

      endian::Writer LE(Out, little);
      LE.write<uint8_t>(static_cast<uint8_t>(M.Kind));
      StringRef Name = M.isModule() ? M.ModuleName : M.FileName;
      LE.write<uint16_t>(Name.size());
      Out.write(Name.data(), Name.size());

      // Note: if a base ID was uint max, it would not be possible to load
      // another module after it or have more than one entity inside it.
      uint32_t None = std::numeric_limits<uint32_t>::max();

      auto writeBaseIDOrNone = [&](auto BaseID, bool ShouldWrite) {
        assert(BaseID < std::numeric_limits<uint32_t>::max() && "base id too high")(static_cast <bool> (BaseID < std::numeric_limits<
uint32_t>::max() && "base id too high") ? void (0)
 : __assert_fail ("BaseID < std::numeric_limits<uint32_t>::max() && \"base id too high\""
, "clang/lib/Serialization/ASTWriter.cpp", 4948, __extension__
 __PRETTY_FUNCTION__));
        if (ShouldWrite)
          LE.write<uint32_t>(BaseID);
        else
          LE.write<uint32_t>(None);
      };

      // These values should be unique within a chain, since they will be read
      // as keys into ContinuousRangeMaps.
      writeBaseIDOrNone(M.SLocEntryBaseOffset, M.LocalNumSLocEntries);
      writeBaseIDOrNone(M.BaseIdentifierID, M.LocalNumIdentifiers);
      writeBaseIDOrNone(M.BaseMacroID, M.LocalNumMacros);
      writeBaseIDOrNone(M.BasePreprocessedEntityID,
                        M.NumPreprocessedEntities);
      writeBaseIDOrNone(M.BaseSubmoduleID, M.LocalNumSubmodules);
      writeBaseIDOrNone(M.BaseSelectorID, M.LocalNumSelectors);
      writeBaseIDOrNone(M.BaseDeclID, M.LocalNumDecls);
      writeBaseIDOrNone(M.BaseTypeIndex, M.LocalNumTypes);
    }
  }
  RecordData::value_type Record[] = {MODULE_OFFSET_MAP};
  Stream.EmitRecordWithBlob(ModuleOffsetMapAbbrev, Record,
                            Buffer.data(), Buffer.size());
}

// Build a record containing all of the DeclsToCheckForDeferredDiags.
SmallVector<serialization::DeclID, 64> DeclsToCheckForDeferredDiags;
for (auto *D : SemaRef.DeclsToCheckForDeferredDiags)
  DeclsToCheckForDeferredDiags.push_back(GetDeclRef(D));

RecordData DeclUpdatesOffsetsRecord;

// Keep writing types, declarations, and declaration update records
// until we've emitted all of them.
Stream.EnterSubblock(DECLTYPES_BLOCK_ID, /*bits for abbreviations*/5);
DeclTypesBlockStartOffset = Stream.GetCurrentBitNo();
WriteTypeAbbrevs();
WriteDeclAbbrevs();
do {
  WriteDeclUpdatesBlocks(DeclUpdatesOffsetsRecord);
  while (!DeclTypesToEmit.empty()) {
    DeclOrType DOT = DeclTypesToEmit.front();
    DeclTypesToEmit.pop();
    if (DOT.isType())
      WriteType(DOT.getType());
    else
      WriteDecl(Context, DOT.getDecl());
  }
} while (!DeclUpdates.empty());
Stream.ExitBlock();

DoneWritingDeclsAndTypes = true;

// These things can only be done once we've written out decls and types.
WriteTypeDeclOffsets();
if (!DeclUpdatesOffsetsRecord.empty())
  Stream.EmitRecord(DECL_UPDATE_OFFSETS, DeclUpdatesOffsetsRecord);
WriteFileDeclIDsMap();
WriteSourceManagerBlock(Context.getSourceManager(), PP);
WriteComments();
WritePreprocessor(PP, isModule);
WriteHeaderSearch(PP.getHeaderSearchInfo());
WriteSelectors(SemaRef);
WriteReferencedSelectorsPool(SemaRef);
WriteLateParsedTemplates(SemaRef);
WriteIdentifierTable(PP, SemaRef.IdResolver, isModule);
WriteFPPragmaOptions(SemaRef.CurFPFeatureOverrides());
WriteOpenCLExtensions(SemaRef);
WriteCUDAPragmas(SemaRef);

// If we're emitting a module, write out the submodule information.
if (WritingModule)
  WriteSubmodules(WritingModule);

Stream.EmitRecord(SPECIAL_TYPES, SpecialTypes);

// Write the record containing external, unnamed definitions.
if (!EagerlyDeserializedDecls.empty())
  Stream.EmitRecord(EAGERLY_DESERIALIZED_DECLS, EagerlyDeserializedDecls);

if (!ModularCodegenDecls.empty())
  Stream.EmitRecord(MODULAR_CODEGEN_DECLS, ModularCodegenDecls);

// Write the record containing tentative definitions.
if (!TentativeDefinitions.empty())
  Stream.EmitRecord(TENTATIVE_DEFINITIONS, TentativeDefinitions);

// Write the record containing unused file scoped decls.
if (!UnusedFileScopedDecls.empty())
  Stream.EmitRecord(UNUSED_FILESCOPED_DECLS, UnusedFileScopedDecls);

// Write the record containing weak undeclared identifiers.
if (!WeakUndeclaredIdentifiers.empty())
  Stream.EmitRecord(WEAK_UNDECLARED_IDENTIFIERS,
                    WeakUndeclaredIdentifiers);

// Write the record containing ext_vector type names.
if (!ExtVectorDecls.empty())
  Stream.EmitRecord(EXT_VECTOR_DECLS, ExtVectorDecls);

// Write the record containing VTable uses information.
if (!VTableUses.empty())
  Stream.EmitRecord(VTABLE_USES, VTableUses);

// Write the record containing potentially unused local typedefs.
if (!UnusedLocalTypedefNameCandidates.empty())
  Stream.EmitRecord(UNUSED_LOCAL_TYPEDEF_NAME_CANDIDATES,
                    UnusedLocalTypedefNameCandidates);

// Write the record containing pending implicit instantiations.
if (!PendingInstantiations.empty())
  Stream.EmitRecord(PENDING_IMPLICIT_INSTANTIATIONS, PendingInstantiations);

// Write the record containing declaration references of Sema.
if (!SemaDeclRefs.empty())
  Stream.EmitRecord(SEMA_DECL_REFS, SemaDeclRefs);

// Write the record containing decls to be checked for deferred diags.
if (!DeclsToCheckForDeferredDiags.empty())
  Stream.EmitRecord(DECLS_TO_CHECK_FOR_DEFERRED_DIAGS,
      DeclsToCheckForDeferredDiags);

// Write the record containing CUDA-specific declaration references.
if (!CUDASpecialDeclRefs.empty())
  Stream.EmitRecord(CUDA_SPECIAL_DECL_REFS, CUDASpecialDeclRefs);

// Write the delegating constructors.
if (!DelegatingCtorDecls.empty())
  Stream.EmitRecord(DELEGATING_CTORS, DelegatingCtorDecls);

// Write the known namespaces.
if (!KnownNamespaces.empty())
  Stream.EmitRecord(KNOWN_NAMESPACES, KnownNamespaces);

// Write the undefined internal functions and variables, and inline functions.
if (!UndefinedButUsed.empty())
  Stream.EmitRecord(UNDEFINED_BUT_USED, UndefinedButUsed);

if (!DeleteExprsToAnalyze.empty())
  Stream.EmitRecord(DELETE_EXPRS_TO_ANALYZE, DeleteExprsToAnalyze);

// Write the visible updates to DeclContexts.
for (auto *DC : UpdatedDeclContexts)
  WriteDeclContextVisibleUpdate(DC);

if (!WritingModule) {
  // Write the submodules that were imported, if any.
  struct ModuleInfo {
    uint64_t ID;
    Module *M;
    ModuleInfo(uint64_t ID, Module *M) : ID(ID), M(M) {}
  };
  llvm::SmallVector<ModuleInfo, 64> Imports;
  for (const auto *I : Context.local_imports()) {
    assert(SubmoduleIDs.find(I->getImportedModule()) != SubmoduleIDs.end())(static_cast <bool> (SubmoduleIDs.find(I->getImportedModule
()) != SubmoduleIDs.end()) ? void (0) : __assert_fail ("SubmoduleIDs.find(I->getImportedModule()) != SubmoduleIDs.end()"
, "clang/lib/Serialization/ASTWriter.cpp", 5102, __extension__
 __PRETTY_FUNCTION__));
    Imports.push_back(ModuleInfo(SubmoduleIDs[I->getImportedModule()],
                       I->getImportedModule()));
  }

  if (!Imports.empty()) {
    auto Cmp = [](const ModuleInfo &A, const ModuleInfo &B) {
      return A.ID < B.ID;
    };
    auto Eq = [](const ModuleInfo &A, const ModuleInfo &B) {
      return A.ID == B.ID;
    };

    // Sort and deduplicate module IDs.
    llvm::sort(Imports, Cmp);
    Imports.erase(std::unique(Imports.begin(), Imports.end(), Eq),
                  Imports.end());

    RecordData ImportedModules;
    for (const auto &Import : Imports) {
      ImportedModules.push_back(Import.ID);
      // FIXME: If the module has macros imported then later has declarations
      // imported, this location won't be the right one as a location for the
      // declaration imports.
      AddSourceLocation(PP.getModuleImportLoc(Import.M), ImportedModules);
    }

    Stream.EmitRecord(IMPORTED_MODULES, ImportedModules);
  }
}

WriteObjCCategories();
if(!WritingModule) {
  WriteOptimizePragmaOptions(SemaRef);
  WriteMSStructPragmaOptions(SemaRef);
  WriteMSPointersToMembersPragmaOptions(SemaRef);
}
WritePackPragmaOptions(SemaRef);
WriteFloatControlPragmaOptions(SemaRef);

// Some simple statistics
RecordData::value_type Record[] = {
    NumStatements, NumMacros, NumLexicalDeclContexts, NumVisibleDeclContexts};
Stream.EmitRecord(STATISTICS, Record);
Stream.ExitBlock();
Stream.FlushToWord();
ASTBlockRange.second = Stream.GetCurrentBitNo();

// Write the module file extension blocks.
for (const auto &ExtWriter : ModuleFileExtensionWriters)
  WriteModuleFileExtension(SemaRef, *ExtWriter);

return writeUnhashedControlBlock(PP, Context);
5155}

5157void ASTWriter::WriteDeclUpdatesBlocks(RecordDataImpl &OffsetsRecord) {
if (DeclUpdates.empty())
  return;

DeclUpdateMap LocalUpdates;
LocalUpdates.swap(DeclUpdates);

for (auto &DeclUpdate : LocalUpdates) {
  const Decl *D = DeclUpdate.first;

  bool HasUpdatedBody = false;
  RecordData RecordData;
  ASTRecordWriter Record(*this, RecordData);
  for (auto &Update : DeclUpdate.second) {
    DeclUpdateKind Kind = (DeclUpdateKind)Update.getKind();

    // An updated body is emitted last, so that the reader doesn't need
    // to skip over the lazy body to reach statements for other records.
    if (Kind == UPD_CXX_ADDED_FUNCTION_DEFINITION)
      HasUpdatedBody = true;
    else
      Record.push_back(Kind);

    switch (Kind) {
    case UPD_CXX_ADDED_IMPLICIT_MEMBER:
    case UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION:
    case UPD_CXX_ADDED_ANONYMOUS_NAMESPACE:
      assert(Update.getDecl() && "no decl to add?")(static_cast <bool> (Update.getDecl() && "no decl to add?"
) ? void (0) : __assert_fail ("Update.getDecl() && \"no decl to add?\""
, "clang/lib/Serialization/ASTWriter.cpp", 5184, __extension__
 __PRETTY_FUNCTION__));
      Record.push_back(GetDeclRef(Update.getDecl()));
      break;

    case UPD_CXX_ADDED_FUNCTION_DEFINITION:
      break;

    case UPD_CXX_POINT_OF_INSTANTIATION:
      // FIXME: Do we need to also save the template specialization kind here?
      Record.AddSourceLocation(Update.getLoc());
      break;

    case UPD_CXX_ADDED_VAR_DEFINITION: {
      const VarDecl *VD = cast<VarDecl>(D);
      Record.push_back(VD->isInline());
      Record.push_back(VD->isInlineSpecified());
      Record.AddVarDeclInit(VD);
      break;
    }

    case UPD_CXX_INSTANTIATED_DEFAULT_ARGUMENT:
      Record.AddStmt(const_cast<Expr *>(
          cast<ParmVarDecl>(Update.getDecl())->getDefaultArg()));
      break;

    case UPD_CXX_INSTANTIATED_DEFAULT_MEMBER_INITIALIZER:
      Record.AddStmt(
          cast<FieldDecl>(Update.getDecl())->getInClassInitializer());
      break;

    case UPD_CXX_INSTANTIATED_CLASS_DEFINITION: {
      auto *RD = cast<CXXRecordDecl>(D);
      UpdatedDeclContexts.insert(RD->getPrimaryContext());
      Record.push_back(RD->isParamDestroyedInCallee());
      Record.push_back(RD->getArgPassingRestrictions());
      Record.AddCXXDefinitionData(RD);
      Record.AddOffset(WriteDeclContextLexicalBlock(
          *Context, const_cast<CXXRecordDecl *>(RD)));

      // This state is sometimes updated by template instantiation, when we
      // switch from the specialization referring to the template declaration
      // to it referring to the template definition.
      if (auto *MSInfo = RD->getMemberSpecializationInfo()) {
        Record.push_back(MSInfo->getTemplateSpecializationKind());
        Record.AddSourceLocation(MSInfo->getPointOfInstantiation());
      } else {
        auto *Spec = cast<ClassTemplateSpecializationDecl>(RD);
        Record.push_back(Spec->getTemplateSpecializationKind());
        Record.AddSourceLocation(Spec->getPointOfInstantiation());

        // The instantiation might have been resolved to a partial
        // specialization. If so, record which one.
        auto From = Spec->getInstantiatedFrom();
        if (auto PartialSpec =
              From.dyn_cast<ClassTemplatePartialSpecializationDecl*>()) {
          Record.push_back(true);
          Record.AddDeclRef(PartialSpec);
          Record.AddTemplateArgumentList(
              &Spec->getTemplateInstantiationArgs());
        } else {
          Record.push_back(false);
        }
      }
      Record.push_back(RD->getTagKind());
      Record.AddSourceLocation(RD->getLocation());
      Record.AddSourceLocation(RD->getBeginLoc());
      Record.AddSourceRange(RD->getBraceRange());

      // Instantiation may change attributes; write them all out afresh.
      Record.push_back(D->hasAttrs());
      if (D->hasAttrs())
        Record.AddAttributes(D->getAttrs());

      // FIXME: Ensure we don't get here for explicit instantiations.
      break;
    }

    case UPD_CXX_RESOLVED_DTOR_DELETE:
      Record.AddDeclRef(Update.getDecl());
      Record.AddStmt(cast<CXXDestructorDecl>(D)->getOperatorDeleteThisArg());
      break;

    case UPD_CXX_RESOLVED_EXCEPTION_SPEC: {
      auto prototype =
        cast<FunctionDecl>(D)->getType()->castAs<FunctionProtoType>();
      Record.writeExceptionSpecInfo(prototype->getExceptionSpecInfo());
      break;
    }

    case UPD_CXX_DEDUCED_RETURN_TYPE:
      Record.push_back(GetOrCreateTypeID(Update.getType()));
      break;

    case UPD_DECL_MARKED_USED:
      break;

    case UPD_MANGLING_NUMBER:
    case UPD_STATIC_LOCAL_NUMBER:
      Record.push_back(Update.getNumber());
      break;

    case UPD_DECL_MARKED_OPENMP_THREADPRIVATE:
      Record.AddSourceRange(
          D->getAttr<OMPThreadPrivateDeclAttr>()->getRange());
      break;

    case UPD_DECL_MARKED_OPENMP_ALLOCATE: {
      auto *A = D->getAttr<OMPAllocateDeclAttr>();
      Record.push_back(A->getAllocatorType());
      Record.AddStmt(A->getAllocator());
      Record.AddStmt(A->getAlignment());
      Record.AddSourceRange(A->getRange());
      break;
    }

    case UPD_DECL_MARKED_OPENMP_DECLARETARGET:
      Record.push_back(D->getAttr<OMPDeclareTargetDeclAttr>()->getMapType());
      Record.AddSourceRange(
          D->getAttr<OMPDeclareTargetDeclAttr>()->getRange());
      break;

    case UPD_DECL_EXPORTED:
      Record.push_back(getSubmoduleID(Update.getModule()));
      break;

    case UPD_ADDED_ATTR_TO_RECORD:
      Record.AddAttributes(llvm::makeArrayRef(Update.getAttr()));
      break;
    }
  }

  if (HasUpdatedBody) {
    const auto *Def = cast<FunctionDecl>(D);
    Record.push_back(UPD_CXX_ADDED_FUNCTION_DEFINITION);
    Record.push_back(Def->isInlined());
    Record.AddSourceLocation(Def->getInnerLocStart());
    Record.AddFunctionDefinition(Def);
  }

  OffsetsRecord.push_back(GetDeclRef(D));
  OffsetsRecord.push_back(Record.Emit(DECL_UPDATES));
}
5326}

5328void ASTWriter::AddAlignPackInfo(const Sema::AlignPackInfo &Info,
                               RecordDataImpl &Record) {
uint32_t Raw = Sema::AlignPackInfo::getRawEncoding(Info);
Record.push_back(Raw);
5332}

5334FileID ASTWriter::getAdjustedFileID(FileID FID) const {
if (FID.isInvalid() || PP->getSourceManager().isLoadedFileID(FID) ||
    NonAffectingFileIDs.empty())
  return FID;
auto It = llvm::lower_bound(NonAffectingFileIDs, FID);
unsigned Idx = std::distance(NonAffectingFileIDs.begin(), It);
unsigned Offset = NonAffectingFileIDAdjustments[Idx];
return FileID::get(FID.getOpaqueValue() - Offset);
5342}

5344unsigned ASTWriter::getAdjustedNumCreatedFIDs(FileID FID) const {
unsigned NumCreatedFIDs = PP->getSourceManager()
                              .getLocalSLocEntry(FID.ID)
                              .getFile()
                              .NumCreatedFIDs;

unsigned AdjustedNumCreatedFIDs = 0;
for (unsigned I = FID.ID, N = I + NumCreatedFIDs; I != N; ++I)
  if (IsSLocAffecting[I])
    ++AdjustedNumCreatedFIDs;
return AdjustedNumCreatedFIDs;
5355}

5357SourceLocation ASTWriter::getAdjustedLocation(SourceLocation Loc) const {
if (Loc.isInvalid())
  return Loc;
return Loc.getLocWithOffset(-getAdjustment(Loc.getOffset()));
5361}

5363SourceRange ASTWriter::getAdjustedRange(SourceRange Range) const {
return SourceRange(getAdjustedLocation(Range.getBegin()),
                   getAdjustedLocation(Range.getEnd()));
5366}

5368SourceLocation::UIntTy
5369ASTWriter::getAdjustedOffset(SourceLocation::UIntTy Offset) const {
return Offset - getAdjustment(Offset);
5371}

5373SourceLocation::UIntTy
5374ASTWriter::getAdjustment(SourceLocation::UIntTy Offset) const {
if (NonAffectingRanges.empty())
  return 0;

if (PP->getSourceManager().isLoadedOffset(Offset))
  return 0;

if (Offset > NonAffectingRanges.back().getEnd().getOffset())
  return NonAffectingOffsetAdjustments.back();

if (Offset < NonAffectingRanges.front().getBegin().getOffset())
  return 0;

auto Contains = [](const SourceRange &Range, SourceLocation::UIntTy Offset) {
  return Range.getEnd().getOffset() < Offset;
};

auto It = llvm::lower_bound(NonAffectingRanges, Offset, Contains);
unsigned Idx = std::distance(NonAffectingRanges.begin(), It);
return NonAffectingOffsetAdjustments[Idx];
5394}

5396void ASTWriter::AddFileID(FileID FID, RecordDataImpl &Record) {
Record.push_back(getAdjustedFileID(FID).getOpaqueValue());
5398}

5400void ASTWriter::AddSourceLocation(SourceLocation Loc, RecordDataImpl &Record,
                                SourceLocationSequence *Seq) {
Loc = getAdjustedLocation(Loc);
Record.push_back(SourceLocationEncoding::encode(Loc, Seq));
5404}

5406void ASTWriter::AddSourceRange(SourceRange Range, RecordDataImpl &Record,
                             SourceLocationSequence *Seq) {
AddSourceLocation(Range.getBegin(), Record, Seq);
AddSourceLocation(Range.getEnd(), Record, Seq);
5410}

5412void ASTRecordWriter::AddAPFloat(const llvm::APFloat &Value) {
AddAPInt(Value.bitcastToAPInt());
5414}

5416void ASTWriter::AddIdentifierRef(const IdentifierInfo *II, RecordDataImpl &Record) {
Record.push_back(getIdentifierRef(II));
5418}

5420IdentID ASTWriter::getIdentifierRef(const IdentifierInfo *II) {
if (!II)
  return 0;

IdentID &ID = IdentifierIDs[II];
if (ID == 0)
  ID = NextIdentID++;
return ID;
5428}

5430MacroID ASTWriter::getMacroRef(MacroInfo *MI, const IdentifierInfo *Name) {
// Don't emit builtin macros like __LINE__ to the AST file unless they
// have been redefined by the header (in which case they are not
// isBuiltinMacro).
if (!MI || MI->isBuiltinMacro())
  return 0;

MacroID &ID = MacroIDs[MI];
if (ID == 0) {
  ID = NextMacroID++;
  MacroInfoToEmitData Info = { Name, MI, ID };
  MacroInfosToEmit.push_back(Info);
}
return ID;
5444}

5446MacroID ASTWriter::getMacroID(MacroInfo *MI) {
if (!MI || MI->isBuiltinMacro())
  return 0;

assert(MacroIDs.find(MI) != MacroIDs.end() && "Macro not emitted!")(static_cast <bool> (MacroIDs.find(MI) != MacroIDs.end(
) && "Macro not emitted!") ? void (0) : __assert_fail
 ("MacroIDs.find(MI) != MacroIDs.end() && \"Macro not emitted!\""
, "clang/lib/Serialization/ASTWriter.cpp", 5450, __extension__
 __PRETTY_FUNCTION__));
return MacroIDs[MI];
5452}

5454uint32_t ASTWriter::getMacroDirectivesOffset(const IdentifierInfo *Name) {
return IdentMacroDirectivesOffsetMap.lookup(Name);
5456}

5458void ASTRecordWriter::AddSelectorRef(const Selector SelRef) {
Record->push_back(Writer->getSelectorRef(SelRef));
5460}

5462SelectorID ASTWriter::getSelectorRef(Selector Sel) {
if (Sel.getAsOpaquePtr() == nullptr) {
  return 0;
}

SelectorID SID = SelectorIDs[Sel];
if (SID == 0 && Chain) {
  // This might trigger a ReadSelector callback, which will set the ID for
  // this selector.
  Chain->LoadSelector(Sel);
  SID = SelectorIDs[Sel];
}
if (SID == 0) {
  SID = NextSelectorID++;
  SelectorIDs[Sel] = SID;
}
return SID;
5479}

5481void ASTRecordWriter::AddCXXTemporary(const CXXTemporary *Temp) {
AddDeclRef(Temp->getDestructor());
5483}

5485void ASTRecordWriter::AddTemplateArgumentLocInfo(
  TemplateArgument::ArgKind Kind, const TemplateArgumentLocInfo &Arg) {
switch (Kind) {
case TemplateArgument::Expression:
  AddStmt(Arg.getAsExpr());
  break;
case TemplateArgument::Type:
  AddTypeSourceInfo(Arg.getAsTypeSourceInfo());
  break;
case TemplateArgument::Template:
  AddNestedNameSpecifierLoc(Arg.getTemplateQualifierLoc());
  AddSourceLocation(Arg.getTemplateNameLoc());
  break;
case TemplateArgument::TemplateExpansion:
  AddNestedNameSpecifierLoc(Arg.getTemplateQualifierLoc());
  AddSourceLocation(Arg.getTemplateNameLoc());
  AddSourceLocation(Arg.getTemplateEllipsisLoc());
  break;
case TemplateArgument::Null:
case TemplateArgument::Integral:
case TemplateArgument::Declaration:
case TemplateArgument::NullPtr:
case TemplateArgument::Pack:
  // FIXME: Is this right?
  break;
}
5511}

5513void ASTRecordWriter::AddTemplateArgumentLoc(const TemplateArgumentLoc &Arg) {
AddTemplateArgument(Arg.getArgument());

if (Arg.getArgument().getKind() == TemplateArgument::Expression) {
  bool InfoHasSameExpr
    = Arg.getArgument().getAsExpr() == Arg.getLocInfo().getAsExpr();
  Record->push_back(InfoHasSameExpr);
  if (InfoHasSameExpr)
    return; // Avoid storing the same expr twice.
}
AddTemplateArgumentLocInfo(Arg.getArgument().getKind(), Arg.getLocInfo());
5524}

5526void ASTRecordWriter::AddTypeSourceInfo(TypeSourceInfo *TInfo) {
if (!TInfo) {
  AddTypeRef(QualType());
  return;
}

AddTypeRef(TInfo->getType());
AddTypeLoc(TInfo->getTypeLoc());
5534}

5536void ASTRecordWriter::AddTypeLoc(TypeLoc TL, LocSeq *OuterSeq) {
LocSeq::State Seq(OuterSeq);
TypeLocWriter TLW(*this, Seq);
for (; !TL.isNull(); TL = TL.getNextTypeLoc())
  TLW.Visit(TL);
5541}

5543void ASTWriter::AddTypeRef(QualType T, RecordDataImpl &Record) {
Record.push_back(GetOrCreateTypeID(T));
5545}

5547TypeID ASTWriter::GetOrCreateTypeID(QualType T) {
assert(Context)(static_cast <bool> (Context) ? void (0) : __assert_fail
 ("Context", "clang/lib/Serialization/ASTWriter.cpp", 5548, __extension__
 __PRETTY_FUNCTION__));
return MakeTypeID(*Context, T, [&](QualType T) -> TypeIdx {
  if (T.isNull())
    return TypeIdx();
  assert(!T.getLocalFastQualifiers())(static_cast <bool> (!T.getLocalFastQualifiers()) ? void
 (0) : __assert_fail ("!T.getLocalFastQualifiers()", "clang/lib/Serialization/ASTWriter.cpp"
, 5552, __extension__ __PRETTY_FUNCTION__));

  TypeIdx &Idx = TypeIdxs[T];
  if (Idx.getIndex() == 0) {
    if (DoneWritingDeclsAndTypes) {
      assert(0 && "New type seen after serializing all the types to emit!")(static_cast <bool> (0 && "New type seen after serializing all the types to emit!"
) ? void (0) : __assert_fail ("0 && \"New type seen after serializing all the types to emit!\""
, "clang/lib/Serialization/ASTWriter.cpp", 5557, __extension__
 __PRETTY_FUNCTION__));
      return TypeIdx();
    }

    // We haven't seen this type before. Assign it a new ID and put it
    // into the queue of types to emit.
    Idx = TypeIdx(NextTypeID++);
    DeclTypesToEmit.push(T);
  }
  return Idx;
});
5568}

5570TypeID ASTWriter::getTypeID(QualType T) const {
assert(Context)(static_cast <bool> (Context) ? void (0) : __assert_fail
 ("Context", "clang/lib/Serialization/ASTWriter.cpp", 5571, __extension__
 __PRETTY_FUNCTION__));
return MakeTypeID(*Context, T, [&](QualType T) -> TypeIdx {
  if (T.isNull())
    return TypeIdx();
  assert(!T.getLocalFastQualifiers())(static_cast <bool> (!T.getLocalFastQualifiers()) ? void
 (0) : __assert_fail ("!T.getLocalFastQualifiers()", "clang/lib/Serialization/ASTWriter.cpp"
, 5575, __extension__ __PRETTY_FUNCTION__));

  TypeIdxMap::const_iterator I = TypeIdxs.find(T);
  assert(I != TypeIdxs.end() && "Type not emitted!")(static_cast <bool> (I != TypeIdxs.end() && "Type not emitted!"
) ? void (0) : __assert_fail ("I != TypeIdxs.end() && \"Type not emitted!\""
, "clang/lib/Serialization/ASTWriter.cpp", 5578, __extension__
 __PRETTY_FUNCTION__));
  return I->second;
});
5581}

5583void ASTWriter::AddDeclRef(const Decl *D, RecordDataImpl &Record) {
Record.push_back(GetDeclRef(D));
5585}

5587DeclID ASTWriter::GetDeclRef(const Decl *D) {
assert(WritingAST && "Cannot request a declaration ID before AST writing")(static_cast <bool> (WritingAST && "Cannot request a declaration ID before AST writing"
) ? void (0) : __assert_fail ("WritingAST && \"Cannot request a declaration ID before AST writing\""
, "clang/lib/Serialization/ASTWriter.cpp", 5588, __extension__
 __PRETTY_FUNCTION__));

if (!D) {
  return 0;
}

// If D comes from an AST file, its declaration ID is already known and
// fixed.
if (D->isFromASTFile())
  return D->getGlobalID();

assert(!(reinterpret_cast<uintptr_t>(D) & 0x01) && "Invalid decl pointer")(static_cast <bool> (!(reinterpret_cast<uintptr_t>
(D) & 0x01) && "Invalid decl pointer") ? void (0)
 : __assert_fail ("!(reinterpret_cast<uintptr_t>(D) & 0x01) && \"Invalid decl pointer\""
, "clang/lib/Serialization/ASTWriter.cpp", 5599, __extension__
 __PRETTY_FUNCTION__));
DeclID &ID = DeclIDs[D];
if (ID == 0) {
  if (DoneWritingDeclsAndTypes) {
    assert(0 && "New decl seen after serializing all the decls to emit!")(static_cast <bool> (0 && "New decl seen after serializing all the decls to emit!"
) ? void (0) : __assert_fail ("0 && \"New decl seen after serializing all the decls to emit!\""
, "clang/lib/Serialization/ASTWriter.cpp", 5603, __extension__
 __PRETTY_FUNCTION__));
    return 0;
  }

  // We haven't seen this declaration before. Give it a new ID and
  // enqueue it in the list of declarations to emit.
  ID = NextDeclID++;
  DeclTypesToEmit.push(const_cast<Decl *>(D));
}

return ID;
5614}

5616DeclID ASTWriter::getDeclID(const Decl *D) {
if (!D)
  return 0;

// If D comes from an AST file, its declaration ID is already known and
// fixed.
if (D->isFromASTFile())
  return D->getGlobalID();

assert(DeclIDs.find(D) != DeclIDs.end() && "Declaration not emitted!")(static_cast <bool> (DeclIDs.find(D) != DeclIDs.end() &&
 "Declaration not emitted!") ? void (0) : __assert_fail ("DeclIDs.find(D) != DeclIDs.end() && \"Declaration not emitted!\""
, "clang/lib/Serialization/ASTWriter.cpp", 5625, __extension__
 __PRETTY_FUNCTION__));
return DeclIDs[D];
5627}

5629void ASTWriter::associateDeclWithFile(const Decl *D, DeclID ID) {
assert(ID)(static_cast <bool> (ID) ? void (0) : __assert_fail ("ID"
, "clang/lib/Serialization/ASTWriter.cpp", 5630, __extension__
 __PRETTY_FUNCTION__));
assert(D)(static_cast <bool> (D) ? void (0) : __assert_fail ("D"
, "clang/lib/Serialization/ASTWriter.cpp", 5631, __extension__
 __PRETTY_FUNCTION__));

SourceLocation Loc = D->getLocation();
if (Loc.isInvalid())
  return;

// We only keep track of the file-level declarations of each file.
if (!D->getLexicalDeclContext()->isFileContext())
  return;
// FIXME: ParmVarDecls that are part of a function type of a parameter of
// a function/objc method, should not have TU as lexical context.
// TemplateTemplateParmDecls that are part of an alias template, should not
// have TU as lexical context.
if (isa<ParmVarDecl, TemplateTemplateParmDecl>(D))
  return;

SourceManager &SM = Context->getSourceManager();
SourceLocation FileLoc = SM.getFileLoc(Loc);
assert(SM.isLocalSourceLocation(FileLoc))(static_cast <bool> (SM.isLocalSourceLocation(FileLoc))
 ? void (0) : __assert_fail ("SM.isLocalSourceLocation(FileLoc)"
, "clang/lib/Serialization/ASTWriter.cpp", 5649, __extension__
 __PRETTY_FUNCTION__));
FileID FID;
unsigned Offset;
std::tie(FID, Offset) = SM.getDecomposedLoc(FileLoc);
if (FID.isInvalid())
  return;
assert(SM.getSLocEntry(FID).isFile())(static_cast <bool> (SM.getSLocEntry(FID).isFile()) ? void
 (0) : __assert_fail ("SM.getSLocEntry(FID).isFile()", "clang/lib/Serialization/ASTWriter.cpp"
, 5655, __extension__ __PRETTY_FUNCTION__));
assert(IsSLocAffecting[FID.ID])(static_cast <bool> (IsSLocAffecting[FID.ID]) ? void (0
) : __assert_fail ("IsSLocAffecting[FID.ID]", "clang/lib/Serialization/ASTWriter.cpp"
, 5656, __extension__ __PRETTY_FUNCTION__));

std::unique_ptr<DeclIDInFileInfo> &Info = FileDeclIDs[FID];
if (!Info)
  Info = std::make_unique<DeclIDInFileInfo>();

std::pair<unsigned, serialization::DeclID> LocDecl(Offset, ID);
LocDeclIDsTy &Decls = Info->DeclIDs;
Decls.push_back(LocDecl);
5665}

5667unsigned ASTWriter::getAnonymousDeclarationNumber(const NamedDecl *D) {
assert(needsAnonymousDeclarationNumber(D) &&(static_cast <bool> (needsAnonymousDeclarationNumber(D)
 && "expected an anonymous declaration") ? void (0) :
 __assert_fail ("needsAnonymousDeclarationNumber(D) && \"expected an anonymous declaration\""
, "clang/lib/Serialization/ASTWriter.cpp", 5669, __extension__
 __PRETTY_FUNCTION__))
       "expected an anonymous declaration")(static_cast <bool> (needsAnonymousDeclarationNumber(D)
 && "expected an anonymous declaration") ? void (0) :
 __assert_fail ("needsAnonymousDeclarationNumber(D) && \"expected an anonymous declaration\""
, "clang/lib/Serialization/ASTWriter.cpp", 5669, __extension__
 __PRETTY_FUNCTION__));

// Number the anonymous declarations within this context, if we've not
// already done so.
auto It = AnonymousDeclarationNumbers.find(D);
if (It == AnonymousDeclarationNumbers.end()) {
  auto *DC = D->getLexicalDeclContext();
  numberAnonymousDeclsWithin(DC, [&](const NamedDecl *ND, unsigned Number) {
    AnonymousDeclarationNumbers[ND] = Number;
  });

  It = AnonymousDeclarationNumbers.find(D);
  assert(It != AnonymousDeclarationNumbers.end() &&(static_cast <bool> (It != AnonymousDeclarationNumbers.
end() && "declaration not found within its lexical context"
) ? void (0) : __assert_fail ("It != AnonymousDeclarationNumbers.end() && \"declaration not found within its lexical context\""
, "clang/lib/Serialization/ASTWriter.cpp", 5682, __extension__
 __PRETTY_FUNCTION__))
         "declaration not found within its lexical context")(static_cast <bool> (It != AnonymousDeclarationNumbers.
end() && "declaration not found within its lexical context"
) ? void (0) : __assert_fail ("It != AnonymousDeclarationNumbers.end() && \"declaration not found within its lexical context\""
, "clang/lib/Serialization/ASTWriter.cpp", 5682, __extension__
 __PRETTY_FUNCTION__));
}

return It->second;
5686}

5688void ASTRecordWriter::AddDeclarationNameLoc(const DeclarationNameLoc &DNLoc,
                                          DeclarationName Name) {
switch (Name.getNameKind()) {
case DeclarationName::CXXConstructorName:
case DeclarationName::CXXDestructorName:
case DeclarationName::CXXConversionFunctionName:
  AddTypeSourceInfo(DNLoc.getNamedTypeInfo());
  break;

case DeclarationName::CXXOperatorName:
  AddSourceRange(DNLoc.getCXXOperatorNameRange());
  break;

case DeclarationName::CXXLiteralOperatorName:
  AddSourceLocation(DNLoc.getCXXLiteralOperatorNameLoc());
  break;

case DeclarationName::Identifier:
case DeclarationName::ObjCZeroArgSelector:
case DeclarationName::ObjCOneArgSelector:
case DeclarationName::ObjCMultiArgSelector:
case DeclarationName::CXXUsingDirective:
case DeclarationName::CXXDeductionGuideName:
  break;
}
5713}

5715void ASTRecordWriter::AddDeclarationNameInfo(
  const DeclarationNameInfo &NameInfo) {
AddDeclarationName(NameInfo.getName());
AddSourceLocation(NameInfo.getLoc());
AddDeclarationNameLoc(NameInfo.getInfo(), NameInfo.getName());
5720}

5722void ASTRecordWriter::AddQualifierInfo(const QualifierInfo &Info) {
AddNestedNameSpecifierLoc(Info.QualifierLoc);
Record->push_back(Info.NumTemplParamLists);
for (unsigned i = 0, e = Info.NumTemplParamLists; i != e; ++i)
  AddTemplateParameterList(Info.TemplParamLists[i]);
5727}

5729void ASTRecordWriter::AddNestedNameSpecifierLoc(NestedNameSpecifierLoc NNS) {
// Nested name specifiers usually aren't too long. I think that 8 would
// typically accommodate the vast majority.
SmallVector<NestedNameSpecifierLoc , 8> NestedNames;

// Push each of the nested-name-specifiers's onto a stack for
// serialization in reverse order.
while (NNS) {
  NestedNames.push_back(NNS);
  NNS = NNS.getPrefix();
}

Record->push_back(NestedNames.size());
while(!NestedNames.empty()) {
  NNS = NestedNames.pop_back_val();
  NestedNameSpecifier::SpecifierKind Kind
    = NNS.getNestedNameSpecifier()->getKind();
  Record->push_back(Kind);
  switch (Kind) {
  case NestedNameSpecifier::Identifier:
    AddIdentifierRef(NNS.getNestedNameSpecifier()->getAsIdentifier());
    AddSourceRange(NNS.getLocalSourceRange());
    break;

  case NestedNameSpecifier::Namespace:
    AddDeclRef(NNS.getNestedNameSpecifier()->getAsNamespace());
    AddSourceRange(NNS.getLocalSourceRange());
    break;

  case NestedNameSpecifier::NamespaceAlias:
    AddDeclRef(NNS.getNestedNameSpecifier()->getAsNamespaceAlias());
    AddSourceRange(NNS.getLocalSourceRange());
    break;

  case NestedNameSpecifier::TypeSpec:
  case NestedNameSpecifier::TypeSpecWithTemplate:
    Record->push_back(Kind == NestedNameSpecifier::TypeSpecWithTemplate);
    AddTypeRef(NNS.getTypeLoc().getType());
    AddTypeLoc(NNS.getTypeLoc());
    AddSourceLocation(NNS.getLocalSourceRange().getEnd());
    break;

  case NestedNameSpecifier::Global:
    AddSourceLocation(NNS.getLocalSourceRange().getEnd());
    break;

  case NestedNameSpecifier::Super:
    AddDeclRef(NNS.getNestedNameSpecifier()->getAsRecordDecl());
    AddSourceRange(NNS.getLocalSourceRange());
    break;
  }
}
5781}

5783void ASTRecordWriter::AddTemplateParameterList(
  const TemplateParameterList *TemplateParams) {
assert(TemplateParams && "No TemplateParams!")(static_cast <bool> (TemplateParams && "No TemplateParams!"
) ? void (0) : __assert_fail ("TemplateParams && \"No TemplateParams!\""
, "clang/lib/Serialization/ASTWriter.cpp", 5785, __extension__
 __PRETTY_FUNCTION__));
AddSourceLocation(TemplateParams->getTemplateLoc());
AddSourceLocation(TemplateParams->getLAngleLoc());
AddSourceLocation(TemplateParams->getRAngleLoc());

Record->push_back(TemplateParams->size());
for (const auto &P : *TemplateParams)
  AddDeclRef(P);
if (const Expr *RequiresClause = TemplateParams->getRequiresClause()) {
  Record->push_back(true);
  AddStmt(const_cast<Expr*>(RequiresClause));
} else {
  Record->push_back(false);
}
5799}

5801/// Emit a template argument list.
5802void ASTRecordWriter::AddTemplateArgumentList(
  const TemplateArgumentList *TemplateArgs) {
assert(TemplateArgs && "No TemplateArgs!")(static_cast <bool> (TemplateArgs && "No TemplateArgs!"
) ? void (0) : __assert_fail ("TemplateArgs && \"No TemplateArgs!\""
, "clang/lib/Serialization/ASTWriter.cpp", 5804, __extension__
 __PRETTY_FUNCTION__));
Record->push_back(TemplateArgs->size());
for (int i = 0, e = TemplateArgs->size(); i != e; ++i)
  AddTemplateArgument(TemplateArgs->get(i));
5808}

5810void ASTRecordWriter::AddASTTemplateArgumentListInfo(
  const ASTTemplateArgumentListInfo *ASTTemplArgList) {
assert(ASTTemplArgList && "No ASTTemplArgList!")(static_cast <bool> (ASTTemplArgList && "No ASTTemplArgList!"
) ? void (0) : __assert_fail ("ASTTemplArgList && \"No ASTTemplArgList!\""
, "clang/lib/Serialization/ASTWriter.cpp", 5812, __extension__
 __PRETTY_FUNCTION__));
AddSourceLocation(ASTTemplArgList->LAngleLoc);
AddSourceLocation(ASTTemplArgList->RAngleLoc);
Record->push_back(ASTTemplArgList->NumTemplateArgs);
const TemplateArgumentLoc *TemplArgs = ASTTemplArgList->getTemplateArgs();
for (int i = 0, e = ASTTemplArgList->NumTemplateArgs; i != e; ++i)
  AddTemplateArgumentLoc(TemplArgs[i]);
5819}

5821void ASTRecordWriter::AddUnresolvedSet(const ASTUnresolvedSet &Set) {
Record->push_back(Set.size());
for (ASTUnresolvedSet::const_iterator
       I = Set.begin(), E = Set.end(); I != E; ++I) {
  AddDeclRef(I.getDecl());
  Record->push_back(I.getAccess());
}
5828}

5830// FIXME: Move this out of the main ASTRecordWriter interface.
5831void ASTRecordWriter::AddCXXBaseSpecifier(const CXXBaseSpecifier &Base) {
Record->push_back(Base.isVirtual());
Record->push_back(Base.isBaseOfClass());
Record->push_back(Base.getAccessSpecifierAsWritten());
Record->push_back(Base.getInheritConstructors());
AddTypeSourceInfo(Base.getTypeSourceInfo());
AddSourceRange(Base.getSourceRange());
AddSourceLocation(Base.isPackExpansion()? Base.getEllipsisLoc()
                                        : SourceLocation());
5840}

5842static uint64_t EmitCXXBaseSpecifiers(ASTWriter &W,
                                    ArrayRef<CXXBaseSpecifier> Bases) {
ASTWriter::RecordData Record;
ASTRecordWriter Writer(W, Record);
Writer.push_back(Bases.size());

for (auto &Base : Bases)
  Writer.AddCXXBaseSpecifier(Base);

return Writer.Emit(serialization::DECL_CXX_BASE_SPECIFIERS);
5852}

5854// FIXME: Move this out of the main ASTRecordWriter interface.
5855void ASTRecordWriter::AddCXXBaseSpecifiers(ArrayRef<CXXBaseSpecifier> Bases) {
AddOffset(EmitCXXBaseSpecifiers(*Writer, Bases));
5857}

5859static uint64_t
5860EmitCXXCtorInitializers(ASTWriter &W,
                      ArrayRef<CXXCtorInitializer *> CtorInits) {
ASTWriter::RecordData Record;
ASTRecordWriter Writer(W, Record);
Writer.push_back(CtorInits.size());

for (auto *Init : CtorInits) {
  if (Init->isBaseInitializer()) {
    Writer.push_back(CTOR_INITIALIZER_BASE);
    Writer.AddTypeSourceInfo(Init->getTypeSourceInfo());
    Writer.push_back(Init->isBaseVirtual());
  } else if (Init->isDelegatingInitializer()) {
    Writer.push_back(CTOR_INITIALIZER_DELEGATING);
    Writer.AddTypeSourceInfo(Init->getTypeSourceInfo());
  } else if (Init->isMemberInitializer()){
    Writer.push_back(CTOR_INITIALIZER_MEMBER);
    Writer.AddDeclRef(Init->getMember());
  } else {
    Writer.push_back(CTOR_INITIALIZER_INDIRECT_MEMBER);
    Writer.AddDeclRef(Init->getIndirectMember());
  }

  Writer.AddSourceLocation(Init->getMemberLocation());
  Writer.AddStmt(Init->getInit());
  Writer.AddSourceLocation(Init->getLParenLoc());
  Writer.AddSourceLocation(Init->getRParenLoc());
  Writer.push_back(Init->isWritten());
  if (Init->isWritten())
    Writer.push_back(Init->getSourceOrder());
}

return Writer.Emit(serialization::DECL_CXX_CTOR_INITIALIZERS);
5892}

5894// FIXME: Move this out of the main ASTRecordWriter interface.
5895void ASTRecordWriter::AddCXXCtorInitializers(
  ArrayRef<CXXCtorInitializer *> CtorInits) {
AddOffset(EmitCXXCtorInitializers(*Writer, CtorInits));
5898}

5900void ASTRecordWriter::AddCXXDefinitionData(const CXXRecordDecl *D) {
auto &Data = D->data();
Record->push_back(Data.IsLambda);

#define FIELD(Name, Width, Merge) \
Record->push_back(Data.Name);
#include "clang/AST/CXXRecordDeclDefinitionBits.def"

// getODRHash will compute the ODRHash if it has not been previously computed.
Record->push_back(D->getODRHash());
bool ModulesDebugInfo =
    Writer->Context->getLangOpts().ModulesDebugInfo && !D->isDependentType();
Record->push_back(ModulesDebugInfo);
if (ModulesDebugInfo)
  Writer->ModularCodegenDecls.push_back(Writer->GetDeclRef(D));

// IsLambda bit is already saved.

Record->push_back(Data.NumBases);
if (Data.NumBases > 0)
  AddCXXBaseSpecifiers(Data.bases());

// FIXME: Make VBases lazily computed when needed to avoid storing them.
Record->push_back(Data.NumVBases);
if (Data.NumVBases > 0)
  AddCXXBaseSpecifiers(Data.vbases());

AddUnresolvedSet(Data.Conversions.get(*Writer->Context));
Record->push_back(Data.ComputedVisibleConversions);
if (Data.ComputedVisibleConversions)
  AddUnresolvedSet(Data.VisibleConversions.get(*Writer->Context));
// Data.Definition is the owning decl, no need to write it.
AddDeclRef(D->getFirstFriend());

// Add lambda-specific data.
if (Data.IsLambda) {
  auto &Lambda = D->getLambdaData();
  Record->push_back(Lambda.DependencyKind);
  Record->push_back(Lambda.IsGenericLambda);
  Record->push_back(Lambda.CaptureDefault);
  Record->push_back(Lambda.NumCaptures);
  Record->push_back(Lambda.NumExplicitCaptures);
  Record->push_back(Lambda.HasKnownInternalLinkage);
  Record->push_back(Lambda.ManglingNumber);
  Record->push_back(D->getDeviceLambdaManglingNumber());
  AddDeclRef(D->getLambdaContextDecl());
  AddTypeSourceInfo(Lambda.MethodTyInfo);
  for (unsigned I = 0, N = Lambda.NumCaptures; I != N; ++I) {
    const LambdaCapture &Capture = Lambda.Captures.front()[I];
    AddSourceLocation(Capture.getLocation());
    Record->push_back(Capture.isImplicit());
    Record->push_back(Capture.getCaptureKind());
    switch (Capture.getCaptureKind()) {
    case LCK_StarThis:
    case LCK_This:
    case LCK_VLAType:
      break;
    case LCK_ByCopy:
    case LCK_ByRef:
      ValueDecl *Var =
          Capture.capturesVariable() ? Capture.getCapturedVar() : nullptr;
      AddDeclRef(Var);
      AddSourceLocation(Capture.isPackExpansion() ? Capture.getEllipsisLoc()
                                                  : SourceLocation());
      break;
    }
  }
}
5968}

5970void ASTRecordWriter::AddVarDeclInit(const VarDecl *VD) {
const Expr *Init = VD->getInit();
if (!Init) {
  push_back(0);
  return;
}

unsigned Val = 1;
if (EvaluatedStmt *ES = VD->getEvaluatedStmt()) {
  Val |= (ES->HasConstantInitialization ? 2 : 0);
  Val |= (ES->HasConstantDestruction ? 4 : 0);
  // FIXME: Also emit the constant initializer value.
}
push_back(Val);
writeStmtRef(Init);
5985}

5987void ASTWriter::ReaderInitialized(ASTReader *Reader) {
assert(Reader && "Cannot remove chain")(static_cast <bool> (Reader && "Cannot remove chain"
) ? void (0) : __assert_fail ("Reader && \"Cannot remove chain\""
, "clang/lib/Serialization/ASTWriter.cpp", 5988, __extension__
 __PRETTY_FUNCTION__));
assert((!Chain || Chain == Reader) && "Cannot replace chain")(static_cast <bool> ((!Chain || Chain == Reader) &&
 "Cannot replace chain") ? void (0) : __assert_fail ("(!Chain || Chain == Reader) && \"Cannot replace chain\""
, "clang/lib/Serialization/ASTWriter.cpp", 5989, __extension__
 __PRETTY_FUNCTION__));
assert(FirstDeclID == NextDeclID &&(static_cast <bool> (FirstDeclID == NextDeclID &&
 FirstTypeID == NextTypeID && FirstIdentID == NextIdentID
 && FirstMacroID == NextMacroID && FirstSubmoduleID
 == NextSubmoduleID && FirstSelectorID == NextSelectorID
 && "Setting chain after writing has started.") ? void
 (0) : __assert_fail ("FirstDeclID == NextDeclID && FirstTypeID == NextTypeID && FirstIdentID == NextIdentID && FirstMacroID == NextMacroID && FirstSubmoduleID == NextSubmoduleID && FirstSelectorID == NextSelectorID && \"Setting chain after writing has started.\""
, "clang/lib/Serialization/ASTWriter.cpp", 5996, __extension__
 __PRETTY_FUNCTION__))
       FirstTypeID == NextTypeID &&(static_cast <bool> (FirstDeclID == NextDeclID &&
 FirstTypeID == NextTypeID && FirstIdentID == NextIdentID
 && FirstMacroID == NextMacroID && FirstSubmoduleID
 == NextSubmoduleID && FirstSelectorID == NextSelectorID
 && "Setting chain after writing has started.") ? void
 (0) : __assert_fail ("FirstDeclID == NextDeclID && FirstTypeID == NextTypeID && FirstIdentID == NextIdentID && FirstMacroID == NextMacroID && FirstSubmoduleID == NextSubmoduleID && FirstSelectorID == NextSelectorID && \"Setting chain after writing has started.\""
, "clang/lib/Serialization/ASTWriter.cpp", 5996, __extension__
 __PRETTY_FUNCTION__))
       FirstIdentID == NextIdentID &&(static_cast <bool> (FirstDeclID == NextDeclID &&
 FirstTypeID == NextTypeID && FirstIdentID == NextIdentID
 && FirstMacroID == NextMacroID && FirstSubmoduleID
 == NextSubmoduleID && FirstSelectorID == NextSelectorID
 && "Setting chain after writing has started.") ? void
 (0) : __assert_fail ("FirstDeclID == NextDeclID && FirstTypeID == NextTypeID && FirstIdentID == NextIdentID && FirstMacroID == NextMacroID && FirstSubmoduleID == NextSubmoduleID && FirstSelectorID == NextSelectorID && \"Setting chain after writing has started.\""
, "clang/lib/Serialization/ASTWriter.cpp", 5996, __extension__
 __PRETTY_FUNCTION__))
       FirstMacroID == NextMacroID &&(static_cast <bool> (FirstDeclID == NextDeclID &&
 FirstTypeID == NextTypeID && FirstIdentID == NextIdentID
 && FirstMacroID == NextMacroID && FirstSubmoduleID
 == NextSubmoduleID && FirstSelectorID == NextSelectorID
 && "Setting chain after writing has started.") ? void
 (0) : __assert_fail ("FirstDeclID == NextDeclID && FirstTypeID == NextTypeID && FirstIdentID == NextIdentID && FirstMacroID == NextMacroID && FirstSubmoduleID == NextSubmoduleID && FirstSelectorID == NextSelectorID && \"Setting chain after writing has started.\""
, "clang/lib/Serialization/ASTWriter.cpp", 5996, __extension__
 __PRETTY_FUNCTION__))
       FirstSubmoduleID == NextSubmoduleID &&(static_cast <bool> (FirstDeclID == NextDeclID &&
 FirstTypeID == NextTypeID && FirstIdentID == NextIdentID
 && FirstMacroID == NextMacroID && FirstSubmoduleID
 == NextSubmoduleID && FirstSelectorID == NextSelectorID
 && "Setting chain after writing has started.") ? void
 (0) : __assert_fail ("FirstDeclID == NextDeclID && FirstTypeID == NextTypeID && FirstIdentID == NextIdentID && FirstMacroID == NextMacroID && FirstSubmoduleID == NextSubmoduleID && FirstSelectorID == NextSelectorID && \"Setting chain after writing has started.\""
, "clang/lib/Serialization/ASTWriter.cpp", 5996, __extension__
 __PRETTY_FUNCTION__))
       FirstSelectorID == NextSelectorID &&(static_cast <bool> (FirstDeclID == NextDeclID &&
 FirstTypeID == NextTypeID && FirstIdentID == NextIdentID
 && FirstMacroID == NextMacroID && FirstSubmoduleID
 == NextSubmoduleID && FirstSelectorID == NextSelectorID
 && "Setting chain after writing has started.") ? void
 (0) : __assert_fail ("FirstDeclID == NextDeclID && FirstTypeID == NextTypeID && FirstIdentID == NextIdentID && FirstMacroID == NextMacroID && FirstSubmoduleID == NextSubmoduleID && FirstSelectorID == NextSelectorID && \"Setting chain after writing has started.\""
, "clang/lib/Serialization/ASTWriter.cpp", 5996, __extension__
 __PRETTY_FUNCTION__))
       "Setting chain after writing has started.")(static_cast <bool> (FirstDeclID == NextDeclID &&
 FirstTypeID == NextTypeID && FirstIdentID == NextIdentID
 && FirstMacroID == NextMacroID && FirstSubmoduleID
 == NextSubmoduleID && FirstSelectorID == NextSelectorID
 && "Setting chain after writing has started.") ? void
 (0) : __assert_fail ("FirstDeclID == NextDeclID && FirstTypeID == NextTypeID && FirstIdentID == NextIdentID && FirstMacroID == NextMacroID && FirstSubmoduleID == NextSubmoduleID && FirstSelectorID == NextSelectorID && \"Setting chain after writing has started.\""
, "clang/lib/Serialization/ASTWriter.cpp", 5996, __extension__
 __PRETTY_FUNCTION__));

Chain = Reader;

// Note, this will get called multiple times, once one the reader starts up
// and again each time it's done reading a PCH or module.
FirstDeclID = NUM_PREDEF_DECL_IDS + Chain->getTotalNumDecls();
FirstTypeID = NUM_PREDEF_TYPE_IDS + Chain->getTotalNumTypes();
FirstIdentID = NUM_PREDEF_IDENT_IDS + Chain->getTotalNumIdentifiers();
FirstMacroID = NUM_PREDEF_MACRO_IDS + Chain->getTotalNumMacros();
FirstSubmoduleID = NUM_PREDEF_SUBMODULE_IDS + Chain->getTotalNumSubmodules();
FirstSelectorID = NUM_PREDEF_SELECTOR_IDS + Chain->getTotalNumSelectors();
NextDeclID = FirstDeclID;
NextTypeID = FirstTypeID;
NextIdentID = FirstIdentID;
NextMacroID = FirstMacroID;
NextSelectorID = FirstSelectorID;
NextSubmoduleID = FirstSubmoduleID;
6014}

6016void ASTWriter::IdentifierRead(IdentID ID, IdentifierInfo *II) {
// Always keep the highest ID. See \p TypeRead() for more information.
IdentID &StoredID = IdentifierIDs[II];
if (ID > StoredID)
  StoredID = ID;
6021}

6023void ASTWriter::MacroRead(serialization::MacroID ID, MacroInfo *MI) {
// Always keep the highest ID. See \p TypeRead() for more information.
MacroID &StoredID = MacroIDs[MI];
if (ID > StoredID)
  StoredID = ID;
6028}

6030void ASTWriter::TypeRead(TypeIdx Idx, QualType T) {
// Always take the highest-numbered type index. This copes with an interesting
// case for chained AST writing where we schedule writing the type and then,
// later, deserialize the type from another AST. In this case, we want to
// keep the higher-numbered entry so that we can properly write it out to
// the AST file.
TypeIdx &StoredIdx = TypeIdxs[T];
if (Idx.getIndex() >= StoredIdx.getIndex())
  StoredIdx = Idx;
6039}

6041void ASTWriter::SelectorRead(SelectorID ID, Selector S) {
// Always keep the highest ID. See \p TypeRead() for more information.
SelectorID &StoredID = SelectorIDs[S];
if (ID > StoredID)
  StoredID = ID;
6046}

6048void ASTWriter::MacroDefinitionRead(serialization::PreprocessedEntityID ID,
                                  MacroDefinitionRecord *MD) {
assert(MacroDefinitions.find(MD) == MacroDefinitions.end())(static_cast <bool> (MacroDefinitions.find(MD) == MacroDefinitions
.end()) ? void (0) : __assert_fail ("MacroDefinitions.find(MD) == MacroDefinitions.end()"
, "clang/lib/Serialization/ASTWriter.cpp", 6050, __extension__
 __PRETTY_FUNCTION__));
MacroDefinitions[MD] = ID;
6052}

6054void ASTWriter::ModuleRead(serialization::SubmoduleID ID, Module *Mod) {
assert(SubmoduleIDs.find(Mod) == SubmoduleIDs.end())(static_cast <bool> (SubmoduleIDs.find(Mod) == SubmoduleIDs
.end()) ? void (0) : __assert_fail ("SubmoduleIDs.find(Mod) == SubmoduleIDs.end()"
, "clang/lib/Serialization/ASTWriter.cpp", 6055, __extension__
 __PRETTY_FUNCTION__));
SubmoduleIDs[Mod] = ID;
6057}

6059void ASTWriter::CompletedTagDefinition(const TagDecl *D) {
if (Chain && Chain->isProcessingUpdateRecords()) return;
assert(D->isCompleteDefinition())(static_cast <bool> (D->isCompleteDefinition()) ? void
 (0) : __assert_fail ("D->isCompleteDefinition()", "clang/lib/Serialization/ASTWriter.cpp"
, 6061, __extension__ __PRETTY_FUNCTION__));
assert(!WritingAST && "Already writing the AST!")(static_cast <bool> (!WritingAST && "Already writing the AST!"
) ? void (0) : __assert_fail ("!WritingAST && \"Already writing the AST!\""
, "clang/lib/Serialization/ASTWriter.cpp", 6062, __extension__
 __PRETTY_FUNCTION__));
if (auto *RD = dyn_cast<CXXRecordDecl>(D)) {
  // We are interested when a PCH decl is modified.
  if (RD->isFromASTFile()) {
    // A forward reference was mutated into a definition. Rewrite it.
    // FIXME: This happens during template instantiation, should we
    // have created a new definition decl instead ?
    assert(isTemplateInstantiation(RD->getTemplateSpecializationKind()) &&(static_cast <bool> (isTemplateInstantiation(RD->getTemplateSpecializationKind
()) && "completed a tag from another module but not by instantiation?"
) ? void (0) : __assert_fail ("isTemplateInstantiation(RD->getTemplateSpecializationKind()) && \"completed a tag from another module but not by instantiation?\""
, "clang/lib/Serialization/ASTWriter.cpp", 6070, __extension__
 __PRETTY_FUNCTION__))
           "completed a tag from another module but not by instantiation?")(static_cast <bool> (isTemplateInstantiation(RD->getTemplateSpecializationKind
()) && "completed a tag from another module but not by instantiation?"
) ? void (0) : __assert_fail ("isTemplateInstantiation(RD->getTemplateSpecializationKind()) && \"completed a tag from another module but not by instantiation?\""
, "clang/lib/Serialization/ASTWriter.cpp", 6070, __extension__
 __PRETTY_FUNCTION__));
    DeclUpdates[RD].push_back(
        DeclUpdate(UPD_CXX_INSTANTIATED_CLASS_DEFINITION));
  }
}
6075}

6077static bool isImportedDeclContext(ASTReader *Chain, const Decl *D) {
if (D->isFromASTFile())
  return true;

// The predefined __va_list_tag struct is imported if we imported any decls.
// FIXME: This is a gross hack.
return D == D->getASTContext().getVaListTagDecl();
6084}

6086void ASTWriter::AddedVisibleDecl(const DeclContext *DC, const Decl *D) {
if (Chain && Chain->isProcessingUpdateRecords()) return;
assert(DC->isLookupContext() &&(static_cast <bool> (DC->isLookupContext() &&
 "Should not add lookup results to non-lookup contexts!") ? void
 (0) : __assert_fail ("DC->isLookupContext() && \"Should not add lookup results to non-lookup contexts!\""
, "clang/lib/Serialization/ASTWriter.cpp", 6089, __extension__
 __PRETTY_FUNCTION__))
        "Should not add lookup results to non-lookup contexts!")(static_cast <bool> (DC->isLookupContext() &&
 "Should not add lookup results to non-lookup contexts!") ? void
 (0) : __assert_fail ("DC->isLookupContext() && \"Should not add lookup results to non-lookup contexts!\""
, "clang/lib/Serialization/ASTWriter.cpp", 6089, __extension__
 __PRETTY_FUNCTION__));

// TU is handled elsewhere.
if (isa<TranslationUnitDecl>(DC))
  return;

// Namespaces are handled elsewhere, except for template instantiations of
// FunctionTemplateDecls in namespaces. We are interested in cases where the
// local instantiations are added to an imported context. Only happens when
// adding ADL lookup candidates, for example templated friends.
if (isa<NamespaceDecl>(DC) && D->getFriendObjectKind() == Decl::FOK_None &&
    !isa<FunctionTemplateDecl>(D))
  return;

// We're only interested in cases where a local declaration is added to an
// imported context.
if (D->isFromASTFile() || !isImportedDeclContext(Chain, cast<Decl>(DC)))
  return;

assert(DC == DC->getPrimaryContext() && "added to non-primary context")(static_cast <bool> (DC == DC->getPrimaryContext() &&
 "added to non-primary context") ? void (0) : __assert_fail (
"DC == DC->getPrimaryContext() && \"added to non-primary context\""
, "clang/lib/Serialization/ASTWriter.cpp", 6108, __extension__
 __PRETTY_FUNCTION__));
assert(!getDefinitiveDeclContext(DC) && "DeclContext not definitive!")(static_cast <bool> (!getDefinitiveDeclContext(DC) &&
 "DeclContext not definitive!") ? void (0) : __assert_fail ("!getDefinitiveDeclContext(DC) && \"DeclContext not definitive!\""
, "clang/lib/Serialization/ASTWriter.cpp", 6109, __extension__
 __PRETTY_FUNCTION__));
assert(!WritingAST && "Already writing the AST!")(static_cast <bool> (!WritingAST && "Already writing the AST!"
) ? void (0) : __assert_fail ("!WritingAST && \"Already writing the AST!\""
, "clang/lib/Serialization/ASTWriter.cpp", 6110, __extension__
 __PRETTY_FUNCTION__));
if (UpdatedDeclContexts.insert(DC) && !cast<Decl>(DC)->isFromASTFile()) {
  // We're adding a visible declaration to a predefined decl context. Ensure
  // that we write out all of its lookup results so we don't get a nasty
  // surprise when we try to emit its lookup table.
  llvm::append_range(DeclsToEmitEvenIfUnreferenced, DC->decls());
}
DeclsToEmitEvenIfUnreferenced.push_back(D);
6118}

6120void ASTWriter::AddedCXXImplicitMember(const CXXRecordDecl *RD, const Decl *D) {
if (Chain && Chain->isProcessingUpdateRecords()) return;