xref: /freebsd/contrib/llvm-project/clang/lib/Serialization/ASTWriter.cpp (revision 85868e8a1daeaae7a0e48effb2ea2310ae3b02c6)
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 //===----------------------------------------------------------------------===//
12 
13 #include "clang/Serialization/ASTWriter.h"
14 #include "ASTCommon.h"
15 #include "ASTReaderInternals.h"
16 #include "MultiOnDiskHashTable.h"
17 #include "clang/AST/ASTContext.h"
18 #include "clang/AST/ASTUnresolvedSet.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/RawCommentList.h"
33 #include "clang/AST/TemplateName.h"
34 #include "clang/AST/Type.h"
35 #include "clang/AST/TypeLocVisitor.h"
36 #include "clang/Basic/Diagnostic.h"
37 #include "clang/Basic/DiagnosticOptions.h"
38 #include "clang/Basic/FileManager.h"
39 #include "clang/Basic/FileSystemOptions.h"
40 #include "clang/Basic/IdentifierTable.h"
41 #include "clang/Basic/LLVM.h"
42 #include "clang/Basic/Lambda.h"
43 #include "clang/Basic/LangOptions.h"
44 #include "clang/Basic/Module.h"
45 #include "clang/Basic/ObjCRuntime.h"
46 #include "clang/Basic/OpenCLOptions.h"
47 #include "clang/Basic/SourceLocation.h"
48 #include "clang/Basic/SourceManager.h"
49 #include "clang/Basic/SourceManagerInternals.h"
50 #include "clang/Basic/Specifiers.h"
51 #include "clang/Basic/TargetInfo.h"
52 #include "clang/Basic/TargetOptions.h"
53 #include "clang/Basic/Version.h"
54 #include "clang/Lex/HeaderSearch.h"
55 #include "clang/Lex/HeaderSearchOptions.h"
56 #include "clang/Lex/MacroInfo.h"
57 #include "clang/Lex/ModuleMap.h"
58 #include "clang/Lex/PreprocessingRecord.h"
59 #include "clang/Lex/Preprocessor.h"
60 #include "clang/Lex/PreprocessorOptions.h"
61 #include "clang/Lex/Token.h"
62 #include "clang/Sema/IdentifierResolver.h"
63 #include "clang/Sema/ObjCMethodList.h"
64 #include "clang/Sema/Sema.h"
65 #include "clang/Sema/Weak.h"
66 #include "clang/Serialization/ASTReader.h"
67 #include "clang/Serialization/InMemoryModuleCache.h"
68 #include "clang/Serialization/Module.h"
69 #include "clang/Serialization/ModuleFileExtension.h"
70 #include "clang/Serialization/SerializationDiagnostic.h"
71 #include "llvm/ADT/APFloat.h"
72 #include "llvm/ADT/APInt.h"
73 #include "llvm/ADT/APSInt.h"
74 #include "llvm/ADT/ArrayRef.h"
75 #include "llvm/ADT/DenseMap.h"
76 #include "llvm/ADT/Hashing.h"
77 #include "llvm/ADT/Optional.h"
78 #include "llvm/ADT/PointerIntPair.h"
79 #include "llvm/ADT/STLExtras.h"
80 #include "llvm/ADT/ScopeExit.h"
81 #include "llvm/ADT/SmallSet.h"
82 #include "llvm/ADT/SmallString.h"
83 #include "llvm/ADT/SmallVector.h"
84 #include "llvm/ADT/StringMap.h"
85 #include "llvm/ADT/StringRef.h"
86 #include "llvm/Bitstream/BitCodes.h"
87 #include "llvm/Bitstream/BitstreamWriter.h"
88 #include "llvm/Support/Casting.h"
89 #include "llvm/Support/Compression.h"
90 #include "llvm/Support/DJB.h"
91 #include "llvm/Support/Endian.h"
92 #include "llvm/Support/EndianStream.h"
93 #include "llvm/Support/Error.h"
94 #include "llvm/Support/ErrorHandling.h"
95 #include "llvm/Support/MemoryBuffer.h"
96 #include "llvm/Support/OnDiskHashTable.h"
97 #include "llvm/Support/Path.h"
98 #include "llvm/Support/SHA1.h"
99 #include "llvm/Support/VersionTuple.h"
100 #include "llvm/Support/raw_ostream.h"
101 #include <algorithm>
102 #include <cassert>
103 #include <cstdint>
104 #include <cstdlib>
105 #include <cstring>
106 #include <ctime>
107 #include <deque>
108 #include <limits>
109 #include <memory>
110 #include <queue>
111 #include <tuple>
112 #include <utility>
113 #include <vector>
114 
115 using namespace clang;
116 using namespace clang::serialization;
117 
118 template <typename T, typename Allocator>
119 static StringRef bytes(const std::vector<T, Allocator> &v) {
120   if (v.empty()) return StringRef();
121   return StringRef(reinterpret_cast<const char*>(&v[0]),
122                          sizeof(T) * v.size());
123 }
124 
125 template <typename T>
126 static StringRef bytes(const SmallVectorImpl<T> &v) {
127   return StringRef(reinterpret_cast<const char*>(v.data()),
128                          sizeof(T) * v.size());
129 }
130 
131 //===----------------------------------------------------------------------===//
132 // Type serialization
133 //===----------------------------------------------------------------------===//
134 
135 namespace clang {
136 
137   class ASTTypeWriter {
138     ASTWriter &Writer;
139     ASTRecordWriter Record;
140 
141     /// Type code that corresponds to the record generated.
142     TypeCode Code = static_cast<TypeCode>(0);
143 
144     /// Abbreviation to use for the record, if any.
145     unsigned AbbrevToUse = 0;
146 
147   public:
148     ASTTypeWriter(ASTWriter &Writer, ASTWriter::RecordDataImpl &Record)
149       : Writer(Writer), Record(Writer, Record) {}
150 
151     uint64_t Emit() {
152       return Record.Emit(Code, AbbrevToUse);
153     }
154 
155     void Visit(QualType T) {
156       if (T.hasLocalNonFastQualifiers()) {
157         Qualifiers Qs = T.getLocalQualifiers();
158         Record.AddTypeRef(T.getLocalUnqualifiedType());
159         Record.push_back(Qs.getAsOpaqueValue());
160         Code = TYPE_EXT_QUAL;
161         AbbrevToUse = Writer.TypeExtQualAbbrev;
162       } else {
163         switch (T->getTypeClass()) {
164           // For all of the concrete, non-dependent types, call the
165           // appropriate visitor function.
166 #define TYPE(Class, Base) \
167         case Type::Class: Visit##Class##Type(cast<Class##Type>(T)); break;
168 #define ABSTRACT_TYPE(Class, Base)
169 #include "clang/AST/TypeNodes.inc"
170         }
171       }
172     }
173 
174     void VisitArrayType(const ArrayType *T);
175     void VisitFunctionType(const FunctionType *T);
176     void VisitTagType(const TagType *T);
177 
178 #define TYPE(Class, Base) void Visit##Class##Type(const Class##Type *T);
179 #define ABSTRACT_TYPE(Class, Base)
180 #include "clang/AST/TypeNodes.inc"
181   };
182 
183 } // namespace clang
184 
185 void ASTTypeWriter::VisitBuiltinType(const BuiltinType *T) {
186   llvm_unreachable("Built-in types are never serialized");
187 }
188 
189 void ASTTypeWriter::VisitComplexType(const ComplexType *T) {
190   Record.AddTypeRef(T->getElementType());
191   Code = TYPE_COMPLEX;
192 }
193 
194 void ASTTypeWriter::VisitPointerType(const PointerType *T) {
195   Record.AddTypeRef(T->getPointeeType());
196   Code = TYPE_POINTER;
197 }
198 
199 void ASTTypeWriter::VisitDecayedType(const DecayedType *T) {
200   Record.AddTypeRef(T->getOriginalType());
201   Code = TYPE_DECAYED;
202 }
203 
204 void ASTTypeWriter::VisitAdjustedType(const AdjustedType *T) {
205   Record.AddTypeRef(T->getOriginalType());
206   Record.AddTypeRef(T->getAdjustedType());
207   Code = TYPE_ADJUSTED;
208 }
209 
210 void ASTTypeWriter::VisitBlockPointerType(const BlockPointerType *T) {
211   Record.AddTypeRef(T->getPointeeType());
212   Code = TYPE_BLOCK_POINTER;
213 }
214 
215 void ASTTypeWriter::VisitLValueReferenceType(const LValueReferenceType *T) {
216   Record.AddTypeRef(T->getPointeeTypeAsWritten());
217   Record.push_back(T->isSpelledAsLValue());
218   Code = TYPE_LVALUE_REFERENCE;
219 }
220 
221 void ASTTypeWriter::VisitRValueReferenceType(const RValueReferenceType *T) {
222   Record.AddTypeRef(T->getPointeeTypeAsWritten());
223   Code = TYPE_RVALUE_REFERENCE;
224 }
225 
226 void ASTTypeWriter::VisitMemberPointerType(const MemberPointerType *T) {
227   Record.AddTypeRef(T->getPointeeType());
228   Record.AddTypeRef(QualType(T->getClass(), 0));
229   Code = TYPE_MEMBER_POINTER;
230 }
231 
232 void ASTTypeWriter::VisitArrayType(const ArrayType *T) {
233   Record.AddTypeRef(T->getElementType());
234   Record.push_back(T->getSizeModifier()); // FIXME: stable values
235   Record.push_back(T->getIndexTypeCVRQualifiers()); // FIXME: stable values
236 }
237 
238 void ASTTypeWriter::VisitConstantArrayType(const ConstantArrayType *T) {
239   VisitArrayType(T);
240   Record.AddAPInt(T->getSize());
241   Record.AddStmt(const_cast<Expr*>(T->getSizeExpr()));
242   Code = TYPE_CONSTANT_ARRAY;
243 }
244 
245 void ASTTypeWriter::VisitIncompleteArrayType(const IncompleteArrayType *T) {
246   VisitArrayType(T);
247   Code = TYPE_INCOMPLETE_ARRAY;
248 }
249 
250 void ASTTypeWriter::VisitVariableArrayType(const VariableArrayType *T) {
251   VisitArrayType(T);
252   Record.AddSourceLocation(T->getLBracketLoc());
253   Record.AddSourceLocation(T->getRBracketLoc());
254   Record.AddStmt(T->getSizeExpr());
255   Code = TYPE_VARIABLE_ARRAY;
256 }
257 
258 void ASTTypeWriter::VisitVectorType(const VectorType *T) {
259   Record.AddTypeRef(T->getElementType());
260   Record.push_back(T->getNumElements());
261   Record.push_back(T->getVectorKind());
262   Code = TYPE_VECTOR;
263 }
264 
265 void ASTTypeWriter::VisitExtVectorType(const ExtVectorType *T) {
266   VisitVectorType(T);
267   Code = TYPE_EXT_VECTOR;
268 }
269 
270 void ASTTypeWriter::VisitFunctionType(const FunctionType *T) {
271   Record.AddTypeRef(T->getReturnType());
272   FunctionType::ExtInfo C = T->getExtInfo();
273   Record.push_back(C.getNoReturn());
274   Record.push_back(C.getHasRegParm());
275   Record.push_back(C.getRegParm());
276   // FIXME: need to stabilize encoding of calling convention...
277   Record.push_back(C.getCC());
278   Record.push_back(C.getProducesResult());
279   Record.push_back(C.getNoCallerSavedRegs());
280   Record.push_back(C.getNoCfCheck());
281 
282   if (C.getHasRegParm() || C.getRegParm() || C.getProducesResult())
283     AbbrevToUse = 0;
284 }
285 
286 void ASTTypeWriter::VisitFunctionNoProtoType(const FunctionNoProtoType *T) {
287   VisitFunctionType(T);
288   Code = TYPE_FUNCTION_NO_PROTO;
289 }
290 
291 static void addExceptionSpec(const FunctionProtoType *T,
292                              ASTRecordWriter &Record) {
293   Record.push_back(T->getExceptionSpecType());
294   if (T->getExceptionSpecType() == EST_Dynamic) {
295     Record.push_back(T->getNumExceptions());
296     for (unsigned I = 0, N = T->getNumExceptions(); I != N; ++I)
297       Record.AddTypeRef(T->getExceptionType(I));
298   } else if (isComputedNoexcept(T->getExceptionSpecType())) {
299     Record.AddStmt(T->getNoexceptExpr());
300   } else if (T->getExceptionSpecType() == EST_Uninstantiated) {
301     Record.AddDeclRef(T->getExceptionSpecDecl());
302     Record.AddDeclRef(T->getExceptionSpecTemplate());
303   } else if (T->getExceptionSpecType() == EST_Unevaluated) {
304     Record.AddDeclRef(T->getExceptionSpecDecl());
305   }
306 }
307 
308 void ASTTypeWriter::VisitFunctionProtoType(const FunctionProtoType *T) {
309   VisitFunctionType(T);
310 
311   Record.push_back(T->isVariadic());
312   Record.push_back(T->hasTrailingReturn());
313   Record.push_back(T->getMethodQuals().getAsOpaqueValue());
314   Record.push_back(static_cast<unsigned>(T->getRefQualifier()));
315   addExceptionSpec(T, Record);
316 
317   Record.push_back(T->getNumParams());
318   for (unsigned I = 0, N = T->getNumParams(); I != N; ++I)
319     Record.AddTypeRef(T->getParamType(I));
320 
321   if (T->hasExtParameterInfos()) {
322     for (unsigned I = 0, N = T->getNumParams(); I != N; ++I)
323       Record.push_back(T->getExtParameterInfo(I).getOpaqueValue());
324   }
325 
326   if (T->isVariadic() || T->hasTrailingReturn() || T->getMethodQuals() ||
327       T->getRefQualifier() || T->getExceptionSpecType() != EST_None ||
328       T->hasExtParameterInfos())
329     AbbrevToUse = 0;
330 
331   Code = TYPE_FUNCTION_PROTO;
332 }
333 
334 void ASTTypeWriter::VisitUnresolvedUsingType(const UnresolvedUsingType *T) {
335   Record.AddDeclRef(T->getDecl());
336   Code = TYPE_UNRESOLVED_USING;
337 }
338 
339 void ASTTypeWriter::VisitTypedefType(const TypedefType *T) {
340   Record.AddDeclRef(T->getDecl());
341   assert(!T->isCanonicalUnqualified() && "Invalid typedef ?");
342   Record.AddTypeRef(T->getCanonicalTypeInternal());
343   Code = TYPE_TYPEDEF;
344 }
345 
346 void ASTTypeWriter::VisitTypeOfExprType(const TypeOfExprType *T) {
347   Record.AddStmt(T->getUnderlyingExpr());
348   Code = TYPE_TYPEOF_EXPR;
349 }
350 
351 void ASTTypeWriter::VisitTypeOfType(const TypeOfType *T) {
352   Record.AddTypeRef(T->getUnderlyingType());
353   Code = TYPE_TYPEOF;
354 }
355 
356 void ASTTypeWriter::VisitDecltypeType(const DecltypeType *T) {
357   Record.AddTypeRef(T->getUnderlyingType());
358   Record.AddStmt(T->getUnderlyingExpr());
359   Code = TYPE_DECLTYPE;
360 }
361 
362 void ASTTypeWriter::VisitUnaryTransformType(const UnaryTransformType *T) {
363   Record.AddTypeRef(T->getBaseType());
364   Record.AddTypeRef(T->getUnderlyingType());
365   Record.push_back(T->getUTTKind());
366   Code = TYPE_UNARY_TRANSFORM;
367 }
368 
369 void ASTTypeWriter::VisitAutoType(const AutoType *T) {
370   Record.AddTypeRef(T->getDeducedType());
371   Record.push_back((unsigned)T->getKeyword());
372   if (T->getDeducedType().isNull())
373     Record.push_back(T->containsUnexpandedParameterPack() ? 2 :
374                      T->isDependentType() ? 1 : 0);
375   Code = TYPE_AUTO;
376 }
377 
378 void ASTTypeWriter::VisitDeducedTemplateSpecializationType(
379     const DeducedTemplateSpecializationType *T) {
380   Record.AddTemplateName(T->getTemplateName());
381   Record.AddTypeRef(T->getDeducedType());
382   if (T->getDeducedType().isNull())
383     Record.push_back(T->isDependentType());
384   Code = TYPE_DEDUCED_TEMPLATE_SPECIALIZATION;
385 }
386 
387 void ASTTypeWriter::VisitTagType(const TagType *T) {
388   Record.push_back(T->isDependentType());
389   Record.AddDeclRef(T->getDecl()->getCanonicalDecl());
390   assert(!T->isBeingDefined() &&
391          "Cannot serialize in the middle of a type definition");
392 }
393 
394 void ASTTypeWriter::VisitRecordType(const RecordType *T) {
395   VisitTagType(T);
396   Code = TYPE_RECORD;
397 }
398 
399 void ASTTypeWriter::VisitEnumType(const EnumType *T) {
400   VisitTagType(T);
401   Code = TYPE_ENUM;
402 }
403 
404 void ASTTypeWriter::VisitAttributedType(const AttributedType *T) {
405   Record.AddTypeRef(T->getModifiedType());
406   Record.AddTypeRef(T->getEquivalentType());
407   Record.push_back(T->getAttrKind());
408   Code = TYPE_ATTRIBUTED;
409 }
410 
411 void
412 ASTTypeWriter::VisitSubstTemplateTypeParmType(
413                                         const SubstTemplateTypeParmType *T) {
414   Record.AddTypeRef(QualType(T->getReplacedParameter(), 0));
415   Record.AddTypeRef(T->getReplacementType());
416   Code = TYPE_SUBST_TEMPLATE_TYPE_PARM;
417 }
418 
419 void
420 ASTTypeWriter::VisitSubstTemplateTypeParmPackType(
421                                       const SubstTemplateTypeParmPackType *T) {
422   Record.AddTypeRef(QualType(T->getReplacedParameter(), 0));
423   Record.AddTemplateArgument(T->getArgumentPack());
424   Code = TYPE_SUBST_TEMPLATE_TYPE_PARM_PACK;
425 }
426 
427 void
428 ASTTypeWriter::VisitTemplateSpecializationType(
429                                        const TemplateSpecializationType *T) {
430   Record.push_back(T->isDependentType());
431   Record.AddTemplateName(T->getTemplateName());
432   Record.push_back(T->getNumArgs());
433   for (const auto &ArgI : *T)
434     Record.AddTemplateArgument(ArgI);
435   Record.AddTypeRef(T->isTypeAlias() ? T->getAliasedType()
436                                      : T->isCanonicalUnqualified()
437                                            ? QualType()
438                                            : T->getCanonicalTypeInternal());
439   Code = TYPE_TEMPLATE_SPECIALIZATION;
440 }
441 
442 void
443 ASTTypeWriter::VisitDependentSizedArrayType(const DependentSizedArrayType *T) {
444   VisitArrayType(T);
445   Record.AddStmt(T->getSizeExpr());
446   Record.AddSourceRange(T->getBracketsRange());
447   Code = TYPE_DEPENDENT_SIZED_ARRAY;
448 }
449 
450 void
451 ASTTypeWriter::VisitDependentSizedExtVectorType(
452                                         const DependentSizedExtVectorType *T) {
453   Record.AddTypeRef(T->getElementType());
454   Record.AddStmt(T->getSizeExpr());
455   Record.AddSourceLocation(T->getAttributeLoc());
456   Code = TYPE_DEPENDENT_SIZED_EXT_VECTOR;
457 }
458 
459 void ASTTypeWriter::VisitDependentVectorType(const DependentVectorType *T) {
460   Record.AddTypeRef(T->getElementType());
461   Record.AddStmt(const_cast<Expr*>(T->getSizeExpr()));
462   Record.AddSourceLocation(T->getAttributeLoc());
463   Record.push_back(T->getVectorKind());
464   Code = TYPE_DEPENDENT_SIZED_VECTOR;
465 }
466 
467 void
468 ASTTypeWriter::VisitDependentAddressSpaceType(
469     const DependentAddressSpaceType *T) {
470   Record.AddTypeRef(T->getPointeeType());
471   Record.AddStmt(T->getAddrSpaceExpr());
472   Record.AddSourceLocation(T->getAttributeLoc());
473   Code = TYPE_DEPENDENT_ADDRESS_SPACE;
474 }
475 
476 void
477 ASTTypeWriter::VisitTemplateTypeParmType(const TemplateTypeParmType *T) {
478   Record.push_back(T->getDepth());
479   Record.push_back(T->getIndex());
480   Record.push_back(T->isParameterPack());
481   Record.AddDeclRef(T->getDecl());
482   Code = TYPE_TEMPLATE_TYPE_PARM;
483 }
484 
485 void
486 ASTTypeWriter::VisitDependentNameType(const DependentNameType *T) {
487   Record.push_back(T->getKeyword());
488   Record.AddNestedNameSpecifier(T->getQualifier());
489   Record.AddIdentifierRef(T->getIdentifier());
490   Record.AddTypeRef(
491       T->isCanonicalUnqualified() ? QualType() : T->getCanonicalTypeInternal());
492   Code = TYPE_DEPENDENT_NAME;
493 }
494 
495 void
496 ASTTypeWriter::VisitDependentTemplateSpecializationType(
497                                 const DependentTemplateSpecializationType *T) {
498   Record.push_back(T->getKeyword());
499   Record.AddNestedNameSpecifier(T->getQualifier());
500   Record.AddIdentifierRef(T->getIdentifier());
501   Record.push_back(T->getNumArgs());
502   for (const auto &I : *T)
503     Record.AddTemplateArgument(I);
504   Code = TYPE_DEPENDENT_TEMPLATE_SPECIALIZATION;
505 }
506 
507 void ASTTypeWriter::VisitPackExpansionType(const PackExpansionType *T) {
508   Record.AddTypeRef(T->getPattern());
509   if (Optional<unsigned> NumExpansions = T->getNumExpansions())
510     Record.push_back(*NumExpansions + 1);
511   else
512     Record.push_back(0);
513   Code = TYPE_PACK_EXPANSION;
514 }
515 
516 void ASTTypeWriter::VisitParenType(const ParenType *T) {
517   Record.AddTypeRef(T->getInnerType());
518   Code = TYPE_PAREN;
519 }
520 
521 void ASTTypeWriter::VisitMacroQualifiedType(const MacroQualifiedType *T) {
522   Record.AddTypeRef(T->getUnderlyingType());
523   Record.AddIdentifierRef(T->getMacroIdentifier());
524   Code = TYPE_MACRO_QUALIFIED;
525 }
526 
527 void ASTTypeWriter::VisitElaboratedType(const ElaboratedType *T) {
528   Record.push_back(T->getKeyword());
529   Record.AddNestedNameSpecifier(T->getQualifier());
530   Record.AddTypeRef(T->getNamedType());
531   Record.AddDeclRef(T->getOwnedTagDecl());
532   Code = TYPE_ELABORATED;
533 }
534 
535 void ASTTypeWriter::VisitInjectedClassNameType(const InjectedClassNameType *T) {
536   Record.AddDeclRef(T->getDecl()->getCanonicalDecl());
537   Record.AddTypeRef(T->getInjectedSpecializationType());
538   Code = TYPE_INJECTED_CLASS_NAME;
539 }
540 
541 void ASTTypeWriter::VisitObjCInterfaceType(const ObjCInterfaceType *T) {
542   Record.AddDeclRef(T->getDecl()->getCanonicalDecl());
543   Code = TYPE_OBJC_INTERFACE;
544 }
545 
546 void ASTTypeWriter::VisitObjCTypeParamType(const ObjCTypeParamType *T) {
547   Record.AddDeclRef(T->getDecl());
548   Record.push_back(T->getNumProtocols());
549   for (const auto *I : T->quals())
550     Record.AddDeclRef(I);
551   Code = TYPE_OBJC_TYPE_PARAM;
552 }
553 
554 void ASTTypeWriter::VisitObjCObjectType(const ObjCObjectType *T) {
555   Record.AddTypeRef(T->getBaseType());
556   Record.push_back(T->getTypeArgsAsWritten().size());
557   for (auto TypeArg : T->getTypeArgsAsWritten())
558     Record.AddTypeRef(TypeArg);
559   Record.push_back(T->getNumProtocols());
560   for (const auto *I : T->quals())
561     Record.AddDeclRef(I);
562   Record.push_back(T->isKindOfTypeAsWritten());
563   Code = TYPE_OBJC_OBJECT;
564 }
565 
566 void
567 ASTTypeWriter::VisitObjCObjectPointerType(const ObjCObjectPointerType *T) {
568   Record.AddTypeRef(T->getPointeeType());
569   Code = TYPE_OBJC_OBJECT_POINTER;
570 }
571 
572 void
573 ASTTypeWriter::VisitAtomicType(const AtomicType *T) {
574   Record.AddTypeRef(T->getValueType());
575   Code = TYPE_ATOMIC;
576 }
577 
578 void
579 ASTTypeWriter::VisitPipeType(const PipeType *T) {
580   Record.AddTypeRef(T->getElementType());
581   Record.push_back(T->isReadOnly());
582   Code = TYPE_PIPE;
583 }
584 
585 namespace {
586 
587 class TypeLocWriter : public TypeLocVisitor<TypeLocWriter> {
588   ASTRecordWriter &Record;
589 
590 public:
591   TypeLocWriter(ASTRecordWriter &Record) : Record(Record) {}
592 
593 #define ABSTRACT_TYPELOC(CLASS, PARENT)
594 #define TYPELOC(CLASS, PARENT) \
595     void Visit##CLASS##TypeLoc(CLASS##TypeLoc TyLoc);
596 #include "clang/AST/TypeLocNodes.def"
597 
598   void VisitArrayTypeLoc(ArrayTypeLoc TyLoc);
599   void VisitFunctionTypeLoc(FunctionTypeLoc TyLoc);
600 };
601 
602 } // namespace
603 
604 void TypeLocWriter::VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
605   // nothing to do
606 }
607 
608 void TypeLocWriter::VisitBuiltinTypeLoc(BuiltinTypeLoc TL) {
609   Record.AddSourceLocation(TL.getBuiltinLoc());
610   if (TL.needsExtraLocalData()) {
611     Record.push_back(TL.getWrittenTypeSpec());
612     Record.push_back(TL.getWrittenSignSpec());
613     Record.push_back(TL.getWrittenWidthSpec());
614     Record.push_back(TL.hasModeAttr());
615   }
616 }
617 
618 void TypeLocWriter::VisitComplexTypeLoc(ComplexTypeLoc TL) {
619   Record.AddSourceLocation(TL.getNameLoc());
620 }
621 
622 void TypeLocWriter::VisitPointerTypeLoc(PointerTypeLoc TL) {
623   Record.AddSourceLocation(TL.getStarLoc());
624 }
625 
626 void TypeLocWriter::VisitDecayedTypeLoc(DecayedTypeLoc TL) {
627   // nothing to do
628 }
629 
630 void TypeLocWriter::VisitAdjustedTypeLoc(AdjustedTypeLoc TL) {
631   // nothing to do
632 }
633 
634 void TypeLocWriter::VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) {
635   Record.AddSourceLocation(TL.getCaretLoc());
636 }
637 
638 void TypeLocWriter::VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) {
639   Record.AddSourceLocation(TL.getAmpLoc());
640 }
641 
642 void TypeLocWriter::VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) {
643   Record.AddSourceLocation(TL.getAmpAmpLoc());
644 }
645 
646 void TypeLocWriter::VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) {
647   Record.AddSourceLocation(TL.getStarLoc());
648   Record.AddTypeSourceInfo(TL.getClassTInfo());
649 }
650 
651 void TypeLocWriter::VisitArrayTypeLoc(ArrayTypeLoc TL) {
652   Record.AddSourceLocation(TL.getLBracketLoc());
653   Record.AddSourceLocation(TL.getRBracketLoc());
654   Record.push_back(TL.getSizeExpr() ? 1 : 0);
655   if (TL.getSizeExpr())
656     Record.AddStmt(TL.getSizeExpr());
657 }
658 
659 void TypeLocWriter::VisitConstantArrayTypeLoc(ConstantArrayTypeLoc TL) {
660   VisitArrayTypeLoc(TL);
661 }
662 
663 void TypeLocWriter::VisitIncompleteArrayTypeLoc(IncompleteArrayTypeLoc TL) {
664   VisitArrayTypeLoc(TL);
665 }
666 
667 void TypeLocWriter::VisitVariableArrayTypeLoc(VariableArrayTypeLoc TL) {
668   VisitArrayTypeLoc(TL);
669 }
670 
671 void TypeLocWriter::VisitDependentSizedArrayTypeLoc(
672                                             DependentSizedArrayTypeLoc TL) {
673   VisitArrayTypeLoc(TL);
674 }
675 
676 void TypeLocWriter::VisitDependentAddressSpaceTypeLoc(
677     DependentAddressSpaceTypeLoc TL) {
678   Record.AddSourceLocation(TL.getAttrNameLoc());
679   SourceRange range = TL.getAttrOperandParensRange();
680   Record.AddSourceLocation(range.getBegin());
681   Record.AddSourceLocation(range.getEnd());
682   Record.AddStmt(TL.getAttrExprOperand());
683 }
684 
685 void TypeLocWriter::VisitDependentSizedExtVectorTypeLoc(
686                                         DependentSizedExtVectorTypeLoc TL) {
687   Record.AddSourceLocation(TL.getNameLoc());
688 }
689 
690 void TypeLocWriter::VisitVectorTypeLoc(VectorTypeLoc TL) {
691   Record.AddSourceLocation(TL.getNameLoc());
692 }
693 
694 void TypeLocWriter::VisitDependentVectorTypeLoc(
695     DependentVectorTypeLoc TL) {
696   Record.AddSourceLocation(TL.getNameLoc());
697 }
698 
699 void TypeLocWriter::VisitExtVectorTypeLoc(ExtVectorTypeLoc TL) {
700   Record.AddSourceLocation(TL.getNameLoc());
701 }
702 
703 void TypeLocWriter::VisitFunctionTypeLoc(FunctionTypeLoc TL) {
704   Record.AddSourceLocation(TL.getLocalRangeBegin());
705   Record.AddSourceLocation(TL.getLParenLoc());
706   Record.AddSourceLocation(TL.getRParenLoc());
707   Record.AddSourceRange(TL.getExceptionSpecRange());
708   Record.AddSourceLocation(TL.getLocalRangeEnd());
709   for (unsigned i = 0, e = TL.getNumParams(); i != e; ++i)
710     Record.AddDeclRef(TL.getParam(i));
711 }
712 
713 void TypeLocWriter::VisitFunctionProtoTypeLoc(FunctionProtoTypeLoc TL) {
714   VisitFunctionTypeLoc(TL);
715 }
716 
717 void TypeLocWriter::VisitFunctionNoProtoTypeLoc(FunctionNoProtoTypeLoc TL) {
718   VisitFunctionTypeLoc(TL);
719 }
720 
721 void TypeLocWriter::VisitUnresolvedUsingTypeLoc(UnresolvedUsingTypeLoc TL) {
722   Record.AddSourceLocation(TL.getNameLoc());
723 }
724 
725 void TypeLocWriter::VisitTypedefTypeLoc(TypedefTypeLoc TL) {
726   Record.AddSourceLocation(TL.getNameLoc());
727 }
728 
729 void TypeLocWriter::VisitObjCTypeParamTypeLoc(ObjCTypeParamTypeLoc TL) {
730   if (TL.getNumProtocols()) {
731     Record.AddSourceLocation(TL.getProtocolLAngleLoc());
732     Record.AddSourceLocation(TL.getProtocolRAngleLoc());
733   }
734   for (unsigned i = 0, e = TL.getNumProtocols(); i != e; ++i)
735     Record.AddSourceLocation(TL.getProtocolLoc(i));
736 }
737 
738 void TypeLocWriter::VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) {
739   Record.AddSourceLocation(TL.getTypeofLoc());
740   Record.AddSourceLocation(TL.getLParenLoc());
741   Record.AddSourceLocation(TL.getRParenLoc());
742 }
743 
744 void TypeLocWriter::VisitTypeOfTypeLoc(TypeOfTypeLoc TL) {
745   Record.AddSourceLocation(TL.getTypeofLoc());
746   Record.AddSourceLocation(TL.getLParenLoc());
747   Record.AddSourceLocation(TL.getRParenLoc());
748   Record.AddTypeSourceInfo(TL.getUnderlyingTInfo());
749 }
750 
751 void TypeLocWriter::VisitDecltypeTypeLoc(DecltypeTypeLoc TL) {
752   Record.AddSourceLocation(TL.getNameLoc());
753 }
754 
755 void TypeLocWriter::VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) {
756   Record.AddSourceLocation(TL.getKWLoc());
757   Record.AddSourceLocation(TL.getLParenLoc());
758   Record.AddSourceLocation(TL.getRParenLoc());
759   Record.AddTypeSourceInfo(TL.getUnderlyingTInfo());
760 }
761 
762 void TypeLocWriter::VisitAutoTypeLoc(AutoTypeLoc TL) {
763   Record.AddSourceLocation(TL.getNameLoc());
764 }
765 
766 void TypeLocWriter::VisitDeducedTemplateSpecializationTypeLoc(
767     DeducedTemplateSpecializationTypeLoc TL) {
768   Record.AddSourceLocation(TL.getTemplateNameLoc());
769 }
770 
771 void TypeLocWriter::VisitRecordTypeLoc(RecordTypeLoc TL) {
772   Record.AddSourceLocation(TL.getNameLoc());
773 }
774 
775 void TypeLocWriter::VisitEnumTypeLoc(EnumTypeLoc TL) {
776   Record.AddSourceLocation(TL.getNameLoc());
777 }
778 
779 void TypeLocWriter::VisitAttributedTypeLoc(AttributedTypeLoc TL) {
780   Record.AddAttr(TL.getAttr());
781 }
782 
783 void TypeLocWriter::VisitTemplateTypeParmTypeLoc(TemplateTypeParmTypeLoc TL) {
784   Record.AddSourceLocation(TL.getNameLoc());
785 }
786 
787 void TypeLocWriter::VisitSubstTemplateTypeParmTypeLoc(
788                                             SubstTemplateTypeParmTypeLoc TL) {
789   Record.AddSourceLocation(TL.getNameLoc());
790 }
791 
792 void TypeLocWriter::VisitSubstTemplateTypeParmPackTypeLoc(
793                                           SubstTemplateTypeParmPackTypeLoc TL) {
794   Record.AddSourceLocation(TL.getNameLoc());
795 }
796 
797 void TypeLocWriter::VisitTemplateSpecializationTypeLoc(
798                                            TemplateSpecializationTypeLoc TL) {
799   Record.AddSourceLocation(TL.getTemplateKeywordLoc());
800   Record.AddSourceLocation(TL.getTemplateNameLoc());
801   Record.AddSourceLocation(TL.getLAngleLoc());
802   Record.AddSourceLocation(TL.getRAngleLoc());
803   for (unsigned i = 0, e = TL.getNumArgs(); i != e; ++i)
804     Record.AddTemplateArgumentLocInfo(TL.getArgLoc(i).getArgument().getKind(),
805                                       TL.getArgLoc(i).getLocInfo());
806 }
807 
808 void TypeLocWriter::VisitParenTypeLoc(ParenTypeLoc TL) {
809   Record.AddSourceLocation(TL.getLParenLoc());
810   Record.AddSourceLocation(TL.getRParenLoc());
811 }
812 
813 void TypeLocWriter::VisitMacroQualifiedTypeLoc(MacroQualifiedTypeLoc TL) {
814   Record.AddSourceLocation(TL.getExpansionLoc());
815 }
816 
817 void TypeLocWriter::VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) {
818   Record.AddSourceLocation(TL.getElaboratedKeywordLoc());
819   Record.AddNestedNameSpecifierLoc(TL.getQualifierLoc());
820 }
821 
822 void TypeLocWriter::VisitInjectedClassNameTypeLoc(InjectedClassNameTypeLoc TL) {
823   Record.AddSourceLocation(TL.getNameLoc());
824 }
825 
826 void TypeLocWriter::VisitDependentNameTypeLoc(DependentNameTypeLoc TL) {
827   Record.AddSourceLocation(TL.getElaboratedKeywordLoc());
828   Record.AddNestedNameSpecifierLoc(TL.getQualifierLoc());
829   Record.AddSourceLocation(TL.getNameLoc());
830 }
831 
832 void TypeLocWriter::VisitDependentTemplateSpecializationTypeLoc(
833        DependentTemplateSpecializationTypeLoc TL) {
834   Record.AddSourceLocation(TL.getElaboratedKeywordLoc());
835   Record.AddNestedNameSpecifierLoc(TL.getQualifierLoc());
836   Record.AddSourceLocation(TL.getTemplateKeywordLoc());
837   Record.AddSourceLocation(TL.getTemplateNameLoc());
838   Record.AddSourceLocation(TL.getLAngleLoc());
839   Record.AddSourceLocation(TL.getRAngleLoc());
840   for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I)
841     Record.AddTemplateArgumentLocInfo(TL.getArgLoc(I).getArgument().getKind(),
842                                       TL.getArgLoc(I).getLocInfo());
843 }
844 
845 void TypeLocWriter::VisitPackExpansionTypeLoc(PackExpansionTypeLoc TL) {
846   Record.AddSourceLocation(TL.getEllipsisLoc());
847 }
848 
849 void TypeLocWriter::VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) {
850   Record.AddSourceLocation(TL.getNameLoc());
851 }
852 
853 void TypeLocWriter::VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) {
854   Record.push_back(TL.hasBaseTypeAsWritten());
855   Record.AddSourceLocation(TL.getTypeArgsLAngleLoc());
856   Record.AddSourceLocation(TL.getTypeArgsRAngleLoc());
857   for (unsigned i = 0, e = TL.getNumTypeArgs(); i != e; ++i)
858     Record.AddTypeSourceInfo(TL.getTypeArgTInfo(i));
859   Record.AddSourceLocation(TL.getProtocolLAngleLoc());
860   Record.AddSourceLocation(TL.getProtocolRAngleLoc());
861   for (unsigned i = 0, e = TL.getNumProtocols(); i != e; ++i)
862     Record.AddSourceLocation(TL.getProtocolLoc(i));
863 }
864 
865 void TypeLocWriter::VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
866   Record.AddSourceLocation(TL.getStarLoc());
867 }
868 
869 void TypeLocWriter::VisitAtomicTypeLoc(AtomicTypeLoc TL) {
870   Record.AddSourceLocation(TL.getKWLoc());
871   Record.AddSourceLocation(TL.getLParenLoc());
872   Record.AddSourceLocation(TL.getRParenLoc());
873 }
874 
875 void TypeLocWriter::VisitPipeTypeLoc(PipeTypeLoc TL) {
876   Record.AddSourceLocation(TL.getKWLoc());
877 }
878 
879 void ASTWriter::WriteTypeAbbrevs() {
880   using namespace llvm;
881 
882   std::shared_ptr<BitCodeAbbrev> Abv;
883 
884   // Abbreviation for TYPE_EXT_QUAL
885   Abv = std::make_shared<BitCodeAbbrev>();
886   Abv->Add(BitCodeAbbrevOp(serialization::TYPE_EXT_QUAL));
887   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // Type
888   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 3));   // Quals
889   TypeExtQualAbbrev = Stream.EmitAbbrev(std::move(Abv));
890 
891   // Abbreviation for TYPE_FUNCTION_PROTO
892   Abv = std::make_shared<BitCodeAbbrev>();
893   Abv->Add(BitCodeAbbrevOp(serialization::TYPE_FUNCTION_PROTO));
894   // FunctionType
895   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // ReturnType
896   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // NoReturn
897   Abv->Add(BitCodeAbbrevOp(0));                         // HasRegParm
898   Abv->Add(BitCodeAbbrevOp(0));                         // RegParm
899   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // CC
900   Abv->Add(BitCodeAbbrevOp(0));                         // ProducesResult
901   Abv->Add(BitCodeAbbrevOp(0));                         // NoCallerSavedRegs
902   Abv->Add(BitCodeAbbrevOp(0));                         // NoCfCheck
903   // FunctionProtoType
904   Abv->Add(BitCodeAbbrevOp(0));                         // IsVariadic
905   Abv->Add(BitCodeAbbrevOp(0));                         // HasTrailingReturn
906   Abv->Add(BitCodeAbbrevOp(0));                         // TypeQuals
907   Abv->Add(BitCodeAbbrevOp(0));                         // RefQualifier
908   Abv->Add(BitCodeAbbrevOp(EST_None));                  // ExceptionSpec
909   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // NumParams
910   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
911   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // Params
912   TypeFunctionProtoAbbrev = Stream.EmitAbbrev(std::move(Abv));
913 }
914 
915 //===----------------------------------------------------------------------===//
916 // ASTWriter Implementation
917 //===----------------------------------------------------------------------===//
918 
919 static void EmitBlockID(unsigned ID, const char *Name,
920                         llvm::BitstreamWriter &Stream,
921                         ASTWriter::RecordDataImpl &Record) {
922   Record.clear();
923   Record.push_back(ID);
924   Stream.EmitRecord(llvm::bitc::BLOCKINFO_CODE_SETBID, Record);
925 
926   // Emit the block name if present.
927   if (!Name || Name[0] == 0)
928     return;
929   Record.clear();
930   while (*Name)
931     Record.push_back(*Name++);
932   Stream.EmitRecord(llvm::bitc::BLOCKINFO_CODE_BLOCKNAME, Record);
933 }
934 
935 static void EmitRecordID(unsigned ID, const char *Name,
936                          llvm::BitstreamWriter &Stream,
937                          ASTWriter::RecordDataImpl &Record) {
938   Record.clear();
939   Record.push_back(ID);
940   while (*Name)
941     Record.push_back(*Name++);
942   Stream.EmitRecord(llvm::bitc::BLOCKINFO_CODE_SETRECORDNAME, Record);
943 }
944 
945 static void AddStmtsExprs(llvm::BitstreamWriter &Stream,
946                           ASTWriter::RecordDataImpl &Record) {
947 #define RECORD(X) EmitRecordID(X, #X, Stream, Record)
948   RECORD(STMT_STOP);
949   RECORD(STMT_NULL_PTR);
950   RECORD(STMT_REF_PTR);
951   RECORD(STMT_NULL);
952   RECORD(STMT_COMPOUND);
953   RECORD(STMT_CASE);
954   RECORD(STMT_DEFAULT);
955   RECORD(STMT_LABEL);
956   RECORD(STMT_ATTRIBUTED);
957   RECORD(STMT_IF);
958   RECORD(STMT_SWITCH);
959   RECORD(STMT_WHILE);
960   RECORD(STMT_DO);
961   RECORD(STMT_FOR);
962   RECORD(STMT_GOTO);
963   RECORD(STMT_INDIRECT_GOTO);
964   RECORD(STMT_CONTINUE);
965   RECORD(STMT_BREAK);
966   RECORD(STMT_RETURN);
967   RECORD(STMT_DECL);
968   RECORD(STMT_GCCASM);
969   RECORD(STMT_MSASM);
970   RECORD(EXPR_PREDEFINED);
971   RECORD(EXPR_DECL_REF);
972   RECORD(EXPR_INTEGER_LITERAL);
973   RECORD(EXPR_FLOATING_LITERAL);
974   RECORD(EXPR_IMAGINARY_LITERAL);
975   RECORD(EXPR_STRING_LITERAL);
976   RECORD(EXPR_CHARACTER_LITERAL);
977   RECORD(EXPR_PAREN);
978   RECORD(EXPR_PAREN_LIST);
979   RECORD(EXPR_UNARY_OPERATOR);
980   RECORD(EXPR_SIZEOF_ALIGN_OF);
981   RECORD(EXPR_ARRAY_SUBSCRIPT);
982   RECORD(EXPR_CALL);
983   RECORD(EXPR_MEMBER);
984   RECORD(EXPR_BINARY_OPERATOR);
985   RECORD(EXPR_COMPOUND_ASSIGN_OPERATOR);
986   RECORD(EXPR_CONDITIONAL_OPERATOR);
987   RECORD(EXPR_IMPLICIT_CAST);
988   RECORD(EXPR_CSTYLE_CAST);
989   RECORD(EXPR_COMPOUND_LITERAL);
990   RECORD(EXPR_EXT_VECTOR_ELEMENT);
991   RECORD(EXPR_INIT_LIST);
992   RECORD(EXPR_DESIGNATED_INIT);
993   RECORD(EXPR_DESIGNATED_INIT_UPDATE);
994   RECORD(EXPR_IMPLICIT_VALUE_INIT);
995   RECORD(EXPR_NO_INIT);
996   RECORD(EXPR_VA_ARG);
997   RECORD(EXPR_ADDR_LABEL);
998   RECORD(EXPR_STMT);
999   RECORD(EXPR_CHOOSE);
1000   RECORD(EXPR_GNU_NULL);
1001   RECORD(EXPR_SHUFFLE_VECTOR);
1002   RECORD(EXPR_BLOCK);
1003   RECORD(EXPR_GENERIC_SELECTION);
1004   RECORD(EXPR_OBJC_STRING_LITERAL);
1005   RECORD(EXPR_OBJC_BOXED_EXPRESSION);
1006   RECORD(EXPR_OBJC_ARRAY_LITERAL);
1007   RECORD(EXPR_OBJC_DICTIONARY_LITERAL);
1008   RECORD(EXPR_OBJC_ENCODE);
1009   RECORD(EXPR_OBJC_SELECTOR_EXPR);
1010   RECORD(EXPR_OBJC_PROTOCOL_EXPR);
1011   RECORD(EXPR_OBJC_IVAR_REF_EXPR);
1012   RECORD(EXPR_OBJC_PROPERTY_REF_EXPR);
1013   RECORD(EXPR_OBJC_KVC_REF_EXPR);
1014   RECORD(EXPR_OBJC_MESSAGE_EXPR);
1015   RECORD(STMT_OBJC_FOR_COLLECTION);
1016   RECORD(STMT_OBJC_CATCH);
1017   RECORD(STMT_OBJC_FINALLY);
1018   RECORD(STMT_OBJC_AT_TRY);
1019   RECORD(STMT_OBJC_AT_SYNCHRONIZED);
1020   RECORD(STMT_OBJC_AT_THROW);
1021   RECORD(EXPR_OBJC_BOOL_LITERAL);
1022   RECORD(STMT_CXX_CATCH);
1023   RECORD(STMT_CXX_TRY);
1024   RECORD(STMT_CXX_FOR_RANGE);
1025   RECORD(EXPR_CXX_OPERATOR_CALL);
1026   RECORD(EXPR_CXX_MEMBER_CALL);
1027   RECORD(EXPR_CXX_REWRITTEN_BINARY_OPERATOR);
1028   RECORD(EXPR_CXX_CONSTRUCT);
1029   RECORD(EXPR_CXX_TEMPORARY_OBJECT);
1030   RECORD(EXPR_CXX_STATIC_CAST);
1031   RECORD(EXPR_CXX_DYNAMIC_CAST);
1032   RECORD(EXPR_CXX_REINTERPRET_CAST);
1033   RECORD(EXPR_CXX_CONST_CAST);
1034   RECORD(EXPR_CXX_FUNCTIONAL_CAST);
1035   RECORD(EXPR_USER_DEFINED_LITERAL);
1036   RECORD(EXPR_CXX_STD_INITIALIZER_LIST);
1037   RECORD(EXPR_CXX_BOOL_LITERAL);
1038   RECORD(EXPR_CXX_NULL_PTR_LITERAL);
1039   RECORD(EXPR_CXX_TYPEID_EXPR);
1040   RECORD(EXPR_CXX_TYPEID_TYPE);
1041   RECORD(EXPR_CXX_THIS);
1042   RECORD(EXPR_CXX_THROW);
1043   RECORD(EXPR_CXX_DEFAULT_ARG);
1044   RECORD(EXPR_CXX_DEFAULT_INIT);
1045   RECORD(EXPR_CXX_BIND_TEMPORARY);
1046   RECORD(EXPR_CXX_SCALAR_VALUE_INIT);
1047   RECORD(EXPR_CXX_NEW);
1048   RECORD(EXPR_CXX_DELETE);
1049   RECORD(EXPR_CXX_PSEUDO_DESTRUCTOR);
1050   RECORD(EXPR_EXPR_WITH_CLEANUPS);
1051   RECORD(EXPR_CXX_DEPENDENT_SCOPE_MEMBER);
1052   RECORD(EXPR_CXX_DEPENDENT_SCOPE_DECL_REF);
1053   RECORD(EXPR_CXX_UNRESOLVED_CONSTRUCT);
1054   RECORD(EXPR_CXX_UNRESOLVED_MEMBER);
1055   RECORD(EXPR_CXX_UNRESOLVED_LOOKUP);
1056   RECORD(EXPR_CXX_EXPRESSION_TRAIT);
1057   RECORD(EXPR_CXX_NOEXCEPT);
1058   RECORD(EXPR_OPAQUE_VALUE);
1059   RECORD(EXPR_BINARY_CONDITIONAL_OPERATOR);
1060   RECORD(EXPR_TYPE_TRAIT);
1061   RECORD(EXPR_ARRAY_TYPE_TRAIT);
1062   RECORD(EXPR_PACK_EXPANSION);
1063   RECORD(EXPR_SIZEOF_PACK);
1064   RECORD(EXPR_SUBST_NON_TYPE_TEMPLATE_PARM);
1065   RECORD(EXPR_SUBST_NON_TYPE_TEMPLATE_PARM_PACK);
1066   RECORD(EXPR_FUNCTION_PARM_PACK);
1067   RECORD(EXPR_MATERIALIZE_TEMPORARY);
1068   RECORD(EXPR_CUDA_KERNEL_CALL);
1069   RECORD(EXPR_CXX_UUIDOF_EXPR);
1070   RECORD(EXPR_CXX_UUIDOF_TYPE);
1071   RECORD(EXPR_LAMBDA);
1072 #undef RECORD
1073 }
1074 
1075 void ASTWriter::WriteBlockInfoBlock() {
1076   RecordData Record;
1077   Stream.EnterBlockInfoBlock();
1078 
1079 #define BLOCK(X) EmitBlockID(X ## _ID, #X, Stream, Record)
1080 #define RECORD(X) EmitRecordID(X, #X, Stream, Record)
1081 
1082   // Control Block.
1083   BLOCK(CONTROL_BLOCK);
1084   RECORD(METADATA);
1085   RECORD(MODULE_NAME);
1086   RECORD(MODULE_DIRECTORY);
1087   RECORD(MODULE_MAP_FILE);
1088   RECORD(IMPORTS);
1089   RECORD(ORIGINAL_FILE);
1090   RECORD(ORIGINAL_PCH_DIR);
1091   RECORD(ORIGINAL_FILE_ID);
1092   RECORD(INPUT_FILE_OFFSETS);
1093 
1094   BLOCK(OPTIONS_BLOCK);
1095   RECORD(LANGUAGE_OPTIONS);
1096   RECORD(TARGET_OPTIONS);
1097   RECORD(FILE_SYSTEM_OPTIONS);
1098   RECORD(HEADER_SEARCH_OPTIONS);
1099   RECORD(PREPROCESSOR_OPTIONS);
1100 
1101   BLOCK(INPUT_FILES_BLOCK);
1102   RECORD(INPUT_FILE);
1103   RECORD(INPUT_FILE_HASH);
1104 
1105   // AST Top-Level Block.
1106   BLOCK(AST_BLOCK);
1107   RECORD(TYPE_OFFSET);
1108   RECORD(DECL_OFFSET);
1109   RECORD(IDENTIFIER_OFFSET);
1110   RECORD(IDENTIFIER_TABLE);
1111   RECORD(EAGERLY_DESERIALIZED_DECLS);
1112   RECORD(MODULAR_CODEGEN_DECLS);
1113   RECORD(SPECIAL_TYPES);
1114   RECORD(STATISTICS);
1115   RECORD(TENTATIVE_DEFINITIONS);
1116   RECORD(SELECTOR_OFFSETS);
1117   RECORD(METHOD_POOL);
1118   RECORD(PP_COUNTER_VALUE);
1119   RECORD(SOURCE_LOCATION_OFFSETS);
1120   RECORD(SOURCE_LOCATION_PRELOADS);
1121   RECORD(EXT_VECTOR_DECLS);
1122   RECORD(UNUSED_FILESCOPED_DECLS);
1123   RECORD(PPD_ENTITIES_OFFSETS);
1124   RECORD(VTABLE_USES);
1125   RECORD(PPD_SKIPPED_RANGES);
1126   RECORD(REFERENCED_SELECTOR_POOL);
1127   RECORD(TU_UPDATE_LEXICAL);
1128   RECORD(SEMA_DECL_REFS);
1129   RECORD(WEAK_UNDECLARED_IDENTIFIERS);
1130   RECORD(PENDING_IMPLICIT_INSTANTIATIONS);
1131   RECORD(UPDATE_VISIBLE);
1132   RECORD(DECL_UPDATE_OFFSETS);
1133   RECORD(DECL_UPDATES);
1134   RECORD(CUDA_SPECIAL_DECL_REFS);
1135   RECORD(HEADER_SEARCH_TABLE);
1136   RECORD(FP_PRAGMA_OPTIONS);
1137   RECORD(OPENCL_EXTENSIONS);
1138   RECORD(OPENCL_EXTENSION_TYPES);
1139   RECORD(OPENCL_EXTENSION_DECLS);
1140   RECORD(DELEGATING_CTORS);
1141   RECORD(KNOWN_NAMESPACES);
1142   RECORD(MODULE_OFFSET_MAP);
1143   RECORD(SOURCE_MANAGER_LINE_TABLE);
1144   RECORD(OBJC_CATEGORIES_MAP);
1145   RECORD(FILE_SORTED_DECLS);
1146   RECORD(IMPORTED_MODULES);
1147   RECORD(OBJC_CATEGORIES);
1148   RECORD(MACRO_OFFSET);
1149   RECORD(INTERESTING_IDENTIFIERS);
1150   RECORD(UNDEFINED_BUT_USED);
1151   RECORD(LATE_PARSED_TEMPLATE);
1152   RECORD(OPTIMIZE_PRAGMA_OPTIONS);
1153   RECORD(MSSTRUCT_PRAGMA_OPTIONS);
1154   RECORD(POINTERS_TO_MEMBERS_PRAGMA_OPTIONS);
1155   RECORD(UNUSED_LOCAL_TYPEDEF_NAME_CANDIDATES);
1156   RECORD(DELETE_EXPRS_TO_ANALYZE);
1157   RECORD(CUDA_PRAGMA_FORCE_HOST_DEVICE_DEPTH);
1158   RECORD(PP_CONDITIONAL_STACK);
1159 
1160   // SourceManager Block.
1161   BLOCK(SOURCE_MANAGER_BLOCK);
1162   RECORD(SM_SLOC_FILE_ENTRY);
1163   RECORD(SM_SLOC_BUFFER_ENTRY);
1164   RECORD(SM_SLOC_BUFFER_BLOB);
1165   RECORD(SM_SLOC_BUFFER_BLOB_COMPRESSED);
1166   RECORD(SM_SLOC_EXPANSION_ENTRY);
1167 
1168   // Preprocessor Block.
1169   BLOCK(PREPROCESSOR_BLOCK);
1170   RECORD(PP_MACRO_DIRECTIVE_HISTORY);
1171   RECORD(PP_MACRO_FUNCTION_LIKE);
1172   RECORD(PP_MACRO_OBJECT_LIKE);
1173   RECORD(PP_MODULE_MACRO);
1174   RECORD(PP_TOKEN);
1175 
1176   // Submodule Block.
1177   BLOCK(SUBMODULE_BLOCK);
1178   RECORD(SUBMODULE_METADATA);
1179   RECORD(SUBMODULE_DEFINITION);
1180   RECORD(SUBMODULE_UMBRELLA_HEADER);
1181   RECORD(SUBMODULE_HEADER);
1182   RECORD(SUBMODULE_TOPHEADER);
1183   RECORD(SUBMODULE_UMBRELLA_DIR);
1184   RECORD(SUBMODULE_IMPORTS);
1185   RECORD(SUBMODULE_EXPORTS);
1186   RECORD(SUBMODULE_REQUIRES);
1187   RECORD(SUBMODULE_EXCLUDED_HEADER);
1188   RECORD(SUBMODULE_LINK_LIBRARY);
1189   RECORD(SUBMODULE_CONFIG_MACRO);
1190   RECORD(SUBMODULE_CONFLICT);
1191   RECORD(SUBMODULE_PRIVATE_HEADER);
1192   RECORD(SUBMODULE_TEXTUAL_HEADER);
1193   RECORD(SUBMODULE_PRIVATE_TEXTUAL_HEADER);
1194   RECORD(SUBMODULE_INITIALIZERS);
1195   RECORD(SUBMODULE_EXPORT_AS);
1196 
1197   // Comments Block.
1198   BLOCK(COMMENTS_BLOCK);
1199   RECORD(COMMENTS_RAW_COMMENT);
1200 
1201   // Decls and Types block.
1202   BLOCK(DECLTYPES_BLOCK);
1203   RECORD(TYPE_EXT_QUAL);
1204   RECORD(TYPE_COMPLEX);
1205   RECORD(TYPE_POINTER);
1206   RECORD(TYPE_BLOCK_POINTER);
1207   RECORD(TYPE_LVALUE_REFERENCE);
1208   RECORD(TYPE_RVALUE_REFERENCE);
1209   RECORD(TYPE_MEMBER_POINTER);
1210   RECORD(TYPE_CONSTANT_ARRAY);
1211   RECORD(TYPE_INCOMPLETE_ARRAY);
1212   RECORD(TYPE_VARIABLE_ARRAY);
1213   RECORD(TYPE_VECTOR);
1214   RECORD(TYPE_EXT_VECTOR);
1215   RECORD(TYPE_FUNCTION_NO_PROTO);
1216   RECORD(TYPE_FUNCTION_PROTO);
1217   RECORD(TYPE_TYPEDEF);
1218   RECORD(TYPE_TYPEOF_EXPR);
1219   RECORD(TYPE_TYPEOF);
1220   RECORD(TYPE_RECORD);
1221   RECORD(TYPE_ENUM);
1222   RECORD(TYPE_OBJC_INTERFACE);
1223   RECORD(TYPE_OBJC_OBJECT_POINTER);
1224   RECORD(TYPE_DECLTYPE);
1225   RECORD(TYPE_ELABORATED);
1226   RECORD(TYPE_SUBST_TEMPLATE_TYPE_PARM);
1227   RECORD(TYPE_UNRESOLVED_USING);
1228   RECORD(TYPE_INJECTED_CLASS_NAME);
1229   RECORD(TYPE_OBJC_OBJECT);
1230   RECORD(TYPE_TEMPLATE_TYPE_PARM);
1231   RECORD(TYPE_TEMPLATE_SPECIALIZATION);
1232   RECORD(TYPE_DEPENDENT_NAME);
1233   RECORD(TYPE_DEPENDENT_TEMPLATE_SPECIALIZATION);
1234   RECORD(TYPE_DEPENDENT_SIZED_ARRAY);
1235   RECORD(TYPE_PAREN);
1236   RECORD(TYPE_MACRO_QUALIFIED);
1237   RECORD(TYPE_PACK_EXPANSION);
1238   RECORD(TYPE_ATTRIBUTED);
1239   RECORD(TYPE_SUBST_TEMPLATE_TYPE_PARM_PACK);
1240   RECORD(TYPE_AUTO);
1241   RECORD(TYPE_UNARY_TRANSFORM);
1242   RECORD(TYPE_ATOMIC);
1243   RECORD(TYPE_DECAYED);
1244   RECORD(TYPE_ADJUSTED);
1245   RECORD(TYPE_OBJC_TYPE_PARAM);
1246   RECORD(LOCAL_REDECLARATIONS);
1247   RECORD(DECL_TYPEDEF);
1248   RECORD(DECL_TYPEALIAS);
1249   RECORD(DECL_ENUM);
1250   RECORD(DECL_RECORD);
1251   RECORD(DECL_ENUM_CONSTANT);
1252   RECORD(DECL_FUNCTION);
1253   RECORD(DECL_OBJC_METHOD);
1254   RECORD(DECL_OBJC_INTERFACE);
1255   RECORD(DECL_OBJC_PROTOCOL);
1256   RECORD(DECL_OBJC_IVAR);
1257   RECORD(DECL_OBJC_AT_DEFS_FIELD);
1258   RECORD(DECL_OBJC_CATEGORY);
1259   RECORD(DECL_OBJC_CATEGORY_IMPL);
1260   RECORD(DECL_OBJC_IMPLEMENTATION);
1261   RECORD(DECL_OBJC_COMPATIBLE_ALIAS);
1262   RECORD(DECL_OBJC_PROPERTY);
1263   RECORD(DECL_OBJC_PROPERTY_IMPL);
1264   RECORD(DECL_FIELD);
1265   RECORD(DECL_MS_PROPERTY);
1266   RECORD(DECL_VAR);
1267   RECORD(DECL_IMPLICIT_PARAM);
1268   RECORD(DECL_PARM_VAR);
1269   RECORD(DECL_FILE_SCOPE_ASM);
1270   RECORD(DECL_BLOCK);
1271   RECORD(DECL_CONTEXT_LEXICAL);
1272   RECORD(DECL_CONTEXT_VISIBLE);
1273   RECORD(DECL_NAMESPACE);
1274   RECORD(DECL_NAMESPACE_ALIAS);
1275   RECORD(DECL_USING);
1276   RECORD(DECL_USING_SHADOW);
1277   RECORD(DECL_USING_DIRECTIVE);
1278   RECORD(DECL_UNRESOLVED_USING_VALUE);
1279   RECORD(DECL_UNRESOLVED_USING_TYPENAME);
1280   RECORD(DECL_LINKAGE_SPEC);
1281   RECORD(DECL_CXX_RECORD);
1282   RECORD(DECL_CXX_METHOD);
1283   RECORD(DECL_CXX_CONSTRUCTOR);
1284   RECORD(DECL_CXX_DESTRUCTOR);
1285   RECORD(DECL_CXX_CONVERSION);
1286   RECORD(DECL_ACCESS_SPEC);
1287   RECORD(DECL_FRIEND);
1288   RECORD(DECL_FRIEND_TEMPLATE);
1289   RECORD(DECL_CLASS_TEMPLATE);
1290   RECORD(DECL_CLASS_TEMPLATE_SPECIALIZATION);
1291   RECORD(DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION);
1292   RECORD(DECL_VAR_TEMPLATE);
1293   RECORD(DECL_VAR_TEMPLATE_SPECIALIZATION);
1294   RECORD(DECL_VAR_TEMPLATE_PARTIAL_SPECIALIZATION);
1295   RECORD(DECL_FUNCTION_TEMPLATE);
1296   RECORD(DECL_TEMPLATE_TYPE_PARM);
1297   RECORD(DECL_NON_TYPE_TEMPLATE_PARM);
1298   RECORD(DECL_TEMPLATE_TEMPLATE_PARM);
1299   RECORD(DECL_CONCEPT);
1300   RECORD(DECL_TYPE_ALIAS_TEMPLATE);
1301   RECORD(DECL_STATIC_ASSERT);
1302   RECORD(DECL_CXX_BASE_SPECIFIERS);
1303   RECORD(DECL_CXX_CTOR_INITIALIZERS);
1304   RECORD(DECL_INDIRECTFIELD);
1305   RECORD(DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK);
1306   RECORD(DECL_EXPANDED_TEMPLATE_TEMPLATE_PARM_PACK);
1307   RECORD(DECL_CLASS_SCOPE_FUNCTION_SPECIALIZATION);
1308   RECORD(DECL_IMPORT);
1309   RECORD(DECL_OMP_THREADPRIVATE);
1310   RECORD(DECL_EMPTY);
1311   RECORD(DECL_OBJC_TYPE_PARAM);
1312   RECORD(DECL_OMP_CAPTUREDEXPR);
1313   RECORD(DECL_PRAGMA_COMMENT);
1314   RECORD(DECL_PRAGMA_DETECT_MISMATCH);
1315   RECORD(DECL_OMP_DECLARE_REDUCTION);
1316   RECORD(DECL_OMP_ALLOCATE);
1317 
1318   // Statements and Exprs can occur in the Decls and Types block.
1319   AddStmtsExprs(Stream, Record);
1320 
1321   BLOCK(PREPROCESSOR_DETAIL_BLOCK);
1322   RECORD(PPD_MACRO_EXPANSION);
1323   RECORD(PPD_MACRO_DEFINITION);
1324   RECORD(PPD_INCLUSION_DIRECTIVE);
1325 
1326   // Decls and Types block.
1327   BLOCK(EXTENSION_BLOCK);
1328   RECORD(EXTENSION_METADATA);
1329 
1330   BLOCK(UNHASHED_CONTROL_BLOCK);
1331   RECORD(SIGNATURE);
1332   RECORD(DIAGNOSTIC_OPTIONS);
1333   RECORD(DIAG_PRAGMA_MAPPINGS);
1334 
1335 #undef RECORD
1336 #undef BLOCK
1337   Stream.ExitBlock();
1338 }
1339 
1340 /// Prepares a path for being written to an AST file by converting it
1341 /// to an absolute path and removing nested './'s.
1342 ///
1343 /// \return \c true if the path was changed.
1344 static bool cleanPathForOutput(FileManager &FileMgr,
1345                                SmallVectorImpl<char> &Path) {
1346   bool Changed = FileMgr.makeAbsolutePath(Path);
1347   return Changed | llvm::sys::path::remove_dots(Path);
1348 }
1349 
1350 /// Adjusts the given filename to only write out the portion of the
1351 /// filename that is not part of the system root directory.
1352 ///
1353 /// \param Filename the file name to adjust.
1354 ///
1355 /// \param BaseDir When non-NULL, the PCH file is a relocatable AST file and
1356 /// the returned filename will be adjusted by this root directory.
1357 ///
1358 /// \returns either the original filename (if it needs no adjustment) or the
1359 /// adjusted filename (which points into the @p Filename parameter).
1360 static const char *
1361 adjustFilenameForRelocatableAST(const char *Filename, StringRef BaseDir) {
1362   assert(Filename && "No file name to adjust?");
1363 
1364   if (BaseDir.empty())
1365     return Filename;
1366 
1367   // Verify that the filename and the system root have the same prefix.
1368   unsigned Pos = 0;
1369   for (; Filename[Pos] && Pos < BaseDir.size(); ++Pos)
1370     if (Filename[Pos] != BaseDir[Pos])
1371       return Filename; // Prefixes don't match.
1372 
1373   // We hit the end of the filename before we hit the end of the system root.
1374   if (!Filename[Pos])
1375     return Filename;
1376 
1377   // If there's not a path separator at the end of the base directory nor
1378   // immediately after it, then this isn't within the base directory.
1379   if (!llvm::sys::path::is_separator(Filename[Pos])) {
1380     if (!llvm::sys::path::is_separator(BaseDir.back()))
1381       return Filename;
1382   } else {
1383     // If the file name has a '/' at the current position, skip over the '/'.
1384     // We distinguish relative paths from absolute paths by the
1385     // absence of '/' at the beginning of relative paths.
1386     //
1387     // FIXME: This is wrong. We distinguish them by asking if the path is
1388     // absolute, which isn't the same thing. And there might be multiple '/'s
1389     // in a row. Use a better mechanism to indicate whether we have emitted an
1390     // absolute or relative path.
1391     ++Pos;
1392   }
1393 
1394   return Filename + Pos;
1395 }
1396 
1397 ASTFileSignature ASTWriter::createSignature(StringRef Bytes) {
1398   // Calculate the hash till start of UNHASHED_CONTROL_BLOCK.
1399   llvm::SHA1 Hasher;
1400   Hasher.update(ArrayRef<uint8_t>(Bytes.bytes_begin(), Bytes.size()));
1401   auto Hash = Hasher.result();
1402 
1403   // Convert to an array [5*i32].
1404   ASTFileSignature Signature;
1405   auto LShift = [&](unsigned char Val, unsigned Shift) {
1406     return (uint32_t)Val << Shift;
1407   };
1408   for (int I = 0; I != 5; ++I)
1409     Signature[I] = LShift(Hash[I * 4 + 0], 24) | LShift(Hash[I * 4 + 1], 16) |
1410                    LShift(Hash[I * 4 + 2], 8) | LShift(Hash[I * 4 + 3], 0);
1411 
1412   return Signature;
1413 }
1414 
1415 ASTFileSignature ASTWriter::writeUnhashedControlBlock(Preprocessor &PP,
1416                                                       ASTContext &Context) {
1417   // Flush first to prepare the PCM hash (signature).
1418   Stream.FlushToWord();
1419   auto StartOfUnhashedControl = Stream.GetCurrentBitNo() >> 3;
1420 
1421   // Enter the block and prepare to write records.
1422   RecordData Record;
1423   Stream.EnterSubblock(UNHASHED_CONTROL_BLOCK_ID, 5);
1424 
1425   // For implicit modules, write the hash of the PCM as its signature.
1426   ASTFileSignature Signature;
1427   if (WritingModule &&
1428       PP.getHeaderSearchInfo().getHeaderSearchOpts().ModulesHashContent) {
1429     Signature = createSignature(StringRef(Buffer.begin(), StartOfUnhashedControl));
1430     Record.append(Signature.begin(), Signature.end());
1431     Stream.EmitRecord(SIGNATURE, Record);
1432     Record.clear();
1433   }
1434 
1435   // Diagnostic options.
1436   const auto &Diags = Context.getDiagnostics();
1437   const DiagnosticOptions &DiagOpts = Diags.getDiagnosticOptions();
1438 #define DIAGOPT(Name, Bits, Default) Record.push_back(DiagOpts.Name);
1439 #define ENUM_DIAGOPT(Name, Type, Bits, Default)                                \
1440   Record.push_back(static_cast<unsigned>(DiagOpts.get##Name()));
1441 #include "clang/Basic/DiagnosticOptions.def"
1442   Record.push_back(DiagOpts.Warnings.size());
1443   for (unsigned I = 0, N = DiagOpts.Warnings.size(); I != N; ++I)
1444     AddString(DiagOpts.Warnings[I], Record);
1445   Record.push_back(DiagOpts.Remarks.size());
1446   for (unsigned I = 0, N = DiagOpts.Remarks.size(); I != N; ++I)
1447     AddString(DiagOpts.Remarks[I], Record);
1448   // Note: we don't serialize the log or serialization file names, because they
1449   // are generally transient files and will almost always be overridden.
1450   Stream.EmitRecord(DIAGNOSTIC_OPTIONS, Record);
1451 
1452   // Write out the diagnostic/pragma mappings.
1453   WritePragmaDiagnosticMappings(Diags, /* isModule = */ WritingModule);
1454 
1455   // Leave the options block.
1456   Stream.ExitBlock();
1457   return Signature;
1458 }
1459 
1460 /// Write the control block.
1461 void ASTWriter::WriteControlBlock(Preprocessor &PP, ASTContext &Context,
1462                                   StringRef isysroot,
1463                                   const std::string &OutputFile) {
1464   using namespace llvm;
1465 
1466   Stream.EnterSubblock(CONTROL_BLOCK_ID, 5);
1467   RecordData Record;
1468 
1469   // Metadata
1470   auto MetadataAbbrev = std::make_shared<BitCodeAbbrev>();
1471   MetadataAbbrev->Add(BitCodeAbbrevOp(METADATA));
1472   MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // Major
1473   MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // Minor
1474   MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // Clang maj.
1475   MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // Clang min.
1476   MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Relocatable
1477   MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Timestamps
1478   MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // PCHHasObjectFile
1479   MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Errors
1480   MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // SVN branch/tag
1481   unsigned MetadataAbbrevCode = Stream.EmitAbbrev(std::move(MetadataAbbrev));
1482   assert((!WritingModule || isysroot.empty()) &&
1483          "writing module as a relocatable PCH?");
1484   {
1485     RecordData::value_type Record[] = {
1486         METADATA,
1487         VERSION_MAJOR,
1488         VERSION_MINOR,
1489         CLANG_VERSION_MAJOR,
1490         CLANG_VERSION_MINOR,
1491         !isysroot.empty(),
1492         IncludeTimestamps,
1493         Context.getLangOpts().BuildingPCHWithObjectFile,
1494         ASTHasCompilerErrors};
1495     Stream.EmitRecordWithBlob(MetadataAbbrevCode, Record,
1496                               getClangFullRepositoryVersion());
1497   }
1498 
1499   if (WritingModule) {
1500     // Module name
1501     auto Abbrev = std::make_shared<BitCodeAbbrev>();
1502     Abbrev->Add(BitCodeAbbrevOp(MODULE_NAME));
1503     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
1504     unsigned AbbrevCode = Stream.EmitAbbrev(std::move(Abbrev));
1505     RecordData::value_type Record[] = {MODULE_NAME};
1506     Stream.EmitRecordWithBlob(AbbrevCode, Record, WritingModule->Name);
1507   }
1508 
1509   if (WritingModule && WritingModule->Directory) {
1510     SmallString<128> BaseDir(WritingModule->Directory->getName());
1511     cleanPathForOutput(Context.getSourceManager().getFileManager(), BaseDir);
1512 
1513     // If the home of the module is the current working directory, then we
1514     // want to pick up the cwd of the build process loading the module, not
1515     // our cwd, when we load this module.
1516     if (!PP.getHeaderSearchInfo()
1517              .getHeaderSearchOpts()
1518              .ModuleMapFileHomeIsCwd ||
1519         WritingModule->Directory->getName() != StringRef(".")) {
1520       // Module directory.
1521       auto Abbrev = std::make_shared<BitCodeAbbrev>();
1522       Abbrev->Add(BitCodeAbbrevOp(MODULE_DIRECTORY));
1523       Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Directory
1524       unsigned AbbrevCode = Stream.EmitAbbrev(std::move(Abbrev));
1525 
1526       RecordData::value_type Record[] = {MODULE_DIRECTORY};
1527       Stream.EmitRecordWithBlob(AbbrevCode, Record, BaseDir);
1528     }
1529 
1530     // Write out all other paths relative to the base directory if possible.
1531     BaseDirectory.assign(BaseDir.begin(), BaseDir.end());
1532   } else if (!isysroot.empty()) {
1533     // Write out paths relative to the sysroot if possible.
1534     BaseDirectory = isysroot;
1535   }
1536 
1537   // Module map file
1538   if (WritingModule && WritingModule->Kind == Module::ModuleMapModule) {
1539     Record.clear();
1540 
1541     auto &Map = PP.getHeaderSearchInfo().getModuleMap();
1542     AddPath(WritingModule->PresumedModuleMapFile.empty()
1543                 ? Map.getModuleMapFileForUniquing(WritingModule)->getName()
1544                 : StringRef(WritingModule->PresumedModuleMapFile),
1545             Record);
1546 
1547     // Additional module map files.
1548     if (auto *AdditionalModMaps =
1549             Map.getAdditionalModuleMapFiles(WritingModule)) {
1550       Record.push_back(AdditionalModMaps->size());
1551       for (const FileEntry *F : *AdditionalModMaps)
1552         AddPath(F->getName(), Record);
1553     } else {
1554       Record.push_back(0);
1555     }
1556 
1557     Stream.EmitRecord(MODULE_MAP_FILE, Record);
1558   }
1559 
1560   // Imports
1561   if (Chain) {
1562     serialization::ModuleManager &Mgr = Chain->getModuleManager();
1563     Record.clear();
1564 
1565     for (ModuleFile &M : Mgr) {
1566       // Skip modules that weren't directly imported.
1567       if (!M.isDirectlyImported())
1568         continue;
1569 
1570       Record.push_back((unsigned)M.Kind); // FIXME: Stable encoding
1571       AddSourceLocation(M.ImportLoc, Record);
1572 
1573       // If we have calculated signature, there is no need to store
1574       // the size or timestamp.
1575       Record.push_back(M.Signature ? 0 : M.File->getSize());
1576       Record.push_back(M.Signature ? 0 : getTimestampForOutput(M.File));
1577 
1578       for (auto I : M.Signature)
1579         Record.push_back(I);
1580 
1581       AddString(M.ModuleName, Record);
1582       AddPath(M.FileName, Record);
1583     }
1584     Stream.EmitRecord(IMPORTS, Record);
1585   }
1586 
1587   // Write the options block.
1588   Stream.EnterSubblock(OPTIONS_BLOCK_ID, 4);
1589 
1590   // Language options.
1591   Record.clear();
1592   const LangOptions &LangOpts = Context.getLangOpts();
1593 #define LANGOPT(Name, Bits, Default, Description) \
1594   Record.push_back(LangOpts.Name);
1595 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
1596   Record.push_back(static_cast<unsigned>(LangOpts.get##Name()));
1597 #include "clang/Basic/LangOptions.def"
1598 #define SANITIZER(NAME, ID)                                                    \
1599   Record.push_back(LangOpts.Sanitize.has(SanitizerKind::ID));
1600 #include "clang/Basic/Sanitizers.def"
1601 
1602   Record.push_back(LangOpts.ModuleFeatures.size());
1603   for (StringRef Feature : LangOpts.ModuleFeatures)
1604     AddString(Feature, Record);
1605 
1606   Record.push_back((unsigned) LangOpts.ObjCRuntime.getKind());
1607   AddVersionTuple(LangOpts.ObjCRuntime.getVersion(), Record);
1608 
1609   AddString(LangOpts.CurrentModule, Record);
1610 
1611   // Comment options.
1612   Record.push_back(LangOpts.CommentOpts.BlockCommandNames.size());
1613   for (const auto &I : LangOpts.CommentOpts.BlockCommandNames) {
1614     AddString(I, Record);
1615   }
1616   Record.push_back(LangOpts.CommentOpts.ParseAllComments);
1617 
1618   // OpenMP offloading options.
1619   Record.push_back(LangOpts.OMPTargetTriples.size());
1620   for (auto &T : LangOpts.OMPTargetTriples)
1621     AddString(T.getTriple(), Record);
1622 
1623   AddString(LangOpts.OMPHostIRFile, Record);
1624 
1625   Stream.EmitRecord(LANGUAGE_OPTIONS, Record);
1626 
1627   // Target options.
1628   Record.clear();
1629   const TargetInfo &Target = Context.getTargetInfo();
1630   const TargetOptions &TargetOpts = Target.getTargetOpts();
1631   AddString(TargetOpts.Triple, Record);
1632   AddString(TargetOpts.CPU, Record);
1633   AddString(TargetOpts.ABI, Record);
1634   Record.push_back(TargetOpts.FeaturesAsWritten.size());
1635   for (unsigned I = 0, N = TargetOpts.FeaturesAsWritten.size(); I != N; ++I) {
1636     AddString(TargetOpts.FeaturesAsWritten[I], Record);
1637   }
1638   Record.push_back(TargetOpts.Features.size());
1639   for (unsigned I = 0, N = TargetOpts.Features.size(); I != N; ++I) {
1640     AddString(TargetOpts.Features[I], Record);
1641   }
1642   Stream.EmitRecord(TARGET_OPTIONS, Record);
1643 
1644   // File system options.
1645   Record.clear();
1646   const FileSystemOptions &FSOpts =
1647       Context.getSourceManager().getFileManager().getFileSystemOpts();
1648   AddString(FSOpts.WorkingDir, Record);
1649   Stream.EmitRecord(FILE_SYSTEM_OPTIONS, Record);
1650 
1651   // Header search options.
1652   Record.clear();
1653   const HeaderSearchOptions &HSOpts
1654     = PP.getHeaderSearchInfo().getHeaderSearchOpts();
1655   AddString(HSOpts.Sysroot, Record);
1656 
1657   // Include entries.
1658   Record.push_back(HSOpts.UserEntries.size());
1659   for (unsigned I = 0, N = HSOpts.UserEntries.size(); I != N; ++I) {
1660     const HeaderSearchOptions::Entry &Entry = HSOpts.UserEntries[I];
1661     AddString(Entry.Path, Record);
1662     Record.push_back(static_cast<unsigned>(Entry.Group));
1663     Record.push_back(Entry.IsFramework);
1664     Record.push_back(Entry.IgnoreSysRoot);
1665   }
1666 
1667   // System header prefixes.
1668   Record.push_back(HSOpts.SystemHeaderPrefixes.size());
1669   for (unsigned I = 0, N = HSOpts.SystemHeaderPrefixes.size(); I != N; ++I) {
1670     AddString(HSOpts.SystemHeaderPrefixes[I].Prefix, Record);
1671     Record.push_back(HSOpts.SystemHeaderPrefixes[I].IsSystemHeader);
1672   }
1673 
1674   AddString(HSOpts.ResourceDir, Record);
1675   AddString(HSOpts.ModuleCachePath, Record);
1676   AddString(HSOpts.ModuleUserBuildPath, Record);
1677   Record.push_back(HSOpts.DisableModuleHash);
1678   Record.push_back(HSOpts.ImplicitModuleMaps);
1679   Record.push_back(HSOpts.ModuleMapFileHomeIsCwd);
1680   Record.push_back(HSOpts.UseBuiltinIncludes);
1681   Record.push_back(HSOpts.UseStandardSystemIncludes);
1682   Record.push_back(HSOpts.UseStandardCXXIncludes);
1683   Record.push_back(HSOpts.UseLibcxx);
1684   // Write out the specific module cache path that contains the module files.
1685   AddString(PP.getHeaderSearchInfo().getModuleCachePath(), Record);
1686   Stream.EmitRecord(HEADER_SEARCH_OPTIONS, Record);
1687 
1688   // Preprocessor options.
1689   Record.clear();
1690   const PreprocessorOptions &PPOpts = PP.getPreprocessorOpts();
1691 
1692   // Macro definitions.
1693   Record.push_back(PPOpts.Macros.size());
1694   for (unsigned I = 0, N = PPOpts.Macros.size(); I != N; ++I) {
1695     AddString(PPOpts.Macros[I].first, Record);
1696     Record.push_back(PPOpts.Macros[I].second);
1697   }
1698 
1699   // Includes
1700   Record.push_back(PPOpts.Includes.size());
1701   for (unsigned I = 0, N = PPOpts.Includes.size(); I != N; ++I)
1702     AddString(PPOpts.Includes[I], Record);
1703 
1704   // Macro includes
1705   Record.push_back(PPOpts.MacroIncludes.size());
1706   for (unsigned I = 0, N = PPOpts.MacroIncludes.size(); I != N; ++I)
1707     AddString(PPOpts.MacroIncludes[I], Record);
1708 
1709   Record.push_back(PPOpts.UsePredefines);
1710   // Detailed record is important since it is used for the module cache hash.
1711   Record.push_back(PPOpts.DetailedRecord);
1712   AddString(PPOpts.ImplicitPCHInclude, Record);
1713   Record.push_back(static_cast<unsigned>(PPOpts.ObjCXXARCStandardLibrary));
1714   Stream.EmitRecord(PREPROCESSOR_OPTIONS, Record);
1715 
1716   // Leave the options block.
1717   Stream.ExitBlock();
1718 
1719   // Original file name and file ID
1720   SourceManager &SM = Context.getSourceManager();
1721   if (const FileEntry *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
1722     auto FileAbbrev = std::make_shared<BitCodeAbbrev>();
1723     FileAbbrev->Add(BitCodeAbbrevOp(ORIGINAL_FILE));
1724     FileAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // File ID
1725     FileAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // File name
1726     unsigned FileAbbrevCode = Stream.EmitAbbrev(std::move(FileAbbrev));
1727 
1728     Record.clear();
1729     Record.push_back(ORIGINAL_FILE);
1730     Record.push_back(SM.getMainFileID().getOpaqueValue());
1731     EmitRecordWithPath(FileAbbrevCode, Record, MainFile->getName());
1732   }
1733 
1734   Record.clear();
1735   Record.push_back(SM.getMainFileID().getOpaqueValue());
1736   Stream.EmitRecord(ORIGINAL_FILE_ID, Record);
1737 
1738   // Original PCH directory
1739   if (!OutputFile.empty() && OutputFile != "-") {
1740     auto Abbrev = std::make_shared<BitCodeAbbrev>();
1741     Abbrev->Add(BitCodeAbbrevOp(ORIGINAL_PCH_DIR));
1742     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // File name
1743     unsigned AbbrevCode = Stream.EmitAbbrev(std::move(Abbrev));
1744 
1745     SmallString<128> OutputPath(OutputFile);
1746 
1747     SM.getFileManager().makeAbsolutePath(OutputPath);
1748     StringRef origDir = llvm::sys::path::parent_path(OutputPath);
1749 
1750     RecordData::value_type Record[] = {ORIGINAL_PCH_DIR};
1751     Stream.EmitRecordWithBlob(AbbrevCode, Record, origDir);
1752   }
1753 
1754   WriteInputFiles(Context.SourceMgr,
1755                   PP.getHeaderSearchInfo().getHeaderSearchOpts(),
1756                   PP.getLangOpts().Modules);
1757   Stream.ExitBlock();
1758 }
1759 
1760 namespace  {
1761 
1762 /// An input file.
1763 struct InputFileEntry {
1764   const FileEntry *File;
1765   bool IsSystemFile;
1766   bool IsTransient;
1767   bool BufferOverridden;
1768   bool IsTopLevelModuleMap;
1769   uint32_t ContentHash[2];
1770 };
1771 
1772 } // namespace
1773 
1774 void ASTWriter::WriteInputFiles(SourceManager &SourceMgr,
1775                                 HeaderSearchOptions &HSOpts,
1776                                 bool Modules) {
1777   using namespace llvm;
1778 
1779   Stream.EnterSubblock(INPUT_FILES_BLOCK_ID, 4);
1780 
1781   // Create input-file abbreviation.
1782   auto IFAbbrev = std::make_shared<BitCodeAbbrev>();
1783   IFAbbrev->Add(BitCodeAbbrevOp(INPUT_FILE));
1784   IFAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ID
1785   IFAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 12)); // Size
1786   IFAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 32)); // Modification time
1787   IFAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Overridden
1788   IFAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Transient
1789   IFAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Module map
1790   IFAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // File name
1791   unsigned IFAbbrevCode = Stream.EmitAbbrev(std::move(IFAbbrev));
1792 
1793   // Create input file hash abbreviation.
1794   auto IFHAbbrev = std::make_shared<BitCodeAbbrev>();
1795   IFHAbbrev->Add(BitCodeAbbrevOp(INPUT_FILE_HASH));
1796   IFHAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1797   IFHAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1798   unsigned IFHAbbrevCode = Stream.EmitAbbrev(std::move(IFHAbbrev));
1799 
1800   // Get all ContentCache objects for files, sorted by whether the file is a
1801   // system one or not. System files go at the back, users files at the front.
1802   std::deque<InputFileEntry> SortedFiles;
1803   for (unsigned I = 1, N = SourceMgr.local_sloc_entry_size(); I != N; ++I) {
1804     // Get this source location entry.
1805     const SrcMgr::SLocEntry *SLoc = &SourceMgr.getLocalSLocEntry(I);
1806     assert(&SourceMgr.getSLocEntry(FileID::get(I)) == SLoc);
1807 
1808     // We only care about file entries that were not overridden.
1809     if (!SLoc->isFile())
1810       continue;
1811     const SrcMgr::FileInfo &File = SLoc->getFile();
1812     const SrcMgr::ContentCache *Cache = File.getContentCache();
1813     if (!Cache->OrigEntry)
1814       continue;
1815 
1816     InputFileEntry Entry;
1817     Entry.File = Cache->OrigEntry;
1818     Entry.IsSystemFile = isSystem(File.getFileCharacteristic());
1819     Entry.IsTransient = Cache->IsTransient;
1820     Entry.BufferOverridden = Cache->BufferOverridden;
1821     Entry.IsTopLevelModuleMap = isModuleMap(File.getFileCharacteristic()) &&
1822                                 File.getIncludeLoc().isInvalid();
1823 
1824     auto ContentHash = hash_code(-1);
1825     if (PP->getHeaderSearchInfo()
1826             .getHeaderSearchOpts()
1827             .ValidateASTInputFilesContent) {
1828       auto *MemBuff = Cache->getRawBuffer();
1829       if (MemBuff)
1830         ContentHash = hash_value(MemBuff->getBuffer());
1831       else
1832         // FIXME: The path should be taken from the FileEntryRef.
1833         PP->Diag(SourceLocation(), diag::err_module_unable_to_hash_content)
1834             << Entry.File->getName();
1835     }
1836     auto CH = llvm::APInt(64, ContentHash);
1837     Entry.ContentHash[0] =
1838         static_cast<uint32_t>(CH.getLoBits(32).getZExtValue());
1839     Entry.ContentHash[1] =
1840         static_cast<uint32_t>(CH.getHiBits(32).getZExtValue());
1841 
1842     if (Entry.IsSystemFile)
1843       SortedFiles.push_back(Entry);
1844     else
1845       SortedFiles.push_front(Entry);
1846   }
1847 
1848   unsigned UserFilesNum = 0;
1849   // Write out all of the input files.
1850   std::vector<uint64_t> InputFileOffsets;
1851   for (const auto &Entry : SortedFiles) {
1852     uint32_t &InputFileID = InputFileIDs[Entry.File];
1853     if (InputFileID != 0)
1854       continue; // already recorded this file.
1855 
1856     // Record this entry's offset.
1857     InputFileOffsets.push_back(Stream.GetCurrentBitNo());
1858 
1859     InputFileID = InputFileOffsets.size();
1860 
1861     if (!Entry.IsSystemFile)
1862       ++UserFilesNum;
1863 
1864     // Emit size/modification time for this file.
1865     // And whether this file was overridden.
1866     {
1867       RecordData::value_type Record[] = {
1868           INPUT_FILE,
1869           InputFileOffsets.size(),
1870           (uint64_t)Entry.File->getSize(),
1871           (uint64_t)getTimestampForOutput(Entry.File),
1872           Entry.BufferOverridden,
1873           Entry.IsTransient,
1874           Entry.IsTopLevelModuleMap};
1875 
1876       // FIXME: The path should be taken from the FileEntryRef.
1877       EmitRecordWithPath(IFAbbrevCode, Record, Entry.File->getName());
1878     }
1879 
1880     // Emit content hash for this file.
1881     {
1882       RecordData::value_type Record[] = {INPUT_FILE_HASH, Entry.ContentHash[0],
1883                                          Entry.ContentHash[1]};
1884       Stream.EmitRecordWithAbbrev(IFHAbbrevCode, Record);
1885     }
1886   }
1887 
1888   Stream.ExitBlock();
1889 
1890   // Create input file offsets abbreviation.
1891   auto OffsetsAbbrev = std::make_shared<BitCodeAbbrev>();
1892   OffsetsAbbrev->Add(BitCodeAbbrevOp(INPUT_FILE_OFFSETS));
1893   OffsetsAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // # input files
1894   OffsetsAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // # non-system
1895                                                                 //   input files
1896   OffsetsAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));   // Array
1897   unsigned OffsetsAbbrevCode = Stream.EmitAbbrev(std::move(OffsetsAbbrev));
1898 
1899   // Write input file offsets.
1900   RecordData::value_type Record[] = {INPUT_FILE_OFFSETS,
1901                                      InputFileOffsets.size(), UserFilesNum};
1902   Stream.EmitRecordWithBlob(OffsetsAbbrevCode, Record, bytes(InputFileOffsets));
1903 }
1904 
1905 //===----------------------------------------------------------------------===//
1906 // Source Manager Serialization
1907 //===----------------------------------------------------------------------===//
1908 
1909 /// Create an abbreviation for the SLocEntry that refers to a
1910 /// file.
1911 static unsigned CreateSLocFileAbbrev(llvm::BitstreamWriter &Stream) {
1912   using namespace llvm;
1913 
1914   auto Abbrev = std::make_shared<BitCodeAbbrev>();
1915   Abbrev->Add(BitCodeAbbrevOp(SM_SLOC_FILE_ENTRY));
1916   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Offset
1917   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Include location
1918   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Characteristic
1919   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Line directives
1920   // FileEntry fields.
1921   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Input File ID
1922   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // NumCreatedFIDs
1923   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 24)); // FirstDeclIndex
1924   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // NumDecls
1925   return Stream.EmitAbbrev(std::move(Abbrev));
1926 }
1927 
1928 /// Create an abbreviation for the SLocEntry that refers to a
1929 /// buffer.
1930 static unsigned CreateSLocBufferAbbrev(llvm::BitstreamWriter &Stream) {
1931   using namespace llvm;
1932 
1933   auto Abbrev = std::make_shared<BitCodeAbbrev>();
1934   Abbrev->Add(BitCodeAbbrevOp(SM_SLOC_BUFFER_ENTRY));
1935   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Offset
1936   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Include location
1937   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Characteristic
1938   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Line directives
1939   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Buffer name blob
1940   return Stream.EmitAbbrev(std::move(Abbrev));
1941 }
1942 
1943 /// Create an abbreviation for the SLocEntry that refers to a
1944 /// buffer's blob.
1945 static unsigned CreateSLocBufferBlobAbbrev(llvm::BitstreamWriter &Stream,
1946                                            bool Compressed) {
1947   using namespace llvm;
1948 
1949   auto Abbrev = std::make_shared<BitCodeAbbrev>();
1950   Abbrev->Add(BitCodeAbbrevOp(Compressed ? SM_SLOC_BUFFER_BLOB_COMPRESSED
1951                                          : SM_SLOC_BUFFER_BLOB));
1952   if (Compressed)
1953     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Uncompressed size
1954   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Blob
1955   return Stream.EmitAbbrev(std::move(Abbrev));
1956 }
1957 
1958 /// Create an abbreviation for the SLocEntry that refers to a macro
1959 /// expansion.
1960 static unsigned CreateSLocExpansionAbbrev(llvm::BitstreamWriter &Stream) {
1961   using namespace llvm;
1962 
1963   auto Abbrev = std::make_shared<BitCodeAbbrev>();
1964   Abbrev->Add(BitCodeAbbrevOp(SM_SLOC_EXPANSION_ENTRY));
1965   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Offset
1966   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Spelling location
1967   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Start location
1968   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // End location
1969   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Is token range
1970   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Token length
1971   return Stream.EmitAbbrev(std::move(Abbrev));
1972 }
1973 
1974 namespace {
1975 
1976   // Trait used for the on-disk hash table of header search information.
1977   class HeaderFileInfoTrait {
1978     ASTWriter &Writer;
1979 
1980     // Keep track of the framework names we've used during serialization.
1981     SmallVector<char, 128> FrameworkStringData;
1982     llvm::StringMap<unsigned> FrameworkNameOffset;
1983 
1984   public:
1985     HeaderFileInfoTrait(ASTWriter &Writer) : Writer(Writer) {}
1986 
1987     struct key_type {
1988       StringRef Filename;
1989       off_t Size;
1990       time_t ModTime;
1991     };
1992     using key_type_ref = const key_type &;
1993 
1994     using UnresolvedModule =
1995         llvm::PointerIntPair<Module *, 2, ModuleMap::ModuleHeaderRole>;
1996 
1997     struct data_type {
1998       const HeaderFileInfo &HFI;
1999       ArrayRef<ModuleMap::KnownHeader> KnownHeaders;
2000       UnresolvedModule Unresolved;
2001     };
2002     using data_type_ref = const data_type &;
2003 
2004     using hash_value_type = unsigned;
2005     using offset_type = unsigned;
2006 
2007     hash_value_type ComputeHash(key_type_ref key) {
2008       // The hash is based only on size/time of the file, so that the reader can
2009       // match even when symlinking or excess path elements ("foo/../", "../")
2010       // change the form of the name. However, complete path is still the key.
2011       return llvm::hash_combine(key.Size, key.ModTime);
2012     }
2013 
2014     std::pair<unsigned, unsigned>
2015     EmitKeyDataLength(raw_ostream& Out, key_type_ref key, data_type_ref Data) {
2016       using namespace llvm::support;
2017 
2018       endian::Writer LE(Out, little);
2019       unsigned KeyLen = key.Filename.size() + 1 + 8 + 8;
2020       LE.write<uint16_t>(KeyLen);
2021       unsigned DataLen = 1 + 2 + 4 + 4;
2022       for (auto ModInfo : Data.KnownHeaders)
2023         if (Writer.getLocalOrImportedSubmoduleID(ModInfo.getModule()))
2024           DataLen += 4;
2025       if (Data.Unresolved.getPointer())
2026         DataLen += 4;
2027       LE.write<uint8_t>(DataLen);
2028       return std::make_pair(KeyLen, DataLen);
2029     }
2030 
2031     void EmitKey(raw_ostream& Out, key_type_ref key, unsigned KeyLen) {
2032       using namespace llvm::support;
2033 
2034       endian::Writer LE(Out, little);
2035       LE.write<uint64_t>(key.Size);
2036       KeyLen -= 8;
2037       LE.write<uint64_t>(key.ModTime);
2038       KeyLen -= 8;
2039       Out.write(key.Filename.data(), KeyLen);
2040     }
2041 
2042     void EmitData(raw_ostream &Out, key_type_ref key,
2043                   data_type_ref Data, unsigned DataLen) {
2044       using namespace llvm::support;
2045 
2046       endian::Writer LE(Out, little);
2047       uint64_t Start = Out.tell(); (void)Start;
2048 
2049       unsigned char Flags = (Data.HFI.isImport << 5)
2050                           | (Data.HFI.isPragmaOnce << 4)
2051                           | (Data.HFI.DirInfo << 1)
2052                           | Data.HFI.IndexHeaderMapHeader;
2053       LE.write<uint8_t>(Flags);
2054       LE.write<uint16_t>(Data.HFI.NumIncludes);
2055 
2056       if (!Data.HFI.ControllingMacro)
2057         LE.write<uint32_t>(Data.HFI.ControllingMacroID);
2058       else
2059         LE.write<uint32_t>(Writer.getIdentifierRef(Data.HFI.ControllingMacro));
2060 
2061       unsigned Offset = 0;
2062       if (!Data.HFI.Framework.empty()) {
2063         // If this header refers into a framework, save the framework name.
2064         llvm::StringMap<unsigned>::iterator Pos
2065           = FrameworkNameOffset.find(Data.HFI.Framework);
2066         if (Pos == FrameworkNameOffset.end()) {
2067           Offset = FrameworkStringData.size() + 1;
2068           FrameworkStringData.append(Data.HFI.Framework.begin(),
2069                                      Data.HFI.Framework.end());
2070           FrameworkStringData.push_back(0);
2071 
2072           FrameworkNameOffset[Data.HFI.Framework] = Offset;
2073         } else
2074           Offset = Pos->second;
2075       }
2076       LE.write<uint32_t>(Offset);
2077 
2078       auto EmitModule = [&](Module *M, ModuleMap::ModuleHeaderRole Role) {
2079         if (uint32_t ModID = Writer.getLocalOrImportedSubmoduleID(M)) {
2080           uint32_t Value = (ModID << 2) | (unsigned)Role;
2081           assert((Value >> 2) == ModID && "overflow in header module info");
2082           LE.write<uint32_t>(Value);
2083         }
2084       };
2085 
2086       // FIXME: If the header is excluded, we should write out some
2087       // record of that fact.
2088       for (auto ModInfo : Data.KnownHeaders)
2089         EmitModule(ModInfo.getModule(), ModInfo.getRole());
2090       if (Data.Unresolved.getPointer())
2091         EmitModule(Data.Unresolved.getPointer(), Data.Unresolved.getInt());
2092 
2093       assert(Out.tell() - Start == DataLen && "Wrong data length");
2094     }
2095 
2096     const char *strings_begin() const { return FrameworkStringData.begin(); }
2097     const char *strings_end() const { return FrameworkStringData.end(); }
2098   };
2099 
2100 } // namespace
2101 
2102 /// Write the header search block for the list of files that
2103 ///
2104 /// \param HS The header search structure to save.
2105 void ASTWriter::WriteHeaderSearch(const HeaderSearch &HS) {
2106   HeaderFileInfoTrait GeneratorTrait(*this);
2107   llvm::OnDiskChainedHashTableGenerator<HeaderFileInfoTrait> Generator;
2108   SmallVector<const char *, 4> SavedStrings;
2109   unsigned NumHeaderSearchEntries = 0;
2110 
2111   // Find all unresolved headers for the current module. We generally will
2112   // have resolved them before we get here, but not necessarily: we might be
2113   // compiling a preprocessed module, where there is no requirement for the
2114   // original files to exist any more.
2115   const HeaderFileInfo Empty; // So we can take a reference.
2116   if (WritingModule) {
2117     llvm::SmallVector<Module *, 16> Worklist(1, WritingModule);
2118     while (!Worklist.empty()) {
2119       Module *M = Worklist.pop_back_val();
2120       if (!M->isAvailable())
2121         continue;
2122 
2123       // Map to disk files where possible, to pick up any missing stat
2124       // information. This also means we don't need to check the unresolved
2125       // headers list when emitting resolved headers in the first loop below.
2126       // FIXME: It'd be preferable to avoid doing this if we were given
2127       // sufficient stat information in the module map.
2128       HS.getModuleMap().resolveHeaderDirectives(M);
2129 
2130       // If the file didn't exist, we can still create a module if we were given
2131       // enough information in the module map.
2132       for (auto U : M->MissingHeaders) {
2133         // Check that we were given enough information to build a module
2134         // without this file existing on disk.
2135         if (!U.Size || (!U.ModTime && IncludeTimestamps)) {
2136           PP->Diag(U.FileNameLoc, diag::err_module_no_size_mtime_for_header)
2137             << WritingModule->getFullModuleName() << U.Size.hasValue()
2138             << U.FileName;
2139           continue;
2140         }
2141 
2142         // Form the effective relative pathname for the file.
2143         SmallString<128> Filename(M->Directory->getName());
2144         llvm::sys::path::append(Filename, U.FileName);
2145         PreparePathForOutput(Filename);
2146 
2147         StringRef FilenameDup = strdup(Filename.c_str());
2148         SavedStrings.push_back(FilenameDup.data());
2149 
2150         HeaderFileInfoTrait::key_type Key = {
2151           FilenameDup, *U.Size, IncludeTimestamps ? *U.ModTime : 0
2152         };
2153         HeaderFileInfoTrait::data_type Data = {
2154           Empty, {}, {M, ModuleMap::headerKindToRole(U.Kind)}
2155         };
2156         // FIXME: Deal with cases where there are multiple unresolved header
2157         // directives in different submodules for the same header.
2158         Generator.insert(Key, Data, GeneratorTrait);
2159         ++NumHeaderSearchEntries;
2160       }
2161 
2162       Worklist.append(M->submodule_begin(), M->submodule_end());
2163     }
2164   }
2165 
2166   SmallVector<const FileEntry *, 16> FilesByUID;
2167   HS.getFileMgr().GetUniqueIDMapping(FilesByUID);
2168 
2169   if (FilesByUID.size() > HS.header_file_size())
2170     FilesByUID.resize(HS.header_file_size());
2171 
2172   for (unsigned UID = 0, LastUID = FilesByUID.size(); UID != LastUID; ++UID) {
2173     const FileEntry *File = FilesByUID[UID];
2174     if (!File)
2175       continue;
2176 
2177     // Get the file info. This will load info from the external source if
2178     // necessary. Skip emitting this file if we have no information on it
2179     // as a header file (in which case HFI will be null) or if it hasn't
2180     // changed since it was loaded. Also skip it if it's for a modular header
2181     // from a different module; in that case, we rely on the module(s)
2182     // containing the header to provide this information.
2183     const HeaderFileInfo *HFI =
2184         HS.getExistingFileInfo(File, /*WantExternal*/!Chain);
2185     if (!HFI || (HFI->isModuleHeader && !HFI->isCompilingModuleHeader))
2186       continue;
2187 
2188     // Massage the file path into an appropriate form.
2189     StringRef Filename = File->getName();
2190     SmallString<128> FilenameTmp(Filename);
2191     if (PreparePathForOutput(FilenameTmp)) {
2192       // If we performed any translation on the file name at all, we need to
2193       // save this string, since the generator will refer to it later.
2194       Filename = StringRef(strdup(FilenameTmp.c_str()));
2195       SavedStrings.push_back(Filename.data());
2196     }
2197 
2198     HeaderFileInfoTrait::key_type Key = {
2199       Filename, File->getSize(), getTimestampForOutput(File)
2200     };
2201     HeaderFileInfoTrait::data_type Data = {
2202       *HFI, HS.getModuleMap().findAllModulesForHeader(File), {}
2203     };
2204     Generator.insert(Key, Data, GeneratorTrait);
2205     ++NumHeaderSearchEntries;
2206   }
2207 
2208   // Create the on-disk hash table in a buffer.
2209   SmallString<4096> TableData;
2210   uint32_t BucketOffset;
2211   {
2212     using namespace llvm::support;
2213 
2214     llvm::raw_svector_ostream Out(TableData);
2215     // Make sure that no bucket is at offset 0
2216     endian::write<uint32_t>(Out, 0, little);
2217     BucketOffset = Generator.Emit(Out, GeneratorTrait);
2218   }
2219 
2220   // Create a blob abbreviation
2221   using namespace llvm;
2222 
2223   auto Abbrev = std::make_shared<BitCodeAbbrev>();
2224   Abbrev->Add(BitCodeAbbrevOp(HEADER_SEARCH_TABLE));
2225   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
2226   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
2227   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
2228   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2229   unsigned TableAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
2230 
2231   // Write the header search table
2232   RecordData::value_type Record[] = {HEADER_SEARCH_TABLE, BucketOffset,
2233                                      NumHeaderSearchEntries, TableData.size()};
2234   TableData.append(GeneratorTrait.strings_begin(),GeneratorTrait.strings_end());
2235   Stream.EmitRecordWithBlob(TableAbbrev, Record, TableData);
2236 
2237   // Free all of the strings we had to duplicate.
2238   for (unsigned I = 0, N = SavedStrings.size(); I != N; ++I)
2239     free(const_cast<char *>(SavedStrings[I]));
2240 }
2241 
2242 static void emitBlob(llvm::BitstreamWriter &Stream, StringRef Blob,
2243                      unsigned SLocBufferBlobCompressedAbbrv,
2244                      unsigned SLocBufferBlobAbbrv) {
2245   using RecordDataType = ASTWriter::RecordData::value_type;
2246 
2247   // Compress the buffer if possible. We expect that almost all PCM
2248   // consumers will not want its contents.
2249   SmallString<0> CompressedBuffer;
2250   if (llvm::zlib::isAvailable()) {
2251     llvm::Error E = llvm::zlib::compress(Blob.drop_back(1), CompressedBuffer);
2252     if (!E) {
2253       RecordDataType Record[] = {SM_SLOC_BUFFER_BLOB_COMPRESSED,
2254                                  Blob.size() - 1};
2255       Stream.EmitRecordWithBlob(SLocBufferBlobCompressedAbbrv, Record,
2256                                 CompressedBuffer);
2257       return;
2258     }
2259     llvm::consumeError(std::move(E));
2260   }
2261 
2262   RecordDataType Record[] = {SM_SLOC_BUFFER_BLOB};
2263   Stream.EmitRecordWithBlob(SLocBufferBlobAbbrv, Record, Blob);
2264 }
2265 
2266 /// Writes the block containing the serialized form of the
2267 /// source manager.
2268 ///
2269 /// TODO: We should probably use an on-disk hash table (stored in a
2270 /// blob), indexed based on the file name, so that we only create
2271 /// entries for files that we actually need. In the common case (no
2272 /// errors), we probably won't have to create file entries for any of
2273 /// the files in the AST.
2274 void ASTWriter::WriteSourceManagerBlock(SourceManager &SourceMgr,
2275                                         const Preprocessor &PP) {
2276   RecordData Record;
2277 
2278   // Enter the source manager block.
2279   Stream.EnterSubblock(SOURCE_MANAGER_BLOCK_ID, 4);
2280 
2281   // Abbreviations for the various kinds of source-location entries.
2282   unsigned SLocFileAbbrv = CreateSLocFileAbbrev(Stream);
2283   unsigned SLocBufferAbbrv = CreateSLocBufferAbbrev(Stream);
2284   unsigned SLocBufferBlobAbbrv = CreateSLocBufferBlobAbbrev(Stream, false);
2285   unsigned SLocBufferBlobCompressedAbbrv =
2286       CreateSLocBufferBlobAbbrev(Stream, true);
2287   unsigned SLocExpansionAbbrv = CreateSLocExpansionAbbrev(Stream);
2288 
2289   // Write out the source location entry table. We skip the first
2290   // entry, which is always the same dummy entry.
2291   std::vector<uint32_t> SLocEntryOffsets;
2292   RecordData PreloadSLocs;
2293   SLocEntryOffsets.reserve(SourceMgr.local_sloc_entry_size() - 1);
2294   for (unsigned I = 1, N = SourceMgr.local_sloc_entry_size();
2295        I != N; ++I) {
2296     // Get this source location entry.
2297     const SrcMgr::SLocEntry *SLoc = &SourceMgr.getLocalSLocEntry(I);
2298     FileID FID = FileID::get(I);
2299     assert(&SourceMgr.getSLocEntry(FID) == SLoc);
2300 
2301     // Record the offset of this source-location entry.
2302     SLocEntryOffsets.push_back(Stream.GetCurrentBitNo());
2303 
2304     // Figure out which record code to use.
2305     unsigned Code;
2306     if (SLoc->isFile()) {
2307       const SrcMgr::ContentCache *Cache = SLoc->getFile().getContentCache();
2308       if (Cache->OrigEntry) {
2309         Code = SM_SLOC_FILE_ENTRY;
2310       } else
2311         Code = SM_SLOC_BUFFER_ENTRY;
2312     } else
2313       Code = SM_SLOC_EXPANSION_ENTRY;
2314     Record.clear();
2315     Record.push_back(Code);
2316 
2317     // Starting offset of this entry within this module, so skip the dummy.
2318     Record.push_back(SLoc->getOffset() - 2);
2319     if (SLoc->isFile()) {
2320       const SrcMgr::FileInfo &File = SLoc->getFile();
2321       AddSourceLocation(File.getIncludeLoc(), Record);
2322       Record.push_back(File.getFileCharacteristic()); // FIXME: stable encoding
2323       Record.push_back(File.hasLineDirectives());
2324 
2325       const SrcMgr::ContentCache *Content = File.getContentCache();
2326       bool EmitBlob = false;
2327       if (Content->OrigEntry) {
2328         assert(Content->OrigEntry == Content->ContentsEntry &&
2329                "Writing to AST an overridden file is not supported");
2330 
2331         // The source location entry is a file. Emit input file ID.
2332         assert(InputFileIDs[Content->OrigEntry] != 0 && "Missed file entry");
2333         Record.push_back(InputFileIDs[Content->OrigEntry]);
2334 
2335         Record.push_back(File.NumCreatedFIDs);
2336 
2337         FileDeclIDsTy::iterator FDI = FileDeclIDs.find(FID);
2338         if (FDI != FileDeclIDs.end()) {
2339           Record.push_back(FDI->second->FirstDeclIndex);
2340           Record.push_back(FDI->second->DeclIDs.size());
2341         } else {
2342           Record.push_back(0);
2343           Record.push_back(0);
2344         }
2345 
2346         Stream.EmitRecordWithAbbrev(SLocFileAbbrv, Record);
2347 
2348         if (Content->BufferOverridden || Content->IsTransient)
2349           EmitBlob = true;
2350       } else {
2351         // The source location entry is a buffer. The blob associated
2352         // with this entry contains the contents of the buffer.
2353 
2354         // We add one to the size so that we capture the trailing NULL
2355         // that is required by llvm::MemoryBuffer::getMemBuffer (on
2356         // the reader side).
2357         const llvm::MemoryBuffer *Buffer =
2358             Content->getBuffer(PP.getDiagnostics(), PP.getFileManager());
2359         StringRef Name = Buffer->getBufferIdentifier();
2360         Stream.EmitRecordWithBlob(SLocBufferAbbrv, Record,
2361                                   StringRef(Name.data(), Name.size() + 1));
2362         EmitBlob = true;
2363 
2364         if (Name == "<built-in>")
2365           PreloadSLocs.push_back(SLocEntryOffsets.size());
2366       }
2367 
2368       if (EmitBlob) {
2369         // Include the implicit terminating null character in the on-disk buffer
2370         // if we're writing it uncompressed.
2371         const llvm::MemoryBuffer *Buffer =
2372             Content->getBuffer(PP.getDiagnostics(), PP.getFileManager());
2373         StringRef Blob(Buffer->getBufferStart(), Buffer->getBufferSize() + 1);
2374         emitBlob(Stream, Blob, SLocBufferBlobCompressedAbbrv,
2375                  SLocBufferBlobAbbrv);
2376       }
2377     } else {
2378       // The source location entry is a macro expansion.
2379       const SrcMgr::ExpansionInfo &Expansion = SLoc->getExpansion();
2380       AddSourceLocation(Expansion.getSpellingLoc(), Record);
2381       AddSourceLocation(Expansion.getExpansionLocStart(), Record);
2382       AddSourceLocation(Expansion.isMacroArgExpansion()
2383                             ? SourceLocation()
2384                             : Expansion.getExpansionLocEnd(),
2385                         Record);
2386       Record.push_back(Expansion.isExpansionTokenRange());
2387 
2388       // Compute the token length for this macro expansion.
2389       unsigned NextOffset = SourceMgr.getNextLocalOffset();
2390       if (I + 1 != N)
2391         NextOffset = SourceMgr.getLocalSLocEntry(I + 1).getOffset();
2392       Record.push_back(NextOffset - SLoc->getOffset() - 1);
2393       Stream.EmitRecordWithAbbrev(SLocExpansionAbbrv, Record);
2394     }
2395   }
2396 
2397   Stream.ExitBlock();
2398 
2399   if (SLocEntryOffsets.empty())
2400     return;
2401 
2402   // Write the source-location offsets table into the AST block. This
2403   // table is used for lazily loading source-location information.
2404   using namespace llvm;
2405 
2406   auto Abbrev = std::make_shared<BitCodeAbbrev>();
2407   Abbrev->Add(BitCodeAbbrevOp(SOURCE_LOCATION_OFFSETS));
2408   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 16)); // # of slocs
2409   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 16)); // total size
2410   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // offsets
2411   unsigned SLocOffsetsAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
2412   {
2413     RecordData::value_type Record[] = {
2414         SOURCE_LOCATION_OFFSETS, SLocEntryOffsets.size(),
2415         SourceMgr.getNextLocalOffset() - 1 /* skip dummy */};
2416     Stream.EmitRecordWithBlob(SLocOffsetsAbbrev, Record,
2417                               bytes(SLocEntryOffsets));
2418   }
2419   // Write the source location entry preloads array, telling the AST
2420   // reader which source locations entries it should load eagerly.
2421   Stream.EmitRecord(SOURCE_LOCATION_PRELOADS, PreloadSLocs);
2422 
2423   // Write the line table. It depends on remapping working, so it must come
2424   // after the source location offsets.
2425   if (SourceMgr.hasLineTable()) {
2426     LineTableInfo &LineTable = SourceMgr.getLineTable();
2427 
2428     Record.clear();
2429 
2430     // Emit the needed file names.
2431     llvm::DenseMap<int, int> FilenameMap;
2432     FilenameMap[-1] = -1; // For unspecified filenames.
2433     for (const auto &L : LineTable) {
2434       if (L.first.ID < 0)
2435         continue;
2436       for (auto &LE : L.second) {
2437         if (FilenameMap.insert(std::make_pair(LE.FilenameID,
2438                                               FilenameMap.size() - 1)).second)
2439           AddPath(LineTable.getFilename(LE.FilenameID), Record);
2440       }
2441     }
2442     Record.push_back(0);
2443 
2444     // Emit the line entries
2445     for (const auto &L : LineTable) {
2446       // Only emit entries for local files.
2447       if (L.first.ID < 0)
2448         continue;
2449 
2450       // Emit the file ID
2451       Record.push_back(L.first.ID);
2452 
2453       // Emit the line entries
2454       Record.push_back(L.second.size());
2455       for (const auto &LE : L.second) {
2456         Record.push_back(LE.FileOffset);
2457         Record.push_back(LE.LineNo);
2458         Record.push_back(FilenameMap[LE.FilenameID]);
2459         Record.push_back((unsigned)LE.FileKind);
2460         Record.push_back(LE.IncludeOffset);
2461       }
2462     }
2463 
2464     Stream.EmitRecord(SOURCE_MANAGER_LINE_TABLE, Record);
2465   }
2466 }
2467 
2468 //===----------------------------------------------------------------------===//
2469 // Preprocessor Serialization
2470 //===----------------------------------------------------------------------===//
2471 
2472 static bool shouldIgnoreMacro(MacroDirective *MD, bool IsModule,
2473                               const Preprocessor &PP) {
2474   if (MacroInfo *MI = MD->getMacroInfo())
2475     if (MI->isBuiltinMacro())
2476       return true;
2477 
2478   if (IsModule) {
2479     SourceLocation Loc = MD->getLocation();
2480     if (Loc.isInvalid())
2481       return true;
2482     if (PP.getSourceManager().getFileID(Loc) == PP.getPredefinesFileID())
2483       return true;
2484   }
2485 
2486   return false;
2487 }
2488 
2489 /// Writes the block containing the serialized form of the
2490 /// preprocessor.
2491 void ASTWriter::WritePreprocessor(const Preprocessor &PP, bool IsModule) {
2492   PreprocessingRecord *PPRec = PP.getPreprocessingRecord();
2493   if (PPRec)
2494     WritePreprocessorDetail(*PPRec);
2495 
2496   RecordData Record;
2497   RecordData ModuleMacroRecord;
2498 
2499   // If the preprocessor __COUNTER__ value has been bumped, remember it.
2500   if (PP.getCounterValue() != 0) {
2501     RecordData::value_type Record[] = {PP.getCounterValue()};
2502     Stream.EmitRecord(PP_COUNTER_VALUE, Record);
2503   }
2504 
2505   if (PP.isRecordingPreamble() && PP.hasRecordedPreamble()) {
2506     assert(!IsModule);
2507     auto SkipInfo = PP.getPreambleSkipInfo();
2508     if (SkipInfo.hasValue()) {
2509       Record.push_back(true);
2510       AddSourceLocation(SkipInfo->HashTokenLoc, Record);
2511       AddSourceLocation(SkipInfo->IfTokenLoc, Record);
2512       Record.push_back(SkipInfo->FoundNonSkipPortion);
2513       Record.push_back(SkipInfo->FoundElse);
2514       AddSourceLocation(SkipInfo->ElseLoc, Record);
2515     } else {
2516       Record.push_back(false);
2517     }
2518     for (const auto &Cond : PP.getPreambleConditionalStack()) {
2519       AddSourceLocation(Cond.IfLoc, Record);
2520       Record.push_back(Cond.WasSkipping);
2521       Record.push_back(Cond.FoundNonSkip);
2522       Record.push_back(Cond.FoundElse);
2523     }
2524     Stream.EmitRecord(PP_CONDITIONAL_STACK, Record);
2525     Record.clear();
2526   }
2527 
2528   // Enter the preprocessor block.
2529   Stream.EnterSubblock(PREPROCESSOR_BLOCK_ID, 3);
2530 
2531   // If the AST file contains __DATE__ or __TIME__ emit a warning about this.
2532   // FIXME: Include a location for the use, and say which one was used.
2533   if (PP.SawDateOrTime())
2534     PP.Diag(SourceLocation(), diag::warn_module_uses_date_time) << IsModule;
2535 
2536   // Loop over all the macro directives that are live at the end of the file,
2537   // emitting each to the PP section.
2538 
2539   // Construct the list of identifiers with macro directives that need to be
2540   // serialized.
2541   SmallVector<const IdentifierInfo *, 128> MacroIdentifiers;
2542   for (auto &Id : PP.getIdentifierTable())
2543     if (Id.second->hadMacroDefinition() &&
2544         (!Id.second->isFromAST() ||
2545          Id.second->hasChangedSinceDeserialization()))
2546       MacroIdentifiers.push_back(Id.second);
2547   // Sort the set of macro definitions that need to be serialized by the
2548   // name of the macro, to provide a stable ordering.
2549   llvm::sort(MacroIdentifiers, llvm::deref<std::less<>>());
2550 
2551   // Emit the macro directives as a list and associate the offset with the
2552   // identifier they belong to.
2553   for (const IdentifierInfo *Name : MacroIdentifiers) {
2554     MacroDirective *MD = PP.getLocalMacroDirectiveHistory(Name);
2555     auto StartOffset = Stream.GetCurrentBitNo();
2556 
2557     // Emit the macro directives in reverse source order.
2558     for (; MD; MD = MD->getPrevious()) {
2559       // Once we hit an ignored macro, we're done: the rest of the chain
2560       // will all be ignored macros.
2561       if (shouldIgnoreMacro(MD, IsModule, PP))
2562         break;
2563 
2564       AddSourceLocation(MD->getLocation(), Record);
2565       Record.push_back(MD->getKind());
2566       if (auto *DefMD = dyn_cast<DefMacroDirective>(MD)) {
2567         Record.push_back(getMacroRef(DefMD->getInfo(), Name));
2568       } else if (auto *VisMD = dyn_cast<VisibilityMacroDirective>(MD)) {
2569         Record.push_back(VisMD->isPublic());
2570       }
2571     }
2572 
2573     // Write out any exported module macros.
2574     bool EmittedModuleMacros = false;
2575     // We write out exported module macros for PCH as well.
2576     auto Leafs = PP.getLeafModuleMacros(Name);
2577     SmallVector<ModuleMacro*, 8> Worklist(Leafs.begin(), Leafs.end());
2578     llvm::DenseMap<ModuleMacro*, unsigned> Visits;
2579     while (!Worklist.empty()) {
2580       auto *Macro = Worklist.pop_back_val();
2581 
2582       // Emit a record indicating this submodule exports this macro.
2583       ModuleMacroRecord.push_back(
2584           getSubmoduleID(Macro->getOwningModule()));
2585       ModuleMacroRecord.push_back(getMacroRef(Macro->getMacroInfo(), Name));
2586       for (auto *M : Macro->overrides())
2587         ModuleMacroRecord.push_back(getSubmoduleID(M->getOwningModule()));
2588 
2589       Stream.EmitRecord(PP_MODULE_MACRO, ModuleMacroRecord);
2590       ModuleMacroRecord.clear();
2591 
2592       // Enqueue overridden macros once we've visited all their ancestors.
2593       for (auto *M : Macro->overrides())
2594         if (++Visits[M] == M->getNumOverridingMacros())
2595           Worklist.push_back(M);
2596 
2597       EmittedModuleMacros = true;
2598     }
2599 
2600     if (Record.empty() && !EmittedModuleMacros)
2601       continue;
2602 
2603     IdentMacroDirectivesOffsetMap[Name] = StartOffset;
2604     Stream.EmitRecord(PP_MACRO_DIRECTIVE_HISTORY, Record);
2605     Record.clear();
2606   }
2607 
2608   /// Offsets of each of the macros into the bitstream, indexed by
2609   /// the local macro ID
2610   ///
2611   /// For each identifier that is associated with a macro, this map
2612   /// provides the offset into the bitstream where that macro is
2613   /// defined.
2614   std::vector<uint32_t> MacroOffsets;
2615 
2616   for (unsigned I = 0, N = MacroInfosToEmit.size(); I != N; ++I) {
2617     const IdentifierInfo *Name = MacroInfosToEmit[I].Name;
2618     MacroInfo *MI = MacroInfosToEmit[I].MI;
2619     MacroID ID = MacroInfosToEmit[I].ID;
2620 
2621     if (ID < FirstMacroID) {
2622       assert(0 && "Loaded MacroInfo entered MacroInfosToEmit ?");
2623       continue;
2624     }
2625 
2626     // Record the local offset of this macro.
2627     unsigned Index = ID - FirstMacroID;
2628     if (Index == MacroOffsets.size())
2629       MacroOffsets.push_back(Stream.GetCurrentBitNo());
2630     else {
2631       if (Index > MacroOffsets.size())
2632         MacroOffsets.resize(Index + 1);
2633 
2634       MacroOffsets[Index] = Stream.GetCurrentBitNo();
2635     }
2636 
2637     AddIdentifierRef(Name, Record);
2638     AddSourceLocation(MI->getDefinitionLoc(), Record);
2639     AddSourceLocation(MI->getDefinitionEndLoc(), Record);
2640     Record.push_back(MI->isUsed());
2641     Record.push_back(MI->isUsedForHeaderGuard());
2642     unsigned Code;
2643     if (MI->isObjectLike()) {
2644       Code = PP_MACRO_OBJECT_LIKE;
2645     } else {
2646       Code = PP_MACRO_FUNCTION_LIKE;
2647 
2648       Record.push_back(MI->isC99Varargs());
2649       Record.push_back(MI->isGNUVarargs());
2650       Record.push_back(MI->hasCommaPasting());
2651       Record.push_back(MI->getNumParams());
2652       for (const IdentifierInfo *Param : MI->params())
2653         AddIdentifierRef(Param, Record);
2654     }
2655 
2656     // If we have a detailed preprocessing record, record the macro definition
2657     // ID that corresponds to this macro.
2658     if (PPRec)
2659       Record.push_back(MacroDefinitions[PPRec->findMacroDefinition(MI)]);
2660 
2661     Stream.EmitRecord(Code, Record);
2662     Record.clear();
2663 
2664     // Emit the tokens array.
2665     for (unsigned TokNo = 0, e = MI->getNumTokens(); TokNo != e; ++TokNo) {
2666       // Note that we know that the preprocessor does not have any annotation
2667       // tokens in it because they are created by the parser, and thus can't
2668       // be in a macro definition.
2669       const Token &Tok = MI->getReplacementToken(TokNo);
2670       AddToken(Tok, Record);
2671       Stream.EmitRecord(PP_TOKEN, Record);
2672       Record.clear();
2673     }
2674     ++NumMacros;
2675   }
2676 
2677   Stream.ExitBlock();
2678 
2679   // Write the offsets table for macro IDs.
2680   using namespace llvm;
2681 
2682   auto Abbrev = std::make_shared<BitCodeAbbrev>();
2683   Abbrev->Add(BitCodeAbbrevOp(MACRO_OFFSET));
2684   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // # of macros
2685   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // first ID
2686   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2687 
2688   unsigned MacroOffsetAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
2689   {
2690     RecordData::value_type Record[] = {MACRO_OFFSET, MacroOffsets.size(),
2691                                        FirstMacroID - NUM_PREDEF_MACRO_IDS};
2692     Stream.EmitRecordWithBlob(MacroOffsetAbbrev, Record, bytes(MacroOffsets));
2693   }
2694 }
2695 
2696 void ASTWriter::WritePreprocessorDetail(PreprocessingRecord &PPRec) {
2697   if (PPRec.local_begin() == PPRec.local_end())
2698     return;
2699 
2700   SmallVector<PPEntityOffset, 64> PreprocessedEntityOffsets;
2701 
2702   // Enter the preprocessor block.
2703   Stream.EnterSubblock(PREPROCESSOR_DETAIL_BLOCK_ID, 3);
2704 
2705   // If the preprocessor has a preprocessing record, emit it.
2706   unsigned NumPreprocessingRecords = 0;
2707   using namespace llvm;
2708 
2709   // Set up the abbreviation for
2710   unsigned InclusionAbbrev = 0;
2711   {
2712     auto Abbrev = std::make_shared<BitCodeAbbrev>();
2713     Abbrev->Add(BitCodeAbbrevOp(PPD_INCLUSION_DIRECTIVE));
2714     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // filename length
2715     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // in quotes
2716     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // kind
2717     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // imported module
2718     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2719     InclusionAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
2720   }
2721 
2722   unsigned FirstPreprocessorEntityID
2723     = (Chain ? PPRec.getNumLoadedPreprocessedEntities() : 0)
2724     + NUM_PREDEF_PP_ENTITY_IDS;
2725   unsigned NextPreprocessorEntityID = FirstPreprocessorEntityID;
2726   RecordData Record;
2727   for (PreprocessingRecord::iterator E = PPRec.local_begin(),
2728                                   EEnd = PPRec.local_end();
2729        E != EEnd;
2730        (void)++E, ++NumPreprocessingRecords, ++NextPreprocessorEntityID) {
2731     Record.clear();
2732 
2733     PreprocessedEntityOffsets.push_back(
2734         PPEntityOffset((*E)->getSourceRange(), Stream.GetCurrentBitNo()));
2735 
2736     if (auto *MD = dyn_cast<MacroDefinitionRecord>(*E)) {
2737       // Record this macro definition's ID.
2738       MacroDefinitions[MD] = NextPreprocessorEntityID;
2739 
2740       AddIdentifierRef(MD->getName(), Record);
2741       Stream.EmitRecord(PPD_MACRO_DEFINITION, Record);
2742       continue;
2743     }
2744 
2745     if (auto *ME = dyn_cast<MacroExpansion>(*E)) {
2746       Record.push_back(ME->isBuiltinMacro());
2747       if (ME->isBuiltinMacro())
2748         AddIdentifierRef(ME->getName(), Record);
2749       else
2750         Record.push_back(MacroDefinitions[ME->getDefinition()]);
2751       Stream.EmitRecord(PPD_MACRO_EXPANSION, Record);
2752       continue;
2753     }
2754 
2755     if (auto *ID = dyn_cast<InclusionDirective>(*E)) {
2756       Record.push_back(PPD_INCLUSION_DIRECTIVE);
2757       Record.push_back(ID->getFileName().size());
2758       Record.push_back(ID->wasInQuotes());
2759       Record.push_back(static_cast<unsigned>(ID->getKind()));
2760       Record.push_back(ID->importedModule());
2761       SmallString<64> Buffer;
2762       Buffer += ID->getFileName();
2763       // Check that the FileEntry is not null because it was not resolved and
2764       // we create a PCH even with compiler errors.
2765       if (ID->getFile())
2766         Buffer += ID->getFile()->getName();
2767       Stream.EmitRecordWithBlob(InclusionAbbrev, Record, Buffer);
2768       continue;
2769     }
2770 
2771     llvm_unreachable("Unhandled PreprocessedEntity in ASTWriter");
2772   }
2773   Stream.ExitBlock();
2774 
2775   // Write the offsets table for the preprocessing record.
2776   if (NumPreprocessingRecords > 0) {
2777     assert(PreprocessedEntityOffsets.size() == NumPreprocessingRecords);
2778 
2779     // Write the offsets table for identifier IDs.
2780     using namespace llvm;
2781 
2782     auto Abbrev = std::make_shared<BitCodeAbbrev>();
2783     Abbrev->Add(BitCodeAbbrevOp(PPD_ENTITIES_OFFSETS));
2784     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // first pp entity
2785     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2786     unsigned PPEOffsetAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
2787 
2788     RecordData::value_type Record[] = {PPD_ENTITIES_OFFSETS,
2789                                        FirstPreprocessorEntityID -
2790                                            NUM_PREDEF_PP_ENTITY_IDS};
2791     Stream.EmitRecordWithBlob(PPEOffsetAbbrev, Record,
2792                               bytes(PreprocessedEntityOffsets));
2793   }
2794 
2795   // Write the skipped region table for the preprocessing record.
2796   ArrayRef<SourceRange> SkippedRanges = PPRec.getSkippedRanges();
2797   if (SkippedRanges.size() > 0) {
2798     std::vector<PPSkippedRange> SerializedSkippedRanges;
2799     SerializedSkippedRanges.reserve(SkippedRanges.size());
2800     for (auto const& Range : SkippedRanges)
2801       SerializedSkippedRanges.emplace_back(Range);
2802 
2803     using namespace llvm;
2804     auto Abbrev = std::make_shared<BitCodeAbbrev>();
2805     Abbrev->Add(BitCodeAbbrevOp(PPD_SKIPPED_RANGES));
2806     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2807     unsigned PPESkippedRangeAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
2808 
2809     Record.clear();
2810     Record.push_back(PPD_SKIPPED_RANGES);
2811     Stream.EmitRecordWithBlob(PPESkippedRangeAbbrev, Record,
2812                               bytes(SerializedSkippedRanges));
2813   }
2814 }
2815 
2816 unsigned ASTWriter::getLocalOrImportedSubmoduleID(Module *Mod) {
2817   if (!Mod)
2818     return 0;
2819 
2820   llvm::DenseMap<Module *, unsigned>::iterator Known = SubmoduleIDs.find(Mod);
2821   if (Known != SubmoduleIDs.end())
2822     return Known->second;
2823 
2824   auto *Top = Mod->getTopLevelModule();
2825   if (Top != WritingModule &&
2826       (getLangOpts().CompilingPCH ||
2827        !Top->fullModuleNameIs(StringRef(getLangOpts().CurrentModule))))
2828     return 0;
2829 
2830   return SubmoduleIDs[Mod] = NextSubmoduleID++;
2831 }
2832 
2833 unsigned ASTWriter::getSubmoduleID(Module *Mod) {
2834   // FIXME: This can easily happen, if we have a reference to a submodule that
2835   // did not result in us loading a module file for that submodule. For
2836   // instance, a cross-top-level-module 'conflict' declaration will hit this.
2837   unsigned ID = getLocalOrImportedSubmoduleID(Mod);
2838   assert((ID || !Mod) &&
2839          "asked for module ID for non-local, non-imported module");
2840   return ID;
2841 }
2842 
2843 /// Compute the number of modules within the given tree (including the
2844 /// given module).
2845 static unsigned getNumberOfModules(Module *Mod) {
2846   unsigned ChildModules = 0;
2847   for (auto Sub = Mod->submodule_begin(), SubEnd = Mod->submodule_end();
2848        Sub != SubEnd; ++Sub)
2849     ChildModules += getNumberOfModules(*Sub);
2850 
2851   return ChildModules + 1;
2852 }
2853 
2854 void ASTWriter::WriteSubmodules(Module *WritingModule) {
2855   // Enter the submodule description block.
2856   Stream.EnterSubblock(SUBMODULE_BLOCK_ID, /*bits for abbreviations*/5);
2857 
2858   // Write the abbreviations needed for the submodules block.
2859   using namespace llvm;
2860 
2861   auto Abbrev = std::make_shared<BitCodeAbbrev>();
2862   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_DEFINITION));
2863   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ID
2864   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Parent
2865   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // Kind
2866   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFramework
2867   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsExplicit
2868   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsSystem
2869   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsExternC
2870   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InferSubmodules...
2871   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InferExplicit...
2872   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InferExportWild...
2873   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ConfigMacrosExh...
2874   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ModuleMapIsPriv...
2875   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
2876   unsigned DefinitionAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
2877 
2878   Abbrev = std::make_shared<BitCodeAbbrev>();
2879   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_UMBRELLA_HEADER));
2880   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
2881   unsigned UmbrellaAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
2882 
2883   Abbrev = std::make_shared<BitCodeAbbrev>();
2884   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_HEADER));
2885   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
2886   unsigned HeaderAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
2887 
2888   Abbrev = std::make_shared<BitCodeAbbrev>();
2889   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_TOPHEADER));
2890   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
2891   unsigned TopHeaderAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
2892 
2893   Abbrev = std::make_shared<BitCodeAbbrev>();
2894   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_UMBRELLA_DIR));
2895   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
2896   unsigned UmbrellaDirAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
2897 
2898   Abbrev = std::make_shared<BitCodeAbbrev>();
2899   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_REQUIRES));
2900   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // State
2901   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));     // Feature
2902   unsigned RequiresAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
2903 
2904   Abbrev = std::make_shared<BitCodeAbbrev>();
2905   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_EXCLUDED_HEADER));
2906   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
2907   unsigned ExcludedHeaderAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
2908 
2909   Abbrev = std::make_shared<BitCodeAbbrev>();
2910   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_TEXTUAL_HEADER));
2911   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
2912   unsigned TextualHeaderAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
2913 
2914   Abbrev = std::make_shared<BitCodeAbbrev>();
2915   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_PRIVATE_HEADER));
2916   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
2917   unsigned PrivateHeaderAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
2918 
2919   Abbrev = std::make_shared<BitCodeAbbrev>();
2920   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_PRIVATE_TEXTUAL_HEADER));
2921   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
2922   unsigned PrivateTextualHeaderAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
2923 
2924   Abbrev = std::make_shared<BitCodeAbbrev>();
2925   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_LINK_LIBRARY));
2926   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFramework
2927   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));     // Name
2928   unsigned LinkLibraryAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
2929 
2930   Abbrev = std::make_shared<BitCodeAbbrev>();
2931   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_CONFIG_MACRO));
2932   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));    // Macro name
2933   unsigned ConfigMacroAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
2934 
2935   Abbrev = std::make_shared<BitCodeAbbrev>();
2936   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_CONFLICT));
2937   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));  // Other module
2938   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));    // Message
2939   unsigned ConflictAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
2940 
2941   Abbrev = std::make_shared<BitCodeAbbrev>();
2942   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_EXPORT_AS));
2943   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));    // Macro name
2944   unsigned ExportAsAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
2945 
2946   // Write the submodule metadata block.
2947   RecordData::value_type Record[] = {
2948       getNumberOfModules(WritingModule),
2949       FirstSubmoduleID - NUM_PREDEF_SUBMODULE_IDS};
2950   Stream.EmitRecord(SUBMODULE_METADATA, Record);
2951 
2952   // Write all of the submodules.
2953   std::queue<Module *> Q;
2954   Q.push(WritingModule);
2955   while (!Q.empty()) {
2956     Module *Mod = Q.front();
2957     Q.pop();
2958     unsigned ID = getSubmoduleID(Mod);
2959 
2960     uint64_t ParentID = 0;
2961     if (Mod->Parent) {
2962       assert(SubmoduleIDs[Mod->Parent] && "Submodule parent not written?");
2963       ParentID = SubmoduleIDs[Mod->Parent];
2964     }
2965 
2966     // Emit the definition of the block.
2967     {
2968       RecordData::value_type Record[] = {SUBMODULE_DEFINITION,
2969                                          ID,
2970                                          ParentID,
2971                                          (RecordData::value_type)Mod->Kind,
2972                                          Mod->IsFramework,
2973                                          Mod->IsExplicit,
2974                                          Mod->IsSystem,
2975                                          Mod->IsExternC,
2976                                          Mod->InferSubmodules,
2977                                          Mod->InferExplicitSubmodules,
2978                                          Mod->InferExportWildcard,
2979                                          Mod->ConfigMacrosExhaustive,
2980                                          Mod->ModuleMapIsPrivate};
2981       Stream.EmitRecordWithBlob(DefinitionAbbrev, Record, Mod->Name);
2982     }
2983 
2984     // Emit the requirements.
2985     for (const auto &R : Mod->Requirements) {
2986       RecordData::value_type Record[] = {SUBMODULE_REQUIRES, R.second};
2987       Stream.EmitRecordWithBlob(RequiresAbbrev, Record, R.first);
2988     }
2989 
2990     // Emit the umbrella header, if there is one.
2991     if (auto UmbrellaHeader = Mod->getUmbrellaHeader()) {
2992       RecordData::value_type Record[] = {SUBMODULE_UMBRELLA_HEADER};
2993       Stream.EmitRecordWithBlob(UmbrellaAbbrev, Record,
2994                                 UmbrellaHeader.NameAsWritten);
2995     } else if (auto UmbrellaDir = Mod->getUmbrellaDir()) {
2996       RecordData::value_type Record[] = {SUBMODULE_UMBRELLA_DIR};
2997       Stream.EmitRecordWithBlob(UmbrellaDirAbbrev, Record,
2998                                 UmbrellaDir.NameAsWritten);
2999     }
3000 
3001     // Emit the headers.
3002     struct {
3003       unsigned RecordKind;
3004       unsigned Abbrev;
3005       Module::HeaderKind HeaderKind;
3006     } HeaderLists[] = {
3007       {SUBMODULE_HEADER, HeaderAbbrev, Module::HK_Normal},
3008       {SUBMODULE_TEXTUAL_HEADER, TextualHeaderAbbrev, Module::HK_Textual},
3009       {SUBMODULE_PRIVATE_HEADER, PrivateHeaderAbbrev, Module::HK_Private},
3010       {SUBMODULE_PRIVATE_TEXTUAL_HEADER, PrivateTextualHeaderAbbrev,
3011         Module::HK_PrivateTextual},
3012       {SUBMODULE_EXCLUDED_HEADER, ExcludedHeaderAbbrev, Module::HK_Excluded}
3013     };
3014     for (auto &HL : HeaderLists) {
3015       RecordData::value_type Record[] = {HL.RecordKind};
3016       for (auto &H : Mod->Headers[HL.HeaderKind])
3017         Stream.EmitRecordWithBlob(HL.Abbrev, Record, H.NameAsWritten);
3018     }
3019 
3020     // Emit the top headers.
3021     {
3022       auto TopHeaders = Mod->getTopHeaders(PP->getFileManager());
3023       RecordData::value_type Record[] = {SUBMODULE_TOPHEADER};
3024       for (auto *H : TopHeaders)
3025         Stream.EmitRecordWithBlob(TopHeaderAbbrev, Record, H->getName());
3026     }
3027 
3028     // Emit the imports.
3029     if (!Mod->Imports.empty()) {
3030       RecordData Record;
3031       for (auto *I : Mod->Imports)
3032         Record.push_back(getSubmoduleID(I));
3033       Stream.EmitRecord(SUBMODULE_IMPORTS, Record);
3034     }
3035 
3036     // Emit the exports.
3037     if (!Mod->Exports.empty()) {
3038       RecordData Record;
3039       for (const auto &E : Mod->Exports) {
3040         // FIXME: This may fail; we don't require that all exported modules
3041         // are local or imported.
3042         Record.push_back(getSubmoduleID(E.getPointer()));
3043         Record.push_back(E.getInt());
3044       }
3045       Stream.EmitRecord(SUBMODULE_EXPORTS, Record);
3046     }
3047 
3048     //FIXME: How do we emit the 'use'd modules?  They may not be submodules.
3049     // Might be unnecessary as use declarations are only used to build the
3050     // module itself.
3051 
3052     // Emit the link libraries.
3053     for (const auto &LL : Mod->LinkLibraries) {
3054       RecordData::value_type Record[] = {SUBMODULE_LINK_LIBRARY,
3055                                          LL.IsFramework};
3056       Stream.EmitRecordWithBlob(LinkLibraryAbbrev, Record, LL.Library);
3057     }
3058 
3059     // Emit the conflicts.
3060     for (const auto &C : Mod->Conflicts) {
3061       // FIXME: This may fail; we don't require that all conflicting modules
3062       // are local or imported.
3063       RecordData::value_type Record[] = {SUBMODULE_CONFLICT,
3064                                          getSubmoduleID(C.Other)};
3065       Stream.EmitRecordWithBlob(ConflictAbbrev, Record, C.Message);
3066     }
3067 
3068     // Emit the configuration macros.
3069     for (const auto &CM : Mod->ConfigMacros) {
3070       RecordData::value_type Record[] = {SUBMODULE_CONFIG_MACRO};
3071       Stream.EmitRecordWithBlob(ConfigMacroAbbrev, Record, CM);
3072     }
3073 
3074     // Emit the initializers, if any.
3075     RecordData Inits;
3076     for (Decl *D : Context->getModuleInitializers(Mod))
3077       Inits.push_back(GetDeclRef(D));
3078     if (!Inits.empty())
3079       Stream.EmitRecord(SUBMODULE_INITIALIZERS, Inits);
3080 
3081     // Emit the name of the re-exported module, if any.
3082     if (!Mod->ExportAsModule.empty()) {
3083       RecordData::value_type Record[] = {SUBMODULE_EXPORT_AS};
3084       Stream.EmitRecordWithBlob(ExportAsAbbrev, Record, Mod->ExportAsModule);
3085     }
3086 
3087     // Queue up the submodules of this module.
3088     for (auto *M : Mod->submodules())
3089       Q.push(M);
3090   }
3091 
3092   Stream.ExitBlock();
3093 
3094   assert((NextSubmoduleID - FirstSubmoduleID ==
3095           getNumberOfModules(WritingModule)) &&
3096          "Wrong # of submodules; found a reference to a non-local, "
3097          "non-imported submodule?");
3098 }
3099 
3100 void ASTWriter::WritePragmaDiagnosticMappings(const DiagnosticsEngine &Diag,
3101                                               bool isModule) {
3102   llvm::SmallDenseMap<const DiagnosticsEngine::DiagState *, unsigned, 64>
3103       DiagStateIDMap;
3104   unsigned CurrID = 0;
3105   RecordData Record;
3106 
3107   auto EncodeDiagStateFlags =
3108       [](const DiagnosticsEngine::DiagState *DS) -> unsigned {
3109     unsigned Result = (unsigned)DS->ExtBehavior;
3110     for (unsigned Val :
3111          {(unsigned)DS->IgnoreAllWarnings, (unsigned)DS->EnableAllWarnings,
3112           (unsigned)DS->WarningsAsErrors, (unsigned)DS->ErrorsAsFatal,
3113           (unsigned)DS->SuppressSystemWarnings})
3114       Result = (Result << 1) | Val;
3115     return Result;
3116   };
3117 
3118   unsigned Flags = EncodeDiagStateFlags(Diag.DiagStatesByLoc.FirstDiagState);
3119   Record.push_back(Flags);
3120 
3121   auto AddDiagState = [&](const DiagnosticsEngine::DiagState *State,
3122                           bool IncludeNonPragmaStates) {
3123     // Ensure that the diagnostic state wasn't modified since it was created.
3124     // We will not correctly round-trip this information otherwise.
3125     assert(Flags == EncodeDiagStateFlags(State) &&
3126            "diag state flags vary in single AST file");
3127 
3128     unsigned &DiagStateID = DiagStateIDMap[State];
3129     Record.push_back(DiagStateID);
3130 
3131     if (DiagStateID == 0) {
3132       DiagStateID = ++CurrID;
3133 
3134       // Add a placeholder for the number of mappings.
3135       auto SizeIdx = Record.size();
3136       Record.emplace_back();
3137       for (const auto &I : *State) {
3138         if (I.second.isPragma() || IncludeNonPragmaStates) {
3139           Record.push_back(I.first);
3140           Record.push_back(I.second.serialize());
3141         }
3142       }
3143       // Update the placeholder.
3144       Record[SizeIdx] = (Record.size() - SizeIdx) / 2;
3145     }
3146   };
3147 
3148   AddDiagState(Diag.DiagStatesByLoc.FirstDiagState, isModule);
3149 
3150   // Reserve a spot for the number of locations with state transitions.
3151   auto NumLocationsIdx = Record.size();
3152   Record.emplace_back();
3153 
3154   // Emit the state transitions.
3155   unsigned NumLocations = 0;
3156   for (auto &FileIDAndFile : Diag.DiagStatesByLoc.Files) {
3157     if (!FileIDAndFile.first.isValid() ||
3158         !FileIDAndFile.second.HasLocalTransitions)
3159       continue;
3160     ++NumLocations;
3161 
3162     SourceLocation Loc = Diag.SourceMgr->getComposedLoc(FileIDAndFile.first, 0);
3163     assert(!Loc.isInvalid() && "start loc for valid FileID is invalid");
3164     AddSourceLocation(Loc, Record);
3165 
3166     Record.push_back(FileIDAndFile.second.StateTransitions.size());
3167     for (auto &StatePoint : FileIDAndFile.second.StateTransitions) {
3168       Record.push_back(StatePoint.Offset);
3169       AddDiagState(StatePoint.State, false);
3170     }
3171   }
3172 
3173   // Backpatch the number of locations.
3174   Record[NumLocationsIdx] = NumLocations;
3175 
3176   // Emit CurDiagStateLoc.  Do it last in order to match source order.
3177   //
3178   // This also protects against a hypothetical corner case with simulating
3179   // -Werror settings for implicit modules in the ASTReader, where reading
3180   // CurDiagState out of context could change whether warning pragmas are
3181   // treated as errors.
3182   AddSourceLocation(Diag.DiagStatesByLoc.CurDiagStateLoc, Record);
3183   AddDiagState(Diag.DiagStatesByLoc.CurDiagState, false);
3184 
3185   Stream.EmitRecord(DIAG_PRAGMA_MAPPINGS, Record);
3186 }
3187 
3188 //===----------------------------------------------------------------------===//
3189 // Type Serialization
3190 //===----------------------------------------------------------------------===//
3191 
3192 /// Write the representation of a type to the AST stream.
3193 void ASTWriter::WriteType(QualType T) {
3194   TypeIdx &IdxRef = TypeIdxs[T];
3195   if (IdxRef.getIndex() == 0) // we haven't seen this type before.
3196     IdxRef = TypeIdx(NextTypeID++);
3197   TypeIdx Idx = IdxRef;
3198 
3199   assert(Idx.getIndex() >= FirstTypeID && "Re-writing a type from a prior AST");
3200 
3201   RecordData Record;
3202 
3203   // Emit the type's representation.
3204   ASTTypeWriter W(*this, Record);
3205   W.Visit(T);
3206   uint64_t Offset = W.Emit();
3207 
3208   // Record the offset for this type.
3209   unsigned Index = Idx.getIndex() - FirstTypeID;
3210   if (TypeOffsets.size() == Index)
3211     TypeOffsets.push_back(Offset);
3212   else if (TypeOffsets.size() < Index) {
3213     TypeOffsets.resize(Index + 1);
3214     TypeOffsets[Index] = Offset;
3215   } else {
3216     llvm_unreachable("Types emitted in wrong order");
3217   }
3218 }
3219 
3220 //===----------------------------------------------------------------------===//
3221 // Declaration Serialization
3222 //===----------------------------------------------------------------------===//
3223 
3224 /// Write the block containing all of the declaration IDs
3225 /// lexically declared within the given DeclContext.
3226 ///
3227 /// \returns the offset of the DECL_CONTEXT_LEXICAL block within the
3228 /// bitstream, or 0 if no block was written.
3229 uint64_t ASTWriter::WriteDeclContextLexicalBlock(ASTContext &Context,
3230                                                  DeclContext *DC) {
3231   if (DC->decls_empty())
3232     return 0;
3233 
3234   uint64_t Offset = Stream.GetCurrentBitNo();
3235   SmallVector<uint32_t, 128> KindDeclPairs;
3236   for (const auto *D : DC->decls()) {
3237     KindDeclPairs.push_back(D->getKind());
3238     KindDeclPairs.push_back(GetDeclRef(D));
3239   }
3240 
3241   ++NumLexicalDeclContexts;
3242   RecordData::value_type Record[] = {DECL_CONTEXT_LEXICAL};
3243   Stream.EmitRecordWithBlob(DeclContextLexicalAbbrev, Record,
3244                             bytes(KindDeclPairs));
3245   return Offset;
3246 }
3247 
3248 void ASTWriter::WriteTypeDeclOffsets() {
3249   using namespace llvm;
3250 
3251   // Write the type offsets array
3252   auto Abbrev = std::make_shared<BitCodeAbbrev>();
3253   Abbrev->Add(BitCodeAbbrevOp(TYPE_OFFSET));
3254   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // # of types
3255   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // base type index
3256   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // types block
3257   unsigned TypeOffsetAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
3258   {
3259     RecordData::value_type Record[] = {TYPE_OFFSET, TypeOffsets.size(),
3260                                        FirstTypeID - NUM_PREDEF_TYPE_IDS};
3261     Stream.EmitRecordWithBlob(TypeOffsetAbbrev, Record, bytes(TypeOffsets));
3262   }
3263 
3264   // Write the declaration offsets array
3265   Abbrev = std::make_shared<BitCodeAbbrev>();
3266   Abbrev->Add(BitCodeAbbrevOp(DECL_OFFSET));
3267   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // # of declarations
3268   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // base decl ID
3269   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // declarations block
3270   unsigned DeclOffsetAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
3271   {
3272     RecordData::value_type Record[] = {DECL_OFFSET, DeclOffsets.size(),
3273                                        FirstDeclID - NUM_PREDEF_DECL_IDS};
3274     Stream.EmitRecordWithBlob(DeclOffsetAbbrev, Record, bytes(DeclOffsets));
3275   }
3276 }
3277 
3278 void ASTWriter::WriteFileDeclIDsMap() {
3279   using namespace llvm;
3280 
3281   SmallVector<std::pair<FileID, DeclIDInFileInfo *>, 64> SortedFileDeclIDs(
3282       FileDeclIDs.begin(), FileDeclIDs.end());
3283   llvm::sort(SortedFileDeclIDs, llvm::less_first());
3284 
3285   // Join the vectors of DeclIDs from all files.
3286   SmallVector<DeclID, 256> FileGroupedDeclIDs;
3287   for (auto &FileDeclEntry : SortedFileDeclIDs) {
3288     DeclIDInFileInfo &Info = *FileDeclEntry.second;
3289     Info.FirstDeclIndex = FileGroupedDeclIDs.size();
3290     for (auto &LocDeclEntry : Info.DeclIDs)
3291       FileGroupedDeclIDs.push_back(LocDeclEntry.second);
3292   }
3293 
3294   auto Abbrev = std::make_shared<BitCodeAbbrev>();
3295   Abbrev->Add(BitCodeAbbrevOp(FILE_SORTED_DECLS));
3296   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3297   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
3298   unsigned AbbrevCode = Stream.EmitAbbrev(std::move(Abbrev));
3299   RecordData::value_type Record[] = {FILE_SORTED_DECLS,
3300                                      FileGroupedDeclIDs.size()};
3301   Stream.EmitRecordWithBlob(AbbrevCode, Record, bytes(FileGroupedDeclIDs));
3302 }
3303 
3304 void ASTWriter::WriteComments() {
3305   Stream.EnterSubblock(COMMENTS_BLOCK_ID, 3);
3306   auto _ = llvm::make_scope_exit([this] { Stream.ExitBlock(); });
3307   if (!PP->getPreprocessorOpts().WriteCommentListToPCH)
3308     return;
3309   RecordData Record;
3310   for (const auto &FO : Context->Comments.OrderedComments) {
3311     for (const auto &OC : FO.second) {
3312       const RawComment *I = OC.second;
3313       Record.clear();
3314       AddSourceRange(I->getSourceRange(), Record);
3315       Record.push_back(I->getKind());
3316       Record.push_back(I->isTrailingComment());
3317       Record.push_back(I->isAlmostTrailingComment());
3318       Stream.EmitRecord(COMMENTS_RAW_COMMENT, Record);
3319     }
3320   }
3321 }
3322 
3323 //===----------------------------------------------------------------------===//
3324 // Global Method Pool and Selector Serialization
3325 //===----------------------------------------------------------------------===//
3326 
3327 namespace {
3328 
3329 // Trait used for the on-disk hash table used in the method pool.
3330 class ASTMethodPoolTrait {
3331   ASTWriter &Writer;
3332 
3333 public:
3334   using key_type = Selector;
3335   using key_type_ref = key_type;
3336 
3337   struct data_type {
3338     SelectorID ID;
3339     ObjCMethodList Instance, Factory;
3340   };
3341   using data_type_ref = const data_type &;
3342 
3343   using hash_value_type = unsigned;
3344   using offset_type = unsigned;
3345 
3346   explicit ASTMethodPoolTrait(ASTWriter &Writer) : Writer(Writer) {}
3347 
3348   static hash_value_type ComputeHash(Selector Sel) {
3349     return serialization::ComputeHash(Sel);
3350   }
3351 
3352   std::pair<unsigned, unsigned>
3353     EmitKeyDataLength(raw_ostream& Out, Selector Sel,
3354                       data_type_ref Methods) {
3355     using namespace llvm::support;
3356 
3357     endian::Writer LE(Out, little);
3358     unsigned KeyLen = 2 + (Sel.getNumArgs()? Sel.getNumArgs() * 4 : 4);
3359     LE.write<uint16_t>(KeyLen);
3360     unsigned DataLen = 4 + 2 + 2; // 2 bytes for each of the method counts
3361     for (const ObjCMethodList *Method = &Methods.Instance; Method;
3362          Method = Method->getNext())
3363       if (Method->getMethod())
3364         DataLen += 4;
3365     for (const ObjCMethodList *Method = &Methods.Factory; Method;
3366          Method = Method->getNext())
3367       if (Method->getMethod())
3368         DataLen += 4;
3369     LE.write<uint16_t>(DataLen);
3370     return std::make_pair(KeyLen, DataLen);
3371   }
3372 
3373   void EmitKey(raw_ostream& Out, Selector Sel, unsigned) {
3374     using namespace llvm::support;
3375 
3376     endian::Writer LE(Out, little);
3377     uint64_t Start = Out.tell();
3378     assert((Start >> 32) == 0 && "Selector key offset too large");
3379     Writer.SetSelectorOffset(Sel, Start);
3380     unsigned N = Sel.getNumArgs();
3381     LE.write<uint16_t>(N);
3382     if (N == 0)
3383       N = 1;
3384     for (unsigned I = 0; I != N; ++I)
3385       LE.write<uint32_t>(
3386           Writer.getIdentifierRef(Sel.getIdentifierInfoForSlot(I)));
3387   }
3388 
3389   void EmitData(raw_ostream& Out, key_type_ref,
3390                 data_type_ref Methods, unsigned DataLen) {
3391     using namespace llvm::support;
3392 
3393     endian::Writer LE(Out, little);
3394     uint64_t Start = Out.tell(); (void)Start;
3395     LE.write<uint32_t>(Methods.ID);
3396     unsigned NumInstanceMethods = 0;
3397     for (const ObjCMethodList *Method = &Methods.Instance; Method;
3398          Method = Method->getNext())
3399       if (Method->getMethod())
3400         ++NumInstanceMethods;
3401 
3402     unsigned NumFactoryMethods = 0;
3403     for (const ObjCMethodList *Method = &Methods.Factory; Method;
3404          Method = Method->getNext())
3405       if (Method->getMethod())
3406         ++NumFactoryMethods;
3407 
3408     unsigned InstanceBits = Methods.Instance.getBits();
3409     assert(InstanceBits < 4);
3410     unsigned InstanceHasMoreThanOneDeclBit =
3411         Methods.Instance.hasMoreThanOneDecl();
3412     unsigned FullInstanceBits = (NumInstanceMethods << 3) |
3413                                 (InstanceHasMoreThanOneDeclBit << 2) |
3414                                 InstanceBits;
3415     unsigned FactoryBits = Methods.Factory.getBits();
3416     assert(FactoryBits < 4);
3417     unsigned FactoryHasMoreThanOneDeclBit =
3418         Methods.Factory.hasMoreThanOneDecl();
3419     unsigned FullFactoryBits = (NumFactoryMethods << 3) |
3420                                (FactoryHasMoreThanOneDeclBit << 2) |
3421                                FactoryBits;
3422     LE.write<uint16_t>(FullInstanceBits);
3423     LE.write<uint16_t>(FullFactoryBits);
3424     for (const ObjCMethodList *Method = &Methods.Instance; Method;
3425          Method = Method->getNext())
3426       if (Method->getMethod())
3427         LE.write<uint32_t>(Writer.getDeclID(Method->getMethod()));
3428     for (const ObjCMethodList *Method = &Methods.Factory; Method;
3429          Method = Method->getNext())
3430       if (Method->getMethod())
3431         LE.write<uint32_t>(Writer.getDeclID(Method->getMethod()));
3432 
3433     assert(Out.tell() - Start == DataLen && "Data length is wrong");
3434   }
3435 };
3436 
3437 } // namespace
3438 
3439 /// Write ObjC data: selectors and the method pool.
3440 ///
3441 /// The method pool contains both instance and factory methods, stored
3442 /// in an on-disk hash table indexed by the selector. The hash table also
3443 /// contains an empty entry for every other selector known to Sema.
3444 void ASTWriter::WriteSelectors(Sema &SemaRef) {
3445   using namespace llvm;
3446 
3447   // Do we have to do anything at all?
3448   if (SemaRef.MethodPool.empty() && SelectorIDs.empty())
3449     return;
3450   unsigned NumTableEntries = 0;
3451   // Create and write out the blob that contains selectors and the method pool.
3452   {
3453     llvm::OnDiskChainedHashTableGenerator<ASTMethodPoolTrait> Generator;
3454     ASTMethodPoolTrait Trait(*this);
3455 
3456     // Create the on-disk hash table representation. We walk through every
3457     // selector we've seen and look it up in the method pool.
3458     SelectorOffsets.resize(NextSelectorID - FirstSelectorID);
3459     for (auto &SelectorAndID : SelectorIDs) {
3460       Selector S = SelectorAndID.first;
3461       SelectorID ID = SelectorAndID.second;
3462       Sema::GlobalMethodPool::iterator F = SemaRef.MethodPool.find(S);
3463       ASTMethodPoolTrait::data_type Data = {
3464         ID,
3465         ObjCMethodList(),
3466         ObjCMethodList()
3467       };
3468       if (F != SemaRef.MethodPool.end()) {
3469         Data.Instance = F->second.first;
3470         Data.Factory = F->second.second;
3471       }
3472       // Only write this selector if it's not in an existing AST or something
3473       // changed.
3474       if (Chain && ID < FirstSelectorID) {
3475         // Selector already exists. Did it change?
3476         bool changed = false;
3477         for (ObjCMethodList *M = &Data.Instance;
3478              !changed && M && M->getMethod(); M = M->getNext()) {
3479           if (!M->getMethod()->isFromASTFile())
3480             changed = true;
3481         }
3482         for (ObjCMethodList *M = &Data.Factory; !changed && M && M->getMethod();
3483              M = M->getNext()) {
3484           if (!M->getMethod()->isFromASTFile())
3485             changed = true;
3486         }
3487         if (!changed)
3488           continue;
3489       } else if (Data.Instance.getMethod() || Data.Factory.getMethod()) {
3490         // A new method pool entry.
3491         ++NumTableEntries;
3492       }
3493       Generator.insert(S, Data, Trait);
3494     }
3495 
3496     // Create the on-disk hash table in a buffer.
3497     SmallString<4096> MethodPool;
3498     uint32_t BucketOffset;
3499     {
3500       using namespace llvm::support;
3501 
3502       ASTMethodPoolTrait Trait(*this);
3503       llvm::raw_svector_ostream Out(MethodPool);
3504       // Make sure that no bucket is at offset 0
3505       endian::write<uint32_t>(Out, 0, little);
3506       BucketOffset = Generator.Emit(Out, Trait);
3507     }
3508 
3509     // Create a blob abbreviation
3510     auto Abbrev = std::make_shared<BitCodeAbbrev>();
3511     Abbrev->Add(BitCodeAbbrevOp(METHOD_POOL));
3512     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3513     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3514     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
3515     unsigned MethodPoolAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
3516 
3517     // Write the method pool
3518     {
3519       RecordData::value_type Record[] = {METHOD_POOL, BucketOffset,
3520                                          NumTableEntries};
3521       Stream.EmitRecordWithBlob(MethodPoolAbbrev, Record, MethodPool);
3522     }
3523 
3524     // Create a blob abbreviation for the selector table offsets.
3525     Abbrev = std::make_shared<BitCodeAbbrev>();
3526     Abbrev->Add(BitCodeAbbrevOp(SELECTOR_OFFSETS));
3527     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // size
3528     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // first ID
3529     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
3530     unsigned SelectorOffsetAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
3531 
3532     // Write the selector offsets table.
3533     {
3534       RecordData::value_type Record[] = {
3535           SELECTOR_OFFSETS, SelectorOffsets.size(),
3536           FirstSelectorID - NUM_PREDEF_SELECTOR_IDS};
3537       Stream.EmitRecordWithBlob(SelectorOffsetAbbrev, Record,
3538                                 bytes(SelectorOffsets));
3539     }
3540   }
3541 }
3542 
3543 /// Write the selectors referenced in @selector expression into AST file.
3544 void ASTWriter::WriteReferencedSelectorsPool(Sema &SemaRef) {
3545   using namespace llvm;
3546 
3547   if (SemaRef.ReferencedSelectors.empty())
3548     return;
3549 
3550   RecordData Record;
3551   ASTRecordWriter Writer(*this, Record);
3552 
3553   // Note: this writes out all references even for a dependent AST. But it is
3554   // very tricky to fix, and given that @selector shouldn't really appear in
3555   // headers, probably not worth it. It's not a correctness issue.
3556   for (auto &SelectorAndLocation : SemaRef.ReferencedSelectors) {
3557     Selector Sel = SelectorAndLocation.first;
3558     SourceLocation Loc = SelectorAndLocation.second;
3559     Writer.AddSelectorRef(Sel);
3560     Writer.AddSourceLocation(Loc);
3561   }
3562   Writer.Emit(REFERENCED_SELECTOR_POOL);
3563 }
3564 
3565 //===----------------------------------------------------------------------===//
3566 // Identifier Table Serialization
3567 //===----------------------------------------------------------------------===//
3568 
3569 /// Determine the declaration that should be put into the name lookup table to
3570 /// represent the given declaration in this module. This is usually D itself,
3571 /// but if D was imported and merged into a local declaration, we want the most
3572 /// recent local declaration instead. The chosen declaration will be the most
3573 /// recent declaration in any module that imports this one.
3574 static NamedDecl *getDeclForLocalLookup(const LangOptions &LangOpts,
3575                                         NamedDecl *D) {
3576   if (!LangOpts.Modules || !D->isFromASTFile())
3577     return D;
3578 
3579   if (Decl *Redecl = D->getPreviousDecl()) {
3580     // For Redeclarable decls, a prior declaration might be local.
3581     for (; Redecl; Redecl = Redecl->getPreviousDecl()) {
3582       // If we find a local decl, we're done.
3583       if (!Redecl->isFromASTFile()) {
3584         // Exception: in very rare cases (for injected-class-names), not all
3585         // redeclarations are in the same semantic context. Skip ones in a
3586         // different context. They don't go in this lookup table at all.
3587         if (!Redecl->getDeclContext()->getRedeclContext()->Equals(
3588                 D->getDeclContext()->getRedeclContext()))
3589           continue;
3590         return cast<NamedDecl>(Redecl);
3591       }
3592 
3593       // If we find a decl from a (chained-)PCH stop since we won't find a
3594       // local one.
3595       if (Redecl->getOwningModuleID() == 0)
3596         break;
3597     }
3598   } else if (Decl *First = D->getCanonicalDecl()) {
3599     // For Mergeable decls, the first decl might be local.
3600     if (!First->isFromASTFile())
3601       return cast<NamedDecl>(First);
3602   }
3603 
3604   // All declarations are imported. Our most recent declaration will also be
3605   // the most recent one in anyone who imports us.
3606   return D;
3607 }
3608 
3609 namespace {
3610 
3611 class ASTIdentifierTableTrait {
3612   ASTWriter &Writer;
3613   Preprocessor &PP;
3614   IdentifierResolver &IdResolver;
3615   bool IsModule;
3616   bool NeedDecls;
3617   ASTWriter::RecordData *InterestingIdentifierOffsets;
3618 
3619   /// Determines whether this is an "interesting" identifier that needs a
3620   /// full IdentifierInfo structure written into the hash table. Notably, this
3621   /// doesn't check whether the name has macros defined; use PublicMacroIterator
3622   /// to check that.
3623   bool isInterestingIdentifier(const IdentifierInfo *II, uint64_t MacroOffset) {
3624     if (MacroOffset ||
3625         II->isPoisoned() ||
3626         (IsModule ? II->hasRevertedBuiltin() : II->getObjCOrBuiltinID()) ||
3627         II->hasRevertedTokenIDToIdentifier() ||
3628         (NeedDecls && II->getFETokenInfo()))
3629       return true;
3630 
3631     return false;
3632   }
3633 
3634 public:
3635   using key_type = IdentifierInfo *;
3636   using key_type_ref = key_type;
3637 
3638   using data_type = IdentID;
3639   using data_type_ref = data_type;
3640 
3641   using hash_value_type = unsigned;
3642   using offset_type = unsigned;
3643 
3644   ASTIdentifierTableTrait(ASTWriter &Writer, Preprocessor &PP,
3645                           IdentifierResolver &IdResolver, bool IsModule,
3646                           ASTWriter::RecordData *InterestingIdentifierOffsets)
3647       : Writer(Writer), PP(PP), IdResolver(IdResolver), IsModule(IsModule),
3648         NeedDecls(!IsModule || !Writer.getLangOpts().CPlusPlus),
3649         InterestingIdentifierOffsets(InterestingIdentifierOffsets) {}
3650 
3651   bool needDecls() const { return NeedDecls; }
3652 
3653   static hash_value_type ComputeHash(const IdentifierInfo* II) {
3654     return llvm::djbHash(II->getName());
3655   }
3656 
3657   bool isInterestingIdentifier(const IdentifierInfo *II) {
3658     auto MacroOffset = Writer.getMacroDirectivesOffset(II);
3659     return isInterestingIdentifier(II, MacroOffset);
3660   }
3661 
3662   bool isInterestingNonMacroIdentifier(const IdentifierInfo *II) {
3663     return isInterestingIdentifier(II, 0);
3664   }
3665 
3666   std::pair<unsigned, unsigned>
3667   EmitKeyDataLength(raw_ostream& Out, IdentifierInfo* II, IdentID ID) {
3668     unsigned KeyLen = II->getLength() + 1;
3669     unsigned DataLen = 4; // 4 bytes for the persistent ID << 1
3670     auto MacroOffset = Writer.getMacroDirectivesOffset(II);
3671     if (isInterestingIdentifier(II, MacroOffset)) {
3672       DataLen += 2; // 2 bytes for builtin ID
3673       DataLen += 2; // 2 bytes for flags
3674       if (MacroOffset)
3675         DataLen += 4; // MacroDirectives offset.
3676 
3677       if (NeedDecls) {
3678         for (IdentifierResolver::iterator D = IdResolver.begin(II),
3679                                        DEnd = IdResolver.end();
3680              D != DEnd; ++D)
3681           DataLen += 4;
3682       }
3683     }
3684 
3685     using namespace llvm::support;
3686 
3687     endian::Writer LE(Out, little);
3688 
3689     assert((uint16_t)DataLen == DataLen && (uint16_t)KeyLen == KeyLen);
3690     LE.write<uint16_t>(DataLen);
3691     // We emit the key length after the data length so that every
3692     // string is preceded by a 16-bit length. This matches the PTH
3693     // format for storing identifiers.
3694     LE.write<uint16_t>(KeyLen);
3695     return std::make_pair(KeyLen, DataLen);
3696   }
3697 
3698   void EmitKey(raw_ostream& Out, const IdentifierInfo* II,
3699                unsigned KeyLen) {
3700     // Record the location of the key data.  This is used when generating
3701     // the mapping from persistent IDs to strings.
3702     Writer.SetIdentifierOffset(II, Out.tell());
3703 
3704     // Emit the offset of the key/data length information to the interesting
3705     // identifiers table if necessary.
3706     if (InterestingIdentifierOffsets && isInterestingIdentifier(II))
3707       InterestingIdentifierOffsets->push_back(Out.tell() - 4);
3708 
3709     Out.write(II->getNameStart(), KeyLen);
3710   }
3711 
3712   void EmitData(raw_ostream& Out, IdentifierInfo* II,
3713                 IdentID ID, unsigned) {
3714     using namespace llvm::support;
3715 
3716     endian::Writer LE(Out, little);
3717 
3718     auto MacroOffset = Writer.getMacroDirectivesOffset(II);
3719     if (!isInterestingIdentifier(II, MacroOffset)) {
3720       LE.write<uint32_t>(ID << 1);
3721       return;
3722     }
3723 
3724     LE.write<uint32_t>((ID << 1) | 0x01);
3725     uint32_t Bits = (uint32_t)II->getObjCOrBuiltinID();
3726     assert((Bits & 0xffff) == Bits && "ObjCOrBuiltinID too big for ASTReader.");
3727     LE.write<uint16_t>(Bits);
3728     Bits = 0;
3729     bool HadMacroDefinition = MacroOffset != 0;
3730     Bits = (Bits << 1) | unsigned(HadMacroDefinition);
3731     Bits = (Bits << 1) | unsigned(II->isExtensionToken());
3732     Bits = (Bits << 1) | unsigned(II->isPoisoned());
3733     Bits = (Bits << 1) | unsigned(II->hasRevertedBuiltin());
3734     Bits = (Bits << 1) | unsigned(II->hasRevertedTokenIDToIdentifier());
3735     Bits = (Bits << 1) | unsigned(II->isCPlusPlusOperatorKeyword());
3736     LE.write<uint16_t>(Bits);
3737 
3738     if (HadMacroDefinition)
3739       LE.write<uint32_t>(MacroOffset);
3740 
3741     if (NeedDecls) {
3742       // Emit the declaration IDs in reverse order, because the
3743       // IdentifierResolver provides the declarations as they would be
3744       // visible (e.g., the function "stat" would come before the struct
3745       // "stat"), but the ASTReader adds declarations to the end of the list
3746       // (so we need to see the struct "stat" before the function "stat").
3747       // Only emit declarations that aren't from a chained PCH, though.
3748       SmallVector<NamedDecl *, 16> Decls(IdResolver.begin(II),
3749                                          IdResolver.end());
3750       for (SmallVectorImpl<NamedDecl *>::reverse_iterator D = Decls.rbegin(),
3751                                                           DEnd = Decls.rend();
3752            D != DEnd; ++D)
3753         LE.write<uint32_t>(
3754             Writer.getDeclID(getDeclForLocalLookup(PP.getLangOpts(), *D)));
3755     }
3756   }
3757 };
3758 
3759 } // namespace
3760 
3761 /// Write the identifier table into the AST file.
3762 ///
3763 /// The identifier table consists of a blob containing string data
3764 /// (the actual identifiers themselves) and a separate "offsets" index
3765 /// that maps identifier IDs to locations within the blob.
3766 void ASTWriter::WriteIdentifierTable(Preprocessor &PP,
3767                                      IdentifierResolver &IdResolver,
3768                                      bool IsModule) {
3769   using namespace llvm;
3770 
3771   RecordData InterestingIdents;
3772 
3773   // Create and write out the blob that contains the identifier
3774   // strings.
3775   {
3776     llvm::OnDiskChainedHashTableGenerator<ASTIdentifierTableTrait> Generator;
3777     ASTIdentifierTableTrait Trait(
3778         *this, PP, IdResolver, IsModule,
3779         (getLangOpts().CPlusPlus && IsModule) ? &InterestingIdents : nullptr);
3780 
3781     // Look for any identifiers that were named while processing the
3782     // headers, but are otherwise not needed. We add these to the hash
3783     // table to enable checking of the predefines buffer in the case
3784     // where the user adds new macro definitions when building the AST
3785     // file.
3786     SmallVector<const IdentifierInfo *, 128> IIs;
3787     for (const auto &ID : PP.getIdentifierTable())
3788       IIs.push_back(ID.second);
3789     // Sort the identifiers lexicographically before getting them references so
3790     // that their order is stable.
3791     llvm::sort(IIs, llvm::deref<std::less<>>());
3792     for (const IdentifierInfo *II : IIs)
3793       if (Trait.isInterestingNonMacroIdentifier(II))
3794         getIdentifierRef(II);
3795 
3796     // Create the on-disk hash table representation. We only store offsets
3797     // for identifiers that appear here for the first time.
3798     IdentifierOffsets.resize(NextIdentID - FirstIdentID);
3799     for (auto IdentIDPair : IdentifierIDs) {
3800       auto *II = const_cast<IdentifierInfo *>(IdentIDPair.first);
3801       IdentID ID = IdentIDPair.second;
3802       assert(II && "NULL identifier in identifier table");
3803       // Write out identifiers if either the ID is local or the identifier has
3804       // changed since it was loaded.
3805       if (ID >= FirstIdentID || !Chain || !II->isFromAST()
3806           || II->hasChangedSinceDeserialization() ||
3807           (Trait.needDecls() &&
3808            II->hasFETokenInfoChangedSinceDeserialization()))
3809         Generator.insert(II, ID, Trait);
3810     }
3811 
3812     // Create the on-disk hash table in a buffer.
3813     SmallString<4096> IdentifierTable;
3814     uint32_t BucketOffset;
3815     {
3816       using namespace llvm::support;
3817 
3818       llvm::raw_svector_ostream Out(IdentifierTable);
3819       // Make sure that no bucket is at offset 0
3820       endian::write<uint32_t>(Out, 0, little);
3821       BucketOffset = Generator.Emit(Out, Trait);
3822     }
3823 
3824     // Create a blob abbreviation
3825     auto Abbrev = std::make_shared<BitCodeAbbrev>();
3826     Abbrev->Add(BitCodeAbbrevOp(IDENTIFIER_TABLE));
3827     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3828     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
3829     unsigned IDTableAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
3830 
3831     // Write the identifier table
3832     RecordData::value_type Record[] = {IDENTIFIER_TABLE, BucketOffset};
3833     Stream.EmitRecordWithBlob(IDTableAbbrev, Record, IdentifierTable);
3834   }
3835 
3836   // Write the offsets table for identifier IDs.
3837   auto Abbrev = std::make_shared<BitCodeAbbrev>();
3838   Abbrev->Add(BitCodeAbbrevOp(IDENTIFIER_OFFSET));
3839   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // # of identifiers
3840   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // first ID
3841   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
3842   unsigned IdentifierOffsetAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
3843 
3844 #ifndef NDEBUG
3845   for (unsigned I = 0, N = IdentifierOffsets.size(); I != N; ++I)
3846     assert(IdentifierOffsets[I] && "Missing identifier offset?");
3847 #endif
3848 
3849   RecordData::value_type Record[] = {IDENTIFIER_OFFSET,
3850                                      IdentifierOffsets.size(),
3851                                      FirstIdentID - NUM_PREDEF_IDENT_IDS};
3852   Stream.EmitRecordWithBlob(IdentifierOffsetAbbrev, Record,
3853                             bytes(IdentifierOffsets));
3854 
3855   // In C++, write the list of interesting identifiers (those that are
3856   // defined as macros, poisoned, or similar unusual things).
3857   if (!InterestingIdents.empty())
3858     Stream.EmitRecord(INTERESTING_IDENTIFIERS, InterestingIdents);
3859 }
3860 
3861 //===----------------------------------------------------------------------===//
3862 // DeclContext's Name Lookup Table Serialization
3863 //===----------------------------------------------------------------------===//
3864 
3865 namespace {
3866 
3867 // Trait used for the on-disk hash table used in the method pool.
3868 class ASTDeclContextNameLookupTrait {
3869   ASTWriter &Writer;
3870   llvm::SmallVector<DeclID, 64> DeclIDs;
3871 
3872 public:
3873   using key_type = DeclarationNameKey;
3874   using key_type_ref = key_type;
3875 
3876   /// A start and end index into DeclIDs, representing a sequence of decls.
3877   using data_type = std::pair<unsigned, unsigned>;
3878   using data_type_ref = const data_type &;
3879 
3880   using hash_value_type = unsigned;
3881   using offset_type = unsigned;
3882 
3883   explicit ASTDeclContextNameLookupTrait(ASTWriter &Writer) : Writer(Writer) {}
3884 
3885   template<typename Coll>
3886   data_type getData(const Coll &Decls) {
3887     unsigned Start = DeclIDs.size();
3888     for (NamedDecl *D : Decls) {
3889       DeclIDs.push_back(
3890           Writer.GetDeclRef(getDeclForLocalLookup(Writer.getLangOpts(), D)));
3891     }
3892     return std::make_pair(Start, DeclIDs.size());
3893   }
3894 
3895   data_type ImportData(const reader::ASTDeclContextNameLookupTrait::data_type &FromReader) {
3896     unsigned Start = DeclIDs.size();
3897     for (auto ID : FromReader)
3898       DeclIDs.push_back(ID);
3899     return std::make_pair(Start, DeclIDs.size());
3900   }
3901 
3902   static bool EqualKey(key_type_ref a, key_type_ref b) {
3903     return a == b;
3904   }
3905 
3906   hash_value_type ComputeHash(DeclarationNameKey Name) {
3907     return Name.getHash();
3908   }
3909 
3910   void EmitFileRef(raw_ostream &Out, ModuleFile *F) const {
3911     assert(Writer.hasChain() &&
3912            "have reference to loaded module file but no chain?");
3913 
3914     using namespace llvm::support;
3915 
3916     endian::write<uint32_t>(Out, Writer.getChain()->getModuleFileID(F), little);
3917   }
3918 
3919   std::pair<unsigned, unsigned> EmitKeyDataLength(raw_ostream &Out,
3920                                                   DeclarationNameKey Name,
3921                                                   data_type_ref Lookup) {
3922     using namespace llvm::support;
3923 
3924     endian::Writer LE(Out, little);
3925     unsigned KeyLen = 1;
3926     switch (Name.getKind()) {
3927     case DeclarationName::Identifier:
3928     case DeclarationName::ObjCZeroArgSelector:
3929     case DeclarationName::ObjCOneArgSelector:
3930     case DeclarationName::ObjCMultiArgSelector:
3931     case DeclarationName::CXXLiteralOperatorName:
3932     case DeclarationName::CXXDeductionGuideName:
3933       KeyLen += 4;
3934       break;
3935     case DeclarationName::CXXOperatorName:
3936       KeyLen += 1;
3937       break;
3938     case DeclarationName::CXXConstructorName:
3939     case DeclarationName::CXXDestructorName:
3940     case DeclarationName::CXXConversionFunctionName:
3941     case DeclarationName::CXXUsingDirective:
3942       break;
3943     }
3944     LE.write<uint16_t>(KeyLen);
3945 
3946     // 4 bytes for each DeclID.
3947     unsigned DataLen = 4 * (Lookup.second - Lookup.first);
3948     assert(uint16_t(DataLen) == DataLen &&
3949            "too many decls for serialized lookup result");
3950     LE.write<uint16_t>(DataLen);
3951 
3952     return std::make_pair(KeyLen, DataLen);
3953   }
3954 
3955   void EmitKey(raw_ostream &Out, DeclarationNameKey Name, unsigned) {
3956     using namespace llvm::support;
3957 
3958     endian::Writer LE(Out, little);
3959     LE.write<uint8_t>(Name.getKind());
3960     switch (Name.getKind()) {
3961     case DeclarationName::Identifier:
3962     case DeclarationName::CXXLiteralOperatorName:
3963     case DeclarationName::CXXDeductionGuideName:
3964       LE.write<uint32_t>(Writer.getIdentifierRef(Name.getIdentifier()));
3965       return;
3966     case DeclarationName::ObjCZeroArgSelector:
3967     case DeclarationName::ObjCOneArgSelector:
3968     case DeclarationName::ObjCMultiArgSelector:
3969       LE.write<uint32_t>(Writer.getSelectorRef(Name.getSelector()));
3970       return;
3971     case DeclarationName::CXXOperatorName:
3972       assert(Name.getOperatorKind() < NUM_OVERLOADED_OPERATORS &&
3973              "Invalid operator?");
3974       LE.write<uint8_t>(Name.getOperatorKind());
3975       return;
3976     case DeclarationName::CXXConstructorName:
3977     case DeclarationName::CXXDestructorName:
3978     case DeclarationName::CXXConversionFunctionName:
3979     case DeclarationName::CXXUsingDirective:
3980       return;
3981     }
3982 
3983     llvm_unreachable("Invalid name kind?");
3984   }
3985 
3986   void EmitData(raw_ostream &Out, key_type_ref, data_type Lookup,
3987                 unsigned DataLen) {
3988     using namespace llvm::support;
3989 
3990     endian::Writer LE(Out, little);
3991     uint64_t Start = Out.tell(); (void)Start;
3992     for (unsigned I = Lookup.first, N = Lookup.second; I != N; ++I)
3993       LE.write<uint32_t>(DeclIDs[I]);
3994     assert(Out.tell() - Start == DataLen && "Data length is wrong");
3995   }
3996 };
3997 
3998 } // namespace
3999 
4000 bool ASTWriter::isLookupResultExternal(StoredDeclsList &Result,
4001                                        DeclContext *DC) {
4002   return Result.hasExternalDecls() &&
4003          DC->hasNeedToReconcileExternalVisibleStorage();
4004 }
4005 
4006 bool ASTWriter::isLookupResultEntirelyExternal(StoredDeclsList &Result,
4007                                                DeclContext *DC) {
4008   for (auto *D : Result.getLookupResult())
4009     if (!getDeclForLocalLookup(getLangOpts(), D)->isFromASTFile())
4010       return false;
4011 
4012   return true;
4013 }
4014 
4015 void
4016 ASTWriter::GenerateNameLookupTable(const DeclContext *ConstDC,
4017                                    llvm::SmallVectorImpl<char> &LookupTable) {
4018   assert(!ConstDC->hasLazyLocalLexicalLookups() &&
4019          !ConstDC->hasLazyExternalLexicalLookups() &&
4020          "must call buildLookups first");
4021 
4022   // FIXME: We need to build the lookups table, which is logically const.
4023   auto *DC = const_cast<DeclContext*>(ConstDC);
4024   assert(DC == DC->getPrimaryContext() && "only primary DC has lookup table");
4025 
4026   // Create the on-disk hash table representation.
4027   MultiOnDiskHashTableGenerator<reader::ASTDeclContextNameLookupTrait,
4028                                 ASTDeclContextNameLookupTrait> Generator;
4029   ASTDeclContextNameLookupTrait Trait(*this);
4030 
4031   // The first step is to collect the declaration names which we need to
4032   // serialize into the name lookup table, and to collect them in a stable
4033   // order.
4034   SmallVector<DeclarationName, 16> Names;
4035 
4036   // We also build up small sets of the constructor and conversion function
4037   // names which are visible.
4038   llvm::SmallSet<DeclarationName, 8> ConstructorNameSet, ConversionNameSet;
4039 
4040   for (auto &Lookup : *DC->buildLookup()) {
4041     auto &Name = Lookup.first;
4042     auto &Result = Lookup.second;
4043 
4044     // If there are no local declarations in our lookup result, we
4045     // don't need to write an entry for the name at all. If we can't
4046     // write out a lookup set without performing more deserialization,
4047     // just skip this entry.
4048     if (isLookupResultExternal(Result, DC) &&
4049         isLookupResultEntirelyExternal(Result, DC))
4050       continue;
4051 
4052     // We also skip empty results. If any of the results could be external and
4053     // the currently available results are empty, then all of the results are
4054     // external and we skip it above. So the only way we get here with an empty
4055     // results is when no results could have been external *and* we have
4056     // external results.
4057     //
4058     // FIXME: While we might want to start emitting on-disk entries for negative
4059     // lookups into a decl context as an optimization, today we *have* to skip
4060     // them because there are names with empty lookup results in decl contexts
4061     // which we can't emit in any stable ordering: we lookup constructors and
4062     // conversion functions in the enclosing namespace scope creating empty
4063     // results for them. This in almost certainly a bug in Clang's name lookup,
4064     // but that is likely to be hard or impossible to fix and so we tolerate it
4065     // here by omitting lookups with empty results.
4066     if (Lookup.second.getLookupResult().empty())
4067       continue;
4068 
4069     switch (Lookup.first.getNameKind()) {
4070     default:
4071       Names.push_back(Lookup.first);
4072       break;
4073 
4074     case DeclarationName::CXXConstructorName:
4075       assert(isa<CXXRecordDecl>(DC) &&
4076              "Cannot have a constructor name outside of a class!");
4077       ConstructorNameSet.insert(Name);
4078       break;
4079 
4080     case DeclarationName::CXXConversionFunctionName:
4081       assert(isa<CXXRecordDecl>(DC) &&
4082              "Cannot have a conversion function name outside of a class!");
4083       ConversionNameSet.insert(Name);
4084       break;
4085     }
4086   }
4087 
4088   // Sort the names into a stable order.
4089   llvm::sort(Names);
4090 
4091   if (auto *D = dyn_cast<CXXRecordDecl>(DC)) {
4092     // We need to establish an ordering of constructor and conversion function
4093     // names, and they don't have an intrinsic ordering.
4094 
4095     // First we try the easy case by forming the current context's constructor
4096     // name and adding that name first. This is a very useful optimization to
4097     // avoid walking the lexical declarations in many cases, and it also
4098     // handles the only case where a constructor name can come from some other
4099     // lexical context -- when that name is an implicit constructor merged from
4100     // another declaration in the redecl chain. Any non-implicit constructor or
4101     // conversion function which doesn't occur in all the lexical contexts
4102     // would be an ODR violation.
4103     auto ImplicitCtorName = Context->DeclarationNames.getCXXConstructorName(
4104         Context->getCanonicalType(Context->getRecordType(D)));
4105     if (ConstructorNameSet.erase(ImplicitCtorName))
4106       Names.push_back(ImplicitCtorName);
4107 
4108     // If we still have constructors or conversion functions, we walk all the
4109     // names in the decl and add the constructors and conversion functions
4110     // which are visible in the order they lexically occur within the context.
4111     if (!ConstructorNameSet.empty() || !ConversionNameSet.empty())
4112       for (Decl *ChildD : cast<CXXRecordDecl>(DC)->decls())
4113         if (auto *ChildND = dyn_cast<NamedDecl>(ChildD)) {
4114           auto Name = ChildND->getDeclName();
4115           switch (Name.getNameKind()) {
4116           default:
4117             continue;
4118 
4119           case DeclarationName::CXXConstructorName:
4120             if (ConstructorNameSet.erase(Name))
4121               Names.push_back(Name);
4122             break;
4123 
4124           case DeclarationName::CXXConversionFunctionName:
4125             if (ConversionNameSet.erase(Name))
4126               Names.push_back(Name);
4127             break;
4128           }
4129 
4130           if (ConstructorNameSet.empty() && ConversionNameSet.empty())
4131             break;
4132         }
4133 
4134     assert(ConstructorNameSet.empty() && "Failed to find all of the visible "
4135                                          "constructors by walking all the "
4136                                          "lexical members of the context.");
4137     assert(ConversionNameSet.empty() && "Failed to find all of the visible "
4138                                         "conversion functions by walking all "
4139                                         "the lexical members of the context.");
4140   }
4141 
4142   // Next we need to do a lookup with each name into this decl context to fully
4143   // populate any results from external sources. We don't actually use the
4144   // results of these lookups because we only want to use the results after all
4145   // results have been loaded and the pointers into them will be stable.
4146   for (auto &Name : Names)
4147     DC->lookup(Name);
4148 
4149   // Now we need to insert the results for each name into the hash table. For
4150   // constructor names and conversion function names, we actually need to merge
4151   // all of the results for them into one list of results each and insert
4152   // those.
4153   SmallVector<NamedDecl *, 8> ConstructorDecls;
4154   SmallVector<NamedDecl *, 8> ConversionDecls;
4155 
4156   // Now loop over the names, either inserting them or appending for the two
4157   // special cases.
4158   for (auto &Name : Names) {
4159     DeclContext::lookup_result Result = DC->noload_lookup(Name);
4160 
4161     switch (Name.getNameKind()) {
4162     default:
4163       Generator.insert(Name, Trait.getData(Result), Trait);
4164       break;
4165 
4166     case DeclarationName::CXXConstructorName:
4167       ConstructorDecls.append(Result.begin(), Result.end());
4168       break;
4169 
4170     case DeclarationName::CXXConversionFunctionName:
4171       ConversionDecls.append(Result.begin(), Result.end());
4172       break;
4173     }
4174   }
4175 
4176   // Handle our two special cases if we ended up having any. We arbitrarily use
4177   // the first declaration's name here because the name itself isn't part of
4178   // the key, only the kind of name is used.
4179   if (!ConstructorDecls.empty())
4180     Generator.insert(ConstructorDecls.front()->getDeclName(),
4181                      Trait.getData(ConstructorDecls), Trait);
4182   if (!ConversionDecls.empty())
4183     Generator.insert(ConversionDecls.front()->getDeclName(),
4184                      Trait.getData(ConversionDecls), Trait);
4185 
4186   // Create the on-disk hash table. Also emit the existing imported and
4187   // merged table if there is one.
4188   auto *Lookups = Chain ? Chain->getLoadedLookupTables(DC) : nullptr;
4189   Generator.emit(LookupTable, Trait, Lookups ? &Lookups->Table : nullptr);
4190 }
4191 
4192 /// Write the block containing all of the declaration IDs
4193 /// visible from the given DeclContext.
4194 ///
4195 /// \returns the offset of the DECL_CONTEXT_VISIBLE block within the
4196 /// bitstream, or 0 if no block was written.
4197 uint64_t ASTWriter::WriteDeclContextVisibleBlock(ASTContext &Context,
4198                                                  DeclContext *DC) {
4199   // If we imported a key declaration of this namespace, write the visible
4200   // lookup results as an update record for it rather than including them
4201   // on this declaration. We will only look at key declarations on reload.
4202   if (isa<NamespaceDecl>(DC) && Chain &&
4203       Chain->getKeyDeclaration(cast<Decl>(DC))->isFromASTFile()) {
4204     // Only do this once, for the first local declaration of the namespace.
4205     for (auto *Prev = cast<NamespaceDecl>(DC)->getPreviousDecl(); Prev;
4206          Prev = Prev->getPreviousDecl())
4207       if (!Prev->isFromASTFile())
4208         return 0;
4209 
4210     // Note that we need to emit an update record for the primary context.
4211     UpdatedDeclContexts.insert(DC->getPrimaryContext());
4212 
4213     // Make sure all visible decls are written. They will be recorded later. We
4214     // do this using a side data structure so we can sort the names into
4215     // a deterministic order.
4216     StoredDeclsMap *Map = DC->getPrimaryContext()->buildLookup();
4217     SmallVector<std::pair<DeclarationName, DeclContext::lookup_result>, 16>
4218         LookupResults;
4219     if (Map) {
4220       LookupResults.reserve(Map->size());
4221       for (auto &Entry : *Map)
4222         LookupResults.push_back(
4223             std::make_pair(Entry.first, Entry.second.getLookupResult()));
4224     }
4225 
4226     llvm::sort(LookupResults, llvm::less_first());
4227     for (auto &NameAndResult : LookupResults) {
4228       DeclarationName Name = NameAndResult.first;
4229       DeclContext::lookup_result Result = NameAndResult.second;
4230       if (Name.getNameKind() == DeclarationName::CXXConstructorName ||
4231           Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
4232         // We have to work around a name lookup bug here where negative lookup
4233         // results for these names get cached in namespace lookup tables (these
4234         // names should never be looked up in a namespace).
4235         assert(Result.empty() && "Cannot have a constructor or conversion "
4236                                  "function name in a namespace!");
4237         continue;
4238       }
4239 
4240       for (NamedDecl *ND : Result)
4241         if (!ND->isFromASTFile())
4242           GetDeclRef(ND);
4243     }
4244 
4245     return 0;
4246   }
4247 
4248   if (DC->getPrimaryContext() != DC)
4249     return 0;
4250 
4251   // Skip contexts which don't support name lookup.
4252   if (!DC->isLookupContext())
4253     return 0;
4254 
4255   // If not in C++, we perform name lookup for the translation unit via the
4256   // IdentifierInfo chains, don't bother to build a visible-declarations table.
4257   if (DC->isTranslationUnit() && !Context.getLangOpts().CPlusPlus)
4258     return 0;
4259 
4260   // Serialize the contents of the mapping used for lookup. Note that,
4261   // although we have two very different code paths, the serialized
4262   // representation is the same for both cases: a declaration name,
4263   // followed by a size, followed by references to the visible
4264   // declarations that have that name.
4265   uint64_t Offset = Stream.GetCurrentBitNo();
4266   StoredDeclsMap *Map = DC->buildLookup();
4267   if (!Map || Map->empty())
4268     return 0;
4269 
4270   // Create the on-disk hash table in a buffer.
4271   SmallString<4096> LookupTable;
4272   GenerateNameLookupTable(DC, LookupTable);
4273 
4274   // Write the lookup table
4275   RecordData::value_type Record[] = {DECL_CONTEXT_VISIBLE};
4276   Stream.EmitRecordWithBlob(DeclContextVisibleLookupAbbrev, Record,
4277                             LookupTable);
4278   ++NumVisibleDeclContexts;
4279   return Offset;
4280 }
4281 
4282 /// Write an UPDATE_VISIBLE block for the given context.
4283 ///
4284 /// UPDATE_VISIBLE blocks contain the declarations that are added to an existing
4285 /// DeclContext in a dependent AST file. As such, they only exist for the TU
4286 /// (in C++), for namespaces, and for classes with forward-declared unscoped
4287 /// enumeration members (in C++11).
4288 void ASTWriter::WriteDeclContextVisibleUpdate(const DeclContext *DC) {
4289   StoredDeclsMap *Map = DC->getLookupPtr();
4290   if (!Map || Map->empty())
4291     return;
4292 
4293   // Create the on-disk hash table in a buffer.
4294   SmallString<4096> LookupTable;
4295   GenerateNameLookupTable(DC, LookupTable);
4296 
4297   // If we're updating a namespace, select a key declaration as the key for the
4298   // update record; those are the only ones that will be checked on reload.
4299   if (isa<NamespaceDecl>(DC))
4300     DC = cast<DeclContext>(Chain->getKeyDeclaration(cast<Decl>(DC)));
4301 
4302   // Write the lookup table
4303   RecordData::value_type Record[] = {UPDATE_VISIBLE, getDeclID(cast<Decl>(DC))};
4304   Stream.EmitRecordWithBlob(UpdateVisibleAbbrev, Record, LookupTable);
4305 }
4306 
4307 /// Write an FP_PRAGMA_OPTIONS block for the given FPOptions.
4308 void ASTWriter::WriteFPPragmaOptions(const FPOptions &Opts) {
4309   RecordData::value_type Record[] = {Opts.getInt()};
4310   Stream.EmitRecord(FP_PRAGMA_OPTIONS, Record);
4311 }
4312 
4313 /// Write an OPENCL_EXTENSIONS block for the given OpenCLOptions.
4314 void ASTWriter::WriteOpenCLExtensions(Sema &SemaRef) {
4315   if (!SemaRef.Context.getLangOpts().OpenCL)
4316     return;
4317 
4318   const OpenCLOptions &Opts = SemaRef.getOpenCLOptions();
4319   RecordData Record;
4320   for (const auto &I:Opts.OptMap) {
4321     AddString(I.getKey(), Record);
4322     auto V = I.getValue();
4323     Record.push_back(V.Supported ? 1 : 0);
4324     Record.push_back(V.Enabled ? 1 : 0);
4325     Record.push_back(V.Avail);
4326     Record.push_back(V.Core);
4327   }
4328   Stream.EmitRecord(OPENCL_EXTENSIONS, Record);
4329 }
4330 
4331 void ASTWriter::WriteOpenCLExtensionTypes(Sema &SemaRef) {
4332   if (!SemaRef.Context.getLangOpts().OpenCL)
4333     return;
4334 
4335   // Sort the elements of the map OpenCLTypeExtMap by TypeIDs,
4336   // without copying them.
4337   const llvm::DenseMap<const Type *, std::set<std::string>> &OpenCLTypeExtMap =
4338       SemaRef.OpenCLTypeExtMap;
4339   using ElementTy = std::pair<TypeID, const std::set<std::string> *>;
4340   llvm::SmallVector<ElementTy, 8> StableOpenCLTypeExtMap;
4341   StableOpenCLTypeExtMap.reserve(OpenCLTypeExtMap.size());
4342 
4343   for (const auto &I : OpenCLTypeExtMap)
4344     StableOpenCLTypeExtMap.emplace_back(
4345         getTypeID(I.first->getCanonicalTypeInternal()), &I.second);
4346 
4347   auto CompareByTypeID = [](const ElementTy &E1, const ElementTy &E2) -> bool {
4348     return E1.first < E2.first;
4349   };
4350   llvm::sort(StableOpenCLTypeExtMap, CompareByTypeID);
4351 
4352   RecordData Record;
4353   for (const ElementTy &E : StableOpenCLTypeExtMap) {
4354     Record.push_back(E.first); // TypeID
4355     const std::set<std::string> *ExtSet = E.second;
4356     Record.push_back(static_cast<unsigned>(ExtSet->size()));
4357     for (const std::string &Ext : *ExtSet)
4358       AddString(Ext, Record);
4359   }
4360 
4361   Stream.EmitRecord(OPENCL_EXTENSION_TYPES, Record);
4362 }
4363 
4364 void ASTWriter::WriteOpenCLExtensionDecls(Sema &SemaRef) {
4365   if (!SemaRef.Context.getLangOpts().OpenCL)
4366     return;
4367 
4368   // Sort the elements of the map OpenCLDeclExtMap by DeclIDs,
4369   // without copying them.
4370   const llvm::DenseMap<const Decl *, std::set<std::string>> &OpenCLDeclExtMap =
4371       SemaRef.OpenCLDeclExtMap;
4372   using ElementTy = std::pair<DeclID, const std::set<std::string> *>;
4373   llvm::SmallVector<ElementTy, 8> StableOpenCLDeclExtMap;
4374   StableOpenCLDeclExtMap.reserve(OpenCLDeclExtMap.size());
4375 
4376   for (const auto &I : OpenCLDeclExtMap)
4377     StableOpenCLDeclExtMap.emplace_back(getDeclID(I.first), &I.second);
4378 
4379   auto CompareByDeclID = [](const ElementTy &E1, const ElementTy &E2) -> bool {
4380     return E1.first < E2.first;
4381   };
4382   llvm::sort(StableOpenCLDeclExtMap, CompareByDeclID);
4383 
4384   RecordData Record;
4385   for (const ElementTy &E : StableOpenCLDeclExtMap) {
4386     Record.push_back(E.first); // DeclID
4387     const std::set<std::string> *ExtSet = E.second;
4388     Record.push_back(static_cast<unsigned>(ExtSet->size()));
4389     for (const std::string &Ext : *ExtSet)
4390       AddString(Ext, Record);
4391   }
4392 
4393   Stream.EmitRecord(OPENCL_EXTENSION_DECLS, Record);
4394 }
4395 
4396 void ASTWriter::WriteCUDAPragmas(Sema &SemaRef) {
4397   if (SemaRef.ForceCUDAHostDeviceDepth > 0) {
4398     RecordData::value_type Record[] = {SemaRef.ForceCUDAHostDeviceDepth};
4399     Stream.EmitRecord(CUDA_PRAGMA_FORCE_HOST_DEVICE_DEPTH, Record);
4400   }
4401 }
4402 
4403 void ASTWriter::WriteObjCCategories() {
4404   SmallVector<ObjCCategoriesInfo, 2> CategoriesMap;
4405   RecordData Categories;
4406 
4407   for (unsigned I = 0, N = ObjCClassesWithCategories.size(); I != N; ++I) {
4408     unsigned Size = 0;
4409     unsigned StartIndex = Categories.size();
4410 
4411     ObjCInterfaceDecl *Class = ObjCClassesWithCategories[I];
4412 
4413     // Allocate space for the size.
4414     Categories.push_back(0);
4415 
4416     // Add the categories.
4417     for (ObjCInterfaceDecl::known_categories_iterator
4418            Cat = Class->known_categories_begin(),
4419            CatEnd = Class->known_categories_end();
4420          Cat != CatEnd; ++Cat, ++Size) {
4421       assert(getDeclID(*Cat) != 0 && "Bogus category");
4422       AddDeclRef(*Cat, Categories);
4423     }
4424 
4425     // Update the size.
4426     Categories[StartIndex] = Size;
4427 
4428     // Record this interface -> category map.
4429     ObjCCategoriesInfo CatInfo = { getDeclID(Class), StartIndex };
4430     CategoriesMap.push_back(CatInfo);
4431   }
4432 
4433   // Sort the categories map by the definition ID, since the reader will be
4434   // performing binary searches on this information.
4435   llvm::array_pod_sort(CategoriesMap.begin(), CategoriesMap.end());
4436 
4437   // Emit the categories map.
4438   using namespace llvm;
4439 
4440   auto Abbrev = std::make_shared<BitCodeAbbrev>();
4441   Abbrev->Add(BitCodeAbbrevOp(OBJC_CATEGORIES_MAP));
4442   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // # of entries
4443   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
4444   unsigned AbbrevID = Stream.EmitAbbrev(std::move(Abbrev));
4445 
4446   RecordData::value_type Record[] = {OBJC_CATEGORIES_MAP, CategoriesMap.size()};
4447   Stream.EmitRecordWithBlob(AbbrevID, Record,
4448                             reinterpret_cast<char *>(CategoriesMap.data()),
4449                             CategoriesMap.size() * sizeof(ObjCCategoriesInfo));
4450 
4451   // Emit the category lists.
4452   Stream.EmitRecord(OBJC_CATEGORIES, Categories);
4453 }
4454 
4455 void ASTWriter::WriteLateParsedTemplates(Sema &SemaRef) {
4456   Sema::LateParsedTemplateMapT &LPTMap = SemaRef.LateParsedTemplateMap;
4457 
4458   if (LPTMap.empty())
4459     return;
4460 
4461   RecordData Record;
4462   for (auto &LPTMapEntry : LPTMap) {
4463     const FunctionDecl *FD = LPTMapEntry.first;
4464     LateParsedTemplate &LPT = *LPTMapEntry.second;
4465     AddDeclRef(FD, Record);
4466     AddDeclRef(LPT.D, Record);
4467     Record.push_back(LPT.Toks.size());
4468 
4469     for (const auto &Tok : LPT.Toks) {
4470       AddToken(Tok, Record);
4471     }
4472   }
4473   Stream.EmitRecord(LATE_PARSED_TEMPLATE, Record);
4474 }
4475 
4476 /// Write the state of 'pragma clang optimize' at the end of the module.
4477 void ASTWriter::WriteOptimizePragmaOptions(Sema &SemaRef) {
4478   RecordData Record;
4479   SourceLocation PragmaLoc = SemaRef.getOptimizeOffPragmaLocation();
4480   AddSourceLocation(PragmaLoc, Record);
4481   Stream.EmitRecord(OPTIMIZE_PRAGMA_OPTIONS, Record);
4482 }
4483 
4484 /// Write the state of 'pragma ms_struct' at the end of the module.
4485 void ASTWriter::WriteMSStructPragmaOptions(Sema &SemaRef) {
4486   RecordData Record;
4487   Record.push_back(SemaRef.MSStructPragmaOn ? PMSST_ON : PMSST_OFF);
4488   Stream.EmitRecord(MSSTRUCT_PRAGMA_OPTIONS, Record);
4489 }
4490 
4491 /// Write the state of 'pragma pointers_to_members' at the end of the
4492 //module.
4493 void ASTWriter::WriteMSPointersToMembersPragmaOptions(Sema &SemaRef) {
4494   RecordData Record;
4495   Record.push_back(SemaRef.MSPointerToMemberRepresentationMethod);
4496   AddSourceLocation(SemaRef.ImplicitMSInheritanceAttrLoc, Record);
4497   Stream.EmitRecord(POINTERS_TO_MEMBERS_PRAGMA_OPTIONS, Record);
4498 }
4499 
4500 /// Write the state of 'pragma pack' at the end of the module.
4501 void ASTWriter::WritePackPragmaOptions(Sema &SemaRef) {
4502   // Don't serialize pragma pack state for modules, since it should only take
4503   // effect on a per-submodule basis.
4504   if (WritingModule)
4505     return;
4506 
4507   RecordData Record;
4508   Record.push_back(SemaRef.PackStack.CurrentValue);
4509   AddSourceLocation(SemaRef.PackStack.CurrentPragmaLocation, Record);
4510   Record.push_back(SemaRef.PackStack.Stack.size());
4511   for (const auto &StackEntry : SemaRef.PackStack.Stack) {
4512     Record.push_back(StackEntry.Value);
4513     AddSourceLocation(StackEntry.PragmaLocation, Record);
4514     AddSourceLocation(StackEntry.PragmaPushLocation, Record);
4515     AddString(StackEntry.StackSlotLabel, Record);
4516   }
4517   Stream.EmitRecord(PACK_PRAGMA_OPTIONS, Record);
4518 }
4519 
4520 void ASTWriter::WriteModuleFileExtension(Sema &SemaRef,
4521                                          ModuleFileExtensionWriter &Writer) {
4522   // Enter the extension block.
4523   Stream.EnterSubblock(EXTENSION_BLOCK_ID, 4);
4524 
4525   // Emit the metadata record abbreviation.
4526   auto Abv = std::make_shared<llvm::BitCodeAbbrev>();
4527   Abv->Add(llvm::BitCodeAbbrevOp(EXTENSION_METADATA));
4528   Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
4529   Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
4530   Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
4531   Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
4532   Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::Blob));
4533   unsigned Abbrev = Stream.EmitAbbrev(std::move(Abv));
4534 
4535   // Emit the metadata record.
4536   RecordData Record;
4537   auto Metadata = Writer.getExtension()->getExtensionMetadata();
4538   Record.push_back(EXTENSION_METADATA);
4539   Record.push_back(Metadata.MajorVersion);
4540   Record.push_back(Metadata.MinorVersion);
4541   Record.push_back(Metadata.BlockName.size());
4542   Record.push_back(Metadata.UserInfo.size());
4543   SmallString<64> Buffer;
4544   Buffer += Metadata.BlockName;
4545   Buffer += Metadata.UserInfo;
4546   Stream.EmitRecordWithBlob(Abbrev, Record, Buffer);
4547 
4548   // Emit the contents of the extension block.
4549   Writer.writeExtensionContents(SemaRef, Stream);
4550 
4551   // Exit the extension block.
4552   Stream.ExitBlock();
4553 }
4554 
4555 //===----------------------------------------------------------------------===//
4556 // General Serialization Routines
4557 //===----------------------------------------------------------------------===//
4558 
4559 void ASTRecordWriter::AddAttr(const Attr *A) {
4560   auto &Record = *this;
4561   if (!A)
4562     return Record.push_back(0);
4563   Record.push_back(A->getKind() + 1); // FIXME: stable encoding, target attrs
4564 
4565   Record.AddIdentifierRef(A->getAttrName());
4566   Record.AddIdentifierRef(A->getScopeName());
4567   Record.AddSourceRange(A->getRange());
4568   Record.AddSourceLocation(A->getScopeLoc());
4569   Record.push_back(A->getParsedKind());
4570   Record.push_back(A->getSyntax());
4571   Record.push_back(A->getAttributeSpellingListIndexRaw());
4572 
4573 #include "clang/Serialization/AttrPCHWrite.inc"
4574 }
4575 
4576 /// Emit the list of attributes to the specified record.
4577 void ASTRecordWriter::AddAttributes(ArrayRef<const Attr *> Attrs) {
4578   push_back(Attrs.size());
4579   for (const auto *A : Attrs)
4580     AddAttr(A);
4581 }
4582 
4583 void ASTWriter::AddToken(const Token &Tok, RecordDataImpl &Record) {
4584   AddSourceLocation(Tok.getLocation(), Record);
4585   Record.push_back(Tok.getLength());
4586 
4587   // FIXME: When reading literal tokens, reconstruct the literal pointer
4588   // if it is needed.
4589   AddIdentifierRef(Tok.getIdentifierInfo(), Record);
4590   // FIXME: Should translate token kind to a stable encoding.
4591   Record.push_back(Tok.getKind());
4592   // FIXME: Should translate token flags to a stable encoding.
4593   Record.push_back(Tok.getFlags());
4594 }
4595 
4596 void ASTWriter::AddString(StringRef Str, RecordDataImpl &Record) {
4597   Record.push_back(Str.size());
4598   Record.insert(Record.end(), Str.begin(), Str.end());
4599 }
4600 
4601 bool ASTWriter::PreparePathForOutput(SmallVectorImpl<char> &Path) {
4602   assert(Context && "should have context when outputting path");
4603 
4604   bool Changed =
4605       cleanPathForOutput(Context->getSourceManager().getFileManager(), Path);
4606 
4607   // Remove a prefix to make the path relative, if relevant.
4608   const char *PathBegin = Path.data();
4609   const char *PathPtr =
4610       adjustFilenameForRelocatableAST(PathBegin, BaseDirectory);
4611   if (PathPtr != PathBegin) {
4612     Path.erase(Path.begin(), Path.begin() + (PathPtr - PathBegin));
4613     Changed = true;
4614   }
4615 
4616   return Changed;
4617 }
4618 
4619 void ASTWriter::AddPath(StringRef Path, RecordDataImpl &Record) {
4620   SmallString<128> FilePath(Path);
4621   PreparePathForOutput(FilePath);
4622   AddString(FilePath, Record);
4623 }
4624 
4625 void ASTWriter::EmitRecordWithPath(unsigned Abbrev, RecordDataRef Record,
4626                                    StringRef Path) {
4627   SmallString<128> FilePath(Path);
4628   PreparePathForOutput(FilePath);
4629   Stream.EmitRecordWithBlob(Abbrev, Record, FilePath);
4630 }
4631 
4632 void ASTWriter::AddVersionTuple(const VersionTuple &Version,
4633                                 RecordDataImpl &Record) {
4634   Record.push_back(Version.getMajor());
4635   if (Optional<unsigned> Minor = Version.getMinor())
4636     Record.push_back(*Minor + 1);
4637   else
4638     Record.push_back(0);
4639   if (Optional<unsigned> Subminor = Version.getSubminor())
4640     Record.push_back(*Subminor + 1);
4641   else
4642     Record.push_back(0);
4643 }
4644 
4645 /// Note that the identifier II occurs at the given offset
4646 /// within the identifier table.
4647 void ASTWriter::SetIdentifierOffset(const IdentifierInfo *II, uint32_t Offset) {
4648   IdentID ID = IdentifierIDs[II];
4649   // Only store offsets new to this AST file. Other identifier names are looked
4650   // up earlier in the chain and thus don't need an offset.
4651   if (ID >= FirstIdentID)
4652     IdentifierOffsets[ID - FirstIdentID] = Offset;
4653 }
4654 
4655 /// Note that the selector Sel occurs at the given offset
4656 /// within the method pool/selector table.
4657 void ASTWriter::SetSelectorOffset(Selector Sel, uint32_t Offset) {
4658   unsigned ID = SelectorIDs[Sel];
4659   assert(ID && "Unknown selector");
4660   // Don't record offsets for selectors that are also available in a different
4661   // file.
4662   if (ID < FirstSelectorID)
4663     return;
4664   SelectorOffsets[ID - FirstSelectorID] = Offset;
4665 }
4666 
4667 ASTWriter::ASTWriter(llvm::BitstreamWriter &Stream,
4668                      SmallVectorImpl<char> &Buffer,
4669                      InMemoryModuleCache &ModuleCache,
4670                      ArrayRef<std::shared_ptr<ModuleFileExtension>> Extensions,
4671                      bool IncludeTimestamps)
4672     : Stream(Stream), Buffer(Buffer), ModuleCache(ModuleCache),
4673       IncludeTimestamps(IncludeTimestamps) {
4674   for (const auto &Ext : Extensions) {
4675     if (auto Writer = Ext->createExtensionWriter(*this))
4676       ModuleFileExtensionWriters.push_back(std::move(Writer));
4677   }
4678 }
4679 
4680 ASTWriter::~ASTWriter() {
4681   llvm::DeleteContainerSeconds(FileDeclIDs);
4682 }
4683 
4684 const LangOptions &ASTWriter::getLangOpts() const {
4685   assert(WritingAST && "can't determine lang opts when not writing AST");
4686   return Context->getLangOpts();
4687 }
4688 
4689 time_t ASTWriter::getTimestampForOutput(const FileEntry *E) const {
4690   return IncludeTimestamps ? E->getModificationTime() : 0;
4691 }
4692 
4693 ASTFileSignature ASTWriter::WriteAST(Sema &SemaRef,
4694                                      const std::string &OutputFile,
4695                                      Module *WritingModule, StringRef isysroot,
4696                                      bool hasErrors,
4697                                      bool ShouldCacheASTInMemory) {
4698   WritingAST = true;
4699 
4700   ASTHasCompilerErrors = hasErrors;
4701 
4702   // Emit the file header.
4703   Stream.Emit((unsigned)'C', 8);
4704   Stream.Emit((unsigned)'P', 8);
4705   Stream.Emit((unsigned)'C', 8);
4706   Stream.Emit((unsigned)'H', 8);
4707 
4708   WriteBlockInfoBlock();
4709 
4710   Context = &SemaRef.Context;
4711   PP = &SemaRef.PP;
4712   this->WritingModule = WritingModule;
4713   ASTFileSignature Signature =
4714       WriteASTCore(SemaRef, isysroot, OutputFile, WritingModule);
4715   Context = nullptr;
4716   PP = nullptr;
4717   this->WritingModule = nullptr;
4718   this->BaseDirectory.clear();
4719 
4720   WritingAST = false;
4721   if (ShouldCacheASTInMemory) {
4722     // Construct MemoryBuffer and update buffer manager.
4723     ModuleCache.addBuiltPCM(OutputFile,
4724                             llvm::MemoryBuffer::getMemBufferCopy(
4725                                 StringRef(Buffer.begin(), Buffer.size())));
4726   }
4727   return Signature;
4728 }
4729 
4730 template<typename Vector>
4731 static void AddLazyVectorDecls(ASTWriter &Writer, Vector &Vec,
4732                                ASTWriter::RecordData &Record) {
4733   for (typename Vector::iterator I = Vec.begin(nullptr, true), E = Vec.end();
4734        I != E; ++I) {
4735     Writer.AddDeclRef(*I, Record);
4736   }
4737 }
4738 
4739 ASTFileSignature ASTWriter::WriteASTCore(Sema &SemaRef, StringRef isysroot,
4740                                          const std::string &OutputFile,
4741                                          Module *WritingModule) {
4742   using namespace llvm;
4743 
4744   bool isModule = WritingModule != nullptr;
4745 
4746   // Make sure that the AST reader knows to finalize itself.
4747   if (Chain)
4748     Chain->finalizeForWriting();
4749 
4750   ASTContext &Context = SemaRef.Context;
4751   Preprocessor &PP = SemaRef.PP;
4752 
4753   // Set up predefined declaration IDs.
4754   auto RegisterPredefDecl = [&] (Decl *D, PredefinedDeclIDs ID) {
4755     if (D) {
4756       assert(D->isCanonicalDecl() && "predefined decl is not canonical");
4757       DeclIDs[D] = ID;
4758     }
4759   };
4760   RegisterPredefDecl(Context.getTranslationUnitDecl(),
4761                      PREDEF_DECL_TRANSLATION_UNIT_ID);
4762   RegisterPredefDecl(Context.ObjCIdDecl, PREDEF_DECL_OBJC_ID_ID);
4763   RegisterPredefDecl(Context.ObjCSelDecl, PREDEF_DECL_OBJC_SEL_ID);
4764   RegisterPredefDecl(Context.ObjCClassDecl, PREDEF_DECL_OBJC_CLASS_ID);
4765   RegisterPredefDecl(Context.ObjCProtocolClassDecl,
4766                      PREDEF_DECL_OBJC_PROTOCOL_ID);
4767   RegisterPredefDecl(Context.Int128Decl, PREDEF_DECL_INT_128_ID);
4768   RegisterPredefDecl(Context.UInt128Decl, PREDEF_DECL_UNSIGNED_INT_128_ID);
4769   RegisterPredefDecl(Context.ObjCInstanceTypeDecl,
4770                      PREDEF_DECL_OBJC_INSTANCETYPE_ID);
4771   RegisterPredefDecl(Context.BuiltinVaListDecl, PREDEF_DECL_BUILTIN_VA_LIST_ID);
4772   RegisterPredefDecl(Context.VaListTagDecl, PREDEF_DECL_VA_LIST_TAG);
4773   RegisterPredefDecl(Context.BuiltinMSVaListDecl,
4774                      PREDEF_DECL_BUILTIN_MS_VA_LIST_ID);
4775   RegisterPredefDecl(Context.ExternCContext, PREDEF_DECL_EXTERN_C_CONTEXT_ID);
4776   RegisterPredefDecl(Context.MakeIntegerSeqDecl,
4777                      PREDEF_DECL_MAKE_INTEGER_SEQ_ID);
4778   RegisterPredefDecl(Context.CFConstantStringTypeDecl,
4779                      PREDEF_DECL_CF_CONSTANT_STRING_ID);
4780   RegisterPredefDecl(Context.CFConstantStringTagDecl,
4781                      PREDEF_DECL_CF_CONSTANT_STRING_TAG_ID);
4782   RegisterPredefDecl(Context.TypePackElementDecl,
4783                      PREDEF_DECL_TYPE_PACK_ELEMENT_ID);
4784 
4785   // Build a record containing all of the tentative definitions in this file, in
4786   // TentativeDefinitions order.  Generally, this record will be empty for
4787   // headers.
4788   RecordData TentativeDefinitions;
4789   AddLazyVectorDecls(*this, SemaRef.TentativeDefinitions, TentativeDefinitions);
4790 
4791   // Build a record containing all of the file scoped decls in this file.
4792   RecordData UnusedFileScopedDecls;
4793   if (!isModule)
4794     AddLazyVectorDecls(*this, SemaRef.UnusedFileScopedDecls,
4795                        UnusedFileScopedDecls);
4796 
4797   // Build a record containing all of the delegating constructors we still need
4798   // to resolve.
4799   RecordData DelegatingCtorDecls;
4800   if (!isModule)
4801     AddLazyVectorDecls(*this, SemaRef.DelegatingCtorDecls, DelegatingCtorDecls);
4802 
4803   // Write the set of weak, undeclared identifiers. We always write the
4804   // entire table, since later PCH files in a PCH chain are only interested in
4805   // the results at the end of the chain.
4806   RecordData WeakUndeclaredIdentifiers;
4807   for (auto &WeakUndeclaredIdentifier : SemaRef.WeakUndeclaredIdentifiers) {
4808     IdentifierInfo *II = WeakUndeclaredIdentifier.first;
4809     WeakInfo &WI = WeakUndeclaredIdentifier.second;
4810     AddIdentifierRef(II, WeakUndeclaredIdentifiers);
4811     AddIdentifierRef(WI.getAlias(), WeakUndeclaredIdentifiers);
4812     AddSourceLocation(WI.getLocation(), WeakUndeclaredIdentifiers);
4813     WeakUndeclaredIdentifiers.push_back(WI.getUsed());
4814   }
4815 
4816   // Build a record containing all of the ext_vector declarations.
4817   RecordData ExtVectorDecls;
4818   AddLazyVectorDecls(*this, SemaRef.ExtVectorDecls, ExtVectorDecls);
4819 
4820   // Build a record containing all of the VTable uses information.
4821   RecordData VTableUses;
4822   if (!SemaRef.VTableUses.empty()) {
4823     for (unsigned I = 0, N = SemaRef.VTableUses.size(); I != N; ++I) {
4824       AddDeclRef(SemaRef.VTableUses[I].first, VTableUses);
4825       AddSourceLocation(SemaRef.VTableUses[I].second, VTableUses);
4826       VTableUses.push_back(SemaRef.VTablesUsed[SemaRef.VTableUses[I].first]);
4827     }
4828   }
4829 
4830   // Build a record containing all of the UnusedLocalTypedefNameCandidates.
4831   RecordData UnusedLocalTypedefNameCandidates;
4832   for (const TypedefNameDecl *TD : SemaRef.UnusedLocalTypedefNameCandidates)
4833     AddDeclRef(TD, UnusedLocalTypedefNameCandidates);
4834 
4835   // Build a record containing all of pending implicit instantiations.
4836   RecordData PendingInstantiations;
4837   for (const auto &I : SemaRef.PendingInstantiations) {
4838     AddDeclRef(I.first, PendingInstantiations);
4839     AddSourceLocation(I.second, PendingInstantiations);
4840   }
4841   assert(SemaRef.PendingLocalImplicitInstantiations.empty() &&
4842          "There are local ones at end of translation unit!");
4843 
4844   // Build a record containing some declaration references.
4845   RecordData SemaDeclRefs;
4846   if (SemaRef.StdNamespace || SemaRef.StdBadAlloc || SemaRef.StdAlignValT) {
4847     AddDeclRef(SemaRef.getStdNamespace(), SemaDeclRefs);
4848     AddDeclRef(SemaRef.getStdBadAlloc(), SemaDeclRefs);
4849     AddDeclRef(SemaRef.getStdAlignValT(), SemaDeclRefs);
4850   }
4851 
4852   RecordData CUDASpecialDeclRefs;
4853   if (Context.getcudaConfigureCallDecl()) {
4854     AddDeclRef(Context.getcudaConfigureCallDecl(), CUDASpecialDeclRefs);
4855   }
4856 
4857   // Build a record containing all of the known namespaces.
4858   RecordData KnownNamespaces;
4859   for (const auto &I : SemaRef.KnownNamespaces) {
4860     if (!I.second)
4861       AddDeclRef(I.first, KnownNamespaces);
4862   }
4863 
4864   // Build a record of all used, undefined objects that require definitions.
4865   RecordData UndefinedButUsed;
4866 
4867   SmallVector<std::pair<NamedDecl *, SourceLocation>, 16> Undefined;
4868   SemaRef.getUndefinedButUsed(Undefined);
4869   for (const auto &I : Undefined) {
4870     AddDeclRef(I.first, UndefinedButUsed);
4871     AddSourceLocation(I.second, UndefinedButUsed);
4872   }
4873 
4874   // Build a record containing all delete-expressions that we would like to
4875   // analyze later in AST.
4876   RecordData DeleteExprsToAnalyze;
4877 
4878   if (!isModule) {
4879     for (const auto &DeleteExprsInfo :
4880          SemaRef.getMismatchingDeleteExpressions()) {
4881       AddDeclRef(DeleteExprsInfo.first, DeleteExprsToAnalyze);
4882       DeleteExprsToAnalyze.push_back(DeleteExprsInfo.second.size());
4883       for (const auto &DeleteLoc : DeleteExprsInfo.second) {
4884         AddSourceLocation(DeleteLoc.first, DeleteExprsToAnalyze);
4885         DeleteExprsToAnalyze.push_back(DeleteLoc.second);
4886       }
4887     }
4888   }
4889 
4890   // Write the control block
4891   WriteControlBlock(PP, Context, isysroot, OutputFile);
4892 
4893   // Write the remaining AST contents.
4894   Stream.EnterSubblock(AST_BLOCK_ID, 5);
4895 
4896   // This is so that older clang versions, before the introduction
4897   // of the control block, can read and reject the newer PCH format.
4898   {
4899     RecordData Record = {VERSION_MAJOR};
4900     Stream.EmitRecord(METADATA_OLD_FORMAT, Record);
4901   }
4902 
4903   // Create a lexical update block containing all of the declarations in the
4904   // translation unit that do not come from other AST files.
4905   const TranslationUnitDecl *TU = Context.getTranslationUnitDecl();
4906   SmallVector<uint32_t, 128> NewGlobalKindDeclPairs;
4907   for (const auto *D : TU->noload_decls()) {
4908     if (!D->isFromASTFile()) {
4909       NewGlobalKindDeclPairs.push_back(D->getKind());
4910       NewGlobalKindDeclPairs.push_back(GetDeclRef(D));
4911     }
4912   }
4913 
4914   auto Abv = std::make_shared<BitCodeAbbrev>();
4915   Abv->Add(llvm::BitCodeAbbrevOp(TU_UPDATE_LEXICAL));
4916   Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::Blob));
4917   unsigned TuUpdateLexicalAbbrev = Stream.EmitAbbrev(std::move(Abv));
4918   {
4919     RecordData::value_type Record[] = {TU_UPDATE_LEXICAL};
4920     Stream.EmitRecordWithBlob(TuUpdateLexicalAbbrev, Record,
4921                               bytes(NewGlobalKindDeclPairs));
4922   }
4923 
4924   // And a visible updates block for the translation unit.
4925   Abv = std::make_shared<BitCodeAbbrev>();
4926   Abv->Add(llvm::BitCodeAbbrevOp(UPDATE_VISIBLE));
4927   Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
4928   Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::Blob));
4929   UpdateVisibleAbbrev = Stream.EmitAbbrev(std::move(Abv));
4930   WriteDeclContextVisibleUpdate(TU);
4931 
4932   // If we have any extern "C" names, write out a visible update for them.
4933   if (Context.ExternCContext)
4934     WriteDeclContextVisibleUpdate(Context.ExternCContext);
4935 
4936   // If the translation unit has an anonymous namespace, and we don't already
4937   // have an update block for it, write it as an update block.
4938   // FIXME: Why do we not do this if there's already an update block?
4939   if (NamespaceDecl *NS = TU->getAnonymousNamespace()) {
4940     ASTWriter::UpdateRecord &Record = DeclUpdates[TU];
4941     if (Record.empty())
4942       Record.push_back(DeclUpdate(UPD_CXX_ADDED_ANONYMOUS_NAMESPACE, NS));
4943   }
4944 
4945   // Add update records for all mangling numbers and static local numbers.
4946   // These aren't really update records, but this is a convenient way of
4947   // tagging this rare extra data onto the declarations.
4948   for (const auto &Number : Context.MangleNumbers)
4949     if (!Number.first->isFromASTFile())
4950       DeclUpdates[Number.first].push_back(DeclUpdate(UPD_MANGLING_NUMBER,
4951                                                      Number.second));
4952   for (const auto &Number : Context.StaticLocalNumbers)
4953     if (!Number.first->isFromASTFile())
4954       DeclUpdates[Number.first].push_back(DeclUpdate(UPD_STATIC_LOCAL_NUMBER,
4955                                                      Number.second));
4956 
4957   // Make sure visible decls, added to DeclContexts previously loaded from
4958   // an AST file, are registered for serialization. Likewise for template
4959   // specializations added to imported templates.
4960   for (const auto *I : DeclsToEmitEvenIfUnreferenced) {
4961     GetDeclRef(I);
4962   }
4963 
4964   // Make sure all decls associated with an identifier are registered for
4965   // serialization, if we're storing decls with identifiers.
4966   if (!WritingModule || !getLangOpts().CPlusPlus) {
4967     llvm::SmallVector<const IdentifierInfo*, 256> IIs;
4968     for (const auto &ID : PP.getIdentifierTable()) {
4969       const IdentifierInfo *II = ID.second;
4970       if (!Chain || !II->isFromAST() || II->hasChangedSinceDeserialization())
4971         IIs.push_back(II);
4972     }
4973     // Sort the identifiers to visit based on their name.
4974     llvm::sort(IIs, llvm::deref<std::less<>>());
4975     for (const IdentifierInfo *II : IIs) {
4976       for (IdentifierResolver::iterator D = SemaRef.IdResolver.begin(II),
4977                                      DEnd = SemaRef.IdResolver.end();
4978            D != DEnd; ++D) {
4979         GetDeclRef(*D);
4980       }
4981     }
4982   }
4983 
4984   // For method pool in the module, if it contains an entry for a selector,
4985   // the entry should be complete, containing everything introduced by that
4986   // module and all modules it imports. It's possible that the entry is out of
4987   // date, so we need to pull in the new content here.
4988 
4989   // It's possible that updateOutOfDateSelector can update SelectorIDs. To be
4990   // safe, we copy all selectors out.
4991   llvm::SmallVector<Selector, 256> AllSelectors;
4992   for (auto &SelectorAndID : SelectorIDs)
4993     AllSelectors.push_back(SelectorAndID.first);
4994   for (auto &Selector : AllSelectors)
4995     SemaRef.updateOutOfDateSelector(Selector);
4996 
4997   // Form the record of special types.
4998   RecordData SpecialTypes;
4999   AddTypeRef(Context.getRawCFConstantStringType(), SpecialTypes);
5000   AddTypeRef(Context.getFILEType(), SpecialTypes);
5001   AddTypeRef(Context.getjmp_bufType(), SpecialTypes);
5002   AddTypeRef(Context.getsigjmp_bufType(), SpecialTypes);
5003   AddTypeRef(Context.ObjCIdRedefinitionType, SpecialTypes);
5004   AddTypeRef(Context.ObjCClassRedefinitionType, SpecialTypes);
5005   AddTypeRef(Context.ObjCSelRedefinitionType, SpecialTypes);
5006   AddTypeRef(Context.getucontext_tType(), SpecialTypes);
5007 
5008   if (Chain) {
5009     // Write the mapping information describing our module dependencies and how
5010     // each of those modules were mapped into our own offset/ID space, so that
5011     // the reader can build the appropriate mapping to its own offset/ID space.
5012     // The map consists solely of a blob with the following format:
5013     // *(module-kind:i8
5014     //   module-name-len:i16 module-name:len*i8
5015     //   source-location-offset:i32
5016     //   identifier-id:i32
5017     //   preprocessed-entity-id:i32
5018     //   macro-definition-id:i32
5019     //   submodule-id:i32
5020     //   selector-id:i32
5021     //   declaration-id:i32
5022     //   c++-base-specifiers-id:i32
5023     //   type-id:i32)
5024     //
5025     // module-kind is the ModuleKind enum value. If it is MK_PrebuiltModule or
5026     // MK_ExplicitModule, then the module-name is the module name. Otherwise,
5027     // it is the module file name.
5028     auto Abbrev = std::make_shared<BitCodeAbbrev>();
5029     Abbrev->Add(BitCodeAbbrevOp(MODULE_OFFSET_MAP));
5030     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
5031     unsigned ModuleOffsetMapAbbrev = Stream.EmitAbbrev(std::move(Abbrev));
5032     SmallString<2048> Buffer;
5033     {
5034       llvm::raw_svector_ostream Out(Buffer);
5035       for (ModuleFile &M : Chain->ModuleMgr) {
5036         using namespace llvm::support;
5037 
5038         endian::Writer LE(Out, little);
5039         LE.write<uint8_t>(static_cast<uint8_t>(M.Kind));
5040         StringRef Name =
5041           M.Kind == MK_PrebuiltModule || M.Kind == MK_ExplicitModule
5042           ? M.ModuleName
5043           : M.FileName;
5044         LE.write<uint16_t>(Name.size());
5045         Out.write(Name.data(), Name.size());
5046 
5047         // Note: if a base ID was uint max, it would not be possible to load
5048         // another module after it or have more than one entity inside it.
5049         uint32_t None = std::numeric_limits<uint32_t>::max();
5050 
5051         auto writeBaseIDOrNone = [&](uint32_t BaseID, bool ShouldWrite) {
5052           assert(BaseID < std::numeric_limits<uint32_t>::max() && "base id too high");
5053           if (ShouldWrite)
5054             LE.write<uint32_t>(BaseID);
5055           else
5056             LE.write<uint32_t>(None);
5057         };
5058 
5059         // These values should be unique within a chain, since they will be read
5060         // as keys into ContinuousRangeMaps.
5061         writeBaseIDOrNone(M.SLocEntryBaseOffset, M.LocalNumSLocEntries);
5062         writeBaseIDOrNone(M.BaseIdentifierID, M.LocalNumIdentifiers);
5063         writeBaseIDOrNone(M.BaseMacroID, M.LocalNumMacros);
5064         writeBaseIDOrNone(M.BasePreprocessedEntityID,
5065                           M.NumPreprocessedEntities);
5066         writeBaseIDOrNone(M.BaseSubmoduleID, M.LocalNumSubmodules);
5067         writeBaseIDOrNone(M.BaseSelectorID, M.LocalNumSelectors);
5068         writeBaseIDOrNone(M.BaseDeclID, M.LocalNumDecls);
5069         writeBaseIDOrNone(M.BaseTypeIndex, M.LocalNumTypes);
5070       }
5071     }
5072     RecordData::value_type Record[] = {MODULE_OFFSET_MAP};
5073     Stream.EmitRecordWithBlob(ModuleOffsetMapAbbrev, Record,
5074                               Buffer.data(), Buffer.size());
5075   }
5076 
5077   RecordData DeclUpdatesOffsetsRecord;
5078 
5079   // Keep writing types, declarations, and declaration update records
5080   // until we've emitted all of them.
5081   Stream.EnterSubblock(DECLTYPES_BLOCK_ID, /*bits for abbreviations*/5);
5082   WriteTypeAbbrevs();
5083   WriteDeclAbbrevs();
5084   do {
5085     WriteDeclUpdatesBlocks(DeclUpdatesOffsetsRecord);
5086     while (!DeclTypesToEmit.empty()) {
5087       DeclOrType DOT = DeclTypesToEmit.front();
5088       DeclTypesToEmit.pop();
5089       if (DOT.isType())
5090         WriteType(DOT.getType());
5091       else
5092         WriteDecl(Context, DOT.getDecl());
5093     }
5094   } while (!DeclUpdates.empty());
5095   Stream.ExitBlock();
5096 
5097   DoneWritingDeclsAndTypes = true;
5098 
5099   // These things can only be done once we've written out decls and types.
5100   WriteTypeDeclOffsets();
5101   if (!DeclUpdatesOffsetsRecord.empty())
5102     Stream.EmitRecord(DECL_UPDATE_OFFSETS, DeclUpdatesOffsetsRecord);
5103   WriteFileDeclIDsMap();
5104   WriteSourceManagerBlock(Context.getSourceManager(), PP);
5105   WriteComments();
5106   WritePreprocessor(PP, isModule);
5107   WriteHeaderSearch(PP.getHeaderSearchInfo());
5108   WriteSelectors(SemaRef);
5109   WriteReferencedSelectorsPool(SemaRef);
5110   WriteLateParsedTemplates(SemaRef);
5111   WriteIdentifierTable(PP, SemaRef.IdResolver, isModule);
5112   WriteFPPragmaOptions(SemaRef.getFPOptions());
5113   WriteOpenCLExtensions(SemaRef);
5114   WriteOpenCLExtensionTypes(SemaRef);
5115   WriteCUDAPragmas(SemaRef);
5116 
5117   // If we're emitting a module, write out the submodule information.
5118   if (WritingModule)
5119     WriteSubmodules(WritingModule);
5120 
5121   // We need to have information about submodules to correctly deserialize
5122   // decls from OpenCLExtensionDecls block
5123   WriteOpenCLExtensionDecls(SemaRef);
5124 
5125   Stream.EmitRecord(SPECIAL_TYPES, SpecialTypes);
5126 
5127   // Write the record containing external, unnamed definitions.
5128   if (!EagerlyDeserializedDecls.empty())
5129     Stream.EmitRecord(EAGERLY_DESERIALIZED_DECLS, EagerlyDeserializedDecls);
5130 
5131   if (!ModularCodegenDecls.empty())
5132     Stream.EmitRecord(MODULAR_CODEGEN_DECLS, ModularCodegenDecls);
5133 
5134   // Write the record containing tentative definitions.
5135   if (!TentativeDefinitions.empty())
5136     Stream.EmitRecord(TENTATIVE_DEFINITIONS, TentativeDefinitions);
5137 
5138   // Write the record containing unused file scoped decls.
5139   if (!UnusedFileScopedDecls.empty())
5140     Stream.EmitRecord(UNUSED_FILESCOPED_DECLS, UnusedFileScopedDecls);
5141 
5142   // Write the record containing weak undeclared identifiers.
5143   if (!WeakUndeclaredIdentifiers.empty())
5144     Stream.EmitRecord(WEAK_UNDECLARED_IDENTIFIERS,
5145                       WeakUndeclaredIdentifiers);
5146 
5147   // Write the record containing ext_vector type names.
5148   if (!ExtVectorDecls.empty())
5149     Stream.EmitRecord(EXT_VECTOR_DECLS, ExtVectorDecls);
5150 
5151   // Write the record containing VTable uses information.
5152   if (!VTableUses.empty())
5153     Stream.EmitRecord(VTABLE_USES, VTableUses);
5154 
5155   // Write the record containing potentially unused local typedefs.
5156   if (!UnusedLocalTypedefNameCandidates.empty())
5157     Stream.EmitRecord(UNUSED_LOCAL_TYPEDEF_NAME_CANDIDATES,
5158                       UnusedLocalTypedefNameCandidates);
5159 
5160   // Write the record containing pending implicit instantiations.
5161   if (!PendingInstantiations.empty())
5162     Stream.EmitRecord(PENDING_IMPLICIT_INSTANTIATIONS, PendingInstantiations);
5163 
5164   // Write the record containing declaration references of Sema.
5165   if (!SemaDeclRefs.empty())
5166     Stream.EmitRecord(SEMA_DECL_REFS, SemaDeclRefs);
5167 
5168   // Write the record containing CUDA-specific declaration references.
5169   if (!CUDASpecialDeclRefs.empty())
5170     Stream.EmitRecord(CUDA_SPECIAL_DECL_REFS, CUDASpecialDeclRefs);
5171 
5172   // Write the delegating constructors.
5173   if (!DelegatingCtorDecls.empty())
5174     Stream.EmitRecord(DELEGATING_CTORS, DelegatingCtorDecls);
5175 
5176   // Write the known namespaces.
5177   if (!KnownNamespaces.empty())
5178     Stream.EmitRecord(KNOWN_NAMESPACES, KnownNamespaces);
5179 
5180   // Write the undefined internal functions and variables, and inline functions.
5181   if (!UndefinedButUsed.empty())
5182     Stream.EmitRecord(UNDEFINED_BUT_USED, UndefinedButUsed);
5183 
5184   if (!DeleteExprsToAnalyze.empty())
5185     Stream.EmitRecord(DELETE_EXPRS_TO_ANALYZE, DeleteExprsToAnalyze);
5186 
5187   // Write the visible updates to DeclContexts.
5188   for (auto *DC : UpdatedDeclContexts)
5189     WriteDeclContextVisibleUpdate(DC);
5190 
5191   if (!WritingModule) {
5192     // Write the submodules that were imported, if any.
5193     struct ModuleInfo {
5194       uint64_t ID;
5195       Module *M;
5196       ModuleInfo(uint64_t ID, Module *M) : ID(ID), M(M) {}
5197     };
5198     llvm::SmallVector<ModuleInfo, 64> Imports;
5199     for (const auto *I : Context.local_imports()) {
5200       assert(SubmoduleIDs.find(I->getImportedModule()) != SubmoduleIDs.end());
5201       Imports.push_back(ModuleInfo(SubmoduleIDs[I->getImportedModule()],
5202                          I->getImportedModule()));
5203     }
5204 
5205     if (!Imports.empty()) {
5206       auto Cmp = [](const ModuleInfo &A, const ModuleInfo &B) {
5207         return A.ID < B.ID;
5208       };
5209       auto Eq = [](const ModuleInfo &A, const ModuleInfo &B) {
5210         return A.ID == B.ID;
5211       };
5212 
5213       // Sort and deduplicate module IDs.
5214       llvm::sort(Imports, Cmp);
5215       Imports.erase(std::unique(Imports.begin(), Imports.end(), Eq),
5216                     Imports.end());
5217 
5218       RecordData ImportedModules;
5219       for (const auto &Import : Imports) {
5220         ImportedModules.push_back(Import.ID);
5221         // FIXME: If the module has macros imported then later has declarations
5222         // imported, this location won't be the right one as a location for the
5223         // declaration imports.
5224         AddSourceLocation(PP.getModuleImportLoc(Import.M), ImportedModules);
5225       }
5226 
5227       Stream.EmitRecord(IMPORTED_MODULES, ImportedModules);
5228     }
5229   }
5230 
5231   WriteObjCCategories();
5232   if(!WritingModule) {
5233     WriteOptimizePragmaOptions(SemaRef);
5234     WriteMSStructPragmaOptions(SemaRef);
5235     WriteMSPointersToMembersPragmaOptions(SemaRef);
5236   }
5237   WritePackPragmaOptions(SemaRef);
5238 
5239   // Some simple statistics
5240   RecordData::value_type Record[] = {
5241       NumStatements, NumMacros, NumLexicalDeclContexts, NumVisibleDeclContexts};
5242   Stream.EmitRecord(STATISTICS, Record);
5243   Stream.ExitBlock();
5244 
5245   // Write the module file extension blocks.
5246   for (const auto &ExtWriter : ModuleFileExtensionWriters)
5247     WriteModuleFileExtension(SemaRef, *ExtWriter);
5248 
5249   return writeUnhashedControlBlock(PP, Context);
5250 }
5251 
5252 void ASTWriter::WriteDeclUpdatesBlocks(RecordDataImpl &OffsetsRecord) {
5253   if (DeclUpdates.empty())
5254     return;
5255 
5256   DeclUpdateMap LocalUpdates;
5257   LocalUpdates.swap(DeclUpdates);
5258 
5259   for (auto &DeclUpdate : LocalUpdates) {
5260     const Decl *D = DeclUpdate.first;
5261 
5262     bool HasUpdatedBody = false;
5263     RecordData RecordData;
5264     ASTRecordWriter Record(*this, RecordData);
5265     for (auto &Update : DeclUpdate.second) {
5266       DeclUpdateKind Kind = (DeclUpdateKind)Update.getKind();
5267 
5268       // An updated body is emitted last, so that the reader doesn't need
5269       // to skip over the lazy body to reach statements for other records.
5270       if (Kind == UPD_CXX_ADDED_FUNCTION_DEFINITION)
5271         HasUpdatedBody = true;
5272       else
5273         Record.push_back(Kind);
5274 
5275       switch (Kind) {
5276       case UPD_CXX_ADDED_IMPLICIT_MEMBER:
5277       case UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION:
5278       case UPD_CXX_ADDED_ANONYMOUS_NAMESPACE:
5279         assert(Update.getDecl() && "no decl to add?");
5280         Record.push_back(GetDeclRef(Update.getDecl()));
5281         break;
5282 
5283       case UPD_CXX_ADDED_FUNCTION_DEFINITION:
5284         break;
5285 
5286       case UPD_CXX_POINT_OF_INSTANTIATION:
5287         // FIXME: Do we need to also save the template specialization kind here?
5288         Record.AddSourceLocation(Update.getLoc());
5289         break;
5290 
5291       case UPD_CXX_ADDED_VAR_DEFINITION: {
5292         const VarDecl *VD = cast<VarDecl>(D);
5293         Record.push_back(VD->isInline());
5294         Record.push_back(VD->isInlineSpecified());
5295         if (VD->getInit()) {
5296           Record.push_back(!VD->isInitKnownICE() ? 1
5297                                                  : (VD->isInitICE() ? 3 : 2));
5298           Record.AddStmt(const_cast<Expr*>(VD->getInit()));
5299         } else {
5300           Record.push_back(0);
5301         }
5302         break;
5303       }
5304 
5305       case UPD_CXX_INSTANTIATED_DEFAULT_ARGUMENT:
5306         Record.AddStmt(const_cast<Expr *>(
5307             cast<ParmVarDecl>(Update.getDecl())->getDefaultArg()));
5308         break;
5309 
5310       case UPD_CXX_INSTANTIATED_DEFAULT_MEMBER_INITIALIZER:
5311         Record.AddStmt(
5312             cast<FieldDecl>(Update.getDecl())->getInClassInitializer());
5313         break;
5314 
5315       case UPD_CXX_INSTANTIATED_CLASS_DEFINITION: {
5316         auto *RD = cast<CXXRecordDecl>(D);
5317         UpdatedDeclContexts.insert(RD->getPrimaryContext());
5318         Record.push_back(RD->isParamDestroyedInCallee());
5319         Record.push_back(RD->getArgPassingRestrictions());
5320         Record.AddCXXDefinitionData(RD);
5321         Record.AddOffset(WriteDeclContextLexicalBlock(
5322             *Context, const_cast<CXXRecordDecl *>(RD)));
5323 
5324         // This state is sometimes updated by template instantiation, when we
5325         // switch from the specialization referring to the template declaration
5326         // to it referring to the template definition.
5327         if (auto *MSInfo = RD->getMemberSpecializationInfo()) {
5328           Record.push_back(MSInfo->getTemplateSpecializationKind());
5329           Record.AddSourceLocation(MSInfo->getPointOfInstantiation());
5330         } else {
5331           auto *Spec = cast<ClassTemplateSpecializationDecl>(RD);
5332           Record.push_back(Spec->getTemplateSpecializationKind());
5333           Record.AddSourceLocation(Spec->getPointOfInstantiation());
5334 
5335           // The instantiation might have been resolved to a partial
5336           // specialization. If so, record which one.
5337           auto From = Spec->getInstantiatedFrom();
5338           if (auto PartialSpec =
5339                 From.dyn_cast<ClassTemplatePartialSpecializationDecl*>()) {
5340             Record.push_back(true);
5341             Record.AddDeclRef(PartialSpec);
5342             Record.AddTemplateArgumentList(
5343                 &Spec->getTemplateInstantiationArgs());
5344           } else {
5345             Record.push_back(false);
5346           }
5347         }
5348         Record.push_back(RD->getTagKind());
5349         Record.AddSourceLocation(RD->getLocation());
5350         Record.AddSourceLocation(RD->getBeginLoc());
5351         Record.AddSourceRange(RD->getBraceRange());
5352 
5353         // Instantiation may change attributes; write them all out afresh.
5354         Record.push_back(D->hasAttrs());
5355         if (D->hasAttrs())
5356           Record.AddAttributes(D->getAttrs());
5357 
5358         // FIXME: Ensure we don't get here for explicit instantiations.
5359         break;
5360       }
5361 
5362       case UPD_CXX_RESOLVED_DTOR_DELETE:
5363         Record.AddDeclRef(Update.getDecl());
5364         Record.AddStmt(cast<CXXDestructorDecl>(D)->getOperatorDeleteThisArg());
5365         break;
5366 
5367       case UPD_CXX_RESOLVED_EXCEPTION_SPEC:
5368         addExceptionSpec(
5369             cast<FunctionDecl>(D)->getType()->castAs<FunctionProtoType>(),
5370             Record);
5371         break;
5372 
5373       case UPD_CXX_DEDUCED_RETURN_TYPE:
5374         Record.push_back(GetOrCreateTypeID(Update.getType()));
5375         break;
5376 
5377       case UPD_DECL_MARKED_USED:
5378         break;
5379 
5380       case UPD_MANGLING_NUMBER:
5381       case UPD_STATIC_LOCAL_NUMBER:
5382         Record.push_back(Update.getNumber());
5383         break;
5384 
5385       case UPD_DECL_MARKED_OPENMP_THREADPRIVATE:
5386         Record.AddSourceRange(
5387             D->getAttr<OMPThreadPrivateDeclAttr>()->getRange());
5388         break;
5389 
5390       case UPD_DECL_MARKED_OPENMP_ALLOCATE: {
5391         auto *A = D->getAttr<OMPAllocateDeclAttr>();
5392         Record.push_back(A->getAllocatorType());
5393         Record.AddStmt(A->getAllocator());
5394         Record.AddSourceRange(A->getRange());
5395         break;
5396       }
5397 
5398       case UPD_DECL_MARKED_OPENMP_DECLARETARGET:
5399         Record.push_back(D->getAttr<OMPDeclareTargetDeclAttr>()->getMapType());
5400         Record.AddSourceRange(
5401             D->getAttr<OMPDeclareTargetDeclAttr>()->getRange());
5402         break;
5403 
5404       case UPD_DECL_EXPORTED:
5405         Record.push_back(getSubmoduleID(Update.getModule()));
5406         break;
5407 
5408       case UPD_ADDED_ATTR_TO_RECORD:
5409         Record.AddAttributes(llvm::makeArrayRef(Update.getAttr()));
5410         break;
5411       }
5412     }
5413 
5414     if (HasUpdatedBody) {
5415       const auto *Def = cast<FunctionDecl>(D);
5416       Record.push_back(UPD_CXX_ADDED_FUNCTION_DEFINITION);
5417       Record.push_back(Def->isInlined());
5418       Record.AddSourceLocation(Def->getInnerLocStart());
5419       Record.AddFunctionDefinition(Def);
5420     }
5421 
5422     OffsetsRecord.push_back(GetDeclRef(D));
5423     OffsetsRecord.push_back(Record.Emit(DECL_UPDATES));
5424   }
5425 }
5426 
5427 void ASTWriter::AddSourceLocation(SourceLocation Loc, RecordDataImpl &Record) {
5428   uint32_t Raw = Loc.getRawEncoding();
5429   Record.push_back((Raw << 1) | (Raw >> 31));
5430 }
5431 
5432 void ASTWriter::AddSourceRange(SourceRange Range, RecordDataImpl &Record) {
5433   AddSourceLocation(Range.getBegin(), Record);
5434   AddSourceLocation(Range.getEnd(), Record);
5435 }
5436 
5437 void ASTRecordWriter::AddAPInt(const llvm::APInt &Value) {
5438   Record->push_back(Value.getBitWidth());
5439   const uint64_t *Words = Value.getRawData();
5440   Record->append(Words, Words + Value.getNumWords());
5441 }
5442 
5443 void ASTRecordWriter::AddAPSInt(const llvm::APSInt &Value) {
5444   Record->push_back(Value.isUnsigned());
5445   AddAPInt(Value);
5446 }
5447 
5448 void ASTRecordWriter::AddAPFloat(const llvm::APFloat &Value) {
5449   AddAPInt(Value.bitcastToAPInt());
5450 }
5451 
5452 static void WriteFixedPointSemantics(ASTRecordWriter &Record,
5453                                      FixedPointSemantics FPSema) {
5454   Record.push_back(FPSema.getWidth());
5455   Record.push_back(FPSema.getScale());
5456   Record.push_back(FPSema.isSigned() | FPSema.isSaturated() << 1 |
5457                    FPSema.hasUnsignedPadding() << 2);
5458 }
5459 
5460 void ASTRecordWriter::AddAPValue(const APValue &Value) {
5461   APValue::ValueKind Kind = Value.getKind();
5462   push_back(static_cast<uint64_t>(Kind));
5463   switch (Kind) {
5464   case APValue::None:
5465   case APValue::Indeterminate:
5466     return;
5467   case APValue::Int:
5468     AddAPSInt(Value.getInt());
5469     return;
5470   case APValue::Float:
5471     push_back(static_cast<uint64_t>(
5472         llvm::APFloatBase::SemanticsToEnum(Value.getFloat().getSemantics())));
5473     AddAPFloat(Value.getFloat());
5474     return;
5475   case APValue::FixedPoint: {
5476     WriteFixedPointSemantics(*this, Value.getFixedPoint().getSemantics());
5477     AddAPSInt(Value.getFixedPoint().getValue());
5478     return;
5479   }
5480   case APValue::ComplexInt: {
5481     AddAPSInt(Value.getComplexIntReal());
5482     AddAPSInt(Value.getComplexIntImag());
5483     return;
5484   }
5485   case APValue::ComplexFloat: {
5486     push_back(static_cast<uint64_t>(llvm::APFloatBase::SemanticsToEnum(
5487         Value.getComplexFloatReal().getSemantics())));
5488     AddAPFloat(Value.getComplexFloatReal());
5489     push_back(static_cast<uint64_t>(llvm::APFloatBase::SemanticsToEnum(
5490         Value.getComplexFloatImag().getSemantics())));
5491     AddAPFloat(Value.getComplexFloatImag());
5492     return;
5493   }
5494   case APValue::LValue:
5495   case APValue::Vector:
5496   case APValue::Array:
5497   case APValue::Struct:
5498   case APValue::Union:
5499   case APValue::MemberPointer:
5500   case APValue::AddrLabelDiff:
5501     // TODO : Handle all these APValue::ValueKind.
5502     return;
5503   }
5504   llvm_unreachable("Invalid APValue::ValueKind");
5505 }
5506 
5507 void ASTWriter::AddIdentifierRef(const IdentifierInfo *II, RecordDataImpl &Record) {
5508   Record.push_back(getIdentifierRef(II));
5509 }
5510 
5511 IdentID ASTWriter::getIdentifierRef(const IdentifierInfo *II) {
5512   if (!II)
5513     return 0;
5514 
5515   IdentID &ID = IdentifierIDs[II];
5516   if (ID == 0)
5517     ID = NextIdentID++;
5518   return ID;
5519 }
5520 
5521 MacroID ASTWriter::getMacroRef(MacroInfo *MI, const IdentifierInfo *Name) {
5522   // Don't emit builtin macros like __LINE__ to the AST file unless they
5523   // have been redefined by the header (in which case they are not
5524   // isBuiltinMacro).
5525   if (!MI || MI->isBuiltinMacro())
5526     return 0;
5527 
5528   MacroID &ID = MacroIDs[MI];
5529   if (ID == 0) {
5530     ID = NextMacroID++;
5531     MacroInfoToEmitData Info = { Name, MI, ID };
5532     MacroInfosToEmit.push_back(Info);
5533   }
5534   return ID;
5535 }
5536 
5537 MacroID ASTWriter::getMacroID(MacroInfo *MI) {
5538   if (!MI || MI->isBuiltinMacro())
5539     return 0;
5540 
5541   assert(MacroIDs.find(MI) != MacroIDs.end() && "Macro not emitted!");
5542   return MacroIDs[MI];
5543 }
5544 
5545 uint64_t ASTWriter::getMacroDirectivesOffset(const IdentifierInfo *Name) {
5546   return IdentMacroDirectivesOffsetMap.lookup(Name);
5547 }
5548 
5549 void ASTRecordWriter::AddSelectorRef(const Selector SelRef) {
5550   Record->push_back(Writer->getSelectorRef(SelRef));
5551 }
5552 
5553 SelectorID ASTWriter::getSelectorRef(Selector Sel) {
5554   if (Sel.getAsOpaquePtr() == nullptr) {
5555     return 0;
5556   }
5557 
5558   SelectorID SID = SelectorIDs[Sel];
5559   if (SID == 0 && Chain) {
5560     // This might trigger a ReadSelector callback, which will set the ID for
5561     // this selector.
5562     Chain->LoadSelector(Sel);
5563     SID = SelectorIDs[Sel];
5564   }
5565   if (SID == 0) {
5566     SID = NextSelectorID++;
5567     SelectorIDs[Sel] = SID;
5568   }
5569   return SID;
5570 }
5571 
5572 void ASTRecordWriter::AddCXXTemporary(const CXXTemporary *Temp) {
5573   AddDeclRef(Temp->getDestructor());
5574 }
5575 
5576 void ASTRecordWriter::AddTemplateArgumentLocInfo(
5577     TemplateArgument::ArgKind Kind, const TemplateArgumentLocInfo &Arg) {
5578   switch (Kind) {
5579   case TemplateArgument::Expression:
5580     AddStmt(Arg.getAsExpr());
5581     break;
5582   case TemplateArgument::Type:
5583     AddTypeSourceInfo(Arg.getAsTypeSourceInfo());
5584     break;
5585   case TemplateArgument::Template:
5586     AddNestedNameSpecifierLoc(Arg.getTemplateQualifierLoc());
5587     AddSourceLocation(Arg.getTemplateNameLoc());
5588     break;
5589   case TemplateArgument::TemplateExpansion:
5590     AddNestedNameSpecifierLoc(Arg.getTemplateQualifierLoc());
5591     AddSourceLocation(Arg.getTemplateNameLoc());
5592     AddSourceLocation(Arg.getTemplateEllipsisLoc());
5593     break;
5594   case TemplateArgument::Null:
5595   case TemplateArgument::Integral:
5596   case TemplateArgument::Declaration:
5597   case TemplateArgument::NullPtr:
5598   case TemplateArgument::Pack:
5599     // FIXME: Is this right?
5600     break;
5601   }
5602 }
5603 
5604 void ASTRecordWriter::AddTemplateArgumentLoc(const TemplateArgumentLoc &Arg) {
5605   AddTemplateArgument(Arg.getArgument());
5606 
5607   if (Arg.getArgument().getKind() == TemplateArgument::Expression) {
5608     bool InfoHasSameExpr
5609       = Arg.getArgument().getAsExpr() == Arg.getLocInfo().getAsExpr();
5610     Record->push_back(InfoHasSameExpr);
5611     if (InfoHasSameExpr)
5612       return; // Avoid storing the same expr twice.
5613   }
5614   AddTemplateArgumentLocInfo(Arg.getArgument().getKind(), Arg.getLocInfo());
5615 }
5616 
5617 void ASTRecordWriter::AddTypeSourceInfo(TypeSourceInfo *TInfo) {
5618   if (!TInfo) {
5619     AddTypeRef(QualType());
5620     return;
5621   }
5622 
5623   AddTypeRef(TInfo->getType());
5624   AddTypeLoc(TInfo->getTypeLoc());
5625 }
5626 
5627 void ASTRecordWriter::AddTypeLoc(TypeLoc TL) {
5628   TypeLocWriter TLW(*this);
5629   for (; !TL.isNull(); TL = TL.getNextTypeLoc())
5630     TLW.Visit(TL);
5631 }
5632 
5633 void ASTWriter::AddTypeRef(QualType T, RecordDataImpl &Record) {
5634   Record.push_back(GetOrCreateTypeID(T));
5635 }
5636 
5637 TypeID ASTWriter::GetOrCreateTypeID(QualType T) {
5638   assert(Context);
5639   return MakeTypeID(*Context, T, [&](QualType T) -> TypeIdx {
5640     if (T.isNull())
5641       return TypeIdx();
5642     assert(!T.getLocalFastQualifiers());
5643 
5644     TypeIdx &Idx = TypeIdxs[T];
5645     if (Idx.getIndex() == 0) {
5646       if (DoneWritingDeclsAndTypes) {
5647         assert(0 && "New type seen after serializing all the types to emit!");
5648         return TypeIdx();
5649       }
5650 
5651       // We haven't seen this type before. Assign it a new ID and put it
5652       // into the queue of types to emit.
5653       Idx = TypeIdx(NextTypeID++);
5654       DeclTypesToEmit.push(T);
5655     }
5656     return Idx;
5657   });
5658 }
5659 
5660 TypeID ASTWriter::getTypeID(QualType T) const {
5661   assert(Context);
5662   return MakeTypeID(*Context, T, [&](QualType T) -> TypeIdx {
5663     if (T.isNull())
5664       return TypeIdx();
5665     assert(!T.getLocalFastQualifiers());
5666 
5667     TypeIdxMap::const_iterator I = TypeIdxs.find(T);
5668     assert(I != TypeIdxs.end() && "Type not emitted!");
5669     return I->second;
5670   });
5671 }
5672 
5673 void ASTWriter::AddDeclRef(const Decl *D, RecordDataImpl &Record) {
5674   Record.push_back(GetDeclRef(D));
5675 }
5676 
5677 DeclID ASTWriter::GetDeclRef(const Decl *D) {
5678   assert(WritingAST && "Cannot request a declaration ID before AST writing");
5679 
5680   if (!D) {
5681     return 0;
5682   }
5683 
5684   // If D comes from an AST file, its declaration ID is already known and
5685   // fixed.
5686   if (D->isFromASTFile())
5687     return D->getGlobalID();
5688 
5689   assert(!(reinterpret_cast<uintptr_t>(D) & 0x01) && "Invalid decl pointer");
5690   DeclID &ID = DeclIDs[D];
5691   if (ID == 0) {
5692     if (DoneWritingDeclsAndTypes) {
5693       assert(0 && "New decl seen after serializing all the decls to emit!");
5694       return 0;
5695     }
5696 
5697     // We haven't seen this declaration before. Give it a new ID and
5698     // enqueue it in the list of declarations to emit.
5699     ID = NextDeclID++;
5700     DeclTypesToEmit.push(const_cast<Decl *>(D));
5701   }
5702 
5703   return ID;
5704 }
5705 
5706 DeclID ASTWriter::getDeclID(const Decl *D) {
5707   if (!D)
5708     return 0;
5709 
5710   // If D comes from an AST file, its declaration ID is already known and
5711   // fixed.
5712   if (D->isFromASTFile())
5713     return D->getGlobalID();
5714 
5715   assert(DeclIDs.find(D) != DeclIDs.end() && "Declaration not emitted!");
5716   return DeclIDs[D];
5717 }
5718 
5719 void ASTWriter::associateDeclWithFile(const Decl *D, DeclID ID) {
5720   assert(ID);
5721   assert(D);
5722 
5723   SourceLocation Loc = D->getLocation();
5724   if (Loc.isInvalid())
5725     return;
5726 
5727   // We only keep track of the file-level declarations of each file.
5728   if (!D->getLexicalDeclContext()->isFileContext())
5729     return;
5730   // FIXME: ParmVarDecls that are part of a function type of a parameter of
5731   // a function/objc method, should not have TU as lexical context.
5732   // TemplateTemplateParmDecls that are part of an alias template, should not
5733   // have TU as lexical context.
5734   if (isa<ParmVarDecl>(D) || isa<TemplateTemplateParmDecl>(D))
5735     return;
5736 
5737   SourceManager &SM = Context->getSourceManager();
5738   SourceLocation FileLoc = SM.getFileLoc(Loc);
5739   assert(SM.isLocalSourceLocation(FileLoc));
5740   FileID FID;
5741   unsigned Offset;
5742   std::tie(FID, Offset) = SM.getDecomposedLoc(FileLoc);
5743   if (FID.isInvalid())
5744     return;
5745   assert(SM.getSLocEntry(FID).isFile());
5746 
5747   DeclIDInFileInfo *&Info = FileDeclIDs[FID];
5748   if (!Info)
5749     Info = new DeclIDInFileInfo();
5750 
5751   std::pair<unsigned, serialization::DeclID> LocDecl(Offset, ID);
5752   LocDeclIDsTy &Decls = Info->DeclIDs;
5753 
5754   if (Decls.empty() || Decls.back().first <= Offset) {
5755     Decls.push_back(LocDecl);
5756     return;
5757   }
5758 
5759   LocDeclIDsTy::iterator I =
5760       llvm::upper_bound(Decls, LocDecl, llvm::less_first());
5761 
5762   Decls.insert(I, LocDecl);
5763 }
5764 
5765 void ASTRecordWriter::AddDeclarationName(DeclarationName Name) {
5766   // FIXME: Emit a stable enum for NameKind.  0 = Identifier etc.
5767   Record->push_back(Name.getNameKind());
5768   switch (Name.getNameKind()) {
5769   case DeclarationName::Identifier:
5770     AddIdentifierRef(Name.getAsIdentifierInfo());
5771     break;
5772 
5773   case DeclarationName::ObjCZeroArgSelector:
5774   case DeclarationName::ObjCOneArgSelector:
5775   case DeclarationName::ObjCMultiArgSelector:
5776     AddSelectorRef(Name.getObjCSelector());
5777     break;
5778 
5779   case DeclarationName::CXXConstructorName:
5780   case DeclarationName::CXXDestructorName:
5781   case DeclarationName::CXXConversionFunctionName:
5782     AddTypeRef(Name.getCXXNameType());
5783     break;
5784 
5785   case DeclarationName::CXXDeductionGuideName:
5786     AddDeclRef(Name.getCXXDeductionGuideTemplate());
5787     break;
5788 
5789   case DeclarationName::CXXOperatorName:
5790     Record->push_back(Name.getCXXOverloadedOperator());
5791     break;
5792 
5793   case DeclarationName::CXXLiteralOperatorName:
5794     AddIdentifierRef(Name.getCXXLiteralIdentifier());
5795     break;
5796 
5797   case DeclarationName::CXXUsingDirective:
5798     // No extra data to emit
5799     break;
5800   }
5801 }
5802 
5803 unsigned ASTWriter::getAnonymousDeclarationNumber(const NamedDecl *D) {
5804   assert(needsAnonymousDeclarationNumber(D) &&
5805          "expected an anonymous declaration");
5806 
5807   // Number the anonymous declarations within this context, if we've not
5808   // already done so.
5809   auto It = AnonymousDeclarationNumbers.find(D);
5810   if (It == AnonymousDeclarationNumbers.end()) {
5811     auto *DC = D->getLexicalDeclContext();
5812     numberAnonymousDeclsWithin(DC, [&](const NamedDecl *ND, unsigned Number) {
5813       AnonymousDeclarationNumbers[ND] = Number;
5814     });
5815 
5816     It = AnonymousDeclarationNumbers.find(D);
5817     assert(It != AnonymousDeclarationNumbers.end() &&
5818            "declaration not found within its lexical context");
5819   }
5820 
5821   return It->second;
5822 }
5823 
5824 void ASTRecordWriter::AddDeclarationNameLoc(const DeclarationNameLoc &DNLoc,
5825                                             DeclarationName Name) {
5826   switch (Name.getNameKind()) {
5827   case DeclarationName::CXXConstructorName:
5828   case DeclarationName::CXXDestructorName:
5829   case DeclarationName::CXXConversionFunctionName:
5830     AddTypeSourceInfo(DNLoc.NamedType.TInfo);
5831     break;
5832 
5833   case DeclarationName::CXXOperatorName:
5834     AddSourceLocation(SourceLocation::getFromRawEncoding(
5835         DNLoc.CXXOperatorName.BeginOpNameLoc));
5836     AddSourceLocation(
5837         SourceLocation::getFromRawEncoding(DNLoc.CXXOperatorName.EndOpNameLoc));
5838     break;
5839 
5840   case DeclarationName::CXXLiteralOperatorName:
5841     AddSourceLocation(SourceLocation::getFromRawEncoding(
5842         DNLoc.CXXLiteralOperatorName.OpNameLoc));
5843     break;
5844 
5845   case DeclarationName::Identifier:
5846   case DeclarationName::ObjCZeroArgSelector:
5847   case DeclarationName::ObjCOneArgSelector:
5848   case DeclarationName::ObjCMultiArgSelector:
5849   case DeclarationName::CXXUsingDirective:
5850   case DeclarationName::CXXDeductionGuideName:
5851     break;
5852   }
5853 }
5854 
5855 void ASTRecordWriter::AddDeclarationNameInfo(
5856     const DeclarationNameInfo &NameInfo) {
5857   AddDeclarationName(NameInfo.getName());
5858   AddSourceLocation(NameInfo.getLoc());
5859   AddDeclarationNameLoc(NameInfo.getInfo(), NameInfo.getName());
5860 }
5861 
5862 void ASTRecordWriter::AddQualifierInfo(const QualifierInfo &Info) {
5863   AddNestedNameSpecifierLoc(Info.QualifierLoc);
5864   Record->push_back(Info.NumTemplParamLists);
5865   for (unsigned i = 0, e = Info.NumTemplParamLists; i != e; ++i)
5866     AddTemplateParameterList(Info.TemplParamLists[i]);
5867 }
5868 
5869 void ASTRecordWriter::AddNestedNameSpecifier(NestedNameSpecifier *NNS) {
5870   // Nested name specifiers usually aren't too long. I think that 8 would
5871   // typically accommodate the vast majority.
5872   SmallVector<NestedNameSpecifier *, 8> NestedNames;
5873 
5874   // Push each of the NNS's onto a stack for serialization in reverse order.
5875   while (NNS) {
5876     NestedNames.push_back(NNS);
5877     NNS = NNS->getPrefix();
5878   }
5879 
5880   Record->push_back(NestedNames.size());
5881   while(!NestedNames.empty()) {
5882     NNS = NestedNames.pop_back_val();
5883     NestedNameSpecifier::SpecifierKind Kind = NNS->getKind();
5884     Record->push_back(Kind);
5885     switch (Kind) {
5886     case NestedNameSpecifier::Identifier:
5887       AddIdentifierRef(NNS->getAsIdentifier());
5888       break;
5889 
5890     case NestedNameSpecifier::Namespace:
5891       AddDeclRef(NNS->getAsNamespace());
5892       break;
5893 
5894     case NestedNameSpecifier::NamespaceAlias:
5895       AddDeclRef(NNS->getAsNamespaceAlias());
5896       break;
5897 
5898     case NestedNameSpecifier::TypeSpec:
5899     case NestedNameSpecifier::TypeSpecWithTemplate:
5900       AddTypeRef(QualType(NNS->getAsType(), 0));
5901       Record->push_back(Kind == NestedNameSpecifier::TypeSpecWithTemplate);
5902       break;
5903 
5904     case NestedNameSpecifier::Global:
5905       // Don't need to write an associated value.
5906       break;
5907 
5908     case NestedNameSpecifier::Super:
5909       AddDeclRef(NNS->getAsRecordDecl());
5910       break;
5911     }
5912   }
5913 }
5914 
5915 void ASTRecordWriter::AddNestedNameSpecifierLoc(NestedNameSpecifierLoc NNS) {
5916   // Nested name specifiers usually aren't too long. I think that 8 would
5917   // typically accommodate the vast majority.
5918   SmallVector<NestedNameSpecifierLoc , 8> NestedNames;
5919 
5920   // Push each of the nested-name-specifiers's onto a stack for
5921   // serialization in reverse order.
5922   while (NNS) {
5923     NestedNames.push_back(NNS);
5924     NNS = NNS.getPrefix();
5925   }
5926 
5927   Record->push_back(NestedNames.size());
5928   while(!NestedNames.empty()) {
5929     NNS = NestedNames.pop_back_val();
5930     NestedNameSpecifier::SpecifierKind Kind
5931       = NNS.getNestedNameSpecifier()->getKind();
5932     Record->push_back(Kind);
5933     switch (Kind) {
5934     case NestedNameSpecifier::Identifier:
5935       AddIdentifierRef(NNS.getNestedNameSpecifier()->getAsIdentifier());
5936       AddSourceRange(NNS.getLocalSourceRange());
5937       break;
5938 
5939     case NestedNameSpecifier::Namespace:
5940       AddDeclRef(NNS.getNestedNameSpecifier()->getAsNamespace());
5941       AddSourceRange(NNS.getLocalSourceRange());
5942       break;
5943 
5944     case NestedNameSpecifier::NamespaceAlias:
5945       AddDeclRef(NNS.getNestedNameSpecifier()->getAsNamespaceAlias());
5946       AddSourceRange(NNS.getLocalSourceRange());
5947       break;
5948 
5949     case NestedNameSpecifier::TypeSpec:
5950     case NestedNameSpecifier::TypeSpecWithTemplate:
5951       Record->push_back(Kind == NestedNameSpecifier::TypeSpecWithTemplate);
5952       AddTypeRef(NNS.getTypeLoc().getType());
5953       AddTypeLoc(NNS.getTypeLoc());
5954       AddSourceLocation(NNS.getLocalSourceRange().getEnd());
5955       break;
5956 
5957     case NestedNameSpecifier::Global:
5958       AddSourceLocation(NNS.getLocalSourceRange().getEnd());
5959       break;
5960 
5961     case NestedNameSpecifier::Super:
5962       AddDeclRef(NNS.getNestedNameSpecifier()->getAsRecordDecl());
5963       AddSourceRange(NNS.getLocalSourceRange());
5964       break;
5965     }
5966   }
5967 }
5968 
5969 void ASTRecordWriter::AddTemplateName(TemplateName Name) {
5970   TemplateName::NameKind Kind = Name.getKind();
5971   Record->push_back(Kind);
5972   switch (Kind) {
5973   case TemplateName::Template:
5974     AddDeclRef(Name.getAsTemplateDecl());
5975     break;
5976 
5977   case TemplateName::OverloadedTemplate: {
5978     OverloadedTemplateStorage *OvT = Name.getAsOverloadedTemplate();
5979     Record->push_back(OvT->size());
5980     for (const auto &I : *OvT)
5981       AddDeclRef(I);
5982     break;
5983   }
5984 
5985   case TemplateName::AssumedTemplate: {
5986     AssumedTemplateStorage *ADLT = Name.getAsAssumedTemplateName();
5987     AddDeclarationName(ADLT->getDeclName());
5988     break;
5989   }
5990 
5991   case TemplateName::QualifiedTemplate: {
5992     QualifiedTemplateName *QualT = Name.getAsQualifiedTemplateName();
5993     AddNestedNameSpecifier(QualT->getQualifier());
5994     Record->push_back(QualT->hasTemplateKeyword());
5995     AddDeclRef(QualT->getTemplateDecl());
5996     break;
5997   }
5998 
5999   case TemplateName::DependentTemplate: {
6000     DependentTemplateName *DepT = Name.getAsDependentTemplateName();
6001     AddNestedNameSpecifier(DepT->getQualifier());
6002     Record->push_back(DepT->isIdentifier());
6003     if (DepT->isIdentifier())
6004       AddIdentifierRef(DepT->getIdentifier());
6005     else
6006       Record->push_back(DepT->getOperator());
6007     break;
6008   }
6009 
6010   case TemplateName::SubstTemplateTemplateParm: {
6011     SubstTemplateTemplateParmStorage *subst
6012       = Name.getAsSubstTemplateTemplateParm();
6013     AddDeclRef(subst->getParameter());
6014     AddTemplateName(subst->getReplacement());
6015     break;
6016   }
6017 
6018   case TemplateName::SubstTemplateTemplateParmPack: {
6019     SubstTemplateTemplateParmPackStorage *SubstPack
6020       = Name.getAsSubstTemplateTemplateParmPack();
6021     AddDeclRef(SubstPack->getParameterPack());
6022     AddTemplateArgument(SubstPack->getArgumentPack());
6023     break;
6024   }
6025   }
6026 }
6027 
6028 void ASTRecordWriter::AddTemplateArgument(const TemplateArgument &Arg) {
6029   Record->push_back(Arg.getKind());
6030   switch (Arg.getKind()) {
6031   case TemplateArgument::Null:
6032     break;
6033   case TemplateArgument::Type:
6034     AddTypeRef(Arg.getAsType());
6035     break;
6036   case TemplateArgument::Declaration:
6037     AddDeclRef(Arg.getAsDecl());
6038     AddTypeRef(Arg.getParamTypeForDecl());
6039     break;
6040   case TemplateArgument::NullPtr:
6041     AddTypeRef(Arg.getNullPtrType());
6042     break;
6043   case TemplateArgument::Integral:
6044     AddAPSInt(Arg.getAsIntegral());
6045     AddTypeRef(Arg.getIntegralType());
6046     break;
6047   case TemplateArgument::Template:
6048     AddTemplateName(Arg.getAsTemplateOrTemplatePattern());
6049     break;
6050   case TemplateArgument::TemplateExpansion:
6051     AddTemplateName(Arg.getAsTemplateOrTemplatePattern());
6052     if (Optional<unsigned> NumExpansions = Arg.getNumTemplateExpansions())
6053       Record->push_back(*NumExpansions + 1);
6054     else
6055       Record->push_back(0);
6056     break;
6057   case TemplateArgument::Expression:
6058     AddStmt(Arg.getAsExpr());
6059     break;
6060   case TemplateArgument::Pack:
6061     Record->push_back(Arg.pack_size());
6062     for (const auto &P : Arg.pack_elements())
6063       AddTemplateArgument(P);
6064     break;
6065   }
6066 }
6067 
6068 void ASTRecordWriter::AddTemplateParameterList(
6069     const TemplateParameterList *TemplateParams) {
6070   assert(TemplateParams && "No TemplateParams!");
6071   AddSourceLocation(TemplateParams->getTemplateLoc());
6072   AddSourceLocation(TemplateParams->getLAngleLoc());
6073   AddSourceLocation(TemplateParams->getRAngleLoc());
6074 
6075   Record->push_back(TemplateParams->size());
6076   for (const auto &P : *TemplateParams)
6077     AddDeclRef(P);
6078   if (const Expr *RequiresClause = TemplateParams->getRequiresClause()) {
6079     Record->push_back(true);
6080     AddStmt(const_cast<Expr*>(RequiresClause));
6081   } else {
6082     Record->push_back(false);
6083   }
6084 }
6085 
6086 /// Emit a template argument list.
6087 void ASTRecordWriter::AddTemplateArgumentList(
6088     const TemplateArgumentList *TemplateArgs) {
6089   assert(TemplateArgs && "No TemplateArgs!");
6090   Record->push_back(TemplateArgs->size());
6091   for (int i = 0, e = TemplateArgs->size(); i != e; ++i)
6092     AddTemplateArgument(TemplateArgs->get(i));
6093 }
6094 
6095 void ASTRecordWriter::AddASTTemplateArgumentListInfo(
6096     const ASTTemplateArgumentListInfo *ASTTemplArgList) {
6097   assert(ASTTemplArgList && "No ASTTemplArgList!");
6098   AddSourceLocation(ASTTemplArgList->LAngleLoc);
6099   AddSourceLocation(ASTTemplArgList->RAngleLoc);
6100   Record->push_back(ASTTemplArgList->NumTemplateArgs);
6101   const TemplateArgumentLoc *TemplArgs = ASTTemplArgList->getTemplateArgs();
6102   for (int i = 0, e = ASTTemplArgList->NumTemplateArgs; i != e; ++i)
6103     AddTemplateArgumentLoc(TemplArgs[i]);
6104 }
6105 
6106 void ASTRecordWriter::AddUnresolvedSet(const ASTUnresolvedSet &Set) {
6107   Record->push_back(Set.size());
6108   for (ASTUnresolvedSet::const_iterator
6109          I = Set.begin(), E = Set.end(); I != E; ++I) {
6110     AddDeclRef(I.getDecl());
6111     Record->push_back(I.getAccess());
6112   }
6113 }
6114 
6115 // FIXME: Move this out of the main ASTRecordWriter interface.
6116 void ASTRecordWriter::AddCXXBaseSpecifier(const CXXBaseSpecifier &Base) {
6117   Record->push_back(Base.isVirtual());
6118   Record->push_back(Base.isBaseOfClass());
6119   Record->push_back(Base.getAccessSpecifierAsWritten());
6120   Record->push_back(Base.getInheritConstructors());
6121   AddTypeSourceInfo(Base.getTypeSourceInfo());
6122   AddSourceRange(Base.getSourceRange());
6123   AddSourceLocation(Base.isPackExpansion()? Base.getEllipsisLoc()
6124                                           : SourceLocation());
6125 }
6126 
6127 static uint64_t EmitCXXBaseSpecifiers(ASTWriter &W,
6128                                       ArrayRef<CXXBaseSpecifier> Bases) {
6129   ASTWriter::RecordData Record;
6130   ASTRecordWriter Writer(W, Record);
6131   Writer.push_back(Bases.size());
6132 
6133   for (auto &Base : Bases)
6134     Writer.AddCXXBaseSpecifier(Base);
6135 
6136   return Writer.Emit(serialization::DECL_CXX_BASE_SPECIFIERS);
6137 }
6138 
6139 // FIXME: Move this out of the main ASTRecordWriter interface.
6140 void ASTRecordWriter::AddCXXBaseSpecifiers(ArrayRef<CXXBaseSpecifier> Bases) {
6141   AddOffset(EmitCXXBaseSpecifiers(*Writer, Bases));
6142 }
6143 
6144 static uint64_t
6145 EmitCXXCtorInitializers(ASTWriter &W,
6146                         ArrayRef<CXXCtorInitializer *> CtorInits) {
6147   ASTWriter::RecordData Record;
6148   ASTRecordWriter Writer(W, Record);
6149   Writer.push_back(CtorInits.size());
6150 
6151   for (auto *Init : CtorInits) {
6152     if (Init->isBaseInitializer()) {
6153       Writer.push_back(CTOR_INITIALIZER_BASE);
6154       Writer.AddTypeSourceInfo(Init->getTypeSourceInfo());
6155       Writer.push_back(Init->isBaseVirtual());
6156     } else if (Init->isDelegatingInitializer()) {
6157       Writer.push_back(CTOR_INITIALIZER_DELEGATING);
6158       Writer.AddTypeSourceInfo(Init->getTypeSourceInfo());
6159     } else if (Init->isMemberInitializer()){
6160       Writer.push_back(CTOR_INITIALIZER_MEMBER);
6161       Writer.AddDeclRef(Init->getMember());
6162     } else {
6163       Writer.push_back(CTOR_INITIALIZER_INDIRECT_MEMBER);
6164       Writer.AddDeclRef(Init->getIndirectMember());
6165     }
6166 
6167     Writer.AddSourceLocation(Init->getMemberLocation());
6168     Writer.AddStmt(Init->getInit());
6169     Writer.AddSourceLocation(Init->getLParenLoc());
6170     Writer.AddSourceLocation(Init->getRParenLoc());
6171     Writer.push_back(Init->isWritten());
6172     if (Init->isWritten())
6173       Writer.push_back(Init->getSourceOrder());
6174   }
6175 
6176   return Writer.Emit(serialization::DECL_CXX_CTOR_INITIALIZERS);
6177 }
6178 
6179 // FIXME: Move this out of the main ASTRecordWriter interface.
6180 void ASTRecordWriter::AddCXXCtorInitializers(
6181     ArrayRef<CXXCtorInitializer *> CtorInits) {
6182   AddOffset(EmitCXXCtorInitializers(*Writer, CtorInits));
6183 }
6184 
6185 void ASTRecordWriter::AddCXXDefinitionData(const CXXRecordDecl *D) {
6186   auto &Data = D->data();
6187   Record->push_back(Data.IsLambda);
6188 
6189   #define FIELD(Name, Width, Merge) \
6190   Record->push_back(Data.Name);
6191   #include "clang/AST/CXXRecordDeclDefinitionBits.def"
6192 
6193   // getODRHash will compute the ODRHash if it has not been previously computed.
6194   Record->push_back(D->getODRHash());
6195   bool ModulesDebugInfo = Writer->Context->getLangOpts().ModulesDebugInfo &&
6196                           Writer->WritingModule && !D->isDependentType();
6197   Record->push_back(ModulesDebugInfo);
6198   if (ModulesDebugInfo)
6199     Writer->ModularCodegenDecls.push_back(Writer->GetDeclRef(D));
6200 
6201   // IsLambda bit is already saved.
6202 
6203   Record->push_back(Data.NumBases);
6204   if (Data.NumBases > 0)
6205     AddCXXBaseSpecifiers(Data.bases());
6206 
6207   // FIXME: Make VBases lazily computed when needed to avoid storing them.
6208   Record->push_back(Data.NumVBases);
6209   if (Data.NumVBases > 0)
6210     AddCXXBaseSpecifiers(Data.vbases());
6211 
6212   AddUnresolvedSet(Data.Conversions.get(*Writer->Context));
6213   Record->push_back(Data.ComputedVisibleConversions);
6214   if (Data.ComputedVisibleConversions)
6215     AddUnresolvedSet(Data.VisibleConversions.get(*Writer->Context));
6216   // Data.Definition is the owning decl, no need to write it.
6217   AddDeclRef(D->getFirstFriend());
6218 
6219   // Add lambda-specific data.
6220   if (Data.IsLambda) {
6221     auto &Lambda = D->getLambdaData();
6222     Record->push_back(Lambda.Dependent);
6223     Record->push_back(Lambda.IsGenericLambda);
6224     Record->push_back(Lambda.CaptureDefault);
6225     Record->push_back(Lambda.NumCaptures);
6226     Record->push_back(Lambda.NumExplicitCaptures);
6227     Record->push_back(Lambda.HasKnownInternalLinkage);
6228     Record->push_back(Lambda.ManglingNumber);
6229     AddDeclRef(D->getLambdaContextDecl());
6230     AddTypeSourceInfo(Lambda.MethodTyInfo);
6231     for (unsigned I = 0, N = Lambda.NumCaptures; I != N; ++I) {
6232       const LambdaCapture &Capture = Lambda.Captures[I];
6233       AddSourceLocation(Capture.getLocation());
6234       Record->push_back(Capture.isImplicit());
6235       Record->push_back(Capture.getCaptureKind());
6236       switch (Capture.getCaptureKind()) {
6237       case LCK_StarThis:
6238       case LCK_This:
6239       case LCK_VLAType:
6240         break;
6241       case LCK_ByCopy:
6242       case LCK_ByRef:
6243         VarDecl *Var =
6244             Capture.capturesVariable() ? Capture.getCapturedVar() : nullptr;
6245         AddDeclRef(Var);
6246         AddSourceLocation(Capture.isPackExpansion() ? Capture.getEllipsisLoc()
6247                                                     : SourceLocation());
6248         break;
6249       }
6250     }
6251   }
6252 }
6253 
6254 void ASTWriter::ReaderInitialized(ASTReader *Reader) {
6255   assert(Reader && "Cannot remove chain");
6256   assert((!Chain || Chain == Reader) && "Cannot replace chain");
6257   assert(FirstDeclID == NextDeclID &&
6258          FirstTypeID == NextTypeID &&
6259          FirstIdentID == NextIdentID &&
6260          FirstMacroID == NextMacroID &&
6261          FirstSubmoduleID == NextSubmoduleID &&
6262          FirstSelectorID == NextSelectorID &&
6263          "Setting chain after writing has started.");
6264 
6265   Chain = Reader;
6266 
6267   // Note, this will get called multiple times, once one the reader starts up
6268   // and again each time it's done reading a PCH or module.
6269   FirstDeclID = NUM_PREDEF_DECL_IDS + Chain->getTotalNumDecls();
6270   FirstTypeID = NUM_PREDEF_TYPE_IDS + Chain->getTotalNumTypes();
6271   FirstIdentID = NUM_PREDEF_IDENT_IDS + Chain->getTotalNumIdentifiers();
6272   FirstMacroID = NUM_PREDEF_MACRO_IDS + Chain->getTotalNumMacros();
6273   FirstSubmoduleID = NUM_PREDEF_SUBMODULE_IDS + Chain->getTotalNumSubmodules();
6274   FirstSelectorID = NUM_PREDEF_SELECTOR_IDS + Chain->getTotalNumSelectors();
6275   NextDeclID = FirstDeclID;
6276   NextTypeID = FirstTypeID;
6277   NextIdentID = FirstIdentID;
6278   NextMacroID = FirstMacroID;
6279   NextSelectorID = FirstSelectorID;
6280   NextSubmoduleID = FirstSubmoduleID;
6281 }
6282 
6283 void ASTWriter::IdentifierRead(IdentID ID, IdentifierInfo *II) {
6284   // Always keep the highest ID. See \p TypeRead() for more information.
6285   IdentID &StoredID = IdentifierIDs[II];
6286   if (ID > StoredID)
6287     StoredID = ID;
6288 }
6289 
6290 void ASTWriter::MacroRead(serialization::MacroID ID, MacroInfo *MI) {
6291   // Always keep the highest ID. See \p TypeRead() for more information.
6292   MacroID &StoredID = MacroIDs[MI];
6293   if (ID > StoredID)
6294     StoredID = ID;
6295 }
6296 
6297 void ASTWriter::TypeRead(TypeIdx Idx, QualType T) {
6298   // Always take the highest-numbered type index. This copes with an interesting
6299   // case for chained AST writing where we schedule writing the type and then,
6300   // later, deserialize the type from another AST. In this case, we want to
6301   // keep the higher-numbered entry so that we can properly write it out to
6302   // the AST file.
6303   TypeIdx &StoredIdx = TypeIdxs[T];
6304   if (Idx.getIndex() >= StoredIdx.getIndex())
6305     StoredIdx = Idx;
6306 }
6307 
6308 void ASTWriter::SelectorRead(SelectorID ID, Selector S) {
6309   // Always keep the highest ID. See \p TypeRead() for more information.
6310   SelectorID &StoredID = SelectorIDs[S];
6311   if (ID > StoredID)
6312     StoredID = ID;
6313 }
6314 
6315 void ASTWriter::MacroDefinitionRead(serialization::PreprocessedEntityID ID,
6316                                     MacroDefinitionRecord *MD) {
6317   assert(MacroDefinitions.find(MD) == MacroDefinitions.end());
6318   MacroDefinitions[MD] = ID;
6319 }
6320 
6321 void ASTWriter::ModuleRead(serialization::SubmoduleID ID, Module *Mod) {
6322   assert(SubmoduleIDs.find(Mod) == SubmoduleIDs.end());
6323   SubmoduleIDs[Mod] = ID;
6324 }
6325 
6326 void ASTWriter::CompletedTagDefinition(const TagDecl *D) {
6327   if (Chain && Chain->isProcessingUpdateRecords()) return;
6328   assert(D->isCompleteDefinition());
6329   assert(!WritingAST && "Already writing the AST!");
6330   if (auto *RD = dyn_cast<CXXRecordDecl>(D)) {
6331     // We are interested when a PCH decl is modified.
6332     if (RD->isFromASTFile()) {
6333       // A forward reference was mutated into a definition. Rewrite it.
6334       // FIXME: This happens during template instantiation, should we
6335       // have created a new definition decl instead ?
6336       assert(isTemplateInstantiation(RD->getTemplateSpecializationKind()) &&
6337              "completed a tag from another module but not by instantiation?");
6338       DeclUpdates[RD].push_back(
6339           DeclUpdate(UPD_CXX_INSTANTIATED_CLASS_DEFINITION));
6340     }
6341   }
6342 }
6343 
6344 static bool isImportedDeclContext(ASTReader *Chain, const Decl *D) {
6345   if (D->isFromASTFile())
6346     return true;
6347 
6348   // The predefined __va_list_tag struct is imported if we imported any decls.
6349   // FIXME: This is a gross hack.
6350   return D == D->getASTContext().getVaListTagDecl();
6351 }
6352 
6353 void ASTWriter::AddedVisibleDecl(const DeclContext *DC, const Decl *D) {
6354   if (Chain && Chain->isProcessingUpdateRecords()) return;
6355   assert(DC->isLookupContext() &&
6356           "Should not add lookup results to non-lookup contexts!");
6357 
6358   // TU is handled elsewhere.
6359   if (isa<TranslationUnitDecl>(DC))
6360     return;
6361 
6362   // Namespaces are handled elsewhere, except for template instantiations of
6363   // FunctionTemplateDecls in namespaces. We are interested in cases where the
6364   // local instantiations are added to an imported context. Only happens when
6365   // adding ADL lookup candidates, for example templated friends.
6366   if (isa<NamespaceDecl>(DC) && D->getFriendObjectKind() == Decl::FOK_None &&
6367       !isa<FunctionTemplateDecl>(D))
6368     return;
6369 
6370   // We're only interested in cases where a local declaration is added to an
6371   // imported context.
6372   if (D->isFromASTFile() || !isImportedDeclContext(Chain, cast<Decl>(DC)))
6373     return;
6374 
6375   assert(DC == DC->getPrimaryContext() && "added to non-primary context");
6376   assert(!getDefinitiveDeclContext(DC) && "DeclContext not definitive!");
6377   assert(!WritingAST && "Already writing the AST!");
6378   if (UpdatedDeclContexts.insert(DC) && !cast<Decl>(DC)->isFromASTFile()) {
6379     // We're adding a visible declaration to a predefined decl context. Ensure
6380     // that we write out all of its lookup results so we don't get a nasty
6381     // surprise when we try to emit its lookup table.
6382     for (auto *Child : DC->decls())
6383       DeclsToEmitEvenIfUnreferenced.push_back(Child);
6384   }
6385   DeclsToEmitEvenIfUnreferenced.push_back(D);
6386 }
6387 
6388 void ASTWriter::AddedCXXImplicitMember(const CXXRecordDecl *RD, const Decl *D) {
6389   if (Chain && Chain->isProcessingUpdateRecords()) return;
6390   assert(D->isImplicit());
6391 
6392   // We're only interested in cases where a local declaration is added to an
6393   // imported context.
6394   if (D->isFromASTFile() || !isImportedDeclContext(Chain, RD))
6395     return;
6396 
6397   if (!isa<CXXMethodDecl>(D))
6398     return;
6399 
6400   // A decl coming from PCH was modified.
6401   assert(RD->isCompleteDefinition());
6402   assert(!WritingAST && "Already writing the AST!");
6403   DeclUpdates[RD].push_back(DeclUpdate(UPD_CXX_ADDED_IMPLICIT_MEMBER, D));
6404 }
6405 
6406 void ASTWriter::ResolvedExceptionSpec(const FunctionDecl *FD) {
6407   if (Chain && Chain->isProcessingUpdateRecords()) return;
6408   assert(!DoneWritingDeclsAndTypes && "Already done writing updates!");
6409   if (!Chain) return;
6410   Chain->forEachImportedKeyDecl(FD, [&](const Decl *D) {
6411     // If we don't already know the exception specification for this redecl
6412     // chain, add an update record for it.
6413     if (isUnresolvedExceptionSpec(cast<FunctionDecl>(D)
6414                                       ->getType()
6415                                       ->castAs<FunctionProtoType>()
6416                                       ->getExceptionSpecType()))
6417       DeclUpdates[D].push_back(UPD_CXX_RESOLVED_EXCEPTION_SPEC);
6418   });
6419 }
6420 
6421 void ASTWriter::DeducedReturnType(const FunctionDecl *FD, QualType ReturnType) {
6422   if (Chain && Chain->isProcessingUpdateRecords()) return;
6423   assert(!WritingAST && "Already writing the AST!");
6424   if (!Chain) return;
6425   Chain->forEachImportedKeyDecl(FD, [&](const Decl *D) {
6426     DeclUpdates[D].push_back(
6427         DeclUpdate(UPD_CXX_DEDUCED_RETURN_TYPE, ReturnType));
6428   });
6429 }
6430 
6431 void ASTWriter::ResolvedOperatorDelete(const CXXDestructorDecl *DD,
6432                                        const FunctionDecl *Delete,
6433                                        Expr *ThisArg) {
6434   if (Chain && Chain->isProcessingUpdateRecords()) return;
6435   assert(!WritingAST && "Already writing the AST!");
6436   assert(Delete && "Not given an operator delete");
6437   if (!Chain) return;
6438   Chain->forEachImportedKeyDecl(DD, [&](const Decl *D) {
6439     DeclUpdates[D].push_back(DeclUpdate(UPD_CXX_RESOLVED_DTOR_DELETE, Delete));
6440   });
6441 }
6442 
6443 void ASTWriter::CompletedImplicitDefinition(const FunctionDecl *D) {
6444   if (Chain && Chain->isProcessingUpdateRecords()) return;
6445   assert(!WritingAST && "Already writing the AST!");
6446   if (!D->isFromASTFile())
6447     return; // Declaration not imported from PCH.
6448 
6449   // Implicit function decl from a PCH was defined.
6450   DeclUpdates[D].push_back(DeclUpdate(UPD_CXX_ADDED_FUNCTION_DEFINITION));
6451 }
6452 
6453 void ASTWriter::VariableDefinitionInstantiated(const VarDecl *D) {
6454   if (Chain && Chain->isProcessingUpdateRecords()) return;
6455   assert(!WritingAST && "Already writing the AST!");
6456   if (!D->isFromASTFile())
6457     return;
6458 
6459   DeclUpdates[D].push_back(DeclUpdate(UPD_CXX_ADDED_VAR_DEFINITION));
6460 }
6461 
6462 void ASTWriter::FunctionDefinitionInstantiated(const FunctionDecl *D) {
6463   if (Chain && Chain->isProcessingUpdateRecords()) return;
6464   assert(!WritingAST && "Already writing the AST!");
6465   if (!D->isFromASTFile())
6466     return;
6467 
6468   DeclUpdates[D].push_back(DeclUpdate(UPD_CXX_ADDED_FUNCTION_DEFINITION));
6469 }
6470 
6471 void ASTWriter::InstantiationRequested(const ValueDecl *D) {
6472   if (Chain && Chain->isProcessingUpdateRecords()) return;
6473   assert(!WritingAST && "Already writing the AST!");
6474   if (!D->isFromASTFile())
6475     return;
6476 
6477   // Since the actual instantiation is delayed, this really means that we need
6478   // to update the instantiation location.
6479   SourceLocation POI;
6480   if (auto *VD = dyn_cast<VarDecl>(D))
6481     POI = VD->getPointOfInstantiation();
6482   else
6483     POI = cast<FunctionDecl>(D)->getPointOfInstantiation();
6484   DeclUpdates[D].push_back(DeclUpdate(UPD_CXX_POINT_OF_INSTANTIATION, POI));
6485 }
6486 
6487 void ASTWriter::DefaultArgumentInstantiated(const ParmVarDecl *D) {
6488   if (Chain && Chain->isProcessingUpdateRecords()) return;
6489   assert(!WritingAST && "Already writing the AST!");
6490   if (!D->isFromASTFile())
6491     return;
6492 
6493   DeclUpdates[D].push_back(
6494       DeclUpdate(UPD_CXX_INSTANTIATED_DEFAULT_ARGUMENT, D));
6495 }
6496 
6497 void ASTWriter::DefaultMemberInitializerInstantiated(const FieldDecl *D) {
6498   assert(!WritingAST && "Already writing the AST!");
6499   if (!D->isFromASTFile())
6500     return;
6501 
6502   DeclUpdates[D].push_back(
6503       DeclUpdate(UPD_CXX_INSTANTIATED_DEFAULT_MEMBER_INITIALIZER, D));
6504 }
6505 
6506 void ASTWriter::AddedObjCCategoryToInterface(const ObjCCategoryDecl *CatD,
6507                                              const ObjCInterfaceDecl *IFD) {
6508   if (Chain && Chain->isProcessingUpdateRecords()) return;
6509   assert(!WritingAST && "Already writing the AST!");
6510   if (!IFD->isFromASTFile())
6511     return; // Declaration not imported from PCH.
6512 
6513   assert(IFD->getDefinition() && "Category on a class without a definition?");
6514   ObjCClassesWithCategories.insert(
6515     const_cast<ObjCInterfaceDecl *>(IFD->getDefinition()));
6516 }
6517 
6518 void ASTWriter::DeclarationMarkedUsed(const Decl *D) {
6519   if (Chain && Chain->isProcessingUpdateRecords()) return;
6520   assert(!WritingAST && "Already writing the AST!");
6521 
6522   // If there is *any* declaration of the entity that's not from an AST file,
6523   // we can skip writing the update record. We make sure that isUsed() triggers
6524   // completion of the redeclaration chain of the entity.
6525   for (auto Prev = D->getMostRecentDecl(); Prev; Prev = Prev->getPreviousDecl())
6526     if (IsLocalDecl(Prev))
6527       return;
6528 
6529   DeclUpdates[D].push_back(DeclUpdate(UPD_DECL_MARKED_USED));
6530 }
6531 
6532 void ASTWriter::DeclarationMarkedOpenMPThreadPrivate(const Decl *D) {
6533   if (Chain && Chain->isProcessingUpdateRecords()) return;
6534   assert(!WritingAST && "Already writing the AST!");
6535   if (!D->isFromASTFile())
6536     return;
6537 
6538   DeclUpdates[D].push_back(DeclUpdate(UPD_DECL_MARKED_OPENMP_THREADPRIVATE));
6539 }
6540 
6541 void ASTWriter::DeclarationMarkedOpenMPAllocate(const Decl *D, const Attr *A) {
6542   if (Chain && Chain->isProcessingUpdateRecords()) return;
6543   assert(!WritingAST && "Already writing the AST!");
6544   if (!D->isFromASTFile())
6545     return;
6546 
6547   DeclUpdates[D].push_back(DeclUpdate(UPD_DECL_MARKED_OPENMP_ALLOCATE, A));
6548 }
6549 
6550 void ASTWriter::DeclarationMarkedOpenMPDeclareTarget(const Decl *D,
6551                                                      const Attr *Attr) {
6552   if (Chain && Chain->isProcessingUpdateRecords()) return;
6553   assert(!WritingAST && "Already writing the AST!");
6554   if (!D->isFromASTFile())
6555     return;
6556 
6557   DeclUpdates[D].push_back(
6558       DeclUpdate(UPD_DECL_MARKED_OPENMP_DECLARETARGET, Attr));
6559 }
6560 
6561 void ASTWriter::RedefinedHiddenDefinition(const NamedDecl *D, Module *M) {
6562   if (Chain && Chain->isProcessingUpdateRecords()) return;
6563   assert(!WritingAST && "Already writing the AST!");
6564   assert(D->isHidden() && "expected a hidden declaration");
6565   DeclUpdates[D].push_back(DeclUpdate(UPD_DECL_EXPORTED, M));
6566 }
6567 
6568 void ASTWriter::AddedAttributeToRecord(const Attr *Attr,
6569                                        const RecordDecl *Record) {
6570   if (Chain && Chain->isProcessingUpdateRecords()) return;
6571   assert(!WritingAST && "Already writing the AST!");
6572   if (!Record->isFromASTFile())
6573     return;
6574   DeclUpdates[Record].push_back(DeclUpdate(UPD_ADDED_ATTR_TO_RECORD, Attr));
6575 }
6576 
6577 void ASTWriter::AddedCXXTemplateSpecialization(
6578     const ClassTemplateDecl *TD, const ClassTemplateSpecializationDecl *D) {
6579   assert(!WritingAST && "Already writing the AST!");
6580 
6581   if (!TD->getFirstDecl()->isFromASTFile())
6582     return;
6583   if (Chain && Chain->isProcessingUpdateRecords())
6584     return;
6585 
6586   DeclsToEmitEvenIfUnreferenced.push_back(D);
6587 }
6588 
6589 void ASTWriter::AddedCXXTemplateSpecialization(
6590     const VarTemplateDecl *TD, const VarTemplateSpecializationDecl *D) {
6591   assert(!WritingAST && "Already writing the AST!");
6592 
6593   if (!TD->getFirstDecl()->isFromASTFile())
6594     return;
6595   if (Chain && Chain->isProcessingUpdateRecords())
6596     return;
6597 
6598   DeclsToEmitEvenIfUnreferenced.push_back(D);
6599 }
6600 
6601 void ASTWriter::AddedCXXTemplateSpecialization(const FunctionTemplateDecl *TD,
6602                                                const FunctionDecl *D) {
6603   assert(!WritingAST && "Already writing the AST!");
6604 
6605   if (!TD->getFirstDecl()->isFromASTFile())
6606     return;
6607   if (Chain && Chain->isProcessingUpdateRecords())
6608     return;
6609 
6610   DeclsToEmitEvenIfUnreferenced.push_back(D);
6611 }
6612 
6613 //===----------------------------------------------------------------------===//
6614 //// OMPClause Serialization
6615 ////===----------------------------------------------------------------------===//
6616 
6617 void OMPClauseWriter::writeClause(OMPClause *C) {
6618   Record.push_back(C->getClauseKind());
6619   Visit(C);
6620   Record.AddSourceLocation(C->getBeginLoc());
6621   Record.AddSourceLocation(C->getEndLoc());
6622 }
6623 
6624 void OMPClauseWriter::VisitOMPClauseWithPreInit(OMPClauseWithPreInit *C) {
6625   Record.push_back(C->getCaptureRegion());
6626   Record.AddStmt(C->getPreInitStmt());
6627 }
6628 
6629 void OMPClauseWriter::VisitOMPClauseWithPostUpdate(OMPClauseWithPostUpdate *C) {
6630   VisitOMPClauseWithPreInit(C);
6631   Record.AddStmt(C->getPostUpdateExpr());
6632 }
6633 
6634 void OMPClauseWriter::VisitOMPIfClause(OMPIfClause *C) {
6635   VisitOMPClauseWithPreInit(C);
6636   Record.push_back(C->getNameModifier());
6637   Record.AddSourceLocation(C->getNameModifierLoc());
6638   Record.AddSourceLocation(C->getColonLoc());
6639   Record.AddStmt(C->getCondition());
6640   Record.AddSourceLocation(C->getLParenLoc());
6641 }
6642 
6643 void OMPClauseWriter::VisitOMPFinalClause(OMPFinalClause *C) {
6644   VisitOMPClauseWithPreInit(C);
6645   Record.AddStmt(C->getCondition());
6646   Record.AddSourceLocation(C->getLParenLoc());
6647 }
6648 
6649 void OMPClauseWriter::VisitOMPNumThreadsClause(OMPNumThreadsClause *C) {
6650   VisitOMPClauseWithPreInit(C);
6651   Record.AddStmt(C->getNumThreads());
6652   Record.AddSourceLocation(C->getLParenLoc());
6653 }
6654 
6655 void OMPClauseWriter::VisitOMPSafelenClause(OMPSafelenClause *C) {
6656   Record.AddStmt(C->getSafelen());
6657   Record.AddSourceLocation(C->getLParenLoc());
6658 }
6659 
6660 void OMPClauseWriter::VisitOMPSimdlenClause(OMPSimdlenClause *C) {
6661   Record.AddStmt(C->getSimdlen());
6662   Record.AddSourceLocation(C->getLParenLoc());
6663 }
6664 
6665 void OMPClauseWriter::VisitOMPAllocatorClause(OMPAllocatorClause *C) {
6666   Record.AddStmt(C->getAllocator());
6667   Record.AddSourceLocation(C->getLParenLoc());
6668 }
6669 
6670 void OMPClauseWriter::VisitOMPCollapseClause(OMPCollapseClause *C) {
6671   Record.AddStmt(C->getNumForLoops());
6672   Record.AddSourceLocation(C->getLParenLoc());
6673 }
6674 
6675 void OMPClauseWriter::VisitOMPDefaultClause(OMPDefaultClause *C) {
6676   Record.push_back(C->getDefaultKind());
6677   Record.AddSourceLocation(C->getLParenLoc());
6678   Record.AddSourceLocation(C->getDefaultKindKwLoc());
6679 }
6680 
6681 void OMPClauseWriter::VisitOMPProcBindClause(OMPProcBindClause *C) {
6682   Record.push_back(C->getProcBindKind());
6683   Record.AddSourceLocation(C->getLParenLoc());
6684   Record.AddSourceLocation(C->getProcBindKindKwLoc());
6685 }
6686 
6687 void OMPClauseWriter::VisitOMPScheduleClause(OMPScheduleClause *C) {
6688   VisitOMPClauseWithPreInit(C);
6689   Record.push_back(C->getScheduleKind());
6690   Record.push_back(C->getFirstScheduleModifier());
6691   Record.push_back(C->getSecondScheduleModifier());
6692   Record.AddStmt(C->getChunkSize());
6693   Record.AddSourceLocation(C->getLParenLoc());
6694   Record.AddSourceLocation(C->getFirstScheduleModifierLoc());
6695   Record.AddSourceLocation(C->getSecondScheduleModifierLoc());
6696   Record.AddSourceLocation(C->getScheduleKindLoc());
6697   Record.AddSourceLocation(C->getCommaLoc());
6698 }
6699 
6700 void OMPClauseWriter::VisitOMPOrderedClause(OMPOrderedClause *C) {
6701   Record.push_back(C->getLoopNumIterations().size());
6702   Record.AddStmt(C->getNumForLoops());
6703   for (Expr *NumIter : C->getLoopNumIterations())
6704     Record.AddStmt(NumIter);
6705   for (unsigned I = 0, E = C->getLoopNumIterations().size(); I <E; ++I)
6706     Record.AddStmt(C->getLoopCounter(I));
6707   Record.AddSourceLocation(C->getLParenLoc());
6708 }
6709 
6710 void OMPClauseWriter::VisitOMPNowaitClause(OMPNowaitClause *) {}
6711 
6712 void OMPClauseWriter::VisitOMPUntiedClause(OMPUntiedClause *) {}
6713 
6714 void OMPClauseWriter::VisitOMPMergeableClause(OMPMergeableClause *) {}
6715 
6716 void OMPClauseWriter::VisitOMPReadClause(OMPReadClause *) {}
6717 
6718 void OMPClauseWriter::VisitOMPWriteClause(OMPWriteClause *) {}
6719 
6720 void OMPClauseWriter::VisitOMPUpdateClause(OMPUpdateClause *) {}
6721 
6722 void OMPClauseWriter::VisitOMPCaptureClause(OMPCaptureClause *) {}
6723 
6724 void OMPClauseWriter::VisitOMPSeqCstClause(OMPSeqCstClause *) {}
6725 
6726 void OMPClauseWriter::VisitOMPThreadsClause(OMPThreadsClause *) {}
6727 
6728 void OMPClauseWriter::VisitOMPSIMDClause(OMPSIMDClause *) {}
6729 
6730 void OMPClauseWriter::VisitOMPNogroupClause(OMPNogroupClause *) {}
6731 
6732 void OMPClauseWriter::VisitOMPPrivateClause(OMPPrivateClause *C) {
6733   Record.push_back(C->varlist_size());
6734   Record.AddSourceLocation(C->getLParenLoc());
6735   for (auto *VE : C->varlists()) {
6736     Record.AddStmt(VE);
6737   }
6738   for (auto *VE : C->private_copies()) {
6739     Record.AddStmt(VE);
6740   }
6741 }
6742 
6743 void OMPClauseWriter::VisitOMPFirstprivateClause(OMPFirstprivateClause *C) {
6744   Record.push_back(C->varlist_size());
6745   VisitOMPClauseWithPreInit(C);
6746   Record.AddSourceLocation(C->getLParenLoc());
6747   for (auto *VE : C->varlists()) {
6748     Record.AddStmt(VE);
6749   }
6750   for (auto *VE : C->private_copies()) {
6751     Record.AddStmt(VE);
6752   }
6753   for (auto *VE : C->inits()) {
6754     Record.AddStmt(VE);
6755   }
6756 }
6757 
6758 void OMPClauseWriter::VisitOMPLastprivateClause(OMPLastprivateClause *C) {
6759   Record.push_back(C->varlist_size());
6760   VisitOMPClauseWithPostUpdate(C);
6761   Record.AddSourceLocation(C->getLParenLoc());
6762   for (auto *VE : C->varlists())
6763     Record.AddStmt(VE);
6764   for (auto *E : C->private_copies())
6765     Record.AddStmt(E);
6766   for (auto *E : C->source_exprs())
6767     Record.AddStmt(E);
6768   for (auto *E : C->destination_exprs())
6769     Record.AddStmt(E);
6770   for (auto *E : C->assignment_ops())
6771     Record.AddStmt(E);
6772 }
6773 
6774 void OMPClauseWriter::VisitOMPSharedClause(OMPSharedClause *C) {
6775   Record.push_back(C->varlist_size());
6776   Record.AddSourceLocation(C->getLParenLoc());
6777   for (auto *VE : C->varlists())
6778     Record.AddStmt(VE);
6779 }
6780 
6781 void OMPClauseWriter::VisitOMPReductionClause(OMPReductionClause *C) {
6782   Record.push_back(C->varlist_size());
6783   VisitOMPClauseWithPostUpdate(C);
6784   Record.AddSourceLocation(C->getLParenLoc());
6785   Record.AddSourceLocation(C->getColonLoc());
6786   Record.AddNestedNameSpecifierLoc(C->getQualifierLoc());
6787   Record.AddDeclarationNameInfo(C->getNameInfo());
6788   for (auto *VE : C->varlists())
6789     Record.AddStmt(VE);
6790   for (auto *VE : C->privates())
6791     Record.AddStmt(VE);
6792   for (auto *E : C->lhs_exprs())
6793     Record.AddStmt(E);
6794   for (auto *E : C->rhs_exprs())
6795     Record.AddStmt(E);
6796   for (auto *E : C->reduction_ops())
6797     Record.AddStmt(E);
6798 }
6799 
6800 void OMPClauseWriter::VisitOMPTaskReductionClause(OMPTaskReductionClause *C) {
6801   Record.push_back(C->varlist_size());
6802   VisitOMPClauseWithPostUpdate(C);
6803   Record.AddSourceLocation(C->getLParenLoc());
6804   Record.AddSourceLocation(C->getColonLoc());
6805   Record.AddNestedNameSpecifierLoc(C->getQualifierLoc());
6806   Record.AddDeclarationNameInfo(C->getNameInfo());
6807   for (auto *VE : C->varlists())
6808     Record.AddStmt(VE);
6809   for (auto *VE : C->privates())
6810     Record.AddStmt(VE);
6811   for (auto *E : C->lhs_exprs())
6812     Record.AddStmt(E);
6813   for (auto *E : C->rhs_exprs())
6814     Record.AddStmt(E);
6815   for (auto *E : C->reduction_ops())
6816     Record.AddStmt(E);
6817 }
6818 
6819 void OMPClauseWriter::VisitOMPInReductionClause(OMPInReductionClause *C) {
6820   Record.push_back(C->varlist_size());
6821   VisitOMPClauseWithPostUpdate(C);
6822   Record.AddSourceLocation(C->getLParenLoc());
6823   Record.AddSourceLocation(C->getColonLoc());
6824   Record.AddNestedNameSpecifierLoc(C->getQualifierLoc());
6825   Record.AddDeclarationNameInfo(C->getNameInfo());
6826   for (auto *VE : C->varlists())
6827     Record.AddStmt(VE);
6828   for (auto *VE : C->privates())
6829     Record.AddStmt(VE);
6830   for (auto *E : C->lhs_exprs())
6831     Record.AddStmt(E);
6832   for (auto *E : C->rhs_exprs())
6833     Record.AddStmt(E);
6834   for (auto *E : C->reduction_ops())
6835     Record.AddStmt(E);
6836   for (auto *E : C->taskgroup_descriptors())
6837     Record.AddStmt(E);
6838 }
6839 
6840 void OMPClauseWriter::VisitOMPLinearClause(OMPLinearClause *C) {
6841   Record.push_back(C->varlist_size());
6842   VisitOMPClauseWithPostUpdate(C);
6843   Record.AddSourceLocation(C->getLParenLoc());
6844   Record.AddSourceLocation(C->getColonLoc());
6845   Record.push_back(C->getModifier());
6846   Record.AddSourceLocation(C->getModifierLoc());
6847   for (auto *VE : C->varlists()) {
6848     Record.AddStmt(VE);
6849   }
6850   for (auto *VE : C->privates()) {
6851     Record.AddStmt(VE);
6852   }
6853   for (auto *VE : C->inits()) {
6854     Record.AddStmt(VE);
6855   }
6856   for (auto *VE : C->updates()) {
6857     Record.AddStmt(VE);
6858   }
6859   for (auto *VE : C->finals()) {
6860     Record.AddStmt(VE);
6861   }
6862   Record.AddStmt(C->getStep());
6863   Record.AddStmt(C->getCalcStep());
6864   for (auto *VE : C->used_expressions())
6865     Record.AddStmt(VE);
6866 }
6867 
6868 void OMPClauseWriter::VisitOMPAlignedClause(OMPAlignedClause *C) {
6869   Record.push_back(C->varlist_size());
6870   Record.AddSourceLocation(C->getLParenLoc());
6871   Record.AddSourceLocation(C->getColonLoc());
6872   for (auto *VE : C->varlists())
6873     Record.AddStmt(VE);
6874   Record.AddStmt(C->getAlignment());
6875 }
6876 
6877 void OMPClauseWriter::VisitOMPCopyinClause(OMPCopyinClause *C) {
6878   Record.push_back(C->varlist_size());
6879   Record.AddSourceLocation(C->getLParenLoc());
6880   for (auto *VE : C->varlists())
6881     Record.AddStmt(VE);
6882   for (auto *E : C->source_exprs())
6883     Record.AddStmt(E);
6884   for (auto *E : C->destination_exprs())
6885     Record.AddStmt(E);
6886   for (auto *E : C->assignment_ops())
6887     Record.AddStmt(E);
6888 }
6889 
6890 void OMPClauseWriter::VisitOMPCopyprivateClause(OMPCopyprivateClause *C) {
6891   Record.push_back(C->varlist_size());
6892   Record.AddSourceLocation(C->getLParenLoc());
6893   for (auto *VE : C->varlists())
6894     Record.AddStmt(VE);
6895   for (auto *E : C->source_exprs())
6896     Record.AddStmt(E);
6897   for (auto *E : C->destination_exprs())
6898     Record.AddStmt(E);
6899   for (auto *E : C->assignment_ops())
6900     Record.AddStmt(E);
6901 }
6902 
6903 void OMPClauseWriter::VisitOMPFlushClause(OMPFlushClause *C) {
6904   Record.push_back(C->varlist_size());
6905   Record.AddSourceLocation(C->getLParenLoc());
6906   for (auto *VE : C->varlists())
6907     Record.AddStmt(VE);
6908 }
6909 
6910 void OMPClauseWriter::VisitOMPDependClause(OMPDependClause *C) {
6911   Record.push_back(C->varlist_size());
6912   Record.push_back(C->getNumLoops());
6913   Record.AddSourceLocation(C->getLParenLoc());
6914   Record.push_back(C->getDependencyKind());
6915   Record.AddSourceLocation(C->getDependencyLoc());
6916   Record.AddSourceLocation(C->getColonLoc());
6917   for (auto *VE : C->varlists())
6918     Record.AddStmt(VE);
6919   for (unsigned I = 0, E = C->getNumLoops(); I < E; ++I)
6920     Record.AddStmt(C->getLoopData(I));
6921 }
6922 
6923 void OMPClauseWriter::VisitOMPDeviceClause(OMPDeviceClause *C) {
6924   VisitOMPClauseWithPreInit(C);
6925   Record.AddStmt(C->getDevice());
6926   Record.AddSourceLocation(C->getLParenLoc());
6927 }
6928 
6929 void OMPClauseWriter::VisitOMPMapClause(OMPMapClause *C) {
6930   Record.push_back(C->varlist_size());
6931   Record.push_back(C->getUniqueDeclarationsNum());
6932   Record.push_back(C->getTotalComponentListNum());
6933   Record.push_back(C->getTotalComponentsNum());
6934   Record.AddSourceLocation(C->getLParenLoc());
6935   for (unsigned I = 0; I < OMPMapClause::NumberOfModifiers; ++I) {
6936     Record.push_back(C->getMapTypeModifier(I));
6937     Record.AddSourceLocation(C->getMapTypeModifierLoc(I));
6938   }
6939   Record.AddNestedNameSpecifierLoc(C->getMapperQualifierLoc());
6940   Record.AddDeclarationNameInfo(C->getMapperIdInfo());
6941   Record.push_back(C->getMapType());
6942   Record.AddSourceLocation(C->getMapLoc());
6943   Record.AddSourceLocation(C->getColonLoc());
6944   for (auto *E : C->varlists())
6945     Record.AddStmt(E);
6946   for (auto *E : C->mapperlists())
6947     Record.AddStmt(E);
6948   for (auto *D : C->all_decls())
6949     Record.AddDeclRef(D);
6950   for (auto N : C->all_num_lists())
6951     Record.push_back(N);
6952   for (auto N : C->all_lists_sizes())
6953     Record.push_back(N);
6954   for (auto &M : C->all_components()) {
6955     Record.AddStmt(M.getAssociatedExpression());
6956     Record.AddDeclRef(M.getAssociatedDeclaration());
6957   }
6958 }
6959 
6960 void OMPClauseWriter::VisitOMPAllocateClause(OMPAllocateClause *C) {
6961   Record.push_back(C->varlist_size());
6962   Record.AddSourceLocation(C->getLParenLoc());
6963   Record.AddSourceLocation(C->getColonLoc());
6964   Record.AddStmt(C->getAllocator());
6965   for (auto *VE : C->varlists())
6966     Record.AddStmt(VE);
6967 }
6968 
6969 void OMPClauseWriter::VisitOMPNumTeamsClause(OMPNumTeamsClause *C) {
6970   VisitOMPClauseWithPreInit(C);
6971   Record.AddStmt(C->getNumTeams());
6972   Record.AddSourceLocation(C->getLParenLoc());
6973 }
6974 
6975 void OMPClauseWriter::VisitOMPThreadLimitClause(OMPThreadLimitClause *C) {
6976   VisitOMPClauseWithPreInit(C);
6977   Record.AddStmt(C->getThreadLimit());
6978   Record.AddSourceLocation(C->getLParenLoc());
6979 }
6980 
6981 void OMPClauseWriter::VisitOMPPriorityClause(OMPPriorityClause *C) {
6982   VisitOMPClauseWithPreInit(C);
6983   Record.AddStmt(C->getPriority());
6984   Record.AddSourceLocation(C->getLParenLoc());
6985 }
6986 
6987 void OMPClauseWriter::VisitOMPGrainsizeClause(OMPGrainsizeClause *C) {
6988   VisitOMPClauseWithPreInit(C);
6989   Record.AddStmt(C->getGrainsize());
6990   Record.AddSourceLocation(C->getLParenLoc());
6991 }
6992 
6993 void OMPClauseWriter::VisitOMPNumTasksClause(OMPNumTasksClause *C) {
6994   VisitOMPClauseWithPreInit(C);
6995   Record.AddStmt(C->getNumTasks());
6996   Record.AddSourceLocation(C->getLParenLoc());
6997 }
6998 
6999 void OMPClauseWriter::VisitOMPHintClause(OMPHintClause *C) {
7000   Record.AddStmt(C->getHint());
7001   Record.AddSourceLocation(C->getLParenLoc());
7002 }
7003 
7004 void OMPClauseWriter::VisitOMPDistScheduleClause(OMPDistScheduleClause *C) {
7005   VisitOMPClauseWithPreInit(C);
7006   Record.push_back(C->getDistScheduleKind());
7007   Record.AddStmt(C->getChunkSize());
7008   Record.AddSourceLocation(C->getLParenLoc());
7009   Record.AddSourceLocation(C->getDistScheduleKindLoc());
7010   Record.AddSourceLocation(C->getCommaLoc());
7011 }
7012 
7013 void OMPClauseWriter::VisitOMPDefaultmapClause(OMPDefaultmapClause *C) {
7014   Record.push_back(C->getDefaultmapKind());
7015   Record.push_back(C->getDefaultmapModifier());
7016   Record.AddSourceLocation(C->getLParenLoc());
7017   Record.AddSourceLocation(C->getDefaultmapModifierLoc());
7018   Record.AddSourceLocation(C->getDefaultmapKindLoc());
7019 }
7020 
7021 void OMPClauseWriter::VisitOMPToClause(OMPToClause *C) {
7022   Record.push_back(C->varlist_size());
7023   Record.push_back(C->getUniqueDeclarationsNum());
7024   Record.push_back(C->getTotalComponentListNum());
7025   Record.push_back(C->getTotalComponentsNum());
7026   Record.AddSourceLocation(C->getLParenLoc());
7027   Record.AddNestedNameSpecifierLoc(C->getMapperQualifierLoc());
7028   Record.AddDeclarationNameInfo(C->getMapperIdInfo());
7029   for (auto *E : C->varlists())
7030     Record.AddStmt(E);
7031   for (auto *E : C->mapperlists())
7032     Record.AddStmt(E);
7033   for (auto *D : C->all_decls())
7034     Record.AddDeclRef(D);
7035   for (auto N : C->all_num_lists())
7036     Record.push_back(N);
7037   for (auto N : C->all_lists_sizes())
7038     Record.push_back(N);
7039   for (auto &M : C->all_components()) {
7040     Record.AddStmt(M.getAssociatedExpression());
7041     Record.AddDeclRef(M.getAssociatedDeclaration());
7042   }
7043 }
7044 
7045 void OMPClauseWriter::VisitOMPFromClause(OMPFromClause *C) {
7046   Record.push_back(C->varlist_size());
7047   Record.push_back(C->getUniqueDeclarationsNum());
7048   Record.push_back(C->getTotalComponentListNum());
7049   Record.push_back(C->getTotalComponentsNum());
7050   Record.AddSourceLocation(C->getLParenLoc());
7051   Record.AddNestedNameSpecifierLoc(C->getMapperQualifierLoc());
7052   Record.AddDeclarationNameInfo(C->getMapperIdInfo());
7053   for (auto *E : C->varlists())
7054     Record.AddStmt(E);
7055   for (auto *E : C->mapperlists())
7056     Record.AddStmt(E);
7057   for (auto *D : C->all_decls())
7058     Record.AddDeclRef(D);
7059   for (auto N : C->all_num_lists())
7060     Record.push_back(N);
7061   for (auto N : C->all_lists_sizes())
7062     Record.push_back(N);
7063   for (auto &M : C->all_components()) {
7064     Record.AddStmt(M.getAssociatedExpression());
7065     Record.AddDeclRef(M.getAssociatedDeclaration());
7066   }
7067 }
7068 
7069 void OMPClauseWriter::VisitOMPUseDevicePtrClause(OMPUseDevicePtrClause *C) {
7070   Record.push_back(C->varlist_size());
7071   Record.push_back(C->getUniqueDeclarationsNum());
7072   Record.push_back(C->getTotalComponentListNum());
7073   Record.push_back(C->getTotalComponentsNum());
7074   Record.AddSourceLocation(C->getLParenLoc());
7075   for (auto *E : C->varlists())
7076     Record.AddStmt(E);
7077   for (auto *VE : C->private_copies())
7078     Record.AddStmt(VE);
7079   for (auto *VE : C->inits())
7080     Record.AddStmt(VE);
7081   for (auto *D : C->all_decls())
7082     Record.AddDeclRef(D);
7083   for (auto N : C->all_num_lists())
7084     Record.push_back(N);
7085   for (auto N : C->all_lists_sizes())
7086     Record.push_back(N);
7087   for (auto &M : C->all_components()) {
7088     Record.AddStmt(M.getAssociatedExpression());
7089     Record.AddDeclRef(M.getAssociatedDeclaration());
7090   }
7091 }
7092 
7093 void OMPClauseWriter::VisitOMPIsDevicePtrClause(OMPIsDevicePtrClause *C) {
7094   Record.push_back(C->varlist_size());
7095   Record.push_back(C->getUniqueDeclarationsNum());
7096   Record.push_back(C->getTotalComponentListNum());
7097   Record.push_back(C->getTotalComponentsNum());
7098   Record.AddSourceLocation(C->getLParenLoc());
7099   for (auto *E : C->varlists())
7100     Record.AddStmt(E);
7101   for (auto *D : C->all_decls())
7102     Record.AddDeclRef(D);
7103   for (auto N : C->all_num_lists())
7104     Record.push_back(N);
7105   for (auto N : C->all_lists_sizes())
7106     Record.push_back(N);
7107   for (auto &M : C->all_components()) {
7108     Record.AddStmt(M.getAssociatedExpression());
7109     Record.AddDeclRef(M.getAssociatedDeclaration());
7110   }
7111 }
7112 
7113 void OMPClauseWriter::VisitOMPUnifiedAddressClause(OMPUnifiedAddressClause *) {}
7114 
7115 void OMPClauseWriter::VisitOMPUnifiedSharedMemoryClause(
7116     OMPUnifiedSharedMemoryClause *) {}
7117 
7118 void OMPClauseWriter::VisitOMPReverseOffloadClause(OMPReverseOffloadClause *) {}
7119 
7120 void
7121 OMPClauseWriter::VisitOMPDynamicAllocatorsClause(OMPDynamicAllocatorsClause *) {
7122 }
7123 
7124 void OMPClauseWriter::VisitOMPAtomicDefaultMemOrderClause(
7125     OMPAtomicDefaultMemOrderClause *C) {
7126   Record.push_back(C->getAtomicDefaultMemOrderKind());
7127   Record.AddSourceLocation(C->getLParenLoc());
7128   Record.AddSourceLocation(C->getAtomicDefaultMemOrderKindKwLoc());
7129 }
7130