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1 //===--- ASTWriter.cpp - AST File Writer ------------------------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 //  This file defines the ASTWriter class, which writes AST files.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "clang/Serialization/ASTWriter.h"
15 #include "clang/Serialization/ModuleFileExtension.h"
16 #include "ASTCommon.h"
17 #include "ASTReaderInternals.h"
18 #include "MultiOnDiskHashTable.h"
19 #include "clang/AST/ASTContext.h"
20 #include "clang/AST/Decl.h"
21 #include "clang/AST/DeclContextInternals.h"
22 #include "clang/AST/DeclFriend.h"
23 #include "clang/AST/DeclLookups.h"
24 #include "clang/AST/DeclTemplate.h"
25 #include "clang/AST/Expr.h"
26 #include "clang/AST/ExprCXX.h"
27 #include "clang/AST/Type.h"
28 #include "clang/AST/TypeLocVisitor.h"
29 #include "clang/Basic/DiagnosticOptions.h"
30 #include "clang/Basic/FileManager.h"
31 #include "clang/Basic/FileSystemStatCache.h"
32 #include "clang/Basic/SourceManager.h"
33 #include "clang/Basic/SourceManagerInternals.h"
34 #include "clang/Basic/TargetInfo.h"
35 #include "clang/Basic/TargetOptions.h"
36 #include "clang/Basic/Version.h"
37 #include "clang/Basic/VersionTuple.h"
38 #include "clang/Lex/HeaderSearch.h"
39 #include "clang/Lex/HeaderSearchOptions.h"
40 #include "clang/Lex/MacroInfo.h"
41 #include "clang/Lex/PreprocessingRecord.h"
42 #include "clang/Lex/Preprocessor.h"
43 #include "clang/Lex/PreprocessorOptions.h"
44 #include "clang/Sema/IdentifierResolver.h"
45 #include "clang/Sema/Sema.h"
46 #include "clang/Serialization/ASTReader.h"
47 #include "clang/Serialization/SerializationDiagnostic.h"
48 #include "llvm/ADT/APFloat.h"
49 #include "llvm/ADT/APInt.h"
50 #include "llvm/ADT/Hashing.h"
51 #include "llvm/ADT/StringExtras.h"
52 #include "llvm/Bitcode/BitstreamWriter.h"
53 #include "llvm/Support/Compression.h"
54 #include "llvm/Support/EndianStream.h"
55 #include "llvm/Support/FileSystem.h"
56 #include "llvm/Support/MemoryBuffer.h"
57 #include "llvm/Support/OnDiskHashTable.h"
58 #include "llvm/Support/Path.h"
59 #include "llvm/Support/Process.h"
60 #include <algorithm>
61 #include <cstdio>
62 #include <string.h>
63 #include <utility>
64 
65 using namespace clang;
66 using namespace clang::serialization;
67 
68 template <typename T, typename Allocator>
bytes(const std::vector<T,Allocator> & v)69 static StringRef bytes(const std::vector<T, Allocator> &v) {
70   if (v.empty()) return StringRef();
71   return StringRef(reinterpret_cast<const char*>(&v[0]),
72                          sizeof(T) * v.size());
73 }
74 
75 template <typename T>
bytes(const SmallVectorImpl<T> & v)76 static StringRef bytes(const SmallVectorImpl<T> &v) {
77   return StringRef(reinterpret_cast<const char*>(v.data()),
78                          sizeof(T) * v.size());
79 }
80 
81 //===----------------------------------------------------------------------===//
82 // Type serialization
83 //===----------------------------------------------------------------------===//
84 
85 namespace clang {
86   class ASTTypeWriter {
87     ASTWriter &Writer;
88     ASTRecordWriter Record;
89 
90     /// \brief Type code that corresponds to the record generated.
91     TypeCode Code;
92     /// \brief Abbreviation to use for the record, if any.
93     unsigned AbbrevToUse;
94 
95   public:
ASTTypeWriter(ASTWriter & Writer,ASTWriter::RecordDataImpl & Record)96     ASTTypeWriter(ASTWriter &Writer, ASTWriter::RecordDataImpl &Record)
97       : Writer(Writer), Record(Writer, Record), Code((TypeCode)0), AbbrevToUse(0) { }
98 
Emit()99     uint64_t Emit() {
100       return Record.Emit(Code, AbbrevToUse);
101     }
102 
Visit(QualType T)103     void Visit(QualType T) {
104       if (T.hasLocalNonFastQualifiers()) {
105         Qualifiers Qs = T.getLocalQualifiers();
106         Record.AddTypeRef(T.getLocalUnqualifiedType());
107         Record.push_back(Qs.getAsOpaqueValue());
108         Code = TYPE_EXT_QUAL;
109         AbbrevToUse = Writer.TypeExtQualAbbrev;
110       } else {
111         switch (T->getTypeClass()) {
112           // For all of the concrete, non-dependent types, call the
113           // appropriate visitor function.
114 #define TYPE(Class, Base) \
115         case Type::Class: Visit##Class##Type(cast<Class##Type>(T)); break;
116 #define ABSTRACT_TYPE(Class, Base)
117 #include "clang/AST/TypeNodes.def"
118         }
119       }
120     }
121 
122     void VisitArrayType(const ArrayType *T);
123     void VisitFunctionType(const FunctionType *T);
124     void VisitTagType(const TagType *T);
125 
126 #define TYPE(Class, Base) void Visit##Class##Type(const Class##Type *T);
127 #define ABSTRACT_TYPE(Class, Base)
128 #include "clang/AST/TypeNodes.def"
129   };
130 } // end namespace clang
131 
VisitBuiltinType(const BuiltinType * T)132 void ASTTypeWriter::VisitBuiltinType(const BuiltinType *T) {
133   llvm_unreachable("Built-in types are never serialized");
134 }
135 
VisitComplexType(const ComplexType * T)136 void ASTTypeWriter::VisitComplexType(const ComplexType *T) {
137   Record.AddTypeRef(T->getElementType());
138   Code = TYPE_COMPLEX;
139 }
140 
VisitPointerType(const PointerType * T)141 void ASTTypeWriter::VisitPointerType(const PointerType *T) {
142   Record.AddTypeRef(T->getPointeeType());
143   Code = TYPE_POINTER;
144 }
145 
VisitDecayedType(const DecayedType * T)146 void ASTTypeWriter::VisitDecayedType(const DecayedType *T) {
147   Record.AddTypeRef(T->getOriginalType());
148   Code = TYPE_DECAYED;
149 }
150 
VisitAdjustedType(const AdjustedType * T)151 void ASTTypeWriter::VisitAdjustedType(const AdjustedType *T) {
152   Record.AddTypeRef(T->getOriginalType());
153   Record.AddTypeRef(T->getAdjustedType());
154   Code = TYPE_ADJUSTED;
155 }
156 
VisitBlockPointerType(const BlockPointerType * T)157 void ASTTypeWriter::VisitBlockPointerType(const BlockPointerType *T) {
158   Record.AddTypeRef(T->getPointeeType());
159   Code = TYPE_BLOCK_POINTER;
160 }
161 
VisitLValueReferenceType(const LValueReferenceType * T)162 void ASTTypeWriter::VisitLValueReferenceType(const LValueReferenceType *T) {
163   Record.AddTypeRef(T->getPointeeTypeAsWritten());
164   Record.push_back(T->isSpelledAsLValue());
165   Code = TYPE_LVALUE_REFERENCE;
166 }
167 
VisitRValueReferenceType(const RValueReferenceType * T)168 void ASTTypeWriter::VisitRValueReferenceType(const RValueReferenceType *T) {
169   Record.AddTypeRef(T->getPointeeTypeAsWritten());
170   Code = TYPE_RVALUE_REFERENCE;
171 }
172 
VisitMemberPointerType(const MemberPointerType * T)173 void ASTTypeWriter::VisitMemberPointerType(const MemberPointerType *T) {
174   Record.AddTypeRef(T->getPointeeType());
175   Record.AddTypeRef(QualType(T->getClass(), 0));
176   Code = TYPE_MEMBER_POINTER;
177 }
178 
VisitArrayType(const ArrayType * T)179 void ASTTypeWriter::VisitArrayType(const ArrayType *T) {
180   Record.AddTypeRef(T->getElementType());
181   Record.push_back(T->getSizeModifier()); // FIXME: stable values
182   Record.push_back(T->getIndexTypeCVRQualifiers()); // FIXME: stable values
183 }
184 
VisitConstantArrayType(const ConstantArrayType * T)185 void ASTTypeWriter::VisitConstantArrayType(const ConstantArrayType *T) {
186   VisitArrayType(T);
187   Record.AddAPInt(T->getSize());
188   Code = TYPE_CONSTANT_ARRAY;
189 }
190 
VisitIncompleteArrayType(const IncompleteArrayType * T)191 void ASTTypeWriter::VisitIncompleteArrayType(const IncompleteArrayType *T) {
192   VisitArrayType(T);
193   Code = TYPE_INCOMPLETE_ARRAY;
194 }
195 
VisitVariableArrayType(const VariableArrayType * T)196 void ASTTypeWriter::VisitVariableArrayType(const VariableArrayType *T) {
197   VisitArrayType(T);
198   Record.AddSourceLocation(T->getLBracketLoc());
199   Record.AddSourceLocation(T->getRBracketLoc());
200   Record.AddStmt(T->getSizeExpr());
201   Code = TYPE_VARIABLE_ARRAY;
202 }
203 
VisitVectorType(const VectorType * T)204 void ASTTypeWriter::VisitVectorType(const VectorType *T) {
205   Record.AddTypeRef(T->getElementType());
206   Record.push_back(T->getNumElements());
207   Record.push_back(T->getVectorKind());
208   Code = TYPE_VECTOR;
209 }
210 
VisitExtVectorType(const ExtVectorType * T)211 void ASTTypeWriter::VisitExtVectorType(const ExtVectorType *T) {
212   VisitVectorType(T);
213   Code = TYPE_EXT_VECTOR;
214 }
215 
VisitFunctionType(const FunctionType * T)216 void ASTTypeWriter::VisitFunctionType(const FunctionType *T) {
217   Record.AddTypeRef(T->getReturnType());
218   FunctionType::ExtInfo C = T->getExtInfo();
219   Record.push_back(C.getNoReturn());
220   Record.push_back(C.getHasRegParm());
221   Record.push_back(C.getRegParm());
222   // FIXME: need to stabilize encoding of calling convention...
223   Record.push_back(C.getCC());
224   Record.push_back(C.getProducesResult());
225 
226   if (C.getHasRegParm() || C.getRegParm() || C.getProducesResult())
227     AbbrevToUse = 0;
228 }
229 
VisitFunctionNoProtoType(const FunctionNoProtoType * T)230 void ASTTypeWriter::VisitFunctionNoProtoType(const FunctionNoProtoType *T) {
231   VisitFunctionType(T);
232   Code = TYPE_FUNCTION_NO_PROTO;
233 }
234 
addExceptionSpec(const FunctionProtoType * T,ASTRecordWriter & Record)235 static void addExceptionSpec(const FunctionProtoType *T,
236                              ASTRecordWriter &Record) {
237   Record.push_back(T->getExceptionSpecType());
238   if (T->getExceptionSpecType() == EST_Dynamic) {
239     Record.push_back(T->getNumExceptions());
240     for (unsigned I = 0, N = T->getNumExceptions(); I != N; ++I)
241       Record.AddTypeRef(T->getExceptionType(I));
242   } else if (T->getExceptionSpecType() == EST_ComputedNoexcept) {
243     Record.AddStmt(T->getNoexceptExpr());
244   } else if (T->getExceptionSpecType() == EST_Uninstantiated) {
245     Record.AddDeclRef(T->getExceptionSpecDecl());
246     Record.AddDeclRef(T->getExceptionSpecTemplate());
247   } else if (T->getExceptionSpecType() == EST_Unevaluated) {
248     Record.AddDeclRef(T->getExceptionSpecDecl());
249   }
250 }
251 
VisitFunctionProtoType(const FunctionProtoType * T)252 void ASTTypeWriter::VisitFunctionProtoType(const FunctionProtoType *T) {
253   VisitFunctionType(T);
254 
255   Record.push_back(T->isVariadic());
256   Record.push_back(T->hasTrailingReturn());
257   Record.push_back(T->getTypeQuals());
258   Record.push_back(static_cast<unsigned>(T->getRefQualifier()));
259   addExceptionSpec(T, Record);
260 
261   Record.push_back(T->getNumParams());
262   for (unsigned I = 0, N = T->getNumParams(); I != N; ++I)
263     Record.AddTypeRef(T->getParamType(I));
264 
265   if (T->hasExtParameterInfos()) {
266     for (unsigned I = 0, N = T->getNumParams(); I != N; ++I)
267       Record.push_back(T->getExtParameterInfo(I).getOpaqueValue());
268   }
269 
270   if (T->isVariadic() || T->hasTrailingReturn() || T->getTypeQuals() ||
271       T->getRefQualifier() || T->getExceptionSpecType() != EST_None ||
272       T->hasExtParameterInfos())
273     AbbrevToUse = 0;
274 
275   Code = TYPE_FUNCTION_PROTO;
276 }
277 
VisitUnresolvedUsingType(const UnresolvedUsingType * T)278 void ASTTypeWriter::VisitUnresolvedUsingType(const UnresolvedUsingType *T) {
279   Record.AddDeclRef(T->getDecl());
280   Code = TYPE_UNRESOLVED_USING;
281 }
282 
VisitTypedefType(const TypedefType * T)283 void ASTTypeWriter::VisitTypedefType(const TypedefType *T) {
284   Record.AddDeclRef(T->getDecl());
285   assert(!T->isCanonicalUnqualified() && "Invalid typedef ?");
286   Record.AddTypeRef(T->getCanonicalTypeInternal());
287   Code = TYPE_TYPEDEF;
288 }
289 
VisitTypeOfExprType(const TypeOfExprType * T)290 void ASTTypeWriter::VisitTypeOfExprType(const TypeOfExprType *T) {
291   Record.AddStmt(T->getUnderlyingExpr());
292   Code = TYPE_TYPEOF_EXPR;
293 }
294 
VisitTypeOfType(const TypeOfType * T)295 void ASTTypeWriter::VisitTypeOfType(const TypeOfType *T) {
296   Record.AddTypeRef(T->getUnderlyingType());
297   Code = TYPE_TYPEOF;
298 }
299 
VisitDecltypeType(const DecltypeType * T)300 void ASTTypeWriter::VisitDecltypeType(const DecltypeType *T) {
301   Record.AddTypeRef(T->getUnderlyingType());
302   Record.AddStmt(T->getUnderlyingExpr());
303   Code = TYPE_DECLTYPE;
304 }
305 
VisitUnaryTransformType(const UnaryTransformType * T)306 void ASTTypeWriter::VisitUnaryTransformType(const UnaryTransformType *T) {
307   Record.AddTypeRef(T->getBaseType());
308   Record.AddTypeRef(T->getUnderlyingType());
309   Record.push_back(T->getUTTKind());
310   Code = TYPE_UNARY_TRANSFORM;
311 }
312 
VisitAutoType(const AutoType * T)313 void ASTTypeWriter::VisitAutoType(const AutoType *T) {
314   Record.AddTypeRef(T->getDeducedType());
315   Record.push_back((unsigned)T->getKeyword());
316   if (T->getDeducedType().isNull())
317     Record.push_back(T->isDependentType());
318   Code = TYPE_AUTO;
319 }
320 
VisitTagType(const TagType * T)321 void ASTTypeWriter::VisitTagType(const TagType *T) {
322   Record.push_back(T->isDependentType());
323   Record.AddDeclRef(T->getDecl()->getCanonicalDecl());
324   assert(!T->isBeingDefined() &&
325          "Cannot serialize in the middle of a type definition");
326 }
327 
VisitRecordType(const RecordType * T)328 void ASTTypeWriter::VisitRecordType(const RecordType *T) {
329   VisitTagType(T);
330   Code = TYPE_RECORD;
331 }
332 
VisitEnumType(const EnumType * T)333 void ASTTypeWriter::VisitEnumType(const EnumType *T) {
334   VisitTagType(T);
335   Code = TYPE_ENUM;
336 }
337 
VisitAttributedType(const AttributedType * T)338 void ASTTypeWriter::VisitAttributedType(const AttributedType *T) {
339   Record.AddTypeRef(T->getModifiedType());
340   Record.AddTypeRef(T->getEquivalentType());
341   Record.push_back(T->getAttrKind());
342   Code = TYPE_ATTRIBUTED;
343 }
344 
345 void
VisitSubstTemplateTypeParmType(const SubstTemplateTypeParmType * T)346 ASTTypeWriter::VisitSubstTemplateTypeParmType(
347                                         const SubstTemplateTypeParmType *T) {
348   Record.AddTypeRef(QualType(T->getReplacedParameter(), 0));
349   Record.AddTypeRef(T->getReplacementType());
350   Code = TYPE_SUBST_TEMPLATE_TYPE_PARM;
351 }
352 
353 void
VisitSubstTemplateTypeParmPackType(const SubstTemplateTypeParmPackType * T)354 ASTTypeWriter::VisitSubstTemplateTypeParmPackType(
355                                       const SubstTemplateTypeParmPackType *T) {
356   Record.AddTypeRef(QualType(T->getReplacedParameter(), 0));
357   Record.AddTemplateArgument(T->getArgumentPack());
358   Code = TYPE_SUBST_TEMPLATE_TYPE_PARM_PACK;
359 }
360 
361 void
VisitTemplateSpecializationType(const TemplateSpecializationType * T)362 ASTTypeWriter::VisitTemplateSpecializationType(
363                                        const TemplateSpecializationType *T) {
364   Record.push_back(T->isDependentType());
365   Record.AddTemplateName(T->getTemplateName());
366   Record.push_back(T->getNumArgs());
367   for (const auto &ArgI : *T)
368     Record.AddTemplateArgument(ArgI);
369   Record.AddTypeRef(T->isTypeAlias() ? T->getAliasedType()
370                                      : T->isCanonicalUnqualified()
371                                            ? QualType()
372                                            : T->getCanonicalTypeInternal());
373   Code = TYPE_TEMPLATE_SPECIALIZATION;
374 }
375 
376 void
VisitDependentSizedArrayType(const DependentSizedArrayType * T)377 ASTTypeWriter::VisitDependentSizedArrayType(const DependentSizedArrayType *T) {
378   VisitArrayType(T);
379   Record.AddStmt(T->getSizeExpr());
380   Record.AddSourceRange(T->getBracketsRange());
381   Code = TYPE_DEPENDENT_SIZED_ARRAY;
382 }
383 
384 void
VisitDependentSizedExtVectorType(const DependentSizedExtVectorType * T)385 ASTTypeWriter::VisitDependentSizedExtVectorType(
386                                         const DependentSizedExtVectorType *T) {
387   // FIXME: Serialize this type (C++ only)
388   llvm_unreachable("Cannot serialize dependent sized extended vector types");
389 }
390 
391 void
VisitTemplateTypeParmType(const TemplateTypeParmType * T)392 ASTTypeWriter::VisitTemplateTypeParmType(const TemplateTypeParmType *T) {
393   Record.push_back(T->getDepth());
394   Record.push_back(T->getIndex());
395   Record.push_back(T->isParameterPack());
396   Record.AddDeclRef(T->getDecl());
397   Code = TYPE_TEMPLATE_TYPE_PARM;
398 }
399 
400 void
VisitDependentNameType(const DependentNameType * T)401 ASTTypeWriter::VisitDependentNameType(const DependentNameType *T) {
402   Record.push_back(T->getKeyword());
403   Record.AddNestedNameSpecifier(T->getQualifier());
404   Record.AddIdentifierRef(T->getIdentifier());
405   Record.AddTypeRef(
406       T->isCanonicalUnqualified() ? QualType() : T->getCanonicalTypeInternal());
407   Code = TYPE_DEPENDENT_NAME;
408 }
409 
410 void
VisitDependentTemplateSpecializationType(const DependentTemplateSpecializationType * T)411 ASTTypeWriter::VisitDependentTemplateSpecializationType(
412                                 const DependentTemplateSpecializationType *T) {
413   Record.push_back(T->getKeyword());
414   Record.AddNestedNameSpecifier(T->getQualifier());
415   Record.AddIdentifierRef(T->getIdentifier());
416   Record.push_back(T->getNumArgs());
417   for (const auto &I : *T)
418     Record.AddTemplateArgument(I);
419   Code = TYPE_DEPENDENT_TEMPLATE_SPECIALIZATION;
420 }
421 
VisitPackExpansionType(const PackExpansionType * T)422 void ASTTypeWriter::VisitPackExpansionType(const PackExpansionType *T) {
423   Record.AddTypeRef(T->getPattern());
424   if (Optional<unsigned> NumExpansions = T->getNumExpansions())
425     Record.push_back(*NumExpansions + 1);
426   else
427     Record.push_back(0);
428   Code = TYPE_PACK_EXPANSION;
429 }
430 
VisitParenType(const ParenType * T)431 void ASTTypeWriter::VisitParenType(const ParenType *T) {
432   Record.AddTypeRef(T->getInnerType());
433   Code = TYPE_PAREN;
434 }
435 
VisitElaboratedType(const ElaboratedType * T)436 void ASTTypeWriter::VisitElaboratedType(const ElaboratedType *T) {
437   Record.push_back(T->getKeyword());
438   Record.AddNestedNameSpecifier(T->getQualifier());
439   Record.AddTypeRef(T->getNamedType());
440   Code = TYPE_ELABORATED;
441 }
442 
VisitInjectedClassNameType(const InjectedClassNameType * T)443 void ASTTypeWriter::VisitInjectedClassNameType(const InjectedClassNameType *T) {
444   Record.AddDeclRef(T->getDecl()->getCanonicalDecl());
445   Record.AddTypeRef(T->getInjectedSpecializationType());
446   Code = TYPE_INJECTED_CLASS_NAME;
447 }
448 
VisitObjCInterfaceType(const ObjCInterfaceType * T)449 void ASTTypeWriter::VisitObjCInterfaceType(const ObjCInterfaceType *T) {
450   Record.AddDeclRef(T->getDecl()->getCanonicalDecl());
451   Code = TYPE_OBJC_INTERFACE;
452 }
453 
VisitObjCObjectType(const ObjCObjectType * T)454 void ASTTypeWriter::VisitObjCObjectType(const ObjCObjectType *T) {
455   Record.AddTypeRef(T->getBaseType());
456   Record.push_back(T->getTypeArgsAsWritten().size());
457   for (auto TypeArg : T->getTypeArgsAsWritten())
458     Record.AddTypeRef(TypeArg);
459   Record.push_back(T->getNumProtocols());
460   for (const auto *I : T->quals())
461     Record.AddDeclRef(I);
462   Record.push_back(T->isKindOfTypeAsWritten());
463   Code = TYPE_OBJC_OBJECT;
464 }
465 
466 void
VisitObjCObjectPointerType(const ObjCObjectPointerType * T)467 ASTTypeWriter::VisitObjCObjectPointerType(const ObjCObjectPointerType *T) {
468   Record.AddTypeRef(T->getPointeeType());
469   Code = TYPE_OBJC_OBJECT_POINTER;
470 }
471 
472 void
VisitAtomicType(const AtomicType * T)473 ASTTypeWriter::VisitAtomicType(const AtomicType *T) {
474   Record.AddTypeRef(T->getValueType());
475   Code = TYPE_ATOMIC;
476 }
477 
478 void
VisitPipeType(const PipeType * T)479 ASTTypeWriter::VisitPipeType(const PipeType *T) {
480   Record.AddTypeRef(T->getElementType());
481   Code = TYPE_PIPE;
482 }
483 
484 namespace {
485 
486 class TypeLocWriter : public TypeLocVisitor<TypeLocWriter> {
487   ASTRecordWriter &Record;
488 
489 public:
TypeLocWriter(ASTRecordWriter & Record)490   TypeLocWriter(ASTRecordWriter &Record)
491     : Record(Record) { }
492 
493 #define ABSTRACT_TYPELOC(CLASS, PARENT)
494 #define TYPELOC(CLASS, PARENT) \
495     void Visit##CLASS##TypeLoc(CLASS##TypeLoc TyLoc);
496 #include "clang/AST/TypeLocNodes.def"
497 
498   void VisitArrayTypeLoc(ArrayTypeLoc TyLoc);
499   void VisitFunctionTypeLoc(FunctionTypeLoc TyLoc);
500 };
501 
502 } // end anonymous namespace
503 
VisitQualifiedTypeLoc(QualifiedTypeLoc TL)504 void TypeLocWriter::VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
505   // nothing to do
506 }
VisitBuiltinTypeLoc(BuiltinTypeLoc TL)507 void TypeLocWriter::VisitBuiltinTypeLoc(BuiltinTypeLoc TL) {
508   Record.AddSourceLocation(TL.getBuiltinLoc());
509   if (TL.needsExtraLocalData()) {
510     Record.push_back(TL.getWrittenTypeSpec());
511     Record.push_back(TL.getWrittenSignSpec());
512     Record.push_back(TL.getWrittenWidthSpec());
513     Record.push_back(TL.hasModeAttr());
514   }
515 }
VisitComplexTypeLoc(ComplexTypeLoc TL)516 void TypeLocWriter::VisitComplexTypeLoc(ComplexTypeLoc TL) {
517   Record.AddSourceLocation(TL.getNameLoc());
518 }
VisitPointerTypeLoc(PointerTypeLoc TL)519 void TypeLocWriter::VisitPointerTypeLoc(PointerTypeLoc TL) {
520   Record.AddSourceLocation(TL.getStarLoc());
521 }
VisitDecayedTypeLoc(DecayedTypeLoc TL)522 void TypeLocWriter::VisitDecayedTypeLoc(DecayedTypeLoc TL) {
523   // nothing to do
524 }
VisitAdjustedTypeLoc(AdjustedTypeLoc TL)525 void TypeLocWriter::VisitAdjustedTypeLoc(AdjustedTypeLoc TL) {
526   // nothing to do
527 }
VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL)528 void TypeLocWriter::VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) {
529   Record.AddSourceLocation(TL.getCaretLoc());
530 }
VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL)531 void TypeLocWriter::VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) {
532   Record.AddSourceLocation(TL.getAmpLoc());
533 }
VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL)534 void TypeLocWriter::VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) {
535   Record.AddSourceLocation(TL.getAmpAmpLoc());
536 }
VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL)537 void TypeLocWriter::VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) {
538   Record.AddSourceLocation(TL.getStarLoc());
539   Record.AddTypeSourceInfo(TL.getClassTInfo());
540 }
VisitArrayTypeLoc(ArrayTypeLoc TL)541 void TypeLocWriter::VisitArrayTypeLoc(ArrayTypeLoc TL) {
542   Record.AddSourceLocation(TL.getLBracketLoc());
543   Record.AddSourceLocation(TL.getRBracketLoc());
544   Record.push_back(TL.getSizeExpr() ? 1 : 0);
545   if (TL.getSizeExpr())
546     Record.AddStmt(TL.getSizeExpr());
547 }
VisitConstantArrayTypeLoc(ConstantArrayTypeLoc TL)548 void TypeLocWriter::VisitConstantArrayTypeLoc(ConstantArrayTypeLoc TL) {
549   VisitArrayTypeLoc(TL);
550 }
VisitIncompleteArrayTypeLoc(IncompleteArrayTypeLoc TL)551 void TypeLocWriter::VisitIncompleteArrayTypeLoc(IncompleteArrayTypeLoc TL) {
552   VisitArrayTypeLoc(TL);
553 }
VisitVariableArrayTypeLoc(VariableArrayTypeLoc TL)554 void TypeLocWriter::VisitVariableArrayTypeLoc(VariableArrayTypeLoc TL) {
555   VisitArrayTypeLoc(TL);
556 }
VisitDependentSizedArrayTypeLoc(DependentSizedArrayTypeLoc TL)557 void TypeLocWriter::VisitDependentSizedArrayTypeLoc(
558                                             DependentSizedArrayTypeLoc TL) {
559   VisitArrayTypeLoc(TL);
560 }
VisitDependentSizedExtVectorTypeLoc(DependentSizedExtVectorTypeLoc TL)561 void TypeLocWriter::VisitDependentSizedExtVectorTypeLoc(
562                                         DependentSizedExtVectorTypeLoc TL) {
563   Record.AddSourceLocation(TL.getNameLoc());
564 }
VisitVectorTypeLoc(VectorTypeLoc TL)565 void TypeLocWriter::VisitVectorTypeLoc(VectorTypeLoc TL) {
566   Record.AddSourceLocation(TL.getNameLoc());
567 }
VisitExtVectorTypeLoc(ExtVectorTypeLoc TL)568 void TypeLocWriter::VisitExtVectorTypeLoc(ExtVectorTypeLoc TL) {
569   Record.AddSourceLocation(TL.getNameLoc());
570 }
VisitFunctionTypeLoc(FunctionTypeLoc TL)571 void TypeLocWriter::VisitFunctionTypeLoc(FunctionTypeLoc TL) {
572   Record.AddSourceLocation(TL.getLocalRangeBegin());
573   Record.AddSourceLocation(TL.getLParenLoc());
574   Record.AddSourceLocation(TL.getRParenLoc());
575   Record.AddSourceLocation(TL.getLocalRangeEnd());
576   for (unsigned i = 0, e = TL.getNumParams(); i != e; ++i)
577     Record.AddDeclRef(TL.getParam(i));
578 }
VisitFunctionProtoTypeLoc(FunctionProtoTypeLoc TL)579 void TypeLocWriter::VisitFunctionProtoTypeLoc(FunctionProtoTypeLoc TL) {
580   VisitFunctionTypeLoc(TL);
581 }
VisitFunctionNoProtoTypeLoc(FunctionNoProtoTypeLoc TL)582 void TypeLocWriter::VisitFunctionNoProtoTypeLoc(FunctionNoProtoTypeLoc TL) {
583   VisitFunctionTypeLoc(TL);
584 }
VisitUnresolvedUsingTypeLoc(UnresolvedUsingTypeLoc TL)585 void TypeLocWriter::VisitUnresolvedUsingTypeLoc(UnresolvedUsingTypeLoc TL) {
586   Record.AddSourceLocation(TL.getNameLoc());
587 }
VisitTypedefTypeLoc(TypedefTypeLoc TL)588 void TypeLocWriter::VisitTypedefTypeLoc(TypedefTypeLoc TL) {
589   Record.AddSourceLocation(TL.getNameLoc());
590 }
VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL)591 void TypeLocWriter::VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) {
592   Record.AddSourceLocation(TL.getTypeofLoc());
593   Record.AddSourceLocation(TL.getLParenLoc());
594   Record.AddSourceLocation(TL.getRParenLoc());
595 }
VisitTypeOfTypeLoc(TypeOfTypeLoc TL)596 void TypeLocWriter::VisitTypeOfTypeLoc(TypeOfTypeLoc TL) {
597   Record.AddSourceLocation(TL.getTypeofLoc());
598   Record.AddSourceLocation(TL.getLParenLoc());
599   Record.AddSourceLocation(TL.getRParenLoc());
600   Record.AddTypeSourceInfo(TL.getUnderlyingTInfo());
601 }
VisitDecltypeTypeLoc(DecltypeTypeLoc TL)602 void TypeLocWriter::VisitDecltypeTypeLoc(DecltypeTypeLoc TL) {
603   Record.AddSourceLocation(TL.getNameLoc());
604 }
VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL)605 void TypeLocWriter::VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) {
606   Record.AddSourceLocation(TL.getKWLoc());
607   Record.AddSourceLocation(TL.getLParenLoc());
608   Record.AddSourceLocation(TL.getRParenLoc());
609   Record.AddTypeSourceInfo(TL.getUnderlyingTInfo());
610 }
VisitAutoTypeLoc(AutoTypeLoc TL)611 void TypeLocWriter::VisitAutoTypeLoc(AutoTypeLoc TL) {
612   Record.AddSourceLocation(TL.getNameLoc());
613 }
VisitRecordTypeLoc(RecordTypeLoc TL)614 void TypeLocWriter::VisitRecordTypeLoc(RecordTypeLoc TL) {
615   Record.AddSourceLocation(TL.getNameLoc());
616 }
VisitEnumTypeLoc(EnumTypeLoc TL)617 void TypeLocWriter::VisitEnumTypeLoc(EnumTypeLoc TL) {
618   Record.AddSourceLocation(TL.getNameLoc());
619 }
VisitAttributedTypeLoc(AttributedTypeLoc TL)620 void TypeLocWriter::VisitAttributedTypeLoc(AttributedTypeLoc TL) {
621   Record.AddSourceLocation(TL.getAttrNameLoc());
622   if (TL.hasAttrOperand()) {
623     SourceRange range = TL.getAttrOperandParensRange();
624     Record.AddSourceLocation(range.getBegin());
625     Record.AddSourceLocation(range.getEnd());
626   }
627   if (TL.hasAttrExprOperand()) {
628     Expr *operand = TL.getAttrExprOperand();
629     Record.push_back(operand ? 1 : 0);
630     if (operand) Record.AddStmt(operand);
631   } else if (TL.hasAttrEnumOperand()) {
632     Record.AddSourceLocation(TL.getAttrEnumOperandLoc());
633   }
634 }
VisitTemplateTypeParmTypeLoc(TemplateTypeParmTypeLoc TL)635 void TypeLocWriter::VisitTemplateTypeParmTypeLoc(TemplateTypeParmTypeLoc TL) {
636   Record.AddSourceLocation(TL.getNameLoc());
637 }
VisitSubstTemplateTypeParmTypeLoc(SubstTemplateTypeParmTypeLoc TL)638 void TypeLocWriter::VisitSubstTemplateTypeParmTypeLoc(
639                                             SubstTemplateTypeParmTypeLoc TL) {
640   Record.AddSourceLocation(TL.getNameLoc());
641 }
VisitSubstTemplateTypeParmPackTypeLoc(SubstTemplateTypeParmPackTypeLoc TL)642 void TypeLocWriter::VisitSubstTemplateTypeParmPackTypeLoc(
643                                           SubstTemplateTypeParmPackTypeLoc TL) {
644   Record.AddSourceLocation(TL.getNameLoc());
645 }
VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL)646 void TypeLocWriter::VisitTemplateSpecializationTypeLoc(
647                                            TemplateSpecializationTypeLoc TL) {
648   Record.AddSourceLocation(TL.getTemplateKeywordLoc());
649   Record.AddSourceLocation(TL.getTemplateNameLoc());
650   Record.AddSourceLocation(TL.getLAngleLoc());
651   Record.AddSourceLocation(TL.getRAngleLoc());
652   for (unsigned i = 0, e = TL.getNumArgs(); i != e; ++i)
653     Record.AddTemplateArgumentLocInfo(TL.getArgLoc(i).getArgument().getKind(),
654                                       TL.getArgLoc(i).getLocInfo());
655 }
VisitParenTypeLoc(ParenTypeLoc TL)656 void TypeLocWriter::VisitParenTypeLoc(ParenTypeLoc TL) {
657   Record.AddSourceLocation(TL.getLParenLoc());
658   Record.AddSourceLocation(TL.getRParenLoc());
659 }
VisitElaboratedTypeLoc(ElaboratedTypeLoc TL)660 void TypeLocWriter::VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) {
661   Record.AddSourceLocation(TL.getElaboratedKeywordLoc());
662   Record.AddNestedNameSpecifierLoc(TL.getQualifierLoc());
663 }
VisitInjectedClassNameTypeLoc(InjectedClassNameTypeLoc TL)664 void TypeLocWriter::VisitInjectedClassNameTypeLoc(InjectedClassNameTypeLoc TL) {
665   Record.AddSourceLocation(TL.getNameLoc());
666 }
VisitDependentNameTypeLoc(DependentNameTypeLoc TL)667 void TypeLocWriter::VisitDependentNameTypeLoc(DependentNameTypeLoc TL) {
668   Record.AddSourceLocation(TL.getElaboratedKeywordLoc());
669   Record.AddNestedNameSpecifierLoc(TL.getQualifierLoc());
670   Record.AddSourceLocation(TL.getNameLoc());
671 }
VisitDependentTemplateSpecializationTypeLoc(DependentTemplateSpecializationTypeLoc TL)672 void TypeLocWriter::VisitDependentTemplateSpecializationTypeLoc(
673        DependentTemplateSpecializationTypeLoc TL) {
674   Record.AddSourceLocation(TL.getElaboratedKeywordLoc());
675   Record.AddNestedNameSpecifierLoc(TL.getQualifierLoc());
676   Record.AddSourceLocation(TL.getTemplateKeywordLoc());
677   Record.AddSourceLocation(TL.getTemplateNameLoc());
678   Record.AddSourceLocation(TL.getLAngleLoc());
679   Record.AddSourceLocation(TL.getRAngleLoc());
680   for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I)
681     Record.AddTemplateArgumentLocInfo(TL.getArgLoc(I).getArgument().getKind(),
682                                       TL.getArgLoc(I).getLocInfo());
683 }
VisitPackExpansionTypeLoc(PackExpansionTypeLoc TL)684 void TypeLocWriter::VisitPackExpansionTypeLoc(PackExpansionTypeLoc TL) {
685   Record.AddSourceLocation(TL.getEllipsisLoc());
686 }
VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL)687 void TypeLocWriter::VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) {
688   Record.AddSourceLocation(TL.getNameLoc());
689 }
VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL)690 void TypeLocWriter::VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) {
691   Record.push_back(TL.hasBaseTypeAsWritten());
692   Record.AddSourceLocation(TL.getTypeArgsLAngleLoc());
693   Record.AddSourceLocation(TL.getTypeArgsRAngleLoc());
694   for (unsigned i = 0, e = TL.getNumTypeArgs(); i != e; ++i)
695     Record.AddTypeSourceInfo(TL.getTypeArgTInfo(i));
696   Record.AddSourceLocation(TL.getProtocolLAngleLoc());
697   Record.AddSourceLocation(TL.getProtocolRAngleLoc());
698   for (unsigned i = 0, e = TL.getNumProtocols(); i != e; ++i)
699     Record.AddSourceLocation(TL.getProtocolLoc(i));
700 }
VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL)701 void TypeLocWriter::VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
702   Record.AddSourceLocation(TL.getStarLoc());
703 }
VisitAtomicTypeLoc(AtomicTypeLoc TL)704 void TypeLocWriter::VisitAtomicTypeLoc(AtomicTypeLoc TL) {
705   Record.AddSourceLocation(TL.getKWLoc());
706   Record.AddSourceLocation(TL.getLParenLoc());
707   Record.AddSourceLocation(TL.getRParenLoc());
708 }
VisitPipeTypeLoc(PipeTypeLoc TL)709 void TypeLocWriter::VisitPipeTypeLoc(PipeTypeLoc TL) {
710   Record.AddSourceLocation(TL.getKWLoc());
711 }
712 
WriteTypeAbbrevs()713 void ASTWriter::WriteTypeAbbrevs() {
714   using namespace llvm;
715 
716   BitCodeAbbrev *Abv;
717 
718   // Abbreviation for TYPE_EXT_QUAL
719   Abv = new BitCodeAbbrev();
720   Abv->Add(BitCodeAbbrevOp(serialization::TYPE_EXT_QUAL));
721   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // Type
722   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 3));   // Quals
723   TypeExtQualAbbrev = Stream.EmitAbbrev(Abv);
724 
725   // Abbreviation for TYPE_FUNCTION_PROTO
726   Abv = new BitCodeAbbrev();
727   Abv->Add(BitCodeAbbrevOp(serialization::TYPE_FUNCTION_PROTO));
728   // FunctionType
729   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // ReturnType
730   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // NoReturn
731   Abv->Add(BitCodeAbbrevOp(0));                         // HasRegParm
732   Abv->Add(BitCodeAbbrevOp(0));                         // RegParm
733   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 4)); // CC
734   Abv->Add(BitCodeAbbrevOp(0));                         // ProducesResult
735   // FunctionProtoType
736   Abv->Add(BitCodeAbbrevOp(0));                         // IsVariadic
737   Abv->Add(BitCodeAbbrevOp(0));                         // HasTrailingReturn
738   Abv->Add(BitCodeAbbrevOp(0));                         // TypeQuals
739   Abv->Add(BitCodeAbbrevOp(0));                         // RefQualifier
740   Abv->Add(BitCodeAbbrevOp(EST_None));                  // ExceptionSpec
741   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // NumParams
742   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
743   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // Params
744   TypeFunctionProtoAbbrev = Stream.EmitAbbrev(Abv);
745 }
746 
747 //===----------------------------------------------------------------------===//
748 // ASTWriter Implementation
749 //===----------------------------------------------------------------------===//
750 
EmitBlockID(unsigned ID,const char * Name,llvm::BitstreamWriter & Stream,ASTWriter::RecordDataImpl & Record)751 static void EmitBlockID(unsigned ID, const char *Name,
752                         llvm::BitstreamWriter &Stream,
753                         ASTWriter::RecordDataImpl &Record) {
754   Record.clear();
755   Record.push_back(ID);
756   Stream.EmitRecord(llvm::bitc::BLOCKINFO_CODE_SETBID, Record);
757 
758   // Emit the block name if present.
759   if (!Name || Name[0] == 0)
760     return;
761   Record.clear();
762   while (*Name)
763     Record.push_back(*Name++);
764   Stream.EmitRecord(llvm::bitc::BLOCKINFO_CODE_BLOCKNAME, Record);
765 }
766 
EmitRecordID(unsigned ID,const char * Name,llvm::BitstreamWriter & Stream,ASTWriter::RecordDataImpl & Record)767 static void EmitRecordID(unsigned ID, const char *Name,
768                          llvm::BitstreamWriter &Stream,
769                          ASTWriter::RecordDataImpl &Record) {
770   Record.clear();
771   Record.push_back(ID);
772   while (*Name)
773     Record.push_back(*Name++);
774   Stream.EmitRecord(llvm::bitc::BLOCKINFO_CODE_SETRECORDNAME, Record);
775 }
776 
AddStmtsExprs(llvm::BitstreamWriter & Stream,ASTWriter::RecordDataImpl & Record)777 static void AddStmtsExprs(llvm::BitstreamWriter &Stream,
778                           ASTWriter::RecordDataImpl &Record) {
779 #define RECORD(X) EmitRecordID(X, #X, Stream, Record)
780   RECORD(STMT_STOP);
781   RECORD(STMT_NULL_PTR);
782   RECORD(STMT_REF_PTR);
783   RECORD(STMT_NULL);
784   RECORD(STMT_COMPOUND);
785   RECORD(STMT_CASE);
786   RECORD(STMT_DEFAULT);
787   RECORD(STMT_LABEL);
788   RECORD(STMT_ATTRIBUTED);
789   RECORD(STMT_IF);
790   RECORD(STMT_SWITCH);
791   RECORD(STMT_WHILE);
792   RECORD(STMT_DO);
793   RECORD(STMT_FOR);
794   RECORD(STMT_GOTO);
795   RECORD(STMT_INDIRECT_GOTO);
796   RECORD(STMT_CONTINUE);
797   RECORD(STMT_BREAK);
798   RECORD(STMT_RETURN);
799   RECORD(STMT_DECL);
800   RECORD(STMT_GCCASM);
801   RECORD(STMT_MSASM);
802   RECORD(EXPR_PREDEFINED);
803   RECORD(EXPR_DECL_REF);
804   RECORD(EXPR_INTEGER_LITERAL);
805   RECORD(EXPR_FLOATING_LITERAL);
806   RECORD(EXPR_IMAGINARY_LITERAL);
807   RECORD(EXPR_STRING_LITERAL);
808   RECORD(EXPR_CHARACTER_LITERAL);
809   RECORD(EXPR_PAREN);
810   RECORD(EXPR_PAREN_LIST);
811   RECORD(EXPR_UNARY_OPERATOR);
812   RECORD(EXPR_SIZEOF_ALIGN_OF);
813   RECORD(EXPR_ARRAY_SUBSCRIPT);
814   RECORD(EXPR_CALL);
815   RECORD(EXPR_MEMBER);
816   RECORD(EXPR_BINARY_OPERATOR);
817   RECORD(EXPR_COMPOUND_ASSIGN_OPERATOR);
818   RECORD(EXPR_CONDITIONAL_OPERATOR);
819   RECORD(EXPR_IMPLICIT_CAST);
820   RECORD(EXPR_CSTYLE_CAST);
821   RECORD(EXPR_COMPOUND_LITERAL);
822   RECORD(EXPR_EXT_VECTOR_ELEMENT);
823   RECORD(EXPR_INIT_LIST);
824   RECORD(EXPR_DESIGNATED_INIT);
825   RECORD(EXPR_DESIGNATED_INIT_UPDATE);
826   RECORD(EXPR_IMPLICIT_VALUE_INIT);
827   RECORD(EXPR_NO_INIT);
828   RECORD(EXPR_VA_ARG);
829   RECORD(EXPR_ADDR_LABEL);
830   RECORD(EXPR_STMT);
831   RECORD(EXPR_CHOOSE);
832   RECORD(EXPR_GNU_NULL);
833   RECORD(EXPR_SHUFFLE_VECTOR);
834   RECORD(EXPR_BLOCK);
835   RECORD(EXPR_GENERIC_SELECTION);
836   RECORD(EXPR_OBJC_STRING_LITERAL);
837   RECORD(EXPR_OBJC_BOXED_EXPRESSION);
838   RECORD(EXPR_OBJC_ARRAY_LITERAL);
839   RECORD(EXPR_OBJC_DICTIONARY_LITERAL);
840   RECORD(EXPR_OBJC_ENCODE);
841   RECORD(EXPR_OBJC_SELECTOR_EXPR);
842   RECORD(EXPR_OBJC_PROTOCOL_EXPR);
843   RECORD(EXPR_OBJC_IVAR_REF_EXPR);
844   RECORD(EXPR_OBJC_PROPERTY_REF_EXPR);
845   RECORD(EXPR_OBJC_KVC_REF_EXPR);
846   RECORD(EXPR_OBJC_MESSAGE_EXPR);
847   RECORD(STMT_OBJC_FOR_COLLECTION);
848   RECORD(STMT_OBJC_CATCH);
849   RECORD(STMT_OBJC_FINALLY);
850   RECORD(STMT_OBJC_AT_TRY);
851   RECORD(STMT_OBJC_AT_SYNCHRONIZED);
852   RECORD(STMT_OBJC_AT_THROW);
853   RECORD(EXPR_OBJC_BOOL_LITERAL);
854   RECORD(STMT_CXX_CATCH);
855   RECORD(STMT_CXX_TRY);
856   RECORD(STMT_CXX_FOR_RANGE);
857   RECORD(EXPR_CXX_OPERATOR_CALL);
858   RECORD(EXPR_CXX_MEMBER_CALL);
859   RECORD(EXPR_CXX_CONSTRUCT);
860   RECORD(EXPR_CXX_TEMPORARY_OBJECT);
861   RECORD(EXPR_CXX_STATIC_CAST);
862   RECORD(EXPR_CXX_DYNAMIC_CAST);
863   RECORD(EXPR_CXX_REINTERPRET_CAST);
864   RECORD(EXPR_CXX_CONST_CAST);
865   RECORD(EXPR_CXX_FUNCTIONAL_CAST);
866   RECORD(EXPR_USER_DEFINED_LITERAL);
867   RECORD(EXPR_CXX_STD_INITIALIZER_LIST);
868   RECORD(EXPR_CXX_BOOL_LITERAL);
869   RECORD(EXPR_CXX_NULL_PTR_LITERAL);
870   RECORD(EXPR_CXX_TYPEID_EXPR);
871   RECORD(EXPR_CXX_TYPEID_TYPE);
872   RECORD(EXPR_CXX_THIS);
873   RECORD(EXPR_CXX_THROW);
874   RECORD(EXPR_CXX_DEFAULT_ARG);
875   RECORD(EXPR_CXX_DEFAULT_INIT);
876   RECORD(EXPR_CXX_BIND_TEMPORARY);
877   RECORD(EXPR_CXX_SCALAR_VALUE_INIT);
878   RECORD(EXPR_CXX_NEW);
879   RECORD(EXPR_CXX_DELETE);
880   RECORD(EXPR_CXX_PSEUDO_DESTRUCTOR);
881   RECORD(EXPR_EXPR_WITH_CLEANUPS);
882   RECORD(EXPR_CXX_DEPENDENT_SCOPE_MEMBER);
883   RECORD(EXPR_CXX_DEPENDENT_SCOPE_DECL_REF);
884   RECORD(EXPR_CXX_UNRESOLVED_CONSTRUCT);
885   RECORD(EXPR_CXX_UNRESOLVED_MEMBER);
886   RECORD(EXPR_CXX_UNRESOLVED_LOOKUP);
887   RECORD(EXPR_CXX_EXPRESSION_TRAIT);
888   RECORD(EXPR_CXX_NOEXCEPT);
889   RECORD(EXPR_OPAQUE_VALUE);
890   RECORD(EXPR_BINARY_CONDITIONAL_OPERATOR);
891   RECORD(EXPR_TYPE_TRAIT);
892   RECORD(EXPR_ARRAY_TYPE_TRAIT);
893   RECORD(EXPR_PACK_EXPANSION);
894   RECORD(EXPR_SIZEOF_PACK);
895   RECORD(EXPR_SUBST_NON_TYPE_TEMPLATE_PARM);
896   RECORD(EXPR_SUBST_NON_TYPE_TEMPLATE_PARM_PACK);
897   RECORD(EXPR_FUNCTION_PARM_PACK);
898   RECORD(EXPR_MATERIALIZE_TEMPORARY);
899   RECORD(EXPR_CUDA_KERNEL_CALL);
900   RECORD(EXPR_CXX_UUIDOF_EXPR);
901   RECORD(EXPR_CXX_UUIDOF_TYPE);
902   RECORD(EXPR_LAMBDA);
903 #undef RECORD
904 }
905 
WriteBlockInfoBlock()906 void ASTWriter::WriteBlockInfoBlock() {
907   RecordData Record;
908   Stream.EnterSubblock(llvm::bitc::BLOCKINFO_BLOCK_ID, 3);
909 
910 #define BLOCK(X) EmitBlockID(X ## _ID, #X, Stream, Record)
911 #define RECORD(X) EmitRecordID(X, #X, Stream, Record)
912 
913   // Control Block.
914   BLOCK(CONTROL_BLOCK);
915   RECORD(METADATA);
916   RECORD(SIGNATURE);
917   RECORD(MODULE_NAME);
918   RECORD(MODULE_DIRECTORY);
919   RECORD(MODULE_MAP_FILE);
920   RECORD(IMPORTS);
921   RECORD(ORIGINAL_FILE);
922   RECORD(ORIGINAL_PCH_DIR);
923   RECORD(ORIGINAL_FILE_ID);
924   RECORD(INPUT_FILE_OFFSETS);
925 
926   BLOCK(OPTIONS_BLOCK);
927   RECORD(LANGUAGE_OPTIONS);
928   RECORD(TARGET_OPTIONS);
929   RECORD(DIAGNOSTIC_OPTIONS);
930   RECORD(FILE_SYSTEM_OPTIONS);
931   RECORD(HEADER_SEARCH_OPTIONS);
932   RECORD(PREPROCESSOR_OPTIONS);
933 
934   BLOCK(INPUT_FILES_BLOCK);
935   RECORD(INPUT_FILE);
936 
937   // AST Top-Level Block.
938   BLOCK(AST_BLOCK);
939   RECORD(TYPE_OFFSET);
940   RECORD(DECL_OFFSET);
941   RECORD(IDENTIFIER_OFFSET);
942   RECORD(IDENTIFIER_TABLE);
943   RECORD(EAGERLY_DESERIALIZED_DECLS);
944   RECORD(SPECIAL_TYPES);
945   RECORD(STATISTICS);
946   RECORD(TENTATIVE_DEFINITIONS);
947   RECORD(SELECTOR_OFFSETS);
948   RECORD(METHOD_POOL);
949   RECORD(PP_COUNTER_VALUE);
950   RECORD(SOURCE_LOCATION_OFFSETS);
951   RECORD(SOURCE_LOCATION_PRELOADS);
952   RECORD(EXT_VECTOR_DECLS);
953   RECORD(UNUSED_FILESCOPED_DECLS);
954   RECORD(PPD_ENTITIES_OFFSETS);
955   RECORD(VTABLE_USES);
956   RECORD(REFERENCED_SELECTOR_POOL);
957   RECORD(TU_UPDATE_LEXICAL);
958   RECORD(SEMA_DECL_REFS);
959   RECORD(WEAK_UNDECLARED_IDENTIFIERS);
960   RECORD(PENDING_IMPLICIT_INSTANTIATIONS);
961   RECORD(UPDATE_VISIBLE);
962   RECORD(DECL_UPDATE_OFFSETS);
963   RECORD(DECL_UPDATES);
964   RECORD(DIAG_PRAGMA_MAPPINGS);
965   RECORD(CUDA_SPECIAL_DECL_REFS);
966   RECORD(HEADER_SEARCH_TABLE);
967   RECORD(FP_PRAGMA_OPTIONS);
968   RECORD(OPENCL_EXTENSIONS);
969   RECORD(DELEGATING_CTORS);
970   RECORD(KNOWN_NAMESPACES);
971   RECORD(MODULE_OFFSET_MAP);
972   RECORD(SOURCE_MANAGER_LINE_TABLE);
973   RECORD(OBJC_CATEGORIES_MAP);
974   RECORD(FILE_SORTED_DECLS);
975   RECORD(IMPORTED_MODULES);
976   RECORD(OBJC_CATEGORIES);
977   RECORD(MACRO_OFFSET);
978   RECORD(INTERESTING_IDENTIFIERS);
979   RECORD(UNDEFINED_BUT_USED);
980   RECORD(LATE_PARSED_TEMPLATE);
981   RECORD(OPTIMIZE_PRAGMA_OPTIONS);
982   RECORD(MSSTRUCT_PRAGMA_OPTIONS);
983   RECORD(POINTERS_TO_MEMBERS_PRAGMA_OPTIONS);
984   RECORD(UNUSED_LOCAL_TYPEDEF_NAME_CANDIDATES);
985   RECORD(DELETE_EXPRS_TO_ANALYZE);
986 
987   // SourceManager Block.
988   BLOCK(SOURCE_MANAGER_BLOCK);
989   RECORD(SM_SLOC_FILE_ENTRY);
990   RECORD(SM_SLOC_BUFFER_ENTRY);
991   RECORD(SM_SLOC_BUFFER_BLOB);
992   RECORD(SM_SLOC_BUFFER_BLOB_COMPRESSED);
993   RECORD(SM_SLOC_EXPANSION_ENTRY);
994 
995   // Preprocessor Block.
996   BLOCK(PREPROCESSOR_BLOCK);
997   RECORD(PP_MACRO_DIRECTIVE_HISTORY);
998   RECORD(PP_MACRO_FUNCTION_LIKE);
999   RECORD(PP_MACRO_OBJECT_LIKE);
1000   RECORD(PP_MODULE_MACRO);
1001   RECORD(PP_TOKEN);
1002 
1003   // Submodule Block.
1004   BLOCK(SUBMODULE_BLOCK);
1005   RECORD(SUBMODULE_METADATA);
1006   RECORD(SUBMODULE_DEFINITION);
1007   RECORD(SUBMODULE_UMBRELLA_HEADER);
1008   RECORD(SUBMODULE_HEADER);
1009   RECORD(SUBMODULE_TOPHEADER);
1010   RECORD(SUBMODULE_UMBRELLA_DIR);
1011   RECORD(SUBMODULE_IMPORTS);
1012   RECORD(SUBMODULE_EXPORTS);
1013   RECORD(SUBMODULE_REQUIRES);
1014   RECORD(SUBMODULE_EXCLUDED_HEADER);
1015   RECORD(SUBMODULE_LINK_LIBRARY);
1016   RECORD(SUBMODULE_CONFIG_MACRO);
1017   RECORD(SUBMODULE_CONFLICT);
1018   RECORD(SUBMODULE_PRIVATE_HEADER);
1019   RECORD(SUBMODULE_TEXTUAL_HEADER);
1020   RECORD(SUBMODULE_PRIVATE_TEXTUAL_HEADER);
1021 
1022   // Comments Block.
1023   BLOCK(COMMENTS_BLOCK);
1024   RECORD(COMMENTS_RAW_COMMENT);
1025 
1026   // Decls and Types block.
1027   BLOCK(DECLTYPES_BLOCK);
1028   RECORD(TYPE_EXT_QUAL);
1029   RECORD(TYPE_COMPLEX);
1030   RECORD(TYPE_POINTER);
1031   RECORD(TYPE_BLOCK_POINTER);
1032   RECORD(TYPE_LVALUE_REFERENCE);
1033   RECORD(TYPE_RVALUE_REFERENCE);
1034   RECORD(TYPE_MEMBER_POINTER);
1035   RECORD(TYPE_CONSTANT_ARRAY);
1036   RECORD(TYPE_INCOMPLETE_ARRAY);
1037   RECORD(TYPE_VARIABLE_ARRAY);
1038   RECORD(TYPE_VECTOR);
1039   RECORD(TYPE_EXT_VECTOR);
1040   RECORD(TYPE_FUNCTION_NO_PROTO);
1041   RECORD(TYPE_FUNCTION_PROTO);
1042   RECORD(TYPE_TYPEDEF);
1043   RECORD(TYPE_TYPEOF_EXPR);
1044   RECORD(TYPE_TYPEOF);
1045   RECORD(TYPE_RECORD);
1046   RECORD(TYPE_ENUM);
1047   RECORD(TYPE_OBJC_INTERFACE);
1048   RECORD(TYPE_OBJC_OBJECT_POINTER);
1049   RECORD(TYPE_DECLTYPE);
1050   RECORD(TYPE_ELABORATED);
1051   RECORD(TYPE_SUBST_TEMPLATE_TYPE_PARM);
1052   RECORD(TYPE_UNRESOLVED_USING);
1053   RECORD(TYPE_INJECTED_CLASS_NAME);
1054   RECORD(TYPE_OBJC_OBJECT);
1055   RECORD(TYPE_TEMPLATE_TYPE_PARM);
1056   RECORD(TYPE_TEMPLATE_SPECIALIZATION);
1057   RECORD(TYPE_DEPENDENT_NAME);
1058   RECORD(TYPE_DEPENDENT_TEMPLATE_SPECIALIZATION);
1059   RECORD(TYPE_DEPENDENT_SIZED_ARRAY);
1060   RECORD(TYPE_PAREN);
1061   RECORD(TYPE_PACK_EXPANSION);
1062   RECORD(TYPE_ATTRIBUTED);
1063   RECORD(TYPE_SUBST_TEMPLATE_TYPE_PARM_PACK);
1064   RECORD(TYPE_AUTO);
1065   RECORD(TYPE_UNARY_TRANSFORM);
1066   RECORD(TYPE_ATOMIC);
1067   RECORD(TYPE_DECAYED);
1068   RECORD(TYPE_ADJUSTED);
1069   RECORD(LOCAL_REDECLARATIONS);
1070   RECORD(DECL_TYPEDEF);
1071   RECORD(DECL_TYPEALIAS);
1072   RECORD(DECL_ENUM);
1073   RECORD(DECL_RECORD);
1074   RECORD(DECL_ENUM_CONSTANT);
1075   RECORD(DECL_FUNCTION);
1076   RECORD(DECL_OBJC_METHOD);
1077   RECORD(DECL_OBJC_INTERFACE);
1078   RECORD(DECL_OBJC_PROTOCOL);
1079   RECORD(DECL_OBJC_IVAR);
1080   RECORD(DECL_OBJC_AT_DEFS_FIELD);
1081   RECORD(DECL_OBJC_CATEGORY);
1082   RECORD(DECL_OBJC_CATEGORY_IMPL);
1083   RECORD(DECL_OBJC_IMPLEMENTATION);
1084   RECORD(DECL_OBJC_COMPATIBLE_ALIAS);
1085   RECORD(DECL_OBJC_PROPERTY);
1086   RECORD(DECL_OBJC_PROPERTY_IMPL);
1087   RECORD(DECL_FIELD);
1088   RECORD(DECL_MS_PROPERTY);
1089   RECORD(DECL_VAR);
1090   RECORD(DECL_IMPLICIT_PARAM);
1091   RECORD(DECL_PARM_VAR);
1092   RECORD(DECL_FILE_SCOPE_ASM);
1093   RECORD(DECL_BLOCK);
1094   RECORD(DECL_CONTEXT_LEXICAL);
1095   RECORD(DECL_CONTEXT_VISIBLE);
1096   RECORD(DECL_NAMESPACE);
1097   RECORD(DECL_NAMESPACE_ALIAS);
1098   RECORD(DECL_USING);
1099   RECORD(DECL_USING_SHADOW);
1100   RECORD(DECL_USING_DIRECTIVE);
1101   RECORD(DECL_UNRESOLVED_USING_VALUE);
1102   RECORD(DECL_UNRESOLVED_USING_TYPENAME);
1103   RECORD(DECL_LINKAGE_SPEC);
1104   RECORD(DECL_CXX_RECORD);
1105   RECORD(DECL_CXX_METHOD);
1106   RECORD(DECL_CXX_CONSTRUCTOR);
1107   RECORD(DECL_CXX_INHERITED_CONSTRUCTOR);
1108   RECORD(DECL_CXX_DESTRUCTOR);
1109   RECORD(DECL_CXX_CONVERSION);
1110   RECORD(DECL_ACCESS_SPEC);
1111   RECORD(DECL_FRIEND);
1112   RECORD(DECL_FRIEND_TEMPLATE);
1113   RECORD(DECL_CLASS_TEMPLATE);
1114   RECORD(DECL_CLASS_TEMPLATE_SPECIALIZATION);
1115   RECORD(DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION);
1116   RECORD(DECL_VAR_TEMPLATE);
1117   RECORD(DECL_VAR_TEMPLATE_SPECIALIZATION);
1118   RECORD(DECL_VAR_TEMPLATE_PARTIAL_SPECIALIZATION);
1119   RECORD(DECL_FUNCTION_TEMPLATE);
1120   RECORD(DECL_TEMPLATE_TYPE_PARM);
1121   RECORD(DECL_NON_TYPE_TEMPLATE_PARM);
1122   RECORD(DECL_TEMPLATE_TEMPLATE_PARM);
1123   RECORD(DECL_TYPE_ALIAS_TEMPLATE);
1124   RECORD(DECL_STATIC_ASSERT);
1125   RECORD(DECL_CXX_BASE_SPECIFIERS);
1126   RECORD(DECL_CXX_CTOR_INITIALIZERS);
1127   RECORD(DECL_INDIRECTFIELD);
1128   RECORD(DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK);
1129   RECORD(DECL_EXPANDED_TEMPLATE_TEMPLATE_PARM_PACK);
1130   RECORD(DECL_CLASS_SCOPE_FUNCTION_SPECIALIZATION);
1131   RECORD(DECL_IMPORT);
1132   RECORD(DECL_OMP_THREADPRIVATE);
1133   RECORD(DECL_EMPTY);
1134   RECORD(DECL_OBJC_TYPE_PARAM);
1135   RECORD(DECL_OMP_CAPTUREDEXPR);
1136   RECORD(DECL_PRAGMA_COMMENT);
1137   RECORD(DECL_PRAGMA_DETECT_MISMATCH);
1138   RECORD(DECL_OMP_DECLARE_REDUCTION);
1139 
1140   // Statements and Exprs can occur in the Decls and Types block.
1141   AddStmtsExprs(Stream, Record);
1142 
1143   BLOCK(PREPROCESSOR_DETAIL_BLOCK);
1144   RECORD(PPD_MACRO_EXPANSION);
1145   RECORD(PPD_MACRO_DEFINITION);
1146   RECORD(PPD_INCLUSION_DIRECTIVE);
1147 
1148   // Decls and Types block.
1149   BLOCK(EXTENSION_BLOCK);
1150   RECORD(EXTENSION_METADATA);
1151 
1152 #undef RECORD
1153 #undef BLOCK
1154   Stream.ExitBlock();
1155 }
1156 
1157 /// \brief Prepares a path for being written to an AST file by converting it
1158 /// to an absolute path and removing nested './'s.
1159 ///
1160 /// \return \c true if the path was changed.
cleanPathForOutput(FileManager & FileMgr,SmallVectorImpl<char> & Path)1161 static bool cleanPathForOutput(FileManager &FileMgr,
1162                                SmallVectorImpl<char> &Path) {
1163   bool Changed = FileMgr.makeAbsolutePath(Path);
1164   return Changed | llvm::sys::path::remove_dots(Path);
1165 }
1166 
1167 /// \brief Adjusts the given filename to only write out the portion of the
1168 /// filename that is not part of the system root directory.
1169 ///
1170 /// \param Filename the file name to adjust.
1171 ///
1172 /// \param BaseDir When non-NULL, the PCH file is a relocatable AST file and
1173 /// the returned filename will be adjusted by this root directory.
1174 ///
1175 /// \returns either the original filename (if it needs no adjustment) or the
1176 /// adjusted filename (which points into the @p Filename parameter).
1177 static const char *
adjustFilenameForRelocatableAST(const char * Filename,StringRef BaseDir)1178 adjustFilenameForRelocatableAST(const char *Filename, StringRef BaseDir) {
1179   assert(Filename && "No file name to adjust?");
1180 
1181   if (BaseDir.empty())
1182     return Filename;
1183 
1184   // Verify that the filename and the system root have the same prefix.
1185   unsigned Pos = 0;
1186   for (; Filename[Pos] && Pos < BaseDir.size(); ++Pos)
1187     if (Filename[Pos] != BaseDir[Pos])
1188       return Filename; // Prefixes don't match.
1189 
1190   // We hit the end of the filename before we hit the end of the system root.
1191   if (!Filename[Pos])
1192     return Filename;
1193 
1194   // If there's not a path separator at the end of the base directory nor
1195   // immediately after it, then this isn't within the base directory.
1196   if (!llvm::sys::path::is_separator(Filename[Pos])) {
1197     if (!llvm::sys::path::is_separator(BaseDir.back()))
1198       return Filename;
1199   } else {
1200     // If the file name has a '/' at the current position, skip over the '/'.
1201     // We distinguish relative paths from absolute paths by the
1202     // absence of '/' at the beginning of relative paths.
1203     //
1204     // FIXME: This is wrong. We distinguish them by asking if the path is
1205     // absolute, which isn't the same thing. And there might be multiple '/'s
1206     // in a row. Use a better mechanism to indicate whether we have emitted an
1207     // absolute or relative path.
1208     ++Pos;
1209   }
1210 
1211   return Filename + Pos;
1212 }
1213 
getSignature()1214 static ASTFileSignature getSignature() {
1215   while (1) {
1216     if (ASTFileSignature S = llvm::sys::Process::GetRandomNumber())
1217       return S;
1218     // Rely on GetRandomNumber to eventually return non-zero...
1219   }
1220 }
1221 
1222 /// \brief Write the control block.
WriteControlBlock(Preprocessor & PP,ASTContext & Context,StringRef isysroot,const std::string & OutputFile)1223 uint64_t ASTWriter::WriteControlBlock(Preprocessor &PP,
1224                                       ASTContext &Context,
1225                                       StringRef isysroot,
1226                                       const std::string &OutputFile) {
1227   ASTFileSignature Signature = 0;
1228 
1229   using namespace llvm;
1230   Stream.EnterSubblock(CONTROL_BLOCK_ID, 5);
1231   RecordData Record;
1232 
1233   // Metadata
1234   auto *MetadataAbbrev = new BitCodeAbbrev();
1235   MetadataAbbrev->Add(BitCodeAbbrevOp(METADATA));
1236   MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // Major
1237   MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // Minor
1238   MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // Clang maj.
1239   MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // Clang min.
1240   MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Relocatable
1241   MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Timestamps
1242   MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Errors
1243   MetadataAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // SVN branch/tag
1244   unsigned MetadataAbbrevCode = Stream.EmitAbbrev(MetadataAbbrev);
1245   assert((!WritingModule || isysroot.empty()) &&
1246          "writing module as a relocatable PCH?");
1247   {
1248     RecordData::value_type Record[] = {METADATA, VERSION_MAJOR, VERSION_MINOR,
1249                                        CLANG_VERSION_MAJOR, CLANG_VERSION_MINOR,
1250                                        !isysroot.empty(), IncludeTimestamps,
1251                                        ASTHasCompilerErrors};
1252     Stream.EmitRecordWithBlob(MetadataAbbrevCode, Record,
1253                               getClangFullRepositoryVersion());
1254   }
1255   if (WritingModule) {
1256     // For implicit modules we output a signature that we can use to ensure
1257     // duplicate module builds don't collide in the cache as their output order
1258     // is non-deterministic.
1259     // FIXME: Remove this when output is deterministic.
1260     if (Context.getLangOpts().ImplicitModules) {
1261       Signature = getSignature();
1262       RecordData::value_type Record[] = {Signature};
1263       Stream.EmitRecord(SIGNATURE, Record);
1264     }
1265 
1266     // Module name
1267     auto *Abbrev = new BitCodeAbbrev();
1268     Abbrev->Add(BitCodeAbbrevOp(MODULE_NAME));
1269     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
1270     unsigned AbbrevCode = Stream.EmitAbbrev(Abbrev);
1271     RecordData::value_type Record[] = {MODULE_NAME};
1272     Stream.EmitRecordWithBlob(AbbrevCode, Record, WritingModule->Name);
1273   }
1274 
1275   if (WritingModule && WritingModule->Directory) {
1276     SmallString<128> BaseDir(WritingModule->Directory->getName());
1277     cleanPathForOutput(Context.getSourceManager().getFileManager(), BaseDir);
1278 
1279     // If the home of the module is the current working directory, then we
1280     // want to pick up the cwd of the build process loading the module, not
1281     // our cwd, when we load this module.
1282     if (!PP.getHeaderSearchInfo()
1283              .getHeaderSearchOpts()
1284              .ModuleMapFileHomeIsCwd ||
1285         WritingModule->Directory->getName() != StringRef(".")) {
1286       // Module directory.
1287       auto *Abbrev = new BitCodeAbbrev();
1288       Abbrev->Add(BitCodeAbbrevOp(MODULE_DIRECTORY));
1289       Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Directory
1290       unsigned AbbrevCode = Stream.EmitAbbrev(Abbrev);
1291 
1292       RecordData::value_type Record[] = {MODULE_DIRECTORY};
1293       Stream.EmitRecordWithBlob(AbbrevCode, Record, BaseDir);
1294     }
1295 
1296     // Write out all other paths relative to the base directory if possible.
1297     BaseDirectory.assign(BaseDir.begin(), BaseDir.end());
1298   } else if (!isysroot.empty()) {
1299     // Write out paths relative to the sysroot if possible.
1300     BaseDirectory = isysroot;
1301   }
1302 
1303   // Module map file
1304   if (WritingModule) {
1305     Record.clear();
1306 
1307     auto &Map = PP.getHeaderSearchInfo().getModuleMap();
1308 
1309     // Primary module map file.
1310     AddPath(Map.getModuleMapFileForUniquing(WritingModule)->getName(), Record);
1311 
1312     // Additional module map files.
1313     if (auto *AdditionalModMaps =
1314             Map.getAdditionalModuleMapFiles(WritingModule)) {
1315       Record.push_back(AdditionalModMaps->size());
1316       for (const FileEntry *F : *AdditionalModMaps)
1317         AddPath(F->getName(), Record);
1318     } else {
1319       Record.push_back(0);
1320     }
1321 
1322     Stream.EmitRecord(MODULE_MAP_FILE, Record);
1323   }
1324 
1325   // Imports
1326   if (Chain) {
1327     serialization::ModuleManager &Mgr = Chain->getModuleManager();
1328     Record.clear();
1329 
1330     for (auto *M : Mgr) {
1331       // Skip modules that weren't directly imported.
1332       if (!M->isDirectlyImported())
1333         continue;
1334 
1335       Record.push_back((unsigned)M->Kind); // FIXME: Stable encoding
1336       AddSourceLocation(M->ImportLoc, Record);
1337       Record.push_back(M->File->getSize());
1338       Record.push_back(getTimestampForOutput(M->File));
1339       Record.push_back(M->Signature);
1340       AddPath(M->FileName, Record);
1341     }
1342     Stream.EmitRecord(IMPORTS, Record);
1343   }
1344 
1345   // Write the options block.
1346   Stream.EnterSubblock(OPTIONS_BLOCK_ID, 4);
1347 
1348   // Language options.
1349   Record.clear();
1350   const LangOptions &LangOpts = Context.getLangOpts();
1351 #define LANGOPT(Name, Bits, Default, Description) \
1352   Record.push_back(LangOpts.Name);
1353 #define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
1354   Record.push_back(static_cast<unsigned>(LangOpts.get##Name()));
1355 #include "clang/Basic/LangOptions.def"
1356 #define SANITIZER(NAME, ID)                                                    \
1357   Record.push_back(LangOpts.Sanitize.has(SanitizerKind::ID));
1358 #include "clang/Basic/Sanitizers.def"
1359 
1360   Record.push_back(LangOpts.ModuleFeatures.size());
1361   for (StringRef Feature : LangOpts.ModuleFeatures)
1362     AddString(Feature, Record);
1363 
1364   Record.push_back((unsigned) LangOpts.ObjCRuntime.getKind());
1365   AddVersionTuple(LangOpts.ObjCRuntime.getVersion(), Record);
1366 
1367   AddString(LangOpts.CurrentModule, Record);
1368 
1369   // Comment options.
1370   Record.push_back(LangOpts.CommentOpts.BlockCommandNames.size());
1371   for (const auto &I : LangOpts.CommentOpts.BlockCommandNames) {
1372     AddString(I, Record);
1373   }
1374   Record.push_back(LangOpts.CommentOpts.ParseAllComments);
1375 
1376   // OpenMP offloading options.
1377   Record.push_back(LangOpts.OMPTargetTriples.size());
1378   for (auto &T : LangOpts.OMPTargetTriples)
1379     AddString(T.getTriple(), Record);
1380 
1381   AddString(LangOpts.OMPHostIRFile, Record);
1382 
1383   Stream.EmitRecord(LANGUAGE_OPTIONS, Record);
1384 
1385   // Target options.
1386   Record.clear();
1387   const TargetInfo &Target = Context.getTargetInfo();
1388   const TargetOptions &TargetOpts = Target.getTargetOpts();
1389   AddString(TargetOpts.Triple, Record);
1390   AddString(TargetOpts.CPU, Record);
1391   AddString(TargetOpts.ABI, Record);
1392   Record.push_back(TargetOpts.FeaturesAsWritten.size());
1393   for (unsigned I = 0, N = TargetOpts.FeaturesAsWritten.size(); I != N; ++I) {
1394     AddString(TargetOpts.FeaturesAsWritten[I], Record);
1395   }
1396   Record.push_back(TargetOpts.Features.size());
1397   for (unsigned I = 0, N = TargetOpts.Features.size(); I != N; ++I) {
1398     AddString(TargetOpts.Features[I], Record);
1399   }
1400   Stream.EmitRecord(TARGET_OPTIONS, Record);
1401 
1402   // Diagnostic options.
1403   Record.clear();
1404   const DiagnosticOptions &DiagOpts
1405     = Context.getDiagnostics().getDiagnosticOptions();
1406 #define DIAGOPT(Name, Bits, Default) Record.push_back(DiagOpts.Name);
1407 #define ENUM_DIAGOPT(Name, Type, Bits, Default) \
1408   Record.push_back(static_cast<unsigned>(DiagOpts.get##Name()));
1409 #include "clang/Basic/DiagnosticOptions.def"
1410   Record.push_back(DiagOpts.Warnings.size());
1411   for (unsigned I = 0, N = DiagOpts.Warnings.size(); I != N; ++I)
1412     AddString(DiagOpts.Warnings[I], Record);
1413   Record.push_back(DiagOpts.Remarks.size());
1414   for (unsigned I = 0, N = DiagOpts.Remarks.size(); I != N; ++I)
1415     AddString(DiagOpts.Remarks[I], Record);
1416   // Note: we don't serialize the log or serialization file names, because they
1417   // are generally transient files and will almost always be overridden.
1418   Stream.EmitRecord(DIAGNOSTIC_OPTIONS, Record);
1419 
1420   // File system options.
1421   Record.clear();
1422   const FileSystemOptions &FSOpts =
1423       Context.getSourceManager().getFileManager().getFileSystemOpts();
1424   AddString(FSOpts.WorkingDir, Record);
1425   Stream.EmitRecord(FILE_SYSTEM_OPTIONS, Record);
1426 
1427   // Header search options.
1428   Record.clear();
1429   const HeaderSearchOptions &HSOpts
1430     = PP.getHeaderSearchInfo().getHeaderSearchOpts();
1431   AddString(HSOpts.Sysroot, Record);
1432 
1433   // Include entries.
1434   Record.push_back(HSOpts.UserEntries.size());
1435   for (unsigned I = 0, N = HSOpts.UserEntries.size(); I != N; ++I) {
1436     const HeaderSearchOptions::Entry &Entry = HSOpts.UserEntries[I];
1437     AddString(Entry.Path, Record);
1438     Record.push_back(static_cast<unsigned>(Entry.Group));
1439     Record.push_back(Entry.IsFramework);
1440     Record.push_back(Entry.IgnoreSysRoot);
1441   }
1442 
1443   // System header prefixes.
1444   Record.push_back(HSOpts.SystemHeaderPrefixes.size());
1445   for (unsigned I = 0, N = HSOpts.SystemHeaderPrefixes.size(); I != N; ++I) {
1446     AddString(HSOpts.SystemHeaderPrefixes[I].Prefix, Record);
1447     Record.push_back(HSOpts.SystemHeaderPrefixes[I].IsSystemHeader);
1448   }
1449 
1450   AddString(HSOpts.ResourceDir, Record);
1451   AddString(HSOpts.ModuleCachePath, Record);
1452   AddString(HSOpts.ModuleUserBuildPath, Record);
1453   Record.push_back(HSOpts.DisableModuleHash);
1454   Record.push_back(HSOpts.UseBuiltinIncludes);
1455   Record.push_back(HSOpts.UseStandardSystemIncludes);
1456   Record.push_back(HSOpts.UseStandardCXXIncludes);
1457   Record.push_back(HSOpts.UseLibcxx);
1458   // Write out the specific module cache path that contains the module files.
1459   AddString(PP.getHeaderSearchInfo().getModuleCachePath(), Record);
1460   Stream.EmitRecord(HEADER_SEARCH_OPTIONS, Record);
1461 
1462   // Preprocessor options.
1463   Record.clear();
1464   const PreprocessorOptions &PPOpts = PP.getPreprocessorOpts();
1465 
1466   // Macro definitions.
1467   Record.push_back(PPOpts.Macros.size());
1468   for (unsigned I = 0, N = PPOpts.Macros.size(); I != N; ++I) {
1469     AddString(PPOpts.Macros[I].first, Record);
1470     Record.push_back(PPOpts.Macros[I].second);
1471   }
1472 
1473   // Includes
1474   Record.push_back(PPOpts.Includes.size());
1475   for (unsigned I = 0, N = PPOpts.Includes.size(); I != N; ++I)
1476     AddString(PPOpts.Includes[I], Record);
1477 
1478   // Macro includes
1479   Record.push_back(PPOpts.MacroIncludes.size());
1480   for (unsigned I = 0, N = PPOpts.MacroIncludes.size(); I != N; ++I)
1481     AddString(PPOpts.MacroIncludes[I], Record);
1482 
1483   Record.push_back(PPOpts.UsePredefines);
1484   // Detailed record is important since it is used for the module cache hash.
1485   Record.push_back(PPOpts.DetailedRecord);
1486   AddString(PPOpts.ImplicitPCHInclude, Record);
1487   AddString(PPOpts.ImplicitPTHInclude, Record);
1488   Record.push_back(static_cast<unsigned>(PPOpts.ObjCXXARCStandardLibrary));
1489   Stream.EmitRecord(PREPROCESSOR_OPTIONS, Record);
1490 
1491   // Leave the options block.
1492   Stream.ExitBlock();
1493 
1494   // Original file name and file ID
1495   SourceManager &SM = Context.getSourceManager();
1496   if (const FileEntry *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
1497     auto *FileAbbrev = new BitCodeAbbrev();
1498     FileAbbrev->Add(BitCodeAbbrevOp(ORIGINAL_FILE));
1499     FileAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // File ID
1500     FileAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // File name
1501     unsigned FileAbbrevCode = Stream.EmitAbbrev(FileAbbrev);
1502 
1503     Record.clear();
1504     Record.push_back(ORIGINAL_FILE);
1505     Record.push_back(SM.getMainFileID().getOpaqueValue());
1506     EmitRecordWithPath(FileAbbrevCode, Record, MainFile->getName());
1507   }
1508 
1509   Record.clear();
1510   Record.push_back(SM.getMainFileID().getOpaqueValue());
1511   Stream.EmitRecord(ORIGINAL_FILE_ID, Record);
1512 
1513   // Original PCH directory
1514   if (!OutputFile.empty() && OutputFile != "-") {
1515     auto *Abbrev = new BitCodeAbbrev();
1516     Abbrev->Add(BitCodeAbbrevOp(ORIGINAL_PCH_DIR));
1517     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // File name
1518     unsigned AbbrevCode = Stream.EmitAbbrev(Abbrev);
1519 
1520     SmallString<128> OutputPath(OutputFile);
1521 
1522     SM.getFileManager().makeAbsolutePath(OutputPath);
1523     StringRef origDir = llvm::sys::path::parent_path(OutputPath);
1524 
1525     RecordData::value_type Record[] = {ORIGINAL_PCH_DIR};
1526     Stream.EmitRecordWithBlob(AbbrevCode, Record, origDir);
1527   }
1528 
1529   WriteInputFiles(Context.SourceMgr,
1530                   PP.getHeaderSearchInfo().getHeaderSearchOpts(),
1531                   PP.getLangOpts().Modules);
1532   Stream.ExitBlock();
1533   return Signature;
1534 }
1535 
1536 namespace  {
1537   /// \brief An input file.
1538   struct InputFileEntry {
1539     const FileEntry *File;
1540     bool IsSystemFile;
1541     bool IsTransient;
1542     bool BufferOverridden;
1543   };
1544 } // end anonymous namespace
1545 
WriteInputFiles(SourceManager & SourceMgr,HeaderSearchOptions & HSOpts,bool Modules)1546 void ASTWriter::WriteInputFiles(SourceManager &SourceMgr,
1547                                 HeaderSearchOptions &HSOpts,
1548                                 bool Modules) {
1549   using namespace llvm;
1550   Stream.EnterSubblock(INPUT_FILES_BLOCK_ID, 4);
1551 
1552   // Create input-file abbreviation.
1553   auto *IFAbbrev = new BitCodeAbbrev();
1554   IFAbbrev->Add(BitCodeAbbrevOp(INPUT_FILE));
1555   IFAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ID
1556   IFAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 12)); // Size
1557   IFAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 32)); // Modification time
1558   IFAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Overridden
1559   IFAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Transient
1560   IFAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // File name
1561   unsigned IFAbbrevCode = Stream.EmitAbbrev(IFAbbrev);
1562 
1563   // Get all ContentCache objects for files, sorted by whether the file is a
1564   // system one or not. System files go at the back, users files at the front.
1565   std::deque<InputFileEntry> SortedFiles;
1566   for (unsigned I = 1, N = SourceMgr.local_sloc_entry_size(); I != N; ++I) {
1567     // Get this source location entry.
1568     const SrcMgr::SLocEntry *SLoc = &SourceMgr.getLocalSLocEntry(I);
1569     assert(&SourceMgr.getSLocEntry(FileID::get(I)) == SLoc);
1570 
1571     // We only care about file entries that were not overridden.
1572     if (!SLoc->isFile())
1573       continue;
1574     const SrcMgr::ContentCache *Cache = SLoc->getFile().getContentCache();
1575     if (!Cache->OrigEntry)
1576       continue;
1577 
1578     InputFileEntry Entry;
1579     Entry.File = Cache->OrigEntry;
1580     Entry.IsSystemFile = Cache->IsSystemFile;
1581     Entry.IsTransient = Cache->IsTransient;
1582     Entry.BufferOverridden = Cache->BufferOverridden;
1583     if (Cache->IsSystemFile)
1584       SortedFiles.push_back(Entry);
1585     else
1586       SortedFiles.push_front(Entry);
1587   }
1588 
1589   unsigned UserFilesNum = 0;
1590   // Write out all of the input files.
1591   std::vector<uint64_t> InputFileOffsets;
1592   for (const auto &Entry : SortedFiles) {
1593     uint32_t &InputFileID = InputFileIDs[Entry.File];
1594     if (InputFileID != 0)
1595       continue; // already recorded this file.
1596 
1597     // Record this entry's offset.
1598     InputFileOffsets.push_back(Stream.GetCurrentBitNo());
1599 
1600     InputFileID = InputFileOffsets.size();
1601 
1602     if (!Entry.IsSystemFile)
1603       ++UserFilesNum;
1604 
1605     // Emit size/modification time for this file.
1606     // And whether this file was overridden.
1607     RecordData::value_type Record[] = {
1608         INPUT_FILE,
1609         InputFileOffsets.size(),
1610         (uint64_t)Entry.File->getSize(),
1611         (uint64_t)getTimestampForOutput(Entry.File),
1612         Entry.BufferOverridden,
1613         Entry.IsTransient};
1614 
1615     EmitRecordWithPath(IFAbbrevCode, Record, Entry.File->getName());
1616   }
1617 
1618   Stream.ExitBlock();
1619 
1620   // Create input file offsets abbreviation.
1621   auto *OffsetsAbbrev = new BitCodeAbbrev();
1622   OffsetsAbbrev->Add(BitCodeAbbrevOp(INPUT_FILE_OFFSETS));
1623   OffsetsAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // # input files
1624   OffsetsAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // # non-system
1625                                                                 //   input files
1626   OffsetsAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));   // Array
1627   unsigned OffsetsAbbrevCode = Stream.EmitAbbrev(OffsetsAbbrev);
1628 
1629   // Write input file offsets.
1630   RecordData::value_type Record[] = {INPUT_FILE_OFFSETS,
1631                                      InputFileOffsets.size(), UserFilesNum};
1632   Stream.EmitRecordWithBlob(OffsetsAbbrevCode, Record, bytes(InputFileOffsets));
1633 }
1634 
1635 //===----------------------------------------------------------------------===//
1636 // Source Manager Serialization
1637 //===----------------------------------------------------------------------===//
1638 
1639 /// \brief Create an abbreviation for the SLocEntry that refers to a
1640 /// file.
CreateSLocFileAbbrev(llvm::BitstreamWriter & Stream)1641 static unsigned CreateSLocFileAbbrev(llvm::BitstreamWriter &Stream) {
1642   using namespace llvm;
1643 
1644   auto *Abbrev = new BitCodeAbbrev();
1645   Abbrev->Add(BitCodeAbbrevOp(SM_SLOC_FILE_ENTRY));
1646   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Offset
1647   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Include location
1648   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // Characteristic
1649   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Line directives
1650   // FileEntry fields.
1651   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Input File ID
1652   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // NumCreatedFIDs
1653   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 24)); // FirstDeclIndex
1654   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // NumDecls
1655   return Stream.EmitAbbrev(Abbrev);
1656 }
1657 
1658 /// \brief Create an abbreviation for the SLocEntry that refers to a
1659 /// buffer.
CreateSLocBufferAbbrev(llvm::BitstreamWriter & Stream)1660 static unsigned CreateSLocBufferAbbrev(llvm::BitstreamWriter &Stream) {
1661   using namespace llvm;
1662 
1663   auto *Abbrev = new BitCodeAbbrev();
1664   Abbrev->Add(BitCodeAbbrevOp(SM_SLOC_BUFFER_ENTRY));
1665   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Offset
1666   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Include location
1667   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // Characteristic
1668   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Line directives
1669   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Buffer name blob
1670   return Stream.EmitAbbrev(Abbrev);
1671 }
1672 
1673 /// \brief Create an abbreviation for the SLocEntry that refers to a
1674 /// buffer's blob.
CreateSLocBufferBlobAbbrev(llvm::BitstreamWriter & Stream,bool Compressed)1675 static unsigned CreateSLocBufferBlobAbbrev(llvm::BitstreamWriter &Stream,
1676                                            bool Compressed) {
1677   using namespace llvm;
1678 
1679   auto *Abbrev = new BitCodeAbbrev();
1680   Abbrev->Add(BitCodeAbbrevOp(Compressed ? SM_SLOC_BUFFER_BLOB_COMPRESSED
1681                                          : SM_SLOC_BUFFER_BLOB));
1682   if (Compressed)
1683     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Uncompressed size
1684   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Blob
1685   return Stream.EmitAbbrev(Abbrev);
1686 }
1687 
1688 /// \brief Create an abbreviation for the SLocEntry that refers to a macro
1689 /// expansion.
CreateSLocExpansionAbbrev(llvm::BitstreamWriter & Stream)1690 static unsigned CreateSLocExpansionAbbrev(llvm::BitstreamWriter &Stream) {
1691   using namespace llvm;
1692 
1693   auto *Abbrev = new BitCodeAbbrev();
1694   Abbrev->Add(BitCodeAbbrevOp(SM_SLOC_EXPANSION_ENTRY));
1695   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Offset
1696   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Spelling location
1697   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Start location
1698   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // End location
1699   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Token length
1700   return Stream.EmitAbbrev(Abbrev);
1701 }
1702 
1703 namespace {
1704   // Trait used for the on-disk hash table of header search information.
1705   class HeaderFileInfoTrait {
1706     ASTWriter &Writer;
1707     const HeaderSearch &HS;
1708 
1709     // Keep track of the framework names we've used during serialization.
1710     SmallVector<char, 128> FrameworkStringData;
1711     llvm::StringMap<unsigned> FrameworkNameOffset;
1712 
1713   public:
HeaderFileInfoTrait(ASTWriter & Writer,const HeaderSearch & HS)1714     HeaderFileInfoTrait(ASTWriter &Writer, const HeaderSearch &HS)
1715       : Writer(Writer), HS(HS) { }
1716 
1717     struct key_type {
1718       const FileEntry *FE;
1719       const char *Filename;
1720     };
1721     typedef const key_type &key_type_ref;
1722 
1723     typedef HeaderFileInfo data_type;
1724     typedef const data_type &data_type_ref;
1725     typedef unsigned hash_value_type;
1726     typedef unsigned offset_type;
1727 
ComputeHash(key_type_ref key)1728     hash_value_type ComputeHash(key_type_ref key) {
1729       // The hash is based only on size/time of the file, so that the reader can
1730       // match even when symlinking or excess path elements ("foo/../", "../")
1731       // change the form of the name. However, complete path is still the key.
1732       return llvm::hash_combine(key.FE->getSize(),
1733                                 Writer.getTimestampForOutput(key.FE));
1734     }
1735 
1736     std::pair<unsigned,unsigned>
EmitKeyDataLength(raw_ostream & Out,key_type_ref key,data_type_ref Data)1737     EmitKeyDataLength(raw_ostream& Out, key_type_ref key, data_type_ref Data) {
1738       using namespace llvm::support;
1739       endian::Writer<little> LE(Out);
1740       unsigned KeyLen = strlen(key.Filename) + 1 + 8 + 8;
1741       LE.write<uint16_t>(KeyLen);
1742       unsigned DataLen = 1 + 2 + 4 + 4;
1743       for (auto ModInfo : HS.getModuleMap().findAllModulesForHeader(key.FE))
1744         if (Writer.getLocalOrImportedSubmoduleID(ModInfo.getModule()))
1745           DataLen += 4;
1746       LE.write<uint8_t>(DataLen);
1747       return std::make_pair(KeyLen, DataLen);
1748     }
1749 
EmitKey(raw_ostream & Out,key_type_ref key,unsigned KeyLen)1750     void EmitKey(raw_ostream& Out, key_type_ref key, unsigned KeyLen) {
1751       using namespace llvm::support;
1752       endian::Writer<little> LE(Out);
1753       LE.write<uint64_t>(key.FE->getSize());
1754       KeyLen -= 8;
1755       LE.write<uint64_t>(Writer.getTimestampForOutput(key.FE));
1756       KeyLen -= 8;
1757       Out.write(key.Filename, KeyLen);
1758     }
1759 
EmitData(raw_ostream & Out,key_type_ref key,data_type_ref Data,unsigned DataLen)1760     void EmitData(raw_ostream &Out, key_type_ref key,
1761                   data_type_ref Data, unsigned DataLen) {
1762       using namespace llvm::support;
1763       endian::Writer<little> LE(Out);
1764       uint64_t Start = Out.tell(); (void)Start;
1765 
1766       unsigned char Flags = (Data.isImport << 4)
1767                           | (Data.isPragmaOnce << 3)
1768                           | (Data.DirInfo << 1)
1769                           | Data.IndexHeaderMapHeader;
1770       LE.write<uint8_t>(Flags);
1771       LE.write<uint16_t>(Data.NumIncludes);
1772 
1773       if (!Data.ControllingMacro)
1774         LE.write<uint32_t>(Data.ControllingMacroID);
1775       else
1776         LE.write<uint32_t>(Writer.getIdentifierRef(Data.ControllingMacro));
1777 
1778       unsigned Offset = 0;
1779       if (!Data.Framework.empty()) {
1780         // If this header refers into a framework, save the framework name.
1781         llvm::StringMap<unsigned>::iterator Pos
1782           = FrameworkNameOffset.find(Data.Framework);
1783         if (Pos == FrameworkNameOffset.end()) {
1784           Offset = FrameworkStringData.size() + 1;
1785           FrameworkStringData.append(Data.Framework.begin(),
1786                                      Data.Framework.end());
1787           FrameworkStringData.push_back(0);
1788 
1789           FrameworkNameOffset[Data.Framework] = Offset;
1790         } else
1791           Offset = Pos->second;
1792       }
1793       LE.write<uint32_t>(Offset);
1794 
1795       // FIXME: If the header is excluded, we should write out some
1796       // record of that fact.
1797       for (auto ModInfo : HS.getModuleMap().findAllModulesForHeader(key.FE)) {
1798         if (uint32_t ModID =
1799                 Writer.getLocalOrImportedSubmoduleID(ModInfo.getModule())) {
1800           uint32_t Value = (ModID << 2) | (unsigned)ModInfo.getRole();
1801           assert((Value >> 2) == ModID && "overflow in header module info");
1802           LE.write<uint32_t>(Value);
1803         }
1804       }
1805 
1806       assert(Out.tell() - Start == DataLen && "Wrong data length");
1807     }
1808 
strings_begin() const1809     const char *strings_begin() const { return FrameworkStringData.begin(); }
strings_end() const1810     const char *strings_end() const { return FrameworkStringData.end(); }
1811   };
1812 } // end anonymous namespace
1813 
1814 /// \brief Write the header search block for the list of files that
1815 ///
1816 /// \param HS The header search structure to save.
WriteHeaderSearch(const HeaderSearch & HS)1817 void ASTWriter::WriteHeaderSearch(const HeaderSearch &HS) {
1818   SmallVector<const FileEntry *, 16> FilesByUID;
1819   HS.getFileMgr().GetUniqueIDMapping(FilesByUID);
1820 
1821   if (FilesByUID.size() > HS.header_file_size())
1822     FilesByUID.resize(HS.header_file_size());
1823 
1824   HeaderFileInfoTrait GeneratorTrait(*this, HS);
1825   llvm::OnDiskChainedHashTableGenerator<HeaderFileInfoTrait> Generator;
1826   SmallVector<const char *, 4> SavedStrings;
1827   unsigned NumHeaderSearchEntries = 0;
1828   for (unsigned UID = 0, LastUID = FilesByUID.size(); UID != LastUID; ++UID) {
1829     const FileEntry *File = FilesByUID[UID];
1830     if (!File)
1831       continue;
1832 
1833     // Get the file info. This will load info from the external source if
1834     // necessary. Skip emitting this file if we have no information on it
1835     // as a header file (in which case HFI will be null) or if it hasn't
1836     // changed since it was loaded. Also skip it if it's for a modular header
1837     // from a different module; in that case, we rely on the module(s)
1838     // containing the header to provide this information.
1839     const HeaderFileInfo *HFI =
1840         HS.getExistingFileInfo(File, /*WantExternal*/!Chain);
1841     if (!HFI || (HFI->isModuleHeader && !HFI->isCompilingModuleHeader))
1842       continue;
1843 
1844     // Massage the file path into an appropriate form.
1845     const char *Filename = File->getName();
1846     SmallString<128> FilenameTmp(Filename);
1847     if (PreparePathForOutput(FilenameTmp)) {
1848       // If we performed any translation on the file name at all, we need to
1849       // save this string, since the generator will refer to it later.
1850       Filename = strdup(FilenameTmp.c_str());
1851       SavedStrings.push_back(Filename);
1852     }
1853 
1854     HeaderFileInfoTrait::key_type key = { File, Filename };
1855     Generator.insert(key, *HFI, GeneratorTrait);
1856     ++NumHeaderSearchEntries;
1857   }
1858 
1859   // Create the on-disk hash table in a buffer.
1860   SmallString<4096> TableData;
1861   uint32_t BucketOffset;
1862   {
1863     using namespace llvm::support;
1864     llvm::raw_svector_ostream Out(TableData);
1865     // Make sure that no bucket is at offset 0
1866     endian::Writer<little>(Out).write<uint32_t>(0);
1867     BucketOffset = Generator.Emit(Out, GeneratorTrait);
1868   }
1869 
1870   // Create a blob abbreviation
1871   using namespace llvm;
1872 
1873   auto *Abbrev = new BitCodeAbbrev();
1874   Abbrev->Add(BitCodeAbbrevOp(HEADER_SEARCH_TABLE));
1875   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1876   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1877   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1878   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1879   unsigned TableAbbrev = Stream.EmitAbbrev(Abbrev);
1880 
1881   // Write the header search table
1882   RecordData::value_type Record[] = {HEADER_SEARCH_TABLE, BucketOffset,
1883                                      NumHeaderSearchEntries, TableData.size()};
1884   TableData.append(GeneratorTrait.strings_begin(),GeneratorTrait.strings_end());
1885   Stream.EmitRecordWithBlob(TableAbbrev, Record, TableData);
1886 
1887   // Free all of the strings we had to duplicate.
1888   for (unsigned I = 0, N = SavedStrings.size(); I != N; ++I)
1889     free(const_cast<char *>(SavedStrings[I]));
1890 }
1891 
1892 /// \brief Writes the block containing the serialized form of the
1893 /// source manager.
1894 ///
1895 /// TODO: We should probably use an on-disk hash table (stored in a
1896 /// blob), indexed based on the file name, so that we only create
1897 /// entries for files that we actually need. In the common case (no
1898 /// errors), we probably won't have to create file entries for any of
1899 /// the files in the AST.
WriteSourceManagerBlock(SourceManager & SourceMgr,const Preprocessor & PP)1900 void ASTWriter::WriteSourceManagerBlock(SourceManager &SourceMgr,
1901                                         const Preprocessor &PP) {
1902   RecordData Record;
1903 
1904   // Enter the source manager block.
1905   Stream.EnterSubblock(SOURCE_MANAGER_BLOCK_ID, 4);
1906 
1907   // Abbreviations for the various kinds of source-location entries.
1908   unsigned SLocFileAbbrv = CreateSLocFileAbbrev(Stream);
1909   unsigned SLocBufferAbbrv = CreateSLocBufferAbbrev(Stream);
1910   unsigned SLocBufferBlobAbbrv = CreateSLocBufferBlobAbbrev(Stream, false);
1911   unsigned SLocBufferBlobCompressedAbbrv =
1912       CreateSLocBufferBlobAbbrev(Stream, true);
1913   unsigned SLocExpansionAbbrv = CreateSLocExpansionAbbrev(Stream);
1914 
1915   // Write out the source location entry table. We skip the first
1916   // entry, which is always the same dummy entry.
1917   std::vector<uint32_t> SLocEntryOffsets;
1918   RecordData PreloadSLocs;
1919   SLocEntryOffsets.reserve(SourceMgr.local_sloc_entry_size() - 1);
1920   for (unsigned I = 1, N = SourceMgr.local_sloc_entry_size();
1921        I != N; ++I) {
1922     // Get this source location entry.
1923     const SrcMgr::SLocEntry *SLoc = &SourceMgr.getLocalSLocEntry(I);
1924     FileID FID = FileID::get(I);
1925     assert(&SourceMgr.getSLocEntry(FID) == SLoc);
1926 
1927     // Record the offset of this source-location entry.
1928     SLocEntryOffsets.push_back(Stream.GetCurrentBitNo());
1929 
1930     // Figure out which record code to use.
1931     unsigned Code;
1932     if (SLoc->isFile()) {
1933       const SrcMgr::ContentCache *Cache = SLoc->getFile().getContentCache();
1934       if (Cache->OrigEntry) {
1935         Code = SM_SLOC_FILE_ENTRY;
1936       } else
1937         Code = SM_SLOC_BUFFER_ENTRY;
1938     } else
1939       Code = SM_SLOC_EXPANSION_ENTRY;
1940     Record.clear();
1941     Record.push_back(Code);
1942 
1943     // Starting offset of this entry within this module, so skip the dummy.
1944     Record.push_back(SLoc->getOffset() - 2);
1945     if (SLoc->isFile()) {
1946       const SrcMgr::FileInfo &File = SLoc->getFile();
1947       AddSourceLocation(File.getIncludeLoc(), Record);
1948       Record.push_back(File.getFileCharacteristic()); // FIXME: stable encoding
1949       Record.push_back(File.hasLineDirectives());
1950 
1951       const SrcMgr::ContentCache *Content = File.getContentCache();
1952       bool EmitBlob = false;
1953       if (Content->OrigEntry) {
1954         assert(Content->OrigEntry == Content->ContentsEntry &&
1955                "Writing to AST an overridden file is not supported");
1956 
1957         // The source location entry is a file. Emit input file ID.
1958         assert(InputFileIDs[Content->OrigEntry] != 0 && "Missed file entry");
1959         Record.push_back(InputFileIDs[Content->OrigEntry]);
1960 
1961         Record.push_back(File.NumCreatedFIDs);
1962 
1963         FileDeclIDsTy::iterator FDI = FileDeclIDs.find(FID);
1964         if (FDI != FileDeclIDs.end()) {
1965           Record.push_back(FDI->second->FirstDeclIndex);
1966           Record.push_back(FDI->second->DeclIDs.size());
1967         } else {
1968           Record.push_back(0);
1969           Record.push_back(0);
1970         }
1971 
1972         Stream.EmitRecordWithAbbrev(SLocFileAbbrv, Record);
1973 
1974         if (Content->BufferOverridden || Content->IsTransient)
1975           EmitBlob = true;
1976       } else {
1977         // The source location entry is a buffer. The blob associated
1978         // with this entry contains the contents of the buffer.
1979 
1980         // We add one to the size so that we capture the trailing NULL
1981         // that is required by llvm::MemoryBuffer::getMemBuffer (on
1982         // the reader side).
1983         const llvm::MemoryBuffer *Buffer
1984           = Content->getBuffer(PP.getDiagnostics(), PP.getSourceManager());
1985         const char *Name = Buffer->getBufferIdentifier();
1986         Stream.EmitRecordWithBlob(SLocBufferAbbrv, Record,
1987                                   StringRef(Name, strlen(Name) + 1));
1988         EmitBlob = true;
1989 
1990         if (strcmp(Name, "<built-in>") == 0) {
1991           PreloadSLocs.push_back(SLocEntryOffsets.size());
1992         }
1993       }
1994 
1995       if (EmitBlob) {
1996         // Include the implicit terminating null character in the on-disk buffer
1997         // if we're writing it uncompressed.
1998         const llvm::MemoryBuffer *Buffer =
1999             Content->getBuffer(PP.getDiagnostics(), PP.getSourceManager());
2000         StringRef Blob(Buffer->getBufferStart(), Buffer->getBufferSize() + 1);
2001 
2002         // Compress the buffer if possible. We expect that almost all PCM
2003         // consumers will not want its contents.
2004         SmallString<0> CompressedBuffer;
2005         if (llvm::zlib::compress(Blob.drop_back(1), CompressedBuffer) ==
2006             llvm::zlib::StatusOK) {
2007           RecordData::value_type Record[] = {SM_SLOC_BUFFER_BLOB_COMPRESSED,
2008                                              Blob.size() - 1};
2009           Stream.EmitRecordWithBlob(SLocBufferBlobCompressedAbbrv, Record,
2010                                     CompressedBuffer);
2011         } else {
2012           RecordData::value_type Record[] = {SM_SLOC_BUFFER_BLOB};
2013           Stream.EmitRecordWithBlob(SLocBufferBlobAbbrv, Record, Blob);
2014         }
2015       }
2016     } else {
2017       // The source location entry is a macro expansion.
2018       const SrcMgr::ExpansionInfo &Expansion = SLoc->getExpansion();
2019       AddSourceLocation(Expansion.getSpellingLoc(), Record);
2020       AddSourceLocation(Expansion.getExpansionLocStart(), Record);
2021       AddSourceLocation(Expansion.isMacroArgExpansion()
2022                             ? SourceLocation()
2023                             : Expansion.getExpansionLocEnd(),
2024                         Record);
2025 
2026       // Compute the token length for this macro expansion.
2027       unsigned NextOffset = SourceMgr.getNextLocalOffset();
2028       if (I + 1 != N)
2029         NextOffset = SourceMgr.getLocalSLocEntry(I + 1).getOffset();
2030       Record.push_back(NextOffset - SLoc->getOffset() - 1);
2031       Stream.EmitRecordWithAbbrev(SLocExpansionAbbrv, Record);
2032     }
2033   }
2034 
2035   Stream.ExitBlock();
2036 
2037   if (SLocEntryOffsets.empty())
2038     return;
2039 
2040   // Write the source-location offsets table into the AST block. This
2041   // table is used for lazily loading source-location information.
2042   using namespace llvm;
2043 
2044   auto *Abbrev = new BitCodeAbbrev();
2045   Abbrev->Add(BitCodeAbbrevOp(SOURCE_LOCATION_OFFSETS));
2046   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 16)); // # of slocs
2047   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 16)); // total size
2048   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // offsets
2049   unsigned SLocOffsetsAbbrev = Stream.EmitAbbrev(Abbrev);
2050   {
2051     RecordData::value_type Record[] = {
2052         SOURCE_LOCATION_OFFSETS, SLocEntryOffsets.size(),
2053         SourceMgr.getNextLocalOffset() - 1 /* skip dummy */};
2054     Stream.EmitRecordWithBlob(SLocOffsetsAbbrev, Record,
2055                               bytes(SLocEntryOffsets));
2056   }
2057   // Write the source location entry preloads array, telling the AST
2058   // reader which source locations entries it should load eagerly.
2059   Stream.EmitRecord(SOURCE_LOCATION_PRELOADS, PreloadSLocs);
2060 
2061   // Write the line table. It depends on remapping working, so it must come
2062   // after the source location offsets.
2063   if (SourceMgr.hasLineTable()) {
2064     LineTableInfo &LineTable = SourceMgr.getLineTable();
2065 
2066     Record.clear();
2067 
2068     // Emit the needed file names.
2069     llvm::DenseMap<int, int> FilenameMap;
2070     for (const auto &L : LineTable) {
2071       if (L.first.ID < 0)
2072         continue;
2073       for (auto &LE : L.second) {
2074         if (FilenameMap.insert(std::make_pair(LE.FilenameID,
2075                                               FilenameMap.size())).second)
2076           AddPath(LineTable.getFilename(LE.FilenameID), Record);
2077       }
2078     }
2079     Record.push_back(0);
2080 
2081     // Emit the line entries
2082     for (const auto &L : LineTable) {
2083       // Only emit entries for local files.
2084       if (L.first.ID < 0)
2085         continue;
2086 
2087       // Emit the file ID
2088       Record.push_back(L.first.ID);
2089 
2090       // Emit the line entries
2091       Record.push_back(L.second.size());
2092       for (const auto &LE : L.second) {
2093         Record.push_back(LE.FileOffset);
2094         Record.push_back(LE.LineNo);
2095         Record.push_back(FilenameMap[LE.FilenameID]);
2096         Record.push_back((unsigned)LE.FileKind);
2097         Record.push_back(LE.IncludeOffset);
2098       }
2099     }
2100 
2101     Stream.EmitRecord(SOURCE_MANAGER_LINE_TABLE, Record);
2102   }
2103 }
2104 
2105 //===----------------------------------------------------------------------===//
2106 // Preprocessor Serialization
2107 //===----------------------------------------------------------------------===//
2108 
shouldIgnoreMacro(MacroDirective * MD,bool IsModule,const Preprocessor & PP)2109 static bool shouldIgnoreMacro(MacroDirective *MD, bool IsModule,
2110                               const Preprocessor &PP) {
2111   if (MacroInfo *MI = MD->getMacroInfo())
2112     if (MI->isBuiltinMacro())
2113       return true;
2114 
2115   if (IsModule) {
2116     SourceLocation Loc = MD->getLocation();
2117     if (Loc.isInvalid())
2118       return true;
2119     if (PP.getSourceManager().getFileID(Loc) == PP.getPredefinesFileID())
2120       return true;
2121   }
2122 
2123   return false;
2124 }
2125 
2126 /// \brief Writes the block containing the serialized form of the
2127 /// preprocessor.
2128 ///
WritePreprocessor(const Preprocessor & PP,bool IsModule)2129 void ASTWriter::WritePreprocessor(const Preprocessor &PP, bool IsModule) {
2130   PreprocessingRecord *PPRec = PP.getPreprocessingRecord();
2131   if (PPRec)
2132     WritePreprocessorDetail(*PPRec);
2133 
2134   RecordData Record;
2135   RecordData ModuleMacroRecord;
2136 
2137   // If the preprocessor __COUNTER__ value has been bumped, remember it.
2138   if (PP.getCounterValue() != 0) {
2139     RecordData::value_type Record[] = {PP.getCounterValue()};
2140     Stream.EmitRecord(PP_COUNTER_VALUE, Record);
2141   }
2142 
2143   // Enter the preprocessor block.
2144   Stream.EnterSubblock(PREPROCESSOR_BLOCK_ID, 3);
2145 
2146   // If the AST file contains __DATE__ or __TIME__ emit a warning about this.
2147   // FIXME: Include a location for the use, and say which one was used.
2148   if (PP.SawDateOrTime())
2149     PP.Diag(SourceLocation(), diag::warn_module_uses_date_time) << IsModule;
2150 
2151   // Loop over all the macro directives that are live at the end of the file,
2152   // emitting each to the PP section.
2153 
2154   // Construct the list of identifiers with macro directives that need to be
2155   // serialized.
2156   SmallVector<const IdentifierInfo *, 128> MacroIdentifiers;
2157   for (auto &Id : PP.getIdentifierTable())
2158     if (Id.second->hadMacroDefinition() &&
2159         (!Id.second->isFromAST() ||
2160          Id.second->hasChangedSinceDeserialization()))
2161       MacroIdentifiers.push_back(Id.second);
2162   // Sort the set of macro definitions that need to be serialized by the
2163   // name of the macro, to provide a stable ordering.
2164   std::sort(MacroIdentifiers.begin(), MacroIdentifiers.end(),
2165             llvm::less_ptr<IdentifierInfo>());
2166 
2167   // Emit the macro directives as a list and associate the offset with the
2168   // identifier they belong to.
2169   for (const IdentifierInfo *Name : MacroIdentifiers) {
2170     MacroDirective *MD = PP.getLocalMacroDirectiveHistory(Name);
2171     auto StartOffset = Stream.GetCurrentBitNo();
2172 
2173     // Emit the macro directives in reverse source order.
2174     for (; MD; MD = MD->getPrevious()) {
2175       // Once we hit an ignored macro, we're done: the rest of the chain
2176       // will all be ignored macros.
2177       if (shouldIgnoreMacro(MD, IsModule, PP))
2178         break;
2179 
2180       AddSourceLocation(MD->getLocation(), Record);
2181       Record.push_back(MD->getKind());
2182       if (auto *DefMD = dyn_cast<DefMacroDirective>(MD)) {
2183         Record.push_back(getMacroRef(DefMD->getInfo(), Name));
2184       } else if (auto *VisMD = dyn_cast<VisibilityMacroDirective>(MD)) {
2185         Record.push_back(VisMD->isPublic());
2186       }
2187     }
2188 
2189     // Write out any exported module macros.
2190     bool EmittedModuleMacros = false;
2191     // We write out exported module macros for PCH as well.
2192     auto Leafs = PP.getLeafModuleMacros(Name);
2193     SmallVector<ModuleMacro*, 8> Worklist(Leafs.begin(), Leafs.end());
2194     llvm::DenseMap<ModuleMacro*, unsigned> Visits;
2195     while (!Worklist.empty()) {
2196       auto *Macro = Worklist.pop_back_val();
2197 
2198       // Emit a record indicating this submodule exports this macro.
2199       ModuleMacroRecord.push_back(
2200           getSubmoduleID(Macro->getOwningModule()));
2201       ModuleMacroRecord.push_back(getMacroRef(Macro->getMacroInfo(), Name));
2202       for (auto *M : Macro->overrides())
2203         ModuleMacroRecord.push_back(getSubmoduleID(M->getOwningModule()));
2204 
2205       Stream.EmitRecord(PP_MODULE_MACRO, ModuleMacroRecord);
2206       ModuleMacroRecord.clear();
2207 
2208       // Enqueue overridden macros once we've visited all their ancestors.
2209       for (auto *M : Macro->overrides())
2210         if (++Visits[M] == M->getNumOverridingMacros())
2211           Worklist.push_back(M);
2212 
2213       EmittedModuleMacros = true;
2214     }
2215 
2216     if (Record.empty() && !EmittedModuleMacros)
2217       continue;
2218 
2219     IdentMacroDirectivesOffsetMap[Name] = StartOffset;
2220     Stream.EmitRecord(PP_MACRO_DIRECTIVE_HISTORY, Record);
2221     Record.clear();
2222   }
2223 
2224   /// \brief Offsets of each of the macros into the bitstream, indexed by
2225   /// the local macro ID
2226   ///
2227   /// For each identifier that is associated with a macro, this map
2228   /// provides the offset into the bitstream where that macro is
2229   /// defined.
2230   std::vector<uint32_t> MacroOffsets;
2231 
2232   for (unsigned I = 0, N = MacroInfosToEmit.size(); I != N; ++I) {
2233     const IdentifierInfo *Name = MacroInfosToEmit[I].Name;
2234     MacroInfo *MI = MacroInfosToEmit[I].MI;
2235     MacroID ID = MacroInfosToEmit[I].ID;
2236 
2237     if (ID < FirstMacroID) {
2238       assert(0 && "Loaded MacroInfo entered MacroInfosToEmit ?");
2239       continue;
2240     }
2241 
2242     // Record the local offset of this macro.
2243     unsigned Index = ID - FirstMacroID;
2244     if (Index == MacroOffsets.size())
2245       MacroOffsets.push_back(Stream.GetCurrentBitNo());
2246     else {
2247       if (Index > MacroOffsets.size())
2248         MacroOffsets.resize(Index + 1);
2249 
2250       MacroOffsets[Index] = Stream.GetCurrentBitNo();
2251     }
2252 
2253     AddIdentifierRef(Name, Record);
2254     Record.push_back(inferSubmoduleIDFromLocation(MI->getDefinitionLoc()));
2255     AddSourceLocation(MI->getDefinitionLoc(), Record);
2256     AddSourceLocation(MI->getDefinitionEndLoc(), Record);
2257     Record.push_back(MI->isUsed());
2258     Record.push_back(MI->isUsedForHeaderGuard());
2259     unsigned Code;
2260     if (MI->isObjectLike()) {
2261       Code = PP_MACRO_OBJECT_LIKE;
2262     } else {
2263       Code = PP_MACRO_FUNCTION_LIKE;
2264 
2265       Record.push_back(MI->isC99Varargs());
2266       Record.push_back(MI->isGNUVarargs());
2267       Record.push_back(MI->hasCommaPasting());
2268       Record.push_back(MI->getNumArgs());
2269       for (const IdentifierInfo *Arg : MI->args())
2270         AddIdentifierRef(Arg, Record);
2271     }
2272 
2273     // If we have a detailed preprocessing record, record the macro definition
2274     // ID that corresponds to this macro.
2275     if (PPRec)
2276       Record.push_back(MacroDefinitions[PPRec->findMacroDefinition(MI)]);
2277 
2278     Stream.EmitRecord(Code, Record);
2279     Record.clear();
2280 
2281     // Emit the tokens array.
2282     for (unsigned TokNo = 0, e = MI->getNumTokens(); TokNo != e; ++TokNo) {
2283       // Note that we know that the preprocessor does not have any annotation
2284       // tokens in it because they are created by the parser, and thus can't
2285       // be in a macro definition.
2286       const Token &Tok = MI->getReplacementToken(TokNo);
2287       AddToken(Tok, Record);
2288       Stream.EmitRecord(PP_TOKEN, Record);
2289       Record.clear();
2290     }
2291     ++NumMacros;
2292   }
2293 
2294   Stream.ExitBlock();
2295 
2296   // Write the offsets table for macro IDs.
2297   using namespace llvm;
2298 
2299   auto *Abbrev = new BitCodeAbbrev();
2300   Abbrev->Add(BitCodeAbbrevOp(MACRO_OFFSET));
2301   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // # of macros
2302   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // first ID
2303   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2304 
2305   unsigned MacroOffsetAbbrev = Stream.EmitAbbrev(Abbrev);
2306   {
2307     RecordData::value_type Record[] = {MACRO_OFFSET, MacroOffsets.size(),
2308                                        FirstMacroID - NUM_PREDEF_MACRO_IDS};
2309     Stream.EmitRecordWithBlob(MacroOffsetAbbrev, Record, bytes(MacroOffsets));
2310   }
2311 }
2312 
WritePreprocessorDetail(PreprocessingRecord & PPRec)2313 void ASTWriter::WritePreprocessorDetail(PreprocessingRecord &PPRec) {
2314   if (PPRec.local_begin() == PPRec.local_end())
2315     return;
2316 
2317   SmallVector<PPEntityOffset, 64> PreprocessedEntityOffsets;
2318 
2319   // Enter the preprocessor block.
2320   Stream.EnterSubblock(PREPROCESSOR_DETAIL_BLOCK_ID, 3);
2321 
2322   // If the preprocessor has a preprocessing record, emit it.
2323   unsigned NumPreprocessingRecords = 0;
2324   using namespace llvm;
2325 
2326   // Set up the abbreviation for
2327   unsigned InclusionAbbrev = 0;
2328   {
2329     auto *Abbrev = new BitCodeAbbrev();
2330     Abbrev->Add(BitCodeAbbrevOp(PPD_INCLUSION_DIRECTIVE));
2331     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // filename length
2332     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // in quotes
2333     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // kind
2334     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // imported module
2335     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2336     InclusionAbbrev = Stream.EmitAbbrev(Abbrev);
2337   }
2338 
2339   unsigned FirstPreprocessorEntityID
2340     = (Chain ? PPRec.getNumLoadedPreprocessedEntities() : 0)
2341     + NUM_PREDEF_PP_ENTITY_IDS;
2342   unsigned NextPreprocessorEntityID = FirstPreprocessorEntityID;
2343   RecordData Record;
2344   for (PreprocessingRecord::iterator E = PPRec.local_begin(),
2345                                   EEnd = PPRec.local_end();
2346        E != EEnd;
2347        (void)++E, ++NumPreprocessingRecords, ++NextPreprocessorEntityID) {
2348     Record.clear();
2349 
2350     PreprocessedEntityOffsets.push_back(
2351         PPEntityOffset((*E)->getSourceRange(), Stream.GetCurrentBitNo()));
2352 
2353     if (auto *MD = dyn_cast<MacroDefinitionRecord>(*E)) {
2354       // Record this macro definition's ID.
2355       MacroDefinitions[MD] = NextPreprocessorEntityID;
2356 
2357       AddIdentifierRef(MD->getName(), Record);
2358       Stream.EmitRecord(PPD_MACRO_DEFINITION, Record);
2359       continue;
2360     }
2361 
2362     if (auto *ME = dyn_cast<MacroExpansion>(*E)) {
2363       Record.push_back(ME->isBuiltinMacro());
2364       if (ME->isBuiltinMacro())
2365         AddIdentifierRef(ME->getName(), Record);
2366       else
2367         Record.push_back(MacroDefinitions[ME->getDefinition()]);
2368       Stream.EmitRecord(PPD_MACRO_EXPANSION, Record);
2369       continue;
2370     }
2371 
2372     if (auto *ID = dyn_cast<InclusionDirective>(*E)) {
2373       Record.push_back(PPD_INCLUSION_DIRECTIVE);
2374       Record.push_back(ID->getFileName().size());
2375       Record.push_back(ID->wasInQuotes());
2376       Record.push_back(static_cast<unsigned>(ID->getKind()));
2377       Record.push_back(ID->importedModule());
2378       SmallString<64> Buffer;
2379       Buffer += ID->getFileName();
2380       // Check that the FileEntry is not null because it was not resolved and
2381       // we create a PCH even with compiler errors.
2382       if (ID->getFile())
2383         Buffer += ID->getFile()->getName();
2384       Stream.EmitRecordWithBlob(InclusionAbbrev, Record, Buffer);
2385       continue;
2386     }
2387 
2388     llvm_unreachable("Unhandled PreprocessedEntity in ASTWriter");
2389   }
2390   Stream.ExitBlock();
2391 
2392   // Write the offsets table for the preprocessing record.
2393   if (NumPreprocessingRecords > 0) {
2394     assert(PreprocessedEntityOffsets.size() == NumPreprocessingRecords);
2395 
2396     // Write the offsets table for identifier IDs.
2397     using namespace llvm;
2398 
2399     auto *Abbrev = new BitCodeAbbrev();
2400     Abbrev->Add(BitCodeAbbrevOp(PPD_ENTITIES_OFFSETS));
2401     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // first pp entity
2402     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2403     unsigned PPEOffsetAbbrev = Stream.EmitAbbrev(Abbrev);
2404 
2405     RecordData::value_type Record[] = {PPD_ENTITIES_OFFSETS,
2406                                        FirstPreprocessorEntityID -
2407                                            NUM_PREDEF_PP_ENTITY_IDS};
2408     Stream.EmitRecordWithBlob(PPEOffsetAbbrev, Record,
2409                               bytes(PreprocessedEntityOffsets));
2410   }
2411 }
2412 
getLocalOrImportedSubmoduleID(Module * Mod)2413 unsigned ASTWriter::getLocalOrImportedSubmoduleID(Module *Mod) {
2414   if (!Mod)
2415     return 0;
2416 
2417   llvm::DenseMap<Module *, unsigned>::iterator Known = SubmoduleIDs.find(Mod);
2418   if (Known != SubmoduleIDs.end())
2419     return Known->second;
2420 
2421   if (Mod->getTopLevelModule() != WritingModule)
2422     return 0;
2423 
2424   return SubmoduleIDs[Mod] = NextSubmoduleID++;
2425 }
2426 
getSubmoduleID(Module * Mod)2427 unsigned ASTWriter::getSubmoduleID(Module *Mod) {
2428   // FIXME: This can easily happen, if we have a reference to a submodule that
2429   // did not result in us loading a module file for that submodule. For
2430   // instance, a cross-top-level-module 'conflict' declaration will hit this.
2431   unsigned ID = getLocalOrImportedSubmoduleID(Mod);
2432   assert((ID || !Mod) &&
2433          "asked for module ID for non-local, non-imported module");
2434   return ID;
2435 }
2436 
2437 /// \brief Compute the number of modules within the given tree (including the
2438 /// given module).
getNumberOfModules(Module * Mod)2439 static unsigned getNumberOfModules(Module *Mod) {
2440   unsigned ChildModules = 0;
2441   for (auto Sub = Mod->submodule_begin(), SubEnd = Mod->submodule_end();
2442        Sub != SubEnd; ++Sub)
2443     ChildModules += getNumberOfModules(*Sub);
2444 
2445   return ChildModules + 1;
2446 }
2447 
WriteSubmodules(Module * WritingModule)2448 void ASTWriter::WriteSubmodules(Module *WritingModule) {
2449   // Enter the submodule description block.
2450   Stream.EnterSubblock(SUBMODULE_BLOCK_ID, /*bits for abbreviations*/5);
2451 
2452   // Write the abbreviations needed for the submodules block.
2453   using namespace llvm;
2454 
2455   auto *Abbrev = new BitCodeAbbrev();
2456   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_DEFINITION));
2457   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ID
2458   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Parent
2459   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFramework
2460   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsExplicit
2461   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsSystem
2462   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsExternC
2463   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InferSubmodules...
2464   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InferExplicit...
2465   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InferExportWild...
2466   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ConfigMacrosExh...
2467   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
2468   unsigned DefinitionAbbrev = Stream.EmitAbbrev(Abbrev);
2469 
2470   Abbrev = new BitCodeAbbrev();
2471   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_UMBRELLA_HEADER));
2472   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
2473   unsigned UmbrellaAbbrev = Stream.EmitAbbrev(Abbrev);
2474 
2475   Abbrev = new BitCodeAbbrev();
2476   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_HEADER));
2477   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
2478   unsigned HeaderAbbrev = Stream.EmitAbbrev(Abbrev);
2479 
2480   Abbrev = new BitCodeAbbrev();
2481   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_TOPHEADER));
2482   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
2483   unsigned TopHeaderAbbrev = Stream.EmitAbbrev(Abbrev);
2484 
2485   Abbrev = new BitCodeAbbrev();
2486   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_UMBRELLA_DIR));
2487   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
2488   unsigned UmbrellaDirAbbrev = Stream.EmitAbbrev(Abbrev);
2489 
2490   Abbrev = new BitCodeAbbrev();
2491   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_REQUIRES));
2492   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // State
2493   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));     // Feature
2494   unsigned RequiresAbbrev = Stream.EmitAbbrev(Abbrev);
2495 
2496   Abbrev = new BitCodeAbbrev();
2497   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_EXCLUDED_HEADER));
2498   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
2499   unsigned ExcludedHeaderAbbrev = Stream.EmitAbbrev(Abbrev);
2500 
2501   Abbrev = new BitCodeAbbrev();
2502   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_TEXTUAL_HEADER));
2503   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
2504   unsigned TextualHeaderAbbrev = Stream.EmitAbbrev(Abbrev);
2505 
2506   Abbrev = new BitCodeAbbrev();
2507   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_PRIVATE_HEADER));
2508   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
2509   unsigned PrivateHeaderAbbrev = Stream.EmitAbbrev(Abbrev);
2510 
2511   Abbrev = new BitCodeAbbrev();
2512   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_PRIVATE_TEXTUAL_HEADER));
2513   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
2514   unsigned PrivateTextualHeaderAbbrev = Stream.EmitAbbrev(Abbrev);
2515 
2516   Abbrev = new BitCodeAbbrev();
2517   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_LINK_LIBRARY));
2518   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFramework
2519   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));     // Name
2520   unsigned LinkLibraryAbbrev = Stream.EmitAbbrev(Abbrev);
2521 
2522   Abbrev = new BitCodeAbbrev();
2523   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_CONFIG_MACRO));
2524   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));    // Macro name
2525   unsigned ConfigMacroAbbrev = Stream.EmitAbbrev(Abbrev);
2526 
2527   Abbrev = new BitCodeAbbrev();
2528   Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_CONFLICT));
2529   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));  // Other module
2530   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));    // Message
2531   unsigned ConflictAbbrev = Stream.EmitAbbrev(Abbrev);
2532 
2533   // Write the submodule metadata block.
2534   RecordData::value_type Record[] = {getNumberOfModules(WritingModule),
2535                                      FirstSubmoduleID -
2536                                          NUM_PREDEF_SUBMODULE_IDS};
2537   Stream.EmitRecord(SUBMODULE_METADATA, Record);
2538 
2539   // Write all of the submodules.
2540   std::queue<Module *> Q;
2541   Q.push(WritingModule);
2542   while (!Q.empty()) {
2543     Module *Mod = Q.front();
2544     Q.pop();
2545     unsigned ID = getSubmoduleID(Mod);
2546 
2547     uint64_t ParentID = 0;
2548     if (Mod->Parent) {
2549       assert(SubmoduleIDs[Mod->Parent] && "Submodule parent not written?");
2550       ParentID = SubmoduleIDs[Mod->Parent];
2551     }
2552 
2553     // Emit the definition of the block.
2554     {
2555       RecordData::value_type Record[] = {
2556           SUBMODULE_DEFINITION, ID, ParentID, Mod->IsFramework, Mod->IsExplicit,
2557           Mod->IsSystem, Mod->IsExternC, Mod->InferSubmodules,
2558           Mod->InferExplicitSubmodules, Mod->InferExportWildcard,
2559           Mod->ConfigMacrosExhaustive};
2560       Stream.EmitRecordWithBlob(DefinitionAbbrev, Record, Mod->Name);
2561     }
2562 
2563     // Emit the requirements.
2564     for (const auto &R : Mod->Requirements) {
2565       RecordData::value_type Record[] = {SUBMODULE_REQUIRES, R.second};
2566       Stream.EmitRecordWithBlob(RequiresAbbrev, Record, R.first);
2567     }
2568 
2569     // Emit the umbrella header, if there is one.
2570     if (auto UmbrellaHeader = Mod->getUmbrellaHeader()) {
2571       RecordData::value_type Record[] = {SUBMODULE_UMBRELLA_HEADER};
2572       Stream.EmitRecordWithBlob(UmbrellaAbbrev, Record,
2573                                 UmbrellaHeader.NameAsWritten);
2574     } else if (auto UmbrellaDir = Mod->getUmbrellaDir()) {
2575       RecordData::value_type Record[] = {SUBMODULE_UMBRELLA_DIR};
2576       Stream.EmitRecordWithBlob(UmbrellaDirAbbrev, Record,
2577                                 UmbrellaDir.NameAsWritten);
2578     }
2579 
2580     // Emit the headers.
2581     struct {
2582       unsigned RecordKind;
2583       unsigned Abbrev;
2584       Module::HeaderKind HeaderKind;
2585     } HeaderLists[] = {
2586       {SUBMODULE_HEADER, HeaderAbbrev, Module::HK_Normal},
2587       {SUBMODULE_TEXTUAL_HEADER, TextualHeaderAbbrev, Module::HK_Textual},
2588       {SUBMODULE_PRIVATE_HEADER, PrivateHeaderAbbrev, Module::HK_Private},
2589       {SUBMODULE_PRIVATE_TEXTUAL_HEADER, PrivateTextualHeaderAbbrev,
2590         Module::HK_PrivateTextual},
2591       {SUBMODULE_EXCLUDED_HEADER, ExcludedHeaderAbbrev, Module::HK_Excluded}
2592     };
2593     for (auto &HL : HeaderLists) {
2594       RecordData::value_type Record[] = {HL.RecordKind};
2595       for (auto &H : Mod->Headers[HL.HeaderKind])
2596         Stream.EmitRecordWithBlob(HL.Abbrev, Record, H.NameAsWritten);
2597     }
2598 
2599     // Emit the top headers.
2600     {
2601       auto TopHeaders = Mod->getTopHeaders(PP->getFileManager());
2602       RecordData::value_type Record[] = {SUBMODULE_TOPHEADER};
2603       for (auto *H : TopHeaders)
2604         Stream.EmitRecordWithBlob(TopHeaderAbbrev, Record, H->getName());
2605     }
2606 
2607     // Emit the imports.
2608     if (!Mod->Imports.empty()) {
2609       RecordData Record;
2610       for (auto *I : Mod->Imports)
2611         Record.push_back(getSubmoduleID(I));
2612       Stream.EmitRecord(SUBMODULE_IMPORTS, Record);
2613     }
2614 
2615     // Emit the exports.
2616     if (!Mod->Exports.empty()) {
2617       RecordData Record;
2618       for (const auto &E : Mod->Exports) {
2619         // FIXME: This may fail; we don't require that all exported modules
2620         // are local or imported.
2621         Record.push_back(getSubmoduleID(E.getPointer()));
2622         Record.push_back(E.getInt());
2623       }
2624       Stream.EmitRecord(SUBMODULE_EXPORTS, Record);
2625     }
2626 
2627     //FIXME: How do we emit the 'use'd modules?  They may not be submodules.
2628     // Might be unnecessary as use declarations are only used to build the
2629     // module itself.
2630 
2631     // Emit the link libraries.
2632     for (const auto &LL : Mod->LinkLibraries) {
2633       RecordData::value_type Record[] = {SUBMODULE_LINK_LIBRARY,
2634                                          LL.IsFramework};
2635       Stream.EmitRecordWithBlob(LinkLibraryAbbrev, Record, LL.Library);
2636     }
2637 
2638     // Emit the conflicts.
2639     for (const auto &C : Mod->Conflicts) {
2640       // FIXME: This may fail; we don't require that all conflicting modules
2641       // are local or imported.
2642       RecordData::value_type Record[] = {SUBMODULE_CONFLICT,
2643                                          getSubmoduleID(C.Other)};
2644       Stream.EmitRecordWithBlob(ConflictAbbrev, Record, C.Message);
2645     }
2646 
2647     // Emit the configuration macros.
2648     for (const auto &CM : Mod->ConfigMacros) {
2649       RecordData::value_type Record[] = {SUBMODULE_CONFIG_MACRO};
2650       Stream.EmitRecordWithBlob(ConfigMacroAbbrev, Record, CM);
2651     }
2652 
2653     // Queue up the submodules of this module.
2654     for (auto *M : Mod->submodules())
2655       Q.push(M);
2656   }
2657 
2658   Stream.ExitBlock();
2659 
2660   assert((NextSubmoduleID - FirstSubmoduleID ==
2661           getNumberOfModules(WritingModule)) &&
2662          "Wrong # of submodules; found a reference to a non-local, "
2663          "non-imported submodule?");
2664 }
2665 
2666 serialization::SubmoduleID
inferSubmoduleIDFromLocation(SourceLocation Loc)2667 ASTWriter::inferSubmoduleIDFromLocation(SourceLocation Loc) {
2668   if (Loc.isInvalid() || !WritingModule)
2669     return 0; // No submodule
2670 
2671   // Find the module that owns this location.
2672   ModuleMap &ModMap = PP->getHeaderSearchInfo().getModuleMap();
2673   Module *OwningMod
2674     = ModMap.inferModuleFromLocation(FullSourceLoc(Loc,PP->getSourceManager()));
2675   if (!OwningMod)
2676     return 0;
2677 
2678   // Check whether this submodule is part of our own module.
2679   if (WritingModule != OwningMod && !OwningMod->isSubModuleOf(WritingModule))
2680     return 0;
2681 
2682   return getSubmoduleID(OwningMod);
2683 }
2684 
WritePragmaDiagnosticMappings(const DiagnosticsEngine & Diag,bool isModule)2685 void ASTWriter::WritePragmaDiagnosticMappings(const DiagnosticsEngine &Diag,
2686                                               bool isModule) {
2687   // Make sure set diagnostic pragmas don't affect the translation unit that
2688   // imports the module.
2689   // FIXME: Make diagnostic pragma sections work properly with modules.
2690   if (isModule)
2691     return;
2692 
2693   llvm::SmallDenseMap<const DiagnosticsEngine::DiagState *, unsigned, 64>
2694       DiagStateIDMap;
2695   unsigned CurrID = 0;
2696   DiagStateIDMap[&Diag.DiagStates.front()] = ++CurrID; // the command-line one.
2697   RecordData Record;
2698   for (DiagnosticsEngine::DiagStatePointsTy::const_iterator
2699          I = Diag.DiagStatePoints.begin(), E = Diag.DiagStatePoints.end();
2700          I != E; ++I) {
2701     const DiagnosticsEngine::DiagStatePoint &point = *I;
2702     if (point.Loc.isInvalid())
2703       continue;
2704 
2705     AddSourceLocation(point.Loc, Record);
2706     unsigned &DiagStateID = DiagStateIDMap[point.State];
2707     Record.push_back(DiagStateID);
2708 
2709     if (DiagStateID == 0) {
2710       DiagStateID = ++CurrID;
2711       for (const auto &I : *(point.State)) {
2712         if (I.second.isPragma()) {
2713           Record.push_back(I.first);
2714           Record.push_back((unsigned)I.second.getSeverity());
2715         }
2716       }
2717       Record.push_back(-1); // mark the end of the diag/map pairs for this
2718                             // location.
2719     }
2720   }
2721 
2722   if (!Record.empty())
2723     Stream.EmitRecord(DIAG_PRAGMA_MAPPINGS, Record);
2724 }
2725 
2726 //===----------------------------------------------------------------------===//
2727 // Type Serialization
2728 //===----------------------------------------------------------------------===//
2729 
2730 /// \brief Write the representation of a type to the AST stream.
WriteType(QualType T)2731 void ASTWriter::WriteType(QualType T) {
2732   TypeIdx &IdxRef = TypeIdxs[T];
2733   if (IdxRef.getIndex() == 0) // we haven't seen this type before.
2734     IdxRef = TypeIdx(NextTypeID++);
2735   TypeIdx Idx = IdxRef;
2736 
2737   assert(Idx.getIndex() >= FirstTypeID && "Re-writing a type from a prior AST");
2738 
2739   RecordData Record;
2740 
2741   // Emit the type's representation.
2742   ASTTypeWriter W(*this, Record);
2743   W.Visit(T);
2744   uint64_t Offset = W.Emit();
2745 
2746   // Record the offset for this type.
2747   unsigned Index = Idx.getIndex() - FirstTypeID;
2748   if (TypeOffsets.size() == Index)
2749     TypeOffsets.push_back(Offset);
2750   else if (TypeOffsets.size() < Index) {
2751     TypeOffsets.resize(Index + 1);
2752     TypeOffsets[Index] = Offset;
2753   } else {
2754     llvm_unreachable("Types emitted in wrong order");
2755   }
2756 }
2757 
2758 //===----------------------------------------------------------------------===//
2759 // Declaration Serialization
2760 //===----------------------------------------------------------------------===//
2761 
2762 /// \brief Write the block containing all of the declaration IDs
2763 /// lexically declared within the given DeclContext.
2764 ///
2765 /// \returns the offset of the DECL_CONTEXT_LEXICAL block within the
2766 /// bistream, or 0 if no block was written.
WriteDeclContextLexicalBlock(ASTContext & Context,DeclContext * DC)2767 uint64_t ASTWriter::WriteDeclContextLexicalBlock(ASTContext &Context,
2768                                                  DeclContext *DC) {
2769   if (DC->decls_empty())
2770     return 0;
2771 
2772   uint64_t Offset = Stream.GetCurrentBitNo();
2773   SmallVector<uint32_t, 128> KindDeclPairs;
2774   for (const auto *D : DC->decls()) {
2775     KindDeclPairs.push_back(D->getKind());
2776     KindDeclPairs.push_back(GetDeclRef(D));
2777   }
2778 
2779   ++NumLexicalDeclContexts;
2780   RecordData::value_type Record[] = {DECL_CONTEXT_LEXICAL};
2781   Stream.EmitRecordWithBlob(DeclContextLexicalAbbrev, Record,
2782                             bytes(KindDeclPairs));
2783   return Offset;
2784 }
2785 
WriteTypeDeclOffsets()2786 void ASTWriter::WriteTypeDeclOffsets() {
2787   using namespace llvm;
2788 
2789   // Write the type offsets array
2790   auto *Abbrev = new BitCodeAbbrev();
2791   Abbrev->Add(BitCodeAbbrevOp(TYPE_OFFSET));
2792   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // # of types
2793   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // base type index
2794   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // types block
2795   unsigned TypeOffsetAbbrev = Stream.EmitAbbrev(Abbrev);
2796   {
2797     RecordData::value_type Record[] = {TYPE_OFFSET, TypeOffsets.size(),
2798                                        FirstTypeID - NUM_PREDEF_TYPE_IDS};
2799     Stream.EmitRecordWithBlob(TypeOffsetAbbrev, Record, bytes(TypeOffsets));
2800   }
2801 
2802   // Write the declaration offsets array
2803   Abbrev = new BitCodeAbbrev();
2804   Abbrev->Add(BitCodeAbbrevOp(DECL_OFFSET));
2805   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // # of declarations
2806   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // base decl ID
2807   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // declarations block
2808   unsigned DeclOffsetAbbrev = Stream.EmitAbbrev(Abbrev);
2809   {
2810     RecordData::value_type Record[] = {DECL_OFFSET, DeclOffsets.size(),
2811                                        FirstDeclID - NUM_PREDEF_DECL_IDS};
2812     Stream.EmitRecordWithBlob(DeclOffsetAbbrev, Record, bytes(DeclOffsets));
2813   }
2814 }
2815 
WriteFileDeclIDsMap()2816 void ASTWriter::WriteFileDeclIDsMap() {
2817   using namespace llvm;
2818 
2819   SmallVector<std::pair<FileID, DeclIDInFileInfo *>, 64> SortedFileDeclIDs(
2820       FileDeclIDs.begin(), FileDeclIDs.end());
2821   std::sort(SortedFileDeclIDs.begin(), SortedFileDeclIDs.end(),
2822             llvm::less_first());
2823 
2824   // Join the vectors of DeclIDs from all files.
2825   SmallVector<DeclID, 256> FileGroupedDeclIDs;
2826   for (auto &FileDeclEntry : SortedFileDeclIDs) {
2827     DeclIDInFileInfo &Info = *FileDeclEntry.second;
2828     Info.FirstDeclIndex = FileGroupedDeclIDs.size();
2829     for (auto &LocDeclEntry : Info.DeclIDs)
2830       FileGroupedDeclIDs.push_back(LocDeclEntry.second);
2831   }
2832 
2833   auto *Abbrev = new BitCodeAbbrev();
2834   Abbrev->Add(BitCodeAbbrevOp(FILE_SORTED_DECLS));
2835   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
2836   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2837   unsigned AbbrevCode = Stream.EmitAbbrev(Abbrev);
2838   RecordData::value_type Record[] = {FILE_SORTED_DECLS,
2839                                      FileGroupedDeclIDs.size()};
2840   Stream.EmitRecordWithBlob(AbbrevCode, Record, bytes(FileGroupedDeclIDs));
2841 }
2842 
WriteComments()2843 void ASTWriter::WriteComments() {
2844   Stream.EnterSubblock(COMMENTS_BLOCK_ID, 3);
2845   ArrayRef<RawComment *> RawComments = Context->Comments.getComments();
2846   RecordData Record;
2847   for (const auto *I : RawComments) {
2848     Record.clear();
2849     AddSourceRange(I->getSourceRange(), Record);
2850     Record.push_back(I->getKind());
2851     Record.push_back(I->isTrailingComment());
2852     Record.push_back(I->isAlmostTrailingComment());
2853     Stream.EmitRecord(COMMENTS_RAW_COMMENT, Record);
2854   }
2855   Stream.ExitBlock();
2856 }
2857 
2858 //===----------------------------------------------------------------------===//
2859 // Global Method Pool and Selector Serialization
2860 //===----------------------------------------------------------------------===//
2861 
2862 namespace {
2863 // Trait used for the on-disk hash table used in the method pool.
2864 class ASTMethodPoolTrait {
2865   ASTWriter &Writer;
2866 
2867 public:
2868   typedef Selector key_type;
2869   typedef key_type key_type_ref;
2870 
2871   struct data_type {
2872     SelectorID ID;
2873     ObjCMethodList Instance, Factory;
2874   };
2875   typedef const data_type& data_type_ref;
2876 
2877   typedef unsigned hash_value_type;
2878   typedef unsigned offset_type;
2879 
ASTMethodPoolTrait(ASTWriter & Writer)2880   explicit ASTMethodPoolTrait(ASTWriter &Writer) : Writer(Writer) { }
2881 
ComputeHash(Selector Sel)2882   static hash_value_type ComputeHash(Selector Sel) {
2883     return serialization::ComputeHash(Sel);
2884   }
2885 
2886   std::pair<unsigned,unsigned>
EmitKeyDataLength(raw_ostream & Out,Selector Sel,data_type_ref Methods)2887     EmitKeyDataLength(raw_ostream& Out, Selector Sel,
2888                       data_type_ref Methods) {
2889     using namespace llvm::support;
2890     endian::Writer<little> LE(Out);
2891     unsigned KeyLen = 2 + (Sel.getNumArgs()? Sel.getNumArgs() * 4 : 4);
2892     LE.write<uint16_t>(KeyLen);
2893     unsigned DataLen = 4 + 2 + 2; // 2 bytes for each of the method counts
2894     for (const ObjCMethodList *Method = &Methods.Instance; Method;
2895          Method = Method->getNext())
2896       if (Method->getMethod())
2897         DataLen += 4;
2898     for (const ObjCMethodList *Method = &Methods.Factory; Method;
2899          Method = Method->getNext())
2900       if (Method->getMethod())
2901         DataLen += 4;
2902     LE.write<uint16_t>(DataLen);
2903     return std::make_pair(KeyLen, DataLen);
2904   }
2905 
EmitKey(raw_ostream & Out,Selector Sel,unsigned)2906   void EmitKey(raw_ostream& Out, Selector Sel, unsigned) {
2907     using namespace llvm::support;
2908     endian::Writer<little> LE(Out);
2909     uint64_t Start = Out.tell();
2910     assert((Start >> 32) == 0 && "Selector key offset too large");
2911     Writer.SetSelectorOffset(Sel, Start);
2912     unsigned N = Sel.getNumArgs();
2913     LE.write<uint16_t>(N);
2914     if (N == 0)
2915       N = 1;
2916     for (unsigned I = 0; I != N; ++I)
2917       LE.write<uint32_t>(
2918           Writer.getIdentifierRef(Sel.getIdentifierInfoForSlot(I)));
2919   }
2920 
EmitData(raw_ostream & Out,key_type_ref,data_type_ref Methods,unsigned DataLen)2921   void EmitData(raw_ostream& Out, key_type_ref,
2922                 data_type_ref Methods, unsigned DataLen) {
2923     using namespace llvm::support;
2924     endian::Writer<little> LE(Out);
2925     uint64_t Start = Out.tell(); (void)Start;
2926     LE.write<uint32_t>(Methods.ID);
2927     unsigned NumInstanceMethods = 0;
2928     for (const ObjCMethodList *Method = &Methods.Instance; Method;
2929          Method = Method->getNext())
2930       if (Method->getMethod())
2931         ++NumInstanceMethods;
2932 
2933     unsigned NumFactoryMethods = 0;
2934     for (const ObjCMethodList *Method = &Methods.Factory; Method;
2935          Method = Method->getNext())
2936       if (Method->getMethod())
2937         ++NumFactoryMethods;
2938 
2939     unsigned InstanceBits = Methods.Instance.getBits();
2940     assert(InstanceBits < 4);
2941     unsigned InstanceHasMoreThanOneDeclBit =
2942         Methods.Instance.hasMoreThanOneDecl();
2943     unsigned FullInstanceBits = (NumInstanceMethods << 3) |
2944                                 (InstanceHasMoreThanOneDeclBit << 2) |
2945                                 InstanceBits;
2946     unsigned FactoryBits = Methods.Factory.getBits();
2947     assert(FactoryBits < 4);
2948     unsigned FactoryHasMoreThanOneDeclBit =
2949         Methods.Factory.hasMoreThanOneDecl();
2950     unsigned FullFactoryBits = (NumFactoryMethods << 3) |
2951                                (FactoryHasMoreThanOneDeclBit << 2) |
2952                                FactoryBits;
2953     LE.write<uint16_t>(FullInstanceBits);
2954     LE.write<uint16_t>(FullFactoryBits);
2955     for (const ObjCMethodList *Method = &Methods.Instance; Method;
2956          Method = Method->getNext())
2957       if (Method->getMethod())
2958         LE.write<uint32_t>(Writer.getDeclID(Method->getMethod()));
2959     for (const ObjCMethodList *Method = &Methods.Factory; Method;
2960          Method = Method->getNext())
2961       if (Method->getMethod())
2962         LE.write<uint32_t>(Writer.getDeclID(Method->getMethod()));
2963 
2964     assert(Out.tell() - Start == DataLen && "Data length is wrong");
2965   }
2966 };
2967 } // end anonymous namespace
2968 
2969 /// \brief Write ObjC data: selectors and the method pool.
2970 ///
2971 /// The method pool contains both instance and factory methods, stored
2972 /// in an on-disk hash table indexed by the selector. The hash table also
2973 /// contains an empty entry for every other selector known to Sema.
WriteSelectors(Sema & SemaRef)2974 void ASTWriter::WriteSelectors(Sema &SemaRef) {
2975   using namespace llvm;
2976 
2977   // Do we have to do anything at all?
2978   if (SemaRef.MethodPool.empty() && SelectorIDs.empty())
2979     return;
2980   unsigned NumTableEntries = 0;
2981   // Create and write out the blob that contains selectors and the method pool.
2982   {
2983     llvm::OnDiskChainedHashTableGenerator<ASTMethodPoolTrait> Generator;
2984     ASTMethodPoolTrait Trait(*this);
2985 
2986     // Create the on-disk hash table representation. We walk through every
2987     // selector we've seen and look it up in the method pool.
2988     SelectorOffsets.resize(NextSelectorID - FirstSelectorID);
2989     for (auto &SelectorAndID : SelectorIDs) {
2990       Selector S = SelectorAndID.first;
2991       SelectorID ID = SelectorAndID.second;
2992       Sema::GlobalMethodPool::iterator F = SemaRef.MethodPool.find(S);
2993       ASTMethodPoolTrait::data_type Data = {
2994         ID,
2995         ObjCMethodList(),
2996         ObjCMethodList()
2997       };
2998       if (F != SemaRef.MethodPool.end()) {
2999         Data.Instance = F->second.first;
3000         Data.Factory = F->second.second;
3001       }
3002       // Only write this selector if it's not in an existing AST or something
3003       // changed.
3004       if (Chain && ID < FirstSelectorID) {
3005         // Selector already exists. Did it change?
3006         bool changed = false;
3007         for (ObjCMethodList *M = &Data.Instance;
3008              !changed && M && M->getMethod(); M = M->getNext()) {
3009           if (!M->getMethod()->isFromASTFile())
3010             changed = true;
3011         }
3012         for (ObjCMethodList *M = &Data.Factory; !changed && M && M->getMethod();
3013              M = M->getNext()) {
3014           if (!M->getMethod()->isFromASTFile())
3015             changed = true;
3016         }
3017         if (!changed)
3018           continue;
3019       } else if (Data.Instance.getMethod() || Data.Factory.getMethod()) {
3020         // A new method pool entry.
3021         ++NumTableEntries;
3022       }
3023       Generator.insert(S, Data, Trait);
3024     }
3025 
3026     // Create the on-disk hash table in a buffer.
3027     SmallString<4096> MethodPool;
3028     uint32_t BucketOffset;
3029     {
3030       using namespace llvm::support;
3031       ASTMethodPoolTrait Trait(*this);
3032       llvm::raw_svector_ostream Out(MethodPool);
3033       // Make sure that no bucket is at offset 0
3034       endian::Writer<little>(Out).write<uint32_t>(0);
3035       BucketOffset = Generator.Emit(Out, Trait);
3036     }
3037 
3038     // Create a blob abbreviation
3039     auto *Abbrev = new BitCodeAbbrev();
3040     Abbrev->Add(BitCodeAbbrevOp(METHOD_POOL));
3041     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3042     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3043     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
3044     unsigned MethodPoolAbbrev = Stream.EmitAbbrev(Abbrev);
3045 
3046     // Write the method pool
3047     {
3048       RecordData::value_type Record[] = {METHOD_POOL, BucketOffset,
3049                                          NumTableEntries};
3050       Stream.EmitRecordWithBlob(MethodPoolAbbrev, Record, MethodPool);
3051     }
3052 
3053     // Create a blob abbreviation for the selector table offsets.
3054     Abbrev = new BitCodeAbbrev();
3055     Abbrev->Add(BitCodeAbbrevOp(SELECTOR_OFFSETS));
3056     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // size
3057     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // first ID
3058     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
3059     unsigned SelectorOffsetAbbrev = Stream.EmitAbbrev(Abbrev);
3060 
3061     // Write the selector offsets table.
3062     {
3063       RecordData::value_type Record[] = {
3064           SELECTOR_OFFSETS, SelectorOffsets.size(),
3065           FirstSelectorID - NUM_PREDEF_SELECTOR_IDS};
3066       Stream.EmitRecordWithBlob(SelectorOffsetAbbrev, Record,
3067                                 bytes(SelectorOffsets));
3068     }
3069   }
3070 }
3071 
3072 /// \brief Write the selectors referenced in @selector expression into AST file.
WriteReferencedSelectorsPool(Sema & SemaRef)3073 void ASTWriter::WriteReferencedSelectorsPool(Sema &SemaRef) {
3074   using namespace llvm;
3075   if (SemaRef.ReferencedSelectors.empty())
3076     return;
3077 
3078   RecordData Record;
3079   ASTRecordWriter Writer(*this, Record);
3080 
3081   // Note: this writes out all references even for a dependent AST. But it is
3082   // very tricky to fix, and given that @selector shouldn't really appear in
3083   // headers, probably not worth it. It's not a correctness issue.
3084   for (auto &SelectorAndLocation : SemaRef.ReferencedSelectors) {
3085     Selector Sel = SelectorAndLocation.first;
3086     SourceLocation Loc = SelectorAndLocation.second;
3087     Writer.AddSelectorRef(Sel);
3088     Writer.AddSourceLocation(Loc);
3089   }
3090   Writer.Emit(REFERENCED_SELECTOR_POOL);
3091 }
3092 
3093 //===----------------------------------------------------------------------===//
3094 // Identifier Table Serialization
3095 //===----------------------------------------------------------------------===//
3096 
3097 /// Determine the declaration that should be put into the name lookup table to
3098 /// represent the given declaration in this module. This is usually D itself,
3099 /// but if D was imported and merged into a local declaration, we want the most
3100 /// recent local declaration instead. The chosen declaration will be the most
3101 /// recent declaration in any module that imports this one.
getDeclForLocalLookup(const LangOptions & LangOpts,NamedDecl * D)3102 static NamedDecl *getDeclForLocalLookup(const LangOptions &LangOpts,
3103                                         NamedDecl *D) {
3104   if (!LangOpts.Modules || !D->isFromASTFile())
3105     return D;
3106 
3107   if (Decl *Redecl = D->getPreviousDecl()) {
3108     // For Redeclarable decls, a prior declaration might be local.
3109     for (; Redecl; Redecl = Redecl->getPreviousDecl()) {
3110       // If we find a local decl, we're done.
3111       if (!Redecl->isFromASTFile()) {
3112         // Exception: in very rare cases (for injected-class-names), not all
3113         // redeclarations are in the same semantic context. Skip ones in a
3114         // different context. They don't go in this lookup table at all.
3115         if (!Redecl->getDeclContext()->getRedeclContext()->Equals(
3116                 D->getDeclContext()->getRedeclContext()))
3117           continue;
3118         return cast<NamedDecl>(Redecl);
3119       }
3120 
3121       // If we find a decl from a (chained-)PCH stop since we won't find a
3122       // local one.
3123       if (Redecl->getOwningModuleID() == 0)
3124         break;
3125     }
3126   } else if (Decl *First = D->getCanonicalDecl()) {
3127     // For Mergeable decls, the first decl might be local.
3128     if (!First->isFromASTFile())
3129       return cast<NamedDecl>(First);
3130   }
3131 
3132   // All declarations are imported. Our most recent declaration will also be
3133   // the most recent one in anyone who imports us.
3134   return D;
3135 }
3136 
3137 namespace {
3138 class ASTIdentifierTableTrait {
3139   ASTWriter &Writer;
3140   Preprocessor &PP;
3141   IdentifierResolver &IdResolver;
3142   bool IsModule;
3143   bool NeedDecls;
3144   ASTWriter::RecordData *InterestingIdentifierOffsets;
3145 
3146   /// \brief Determines whether this is an "interesting" identifier that needs a
3147   /// full IdentifierInfo structure written into the hash table. Notably, this
3148   /// doesn't check whether the name has macros defined; use PublicMacroIterator
3149   /// to check that.
isInterestingIdentifier(const IdentifierInfo * II,uint64_t MacroOffset)3150   bool isInterestingIdentifier(const IdentifierInfo *II, uint64_t MacroOffset) {
3151     if (MacroOffset ||
3152         II->isPoisoned() ||
3153         (IsModule ? II->hasRevertedBuiltin() : II->getObjCOrBuiltinID()) ||
3154         II->hasRevertedTokenIDToIdentifier() ||
3155         (NeedDecls && II->getFETokenInfo<void>()))
3156       return true;
3157 
3158     return false;
3159   }
3160 
3161 public:
3162   typedef IdentifierInfo* key_type;
3163   typedef key_type  key_type_ref;
3164 
3165   typedef IdentID data_type;
3166   typedef data_type data_type_ref;
3167 
3168   typedef unsigned hash_value_type;
3169   typedef unsigned offset_type;
3170 
ASTIdentifierTableTrait(ASTWriter & Writer,Preprocessor & PP,IdentifierResolver & IdResolver,bool IsModule,ASTWriter::RecordData * InterestingIdentifierOffsets)3171   ASTIdentifierTableTrait(ASTWriter &Writer, Preprocessor &PP,
3172                           IdentifierResolver &IdResolver, bool IsModule,
3173                           ASTWriter::RecordData *InterestingIdentifierOffsets)
3174       : Writer(Writer), PP(PP), IdResolver(IdResolver), IsModule(IsModule),
3175         NeedDecls(!IsModule || !Writer.getLangOpts().CPlusPlus),
3176         InterestingIdentifierOffsets(InterestingIdentifierOffsets) {}
3177 
needDecls() const3178   bool needDecls() const { return NeedDecls; }
3179 
ComputeHash(const IdentifierInfo * II)3180   static hash_value_type ComputeHash(const IdentifierInfo* II) {
3181     return llvm::HashString(II->getName());
3182   }
3183 
isInterestingIdentifier(const IdentifierInfo * II)3184   bool isInterestingIdentifier(const IdentifierInfo *II) {
3185     auto MacroOffset = Writer.getMacroDirectivesOffset(II);
3186     return isInterestingIdentifier(II, MacroOffset);
3187   }
isInterestingNonMacroIdentifier(const IdentifierInfo * II)3188   bool isInterestingNonMacroIdentifier(const IdentifierInfo *II) {
3189     return isInterestingIdentifier(II, 0);
3190   }
3191 
3192   std::pair<unsigned,unsigned>
EmitKeyDataLength(raw_ostream & Out,IdentifierInfo * II,IdentID ID)3193   EmitKeyDataLength(raw_ostream& Out, IdentifierInfo* II, IdentID ID) {
3194     unsigned KeyLen = II->getLength() + 1;
3195     unsigned DataLen = 4; // 4 bytes for the persistent ID << 1
3196     auto MacroOffset = Writer.getMacroDirectivesOffset(II);
3197     if (isInterestingIdentifier(II, MacroOffset)) {
3198       DataLen += 2; // 2 bytes for builtin ID
3199       DataLen += 2; // 2 bytes for flags
3200       if (MacroOffset)
3201         DataLen += 4; // MacroDirectives offset.
3202 
3203       if (NeedDecls) {
3204         for (IdentifierResolver::iterator D = IdResolver.begin(II),
3205                                        DEnd = IdResolver.end();
3206              D != DEnd; ++D)
3207           DataLen += 4;
3208       }
3209     }
3210     using namespace llvm::support;
3211     endian::Writer<little> LE(Out);
3212 
3213     assert((uint16_t)DataLen == DataLen && (uint16_t)KeyLen == KeyLen);
3214     LE.write<uint16_t>(DataLen);
3215     // We emit the key length after the data length so that every
3216     // string is preceded by a 16-bit length. This matches the PTH
3217     // format for storing identifiers.
3218     LE.write<uint16_t>(KeyLen);
3219     return std::make_pair(KeyLen, DataLen);
3220   }
3221 
EmitKey(raw_ostream & Out,const IdentifierInfo * II,unsigned KeyLen)3222   void EmitKey(raw_ostream& Out, const IdentifierInfo* II,
3223                unsigned KeyLen) {
3224     // Record the location of the key data.  This is used when generating
3225     // the mapping from persistent IDs to strings.
3226     Writer.SetIdentifierOffset(II, Out.tell());
3227 
3228     // Emit the offset of the key/data length information to the interesting
3229     // identifiers table if necessary.
3230     if (InterestingIdentifierOffsets && isInterestingIdentifier(II))
3231       InterestingIdentifierOffsets->push_back(Out.tell() - 4);
3232 
3233     Out.write(II->getNameStart(), KeyLen);
3234   }
3235 
EmitData(raw_ostream & Out,IdentifierInfo * II,IdentID ID,unsigned)3236   void EmitData(raw_ostream& Out, IdentifierInfo* II,
3237                 IdentID ID, unsigned) {
3238     using namespace llvm::support;
3239     endian::Writer<little> LE(Out);
3240 
3241     auto MacroOffset = Writer.getMacroDirectivesOffset(II);
3242     if (!isInterestingIdentifier(II, MacroOffset)) {
3243       LE.write<uint32_t>(ID << 1);
3244       return;
3245     }
3246 
3247     LE.write<uint32_t>((ID << 1) | 0x01);
3248     uint32_t Bits = (uint32_t)II->getObjCOrBuiltinID();
3249     assert((Bits & 0xffff) == Bits && "ObjCOrBuiltinID too big for ASTReader.");
3250     LE.write<uint16_t>(Bits);
3251     Bits = 0;
3252     bool HadMacroDefinition = MacroOffset != 0;
3253     Bits = (Bits << 1) | unsigned(HadMacroDefinition);
3254     Bits = (Bits << 1) | unsigned(II->isExtensionToken());
3255     Bits = (Bits << 1) | unsigned(II->isPoisoned());
3256     Bits = (Bits << 1) | unsigned(II->hasRevertedBuiltin());
3257     Bits = (Bits << 1) | unsigned(II->hasRevertedTokenIDToIdentifier());
3258     Bits = (Bits << 1) | unsigned(II->isCPlusPlusOperatorKeyword());
3259     LE.write<uint16_t>(Bits);
3260 
3261     if (HadMacroDefinition)
3262       LE.write<uint32_t>(MacroOffset);
3263 
3264     if (NeedDecls) {
3265       // Emit the declaration IDs in reverse order, because the
3266       // IdentifierResolver provides the declarations as they would be
3267       // visible (e.g., the function "stat" would come before the struct
3268       // "stat"), but the ASTReader adds declarations to the end of the list
3269       // (so we need to see the struct "stat" before the function "stat").
3270       // Only emit declarations that aren't from a chained PCH, though.
3271       SmallVector<NamedDecl *, 16> Decls(IdResolver.begin(II),
3272                                          IdResolver.end());
3273       for (SmallVectorImpl<NamedDecl *>::reverse_iterator D = Decls.rbegin(),
3274                                                           DEnd = Decls.rend();
3275            D != DEnd; ++D)
3276         LE.write<uint32_t>(
3277             Writer.getDeclID(getDeclForLocalLookup(PP.getLangOpts(), *D)));
3278     }
3279   }
3280 };
3281 } // end anonymous namespace
3282 
3283 /// \brief Write the identifier table into the AST file.
3284 ///
3285 /// The identifier table consists of a blob containing string data
3286 /// (the actual identifiers themselves) and a separate "offsets" index
3287 /// that maps identifier IDs to locations within the blob.
WriteIdentifierTable(Preprocessor & PP,IdentifierResolver & IdResolver,bool IsModule)3288 void ASTWriter::WriteIdentifierTable(Preprocessor &PP,
3289                                      IdentifierResolver &IdResolver,
3290                                      bool IsModule) {
3291   using namespace llvm;
3292 
3293   RecordData InterestingIdents;
3294 
3295   // Create and write out the blob that contains the identifier
3296   // strings.
3297   {
3298     llvm::OnDiskChainedHashTableGenerator<ASTIdentifierTableTrait> Generator;
3299     ASTIdentifierTableTrait Trait(
3300         *this, PP, IdResolver, IsModule,
3301         (getLangOpts().CPlusPlus && IsModule) ? &InterestingIdents : nullptr);
3302 
3303     // Look for any identifiers that were named while processing the
3304     // headers, but are otherwise not needed. We add these to the hash
3305     // table to enable checking of the predefines buffer in the case
3306     // where the user adds new macro definitions when building the AST
3307     // file.
3308     SmallVector<const IdentifierInfo *, 128> IIs;
3309     for (const auto &ID : PP.getIdentifierTable())
3310       IIs.push_back(ID.second);
3311     // Sort the identifiers lexicographically before getting them references so
3312     // that their order is stable.
3313     std::sort(IIs.begin(), IIs.end(), llvm::less_ptr<IdentifierInfo>());
3314     for (const IdentifierInfo *II : IIs)
3315       if (Trait.isInterestingNonMacroIdentifier(II))
3316         getIdentifierRef(II);
3317 
3318     // Create the on-disk hash table representation. We only store offsets
3319     // for identifiers that appear here for the first time.
3320     IdentifierOffsets.resize(NextIdentID - FirstIdentID);
3321     for (auto IdentIDPair : IdentifierIDs) {
3322       auto *II = const_cast<IdentifierInfo *>(IdentIDPair.first);
3323       IdentID ID = IdentIDPair.second;
3324       assert(II && "NULL identifier in identifier table");
3325       // Write out identifiers if either the ID is local or the identifier has
3326       // changed since it was loaded.
3327       if (ID >= FirstIdentID || !Chain || !II->isFromAST()
3328           || II->hasChangedSinceDeserialization() ||
3329           (Trait.needDecls() &&
3330            II->hasFETokenInfoChangedSinceDeserialization()))
3331         Generator.insert(II, ID, Trait);
3332     }
3333 
3334     // Create the on-disk hash table in a buffer.
3335     SmallString<4096> IdentifierTable;
3336     uint32_t BucketOffset;
3337     {
3338       using namespace llvm::support;
3339       llvm::raw_svector_ostream Out(IdentifierTable);
3340       // Make sure that no bucket is at offset 0
3341       endian::Writer<little>(Out).write<uint32_t>(0);
3342       BucketOffset = Generator.Emit(Out, Trait);
3343     }
3344 
3345     // Create a blob abbreviation
3346     auto *Abbrev = new BitCodeAbbrev();
3347     Abbrev->Add(BitCodeAbbrevOp(IDENTIFIER_TABLE));
3348     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
3349     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
3350     unsigned IDTableAbbrev = Stream.EmitAbbrev(Abbrev);
3351 
3352     // Write the identifier table
3353     RecordData::value_type Record[] = {IDENTIFIER_TABLE, BucketOffset};
3354     Stream.EmitRecordWithBlob(IDTableAbbrev, Record, IdentifierTable);
3355   }
3356 
3357   // Write the offsets table for identifier IDs.
3358   auto *Abbrev = new BitCodeAbbrev();
3359   Abbrev->Add(BitCodeAbbrevOp(IDENTIFIER_OFFSET));
3360   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // # of identifiers
3361   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // first ID
3362   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
3363   unsigned IdentifierOffsetAbbrev = Stream.EmitAbbrev(Abbrev);
3364 
3365 #ifndef NDEBUG
3366   for (unsigned I = 0, N = IdentifierOffsets.size(); I != N; ++I)
3367     assert(IdentifierOffsets[I] && "Missing identifier offset?");
3368 #endif
3369 
3370   RecordData::value_type Record[] = {IDENTIFIER_OFFSET,
3371                                      IdentifierOffsets.size(),
3372                                      FirstIdentID - NUM_PREDEF_IDENT_IDS};
3373   Stream.EmitRecordWithBlob(IdentifierOffsetAbbrev, Record,
3374                             bytes(IdentifierOffsets));
3375 
3376   // In C++, write the list of interesting identifiers (those that are
3377   // defined as macros, poisoned, or similar unusual things).
3378   if (!InterestingIdents.empty())
3379     Stream.EmitRecord(INTERESTING_IDENTIFIERS, InterestingIdents);
3380 }
3381 
3382 //===----------------------------------------------------------------------===//
3383 // DeclContext's Name Lookup Table Serialization
3384 //===----------------------------------------------------------------------===//
3385 
3386 namespace {
3387 // Trait used for the on-disk hash table used in the method pool.
3388 class ASTDeclContextNameLookupTrait {
3389   ASTWriter &Writer;
3390   llvm::SmallVector<DeclID, 64> DeclIDs;
3391 
3392 public:
3393   typedef DeclarationNameKey key_type;
3394   typedef key_type key_type_ref;
3395 
3396   /// A start and end index into DeclIDs, representing a sequence of decls.
3397   typedef std::pair<unsigned, unsigned> data_type;
3398   typedef const data_type& data_type_ref;
3399 
3400   typedef unsigned hash_value_type;
3401   typedef unsigned offset_type;
3402 
ASTDeclContextNameLookupTrait(ASTWriter & Writer)3403   explicit ASTDeclContextNameLookupTrait(ASTWriter &Writer) : Writer(Writer) { }
3404 
3405   template<typename Coll>
getData(const Coll & Decls)3406   data_type getData(const Coll &Decls) {
3407     unsigned Start = DeclIDs.size();
3408     for (NamedDecl *D : Decls) {
3409       DeclIDs.push_back(
3410           Writer.GetDeclRef(getDeclForLocalLookup(Writer.getLangOpts(), D)));
3411     }
3412     return std::make_pair(Start, DeclIDs.size());
3413   }
3414 
ImportData(const reader::ASTDeclContextNameLookupTrait::data_type & FromReader)3415   data_type ImportData(const reader::ASTDeclContextNameLookupTrait::data_type &FromReader) {
3416     unsigned Start = DeclIDs.size();
3417     for (auto ID : FromReader)
3418       DeclIDs.push_back(ID);
3419     return std::make_pair(Start, DeclIDs.size());
3420   }
3421 
EqualKey(key_type_ref a,key_type_ref b)3422   static bool EqualKey(key_type_ref a, key_type_ref b) {
3423     return a == b;
3424   }
3425 
ComputeHash(DeclarationNameKey Name)3426   hash_value_type ComputeHash(DeclarationNameKey Name) {
3427     return Name.getHash();
3428   }
3429 
EmitFileRef(raw_ostream & Out,ModuleFile * F) const3430   void EmitFileRef(raw_ostream &Out, ModuleFile *F) const {
3431     assert(Writer.hasChain() &&
3432            "have reference to loaded module file but no chain?");
3433 
3434     using namespace llvm::support;
3435     endian::Writer<little>(Out)
3436         .write<uint32_t>(Writer.getChain()->getModuleFileID(F));
3437   }
3438 
EmitKeyDataLength(raw_ostream & Out,DeclarationNameKey Name,data_type_ref Lookup)3439   std::pair<unsigned, unsigned> EmitKeyDataLength(raw_ostream &Out,
3440                                                   DeclarationNameKey Name,
3441                                                   data_type_ref Lookup) {
3442     using namespace llvm::support;
3443     endian::Writer<little> LE(Out);
3444     unsigned KeyLen = 1;
3445     switch (Name.getKind()) {
3446     case DeclarationName::Identifier:
3447     case DeclarationName::ObjCZeroArgSelector:
3448     case DeclarationName::ObjCOneArgSelector:
3449     case DeclarationName::ObjCMultiArgSelector:
3450     case DeclarationName::CXXLiteralOperatorName:
3451       KeyLen += 4;
3452       break;
3453     case DeclarationName::CXXOperatorName:
3454       KeyLen += 1;
3455       break;
3456     case DeclarationName::CXXConstructorName:
3457     case DeclarationName::CXXDestructorName:
3458     case DeclarationName::CXXConversionFunctionName:
3459     case DeclarationName::CXXUsingDirective:
3460       break;
3461     }
3462     LE.write<uint16_t>(KeyLen);
3463 
3464     // 4 bytes for each DeclID.
3465     unsigned DataLen = 4 * (Lookup.second - Lookup.first);
3466     assert(uint16_t(DataLen) == DataLen &&
3467            "too many decls for serialized lookup result");
3468     LE.write<uint16_t>(DataLen);
3469 
3470     return std::make_pair(KeyLen, DataLen);
3471   }
3472 
EmitKey(raw_ostream & Out,DeclarationNameKey Name,unsigned)3473   void EmitKey(raw_ostream &Out, DeclarationNameKey Name, unsigned) {
3474     using namespace llvm::support;
3475     endian::Writer<little> LE(Out);
3476     LE.write<uint8_t>(Name.getKind());
3477     switch (Name.getKind()) {
3478     case DeclarationName::Identifier:
3479     case DeclarationName::CXXLiteralOperatorName:
3480       LE.write<uint32_t>(Writer.getIdentifierRef(Name.getIdentifier()));
3481       return;
3482     case DeclarationName::ObjCZeroArgSelector:
3483     case DeclarationName::ObjCOneArgSelector:
3484     case DeclarationName::ObjCMultiArgSelector:
3485       LE.write<uint32_t>(Writer.getSelectorRef(Name.getSelector()));
3486       return;
3487     case DeclarationName::CXXOperatorName:
3488       assert(Name.getOperatorKind() < NUM_OVERLOADED_OPERATORS &&
3489              "Invalid operator?");
3490       LE.write<uint8_t>(Name.getOperatorKind());
3491       return;
3492     case DeclarationName::CXXConstructorName:
3493     case DeclarationName::CXXDestructorName:
3494     case DeclarationName::CXXConversionFunctionName:
3495     case DeclarationName::CXXUsingDirective:
3496       return;
3497     }
3498 
3499     llvm_unreachable("Invalid name kind?");
3500   }
3501 
EmitData(raw_ostream & Out,key_type_ref,data_type Lookup,unsigned DataLen)3502   void EmitData(raw_ostream &Out, key_type_ref, data_type Lookup,
3503                 unsigned DataLen) {
3504     using namespace llvm::support;
3505     endian::Writer<little> LE(Out);
3506     uint64_t Start = Out.tell(); (void)Start;
3507     for (unsigned I = Lookup.first, N = Lookup.second; I != N; ++I)
3508       LE.write<uint32_t>(DeclIDs[I]);
3509     assert(Out.tell() - Start == DataLen && "Data length is wrong");
3510   }
3511 };
3512 } // end anonymous namespace
3513 
isLookupResultExternal(StoredDeclsList & Result,DeclContext * DC)3514 bool ASTWriter::isLookupResultExternal(StoredDeclsList &Result,
3515                                        DeclContext *DC) {
3516   return Result.hasExternalDecls() && DC->NeedToReconcileExternalVisibleStorage;
3517 }
3518 
isLookupResultEntirelyExternal(StoredDeclsList & Result,DeclContext * DC)3519 bool ASTWriter::isLookupResultEntirelyExternal(StoredDeclsList &Result,
3520                                                DeclContext *DC) {
3521   for (auto *D : Result.getLookupResult())
3522     if (!getDeclForLocalLookup(getLangOpts(), D)->isFromASTFile())
3523       return false;
3524 
3525   return true;
3526 }
3527 
3528 void
GenerateNameLookupTable(const DeclContext * ConstDC,llvm::SmallVectorImpl<char> & LookupTable)3529 ASTWriter::GenerateNameLookupTable(const DeclContext *ConstDC,
3530                                    llvm::SmallVectorImpl<char> &LookupTable) {
3531   assert(!ConstDC->HasLazyLocalLexicalLookups &&
3532          !ConstDC->HasLazyExternalLexicalLookups &&
3533          "must call buildLookups first");
3534 
3535   // FIXME: We need to build the lookups table, which is logically const.
3536   auto *DC = const_cast<DeclContext*>(ConstDC);
3537   assert(DC == DC->getPrimaryContext() && "only primary DC has lookup table");
3538 
3539   // Create the on-disk hash table representation.
3540   MultiOnDiskHashTableGenerator<reader::ASTDeclContextNameLookupTrait,
3541                                 ASTDeclContextNameLookupTrait> Generator;
3542   ASTDeclContextNameLookupTrait Trait(*this);
3543 
3544   // The first step is to collect the declaration names which we need to
3545   // serialize into the name lookup table, and to collect them in a stable
3546   // order.
3547   SmallVector<DeclarationName, 16> Names;
3548 
3549   // We also build up small sets of the constructor and conversion function
3550   // names which are visible.
3551   llvm::SmallSet<DeclarationName, 8> ConstructorNameSet, ConversionNameSet;
3552 
3553   for (auto &Lookup : *DC->buildLookup()) {
3554     auto &Name = Lookup.first;
3555     auto &Result = Lookup.second;
3556 
3557     // If there are no local declarations in our lookup result, we
3558     // don't need to write an entry for the name at all. If we can't
3559     // write out a lookup set without performing more deserialization,
3560     // just skip this entry.
3561     if (isLookupResultExternal(Result, DC) &&
3562         isLookupResultEntirelyExternal(Result, DC))
3563       continue;
3564 
3565     // We also skip empty results. If any of the results could be external and
3566     // the currently available results are empty, then all of the results are
3567     // external and we skip it above. So the only way we get here with an empty
3568     // results is when no results could have been external *and* we have
3569     // external results.
3570     //
3571     // FIXME: While we might want to start emitting on-disk entries for negative
3572     // lookups into a decl context as an optimization, today we *have* to skip
3573     // them because there are names with empty lookup results in decl contexts
3574     // which we can't emit in any stable ordering: we lookup constructors and
3575     // conversion functions in the enclosing namespace scope creating empty
3576     // results for them. This in almost certainly a bug in Clang's name lookup,
3577     // but that is likely to be hard or impossible to fix and so we tolerate it
3578     // here by omitting lookups with empty results.
3579     if (Lookup.second.getLookupResult().empty())
3580       continue;
3581 
3582     switch (Lookup.first.getNameKind()) {
3583     default:
3584       Names.push_back(Lookup.first);
3585       break;
3586 
3587     case DeclarationName::CXXConstructorName:
3588       assert(isa<CXXRecordDecl>(DC) &&
3589              "Cannot have a constructor name outside of a class!");
3590       ConstructorNameSet.insert(Name);
3591       break;
3592 
3593     case DeclarationName::CXXConversionFunctionName:
3594       assert(isa<CXXRecordDecl>(DC) &&
3595              "Cannot have a conversion function name outside of a class!");
3596       ConversionNameSet.insert(Name);
3597       break;
3598     }
3599   }
3600 
3601   // Sort the names into a stable order.
3602   std::sort(Names.begin(), Names.end());
3603 
3604   if (auto *D = dyn_cast<CXXRecordDecl>(DC)) {
3605     // We need to establish an ordering of constructor and conversion function
3606     // names, and they don't have an intrinsic ordering.
3607 
3608     // First we try the easy case by forming the current context's constructor
3609     // name and adding that name first. This is a very useful optimization to
3610     // avoid walking the lexical declarations in many cases, and it also
3611     // handles the only case where a constructor name can come from some other
3612     // lexical context -- when that name is an implicit constructor merged from
3613     // another declaration in the redecl chain. Any non-implicit constructor or
3614     // conversion function which doesn't occur in all the lexical contexts
3615     // would be an ODR violation.
3616     auto ImplicitCtorName = Context->DeclarationNames.getCXXConstructorName(
3617         Context->getCanonicalType(Context->getRecordType(D)));
3618     if (ConstructorNameSet.erase(ImplicitCtorName))
3619       Names.push_back(ImplicitCtorName);
3620 
3621     // If we still have constructors or conversion functions, we walk all the
3622     // names in the decl and add the constructors and conversion functions
3623     // which are visible in the order they lexically occur within the context.
3624     if (!ConstructorNameSet.empty() || !ConversionNameSet.empty())
3625       for (Decl *ChildD : cast<CXXRecordDecl>(DC)->decls())
3626         if (auto *ChildND = dyn_cast<NamedDecl>(ChildD)) {
3627           auto Name = ChildND->getDeclName();
3628           switch (Name.getNameKind()) {
3629           default:
3630             continue;
3631 
3632           case DeclarationName::CXXConstructorName:
3633             if (ConstructorNameSet.erase(Name))
3634               Names.push_back(Name);
3635             break;
3636 
3637           case DeclarationName::CXXConversionFunctionName:
3638             if (ConversionNameSet.erase(Name))
3639               Names.push_back(Name);
3640             break;
3641           }
3642 
3643           if (ConstructorNameSet.empty() && ConversionNameSet.empty())
3644             break;
3645         }
3646 
3647     assert(ConstructorNameSet.empty() && "Failed to find all of the visible "
3648                                          "constructors by walking all the "
3649                                          "lexical members of the context.");
3650     assert(ConversionNameSet.empty() && "Failed to find all of the visible "
3651                                         "conversion functions by walking all "
3652                                         "the lexical members of the context.");
3653   }
3654 
3655   // Next we need to do a lookup with each name into this decl context to fully
3656   // populate any results from external sources. We don't actually use the
3657   // results of these lookups because we only want to use the results after all
3658   // results have been loaded and the pointers into them will be stable.
3659   for (auto &Name : Names)
3660     DC->lookup(Name);
3661 
3662   // Now we need to insert the results for each name into the hash table. For
3663   // constructor names and conversion function names, we actually need to merge
3664   // all of the results for them into one list of results each and insert
3665   // those.
3666   SmallVector<NamedDecl *, 8> ConstructorDecls;
3667   SmallVector<NamedDecl *, 8> ConversionDecls;
3668 
3669   // Now loop over the names, either inserting them or appending for the two
3670   // special cases.
3671   for (auto &Name : Names) {
3672     DeclContext::lookup_result Result = DC->noload_lookup(Name);
3673 
3674     switch (Name.getNameKind()) {
3675     default:
3676       Generator.insert(Name, Trait.getData(Result), Trait);
3677       break;
3678 
3679     case DeclarationName::CXXConstructorName:
3680       ConstructorDecls.append(Result.begin(), Result.end());
3681       break;
3682 
3683     case DeclarationName::CXXConversionFunctionName:
3684       ConversionDecls.append(Result.begin(), Result.end());
3685       break;
3686     }
3687   }
3688 
3689   // Handle our two special cases if we ended up having any. We arbitrarily use
3690   // the first declaration's name here because the name itself isn't part of
3691   // the key, only the kind of name is used.
3692   if (!ConstructorDecls.empty())
3693     Generator.insert(ConstructorDecls.front()->getDeclName(),
3694                      Trait.getData(ConstructorDecls), Trait);
3695   if (!ConversionDecls.empty())
3696     Generator.insert(ConversionDecls.front()->getDeclName(),
3697                      Trait.getData(ConversionDecls), Trait);
3698 
3699   // Create the on-disk hash table. Also emit the existing imported and
3700   // merged table if there is one.
3701   auto *Lookups = Chain ? Chain->getLoadedLookupTables(DC) : nullptr;
3702   Generator.emit(LookupTable, Trait, Lookups ? &Lookups->Table : nullptr);
3703 }
3704 
3705 /// \brief Write the block containing all of the declaration IDs
3706 /// visible from the given DeclContext.
3707 ///
3708 /// \returns the offset of the DECL_CONTEXT_VISIBLE block within the
3709 /// bitstream, or 0 if no block was written.
WriteDeclContextVisibleBlock(ASTContext & Context,DeclContext * DC)3710 uint64_t ASTWriter::WriteDeclContextVisibleBlock(ASTContext &Context,
3711                                                  DeclContext *DC) {
3712   // If we imported a key declaration of this namespace, write the visible
3713   // lookup results as an update record for it rather than including them
3714   // on this declaration. We will only look at key declarations on reload.
3715   if (isa<NamespaceDecl>(DC) && Chain &&
3716       Chain->getKeyDeclaration(cast<Decl>(DC))->isFromASTFile()) {
3717     // Only do this once, for the first local declaration of the namespace.
3718     for (auto *Prev = cast<NamespaceDecl>(DC)->getPreviousDecl(); Prev;
3719          Prev = Prev->getPreviousDecl())
3720       if (!Prev->isFromASTFile())
3721         return 0;
3722 
3723     // Note that we need to emit an update record for the primary context.
3724     UpdatedDeclContexts.insert(DC->getPrimaryContext());
3725 
3726     // Make sure all visible decls are written. They will be recorded later. We
3727     // do this using a side data structure so we can sort the names into
3728     // a deterministic order.
3729     StoredDeclsMap *Map = DC->getPrimaryContext()->buildLookup();
3730     SmallVector<std::pair<DeclarationName, DeclContext::lookup_result>, 16>
3731         LookupResults;
3732     if (Map) {
3733       LookupResults.reserve(Map->size());
3734       for (auto &Entry : *Map)
3735         LookupResults.push_back(
3736             std::make_pair(Entry.first, Entry.second.getLookupResult()));
3737     }
3738 
3739     std::sort(LookupResults.begin(), LookupResults.end(), llvm::less_first());
3740     for (auto &NameAndResult : LookupResults) {
3741       DeclarationName Name = NameAndResult.first;
3742       DeclContext::lookup_result Result = NameAndResult.second;
3743       if (Name.getNameKind() == DeclarationName::CXXConstructorName ||
3744           Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
3745         // We have to work around a name lookup bug here where negative lookup
3746         // results for these names get cached in namespace lookup tables (these
3747         // names should never be looked up in a namespace).
3748         assert(Result.empty() && "Cannot have a constructor or conversion "
3749                                  "function name in a namespace!");
3750         continue;
3751       }
3752 
3753       for (NamedDecl *ND : Result)
3754         if (!ND->isFromASTFile())
3755           GetDeclRef(ND);
3756     }
3757 
3758     return 0;
3759   }
3760 
3761   if (DC->getPrimaryContext() != DC)
3762     return 0;
3763 
3764   // Skip contexts which don't support name lookup.
3765   if (!DC->isLookupContext())
3766     return 0;
3767 
3768   // If not in C++, we perform name lookup for the translation unit via the
3769   // IdentifierInfo chains, don't bother to build a visible-declarations table.
3770   if (DC->isTranslationUnit() && !Context.getLangOpts().CPlusPlus)
3771     return 0;
3772 
3773   // Serialize the contents of the mapping used for lookup. Note that,
3774   // although we have two very different code paths, the serialized
3775   // representation is the same for both cases: a declaration name,
3776   // followed by a size, followed by references to the visible
3777   // declarations that have that name.
3778   uint64_t Offset = Stream.GetCurrentBitNo();
3779   StoredDeclsMap *Map = DC->buildLookup();
3780   if (!Map || Map->empty())
3781     return 0;
3782 
3783   // Create the on-disk hash table in a buffer.
3784   SmallString<4096> LookupTable;
3785   GenerateNameLookupTable(DC, LookupTable);
3786 
3787   // Write the lookup table
3788   RecordData::value_type Record[] = {DECL_CONTEXT_VISIBLE};
3789   Stream.EmitRecordWithBlob(DeclContextVisibleLookupAbbrev, Record,
3790                             LookupTable);
3791   ++NumVisibleDeclContexts;
3792   return Offset;
3793 }
3794 
3795 /// \brief Write an UPDATE_VISIBLE block for the given context.
3796 ///
3797 /// UPDATE_VISIBLE blocks contain the declarations that are added to an existing
3798 /// DeclContext in a dependent AST file. As such, they only exist for the TU
3799 /// (in C++), for namespaces, and for classes with forward-declared unscoped
3800 /// enumeration members (in C++11).
WriteDeclContextVisibleUpdate(const DeclContext * DC)3801 void ASTWriter::WriteDeclContextVisibleUpdate(const DeclContext *DC) {
3802   StoredDeclsMap *Map = DC->getLookupPtr();
3803   if (!Map || Map->empty())
3804     return;
3805 
3806   // Create the on-disk hash table in a buffer.
3807   SmallString<4096> LookupTable;
3808   GenerateNameLookupTable(DC, LookupTable);
3809 
3810   // If we're updating a namespace, select a key declaration as the key for the
3811   // update record; those are the only ones that will be checked on reload.
3812   if (isa<NamespaceDecl>(DC))
3813     DC = cast<DeclContext>(Chain->getKeyDeclaration(cast<Decl>(DC)));
3814 
3815   // Write the lookup table
3816   RecordData::value_type Record[] = {UPDATE_VISIBLE, getDeclID(cast<Decl>(DC))};
3817   Stream.EmitRecordWithBlob(UpdateVisibleAbbrev, Record, LookupTable);
3818 }
3819 
3820 /// \brief Write an FP_PRAGMA_OPTIONS block for the given FPOptions.
WriteFPPragmaOptions(const FPOptions & Opts)3821 void ASTWriter::WriteFPPragmaOptions(const FPOptions &Opts) {
3822   RecordData::value_type Record[] = {Opts.fp_contract};
3823   Stream.EmitRecord(FP_PRAGMA_OPTIONS, Record);
3824 }
3825 
3826 /// \brief Write an OPENCL_EXTENSIONS block for the given OpenCLOptions.
WriteOpenCLExtensions(Sema & SemaRef)3827 void ASTWriter::WriteOpenCLExtensions(Sema &SemaRef) {
3828   if (!SemaRef.Context.getLangOpts().OpenCL)
3829     return;
3830 
3831   const OpenCLOptions &Opts = SemaRef.getOpenCLOptions();
3832   RecordData Record;
3833 #define OPENCLEXT(nm)  Record.push_back(Opts.nm);
3834 #include "clang/Basic/OpenCLExtensions.def"
3835   Stream.EmitRecord(OPENCL_EXTENSIONS, Record);
3836 }
3837 
WriteObjCCategories()3838 void ASTWriter::WriteObjCCategories() {
3839   SmallVector<ObjCCategoriesInfo, 2> CategoriesMap;
3840   RecordData Categories;
3841 
3842   for (unsigned I = 0, N = ObjCClassesWithCategories.size(); I != N; ++I) {
3843     unsigned Size = 0;
3844     unsigned StartIndex = Categories.size();
3845 
3846     ObjCInterfaceDecl *Class = ObjCClassesWithCategories[I];
3847 
3848     // Allocate space for the size.
3849     Categories.push_back(0);
3850 
3851     // Add the categories.
3852     for (ObjCInterfaceDecl::known_categories_iterator
3853            Cat = Class->known_categories_begin(),
3854            CatEnd = Class->known_categories_end();
3855          Cat != CatEnd; ++Cat, ++Size) {
3856       assert(getDeclID(*Cat) != 0 && "Bogus category");
3857       AddDeclRef(*Cat, Categories);
3858     }
3859 
3860     // Update the size.
3861     Categories[StartIndex] = Size;
3862 
3863     // Record this interface -> category map.
3864     ObjCCategoriesInfo CatInfo = { getDeclID(Class), StartIndex };
3865     CategoriesMap.push_back(CatInfo);
3866   }
3867 
3868   // Sort the categories map by the definition ID, since the reader will be
3869   // performing binary searches on this information.
3870   llvm::array_pod_sort(CategoriesMap.begin(), CategoriesMap.end());
3871 
3872   // Emit the categories map.
3873   using namespace llvm;
3874 
3875   auto *Abbrev = new BitCodeAbbrev();
3876   Abbrev->Add(BitCodeAbbrevOp(OBJC_CATEGORIES_MAP));
3877   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // # of entries
3878   Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
3879   unsigned AbbrevID = Stream.EmitAbbrev(Abbrev);
3880 
3881   RecordData::value_type Record[] = {OBJC_CATEGORIES_MAP, CategoriesMap.size()};
3882   Stream.EmitRecordWithBlob(AbbrevID, Record,
3883                             reinterpret_cast<char *>(CategoriesMap.data()),
3884                             CategoriesMap.size() * sizeof(ObjCCategoriesInfo));
3885 
3886   // Emit the category lists.
3887   Stream.EmitRecord(OBJC_CATEGORIES, Categories);
3888 }
3889 
WriteLateParsedTemplates(Sema & SemaRef)3890 void ASTWriter::WriteLateParsedTemplates(Sema &SemaRef) {
3891   Sema::LateParsedTemplateMapT &LPTMap = SemaRef.LateParsedTemplateMap;
3892 
3893   if (LPTMap.empty())
3894     return;
3895 
3896   RecordData Record;
3897   for (auto LPTMapEntry : LPTMap) {
3898     const FunctionDecl *FD = LPTMapEntry.first;
3899     LateParsedTemplate *LPT = LPTMapEntry.second;
3900     AddDeclRef(FD, Record);
3901     AddDeclRef(LPT->D, Record);
3902     Record.push_back(LPT->Toks.size());
3903 
3904     for (const auto &Tok : LPT->Toks) {
3905       AddToken(Tok, Record);
3906     }
3907   }
3908   Stream.EmitRecord(LATE_PARSED_TEMPLATE, Record);
3909 }
3910 
3911 /// \brief Write the state of 'pragma clang optimize' at the end of the module.
WriteOptimizePragmaOptions(Sema & SemaRef)3912 void ASTWriter::WriteOptimizePragmaOptions(Sema &SemaRef) {
3913   RecordData Record;
3914   SourceLocation PragmaLoc = SemaRef.getOptimizeOffPragmaLocation();
3915   AddSourceLocation(PragmaLoc, Record);
3916   Stream.EmitRecord(OPTIMIZE_PRAGMA_OPTIONS, Record);
3917 }
3918 
3919 /// \brief Write the state of 'pragma ms_struct' at the end of the module.
WriteMSStructPragmaOptions(Sema & SemaRef)3920 void ASTWriter::WriteMSStructPragmaOptions(Sema &SemaRef) {
3921   RecordData Record;
3922   Record.push_back(SemaRef.MSStructPragmaOn ? PMSST_ON : PMSST_OFF);
3923   Stream.EmitRecord(MSSTRUCT_PRAGMA_OPTIONS, Record);
3924 }
3925 
3926 /// \brief Write the state of 'pragma pointers_to_members' at the end of the
3927 //module.
WriteMSPointersToMembersPragmaOptions(Sema & SemaRef)3928 void ASTWriter::WriteMSPointersToMembersPragmaOptions(Sema &SemaRef) {
3929   RecordData Record;
3930   Record.push_back(SemaRef.MSPointerToMemberRepresentationMethod);
3931   AddSourceLocation(SemaRef.ImplicitMSInheritanceAttrLoc, Record);
3932   Stream.EmitRecord(POINTERS_TO_MEMBERS_PRAGMA_OPTIONS, Record);
3933 }
3934 
WriteModuleFileExtension(Sema & SemaRef,ModuleFileExtensionWriter & Writer)3935 void ASTWriter::WriteModuleFileExtension(Sema &SemaRef,
3936                                          ModuleFileExtensionWriter &Writer) {
3937   // Enter the extension block.
3938   Stream.EnterSubblock(EXTENSION_BLOCK_ID, 4);
3939 
3940   // Emit the metadata record abbreviation.
3941   auto *Abv = new llvm::BitCodeAbbrev();
3942   Abv->Add(llvm::BitCodeAbbrevOp(EXTENSION_METADATA));
3943   Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
3944   Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
3945   Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
3946   Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
3947   Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::Blob));
3948   unsigned Abbrev = Stream.EmitAbbrev(Abv);
3949 
3950   // Emit the metadata record.
3951   RecordData Record;
3952   auto Metadata = Writer.getExtension()->getExtensionMetadata();
3953   Record.push_back(EXTENSION_METADATA);
3954   Record.push_back(Metadata.MajorVersion);
3955   Record.push_back(Metadata.MinorVersion);
3956   Record.push_back(Metadata.BlockName.size());
3957   Record.push_back(Metadata.UserInfo.size());
3958   SmallString<64> Buffer;
3959   Buffer += Metadata.BlockName;
3960   Buffer += Metadata.UserInfo;
3961   Stream.EmitRecordWithBlob(Abbrev, Record, Buffer);
3962 
3963   // Emit the contents of the extension block.
3964   Writer.writeExtensionContents(SemaRef, Stream);
3965 
3966   // Exit the extension block.
3967   Stream.ExitBlock();
3968 }
3969 
3970 //===----------------------------------------------------------------------===//
3971 // General Serialization Routines
3972 //===----------------------------------------------------------------------===//
3973 
3974 /// \brief Emit the list of attributes to the specified record.
AddAttributes(ArrayRef<const Attr * > Attrs)3975 void ASTRecordWriter::AddAttributes(ArrayRef<const Attr *> Attrs) {
3976   auto &Record = *this;
3977   Record.push_back(Attrs.size());
3978   for (const auto *A : Attrs) {
3979     Record.push_back(A->getKind()); // FIXME: stable encoding, target attrs
3980     Record.AddSourceRange(A->getRange());
3981 
3982 #include "clang/Serialization/AttrPCHWrite.inc"
3983 
3984   }
3985 }
3986 
AddToken(const Token & Tok,RecordDataImpl & Record)3987 void ASTWriter::AddToken(const Token &Tok, RecordDataImpl &Record) {
3988   AddSourceLocation(Tok.getLocation(), Record);
3989   Record.push_back(Tok.getLength());
3990 
3991   // FIXME: When reading literal tokens, reconstruct the literal pointer
3992   // if it is needed.
3993   AddIdentifierRef(Tok.getIdentifierInfo(), Record);
3994   // FIXME: Should translate token kind to a stable encoding.
3995   Record.push_back(Tok.getKind());
3996   // FIXME: Should translate token flags to a stable encoding.
3997   Record.push_back(Tok.getFlags());
3998 }
3999 
AddString(StringRef Str,RecordDataImpl & Record)4000 void ASTWriter::AddString(StringRef Str, RecordDataImpl &Record) {
4001   Record.push_back(Str.size());
4002   Record.insert(Record.end(), Str.begin(), Str.end());
4003 }
4004 
PreparePathForOutput(SmallVectorImpl<char> & Path)4005 bool ASTWriter::PreparePathForOutput(SmallVectorImpl<char> &Path) {
4006   assert(Context && "should have context when outputting path");
4007 
4008   bool Changed =
4009       cleanPathForOutput(Context->getSourceManager().getFileManager(), Path);
4010 
4011   // Remove a prefix to make the path relative, if relevant.
4012   const char *PathBegin = Path.data();
4013   const char *PathPtr =
4014       adjustFilenameForRelocatableAST(PathBegin, BaseDirectory);
4015   if (PathPtr != PathBegin) {
4016     Path.erase(Path.begin(), Path.begin() + (PathPtr - PathBegin));
4017     Changed = true;
4018   }
4019 
4020   return Changed;
4021 }
4022 
AddPath(StringRef Path,RecordDataImpl & Record)4023 void ASTWriter::AddPath(StringRef Path, RecordDataImpl &Record) {
4024   SmallString<128> FilePath(Path);
4025   PreparePathForOutput(FilePath);
4026   AddString(FilePath, Record);
4027 }
4028 
EmitRecordWithPath(unsigned Abbrev,RecordDataRef Record,StringRef Path)4029 void ASTWriter::EmitRecordWithPath(unsigned Abbrev, RecordDataRef Record,
4030                                    StringRef Path) {
4031   SmallString<128> FilePath(Path);
4032   PreparePathForOutput(FilePath);
4033   Stream.EmitRecordWithBlob(Abbrev, Record, FilePath);
4034 }
4035 
AddVersionTuple(const VersionTuple & Version,RecordDataImpl & Record)4036 void ASTWriter::AddVersionTuple(const VersionTuple &Version,
4037                                 RecordDataImpl &Record) {
4038   Record.push_back(Version.getMajor());
4039   if (Optional<unsigned> Minor = Version.getMinor())
4040     Record.push_back(*Minor + 1);
4041   else
4042     Record.push_back(0);
4043   if (Optional<unsigned> Subminor = Version.getSubminor())
4044     Record.push_back(*Subminor + 1);
4045   else
4046     Record.push_back(0);
4047 }
4048 
4049 /// \brief Note that the identifier II occurs at the given offset
4050 /// within the identifier table.
SetIdentifierOffset(const IdentifierInfo * II,uint32_t Offset)4051 void ASTWriter::SetIdentifierOffset(const IdentifierInfo *II, uint32_t Offset) {
4052   IdentID ID = IdentifierIDs[II];
4053   // Only store offsets new to this AST file. Other identifier names are looked
4054   // up earlier in the chain and thus don't need an offset.
4055   if (ID >= FirstIdentID)
4056     IdentifierOffsets[ID - FirstIdentID] = Offset;
4057 }
4058 
4059 /// \brief Note that the selector Sel occurs at the given offset
4060 /// within the method pool/selector table.
SetSelectorOffset(Selector Sel,uint32_t Offset)4061 void ASTWriter::SetSelectorOffset(Selector Sel, uint32_t Offset) {
4062   unsigned ID = SelectorIDs[Sel];
4063   assert(ID && "Unknown selector");
4064   // Don't record offsets for selectors that are also available in a different
4065   // file.
4066   if (ID < FirstSelectorID)
4067     return;
4068   SelectorOffsets[ID - FirstSelectorID] = Offset;
4069 }
4070 
ASTWriter(llvm::BitstreamWriter & Stream,ArrayRef<llvm::IntrusiveRefCntPtr<ModuleFileExtension>> Extensions,bool IncludeTimestamps)4071 ASTWriter::ASTWriter(
4072   llvm::BitstreamWriter &Stream,
4073   ArrayRef<llvm::IntrusiveRefCntPtr<ModuleFileExtension>> Extensions,
4074   bool IncludeTimestamps)
4075     : Stream(Stream), Context(nullptr), PP(nullptr), Chain(nullptr),
4076       WritingModule(nullptr), IncludeTimestamps(IncludeTimestamps),
4077       WritingAST(false), DoneWritingDeclsAndTypes(false),
4078       ASTHasCompilerErrors(false), FirstDeclID(NUM_PREDEF_DECL_IDS),
4079       NextDeclID(FirstDeclID), FirstTypeID(NUM_PREDEF_TYPE_IDS),
4080       NextTypeID(FirstTypeID), FirstIdentID(NUM_PREDEF_IDENT_IDS),
4081       NextIdentID(FirstIdentID), FirstMacroID(NUM_PREDEF_MACRO_IDS),
4082       NextMacroID(FirstMacroID), FirstSubmoduleID(NUM_PREDEF_SUBMODULE_IDS),
4083       NextSubmoduleID(FirstSubmoduleID),
4084       FirstSelectorID(NUM_PREDEF_SELECTOR_IDS), NextSelectorID(FirstSelectorID),
4085       NumStatements(0), NumMacros(0),
4086       NumLexicalDeclContexts(0), NumVisibleDeclContexts(0),
4087       TypeExtQualAbbrev(0), TypeFunctionProtoAbbrev(0), DeclParmVarAbbrev(0),
4088       DeclContextLexicalAbbrev(0), DeclContextVisibleLookupAbbrev(0),
4089       UpdateVisibleAbbrev(0), DeclRecordAbbrev(0), DeclTypedefAbbrev(0),
4090       DeclVarAbbrev(0), DeclFieldAbbrev(0), DeclEnumAbbrev(0),
4091       DeclObjCIvarAbbrev(0), DeclCXXMethodAbbrev(0), DeclRefExprAbbrev(0),
4092       CharacterLiteralAbbrev(0), IntegerLiteralAbbrev(0),
4093       ExprImplicitCastAbbrev(0) {
4094   for (const auto &Ext : Extensions) {
4095     if (auto Writer = Ext->createExtensionWriter(*this))
4096       ModuleFileExtensionWriters.push_back(std::move(Writer));
4097   }
4098 }
4099 
~ASTWriter()4100 ASTWriter::~ASTWriter() {
4101   llvm::DeleteContainerSeconds(FileDeclIDs);
4102 }
4103 
getLangOpts() const4104 const LangOptions &ASTWriter::getLangOpts() const {
4105   assert(WritingAST && "can't determine lang opts when not writing AST");
4106   return Context->getLangOpts();
4107 }
4108 
getTimestampForOutput(const FileEntry * E) const4109 time_t ASTWriter::getTimestampForOutput(const FileEntry *E) const {
4110   return IncludeTimestamps ? E->getModificationTime() : 0;
4111 }
4112 
WriteAST(Sema & SemaRef,const std::string & OutputFile,Module * WritingModule,StringRef isysroot,bool hasErrors)4113 uint64_t ASTWriter::WriteAST(Sema &SemaRef, const std::string &OutputFile,
4114                              Module *WritingModule, StringRef isysroot,
4115                              bool hasErrors) {
4116   WritingAST = true;
4117 
4118   ASTHasCompilerErrors = hasErrors;
4119 
4120   // Emit the file header.
4121   Stream.Emit((unsigned)'C', 8);
4122   Stream.Emit((unsigned)'P', 8);
4123   Stream.Emit((unsigned)'C', 8);
4124   Stream.Emit((unsigned)'H', 8);
4125 
4126   WriteBlockInfoBlock();
4127 
4128   Context = &SemaRef.Context;
4129   PP = &SemaRef.PP;
4130   this->WritingModule = WritingModule;
4131   ASTFileSignature Signature =
4132       WriteASTCore(SemaRef, isysroot, OutputFile, WritingModule);
4133   Context = nullptr;
4134   PP = nullptr;
4135   this->WritingModule = nullptr;
4136   this->BaseDirectory.clear();
4137 
4138   WritingAST = false;
4139   return Signature;
4140 }
4141 
4142 template<typename Vector>
AddLazyVectorDecls(ASTWriter & Writer,Vector & Vec,ASTWriter::RecordData & Record)4143 static void AddLazyVectorDecls(ASTWriter &Writer, Vector &Vec,
4144                                ASTWriter::RecordData &Record) {
4145   for (typename Vector::iterator I = Vec.begin(nullptr, true), E = Vec.end();
4146        I != E; ++I) {
4147     Writer.AddDeclRef(*I, Record);
4148   }
4149 }
4150 
WriteASTCore(Sema & SemaRef,StringRef isysroot,const std::string & OutputFile,Module * WritingModule)4151 uint64_t ASTWriter::WriteASTCore(Sema &SemaRef, StringRef isysroot,
4152                                  const std::string &OutputFile,
4153                                  Module *WritingModule) {
4154   using namespace llvm;
4155 
4156   bool isModule = WritingModule != nullptr;
4157 
4158   // Make sure that the AST reader knows to finalize itself.
4159   if (Chain)
4160     Chain->finalizeForWriting();
4161 
4162   ASTContext &Context = SemaRef.Context;
4163   Preprocessor &PP = SemaRef.PP;
4164 
4165   // Set up predefined declaration IDs.
4166   auto RegisterPredefDecl = [&] (Decl *D, PredefinedDeclIDs ID) {
4167     if (D) {
4168       assert(D->isCanonicalDecl() && "predefined decl is not canonical");
4169       DeclIDs[D] = ID;
4170     }
4171   };
4172   RegisterPredefDecl(Context.getTranslationUnitDecl(),
4173                      PREDEF_DECL_TRANSLATION_UNIT_ID);
4174   RegisterPredefDecl(Context.ObjCIdDecl, PREDEF_DECL_OBJC_ID_ID);
4175   RegisterPredefDecl(Context.ObjCSelDecl, PREDEF_DECL_OBJC_SEL_ID);
4176   RegisterPredefDecl(Context.ObjCClassDecl, PREDEF_DECL_OBJC_CLASS_ID);
4177   RegisterPredefDecl(Context.ObjCProtocolClassDecl,
4178                      PREDEF_DECL_OBJC_PROTOCOL_ID);
4179   RegisterPredefDecl(Context.Int128Decl, PREDEF_DECL_INT_128_ID);
4180   RegisterPredefDecl(Context.UInt128Decl, PREDEF_DECL_UNSIGNED_INT_128_ID);
4181   RegisterPredefDecl(Context.ObjCInstanceTypeDecl,
4182                      PREDEF_DECL_OBJC_INSTANCETYPE_ID);
4183   RegisterPredefDecl(Context.BuiltinVaListDecl, PREDEF_DECL_BUILTIN_VA_LIST_ID);
4184   RegisterPredefDecl(Context.VaListTagDecl, PREDEF_DECL_VA_LIST_TAG);
4185   RegisterPredefDecl(Context.BuiltinMSVaListDecl,
4186                      PREDEF_DECL_BUILTIN_MS_VA_LIST_ID);
4187   RegisterPredefDecl(Context.ExternCContext, PREDEF_DECL_EXTERN_C_CONTEXT_ID);
4188   RegisterPredefDecl(Context.MakeIntegerSeqDecl,
4189                      PREDEF_DECL_MAKE_INTEGER_SEQ_ID);
4190   RegisterPredefDecl(Context.CFConstantStringTypeDecl,
4191                      PREDEF_DECL_CF_CONSTANT_STRING_ID);
4192   RegisterPredefDecl(Context.CFConstantStringTagDecl,
4193                      PREDEF_DECL_CF_CONSTANT_STRING_TAG_ID);
4194   RegisterPredefDecl(Context.TypePackElementDecl,
4195                      PREDEF_DECL_TYPE_PACK_ELEMENT_ID);
4196 
4197   // Build a record containing all of the tentative definitions in this file, in
4198   // TentativeDefinitions order.  Generally, this record will be empty for
4199   // headers.
4200   RecordData TentativeDefinitions;
4201   AddLazyVectorDecls(*this, SemaRef.TentativeDefinitions, TentativeDefinitions);
4202 
4203   // Build a record containing all of the file scoped decls in this file.
4204   RecordData UnusedFileScopedDecls;
4205   if (!isModule)
4206     AddLazyVectorDecls(*this, SemaRef.UnusedFileScopedDecls,
4207                        UnusedFileScopedDecls);
4208 
4209   // Build a record containing all of the delegating constructors we still need
4210   // to resolve.
4211   RecordData DelegatingCtorDecls;
4212   if (!isModule)
4213     AddLazyVectorDecls(*this, SemaRef.DelegatingCtorDecls, DelegatingCtorDecls);
4214 
4215   // Write the set of weak, undeclared identifiers. We always write the
4216   // entire table, since later PCH files in a PCH chain are only interested in
4217   // the results at the end of the chain.
4218   RecordData WeakUndeclaredIdentifiers;
4219   for (auto &WeakUndeclaredIdentifier : SemaRef.WeakUndeclaredIdentifiers) {
4220     IdentifierInfo *II = WeakUndeclaredIdentifier.first;
4221     WeakInfo &WI = WeakUndeclaredIdentifier.second;
4222     AddIdentifierRef(II, WeakUndeclaredIdentifiers);
4223     AddIdentifierRef(WI.getAlias(), WeakUndeclaredIdentifiers);
4224     AddSourceLocation(WI.getLocation(), WeakUndeclaredIdentifiers);
4225     WeakUndeclaredIdentifiers.push_back(WI.getUsed());
4226   }
4227 
4228   // Build a record containing all of the ext_vector declarations.
4229   RecordData ExtVectorDecls;
4230   AddLazyVectorDecls(*this, SemaRef.ExtVectorDecls, ExtVectorDecls);
4231 
4232   // Build a record containing all of the VTable uses information.
4233   RecordData VTableUses;
4234   if (!SemaRef.VTableUses.empty()) {
4235     for (unsigned I = 0, N = SemaRef.VTableUses.size(); I != N; ++I) {
4236       AddDeclRef(SemaRef.VTableUses[I].first, VTableUses);
4237       AddSourceLocation(SemaRef.VTableUses[I].second, VTableUses);
4238       VTableUses.push_back(SemaRef.VTablesUsed[SemaRef.VTableUses[I].first]);
4239     }
4240   }
4241 
4242   // Build a record containing all of the UnusedLocalTypedefNameCandidates.
4243   RecordData UnusedLocalTypedefNameCandidates;
4244   for (const TypedefNameDecl *TD : SemaRef.UnusedLocalTypedefNameCandidates)
4245     AddDeclRef(TD, UnusedLocalTypedefNameCandidates);
4246 
4247   // Build a record containing all of pending implicit instantiations.
4248   RecordData PendingInstantiations;
4249   for (const auto &I : SemaRef.PendingInstantiations) {
4250     AddDeclRef(I.first, PendingInstantiations);
4251     AddSourceLocation(I.second, PendingInstantiations);
4252   }
4253   assert(SemaRef.PendingLocalImplicitInstantiations.empty() &&
4254          "There are local ones at end of translation unit!");
4255 
4256   // Build a record containing some declaration references.
4257   RecordData SemaDeclRefs;
4258   if (SemaRef.StdNamespace || SemaRef.StdBadAlloc) {
4259     AddDeclRef(SemaRef.getStdNamespace(), SemaDeclRefs);
4260     AddDeclRef(SemaRef.getStdBadAlloc(), SemaDeclRefs);
4261   }
4262 
4263   RecordData CUDASpecialDeclRefs;
4264   if (Context.getcudaConfigureCallDecl()) {
4265     AddDeclRef(Context.getcudaConfigureCallDecl(), CUDASpecialDeclRefs);
4266   }
4267 
4268   // Build a record containing all of the known namespaces.
4269   RecordData KnownNamespaces;
4270   for (const auto &I : SemaRef.KnownNamespaces) {
4271     if (!I.second)
4272       AddDeclRef(I.first, KnownNamespaces);
4273   }
4274 
4275   // Build a record of all used, undefined objects that require definitions.
4276   RecordData UndefinedButUsed;
4277 
4278   SmallVector<std::pair<NamedDecl *, SourceLocation>, 16> Undefined;
4279   SemaRef.getUndefinedButUsed(Undefined);
4280   for (const auto &I : Undefined) {
4281     AddDeclRef(I.first, UndefinedButUsed);
4282     AddSourceLocation(I.second, UndefinedButUsed);
4283   }
4284 
4285   // Build a record containing all delete-expressions that we would like to
4286   // analyze later in AST.
4287   RecordData DeleteExprsToAnalyze;
4288 
4289   for (const auto &DeleteExprsInfo :
4290        SemaRef.getMismatchingDeleteExpressions()) {
4291     AddDeclRef(DeleteExprsInfo.first, DeleteExprsToAnalyze);
4292     DeleteExprsToAnalyze.push_back(DeleteExprsInfo.second.size());
4293     for (const auto &DeleteLoc : DeleteExprsInfo.second) {
4294       AddSourceLocation(DeleteLoc.first, DeleteExprsToAnalyze);
4295       DeleteExprsToAnalyze.push_back(DeleteLoc.second);
4296     }
4297   }
4298 
4299   // Write the control block
4300   uint64_t Signature = WriteControlBlock(PP, Context, isysroot, OutputFile);
4301 
4302   // Write the remaining AST contents.
4303   Stream.EnterSubblock(AST_BLOCK_ID, 5);
4304 
4305   // This is so that older clang versions, before the introduction
4306   // of the control block, can read and reject the newer PCH format.
4307   {
4308     RecordData Record = {VERSION_MAJOR};
4309     Stream.EmitRecord(METADATA_OLD_FORMAT, Record);
4310   }
4311 
4312   // Create a lexical update block containing all of the declarations in the
4313   // translation unit that do not come from other AST files.
4314   const TranslationUnitDecl *TU = Context.getTranslationUnitDecl();
4315   SmallVector<uint32_t, 128> NewGlobalKindDeclPairs;
4316   for (const auto *D : TU->noload_decls()) {
4317     if (!D->isFromASTFile()) {
4318       NewGlobalKindDeclPairs.push_back(D->getKind());
4319       NewGlobalKindDeclPairs.push_back(GetDeclRef(D));
4320     }
4321   }
4322 
4323   auto *Abv = new llvm::BitCodeAbbrev();
4324   Abv->Add(llvm::BitCodeAbbrevOp(TU_UPDATE_LEXICAL));
4325   Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::Blob));
4326   unsigned TuUpdateLexicalAbbrev = Stream.EmitAbbrev(Abv);
4327   {
4328     RecordData::value_type Record[] = {TU_UPDATE_LEXICAL};
4329     Stream.EmitRecordWithBlob(TuUpdateLexicalAbbrev, Record,
4330                               bytes(NewGlobalKindDeclPairs));
4331   }
4332 
4333   // And a visible updates block for the translation unit.
4334   Abv = new llvm::BitCodeAbbrev();
4335   Abv->Add(llvm::BitCodeAbbrevOp(UPDATE_VISIBLE));
4336   Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
4337   Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::Blob));
4338   UpdateVisibleAbbrev = Stream.EmitAbbrev(Abv);
4339   WriteDeclContextVisibleUpdate(TU);
4340 
4341   // If we have any extern "C" names, write out a visible update for them.
4342   if (Context.ExternCContext)
4343     WriteDeclContextVisibleUpdate(Context.ExternCContext);
4344 
4345   // If the translation unit has an anonymous namespace, and we don't already
4346   // have an update block for it, write it as an update block.
4347   // FIXME: Why do we not do this if there's already an update block?
4348   if (NamespaceDecl *NS = TU->getAnonymousNamespace()) {
4349     ASTWriter::UpdateRecord &Record = DeclUpdates[TU];
4350     if (Record.empty())
4351       Record.push_back(DeclUpdate(UPD_CXX_ADDED_ANONYMOUS_NAMESPACE, NS));
4352   }
4353 
4354   // Add update records for all mangling numbers and static local numbers.
4355   // These aren't really update records, but this is a convenient way of
4356   // tagging this rare extra data onto the declarations.
4357   for (const auto &Number : Context.MangleNumbers)
4358     if (!Number.first->isFromASTFile())
4359       DeclUpdates[Number.first].push_back(DeclUpdate(UPD_MANGLING_NUMBER,
4360                                                      Number.second));
4361   for (const auto &Number : Context.StaticLocalNumbers)
4362     if (!Number.first->isFromASTFile())
4363       DeclUpdates[Number.first].push_back(DeclUpdate(UPD_STATIC_LOCAL_NUMBER,
4364                                                      Number.second));
4365 
4366   // Make sure visible decls, added to DeclContexts previously loaded from
4367   // an AST file, are registered for serialization.
4368   for (const auto *I : UpdatingVisibleDecls) {
4369     GetDeclRef(I);
4370   }
4371 
4372   // Make sure all decls associated with an identifier are registered for
4373   // serialization, if we're storing decls with identifiers.
4374   if (!WritingModule || !getLangOpts().CPlusPlus) {
4375     llvm::SmallVector<const IdentifierInfo*, 256> IIs;
4376     for (const auto &ID : PP.getIdentifierTable()) {
4377       const IdentifierInfo *II = ID.second;
4378       if (!Chain || !II->isFromAST() || II->hasChangedSinceDeserialization())
4379         IIs.push_back(II);
4380     }
4381     // Sort the identifiers to visit based on their name.
4382     std::sort(IIs.begin(), IIs.end(), llvm::less_ptr<IdentifierInfo>());
4383     for (const IdentifierInfo *II : IIs) {
4384       for (IdentifierResolver::iterator D = SemaRef.IdResolver.begin(II),
4385                                      DEnd = SemaRef.IdResolver.end();
4386            D != DEnd; ++D) {
4387         GetDeclRef(*D);
4388       }
4389     }
4390   }
4391 
4392   // For method pool in the module, if it contains an entry for a selector,
4393   // the entry should be complete, containing everything introduced by that
4394   // module and all modules it imports. It's possible that the entry is out of
4395   // date, so we need to pull in the new content here.
4396 
4397   // It's possible that updateOutOfDateSelector can update SelectorIDs. To be
4398   // safe, we copy all selectors out.
4399   llvm::SmallVector<Selector, 256> AllSelectors;
4400   for (auto &SelectorAndID : SelectorIDs)
4401     AllSelectors.push_back(SelectorAndID.first);
4402   for (auto &Selector : AllSelectors)
4403     SemaRef.updateOutOfDateSelector(Selector);
4404 
4405   // Form the record of special types.
4406   RecordData SpecialTypes;
4407   AddTypeRef(Context.getRawCFConstantStringType(), SpecialTypes);
4408   AddTypeRef(Context.getFILEType(), SpecialTypes);
4409   AddTypeRef(Context.getjmp_bufType(), SpecialTypes);
4410   AddTypeRef(Context.getsigjmp_bufType(), SpecialTypes);
4411   AddTypeRef(Context.ObjCIdRedefinitionType, SpecialTypes);
4412   AddTypeRef(Context.ObjCClassRedefinitionType, SpecialTypes);
4413   AddTypeRef(Context.ObjCSelRedefinitionType, SpecialTypes);
4414   AddTypeRef(Context.getucontext_tType(), SpecialTypes);
4415 
4416   if (Chain) {
4417     // Write the mapping information describing our module dependencies and how
4418     // each of those modules were mapped into our own offset/ID space, so that
4419     // the reader can build the appropriate mapping to its own offset/ID space.
4420     // The map consists solely of a blob with the following format:
4421     // *(module-name-len:i16 module-name:len*i8
4422     //   source-location-offset:i32
4423     //   identifier-id:i32
4424     //   preprocessed-entity-id:i32
4425     //   macro-definition-id:i32
4426     //   submodule-id:i32
4427     //   selector-id:i32
4428     //   declaration-id:i32
4429     //   c++-base-specifiers-id:i32
4430     //   type-id:i32)
4431     //
4432     auto *Abbrev = new BitCodeAbbrev();
4433     Abbrev->Add(BitCodeAbbrevOp(MODULE_OFFSET_MAP));
4434     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
4435     unsigned ModuleOffsetMapAbbrev = Stream.EmitAbbrev(Abbrev);
4436     SmallString<2048> Buffer;
4437     {
4438       llvm::raw_svector_ostream Out(Buffer);
4439       for (ModuleFile *M : Chain->ModuleMgr) {
4440         using namespace llvm::support;
4441         endian::Writer<little> LE(Out);
4442         StringRef FileName = M->FileName;
4443         LE.write<uint16_t>(FileName.size());
4444         Out.write(FileName.data(), FileName.size());
4445 
4446         // Note: if a base ID was uint max, it would not be possible to load
4447         // another module after it or have more than one entity inside it.
4448         uint32_t None = std::numeric_limits<uint32_t>::max();
4449 
4450         auto writeBaseIDOrNone = [&](uint32_t BaseID, bool ShouldWrite) {
4451           assert(BaseID < std::numeric_limits<uint32_t>::max() && "base id too high");
4452           if (ShouldWrite)
4453             LE.write<uint32_t>(BaseID);
4454           else
4455             LE.write<uint32_t>(None);
4456         };
4457 
4458         // These values should be unique within a chain, since they will be read
4459         // as keys into ContinuousRangeMaps.
4460         writeBaseIDOrNone(M->SLocEntryBaseOffset, M->LocalNumSLocEntries);
4461         writeBaseIDOrNone(M->BaseIdentifierID, M->LocalNumIdentifiers);
4462         writeBaseIDOrNone(M->BaseMacroID, M->LocalNumMacros);
4463         writeBaseIDOrNone(M->BasePreprocessedEntityID,
4464                           M->NumPreprocessedEntities);
4465         writeBaseIDOrNone(M->BaseSubmoduleID, M->LocalNumSubmodules);
4466         writeBaseIDOrNone(M->BaseSelectorID, M->LocalNumSelectors);
4467         writeBaseIDOrNone(M->BaseDeclID, M->LocalNumDecls);
4468         writeBaseIDOrNone(M->BaseTypeIndex, M->LocalNumTypes);
4469       }
4470     }
4471     RecordData::value_type Record[] = {MODULE_OFFSET_MAP};
4472     Stream.EmitRecordWithBlob(ModuleOffsetMapAbbrev, Record,
4473                               Buffer.data(), Buffer.size());
4474   }
4475 
4476   RecordData DeclUpdatesOffsetsRecord;
4477 
4478   // Keep writing types, declarations, and declaration update records
4479   // until we've emitted all of them.
4480   Stream.EnterSubblock(DECLTYPES_BLOCK_ID, /*bits for abbreviations*/5);
4481   WriteTypeAbbrevs();
4482   WriteDeclAbbrevs();
4483   do {
4484     WriteDeclUpdatesBlocks(DeclUpdatesOffsetsRecord);
4485     while (!DeclTypesToEmit.empty()) {
4486       DeclOrType DOT = DeclTypesToEmit.front();
4487       DeclTypesToEmit.pop();
4488       if (DOT.isType())
4489         WriteType(DOT.getType());
4490       else
4491         WriteDecl(Context, DOT.getDecl());
4492     }
4493   } while (!DeclUpdates.empty());
4494   Stream.ExitBlock();
4495 
4496   DoneWritingDeclsAndTypes = true;
4497 
4498   // These things can only be done once we've written out decls and types.
4499   WriteTypeDeclOffsets();
4500   if (!DeclUpdatesOffsetsRecord.empty())
4501     Stream.EmitRecord(DECL_UPDATE_OFFSETS, DeclUpdatesOffsetsRecord);
4502   WriteFileDeclIDsMap();
4503   WriteSourceManagerBlock(Context.getSourceManager(), PP);
4504   WriteComments();
4505   WritePreprocessor(PP, isModule);
4506   WriteHeaderSearch(PP.getHeaderSearchInfo());
4507   WriteSelectors(SemaRef);
4508   WriteReferencedSelectorsPool(SemaRef);
4509   WriteLateParsedTemplates(SemaRef);
4510   WriteIdentifierTable(PP, SemaRef.IdResolver, isModule);
4511   WriteFPPragmaOptions(SemaRef.getFPOptions());
4512   WriteOpenCLExtensions(SemaRef);
4513   WritePragmaDiagnosticMappings(Context.getDiagnostics(), isModule);
4514 
4515   // If we're emitting a module, write out the submodule information.
4516   if (WritingModule)
4517     WriteSubmodules(WritingModule);
4518 
4519   Stream.EmitRecord(SPECIAL_TYPES, SpecialTypes);
4520 
4521   // Write the record containing external, unnamed definitions.
4522   if (!EagerlyDeserializedDecls.empty())
4523     Stream.EmitRecord(EAGERLY_DESERIALIZED_DECLS, EagerlyDeserializedDecls);
4524 
4525   // Write the record containing tentative definitions.
4526   if (!TentativeDefinitions.empty())
4527     Stream.EmitRecord(TENTATIVE_DEFINITIONS, TentativeDefinitions);
4528 
4529   // Write the record containing unused file scoped decls.
4530   if (!UnusedFileScopedDecls.empty())
4531     Stream.EmitRecord(UNUSED_FILESCOPED_DECLS, UnusedFileScopedDecls);
4532 
4533   // Write the record containing weak undeclared identifiers.
4534   if (!WeakUndeclaredIdentifiers.empty())
4535     Stream.EmitRecord(WEAK_UNDECLARED_IDENTIFIERS,
4536                       WeakUndeclaredIdentifiers);
4537 
4538   // Write the record containing ext_vector type names.
4539   if (!ExtVectorDecls.empty())
4540     Stream.EmitRecord(EXT_VECTOR_DECLS, ExtVectorDecls);
4541 
4542   // Write the record containing VTable uses information.
4543   if (!VTableUses.empty())
4544     Stream.EmitRecord(VTABLE_USES, VTableUses);
4545 
4546   // Write the record containing potentially unused local typedefs.
4547   if (!UnusedLocalTypedefNameCandidates.empty())
4548     Stream.EmitRecord(UNUSED_LOCAL_TYPEDEF_NAME_CANDIDATES,
4549                       UnusedLocalTypedefNameCandidates);
4550 
4551   // Write the record containing pending implicit instantiations.
4552   if (!PendingInstantiations.empty())
4553     Stream.EmitRecord(PENDING_IMPLICIT_INSTANTIATIONS, PendingInstantiations);
4554 
4555   // Write the record containing declaration references of Sema.
4556   if (!SemaDeclRefs.empty())
4557     Stream.EmitRecord(SEMA_DECL_REFS, SemaDeclRefs);
4558 
4559   // Write the record containing CUDA-specific declaration references.
4560   if (!CUDASpecialDeclRefs.empty())
4561     Stream.EmitRecord(CUDA_SPECIAL_DECL_REFS, CUDASpecialDeclRefs);
4562 
4563   // Write the delegating constructors.
4564   if (!DelegatingCtorDecls.empty())
4565     Stream.EmitRecord(DELEGATING_CTORS, DelegatingCtorDecls);
4566 
4567   // Write the known namespaces.
4568   if (!KnownNamespaces.empty())
4569     Stream.EmitRecord(KNOWN_NAMESPACES, KnownNamespaces);
4570 
4571   // Write the undefined internal functions and variables, and inline functions.
4572   if (!UndefinedButUsed.empty())
4573     Stream.EmitRecord(UNDEFINED_BUT_USED, UndefinedButUsed);
4574 
4575   if (!DeleteExprsToAnalyze.empty())
4576     Stream.EmitRecord(DELETE_EXPRS_TO_ANALYZE, DeleteExprsToAnalyze);
4577 
4578   // Write the visible updates to DeclContexts.
4579   for (auto *DC : UpdatedDeclContexts)
4580     WriteDeclContextVisibleUpdate(DC);
4581 
4582   if (!WritingModule) {
4583     // Write the submodules that were imported, if any.
4584     struct ModuleInfo {
4585       uint64_t ID;
4586       Module *M;
4587       ModuleInfo(uint64_t ID, Module *M) : ID(ID), M(M) {}
4588     };
4589     llvm::SmallVector<ModuleInfo, 64> Imports;
4590     for (const auto *I : Context.local_imports()) {
4591       assert(SubmoduleIDs.find(I->getImportedModule()) != SubmoduleIDs.end());
4592       Imports.push_back(ModuleInfo(SubmoduleIDs[I->getImportedModule()],
4593                          I->getImportedModule()));
4594     }
4595 
4596     if (!Imports.empty()) {
4597       auto Cmp = [](const ModuleInfo &A, const ModuleInfo &B) {
4598         return A.ID < B.ID;
4599       };
4600       auto Eq = [](const ModuleInfo &A, const ModuleInfo &B) {
4601         return A.ID == B.ID;
4602       };
4603 
4604       // Sort and deduplicate module IDs.
4605       std::sort(Imports.begin(), Imports.end(), Cmp);
4606       Imports.erase(std::unique(Imports.begin(), Imports.end(), Eq),
4607                     Imports.end());
4608 
4609       RecordData ImportedModules;
4610       for (const auto &Import : Imports) {
4611         ImportedModules.push_back(Import.ID);
4612         // FIXME: If the module has macros imported then later has declarations
4613         // imported, this location won't be the right one as a location for the
4614         // declaration imports.
4615         AddSourceLocation(PP.getModuleImportLoc(Import.M), ImportedModules);
4616       }
4617 
4618       Stream.EmitRecord(IMPORTED_MODULES, ImportedModules);
4619     }
4620   }
4621 
4622   WriteObjCCategories();
4623   if(!WritingModule) {
4624     WriteOptimizePragmaOptions(SemaRef);
4625     WriteMSStructPragmaOptions(SemaRef);
4626     WriteMSPointersToMembersPragmaOptions(SemaRef);
4627   }
4628 
4629   // Some simple statistics
4630   RecordData::value_type Record[] = {
4631       NumStatements, NumMacros, NumLexicalDeclContexts, NumVisibleDeclContexts};
4632   Stream.EmitRecord(STATISTICS, Record);
4633   Stream.ExitBlock();
4634 
4635   // Write the module file extension blocks.
4636   for (const auto &ExtWriter : ModuleFileExtensionWriters)
4637     WriteModuleFileExtension(SemaRef, *ExtWriter);
4638 
4639   return Signature;
4640 }
4641 
WriteDeclUpdatesBlocks(RecordDataImpl & OffsetsRecord)4642 void ASTWriter::WriteDeclUpdatesBlocks(RecordDataImpl &OffsetsRecord) {
4643   if (DeclUpdates.empty())
4644     return;
4645 
4646   DeclUpdateMap LocalUpdates;
4647   LocalUpdates.swap(DeclUpdates);
4648 
4649   for (auto &DeclUpdate : LocalUpdates) {
4650     const Decl *D = DeclUpdate.first;
4651 
4652     bool HasUpdatedBody = false;
4653     RecordData RecordData;
4654     ASTRecordWriter Record(*this, RecordData);
4655     for (auto &Update : DeclUpdate.second) {
4656       DeclUpdateKind Kind = (DeclUpdateKind)Update.getKind();
4657 
4658       // An updated body is emitted last, so that the reader doesn't need
4659       // to skip over the lazy body to reach statements for other records.
4660       if (Kind == UPD_CXX_ADDED_FUNCTION_DEFINITION)
4661         HasUpdatedBody = true;
4662       else
4663         Record.push_back(Kind);
4664 
4665       switch (Kind) {
4666       case UPD_CXX_ADDED_IMPLICIT_MEMBER:
4667       case UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION:
4668       case UPD_CXX_ADDED_ANONYMOUS_NAMESPACE:
4669         assert(Update.getDecl() && "no decl to add?");
4670         Record.push_back(GetDeclRef(Update.getDecl()));
4671         break;
4672 
4673       case UPD_CXX_ADDED_FUNCTION_DEFINITION:
4674         break;
4675 
4676       case UPD_CXX_INSTANTIATED_STATIC_DATA_MEMBER:
4677         Record.AddSourceLocation(Update.getLoc());
4678         break;
4679 
4680       case UPD_CXX_INSTANTIATED_DEFAULT_ARGUMENT:
4681         Record.AddStmt(const_cast<Expr *>(
4682             cast<ParmVarDecl>(Update.getDecl())->getDefaultArg()));
4683         break;
4684 
4685       case UPD_CXX_INSTANTIATED_CLASS_DEFINITION: {
4686         auto *RD = cast<CXXRecordDecl>(D);
4687         UpdatedDeclContexts.insert(RD->getPrimaryContext());
4688         Record.AddCXXDefinitionData(RD);
4689         Record.AddOffset(WriteDeclContextLexicalBlock(
4690             *Context, const_cast<CXXRecordDecl *>(RD)));
4691 
4692         // This state is sometimes updated by template instantiation, when we
4693         // switch from the specialization referring to the template declaration
4694         // to it referring to the template definition.
4695         if (auto *MSInfo = RD->getMemberSpecializationInfo()) {
4696           Record.push_back(MSInfo->getTemplateSpecializationKind());
4697           Record.AddSourceLocation(MSInfo->getPointOfInstantiation());
4698         } else {
4699           auto *Spec = cast<ClassTemplateSpecializationDecl>(RD);
4700           Record.push_back(Spec->getTemplateSpecializationKind());
4701           Record.AddSourceLocation(Spec->getPointOfInstantiation());
4702 
4703           // The instantiation might have been resolved to a partial
4704           // specialization. If so, record which one.
4705           auto From = Spec->getInstantiatedFrom();
4706           if (auto PartialSpec =
4707                 From.dyn_cast<ClassTemplatePartialSpecializationDecl*>()) {
4708             Record.push_back(true);
4709             Record.AddDeclRef(PartialSpec);
4710             Record.AddTemplateArgumentList(
4711                 &Spec->getTemplateInstantiationArgs());
4712           } else {
4713             Record.push_back(false);
4714           }
4715         }
4716         Record.push_back(RD->getTagKind());
4717         Record.AddSourceLocation(RD->getLocation());
4718         Record.AddSourceLocation(RD->getLocStart());
4719         Record.AddSourceLocation(RD->getRBraceLoc());
4720 
4721         // Instantiation may change attributes; write them all out afresh.
4722         Record.push_back(D->hasAttrs());
4723         if (D->hasAttrs())
4724           Record.AddAttributes(D->getAttrs());
4725 
4726         // FIXME: Ensure we don't get here for explicit instantiations.
4727         break;
4728       }
4729 
4730       case UPD_CXX_RESOLVED_DTOR_DELETE:
4731         Record.AddDeclRef(Update.getDecl());
4732         break;
4733 
4734       case UPD_CXX_RESOLVED_EXCEPTION_SPEC:
4735         addExceptionSpec(
4736             cast<FunctionDecl>(D)->getType()->castAs<FunctionProtoType>(),
4737             Record);
4738         break;
4739 
4740       case UPD_CXX_DEDUCED_RETURN_TYPE:
4741         Record.push_back(GetOrCreateTypeID(Update.getType()));
4742         break;
4743 
4744       case UPD_DECL_MARKED_USED:
4745         break;
4746 
4747       case UPD_MANGLING_NUMBER:
4748       case UPD_STATIC_LOCAL_NUMBER:
4749         Record.push_back(Update.getNumber());
4750         break;
4751 
4752       case UPD_DECL_MARKED_OPENMP_THREADPRIVATE:
4753         Record.AddSourceRange(
4754             D->getAttr<OMPThreadPrivateDeclAttr>()->getRange());
4755         break;
4756 
4757       case UPD_DECL_MARKED_OPENMP_DECLARETARGET:
4758         Record.AddSourceRange(
4759             D->getAttr<OMPDeclareTargetDeclAttr>()->getRange());
4760         break;
4761 
4762       case UPD_DECL_EXPORTED:
4763         Record.push_back(getSubmoduleID(Update.getModule()));
4764         break;
4765 
4766       case UPD_ADDED_ATTR_TO_RECORD:
4767         Record.AddAttributes(llvm::makeArrayRef(Update.getAttr()));
4768         break;
4769       }
4770     }
4771 
4772     if (HasUpdatedBody) {
4773       const auto *Def = cast<FunctionDecl>(D);
4774       Record.push_back(UPD_CXX_ADDED_FUNCTION_DEFINITION);
4775       Record.push_back(Def->isInlined());
4776       Record.AddSourceLocation(Def->getInnerLocStart());
4777       Record.AddFunctionDefinition(Def);
4778     }
4779 
4780     OffsetsRecord.push_back(GetDeclRef(D));
4781     OffsetsRecord.push_back(Record.Emit(DECL_UPDATES));
4782   }
4783 }
4784 
AddSourceLocation(SourceLocation Loc,RecordDataImpl & Record)4785 void ASTWriter::AddSourceLocation(SourceLocation Loc, RecordDataImpl &Record) {
4786   uint32_t Raw = Loc.getRawEncoding();
4787   Record.push_back((Raw << 1) | (Raw >> 31));
4788 }
4789 
AddSourceRange(SourceRange Range,RecordDataImpl & Record)4790 void ASTWriter::AddSourceRange(SourceRange Range, RecordDataImpl &Record) {
4791   AddSourceLocation(Range.getBegin(), Record);
4792   AddSourceLocation(Range.getEnd(), Record);
4793 }
4794 
AddAPInt(const llvm::APInt & Value)4795 void ASTRecordWriter::AddAPInt(const llvm::APInt &Value) {
4796   Record->push_back(Value.getBitWidth());
4797   const uint64_t *Words = Value.getRawData();
4798   Record->append(Words, Words + Value.getNumWords());
4799 }
4800 
AddAPSInt(const llvm::APSInt & Value)4801 void ASTRecordWriter::AddAPSInt(const llvm::APSInt &Value) {
4802   Record->push_back(Value.isUnsigned());
4803   AddAPInt(Value);
4804 }
4805 
AddAPFloat(const llvm::APFloat & Value)4806 void ASTRecordWriter::AddAPFloat(const llvm::APFloat &Value) {
4807   AddAPInt(Value.bitcastToAPInt());
4808 }
4809 
AddIdentifierRef(const IdentifierInfo * II,RecordDataImpl & Record)4810 void ASTWriter::AddIdentifierRef(const IdentifierInfo *II, RecordDataImpl &Record) {
4811   Record.push_back(getIdentifierRef(II));
4812 }
4813 
getIdentifierRef(const IdentifierInfo * II)4814 IdentID ASTWriter::getIdentifierRef(const IdentifierInfo *II) {
4815   if (!II)
4816     return 0;
4817 
4818   IdentID &ID = IdentifierIDs[II];
4819   if (ID == 0)
4820     ID = NextIdentID++;
4821   return ID;
4822 }
4823 
getMacroRef(MacroInfo * MI,const IdentifierInfo * Name)4824 MacroID ASTWriter::getMacroRef(MacroInfo *MI, const IdentifierInfo *Name) {
4825   // Don't emit builtin macros like __LINE__ to the AST file unless they
4826   // have been redefined by the header (in which case they are not
4827   // isBuiltinMacro).
4828   if (!MI || MI->isBuiltinMacro())
4829     return 0;
4830 
4831   MacroID &ID = MacroIDs[MI];
4832   if (ID == 0) {
4833     ID = NextMacroID++;
4834     MacroInfoToEmitData Info = { Name, MI, ID };
4835     MacroInfosToEmit.push_back(Info);
4836   }
4837   return ID;
4838 }
4839 
getMacroID(MacroInfo * MI)4840 MacroID ASTWriter::getMacroID(MacroInfo *MI) {
4841   if (!MI || MI->isBuiltinMacro())
4842     return 0;
4843 
4844   assert(MacroIDs.find(MI) != MacroIDs.end() && "Macro not emitted!");
4845   return MacroIDs[MI];
4846 }
4847 
getMacroDirectivesOffset(const IdentifierInfo * Name)4848 uint64_t ASTWriter::getMacroDirectivesOffset(const IdentifierInfo *Name) {
4849   return IdentMacroDirectivesOffsetMap.lookup(Name);
4850 }
4851 
AddSelectorRef(const Selector SelRef)4852 void ASTRecordWriter::AddSelectorRef(const Selector SelRef) {
4853   Record->push_back(Writer->getSelectorRef(SelRef));
4854 }
4855 
getSelectorRef(Selector Sel)4856 SelectorID ASTWriter::getSelectorRef(Selector Sel) {
4857   if (Sel.getAsOpaquePtr() == nullptr) {
4858     return 0;
4859   }
4860 
4861   SelectorID SID = SelectorIDs[Sel];
4862   if (SID == 0 && Chain) {
4863     // This might trigger a ReadSelector callback, which will set the ID for
4864     // this selector.
4865     Chain->LoadSelector(Sel);
4866     SID = SelectorIDs[Sel];
4867   }
4868   if (SID == 0) {
4869     SID = NextSelectorID++;
4870     SelectorIDs[Sel] = SID;
4871   }
4872   return SID;
4873 }
4874 
AddCXXTemporary(const CXXTemporary * Temp)4875 void ASTRecordWriter::AddCXXTemporary(const CXXTemporary *Temp) {
4876   AddDeclRef(Temp->getDestructor());
4877 }
4878 
AddTemplateArgumentLocInfo(TemplateArgument::ArgKind Kind,const TemplateArgumentLocInfo & Arg)4879 void ASTRecordWriter::AddTemplateArgumentLocInfo(
4880     TemplateArgument::ArgKind Kind, const TemplateArgumentLocInfo &Arg) {
4881   switch (Kind) {
4882   case TemplateArgument::Expression:
4883     AddStmt(Arg.getAsExpr());
4884     break;
4885   case TemplateArgument::Type:
4886     AddTypeSourceInfo(Arg.getAsTypeSourceInfo());
4887     break;
4888   case TemplateArgument::Template:
4889     AddNestedNameSpecifierLoc(Arg.getTemplateQualifierLoc());
4890     AddSourceLocation(Arg.getTemplateNameLoc());
4891     break;
4892   case TemplateArgument::TemplateExpansion:
4893     AddNestedNameSpecifierLoc(Arg.getTemplateQualifierLoc());
4894     AddSourceLocation(Arg.getTemplateNameLoc());
4895     AddSourceLocation(Arg.getTemplateEllipsisLoc());
4896     break;
4897   case TemplateArgument::Null:
4898   case TemplateArgument::Integral:
4899   case TemplateArgument::Declaration:
4900   case TemplateArgument::NullPtr:
4901   case TemplateArgument::Pack:
4902     // FIXME: Is this right?
4903     break;
4904   }
4905 }
4906 
AddTemplateArgumentLoc(const TemplateArgumentLoc & Arg)4907 void ASTRecordWriter::AddTemplateArgumentLoc(const TemplateArgumentLoc &Arg) {
4908   AddTemplateArgument(Arg.getArgument());
4909 
4910   if (Arg.getArgument().getKind() == TemplateArgument::Expression) {
4911     bool InfoHasSameExpr
4912       = Arg.getArgument().getAsExpr() == Arg.getLocInfo().getAsExpr();
4913     Record->push_back(InfoHasSameExpr);
4914     if (InfoHasSameExpr)
4915       return; // Avoid storing the same expr twice.
4916   }
4917   AddTemplateArgumentLocInfo(Arg.getArgument().getKind(), Arg.getLocInfo());
4918 }
4919 
AddTypeSourceInfo(TypeSourceInfo * TInfo)4920 void ASTRecordWriter::AddTypeSourceInfo(TypeSourceInfo *TInfo) {
4921   if (!TInfo) {
4922     AddTypeRef(QualType());
4923     return;
4924   }
4925 
4926   AddTypeLoc(TInfo->getTypeLoc());
4927 }
4928 
AddTypeLoc(TypeLoc TL)4929 void ASTRecordWriter::AddTypeLoc(TypeLoc TL) {
4930   AddTypeRef(TL.getType());
4931 
4932   TypeLocWriter TLW(*this);
4933   for (; !TL.isNull(); TL = TL.getNextTypeLoc())
4934     TLW.Visit(TL);
4935 }
4936 
AddTypeRef(QualType T,RecordDataImpl & Record)4937 void ASTWriter::AddTypeRef(QualType T, RecordDataImpl &Record) {
4938   Record.push_back(GetOrCreateTypeID(T));
4939 }
4940 
GetOrCreateTypeID(QualType T)4941 TypeID ASTWriter::GetOrCreateTypeID(QualType T) {
4942   assert(Context);
4943   return MakeTypeID(*Context, T, [&](QualType T) -> TypeIdx {
4944     if (T.isNull())
4945       return TypeIdx();
4946     assert(!T.getLocalFastQualifiers());
4947 
4948     TypeIdx &Idx = TypeIdxs[T];
4949     if (Idx.getIndex() == 0) {
4950       if (DoneWritingDeclsAndTypes) {
4951         assert(0 && "New type seen after serializing all the types to emit!");
4952         return TypeIdx();
4953       }
4954 
4955       // We haven't seen this type before. Assign it a new ID and put it
4956       // into the queue of types to emit.
4957       Idx = TypeIdx(NextTypeID++);
4958       DeclTypesToEmit.push(T);
4959     }
4960     return Idx;
4961   });
4962 }
4963 
getTypeID(QualType T) const4964 TypeID ASTWriter::getTypeID(QualType T) const {
4965   assert(Context);
4966   return MakeTypeID(*Context, T, [&](QualType T) -> TypeIdx {
4967     if (T.isNull())
4968       return TypeIdx();
4969     assert(!T.getLocalFastQualifiers());
4970 
4971     TypeIdxMap::const_iterator I = TypeIdxs.find(T);
4972     assert(I != TypeIdxs.end() && "Type not emitted!");
4973     return I->second;
4974   });
4975 }
4976 
AddDeclRef(const Decl * D,RecordDataImpl & Record)4977 void ASTWriter::AddDeclRef(const Decl *D, RecordDataImpl &Record) {
4978   Record.push_back(GetDeclRef(D));
4979 }
4980 
GetDeclRef(const Decl * D)4981 DeclID ASTWriter::GetDeclRef(const Decl *D) {
4982   assert(WritingAST && "Cannot request a declaration ID before AST writing");
4983 
4984   if (!D) {
4985     return 0;
4986   }
4987 
4988   // If D comes from an AST file, its declaration ID is already known and
4989   // fixed.
4990   if (D->isFromASTFile())
4991     return D->getGlobalID();
4992 
4993   assert(!(reinterpret_cast<uintptr_t>(D) & 0x01) && "Invalid decl pointer");
4994   DeclID &ID = DeclIDs[D];
4995   if (ID == 0) {
4996     if (DoneWritingDeclsAndTypes) {
4997       assert(0 && "New decl seen after serializing all the decls to emit!");
4998       return 0;
4999     }
5000 
5001     // We haven't seen this declaration before. Give it a new ID and
5002     // enqueue it in the list of declarations to emit.
5003     ID = NextDeclID++;
5004     DeclTypesToEmit.push(const_cast<Decl *>(D));
5005   }
5006 
5007   return ID;
5008 }
5009 
getDeclID(const Decl * D)5010 DeclID ASTWriter::getDeclID(const Decl *D) {
5011   if (!D)
5012     return 0;
5013 
5014   // If D comes from an AST file, its declaration ID is already known and
5015   // fixed.
5016   if (D->isFromASTFile())
5017     return D->getGlobalID();
5018 
5019   assert(DeclIDs.find(D) != DeclIDs.end() && "Declaration not emitted!");
5020   return DeclIDs[D];
5021 }
5022 
associateDeclWithFile(const Decl * D,DeclID ID)5023 void ASTWriter::associateDeclWithFile(const Decl *D, DeclID ID) {
5024   assert(ID);
5025   assert(D);
5026 
5027   SourceLocation Loc = D->getLocation();
5028   if (Loc.isInvalid())
5029     return;
5030 
5031   // We only keep track of the file-level declarations of each file.
5032   if (!D->getLexicalDeclContext()->isFileContext())
5033     return;
5034   // FIXME: ParmVarDecls that are part of a function type of a parameter of
5035   // a function/objc method, should not have TU as lexical context.
5036   if (isa<ParmVarDecl>(D))
5037     return;
5038 
5039   SourceManager &SM = Context->getSourceManager();
5040   SourceLocation FileLoc = SM.getFileLoc(Loc);
5041   assert(SM.isLocalSourceLocation(FileLoc));
5042   FileID FID;
5043   unsigned Offset;
5044   std::tie(FID, Offset) = SM.getDecomposedLoc(FileLoc);
5045   if (FID.isInvalid())
5046     return;
5047   assert(SM.getSLocEntry(FID).isFile());
5048 
5049   DeclIDInFileInfo *&Info = FileDeclIDs[FID];
5050   if (!Info)
5051     Info = new DeclIDInFileInfo();
5052 
5053   std::pair<unsigned, serialization::DeclID> LocDecl(Offset, ID);
5054   LocDeclIDsTy &Decls = Info->DeclIDs;
5055 
5056   if (Decls.empty() || Decls.back().first <= Offset) {
5057     Decls.push_back(LocDecl);
5058     return;
5059   }
5060 
5061   LocDeclIDsTy::iterator I =
5062       std::upper_bound(Decls.begin(), Decls.end(), LocDecl, llvm::less_first());
5063 
5064   Decls.insert(I, LocDecl);
5065 }
5066 
AddDeclarationName(DeclarationName Name)5067 void ASTRecordWriter::AddDeclarationName(DeclarationName Name) {
5068   // FIXME: Emit a stable enum for NameKind.  0 = Identifier etc.
5069   Record->push_back(Name.getNameKind());
5070   switch (Name.getNameKind()) {
5071   case DeclarationName::Identifier:
5072     AddIdentifierRef(Name.getAsIdentifierInfo());
5073     break;
5074 
5075   case DeclarationName::ObjCZeroArgSelector:
5076   case DeclarationName::ObjCOneArgSelector:
5077   case DeclarationName::ObjCMultiArgSelector:
5078     AddSelectorRef(Name.getObjCSelector());
5079     break;
5080 
5081   case DeclarationName::CXXConstructorName:
5082   case DeclarationName::CXXDestructorName:
5083   case DeclarationName::CXXConversionFunctionName:
5084     AddTypeRef(Name.getCXXNameType());
5085     break;
5086 
5087   case DeclarationName::CXXOperatorName:
5088     Record->push_back(Name.getCXXOverloadedOperator());
5089     break;
5090 
5091   case DeclarationName::CXXLiteralOperatorName:
5092     AddIdentifierRef(Name.getCXXLiteralIdentifier());
5093     break;
5094 
5095   case DeclarationName::CXXUsingDirective:
5096     // No extra data to emit
5097     break;
5098   }
5099 }
5100 
getAnonymousDeclarationNumber(const NamedDecl * D)5101 unsigned ASTWriter::getAnonymousDeclarationNumber(const NamedDecl *D) {
5102   assert(needsAnonymousDeclarationNumber(D) &&
5103          "expected an anonymous declaration");
5104 
5105   // Number the anonymous declarations within this context, if we've not
5106   // already done so.
5107   auto It = AnonymousDeclarationNumbers.find(D);
5108   if (It == AnonymousDeclarationNumbers.end()) {
5109     auto *DC = D->getLexicalDeclContext();
5110     numberAnonymousDeclsWithin(DC, [&](const NamedDecl *ND, unsigned Number) {
5111       AnonymousDeclarationNumbers[ND] = Number;
5112     });
5113 
5114     It = AnonymousDeclarationNumbers.find(D);
5115     assert(It != AnonymousDeclarationNumbers.end() &&
5116            "declaration not found within its lexical context");
5117   }
5118 
5119   return It->second;
5120 }
5121 
AddDeclarationNameLoc(const DeclarationNameLoc & DNLoc,DeclarationName Name)5122 void ASTRecordWriter::AddDeclarationNameLoc(const DeclarationNameLoc &DNLoc,
5123                                             DeclarationName Name) {
5124   switch (Name.getNameKind()) {
5125   case DeclarationName::CXXConstructorName:
5126   case DeclarationName::CXXDestructorName:
5127   case DeclarationName::CXXConversionFunctionName:
5128     AddTypeSourceInfo(DNLoc.NamedType.TInfo);
5129     break;
5130 
5131   case DeclarationName::CXXOperatorName:
5132     AddSourceLocation(SourceLocation::getFromRawEncoding(
5133         DNLoc.CXXOperatorName.BeginOpNameLoc));
5134     AddSourceLocation(
5135         SourceLocation::getFromRawEncoding(DNLoc.CXXOperatorName.EndOpNameLoc));
5136     break;
5137 
5138   case DeclarationName::CXXLiteralOperatorName:
5139     AddSourceLocation(SourceLocation::getFromRawEncoding(
5140         DNLoc.CXXLiteralOperatorName.OpNameLoc));
5141     break;
5142 
5143   case DeclarationName::Identifier:
5144   case DeclarationName::ObjCZeroArgSelector:
5145   case DeclarationName::ObjCOneArgSelector:
5146   case DeclarationName::ObjCMultiArgSelector:
5147   case DeclarationName::CXXUsingDirective:
5148     break;
5149   }
5150 }
5151 
AddDeclarationNameInfo(const DeclarationNameInfo & NameInfo)5152 void ASTRecordWriter::AddDeclarationNameInfo(
5153     const DeclarationNameInfo &NameInfo) {
5154   AddDeclarationName(NameInfo.getName());
5155   AddSourceLocation(NameInfo.getLoc());
5156   AddDeclarationNameLoc(NameInfo.getInfo(), NameInfo.getName());
5157 }
5158 
AddQualifierInfo(const QualifierInfo & Info)5159 void ASTRecordWriter::AddQualifierInfo(const QualifierInfo &Info) {
5160   AddNestedNameSpecifierLoc(Info.QualifierLoc);
5161   Record->push_back(Info.NumTemplParamLists);
5162   for (unsigned i=0, e=Info.NumTemplParamLists; i != e; ++i)
5163     AddTemplateParameterList(Info.TemplParamLists[i]);
5164 }
5165 
AddNestedNameSpecifier(NestedNameSpecifier * NNS)5166 void ASTRecordWriter::AddNestedNameSpecifier(NestedNameSpecifier *NNS) {
5167   // Nested name specifiers usually aren't too long. I think that 8 would
5168   // typically accommodate the vast majority.
5169   SmallVector<NestedNameSpecifier *, 8> NestedNames;
5170 
5171   // Push each of the NNS's onto a stack for serialization in reverse order.
5172   while (NNS) {
5173     NestedNames.push_back(NNS);
5174     NNS = NNS->getPrefix();
5175   }
5176 
5177   Record->push_back(NestedNames.size());
5178   while(!NestedNames.empty()) {
5179     NNS = NestedNames.pop_back_val();
5180     NestedNameSpecifier::SpecifierKind Kind = NNS->getKind();
5181     Record->push_back(Kind);
5182     switch (Kind) {
5183     case NestedNameSpecifier::Identifier:
5184       AddIdentifierRef(NNS->getAsIdentifier());
5185       break;
5186 
5187     case NestedNameSpecifier::Namespace:
5188       AddDeclRef(NNS->getAsNamespace());
5189       break;
5190 
5191     case NestedNameSpecifier::NamespaceAlias:
5192       AddDeclRef(NNS->getAsNamespaceAlias());
5193       break;
5194 
5195     case NestedNameSpecifier::TypeSpec:
5196     case NestedNameSpecifier::TypeSpecWithTemplate:
5197       AddTypeRef(QualType(NNS->getAsType(), 0));
5198       Record->push_back(Kind == NestedNameSpecifier::TypeSpecWithTemplate);
5199       break;
5200 
5201     case NestedNameSpecifier::Global:
5202       // Don't need to write an associated value.
5203       break;
5204 
5205     case NestedNameSpecifier::Super:
5206       AddDeclRef(NNS->getAsRecordDecl());
5207       break;
5208     }
5209   }
5210 }
5211 
AddNestedNameSpecifierLoc(NestedNameSpecifierLoc NNS)5212 void ASTRecordWriter::AddNestedNameSpecifierLoc(NestedNameSpecifierLoc NNS) {
5213   // Nested name specifiers usually aren't too long. I think that 8 would
5214   // typically accommodate the vast majority.
5215   SmallVector<NestedNameSpecifierLoc , 8> NestedNames;
5216 
5217   // Push each of the nested-name-specifiers's onto a stack for
5218   // serialization in reverse order.
5219   while (NNS) {
5220     NestedNames.push_back(NNS);
5221     NNS = NNS.getPrefix();
5222   }
5223 
5224   Record->push_back(NestedNames.size());
5225   while(!NestedNames.empty()) {
5226     NNS = NestedNames.pop_back_val();
5227     NestedNameSpecifier::SpecifierKind Kind
5228       = NNS.getNestedNameSpecifier()->getKind();
5229     Record->push_back(Kind);
5230     switch (Kind) {
5231     case NestedNameSpecifier::Identifier:
5232       AddIdentifierRef(NNS.getNestedNameSpecifier()->getAsIdentifier());
5233       AddSourceRange(NNS.getLocalSourceRange());
5234       break;
5235 
5236     case NestedNameSpecifier::Namespace:
5237       AddDeclRef(NNS.getNestedNameSpecifier()->getAsNamespace());
5238       AddSourceRange(NNS.getLocalSourceRange());
5239       break;
5240 
5241     case NestedNameSpecifier::NamespaceAlias:
5242       AddDeclRef(NNS.getNestedNameSpecifier()->getAsNamespaceAlias());
5243       AddSourceRange(NNS.getLocalSourceRange());
5244       break;
5245 
5246     case NestedNameSpecifier::TypeSpec:
5247     case NestedNameSpecifier::TypeSpecWithTemplate:
5248       Record->push_back(Kind == NestedNameSpecifier::TypeSpecWithTemplate);
5249       AddTypeLoc(NNS.getTypeLoc());
5250       AddSourceLocation(NNS.getLocalSourceRange().getEnd());
5251       break;
5252 
5253     case NestedNameSpecifier::Global:
5254       AddSourceLocation(NNS.getLocalSourceRange().getEnd());
5255       break;
5256 
5257     case NestedNameSpecifier::Super:
5258       AddDeclRef(NNS.getNestedNameSpecifier()->getAsRecordDecl());
5259       AddSourceRange(NNS.getLocalSourceRange());
5260       break;
5261     }
5262   }
5263 }
5264 
AddTemplateName(TemplateName Name)5265 void ASTRecordWriter::AddTemplateName(TemplateName Name) {
5266   TemplateName::NameKind Kind = Name.getKind();
5267   Record->push_back(Kind);
5268   switch (Kind) {
5269   case TemplateName::Template:
5270     AddDeclRef(Name.getAsTemplateDecl());
5271     break;
5272 
5273   case TemplateName::OverloadedTemplate: {
5274     OverloadedTemplateStorage *OvT = Name.getAsOverloadedTemplate();
5275     Record->push_back(OvT->size());
5276     for (const auto &I : *OvT)
5277       AddDeclRef(I);
5278     break;
5279   }
5280 
5281   case TemplateName::QualifiedTemplate: {
5282     QualifiedTemplateName *QualT = Name.getAsQualifiedTemplateName();
5283     AddNestedNameSpecifier(QualT->getQualifier());
5284     Record->push_back(QualT->hasTemplateKeyword());
5285     AddDeclRef(QualT->getTemplateDecl());
5286     break;
5287   }
5288 
5289   case TemplateName::DependentTemplate: {
5290     DependentTemplateName *DepT = Name.getAsDependentTemplateName();
5291     AddNestedNameSpecifier(DepT->getQualifier());
5292     Record->push_back(DepT->isIdentifier());
5293     if (DepT->isIdentifier())
5294       AddIdentifierRef(DepT->getIdentifier());
5295     else
5296       Record->push_back(DepT->getOperator());
5297     break;
5298   }
5299 
5300   case TemplateName::SubstTemplateTemplateParm: {
5301     SubstTemplateTemplateParmStorage *subst
5302       = Name.getAsSubstTemplateTemplateParm();
5303     AddDeclRef(subst->getParameter());
5304     AddTemplateName(subst->getReplacement());
5305     break;
5306   }
5307 
5308   case TemplateName::SubstTemplateTemplateParmPack: {
5309     SubstTemplateTemplateParmPackStorage *SubstPack
5310       = Name.getAsSubstTemplateTemplateParmPack();
5311     AddDeclRef(SubstPack->getParameterPack());
5312     AddTemplateArgument(SubstPack->getArgumentPack());
5313     break;
5314   }
5315   }
5316 }
5317 
AddTemplateArgument(const TemplateArgument & Arg)5318 void ASTRecordWriter::AddTemplateArgument(const TemplateArgument &Arg) {
5319   Record->push_back(Arg.getKind());
5320   switch (Arg.getKind()) {
5321   case TemplateArgument::Null:
5322     break;
5323   case TemplateArgument::Type:
5324     AddTypeRef(Arg.getAsType());
5325     break;
5326   case TemplateArgument::Declaration:
5327     AddDeclRef(Arg.getAsDecl());
5328     AddTypeRef(Arg.getParamTypeForDecl());
5329     break;
5330   case TemplateArgument::NullPtr:
5331     AddTypeRef(Arg.getNullPtrType());
5332     break;
5333   case TemplateArgument::Integral:
5334     AddAPSInt(Arg.getAsIntegral());
5335     AddTypeRef(Arg.getIntegralType());
5336     break;
5337   case TemplateArgument::Template:
5338     AddTemplateName(Arg.getAsTemplateOrTemplatePattern());
5339     break;
5340   case TemplateArgument::TemplateExpansion:
5341     AddTemplateName(Arg.getAsTemplateOrTemplatePattern());
5342     if (Optional<unsigned> NumExpansions = Arg.getNumTemplateExpansions())
5343       Record->push_back(*NumExpansions + 1);
5344     else
5345       Record->push_back(0);
5346     break;
5347   case TemplateArgument::Expression:
5348     AddStmt(Arg.getAsExpr());
5349     break;
5350   case TemplateArgument::Pack:
5351     Record->push_back(Arg.pack_size());
5352     for (const auto &P : Arg.pack_elements())
5353       AddTemplateArgument(P);
5354     break;
5355   }
5356 }
5357 
AddTemplateParameterList(const TemplateParameterList * TemplateParams)5358 void ASTRecordWriter::AddTemplateParameterList(
5359     const TemplateParameterList *TemplateParams) {
5360   assert(TemplateParams && "No TemplateParams!");
5361   AddSourceLocation(TemplateParams->getTemplateLoc());
5362   AddSourceLocation(TemplateParams->getLAngleLoc());
5363   AddSourceLocation(TemplateParams->getRAngleLoc());
5364   Record->push_back(TemplateParams->size());
5365   for (const auto &P : *TemplateParams)
5366     AddDeclRef(P);
5367 }
5368 
5369 /// \brief Emit a template argument list.
AddTemplateArgumentList(const TemplateArgumentList * TemplateArgs)5370 void ASTRecordWriter::AddTemplateArgumentList(
5371     const TemplateArgumentList *TemplateArgs) {
5372   assert(TemplateArgs && "No TemplateArgs!");
5373   Record->push_back(TemplateArgs->size());
5374   for (int i=0, e = TemplateArgs->size(); i != e; ++i)
5375     AddTemplateArgument(TemplateArgs->get(i));
5376 }
5377 
AddASTTemplateArgumentListInfo(const ASTTemplateArgumentListInfo * ASTTemplArgList)5378 void ASTRecordWriter::AddASTTemplateArgumentListInfo(
5379     const ASTTemplateArgumentListInfo *ASTTemplArgList) {
5380   assert(ASTTemplArgList && "No ASTTemplArgList!");
5381   AddSourceLocation(ASTTemplArgList->LAngleLoc);
5382   AddSourceLocation(ASTTemplArgList->RAngleLoc);
5383   Record->push_back(ASTTemplArgList->NumTemplateArgs);
5384   const TemplateArgumentLoc *TemplArgs = ASTTemplArgList->getTemplateArgs();
5385   for (int i=0, e = ASTTemplArgList->NumTemplateArgs; i != e; ++i)
5386     AddTemplateArgumentLoc(TemplArgs[i]);
5387 }
5388 
AddUnresolvedSet(const ASTUnresolvedSet & Set)5389 void ASTRecordWriter::AddUnresolvedSet(const ASTUnresolvedSet &Set) {
5390   Record->push_back(Set.size());
5391   for (ASTUnresolvedSet::const_iterator
5392          I = Set.begin(), E = Set.end(); I != E; ++I) {
5393     AddDeclRef(I.getDecl());
5394     Record->push_back(I.getAccess());
5395   }
5396 }
5397 
5398 // FIXME: Move this out of the main ASTRecordWriter interface.
AddCXXBaseSpecifier(const CXXBaseSpecifier & Base)5399 void ASTRecordWriter::AddCXXBaseSpecifier(const CXXBaseSpecifier &Base) {
5400   Record->push_back(Base.isVirtual());
5401   Record->push_back(Base.isBaseOfClass());
5402   Record->push_back(Base.getAccessSpecifierAsWritten());
5403   Record->push_back(Base.getInheritConstructors());
5404   AddTypeSourceInfo(Base.getTypeSourceInfo());
5405   AddSourceRange(Base.getSourceRange());
5406   AddSourceLocation(Base.isPackExpansion()? Base.getEllipsisLoc()
5407                                           : SourceLocation());
5408 }
5409 
EmitCXXBaseSpecifiers(ASTWriter & W,ArrayRef<CXXBaseSpecifier> Bases)5410 static uint64_t EmitCXXBaseSpecifiers(ASTWriter &W,
5411                                       ArrayRef<CXXBaseSpecifier> Bases) {
5412   ASTWriter::RecordData Record;
5413   ASTRecordWriter Writer(W, Record);
5414   Writer.push_back(Bases.size());
5415 
5416   for (auto &Base : Bases)
5417     Writer.AddCXXBaseSpecifier(Base);
5418 
5419   return Writer.Emit(serialization::DECL_CXX_BASE_SPECIFIERS);
5420 }
5421 
5422 // FIXME: Move this out of the main ASTRecordWriter interface.
AddCXXBaseSpecifiers(ArrayRef<CXXBaseSpecifier> Bases)5423 void ASTRecordWriter::AddCXXBaseSpecifiers(ArrayRef<CXXBaseSpecifier> Bases) {
5424   AddOffset(EmitCXXBaseSpecifiers(*Writer, Bases));
5425 }
5426 
5427 static uint64_t
EmitCXXCtorInitializers(ASTWriter & W,ArrayRef<CXXCtorInitializer * > CtorInits)5428 EmitCXXCtorInitializers(ASTWriter &W,
5429                         ArrayRef<CXXCtorInitializer *> CtorInits) {
5430   ASTWriter::RecordData Record;
5431   ASTRecordWriter Writer(W, Record);
5432   Writer.push_back(CtorInits.size());
5433 
5434   for (auto *Init : CtorInits) {
5435     if (Init->isBaseInitializer()) {
5436       Writer.push_back(CTOR_INITIALIZER_BASE);
5437       Writer.AddTypeSourceInfo(Init->getTypeSourceInfo());
5438       Writer.push_back(Init->isBaseVirtual());
5439     } else if (Init->isDelegatingInitializer()) {
5440       Writer.push_back(CTOR_INITIALIZER_DELEGATING);
5441       Writer.AddTypeSourceInfo(Init->getTypeSourceInfo());
5442     } else if (Init->isMemberInitializer()){
5443       Writer.push_back(CTOR_INITIALIZER_MEMBER);
5444       Writer.AddDeclRef(Init->getMember());
5445     } else {
5446       Writer.push_back(CTOR_INITIALIZER_INDIRECT_MEMBER);
5447       Writer.AddDeclRef(Init->getIndirectMember());
5448     }
5449 
5450     Writer.AddSourceLocation(Init->getMemberLocation());
5451     Writer.AddStmt(Init->getInit());
5452     Writer.AddSourceLocation(Init->getLParenLoc());
5453     Writer.AddSourceLocation(Init->getRParenLoc());
5454     Writer.push_back(Init->isWritten());
5455     if (Init->isWritten()) {
5456       Writer.push_back(Init->getSourceOrder());
5457     } else {
5458       Writer.push_back(Init->getNumArrayIndices());
5459       for (auto *VD : Init->getArrayIndices())
5460         Writer.AddDeclRef(VD);
5461     }
5462   }
5463 
5464   return Writer.Emit(serialization::DECL_CXX_CTOR_INITIALIZERS);
5465 }
5466 
5467 // FIXME: Move this out of the main ASTRecordWriter interface.
AddCXXCtorInitializers(ArrayRef<CXXCtorInitializer * > CtorInits)5468 void ASTRecordWriter::AddCXXCtorInitializers(
5469     ArrayRef<CXXCtorInitializer *> CtorInits) {
5470   AddOffset(EmitCXXCtorInitializers(*Writer, CtorInits));
5471 }
5472 
AddCXXDefinitionData(const CXXRecordDecl * D)5473 void ASTRecordWriter::AddCXXDefinitionData(const CXXRecordDecl *D) {
5474   auto &Data = D->data();
5475   Record->push_back(Data.IsLambda);
5476   Record->push_back(Data.UserDeclaredConstructor);
5477   Record->push_back(Data.UserDeclaredSpecialMembers);
5478   Record->push_back(Data.Aggregate);
5479   Record->push_back(Data.PlainOldData);
5480   Record->push_back(Data.Empty);
5481   Record->push_back(Data.Polymorphic);
5482   Record->push_back(Data.Abstract);
5483   Record->push_back(Data.IsStandardLayout);
5484   Record->push_back(Data.HasNoNonEmptyBases);
5485   Record->push_back(Data.HasPrivateFields);
5486   Record->push_back(Data.HasProtectedFields);
5487   Record->push_back(Data.HasPublicFields);
5488   Record->push_back(Data.HasMutableFields);
5489   Record->push_back(Data.HasVariantMembers);
5490   Record->push_back(Data.HasOnlyCMembers);
5491   Record->push_back(Data.HasInClassInitializer);
5492   Record->push_back(Data.HasUninitializedReferenceMember);
5493   Record->push_back(Data.HasUninitializedFields);
5494   Record->push_back(Data.HasInheritedConstructor);
5495   Record->push_back(Data.HasInheritedAssignment);
5496   Record->push_back(Data.NeedOverloadResolutionForMoveConstructor);
5497   Record->push_back(Data.NeedOverloadResolutionForMoveAssignment);
5498   Record->push_back(Data.NeedOverloadResolutionForDestructor);
5499   Record->push_back(Data.DefaultedMoveConstructorIsDeleted);
5500   Record->push_back(Data.DefaultedMoveAssignmentIsDeleted);
5501   Record->push_back(Data.DefaultedDestructorIsDeleted);
5502   Record->push_back(Data.HasTrivialSpecialMembers);
5503   Record->push_back(Data.DeclaredNonTrivialSpecialMembers);
5504   Record->push_back(Data.HasIrrelevantDestructor);
5505   Record->push_back(Data.HasConstexprNonCopyMoveConstructor);
5506   Record->push_back(Data.HasDefaultedDefaultConstructor);
5507   Record->push_back(Data.DefaultedDefaultConstructorIsConstexpr);
5508   Record->push_back(Data.HasConstexprDefaultConstructor);
5509   Record->push_back(Data.HasNonLiteralTypeFieldsOrBases);
5510   Record->push_back(Data.ComputedVisibleConversions);
5511   Record->push_back(Data.UserProvidedDefaultConstructor);
5512   Record->push_back(Data.DeclaredSpecialMembers);
5513   Record->push_back(Data.ImplicitCopyConstructorHasConstParam);
5514   Record->push_back(Data.ImplicitCopyAssignmentHasConstParam);
5515   Record->push_back(Data.HasDeclaredCopyConstructorWithConstParam);
5516   Record->push_back(Data.HasDeclaredCopyAssignmentWithConstParam);
5517   // IsLambda bit is already saved.
5518 
5519   Record->push_back(Data.NumBases);
5520   if (Data.NumBases > 0)
5521     AddCXXBaseSpecifiers(Data.bases());
5522 
5523   // FIXME: Make VBases lazily computed when needed to avoid storing them.
5524   Record->push_back(Data.NumVBases);
5525   if (Data.NumVBases > 0)
5526     AddCXXBaseSpecifiers(Data.vbases());
5527 
5528   AddUnresolvedSet(Data.Conversions.get(*Writer->Context));
5529   AddUnresolvedSet(Data.VisibleConversions.get(*Writer->Context));
5530   // Data.Definition is the owning decl, no need to write it.
5531   AddDeclRef(D->getFirstFriend());
5532 
5533   // Add lambda-specific data.
5534   if (Data.IsLambda) {
5535     auto &Lambda = D->getLambdaData();
5536     Record->push_back(Lambda.Dependent);
5537     Record->push_back(Lambda.IsGenericLambda);
5538     Record->push_back(Lambda.CaptureDefault);
5539     Record->push_back(Lambda.NumCaptures);
5540     Record->push_back(Lambda.NumExplicitCaptures);
5541     Record->push_back(Lambda.ManglingNumber);
5542     AddDeclRef(Lambda.ContextDecl);
5543     AddTypeSourceInfo(Lambda.MethodTyInfo);
5544     for (unsigned I = 0, N = Lambda.NumCaptures; I != N; ++I) {
5545       const LambdaCapture &Capture = Lambda.Captures[I];
5546       AddSourceLocation(Capture.getLocation());
5547       Record->push_back(Capture.isImplicit());
5548       Record->push_back(Capture.getCaptureKind());
5549       switch (Capture.getCaptureKind()) {
5550       case LCK_StarThis:
5551       case LCK_This:
5552       case LCK_VLAType:
5553         break;
5554       case LCK_ByCopy:
5555       case LCK_ByRef:
5556         VarDecl *Var =
5557             Capture.capturesVariable() ? Capture.getCapturedVar() : nullptr;
5558         AddDeclRef(Var);
5559         AddSourceLocation(Capture.isPackExpansion() ? Capture.getEllipsisLoc()
5560                                                     : SourceLocation());
5561         break;
5562       }
5563     }
5564   }
5565 }
5566 
ReaderInitialized(ASTReader * Reader)5567 void ASTWriter::ReaderInitialized(ASTReader *Reader) {
5568   assert(Reader && "Cannot remove chain");
5569   assert((!Chain || Chain == Reader) && "Cannot replace chain");
5570   assert(FirstDeclID == NextDeclID &&
5571          FirstTypeID == NextTypeID &&
5572          FirstIdentID == NextIdentID &&
5573          FirstMacroID == NextMacroID &&
5574          FirstSubmoduleID == NextSubmoduleID &&
5575          FirstSelectorID == NextSelectorID &&
5576          "Setting chain after writing has started.");
5577 
5578   Chain = Reader;
5579 
5580   // Note, this will get called multiple times, once one the reader starts up
5581   // and again each time it's done reading a PCH or module.
5582   FirstDeclID = NUM_PREDEF_DECL_IDS + Chain->getTotalNumDecls();
5583   FirstTypeID = NUM_PREDEF_TYPE_IDS + Chain->getTotalNumTypes();
5584   FirstIdentID = NUM_PREDEF_IDENT_IDS + Chain->getTotalNumIdentifiers();
5585   FirstMacroID = NUM_PREDEF_MACRO_IDS + Chain->getTotalNumMacros();
5586   FirstSubmoduleID = NUM_PREDEF_SUBMODULE_IDS + Chain->getTotalNumSubmodules();
5587   FirstSelectorID = NUM_PREDEF_SELECTOR_IDS + Chain->getTotalNumSelectors();
5588   NextDeclID = FirstDeclID;
5589   NextTypeID = FirstTypeID;
5590   NextIdentID = FirstIdentID;
5591   NextMacroID = FirstMacroID;
5592   NextSelectorID = FirstSelectorID;
5593   NextSubmoduleID = FirstSubmoduleID;
5594 }
5595 
IdentifierRead(IdentID ID,IdentifierInfo * II)5596 void ASTWriter::IdentifierRead(IdentID ID, IdentifierInfo *II) {
5597   // Always keep the highest ID. See \p TypeRead() for more information.
5598   IdentID &StoredID = IdentifierIDs[II];
5599   if (ID > StoredID)
5600     StoredID = ID;
5601 }
5602 
MacroRead(serialization::MacroID ID,MacroInfo * MI)5603 void ASTWriter::MacroRead(serialization::MacroID ID, MacroInfo *MI) {
5604   // Always keep the highest ID. See \p TypeRead() for more information.
5605   MacroID &StoredID = MacroIDs[MI];
5606   if (ID > StoredID)
5607     StoredID = ID;
5608 }
5609 
TypeRead(TypeIdx Idx,QualType T)5610 void ASTWriter::TypeRead(TypeIdx Idx, QualType T) {
5611   // Always take the highest-numbered type index. This copes with an interesting
5612   // case for chained AST writing where we schedule writing the type and then,
5613   // later, deserialize the type from another AST. In this case, we want to
5614   // keep the higher-numbered entry so that we can properly write it out to
5615   // the AST file.
5616   TypeIdx &StoredIdx = TypeIdxs[T];
5617   if (Idx.getIndex() >= StoredIdx.getIndex())
5618     StoredIdx = Idx;
5619 }
5620 
SelectorRead(SelectorID ID,Selector S)5621 void ASTWriter::SelectorRead(SelectorID ID, Selector S) {
5622   // Always keep the highest ID. See \p TypeRead() for more information.
5623   SelectorID &StoredID = SelectorIDs[S];
5624   if (ID > StoredID)
5625     StoredID = ID;
5626 }
5627 
MacroDefinitionRead(serialization::PreprocessedEntityID ID,MacroDefinitionRecord * MD)5628 void ASTWriter::MacroDefinitionRead(serialization::PreprocessedEntityID ID,
5629                                     MacroDefinitionRecord *MD) {
5630   assert(MacroDefinitions.find(MD) == MacroDefinitions.end());
5631   MacroDefinitions[MD] = ID;
5632 }
5633 
ModuleRead(serialization::SubmoduleID ID,Module * Mod)5634 void ASTWriter::ModuleRead(serialization::SubmoduleID ID, Module *Mod) {
5635   assert(SubmoduleIDs.find(Mod) == SubmoduleIDs.end());
5636   SubmoduleIDs[Mod] = ID;
5637 }
5638 
CompletedTagDefinition(const TagDecl * D)5639 void ASTWriter::CompletedTagDefinition(const TagDecl *D) {
5640   assert(D->isCompleteDefinition());
5641   assert(!WritingAST && "Already writing the AST!");
5642   if (auto *RD = dyn_cast<CXXRecordDecl>(D)) {
5643     // We are interested when a PCH decl is modified.
5644     if (RD->isFromASTFile()) {
5645       // A forward reference was mutated into a definition. Rewrite it.
5646       // FIXME: This happens during template instantiation, should we
5647       // have created a new definition decl instead ?
5648       assert(isTemplateInstantiation(RD->getTemplateSpecializationKind()) &&
5649              "completed a tag from another module but not by instantiation?");
5650       DeclUpdates[RD].push_back(
5651           DeclUpdate(UPD_CXX_INSTANTIATED_CLASS_DEFINITION));
5652     }
5653   }
5654 }
5655 
isImportedDeclContext(ASTReader * Chain,const Decl * D)5656 static bool isImportedDeclContext(ASTReader *Chain, const Decl *D) {
5657   if (D->isFromASTFile())
5658     return true;
5659 
5660   // The predefined __va_list_tag struct is imported if we imported any decls.
5661   // FIXME: This is a gross hack.
5662   return D == D->getASTContext().getVaListTagDecl();
5663 }
5664 
AddedVisibleDecl(const DeclContext * DC,const Decl * D)5665 void ASTWriter::AddedVisibleDecl(const DeclContext *DC, const Decl *D) {
5666    assert(DC->isLookupContext() &&
5667           "Should not add lookup results to non-lookup contexts!");
5668 
5669   // TU is handled elsewhere.
5670   if (isa<TranslationUnitDecl>(DC))
5671     return;
5672 
5673   // Namespaces are handled elsewhere, except for template instantiations of
5674   // FunctionTemplateDecls in namespaces. We are interested in cases where the
5675   // local instantiations are added to an imported context. Only happens when
5676   // adding ADL lookup candidates, for example templated friends.
5677   if (isa<NamespaceDecl>(DC) && D->getFriendObjectKind() == Decl::FOK_None &&
5678       !isa<FunctionTemplateDecl>(D))
5679     return;
5680 
5681   // We're only interested in cases where a local declaration is added to an
5682   // imported context.
5683   if (D->isFromASTFile() || !isImportedDeclContext(Chain, cast<Decl>(DC)))
5684     return;
5685 
5686   assert(DC == DC->getPrimaryContext() && "added to non-primary context");
5687   assert(!getDefinitiveDeclContext(DC) && "DeclContext not definitive!");
5688   assert(!WritingAST && "Already writing the AST!");
5689   if (UpdatedDeclContexts.insert(DC) && !cast<Decl>(DC)->isFromASTFile()) {
5690     // We're adding a visible declaration to a predefined decl context. Ensure
5691     // that we write out all of its lookup results so we don't get a nasty
5692     // surprise when we try to emit its lookup table.
5693     for (auto *Child : DC->decls())
5694       UpdatingVisibleDecls.push_back(Child);
5695   }
5696   UpdatingVisibleDecls.push_back(D);
5697 }
5698 
AddedCXXImplicitMember(const CXXRecordDecl * RD,const Decl * D)5699 void ASTWriter::AddedCXXImplicitMember(const CXXRecordDecl *RD, const Decl *D) {
5700   assert(D->isImplicit());
5701 
5702   // We're only interested in cases where a local declaration is added to an
5703   // imported context.
5704   if (D->isFromASTFile() || !isImportedDeclContext(Chain, RD))
5705     return;
5706 
5707   if (!isa<CXXMethodDecl>(D))
5708     return;
5709 
5710   // A decl coming from PCH was modified.
5711   assert(RD->isCompleteDefinition());
5712   assert(!WritingAST && "Already writing the AST!");
5713   DeclUpdates[RD].push_back(DeclUpdate(UPD_CXX_ADDED_IMPLICIT_MEMBER, D));
5714 }
5715 
ResolvedExceptionSpec(const FunctionDecl * FD)5716 void ASTWriter::ResolvedExceptionSpec(const FunctionDecl *FD) {
5717   assert(!DoneWritingDeclsAndTypes && "Already done writing updates!");
5718   if (!Chain) return;
5719   Chain->forEachImportedKeyDecl(FD, [&](const Decl *D) {
5720     // If we don't already know the exception specification for this redecl
5721     // chain, add an update record for it.
5722     if (isUnresolvedExceptionSpec(cast<FunctionDecl>(D)
5723                                       ->getType()
5724                                       ->castAs<FunctionProtoType>()
5725                                       ->getExceptionSpecType()))
5726       DeclUpdates[D].push_back(UPD_CXX_RESOLVED_EXCEPTION_SPEC);
5727   });
5728 }
5729 
DeducedReturnType(const FunctionDecl * FD,QualType ReturnType)5730 void ASTWriter::DeducedReturnType(const FunctionDecl *FD, QualType ReturnType) {
5731   assert(!WritingAST && "Already writing the AST!");
5732   if (!Chain) return;
5733   Chain->forEachImportedKeyDecl(FD, [&](const Decl *D) {
5734     DeclUpdates[D].push_back(
5735         DeclUpdate(UPD_CXX_DEDUCED_RETURN_TYPE, ReturnType));
5736   });
5737 }
5738 
ResolvedOperatorDelete(const CXXDestructorDecl * DD,const FunctionDecl * Delete)5739 void ASTWriter::ResolvedOperatorDelete(const CXXDestructorDecl *DD,
5740                                        const FunctionDecl *Delete) {
5741   assert(!WritingAST && "Already writing the AST!");
5742   assert(Delete && "Not given an operator delete");
5743   if (!Chain) return;
5744   Chain->forEachImportedKeyDecl(DD, [&](const Decl *D) {
5745     DeclUpdates[D].push_back(DeclUpdate(UPD_CXX_RESOLVED_DTOR_DELETE, Delete));
5746   });
5747 }
5748 
CompletedImplicitDefinition(const FunctionDecl * D)5749 void ASTWriter::CompletedImplicitDefinition(const FunctionDecl *D) {
5750   assert(!WritingAST && "Already writing the AST!");
5751   if (!D->isFromASTFile())
5752     return; // Declaration not imported from PCH.
5753 
5754   // Implicit function decl from a PCH was defined.
5755   DeclUpdates[D].push_back(DeclUpdate(UPD_CXX_ADDED_FUNCTION_DEFINITION));
5756 }
5757 
FunctionDefinitionInstantiated(const FunctionDecl * D)5758 void ASTWriter::FunctionDefinitionInstantiated(const FunctionDecl *D) {
5759   assert(!WritingAST && "Already writing the AST!");
5760   if (!D->isFromASTFile())
5761     return;
5762 
5763   DeclUpdates[D].push_back(DeclUpdate(UPD_CXX_ADDED_FUNCTION_DEFINITION));
5764 }
5765 
StaticDataMemberInstantiated(const VarDecl * D)5766 void ASTWriter::StaticDataMemberInstantiated(const VarDecl *D) {
5767   assert(!WritingAST && "Already writing the AST!");
5768   if (!D->isFromASTFile())
5769     return;
5770 
5771   // Since the actual instantiation is delayed, this really means that we need
5772   // to update the instantiation location.
5773   DeclUpdates[D].push_back(
5774       DeclUpdate(UPD_CXX_INSTANTIATED_STATIC_DATA_MEMBER,
5775        D->getMemberSpecializationInfo()->getPointOfInstantiation()));
5776 }
5777 
DefaultArgumentInstantiated(const ParmVarDecl * D)5778 void ASTWriter::DefaultArgumentInstantiated(const ParmVarDecl *D) {
5779   assert(!WritingAST && "Already writing the AST!");
5780   if (!D->isFromASTFile())
5781     return;
5782 
5783   DeclUpdates[D].push_back(
5784       DeclUpdate(UPD_CXX_INSTANTIATED_DEFAULT_ARGUMENT, D));
5785 }
5786 
AddedObjCCategoryToInterface(const ObjCCategoryDecl * CatD,const ObjCInterfaceDecl * IFD)5787 void ASTWriter::AddedObjCCategoryToInterface(const ObjCCategoryDecl *CatD,
5788                                              const ObjCInterfaceDecl *IFD) {
5789   assert(!WritingAST && "Already writing the AST!");
5790   if (!IFD->isFromASTFile())
5791     return; // Declaration not imported from PCH.
5792 
5793   assert(IFD->getDefinition() && "Category on a class without a definition?");
5794   ObjCClassesWithCategories.insert(
5795     const_cast<ObjCInterfaceDecl *>(IFD->getDefinition()));
5796 }
5797 
DeclarationMarkedUsed(const Decl * D)5798 void ASTWriter::DeclarationMarkedUsed(const Decl *D) {
5799   assert(!WritingAST && "Already writing the AST!");
5800 
5801   // If there is *any* declaration of the entity that's not from an AST file,
5802   // we can skip writing the update record. We make sure that isUsed() triggers
5803   // completion of the redeclaration chain of the entity.
5804   for (auto Prev = D->getMostRecentDecl(); Prev; Prev = Prev->getPreviousDecl())
5805     if (IsLocalDecl(Prev))
5806       return;
5807 
5808   DeclUpdates[D].push_back(DeclUpdate(UPD_DECL_MARKED_USED));
5809 }
5810 
DeclarationMarkedOpenMPThreadPrivate(const Decl * D)5811 void ASTWriter::DeclarationMarkedOpenMPThreadPrivate(const Decl *D) {
5812   assert(!WritingAST && "Already writing the AST!");
5813   if (!D->isFromASTFile())
5814     return;
5815 
5816   DeclUpdates[D].push_back(DeclUpdate(UPD_DECL_MARKED_OPENMP_THREADPRIVATE));
5817 }
5818 
DeclarationMarkedOpenMPDeclareTarget(const Decl * D,const Attr * Attr)5819 void ASTWriter::DeclarationMarkedOpenMPDeclareTarget(const Decl *D,
5820                                                      const Attr *Attr) {
5821   assert(!WritingAST && "Already writing the AST!");
5822   if (!D->isFromASTFile())
5823     return;
5824 
5825   DeclUpdates[D].push_back(
5826       DeclUpdate(UPD_DECL_MARKED_OPENMP_DECLARETARGET, Attr));
5827 }
5828 
RedefinedHiddenDefinition(const NamedDecl * D,Module * M)5829 void ASTWriter::RedefinedHiddenDefinition(const NamedDecl *D, Module *M) {
5830   assert(!WritingAST && "Already writing the AST!");
5831   assert(D->isHidden() && "expected a hidden declaration");
5832   DeclUpdates[D].push_back(DeclUpdate(UPD_DECL_EXPORTED, M));
5833 }
5834 
AddedAttributeToRecord(const Attr * Attr,const RecordDecl * Record)5835 void ASTWriter::AddedAttributeToRecord(const Attr *Attr,
5836                                        const RecordDecl *Record) {
5837   assert(!WritingAST && "Already writing the AST!");
5838   if (!Record->isFromASTFile())
5839     return;
5840   DeclUpdates[Record].push_back(DeclUpdate(UPD_ADDED_ATTR_TO_RECORD, Attr));
5841 }
5842