ASTWriter.cpp revision eb382ec1507cf2c8c12d7443d0b67c076223aec6 
1//===--- ASTWriter.cpp - AST File Writer ----------------------------------===//
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 "ASTCommon.h"
16#include "clang/Sema/Sema.h"
17#include "clang/Sema/IdentifierResolver.h"
18#include "clang/AST/ASTContext.h"
19#include "clang/AST/Decl.h"
20#include "clang/AST/DeclContextInternals.h"
21#include "clang/AST/DeclTemplate.h"
22#include "clang/AST/DeclFriend.h"
23#include "clang/AST/Expr.h"
24#include "clang/AST/ExprCXX.h"
25#include "clang/AST/Type.h"
26#include "clang/AST/TypeLocVisitor.h"
27#include "clang/Serialization/ASTReader.h"
28#include "clang/Lex/MacroInfo.h"
29#include "clang/Lex/PreprocessingRecord.h"
30#include "clang/Lex/Preprocessor.h"
31#include "clang/Lex/HeaderSearch.h"
32#include "clang/Basic/FileManager.h"
33#include "clang/Basic/FileSystemStatCache.h"
34#include "clang/Basic/OnDiskHashTable.h"
35#include "clang/Basic/SourceManager.h"
36#include "clang/Basic/SourceManagerInternals.h"
37#include "clang/Basic/TargetInfo.h"
38#include "clang/Basic/Version.h"
39#include "clang/Basic/VersionTuple.h"
40#include "llvm/ADT/APFloat.h"
41#include "llvm/ADT/APInt.h"
42#include "llvm/ADT/StringExtras.h"
43#include "llvm/Bitcode/BitstreamWriter.h"
44#include "llvm/Support/FileSystem.h"
45#include "llvm/Support/MemoryBuffer.h"
46#include "llvm/Support/Path.h"
47#include <algorithm>
48#include <cstdio>
49#include <string.h>
50#include <utility>
51using namespace clang;
52using namespace clang::serialization;
53
54template <typename T, typename Allocator>
55static StringRef data(const std::vector<T, Allocator> &v) {
56  if (v.empty()) return StringRef();
57  return StringRef(reinterpret_cast<const char*>(&v[0]),
58                         sizeof(T) * v.size());
59}
60
61template <typename T>
62static StringRef data(const SmallVectorImpl<T> &v) {
63  return StringRef(reinterpret_cast<const char*>(v.data()),
64                         sizeof(T) * v.size());
65}
66
67//===----------------------------------------------------------------------===//
68// Type serialization
69//===----------------------------------------------------------------------===//
70
71namespace {
72  class ASTTypeWriter {
73    ASTWriter &Writer;
74    ASTWriter::RecordDataImpl &Record;
75
76  public:
77    /// \brief Type code that corresponds to the record generated.
78    TypeCode Code;
79
80    ASTTypeWriter(ASTWriter &Writer, ASTWriter::RecordDataImpl &Record)
81      : Writer(Writer), Record(Record), Code(TYPE_EXT_QUAL) { }
82
83    void VisitArrayType(const ArrayType *T);
84    void VisitFunctionType(const FunctionType *T);
85    void VisitTagType(const TagType *T);
86
87#define TYPE(Class, Base) void Visit##Class##Type(const Class##Type *T);
88#define ABSTRACT_TYPE(Class, Base)
89#include "clang/AST/TypeNodes.def"
90  };
91}
92
93void ASTTypeWriter::VisitBuiltinType(const BuiltinType *T) {
94  llvm_unreachable("Built-in types are never serialized");
95}
96
97void ASTTypeWriter::VisitComplexType(const ComplexType *T) {
98  Writer.AddTypeRef(T->getElementType(), Record);
99  Code = TYPE_COMPLEX;
100}
101
102void ASTTypeWriter::VisitPointerType(const PointerType *T) {
103  Writer.AddTypeRef(T->getPointeeType(), Record);
104  Code = TYPE_POINTER;
105}
106
107void ASTTypeWriter::VisitBlockPointerType(const BlockPointerType *T) {
108  Writer.AddTypeRef(T->getPointeeType(), Record);
109  Code = TYPE_BLOCK_POINTER;
110}
111
112void ASTTypeWriter::VisitLValueReferenceType(const LValueReferenceType *T) {
113  Writer.AddTypeRef(T->getPointeeTypeAsWritten(), Record);
114  Record.push_back(T->isSpelledAsLValue());
115  Code = TYPE_LVALUE_REFERENCE;
116}
117
118void ASTTypeWriter::VisitRValueReferenceType(const RValueReferenceType *T) {
119  Writer.AddTypeRef(T->getPointeeTypeAsWritten(), Record);
120  Code = TYPE_RVALUE_REFERENCE;
121}
122
123void ASTTypeWriter::VisitMemberPointerType(const MemberPointerType *T) {
124  Writer.AddTypeRef(T->getPointeeType(), Record);
125  Writer.AddTypeRef(QualType(T->getClass(), 0), Record);
126  Code = TYPE_MEMBER_POINTER;
127}
128
129void ASTTypeWriter::VisitArrayType(const ArrayType *T) {
130  Writer.AddTypeRef(T->getElementType(), Record);
131  Record.push_back(T->getSizeModifier()); // FIXME: stable values
132  Record.push_back(T->getIndexTypeCVRQualifiers()); // FIXME: stable values
133}
134
135void ASTTypeWriter::VisitConstantArrayType(const ConstantArrayType *T) {
136  VisitArrayType(T);
137  Writer.AddAPInt(T->getSize(), Record);
138  Code = TYPE_CONSTANT_ARRAY;
139}
140
141void ASTTypeWriter::VisitIncompleteArrayType(const IncompleteArrayType *T) {
142  VisitArrayType(T);
143  Code = TYPE_INCOMPLETE_ARRAY;
144}
145
146void ASTTypeWriter::VisitVariableArrayType(const VariableArrayType *T) {
147  VisitArrayType(T);
148  Writer.AddSourceLocation(T->getLBracketLoc(), Record);
149  Writer.AddSourceLocation(T->getRBracketLoc(), Record);
150  Writer.AddStmt(T->getSizeExpr());
151  Code = TYPE_VARIABLE_ARRAY;
152}
153
154void ASTTypeWriter::VisitVectorType(const VectorType *T) {
155  Writer.AddTypeRef(T->getElementType(), Record);
156  Record.push_back(T->getNumElements());
157  Record.push_back(T->getVectorKind());
158  Code = TYPE_VECTOR;
159}
160
161void ASTTypeWriter::VisitExtVectorType(const ExtVectorType *T) {
162  VisitVectorType(T);
163  Code = TYPE_EXT_VECTOR;
164}
165
166void ASTTypeWriter::VisitFunctionType(const FunctionType *T) {
167  Writer.AddTypeRef(T->getResultType(), Record);
168  FunctionType::ExtInfo C = T->getExtInfo();
169  Record.push_back(C.getNoReturn());
170  Record.push_back(C.getHasRegParm());
171  Record.push_back(C.getRegParm());
172  // FIXME: need to stabilize encoding of calling convention...
173  Record.push_back(C.getCC());
174  Record.push_back(C.getProducesResult());
175}
176
177void ASTTypeWriter::VisitFunctionNoProtoType(const FunctionNoProtoType *T) {
178  VisitFunctionType(T);
179  Code = TYPE_FUNCTION_NO_PROTO;
180}
181
182void ASTTypeWriter::VisitFunctionProtoType(const FunctionProtoType *T) {
183  VisitFunctionType(T);
184  Record.push_back(T->getNumArgs());
185  for (unsigned I = 0, N = T->getNumArgs(); I != N; ++I)
186    Writer.AddTypeRef(T->getArgType(I), Record);
187  Record.push_back(T->isVariadic());
188  Record.push_back(T->hasTrailingReturn());
189  Record.push_back(T->getTypeQuals());
190  Record.push_back(static_cast<unsigned>(T->getRefQualifier()));
191  Record.push_back(T->getExceptionSpecType());
192  if (T->getExceptionSpecType() == EST_Dynamic) {
193    Record.push_back(T->getNumExceptions());
194    for (unsigned I = 0, N = T->getNumExceptions(); I != N; ++I)
195      Writer.AddTypeRef(T->getExceptionType(I), Record);
196  } else if (T->getExceptionSpecType() == EST_ComputedNoexcept) {
197    Writer.AddStmt(T->getNoexceptExpr());
198  }
199  Code = TYPE_FUNCTION_PROTO;
200}
201
202void ASTTypeWriter::VisitUnresolvedUsingType(const UnresolvedUsingType *T) {
203  Writer.AddDeclRef(T->getDecl(), Record);
204  Code = TYPE_UNRESOLVED_USING;
205}
206
207void ASTTypeWriter::VisitTypedefType(const TypedefType *T) {
208  Writer.AddDeclRef(T->getDecl(), Record);
209  assert(!T->isCanonicalUnqualified() && "Invalid typedef ?");
210  Writer.AddTypeRef(T->getCanonicalTypeInternal(), Record);
211  Code = TYPE_TYPEDEF;
212}
213
214void ASTTypeWriter::VisitTypeOfExprType(const TypeOfExprType *T) {
215  Writer.AddStmt(T->getUnderlyingExpr());
216  Code = TYPE_TYPEOF_EXPR;
217}
218
219void ASTTypeWriter::VisitTypeOfType(const TypeOfType *T) {
220  Writer.AddTypeRef(T->getUnderlyingType(), Record);
221  Code = TYPE_TYPEOF;
222}
223
224void ASTTypeWriter::VisitDecltypeType(const DecltypeType *T) {
225  Writer.AddTypeRef(T->getUnderlyingType(), Record);
226  Writer.AddStmt(T->getUnderlyingExpr());
227  Code = TYPE_DECLTYPE;
228}
229
230void ASTTypeWriter::VisitUnaryTransformType(const UnaryTransformType *T) {
231  Writer.AddTypeRef(T->getBaseType(), Record);
232  Writer.AddTypeRef(T->getUnderlyingType(), Record);
233  Record.push_back(T->getUTTKind());
234  Code = TYPE_UNARY_TRANSFORM;
235}
236
237void ASTTypeWriter::VisitAutoType(const AutoType *T) {
238  Writer.AddTypeRef(T->getDeducedType(), Record);
239  Code = TYPE_AUTO;
240}
241
242void ASTTypeWriter::VisitTagType(const TagType *T) {
243  Record.push_back(T->isDependentType());
244  Writer.AddDeclRef(T->getDecl()->getCanonicalDecl(), Record);
245  assert(!T->isBeingDefined() &&
246         "Cannot serialize in the middle of a type definition");
247}
248
249void ASTTypeWriter::VisitRecordType(const RecordType *T) {
250  VisitTagType(T);
251  Code = TYPE_RECORD;
252}
253
254void ASTTypeWriter::VisitEnumType(const EnumType *T) {
255  VisitTagType(T);
256  Code = TYPE_ENUM;
257}
258
259void ASTTypeWriter::VisitAttributedType(const AttributedType *T) {
260  Writer.AddTypeRef(T->getModifiedType(), Record);
261  Writer.AddTypeRef(T->getEquivalentType(), Record);
262  Record.push_back(T->getAttrKind());
263  Code = TYPE_ATTRIBUTED;
264}
265
266void
267ASTTypeWriter::VisitSubstTemplateTypeParmType(
268                                        const SubstTemplateTypeParmType *T) {
269  Writer.AddTypeRef(QualType(T->getReplacedParameter(), 0), Record);
270  Writer.AddTypeRef(T->getReplacementType(), Record);
271  Code = TYPE_SUBST_TEMPLATE_TYPE_PARM;
272}
273
274void
275ASTTypeWriter::VisitSubstTemplateTypeParmPackType(
276                                      const SubstTemplateTypeParmPackType *T) {
277  Writer.AddTypeRef(QualType(T->getReplacedParameter(), 0), Record);
278  Writer.AddTemplateArgument(T->getArgumentPack(), Record);
279  Code = TYPE_SUBST_TEMPLATE_TYPE_PARM_PACK;
280}
281
282void
283ASTTypeWriter::VisitTemplateSpecializationType(
284                                       const TemplateSpecializationType *T) {
285  Record.push_back(T->isDependentType());
286  Writer.AddTemplateName(T->getTemplateName(), Record);
287  Record.push_back(T->getNumArgs());
288  for (TemplateSpecializationType::iterator ArgI = T->begin(), ArgE = T->end();
289         ArgI != ArgE; ++ArgI)
290    Writer.AddTemplateArgument(*ArgI, Record);
291  Writer.AddTypeRef(T->isTypeAlias() ? T->getAliasedType() :
292                    T->isCanonicalUnqualified() ? QualType()
293                                                : T->getCanonicalTypeInternal(),
294                    Record);
295  Code = TYPE_TEMPLATE_SPECIALIZATION;
296}
297
298void
299ASTTypeWriter::VisitDependentSizedArrayType(const DependentSizedArrayType *T) {
300  VisitArrayType(T);
301  Writer.AddStmt(T->getSizeExpr());
302  Writer.AddSourceRange(T->getBracketsRange(), Record);
303  Code = TYPE_DEPENDENT_SIZED_ARRAY;
304}
305
306void
307ASTTypeWriter::VisitDependentSizedExtVectorType(
308                                        const DependentSizedExtVectorType *T) {
309  // FIXME: Serialize this type (C++ only)
310  llvm_unreachable("Cannot serialize dependent sized extended vector types");
311}
312
313void
314ASTTypeWriter::VisitTemplateTypeParmType(const TemplateTypeParmType *T) {
315  Record.push_back(T->getDepth());
316  Record.push_back(T->getIndex());
317  Record.push_back(T->isParameterPack());
318  Writer.AddDeclRef(T->getDecl(), Record);
319  Code = TYPE_TEMPLATE_TYPE_PARM;
320}
321
322void
323ASTTypeWriter::VisitDependentNameType(const DependentNameType *T) {
324  Record.push_back(T->getKeyword());
325  Writer.AddNestedNameSpecifier(T->getQualifier(), Record);
326  Writer.AddIdentifierRef(T->getIdentifier(), Record);
327  Writer.AddTypeRef(T->isCanonicalUnqualified() ? QualType()
328                                                : T->getCanonicalTypeInternal(),
329                    Record);
330  Code = TYPE_DEPENDENT_NAME;
331}
332
333void
334ASTTypeWriter::VisitDependentTemplateSpecializationType(
335                                const DependentTemplateSpecializationType *T) {
336  Record.push_back(T->getKeyword());
337  Writer.AddNestedNameSpecifier(T->getQualifier(), Record);
338  Writer.AddIdentifierRef(T->getIdentifier(), Record);
339  Record.push_back(T->getNumArgs());
340  for (DependentTemplateSpecializationType::iterator
341         I = T->begin(), E = T->end(); I != E; ++I)
342    Writer.AddTemplateArgument(*I, Record);
343  Code = TYPE_DEPENDENT_TEMPLATE_SPECIALIZATION;
344}
345
346void ASTTypeWriter::VisitPackExpansionType(const PackExpansionType *T) {
347  Writer.AddTypeRef(T->getPattern(), Record);
348  if (llvm::Optional<unsigned> NumExpansions = T->getNumExpansions())
349    Record.push_back(*NumExpansions + 1);
350  else
351    Record.push_back(0);
352  Code = TYPE_PACK_EXPANSION;
353}
354
355void ASTTypeWriter::VisitParenType(const ParenType *T) {
356  Writer.AddTypeRef(T->getInnerType(), Record);
357  Code = TYPE_PAREN;
358}
359
360void ASTTypeWriter::VisitElaboratedType(const ElaboratedType *T) {
361  Record.push_back(T->getKeyword());
362  Writer.AddNestedNameSpecifier(T->getQualifier(), Record);
363  Writer.AddTypeRef(T->getNamedType(), Record);
364  Code = TYPE_ELABORATED;
365}
366
367void ASTTypeWriter::VisitInjectedClassNameType(const InjectedClassNameType *T) {
368  Writer.AddDeclRef(T->getDecl()->getCanonicalDecl(), Record);
369  Writer.AddTypeRef(T->getInjectedSpecializationType(), Record);
370  Code = TYPE_INJECTED_CLASS_NAME;
371}
372
373void ASTTypeWriter::VisitObjCInterfaceType(const ObjCInterfaceType *T) {
374  Writer.AddDeclRef(T->getDecl()->getCanonicalDecl(), Record);
375  Code = TYPE_OBJC_INTERFACE;
376}
377
378void ASTTypeWriter::VisitObjCObjectType(const ObjCObjectType *T) {
379  Writer.AddTypeRef(T->getBaseType(), Record);
380  Record.push_back(T->getNumProtocols());
381  for (ObjCObjectType::qual_iterator I = T->qual_begin(),
382       E = T->qual_end(); I != E; ++I)
383    Writer.AddDeclRef(*I, Record);
384  Code = TYPE_OBJC_OBJECT;
385}
386
387void
388ASTTypeWriter::VisitObjCObjectPointerType(const ObjCObjectPointerType *T) {
389  Writer.AddTypeRef(T->getPointeeType(), Record);
390  Code = TYPE_OBJC_OBJECT_POINTER;
391}
392
393void
394ASTTypeWriter::VisitAtomicType(const AtomicType *T) {
395  Writer.AddTypeRef(T->getValueType(), Record);
396  Code = TYPE_ATOMIC;
397}
398
399namespace {
400
401class TypeLocWriter : public TypeLocVisitor<TypeLocWriter> {
402  ASTWriter &Writer;
403  ASTWriter::RecordDataImpl &Record;
404
405public:
406  TypeLocWriter(ASTWriter &Writer, ASTWriter::RecordDataImpl &Record)
407    : Writer(Writer), Record(Record) { }
408
409#define ABSTRACT_TYPELOC(CLASS, PARENT)
410#define TYPELOC(CLASS, PARENT) \
411    void Visit##CLASS##TypeLoc(CLASS##TypeLoc TyLoc);
412#include "clang/AST/TypeLocNodes.def"
413
414  void VisitArrayTypeLoc(ArrayTypeLoc TyLoc);
415  void VisitFunctionTypeLoc(FunctionTypeLoc TyLoc);
416};
417
418}
419
420void TypeLocWriter::VisitQualifiedTypeLoc(QualifiedTypeLoc TL) {
421  // nothing to do
422}
423void TypeLocWriter::VisitBuiltinTypeLoc(BuiltinTypeLoc TL) {
424  Writer.AddSourceLocation(TL.getBuiltinLoc(), Record);
425  if (TL.needsExtraLocalData()) {
426    Record.push_back(TL.getWrittenTypeSpec());
427    Record.push_back(TL.getWrittenSignSpec());
428    Record.push_back(TL.getWrittenWidthSpec());
429    Record.push_back(TL.hasModeAttr());
430  }
431}
432void TypeLocWriter::VisitComplexTypeLoc(ComplexTypeLoc TL) {
433  Writer.AddSourceLocation(TL.getNameLoc(), Record);
434}
435void TypeLocWriter::VisitPointerTypeLoc(PointerTypeLoc TL) {
436  Writer.AddSourceLocation(TL.getStarLoc(), Record);
437}
438void TypeLocWriter::VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) {
439  Writer.AddSourceLocation(TL.getCaretLoc(), Record);
440}
441void TypeLocWriter::VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) {
442  Writer.AddSourceLocation(TL.getAmpLoc(), Record);
443}
444void TypeLocWriter::VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) {
445  Writer.AddSourceLocation(TL.getAmpAmpLoc(), Record);
446}
447void TypeLocWriter::VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) {
448  Writer.AddSourceLocation(TL.getStarLoc(), Record);
449  Writer.AddTypeSourceInfo(TL.getClassTInfo(), Record);
450}
451void TypeLocWriter::VisitArrayTypeLoc(ArrayTypeLoc TL) {
452  Writer.AddSourceLocation(TL.getLBracketLoc(), Record);
453  Writer.AddSourceLocation(TL.getRBracketLoc(), Record);
454  Record.push_back(TL.getSizeExpr() ? 1 : 0);
455  if (TL.getSizeExpr())
456    Writer.AddStmt(TL.getSizeExpr());
457}
458void TypeLocWriter::VisitConstantArrayTypeLoc(ConstantArrayTypeLoc TL) {
459  VisitArrayTypeLoc(TL);
460}
461void TypeLocWriter::VisitIncompleteArrayTypeLoc(IncompleteArrayTypeLoc TL) {
462  VisitArrayTypeLoc(TL);
463}
464void TypeLocWriter::VisitVariableArrayTypeLoc(VariableArrayTypeLoc TL) {
465  VisitArrayTypeLoc(TL);
466}
467void TypeLocWriter::VisitDependentSizedArrayTypeLoc(
468                                            DependentSizedArrayTypeLoc TL) {
469  VisitArrayTypeLoc(TL);
470}
471void TypeLocWriter::VisitDependentSizedExtVectorTypeLoc(
472                                        DependentSizedExtVectorTypeLoc TL) {
473  Writer.AddSourceLocation(TL.getNameLoc(), Record);
474}
475void TypeLocWriter::VisitVectorTypeLoc(VectorTypeLoc TL) {
476  Writer.AddSourceLocation(TL.getNameLoc(), Record);
477}
478void TypeLocWriter::VisitExtVectorTypeLoc(ExtVectorTypeLoc TL) {
479  Writer.AddSourceLocation(TL.getNameLoc(), Record);
480}
481void TypeLocWriter::VisitFunctionTypeLoc(FunctionTypeLoc TL) {
482  Writer.AddSourceLocation(TL.getLocalRangeBegin(), Record);
483  Writer.AddSourceLocation(TL.getLocalRangeEnd(), Record);
484  Record.push_back(TL.getTrailingReturn());
485  for (unsigned i = 0, e = TL.getNumArgs(); i != e; ++i)
486    Writer.AddDeclRef(TL.getArg(i), Record);
487}
488void TypeLocWriter::VisitFunctionProtoTypeLoc(FunctionProtoTypeLoc TL) {
489  VisitFunctionTypeLoc(TL);
490}
491void TypeLocWriter::VisitFunctionNoProtoTypeLoc(FunctionNoProtoTypeLoc TL) {
492  VisitFunctionTypeLoc(TL);
493}
494void TypeLocWriter::VisitUnresolvedUsingTypeLoc(UnresolvedUsingTypeLoc TL) {
495  Writer.AddSourceLocation(TL.getNameLoc(), Record);
496}
497void TypeLocWriter::VisitTypedefTypeLoc(TypedefTypeLoc TL) {
498  Writer.AddSourceLocation(TL.getNameLoc(), Record);
499}
500void TypeLocWriter::VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) {
501  Writer.AddSourceLocation(TL.getTypeofLoc(), Record);
502  Writer.AddSourceLocation(TL.getLParenLoc(), Record);
503  Writer.AddSourceLocation(TL.getRParenLoc(), Record);
504}
505void TypeLocWriter::VisitTypeOfTypeLoc(TypeOfTypeLoc TL) {
506  Writer.AddSourceLocation(TL.getTypeofLoc(), Record);
507  Writer.AddSourceLocation(TL.getLParenLoc(), Record);
508  Writer.AddSourceLocation(TL.getRParenLoc(), Record);
509  Writer.AddTypeSourceInfo(TL.getUnderlyingTInfo(), Record);
510}
511void TypeLocWriter::VisitDecltypeTypeLoc(DecltypeTypeLoc TL) {
512  Writer.AddSourceLocation(TL.getNameLoc(), Record);
513}
514void TypeLocWriter::VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) {
515  Writer.AddSourceLocation(TL.getKWLoc(), Record);
516  Writer.AddSourceLocation(TL.getLParenLoc(), Record);
517  Writer.AddSourceLocation(TL.getRParenLoc(), Record);
518  Writer.AddTypeSourceInfo(TL.getUnderlyingTInfo(), Record);
519}
520void TypeLocWriter::VisitAutoTypeLoc(AutoTypeLoc TL) {
521  Writer.AddSourceLocation(TL.getNameLoc(), Record);
522}
523void TypeLocWriter::VisitRecordTypeLoc(RecordTypeLoc TL) {
524  Writer.AddSourceLocation(TL.getNameLoc(), Record);
525}
526void TypeLocWriter::VisitEnumTypeLoc(EnumTypeLoc TL) {
527  Writer.AddSourceLocation(TL.getNameLoc(), Record);
528}
529void TypeLocWriter::VisitAttributedTypeLoc(AttributedTypeLoc TL) {
530  Writer.AddSourceLocation(TL.getAttrNameLoc(), Record);
531  if (TL.hasAttrOperand()) {
532    SourceRange range = TL.getAttrOperandParensRange();
533    Writer.AddSourceLocation(range.getBegin(), Record);
534    Writer.AddSourceLocation(range.getEnd(), Record);
535  }
536  if (TL.hasAttrExprOperand()) {
537    Expr *operand = TL.getAttrExprOperand();
538    Record.push_back(operand ? 1 : 0);
539    if (operand) Writer.AddStmt(operand);
540  } else if (TL.hasAttrEnumOperand()) {
541    Writer.AddSourceLocation(TL.getAttrEnumOperandLoc(), Record);
542  }
543}
544void TypeLocWriter::VisitTemplateTypeParmTypeLoc(TemplateTypeParmTypeLoc TL) {
545  Writer.AddSourceLocation(TL.getNameLoc(), Record);
546}
547void TypeLocWriter::VisitSubstTemplateTypeParmTypeLoc(
548                                            SubstTemplateTypeParmTypeLoc TL) {
549  Writer.AddSourceLocation(TL.getNameLoc(), Record);
550}
551void TypeLocWriter::VisitSubstTemplateTypeParmPackTypeLoc(
552                                          SubstTemplateTypeParmPackTypeLoc TL) {
553  Writer.AddSourceLocation(TL.getNameLoc(), Record);
554}
555void TypeLocWriter::VisitTemplateSpecializationTypeLoc(
556                                           TemplateSpecializationTypeLoc TL) {
557  Writer.AddSourceLocation(TL.getTemplateKeywordLoc(), Record);
558  Writer.AddSourceLocation(TL.getTemplateNameLoc(), Record);
559  Writer.AddSourceLocation(TL.getLAngleLoc(), Record);
560  Writer.AddSourceLocation(TL.getRAngleLoc(), Record);
561  for (unsigned i = 0, e = TL.getNumArgs(); i != e; ++i)
562    Writer.AddTemplateArgumentLocInfo(TL.getArgLoc(i).getArgument().getKind(),
563                                      TL.getArgLoc(i).getLocInfo(), Record);
564}
565void TypeLocWriter::VisitParenTypeLoc(ParenTypeLoc TL) {
566  Writer.AddSourceLocation(TL.getLParenLoc(), Record);
567  Writer.AddSourceLocation(TL.getRParenLoc(), Record);
568}
569void TypeLocWriter::VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) {
570  Writer.AddSourceLocation(TL.getElaboratedKeywordLoc(), Record);
571  Writer.AddNestedNameSpecifierLoc(TL.getQualifierLoc(), Record);
572}
573void TypeLocWriter::VisitInjectedClassNameTypeLoc(InjectedClassNameTypeLoc TL) {
574  Writer.AddSourceLocation(TL.getNameLoc(), Record);
575}
576void TypeLocWriter::VisitDependentNameTypeLoc(DependentNameTypeLoc TL) {
577  Writer.AddSourceLocation(TL.getElaboratedKeywordLoc(), Record);
578  Writer.AddNestedNameSpecifierLoc(TL.getQualifierLoc(), Record);
579  Writer.AddSourceLocation(TL.getNameLoc(), Record);
580}
581void TypeLocWriter::VisitDependentTemplateSpecializationTypeLoc(
582       DependentTemplateSpecializationTypeLoc TL) {
583  Writer.AddSourceLocation(TL.getElaboratedKeywordLoc(), Record);
584  Writer.AddNestedNameSpecifierLoc(TL.getQualifierLoc(), Record);
585  Writer.AddSourceLocation(TL.getTemplateKeywordLoc(), Record);
586  Writer.AddSourceLocation(TL.getTemplateNameLoc(), Record);
587  Writer.AddSourceLocation(TL.getLAngleLoc(), Record);
588  Writer.AddSourceLocation(TL.getRAngleLoc(), Record);
589  for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I)
590    Writer.AddTemplateArgumentLocInfo(TL.getArgLoc(I).getArgument().getKind(),
591                                      TL.getArgLoc(I).getLocInfo(), Record);
592}
593void TypeLocWriter::VisitPackExpansionTypeLoc(PackExpansionTypeLoc TL) {
594  Writer.AddSourceLocation(TL.getEllipsisLoc(), Record);
595}
596void TypeLocWriter::VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) {
597  Writer.AddSourceLocation(TL.getNameLoc(), Record);
598}
599void TypeLocWriter::VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) {
600  Record.push_back(TL.hasBaseTypeAsWritten());
601  Writer.AddSourceLocation(TL.getLAngleLoc(), Record);
602  Writer.AddSourceLocation(TL.getRAngleLoc(), Record);
603  for (unsigned i = 0, e = TL.getNumProtocols(); i != e; ++i)
604    Writer.AddSourceLocation(TL.getProtocolLoc(i), Record);
605}
606void TypeLocWriter::VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) {
607  Writer.AddSourceLocation(TL.getStarLoc(), Record);
608}
609void TypeLocWriter::VisitAtomicTypeLoc(AtomicTypeLoc TL) {
610  Writer.AddSourceLocation(TL.getKWLoc(), Record);
611  Writer.AddSourceLocation(TL.getLParenLoc(), Record);
612  Writer.AddSourceLocation(TL.getRParenLoc(), Record);
613}
614
615//===----------------------------------------------------------------------===//
616// ASTWriter Implementation
617//===----------------------------------------------------------------------===//
618
619static void EmitBlockID(unsigned ID, const char *Name,
620                        llvm::BitstreamWriter &Stream,
621                        ASTWriter::RecordDataImpl &Record) {
622  Record.clear();
623  Record.push_back(ID);
624  Stream.EmitRecord(llvm::bitc::BLOCKINFO_CODE_SETBID, Record);
625
626  // Emit the block name if present.
627  if (Name == 0 || Name[0] == 0) return;
628  Record.clear();
629  while (*Name)
630    Record.push_back(*Name++);
631  Stream.EmitRecord(llvm::bitc::BLOCKINFO_CODE_BLOCKNAME, Record);
632}
633
634static void EmitRecordID(unsigned ID, const char *Name,
635                         llvm::BitstreamWriter &Stream,
636                         ASTWriter::RecordDataImpl &Record) {
637  Record.clear();
638  Record.push_back(ID);
639  while (*Name)
640    Record.push_back(*Name++);
641  Stream.EmitRecord(llvm::bitc::BLOCKINFO_CODE_SETRECORDNAME, Record);
642}
643
644static void AddStmtsExprs(llvm::BitstreamWriter &Stream,
645                          ASTWriter::RecordDataImpl &Record) {
646#define RECORD(X) EmitRecordID(X, #X, Stream, Record)
647  RECORD(STMT_STOP);
648  RECORD(STMT_NULL_PTR);
649  RECORD(STMT_NULL);
650  RECORD(STMT_COMPOUND);
651  RECORD(STMT_CASE);
652  RECORD(STMT_DEFAULT);
653  RECORD(STMT_LABEL);
654  RECORD(STMT_ATTRIBUTED);
655  RECORD(STMT_IF);
656  RECORD(STMT_SWITCH);
657  RECORD(STMT_WHILE);
658  RECORD(STMT_DO);
659  RECORD(STMT_FOR);
660  RECORD(STMT_GOTO);
661  RECORD(STMT_INDIRECT_GOTO);
662  RECORD(STMT_CONTINUE);
663  RECORD(STMT_BREAK);
664  RECORD(STMT_RETURN);
665  RECORD(STMT_DECL);
666  RECORD(STMT_ASM);
667  RECORD(EXPR_PREDEFINED);
668  RECORD(EXPR_DECL_REF);
669  RECORD(EXPR_INTEGER_LITERAL);
670  RECORD(EXPR_FLOATING_LITERAL);
671  RECORD(EXPR_IMAGINARY_LITERAL);
672  RECORD(EXPR_STRING_LITERAL);
673  RECORD(EXPR_CHARACTER_LITERAL);
674  RECORD(EXPR_PAREN);
675  RECORD(EXPR_UNARY_OPERATOR);
676  RECORD(EXPR_SIZEOF_ALIGN_OF);
677  RECORD(EXPR_ARRAY_SUBSCRIPT);
678  RECORD(EXPR_CALL);
679  RECORD(EXPR_MEMBER);
680  RECORD(EXPR_BINARY_OPERATOR);
681  RECORD(EXPR_COMPOUND_ASSIGN_OPERATOR);
682  RECORD(EXPR_CONDITIONAL_OPERATOR);
683  RECORD(EXPR_IMPLICIT_CAST);
684  RECORD(EXPR_CSTYLE_CAST);
685  RECORD(EXPR_COMPOUND_LITERAL);
686  RECORD(EXPR_EXT_VECTOR_ELEMENT);
687  RECORD(EXPR_INIT_LIST);
688  RECORD(EXPR_DESIGNATED_INIT);
689  RECORD(EXPR_IMPLICIT_VALUE_INIT);
690  RECORD(EXPR_VA_ARG);
691  RECORD(EXPR_ADDR_LABEL);
692  RECORD(EXPR_STMT);
693  RECORD(EXPR_CHOOSE);
694  RECORD(EXPR_GNU_NULL);
695  RECORD(EXPR_SHUFFLE_VECTOR);
696  RECORD(EXPR_BLOCK);
697  RECORD(EXPR_GENERIC_SELECTION);
698  RECORD(EXPR_OBJC_STRING_LITERAL);
699  RECORD(EXPR_OBJC_BOXED_EXPRESSION);
700  RECORD(EXPR_OBJC_ARRAY_LITERAL);
701  RECORD(EXPR_OBJC_DICTIONARY_LITERAL);
702  RECORD(EXPR_OBJC_ENCODE);
703  RECORD(EXPR_OBJC_SELECTOR_EXPR);
704  RECORD(EXPR_OBJC_PROTOCOL_EXPR);
705  RECORD(EXPR_OBJC_IVAR_REF_EXPR);
706  RECORD(EXPR_OBJC_PROPERTY_REF_EXPR);
707  RECORD(EXPR_OBJC_KVC_REF_EXPR);
708  RECORD(EXPR_OBJC_MESSAGE_EXPR);
709  RECORD(STMT_OBJC_FOR_COLLECTION);
710  RECORD(STMT_OBJC_CATCH);
711  RECORD(STMT_OBJC_FINALLY);
712  RECORD(STMT_OBJC_AT_TRY);
713  RECORD(STMT_OBJC_AT_SYNCHRONIZED);
714  RECORD(STMT_OBJC_AT_THROW);
715  RECORD(EXPR_OBJC_BOOL_LITERAL);
716  RECORD(EXPR_CXX_OPERATOR_CALL);
717  RECORD(EXPR_CXX_CONSTRUCT);
718  RECORD(EXPR_CXX_STATIC_CAST);
719  RECORD(EXPR_CXX_DYNAMIC_CAST);
720  RECORD(EXPR_CXX_REINTERPRET_CAST);
721  RECORD(EXPR_CXX_CONST_CAST);
722  RECORD(EXPR_CXX_FUNCTIONAL_CAST);
723  RECORD(EXPR_USER_DEFINED_LITERAL);
724  RECORD(EXPR_CXX_BOOL_LITERAL);
725  RECORD(EXPR_CXX_NULL_PTR_LITERAL);
726  RECORD(EXPR_CXX_TYPEID_EXPR);
727  RECORD(EXPR_CXX_TYPEID_TYPE);
728  RECORD(EXPR_CXX_UUIDOF_EXPR);
729  RECORD(EXPR_CXX_UUIDOF_TYPE);
730  RECORD(EXPR_CXX_THIS);
731  RECORD(EXPR_CXX_THROW);
732  RECORD(EXPR_CXX_DEFAULT_ARG);
733  RECORD(EXPR_CXX_BIND_TEMPORARY);
734  RECORD(EXPR_CXX_SCALAR_VALUE_INIT);
735  RECORD(EXPR_CXX_NEW);
736  RECORD(EXPR_CXX_DELETE);
737  RECORD(EXPR_CXX_PSEUDO_DESTRUCTOR);
738  RECORD(EXPR_EXPR_WITH_CLEANUPS);
739  RECORD(EXPR_CXX_DEPENDENT_SCOPE_MEMBER);
740  RECORD(EXPR_CXX_DEPENDENT_SCOPE_DECL_REF);
741  RECORD(EXPR_CXX_UNRESOLVED_CONSTRUCT);
742  RECORD(EXPR_CXX_UNRESOLVED_MEMBER);
743  RECORD(EXPR_CXX_UNRESOLVED_LOOKUP);
744  RECORD(EXPR_CXX_UNARY_TYPE_TRAIT);
745  RECORD(EXPR_CXX_NOEXCEPT);
746  RECORD(EXPR_OPAQUE_VALUE);
747  RECORD(EXPR_BINARY_TYPE_TRAIT);
748  RECORD(EXPR_PACK_EXPANSION);
749  RECORD(EXPR_SIZEOF_PACK);
750  RECORD(EXPR_SUBST_NON_TYPE_TEMPLATE_PARM_PACK);
751  RECORD(EXPR_CUDA_KERNEL_CALL);
752#undef RECORD
753}
754
755void ASTWriter::WriteBlockInfoBlock() {
756  RecordData Record;
757  Stream.EnterSubblock(llvm::bitc::BLOCKINFO_BLOCK_ID, 3);
758
759#define BLOCK(X) EmitBlockID(X ## _ID, #X, Stream, Record)
760#define RECORD(X) EmitRecordID(X, #X, Stream, Record)
761
762  // AST Top-Level Block.
763  BLOCK(AST_BLOCK);
764  RECORD(ORIGINAL_FILE_NAME);
765  RECORD(ORIGINAL_FILE_ID);
766  RECORD(TYPE_OFFSET);
767  RECORD(DECL_OFFSET);
768  RECORD(LANGUAGE_OPTIONS);
769  RECORD(METADATA);
770  RECORD(IDENTIFIER_OFFSET);
771  RECORD(IDENTIFIER_TABLE);
772  RECORD(EXTERNAL_DEFINITIONS);
773  RECORD(SPECIAL_TYPES);
774  RECORD(STATISTICS);
775  RECORD(TENTATIVE_DEFINITIONS);
776  RECORD(UNUSED_FILESCOPED_DECLS);
777  RECORD(LOCALLY_SCOPED_EXTERNAL_DECLS);
778  RECORD(SELECTOR_OFFSETS);
779  RECORD(METHOD_POOL);
780  RECORD(PP_COUNTER_VALUE);
781  RECORD(SOURCE_LOCATION_OFFSETS);
782  RECORD(SOURCE_LOCATION_PRELOADS);
783  RECORD(STAT_CACHE);
784  RECORD(EXT_VECTOR_DECLS);
785  RECORD(VERSION_CONTROL_BRANCH_REVISION);
786  RECORD(PPD_ENTITIES_OFFSETS);
787  RECORD(IMPORTS);
788  RECORD(REFERENCED_SELECTOR_POOL);
789  RECORD(TU_UPDATE_LEXICAL);
790  RECORD(LOCAL_REDECLARATIONS_MAP);
791  RECORD(SEMA_DECL_REFS);
792  RECORD(WEAK_UNDECLARED_IDENTIFIERS);
793  RECORD(PENDING_IMPLICIT_INSTANTIATIONS);
794  RECORD(DECL_REPLACEMENTS);
795  RECORD(UPDATE_VISIBLE);
796  RECORD(DECL_UPDATE_OFFSETS);
797  RECORD(DECL_UPDATES);
798  RECORD(CXX_BASE_SPECIFIER_OFFSETS);
799  RECORD(DIAG_PRAGMA_MAPPINGS);
800  RECORD(CUDA_SPECIAL_DECL_REFS);
801  RECORD(HEADER_SEARCH_TABLE);
802  RECORD(ORIGINAL_PCH_DIR);
803  RECORD(FP_PRAGMA_OPTIONS);
804  RECORD(OPENCL_EXTENSIONS);
805  RECORD(DELEGATING_CTORS);
806  RECORD(FILE_SOURCE_LOCATION_OFFSETS);
807  RECORD(KNOWN_NAMESPACES);
808  RECORD(MODULE_OFFSET_MAP);
809  RECORD(SOURCE_MANAGER_LINE_TABLE);
810  RECORD(OBJC_CATEGORIES_MAP);
811  RECORD(FILE_SORTED_DECLS);
812  RECORD(IMPORTED_MODULES);
813  RECORD(MERGED_DECLARATIONS);
814  RECORD(LOCAL_REDECLARATIONS);
815  RECORD(OBJC_CATEGORIES);
816
817  // SourceManager Block.
818  BLOCK(SOURCE_MANAGER_BLOCK);
819  RECORD(SM_SLOC_FILE_ENTRY);
820  RECORD(SM_SLOC_BUFFER_ENTRY);
821  RECORD(SM_SLOC_BUFFER_BLOB);
822  RECORD(SM_SLOC_EXPANSION_ENTRY);
823
824  // Preprocessor Block.
825  BLOCK(PREPROCESSOR_BLOCK);
826  RECORD(PP_MACRO_OBJECT_LIKE);
827  RECORD(PP_MACRO_FUNCTION_LIKE);
828  RECORD(PP_TOKEN);
829
830  // Decls and Types block.
831  BLOCK(DECLTYPES_BLOCK);
832  RECORD(TYPE_EXT_QUAL);
833  RECORD(TYPE_COMPLEX);
834  RECORD(TYPE_POINTER);
835  RECORD(TYPE_BLOCK_POINTER);
836  RECORD(TYPE_LVALUE_REFERENCE);
837  RECORD(TYPE_RVALUE_REFERENCE);
838  RECORD(TYPE_MEMBER_POINTER);
839  RECORD(TYPE_CONSTANT_ARRAY);
840  RECORD(TYPE_INCOMPLETE_ARRAY);
841  RECORD(TYPE_VARIABLE_ARRAY);
842  RECORD(TYPE_VECTOR);
843  RECORD(TYPE_EXT_VECTOR);
844  RECORD(TYPE_FUNCTION_PROTO);
845  RECORD(TYPE_FUNCTION_NO_PROTO);
846  RECORD(TYPE_TYPEDEF);
847  RECORD(TYPE_TYPEOF_EXPR);
848  RECORD(TYPE_TYPEOF);
849  RECORD(TYPE_RECORD);
850  RECORD(TYPE_ENUM);
851  RECORD(TYPE_OBJC_INTERFACE);
852  RECORD(TYPE_OBJC_OBJECT);
853  RECORD(TYPE_OBJC_OBJECT_POINTER);
854  RECORD(TYPE_DECLTYPE);
855  RECORD(TYPE_ELABORATED);
856  RECORD(TYPE_SUBST_TEMPLATE_TYPE_PARM);
857  RECORD(TYPE_UNRESOLVED_USING);
858  RECORD(TYPE_INJECTED_CLASS_NAME);
859  RECORD(TYPE_OBJC_OBJECT);
860  RECORD(TYPE_TEMPLATE_TYPE_PARM);
861  RECORD(TYPE_TEMPLATE_SPECIALIZATION);
862  RECORD(TYPE_DEPENDENT_NAME);
863  RECORD(TYPE_DEPENDENT_TEMPLATE_SPECIALIZATION);
864  RECORD(TYPE_DEPENDENT_SIZED_ARRAY);
865  RECORD(TYPE_PAREN);
866  RECORD(TYPE_PACK_EXPANSION);
867  RECORD(TYPE_ATTRIBUTED);
868  RECORD(TYPE_SUBST_TEMPLATE_TYPE_PARM_PACK);
869  RECORD(TYPE_ATOMIC);
870  RECORD(DECL_TYPEDEF);
871  RECORD(DECL_ENUM);
872  RECORD(DECL_RECORD);
873  RECORD(DECL_ENUM_CONSTANT);
874  RECORD(DECL_FUNCTION);
875  RECORD(DECL_OBJC_METHOD);
876  RECORD(DECL_OBJC_INTERFACE);
877  RECORD(DECL_OBJC_PROTOCOL);
878  RECORD(DECL_OBJC_IVAR);
879  RECORD(DECL_OBJC_AT_DEFS_FIELD);
880  RECORD(DECL_OBJC_CATEGORY);
881  RECORD(DECL_OBJC_CATEGORY_IMPL);
882  RECORD(DECL_OBJC_IMPLEMENTATION);
883  RECORD(DECL_OBJC_COMPATIBLE_ALIAS);
884  RECORD(DECL_OBJC_PROPERTY);
885  RECORD(DECL_OBJC_PROPERTY_IMPL);
886  RECORD(DECL_FIELD);
887  RECORD(DECL_VAR);
888  RECORD(DECL_IMPLICIT_PARAM);
889  RECORD(DECL_PARM_VAR);
890  RECORD(DECL_FILE_SCOPE_ASM);
891  RECORD(DECL_BLOCK);
892  RECORD(DECL_CONTEXT_LEXICAL);
893  RECORD(DECL_CONTEXT_VISIBLE);
894  RECORD(DECL_NAMESPACE);
895  RECORD(DECL_NAMESPACE_ALIAS);
896  RECORD(DECL_USING);
897  RECORD(DECL_USING_SHADOW);
898  RECORD(DECL_USING_DIRECTIVE);
899  RECORD(DECL_UNRESOLVED_USING_VALUE);
900  RECORD(DECL_UNRESOLVED_USING_TYPENAME);
901  RECORD(DECL_LINKAGE_SPEC);
902  RECORD(DECL_CXX_RECORD);
903  RECORD(DECL_CXX_METHOD);
904  RECORD(DECL_CXX_CONSTRUCTOR);
905  RECORD(DECL_CXX_DESTRUCTOR);
906  RECORD(DECL_CXX_CONVERSION);
907  RECORD(DECL_ACCESS_SPEC);
908  RECORD(DECL_FRIEND);
909  RECORD(DECL_FRIEND_TEMPLATE);
910  RECORD(DECL_CLASS_TEMPLATE);
911  RECORD(DECL_CLASS_TEMPLATE_SPECIALIZATION);
912  RECORD(DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION);
913  RECORD(DECL_FUNCTION_TEMPLATE);
914  RECORD(DECL_TEMPLATE_TYPE_PARM);
915  RECORD(DECL_NON_TYPE_TEMPLATE_PARM);
916  RECORD(DECL_TEMPLATE_TEMPLATE_PARM);
917  RECORD(DECL_STATIC_ASSERT);
918  RECORD(DECL_CXX_BASE_SPECIFIERS);
919  RECORD(DECL_INDIRECTFIELD);
920  RECORD(DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK);
921
922  // Statements and Exprs can occur in the Decls and Types block.
923  AddStmtsExprs(Stream, Record);
924
925  BLOCK(PREPROCESSOR_DETAIL_BLOCK);
926  RECORD(PPD_MACRO_EXPANSION);
927  RECORD(PPD_MACRO_DEFINITION);
928  RECORD(PPD_INCLUSION_DIRECTIVE);
929
930#undef RECORD
931#undef BLOCK
932  Stream.ExitBlock();
933}
934
935/// \brief Adjusts the given filename to only write out the portion of the
936/// filename that is not part of the system root directory.
937///
938/// \param Filename the file name to adjust.
939///
940/// \param isysroot When non-NULL, the PCH file is a relocatable PCH file and
941/// the returned filename will be adjusted by this system root.
942///
943/// \returns either the original filename (if it needs no adjustment) or the
944/// adjusted filename (which points into the @p Filename parameter).
945static const char *
946adjustFilenameForRelocatablePCH(const char *Filename, StringRef isysroot) {
947  assert(Filename && "No file name to adjust?");
948
949  if (isysroot.empty())
950    return Filename;
951
952  // Verify that the filename and the system root have the same prefix.
953  unsigned Pos = 0;
954  for (; Filename[Pos] && Pos < isysroot.size(); ++Pos)
955    if (Filename[Pos] != isysroot[Pos])
956      return Filename; // Prefixes don't match.
957
958  // We hit the end of the filename before we hit the end of the system root.
959  if (!Filename[Pos])
960    return Filename;
961
962  // If the file name has a '/' at the current position, skip over the '/'.
963  // We distinguish sysroot-based includes from absolute includes by the
964  // absence of '/' at the beginning of sysroot-based includes.
965  if (Filename[Pos] == '/')
966    ++Pos;
967
968  return Filename + Pos;
969}
970
971/// \brief Write the AST metadata (e.g., i686-apple-darwin9).
972void ASTWriter::WriteMetadata(ASTContext &Context, StringRef isysroot,
973                              const std::string &OutputFile) {
974  using namespace llvm;
975
976  // Metadata
977  const TargetInfo &Target = Context.getTargetInfo();
978  BitCodeAbbrev *MetaAbbrev = new BitCodeAbbrev();
979  MetaAbbrev->Add(BitCodeAbbrevOp(METADATA));
980  MetaAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // AST major
981  MetaAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // AST minor
982  MetaAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // Clang major
983  MetaAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 16)); // Clang minor
984  MetaAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Relocatable
985  MetaAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Has errors
986  MetaAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Target triple
987  unsigned MetaAbbrevCode = Stream.EmitAbbrev(MetaAbbrev);
988
989  RecordData Record;
990  Record.push_back(METADATA);
991  Record.push_back(VERSION_MAJOR);
992  Record.push_back(VERSION_MINOR);
993  Record.push_back(CLANG_VERSION_MAJOR);
994  Record.push_back(CLANG_VERSION_MINOR);
995  Record.push_back(!isysroot.empty());
996  Record.push_back(ASTHasCompilerErrors);
997  const std::string &Triple = Target.getTriple().getTriple();
998  Stream.EmitRecordWithBlob(MetaAbbrevCode, Record, Triple);
999
1000  if (Chain) {
1001    serialization::ModuleManager &Mgr = Chain->getModuleManager();
1002    llvm::SmallVector<char, 128> ModulePaths;
1003    Record.clear();
1004
1005    for (ModuleManager::ModuleIterator M = Mgr.begin(), MEnd = Mgr.end();
1006         M != MEnd; ++M) {
1007      // Skip modules that weren't directly imported.
1008      if (!(*M)->isDirectlyImported())
1009        continue;
1010
1011      Record.push_back((unsigned)(*M)->Kind); // FIXME: Stable encoding
1012      // FIXME: Write import location, once it matters.
1013      // FIXME: This writes the absolute path for AST files we depend on.
1014      const std::string &FileName = (*M)->FileName;
1015      Record.push_back(FileName.size());
1016      Record.append(FileName.begin(), FileName.end());
1017    }
1018    Stream.EmitRecord(IMPORTS, Record);
1019  }
1020
1021  // Original file name and file ID
1022  SourceManager &SM = Context.getSourceManager();
1023  if (const FileEntry *MainFile = SM.getFileEntryForID(SM.getMainFileID())) {
1024    BitCodeAbbrev *FileAbbrev = new BitCodeAbbrev();
1025    FileAbbrev->Add(BitCodeAbbrevOp(ORIGINAL_FILE_NAME));
1026    FileAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // File name
1027    unsigned FileAbbrevCode = Stream.EmitAbbrev(FileAbbrev);
1028
1029    SmallString<128> MainFilePath(MainFile->getName());
1030
1031    llvm::sys::fs::make_absolute(MainFilePath);
1032
1033    const char *MainFileNameStr = MainFilePath.c_str();
1034    MainFileNameStr = adjustFilenameForRelocatablePCH(MainFileNameStr,
1035                                                      isysroot);
1036    RecordData Record;
1037    Record.push_back(ORIGINAL_FILE_NAME);
1038    Stream.EmitRecordWithBlob(FileAbbrevCode, Record, MainFileNameStr);
1039
1040    Record.clear();
1041    Record.push_back(SM.getMainFileID().getOpaqueValue());
1042    Stream.EmitRecord(ORIGINAL_FILE_ID, Record);
1043  }
1044
1045  // Original PCH directory
1046  if (!OutputFile.empty() && OutputFile != "-") {
1047    BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
1048    Abbrev->Add(BitCodeAbbrevOp(ORIGINAL_PCH_DIR));
1049    Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // File name
1050    unsigned AbbrevCode = Stream.EmitAbbrev(Abbrev);
1051
1052    SmallString<128> OutputPath(OutputFile);
1053
1054    llvm::sys::fs::make_absolute(OutputPath);
1055    StringRef origDir = llvm::sys::path::parent_path(OutputPath);
1056
1057    RecordData Record;
1058    Record.push_back(ORIGINAL_PCH_DIR);
1059    Stream.EmitRecordWithBlob(AbbrevCode, Record, origDir);
1060  }
1061
1062  // Repository branch/version information.
1063  BitCodeAbbrev *RepoAbbrev = new BitCodeAbbrev();
1064  RepoAbbrev->Add(BitCodeAbbrevOp(VERSION_CONTROL_BRANCH_REVISION));
1065  RepoAbbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // SVN branch/tag
1066  unsigned RepoAbbrevCode = Stream.EmitAbbrev(RepoAbbrev);
1067  Record.clear();
1068  Record.push_back(VERSION_CONTROL_BRANCH_REVISION);
1069  Stream.EmitRecordWithBlob(RepoAbbrevCode, Record,
1070                            getClangFullRepositoryVersion());
1071}
1072
1073/// \brief Write the LangOptions structure.
1074void ASTWriter::WriteLanguageOptions(const LangOptions &LangOpts) {
1075  RecordData Record;
1076#define LANGOPT(Name, Bits, Default, Description) \
1077  Record.push_back(LangOpts.Name);
1078#define ENUM_LANGOPT(Name, Type, Bits, Default, Description) \
1079  Record.push_back(static_cast<unsigned>(LangOpts.get##Name()));
1080#include "clang/Basic/LangOptions.def"
1081
1082  Record.push_back(LangOpts.CurrentModule.size());
1083  Record.append(LangOpts.CurrentModule.begin(), LangOpts.CurrentModule.end());
1084  Stream.EmitRecord(LANGUAGE_OPTIONS, Record);
1085}
1086
1087//===----------------------------------------------------------------------===//
1088// stat cache Serialization
1089//===----------------------------------------------------------------------===//
1090
1091namespace {
1092// Trait used for the on-disk hash table of stat cache results.
1093class ASTStatCacheTrait {
1094public:
1095  typedef const char * key_type;
1096  typedef key_type key_type_ref;
1097
1098  typedef struct stat data_type;
1099  typedef const data_type &data_type_ref;
1100
1101  static unsigned ComputeHash(const char *path) {
1102    return llvm::HashString(path);
1103  }
1104
1105  std::pair<unsigned,unsigned>
1106    EmitKeyDataLength(raw_ostream& Out, const char *path,
1107                      data_type_ref Data) {
1108    unsigned StrLen = strlen(path);
1109    clang::io::Emit16(Out, StrLen);
1110    unsigned DataLen = 4 + 4 + 2 + 8 + 8;
1111    clang::io::Emit8(Out, DataLen);
1112    return std::make_pair(StrLen + 1, DataLen);
1113  }
1114
1115  void EmitKey(raw_ostream& Out, const char *path, unsigned KeyLen) {
1116    Out.write(path, KeyLen);
1117  }
1118
1119  void EmitData(raw_ostream &Out, key_type_ref,
1120                data_type_ref Data, unsigned DataLen) {
1121    using namespace clang::io;
1122    uint64_t Start = Out.tell(); (void)Start;
1123
1124    Emit32(Out, (uint32_t) Data.st_ino);
1125    Emit32(Out, (uint32_t) Data.st_dev);
1126    Emit16(Out, (uint16_t) Data.st_mode);
1127    Emit64(Out, (uint64_t) Data.st_mtime);
1128    Emit64(Out, (uint64_t) Data.st_size);
1129
1130    assert(Out.tell() - Start == DataLen && "Wrong data length");
1131  }
1132};
1133} // end anonymous namespace
1134
1135/// \brief Write the stat() system call cache to the AST file.
1136void ASTWriter::WriteStatCache(MemorizeStatCalls &StatCalls) {
1137  // Build the on-disk hash table containing information about every
1138  // stat() call.
1139  OnDiskChainedHashTableGenerator<ASTStatCacheTrait> Generator;
1140  unsigned NumStatEntries = 0;
1141  for (MemorizeStatCalls::iterator Stat = StatCalls.begin(),
1142                                StatEnd = StatCalls.end();
1143       Stat != StatEnd; ++Stat, ++NumStatEntries) {
1144    StringRef Filename = Stat->first();
1145    Generator.insert(Filename.data(), Stat->second);
1146  }
1147
1148  // Create the on-disk hash table in a buffer.
1149  SmallString<4096> StatCacheData;
1150  uint32_t BucketOffset;
1151  {
1152    llvm::raw_svector_ostream Out(StatCacheData);
1153    // Make sure that no bucket is at offset 0
1154    clang::io::Emit32(Out, 0);
1155    BucketOffset = Generator.Emit(Out);
1156  }
1157
1158  // Create a blob abbreviation
1159  using namespace llvm;
1160  BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
1161  Abbrev->Add(BitCodeAbbrevOp(STAT_CACHE));
1162  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1163  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1164  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1165  unsigned StatCacheAbbrev = Stream.EmitAbbrev(Abbrev);
1166
1167  // Write the stat cache
1168  RecordData Record;
1169  Record.push_back(STAT_CACHE);
1170  Record.push_back(BucketOffset);
1171  Record.push_back(NumStatEntries);
1172  Stream.EmitRecordWithBlob(StatCacheAbbrev, Record, StatCacheData.str());
1173}
1174
1175//===----------------------------------------------------------------------===//
1176// Source Manager Serialization
1177//===----------------------------------------------------------------------===//
1178
1179/// \brief Create an abbreviation for the SLocEntry that refers to a
1180/// file.
1181static unsigned CreateSLocFileAbbrev(llvm::BitstreamWriter &Stream) {
1182  using namespace llvm;
1183  BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
1184  Abbrev->Add(BitCodeAbbrevOp(SM_SLOC_FILE_ENTRY));
1185  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Offset
1186  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Include location
1187  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // Characteristic
1188  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Line directives
1189  // FileEntry fields.
1190  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 12)); // Size
1191  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 32)); // Modification time
1192  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // BufferOverridden
1193  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // NumCreatedFIDs
1194  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 24)); // FirstDeclIndex
1195  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // NumDecls
1196  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // File name
1197  return Stream.EmitAbbrev(Abbrev);
1198}
1199
1200/// \brief Create an abbreviation for the SLocEntry that refers to a
1201/// buffer.
1202static unsigned CreateSLocBufferAbbrev(llvm::BitstreamWriter &Stream) {
1203  using namespace llvm;
1204  BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
1205  Abbrev->Add(BitCodeAbbrevOp(SM_SLOC_BUFFER_ENTRY));
1206  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Offset
1207  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Include location
1208  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // Characteristic
1209  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Line directives
1210  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Buffer name blob
1211  return Stream.EmitAbbrev(Abbrev);
1212}
1213
1214/// \brief Create an abbreviation for the SLocEntry that refers to a
1215/// buffer's blob.
1216static unsigned CreateSLocBufferBlobAbbrev(llvm::BitstreamWriter &Stream) {
1217  using namespace llvm;
1218  BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
1219  Abbrev->Add(BitCodeAbbrevOp(SM_SLOC_BUFFER_BLOB));
1220  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Blob
1221  return Stream.EmitAbbrev(Abbrev);
1222}
1223
1224/// \brief Create an abbreviation for the SLocEntry that refers to a macro
1225/// expansion.
1226static unsigned CreateSLocExpansionAbbrev(llvm::BitstreamWriter &Stream) {
1227  using namespace llvm;
1228  BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
1229  Abbrev->Add(BitCodeAbbrevOp(SM_SLOC_EXPANSION_ENTRY));
1230  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Offset
1231  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Spelling location
1232  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // Start location
1233  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // End location
1234  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Token length
1235  return Stream.EmitAbbrev(Abbrev);
1236}
1237
1238namespace {
1239  // Trait used for the on-disk hash table of header search information.
1240  class HeaderFileInfoTrait {
1241    ASTWriter &Writer;
1242    const HeaderSearch &HS;
1243
1244    // Keep track of the framework names we've used during serialization.
1245    SmallVector<char, 128> FrameworkStringData;
1246    llvm::StringMap<unsigned> FrameworkNameOffset;
1247
1248  public:
1249    HeaderFileInfoTrait(ASTWriter &Writer, const HeaderSearch &HS)
1250      : Writer(Writer), HS(HS) { }
1251
1252    typedef const char *key_type;
1253    typedef key_type key_type_ref;
1254
1255    typedef HeaderFileInfo data_type;
1256    typedef const data_type &data_type_ref;
1257
1258    static unsigned ComputeHash(const char *path) {
1259      // The hash is based only on the filename portion of the key, so that the
1260      // reader can match based on filenames when symlinking or excess path
1261      // elements ("foo/../", "../") change the form of the name. However,
1262      // complete path is still the key.
1263      return llvm::HashString(llvm::sys::path::filename(path));
1264    }
1265
1266    std::pair<unsigned,unsigned>
1267    EmitKeyDataLength(raw_ostream& Out, const char *path,
1268                      data_type_ref Data) {
1269      unsigned StrLen = strlen(path);
1270      clang::io::Emit16(Out, StrLen);
1271      unsigned DataLen = 1 + 2 + 4 + 4;
1272      clang::io::Emit8(Out, DataLen);
1273      return std::make_pair(StrLen + 1, DataLen);
1274    }
1275
1276    void EmitKey(raw_ostream& Out, const char *path, unsigned KeyLen) {
1277      Out.write(path, KeyLen);
1278    }
1279
1280    void EmitData(raw_ostream &Out, key_type_ref,
1281                  data_type_ref Data, unsigned DataLen) {
1282      using namespace clang::io;
1283      uint64_t Start = Out.tell(); (void)Start;
1284
1285      unsigned char Flags = (Data.isImport << 5)
1286                          | (Data.isPragmaOnce << 4)
1287                          | (Data.DirInfo << 2)
1288                          | (Data.Resolved << 1)
1289                          | Data.IndexHeaderMapHeader;
1290      Emit8(Out, (uint8_t)Flags);
1291      Emit16(Out, (uint16_t) Data.NumIncludes);
1292
1293      if (!Data.ControllingMacro)
1294        Emit32(Out, (uint32_t)Data.ControllingMacroID);
1295      else
1296        Emit32(Out, (uint32_t)Writer.getIdentifierRef(Data.ControllingMacro));
1297
1298      unsigned Offset = 0;
1299      if (!Data.Framework.empty()) {
1300        // If this header refers into a framework, save the framework name.
1301        llvm::StringMap<unsigned>::iterator Pos
1302          = FrameworkNameOffset.find(Data.Framework);
1303        if (Pos == FrameworkNameOffset.end()) {
1304          Offset = FrameworkStringData.size() + 1;
1305          FrameworkStringData.append(Data.Framework.begin(),
1306                                     Data.Framework.end());
1307          FrameworkStringData.push_back(0);
1308
1309          FrameworkNameOffset[Data.Framework] = Offset;
1310        } else
1311          Offset = Pos->second;
1312      }
1313      Emit32(Out, Offset);
1314
1315      assert(Out.tell() - Start == DataLen && "Wrong data length");
1316    }
1317
1318    const char *strings_begin() const { return FrameworkStringData.begin(); }
1319    const char *strings_end() const { return FrameworkStringData.end(); }
1320  };
1321} // end anonymous namespace
1322
1323/// \brief Write the header search block for the list of files that
1324///
1325/// \param HS The header search structure to save.
1326///
1327/// \param Chain Whether we're creating a chained AST file.
1328void ASTWriter::WriteHeaderSearch(const HeaderSearch &HS, StringRef isysroot) {
1329  SmallVector<const FileEntry *, 16> FilesByUID;
1330  HS.getFileMgr().GetUniqueIDMapping(FilesByUID);
1331
1332  if (FilesByUID.size() > HS.header_file_size())
1333    FilesByUID.resize(HS.header_file_size());
1334
1335  HeaderFileInfoTrait GeneratorTrait(*this, HS);
1336  OnDiskChainedHashTableGenerator<HeaderFileInfoTrait> Generator;
1337  SmallVector<const char *, 4> SavedStrings;
1338  unsigned NumHeaderSearchEntries = 0;
1339  for (unsigned UID = 0, LastUID = FilesByUID.size(); UID != LastUID; ++UID) {
1340    const FileEntry *File = FilesByUID[UID];
1341    if (!File)
1342      continue;
1343
1344    // Use HeaderSearch's getFileInfo to make sure we get the HeaderFileInfo
1345    // from the external source if it was not provided already.
1346    const HeaderFileInfo &HFI = HS.getFileInfo(File);
1347    if (HFI.External && Chain)
1348      continue;
1349
1350    // Turn the file name into an absolute path, if it isn't already.
1351    const char *Filename = File->getName();
1352    Filename = adjustFilenameForRelocatablePCH(Filename, isysroot);
1353
1354    // If we performed any translation on the file name at all, we need to
1355    // save this string, since the generator will refer to it later.
1356    if (Filename != File->getName()) {
1357      Filename = strdup(Filename);
1358      SavedStrings.push_back(Filename);
1359    }
1360
1361    Generator.insert(Filename, HFI, GeneratorTrait);
1362    ++NumHeaderSearchEntries;
1363  }
1364
1365  // Create the on-disk hash table in a buffer.
1366  SmallString<4096> TableData;
1367  uint32_t BucketOffset;
1368  {
1369    llvm::raw_svector_ostream Out(TableData);
1370    // Make sure that no bucket is at offset 0
1371    clang::io::Emit32(Out, 0);
1372    BucketOffset = Generator.Emit(Out, GeneratorTrait);
1373  }
1374
1375  // Create a blob abbreviation
1376  using namespace llvm;
1377  BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
1378  Abbrev->Add(BitCodeAbbrevOp(HEADER_SEARCH_TABLE));
1379  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1380  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1381  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1382  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1383  unsigned TableAbbrev = Stream.EmitAbbrev(Abbrev);
1384
1385  // Write the header search table
1386  RecordData Record;
1387  Record.push_back(HEADER_SEARCH_TABLE);
1388  Record.push_back(BucketOffset);
1389  Record.push_back(NumHeaderSearchEntries);
1390  Record.push_back(TableData.size());
1391  TableData.append(GeneratorTrait.strings_begin(),GeneratorTrait.strings_end());
1392  Stream.EmitRecordWithBlob(TableAbbrev, Record, TableData.str());
1393
1394  // Free all of the strings we had to duplicate.
1395  for (unsigned I = 0, N = SavedStrings.size(); I != N; ++I)
1396    free((void*)SavedStrings[I]);
1397}
1398
1399/// \brief Writes the block containing the serialized form of the
1400/// source manager.
1401///
1402/// TODO: We should probably use an on-disk hash table (stored in a
1403/// blob), indexed based on the file name, so that we only create
1404/// entries for files that we actually need. In the common case (no
1405/// errors), we probably won't have to create file entries for any of
1406/// the files in the AST.
1407void ASTWriter::WriteSourceManagerBlock(SourceManager &SourceMgr,
1408                                        const Preprocessor &PP,
1409                                        StringRef isysroot) {
1410  RecordData Record;
1411
1412  // Enter the source manager block.
1413  Stream.EnterSubblock(SOURCE_MANAGER_BLOCK_ID, 3);
1414
1415  // Abbreviations for the various kinds of source-location entries.
1416  unsigned SLocFileAbbrv = CreateSLocFileAbbrev(Stream);
1417  unsigned SLocBufferAbbrv = CreateSLocBufferAbbrev(Stream);
1418  unsigned SLocBufferBlobAbbrv = CreateSLocBufferBlobAbbrev(Stream);
1419  unsigned SLocExpansionAbbrv = CreateSLocExpansionAbbrev(Stream);
1420
1421  // Write out the source location entry table. We skip the first
1422  // entry, which is always the same dummy entry.
1423  std::vector<uint32_t> SLocEntryOffsets;
1424  // Write out the offsets of only source location file entries.
1425  // We will go through them in ASTReader::validateFileEntries().
1426  std::vector<uint32_t> SLocFileEntryOffsets;
1427  RecordData PreloadSLocs;
1428  SLocEntryOffsets.reserve(SourceMgr.local_sloc_entry_size() - 1);
1429  for (unsigned I = 1, N = SourceMgr.local_sloc_entry_size();
1430       I != N; ++I) {
1431    // Get this source location entry.
1432    const SrcMgr::SLocEntry *SLoc = &SourceMgr.getLocalSLocEntry(I);
1433
1434    // Record the offset of this source-location entry.
1435    SLocEntryOffsets.push_back(Stream.GetCurrentBitNo());
1436
1437    // Figure out which record code to use.
1438    unsigned Code;
1439    if (SLoc->isFile()) {
1440      const SrcMgr::ContentCache *Cache = SLoc->getFile().getContentCache();
1441      if (Cache->OrigEntry) {
1442        Code = SM_SLOC_FILE_ENTRY;
1443        SLocFileEntryOffsets.push_back(Stream.GetCurrentBitNo());
1444      } else
1445        Code = SM_SLOC_BUFFER_ENTRY;
1446    } else
1447      Code = SM_SLOC_EXPANSION_ENTRY;
1448    Record.clear();
1449    Record.push_back(Code);
1450
1451    // Starting offset of this entry within this module, so skip the dummy.
1452    Record.push_back(SLoc->getOffset() - 2);
1453    if (SLoc->isFile()) {
1454      const SrcMgr::FileInfo &File = SLoc->getFile();
1455      Record.push_back(File.getIncludeLoc().getRawEncoding());
1456      Record.push_back(File.getFileCharacteristic()); // FIXME: stable encoding
1457      Record.push_back(File.hasLineDirectives());
1458
1459      const SrcMgr::ContentCache *Content = File.getContentCache();
1460      if (Content->OrigEntry) {
1461        assert(Content->OrigEntry == Content->ContentsEntry &&
1462               "Writing to AST an overridden file is not supported");
1463
1464        // The source location entry is a file. The blob associated
1465        // with this entry is the file name.
1466
1467        // Emit size/modification time for this file.
1468        Record.push_back(Content->OrigEntry->getSize());
1469        Record.push_back(Content->OrigEntry->getModificationTime());
1470        Record.push_back(Content->BufferOverridden);
1471        Record.push_back(File.NumCreatedFIDs);
1472
1473        FileDeclIDsTy::iterator FDI = FileDeclIDs.find(SLoc);
1474        if (FDI != FileDeclIDs.end()) {
1475          Record.push_back(FDI->second->FirstDeclIndex);
1476          Record.push_back(FDI->second->DeclIDs.size());
1477        } else {
1478          Record.push_back(0);
1479          Record.push_back(0);
1480        }
1481
1482        // Turn the file name into an absolute path, if it isn't already.
1483        const char *Filename = Content->OrigEntry->getName();
1484        SmallString<128> FilePath(Filename);
1485
1486        // Ask the file manager to fixup the relative path for us. This will
1487        // honor the working directory.
1488        SourceMgr.getFileManager().FixupRelativePath(FilePath);
1489
1490        // FIXME: This call to make_absolute shouldn't be necessary, the
1491        // call to FixupRelativePath should always return an absolute path.
1492        llvm::sys::fs::make_absolute(FilePath);
1493        Filename = FilePath.c_str();
1494
1495        Filename = adjustFilenameForRelocatablePCH(Filename, isysroot);
1496        Stream.EmitRecordWithBlob(SLocFileAbbrv, Record, Filename);
1497
1498        if (Content->BufferOverridden) {
1499          Record.clear();
1500          Record.push_back(SM_SLOC_BUFFER_BLOB);
1501          const llvm::MemoryBuffer *Buffer
1502            = Content->getBuffer(PP.getDiagnostics(), PP.getSourceManager());
1503          Stream.EmitRecordWithBlob(SLocBufferBlobAbbrv, Record,
1504                                    StringRef(Buffer->getBufferStart(),
1505                                              Buffer->getBufferSize() + 1));
1506        }
1507      } else {
1508        // The source location entry is a buffer. The blob associated
1509        // with this entry contains the contents of the buffer.
1510
1511        // We add one to the size so that we capture the trailing NULL
1512        // that is required by llvm::MemoryBuffer::getMemBuffer (on
1513        // the reader side).
1514        const llvm::MemoryBuffer *Buffer
1515          = Content->getBuffer(PP.getDiagnostics(), PP.getSourceManager());
1516        const char *Name = Buffer->getBufferIdentifier();
1517        Stream.EmitRecordWithBlob(SLocBufferAbbrv, Record,
1518                                  StringRef(Name, strlen(Name) + 1));
1519        Record.clear();
1520        Record.push_back(SM_SLOC_BUFFER_BLOB);
1521        Stream.EmitRecordWithBlob(SLocBufferBlobAbbrv, Record,
1522                                  StringRef(Buffer->getBufferStart(),
1523                                                  Buffer->getBufferSize() + 1));
1524
1525        if (strcmp(Name, "<built-in>") == 0) {
1526          PreloadSLocs.push_back(SLocEntryOffsets.size());
1527        }
1528      }
1529    } else {
1530      // The source location entry is a macro expansion.
1531      const SrcMgr::ExpansionInfo &Expansion = SLoc->getExpansion();
1532      Record.push_back(Expansion.getSpellingLoc().getRawEncoding());
1533      Record.push_back(Expansion.getExpansionLocStart().getRawEncoding());
1534      Record.push_back(Expansion.isMacroArgExpansion() ? 0
1535                             : Expansion.getExpansionLocEnd().getRawEncoding());
1536
1537      // Compute the token length for this macro expansion.
1538      unsigned NextOffset = SourceMgr.getNextLocalOffset();
1539      if (I + 1 != N)
1540        NextOffset = SourceMgr.getLocalSLocEntry(I + 1).getOffset();
1541      Record.push_back(NextOffset - SLoc->getOffset() - 1);
1542      Stream.EmitRecordWithAbbrev(SLocExpansionAbbrv, Record);
1543    }
1544  }
1545
1546  Stream.ExitBlock();
1547
1548  if (SLocEntryOffsets.empty())
1549    return;
1550
1551  // Write the source-location offsets table into the AST block. This
1552  // table is used for lazily loading source-location information.
1553  using namespace llvm;
1554  BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
1555  Abbrev->Add(BitCodeAbbrevOp(SOURCE_LOCATION_OFFSETS));
1556  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 16)); // # of slocs
1557  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 16)); // total size
1558  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // offsets
1559  unsigned SLocOffsetsAbbrev = Stream.EmitAbbrev(Abbrev);
1560
1561  Record.clear();
1562  Record.push_back(SOURCE_LOCATION_OFFSETS);
1563  Record.push_back(SLocEntryOffsets.size());
1564  Record.push_back(SourceMgr.getNextLocalOffset() - 1); // skip dummy
1565  Stream.EmitRecordWithBlob(SLocOffsetsAbbrev, Record, data(SLocEntryOffsets));
1566
1567  Abbrev = new BitCodeAbbrev();
1568  Abbrev->Add(BitCodeAbbrevOp(FILE_SOURCE_LOCATION_OFFSETS));
1569  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 16)); // # of slocs
1570  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // offsets
1571  unsigned SLocFileOffsetsAbbrev = Stream.EmitAbbrev(Abbrev);
1572
1573  Record.clear();
1574  Record.push_back(FILE_SOURCE_LOCATION_OFFSETS);
1575  Record.push_back(SLocFileEntryOffsets.size());
1576  Stream.EmitRecordWithBlob(SLocFileOffsetsAbbrev, Record,
1577                            data(SLocFileEntryOffsets));
1578
1579  // Write the source location entry preloads array, telling the AST
1580  // reader which source locations entries it should load eagerly.
1581  Stream.EmitRecord(SOURCE_LOCATION_PRELOADS, PreloadSLocs);
1582
1583  // Write the line table. It depends on remapping working, so it must come
1584  // after the source location offsets.
1585  if (SourceMgr.hasLineTable()) {
1586    LineTableInfo &LineTable = SourceMgr.getLineTable();
1587
1588    Record.clear();
1589    // Emit the file names
1590    Record.push_back(LineTable.getNumFilenames());
1591    for (unsigned I = 0, N = LineTable.getNumFilenames(); I != N; ++I) {
1592      // Emit the file name
1593      const char *Filename = LineTable.getFilename(I);
1594      Filename = adjustFilenameForRelocatablePCH(Filename, isysroot);
1595      unsigned FilenameLen = Filename? strlen(Filename) : 0;
1596      Record.push_back(FilenameLen);
1597      if (FilenameLen)
1598        Record.insert(Record.end(), Filename, Filename + FilenameLen);
1599    }
1600
1601    // Emit the line entries
1602    for (LineTableInfo::iterator L = LineTable.begin(), LEnd = LineTable.end();
1603         L != LEnd; ++L) {
1604      // Only emit entries for local files.
1605      if (L->first < 0)
1606        continue;
1607
1608      // Emit the file ID
1609      Record.push_back(L->first);
1610
1611      // Emit the line entries
1612      Record.push_back(L->second.size());
1613      for (std::vector<LineEntry>::iterator LE = L->second.begin(),
1614                                         LEEnd = L->second.end();
1615           LE != LEEnd; ++LE) {
1616        Record.push_back(LE->FileOffset);
1617        Record.push_back(LE->LineNo);
1618        Record.push_back(LE->FilenameID);
1619        Record.push_back((unsigned)LE->FileKind);
1620        Record.push_back(LE->IncludeOffset);
1621      }
1622    }
1623    Stream.EmitRecord(SOURCE_MANAGER_LINE_TABLE, Record);
1624  }
1625}
1626
1627//===----------------------------------------------------------------------===//
1628// Preprocessor Serialization
1629//===----------------------------------------------------------------------===//
1630
1631static int compareMacroDefinitions(const void *XPtr, const void *YPtr) {
1632  const std::pair<const IdentifierInfo *, MacroInfo *> &X =
1633    *(const std::pair<const IdentifierInfo *, MacroInfo *>*)XPtr;
1634  const std::pair<const IdentifierInfo *, MacroInfo *> &Y =
1635    *(const std::pair<const IdentifierInfo *, MacroInfo *>*)YPtr;
1636  return X.first->getName().compare(Y.first->getName());
1637}
1638
1639/// \brief Writes the block containing the serialized form of the
1640/// preprocessor.
1641///
1642void ASTWriter::WritePreprocessor(const Preprocessor &PP, bool IsModule) {
1643  PreprocessingRecord *PPRec = PP.getPreprocessingRecord();
1644  if (PPRec)
1645    WritePreprocessorDetail(*PPRec);
1646
1647  RecordData Record;
1648
1649  // If the preprocessor __COUNTER__ value has been bumped, remember it.
1650  if (PP.getCounterValue() != 0) {
1651    Record.push_back(PP.getCounterValue());
1652    Stream.EmitRecord(PP_COUNTER_VALUE, Record);
1653    Record.clear();
1654  }
1655
1656  // Enter the preprocessor block.
1657  Stream.EnterSubblock(PREPROCESSOR_BLOCK_ID, 3);
1658
1659  // If the AST file contains __DATE__ or __TIME__ emit a warning about this.
1660  // FIXME: use diagnostics subsystem for localization etc.
1661  if (PP.SawDateOrTime())
1662    fprintf(stderr, "warning: precompiled header used __DATE__ or __TIME__.\n");
1663
1664
1665  // Loop over all the macro definitions that are live at the end of the file,
1666  // emitting each to the PP section.
1667
1668  // Construct the list of macro definitions that need to be serialized.
1669  SmallVector<std::pair<const IdentifierInfo *, MacroInfo *>, 2>
1670    MacrosToEmit;
1671  llvm::SmallPtrSet<const IdentifierInfo*, 4> MacroDefinitionsSeen;
1672  for (Preprocessor::macro_iterator I = PP.macro_begin(Chain == 0),
1673                                    E = PP.macro_end(Chain == 0);
1674       I != E; ++I) {
1675    const IdentifierInfo *Name = I->first;
1676    if (!IsModule || I->second->isPublic()) {
1677      MacroDefinitionsSeen.insert(Name);
1678      MacrosToEmit.push_back(std::make_pair(I->first, I->second));
1679    }
1680  }
1681
1682  // Sort the set of macro definitions that need to be serialized by the
1683  // name of the macro, to provide a stable ordering.
1684  llvm::array_pod_sort(MacrosToEmit.begin(), MacrosToEmit.end(),
1685                       &compareMacroDefinitions);
1686
1687  // Resolve any identifiers that defined macros at the time they were
1688  // deserialized, adding them to the list of macros to emit (if appropriate).
1689  for (unsigned I = 0, N = DeserializedMacroNames.size(); I != N; ++I) {
1690    IdentifierInfo *Name
1691      = const_cast<IdentifierInfo *>(DeserializedMacroNames[I]);
1692    if (Name->hasMacroDefinition() && MacroDefinitionsSeen.insert(Name))
1693      MacrosToEmit.push_back(std::make_pair(Name, PP.getMacroInfo(Name)));
1694  }
1695
1696  for (unsigned I = 0, N = MacrosToEmit.size(); I != N; ++I) {
1697    const IdentifierInfo *Name = MacrosToEmit[I].first;
1698    MacroInfo *MI = MacrosToEmit[I].second;
1699    if (!MI)
1700      continue;
1701
1702    // Don't emit builtin macros like __LINE__ to the AST file unless they have
1703    // been redefined by the header (in which case they are not isBuiltinMacro).
1704    // Also skip macros from a AST file if we're chaining.
1705
1706    // FIXME: There is a (probably minor) optimization we could do here, if
1707    // the macro comes from the original PCH but the identifier comes from a
1708    // chained PCH, by storing the offset into the original PCH rather than
1709    // writing the macro definition a second time.
1710    if (MI->isBuiltinMacro() ||
1711        (Chain &&
1712         Name->isFromAST() && !Name->hasChangedSinceDeserialization() &&
1713         MI->isFromAST() && !MI->hasChangedAfterLoad()))
1714      continue;
1715
1716    AddIdentifierRef(Name, Record);
1717    MacroOffsets[Name] = Stream.GetCurrentBitNo();
1718    Record.push_back(MI->getDefinitionLoc().getRawEncoding());
1719    Record.push_back(MI->isUsed());
1720    Record.push_back(MI->isPublic());
1721    AddSourceLocation(MI->getVisibilityLocation(), Record);
1722    unsigned Code;
1723    if (MI->isObjectLike()) {
1724      Code = PP_MACRO_OBJECT_LIKE;
1725    } else {
1726      Code = PP_MACRO_FUNCTION_LIKE;
1727
1728      Record.push_back(MI->isC99Varargs());
1729      Record.push_back(MI->isGNUVarargs());
1730      Record.push_back(MI->getNumArgs());
1731      for (MacroInfo::arg_iterator I = MI->arg_begin(), E = MI->arg_end();
1732           I != E; ++I)
1733        AddIdentifierRef(*I, Record);
1734    }
1735
1736    // If we have a detailed preprocessing record, record the macro definition
1737    // ID that corresponds to this macro.
1738    if (PPRec)
1739      Record.push_back(MacroDefinitions[PPRec->findMacroDefinition(MI)]);
1740
1741    Stream.EmitRecord(Code, Record);
1742    Record.clear();
1743
1744    // Emit the tokens array.
1745    for (unsigned TokNo = 0, e = MI->getNumTokens(); TokNo != e; ++TokNo) {
1746      // Note that we know that the preprocessor does not have any annotation
1747      // tokens in it because they are created by the parser, and thus can't be
1748      // in a macro definition.
1749      const Token &Tok = MI->getReplacementToken(TokNo);
1750
1751      Record.push_back(Tok.getLocation().getRawEncoding());
1752      Record.push_back(Tok.getLength());
1753
1754      // FIXME: When reading literal tokens, reconstruct the literal pointer if
1755      // it is needed.
1756      AddIdentifierRef(Tok.getIdentifierInfo(), Record);
1757      // FIXME: Should translate token kind to a stable encoding.
1758      Record.push_back(Tok.getKind());
1759      // FIXME: Should translate token flags to a stable encoding.
1760      Record.push_back(Tok.getFlags());
1761
1762      Stream.EmitRecord(PP_TOKEN, Record);
1763      Record.clear();
1764    }
1765    ++NumMacros;
1766  }
1767  Stream.ExitBlock();
1768}
1769
1770void ASTWriter::WritePreprocessorDetail(PreprocessingRecord &PPRec) {
1771  if (PPRec.local_begin() == PPRec.local_end())
1772    return;
1773
1774  SmallVector<PPEntityOffset, 64> PreprocessedEntityOffsets;
1775
1776  // Enter the preprocessor block.
1777  Stream.EnterSubblock(PREPROCESSOR_DETAIL_BLOCK_ID, 3);
1778
1779  // If the preprocessor has a preprocessing record, emit it.
1780  unsigned NumPreprocessingRecords = 0;
1781  using namespace llvm;
1782
1783  // Set up the abbreviation for
1784  unsigned InclusionAbbrev = 0;
1785  {
1786    BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
1787    Abbrev->Add(BitCodeAbbrevOp(PPD_INCLUSION_DIRECTIVE));
1788    Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // filename length
1789    Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // in quotes
1790    Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // kind
1791    Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1792    InclusionAbbrev = Stream.EmitAbbrev(Abbrev);
1793  }
1794
1795  unsigned FirstPreprocessorEntityID
1796    = (Chain ? PPRec.getNumLoadedPreprocessedEntities() : 0)
1797    + NUM_PREDEF_PP_ENTITY_IDS;
1798  unsigned NextPreprocessorEntityID = FirstPreprocessorEntityID;
1799  RecordData Record;
1800  for (PreprocessingRecord::iterator E = PPRec.local_begin(),
1801                                  EEnd = PPRec.local_end();
1802       E != EEnd;
1803       (void)++E, ++NumPreprocessingRecords, ++NextPreprocessorEntityID) {
1804    Record.clear();
1805
1806    PreprocessedEntityOffsets.push_back(PPEntityOffset((*E)->getSourceRange(),
1807                                                     Stream.GetCurrentBitNo()));
1808
1809    if (MacroDefinition *MD = dyn_cast<MacroDefinition>(*E)) {
1810      // Record this macro definition's ID.
1811      MacroDefinitions[MD] = NextPreprocessorEntityID;
1812
1813      AddIdentifierRef(MD->getName(), Record);
1814      Stream.EmitRecord(PPD_MACRO_DEFINITION, Record);
1815      continue;
1816    }
1817
1818    if (MacroExpansion *ME = dyn_cast<MacroExpansion>(*E)) {
1819      Record.push_back(ME->isBuiltinMacro());
1820      if (ME->isBuiltinMacro())
1821        AddIdentifierRef(ME->getName(), Record);
1822      else
1823        Record.push_back(MacroDefinitions[ME->getDefinition()]);
1824      Stream.EmitRecord(PPD_MACRO_EXPANSION, Record);
1825      continue;
1826    }
1827
1828    if (InclusionDirective *ID = dyn_cast<InclusionDirective>(*E)) {
1829      Record.push_back(PPD_INCLUSION_DIRECTIVE);
1830      Record.push_back(ID->getFileName().size());
1831      Record.push_back(ID->wasInQuotes());
1832      Record.push_back(static_cast<unsigned>(ID->getKind()));
1833      SmallString<64> Buffer;
1834      Buffer += ID->getFileName();
1835      // Check that the FileEntry is not null because it was not resolved and
1836      // we create a PCH even with compiler errors.
1837      if (ID->getFile())
1838        Buffer += ID->getFile()->getName();
1839      Stream.EmitRecordWithBlob(InclusionAbbrev, Record, Buffer);
1840      continue;
1841    }
1842
1843    llvm_unreachable("Unhandled PreprocessedEntity in ASTWriter");
1844  }
1845  Stream.ExitBlock();
1846
1847  // Write the offsets table for the preprocessing record.
1848  if (NumPreprocessingRecords > 0) {
1849    assert(PreprocessedEntityOffsets.size() == NumPreprocessingRecords);
1850
1851    // Write the offsets table for identifier IDs.
1852    using namespace llvm;
1853    BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
1854    Abbrev->Add(BitCodeAbbrevOp(PPD_ENTITIES_OFFSETS));
1855    Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // first pp entity
1856    Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1857    unsigned PPEOffsetAbbrev = Stream.EmitAbbrev(Abbrev);
1858
1859    Record.clear();
1860    Record.push_back(PPD_ENTITIES_OFFSETS);
1861    Record.push_back(FirstPreprocessorEntityID - NUM_PREDEF_PP_ENTITY_IDS);
1862    Stream.EmitRecordWithBlob(PPEOffsetAbbrev, Record,
1863                              data(PreprocessedEntityOffsets));
1864  }
1865}
1866
1867unsigned ASTWriter::getSubmoduleID(Module *Mod) {
1868  llvm::DenseMap<Module *, unsigned>::iterator Known = SubmoduleIDs.find(Mod);
1869  if (Known != SubmoduleIDs.end())
1870    return Known->second;
1871
1872  return SubmoduleIDs[Mod] = NextSubmoduleID++;
1873}
1874
1875/// \brief Compute the number of modules within the given tree (including the
1876/// given module).
1877static unsigned getNumberOfModules(Module *Mod) {
1878  unsigned ChildModules = 0;
1879  for (Module::submodule_iterator Sub = Mod->submodule_begin(),
1880                               SubEnd = Mod->submodule_end();
1881       Sub != SubEnd; ++Sub)
1882    ChildModules += getNumberOfModules(*Sub);
1883
1884  return ChildModules + 1;
1885}
1886
1887void ASTWriter::WriteSubmodules(Module *WritingModule) {
1888  // Determine the dependencies of our module and each of it's submodules.
1889  // FIXME: This feels like it belongs somewhere else, but there are no
1890  // other consumers of this information.
1891  SourceManager &SrcMgr = PP->getSourceManager();
1892  ModuleMap &ModMap = PP->getHeaderSearchInfo().getModuleMap();
1893  for (ASTContext::import_iterator I = Context->local_import_begin(),
1894                                IEnd = Context->local_import_end();
1895       I != IEnd; ++I) {
1896    if (Module *ImportedFrom
1897          = ModMap.inferModuleFromLocation(FullSourceLoc(I->getLocation(),
1898                                                         SrcMgr))) {
1899      ImportedFrom->Imports.push_back(I->getImportedModule());
1900    }
1901  }
1902
1903  // Enter the submodule description block.
1904  Stream.EnterSubblock(SUBMODULE_BLOCK_ID, NUM_ALLOWED_ABBREVS_SIZE);
1905
1906  // Write the abbreviations needed for the submodules block.
1907  using namespace llvm;
1908  BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
1909  Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_DEFINITION));
1910  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ID
1911  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Parent
1912  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFramework
1913  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsExplicit
1914  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsSystem
1915  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InferSubmodules...
1916  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InferExplicit...
1917  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InferExportWild...
1918  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
1919  unsigned DefinitionAbbrev = Stream.EmitAbbrev(Abbrev);
1920
1921  Abbrev = new BitCodeAbbrev();
1922  Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_UMBRELLA_HEADER));
1923  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
1924  unsigned UmbrellaAbbrev = Stream.EmitAbbrev(Abbrev);
1925
1926  Abbrev = new BitCodeAbbrev();
1927  Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_HEADER));
1928  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
1929  unsigned HeaderAbbrev = Stream.EmitAbbrev(Abbrev);
1930
1931  Abbrev = new BitCodeAbbrev();
1932  Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_UMBRELLA_DIR));
1933  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Name
1934  unsigned UmbrellaDirAbbrev = Stream.EmitAbbrev(Abbrev);
1935
1936  Abbrev = new BitCodeAbbrev();
1937  Abbrev->Add(BitCodeAbbrevOp(SUBMODULE_REQUIRES));
1938  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // Feature
1939  unsigned RequiresAbbrev = Stream.EmitAbbrev(Abbrev);
1940
1941  // Write the submodule metadata block.
1942  RecordData Record;
1943  Record.push_back(getNumberOfModules(WritingModule));
1944  Record.push_back(FirstSubmoduleID - NUM_PREDEF_SUBMODULE_IDS);
1945  Stream.EmitRecord(SUBMODULE_METADATA, Record);
1946
1947  // Write all of the submodules.
1948  std::queue<Module *> Q;
1949  Q.push(WritingModule);
1950  while (!Q.empty()) {
1951    Module *Mod = Q.front();
1952    Q.pop();
1953    unsigned ID = getSubmoduleID(Mod);
1954
1955    // Emit the definition of the block.
1956    Record.clear();
1957    Record.push_back(SUBMODULE_DEFINITION);
1958    Record.push_back(ID);
1959    if (Mod->Parent) {
1960      assert(SubmoduleIDs[Mod->Parent] && "Submodule parent not written?");
1961      Record.push_back(SubmoduleIDs[Mod->Parent]);
1962    } else {
1963      Record.push_back(0);
1964    }
1965    Record.push_back(Mod->IsFramework);
1966    Record.push_back(Mod->IsExplicit);
1967    Record.push_back(Mod->IsSystem);
1968    Record.push_back(Mod->InferSubmodules);
1969    Record.push_back(Mod->InferExplicitSubmodules);
1970    Record.push_back(Mod->InferExportWildcard);
1971    Stream.EmitRecordWithBlob(DefinitionAbbrev, Record, Mod->Name);
1972
1973    // Emit the requirements.
1974    for (unsigned I = 0, N = Mod->Requires.size(); I != N; ++I) {
1975      Record.clear();
1976      Record.push_back(SUBMODULE_REQUIRES);
1977      Stream.EmitRecordWithBlob(RequiresAbbrev, Record,
1978                                Mod->Requires[I].data(),
1979                                Mod->Requires[I].size());
1980    }
1981
1982    // Emit the umbrella header, if there is one.
1983    if (const FileEntry *UmbrellaHeader = Mod->getUmbrellaHeader()) {
1984      Record.clear();
1985      Record.push_back(SUBMODULE_UMBRELLA_HEADER);
1986      Stream.EmitRecordWithBlob(UmbrellaAbbrev, Record,
1987                                UmbrellaHeader->getName());
1988    } else if (const DirectoryEntry *UmbrellaDir = Mod->getUmbrellaDir()) {
1989      Record.clear();
1990      Record.push_back(SUBMODULE_UMBRELLA_DIR);
1991      Stream.EmitRecordWithBlob(UmbrellaDirAbbrev, Record,
1992                                UmbrellaDir->getName());
1993    }
1994
1995    // Emit the headers.
1996    for (unsigned I = 0, N = Mod->Headers.size(); I != N; ++I) {
1997      Record.clear();
1998      Record.push_back(SUBMODULE_HEADER);
1999      Stream.EmitRecordWithBlob(HeaderAbbrev, Record,
2000                                Mod->Headers[I]->getName());
2001    }
2002
2003    // Emit the imports.
2004    if (!Mod->Imports.empty()) {
2005      Record.clear();
2006      for (unsigned I = 0, N = Mod->Imports.size(); I != N; ++I) {
2007        unsigned ImportedID = getSubmoduleID(Mod->Imports[I]);
2008        assert(ImportedID && "Unknown submodule!");
2009        Record.push_back(ImportedID);
2010      }
2011      Stream.EmitRecord(SUBMODULE_IMPORTS, Record);
2012    }
2013
2014    // Emit the exports.
2015    if (!Mod->Exports.empty()) {
2016      Record.clear();
2017      for (unsigned I = 0, N = Mod->Exports.size(); I != N; ++I) {
2018        if (Module *Exported = Mod->Exports[I].getPointer()) {
2019          unsigned ExportedID = SubmoduleIDs[Exported];
2020          assert(ExportedID > 0 && "Unknown submodule ID?");
2021          Record.push_back(ExportedID);
2022        } else {
2023          Record.push_back(0);
2024        }
2025
2026        Record.push_back(Mod->Exports[I].getInt());
2027      }
2028      Stream.EmitRecord(SUBMODULE_EXPORTS, Record);
2029    }
2030
2031    // Queue up the submodules of this module.
2032    for (Module::submodule_iterator Sub = Mod->submodule_begin(),
2033                                 SubEnd = Mod->submodule_end();
2034         Sub != SubEnd; ++Sub)
2035      Q.push(*Sub);
2036  }
2037
2038  Stream.ExitBlock();
2039
2040  assert((NextSubmoduleID - FirstSubmoduleID
2041            == getNumberOfModules(WritingModule)) && "Wrong # of submodules");
2042}
2043
2044serialization::SubmoduleID
2045ASTWriter::inferSubmoduleIDFromLocation(SourceLocation Loc) {
2046  if (Loc.isInvalid() || !WritingModule)
2047    return 0; // No submodule
2048
2049  // Find the module that owns this location.
2050  ModuleMap &ModMap = PP->getHeaderSearchInfo().getModuleMap();
2051  Module *OwningMod
2052    = ModMap.inferModuleFromLocation(FullSourceLoc(Loc,PP->getSourceManager()));
2053  if (!OwningMod)
2054    return 0;
2055
2056  // Check whether this submodule is part of our own module.
2057  if (WritingModule != OwningMod && !OwningMod->isSubModuleOf(WritingModule))
2058    return 0;
2059
2060  return getSubmoduleID(OwningMod);
2061}
2062
2063void ASTWriter::WritePragmaDiagnosticMappings(const DiagnosticsEngine &Diag) {
2064  RecordData Record;
2065  for (DiagnosticsEngine::DiagStatePointsTy::const_iterator
2066         I = Diag.DiagStatePoints.begin(), E = Diag.DiagStatePoints.end();
2067         I != E; ++I) {
2068    const DiagnosticsEngine::DiagStatePoint &point = *I;
2069    if (point.Loc.isInvalid())
2070      continue;
2071
2072    Record.push_back(point.Loc.getRawEncoding());
2073    for (DiagnosticsEngine::DiagState::const_iterator
2074           I = point.State->begin(), E = point.State->end(); I != E; ++I) {
2075      if (I->second.isPragma()) {
2076        Record.push_back(I->first);
2077        Record.push_back(I->second.getMapping());
2078      }
2079    }
2080    Record.push_back(-1); // mark the end of the diag/map pairs for this
2081                          // location.
2082  }
2083
2084  if (!Record.empty())
2085    Stream.EmitRecord(DIAG_PRAGMA_MAPPINGS, Record);
2086}
2087
2088void ASTWriter::WriteCXXBaseSpecifiersOffsets() {
2089  if (CXXBaseSpecifiersOffsets.empty())
2090    return;
2091
2092  RecordData Record;
2093
2094  // Create a blob abbreviation for the C++ base specifiers offsets.
2095  using namespace llvm;
2096
2097  BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
2098  Abbrev->Add(BitCodeAbbrevOp(CXX_BASE_SPECIFIER_OFFSETS));
2099  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // size
2100  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2101  unsigned BaseSpecifierOffsetAbbrev = Stream.EmitAbbrev(Abbrev);
2102
2103  // Write the base specifier offsets table.
2104  Record.clear();
2105  Record.push_back(CXX_BASE_SPECIFIER_OFFSETS);
2106  Record.push_back(CXXBaseSpecifiersOffsets.size());
2107  Stream.EmitRecordWithBlob(BaseSpecifierOffsetAbbrev, Record,
2108                            data(CXXBaseSpecifiersOffsets));
2109}
2110
2111//===----------------------------------------------------------------------===//
2112// Type Serialization
2113//===----------------------------------------------------------------------===//
2114
2115/// \brief Write the representation of a type to the AST stream.
2116void ASTWriter::WriteType(QualType T) {
2117  TypeIdx &Idx = TypeIdxs[T];
2118  if (Idx.getIndex() == 0) // we haven't seen this type before.
2119    Idx = TypeIdx(NextTypeID++);
2120
2121  assert(Idx.getIndex() >= FirstTypeID && "Re-writing a type from a prior AST");
2122
2123  // Record the offset for this type.
2124  unsigned Index = Idx.getIndex() - FirstTypeID;
2125  if (TypeOffsets.size() == Index)
2126    TypeOffsets.push_back(Stream.GetCurrentBitNo());
2127  else if (TypeOffsets.size() < Index) {
2128    TypeOffsets.resize(Index + 1);
2129    TypeOffsets[Index] = Stream.GetCurrentBitNo();
2130  }
2131
2132  RecordData Record;
2133
2134  // Emit the type's representation.
2135  ASTTypeWriter W(*this, Record);
2136
2137  if (T.hasLocalNonFastQualifiers()) {
2138    Qualifiers Qs = T.getLocalQualifiers();
2139    AddTypeRef(T.getLocalUnqualifiedType(), Record);
2140    Record.push_back(Qs.getAsOpaqueValue());
2141    W.Code = TYPE_EXT_QUAL;
2142  } else {
2143    switch (T->getTypeClass()) {
2144      // For all of the concrete, non-dependent types, call the
2145      // appropriate visitor function.
2146#define TYPE(Class, Base) \
2147    case Type::Class: W.Visit##Class##Type(cast<Class##Type>(T)); break;
2148#define ABSTRACT_TYPE(Class, Base)
2149#include "clang/AST/TypeNodes.def"
2150    }
2151  }
2152
2153  // Emit the serialized record.
2154  Stream.EmitRecord(W.Code, Record);
2155
2156  // Flush any expressions that were written as part of this type.
2157  FlushStmts();
2158}
2159
2160//===----------------------------------------------------------------------===//
2161// Declaration Serialization
2162//===----------------------------------------------------------------------===//
2163
2164/// \brief Write the block containing all of the declaration IDs
2165/// lexically declared within the given DeclContext.
2166///
2167/// \returns the offset of the DECL_CONTEXT_LEXICAL block within the
2168/// bistream, or 0 if no block was written.
2169uint64_t ASTWriter::WriteDeclContextLexicalBlock(ASTContext &Context,
2170                                                 DeclContext *DC) {
2171  if (DC->decls_empty())
2172    return 0;
2173
2174  uint64_t Offset = Stream.GetCurrentBitNo();
2175  RecordData Record;
2176  Record.push_back(DECL_CONTEXT_LEXICAL);
2177  SmallVector<KindDeclIDPair, 64> Decls;
2178  for (DeclContext::decl_iterator D = DC->decls_begin(), DEnd = DC->decls_end();
2179         D != DEnd; ++D)
2180    Decls.push_back(std::make_pair((*D)->getKind(), GetDeclRef(*D)));
2181
2182  ++NumLexicalDeclContexts;
2183  Stream.EmitRecordWithBlob(DeclContextLexicalAbbrev, Record, data(Decls));
2184  return Offset;
2185}
2186
2187void ASTWriter::WriteTypeDeclOffsets() {
2188  using namespace llvm;
2189  RecordData Record;
2190
2191  // Write the type offsets array
2192  BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
2193  Abbrev->Add(BitCodeAbbrevOp(TYPE_OFFSET));
2194  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // # of types
2195  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // base type index
2196  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // types block
2197  unsigned TypeOffsetAbbrev = Stream.EmitAbbrev(Abbrev);
2198  Record.clear();
2199  Record.push_back(TYPE_OFFSET);
2200  Record.push_back(TypeOffsets.size());
2201  Record.push_back(FirstTypeID - NUM_PREDEF_TYPE_IDS);
2202  Stream.EmitRecordWithBlob(TypeOffsetAbbrev, Record, data(TypeOffsets));
2203
2204  // Write the declaration offsets array
2205  Abbrev = new BitCodeAbbrev();
2206  Abbrev->Add(BitCodeAbbrevOp(DECL_OFFSET));
2207  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // # of declarations
2208  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // base decl ID
2209  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob)); // declarations block
2210  unsigned DeclOffsetAbbrev = Stream.EmitAbbrev(Abbrev);
2211  Record.clear();
2212  Record.push_back(DECL_OFFSET);
2213  Record.push_back(DeclOffsets.size());
2214  Record.push_back(FirstDeclID - NUM_PREDEF_DECL_IDS);
2215  Stream.EmitRecordWithBlob(DeclOffsetAbbrev, Record, data(DeclOffsets));
2216}
2217
2218void ASTWriter::WriteFileDeclIDsMap() {
2219  using namespace llvm;
2220  RecordData Record;
2221
2222  // Join the vectors of DeclIDs from all files.
2223  SmallVector<DeclID, 256> FileSortedIDs;
2224  for (FileDeclIDsTy::iterator
2225         FI = FileDeclIDs.begin(), FE = FileDeclIDs.end(); FI != FE; ++FI) {
2226    DeclIDInFileInfo &Info = *FI->second;
2227    Info.FirstDeclIndex = FileSortedIDs.size();
2228    for (LocDeclIDsTy::iterator
2229           DI = Info.DeclIDs.begin(), DE = Info.DeclIDs.end(); DI != DE; ++DI)
2230      FileSortedIDs.push_back(DI->second);
2231  }
2232
2233  BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
2234  Abbrev->Add(BitCodeAbbrevOp(FILE_SORTED_DECLS));
2235  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2236  unsigned AbbrevCode = Stream.EmitAbbrev(Abbrev);
2237  Record.push_back(FILE_SORTED_DECLS);
2238  Stream.EmitRecordWithBlob(AbbrevCode, Record, data(FileSortedIDs));
2239}
2240
2241//===----------------------------------------------------------------------===//
2242// Global Method Pool and Selector Serialization
2243//===----------------------------------------------------------------------===//
2244
2245namespace {
2246// Trait used for the on-disk hash table used in the method pool.
2247class ASTMethodPoolTrait {
2248  ASTWriter &Writer;
2249
2250public:
2251  typedef Selector key_type;
2252  typedef key_type key_type_ref;
2253
2254  struct data_type {
2255    SelectorID ID;
2256    ObjCMethodList Instance, Factory;
2257  };
2258  typedef const data_type& data_type_ref;
2259
2260  explicit ASTMethodPoolTrait(ASTWriter &Writer) : Writer(Writer) { }
2261
2262  static unsigned ComputeHash(Selector Sel) {
2263    return serialization::ComputeHash(Sel);
2264  }
2265
2266  std::pair<unsigned,unsigned>
2267    EmitKeyDataLength(raw_ostream& Out, Selector Sel,
2268                      data_type_ref Methods) {
2269    unsigned KeyLen = 2 + (Sel.getNumArgs()? Sel.getNumArgs() * 4 : 4);
2270    clang::io::Emit16(Out, KeyLen);
2271    unsigned DataLen = 4 + 2 + 2; // 2 bytes for each of the method counts
2272    for (const ObjCMethodList *Method = &Methods.Instance; Method;
2273         Method = Method->Next)
2274      if (Method->Method)
2275        DataLen += 4;
2276    for (const ObjCMethodList *Method = &Methods.Factory; Method;
2277         Method = Method->Next)
2278      if (Method->Method)
2279        DataLen += 4;
2280    clang::io::Emit16(Out, DataLen);
2281    return std::make_pair(KeyLen, DataLen);
2282  }
2283
2284  void EmitKey(raw_ostream& Out, Selector Sel, unsigned) {
2285    uint64_t Start = Out.tell();
2286    assert((Start >> 32) == 0 && "Selector key offset too large");
2287    Writer.SetSelectorOffset(Sel, Start);
2288    unsigned N = Sel.getNumArgs();
2289    clang::io::Emit16(Out, N);
2290    if (N == 0)
2291      N = 1;
2292    for (unsigned I = 0; I != N; ++I)
2293      clang::io::Emit32(Out,
2294                    Writer.getIdentifierRef(Sel.getIdentifierInfoForSlot(I)));
2295  }
2296
2297  void EmitData(raw_ostream& Out, key_type_ref,
2298                data_type_ref Methods, unsigned DataLen) {
2299    uint64_t Start = Out.tell(); (void)Start;
2300    clang::io::Emit32(Out, Methods.ID);
2301    unsigned NumInstanceMethods = 0;
2302    for (const ObjCMethodList *Method = &Methods.Instance; Method;
2303         Method = Method->Next)
2304      if (Method->Method)
2305        ++NumInstanceMethods;
2306
2307    unsigned NumFactoryMethods = 0;
2308    for (const ObjCMethodList *Method = &Methods.Factory; Method;
2309         Method = Method->Next)
2310      if (Method->Method)
2311        ++NumFactoryMethods;
2312
2313    clang::io::Emit16(Out, NumInstanceMethods);
2314    clang::io::Emit16(Out, NumFactoryMethods);
2315    for (const ObjCMethodList *Method = &Methods.Instance; Method;
2316         Method = Method->Next)
2317      if (Method->Method)
2318        clang::io::Emit32(Out, Writer.getDeclID(Method->Method));
2319    for (const ObjCMethodList *Method = &Methods.Factory; Method;
2320         Method = Method->Next)
2321      if (Method->Method)
2322        clang::io::Emit32(Out, Writer.getDeclID(Method->Method));
2323
2324    assert(Out.tell() - Start == DataLen && "Data length is wrong");
2325  }
2326};
2327} // end anonymous namespace
2328
2329/// \brief Write ObjC data: selectors and the method pool.
2330///
2331/// The method pool contains both instance and factory methods, stored
2332/// in an on-disk hash table indexed by the selector. The hash table also
2333/// contains an empty entry for every other selector known to Sema.
2334void ASTWriter::WriteSelectors(Sema &SemaRef) {
2335  using namespace llvm;
2336
2337  // Do we have to do anything at all?
2338  if (SemaRef.MethodPool.empty() && SelectorIDs.empty())
2339    return;
2340  unsigned NumTableEntries = 0;
2341  // Create and write out the blob that contains selectors and the method pool.
2342  {
2343    OnDiskChainedHashTableGenerator<ASTMethodPoolTrait> Generator;
2344    ASTMethodPoolTrait Trait(*this);
2345
2346    // Create the on-disk hash table representation. We walk through every
2347    // selector we've seen and look it up in the method pool.
2348    SelectorOffsets.resize(NextSelectorID - FirstSelectorID);
2349    for (llvm::DenseMap<Selector, SelectorID>::iterator
2350             I = SelectorIDs.begin(), E = SelectorIDs.end();
2351         I != E; ++I) {
2352      Selector S = I->first;
2353      Sema::GlobalMethodPool::iterator F = SemaRef.MethodPool.find(S);
2354      ASTMethodPoolTrait::data_type Data = {
2355        I->second,
2356        ObjCMethodList(),
2357        ObjCMethodList()
2358      };
2359      if (F != SemaRef.MethodPool.end()) {
2360        Data.Instance = F->second.first;
2361        Data.Factory = F->second.second;
2362      }
2363      // Only write this selector if it's not in an existing AST or something
2364      // changed.
2365      if (Chain && I->second < FirstSelectorID) {
2366        // Selector already exists. Did it change?
2367        bool changed = false;
2368        for (ObjCMethodList *M = &Data.Instance; !changed && M && M->Method;
2369             M = M->Next) {
2370          if (!M->Method->isFromASTFile())
2371            changed = true;
2372        }
2373        for (ObjCMethodList *M = &Data.Factory; !changed && M && M->Method;
2374             M = M->Next) {
2375          if (!M->Method->isFromASTFile())
2376            changed = true;
2377        }
2378        if (!changed)
2379          continue;
2380      } else if (Data.Instance.Method || Data.Factory.Method) {
2381        // A new method pool entry.
2382        ++NumTableEntries;
2383      }
2384      Generator.insert(S, Data, Trait);
2385    }
2386
2387    // Create the on-disk hash table in a buffer.
2388    SmallString<4096> MethodPool;
2389    uint32_t BucketOffset;
2390    {
2391      ASTMethodPoolTrait Trait(*this);
2392      llvm::raw_svector_ostream Out(MethodPool);
2393      // Make sure that no bucket is at offset 0
2394      clang::io::Emit32(Out, 0);
2395      BucketOffset = Generator.Emit(Out, Trait);
2396    }
2397
2398    // Create a blob abbreviation
2399    BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
2400    Abbrev->Add(BitCodeAbbrevOp(METHOD_POOL));
2401    Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
2402    Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
2403    Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2404    unsigned MethodPoolAbbrev = Stream.EmitAbbrev(Abbrev);
2405
2406    // Write the method pool
2407    RecordData Record;
2408    Record.push_back(METHOD_POOL);
2409    Record.push_back(BucketOffset);
2410    Record.push_back(NumTableEntries);
2411    Stream.EmitRecordWithBlob(MethodPoolAbbrev, Record, MethodPool.str());
2412
2413    // Create a blob abbreviation for the selector table offsets.
2414    Abbrev = new BitCodeAbbrev();
2415    Abbrev->Add(BitCodeAbbrevOp(SELECTOR_OFFSETS));
2416    Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // size
2417    Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // first ID
2418    Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2419    unsigned SelectorOffsetAbbrev = Stream.EmitAbbrev(Abbrev);
2420
2421    // Write the selector offsets table.
2422    Record.clear();
2423    Record.push_back(SELECTOR_OFFSETS);
2424    Record.push_back(SelectorOffsets.size());
2425    Record.push_back(FirstSelectorID - NUM_PREDEF_SELECTOR_IDS);
2426    Stream.EmitRecordWithBlob(SelectorOffsetAbbrev, Record,
2427                              data(SelectorOffsets));
2428  }
2429}
2430
2431/// \brief Write the selectors referenced in @selector expression into AST file.
2432void ASTWriter::WriteReferencedSelectorsPool(Sema &SemaRef) {
2433  using namespace llvm;
2434  if (SemaRef.ReferencedSelectors.empty())
2435    return;
2436
2437  RecordData Record;
2438
2439  // Note: this writes out all references even for a dependent AST. But it is
2440  // very tricky to fix, and given that @selector shouldn't really appear in
2441  // headers, probably not worth it. It's not a correctness issue.
2442  for (DenseMap<Selector, SourceLocation>::iterator S =
2443       SemaRef.ReferencedSelectors.begin(),
2444       E = SemaRef.ReferencedSelectors.end(); S != E; ++S) {
2445    Selector Sel = (*S).first;
2446    SourceLocation Loc = (*S).second;
2447    AddSelectorRef(Sel, Record);
2448    AddSourceLocation(Loc, Record);
2449  }
2450  Stream.EmitRecord(REFERENCED_SELECTOR_POOL, Record);
2451}
2452
2453//===----------------------------------------------------------------------===//
2454// Identifier Table Serialization
2455//===----------------------------------------------------------------------===//
2456
2457namespace {
2458class ASTIdentifierTableTrait {
2459  ASTWriter &Writer;
2460  Preprocessor &PP;
2461  IdentifierResolver &IdResolver;
2462  bool IsModule;
2463
2464  /// \brief Determines whether this is an "interesting" identifier
2465  /// that needs a full IdentifierInfo structure written into the hash
2466  /// table.
2467  bool isInterestingIdentifier(IdentifierInfo *II, MacroInfo *&Macro) {
2468    if (II->isPoisoned() ||
2469        II->isExtensionToken() ||
2470        II->getObjCOrBuiltinID() ||
2471        II->hasRevertedTokenIDToIdentifier() ||
2472        II->getFETokenInfo<void>())
2473      return true;
2474
2475    return hasMacroDefinition(II, Macro);
2476  }
2477
2478  bool hasMacroDefinition(IdentifierInfo *II, MacroInfo *&Macro) {
2479    if (!II->hasMacroDefinition())
2480      return false;
2481
2482    if (Macro || (Macro = PP.getMacroInfo(II)))
2483      return !Macro->isBuiltinMacro() && (!IsModule || Macro->isPublic());
2484
2485    return false;
2486  }
2487
2488public:
2489  typedef IdentifierInfo* key_type;
2490  typedef key_type  key_type_ref;
2491
2492  typedef IdentID data_type;
2493  typedef data_type data_type_ref;
2494
2495  ASTIdentifierTableTrait(ASTWriter &Writer, Preprocessor &PP,
2496                          IdentifierResolver &IdResolver, bool IsModule)
2497    : Writer(Writer), PP(PP), IdResolver(IdResolver), IsModule(IsModule) { }
2498
2499  static unsigned ComputeHash(const IdentifierInfo* II) {
2500    return llvm::HashString(II->getName());
2501  }
2502
2503  std::pair<unsigned,unsigned>
2504  EmitKeyDataLength(raw_ostream& Out, IdentifierInfo* II, IdentID ID) {
2505    unsigned KeyLen = II->getLength() + 1;
2506    unsigned DataLen = 4; // 4 bytes for the persistent ID << 1
2507    MacroInfo *Macro = 0;
2508    if (isInterestingIdentifier(II, Macro)) {
2509      DataLen += 2; // 2 bytes for builtin ID, flags
2510      if (hasMacroDefinition(II, Macro))
2511        DataLen += 8;
2512
2513      for (IdentifierResolver::iterator D = IdResolver.begin(II),
2514                                     DEnd = IdResolver.end();
2515           D != DEnd; ++D)
2516        DataLen += sizeof(DeclID);
2517    }
2518    clang::io::Emit16(Out, DataLen);
2519    // We emit the key length after the data length so that every
2520    // string is preceded by a 16-bit length. This matches the PTH
2521    // format for storing identifiers.
2522    clang::io::Emit16(Out, KeyLen);
2523    return std::make_pair(KeyLen, DataLen);
2524  }
2525
2526  void EmitKey(raw_ostream& Out, const IdentifierInfo* II,
2527               unsigned KeyLen) {
2528    // Record the location of the key data.  This is used when generating
2529    // the mapping from persistent IDs to strings.
2530    Writer.SetIdentifierOffset(II, Out.tell());
2531    Out.write(II->getNameStart(), KeyLen);
2532  }
2533
2534  void EmitData(raw_ostream& Out, IdentifierInfo* II,
2535                IdentID ID, unsigned) {
2536    MacroInfo *Macro = 0;
2537    if (!isInterestingIdentifier(II, Macro)) {
2538      clang::io::Emit32(Out, ID << 1);
2539      return;
2540    }
2541
2542    clang::io::Emit32(Out, (ID << 1) | 0x01);
2543    uint32_t Bits = 0;
2544    bool HasMacroDefinition = hasMacroDefinition(II, Macro);
2545    Bits = (uint32_t)II->getObjCOrBuiltinID();
2546    assert((Bits & 0x7ff) == Bits && "ObjCOrBuiltinID too big for ASTReader.");
2547    Bits = (Bits << 1) | unsigned(HasMacroDefinition);
2548    Bits = (Bits << 1) | unsigned(II->isExtensionToken());
2549    Bits = (Bits << 1) | unsigned(II->isPoisoned());
2550    Bits = (Bits << 1) | unsigned(II->hasRevertedTokenIDToIdentifier());
2551    Bits = (Bits << 1) | unsigned(II->isCPlusPlusOperatorKeyword());
2552    clang::io::Emit16(Out, Bits);
2553
2554    if (HasMacroDefinition) {
2555      clang::io::Emit32(Out, Writer.getMacroOffset(II));
2556      clang::io::Emit32(Out,
2557        Writer.inferSubmoduleIDFromLocation(Macro->getDefinitionLoc()));
2558    }
2559
2560    // Emit the declaration IDs in reverse order, because the
2561    // IdentifierResolver provides the declarations as they would be
2562    // visible (e.g., the function "stat" would come before the struct
2563    // "stat"), but the ASTReader adds declarations to the end of the list
2564    // (so we need to see the struct "status" before the function "status").
2565    // Only emit declarations that aren't from a chained PCH, though.
2566    SmallVector<Decl *, 16> Decls(IdResolver.begin(II),
2567                                  IdResolver.end());
2568    for (SmallVector<Decl *, 16>::reverse_iterator D = Decls.rbegin(),
2569                                                DEnd = Decls.rend();
2570         D != DEnd; ++D)
2571      clang::io::Emit32(Out, Writer.getDeclID(*D));
2572  }
2573};
2574} // end anonymous namespace
2575
2576/// \brief Write the identifier table into the AST file.
2577///
2578/// The identifier table consists of a blob containing string data
2579/// (the actual identifiers themselves) and a separate "offsets" index
2580/// that maps identifier IDs to locations within the blob.
2581void ASTWriter::WriteIdentifierTable(Preprocessor &PP,
2582                                     IdentifierResolver &IdResolver,
2583                                     bool IsModule) {
2584  using namespace llvm;
2585
2586  // Create and write out the blob that contains the identifier
2587  // strings.
2588  {
2589    OnDiskChainedHashTableGenerator<ASTIdentifierTableTrait> Generator;
2590    ASTIdentifierTableTrait Trait(*this, PP, IdResolver, IsModule);
2591
2592    // Look for any identifiers that were named while processing the
2593    // headers, but are otherwise not needed. We add these to the hash
2594    // table to enable checking of the predefines buffer in the case
2595    // where the user adds new macro definitions when building the AST
2596    // file.
2597    for (IdentifierTable::iterator ID = PP.getIdentifierTable().begin(),
2598                                IDEnd = PP.getIdentifierTable().end();
2599         ID != IDEnd; ++ID)
2600      getIdentifierRef(ID->second);
2601
2602    // Create the on-disk hash table representation. We only store offsets
2603    // for identifiers that appear here for the first time.
2604    IdentifierOffsets.resize(NextIdentID - FirstIdentID);
2605    for (llvm::DenseMap<const IdentifierInfo *, IdentID>::iterator
2606           ID = IdentifierIDs.begin(), IDEnd = IdentifierIDs.end();
2607         ID != IDEnd; ++ID) {
2608      assert(ID->first && "NULL identifier in identifier table");
2609      if (!Chain || !ID->first->isFromAST() ||
2610          ID->first->hasChangedSinceDeserialization())
2611        Generator.insert(const_cast<IdentifierInfo *>(ID->first), ID->second,
2612                         Trait);
2613    }
2614
2615    // Create the on-disk hash table in a buffer.
2616    SmallString<4096> IdentifierTable;
2617    uint32_t BucketOffset;
2618    {
2619      ASTIdentifierTableTrait Trait(*this, PP, IdResolver, IsModule);
2620      llvm::raw_svector_ostream Out(IdentifierTable);
2621      // Make sure that no bucket is at offset 0
2622      clang::io::Emit32(Out, 0);
2623      BucketOffset = Generator.Emit(Out, Trait);
2624    }
2625
2626    // Create a blob abbreviation
2627    BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
2628    Abbrev->Add(BitCodeAbbrevOp(IDENTIFIER_TABLE));
2629    Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
2630    Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2631    unsigned IDTableAbbrev = Stream.EmitAbbrev(Abbrev);
2632
2633    // Write the identifier table
2634    RecordData Record;
2635    Record.push_back(IDENTIFIER_TABLE);
2636    Record.push_back(BucketOffset);
2637    Stream.EmitRecordWithBlob(IDTableAbbrev, Record, IdentifierTable.str());
2638  }
2639
2640  // Write the offsets table for identifier IDs.
2641  BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
2642  Abbrev->Add(BitCodeAbbrevOp(IDENTIFIER_OFFSET));
2643  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // # of identifiers
2644  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // first ID
2645  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2646  unsigned IdentifierOffsetAbbrev = Stream.EmitAbbrev(Abbrev);
2647
2648  RecordData Record;
2649  Record.push_back(IDENTIFIER_OFFSET);
2650  Record.push_back(IdentifierOffsets.size());
2651  Record.push_back(FirstIdentID - NUM_PREDEF_IDENT_IDS);
2652  Stream.EmitRecordWithBlob(IdentifierOffsetAbbrev, Record,
2653                            data(IdentifierOffsets));
2654}
2655
2656//===----------------------------------------------------------------------===//
2657// DeclContext's Name Lookup Table Serialization
2658//===----------------------------------------------------------------------===//
2659
2660namespace {
2661// Trait used for the on-disk hash table used in the method pool.
2662class ASTDeclContextNameLookupTrait {
2663  ASTWriter &Writer;
2664
2665public:
2666  typedef DeclarationName key_type;
2667  typedef key_type key_type_ref;
2668
2669  typedef DeclContext::lookup_result data_type;
2670  typedef const data_type& data_type_ref;
2671
2672  explicit ASTDeclContextNameLookupTrait(ASTWriter &Writer) : Writer(Writer) { }
2673
2674  unsigned ComputeHash(DeclarationName Name) {
2675    llvm::FoldingSetNodeID ID;
2676    ID.AddInteger(Name.getNameKind());
2677
2678    switch (Name.getNameKind()) {
2679    case DeclarationName::Identifier:
2680      ID.AddString(Name.getAsIdentifierInfo()->getName());
2681      break;
2682    case DeclarationName::ObjCZeroArgSelector:
2683    case DeclarationName::ObjCOneArgSelector:
2684    case DeclarationName::ObjCMultiArgSelector:
2685      ID.AddInteger(serialization::ComputeHash(Name.getObjCSelector()));
2686      break;
2687    case DeclarationName::CXXConstructorName:
2688    case DeclarationName::CXXDestructorName:
2689    case DeclarationName::CXXConversionFunctionName:
2690      break;
2691    case DeclarationName::CXXOperatorName:
2692      ID.AddInteger(Name.getCXXOverloadedOperator());
2693      break;
2694    case DeclarationName::CXXLiteralOperatorName:
2695      ID.AddString(Name.getCXXLiteralIdentifier()->getName());
2696    case DeclarationName::CXXUsingDirective:
2697      break;
2698    }
2699
2700    return ID.ComputeHash();
2701  }
2702
2703  std::pair<unsigned,unsigned>
2704    EmitKeyDataLength(raw_ostream& Out, DeclarationName Name,
2705                      data_type_ref Lookup) {
2706    unsigned KeyLen = 1;
2707    switch (Name.getNameKind()) {
2708    case DeclarationName::Identifier:
2709    case DeclarationName::ObjCZeroArgSelector:
2710    case DeclarationName::ObjCOneArgSelector:
2711    case DeclarationName::ObjCMultiArgSelector:
2712    case DeclarationName::CXXLiteralOperatorName:
2713      KeyLen += 4;
2714      break;
2715    case DeclarationName::CXXOperatorName:
2716      KeyLen += 1;
2717      break;
2718    case DeclarationName::CXXConstructorName:
2719    case DeclarationName::CXXDestructorName:
2720    case DeclarationName::CXXConversionFunctionName:
2721    case DeclarationName::CXXUsingDirective:
2722      break;
2723    }
2724    clang::io::Emit16(Out, KeyLen);
2725
2726    // 2 bytes for num of decls and 4 for each DeclID.
2727    unsigned DataLen = 2 + 4 * (Lookup.second - Lookup.first);
2728    clang::io::Emit16(Out, DataLen);
2729
2730    return std::make_pair(KeyLen, DataLen);
2731  }
2732
2733  void EmitKey(raw_ostream& Out, DeclarationName Name, unsigned) {
2734    using namespace clang::io;
2735
2736    assert(Name.getNameKind() < 0x100 && "Invalid name kind ?");
2737    Emit8(Out, Name.getNameKind());
2738    switch (Name.getNameKind()) {
2739    case DeclarationName::Identifier:
2740      Emit32(Out, Writer.getIdentifierRef(Name.getAsIdentifierInfo()));
2741      break;
2742    case DeclarationName::ObjCZeroArgSelector:
2743    case DeclarationName::ObjCOneArgSelector:
2744    case DeclarationName::ObjCMultiArgSelector:
2745      Emit32(Out, Writer.getSelectorRef(Name.getObjCSelector()));
2746      break;
2747    case DeclarationName::CXXOperatorName:
2748      assert(Name.getCXXOverloadedOperator() < 0x100 && "Invalid operator ?");
2749      Emit8(Out, Name.getCXXOverloadedOperator());
2750      break;
2751    case DeclarationName::CXXLiteralOperatorName:
2752      Emit32(Out, Writer.getIdentifierRef(Name.getCXXLiteralIdentifier()));
2753      break;
2754    case DeclarationName::CXXConstructorName:
2755    case DeclarationName::CXXDestructorName:
2756    case DeclarationName::CXXConversionFunctionName:
2757    case DeclarationName::CXXUsingDirective:
2758      break;
2759    }
2760  }
2761
2762  void EmitData(raw_ostream& Out, key_type_ref,
2763                data_type Lookup, unsigned DataLen) {
2764    uint64_t Start = Out.tell(); (void)Start;
2765    clang::io::Emit16(Out, Lookup.second - Lookup.first);
2766    for (; Lookup.first != Lookup.second; ++Lookup.first)
2767      clang::io::Emit32(Out, Writer.GetDeclRef(*Lookup.first));
2768
2769    assert(Out.tell() - Start == DataLen && "Data length is wrong");
2770  }
2771};
2772} // end anonymous namespace
2773
2774/// \brief Write the block containing all of the declaration IDs
2775/// visible from the given DeclContext.
2776///
2777/// \returns the offset of the DECL_CONTEXT_VISIBLE block within the
2778/// bitstream, or 0 if no block was written.
2779uint64_t ASTWriter::WriteDeclContextVisibleBlock(ASTContext &Context,
2780                                                 DeclContext *DC) {
2781  if (DC->getPrimaryContext() != DC)
2782    return 0;
2783
2784  // Since there is no name lookup into functions or methods, don't bother to
2785  // build a visible-declarations table for these entities.
2786  if (DC->isFunctionOrMethod())
2787    return 0;
2788
2789  // If not in C++, we perform name lookup for the translation unit via the
2790  // IdentifierInfo chains, don't bother to build a visible-declarations table.
2791  // FIXME: In C++ we need the visible declarations in order to "see" the
2792  // friend declarations, is there a way to do this without writing the table ?
2793  if (DC->isTranslationUnit() && !Context.getLangOpts().CPlusPlus)
2794    return 0;
2795
2796  // Serialize the contents of the mapping used for lookup. Note that,
2797  // although we have two very different code paths, the serialized
2798  // representation is the same for both cases: a declaration name,
2799  // followed by a size, followed by references to the visible
2800  // declarations that have that name.
2801  uint64_t Offset = Stream.GetCurrentBitNo();
2802  StoredDeclsMap *Map = DC->buildLookup();
2803  if (!Map || Map->empty())
2804    return 0;
2805
2806  OnDiskChainedHashTableGenerator<ASTDeclContextNameLookupTrait> Generator;
2807  ASTDeclContextNameLookupTrait Trait(*this);
2808
2809  // Create the on-disk hash table representation.
2810  DeclarationName ConversionName;
2811  llvm::SmallVector<NamedDecl *, 4> ConversionDecls;
2812  for (StoredDeclsMap::iterator D = Map->begin(), DEnd = Map->end();
2813       D != DEnd; ++D) {
2814    DeclarationName Name = D->first;
2815    DeclContext::lookup_result Result = D->second.getLookupResult();
2816    if (Result.first != Result.second) {
2817      if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) {
2818        // Hash all conversion function names to the same name. The actual
2819        // type information in conversion function name is not used in the
2820        // key (since such type information is not stable across different
2821        // modules), so the intended effect is to coalesce all of the conversion
2822        // functions under a single key.
2823        if (!ConversionName)
2824          ConversionName = Name;
2825        ConversionDecls.append(Result.first, Result.second);
2826        continue;
2827      }
2828
2829      Generator.insert(Name, Result, Trait);
2830    }
2831  }
2832
2833  // Add the conversion functions
2834  if (!ConversionDecls.empty()) {
2835    Generator.insert(ConversionName,
2836                     DeclContext::lookup_result(ConversionDecls.begin(),
2837                                                ConversionDecls.end()),
2838                     Trait);
2839  }
2840
2841  // Create the on-disk hash table in a buffer.
2842  SmallString<4096> LookupTable;
2843  uint32_t BucketOffset;
2844  {
2845    llvm::raw_svector_ostream Out(LookupTable);
2846    // Make sure that no bucket is at offset 0
2847    clang::io::Emit32(Out, 0);
2848    BucketOffset = Generator.Emit(Out, Trait);
2849  }
2850
2851  // Write the lookup table
2852  RecordData Record;
2853  Record.push_back(DECL_CONTEXT_VISIBLE);
2854  Record.push_back(BucketOffset);
2855  Stream.EmitRecordWithBlob(DeclContextVisibleLookupAbbrev, Record,
2856                            LookupTable.str());
2857
2858  Stream.EmitRecord(DECL_CONTEXT_VISIBLE, Record);
2859  ++NumVisibleDeclContexts;
2860  return Offset;
2861}
2862
2863/// \brief Write an UPDATE_VISIBLE block for the given context.
2864///
2865/// UPDATE_VISIBLE blocks contain the declarations that are added to an existing
2866/// DeclContext in a dependent AST file. As such, they only exist for the TU
2867/// (in C++), for namespaces, and for classes with forward-declared unscoped
2868/// enumeration members (in C++11).
2869void ASTWriter::WriteDeclContextVisibleUpdate(const DeclContext *DC) {
2870  StoredDeclsMap *Map = static_cast<StoredDeclsMap*>(DC->getLookupPtr());
2871  if (!Map || Map->empty())
2872    return;
2873
2874  OnDiskChainedHashTableGenerator<ASTDeclContextNameLookupTrait> Generator;
2875  ASTDeclContextNameLookupTrait Trait(*this);
2876
2877  // Create the hash table.
2878  for (StoredDeclsMap::iterator D = Map->begin(), DEnd = Map->end();
2879       D != DEnd; ++D) {
2880    DeclarationName Name = D->first;
2881    DeclContext::lookup_result Result = D->second.getLookupResult();
2882    // For any name that appears in this table, the results are complete, i.e.
2883    // they overwrite results from previous PCHs. Merging is always a mess.
2884    if (Result.first != Result.second)
2885      Generator.insert(Name, Result, Trait);
2886  }
2887
2888  // Create the on-disk hash table in a buffer.
2889  SmallString<4096> LookupTable;
2890  uint32_t BucketOffset;
2891  {
2892    llvm::raw_svector_ostream Out(LookupTable);
2893    // Make sure that no bucket is at offset 0
2894    clang::io::Emit32(Out, 0);
2895    BucketOffset = Generator.Emit(Out, Trait);
2896  }
2897
2898  // Write the lookup table
2899  RecordData Record;
2900  Record.push_back(UPDATE_VISIBLE);
2901  Record.push_back(getDeclID(cast<Decl>(DC)));
2902  Record.push_back(BucketOffset);
2903  Stream.EmitRecordWithBlob(UpdateVisibleAbbrev, Record, LookupTable.str());
2904}
2905
2906/// \brief Write an FP_PRAGMA_OPTIONS block for the given FPOptions.
2907void ASTWriter::WriteFPPragmaOptions(const FPOptions &Opts) {
2908  RecordData Record;
2909  Record.push_back(Opts.fp_contract);
2910  Stream.EmitRecord(FP_PRAGMA_OPTIONS, Record);
2911}
2912
2913/// \brief Write an OPENCL_EXTENSIONS block for the given OpenCLOptions.
2914void ASTWriter::WriteOpenCLExtensions(Sema &SemaRef) {
2915  if (!SemaRef.Context.getLangOpts().OpenCL)
2916    return;
2917
2918  const OpenCLOptions &Opts = SemaRef.getOpenCLOptions();
2919  RecordData Record;
2920#define OPENCLEXT(nm)  Record.push_back(Opts.nm);
2921#include "clang/Basic/OpenCLExtensions.def"
2922  Stream.EmitRecord(OPENCL_EXTENSIONS, Record);
2923}
2924
2925void ASTWriter::WriteRedeclarations() {
2926  RecordData LocalRedeclChains;
2927  SmallVector<serialization::LocalRedeclarationsInfo, 2> LocalRedeclsMap;
2928
2929  for (unsigned I = 0, N = Redeclarations.size(); I != N; ++I) {
2930    Decl *First = Redeclarations[I];
2931    assert(First->getPreviousDecl() == 0 && "Not the first declaration?");
2932
2933    Decl *MostRecent = First->getMostRecentDecl();
2934
2935    // If we only have a single declaration, there is no point in storing
2936    // a redeclaration chain.
2937    if (First == MostRecent)
2938      continue;
2939
2940    unsigned Offset = LocalRedeclChains.size();
2941    unsigned Size = 0;
2942    LocalRedeclChains.push_back(0); // Placeholder for the size.
2943
2944    // Collect the set of local redeclarations of this declaration.
2945    for (Decl *Prev = MostRecent; Prev != First;
2946         Prev = Prev->getPreviousDecl()) {
2947      if (!Prev->isFromASTFile()) {
2948        AddDeclRef(Prev, LocalRedeclChains);
2949        ++Size;
2950      }
2951    }
2952    LocalRedeclChains[Offset] = Size;
2953
2954    // Reverse the set of local redeclarations, so that we store them in
2955    // order (since we found them in reverse order).
2956    std::reverse(LocalRedeclChains.end() - Size, LocalRedeclChains.end());
2957
2958    // Add the mapping from the first ID to the set of local declarations.
2959    LocalRedeclarationsInfo Info = { getDeclID(First), Offset };
2960    LocalRedeclsMap.push_back(Info);
2961
2962    assert(N == Redeclarations.size() &&
2963           "Deserialized a declaration we shouldn't have");
2964  }
2965
2966  if (LocalRedeclChains.empty())
2967    return;
2968
2969  // Sort the local redeclarations map by the first declaration ID,
2970  // since the reader will be performing binary searches on this information.
2971  llvm::array_pod_sort(LocalRedeclsMap.begin(), LocalRedeclsMap.end());
2972
2973  // Emit the local redeclarations map.
2974  using namespace llvm;
2975  llvm::BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
2976  Abbrev->Add(BitCodeAbbrevOp(LOCAL_REDECLARATIONS_MAP));
2977  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // # of entries
2978  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2979  unsigned AbbrevID = Stream.EmitAbbrev(Abbrev);
2980
2981  RecordData Record;
2982  Record.push_back(LOCAL_REDECLARATIONS_MAP);
2983  Record.push_back(LocalRedeclsMap.size());
2984  Stream.EmitRecordWithBlob(AbbrevID, Record,
2985    reinterpret_cast<char*>(LocalRedeclsMap.data()),
2986    LocalRedeclsMap.size() * sizeof(LocalRedeclarationsInfo));
2987
2988  // Emit the redeclaration chains.
2989  Stream.EmitRecord(LOCAL_REDECLARATIONS, LocalRedeclChains);
2990}
2991
2992void ASTWriter::WriteObjCCategories() {
2993  llvm::SmallVector<ObjCCategoriesInfo, 2> CategoriesMap;
2994  RecordData Categories;
2995
2996  for (unsigned I = 0, N = ObjCClassesWithCategories.size(); I != N; ++I) {
2997    unsigned Size = 0;
2998    unsigned StartIndex = Categories.size();
2999
3000    ObjCInterfaceDecl *Class = ObjCClassesWithCategories[I];
3001
3002    // Allocate space for the size.
3003    Categories.push_back(0);
3004
3005    // Add the categories.
3006    for (ObjCCategoryDecl *Cat = Class->getCategoryList();
3007         Cat; Cat = Cat->getNextClassCategory(), ++Size) {
3008      assert(getDeclID(Cat) != 0 && "Bogus category");
3009      AddDeclRef(Cat, Categories);
3010    }
3011
3012    // Update the size.
3013    Categories[StartIndex] = Size;
3014
3015    // Record this interface -> category map.
3016    ObjCCategoriesInfo CatInfo = { getDeclID(Class), StartIndex };
3017    CategoriesMap.push_back(CatInfo);
3018  }
3019
3020  // Sort the categories map by the definition ID, since the reader will be
3021  // performing binary searches on this information.
3022  llvm::array_pod_sort(CategoriesMap.begin(), CategoriesMap.end());
3023
3024  // Emit the categories map.
3025  using namespace llvm;
3026  llvm::BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
3027  Abbrev->Add(BitCodeAbbrevOp(OBJC_CATEGORIES_MAP));
3028  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // # of entries
3029  Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
3030  unsigned AbbrevID = Stream.EmitAbbrev(Abbrev);
3031
3032  RecordData Record;
3033  Record.push_back(OBJC_CATEGORIES_MAP);
3034  Record.push_back(CategoriesMap.size());
3035  Stream.EmitRecordWithBlob(AbbrevID, Record,
3036                            reinterpret_cast<char*>(CategoriesMap.data()),
3037                            CategoriesMap.size() * sizeof(ObjCCategoriesInfo));
3038
3039  // Emit the category lists.
3040  Stream.EmitRecord(OBJC_CATEGORIES, Categories);
3041}
3042
3043void ASTWriter::WriteMergedDecls() {
3044  if (!Chain || Chain->MergedDecls.empty())
3045    return;
3046
3047  RecordData Record;
3048  for (ASTReader::MergedDeclsMap::iterator I = Chain->MergedDecls.begin(),
3049                                        IEnd = Chain->MergedDecls.end();
3050       I != IEnd; ++I) {
3051    DeclID CanonID = I->first->isFromASTFile()? I->first->getGlobalID()
3052                                              : getDeclID(I->first);
3053    assert(CanonID && "Merged declaration not known?");
3054
3055    Record.push_back(CanonID);
3056    Record.push_back(I->second.size());
3057    Record.append(I->second.begin(), I->second.end());
3058  }
3059  Stream.EmitRecord(MERGED_DECLARATIONS, Record);
3060}
3061
3062//===----------------------------------------------------------------------===//
3063// General Serialization Routines
3064//===----------------------------------------------------------------------===//
3065
3066/// \brief Write a record containing the given attributes.
3067void ASTWriter::WriteAttributes(const AttrVec &Attrs, RecordDataImpl &Record) {
3068  Record.push_back(Attrs.size());
3069  for (AttrVec::const_iterator i = Attrs.begin(), e = Attrs.end(); i != e; ++i){
3070    const Attr * A = *i;
3071    Record.push_back(A->getKind()); // FIXME: stable encoding, target attrs
3072    AddSourceRange(A->getRange(), Record);
3073
3074#include "clang/Serialization/AttrPCHWrite.inc"
3075
3076  }
3077}
3078
3079void ASTWriter::AddString(StringRef Str, RecordDataImpl &Record) {
3080  Record.push_back(Str.size());
3081  Record.insert(Record.end(), Str.begin(), Str.end());
3082}
3083
3084void ASTWriter::AddVersionTuple(const VersionTuple &Version,
3085                                RecordDataImpl &Record) {
3086  Record.push_back(Version.getMajor());
3087  if (llvm::Optional<unsigned> Minor = Version.getMinor())
3088    Record.push_back(*Minor + 1);
3089  else
3090    Record.push_back(0);
3091  if (llvm::Optional<unsigned> Subminor = Version.getSubminor())
3092    Record.push_back(*Subminor + 1);
3093  else
3094    Record.push_back(0);
3095}
3096
3097/// \brief Note that the identifier II occurs at the given offset
3098/// within the identifier table.
3099void ASTWriter::SetIdentifierOffset(const IdentifierInfo *II, uint32_t Offset) {
3100  IdentID ID = IdentifierIDs[II];
3101  // Only store offsets new to this AST file. Other identifier names are looked
3102  // up earlier in the chain and thus don't need an offset.
3103  if (ID >= FirstIdentID)
3104    IdentifierOffsets[ID - FirstIdentID] = Offset;
3105}
3106
3107/// \brief Note that the selector Sel occurs at the given offset
3108/// within the method pool/selector table.
3109void ASTWriter::SetSelectorOffset(Selector Sel, uint32_t Offset) {
3110  unsigned ID = SelectorIDs[Sel];
3111  assert(ID && "Unknown selector");
3112  // Don't record offsets for selectors that are also available in a different
3113  // file.
3114  if (ID < FirstSelectorID)
3115    return;
3116  SelectorOffsets[ID - FirstSelectorID] = Offset;
3117}
3118
3119ASTWriter::ASTWriter(llvm::BitstreamWriter &Stream)
3120  : Stream(Stream), Context(0), PP(0), Chain(0), WritingModule(0),
3121    WritingAST(false), ASTHasCompilerErrors(false),
3122    FirstDeclID(NUM_PREDEF_DECL_IDS), NextDeclID(FirstDeclID),
3123    FirstTypeID(NUM_PREDEF_TYPE_IDS), NextTypeID(FirstTypeID),
3124    FirstIdentID(NUM_PREDEF_IDENT_IDS), NextIdentID(FirstIdentID),
3125    FirstSubmoduleID(NUM_PREDEF_SUBMODULE_IDS),
3126    NextSubmoduleID(FirstSubmoduleID),
3127    FirstSelectorID(NUM_PREDEF_SELECTOR_IDS), NextSelectorID(FirstSelectorID),
3128    CollectedStmts(&StmtsToEmit),
3129    NumStatements(0), NumMacros(0), NumLexicalDeclContexts(0),
3130    NumVisibleDeclContexts(0),
3131    NextCXXBaseSpecifiersID(1),
3132    DeclParmVarAbbrev(0), DeclContextLexicalAbbrev(0),
3133    DeclContextVisibleLookupAbbrev(0), UpdateVisibleAbbrev(0),
3134    DeclRefExprAbbrev(0), CharacterLiteralAbbrev(0),
3135    DeclRecordAbbrev(0), IntegerLiteralAbbrev(0),
3136    DeclTypedefAbbrev(0),
3137    DeclVarAbbrev(0), DeclFieldAbbrev(0),
3138    DeclEnumAbbrev(0), DeclObjCIvarAbbrev(0)
3139{
3140}
3141
3142ASTWriter::~ASTWriter() {
3143  for (FileDeclIDsTy::iterator
3144         I = FileDeclIDs.begin(), E = FileDeclIDs.end(); I != E; ++I)
3145    delete I->second;
3146}
3147
3148void ASTWriter::WriteAST(Sema &SemaRef, MemorizeStatCalls *StatCalls,
3149                         const std::string &OutputFile,
3150                         Module *WritingModule, StringRef isysroot,
3151                         bool hasErrors) {
3152  WritingAST = true;
3153
3154  ASTHasCompilerErrors = hasErrors;
3155
3156  // Emit the file header.
3157  Stream.Emit((unsigned)'C', 8);
3158  Stream.Emit((unsigned)'P', 8);
3159  Stream.Emit((unsigned)'C', 8);
3160  Stream.Emit((unsigned)'H', 8);
3161
3162  WriteBlockInfoBlock();
3163
3164  Context = &SemaRef.Context;
3165  PP = &SemaRef.PP;
3166  this->WritingModule = WritingModule;
3167  WriteASTCore(SemaRef, StatCalls, isysroot, OutputFile, WritingModule);
3168  Context = 0;
3169  PP = 0;
3170  this->WritingModule = 0;
3171
3172  WritingAST = false;
3173}
3174
3175template<typename Vector>
3176static void AddLazyVectorDecls(ASTWriter &Writer, Vector &Vec,
3177                               ASTWriter::RecordData &Record) {
3178  for (typename Vector::iterator I = Vec.begin(0, true), E = Vec.end();
3179       I != E; ++I)  {
3180    Writer.AddDeclRef(*I, Record);
3181  }
3182}
3183
3184void ASTWriter::WriteASTCore(Sema &SemaRef, MemorizeStatCalls *StatCalls,
3185                             StringRef isysroot,
3186                             const std::string &OutputFile,
3187                             Module *WritingModule) {
3188  using namespace llvm;
3189
3190  // Make sure that the AST reader knows to finalize itself.
3191  if (Chain)
3192    Chain->finalizeForWriting();
3193
3194  ASTContext &Context = SemaRef.Context;
3195  Preprocessor &PP = SemaRef.PP;
3196
3197  // Set up predefined declaration IDs.
3198  DeclIDs[Context.getTranslationUnitDecl()] = PREDEF_DECL_TRANSLATION_UNIT_ID;
3199  if (Context.ObjCIdDecl)
3200    DeclIDs[Context.ObjCIdDecl] = PREDEF_DECL_OBJC_ID_ID;
3201  if (Context.ObjCSelDecl)
3202    DeclIDs[Context.ObjCSelDecl] = PREDEF_DECL_OBJC_SEL_ID;
3203  if (Context.ObjCClassDecl)
3204    DeclIDs[Context.ObjCClassDecl] = PREDEF_DECL_OBJC_CLASS_ID;
3205  if (Context.ObjCProtocolClassDecl)
3206    DeclIDs[Context.ObjCProtocolClassDecl] = PREDEF_DECL_OBJC_PROTOCOL_ID;
3207  if (Context.Int128Decl)
3208    DeclIDs[Context.Int128Decl] = PREDEF_DECL_INT_128_ID;
3209  if (Context.UInt128Decl)
3210    DeclIDs[Context.UInt128Decl] = PREDEF_DECL_UNSIGNED_INT_128_ID;
3211  if (Context.ObjCInstanceTypeDecl)
3212    DeclIDs[Context.ObjCInstanceTypeDecl] = PREDEF_DECL_OBJC_INSTANCETYPE_ID;
3213
3214  if (!Chain) {
3215    // Make sure that we emit IdentifierInfos (and any attached
3216    // declarations) for builtins. We don't need to do this when we're
3217    // emitting chained PCH files, because all of the builtins will be
3218    // in the original PCH file.
3219    // FIXME: Modules won't like this at all.
3220    IdentifierTable &Table = PP.getIdentifierTable();
3221    SmallVector<const char *, 32> BuiltinNames;
3222    Context.BuiltinInfo.GetBuiltinNames(BuiltinNames,
3223                                        Context.getLangOpts().NoBuiltin);
3224    for (unsigned I = 0, N = BuiltinNames.size(); I != N; ++I)
3225      getIdentifierRef(&Table.get(BuiltinNames[I]));
3226  }
3227
3228  // If there are any out-of-date identifiers, bring them up to date.
3229  if (ExternalPreprocessorSource *ExtSource = PP.getExternalSource()) {
3230    for (IdentifierTable::iterator ID = PP.getIdentifierTable().begin(),
3231                                IDEnd = PP.getIdentifierTable().end();
3232         ID != IDEnd; ++ID)
3233      if (ID->second->isOutOfDate())
3234        ExtSource->updateOutOfDateIdentifier(*ID->second);
3235  }
3236
3237  // Build a record containing all of the tentative definitions in this file, in
3238  // TentativeDefinitions order.  Generally, this record will be empty for
3239  // headers.
3240  RecordData TentativeDefinitions;
3241  AddLazyVectorDecls(*this, SemaRef.TentativeDefinitions, TentativeDefinitions);
3242
3243  // Build a record containing all of the file scoped decls in this file.
3244  RecordData UnusedFileScopedDecls;
3245  AddLazyVectorDecls(*this, SemaRef.UnusedFileScopedDecls,
3246                     UnusedFileScopedDecls);
3247
3248  // Build a record containing all of the delegating constructors we still need
3249  // to resolve.
3250  RecordData DelegatingCtorDecls;
3251  AddLazyVectorDecls(*this, SemaRef.DelegatingCtorDecls, DelegatingCtorDecls);
3252
3253  // Write the set of weak, undeclared identifiers. We always write the
3254  // entire table, since later PCH files in a PCH chain are only interested in
3255  // the results at the end of the chain.
3256  RecordData WeakUndeclaredIdentifiers;
3257  if (!SemaRef.WeakUndeclaredIdentifiers.empty()) {
3258    for (llvm::DenseMap<IdentifierInfo*,WeakInfo>::iterator
3259         I = SemaRef.WeakUndeclaredIdentifiers.begin(),
3260         E = SemaRef.WeakUndeclaredIdentifiers.end(); I != E; ++I) {
3261      AddIdentifierRef(I->first, WeakUndeclaredIdentifiers);
3262      AddIdentifierRef(I->second.getAlias(), WeakUndeclaredIdentifiers);
3263      AddSourceLocation(I->second.getLocation(), WeakUndeclaredIdentifiers);
3264      WeakUndeclaredIdentifiers.push_back(I->second.getUsed());
3265    }
3266  }
3267
3268  // Build a record containing all of the locally-scoped external
3269  // declarations in this header file. Generally, this record will be
3270  // empty.
3271  RecordData LocallyScopedExternalDecls;
3272  // FIXME: This is filling in the AST file in densemap order which is
3273  // nondeterminstic!
3274  for (llvm::DenseMap<DeclarationName, NamedDecl *>::iterator
3275         TD = SemaRef.LocallyScopedExternalDecls.begin(),
3276         TDEnd = SemaRef.LocallyScopedExternalDecls.end();
3277       TD != TDEnd; ++TD) {
3278    if (!TD->second->isFromASTFile())
3279      AddDeclRef(TD->second, LocallyScopedExternalDecls);
3280  }
3281
3282  // Build a record containing all of the ext_vector declarations.
3283  RecordData ExtVectorDecls;
3284  AddLazyVectorDecls(*this, SemaRef.ExtVectorDecls, ExtVectorDecls);
3285
3286  // Build a record containing all of the VTable uses information.
3287  RecordData VTableUses;
3288  if (!SemaRef.VTableUses.empty()) {
3289    for (unsigned I = 0, N = SemaRef.VTableUses.size(); I != N; ++I) {
3290      AddDeclRef(SemaRef.VTableUses[I].first, VTableUses);
3291      AddSourceLocation(SemaRef.VTableUses[I].second, VTableUses);
3292      VTableUses.push_back(SemaRef.VTablesUsed[SemaRef.VTableUses[I].first]);
3293    }
3294  }
3295
3296  // Build a record containing all of dynamic classes declarations.
3297  RecordData DynamicClasses;
3298  AddLazyVectorDecls(*this, SemaRef.DynamicClasses, DynamicClasses);
3299
3300  // Build a record containing all of pending implicit instantiations.
3301  RecordData PendingInstantiations;
3302  for (std::deque<Sema::PendingImplicitInstantiation>::iterator
3303         I = SemaRef.PendingInstantiations.begin(),
3304         N = SemaRef.PendingInstantiations.end(); I != N; ++I) {
3305    AddDeclRef(I->first, PendingInstantiations);
3306    AddSourceLocation(I->second, PendingInstantiations);
3307  }
3308  assert(SemaRef.PendingLocalImplicitInstantiations.empty() &&
3309         "There are local ones at end of translation unit!");
3310
3311  // Build a record containing some declaration references.
3312  RecordData SemaDeclRefs;
3313  if (SemaRef.StdNamespace || SemaRef.StdBadAlloc) {
3314    AddDeclRef(SemaRef.getStdNamespace(), SemaDeclRefs);
3315    AddDeclRef(SemaRef.getStdBadAlloc(), SemaDeclRefs);
3316  }
3317
3318  RecordData CUDASpecialDeclRefs;
3319  if (Context.getcudaConfigureCallDecl()) {
3320    AddDeclRef(Context.getcudaConfigureCallDecl(), CUDASpecialDeclRefs);
3321  }
3322
3323  // Build a record containing all of the known namespaces.
3324  RecordData KnownNamespaces;
3325  for (llvm::DenseMap<NamespaceDecl*, bool>::iterator
3326            I = SemaRef.KnownNamespaces.begin(),
3327         IEnd = SemaRef.KnownNamespaces.end();
3328       I != IEnd; ++I) {
3329    if (!I->second)
3330      AddDeclRef(I->first, KnownNamespaces);
3331  }
3332
3333  // Write the remaining AST contents.
3334  RecordData Record;
3335  Stream.EnterSubblock(AST_BLOCK_ID, 5);
3336  WriteMetadata(Context, isysroot, OutputFile);
3337  WriteLanguageOptions(Context.getLangOpts());
3338  if (StatCalls && isysroot.empty())
3339    WriteStatCache(*StatCalls);
3340
3341  // Create a lexical update block containing all of the declarations in the
3342  // translation unit that do not come from other AST files.
3343  const TranslationUnitDecl *TU = Context.getTranslationUnitDecl();
3344  SmallVector<KindDeclIDPair, 64> NewGlobalDecls;
3345  for (DeclContext::decl_iterator I = TU->noload_decls_begin(),
3346                                  E = TU->noload_decls_end();
3347       I != E; ++I) {
3348    if (!(*I)->isFromASTFile())
3349      NewGlobalDecls.push_back(std::make_pair((*I)->getKind(), GetDeclRef(*I)));
3350  }
3351
3352  llvm::BitCodeAbbrev *Abv = new llvm::BitCodeAbbrev();
3353  Abv->Add(llvm::BitCodeAbbrevOp(TU_UPDATE_LEXICAL));
3354  Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::Blob));
3355  unsigned TuUpdateLexicalAbbrev = Stream.EmitAbbrev(Abv);
3356  Record.clear();
3357  Record.push_back(TU_UPDATE_LEXICAL);
3358  Stream.EmitRecordWithBlob(TuUpdateLexicalAbbrev, Record,
3359                            data(NewGlobalDecls));
3360
3361  // And a visible updates block for the translation unit.
3362  Abv = new llvm::BitCodeAbbrev();
3363  Abv->Add(llvm::BitCodeAbbrevOp(UPDATE_VISIBLE));
3364  Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::VBR, 6));
3365  Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::Fixed, 32));
3366  Abv->Add(llvm::BitCodeAbbrevOp(llvm::BitCodeAbbrevOp::Blob));
3367  UpdateVisibleAbbrev = Stream.EmitAbbrev(Abv);
3368  WriteDeclContextVisibleUpdate(TU);
3369
3370  // If the translation unit has an anonymous namespace, and we don't already
3371  // have an update block for it, write it as an update block.
3372  if (NamespaceDecl *NS = TU->getAnonymousNamespace()) {
3373    ASTWriter::UpdateRecord &Record = DeclUpdates[TU];
3374    if (Record.empty()) {
3375      Record.push_back(UPD_CXX_ADDED_ANONYMOUS_NAMESPACE);
3376      Record.push_back(reinterpret_cast<uint64_t>(NS));
3377    }
3378  }
3379
3380  // Resolve any declaration pointers within the declaration updates block.
3381  ResolveDeclUpdatesBlocks();
3382
3383  // Form the record of special types.
3384  RecordData SpecialTypes;
3385  AddTypeRef(Context.getBuiltinVaListType(), SpecialTypes);
3386  AddTypeRef(Context.getRawCFConstantStringType(), SpecialTypes);
3387  AddTypeRef(Context.getFILEType(), SpecialTypes);
3388  AddTypeRef(Context.getjmp_bufType(), SpecialTypes);
3389  AddTypeRef(Context.getsigjmp_bufType(), SpecialTypes);
3390  AddTypeRef(Context.ObjCIdRedefinitionType, SpecialTypes);
3391  AddTypeRef(Context.ObjCClassRedefinitionType, SpecialTypes);
3392  AddTypeRef(Context.ObjCSelRedefinitionType, SpecialTypes);
3393  AddTypeRef(Context.getucontext_tType(), SpecialTypes);
3394
3395  // Keep writing types and declarations until all types and
3396  // declarations have been written.
3397  Stream.EnterSubblock(DECLTYPES_BLOCK_ID, NUM_ALLOWED_ABBREVS_SIZE);
3398  WriteDeclsBlockAbbrevs();
3399  for (DeclsToRewriteTy::iterator I = DeclsToRewrite.begin(),
3400                                  E = DeclsToRewrite.end();
3401       I != E; ++I)
3402    DeclTypesToEmit.push(const_cast<Decl*>(*I));
3403  while (!DeclTypesToEmit.empty()) {
3404    DeclOrType DOT = DeclTypesToEmit.front();
3405    DeclTypesToEmit.pop();
3406    if (DOT.isType())
3407      WriteType(DOT.getType());
3408    else
3409      WriteDecl(Context, DOT.getDecl());
3410  }
3411  Stream.ExitBlock();
3412
3413  WriteFileDeclIDsMap();
3414  WriteSourceManagerBlock(Context.getSourceManager(), PP, isysroot);
3415
3416  if (Chain) {
3417    // Write the mapping information describing our module dependencies and how
3418    // each of those modules were mapped into our own offset/ID space, so that
3419    // the reader can build the appropriate mapping to its own offset/ID space.
3420    // The map consists solely of a blob with the following format:
3421    // *(module-name-len:i16 module-name:len*i8
3422    //   source-location-offset:i32
3423    //   identifier-id:i32
3424    //   preprocessed-entity-id:i32
3425    //   macro-definition-id:i32
3426    //   submodule-id:i32
3427    //   selector-id:i32
3428    //   declaration-id:i32
3429    //   c++-base-specifiers-id:i32
3430    //   type-id:i32)
3431    //
3432    llvm::BitCodeAbbrev *Abbrev = new BitCodeAbbrev();
3433    Abbrev->Add(BitCodeAbbrevOp(MODULE_OFFSET_MAP));
3434    Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
3435    unsigned ModuleOffsetMapAbbrev = Stream.EmitAbbrev(Abbrev);
3436    SmallString<2048> Buffer;
3437    {
3438      llvm::raw_svector_ostream Out(Buffer);
3439      for (ModuleManager::ModuleConstIterator M = Chain->ModuleMgr.begin(),
3440                                           MEnd = Chain->ModuleMgr.end();
3441           M != MEnd; ++M) {
3442        StringRef FileName = (*M)->FileName;
3443        io::Emit16(Out, FileName.size());
3444        Out.write(FileName.data(), FileName.size());
3445        io::Emit32(Out, (*M)->SLocEntryBaseOffset);
3446        io::Emit32(Out, (*M)->BaseIdentifierID);
3447        io::Emit32(Out, (*M)->BasePreprocessedEntityID);
3448        io::Emit32(Out, (*M)->BaseSubmoduleID);
3449        io::Emit32(Out, (*M)->BaseSelectorID);
3450        io::Emit32(Out, (*M)->BaseDeclID);
3451        io::Emit32(Out, (*M)->BaseTypeIndex);
3452      }
3453    }
3454    Record.clear();
3455    Record.push_back(MODULE_OFFSET_MAP);
3456    Stream.EmitRecordWithBlob(ModuleOffsetMapAbbrev, Record,
3457                              Buffer.data(), Buffer.size());
3458  }
3459  WritePreprocessor(PP, WritingModule != 0);
3460  WriteHeaderSearch(PP.getHeaderSearchInfo(), isysroot);
3461  WriteSelectors(SemaRef);
3462  WriteReferencedSelectorsPool(SemaRef);
3463  WriteIdentifierTable(PP, SemaRef.IdResolver, WritingModule != 0);
3464  WriteFPPragmaOptions(SemaRef.getFPOptions());
3465  WriteOpenCLExtensions(SemaRef);
3466
3467  WriteTypeDeclOffsets();
3468  WritePragmaDiagnosticMappings(Context.getDiagnostics());
3469
3470  WriteCXXBaseSpecifiersOffsets();
3471
3472  // If we're emitting a module, write out the submodule information.
3473  if (WritingModule)
3474    WriteSubmodules(WritingModule);
3475
3476  Stream.EmitRecord(SPECIAL_TYPES, SpecialTypes);
3477
3478  // Write the record containing external, unnamed definitions.
3479  if (!ExternalDefinitions.empty())
3480    Stream.EmitRecord(EXTERNAL_DEFINITIONS, ExternalDefinitions);
3481
3482  // Write the record containing tentative definitions.
3483  if (!TentativeDefinitions.empty())
3484    Stream.EmitRecord(TENTATIVE_DEFINITIONS, TentativeDefinitions);
3485
3486  // Write the record containing unused file scoped decls.
3487  if (!UnusedFileScopedDecls.empty())
3488    Stream.EmitRecord(UNUSED_FILESCOPED_DECLS, UnusedFileScopedDecls);
3489
3490  // Write the record containing weak undeclared identifiers.
3491  if (!WeakUndeclaredIdentifiers.empty())
3492    Stream.EmitRecord(WEAK_UNDECLARED_IDENTIFIERS,
3493                      WeakUndeclaredIdentifiers);
3494
3495  // Write the record containing locally-scoped external definitions.
3496  if (!LocallyScopedExternalDecls.empty())
3497    Stream.EmitRecord(LOCALLY_SCOPED_EXTERNAL_DECLS,
3498                      LocallyScopedExternalDecls);
3499
3500  // Write the record containing ext_vector type names.
3501  if (!ExtVectorDecls.empty())
3502    Stream.EmitRecord(EXT_VECTOR_DECLS, ExtVectorDecls);
3503
3504  // Write the record containing VTable uses information.
3505  if (!VTableUses.empty())
3506    Stream.EmitRecord(VTABLE_USES, VTableUses);
3507
3508  // Write the record containing dynamic classes declarations.
3509  if (!DynamicClasses.empty())
3510    Stream.EmitRecord(DYNAMIC_CLASSES, DynamicClasses);
3511
3512  // Write the record containing pending implicit instantiations.
3513  if (!PendingInstantiations.empty())
3514    Stream.EmitRecord(PENDING_IMPLICIT_INSTANTIATIONS, PendingInstantiations);
3515
3516  // Write the record containing declaration references of Sema.
3517  if (!SemaDeclRefs.empty())
3518    Stream.EmitRecord(SEMA_DECL_REFS, SemaDeclRefs);
3519
3520  // Write the record containing CUDA-specific declaration references.
3521  if (!CUDASpecialDeclRefs.empty())
3522    Stream.EmitRecord(CUDA_SPECIAL_DECL_REFS, CUDASpecialDeclRefs);
3523
3524  // Write the delegating constructors.
3525  if (!DelegatingCtorDecls.empty())
3526    Stream.EmitRecord(DELEGATING_CTORS, DelegatingCtorDecls);
3527
3528  // Write the known namespaces.
3529  if (!KnownNamespaces.empty())
3530    Stream.EmitRecord(KNOWN_NAMESPACES, KnownNamespaces);
3531
3532  // Write the visible updates to DeclContexts.
3533  for (llvm::SmallPtrSet<const DeclContext *, 16>::iterator
3534       I = UpdatedDeclContexts.begin(),
3535       E = UpdatedDeclContexts.end();
3536       I != E; ++I)
3537    WriteDeclContextVisibleUpdate(*I);
3538
3539  if (!WritingModule) {
3540    // Write the submodules that were imported, if any.
3541    RecordData ImportedModules;
3542    for (ASTContext::import_iterator I = Context.local_import_begin(),
3543                                  IEnd = Context.local_import_end();
3544         I != IEnd; ++I) {
3545      assert(SubmoduleIDs.find(I->getImportedModule()) != SubmoduleIDs.end());
3546      ImportedModules.push_back(SubmoduleIDs[I->getImportedModule()]);
3547    }
3548    if (!ImportedModules.empty()) {
3549      // Sort module IDs.
3550      llvm::array_pod_sort(ImportedModules.begin(), ImportedModules.end());
3551
3552      // Unique module IDs.
3553      ImportedModules.erase(std::unique(ImportedModules.begin(),
3554                                        ImportedModules.end()),
3555                            ImportedModules.end());
3556
3557      Stream.EmitRecord(IMPORTED_MODULES, ImportedModules);
3558    }
3559  }
3560
3561  WriteDeclUpdatesBlocks();
3562  WriteDeclReplacementsBlock();
3563  WriteMergedDecls();
3564  WriteRedeclarations();
3565  WriteObjCCategories();
3566
3567  // Some simple statistics
3568  Record.clear();
3569  Record.push_back(NumStatements);
3570  Record.push_back(NumMacros);
3571  Record.push_back(NumLexicalDeclContexts);
3572  Record.push_back(NumVisibleDeclContexts);
3573  Stream.EmitRecord(STATISTICS, Record);
3574  Stream.ExitBlock();
3575}
3576
3577/// \brief Go through the declaration update blocks and resolve declaration
3578/// pointers into declaration IDs.
3579void ASTWriter::ResolveDeclUpdatesBlocks() {
3580  for (DeclUpdateMap::iterator
3581       I = DeclUpdates.begin(), E = DeclUpdates.end(); I != E; ++I) {
3582    const Decl *D = I->first;
3583    UpdateRecord &URec = I->second;
3584
3585    if (isRewritten(D))
3586      continue; // The decl will be written completely
3587
3588    unsigned Idx = 0, N = URec.size();
3589    while (Idx < N) {
3590      switch ((DeclUpdateKind)URec[Idx++]) {
3591      case UPD_CXX_ADDED_IMPLICIT_MEMBER:
3592      case UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION:
3593      case UPD_CXX_ADDED_ANONYMOUS_NAMESPACE:
3594        URec[Idx] = GetDeclRef(reinterpret_cast<Decl *>(URec[Idx]));
3595        ++Idx;
3596        break;
3597
3598      case UPD_CXX_INSTANTIATED_STATIC_DATA_MEMBER:
3599        ++Idx;
3600        break;
3601      }
3602    }
3603  }
3604}
3605
3606void ASTWriter::WriteDeclUpdatesBlocks() {
3607  if (DeclUpdates.empty())
3608    return;
3609
3610  RecordData OffsetsRecord;
3611  Stream.EnterSubblock(DECL_UPDATES_BLOCK_ID, NUM_ALLOWED_ABBREVS_SIZE);
3612  for (DeclUpdateMap::iterator
3613         I = DeclUpdates.begin(), E = DeclUpdates.end(); I != E; ++I) {
3614    const Decl *D = I->first;
3615    UpdateRecord &URec = I->second;
3616
3617    if (isRewritten(D))
3618      continue; // The decl will be written completely,no need to store updates.
3619
3620    uint64_t Offset = Stream.GetCurrentBitNo();
3621    Stream.EmitRecord(DECL_UPDATES, URec);
3622
3623    OffsetsRecord.push_back(GetDeclRef(D));
3624    OffsetsRecord.push_back(Offset);
3625  }
3626  Stream.ExitBlock();
3627  Stream.EmitRecord(DECL_UPDATE_OFFSETS, OffsetsRecord);
3628}
3629
3630void ASTWriter::WriteDeclReplacementsBlock() {
3631  if (ReplacedDecls.empty())
3632    return;
3633
3634  RecordData Record;
3635  for (SmallVector<ReplacedDeclInfo, 16>::iterator
3636           I = ReplacedDecls.begin(), E = ReplacedDecls.end(); I != E; ++I) {
3637    Record.push_back(I->ID);
3638    Record.push_back(I->Offset);
3639    Record.push_back(I->Loc);
3640  }
3641  Stream.EmitRecord(DECL_REPLACEMENTS, Record);
3642}
3643
3644void ASTWriter::AddSourceLocation(SourceLocation Loc, RecordDataImpl &Record) {
3645  Record.push_back(Loc.getRawEncoding());
3646}
3647
3648void ASTWriter::AddSourceRange(SourceRange Range, RecordDataImpl &Record) {
3649  AddSourceLocation(Range.getBegin(), Record);
3650  AddSourceLocation(Range.getEnd(), Record);
3651}
3652
3653void ASTWriter::AddAPInt(const llvm::APInt &Value, RecordDataImpl &Record) {
3654  Record.push_back(Value.getBitWidth());
3655  const uint64_t *Words = Value.getRawData();
3656  Record.append(Words, Words + Value.getNumWords());
3657}
3658
3659void ASTWriter::AddAPSInt(const llvm::APSInt &Value, RecordDataImpl &Record) {
3660  Record.push_back(Value.isUnsigned());
3661  AddAPInt(Value, Record);
3662}
3663
3664void ASTWriter::AddAPFloat(const llvm::APFloat &Value, RecordDataImpl &Record) {
3665  AddAPInt(Value.bitcastToAPInt(), Record);
3666}
3667
3668void ASTWriter::AddIdentifierRef(const IdentifierInfo *II, RecordDataImpl &Record) {
3669  Record.push_back(getIdentifierRef(II));
3670}
3671
3672IdentID ASTWriter::getIdentifierRef(const IdentifierInfo *II) {
3673  if (II == 0)
3674    return 0;
3675
3676  IdentID &ID = IdentifierIDs[II];
3677  if (ID == 0)
3678    ID = NextIdentID++;
3679  return ID;
3680}
3681
3682void ASTWriter::AddSelectorRef(const Selector SelRef, RecordDataImpl &Record) {
3683  Record.push_back(getSelectorRef(SelRef));
3684}
3685
3686SelectorID ASTWriter::getSelectorRef(Selector Sel) {
3687  if (Sel.getAsOpaquePtr() == 0) {
3688    return 0;
3689  }
3690
3691  SelectorID &SID = SelectorIDs[Sel];
3692  if (SID == 0 && Chain) {
3693    // This might trigger a ReadSelector callback, which will set the ID for
3694    // this selector.
3695    Chain->LoadSelector(Sel);
3696  }
3697  if (SID == 0) {
3698    SID = NextSelectorID++;
3699  }
3700  return SID;
3701}
3702
3703void ASTWriter::AddCXXTemporary(const CXXTemporary *Temp, RecordDataImpl &Record) {
3704  AddDeclRef(Temp->getDestructor(), Record);
3705}
3706
3707void ASTWriter::AddCXXBaseSpecifiersRef(CXXBaseSpecifier const *Bases,
3708                                      CXXBaseSpecifier const *BasesEnd,
3709                                        RecordDataImpl &Record) {
3710  assert(Bases != BasesEnd && "Empty base-specifier sets are not recorded");
3711  CXXBaseSpecifiersToWrite.push_back(
3712                                QueuedCXXBaseSpecifiers(NextCXXBaseSpecifiersID,
3713                                                        Bases, BasesEnd));
3714  Record.push_back(NextCXXBaseSpecifiersID++);
3715}
3716
3717void ASTWriter::AddTemplateArgumentLocInfo(TemplateArgument::ArgKind Kind,
3718                                           const TemplateArgumentLocInfo &Arg,
3719                                           RecordDataImpl &Record) {
3720  switch (Kind) {
3721  case TemplateArgument::Expression:
3722    AddStmt(Arg.getAsExpr());
3723    break;
3724  case TemplateArgument::Type:
3725    AddTypeSourceInfo(Arg.getAsTypeSourceInfo(), Record);
3726    break;
3727  case TemplateArgument::Template:
3728    AddNestedNameSpecifierLoc(Arg.getTemplateQualifierLoc(), Record);
3729    AddSourceLocation(Arg.getTemplateNameLoc(), Record);
3730    break;
3731  case TemplateArgument::TemplateExpansion:
3732    AddNestedNameSpecifierLoc(Arg.getTemplateQualifierLoc(), Record);
3733    AddSourceLocation(Arg.getTemplateNameLoc(), Record);
3734    AddSourceLocation(Arg.getTemplateEllipsisLoc(), Record);
3735    break;
3736  case TemplateArgument::Null:
3737  case TemplateArgument::Integral:
3738  case TemplateArgument::Declaration:
3739  case TemplateArgument::Pack:
3740    break;
3741  }
3742}
3743
3744void ASTWriter::AddTemplateArgumentLoc(const TemplateArgumentLoc &Arg,
3745                                       RecordDataImpl &Record) {
3746  AddTemplateArgument(Arg.getArgument(), Record);
3747
3748  if (Arg.getArgument().getKind() == TemplateArgument::Expression) {
3749    bool InfoHasSameExpr
3750      = Arg.getArgument().getAsExpr() == Arg.getLocInfo().getAsExpr();
3751    Record.push_back(InfoHasSameExpr);
3752    if (InfoHasSameExpr)
3753      return; // Avoid storing the same expr twice.
3754  }
3755  AddTemplateArgumentLocInfo(Arg.getArgument().getKind(), Arg.getLocInfo(),
3756                             Record);
3757}
3758
3759void ASTWriter::AddTypeSourceInfo(TypeSourceInfo *TInfo,
3760                                  RecordDataImpl &Record) {
3761  if (TInfo == 0) {
3762    AddTypeRef(QualType(), Record);
3763    return;
3764  }
3765
3766  AddTypeLoc(TInfo->getTypeLoc(), Record);
3767}
3768
3769void ASTWriter::AddTypeLoc(TypeLoc TL, RecordDataImpl &Record) {
3770  AddTypeRef(TL.getType(), Record);
3771
3772  TypeLocWriter TLW(*this, Record);
3773  for (; !TL.isNull(); TL = TL.getNextTypeLoc())
3774    TLW.Visit(TL);
3775}
3776
3777void ASTWriter::AddTypeRef(QualType T, RecordDataImpl &Record) {
3778  Record.push_back(GetOrCreateTypeID(T));
3779}
3780
3781TypeID ASTWriter::GetOrCreateTypeID( QualType T) {
3782  return MakeTypeID(*Context, T,
3783              std::bind1st(std::mem_fun(&ASTWriter::GetOrCreateTypeIdx), this));
3784}
3785
3786TypeID ASTWriter::getTypeID(QualType T) const {
3787  return MakeTypeID(*Context, T,
3788              std::bind1st(std::mem_fun(&ASTWriter::getTypeIdx), this));
3789}
3790
3791TypeIdx ASTWriter::GetOrCreateTypeIdx(QualType T) {
3792  if (T.isNull())
3793    return TypeIdx();
3794  assert(!T.getLocalFastQualifiers());
3795
3796  TypeIdx &Idx = TypeIdxs[T];
3797  if (Idx.getIndex() == 0) {
3798    // We haven't seen this type before. Assign it a new ID and put it
3799    // into the queue of types to emit.
3800    Idx = TypeIdx(NextTypeID++);
3801    DeclTypesToEmit.push(T);
3802  }
3803  return Idx;
3804}
3805
3806TypeIdx ASTWriter::getTypeIdx(QualType T) const {
3807  if (T.isNull())
3808    return TypeIdx();
3809  assert(!T.getLocalFastQualifiers());
3810
3811  TypeIdxMap::const_iterator I = TypeIdxs.find(T);
3812  assert(I != TypeIdxs.end() && "Type not emitted!");
3813  return I->second;
3814}
3815
3816void ASTWriter::AddDeclRef(const Decl *D, RecordDataImpl &Record) {
3817  Record.push_back(GetDeclRef(D));
3818}
3819
3820DeclID ASTWriter::GetDeclRef(const Decl *D) {
3821  assert(WritingAST && "Cannot request a declaration ID before AST writing");
3822
3823  if (D == 0) {
3824    return 0;
3825  }
3826
3827  // If D comes from an AST file, its declaration ID is already known and
3828  // fixed.
3829  if (D->isFromASTFile())
3830    return D->getGlobalID();
3831
3832  assert(!(reinterpret_cast<uintptr_t>(D) & 0x01) && "Invalid decl pointer");
3833  DeclID &ID = DeclIDs[D];
3834  if (ID == 0) {
3835    // We haven't seen this declaration before. Give it a new ID and
3836    // enqueue it in the list of declarations to emit.
3837    ID = NextDeclID++;
3838    DeclTypesToEmit.push(const_cast<Decl *>(D));
3839  }
3840
3841  return ID;
3842}
3843
3844DeclID ASTWriter::getDeclID(const Decl *D) {
3845  if (D == 0)
3846    return 0;
3847
3848  // If D comes from an AST file, its declaration ID is already known and
3849  // fixed.
3850  if (D->isFromASTFile())
3851    return D->getGlobalID();
3852
3853  assert(DeclIDs.find(D) != DeclIDs.end() && "Declaration not emitted!");
3854  return DeclIDs[D];
3855}
3856
3857static inline bool compLocDecl(std::pair<unsigned, serialization::DeclID> L,
3858                               std::pair<unsigned, serialization::DeclID> R) {
3859  return L.first < R.first;
3860}
3861
3862void ASTWriter::associateDeclWithFile(const Decl *D, DeclID ID) {
3863  assert(ID);
3864  assert(D);
3865
3866  SourceLocation Loc = D->getLocation();
3867  if (Loc.isInvalid())
3868    return;
3869
3870  // We only keep track of the file-level declarations of each file.
3871  if (!D->getLexicalDeclContext()->isFileContext())
3872    return;
3873  // FIXME: ParmVarDecls that are part of a function type of a parameter of
3874  // a function/objc method, should not have TU as lexical context.
3875  if (isa<ParmVarDecl>(D))
3876    return;
3877
3878  SourceManager &SM = Context->getSourceManager();
3879  SourceLocation FileLoc = SM.getFileLoc(Loc);
3880  assert(SM.isLocalSourceLocation(FileLoc));
3881  FileID FID;
3882  unsigned Offset;
3883  llvm::tie(FID, Offset) = SM.getDecomposedLoc(FileLoc);
3884  if (FID.isInvalid())
3885    return;
3886  const SrcMgr::SLocEntry *Entry = &SM.getSLocEntry(FID);
3887  assert(Entry->isFile());
3888
3889  DeclIDInFileInfo *&Info = FileDeclIDs[Entry];
3890  if (!Info)
3891    Info = new DeclIDInFileInfo();
3892
3893  std::pair<unsigned, serialization::DeclID> LocDecl(Offset, ID);
3894  LocDeclIDsTy &Decls = Info->DeclIDs;
3895
3896  if (Decls.empty() || Decls.back().first <= Offset) {
3897    Decls.push_back(LocDecl);
3898    return;
3899  }
3900
3901  LocDeclIDsTy::iterator
3902    I = std::upper_bound(Decls.begin(), Decls.end(), LocDecl, compLocDecl);
3903
3904  Decls.insert(I, LocDecl);
3905}
3906
3907void ASTWriter::AddDeclarationName(DeclarationName Name, RecordDataImpl &Record) {
3908  // FIXME: Emit a stable enum for NameKind.  0 = Identifier etc.
3909  Record.push_back(Name.getNameKind());
3910  switch (Name.getNameKind()) {
3911  case DeclarationName::Identifier:
3912    AddIdentifierRef(Name.getAsIdentifierInfo(), Record);
3913    break;
3914
3915  case DeclarationName::ObjCZeroArgSelector:
3916  case DeclarationName::ObjCOneArgSelector:
3917  case DeclarationName::ObjCMultiArgSelector:
3918    AddSelectorRef(Name.getObjCSelector(), Record);
3919    break;
3920
3921  case DeclarationName::CXXConstructorName:
3922  case DeclarationName::CXXDestructorName:
3923  case DeclarationName::CXXConversionFunctionName:
3924    AddTypeRef(Name.getCXXNameType(), Record);
3925    break;
3926
3927  case DeclarationName::CXXOperatorName:
3928    Record.push_back(Name.getCXXOverloadedOperator());
3929    break;
3930
3931  case DeclarationName::CXXLiteralOperatorName:
3932    AddIdentifierRef(Name.getCXXLiteralIdentifier(), Record);
3933    break;
3934
3935  case DeclarationName::CXXUsingDirective:
3936    // No extra data to emit
3937    break;
3938  }
3939}
3940
3941void ASTWriter::AddDeclarationNameLoc(const DeclarationNameLoc &DNLoc,
3942                                     DeclarationName Name, RecordDataImpl &Record) {
3943  switch (Name.getNameKind()) {
3944  case DeclarationName::CXXConstructorName:
3945  case DeclarationName::CXXDestructorName:
3946  case DeclarationName::CXXConversionFunctionName:
3947    AddTypeSourceInfo(DNLoc.NamedType.TInfo, Record);
3948    break;
3949
3950  case DeclarationName::CXXOperatorName:
3951    AddSourceLocation(
3952       SourceLocation::getFromRawEncoding(DNLoc.CXXOperatorName.BeginOpNameLoc),
3953       Record);
3954    AddSourceLocation(
3955        SourceLocation::getFromRawEncoding(DNLoc.CXXOperatorName.EndOpNameLoc),
3956        Record);
3957    break;
3958
3959  case DeclarationName::CXXLiteralOperatorName:
3960    AddSourceLocation(
3961     SourceLocation::getFromRawEncoding(DNLoc.CXXLiteralOperatorName.OpNameLoc),
3962     Record);
3963    break;
3964
3965  case DeclarationName::Identifier:
3966  case DeclarationName::ObjCZeroArgSelector:
3967  case DeclarationName::ObjCOneArgSelector:
3968  case DeclarationName::ObjCMultiArgSelector:
3969  case DeclarationName::CXXUsingDirective:
3970    break;
3971  }
3972}
3973
3974void ASTWriter::AddDeclarationNameInfo(const DeclarationNameInfo &NameInfo,
3975                                       RecordDataImpl &Record) {
3976  AddDeclarationName(NameInfo.getName(), Record);
3977  AddSourceLocation(NameInfo.getLoc(), Record);
3978  AddDeclarationNameLoc(NameInfo.getInfo(), NameInfo.getName(), Record);
3979}
3980
3981void ASTWriter::AddQualifierInfo(const QualifierInfo &Info,
3982                                 RecordDataImpl &Record) {
3983  AddNestedNameSpecifierLoc(Info.QualifierLoc, Record);
3984  Record.push_back(Info.NumTemplParamLists);
3985  for (unsigned i=0, e=Info.NumTemplParamLists; i != e; ++i)
3986    AddTemplateParameterList(Info.TemplParamLists[i], Record);
3987}
3988
3989void ASTWriter::AddNestedNameSpecifier(NestedNameSpecifier *NNS,
3990                                       RecordDataImpl &Record) {
3991  // Nested name specifiers usually aren't too long. I think that 8 would
3992  // typically accommodate the vast majority.
3993  SmallVector<NestedNameSpecifier *, 8> NestedNames;
3994
3995  // Push each of the NNS's onto a stack for serialization in reverse order.
3996  while (NNS) {
3997    NestedNames.push_back(NNS);
3998    NNS = NNS->getPrefix();
3999  }
4000
4001  Record.push_back(NestedNames.size());
4002  while(!NestedNames.empty()) {
4003    NNS = NestedNames.pop_back_val();
4004    NestedNameSpecifier::SpecifierKind Kind = NNS->getKind();
4005    Record.push_back(Kind);
4006    switch (Kind) {
4007    case NestedNameSpecifier::Identifier:
4008      AddIdentifierRef(NNS->getAsIdentifier(), Record);
4009      break;
4010
4011    case NestedNameSpecifier::Namespace:
4012      AddDeclRef(NNS->getAsNamespace(), Record);
4013      break;
4014
4015    case NestedNameSpecifier::NamespaceAlias:
4016      AddDeclRef(NNS->getAsNamespaceAlias(), Record);
4017      break;
4018
4019    case NestedNameSpecifier::TypeSpec:
4020    case NestedNameSpecifier::TypeSpecWithTemplate:
4021      AddTypeRef(QualType(NNS->getAsType(), 0), Record);
4022      Record.push_back(Kind == NestedNameSpecifier::TypeSpecWithTemplate);
4023      break;
4024
4025    case NestedNameSpecifier::Global:
4026      // Don't need to write an associated value.
4027      break;
4028    }
4029  }
4030}
4031
4032void ASTWriter::AddNestedNameSpecifierLoc(NestedNameSpecifierLoc NNS,
4033                                          RecordDataImpl &Record) {
4034  // Nested name specifiers usually aren't too long. I think that 8 would
4035  // typically accommodate the vast majority.
4036  SmallVector<NestedNameSpecifierLoc , 8> NestedNames;
4037
4038  // Push each of the nested-name-specifiers's onto a stack for
4039  // serialization in reverse order.
4040  while (NNS) {
4041    NestedNames.push_back(NNS);
4042    NNS = NNS.getPrefix();
4043  }
4044
4045  Record.push_back(NestedNames.size());
4046  while(!NestedNames.empty()) {
4047    NNS = NestedNames.pop_back_val();
4048    NestedNameSpecifier::SpecifierKind Kind
4049      = NNS.getNestedNameSpecifier()->getKind();
4050    Record.push_back(Kind);
4051    switch (Kind) {
4052    case NestedNameSpecifier::Identifier:
4053      AddIdentifierRef(NNS.getNestedNameSpecifier()->getAsIdentifier(), Record);
4054      AddSourceRange(NNS.getLocalSourceRange(), Record);
4055      break;
4056
4057    case NestedNameSpecifier::Namespace:
4058      AddDeclRef(NNS.getNestedNameSpecifier()->getAsNamespace(), Record);
4059      AddSourceRange(NNS.getLocalSourceRange(), Record);
4060      break;
4061
4062    case NestedNameSpecifier::NamespaceAlias:
4063      AddDeclRef(NNS.getNestedNameSpecifier()->getAsNamespaceAlias(), Record);
4064      AddSourceRange(NNS.getLocalSourceRange(), Record);
4065      break;
4066
4067    case NestedNameSpecifier::TypeSpec:
4068    case NestedNameSpecifier::TypeSpecWithTemplate:
4069      Record.push_back(Kind == NestedNameSpecifier::TypeSpecWithTemplate);
4070      AddTypeLoc(NNS.getTypeLoc(), Record);
4071      AddSourceLocation(NNS.getLocalSourceRange().getEnd(), Record);
4072      break;
4073
4074    case NestedNameSpecifier::Global:
4075      AddSourceLocation(NNS.getLocalSourceRange().getEnd(), Record);
4076      break;
4077    }
4078  }
4079}
4080
4081void ASTWriter::AddTemplateName(TemplateName Name, RecordDataImpl &Record) {
4082  TemplateName::NameKind Kind = Name.getKind();
4083  Record.push_back(Kind);
4084  switch (Kind) {
4085  case TemplateName::Template:
4086    AddDeclRef(Name.getAsTemplateDecl(), Record);
4087    break;
4088
4089  case TemplateName::OverloadedTemplate: {
4090    OverloadedTemplateStorage *OvT = Name.getAsOverloadedTemplate();
4091    Record.push_back(OvT->size());
4092    for (OverloadedTemplateStorage::iterator I = OvT->begin(), E = OvT->end();
4093           I != E; ++I)
4094      AddDeclRef(*I, Record);
4095    break;
4096  }
4097
4098  case TemplateName::QualifiedTemplate: {
4099    QualifiedTemplateName *QualT = Name.getAsQualifiedTemplateName();
4100    AddNestedNameSpecifier(QualT->getQualifier(), Record);
4101    Record.push_back(QualT->hasTemplateKeyword());
4102    AddDeclRef(QualT->getTemplateDecl(), Record);
4103    break;
4104  }
4105
4106  case TemplateName::DependentTemplate: {
4107    DependentTemplateName *DepT = Name.getAsDependentTemplateName();
4108    AddNestedNameSpecifier(DepT->getQualifier(), Record);
4109    Record.push_back(DepT->isIdentifier());
4110    if (DepT->isIdentifier())
4111      AddIdentifierRef(DepT->getIdentifier(), Record);
4112    else
4113      Record.push_back(DepT->getOperator());
4114    break;
4115  }
4116
4117  case TemplateName::SubstTemplateTemplateParm: {
4118    SubstTemplateTemplateParmStorage *subst
4119      = Name.getAsSubstTemplateTemplateParm();
4120    AddDeclRef(subst->getParameter(), Record);
4121    AddTemplateName(subst->getReplacement(), Record);
4122    break;
4123  }
4124
4125  case TemplateName::SubstTemplateTemplateParmPack: {
4126    SubstTemplateTemplateParmPackStorage *SubstPack
4127      = Name.getAsSubstTemplateTemplateParmPack();
4128    AddDeclRef(SubstPack->getParameterPack(), Record);
4129    AddTemplateArgument(SubstPack->getArgumentPack(), Record);
4130    break;
4131  }
4132  }
4133}
4134
4135void ASTWriter::AddTemplateArgument(const TemplateArgument &Arg,
4136                                    RecordDataImpl &Record) {
4137  Record.push_back(Arg.getKind());
4138  switch (Arg.getKind()) {
4139  case TemplateArgument::Null:
4140    break;
4141  case TemplateArgument::Type:
4142    AddTypeRef(Arg.getAsType(), Record);
4143    break;
4144  case TemplateArgument::Declaration:
4145    AddDeclRef(Arg.getAsDecl(), Record);
4146    break;
4147  case TemplateArgument::Integral:
4148    AddAPSInt(*Arg.getAsIntegral(), Record);
4149    AddTypeRef(Arg.getIntegralType(), Record);
4150    break;
4151  case TemplateArgument::Template:
4152    AddTemplateName(Arg.getAsTemplateOrTemplatePattern(), Record);
4153    break;
4154  case TemplateArgument::TemplateExpansion:
4155    AddTemplateName(Arg.getAsTemplateOrTemplatePattern(), Record);
4156    if (llvm::Optional<unsigned> NumExpansions = Arg.getNumTemplateExpansions())
4157      Record.push_back(*NumExpansions + 1);
4158    else
4159      Record.push_back(0);
4160    break;
4161  case TemplateArgument::Expression:
4162    AddStmt(Arg.getAsExpr());
4163    break;
4164  case TemplateArgument::Pack:
4165    Record.push_back(Arg.pack_size());
4166    for (TemplateArgument::pack_iterator I=Arg.pack_begin(), E=Arg.pack_end();
4167           I != E; ++I)
4168      AddTemplateArgument(*I, Record);
4169    break;
4170  }
4171}
4172
4173void
4174ASTWriter::AddTemplateParameterList(const TemplateParameterList *TemplateParams,
4175                                    RecordDataImpl &Record) {
4176  assert(TemplateParams && "No TemplateParams!");
4177  AddSourceLocation(TemplateParams->getTemplateLoc(), Record);
4178  AddSourceLocation(TemplateParams->getLAngleLoc(), Record);
4179  AddSourceLocation(TemplateParams->getRAngleLoc(), Record);
4180  Record.push_back(TemplateParams->size());
4181  for (TemplateParameterList::const_iterator
4182         P = TemplateParams->begin(), PEnd = TemplateParams->end();
4183         P != PEnd; ++P)
4184    AddDeclRef(*P, Record);
4185}
4186
4187/// \brief Emit a template argument list.
4188void
4189ASTWriter::AddTemplateArgumentList(const TemplateArgumentList *TemplateArgs,
4190                                   RecordDataImpl &Record) {
4191  assert(TemplateArgs && "No TemplateArgs!");
4192  Record.push_back(TemplateArgs->size());
4193  for (int i=0, e = TemplateArgs->size(); i != e; ++i)
4194    AddTemplateArgument(TemplateArgs->get(i), Record);
4195}
4196
4197
4198void
4199ASTWriter::AddUnresolvedSet(const UnresolvedSetImpl &Set, RecordDataImpl &Record) {
4200  Record.push_back(Set.size());
4201  for (UnresolvedSetImpl::const_iterator
4202         I = Set.begin(), E = Set.end(); I != E; ++I) {
4203    AddDeclRef(I.getDecl(), Record);
4204    Record.push_back(I.getAccess());
4205  }
4206}
4207
4208void ASTWriter::AddCXXBaseSpecifier(const CXXBaseSpecifier &Base,
4209                                    RecordDataImpl &Record) {
4210  Record.push_back(Base.isVirtual());
4211  Record.push_back(Base.isBaseOfClass());
4212  Record.push_back(Base.getAccessSpecifierAsWritten());
4213  Record.push_back(Base.getInheritConstructors());
4214  AddTypeSourceInfo(Base.getTypeSourceInfo(), Record);
4215  AddSourceRange(Base.getSourceRange(), Record);
4216  AddSourceLocation(Base.isPackExpansion()? Base.getEllipsisLoc()
4217                                          : SourceLocation(),
4218                    Record);
4219}
4220
4221void ASTWriter::FlushCXXBaseSpecifiers() {
4222  RecordData Record;
4223  for (unsigned I = 0, N = CXXBaseSpecifiersToWrite.size(); I != N; ++I) {
4224    Record.clear();
4225
4226    // Record the offset of this base-specifier set.
4227    unsigned Index = CXXBaseSpecifiersToWrite[I].ID - 1;
4228    if (Index == CXXBaseSpecifiersOffsets.size())
4229      CXXBaseSpecifiersOffsets.push_back(Stream.GetCurrentBitNo());
4230    else {
4231      if (Index > CXXBaseSpecifiersOffsets.size())
4232        CXXBaseSpecifiersOffsets.resize(Index + 1);
4233      CXXBaseSpecifiersOffsets[Index] = Stream.GetCurrentBitNo();
4234    }
4235
4236    const CXXBaseSpecifier *B = CXXBaseSpecifiersToWrite[I].Bases,
4237                        *BEnd = CXXBaseSpecifiersToWrite[I].BasesEnd;
4238    Record.push_back(BEnd - B);
4239    for (; B != BEnd; ++B)
4240      AddCXXBaseSpecifier(*B, Record);
4241    Stream.EmitRecord(serialization::DECL_CXX_BASE_SPECIFIERS, Record);
4242
4243    // Flush any expressions that were written as part of the base specifiers.
4244    FlushStmts();
4245  }
4246
4247  CXXBaseSpecifiersToWrite.clear();
4248}
4249
4250void ASTWriter::AddCXXCtorInitializers(
4251                             const CXXCtorInitializer * const *CtorInitializers,
4252                             unsigned NumCtorInitializers,
4253                             RecordDataImpl &Record) {
4254  Record.push_back(NumCtorInitializers);
4255  for (unsigned i=0; i != NumCtorInitializers; ++i) {
4256    const CXXCtorInitializer *Init = CtorInitializers[i];
4257
4258    if (Init->isBaseInitializer()) {
4259      Record.push_back(CTOR_INITIALIZER_BASE);
4260      AddTypeSourceInfo(Init->getTypeSourceInfo(), Record);
4261      Record.push_back(Init->isBaseVirtual());
4262    } else if (Init->isDelegatingInitializer()) {
4263      Record.push_back(CTOR_INITIALIZER_DELEGATING);
4264      AddTypeSourceInfo(Init->getTypeSourceInfo(), Record);
4265    } else if (Init->isMemberInitializer()){
4266      Record.push_back(CTOR_INITIALIZER_MEMBER);
4267      AddDeclRef(Init->getMember(), Record);
4268    } else {
4269      Record.push_back(CTOR_INITIALIZER_INDIRECT_MEMBER);
4270      AddDeclRef(Init->getIndirectMember(), Record);
4271    }
4272
4273    AddSourceLocation(Init->getMemberLocation(), Record);
4274    AddStmt(Init->getInit());
4275    AddSourceLocation(Init->getLParenLoc(), Record);
4276    AddSourceLocation(Init->getRParenLoc(), Record);
4277    Record.push_back(Init->isWritten());
4278    if (Init->isWritten()) {
4279      Record.push_back(Init->getSourceOrder());
4280    } else {
4281      Record.push_back(Init->getNumArrayIndices());
4282      for (unsigned i=0, e=Init->getNumArrayIndices(); i != e; ++i)
4283        AddDeclRef(Init->getArrayIndex(i), Record);
4284    }
4285  }
4286}
4287
4288void ASTWriter::AddCXXDefinitionData(const CXXRecordDecl *D, RecordDataImpl &Record) {
4289  assert(D->DefinitionData);
4290  struct CXXRecordDecl::DefinitionData &Data = *D->DefinitionData;
4291  Record.push_back(Data.IsLambda);
4292  Record.push_back(Data.UserDeclaredConstructor);
4293  Record.push_back(Data.UserDeclaredCopyConstructor);
4294  Record.push_back(Data.UserDeclaredMoveConstructor);
4295  Record.push_back(Data.UserDeclaredCopyAssignment);
4296  Record.push_back(Data.UserDeclaredMoveAssignment);
4297  Record.push_back(Data.UserDeclaredDestructor);
4298  Record.push_back(Data.Aggregate);
4299  Record.push_back(Data.PlainOldData);
4300  Record.push_back(Data.Empty);
4301  Record.push_back(Data.Polymorphic);
4302  Record.push_back(Data.Abstract);
4303  Record.push_back(Data.IsStandardLayout);
4304  Record.push_back(Data.HasNoNonEmptyBases);
4305  Record.push_back(Data.HasPrivateFields);
4306  Record.push_back(Data.HasProtectedFields);
4307  Record.push_back(Data.HasPublicFields);
4308  Record.push_back(Data.HasMutableFields);
4309  Record.push_back(Data.HasOnlyCMembers);
4310  Record.push_back(Data.HasTrivialDefaultConstructor);
4311  Record.push_back(Data.HasConstexprNonCopyMoveConstructor);
4312  Record.push_back(Data.DefaultedDefaultConstructorIsConstexpr);
4313  Record.push_back(Data.DefaultedCopyConstructorIsConstexpr);
4314  Record.push_back(Data.DefaultedMoveConstructorIsConstexpr);
4315  Record.push_back(Data.HasConstexprDefaultConstructor);
4316  Record.push_back(Data.HasConstexprCopyConstructor);
4317  Record.push_back(Data.HasConstexprMoveConstructor);
4318  Record.push_back(Data.HasTrivialCopyConstructor);
4319  Record.push_back(Data.HasTrivialMoveConstructor);
4320  Record.push_back(Data.HasTrivialCopyAssignment);
4321  Record.push_back(Data.HasTrivialMoveAssignment);
4322  Record.push_back(Data.HasTrivialDestructor);
4323  Record.push_back(Data.HasIrrelevantDestructor);
4324  Record.push_back(Data.HasNonLiteralTypeFieldsOrBases);
4325  Record.push_back(Data.ComputedVisibleConversions);
4326  Record.push_back(Data.UserProvidedDefaultConstructor);
4327  Record.push_back(Data.DeclaredDefaultConstructor);
4328  Record.push_back(Data.DeclaredCopyConstructor);
4329  Record.push_back(Data.DeclaredMoveConstructor);
4330  Record.push_back(Data.DeclaredCopyAssignment);
4331  Record.push_back(Data.DeclaredMoveAssignment);
4332  Record.push_back(Data.DeclaredDestructor);
4333  Record.push_back(Data.FailedImplicitMoveConstructor);
4334  Record.push_back(Data.FailedImplicitMoveAssignment);
4335  // IsLambda bit is already saved.
4336
4337  Record.push_back(Data.NumBases);
4338  if (Data.NumBases > 0)
4339    AddCXXBaseSpecifiersRef(Data.getBases(), Data.getBases() + Data.NumBases,
4340                            Record);
4341
4342  // FIXME: Make VBases lazily computed when needed to avoid storing them.
4343  Record.push_back(Data.NumVBases);
4344  if (Data.NumVBases > 0)
4345    AddCXXBaseSpecifiersRef(Data.getVBases(), Data.getVBases() + Data.NumVBases,
4346                            Record);
4347
4348  AddUnresolvedSet(Data.Conversions, Record);
4349  AddUnresolvedSet(Data.VisibleConversions, Record);
4350  // Data.Definition is the owning decl, no need to write it.
4351  AddDeclRef(Data.FirstFriend, Record);
4352
4353  // Add lambda-specific data.
4354  if (Data.IsLambda) {
4355    CXXRecordDecl::LambdaDefinitionData &Lambda = D->getLambdaData();
4356    Record.push_back(Lambda.Dependent);
4357    Record.push_back(Lambda.NumCaptures);
4358    Record.push_back(Lambda.NumExplicitCaptures);
4359    Record.push_back(Lambda.ManglingNumber);
4360    AddDeclRef(Lambda.ContextDecl, Record);
4361    for (unsigned I = 0, N = Lambda.NumCaptures; I != N; ++I) {
4362      LambdaExpr::Capture &Capture = Lambda.Captures[I];
4363      AddSourceLocation(Capture.getLocation(), Record);
4364      Record.push_back(Capture.isImplicit());
4365      Record.push_back(Capture.getCaptureKind()); // FIXME: stable!
4366      VarDecl *Var = Capture.capturesVariable()? Capture.getCapturedVar() : 0;
4367      AddDeclRef(Var, Record);
4368      AddSourceLocation(Capture.isPackExpansion()? Capture.getEllipsisLoc()
4369                                                 : SourceLocation(),
4370                        Record);
4371    }
4372  }
4373}
4374
4375void ASTWriter::ReaderInitialized(ASTReader *Reader) {
4376  assert(Reader && "Cannot remove chain");
4377  assert((!Chain || Chain == Reader) && "Cannot replace chain");
4378  assert(FirstDeclID == NextDeclID &&
4379         FirstTypeID == NextTypeID &&
4380         FirstIdentID == NextIdentID &&
4381         FirstSubmoduleID == NextSubmoduleID &&
4382         FirstSelectorID == NextSelectorID &&
4383         "Setting chain after writing has started.");
4384
4385  Chain = Reader;
4386
4387  FirstDeclID = NUM_PREDEF_DECL_IDS + Chain->getTotalNumDecls();
4388  FirstTypeID = NUM_PREDEF_TYPE_IDS + Chain->getTotalNumTypes();
4389  FirstIdentID = NUM_PREDEF_IDENT_IDS + Chain->getTotalNumIdentifiers();
4390  FirstSubmoduleID = NUM_PREDEF_SUBMODULE_IDS + Chain->getTotalNumSubmodules();
4391  FirstSelectorID = NUM_PREDEF_SELECTOR_IDS + Chain->getTotalNumSelectors();
4392  NextDeclID = FirstDeclID;
4393  NextTypeID = FirstTypeID;
4394  NextIdentID = FirstIdentID;
4395  NextSelectorID = FirstSelectorID;
4396  NextSubmoduleID = FirstSubmoduleID;
4397}
4398
4399void ASTWriter::IdentifierRead(IdentID ID, IdentifierInfo *II) {
4400  IdentifierIDs[II] = ID;
4401  if (II->hasMacroDefinition())
4402    DeserializedMacroNames.push_back(II);
4403}
4404
4405void ASTWriter::TypeRead(TypeIdx Idx, QualType T) {
4406  // Always take the highest-numbered type index. This copes with an interesting
4407  // case for chained AST writing where we schedule writing the type and then,
4408  // later, deserialize the type from another AST. In this case, we want to
4409  // keep the higher-numbered entry so that we can properly write it out to
4410  // the AST file.
4411  TypeIdx &StoredIdx = TypeIdxs[T];
4412  if (Idx.getIndex() >= StoredIdx.getIndex())
4413    StoredIdx = Idx;
4414}
4415
4416void ASTWriter::SelectorRead(SelectorID ID, Selector S) {
4417  SelectorIDs[S] = ID;
4418}
4419
4420void ASTWriter::MacroDefinitionRead(serialization::PreprocessedEntityID ID,
4421                                    MacroDefinition *MD) {
4422  assert(MacroDefinitions.find(MD) == MacroDefinitions.end());
4423  MacroDefinitions[MD] = ID;
4424}
4425
4426void ASTWriter::MacroVisible(IdentifierInfo *II) {
4427  DeserializedMacroNames.push_back(II);
4428}
4429
4430void ASTWriter::ModuleRead(serialization::SubmoduleID ID, Module *Mod) {
4431  assert(SubmoduleIDs.find(Mod) == SubmoduleIDs.end());
4432  SubmoduleIDs[Mod] = ID;
4433}
4434
4435void ASTWriter::CompletedTagDefinition(const TagDecl *D) {
4436  assert(D->isCompleteDefinition());
4437  assert(!WritingAST && "Already writing the AST!");
4438  if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D)) {
4439    // We are interested when a PCH decl is modified.
4440    if (RD->isFromASTFile()) {
4441      // A forward reference was mutated into a definition. Rewrite it.
4442      // FIXME: This happens during template instantiation, should we
4443      // have created a new definition decl instead ?
4444      RewriteDecl(RD);
4445    }
4446  }
4447}
4448void ASTWriter::AddedVisibleDecl(const DeclContext *DC, const Decl *D) {
4449  assert(!WritingAST && "Already writing the AST!");
4450
4451  // TU and namespaces are handled elsewhere.
4452  if (isa<TranslationUnitDecl>(DC) || isa<NamespaceDecl>(DC))
4453    return;
4454
4455  if (!(!D->isFromASTFile() && cast<Decl>(DC)->isFromASTFile()))
4456    return; // Not a source decl added to a DeclContext from PCH.
4457
4458  AddUpdatedDeclContext(DC);
4459}
4460
4461void ASTWriter::AddedCXXImplicitMember(const CXXRecordDecl *RD, const Decl *D) {
4462  assert(!WritingAST && "Already writing the AST!");
4463  assert(D->isImplicit());
4464  if (!(!D->isFromASTFile() && RD->isFromASTFile()))
4465    return; // Not a source member added to a class from PCH.
4466  if (!isa<CXXMethodDecl>(D))
4467    return; // We are interested in lazily declared implicit methods.
4468
4469  // A decl coming from PCH was modified.
4470  assert(RD->isCompleteDefinition());
4471  UpdateRecord &Record = DeclUpdates[RD];
4472  Record.push_back(UPD_CXX_ADDED_IMPLICIT_MEMBER);
4473  Record.push_back(reinterpret_cast<uint64_t>(D));
4474}
4475
4476void ASTWriter::AddedCXXTemplateSpecialization(const ClassTemplateDecl *TD,
4477                                     const ClassTemplateSpecializationDecl *D) {
4478  // The specializations set is kept in the canonical template.
4479  assert(!WritingAST && "Already writing the AST!");
4480  TD = TD->getCanonicalDecl();
4481  if (!(!D->isFromASTFile() && TD->isFromASTFile()))
4482    return; // Not a source specialization added to a template from PCH.
4483
4484  UpdateRecord &Record = DeclUpdates[TD];
4485  Record.push_back(UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION);
4486  Record.push_back(reinterpret_cast<uint64_t>(D));
4487}
4488
4489void ASTWriter::AddedCXXTemplateSpecialization(const FunctionTemplateDecl *TD,
4490                                               const FunctionDecl *D) {
4491  // The specializations set is kept in the canonical template.
4492  assert(!WritingAST && "Already writing the AST!");
4493  TD = TD->getCanonicalDecl();
4494  if (!(!D->isFromASTFile() && TD->isFromASTFile()))
4495    return; // Not a source specialization added to a template from PCH.
4496
4497  UpdateRecord &Record = DeclUpdates[TD];
4498  Record.push_back(UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION);
4499  Record.push_back(reinterpret_cast<uint64_t>(D));
4500}
4501
4502void ASTWriter::CompletedImplicitDefinition(const FunctionDecl *D) {
4503  assert(!WritingAST && "Already writing the AST!");
4504  if (!D->isFromASTFile())
4505    return; // Declaration not imported from PCH.
4506
4507  // Implicit decl from a PCH was defined.
4508  // FIXME: Should implicit definition be a separate FunctionDecl?
4509  RewriteDecl(D);
4510}
4511
4512void ASTWriter::StaticDataMemberInstantiated(const VarDecl *D) {
4513  assert(!WritingAST && "Already writing the AST!");
4514  if (!D->isFromASTFile())
4515    return;
4516
4517  // Since the actual instantiation is delayed, this really means that we need
4518  // to update the instantiation location.
4519  UpdateRecord &Record = DeclUpdates[D];
4520  Record.push_back(UPD_CXX_INSTANTIATED_STATIC_DATA_MEMBER);
4521  AddSourceLocation(
4522      D->getMemberSpecializationInfo()->getPointOfInstantiation(), Record);
4523}
4524
4525void ASTWriter::AddedObjCCategoryToInterface(const ObjCCategoryDecl *CatD,
4526                                             const ObjCInterfaceDecl *IFD) {
4527  assert(!WritingAST && "Already writing the AST!");
4528  if (!IFD->isFromASTFile())
4529    return; // Declaration not imported from PCH.
4530
4531  assert(IFD->getDefinition() && "Category on a class without a definition?");
4532  ObjCClassesWithCategories.insert(
4533    const_cast<ObjCInterfaceDecl *>(IFD->getDefinition()));
4534}
4535
4536
4537void ASTWriter::AddedObjCPropertyInClassExtension(const ObjCPropertyDecl *Prop,
4538                                          const ObjCPropertyDecl *OrigProp,
4539                                          const ObjCCategoryDecl *ClassExt) {
4540  const ObjCInterfaceDecl *D = ClassExt->getClassInterface();
4541  if (!D)
4542    return;
4543
4544  assert(!WritingAST && "Already writing the AST!");
4545  if (!D->isFromASTFile())
4546    return; // Declaration not imported from PCH.
4547
4548  RewriteDecl(D);
4549}
4550