ASTWriterDecl.cpp revision 099e7f647ccda915513f2b2ec53352dc756082d3 
1//===--- ASTWriterDecl.cpp - Declaration Serialization --------------------===//
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 implements serialization for Declarations.
11//
12//===----------------------------------------------------------------------===//
13
14#include "clang/Serialization/ASTWriter.h"
15#include "ASTCommon.h"
16#include "clang/AST/DeclVisitor.h"
17#include "clang/AST/DeclCXX.h"
18#include "clang/AST/DeclTemplate.h"
19#include "clang/AST/Expr.h"
20#include "clang/AST/DeclContextInternals.h"
21#include "clang/Basic/SourceManager.h"
22#include "llvm/ADT/Twine.h"
23#include "llvm/Bitcode/BitstreamWriter.h"
24#include "llvm/Support/ErrorHandling.h"
25using namespace clang;
26using namespace serialization;
27
28//===----------------------------------------------------------------------===//
29// Declaration serialization
30//===----------------------------------------------------------------------===//
31
32namespace clang {
33  class ASTDeclWriter : public DeclVisitor<ASTDeclWriter, void> {
34
35    ASTWriter &Writer;
36    ASTContext &Context;
37    typedef ASTWriter::RecordData RecordData;
38    RecordData &Record;
39
40  public:
41    serialization::DeclCode Code;
42    unsigned AbbrevToUse;
43
44    ASTDeclWriter(ASTWriter &Writer, ASTContext &Context, RecordData &Record)
45      : Writer(Writer), Context(Context), Record(Record) {
46    }
47
48    void Visit(Decl *D);
49
50    void VisitDecl(Decl *D);
51    void VisitTranslationUnitDecl(TranslationUnitDecl *D);
52    void VisitNamedDecl(NamedDecl *D);
53    void VisitLabelDecl(LabelDecl *LD);
54    void VisitNamespaceDecl(NamespaceDecl *D);
55    void VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
56    void VisitNamespaceAliasDecl(NamespaceAliasDecl *D);
57    void VisitTypeDecl(TypeDecl *D);
58    void VisitTypedefDecl(TypedefDecl *D);
59    void VisitTypeAliasDecl(TypeAliasDecl *D);
60    void VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
61    void VisitTagDecl(TagDecl *D);
62    void VisitEnumDecl(EnumDecl *D);
63    void VisitRecordDecl(RecordDecl *D);
64    void VisitCXXRecordDecl(CXXRecordDecl *D);
65    void VisitClassTemplateSpecializationDecl(
66                                            ClassTemplateSpecializationDecl *D);
67    void VisitClassTemplatePartialSpecializationDecl(
68                                     ClassTemplatePartialSpecializationDecl *D);
69    void VisitClassScopeFunctionSpecializationDecl(
70                                       ClassScopeFunctionSpecializationDecl *D);
71    void VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D);
72    void VisitValueDecl(ValueDecl *D);
73    void VisitEnumConstantDecl(EnumConstantDecl *D);
74    void VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
75    void VisitDeclaratorDecl(DeclaratorDecl *D);
76    void VisitFunctionDecl(FunctionDecl *D);
77    void VisitCXXMethodDecl(CXXMethodDecl *D);
78    void VisitCXXConstructorDecl(CXXConstructorDecl *D);
79    void VisitCXXDestructorDecl(CXXDestructorDecl *D);
80    void VisitCXXConversionDecl(CXXConversionDecl *D);
81    void VisitFieldDecl(FieldDecl *D);
82    void VisitIndirectFieldDecl(IndirectFieldDecl *D);
83    void VisitVarDecl(VarDecl *D);
84    void VisitImplicitParamDecl(ImplicitParamDecl *D);
85    void VisitParmVarDecl(ParmVarDecl *D);
86    void VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D);
87    void VisitTemplateDecl(TemplateDecl *D);
88    void VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D);
89    void VisitClassTemplateDecl(ClassTemplateDecl *D);
90    void VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
91    void VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D);
92    void VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D);
93    void VisitUsingDecl(UsingDecl *D);
94    void VisitUsingShadowDecl(UsingShadowDecl *D);
95    void VisitLinkageSpecDecl(LinkageSpecDecl *D);
96    void VisitFileScopeAsmDecl(FileScopeAsmDecl *D);
97    void VisitImportDecl(ImportDecl *D);
98    void VisitAccessSpecDecl(AccessSpecDecl *D);
99    void VisitFriendDecl(FriendDecl *D);
100    void VisitFriendTemplateDecl(FriendTemplateDecl *D);
101    void VisitStaticAssertDecl(StaticAssertDecl *D);
102    void VisitBlockDecl(BlockDecl *D);
103
104    void VisitDeclContext(DeclContext *DC, uint64_t LexicalOffset,
105                          uint64_t VisibleOffset);
106    template <typename T> void VisitRedeclarable(Redeclarable<T> *D);
107
108
109    // FIXME: Put in the same order is DeclNodes.td?
110    void VisitObjCMethodDecl(ObjCMethodDecl *D);
111    void VisitObjCContainerDecl(ObjCContainerDecl *D);
112    void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
113    void VisitObjCIvarDecl(ObjCIvarDecl *D);
114    void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
115    void VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D);
116    void VisitObjCClassDecl(ObjCClassDecl *D);
117    void VisitObjCForwardProtocolDecl(ObjCForwardProtocolDecl *D);
118    void VisitObjCCategoryDecl(ObjCCategoryDecl *D);
119    void VisitObjCImplDecl(ObjCImplDecl *D);
120    void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
121    void VisitObjCImplementationDecl(ObjCImplementationDecl *D);
122    void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D);
123    void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
124    void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
125  };
126}
127
128static bool isFirstDeclInFile(Decl *D) {
129  // FIXME: There must be a better way to abstract Redeclarable<T> into a
130  // more-general "redeclarable type".
131  if (TagDecl *Tag = dyn_cast<TagDecl>(D))
132    return !Tag->getPreviousDeclaration() ||
133           Tag->getPreviousDeclaration()->isFromASTFile();
134  if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D))
135    return !FD->getPreviousDeclaration() ||
136           FD->getPreviousDeclaration()->isFromASTFile();
137  if (VarDecl *VD = dyn_cast<VarDecl>(D))
138    return !VD->getPreviousDeclaration() ||
139           VD->getPreviousDeclaration()->isFromASTFile();
140  if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(D))
141    return !TD->getPreviousDeclaration() ||
142           TD->getPreviousDeclaration()->isFromASTFile();
143  if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(D))
144    return !ID->getPreviousDeclaration() ||
145            ID->getPreviousDeclaration()->isFromASTFile();
146
147  RedeclarableTemplateDecl *RTD = cast<RedeclarableTemplateDecl>(D);
148  return !RTD->getPreviousDeclaration() ||
149          RTD->getPreviousDeclaration()->isFromASTFile();
150}
151
152void ASTDeclWriter::Visit(Decl *D) {
153  DeclVisitor<ASTDeclWriter>::Visit(D);
154
155  // Source locations require array (variable-length) abbreviations.  The
156  // abbreviation infrastructure requires that arrays are encoded last, so
157  // we handle it here in the case of those classes derived from DeclaratorDecl
158  if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)){
159    Writer.AddTypeSourceInfo(DD->getTypeSourceInfo(), Record);
160  }
161
162  // Handle FunctionDecl's body here and write it after all other Stmts/Exprs
163  // have been written. We want it last because we will not read it back when
164  // retrieving it from the AST, we'll just lazily set the offset.
165  if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
166    Record.push_back(FD->doesThisDeclarationHaveABody());
167    if (FD->doesThisDeclarationHaveABody())
168      Writer.AddStmt(FD->getBody());
169  }
170}
171
172void ASTDeclWriter::VisitDecl(Decl *D) {
173  Writer.AddDeclRef(cast_or_null<Decl>(D->getDeclContext()), Record);
174  Writer.AddDeclRef(cast_or_null<Decl>(D->getLexicalDeclContext()), Record);
175  Record.push_back(D->isInvalidDecl());
176  Record.push_back(D->hasAttrs());
177  if (D->hasAttrs())
178    Writer.WriteAttributes(D->getAttrs(), Record);
179  Record.push_back(D->isImplicit());
180  Record.push_back(D->isUsed(false));
181  Record.push_back(D->isReferenced());
182  Record.push_back(D->TopLevelDeclInObjCContainer);
183  Record.push_back(D->getAccess());
184  Record.push_back(D->ModulePrivate);
185  Record.push_back(Writer.inferSubmoduleIDFromLocation(D->getLocation()));
186}
187
188void ASTDeclWriter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
189  llvm_unreachable("Translation units aren't directly serialized");
190}
191
192void ASTDeclWriter::VisitNamedDecl(NamedDecl *D) {
193  VisitDecl(D);
194  Writer.AddDeclarationName(D->getDeclName(), Record);
195}
196
197void ASTDeclWriter::VisitTypeDecl(TypeDecl *D) {
198  VisitNamedDecl(D);
199  Writer.AddSourceLocation(D->getLocStart(), Record);
200  Writer.AddTypeRef(QualType(D->getTypeForDecl(), 0), Record);
201}
202
203void ASTDeclWriter::VisitTypedefDecl(TypedefDecl *D) {
204  VisitRedeclarable(D);
205  VisitTypeDecl(D);
206  Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record);
207
208  if (!D->hasAttrs() &&
209      !D->isImplicit() &&
210      !D->isUsed(false) &&
211      isFirstDeclInFile(D) &&
212      !D->isInvalidDecl() &&
213      !D->isReferenced() &&
214      !D->isTopLevelDeclInObjCContainer() &&
215      D->getAccess() == AS_none &&
216      !D->isModulePrivate() &&
217      D->getDeclName().getNameKind() == DeclarationName::Identifier)
218    AbbrevToUse = Writer.getDeclTypedefAbbrev();
219
220  Code = serialization::DECL_TYPEDEF;
221}
222
223void ASTDeclWriter::VisitTypeAliasDecl(TypeAliasDecl *D) {
224  VisitRedeclarable(D);
225  VisitTypeDecl(D);
226  Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record);
227  Code = serialization::DECL_TYPEALIAS;
228}
229
230void ASTDeclWriter::VisitTagDecl(TagDecl *D) {
231  VisitRedeclarable(D);
232  VisitTypeDecl(D);
233  Record.push_back(D->getIdentifierNamespace());
234  Record.push_back((unsigned)D->getTagKind()); // FIXME: stable encoding
235  Record.push_back(D->isCompleteDefinition());
236  Record.push_back(D->isEmbeddedInDeclarator());
237  Record.push_back(D->isFreeStanding());
238  Writer.AddSourceLocation(D->getRBraceLoc(), Record);
239  Record.push_back(D->hasExtInfo());
240  if (D->hasExtInfo())
241    Writer.AddQualifierInfo(*D->getExtInfo(), Record);
242  else
243    Writer.AddDeclRef(D->getTypedefNameForAnonDecl(), Record);
244}
245
246void ASTDeclWriter::VisitEnumDecl(EnumDecl *D) {
247  VisitTagDecl(D);
248  Writer.AddTypeSourceInfo(D->getIntegerTypeSourceInfo(), Record);
249  if (!D->getIntegerTypeSourceInfo())
250    Writer.AddTypeRef(D->getIntegerType(), Record);
251  Writer.AddTypeRef(D->getPromotionType(), Record);
252  Record.push_back(D->getNumPositiveBits());
253  Record.push_back(D->getNumNegativeBits());
254  Record.push_back(D->isScoped());
255  Record.push_back(D->isScopedUsingClassTag());
256  Record.push_back(D->isFixed());
257  Writer.AddDeclRef(D->getInstantiatedFromMemberEnum(), Record);
258
259  if (!D->hasAttrs() &&
260      !D->isImplicit() &&
261      !D->isUsed(false) &&
262      !D->hasExtInfo() &&
263      isFirstDeclInFile(D) &&
264      !D->isInvalidDecl() &&
265      !D->isReferenced() &&
266      !D->isTopLevelDeclInObjCContainer() &&
267      D->getAccess() == AS_none &&
268      !D->isModulePrivate() &&
269      !CXXRecordDecl::classofKind(D->getKind()) &&
270      !D->getIntegerTypeSourceInfo() &&
271      D->getDeclName().getNameKind() == DeclarationName::Identifier)
272    AbbrevToUse = Writer.getDeclEnumAbbrev();
273
274  Code = serialization::DECL_ENUM;
275}
276
277void ASTDeclWriter::VisitRecordDecl(RecordDecl *D) {
278  VisitTagDecl(D);
279  Record.push_back(D->hasFlexibleArrayMember());
280  Record.push_back(D->isAnonymousStructOrUnion());
281  Record.push_back(D->hasObjectMember());
282
283  if (!D->hasAttrs() &&
284      !D->isImplicit() &&
285      !D->isUsed(false) &&
286      !D->hasExtInfo() &&
287      isFirstDeclInFile(D) &&
288      !D->isInvalidDecl() &&
289      !D->isReferenced() &&
290      !D->isTopLevelDeclInObjCContainer() &&
291      D->getAccess() == AS_none &&
292      !D->isModulePrivate() &&
293      !CXXRecordDecl::classofKind(D->getKind()) &&
294      D->getDeclName().getNameKind() == DeclarationName::Identifier)
295    AbbrevToUse = Writer.getDeclRecordAbbrev();
296
297  Code = serialization::DECL_RECORD;
298}
299
300void ASTDeclWriter::VisitValueDecl(ValueDecl *D) {
301  VisitNamedDecl(D);
302  Writer.AddTypeRef(D->getType(), Record);
303}
304
305void ASTDeclWriter::VisitEnumConstantDecl(EnumConstantDecl *D) {
306  VisitValueDecl(D);
307  Record.push_back(D->getInitExpr()? 1 : 0);
308  if (D->getInitExpr())
309    Writer.AddStmt(D->getInitExpr());
310  Writer.AddAPSInt(D->getInitVal(), Record);
311
312  Code = serialization::DECL_ENUM_CONSTANT;
313}
314
315void ASTDeclWriter::VisitDeclaratorDecl(DeclaratorDecl *D) {
316  VisitValueDecl(D);
317  Writer.AddSourceLocation(D->getInnerLocStart(), Record);
318  Record.push_back(D->hasExtInfo());
319  if (D->hasExtInfo())
320    Writer.AddQualifierInfo(*D->getExtInfo(), Record);
321}
322
323void ASTDeclWriter::VisitFunctionDecl(FunctionDecl *D) {
324  VisitRedeclarable(D);
325  VisitDeclaratorDecl(D);
326
327  Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
328  Record.push_back(D->getIdentifierNamespace());
329  Record.push_back(D->getTemplatedKind());
330  switch (D->getTemplatedKind()) {
331  default: llvm_unreachable("Unhandled TemplatedKind!");
332  case FunctionDecl::TK_NonTemplate:
333    break;
334  case FunctionDecl::TK_FunctionTemplate:
335    Writer.AddDeclRef(D->getDescribedFunctionTemplate(), Record);
336    break;
337  case FunctionDecl::TK_MemberSpecialization: {
338    MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo();
339    Writer.AddDeclRef(MemberInfo->getInstantiatedFrom(), Record);
340    Record.push_back(MemberInfo->getTemplateSpecializationKind());
341    Writer.AddSourceLocation(MemberInfo->getPointOfInstantiation(), Record);
342    break;
343  }
344  case FunctionDecl::TK_FunctionTemplateSpecialization: {
345    FunctionTemplateSpecializationInfo *
346      FTSInfo = D->getTemplateSpecializationInfo();
347    Writer.AddDeclRef(FTSInfo->getTemplate(), Record);
348    Record.push_back(FTSInfo->getTemplateSpecializationKind());
349
350    // Template arguments.
351    Writer.AddTemplateArgumentList(FTSInfo->TemplateArguments, Record);
352
353    // Template args as written.
354    Record.push_back(FTSInfo->TemplateArgumentsAsWritten != 0);
355    if (FTSInfo->TemplateArgumentsAsWritten) {
356      Record.push_back(FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs);
357      for (int i=0, e = FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs;
358             i!=e; ++i)
359        Writer.AddTemplateArgumentLoc((*FTSInfo->TemplateArgumentsAsWritten)[i],
360                                      Record);
361      Writer.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->LAngleLoc,
362                               Record);
363      Writer.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->RAngleLoc,
364                               Record);
365    }
366
367    Writer.AddSourceLocation(FTSInfo->getPointOfInstantiation(), Record);
368
369    if (D->isCanonicalDecl()) {
370      // Write the template that contains the specializations set. We will
371      // add a FunctionTemplateSpecializationInfo to it when reading.
372      Writer.AddDeclRef(FTSInfo->getTemplate()->getCanonicalDecl(), Record);
373    }
374    break;
375  }
376  case FunctionDecl::TK_DependentFunctionTemplateSpecialization: {
377    DependentFunctionTemplateSpecializationInfo *
378      DFTSInfo = D->getDependentSpecializationInfo();
379
380    // Templates.
381    Record.push_back(DFTSInfo->getNumTemplates());
382    for (int i=0, e = DFTSInfo->getNumTemplates(); i != e; ++i)
383      Writer.AddDeclRef(DFTSInfo->getTemplate(i), Record);
384
385    // Templates args.
386    Record.push_back(DFTSInfo->getNumTemplateArgs());
387    for (int i=0, e = DFTSInfo->getNumTemplateArgs(); i != e; ++i)
388      Writer.AddTemplateArgumentLoc(DFTSInfo->getTemplateArg(i), Record);
389    Writer.AddSourceLocation(DFTSInfo->getLAngleLoc(), Record);
390    Writer.AddSourceLocation(DFTSInfo->getRAngleLoc(), Record);
391    break;
392  }
393  }
394
395  // FunctionDecl's body is handled last at ASTWriterDecl::Visit,
396  // after everything else is written.
397
398  Record.push_back(D->getStorageClass()); // FIXME: stable encoding
399  Record.push_back(D->getStorageClassAsWritten());
400  Record.push_back(D->IsInline);
401  Record.push_back(D->isInlineSpecified());
402  Record.push_back(D->isVirtualAsWritten());
403  Record.push_back(D->isPure());
404  Record.push_back(D->hasInheritedPrototype());
405  Record.push_back(D->hasWrittenPrototype());
406  Record.push_back(D->isDeletedAsWritten());
407  Record.push_back(D->isTrivial());
408  Record.push_back(D->isDefaulted());
409  Record.push_back(D->isExplicitlyDefaulted());
410  Record.push_back(D->hasImplicitReturnZero());
411  Record.push_back(D->isConstexpr());
412  Writer.AddSourceLocation(D->getLocEnd(), Record);
413
414  Record.push_back(D->param_size());
415  for (FunctionDecl::param_iterator P = D->param_begin(), PEnd = D->param_end();
416       P != PEnd; ++P)
417    Writer.AddDeclRef(*P, Record);
418  Code = serialization::DECL_FUNCTION;
419}
420
421void ASTDeclWriter::VisitObjCMethodDecl(ObjCMethodDecl *D) {
422  VisitNamedDecl(D);
423  // FIXME: convert to LazyStmtPtr?
424  // Unlike C/C++, method bodies will never be in header files.
425  bool HasBodyStuff = D->getBody() != 0     ||
426                      D->getSelfDecl() != 0 || D->getCmdDecl() != 0;
427  Record.push_back(HasBodyStuff);
428  if (HasBodyStuff) {
429    Writer.AddStmt(D->getBody());
430    Writer.AddDeclRef(D->getSelfDecl(), Record);
431    Writer.AddDeclRef(D->getCmdDecl(), Record);
432  }
433  Record.push_back(D->isInstanceMethod());
434  Record.push_back(D->isVariadic());
435  Record.push_back(D->isSynthesized());
436  Record.push_back(D->isDefined());
437
438  Record.push_back(D->IsRedeclaration);
439  Record.push_back(D->HasRedeclaration);
440  if (D->HasRedeclaration) {
441    assert(Context.getObjCMethodRedeclaration(D));
442    Writer.AddDeclRef(Context.getObjCMethodRedeclaration(D), Record);
443  }
444
445  // FIXME: stable encoding for @required/@optional
446  Record.push_back(D->getImplementationControl());
447  // FIXME: stable encoding for in/out/inout/bycopy/byref/oneway
448  Record.push_back(D->getObjCDeclQualifier());
449  Record.push_back(D->hasRelatedResultType());
450  Writer.AddTypeRef(D->getResultType(), Record);
451  Writer.AddTypeSourceInfo(D->getResultTypeSourceInfo(), Record);
452  Writer.AddSourceLocation(D->getLocEnd(), Record);
453  Record.push_back(D->param_size());
454  for (ObjCMethodDecl::param_iterator P = D->param_begin(),
455                                   PEnd = D->param_end(); P != PEnd; ++P)
456    Writer.AddDeclRef(*P, Record);
457
458  Record.push_back(D->SelLocsKind);
459  unsigned NumStoredSelLocs = D->getNumStoredSelLocs();
460  SourceLocation *SelLocs = D->getStoredSelLocs();
461  Record.push_back(NumStoredSelLocs);
462  for (unsigned i = 0; i != NumStoredSelLocs; ++i)
463    Writer.AddSourceLocation(SelLocs[i], Record);
464
465  Code = serialization::DECL_OBJC_METHOD;
466}
467
468void ASTDeclWriter::VisitObjCContainerDecl(ObjCContainerDecl *D) {
469  VisitNamedDecl(D);
470  Writer.AddSourceLocation(D->getAtStartLoc(), Record);
471  Writer.AddSourceRange(D->getAtEndRange(), Record);
472  // Abstract class (no need to define a stable serialization::DECL code).
473}
474
475void ASTDeclWriter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *D) {
476  VisitRedeclarable(D);
477  VisitObjCContainerDecl(D);
478  Writer.AddTypeRef(QualType(D->getTypeForDecl(), 0), Record);
479
480  ObjCInterfaceDecl *Def = D->getDefinition();
481  Writer.AddDeclRef(Def, Record);
482
483  if (D == Def) {
484    // Write the DefinitionData
485    ObjCInterfaceDecl::DefinitionData &Data = D->data();
486
487    Writer.AddDeclRef(D->getSuperClass(), Record);
488    Writer.AddSourceLocation(D->getSuperClassLoc(), Record);
489    Writer.AddSourceLocation(D->getEndOfDefinitionLoc(), Record);
490
491    // Write out the protocols that are directly referenced by the @interface.
492    Record.push_back(Data.ReferencedProtocols.size());
493    for (ObjCInterfaceDecl::protocol_iterator P = D->protocol_begin(),
494                                           PEnd = D->protocol_end();
495         P != PEnd; ++P)
496      Writer.AddDeclRef(*P, Record);
497    for (ObjCInterfaceDecl::protocol_loc_iterator PL = D->protocol_loc_begin(),
498         PLEnd = D->protocol_loc_end();
499         PL != PLEnd; ++PL)
500      Writer.AddSourceLocation(*PL, Record);
501
502    // Write out the protocols that are transitively referenced.
503    Record.push_back(Data.AllReferencedProtocols.size());
504    for (ObjCList<ObjCProtocolDecl>::iterator
505              P = Data.AllReferencedProtocols.begin(),
506           PEnd = Data.AllReferencedProtocols.end();
507         P != PEnd; ++P)
508      Writer.AddDeclRef(*P, Record);
509
510    // Write out the ivars.
511    Record.push_back(D->ivar_size());
512    for (ObjCInterfaceDecl::ivar_iterator I = D->ivar_begin(),
513                                       IEnd = D->ivar_end(); I != IEnd; ++I)
514      Writer.AddDeclRef(*I, Record);
515
516    Writer.AddDeclRef(D->getCategoryList(), Record);
517  }
518
519  Code = serialization::DECL_OBJC_INTERFACE;
520}
521
522void ASTDeclWriter::VisitObjCIvarDecl(ObjCIvarDecl *D) {
523  VisitFieldDecl(D);
524  // FIXME: stable encoding for @public/@private/@protected/@package
525  Record.push_back(D->getAccessControl());
526  Record.push_back(D->getSynthesize());
527
528  if (!D->hasAttrs() &&
529      !D->isImplicit() &&
530      !D->isUsed(false) &&
531      !D->isInvalidDecl() &&
532      !D->isReferenced() &&
533      !D->isModulePrivate() &&
534      !D->getBitWidth() &&
535      !D->hasExtInfo() &&
536      D->getDeclName())
537    AbbrevToUse = Writer.getDeclObjCIvarAbbrev();
538
539  Code = serialization::DECL_OBJC_IVAR;
540}
541
542void ASTDeclWriter::VisitObjCProtocolDecl(ObjCProtocolDecl *D) {
543  VisitObjCContainerDecl(D);
544  Record.push_back(D->isInitiallyForwardDecl());
545  Record.push_back(D->isForwardDecl());
546  Writer.AddSourceLocation(D->getLocEnd(), Record);
547  Record.push_back(D->protocol_size());
548  for (ObjCProtocolDecl::protocol_iterator
549       I = D->protocol_begin(), IEnd = D->protocol_end(); I != IEnd; ++I)
550    Writer.AddDeclRef(*I, Record);
551  for (ObjCProtocolDecl::protocol_loc_iterator PL = D->protocol_loc_begin(),
552         PLEnd = D->protocol_loc_end();
553       PL != PLEnd; ++PL)
554    Writer.AddSourceLocation(*PL, Record);
555  Code = serialization::DECL_OBJC_PROTOCOL;
556}
557
558void ASTDeclWriter::VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D) {
559  VisitFieldDecl(D);
560  Code = serialization::DECL_OBJC_AT_DEFS_FIELD;
561}
562
563void ASTDeclWriter::VisitObjCClassDecl(ObjCClassDecl *D) {
564  VisitDecl(D);
565  Writer.AddDeclRef(D->Interface, Record);
566  Writer.AddSourceLocation(D->InterfaceLoc, Record);
567  Code = serialization::DECL_OBJC_CLASS;
568}
569
570void ASTDeclWriter::VisitObjCForwardProtocolDecl(ObjCForwardProtocolDecl *D) {
571  VisitDecl(D);
572  Record.push_back(D->protocol_size());
573  for (ObjCForwardProtocolDecl::protocol_iterator
574       I = D->protocol_begin(), IEnd = D->protocol_end(); I != IEnd; ++I)
575    Writer.AddDeclRef(*I, Record);
576  for (ObjCForwardProtocolDecl::protocol_loc_iterator
577         PL = D->protocol_loc_begin(), PLEnd = D->protocol_loc_end();
578       PL != PLEnd; ++PL)
579    Writer.AddSourceLocation(*PL, Record);
580  Code = serialization::DECL_OBJC_FORWARD_PROTOCOL;
581}
582
583void ASTDeclWriter::VisitObjCCategoryDecl(ObjCCategoryDecl *D) {
584  VisitObjCContainerDecl(D);
585  Writer.AddDeclRef(D->getClassInterface(), Record);
586  Record.push_back(D->protocol_size());
587  for (ObjCCategoryDecl::protocol_iterator
588       I = D->protocol_begin(), IEnd = D->protocol_end(); I != IEnd; ++I)
589    Writer.AddDeclRef(*I, Record);
590  for (ObjCCategoryDecl::protocol_loc_iterator
591         PL = D->protocol_loc_begin(), PLEnd = D->protocol_loc_end();
592       PL != PLEnd; ++PL)
593    Writer.AddSourceLocation(*PL, Record);
594  Writer.AddDeclRef(D->getNextClassCategory(), Record);
595  Record.push_back(D->hasSynthBitfield());
596  Writer.AddSourceLocation(D->getCategoryNameLoc(), Record);
597  Code = serialization::DECL_OBJC_CATEGORY;
598}
599
600void ASTDeclWriter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D) {
601  VisitNamedDecl(D);
602  Writer.AddDeclRef(D->getClassInterface(), Record);
603  Code = serialization::DECL_OBJC_COMPATIBLE_ALIAS;
604}
605
606void ASTDeclWriter::VisitObjCPropertyDecl(ObjCPropertyDecl *D) {
607  VisitNamedDecl(D);
608  Writer.AddSourceLocation(D->getAtLoc(), Record);
609  Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record);
610  // FIXME: stable encoding
611  Record.push_back((unsigned)D->getPropertyAttributes());
612  Record.push_back((unsigned)D->getPropertyAttributesAsWritten());
613  // FIXME: stable encoding
614  Record.push_back((unsigned)D->getPropertyImplementation());
615  Writer.AddDeclarationName(D->getGetterName(), Record);
616  Writer.AddDeclarationName(D->getSetterName(), Record);
617  Writer.AddDeclRef(D->getGetterMethodDecl(), Record);
618  Writer.AddDeclRef(D->getSetterMethodDecl(), Record);
619  Writer.AddDeclRef(D->getPropertyIvarDecl(), Record);
620  Code = serialization::DECL_OBJC_PROPERTY;
621}
622
623void ASTDeclWriter::VisitObjCImplDecl(ObjCImplDecl *D) {
624  VisitObjCContainerDecl(D);
625  Writer.AddDeclRef(D->getClassInterface(), Record);
626  // Abstract class (no need to define a stable serialization::DECL code).
627}
628
629void ASTDeclWriter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D) {
630  VisitObjCImplDecl(D);
631  Writer.AddIdentifierRef(D->getIdentifier(), Record);
632  Writer.AddSourceLocation(D->getCategoryNameLoc(), Record);
633  Code = serialization::DECL_OBJC_CATEGORY_IMPL;
634}
635
636void ASTDeclWriter::VisitObjCImplementationDecl(ObjCImplementationDecl *D) {
637  VisitObjCImplDecl(D);
638  Writer.AddDeclRef(D->getSuperClass(), Record);
639  Writer.AddCXXCtorInitializers(D->IvarInitializers, D->NumIvarInitializers,
640                                Record);
641  Record.push_back(D->hasSynthBitfield());
642  Code = serialization::DECL_OBJC_IMPLEMENTATION;
643}
644
645void ASTDeclWriter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D) {
646  VisitDecl(D);
647  Writer.AddSourceLocation(D->getLocStart(), Record);
648  Writer.AddDeclRef(D->getPropertyDecl(), Record);
649  Writer.AddDeclRef(D->getPropertyIvarDecl(), Record);
650  Writer.AddSourceLocation(D->getPropertyIvarDeclLoc(), Record);
651  Writer.AddStmt(D->getGetterCXXConstructor());
652  Writer.AddStmt(D->getSetterCXXAssignment());
653  Code = serialization::DECL_OBJC_PROPERTY_IMPL;
654}
655
656void ASTDeclWriter::VisitFieldDecl(FieldDecl *D) {
657  VisitDeclaratorDecl(D);
658  Record.push_back(D->isMutable());
659  Record.push_back(D->getBitWidth()? 1 : D->hasInClassInitializer() ? 2 : 0);
660  if (D->getBitWidth())
661    Writer.AddStmt(D->getBitWidth());
662  else if (D->hasInClassInitializer())
663    Writer.AddStmt(D->getInClassInitializer());
664  if (!D->getDeclName())
665    Writer.AddDeclRef(Context.getInstantiatedFromUnnamedFieldDecl(D), Record);
666
667  if (!D->hasAttrs() &&
668      !D->isImplicit() &&
669      !D->isUsed(false) &&
670      !D->isInvalidDecl() &&
671      !D->isReferenced() &&
672      !D->isTopLevelDeclInObjCContainer() &&
673      !D->isModulePrivate() &&
674      !D->getBitWidth() &&
675      !D->hasInClassInitializer() &&
676      !D->hasExtInfo() &&
677      !ObjCIvarDecl::classofKind(D->getKind()) &&
678      !ObjCAtDefsFieldDecl::classofKind(D->getKind()) &&
679      D->getDeclName())
680    AbbrevToUse = Writer.getDeclFieldAbbrev();
681
682  Code = serialization::DECL_FIELD;
683}
684
685void ASTDeclWriter::VisitIndirectFieldDecl(IndirectFieldDecl *D) {
686  VisitValueDecl(D);
687  Record.push_back(D->getChainingSize());
688
689  for (IndirectFieldDecl::chain_iterator
690       P = D->chain_begin(),
691       PEnd = D->chain_end(); P != PEnd; ++P)
692    Writer.AddDeclRef(*P, Record);
693  Code = serialization::DECL_INDIRECTFIELD;
694}
695
696void ASTDeclWriter::VisitVarDecl(VarDecl *D) {
697  VisitRedeclarable(D);
698  VisitDeclaratorDecl(D);
699  Record.push_back(D->getStorageClass()); // FIXME: stable encoding
700  Record.push_back(D->getStorageClassAsWritten());
701  Record.push_back(D->isThreadSpecified());
702  Record.push_back(D->hasCXXDirectInitializer());
703  Record.push_back(D->isExceptionVariable());
704  Record.push_back(D->isNRVOVariable());
705  Record.push_back(D->isCXXForRangeDecl());
706  Record.push_back(D->isARCPseudoStrong());
707  if (D->getInit()) {
708    Record.push_back(!D->isInitKnownICE() ? 1 : (D->isInitICE() ? 3 : 2));
709    Writer.AddStmt(D->getInit());
710  } else {
711    Record.push_back(0);
712  }
713
714  MemberSpecializationInfo *SpecInfo
715    = D->isStaticDataMember() ? D->getMemberSpecializationInfo() : 0;
716  Record.push_back(SpecInfo != 0);
717  if (SpecInfo) {
718    Writer.AddDeclRef(SpecInfo->getInstantiatedFrom(), Record);
719    Record.push_back(SpecInfo->getTemplateSpecializationKind());
720    Writer.AddSourceLocation(SpecInfo->getPointOfInstantiation(), Record);
721  }
722
723  if (!D->hasAttrs() &&
724      !D->isImplicit() &&
725      !D->isUsed(false) &&
726      !D->isInvalidDecl() &&
727      !D->isReferenced() &&
728      !D->isTopLevelDeclInObjCContainer() &&
729      D->getAccess() == AS_none &&
730      !D->isModulePrivate() &&
731      D->getDeclName().getNameKind() == DeclarationName::Identifier &&
732      !D->hasExtInfo() &&
733      isFirstDeclInFile(D) &&
734      !D->hasCXXDirectInitializer() &&
735      D->getInit() == 0 &&
736      !isa<ParmVarDecl>(D) &&
737      !SpecInfo)
738    AbbrevToUse = Writer.getDeclVarAbbrev();
739
740  Code = serialization::DECL_VAR;
741}
742
743void ASTDeclWriter::VisitImplicitParamDecl(ImplicitParamDecl *D) {
744  VisitVarDecl(D);
745  Code = serialization::DECL_IMPLICIT_PARAM;
746}
747
748void ASTDeclWriter::VisitParmVarDecl(ParmVarDecl *D) {
749  VisitVarDecl(D);
750  Record.push_back(D->isObjCMethodParameter());
751  Record.push_back(D->getFunctionScopeDepth());
752  Record.push_back(D->getFunctionScopeIndex());
753  Record.push_back(D->getObjCDeclQualifier()); // FIXME: stable encoding
754  Record.push_back(D->isKNRPromoted());
755  Record.push_back(D->hasInheritedDefaultArg());
756  Record.push_back(D->hasUninstantiatedDefaultArg());
757  if (D->hasUninstantiatedDefaultArg())
758    Writer.AddStmt(D->getUninstantiatedDefaultArg());
759  Code = serialization::DECL_PARM_VAR;
760
761  assert(!D->isARCPseudoStrong()); // can be true of ImplicitParamDecl
762
763  // If the assumptions about the DECL_PARM_VAR abbrev are true, use it.  Here
764  // we dynamically check for the properties that we optimize for, but don't
765  // know are true of all PARM_VAR_DECLs.
766  if (!D->hasAttrs() &&
767      !D->hasExtInfo() &&
768      !D->isImplicit() &&
769      !D->isUsed(false) &&
770      D->getAccess() == AS_none &&
771      !D->isModulePrivate() &&
772      D->getStorageClass() == 0 &&
773      !D->hasCXXDirectInitializer() && // Can params have this ever?
774      D->getFunctionScopeDepth() == 0 &&
775      D->getObjCDeclQualifier() == 0 &&
776      !D->isKNRPromoted() &&
777      !D->hasInheritedDefaultArg() &&
778      D->getInit() == 0 &&
779      !D->hasUninstantiatedDefaultArg())  // No default expr.
780    AbbrevToUse = Writer.getDeclParmVarAbbrev();
781
782  // Check things we know are true of *every* PARM_VAR_DECL, which is more than
783  // just us assuming it.
784  assert(!D->isInvalidDecl() && "Shouldn't emit invalid decls");
785  assert(!D->isThreadSpecified() && "PARM_VAR_DECL can't be __thread");
786  assert(D->getAccess() == AS_none && "PARM_VAR_DECL can't be public/private");
787  assert(!D->isExceptionVariable() && "PARM_VAR_DECL can't be exception var");
788  assert(D->getPreviousDeclaration() == 0 && "PARM_VAR_DECL can't be redecl");
789  assert(!D->isStaticDataMember() &&
790         "PARM_VAR_DECL can't be static data member");
791}
792
793void ASTDeclWriter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
794  VisitDecl(D);
795  Writer.AddStmt(D->getAsmString());
796  Writer.AddSourceLocation(D->getRParenLoc(), Record);
797  Code = serialization::DECL_FILE_SCOPE_ASM;
798}
799
800void ASTDeclWriter::VisitBlockDecl(BlockDecl *D) {
801  VisitDecl(D);
802  Writer.AddStmt(D->getBody());
803  Writer.AddTypeSourceInfo(D->getSignatureAsWritten(), Record);
804  Record.push_back(D->param_size());
805  for (FunctionDecl::param_iterator P = D->param_begin(), PEnd = D->param_end();
806       P != PEnd; ++P)
807    Writer.AddDeclRef(*P, Record);
808  Record.push_back(D->capturesCXXThis());
809  Record.push_back(D->getNumCaptures());
810  for (BlockDecl::capture_iterator
811         i = D->capture_begin(), e = D->capture_end(); i != e; ++i) {
812    const BlockDecl::Capture &capture = *i;
813    Writer.AddDeclRef(capture.getVariable(), Record);
814
815    unsigned flags = 0;
816    if (capture.isByRef()) flags |= 1;
817    if (capture.isNested()) flags |= 2;
818    if (capture.hasCopyExpr()) flags |= 4;
819    Record.push_back(flags);
820
821    if (capture.hasCopyExpr()) Writer.AddStmt(capture.getCopyExpr());
822  }
823
824  Code = serialization::DECL_BLOCK;
825}
826
827void ASTDeclWriter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
828  VisitDecl(D);
829  Record.push_back(D->getLanguage());
830  Writer.AddSourceLocation(D->getExternLoc(), Record);
831  Writer.AddSourceLocation(D->getRBraceLoc(), Record);
832  Code = serialization::DECL_LINKAGE_SPEC;
833}
834
835void ASTDeclWriter::VisitLabelDecl(LabelDecl *D) {
836  VisitNamedDecl(D);
837  Writer.AddSourceLocation(D->getLocStart(), Record);
838  Code = serialization::DECL_LABEL;
839}
840
841
842void ASTDeclWriter::VisitNamespaceDecl(NamespaceDecl *D) {
843  VisitNamedDecl(D);
844  Record.push_back(D->isInline());
845  Writer.AddSourceLocation(D->getLocStart(), Record);
846  Writer.AddSourceLocation(D->getRBraceLoc(), Record);
847  Writer.AddDeclRef(D->getNextNamespace(), Record);
848
849  // Only write one reference--original or anonymous
850  Record.push_back(D->isOriginalNamespace());
851  if (D->isOriginalNamespace())
852    Writer.AddDeclRef(D->getAnonymousNamespace(), Record);
853  else
854    Writer.AddDeclRef(D->getOriginalNamespace(), Record);
855  Code = serialization::DECL_NAMESPACE;
856
857  if (Writer.hasChain() && !D->isOriginalNamespace() &&
858      D->getOriginalNamespace()->isFromASTFile()) {
859    NamespaceDecl *NS = D->getOriginalNamespace();
860    Writer.AddUpdatedDeclContext(NS);
861
862    // Make sure all visible decls are written. They will be recorded later.
863    NS->lookup(DeclarationName());
864    StoredDeclsMap *Map = static_cast<StoredDeclsMap*>(NS->getLookupPtr());
865    if (Map) {
866      for (StoredDeclsMap::iterator D = Map->begin(), DEnd = Map->end();
867           D != DEnd; ++D) {
868        DeclContext::lookup_result Result = D->second.getLookupResult();
869        while (Result.first != Result.second) {
870          Writer.GetDeclRef(*Result.first);
871          ++Result.first;
872        }
873      }
874    }
875  }
876
877  if (Writer.hasChain() && D->isAnonymousNamespace() && !D->getNextNamespace()){
878    // This is a most recent reopening of the anonymous namespace. If its parent
879    // is in a previous PCH (or is the TU), mark that parent for update, because
880    // the original namespace always points to the latest re-opening of its
881    // anonymous namespace.
882    Decl *Parent = cast<Decl>(
883        D->getParent()->getRedeclContext()->getPrimaryContext());
884    if (Parent->isFromASTFile() || isa<TranslationUnitDecl>(Parent)) {
885      ASTWriter::UpdateRecord &Record = Writer.DeclUpdates[Parent];
886      Record.push_back(UPD_CXX_ADDED_ANONYMOUS_NAMESPACE);
887      Writer.AddDeclRef(D, Record);
888    }
889  }
890}
891
892void ASTDeclWriter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
893  VisitNamedDecl(D);
894  Writer.AddSourceLocation(D->getNamespaceLoc(), Record);
895  Writer.AddSourceLocation(D->getTargetNameLoc(), Record);
896  Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
897  Writer.AddDeclRef(D->getNamespace(), Record);
898  Code = serialization::DECL_NAMESPACE_ALIAS;
899}
900
901void ASTDeclWriter::VisitUsingDecl(UsingDecl *D) {
902  VisitNamedDecl(D);
903  Writer.AddSourceLocation(D->getUsingLocation(), Record);
904  Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
905  Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
906  Writer.AddDeclRef(D->FirstUsingShadow, Record);
907  Record.push_back(D->isTypeName());
908  Writer.AddDeclRef(Context.getInstantiatedFromUsingDecl(D), Record);
909  Code = serialization::DECL_USING;
910}
911
912void ASTDeclWriter::VisitUsingShadowDecl(UsingShadowDecl *D) {
913  VisitNamedDecl(D);
914  Writer.AddDeclRef(D->getTargetDecl(), Record);
915  Writer.AddDeclRef(D->UsingOrNextShadow, Record);
916  Writer.AddDeclRef(Context.getInstantiatedFromUsingShadowDecl(D), Record);
917  Code = serialization::DECL_USING_SHADOW;
918}
919
920void ASTDeclWriter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
921  VisitNamedDecl(D);
922  Writer.AddSourceLocation(D->getUsingLoc(), Record);
923  Writer.AddSourceLocation(D->getNamespaceKeyLocation(), Record);
924  Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
925  Writer.AddDeclRef(D->getNominatedNamespace(), Record);
926  Writer.AddDeclRef(dyn_cast<Decl>(D->getCommonAncestor()), Record);
927  Code = serialization::DECL_USING_DIRECTIVE;
928}
929
930void ASTDeclWriter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
931  VisitValueDecl(D);
932  Writer.AddSourceLocation(D->getUsingLoc(), Record);
933  Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
934  Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
935  Code = serialization::DECL_UNRESOLVED_USING_VALUE;
936}
937
938void ASTDeclWriter::VisitUnresolvedUsingTypenameDecl(
939                                               UnresolvedUsingTypenameDecl *D) {
940  VisitTypeDecl(D);
941  Writer.AddSourceLocation(D->getTypenameLoc(), Record);
942  Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
943  Code = serialization::DECL_UNRESOLVED_USING_TYPENAME;
944}
945
946void ASTDeclWriter::VisitCXXRecordDecl(CXXRecordDecl *D) {
947  VisitRecordDecl(D);
948
949  CXXRecordDecl *DefinitionDecl = 0;
950  if (D->DefinitionData)
951    DefinitionDecl = D->DefinitionData->Definition;
952  Writer.AddDeclRef(DefinitionDecl, Record);
953  if (D == DefinitionDecl)
954    Writer.AddCXXDefinitionData(D, Record);
955
956  enum {
957    CXXRecNotTemplate = 0, CXXRecTemplate, CXXRecMemberSpecialization
958  };
959  if (ClassTemplateDecl *TemplD = D->getDescribedClassTemplate()) {
960    Record.push_back(CXXRecTemplate);
961    Writer.AddDeclRef(TemplD, Record);
962  } else if (MemberSpecializationInfo *MSInfo
963               = D->getMemberSpecializationInfo()) {
964    Record.push_back(CXXRecMemberSpecialization);
965    Writer.AddDeclRef(MSInfo->getInstantiatedFrom(), Record);
966    Record.push_back(MSInfo->getTemplateSpecializationKind());
967    Writer.AddSourceLocation(MSInfo->getPointOfInstantiation(), Record);
968  } else {
969    Record.push_back(CXXRecNotTemplate);
970  }
971
972  // Store the key function to avoid deserializing every method so we can
973  // compute it.
974  if (D->IsCompleteDefinition)
975    Writer.AddDeclRef(Context.getKeyFunction(D), Record);
976
977  Code = serialization::DECL_CXX_RECORD;
978}
979
980void ASTDeclWriter::VisitCXXMethodDecl(CXXMethodDecl *D) {
981  VisitFunctionDecl(D);
982  Record.push_back(D->size_overridden_methods());
983  for (CXXMethodDecl::method_iterator
984         I = D->begin_overridden_methods(), E = D->end_overridden_methods();
985         I != E; ++I)
986    Writer.AddDeclRef(*I, Record);
987  Code = serialization::DECL_CXX_METHOD;
988}
989
990void ASTDeclWriter::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
991  VisitCXXMethodDecl(D);
992
993  Record.push_back(D->IsExplicitSpecified);
994  Record.push_back(D->ImplicitlyDefined);
995  Writer.AddCXXCtorInitializers(D->CtorInitializers, D->NumCtorInitializers,
996                                Record);
997
998  Code = serialization::DECL_CXX_CONSTRUCTOR;
999}
1000
1001void ASTDeclWriter::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
1002  VisitCXXMethodDecl(D);
1003
1004  Record.push_back(D->ImplicitlyDefined);
1005  Writer.AddDeclRef(D->OperatorDelete, Record);
1006
1007  Code = serialization::DECL_CXX_DESTRUCTOR;
1008}
1009
1010void ASTDeclWriter::VisitCXXConversionDecl(CXXConversionDecl *D) {
1011  VisitCXXMethodDecl(D);
1012  Record.push_back(D->IsExplicitSpecified);
1013  Code = serialization::DECL_CXX_CONVERSION;
1014}
1015
1016void ASTDeclWriter::VisitImportDecl(ImportDecl *D) {
1017  VisitDecl(D);
1018  ArrayRef<SourceLocation> IdentifierLocs = D->getIdentifierLocs();
1019  Record.push_back(!IdentifierLocs.empty());
1020  if (IdentifierLocs.empty()) {
1021    Writer.AddSourceLocation(D->getLocEnd(), Record);
1022    Record.push_back(1);
1023  } else {
1024    for (unsigned I = 0, N = IdentifierLocs.size(); I != N; ++I)
1025      Writer.AddSourceLocation(IdentifierLocs[I], Record);
1026    Record.push_back(IdentifierLocs.size());
1027  }
1028  // Note: the number of source locations must always be the last element in
1029  // the record.
1030  Code = serialization::DECL_IMPORT;
1031}
1032
1033void ASTDeclWriter::VisitAccessSpecDecl(AccessSpecDecl *D) {
1034  VisitDecl(D);
1035  Writer.AddSourceLocation(D->getColonLoc(), Record);
1036  Code = serialization::DECL_ACCESS_SPEC;
1037}
1038
1039void ASTDeclWriter::VisitFriendDecl(FriendDecl *D) {
1040  VisitDecl(D);
1041  Record.push_back(D->Friend.is<TypeSourceInfo*>());
1042  if (D->Friend.is<TypeSourceInfo*>())
1043    Writer.AddTypeSourceInfo(D->Friend.get<TypeSourceInfo*>(), Record);
1044  else
1045    Writer.AddDeclRef(D->Friend.get<NamedDecl*>(), Record);
1046  Writer.AddDeclRef(D->getNextFriend(), Record);
1047  Record.push_back(D->UnsupportedFriend);
1048  Writer.AddSourceLocation(D->FriendLoc, Record);
1049  Code = serialization::DECL_FRIEND;
1050}
1051
1052void ASTDeclWriter::VisitFriendTemplateDecl(FriendTemplateDecl *D) {
1053  VisitDecl(D);
1054  Record.push_back(D->getNumTemplateParameters());
1055  for (unsigned i = 0, e = D->getNumTemplateParameters(); i != e; ++i)
1056    Writer.AddTemplateParameterList(D->getTemplateParameterList(i), Record);
1057  Record.push_back(D->getFriendDecl() != 0);
1058  if (D->getFriendDecl())
1059    Writer.AddDeclRef(D->getFriendDecl(), Record);
1060  else
1061    Writer.AddTypeSourceInfo(D->getFriendType(), Record);
1062  Writer.AddSourceLocation(D->getFriendLoc(), Record);
1063  Code = serialization::DECL_FRIEND_TEMPLATE;
1064}
1065
1066void ASTDeclWriter::VisitTemplateDecl(TemplateDecl *D) {
1067  VisitNamedDecl(D);
1068
1069  Writer.AddDeclRef(D->getTemplatedDecl(), Record);
1070  Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1071}
1072
1073void ASTDeclWriter::VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D) {
1074  // Emit data to initialize CommonOrPrev before VisitTemplateDecl so that
1075  // getCommonPtr() can be used while this is still initializing.
1076
1077  Writer.AddDeclRef(D->getPreviousDeclaration(), Record);
1078  if (D->getPreviousDeclaration())
1079    Writer.AddDeclRef(D->getFirstDeclaration(), Record);
1080
1081  if (D->getPreviousDeclaration() == 0) {
1082    // This TemplateDecl owns the CommonPtr; write it.
1083    assert(D->isCanonicalDecl());
1084
1085    Writer.AddDeclRef(D->getInstantiatedFromMemberTemplate(), Record);
1086    if (D->getInstantiatedFromMemberTemplate())
1087      Record.push_back(D->isMemberSpecialization());
1088
1089    Writer.AddDeclRef(D->getCommonPtr()->Latest, Record);
1090  } else {
1091    RedeclarableTemplateDecl *First = D->getFirstDeclaration();
1092    assert(First != D);
1093    // If this is a most recent redeclaration that is pointed to by a first decl
1094    // in a chained PCH, keep track of the association with the map so we can
1095    // update the first decl during AST reading.
1096    if (First->getMostRecentDeclaration() == D &&
1097        First->isFromASTFile() && !D->isFromASTFile()) {
1098      assert(Writer.FirstLatestDecls.find(First)==Writer.FirstLatestDecls.end()
1099             && "The latest is already set");
1100      Writer.FirstLatestDecls[First] = D;
1101    }
1102  }
1103
1104  VisitTemplateDecl(D);
1105  Record.push_back(D->getIdentifierNamespace());
1106}
1107
1108void ASTDeclWriter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1109  VisitRedeclarableTemplateDecl(D);
1110
1111  if (D->getPreviousDeclaration() == 0) {
1112    typedef llvm::FoldingSet<ClassTemplateSpecializationDecl> CTSDSetTy;
1113    CTSDSetTy &CTSDSet = D->getSpecializations();
1114    Record.push_back(CTSDSet.size());
1115    for (CTSDSetTy::iterator I=CTSDSet.begin(), E = CTSDSet.end(); I!=E; ++I) {
1116      assert(I->isCanonicalDecl() && "Expected only canonical decls in set");
1117      Writer.AddDeclRef(&*I, Record);
1118    }
1119
1120    typedef llvm::FoldingSet<ClassTemplatePartialSpecializationDecl> CTPSDSetTy;
1121    CTPSDSetTy &CTPSDSet = D->getPartialSpecializations();
1122    Record.push_back(CTPSDSet.size());
1123    for (CTPSDSetTy::iterator I=CTPSDSet.begin(), E=CTPSDSet.end(); I!=E; ++I) {
1124      assert(I->isCanonicalDecl() && "Expected only canonical decls in set");
1125      Writer.AddDeclRef(&*I, Record);
1126    }
1127
1128    // InjectedClassNameType is computed, no need to write it.
1129  }
1130  Code = serialization::DECL_CLASS_TEMPLATE;
1131}
1132
1133void ASTDeclWriter::VisitClassTemplateSpecializationDecl(
1134                                           ClassTemplateSpecializationDecl *D) {
1135  VisitCXXRecordDecl(D);
1136
1137  llvm::PointerUnion<ClassTemplateDecl *,
1138                     ClassTemplatePartialSpecializationDecl *> InstFrom
1139    = D->getSpecializedTemplateOrPartial();
1140  if (Decl *InstFromD = InstFrom.dyn_cast<ClassTemplateDecl *>()) {
1141    Writer.AddDeclRef(InstFromD, Record);
1142  } else {
1143    Writer.AddDeclRef(InstFrom.get<ClassTemplatePartialSpecializationDecl *>(),
1144                      Record);
1145    Writer.AddTemplateArgumentList(&D->getTemplateInstantiationArgs(), Record);
1146  }
1147
1148  // Explicit info.
1149  Writer.AddTypeSourceInfo(D->getTypeAsWritten(), Record);
1150  if (D->getTypeAsWritten()) {
1151    Writer.AddSourceLocation(D->getExternLoc(), Record);
1152    Writer.AddSourceLocation(D->getTemplateKeywordLoc(), Record);
1153  }
1154
1155  Writer.AddTemplateArgumentList(&D->getTemplateArgs(), Record);
1156  Writer.AddSourceLocation(D->getPointOfInstantiation(), Record);
1157  Record.push_back(D->getSpecializationKind());
1158
1159  if (D->isCanonicalDecl()) {
1160    // When reading, we'll add it to the folding set of the following template.
1161    Writer.AddDeclRef(D->getSpecializedTemplate()->getCanonicalDecl(), Record);
1162  }
1163
1164  Code = serialization::DECL_CLASS_TEMPLATE_SPECIALIZATION;
1165}
1166
1167void ASTDeclWriter::VisitClassTemplatePartialSpecializationDecl(
1168                                    ClassTemplatePartialSpecializationDecl *D) {
1169  VisitClassTemplateSpecializationDecl(D);
1170
1171  Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1172
1173  Record.push_back(D->getNumTemplateArgsAsWritten());
1174  for (int i = 0, e = D->getNumTemplateArgsAsWritten(); i != e; ++i)
1175    Writer.AddTemplateArgumentLoc(D->getTemplateArgsAsWritten()[i], Record);
1176
1177  Record.push_back(D->getSequenceNumber());
1178
1179  // These are read/set from/to the first declaration.
1180  if (D->getPreviousDeclaration() == 0) {
1181    Writer.AddDeclRef(D->getInstantiatedFromMember(), Record);
1182    Record.push_back(D->isMemberSpecialization());
1183  }
1184
1185  Code = serialization::DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION;
1186}
1187
1188void ASTDeclWriter::VisitClassScopeFunctionSpecializationDecl(
1189                                    ClassScopeFunctionSpecializationDecl *D) {
1190  VisitDecl(D);
1191  Writer.AddDeclRef(D->getSpecialization(), Record);
1192  Code = serialization::DECL_CLASS_SCOPE_FUNCTION_SPECIALIZATION;
1193}
1194
1195
1196void ASTDeclWriter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1197  VisitRedeclarableTemplateDecl(D);
1198
1199  if (D->getPreviousDeclaration() == 0) {
1200    // This FunctionTemplateDecl owns the CommonPtr; write it.
1201
1202    // Write the function specialization declarations.
1203    Record.push_back(D->getSpecializations().size());
1204    for (llvm::FoldingSet<FunctionTemplateSpecializationInfo>::iterator
1205           I = D->getSpecializations().begin(),
1206           E = D->getSpecializations().end()   ; I != E; ++I) {
1207      assert(I->Function->isCanonicalDecl() &&
1208             "Expected only canonical decls in set");
1209      Writer.AddDeclRef(I->Function, Record);
1210    }
1211  }
1212  Code = serialization::DECL_FUNCTION_TEMPLATE;
1213}
1214
1215void ASTDeclWriter::VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D) {
1216  VisitTypeDecl(D);
1217
1218  Record.push_back(D->wasDeclaredWithTypename());
1219  Record.push_back(D->defaultArgumentWasInherited());
1220  Writer.AddTypeSourceInfo(D->getDefaultArgumentInfo(), Record);
1221
1222  Code = serialization::DECL_TEMPLATE_TYPE_PARM;
1223}
1224
1225void ASTDeclWriter::VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {
1226  // For an expanded parameter pack, record the number of expansion types here
1227  // so that it's easier for
1228  if (D->isExpandedParameterPack())
1229    Record.push_back(D->getNumExpansionTypes());
1230
1231  VisitDeclaratorDecl(D);
1232  // TemplateParmPosition.
1233  Record.push_back(D->getDepth());
1234  Record.push_back(D->getPosition());
1235
1236  if (D->isExpandedParameterPack()) {
1237    for (unsigned I = 0, N = D->getNumExpansionTypes(); I != N; ++I) {
1238      Writer.AddTypeRef(D->getExpansionType(I), Record);
1239      Writer.AddTypeSourceInfo(D->getExpansionTypeSourceInfo(I), Record);
1240    }
1241
1242    Code = serialization::DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK;
1243  } else {
1244    // Rest of NonTypeTemplateParmDecl.
1245    Record.push_back(D->isParameterPack());
1246    Record.push_back(D->getDefaultArgument() != 0);
1247    if (D->getDefaultArgument()) {
1248      Writer.AddStmt(D->getDefaultArgument());
1249      Record.push_back(D->defaultArgumentWasInherited());
1250    }
1251    Code = serialization::DECL_NON_TYPE_TEMPLATE_PARM;
1252  }
1253}
1254
1255void ASTDeclWriter::VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D) {
1256  VisitTemplateDecl(D);
1257  // TemplateParmPosition.
1258  Record.push_back(D->getDepth());
1259  Record.push_back(D->getPosition());
1260  // Rest of TemplateTemplateParmDecl.
1261  Writer.AddTemplateArgumentLoc(D->getDefaultArgument(), Record);
1262  Record.push_back(D->defaultArgumentWasInherited());
1263  Record.push_back(D->isParameterPack());
1264  Code = serialization::DECL_TEMPLATE_TEMPLATE_PARM;
1265}
1266
1267void ASTDeclWriter::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) {
1268  VisitRedeclarableTemplateDecl(D);
1269  Code = serialization::DECL_TYPE_ALIAS_TEMPLATE;
1270}
1271
1272void ASTDeclWriter::VisitStaticAssertDecl(StaticAssertDecl *D) {
1273  VisitDecl(D);
1274  Writer.AddStmt(D->getAssertExpr());
1275  Writer.AddStmt(D->getMessage());
1276  Writer.AddSourceLocation(D->getRParenLoc(), Record);
1277  Code = serialization::DECL_STATIC_ASSERT;
1278}
1279
1280/// \brief Emit the DeclContext part of a declaration context decl.
1281///
1282/// \param LexicalOffset the offset at which the DECL_CONTEXT_LEXICAL
1283/// block for this declaration context is stored. May be 0 to indicate
1284/// that there are no declarations stored within this context.
1285///
1286/// \param VisibleOffset the offset at which the DECL_CONTEXT_VISIBLE
1287/// block for this declaration context is stored. May be 0 to indicate
1288/// that there are no declarations visible from this context. Note
1289/// that this value will not be emitted for non-primary declaration
1290/// contexts.
1291void ASTDeclWriter::VisitDeclContext(DeclContext *DC, uint64_t LexicalOffset,
1292                                     uint64_t VisibleOffset) {
1293  Record.push_back(LexicalOffset);
1294  Record.push_back(VisibleOffset);
1295}
1296
1297template <typename T>
1298void ASTDeclWriter::VisitRedeclarable(Redeclarable<T> *D) {
1299  enum { FirstInFile, PointsToPrevious };
1300  T *First = D->getFirstDeclaration();
1301  if (!D->getPreviousDeclaration() ||
1302      D->getPreviousDeclaration()->isFromASTFile()) {
1303    Record.push_back(FirstInFile);
1304    Writer.AddDeclRef(First, Record);
1305
1306    // Capture the set of redeclarations in this file.
1307    LocalRedeclarationsInfo LocalInfo = {
1308      Writer.GetDeclRef(First),
1309      Writer.GetDeclRef(static_cast<T*>(D)),
1310      Writer.GetDeclRef(D->getMostRecentDeclaration())
1311    };
1312    Writer.LocalRedeclarations.push_back(LocalInfo);
1313  } else {
1314    Record.push_back(PointsToPrevious);
1315    Writer.AddDeclRef(First, Record);
1316    Writer.AddDeclRef(D->getPreviousDeclaration(), Record);
1317  }
1318}
1319
1320//===----------------------------------------------------------------------===//
1321// ASTWriter Implementation
1322//===----------------------------------------------------------------------===//
1323
1324void ASTWriter::WriteDeclsBlockAbbrevs() {
1325  using namespace llvm;
1326
1327  BitCodeAbbrev *Abv;
1328
1329  // Abbreviation for DECL_FIELD
1330  Abv = new BitCodeAbbrev();
1331  Abv->Add(BitCodeAbbrevOp(serialization::DECL_FIELD));
1332  // Decl
1333  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1334  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1335  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl (!?)
1336  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1337  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1338  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1339  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1340  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1341  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1342  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1343  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1344  // NamedDecl
1345  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1346  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1347  // ValueDecl
1348  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1349  // DeclaratorDecl
1350  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1351  Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1352  // FieldDecl
1353  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1354  Abv->Add(BitCodeAbbrevOp(0));                       //getBitWidth
1355  // Type Source Info
1356  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1357  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1358  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1359  DeclFieldAbbrev = Stream.EmitAbbrev(Abv);
1360
1361  // Abbreviation for DECL_OBJC_IVAR
1362  Abv = new BitCodeAbbrev();
1363  Abv->Add(BitCodeAbbrevOp(serialization::DECL_OBJC_IVAR));
1364  // Decl
1365  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1366  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1367  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl (!?)
1368  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1369  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1370  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1371  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1372  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1373  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1374  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1375  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1376  // NamedDecl
1377  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1378  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1379  // ValueDecl
1380  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1381  // DeclaratorDecl
1382  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1383  Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1384  // FieldDecl
1385  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1386  Abv->Add(BitCodeAbbrevOp(0));                       //getBitWidth
1387  // ObjC Ivar
1388  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getAccessControl
1389  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getSynthesize
1390  // Type Source Info
1391  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1392  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1393  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1394  DeclObjCIvarAbbrev = Stream.EmitAbbrev(Abv);
1395
1396  // Abbreviation for DECL_ENUM
1397  Abv = new BitCodeAbbrev();
1398  Abv->Add(BitCodeAbbrevOp(serialization::DECL_ENUM));
1399  // Redeclarable
1400  Abv->Add(BitCodeAbbrevOp(0));                       // First in file
1401  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // First ID
1402  // Decl
1403  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1404  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1405  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl (!?)
1406  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1407  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1408  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1409  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1410  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1411  Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1412  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1413  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1414  // NamedDecl
1415  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1416  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1417  // TypeDecl
1418  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1419  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1420  // TagDecl
1421  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1422  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1423  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1424  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1425  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1426  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1427  Abv->Add(BitCodeAbbrevOp(0));                         // hasExtInfo
1428  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // TypedefNameAnonDecl
1429  // EnumDecl
1430  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // AddTypeRef
1431  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IntegerType
1432  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getPromotionType
1433  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumPositiveBits
1434  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumNegativeBits
1435  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScoped
1436  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScopedUsingClassTag
1437  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isFixed
1438  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // InstantiatedMembEnum
1439  // DC
1440  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1441  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1442  DeclEnumAbbrev = Stream.EmitAbbrev(Abv);
1443
1444  // Abbreviation for DECL_RECORD
1445  Abv = new BitCodeAbbrev();
1446  Abv->Add(BitCodeAbbrevOp(serialization::DECL_RECORD));
1447  // Redeclarable
1448  Abv->Add(BitCodeAbbrevOp(0));                       // First in file
1449  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // First ID
1450  // Decl
1451  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1452  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1453  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl (!?)
1454  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1455  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1456  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1457  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1458  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1459  Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1460  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1461  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1462  // NamedDecl
1463  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1464  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1465  // TypeDecl
1466  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1467  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1468  // TagDecl
1469  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1470  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1471  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1472  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1473  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1474  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1475  Abv->Add(BitCodeAbbrevOp(0));                         // hasExtInfo
1476  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // TypedefNameAnonDecl
1477  // RecordDecl
1478  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // FlexibleArrayMember
1479  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // AnonymousStructUnion
1480  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasObjectMember
1481  // DC
1482  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1483  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1484  DeclRecordAbbrev = Stream.EmitAbbrev(Abv);
1485
1486  // Abbreviation for DECL_PARM_VAR
1487  Abv = new BitCodeAbbrev();
1488  Abv->Add(BitCodeAbbrevOp(serialization::DECL_PARM_VAR));
1489  // Redeclarable
1490  Abv->Add(BitCodeAbbrevOp(0));                       // First in file
1491  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // First ID
1492  // Decl
1493  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1494  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1495  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl (!?)
1496  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1497  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1498  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1499  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1500  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1501  Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1502  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1503  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1504  // NamedDecl
1505  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1506  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1507  // ValueDecl
1508  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1509  // DeclaratorDecl
1510  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1511  Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1512  // VarDecl
1513  Abv->Add(BitCodeAbbrevOp(0));                       // StorageClass
1514  Abv->Add(BitCodeAbbrevOp(0));                       // StorageClassAsWritten
1515  Abv->Add(BitCodeAbbrevOp(0));                       // isThreadSpecified
1516  Abv->Add(BitCodeAbbrevOp(0));                       // hasCXXDirectInitializer
1517  Abv->Add(BitCodeAbbrevOp(0));                       // isExceptionVariable
1518  Abv->Add(BitCodeAbbrevOp(0));                       // isNRVOVariable
1519  Abv->Add(BitCodeAbbrevOp(0));                       // isCXXForRangeDecl
1520  Abv->Add(BitCodeAbbrevOp(0));                       // isARCPseudoStrong
1521  Abv->Add(BitCodeAbbrevOp(0));                       // HasInit
1522  Abv->Add(BitCodeAbbrevOp(0));                   // HasMemberSpecializationInfo
1523  // ParmVarDecl
1524  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsObjCMethodParameter
1525  Abv->Add(BitCodeAbbrevOp(0));                       // ScopeDepth
1526  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ScopeIndex
1527  Abv->Add(BitCodeAbbrevOp(0));                       // ObjCDeclQualifier
1528  Abv->Add(BitCodeAbbrevOp(0));                       // KNRPromoted
1529  Abv->Add(BitCodeAbbrevOp(0));                       // HasInheritedDefaultArg
1530  Abv->Add(BitCodeAbbrevOp(0));                   // HasUninstantiatedDefaultArg
1531  // Type Source Info
1532  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1533  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1534  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1535  DeclParmVarAbbrev = Stream.EmitAbbrev(Abv);
1536
1537  // Abbreviation for DECL_TYPEDEF
1538  Abv = new BitCodeAbbrev();
1539  Abv->Add(BitCodeAbbrevOp(serialization::DECL_TYPEDEF));
1540  // Redeclarable
1541  Abv->Add(BitCodeAbbrevOp(0));                       // First in file
1542  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // First ID
1543  // Decl
1544  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1545  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1546  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl (!?)
1547  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1548  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1549  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1550  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1551  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1552  Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1553  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1554  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1555  // NamedDecl
1556  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1557  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1558  // TypeDecl
1559  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1560  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1561  // TypedefDecl
1562  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1563  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1564  DeclTypedefAbbrev = Stream.EmitAbbrev(Abv);
1565
1566  // Abbreviation for DECL_VAR
1567  Abv = new BitCodeAbbrev();
1568  Abv->Add(BitCodeAbbrevOp(serialization::DECL_VAR));
1569  // Redeclarable
1570  Abv->Add(BitCodeAbbrevOp(0));                       // First in file
1571  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // First ID
1572  // Decl
1573  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1574  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1575  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl (!?)
1576  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1577  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1578  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1579  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1580  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1581  Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1582  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1583  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1584  // NamedDecl
1585  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1586  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1587  // ValueDecl
1588  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1589  // DeclaratorDecl
1590  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1591  Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1592  // VarDecl
1593  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // StorageClass
1594  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // StorageClassAsWritten
1595  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isThreadSpecified
1596  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // CXXDirectInitializer
1597  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isExceptionVariable
1598  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isNRVOVariable
1599  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCXXForRangeDecl
1600  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isARCPseudoStrong
1601  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // HasInit
1602  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // HasMemberSpecInfo
1603  // Type Source Info
1604  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1605  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1606  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1607  DeclVarAbbrev = Stream.EmitAbbrev(Abv);
1608
1609  // Abbreviation for EXPR_DECL_REF
1610  Abv = new BitCodeAbbrev();
1611  Abv->Add(BitCodeAbbrevOp(serialization::EXPR_DECL_REF));
1612  //Stmt
1613  //Expr
1614  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1615  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
1616  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
1617  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
1618  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
1619  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
1620  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
1621  //DeclRefExpr
1622  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HasQualifier
1623  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //GetDeclFound
1624  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ExplicitTemplateArgs
1625  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HadMultipleCandidates
1626  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclRef
1627  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1628  DeclRefExprAbbrev = Stream.EmitAbbrev(Abv);
1629
1630  // Abbreviation for EXPR_INTEGER_LITERAL
1631  Abv = new BitCodeAbbrev();
1632  Abv->Add(BitCodeAbbrevOp(serialization::EXPR_INTEGER_LITERAL));
1633  //Stmt
1634  //Expr
1635  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1636  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
1637  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
1638  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
1639  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
1640  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
1641  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
1642  //Integer Literal
1643  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1644  Abv->Add(BitCodeAbbrevOp(32));                      // Bit Width
1645  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Value
1646  IntegerLiteralAbbrev = Stream.EmitAbbrev(Abv);
1647
1648  // Abbreviation for EXPR_CHARACTER_LITERAL
1649  Abv = new BitCodeAbbrev();
1650  Abv->Add(BitCodeAbbrevOp(serialization::EXPR_CHARACTER_LITERAL));
1651  //Stmt
1652  //Expr
1653  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1654  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
1655  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
1656  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
1657  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
1658  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
1659  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
1660  //Character Literal
1661  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getValue
1662  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1663  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //IsWide
1664  CharacterLiteralAbbrev = Stream.EmitAbbrev(Abv);
1665
1666  Abv = new BitCodeAbbrev();
1667  Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_LEXICAL));
1668  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1669  DeclContextLexicalAbbrev = Stream.EmitAbbrev(Abv);
1670
1671  Abv = new BitCodeAbbrev();
1672  Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_VISIBLE));
1673  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1674  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1675  DeclContextVisibleLookupAbbrev = Stream.EmitAbbrev(Abv);
1676}
1677
1678/// isRequiredDecl - Check if this is a "required" Decl, which must be seen by
1679/// consumers of the AST.
1680///
1681/// Such decls will always be deserialized from the AST file, so we would like
1682/// this to be as restrictive as possible. Currently the predicate is driven by
1683/// code generation requirements, if other clients have a different notion of
1684/// what is "required" then we may have to consider an alternate scheme where
1685/// clients can iterate over the top-level decls and get information on them,
1686/// without necessary deserializing them. We could explicitly require such
1687/// clients to use a separate API call to "realize" the decl. This should be
1688/// relatively painless since they would presumably only do it for top-level
1689/// decls.
1690static bool isRequiredDecl(const Decl *D, ASTContext &Context) {
1691  // An ObjCMethodDecl is never considered as "required" because its
1692  // implementation container always is.
1693
1694  // File scoped assembly or obj-c implementation must be seen.
1695  if (isa<FileScopeAsmDecl>(D) || isa<ObjCImplDecl>(D))
1696    return true;
1697
1698  return Context.DeclMustBeEmitted(D);
1699}
1700
1701void ASTWriter::WriteDecl(ASTContext &Context, Decl *D) {
1702  // Switch case IDs are per Decl.
1703  ClearSwitchCaseIDs();
1704
1705  RecordData Record;
1706  ASTDeclWriter W(*this, Context, Record);
1707
1708  // If this declaration is also a DeclContext, write blocks for the
1709  // declarations that lexically stored inside its context and those
1710  // declarations that are visible from its context. These blocks
1711  // are written before the declaration itself so that we can put
1712  // their offsets into the record for the declaration.
1713  uint64_t LexicalOffset = 0;
1714  uint64_t VisibleOffset = 0;
1715  DeclContext *DC = dyn_cast<DeclContext>(D);
1716  if (DC) {
1717    LexicalOffset = WriteDeclContextLexicalBlock(Context, DC);
1718    VisibleOffset = WriteDeclContextVisibleBlock(Context, DC);
1719  }
1720
1721  // Determine the ID for this declaration
1722  serialization::DeclID &IDR = DeclIDs[D];
1723  if (IDR == 0)
1724    IDR = NextDeclID++;
1725  serialization::DeclID ID = IDR;
1726
1727  if (ID < FirstDeclID) {
1728    // We're replacing a decl in a previous file.
1729    ReplacedDecls.push_back(ReplacedDeclInfo(ID, Stream.GetCurrentBitNo(),
1730                                             D->getLocation()));
1731  } else {
1732    unsigned Index = ID - FirstDeclID;
1733
1734    // Record the offset for this declaration
1735    SourceLocation Loc = D->getLocation();
1736    if (DeclOffsets.size() == Index)
1737      DeclOffsets.push_back(DeclOffset(Loc, Stream.GetCurrentBitNo()));
1738    else if (DeclOffsets.size() < Index) {
1739      DeclOffsets.resize(Index+1);
1740      DeclOffsets[Index].setLocation(Loc);
1741      DeclOffsets[Index].BitOffset = Stream.GetCurrentBitNo();
1742    }
1743
1744    SourceManager &SM = Context.getSourceManager();
1745    if (Loc.isValid() && SM.isLocalSourceLocation(Loc))
1746      associateDeclWithFile(D, ID);
1747  }
1748
1749  // Build and emit a record for this declaration
1750  Record.clear();
1751  W.Code = (serialization::DeclCode)0;
1752  W.AbbrevToUse = 0;
1753  W.Visit(D);
1754  if (DC) W.VisitDeclContext(DC, LexicalOffset, VisibleOffset);
1755
1756  if (!W.Code)
1757    llvm::report_fatal_error(StringRef("unexpected declaration kind '") +
1758                            D->getDeclKindName() + "'");
1759  Stream.EmitRecord(W.Code, Record, W.AbbrevToUse);
1760
1761  // Flush any expressions that were written as part of this declaration.
1762  FlushStmts();
1763
1764  // Flush C++ base specifiers, if there are any.
1765  FlushCXXBaseSpecifiers();
1766
1767  // Note "external" declarations so that we can add them to a record in the
1768  // AST file later.
1769  //
1770  // FIXME: This should be renamed, the predicate is much more complicated.
1771  if (isRequiredDecl(D, Context))
1772    ExternalDefinitions.push_back(ID);
1773}
1774