ASTWriterDecl.cpp revision 3ac83d69c61238cd0d38e90fcdd03390530ab2fb 
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/DeclCXX.h"
17#include "clang/AST/DeclContextInternals.h"
18#include "clang/AST/DeclTemplate.h"
19#include "clang/AST/DeclVisitor.h"
20#include "clang/AST/Expr.h"
21#include "clang/Basic/SourceManager.h"
22#include "clang/Serialization/ASTReader.h"
23#include "llvm/ADT/Twine.h"
24#include "llvm/Bitcode/BitstreamWriter.h"
25#include "llvm/Support/ErrorHandling.h"
26using namespace clang;
27using namespace serialization;
28
29//===----------------------------------------------------------------------===//
30// Declaration serialization
31//===----------------------------------------------------------------------===//
32
33namespace clang {
34  class ASTDeclWriter : public DeclVisitor<ASTDeclWriter, void> {
35
36    ASTWriter &Writer;
37    ASTContext &Context;
38    typedef ASTWriter::RecordData RecordData;
39    RecordData &Record;
40
41  public:
42    serialization::DeclCode Code;
43    unsigned AbbrevToUse;
44
45    ASTDeclWriter(ASTWriter &Writer, ASTContext &Context, RecordData &Record)
46      : Writer(Writer), Context(Context), Record(Record) {
47    }
48
49    void Visit(Decl *D);
50
51    void VisitDecl(Decl *D);
52    void VisitTranslationUnitDecl(TranslationUnitDecl *D);
53    void VisitNamedDecl(NamedDecl *D);
54    void VisitLabelDecl(LabelDecl *LD);
55    void VisitNamespaceDecl(NamespaceDecl *D);
56    void VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
57    void VisitNamespaceAliasDecl(NamespaceAliasDecl *D);
58    void VisitTypeDecl(TypeDecl *D);
59    void VisitTypedefNameDecl(TypedefNameDecl *D);
60    void VisitTypedefDecl(TypedefDecl *D);
61    void VisitTypeAliasDecl(TypeAliasDecl *D);
62    void VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
63    void VisitTagDecl(TagDecl *D);
64    void VisitEnumDecl(EnumDecl *D);
65    void VisitRecordDecl(RecordDecl *D);
66    void VisitCXXRecordDecl(CXXRecordDecl *D);
67    void VisitClassTemplateSpecializationDecl(
68                                            ClassTemplateSpecializationDecl *D);
69    void VisitClassTemplatePartialSpecializationDecl(
70                                     ClassTemplatePartialSpecializationDecl *D);
71    void VisitClassScopeFunctionSpecializationDecl(
72                                       ClassScopeFunctionSpecializationDecl *D);
73    void VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D);
74    void VisitValueDecl(ValueDecl *D);
75    void VisitEnumConstantDecl(EnumConstantDecl *D);
76    void VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
77    void VisitDeclaratorDecl(DeclaratorDecl *D);
78    void VisitFunctionDecl(FunctionDecl *D);
79    void VisitCXXMethodDecl(CXXMethodDecl *D);
80    void VisitCXXConstructorDecl(CXXConstructorDecl *D);
81    void VisitCXXDestructorDecl(CXXDestructorDecl *D);
82    void VisitCXXConversionDecl(CXXConversionDecl *D);
83    void VisitFieldDecl(FieldDecl *D);
84    void VisitIndirectFieldDecl(IndirectFieldDecl *D);
85    void VisitVarDecl(VarDecl *D);
86    void VisitImplicitParamDecl(ImplicitParamDecl *D);
87    void VisitParmVarDecl(ParmVarDecl *D);
88    void VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D);
89    void VisitTemplateDecl(TemplateDecl *D);
90    void VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D);
91    void VisitClassTemplateDecl(ClassTemplateDecl *D);
92    void VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
93    void VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D);
94    void VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D);
95    void VisitUsingDecl(UsingDecl *D);
96    void VisitUsingShadowDecl(UsingShadowDecl *D);
97    void VisitLinkageSpecDecl(LinkageSpecDecl *D);
98    void VisitFileScopeAsmDecl(FileScopeAsmDecl *D);
99    void VisitImportDecl(ImportDecl *D);
100    void VisitAccessSpecDecl(AccessSpecDecl *D);
101    void VisitFriendDecl(FriendDecl *D);
102    void VisitFriendTemplateDecl(FriendTemplateDecl *D);
103    void VisitStaticAssertDecl(StaticAssertDecl *D);
104    void VisitBlockDecl(BlockDecl *D);
105
106    void VisitDeclContext(DeclContext *DC, uint64_t LexicalOffset,
107                          uint64_t VisibleOffset);
108    template <typename T> void VisitRedeclarable(Redeclarable<T> *D);
109
110
111    // FIXME: Put in the same order is DeclNodes.td?
112    void VisitObjCMethodDecl(ObjCMethodDecl *D);
113    void VisitObjCContainerDecl(ObjCContainerDecl *D);
114    void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
115    void VisitObjCIvarDecl(ObjCIvarDecl *D);
116    void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
117    void VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *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
128void ASTDeclWriter::Visit(Decl *D) {
129  DeclVisitor<ASTDeclWriter>::Visit(D);
130
131  // Source locations require array (variable-length) abbreviations.  The
132  // abbreviation infrastructure requires that arrays are encoded last, so
133  // we handle it here in the case of those classes derived from DeclaratorDecl
134  if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)){
135    Writer.AddTypeSourceInfo(DD->getTypeSourceInfo(), Record);
136  }
137
138  // Handle FunctionDecl's body here and write it after all other Stmts/Exprs
139  // have been written. We want it last because we will not read it back when
140  // retrieving it from the AST, we'll just lazily set the offset.
141  if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
142    Record.push_back(FD->doesThisDeclarationHaveABody());
143    if (FD->doesThisDeclarationHaveABody())
144      Writer.AddStmt(FD->getBody());
145  }
146}
147
148void ASTDeclWriter::VisitDecl(Decl *D) {
149  Writer.AddDeclRef(cast_or_null<Decl>(D->getDeclContext()), Record);
150  Writer.AddDeclRef(cast_or_null<Decl>(D->getLexicalDeclContext()), Record);
151  Record.push_back(D->isInvalidDecl());
152  Record.push_back(D->hasAttrs());
153  if (D->hasAttrs())
154    Writer.WriteAttributes(ArrayRef<const Attr*>(D->getAttrs().begin(),
155                                                 D->getAttrs().size()), Record);
156  Record.push_back(D->isImplicit());
157  Record.push_back(D->isUsed(false));
158  Record.push_back(D->isReferenced());
159  Record.push_back(D->isTopLevelDeclInObjCContainer());
160  Record.push_back(D->getAccess());
161  Record.push_back(D->isModulePrivate());
162  Record.push_back(Writer.inferSubmoduleIDFromLocation(D->getLocation()));
163}
164
165void ASTDeclWriter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
166  llvm_unreachable("Translation units aren't directly serialized");
167}
168
169void ASTDeclWriter::VisitNamedDecl(NamedDecl *D) {
170  VisitDecl(D);
171  Writer.AddDeclarationName(D->getDeclName(), Record);
172}
173
174void ASTDeclWriter::VisitTypeDecl(TypeDecl *D) {
175  VisitNamedDecl(D);
176  Writer.AddSourceLocation(D->getLocStart(), Record);
177  Writer.AddTypeRef(QualType(D->getTypeForDecl(), 0), Record);
178}
179
180void ASTDeclWriter::VisitTypedefNameDecl(TypedefNameDecl *D) {
181  VisitRedeclarable(D);
182  VisitTypeDecl(D);
183  Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record);
184}
185
186void ASTDeclWriter::VisitTypedefDecl(TypedefDecl *D) {
187  VisitTypedefNameDecl(D);
188  if (!D->hasAttrs() &&
189      !D->isImplicit() &&
190      !D->isUsed(false) &&
191      D->getFirstDeclaration() == D->getMostRecentDecl() &&
192      !D->isInvalidDecl() &&
193      !D->isReferenced() &&
194      !D->isTopLevelDeclInObjCContainer() &&
195      D->getAccess() == AS_none &&
196      !D->isModulePrivate() &&
197      D->getDeclName().getNameKind() == DeclarationName::Identifier)
198    AbbrevToUse = Writer.getDeclTypedefAbbrev();
199
200  Code = serialization::DECL_TYPEDEF;
201}
202
203void ASTDeclWriter::VisitTypeAliasDecl(TypeAliasDecl *D) {
204  VisitTypedefNameDecl(D);
205  Code = serialization::DECL_TYPEALIAS;
206}
207
208void ASTDeclWriter::VisitTagDecl(TagDecl *D) {
209  VisitRedeclarable(D);
210  VisitTypeDecl(D);
211  Record.push_back(D->getIdentifierNamespace());
212  Record.push_back((unsigned)D->getTagKind()); // FIXME: stable encoding
213  Record.push_back(D->isCompleteDefinition());
214  Record.push_back(D->isEmbeddedInDeclarator());
215  Record.push_back(D->isFreeStanding());
216  Writer.AddSourceLocation(D->getRBraceLoc(), Record);
217  Record.push_back(D->hasExtInfo());
218  if (D->hasExtInfo())
219    Writer.AddQualifierInfo(*D->getExtInfo(), Record);
220  else
221    Writer.AddDeclRef(D->getTypedefNameForAnonDecl(), Record);
222}
223
224void ASTDeclWriter::VisitEnumDecl(EnumDecl *D) {
225  VisitTagDecl(D);
226  Writer.AddTypeSourceInfo(D->getIntegerTypeSourceInfo(), Record);
227  if (!D->getIntegerTypeSourceInfo())
228    Writer.AddTypeRef(D->getIntegerType(), Record);
229  Writer.AddTypeRef(D->getPromotionType(), Record);
230  Record.push_back(D->getNumPositiveBits());
231  Record.push_back(D->getNumNegativeBits());
232  Record.push_back(D->isScoped());
233  Record.push_back(D->isScopedUsingClassTag());
234  Record.push_back(D->isFixed());
235  if (MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo()) {
236    Writer.AddDeclRef(MemberInfo->getInstantiatedFrom(), Record);
237    Record.push_back(MemberInfo->getTemplateSpecializationKind());
238    Writer.AddSourceLocation(MemberInfo->getPointOfInstantiation(), Record);
239  } else {
240    Writer.AddDeclRef(0, Record);
241  }
242
243  if (!D->hasAttrs() &&
244      !D->isImplicit() &&
245      !D->isUsed(false) &&
246      !D->hasExtInfo() &&
247      D->getFirstDeclaration() == D->getMostRecentDecl() &&
248      !D->isInvalidDecl() &&
249      !D->isReferenced() &&
250      !D->isTopLevelDeclInObjCContainer() &&
251      D->getAccess() == AS_none &&
252      !D->isModulePrivate() &&
253      !CXXRecordDecl::classofKind(D->getKind()) &&
254      !D->getIntegerTypeSourceInfo() &&
255      D->getDeclName().getNameKind() == DeclarationName::Identifier)
256    AbbrevToUse = Writer.getDeclEnumAbbrev();
257
258  Code = serialization::DECL_ENUM;
259}
260
261void ASTDeclWriter::VisitRecordDecl(RecordDecl *D) {
262  VisitTagDecl(D);
263  Record.push_back(D->hasFlexibleArrayMember());
264  Record.push_back(D->isAnonymousStructOrUnion());
265  Record.push_back(D->hasObjectMember());
266  Record.push_back(D->hasVolatileMember());
267
268  if (!D->hasAttrs() &&
269      !D->isImplicit() &&
270      !D->isUsed(false) &&
271      !D->hasExtInfo() &&
272      D->getFirstDeclaration() == D->getMostRecentDecl() &&
273      !D->isInvalidDecl() &&
274      !D->isReferenced() &&
275      !D->isTopLevelDeclInObjCContainer() &&
276      D->getAccess() == AS_none &&
277      !D->isModulePrivate() &&
278      !CXXRecordDecl::classofKind(D->getKind()) &&
279      D->getDeclName().getNameKind() == DeclarationName::Identifier)
280    AbbrevToUse = Writer.getDeclRecordAbbrev();
281
282  Code = serialization::DECL_RECORD;
283}
284
285void ASTDeclWriter::VisitValueDecl(ValueDecl *D) {
286  VisitNamedDecl(D);
287  Writer.AddTypeRef(D->getType(), Record);
288}
289
290void ASTDeclWriter::VisitEnumConstantDecl(EnumConstantDecl *D) {
291  VisitValueDecl(D);
292  Record.push_back(D->getInitExpr()? 1 : 0);
293  if (D->getInitExpr())
294    Writer.AddStmt(D->getInitExpr());
295  Writer.AddAPSInt(D->getInitVal(), Record);
296
297  Code = serialization::DECL_ENUM_CONSTANT;
298}
299
300void ASTDeclWriter::VisitDeclaratorDecl(DeclaratorDecl *D) {
301  VisitValueDecl(D);
302  Writer.AddSourceLocation(D->getInnerLocStart(), Record);
303  Record.push_back(D->hasExtInfo());
304  if (D->hasExtInfo())
305    Writer.AddQualifierInfo(*D->getExtInfo(), Record);
306}
307
308void ASTDeclWriter::VisitFunctionDecl(FunctionDecl *D) {
309  VisitRedeclarable(D);
310  VisitDeclaratorDecl(D);
311
312  Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
313  Record.push_back(D->getIdentifierNamespace());
314
315  // FunctionDecl's body is handled last at ASTWriterDecl::Visit,
316  // after everything else is written.
317
318  Record.push_back(D->getStorageClass()); // FIXME: stable encoding
319  Record.push_back(D->getStorageClassAsWritten());
320  Record.push_back(D->IsInline);
321  Record.push_back(D->isInlineSpecified());
322  Record.push_back(D->isVirtualAsWritten());
323  Record.push_back(D->isPure());
324  Record.push_back(D->hasInheritedPrototype());
325  Record.push_back(D->hasWrittenPrototype());
326  Record.push_back(D->isDeletedAsWritten());
327  Record.push_back(D->isTrivial());
328  Record.push_back(D->isDefaulted());
329  Record.push_back(D->isExplicitlyDefaulted());
330  Record.push_back(D->hasImplicitReturnZero());
331  Record.push_back(D->isConstexpr());
332  Record.push_back(D->HasSkippedBody);
333  Writer.AddSourceLocation(D->getLocEnd(), Record);
334
335  Record.push_back(D->getTemplatedKind());
336  switch (D->getTemplatedKind()) {
337  case FunctionDecl::TK_NonTemplate:
338    break;
339  case FunctionDecl::TK_FunctionTemplate:
340    Writer.AddDeclRef(D->getDescribedFunctionTemplate(), Record);
341    break;
342  case FunctionDecl::TK_MemberSpecialization: {
343    MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo();
344    Writer.AddDeclRef(MemberInfo->getInstantiatedFrom(), Record);
345    Record.push_back(MemberInfo->getTemplateSpecializationKind());
346    Writer.AddSourceLocation(MemberInfo->getPointOfInstantiation(), Record);
347    break;
348  }
349  case FunctionDecl::TK_FunctionTemplateSpecialization: {
350    FunctionTemplateSpecializationInfo *
351      FTSInfo = D->getTemplateSpecializationInfo();
352    Writer.AddDeclRef(FTSInfo->getTemplate(), Record);
353    Record.push_back(FTSInfo->getTemplateSpecializationKind());
354
355    // Template arguments.
356    Writer.AddTemplateArgumentList(FTSInfo->TemplateArguments, Record);
357
358    // Template args as written.
359    Record.push_back(FTSInfo->TemplateArgumentsAsWritten != 0);
360    if (FTSInfo->TemplateArgumentsAsWritten) {
361      Record.push_back(FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs);
362      for (int i=0, e = FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs;
363             i!=e; ++i)
364        Writer.AddTemplateArgumentLoc((*FTSInfo->TemplateArgumentsAsWritten)[i],
365                                      Record);
366      Writer.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->LAngleLoc,
367                               Record);
368      Writer.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->RAngleLoc,
369                               Record);
370    }
371
372    Writer.AddSourceLocation(FTSInfo->getPointOfInstantiation(), Record);
373
374    if (D->isCanonicalDecl()) {
375      // Write the template that contains the specializations set. We will
376      // add a FunctionTemplateSpecializationInfo to it when reading.
377      Writer.AddDeclRef(FTSInfo->getTemplate()->getCanonicalDecl(), Record);
378    }
379    break;
380  }
381  case FunctionDecl::TK_DependentFunctionTemplateSpecialization: {
382    DependentFunctionTemplateSpecializationInfo *
383      DFTSInfo = D->getDependentSpecializationInfo();
384
385    // Templates.
386    Record.push_back(DFTSInfo->getNumTemplates());
387    for (int i=0, e = DFTSInfo->getNumTemplates(); i != e; ++i)
388      Writer.AddDeclRef(DFTSInfo->getTemplate(i), Record);
389
390    // Templates args.
391    Record.push_back(DFTSInfo->getNumTemplateArgs());
392    for (int i=0, e = DFTSInfo->getNumTemplateArgs(); i != e; ++i)
393      Writer.AddTemplateArgumentLoc(DFTSInfo->getTemplateArg(i), Record);
394    Writer.AddSourceLocation(DFTSInfo->getLAngleLoc(), Record);
395    Writer.AddSourceLocation(DFTSInfo->getRAngleLoc(), Record);
396    break;
397  }
398  }
399
400  Record.push_back(D->param_size());
401  for (FunctionDecl::param_iterator P = D->param_begin(), PEnd = D->param_end();
402       P != PEnd; ++P)
403    Writer.AddDeclRef(*P, Record);
404  Code = serialization::DECL_FUNCTION;
405}
406
407void ASTDeclWriter::VisitObjCMethodDecl(ObjCMethodDecl *D) {
408  VisitNamedDecl(D);
409  // FIXME: convert to LazyStmtPtr?
410  // Unlike C/C++, method bodies will never be in header files.
411  bool HasBodyStuff = D->getBody() != 0     ||
412                      D->getSelfDecl() != 0 || D->getCmdDecl() != 0;
413  Record.push_back(HasBodyStuff);
414  if (HasBodyStuff) {
415    Writer.AddStmt(D->getBody());
416    Writer.AddDeclRef(D->getSelfDecl(), Record);
417    Writer.AddDeclRef(D->getCmdDecl(), Record);
418  }
419  Record.push_back(D->isInstanceMethod());
420  Record.push_back(D->isVariadic());
421  Record.push_back(D->isPropertyAccessor());
422  Record.push_back(D->isDefined());
423  Record.push_back(D->IsOverriding);
424  Record.push_back(D->HasSkippedBody);
425
426  Record.push_back(D->IsRedeclaration);
427  Record.push_back(D->HasRedeclaration);
428  if (D->HasRedeclaration) {
429    assert(Context.getObjCMethodRedeclaration(D));
430    Writer.AddDeclRef(Context.getObjCMethodRedeclaration(D), Record);
431  }
432
433  // FIXME: stable encoding for @required/@optional
434  Record.push_back(D->getImplementationControl());
435  // FIXME: stable encoding for in/out/inout/bycopy/byref/oneway
436  Record.push_back(D->getObjCDeclQualifier());
437  Record.push_back(D->hasRelatedResultType());
438  Writer.AddTypeRef(D->getResultType(), Record);
439  Writer.AddTypeSourceInfo(D->getResultTypeSourceInfo(), Record);
440  Writer.AddSourceLocation(D->getLocEnd(), Record);
441  Record.push_back(D->param_size());
442  for (ObjCMethodDecl::param_iterator P = D->param_begin(),
443                                   PEnd = D->param_end(); P != PEnd; ++P)
444    Writer.AddDeclRef(*P, Record);
445
446  Record.push_back(D->SelLocsKind);
447  unsigned NumStoredSelLocs = D->getNumStoredSelLocs();
448  SourceLocation *SelLocs = D->getStoredSelLocs();
449  Record.push_back(NumStoredSelLocs);
450  for (unsigned i = 0; i != NumStoredSelLocs; ++i)
451    Writer.AddSourceLocation(SelLocs[i], Record);
452
453  Code = serialization::DECL_OBJC_METHOD;
454}
455
456void ASTDeclWriter::VisitObjCContainerDecl(ObjCContainerDecl *D) {
457  VisitNamedDecl(D);
458  Writer.AddSourceLocation(D->getAtStartLoc(), Record);
459  Writer.AddSourceRange(D->getAtEndRange(), Record);
460  // Abstract class (no need to define a stable serialization::DECL code).
461}
462
463void ASTDeclWriter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *D) {
464  VisitRedeclarable(D);
465  VisitObjCContainerDecl(D);
466  Writer.AddTypeRef(QualType(D->getTypeForDecl(), 0), Record);
467
468  Record.push_back(D->isThisDeclarationADefinition());
469  if (D->isThisDeclarationADefinition()) {
470    // Write the DefinitionData
471    ObjCInterfaceDecl::DefinitionData &Data = D->data();
472
473    Writer.AddDeclRef(D->getSuperClass(), Record);
474    Writer.AddSourceLocation(D->getSuperClassLoc(), Record);
475    Writer.AddSourceLocation(D->getEndOfDefinitionLoc(), Record);
476
477    // Write out the protocols that are directly referenced by the @interface.
478    Record.push_back(Data.ReferencedProtocols.size());
479    for (ObjCInterfaceDecl::protocol_iterator P = D->protocol_begin(),
480                                           PEnd = D->protocol_end();
481         P != PEnd; ++P)
482      Writer.AddDeclRef(*P, Record);
483    for (ObjCInterfaceDecl::protocol_loc_iterator PL = D->protocol_loc_begin(),
484         PLEnd = D->protocol_loc_end();
485         PL != PLEnd; ++PL)
486      Writer.AddSourceLocation(*PL, Record);
487
488    // Write out the protocols that are transitively referenced.
489    Record.push_back(Data.AllReferencedProtocols.size());
490    for (ObjCList<ObjCProtocolDecl>::iterator
491              P = Data.AllReferencedProtocols.begin(),
492           PEnd = Data.AllReferencedProtocols.end();
493         P != PEnd; ++P)
494      Writer.AddDeclRef(*P, Record);
495
496
497    if (ObjCCategoryDecl *Cat = D->getCategoryListRaw()) {
498      // Ensure that we write out the set of categories for this class.
499      Writer.ObjCClassesWithCategories.insert(D);
500
501      // Make sure that the categories get serialized.
502      for (; Cat; Cat = Cat->getNextClassCategoryRaw())
503        (void)Writer.GetDeclRef(Cat);
504    }
505  }
506
507  Code = serialization::DECL_OBJC_INTERFACE;
508}
509
510void ASTDeclWriter::VisitObjCIvarDecl(ObjCIvarDecl *D) {
511  VisitFieldDecl(D);
512  // FIXME: stable encoding for @public/@private/@protected/@package
513  Record.push_back(D->getAccessControl());
514  Record.push_back(D->getSynthesize());
515
516  if (!D->hasAttrs() &&
517      !D->isImplicit() &&
518      !D->isUsed(false) &&
519      !D->isInvalidDecl() &&
520      !D->isReferenced() &&
521      !D->isModulePrivate() &&
522      !D->getBitWidth() &&
523      !D->hasExtInfo() &&
524      D->getDeclName())
525    AbbrevToUse = Writer.getDeclObjCIvarAbbrev();
526
527  Code = serialization::DECL_OBJC_IVAR;
528}
529
530void ASTDeclWriter::VisitObjCProtocolDecl(ObjCProtocolDecl *D) {
531  VisitRedeclarable(D);
532  VisitObjCContainerDecl(D);
533
534  Record.push_back(D->isThisDeclarationADefinition());
535  if (D->isThisDeclarationADefinition()) {
536    Record.push_back(D->protocol_size());
537    for (ObjCProtocolDecl::protocol_iterator
538         I = D->protocol_begin(), IEnd = D->protocol_end(); I != IEnd; ++I)
539      Writer.AddDeclRef(*I, Record);
540    for (ObjCProtocolDecl::protocol_loc_iterator PL = D->protocol_loc_begin(),
541           PLEnd = D->protocol_loc_end();
542         PL != PLEnd; ++PL)
543      Writer.AddSourceLocation(*PL, Record);
544  }
545
546  Code = serialization::DECL_OBJC_PROTOCOL;
547}
548
549void ASTDeclWriter::VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D) {
550  VisitFieldDecl(D);
551  Code = serialization::DECL_OBJC_AT_DEFS_FIELD;
552}
553
554void ASTDeclWriter::VisitObjCCategoryDecl(ObjCCategoryDecl *D) {
555  VisitObjCContainerDecl(D);
556  Writer.AddSourceLocation(D->getCategoryNameLoc(), Record);
557  Writer.AddSourceLocation(D->getIvarLBraceLoc(), Record);
558  Writer.AddSourceLocation(D->getIvarRBraceLoc(), Record);
559  Writer.AddDeclRef(D->getClassInterface(), Record);
560  Record.push_back(D->protocol_size());
561  for (ObjCCategoryDecl::protocol_iterator
562       I = D->protocol_begin(), IEnd = D->protocol_end(); I != IEnd; ++I)
563    Writer.AddDeclRef(*I, Record);
564  for (ObjCCategoryDecl::protocol_loc_iterator
565         PL = D->protocol_loc_begin(), PLEnd = D->protocol_loc_end();
566       PL != PLEnd; ++PL)
567    Writer.AddSourceLocation(*PL, Record);
568  Code = serialization::DECL_OBJC_CATEGORY;
569}
570
571void ASTDeclWriter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D) {
572  VisitNamedDecl(D);
573  Writer.AddDeclRef(D->getClassInterface(), Record);
574  Code = serialization::DECL_OBJC_COMPATIBLE_ALIAS;
575}
576
577void ASTDeclWriter::VisitObjCPropertyDecl(ObjCPropertyDecl *D) {
578  VisitNamedDecl(D);
579  Writer.AddSourceLocation(D->getAtLoc(), Record);
580  Writer.AddSourceLocation(D->getLParenLoc(), Record);
581  Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record);
582  // FIXME: stable encoding
583  Record.push_back((unsigned)D->getPropertyAttributes());
584  Record.push_back((unsigned)D->getPropertyAttributesAsWritten());
585  // FIXME: stable encoding
586  Record.push_back((unsigned)D->getPropertyImplementation());
587  Writer.AddDeclarationName(D->getGetterName(), Record);
588  Writer.AddDeclarationName(D->getSetterName(), Record);
589  Writer.AddDeclRef(D->getGetterMethodDecl(), Record);
590  Writer.AddDeclRef(D->getSetterMethodDecl(), Record);
591  Writer.AddDeclRef(D->getPropertyIvarDecl(), Record);
592  Code = serialization::DECL_OBJC_PROPERTY;
593}
594
595void ASTDeclWriter::VisitObjCImplDecl(ObjCImplDecl *D) {
596  VisitObjCContainerDecl(D);
597  Writer.AddDeclRef(D->getClassInterface(), Record);
598  // Abstract class (no need to define a stable serialization::DECL code).
599}
600
601void ASTDeclWriter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D) {
602  VisitObjCImplDecl(D);
603  Writer.AddIdentifierRef(D->getIdentifier(), Record);
604  Writer.AddSourceLocation(D->getCategoryNameLoc(), Record);
605  Code = serialization::DECL_OBJC_CATEGORY_IMPL;
606}
607
608void ASTDeclWriter::VisitObjCImplementationDecl(ObjCImplementationDecl *D) {
609  VisitObjCImplDecl(D);
610  Writer.AddDeclRef(D->getSuperClass(), Record);
611  Writer.AddSourceLocation(D->getIvarLBraceLoc(), Record);
612  Writer.AddSourceLocation(D->getIvarRBraceLoc(), Record);
613  Record.push_back(D->hasNonZeroConstructors());
614  Record.push_back(D->hasDestructors());
615  Writer.AddCXXCtorInitializers(D->IvarInitializers, D->NumIvarInitializers,
616                                Record);
617  Code = serialization::DECL_OBJC_IMPLEMENTATION;
618}
619
620void ASTDeclWriter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D) {
621  VisitDecl(D);
622  Writer.AddSourceLocation(D->getLocStart(), Record);
623  Writer.AddDeclRef(D->getPropertyDecl(), Record);
624  Writer.AddDeclRef(D->getPropertyIvarDecl(), Record);
625  Writer.AddSourceLocation(D->getPropertyIvarDeclLoc(), Record);
626  Writer.AddStmt(D->getGetterCXXConstructor());
627  Writer.AddStmt(D->getSetterCXXAssignment());
628  Code = serialization::DECL_OBJC_PROPERTY_IMPL;
629}
630
631void ASTDeclWriter::VisitFieldDecl(FieldDecl *D) {
632  VisitDeclaratorDecl(D);
633  Record.push_back(D->isMutable());
634  if (D->InitializerOrBitWidth.getInt() != ICIS_NoInit ||
635      D->InitializerOrBitWidth.getPointer()) {
636    Record.push_back(D->InitializerOrBitWidth.getInt() + 1);
637    Writer.AddStmt(D->InitializerOrBitWidth.getPointer());
638  } else {
639    Record.push_back(0);
640  }
641  if (!D->getDeclName())
642    Writer.AddDeclRef(Context.getInstantiatedFromUnnamedFieldDecl(D), Record);
643
644  if (!D->hasAttrs() &&
645      !D->isImplicit() &&
646      !D->isUsed(false) &&
647      !D->isInvalidDecl() &&
648      !D->isReferenced() &&
649      !D->isTopLevelDeclInObjCContainer() &&
650      !D->isModulePrivate() &&
651      !D->getBitWidth() &&
652      !D->hasInClassInitializer() &&
653      !D->hasExtInfo() &&
654      !ObjCIvarDecl::classofKind(D->getKind()) &&
655      !ObjCAtDefsFieldDecl::classofKind(D->getKind()) &&
656      D->getDeclName())
657    AbbrevToUse = Writer.getDeclFieldAbbrev();
658
659  Code = serialization::DECL_FIELD;
660}
661
662void ASTDeclWriter::VisitIndirectFieldDecl(IndirectFieldDecl *D) {
663  VisitValueDecl(D);
664  Record.push_back(D->getChainingSize());
665
666  for (IndirectFieldDecl::chain_iterator
667       P = D->chain_begin(),
668       PEnd = D->chain_end(); P != PEnd; ++P)
669    Writer.AddDeclRef(*P, Record);
670  Code = serialization::DECL_INDIRECTFIELD;
671}
672
673void ASTDeclWriter::VisitVarDecl(VarDecl *D) {
674  VisitRedeclarable(D);
675  VisitDeclaratorDecl(D);
676  Record.push_back(D->getStorageClass()); // FIXME: stable encoding
677  Record.push_back(D->getStorageClassAsWritten());
678  Record.push_back(D->isThreadSpecified());
679  Record.push_back(D->getInitStyle());
680  Record.push_back(D->isExceptionVariable());
681  Record.push_back(D->isNRVOVariable());
682  Record.push_back(D->isCXXForRangeDecl());
683  Record.push_back(D->isARCPseudoStrong());
684  Record.push_back(D->isConstexpr());
685
686  if (D->getInit()) {
687    Record.push_back(!D->isInitKnownICE() ? 1 : (D->isInitICE() ? 3 : 2));
688    Writer.AddStmt(D->getInit());
689  } else {
690    Record.push_back(0);
691  }
692
693  MemberSpecializationInfo *SpecInfo
694    = D->isStaticDataMember() ? D->getMemberSpecializationInfo() : 0;
695  Record.push_back(SpecInfo != 0);
696  if (SpecInfo) {
697    Writer.AddDeclRef(SpecInfo->getInstantiatedFrom(), Record);
698    Record.push_back(SpecInfo->getTemplateSpecializationKind());
699    Writer.AddSourceLocation(SpecInfo->getPointOfInstantiation(), Record);
700  }
701
702  if (!D->hasAttrs() &&
703      !D->isImplicit() &&
704      !D->isUsed(false) &&
705      !D->isInvalidDecl() &&
706      !D->isReferenced() &&
707      !D->isTopLevelDeclInObjCContainer() &&
708      D->getAccess() == AS_none &&
709      !D->isModulePrivate() &&
710      D->getDeclName().getNameKind() == DeclarationName::Identifier &&
711      !D->hasExtInfo() &&
712      D->getFirstDeclaration() == D->getMostRecentDecl() &&
713      D->getInitStyle() == VarDecl::CInit &&
714      D->getInit() == 0 &&
715      !isa<ParmVarDecl>(D) &&
716      !D->isConstexpr() &&
717      !SpecInfo)
718    AbbrevToUse = Writer.getDeclVarAbbrev();
719
720  Code = serialization::DECL_VAR;
721}
722
723void ASTDeclWriter::VisitImplicitParamDecl(ImplicitParamDecl *D) {
724  VisitVarDecl(D);
725  Code = serialization::DECL_IMPLICIT_PARAM;
726}
727
728void ASTDeclWriter::VisitParmVarDecl(ParmVarDecl *D) {
729  VisitVarDecl(D);
730  Record.push_back(D->isObjCMethodParameter());
731  Record.push_back(D->getFunctionScopeDepth());
732  Record.push_back(D->getFunctionScopeIndex());
733  Record.push_back(D->getObjCDeclQualifier()); // FIXME: stable encoding
734  Record.push_back(D->isKNRPromoted());
735  Record.push_back(D->hasInheritedDefaultArg());
736  Record.push_back(D->hasUninstantiatedDefaultArg());
737  if (D->hasUninstantiatedDefaultArg())
738    Writer.AddStmt(D->getUninstantiatedDefaultArg());
739  Code = serialization::DECL_PARM_VAR;
740
741  assert(!D->isARCPseudoStrong()); // can be true of ImplicitParamDecl
742
743  // If the assumptions about the DECL_PARM_VAR abbrev are true, use it.  Here
744  // we dynamically check for the properties that we optimize for, but don't
745  // know are true of all PARM_VAR_DECLs.
746  if (!D->hasAttrs() &&
747      !D->hasExtInfo() &&
748      !D->isImplicit() &&
749      !D->isUsed(false) &&
750      !D->isInvalidDecl() &&
751      !D->isReferenced() &&
752      D->getAccess() == AS_none &&
753      !D->isModulePrivate() &&
754      D->getStorageClass() == 0 &&
755      D->getInitStyle() == VarDecl::CInit && // Can params have anything else?
756      D->getFunctionScopeDepth() == 0 &&
757      D->getObjCDeclQualifier() == 0 &&
758      !D->isKNRPromoted() &&
759      !D->hasInheritedDefaultArg() &&
760      D->getInit() == 0 &&
761      !D->hasUninstantiatedDefaultArg())  // No default expr.
762    AbbrevToUse = Writer.getDeclParmVarAbbrev();
763
764  // Check things we know are true of *every* PARM_VAR_DECL, which is more than
765  // just us assuming it.
766  assert(!D->isThreadSpecified() && "PARM_VAR_DECL can't be __thread");
767  assert(D->getAccess() == AS_none && "PARM_VAR_DECL can't be public/private");
768  assert(!D->isExceptionVariable() && "PARM_VAR_DECL can't be exception var");
769  assert(D->getPreviousDecl() == 0 && "PARM_VAR_DECL can't be redecl");
770  assert(!D->isStaticDataMember() &&
771         "PARM_VAR_DECL can't be static data member");
772}
773
774void ASTDeclWriter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
775  VisitDecl(D);
776  Writer.AddStmt(D->getAsmString());
777  Writer.AddSourceLocation(D->getRParenLoc(), Record);
778  Code = serialization::DECL_FILE_SCOPE_ASM;
779}
780
781void ASTDeclWriter::VisitBlockDecl(BlockDecl *D) {
782  VisitDecl(D);
783  Writer.AddStmt(D->getBody());
784  Writer.AddTypeSourceInfo(D->getSignatureAsWritten(), Record);
785  Record.push_back(D->param_size());
786  for (FunctionDecl::param_iterator P = D->param_begin(), PEnd = D->param_end();
787       P != PEnd; ++P)
788    Writer.AddDeclRef(*P, Record);
789  Record.push_back(D->isVariadic());
790  Record.push_back(D->blockMissingReturnType());
791  Record.push_back(D->isConversionFromLambda());
792  Record.push_back(D->capturesCXXThis());
793  Record.push_back(D->getNumCaptures());
794  for (BlockDecl::capture_iterator
795         i = D->capture_begin(), e = D->capture_end(); i != e; ++i) {
796    const BlockDecl::Capture &capture = *i;
797    Writer.AddDeclRef(capture.getVariable(), Record);
798
799    unsigned flags = 0;
800    if (capture.isByRef()) flags |= 1;
801    if (capture.isNested()) flags |= 2;
802    if (capture.hasCopyExpr()) flags |= 4;
803    Record.push_back(flags);
804
805    if (capture.hasCopyExpr()) Writer.AddStmt(capture.getCopyExpr());
806  }
807
808  Code = serialization::DECL_BLOCK;
809}
810
811void ASTDeclWriter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
812  VisitDecl(D);
813  Record.push_back(D->getLanguage());
814  Writer.AddSourceLocation(D->getExternLoc(), Record);
815  Writer.AddSourceLocation(D->getRBraceLoc(), Record);
816  Code = serialization::DECL_LINKAGE_SPEC;
817}
818
819void ASTDeclWriter::VisitLabelDecl(LabelDecl *D) {
820  VisitNamedDecl(D);
821  Writer.AddSourceLocation(D->getLocStart(), Record);
822  Code = serialization::DECL_LABEL;
823}
824
825
826void ASTDeclWriter::VisitNamespaceDecl(NamespaceDecl *D) {
827  VisitRedeclarable(D);
828  VisitNamedDecl(D);
829  Record.push_back(D->isInline());
830  Writer.AddSourceLocation(D->getLocStart(), Record);
831  Writer.AddSourceLocation(D->getRBraceLoc(), Record);
832
833  if (D->isOriginalNamespace())
834    Writer.AddDeclRef(D->getAnonymousNamespace(), Record);
835  Code = serialization::DECL_NAMESPACE;
836
837  if (Writer.hasChain() && !D->isOriginalNamespace() &&
838      D->getOriginalNamespace()->isFromASTFile()) {
839    NamespaceDecl *NS = D->getOriginalNamespace();
840    Writer.AddUpdatedDeclContext(NS);
841
842    // Make sure all visible decls are written. They will be recorded later.
843    if (StoredDeclsMap *Map = NS->buildLookup()) {
844      for (StoredDeclsMap::iterator D = Map->begin(), DEnd = Map->end();
845           D != DEnd; ++D) {
846        DeclContext::lookup_result R = D->second.getLookupResult();
847        for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E;
848             ++I)
849          Writer.GetDeclRef(*I);
850      }
851    }
852  }
853
854  if (Writer.hasChain() && D->isAnonymousNamespace() &&
855      D == D->getMostRecentDecl()) {
856    // This is a most recent reopening of the anonymous namespace. If its parent
857    // is in a previous PCH (or is the TU), mark that parent for update, because
858    // the original namespace always points to the latest re-opening of its
859    // anonymous namespace.
860    Decl *Parent = cast<Decl>(
861        D->getParent()->getRedeclContext()->getPrimaryContext());
862    if (Parent->isFromASTFile() || isa<TranslationUnitDecl>(Parent)) {
863      ASTWriter::UpdateRecord &Record = Writer.DeclUpdates[Parent];
864      Record.push_back(UPD_CXX_ADDED_ANONYMOUS_NAMESPACE);
865      Writer.AddDeclRef(D, Record);
866    }
867  }
868}
869
870void ASTDeclWriter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
871  VisitNamedDecl(D);
872  Writer.AddSourceLocation(D->getNamespaceLoc(), Record);
873  Writer.AddSourceLocation(D->getTargetNameLoc(), Record);
874  Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
875  Writer.AddDeclRef(D->getNamespace(), Record);
876  Code = serialization::DECL_NAMESPACE_ALIAS;
877}
878
879void ASTDeclWriter::VisitUsingDecl(UsingDecl *D) {
880  VisitNamedDecl(D);
881  Writer.AddSourceLocation(D->getUsingLocation(), Record);
882  Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
883  Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
884  Writer.AddDeclRef(D->FirstUsingShadow.getPointer(), Record);
885  Record.push_back(D->isTypeName());
886  Writer.AddDeclRef(Context.getInstantiatedFromUsingDecl(D), Record);
887  Code = serialization::DECL_USING;
888}
889
890void ASTDeclWriter::VisitUsingShadowDecl(UsingShadowDecl *D) {
891  VisitNamedDecl(D);
892  Writer.AddDeclRef(D->getTargetDecl(), Record);
893  Writer.AddDeclRef(D->UsingOrNextShadow, Record);
894  Writer.AddDeclRef(Context.getInstantiatedFromUsingShadowDecl(D), Record);
895  Code = serialization::DECL_USING_SHADOW;
896}
897
898void ASTDeclWriter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
899  VisitNamedDecl(D);
900  Writer.AddSourceLocation(D->getUsingLoc(), Record);
901  Writer.AddSourceLocation(D->getNamespaceKeyLocation(), Record);
902  Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
903  Writer.AddDeclRef(D->getNominatedNamespace(), Record);
904  Writer.AddDeclRef(dyn_cast<Decl>(D->getCommonAncestor()), Record);
905  Code = serialization::DECL_USING_DIRECTIVE;
906}
907
908void ASTDeclWriter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
909  VisitValueDecl(D);
910  Writer.AddSourceLocation(D->getUsingLoc(), Record);
911  Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
912  Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
913  Code = serialization::DECL_UNRESOLVED_USING_VALUE;
914}
915
916void ASTDeclWriter::VisitUnresolvedUsingTypenameDecl(
917                                               UnresolvedUsingTypenameDecl *D) {
918  VisitTypeDecl(D);
919  Writer.AddSourceLocation(D->getTypenameLoc(), Record);
920  Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
921  Code = serialization::DECL_UNRESOLVED_USING_TYPENAME;
922}
923
924void ASTDeclWriter::VisitCXXRecordDecl(CXXRecordDecl *D) {
925  VisitRecordDecl(D);
926  Record.push_back(D->isThisDeclarationADefinition());
927  if (D->isThisDeclarationADefinition())
928    Writer.AddCXXDefinitionData(D, Record);
929
930  enum {
931    CXXRecNotTemplate = 0, CXXRecTemplate, CXXRecMemberSpecialization
932  };
933  if (ClassTemplateDecl *TemplD = D->getDescribedClassTemplate()) {
934    Record.push_back(CXXRecTemplate);
935    Writer.AddDeclRef(TemplD, Record);
936  } else if (MemberSpecializationInfo *MSInfo
937               = D->getMemberSpecializationInfo()) {
938    Record.push_back(CXXRecMemberSpecialization);
939    Writer.AddDeclRef(MSInfo->getInstantiatedFrom(), Record);
940    Record.push_back(MSInfo->getTemplateSpecializationKind());
941    Writer.AddSourceLocation(MSInfo->getPointOfInstantiation(), Record);
942  } else {
943    Record.push_back(CXXRecNotTemplate);
944  }
945
946  // Store (what we currently believe to be) the key function to avoid
947  // deserializing every method so we can compute it.
948  if (D->IsCompleteDefinition)
949    Writer.AddDeclRef(Context.getCurrentKeyFunction(D), Record);
950
951  Code = serialization::DECL_CXX_RECORD;
952}
953
954void ASTDeclWriter::VisitCXXMethodDecl(CXXMethodDecl *D) {
955  VisitFunctionDecl(D);
956  if (D->isCanonicalDecl()) {
957    Record.push_back(D->size_overridden_methods());
958    for (CXXMethodDecl::method_iterator
959           I = D->begin_overridden_methods(), E = D->end_overridden_methods();
960           I != E; ++I)
961      Writer.AddDeclRef(*I, Record);
962  } else {
963    // We only need to record overridden methods once for the canonical decl.
964    Record.push_back(0);
965  }
966  Code = serialization::DECL_CXX_METHOD;
967}
968
969void ASTDeclWriter::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
970  VisitCXXMethodDecl(D);
971
972  Record.push_back(D->IsExplicitSpecified);
973  Record.push_back(D->ImplicitlyDefined);
974  Writer.AddCXXCtorInitializers(D->CtorInitializers, D->NumCtorInitializers,
975                                Record);
976
977  Code = serialization::DECL_CXX_CONSTRUCTOR;
978}
979
980void ASTDeclWriter::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
981  VisitCXXMethodDecl(D);
982
983  Record.push_back(D->ImplicitlyDefined);
984  Writer.AddDeclRef(D->OperatorDelete, Record);
985
986  Code = serialization::DECL_CXX_DESTRUCTOR;
987}
988
989void ASTDeclWriter::VisitCXXConversionDecl(CXXConversionDecl *D) {
990  VisitCXXMethodDecl(D);
991  Record.push_back(D->IsExplicitSpecified);
992  Code = serialization::DECL_CXX_CONVERSION;
993}
994
995void ASTDeclWriter::VisitImportDecl(ImportDecl *D) {
996  VisitDecl(D);
997  Record.push_back(Writer.getSubmoduleID(D->getImportedModule()));
998  ArrayRef<SourceLocation> IdentifierLocs = D->getIdentifierLocs();
999  Record.push_back(!IdentifierLocs.empty());
1000  if (IdentifierLocs.empty()) {
1001    Writer.AddSourceLocation(D->getLocEnd(), Record);
1002    Record.push_back(1);
1003  } else {
1004    for (unsigned I = 0, N = IdentifierLocs.size(); I != N; ++I)
1005      Writer.AddSourceLocation(IdentifierLocs[I], Record);
1006    Record.push_back(IdentifierLocs.size());
1007  }
1008  // Note: the number of source locations must always be the last element in
1009  // the record.
1010  Code = serialization::DECL_IMPORT;
1011}
1012
1013void ASTDeclWriter::VisitAccessSpecDecl(AccessSpecDecl *D) {
1014  VisitDecl(D);
1015  Writer.AddSourceLocation(D->getColonLoc(), Record);
1016  Code = serialization::DECL_ACCESS_SPEC;
1017}
1018
1019void ASTDeclWriter::VisitFriendDecl(FriendDecl *D) {
1020  VisitDecl(D);
1021  Record.push_back(D->Friend.is<TypeSourceInfo*>());
1022  if (D->Friend.is<TypeSourceInfo*>())
1023    Writer.AddTypeSourceInfo(D->Friend.get<TypeSourceInfo*>(), Record);
1024  else
1025    Writer.AddDeclRef(D->Friend.get<NamedDecl*>(), Record);
1026  Writer.AddDeclRef(D->getNextFriend(), Record);
1027  Record.push_back(D->UnsupportedFriend);
1028  Writer.AddSourceLocation(D->FriendLoc, Record);
1029  Code = serialization::DECL_FRIEND;
1030}
1031
1032void ASTDeclWriter::VisitFriendTemplateDecl(FriendTemplateDecl *D) {
1033  VisitDecl(D);
1034  Record.push_back(D->getNumTemplateParameters());
1035  for (unsigned i = 0, e = D->getNumTemplateParameters(); i != e; ++i)
1036    Writer.AddTemplateParameterList(D->getTemplateParameterList(i), Record);
1037  Record.push_back(D->getFriendDecl() != 0);
1038  if (D->getFriendDecl())
1039    Writer.AddDeclRef(D->getFriendDecl(), Record);
1040  else
1041    Writer.AddTypeSourceInfo(D->getFriendType(), Record);
1042  Writer.AddSourceLocation(D->getFriendLoc(), Record);
1043  Code = serialization::DECL_FRIEND_TEMPLATE;
1044}
1045
1046void ASTDeclWriter::VisitTemplateDecl(TemplateDecl *D) {
1047  VisitNamedDecl(D);
1048
1049  Writer.AddDeclRef(D->getTemplatedDecl(), Record);
1050  Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1051}
1052
1053void ASTDeclWriter::VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D) {
1054  VisitRedeclarable(D);
1055
1056  // Emit data to initialize CommonOrPrev before VisitTemplateDecl so that
1057  // getCommonPtr() can be used while this is still initializing.
1058  if (D->isFirstDeclaration()) {
1059    // This declaration owns the 'common' pointer, so serialize that data now.
1060    Writer.AddDeclRef(D->getInstantiatedFromMemberTemplate(), Record);
1061    if (D->getInstantiatedFromMemberTemplate())
1062      Record.push_back(D->isMemberSpecialization());
1063  }
1064
1065  VisitTemplateDecl(D);
1066  Record.push_back(D->getIdentifierNamespace());
1067}
1068
1069void ASTDeclWriter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1070  VisitRedeclarableTemplateDecl(D);
1071
1072  if (D->isFirstDeclaration()) {
1073    typedef llvm::FoldingSetVector<ClassTemplateSpecializationDecl> CTSDSetTy;
1074    CTSDSetTy &CTSDSet = D->getSpecializations();
1075    Record.push_back(CTSDSet.size());
1076    for (CTSDSetTy::iterator I=CTSDSet.begin(), E = CTSDSet.end(); I!=E; ++I) {
1077      assert(I->isCanonicalDecl() && "Expected only canonical decls in set");
1078      Writer.AddDeclRef(&*I, Record);
1079    }
1080
1081    typedef llvm::FoldingSetVector<ClassTemplatePartialSpecializationDecl>
1082      CTPSDSetTy;
1083    CTPSDSetTy &CTPSDSet = D->getPartialSpecializations();
1084    Record.push_back(CTPSDSet.size());
1085    for (CTPSDSetTy::iterator I=CTPSDSet.begin(), E=CTPSDSet.end(); I!=E; ++I) {
1086      assert(I->isCanonicalDecl() && "Expected only canonical decls in set");
1087      Writer.AddDeclRef(&*I, Record);
1088    }
1089
1090    Writer.AddTypeRef(D->getCommonPtr()->InjectedClassNameType, Record);
1091  }
1092  Code = serialization::DECL_CLASS_TEMPLATE;
1093}
1094
1095void ASTDeclWriter::VisitClassTemplateSpecializationDecl(
1096                                           ClassTemplateSpecializationDecl *D) {
1097  VisitCXXRecordDecl(D);
1098
1099  llvm::PointerUnion<ClassTemplateDecl *,
1100                     ClassTemplatePartialSpecializationDecl *> InstFrom
1101    = D->getSpecializedTemplateOrPartial();
1102  if (Decl *InstFromD = InstFrom.dyn_cast<ClassTemplateDecl *>()) {
1103    Writer.AddDeclRef(InstFromD, Record);
1104  } else {
1105    Writer.AddDeclRef(InstFrom.get<ClassTemplatePartialSpecializationDecl *>(),
1106                      Record);
1107    Writer.AddTemplateArgumentList(&D->getTemplateInstantiationArgs(), Record);
1108  }
1109
1110  // Explicit info.
1111  Writer.AddTypeSourceInfo(D->getTypeAsWritten(), Record);
1112  if (D->getTypeAsWritten()) {
1113    Writer.AddSourceLocation(D->getExternLoc(), Record);
1114    Writer.AddSourceLocation(D->getTemplateKeywordLoc(), Record);
1115  }
1116
1117  Writer.AddTemplateArgumentList(&D->getTemplateArgs(), Record);
1118  Writer.AddSourceLocation(D->getPointOfInstantiation(), Record);
1119  Record.push_back(D->getSpecializationKind());
1120  Record.push_back(D->isCanonicalDecl());
1121
1122  if (D->isCanonicalDecl()) {
1123    // When reading, we'll add it to the folding set of the following template.
1124    Writer.AddDeclRef(D->getSpecializedTemplate()->getCanonicalDecl(), Record);
1125  }
1126
1127  Code = serialization::DECL_CLASS_TEMPLATE_SPECIALIZATION;
1128}
1129
1130void ASTDeclWriter::VisitClassTemplatePartialSpecializationDecl(
1131                                    ClassTemplatePartialSpecializationDecl *D) {
1132  VisitClassTemplateSpecializationDecl(D);
1133
1134  Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1135
1136  Record.push_back(D->getNumTemplateArgsAsWritten());
1137  for (int i = 0, e = D->getNumTemplateArgsAsWritten(); i != e; ++i)
1138    Writer.AddTemplateArgumentLoc(D->getTemplateArgsAsWritten()[i], Record);
1139
1140  Record.push_back(D->getSequenceNumber());
1141
1142  // These are read/set from/to the first declaration.
1143  if (D->getPreviousDecl() == 0) {
1144    Writer.AddDeclRef(D->getInstantiatedFromMember(), Record);
1145    Record.push_back(D->isMemberSpecialization());
1146  }
1147
1148  Code = serialization::DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION;
1149}
1150
1151void ASTDeclWriter::VisitClassScopeFunctionSpecializationDecl(
1152                                    ClassScopeFunctionSpecializationDecl *D) {
1153  VisitDecl(D);
1154  Writer.AddDeclRef(D->getSpecialization(), Record);
1155  Code = serialization::DECL_CLASS_SCOPE_FUNCTION_SPECIALIZATION;
1156}
1157
1158
1159void ASTDeclWriter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1160  VisitRedeclarableTemplateDecl(D);
1161
1162  if (D->isFirstDeclaration()) {
1163    // This FunctionTemplateDecl owns the CommonPtr; write it.
1164
1165    // Write the function specialization declarations.
1166    Record.push_back(D->getSpecializations().size());
1167    for (llvm::FoldingSetVector<FunctionTemplateSpecializationInfo>::iterator
1168           I = D->getSpecializations().begin(),
1169           E = D->getSpecializations().end()   ; I != E; ++I) {
1170      assert(I->Function->isCanonicalDecl() &&
1171             "Expected only canonical decls in set");
1172      Writer.AddDeclRef(I->Function, Record);
1173    }
1174  }
1175  Code = serialization::DECL_FUNCTION_TEMPLATE;
1176}
1177
1178void ASTDeclWriter::VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D) {
1179  VisitTypeDecl(D);
1180
1181  Record.push_back(D->wasDeclaredWithTypename());
1182  Record.push_back(D->defaultArgumentWasInherited());
1183  Writer.AddTypeSourceInfo(D->getDefaultArgumentInfo(), Record);
1184
1185  Code = serialization::DECL_TEMPLATE_TYPE_PARM;
1186}
1187
1188void ASTDeclWriter::VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {
1189  // For an expanded parameter pack, record the number of expansion types here
1190  // so that it's easier for deserialization to allocate the right amount of
1191  // memory.
1192  if (D->isExpandedParameterPack())
1193    Record.push_back(D->getNumExpansionTypes());
1194
1195  VisitDeclaratorDecl(D);
1196  // TemplateParmPosition.
1197  Record.push_back(D->getDepth());
1198  Record.push_back(D->getPosition());
1199
1200  if (D->isExpandedParameterPack()) {
1201    for (unsigned I = 0, N = D->getNumExpansionTypes(); I != N; ++I) {
1202      Writer.AddTypeRef(D->getExpansionType(I), Record);
1203      Writer.AddTypeSourceInfo(D->getExpansionTypeSourceInfo(I), Record);
1204    }
1205
1206    Code = serialization::DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK;
1207  } else {
1208    // Rest of NonTypeTemplateParmDecl.
1209    Record.push_back(D->isParameterPack());
1210    Record.push_back(D->getDefaultArgument() != 0);
1211    if (D->getDefaultArgument()) {
1212      Writer.AddStmt(D->getDefaultArgument());
1213      Record.push_back(D->defaultArgumentWasInherited());
1214    }
1215    Code = serialization::DECL_NON_TYPE_TEMPLATE_PARM;
1216  }
1217}
1218
1219void ASTDeclWriter::VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D) {
1220  // For an expanded parameter pack, record the number of expansion types here
1221  // so that it's easier for deserialization to allocate the right amount of
1222  // memory.
1223  if (D->isExpandedParameterPack())
1224    Record.push_back(D->getNumExpansionTemplateParameters());
1225
1226  VisitTemplateDecl(D);
1227  // TemplateParmPosition.
1228  Record.push_back(D->getDepth());
1229  Record.push_back(D->getPosition());
1230
1231  if (D->isExpandedParameterPack()) {
1232    for (unsigned I = 0, N = D->getNumExpansionTemplateParameters();
1233         I != N; ++I)
1234      Writer.AddTemplateParameterList(D->getExpansionTemplateParameters(I),
1235                                      Record);
1236    Code = serialization::DECL_EXPANDED_TEMPLATE_TEMPLATE_PARM_PACK;
1237  } else {
1238    // Rest of TemplateTemplateParmDecl.
1239    Writer.AddTemplateArgumentLoc(D->getDefaultArgument(), Record);
1240    Record.push_back(D->defaultArgumentWasInherited());
1241    Record.push_back(D->isParameterPack());
1242    Code = serialization::DECL_TEMPLATE_TEMPLATE_PARM;
1243  }
1244}
1245
1246void ASTDeclWriter::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) {
1247  VisitRedeclarableTemplateDecl(D);
1248  Code = serialization::DECL_TYPE_ALIAS_TEMPLATE;
1249}
1250
1251void ASTDeclWriter::VisitStaticAssertDecl(StaticAssertDecl *D) {
1252  VisitDecl(D);
1253  Writer.AddStmt(D->getAssertExpr());
1254  Record.push_back(D->isFailed());
1255  Writer.AddStmt(D->getMessage());
1256  Writer.AddSourceLocation(D->getRParenLoc(), Record);
1257  Code = serialization::DECL_STATIC_ASSERT;
1258}
1259
1260/// \brief Emit the DeclContext part of a declaration context decl.
1261///
1262/// \param LexicalOffset the offset at which the DECL_CONTEXT_LEXICAL
1263/// block for this declaration context is stored. May be 0 to indicate
1264/// that there are no declarations stored within this context.
1265///
1266/// \param VisibleOffset the offset at which the DECL_CONTEXT_VISIBLE
1267/// block for this declaration context is stored. May be 0 to indicate
1268/// that there are no declarations visible from this context. Note
1269/// that this value will not be emitted for non-primary declaration
1270/// contexts.
1271void ASTDeclWriter::VisitDeclContext(DeclContext *DC, uint64_t LexicalOffset,
1272                                     uint64_t VisibleOffset) {
1273  Record.push_back(LexicalOffset);
1274  Record.push_back(VisibleOffset);
1275}
1276
1277template <typename T>
1278void ASTDeclWriter::VisitRedeclarable(Redeclarable<T> *D) {
1279  T *First = D->getFirstDeclaration();
1280  if (First->getMostRecentDecl() != First) {
1281    assert(isRedeclarableDeclKind(static_cast<T *>(D)->getKind()) &&
1282           "Not considered redeclarable?");
1283
1284    // There is more than one declaration of this entity, so we will need to
1285    // write a redeclaration chain.
1286    Writer.AddDeclRef(First, Record);
1287    Writer.Redeclarations.insert(First);
1288
1289    // Make sure that we serialize both the previous and the most-recent
1290    // declarations, which (transitively) ensures that all declarations in the
1291    // chain get serialized.
1292    (void)Writer.GetDeclRef(D->getPreviousDecl());
1293    (void)Writer.GetDeclRef(First->getMostRecentDecl());
1294  } else {
1295    // We use the sentinel value 0 to indicate an only declaration.
1296    Record.push_back(0);
1297  }
1298
1299}
1300
1301//===----------------------------------------------------------------------===//
1302// ASTWriter Implementation
1303//===----------------------------------------------------------------------===//
1304
1305void ASTWriter::WriteDeclsBlockAbbrevs() {
1306  using namespace llvm;
1307
1308  BitCodeAbbrev *Abv;
1309
1310  // Abbreviation for DECL_FIELD
1311  Abv = new BitCodeAbbrev();
1312  Abv->Add(BitCodeAbbrevOp(serialization::DECL_FIELD));
1313  // Decl
1314  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1315  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1316  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1317  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1318  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1319  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1320  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1321  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1322  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1323  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1324  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1325  // NamedDecl
1326  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1327  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1328  // ValueDecl
1329  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1330  // DeclaratorDecl
1331  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1332  Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1333  // FieldDecl
1334  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1335  Abv->Add(BitCodeAbbrevOp(0));                       //getBitWidth
1336  // Type Source Info
1337  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1338  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1339  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1340  DeclFieldAbbrev = Stream.EmitAbbrev(Abv);
1341
1342  // Abbreviation for DECL_OBJC_IVAR
1343  Abv = new BitCodeAbbrev();
1344  Abv->Add(BitCodeAbbrevOp(serialization::DECL_OBJC_IVAR));
1345  // Decl
1346  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1347  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1348  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1349  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1350  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1351  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1352  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1353  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1354  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1355  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1356  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1357  // NamedDecl
1358  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1359  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1360  // ValueDecl
1361  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1362  // DeclaratorDecl
1363  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1364  Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1365  // FieldDecl
1366  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1367  Abv->Add(BitCodeAbbrevOp(0));                       //getBitWidth
1368  // ObjC Ivar
1369  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getAccessControl
1370  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getSynthesize
1371  // Type Source Info
1372  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1373  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1374  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1375  DeclObjCIvarAbbrev = Stream.EmitAbbrev(Abv);
1376
1377  // Abbreviation for DECL_ENUM
1378  Abv = new BitCodeAbbrev();
1379  Abv->Add(BitCodeAbbrevOp(serialization::DECL_ENUM));
1380  // Redeclarable
1381  Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1382  // Decl
1383  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1384  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1385  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1386  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1387  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1388  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1389  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1390  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1391  Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1392  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1393  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1394  // NamedDecl
1395  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1396  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1397  // TypeDecl
1398  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1399  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1400  // TagDecl
1401  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1402  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1403  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1404  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1405  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1406  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1407  Abv->Add(BitCodeAbbrevOp(0));                         // hasExtInfo
1408  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // TypedefNameAnonDecl
1409  // EnumDecl
1410  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // AddTypeRef
1411  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IntegerType
1412  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getPromotionType
1413  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumPositiveBits
1414  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumNegativeBits
1415  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScoped
1416  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScopedUsingClassTag
1417  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isFixed
1418  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // InstantiatedMembEnum
1419  // DC
1420  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1421  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1422  DeclEnumAbbrev = Stream.EmitAbbrev(Abv);
1423
1424  // Abbreviation for DECL_RECORD
1425  Abv = new BitCodeAbbrev();
1426  Abv->Add(BitCodeAbbrevOp(serialization::DECL_RECORD));
1427  // Redeclarable
1428  Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1429  // Decl
1430  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1431  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1432  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1433  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1434  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1435  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1436  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1437  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1438  Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1439  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1440  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1441  // NamedDecl
1442  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1443  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1444  // TypeDecl
1445  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1446  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1447  // TagDecl
1448  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1449  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1450  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1451  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1452  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1453  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1454  Abv->Add(BitCodeAbbrevOp(0));                         // hasExtInfo
1455  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // TypedefNameAnonDecl
1456  // RecordDecl
1457  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // FlexibleArrayMember
1458  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // AnonymousStructUnion
1459  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasObjectMember
1460  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasVolatileMember
1461  // DC
1462  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1463  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1464  DeclRecordAbbrev = Stream.EmitAbbrev(Abv);
1465
1466  // Abbreviation for DECL_PARM_VAR
1467  Abv = new BitCodeAbbrev();
1468  Abv->Add(BitCodeAbbrevOp(serialization::DECL_PARM_VAR));
1469  // Redeclarable
1470  Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1471  // Decl
1472  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1473  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1474  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1475  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1476  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1477  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1478  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1479  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1480  Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1481  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1482  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1483  // NamedDecl
1484  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1485  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1486  // ValueDecl
1487  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1488  // DeclaratorDecl
1489  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1490  Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1491  // VarDecl
1492  Abv->Add(BitCodeAbbrevOp(0));                       // StorageClass
1493  Abv->Add(BitCodeAbbrevOp(0));                       // StorageClassAsWritten
1494  Abv->Add(BitCodeAbbrevOp(0));                       // isThreadSpecified
1495  Abv->Add(BitCodeAbbrevOp(0));                       // hasCXXDirectInitializer
1496  Abv->Add(BitCodeAbbrevOp(0));                       // isExceptionVariable
1497  Abv->Add(BitCodeAbbrevOp(0));                       // isNRVOVariable
1498  Abv->Add(BitCodeAbbrevOp(0));                       // isCXXForRangeDecl
1499  Abv->Add(BitCodeAbbrevOp(0));                       // isARCPseudoStrong
1500  Abv->Add(BitCodeAbbrevOp(0));                       // isConstexpr
1501  Abv->Add(BitCodeAbbrevOp(0));                       // HasInit
1502  Abv->Add(BitCodeAbbrevOp(0));                   // HasMemberSpecializationInfo
1503  // ParmVarDecl
1504  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsObjCMethodParameter
1505  Abv->Add(BitCodeAbbrevOp(0));                       // ScopeDepth
1506  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ScopeIndex
1507  Abv->Add(BitCodeAbbrevOp(0));                       // ObjCDeclQualifier
1508  Abv->Add(BitCodeAbbrevOp(0));                       // KNRPromoted
1509  Abv->Add(BitCodeAbbrevOp(0));                       // HasInheritedDefaultArg
1510  Abv->Add(BitCodeAbbrevOp(0));                   // HasUninstantiatedDefaultArg
1511  // Type Source Info
1512  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1513  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1514  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1515  DeclParmVarAbbrev = Stream.EmitAbbrev(Abv);
1516
1517  // Abbreviation for DECL_TYPEDEF
1518  Abv = new BitCodeAbbrev();
1519  Abv->Add(BitCodeAbbrevOp(serialization::DECL_TYPEDEF));
1520  // Redeclarable
1521  Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1522  // Decl
1523  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1524  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1525  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1526  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1527  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1528  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1529  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1530  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1531  Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1532  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1533  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1534  // NamedDecl
1535  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1536  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1537  // TypeDecl
1538  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1539  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1540  // TypedefDecl
1541  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1542  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1543  DeclTypedefAbbrev = Stream.EmitAbbrev(Abv);
1544
1545  // Abbreviation for DECL_VAR
1546  Abv = new BitCodeAbbrev();
1547  Abv->Add(BitCodeAbbrevOp(serialization::DECL_VAR));
1548  // Redeclarable
1549  Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1550  // Decl
1551  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1552  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1553  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1554  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1555  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1556  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1557  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1558  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1559  Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1560  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1561  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1562  // NamedDecl
1563  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1564  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1565  // ValueDecl
1566  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1567  // DeclaratorDecl
1568  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1569  Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1570  // VarDecl
1571  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // StorageClass
1572  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // StorageClassAsWritten
1573  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isThreadSpecified
1574  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // CXXDirectInitializer
1575  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isExceptionVariable
1576  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isNRVOVariable
1577  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCXXForRangeDecl
1578  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isARCPseudoStrong
1579  Abv->Add(BitCodeAbbrevOp(0));                         // isConstexpr
1580  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // HasInit
1581  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // HasMemberSpecInfo
1582  // Type Source Info
1583  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1584  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1585  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1586  DeclVarAbbrev = Stream.EmitAbbrev(Abv);
1587
1588  // Abbreviation for EXPR_DECL_REF
1589  Abv = new BitCodeAbbrev();
1590  Abv->Add(BitCodeAbbrevOp(serialization::EXPR_DECL_REF));
1591  //Stmt
1592  //Expr
1593  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1594  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
1595  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
1596  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
1597  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
1598  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
1599  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
1600  //DeclRefExpr
1601  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HasQualifier
1602  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //GetDeclFound
1603  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ExplicitTemplateArgs
1604  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HadMultipleCandidates
1605  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //RefersToEnclosingLocal
1606  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclRef
1607  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1608  DeclRefExprAbbrev = Stream.EmitAbbrev(Abv);
1609
1610  // Abbreviation for EXPR_INTEGER_LITERAL
1611  Abv = new BitCodeAbbrev();
1612  Abv->Add(BitCodeAbbrevOp(serialization::EXPR_INTEGER_LITERAL));
1613  //Stmt
1614  //Expr
1615  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1616  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
1617  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
1618  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
1619  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
1620  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
1621  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
1622  //Integer Literal
1623  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1624  Abv->Add(BitCodeAbbrevOp(32));                      // Bit Width
1625  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Value
1626  IntegerLiteralAbbrev = Stream.EmitAbbrev(Abv);
1627
1628  // Abbreviation for EXPR_CHARACTER_LITERAL
1629  Abv = new BitCodeAbbrev();
1630  Abv->Add(BitCodeAbbrevOp(serialization::EXPR_CHARACTER_LITERAL));
1631  //Stmt
1632  //Expr
1633  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1634  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
1635  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
1636  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
1637  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
1638  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
1639  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
1640  //Character Literal
1641  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getValue
1642  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1643  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // getKind
1644  CharacterLiteralAbbrev = Stream.EmitAbbrev(Abv);
1645
1646  Abv = new BitCodeAbbrev();
1647  Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_LEXICAL));
1648  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1649  DeclContextLexicalAbbrev = Stream.EmitAbbrev(Abv);
1650
1651  Abv = new BitCodeAbbrev();
1652  Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_VISIBLE));
1653  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1654  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1655  DeclContextVisibleLookupAbbrev = Stream.EmitAbbrev(Abv);
1656}
1657
1658/// isRequiredDecl - Check if this is a "required" Decl, which must be seen by
1659/// consumers of the AST.
1660///
1661/// Such decls will always be deserialized from the AST file, so we would like
1662/// this to be as restrictive as possible. Currently the predicate is driven by
1663/// code generation requirements, if other clients have a different notion of
1664/// what is "required" then we may have to consider an alternate scheme where
1665/// clients can iterate over the top-level decls and get information on them,
1666/// without necessary deserializing them. We could explicitly require such
1667/// clients to use a separate API call to "realize" the decl. This should be
1668/// relatively painless since they would presumably only do it for top-level
1669/// decls.
1670static bool isRequiredDecl(const Decl *D, ASTContext &Context) {
1671  // An ObjCMethodDecl is never considered as "required" because its
1672  // implementation container always is.
1673
1674  // File scoped assembly or obj-c implementation must be seen.
1675  if (isa<FileScopeAsmDecl>(D) || isa<ObjCImplDecl>(D))
1676    return true;
1677
1678  return Context.DeclMustBeEmitted(D);
1679}
1680
1681void ASTWriter::WriteDecl(ASTContext &Context, Decl *D) {
1682  // Switch case IDs are per Decl.
1683  ClearSwitchCaseIDs();
1684
1685  RecordData Record;
1686  ASTDeclWriter W(*this, Context, Record);
1687
1688  // Determine the ID for this declaration.
1689  serialization::DeclID ID;
1690  if (D->isFromASTFile())
1691    ID = getDeclID(D);
1692  else {
1693    serialization::DeclID &IDR = DeclIDs[D];
1694    if (IDR == 0)
1695      IDR = NextDeclID++;
1696
1697    ID= IDR;
1698  }
1699
1700  bool isReplacingADecl = ID < FirstDeclID;
1701
1702  // If this declaration is also a DeclContext, write blocks for the
1703  // declarations that lexically stored inside its context and those
1704  // declarations that are visible from its context. These blocks
1705  // are written before the declaration itself so that we can put
1706  // their offsets into the record for the declaration.
1707  uint64_t LexicalOffset = 0;
1708  uint64_t VisibleOffset = 0;
1709  DeclContext *DC = dyn_cast<DeclContext>(D);
1710  if (DC) {
1711    if (isReplacingADecl) {
1712      // It is replacing a decl from a chained PCH; make sure that the
1713      // DeclContext is fully loaded.
1714      if (DC->hasExternalLexicalStorage())
1715        DC->LoadLexicalDeclsFromExternalStorage();
1716      if (DC->hasExternalVisibleStorage())
1717        Chain->completeVisibleDeclsMap(DC);
1718    }
1719    LexicalOffset = WriteDeclContextLexicalBlock(Context, DC);
1720    VisibleOffset = WriteDeclContextVisibleBlock(Context, DC);
1721  }
1722
1723  if (isReplacingADecl) {
1724    // We're replacing a decl in a previous file.
1725    ReplacedDecls.push_back(ReplacedDeclInfo(ID, Stream.GetCurrentBitNo(),
1726                                             D->getLocation()));
1727  } else {
1728    unsigned Index = ID - FirstDeclID;
1729
1730    // Record the offset for this declaration
1731    SourceLocation Loc = D->getLocation();
1732    if (DeclOffsets.size() == Index)
1733      DeclOffsets.push_back(DeclOffset(Loc, Stream.GetCurrentBitNo()));
1734    else if (DeclOffsets.size() < Index) {
1735      DeclOffsets.resize(Index+1);
1736      DeclOffsets[Index].setLocation(Loc);
1737      DeclOffsets[Index].BitOffset = Stream.GetCurrentBitNo();
1738    }
1739
1740    SourceManager &SM = Context.getSourceManager();
1741    if (Loc.isValid() && SM.isLocalSourceLocation(Loc))
1742      associateDeclWithFile(D, ID);
1743  }
1744
1745  // Build and emit a record for this declaration
1746  Record.clear();
1747  W.Code = (serialization::DeclCode)0;
1748  W.AbbrevToUse = 0;
1749  W.Visit(D);
1750  if (DC) W.VisitDeclContext(DC, LexicalOffset, VisibleOffset);
1751
1752  if (!W.Code)
1753    llvm::report_fatal_error(StringRef("unexpected declaration kind '") +
1754                            D->getDeclKindName() + "'");
1755  Stream.EmitRecord(W.Code, Record, W.AbbrevToUse);
1756
1757  // Flush any expressions that were written as part of this declaration.
1758  FlushStmts();
1759
1760  // Flush C++ base specifiers, if there are any.
1761  FlushCXXBaseSpecifiers();
1762
1763  // Note "external" declarations so that we can add them to a record in the
1764  // AST file later.
1765  //
1766  // FIXME: This should be renamed, the predicate is much more complicated.
1767  if (isRequiredDecl(D, Context))
1768    ExternalDefinitions.push_back(ID);
1769}
1770