ASTWriterDecl.cpp revision 243830 
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 "clang/Serialization/ASTReader.h"
16#include "ASTCommon.h"
17#include "clang/AST/DeclVisitor.h"
18#include "clang/AST/DeclCXX.h"
19#include "clang/AST/DeclTemplate.h"
20#include "clang/AST/Expr.h"
21#include "clang/AST/DeclContextInternals.h"
22#include "clang/Basic/SourceManager.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
267  if (!D->hasAttrs() &&
268      !D->isImplicit() &&
269      !D->isUsed(false) &&
270      !D->hasExtInfo() &&
271      D->getFirstDeclaration() == D->getMostRecentDecl() &&
272      !D->isInvalidDecl() &&
273      !D->isReferenced() &&
274      !D->isTopLevelDeclInObjCContainer() &&
275      D->getAccess() == AS_none &&
276      !D->isModulePrivate() &&
277      !CXXRecordDecl::classofKind(D->getKind()) &&
278      D->getDeclName().getNameKind() == DeclarationName::Identifier)
279    AbbrevToUse = Writer.getDeclRecordAbbrev();
280
281  Code = serialization::DECL_RECORD;
282}
283
284void ASTDeclWriter::VisitValueDecl(ValueDecl *D) {
285  VisitNamedDecl(D);
286  Writer.AddTypeRef(D->getType(), Record);
287}
288
289void ASTDeclWriter::VisitEnumConstantDecl(EnumConstantDecl *D) {
290  VisitValueDecl(D);
291  Record.push_back(D->getInitExpr()? 1 : 0);
292  if (D->getInitExpr())
293    Writer.AddStmt(D->getInitExpr());
294  Writer.AddAPSInt(D->getInitVal(), Record);
295
296  Code = serialization::DECL_ENUM_CONSTANT;
297}
298
299void ASTDeclWriter::VisitDeclaratorDecl(DeclaratorDecl *D) {
300  VisitValueDecl(D);
301  Writer.AddSourceLocation(D->getInnerLocStart(), Record);
302  Record.push_back(D->hasExtInfo());
303  if (D->hasExtInfo())
304    Writer.AddQualifierInfo(*D->getExtInfo(), Record);
305}
306
307void ASTDeclWriter::VisitFunctionDecl(FunctionDecl *D) {
308  VisitRedeclarable(D);
309  VisitDeclaratorDecl(D);
310
311  Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
312  Record.push_back(D->getIdentifierNamespace());
313
314  // FunctionDecl's body is handled last at ASTWriterDecl::Visit,
315  // after everything else is written.
316
317  Record.push_back(D->getStorageClass()); // FIXME: stable encoding
318  Record.push_back(D->getStorageClassAsWritten());
319  Record.push_back(D->IsInline);
320  Record.push_back(D->isInlineSpecified());
321  Record.push_back(D->isVirtualAsWritten());
322  Record.push_back(D->isPure());
323  Record.push_back(D->hasInheritedPrototype());
324  Record.push_back(D->hasWrittenPrototype());
325  Record.push_back(D->isDeletedAsWritten());
326  Record.push_back(D->isTrivial());
327  Record.push_back(D->isDefaulted());
328  Record.push_back(D->isExplicitlyDefaulted());
329  Record.push_back(D->hasImplicitReturnZero());
330  Record.push_back(D->isConstexpr());
331  Writer.AddSourceLocation(D->getLocEnd(), Record);
332
333  Record.push_back(D->getTemplatedKind());
334  switch (D->getTemplatedKind()) {
335  case FunctionDecl::TK_NonTemplate:
336    break;
337  case FunctionDecl::TK_FunctionTemplate:
338    Writer.AddDeclRef(D->getDescribedFunctionTemplate(), Record);
339    break;
340  case FunctionDecl::TK_MemberSpecialization: {
341    MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo();
342    Writer.AddDeclRef(MemberInfo->getInstantiatedFrom(), Record);
343    Record.push_back(MemberInfo->getTemplateSpecializationKind());
344    Writer.AddSourceLocation(MemberInfo->getPointOfInstantiation(), Record);
345    break;
346  }
347  case FunctionDecl::TK_FunctionTemplateSpecialization: {
348    FunctionTemplateSpecializationInfo *
349      FTSInfo = D->getTemplateSpecializationInfo();
350    Writer.AddDeclRef(FTSInfo->getTemplate(), Record);
351    Record.push_back(FTSInfo->getTemplateSpecializationKind());
352
353    // Template arguments.
354    Writer.AddTemplateArgumentList(FTSInfo->TemplateArguments, Record);
355
356    // Template args as written.
357    Record.push_back(FTSInfo->TemplateArgumentsAsWritten != 0);
358    if (FTSInfo->TemplateArgumentsAsWritten) {
359      Record.push_back(FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs);
360      for (int i=0, e = FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs;
361             i!=e; ++i)
362        Writer.AddTemplateArgumentLoc((*FTSInfo->TemplateArgumentsAsWritten)[i],
363                                      Record);
364      Writer.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->LAngleLoc,
365                               Record);
366      Writer.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->RAngleLoc,
367                               Record);
368    }
369
370    Writer.AddSourceLocation(FTSInfo->getPointOfInstantiation(), Record);
371
372    if (D->isCanonicalDecl()) {
373      // Write the template that contains the specializations set. We will
374      // add a FunctionTemplateSpecializationInfo to it when reading.
375      Writer.AddDeclRef(FTSInfo->getTemplate()->getCanonicalDecl(), Record);
376    }
377    break;
378  }
379  case FunctionDecl::TK_DependentFunctionTemplateSpecialization: {
380    DependentFunctionTemplateSpecializationInfo *
381      DFTSInfo = D->getDependentSpecializationInfo();
382
383    // Templates.
384    Record.push_back(DFTSInfo->getNumTemplates());
385    for (int i=0, e = DFTSInfo->getNumTemplates(); i != e; ++i)
386      Writer.AddDeclRef(DFTSInfo->getTemplate(i), Record);
387
388    // Templates args.
389    Record.push_back(DFTSInfo->getNumTemplateArgs());
390    for (int i=0, e = DFTSInfo->getNumTemplateArgs(); i != e; ++i)
391      Writer.AddTemplateArgumentLoc(DFTSInfo->getTemplateArg(i), Record);
392    Writer.AddSourceLocation(DFTSInfo->getLAngleLoc(), Record);
393    Writer.AddSourceLocation(DFTSInfo->getRAngleLoc(), Record);
394    break;
395  }
396  }
397
398  Record.push_back(D->param_size());
399  for (FunctionDecl::param_iterator P = D->param_begin(), PEnd = D->param_end();
400       P != PEnd; ++P)
401    Writer.AddDeclRef(*P, Record);
402  Code = serialization::DECL_FUNCTION;
403}
404
405void ASTDeclWriter::VisitObjCMethodDecl(ObjCMethodDecl *D) {
406  VisitNamedDecl(D);
407  // FIXME: convert to LazyStmtPtr?
408  // Unlike C/C++, method bodies will never be in header files.
409  bool HasBodyStuff = D->getBody() != 0     ||
410                      D->getSelfDecl() != 0 || D->getCmdDecl() != 0;
411  Record.push_back(HasBodyStuff);
412  if (HasBodyStuff) {
413    Writer.AddStmt(D->getBody());
414    Writer.AddDeclRef(D->getSelfDecl(), Record);
415    Writer.AddDeclRef(D->getCmdDecl(), Record);
416  }
417  Record.push_back(D->isInstanceMethod());
418  Record.push_back(D->isVariadic());
419  Record.push_back(D->isPropertyAccessor());
420  Record.push_back(D->isDefined());
421  Record.push_back(D->IsOverriding);
422
423  Record.push_back(D->IsRedeclaration);
424  Record.push_back(D->HasRedeclaration);
425  if (D->HasRedeclaration) {
426    assert(Context.getObjCMethodRedeclaration(D));
427    Writer.AddDeclRef(Context.getObjCMethodRedeclaration(D), Record);
428  }
429
430  // FIXME: stable encoding for @required/@optional
431  Record.push_back(D->getImplementationControl());
432  // FIXME: stable encoding for in/out/inout/bycopy/byref/oneway
433  Record.push_back(D->getObjCDeclQualifier());
434  Record.push_back(D->hasRelatedResultType());
435  Writer.AddTypeRef(D->getResultType(), Record);
436  Writer.AddTypeSourceInfo(D->getResultTypeSourceInfo(), Record);
437  Writer.AddSourceLocation(D->getLocEnd(), Record);
438  Record.push_back(D->param_size());
439  for (ObjCMethodDecl::param_iterator P = D->param_begin(),
440                                   PEnd = D->param_end(); P != PEnd; ++P)
441    Writer.AddDeclRef(*P, Record);
442
443  Record.push_back(D->SelLocsKind);
444  unsigned NumStoredSelLocs = D->getNumStoredSelLocs();
445  SourceLocation *SelLocs = D->getStoredSelLocs();
446  Record.push_back(NumStoredSelLocs);
447  for (unsigned i = 0; i != NumStoredSelLocs; ++i)
448    Writer.AddSourceLocation(SelLocs[i], Record);
449
450  Code = serialization::DECL_OBJC_METHOD;
451}
452
453void ASTDeclWriter::VisitObjCContainerDecl(ObjCContainerDecl *D) {
454  VisitNamedDecl(D);
455  Writer.AddSourceLocation(D->getAtStartLoc(), Record);
456  Writer.AddSourceRange(D->getAtEndRange(), Record);
457  // Abstract class (no need to define a stable serialization::DECL code).
458}
459
460void ASTDeclWriter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *D) {
461  VisitRedeclarable(D);
462  VisitObjCContainerDecl(D);
463  Writer.AddTypeRef(QualType(D->getTypeForDecl(), 0), Record);
464
465  Record.push_back(D->isThisDeclarationADefinition());
466  if (D->isThisDeclarationADefinition()) {
467    // Write the DefinitionData
468    ObjCInterfaceDecl::DefinitionData &Data = D->data();
469
470    Writer.AddDeclRef(D->getSuperClass(), Record);
471    Writer.AddSourceLocation(D->getSuperClassLoc(), Record);
472    Writer.AddSourceLocation(D->getEndOfDefinitionLoc(), Record);
473
474    // Write out the protocols that are directly referenced by the @interface.
475    Record.push_back(Data.ReferencedProtocols.size());
476    for (ObjCInterfaceDecl::protocol_iterator P = D->protocol_begin(),
477                                           PEnd = D->protocol_end();
478         P != PEnd; ++P)
479      Writer.AddDeclRef(*P, Record);
480    for (ObjCInterfaceDecl::protocol_loc_iterator PL = D->protocol_loc_begin(),
481         PLEnd = D->protocol_loc_end();
482         PL != PLEnd; ++PL)
483      Writer.AddSourceLocation(*PL, Record);
484
485    // Write out the protocols that are transitively referenced.
486    Record.push_back(Data.AllReferencedProtocols.size());
487    for (ObjCList<ObjCProtocolDecl>::iterator
488              P = Data.AllReferencedProtocols.begin(),
489           PEnd = Data.AllReferencedProtocols.end();
490         P != PEnd; ++P)
491      Writer.AddDeclRef(*P, Record);
492
493    if (ObjCCategoryDecl *Cat = D->getCategoryList()) {
494      // Ensure that we write out the set of categories for this class.
495      Writer.ObjCClassesWithCategories.insert(D);
496
497      // Make sure that the categories get serialized.
498      for (; Cat; Cat = Cat->getNextClassCategory())
499        (void)Writer.GetDeclRef(Cat);
500    }
501  }
502
503  Code = serialization::DECL_OBJC_INTERFACE;
504}
505
506void ASTDeclWriter::VisitObjCIvarDecl(ObjCIvarDecl *D) {
507  VisitFieldDecl(D);
508  // FIXME: stable encoding for @public/@private/@protected/@package
509  Record.push_back(D->getAccessControl());
510  Record.push_back(D->getSynthesize());
511
512  if (!D->hasAttrs() &&
513      !D->isImplicit() &&
514      !D->isUsed(false) &&
515      !D->isInvalidDecl() &&
516      !D->isReferenced() &&
517      !D->isModulePrivate() &&
518      !D->getBitWidth() &&
519      !D->hasExtInfo() &&
520      D->getDeclName())
521    AbbrevToUse = Writer.getDeclObjCIvarAbbrev();
522
523  Code = serialization::DECL_OBJC_IVAR;
524}
525
526void ASTDeclWriter::VisitObjCProtocolDecl(ObjCProtocolDecl *D) {
527  VisitRedeclarable(D);
528  VisitObjCContainerDecl(D);
529
530  Record.push_back(D->isThisDeclarationADefinition());
531  if (D->isThisDeclarationADefinition()) {
532    Record.push_back(D->protocol_size());
533    for (ObjCProtocolDecl::protocol_iterator
534         I = D->protocol_begin(), IEnd = D->protocol_end(); I != IEnd; ++I)
535      Writer.AddDeclRef(*I, Record);
536    for (ObjCProtocolDecl::protocol_loc_iterator PL = D->protocol_loc_begin(),
537           PLEnd = D->protocol_loc_end();
538         PL != PLEnd; ++PL)
539      Writer.AddSourceLocation(*PL, Record);
540  }
541
542  Code = serialization::DECL_OBJC_PROTOCOL;
543}
544
545void ASTDeclWriter::VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D) {
546  VisitFieldDecl(D);
547  Code = serialization::DECL_OBJC_AT_DEFS_FIELD;
548}
549
550void ASTDeclWriter::VisitObjCCategoryDecl(ObjCCategoryDecl *D) {
551  VisitObjCContainerDecl(D);
552  Writer.AddSourceLocation(D->getCategoryNameLoc(), Record);
553  Writer.AddSourceLocation(D->getIvarLBraceLoc(), Record);
554  Writer.AddSourceLocation(D->getIvarRBraceLoc(), Record);
555  Writer.AddDeclRef(D->getClassInterface(), Record);
556  Record.push_back(D->protocol_size());
557  for (ObjCCategoryDecl::protocol_iterator
558       I = D->protocol_begin(), IEnd = D->protocol_end(); I != IEnd; ++I)
559    Writer.AddDeclRef(*I, Record);
560  for (ObjCCategoryDecl::protocol_loc_iterator
561         PL = D->protocol_loc_begin(), PLEnd = D->protocol_loc_end();
562       PL != PLEnd; ++PL)
563    Writer.AddSourceLocation(*PL, Record);
564  Code = serialization::DECL_OBJC_CATEGORY;
565}
566
567void ASTDeclWriter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D) {
568  VisitNamedDecl(D);
569  Writer.AddDeclRef(D->getClassInterface(), Record);
570  Code = serialization::DECL_OBJC_COMPATIBLE_ALIAS;
571}
572
573void ASTDeclWriter::VisitObjCPropertyDecl(ObjCPropertyDecl *D) {
574  VisitNamedDecl(D);
575  Writer.AddSourceLocation(D->getAtLoc(), Record);
576  Writer.AddSourceLocation(D->getLParenLoc(), Record);
577  Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record);
578  // FIXME: stable encoding
579  Record.push_back((unsigned)D->getPropertyAttributes());
580  Record.push_back((unsigned)D->getPropertyAttributesAsWritten());
581  // FIXME: stable encoding
582  Record.push_back((unsigned)D->getPropertyImplementation());
583  Writer.AddDeclarationName(D->getGetterName(), Record);
584  Writer.AddDeclarationName(D->getSetterName(), Record);
585  Writer.AddDeclRef(D->getGetterMethodDecl(), Record);
586  Writer.AddDeclRef(D->getSetterMethodDecl(), Record);
587  Writer.AddDeclRef(D->getPropertyIvarDecl(), Record);
588  Code = serialization::DECL_OBJC_PROPERTY;
589}
590
591void ASTDeclWriter::VisitObjCImplDecl(ObjCImplDecl *D) {
592  VisitObjCContainerDecl(D);
593  Writer.AddDeclRef(D->getClassInterface(), Record);
594  // Abstract class (no need to define a stable serialization::DECL code).
595}
596
597void ASTDeclWriter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D) {
598  VisitObjCImplDecl(D);
599  Writer.AddIdentifierRef(D->getIdentifier(), Record);
600  Writer.AddSourceLocation(D->getCategoryNameLoc(), Record);
601  Code = serialization::DECL_OBJC_CATEGORY_IMPL;
602}
603
604void ASTDeclWriter::VisitObjCImplementationDecl(ObjCImplementationDecl *D) {
605  VisitObjCImplDecl(D);
606  Writer.AddDeclRef(D->getSuperClass(), Record);
607  Writer.AddSourceLocation(D->getIvarLBraceLoc(), Record);
608  Writer.AddSourceLocation(D->getIvarRBraceLoc(), Record);
609  Record.push_back(D->hasNonZeroConstructors());
610  Record.push_back(D->hasDestructors());
611  Writer.AddCXXCtorInitializers(D->IvarInitializers, D->NumIvarInitializers,
612                                Record);
613  Code = serialization::DECL_OBJC_IMPLEMENTATION;
614}
615
616void ASTDeclWriter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D) {
617  VisitDecl(D);
618  Writer.AddSourceLocation(D->getLocStart(), Record);
619  Writer.AddDeclRef(D->getPropertyDecl(), Record);
620  Writer.AddDeclRef(D->getPropertyIvarDecl(), Record);
621  Writer.AddSourceLocation(D->getPropertyIvarDeclLoc(), Record);
622  Writer.AddStmt(D->getGetterCXXConstructor());
623  Writer.AddStmt(D->getSetterCXXAssignment());
624  Code = serialization::DECL_OBJC_PROPERTY_IMPL;
625}
626
627void ASTDeclWriter::VisitFieldDecl(FieldDecl *D) {
628  VisitDeclaratorDecl(D);
629  Record.push_back(D->isMutable());
630  if (D->InitializerOrBitWidth.getInt() != ICIS_NoInit ||
631      D->InitializerOrBitWidth.getPointer()) {
632    Record.push_back(D->InitializerOrBitWidth.getInt() + 1);
633    Writer.AddStmt(D->InitializerOrBitWidth.getPointer());
634  } else {
635    Record.push_back(0);
636  }
637  if (!D->getDeclName())
638    Writer.AddDeclRef(Context.getInstantiatedFromUnnamedFieldDecl(D), Record);
639
640  if (!D->hasAttrs() &&
641      !D->isImplicit() &&
642      !D->isUsed(false) &&
643      !D->isInvalidDecl() &&
644      !D->isReferenced() &&
645      !D->isTopLevelDeclInObjCContainer() &&
646      !D->isModulePrivate() &&
647      !D->getBitWidth() &&
648      !D->hasInClassInitializer() &&
649      !D->hasExtInfo() &&
650      !ObjCIvarDecl::classofKind(D->getKind()) &&
651      !ObjCAtDefsFieldDecl::classofKind(D->getKind()) &&
652      D->getDeclName())
653    AbbrevToUse = Writer.getDeclFieldAbbrev();
654
655  Code = serialization::DECL_FIELD;
656}
657
658void ASTDeclWriter::VisitIndirectFieldDecl(IndirectFieldDecl *D) {
659  VisitValueDecl(D);
660  Record.push_back(D->getChainingSize());
661
662  for (IndirectFieldDecl::chain_iterator
663       P = D->chain_begin(),
664       PEnd = D->chain_end(); P != PEnd; ++P)
665    Writer.AddDeclRef(*P, Record);
666  Code = serialization::DECL_INDIRECTFIELD;
667}
668
669void ASTDeclWriter::VisitVarDecl(VarDecl *D) {
670  VisitRedeclarable(D);
671  VisitDeclaratorDecl(D);
672  Record.push_back(D->getStorageClass()); // FIXME: stable encoding
673  Record.push_back(D->getStorageClassAsWritten());
674  Record.push_back(D->isThreadSpecified());
675  Record.push_back(D->getInitStyle());
676  Record.push_back(D->isExceptionVariable());
677  Record.push_back(D->isNRVOVariable());
678  Record.push_back(D->isCXXForRangeDecl());
679  Record.push_back(D->isARCPseudoStrong());
680  Record.push_back(D->isConstexpr());
681
682  if (D->getInit()) {
683    Record.push_back(!D->isInitKnownICE() ? 1 : (D->isInitICE() ? 3 : 2));
684    Writer.AddStmt(D->getInit());
685  } else {
686    Record.push_back(0);
687  }
688
689  MemberSpecializationInfo *SpecInfo
690    = D->isStaticDataMember() ? D->getMemberSpecializationInfo() : 0;
691  Record.push_back(SpecInfo != 0);
692  if (SpecInfo) {
693    Writer.AddDeclRef(SpecInfo->getInstantiatedFrom(), Record);
694    Record.push_back(SpecInfo->getTemplateSpecializationKind());
695    Writer.AddSourceLocation(SpecInfo->getPointOfInstantiation(), Record);
696  }
697
698  if (!D->hasAttrs() &&
699      !D->isImplicit() &&
700      !D->isUsed(false) &&
701      !D->isInvalidDecl() &&
702      !D->isReferenced() &&
703      !D->isTopLevelDeclInObjCContainer() &&
704      D->getAccess() == AS_none &&
705      !D->isModulePrivate() &&
706      D->getDeclName().getNameKind() == DeclarationName::Identifier &&
707      !D->hasExtInfo() &&
708      D->getFirstDeclaration() == D->getMostRecentDecl() &&
709      D->getInitStyle() == VarDecl::CInit &&
710      D->getInit() == 0 &&
711      !isa<ParmVarDecl>(D) &&
712      !D->isConstexpr() &&
713      !SpecInfo)
714    AbbrevToUse = Writer.getDeclVarAbbrev();
715
716  Code = serialization::DECL_VAR;
717}
718
719void ASTDeclWriter::VisitImplicitParamDecl(ImplicitParamDecl *D) {
720  VisitVarDecl(D);
721  Code = serialization::DECL_IMPLICIT_PARAM;
722}
723
724void ASTDeclWriter::VisitParmVarDecl(ParmVarDecl *D) {
725  VisitVarDecl(D);
726  Record.push_back(D->isObjCMethodParameter());
727  Record.push_back(D->getFunctionScopeDepth());
728  Record.push_back(D->getFunctionScopeIndex());
729  Record.push_back(D->getObjCDeclQualifier()); // FIXME: stable encoding
730  Record.push_back(D->isKNRPromoted());
731  Record.push_back(D->hasInheritedDefaultArg());
732  Record.push_back(D->hasUninstantiatedDefaultArg());
733  if (D->hasUninstantiatedDefaultArg())
734    Writer.AddStmt(D->getUninstantiatedDefaultArg());
735  Code = serialization::DECL_PARM_VAR;
736
737  assert(!D->isARCPseudoStrong()); // can be true of ImplicitParamDecl
738
739  // If the assumptions about the DECL_PARM_VAR abbrev are true, use it.  Here
740  // we dynamically check for the properties that we optimize for, but don't
741  // know are true of all PARM_VAR_DECLs.
742  if (!D->hasAttrs() &&
743      !D->hasExtInfo() &&
744      !D->isImplicit() &&
745      !D->isUsed(false) &&
746      !D->isInvalidDecl() &&
747      !D->isReferenced() &&
748      D->getAccess() == AS_none &&
749      !D->isModulePrivate() &&
750      D->getStorageClass() == 0 &&
751      D->getInitStyle() == VarDecl::CInit && // Can params have anything else?
752      D->getFunctionScopeDepth() == 0 &&
753      D->getObjCDeclQualifier() == 0 &&
754      !D->isKNRPromoted() &&
755      !D->hasInheritedDefaultArg() &&
756      D->getInit() == 0 &&
757      !D->hasUninstantiatedDefaultArg())  // No default expr.
758    AbbrevToUse = Writer.getDeclParmVarAbbrev();
759
760  // Check things we know are true of *every* PARM_VAR_DECL, which is more than
761  // just us assuming it.
762  assert(!D->isThreadSpecified() && "PARM_VAR_DECL can't be __thread");
763  assert(D->getAccess() == AS_none && "PARM_VAR_DECL can't be public/private");
764  assert(!D->isExceptionVariable() && "PARM_VAR_DECL can't be exception var");
765  assert(D->getPreviousDecl() == 0 && "PARM_VAR_DECL can't be redecl");
766  assert(!D->isStaticDataMember() &&
767         "PARM_VAR_DECL can't be static data member");
768}
769
770void ASTDeclWriter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
771  VisitDecl(D);
772  Writer.AddStmt(D->getAsmString());
773  Writer.AddSourceLocation(D->getRParenLoc(), Record);
774  Code = serialization::DECL_FILE_SCOPE_ASM;
775}
776
777void ASTDeclWriter::VisitBlockDecl(BlockDecl *D) {
778  VisitDecl(D);
779  Writer.AddStmt(D->getBody());
780  Writer.AddTypeSourceInfo(D->getSignatureAsWritten(), Record);
781  Record.push_back(D->param_size());
782  for (FunctionDecl::param_iterator P = D->param_begin(), PEnd = D->param_end();
783       P != PEnd; ++P)
784    Writer.AddDeclRef(*P, Record);
785  Record.push_back(D->isVariadic());
786  Record.push_back(D->blockMissingReturnType());
787  Record.push_back(D->isConversionFromLambda());
788  Record.push_back(D->capturesCXXThis());
789  Record.push_back(D->getNumCaptures());
790  for (BlockDecl::capture_iterator
791         i = D->capture_begin(), e = D->capture_end(); i != e; ++i) {
792    const BlockDecl::Capture &capture = *i;
793    Writer.AddDeclRef(capture.getVariable(), Record);
794
795    unsigned flags = 0;
796    if (capture.isByRef()) flags |= 1;
797    if (capture.isNested()) flags |= 2;
798    if (capture.hasCopyExpr()) flags |= 4;
799    Record.push_back(flags);
800
801    if (capture.hasCopyExpr()) Writer.AddStmt(capture.getCopyExpr());
802  }
803
804  Code = serialization::DECL_BLOCK;
805}
806
807void ASTDeclWriter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
808  VisitDecl(D);
809  Record.push_back(D->getLanguage());
810  Writer.AddSourceLocation(D->getExternLoc(), Record);
811  Writer.AddSourceLocation(D->getRBraceLoc(), Record);
812  Code = serialization::DECL_LINKAGE_SPEC;
813}
814
815void ASTDeclWriter::VisitLabelDecl(LabelDecl *D) {
816  VisitNamedDecl(D);
817  Writer.AddSourceLocation(D->getLocStart(), Record);
818  Code = serialization::DECL_LABEL;
819}
820
821
822void ASTDeclWriter::VisitNamespaceDecl(NamespaceDecl *D) {
823  VisitRedeclarable(D);
824  VisitNamedDecl(D);
825  Record.push_back(D->isInline());
826  Writer.AddSourceLocation(D->getLocStart(), Record);
827  Writer.AddSourceLocation(D->getRBraceLoc(), Record);
828
829  if (D->isOriginalNamespace())
830    Writer.AddDeclRef(D->getAnonymousNamespace(), Record);
831  Code = serialization::DECL_NAMESPACE;
832
833  if (Writer.hasChain() && !D->isOriginalNamespace() &&
834      D->getOriginalNamespace()->isFromASTFile()) {
835    NamespaceDecl *NS = D->getOriginalNamespace();
836    Writer.AddUpdatedDeclContext(NS);
837
838    // Make sure all visible decls are written. They will be recorded later.
839    if (StoredDeclsMap *Map = NS->buildLookup()) {
840      for (StoredDeclsMap::iterator D = Map->begin(), DEnd = Map->end();
841           D != DEnd; ++D) {
842        DeclContext::lookup_result Result = D->second.getLookupResult();
843        while (Result.first != Result.second) {
844          Writer.GetDeclRef(*Result.first);
845          ++Result.first;
846        }
847      }
848    }
849  }
850
851  if (Writer.hasChain() && D->isAnonymousNamespace() &&
852      D == D->getMostRecentDecl()) {
853    // This is a most recent reopening of the anonymous namespace. If its parent
854    // is in a previous PCH (or is the TU), mark that parent for update, because
855    // the original namespace always points to the latest re-opening of its
856    // anonymous namespace.
857    Decl *Parent = cast<Decl>(
858        D->getParent()->getRedeclContext()->getPrimaryContext());
859    if (Parent->isFromASTFile() || isa<TranslationUnitDecl>(Parent)) {
860      ASTWriter::UpdateRecord &Record = Writer.DeclUpdates[Parent];
861      Record.push_back(UPD_CXX_ADDED_ANONYMOUS_NAMESPACE);
862      Writer.AddDeclRef(D, Record);
863    }
864  }
865}
866
867void ASTDeclWriter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
868  VisitNamedDecl(D);
869  Writer.AddSourceLocation(D->getNamespaceLoc(), Record);
870  Writer.AddSourceLocation(D->getTargetNameLoc(), Record);
871  Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
872  Writer.AddDeclRef(D->getNamespace(), Record);
873  Code = serialization::DECL_NAMESPACE_ALIAS;
874}
875
876void ASTDeclWriter::VisitUsingDecl(UsingDecl *D) {
877  VisitNamedDecl(D);
878  Writer.AddSourceLocation(D->getUsingLocation(), Record);
879  Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
880  Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
881  Writer.AddDeclRef(D->FirstUsingShadow.getPointer(), Record);
882  Record.push_back(D->isTypeName());
883  Writer.AddDeclRef(Context.getInstantiatedFromUsingDecl(D), Record);
884  Code = serialization::DECL_USING;
885}
886
887void ASTDeclWriter::VisitUsingShadowDecl(UsingShadowDecl *D) {
888  VisitNamedDecl(D);
889  Writer.AddDeclRef(D->getTargetDecl(), Record);
890  Writer.AddDeclRef(D->UsingOrNextShadow, Record);
891  Writer.AddDeclRef(Context.getInstantiatedFromUsingShadowDecl(D), Record);
892  Code = serialization::DECL_USING_SHADOW;
893}
894
895void ASTDeclWriter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
896  VisitNamedDecl(D);
897  Writer.AddSourceLocation(D->getUsingLoc(), Record);
898  Writer.AddSourceLocation(D->getNamespaceKeyLocation(), Record);
899  Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
900  Writer.AddDeclRef(D->getNominatedNamespace(), Record);
901  Writer.AddDeclRef(dyn_cast<Decl>(D->getCommonAncestor()), Record);
902  Code = serialization::DECL_USING_DIRECTIVE;
903}
904
905void ASTDeclWriter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
906  VisitValueDecl(D);
907  Writer.AddSourceLocation(D->getUsingLoc(), Record);
908  Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
909  Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
910  Code = serialization::DECL_UNRESOLVED_USING_VALUE;
911}
912
913void ASTDeclWriter::VisitUnresolvedUsingTypenameDecl(
914                                               UnresolvedUsingTypenameDecl *D) {
915  VisitTypeDecl(D);
916  Writer.AddSourceLocation(D->getTypenameLoc(), Record);
917  Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
918  Code = serialization::DECL_UNRESOLVED_USING_TYPENAME;
919}
920
921void ASTDeclWriter::VisitCXXRecordDecl(CXXRecordDecl *D) {
922  VisitRecordDecl(D);
923  Record.push_back(D->isThisDeclarationADefinition());
924  if (D->isThisDeclarationADefinition())
925    Writer.AddCXXDefinitionData(D, Record);
926
927  enum {
928    CXXRecNotTemplate = 0, CXXRecTemplate, CXXRecMemberSpecialization
929  };
930  if (ClassTemplateDecl *TemplD = D->getDescribedClassTemplate()) {
931    Record.push_back(CXXRecTemplate);
932    Writer.AddDeclRef(TemplD, Record);
933  } else if (MemberSpecializationInfo *MSInfo
934               = D->getMemberSpecializationInfo()) {
935    Record.push_back(CXXRecMemberSpecialization);
936    Writer.AddDeclRef(MSInfo->getInstantiatedFrom(), Record);
937    Record.push_back(MSInfo->getTemplateSpecializationKind());
938    Writer.AddSourceLocation(MSInfo->getPointOfInstantiation(), Record);
939  } else {
940    Record.push_back(CXXRecNotTemplate);
941  }
942
943  // Store the key function to avoid deserializing every method so we can
944  // compute it.
945  if (D->IsCompleteDefinition)
946    Writer.AddDeclRef(Context.getKeyFunction(D), Record);
947
948  Code = serialization::DECL_CXX_RECORD;
949}
950
951void ASTDeclWriter::VisitCXXMethodDecl(CXXMethodDecl *D) {
952  VisitFunctionDecl(D);
953  if (D->isCanonicalDecl()) {
954    Record.push_back(D->size_overridden_methods());
955    for (CXXMethodDecl::method_iterator
956           I = D->begin_overridden_methods(), E = D->end_overridden_methods();
957           I != E; ++I)
958      Writer.AddDeclRef(*I, Record);
959  } else {
960    // We only need to record overridden methods once for the canonical decl.
961    Record.push_back(0);
962  }
963  Code = serialization::DECL_CXX_METHOD;
964}
965
966void ASTDeclWriter::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
967  VisitCXXMethodDecl(D);
968
969  Record.push_back(D->IsExplicitSpecified);
970  Record.push_back(D->ImplicitlyDefined);
971  Writer.AddCXXCtorInitializers(D->CtorInitializers, D->NumCtorInitializers,
972                                Record);
973
974  Code = serialization::DECL_CXX_CONSTRUCTOR;
975}
976
977void ASTDeclWriter::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
978  VisitCXXMethodDecl(D);
979
980  Record.push_back(D->ImplicitlyDefined);
981  Writer.AddDeclRef(D->OperatorDelete, Record);
982
983  Code = serialization::DECL_CXX_DESTRUCTOR;
984}
985
986void ASTDeclWriter::VisitCXXConversionDecl(CXXConversionDecl *D) {
987  VisitCXXMethodDecl(D);
988  Record.push_back(D->IsExplicitSpecified);
989  Code = serialization::DECL_CXX_CONVERSION;
990}
991
992void ASTDeclWriter::VisitImportDecl(ImportDecl *D) {
993  VisitDecl(D);
994  Record.push_back(Writer.getSubmoduleID(D->getImportedModule()));
995  ArrayRef<SourceLocation> IdentifierLocs = D->getIdentifierLocs();
996  Record.push_back(!IdentifierLocs.empty());
997  if (IdentifierLocs.empty()) {
998    Writer.AddSourceLocation(D->getLocEnd(), Record);
999    Record.push_back(1);
1000  } else {
1001    for (unsigned I = 0, N = IdentifierLocs.size(); I != N; ++I)
1002      Writer.AddSourceLocation(IdentifierLocs[I], Record);
1003    Record.push_back(IdentifierLocs.size());
1004  }
1005  // Note: the number of source locations must always be the last element in
1006  // the record.
1007  Code = serialization::DECL_IMPORT;
1008}
1009
1010void ASTDeclWriter::VisitAccessSpecDecl(AccessSpecDecl *D) {
1011  VisitDecl(D);
1012  Writer.AddSourceLocation(D->getColonLoc(), Record);
1013  Code = serialization::DECL_ACCESS_SPEC;
1014}
1015
1016void ASTDeclWriter::VisitFriendDecl(FriendDecl *D) {
1017  VisitDecl(D);
1018  Record.push_back(D->Friend.is<TypeSourceInfo*>());
1019  if (D->Friend.is<TypeSourceInfo*>())
1020    Writer.AddTypeSourceInfo(D->Friend.get<TypeSourceInfo*>(), Record);
1021  else
1022    Writer.AddDeclRef(D->Friend.get<NamedDecl*>(), Record);
1023  Writer.AddDeclRef(D->getNextFriend(), Record);
1024  Record.push_back(D->UnsupportedFriend);
1025  Writer.AddSourceLocation(D->FriendLoc, Record);
1026  Code = serialization::DECL_FRIEND;
1027}
1028
1029void ASTDeclWriter::VisitFriendTemplateDecl(FriendTemplateDecl *D) {
1030  VisitDecl(D);
1031  Record.push_back(D->getNumTemplateParameters());
1032  for (unsigned i = 0, e = D->getNumTemplateParameters(); i != e; ++i)
1033    Writer.AddTemplateParameterList(D->getTemplateParameterList(i), Record);
1034  Record.push_back(D->getFriendDecl() != 0);
1035  if (D->getFriendDecl())
1036    Writer.AddDeclRef(D->getFriendDecl(), Record);
1037  else
1038    Writer.AddTypeSourceInfo(D->getFriendType(), Record);
1039  Writer.AddSourceLocation(D->getFriendLoc(), Record);
1040  Code = serialization::DECL_FRIEND_TEMPLATE;
1041}
1042
1043void ASTDeclWriter::VisitTemplateDecl(TemplateDecl *D) {
1044  VisitNamedDecl(D);
1045
1046  Writer.AddDeclRef(D->getTemplatedDecl(), Record);
1047  Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1048}
1049
1050void ASTDeclWriter::VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D) {
1051  VisitRedeclarable(D);
1052
1053  // Emit data to initialize CommonOrPrev before VisitTemplateDecl so that
1054  // getCommonPtr() can be used while this is still initializing.
1055  if (D->isFirstDeclaration()) {
1056    // This declaration owns the 'common' pointer, so serialize that data now.
1057    Writer.AddDeclRef(D->getInstantiatedFromMemberTemplate(), Record);
1058    if (D->getInstantiatedFromMemberTemplate())
1059      Record.push_back(D->isMemberSpecialization());
1060  }
1061
1062  VisitTemplateDecl(D);
1063  Record.push_back(D->getIdentifierNamespace());
1064}
1065
1066void ASTDeclWriter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1067  VisitRedeclarableTemplateDecl(D);
1068
1069  if (D->isFirstDeclaration()) {
1070    typedef llvm::FoldingSetVector<ClassTemplateSpecializationDecl> CTSDSetTy;
1071    CTSDSetTy &CTSDSet = D->getSpecializations();
1072    Record.push_back(CTSDSet.size());
1073    for (CTSDSetTy::iterator I=CTSDSet.begin(), E = CTSDSet.end(); I!=E; ++I) {
1074      assert(I->isCanonicalDecl() && "Expected only canonical decls in set");
1075      Writer.AddDeclRef(&*I, Record);
1076    }
1077
1078    typedef llvm::FoldingSetVector<ClassTemplatePartialSpecializationDecl>
1079      CTPSDSetTy;
1080    CTPSDSetTy &CTPSDSet = D->getPartialSpecializations();
1081    Record.push_back(CTPSDSet.size());
1082    for (CTPSDSetTy::iterator I=CTPSDSet.begin(), E=CTPSDSet.end(); I!=E; ++I) {
1083      assert(I->isCanonicalDecl() && "Expected only canonical decls in set");
1084      Writer.AddDeclRef(&*I, Record);
1085    }
1086
1087    Writer.AddTypeRef(D->getCommonPtr()->InjectedClassNameType, Record);
1088  }
1089  Code = serialization::DECL_CLASS_TEMPLATE;
1090}
1091
1092void ASTDeclWriter::VisitClassTemplateSpecializationDecl(
1093                                           ClassTemplateSpecializationDecl *D) {
1094  VisitCXXRecordDecl(D);
1095
1096  llvm::PointerUnion<ClassTemplateDecl *,
1097                     ClassTemplatePartialSpecializationDecl *> InstFrom
1098    = D->getSpecializedTemplateOrPartial();
1099  if (Decl *InstFromD = InstFrom.dyn_cast<ClassTemplateDecl *>()) {
1100    Writer.AddDeclRef(InstFromD, Record);
1101  } else {
1102    Writer.AddDeclRef(InstFrom.get<ClassTemplatePartialSpecializationDecl *>(),
1103                      Record);
1104    Writer.AddTemplateArgumentList(&D->getTemplateInstantiationArgs(), Record);
1105  }
1106
1107  // Explicit info.
1108  Writer.AddTypeSourceInfo(D->getTypeAsWritten(), Record);
1109  if (D->getTypeAsWritten()) {
1110    Writer.AddSourceLocation(D->getExternLoc(), Record);
1111    Writer.AddSourceLocation(D->getTemplateKeywordLoc(), Record);
1112  }
1113
1114  Writer.AddTemplateArgumentList(&D->getTemplateArgs(), Record);
1115  Writer.AddSourceLocation(D->getPointOfInstantiation(), Record);
1116  Record.push_back(D->getSpecializationKind());
1117  Record.push_back(D->isCanonicalDecl());
1118
1119  if (D->isCanonicalDecl()) {
1120    // When reading, we'll add it to the folding set of the following template.
1121    Writer.AddDeclRef(D->getSpecializedTemplate()->getCanonicalDecl(), Record);
1122  }
1123
1124  Code = serialization::DECL_CLASS_TEMPLATE_SPECIALIZATION;
1125}
1126
1127void ASTDeclWriter::VisitClassTemplatePartialSpecializationDecl(
1128                                    ClassTemplatePartialSpecializationDecl *D) {
1129  VisitClassTemplateSpecializationDecl(D);
1130
1131  Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1132
1133  Record.push_back(D->getNumTemplateArgsAsWritten());
1134  for (int i = 0, e = D->getNumTemplateArgsAsWritten(); i != e; ++i)
1135    Writer.AddTemplateArgumentLoc(D->getTemplateArgsAsWritten()[i], Record);
1136
1137  Record.push_back(D->getSequenceNumber());
1138
1139  // These are read/set from/to the first declaration.
1140  if (D->getPreviousDecl() == 0) {
1141    Writer.AddDeclRef(D->getInstantiatedFromMember(), Record);
1142    Record.push_back(D->isMemberSpecialization());
1143  }
1144
1145  Code = serialization::DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION;
1146}
1147
1148void ASTDeclWriter::VisitClassScopeFunctionSpecializationDecl(
1149                                    ClassScopeFunctionSpecializationDecl *D) {
1150  VisitDecl(D);
1151  Writer.AddDeclRef(D->getSpecialization(), Record);
1152  Code = serialization::DECL_CLASS_SCOPE_FUNCTION_SPECIALIZATION;
1153}
1154
1155
1156void ASTDeclWriter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1157  VisitRedeclarableTemplateDecl(D);
1158
1159  if (D->isFirstDeclaration()) {
1160    // This FunctionTemplateDecl owns the CommonPtr; write it.
1161
1162    // Write the function specialization declarations.
1163    Record.push_back(D->getSpecializations().size());
1164    for (llvm::FoldingSetVector<FunctionTemplateSpecializationInfo>::iterator
1165           I = D->getSpecializations().begin(),
1166           E = D->getSpecializations().end()   ; I != E; ++I) {
1167      assert(I->Function->isCanonicalDecl() &&
1168             "Expected only canonical decls in set");
1169      Writer.AddDeclRef(I->Function, Record);
1170    }
1171  }
1172  Code = serialization::DECL_FUNCTION_TEMPLATE;
1173}
1174
1175void ASTDeclWriter::VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D) {
1176  VisitTypeDecl(D);
1177
1178  Record.push_back(D->wasDeclaredWithTypename());
1179  Record.push_back(D->defaultArgumentWasInherited());
1180  Writer.AddTypeSourceInfo(D->getDefaultArgumentInfo(), Record);
1181
1182  Code = serialization::DECL_TEMPLATE_TYPE_PARM;
1183}
1184
1185void ASTDeclWriter::VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {
1186  // For an expanded parameter pack, record the number of expansion types here
1187  // so that it's easier for deserialization to allocate the right amount of
1188  // memory.
1189  if (D->isExpandedParameterPack())
1190    Record.push_back(D->getNumExpansionTypes());
1191
1192  VisitDeclaratorDecl(D);
1193  // TemplateParmPosition.
1194  Record.push_back(D->getDepth());
1195  Record.push_back(D->getPosition());
1196
1197  if (D->isExpandedParameterPack()) {
1198    for (unsigned I = 0, N = D->getNumExpansionTypes(); I != N; ++I) {
1199      Writer.AddTypeRef(D->getExpansionType(I), Record);
1200      Writer.AddTypeSourceInfo(D->getExpansionTypeSourceInfo(I), Record);
1201    }
1202
1203    Code = serialization::DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK;
1204  } else {
1205    // Rest of NonTypeTemplateParmDecl.
1206    Record.push_back(D->isParameterPack());
1207    Record.push_back(D->getDefaultArgument() != 0);
1208    if (D->getDefaultArgument()) {
1209      Writer.AddStmt(D->getDefaultArgument());
1210      Record.push_back(D->defaultArgumentWasInherited());
1211    }
1212    Code = serialization::DECL_NON_TYPE_TEMPLATE_PARM;
1213  }
1214}
1215
1216void ASTDeclWriter::VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D) {
1217  // For an expanded parameter pack, record the number of expansion types here
1218  // so that it's easier for deserialization to allocate the right amount of
1219  // memory.
1220  if (D->isExpandedParameterPack())
1221    Record.push_back(D->getNumExpansionTemplateParameters());
1222
1223  VisitTemplateDecl(D);
1224  // TemplateParmPosition.
1225  Record.push_back(D->getDepth());
1226  Record.push_back(D->getPosition());
1227
1228  if (D->isExpandedParameterPack()) {
1229    for (unsigned I = 0, N = D->getNumExpansionTemplateParameters();
1230         I != N; ++I)
1231      Writer.AddTemplateParameterList(D->getExpansionTemplateParameters(I),
1232                                      Record);
1233    Code = serialization::DECL_EXPANDED_TEMPLATE_TEMPLATE_PARM_PACK;
1234  } else {
1235    // Rest of TemplateTemplateParmDecl.
1236    Writer.AddTemplateArgumentLoc(D->getDefaultArgument(), Record);
1237    Record.push_back(D->defaultArgumentWasInherited());
1238    Record.push_back(D->isParameterPack());
1239    Code = serialization::DECL_TEMPLATE_TEMPLATE_PARM;
1240  }
1241}
1242
1243void ASTDeclWriter::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) {
1244  VisitRedeclarableTemplateDecl(D);
1245  Code = serialization::DECL_TYPE_ALIAS_TEMPLATE;
1246}
1247
1248void ASTDeclWriter::VisitStaticAssertDecl(StaticAssertDecl *D) {
1249  VisitDecl(D);
1250  Writer.AddStmt(D->getAssertExpr());
1251  Record.push_back(D->isFailed());
1252  Writer.AddStmt(D->getMessage());
1253  Writer.AddSourceLocation(D->getRParenLoc(), Record);
1254  Code = serialization::DECL_STATIC_ASSERT;
1255}
1256
1257/// \brief Emit the DeclContext part of a declaration context decl.
1258///
1259/// \param LexicalOffset the offset at which the DECL_CONTEXT_LEXICAL
1260/// block for this declaration context is stored. May be 0 to indicate
1261/// that there are no declarations stored within this context.
1262///
1263/// \param VisibleOffset the offset at which the DECL_CONTEXT_VISIBLE
1264/// block for this declaration context is stored. May be 0 to indicate
1265/// that there are no declarations visible from this context. Note
1266/// that this value will not be emitted for non-primary declaration
1267/// contexts.
1268void ASTDeclWriter::VisitDeclContext(DeclContext *DC, uint64_t LexicalOffset,
1269                                     uint64_t VisibleOffset) {
1270  Record.push_back(LexicalOffset);
1271  Record.push_back(VisibleOffset);
1272}
1273
1274template <typename T>
1275void ASTDeclWriter::VisitRedeclarable(Redeclarable<T> *D) {
1276  T *First = D->getFirstDeclaration();
1277  if (First->getMostRecentDecl() != First) {
1278    // There is more than one declaration of this entity, so we will need to
1279    // write a redeclaration chain.
1280    Writer.AddDeclRef(First, Record);
1281    Writer.Redeclarations.insert(First);
1282
1283    // Make sure that we serialize both the previous and the most-recent
1284    // declarations, which (transitively) ensures that all declarations in the
1285    // chain get serialized.
1286    (void)Writer.GetDeclRef(D->getPreviousDecl());
1287    (void)Writer.GetDeclRef(First->getMostRecentDecl());
1288  } else {
1289    // We use the sentinel value 0 to indicate an only declaration.
1290    Record.push_back(0);
1291  }
1292
1293}
1294
1295//===----------------------------------------------------------------------===//
1296// ASTWriter Implementation
1297//===----------------------------------------------------------------------===//
1298
1299void ASTWriter::WriteDeclsBlockAbbrevs() {
1300  using namespace llvm;
1301
1302  BitCodeAbbrev *Abv;
1303
1304  // Abbreviation for DECL_FIELD
1305  Abv = new BitCodeAbbrev();
1306  Abv->Add(BitCodeAbbrevOp(serialization::DECL_FIELD));
1307  // Decl
1308  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1309  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1310  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1311  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1312  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1313  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1314  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1315  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1316  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1317  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1318  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1319  // NamedDecl
1320  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1321  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1322  // ValueDecl
1323  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1324  // DeclaratorDecl
1325  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1326  Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1327  // FieldDecl
1328  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1329  Abv->Add(BitCodeAbbrevOp(0));                       //getBitWidth
1330  // Type Source Info
1331  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1332  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1333  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1334  DeclFieldAbbrev = Stream.EmitAbbrev(Abv);
1335
1336  // Abbreviation for DECL_OBJC_IVAR
1337  Abv = new BitCodeAbbrev();
1338  Abv->Add(BitCodeAbbrevOp(serialization::DECL_OBJC_IVAR));
1339  // Decl
1340  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1341  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1342  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1343  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1344  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1345  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1346  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1347  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1348  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1349  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1350  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1351  // NamedDecl
1352  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1353  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1354  // ValueDecl
1355  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1356  // DeclaratorDecl
1357  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1358  Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1359  // FieldDecl
1360  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1361  Abv->Add(BitCodeAbbrevOp(0));                       //getBitWidth
1362  // ObjC Ivar
1363  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getAccessControl
1364  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getSynthesize
1365  // Type Source Info
1366  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1367  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1368  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1369  DeclObjCIvarAbbrev = Stream.EmitAbbrev(Abv);
1370
1371  // Abbreviation for DECL_ENUM
1372  Abv = new BitCodeAbbrev();
1373  Abv->Add(BitCodeAbbrevOp(serialization::DECL_ENUM));
1374  // Redeclarable
1375  Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1376  // Decl
1377  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1378  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1379  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1380  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1381  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1382  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1383  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1384  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1385  Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1386  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1387  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1388  // NamedDecl
1389  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1390  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1391  // TypeDecl
1392  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1393  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1394  // TagDecl
1395  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1396  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1397  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1398  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1399  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1400  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1401  Abv->Add(BitCodeAbbrevOp(0));                         // hasExtInfo
1402  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // TypedefNameAnonDecl
1403  // EnumDecl
1404  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // AddTypeRef
1405  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IntegerType
1406  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getPromotionType
1407  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumPositiveBits
1408  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumNegativeBits
1409  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScoped
1410  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScopedUsingClassTag
1411  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isFixed
1412  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // InstantiatedMembEnum
1413  // DC
1414  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1415  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1416  DeclEnumAbbrev = Stream.EmitAbbrev(Abv);
1417
1418  // Abbreviation for DECL_RECORD
1419  Abv = new BitCodeAbbrev();
1420  Abv->Add(BitCodeAbbrevOp(serialization::DECL_RECORD));
1421  // Redeclarable
1422  Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1423  // Decl
1424  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1425  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1426  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1427  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1428  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1429  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1430  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1431  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1432  Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1433  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1434  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1435  // NamedDecl
1436  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1437  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1438  // TypeDecl
1439  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1440  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1441  // TagDecl
1442  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1443  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1444  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1445  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1446  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1447  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1448  Abv->Add(BitCodeAbbrevOp(0));                         // hasExtInfo
1449  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // TypedefNameAnonDecl
1450  // RecordDecl
1451  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // FlexibleArrayMember
1452  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // AnonymousStructUnion
1453  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasObjectMember
1454  // DC
1455  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1456  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1457  DeclRecordAbbrev = Stream.EmitAbbrev(Abv);
1458
1459  // Abbreviation for DECL_PARM_VAR
1460  Abv = new BitCodeAbbrev();
1461  Abv->Add(BitCodeAbbrevOp(serialization::DECL_PARM_VAR));
1462  // Redeclarable
1463  Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1464  // Decl
1465  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1466  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1467  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1468  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1469  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1470  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1471  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1472  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1473  Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1474  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1475  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1476  // NamedDecl
1477  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1478  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1479  // ValueDecl
1480  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1481  // DeclaratorDecl
1482  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1483  Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1484  // VarDecl
1485  Abv->Add(BitCodeAbbrevOp(0));                       // StorageClass
1486  Abv->Add(BitCodeAbbrevOp(0));                       // StorageClassAsWritten
1487  Abv->Add(BitCodeAbbrevOp(0));                       // isThreadSpecified
1488  Abv->Add(BitCodeAbbrevOp(0));                       // hasCXXDirectInitializer
1489  Abv->Add(BitCodeAbbrevOp(0));                       // isExceptionVariable
1490  Abv->Add(BitCodeAbbrevOp(0));                       // isNRVOVariable
1491  Abv->Add(BitCodeAbbrevOp(0));                       // isCXXForRangeDecl
1492  Abv->Add(BitCodeAbbrevOp(0));                       // isARCPseudoStrong
1493  Abv->Add(BitCodeAbbrevOp(0));                       // isConstexpr
1494  Abv->Add(BitCodeAbbrevOp(0));                       // HasInit
1495  Abv->Add(BitCodeAbbrevOp(0));                   // HasMemberSpecializationInfo
1496  // ParmVarDecl
1497  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsObjCMethodParameter
1498  Abv->Add(BitCodeAbbrevOp(0));                       // ScopeDepth
1499  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ScopeIndex
1500  Abv->Add(BitCodeAbbrevOp(0));                       // ObjCDeclQualifier
1501  Abv->Add(BitCodeAbbrevOp(0));                       // KNRPromoted
1502  Abv->Add(BitCodeAbbrevOp(0));                       // HasInheritedDefaultArg
1503  Abv->Add(BitCodeAbbrevOp(0));                   // HasUninstantiatedDefaultArg
1504  // Type Source Info
1505  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1506  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1507  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1508  DeclParmVarAbbrev = Stream.EmitAbbrev(Abv);
1509
1510  // Abbreviation for DECL_TYPEDEF
1511  Abv = new BitCodeAbbrev();
1512  Abv->Add(BitCodeAbbrevOp(serialization::DECL_TYPEDEF));
1513  // Redeclarable
1514  Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1515  // Decl
1516  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1517  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1518  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1519  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1520  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1521  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1522  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1523  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1524  Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1525  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1526  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1527  // NamedDecl
1528  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1529  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1530  // TypeDecl
1531  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1532  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1533  // TypedefDecl
1534  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1535  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1536  DeclTypedefAbbrev = Stream.EmitAbbrev(Abv);
1537
1538  // Abbreviation for DECL_VAR
1539  Abv = new BitCodeAbbrev();
1540  Abv->Add(BitCodeAbbrevOp(serialization::DECL_VAR));
1541  // Redeclarable
1542  Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
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  // ValueDecl
1559  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1560  // DeclaratorDecl
1561  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1562  Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1563  // VarDecl
1564  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // StorageClass
1565  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // StorageClassAsWritten
1566  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isThreadSpecified
1567  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // CXXDirectInitializer
1568  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isExceptionVariable
1569  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isNRVOVariable
1570  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCXXForRangeDecl
1571  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isARCPseudoStrong
1572  Abv->Add(BitCodeAbbrevOp(0));                         // isConstexpr
1573  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // HasInit
1574  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // HasMemberSpecInfo
1575  // Type Source Info
1576  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1577  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1578  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1579  DeclVarAbbrev = Stream.EmitAbbrev(Abv);
1580
1581  // Abbreviation for EXPR_DECL_REF
1582  Abv = new BitCodeAbbrev();
1583  Abv->Add(BitCodeAbbrevOp(serialization::EXPR_DECL_REF));
1584  //Stmt
1585  //Expr
1586  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1587  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
1588  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
1589  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
1590  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
1591  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
1592  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
1593  //DeclRefExpr
1594  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HasQualifier
1595  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //GetDeclFound
1596  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ExplicitTemplateArgs
1597  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HadMultipleCandidates
1598  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //RefersToEnclosingLocal
1599  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclRef
1600  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1601  DeclRefExprAbbrev = Stream.EmitAbbrev(Abv);
1602
1603  // Abbreviation for EXPR_INTEGER_LITERAL
1604  Abv = new BitCodeAbbrev();
1605  Abv->Add(BitCodeAbbrevOp(serialization::EXPR_INTEGER_LITERAL));
1606  //Stmt
1607  //Expr
1608  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1609  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
1610  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
1611  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
1612  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
1613  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
1614  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
1615  //Integer Literal
1616  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1617  Abv->Add(BitCodeAbbrevOp(32));                      // Bit Width
1618  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Value
1619  IntegerLiteralAbbrev = Stream.EmitAbbrev(Abv);
1620
1621  // Abbreviation for EXPR_CHARACTER_LITERAL
1622  Abv = new BitCodeAbbrev();
1623  Abv->Add(BitCodeAbbrevOp(serialization::EXPR_CHARACTER_LITERAL));
1624  //Stmt
1625  //Expr
1626  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1627  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
1628  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
1629  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
1630  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
1631  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
1632  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
1633  //Character Literal
1634  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getValue
1635  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1636  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // getKind
1637  CharacterLiteralAbbrev = Stream.EmitAbbrev(Abv);
1638
1639  Abv = new BitCodeAbbrev();
1640  Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_LEXICAL));
1641  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1642  DeclContextLexicalAbbrev = Stream.EmitAbbrev(Abv);
1643
1644  Abv = new BitCodeAbbrev();
1645  Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_VISIBLE));
1646  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1647  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1648  DeclContextVisibleLookupAbbrev = Stream.EmitAbbrev(Abv);
1649}
1650
1651/// isRequiredDecl - Check if this is a "required" Decl, which must be seen by
1652/// consumers of the AST.
1653///
1654/// Such decls will always be deserialized from the AST file, so we would like
1655/// this to be as restrictive as possible. Currently the predicate is driven by
1656/// code generation requirements, if other clients have a different notion of
1657/// what is "required" then we may have to consider an alternate scheme where
1658/// clients can iterate over the top-level decls and get information on them,
1659/// without necessary deserializing them. We could explicitly require such
1660/// clients to use a separate API call to "realize" the decl. This should be
1661/// relatively painless since they would presumably only do it for top-level
1662/// decls.
1663static bool isRequiredDecl(const Decl *D, ASTContext &Context) {
1664  // An ObjCMethodDecl is never considered as "required" because its
1665  // implementation container always is.
1666
1667  // File scoped assembly or obj-c implementation must be seen.
1668  if (isa<FileScopeAsmDecl>(D) || isa<ObjCImplDecl>(D))
1669    return true;
1670
1671  return Context.DeclMustBeEmitted(D);
1672}
1673
1674void ASTWriter::WriteDecl(ASTContext &Context, Decl *D) {
1675  // Switch case IDs are per Decl.
1676  ClearSwitchCaseIDs();
1677
1678  RecordData Record;
1679  ASTDeclWriter W(*this, Context, Record);
1680
1681  // Determine the ID for this declaration.
1682  serialization::DeclID ID;
1683  if (D->isFromASTFile())
1684    ID = getDeclID(D);
1685  else {
1686    serialization::DeclID &IDR = DeclIDs[D];
1687    if (IDR == 0)
1688      IDR = NextDeclID++;
1689
1690    ID= IDR;
1691  }
1692
1693  bool isReplacingADecl = ID < FirstDeclID;
1694
1695  // If this declaration is also a DeclContext, write blocks for the
1696  // declarations that lexically stored inside its context and those
1697  // declarations that are visible from its context. These blocks
1698  // are written before the declaration itself so that we can put
1699  // their offsets into the record for the declaration.
1700  uint64_t LexicalOffset = 0;
1701  uint64_t VisibleOffset = 0;
1702  DeclContext *DC = dyn_cast<DeclContext>(D);
1703  if (DC) {
1704    if (isReplacingADecl) {
1705      // It is replacing a decl from a chained PCH; make sure that the
1706      // DeclContext is fully loaded.
1707      if (DC->hasExternalLexicalStorage())
1708        DC->LoadLexicalDeclsFromExternalStorage();
1709      if (DC->hasExternalVisibleStorage())
1710        Chain->completeVisibleDeclsMap(DC);
1711    }
1712    LexicalOffset = WriteDeclContextLexicalBlock(Context, DC);
1713    VisibleOffset = WriteDeclContextVisibleBlock(Context, DC);
1714  }
1715
1716  if (isReplacingADecl) {
1717    // We're replacing a decl in a previous file.
1718    ReplacedDecls.push_back(ReplacedDeclInfo(ID, Stream.GetCurrentBitNo(),
1719                                             D->getLocation()));
1720  } else {
1721    unsigned Index = ID - FirstDeclID;
1722
1723    // Record the offset for this declaration
1724    SourceLocation Loc = D->getLocation();
1725    if (DeclOffsets.size() == Index)
1726      DeclOffsets.push_back(DeclOffset(Loc, Stream.GetCurrentBitNo()));
1727    else if (DeclOffsets.size() < Index) {
1728      DeclOffsets.resize(Index+1);
1729      DeclOffsets[Index].setLocation(Loc);
1730      DeclOffsets[Index].BitOffset = Stream.GetCurrentBitNo();
1731    }
1732
1733    SourceManager &SM = Context.getSourceManager();
1734    if (Loc.isValid() && SM.isLocalSourceLocation(Loc))
1735      associateDeclWithFile(D, ID);
1736  }
1737
1738  // Build and emit a record for this declaration
1739  Record.clear();
1740  W.Code = (serialization::DeclCode)0;
1741  W.AbbrevToUse = 0;
1742  W.Visit(D);
1743  if (DC) W.VisitDeclContext(DC, LexicalOffset, VisibleOffset);
1744
1745  if (!W.Code)
1746    llvm::report_fatal_error(StringRef("unexpected declaration kind '") +
1747                            D->getDeclKindName() + "'");
1748  Stream.EmitRecord(W.Code, Record, W.AbbrevToUse);
1749
1750  // Flush any expressions that were written as part of this declaration.
1751  FlushStmts();
1752
1753  // Flush C++ base specifiers, if there are any.
1754  FlushCXXBaseSpecifiers();
1755
1756  // Note "external" declarations so that we can add them to a record in the
1757  // AST file later.
1758  //
1759  // FIXME: This should be renamed, the predicate is much more complicated.
1760  if (isRequiredDecl(D, Context))
1761    ExternalDefinitions.push_back(ID);
1762}
1763