ASTWriterDecl.cpp revision d488b3a046c09f88bc3cbd79bb4df84e43a238bc 
1//===--- ASTWriterDecl.cpp - Declaration Serialization --------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10//  This file implements serialization for Declarations.
11//
12//===----------------------------------------------------------------------===//
13
14#include "clang/Serialization/ASTWriter.h"
15#include "ASTCommon.h"
16#include "clang/AST/DeclVisitor.h"
17#include "clang/AST/DeclCXX.h"
18#include "clang/AST/DeclTemplate.h"
19#include "clang/AST/Expr.h"
20#include "clang/AST/DeclContextInternals.h"
21#include "llvm/ADT/Twine.h"
22#include "llvm/Bitcode/BitstreamWriter.h"
23#include "llvm/Support/ErrorHandling.h"
24using namespace clang;
25using namespace serialization;
26
27//===----------------------------------------------------------------------===//
28// Declaration serialization
29//===----------------------------------------------------------------------===//
30
31namespace clang {
32  class ASTDeclWriter : public DeclVisitor<ASTDeclWriter, void> {
33
34    ASTWriter &Writer;
35    ASTContext &Context;
36    typedef ASTWriter::RecordData RecordData;
37    RecordData &Record;
38
39  public:
40    serialization::DeclCode Code;
41    unsigned AbbrevToUse;
42
43    ASTDeclWriter(ASTWriter &Writer, ASTContext &Context, RecordData &Record)
44      : Writer(Writer), Context(Context), Record(Record) {
45    }
46
47    void Visit(Decl *D);
48
49    void VisitDecl(Decl *D);
50    void VisitTranslationUnitDecl(TranslationUnitDecl *D);
51    void VisitNamedDecl(NamedDecl *D);
52    void VisitLabelDecl(LabelDecl *LD);
53    void VisitNamespaceDecl(NamespaceDecl *D);
54    void VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
55    void VisitNamespaceAliasDecl(NamespaceAliasDecl *D);
56    void VisitTypeDecl(TypeDecl *D);
57    void VisitTypedefDecl(TypedefDecl *D);
58    void VisitTypeAliasDecl(TypeAliasDecl *D);
59    void VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
60    void VisitTagDecl(TagDecl *D);
61    void VisitEnumDecl(EnumDecl *D);
62    void VisitRecordDecl(RecordDecl *D);
63    void VisitCXXRecordDecl(CXXRecordDecl *D);
64    void VisitClassTemplateSpecializationDecl(
65                                            ClassTemplateSpecializationDecl *D);
66    void VisitClassTemplatePartialSpecializationDecl(
67                                     ClassTemplatePartialSpecializationDecl *D);
68    void VisitClassScopeFunctionSpecializationDecl(
69                                       ClassScopeFunctionSpecializationDecl *D);
70    void VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D);
71    void VisitValueDecl(ValueDecl *D);
72    void VisitEnumConstantDecl(EnumConstantDecl *D);
73    void VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
74    void VisitDeclaratorDecl(DeclaratorDecl *D);
75    void VisitFunctionDecl(FunctionDecl *D);
76    void VisitCXXMethodDecl(CXXMethodDecl *D);
77    void VisitCXXConstructorDecl(CXXConstructorDecl *D);
78    void VisitCXXDestructorDecl(CXXDestructorDecl *D);
79    void VisitCXXConversionDecl(CXXConversionDecl *D);
80    void VisitFieldDecl(FieldDecl *D);
81    void VisitIndirectFieldDecl(IndirectFieldDecl *D);
82    void VisitVarDecl(VarDecl *D);
83    void VisitImplicitParamDecl(ImplicitParamDecl *D);
84    void VisitParmVarDecl(ParmVarDecl *D);
85    void VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D);
86    void VisitTemplateDecl(TemplateDecl *D);
87    void VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D);
88    void VisitClassTemplateDecl(ClassTemplateDecl *D);
89    void VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
90    void VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D);
91    void VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D);
92    void VisitUsingDecl(UsingDecl *D);
93    void VisitUsingShadowDecl(UsingShadowDecl *D);
94    void VisitLinkageSpecDecl(LinkageSpecDecl *D);
95    void VisitFileScopeAsmDecl(FileScopeAsmDecl *D);
96    void VisitAccessSpecDecl(AccessSpecDecl *D);
97    void VisitFriendDecl(FriendDecl *D);
98    void VisitFriendTemplateDecl(FriendTemplateDecl *D);
99    void VisitStaticAssertDecl(StaticAssertDecl *D);
100    void VisitBlockDecl(BlockDecl *D);
101
102    void VisitDeclContext(DeclContext *DC, uint64_t LexicalOffset,
103                          uint64_t VisibleOffset);
104    template <typename T> void VisitRedeclarable(Redeclarable<T> *D);
105
106
107    // FIXME: Put in the same order is DeclNodes.td?
108    void VisitObjCMethodDecl(ObjCMethodDecl *D);
109    void VisitObjCContainerDecl(ObjCContainerDecl *D);
110    void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
111    void VisitObjCIvarDecl(ObjCIvarDecl *D);
112    void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
113    void VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D);
114    void VisitObjCClassDecl(ObjCClassDecl *D);
115    void VisitObjCForwardProtocolDecl(ObjCForwardProtocolDecl *D);
116    void VisitObjCCategoryDecl(ObjCCategoryDecl *D);
117    void VisitObjCImplDecl(ObjCImplDecl *D);
118    void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
119    void VisitObjCImplementationDecl(ObjCImplementationDecl *D);
120    void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D);
121    void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
122    void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
123  };
124}
125
126void ASTDeclWriter::Visit(Decl *D) {
127  DeclVisitor<ASTDeclWriter>::Visit(D);
128
129  // Source locations require array (variable-length) abbreviations.  The
130  // abbreviation infrastructure requires that arrays are encoded last, so
131  // we handle it here in the case of those classes derived from DeclaratorDecl
132  if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)){
133    Writer.AddTypeSourceInfo(DD->getTypeSourceInfo(), Record);
134  }
135
136  // Handle FunctionDecl's body here and write it after all other Stmts/Exprs
137  // have been written. We want it last because we will not read it back when
138  // retrieving it from the AST, we'll just lazily set the offset.
139  if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
140    Record.push_back(FD->doesThisDeclarationHaveABody());
141    if (FD->doesThisDeclarationHaveABody())
142      Writer.AddStmt(FD->getBody());
143  }
144}
145
146void ASTDeclWriter::VisitDecl(Decl *D) {
147  Writer.AddDeclRef(cast_or_null<Decl>(D->getDeclContext()), Record);
148  Writer.AddDeclRef(cast_or_null<Decl>(D->getLexicalDeclContext()), Record);
149  Writer.AddSourceLocation(D->getLocation(), Record);
150  Record.push_back(D->isInvalidDecl());
151  Record.push_back(D->hasAttrs());
152  if (D->hasAttrs())
153    Writer.WriteAttributes(D->getAttrs(), Record);
154  Record.push_back(D->isImplicit());
155  Record.push_back(D->isUsed(false));
156  Record.push_back(D->isReferenced());
157  Record.push_back(D->getAccess());
158  Record.push_back(D->ModulePrivate);
159}
160
161void ASTDeclWriter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
162  llvm_unreachable("Translation units aren't directly serialized");
163}
164
165void ASTDeclWriter::VisitNamedDecl(NamedDecl *D) {
166  VisitDecl(D);
167  Writer.AddDeclarationName(D->getDeclName(), Record);
168}
169
170void ASTDeclWriter::VisitTypeDecl(TypeDecl *D) {
171  VisitNamedDecl(D);
172  Writer.AddSourceLocation(D->getLocStart(), Record);
173  Writer.AddTypeRef(QualType(D->getTypeForDecl(), 0), Record);
174}
175
176void ASTDeclWriter::VisitTypedefDecl(TypedefDecl *D) {
177  VisitTypeDecl(D);
178  Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record);
179
180  if (!D->hasAttrs() &&
181      !D->isImplicit() &&
182      !D->isUsed(false) &&
183      D->RedeclLink.getNext() == D &&
184      !D->isInvalidDecl() &&
185      !D->isReferenced() &&
186      D->getAccess() == AS_none &&
187      !D->isModulePrivate() &&
188      D->getDeclName().getNameKind() == DeclarationName::Identifier)
189    AbbrevToUse = Writer.getDeclTypedefAbbrev();
190
191  Code = serialization::DECL_TYPEDEF;
192}
193
194void ASTDeclWriter::VisitTypeAliasDecl(TypeAliasDecl *D) {
195  VisitTypeDecl(D);
196  Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record);
197  Code = serialization::DECL_TYPEALIAS;
198}
199
200void ASTDeclWriter::VisitTagDecl(TagDecl *D) {
201  VisitRedeclarable(D);
202  VisitTypeDecl(D);
203  Record.push_back(D->getIdentifierNamespace());
204  Record.push_back((unsigned)D->getTagKind()); // FIXME: stable encoding
205  Record.push_back(D->isCompleteDefinition());
206  Record.push_back(D->isEmbeddedInDeclarator());
207  Record.push_back(D->isFreeStanding());
208  Writer.AddSourceLocation(D->getRBraceLoc(), Record);
209  Record.push_back(D->hasExtInfo());
210  if (D->hasExtInfo())
211    Writer.AddQualifierInfo(*D->getExtInfo(), Record);
212  else
213    Writer.AddDeclRef(D->getTypedefNameForAnonDecl(), Record);
214}
215
216void ASTDeclWriter::VisitEnumDecl(EnumDecl *D) {
217  VisitTagDecl(D);
218  Writer.AddTypeSourceInfo(D->getIntegerTypeSourceInfo(), Record);
219  if (!D->getIntegerTypeSourceInfo())
220    Writer.AddTypeRef(D->getIntegerType(), Record);
221  Writer.AddTypeRef(D->getPromotionType(), Record);
222  Record.push_back(D->getNumPositiveBits());
223  Record.push_back(D->getNumNegativeBits());
224  Record.push_back(D->isScoped());
225  Record.push_back(D->isScopedUsingClassTag());
226  Record.push_back(D->isFixed());
227  Writer.AddDeclRef(D->getInstantiatedFromMemberEnum(), Record);
228
229  if (!D->hasAttrs() &&
230      !D->isImplicit() &&
231      !D->isUsed(false) &&
232      !D->hasExtInfo() &&
233      D->RedeclLink.getNext() == D &&
234      !D->isInvalidDecl() &&
235      !D->isReferenced() &&
236      D->getAccess() == AS_none &&
237      !D->isModulePrivate() &&
238      !CXXRecordDecl::classofKind(D->getKind()) &&
239      !D->getIntegerTypeSourceInfo() &&
240      D->getDeclName().getNameKind() == DeclarationName::Identifier)
241    AbbrevToUse = Writer.getDeclEnumAbbrev();
242
243  Code = serialization::DECL_ENUM;
244}
245
246void ASTDeclWriter::VisitRecordDecl(RecordDecl *D) {
247  VisitTagDecl(D);
248  Record.push_back(D->hasFlexibleArrayMember());
249  Record.push_back(D->isAnonymousStructOrUnion());
250  Record.push_back(D->hasObjectMember());
251
252  if (!D->hasAttrs() &&
253      !D->isImplicit() &&
254      !D->isUsed(false) &&
255      !D->hasExtInfo() &&
256      D->RedeclLink.getNext() == D &&
257      !D->isInvalidDecl() &&
258      !D->isReferenced() &&
259      D->getAccess() == AS_none &&
260      !D->isModulePrivate() &&
261      !CXXRecordDecl::classofKind(D->getKind()) &&
262      D->getDeclName().getNameKind() == DeclarationName::Identifier)
263    AbbrevToUse = Writer.getDeclRecordAbbrev();
264
265  Code = serialization::DECL_RECORD;
266}
267
268void ASTDeclWriter::VisitValueDecl(ValueDecl *D) {
269  VisitNamedDecl(D);
270  Writer.AddTypeRef(D->getType(), Record);
271}
272
273void ASTDeclWriter::VisitEnumConstantDecl(EnumConstantDecl *D) {
274  VisitValueDecl(D);
275  Record.push_back(D->getInitExpr()? 1 : 0);
276  if (D->getInitExpr())
277    Writer.AddStmt(D->getInitExpr());
278  Writer.AddAPSInt(D->getInitVal(), Record);
279
280  Code = serialization::DECL_ENUM_CONSTANT;
281}
282
283void ASTDeclWriter::VisitDeclaratorDecl(DeclaratorDecl *D) {
284  VisitValueDecl(D);
285  Writer.AddSourceLocation(D->getInnerLocStart(), Record);
286  Record.push_back(D->hasExtInfo());
287  if (D->hasExtInfo())
288    Writer.AddQualifierInfo(*D->getExtInfo(), Record);
289}
290
291void ASTDeclWriter::VisitFunctionDecl(FunctionDecl *D) {
292  VisitRedeclarable(D);
293  VisitDeclaratorDecl(D);
294
295  Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
296  Record.push_back(D->getIdentifierNamespace());
297  Record.push_back(D->getTemplatedKind());
298  switch (D->getTemplatedKind()) {
299  default: llvm_unreachable("Unhandled TemplatedKind!");
300  case FunctionDecl::TK_NonTemplate:
301    break;
302  case FunctionDecl::TK_FunctionTemplate:
303    Writer.AddDeclRef(D->getDescribedFunctionTemplate(), Record);
304    break;
305  case FunctionDecl::TK_MemberSpecialization: {
306    MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo();
307    Writer.AddDeclRef(MemberInfo->getInstantiatedFrom(), Record);
308    Record.push_back(MemberInfo->getTemplateSpecializationKind());
309    Writer.AddSourceLocation(MemberInfo->getPointOfInstantiation(), Record);
310    break;
311  }
312  case FunctionDecl::TK_FunctionTemplateSpecialization: {
313    FunctionTemplateSpecializationInfo *
314      FTSInfo = D->getTemplateSpecializationInfo();
315    Writer.AddDeclRef(FTSInfo->getTemplate(), Record);
316    Record.push_back(FTSInfo->getTemplateSpecializationKind());
317
318    // Template arguments.
319    Writer.AddTemplateArgumentList(FTSInfo->TemplateArguments, Record);
320
321    // Template args as written.
322    Record.push_back(FTSInfo->TemplateArgumentsAsWritten != 0);
323    if (FTSInfo->TemplateArgumentsAsWritten) {
324      Record.push_back(FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs);
325      for (int i=0, e = FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs;
326             i!=e; ++i)
327        Writer.AddTemplateArgumentLoc((*FTSInfo->TemplateArgumentsAsWritten)[i],
328                                      Record);
329      Writer.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->LAngleLoc,
330                               Record);
331      Writer.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->RAngleLoc,
332                               Record);
333    }
334
335    Writer.AddSourceLocation(FTSInfo->getPointOfInstantiation(), Record);
336
337    if (D->isCanonicalDecl()) {
338      // Write the template that contains the specializations set. We will
339      // add a FunctionTemplateSpecializationInfo to it when reading.
340      Writer.AddDeclRef(FTSInfo->getTemplate()->getCanonicalDecl(), Record);
341    }
342    break;
343  }
344  case FunctionDecl::TK_DependentFunctionTemplateSpecialization: {
345    DependentFunctionTemplateSpecializationInfo *
346      DFTSInfo = D->getDependentSpecializationInfo();
347
348    // Templates.
349    Record.push_back(DFTSInfo->getNumTemplates());
350    for (int i=0, e = DFTSInfo->getNumTemplates(); i != e; ++i)
351      Writer.AddDeclRef(DFTSInfo->getTemplate(i), Record);
352
353    // Templates args.
354    Record.push_back(DFTSInfo->getNumTemplateArgs());
355    for (int i=0, e = DFTSInfo->getNumTemplateArgs(); i != e; ++i)
356      Writer.AddTemplateArgumentLoc(DFTSInfo->getTemplateArg(i), Record);
357    Writer.AddSourceLocation(DFTSInfo->getLAngleLoc(), Record);
358    Writer.AddSourceLocation(DFTSInfo->getRAngleLoc(), Record);
359    break;
360  }
361  }
362
363  // FunctionDecl's body is handled last at ASTWriterDecl::Visit,
364  // after everything else is written.
365
366  Record.push_back(D->getStorageClass()); // FIXME: stable encoding
367  Record.push_back(D->getStorageClassAsWritten());
368  Record.push_back(D->IsInline);
369  Record.push_back(D->isInlineSpecified());
370  Record.push_back(D->isVirtualAsWritten());
371  Record.push_back(D->isPure());
372  Record.push_back(D->hasInheritedPrototype());
373  Record.push_back(D->hasWrittenPrototype());
374  Record.push_back(D->isDeletedAsWritten());
375  Record.push_back(D->isTrivial());
376  Record.push_back(D->isDefaulted());
377  Record.push_back(D->isExplicitlyDefaulted());
378  Record.push_back(D->hasImplicitReturnZero());
379  Record.push_back(D->isConstexpr());
380  Writer.AddSourceLocation(D->getLocEnd(), Record);
381
382  Record.push_back(D->param_size());
383  for (FunctionDecl::param_iterator P = D->param_begin(), PEnd = D->param_end();
384       P != PEnd; ++P)
385    Writer.AddDeclRef(*P, Record);
386  Code = serialization::DECL_FUNCTION;
387}
388
389void ASTDeclWriter::VisitObjCMethodDecl(ObjCMethodDecl *D) {
390  VisitNamedDecl(D);
391  // FIXME: convert to LazyStmtPtr?
392  // Unlike C/C++, method bodies will never be in header files.
393  bool HasBodyStuff = D->getBody() != 0     ||
394                      D->getSelfDecl() != 0 || D->getCmdDecl() != 0;
395  Record.push_back(HasBodyStuff);
396  if (HasBodyStuff) {
397    Writer.AddStmt(D->getBody());
398    Writer.AddDeclRef(D->getSelfDecl(), Record);
399    Writer.AddDeclRef(D->getCmdDecl(), Record);
400  }
401  Record.push_back(D->isInstanceMethod());
402  Record.push_back(D->isVariadic());
403  Record.push_back(D->isSynthesized());
404  Record.push_back(D->isDefined());
405
406  Record.push_back(D->IsRedeclaration);
407  Record.push_back(D->HasRedeclaration);
408  if (D->HasRedeclaration) {
409    assert(Context.getObjCMethodRedeclaration(D));
410    Writer.AddDeclRef(Context.getObjCMethodRedeclaration(D), Record);
411  }
412
413  // FIXME: stable encoding for @required/@optional
414  Record.push_back(D->getImplementationControl());
415  // FIXME: stable encoding for in/out/inout/bycopy/byref/oneway
416  Record.push_back(D->getObjCDeclQualifier());
417  Record.push_back(D->hasRelatedResultType());
418  Writer.AddTypeRef(D->getResultType(), Record);
419  Writer.AddTypeSourceInfo(D->getResultTypeSourceInfo(), Record);
420  Writer.AddSourceLocation(D->getLocEnd(), Record);
421  Record.push_back(D->param_size());
422  for (ObjCMethodDecl::param_iterator P = D->param_begin(),
423                                   PEnd = D->param_end(); P != PEnd; ++P)
424    Writer.AddDeclRef(*P, Record);
425
426  Record.push_back(D->SelLocsKind);
427  unsigned NumStoredSelLocs = D->getNumStoredSelLocs();
428  SourceLocation *SelLocs = D->getStoredSelLocs();
429  Record.push_back(NumStoredSelLocs);
430  for (unsigned i = 0; i != NumStoredSelLocs; ++i)
431    Writer.AddSourceLocation(SelLocs[i], Record);
432
433  Code = serialization::DECL_OBJC_METHOD;
434}
435
436void ASTDeclWriter::VisitObjCContainerDecl(ObjCContainerDecl *D) {
437  VisitNamedDecl(D);
438  Writer.AddSourceLocation(D->getAtStartLoc(), Record);
439  Writer.AddSourceRange(D->getAtEndRange(), Record);
440  // Abstract class (no need to define a stable serialization::DECL code).
441}
442
443void ASTDeclWriter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *D) {
444  VisitObjCContainerDecl(D);
445  Writer.AddTypeRef(QualType(D->getTypeForDecl(), 0), Record);
446  Writer.AddDeclRef(D->getSuperClass(), Record);
447
448  // Write out the protocols that are directly referenced by the @interface.
449  Record.push_back(D->ReferencedProtocols.size());
450  for (ObjCInterfaceDecl::protocol_iterator P = D->protocol_begin(),
451         PEnd = D->protocol_end();
452       P != PEnd; ++P)
453    Writer.AddDeclRef(*P, Record);
454  for (ObjCInterfaceDecl::protocol_loc_iterator PL = D->protocol_loc_begin(),
455         PLEnd = D->protocol_loc_end();
456       PL != PLEnd; ++PL)
457    Writer.AddSourceLocation(*PL, Record);
458
459  // Write out the protocols that are transitively referenced.
460  Record.push_back(D->AllReferencedProtocols.size());
461  for (ObjCList<ObjCProtocolDecl>::iterator
462        P = D->AllReferencedProtocols.begin(),
463        PEnd = D->AllReferencedProtocols.end();
464       P != PEnd; ++P)
465    Writer.AddDeclRef(*P, Record);
466
467  // Write out the ivars.
468  Record.push_back(D->ivar_size());
469  for (ObjCInterfaceDecl::ivar_iterator I = D->ivar_begin(),
470                                     IEnd = D->ivar_end(); I != IEnd; ++I)
471    Writer.AddDeclRef(*I, Record);
472  Writer.AddDeclRef(D->getCategoryList(), Record);
473  Record.push_back(D->isInitiallyForwardDecl());
474  Record.push_back(D->isForwardDecl());
475  Record.push_back(D->isImplicitInterfaceDecl());
476  Writer.AddSourceLocation(D->getSuperClassLoc(), Record);
477  Writer.AddSourceLocation(D->getLocEnd(), Record);
478  Code = serialization::DECL_OBJC_INTERFACE;
479}
480
481void ASTDeclWriter::VisitObjCIvarDecl(ObjCIvarDecl *D) {
482  VisitFieldDecl(D);
483  // FIXME: stable encoding for @public/@private/@protected/@package
484  Record.push_back(D->getAccessControl());
485  Record.push_back(D->getSynthesize());
486
487  if (!D->hasAttrs() &&
488      !D->isImplicit() &&
489      !D->isUsed(false) &&
490      !D->isInvalidDecl() &&
491      !D->isReferenced() &&
492      !D->isModulePrivate() &&
493      !D->getBitWidth() &&
494      !D->hasExtInfo() &&
495      D->getDeclName())
496    AbbrevToUse = Writer.getDeclObjCIvarAbbrev();
497
498  Code = serialization::DECL_OBJC_IVAR;
499}
500
501void ASTDeclWriter::VisitObjCProtocolDecl(ObjCProtocolDecl *D) {
502  VisitObjCContainerDecl(D);
503  Record.push_back(D->isInitiallyForwardDecl());
504  Record.push_back(D->isForwardDecl());
505  Writer.AddSourceLocation(D->getLocEnd(), Record);
506  Record.push_back(D->protocol_size());
507  for (ObjCProtocolDecl::protocol_iterator
508       I = D->protocol_begin(), IEnd = D->protocol_end(); I != IEnd; ++I)
509    Writer.AddDeclRef(*I, Record);
510  for (ObjCProtocolDecl::protocol_loc_iterator PL = D->protocol_loc_begin(),
511         PLEnd = D->protocol_loc_end();
512       PL != PLEnd; ++PL)
513    Writer.AddSourceLocation(*PL, Record);
514  Code = serialization::DECL_OBJC_PROTOCOL;
515}
516
517void ASTDeclWriter::VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D) {
518  VisitFieldDecl(D);
519  Code = serialization::DECL_OBJC_AT_DEFS_FIELD;
520}
521
522void ASTDeclWriter::VisitObjCClassDecl(ObjCClassDecl *D) {
523  VisitDecl(D);
524  Writer.AddDeclRef(D->getForwardInterfaceDecl(), Record);
525  Writer.AddSourceLocation(D->getForwardDecl()->getLocation(), Record);
526  Code = serialization::DECL_OBJC_CLASS;
527}
528
529void ASTDeclWriter::VisitObjCForwardProtocolDecl(ObjCForwardProtocolDecl *D) {
530  VisitDecl(D);
531  Record.push_back(D->protocol_size());
532  for (ObjCForwardProtocolDecl::protocol_iterator
533       I = D->protocol_begin(), IEnd = D->protocol_end(); I != IEnd; ++I)
534    Writer.AddDeclRef(*I, Record);
535  for (ObjCForwardProtocolDecl::protocol_loc_iterator
536         PL = D->protocol_loc_begin(), PLEnd = D->protocol_loc_end();
537       PL != PLEnd; ++PL)
538    Writer.AddSourceLocation(*PL, Record);
539  Code = serialization::DECL_OBJC_FORWARD_PROTOCOL;
540}
541
542void ASTDeclWriter::VisitObjCCategoryDecl(ObjCCategoryDecl *D) {
543  VisitObjCContainerDecl(D);
544  Writer.AddDeclRef(D->getClassInterface(), Record);
545  Record.push_back(D->protocol_size());
546  for (ObjCCategoryDecl::protocol_iterator
547       I = D->protocol_begin(), IEnd = D->protocol_end(); I != IEnd; ++I)
548    Writer.AddDeclRef(*I, Record);
549  for (ObjCCategoryDecl::protocol_loc_iterator
550         PL = D->protocol_loc_begin(), PLEnd = D->protocol_loc_end();
551       PL != PLEnd; ++PL)
552    Writer.AddSourceLocation(*PL, Record);
553  Writer.AddDeclRef(D->getNextClassCategory(), Record);
554  Record.push_back(D->hasSynthBitfield());
555  Writer.AddSourceLocation(D->getCategoryNameLoc(), Record);
556  Code = serialization::DECL_OBJC_CATEGORY;
557}
558
559void ASTDeclWriter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D) {
560  VisitNamedDecl(D);
561  Writer.AddDeclRef(D->getClassInterface(), Record);
562  Code = serialization::DECL_OBJC_COMPATIBLE_ALIAS;
563}
564
565void ASTDeclWriter::VisitObjCPropertyDecl(ObjCPropertyDecl *D) {
566  VisitNamedDecl(D);
567  Writer.AddSourceLocation(D->getAtLoc(), Record);
568  Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record);
569  // FIXME: stable encoding
570  Record.push_back((unsigned)D->getPropertyAttributes());
571  Record.push_back((unsigned)D->getPropertyAttributesAsWritten());
572  // FIXME: stable encoding
573  Record.push_back((unsigned)D->getPropertyImplementation());
574  Writer.AddDeclarationName(D->getGetterName(), Record);
575  Writer.AddDeclarationName(D->getSetterName(), Record);
576  Writer.AddDeclRef(D->getGetterMethodDecl(), Record);
577  Writer.AddDeclRef(D->getSetterMethodDecl(), Record);
578  Writer.AddDeclRef(D->getPropertyIvarDecl(), Record);
579  Code = serialization::DECL_OBJC_PROPERTY;
580}
581
582void ASTDeclWriter::VisitObjCImplDecl(ObjCImplDecl *D) {
583  VisitObjCContainerDecl(D);
584  Writer.AddDeclRef(D->getClassInterface(), Record);
585  // Abstract class (no need to define a stable serialization::DECL code).
586}
587
588void ASTDeclWriter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D) {
589  VisitObjCImplDecl(D);
590  Writer.AddIdentifierRef(D->getIdentifier(), Record);
591  Code = serialization::DECL_OBJC_CATEGORY_IMPL;
592}
593
594void ASTDeclWriter::VisitObjCImplementationDecl(ObjCImplementationDecl *D) {
595  VisitObjCImplDecl(D);
596  Writer.AddDeclRef(D->getSuperClass(), Record);
597  Writer.AddCXXCtorInitializers(D->IvarInitializers, D->NumIvarInitializers,
598                                Record);
599  Record.push_back(D->hasSynthBitfield());
600  Code = serialization::DECL_OBJC_IMPLEMENTATION;
601}
602
603void ASTDeclWriter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D) {
604  VisitDecl(D);
605  Writer.AddSourceLocation(D->getLocStart(), Record);
606  Writer.AddDeclRef(D->getPropertyDecl(), Record);
607  Writer.AddDeclRef(D->getPropertyIvarDecl(), Record);
608  Writer.AddSourceLocation(D->getPropertyIvarDeclLoc(), Record);
609  Writer.AddStmt(D->getGetterCXXConstructor());
610  Writer.AddStmt(D->getSetterCXXAssignment());
611  Code = serialization::DECL_OBJC_PROPERTY_IMPL;
612}
613
614void ASTDeclWriter::VisitFieldDecl(FieldDecl *D) {
615  VisitDeclaratorDecl(D);
616  Record.push_back(D->isMutable());
617  Record.push_back(D->getBitWidth()? 1 : D->hasInClassInitializer() ? 2 : 0);
618  if (D->getBitWidth())
619    Writer.AddStmt(D->getBitWidth());
620  else if (D->hasInClassInitializer())
621    Writer.AddStmt(D->getInClassInitializer());
622  if (!D->getDeclName())
623    Writer.AddDeclRef(Context.getInstantiatedFromUnnamedFieldDecl(D), Record);
624
625  if (!D->hasAttrs() &&
626      !D->isImplicit() &&
627      !D->isUsed(false) &&
628      !D->isInvalidDecl() &&
629      !D->isReferenced() &&
630      !D->isModulePrivate() &&
631      !D->getBitWidth() &&
632      !D->hasInClassInitializer() &&
633      !D->hasExtInfo() &&
634      !ObjCIvarDecl::classofKind(D->getKind()) &&
635      !ObjCAtDefsFieldDecl::classofKind(D->getKind()) &&
636      D->getDeclName())
637    AbbrevToUse = Writer.getDeclFieldAbbrev();
638
639  Code = serialization::DECL_FIELD;
640}
641
642void ASTDeclWriter::VisitIndirectFieldDecl(IndirectFieldDecl *D) {
643  VisitValueDecl(D);
644  Record.push_back(D->getChainingSize());
645
646  for (IndirectFieldDecl::chain_iterator
647       P = D->chain_begin(),
648       PEnd = D->chain_end(); P != PEnd; ++P)
649    Writer.AddDeclRef(*P, Record);
650  Code = serialization::DECL_INDIRECTFIELD;
651}
652
653void ASTDeclWriter::VisitVarDecl(VarDecl *D) {
654  VisitRedeclarable(D);
655  VisitDeclaratorDecl(D);
656  Record.push_back(D->getStorageClass()); // FIXME: stable encoding
657  Record.push_back(D->getStorageClassAsWritten());
658  Record.push_back(D->isThreadSpecified());
659  Record.push_back(D->hasCXXDirectInitializer());
660  Record.push_back(D->isExceptionVariable());
661  Record.push_back(D->isNRVOVariable());
662  Record.push_back(D->isCXXForRangeDecl());
663  Record.push_back(D->isARCPseudoStrong());
664  Record.push_back(D->getInit() ? 1 : 0);
665  if (D->getInit())
666    Writer.AddStmt(D->getInit());
667
668  MemberSpecializationInfo *SpecInfo
669    = D->isStaticDataMember() ? D->getMemberSpecializationInfo() : 0;
670  Record.push_back(SpecInfo != 0);
671  if (SpecInfo) {
672    Writer.AddDeclRef(SpecInfo->getInstantiatedFrom(), Record);
673    Record.push_back(SpecInfo->getTemplateSpecializationKind());
674    Writer.AddSourceLocation(SpecInfo->getPointOfInstantiation(), Record);
675  }
676
677  if (!D->hasAttrs() &&
678      !D->isImplicit() &&
679      !D->isUsed(false) &&
680      !D->isInvalidDecl() &&
681      !D->isReferenced() &&
682      D->getAccess() == AS_none &&
683      !D->isModulePrivate() &&
684      D->getDeclName().getNameKind() == DeclarationName::Identifier &&
685      !D->hasExtInfo() &&
686      D->RedeclLink.getNext() == D &&
687      !D->hasCXXDirectInitializer() &&
688      D->getInit() == 0 &&
689      !isa<ParmVarDecl>(D) &&
690      !SpecInfo)
691    AbbrevToUse = Writer.getDeclVarAbbrev();
692
693  Code = serialization::DECL_VAR;
694}
695
696void ASTDeclWriter::VisitImplicitParamDecl(ImplicitParamDecl *D) {
697  VisitVarDecl(D);
698  Code = serialization::DECL_IMPLICIT_PARAM;
699}
700
701void ASTDeclWriter::VisitParmVarDecl(ParmVarDecl *D) {
702  VisitVarDecl(D);
703  Record.push_back(D->isObjCMethodParameter());
704  Record.push_back(D->getFunctionScopeDepth());
705  Record.push_back(D->getFunctionScopeIndex());
706  Record.push_back(D->getObjCDeclQualifier()); // FIXME: stable encoding
707  Record.push_back(D->isKNRPromoted());
708  Record.push_back(D->hasInheritedDefaultArg());
709  Record.push_back(D->hasUninstantiatedDefaultArg());
710  if (D->hasUninstantiatedDefaultArg())
711    Writer.AddStmt(D->getUninstantiatedDefaultArg());
712  Code = serialization::DECL_PARM_VAR;
713
714  assert(!D->isARCPseudoStrong()); // can be true of ImplicitParamDecl
715
716  // If the assumptions about the DECL_PARM_VAR abbrev are true, use it.  Here
717  // we dynamically check for the properties that we optimize for, but don't
718  // know are true of all PARM_VAR_DECLs.
719  if (!D->hasAttrs() &&
720      !D->hasExtInfo() &&
721      !D->isImplicit() &&
722      !D->isUsed(false) &&
723      D->getAccess() == AS_none &&
724      !D->isModulePrivate() &&
725      D->getStorageClass() == 0 &&
726      !D->hasCXXDirectInitializer() && // Can params have this ever?
727      D->getFunctionScopeDepth() == 0 &&
728      D->getObjCDeclQualifier() == 0 &&
729      !D->isKNRPromoted() &&
730      !D->hasInheritedDefaultArg() &&
731      D->getInit() == 0 &&
732      !D->hasUninstantiatedDefaultArg())  // No default expr.
733    AbbrevToUse = Writer.getDeclParmVarAbbrev();
734
735  // Check things we know are true of *every* PARM_VAR_DECL, which is more than
736  // just us assuming it.
737  assert(!D->isInvalidDecl() && "Shouldn't emit invalid decls");
738  assert(!D->isThreadSpecified() && "PARM_VAR_DECL can't be __thread");
739  assert(D->getAccess() == AS_none && "PARM_VAR_DECL can't be public/private");
740  assert(!D->isExceptionVariable() && "PARM_VAR_DECL can't be exception var");
741  assert(D->getPreviousDeclaration() == 0 && "PARM_VAR_DECL can't be redecl");
742  assert(!D->isStaticDataMember() &&
743         "PARM_VAR_DECL can't be static data member");
744}
745
746void ASTDeclWriter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
747  VisitDecl(D);
748  Writer.AddStmt(D->getAsmString());
749  Writer.AddSourceLocation(D->getRParenLoc(), Record);
750  Code = serialization::DECL_FILE_SCOPE_ASM;
751}
752
753void ASTDeclWriter::VisitBlockDecl(BlockDecl *D) {
754  VisitDecl(D);
755  Writer.AddStmt(D->getBody());
756  Writer.AddTypeSourceInfo(D->getSignatureAsWritten(), Record);
757  Record.push_back(D->param_size());
758  for (FunctionDecl::param_iterator P = D->param_begin(), PEnd = D->param_end();
759       P != PEnd; ++P)
760    Writer.AddDeclRef(*P, Record);
761  Record.push_back(D->capturesCXXThis());
762  Record.push_back(D->getNumCaptures());
763  for (BlockDecl::capture_iterator
764         i = D->capture_begin(), e = D->capture_end(); i != e; ++i) {
765    const BlockDecl::Capture &capture = *i;
766    Writer.AddDeclRef(capture.getVariable(), Record);
767
768    unsigned flags = 0;
769    if (capture.isByRef()) flags |= 1;
770    if (capture.isNested()) flags |= 2;
771    if (capture.hasCopyExpr()) flags |= 4;
772    Record.push_back(flags);
773
774    if (capture.hasCopyExpr()) Writer.AddStmt(capture.getCopyExpr());
775  }
776
777  Code = serialization::DECL_BLOCK;
778}
779
780void ASTDeclWriter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
781  VisitDecl(D);
782  Record.push_back(D->getLanguage());
783  Writer.AddSourceLocation(D->getExternLoc(), Record);
784  Writer.AddSourceLocation(D->getRBraceLoc(), Record);
785  Code = serialization::DECL_LINKAGE_SPEC;
786}
787
788void ASTDeclWriter::VisitLabelDecl(LabelDecl *D) {
789  VisitNamedDecl(D);
790  Writer.AddSourceLocation(D->getLocStart(), Record);
791  Code = serialization::DECL_LABEL;
792}
793
794
795void ASTDeclWriter::VisitNamespaceDecl(NamespaceDecl *D) {
796  VisitNamedDecl(D);
797  Record.push_back(D->isInline());
798  Writer.AddSourceLocation(D->getLocStart(), Record);
799  Writer.AddSourceLocation(D->getRBraceLoc(), Record);
800  Writer.AddDeclRef(D->getNextNamespace(), Record);
801
802  // Only write one reference--original or anonymous
803  Record.push_back(D->isOriginalNamespace());
804  if (D->isOriginalNamespace())
805    Writer.AddDeclRef(D->getAnonymousNamespace(), Record);
806  else
807    Writer.AddDeclRef(D->getOriginalNamespace(), Record);
808  Code = serialization::DECL_NAMESPACE;
809
810  if (Writer.hasChain() && !D->isOriginalNamespace() &&
811      D->getOriginalNamespace()->isFromASTFile()) {
812    NamespaceDecl *NS = D->getOriginalNamespace();
813    Writer.AddUpdatedDeclContext(NS);
814
815    // Make sure all visible decls are written. They will be recorded later.
816    NS->lookup(DeclarationName());
817    StoredDeclsMap *Map = static_cast<StoredDeclsMap*>(NS->getLookupPtr());
818    if (Map) {
819      for (StoredDeclsMap::iterator D = Map->begin(), DEnd = Map->end();
820           D != DEnd; ++D) {
821        DeclContext::lookup_result Result = D->second.getLookupResult();
822        while (Result.first != Result.second) {
823          Writer.GetDeclRef(*Result.first);
824          ++Result.first;
825        }
826      }
827    }
828  }
829
830  if (Writer.hasChain() && D->isAnonymousNamespace() && !D->getNextNamespace()){
831    // This is a most recent reopening of the anonymous namespace. If its parent
832    // is in a previous PCH (or is the TU), mark that parent for update, because
833    // the original namespace always points to the latest re-opening of its
834    // anonymous namespace.
835    Decl *Parent = cast<Decl>(
836        D->getParent()->getRedeclContext()->getPrimaryContext());
837    if (Parent->isFromASTFile() || isa<TranslationUnitDecl>(Parent)) {
838      ASTWriter::UpdateRecord &Record = Writer.DeclUpdates[Parent];
839      Record.push_back(UPD_CXX_ADDED_ANONYMOUS_NAMESPACE);
840      Writer.AddDeclRef(D, Record);
841    }
842  }
843}
844
845void ASTDeclWriter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
846  VisitNamedDecl(D);
847  Writer.AddSourceLocation(D->getNamespaceLoc(), Record);
848  Writer.AddSourceLocation(D->getTargetNameLoc(), Record);
849  Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
850  Writer.AddDeclRef(D->getNamespace(), Record);
851  Code = serialization::DECL_NAMESPACE_ALIAS;
852}
853
854void ASTDeclWriter::VisitUsingDecl(UsingDecl *D) {
855  VisitNamedDecl(D);
856  Writer.AddSourceLocation(D->getUsingLocation(), Record);
857  Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
858  Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
859  Writer.AddDeclRef(D->FirstUsingShadow, Record);
860  Record.push_back(D->isTypeName());
861  Writer.AddDeclRef(Context.getInstantiatedFromUsingDecl(D), Record);
862  Code = serialization::DECL_USING;
863}
864
865void ASTDeclWriter::VisitUsingShadowDecl(UsingShadowDecl *D) {
866  VisitNamedDecl(D);
867  Writer.AddDeclRef(D->getTargetDecl(), Record);
868  Writer.AddDeclRef(D->UsingOrNextShadow, Record);
869  Writer.AddDeclRef(Context.getInstantiatedFromUsingShadowDecl(D), Record);
870  Code = serialization::DECL_USING_SHADOW;
871}
872
873void ASTDeclWriter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
874  VisitNamedDecl(D);
875  Writer.AddSourceLocation(D->getUsingLoc(), Record);
876  Writer.AddSourceLocation(D->getNamespaceKeyLocation(), Record);
877  Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
878  Writer.AddDeclRef(D->getNominatedNamespace(), Record);
879  Writer.AddDeclRef(dyn_cast<Decl>(D->getCommonAncestor()), Record);
880  Code = serialization::DECL_USING_DIRECTIVE;
881}
882
883void ASTDeclWriter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
884  VisitValueDecl(D);
885  Writer.AddSourceLocation(D->getUsingLoc(), Record);
886  Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
887  Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
888  Code = serialization::DECL_UNRESOLVED_USING_VALUE;
889}
890
891void ASTDeclWriter::VisitUnresolvedUsingTypenameDecl(
892                                               UnresolvedUsingTypenameDecl *D) {
893  VisitTypeDecl(D);
894  Writer.AddSourceLocation(D->getTypenameLoc(), Record);
895  Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
896  Code = serialization::DECL_UNRESOLVED_USING_TYPENAME;
897}
898
899void ASTDeclWriter::VisitCXXRecordDecl(CXXRecordDecl *D) {
900  VisitRecordDecl(D);
901
902  CXXRecordDecl *DefinitionDecl = 0;
903  if (D->DefinitionData)
904    DefinitionDecl = D->DefinitionData->Definition;
905  Writer.AddDeclRef(DefinitionDecl, Record);
906  if (D == DefinitionDecl)
907    Writer.AddCXXDefinitionData(D, Record);
908
909  enum {
910    CXXRecNotTemplate = 0, CXXRecTemplate, CXXRecMemberSpecialization
911  };
912  if (ClassTemplateDecl *TemplD = D->getDescribedClassTemplate()) {
913    Record.push_back(CXXRecTemplate);
914    Writer.AddDeclRef(TemplD, Record);
915  } else if (MemberSpecializationInfo *MSInfo
916               = D->getMemberSpecializationInfo()) {
917    Record.push_back(CXXRecMemberSpecialization);
918    Writer.AddDeclRef(MSInfo->getInstantiatedFrom(), Record);
919    Record.push_back(MSInfo->getTemplateSpecializationKind());
920    Writer.AddSourceLocation(MSInfo->getPointOfInstantiation(), Record);
921  } else {
922    Record.push_back(CXXRecNotTemplate);
923  }
924
925  // Store the key function to avoid deserializing every method so we can
926  // compute it.
927  if (D->IsCompleteDefinition)
928    Writer.AddDeclRef(Context.getKeyFunction(D), Record);
929
930  Code = serialization::DECL_CXX_RECORD;
931}
932
933void ASTDeclWriter::VisitCXXMethodDecl(CXXMethodDecl *D) {
934  VisitFunctionDecl(D);
935  Record.push_back(D->size_overridden_methods());
936  for (CXXMethodDecl::method_iterator
937         I = D->begin_overridden_methods(), E = D->end_overridden_methods();
938         I != E; ++I)
939    Writer.AddDeclRef(*I, Record);
940  Code = serialization::DECL_CXX_METHOD;
941}
942
943void ASTDeclWriter::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
944  VisitCXXMethodDecl(D);
945
946  Record.push_back(D->IsExplicitSpecified);
947  Record.push_back(D->ImplicitlyDefined);
948  Writer.AddCXXCtorInitializers(D->CtorInitializers, D->NumCtorInitializers,
949                                Record);
950
951  Code = serialization::DECL_CXX_CONSTRUCTOR;
952}
953
954void ASTDeclWriter::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
955  VisitCXXMethodDecl(D);
956
957  Record.push_back(D->ImplicitlyDefined);
958  Writer.AddDeclRef(D->OperatorDelete, Record);
959
960  Code = serialization::DECL_CXX_DESTRUCTOR;
961}
962
963void ASTDeclWriter::VisitCXXConversionDecl(CXXConversionDecl *D) {
964  VisitCXXMethodDecl(D);
965  Record.push_back(D->IsExplicitSpecified);
966  Code = serialization::DECL_CXX_CONVERSION;
967}
968
969void ASTDeclWriter::VisitAccessSpecDecl(AccessSpecDecl *D) {
970  VisitDecl(D);
971  Writer.AddSourceLocation(D->getColonLoc(), Record);
972  Code = serialization::DECL_ACCESS_SPEC;
973}
974
975void ASTDeclWriter::VisitFriendDecl(FriendDecl *D) {
976  VisitDecl(D);
977  Record.push_back(D->Friend.is<TypeSourceInfo*>());
978  if (D->Friend.is<TypeSourceInfo*>())
979    Writer.AddTypeSourceInfo(D->Friend.get<TypeSourceInfo*>(), Record);
980  else
981    Writer.AddDeclRef(D->Friend.get<NamedDecl*>(), Record);
982  Writer.AddDeclRef(D->getNextFriend(), Record);
983  Record.push_back(D->UnsupportedFriend);
984  Writer.AddSourceLocation(D->FriendLoc, Record);
985  Code = serialization::DECL_FRIEND;
986}
987
988void ASTDeclWriter::VisitFriendTemplateDecl(FriendTemplateDecl *D) {
989  VisitDecl(D);
990  Record.push_back(D->getNumTemplateParameters());
991  for (unsigned i = 0, e = D->getNumTemplateParameters(); i != e; ++i)
992    Writer.AddTemplateParameterList(D->getTemplateParameterList(i), Record);
993  Record.push_back(D->getFriendDecl() != 0);
994  if (D->getFriendDecl())
995    Writer.AddDeclRef(D->getFriendDecl(), Record);
996  else
997    Writer.AddTypeSourceInfo(D->getFriendType(), Record);
998  Writer.AddSourceLocation(D->getFriendLoc(), Record);
999  Code = serialization::DECL_FRIEND_TEMPLATE;
1000}
1001
1002void ASTDeclWriter::VisitTemplateDecl(TemplateDecl *D) {
1003  VisitNamedDecl(D);
1004
1005  Writer.AddDeclRef(D->getTemplatedDecl(), Record);
1006  Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1007}
1008
1009void ASTDeclWriter::VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D) {
1010  // Emit data to initialize CommonOrPrev before VisitTemplateDecl so that
1011  // getCommonPtr() can be used while this is still initializing.
1012
1013  Writer.AddDeclRef(D->getPreviousDeclaration(), Record);
1014  if (D->getPreviousDeclaration())
1015    Writer.AddDeclRef(D->getFirstDeclaration(), Record);
1016
1017  if (D->getPreviousDeclaration() == 0) {
1018    // This TemplateDecl owns the CommonPtr; write it.
1019    assert(D->isCanonicalDecl());
1020
1021    Writer.AddDeclRef(D->getInstantiatedFromMemberTemplate(), Record);
1022    if (D->getInstantiatedFromMemberTemplate())
1023      Record.push_back(D->isMemberSpecialization());
1024
1025    Writer.AddDeclRef(D->getCommonPtr()->Latest, Record);
1026  } else {
1027    RedeclarableTemplateDecl *First = D->getFirstDeclaration();
1028    assert(First != D);
1029    // If this is a most recent redeclaration that is pointed to by a first decl
1030    // in a chained PCH, keep track of the association with the map so we can
1031    // update the first decl during AST reading.
1032    if (First->getMostRecentDeclaration() == D &&
1033        First->isFromASTFile() && !D->isFromASTFile()) {
1034      assert(Writer.FirstLatestDecls.find(First)==Writer.FirstLatestDecls.end()
1035             && "The latest is already set");
1036      Writer.FirstLatestDecls[First] = D;
1037    }
1038  }
1039
1040  VisitTemplateDecl(D);
1041  Record.push_back(D->getIdentifierNamespace());
1042}
1043
1044void ASTDeclWriter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1045  VisitRedeclarableTemplateDecl(D);
1046
1047  if (D->getPreviousDeclaration() == 0) {
1048    typedef llvm::FoldingSet<ClassTemplateSpecializationDecl> CTSDSetTy;
1049    CTSDSetTy &CTSDSet = D->getSpecializations();
1050    Record.push_back(CTSDSet.size());
1051    for (CTSDSetTy::iterator I=CTSDSet.begin(), E = CTSDSet.end(); I!=E; ++I) {
1052      assert(I->isCanonicalDecl() && "Expected only canonical decls in set");
1053      Writer.AddDeclRef(&*I, Record);
1054    }
1055
1056    typedef llvm::FoldingSet<ClassTemplatePartialSpecializationDecl> CTPSDSetTy;
1057    CTPSDSetTy &CTPSDSet = D->getPartialSpecializations();
1058    Record.push_back(CTPSDSet.size());
1059    for (CTPSDSetTy::iterator I=CTPSDSet.begin(), E=CTPSDSet.end(); I!=E; ++I) {
1060      assert(I->isCanonicalDecl() && "Expected only canonical decls in set");
1061      Writer.AddDeclRef(&*I, Record);
1062    }
1063
1064    // InjectedClassNameType is computed, no need to write it.
1065  }
1066  Code = serialization::DECL_CLASS_TEMPLATE;
1067}
1068
1069void ASTDeclWriter::VisitClassTemplateSpecializationDecl(
1070                                           ClassTemplateSpecializationDecl *D) {
1071  VisitCXXRecordDecl(D);
1072
1073  llvm::PointerUnion<ClassTemplateDecl *,
1074                     ClassTemplatePartialSpecializationDecl *> InstFrom
1075    = D->getSpecializedTemplateOrPartial();
1076  if (Decl *InstFromD = InstFrom.dyn_cast<ClassTemplateDecl *>()) {
1077    Writer.AddDeclRef(InstFromD, Record);
1078  } else {
1079    Writer.AddDeclRef(InstFrom.get<ClassTemplatePartialSpecializationDecl *>(),
1080                      Record);
1081    Writer.AddTemplateArgumentList(&D->getTemplateInstantiationArgs(), Record);
1082  }
1083
1084  // Explicit info.
1085  Writer.AddTypeSourceInfo(D->getTypeAsWritten(), Record);
1086  if (D->getTypeAsWritten()) {
1087    Writer.AddSourceLocation(D->getExternLoc(), Record);
1088    Writer.AddSourceLocation(D->getTemplateKeywordLoc(), Record);
1089  }
1090
1091  Writer.AddTemplateArgumentList(&D->getTemplateArgs(), Record);
1092  Writer.AddSourceLocation(D->getPointOfInstantiation(), Record);
1093  Record.push_back(D->getSpecializationKind());
1094
1095  if (D->isCanonicalDecl()) {
1096    // When reading, we'll add it to the folding set of the following template.
1097    Writer.AddDeclRef(D->getSpecializedTemplate()->getCanonicalDecl(), Record);
1098  }
1099
1100  Code = serialization::DECL_CLASS_TEMPLATE_SPECIALIZATION;
1101}
1102
1103void ASTDeclWriter::VisitClassTemplatePartialSpecializationDecl(
1104                                    ClassTemplatePartialSpecializationDecl *D) {
1105  VisitClassTemplateSpecializationDecl(D);
1106
1107  Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1108
1109  Record.push_back(D->getNumTemplateArgsAsWritten());
1110  for (int i = 0, e = D->getNumTemplateArgsAsWritten(); i != e; ++i)
1111    Writer.AddTemplateArgumentLoc(D->getTemplateArgsAsWritten()[i], Record);
1112
1113  Record.push_back(D->getSequenceNumber());
1114
1115  // These are read/set from/to the first declaration.
1116  if (D->getPreviousDeclaration() == 0) {
1117    Writer.AddDeclRef(D->getInstantiatedFromMember(), Record);
1118    Record.push_back(D->isMemberSpecialization());
1119  }
1120
1121  Code = serialization::DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION;
1122}
1123
1124void ASTDeclWriter::VisitClassScopeFunctionSpecializationDecl(
1125                                    ClassScopeFunctionSpecializationDecl *D) {
1126  VisitDecl(D);
1127  Writer.AddDeclRef(D->getSpecialization(), Record);
1128  Code = serialization::DECL_CLASS_SCOPE_FUNCTION_SPECIALIZATION;
1129}
1130
1131
1132void ASTDeclWriter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1133  VisitRedeclarableTemplateDecl(D);
1134
1135  if (D->getPreviousDeclaration() == 0) {
1136    // This FunctionTemplateDecl owns the CommonPtr; write it.
1137
1138    // Write the function specialization declarations.
1139    Record.push_back(D->getSpecializations().size());
1140    for (llvm::FoldingSet<FunctionTemplateSpecializationInfo>::iterator
1141           I = D->getSpecializations().begin(),
1142           E = D->getSpecializations().end()   ; I != E; ++I) {
1143      assert(I->Function->isCanonicalDecl() &&
1144             "Expected only canonical decls in set");
1145      Writer.AddDeclRef(I->Function, Record);
1146    }
1147  }
1148  Code = serialization::DECL_FUNCTION_TEMPLATE;
1149}
1150
1151void ASTDeclWriter::VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D) {
1152  VisitTypeDecl(D);
1153
1154  Record.push_back(D->wasDeclaredWithTypename());
1155  Record.push_back(D->defaultArgumentWasInherited());
1156  Writer.AddTypeSourceInfo(D->getDefaultArgumentInfo(), Record);
1157
1158  Code = serialization::DECL_TEMPLATE_TYPE_PARM;
1159}
1160
1161void ASTDeclWriter::VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {
1162  // For an expanded parameter pack, record the number of expansion types here
1163  // so that it's easier for
1164  if (D->isExpandedParameterPack())
1165    Record.push_back(D->getNumExpansionTypes());
1166
1167  VisitDeclaratorDecl(D);
1168  // TemplateParmPosition.
1169  Record.push_back(D->getDepth());
1170  Record.push_back(D->getPosition());
1171
1172  if (D->isExpandedParameterPack()) {
1173    for (unsigned I = 0, N = D->getNumExpansionTypes(); I != N; ++I) {
1174      Writer.AddTypeRef(D->getExpansionType(I), Record);
1175      Writer.AddTypeSourceInfo(D->getExpansionTypeSourceInfo(I), Record);
1176    }
1177
1178    Code = serialization::DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK;
1179  } else {
1180    // Rest of NonTypeTemplateParmDecl.
1181    Record.push_back(D->isParameterPack());
1182    Record.push_back(D->getDefaultArgument() != 0);
1183    if (D->getDefaultArgument()) {
1184      Writer.AddStmt(D->getDefaultArgument());
1185      Record.push_back(D->defaultArgumentWasInherited());
1186    }
1187    Code = serialization::DECL_NON_TYPE_TEMPLATE_PARM;
1188  }
1189}
1190
1191void ASTDeclWriter::VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D) {
1192  VisitTemplateDecl(D);
1193  // TemplateParmPosition.
1194  Record.push_back(D->getDepth());
1195  Record.push_back(D->getPosition());
1196  // Rest of TemplateTemplateParmDecl.
1197  Writer.AddTemplateArgumentLoc(D->getDefaultArgument(), Record);
1198  Record.push_back(D->defaultArgumentWasInherited());
1199  Record.push_back(D->isParameterPack());
1200  Code = serialization::DECL_TEMPLATE_TEMPLATE_PARM;
1201}
1202
1203void ASTDeclWriter::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) {
1204  VisitRedeclarableTemplateDecl(D);
1205  Code = serialization::DECL_TYPE_ALIAS_TEMPLATE;
1206}
1207
1208void ASTDeclWriter::VisitStaticAssertDecl(StaticAssertDecl *D) {
1209  VisitDecl(D);
1210  Writer.AddStmt(D->getAssertExpr());
1211  Writer.AddStmt(D->getMessage());
1212  Writer.AddSourceLocation(D->getRParenLoc(), Record);
1213  Code = serialization::DECL_STATIC_ASSERT;
1214}
1215
1216/// \brief Emit the DeclContext part of a declaration context decl.
1217///
1218/// \param LexicalOffset the offset at which the DECL_CONTEXT_LEXICAL
1219/// block for this declaration context is stored. May be 0 to indicate
1220/// that there are no declarations stored within this context.
1221///
1222/// \param VisibleOffset the offset at which the DECL_CONTEXT_VISIBLE
1223/// block for this declaration context is stored. May be 0 to indicate
1224/// that there are no declarations visible from this context. Note
1225/// that this value will not be emitted for non-primary declaration
1226/// contexts.
1227void ASTDeclWriter::VisitDeclContext(DeclContext *DC, uint64_t LexicalOffset,
1228                                     uint64_t VisibleOffset) {
1229  Record.push_back(LexicalOffset);
1230  Record.push_back(VisibleOffset);
1231}
1232
1233template <typename T>
1234void ASTDeclWriter::VisitRedeclarable(Redeclarable<T> *D) {
1235  enum { NoRedeclaration = 0, PointsToPrevious, PointsToLatest };
1236  if (D->RedeclLink.getNext() == D) {
1237    Record.push_back(NoRedeclaration);
1238  } else {
1239    if (D->RedeclLink.NextIsPrevious()) {
1240      Record.push_back(PointsToPrevious);
1241      Writer.AddDeclRef(D->getPreviousDeclaration(), Record);
1242      Writer.AddDeclRef(D->getFirstDeclaration(), Record);
1243    } else {
1244      Record.push_back(PointsToLatest);
1245      Writer.AddDeclRef(D->RedeclLink.getPointer(), Record);
1246    }
1247  }
1248
1249  T *First = D->getFirstDeclaration();
1250  T *ThisDecl = static_cast<T*>(D);
1251  // If this is a most recent redeclaration that is pointed to by a first decl
1252  // in a chained PCH, keep track of the association with the map so we can
1253  // update the first decl during AST reading.
1254  if (ThisDecl != First && First->getMostRecentDeclaration() == ThisDecl &&
1255      First->isFromASTFile() && !ThisDecl->isFromASTFile()) {
1256    assert(Writer.FirstLatestDecls.find(First) == Writer.FirstLatestDecls.end()
1257           && "The latest is already set");
1258    Writer.FirstLatestDecls[First] = ThisDecl;
1259  }
1260}
1261
1262//===----------------------------------------------------------------------===//
1263// ASTWriter Implementation
1264//===----------------------------------------------------------------------===//
1265
1266void ASTWriter::WriteDeclsBlockAbbrevs() {
1267  using namespace llvm;
1268
1269  BitCodeAbbrev *Abv;
1270
1271  // Abbreviation for DECL_FIELD
1272  Abv = new BitCodeAbbrev();
1273  Abv->Add(BitCodeAbbrevOp(serialization::DECL_FIELD));
1274  // Decl
1275  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1276  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1277  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1278  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl (!?)
1279  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1280  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1281  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1282  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1283  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1284  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1285  // NamedDecl
1286  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1287  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1288  // ValueDecl
1289  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1290  // DeclaratorDecl
1291  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1292  Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1293  // FieldDecl
1294  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1295  Abv->Add(BitCodeAbbrevOp(0));                       //getBitWidth
1296  // Type Source Info
1297  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1298  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1299  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1300  DeclFieldAbbrev = Stream.EmitAbbrev(Abv);
1301
1302  // Abbreviation for DECL_OBJC_IVAR
1303  Abv = new BitCodeAbbrev();
1304  Abv->Add(BitCodeAbbrevOp(serialization::DECL_OBJC_IVAR));
1305  // Decl
1306  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1307  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1308  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1309  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl (!?)
1310  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1311  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1312  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1313  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1314  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1315  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1316  // NamedDecl
1317  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1318  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1319  // ValueDecl
1320  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1321  // DeclaratorDecl
1322  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1323  Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1324  // FieldDecl
1325  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1326  Abv->Add(BitCodeAbbrevOp(0));                       //getBitWidth
1327  // ObjC Ivar
1328  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getAccessControl
1329  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getSynthesize
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  DeclObjCIvarAbbrev = Stream.EmitAbbrev(Abv);
1335
1336  // Abbreviation for DECL_ENUM
1337  Abv = new BitCodeAbbrev();
1338  Abv->Add(BitCodeAbbrevOp(serialization::DECL_ENUM));
1339  // Redeclarable
1340  Abv->Add(BitCodeAbbrevOp(0));                         // No redeclaration
1341  // Decl
1342  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1343  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1344  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1345  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl (!?)
1346  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1347  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1348  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1349  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1350  Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1351  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1352  // NamedDecl
1353  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1354  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1355  // TypeDecl
1356  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1357  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1358  // TagDecl
1359  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1360  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1361  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1362  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1363  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1364  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1365  Abv->Add(BitCodeAbbrevOp(0));                         // hasExtInfo
1366  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // TypedefNameAnonDecl
1367  // EnumDecl
1368  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // AddTypeRef
1369  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IntegerType
1370  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getPromotionType
1371  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumPositiveBits
1372  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumNegativeBits
1373  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScoped
1374  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScopedUsingClassTag
1375  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isFixed
1376  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // InstantiatedMembEnum
1377  // DC
1378  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1379  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1380  DeclEnumAbbrev = Stream.EmitAbbrev(Abv);
1381
1382  // Abbreviation for DECL_RECORD
1383  Abv = new BitCodeAbbrev();
1384  Abv->Add(BitCodeAbbrevOp(serialization::DECL_RECORD));
1385  // Redeclarable
1386  Abv->Add(BitCodeAbbrevOp(0));                         // No redeclaration
1387  // Decl
1388  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1389  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1390  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1391  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl (!?)
1392  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1393  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1394  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1395  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1396  Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1397  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1398  // NamedDecl
1399  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1400  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1401  // TypeDecl
1402  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1403  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1404  // TagDecl
1405  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1406  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1407  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1408  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1409  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1410  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1411  Abv->Add(BitCodeAbbrevOp(0));                         // hasExtInfo
1412  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // TypedefNameAnonDecl
1413  // RecordDecl
1414  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // FlexibleArrayMember
1415  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // AnonymousStructUnion
1416  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasObjectMember
1417  // DC
1418  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1419  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1420  DeclRecordAbbrev = Stream.EmitAbbrev(Abv);
1421
1422  // Abbreviation for DECL_PARM_VAR
1423  Abv = new BitCodeAbbrev();
1424  Abv->Add(BitCodeAbbrevOp(serialization::DECL_PARM_VAR));
1425  // Redeclarable
1426  Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1427  // Decl
1428  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1429  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1430  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1431  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl (!?)
1432  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1433  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1434  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1435  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1436  Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1437  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1438  // NamedDecl
1439  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1440  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1441  // ValueDecl
1442  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1443  // DeclaratorDecl
1444  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1445  Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1446  // VarDecl
1447  Abv->Add(BitCodeAbbrevOp(0));                       // StorageClass
1448  Abv->Add(BitCodeAbbrevOp(0));                       // StorageClassAsWritten
1449  Abv->Add(BitCodeAbbrevOp(0));                       // isThreadSpecified
1450  Abv->Add(BitCodeAbbrevOp(0));                       // hasCXXDirectInitializer
1451  Abv->Add(BitCodeAbbrevOp(0));                       // isExceptionVariable
1452  Abv->Add(BitCodeAbbrevOp(0));                       // isNRVOVariable
1453  Abv->Add(BitCodeAbbrevOp(0));                       // isCXXForRangeDecl
1454  Abv->Add(BitCodeAbbrevOp(0));                       // isARCPseudoStrong
1455  Abv->Add(BitCodeAbbrevOp(0));                       // HasInit
1456  Abv->Add(BitCodeAbbrevOp(0));                   // HasMemberSpecializationInfo
1457  // ParmVarDecl
1458  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsObjCMethodParameter
1459  Abv->Add(BitCodeAbbrevOp(0));                       // ScopeDepth
1460  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ScopeIndex
1461  Abv->Add(BitCodeAbbrevOp(0));                       // ObjCDeclQualifier
1462  Abv->Add(BitCodeAbbrevOp(0));                       // KNRPromoted
1463  Abv->Add(BitCodeAbbrevOp(0));                       // HasInheritedDefaultArg
1464  Abv->Add(BitCodeAbbrevOp(0));                   // HasUninstantiatedDefaultArg
1465  // Type Source Info
1466  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1467  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1468  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1469  DeclParmVarAbbrev = Stream.EmitAbbrev(Abv);
1470
1471  // Abbreviation for DECL_TYPEDEF
1472  Abv = new BitCodeAbbrev();
1473  Abv->Add(BitCodeAbbrevOp(serialization::DECL_TYPEDEF));
1474  // Decl
1475  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1476  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1477  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1478  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl (!?)
1479  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1480  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1481  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1482  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1483  Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1484  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1485  // NamedDecl
1486  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1487  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1488  // TypeDecl
1489  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1490  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1491  // TypedefDecl
1492  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1493  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1494  DeclTypedefAbbrev = Stream.EmitAbbrev(Abv);
1495
1496  // Abbreviation for DECL_VAR
1497  Abv = new BitCodeAbbrev();
1498  Abv->Add(BitCodeAbbrevOp(serialization::DECL_VAR));
1499  // Redeclarable
1500  Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1501  // Decl
1502  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1503  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // LexicalDeclContext
1504  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1505  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl (!?)
1506  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1507  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1508  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1509  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1510  Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1511  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1512  // NamedDecl
1513  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1514  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1515  // ValueDecl
1516  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1517  // DeclaratorDecl
1518  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1519  Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1520  // VarDecl
1521  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // StorageClass
1522  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // StorageClassAsWritten
1523  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isThreadSpecified
1524  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // CXXDirectInitializer
1525  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isExceptionVariable
1526  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isNRVOVariable
1527  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCXXForRangeDecl
1528  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isARCPseudoStrong
1529  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // HasInit
1530  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // HasMemberSpecInfo
1531  // Type Source Info
1532  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1533  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1534  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1535  DeclVarAbbrev = Stream.EmitAbbrev(Abv);
1536
1537  // Abbreviation for EXPR_DECL_REF
1538  Abv = new BitCodeAbbrev();
1539  Abv->Add(BitCodeAbbrevOp(serialization::EXPR_DECL_REF));
1540  //Stmt
1541  //Expr
1542  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1543  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
1544  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
1545  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
1546  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
1547  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
1548  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
1549  //DeclRefExpr
1550  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HasQualifier
1551  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //GetDeclFound
1552  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ExplicitTemplateArgs
1553  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HadMultipleCandidates
1554  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclRef
1555  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1556  DeclRefExprAbbrev = Stream.EmitAbbrev(Abv);
1557
1558  // Abbreviation for EXPR_INTEGER_LITERAL
1559  Abv = new BitCodeAbbrev();
1560  Abv->Add(BitCodeAbbrevOp(serialization::EXPR_INTEGER_LITERAL));
1561  //Stmt
1562  //Expr
1563  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1564  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
1565  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
1566  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
1567  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
1568  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
1569  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
1570  //Integer Literal
1571  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1572  Abv->Add(BitCodeAbbrevOp(32));                      // Bit Width
1573  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Value
1574  IntegerLiteralAbbrev = Stream.EmitAbbrev(Abv);
1575
1576  // Abbreviation for EXPR_CHARACTER_LITERAL
1577  Abv = new BitCodeAbbrev();
1578  Abv->Add(BitCodeAbbrevOp(serialization::EXPR_CHARACTER_LITERAL));
1579  //Stmt
1580  //Expr
1581  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1582  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
1583  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
1584  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
1585  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
1586  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
1587  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
1588  //Character Literal
1589  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getValue
1590  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
1591  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //IsWide
1592  CharacterLiteralAbbrev = Stream.EmitAbbrev(Abv);
1593
1594  Abv = new BitCodeAbbrev();
1595  Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_LEXICAL));
1596  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1597  DeclContextLexicalAbbrev = Stream.EmitAbbrev(Abv);
1598
1599  Abv = new BitCodeAbbrev();
1600  Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_VISIBLE));
1601  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));
1602  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
1603  DeclContextVisibleLookupAbbrev = Stream.EmitAbbrev(Abv);
1604}
1605
1606/// isRequiredDecl - Check if this is a "required" Decl, which must be seen by
1607/// consumers of the AST.
1608///
1609/// Such decls will always be deserialized from the AST file, so we would like
1610/// this to be as restrictive as possible. Currently the predicate is driven by
1611/// code generation requirements, if other clients have a different notion of
1612/// what is "required" then we may have to consider an alternate scheme where
1613/// clients can iterate over the top-level decls and get information on them,
1614/// without necessary deserializing them. We could explicitly require such
1615/// clients to use a separate API call to "realize" the decl. This should be
1616/// relatively painless since they would presumably only do it for top-level
1617/// decls.
1618static bool isRequiredDecl(const Decl *D, ASTContext &Context) {
1619  // An ObjCMethodDecl is never considered as "required" because its
1620  // implementation container always is.
1621
1622  // File scoped assembly or obj-c implementation must be seen.
1623  if (isa<FileScopeAsmDecl>(D) || isa<ObjCImplDecl>(D))
1624    return true;
1625
1626  return Context.DeclMustBeEmitted(D);
1627}
1628
1629void ASTWriter::WriteDecl(ASTContext &Context, Decl *D) {
1630  // Switch case IDs are per Decl.
1631  ClearSwitchCaseIDs();
1632
1633  RecordData Record;
1634  ASTDeclWriter W(*this, Context, Record);
1635
1636  // If this declaration is also a DeclContext, write blocks for the
1637  // declarations that lexically stored inside its context and those
1638  // declarations that are visible from its context. These blocks
1639  // are written before the declaration itself so that we can put
1640  // their offsets into the record for the declaration.
1641  uint64_t LexicalOffset = 0;
1642  uint64_t VisibleOffset = 0;
1643  DeclContext *DC = dyn_cast<DeclContext>(D);
1644  if (DC) {
1645    LexicalOffset = WriteDeclContextLexicalBlock(Context, DC);
1646    VisibleOffset = WriteDeclContextVisibleBlock(Context, DC);
1647  }
1648
1649  // Determine the ID for this declaration
1650  serialization::DeclID &IDR = DeclIDs[D];
1651  if (IDR == 0)
1652    IDR = NextDeclID++;
1653  serialization::DeclID ID = IDR;
1654
1655  if (ID < FirstDeclID) {
1656    // We're replacing a decl in a previous file.
1657    ReplacedDecls.push_back(std::make_pair(ID, Stream.GetCurrentBitNo()));
1658  } else {
1659    unsigned Index = ID - FirstDeclID;
1660
1661    // Record the offset for this declaration
1662    if (DeclOffsets.size() == Index)
1663      DeclOffsets.push_back(Stream.GetCurrentBitNo());
1664    else if (DeclOffsets.size() < Index) {
1665      DeclOffsets.resize(Index+1);
1666      DeclOffsets[Index] = Stream.GetCurrentBitNo();
1667    }
1668  }
1669
1670  // Build and emit a record for this declaration
1671  Record.clear();
1672  W.Code = (serialization::DeclCode)0;
1673  W.AbbrevToUse = 0;
1674  W.Visit(D);
1675  if (DC) W.VisitDeclContext(DC, LexicalOffset, VisibleOffset);
1676
1677  if (!W.Code)
1678    llvm::report_fatal_error(StringRef("unexpected declaration kind '") +
1679                            D->getDeclKindName() + "'");
1680  Stream.EmitRecord(W.Code, Record, W.AbbrevToUse);
1681
1682  // Flush any expressions that were written as part of this declaration.
1683  FlushStmts();
1684
1685  // Flush C++ base specifiers, if there are any.
1686  FlushCXXBaseSpecifiers();
1687
1688  // Note "external" declarations so that we can add them to a record in the
1689  // AST file later.
1690  //
1691  // FIXME: This should be renamed, the predicate is much more complicated.
1692  if (isRequiredDecl(D, Context))
1693    ExternalDefinitions.push_back(ID);
1694}
1695