1 //===--- ASTWriterDecl.cpp - Declaration Serialization --------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 //  This file implements serialization for Declarations.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "clang/Serialization/ASTWriter.h"
15 #include "ASTCommon.h"
16 #include "clang/AST/DeclCXX.h"
17 #include "clang/AST/DeclContextInternals.h"
18 #include "clang/AST/DeclTemplate.h"
19 #include "clang/AST/DeclVisitor.h"
20 #include "clang/AST/Expr.h"
21 #include "clang/Basic/SourceManager.h"
22 #include "clang/Serialization/ASTReader.h"
23 #include "llvm/ADT/Twine.h"
24 #include "llvm/Bitcode/BitstreamWriter.h"
25 #include "llvm/Support/ErrorHandling.h"
26 using namespace clang;
27 using namespace serialization;
28 
29 //===----------------------------------------------------------------------===//
30 // Declaration serialization
31 //===----------------------------------------------------------------------===//
32 
33 namespace 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 VisitPragmaCommentDecl(PragmaCommentDecl *D);
53     void VisitPragmaDetectMismatchDecl(PragmaDetectMismatchDecl *D);
54     void VisitTranslationUnitDecl(TranslationUnitDecl *D);
55     void VisitNamedDecl(NamedDecl *D);
56     void VisitLabelDecl(LabelDecl *LD);
57     void VisitNamespaceDecl(NamespaceDecl *D);
58     void VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
59     void VisitNamespaceAliasDecl(NamespaceAliasDecl *D);
60     void VisitTypeDecl(TypeDecl *D);
61     void VisitTypedefNameDecl(TypedefNameDecl *D);
62     void VisitTypedefDecl(TypedefDecl *D);
63     void VisitTypeAliasDecl(TypeAliasDecl *D);
64     void VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
65     void VisitTagDecl(TagDecl *D);
66     void VisitEnumDecl(EnumDecl *D);
67     void VisitRecordDecl(RecordDecl *D);
68     void VisitCXXRecordDecl(CXXRecordDecl *D);
69     void VisitClassTemplateSpecializationDecl(
70                                             ClassTemplateSpecializationDecl *D);
71     void VisitClassTemplatePartialSpecializationDecl(
72                                      ClassTemplatePartialSpecializationDecl *D);
73     void VisitVarTemplateSpecializationDecl(VarTemplateSpecializationDecl *D);
74     void VisitVarTemplatePartialSpecializationDecl(
75         VarTemplatePartialSpecializationDecl *D);
76     void VisitClassScopeFunctionSpecializationDecl(
77                                        ClassScopeFunctionSpecializationDecl *D);
78     void VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D);
79     void VisitValueDecl(ValueDecl *D);
80     void VisitEnumConstantDecl(EnumConstantDecl *D);
81     void VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
82     void VisitDeclaratorDecl(DeclaratorDecl *D);
83     void VisitFunctionDecl(FunctionDecl *D);
84     void VisitCXXMethodDecl(CXXMethodDecl *D);
85     void VisitCXXConstructorDecl(CXXConstructorDecl *D);
86     void VisitCXXDestructorDecl(CXXDestructorDecl *D);
87     void VisitCXXConversionDecl(CXXConversionDecl *D);
88     void VisitFieldDecl(FieldDecl *D);
89     void VisitMSPropertyDecl(MSPropertyDecl *D);
90     void VisitIndirectFieldDecl(IndirectFieldDecl *D);
91     void VisitVarDecl(VarDecl *D);
92     void VisitImplicitParamDecl(ImplicitParamDecl *D);
93     void VisitParmVarDecl(ParmVarDecl *D);
94     void VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D);
95     void VisitTemplateDecl(TemplateDecl *D);
96     void VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D);
97     void VisitClassTemplateDecl(ClassTemplateDecl *D);
98     void VisitVarTemplateDecl(VarTemplateDecl *D);
99     void VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
100     void VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D);
101     void VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D);
102     void VisitUsingDecl(UsingDecl *D);
103     void VisitUsingShadowDecl(UsingShadowDecl *D);
104     void VisitLinkageSpecDecl(LinkageSpecDecl *D);
105     void VisitFileScopeAsmDecl(FileScopeAsmDecl *D);
106     void VisitImportDecl(ImportDecl *D);
107     void VisitAccessSpecDecl(AccessSpecDecl *D);
108     void VisitFriendDecl(FriendDecl *D);
109     void VisitFriendTemplateDecl(FriendTemplateDecl *D);
110     void VisitStaticAssertDecl(StaticAssertDecl *D);
111     void VisitBlockDecl(BlockDecl *D);
112     void VisitCapturedDecl(CapturedDecl *D);
113     void VisitEmptyDecl(EmptyDecl *D);
114 
115     void VisitDeclContext(DeclContext *DC, uint64_t LexicalOffset,
116                           uint64_t VisibleOffset);
117     template <typename T> void VisitRedeclarable(Redeclarable<T> *D);
118 
119 
120     // FIXME: Put in the same order is DeclNodes.td?
121     void VisitObjCMethodDecl(ObjCMethodDecl *D);
122     void VisitObjCTypeParamDecl(ObjCTypeParamDecl *D);
123     void VisitObjCContainerDecl(ObjCContainerDecl *D);
124     void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
125     void VisitObjCIvarDecl(ObjCIvarDecl *D);
126     void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
127     void VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D);
128     void VisitObjCCategoryDecl(ObjCCategoryDecl *D);
129     void VisitObjCImplDecl(ObjCImplDecl *D);
130     void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
131     void VisitObjCImplementationDecl(ObjCImplementationDecl *D);
132     void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D);
133     void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
134     void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
135     void VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D);
136     void VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D);
137 
138     /// Add an Objective-C type parameter list to the given record.
139     void AddObjCTypeParamList(ObjCTypeParamList *typeParams) {
140       // Empty type parameter list.
141       if (!typeParams) {
142         Record.push_back(0);
143         return;
144       }
145 
146       Record.push_back(typeParams->size());
147       for (auto typeParam : *typeParams) {
148         Writer.AddDeclRef(typeParam, Record);
149       }
150       Writer.AddSourceLocation(typeParams->getLAngleLoc(), Record);
151       Writer.AddSourceLocation(typeParams->getRAngleLoc(), Record);
152     }
153 
154     void AddFunctionDefinition(const FunctionDecl *FD) {
155       assert(FD->doesThisDeclarationHaveABody());
156       if (auto *CD = dyn_cast<CXXConstructorDecl>(FD)) {
157         Record.push_back(CD->NumCtorInitializers);
158         if (CD->NumCtorInitializers)
159           Writer.AddCXXCtorInitializersRef(
160               llvm::makeArrayRef(CD->init_begin(), CD->init_end()), Record);
161       }
162       Writer.AddStmt(FD->getBody());
163     }
164 
165     /// Add to the record the first declaration from each module file that
166     /// provides a declaration of D. The intent is to provide a sufficient
167     /// set such that reloading this set will load all current redeclarations.
168     void AddFirstDeclFromEachModule(const Decl *D, bool IncludeLocal) {
169       llvm::MapVector<ModuleFile*, const Decl*> Firsts;
170       // FIXME: We can skip entries that we know are implied by others.
171       for (const Decl *R = D->getMostRecentDecl(); R; R = R->getPreviousDecl()) {
172         if (R->isFromASTFile())
173           Firsts[Writer.Chain->getOwningModuleFile(R)] = R;
174         else if (IncludeLocal)
175           Firsts[nullptr] = R;
176       }
177       for (const auto &F : Firsts)
178         Writer.AddDeclRef(F.second, Record);
179     }
180 
181     /// Get the specialization decl from an entry in the specialization list.
182     template <typename EntryType>
183     typename RedeclarableTemplateDecl::SpecEntryTraits<EntryType>::DeclType *
184     getSpecializationDecl(EntryType &T) {
185       return RedeclarableTemplateDecl::SpecEntryTraits<EntryType>::getDecl(&T);
186     }
187 
188     /// Get the list of partial specializations from a template's common ptr.
189     template<typename T>
190     decltype(T::PartialSpecializations) &getPartialSpecializations(T *Common) {
191       return Common->PartialSpecializations;
192     }
193     ArrayRef<Decl> getPartialSpecializations(FunctionTemplateDecl::Common *) {
194       return None;
195     }
196 
197     template<typename DeclTy>
198     void AddTemplateSpecializations(DeclTy *D) {
199       auto *Common = D->getCommonPtr();
200 
201       // If we have any lazy specializations, and the external AST source is
202       // our chained AST reader, we can just write out the DeclIDs. Otherwise,
203       // we need to resolve them to actual declarations.
204       if (Writer.Chain != Writer.Context->getExternalSource() &&
205           Common->LazySpecializations) {
206         D->LoadLazySpecializations();
207         assert(!Common->LazySpecializations);
208       }
209 
210       ArrayRef<DeclID> LazySpecializations;
211       if (auto *LS = Common->LazySpecializations)
212         LazySpecializations = llvm::makeArrayRef(LS + 1, LS[0]);
213 
214       // Add a slot to the record for the number of specializations.
215       unsigned I = Record.size();
216       Record.push_back(0);
217 
218       // AddFirstDeclFromEachModule might trigger deserialization, invalidating
219       // *Specializations iterators.
220       llvm::SmallVector<const Decl*, 16> Specs;
221       for (auto &Entry : Common->Specializations)
222         Specs.push_back(getSpecializationDecl(Entry));
223       for (auto &Entry : getPartialSpecializations(Common))
224         Specs.push_back(getSpecializationDecl(Entry));
225 
226       for (auto *D : Specs) {
227         assert(D->isCanonicalDecl() && "non-canonical decl in set");
228         AddFirstDeclFromEachModule(D, /*IncludeLocal*/true);
229       }
230       Record.append(LazySpecializations.begin(), LazySpecializations.end());
231 
232       // Update the size entry we added earlier.
233       Record[I] = Record.size() - I - 1;
234     }
235 
236     /// Ensure that this template specialization is associated with the specified
237     /// template on reload.
238     void RegisterTemplateSpecialization(const Decl *Template,
239                                         const Decl *Specialization) {
240       Template = Template->getCanonicalDecl();
241 
242       // If the canonical template is local, we'll write out this specialization
243       // when we emit it.
244       // FIXME: We can do the same thing if there is any local declaration of
245       // the template, to avoid emitting an update record.
246       if (!Template->isFromASTFile())
247         return;
248 
249       // We only need to associate the first local declaration of the
250       // specialization. The other declarations will get pulled in by it.
251       if (Writer.getFirstLocalDecl(Specialization) != Specialization)
252         return;
253 
254       Writer.DeclUpdates[Template].push_back(ASTWriter::DeclUpdate(
255           UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION, Specialization));
256     }
257   };
258 }
259 
260 void ASTDeclWriter::Visit(Decl *D) {
261   DeclVisitor<ASTDeclWriter>::Visit(D);
262 
263   // Source locations require array (variable-length) abbreviations.  The
264   // abbreviation infrastructure requires that arrays are encoded last, so
265   // we handle it here in the case of those classes derived from DeclaratorDecl
266   if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)) {
267     Writer.AddTypeSourceInfo(DD->getTypeSourceInfo(), Record);
268   }
269 
270   // Handle FunctionDecl's body here and write it after all other Stmts/Exprs
271   // have been written. We want it last because we will not read it back when
272   // retrieving it from the AST, we'll just lazily set the offset.
273   if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
274     Record.push_back(FD->doesThisDeclarationHaveABody());
275     if (FD->doesThisDeclarationHaveABody())
276       AddFunctionDefinition(FD);
277   }
278 }
279 
280 void ASTDeclWriter::VisitDecl(Decl *D) {
281   Writer.AddDeclRef(cast_or_null<Decl>(D->getDeclContext()), Record);
282   if (D->getDeclContext() != D->getLexicalDeclContext())
283     Writer.AddDeclRef(cast_or_null<Decl>(D->getLexicalDeclContext()), Record);
284   else
285     Record.push_back(0);
286   Record.push_back(D->isInvalidDecl());
287   Record.push_back(D->hasAttrs());
288   if (D->hasAttrs())
289     Writer.WriteAttributes(llvm::makeArrayRef(D->getAttrs().begin(),
290                                               D->getAttrs().size()), Record);
291   Record.push_back(D->isImplicit());
292   Record.push_back(D->isUsed(false));
293   Record.push_back(D->isReferenced());
294   Record.push_back(D->isTopLevelDeclInObjCContainer());
295   Record.push_back(D->getAccess());
296   Record.push_back(D->isModulePrivate());
297   Record.push_back(Writer.inferSubmoduleIDFromLocation(D->getLocation()));
298 
299   // If this declaration injected a name into a context different from its
300   // lexical context, and that context is an imported namespace, we need to
301   // update its visible declarations to include this name.
302   //
303   // This happens when we instantiate a class with a friend declaration or a
304   // function with a local extern declaration, for instance.
305   //
306   // FIXME: Can we handle this in AddedVisibleDecl instead?
307   if (D->isOutOfLine()) {
308     auto *DC = D->getDeclContext();
309     while (auto *NS = dyn_cast<NamespaceDecl>(DC->getRedeclContext())) {
310       if (!NS->isFromASTFile())
311         break;
312       Writer.UpdatedDeclContexts.insert(NS->getPrimaryContext());
313       if (!NS->isInlineNamespace())
314         break;
315       DC = NS->getParent();
316     }
317   }
318 }
319 
320 void ASTDeclWriter::VisitPragmaCommentDecl(PragmaCommentDecl *D) {
321   StringRef Arg = D->getArg();
322   Record.push_back(Arg.size());
323   VisitDecl(D);
324   Writer.AddSourceLocation(D->getLocStart(), Record);
325   Record.push_back(D->getCommentKind());
326   Writer.AddString(Arg, Record);
327   Code = serialization::DECL_PRAGMA_COMMENT;
328 }
329 
330 void ASTDeclWriter::VisitPragmaDetectMismatchDecl(
331     PragmaDetectMismatchDecl *D) {
332   StringRef Name = D->getName();
333   StringRef Value = D->getValue();
334   Record.push_back(Name.size() + 1 + Value.size());
335   VisitDecl(D);
336   Writer.AddSourceLocation(D->getLocStart(), Record);
337   Writer.AddString(Name, Record);
338   Writer.AddString(Value, Record);
339   Code = serialization::DECL_PRAGMA_DETECT_MISMATCH;
340 }
341 
342 void ASTDeclWriter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
343   llvm_unreachable("Translation units aren't directly serialized");
344 }
345 
346 void ASTDeclWriter::VisitNamedDecl(NamedDecl *D) {
347   VisitDecl(D);
348   Writer.AddDeclarationName(D->getDeclName(), Record);
349   Record.push_back(needsAnonymousDeclarationNumber(D)
350                        ? Writer.getAnonymousDeclarationNumber(D)
351                        : 0);
352 }
353 
354 void ASTDeclWriter::VisitTypeDecl(TypeDecl *D) {
355   VisitNamedDecl(D);
356   Writer.AddSourceLocation(D->getLocStart(), Record);
357   Writer.AddTypeRef(QualType(D->getTypeForDecl(), 0), Record);
358 }
359 
360 void ASTDeclWriter::VisitTypedefNameDecl(TypedefNameDecl *D) {
361   VisitRedeclarable(D);
362   VisitTypeDecl(D);
363   Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record);
364   Record.push_back(D->isModed());
365   if (D->isModed())
366     Writer.AddTypeRef(D->getUnderlyingType(), Record);
367 }
368 
369 void ASTDeclWriter::VisitTypedefDecl(TypedefDecl *D) {
370   VisitTypedefNameDecl(D);
371   if (D->getDeclContext() == D->getLexicalDeclContext() &&
372       !D->hasAttrs() &&
373       !D->isImplicit() &&
374       D->getFirstDecl() == D->getMostRecentDecl() &&
375       !D->isInvalidDecl() &&
376       !D->isTopLevelDeclInObjCContainer() &&
377       !D->isModulePrivate() &&
378       !needsAnonymousDeclarationNumber(D) &&
379       D->getDeclName().getNameKind() == DeclarationName::Identifier)
380     AbbrevToUse = Writer.getDeclTypedefAbbrev();
381 
382   Code = serialization::DECL_TYPEDEF;
383 }
384 
385 void ASTDeclWriter::VisitTypeAliasDecl(TypeAliasDecl *D) {
386   VisitTypedefNameDecl(D);
387   Writer.AddDeclRef(D->getDescribedAliasTemplate(), Record);
388   Code = serialization::DECL_TYPEALIAS;
389 }
390 
391 void ASTDeclWriter::VisitTagDecl(TagDecl *D) {
392   VisitRedeclarable(D);
393   VisitTypeDecl(D);
394   Record.push_back(D->getIdentifierNamespace());
395   Record.push_back((unsigned)D->getTagKind()); // FIXME: stable encoding
396   if (!isa<CXXRecordDecl>(D))
397     Record.push_back(D->isCompleteDefinition());
398   Record.push_back(D->isEmbeddedInDeclarator());
399   Record.push_back(D->isFreeStanding());
400   Record.push_back(D->isCompleteDefinitionRequired());
401   Writer.AddSourceLocation(D->getRBraceLoc(), Record);
402 
403   if (D->hasExtInfo()) {
404     Record.push_back(1);
405     Writer.AddQualifierInfo(*D->getExtInfo(), Record);
406   } else if (auto *TD = D->getTypedefNameForAnonDecl()) {
407     Record.push_back(2);
408     Writer.AddDeclRef(TD, Record);
409     Writer.AddIdentifierRef(TD->getDeclName().getAsIdentifierInfo(), Record);
410   } else {
411     Record.push_back(0);
412   }
413 }
414 
415 void ASTDeclWriter::VisitEnumDecl(EnumDecl *D) {
416   VisitTagDecl(D);
417   Writer.AddTypeSourceInfo(D->getIntegerTypeSourceInfo(), Record);
418   if (!D->getIntegerTypeSourceInfo())
419     Writer.AddTypeRef(D->getIntegerType(), Record);
420   Writer.AddTypeRef(D->getPromotionType(), Record);
421   Record.push_back(D->getNumPositiveBits());
422   Record.push_back(D->getNumNegativeBits());
423   Record.push_back(D->isScoped());
424   Record.push_back(D->isScopedUsingClassTag());
425   Record.push_back(D->isFixed());
426   if (MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo()) {
427     Writer.AddDeclRef(MemberInfo->getInstantiatedFrom(), Record);
428     Record.push_back(MemberInfo->getTemplateSpecializationKind());
429     Writer.AddSourceLocation(MemberInfo->getPointOfInstantiation(), Record);
430   } else {
431     Writer.AddDeclRef(nullptr, Record);
432   }
433 
434   if (D->getDeclContext() == D->getLexicalDeclContext() &&
435       !D->hasAttrs() &&
436       !D->isImplicit() &&
437       !D->isUsed(false) &&
438       !D->hasExtInfo() &&
439       !D->getTypedefNameForAnonDecl() &&
440       D->getFirstDecl() == D->getMostRecentDecl() &&
441       !D->isInvalidDecl() &&
442       !D->isReferenced() &&
443       !D->isTopLevelDeclInObjCContainer() &&
444       D->getAccess() == AS_none &&
445       !D->isModulePrivate() &&
446       !CXXRecordDecl::classofKind(D->getKind()) &&
447       !D->getIntegerTypeSourceInfo() &&
448       !D->getMemberSpecializationInfo() &&
449       !needsAnonymousDeclarationNumber(D) &&
450       D->getDeclName().getNameKind() == DeclarationName::Identifier)
451     AbbrevToUse = Writer.getDeclEnumAbbrev();
452 
453   Code = serialization::DECL_ENUM;
454 }
455 
456 void ASTDeclWriter::VisitRecordDecl(RecordDecl *D) {
457   VisitTagDecl(D);
458   Record.push_back(D->hasFlexibleArrayMember());
459   Record.push_back(D->isAnonymousStructOrUnion());
460   Record.push_back(D->hasObjectMember());
461   Record.push_back(D->hasVolatileMember());
462 
463   if (D->getDeclContext() == D->getLexicalDeclContext() &&
464       !D->hasAttrs() &&
465       !D->isImplicit() &&
466       !D->isUsed(false) &&
467       !D->hasExtInfo() &&
468       !D->getTypedefNameForAnonDecl() &&
469       D->getFirstDecl() == D->getMostRecentDecl() &&
470       !D->isInvalidDecl() &&
471       !D->isReferenced() &&
472       !D->isTopLevelDeclInObjCContainer() &&
473       D->getAccess() == AS_none &&
474       !D->isModulePrivate() &&
475       !CXXRecordDecl::classofKind(D->getKind()) &&
476       !needsAnonymousDeclarationNumber(D) &&
477       D->getDeclName().getNameKind() == DeclarationName::Identifier)
478     AbbrevToUse = Writer.getDeclRecordAbbrev();
479 
480   Code = serialization::DECL_RECORD;
481 }
482 
483 void ASTDeclWriter::VisitValueDecl(ValueDecl *D) {
484   VisitNamedDecl(D);
485   Writer.AddTypeRef(D->getType(), Record);
486 }
487 
488 void ASTDeclWriter::VisitEnumConstantDecl(EnumConstantDecl *D) {
489   VisitValueDecl(D);
490   Record.push_back(D->getInitExpr()? 1 : 0);
491   if (D->getInitExpr())
492     Writer.AddStmt(D->getInitExpr());
493   Writer.AddAPSInt(D->getInitVal(), Record);
494 
495   Code = serialization::DECL_ENUM_CONSTANT;
496 }
497 
498 void ASTDeclWriter::VisitDeclaratorDecl(DeclaratorDecl *D) {
499   VisitValueDecl(D);
500   Writer.AddSourceLocation(D->getInnerLocStart(), Record);
501   Record.push_back(D->hasExtInfo());
502   if (D->hasExtInfo())
503     Writer.AddQualifierInfo(*D->getExtInfo(), Record);
504 }
505 
506 void ASTDeclWriter::VisitFunctionDecl(FunctionDecl *D) {
507   VisitRedeclarable(D);
508   VisitDeclaratorDecl(D);
509   Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
510   Record.push_back(D->getIdentifierNamespace());
511 
512   // FunctionDecl's body is handled last at ASTWriterDecl::Visit,
513   // after everything else is written.
514 
515   Record.push_back((int)D->SClass); // FIXME: stable encoding
516   Record.push_back(D->IsInline);
517   Record.push_back(D->IsInlineSpecified);
518   Record.push_back(D->IsVirtualAsWritten);
519   Record.push_back(D->IsPure);
520   Record.push_back(D->HasInheritedPrototype);
521   Record.push_back(D->HasWrittenPrototype);
522   Record.push_back(D->IsDeleted);
523   Record.push_back(D->IsTrivial);
524   Record.push_back(D->IsDefaulted);
525   Record.push_back(D->IsExplicitlyDefaulted);
526   Record.push_back(D->HasImplicitReturnZero);
527   Record.push_back(D->IsConstexpr);
528   Record.push_back(D->HasSkippedBody);
529   Record.push_back(D->IsLateTemplateParsed);
530   Record.push_back(D->getLinkageInternal());
531   Writer.AddSourceLocation(D->getLocEnd(), Record);
532 
533   Record.push_back(D->getTemplatedKind());
534   switch (D->getTemplatedKind()) {
535   case FunctionDecl::TK_NonTemplate:
536     break;
537   case FunctionDecl::TK_FunctionTemplate:
538     Writer.AddDeclRef(D->getDescribedFunctionTemplate(), Record);
539     break;
540   case FunctionDecl::TK_MemberSpecialization: {
541     MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo();
542     Writer.AddDeclRef(MemberInfo->getInstantiatedFrom(), Record);
543     Record.push_back(MemberInfo->getTemplateSpecializationKind());
544     Writer.AddSourceLocation(MemberInfo->getPointOfInstantiation(), Record);
545     break;
546   }
547   case FunctionDecl::TK_FunctionTemplateSpecialization: {
548     FunctionTemplateSpecializationInfo *
549       FTSInfo = D->getTemplateSpecializationInfo();
550 
551     RegisterTemplateSpecialization(FTSInfo->getTemplate(), D);
552 
553     Writer.AddDeclRef(FTSInfo->getTemplate(), Record);
554     Record.push_back(FTSInfo->getTemplateSpecializationKind());
555 
556     // Template arguments.
557     Writer.AddTemplateArgumentList(FTSInfo->TemplateArguments, Record);
558 
559     // Template args as written.
560     Record.push_back(FTSInfo->TemplateArgumentsAsWritten != nullptr);
561     if (FTSInfo->TemplateArgumentsAsWritten) {
562       Record.push_back(FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs);
563       for (int i=0, e = FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs;
564              i!=e; ++i)
565         Writer.AddTemplateArgumentLoc((*FTSInfo->TemplateArgumentsAsWritten)[i],
566                                       Record);
567       Writer.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->LAngleLoc,
568                                Record);
569       Writer.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->RAngleLoc,
570                                Record);
571     }
572 
573     Writer.AddSourceLocation(FTSInfo->getPointOfInstantiation(), Record);
574 
575     if (D->isCanonicalDecl()) {
576       // Write the template that contains the specializations set. We will
577       // add a FunctionTemplateSpecializationInfo to it when reading.
578       Writer.AddDeclRef(FTSInfo->getTemplate()->getCanonicalDecl(), Record);
579     }
580     break;
581   }
582   case FunctionDecl::TK_DependentFunctionTemplateSpecialization: {
583     DependentFunctionTemplateSpecializationInfo *
584       DFTSInfo = D->getDependentSpecializationInfo();
585 
586     // Templates.
587     Record.push_back(DFTSInfo->getNumTemplates());
588     for (int i=0, e = DFTSInfo->getNumTemplates(); i != e; ++i)
589       Writer.AddDeclRef(DFTSInfo->getTemplate(i), Record);
590 
591     // Templates args.
592     Record.push_back(DFTSInfo->getNumTemplateArgs());
593     for (int i=0, e = DFTSInfo->getNumTemplateArgs(); i != e; ++i)
594       Writer.AddTemplateArgumentLoc(DFTSInfo->getTemplateArg(i), Record);
595     Writer.AddSourceLocation(DFTSInfo->getLAngleLoc(), Record);
596     Writer.AddSourceLocation(DFTSInfo->getRAngleLoc(), Record);
597     break;
598   }
599   }
600 
601   Record.push_back(D->param_size());
602   for (auto P : D->params())
603     Writer.AddDeclRef(P, Record);
604   Code = serialization::DECL_FUNCTION;
605 }
606 
607 void ASTDeclWriter::VisitObjCMethodDecl(ObjCMethodDecl *D) {
608   VisitNamedDecl(D);
609   // FIXME: convert to LazyStmtPtr?
610   // Unlike C/C++, method bodies will never be in header files.
611   bool HasBodyStuff = D->getBody() != nullptr     ||
612                       D->getSelfDecl() != nullptr || D->getCmdDecl() != nullptr;
613   Record.push_back(HasBodyStuff);
614   if (HasBodyStuff) {
615     Writer.AddStmt(D->getBody());
616     Writer.AddDeclRef(D->getSelfDecl(), Record);
617     Writer.AddDeclRef(D->getCmdDecl(), Record);
618   }
619   Record.push_back(D->isInstanceMethod());
620   Record.push_back(D->isVariadic());
621   Record.push_back(D->isPropertyAccessor());
622   Record.push_back(D->isDefined());
623   Record.push_back(D->IsOverriding);
624   Record.push_back(D->HasSkippedBody);
625 
626   Record.push_back(D->IsRedeclaration);
627   Record.push_back(D->HasRedeclaration);
628   if (D->HasRedeclaration) {
629     assert(Context.getObjCMethodRedeclaration(D));
630     Writer.AddDeclRef(Context.getObjCMethodRedeclaration(D), Record);
631   }
632 
633   // FIXME: stable encoding for @required/@optional
634   Record.push_back(D->getImplementationControl());
635   // FIXME: stable encoding for in/out/inout/bycopy/byref/oneway/nullability
636   Record.push_back(D->getObjCDeclQualifier());
637   Record.push_back(D->hasRelatedResultType());
638   Writer.AddTypeRef(D->getReturnType(), Record);
639   Writer.AddTypeSourceInfo(D->getReturnTypeSourceInfo(), Record);
640   Writer.AddSourceLocation(D->getLocEnd(), Record);
641   Record.push_back(D->param_size());
642   for (const auto *P : D->params())
643     Writer.AddDeclRef(P, Record);
644 
645   Record.push_back(D->SelLocsKind);
646   unsigned NumStoredSelLocs = D->getNumStoredSelLocs();
647   SourceLocation *SelLocs = D->getStoredSelLocs();
648   Record.push_back(NumStoredSelLocs);
649   for (unsigned i = 0; i != NumStoredSelLocs; ++i)
650     Writer.AddSourceLocation(SelLocs[i], Record);
651 
652   Code = serialization::DECL_OBJC_METHOD;
653 }
654 
655 void ASTDeclWriter::VisitObjCTypeParamDecl(ObjCTypeParamDecl *D) {
656   VisitTypedefNameDecl(D);
657   Record.push_back(D->Variance);
658   Record.push_back(D->Index);
659   Writer.AddSourceLocation(D->VarianceLoc, Record);
660   Writer.AddSourceLocation(D->ColonLoc, Record);
661 
662   Code = serialization::DECL_OBJC_TYPE_PARAM;
663 }
664 
665 void ASTDeclWriter::VisitObjCContainerDecl(ObjCContainerDecl *D) {
666   VisitNamedDecl(D);
667   Writer.AddSourceLocation(D->getAtStartLoc(), Record);
668   Writer.AddSourceRange(D->getAtEndRange(), Record);
669   // Abstract class (no need to define a stable serialization::DECL code).
670 }
671 
672 void ASTDeclWriter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *D) {
673   VisitRedeclarable(D);
674   VisitObjCContainerDecl(D);
675   Writer.AddTypeRef(QualType(D->getTypeForDecl(), 0), Record);
676   AddObjCTypeParamList(D->TypeParamList);
677 
678   Record.push_back(D->isThisDeclarationADefinition());
679   if (D->isThisDeclarationADefinition()) {
680     // Write the DefinitionData
681     ObjCInterfaceDecl::DefinitionData &Data = D->data();
682 
683     Writer.AddTypeSourceInfo(D->getSuperClassTInfo(), Record);
684     Writer.AddSourceLocation(D->getEndOfDefinitionLoc(), Record);
685     Record.push_back(Data.HasDesignatedInitializers);
686 
687     // Write out the protocols that are directly referenced by the @interface.
688     Record.push_back(Data.ReferencedProtocols.size());
689     for (const auto *P : D->protocols())
690       Writer.AddDeclRef(P, Record);
691     for (const auto &PL : D->protocol_locs())
692       Writer.AddSourceLocation(PL, Record);
693 
694     // Write out the protocols that are transitively referenced.
695     Record.push_back(Data.AllReferencedProtocols.size());
696     for (ObjCList<ObjCProtocolDecl>::iterator
697               P = Data.AllReferencedProtocols.begin(),
698            PEnd = Data.AllReferencedProtocols.end();
699          P != PEnd; ++P)
700       Writer.AddDeclRef(*P, Record);
701 
702 
703     if (ObjCCategoryDecl *Cat = D->getCategoryListRaw()) {
704       // Ensure that we write out the set of categories for this class.
705       Writer.ObjCClassesWithCategories.insert(D);
706 
707       // Make sure that the categories get serialized.
708       for (; Cat; Cat = Cat->getNextClassCategoryRaw())
709         (void)Writer.GetDeclRef(Cat);
710     }
711   }
712 
713   Code = serialization::DECL_OBJC_INTERFACE;
714 }
715 
716 void ASTDeclWriter::VisitObjCIvarDecl(ObjCIvarDecl *D) {
717   VisitFieldDecl(D);
718   // FIXME: stable encoding for @public/@private/@protected/@package
719   Record.push_back(D->getAccessControl());
720   Record.push_back(D->getSynthesize());
721 
722   if (D->getDeclContext() == D->getLexicalDeclContext() &&
723       !D->hasAttrs() &&
724       !D->isImplicit() &&
725       !D->isUsed(false) &&
726       !D->isInvalidDecl() &&
727       !D->isReferenced() &&
728       !D->isModulePrivate() &&
729       !D->getBitWidth() &&
730       !D->hasExtInfo() &&
731       D->getDeclName())
732     AbbrevToUse = Writer.getDeclObjCIvarAbbrev();
733 
734   Code = serialization::DECL_OBJC_IVAR;
735 }
736 
737 void ASTDeclWriter::VisitObjCProtocolDecl(ObjCProtocolDecl *D) {
738   VisitRedeclarable(D);
739   VisitObjCContainerDecl(D);
740 
741   Record.push_back(D->isThisDeclarationADefinition());
742   if (D->isThisDeclarationADefinition()) {
743     Record.push_back(D->protocol_size());
744     for (const auto *I : D->protocols())
745       Writer.AddDeclRef(I, Record);
746     for (const auto &PL : D->protocol_locs())
747       Writer.AddSourceLocation(PL, Record);
748   }
749 
750   Code = serialization::DECL_OBJC_PROTOCOL;
751 }
752 
753 void ASTDeclWriter::VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D) {
754   VisitFieldDecl(D);
755   Code = serialization::DECL_OBJC_AT_DEFS_FIELD;
756 }
757 
758 void ASTDeclWriter::VisitObjCCategoryDecl(ObjCCategoryDecl *D) {
759   VisitObjCContainerDecl(D);
760   Writer.AddSourceLocation(D->getCategoryNameLoc(), Record);
761   Writer.AddSourceLocation(D->getIvarLBraceLoc(), Record);
762   Writer.AddSourceLocation(D->getIvarRBraceLoc(), Record);
763   Writer.AddDeclRef(D->getClassInterface(), Record);
764   AddObjCTypeParamList(D->TypeParamList);
765   Record.push_back(D->protocol_size());
766   for (const auto *I : D->protocols())
767     Writer.AddDeclRef(I, Record);
768   for (const auto &PL : D->protocol_locs())
769     Writer.AddSourceLocation(PL, Record);
770   Code = serialization::DECL_OBJC_CATEGORY;
771 }
772 
773 void ASTDeclWriter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D) {
774   VisitNamedDecl(D);
775   Writer.AddDeclRef(D->getClassInterface(), Record);
776   Code = serialization::DECL_OBJC_COMPATIBLE_ALIAS;
777 }
778 
779 void ASTDeclWriter::VisitObjCPropertyDecl(ObjCPropertyDecl *D) {
780   VisitNamedDecl(D);
781   Writer.AddSourceLocation(D->getAtLoc(), Record);
782   Writer.AddSourceLocation(D->getLParenLoc(), Record);
783   Writer.AddTypeRef(D->getType(), Record);
784   Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record);
785   // FIXME: stable encoding
786   Record.push_back((unsigned)D->getPropertyAttributes());
787   Record.push_back((unsigned)D->getPropertyAttributesAsWritten());
788   // FIXME: stable encoding
789   Record.push_back((unsigned)D->getPropertyImplementation());
790   Writer.AddDeclarationName(D->getGetterName(), Record);
791   Writer.AddDeclarationName(D->getSetterName(), Record);
792   Writer.AddDeclRef(D->getGetterMethodDecl(), Record);
793   Writer.AddDeclRef(D->getSetterMethodDecl(), Record);
794   Writer.AddDeclRef(D->getPropertyIvarDecl(), Record);
795   Code = serialization::DECL_OBJC_PROPERTY;
796 }
797 
798 void ASTDeclWriter::VisitObjCImplDecl(ObjCImplDecl *D) {
799   VisitObjCContainerDecl(D);
800   Writer.AddDeclRef(D->getClassInterface(), Record);
801   // Abstract class (no need to define a stable serialization::DECL code).
802 }
803 
804 void ASTDeclWriter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D) {
805   VisitObjCImplDecl(D);
806   Writer.AddIdentifierRef(D->getIdentifier(), Record);
807   Writer.AddSourceLocation(D->getCategoryNameLoc(), Record);
808   Code = serialization::DECL_OBJC_CATEGORY_IMPL;
809 }
810 
811 void ASTDeclWriter::VisitObjCImplementationDecl(ObjCImplementationDecl *D) {
812   VisitObjCImplDecl(D);
813   Writer.AddDeclRef(D->getSuperClass(), Record);
814   Writer.AddSourceLocation(D->getSuperClassLoc(), Record);
815   Writer.AddSourceLocation(D->getIvarLBraceLoc(), Record);
816   Writer.AddSourceLocation(D->getIvarRBraceLoc(), Record);
817   Record.push_back(D->hasNonZeroConstructors());
818   Record.push_back(D->hasDestructors());
819   Record.push_back(D->NumIvarInitializers);
820   if (D->NumIvarInitializers)
821     Writer.AddCXXCtorInitializersRef(
822         llvm::makeArrayRef(D->init_begin(), D->init_end()), Record);
823   Code = serialization::DECL_OBJC_IMPLEMENTATION;
824 }
825 
826 void ASTDeclWriter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D) {
827   VisitDecl(D);
828   Writer.AddSourceLocation(D->getLocStart(), Record);
829   Writer.AddDeclRef(D->getPropertyDecl(), Record);
830   Writer.AddDeclRef(D->getPropertyIvarDecl(), Record);
831   Writer.AddSourceLocation(D->getPropertyIvarDeclLoc(), Record);
832   Writer.AddStmt(D->getGetterCXXConstructor());
833   Writer.AddStmt(D->getSetterCXXAssignment());
834   Code = serialization::DECL_OBJC_PROPERTY_IMPL;
835 }
836 
837 void ASTDeclWriter::VisitFieldDecl(FieldDecl *D) {
838   VisitDeclaratorDecl(D);
839   Record.push_back(D->isMutable());
840   if (D->InitStorage.getInt() == FieldDecl::ISK_BitWidthOrNothing &&
841       D->InitStorage.getPointer() == nullptr) {
842     Record.push_back(0);
843   } else if (D->InitStorage.getInt() == FieldDecl::ISK_CapturedVLAType) {
844     Record.push_back(D->InitStorage.getInt() + 1);
845     Writer.AddTypeRef(
846         QualType(static_cast<Type *>(D->InitStorage.getPointer()), 0),
847         Record);
848   } else {
849     Record.push_back(D->InitStorage.getInt() + 1);
850     Writer.AddStmt(static_cast<Expr *>(D->InitStorage.getPointer()));
851   }
852   if (!D->getDeclName())
853     Writer.AddDeclRef(Context.getInstantiatedFromUnnamedFieldDecl(D), Record);
854 
855   if (D->getDeclContext() == D->getLexicalDeclContext() &&
856       !D->hasAttrs() &&
857       !D->isImplicit() &&
858       !D->isUsed(false) &&
859       !D->isInvalidDecl() &&
860       !D->isReferenced() &&
861       !D->isTopLevelDeclInObjCContainer() &&
862       !D->isModulePrivate() &&
863       !D->getBitWidth() &&
864       !D->hasInClassInitializer() &&
865       !D->hasExtInfo() &&
866       !ObjCIvarDecl::classofKind(D->getKind()) &&
867       !ObjCAtDefsFieldDecl::classofKind(D->getKind()) &&
868       D->getDeclName())
869     AbbrevToUse = Writer.getDeclFieldAbbrev();
870 
871   Code = serialization::DECL_FIELD;
872 }
873 
874 void ASTDeclWriter::VisitMSPropertyDecl(MSPropertyDecl *D) {
875   VisitDeclaratorDecl(D);
876   Writer.AddIdentifierRef(D->getGetterId(), Record);
877   Writer.AddIdentifierRef(D->getSetterId(), Record);
878   Code = serialization::DECL_MS_PROPERTY;
879 }
880 
881 void ASTDeclWriter::VisitIndirectFieldDecl(IndirectFieldDecl *D) {
882   VisitValueDecl(D);
883   Record.push_back(D->getChainingSize());
884 
885   for (const auto *P : D->chain())
886     Writer.AddDeclRef(P, Record);
887   Code = serialization::DECL_INDIRECTFIELD;
888 }
889 
890 void ASTDeclWriter::VisitVarDecl(VarDecl *D) {
891   VisitRedeclarable(D);
892   VisitDeclaratorDecl(D);
893   Record.push_back(D->getStorageClass());
894   Record.push_back(D->getTSCSpec());
895   Record.push_back(D->getInitStyle());
896   if (!isa<ParmVarDecl>(D)) {
897     Record.push_back(D->isExceptionVariable());
898     Record.push_back(D->isNRVOVariable());
899     Record.push_back(D->isCXXForRangeDecl());
900     Record.push_back(D->isARCPseudoStrong());
901     Record.push_back(D->isConstexpr());
902     Record.push_back(D->isInitCapture());
903     Record.push_back(D->isPreviousDeclInSameBlockScope());
904   }
905   Record.push_back(D->getLinkageInternal());
906 
907   if (D->getInit()) {
908     Record.push_back(!D->isInitKnownICE() ? 1 : (D->isInitICE() ? 3 : 2));
909     Writer.AddStmt(D->getInit());
910   } else {
911     Record.push_back(0);
912   }
913 
914   enum {
915     VarNotTemplate = 0, VarTemplate, StaticDataMemberSpecialization
916   };
917   if (VarTemplateDecl *TemplD = D->getDescribedVarTemplate()) {
918     Record.push_back(VarTemplate);
919     Writer.AddDeclRef(TemplD, Record);
920   } else if (MemberSpecializationInfo *SpecInfo
921                = D->getMemberSpecializationInfo()) {
922     Record.push_back(StaticDataMemberSpecialization);
923     Writer.AddDeclRef(SpecInfo->getInstantiatedFrom(), Record);
924     Record.push_back(SpecInfo->getTemplateSpecializationKind());
925     Writer.AddSourceLocation(SpecInfo->getPointOfInstantiation(), Record);
926   } else {
927     Record.push_back(VarNotTemplate);
928   }
929 
930   if (D->getDeclContext() == D->getLexicalDeclContext() &&
931       !D->hasAttrs() &&
932       !D->isImplicit() &&
933       !D->isUsed(false) &&
934       !D->isInvalidDecl() &&
935       !D->isReferenced() &&
936       !D->isTopLevelDeclInObjCContainer() &&
937       D->getAccess() == AS_none &&
938       !D->isModulePrivate() &&
939       !needsAnonymousDeclarationNumber(D) &&
940       D->getDeclName().getNameKind() == DeclarationName::Identifier &&
941       !D->hasExtInfo() &&
942       D->getFirstDecl() == D->getMostRecentDecl() &&
943       D->getInitStyle() == VarDecl::CInit &&
944       D->getInit() == nullptr &&
945       !isa<ParmVarDecl>(D) &&
946       !isa<VarTemplateSpecializationDecl>(D) &&
947       !D->isConstexpr() &&
948       !D->isInitCapture() &&
949       !D->isPreviousDeclInSameBlockScope() &&
950       !D->getMemberSpecializationInfo())
951     AbbrevToUse = Writer.getDeclVarAbbrev();
952 
953   Code = serialization::DECL_VAR;
954 }
955 
956 void ASTDeclWriter::VisitImplicitParamDecl(ImplicitParamDecl *D) {
957   VisitVarDecl(D);
958   Code = serialization::DECL_IMPLICIT_PARAM;
959 }
960 
961 void ASTDeclWriter::VisitParmVarDecl(ParmVarDecl *D) {
962   VisitVarDecl(D);
963   Record.push_back(D->isObjCMethodParameter());
964   Record.push_back(D->getFunctionScopeDepth());
965   Record.push_back(D->getFunctionScopeIndex());
966   Record.push_back(D->getObjCDeclQualifier()); // FIXME: stable encoding
967   Record.push_back(D->isKNRPromoted());
968   Record.push_back(D->hasInheritedDefaultArg());
969   Record.push_back(D->hasUninstantiatedDefaultArg());
970   if (D->hasUninstantiatedDefaultArg())
971     Writer.AddStmt(D->getUninstantiatedDefaultArg());
972   Code = serialization::DECL_PARM_VAR;
973 
974   assert(!D->isARCPseudoStrong()); // can be true of ImplicitParamDecl
975 
976   // If the assumptions about the DECL_PARM_VAR abbrev are true, use it.  Here
977   // we dynamically check for the properties that we optimize for, but don't
978   // know are true of all PARM_VAR_DECLs.
979   if (D->getDeclContext() == D->getLexicalDeclContext() &&
980       !D->hasAttrs() &&
981       !D->hasExtInfo() &&
982       !D->isImplicit() &&
983       !D->isUsed(false) &&
984       !D->isInvalidDecl() &&
985       !D->isReferenced() &&
986       D->getAccess() == AS_none &&
987       !D->isModulePrivate() &&
988       D->getStorageClass() == 0 &&
989       D->getInitStyle() == VarDecl::CInit && // Can params have anything else?
990       D->getFunctionScopeDepth() == 0 &&
991       D->getObjCDeclQualifier() == 0 &&
992       !D->isKNRPromoted() &&
993       !D->hasInheritedDefaultArg() &&
994       D->getInit() == nullptr &&
995       !D->hasUninstantiatedDefaultArg())  // No default expr.
996     AbbrevToUse = Writer.getDeclParmVarAbbrev();
997 
998   // Check things we know are true of *every* PARM_VAR_DECL, which is more than
999   // just us assuming it.
1000   assert(!D->getTSCSpec() && "PARM_VAR_DECL can't use TLS");
1001   assert(D->getAccess() == AS_none && "PARM_VAR_DECL can't be public/private");
1002   assert(!D->isExceptionVariable() && "PARM_VAR_DECL can't be exception var");
1003   assert(D->getPreviousDecl() == nullptr && "PARM_VAR_DECL can't be redecl");
1004   assert(!D->isStaticDataMember() &&
1005          "PARM_VAR_DECL can't be static data member");
1006 }
1007 
1008 void ASTDeclWriter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
1009   VisitDecl(D);
1010   Writer.AddStmt(D->getAsmString());
1011   Writer.AddSourceLocation(D->getRParenLoc(), Record);
1012   Code = serialization::DECL_FILE_SCOPE_ASM;
1013 }
1014 
1015 void ASTDeclWriter::VisitEmptyDecl(EmptyDecl *D) {
1016   VisitDecl(D);
1017   Code = serialization::DECL_EMPTY;
1018 }
1019 
1020 void ASTDeclWriter::VisitBlockDecl(BlockDecl *D) {
1021   VisitDecl(D);
1022   Writer.AddStmt(D->getBody());
1023   Writer.AddTypeSourceInfo(D->getSignatureAsWritten(), Record);
1024   Record.push_back(D->param_size());
1025   for (FunctionDecl::param_iterator P = D->param_begin(), PEnd = D->param_end();
1026        P != PEnd; ++P)
1027     Writer.AddDeclRef(*P, Record);
1028   Record.push_back(D->isVariadic());
1029   Record.push_back(D->blockMissingReturnType());
1030   Record.push_back(D->isConversionFromLambda());
1031   Record.push_back(D->capturesCXXThis());
1032   Record.push_back(D->getNumCaptures());
1033   for (const auto &capture : D->captures()) {
1034     Writer.AddDeclRef(capture.getVariable(), Record);
1035 
1036     unsigned flags = 0;
1037     if (capture.isByRef()) flags |= 1;
1038     if (capture.isNested()) flags |= 2;
1039     if (capture.hasCopyExpr()) flags |= 4;
1040     Record.push_back(flags);
1041 
1042     if (capture.hasCopyExpr()) Writer.AddStmt(capture.getCopyExpr());
1043   }
1044 
1045   Code = serialization::DECL_BLOCK;
1046 }
1047 
1048 void ASTDeclWriter::VisitCapturedDecl(CapturedDecl *CD) {
1049   Record.push_back(CD->getNumParams());
1050   VisitDecl(CD);
1051   Record.push_back(CD->getContextParamPosition());
1052   Record.push_back(CD->isNothrow() ? 1 : 0);
1053   // Body is stored by VisitCapturedStmt.
1054   for (unsigned I = 0; I < CD->getNumParams(); ++I)
1055     Writer.AddDeclRef(CD->getParam(I), Record);
1056   Code = serialization::DECL_CAPTURED;
1057 }
1058 
1059 void ASTDeclWriter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
1060   VisitDecl(D);
1061   Record.push_back(D->getLanguage());
1062   Writer.AddSourceLocation(D->getExternLoc(), Record);
1063   Writer.AddSourceLocation(D->getRBraceLoc(), Record);
1064   Code = serialization::DECL_LINKAGE_SPEC;
1065 }
1066 
1067 void ASTDeclWriter::VisitLabelDecl(LabelDecl *D) {
1068   VisitNamedDecl(D);
1069   Writer.AddSourceLocation(D->getLocStart(), Record);
1070   Code = serialization::DECL_LABEL;
1071 }
1072 
1073 
1074 void ASTDeclWriter::VisitNamespaceDecl(NamespaceDecl *D) {
1075   VisitRedeclarable(D);
1076   VisitNamedDecl(D);
1077   Record.push_back(D->isInline());
1078   Writer.AddSourceLocation(D->getLocStart(), Record);
1079   Writer.AddSourceLocation(D->getRBraceLoc(), Record);
1080 
1081   if (D->isOriginalNamespace())
1082     Writer.AddDeclRef(D->getAnonymousNamespace(), Record);
1083   Code = serialization::DECL_NAMESPACE;
1084 
1085   if (Writer.hasChain() && D->isAnonymousNamespace() &&
1086       D == D->getMostRecentDecl()) {
1087     // This is a most recent reopening of the anonymous namespace. If its parent
1088     // is in a previous PCH (or is the TU), mark that parent for update, because
1089     // the original namespace always points to the latest re-opening of its
1090     // anonymous namespace.
1091     Decl *Parent = cast<Decl>(
1092         D->getParent()->getRedeclContext()->getPrimaryContext());
1093     if (Parent->isFromASTFile() || isa<TranslationUnitDecl>(Parent)) {
1094       Writer.DeclUpdates[Parent].push_back(
1095           ASTWriter::DeclUpdate(UPD_CXX_ADDED_ANONYMOUS_NAMESPACE, D));
1096     }
1097   }
1098 }
1099 
1100 void ASTDeclWriter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
1101   VisitRedeclarable(D);
1102   VisitNamedDecl(D);
1103   Writer.AddSourceLocation(D->getNamespaceLoc(), Record);
1104   Writer.AddSourceLocation(D->getTargetNameLoc(), Record);
1105   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
1106   Writer.AddDeclRef(D->getNamespace(), Record);
1107   Code = serialization::DECL_NAMESPACE_ALIAS;
1108 }
1109 
1110 void ASTDeclWriter::VisitUsingDecl(UsingDecl *D) {
1111   VisitNamedDecl(D);
1112   Writer.AddSourceLocation(D->getUsingLoc(), Record);
1113   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
1114   Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
1115   Writer.AddDeclRef(D->FirstUsingShadow.getPointer(), Record);
1116   Record.push_back(D->hasTypename());
1117   Writer.AddDeclRef(Context.getInstantiatedFromUsingDecl(D), Record);
1118   Code = serialization::DECL_USING;
1119 }
1120 
1121 void ASTDeclWriter::VisitUsingShadowDecl(UsingShadowDecl *D) {
1122   VisitRedeclarable(D);
1123   VisitNamedDecl(D);
1124   Writer.AddDeclRef(D->getTargetDecl(), Record);
1125   Writer.AddDeclRef(D->UsingOrNextShadow, Record);
1126   Writer.AddDeclRef(Context.getInstantiatedFromUsingShadowDecl(D), Record);
1127   Code = serialization::DECL_USING_SHADOW;
1128 }
1129 
1130 void ASTDeclWriter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
1131   VisitNamedDecl(D);
1132   Writer.AddSourceLocation(D->getUsingLoc(), Record);
1133   Writer.AddSourceLocation(D->getNamespaceKeyLocation(), Record);
1134   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
1135   Writer.AddDeclRef(D->getNominatedNamespace(), Record);
1136   Writer.AddDeclRef(dyn_cast<Decl>(D->getCommonAncestor()), Record);
1137   Code = serialization::DECL_USING_DIRECTIVE;
1138 }
1139 
1140 void ASTDeclWriter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
1141   VisitValueDecl(D);
1142   Writer.AddSourceLocation(D->getUsingLoc(), Record);
1143   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
1144   Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
1145   Code = serialization::DECL_UNRESOLVED_USING_VALUE;
1146 }
1147 
1148 void ASTDeclWriter::VisitUnresolvedUsingTypenameDecl(
1149                                                UnresolvedUsingTypenameDecl *D) {
1150   VisitTypeDecl(D);
1151   Writer.AddSourceLocation(D->getTypenameLoc(), Record);
1152   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
1153   Code = serialization::DECL_UNRESOLVED_USING_TYPENAME;
1154 }
1155 
1156 void ASTDeclWriter::VisitCXXRecordDecl(CXXRecordDecl *D) {
1157   VisitRecordDecl(D);
1158 
1159   enum {
1160     CXXRecNotTemplate = 0, CXXRecTemplate, CXXRecMemberSpecialization
1161   };
1162   if (ClassTemplateDecl *TemplD = D->getDescribedClassTemplate()) {
1163     Record.push_back(CXXRecTemplate);
1164     Writer.AddDeclRef(TemplD, Record);
1165   } else if (MemberSpecializationInfo *MSInfo
1166                = D->getMemberSpecializationInfo()) {
1167     Record.push_back(CXXRecMemberSpecialization);
1168     Writer.AddDeclRef(MSInfo->getInstantiatedFrom(), Record);
1169     Record.push_back(MSInfo->getTemplateSpecializationKind());
1170     Writer.AddSourceLocation(MSInfo->getPointOfInstantiation(), Record);
1171   } else {
1172     Record.push_back(CXXRecNotTemplate);
1173   }
1174 
1175   Record.push_back(D->isThisDeclarationADefinition());
1176   if (D->isThisDeclarationADefinition())
1177     Writer.AddCXXDefinitionData(D, Record);
1178 
1179   // Store (what we currently believe to be) the key function to avoid
1180   // deserializing every method so we can compute it.
1181   if (D->IsCompleteDefinition)
1182     Writer.AddDeclRef(Context.getCurrentKeyFunction(D), Record);
1183 
1184   Code = serialization::DECL_CXX_RECORD;
1185 }
1186 
1187 void ASTDeclWriter::VisitCXXMethodDecl(CXXMethodDecl *D) {
1188   VisitFunctionDecl(D);
1189   if (D->isCanonicalDecl()) {
1190     Record.push_back(D->size_overridden_methods());
1191     for (CXXMethodDecl::method_iterator
1192            I = D->begin_overridden_methods(), E = D->end_overridden_methods();
1193            I != E; ++I)
1194       Writer.AddDeclRef(*I, Record);
1195   } else {
1196     // We only need to record overridden methods once for the canonical decl.
1197     Record.push_back(0);
1198   }
1199 
1200   if (D->getDeclContext() == D->getLexicalDeclContext() &&
1201       D->getFirstDecl() == D->getMostRecentDecl() &&
1202       !D->isInvalidDecl() &&
1203       !D->hasAttrs() &&
1204       !D->isTopLevelDeclInObjCContainer() &&
1205       D->getDeclName().getNameKind() == DeclarationName::Identifier &&
1206       !D->hasExtInfo() &&
1207       !D->hasInheritedPrototype() &&
1208       D->hasWrittenPrototype())
1209     AbbrevToUse = Writer.getDeclCXXMethodAbbrev();
1210 
1211   Code = serialization::DECL_CXX_METHOD;
1212 }
1213 
1214 void ASTDeclWriter::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
1215   VisitCXXMethodDecl(D);
1216 
1217   Writer.AddDeclRef(D->getInheritedConstructor(), Record);
1218   Record.push_back(D->IsExplicitSpecified);
1219 
1220   Code = serialization::DECL_CXX_CONSTRUCTOR;
1221 }
1222 
1223 void ASTDeclWriter::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
1224   VisitCXXMethodDecl(D);
1225 
1226   Writer.AddDeclRef(D->getOperatorDelete(), Record);
1227 
1228   Code = serialization::DECL_CXX_DESTRUCTOR;
1229 }
1230 
1231 void ASTDeclWriter::VisitCXXConversionDecl(CXXConversionDecl *D) {
1232   VisitCXXMethodDecl(D);
1233   Record.push_back(D->IsExplicitSpecified);
1234   Code = serialization::DECL_CXX_CONVERSION;
1235 }
1236 
1237 void ASTDeclWriter::VisitImportDecl(ImportDecl *D) {
1238   VisitDecl(D);
1239   Record.push_back(Writer.getSubmoduleID(D->getImportedModule()));
1240   ArrayRef<SourceLocation> IdentifierLocs = D->getIdentifierLocs();
1241   Record.push_back(!IdentifierLocs.empty());
1242   if (IdentifierLocs.empty()) {
1243     Writer.AddSourceLocation(D->getLocEnd(), Record);
1244     Record.push_back(1);
1245   } else {
1246     for (unsigned I = 0, N = IdentifierLocs.size(); I != N; ++I)
1247       Writer.AddSourceLocation(IdentifierLocs[I], Record);
1248     Record.push_back(IdentifierLocs.size());
1249   }
1250   // Note: the number of source locations must always be the last element in
1251   // the record.
1252   Code = serialization::DECL_IMPORT;
1253 }
1254 
1255 void ASTDeclWriter::VisitAccessSpecDecl(AccessSpecDecl *D) {
1256   VisitDecl(D);
1257   Writer.AddSourceLocation(D->getColonLoc(), Record);
1258   Code = serialization::DECL_ACCESS_SPEC;
1259 }
1260 
1261 void ASTDeclWriter::VisitFriendDecl(FriendDecl *D) {
1262   // Record the number of friend type template parameter lists here
1263   // so as to simplify memory allocation during deserialization.
1264   Record.push_back(D->NumTPLists);
1265   VisitDecl(D);
1266   bool hasFriendDecl = D->Friend.is<NamedDecl*>();
1267   Record.push_back(hasFriendDecl);
1268   if (hasFriendDecl)
1269     Writer.AddDeclRef(D->getFriendDecl(), Record);
1270   else
1271     Writer.AddTypeSourceInfo(D->getFriendType(), Record);
1272   for (unsigned i = 0; i < D->NumTPLists; ++i)
1273     Writer.AddTemplateParameterList(D->getFriendTypeTemplateParameterList(i),
1274                                     Record);
1275   Writer.AddDeclRef(D->getNextFriend(), Record);
1276   Record.push_back(D->UnsupportedFriend);
1277   Writer.AddSourceLocation(D->FriendLoc, Record);
1278   Code = serialization::DECL_FRIEND;
1279 }
1280 
1281 void ASTDeclWriter::VisitFriendTemplateDecl(FriendTemplateDecl *D) {
1282   VisitDecl(D);
1283   Record.push_back(D->getNumTemplateParameters());
1284   for (unsigned i = 0, e = D->getNumTemplateParameters(); i != e; ++i)
1285     Writer.AddTemplateParameterList(D->getTemplateParameterList(i), Record);
1286   Record.push_back(D->getFriendDecl() != nullptr);
1287   if (D->getFriendDecl())
1288     Writer.AddDeclRef(D->getFriendDecl(), Record);
1289   else
1290     Writer.AddTypeSourceInfo(D->getFriendType(), Record);
1291   Writer.AddSourceLocation(D->getFriendLoc(), Record);
1292   Code = serialization::DECL_FRIEND_TEMPLATE;
1293 }
1294 
1295 void ASTDeclWriter::VisitTemplateDecl(TemplateDecl *D) {
1296   VisitNamedDecl(D);
1297 
1298   Writer.AddDeclRef(D->getTemplatedDecl(), Record);
1299   Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1300 }
1301 
1302 void ASTDeclWriter::VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D) {
1303   VisitRedeclarable(D);
1304 
1305   // Emit data to initialize CommonOrPrev before VisitTemplateDecl so that
1306   // getCommonPtr() can be used while this is still initializing.
1307   if (D->isFirstDecl()) {
1308     // This declaration owns the 'common' pointer, so serialize that data now.
1309     Writer.AddDeclRef(D->getInstantiatedFromMemberTemplate(), Record);
1310     if (D->getInstantiatedFromMemberTemplate())
1311       Record.push_back(D->isMemberSpecialization());
1312   }
1313 
1314   VisitTemplateDecl(D);
1315   Record.push_back(D->getIdentifierNamespace());
1316 }
1317 
1318 void ASTDeclWriter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1319   VisitRedeclarableTemplateDecl(D);
1320 
1321   if (D->isFirstDecl())
1322     AddTemplateSpecializations(D);
1323   Code = serialization::DECL_CLASS_TEMPLATE;
1324 }
1325 
1326 void ASTDeclWriter::VisitClassTemplateSpecializationDecl(
1327                                            ClassTemplateSpecializationDecl *D) {
1328   RegisterTemplateSpecialization(D->getSpecializedTemplate(), D);
1329 
1330   VisitCXXRecordDecl(D);
1331 
1332   llvm::PointerUnion<ClassTemplateDecl *,
1333                      ClassTemplatePartialSpecializationDecl *> InstFrom
1334     = D->getSpecializedTemplateOrPartial();
1335   if (Decl *InstFromD = InstFrom.dyn_cast<ClassTemplateDecl *>()) {
1336     Writer.AddDeclRef(InstFromD, Record);
1337   } else {
1338     Writer.AddDeclRef(InstFrom.get<ClassTemplatePartialSpecializationDecl *>(),
1339                       Record);
1340     Writer.AddTemplateArgumentList(&D->getTemplateInstantiationArgs(), Record);
1341   }
1342 
1343   Writer.AddTemplateArgumentList(&D->getTemplateArgs(), Record);
1344   Writer.AddSourceLocation(D->getPointOfInstantiation(), Record);
1345   Record.push_back(D->getSpecializationKind());
1346   Record.push_back(D->isCanonicalDecl());
1347 
1348   if (D->isCanonicalDecl()) {
1349     // When reading, we'll add it to the folding set of the following template.
1350     Writer.AddDeclRef(D->getSpecializedTemplate()->getCanonicalDecl(), Record);
1351   }
1352 
1353   // Explicit info.
1354   Writer.AddTypeSourceInfo(D->getTypeAsWritten(), Record);
1355   if (D->getTypeAsWritten()) {
1356     Writer.AddSourceLocation(D->getExternLoc(), Record);
1357     Writer.AddSourceLocation(D->getTemplateKeywordLoc(), Record);
1358   }
1359 
1360   Code = serialization::DECL_CLASS_TEMPLATE_SPECIALIZATION;
1361 }
1362 
1363 void ASTDeclWriter::VisitClassTemplatePartialSpecializationDecl(
1364                                     ClassTemplatePartialSpecializationDecl *D) {
1365   VisitClassTemplateSpecializationDecl(D);
1366 
1367   Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1368   Writer.AddASTTemplateArgumentListInfo(D->getTemplateArgsAsWritten(), Record);
1369 
1370   // These are read/set from/to the first declaration.
1371   if (D->getPreviousDecl() == nullptr) {
1372     Writer.AddDeclRef(D->getInstantiatedFromMember(), Record);
1373     Record.push_back(D->isMemberSpecialization());
1374   }
1375 
1376   Code = serialization::DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION;
1377 }
1378 
1379 void ASTDeclWriter::VisitVarTemplateDecl(VarTemplateDecl *D) {
1380   VisitRedeclarableTemplateDecl(D);
1381 
1382   if (D->isFirstDecl())
1383     AddTemplateSpecializations(D);
1384   Code = serialization::DECL_VAR_TEMPLATE;
1385 }
1386 
1387 void ASTDeclWriter::VisitVarTemplateSpecializationDecl(
1388     VarTemplateSpecializationDecl *D) {
1389   RegisterTemplateSpecialization(D->getSpecializedTemplate(), D);
1390 
1391   VisitVarDecl(D);
1392 
1393   llvm::PointerUnion<VarTemplateDecl *, VarTemplatePartialSpecializationDecl *>
1394   InstFrom = D->getSpecializedTemplateOrPartial();
1395   if (Decl *InstFromD = InstFrom.dyn_cast<VarTemplateDecl *>()) {
1396     Writer.AddDeclRef(InstFromD, Record);
1397   } else {
1398     Writer.AddDeclRef(InstFrom.get<VarTemplatePartialSpecializationDecl *>(),
1399                       Record);
1400     Writer.AddTemplateArgumentList(&D->getTemplateInstantiationArgs(), Record);
1401   }
1402 
1403   // Explicit info.
1404   Writer.AddTypeSourceInfo(D->getTypeAsWritten(), Record);
1405   if (D->getTypeAsWritten()) {
1406     Writer.AddSourceLocation(D->getExternLoc(), Record);
1407     Writer.AddSourceLocation(D->getTemplateKeywordLoc(), Record);
1408   }
1409 
1410   Writer.AddTemplateArgumentList(&D->getTemplateArgs(), Record);
1411   Writer.AddSourceLocation(D->getPointOfInstantiation(), Record);
1412   Record.push_back(D->getSpecializationKind());
1413   Record.push_back(D->isCanonicalDecl());
1414 
1415   if (D->isCanonicalDecl()) {
1416     // When reading, we'll add it to the folding set of the following template.
1417     Writer.AddDeclRef(D->getSpecializedTemplate()->getCanonicalDecl(), Record);
1418   }
1419 
1420   Code = serialization::DECL_VAR_TEMPLATE_SPECIALIZATION;
1421 }
1422 
1423 void ASTDeclWriter::VisitVarTemplatePartialSpecializationDecl(
1424     VarTemplatePartialSpecializationDecl *D) {
1425   VisitVarTemplateSpecializationDecl(D);
1426 
1427   Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1428   Writer.AddASTTemplateArgumentListInfo(D->getTemplateArgsAsWritten(), Record);
1429 
1430   // These are read/set from/to the first declaration.
1431   if (D->getPreviousDecl() == nullptr) {
1432     Writer.AddDeclRef(D->getInstantiatedFromMember(), Record);
1433     Record.push_back(D->isMemberSpecialization());
1434   }
1435 
1436   Code = serialization::DECL_VAR_TEMPLATE_PARTIAL_SPECIALIZATION;
1437 }
1438 
1439 void ASTDeclWriter::VisitClassScopeFunctionSpecializationDecl(
1440                                     ClassScopeFunctionSpecializationDecl *D) {
1441   VisitDecl(D);
1442   Writer.AddDeclRef(D->getSpecialization(), Record);
1443   Code = serialization::DECL_CLASS_SCOPE_FUNCTION_SPECIALIZATION;
1444 }
1445 
1446 
1447 void ASTDeclWriter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1448   VisitRedeclarableTemplateDecl(D);
1449 
1450   if (D->isFirstDecl())
1451     AddTemplateSpecializations(D);
1452   Code = serialization::DECL_FUNCTION_TEMPLATE;
1453 }
1454 
1455 void ASTDeclWriter::VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D) {
1456   VisitTypeDecl(D);
1457 
1458   Record.push_back(D->wasDeclaredWithTypename());
1459 
1460   bool OwnsDefaultArg = D->hasDefaultArgument() &&
1461                         !D->defaultArgumentWasInherited();
1462   Record.push_back(OwnsDefaultArg);
1463   if (OwnsDefaultArg)
1464     Writer.AddTypeSourceInfo(D->getDefaultArgumentInfo(), Record);
1465 
1466   Code = serialization::DECL_TEMPLATE_TYPE_PARM;
1467 }
1468 
1469 void ASTDeclWriter::VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {
1470   // For an expanded parameter pack, record the number of expansion types here
1471   // so that it's easier for deserialization to allocate the right amount of
1472   // memory.
1473   if (D->isExpandedParameterPack())
1474     Record.push_back(D->getNumExpansionTypes());
1475 
1476   VisitDeclaratorDecl(D);
1477   // TemplateParmPosition.
1478   Record.push_back(D->getDepth());
1479   Record.push_back(D->getPosition());
1480 
1481   if (D->isExpandedParameterPack()) {
1482     for (unsigned I = 0, N = D->getNumExpansionTypes(); I != N; ++I) {
1483       Writer.AddTypeRef(D->getExpansionType(I), Record);
1484       Writer.AddTypeSourceInfo(D->getExpansionTypeSourceInfo(I), Record);
1485     }
1486 
1487     Code = serialization::DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK;
1488   } else {
1489     // Rest of NonTypeTemplateParmDecl.
1490     Record.push_back(D->isParameterPack());
1491     bool OwnsDefaultArg = D->hasDefaultArgument() &&
1492                           !D->defaultArgumentWasInherited();
1493     Record.push_back(OwnsDefaultArg);
1494     if (OwnsDefaultArg)
1495       Writer.AddStmt(D->getDefaultArgument());
1496     Code = serialization::DECL_NON_TYPE_TEMPLATE_PARM;
1497   }
1498 }
1499 
1500 void ASTDeclWriter::VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D) {
1501   // For an expanded parameter pack, record the number of expansion types here
1502   // so that it's easier for deserialization to allocate the right amount of
1503   // memory.
1504   if (D->isExpandedParameterPack())
1505     Record.push_back(D->getNumExpansionTemplateParameters());
1506 
1507   VisitTemplateDecl(D);
1508   // TemplateParmPosition.
1509   Record.push_back(D->getDepth());
1510   Record.push_back(D->getPosition());
1511 
1512   if (D->isExpandedParameterPack()) {
1513     for (unsigned I = 0, N = D->getNumExpansionTemplateParameters();
1514          I != N; ++I)
1515       Writer.AddTemplateParameterList(D->getExpansionTemplateParameters(I),
1516                                       Record);
1517     Code = serialization::DECL_EXPANDED_TEMPLATE_TEMPLATE_PARM_PACK;
1518   } else {
1519     // Rest of TemplateTemplateParmDecl.
1520     Record.push_back(D->isParameterPack());
1521     bool OwnsDefaultArg = D->hasDefaultArgument() &&
1522                           !D->defaultArgumentWasInherited();
1523     Record.push_back(OwnsDefaultArg);
1524     if (OwnsDefaultArg)
1525       Writer.AddTemplateArgumentLoc(D->getDefaultArgument(), Record);
1526     Code = serialization::DECL_TEMPLATE_TEMPLATE_PARM;
1527   }
1528 }
1529 
1530 void ASTDeclWriter::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) {
1531   VisitRedeclarableTemplateDecl(D);
1532   Code = serialization::DECL_TYPE_ALIAS_TEMPLATE;
1533 }
1534 
1535 void ASTDeclWriter::VisitStaticAssertDecl(StaticAssertDecl *D) {
1536   VisitDecl(D);
1537   Writer.AddStmt(D->getAssertExpr());
1538   Record.push_back(D->isFailed());
1539   Writer.AddStmt(D->getMessage());
1540   Writer.AddSourceLocation(D->getRParenLoc(), Record);
1541   Code = serialization::DECL_STATIC_ASSERT;
1542 }
1543 
1544 /// \brief Emit the DeclContext part of a declaration context decl.
1545 ///
1546 /// \param LexicalOffset the offset at which the DECL_CONTEXT_LEXICAL
1547 /// block for this declaration context is stored. May be 0 to indicate
1548 /// that there are no declarations stored within this context.
1549 ///
1550 /// \param VisibleOffset the offset at which the DECL_CONTEXT_VISIBLE
1551 /// block for this declaration context is stored. May be 0 to indicate
1552 /// that there are no declarations visible from this context. Note
1553 /// that this value will not be emitted for non-primary declaration
1554 /// contexts.
1555 void ASTDeclWriter::VisitDeclContext(DeclContext *DC, uint64_t LexicalOffset,
1556                                      uint64_t VisibleOffset) {
1557   Record.push_back(LexicalOffset);
1558   Record.push_back(VisibleOffset);
1559 }
1560 
1561 const Decl *ASTWriter::getFirstLocalDecl(const Decl *D) {
1562   /// \brief Is this a local declaration (that is, one that will be written to
1563   /// our AST file)? This is the case for declarations that are neither imported
1564   /// from another AST file nor predefined.
1565   auto IsLocalDecl = [&](const Decl *D) -> bool {
1566     if (D->isFromASTFile())
1567       return false;
1568     auto I = DeclIDs.find(D);
1569     return (I == DeclIDs.end() || I->second >= NUM_PREDEF_DECL_IDS);
1570   };
1571 
1572   assert(IsLocalDecl(D) && "expected a local declaration");
1573 
1574   const Decl *Canon = D->getCanonicalDecl();
1575   if (IsLocalDecl(Canon))
1576     return Canon;
1577 
1578   const Decl *&CacheEntry = FirstLocalDeclCache[Canon];
1579   if (CacheEntry)
1580     return CacheEntry;
1581 
1582   for (const Decl *Redecl = D; Redecl; Redecl = Redecl->getPreviousDecl())
1583     if (IsLocalDecl(Redecl))
1584       D = Redecl;
1585   return CacheEntry = D;
1586 }
1587 
1588 template <typename T>
1589 void ASTDeclWriter::VisitRedeclarable(Redeclarable<T> *D) {
1590   T *First = D->getFirstDecl();
1591   T *MostRecent = First->getMostRecentDecl();
1592   T *DAsT = static_cast<T *>(D);
1593   if (MostRecent != First) {
1594     assert(isRedeclarableDeclKind(DAsT->getKind()) &&
1595            "Not considered redeclarable?");
1596 
1597     Writer.AddDeclRef(First, Record);
1598 
1599     // Write out a list of local redeclarations of this declaration if it's the
1600     // first local declaration in the chain.
1601     const Decl *FirstLocal = Writer.getFirstLocalDecl(DAsT);
1602     if (DAsT == FirstLocal) {
1603       // Emit a list of all imported first declarations so that we can be sure
1604       // that all redeclarations visible to this module are before D in the
1605       // redecl chain.
1606       unsigned I = Record.size();
1607       Record.push_back(0);
1608       if (Writer.Chain)
1609         AddFirstDeclFromEachModule(DAsT, /*IncludeLocal*/false);
1610       // This is the number of imported first declarations + 1.
1611       Record[I] = Record.size() - I;
1612 
1613       // Collect the set of local redeclarations of this declaration, from
1614       // newest to oldest.
1615       RecordData LocalRedecls;
1616       for (const Decl *Prev = FirstLocal->getMostRecentDecl();
1617            Prev != FirstLocal; Prev = Prev->getPreviousDecl())
1618         if (!Prev->isFromASTFile())
1619           Writer.AddDeclRef(Prev, LocalRedecls);
1620 
1621       // If we have any redecls, write them now as a separate record preceding
1622       // the declaration itself.
1623       if (LocalRedecls.empty())
1624         Record.push_back(0);
1625       else {
1626         Record.push_back(Writer.Stream.GetCurrentBitNo());
1627         Writer.Stream.EmitRecord(LOCAL_REDECLARATIONS, LocalRedecls);
1628       }
1629     } else {
1630       Record.push_back(0);
1631       Writer.AddDeclRef(FirstLocal, Record);
1632     }
1633 
1634     // Make sure that we serialize both the previous and the most-recent
1635     // declarations, which (transitively) ensures that all declarations in the
1636     // chain get serialized.
1637     //
1638     // FIXME: This is not correct; when we reach an imported declaration we
1639     // won't emit its previous declaration.
1640     (void)Writer.GetDeclRef(D->getPreviousDecl());
1641     (void)Writer.GetDeclRef(MostRecent);
1642   } else {
1643     // We use the sentinel value 0 to indicate an only declaration.
1644     Record.push_back(0);
1645   }
1646 }
1647 
1648 void ASTDeclWriter::VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D) {
1649   Record.push_back(D->varlist_size());
1650   VisitDecl(D);
1651   for (auto *I : D->varlists())
1652     Writer.AddStmt(I);
1653   Code = serialization::DECL_OMP_THREADPRIVATE;
1654 }
1655 
1656 void ASTDeclWriter::VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D) {
1657   VisitVarDecl(D);
1658   Code = serialization::DECL_OMP_CAPTUREDEXPR;
1659 }
1660 
1661 //===----------------------------------------------------------------------===//
1662 // ASTWriter Implementation
1663 //===----------------------------------------------------------------------===//
1664 
1665 void ASTWriter::WriteDeclAbbrevs() {
1666   using namespace llvm;
1667 
1668   BitCodeAbbrev *Abv;
1669 
1670   // Abbreviation for DECL_FIELD
1671   Abv = new BitCodeAbbrev();
1672   Abv->Add(BitCodeAbbrevOp(serialization::DECL_FIELD));
1673   // Decl
1674   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1675   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1676   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1677   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1678   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1679   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1680   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1681   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1682   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1683   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1684   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1685   // NamedDecl
1686   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1687   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1688   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1689   // ValueDecl
1690   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1691   // DeclaratorDecl
1692   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1693   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1694   // FieldDecl
1695   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1696   Abv->Add(BitCodeAbbrevOp(0));                       //getBitWidth
1697   // Type Source Info
1698   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1699   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1700   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1701   DeclFieldAbbrev = Stream.EmitAbbrev(Abv);
1702 
1703   // Abbreviation for DECL_OBJC_IVAR
1704   Abv = new BitCodeAbbrev();
1705   Abv->Add(BitCodeAbbrevOp(serialization::DECL_OBJC_IVAR));
1706   // Decl
1707   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1708   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1709   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1710   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1711   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1712   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1713   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1714   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1715   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1716   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1717   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1718   // NamedDecl
1719   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1720   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1721   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1722   // ValueDecl
1723   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1724   // DeclaratorDecl
1725   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1726   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1727   // FieldDecl
1728   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1729   Abv->Add(BitCodeAbbrevOp(0));                       //getBitWidth
1730   // ObjC Ivar
1731   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getAccessControl
1732   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getSynthesize
1733   // Type Source Info
1734   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1735   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1736   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1737   DeclObjCIvarAbbrev = Stream.EmitAbbrev(Abv);
1738 
1739   // Abbreviation for DECL_ENUM
1740   Abv = new BitCodeAbbrev();
1741   Abv->Add(BitCodeAbbrevOp(serialization::DECL_ENUM));
1742   // Redeclarable
1743   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1744   // Decl
1745   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1746   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1747   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1748   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1749   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1750   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1751   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1752   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1753   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1754   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1755   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1756   // NamedDecl
1757   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1758   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1759   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1760   // TypeDecl
1761   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1762   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1763   // TagDecl
1764   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1765   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1766   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1767   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1768   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1769   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsCompleteDefinitionRequired
1770   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1771   Abv->Add(BitCodeAbbrevOp(0));                         // ExtInfoKind
1772   // EnumDecl
1773   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // AddTypeRef
1774   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IntegerType
1775   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getPromotionType
1776   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumPositiveBits
1777   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumNegativeBits
1778   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScoped
1779   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScopedUsingClassTag
1780   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isFixed
1781   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // InstantiatedMembEnum
1782   // DC
1783   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1784   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1785   DeclEnumAbbrev = Stream.EmitAbbrev(Abv);
1786 
1787   // Abbreviation for DECL_RECORD
1788   Abv = new BitCodeAbbrev();
1789   Abv->Add(BitCodeAbbrevOp(serialization::DECL_RECORD));
1790   // Redeclarable
1791   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1792   // Decl
1793   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1794   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1795   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1796   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1797   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1798   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1799   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1800   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1801   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1802   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1803   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1804   // NamedDecl
1805   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1806   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1807   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1808   // TypeDecl
1809   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1810   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1811   // TagDecl
1812   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1813   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1814   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1815   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1816   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1817   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsCompleteDefinitionRequired
1818   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1819   Abv->Add(BitCodeAbbrevOp(0));                         // ExtInfoKind
1820   // RecordDecl
1821   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // FlexibleArrayMember
1822   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // AnonymousStructUnion
1823   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasObjectMember
1824   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasVolatileMember
1825   // DC
1826   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1827   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1828   DeclRecordAbbrev = Stream.EmitAbbrev(Abv);
1829 
1830   // Abbreviation for DECL_PARM_VAR
1831   Abv = new BitCodeAbbrev();
1832   Abv->Add(BitCodeAbbrevOp(serialization::DECL_PARM_VAR));
1833   // Redeclarable
1834   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1835   // Decl
1836   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1837   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1838   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1839   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1840   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1841   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1842   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1843   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1844   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1845   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1846   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1847   // NamedDecl
1848   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1849   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1850   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1851   // ValueDecl
1852   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1853   // DeclaratorDecl
1854   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1855   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1856   // VarDecl
1857   Abv->Add(BitCodeAbbrevOp(0));                       // StorageClass
1858   Abv->Add(BitCodeAbbrevOp(0));                       // getTSCSpec
1859   Abv->Add(BitCodeAbbrevOp(0));                       // hasCXXDirectInitializer
1860   Abv->Add(BitCodeAbbrevOp(0));                       // Linkage
1861   Abv->Add(BitCodeAbbrevOp(0));                       // HasInit
1862   Abv->Add(BitCodeAbbrevOp(0));                   // HasMemberSpecializationInfo
1863   // ParmVarDecl
1864   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsObjCMethodParameter
1865   Abv->Add(BitCodeAbbrevOp(0));                       // ScopeDepth
1866   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ScopeIndex
1867   Abv->Add(BitCodeAbbrevOp(0));                       // ObjCDeclQualifier
1868   Abv->Add(BitCodeAbbrevOp(0));                       // KNRPromoted
1869   Abv->Add(BitCodeAbbrevOp(0));                       // HasInheritedDefaultArg
1870   Abv->Add(BitCodeAbbrevOp(0));                   // HasUninstantiatedDefaultArg
1871   // Type Source Info
1872   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1873   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1874   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1875   DeclParmVarAbbrev = Stream.EmitAbbrev(Abv);
1876 
1877   // Abbreviation for DECL_TYPEDEF
1878   Abv = new BitCodeAbbrev();
1879   Abv->Add(BitCodeAbbrevOp(serialization::DECL_TYPEDEF));
1880   // Redeclarable
1881   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1882   // Decl
1883   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1884   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1885   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1886   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1887   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1888   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isUsed
1889   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isReferenced
1890   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1891   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // C++ AccessSpecifier
1892   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1893   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1894   // NamedDecl
1895   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1896   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1897   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1898   // TypeDecl
1899   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1900   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1901   // TypedefDecl
1902   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1903   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1904   DeclTypedefAbbrev = Stream.EmitAbbrev(Abv);
1905 
1906   // Abbreviation for DECL_VAR
1907   Abv = new BitCodeAbbrev();
1908   Abv->Add(BitCodeAbbrevOp(serialization::DECL_VAR));
1909   // Redeclarable
1910   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1911   // Decl
1912   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1913   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1914   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1915   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1916   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1917   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1918   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1919   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1920   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1921   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1922   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1923   // NamedDecl
1924   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1925   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1926   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1927   // ValueDecl
1928   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1929   // DeclaratorDecl
1930   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1931   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1932   // VarDecl
1933   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // StorageClass
1934   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // getTSCSpec
1935   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // CXXDirectInitializer
1936   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isExceptionVariable
1937   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isNRVOVariable
1938   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCXXForRangeDecl
1939   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isARCPseudoStrong
1940   Abv->Add(BitCodeAbbrevOp(0));                         // isConstexpr
1941   Abv->Add(BitCodeAbbrevOp(0));                         // isInitCapture
1942   Abv->Add(BitCodeAbbrevOp(0));                         // isPrevDeclInSameScope
1943   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Linkage
1944   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // HasInit
1945   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // HasMemberSpecInfo
1946   // Type Source Info
1947   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1948   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1949   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1950   DeclVarAbbrev = Stream.EmitAbbrev(Abv);
1951 
1952   // Abbreviation for DECL_CXX_METHOD
1953   Abv = new BitCodeAbbrev();
1954   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CXX_METHOD));
1955   // RedeclarableDecl
1956   Abv->Add(BitCodeAbbrevOp(0));                         // CanonicalDecl
1957   // Decl
1958   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // DeclContext
1959   Abv->Add(BitCodeAbbrevOp(0));                         // LexicalDeclContext
1960   Abv->Add(BitCodeAbbrevOp(0));                         // Invalid
1961   Abv->Add(BitCodeAbbrevOp(0));                         // HasAttrs
1962   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Implicit
1963   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Used
1964   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Referenced
1965   Abv->Add(BitCodeAbbrevOp(0));                         // InObjCContainer
1966   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // Access
1967   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ModulePrivate
1968   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SubmoduleID
1969   // NamedDecl
1970   Abv->Add(BitCodeAbbrevOp(DeclarationName::Identifier)); // NameKind
1971   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // Identifier
1972   Abv->Add(BitCodeAbbrevOp(0));                         // AnonDeclNumber
1973   // ValueDecl
1974   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // Type
1975   // DeclaratorDecl
1976   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // InnerLocStart
1977   Abv->Add(BitCodeAbbrevOp(0));                         // HasExtInfo
1978   // FunctionDecl
1979   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 11)); // IDNS
1980   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // StorageClass
1981   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Inline
1982   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InlineSpecified
1983   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // VirtualAsWritten
1984   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Pure
1985   Abv->Add(BitCodeAbbrevOp(0));                         // HasInheritedProto
1986   Abv->Add(BitCodeAbbrevOp(1));                         // HasWrittenProto
1987   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Deleted
1988   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Trivial
1989   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Defaulted
1990   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ExplicitlyDefaulted
1991   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ImplicitReturnZero
1992   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constexpr
1993   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // SkippedBody
1994   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // LateParsed
1995   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Linkage
1996   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LocEnd
1997   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // TemplateKind
1998   // This Array slurps the rest of the record. Fortunately we want to encode
1999   // (nearly) all the remaining (variable number of) fields in the same way.
2000   //
2001   // This is the function template information if any, then
2002   //         NumParams and Params[] from FunctionDecl, and
2003   //         NumOverriddenMethods, OverriddenMethods[] from CXXMethodDecl.
2004   //
2005   //  Add an AbbrevOp for 'size then elements' and use it here.
2006   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2007   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
2008   DeclCXXMethodAbbrev = Stream.EmitAbbrev(Abv);
2009 
2010   // Abbreviation for EXPR_DECL_REF
2011   Abv = new BitCodeAbbrev();
2012   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_DECL_REF));
2013   //Stmt
2014   //Expr
2015   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2016   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2017   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2018   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2019   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2020   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2021   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2022   //DeclRefExpr
2023   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HasQualifier
2024   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //GetDeclFound
2025   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ExplicitTemplateArgs
2026   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HadMultipleCandidates
2027   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
2028                            1)); // RefersToEnclosingVariableOrCapture
2029   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclRef
2030   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
2031   DeclRefExprAbbrev = Stream.EmitAbbrev(Abv);
2032 
2033   // Abbreviation for EXPR_INTEGER_LITERAL
2034   Abv = new BitCodeAbbrev();
2035   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_INTEGER_LITERAL));
2036   //Stmt
2037   //Expr
2038   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2039   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2040   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2041   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2042   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2043   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2044   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2045   //Integer Literal
2046   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
2047   Abv->Add(BitCodeAbbrevOp(32));                      // Bit Width
2048   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Value
2049   IntegerLiteralAbbrev = Stream.EmitAbbrev(Abv);
2050 
2051   // Abbreviation for EXPR_CHARACTER_LITERAL
2052   Abv = new BitCodeAbbrev();
2053   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_CHARACTER_LITERAL));
2054   //Stmt
2055   //Expr
2056   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2057   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2058   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2059   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2060   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2061   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2062   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2063   //Character Literal
2064   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getValue
2065   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
2066   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // getKind
2067   CharacterLiteralAbbrev = Stream.EmitAbbrev(Abv);
2068 
2069   // Abbreviation for EXPR_IMPLICIT_CAST
2070   Abv = new BitCodeAbbrev();
2071   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_IMPLICIT_CAST));
2072   // Stmt
2073   // Expr
2074   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2075   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2076   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2077   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2078   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2079   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2080   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2081   // CastExpr
2082   Abv->Add(BitCodeAbbrevOp(0)); // PathSize
2083   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 6)); // CastKind
2084   // ImplicitCastExpr
2085   ExprImplicitCastAbbrev = Stream.EmitAbbrev(Abv);
2086 
2087   Abv = new BitCodeAbbrev();
2088   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_LEXICAL));
2089   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2090   DeclContextLexicalAbbrev = Stream.EmitAbbrev(Abv);
2091 
2092   Abv = new BitCodeAbbrev();
2093   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_VISIBLE));
2094   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2095   DeclContextVisibleLookupAbbrev = Stream.EmitAbbrev(Abv);
2096 }
2097 
2098 /// isRequiredDecl - Check if this is a "required" Decl, which must be seen by
2099 /// consumers of the AST.
2100 ///
2101 /// Such decls will always be deserialized from the AST file, so we would like
2102 /// this to be as restrictive as possible. Currently the predicate is driven by
2103 /// code generation requirements, if other clients have a different notion of
2104 /// what is "required" then we may have to consider an alternate scheme where
2105 /// clients can iterate over the top-level decls and get information on them,
2106 /// without necessary deserializing them. We could explicitly require such
2107 /// clients to use a separate API call to "realize" the decl. This should be
2108 /// relatively painless since they would presumably only do it for top-level
2109 /// decls.
2110 static bool isRequiredDecl(const Decl *D, ASTContext &Context,
2111                            bool WritingModule) {
2112   // An ObjCMethodDecl is never considered as "required" because its
2113   // implementation container always is.
2114 
2115   // File scoped assembly or obj-c implementation must be seen.
2116   if (isa<FileScopeAsmDecl>(D) || isa<ObjCImplDecl>(D))
2117     return true;
2118 
2119   // ImportDecl is used by codegen to determine the set of imported modules to
2120   // search for inputs for automatic linking; include it if it has a semantic
2121   // effect.
2122   if (isa<ImportDecl>(D) && !WritingModule)
2123     return true;
2124 
2125   return Context.DeclMustBeEmitted(D);
2126 }
2127 
2128 void ASTWriter::WriteDecl(ASTContext &Context, Decl *D) {
2129   // Switch case IDs are per Decl.
2130   ClearSwitchCaseIDs();
2131 
2132   RecordData Record;
2133   ASTDeclWriter W(*this, Context, Record);
2134 
2135   // Determine the ID for this declaration.
2136   serialization::DeclID ID;
2137   assert(!D->isFromASTFile() && "should not be emitting imported decl");
2138   serialization::DeclID &IDR = DeclIDs[D];
2139   if (IDR == 0)
2140     IDR = NextDeclID++;
2141 
2142   ID = IDR;
2143 
2144   bool isReplacingADecl = ID < FirstDeclID;
2145 
2146   // If this declaration is also a DeclContext, write blocks for the
2147   // declarations that lexically stored inside its context and those
2148   // declarations that are visible from its context. These blocks
2149   // are written before the declaration itself so that we can put
2150   // their offsets into the record for the declaration.
2151   uint64_t LexicalOffset = 0;
2152   uint64_t VisibleOffset = 0;
2153   DeclContext *DC = dyn_cast<DeclContext>(D);
2154   if (DC) {
2155     if (isReplacingADecl) {
2156       // It is replacing a decl from a chained PCH; make sure that the
2157       // DeclContext is fully loaded.
2158       if (DC->hasExternalLexicalStorage())
2159         DC->LoadLexicalDeclsFromExternalStorage();
2160       if (DC->hasExternalVisibleStorage())
2161         Chain->completeVisibleDeclsMap(DC);
2162     }
2163     LexicalOffset = WriteDeclContextLexicalBlock(Context, DC);
2164     VisibleOffset = WriteDeclContextVisibleBlock(Context, DC);
2165   }
2166 
2167   // Build a record for this declaration
2168   Record.clear();
2169   W.Code = (serialization::DeclCode)0;
2170   W.AbbrevToUse = 0;
2171   W.Visit(D);
2172   if (DC) W.VisitDeclContext(DC, LexicalOffset, VisibleOffset);
2173 
2174   if (isReplacingADecl) {
2175     // We're replacing a decl in a previous file.
2176     ReplacedDecls.push_back(ReplacedDeclInfo(ID, Stream.GetCurrentBitNo(),
2177                                              D->getLocation()));
2178   } else {
2179     unsigned Index = ID - FirstDeclID;
2180 
2181     // Record the offset for this declaration
2182     SourceLocation Loc = D->getLocation();
2183     if (DeclOffsets.size() == Index)
2184       DeclOffsets.push_back(DeclOffset(Loc, Stream.GetCurrentBitNo()));
2185     else if (DeclOffsets.size() < Index) {
2186       DeclOffsets.resize(Index+1);
2187       DeclOffsets[Index].setLocation(Loc);
2188       DeclOffsets[Index].BitOffset = Stream.GetCurrentBitNo();
2189     }
2190 
2191     SourceManager &SM = Context.getSourceManager();
2192     if (Loc.isValid() && SM.isLocalSourceLocation(Loc))
2193       associateDeclWithFile(D, ID);
2194   }
2195 
2196   if (!W.Code)
2197     llvm::report_fatal_error(StringRef("unexpected declaration kind '") +
2198                             D->getDeclKindName() + "'");
2199   Stream.EmitRecord(W.Code, Record, W.AbbrevToUse);
2200 
2201   // Flush any expressions, base specifiers, and ctor initializers that
2202   // were written as part of this declaration.
2203   FlushPendingAfterDecl();
2204 
2205   // Note declarations that should be deserialized eagerly so that we can add
2206   // them to a record in the AST file later.
2207   if (isRequiredDecl(D, Context, WritingModule))
2208     EagerlyDeserializedDecls.push_back(ID);
2209 }
2210 
2211 void ASTWriter::AddFunctionDefinition(const FunctionDecl *FD,
2212                                       RecordData &Record) {
2213   ClearSwitchCaseIDs();
2214 
2215   ASTDeclWriter W(*this, FD->getASTContext(), Record);
2216   W.AddFunctionDefinition(FD);
2217 }
2218