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 VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D);
137     void VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D);
138 
139     void AddLocalOffset(uint64_t LocalOffset) {
140       uint64_t Offset = Writer.Stream.GetCurrentBitNo();
141       assert(LocalOffset < Offset && "invalid offset");
142       Record.push_back(LocalOffset ? Offset - LocalOffset : 0);
143     }
144 
145     /// Add an Objective-C type parameter list to the given record.
146     void AddObjCTypeParamList(ObjCTypeParamList *typeParams) {
147       // Empty type parameter list.
148       if (!typeParams) {
149         Record.push_back(0);
150         return;
151       }
152 
153       Record.push_back(typeParams->size());
154       for (auto typeParam : *typeParams) {
155         Writer.AddDeclRef(typeParam, Record);
156       }
157       Writer.AddSourceLocation(typeParams->getLAngleLoc(), Record);
158       Writer.AddSourceLocation(typeParams->getRAngleLoc(), Record);
159     }
160 
161     void AddFunctionDefinition(const FunctionDecl *FD) {
162       assert(FD->doesThisDeclarationHaveABody());
163       if (auto *CD = dyn_cast<CXXConstructorDecl>(FD)) {
164         Record.push_back(CD->NumCtorInitializers);
165         if (CD->NumCtorInitializers)
166           Writer.AddCXXCtorInitializersRef(
167               llvm::makeArrayRef(CD->init_begin(), CD->init_end()), Record);
168       }
169       Writer.AddStmt(FD->getBody());
170     }
171 
172     /// Add to the record the first declaration from each module file that
173     /// provides a declaration of D. The intent is to provide a sufficient
174     /// set such that reloading this set will load all current redeclarations.
175     void AddFirstDeclFromEachModule(const Decl *D, bool IncludeLocal) {
176       llvm::MapVector<ModuleFile*, const Decl*> Firsts;
177       // FIXME: We can skip entries that we know are implied by others.
178       for (const Decl *R = D->getMostRecentDecl(); R; R = R->getPreviousDecl()) {
179         if (R->isFromASTFile())
180           Firsts[Writer.Chain->getOwningModuleFile(R)] = R;
181         else if (IncludeLocal)
182           Firsts[nullptr] = R;
183       }
184       for (const auto &F : Firsts)
185         Writer.AddDeclRef(F.second, Record);
186     }
187 
188     /// Get the specialization decl from an entry in the specialization list.
189     template <typename EntryType>
190     typename RedeclarableTemplateDecl::SpecEntryTraits<EntryType>::DeclType *
191     getSpecializationDecl(EntryType &T) {
192       return RedeclarableTemplateDecl::SpecEntryTraits<EntryType>::getDecl(&T);
193     }
194 
195     /// Get the list of partial specializations from a template's common ptr.
196     template<typename T>
197     decltype(T::PartialSpecializations) &getPartialSpecializations(T *Common) {
198       return Common->PartialSpecializations;
199     }
200     ArrayRef<Decl> getPartialSpecializations(FunctionTemplateDecl::Common *) {
201       return None;
202     }
203 
204     template<typename DeclTy>
205     void AddTemplateSpecializations(DeclTy *D) {
206       auto *Common = D->getCommonPtr();
207 
208       // If we have any lazy specializations, and the external AST source is
209       // our chained AST reader, we can just write out the DeclIDs. Otherwise,
210       // we need to resolve them to actual declarations.
211       if (Writer.Chain != Writer.Context->getExternalSource() &&
212           Common->LazySpecializations) {
213         D->LoadLazySpecializations();
214         assert(!Common->LazySpecializations);
215       }
216 
217       ArrayRef<DeclID> LazySpecializations;
218       if (auto *LS = Common->LazySpecializations)
219         LazySpecializations = llvm::makeArrayRef(LS + 1, LS[0]);
220 
221       // Add a slot to the record for the number of specializations.
222       unsigned I = Record.size();
223       Record.push_back(0);
224 
225       // AddFirstDeclFromEachModule might trigger deserialization, invalidating
226       // *Specializations iterators.
227       llvm::SmallVector<const Decl*, 16> Specs;
228       for (auto &Entry : Common->Specializations)
229         Specs.push_back(getSpecializationDecl(Entry));
230       for (auto &Entry : getPartialSpecializations(Common))
231         Specs.push_back(getSpecializationDecl(Entry));
232 
233       for (auto *D : Specs) {
234         assert(D->isCanonicalDecl() && "non-canonical decl in set");
235         AddFirstDeclFromEachModule(D, /*IncludeLocal*/true);
236       }
237       Record.append(LazySpecializations.begin(), LazySpecializations.end());
238 
239       // Update the size entry we added earlier.
240       Record[I] = Record.size() - I - 1;
241     }
242 
243     /// Ensure that this template specialization is associated with the specified
244     /// template on reload.
245     void RegisterTemplateSpecialization(const Decl *Template,
246                                         const Decl *Specialization) {
247       Template = Template->getCanonicalDecl();
248 
249       // If the canonical template is local, we'll write out this specialization
250       // when we emit it.
251       // FIXME: We can do the same thing if there is any local declaration of
252       // the template, to avoid emitting an update record.
253       if (!Template->isFromASTFile())
254         return;
255 
256       // We only need to associate the first local declaration of the
257       // specialization. The other declarations will get pulled in by it.
258       if (Writer.getFirstLocalDecl(Specialization) != Specialization)
259         return;
260 
261       Writer.DeclUpdates[Template].push_back(ASTWriter::DeclUpdate(
262           UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION, Specialization));
263     }
264   };
265 }
266 
267 void ASTDeclWriter::Visit(Decl *D) {
268   DeclVisitor<ASTDeclWriter>::Visit(D);
269 
270   // Source locations require array (variable-length) abbreviations.  The
271   // abbreviation infrastructure requires that arrays are encoded last, so
272   // we handle it here in the case of those classes derived from DeclaratorDecl
273   if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)) {
274     Writer.AddTypeSourceInfo(DD->getTypeSourceInfo(), Record);
275   }
276 
277   // Handle FunctionDecl's body here and write it after all other Stmts/Exprs
278   // have been written. We want it last because we will not read it back when
279   // retrieving it from the AST, we'll just lazily set the offset.
280   if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
281     Record.push_back(FD->doesThisDeclarationHaveABody());
282     if (FD->doesThisDeclarationHaveABody())
283       AddFunctionDefinition(FD);
284   }
285 }
286 
287 void ASTDeclWriter::VisitDecl(Decl *D) {
288   Writer.AddDeclRef(cast_or_null<Decl>(D->getDeclContext()), Record);
289   if (D->getDeclContext() != D->getLexicalDeclContext())
290     Writer.AddDeclRef(cast_or_null<Decl>(D->getLexicalDeclContext()), Record);
291   else
292     Record.push_back(0);
293   Record.push_back(D->isInvalidDecl());
294   Record.push_back(D->hasAttrs());
295   if (D->hasAttrs())
296     Writer.WriteAttributes(llvm::makeArrayRef(D->getAttrs().begin(),
297                                               D->getAttrs().size()), Record);
298   Record.push_back(D->isImplicit());
299   Record.push_back(D->isUsed(false));
300   Record.push_back(D->isReferenced());
301   Record.push_back(D->isTopLevelDeclInObjCContainer());
302   Record.push_back(D->getAccess());
303   Record.push_back(D->isModulePrivate());
304   Record.push_back(Writer.inferSubmoduleIDFromLocation(D->getLocation()));
305 
306   // If this declaration injected a name into a context different from its
307   // lexical context, and that context is an imported namespace, we need to
308   // update its visible declarations to include this name.
309   //
310   // This happens when we instantiate a class with a friend declaration or a
311   // function with a local extern declaration, for instance.
312   //
313   // FIXME: Can we handle this in AddedVisibleDecl instead?
314   if (D->isOutOfLine()) {
315     auto *DC = D->getDeclContext();
316     while (auto *NS = dyn_cast<NamespaceDecl>(DC->getRedeclContext())) {
317       if (!NS->isFromASTFile())
318         break;
319       Writer.UpdatedDeclContexts.insert(NS->getPrimaryContext());
320       if (!NS->isInlineNamespace())
321         break;
322       DC = NS->getParent();
323     }
324   }
325 }
326 
327 void ASTDeclWriter::VisitPragmaCommentDecl(PragmaCommentDecl *D) {
328   StringRef Arg = D->getArg();
329   Record.push_back(Arg.size());
330   VisitDecl(D);
331   Writer.AddSourceLocation(D->getLocStart(), Record);
332   Record.push_back(D->getCommentKind());
333   Writer.AddString(Arg, Record);
334   Code = serialization::DECL_PRAGMA_COMMENT;
335 }
336 
337 void ASTDeclWriter::VisitPragmaDetectMismatchDecl(
338     PragmaDetectMismatchDecl *D) {
339   StringRef Name = D->getName();
340   StringRef Value = D->getValue();
341   Record.push_back(Name.size() + 1 + Value.size());
342   VisitDecl(D);
343   Writer.AddSourceLocation(D->getLocStart(), Record);
344   Writer.AddString(Name, Record);
345   Writer.AddString(Value, Record);
346   Code = serialization::DECL_PRAGMA_DETECT_MISMATCH;
347 }
348 
349 void ASTDeclWriter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
350   llvm_unreachable("Translation units aren't directly serialized");
351 }
352 
353 void ASTDeclWriter::VisitNamedDecl(NamedDecl *D) {
354   VisitDecl(D);
355   Writer.AddDeclarationName(D->getDeclName(), Record);
356   Record.push_back(needsAnonymousDeclarationNumber(D)
357                        ? Writer.getAnonymousDeclarationNumber(D)
358                        : 0);
359 }
360 
361 void ASTDeclWriter::VisitTypeDecl(TypeDecl *D) {
362   VisitNamedDecl(D);
363   Writer.AddSourceLocation(D->getLocStart(), Record);
364   Writer.AddTypeRef(QualType(D->getTypeForDecl(), 0), Record);
365 }
366 
367 void ASTDeclWriter::VisitTypedefNameDecl(TypedefNameDecl *D) {
368   VisitRedeclarable(D);
369   VisitTypeDecl(D);
370   Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record);
371   Record.push_back(D->isModed());
372   if (D->isModed())
373     Writer.AddTypeRef(D->getUnderlyingType(), Record);
374 }
375 
376 void ASTDeclWriter::VisitTypedefDecl(TypedefDecl *D) {
377   VisitTypedefNameDecl(D);
378   if (D->getDeclContext() == D->getLexicalDeclContext() &&
379       !D->hasAttrs() &&
380       !D->isImplicit() &&
381       D->getFirstDecl() == D->getMostRecentDecl() &&
382       !D->isInvalidDecl() &&
383       !D->isTopLevelDeclInObjCContainer() &&
384       !D->isModulePrivate() &&
385       !needsAnonymousDeclarationNumber(D) &&
386       D->getDeclName().getNameKind() == DeclarationName::Identifier)
387     AbbrevToUse = Writer.getDeclTypedefAbbrev();
388 
389   Code = serialization::DECL_TYPEDEF;
390 }
391 
392 void ASTDeclWriter::VisitTypeAliasDecl(TypeAliasDecl *D) {
393   VisitTypedefNameDecl(D);
394   Writer.AddDeclRef(D->getDescribedAliasTemplate(), Record);
395   Code = serialization::DECL_TYPEALIAS;
396 }
397 
398 void ASTDeclWriter::VisitTagDecl(TagDecl *D) {
399   VisitRedeclarable(D);
400   VisitTypeDecl(D);
401   Record.push_back(D->getIdentifierNamespace());
402   Record.push_back((unsigned)D->getTagKind()); // FIXME: stable encoding
403   if (!isa<CXXRecordDecl>(D))
404     Record.push_back(D->isCompleteDefinition());
405   Record.push_back(D->isEmbeddedInDeclarator());
406   Record.push_back(D->isFreeStanding());
407   Record.push_back(D->isCompleteDefinitionRequired());
408   Writer.AddSourceLocation(D->getRBraceLoc(), Record);
409 
410   if (D->hasExtInfo()) {
411     Record.push_back(1);
412     Writer.AddQualifierInfo(*D->getExtInfo(), Record);
413   } else if (auto *TD = D->getTypedefNameForAnonDecl()) {
414     Record.push_back(2);
415     Writer.AddDeclRef(TD, Record);
416     Writer.AddIdentifierRef(TD->getDeclName().getAsIdentifierInfo(), Record);
417   } else {
418     Record.push_back(0);
419   }
420 }
421 
422 void ASTDeclWriter::VisitEnumDecl(EnumDecl *D) {
423   VisitTagDecl(D);
424   Writer.AddTypeSourceInfo(D->getIntegerTypeSourceInfo(), Record);
425   if (!D->getIntegerTypeSourceInfo())
426     Writer.AddTypeRef(D->getIntegerType(), Record);
427   Writer.AddTypeRef(D->getPromotionType(), Record);
428   Record.push_back(D->getNumPositiveBits());
429   Record.push_back(D->getNumNegativeBits());
430   Record.push_back(D->isScoped());
431   Record.push_back(D->isScopedUsingClassTag());
432   Record.push_back(D->isFixed());
433   if (MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo()) {
434     Writer.AddDeclRef(MemberInfo->getInstantiatedFrom(), Record);
435     Record.push_back(MemberInfo->getTemplateSpecializationKind());
436     Writer.AddSourceLocation(MemberInfo->getPointOfInstantiation(), Record);
437   } else {
438     Writer.AddDeclRef(nullptr, Record);
439   }
440 
441   if (D->getDeclContext() == D->getLexicalDeclContext() &&
442       !D->hasAttrs() &&
443       !D->isImplicit() &&
444       !D->isUsed(false) &&
445       !D->hasExtInfo() &&
446       !D->getTypedefNameForAnonDecl() &&
447       D->getFirstDecl() == D->getMostRecentDecl() &&
448       !D->isInvalidDecl() &&
449       !D->isReferenced() &&
450       !D->isTopLevelDeclInObjCContainer() &&
451       D->getAccess() == AS_none &&
452       !D->isModulePrivate() &&
453       !CXXRecordDecl::classofKind(D->getKind()) &&
454       !D->getIntegerTypeSourceInfo() &&
455       !D->getMemberSpecializationInfo() &&
456       !needsAnonymousDeclarationNumber(D) &&
457       D->getDeclName().getNameKind() == DeclarationName::Identifier)
458     AbbrevToUse = Writer.getDeclEnumAbbrev();
459 
460   Code = serialization::DECL_ENUM;
461 }
462 
463 void ASTDeclWriter::VisitRecordDecl(RecordDecl *D) {
464   VisitTagDecl(D);
465   Record.push_back(D->hasFlexibleArrayMember());
466   Record.push_back(D->isAnonymousStructOrUnion());
467   Record.push_back(D->hasObjectMember());
468   Record.push_back(D->hasVolatileMember());
469 
470   if (D->getDeclContext() == D->getLexicalDeclContext() &&
471       !D->hasAttrs() &&
472       !D->isImplicit() &&
473       !D->isUsed(false) &&
474       !D->hasExtInfo() &&
475       !D->getTypedefNameForAnonDecl() &&
476       D->getFirstDecl() == D->getMostRecentDecl() &&
477       !D->isInvalidDecl() &&
478       !D->isReferenced() &&
479       !D->isTopLevelDeclInObjCContainer() &&
480       D->getAccess() == AS_none &&
481       !D->isModulePrivate() &&
482       !CXXRecordDecl::classofKind(D->getKind()) &&
483       !needsAnonymousDeclarationNumber(D) &&
484       D->getDeclName().getNameKind() == DeclarationName::Identifier)
485     AbbrevToUse = Writer.getDeclRecordAbbrev();
486 
487   Code = serialization::DECL_RECORD;
488 }
489 
490 void ASTDeclWriter::VisitValueDecl(ValueDecl *D) {
491   VisitNamedDecl(D);
492   Writer.AddTypeRef(D->getType(), Record);
493 }
494 
495 void ASTDeclWriter::VisitEnumConstantDecl(EnumConstantDecl *D) {
496   VisitValueDecl(D);
497   Record.push_back(D->getInitExpr()? 1 : 0);
498   if (D->getInitExpr())
499     Writer.AddStmt(D->getInitExpr());
500   Writer.AddAPSInt(D->getInitVal(), Record);
501 
502   Code = serialization::DECL_ENUM_CONSTANT;
503 }
504 
505 void ASTDeclWriter::VisitDeclaratorDecl(DeclaratorDecl *D) {
506   VisitValueDecl(D);
507   Writer.AddSourceLocation(D->getInnerLocStart(), Record);
508   Record.push_back(D->hasExtInfo());
509   if (D->hasExtInfo())
510     Writer.AddQualifierInfo(*D->getExtInfo(), Record);
511 }
512 
513 void ASTDeclWriter::VisitFunctionDecl(FunctionDecl *D) {
514   VisitRedeclarable(D);
515   VisitDeclaratorDecl(D);
516   Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
517   Record.push_back(D->getIdentifierNamespace());
518 
519   // FunctionDecl's body is handled last at ASTWriterDecl::Visit,
520   // after everything else is written.
521 
522   Record.push_back((int)D->SClass); // FIXME: stable encoding
523   Record.push_back(D->IsInline);
524   Record.push_back(D->IsInlineSpecified);
525   Record.push_back(D->IsVirtualAsWritten);
526   Record.push_back(D->IsPure);
527   Record.push_back(D->HasInheritedPrototype);
528   Record.push_back(D->HasWrittenPrototype);
529   Record.push_back(D->IsDeleted);
530   Record.push_back(D->IsTrivial);
531   Record.push_back(D->IsDefaulted);
532   Record.push_back(D->IsExplicitlyDefaulted);
533   Record.push_back(D->HasImplicitReturnZero);
534   Record.push_back(D->IsConstexpr);
535   Record.push_back(D->HasSkippedBody);
536   Record.push_back(D->IsLateTemplateParsed);
537   Record.push_back(D->getLinkageInternal());
538   Writer.AddSourceLocation(D->getLocEnd(), Record);
539 
540   Record.push_back(D->getTemplatedKind());
541   switch (D->getTemplatedKind()) {
542   case FunctionDecl::TK_NonTemplate:
543     break;
544   case FunctionDecl::TK_FunctionTemplate:
545     Writer.AddDeclRef(D->getDescribedFunctionTemplate(), Record);
546     break;
547   case FunctionDecl::TK_MemberSpecialization: {
548     MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo();
549     Writer.AddDeclRef(MemberInfo->getInstantiatedFrom(), Record);
550     Record.push_back(MemberInfo->getTemplateSpecializationKind());
551     Writer.AddSourceLocation(MemberInfo->getPointOfInstantiation(), Record);
552     break;
553   }
554   case FunctionDecl::TK_FunctionTemplateSpecialization: {
555     FunctionTemplateSpecializationInfo *
556       FTSInfo = D->getTemplateSpecializationInfo();
557 
558     RegisterTemplateSpecialization(FTSInfo->getTemplate(), D);
559 
560     Writer.AddDeclRef(FTSInfo->getTemplate(), Record);
561     Record.push_back(FTSInfo->getTemplateSpecializationKind());
562 
563     // Template arguments.
564     Writer.AddTemplateArgumentList(FTSInfo->TemplateArguments, Record);
565 
566     // Template args as written.
567     Record.push_back(FTSInfo->TemplateArgumentsAsWritten != nullptr);
568     if (FTSInfo->TemplateArgumentsAsWritten) {
569       Record.push_back(FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs);
570       for (int i=0, e = FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs;
571              i!=e; ++i)
572         Writer.AddTemplateArgumentLoc((*FTSInfo->TemplateArgumentsAsWritten)[i],
573                                       Record);
574       Writer.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->LAngleLoc,
575                                Record);
576       Writer.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->RAngleLoc,
577                                Record);
578     }
579 
580     Writer.AddSourceLocation(FTSInfo->getPointOfInstantiation(), Record);
581 
582     if (D->isCanonicalDecl()) {
583       // Write the template that contains the specializations set. We will
584       // add a FunctionTemplateSpecializationInfo to it when reading.
585       Writer.AddDeclRef(FTSInfo->getTemplate()->getCanonicalDecl(), Record);
586     }
587     break;
588   }
589   case FunctionDecl::TK_DependentFunctionTemplateSpecialization: {
590     DependentFunctionTemplateSpecializationInfo *
591       DFTSInfo = D->getDependentSpecializationInfo();
592 
593     // Templates.
594     Record.push_back(DFTSInfo->getNumTemplates());
595     for (int i=0, e = DFTSInfo->getNumTemplates(); i != e; ++i)
596       Writer.AddDeclRef(DFTSInfo->getTemplate(i), Record);
597 
598     // Templates args.
599     Record.push_back(DFTSInfo->getNumTemplateArgs());
600     for (int i=0, e = DFTSInfo->getNumTemplateArgs(); i != e; ++i)
601       Writer.AddTemplateArgumentLoc(DFTSInfo->getTemplateArg(i), Record);
602     Writer.AddSourceLocation(DFTSInfo->getLAngleLoc(), Record);
603     Writer.AddSourceLocation(DFTSInfo->getRAngleLoc(), Record);
604     break;
605   }
606   }
607 
608   Record.push_back(D->param_size());
609   for (auto P : D->params())
610     Writer.AddDeclRef(P, Record);
611   Code = serialization::DECL_FUNCTION;
612 }
613 
614 void ASTDeclWriter::VisitObjCMethodDecl(ObjCMethodDecl *D) {
615   VisitNamedDecl(D);
616   // FIXME: convert to LazyStmtPtr?
617   // Unlike C/C++, method bodies will never be in header files.
618   bool HasBodyStuff = D->getBody() != nullptr     ||
619                       D->getSelfDecl() != nullptr || D->getCmdDecl() != nullptr;
620   Record.push_back(HasBodyStuff);
621   if (HasBodyStuff) {
622     Writer.AddStmt(D->getBody());
623     Writer.AddDeclRef(D->getSelfDecl(), Record);
624     Writer.AddDeclRef(D->getCmdDecl(), Record);
625   }
626   Record.push_back(D->isInstanceMethod());
627   Record.push_back(D->isVariadic());
628   Record.push_back(D->isPropertyAccessor());
629   Record.push_back(D->isDefined());
630   Record.push_back(D->IsOverriding);
631   Record.push_back(D->HasSkippedBody);
632 
633   Record.push_back(D->IsRedeclaration);
634   Record.push_back(D->HasRedeclaration);
635   if (D->HasRedeclaration) {
636     assert(Context.getObjCMethodRedeclaration(D));
637     Writer.AddDeclRef(Context.getObjCMethodRedeclaration(D), Record);
638   }
639 
640   // FIXME: stable encoding for @required/@optional
641   Record.push_back(D->getImplementationControl());
642   // FIXME: stable encoding for in/out/inout/bycopy/byref/oneway/nullability
643   Record.push_back(D->getObjCDeclQualifier());
644   Record.push_back(D->hasRelatedResultType());
645   Writer.AddTypeRef(D->getReturnType(), Record);
646   Writer.AddTypeSourceInfo(D->getReturnTypeSourceInfo(), Record);
647   Writer.AddSourceLocation(D->getLocEnd(), Record);
648   Record.push_back(D->param_size());
649   for (const auto *P : D->params())
650     Writer.AddDeclRef(P, Record);
651 
652   Record.push_back(D->SelLocsKind);
653   unsigned NumStoredSelLocs = D->getNumStoredSelLocs();
654   SourceLocation *SelLocs = D->getStoredSelLocs();
655   Record.push_back(NumStoredSelLocs);
656   for (unsigned i = 0; i != NumStoredSelLocs; ++i)
657     Writer.AddSourceLocation(SelLocs[i], Record);
658 
659   Code = serialization::DECL_OBJC_METHOD;
660 }
661 
662 void ASTDeclWriter::VisitObjCTypeParamDecl(ObjCTypeParamDecl *D) {
663   VisitTypedefNameDecl(D);
664   Record.push_back(D->Variance);
665   Record.push_back(D->Index);
666   Writer.AddSourceLocation(D->VarianceLoc, Record);
667   Writer.AddSourceLocation(D->ColonLoc, Record);
668 
669   Code = serialization::DECL_OBJC_TYPE_PARAM;
670 }
671 
672 void ASTDeclWriter::VisitObjCContainerDecl(ObjCContainerDecl *D) {
673   VisitNamedDecl(D);
674   Writer.AddSourceLocation(D->getAtStartLoc(), Record);
675   Writer.AddSourceRange(D->getAtEndRange(), Record);
676   // Abstract class (no need to define a stable serialization::DECL code).
677 }
678 
679 void ASTDeclWriter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *D) {
680   VisitRedeclarable(D);
681   VisitObjCContainerDecl(D);
682   Writer.AddTypeRef(QualType(D->getTypeForDecl(), 0), Record);
683   AddObjCTypeParamList(D->TypeParamList);
684 
685   Record.push_back(D->isThisDeclarationADefinition());
686   if (D->isThisDeclarationADefinition()) {
687     // Write the DefinitionData
688     ObjCInterfaceDecl::DefinitionData &Data = D->data();
689 
690     Writer.AddTypeSourceInfo(D->getSuperClassTInfo(), Record);
691     Writer.AddSourceLocation(D->getEndOfDefinitionLoc(), Record);
692     Record.push_back(Data.HasDesignatedInitializers);
693 
694     // Write out the protocols that are directly referenced by the @interface.
695     Record.push_back(Data.ReferencedProtocols.size());
696     for (const auto *P : D->protocols())
697       Writer.AddDeclRef(P, Record);
698     for (const auto &PL : D->protocol_locs())
699       Writer.AddSourceLocation(PL, Record);
700 
701     // Write out the protocols that are transitively referenced.
702     Record.push_back(Data.AllReferencedProtocols.size());
703     for (ObjCList<ObjCProtocolDecl>::iterator
704               P = Data.AllReferencedProtocols.begin(),
705            PEnd = Data.AllReferencedProtocols.end();
706          P != PEnd; ++P)
707       Writer.AddDeclRef(*P, Record);
708 
709 
710     if (ObjCCategoryDecl *Cat = D->getCategoryListRaw()) {
711       // Ensure that we write out the set of categories for this class.
712       Writer.ObjCClassesWithCategories.insert(D);
713 
714       // Make sure that the categories get serialized.
715       for (; Cat; Cat = Cat->getNextClassCategoryRaw())
716         (void)Writer.GetDeclRef(Cat);
717     }
718   }
719 
720   Code = serialization::DECL_OBJC_INTERFACE;
721 }
722 
723 void ASTDeclWriter::VisitObjCIvarDecl(ObjCIvarDecl *D) {
724   VisitFieldDecl(D);
725   // FIXME: stable encoding for @public/@private/@protected/@package
726   Record.push_back(D->getAccessControl());
727   Record.push_back(D->getSynthesize());
728 
729   if (D->getDeclContext() == D->getLexicalDeclContext() &&
730       !D->hasAttrs() &&
731       !D->isImplicit() &&
732       !D->isUsed(false) &&
733       !D->isInvalidDecl() &&
734       !D->isReferenced() &&
735       !D->isModulePrivate() &&
736       !D->getBitWidth() &&
737       !D->hasExtInfo() &&
738       D->getDeclName())
739     AbbrevToUse = Writer.getDeclObjCIvarAbbrev();
740 
741   Code = serialization::DECL_OBJC_IVAR;
742 }
743 
744 void ASTDeclWriter::VisitObjCProtocolDecl(ObjCProtocolDecl *D) {
745   VisitRedeclarable(D);
746   VisitObjCContainerDecl(D);
747 
748   Record.push_back(D->isThisDeclarationADefinition());
749   if (D->isThisDeclarationADefinition()) {
750     Record.push_back(D->protocol_size());
751     for (const auto *I : D->protocols())
752       Writer.AddDeclRef(I, Record);
753     for (const auto &PL : D->protocol_locs())
754       Writer.AddSourceLocation(PL, Record);
755   }
756 
757   Code = serialization::DECL_OBJC_PROTOCOL;
758 }
759 
760 void ASTDeclWriter::VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D) {
761   VisitFieldDecl(D);
762   Code = serialization::DECL_OBJC_AT_DEFS_FIELD;
763 }
764 
765 void ASTDeclWriter::VisitObjCCategoryDecl(ObjCCategoryDecl *D) {
766   VisitObjCContainerDecl(D);
767   Writer.AddSourceLocation(D->getCategoryNameLoc(), Record);
768   Writer.AddSourceLocation(D->getIvarLBraceLoc(), Record);
769   Writer.AddSourceLocation(D->getIvarRBraceLoc(), Record);
770   Writer.AddDeclRef(D->getClassInterface(), Record);
771   AddObjCTypeParamList(D->TypeParamList);
772   Record.push_back(D->protocol_size());
773   for (const auto *I : D->protocols())
774     Writer.AddDeclRef(I, Record);
775   for (const auto &PL : D->protocol_locs())
776     Writer.AddSourceLocation(PL, Record);
777   Code = serialization::DECL_OBJC_CATEGORY;
778 }
779 
780 void ASTDeclWriter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D) {
781   VisitNamedDecl(D);
782   Writer.AddDeclRef(D->getClassInterface(), Record);
783   Code = serialization::DECL_OBJC_COMPATIBLE_ALIAS;
784 }
785 
786 void ASTDeclWriter::VisitObjCPropertyDecl(ObjCPropertyDecl *D) {
787   VisitNamedDecl(D);
788   Writer.AddSourceLocation(D->getAtLoc(), Record);
789   Writer.AddSourceLocation(D->getLParenLoc(), Record);
790   Writer.AddTypeRef(D->getType(), Record);
791   Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record);
792   // FIXME: stable encoding
793   Record.push_back((unsigned)D->getPropertyAttributes());
794   Record.push_back((unsigned)D->getPropertyAttributesAsWritten());
795   // FIXME: stable encoding
796   Record.push_back((unsigned)D->getPropertyImplementation());
797   Writer.AddDeclarationName(D->getGetterName(), Record);
798   Writer.AddDeclarationName(D->getSetterName(), Record);
799   Writer.AddDeclRef(D->getGetterMethodDecl(), Record);
800   Writer.AddDeclRef(D->getSetterMethodDecl(), Record);
801   Writer.AddDeclRef(D->getPropertyIvarDecl(), Record);
802   Code = serialization::DECL_OBJC_PROPERTY;
803 }
804 
805 void ASTDeclWriter::VisitObjCImplDecl(ObjCImplDecl *D) {
806   VisitObjCContainerDecl(D);
807   Writer.AddDeclRef(D->getClassInterface(), Record);
808   // Abstract class (no need to define a stable serialization::DECL code).
809 }
810 
811 void ASTDeclWriter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D) {
812   VisitObjCImplDecl(D);
813   Writer.AddIdentifierRef(D->getIdentifier(), Record);
814   Writer.AddSourceLocation(D->getCategoryNameLoc(), Record);
815   Code = serialization::DECL_OBJC_CATEGORY_IMPL;
816 }
817 
818 void ASTDeclWriter::VisitObjCImplementationDecl(ObjCImplementationDecl *D) {
819   VisitObjCImplDecl(D);
820   Writer.AddDeclRef(D->getSuperClass(), Record);
821   Writer.AddSourceLocation(D->getSuperClassLoc(), Record);
822   Writer.AddSourceLocation(D->getIvarLBraceLoc(), Record);
823   Writer.AddSourceLocation(D->getIvarRBraceLoc(), Record);
824   Record.push_back(D->hasNonZeroConstructors());
825   Record.push_back(D->hasDestructors());
826   Record.push_back(D->NumIvarInitializers);
827   if (D->NumIvarInitializers)
828     Writer.AddCXXCtorInitializersRef(
829         llvm::makeArrayRef(D->init_begin(), D->init_end()), Record);
830   Code = serialization::DECL_OBJC_IMPLEMENTATION;
831 }
832 
833 void ASTDeclWriter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D) {
834   VisitDecl(D);
835   Writer.AddSourceLocation(D->getLocStart(), Record);
836   Writer.AddDeclRef(D->getPropertyDecl(), Record);
837   Writer.AddDeclRef(D->getPropertyIvarDecl(), Record);
838   Writer.AddSourceLocation(D->getPropertyIvarDeclLoc(), Record);
839   Writer.AddStmt(D->getGetterCXXConstructor());
840   Writer.AddStmt(D->getSetterCXXAssignment());
841   Code = serialization::DECL_OBJC_PROPERTY_IMPL;
842 }
843 
844 void ASTDeclWriter::VisitFieldDecl(FieldDecl *D) {
845   VisitDeclaratorDecl(D);
846   Record.push_back(D->isMutable());
847   if (D->InitStorage.getInt() == FieldDecl::ISK_BitWidthOrNothing &&
848       D->InitStorage.getPointer() == nullptr) {
849     Record.push_back(0);
850   } else if (D->InitStorage.getInt() == FieldDecl::ISK_CapturedVLAType) {
851     Record.push_back(D->InitStorage.getInt() + 1);
852     Writer.AddTypeRef(
853         QualType(static_cast<Type *>(D->InitStorage.getPointer()), 0),
854         Record);
855   } else {
856     Record.push_back(D->InitStorage.getInt() + 1);
857     Writer.AddStmt(static_cast<Expr *>(D->InitStorage.getPointer()));
858   }
859   if (!D->getDeclName())
860     Writer.AddDeclRef(Context.getInstantiatedFromUnnamedFieldDecl(D), Record);
861 
862   if (D->getDeclContext() == D->getLexicalDeclContext() &&
863       !D->hasAttrs() &&
864       !D->isImplicit() &&
865       !D->isUsed(false) &&
866       !D->isInvalidDecl() &&
867       !D->isReferenced() &&
868       !D->isTopLevelDeclInObjCContainer() &&
869       !D->isModulePrivate() &&
870       !D->getBitWidth() &&
871       !D->hasInClassInitializer() &&
872       !D->hasExtInfo() &&
873       !ObjCIvarDecl::classofKind(D->getKind()) &&
874       !ObjCAtDefsFieldDecl::classofKind(D->getKind()) &&
875       D->getDeclName())
876     AbbrevToUse = Writer.getDeclFieldAbbrev();
877 
878   Code = serialization::DECL_FIELD;
879 }
880 
881 void ASTDeclWriter::VisitMSPropertyDecl(MSPropertyDecl *D) {
882   VisitDeclaratorDecl(D);
883   Writer.AddIdentifierRef(D->getGetterId(), Record);
884   Writer.AddIdentifierRef(D->getSetterId(), Record);
885   Code = serialization::DECL_MS_PROPERTY;
886 }
887 
888 void ASTDeclWriter::VisitIndirectFieldDecl(IndirectFieldDecl *D) {
889   VisitValueDecl(D);
890   Record.push_back(D->getChainingSize());
891 
892   for (const auto *P : D->chain())
893     Writer.AddDeclRef(P, Record);
894   Code = serialization::DECL_INDIRECTFIELD;
895 }
896 
897 void ASTDeclWriter::VisitVarDecl(VarDecl *D) {
898   VisitRedeclarable(D);
899   VisitDeclaratorDecl(D);
900   Record.push_back(D->getStorageClass());
901   Record.push_back(D->getTSCSpec());
902   Record.push_back(D->getInitStyle());
903   if (!isa<ParmVarDecl>(D)) {
904     Record.push_back(D->isExceptionVariable());
905     Record.push_back(D->isNRVOVariable());
906     Record.push_back(D->isCXXForRangeDecl());
907     Record.push_back(D->isARCPseudoStrong());
908     Record.push_back(D->isConstexpr());
909     Record.push_back(D->isInitCapture());
910     Record.push_back(D->isPreviousDeclInSameBlockScope());
911   }
912   Record.push_back(D->getLinkageInternal());
913 
914   if (D->getInit()) {
915     Record.push_back(!D->isInitKnownICE() ? 1 : (D->isInitICE() ? 3 : 2));
916     Writer.AddStmt(D->getInit());
917   } else {
918     Record.push_back(0);
919   }
920 
921   enum {
922     VarNotTemplate = 0, VarTemplate, StaticDataMemberSpecialization
923   };
924   if (VarTemplateDecl *TemplD = D->getDescribedVarTemplate()) {
925     Record.push_back(VarTemplate);
926     Writer.AddDeclRef(TemplD, Record);
927   } else if (MemberSpecializationInfo *SpecInfo
928                = D->getMemberSpecializationInfo()) {
929     Record.push_back(StaticDataMemberSpecialization);
930     Writer.AddDeclRef(SpecInfo->getInstantiatedFrom(), Record);
931     Record.push_back(SpecInfo->getTemplateSpecializationKind());
932     Writer.AddSourceLocation(SpecInfo->getPointOfInstantiation(), Record);
933   } else {
934     Record.push_back(VarNotTemplate);
935   }
936 
937   if (D->getDeclContext() == D->getLexicalDeclContext() &&
938       !D->hasAttrs() &&
939       !D->isImplicit() &&
940       !D->isUsed(false) &&
941       !D->isInvalidDecl() &&
942       !D->isReferenced() &&
943       !D->isTopLevelDeclInObjCContainer() &&
944       D->getAccess() == AS_none &&
945       !D->isModulePrivate() &&
946       !needsAnonymousDeclarationNumber(D) &&
947       D->getDeclName().getNameKind() == DeclarationName::Identifier &&
948       !D->hasExtInfo() &&
949       D->getFirstDecl() == D->getMostRecentDecl() &&
950       D->getInitStyle() == VarDecl::CInit &&
951       D->getInit() == nullptr &&
952       !isa<ParmVarDecl>(D) &&
953       !isa<VarTemplateSpecializationDecl>(D) &&
954       !D->isConstexpr() &&
955       !D->isInitCapture() &&
956       !D->isPreviousDeclInSameBlockScope() &&
957       !D->getMemberSpecializationInfo())
958     AbbrevToUse = Writer.getDeclVarAbbrev();
959 
960   Code = serialization::DECL_VAR;
961 }
962 
963 void ASTDeclWriter::VisitImplicitParamDecl(ImplicitParamDecl *D) {
964   VisitVarDecl(D);
965   Code = serialization::DECL_IMPLICIT_PARAM;
966 }
967 
968 void ASTDeclWriter::VisitParmVarDecl(ParmVarDecl *D) {
969   VisitVarDecl(D);
970   Record.push_back(D->isObjCMethodParameter());
971   Record.push_back(D->getFunctionScopeDepth());
972   Record.push_back(D->getFunctionScopeIndex());
973   Record.push_back(D->getObjCDeclQualifier()); // FIXME: stable encoding
974   Record.push_back(D->isKNRPromoted());
975   Record.push_back(D->hasInheritedDefaultArg());
976   Record.push_back(D->hasUninstantiatedDefaultArg());
977   if (D->hasUninstantiatedDefaultArg())
978     Writer.AddStmt(D->getUninstantiatedDefaultArg());
979   Code = serialization::DECL_PARM_VAR;
980 
981   assert(!D->isARCPseudoStrong()); // can be true of ImplicitParamDecl
982 
983   // If the assumptions about the DECL_PARM_VAR abbrev are true, use it.  Here
984   // we dynamically check for the properties that we optimize for, but don't
985   // know are true of all PARM_VAR_DECLs.
986   if (D->getDeclContext() == D->getLexicalDeclContext() &&
987       !D->hasAttrs() &&
988       !D->hasExtInfo() &&
989       !D->isImplicit() &&
990       !D->isUsed(false) &&
991       !D->isInvalidDecl() &&
992       !D->isReferenced() &&
993       D->getAccess() == AS_none &&
994       !D->isModulePrivate() &&
995       D->getStorageClass() == 0 &&
996       D->getInitStyle() == VarDecl::CInit && // Can params have anything else?
997       D->getFunctionScopeDepth() == 0 &&
998       D->getObjCDeclQualifier() == 0 &&
999       !D->isKNRPromoted() &&
1000       !D->hasInheritedDefaultArg() &&
1001       D->getInit() == nullptr &&
1002       !D->hasUninstantiatedDefaultArg())  // No default expr.
1003     AbbrevToUse = Writer.getDeclParmVarAbbrev();
1004 
1005   // Check things we know are true of *every* PARM_VAR_DECL, which is more than
1006   // just us assuming it.
1007   assert(!D->getTSCSpec() && "PARM_VAR_DECL can't use TLS");
1008   assert(D->getAccess() == AS_none && "PARM_VAR_DECL can't be public/private");
1009   assert(!D->isExceptionVariable() && "PARM_VAR_DECL can't be exception var");
1010   assert(D->getPreviousDecl() == nullptr && "PARM_VAR_DECL can't be redecl");
1011   assert(!D->isStaticDataMember() &&
1012          "PARM_VAR_DECL can't be static data member");
1013 }
1014 
1015 void ASTDeclWriter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
1016   VisitDecl(D);
1017   Writer.AddStmt(D->getAsmString());
1018   Writer.AddSourceLocation(D->getRParenLoc(), Record);
1019   Code = serialization::DECL_FILE_SCOPE_ASM;
1020 }
1021 
1022 void ASTDeclWriter::VisitEmptyDecl(EmptyDecl *D) {
1023   VisitDecl(D);
1024   Code = serialization::DECL_EMPTY;
1025 }
1026 
1027 void ASTDeclWriter::VisitBlockDecl(BlockDecl *D) {
1028   VisitDecl(D);
1029   Writer.AddStmt(D->getBody());
1030   Writer.AddTypeSourceInfo(D->getSignatureAsWritten(), Record);
1031   Record.push_back(D->param_size());
1032   for (FunctionDecl::param_iterator P = D->param_begin(), PEnd = D->param_end();
1033        P != PEnd; ++P)
1034     Writer.AddDeclRef(*P, Record);
1035   Record.push_back(D->isVariadic());
1036   Record.push_back(D->blockMissingReturnType());
1037   Record.push_back(D->isConversionFromLambda());
1038   Record.push_back(D->capturesCXXThis());
1039   Record.push_back(D->getNumCaptures());
1040   for (const auto &capture : D->captures()) {
1041     Writer.AddDeclRef(capture.getVariable(), Record);
1042 
1043     unsigned flags = 0;
1044     if (capture.isByRef()) flags |= 1;
1045     if (capture.isNested()) flags |= 2;
1046     if (capture.hasCopyExpr()) flags |= 4;
1047     Record.push_back(flags);
1048 
1049     if (capture.hasCopyExpr()) Writer.AddStmt(capture.getCopyExpr());
1050   }
1051 
1052   Code = serialization::DECL_BLOCK;
1053 }
1054 
1055 void ASTDeclWriter::VisitCapturedDecl(CapturedDecl *CD) {
1056   Record.push_back(CD->getNumParams());
1057   VisitDecl(CD);
1058   Record.push_back(CD->getContextParamPosition());
1059   Record.push_back(CD->isNothrow() ? 1 : 0);
1060   // Body is stored by VisitCapturedStmt.
1061   for (unsigned I = 0; I < CD->getNumParams(); ++I)
1062     Writer.AddDeclRef(CD->getParam(I), Record);
1063   Code = serialization::DECL_CAPTURED;
1064 }
1065 
1066 void ASTDeclWriter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
1067   VisitDecl(D);
1068   Record.push_back(D->getLanguage());
1069   Writer.AddSourceLocation(D->getExternLoc(), Record);
1070   Writer.AddSourceLocation(D->getRBraceLoc(), Record);
1071   Code = serialization::DECL_LINKAGE_SPEC;
1072 }
1073 
1074 void ASTDeclWriter::VisitLabelDecl(LabelDecl *D) {
1075   VisitNamedDecl(D);
1076   Writer.AddSourceLocation(D->getLocStart(), Record);
1077   Code = serialization::DECL_LABEL;
1078 }
1079 
1080 
1081 void ASTDeclWriter::VisitNamespaceDecl(NamespaceDecl *D) {
1082   VisitRedeclarable(D);
1083   VisitNamedDecl(D);
1084   Record.push_back(D->isInline());
1085   Writer.AddSourceLocation(D->getLocStart(), Record);
1086   Writer.AddSourceLocation(D->getRBraceLoc(), Record);
1087 
1088   if (D->isOriginalNamespace())
1089     Writer.AddDeclRef(D->getAnonymousNamespace(), Record);
1090   Code = serialization::DECL_NAMESPACE;
1091 
1092   if (Writer.hasChain() && D->isAnonymousNamespace() &&
1093       D == D->getMostRecentDecl()) {
1094     // This is a most recent reopening of the anonymous namespace. If its parent
1095     // is in a previous PCH (or is the TU), mark that parent for update, because
1096     // the original namespace always points to the latest re-opening of its
1097     // anonymous namespace.
1098     Decl *Parent = cast<Decl>(
1099         D->getParent()->getRedeclContext()->getPrimaryContext());
1100     if (Parent->isFromASTFile() || isa<TranslationUnitDecl>(Parent)) {
1101       Writer.DeclUpdates[Parent].push_back(
1102           ASTWriter::DeclUpdate(UPD_CXX_ADDED_ANONYMOUS_NAMESPACE, D));
1103     }
1104   }
1105 }
1106 
1107 void ASTDeclWriter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
1108   VisitRedeclarable(D);
1109   VisitNamedDecl(D);
1110   Writer.AddSourceLocation(D->getNamespaceLoc(), Record);
1111   Writer.AddSourceLocation(D->getTargetNameLoc(), Record);
1112   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
1113   Writer.AddDeclRef(D->getNamespace(), Record);
1114   Code = serialization::DECL_NAMESPACE_ALIAS;
1115 }
1116 
1117 void ASTDeclWriter::VisitUsingDecl(UsingDecl *D) {
1118   VisitNamedDecl(D);
1119   Writer.AddSourceLocation(D->getUsingLoc(), Record);
1120   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
1121   Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
1122   Writer.AddDeclRef(D->FirstUsingShadow.getPointer(), Record);
1123   Record.push_back(D->hasTypename());
1124   Writer.AddDeclRef(Context.getInstantiatedFromUsingDecl(D), Record);
1125   Code = serialization::DECL_USING;
1126 }
1127 
1128 void ASTDeclWriter::VisitUsingShadowDecl(UsingShadowDecl *D) {
1129   VisitRedeclarable(D);
1130   VisitNamedDecl(D);
1131   Writer.AddDeclRef(D->getTargetDecl(), Record);
1132   Writer.AddDeclRef(D->UsingOrNextShadow, Record);
1133   Writer.AddDeclRef(Context.getInstantiatedFromUsingShadowDecl(D), Record);
1134   Code = serialization::DECL_USING_SHADOW;
1135 }
1136 
1137 void ASTDeclWriter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
1138   VisitNamedDecl(D);
1139   Writer.AddSourceLocation(D->getUsingLoc(), Record);
1140   Writer.AddSourceLocation(D->getNamespaceKeyLocation(), Record);
1141   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
1142   Writer.AddDeclRef(D->getNominatedNamespace(), Record);
1143   Writer.AddDeclRef(dyn_cast<Decl>(D->getCommonAncestor()), Record);
1144   Code = serialization::DECL_USING_DIRECTIVE;
1145 }
1146 
1147 void ASTDeclWriter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
1148   VisitValueDecl(D);
1149   Writer.AddSourceLocation(D->getUsingLoc(), Record);
1150   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
1151   Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
1152   Code = serialization::DECL_UNRESOLVED_USING_VALUE;
1153 }
1154 
1155 void ASTDeclWriter::VisitUnresolvedUsingTypenameDecl(
1156                                                UnresolvedUsingTypenameDecl *D) {
1157   VisitTypeDecl(D);
1158   Writer.AddSourceLocation(D->getTypenameLoc(), Record);
1159   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
1160   Code = serialization::DECL_UNRESOLVED_USING_TYPENAME;
1161 }
1162 
1163 void ASTDeclWriter::VisitCXXRecordDecl(CXXRecordDecl *D) {
1164   VisitRecordDecl(D);
1165 
1166   enum {
1167     CXXRecNotTemplate = 0, CXXRecTemplate, CXXRecMemberSpecialization
1168   };
1169   if (ClassTemplateDecl *TemplD = D->getDescribedClassTemplate()) {
1170     Record.push_back(CXXRecTemplate);
1171     Writer.AddDeclRef(TemplD, Record);
1172   } else if (MemberSpecializationInfo *MSInfo
1173                = D->getMemberSpecializationInfo()) {
1174     Record.push_back(CXXRecMemberSpecialization);
1175     Writer.AddDeclRef(MSInfo->getInstantiatedFrom(), Record);
1176     Record.push_back(MSInfo->getTemplateSpecializationKind());
1177     Writer.AddSourceLocation(MSInfo->getPointOfInstantiation(), Record);
1178   } else {
1179     Record.push_back(CXXRecNotTemplate);
1180   }
1181 
1182   Record.push_back(D->isThisDeclarationADefinition());
1183   if (D->isThisDeclarationADefinition())
1184     Writer.AddCXXDefinitionData(D, Record);
1185 
1186   // Store (what we currently believe to be) the key function to avoid
1187   // deserializing every method so we can compute it.
1188   if (D->IsCompleteDefinition)
1189     Writer.AddDeclRef(Context.getCurrentKeyFunction(D), Record);
1190 
1191   Code = serialization::DECL_CXX_RECORD;
1192 }
1193 
1194 void ASTDeclWriter::VisitCXXMethodDecl(CXXMethodDecl *D) {
1195   VisitFunctionDecl(D);
1196   if (D->isCanonicalDecl()) {
1197     Record.push_back(D->size_overridden_methods());
1198     for (CXXMethodDecl::method_iterator
1199            I = D->begin_overridden_methods(), E = D->end_overridden_methods();
1200            I != E; ++I)
1201       Writer.AddDeclRef(*I, Record);
1202   } else {
1203     // We only need to record overridden methods once for the canonical decl.
1204     Record.push_back(0);
1205   }
1206 
1207   if (D->getDeclContext() == D->getLexicalDeclContext() &&
1208       D->getFirstDecl() == D->getMostRecentDecl() &&
1209       !D->isInvalidDecl() &&
1210       !D->hasAttrs() &&
1211       !D->isTopLevelDeclInObjCContainer() &&
1212       D->getDeclName().getNameKind() == DeclarationName::Identifier &&
1213       !D->hasExtInfo() &&
1214       !D->hasInheritedPrototype() &&
1215       D->hasWrittenPrototype())
1216     AbbrevToUse = Writer.getDeclCXXMethodAbbrev();
1217 
1218   Code = serialization::DECL_CXX_METHOD;
1219 }
1220 
1221 void ASTDeclWriter::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
1222   VisitCXXMethodDecl(D);
1223 
1224   Writer.AddDeclRef(D->getInheritedConstructor(), Record);
1225   Record.push_back(D->IsExplicitSpecified);
1226 
1227   Code = serialization::DECL_CXX_CONSTRUCTOR;
1228 }
1229 
1230 void ASTDeclWriter::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
1231   VisitCXXMethodDecl(D);
1232 
1233   Writer.AddDeclRef(D->getOperatorDelete(), Record);
1234 
1235   Code = serialization::DECL_CXX_DESTRUCTOR;
1236 }
1237 
1238 void ASTDeclWriter::VisitCXXConversionDecl(CXXConversionDecl *D) {
1239   VisitCXXMethodDecl(D);
1240   Record.push_back(D->IsExplicitSpecified);
1241   Code = serialization::DECL_CXX_CONVERSION;
1242 }
1243 
1244 void ASTDeclWriter::VisitImportDecl(ImportDecl *D) {
1245   VisitDecl(D);
1246   Record.push_back(Writer.getSubmoduleID(D->getImportedModule()));
1247   ArrayRef<SourceLocation> IdentifierLocs = D->getIdentifierLocs();
1248   Record.push_back(!IdentifierLocs.empty());
1249   if (IdentifierLocs.empty()) {
1250     Writer.AddSourceLocation(D->getLocEnd(), Record);
1251     Record.push_back(1);
1252   } else {
1253     for (unsigned I = 0, N = IdentifierLocs.size(); I != N; ++I)
1254       Writer.AddSourceLocation(IdentifierLocs[I], Record);
1255     Record.push_back(IdentifierLocs.size());
1256   }
1257   // Note: the number of source locations must always be the last element in
1258   // the record.
1259   Code = serialization::DECL_IMPORT;
1260 }
1261 
1262 void ASTDeclWriter::VisitAccessSpecDecl(AccessSpecDecl *D) {
1263   VisitDecl(D);
1264   Writer.AddSourceLocation(D->getColonLoc(), Record);
1265   Code = serialization::DECL_ACCESS_SPEC;
1266 }
1267 
1268 void ASTDeclWriter::VisitFriendDecl(FriendDecl *D) {
1269   // Record the number of friend type template parameter lists here
1270   // so as to simplify memory allocation during deserialization.
1271   Record.push_back(D->NumTPLists);
1272   VisitDecl(D);
1273   bool hasFriendDecl = D->Friend.is<NamedDecl*>();
1274   Record.push_back(hasFriendDecl);
1275   if (hasFriendDecl)
1276     Writer.AddDeclRef(D->getFriendDecl(), Record);
1277   else
1278     Writer.AddTypeSourceInfo(D->getFriendType(), Record);
1279   for (unsigned i = 0; i < D->NumTPLists; ++i)
1280     Writer.AddTemplateParameterList(D->getFriendTypeTemplateParameterList(i),
1281                                     Record);
1282   Writer.AddDeclRef(D->getNextFriend(), Record);
1283   Record.push_back(D->UnsupportedFriend);
1284   Writer.AddSourceLocation(D->FriendLoc, Record);
1285   Code = serialization::DECL_FRIEND;
1286 }
1287 
1288 void ASTDeclWriter::VisitFriendTemplateDecl(FriendTemplateDecl *D) {
1289   VisitDecl(D);
1290   Record.push_back(D->getNumTemplateParameters());
1291   for (unsigned i = 0, e = D->getNumTemplateParameters(); i != e; ++i)
1292     Writer.AddTemplateParameterList(D->getTemplateParameterList(i), Record);
1293   Record.push_back(D->getFriendDecl() != nullptr);
1294   if (D->getFriendDecl())
1295     Writer.AddDeclRef(D->getFriendDecl(), Record);
1296   else
1297     Writer.AddTypeSourceInfo(D->getFriendType(), Record);
1298   Writer.AddSourceLocation(D->getFriendLoc(), Record);
1299   Code = serialization::DECL_FRIEND_TEMPLATE;
1300 }
1301 
1302 void ASTDeclWriter::VisitTemplateDecl(TemplateDecl *D) {
1303   VisitNamedDecl(D);
1304 
1305   Writer.AddDeclRef(D->getTemplatedDecl(), Record);
1306   Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1307 }
1308 
1309 void ASTDeclWriter::VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D) {
1310   VisitRedeclarable(D);
1311 
1312   // Emit data to initialize CommonOrPrev before VisitTemplateDecl so that
1313   // getCommonPtr() can be used while this is still initializing.
1314   if (D->isFirstDecl()) {
1315     // This declaration owns the 'common' pointer, so serialize that data now.
1316     Writer.AddDeclRef(D->getInstantiatedFromMemberTemplate(), Record);
1317     if (D->getInstantiatedFromMemberTemplate())
1318       Record.push_back(D->isMemberSpecialization());
1319   }
1320 
1321   VisitTemplateDecl(D);
1322   Record.push_back(D->getIdentifierNamespace());
1323 }
1324 
1325 void ASTDeclWriter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1326   VisitRedeclarableTemplateDecl(D);
1327 
1328   if (D->isFirstDecl())
1329     AddTemplateSpecializations(D);
1330   Code = serialization::DECL_CLASS_TEMPLATE;
1331 }
1332 
1333 void ASTDeclWriter::VisitClassTemplateSpecializationDecl(
1334                                            ClassTemplateSpecializationDecl *D) {
1335   RegisterTemplateSpecialization(D->getSpecializedTemplate(), D);
1336 
1337   VisitCXXRecordDecl(D);
1338 
1339   llvm::PointerUnion<ClassTemplateDecl *,
1340                      ClassTemplatePartialSpecializationDecl *> InstFrom
1341     = D->getSpecializedTemplateOrPartial();
1342   if (Decl *InstFromD = InstFrom.dyn_cast<ClassTemplateDecl *>()) {
1343     Writer.AddDeclRef(InstFromD, Record);
1344   } else {
1345     Writer.AddDeclRef(InstFrom.get<ClassTemplatePartialSpecializationDecl *>(),
1346                       Record);
1347     Writer.AddTemplateArgumentList(&D->getTemplateInstantiationArgs(), Record);
1348   }
1349 
1350   Writer.AddTemplateArgumentList(&D->getTemplateArgs(), Record);
1351   Writer.AddSourceLocation(D->getPointOfInstantiation(), Record);
1352   Record.push_back(D->getSpecializationKind());
1353   Record.push_back(D->isCanonicalDecl());
1354 
1355   if (D->isCanonicalDecl()) {
1356     // When reading, we'll add it to the folding set of the following template.
1357     Writer.AddDeclRef(D->getSpecializedTemplate()->getCanonicalDecl(), Record);
1358   }
1359 
1360   // Explicit info.
1361   Writer.AddTypeSourceInfo(D->getTypeAsWritten(), Record);
1362   if (D->getTypeAsWritten()) {
1363     Writer.AddSourceLocation(D->getExternLoc(), Record);
1364     Writer.AddSourceLocation(D->getTemplateKeywordLoc(), Record);
1365   }
1366 
1367   Code = serialization::DECL_CLASS_TEMPLATE_SPECIALIZATION;
1368 }
1369 
1370 void ASTDeclWriter::VisitClassTemplatePartialSpecializationDecl(
1371                                     ClassTemplatePartialSpecializationDecl *D) {
1372   VisitClassTemplateSpecializationDecl(D);
1373 
1374   Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1375   Writer.AddASTTemplateArgumentListInfo(D->getTemplateArgsAsWritten(), Record);
1376 
1377   // These are read/set from/to the first declaration.
1378   if (D->getPreviousDecl() == nullptr) {
1379     Writer.AddDeclRef(D->getInstantiatedFromMember(), Record);
1380     Record.push_back(D->isMemberSpecialization());
1381   }
1382 
1383   Code = serialization::DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION;
1384 }
1385 
1386 void ASTDeclWriter::VisitVarTemplateDecl(VarTemplateDecl *D) {
1387   VisitRedeclarableTemplateDecl(D);
1388 
1389   if (D->isFirstDecl())
1390     AddTemplateSpecializations(D);
1391   Code = serialization::DECL_VAR_TEMPLATE;
1392 }
1393 
1394 void ASTDeclWriter::VisitVarTemplateSpecializationDecl(
1395     VarTemplateSpecializationDecl *D) {
1396   RegisterTemplateSpecialization(D->getSpecializedTemplate(), D);
1397 
1398   VisitVarDecl(D);
1399 
1400   llvm::PointerUnion<VarTemplateDecl *, VarTemplatePartialSpecializationDecl *>
1401   InstFrom = D->getSpecializedTemplateOrPartial();
1402   if (Decl *InstFromD = InstFrom.dyn_cast<VarTemplateDecl *>()) {
1403     Writer.AddDeclRef(InstFromD, Record);
1404   } else {
1405     Writer.AddDeclRef(InstFrom.get<VarTemplatePartialSpecializationDecl *>(),
1406                       Record);
1407     Writer.AddTemplateArgumentList(&D->getTemplateInstantiationArgs(), Record);
1408   }
1409 
1410   // Explicit info.
1411   Writer.AddTypeSourceInfo(D->getTypeAsWritten(), Record);
1412   if (D->getTypeAsWritten()) {
1413     Writer.AddSourceLocation(D->getExternLoc(), Record);
1414     Writer.AddSourceLocation(D->getTemplateKeywordLoc(), Record);
1415   }
1416 
1417   Writer.AddTemplateArgumentList(&D->getTemplateArgs(), Record);
1418   Writer.AddSourceLocation(D->getPointOfInstantiation(), Record);
1419   Record.push_back(D->getSpecializationKind());
1420   Record.push_back(D->isCanonicalDecl());
1421 
1422   if (D->isCanonicalDecl()) {
1423     // When reading, we'll add it to the folding set of the following template.
1424     Writer.AddDeclRef(D->getSpecializedTemplate()->getCanonicalDecl(), Record);
1425   }
1426 
1427   Code = serialization::DECL_VAR_TEMPLATE_SPECIALIZATION;
1428 }
1429 
1430 void ASTDeclWriter::VisitVarTemplatePartialSpecializationDecl(
1431     VarTemplatePartialSpecializationDecl *D) {
1432   VisitVarTemplateSpecializationDecl(D);
1433 
1434   Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1435   Writer.AddASTTemplateArgumentListInfo(D->getTemplateArgsAsWritten(), Record);
1436 
1437   // These are read/set from/to the first declaration.
1438   if (D->getPreviousDecl() == nullptr) {
1439     Writer.AddDeclRef(D->getInstantiatedFromMember(), Record);
1440     Record.push_back(D->isMemberSpecialization());
1441   }
1442 
1443   Code = serialization::DECL_VAR_TEMPLATE_PARTIAL_SPECIALIZATION;
1444 }
1445 
1446 void ASTDeclWriter::VisitClassScopeFunctionSpecializationDecl(
1447                                     ClassScopeFunctionSpecializationDecl *D) {
1448   VisitDecl(D);
1449   Writer.AddDeclRef(D->getSpecialization(), Record);
1450   Code = serialization::DECL_CLASS_SCOPE_FUNCTION_SPECIALIZATION;
1451 }
1452 
1453 
1454 void ASTDeclWriter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1455   VisitRedeclarableTemplateDecl(D);
1456 
1457   if (D->isFirstDecl())
1458     AddTemplateSpecializations(D);
1459   Code = serialization::DECL_FUNCTION_TEMPLATE;
1460 }
1461 
1462 void ASTDeclWriter::VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D) {
1463   VisitTypeDecl(D);
1464 
1465   Record.push_back(D->wasDeclaredWithTypename());
1466 
1467   bool OwnsDefaultArg = D->hasDefaultArgument() &&
1468                         !D->defaultArgumentWasInherited();
1469   Record.push_back(OwnsDefaultArg);
1470   if (OwnsDefaultArg)
1471     Writer.AddTypeSourceInfo(D->getDefaultArgumentInfo(), Record);
1472 
1473   Code = serialization::DECL_TEMPLATE_TYPE_PARM;
1474 }
1475 
1476 void ASTDeclWriter::VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {
1477   // For an expanded parameter pack, record the number of expansion types here
1478   // so that it's easier for deserialization to allocate the right amount of
1479   // memory.
1480   if (D->isExpandedParameterPack())
1481     Record.push_back(D->getNumExpansionTypes());
1482 
1483   VisitDeclaratorDecl(D);
1484   // TemplateParmPosition.
1485   Record.push_back(D->getDepth());
1486   Record.push_back(D->getPosition());
1487 
1488   if (D->isExpandedParameterPack()) {
1489     for (unsigned I = 0, N = D->getNumExpansionTypes(); I != N; ++I) {
1490       Writer.AddTypeRef(D->getExpansionType(I), Record);
1491       Writer.AddTypeSourceInfo(D->getExpansionTypeSourceInfo(I), Record);
1492     }
1493 
1494     Code = serialization::DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK;
1495   } else {
1496     // Rest of NonTypeTemplateParmDecl.
1497     Record.push_back(D->isParameterPack());
1498     bool OwnsDefaultArg = D->hasDefaultArgument() &&
1499                           !D->defaultArgumentWasInherited();
1500     Record.push_back(OwnsDefaultArg);
1501     if (OwnsDefaultArg)
1502       Writer.AddStmt(D->getDefaultArgument());
1503     Code = serialization::DECL_NON_TYPE_TEMPLATE_PARM;
1504   }
1505 }
1506 
1507 void ASTDeclWriter::VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D) {
1508   // For an expanded parameter pack, record the number of expansion types here
1509   // so that it's easier for deserialization to allocate the right amount of
1510   // memory.
1511   if (D->isExpandedParameterPack())
1512     Record.push_back(D->getNumExpansionTemplateParameters());
1513 
1514   VisitTemplateDecl(D);
1515   // TemplateParmPosition.
1516   Record.push_back(D->getDepth());
1517   Record.push_back(D->getPosition());
1518 
1519   if (D->isExpandedParameterPack()) {
1520     for (unsigned I = 0, N = D->getNumExpansionTemplateParameters();
1521          I != N; ++I)
1522       Writer.AddTemplateParameterList(D->getExpansionTemplateParameters(I),
1523                                       Record);
1524     Code = serialization::DECL_EXPANDED_TEMPLATE_TEMPLATE_PARM_PACK;
1525   } else {
1526     // Rest of TemplateTemplateParmDecl.
1527     Record.push_back(D->isParameterPack());
1528     bool OwnsDefaultArg = D->hasDefaultArgument() &&
1529                           !D->defaultArgumentWasInherited();
1530     Record.push_back(OwnsDefaultArg);
1531     if (OwnsDefaultArg)
1532       Writer.AddTemplateArgumentLoc(D->getDefaultArgument(), Record);
1533     Code = serialization::DECL_TEMPLATE_TEMPLATE_PARM;
1534   }
1535 }
1536 
1537 void ASTDeclWriter::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) {
1538   VisitRedeclarableTemplateDecl(D);
1539   Code = serialization::DECL_TYPE_ALIAS_TEMPLATE;
1540 }
1541 
1542 void ASTDeclWriter::VisitStaticAssertDecl(StaticAssertDecl *D) {
1543   VisitDecl(D);
1544   Writer.AddStmt(D->getAssertExpr());
1545   Record.push_back(D->isFailed());
1546   Writer.AddStmt(D->getMessage());
1547   Writer.AddSourceLocation(D->getRParenLoc(), Record);
1548   Code = serialization::DECL_STATIC_ASSERT;
1549 }
1550 
1551 /// \brief Emit the DeclContext part of a declaration context decl.
1552 ///
1553 /// \param LexicalOffset the offset at which the DECL_CONTEXT_LEXICAL
1554 /// block for this declaration context is stored. May be 0 to indicate
1555 /// that there are no declarations stored within this context.
1556 ///
1557 /// \param VisibleOffset the offset at which the DECL_CONTEXT_VISIBLE
1558 /// block for this declaration context is stored. May be 0 to indicate
1559 /// that there are no declarations visible from this context. Note
1560 /// that this value will not be emitted for non-primary declaration
1561 /// contexts.
1562 void ASTDeclWriter::VisitDeclContext(DeclContext *DC, uint64_t LexicalOffset,
1563                                      uint64_t VisibleOffset) {
1564   AddLocalOffset(LexicalOffset);
1565   AddLocalOffset(VisibleOffset);
1566 }
1567 
1568 const Decl *ASTWriter::getFirstLocalDecl(const Decl *D) {
1569   /// \brief Is this a local declaration (that is, one that will be written to
1570   /// our AST file)? This is the case for declarations that are neither imported
1571   /// from another AST file nor predefined.
1572   auto IsLocalDecl = [&](const Decl *D) -> bool {
1573     if (D->isFromASTFile())
1574       return false;
1575     auto I = DeclIDs.find(D);
1576     return (I == DeclIDs.end() || I->second >= NUM_PREDEF_DECL_IDS);
1577   };
1578 
1579   assert(IsLocalDecl(D) && "expected a local declaration");
1580 
1581   const Decl *Canon = D->getCanonicalDecl();
1582   if (IsLocalDecl(Canon))
1583     return Canon;
1584 
1585   const Decl *&CacheEntry = FirstLocalDeclCache[Canon];
1586   if (CacheEntry)
1587     return CacheEntry;
1588 
1589   for (const Decl *Redecl = D; Redecl; Redecl = Redecl->getPreviousDecl())
1590     if (IsLocalDecl(Redecl))
1591       D = Redecl;
1592   return CacheEntry = D;
1593 }
1594 
1595 template <typename T>
1596 void ASTDeclWriter::VisitRedeclarable(Redeclarable<T> *D) {
1597   T *First = D->getFirstDecl();
1598   T *MostRecent = First->getMostRecentDecl();
1599   T *DAsT = static_cast<T *>(D);
1600   if (MostRecent != First) {
1601     assert(isRedeclarableDeclKind(DAsT->getKind()) &&
1602            "Not considered redeclarable?");
1603 
1604     Writer.AddDeclRef(First, Record);
1605 
1606     // Write out a list of local redeclarations of this declaration if it's the
1607     // first local declaration in the chain.
1608     const Decl *FirstLocal = Writer.getFirstLocalDecl(DAsT);
1609     if (DAsT == FirstLocal) {
1610       // Emit a list of all imported first declarations so that we can be sure
1611       // that all redeclarations visible to this module are before D in the
1612       // redecl chain.
1613       unsigned I = Record.size();
1614       Record.push_back(0);
1615       if (Writer.Chain)
1616         AddFirstDeclFromEachModule(DAsT, /*IncludeLocal*/false);
1617       // This is the number of imported first declarations + 1.
1618       Record[I] = Record.size() - I;
1619 
1620       // Collect the set of local redeclarations of this declaration, from
1621       // newest to oldest.
1622       RecordData LocalRedecls;
1623       for (const Decl *Prev = FirstLocal->getMostRecentDecl();
1624            Prev != FirstLocal; Prev = Prev->getPreviousDecl())
1625         if (!Prev->isFromASTFile())
1626           Writer.AddDeclRef(Prev, LocalRedecls);
1627 
1628       // If we have any redecls, write them now as a separate record preceding
1629       // the declaration itself.
1630       if (LocalRedecls.empty())
1631         Record.push_back(0);
1632       else {
1633         auto Start = Writer.Stream.GetCurrentBitNo();
1634         Writer.Stream.EmitRecord(LOCAL_REDECLARATIONS, LocalRedecls);
1635         AddLocalOffset(Start);
1636       }
1637     } else {
1638       Record.push_back(0);
1639       Writer.AddDeclRef(FirstLocal, Record);
1640     }
1641 
1642     // Make sure that we serialize both the previous and the most-recent
1643     // declarations, which (transitively) ensures that all declarations in the
1644     // chain get serialized.
1645     //
1646     // FIXME: This is not correct; when we reach an imported declaration we
1647     // won't emit its previous declaration.
1648     (void)Writer.GetDeclRef(D->getPreviousDecl());
1649     (void)Writer.GetDeclRef(MostRecent);
1650   } else {
1651     // We use the sentinel value 0 to indicate an only declaration.
1652     Record.push_back(0);
1653   }
1654 }
1655 
1656 void ASTDeclWriter::VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D) {
1657   Record.push_back(D->varlist_size());
1658   VisitDecl(D);
1659   for (auto *I : D->varlists())
1660     Writer.AddStmt(I);
1661   Code = serialization::DECL_OMP_THREADPRIVATE;
1662 }
1663 
1664 void ASTDeclWriter::VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D) {
1665   VisitValueDecl(D);
1666   Writer.AddSourceLocation(D->getLocStart(), Record);
1667   Writer.AddStmt(D->getCombiner());
1668   Writer.AddStmt(D->getInitializer());
1669   Writer.AddDeclRef(D->getPrevDeclInScope(), Record);
1670   Code = serialization::DECL_OMP_DECLARE_REDUCTION;
1671 }
1672 
1673 void ASTDeclWriter::VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D) {
1674   VisitVarDecl(D);
1675   Code = serialization::DECL_OMP_CAPTUREDEXPR;
1676 }
1677 
1678 //===----------------------------------------------------------------------===//
1679 // ASTWriter Implementation
1680 //===----------------------------------------------------------------------===//
1681 
1682 void ASTWriter::WriteDeclAbbrevs() {
1683   using namespace llvm;
1684 
1685   BitCodeAbbrev *Abv;
1686 
1687   // Abbreviation for DECL_FIELD
1688   Abv = new BitCodeAbbrev();
1689   Abv->Add(BitCodeAbbrevOp(serialization::DECL_FIELD));
1690   // Decl
1691   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1692   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1693   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1694   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1695   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1696   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1697   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1698   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1699   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1700   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1701   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1702   // NamedDecl
1703   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1704   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1705   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1706   // ValueDecl
1707   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1708   // DeclaratorDecl
1709   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1710   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1711   // FieldDecl
1712   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1713   Abv->Add(BitCodeAbbrevOp(0));                       //getBitWidth
1714   // Type Source Info
1715   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1716   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1717   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1718   DeclFieldAbbrev = Stream.EmitAbbrev(Abv);
1719 
1720   // Abbreviation for DECL_OBJC_IVAR
1721   Abv = new BitCodeAbbrev();
1722   Abv->Add(BitCodeAbbrevOp(serialization::DECL_OBJC_IVAR));
1723   // Decl
1724   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1725   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1726   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1727   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1728   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1729   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1730   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1731   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1732   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1733   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1734   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1735   // NamedDecl
1736   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1737   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1738   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1739   // ValueDecl
1740   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1741   // DeclaratorDecl
1742   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1743   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1744   // FieldDecl
1745   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1746   Abv->Add(BitCodeAbbrevOp(0));                       //getBitWidth
1747   // ObjC Ivar
1748   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getAccessControl
1749   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getSynthesize
1750   // Type Source Info
1751   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1752   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1753   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1754   DeclObjCIvarAbbrev = Stream.EmitAbbrev(Abv);
1755 
1756   // Abbreviation for DECL_ENUM
1757   Abv = new BitCodeAbbrev();
1758   Abv->Add(BitCodeAbbrevOp(serialization::DECL_ENUM));
1759   // Redeclarable
1760   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1761   // Decl
1762   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1763   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1764   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1765   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1766   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1767   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1768   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1769   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1770   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1771   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1772   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1773   // NamedDecl
1774   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1775   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1776   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1777   // TypeDecl
1778   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1779   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1780   // TagDecl
1781   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1782   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1783   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1784   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1785   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1786   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsCompleteDefinitionRequired
1787   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1788   Abv->Add(BitCodeAbbrevOp(0));                         // ExtInfoKind
1789   // EnumDecl
1790   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // AddTypeRef
1791   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IntegerType
1792   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getPromotionType
1793   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumPositiveBits
1794   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumNegativeBits
1795   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScoped
1796   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScopedUsingClassTag
1797   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isFixed
1798   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // InstantiatedMembEnum
1799   // DC
1800   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1801   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1802   DeclEnumAbbrev = Stream.EmitAbbrev(Abv);
1803 
1804   // Abbreviation for DECL_RECORD
1805   Abv = new BitCodeAbbrev();
1806   Abv->Add(BitCodeAbbrevOp(serialization::DECL_RECORD));
1807   // Redeclarable
1808   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1809   // Decl
1810   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1811   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1812   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1813   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1814   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1815   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1816   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1817   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1818   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1819   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1820   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1821   // NamedDecl
1822   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1823   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1824   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1825   // TypeDecl
1826   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1827   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1828   // TagDecl
1829   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1830   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1831   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1832   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1833   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1834   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsCompleteDefinitionRequired
1835   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1836   Abv->Add(BitCodeAbbrevOp(0));                         // ExtInfoKind
1837   // RecordDecl
1838   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // FlexibleArrayMember
1839   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // AnonymousStructUnion
1840   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasObjectMember
1841   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasVolatileMember
1842   // DC
1843   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1844   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1845   DeclRecordAbbrev = Stream.EmitAbbrev(Abv);
1846 
1847   // Abbreviation for DECL_PARM_VAR
1848   Abv = new BitCodeAbbrev();
1849   Abv->Add(BitCodeAbbrevOp(serialization::DECL_PARM_VAR));
1850   // Redeclarable
1851   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1852   // Decl
1853   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1854   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1855   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1856   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1857   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1858   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1859   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1860   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1861   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1862   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1863   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1864   // NamedDecl
1865   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1866   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1867   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1868   // ValueDecl
1869   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1870   // DeclaratorDecl
1871   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1872   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1873   // VarDecl
1874   Abv->Add(BitCodeAbbrevOp(0));                       // StorageClass
1875   Abv->Add(BitCodeAbbrevOp(0));                       // getTSCSpec
1876   Abv->Add(BitCodeAbbrevOp(0));                       // hasCXXDirectInitializer
1877   Abv->Add(BitCodeAbbrevOp(0));                       // Linkage
1878   Abv->Add(BitCodeAbbrevOp(0));                       // HasInit
1879   Abv->Add(BitCodeAbbrevOp(0));                   // HasMemberSpecializationInfo
1880   // ParmVarDecl
1881   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsObjCMethodParameter
1882   Abv->Add(BitCodeAbbrevOp(0));                       // ScopeDepth
1883   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ScopeIndex
1884   Abv->Add(BitCodeAbbrevOp(0));                       // ObjCDeclQualifier
1885   Abv->Add(BitCodeAbbrevOp(0));                       // KNRPromoted
1886   Abv->Add(BitCodeAbbrevOp(0));                       // HasInheritedDefaultArg
1887   Abv->Add(BitCodeAbbrevOp(0));                   // HasUninstantiatedDefaultArg
1888   // Type Source Info
1889   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1890   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1891   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1892   DeclParmVarAbbrev = Stream.EmitAbbrev(Abv);
1893 
1894   // Abbreviation for DECL_TYPEDEF
1895   Abv = new BitCodeAbbrev();
1896   Abv->Add(BitCodeAbbrevOp(serialization::DECL_TYPEDEF));
1897   // Redeclarable
1898   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1899   // Decl
1900   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1901   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1902   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1903   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1904   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1905   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isUsed
1906   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isReferenced
1907   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1908   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // C++ AccessSpecifier
1909   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1910   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1911   // NamedDecl
1912   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1913   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1914   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1915   // TypeDecl
1916   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1917   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1918   // TypedefDecl
1919   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1920   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1921   DeclTypedefAbbrev = Stream.EmitAbbrev(Abv);
1922 
1923   // Abbreviation for DECL_VAR
1924   Abv = new BitCodeAbbrev();
1925   Abv->Add(BitCodeAbbrevOp(serialization::DECL_VAR));
1926   // Redeclarable
1927   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1928   // Decl
1929   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1930   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1931   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1932   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1933   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1934   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1935   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1936   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1937   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1938   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1939   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1940   // NamedDecl
1941   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1942   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1943   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1944   // ValueDecl
1945   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1946   // DeclaratorDecl
1947   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1948   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1949   // VarDecl
1950   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // StorageClass
1951   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // getTSCSpec
1952   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // CXXDirectInitializer
1953   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isExceptionVariable
1954   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isNRVOVariable
1955   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCXXForRangeDecl
1956   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isARCPseudoStrong
1957   Abv->Add(BitCodeAbbrevOp(0));                         // isConstexpr
1958   Abv->Add(BitCodeAbbrevOp(0));                         // isInitCapture
1959   Abv->Add(BitCodeAbbrevOp(0));                         // isPrevDeclInSameScope
1960   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Linkage
1961   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // HasInit
1962   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // HasMemberSpecInfo
1963   // Type Source Info
1964   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1965   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1966   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1967   DeclVarAbbrev = Stream.EmitAbbrev(Abv);
1968 
1969   // Abbreviation for DECL_CXX_METHOD
1970   Abv = new BitCodeAbbrev();
1971   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CXX_METHOD));
1972   // RedeclarableDecl
1973   Abv->Add(BitCodeAbbrevOp(0));                         // CanonicalDecl
1974   // Decl
1975   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // DeclContext
1976   Abv->Add(BitCodeAbbrevOp(0));                         // LexicalDeclContext
1977   Abv->Add(BitCodeAbbrevOp(0));                         // Invalid
1978   Abv->Add(BitCodeAbbrevOp(0));                         // HasAttrs
1979   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Implicit
1980   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Used
1981   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Referenced
1982   Abv->Add(BitCodeAbbrevOp(0));                         // InObjCContainer
1983   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // Access
1984   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ModulePrivate
1985   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SubmoduleID
1986   // NamedDecl
1987   Abv->Add(BitCodeAbbrevOp(DeclarationName::Identifier)); // NameKind
1988   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // Identifier
1989   Abv->Add(BitCodeAbbrevOp(0));                         // AnonDeclNumber
1990   // ValueDecl
1991   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // Type
1992   // DeclaratorDecl
1993   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // InnerLocStart
1994   Abv->Add(BitCodeAbbrevOp(0));                         // HasExtInfo
1995   // FunctionDecl
1996   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 11)); // IDNS
1997   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // StorageClass
1998   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Inline
1999   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InlineSpecified
2000   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // VirtualAsWritten
2001   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Pure
2002   Abv->Add(BitCodeAbbrevOp(0));                         // HasInheritedProto
2003   Abv->Add(BitCodeAbbrevOp(1));                         // HasWrittenProto
2004   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Deleted
2005   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Trivial
2006   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Defaulted
2007   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ExplicitlyDefaulted
2008   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ImplicitReturnZero
2009   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constexpr
2010   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // SkippedBody
2011   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // LateParsed
2012   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Linkage
2013   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LocEnd
2014   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // TemplateKind
2015   // This Array slurps the rest of the record. Fortunately we want to encode
2016   // (nearly) all the remaining (variable number of) fields in the same way.
2017   //
2018   // This is the function template information if any, then
2019   //         NumParams and Params[] from FunctionDecl, and
2020   //         NumOverriddenMethods, OverriddenMethods[] from CXXMethodDecl.
2021   //
2022   //  Add an AbbrevOp for 'size then elements' and use it here.
2023   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2024   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
2025   DeclCXXMethodAbbrev = Stream.EmitAbbrev(Abv);
2026 
2027   // Abbreviation for EXPR_DECL_REF
2028   Abv = new BitCodeAbbrev();
2029   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_DECL_REF));
2030   //Stmt
2031   //Expr
2032   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2033   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2034   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2035   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2036   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2037   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2038   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2039   //DeclRefExpr
2040   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HasQualifier
2041   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //GetDeclFound
2042   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ExplicitTemplateArgs
2043   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HadMultipleCandidates
2044   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
2045                            1)); // RefersToEnclosingVariableOrCapture
2046   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclRef
2047   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
2048   DeclRefExprAbbrev = Stream.EmitAbbrev(Abv);
2049 
2050   // Abbreviation for EXPR_INTEGER_LITERAL
2051   Abv = new BitCodeAbbrev();
2052   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_INTEGER_LITERAL));
2053   //Stmt
2054   //Expr
2055   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2056   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2057   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2058   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2059   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2060   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2061   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2062   //Integer Literal
2063   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
2064   Abv->Add(BitCodeAbbrevOp(32));                      // Bit Width
2065   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Value
2066   IntegerLiteralAbbrev = Stream.EmitAbbrev(Abv);
2067 
2068   // Abbreviation for EXPR_CHARACTER_LITERAL
2069   Abv = new BitCodeAbbrev();
2070   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_CHARACTER_LITERAL));
2071   //Stmt
2072   //Expr
2073   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2074   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2075   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2076   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2077   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2078   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2079   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2080   //Character Literal
2081   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getValue
2082   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
2083   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // getKind
2084   CharacterLiteralAbbrev = Stream.EmitAbbrev(Abv);
2085 
2086   // Abbreviation for EXPR_IMPLICIT_CAST
2087   Abv = new BitCodeAbbrev();
2088   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_IMPLICIT_CAST));
2089   // Stmt
2090   // Expr
2091   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2092   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2093   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2094   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2095   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2096   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2097   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2098   // CastExpr
2099   Abv->Add(BitCodeAbbrevOp(0)); // PathSize
2100   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 6)); // CastKind
2101   // ImplicitCastExpr
2102   ExprImplicitCastAbbrev = Stream.EmitAbbrev(Abv);
2103 
2104   Abv = new BitCodeAbbrev();
2105   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_LEXICAL));
2106   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2107   DeclContextLexicalAbbrev = Stream.EmitAbbrev(Abv);
2108 
2109   Abv = new BitCodeAbbrev();
2110   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_VISIBLE));
2111   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2112   DeclContextVisibleLookupAbbrev = Stream.EmitAbbrev(Abv);
2113 }
2114 
2115 /// isRequiredDecl - Check if this is a "required" Decl, which must be seen by
2116 /// consumers of the AST.
2117 ///
2118 /// Such decls will always be deserialized from the AST file, so we would like
2119 /// this to be as restrictive as possible. Currently the predicate is driven by
2120 /// code generation requirements, if other clients have a different notion of
2121 /// what is "required" then we may have to consider an alternate scheme where
2122 /// clients can iterate over the top-level decls and get information on them,
2123 /// without necessary deserializing them. We could explicitly require such
2124 /// clients to use a separate API call to "realize" the decl. This should be
2125 /// relatively painless since they would presumably only do it for top-level
2126 /// decls.
2127 static bool isRequiredDecl(const Decl *D, ASTContext &Context,
2128                            bool WritingModule) {
2129   // An ObjCMethodDecl is never considered as "required" because its
2130   // implementation container always is.
2131 
2132   // File scoped assembly or obj-c implementation must be seen.
2133   if (isa<FileScopeAsmDecl>(D) || isa<ObjCImplDecl>(D))
2134     return true;
2135 
2136   // ImportDecl is used by codegen to determine the set of imported modules to
2137   // search for inputs for automatic linking; include it if it has a semantic
2138   // effect.
2139   if (isa<ImportDecl>(D) && !WritingModule)
2140     return true;
2141 
2142   return Context.DeclMustBeEmitted(D);
2143 }
2144 
2145 void ASTWriter::WriteDecl(ASTContext &Context, Decl *D) {
2146   // Switch case IDs are per Decl.
2147   ClearSwitchCaseIDs();
2148 
2149   RecordData Record;
2150   ASTDeclWriter W(*this, Context, Record);
2151 
2152   // Determine the ID for this declaration.
2153   serialization::DeclID ID;
2154   assert(!D->isFromASTFile() && "should not be emitting imported decl");
2155   serialization::DeclID &IDR = DeclIDs[D];
2156   if (IDR == 0)
2157     IDR = NextDeclID++;
2158 
2159   ID = IDR;
2160 
2161   assert(ID >= FirstDeclID && "invalid decl ID");
2162 
2163   // If this declaration is also a DeclContext, write blocks for the
2164   // declarations that lexically stored inside its context and those
2165   // declarations that are visible from its context. These blocks
2166   // are written before the declaration itself so that we can put
2167   // their offsets into the record for the declaration.
2168   uint64_t LexicalOffset = 0;
2169   uint64_t VisibleOffset = 0;
2170   DeclContext *DC = dyn_cast<DeclContext>(D);
2171   if (DC) {
2172     LexicalOffset = WriteDeclContextLexicalBlock(Context, DC);
2173     VisibleOffset = WriteDeclContextVisibleBlock(Context, DC);
2174   }
2175 
2176   // Build a record for this declaration
2177   Record.clear();
2178   W.Code = (serialization::DeclCode)0;
2179   W.AbbrevToUse = 0;
2180   W.Visit(D);
2181   if (DC) W.VisitDeclContext(DC, LexicalOffset, VisibleOffset);
2182 
2183   unsigned Index = ID - FirstDeclID;
2184 
2185   // Record the offset for this declaration
2186   SourceLocation Loc = D->getLocation();
2187   if (DeclOffsets.size() == Index)
2188     DeclOffsets.push_back(DeclOffset(Loc, Stream.GetCurrentBitNo()));
2189   else if (DeclOffsets.size() < Index) {
2190     DeclOffsets.resize(Index+1);
2191     DeclOffsets[Index].setLocation(Loc);
2192     DeclOffsets[Index].BitOffset = Stream.GetCurrentBitNo();
2193   }
2194 
2195   SourceManager &SM = Context.getSourceManager();
2196   if (Loc.isValid() && SM.isLocalSourceLocation(Loc))
2197     associateDeclWithFile(D, ID);
2198 
2199   if (!W.Code)
2200     llvm::report_fatal_error(StringRef("unexpected declaration kind '") +
2201                             D->getDeclKindName() + "'");
2202   Stream.EmitRecord(W.Code, Record, W.AbbrevToUse);
2203 
2204   // Flush any expressions, base specifiers, and ctor initializers that
2205   // were written as part of this declaration.
2206   FlushPendingAfterDecl();
2207 
2208   // Note declarations that should be deserialized eagerly so that we can add
2209   // them to a record in the AST file later.
2210   if (isRequiredDecl(D, Context, WritingModule))
2211     EagerlyDeserializedDecls.push_back(ID);
2212 }
2213 
2214 void ASTWriter::AddFunctionDefinition(const FunctionDecl *FD,
2215                                       RecordData &Record) {
2216   ClearSwitchCaseIDs();
2217 
2218   ASTDeclWriter W(*this, FD->getASTContext(), Record);
2219   W.AddFunctionDefinition(FD);
2220 }
2221