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 
ASTDeclWriter(ASTWriter & Writer,ASTContext & Context,RecordData & Record)45     ASTDeclWriter(ASTWriter &Writer, ASTContext &Context, RecordData &Record)
46       : Writer(Writer), Context(Context), Record(Record) {
47     }
48 
49     void Visit(Decl *D);
50 
51     void VisitDecl(Decl *D);
52     void VisitTranslationUnitDecl(TranslationUnitDecl *D);
53     void VisitNamedDecl(NamedDecl *D);
54     void VisitLabelDecl(LabelDecl *LD);
55     void VisitNamespaceDecl(NamespaceDecl *D);
56     void VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
57     void VisitNamespaceAliasDecl(NamespaceAliasDecl *D);
58     void VisitTypeDecl(TypeDecl *D);
59     void VisitTypedefNameDecl(TypedefNameDecl *D);
60     void VisitTypedefDecl(TypedefDecl *D);
61     void VisitTypeAliasDecl(TypeAliasDecl *D);
62     void VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
63     void VisitTagDecl(TagDecl *D);
64     void VisitEnumDecl(EnumDecl *D);
65     void VisitRecordDecl(RecordDecl *D);
66     void VisitCXXRecordDecl(CXXRecordDecl *D);
67     void VisitClassTemplateSpecializationDecl(
68                                             ClassTemplateSpecializationDecl *D);
69     void VisitClassTemplatePartialSpecializationDecl(
70                                      ClassTemplatePartialSpecializationDecl *D);
71     void VisitVarTemplateSpecializationDecl(VarTemplateSpecializationDecl *D);
72     void VisitVarTemplatePartialSpecializationDecl(
73         VarTemplatePartialSpecializationDecl *D);
74     void VisitClassScopeFunctionSpecializationDecl(
75                                        ClassScopeFunctionSpecializationDecl *D);
76     void VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D);
77     void VisitValueDecl(ValueDecl *D);
78     void VisitEnumConstantDecl(EnumConstantDecl *D);
79     void VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
80     void VisitDeclaratorDecl(DeclaratorDecl *D);
81     void VisitFunctionDecl(FunctionDecl *D);
82     void VisitCXXMethodDecl(CXXMethodDecl *D);
83     void VisitCXXConstructorDecl(CXXConstructorDecl *D);
84     void VisitCXXDestructorDecl(CXXDestructorDecl *D);
85     void VisitCXXConversionDecl(CXXConversionDecl *D);
86     void VisitFieldDecl(FieldDecl *D);
87     void VisitMSPropertyDecl(MSPropertyDecl *D);
88     void VisitIndirectFieldDecl(IndirectFieldDecl *D);
89     void VisitVarDecl(VarDecl *D);
90     void VisitImplicitParamDecl(ImplicitParamDecl *D);
91     void VisitParmVarDecl(ParmVarDecl *D);
92     void VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D);
93     void VisitTemplateDecl(TemplateDecl *D);
94     void VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D);
95     void VisitClassTemplateDecl(ClassTemplateDecl *D);
96     void VisitVarTemplateDecl(VarTemplateDecl *D);
97     void VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
98     void VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D);
99     void VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D);
100     void VisitUsingDecl(UsingDecl *D);
101     void VisitUsingShadowDecl(UsingShadowDecl *D);
102     void VisitLinkageSpecDecl(LinkageSpecDecl *D);
103     void VisitFileScopeAsmDecl(FileScopeAsmDecl *D);
104     void VisitImportDecl(ImportDecl *D);
105     void VisitAccessSpecDecl(AccessSpecDecl *D);
106     void VisitFriendDecl(FriendDecl *D);
107     void VisitFriendTemplateDecl(FriendTemplateDecl *D);
108     void VisitStaticAssertDecl(StaticAssertDecl *D);
109     void VisitBlockDecl(BlockDecl *D);
110     void VisitCapturedDecl(CapturedDecl *D);
111     void VisitEmptyDecl(EmptyDecl *D);
112 
113     void VisitDeclContext(DeclContext *DC, uint64_t LexicalOffset,
114                           uint64_t VisibleOffset);
115     template <typename T> void VisitRedeclarable(Redeclarable<T> *D);
116 
117 
118     // FIXME: Put in the same order is DeclNodes.td?
119     void VisitObjCMethodDecl(ObjCMethodDecl *D);
120     void VisitObjCTypeParamDecl(ObjCTypeParamDecl *D);
121     void VisitObjCContainerDecl(ObjCContainerDecl *D);
122     void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
123     void VisitObjCIvarDecl(ObjCIvarDecl *D);
124     void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
125     void VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D);
126     void VisitObjCCategoryDecl(ObjCCategoryDecl *D);
127     void VisitObjCImplDecl(ObjCImplDecl *D);
128     void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
129     void VisitObjCImplementationDecl(ObjCImplementationDecl *D);
130     void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D);
131     void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
132     void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
133     void VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D);
134 
135     /// Add an Objective-C type parameter list to the given record.
AddObjCTypeParamList(ObjCTypeParamList * typeParams)136     void AddObjCTypeParamList(ObjCTypeParamList *typeParams) {
137       // Empty type parameter list.
138       if (!typeParams) {
139         Record.push_back(0);
140         return;
141       }
142 
143       Record.push_back(typeParams->size());
144       for (auto typeParam : *typeParams) {
145         Writer.AddDeclRef(typeParam, Record);
146       }
147       Writer.AddSourceLocation(typeParams->getLAngleLoc(), Record);
148       Writer.AddSourceLocation(typeParams->getRAngleLoc(), Record);
149     }
150 
AddFunctionDefinition(const FunctionDecl * FD)151     void AddFunctionDefinition(const FunctionDecl *FD) {
152       assert(FD->doesThisDeclarationHaveABody());
153       if (auto *CD = dyn_cast<CXXConstructorDecl>(FD)) {
154         Record.push_back(CD->NumCtorInitializers);
155         if (CD->NumCtorInitializers)
156           Writer.AddCXXCtorInitializersRef(
157               llvm::makeArrayRef(CD->init_begin(), CD->init_end()), Record);
158       }
159       Writer.AddStmt(FD->getBody());
160     }
161 
162     /// Add to the record the first declaration from each module file that
163     /// provides a declaration of D. The intent is to provide a sufficient
164     /// set such that reloading this set will load all current redeclarations.
AddFirstDeclFromEachModule(const Decl * D,bool IncludeLocal)165     void AddFirstDeclFromEachModule(const Decl *D, bool IncludeLocal) {
166       llvm::MapVector<ModuleFile*, const Decl*> Firsts;
167       // FIXME: We can skip entries that we know are implied by others.
168       for (const Decl *R = D->getMostRecentDecl(); R; R = R->getPreviousDecl()) {
169         if (R->isFromASTFile())
170           Firsts[Writer.Chain->getOwningModuleFile(R)] = R;
171         else if (IncludeLocal)
172           Firsts[nullptr] = R;
173       }
174       for (const auto &F : Firsts)
175         Writer.AddDeclRef(F.second, Record);
176     }
177 
178     /// Get the specialization decl from an entry in the specialization list.
179     template <typename EntryType>
180     typename RedeclarableTemplateDecl::SpecEntryTraits<EntryType>::DeclType *
getSpecializationDecl(EntryType & T)181     getSpecializationDecl(EntryType &T) {
182       return RedeclarableTemplateDecl::SpecEntryTraits<EntryType>::getDecl(&T);
183     }
184 
185     /// Get the list of partial specializations from a template's common ptr.
186     template<typename T>
getPartialSpecializations(T * Common)187     decltype(T::PartialSpecializations) &getPartialSpecializations(T *Common) {
188       return Common->PartialSpecializations;
189     }
getPartialSpecializations(FunctionTemplateDecl::Common *)190     ArrayRef<Decl> getPartialSpecializations(FunctionTemplateDecl::Common *) {
191       return None;
192     }
193 
194     template<typename Decl>
AddTemplateSpecializations(Decl * D)195     void AddTemplateSpecializations(Decl *D) {
196       auto *Common = D->getCommonPtr();
197 
198       // If we have any lazy specializations, and the external AST source is
199       // our chained AST reader, we can just write out the DeclIDs. Otherwise,
200       // we need to resolve them to actual declarations.
201       if (Writer.Chain != Writer.Context->getExternalSource() &&
202           Common->LazySpecializations) {
203         D->LoadLazySpecializations();
204         assert(!Common->LazySpecializations);
205       }
206 
207       auto &Specializations = Common->Specializations;
208       auto &&PartialSpecializations = getPartialSpecializations(Common);
209       ArrayRef<DeclID> LazySpecializations;
210       if (auto *LS = Common->LazySpecializations)
211         LazySpecializations = llvm::makeArrayRef(LS + 1, LS[0]);
212 
213       // Add a slot to the record for the number of specializations.
214       unsigned I = Record.size();
215       Record.push_back(0);
216 
217       for (auto &Entry : Specializations) {
218         auto *D = getSpecializationDecl(Entry);
219         assert(D->isCanonicalDecl() && "non-canonical decl in set");
220         AddFirstDeclFromEachModule(D, /*IncludeLocal*/true);
221       }
222       for (auto &Entry : PartialSpecializations) {
223         auto *D = getSpecializationDecl(Entry);
224         assert(D->isCanonicalDecl() && "non-canonical decl in set");
225         AddFirstDeclFromEachModule(D, /*IncludeLocal*/true);
226       }
227       Record.append(LazySpecializations.begin(), LazySpecializations.end());
228 
229       // Update the size entry we added earlier.
230       Record[I] = Record.size() - I - 1;
231     }
232 
233     /// Ensure that this template specialization is associated with the specified
234     /// template on reload.
RegisterTemplateSpecialization(const Decl * Template,const Decl * Specialization)235     void RegisterTemplateSpecialization(const Decl *Template,
236                                         const Decl *Specialization) {
237       Template = Template->getCanonicalDecl();
238 
239       // If the canonical template is local, we'll write out this specialization
240       // when we emit it.
241       // FIXME: We can do the same thing if there is any local declaration of
242       // the template, to avoid emitting an update record.
243       if (!Template->isFromASTFile())
244         return;
245 
246       // We only need to associate the first local declaration of the
247       // specialization. The other declarations will get pulled in by it.
248       if (Writer.getFirstLocalDecl(Specialization) != Specialization)
249         return;
250 
251       Writer.DeclUpdates[Template].push_back(ASTWriter::DeclUpdate(
252           UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION, Specialization));
253     }
254   };
255 }
256 
Visit(Decl * D)257 void ASTDeclWriter::Visit(Decl *D) {
258   DeclVisitor<ASTDeclWriter>::Visit(D);
259 
260   // Source locations require array (variable-length) abbreviations.  The
261   // abbreviation infrastructure requires that arrays are encoded last, so
262   // we handle it here in the case of those classes derived from DeclaratorDecl
263   if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)) {
264     Writer.AddTypeSourceInfo(DD->getTypeSourceInfo(), Record);
265   }
266 
267   // Handle FunctionDecl's body here and write it after all other Stmts/Exprs
268   // have been written. We want it last because we will not read it back when
269   // retrieving it from the AST, we'll just lazily set the offset.
270   if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
271     Record.push_back(FD->doesThisDeclarationHaveABody());
272     if (FD->doesThisDeclarationHaveABody())
273       AddFunctionDefinition(FD);
274   }
275 }
276 
VisitDecl(Decl * D)277 void ASTDeclWriter::VisitDecl(Decl *D) {
278   Writer.AddDeclRef(cast_or_null<Decl>(D->getDeclContext()), Record);
279   if (D->getDeclContext() != D->getLexicalDeclContext())
280     Writer.AddDeclRef(cast_or_null<Decl>(D->getLexicalDeclContext()), Record);
281   else
282     Record.push_back(0);
283   Record.push_back(D->isInvalidDecl());
284   Record.push_back(D->hasAttrs());
285   if (D->hasAttrs())
286     Writer.WriteAttributes(llvm::makeArrayRef(D->getAttrs().begin(),
287                                               D->getAttrs().size()), Record);
288   Record.push_back(D->isImplicit());
289   Record.push_back(D->isUsed(false));
290   Record.push_back(D->isReferenced());
291   Record.push_back(D->isTopLevelDeclInObjCContainer());
292   Record.push_back(D->getAccess());
293   Record.push_back(D->isModulePrivate());
294   Record.push_back(Writer.inferSubmoduleIDFromLocation(D->getLocation()));
295 
296   // If this declaration injected a name into a context different from its
297   // lexical context, and that context is an imported namespace, we need to
298   // update its visible declarations to include this name.
299   //
300   // This happens when we instantiate a class with a friend declaration or a
301   // function with a local extern declaration, for instance.
302   //
303   // FIXME: Can we handle this in AddedVisibleDecl instead?
304   if (D->isOutOfLine()) {
305     auto *DC = D->getDeclContext();
306     while (auto *NS = dyn_cast<NamespaceDecl>(DC->getRedeclContext())) {
307       if (!NS->isFromASTFile())
308         break;
309       Writer.UpdatedDeclContexts.insert(NS->getPrimaryContext());
310       if (!NS->isInlineNamespace())
311         break;
312       DC = NS->getParent();
313     }
314   }
315 }
316 
VisitTranslationUnitDecl(TranslationUnitDecl * D)317 void ASTDeclWriter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
318   llvm_unreachable("Translation units aren't directly serialized");
319 }
320 
VisitNamedDecl(NamedDecl * D)321 void ASTDeclWriter::VisitNamedDecl(NamedDecl *D) {
322   VisitDecl(D);
323   Writer.AddDeclarationName(D->getDeclName(), Record);
324   Record.push_back(needsAnonymousDeclarationNumber(D)
325                        ? Writer.getAnonymousDeclarationNumber(D)
326                        : 0);
327 }
328 
VisitTypeDecl(TypeDecl * D)329 void ASTDeclWriter::VisitTypeDecl(TypeDecl *D) {
330   VisitNamedDecl(D);
331   Writer.AddSourceLocation(D->getLocStart(), Record);
332   Writer.AddTypeRef(QualType(D->getTypeForDecl(), 0), Record);
333 }
334 
VisitTypedefNameDecl(TypedefNameDecl * D)335 void ASTDeclWriter::VisitTypedefNameDecl(TypedefNameDecl *D) {
336   VisitRedeclarable(D);
337   VisitTypeDecl(D);
338   Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record);
339   Record.push_back(D->isModed());
340   if (D->isModed())
341     Writer.AddTypeRef(D->getUnderlyingType(), Record);
342 }
343 
VisitTypedefDecl(TypedefDecl * D)344 void ASTDeclWriter::VisitTypedefDecl(TypedefDecl *D) {
345   VisitTypedefNameDecl(D);
346   if (D->getDeclContext() == D->getLexicalDeclContext() &&
347       !D->hasAttrs() &&
348       !D->isImplicit() &&
349       D->getFirstDecl() == D->getMostRecentDecl() &&
350       !D->isInvalidDecl() &&
351       !D->isTopLevelDeclInObjCContainer() &&
352       !D->isModulePrivate() &&
353       !needsAnonymousDeclarationNumber(D) &&
354       D->getDeclName().getNameKind() == DeclarationName::Identifier)
355     AbbrevToUse = Writer.getDeclTypedefAbbrev();
356 
357   Code = serialization::DECL_TYPEDEF;
358 }
359 
VisitTypeAliasDecl(TypeAliasDecl * D)360 void ASTDeclWriter::VisitTypeAliasDecl(TypeAliasDecl *D) {
361   VisitTypedefNameDecl(D);
362   Writer.AddDeclRef(D->getDescribedAliasTemplate(), Record);
363   Code = serialization::DECL_TYPEALIAS;
364 }
365 
VisitTagDecl(TagDecl * D)366 void ASTDeclWriter::VisitTagDecl(TagDecl *D) {
367   VisitRedeclarable(D);
368   VisitTypeDecl(D);
369   Record.push_back(D->getIdentifierNamespace());
370   Record.push_back((unsigned)D->getTagKind()); // FIXME: stable encoding
371   if (!isa<CXXRecordDecl>(D))
372     Record.push_back(D->isCompleteDefinition());
373   Record.push_back(D->isEmbeddedInDeclarator());
374   Record.push_back(D->isFreeStanding());
375   Record.push_back(D->isCompleteDefinitionRequired());
376   Writer.AddSourceLocation(D->getRBraceLoc(), Record);
377 
378   if (D->hasExtInfo()) {
379     Record.push_back(1);
380     Writer.AddQualifierInfo(*D->getExtInfo(), Record);
381   } else if (auto *TD = D->getTypedefNameForAnonDecl()) {
382     Record.push_back(2);
383     Writer.AddDeclRef(TD, Record);
384     Writer.AddIdentifierRef(TD->getDeclName().getAsIdentifierInfo(), Record);
385   } else {
386     Record.push_back(0);
387   }
388 }
389 
VisitEnumDecl(EnumDecl * D)390 void ASTDeclWriter::VisitEnumDecl(EnumDecl *D) {
391   VisitTagDecl(D);
392   Writer.AddTypeSourceInfo(D->getIntegerTypeSourceInfo(), Record);
393   if (!D->getIntegerTypeSourceInfo())
394     Writer.AddTypeRef(D->getIntegerType(), Record);
395   Writer.AddTypeRef(D->getPromotionType(), Record);
396   Record.push_back(D->getNumPositiveBits());
397   Record.push_back(D->getNumNegativeBits());
398   Record.push_back(D->isScoped());
399   Record.push_back(D->isScopedUsingClassTag());
400   Record.push_back(D->isFixed());
401   if (MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo()) {
402     Writer.AddDeclRef(MemberInfo->getInstantiatedFrom(), Record);
403     Record.push_back(MemberInfo->getTemplateSpecializationKind());
404     Writer.AddSourceLocation(MemberInfo->getPointOfInstantiation(), Record);
405   } else {
406     Writer.AddDeclRef(nullptr, Record);
407   }
408 
409   if (D->getDeclContext() == D->getLexicalDeclContext() &&
410       !D->hasAttrs() &&
411       !D->isImplicit() &&
412       !D->isUsed(false) &&
413       !D->hasExtInfo() &&
414       !D->getTypedefNameForAnonDecl() &&
415       D->getFirstDecl() == D->getMostRecentDecl() &&
416       !D->isInvalidDecl() &&
417       !D->isReferenced() &&
418       !D->isTopLevelDeclInObjCContainer() &&
419       D->getAccess() == AS_none &&
420       !D->isModulePrivate() &&
421       !CXXRecordDecl::classofKind(D->getKind()) &&
422       !D->getIntegerTypeSourceInfo() &&
423       !D->getMemberSpecializationInfo() &&
424       !needsAnonymousDeclarationNumber(D) &&
425       D->getDeclName().getNameKind() == DeclarationName::Identifier)
426     AbbrevToUse = Writer.getDeclEnumAbbrev();
427 
428   Code = serialization::DECL_ENUM;
429 }
430 
VisitRecordDecl(RecordDecl * D)431 void ASTDeclWriter::VisitRecordDecl(RecordDecl *D) {
432   VisitTagDecl(D);
433   Record.push_back(D->hasFlexibleArrayMember());
434   Record.push_back(D->isAnonymousStructOrUnion());
435   Record.push_back(D->hasObjectMember());
436   Record.push_back(D->hasVolatileMember());
437 
438   if (D->getDeclContext() == D->getLexicalDeclContext() &&
439       !D->hasAttrs() &&
440       !D->isImplicit() &&
441       !D->isUsed(false) &&
442       !D->hasExtInfo() &&
443       !D->getTypedefNameForAnonDecl() &&
444       D->getFirstDecl() == D->getMostRecentDecl() &&
445       !D->isInvalidDecl() &&
446       !D->isReferenced() &&
447       !D->isTopLevelDeclInObjCContainer() &&
448       D->getAccess() == AS_none &&
449       !D->isModulePrivate() &&
450       !CXXRecordDecl::classofKind(D->getKind()) &&
451       !needsAnonymousDeclarationNumber(D) &&
452       D->getDeclName().getNameKind() == DeclarationName::Identifier)
453     AbbrevToUse = Writer.getDeclRecordAbbrev();
454 
455   Code = serialization::DECL_RECORD;
456 }
457 
VisitValueDecl(ValueDecl * D)458 void ASTDeclWriter::VisitValueDecl(ValueDecl *D) {
459   VisitNamedDecl(D);
460   Writer.AddTypeRef(D->getType(), Record);
461 }
462 
VisitEnumConstantDecl(EnumConstantDecl * D)463 void ASTDeclWriter::VisitEnumConstantDecl(EnumConstantDecl *D) {
464   VisitValueDecl(D);
465   Record.push_back(D->getInitExpr()? 1 : 0);
466   if (D->getInitExpr())
467     Writer.AddStmt(D->getInitExpr());
468   Writer.AddAPSInt(D->getInitVal(), Record);
469 
470   Code = serialization::DECL_ENUM_CONSTANT;
471 }
472 
VisitDeclaratorDecl(DeclaratorDecl * D)473 void ASTDeclWriter::VisitDeclaratorDecl(DeclaratorDecl *D) {
474   VisitValueDecl(D);
475   Writer.AddSourceLocation(D->getInnerLocStart(), Record);
476   Record.push_back(D->hasExtInfo());
477   if (D->hasExtInfo())
478     Writer.AddQualifierInfo(*D->getExtInfo(), Record);
479 }
480 
VisitFunctionDecl(FunctionDecl * D)481 void ASTDeclWriter::VisitFunctionDecl(FunctionDecl *D) {
482   VisitRedeclarable(D);
483   VisitDeclaratorDecl(D);
484   Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
485   Record.push_back(D->getIdentifierNamespace());
486 
487   // FunctionDecl's body is handled last at ASTWriterDecl::Visit,
488   // after everything else is written.
489 
490   Record.push_back((int)D->SClass); // FIXME: stable encoding
491   Record.push_back(D->IsInline);
492   Record.push_back(D->IsInlineSpecified);
493   Record.push_back(D->IsVirtualAsWritten);
494   Record.push_back(D->IsPure);
495   Record.push_back(D->HasInheritedPrototype);
496   Record.push_back(D->HasWrittenPrototype);
497   Record.push_back(D->IsDeleted);
498   Record.push_back(D->IsTrivial);
499   Record.push_back(D->IsDefaulted);
500   Record.push_back(D->IsExplicitlyDefaulted);
501   Record.push_back(D->HasImplicitReturnZero);
502   Record.push_back(D->IsConstexpr);
503   Record.push_back(D->HasSkippedBody);
504   Record.push_back(D->IsLateTemplateParsed);
505   Record.push_back(D->getLinkageInternal());
506   Writer.AddSourceLocation(D->getLocEnd(), Record);
507 
508   Record.push_back(D->getTemplatedKind());
509   switch (D->getTemplatedKind()) {
510   case FunctionDecl::TK_NonTemplate:
511     break;
512   case FunctionDecl::TK_FunctionTemplate:
513     Writer.AddDeclRef(D->getDescribedFunctionTemplate(), Record);
514     break;
515   case FunctionDecl::TK_MemberSpecialization: {
516     MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo();
517     Writer.AddDeclRef(MemberInfo->getInstantiatedFrom(), Record);
518     Record.push_back(MemberInfo->getTemplateSpecializationKind());
519     Writer.AddSourceLocation(MemberInfo->getPointOfInstantiation(), Record);
520     break;
521   }
522   case FunctionDecl::TK_FunctionTemplateSpecialization: {
523     FunctionTemplateSpecializationInfo *
524       FTSInfo = D->getTemplateSpecializationInfo();
525 
526     RegisterTemplateSpecialization(FTSInfo->getTemplate(), D);
527 
528     Writer.AddDeclRef(FTSInfo->getTemplate(), Record);
529     Record.push_back(FTSInfo->getTemplateSpecializationKind());
530 
531     // Template arguments.
532     Writer.AddTemplateArgumentList(FTSInfo->TemplateArguments, Record);
533 
534     // Template args as written.
535     Record.push_back(FTSInfo->TemplateArgumentsAsWritten != nullptr);
536     if (FTSInfo->TemplateArgumentsAsWritten) {
537       Record.push_back(FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs);
538       for (int i=0, e = FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs;
539              i!=e; ++i)
540         Writer.AddTemplateArgumentLoc((*FTSInfo->TemplateArgumentsAsWritten)[i],
541                                       Record);
542       Writer.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->LAngleLoc,
543                                Record);
544       Writer.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->RAngleLoc,
545                                Record);
546     }
547 
548     Writer.AddSourceLocation(FTSInfo->getPointOfInstantiation(), Record);
549 
550     if (D->isCanonicalDecl()) {
551       // Write the template that contains the specializations set. We will
552       // add a FunctionTemplateSpecializationInfo to it when reading.
553       Writer.AddDeclRef(FTSInfo->getTemplate()->getCanonicalDecl(), Record);
554     }
555     break;
556   }
557   case FunctionDecl::TK_DependentFunctionTemplateSpecialization: {
558     DependentFunctionTemplateSpecializationInfo *
559       DFTSInfo = D->getDependentSpecializationInfo();
560 
561     // Templates.
562     Record.push_back(DFTSInfo->getNumTemplates());
563     for (int i=0, e = DFTSInfo->getNumTemplates(); i != e; ++i)
564       Writer.AddDeclRef(DFTSInfo->getTemplate(i), Record);
565 
566     // Templates args.
567     Record.push_back(DFTSInfo->getNumTemplateArgs());
568     for (int i=0, e = DFTSInfo->getNumTemplateArgs(); i != e; ++i)
569       Writer.AddTemplateArgumentLoc(DFTSInfo->getTemplateArg(i), Record);
570     Writer.AddSourceLocation(DFTSInfo->getLAngleLoc(), Record);
571     Writer.AddSourceLocation(DFTSInfo->getRAngleLoc(), Record);
572     break;
573   }
574   }
575 
576   Record.push_back(D->param_size());
577   for (auto P : D->params())
578     Writer.AddDeclRef(P, Record);
579   Code = serialization::DECL_FUNCTION;
580 }
581 
VisitObjCMethodDecl(ObjCMethodDecl * D)582 void ASTDeclWriter::VisitObjCMethodDecl(ObjCMethodDecl *D) {
583   VisitNamedDecl(D);
584   // FIXME: convert to LazyStmtPtr?
585   // Unlike C/C++, method bodies will never be in header files.
586   bool HasBodyStuff = D->getBody() != nullptr     ||
587                       D->getSelfDecl() != nullptr || D->getCmdDecl() != nullptr;
588   Record.push_back(HasBodyStuff);
589   if (HasBodyStuff) {
590     Writer.AddStmt(D->getBody());
591     Writer.AddDeclRef(D->getSelfDecl(), Record);
592     Writer.AddDeclRef(D->getCmdDecl(), Record);
593   }
594   Record.push_back(D->isInstanceMethod());
595   Record.push_back(D->isVariadic());
596   Record.push_back(D->isPropertyAccessor());
597   Record.push_back(D->isDefined());
598   Record.push_back(D->IsOverriding);
599   Record.push_back(D->HasSkippedBody);
600 
601   Record.push_back(D->IsRedeclaration);
602   Record.push_back(D->HasRedeclaration);
603   if (D->HasRedeclaration) {
604     assert(Context.getObjCMethodRedeclaration(D));
605     Writer.AddDeclRef(Context.getObjCMethodRedeclaration(D), Record);
606   }
607 
608   // FIXME: stable encoding for @required/@optional
609   Record.push_back(D->getImplementationControl());
610   // FIXME: stable encoding for in/out/inout/bycopy/byref/oneway/nullability
611   Record.push_back(D->getObjCDeclQualifier());
612   Record.push_back(D->hasRelatedResultType());
613   Writer.AddTypeRef(D->getReturnType(), Record);
614   Writer.AddTypeSourceInfo(D->getReturnTypeSourceInfo(), Record);
615   Writer.AddSourceLocation(D->getLocEnd(), Record);
616   Record.push_back(D->param_size());
617   for (const auto *P : D->params())
618     Writer.AddDeclRef(P, Record);
619 
620   Record.push_back(D->SelLocsKind);
621   unsigned NumStoredSelLocs = D->getNumStoredSelLocs();
622   SourceLocation *SelLocs = D->getStoredSelLocs();
623   Record.push_back(NumStoredSelLocs);
624   for (unsigned i = 0; i != NumStoredSelLocs; ++i)
625     Writer.AddSourceLocation(SelLocs[i], Record);
626 
627   Code = serialization::DECL_OBJC_METHOD;
628 }
629 
VisitObjCTypeParamDecl(ObjCTypeParamDecl * D)630 void ASTDeclWriter::VisitObjCTypeParamDecl(ObjCTypeParamDecl *D) {
631   VisitTypedefNameDecl(D);
632   Record.push_back(D->Variance);
633   Record.push_back(D->Index);
634   Writer.AddSourceLocation(D->VarianceLoc, Record);
635   Writer.AddSourceLocation(D->ColonLoc, Record);
636 
637   Code = serialization::DECL_OBJC_TYPE_PARAM;
638 }
639 
VisitObjCContainerDecl(ObjCContainerDecl * D)640 void ASTDeclWriter::VisitObjCContainerDecl(ObjCContainerDecl *D) {
641   VisitNamedDecl(D);
642   Writer.AddSourceLocation(D->getAtStartLoc(), Record);
643   Writer.AddSourceRange(D->getAtEndRange(), Record);
644   // Abstract class (no need to define a stable serialization::DECL code).
645 }
646 
VisitObjCInterfaceDecl(ObjCInterfaceDecl * D)647 void ASTDeclWriter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *D) {
648   VisitRedeclarable(D);
649   VisitObjCContainerDecl(D);
650   Writer.AddTypeRef(QualType(D->getTypeForDecl(), 0), Record);
651   AddObjCTypeParamList(D->TypeParamList);
652 
653   Record.push_back(D->isThisDeclarationADefinition());
654   if (D->isThisDeclarationADefinition()) {
655     // Write the DefinitionData
656     ObjCInterfaceDecl::DefinitionData &Data = D->data();
657 
658     Writer.AddTypeSourceInfo(D->getSuperClassTInfo(), Record);
659     Writer.AddSourceLocation(D->getEndOfDefinitionLoc(), Record);
660     Record.push_back(Data.HasDesignatedInitializers);
661 
662     // Write out the protocols that are directly referenced by the @interface.
663     Record.push_back(Data.ReferencedProtocols.size());
664     for (const auto *P : D->protocols())
665       Writer.AddDeclRef(P, Record);
666     for (const auto &PL : D->protocol_locs())
667       Writer.AddSourceLocation(PL, Record);
668 
669     // Write out the protocols that are transitively referenced.
670     Record.push_back(Data.AllReferencedProtocols.size());
671     for (ObjCList<ObjCProtocolDecl>::iterator
672               P = Data.AllReferencedProtocols.begin(),
673            PEnd = Data.AllReferencedProtocols.end();
674          P != PEnd; ++P)
675       Writer.AddDeclRef(*P, Record);
676 
677 
678     if (ObjCCategoryDecl *Cat = D->getCategoryListRaw()) {
679       // Ensure that we write out the set of categories for this class.
680       Writer.ObjCClassesWithCategories.insert(D);
681 
682       // Make sure that the categories get serialized.
683       for (; Cat; Cat = Cat->getNextClassCategoryRaw())
684         (void)Writer.GetDeclRef(Cat);
685     }
686   }
687 
688   Code = serialization::DECL_OBJC_INTERFACE;
689 }
690 
VisitObjCIvarDecl(ObjCIvarDecl * D)691 void ASTDeclWriter::VisitObjCIvarDecl(ObjCIvarDecl *D) {
692   VisitFieldDecl(D);
693   // FIXME: stable encoding for @public/@private/@protected/@package
694   Record.push_back(D->getAccessControl());
695   Record.push_back(D->getSynthesize());
696 
697   if (D->getDeclContext() == D->getLexicalDeclContext() &&
698       !D->hasAttrs() &&
699       !D->isImplicit() &&
700       !D->isUsed(false) &&
701       !D->isInvalidDecl() &&
702       !D->isReferenced() &&
703       !D->isModulePrivate() &&
704       !D->getBitWidth() &&
705       !D->hasExtInfo() &&
706       D->getDeclName())
707     AbbrevToUse = Writer.getDeclObjCIvarAbbrev();
708 
709   Code = serialization::DECL_OBJC_IVAR;
710 }
711 
VisitObjCProtocolDecl(ObjCProtocolDecl * D)712 void ASTDeclWriter::VisitObjCProtocolDecl(ObjCProtocolDecl *D) {
713   VisitRedeclarable(D);
714   VisitObjCContainerDecl(D);
715 
716   Record.push_back(D->isThisDeclarationADefinition());
717   if (D->isThisDeclarationADefinition()) {
718     Record.push_back(D->protocol_size());
719     for (const auto *I : D->protocols())
720       Writer.AddDeclRef(I, Record);
721     for (const auto &PL : D->protocol_locs())
722       Writer.AddSourceLocation(PL, Record);
723   }
724 
725   Code = serialization::DECL_OBJC_PROTOCOL;
726 }
727 
VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl * D)728 void ASTDeclWriter::VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D) {
729   VisitFieldDecl(D);
730   Code = serialization::DECL_OBJC_AT_DEFS_FIELD;
731 }
732 
VisitObjCCategoryDecl(ObjCCategoryDecl * D)733 void ASTDeclWriter::VisitObjCCategoryDecl(ObjCCategoryDecl *D) {
734   VisitObjCContainerDecl(D);
735   Writer.AddSourceLocation(D->getCategoryNameLoc(), Record);
736   Writer.AddSourceLocation(D->getIvarLBraceLoc(), Record);
737   Writer.AddSourceLocation(D->getIvarRBraceLoc(), Record);
738   Writer.AddDeclRef(D->getClassInterface(), Record);
739   AddObjCTypeParamList(D->TypeParamList);
740   Record.push_back(D->protocol_size());
741   for (const auto *I : D->protocols())
742     Writer.AddDeclRef(I, Record);
743   for (const auto &PL : D->protocol_locs())
744     Writer.AddSourceLocation(PL, Record);
745   Code = serialization::DECL_OBJC_CATEGORY;
746 }
747 
VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl * D)748 void ASTDeclWriter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D) {
749   VisitNamedDecl(D);
750   Writer.AddDeclRef(D->getClassInterface(), Record);
751   Code = serialization::DECL_OBJC_COMPATIBLE_ALIAS;
752 }
753 
VisitObjCPropertyDecl(ObjCPropertyDecl * D)754 void ASTDeclWriter::VisitObjCPropertyDecl(ObjCPropertyDecl *D) {
755   VisitNamedDecl(D);
756   Writer.AddSourceLocation(D->getAtLoc(), Record);
757   Writer.AddSourceLocation(D->getLParenLoc(), Record);
758   Writer.AddTypeRef(D->getType(), Record);
759   Writer.AddTypeSourceInfo(D->getTypeSourceInfo(), Record);
760   // FIXME: stable encoding
761   Record.push_back((unsigned)D->getPropertyAttributes());
762   Record.push_back((unsigned)D->getPropertyAttributesAsWritten());
763   // FIXME: stable encoding
764   Record.push_back((unsigned)D->getPropertyImplementation());
765   Writer.AddDeclarationName(D->getGetterName(), Record);
766   Writer.AddDeclarationName(D->getSetterName(), Record);
767   Writer.AddDeclRef(D->getGetterMethodDecl(), Record);
768   Writer.AddDeclRef(D->getSetterMethodDecl(), Record);
769   Writer.AddDeclRef(D->getPropertyIvarDecl(), Record);
770   Code = serialization::DECL_OBJC_PROPERTY;
771 }
772 
VisitObjCImplDecl(ObjCImplDecl * D)773 void ASTDeclWriter::VisitObjCImplDecl(ObjCImplDecl *D) {
774   VisitObjCContainerDecl(D);
775   Writer.AddDeclRef(D->getClassInterface(), Record);
776   // Abstract class (no need to define a stable serialization::DECL code).
777 }
778 
VisitObjCCategoryImplDecl(ObjCCategoryImplDecl * D)779 void ASTDeclWriter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D) {
780   VisitObjCImplDecl(D);
781   Writer.AddIdentifierRef(D->getIdentifier(), Record);
782   Writer.AddSourceLocation(D->getCategoryNameLoc(), Record);
783   Code = serialization::DECL_OBJC_CATEGORY_IMPL;
784 }
785 
VisitObjCImplementationDecl(ObjCImplementationDecl * D)786 void ASTDeclWriter::VisitObjCImplementationDecl(ObjCImplementationDecl *D) {
787   VisitObjCImplDecl(D);
788   Writer.AddDeclRef(D->getSuperClass(), Record);
789   Writer.AddSourceLocation(D->getSuperClassLoc(), Record);
790   Writer.AddSourceLocation(D->getIvarLBraceLoc(), Record);
791   Writer.AddSourceLocation(D->getIvarRBraceLoc(), Record);
792   Record.push_back(D->hasNonZeroConstructors());
793   Record.push_back(D->hasDestructors());
794   Record.push_back(D->NumIvarInitializers);
795   if (D->NumIvarInitializers)
796     Writer.AddCXXCtorInitializersRef(
797         llvm::makeArrayRef(D->init_begin(), D->init_end()), Record);
798   Code = serialization::DECL_OBJC_IMPLEMENTATION;
799 }
800 
VisitObjCPropertyImplDecl(ObjCPropertyImplDecl * D)801 void ASTDeclWriter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D) {
802   VisitDecl(D);
803   Writer.AddSourceLocation(D->getLocStart(), Record);
804   Writer.AddDeclRef(D->getPropertyDecl(), Record);
805   Writer.AddDeclRef(D->getPropertyIvarDecl(), Record);
806   Writer.AddSourceLocation(D->getPropertyIvarDeclLoc(), Record);
807   Writer.AddStmt(D->getGetterCXXConstructor());
808   Writer.AddStmt(D->getSetterCXXAssignment());
809   Code = serialization::DECL_OBJC_PROPERTY_IMPL;
810 }
811 
VisitFieldDecl(FieldDecl * D)812 void ASTDeclWriter::VisitFieldDecl(FieldDecl *D) {
813   VisitDeclaratorDecl(D);
814   Record.push_back(D->isMutable());
815   if (D->InitStorage.getInt() == FieldDecl::ISK_BitWidthOrNothing &&
816       D->InitStorage.getPointer() == nullptr) {
817     Record.push_back(0);
818   } else if (D->InitStorage.getInt() == FieldDecl::ISK_CapturedVLAType) {
819     Record.push_back(D->InitStorage.getInt() + 1);
820     Writer.AddTypeRef(
821         QualType(static_cast<Type *>(D->InitStorage.getPointer()), 0),
822         Record);
823   } else {
824     Record.push_back(D->InitStorage.getInt() + 1);
825     Writer.AddStmt(static_cast<Expr *>(D->InitStorage.getPointer()));
826   }
827   if (!D->getDeclName())
828     Writer.AddDeclRef(Context.getInstantiatedFromUnnamedFieldDecl(D), Record);
829 
830   if (D->getDeclContext() == D->getLexicalDeclContext() &&
831       !D->hasAttrs() &&
832       !D->isImplicit() &&
833       !D->isUsed(false) &&
834       !D->isInvalidDecl() &&
835       !D->isReferenced() &&
836       !D->isTopLevelDeclInObjCContainer() &&
837       !D->isModulePrivate() &&
838       !D->getBitWidth() &&
839       !D->hasInClassInitializer() &&
840       !D->hasExtInfo() &&
841       !ObjCIvarDecl::classofKind(D->getKind()) &&
842       !ObjCAtDefsFieldDecl::classofKind(D->getKind()) &&
843       D->getDeclName())
844     AbbrevToUse = Writer.getDeclFieldAbbrev();
845 
846   Code = serialization::DECL_FIELD;
847 }
848 
VisitMSPropertyDecl(MSPropertyDecl * D)849 void ASTDeclWriter::VisitMSPropertyDecl(MSPropertyDecl *D) {
850   VisitDeclaratorDecl(D);
851   Writer.AddIdentifierRef(D->getGetterId(), Record);
852   Writer.AddIdentifierRef(D->getSetterId(), Record);
853   Code = serialization::DECL_MS_PROPERTY;
854 }
855 
VisitIndirectFieldDecl(IndirectFieldDecl * D)856 void ASTDeclWriter::VisitIndirectFieldDecl(IndirectFieldDecl *D) {
857   VisitValueDecl(D);
858   Record.push_back(D->getChainingSize());
859 
860   for (const auto *P : D->chain())
861     Writer.AddDeclRef(P, Record);
862   Code = serialization::DECL_INDIRECTFIELD;
863 }
864 
VisitVarDecl(VarDecl * D)865 void ASTDeclWriter::VisitVarDecl(VarDecl *D) {
866   VisitRedeclarable(D);
867   VisitDeclaratorDecl(D);
868   Record.push_back(D->getStorageClass());
869   Record.push_back(D->getTSCSpec());
870   Record.push_back(D->getInitStyle());
871   if (!isa<ParmVarDecl>(D)) {
872     Record.push_back(D->isExceptionVariable());
873     Record.push_back(D->isNRVOVariable());
874     Record.push_back(D->isCXXForRangeDecl());
875     Record.push_back(D->isARCPseudoStrong());
876     Record.push_back(D->isConstexpr());
877     Record.push_back(D->isInitCapture());
878     Record.push_back(D->isPreviousDeclInSameBlockScope());
879   }
880   Record.push_back(D->getLinkageInternal());
881 
882   if (D->getInit()) {
883     Record.push_back(!D->isInitKnownICE() ? 1 : (D->isInitICE() ? 3 : 2));
884     Writer.AddStmt(D->getInit());
885   } else {
886     Record.push_back(0);
887   }
888 
889   enum {
890     VarNotTemplate = 0, VarTemplate, StaticDataMemberSpecialization
891   };
892   if (VarTemplateDecl *TemplD = D->getDescribedVarTemplate()) {
893     Record.push_back(VarTemplate);
894     Writer.AddDeclRef(TemplD, Record);
895   } else if (MemberSpecializationInfo *SpecInfo
896                = D->getMemberSpecializationInfo()) {
897     Record.push_back(StaticDataMemberSpecialization);
898     Writer.AddDeclRef(SpecInfo->getInstantiatedFrom(), Record);
899     Record.push_back(SpecInfo->getTemplateSpecializationKind());
900     Writer.AddSourceLocation(SpecInfo->getPointOfInstantiation(), Record);
901   } else {
902     Record.push_back(VarNotTemplate);
903   }
904 
905   if (D->getDeclContext() == D->getLexicalDeclContext() &&
906       !D->hasAttrs() &&
907       !D->isImplicit() &&
908       !D->isUsed(false) &&
909       !D->isInvalidDecl() &&
910       !D->isReferenced() &&
911       !D->isTopLevelDeclInObjCContainer() &&
912       D->getAccess() == AS_none &&
913       !D->isModulePrivate() &&
914       !needsAnonymousDeclarationNumber(D) &&
915       D->getDeclName().getNameKind() == DeclarationName::Identifier &&
916       !D->hasExtInfo() &&
917       D->getFirstDecl() == D->getMostRecentDecl() &&
918       D->getInitStyle() == VarDecl::CInit &&
919       D->getInit() == nullptr &&
920       !isa<ParmVarDecl>(D) &&
921       !isa<VarTemplateSpecializationDecl>(D) &&
922       !D->isConstexpr() &&
923       !D->isInitCapture() &&
924       !D->isPreviousDeclInSameBlockScope() &&
925       !D->getMemberSpecializationInfo())
926     AbbrevToUse = Writer.getDeclVarAbbrev();
927 
928   Code = serialization::DECL_VAR;
929 }
930 
VisitImplicitParamDecl(ImplicitParamDecl * D)931 void ASTDeclWriter::VisitImplicitParamDecl(ImplicitParamDecl *D) {
932   VisitVarDecl(D);
933   Code = serialization::DECL_IMPLICIT_PARAM;
934 }
935 
VisitParmVarDecl(ParmVarDecl * D)936 void ASTDeclWriter::VisitParmVarDecl(ParmVarDecl *D) {
937   VisitVarDecl(D);
938   Record.push_back(D->isObjCMethodParameter());
939   Record.push_back(D->getFunctionScopeDepth());
940   Record.push_back(D->getFunctionScopeIndex());
941   Record.push_back(D->getObjCDeclQualifier()); // FIXME: stable encoding
942   Record.push_back(D->isKNRPromoted());
943   Record.push_back(D->hasInheritedDefaultArg());
944   Record.push_back(D->hasUninstantiatedDefaultArg());
945   if (D->hasUninstantiatedDefaultArg())
946     Writer.AddStmt(D->getUninstantiatedDefaultArg());
947   Code = serialization::DECL_PARM_VAR;
948 
949   assert(!D->isARCPseudoStrong()); // can be true of ImplicitParamDecl
950 
951   // If the assumptions about the DECL_PARM_VAR abbrev are true, use it.  Here
952   // we dynamically check for the properties that we optimize for, but don't
953   // know are true of all PARM_VAR_DECLs.
954   if (D->getDeclContext() == D->getLexicalDeclContext() &&
955       !D->hasAttrs() &&
956       !D->hasExtInfo() &&
957       !D->isImplicit() &&
958       !D->isUsed(false) &&
959       !D->isInvalidDecl() &&
960       !D->isReferenced() &&
961       D->getAccess() == AS_none &&
962       !D->isModulePrivate() &&
963       D->getStorageClass() == 0 &&
964       D->getInitStyle() == VarDecl::CInit && // Can params have anything else?
965       D->getFunctionScopeDepth() == 0 &&
966       D->getObjCDeclQualifier() == 0 &&
967       !D->isKNRPromoted() &&
968       !D->hasInheritedDefaultArg() &&
969       D->getInit() == nullptr &&
970       !D->hasUninstantiatedDefaultArg())  // No default expr.
971     AbbrevToUse = Writer.getDeclParmVarAbbrev();
972 
973   // Check things we know are true of *every* PARM_VAR_DECL, which is more than
974   // just us assuming it.
975   assert(!D->getTSCSpec() && "PARM_VAR_DECL can't use TLS");
976   assert(D->getAccess() == AS_none && "PARM_VAR_DECL can't be public/private");
977   assert(!D->isExceptionVariable() && "PARM_VAR_DECL can't be exception var");
978   assert(D->getPreviousDecl() == nullptr && "PARM_VAR_DECL can't be redecl");
979   assert(!D->isStaticDataMember() &&
980          "PARM_VAR_DECL can't be static data member");
981 }
982 
VisitFileScopeAsmDecl(FileScopeAsmDecl * D)983 void ASTDeclWriter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
984   VisitDecl(D);
985   Writer.AddStmt(D->getAsmString());
986   Writer.AddSourceLocation(D->getRParenLoc(), Record);
987   Code = serialization::DECL_FILE_SCOPE_ASM;
988 }
989 
VisitEmptyDecl(EmptyDecl * D)990 void ASTDeclWriter::VisitEmptyDecl(EmptyDecl *D) {
991   VisitDecl(D);
992   Code = serialization::DECL_EMPTY;
993 }
994 
VisitBlockDecl(BlockDecl * D)995 void ASTDeclWriter::VisitBlockDecl(BlockDecl *D) {
996   VisitDecl(D);
997   Writer.AddStmt(D->getBody());
998   Writer.AddTypeSourceInfo(D->getSignatureAsWritten(), Record);
999   Record.push_back(D->param_size());
1000   for (FunctionDecl::param_iterator P = D->param_begin(), PEnd = D->param_end();
1001        P != PEnd; ++P)
1002     Writer.AddDeclRef(*P, Record);
1003   Record.push_back(D->isVariadic());
1004   Record.push_back(D->blockMissingReturnType());
1005   Record.push_back(D->isConversionFromLambda());
1006   Record.push_back(D->capturesCXXThis());
1007   Record.push_back(D->getNumCaptures());
1008   for (const auto &capture : D->captures()) {
1009     Writer.AddDeclRef(capture.getVariable(), Record);
1010 
1011     unsigned flags = 0;
1012     if (capture.isByRef()) flags |= 1;
1013     if (capture.isNested()) flags |= 2;
1014     if (capture.hasCopyExpr()) flags |= 4;
1015     Record.push_back(flags);
1016 
1017     if (capture.hasCopyExpr()) Writer.AddStmt(capture.getCopyExpr());
1018   }
1019 
1020   Code = serialization::DECL_BLOCK;
1021 }
1022 
VisitCapturedDecl(CapturedDecl * CD)1023 void ASTDeclWriter::VisitCapturedDecl(CapturedDecl *CD) {
1024   Record.push_back(CD->getNumParams());
1025   VisitDecl(CD);
1026   Record.push_back(CD->getContextParamPosition());
1027   Record.push_back(CD->isNothrow() ? 1 : 0);
1028   // Body is stored by VisitCapturedStmt.
1029   for (unsigned I = 0; I < CD->getNumParams(); ++I)
1030     Writer.AddDeclRef(CD->getParam(I), Record);
1031   Code = serialization::DECL_CAPTURED;
1032 }
1033 
VisitLinkageSpecDecl(LinkageSpecDecl * D)1034 void ASTDeclWriter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
1035   VisitDecl(D);
1036   Record.push_back(D->getLanguage());
1037   Writer.AddSourceLocation(D->getExternLoc(), Record);
1038   Writer.AddSourceLocation(D->getRBraceLoc(), Record);
1039   Code = serialization::DECL_LINKAGE_SPEC;
1040 }
1041 
VisitLabelDecl(LabelDecl * D)1042 void ASTDeclWriter::VisitLabelDecl(LabelDecl *D) {
1043   VisitNamedDecl(D);
1044   Writer.AddSourceLocation(D->getLocStart(), Record);
1045   Code = serialization::DECL_LABEL;
1046 }
1047 
1048 
VisitNamespaceDecl(NamespaceDecl * D)1049 void ASTDeclWriter::VisitNamespaceDecl(NamespaceDecl *D) {
1050   VisitRedeclarable(D);
1051   VisitNamedDecl(D);
1052   Record.push_back(D->isInline());
1053   Writer.AddSourceLocation(D->getLocStart(), Record);
1054   Writer.AddSourceLocation(D->getRBraceLoc(), Record);
1055 
1056   if (D->isOriginalNamespace())
1057     Writer.AddDeclRef(D->getAnonymousNamespace(), Record);
1058   Code = serialization::DECL_NAMESPACE;
1059 
1060   if (Writer.hasChain() && D->isAnonymousNamespace() &&
1061       D == D->getMostRecentDecl()) {
1062     // This is a most recent reopening of the anonymous namespace. If its parent
1063     // is in a previous PCH (or is the TU), mark that parent for update, because
1064     // the original namespace always points to the latest re-opening of its
1065     // anonymous namespace.
1066     Decl *Parent = cast<Decl>(
1067         D->getParent()->getRedeclContext()->getPrimaryContext());
1068     if (Parent->isFromASTFile() || isa<TranslationUnitDecl>(Parent)) {
1069       Writer.DeclUpdates[Parent].push_back(
1070           ASTWriter::DeclUpdate(UPD_CXX_ADDED_ANONYMOUS_NAMESPACE, D));
1071     }
1072   }
1073 }
1074 
VisitNamespaceAliasDecl(NamespaceAliasDecl * D)1075 void ASTDeclWriter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
1076   VisitRedeclarable(D);
1077   VisitNamedDecl(D);
1078   Writer.AddSourceLocation(D->getNamespaceLoc(), Record);
1079   Writer.AddSourceLocation(D->getTargetNameLoc(), Record);
1080   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
1081   Writer.AddDeclRef(D->getNamespace(), Record);
1082   Code = serialization::DECL_NAMESPACE_ALIAS;
1083 }
1084 
VisitUsingDecl(UsingDecl * D)1085 void ASTDeclWriter::VisitUsingDecl(UsingDecl *D) {
1086   VisitNamedDecl(D);
1087   Writer.AddSourceLocation(D->getUsingLoc(), Record);
1088   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
1089   Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
1090   Writer.AddDeclRef(D->FirstUsingShadow.getPointer(), Record);
1091   Record.push_back(D->hasTypename());
1092   Writer.AddDeclRef(Context.getInstantiatedFromUsingDecl(D), Record);
1093   Code = serialization::DECL_USING;
1094 }
1095 
VisitUsingShadowDecl(UsingShadowDecl * D)1096 void ASTDeclWriter::VisitUsingShadowDecl(UsingShadowDecl *D) {
1097   VisitRedeclarable(D);
1098   VisitNamedDecl(D);
1099   Writer.AddDeclRef(D->getTargetDecl(), Record);
1100   Writer.AddDeclRef(D->UsingOrNextShadow, Record);
1101   Writer.AddDeclRef(Context.getInstantiatedFromUsingShadowDecl(D), Record);
1102   Code = serialization::DECL_USING_SHADOW;
1103 }
1104 
VisitUsingDirectiveDecl(UsingDirectiveDecl * D)1105 void ASTDeclWriter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
1106   VisitNamedDecl(D);
1107   Writer.AddSourceLocation(D->getUsingLoc(), Record);
1108   Writer.AddSourceLocation(D->getNamespaceKeyLocation(), Record);
1109   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
1110   Writer.AddDeclRef(D->getNominatedNamespace(), Record);
1111   Writer.AddDeclRef(dyn_cast<Decl>(D->getCommonAncestor()), Record);
1112   Code = serialization::DECL_USING_DIRECTIVE;
1113 }
1114 
VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl * D)1115 void ASTDeclWriter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
1116   VisitValueDecl(D);
1117   Writer.AddSourceLocation(D->getUsingLoc(), Record);
1118   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
1119   Writer.AddDeclarationNameLoc(D->DNLoc, D->getDeclName(), Record);
1120   Code = serialization::DECL_UNRESOLVED_USING_VALUE;
1121 }
1122 
VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl * D)1123 void ASTDeclWriter::VisitUnresolvedUsingTypenameDecl(
1124                                                UnresolvedUsingTypenameDecl *D) {
1125   VisitTypeDecl(D);
1126   Writer.AddSourceLocation(D->getTypenameLoc(), Record);
1127   Writer.AddNestedNameSpecifierLoc(D->getQualifierLoc(), Record);
1128   Code = serialization::DECL_UNRESOLVED_USING_TYPENAME;
1129 }
1130 
VisitCXXRecordDecl(CXXRecordDecl * D)1131 void ASTDeclWriter::VisitCXXRecordDecl(CXXRecordDecl *D) {
1132   VisitRecordDecl(D);
1133 
1134   enum {
1135     CXXRecNotTemplate = 0, CXXRecTemplate, CXXRecMemberSpecialization
1136   };
1137   if (ClassTemplateDecl *TemplD = D->getDescribedClassTemplate()) {
1138     Record.push_back(CXXRecTemplate);
1139     Writer.AddDeclRef(TemplD, Record);
1140   } else if (MemberSpecializationInfo *MSInfo
1141                = D->getMemberSpecializationInfo()) {
1142     Record.push_back(CXXRecMemberSpecialization);
1143     Writer.AddDeclRef(MSInfo->getInstantiatedFrom(), Record);
1144     Record.push_back(MSInfo->getTemplateSpecializationKind());
1145     Writer.AddSourceLocation(MSInfo->getPointOfInstantiation(), Record);
1146   } else {
1147     Record.push_back(CXXRecNotTemplate);
1148   }
1149 
1150   Record.push_back(D->isThisDeclarationADefinition());
1151   if (D->isThisDeclarationADefinition())
1152     Writer.AddCXXDefinitionData(D, Record);
1153 
1154   // Store (what we currently believe to be) the key function to avoid
1155   // deserializing every method so we can compute it.
1156   if (D->IsCompleteDefinition)
1157     Writer.AddDeclRef(Context.getCurrentKeyFunction(D), Record);
1158 
1159   Code = serialization::DECL_CXX_RECORD;
1160 }
1161 
VisitCXXMethodDecl(CXXMethodDecl * D)1162 void ASTDeclWriter::VisitCXXMethodDecl(CXXMethodDecl *D) {
1163   VisitFunctionDecl(D);
1164   if (D->isCanonicalDecl()) {
1165     Record.push_back(D->size_overridden_methods());
1166     for (CXXMethodDecl::method_iterator
1167            I = D->begin_overridden_methods(), E = D->end_overridden_methods();
1168            I != E; ++I)
1169       Writer.AddDeclRef(*I, Record);
1170   } else {
1171     // We only need to record overridden methods once for the canonical decl.
1172     Record.push_back(0);
1173   }
1174 
1175   if (D->getDeclContext() == D->getLexicalDeclContext() &&
1176       D->getFirstDecl() == D->getMostRecentDecl() &&
1177       !D->isInvalidDecl() &&
1178       !D->hasAttrs() &&
1179       !D->isTopLevelDeclInObjCContainer() &&
1180       D->getDeclName().getNameKind() == DeclarationName::Identifier &&
1181       !D->hasExtInfo() &&
1182       !D->hasInheritedPrototype() &&
1183       D->hasWrittenPrototype())
1184     AbbrevToUse = Writer.getDeclCXXMethodAbbrev();
1185 
1186   Code = serialization::DECL_CXX_METHOD;
1187 }
1188 
VisitCXXConstructorDecl(CXXConstructorDecl * D)1189 void ASTDeclWriter::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
1190   VisitCXXMethodDecl(D);
1191 
1192   Writer.AddDeclRef(D->getInheritedConstructor(), Record);
1193   Record.push_back(D->IsExplicitSpecified);
1194 
1195   Code = serialization::DECL_CXX_CONSTRUCTOR;
1196 }
1197 
VisitCXXDestructorDecl(CXXDestructorDecl * D)1198 void ASTDeclWriter::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
1199   VisitCXXMethodDecl(D);
1200 
1201   Writer.AddDeclRef(D->getOperatorDelete(), Record);
1202 
1203   Code = serialization::DECL_CXX_DESTRUCTOR;
1204 }
1205 
VisitCXXConversionDecl(CXXConversionDecl * D)1206 void ASTDeclWriter::VisitCXXConversionDecl(CXXConversionDecl *D) {
1207   VisitCXXMethodDecl(D);
1208   Record.push_back(D->IsExplicitSpecified);
1209   Code = serialization::DECL_CXX_CONVERSION;
1210 }
1211 
VisitImportDecl(ImportDecl * D)1212 void ASTDeclWriter::VisitImportDecl(ImportDecl *D) {
1213   VisitDecl(D);
1214   Record.push_back(Writer.getSubmoduleID(D->getImportedModule()));
1215   ArrayRef<SourceLocation> IdentifierLocs = D->getIdentifierLocs();
1216   Record.push_back(!IdentifierLocs.empty());
1217   if (IdentifierLocs.empty()) {
1218     Writer.AddSourceLocation(D->getLocEnd(), Record);
1219     Record.push_back(1);
1220   } else {
1221     for (unsigned I = 0, N = IdentifierLocs.size(); I != N; ++I)
1222       Writer.AddSourceLocation(IdentifierLocs[I], Record);
1223     Record.push_back(IdentifierLocs.size());
1224   }
1225   // Note: the number of source locations must always be the last element in
1226   // the record.
1227   Code = serialization::DECL_IMPORT;
1228 }
1229 
VisitAccessSpecDecl(AccessSpecDecl * D)1230 void ASTDeclWriter::VisitAccessSpecDecl(AccessSpecDecl *D) {
1231   VisitDecl(D);
1232   Writer.AddSourceLocation(D->getColonLoc(), Record);
1233   Code = serialization::DECL_ACCESS_SPEC;
1234 }
1235 
VisitFriendDecl(FriendDecl * D)1236 void ASTDeclWriter::VisitFriendDecl(FriendDecl *D) {
1237   // Record the number of friend type template parameter lists here
1238   // so as to simplify memory allocation during deserialization.
1239   Record.push_back(D->NumTPLists);
1240   VisitDecl(D);
1241   bool hasFriendDecl = D->Friend.is<NamedDecl*>();
1242   Record.push_back(hasFriendDecl);
1243   if (hasFriendDecl)
1244     Writer.AddDeclRef(D->getFriendDecl(), Record);
1245   else
1246     Writer.AddTypeSourceInfo(D->getFriendType(), Record);
1247   for (unsigned i = 0; i < D->NumTPLists; ++i)
1248     Writer.AddTemplateParameterList(D->getFriendTypeTemplateParameterList(i),
1249                                     Record);
1250   Writer.AddDeclRef(D->getNextFriend(), Record);
1251   Record.push_back(D->UnsupportedFriend);
1252   Writer.AddSourceLocation(D->FriendLoc, Record);
1253   Code = serialization::DECL_FRIEND;
1254 }
1255 
VisitFriendTemplateDecl(FriendTemplateDecl * D)1256 void ASTDeclWriter::VisitFriendTemplateDecl(FriendTemplateDecl *D) {
1257   VisitDecl(D);
1258   Record.push_back(D->getNumTemplateParameters());
1259   for (unsigned i = 0, e = D->getNumTemplateParameters(); i != e; ++i)
1260     Writer.AddTemplateParameterList(D->getTemplateParameterList(i), Record);
1261   Record.push_back(D->getFriendDecl() != nullptr);
1262   if (D->getFriendDecl())
1263     Writer.AddDeclRef(D->getFriendDecl(), Record);
1264   else
1265     Writer.AddTypeSourceInfo(D->getFriendType(), Record);
1266   Writer.AddSourceLocation(D->getFriendLoc(), Record);
1267   Code = serialization::DECL_FRIEND_TEMPLATE;
1268 }
1269 
VisitTemplateDecl(TemplateDecl * D)1270 void ASTDeclWriter::VisitTemplateDecl(TemplateDecl *D) {
1271   VisitNamedDecl(D);
1272 
1273   Writer.AddDeclRef(D->getTemplatedDecl(), Record);
1274   Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1275 }
1276 
VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl * D)1277 void ASTDeclWriter::VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D) {
1278   VisitRedeclarable(D);
1279 
1280   // Emit data to initialize CommonOrPrev before VisitTemplateDecl so that
1281   // getCommonPtr() can be used while this is still initializing.
1282   if (D->isFirstDecl()) {
1283     // This declaration owns the 'common' pointer, so serialize that data now.
1284     Writer.AddDeclRef(D->getInstantiatedFromMemberTemplate(), Record);
1285     if (D->getInstantiatedFromMemberTemplate())
1286       Record.push_back(D->isMemberSpecialization());
1287   }
1288 
1289   VisitTemplateDecl(D);
1290   Record.push_back(D->getIdentifierNamespace());
1291 }
1292 
VisitClassTemplateDecl(ClassTemplateDecl * D)1293 void ASTDeclWriter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1294   VisitRedeclarableTemplateDecl(D);
1295 
1296   if (D->isFirstDecl())
1297     AddTemplateSpecializations(D);
1298   Code = serialization::DECL_CLASS_TEMPLATE;
1299 }
1300 
VisitClassTemplateSpecializationDecl(ClassTemplateSpecializationDecl * D)1301 void ASTDeclWriter::VisitClassTemplateSpecializationDecl(
1302                                            ClassTemplateSpecializationDecl *D) {
1303   RegisterTemplateSpecialization(D->getSpecializedTemplate(), D);
1304 
1305   VisitCXXRecordDecl(D);
1306 
1307   llvm::PointerUnion<ClassTemplateDecl *,
1308                      ClassTemplatePartialSpecializationDecl *> InstFrom
1309     = D->getSpecializedTemplateOrPartial();
1310   if (Decl *InstFromD = InstFrom.dyn_cast<ClassTemplateDecl *>()) {
1311     Writer.AddDeclRef(InstFromD, Record);
1312   } else {
1313     Writer.AddDeclRef(InstFrom.get<ClassTemplatePartialSpecializationDecl *>(),
1314                       Record);
1315     Writer.AddTemplateArgumentList(&D->getTemplateInstantiationArgs(), Record);
1316   }
1317 
1318   Writer.AddTemplateArgumentList(&D->getTemplateArgs(), Record);
1319   Writer.AddSourceLocation(D->getPointOfInstantiation(), Record);
1320   Record.push_back(D->getSpecializationKind());
1321   Record.push_back(D->isCanonicalDecl());
1322 
1323   if (D->isCanonicalDecl()) {
1324     // When reading, we'll add it to the folding set of the following template.
1325     Writer.AddDeclRef(D->getSpecializedTemplate()->getCanonicalDecl(), Record);
1326   }
1327 
1328   // Explicit info.
1329   Writer.AddTypeSourceInfo(D->getTypeAsWritten(), Record);
1330   if (D->getTypeAsWritten()) {
1331     Writer.AddSourceLocation(D->getExternLoc(), Record);
1332     Writer.AddSourceLocation(D->getTemplateKeywordLoc(), Record);
1333   }
1334 
1335   Code = serialization::DECL_CLASS_TEMPLATE_SPECIALIZATION;
1336 }
1337 
VisitClassTemplatePartialSpecializationDecl(ClassTemplatePartialSpecializationDecl * D)1338 void ASTDeclWriter::VisitClassTemplatePartialSpecializationDecl(
1339                                     ClassTemplatePartialSpecializationDecl *D) {
1340   VisitClassTemplateSpecializationDecl(D);
1341 
1342   Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1343   Writer.AddASTTemplateArgumentListInfo(D->getTemplateArgsAsWritten(), Record);
1344 
1345   // These are read/set from/to the first declaration.
1346   if (D->getPreviousDecl() == nullptr) {
1347     Writer.AddDeclRef(D->getInstantiatedFromMember(), Record);
1348     Record.push_back(D->isMemberSpecialization());
1349   }
1350 
1351   Code = serialization::DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION;
1352 }
1353 
VisitVarTemplateDecl(VarTemplateDecl * D)1354 void ASTDeclWriter::VisitVarTemplateDecl(VarTemplateDecl *D) {
1355   VisitRedeclarableTemplateDecl(D);
1356 
1357   if (D->isFirstDecl())
1358     AddTemplateSpecializations(D);
1359   Code = serialization::DECL_VAR_TEMPLATE;
1360 }
1361 
VisitVarTemplateSpecializationDecl(VarTemplateSpecializationDecl * D)1362 void ASTDeclWriter::VisitVarTemplateSpecializationDecl(
1363     VarTemplateSpecializationDecl *D) {
1364   RegisterTemplateSpecialization(D->getSpecializedTemplate(), D);
1365 
1366   VisitVarDecl(D);
1367 
1368   llvm::PointerUnion<VarTemplateDecl *, VarTemplatePartialSpecializationDecl *>
1369   InstFrom = D->getSpecializedTemplateOrPartial();
1370   if (Decl *InstFromD = InstFrom.dyn_cast<VarTemplateDecl *>()) {
1371     Writer.AddDeclRef(InstFromD, Record);
1372   } else {
1373     Writer.AddDeclRef(InstFrom.get<VarTemplatePartialSpecializationDecl *>(),
1374                       Record);
1375     Writer.AddTemplateArgumentList(&D->getTemplateInstantiationArgs(), Record);
1376   }
1377 
1378   // Explicit info.
1379   Writer.AddTypeSourceInfo(D->getTypeAsWritten(), Record);
1380   if (D->getTypeAsWritten()) {
1381     Writer.AddSourceLocation(D->getExternLoc(), Record);
1382     Writer.AddSourceLocation(D->getTemplateKeywordLoc(), Record);
1383   }
1384 
1385   Writer.AddTemplateArgumentList(&D->getTemplateArgs(), Record);
1386   Writer.AddSourceLocation(D->getPointOfInstantiation(), Record);
1387   Record.push_back(D->getSpecializationKind());
1388   Record.push_back(D->isCanonicalDecl());
1389 
1390   if (D->isCanonicalDecl()) {
1391     // When reading, we'll add it to the folding set of the following template.
1392     Writer.AddDeclRef(D->getSpecializedTemplate()->getCanonicalDecl(), Record);
1393   }
1394 
1395   Code = serialization::DECL_VAR_TEMPLATE_SPECIALIZATION;
1396 }
1397 
VisitVarTemplatePartialSpecializationDecl(VarTemplatePartialSpecializationDecl * D)1398 void ASTDeclWriter::VisitVarTemplatePartialSpecializationDecl(
1399     VarTemplatePartialSpecializationDecl *D) {
1400   VisitVarTemplateSpecializationDecl(D);
1401 
1402   Writer.AddTemplateParameterList(D->getTemplateParameters(), Record);
1403   Writer.AddASTTemplateArgumentListInfo(D->getTemplateArgsAsWritten(), Record);
1404 
1405   // These are read/set from/to the first declaration.
1406   if (D->getPreviousDecl() == nullptr) {
1407     Writer.AddDeclRef(D->getInstantiatedFromMember(), Record);
1408     Record.push_back(D->isMemberSpecialization());
1409   }
1410 
1411   Code = serialization::DECL_VAR_TEMPLATE_PARTIAL_SPECIALIZATION;
1412 }
1413 
VisitClassScopeFunctionSpecializationDecl(ClassScopeFunctionSpecializationDecl * D)1414 void ASTDeclWriter::VisitClassScopeFunctionSpecializationDecl(
1415                                     ClassScopeFunctionSpecializationDecl *D) {
1416   VisitDecl(D);
1417   Writer.AddDeclRef(D->getSpecialization(), Record);
1418   Code = serialization::DECL_CLASS_SCOPE_FUNCTION_SPECIALIZATION;
1419 }
1420 
1421 
VisitFunctionTemplateDecl(FunctionTemplateDecl * D)1422 void ASTDeclWriter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1423   VisitRedeclarableTemplateDecl(D);
1424 
1425   if (D->isFirstDecl())
1426     AddTemplateSpecializations(D);
1427   Code = serialization::DECL_FUNCTION_TEMPLATE;
1428 }
1429 
VisitTemplateTypeParmDecl(TemplateTypeParmDecl * D)1430 void ASTDeclWriter::VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D) {
1431   VisitTypeDecl(D);
1432 
1433   Record.push_back(D->wasDeclaredWithTypename());
1434 
1435   bool OwnsDefaultArg = D->hasDefaultArgument() &&
1436                         !D->defaultArgumentWasInherited();
1437   Record.push_back(OwnsDefaultArg);
1438   if (OwnsDefaultArg)
1439     Writer.AddTypeSourceInfo(D->getDefaultArgumentInfo(), Record);
1440 
1441   Code = serialization::DECL_TEMPLATE_TYPE_PARM;
1442 }
1443 
VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl * D)1444 void ASTDeclWriter::VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {
1445   // For an expanded parameter pack, record the number of expansion types here
1446   // so that it's easier for deserialization to allocate the right amount of
1447   // memory.
1448   if (D->isExpandedParameterPack())
1449     Record.push_back(D->getNumExpansionTypes());
1450 
1451   VisitDeclaratorDecl(D);
1452   // TemplateParmPosition.
1453   Record.push_back(D->getDepth());
1454   Record.push_back(D->getPosition());
1455 
1456   if (D->isExpandedParameterPack()) {
1457     for (unsigned I = 0, N = D->getNumExpansionTypes(); I != N; ++I) {
1458       Writer.AddTypeRef(D->getExpansionType(I), Record);
1459       Writer.AddTypeSourceInfo(D->getExpansionTypeSourceInfo(I), Record);
1460     }
1461 
1462     Code = serialization::DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK;
1463   } else {
1464     // Rest of NonTypeTemplateParmDecl.
1465     Record.push_back(D->isParameterPack());
1466     bool OwnsDefaultArg = D->hasDefaultArgument() &&
1467                           !D->defaultArgumentWasInherited();
1468     Record.push_back(OwnsDefaultArg);
1469     if (OwnsDefaultArg)
1470       Writer.AddStmt(D->getDefaultArgument());
1471     Code = serialization::DECL_NON_TYPE_TEMPLATE_PARM;
1472   }
1473 }
1474 
VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl * D)1475 void ASTDeclWriter::VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D) {
1476   // For an expanded parameter pack, record the number of expansion types here
1477   // so that it's easier for deserialization to allocate the right amount of
1478   // memory.
1479   if (D->isExpandedParameterPack())
1480     Record.push_back(D->getNumExpansionTemplateParameters());
1481 
1482   VisitTemplateDecl(D);
1483   // TemplateParmPosition.
1484   Record.push_back(D->getDepth());
1485   Record.push_back(D->getPosition());
1486 
1487   if (D->isExpandedParameterPack()) {
1488     for (unsigned I = 0, N = D->getNumExpansionTemplateParameters();
1489          I != N; ++I)
1490       Writer.AddTemplateParameterList(D->getExpansionTemplateParameters(I),
1491                                       Record);
1492     Code = serialization::DECL_EXPANDED_TEMPLATE_TEMPLATE_PARM_PACK;
1493   } else {
1494     // Rest of TemplateTemplateParmDecl.
1495     Record.push_back(D->isParameterPack());
1496     bool OwnsDefaultArg = D->hasDefaultArgument() &&
1497                           !D->defaultArgumentWasInherited();
1498     Record.push_back(OwnsDefaultArg);
1499     if (OwnsDefaultArg)
1500       Writer.AddTemplateArgumentLoc(D->getDefaultArgument(), Record);
1501     Code = serialization::DECL_TEMPLATE_TEMPLATE_PARM;
1502   }
1503 }
1504 
VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl * D)1505 void ASTDeclWriter::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) {
1506   VisitRedeclarableTemplateDecl(D);
1507   Code = serialization::DECL_TYPE_ALIAS_TEMPLATE;
1508 }
1509 
VisitStaticAssertDecl(StaticAssertDecl * D)1510 void ASTDeclWriter::VisitStaticAssertDecl(StaticAssertDecl *D) {
1511   VisitDecl(D);
1512   Writer.AddStmt(D->getAssertExpr());
1513   Record.push_back(D->isFailed());
1514   Writer.AddStmt(D->getMessage());
1515   Writer.AddSourceLocation(D->getRParenLoc(), Record);
1516   Code = serialization::DECL_STATIC_ASSERT;
1517 }
1518 
1519 /// \brief Emit the DeclContext part of a declaration context decl.
1520 ///
1521 /// \param LexicalOffset the offset at which the DECL_CONTEXT_LEXICAL
1522 /// block for this declaration context is stored. May be 0 to indicate
1523 /// that there are no declarations stored within this context.
1524 ///
1525 /// \param VisibleOffset the offset at which the DECL_CONTEXT_VISIBLE
1526 /// block for this declaration context is stored. May be 0 to indicate
1527 /// that there are no declarations visible from this context. Note
1528 /// that this value will not be emitted for non-primary declaration
1529 /// contexts.
VisitDeclContext(DeclContext * DC,uint64_t LexicalOffset,uint64_t VisibleOffset)1530 void ASTDeclWriter::VisitDeclContext(DeclContext *DC, uint64_t LexicalOffset,
1531                                      uint64_t VisibleOffset) {
1532   Record.push_back(LexicalOffset);
1533   Record.push_back(VisibleOffset);
1534 }
1535 
getFirstLocalDecl(const Decl * D)1536 const Decl *ASTWriter::getFirstLocalDecl(const Decl *D) {
1537   /// \brief Is this a local declaration (that is, one that will be written to
1538   /// our AST file)? This is the case for declarations that are neither imported
1539   /// from another AST file nor predefined.
1540   auto IsLocalDecl = [&](const Decl *D) -> bool {
1541     if (D->isFromASTFile())
1542       return false;
1543     auto I = DeclIDs.find(D);
1544     return (I == DeclIDs.end() || I->second >= NUM_PREDEF_DECL_IDS);
1545   };
1546 
1547   assert(IsLocalDecl(D) && "expected a local declaration");
1548 
1549   const Decl *Canon = D->getCanonicalDecl();
1550   if (IsLocalDecl(Canon))
1551     return Canon;
1552 
1553   const Decl *&CacheEntry = FirstLocalDeclCache[Canon];
1554   if (CacheEntry)
1555     return CacheEntry;
1556 
1557   for (const Decl *Redecl = D; Redecl; Redecl = Redecl->getPreviousDecl())
1558     if (IsLocalDecl(Redecl))
1559       D = Redecl;
1560   return CacheEntry = D;
1561 }
1562 
1563 template <typename T>
VisitRedeclarable(Redeclarable<T> * D)1564 void ASTDeclWriter::VisitRedeclarable(Redeclarable<T> *D) {
1565   T *First = D->getFirstDecl();
1566   T *MostRecent = First->getMostRecentDecl();
1567   T *DAsT = static_cast<T *>(D);
1568   if (MostRecent != First) {
1569     assert(isRedeclarableDeclKind(DAsT->getKind()) &&
1570            "Not considered redeclarable?");
1571 
1572     Writer.AddDeclRef(First, Record);
1573 
1574     // Write out a list of local redeclarations of this declaration if it's the
1575     // first local declaration in the chain.
1576     const Decl *FirstLocal = Writer.getFirstLocalDecl(DAsT);
1577     if (DAsT == FirstLocal) {
1578       // Emit a list of all imported first declarations so that we can be sure
1579       // that all redeclarations visible to this module are before D in the
1580       // redecl chain.
1581       unsigned I = Record.size();
1582       Record.push_back(0);
1583       if (Writer.Chain)
1584         AddFirstDeclFromEachModule(DAsT, /*IncludeLocal*/false);
1585       // This is the number of imported first declarations + 1.
1586       Record[I] = Record.size() - I;
1587 
1588       // Collect the set of local redeclarations of this declaration, from
1589       // newest to oldest.
1590       RecordData LocalRedecls;
1591       for (const Decl *Prev = FirstLocal->getMostRecentDecl();
1592            Prev != FirstLocal; Prev = Prev->getPreviousDecl())
1593         if (!Prev->isFromASTFile())
1594           Writer.AddDeclRef(Prev, LocalRedecls);
1595 
1596       // If we have any redecls, write them now as a separate record preceding
1597       // the declaration itself.
1598       if (LocalRedecls.empty())
1599         Record.push_back(0);
1600       else {
1601         Record.push_back(Writer.Stream.GetCurrentBitNo());
1602         Writer.Stream.EmitRecord(LOCAL_REDECLARATIONS, LocalRedecls);
1603       }
1604     } else {
1605       Record.push_back(0);
1606       Writer.AddDeclRef(FirstLocal, Record);
1607     }
1608 
1609     // Make sure that we serialize both the previous and the most-recent
1610     // declarations, which (transitively) ensures that all declarations in the
1611     // chain get serialized.
1612     //
1613     // FIXME: This is not correct; when we reach an imported declaration we
1614     // won't emit its previous declaration.
1615     (void)Writer.GetDeclRef(D->getPreviousDecl());
1616     (void)Writer.GetDeclRef(MostRecent);
1617   } else {
1618     // We use the sentinel value 0 to indicate an only declaration.
1619     Record.push_back(0);
1620   }
1621 }
1622 
VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl * D)1623 void ASTDeclWriter::VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D) {
1624   Record.push_back(D->varlist_size());
1625   VisitDecl(D);
1626   for (auto *I : D->varlists())
1627     Writer.AddStmt(I);
1628   Code = serialization::DECL_OMP_THREADPRIVATE;
1629 }
1630 
1631 //===----------------------------------------------------------------------===//
1632 // ASTWriter Implementation
1633 //===----------------------------------------------------------------------===//
1634 
WriteDeclAbbrevs()1635 void ASTWriter::WriteDeclAbbrevs() {
1636   using namespace llvm;
1637 
1638   BitCodeAbbrev *Abv;
1639 
1640   // Abbreviation for DECL_FIELD
1641   Abv = new BitCodeAbbrev();
1642   Abv->Add(BitCodeAbbrevOp(serialization::DECL_FIELD));
1643   // Decl
1644   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1645   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1646   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1647   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1648   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1649   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1650   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1651   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1652   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1653   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1654   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1655   // NamedDecl
1656   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1657   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1658   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1659   // ValueDecl
1660   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1661   // DeclaratorDecl
1662   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1663   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1664   // FieldDecl
1665   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1666   Abv->Add(BitCodeAbbrevOp(0));                       //getBitWidth
1667   // Type Source Info
1668   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1669   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1670   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1671   DeclFieldAbbrev = Stream.EmitAbbrev(Abv);
1672 
1673   // Abbreviation for DECL_OBJC_IVAR
1674   Abv = new BitCodeAbbrev();
1675   Abv->Add(BitCodeAbbrevOp(serialization::DECL_OBJC_IVAR));
1676   // Decl
1677   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1678   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1679   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1680   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1681   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1682   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1683   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1684   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1685   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1686   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1687   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1688   // NamedDecl
1689   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1690   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1691   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1692   // ValueDecl
1693   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1694   // DeclaratorDecl
1695   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1696   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1697   // FieldDecl
1698   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1699   Abv->Add(BitCodeAbbrevOp(0));                       //getBitWidth
1700   // ObjC Ivar
1701   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getAccessControl
1702   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getSynthesize
1703   // Type Source Info
1704   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1705   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1706   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1707   DeclObjCIvarAbbrev = Stream.EmitAbbrev(Abv);
1708 
1709   // Abbreviation for DECL_ENUM
1710   Abv = new BitCodeAbbrev();
1711   Abv->Add(BitCodeAbbrevOp(serialization::DECL_ENUM));
1712   // Redeclarable
1713   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1714   // Decl
1715   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1716   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1717   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1718   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1719   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1720   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1721   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1722   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1723   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1724   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1725   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1726   // NamedDecl
1727   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1728   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1729   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1730   // TypeDecl
1731   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1732   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1733   // TagDecl
1734   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1735   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1736   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1737   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1738   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1739   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsCompleteDefinitionRequired
1740   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1741   Abv->Add(BitCodeAbbrevOp(0));                         // ExtInfoKind
1742   // EnumDecl
1743   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // AddTypeRef
1744   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IntegerType
1745   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getPromotionType
1746   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumPositiveBits
1747   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumNegativeBits
1748   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScoped
1749   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScopedUsingClassTag
1750   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isFixed
1751   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // InstantiatedMembEnum
1752   // DC
1753   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1754   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1755   DeclEnumAbbrev = Stream.EmitAbbrev(Abv);
1756 
1757   // Abbreviation for DECL_RECORD
1758   Abv = new BitCodeAbbrev();
1759   Abv->Add(BitCodeAbbrevOp(serialization::DECL_RECORD));
1760   // Redeclarable
1761   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1762   // Decl
1763   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1764   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1765   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1766   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1767   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1768   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1769   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1770   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1771   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1772   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1773   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1774   // NamedDecl
1775   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1776   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1777   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1778   // TypeDecl
1779   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1780   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1781   // TagDecl
1782   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
1783   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
1784   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
1785   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
1786   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
1787   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsCompleteDefinitionRequired
1788   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
1789   Abv->Add(BitCodeAbbrevOp(0));                         // ExtInfoKind
1790   // RecordDecl
1791   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // FlexibleArrayMember
1792   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // AnonymousStructUnion
1793   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasObjectMember
1794   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasVolatileMember
1795   // DC
1796   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
1797   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
1798   DeclRecordAbbrev = Stream.EmitAbbrev(Abv);
1799 
1800   // Abbreviation for DECL_PARM_VAR
1801   Abv = new BitCodeAbbrev();
1802   Abv->Add(BitCodeAbbrevOp(serialization::DECL_PARM_VAR));
1803   // Redeclarable
1804   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1805   // Decl
1806   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1807   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1808   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1809   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1810   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1811   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1812   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1813   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1814   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1815   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1816   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1817   // NamedDecl
1818   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1819   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1820   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1821   // ValueDecl
1822   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1823   // DeclaratorDecl
1824   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1825   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1826   // VarDecl
1827   Abv->Add(BitCodeAbbrevOp(0));                       // StorageClass
1828   Abv->Add(BitCodeAbbrevOp(0));                       // getTSCSpec
1829   Abv->Add(BitCodeAbbrevOp(0));                       // hasCXXDirectInitializer
1830   Abv->Add(BitCodeAbbrevOp(0));                       // Linkage
1831   Abv->Add(BitCodeAbbrevOp(0));                       // HasInit
1832   Abv->Add(BitCodeAbbrevOp(0));                   // HasMemberSpecializationInfo
1833   // ParmVarDecl
1834   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsObjCMethodParameter
1835   Abv->Add(BitCodeAbbrevOp(0));                       // ScopeDepth
1836   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ScopeIndex
1837   Abv->Add(BitCodeAbbrevOp(0));                       // ObjCDeclQualifier
1838   Abv->Add(BitCodeAbbrevOp(0));                       // KNRPromoted
1839   Abv->Add(BitCodeAbbrevOp(0));                       // HasInheritedDefaultArg
1840   Abv->Add(BitCodeAbbrevOp(0));                   // HasUninstantiatedDefaultArg
1841   // Type Source Info
1842   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1843   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1844   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1845   DeclParmVarAbbrev = Stream.EmitAbbrev(Abv);
1846 
1847   // Abbreviation for DECL_TYPEDEF
1848   Abv = new BitCodeAbbrev();
1849   Abv->Add(BitCodeAbbrevOp(serialization::DECL_TYPEDEF));
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(BitCodeAbbrevOp::Fixed, 1)); // isUsed
1859   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isReferenced
1860   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1861   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // 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   // TypeDecl
1869   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
1870   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
1871   // TypedefDecl
1872   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1873   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1874   DeclTypedefAbbrev = Stream.EmitAbbrev(Abv);
1875 
1876   // Abbreviation for DECL_VAR
1877   Abv = new BitCodeAbbrev();
1878   Abv->Add(BitCodeAbbrevOp(serialization::DECL_VAR));
1879   // Redeclarable
1880   Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1881   // Decl
1882   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1883   Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1884   Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1885   Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1886   Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1887   Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1888   Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1889   Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1890   Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1891   Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1892   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1893   // NamedDecl
1894   Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1895   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1896   Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1897   // ValueDecl
1898   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1899   // DeclaratorDecl
1900   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1901   Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1902   // VarDecl
1903   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // StorageClass
1904   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // getTSCSpec
1905   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // CXXDirectInitializer
1906   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isExceptionVariable
1907   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isNRVOVariable
1908   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCXXForRangeDecl
1909   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isARCPseudoStrong
1910   Abv->Add(BitCodeAbbrevOp(0));                         // isConstexpr
1911   Abv->Add(BitCodeAbbrevOp(0));                         // isInitCapture
1912   Abv->Add(BitCodeAbbrevOp(0));                         // isPrevDeclInSameScope
1913   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Linkage
1914   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // HasInit
1915   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // HasMemberSpecInfo
1916   // Type Source Info
1917   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1918   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1919   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1920   DeclVarAbbrev = Stream.EmitAbbrev(Abv);
1921 
1922   // Abbreviation for DECL_CXX_METHOD
1923   Abv = new BitCodeAbbrev();
1924   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CXX_METHOD));
1925   // RedeclarableDecl
1926   Abv->Add(BitCodeAbbrevOp(0));                         // CanonicalDecl
1927   // Decl
1928   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // DeclContext
1929   Abv->Add(BitCodeAbbrevOp(0));                         // LexicalDeclContext
1930   Abv->Add(BitCodeAbbrevOp(0));                         // Invalid
1931   Abv->Add(BitCodeAbbrevOp(0));                         // HasAttrs
1932   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Implicit
1933   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Used
1934   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Referenced
1935   Abv->Add(BitCodeAbbrevOp(0));                         // InObjCContainer
1936   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // Access
1937   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ModulePrivate
1938   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SubmoduleID
1939   // NamedDecl
1940   Abv->Add(BitCodeAbbrevOp(DeclarationName::Identifier)); // NameKind
1941   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // Identifier
1942   Abv->Add(BitCodeAbbrevOp(0));                         // AnonDeclNumber
1943   // ValueDecl
1944   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // Type
1945   // DeclaratorDecl
1946   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // InnerLocStart
1947   Abv->Add(BitCodeAbbrevOp(0));                         // HasExtInfo
1948   // FunctionDecl
1949   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 11)); // IDNS
1950   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // StorageClass
1951   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Inline
1952   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InlineSpecified
1953   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // VirtualAsWritten
1954   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Pure
1955   Abv->Add(BitCodeAbbrevOp(0));                         // HasInheritedProto
1956   Abv->Add(BitCodeAbbrevOp(1));                         // HasWrittenProto
1957   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Deleted
1958   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Trivial
1959   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Defaulted
1960   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ExplicitlyDefaulted
1961   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ImplicitReturnZero
1962   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constexpr
1963   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // SkippedBody
1964   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // LateParsed
1965   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Linkage
1966   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LocEnd
1967   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // TemplateKind
1968   // This Array slurps the rest of the record. Fortunately we want to encode
1969   // (nearly) all the remaining (variable number of) fields in the same way.
1970   //
1971   // This is the function template information if any, then
1972   //         NumParams and Params[] from FunctionDecl, and
1973   //         NumOverriddenMethods, OverriddenMethods[] from CXXMethodDecl.
1974   //
1975   //  Add an AbbrevOp for 'size then elements' and use it here.
1976   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1977   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
1978   DeclCXXMethodAbbrev = Stream.EmitAbbrev(Abv);
1979 
1980   // Abbreviation for EXPR_DECL_REF
1981   Abv = new BitCodeAbbrev();
1982   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_DECL_REF));
1983   //Stmt
1984   //Expr
1985   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1986   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
1987   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
1988   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
1989   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
1990   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
1991   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
1992   //DeclRefExpr
1993   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HasQualifier
1994   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //GetDeclFound
1995   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ExplicitTemplateArgs
1996   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HadMultipleCandidates
1997   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
1998                            1)); // RefersToEnclosingVariableOrCapture
1999   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclRef
2000   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
2001   DeclRefExprAbbrev = Stream.EmitAbbrev(Abv);
2002 
2003   // Abbreviation for EXPR_INTEGER_LITERAL
2004   Abv = new BitCodeAbbrev();
2005   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_INTEGER_LITERAL));
2006   //Stmt
2007   //Expr
2008   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2009   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2010   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2011   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2012   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2013   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2014   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2015   //Integer Literal
2016   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
2017   Abv->Add(BitCodeAbbrevOp(32));                      // Bit Width
2018   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Value
2019   IntegerLiteralAbbrev = Stream.EmitAbbrev(Abv);
2020 
2021   // Abbreviation for EXPR_CHARACTER_LITERAL
2022   Abv = new BitCodeAbbrev();
2023   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_CHARACTER_LITERAL));
2024   //Stmt
2025   //Expr
2026   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2027   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2028   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2029   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2030   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2031   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2032   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2033   //Character Literal
2034   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getValue
2035   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
2036   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // getKind
2037   CharacterLiteralAbbrev = Stream.EmitAbbrev(Abv);
2038 
2039   // Abbreviation for EXPR_IMPLICIT_CAST
2040   Abv = new BitCodeAbbrev();
2041   Abv->Add(BitCodeAbbrevOp(serialization::EXPR_IMPLICIT_CAST));
2042   // Stmt
2043   // Expr
2044   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2045   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2046   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2047   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2048   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2049   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2050   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2051   // CastExpr
2052   Abv->Add(BitCodeAbbrevOp(0)); // PathSize
2053   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 6)); // CastKind
2054   // ImplicitCastExpr
2055   ExprImplicitCastAbbrev = Stream.EmitAbbrev(Abv);
2056 
2057   Abv = new BitCodeAbbrev();
2058   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_LEXICAL));
2059   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2060   DeclContextLexicalAbbrev = Stream.EmitAbbrev(Abv);
2061 
2062   Abv = new BitCodeAbbrev();
2063   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_VISIBLE));
2064   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2065   DeclContextVisibleLookupAbbrev = Stream.EmitAbbrev(Abv);
2066 }
2067 
2068 /// isRequiredDecl - Check if this is a "required" Decl, which must be seen by
2069 /// consumers of the AST.
2070 ///
2071 /// Such decls will always be deserialized from the AST file, so we would like
2072 /// this to be as restrictive as possible. Currently the predicate is driven by
2073 /// code generation requirements, if other clients have a different notion of
2074 /// what is "required" then we may have to consider an alternate scheme where
2075 /// clients can iterate over the top-level decls and get information on them,
2076 /// without necessary deserializing them. We could explicitly require such
2077 /// clients to use a separate API call to "realize" the decl. This should be
2078 /// relatively painless since they would presumably only do it for top-level
2079 /// decls.
isRequiredDecl(const Decl * D,ASTContext & Context,bool WritingModule)2080 static bool isRequiredDecl(const Decl *D, ASTContext &Context,
2081                            bool WritingModule) {
2082   // An ObjCMethodDecl is never considered as "required" because its
2083   // implementation container always is.
2084 
2085   // File scoped assembly or obj-c implementation must be seen.
2086   if (isa<FileScopeAsmDecl>(D) || isa<ObjCImplDecl>(D))
2087     return true;
2088 
2089   // ImportDecl is used by codegen to determine the set of imported modules to
2090   // search for inputs for automatic linking; include it if it has a semantic
2091   // effect.
2092   if (isa<ImportDecl>(D) && !WritingModule)
2093     return true;
2094 
2095   return Context.DeclMustBeEmitted(D);
2096 }
2097 
WriteDecl(ASTContext & Context,Decl * D)2098 void ASTWriter::WriteDecl(ASTContext &Context, Decl *D) {
2099   // Switch case IDs are per Decl.
2100   ClearSwitchCaseIDs();
2101 
2102   RecordData Record;
2103   ASTDeclWriter W(*this, Context, Record);
2104 
2105   // Determine the ID for this declaration.
2106   serialization::DeclID ID;
2107   assert(!D->isFromASTFile() && "should not be emitting imported decl");
2108   serialization::DeclID &IDR = DeclIDs[D];
2109   if (IDR == 0)
2110     IDR = NextDeclID++;
2111 
2112   ID = IDR;
2113 
2114   bool isReplacingADecl = ID < FirstDeclID;
2115 
2116   // If this declaration is also a DeclContext, write blocks for the
2117   // declarations that lexically stored inside its context and those
2118   // declarations that are visible from its context. These blocks
2119   // are written before the declaration itself so that we can put
2120   // their offsets into the record for the declaration.
2121   uint64_t LexicalOffset = 0;
2122   uint64_t VisibleOffset = 0;
2123   DeclContext *DC = dyn_cast<DeclContext>(D);
2124   if (DC) {
2125     if (isReplacingADecl) {
2126       // It is replacing a decl from a chained PCH; make sure that the
2127       // DeclContext is fully loaded.
2128       if (DC->hasExternalLexicalStorage())
2129         DC->LoadLexicalDeclsFromExternalStorage();
2130       if (DC->hasExternalVisibleStorage())
2131         Chain->completeVisibleDeclsMap(DC);
2132     }
2133     LexicalOffset = WriteDeclContextLexicalBlock(Context, DC);
2134     VisibleOffset = WriteDeclContextVisibleBlock(Context, DC);
2135   }
2136 
2137   // Build a record for this declaration
2138   Record.clear();
2139   W.Code = (serialization::DeclCode)0;
2140   W.AbbrevToUse = 0;
2141   W.Visit(D);
2142   if (DC) W.VisitDeclContext(DC, LexicalOffset, VisibleOffset);
2143 
2144   if (isReplacingADecl) {
2145     // We're replacing a decl in a previous file.
2146     ReplacedDecls.push_back(ReplacedDeclInfo(ID, Stream.GetCurrentBitNo(),
2147                                              D->getLocation()));
2148   } else {
2149     unsigned Index = ID - FirstDeclID;
2150 
2151     // Record the offset for this declaration
2152     SourceLocation Loc = D->getLocation();
2153     if (DeclOffsets.size() == Index)
2154       DeclOffsets.push_back(DeclOffset(Loc, Stream.GetCurrentBitNo()));
2155     else if (DeclOffsets.size() < Index) {
2156       DeclOffsets.resize(Index+1);
2157       DeclOffsets[Index].setLocation(Loc);
2158       DeclOffsets[Index].BitOffset = Stream.GetCurrentBitNo();
2159     }
2160 
2161     SourceManager &SM = Context.getSourceManager();
2162     if (Loc.isValid() && SM.isLocalSourceLocation(Loc))
2163       associateDeclWithFile(D, ID);
2164   }
2165 
2166   if (!W.Code)
2167     llvm::report_fatal_error(StringRef("unexpected declaration kind '") +
2168                             D->getDeclKindName() + "'");
2169   Stream.EmitRecord(W.Code, Record, W.AbbrevToUse);
2170 
2171   // Flush any expressions, base specifiers, and ctor initializers that
2172   // were written as part of this declaration.
2173   FlushPendingAfterDecl();
2174 
2175   // Note declarations that should be deserialized eagerly so that we can add
2176   // them to a record in the AST file later.
2177   if (isRequiredDecl(D, Context, WritingModule))
2178     EagerlyDeserializedDecls.push_back(ID);
2179 }
2180 
AddFunctionDefinition(const FunctionDecl * FD,RecordData & Record)2181 void ASTWriter::AddFunctionDefinition(const FunctionDecl *FD,
2182                                       RecordData &Record) {
2183   ClearSwitchCaseIDs();
2184 
2185   ASTDeclWriter W(*this, FD->getASTContext(), Record);
2186   W.AddFunctionDefinition(FD);
2187 }
2188