1//===--- ASTWriterDecl.cpp - Declaration Serialization --------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9//  This file implements serialization for Declarations.
10//
11//===----------------------------------------------------------------------===//
12
13#include "ASTCommon.h"
14#include "clang/AST/Attr.h"
15#include "clang/AST/DeclCXX.h"
16#include "clang/AST/DeclContextInternals.h"
17#include "clang/AST/DeclTemplate.h"
18#include "clang/AST/DeclVisitor.h"
19#include "clang/AST/Expr.h"
20#include "clang/AST/OpenMPClause.h"
21#include "clang/AST/PrettyDeclStackTrace.h"
22#include "clang/Basic/SourceManager.h"
23#include "clang/Serialization/ASTReader.h"
24#include "clang/Serialization/ASTRecordWriter.h"
25#include "llvm/Bitstream/BitstreamWriter.h"
26#include "llvm/Support/ErrorHandling.h"
27using namespace clang;
28using namespace serialization;
29
30//===----------------------------------------------------------------------===//
31// Declaration serialization
32//===----------------------------------------------------------------------===//
33
34namespace clang {
35  class ASTDeclWriter : public DeclVisitor<ASTDeclWriter, void> {
36    ASTWriter &Writer;
37    ASTContext &Context;
38    ASTRecordWriter Record;
39
40    serialization::DeclCode Code;
41    unsigned AbbrevToUse;
42
43  public:
44    ASTDeclWriter(ASTWriter &Writer, ASTContext &Context,
45                  ASTWriter::RecordDataImpl &Record)
46        : Writer(Writer), Context(Context), Record(Writer, Record),
47          Code((serialization::DeclCode)0), AbbrevToUse(0) {}
48
49    uint64_t Emit(Decl *D) {
50      if (!Code)
51        llvm::report_fatal_error(StringRef("unexpected declaration kind '") +
52            D->getDeclKindName() + "'");
53      return Record.Emit(Code, AbbrevToUse);
54    }
55
56    void Visit(Decl *D);
57
58    void VisitDecl(Decl *D);
59    void VisitPragmaCommentDecl(PragmaCommentDecl *D);
60    void VisitPragmaDetectMismatchDecl(PragmaDetectMismatchDecl *D);
61    void VisitTranslationUnitDecl(TranslationUnitDecl *D);
62    void VisitNamedDecl(NamedDecl *D);
63    void VisitLabelDecl(LabelDecl *LD);
64    void VisitNamespaceDecl(NamespaceDecl *D);
65    void VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
66    void VisitNamespaceAliasDecl(NamespaceAliasDecl *D);
67    void VisitTypeDecl(TypeDecl *D);
68    void VisitTypedefNameDecl(TypedefNameDecl *D);
69    void VisitTypedefDecl(TypedefDecl *D);
70    void VisitTypeAliasDecl(TypeAliasDecl *D);
71    void VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
72    void VisitTagDecl(TagDecl *D);
73    void VisitEnumDecl(EnumDecl *D);
74    void VisitRecordDecl(RecordDecl *D);
75    void VisitCXXRecordDecl(CXXRecordDecl *D);
76    void VisitClassTemplateSpecializationDecl(
77                                            ClassTemplateSpecializationDecl *D);
78    void VisitClassTemplatePartialSpecializationDecl(
79                                     ClassTemplatePartialSpecializationDecl *D);
80    void VisitVarTemplateSpecializationDecl(VarTemplateSpecializationDecl *D);
81    void VisitVarTemplatePartialSpecializationDecl(
82        VarTemplatePartialSpecializationDecl *D);
83    void VisitClassScopeFunctionSpecializationDecl(
84                                       ClassScopeFunctionSpecializationDecl *D);
85    void VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D);
86    void VisitValueDecl(ValueDecl *D);
87    void VisitEnumConstantDecl(EnumConstantDecl *D);
88    void VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
89    void VisitDeclaratorDecl(DeclaratorDecl *D);
90    void VisitFunctionDecl(FunctionDecl *D);
91    void VisitCXXDeductionGuideDecl(CXXDeductionGuideDecl *D);
92    void VisitCXXMethodDecl(CXXMethodDecl *D);
93    void VisitCXXConstructorDecl(CXXConstructorDecl *D);
94    void VisitCXXDestructorDecl(CXXDestructorDecl *D);
95    void VisitCXXConversionDecl(CXXConversionDecl *D);
96    void VisitFieldDecl(FieldDecl *D);
97    void VisitMSPropertyDecl(MSPropertyDecl *D);
98    void VisitMSGuidDecl(MSGuidDecl *D);
99    void VisitIndirectFieldDecl(IndirectFieldDecl *D);
100    void VisitVarDecl(VarDecl *D);
101    void VisitImplicitParamDecl(ImplicitParamDecl *D);
102    void VisitParmVarDecl(ParmVarDecl *D);
103    void VisitDecompositionDecl(DecompositionDecl *D);
104    void VisitBindingDecl(BindingDecl *D);
105    void VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D);
106    void VisitTemplateDecl(TemplateDecl *D);
107    void VisitConceptDecl(ConceptDecl *D);
108    void VisitRequiresExprBodyDecl(RequiresExprBodyDecl *D);
109    void VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D);
110    void VisitClassTemplateDecl(ClassTemplateDecl *D);
111    void VisitVarTemplateDecl(VarTemplateDecl *D);
112    void VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
113    void VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D);
114    void VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D);
115    void VisitUsingDecl(UsingDecl *D);
116    void VisitUsingPackDecl(UsingPackDecl *D);
117    void VisitUsingShadowDecl(UsingShadowDecl *D);
118    void VisitConstructorUsingShadowDecl(ConstructorUsingShadowDecl *D);
119    void VisitLinkageSpecDecl(LinkageSpecDecl *D);
120    void VisitExportDecl(ExportDecl *D);
121    void VisitFileScopeAsmDecl(FileScopeAsmDecl *D);
122    void VisitImportDecl(ImportDecl *D);
123    void VisitAccessSpecDecl(AccessSpecDecl *D);
124    void VisitFriendDecl(FriendDecl *D);
125    void VisitFriendTemplateDecl(FriendTemplateDecl *D);
126    void VisitStaticAssertDecl(StaticAssertDecl *D);
127    void VisitBlockDecl(BlockDecl *D);
128    void VisitCapturedDecl(CapturedDecl *D);
129    void VisitEmptyDecl(EmptyDecl *D);
130    void VisitLifetimeExtendedTemporaryDecl(LifetimeExtendedTemporaryDecl *D);
131
132    void VisitDeclContext(DeclContext *DC);
133    template <typename T> void VisitRedeclarable(Redeclarable<T> *D);
134
135
136    // FIXME: Put in the same order is DeclNodes.td?
137    void VisitObjCMethodDecl(ObjCMethodDecl *D);
138    void VisitObjCTypeParamDecl(ObjCTypeParamDecl *D);
139    void VisitObjCContainerDecl(ObjCContainerDecl *D);
140    void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
141    void VisitObjCIvarDecl(ObjCIvarDecl *D);
142    void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
143    void VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D);
144    void VisitObjCCategoryDecl(ObjCCategoryDecl *D);
145    void VisitObjCImplDecl(ObjCImplDecl *D);
146    void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
147    void VisitObjCImplementationDecl(ObjCImplementationDecl *D);
148    void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D);
149    void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
150    void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
151    void VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D);
152    void VisitOMPAllocateDecl(OMPAllocateDecl *D);
153    void VisitOMPRequiresDecl(OMPRequiresDecl *D);
154    void VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D);
155    void VisitOMPDeclareMapperDecl(OMPDeclareMapperDecl *D);
156    void VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D);
157
158    /// Add an Objective-C type parameter list to the given record.
159    void AddObjCTypeParamList(ObjCTypeParamList *typeParams) {
160      // Empty type parameter list.
161      if (!typeParams) {
162        Record.push_back(0);
163        return;
164      }
165
166      Record.push_back(typeParams->size());
167      for (auto typeParam : *typeParams) {
168        Record.AddDeclRef(typeParam);
169      }
170      Record.AddSourceLocation(typeParams->getLAngleLoc());
171      Record.AddSourceLocation(typeParams->getRAngleLoc());
172    }
173
174    /// Add to the record the first declaration from each module file that
175    /// provides a declaration of D. The intent is to provide a sufficient
176    /// set such that reloading this set will load all current redeclarations.
177    void AddFirstDeclFromEachModule(const Decl *D, bool IncludeLocal) {
178      llvm::MapVector<ModuleFile*, const Decl*> Firsts;
179      // FIXME: We can skip entries that we know are implied by others.
180      for (const Decl *R = D->getMostRecentDecl(); R; R = R->getPreviousDecl()) {
181        if (R->isFromASTFile())
182          Firsts[Writer.Chain->getOwningModuleFile(R)] = R;
183        else if (IncludeLocal)
184          Firsts[nullptr] = R;
185      }
186      for (const auto &F : Firsts)
187        Record.AddDeclRef(F.second);
188    }
189
190    /// Get the specialization decl from an entry in the specialization list.
191    template <typename EntryType>
192    typename RedeclarableTemplateDecl::SpecEntryTraits<EntryType>::DeclType *
193    getSpecializationDecl(EntryType &T) {
194      return RedeclarableTemplateDecl::SpecEntryTraits<EntryType>::getDecl(&T);
195    }
196
197    /// Get the list of partial specializations from a template's common ptr.
198    template<typename T>
199    decltype(T::PartialSpecializations) &getPartialSpecializations(T *Common) {
200      return Common->PartialSpecializations;
201    }
202    ArrayRef<Decl> getPartialSpecializations(FunctionTemplateDecl::Common *) {
203      return None;
204    }
205
206    template<typename DeclTy>
207    void AddTemplateSpecializations(DeclTy *D) {
208      auto *Common = D->getCommonPtr();
209
210      // If we have any lazy specializations, and the external AST source is
211      // our chained AST reader, we can just write out the DeclIDs. Otherwise,
212      // we need to resolve them to actual declarations.
213      if (Writer.Chain != Writer.Context->getExternalSource() &&
214          Common->LazySpecializations) {
215        D->LoadLazySpecializations();
216        assert(!Common->LazySpecializations);
217      }
218
219      ArrayRef<DeclID> LazySpecializations;
220      if (auto *LS = Common->LazySpecializations)
221        LazySpecializations = llvm::makeArrayRef(LS + 1, LS[0]);
222
223      // Add a slot to the record for the number of specializations.
224      unsigned I = Record.size();
225      Record.push_back(0);
226
227      // AddFirstDeclFromEachModule might trigger deserialization, invalidating
228      // *Specializations iterators.
229      llvm::SmallVector<const Decl*, 16> Specs;
230      for (auto &Entry : Common->Specializations)
231        Specs.push_back(getSpecializationDecl(Entry));
232      for (auto &Entry : getPartialSpecializations(Common))
233        Specs.push_back(getSpecializationDecl(Entry));
234
235      for (auto *D : Specs) {
236        assert(D->isCanonicalDecl() && "non-canonical decl in set");
237        AddFirstDeclFromEachModule(D, /*IncludeLocal*/true);
238      }
239      Record.append(LazySpecializations.begin(), LazySpecializations.end());
240
241      // Update the size entry we added earlier.
242      Record[I] = Record.size() - I - 1;
243    }
244
245    /// Ensure that this template specialization is associated with the specified
246    /// template on reload.
247    void RegisterTemplateSpecialization(const Decl *Template,
248                                        const Decl *Specialization) {
249      Template = Template->getCanonicalDecl();
250
251      // If the canonical template is local, we'll write out this specialization
252      // when we emit it.
253      // FIXME: We can do the same thing if there is any local declaration of
254      // the template, to avoid emitting an update record.
255      if (!Template->isFromASTFile())
256        return;
257
258      // We only need to associate the first local declaration of the
259      // specialization. The other declarations will get pulled in by it.
260      if (Writer.getFirstLocalDecl(Specialization) != Specialization)
261        return;
262
263      Writer.DeclUpdates[Template].push_back(ASTWriter::DeclUpdate(
264          UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION, Specialization));
265    }
266  };
267}
268
269void ASTDeclWriter::Visit(Decl *D) {
270  DeclVisitor<ASTDeclWriter>::Visit(D);
271
272  // Source locations require array (variable-length) abbreviations.  The
273  // abbreviation infrastructure requires that arrays are encoded last, so
274  // we handle it here in the case of those classes derived from DeclaratorDecl
275  if (DeclaratorDecl *DD = dyn_cast<DeclaratorDecl>(D)) {
276    if (auto *TInfo = DD->getTypeSourceInfo())
277      Record.AddTypeLoc(TInfo->getTypeLoc());
278  }
279
280  // Handle FunctionDecl's body here and write it after all other Stmts/Exprs
281  // have been written. We want it last because we will not read it back when
282  // retrieving it from the AST, we'll just lazily set the offset.
283  if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) {
284    Record.push_back(FD->doesThisDeclarationHaveABody());
285    if (FD->doesThisDeclarationHaveABody())
286      Record.AddFunctionDefinition(FD);
287  }
288
289  // If this declaration is also a DeclContext, write blocks for the
290  // declarations that lexically stored inside its context and those
291  // declarations that are visible from its context.
292  if (DeclContext *DC = dyn_cast<DeclContext>(D))
293    VisitDeclContext(DC);
294}
295
296void ASTDeclWriter::VisitDecl(Decl *D) {
297  Record.AddDeclRef(cast_or_null<Decl>(D->getDeclContext()));
298  if (D->getDeclContext() != D->getLexicalDeclContext())
299    Record.AddDeclRef(cast_or_null<Decl>(D->getLexicalDeclContext()));
300  else
301    Record.push_back(0);
302  Record.push_back(D->isInvalidDecl());
303  Record.push_back(D->hasAttrs());
304  if (D->hasAttrs())
305    Record.AddAttributes(D->getAttrs());
306  Record.push_back(D->isImplicit());
307  Record.push_back(D->isUsed(false));
308  Record.push_back(D->isReferenced());
309  Record.push_back(D->isTopLevelDeclInObjCContainer());
310  Record.push_back(D->getAccess());
311  Record.push_back(D->isModulePrivate());
312  Record.push_back(Writer.getSubmoduleID(D->getOwningModule()));
313
314  // If this declaration injected a name into a context different from its
315  // lexical context, and that context is an imported namespace, we need to
316  // update its visible declarations to include this name.
317  //
318  // This happens when we instantiate a class with a friend declaration or a
319  // function with a local extern declaration, for instance.
320  //
321  // FIXME: Can we handle this in AddedVisibleDecl instead?
322  if (D->isOutOfLine()) {
323    auto *DC = D->getDeclContext();
324    while (auto *NS = dyn_cast<NamespaceDecl>(DC->getRedeclContext())) {
325      if (!NS->isFromASTFile())
326        break;
327      Writer.UpdatedDeclContexts.insert(NS->getPrimaryContext());
328      if (!NS->isInlineNamespace())
329        break;
330      DC = NS->getParent();
331    }
332  }
333}
334
335void ASTDeclWriter::VisitPragmaCommentDecl(PragmaCommentDecl *D) {
336  StringRef Arg = D->getArg();
337  Record.push_back(Arg.size());
338  VisitDecl(D);
339  Record.AddSourceLocation(D->getBeginLoc());
340  Record.push_back(D->getCommentKind());
341  Record.AddString(Arg);
342  Code = serialization::DECL_PRAGMA_COMMENT;
343}
344
345void ASTDeclWriter::VisitPragmaDetectMismatchDecl(
346    PragmaDetectMismatchDecl *D) {
347  StringRef Name = D->getName();
348  StringRef Value = D->getValue();
349  Record.push_back(Name.size() + 1 + Value.size());
350  VisitDecl(D);
351  Record.AddSourceLocation(D->getBeginLoc());
352  Record.AddString(Name);
353  Record.AddString(Value);
354  Code = serialization::DECL_PRAGMA_DETECT_MISMATCH;
355}
356
357void ASTDeclWriter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
358  llvm_unreachable("Translation units aren't directly serialized");
359}
360
361void ASTDeclWriter::VisitNamedDecl(NamedDecl *D) {
362  VisitDecl(D);
363  Record.AddDeclarationName(D->getDeclName());
364  Record.push_back(needsAnonymousDeclarationNumber(D)
365                       ? Writer.getAnonymousDeclarationNumber(D)
366                       : 0);
367}
368
369void ASTDeclWriter::VisitTypeDecl(TypeDecl *D) {
370  VisitNamedDecl(D);
371  Record.AddSourceLocation(D->getBeginLoc());
372  Record.AddTypeRef(QualType(D->getTypeForDecl(), 0));
373}
374
375void ASTDeclWriter::VisitTypedefNameDecl(TypedefNameDecl *D) {
376  VisitRedeclarable(D);
377  VisitTypeDecl(D);
378  Record.AddTypeSourceInfo(D->getTypeSourceInfo());
379  Record.push_back(D->isModed());
380  if (D->isModed())
381    Record.AddTypeRef(D->getUnderlyingType());
382  Record.AddDeclRef(D->getAnonDeclWithTypedefName(false));
383}
384
385void ASTDeclWriter::VisitTypedefDecl(TypedefDecl *D) {
386  VisitTypedefNameDecl(D);
387  if (D->getDeclContext() == D->getLexicalDeclContext() &&
388      !D->hasAttrs() &&
389      !D->isImplicit() &&
390      D->getFirstDecl() == D->getMostRecentDecl() &&
391      !D->isInvalidDecl() &&
392      !D->isTopLevelDeclInObjCContainer() &&
393      !D->isModulePrivate() &&
394      !needsAnonymousDeclarationNumber(D) &&
395      D->getDeclName().getNameKind() == DeclarationName::Identifier)
396    AbbrevToUse = Writer.getDeclTypedefAbbrev();
397
398  Code = serialization::DECL_TYPEDEF;
399}
400
401void ASTDeclWriter::VisitTypeAliasDecl(TypeAliasDecl *D) {
402  VisitTypedefNameDecl(D);
403  Record.AddDeclRef(D->getDescribedAliasTemplate());
404  Code = serialization::DECL_TYPEALIAS;
405}
406
407void ASTDeclWriter::VisitTagDecl(TagDecl *D) {
408  VisitRedeclarable(D);
409  VisitTypeDecl(D);
410  Record.push_back(D->getIdentifierNamespace());
411  Record.push_back((unsigned)D->getTagKind()); // FIXME: stable encoding
412  if (!isa<CXXRecordDecl>(D))
413    Record.push_back(D->isCompleteDefinition());
414  Record.push_back(D->isEmbeddedInDeclarator());
415  Record.push_back(D->isFreeStanding());
416  Record.push_back(D->isCompleteDefinitionRequired());
417  Record.AddSourceRange(D->getBraceRange());
418
419  if (D->hasExtInfo()) {
420    Record.push_back(1);
421    Record.AddQualifierInfo(*D->getExtInfo());
422  } else if (auto *TD = D->getTypedefNameForAnonDecl()) {
423    Record.push_back(2);
424    Record.AddDeclRef(TD);
425    Record.AddIdentifierRef(TD->getDeclName().getAsIdentifierInfo());
426  } else {
427    Record.push_back(0);
428  }
429}
430
431void ASTDeclWriter::VisitEnumDecl(EnumDecl *D) {
432  VisitTagDecl(D);
433  Record.AddTypeSourceInfo(D->getIntegerTypeSourceInfo());
434  if (!D->getIntegerTypeSourceInfo())
435    Record.AddTypeRef(D->getIntegerType());
436  Record.AddTypeRef(D->getPromotionType());
437  Record.push_back(D->getNumPositiveBits());
438  Record.push_back(D->getNumNegativeBits());
439  Record.push_back(D->isScoped());
440  Record.push_back(D->isScopedUsingClassTag());
441  Record.push_back(D->isFixed());
442  Record.push_back(D->getODRHash());
443
444  if (MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo()) {
445    Record.AddDeclRef(MemberInfo->getInstantiatedFrom());
446    Record.push_back(MemberInfo->getTemplateSpecializationKind());
447    Record.AddSourceLocation(MemberInfo->getPointOfInstantiation());
448  } else {
449    Record.AddDeclRef(nullptr);
450  }
451
452  if (D->getDeclContext() == D->getLexicalDeclContext() &&
453      !D->hasAttrs() &&
454      !D->isImplicit() &&
455      !D->isUsed(false) &&
456      !D->hasExtInfo() &&
457      !D->getTypedefNameForAnonDecl() &&
458      D->getFirstDecl() == D->getMostRecentDecl() &&
459      !D->isInvalidDecl() &&
460      !D->isReferenced() &&
461      !D->isTopLevelDeclInObjCContainer() &&
462      D->getAccess() == AS_none &&
463      !D->isModulePrivate() &&
464      !CXXRecordDecl::classofKind(D->getKind()) &&
465      !D->getIntegerTypeSourceInfo() &&
466      !D->getMemberSpecializationInfo() &&
467      !needsAnonymousDeclarationNumber(D) &&
468      D->getDeclName().getNameKind() == DeclarationName::Identifier)
469    AbbrevToUse = Writer.getDeclEnumAbbrev();
470
471  Code = serialization::DECL_ENUM;
472}
473
474void ASTDeclWriter::VisitRecordDecl(RecordDecl *D) {
475  VisitTagDecl(D);
476  Record.push_back(D->hasFlexibleArrayMember());
477  Record.push_back(D->isAnonymousStructOrUnion());
478  Record.push_back(D->hasObjectMember());
479  Record.push_back(D->hasVolatileMember());
480  Record.push_back(D->isNonTrivialToPrimitiveDefaultInitialize());
481  Record.push_back(D->isNonTrivialToPrimitiveCopy());
482  Record.push_back(D->isNonTrivialToPrimitiveDestroy());
483  Record.push_back(D->hasNonTrivialToPrimitiveDefaultInitializeCUnion());
484  Record.push_back(D->hasNonTrivialToPrimitiveDestructCUnion());
485  Record.push_back(D->hasNonTrivialToPrimitiveCopyCUnion());
486  Record.push_back(D->isParamDestroyedInCallee());
487  Record.push_back(D->getArgPassingRestrictions());
488
489  if (D->getDeclContext() == D->getLexicalDeclContext() &&
490      !D->hasAttrs() &&
491      !D->isImplicit() &&
492      !D->isUsed(false) &&
493      !D->hasExtInfo() &&
494      !D->getTypedefNameForAnonDecl() &&
495      D->getFirstDecl() == D->getMostRecentDecl() &&
496      !D->isInvalidDecl() &&
497      !D->isReferenced() &&
498      !D->isTopLevelDeclInObjCContainer() &&
499      D->getAccess() == AS_none &&
500      !D->isModulePrivate() &&
501      !CXXRecordDecl::classofKind(D->getKind()) &&
502      !needsAnonymousDeclarationNumber(D) &&
503      D->getDeclName().getNameKind() == DeclarationName::Identifier)
504    AbbrevToUse = Writer.getDeclRecordAbbrev();
505
506  Code = serialization::DECL_RECORD;
507}
508
509void ASTDeclWriter::VisitValueDecl(ValueDecl *D) {
510  VisitNamedDecl(D);
511  Record.AddTypeRef(D->getType());
512}
513
514void ASTDeclWriter::VisitEnumConstantDecl(EnumConstantDecl *D) {
515  VisitValueDecl(D);
516  Record.push_back(D->getInitExpr()? 1 : 0);
517  if (D->getInitExpr())
518    Record.AddStmt(D->getInitExpr());
519  Record.AddAPSInt(D->getInitVal());
520
521  Code = serialization::DECL_ENUM_CONSTANT;
522}
523
524void ASTDeclWriter::VisitDeclaratorDecl(DeclaratorDecl *D) {
525  VisitValueDecl(D);
526  Record.AddSourceLocation(D->getInnerLocStart());
527  Record.push_back(D->hasExtInfo());
528  if (D->hasExtInfo()) {
529    DeclaratorDecl::ExtInfo *Info = D->getExtInfo();
530    Record.AddQualifierInfo(*Info);
531    Record.AddStmt(Info->TrailingRequiresClause);
532  }
533  // The location information is deferred until the end of the record.
534  Record.AddTypeRef(D->getTypeSourceInfo() ? D->getTypeSourceInfo()->getType()
535                                           : QualType());
536}
537
538void ASTDeclWriter::VisitFunctionDecl(FunctionDecl *D) {
539  VisitRedeclarable(D);
540  VisitDeclaratorDecl(D);
541  Record.AddDeclarationNameLoc(D->DNLoc, D->getDeclName());
542  Record.push_back(D->getIdentifierNamespace());
543
544  // FunctionDecl's body is handled last at ASTWriterDecl::Visit,
545  // after everything else is written.
546  Record.push_back(static_cast<int>(D->getStorageClass())); // FIXME: stable encoding
547  Record.push_back(D->isInlineSpecified());
548  Record.push_back(D->isInlined());
549  Record.push_back(D->isVirtualAsWritten());
550  Record.push_back(D->isPure());
551  Record.push_back(D->hasInheritedPrototype());
552  Record.push_back(D->hasWrittenPrototype());
553  Record.push_back(D->isDeletedBit());
554  Record.push_back(D->isTrivial());
555  Record.push_back(D->isTrivialForCall());
556  Record.push_back(D->isDefaulted());
557  Record.push_back(D->isExplicitlyDefaulted());
558  Record.push_back(D->hasImplicitReturnZero());
559  Record.push_back(D->getConstexprKind());
560  Record.push_back(D->usesSEHTry());
561  Record.push_back(D->hasSkippedBody());
562  Record.push_back(D->isMultiVersion());
563  Record.push_back(D->isLateTemplateParsed());
564  Record.push_back(D->getLinkageInternal());
565  Record.AddSourceLocation(D->getEndLoc());
566
567  Record.push_back(D->getODRHash());
568  Record.push_back(D->usesFPIntrin());
569
570  if (D->isDefaulted()) {
571    if (auto *FDI = D->getDefaultedFunctionInfo()) {
572      Record.push_back(FDI->getUnqualifiedLookups().size());
573      for (DeclAccessPair P : FDI->getUnqualifiedLookups()) {
574        Record.AddDeclRef(P.getDecl());
575        Record.push_back(P.getAccess());
576      }
577    } else {
578      Record.push_back(0);
579    }
580  }
581
582  Record.push_back(D->getTemplatedKind());
583  switch (D->getTemplatedKind()) {
584  case FunctionDecl::TK_NonTemplate:
585    break;
586  case FunctionDecl::TK_FunctionTemplate:
587    Record.AddDeclRef(D->getDescribedFunctionTemplate());
588    break;
589  case FunctionDecl::TK_MemberSpecialization: {
590    MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo();
591    Record.AddDeclRef(MemberInfo->getInstantiatedFrom());
592    Record.push_back(MemberInfo->getTemplateSpecializationKind());
593    Record.AddSourceLocation(MemberInfo->getPointOfInstantiation());
594    break;
595  }
596  case FunctionDecl::TK_FunctionTemplateSpecialization: {
597    FunctionTemplateSpecializationInfo *
598      FTSInfo = D->getTemplateSpecializationInfo();
599
600    RegisterTemplateSpecialization(FTSInfo->getTemplate(), D);
601
602    Record.AddDeclRef(FTSInfo->getTemplate());
603    Record.push_back(FTSInfo->getTemplateSpecializationKind());
604
605    // Template arguments.
606    Record.AddTemplateArgumentList(FTSInfo->TemplateArguments);
607
608    // Template args as written.
609    Record.push_back(FTSInfo->TemplateArgumentsAsWritten != nullptr);
610    if (FTSInfo->TemplateArgumentsAsWritten) {
611      Record.push_back(FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs);
612      for (int i=0, e = FTSInfo->TemplateArgumentsAsWritten->NumTemplateArgs;
613             i!=e; ++i)
614        Record.AddTemplateArgumentLoc(
615            (*FTSInfo->TemplateArgumentsAsWritten)[i]);
616      Record.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->LAngleLoc);
617      Record.AddSourceLocation(FTSInfo->TemplateArgumentsAsWritten->RAngleLoc);
618    }
619
620    Record.AddSourceLocation(FTSInfo->getPointOfInstantiation());
621
622    if (MemberSpecializationInfo *MemberInfo =
623        FTSInfo->getMemberSpecializationInfo()) {
624      Record.push_back(1);
625      Record.AddDeclRef(MemberInfo->getInstantiatedFrom());
626      Record.push_back(MemberInfo->getTemplateSpecializationKind());
627      Record.AddSourceLocation(MemberInfo->getPointOfInstantiation());
628    } else {
629      Record.push_back(0);
630    }
631
632    if (D->isCanonicalDecl()) {
633      // Write the template that contains the specializations set. We will
634      // add a FunctionTemplateSpecializationInfo to it when reading.
635      Record.AddDeclRef(FTSInfo->getTemplate()->getCanonicalDecl());
636    }
637    break;
638  }
639  case FunctionDecl::TK_DependentFunctionTemplateSpecialization: {
640    DependentFunctionTemplateSpecializationInfo *
641      DFTSInfo = D->getDependentSpecializationInfo();
642
643    // Templates.
644    Record.push_back(DFTSInfo->getNumTemplates());
645    for (int i=0, e = DFTSInfo->getNumTemplates(); i != e; ++i)
646      Record.AddDeclRef(DFTSInfo->getTemplate(i));
647
648    // Templates args.
649    Record.push_back(DFTSInfo->getNumTemplateArgs());
650    for (int i=0, e = DFTSInfo->getNumTemplateArgs(); i != e; ++i)
651      Record.AddTemplateArgumentLoc(DFTSInfo->getTemplateArg(i));
652    Record.AddSourceLocation(DFTSInfo->getLAngleLoc());
653    Record.AddSourceLocation(DFTSInfo->getRAngleLoc());
654    break;
655  }
656  }
657
658  Record.push_back(D->param_size());
659  for (auto P : D->parameters())
660    Record.AddDeclRef(P);
661  Code = serialization::DECL_FUNCTION;
662}
663
664static void addExplicitSpecifier(ExplicitSpecifier ES,
665                                 ASTRecordWriter &Record) {
666  uint64_t Kind = static_cast<uint64_t>(ES.getKind());
667  Kind = Kind << 1 | static_cast<bool>(ES.getExpr());
668  Record.push_back(Kind);
669  if (ES.getExpr()) {
670    Record.AddStmt(ES.getExpr());
671  }
672}
673
674void ASTDeclWriter::VisitCXXDeductionGuideDecl(CXXDeductionGuideDecl *D) {
675  addExplicitSpecifier(D->getExplicitSpecifier(), Record);
676  VisitFunctionDecl(D);
677  Record.push_back(D->isCopyDeductionCandidate());
678  Code = serialization::DECL_CXX_DEDUCTION_GUIDE;
679}
680
681void ASTDeclWriter::VisitObjCMethodDecl(ObjCMethodDecl *D) {
682  VisitNamedDecl(D);
683  // FIXME: convert to LazyStmtPtr?
684  // Unlike C/C++, method bodies will never be in header files.
685  bool HasBodyStuff = D->getBody() != nullptr;
686  Record.push_back(HasBodyStuff);
687  if (HasBodyStuff) {
688    Record.AddStmt(D->getBody());
689  }
690  Record.AddDeclRef(D->getSelfDecl());
691  Record.AddDeclRef(D->getCmdDecl());
692  Record.push_back(D->isInstanceMethod());
693  Record.push_back(D->isVariadic());
694  Record.push_back(D->isPropertyAccessor());
695  Record.push_back(D->isSynthesizedAccessorStub());
696  Record.push_back(D->isDefined());
697  Record.push_back(D->isOverriding());
698  Record.push_back(D->hasSkippedBody());
699
700  Record.push_back(D->isRedeclaration());
701  Record.push_back(D->hasRedeclaration());
702  if (D->hasRedeclaration()) {
703    assert(Context.getObjCMethodRedeclaration(D));
704    Record.AddDeclRef(Context.getObjCMethodRedeclaration(D));
705  }
706
707  // FIXME: stable encoding for @required/@optional
708  Record.push_back(D->getImplementationControl());
709  // FIXME: stable encoding for in/out/inout/bycopy/byref/oneway/nullability
710  Record.push_back(D->getObjCDeclQualifier());
711  Record.push_back(D->hasRelatedResultType());
712  Record.AddTypeRef(D->getReturnType());
713  Record.AddTypeSourceInfo(D->getReturnTypeSourceInfo());
714  Record.AddSourceLocation(D->getEndLoc());
715  Record.push_back(D->param_size());
716  for (const auto *P : D->parameters())
717    Record.AddDeclRef(P);
718
719  Record.push_back(D->getSelLocsKind());
720  unsigned NumStoredSelLocs = D->getNumStoredSelLocs();
721  SourceLocation *SelLocs = D->getStoredSelLocs();
722  Record.push_back(NumStoredSelLocs);
723  for (unsigned i = 0; i != NumStoredSelLocs; ++i)
724    Record.AddSourceLocation(SelLocs[i]);
725
726  Code = serialization::DECL_OBJC_METHOD;
727}
728
729void ASTDeclWriter::VisitObjCTypeParamDecl(ObjCTypeParamDecl *D) {
730  VisitTypedefNameDecl(D);
731  Record.push_back(D->Variance);
732  Record.push_back(D->Index);
733  Record.AddSourceLocation(D->VarianceLoc);
734  Record.AddSourceLocation(D->ColonLoc);
735
736  Code = serialization::DECL_OBJC_TYPE_PARAM;
737}
738
739void ASTDeclWriter::VisitObjCContainerDecl(ObjCContainerDecl *D) {
740  VisitNamedDecl(D);
741  Record.AddSourceLocation(D->getAtStartLoc());
742  Record.AddSourceRange(D->getAtEndRange());
743  // Abstract class (no need to define a stable serialization::DECL code).
744}
745
746void ASTDeclWriter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *D) {
747  VisitRedeclarable(D);
748  VisitObjCContainerDecl(D);
749  Record.AddTypeRef(QualType(D->getTypeForDecl(), 0));
750  AddObjCTypeParamList(D->TypeParamList);
751
752  Record.push_back(D->isThisDeclarationADefinition());
753  if (D->isThisDeclarationADefinition()) {
754    // Write the DefinitionData
755    ObjCInterfaceDecl::DefinitionData &Data = D->data();
756
757    Record.AddTypeSourceInfo(D->getSuperClassTInfo());
758    Record.AddSourceLocation(D->getEndOfDefinitionLoc());
759    Record.push_back(Data.HasDesignatedInitializers);
760
761    // Write out the protocols that are directly referenced by the @interface.
762    Record.push_back(Data.ReferencedProtocols.size());
763    for (const auto *P : D->protocols())
764      Record.AddDeclRef(P);
765    for (const auto &PL : D->protocol_locs())
766      Record.AddSourceLocation(PL);
767
768    // Write out the protocols that are transitively referenced.
769    Record.push_back(Data.AllReferencedProtocols.size());
770    for (ObjCList<ObjCProtocolDecl>::iterator
771              P = Data.AllReferencedProtocols.begin(),
772           PEnd = Data.AllReferencedProtocols.end();
773         P != PEnd; ++P)
774      Record.AddDeclRef(*P);
775
776
777    if (ObjCCategoryDecl *Cat = D->getCategoryListRaw()) {
778      // Ensure that we write out the set of categories for this class.
779      Writer.ObjCClassesWithCategories.insert(D);
780
781      // Make sure that the categories get serialized.
782      for (; Cat; Cat = Cat->getNextClassCategoryRaw())
783        (void)Writer.GetDeclRef(Cat);
784    }
785  }
786
787  Code = serialization::DECL_OBJC_INTERFACE;
788}
789
790void ASTDeclWriter::VisitObjCIvarDecl(ObjCIvarDecl *D) {
791  VisitFieldDecl(D);
792  // FIXME: stable encoding for @public/@private/@protected/@package
793  Record.push_back(D->getAccessControl());
794  Record.push_back(D->getSynthesize());
795
796  if (D->getDeclContext() == D->getLexicalDeclContext() &&
797      !D->hasAttrs() &&
798      !D->isImplicit() &&
799      !D->isUsed(false) &&
800      !D->isInvalidDecl() &&
801      !D->isReferenced() &&
802      !D->isModulePrivate() &&
803      !D->getBitWidth() &&
804      !D->hasExtInfo() &&
805      D->getDeclName())
806    AbbrevToUse = Writer.getDeclObjCIvarAbbrev();
807
808  Code = serialization::DECL_OBJC_IVAR;
809}
810
811void ASTDeclWriter::VisitObjCProtocolDecl(ObjCProtocolDecl *D) {
812  VisitRedeclarable(D);
813  VisitObjCContainerDecl(D);
814
815  Record.push_back(D->isThisDeclarationADefinition());
816  if (D->isThisDeclarationADefinition()) {
817    Record.push_back(D->protocol_size());
818    for (const auto *I : D->protocols())
819      Record.AddDeclRef(I);
820    for (const auto &PL : D->protocol_locs())
821      Record.AddSourceLocation(PL);
822  }
823
824  Code = serialization::DECL_OBJC_PROTOCOL;
825}
826
827void ASTDeclWriter::VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D) {
828  VisitFieldDecl(D);
829  Code = serialization::DECL_OBJC_AT_DEFS_FIELD;
830}
831
832void ASTDeclWriter::VisitObjCCategoryDecl(ObjCCategoryDecl *D) {
833  VisitObjCContainerDecl(D);
834  Record.AddSourceLocation(D->getCategoryNameLoc());
835  Record.AddSourceLocation(D->getIvarLBraceLoc());
836  Record.AddSourceLocation(D->getIvarRBraceLoc());
837  Record.AddDeclRef(D->getClassInterface());
838  AddObjCTypeParamList(D->TypeParamList);
839  Record.push_back(D->protocol_size());
840  for (const auto *I : D->protocols())
841    Record.AddDeclRef(I);
842  for (const auto &PL : D->protocol_locs())
843    Record.AddSourceLocation(PL);
844  Code = serialization::DECL_OBJC_CATEGORY;
845}
846
847void ASTDeclWriter::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D) {
848  VisitNamedDecl(D);
849  Record.AddDeclRef(D->getClassInterface());
850  Code = serialization::DECL_OBJC_COMPATIBLE_ALIAS;
851}
852
853void ASTDeclWriter::VisitObjCPropertyDecl(ObjCPropertyDecl *D) {
854  VisitNamedDecl(D);
855  Record.AddSourceLocation(D->getAtLoc());
856  Record.AddSourceLocation(D->getLParenLoc());
857  Record.AddTypeRef(D->getType());
858  Record.AddTypeSourceInfo(D->getTypeSourceInfo());
859  // FIXME: stable encoding
860  Record.push_back((unsigned)D->getPropertyAttributes());
861  Record.push_back((unsigned)D->getPropertyAttributesAsWritten());
862  // FIXME: stable encoding
863  Record.push_back((unsigned)D->getPropertyImplementation());
864  Record.AddDeclarationName(D->getGetterName());
865  Record.AddSourceLocation(D->getGetterNameLoc());
866  Record.AddDeclarationName(D->getSetterName());
867  Record.AddSourceLocation(D->getSetterNameLoc());
868  Record.AddDeclRef(D->getGetterMethodDecl());
869  Record.AddDeclRef(D->getSetterMethodDecl());
870  Record.AddDeclRef(D->getPropertyIvarDecl());
871  Code = serialization::DECL_OBJC_PROPERTY;
872}
873
874void ASTDeclWriter::VisitObjCImplDecl(ObjCImplDecl *D) {
875  VisitObjCContainerDecl(D);
876  Record.AddDeclRef(D->getClassInterface());
877  // Abstract class (no need to define a stable serialization::DECL code).
878}
879
880void ASTDeclWriter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D) {
881  VisitObjCImplDecl(D);
882  Record.AddSourceLocation(D->getCategoryNameLoc());
883  Code = serialization::DECL_OBJC_CATEGORY_IMPL;
884}
885
886void ASTDeclWriter::VisitObjCImplementationDecl(ObjCImplementationDecl *D) {
887  VisitObjCImplDecl(D);
888  Record.AddDeclRef(D->getSuperClass());
889  Record.AddSourceLocation(D->getSuperClassLoc());
890  Record.AddSourceLocation(D->getIvarLBraceLoc());
891  Record.AddSourceLocation(D->getIvarRBraceLoc());
892  Record.push_back(D->hasNonZeroConstructors());
893  Record.push_back(D->hasDestructors());
894  Record.push_back(D->NumIvarInitializers);
895  if (D->NumIvarInitializers)
896    Record.AddCXXCtorInitializers(
897        llvm::makeArrayRef(D->init_begin(), D->init_end()));
898  Code = serialization::DECL_OBJC_IMPLEMENTATION;
899}
900
901void ASTDeclWriter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D) {
902  VisitDecl(D);
903  Record.AddSourceLocation(D->getBeginLoc());
904  Record.AddDeclRef(D->getPropertyDecl());
905  Record.AddDeclRef(D->getPropertyIvarDecl());
906  Record.AddSourceLocation(D->getPropertyIvarDeclLoc());
907  Record.AddDeclRef(D->getGetterMethodDecl());
908  Record.AddDeclRef(D->getSetterMethodDecl());
909  Record.AddStmt(D->getGetterCXXConstructor());
910  Record.AddStmt(D->getSetterCXXAssignment());
911  Code = serialization::DECL_OBJC_PROPERTY_IMPL;
912}
913
914void ASTDeclWriter::VisitFieldDecl(FieldDecl *D) {
915  VisitDeclaratorDecl(D);
916  Record.push_back(D->isMutable());
917
918  FieldDecl::InitStorageKind ISK = D->InitStorage.getInt();
919  Record.push_back(ISK);
920  if (ISK == FieldDecl::ISK_CapturedVLAType)
921    Record.AddTypeRef(QualType(D->getCapturedVLAType(), 0));
922  else if (ISK)
923    Record.AddStmt(D->getInClassInitializer());
924
925  Record.AddStmt(D->getBitWidth());
926
927  if (!D->getDeclName())
928    Record.AddDeclRef(Context.getInstantiatedFromUnnamedFieldDecl(D));
929
930  if (D->getDeclContext() == D->getLexicalDeclContext() &&
931      !D->hasAttrs() &&
932      !D->isImplicit() &&
933      !D->isUsed(false) &&
934      !D->isInvalidDecl() &&
935      !D->isReferenced() &&
936      !D->isTopLevelDeclInObjCContainer() &&
937      !D->isModulePrivate() &&
938      !D->getBitWidth() &&
939      !D->hasInClassInitializer() &&
940      !D->hasCapturedVLAType() &&
941      !D->hasExtInfo() &&
942      !ObjCIvarDecl::classofKind(D->getKind()) &&
943      !ObjCAtDefsFieldDecl::classofKind(D->getKind()) &&
944      D->getDeclName())
945    AbbrevToUse = Writer.getDeclFieldAbbrev();
946
947  Code = serialization::DECL_FIELD;
948}
949
950void ASTDeclWriter::VisitMSPropertyDecl(MSPropertyDecl *D) {
951  VisitDeclaratorDecl(D);
952  Record.AddIdentifierRef(D->getGetterId());
953  Record.AddIdentifierRef(D->getSetterId());
954  Code = serialization::DECL_MS_PROPERTY;
955}
956
957void ASTDeclWriter::VisitMSGuidDecl(MSGuidDecl *D) {
958  VisitValueDecl(D);
959  MSGuidDecl::Parts Parts = D->getParts();
960  Record.push_back(Parts.Part1);
961  Record.push_back(Parts.Part2);
962  Record.push_back(Parts.Part3);
963  for (auto C : Parts.Part4And5)
964    Record.push_back(C);
965  Code = serialization::DECL_MS_GUID;
966}
967
968void ASTDeclWriter::VisitIndirectFieldDecl(IndirectFieldDecl *D) {
969  VisitValueDecl(D);
970  Record.push_back(D->getChainingSize());
971
972  for (const auto *P : D->chain())
973    Record.AddDeclRef(P);
974  Code = serialization::DECL_INDIRECTFIELD;
975}
976
977void ASTDeclWriter::VisitVarDecl(VarDecl *D) {
978  VisitRedeclarable(D);
979  VisitDeclaratorDecl(D);
980  Record.push_back(D->getStorageClass());
981  Record.push_back(D->getTSCSpec());
982  Record.push_back(D->getInitStyle());
983  Record.push_back(D->isARCPseudoStrong());
984  if (!isa<ParmVarDecl>(D)) {
985    Record.push_back(D->isThisDeclarationADemotedDefinition());
986    Record.push_back(D->isExceptionVariable());
987    Record.push_back(D->isNRVOVariable());
988    Record.push_back(D->isCXXForRangeDecl());
989    Record.push_back(D->isObjCForDecl());
990    Record.push_back(D->isInline());
991    Record.push_back(D->isInlineSpecified());
992    Record.push_back(D->isConstexpr());
993    Record.push_back(D->isInitCapture());
994    Record.push_back(D->isPreviousDeclInSameBlockScope());
995    if (const auto *IPD = dyn_cast<ImplicitParamDecl>(D))
996      Record.push_back(static_cast<unsigned>(IPD->getParameterKind()));
997    else
998      Record.push_back(0);
999    Record.push_back(D->isEscapingByref());
1000  }
1001  Record.push_back(D->getLinkageInternal());
1002
1003  if (D->getInit()) {
1004    if (!D->isInitKnownICE())
1005      Record.push_back(1);
1006    else {
1007      Record.push_back(
1008          2 |
1009          (D->isInitICE() ? 1 : 0) |
1010          (D->ensureEvaluatedStmt()->HasConstantDestruction ? 4 : 0));
1011    }
1012    Record.AddStmt(D->getInit());
1013  } else {
1014    Record.push_back(0);
1015  }
1016
1017  if (D->hasAttr<BlocksAttr>() && D->getType()->getAsCXXRecordDecl()) {
1018    BlockVarCopyInit Init = Writer.Context->getBlockVarCopyInit(D);
1019    Record.AddStmt(Init.getCopyExpr());
1020    if (Init.getCopyExpr())
1021      Record.push_back(Init.canThrow());
1022  }
1023
1024  if (D->getStorageDuration() == SD_Static) {
1025    bool ModulesCodegen = false;
1026    if (Writer.WritingModule &&
1027        !D->getDescribedVarTemplate() && !D->getMemberSpecializationInfo() &&
1028        !isa<VarTemplateSpecializationDecl>(D)) {
1029      // When building a C++ Modules TS module interface unit, a strong
1030      // definition in the module interface is provided by the compilation of
1031      // that module interface unit, not by its users. (Inline variables are
1032      // still emitted in module users.)
1033      ModulesCodegen =
1034          (Writer.WritingModule->Kind == Module::ModuleInterfaceUnit &&
1035           Writer.Context->GetGVALinkageForVariable(D) == GVA_StrongExternal);
1036    }
1037    Record.push_back(ModulesCodegen);
1038    if (ModulesCodegen)
1039      Writer.ModularCodegenDecls.push_back(Writer.GetDeclRef(D));
1040  }
1041
1042  enum {
1043    VarNotTemplate = 0, VarTemplate, StaticDataMemberSpecialization
1044  };
1045  if (VarTemplateDecl *TemplD = D->getDescribedVarTemplate()) {
1046    Record.push_back(VarTemplate);
1047    Record.AddDeclRef(TemplD);
1048  } else if (MemberSpecializationInfo *SpecInfo
1049               = D->getMemberSpecializationInfo()) {
1050    Record.push_back(StaticDataMemberSpecialization);
1051    Record.AddDeclRef(SpecInfo->getInstantiatedFrom());
1052    Record.push_back(SpecInfo->getTemplateSpecializationKind());
1053    Record.AddSourceLocation(SpecInfo->getPointOfInstantiation());
1054  } else {
1055    Record.push_back(VarNotTemplate);
1056  }
1057
1058  if (D->getDeclContext() == D->getLexicalDeclContext() &&
1059      !D->hasAttrs() &&
1060      !D->isImplicit() &&
1061      !D->isUsed(false) &&
1062      !D->isInvalidDecl() &&
1063      !D->isReferenced() &&
1064      !D->isTopLevelDeclInObjCContainer() &&
1065      D->getAccess() == AS_none &&
1066      !D->isModulePrivate() &&
1067      !needsAnonymousDeclarationNumber(D) &&
1068      D->getDeclName().getNameKind() == DeclarationName::Identifier &&
1069      !D->hasExtInfo() &&
1070      D->getFirstDecl() == D->getMostRecentDecl() &&
1071      D->getKind() == Decl::Var &&
1072      !D->isInline() &&
1073      !D->isConstexpr() &&
1074      !D->isInitCapture() &&
1075      !D->isPreviousDeclInSameBlockScope() &&
1076      !(D->hasAttr<BlocksAttr>() && D->getType()->getAsCXXRecordDecl()) &&
1077      !D->isEscapingByref() &&
1078      D->getStorageDuration() != SD_Static &&
1079      !D->getMemberSpecializationInfo())
1080    AbbrevToUse = Writer.getDeclVarAbbrev();
1081
1082  Code = serialization::DECL_VAR;
1083}
1084
1085void ASTDeclWriter::VisitImplicitParamDecl(ImplicitParamDecl *D) {
1086  VisitVarDecl(D);
1087  Code = serialization::DECL_IMPLICIT_PARAM;
1088}
1089
1090void ASTDeclWriter::VisitParmVarDecl(ParmVarDecl *D) {
1091  VisitVarDecl(D);
1092  Record.push_back(D->isObjCMethodParameter());
1093  Record.push_back(D->getFunctionScopeDepth());
1094  Record.push_back(D->getFunctionScopeIndex());
1095  Record.push_back(D->getObjCDeclQualifier()); // FIXME: stable encoding
1096  Record.push_back(D->isKNRPromoted());
1097  Record.push_back(D->hasInheritedDefaultArg());
1098  Record.push_back(D->hasUninstantiatedDefaultArg());
1099  if (D->hasUninstantiatedDefaultArg())
1100    Record.AddStmt(D->getUninstantiatedDefaultArg());
1101  Code = serialization::DECL_PARM_VAR;
1102
1103  // If the assumptions about the DECL_PARM_VAR abbrev are true, use it.  Here
1104  // we dynamically check for the properties that we optimize for, but don't
1105  // know are true of all PARM_VAR_DECLs.
1106  if (D->getDeclContext() == D->getLexicalDeclContext() &&
1107      !D->hasAttrs() &&
1108      !D->hasExtInfo() &&
1109      !D->isImplicit() &&
1110      !D->isUsed(false) &&
1111      !D->isInvalidDecl() &&
1112      !D->isReferenced() &&
1113      D->getAccess() == AS_none &&
1114      !D->isModulePrivate() &&
1115      D->getStorageClass() == 0 &&
1116      D->getInitStyle() == VarDecl::CInit && // Can params have anything else?
1117      D->getFunctionScopeDepth() == 0 &&
1118      D->getObjCDeclQualifier() == 0 &&
1119      !D->isKNRPromoted() &&
1120      !D->hasInheritedDefaultArg() &&
1121      D->getInit() == nullptr &&
1122      !D->hasUninstantiatedDefaultArg())  // No default expr.
1123    AbbrevToUse = Writer.getDeclParmVarAbbrev();
1124
1125  // Check things we know are true of *every* PARM_VAR_DECL, which is more than
1126  // just us assuming it.
1127  assert(!D->getTSCSpec() && "PARM_VAR_DECL can't use TLS");
1128  assert(!D->isThisDeclarationADemotedDefinition()
1129         && "PARM_VAR_DECL can't be demoted definition.");
1130  assert(D->getAccess() == AS_none && "PARM_VAR_DECL can't be public/private");
1131  assert(!D->isExceptionVariable() && "PARM_VAR_DECL can't be exception var");
1132  assert(D->getPreviousDecl() == nullptr && "PARM_VAR_DECL can't be redecl");
1133  assert(!D->isStaticDataMember() &&
1134         "PARM_VAR_DECL can't be static data member");
1135}
1136
1137void ASTDeclWriter::VisitDecompositionDecl(DecompositionDecl *D) {
1138  // Record the number of bindings first to simplify deserialization.
1139  Record.push_back(D->bindings().size());
1140
1141  VisitVarDecl(D);
1142  for (auto *B : D->bindings())
1143    Record.AddDeclRef(B);
1144  Code = serialization::DECL_DECOMPOSITION;
1145}
1146
1147void ASTDeclWriter::VisitBindingDecl(BindingDecl *D) {
1148  VisitValueDecl(D);
1149  Record.AddStmt(D->getBinding());
1150  Code = serialization::DECL_BINDING;
1151}
1152
1153void ASTDeclWriter::VisitFileScopeAsmDecl(FileScopeAsmDecl *D) {
1154  VisitDecl(D);
1155  Record.AddStmt(D->getAsmString());
1156  Record.AddSourceLocation(D->getRParenLoc());
1157  Code = serialization::DECL_FILE_SCOPE_ASM;
1158}
1159
1160void ASTDeclWriter::VisitEmptyDecl(EmptyDecl *D) {
1161  VisitDecl(D);
1162  Code = serialization::DECL_EMPTY;
1163}
1164
1165void ASTDeclWriter::VisitLifetimeExtendedTemporaryDecl(
1166    LifetimeExtendedTemporaryDecl *D) {
1167  VisitDecl(D);
1168  Record.AddDeclRef(D->getExtendingDecl());
1169  Record.AddStmt(D->getTemporaryExpr());
1170  Record.push_back(static_cast<bool>(D->getValue()));
1171  if (D->getValue())
1172    Record.AddAPValue(*D->getValue());
1173  Record.push_back(D->getManglingNumber());
1174  Code = serialization::DECL_LIFETIME_EXTENDED_TEMPORARY;
1175}
1176void ASTDeclWriter::VisitBlockDecl(BlockDecl *D) {
1177  VisitDecl(D);
1178  Record.AddStmt(D->getBody());
1179  Record.AddTypeSourceInfo(D->getSignatureAsWritten());
1180  Record.push_back(D->param_size());
1181  for (ParmVarDecl *P : D->parameters())
1182    Record.AddDeclRef(P);
1183  Record.push_back(D->isVariadic());
1184  Record.push_back(D->blockMissingReturnType());
1185  Record.push_back(D->isConversionFromLambda());
1186  Record.push_back(D->doesNotEscape());
1187  Record.push_back(D->canAvoidCopyToHeap());
1188  Record.push_back(D->capturesCXXThis());
1189  Record.push_back(D->getNumCaptures());
1190  for (const auto &capture : D->captures()) {
1191    Record.AddDeclRef(capture.getVariable());
1192
1193    unsigned flags = 0;
1194    if (capture.isByRef()) flags |= 1;
1195    if (capture.isNested()) flags |= 2;
1196    if (capture.hasCopyExpr()) flags |= 4;
1197    Record.push_back(flags);
1198
1199    if (capture.hasCopyExpr()) Record.AddStmt(capture.getCopyExpr());
1200  }
1201
1202  Code = serialization::DECL_BLOCK;
1203}
1204
1205void ASTDeclWriter::VisitCapturedDecl(CapturedDecl *CD) {
1206  Record.push_back(CD->getNumParams());
1207  VisitDecl(CD);
1208  Record.push_back(CD->getContextParamPosition());
1209  Record.push_back(CD->isNothrow() ? 1 : 0);
1210  // Body is stored by VisitCapturedStmt.
1211  for (unsigned I = 0; I < CD->getNumParams(); ++I)
1212    Record.AddDeclRef(CD->getParam(I));
1213  Code = serialization::DECL_CAPTURED;
1214}
1215
1216void ASTDeclWriter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
1217  VisitDecl(D);
1218  Record.push_back(D->getLanguage());
1219  Record.AddSourceLocation(D->getExternLoc());
1220  Record.AddSourceLocation(D->getRBraceLoc());
1221  Code = serialization::DECL_LINKAGE_SPEC;
1222}
1223
1224void ASTDeclWriter::VisitExportDecl(ExportDecl *D) {
1225  VisitDecl(D);
1226  Record.AddSourceLocation(D->getRBraceLoc());
1227  Code = serialization::DECL_EXPORT;
1228}
1229
1230void ASTDeclWriter::VisitLabelDecl(LabelDecl *D) {
1231  VisitNamedDecl(D);
1232  Record.AddSourceLocation(D->getBeginLoc());
1233  Code = serialization::DECL_LABEL;
1234}
1235
1236
1237void ASTDeclWriter::VisitNamespaceDecl(NamespaceDecl *D) {
1238  VisitRedeclarable(D);
1239  VisitNamedDecl(D);
1240  Record.push_back(D->isInline());
1241  Record.AddSourceLocation(D->getBeginLoc());
1242  Record.AddSourceLocation(D->getRBraceLoc());
1243
1244  if (D->isOriginalNamespace())
1245    Record.AddDeclRef(D->getAnonymousNamespace());
1246  Code = serialization::DECL_NAMESPACE;
1247
1248  if (Writer.hasChain() && D->isAnonymousNamespace() &&
1249      D == D->getMostRecentDecl()) {
1250    // This is a most recent reopening of the anonymous namespace. If its parent
1251    // is in a previous PCH (or is the TU), mark that parent for update, because
1252    // the original namespace always points to the latest re-opening of its
1253    // anonymous namespace.
1254    Decl *Parent = cast<Decl>(
1255        D->getParent()->getRedeclContext()->getPrimaryContext());
1256    if (Parent->isFromASTFile() || isa<TranslationUnitDecl>(Parent)) {
1257      Writer.DeclUpdates[Parent].push_back(
1258          ASTWriter::DeclUpdate(UPD_CXX_ADDED_ANONYMOUS_NAMESPACE, D));
1259    }
1260  }
1261}
1262
1263void ASTDeclWriter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
1264  VisitRedeclarable(D);
1265  VisitNamedDecl(D);
1266  Record.AddSourceLocation(D->getNamespaceLoc());
1267  Record.AddSourceLocation(D->getTargetNameLoc());
1268  Record.AddNestedNameSpecifierLoc(D->getQualifierLoc());
1269  Record.AddDeclRef(D->getNamespace());
1270  Code = serialization::DECL_NAMESPACE_ALIAS;
1271}
1272
1273void ASTDeclWriter::VisitUsingDecl(UsingDecl *D) {
1274  VisitNamedDecl(D);
1275  Record.AddSourceLocation(D->getUsingLoc());
1276  Record.AddNestedNameSpecifierLoc(D->getQualifierLoc());
1277  Record.AddDeclarationNameLoc(D->DNLoc, D->getDeclName());
1278  Record.AddDeclRef(D->FirstUsingShadow.getPointer());
1279  Record.push_back(D->hasTypename());
1280  Record.AddDeclRef(Context.getInstantiatedFromUsingDecl(D));
1281  Code = serialization::DECL_USING;
1282}
1283
1284void ASTDeclWriter::VisitUsingPackDecl(UsingPackDecl *D) {
1285  Record.push_back(D->NumExpansions);
1286  VisitNamedDecl(D);
1287  Record.AddDeclRef(D->getInstantiatedFromUsingDecl());
1288  for (auto *E : D->expansions())
1289    Record.AddDeclRef(E);
1290  Code = serialization::DECL_USING_PACK;
1291}
1292
1293void ASTDeclWriter::VisitUsingShadowDecl(UsingShadowDecl *D) {
1294  VisitRedeclarable(D);
1295  VisitNamedDecl(D);
1296  Record.AddDeclRef(D->getTargetDecl());
1297  Record.push_back(D->getIdentifierNamespace());
1298  Record.AddDeclRef(D->UsingOrNextShadow);
1299  Record.AddDeclRef(Context.getInstantiatedFromUsingShadowDecl(D));
1300  Code = serialization::DECL_USING_SHADOW;
1301}
1302
1303void ASTDeclWriter::VisitConstructorUsingShadowDecl(
1304    ConstructorUsingShadowDecl *D) {
1305  VisitUsingShadowDecl(D);
1306  Record.AddDeclRef(D->NominatedBaseClassShadowDecl);
1307  Record.AddDeclRef(D->ConstructedBaseClassShadowDecl);
1308  Record.push_back(D->IsVirtual);
1309  Code = serialization::DECL_CONSTRUCTOR_USING_SHADOW;
1310}
1311
1312void ASTDeclWriter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
1313  VisitNamedDecl(D);
1314  Record.AddSourceLocation(D->getUsingLoc());
1315  Record.AddSourceLocation(D->getNamespaceKeyLocation());
1316  Record.AddNestedNameSpecifierLoc(D->getQualifierLoc());
1317  Record.AddDeclRef(D->getNominatedNamespace());
1318  Record.AddDeclRef(dyn_cast<Decl>(D->getCommonAncestor()));
1319  Code = serialization::DECL_USING_DIRECTIVE;
1320}
1321
1322void ASTDeclWriter::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
1323  VisitValueDecl(D);
1324  Record.AddSourceLocation(D->getUsingLoc());
1325  Record.AddNestedNameSpecifierLoc(D->getQualifierLoc());
1326  Record.AddDeclarationNameLoc(D->DNLoc, D->getDeclName());
1327  Record.AddSourceLocation(D->getEllipsisLoc());
1328  Code = serialization::DECL_UNRESOLVED_USING_VALUE;
1329}
1330
1331void ASTDeclWriter::VisitUnresolvedUsingTypenameDecl(
1332                                               UnresolvedUsingTypenameDecl *D) {
1333  VisitTypeDecl(D);
1334  Record.AddSourceLocation(D->getTypenameLoc());
1335  Record.AddNestedNameSpecifierLoc(D->getQualifierLoc());
1336  Record.AddSourceLocation(D->getEllipsisLoc());
1337  Code = serialization::DECL_UNRESOLVED_USING_TYPENAME;
1338}
1339
1340void ASTDeclWriter::VisitCXXRecordDecl(CXXRecordDecl *D) {
1341  VisitRecordDecl(D);
1342
1343  enum {
1344    CXXRecNotTemplate = 0, CXXRecTemplate, CXXRecMemberSpecialization
1345  };
1346  if (ClassTemplateDecl *TemplD = D->getDescribedClassTemplate()) {
1347    Record.push_back(CXXRecTemplate);
1348    Record.AddDeclRef(TemplD);
1349  } else if (MemberSpecializationInfo *MSInfo
1350               = D->getMemberSpecializationInfo()) {
1351    Record.push_back(CXXRecMemberSpecialization);
1352    Record.AddDeclRef(MSInfo->getInstantiatedFrom());
1353    Record.push_back(MSInfo->getTemplateSpecializationKind());
1354    Record.AddSourceLocation(MSInfo->getPointOfInstantiation());
1355  } else {
1356    Record.push_back(CXXRecNotTemplate);
1357  }
1358
1359  Record.push_back(D->isThisDeclarationADefinition());
1360  if (D->isThisDeclarationADefinition())
1361    Record.AddCXXDefinitionData(D);
1362
1363  // Store (what we currently believe to be) the key function to avoid
1364  // deserializing every method so we can compute it.
1365  if (D->isCompleteDefinition())
1366    Record.AddDeclRef(Context.getCurrentKeyFunction(D));
1367
1368  Code = serialization::DECL_CXX_RECORD;
1369}
1370
1371void ASTDeclWriter::VisitCXXMethodDecl(CXXMethodDecl *D) {
1372  VisitFunctionDecl(D);
1373  if (D->isCanonicalDecl()) {
1374    Record.push_back(D->size_overridden_methods());
1375    for (const CXXMethodDecl *MD : D->overridden_methods())
1376      Record.AddDeclRef(MD);
1377  } else {
1378    // We only need to record overridden methods once for the canonical decl.
1379    Record.push_back(0);
1380  }
1381
1382  if (D->getDeclContext() == D->getLexicalDeclContext() &&
1383      D->getFirstDecl() == D->getMostRecentDecl() &&
1384      !D->isInvalidDecl() &&
1385      !D->hasAttrs() &&
1386      !D->isTopLevelDeclInObjCContainer() &&
1387      D->getDeclName().getNameKind() == DeclarationName::Identifier &&
1388      !D->hasExtInfo() &&
1389      !D->hasInheritedPrototype() &&
1390      D->hasWrittenPrototype())
1391    AbbrevToUse = Writer.getDeclCXXMethodAbbrev();
1392
1393  Code = serialization::DECL_CXX_METHOD;
1394}
1395
1396void ASTDeclWriter::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
1397  Record.push_back(D->getTraillingAllocKind());
1398  addExplicitSpecifier(D->getExplicitSpecifier(), Record);
1399  if (auto Inherited = D->getInheritedConstructor()) {
1400    Record.AddDeclRef(Inherited.getShadowDecl());
1401    Record.AddDeclRef(Inherited.getConstructor());
1402  }
1403
1404  VisitCXXMethodDecl(D);
1405  Code = serialization::DECL_CXX_CONSTRUCTOR;
1406}
1407
1408void ASTDeclWriter::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
1409  VisitCXXMethodDecl(D);
1410
1411  Record.AddDeclRef(D->getOperatorDelete());
1412  if (D->getOperatorDelete())
1413    Record.AddStmt(D->getOperatorDeleteThisArg());
1414
1415  Code = serialization::DECL_CXX_DESTRUCTOR;
1416}
1417
1418void ASTDeclWriter::VisitCXXConversionDecl(CXXConversionDecl *D) {
1419  addExplicitSpecifier(D->getExplicitSpecifier(), Record);
1420  VisitCXXMethodDecl(D);
1421  Code = serialization::DECL_CXX_CONVERSION;
1422}
1423
1424void ASTDeclWriter::VisitImportDecl(ImportDecl *D) {
1425  VisitDecl(D);
1426  Record.push_back(Writer.getSubmoduleID(D->getImportedModule()));
1427  ArrayRef<SourceLocation> IdentifierLocs = D->getIdentifierLocs();
1428  Record.push_back(!IdentifierLocs.empty());
1429  if (IdentifierLocs.empty()) {
1430    Record.AddSourceLocation(D->getEndLoc());
1431    Record.push_back(1);
1432  } else {
1433    for (unsigned I = 0, N = IdentifierLocs.size(); I != N; ++I)
1434      Record.AddSourceLocation(IdentifierLocs[I]);
1435    Record.push_back(IdentifierLocs.size());
1436  }
1437  // Note: the number of source locations must always be the last element in
1438  // the record.
1439  Code = serialization::DECL_IMPORT;
1440}
1441
1442void ASTDeclWriter::VisitAccessSpecDecl(AccessSpecDecl *D) {
1443  VisitDecl(D);
1444  Record.AddSourceLocation(D->getColonLoc());
1445  Code = serialization::DECL_ACCESS_SPEC;
1446}
1447
1448void ASTDeclWriter::VisitFriendDecl(FriendDecl *D) {
1449  // Record the number of friend type template parameter lists here
1450  // so as to simplify memory allocation during deserialization.
1451  Record.push_back(D->NumTPLists);
1452  VisitDecl(D);
1453  bool hasFriendDecl = D->Friend.is<NamedDecl*>();
1454  Record.push_back(hasFriendDecl);
1455  if (hasFriendDecl)
1456    Record.AddDeclRef(D->getFriendDecl());
1457  else
1458    Record.AddTypeSourceInfo(D->getFriendType());
1459  for (unsigned i = 0; i < D->NumTPLists; ++i)
1460    Record.AddTemplateParameterList(D->getFriendTypeTemplateParameterList(i));
1461  Record.AddDeclRef(D->getNextFriend());
1462  Record.push_back(D->UnsupportedFriend);
1463  Record.AddSourceLocation(D->FriendLoc);
1464  Code = serialization::DECL_FRIEND;
1465}
1466
1467void ASTDeclWriter::VisitFriendTemplateDecl(FriendTemplateDecl *D) {
1468  VisitDecl(D);
1469  Record.push_back(D->getNumTemplateParameters());
1470  for (unsigned i = 0, e = D->getNumTemplateParameters(); i != e; ++i)
1471    Record.AddTemplateParameterList(D->getTemplateParameterList(i));
1472  Record.push_back(D->getFriendDecl() != nullptr);
1473  if (D->getFriendDecl())
1474    Record.AddDeclRef(D->getFriendDecl());
1475  else
1476    Record.AddTypeSourceInfo(D->getFriendType());
1477  Record.AddSourceLocation(D->getFriendLoc());
1478  Code = serialization::DECL_FRIEND_TEMPLATE;
1479}
1480
1481void ASTDeclWriter::VisitTemplateDecl(TemplateDecl *D) {
1482  VisitNamedDecl(D);
1483
1484  Record.AddDeclRef(D->getTemplatedDecl());
1485  Record.AddTemplateParameterList(D->getTemplateParameters());
1486}
1487
1488void ASTDeclWriter::VisitConceptDecl(ConceptDecl *D) {
1489  VisitTemplateDecl(D);
1490  Record.AddStmt(D->getConstraintExpr());
1491  Code = serialization::DECL_CONCEPT;
1492}
1493
1494void ASTDeclWriter::VisitRequiresExprBodyDecl(RequiresExprBodyDecl *D) {
1495  Code = serialization::DECL_REQUIRES_EXPR_BODY;
1496}
1497
1498void ASTDeclWriter::VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D) {
1499  VisitRedeclarable(D);
1500
1501  // Emit data to initialize CommonOrPrev before VisitTemplateDecl so that
1502  // getCommonPtr() can be used while this is still initializing.
1503  if (D->isFirstDecl()) {
1504    // This declaration owns the 'common' pointer, so serialize that data now.
1505    Record.AddDeclRef(D->getInstantiatedFromMemberTemplate());
1506    if (D->getInstantiatedFromMemberTemplate())
1507      Record.push_back(D->isMemberSpecialization());
1508  }
1509
1510  VisitTemplateDecl(D);
1511  Record.push_back(D->getIdentifierNamespace());
1512}
1513
1514void ASTDeclWriter::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1515  VisitRedeclarableTemplateDecl(D);
1516
1517  if (D->isFirstDecl())
1518    AddTemplateSpecializations(D);
1519  Code = serialization::DECL_CLASS_TEMPLATE;
1520}
1521
1522void ASTDeclWriter::VisitClassTemplateSpecializationDecl(
1523                                           ClassTemplateSpecializationDecl *D) {
1524  RegisterTemplateSpecialization(D->getSpecializedTemplate(), D);
1525
1526  VisitCXXRecordDecl(D);
1527
1528  llvm::PointerUnion<ClassTemplateDecl *,
1529                     ClassTemplatePartialSpecializationDecl *> InstFrom
1530    = D->getSpecializedTemplateOrPartial();
1531  if (Decl *InstFromD = InstFrom.dyn_cast<ClassTemplateDecl *>()) {
1532    Record.AddDeclRef(InstFromD);
1533  } else {
1534    Record.AddDeclRef(InstFrom.get<ClassTemplatePartialSpecializationDecl *>());
1535    Record.AddTemplateArgumentList(&D->getTemplateInstantiationArgs());
1536  }
1537
1538  Record.AddTemplateArgumentList(&D->getTemplateArgs());
1539  Record.AddSourceLocation(D->getPointOfInstantiation());
1540  Record.push_back(D->getSpecializationKind());
1541  Record.push_back(D->isCanonicalDecl());
1542
1543  if (D->isCanonicalDecl()) {
1544    // When reading, we'll add it to the folding set of the following template.
1545    Record.AddDeclRef(D->getSpecializedTemplate()->getCanonicalDecl());
1546  }
1547
1548  // Explicit info.
1549  Record.AddTypeSourceInfo(D->getTypeAsWritten());
1550  if (D->getTypeAsWritten()) {
1551    Record.AddSourceLocation(D->getExternLoc());
1552    Record.AddSourceLocation(D->getTemplateKeywordLoc());
1553  }
1554
1555  Code = serialization::DECL_CLASS_TEMPLATE_SPECIALIZATION;
1556}
1557
1558void ASTDeclWriter::VisitClassTemplatePartialSpecializationDecl(
1559                                    ClassTemplatePartialSpecializationDecl *D) {
1560  Record.AddTemplateParameterList(D->getTemplateParameters());
1561  Record.AddASTTemplateArgumentListInfo(D->getTemplateArgsAsWritten());
1562
1563  VisitClassTemplateSpecializationDecl(D);
1564
1565  // These are read/set from/to the first declaration.
1566  if (D->getPreviousDecl() == nullptr) {
1567    Record.AddDeclRef(D->getInstantiatedFromMember());
1568    Record.push_back(D->isMemberSpecialization());
1569  }
1570
1571  Code = serialization::DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION;
1572}
1573
1574void ASTDeclWriter::VisitVarTemplateDecl(VarTemplateDecl *D) {
1575  VisitRedeclarableTemplateDecl(D);
1576
1577  if (D->isFirstDecl())
1578    AddTemplateSpecializations(D);
1579  Code = serialization::DECL_VAR_TEMPLATE;
1580}
1581
1582void ASTDeclWriter::VisitVarTemplateSpecializationDecl(
1583    VarTemplateSpecializationDecl *D) {
1584  RegisterTemplateSpecialization(D->getSpecializedTemplate(), D);
1585
1586  VisitVarDecl(D);
1587
1588  llvm::PointerUnion<VarTemplateDecl *, VarTemplatePartialSpecializationDecl *>
1589  InstFrom = D->getSpecializedTemplateOrPartial();
1590  if (Decl *InstFromD = InstFrom.dyn_cast<VarTemplateDecl *>()) {
1591    Record.AddDeclRef(InstFromD);
1592  } else {
1593    Record.AddDeclRef(InstFrom.get<VarTemplatePartialSpecializationDecl *>());
1594    Record.AddTemplateArgumentList(&D->getTemplateInstantiationArgs());
1595  }
1596
1597  // Explicit info.
1598  Record.AddTypeSourceInfo(D->getTypeAsWritten());
1599  if (D->getTypeAsWritten()) {
1600    Record.AddSourceLocation(D->getExternLoc());
1601    Record.AddSourceLocation(D->getTemplateKeywordLoc());
1602  }
1603
1604  Record.AddTemplateArgumentList(&D->getTemplateArgs());
1605  Record.AddSourceLocation(D->getPointOfInstantiation());
1606  Record.push_back(D->getSpecializationKind());
1607  Record.push_back(D->IsCompleteDefinition);
1608  Record.push_back(D->isCanonicalDecl());
1609
1610  if (D->isCanonicalDecl()) {
1611    // When reading, we'll add it to the folding set of the following template.
1612    Record.AddDeclRef(D->getSpecializedTemplate()->getCanonicalDecl());
1613  }
1614
1615  Code = serialization::DECL_VAR_TEMPLATE_SPECIALIZATION;
1616}
1617
1618void ASTDeclWriter::VisitVarTemplatePartialSpecializationDecl(
1619    VarTemplatePartialSpecializationDecl *D) {
1620  Record.AddTemplateParameterList(D->getTemplateParameters());
1621  Record.AddASTTemplateArgumentListInfo(D->getTemplateArgsAsWritten());
1622
1623  VisitVarTemplateSpecializationDecl(D);
1624
1625  // These are read/set from/to the first declaration.
1626  if (D->getPreviousDecl() == nullptr) {
1627    Record.AddDeclRef(D->getInstantiatedFromMember());
1628    Record.push_back(D->isMemberSpecialization());
1629  }
1630
1631  Code = serialization::DECL_VAR_TEMPLATE_PARTIAL_SPECIALIZATION;
1632}
1633
1634void ASTDeclWriter::VisitClassScopeFunctionSpecializationDecl(
1635                                    ClassScopeFunctionSpecializationDecl *D) {
1636  VisitDecl(D);
1637  Record.AddDeclRef(D->getSpecialization());
1638  Record.push_back(D->hasExplicitTemplateArgs());
1639  if (D->hasExplicitTemplateArgs())
1640    Record.AddASTTemplateArgumentListInfo(D->getTemplateArgsAsWritten());
1641  Code = serialization::DECL_CLASS_SCOPE_FUNCTION_SPECIALIZATION;
1642}
1643
1644
1645void ASTDeclWriter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1646  VisitRedeclarableTemplateDecl(D);
1647
1648  if (D->isFirstDecl())
1649    AddTemplateSpecializations(D);
1650  Code = serialization::DECL_FUNCTION_TEMPLATE;
1651}
1652
1653void ASTDeclWriter::VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D) {
1654  Record.push_back(D->hasTypeConstraint());
1655  VisitTypeDecl(D);
1656
1657  Record.push_back(D->wasDeclaredWithTypename());
1658
1659  const TypeConstraint *TC = D->getTypeConstraint();
1660  Record.push_back(TC != nullptr);
1661  if (TC) {
1662    Record.AddNestedNameSpecifierLoc(TC->getNestedNameSpecifierLoc());
1663    Record.AddDeclarationNameInfo(TC->getConceptNameInfo());
1664    Record.AddDeclRef(TC->getNamedConcept());
1665    Record.push_back(TC->getTemplateArgsAsWritten() != nullptr);
1666    if (TC->getTemplateArgsAsWritten())
1667      Record.AddASTTemplateArgumentListInfo(TC->getTemplateArgsAsWritten());
1668    Record.AddStmt(TC->getImmediatelyDeclaredConstraint());
1669    Record.push_back(D->isExpandedParameterPack());
1670    if (D->isExpandedParameterPack())
1671      Record.push_back(D->getNumExpansionParameters());
1672  }
1673
1674  bool OwnsDefaultArg = D->hasDefaultArgument() &&
1675                        !D->defaultArgumentWasInherited();
1676  Record.push_back(OwnsDefaultArg);
1677  if (OwnsDefaultArg)
1678    Record.AddTypeSourceInfo(D->getDefaultArgumentInfo());
1679
1680  Code = serialization::DECL_TEMPLATE_TYPE_PARM;
1681}
1682
1683void ASTDeclWriter::VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {
1684  // For an expanded parameter pack, record the number of expansion types here
1685  // so that it's easier for deserialization to allocate the right amount of
1686  // memory.
1687  Expr *TypeConstraint = D->getPlaceholderTypeConstraint();
1688  Record.push_back(!!TypeConstraint);
1689  if (D->isExpandedParameterPack())
1690    Record.push_back(D->getNumExpansionTypes());
1691
1692  VisitDeclaratorDecl(D);
1693  // TemplateParmPosition.
1694  Record.push_back(D->getDepth());
1695  Record.push_back(D->getPosition());
1696  if (TypeConstraint)
1697    Record.AddStmt(TypeConstraint);
1698
1699  if (D->isExpandedParameterPack()) {
1700    for (unsigned I = 0, N = D->getNumExpansionTypes(); I != N; ++I) {
1701      Record.AddTypeRef(D->getExpansionType(I));
1702      Record.AddTypeSourceInfo(D->getExpansionTypeSourceInfo(I));
1703    }
1704
1705    Code = serialization::DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK;
1706  } else {
1707    // Rest of NonTypeTemplateParmDecl.
1708    Record.push_back(D->isParameterPack());
1709    bool OwnsDefaultArg = D->hasDefaultArgument() &&
1710                          !D->defaultArgumentWasInherited();
1711    Record.push_back(OwnsDefaultArg);
1712    if (OwnsDefaultArg)
1713      Record.AddStmt(D->getDefaultArgument());
1714    Code = serialization::DECL_NON_TYPE_TEMPLATE_PARM;
1715  }
1716}
1717
1718void ASTDeclWriter::VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D) {
1719  // For an expanded parameter pack, record the number of expansion types here
1720  // so that it's easier for deserialization to allocate the right amount of
1721  // memory.
1722  if (D->isExpandedParameterPack())
1723    Record.push_back(D->getNumExpansionTemplateParameters());
1724
1725  VisitTemplateDecl(D);
1726  // TemplateParmPosition.
1727  Record.push_back(D->getDepth());
1728  Record.push_back(D->getPosition());
1729
1730  if (D->isExpandedParameterPack()) {
1731    for (unsigned I = 0, N = D->getNumExpansionTemplateParameters();
1732         I != N; ++I)
1733      Record.AddTemplateParameterList(D->getExpansionTemplateParameters(I));
1734    Code = serialization::DECL_EXPANDED_TEMPLATE_TEMPLATE_PARM_PACK;
1735  } else {
1736    // Rest of TemplateTemplateParmDecl.
1737    Record.push_back(D->isParameterPack());
1738    bool OwnsDefaultArg = D->hasDefaultArgument() &&
1739                          !D->defaultArgumentWasInherited();
1740    Record.push_back(OwnsDefaultArg);
1741    if (OwnsDefaultArg)
1742      Record.AddTemplateArgumentLoc(D->getDefaultArgument());
1743    Code = serialization::DECL_TEMPLATE_TEMPLATE_PARM;
1744  }
1745}
1746
1747void ASTDeclWriter::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) {
1748  VisitRedeclarableTemplateDecl(D);
1749  Code = serialization::DECL_TYPE_ALIAS_TEMPLATE;
1750}
1751
1752void ASTDeclWriter::VisitStaticAssertDecl(StaticAssertDecl *D) {
1753  VisitDecl(D);
1754  Record.AddStmt(D->getAssertExpr());
1755  Record.push_back(D->isFailed());
1756  Record.AddStmt(D->getMessage());
1757  Record.AddSourceLocation(D->getRParenLoc());
1758  Code = serialization::DECL_STATIC_ASSERT;
1759}
1760
1761/// Emit the DeclContext part of a declaration context decl.
1762void ASTDeclWriter::VisitDeclContext(DeclContext *DC) {
1763  Record.AddOffset(Writer.WriteDeclContextLexicalBlock(Context, DC));
1764  Record.AddOffset(Writer.WriteDeclContextVisibleBlock(Context, DC));
1765}
1766
1767const Decl *ASTWriter::getFirstLocalDecl(const Decl *D) {
1768  assert(IsLocalDecl(D) && "expected a local declaration");
1769
1770  const Decl *Canon = D->getCanonicalDecl();
1771  if (IsLocalDecl(Canon))
1772    return Canon;
1773
1774  const Decl *&CacheEntry = FirstLocalDeclCache[Canon];
1775  if (CacheEntry)
1776    return CacheEntry;
1777
1778  for (const Decl *Redecl = D; Redecl; Redecl = Redecl->getPreviousDecl())
1779    if (IsLocalDecl(Redecl))
1780      D = Redecl;
1781  return CacheEntry = D;
1782}
1783
1784template <typename T>
1785void ASTDeclWriter::VisitRedeclarable(Redeclarable<T> *D) {
1786  T *First = D->getFirstDecl();
1787  T *MostRecent = First->getMostRecentDecl();
1788  T *DAsT = static_cast<T *>(D);
1789  if (MostRecent != First) {
1790    assert(isRedeclarableDeclKind(DAsT->getKind()) &&
1791           "Not considered redeclarable?");
1792
1793    Record.AddDeclRef(First);
1794
1795    // Write out a list of local redeclarations of this declaration if it's the
1796    // first local declaration in the chain.
1797    const Decl *FirstLocal = Writer.getFirstLocalDecl(DAsT);
1798    if (DAsT == FirstLocal) {
1799      // Emit a list of all imported first declarations so that we can be sure
1800      // that all redeclarations visible to this module are before D in the
1801      // redecl chain.
1802      unsigned I = Record.size();
1803      Record.push_back(0);
1804      if (Writer.Chain)
1805        AddFirstDeclFromEachModule(DAsT, /*IncludeLocal*/false);
1806      // This is the number of imported first declarations + 1.
1807      Record[I] = Record.size() - I;
1808
1809      // Collect the set of local redeclarations of this declaration, from
1810      // newest to oldest.
1811      ASTWriter::RecordData LocalRedecls;
1812      ASTRecordWriter LocalRedeclWriter(Record, LocalRedecls);
1813      for (const Decl *Prev = FirstLocal->getMostRecentDecl();
1814           Prev != FirstLocal; Prev = Prev->getPreviousDecl())
1815        if (!Prev->isFromASTFile())
1816          LocalRedeclWriter.AddDeclRef(Prev);
1817
1818      // If we have any redecls, write them now as a separate record preceding
1819      // the declaration itself.
1820      if (LocalRedecls.empty())
1821        Record.push_back(0);
1822      else
1823        Record.AddOffset(LocalRedeclWriter.Emit(LOCAL_REDECLARATIONS));
1824    } else {
1825      Record.push_back(0);
1826      Record.AddDeclRef(FirstLocal);
1827    }
1828
1829    // Make sure that we serialize both the previous and the most-recent
1830    // declarations, which (transitively) ensures that all declarations in the
1831    // chain get serialized.
1832    //
1833    // FIXME: This is not correct; when we reach an imported declaration we
1834    // won't emit its previous declaration.
1835    (void)Writer.GetDeclRef(D->getPreviousDecl());
1836    (void)Writer.GetDeclRef(MostRecent);
1837  } else {
1838    // We use the sentinel value 0 to indicate an only declaration.
1839    Record.push_back(0);
1840  }
1841}
1842
1843void ASTDeclWriter::VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D) {
1844  Record.push_back(D->varlist_size());
1845  VisitDecl(D);
1846  for (auto *I : D->varlists())
1847    Record.AddStmt(I);
1848  Code = serialization::DECL_OMP_THREADPRIVATE;
1849}
1850
1851void ASTDeclWriter::VisitOMPAllocateDecl(OMPAllocateDecl *D) {
1852  Record.push_back(D->varlist_size());
1853  Record.push_back(D->clauselist_size());
1854  VisitDecl(D);
1855  for (auto *I : D->varlists())
1856    Record.AddStmt(I);
1857  for (OMPClause *C : D->clauselists())
1858    Record.writeOMPClause(C);
1859  Code = serialization::DECL_OMP_ALLOCATE;
1860}
1861
1862void ASTDeclWriter::VisitOMPRequiresDecl(OMPRequiresDecl *D) {
1863  Record.push_back(D->clauselist_size());
1864  VisitDecl(D);
1865  for (OMPClause *C : D->clauselists())
1866    Record.writeOMPClause(C);
1867  Code = serialization::DECL_OMP_REQUIRES;
1868}
1869
1870void ASTDeclWriter::VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D) {
1871  VisitValueDecl(D);
1872  Record.AddSourceLocation(D->getBeginLoc());
1873  Record.AddStmt(D->getCombinerIn());
1874  Record.AddStmt(D->getCombinerOut());
1875  Record.AddStmt(D->getCombiner());
1876  Record.AddStmt(D->getInitOrig());
1877  Record.AddStmt(D->getInitPriv());
1878  Record.AddStmt(D->getInitializer());
1879  Record.push_back(D->getInitializerKind());
1880  Record.AddDeclRef(D->getPrevDeclInScope());
1881  Code = serialization::DECL_OMP_DECLARE_REDUCTION;
1882}
1883
1884void ASTDeclWriter::VisitOMPDeclareMapperDecl(OMPDeclareMapperDecl *D) {
1885  Record.push_back(D->clauselist_size());
1886  VisitValueDecl(D);
1887  Record.AddSourceLocation(D->getBeginLoc());
1888  Record.AddStmt(D->getMapperVarRef());
1889  Record.AddDeclarationName(D->getVarName());
1890  Record.AddDeclRef(D->getPrevDeclInScope());
1891  for (OMPClause *C : D->clauselists())
1892    Record.writeOMPClause(C);
1893  Code = serialization::DECL_OMP_DECLARE_MAPPER;
1894}
1895
1896void ASTDeclWriter::VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D) {
1897  VisitVarDecl(D);
1898  Code = serialization::DECL_OMP_CAPTUREDEXPR;
1899}
1900
1901//===----------------------------------------------------------------------===//
1902// ASTWriter Implementation
1903//===----------------------------------------------------------------------===//
1904
1905void ASTWriter::WriteDeclAbbrevs() {
1906  using namespace llvm;
1907
1908  std::shared_ptr<BitCodeAbbrev> Abv;
1909
1910  // Abbreviation for DECL_FIELD
1911  Abv = std::make_shared<BitCodeAbbrev>();
1912  Abv->Add(BitCodeAbbrevOp(serialization::DECL_FIELD));
1913  // Decl
1914  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1915  Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1916  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1917  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1918  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1919  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1920  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1921  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1922  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1923  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1924  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1925  // NamedDecl
1926  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1927  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1928  Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1929  // ValueDecl
1930  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1931  // DeclaratorDecl
1932  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1933  Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1934  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TSIType
1935  // FieldDecl
1936  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1937  Abv->Add(BitCodeAbbrevOp(0));                       // InitStyle
1938  // Type Source Info
1939  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1940  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1941  DeclFieldAbbrev = Stream.EmitAbbrev(std::move(Abv));
1942
1943  // Abbreviation for DECL_OBJC_IVAR
1944  Abv = std::make_shared<BitCodeAbbrev>();
1945  Abv->Add(BitCodeAbbrevOp(serialization::DECL_OBJC_IVAR));
1946  // Decl
1947  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1948  Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1949  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1950  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1951  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1952  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1953  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1954  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1955  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));  // AccessSpecifier
1956  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1957  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1958  // NamedDecl
1959  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1960  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1961  Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
1962  // ValueDecl
1963  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
1964  // DeclaratorDecl
1965  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
1966  Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
1967  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TSIType
1968  // FieldDecl
1969  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isMutable
1970  Abv->Add(BitCodeAbbrevOp(0));                       // InitStyle
1971  // ObjC Ivar
1972  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getAccessControl
1973  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getSynthesize
1974  // Type Source Info
1975  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
1976  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
1977  DeclObjCIvarAbbrev = Stream.EmitAbbrev(std::move(Abv));
1978
1979  // Abbreviation for DECL_ENUM
1980  Abv = std::make_shared<BitCodeAbbrev>();
1981  Abv->Add(BitCodeAbbrevOp(serialization::DECL_ENUM));
1982  // Redeclarable
1983  Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
1984  // Decl
1985  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
1986  Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
1987  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
1988  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
1989  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
1990  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
1991  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
1992  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
1993  Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
1994  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
1995  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
1996  // NamedDecl
1997  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
1998  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
1999  Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
2000  // TypeDecl
2001  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
2002  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
2003  // TagDecl
2004  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
2005  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
2006  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
2007  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
2008  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
2009  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsCompleteDefinitionRequired
2010  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
2011  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
2012  Abv->Add(BitCodeAbbrevOp(0));                         // ExtInfoKind
2013  // EnumDecl
2014  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // AddTypeRef
2015  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IntegerType
2016  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getPromotionType
2017  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumPositiveBits
2018  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getNumNegativeBits
2019  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScoped
2020  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isScopedUsingClassTag
2021  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isFixed
2022  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32));// ODRHash
2023  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // InstantiatedMembEnum
2024  // DC
2025  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
2026  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
2027  DeclEnumAbbrev = Stream.EmitAbbrev(std::move(Abv));
2028
2029  // Abbreviation for DECL_RECORD
2030  Abv = std::make_shared<BitCodeAbbrev>();
2031  Abv->Add(BitCodeAbbrevOp(serialization::DECL_RECORD));
2032  // Redeclarable
2033  Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
2034  // Decl
2035  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
2036  Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
2037  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
2038  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
2039  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
2040  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
2041  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
2042  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
2043  Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
2044  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
2045  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
2046  // NamedDecl
2047  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
2048  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
2049  Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
2050  // TypeDecl
2051  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
2052  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
2053  // TagDecl
2054  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // IdentifierNamespace
2055  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // getTagKind
2056  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCompleteDefinition
2057  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // EmbeddedInDeclarator
2058  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsFreeStanding
2059  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsCompleteDefinitionRequired
2060  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
2061  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SourceLocation
2062  Abv->Add(BitCodeAbbrevOp(0));                         // ExtInfoKind
2063  // RecordDecl
2064  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // FlexibleArrayMember
2065  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // AnonymousStructUnion
2066  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasObjectMember
2067  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // hasVolatileMember
2068
2069  // isNonTrivialToPrimitiveDefaultInitialize
2070  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
2071  // isNonTrivialToPrimitiveCopy
2072  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
2073  // isNonTrivialToPrimitiveDestroy
2074  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
2075  // hasNonTrivialToPrimitiveDefaultInitializeCUnion
2076  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
2077  // hasNonTrivialToPrimitiveDestructCUnion
2078  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
2079  // hasNonTrivialToPrimitiveCopyCUnion
2080  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
2081  // isParamDestroyedInCallee
2082  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));
2083  // getArgPassingRestrictions
2084  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2));
2085
2086  // DC
2087  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LexicalOffset
2088  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // VisibleOffset
2089  DeclRecordAbbrev = Stream.EmitAbbrev(std::move(Abv));
2090
2091  // Abbreviation for DECL_PARM_VAR
2092  Abv = std::make_shared<BitCodeAbbrev>();
2093  Abv->Add(BitCodeAbbrevOp(serialization::DECL_PARM_VAR));
2094  // Redeclarable
2095  Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
2096  // Decl
2097  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
2098  Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
2099  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
2100  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
2101  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
2102  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
2103  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
2104  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
2105  Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
2106  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
2107  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
2108  // NamedDecl
2109  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
2110  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
2111  Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
2112  // ValueDecl
2113  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2114  // DeclaratorDecl
2115  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
2116  Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
2117  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TSIType
2118  // VarDecl
2119  Abv->Add(BitCodeAbbrevOp(0));                       // SClass
2120  Abv->Add(BitCodeAbbrevOp(0));                       // TSCSpec
2121  Abv->Add(BitCodeAbbrevOp(0));                       // InitStyle
2122  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isARCPseudoStrong
2123  Abv->Add(BitCodeAbbrevOp(0));                       // Linkage
2124  Abv->Add(BitCodeAbbrevOp(0));                       // HasInit
2125  Abv->Add(BitCodeAbbrevOp(0));                   // HasMemberSpecializationInfo
2126  // ParmVarDecl
2127  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsObjCMethodParameter
2128  Abv->Add(BitCodeAbbrevOp(0));                       // ScopeDepth
2129  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ScopeIndex
2130  Abv->Add(BitCodeAbbrevOp(0));                       // ObjCDeclQualifier
2131  Abv->Add(BitCodeAbbrevOp(0));                       // KNRPromoted
2132  Abv->Add(BitCodeAbbrevOp(0));                       // HasInheritedDefaultArg
2133  Abv->Add(BitCodeAbbrevOp(0));                   // HasUninstantiatedDefaultArg
2134  // Type Source Info
2135  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2136  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
2137  DeclParmVarAbbrev = Stream.EmitAbbrev(std::move(Abv));
2138
2139  // Abbreviation for DECL_TYPEDEF
2140  Abv = std::make_shared<BitCodeAbbrev>();
2141  Abv->Add(BitCodeAbbrevOp(serialization::DECL_TYPEDEF));
2142  // Redeclarable
2143  Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
2144  // Decl
2145  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
2146  Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
2147  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
2148  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
2149  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
2150  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isUsed
2151  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isReferenced
2152  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
2153  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // C++ AccessSpecifier
2154  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
2155  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
2156  // NamedDecl
2157  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
2158  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
2159  Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
2160  // TypeDecl
2161  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Source Location
2162  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type Ref
2163  // TypedefDecl
2164  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2165  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
2166  DeclTypedefAbbrev = Stream.EmitAbbrev(std::move(Abv));
2167
2168  // Abbreviation for DECL_VAR
2169  Abv = std::make_shared<BitCodeAbbrev>();
2170  Abv->Add(BitCodeAbbrevOp(serialization::DECL_VAR));
2171  // Redeclarable
2172  Abv->Add(BitCodeAbbrevOp(0));                       // No redeclaration
2173  // Decl
2174  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclContext
2175  Abv->Add(BitCodeAbbrevOp(0));                       // LexicalDeclContext
2176  Abv->Add(BitCodeAbbrevOp(0));                       // isInvalidDecl
2177  Abv->Add(BitCodeAbbrevOp(0));                       // HasAttrs
2178  Abv->Add(BitCodeAbbrevOp(0));                       // isImplicit
2179  Abv->Add(BitCodeAbbrevOp(0));                       // isUsed
2180  Abv->Add(BitCodeAbbrevOp(0));                       // isReferenced
2181  Abv->Add(BitCodeAbbrevOp(0));                   // TopLevelDeclInObjCContainer
2182  Abv->Add(BitCodeAbbrevOp(AS_none));                 // C++ AccessSpecifier
2183  Abv->Add(BitCodeAbbrevOp(0));                       // ModulePrivate
2184  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // SubmoduleID
2185  // NamedDecl
2186  Abv->Add(BitCodeAbbrevOp(0));                       // NameKind = Identifier
2187  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Name
2188  Abv->Add(BitCodeAbbrevOp(0));                       // AnonDeclNumber
2189  // ValueDecl
2190  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2191  // DeclaratorDecl
2192  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // InnerStartLoc
2193  Abv->Add(BitCodeAbbrevOp(0));                       // hasExtInfo
2194  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TSIType
2195  // VarDecl
2196  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // SClass
2197  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // TSCSpec
2198  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // InitStyle
2199  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isARCPseudoStrong
2200  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // IsThisDeclarationADemotedDefinition
2201  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isExceptionVariable
2202  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isNRVOVariable
2203  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isCXXForRangeDecl
2204  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isObjCForDecl
2205  Abv->Add(BitCodeAbbrevOp(0));                         // isInline
2206  Abv->Add(BitCodeAbbrevOp(0));                         // isInlineSpecified
2207  Abv->Add(BitCodeAbbrevOp(0));                         // isConstexpr
2208  Abv->Add(BitCodeAbbrevOp(0));                         // isInitCapture
2209  Abv->Add(BitCodeAbbrevOp(0));                         // isPrevDeclInSameScope
2210  Abv->Add(BitCodeAbbrevOp(0));                         // ImplicitParamKind
2211  Abv->Add(BitCodeAbbrevOp(0));                         // EscapingByref
2212  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Linkage
2213  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // IsInitICE (local)
2214  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // VarKind (local enum)
2215  // Type Source Info
2216  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2217  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // TypeLoc
2218  DeclVarAbbrev = Stream.EmitAbbrev(std::move(Abv));
2219
2220  // Abbreviation for DECL_CXX_METHOD
2221  Abv = std::make_shared<BitCodeAbbrev>();
2222  Abv->Add(BitCodeAbbrevOp(serialization::DECL_CXX_METHOD));
2223  // RedeclarableDecl
2224  Abv->Add(BitCodeAbbrevOp(0));                         // CanonicalDecl
2225  // Decl
2226  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // DeclContext
2227  Abv->Add(BitCodeAbbrevOp(0));                         // LexicalDeclContext
2228  Abv->Add(BitCodeAbbrevOp(0));                         // Invalid
2229  Abv->Add(BitCodeAbbrevOp(0));                         // HasAttrs
2230  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Implicit
2231  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Used
2232  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Referenced
2233  Abv->Add(BitCodeAbbrevOp(0));                         // InObjCContainer
2234  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // Access
2235  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ModulePrivate
2236  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // SubmoduleID
2237  // NamedDecl
2238  Abv->Add(BitCodeAbbrevOp(DeclarationName::Identifier)); // NameKind
2239  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // Identifier
2240  Abv->Add(BitCodeAbbrevOp(0));                         // AnonDeclNumber
2241  // ValueDecl
2242  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // Type
2243  // DeclaratorDecl
2244  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // InnerLocStart
2245  Abv->Add(BitCodeAbbrevOp(0));                         // HasExtInfo
2246  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // TSIType
2247  // FunctionDecl
2248  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 11)); // IDNS
2249  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // StorageClass
2250  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Inline
2251  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // InlineSpecified
2252  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // VirtualAsWritten
2253  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Pure
2254  Abv->Add(BitCodeAbbrevOp(0));                         // HasInheritedProto
2255  Abv->Add(BitCodeAbbrevOp(1));                         // HasWrittenProto
2256  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Deleted
2257  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Trivial
2258  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // TrivialForCall
2259  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Defaulted
2260  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ExplicitlyDefaulted
2261  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ImplicitReturnZero
2262  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constexpr
2263  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // UsesSEHTry
2264  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // SkippedBody
2265  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // MultiVersion
2266  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // LateParsed
2267  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Linkage
2268  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));   // LocEnd
2269  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 32)); // ODRHash
2270  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // TemplateKind
2271  // This Array slurps the rest of the record. Fortunately we want to encode
2272  // (nearly) all the remaining (variable number of) fields in the same way.
2273  //
2274  // This is the function template information if any, then
2275  //         NumParams and Params[] from FunctionDecl, and
2276  //         NumOverriddenMethods, OverriddenMethods[] from CXXMethodDecl.
2277  //
2278  //  Add an AbbrevOp for 'size then elements' and use it here.
2279  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
2280  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6));
2281  DeclCXXMethodAbbrev = Stream.EmitAbbrev(std::move(Abv));
2282
2283  // Abbreviation for EXPR_DECL_REF
2284  Abv = std::make_shared<BitCodeAbbrev>();
2285  Abv->Add(BitCodeAbbrevOp(serialization::EXPR_DECL_REF));
2286  //Stmt
2287  // Expr
2288  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2289  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2290  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2291  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2292  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2293  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ContainsErrors
2294  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2295  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2296  //DeclRefExpr
2297  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HasQualifier
2298  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //GetDeclFound
2299  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ExplicitTemplateArgs
2300  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //HadMultipleCandidates
2301  Abv->Add(BitCodeAbbrevOp(0)); // RefersToEnclosingVariableOrCapture
2302  Abv->Add(BitCodeAbbrevOp(0)); // NonOdrUseReason
2303  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // DeclRef
2304  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
2305  DeclRefExprAbbrev = Stream.EmitAbbrev(std::move(Abv));
2306
2307  // Abbreviation for EXPR_INTEGER_LITERAL
2308  Abv = std::make_shared<BitCodeAbbrev>();
2309  Abv->Add(BitCodeAbbrevOp(serialization::EXPR_INTEGER_LITERAL));
2310  //Stmt
2311  // Expr
2312  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2313  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2314  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2315  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2316  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2317  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ContainsErrors
2318  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2319  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2320  //Integer Literal
2321  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
2322  Abv->Add(BitCodeAbbrevOp(32));                      // Bit Width
2323  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Value
2324  IntegerLiteralAbbrev = Stream.EmitAbbrev(std::move(Abv));
2325
2326  // Abbreviation for EXPR_CHARACTER_LITERAL
2327  Abv = std::make_shared<BitCodeAbbrev>();
2328  Abv->Add(BitCodeAbbrevOp(serialization::EXPR_CHARACTER_LITERAL));
2329  //Stmt
2330  // Expr
2331  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2332  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2333  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2334  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2335  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2336  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ContainsErrors
2337  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2338  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2339  //Character Literal
2340  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // getValue
2341  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Location
2342  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // getKind
2343  CharacterLiteralAbbrev = Stream.EmitAbbrev(std::move(Abv));
2344
2345  // Abbreviation for EXPR_IMPLICIT_CAST
2346  Abv = std::make_shared<BitCodeAbbrev>();
2347  Abv->Add(BitCodeAbbrevOp(serialization::EXPR_IMPLICIT_CAST));
2348  // Stmt
2349  // Expr
2350  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
2351  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
2352  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
2353  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
2354  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
2355  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ContainsErrors
2356  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
2357  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
2358  // CastExpr
2359  Abv->Add(BitCodeAbbrevOp(0)); // PathSize
2360  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 6)); // CastKind
2361  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // PartOfExplicitCast
2362  // ImplicitCastExpr
2363  ExprImplicitCastAbbrev = Stream.EmitAbbrev(std::move(Abv));
2364
2365  Abv = std::make_shared<BitCodeAbbrev>();
2366  Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_LEXICAL));
2367  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2368  DeclContextLexicalAbbrev = Stream.EmitAbbrev(std::move(Abv));
2369
2370  Abv = std::make_shared<BitCodeAbbrev>();
2371  Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_VISIBLE));
2372  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
2373  DeclContextVisibleLookupAbbrev = Stream.EmitAbbrev(std::move(Abv));
2374}
2375
2376/// isRequiredDecl - Check if this is a "required" Decl, which must be seen by
2377/// consumers of the AST.
2378///
2379/// Such decls will always be deserialized from the AST file, so we would like
2380/// this to be as restrictive as possible. Currently the predicate is driven by
2381/// code generation requirements, if other clients have a different notion of
2382/// what is "required" then we may have to consider an alternate scheme where
2383/// clients can iterate over the top-level decls and get information on them,
2384/// without necessary deserializing them. We could explicitly require such
2385/// clients to use a separate API call to "realize" the decl. This should be
2386/// relatively painless since they would presumably only do it for top-level
2387/// decls.
2388static bool isRequiredDecl(const Decl *D, ASTContext &Context,
2389                           bool WritingModule) {
2390  // An ObjCMethodDecl is never considered as "required" because its
2391  // implementation container always is.
2392
2393  // File scoped assembly or obj-c or OMP declare target implementation must be
2394  // seen.
2395  if (isa<FileScopeAsmDecl>(D) || isa<ObjCImplDecl>(D))
2396    return true;
2397
2398  if (WritingModule && isPartOfPerModuleInitializer(D)) {
2399    // These declarations are part of the module initializer, and are emitted
2400    // if and when the module is imported, rather than being emitted eagerly.
2401    return false;
2402  }
2403
2404  return Context.DeclMustBeEmitted(D);
2405}
2406
2407void ASTWriter::WriteDecl(ASTContext &Context, Decl *D) {
2408  PrettyDeclStackTraceEntry CrashInfo(Context, D, SourceLocation(),
2409                                      "serializing");
2410
2411  // Determine the ID for this declaration.
2412  serialization::DeclID ID;
2413  assert(!D->isFromASTFile() && "should not be emitting imported decl");
2414  serialization::DeclID &IDR = DeclIDs[D];
2415  if (IDR == 0)
2416    IDR = NextDeclID++;
2417
2418  ID = IDR;
2419
2420  assert(ID >= FirstDeclID && "invalid decl ID");
2421
2422  RecordData Record;
2423  ASTDeclWriter W(*this, Context, Record);
2424
2425  // Build a record for this declaration
2426  W.Visit(D);
2427
2428  // Emit this declaration to the bitstream.
2429  uint64_t Offset = W.Emit(D);
2430
2431  // Record the offset for this declaration
2432  SourceLocation Loc = D->getLocation();
2433  unsigned Index = ID - FirstDeclID;
2434  if (DeclOffsets.size() == Index)
2435    DeclOffsets.emplace_back(Loc, Offset, DeclTypesBlockStartOffset);
2436  else if (DeclOffsets.size() < Index) {
2437    // FIXME: Can/should this happen?
2438    DeclOffsets.resize(Index+1);
2439    DeclOffsets[Index].setLocation(Loc);
2440    DeclOffsets[Index].setBitOffset(Offset, DeclTypesBlockStartOffset);
2441  } else {
2442    llvm_unreachable("declarations should be emitted in ID order");
2443  }
2444
2445  SourceManager &SM = Context.getSourceManager();
2446  if (Loc.isValid() && SM.isLocalSourceLocation(Loc))
2447    associateDeclWithFile(D, ID);
2448
2449  // Note declarations that should be deserialized eagerly so that we can add
2450  // them to a record in the AST file later.
2451  if (isRequiredDecl(D, Context, WritingModule))
2452    EagerlyDeserializedDecls.push_back(ID);
2453}
2454
2455void ASTRecordWriter::AddFunctionDefinition(const FunctionDecl *FD) {
2456  // Switch case IDs are per function body.
2457  Writer->ClearSwitchCaseIDs();
2458
2459  assert(FD->doesThisDeclarationHaveABody());
2460  bool ModulesCodegen = false;
2461  if (!FD->isDependentContext()) {
2462    Optional<GVALinkage> Linkage;
2463    if (Writer->WritingModule &&
2464        Writer->WritingModule->Kind == Module::ModuleInterfaceUnit) {
2465      // When building a C++ Modules TS module interface unit, a strong
2466      // definition in the module interface is provided by the compilation of
2467      // that module interface unit, not by its users. (Inline functions are
2468      // still emitted in module users.)
2469      Linkage = Writer->Context->GetGVALinkageForFunction(FD);
2470      ModulesCodegen = *Linkage == GVA_StrongExternal;
2471    }
2472    if (Writer->Context->getLangOpts().ModulesCodegen) {
2473      // Under -fmodules-codegen, codegen is performed for all non-internal,
2474      // non-always_inline functions, unless they are available elsewhere.
2475      if (!FD->hasAttr<AlwaysInlineAttr>()) {
2476        if (!Linkage)
2477          Linkage = Writer->Context->GetGVALinkageForFunction(FD);
2478        ModulesCodegen =
2479            *Linkage != GVA_Internal && *Linkage != GVA_AvailableExternally;
2480      }
2481    }
2482  }
2483  Record->push_back(ModulesCodegen);
2484  if (ModulesCodegen)
2485    Writer->ModularCodegenDecls.push_back(Writer->GetDeclRef(FD));
2486  if (auto *CD = dyn_cast<CXXConstructorDecl>(FD)) {
2487    Record->push_back(CD->getNumCtorInitializers());
2488    if (CD->getNumCtorInitializers())
2489      AddCXXCtorInitializers(
2490          llvm::makeArrayRef(CD->init_begin(), CD->init_end()));
2491  }
2492  AddStmt(FD->getBody());
2493}
2494