/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h

Bug Summary

File:	tools/clang/include/clang/AST/DeclTemplate.h
Warning:	line 1821, column 31 Access to field 'PartialSpecialization' results in a dereference of a null pointer (loaded from variable 'PS')

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name ASTReaderDecl.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-eagerly-assume -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -mrelocation-model pic -pic-level 2 -mthread-model posix -relaxed-aliasing -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-7/lib/clang/7.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-7~svn337204/build-llvm/tools/clang/lib/Serialization -I /build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization -I /build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn337204/build-llvm/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn337204/build-llvm/include -I /build/llvm-toolchain-snapshot-7~svn337204/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0/backward -internal-isystem /usr/include/clang/7.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-7/lib/clang/7.0.0/include -internal-externc-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-7~svn337204/build-llvm/tools/clang/lib/Serialization -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -fobjc-runtime=gcc -fno-common -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2018-07-17-043059-5239-1 -x c++ /build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp

/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp

→

1//===- ASTReaderDecl.cpp - Decl Deserialization ---------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements the ASTReader::ReadDeclRecord method, which is the
11// entrypoint for loading a decl.
12//
13//===----------------------------------------------------------------------===//

15#include "ASTCommon.h"
16#include "ASTReaderInternals.h"
17#include "clang/AST/ASTContext.h"
18#include "clang/AST/Attr.h"
19#include "clang/AST/AttrIterator.h"
20#include "clang/AST/Decl.h"
21#include "clang/AST/DeclBase.h"
22#include "clang/AST/DeclCXX.h"
23#include "clang/AST/DeclFriend.h"
24#include "clang/AST/DeclObjC.h"
25#include "clang/AST/DeclOpenMP.h"
26#include "clang/AST/DeclTemplate.h"
27#include "clang/AST/DeclVisitor.h"
28#include "clang/AST/DeclarationName.h"
29#include "clang/AST/Expr.h"
30#include "clang/AST/ExternalASTSource.h"
31#include "clang/AST/LambdaCapture.h"
32#include "clang/AST/NestedNameSpecifier.h"
33#include "clang/AST/Redeclarable.h"
34#include "clang/AST/Stmt.h"
35#include "clang/AST/TemplateBase.h"
36#include "clang/AST/Type.h"
37#include "clang/AST/UnresolvedSet.h"
38#include "clang/Basic/AttrKinds.h"
39#include "clang/Basic/ExceptionSpecificationType.h"
40#include "clang/Basic/IdentifierTable.h"
41#include "clang/Basic/LLVM.h"
42#include "clang/Basic/Lambda.h"
43#include "clang/Basic/LangOptions.h"
44#include "clang/Basic/Linkage.h"
45#include "clang/Basic/Module.h"
46#include "clang/Basic/PragmaKinds.h"
47#include "clang/Basic/SourceLocation.h"
48#include "clang/Basic/Specifiers.h"
49#include "clang/Sema/IdentifierResolver.h"
50#include "clang/Sema/SemaDiagnostic.h"
51#include "clang/Serialization/ASTBitCodes.h"
52#include "clang/Serialization/ASTReader.h"
53#include "clang/Serialization/ContinuousRangeMap.h"
54#include "clang/Serialization/Module.h"
55#include "llvm/ADT/DenseMap.h"
56#include "llvm/ADT/FoldingSet.h"
57#include "llvm/ADT/STLExtras.h"
58#include "llvm/ADT/SmallPtrSet.h"
59#include "llvm/ADT/SmallVector.h"
60#include "llvm/ADT/iterator_range.h"
61#include "llvm/Bitcode/BitstreamReader.h"
62#include "llvm/Support/Casting.h"
63#include "llvm/Support/ErrorHandling.h"
64#include "llvm/Support/SaveAndRestore.h"
65#include <algorithm>
66#include <cassert>
67#include <cstdint>
68#include <cstring>
69#include <string>
70#include <utility>

72using namespace clang;
73using namespace serialization;

75//===----------------------------------------------------------------------===//
76// Declaration deserialization
77//===----------------------------------------------------------------------===//

79namespace clang {

class ASTDeclReader : public DeclVisitor<ASTDeclReader, void> {
  ASTReader &Reader;
  ASTRecordReader &Record;
  ASTReader::RecordLocation Loc;
  const DeclID ThisDeclID;
  const SourceLocation ThisDeclLoc;

  using RecordData = ASTReader::RecordData;

  TypeID DeferredTypeID = 0;
  unsigned AnonymousDeclNumber;
  GlobalDeclID NamedDeclForTagDecl = 0;
  IdentifierInfo *TypedefNameForLinkage = nullptr;

  bool HasPendingBody = false;

  ///A flag to carry the information for a decl from the entity is
  /// used. We use it to delay the marking of the canonical decl as used until
  /// the entire declaration is deserialized and merged.
  bool IsDeclMarkedUsed = false;

  uint64_t GetCurrentCursorOffset();

  uint64_t ReadLocalOffset() {
    uint64_t LocalOffset = Record.readInt();
    assert(LocalOffset < Loc.Offset && "offset point after current record")(static_cast <bool> (LocalOffset < Loc.Offset &&
 "offset point after current record") ? void (0) : __assert_fail
 ("LocalOffset < Loc.Offset && \"offset point after current record\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 106, __extension__ __PRETTY_FUNCTION__));
    return LocalOffset ? Loc.Offset - LocalOffset : 0;
  }

  uint64_t ReadGlobalOffset() {
    uint64_t Local = ReadLocalOffset();
    return Local ? Record.getGlobalBitOffset(Local) : 0;
  }

  SourceLocation ReadSourceLocation() {
    return Record.readSourceLocation();
  }

  SourceRange ReadSourceRange() {
    return Record.readSourceRange();
  }

  TypeSourceInfo *GetTypeSourceInfo() {
    return Record.getTypeSourceInfo();
  }

  serialization::DeclID ReadDeclID() {
    return Record.readDeclID();
  }

  std::string ReadString() {
    return Record.readString();
  }

  void ReadDeclIDList(SmallVectorImpl<DeclID> &IDs) {
    for (unsigned I = 0, Size = Record.readInt(); I != Size; ++I)
      IDs.push_back(ReadDeclID());
  }

  Decl *ReadDecl() {
    return Record.readDecl();
  }

  template<typename T>
  T *ReadDeclAs() {
    return Record.readDeclAs<T>();
  }

  void ReadQualifierInfo(QualifierInfo &Info) {
    Record.readQualifierInfo(Info);
  }

  void ReadDeclarationNameLoc(DeclarationNameLoc &DNLoc, DeclarationName Name) {
    Record.readDeclarationNameLoc(DNLoc, Name);
  }

  serialization::SubmoduleID readSubmoduleID() {
    if (Record.getIdx() == Record.size())
      return 0;

    return Record.getGlobalSubmoduleID(Record.readInt());
  }

  Module *readModule() {
    return Record.getSubmodule(readSubmoduleID());
  }

  void ReadCXXRecordDefinition(CXXRecordDecl *D, bool Update);
  void ReadCXXDefinitionData(struct CXXRecordDecl::DefinitionData &Data,
                             const CXXRecordDecl *D);
  void MergeDefinitionData(CXXRecordDecl *D,
                           struct CXXRecordDecl::DefinitionData &&NewDD);
  void ReadObjCDefinitionData(struct ObjCInterfaceDecl::DefinitionData &Data);
  void MergeDefinitionData(ObjCInterfaceDecl *D,
                           struct ObjCInterfaceDecl::DefinitionData &&NewDD);
  void ReadObjCDefinitionData(struct ObjCProtocolDecl::DefinitionData &Data);
  void MergeDefinitionData(ObjCProtocolDecl *D,
                           struct ObjCProtocolDecl::DefinitionData &&NewDD);

  static DeclContext *getPrimaryDCForAnonymousDecl(DeclContext *LexicalDC);

  static NamedDecl *getAnonymousDeclForMerging(ASTReader &Reader,
                                               DeclContext *DC,
                                               unsigned Index);
  static void setAnonymousDeclForMerging(ASTReader &Reader, DeclContext *DC,
                                         unsigned Index, NamedDecl *D);

  /// Results from loading a RedeclarableDecl.
  class RedeclarableResult {
    Decl *MergeWith;
    GlobalDeclID FirstID;
    bool IsKeyDecl;

  public:
    RedeclarableResult(Decl *MergeWith, GlobalDeclID FirstID, bool IsKeyDecl)
        : MergeWith(MergeWith), FirstID(FirstID), IsKeyDecl(IsKeyDecl) {}

    /// Retrieve the first ID.
    GlobalDeclID getFirstID() const { return FirstID; }

    /// Is this declaration a key declaration?
    bool isKeyDecl() const { return IsKeyDecl; }

    /// Get a known declaration that this should be merged with, if
    /// any.
    Decl *getKnownMergeTarget() const { return MergeWith; }
  };

  /// Class used to capture the result of searching for an existing
  /// declaration of a specific kind and name, along with the ability
  /// to update the place where this result was found (the declaration
  /// chain hanging off an identifier or the DeclContext we searched in)
  /// if requested.
  class FindExistingResult {
    ASTReader &Reader;
    NamedDecl *New = nullptr;
    NamedDecl *Existing = nullptr;
    bool AddResult = false;
    unsigned AnonymousDeclNumber = 0;
    IdentifierInfo *TypedefNameForLinkage = nullptr;

  public:
    FindExistingResult(ASTReader &Reader) : Reader(Reader) {}

    FindExistingResult(ASTReader &Reader, NamedDecl *New, NamedDecl *Existing,
                       unsigned AnonymousDeclNumber,
                       IdentifierInfo *TypedefNameForLinkage)
        : Reader(Reader), New(New), Existing(Existing), AddResult(true),
          AnonymousDeclNumber(AnonymousDeclNumber),
          TypedefNameForLinkage(TypedefNameForLinkage) {}

    FindExistingResult(FindExistingResult &&Other)
        : Reader(Other.Reader), New(Other.New), Existing(Other.Existing),
          AddResult(Other.AddResult),
          AnonymousDeclNumber(Other.AnonymousDeclNumber),
          TypedefNameForLinkage(Other.TypedefNameForLinkage) {
      Other.AddResult = false;
    }

    FindExistingResult &operator=(FindExistingResult &&) = delete;
    ~FindExistingResult();

    /// Suppress the addition of this result into the known set of
    /// names.
    void suppress() { AddResult = false; }

    operator NamedDecl*() const { return Existing; }

    template<typename T>
    operator T*() const { return dyn_cast_or_null<T>(Existing); }
  };

  static DeclContext *getPrimaryContextForMerging(ASTReader &Reader,
                                                  DeclContext *DC);
  FindExistingResult findExisting(NamedDecl *D);

public:
  ASTDeclReader(ASTReader &Reader, ASTRecordReader &Record,
                ASTReader::RecordLocation Loc,
                DeclID thisDeclID, SourceLocation ThisDeclLoc)
      : Reader(Reader), Record(Record), Loc(Loc), ThisDeclID(thisDeclID),
        ThisDeclLoc(ThisDeclLoc) {}

  template <typename T> static
  void AddLazySpecializations(T *D,
                              SmallVectorImpl<serialization::DeclID>& IDs) {
    if (IDs.empty())
      return;

    // FIXME: We should avoid this pattern of getting the ASTContext.
    ASTContext &C = D->getASTContext();

    auto *&LazySpecializations = D->getCommonPtr()->LazySpecializations;

    if (auto &Old = LazySpecializations) {
      IDs.insert(IDs.end(), Old + 1, Old + 1 + Old[0]);
      llvm::sort(IDs.begin(), IDs.end());
      IDs.erase(std::unique(IDs.begin(), IDs.end()), IDs.end());
    }

    auto *Result = new (C) serialization::DeclID[1 + IDs.size()];
    *Result = IDs.size();
    std::copy(IDs.begin(), IDs.end(), Result + 1);

    LazySpecializations = Result;
  }

  template <typename DeclT>
  static Decl *getMostRecentDeclImpl(Redeclarable<DeclT> *D);
  static Decl *getMostRecentDeclImpl(...);
  static Decl *getMostRecentDecl(Decl *D);

  template <typename DeclT>
  static void attachPreviousDeclImpl(ASTReader &Reader,
                                     Redeclarable<DeclT> *D, Decl *Previous,
                                     Decl *Canon);
  static void attachPreviousDeclImpl(ASTReader &Reader, ...);
  static void attachPreviousDecl(ASTReader &Reader, Decl *D, Decl *Previous,
                                 Decl *Canon);

  template <typename DeclT>
  static void attachLatestDeclImpl(Redeclarable<DeclT> *D, Decl *Latest);
  static void attachLatestDeclImpl(...);
  static void attachLatestDecl(Decl *D, Decl *latest);

  template <typename DeclT>
  static void markIncompleteDeclChainImpl(Redeclarable<DeclT> *D);
  static void markIncompleteDeclChainImpl(...);

  /// Determine whether this declaration has a pending body.
  bool hasPendingBody() const { return HasPendingBody; }

  void ReadFunctionDefinition(FunctionDecl *FD);
  void Visit(Decl *D);

  void UpdateDecl(Decl *D, SmallVectorImpl<serialization::DeclID> &);

  static void setNextObjCCategory(ObjCCategoryDecl *Cat,
                                  ObjCCategoryDecl *Next) {
    Cat->NextClassCategory = Next;
  }

  void VisitDecl(Decl *D);
  void VisitPragmaCommentDecl(PragmaCommentDecl *D);
  void VisitPragmaDetectMismatchDecl(PragmaDetectMismatchDecl *D);
  void VisitTranslationUnitDecl(TranslationUnitDecl *TU);
  void VisitNamedDecl(NamedDecl *ND);
  void VisitLabelDecl(LabelDecl *LD);
  void VisitNamespaceDecl(NamespaceDecl *D);
  void VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
  void VisitNamespaceAliasDecl(NamespaceAliasDecl *D);
  void VisitTypeDecl(TypeDecl *TD);
  RedeclarableResult VisitTypedefNameDecl(TypedefNameDecl *TD);
  void VisitTypedefDecl(TypedefDecl *TD);
  void VisitTypeAliasDecl(TypeAliasDecl *TD);
  void VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
  RedeclarableResult VisitTagDecl(TagDecl *TD);
  void VisitEnumDecl(EnumDecl *ED);
  RedeclarableResult VisitRecordDeclImpl(RecordDecl *RD);
  void VisitRecordDecl(RecordDecl *RD) { VisitRecordDeclImpl(RD); }
  RedeclarableResult VisitCXXRecordDeclImpl(CXXRecordDecl *D);
  void VisitCXXRecordDecl(CXXRecordDecl *D) { VisitCXXRecordDeclImpl(D); }
  RedeclarableResult VisitClassTemplateSpecializationDeclImpl(
                                          ClassTemplateSpecializationDecl *D);

  void VisitClassTemplateSpecializationDecl(
      ClassTemplateSpecializationDecl *D) {
    VisitClassTemplateSpecializationDeclImpl(D);
  }

  void VisitClassTemplatePartialSpecializationDecl(
                                   ClassTemplatePartialSpecializationDecl *D);
  void VisitClassScopeFunctionSpecializationDecl(
                                     ClassScopeFunctionSpecializationDecl *D);
  RedeclarableResult
  VisitVarTemplateSpecializationDeclImpl(VarTemplateSpecializationDecl *D);

  void VisitVarTemplateSpecializationDecl(VarTemplateSpecializationDecl *D) {
    VisitVarTemplateSpecializationDeclImpl(D);
  }

  void VisitVarTemplatePartialSpecializationDecl(
      VarTemplatePartialSpecializationDecl *D);
  void VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D);
  void VisitValueDecl(ValueDecl *VD);
  void VisitEnumConstantDecl(EnumConstantDecl *ECD);
  void VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
  void VisitDeclaratorDecl(DeclaratorDecl *DD);
  void VisitFunctionDecl(FunctionDecl *FD);
  void VisitCXXDeductionGuideDecl(CXXDeductionGuideDecl *GD);
  void VisitCXXMethodDecl(CXXMethodDecl *D);
  void VisitCXXConstructorDecl(CXXConstructorDecl *D);
  void VisitCXXDestructorDecl(CXXDestructorDecl *D);
  void VisitCXXConversionDecl(CXXConversionDecl *D);
  void VisitFieldDecl(FieldDecl *FD);
  void VisitMSPropertyDecl(MSPropertyDecl *FD);
  void VisitIndirectFieldDecl(IndirectFieldDecl *FD);
  RedeclarableResult VisitVarDeclImpl(VarDecl *D);
  void VisitVarDecl(VarDecl *VD) { VisitVarDeclImpl(VD); }
  void VisitImplicitParamDecl(ImplicitParamDecl *PD);
  void VisitParmVarDecl(ParmVarDecl *PD);
  void VisitDecompositionDecl(DecompositionDecl *DD);
  void VisitBindingDecl(BindingDecl *BD);
  void VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D);
  DeclID VisitTemplateDecl(TemplateDecl *D);
  RedeclarableResult VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D);
  void VisitClassTemplateDecl(ClassTemplateDecl *D);
  void VisitBuiltinTemplateDecl(BuiltinTemplateDecl *D);
  void VisitVarTemplateDecl(VarTemplateDecl *D);
  void VisitFunctionTemplateDecl(FunctionTemplateDecl *D);
  void VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D);
  void VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D);
  void VisitUsingDecl(UsingDecl *D);
  void VisitUsingPackDecl(UsingPackDecl *D);
  void VisitUsingShadowDecl(UsingShadowDecl *D);
  void VisitConstructorUsingShadowDecl(ConstructorUsingShadowDecl *D);
  void VisitLinkageSpecDecl(LinkageSpecDecl *D);
  void VisitExportDecl(ExportDecl *D);
  void VisitFileScopeAsmDecl(FileScopeAsmDecl *AD);
  void VisitImportDecl(ImportDecl *D);
  void VisitAccessSpecDecl(AccessSpecDecl *D);
  void VisitFriendDecl(FriendDecl *D);
  void VisitFriendTemplateDecl(FriendTemplateDecl *D);
  void VisitStaticAssertDecl(StaticAssertDecl *D);
  void VisitBlockDecl(BlockDecl *BD);
  void VisitCapturedDecl(CapturedDecl *CD);
  void VisitEmptyDecl(EmptyDecl *D);

  std::pair<uint64_t, uint64_t> VisitDeclContext(DeclContext *DC);

  template<typename T>
  RedeclarableResult VisitRedeclarable(Redeclarable<T> *D);

  template<typename T>
  void mergeRedeclarable(Redeclarable<T> *D, RedeclarableResult &Redecl,
                         DeclID TemplatePatternID = 0);

  template<typename T>
  void mergeRedeclarable(Redeclarable<T> *D, T *Existing,
                         RedeclarableResult &Redecl,
                         DeclID TemplatePatternID = 0);

  template<typename T>
  void mergeMergeable(Mergeable<T> *D);

  void mergeTemplatePattern(RedeclarableTemplateDecl *D,
                            RedeclarableTemplateDecl *Existing,
                            DeclID DsID, bool IsKeyDecl);

  ObjCTypeParamList *ReadObjCTypeParamList();

  // FIXME: Reorder according to DeclNodes.td?
  void VisitObjCMethodDecl(ObjCMethodDecl *D);
  void VisitObjCTypeParamDecl(ObjCTypeParamDecl *D);
  void VisitObjCContainerDecl(ObjCContainerDecl *D);
  void VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
  void VisitObjCIvarDecl(ObjCIvarDecl *D);
  void VisitObjCProtocolDecl(ObjCProtocolDecl *D);
  void VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D);
  void VisitObjCCategoryDecl(ObjCCategoryDecl *D);
  void VisitObjCImplDecl(ObjCImplDecl *D);
  void VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
  void VisitObjCImplementationDecl(ObjCImplementationDecl *D);
  void VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *D);
  void VisitObjCPropertyDecl(ObjCPropertyDecl *D);
  void VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
  void VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D);
  void VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D);
  void VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D);
};

452} // namespace clang

454namespace {

456/// Iterator over the redeclarations of a declaration that have already
457/// been merged into the same redeclaration chain.
458template<typename DeclT>
459class MergedRedeclIterator {
DeclT *Start;
DeclT *Canonical = nullptr;
DeclT *Current = nullptr;

464public:
MergedRedeclIterator() = default;
MergedRedeclIterator(DeclT *Start) : Start(Start), Current(Start) {}

DeclT *operator*() { return Current; }

MergedRedeclIterator &operator++() {
  if (Current->isFirstDecl()) {
    Canonical = Current;
    Current = Current->getMostRecentDecl();
  } else
    Current = Current->getPreviousDecl();

  // If we started in the merged portion, we'll reach our start position
  // eventually. Otherwise, we'll never reach it, but the second declaration
  // we reached was the canonical declaration, so stop when we see that one
  // again.
  if (Current == Start || Current == Canonical)
    Current = nullptr;
  return *this;
}

friend bool operator!=(const MergedRedeclIterator &A,
                       const MergedRedeclIterator &B) {
  return A.Current != B.Current;
}
490};

492} // namespace

494template <typename DeclT>
495static llvm::iterator_range<MergedRedeclIterator<DeclT>>
496merged_redecls(DeclT *D) {
return llvm::make_range(MergedRedeclIterator<DeclT>(D),
                        MergedRedeclIterator<DeclT>());
499}

501uint64_t ASTDeclReader::GetCurrentCursorOffset() {
return Loc.F->DeclsCursor.GetCurrentBitNo() + Loc.F->GlobalBitOffset;
503}

505void ASTDeclReader::ReadFunctionDefinition(FunctionDecl *FD) {
if (Record.readInt())
  Reader.DefinitionSource[FD] = Loc.F->Kind == ModuleKind::MK_MainFile;
if (auto *CD = dyn_cast<CXXConstructorDecl>(FD)) {
  CD->NumCtorInitializers = Record.readInt();
  if (CD->NumCtorInitializers)
    CD->CtorInitializers = ReadGlobalOffset();
}
// Store the offset of the body so we can lazily load it later.
Reader.PendingBodies[FD] = GetCurrentCursorOffset();
HasPendingBody = true;
516}

518void ASTDeclReader::Visit(Decl *D) {
DeclVisitor<ASTDeclReader, void>::Visit(D);

// At this point we have deserialized and merged the decl and it is safe to
// update its canonical decl to signal that the entire entity is used.
D->getCanonicalDecl()->Used |= IsDeclMarkedUsed;
IsDeclMarkedUsed = false;

if (auto *DD = dyn_cast<DeclaratorDecl>(D)) {
  if (auto *TInfo = DD->getTypeSourceInfo())
    Record.readTypeLoc(TInfo->getTypeLoc());
}

if (auto *TD = dyn_cast<TypeDecl>(D)) {
  // We have a fully initialized TypeDecl. Read its type now.
  TD->setTypeForDecl(Reader.GetType(DeferredTypeID).getTypePtrOrNull());

  // If this is a tag declaration with a typedef name for linkage, it's safe
  // to load that typedef now.
  if (NamedDeclForTagDecl)
    cast<TagDecl>(D)->TypedefNameDeclOrQualifier =
        cast<TypedefNameDecl>(Reader.GetDecl(NamedDeclForTagDecl));
} else if (auto *ID = dyn_cast<ObjCInterfaceDecl>(D)) {
  // if we have a fully initialized TypeDecl, we can safely read its type now.
  ID->TypeForDecl = Reader.GetType(DeferredTypeID).getTypePtrOrNull();
} else if (auto *FD = dyn_cast<FunctionDecl>(D)) {
  if (DeferredTypeID)
    FD->setType(Reader.GetType(DeferredTypeID));

  // FunctionDecl's body was written last after all other Stmts/Exprs.
  // We only read it if FD doesn't already have a body (e.g., from another
  // module).
  // FIXME: Can we diagnose ODR violations somehow?
  if (Record.readInt())
    ReadFunctionDefinition(FD);
}
554}

556void ASTDeclReader::VisitDecl(Decl *D) {
if (D->isTemplateParameter() || D->isTemplateParameterPack() ||
    isa<ParmVarDecl>(D)) {
  // We don't want to deserialize the DeclContext of a template
  // parameter or of a parameter of a function template immediately.   These
  // entities might be used in the formulation of its DeclContext (for
  // example, a function parameter can be used in decltype() in trailing
  // return type of the function).  Use the translation unit DeclContext as a
  // placeholder.
  GlobalDeclID SemaDCIDForTemplateParmDecl = ReadDeclID();
  GlobalDeclID LexicalDCIDForTemplateParmDecl = ReadDeclID();
  if (!LexicalDCIDForTemplateParmDecl)
    LexicalDCIDForTemplateParmDecl = SemaDCIDForTemplateParmDecl;
  Reader.addPendingDeclContextInfo(D,
                                   SemaDCIDForTemplateParmDecl,
                                   LexicalDCIDForTemplateParmDecl);
  D->setDeclContext(Reader.getContext().getTranslationUnitDecl()); 
} else {
  auto *SemaDC = ReadDeclAs<DeclContext>();
  auto *LexicalDC = ReadDeclAs<DeclContext>();
  if (!LexicalDC)
    LexicalDC = SemaDC;
  DeclContext *MergedSemaDC = Reader.MergedDeclContexts.lookup(SemaDC);
  // Avoid calling setLexicalDeclContext() directly because it uses
  // Decl::getASTContext() internally which is unsafe during derialization.
  D->setDeclContextsImpl(MergedSemaDC ? MergedSemaDC : SemaDC, LexicalDC,
                         Reader.getContext());
}
D->setLocation(ThisDeclLoc);
D->setInvalidDecl(Record.readInt());
if (Record.readInt()) { // hasAttrs
  AttrVec Attrs;
  Record.readAttributes(Attrs);
  // Avoid calling setAttrs() directly because it uses Decl::getASTContext()
  // internally which is unsafe during derialization.
  D->setAttrsImpl(Attrs, Reader.getContext());
}
D->setImplicit(Record.readInt());
D->Used = Record.readInt();
IsDeclMarkedUsed |= D->Used;
D->setReferenced(Record.readInt());
D->setTopLevelDeclInObjCContainer(Record.readInt());
D->setAccess((AccessSpecifier)Record.readInt());
D->FromASTFile = true;
bool ModulePrivate = Record.readInt();

// Determine whether this declaration is part of a (sub)module. If so, it
// may not yet be visible.
if (unsigned SubmoduleID = readSubmoduleID()) {
  // Store the owning submodule ID in the declaration.
  D->setModuleOwnershipKind(
      ModulePrivate ? Decl::ModuleOwnershipKind::ModulePrivate
                    : Decl::ModuleOwnershipKind::VisibleWhenImported);
  D->setOwningModuleID(SubmoduleID);

  if (ModulePrivate) {
    // Module-private declarations are never visible, so there is no work to
    // do.
  } else if (Reader.getContext().getLangOpts().ModulesLocalVisibility) {
    // If local visibility is being tracked, this declaration will become
    // hidden and visible as the owning module does.
  } else if (Module *Owner = Reader.getSubmodule(SubmoduleID)) {
    // Mark the declaration as visible when its owning module becomes visible.
    if (Owner->NameVisibility == Module::AllVisible)
      D->setVisibleDespiteOwningModule();
    else
      Reader.HiddenNamesMap[Owner].push_back(D);
  }
} else if (ModulePrivate) {
  D->setModuleOwnershipKind(Decl::ModuleOwnershipKind::ModulePrivate);
}
627}

629void ASTDeclReader::VisitPragmaCommentDecl(PragmaCommentDecl *D) {
VisitDecl(D);
D->setLocation(ReadSourceLocation());
D->CommentKind = (PragmaMSCommentKind)Record.readInt();
std::string Arg = ReadString();
memcpy(D->getTrailingObjects<char>(), Arg.data(), Arg.size());
D->getTrailingObjects<char>()[Arg.size()] = '\0';
636}

638void ASTDeclReader::VisitPragmaDetectMismatchDecl(PragmaDetectMismatchDecl *D) {
VisitDecl(D);
D->setLocation(ReadSourceLocation());
std::string Name = ReadString();
memcpy(D->getTrailingObjects<char>(), Name.data(), Name.size());
D->getTrailingObjects<char>()[Name.size()] = '\0';

D->ValueStart = Name.size() + 1;
std::string Value = ReadString();
memcpy(D->getTrailingObjects<char>() + D->ValueStart, Value.data(),
       Value.size());
D->getTrailingObjects<char>()[D->ValueStart + Value.size()] = '\0';
650}

652void ASTDeclReader::VisitTranslationUnitDecl(TranslationUnitDecl *TU) {
llvm_unreachable("Translation units are not serialized")::llvm::llvm_unreachable_internal("Translation units are not serialized"
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 653);
654}

656void ASTDeclReader::VisitNamedDecl(NamedDecl *ND) {
VisitDecl(ND);
ND->setDeclName(Record.readDeclarationName());
AnonymousDeclNumber = Record.readInt();
660}

662void ASTDeclReader::VisitTypeDecl(TypeDecl *TD) {
VisitNamedDecl(TD);
TD->setLocStart(ReadSourceLocation());
// Delay type reading until after we have fully initialized the decl.
DeferredTypeID = Record.getGlobalTypeID(Record.readInt());
667}

669ASTDeclReader::RedeclarableResult
670ASTDeclReader::VisitTypedefNameDecl(TypedefNameDecl *TD) {
RedeclarableResult Redecl = VisitRedeclarable(TD);
VisitTypeDecl(TD);
TypeSourceInfo *TInfo = GetTypeSourceInfo();
if (Record.readInt()) { // isModed
  QualType modedT = Record.readType();
  TD->setModedTypeSourceInfo(TInfo, modedT);
} else
  TD->setTypeSourceInfo(TInfo);
// Read and discard the declaration for which this is a typedef name for
// linkage, if it exists. We cannot rely on our type to pull in this decl,
// because it might have been merged with a type from another module and
// thus might not refer to our version of the declaration.
ReadDecl();
return Redecl;
685}

687void ASTDeclReader::VisitTypedefDecl(TypedefDecl *TD) {
RedeclarableResult Redecl = VisitTypedefNameDecl(TD);
mergeRedeclarable(TD, Redecl);
690}

692void ASTDeclReader::VisitTypeAliasDecl(TypeAliasDecl *TD) {
RedeclarableResult Redecl = VisitTypedefNameDecl(TD);
if (auto *Template = ReadDeclAs<TypeAliasTemplateDecl>())
  // Merged when we merge the template.
  TD->setDescribedAliasTemplate(Template);
else
  mergeRedeclarable(TD, Redecl);
699}

701ASTDeclReader::RedeclarableResult ASTDeclReader::VisitTagDecl(TagDecl *TD) {
RedeclarableResult Redecl = VisitRedeclarable(TD);
VisitTypeDecl(TD);

TD->IdentifierNamespace = Record.readInt();
TD->setTagKind((TagDecl::TagKind)Record.readInt());
if (!isa<CXXRecordDecl>(TD))
  TD->setCompleteDefinition(Record.readInt());
TD->setEmbeddedInDeclarator(Record.readInt());
TD->setFreeStanding(Record.readInt());
TD->setCompleteDefinitionRequired(Record.readInt());
TD->setBraceRange(ReadSourceRange());

switch (Record.readInt()) {
case 0:
  break;
case 1: { // ExtInfo
  auto *Info = new (Reader.getContext()) TagDecl::ExtInfo();
  ReadQualifierInfo(*Info);
  TD->TypedefNameDeclOrQualifier = Info;
  break;
}
case 2: // TypedefNameForAnonDecl
  NamedDeclForTagDecl = ReadDeclID();
  TypedefNameForLinkage = Record.getIdentifierInfo();
  break;
default:
  llvm_unreachable("unexpected tag info kind")::llvm::llvm_unreachable_internal("unexpected tag info kind",
 "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 728);
}

if (!isa<CXXRecordDecl>(TD))
  mergeRedeclarable(TD, Redecl);
return Redecl;
734}

736void ASTDeclReader::VisitEnumDecl(EnumDecl *ED) {
VisitTagDecl(ED);
if (TypeSourceInfo *TI = GetTypeSourceInfo())
  ED->setIntegerTypeSourceInfo(TI);
else
  ED->setIntegerType(Record.readType());
ED->setPromotionType(Record.readType());
ED->setNumPositiveBits(Record.readInt());
ED->setNumNegativeBits(Record.readInt());
ED->IsScoped = Record.readInt();
ED->IsScopedUsingClassTag = Record.readInt();
ED->IsFixed = Record.readInt();

// If this is a definition subject to the ODR, and we already have a
// definition, merge this one into it.
if (ED->IsCompleteDefinition &&
    Reader.getContext().getLangOpts().Modules &&
    Reader.getContext().getLangOpts().CPlusPlus) {
  EnumDecl *&OldDef = Reader.EnumDefinitions[ED->getCanonicalDecl()];
  if (!OldDef) {
    // This is the first time we've seen an imported definition. Look for a
    // local definition before deciding that we are the first definition.
    for (auto *D : merged_redecls(ED->getCanonicalDecl())) {
      if (!D->isFromASTFile() && D->isCompleteDefinition()) {
        OldDef = D;
        break;
      }
    }
  }
  if (OldDef) {
    Reader.MergedDeclContexts.insert(std::make_pair(ED, OldDef));
    ED->IsCompleteDefinition = false;
    Reader.mergeDefinitionVisibility(OldDef, ED);
  } else {
    OldDef = ED;
  }
}

if (auto *InstED = ReadDeclAs<EnumDecl>()) {
  auto TSK = (TemplateSpecializationKind)Record.readInt();
  SourceLocation POI = ReadSourceLocation();
  ED->setInstantiationOfMemberEnum(Reader.getContext(), InstED, TSK);
  ED->getMemberSpecializationInfo()->setPointOfInstantiation(POI);
}
780}

782ASTDeclReader::RedeclarableResult
783ASTDeclReader::VisitRecordDeclImpl(RecordDecl *RD) {
RedeclarableResult Redecl = VisitTagDecl(RD);
RD->setHasFlexibleArrayMember(Record.readInt());
RD->setAnonymousStructOrUnion(Record.readInt());
RD->setHasObjectMember(Record.readInt());
RD->setHasVolatileMember(Record.readInt());
RD->setNonTrivialToPrimitiveDefaultInitialize(Record.readInt());
RD->setNonTrivialToPrimitiveCopy(Record.readInt());
RD->setNonTrivialToPrimitiveDestroy(Record.readInt());
RD->setParamDestroyedInCallee(Record.readInt());
RD->setArgPassingRestrictions((RecordDecl::ArgPassingKind)Record.readInt());
return Redecl;
795}

797void ASTDeclReader::VisitValueDecl(ValueDecl *VD) {
VisitNamedDecl(VD);
// For function declarations, defer reading the type in case the function has
// a deduced return type that references an entity declared within the
// function.
if (isa<FunctionDecl>(VD))
  DeferredTypeID = Record.getGlobalTypeID(Record.readInt());
else
  VD->setType(Record.readType());
806}

808void ASTDeclReader::VisitEnumConstantDecl(EnumConstantDecl *ECD) {
VisitValueDecl(ECD);
if (Record.readInt())
  ECD->setInitExpr(Record.readExpr());
ECD->setInitVal(Record.readAPSInt());
mergeMergeable(ECD);
814}

816void ASTDeclReader::VisitDeclaratorDecl(DeclaratorDecl *DD) {
VisitValueDecl(DD);
DD->setInnerLocStart(ReadSourceLocation());
if (Record.readInt()) { // hasExtInfo
  auto *Info = new (Reader.getContext()) DeclaratorDecl::ExtInfo();
  ReadQualifierInfo(*Info);
  DD->DeclInfo = Info;
}
QualType TSIType = Record.readType();
DD->setTypeSourceInfo(
    TSIType.isNull() ? nullptr
                     : Reader.getContext().CreateTypeSourceInfo(TSIType));
828}

830void ASTDeclReader::VisitFunctionDecl(FunctionDecl *FD) {
RedeclarableResult Redecl = VisitRedeclarable(FD);
VisitDeclaratorDecl(FD);

// Attach a type to this function. Use the real type if possible, but fall
// back to the type as written if it involves a deduced return type.
if (FD->getTypeSourceInfo() &&
    FD->getTypeSourceInfo()->getType()->castAs<FunctionType>()
                           ->getReturnType()->getContainedAutoType()) {
  // We'll set up the real type in Visit, once we've finished loading the
  // function.
  FD->setType(FD->getTypeSourceInfo()->getType());
} else {
  FD->setType(Reader.GetType(DeferredTypeID));
  DeferredTypeID = 0;
}

ReadDeclarationNameLoc(FD->DNLoc, FD->getDeclName());
FD->IdentifierNamespace = Record.readInt();

// FunctionDecl's body is handled last at ASTDeclReader::Visit,
// after everything else is read.

FD->SClass = (StorageClass)Record.readInt();
FD->IsInline = Record.readInt();
FD->IsInlineSpecified = Record.readInt();
FD->IsExplicitSpecified = Record.readInt();
FD->IsVirtualAsWritten = Record.readInt();
FD->IsPure = Record.readInt();
FD->HasInheritedPrototype = Record.readInt();
FD->HasWrittenPrototype = Record.readInt();
FD->IsDeleted = Record.readInt();
FD->IsTrivial = Record.readInt();
FD->IsTrivialForCall = Record.readInt();
FD->IsDefaulted = Record.readInt();
FD->IsExplicitlyDefaulted = Record.readInt();
FD->HasImplicitReturnZero = Record.readInt();
FD->IsConstexpr = Record.readInt();
FD->UsesSEHTry = Record.readInt();
FD->HasSkippedBody = Record.readInt();
FD->IsMultiVersion = Record.readInt();
FD->IsLateTemplateParsed = Record.readInt();
FD->setCachedLinkage(Linkage(Record.readInt()));
FD->EndRangeLoc = ReadSourceLocation();

FD->ODRHash = Record.readInt();
FD->HasODRHash = true;

switch ((FunctionDecl::TemplatedKind)Record.readInt()) {
case FunctionDecl::TK_NonTemplate:
  mergeRedeclarable(FD, Redecl);
  break;
case FunctionDecl::TK_FunctionTemplate:
  // Merged when we merge the template.
  FD->setDescribedFunctionTemplate(ReadDeclAs<FunctionTemplateDecl>());
  break;
case FunctionDecl::TK_MemberSpecialization: {
  auto *InstFD = ReadDeclAs<FunctionDecl>();
  auto TSK = (TemplateSpecializationKind)Record.readInt();
  SourceLocation POI = ReadSourceLocation();
  FD->setInstantiationOfMemberFunction(Reader.getContext(), InstFD, TSK);
  FD->getMemberSpecializationInfo()->setPointOfInstantiation(POI);
  mergeRedeclarable(FD, Redecl);
  break;
}
case FunctionDecl::TK_FunctionTemplateSpecialization: {
  auto *Template = ReadDeclAs<FunctionTemplateDecl>();
  auto TSK = (TemplateSpecializationKind)Record.readInt();

  // Template arguments.
  SmallVector<TemplateArgument, 8> TemplArgs;
  Record.readTemplateArgumentList(TemplArgs, /*Canonicalize*/ true);

  // Template args as written.
  SmallVector<TemplateArgumentLoc, 8> TemplArgLocs;
  SourceLocation LAngleLoc, RAngleLoc;
  bool HasTemplateArgumentsAsWritten = Record.readInt();
  if (HasTemplateArgumentsAsWritten) {
    unsigned NumTemplateArgLocs = Record.readInt();
    TemplArgLocs.reserve(NumTemplateArgLocs);
    for (unsigned i = 0; i != NumTemplateArgLocs; ++i)
      TemplArgLocs.push_back(Record.readTemplateArgumentLoc());

    LAngleLoc = ReadSourceLocation();
    RAngleLoc = ReadSourceLocation();
  }

  SourceLocation POI = ReadSourceLocation();

  ASTContext &C = Reader.getContext();
  TemplateArgumentList *TemplArgList
    = TemplateArgumentList::CreateCopy(C, TemplArgs);
  TemplateArgumentListInfo TemplArgsInfo(LAngleLoc, RAngleLoc);
  for (unsigned i = 0, e = TemplArgLocs.size(); i != e; ++i)
    TemplArgsInfo.addArgument(TemplArgLocs[i]);
  FunctionTemplateSpecializationInfo *FTInfo
      = FunctionTemplateSpecializationInfo::Create(C, FD, Template, TSK,
                                                   TemplArgList,
                           HasTemplateArgumentsAsWritten ? &TemplArgsInfo
                                                         : nullptr,
                                                   POI);
  FD->TemplateOrSpecialization = FTInfo;

  if (FD->isCanonicalDecl()) { // if canonical add to template's set.
    // The template that contains the specializations set. It's not safe to
    // use getCanonicalDecl on Template since it may still be initializing.
    auto *CanonTemplate = ReadDeclAs<FunctionTemplateDecl>();
    // Get the InsertPos by FindNodeOrInsertPos() instead of calling
    // InsertNode(FTInfo) directly to avoid the getASTContext() call in
    // FunctionTemplateSpecializationInfo's Profile().
    // We avoid getASTContext because a decl in the parent hierarchy may
    // be initializing.
    llvm::FoldingSetNodeID ID;
    FunctionTemplateSpecializationInfo::Profile(ID, TemplArgs, C);
    void *InsertPos = nullptr;
    FunctionTemplateDecl::Common *CommonPtr = CanonTemplate->getCommonPtr();
    FunctionTemplateSpecializationInfo *ExistingInfo =
        CommonPtr->Specializations.FindNodeOrInsertPos(ID, InsertPos);
    if (InsertPos)
      CommonPtr->Specializations.InsertNode(FTInfo, InsertPos);
    else {
      assert(Reader.getContext().getLangOpts().Modules &&(static_cast <bool> (Reader.getContext().getLangOpts().
Modules && "already deserialized this template specialization"
) ? void (0) : __assert_fail ("Reader.getContext().getLangOpts().Modules && \"already deserialized this template specialization\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 952, __extension__ __PRETTY_FUNCTION__))
             "already deserialized this template specialization")(static_cast <bool> (Reader.getContext().getLangOpts().
Modules && "already deserialized this template specialization"
) ? void (0) : __assert_fail ("Reader.getContext().getLangOpts().Modules && \"already deserialized this template specialization\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 952, __extension__ __PRETTY_FUNCTION__));
      mergeRedeclarable(FD, ExistingInfo->Function, Redecl);
    }
  }
  break;
}
case FunctionDecl::TK_DependentFunctionTemplateSpecialization: {
  // Templates.
  UnresolvedSet<8> TemplDecls;
  unsigned NumTemplates = Record.readInt();
  while (NumTemplates--)
    TemplDecls.addDecl(ReadDeclAs<NamedDecl>());

  // Templates args.
  TemplateArgumentListInfo TemplArgs;
  unsigned NumArgs = Record.readInt();
  while (NumArgs--)
    TemplArgs.addArgument(Record.readTemplateArgumentLoc());
  TemplArgs.setLAngleLoc(ReadSourceLocation());
  TemplArgs.setRAngleLoc(ReadSourceLocation());

  FD->setDependentTemplateSpecialization(Reader.getContext(),
                                         TemplDecls, TemplArgs);
  // These are not merged; we don't need to merge redeclarations of dependent
  // template friends.
  break;
}
}

// Read in the parameters.
unsigned NumParams = Record.readInt();
SmallVector<ParmVarDecl *, 16> Params;
Params.reserve(NumParams);
for (unsigned I = 0; I != NumParams; ++I)
  Params.push_back(ReadDeclAs<ParmVarDecl>());
FD->setParams(Reader.getContext(), Params);
988}

990void ASTDeclReader::VisitObjCMethodDecl(ObjCMethodDecl *MD) {
VisitNamedDecl(MD);
if (Record.readInt()) {
  // Load the body on-demand. Most clients won't care, because method
  // definitions rarely show up in headers.
  Reader.PendingBodies[MD] = GetCurrentCursorOffset();
  HasPendingBody = true;
  MD->setSelfDecl(ReadDeclAs<ImplicitParamDecl>());
  MD->setCmdDecl(ReadDeclAs<ImplicitParamDecl>());
}
MD->setInstanceMethod(Record.readInt());
MD->setVariadic(Record.readInt());
MD->setPropertyAccessor(Record.readInt());
MD->setDefined(Record.readInt());
MD->IsOverriding = Record.readInt();
MD->HasSkippedBody = Record.readInt();

MD->IsRedeclaration = Record.readInt();
MD->HasRedeclaration = Record.readInt();
if (MD->HasRedeclaration)
  Reader.getContext().setObjCMethodRedeclaration(MD,
                                     ReadDeclAs<ObjCMethodDecl>());

MD->setDeclImplementation((ObjCMethodDecl::ImplementationControl)Record.readInt());
MD->setObjCDeclQualifier((Decl::ObjCDeclQualifier)Record.readInt());
MD->SetRelatedResultType(Record.readInt());
MD->setReturnType(Record.readType());
MD->setReturnTypeSourceInfo(GetTypeSourceInfo());
MD->DeclEndLoc = ReadSourceLocation();
unsigned NumParams = Record.readInt();
SmallVector<ParmVarDecl *, 16> Params;
Params.reserve(NumParams);
for (unsigned I = 0; I != NumParams; ++I)
  Params.push_back(ReadDeclAs<ParmVarDecl>());

MD->SelLocsKind = Record.readInt();
unsigned NumStoredSelLocs = Record.readInt();
SmallVector<SourceLocation, 16> SelLocs;
SelLocs.reserve(NumStoredSelLocs);
for (unsigned i = 0; i != NumStoredSelLocs; ++i)
  SelLocs.push_back(ReadSourceLocation());

MD->setParamsAndSelLocs(Reader.getContext(), Params, SelLocs);
1033}

1035void ASTDeclReader::VisitObjCTypeParamDecl(ObjCTypeParamDecl *D) {
VisitTypedefNameDecl(D);

D->Variance = Record.readInt();
D->Index = Record.readInt();
D->VarianceLoc = ReadSourceLocation();
D->ColonLoc = ReadSourceLocation();
1042}

1044void ASTDeclReader::VisitObjCContainerDecl(ObjCContainerDecl *CD) {
VisitNamedDecl(CD);
CD->setAtStartLoc(ReadSourceLocation());
CD->setAtEndRange(ReadSourceRange());
1048}

1050ObjCTypeParamList *ASTDeclReader::ReadObjCTypeParamList() {
unsigned numParams = Record.readInt();
if (numParams == 0)
  return nullptr;

SmallVector<ObjCTypeParamDecl *, 4> typeParams;
typeParams.reserve(numParams);
for (unsigned i = 0; i != numParams; ++i) {
  auto *typeParam = ReadDeclAs<ObjCTypeParamDecl>();
  if (!typeParam)
    return nullptr;

  typeParams.push_back(typeParam);
}

SourceLocation lAngleLoc = ReadSourceLocation();
SourceLocation rAngleLoc = ReadSourceLocation();

return ObjCTypeParamList::create(Reader.getContext(), lAngleLoc,
                                 typeParams, rAngleLoc);
1070}

1072void ASTDeclReader::ReadObjCDefinitionData(
       struct ObjCInterfaceDecl::DefinitionData &Data) {
// Read the superclass.
Data.SuperClassTInfo = GetTypeSourceInfo();

Data.EndLoc = ReadSourceLocation();
Data.HasDesignatedInitializers = Record.readInt();

// Read the directly referenced protocols and their SourceLocations.
unsigned NumProtocols = Record.readInt();
SmallVector<ObjCProtocolDecl *, 16> Protocols;
Protocols.reserve(NumProtocols);
for (unsigned I = 0; I != NumProtocols; ++I)
  Protocols.push_back(ReadDeclAs<ObjCProtocolDecl>());
SmallVector<SourceLocation, 16> ProtoLocs;
ProtoLocs.reserve(NumProtocols);
for (unsigned I = 0; I != NumProtocols; ++I)
  ProtoLocs.push_back(ReadSourceLocation());
Data.ReferencedProtocols.set(Protocols.data(), NumProtocols, ProtoLocs.data(),
                             Reader.getContext());

// Read the transitive closure of protocols referenced by this class.
NumProtocols = Record.readInt();
Protocols.clear();
Protocols.reserve(NumProtocols);
for (unsigned I = 0; I != NumProtocols; ++I)
  Protocols.push_back(ReadDeclAs<ObjCProtocolDecl>());
Data.AllReferencedProtocols.set(Protocols.data(), NumProtocols,
                                Reader.getContext());
1101}

1103void ASTDeclReader::MergeDefinitionData(ObjCInterfaceDecl *D,
       struct ObjCInterfaceDecl::DefinitionData &&NewDD) {
// FIXME: odr checking?
1106}

1108void ASTDeclReader::VisitObjCInterfaceDecl(ObjCInterfaceDecl *ID) {
RedeclarableResult Redecl = VisitRedeclarable(ID);
VisitObjCContainerDecl(ID);
DeferredTypeID = Record.getGlobalTypeID(Record.readInt());
mergeRedeclarable(ID, Redecl);

ID->TypeParamList = ReadObjCTypeParamList();
if (Record.readInt()) {
  // Read the definition.
  ID->allocateDefinitionData();

  ReadObjCDefinitionData(ID->data());
  ObjCInterfaceDecl *Canon = ID->getCanonicalDecl();
  if (Canon->Data.getPointer()) {
    // If we already have a definition, keep the definition invariant and
    // merge the data.
    MergeDefinitionData(Canon, std::move(ID->data()));
    ID->Data = Canon->Data;
  } else {
    // Set the definition data of the canonical declaration, so other
    // redeclarations will see it.
    ID->getCanonicalDecl()->Data = ID->Data;

    // We will rebuild this list lazily.
    ID->setIvarList(nullptr);
  }

  // Note that we have deserialized a definition.
  Reader.PendingDefinitions.insert(ID);

  // Note that we've loaded this Objective-C class.
  Reader.ObjCClassesLoaded.push_back(ID);
} else {
  ID->Data = ID->getCanonicalDecl()->Data;
}
1143}

1145void ASTDeclReader::VisitObjCIvarDecl(ObjCIvarDecl *IVD) {
VisitFieldDecl(IVD);
IVD->setAccessControl((ObjCIvarDecl::AccessControl)Record.readInt());
// This field will be built lazily.
IVD->setNextIvar(nullptr);
bool synth = Record.readInt();
IVD->setSynthesize(synth);
1152}

1154void ASTDeclReader::ReadObjCDefinitionData(
       struct ObjCProtocolDecl::DefinitionData &Data) {
  unsigned NumProtoRefs = Record.readInt();
  SmallVector<ObjCProtocolDecl *, 16> ProtoRefs;
  ProtoRefs.reserve(NumProtoRefs);
  for (unsigned I = 0; I != NumProtoRefs; ++I)
    ProtoRefs.push_back(ReadDeclAs<ObjCProtocolDecl>());
  SmallVector<SourceLocation, 16> ProtoLocs;
  ProtoLocs.reserve(NumProtoRefs);
  for (unsigned I = 0; I != NumProtoRefs; ++I)
    ProtoLocs.push_back(ReadSourceLocation());
  Data.ReferencedProtocols.set(ProtoRefs.data(), NumProtoRefs,
                               ProtoLocs.data(), Reader.getContext());
1167}

1169void ASTDeclReader::MergeDefinitionData(ObjCProtocolDecl *D,
       struct ObjCProtocolDecl::DefinitionData &&NewDD) {
// FIXME: odr checking?
1172}

1174void ASTDeclReader::VisitObjCProtocolDecl(ObjCProtocolDecl *PD) {
RedeclarableResult Redecl = VisitRedeclarable(PD);
VisitObjCContainerDecl(PD);
mergeRedeclarable(PD, Redecl);

if (Record.readInt()) {
  // Read the definition.
  PD->allocateDefinitionData();

  ReadObjCDefinitionData(PD->data());

  ObjCProtocolDecl *Canon = PD->getCanonicalDecl();
  if (Canon->Data.getPointer()) {
    // If we already have a definition, keep the definition invariant and
    // merge the data.
    MergeDefinitionData(Canon, std::move(PD->data()));
    PD->Data = Canon->Data;
  } else {
    // Set the definition data of the canonical declaration, so other
    // redeclarations will see it.
    PD->getCanonicalDecl()->Data = PD->Data;
  }
  // Note that we have deserialized a definition.
  Reader.PendingDefinitions.insert(PD);
} else {
  PD->Data = PD->getCanonicalDecl()->Data;
}
1201}

1203void ASTDeclReader::VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *FD) {
VisitFieldDecl(FD);
1205}

1207void ASTDeclReader::VisitObjCCategoryDecl(ObjCCategoryDecl *CD) {
VisitObjCContainerDecl(CD);
CD->setCategoryNameLoc(ReadSourceLocation());
CD->setIvarLBraceLoc(ReadSourceLocation());
CD->setIvarRBraceLoc(ReadSourceLocation());

// Note that this category has been deserialized. We do this before
// deserializing the interface declaration, so that it will consider this
/// category.
Reader.CategoriesDeserialized.insert(CD);

CD->ClassInterface = ReadDeclAs<ObjCInterfaceDecl>();
CD->TypeParamList = ReadObjCTypeParamList();
unsigned NumProtoRefs = Record.readInt();
SmallVector<ObjCProtocolDecl *, 16> ProtoRefs;
ProtoRefs.reserve(NumProtoRefs);
for (unsigned I = 0; I != NumProtoRefs; ++I)
  ProtoRefs.push_back(ReadDeclAs<ObjCProtocolDecl>());
SmallVector<SourceLocation, 16> ProtoLocs;
ProtoLocs.reserve(NumProtoRefs);
for (unsigned I = 0; I != NumProtoRefs; ++I)
  ProtoLocs.push_back(ReadSourceLocation());
CD->setProtocolList(ProtoRefs.data(), NumProtoRefs, ProtoLocs.data(),
                    Reader.getContext());

// Protocols in the class extension belong to the class.
if (NumProtoRefs > 0 && CD->ClassInterface && CD->IsClassExtension())
  CD->ClassInterface->mergeClassExtensionProtocolList(
      (ObjCProtocolDecl *const *)ProtoRefs.data(), NumProtoRefs,
      Reader.getContext());
1237}

1239void ASTDeclReader::VisitObjCCompatibleAliasDecl(ObjCCompatibleAliasDecl *CAD) {
VisitNamedDecl(CAD);
CAD->setClassInterface(ReadDeclAs<ObjCInterfaceDecl>());
1242}

1244void ASTDeclReader::VisitObjCPropertyDecl(ObjCPropertyDecl *D) {
VisitNamedDecl(D);
D->setAtLoc(ReadSourceLocation());
D->setLParenLoc(ReadSourceLocation());
QualType T = Record.readType();
TypeSourceInfo *TSI = GetTypeSourceInfo();
D->setType(T, TSI);
D->setPropertyAttributes(
    (ObjCPropertyDecl::PropertyAttributeKind)Record.readInt());
D->setPropertyAttributesAsWritten(
    (ObjCPropertyDecl::PropertyAttributeKind)Record.readInt());
D->setPropertyImplementation(
    (ObjCPropertyDecl::PropertyControl)Record.readInt());
DeclarationName GetterName = Record.readDeclarationName();
SourceLocation GetterLoc = ReadSourceLocation();
D->setGetterName(GetterName.getObjCSelector(), GetterLoc);
DeclarationName SetterName = Record.readDeclarationName();
SourceLocation SetterLoc = ReadSourceLocation();
D->setSetterName(SetterName.getObjCSelector(), SetterLoc);
D->setGetterMethodDecl(ReadDeclAs<ObjCMethodDecl>());
D->setSetterMethodDecl(ReadDeclAs<ObjCMethodDecl>());
D->setPropertyIvarDecl(ReadDeclAs<ObjCIvarDecl>());
1266}

1268void ASTDeclReader::VisitObjCImplDecl(ObjCImplDecl *D) {
VisitObjCContainerDecl(D);
D->setClassInterface(ReadDeclAs<ObjCInterfaceDecl>());
1271}

1273void ASTDeclReader::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D) {
VisitObjCImplDecl(D);
D->CategoryNameLoc = ReadSourceLocation();
1276}

1278void ASTDeclReader::VisitObjCImplementationDecl(ObjCImplementationDecl *D) {
VisitObjCImplDecl(D);
D->setSuperClass(ReadDeclAs<ObjCInterfaceDecl>());
D->SuperLoc = ReadSourceLocation();
D->setIvarLBraceLoc(ReadSourceLocation());
D->setIvarRBraceLoc(ReadSourceLocation());
D->setHasNonZeroConstructors(Record.readInt());
D->setHasDestructors(Record.readInt());
D->NumIvarInitializers = Record.readInt();
if (D->NumIvarInitializers)
  D->IvarInitializers = ReadGlobalOffset();
1289}

1291void ASTDeclReader::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D) {
VisitDecl(D);
D->setAtLoc(ReadSourceLocation());
D->setPropertyDecl(ReadDeclAs<ObjCPropertyDecl>());
D->PropertyIvarDecl = ReadDeclAs<ObjCIvarDecl>();
D->IvarLoc = ReadSourceLocation();
D->setGetterCXXConstructor(Record.readExpr());
D->setSetterCXXAssignment(Record.readExpr());
1299}

1301void ASTDeclReader::VisitFieldDecl(FieldDecl *FD) {
VisitDeclaratorDecl(FD);
FD->Mutable = Record.readInt();

if (auto ISK = static_cast<FieldDecl::InitStorageKind>(Record.readInt())) {
  FD->InitStorage.setInt(ISK);
  FD->InitStorage.setPointer(ISK == FieldDecl::ISK_CapturedVLAType
                                 ? Record.readType().getAsOpaquePtr()
                                 : Record.readExpr());
}

if (auto *BW = Record.readExpr())
  FD->setBitWidth(BW);

if (!FD->getDeclName()) {
  if (auto *Tmpl = ReadDeclAs<FieldDecl>())
    Reader.getContext().setInstantiatedFromUnnamedFieldDecl(FD, Tmpl);
}
mergeMergeable(FD);
1320}

1322void ASTDeclReader::VisitMSPropertyDecl(MSPropertyDecl *PD) {
VisitDeclaratorDecl(PD);
PD->GetterId = Record.getIdentifierInfo();
PD->SetterId = Record.getIdentifierInfo();
1326}

1328void ASTDeclReader::VisitIndirectFieldDecl(IndirectFieldDecl *FD) {
VisitValueDecl(FD);

FD->ChainingSize = Record.readInt();
assert(FD->ChainingSize >= 2 && "Anonymous chaining must be >= 2")(static_cast <bool> (FD->ChainingSize >= 2 &&
 "Anonymous chaining must be >= 2") ? void (0) : __assert_fail
 ("FD->ChainingSize >= 2 && \"Anonymous chaining must be >= 2\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 1332, __extension__ __PRETTY_FUNCTION__));
FD->Chaining = new (Reader.getContext())NamedDecl*[FD->ChainingSize];

for (unsigned I = 0; I != FD->ChainingSize; ++I)
  FD->Chaining[I] = ReadDeclAs<NamedDecl>();

mergeMergeable(FD);
1339}

1341ASTDeclReader::RedeclarableResult ASTDeclReader::VisitVarDeclImpl(VarDecl *VD) {
RedeclarableResult Redecl = VisitRedeclarable(VD);
VisitDeclaratorDecl(VD);

VD->VarDeclBits.SClass = (StorageClass)Record.readInt();
VD->VarDeclBits.TSCSpec = Record.readInt();
VD->VarDeclBits.InitStyle = Record.readInt();
if (!isa<ParmVarDecl>(VD)) {
  VD->NonParmVarDeclBits.IsThisDeclarationADemotedDefinition =
      Record.readInt();
  VD->NonParmVarDeclBits.ExceptionVar = Record.readInt();
  VD->NonParmVarDeclBits.NRVOVariable = Record.readInt();
  VD->NonParmVarDeclBits.CXXForRangeDecl = Record.readInt();
  VD->NonParmVarDeclBits.ObjCForDecl = Record.readInt();
  VD->NonParmVarDeclBits.ARCPseudoStrong = Record.readInt();
  VD->NonParmVarDeclBits.IsInline = Record.readInt();
  VD->NonParmVarDeclBits.IsInlineSpecified = Record.readInt();
  VD->NonParmVarDeclBits.IsConstexpr = Record.readInt();
  VD->NonParmVarDeclBits.IsInitCapture = Record.readInt();
  VD->NonParmVarDeclBits.PreviousDeclInSameBlockScope = Record.readInt();
  VD->NonParmVarDeclBits.ImplicitParamKind = Record.readInt();
}
auto VarLinkage = Linkage(Record.readInt());
VD->setCachedLinkage(VarLinkage);

// Reconstruct the one piece of the IdentifierNamespace that we need.
if (VD->getStorageClass() == SC_Extern && VarLinkage != NoLinkage &&
    VD->getLexicalDeclContext()->isFunctionOrMethod())
  VD->setLocalExternDecl();

if (uint64_t Val = Record.readInt()) {
  VD->setInit(Record.readExpr());
  if (Val > 1) { // IsInitKnownICE = 1, IsInitNotICE = 2, IsInitICE = 3
    EvaluatedStmt *Eval = VD->ensureEvaluatedStmt();
    Eval->CheckedICE = true;
    Eval->IsICE = Val == 3;
  }
}

if (VD->getStorageDuration() == SD_Static && Record.readInt())
  Reader.DefinitionSource[VD] = Loc.F->Kind == ModuleKind::MK_MainFile;

enum VarKind {
  VarNotTemplate = 0, VarTemplate, StaticDataMemberSpecialization
};
switch ((VarKind)Record.readInt()) {
case VarNotTemplate:
  // Only true variables (not parameters or implicit parameters) can be
  // merged; the other kinds are not really redeclarable at all.
  if (!isa<ParmVarDecl>(VD) && !isa<ImplicitParamDecl>(VD) &&
      !isa<VarTemplateSpecializationDecl>(VD))
    mergeRedeclarable(VD, Redecl);
  break;
case VarTemplate:
  // Merged when we merge the template.
  VD->setDescribedVarTemplate(ReadDeclAs<VarTemplateDecl>());
  break;
case StaticDataMemberSpecialization: { // HasMemberSpecializationInfo.
  auto *Tmpl = ReadDeclAs<VarDecl>();
  auto TSK = (TemplateSpecializationKind)Record.readInt();
  SourceLocation POI = ReadSourceLocation();
  Reader.getContext().setInstantiatedFromStaticDataMember(VD, Tmpl, TSK,POI);
  mergeRedeclarable(VD, Redecl);
  break;
}
}

return Redecl;
1409}

1411void ASTDeclReader::VisitImplicitParamDecl(ImplicitParamDecl *PD) {
VisitVarDecl(PD);
1413}

1415void ASTDeclReader::VisitParmVarDecl(ParmVarDecl *PD) {
VisitVarDecl(PD);
unsigned isObjCMethodParam = Record.readInt();
unsigned scopeDepth = Record.readInt();
unsigned scopeIndex = Record.readInt();
unsigned declQualifier = Record.readInt();
if (isObjCMethodParam) {
  assert(scopeDepth == 0)(static_cast <bool> (scopeDepth == 0) ? void (0) : __assert_fail
 ("scopeDepth == 0", "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 1422, __extension__ __PRETTY_FUNCTION__));
  PD->setObjCMethodScopeInfo(scopeIndex);
  PD->ParmVarDeclBits.ScopeDepthOrObjCQuals = declQualifier;
} else {
  PD->setScopeInfo(scopeDepth, scopeIndex);
}
PD->ParmVarDeclBits.IsKNRPromoted = Record.readInt();
PD->ParmVarDeclBits.HasInheritedDefaultArg = Record.readInt();
if (Record.readInt()) // hasUninstantiatedDefaultArg.
  PD->setUninstantiatedDefaultArg(Record.readExpr());

// FIXME: If this is a redeclaration of a function from another module, handle
// inheritance of default arguments.
1435}

1437void ASTDeclReader::VisitDecompositionDecl(DecompositionDecl *DD) {
VisitVarDecl(DD);
auto **BDs = DD->getTrailingObjects<BindingDecl *>();
for (unsigned I = 0; I != DD->NumBindings; ++I)
  BDs[I] = ReadDeclAs<BindingDecl>();
1442}

1444void ASTDeclReader::VisitBindingDecl(BindingDecl *BD) {
VisitValueDecl(BD);
BD->Binding = Record.readExpr();
1447}

1449void ASTDeclReader::VisitFileScopeAsmDecl(FileScopeAsmDecl *AD) {
VisitDecl(AD);
AD->setAsmString(cast<StringLiteral>(Record.readExpr()));
AD->setRParenLoc(ReadSourceLocation());
1453}

1455void ASTDeclReader::VisitBlockDecl(BlockDecl *BD) {
VisitDecl(BD);
BD->setBody(cast_or_null<CompoundStmt>(Record.readStmt()));
BD->setSignatureAsWritten(GetTypeSourceInfo());
unsigned NumParams = Record.readInt();
SmallVector<ParmVarDecl *, 16> Params;
Params.reserve(NumParams);
for (unsigned I = 0; I != NumParams; ++I)
  Params.push_back(ReadDeclAs<ParmVarDecl>());
BD->setParams(Params);

BD->setIsVariadic(Record.readInt());
BD->setBlockMissingReturnType(Record.readInt());
BD->setIsConversionFromLambda(Record.readInt());

bool capturesCXXThis = Record.readInt();
unsigned numCaptures = Record.readInt();
SmallVector<BlockDecl::Capture, 16> captures;
captures.reserve(numCaptures);
for (unsigned i = 0; i != numCaptures; ++i) {
  auto *decl = ReadDeclAs<VarDecl>();
  unsigned flags = Record.readInt();
  bool byRef = (flags & 1);
  bool nested = (flags & 2);
  Expr *copyExpr = ((flags & 4) ? Record.readExpr() : nullptr);

  captures.push_back(BlockDecl::Capture(decl, byRef, nested, copyExpr));
}
BD->setCaptures(Reader.getContext(), captures, capturesCXXThis);
1484}

1486void ASTDeclReader::VisitCapturedDecl(CapturedDecl *CD) {
VisitDecl(CD);
unsigned ContextParamPos = Record.readInt();
CD->setNothrow(Record.readInt() != 0);
// Body is set by VisitCapturedStmt.
for (unsigned I = 0; I < CD->NumParams; ++I) {
  if (I != ContextParamPos)
    CD->setParam(I, ReadDeclAs<ImplicitParamDecl>());
  else
    CD->setContextParam(I, ReadDeclAs<ImplicitParamDecl>());
}
1497}

1499void ASTDeclReader::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
VisitDecl(D);
D->setLanguage((LinkageSpecDecl::LanguageIDs)Record.readInt());
D->setExternLoc(ReadSourceLocation());
D->setRBraceLoc(ReadSourceLocation());
1504}

1506void ASTDeclReader::VisitExportDecl(ExportDecl *D) {
VisitDecl(D);
D->RBraceLoc = ReadSourceLocation();
1509}

1511void ASTDeclReader::VisitLabelDecl(LabelDecl *D) {
VisitNamedDecl(D);
D->setLocStart(ReadSourceLocation());
1514}

1516void ASTDeclReader::VisitNamespaceDecl(NamespaceDecl *D) {
RedeclarableResult Redecl = VisitRedeclarable(D);
VisitNamedDecl(D);
D->setInline(Record.readInt());
D->LocStart = ReadSourceLocation();
D->RBraceLoc = ReadSourceLocation();

// Defer loading the anonymous namespace until we've finished merging
// this namespace; loading it might load a later declaration of the
// same namespace, and we have an invariant that older declarations
// get merged before newer ones try to merge.
GlobalDeclID AnonNamespace = 0;
if (Redecl.getFirstID() == ThisDeclID) {
  AnonNamespace = ReadDeclID();
} else {
  // Link this namespace back to the first declaration, which has already
  // been deserialized.
  D->AnonOrFirstNamespaceAndInline.setPointer(D->getFirstDecl());
}

mergeRedeclarable(D, Redecl);

if (AnonNamespace) {
  // Each module has its own anonymous namespace, which is disjoint from
  // any other module's anonymous namespaces, so don't attach the anonymous
  // namespace at all.
  auto *Anon = cast<NamespaceDecl>(Reader.GetDecl(AnonNamespace));
  if (!Record.isModule())
    D->setAnonymousNamespace(Anon);
}
1546}

1548void ASTDeclReader::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
RedeclarableResult Redecl = VisitRedeclarable(D);
VisitNamedDecl(D);
D->NamespaceLoc = ReadSourceLocation();
D->IdentLoc = ReadSourceLocation();
D->QualifierLoc = Record.readNestedNameSpecifierLoc();
D->Namespace = ReadDeclAs<NamedDecl>();
mergeRedeclarable(D, Redecl);
1556}

1558void ASTDeclReader::VisitUsingDecl(UsingDecl *D) {
VisitNamedDecl(D);
D->setUsingLoc(ReadSourceLocation());
D->QualifierLoc = Record.readNestedNameSpecifierLoc();
ReadDeclarationNameLoc(D->DNLoc, D->getDeclName());
D->FirstUsingShadow.setPointer(ReadDeclAs<UsingShadowDecl>());
D->setTypename(Record.readInt());
if (auto *Pattern = ReadDeclAs<NamedDecl>())
  Reader.getContext().setInstantiatedFromUsingDecl(D, Pattern);
mergeMergeable(D);
1568}

1570void ASTDeclReader::VisitUsingPackDecl(UsingPackDecl *D) {
VisitNamedDecl(D);
D->InstantiatedFrom = ReadDeclAs<NamedDecl>();
auto **Expansions = D->getTrailingObjects<NamedDecl *>();
for (unsigned I = 0; I != D->NumExpansions; ++I)
  Expansions[I] = ReadDeclAs<NamedDecl>();
mergeMergeable(D);
1577}

1579void ASTDeclReader::VisitUsingShadowDecl(UsingShadowDecl *D) {
RedeclarableResult Redecl = VisitRedeclarable(D);
VisitNamedDecl(D);
D->Underlying = ReadDeclAs<NamedDecl>();
D->IdentifierNamespace = Record.readInt();
D->UsingOrNextShadow = ReadDeclAs<NamedDecl>();
auto *Pattern = ReadDeclAs<UsingShadowDecl>();
if (Pattern)
  Reader.getContext().setInstantiatedFromUsingShadowDecl(D, Pattern);
mergeRedeclarable(D, Redecl);
1589}

1591void ASTDeclReader::VisitConstructorUsingShadowDecl(
  ConstructorUsingShadowDecl *D) {
VisitUsingShadowDecl(D);
D->NominatedBaseClassShadowDecl = ReadDeclAs<ConstructorUsingShadowDecl>();
D->ConstructedBaseClassShadowDecl = ReadDeclAs<ConstructorUsingShadowDecl>();
D->IsVirtual = Record.readInt();
1597}

1599void ASTDeclReader::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
VisitNamedDecl(D);
D->UsingLoc = ReadSourceLocation();
D->NamespaceLoc = ReadSourceLocation();
D->QualifierLoc = Record.readNestedNameSpecifierLoc();
D->NominatedNamespace = ReadDeclAs<NamedDecl>();
D->CommonAncestor = ReadDeclAs<DeclContext>();
1606}

1608void ASTDeclReader::VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D) {
VisitValueDecl(D);
D->setUsingLoc(ReadSourceLocation());
D->QualifierLoc = Record.readNestedNameSpecifierLoc();
ReadDeclarationNameLoc(D->DNLoc, D->getDeclName());
D->EllipsisLoc = ReadSourceLocation();
mergeMergeable(D);
1615}

1617void ASTDeclReader::VisitUnresolvedUsingTypenameDecl(
                                             UnresolvedUsingTypenameDecl *D) {
VisitTypeDecl(D);
D->TypenameLocation = ReadSourceLocation();
D->QualifierLoc = Record.readNestedNameSpecifierLoc();
D->EllipsisLoc = ReadSourceLocation();
mergeMergeable(D);
1624}

1626void ASTDeclReader::ReadCXXDefinitionData(
  struct CXXRecordDecl::DefinitionData &Data, const CXXRecordDecl *D) {
// Note: the caller has deserialized the IsLambda bit already.
Data.UserDeclaredConstructor = Record.readInt();
Data.UserDeclaredSpecialMembers = Record.readInt();
Data.Aggregate = Record.readInt();
Data.PlainOldData = Record.readInt();
Data.Empty = Record.readInt();
Data.Polymorphic = Record.readInt();
Data.Abstract = Record.readInt();
Data.IsStandardLayout = Record.readInt();
Data.IsCXX11StandardLayout = Record.readInt();
Data.HasBasesWithFields = Record.readInt();
Data.HasBasesWithNonStaticDataMembers = Record.readInt();
Data.HasPrivateFields = Record.readInt();
Data.HasProtectedFields = Record.readInt();
Data.HasPublicFields = Record.readInt();
Data.HasMutableFields = Record.readInt();
Data.HasVariantMembers = Record.readInt();
Data.HasOnlyCMembers = Record.readInt();
Data.HasInClassInitializer = Record.readInt();
Data.HasUninitializedReferenceMember = Record.readInt();
Data.HasUninitializedFields = Record.readInt();
Data.HasInheritedConstructor = Record.readInt();
Data.HasInheritedAssignment = Record.readInt();
Data.NeedOverloadResolutionForCopyConstructor = Record.readInt();
Data.NeedOverloadResolutionForMoveConstructor = Record.readInt();
Data.NeedOverloadResolutionForMoveAssignment = Record.readInt();
Data.NeedOverloadResolutionForDestructor = Record.readInt();
Data.DefaultedCopyConstructorIsDeleted = Record.readInt();
Data.DefaultedMoveConstructorIsDeleted = Record.readInt();
Data.DefaultedMoveAssignmentIsDeleted = Record.readInt();
Data.DefaultedDestructorIsDeleted = Record.readInt();
Data.HasTrivialSpecialMembers = Record.readInt();
Data.HasTrivialSpecialMembersForCall = Record.readInt();
Data.DeclaredNonTrivialSpecialMembers = Record.readInt();
Data.DeclaredNonTrivialSpecialMembersForCall = Record.readInt();
Data.HasIrrelevantDestructor = Record.readInt();
Data.HasConstexprNonCopyMoveConstructor = Record.readInt();
Data.HasDefaultedDefaultConstructor = Record.readInt();
Data.DefaultedDefaultConstructorIsConstexpr = Record.readInt();
Data.HasConstexprDefaultConstructor = Record.readInt();
Data.HasNonLiteralTypeFieldsOrBases = Record.readInt();
Data.ComputedVisibleConversions = Record.readInt();
Data.UserProvidedDefaultConstructor = Record.readInt();
Data.DeclaredSpecialMembers = Record.readInt();
Data.ImplicitCopyConstructorCanHaveConstParamForVBase = Record.readInt();
Data.ImplicitCopyConstructorCanHaveConstParamForNonVBase = Record.readInt();
Data.ImplicitCopyAssignmentHasConstParam = Record.readInt();
Data.HasDeclaredCopyConstructorWithConstParam = Record.readInt();
Data.HasDeclaredCopyAssignmentWithConstParam = Record.readInt();
Data.ODRHash = Record.readInt();
Data.HasODRHash = true;

if (Record.readInt())
  Reader.DefinitionSource[D] = Loc.F->Kind == ModuleKind::MK_MainFile;

Data.NumBases = Record.readInt();
if (Data.NumBases)
  Data.Bases = ReadGlobalOffset();
Data.NumVBases = Record.readInt();
if (Data.NumVBases)
  Data.VBases = ReadGlobalOffset();

Record.readUnresolvedSet(Data.Conversions);
Record.readUnresolvedSet(Data.VisibleConversions);
assert(Data.Definition && "Data.Definition should be already set!")(static_cast <bool> (Data.Definition && "Data.Definition should be already set!"
) ? void (0) : __assert_fail ("Data.Definition && \"Data.Definition should be already set!\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 1692, __extension__ __PRETTY_FUNCTION__));
Data.FirstFriend = ReadDeclID();

if (Data.IsLambda) {
  using Capture = LambdaCapture;

  auto &Lambda = static_cast<CXXRecordDecl::LambdaDefinitionData &>(Data);
  Lambda.Dependent = Record.readInt();
  Lambda.IsGenericLambda = Record.readInt();
  Lambda.CaptureDefault = Record.readInt();
  Lambda.NumCaptures = Record.readInt();
  Lambda.NumExplicitCaptures = Record.readInt();
  Lambda.ManglingNumber = Record.readInt();
  Lambda.ContextDecl = ReadDeclID();
  Lambda.Captures = (Capture *)Reader.getContext().Allocate(
      sizeof(Capture) * Lambda.NumCaptures);
  Capture *ToCapture = Lambda.Captures;
  Lambda.MethodTyInfo = GetTypeSourceInfo();
  for (unsigned I = 0, N = Lambda.NumCaptures; I != N; ++I) {
    SourceLocation Loc = ReadSourceLocation();
    bool IsImplicit = Record.readInt();
    auto Kind = static_cast<LambdaCaptureKind>(Record.readInt());
    switch (Kind) {
    case LCK_StarThis: 
    case LCK_This:
    case LCK_VLAType:
      *ToCapture++ = Capture(Loc, IsImplicit, Kind, nullptr,SourceLocation());
      break;
    case LCK_ByCopy:
    case LCK_ByRef:
      auto *Var = ReadDeclAs<VarDecl>();
      SourceLocation EllipsisLoc = ReadSourceLocation();
      *ToCapture++ = Capture(Loc, IsImplicit, Kind, Var, EllipsisLoc);
      break;
    }
  }
}
1729}

1731void ASTDeclReader::MergeDefinitionData(
  CXXRecordDecl *D, struct CXXRecordDecl::DefinitionData &&MergeDD) {
assert(D->DefinitionData &&(static_cast <bool> (D->DefinitionData && "merging class definition into non-definition"
) ? void (0) : __assert_fail ("D->DefinitionData && \"merging class definition into non-definition\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 1734, __extension__ __PRETTY_FUNCTION__))
       "merging class definition into non-definition")(static_cast <bool> (D->DefinitionData && "merging class definition into non-definition"
) ? void (0) : __assert_fail ("D->DefinitionData && \"merging class definition into non-definition\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 1734, __extension__ __PRETTY_FUNCTION__));
auto &DD = *D->DefinitionData;

if (DD.Definition != MergeDD.Definition) {
  // Track that we merged the definitions.
  Reader.MergedDeclContexts.insert(std::make_pair(MergeDD.Definition,
                                                  DD.Definition));
  Reader.PendingDefinitions.erase(MergeDD.Definition);
  MergeDD.Definition->IsCompleteDefinition = false;
  Reader.mergeDefinitionVisibility(DD.Definition, MergeDD.Definition);
  assert(Reader.Lookups.find(MergeDD.Definition) == Reader.Lookups.end() &&(static_cast <bool> (Reader.Lookups.find(MergeDD.Definition
) == Reader.Lookups.end() && "already loaded pending lookups for merged definition"
) ? void (0) : __assert_fail ("Reader.Lookups.find(MergeDD.Definition) == Reader.Lookups.end() && \"already loaded pending lookups for merged definition\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 1745, __extension__ __PRETTY_FUNCTION__))
         "already loaded pending lookups for merged definition")(static_cast <bool> (Reader.Lookups.find(MergeDD.Definition
) == Reader.Lookups.end() && "already loaded pending lookups for merged definition"
) ? void (0) : __assert_fail ("Reader.Lookups.find(MergeDD.Definition) == Reader.Lookups.end() && \"already loaded pending lookups for merged definition\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 1745, __extension__ __PRETTY_FUNCTION__));
}

auto PFDI = Reader.PendingFakeDefinitionData.find(&DD);
if (PFDI != Reader.PendingFakeDefinitionData.end() &&
    PFDI->second == ASTReader::PendingFakeDefinitionKind::Fake) {
  // We faked up this definition data because we found a class for which we'd
  // not yet loaded the definition. Replace it with the real thing now.
  assert(!DD.IsLambda && !MergeDD.IsLambda && "faked up lambda definition?")(static_cast <bool> (!DD.IsLambda && !MergeDD.IsLambda
 && "faked up lambda definition?") ? void (0) : __assert_fail
 ("!DD.IsLambda && !MergeDD.IsLambda && \"faked up lambda definition?\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 1753, __extension__ __PRETTY_FUNCTION__));
  PFDI->second = ASTReader::PendingFakeDefinitionKind::FakeLoaded;

  // Don't change which declaration is the definition; that is required
  // to be invariant once we select it.
  auto *Def = DD.Definition;
  DD = std::move(MergeDD);
  DD.Definition = Def;
  return;
}

// FIXME: Move this out into a .def file?
bool DetectedOdrViolation = false;
1766#define OR_FIELD(Field) DD.Field |= MergeDD.Field;
1767#define MATCH_FIELD(Field) \
  DetectedOdrViolation |= DD.Field != MergeDD.Field; \
  OR_FIELD(Field)
MATCH_FIELD(UserDeclaredConstructor)
MATCH_FIELD(UserDeclaredSpecialMembers)
MATCH_FIELD(Aggregate)
MATCH_FIELD(PlainOldData)
MATCH_FIELD(Empty)
MATCH_FIELD(Polymorphic)
MATCH_FIELD(Abstract)
MATCH_FIELD(IsStandardLayout)
MATCH_FIELD(IsCXX11StandardLayout)
MATCH_FIELD(HasBasesWithFields)
MATCH_FIELD(HasBasesWithNonStaticDataMembers)
MATCH_FIELD(HasPrivateFields)
MATCH_FIELD(HasProtectedFields)
MATCH_FIELD(HasPublicFields)
MATCH_FIELD(HasMutableFields)
MATCH_FIELD(HasVariantMembers)
MATCH_FIELD(HasOnlyCMembers)
MATCH_FIELD(HasInClassInitializer)
MATCH_FIELD(HasUninitializedReferenceMember)
MATCH_FIELD(HasUninitializedFields)
MATCH_FIELD(HasInheritedConstructor)
MATCH_FIELD(HasInheritedAssignment)
MATCH_FIELD(NeedOverloadResolutionForCopyConstructor)
MATCH_FIELD(NeedOverloadResolutionForMoveConstructor)
MATCH_FIELD(NeedOverloadResolutionForMoveAssignment)
MATCH_FIELD(NeedOverloadResolutionForDestructor)
MATCH_FIELD(DefaultedCopyConstructorIsDeleted)
MATCH_FIELD(DefaultedMoveConstructorIsDeleted)
MATCH_FIELD(DefaultedMoveAssignmentIsDeleted)
MATCH_FIELD(DefaultedDestructorIsDeleted)
OR_FIELD(HasTrivialSpecialMembers)
OR_FIELD(HasTrivialSpecialMembersForCall)
OR_FIELD(DeclaredNonTrivialSpecialMembers)
OR_FIELD(DeclaredNonTrivialSpecialMembersForCall)
MATCH_FIELD(HasIrrelevantDestructor)
OR_FIELD(HasConstexprNonCopyMoveConstructor)
OR_FIELD(HasDefaultedDefaultConstructor)
MATCH_FIELD(DefaultedDefaultConstructorIsConstexpr)
OR_FIELD(HasConstexprDefaultConstructor)
MATCH_FIELD(HasNonLiteralTypeFieldsOrBases)
// ComputedVisibleConversions is handled below.
MATCH_FIELD(UserProvidedDefaultConstructor)
OR_FIELD(DeclaredSpecialMembers)
MATCH_FIELD(ImplicitCopyConstructorCanHaveConstParamForVBase)
MATCH_FIELD(ImplicitCopyConstructorCanHaveConstParamForNonVBase)
MATCH_FIELD(ImplicitCopyAssignmentHasConstParam)
OR_FIELD(HasDeclaredCopyConstructorWithConstParam)
OR_FIELD(HasDeclaredCopyAssignmentWithConstParam)
MATCH_FIELD(IsLambda)
1819#undef OR_FIELD
1820#undef MATCH_FIELD

if (DD.NumBases != MergeDD.NumBases || DD.NumVBases != MergeDD.NumVBases)
  DetectedOdrViolation = true;
// FIXME: Issue a diagnostic if the base classes don't match when we come
// to lazily load them.

// FIXME: Issue a diagnostic if the list of conversion functions doesn't
// match when we come to lazily load them.
if (MergeDD.ComputedVisibleConversions && !DD.ComputedVisibleConversions) {
  DD.VisibleConversions = std::move(MergeDD.VisibleConversions);
  DD.ComputedVisibleConversions = true;
}

// FIXME: Issue a diagnostic if FirstFriend doesn't match when we come to
// lazily load it.

if (DD.IsLambda) {
  // FIXME: ODR-checking for merging lambdas (this happens, for instance,
  // when they occur within the body of a function template specialization).
}

if (D->getODRHash() != MergeDD.ODRHash) {
  DetectedOdrViolation = true;
}

if (DetectedOdrViolation)
  Reader.PendingOdrMergeFailures[DD.Definition].push_back(
      {MergeDD.Definition, &MergeDD});
1849}

1851void ASTDeclReader::ReadCXXRecordDefinition(CXXRecordDecl *D, bool Update) {
struct CXXRecordDecl::DefinitionData *DD;
ASTContext &C = Reader.getContext();

// Determine whether this is a lambda closure type, so that we can
// allocate the appropriate DefinitionData structure.
bool IsLambda = Record.readInt();
if (IsLambda)
  DD = new (C) CXXRecordDecl::LambdaDefinitionData(D, nullptr, false, false,
                                                   LCD_None);
else
  DD = new (C) struct CXXRecordDecl::DefinitionData(D);

CXXRecordDecl *Canon = D->getCanonicalDecl();
// Set decl definition data before reading it, so that during deserialization
// when we read CXXRecordDecl, it already has definition data and we don't
// set fake one.
if (!Canon->DefinitionData)
  Canon->DefinitionData = DD;
D->DefinitionData = Canon->DefinitionData;
ReadCXXDefinitionData(*DD, D);

// We might already have a different definition for this record. This can
// happen either because we're reading an update record, or because we've
// already done some merging. Either way, just merge into it.
if (Canon->DefinitionData != DD) {
  MergeDefinitionData(Canon, std::move(*DD));
  return;
}

// Mark this declaration as being a definition.
D->IsCompleteDefinition = true;

// If this is not the first declaration or is an update record, we can have
// other redeclarations already. Make a note that we need to propagate the
// DefinitionData pointer onto them.
if (Update || Canon != D)
  Reader.PendingDefinitions.insert(D);
1889}

1891ASTDeclReader::RedeclarableResult
1892ASTDeclReader::VisitCXXRecordDeclImpl(CXXRecordDecl *D) {
RedeclarableResult Redecl = VisitRecordDeclImpl(D);

ASTContext &C = Reader.getContext();

enum CXXRecKind {
  CXXRecNotTemplate = 0, CXXRecTemplate, CXXRecMemberSpecialization
};
switch ((CXXRecKind)Record.readInt()) {
case CXXRecNotTemplate:
  // Merged when we merge the folding set entry in the primary template.
  if (!isa<ClassTemplateSpecializationDecl>(D))
    mergeRedeclarable(D, Redecl);
  break;
case CXXRecTemplate: {
  // Merged when we merge the template.
  auto *Template = ReadDeclAs<ClassTemplateDecl>();
  D->TemplateOrInstantiation = Template;
  if (!Template->getTemplatedDecl()) {
    // We've not actually loaded the ClassTemplateDecl yet, because we're
    // currently being loaded as its pattern. Rely on it to set up our
    // TypeForDecl (see VisitClassTemplateDecl).
    //
    // Beware: we do not yet know our canonical declaration, and may still
    // get merged once the surrounding class template has got off the ground.
    DeferredTypeID = 0;
  }
  break;
}
case CXXRecMemberSpecialization: {
  auto *RD = ReadDeclAs<CXXRecordDecl>();
  auto TSK = (TemplateSpecializationKind)Record.readInt();
  SourceLocation POI = ReadSourceLocation();
  MemberSpecializationInfo *MSI = new (C) MemberSpecializationInfo(RD, TSK);
  MSI->setPointOfInstantiation(POI);
  D->TemplateOrInstantiation = MSI;
  mergeRedeclarable(D, Redecl);
  break;
}
}

bool WasDefinition = Record.readInt();
if (WasDefinition)
  ReadCXXRecordDefinition(D, /*Update*/false);
else
  // Propagate DefinitionData pointer from the canonical declaration.
  D->DefinitionData = D->getCanonicalDecl()->DefinitionData;

// Lazily load the key function to avoid deserializing every method so we can
// compute it.
if (WasDefinition) {
  DeclID KeyFn = ReadDeclID();
  if (KeyFn && D->IsCompleteDefinition)
    // FIXME: This is wrong for the ARM ABI, where some other module may have
    // made this function no longer be a key function. We need an update
    // record or similar for that case.
    C.KeyFunctions[D] = KeyFn;
}

return Redecl;
1952}

1954void ASTDeclReader::VisitCXXDeductionGuideDecl(CXXDeductionGuideDecl *D) {
VisitFunctionDecl(D);
D->IsCopyDeductionCandidate = Record.readInt();
1957}

1959void ASTDeclReader::VisitCXXMethodDecl(CXXMethodDecl *D) {
VisitFunctionDecl(D);

unsigned NumOverridenMethods = Record.readInt();
if (D->isCanonicalDecl()) {
  while (NumOverridenMethods--) {
    // Avoid invariant checking of CXXMethodDecl::addOverriddenMethod,
    // MD may be initializing.
    if (auto *MD = ReadDeclAs<CXXMethodDecl>())
      Reader.getContext().addOverriddenMethod(D, MD->getCanonicalDecl());
  }
} else {
  // We don't care about which declarations this used to override; we get
  // the relevant information from the canonical declaration.
  Record.skipInts(NumOverridenMethods);
}
1975}

1977void ASTDeclReader::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
// We need the inherited constructor information to merge the declaration,
// so we have to read it before we call VisitCXXMethodDecl.
if (D->isInheritingConstructor()) {
  auto *Shadow = ReadDeclAs<ConstructorUsingShadowDecl>();
  auto *Ctor = ReadDeclAs<CXXConstructorDecl>();
  *D->getTrailingObjects<InheritedConstructor>() =
      InheritedConstructor(Shadow, Ctor);
}

VisitCXXMethodDecl(D);
1988}

1990void ASTDeclReader::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
VisitCXXMethodDecl(D);

if (auto *OperatorDelete = ReadDeclAs<FunctionDecl>()) {
  CXXDestructorDecl *Canon = D->getCanonicalDecl();
  auto *ThisArg = Record.readExpr();
  // FIXME: Check consistency if we have an old and new operator delete.
  if (!Canon->OperatorDelete) {
    Canon->OperatorDelete = OperatorDelete;
    Canon->OperatorDeleteThisArg = ThisArg;
  }
}
2002}

2004void ASTDeclReader::VisitCXXConversionDecl(CXXConversionDecl *D) {
VisitCXXMethodDecl(D);
2006}

2008void ASTDeclReader::VisitImportDecl(ImportDecl *D) {
VisitDecl(D);
D->ImportedAndComplete.setPointer(readModule());
D->ImportedAndComplete.setInt(Record.readInt());
auto *StoredLocs = D->getTrailingObjects<SourceLocation>();
for (unsigned I = 0, N = Record.back(); I != N; ++I)
  StoredLocs[I] = ReadSourceLocation();
Record.skipInts(1); // The number of stored source locations.
2016}

2018void ASTDeclReader::VisitAccessSpecDecl(AccessSpecDecl *D) {
VisitDecl(D);
D->setColonLoc(ReadSourceLocation());
2021}

2023void ASTDeclReader::VisitFriendDecl(FriendDecl *D) {
VisitDecl(D);
if (Record.readInt()) // hasFriendDecl
  D->Friend = ReadDeclAs<NamedDecl>();
else
  D->Friend = GetTypeSourceInfo();
for (unsigned i = 0; i != D->NumTPLists; ++i)
  D->getTrailingObjects<TemplateParameterList *>()[i] =
      Record.readTemplateParameterList();
D->NextFriend = ReadDeclID();
D->UnsupportedFriend = (Record.readInt() != 0);
D->FriendLoc = ReadSourceLocation();
2035}

2037void ASTDeclReader::VisitFriendTemplateDecl(FriendTemplateDecl *D) {
VisitDecl(D);
unsigned NumParams = Record.readInt();
D->NumParams = NumParams;
D->Params = new TemplateParameterList*[NumParams];
for (unsigned i = 0; i != NumParams; ++i)
  D->Params[i] = Record.readTemplateParameterList();
if (Record.readInt()) // HasFriendDecl
  D->Friend = ReadDeclAs<NamedDecl>();
else
  D->Friend = GetTypeSourceInfo();
D->FriendLoc = ReadSourceLocation();
2049}

2051DeclID ASTDeclReader::VisitTemplateDecl(TemplateDecl *D) {
VisitNamedDecl(D);

DeclID PatternID = ReadDeclID();
auto *TemplatedDecl = cast_or_null<NamedDecl>(Reader.GetDecl(PatternID));
TemplateParameterList *TemplateParams = Record.readTemplateParameterList();
// FIXME handle associated constraints
D->init(TemplatedDecl, TemplateParams);

return PatternID;
2061}

2063ASTDeclReader::RedeclarableResult
2064ASTDeclReader::VisitRedeclarableTemplateDecl(RedeclarableTemplateDecl *D) {
RedeclarableResult Redecl = VisitRedeclarable(D);

// Make sure we've allocated the Common pointer first. We do this before
// VisitTemplateDecl so that getCommonPtr() can be used during initialization.
RedeclarableTemplateDecl *CanonD = D->getCanonicalDecl();
if (!CanonD->Common) {
  CanonD->Common = CanonD->newCommon(Reader.getContext());
  Reader.PendingDefinitions.insert(CanonD);
}
D->Common = CanonD->Common;

// If this is the first declaration of the template, fill in the information
// for the 'common' pointer.
if (ThisDeclID == Redecl.getFirstID()) {
  if (auto *RTD = ReadDeclAs<RedeclarableTemplateDecl>()) {
    assert(RTD->getKind() == D->getKind() &&(static_cast <bool> (RTD->getKind() == D->getKind
() && "InstantiatedFromMemberTemplate kind mismatch")
 ? void (0) : __assert_fail ("RTD->getKind() == D->getKind() && \"InstantiatedFromMemberTemplate kind mismatch\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 2081, __extension__ __PRETTY_FUNCTION__))
           "InstantiatedFromMemberTemplate kind mismatch")(static_cast <bool> (RTD->getKind() == D->getKind
() && "InstantiatedFromMemberTemplate kind mismatch")
 ? void (0) : __assert_fail ("RTD->getKind() == D->getKind() && \"InstantiatedFromMemberTemplate kind mismatch\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 2081, __extension__ __PRETTY_FUNCTION__));
    D->setInstantiatedFromMemberTemplate(RTD);
    if (Record.readInt())
      D->setMemberSpecialization();
  }
}

DeclID PatternID = VisitTemplateDecl(D);
D->IdentifierNamespace = Record.readInt();

mergeRedeclarable(D, Redecl, PatternID);

// If we merged the template with a prior declaration chain, merge the common
// pointer.
// FIXME: Actually merge here, don't just overwrite.
D->Common = D->getCanonicalDecl()->Common;

return Redecl;
2099}

2101void ASTDeclReader::VisitClassTemplateDecl(ClassTemplateDecl *D) {
RedeclarableResult Redecl = VisitRedeclarableTemplateDecl(D);

if (ThisDeclID == Redecl.getFirstID()) {
  // This ClassTemplateDecl owns a CommonPtr; read it to keep track of all of
  // the specializations.
  SmallVector<serialization::DeclID, 32> SpecIDs;
  ReadDeclIDList(SpecIDs);
  ASTDeclReader::AddLazySpecializations(D, SpecIDs);
}

if (D->getTemplatedDecl()->TemplateOrInstantiation) {
  // We were loaded before our templated declaration was. We've not set up
  // its corresponding type yet (see VisitCXXRecordDeclImpl), so reconstruct
  // it now.
  Reader.getContext().getInjectedClassNameType(
      D->getTemplatedDecl(), D->getInjectedClassNameSpecialization());
}
2119}

2121void ASTDeclReader::VisitBuiltinTemplateDecl(BuiltinTemplateDecl *D) {
llvm_unreachable("BuiltinTemplates are not serialized")::llvm::llvm_unreachable_internal("BuiltinTemplates are not serialized"
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 2122);
2123}

2125/// TODO: Unify with ClassTemplateDecl version?
2126///       May require unifying ClassTemplateDecl and
2127///        VarTemplateDecl beyond TemplateDecl...
2128void ASTDeclReader::VisitVarTemplateDecl(VarTemplateDecl *D) {
RedeclarableResult Redecl = VisitRedeclarableTemplateDecl(D);

if (ThisDeclID == Redecl.getFirstID()) {
  // This VarTemplateDecl owns a CommonPtr; read it to keep track of all of
  // the specializations.
  SmallVector<serialization::DeclID, 32> SpecIDs;
  ReadDeclIDList(SpecIDs);
  ASTDeclReader::AddLazySpecializations(D, SpecIDs);
}
2138}

2140ASTDeclReader::RedeclarableResult
2141ASTDeclReader::VisitClassTemplateSpecializationDeclImpl(
  ClassTemplateSpecializationDecl *D) {
RedeclarableResult Redecl = VisitCXXRecordDeclImpl(D);

ASTContext &C = Reader.getContext();
if (Decl *InstD = ReadDecl()) {
  if (auto *CTD = dyn_cast<ClassTemplateDecl>(InstD)) {
    D->SpecializedTemplate = CTD;
  } else {
    SmallVector<TemplateArgument, 8> TemplArgs;
    Record.readTemplateArgumentList(TemplArgs);
    TemplateArgumentList *ArgList
      = TemplateArgumentList::CreateCopy(C, TemplArgs);
    auto *PS =
        new (C) ClassTemplateSpecializationDecl::
                                           SpecializedPartialSpecialization();
    PS->PartialSpecialization
        = cast<ClassTemplatePartialSpecializationDecl>(InstD);
    PS->TemplateArgs = ArgList;
    D->SpecializedTemplate = PS;
  }
}

SmallVector<TemplateArgument, 8> TemplArgs;
Record.readTemplateArgumentList(TemplArgs, /*Canonicalize*/ true);
D->TemplateArgs = TemplateArgumentList::CreateCopy(C, TemplArgs);
D->PointOfInstantiation = ReadSourceLocation();
D->SpecializationKind = (TemplateSpecializationKind)Record.readInt();

bool writtenAsCanonicalDecl = Record.readInt();
if (writtenAsCanonicalDecl) {
  auto *CanonPattern = ReadDeclAs<ClassTemplateDecl>();
  if (D->isCanonicalDecl()) { // It's kept in the folding set.
    // Set this as, or find, the canonical declaration for this specialization
    ClassTemplateSpecializationDecl *CanonSpec;
    if (auto *Partial = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) {
      CanonSpec = CanonPattern->getCommonPtr()->PartialSpecializations
          .GetOrInsertNode(Partial);
    } else {
      CanonSpec =
          CanonPattern->getCommonPtr()->Specializations.GetOrInsertNode(D);
    }
    // If there was already a canonical specialization, merge into it.
    if (CanonSpec != D) {
      mergeRedeclarable<TagDecl>(D, CanonSpec, Redecl);

      // This declaration might be a definition. Merge with any existing
      // definition.
      if (auto *DDD = D->DefinitionData) {
        if (CanonSpec->DefinitionData)
          MergeDefinitionData(CanonSpec, std::move(*DDD));
        else
          CanonSpec->DefinitionData = D->DefinitionData;
      }
      D->DefinitionData = CanonSpec->DefinitionData;
    }
  }
}

// Explicit info.
if (TypeSourceInfo *TyInfo = GetTypeSourceInfo()) {
  auto *ExplicitInfo =
      new (C) ClassTemplateSpecializationDecl::ExplicitSpecializationInfo;
  ExplicitInfo->TypeAsWritten = TyInfo;
  ExplicitInfo->ExternLoc = ReadSourceLocation();
  ExplicitInfo->TemplateKeywordLoc = ReadSourceLocation();
  D->ExplicitInfo = ExplicitInfo;
}

return Redecl;
2211}

2213void ASTDeclReader::VisitClassTemplatePartialSpecializationDecl(
                                  ClassTemplatePartialSpecializationDecl *D) {
RedeclarableResult Redecl = VisitClassTemplateSpecializationDeclImpl(D);

D->TemplateParams = Record.readTemplateParameterList();
D->ArgsAsWritten = Record.readASTTemplateArgumentListInfo();

// These are read/set from/to the first declaration.
if (ThisDeclID == Redecl.getFirstID()) {
  D->InstantiatedFromMember.setPointer(
    ReadDeclAs<ClassTemplatePartialSpecializationDecl>());
  D->InstantiatedFromMember.setInt(Record.readInt());
}
2226}

2228void ASTDeclReader::VisitClassScopeFunctionSpecializationDecl(
                                  ClassScopeFunctionSpecializationDecl *D) {
VisitDecl(D);
D->Specialization = ReadDeclAs<CXXMethodDecl>();
2232}

2234void ASTDeclReader::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
RedeclarableResult Redecl = VisitRedeclarableTemplateDecl(D);

if (ThisDeclID == Redecl.getFirstID()) {
  // This FunctionTemplateDecl owns a CommonPtr; read it.
  SmallVector<serialization::DeclID, 32> SpecIDs;
  ReadDeclIDList(SpecIDs);
  ASTDeclReader::AddLazySpecializations(D, SpecIDs);
}
2243}

2245/// TODO: Unify with ClassTemplateSpecializationDecl version?
2246///       May require unifying ClassTemplate(Partial)SpecializationDecl and
2247///        VarTemplate(Partial)SpecializationDecl with a new data
2248///        structure Template(Partial)SpecializationDecl, and
2249///        using Template(Partial)SpecializationDecl as input type.
2250ASTDeclReader::RedeclarableResult
2251ASTDeclReader::VisitVarTemplateSpecializationDeclImpl(
  VarTemplateSpecializationDecl *D) {
RedeclarableResult Redecl = VisitVarDeclImpl(D);

ASTContext &C = Reader.getContext();
if (Decl *InstD = ReadDecl()) {
  if (auto *VTD = dyn_cast<VarTemplateDecl>(InstD)) {
    D->SpecializedTemplate = VTD;
  } else {
    SmallVector<TemplateArgument, 8> TemplArgs;
    Record.readTemplateArgumentList(TemplArgs);
    TemplateArgumentList *ArgList = TemplateArgumentList::CreateCopy(
        C, TemplArgs);
    auto *PS =
        new (C)
        VarTemplateSpecializationDecl::SpecializedPartialSpecialization();
    PS->PartialSpecialization =
        cast<VarTemplatePartialSpecializationDecl>(InstD);
    PS->TemplateArgs = ArgList;
    D->SpecializedTemplate = PS;
  }
}

// Explicit info.
if (TypeSourceInfo *TyInfo = GetTypeSourceInfo()) {
  auto *ExplicitInfo =
      new (C) VarTemplateSpecializationDecl::ExplicitSpecializationInfo;
  ExplicitInfo->TypeAsWritten = TyInfo;
  ExplicitInfo->ExternLoc = ReadSourceLocation();
  ExplicitInfo->TemplateKeywordLoc = ReadSourceLocation();
  D->ExplicitInfo = ExplicitInfo;
}

SmallVector<TemplateArgument, 8> TemplArgs;
Record.readTemplateArgumentList(TemplArgs, /*Canonicalize*/ true);
D->TemplateArgs = TemplateArgumentList::CreateCopy(C, TemplArgs);
D->PointOfInstantiation = ReadSourceLocation();
D->SpecializationKind = (TemplateSpecializationKind)Record.readInt();
D->IsCompleteDefinition = Record.readInt();

bool writtenAsCanonicalDecl = Record.readInt();
if (writtenAsCanonicalDecl) {
  auto *CanonPattern = ReadDeclAs<VarTemplateDecl>();
  if (D->isCanonicalDecl()) { // It's kept in the folding set.
    // FIXME: If it's already present, merge it.
    if (auto *Partial = dyn_cast<VarTemplatePartialSpecializationDecl>(D)) {
      CanonPattern->getCommonPtr()->PartialSpecializations
          .GetOrInsertNode(Partial);
    } else {
      CanonPattern->getCommonPtr()->Specializations.GetOrInsertNode(D);
    }
  }
}

return Redecl;
2306}

2308/// TODO: Unify with ClassTemplatePartialSpecializationDecl version?
2309///       May require unifying ClassTemplate(Partial)SpecializationDecl and
2310///        VarTemplate(Partial)SpecializationDecl with a new data
2311///        structure Template(Partial)SpecializationDecl, and
2312///        using Template(Partial)SpecializationDecl as input type.
2313void ASTDeclReader::VisitVarTemplatePartialSpecializationDecl(
  VarTemplatePartialSpecializationDecl *D) {
RedeclarableResult Redecl = VisitVarTemplateSpecializationDeclImpl(D);

D->TemplateParams = Record.readTemplateParameterList();
D->ArgsAsWritten = Record.readASTTemplateArgumentListInfo();

// These are read/set from/to the first declaration.
if (ThisDeclID == Redecl.getFirstID()) {
  D->InstantiatedFromMember.setPointer(
      ReadDeclAs<VarTemplatePartialSpecializationDecl>());
  D->InstantiatedFromMember.setInt(Record.readInt());
}
2326}

2328void ASTDeclReader::VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D) {
VisitTypeDecl(D);

D->setDeclaredWithTypename(Record.readInt());

if (Record.readInt())
  D->setDefaultArgument(GetTypeSourceInfo());
2335}

2337void ASTDeclReader::VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {
VisitDeclaratorDecl(D);
// TemplateParmPosition.
D->setDepth(Record.readInt());
D->setPosition(Record.readInt());
if (D->isExpandedParameterPack()) {
  auto TypesAndInfos =
      D->getTrailingObjects<std::pair<QualType, TypeSourceInfo *>>();
  for (unsigned I = 0, N = D->getNumExpansionTypes(); I != N; ++I) {
    new (&TypesAndInfos[I].first) QualType(Record.readType());
    TypesAndInfos[I].second = GetTypeSourceInfo();
  }
} else {
  // Rest of NonTypeTemplateParmDecl.
  D->ParameterPack = Record.readInt();
  if (Record.readInt())
    D->setDefaultArgument(Record.readExpr());
}
2355}

2357void ASTDeclReader::VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D) {
VisitTemplateDecl(D);
// TemplateParmPosition.
D->setDepth(Record.readInt());
D->setPosition(Record.readInt());
if (D->isExpandedParameterPack()) {
  auto **Data = D->getTrailingObjects<TemplateParameterList *>();
  for (unsigned I = 0, N = D->getNumExpansionTemplateParameters();
       I != N; ++I)
    Data[I] = Record.readTemplateParameterList();
} else {
  // Rest of TemplateTemplateParmDecl.
  D->ParameterPack = Record.readInt();
  if (Record.readInt())
    D->setDefaultArgument(Reader.getContext(),
                          Record.readTemplateArgumentLoc());
}
2374}

2376void ASTDeclReader::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) {
VisitRedeclarableTemplateDecl(D);
2378}

2380void ASTDeclReader::VisitStaticAssertDecl(StaticAssertDecl *D) {
VisitDecl(D);
D->AssertExprAndFailed.setPointer(Record.readExpr());
D->AssertExprAndFailed.setInt(Record.readInt());
D->Message = cast_or_null<StringLiteral>(Record.readExpr());
D->RParenLoc = ReadSourceLocation();
2386}

2388void ASTDeclReader::VisitEmptyDecl(EmptyDecl *D) {
VisitDecl(D);
2390}

2392std::pair<uint64_t, uint64_t>
2393ASTDeclReader::VisitDeclContext(DeclContext *DC) {
uint64_t LexicalOffset = ReadLocalOffset();
uint64_t VisibleOffset = ReadLocalOffset();
return std::make_pair(LexicalOffset, VisibleOffset);
2397}

2399template <typename T>
2400ASTDeclReader::RedeclarableResult
2401ASTDeclReader::VisitRedeclarable(Redeclarable<T> *D) {
DeclID FirstDeclID = ReadDeclID();
Decl *MergeWith = nullptr;

bool IsKeyDecl = ThisDeclID == FirstDeclID;
bool IsFirstLocalDecl = false;

uint64_t RedeclOffset = 0;

// 0 indicates that this declaration was the only declaration of its entity,
// and is used for space optimization.
if (FirstDeclID == 0) {
  FirstDeclID = ThisDeclID;
  IsKeyDecl = true;
  IsFirstLocalDecl = true;
} else if (unsigned N = Record.readInt()) {
  // This declaration was the first local declaration, but may have imported
  // other declarations.
  IsKeyDecl = N == 1;
  IsFirstLocalDecl = true;

  // We have some declarations that must be before us in our redeclaration
  // chain. Read them now, and remember that we ought to merge with one of
  // them.
  // FIXME: Provide a known merge target to the second and subsequent such
  // declaration.
  for (unsigned I = 0; I != N - 1; ++I)
    MergeWith = ReadDecl();

  RedeclOffset = ReadLocalOffset();
} else {
  // This declaration was not the first local declaration. Read the first
  // local declaration now, to trigger the import of other redeclarations.
  (void)ReadDecl();
}

auto *FirstDecl = cast_or_null<T>(Reader.GetDecl(FirstDeclID));
if (FirstDecl != D) {
  // We delay loading of the redeclaration chain to avoid deeply nested calls.
  // We temporarily set the first (canonical) declaration as the previous one
  // which is the one that matters and mark the real previous DeclID to be
  // loaded & attached later on.
  D->RedeclLink = Redeclarable<T>::PreviousDeclLink(FirstDecl);
  D->First = FirstDecl->getCanonicalDecl();
}

auto *DAsT = static_cast<T *>(D);

// Note that we need to load local redeclarations of this decl and build a
// decl chain for them. This must happen *after* we perform the preloading
// above; this ensures that the redeclaration chain is built in the correct
// order.
if (IsFirstLocalDecl)
  Reader.PendingDeclChains.push_back(std::make_pair(DAsT, RedeclOffset));

return RedeclarableResult(MergeWith, FirstDeclID, IsKeyDecl);
2457}

2459/// Attempts to merge the given declaration (D) with another declaration
2460/// of the same entity.
2461template<typename T>
2462void ASTDeclReader::mergeRedeclarable(Redeclarable<T> *DBase,
                                    RedeclarableResult &Redecl,
                                    DeclID TemplatePatternID) {
// If modules are not available, there is no reason to perform this merge.
if (!Reader.getContext().getLangOpts().Modules)
  return;

// If we're not the canonical declaration, we don't need to merge.
if (!DBase->isFirstDecl())
  return;

auto *D = static_cast<T *>(DBase);

if (auto *Existing = Redecl.getKnownMergeTarget())
  // We already know of an existing declaration we should merge with.
  mergeRedeclarable(D, cast<T>(Existing), Redecl, TemplatePatternID);
else if (FindExistingResult ExistingRes = findExisting(D))
  if (T *Existing = ExistingRes)
    mergeRedeclarable(D, Existing, Redecl, TemplatePatternID);
2481}

2483/// "Cast" to type T, asserting if we don't have an implicit conversion.
2484/// We use this to put code in a template that will only be valid for certain
2485/// instantiations.
2486template<typename T> static T assert_cast(T t) { return t; }
2487template<typename T> static T assert_cast(...) {
llvm_unreachable("bad assert_cast")::llvm::llvm_unreachable_internal("bad assert_cast", "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 2488);
2489}

2491/// Merge together the pattern declarations from two template
2492/// declarations.
2493void ASTDeclReader::mergeTemplatePattern(RedeclarableTemplateDecl *D,
                                       RedeclarableTemplateDecl *Existing,
                                       DeclID DsID, bool IsKeyDecl) {
auto *DPattern = D->getTemplatedDecl();
auto *ExistingPattern = Existing->getTemplatedDecl();
RedeclarableResult Result(/*MergeWith*/ ExistingPattern,
                          DPattern->getCanonicalDecl()->getGlobalID(),
                          IsKeyDecl);

if (auto *DClass = dyn_cast<CXXRecordDecl>(DPattern)) {
  // Merge with any existing definition.
  // FIXME: This is duplicated in several places. Refactor.
  auto *ExistingClass =
      cast<CXXRecordDecl>(ExistingPattern)->getCanonicalDecl();
  if (auto *DDD = DClass->DefinitionData) {
    if (ExistingClass->DefinitionData) {
      MergeDefinitionData(ExistingClass, std::move(*DDD));
    } else {
      ExistingClass->DefinitionData = DClass->DefinitionData;
      // We may have skipped this before because we thought that DClass
      // was the canonical declaration.
      Reader.PendingDefinitions.insert(DClass);
    }
  }
  DClass->DefinitionData = ExistingClass->DefinitionData;

  return mergeRedeclarable(DClass, cast<TagDecl>(ExistingPattern),
                           Result);
}
if (auto *DFunction = dyn_cast<FunctionDecl>(DPattern))
  return mergeRedeclarable(DFunction, cast<FunctionDecl>(ExistingPattern),
                           Result);
if (auto *DVar = dyn_cast<VarDecl>(DPattern))
  return mergeRedeclarable(DVar, cast<VarDecl>(ExistingPattern), Result);
if (auto *DAlias = dyn_cast<TypeAliasDecl>(DPattern))
  return mergeRedeclarable(DAlias, cast<TypedefNameDecl>(ExistingPattern),
                           Result);
llvm_unreachable("merged an unknown kind of redeclarable template")::llvm::llvm_unreachable_internal("merged an unknown kind of redeclarable template"
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 2530);
2531}

2533/// Attempts to merge the given declaration (D) with another declaration
2534/// of the same entity.
2535template<typename T>
2536void ASTDeclReader::mergeRedeclarable(Redeclarable<T> *DBase, T *Existing,
                                    RedeclarableResult &Redecl,
                                    DeclID TemplatePatternID) {
auto *D = static_cast<T *>(DBase);
T *ExistingCanon = Existing->getCanonicalDecl();
T *DCanon = D->getCanonicalDecl();
if (ExistingCanon != DCanon) {
  assert(DCanon->getGlobalID() == Redecl.getFirstID() &&(static_cast <bool> (DCanon->getGlobalID() == Redecl
.getFirstID() && "already merged this declaration") ?
 void (0) : __assert_fail ("DCanon->getGlobalID() == Redecl.getFirstID() && \"already merged this declaration\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 2544, __extension__ __PRETTY_FUNCTION__))
         "already merged this declaration")(static_cast <bool> (DCanon->getGlobalID() == Redecl
.getFirstID() && "already merged this declaration") ?
 void (0) : __assert_fail ("DCanon->getGlobalID() == Redecl.getFirstID() && \"already merged this declaration\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 2544, __extension__ __PRETTY_FUNCTION__));

  // Have our redeclaration link point back at the canonical declaration
  // of the existing declaration, so that this declaration has the
  // appropriate canonical declaration.
  D->RedeclLink = Redeclarable<T>::PreviousDeclLink(ExistingCanon);
  D->First = ExistingCanon;
  ExistingCanon->Used |= D->Used;
  D->Used = false;

  // When we merge a namespace, update its pointer to the first namespace.
  // We cannot have loaded any redeclarations of this declaration yet, so
  // there's nothing else that needs to be updated.
  if (auto *Namespace = dyn_cast<NamespaceDecl>(D))
    Namespace->AnonOrFirstNamespaceAndInline.setPointer(
        assert_cast<NamespaceDecl*>(ExistingCanon));

  // When we merge a template, merge its pattern.
  if (auto *DTemplate = dyn_cast<RedeclarableTemplateDecl>(D))
    mergeTemplatePattern(
        DTemplate, assert_cast<RedeclarableTemplateDecl*>(ExistingCanon),
        TemplatePatternID, Redecl.isKeyDecl());

  // If this declaration is a key declaration, make a note of that.
  if (Redecl.isKeyDecl())
    Reader.KeyDecls[ExistingCanon].push_back(Redecl.getFirstID());
}
2571}

2573/// ODR-like semantics for C/ObjC allow us to merge tag types and a structural
2574/// check in Sema guarantees the types can be merged (see C11 6.2.7/1 or C89
2575/// 6.1.2.6/1). Although most merging is done in Sema, we need to guarantee
2576/// that some types are mergeable during deserialization, otherwise name
2577/// lookup fails. This is the case for EnumConstantDecl.
2578static bool allowODRLikeMergeInC(NamedDecl *ND) {
if (!ND)
  return false;
// TODO: implement merge for other necessary decls.
if (isa<EnumConstantDecl>(ND))
  return true;
return false;
2585}

2587/// Attempts to merge the given declaration (D) with another declaration
2588/// of the same entity, for the case where the entity is not actually
2589/// redeclarable. This happens, for instance, when merging the fields of
2590/// identical class definitions from two different modules.
2591template<typename T>
2592void ASTDeclReader::mergeMergeable(Mergeable<T> *D) {
// If modules are not available, there is no reason to perform this merge.
if (!Reader.getContext().getLangOpts().Modules)
  return;

// ODR-based merging is performed in C++ and in some cases (tag types) in C.
// Note that C identically-named things in different translation units are
// not redeclarations, but may still have compatible types, where ODR-like
// semantics may apply.
if (!Reader.getContext().getLangOpts().CPlusPlus &&
    !allowODRLikeMergeInC(dyn_cast<NamedDecl>(static_cast<T*>(D))))
  return;

if (FindExistingResult ExistingRes = findExisting(static_cast<T*>(D)))
  if (T *Existing = ExistingRes)
    Reader.getContext().setPrimaryMergedDecl(static_cast<T *>(D),
                                             Existing->getCanonicalDecl());
2609}

2611void ASTDeclReader::VisitOMPThreadPrivateDecl(OMPThreadPrivateDecl *D) {
VisitDecl(D);
unsigned NumVars = D->varlist_size();
SmallVector<Expr *, 16> Vars;
Vars.reserve(NumVars);
for (unsigned i = 0; i != NumVars; ++i) {
  Vars.push_back(Record.readExpr());
}
D->setVars(Vars);
2620}

2622void ASTDeclReader::VisitOMPDeclareReductionDecl(OMPDeclareReductionDecl *D) {
VisitValueDecl(D);
D->setLocation(ReadSourceLocation());
D->setCombiner(Record.readExpr());
D->setInitializer(
    Record.readExpr(),
    static_cast<OMPDeclareReductionDecl::InitKind>(Record.readInt()));
D->PrevDeclInScope = ReadDeclID();
2630}

2632void ASTDeclReader::VisitOMPCapturedExprDecl(OMPCapturedExprDecl *D) {
VisitVarDecl(D);
2634}

2636//===----------------------------------------------------------------------===//
2637// Attribute Reading
2638//===----------------------------------------------------------------------===//

2640/// Reads attributes from the current stream position.
2641void ASTReader::ReadAttributes(ASTRecordReader &Record, AttrVec &Attrs) {
for (unsigned i = 0, e = Record.readInt(); i != e; ++i) {
  Attr *New = nullptr;
  auto Kind = (attr::Kind)Record.readInt();
  SourceRange Range = Record.readSourceRange();
  ASTContext &Context = getContext();

2648#include "clang/Serialization/AttrPCHRead.inc"

  assert(New && "Unable to decode attribute?")(static_cast <bool> (New && "Unable to decode attribute?"
) ? void (0) : __assert_fail ("New && \"Unable to decode attribute?\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 2650, __extension__ __PRETTY_FUNCTION__));
  Attrs.push_back(New);
}
2653}

2655//===----------------------------------------------------------------------===//
2656// ASTReader Implementation
2657//===----------------------------------------------------------------------===//

2659/// Note that we have loaded the declaration with the given
2660/// Index.
2661///
2662/// This routine notes that this declaration has already been loaded,
2663/// so that future GetDecl calls will return this declaration rather
2664/// than trying to load a new declaration.
2665inline void ASTReader::LoadedDecl(unsigned Index, Decl *D) {
assert(!DeclsLoaded[Index] && "Decl loaded twice?")(static_cast <bool> (!DeclsLoaded[Index] && "Decl loaded twice?"
) ? void (0) : __assert_fail ("!DeclsLoaded[Index] && \"Decl loaded twice?\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 2666, __extension__ __PRETTY_FUNCTION__));
DeclsLoaded[Index] = D;
2668}

2670/// Determine whether the consumer will be interested in seeing
2671/// this declaration (via HandleTopLevelDecl).
2672///
2673/// This routine should return true for anything that might affect
2674/// code generation, e.g., inline function definitions, Objective-C
2675/// declarations with metadata, etc.
2676static bool isConsumerInterestedIn(ASTContext &Ctx, Decl *D, bool HasBody) {
// An ObjCMethodDecl is never considered as "interesting" because its
// implementation container always is.

// An ImportDecl or VarDecl imported from a module map module will get
// emitted when we import the relevant module.
if (isa<ImportDecl>(D) || isa<VarDecl>(D)) {
  auto *M = D->getImportedOwningModule();
  if (M && M->Kind == Module::ModuleMapModule &&
      Ctx.DeclMustBeEmitted(D))
    return false;
}

if (isa<FileScopeAsmDecl>(D) || 
    isa<ObjCProtocolDecl>(D) || 
    isa<ObjCImplDecl>(D) ||
    isa<ImportDecl>(D) ||
    isa<PragmaCommentDecl>(D) ||
    isa<PragmaDetectMismatchDecl>(D))
  return true;
if (isa<OMPThreadPrivateDecl>(D) || isa<OMPDeclareReductionDecl>(D))
  return !D->getDeclContext()->isFunctionOrMethod();
if (const auto *Var = dyn_cast<VarDecl>(D))
  return Var->isFileVarDecl() &&
         Var->isThisDeclarationADefinition() == VarDecl::Definition;
if (const auto *Func = dyn_cast<FunctionDecl>(D))
  return Func->doesThisDeclarationHaveABody() || HasBody;

if (auto *ES = D->getASTContext().getExternalSource())
  if (ES->hasExternalDefinitions(D) == ExternalASTSource::EK_Never)
    return true;

return false;
2709}

2711/// Get the correct cursor and offset for loading a declaration.
2712ASTReader::RecordLocation
2713ASTReader::DeclCursorForID(DeclID ID, SourceLocation &Loc) {
GlobalDeclMapType::iterator I = GlobalDeclMap.find(ID);
assert(I != GlobalDeclMap.end() && "Corrupted global declaration map")(static_cast <bool> (I != GlobalDeclMap.end() &&
 "Corrupted global declaration map") ? void (0) : __assert_fail
 ("I != GlobalDeclMap.end() && \"Corrupted global declaration map\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 2715, __extension__ __PRETTY_FUNCTION__));
ModuleFile *M = I->second;
const DeclOffset &DOffs =
    M->DeclOffsets[ID - M->BaseDeclID - NUM_PREDEF_DECL_IDS];
Loc = TranslateSourceLocation(*M, DOffs.getLocation());
return RecordLocation(M, DOffs.BitOffset);
2721}

2723ASTReader::RecordLocation ASTReader::getLocalBitOffset(uint64_t GlobalOffset) {
auto I = GlobalBitOffsetsMap.find(GlobalOffset);

assert(I != GlobalBitOffsetsMap.end() && "Corrupted global bit offsets map")(static_cast <bool> (I != GlobalBitOffsetsMap.end() &&
 "Corrupted global bit offsets map") ? void (0) : __assert_fail
 ("I != GlobalBitOffsetsMap.end() && \"Corrupted global bit offsets map\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 2726, __extension__ __PRETTY_FUNCTION__));
return RecordLocation(I->second, GlobalOffset - I->second->GlobalBitOffset);
2728}

2730uint64_t ASTReader::getGlobalBitOffset(ModuleFile &M, uint32_t LocalOffset) {
return LocalOffset + M.GlobalBitOffset;
2732}

2734static bool isSameTemplateParameterList(const TemplateParameterList *X,
                                      const TemplateParameterList *Y);

2737/// Determine whether two template parameters are similar enough
2738/// that they may be used in declarations of the same template.
2739static bool isSameTemplateParameter(const NamedDecl *X,
                                  const NamedDecl *Y) {
if (X->getKind() != Y->getKind())
  return false;

if (const auto *TX = dyn_cast<TemplateTypeParmDecl>(X)) {
  const auto *TY = cast<TemplateTypeParmDecl>(Y);
  return TX->isParameterPack() == TY->isParameterPack();
}

if (const auto *TX = dyn_cast<NonTypeTemplateParmDecl>(X)) {
  const auto *TY = cast<NonTypeTemplateParmDecl>(Y);
  return TX->isParameterPack() == TY->isParameterPack() &&
         TX->getASTContext().hasSameType(TX->getType(), TY->getType());
}

const auto *TX = cast<TemplateTemplateParmDecl>(X);
const auto *TY = cast<TemplateTemplateParmDecl>(Y);
return TX->isParameterPack() == TY->isParameterPack() &&
       isSameTemplateParameterList(TX->getTemplateParameters(),
                                   TY->getTemplateParameters());
2760}

2762static NamespaceDecl *getNamespace(const NestedNameSpecifier *X) {
if (auto *NS = X->getAsNamespace())
  return NS;
if (auto *NAS = X->getAsNamespaceAlias())
  return NAS->getNamespace();
return nullptr;
2768}

2770static bool isSameQualifier(const NestedNameSpecifier *X,
                          const NestedNameSpecifier *Y) {
if (auto *NSX = getNamespace(X)) {
  auto *NSY = getNamespace(Y);
  if (!NSY || NSX->getCanonicalDecl() != NSY->getCanonicalDecl())
    return false;
} else if (X->getKind() != Y->getKind())
  return false;

// FIXME: For namespaces and types, we're permitted to check that the entity
// is named via the same tokens. We should probably do so.
switch (X->getKind()) {
case NestedNameSpecifier::Identifier:
  if (X->getAsIdentifier() != Y->getAsIdentifier())
    return false;
  break;
case NestedNameSpecifier::Namespace:
case NestedNameSpecifier::NamespaceAlias:
  // We've already checked that we named the same namespace.
  break;
case NestedNameSpecifier::TypeSpec:
case NestedNameSpecifier::TypeSpecWithTemplate:
  if (X->getAsType()->getCanonicalTypeInternal() !=
      Y->getAsType()->getCanonicalTypeInternal())
    return false;
  break;
case NestedNameSpecifier::Global:
case NestedNameSpecifier::Super:
  return true;
}

// Recurse into earlier portion of NNS, if any.
auto *PX = X->getPrefix();
auto *PY = Y->getPrefix();
if (PX && PY)
  return isSameQualifier(PX, PY);
return !PX && !PY;
2807}

2809/// Determine whether two template parameter lists are similar enough
2810/// that they may be used in declarations of the same template.
2811static bool isSameTemplateParameterList(const TemplateParameterList *X,
                                      const TemplateParameterList *Y) {
if (X->size() != Y->size())
  return false;

for (unsigned I = 0, N = X->size(); I != N; ++I)
  if (!isSameTemplateParameter(X->getParam(I), Y->getParam(I)))
    return false;

return true;
2821}

2823/// Determine whether the attributes we can overload on are identical for A and
2824/// B. Will ignore any overloadable attrs represented in the type of A and B.
2825static bool hasSameOverloadableAttrs(const FunctionDecl *A,
                                   const FunctionDecl *B) {
// Note that pass_object_size attributes are represented in the function's
// ExtParameterInfo, so we don't need to check them here.

SmallVector<const EnableIfAttr *, 4> AEnableIfs;
// Since this is an equality check, we can ignore that enable_if attrs show up
// in reverse order.
for (const auto *EIA : A->specific_attrs<EnableIfAttr>())
  AEnableIfs.push_back(EIA);

SmallVector<const EnableIfAttr *, 4> BEnableIfs;
for (const auto *EIA : B->specific_attrs<EnableIfAttr>())
  BEnableIfs.push_back(EIA);

// Two very common cases: either we have 0 enable_if attrs, or we have an
// unequal number of enable_if attrs.
if (AEnableIfs.empty() && BEnableIfs.empty())
  return true;

if (AEnableIfs.size() != BEnableIfs.size())
  return false;

llvm::FoldingSetNodeID Cand1ID, Cand2ID;
for (unsigned I = 0, E = AEnableIfs.size(); I != E; ++I) {
  Cand1ID.clear();
  Cand2ID.clear();

  AEnableIfs[I]->getCond()->Profile(Cand1ID, A->getASTContext(), true);
  BEnableIfs[I]->getCond()->Profile(Cand2ID, B->getASTContext(), true);
  if (Cand1ID != Cand2ID)
    return false;
}

return true;
2860}

2862/// Determine whether the two declarations refer to the same entity.
2863static bool isSameEntity(NamedDecl *X, NamedDecl *Y) {
assert(X->getDeclName() == Y->getDeclName() && "Declaration name mismatch!")(static_cast <bool> (X->getDeclName() == Y->getDeclName
() && "Declaration name mismatch!") ? void (0) : __assert_fail
 ("X->getDeclName() == Y->getDeclName() && \"Declaration name mismatch!\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 2864, __extension__ __PRETTY_FUNCTION__));

if (X == Y)
  return true;

// Must be in the same context.
//
// Note that we can't use DeclContext::Equals here, because the DeclContexts
// could be two different declarations of the same function. (We will fix the
// semantic DC to refer to the primary definition after merging.)
if (!declaresSameEntity(cast<Decl>(X->getDeclContext()->getRedeclContext()),
                        cast<Decl>(Y->getDeclContext()->getRedeclContext())))
  return false;

// Two typedefs refer to the same entity if they have the same underlying
// type.
if (const auto *TypedefX = dyn_cast<TypedefNameDecl>(X))
  if (const auto *TypedefY = dyn_cast<TypedefNameDecl>(Y))
    return X->getASTContext().hasSameType(TypedefX->getUnderlyingType(),
                                          TypedefY->getUnderlyingType());

// Must have the same kind.
if (X->getKind() != Y->getKind())
  return false;

// Objective-C classes and protocols with the same name always match.
if (isa<ObjCInterfaceDecl>(X) || isa<ObjCProtocolDecl>(X))
  return true;

if (isa<ClassTemplateSpecializationDecl>(X)) {
  // No need to handle these here: we merge them when adding them to the
  // template.
  return false;
}

// Compatible tags match.
if (const auto *TagX = dyn_cast<TagDecl>(X)) {
  const auto *TagY = cast<TagDecl>(Y);
  return (TagX->getTagKind() == TagY->getTagKind()) ||
    ((TagX->getTagKind() == TTK_Struct || TagX->getTagKind() == TTK_Class ||
      TagX->getTagKind() == TTK_Interface) &&
     (TagY->getTagKind() == TTK_Struct || TagY->getTagKind() == TTK_Class ||
      TagY->getTagKind() == TTK_Interface));
}

// Functions with the same type and linkage match.
// FIXME: This needs to cope with merging of prototyped/non-prototyped
// functions, etc.
if (const auto *FuncX = dyn_cast<FunctionDecl>(X)) {
  const auto *FuncY = cast<FunctionDecl>(Y);
  if (const auto *CtorX = dyn_cast<CXXConstructorDecl>(X)) {
    const auto *CtorY = cast<CXXConstructorDecl>(Y);
    if (CtorX->getInheritedConstructor() &&
        !isSameEntity(CtorX->getInheritedConstructor().getConstructor(),
                      CtorY->getInheritedConstructor().getConstructor()))
      return false;
  }

  if (FuncX->isMultiVersion() != FuncY->isMultiVersion())
    return false;

  // Multiversioned functions with different feature strings are represented
  // as separate declarations.
  if (FuncX->isMultiVersion()) {
    const auto *TAX = FuncX->getAttr<TargetAttr>();
    const auto *TAY = FuncY->getAttr<TargetAttr>();
    assert(TAX && TAY && "Multiversion Function without target attribute")(static_cast <bool> (TAX && TAY && "Multiversion Function without target attribute"
) ? void (0) : __assert_fail ("TAX && TAY && \"Multiversion Function without target attribute\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 2930, __extension__ __PRETTY_FUNCTION__));

    if (TAX->getFeaturesStr() != TAY->getFeaturesStr())
      return false;
  }

  ASTContext &C = FuncX->getASTContext();
  auto GetTypeAsWritten = [](const FunctionDecl *FD) {
    // Map to the first declaration that we've already merged into this one.
    // The TSI of redeclarations might not match (due to calling conventions
    // being inherited onto the type but not the TSI), but the TSI type of
    // the first declaration of the function should match across modules.
    FD = FD->getCanonicalDecl();
    return FD->getTypeSourceInfo() ? FD->getTypeSourceInfo()->getType()
                                   : FD->getType();
  };
  QualType XT = GetTypeAsWritten(FuncX), YT = GetTypeAsWritten(FuncY);
  if (!C.hasSameType(XT, YT)) {
    // We can get functions with different types on the redecl chain in C++17
    // if they have differing exception specifications and at least one of
    // the excpetion specs is unresolved.
    auto *XFPT = XT->getAs<FunctionProtoType>();
    auto *YFPT = YT->getAs<FunctionProtoType>();
    if (C.getLangOpts().CPlusPlus17 && XFPT && YFPT &&
        (isUnresolvedExceptionSpec(XFPT->getExceptionSpecType()) ||
         isUnresolvedExceptionSpec(YFPT->getExceptionSpecType())) &&
        C.hasSameFunctionTypeIgnoringExceptionSpec(XT, YT))
      return true;
    return false;
  }
  return FuncX->getLinkageInternal() == FuncY->getLinkageInternal() &&
         hasSameOverloadableAttrs(FuncX, FuncY);
}

// Variables with the same type and linkage match.
if (const auto *VarX = dyn_cast<VarDecl>(X)) {
  const auto *VarY = cast<VarDecl>(Y);
  if (VarX->getLinkageInternal() == VarY->getLinkageInternal()) {
    ASTContext &C = VarX->getASTContext();
    if (C.hasSameType(VarX->getType(), VarY->getType()))
      return true;

    // We can get decls with different types on the redecl chain. Eg.
    // template <typename T> struct S { static T Var[]; }; // #1
    // template <typename T> T S<T>::Var[sizeof(T)]; // #2
    // Only? happens when completing an incomplete array type. In this case
    // when comparing #1 and #2 we should go through their element type.
    const ArrayType *VarXTy = C.getAsArrayType(VarX->getType());
    const ArrayType *VarYTy = C.getAsArrayType(VarY->getType());
    if (!VarXTy || !VarYTy)
      return false;
    if (VarXTy->isIncompleteArrayType() || VarYTy->isIncompleteArrayType())
      return C.hasSameType(VarXTy->getElementType(), VarYTy->getElementType());
  }
  return false;
}

// Namespaces with the same name and inlinedness match.
if (const auto *NamespaceX = dyn_cast<NamespaceDecl>(X)) {
  const auto *NamespaceY = cast<NamespaceDecl>(Y);
  return NamespaceX->isInline() == NamespaceY->isInline();
}

// Identical template names and kinds match if their template parameter lists
// and patterns match.
if (const auto *TemplateX = dyn_cast<TemplateDecl>(X)) {
  const auto *TemplateY = cast<TemplateDecl>(Y);
  return isSameEntity(TemplateX->getTemplatedDecl(),
                      TemplateY->getTemplatedDecl()) &&
         isSameTemplateParameterList(TemplateX->getTemplateParameters(),
                                     TemplateY->getTemplateParameters());
}

// Fields with the same name and the same type match.
if (const auto *FDX = dyn_cast<FieldDecl>(X)) {
  const auto *FDY = cast<FieldDecl>(Y);
  // FIXME: Also check the bitwidth is odr-equivalent, if any.
  return X->getASTContext().hasSameType(FDX->getType(), FDY->getType());
}

// Indirect fields with the same target field match.
if (const auto *IFDX = dyn_cast<IndirectFieldDecl>(X)) {
  const auto *IFDY = cast<IndirectFieldDecl>(Y);
  return IFDX->getAnonField()->getCanonicalDecl() ==
         IFDY->getAnonField()->getCanonicalDecl();
}

// Enumerators with the same name match.
if (isa<EnumConstantDecl>(X))
  // FIXME: Also check the value is odr-equivalent.
  return true;

// Using shadow declarations with the same target match.
if (const auto *USX = dyn_cast<UsingShadowDecl>(X)) {
  const auto *USY = cast<UsingShadowDecl>(Y);
  return USX->getTargetDecl() == USY->getTargetDecl();
}

// Using declarations with the same qualifier match. (We already know that
// the name matches.)
if (const auto *UX = dyn_cast<UsingDecl>(X)) {
  const auto *UY = cast<UsingDecl>(Y);
  return isSameQualifier(UX->getQualifier(), UY->getQualifier()) &&
         UX->hasTypename() == UY->hasTypename() &&
         UX->isAccessDeclaration() == UY->isAccessDeclaration();
}
if (const auto *UX = dyn_cast<UnresolvedUsingValueDecl>(X)) {
  const auto *UY = cast<UnresolvedUsingValueDecl>(Y);
  return isSameQualifier(UX->getQualifier(), UY->getQualifier()) &&
         UX->isAccessDeclaration() == UY->isAccessDeclaration();
}
if (const auto *UX = dyn_cast<UnresolvedUsingTypenameDecl>(X))
  return isSameQualifier(
      UX->getQualifier(),
      cast<UnresolvedUsingTypenameDecl>(Y)->getQualifier());

// Namespace alias definitions with the same target match.
if (const auto *NAX = dyn_cast<NamespaceAliasDecl>(X)) {
  const auto *NAY = cast<NamespaceAliasDecl>(Y);
  return NAX->getNamespace()->Equals(NAY->getNamespace());
}

return false;
3053}

3055/// Find the context in which we should search for previous declarations when
3056/// looking for declarations to merge.
3057DeclContext *ASTDeclReader::getPrimaryContextForMerging(ASTReader &Reader,
                                                      DeclContext *DC) {
if (auto *ND = dyn_cast<NamespaceDecl>(DC))
  return ND->getOriginalNamespace();

if (auto *RD = dyn_cast<CXXRecordDecl>(DC)) {
  // Try to dig out the definition.
  auto *DD = RD->DefinitionData;
  if (!DD)
    DD = RD->getCanonicalDecl()->DefinitionData;

  // If there's no definition yet, then DC's definition is added by an update
  // record, but we've not yet loaded that update record. In this case, we
  // commit to DC being the canonical definition now, and will fix this when
  // we load the update record.
  if (!DD) {
    DD = new (Reader.getContext()) struct CXXRecordDecl::DefinitionData(RD);
    RD->IsCompleteDefinition = true;
    RD->DefinitionData = DD;
    RD->getCanonicalDecl()->DefinitionData = DD;

    // Track that we did this horrible thing so that we can fix it later.
    Reader.PendingFakeDefinitionData.insert(
        std::make_pair(DD, ASTReader::PendingFakeDefinitionKind::Fake));
  }

  return DD->Definition;
}

if (auto *ED = dyn_cast<EnumDecl>(DC))
  return ED->getASTContext().getLangOpts().CPlusPlus? ED->getDefinition()
                                                    : nullptr;

// We can see the TU here only if we have no Sema object. In that case,
// there's no TU scope to look in, so using the DC alone is sufficient.
if (auto *TU = dyn_cast<TranslationUnitDecl>(DC))
  return TU;

return nullptr;
3096}

3098ASTDeclReader::FindExistingResult::~FindExistingResult() {
// Record that we had a typedef name for linkage whether or not we merge
// with that declaration.
if (TypedefNameForLinkage) {
  DeclContext *DC = New->getDeclContext()->getRedeclContext();
  Reader.ImportedTypedefNamesForLinkage.insert(
      std::make_pair(std::make_pair(DC, TypedefNameForLinkage), New));
  return;
}

if (!AddResult || Existing)
  return;

DeclarationName Name = New->getDeclName();
DeclContext *DC = New->getDeclContext()->getRedeclContext();
if (needsAnonymousDeclarationNumber(New)) {
  setAnonymousDeclForMerging(Reader, New->getLexicalDeclContext(),
                             AnonymousDeclNumber, New);
} else if (DC->isTranslationUnit() &&
           !Reader.getContext().getLangOpts().CPlusPlus) {
  if (Reader.getIdResolver().tryAddTopLevelDecl(New, Name))
    Reader.PendingFakeLookupResults[Name.getAsIdentifierInfo()]
          .push_back(New);
} else if (DeclContext *MergeDC = getPrimaryContextForMerging(Reader, DC)) {
  // Add the declaration to its redeclaration context so later merging
  // lookups will find it.
  MergeDC->makeDeclVisibleInContextImpl(New, /*Internal*/true);
}
3126}

3128/// Find the declaration that should be merged into, given the declaration found
3129/// by name lookup. If we're merging an anonymous declaration within a typedef,
3130/// we need a matching typedef, and we merge with the type inside it.
3131static NamedDecl *getDeclForMerging(NamedDecl *Found,
                                  bool IsTypedefNameForLinkage) {
if (!IsTypedefNameForLinkage)
  return Found;

// If we found a typedef declaration that gives a name to some other
// declaration, then we want that inner declaration. Declarations from
// AST files are handled via ImportedTypedefNamesForLinkage.
if (Found->isFromASTFile())
  return nullptr;

if (auto *TND = dyn_cast<TypedefNameDecl>(Found))
  return TND->getAnonDeclWithTypedefName(/*AnyRedecl*/true);

return nullptr;
3146}

3148/// Find the declaration to use to populate the anonymous declaration table
3149/// for the given lexical DeclContext. We only care about finding local
3150/// definitions of the context; we'll merge imported ones as we go.
3151DeclContext *
3152ASTDeclReader::getPrimaryDCForAnonymousDecl(DeclContext *LexicalDC) {
// For classes, we track the definition as we merge.
if (auto *RD = dyn_cast<CXXRecordDecl>(LexicalDC)) {
  auto *DD = RD->getCanonicalDecl()->DefinitionData;
  return DD ? DD->Definition : nullptr;
}

// For anything else, walk its merged redeclarations looking for a definition.
// Note that we can't just call getDefinition here because the redeclaration
// chain isn't wired up.
for (auto *D : merged_redecls(cast<Decl>(LexicalDC))) {
  if (auto *FD = dyn_cast<FunctionDecl>(D))
    if (FD->isThisDeclarationADefinition())
      return FD;
  if (auto *MD = dyn_cast<ObjCMethodDecl>(D))
    if (MD->isThisDeclarationADefinition())
      return MD;
}

// No merged definition yet.
return nullptr;
3173}

3175NamedDecl *ASTDeclReader::getAnonymousDeclForMerging(ASTReader &Reader,
                                                   DeclContext *DC,
                                                   unsigned Index) {
// If the lexical context has been merged, look into the now-canonical
// definition.
auto *CanonDC = cast<Decl>(DC)->getCanonicalDecl();

// If we've seen this before, return the canonical declaration.
auto &Previous = Reader.AnonymousDeclarationsForMerging[CanonDC];
if (Index < Previous.size() && Previous[Index])
  return Previous[Index];

// If this is the first time, but we have parsed a declaration of the context,
// build the anonymous declaration list from the parsed declaration.
auto *PrimaryDC = getPrimaryDCForAnonymousDecl(DC);
if (PrimaryDC && !cast<Decl>(PrimaryDC)->isFromASTFile()) {
  numberAnonymousDeclsWithin(PrimaryDC, [&](NamedDecl *ND, unsigned Number) {
    if (Previous.size() == Number)
      Previous.push_back(cast<NamedDecl>(ND->getCanonicalDecl()));
    else
      Previous[Number] = cast<NamedDecl>(ND->getCanonicalDecl());
  });
}

return Index < Previous.size() ? Previous[Index] : nullptr;
3200}

3202void ASTDeclReader::setAnonymousDeclForMerging(ASTReader &Reader,
                                             DeclContext *DC, unsigned Index,
                                             NamedDecl *D) {
auto *CanonDC = cast<Decl>(DC)->getCanonicalDecl();

auto &Previous = Reader.AnonymousDeclarationsForMerging[CanonDC];
if (Index >= Previous.size())
  Previous.resize(Index + 1);
if (!Previous[Index])
  Previous[Index] = D;
3212}

3214ASTDeclReader::FindExistingResult ASTDeclReader::findExisting(NamedDecl *D) {
DeclarationName Name = TypedefNameForLinkage ? TypedefNameForLinkage
                                             : D->getDeclName();

if (!Name && !needsAnonymousDeclarationNumber(D)) {
  // Don't bother trying to find unnamed declarations that are in
  // unmergeable contexts.
  FindExistingResult Result(Reader, D, /*Existing=*/nullptr,
                            AnonymousDeclNumber, TypedefNameForLinkage);
  Result.suppress();
  return Result;
}

DeclContext *DC = D->getDeclContext()->getRedeclContext();
if (TypedefNameForLinkage) {
  auto It = Reader.ImportedTypedefNamesForLinkage.find(
      std::make_pair(DC, TypedefNameForLinkage));
  if (It != Reader.ImportedTypedefNamesForLinkage.end())
    if (isSameEntity(It->second, D))
      return FindExistingResult(Reader, D, It->second, AnonymousDeclNumber,
                                TypedefNameForLinkage);
  // Go on to check in other places in case an existing typedef name
  // was not imported.
}

if (needsAnonymousDeclarationNumber(D)) {
  // This is an anonymous declaration that we may need to merge. Look it up
  // in its context by number.
  if (auto *Existing = getAnonymousDeclForMerging(
          Reader, D->getLexicalDeclContext(), AnonymousDeclNumber))
    if (isSameEntity(Existing, D))
      return FindExistingResult(Reader, D, Existing, AnonymousDeclNumber,
                                TypedefNameForLinkage);
} else if (DC->isTranslationUnit() &&
           !Reader.getContext().getLangOpts().CPlusPlus) {
  IdentifierResolver &IdResolver = Reader.getIdResolver();

  // Temporarily consider the identifier to be up-to-date. We don't want to
  // cause additional lookups here.
  class UpToDateIdentifierRAII {
    IdentifierInfo *II;
    bool WasOutToDate = false;

  public:
    explicit UpToDateIdentifierRAII(IdentifierInfo *II) : II(II) {
      if (II) {
        WasOutToDate = II->isOutOfDate();
        if (WasOutToDate)
          II->setOutOfDate(false);
      }
    }

    ~UpToDateIdentifierRAII() {
      if (WasOutToDate)
        II->setOutOfDate(true);
    }
  } UpToDate(Name.getAsIdentifierInfo());

  for (IdentifierResolver::iterator I = IdResolver.begin(Name), 
                                 IEnd = IdResolver.end();
       I != IEnd; ++I) {
    if (NamedDecl *Existing = getDeclForMerging(*I, TypedefNameForLinkage))
      if (isSameEntity(Existing, D))
        return FindExistingResult(Reader, D, Existing, AnonymousDeclNumber,
                                  TypedefNameForLinkage);
  }
} else if (DeclContext *MergeDC = getPrimaryContextForMerging(Reader, DC)) {
  DeclContext::lookup_result R = MergeDC->noload_lookup(Name);
  for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) {
    if (NamedDecl *Existing = getDeclForMerging(*I, TypedefNameForLinkage))
      if (isSameEntity(Existing, D))
        return FindExistingResult(Reader, D, Existing, AnonymousDeclNumber,
                                  TypedefNameForLinkage);
  }
} else {
  // Not in a mergeable context.
  return FindExistingResult(Reader);
}

// If this declaration is from a merged context, make a note that we need to
// check that the canonical definition of that context contains the decl.
//
// FIXME: We should do something similar if we merge two definitions of the
// same template specialization into the same CXXRecordDecl.
auto MergedDCIt = Reader.MergedDeclContexts.find(D->getLexicalDeclContext());
if (MergedDCIt != Reader.MergedDeclContexts.end() &&
    MergedDCIt->second == D->getDeclContext())
  Reader.PendingOdrMergeChecks.push_back(D);

return FindExistingResult(Reader, D, /*Existing=*/nullptr,
                          AnonymousDeclNumber, TypedefNameForLinkage);
3305}

3307template<typename DeclT>
3308Decl *ASTDeclReader::getMostRecentDeclImpl(Redeclarable<DeclT> *D) {
return D->RedeclLink.getLatestNotUpdated();
3310}

3312Decl *ASTDeclReader::getMostRecentDeclImpl(...) {
llvm_unreachable("getMostRecentDecl on non-redeclarable declaration")::llvm::llvm_unreachable_internal("getMostRecentDecl on non-redeclarable declaration"
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 3313);
3314}

3316Decl *ASTDeclReader::getMostRecentDecl(Decl *D) {
assert(D)(static_cast <bool> (D) ? void (0) : __assert_fail ("D"
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 3317, __extension__ __PRETTY_FUNCTION__));

switch (D->getKind()) {
3320#define ABSTRACT_DECL(TYPE)
3321#define DECL(TYPE, BASE)                               \
case Decl::TYPE:                                     \
  return getMostRecentDeclImpl(cast<TYPE##Decl>(D));
3324#include "clang/AST/DeclNodes.inc"
}
llvm_unreachable("unknown decl kind")::llvm::llvm_unreachable_internal("unknown decl kind", "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 3326);
3327}

3329Decl *ASTReader::getMostRecentExistingDecl(Decl *D) {
return ASTDeclReader::getMostRecentDecl(D->getCanonicalDecl());
3331}

3333template<typename DeclT>
3334void ASTDeclReader::attachPreviousDeclImpl(ASTReader &Reader,
                                         Redeclarable<DeclT> *D,
                                         Decl *Previous, Decl *Canon) {
D->RedeclLink.setPrevious(cast<DeclT>(Previous));
D->First = cast<DeclT>(Previous)->First;
3339}

3341namespace clang {

3343template<>
3344void ASTDeclReader::attachPreviousDeclImpl(ASTReader &Reader,
                                         Redeclarable<VarDecl> *D,
                                         Decl *Previous, Decl *Canon) {
auto *VD = static_cast<VarDecl *>(D);
auto *PrevVD = cast<VarDecl>(Previous);
D->RedeclLink.setPrevious(PrevVD);
D->First = PrevVD->First;

// We should keep at most one definition on the chain.
// FIXME: Cache the definition once we've found it. Building a chain with
// N definitions currently takes O(N^2) time here.
if (VD->isThisDeclarationADefinition() == VarDecl::Definition) {
  for (VarDecl *CurD = PrevVD; CurD; CurD = CurD->getPreviousDecl()) {
    if (CurD->isThisDeclarationADefinition() == VarDecl::Definition) {
      Reader.mergeDefinitionVisibility(CurD, VD);
      VD->demoteThisDefinitionToDeclaration();
      break;
    }
  }
}
3364}

3366template<>
3367void ASTDeclReader::attachPreviousDeclImpl(ASTReader &Reader,
                                         Redeclarable<FunctionDecl> *D,
                                         Decl *Previous, Decl *Canon) {
auto *FD = static_cast<FunctionDecl *>(D);
auto *PrevFD = cast<FunctionDecl>(Previous);

FD->RedeclLink.setPrevious(PrevFD);
FD->First = PrevFD->First;

// If the previous declaration is an inline function declaration, then this
// declaration is too.
if (PrevFD->IsInline != FD->IsInline) {
  // FIXME: [dcl.fct.spec]p4:
  //   If a function with external linkage is declared inline in one
  //   translation unit, it shall be declared inline in all translation
  //   units in which it appears.
  //
  // Be careful of this case:
  //
  // module A:
  //   template<typename T> struct X { void f(); };
  //   template<typename T> inline void X<T>::f() {}
  //
  // module B instantiates the declaration of X<int>::f
  // module C instantiates the definition of X<int>::f
  //
  // If module B and C are merged, we do not have a violation of this rule.
  FD->IsInline = true;
}

// If we need to propagate an exception specification along the redecl
// chain, make a note of that so that we can do so later.
auto *FPT = FD->getType()->getAs<FunctionProtoType>();
auto *PrevFPT = PrevFD->getType()->getAs<FunctionProtoType>();
if (FPT && PrevFPT) {
  bool IsUnresolved = isUnresolvedExceptionSpec(FPT->getExceptionSpecType());
  bool WasUnresolved =
      isUnresolvedExceptionSpec(PrevFPT->getExceptionSpecType());
  if (IsUnresolved != WasUnresolved)
    Reader.PendingExceptionSpecUpdates.insert(
        std::make_pair(Canon, IsUnresolved ? PrevFD : FD));
}
3409}

3411} // namespace clang

3413void ASTDeclReader::attachPreviousDeclImpl(ASTReader &Reader, ...) {
llvm_unreachable("attachPreviousDecl on non-redeclarable declaration")::llvm::llvm_unreachable_internal("attachPreviousDecl on non-redeclarable declaration"
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 3414);
3415}

3417/// Inherit the default template argument from \p From to \p To. Returns
3418/// \c false if there is no default template for \p From.
3419template <typename ParmDecl>
3420static bool inheritDefaultTemplateArgument(ASTContext &Context, ParmDecl *From,
                                         Decl *ToD) {
auto *To = cast<ParmDecl>(ToD);
if (!From->hasDefaultArgument())
  return false;
To->setInheritedDefaultArgument(Context, From);
return true;
3427}

3429static void inheritDefaultTemplateArguments(ASTContext &Context,
                                          TemplateDecl *From,
                                          TemplateDecl *To) {
auto *FromTP = From->getTemplateParameters();
auto *ToTP = To->getTemplateParameters();
assert(FromTP->size() == ToTP->size() && "merged mismatched templates?")(static_cast <bool> (FromTP->size() == ToTP->size
() && "merged mismatched templates?") ? void (0) : __assert_fail
 ("FromTP->size() == ToTP->size() && \"merged mismatched templates?\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 3434, __extension__ __PRETTY_FUNCTION__));

for (unsigned I = 0, N = FromTP->size(); I != N; ++I) {
  NamedDecl *FromParam = FromTP->getParam(N - I - 1);
  if (FromParam->isParameterPack())
    continue;
  NamedDecl *ToParam = ToTP->getParam(N - I - 1);

  if (auto *FTTP = dyn_cast<TemplateTypeParmDecl>(FromParam)) {
    if (!inheritDefaultTemplateArgument(Context, FTTP, ToParam))
      break;
  } else if (auto *FNTTP = dyn_cast<NonTypeTemplateParmDecl>(FromParam)) {
    if (!inheritDefaultTemplateArgument(Context, FNTTP, ToParam))
      break;
  } else {
    if (!inheritDefaultTemplateArgument(
            Context, cast<TemplateTemplateParmDecl>(FromParam), ToParam))
      break;
  }
}
3454}

3456void ASTDeclReader::attachPreviousDecl(ASTReader &Reader, Decl *D,
                                     Decl *Previous, Decl *Canon) {
assert(D && Previous)(static_cast <bool> (D && Previous) ? void (0) :
 __assert_fail ("D && Previous", "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 3458, __extension__ __PRETTY_FUNCTION__));

switch (D->getKind()) {
3461#define ABSTRACT_DECL(TYPE)
3462#define DECL(TYPE, BASE)                                                  \
case Decl::TYPE:                                                        \
  attachPreviousDeclImpl(Reader, cast<TYPE##Decl>(D), Previous, Canon); \
  break;
3466#include "clang/AST/DeclNodes.inc"
}

// If the declaration was visible in one module, a redeclaration of it in
// another module remains visible even if it wouldn't be visible by itself.
//
// FIXME: In this case, the declaration should only be visible if a module
//        that makes it visible has been imported.
D->IdentifierNamespace |=
    Previous->IdentifierNamespace &
    (Decl::IDNS_Ordinary | Decl::IDNS_Tag | Decl::IDNS_Type);

// If the declaration declares a template, it may inherit default arguments
// from the previous declaration.
if (auto *TD = dyn_cast<TemplateDecl>(D))
  inheritDefaultTemplateArguments(Reader.getContext(),
                                  cast<TemplateDecl>(Previous), TD);
3483}

3485template<typename DeclT>
3486void ASTDeclReader::attachLatestDeclImpl(Redeclarable<DeclT> *D, Decl *Latest) {
D->RedeclLink.setLatest(cast<DeclT>(Latest));
3488}

3490void ASTDeclReader::attachLatestDeclImpl(...) {
llvm_unreachable("attachLatestDecl on non-redeclarable declaration")::llvm::llvm_unreachable_internal("attachLatestDecl on non-redeclarable declaration"
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 3491);
3492}

3494void ASTDeclReader::attachLatestDecl(Decl *D, Decl *Latest) {
assert(D && Latest)(static_cast <bool> (D && Latest) ? void (0) : __assert_fail
 ("D && Latest", "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 3495, __extension__ __PRETTY_FUNCTION__));

switch (D->getKind()) {
3498#define ABSTRACT_DECL(TYPE)
3499#define DECL(TYPE, BASE)                                  \
case Decl::TYPE:                                        \
  attachLatestDeclImpl(cast<TYPE##Decl>(D), Latest); \
  break;
3503#include "clang/AST/DeclNodes.inc"
}
3505}

3507template<typename DeclT>
3508void ASTDeclReader::markIncompleteDeclChainImpl(Redeclarable<DeclT> *D) {
D->RedeclLink.markIncomplete();
3510}

3512void ASTDeclReader::markIncompleteDeclChainImpl(...) {
llvm_unreachable("markIncompleteDeclChain on non-redeclarable declaration")::llvm::llvm_unreachable_internal("markIncompleteDeclChain on non-redeclarable declaration"
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 3513);
3514}

3516void ASTReader::markIncompleteDeclChain(Decl *D) {
switch (D->getKind()) {
3518#define ABSTRACT_DECL(TYPE)
3519#define DECL(TYPE, BASE)                                             \
case Decl::TYPE:                                                   \
  ASTDeclReader::markIncompleteDeclChainImpl(cast<TYPE##Decl>(D)); \
  break;
3523#include "clang/AST/DeclNodes.inc"
}
3525}

3527/// Read the declaration at the given offset from the AST file.
3528Decl *ASTReader::ReadDeclRecord(DeclID ID) {
unsigned Index = ID - NUM_PREDEF_DECL_IDS;
SourceLocation DeclLoc;
RecordLocation Loc = DeclCursorForID(ID, DeclLoc);
llvm::BitstreamCursor &DeclsCursor = Loc.F->DeclsCursor;
// Keep track of where we are in the stream, then jump back there
// after reading this declaration.
SavedStreamPosition SavedPosition(DeclsCursor);

ReadingKindTracker ReadingKind(Read_Decl, *this);

// Note that we are loading a declaration record.
Deserializing ADecl(this);

DeclsCursor.JumpToBit(Loc.Offset);
ASTRecordReader Record(*this, *Loc.F);
ASTDeclReader Reader(*this, Record, Loc, ID, DeclLoc);
unsigned Code = DeclsCursor.ReadCode();

ASTContext &Context = getContext();
Decl *D = nullptr;
switch ((DeclCode)Record.readRecord(DeclsCursor, Code)) {
case DECL_CONTEXT_LEXICAL:
case DECL_CONTEXT_VISIBLE:
  llvm_unreachable("Record cannot be de-serialized with ReadDeclRecord")::llvm::llvm_unreachable_internal("Record cannot be de-serialized with ReadDeclRecord"
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 3552);
case DECL_TYPEDEF:
  D = TypedefDecl::CreateDeserialized(Context, ID);
  break;
case DECL_TYPEALIAS:
  D = TypeAliasDecl::CreateDeserialized(Context, ID);
  break;
case DECL_ENUM:
  D = EnumDecl::CreateDeserialized(Context, ID);
  break;
case DECL_RECORD:
  D = RecordDecl::CreateDeserialized(Context, ID);
  break;
case DECL_ENUM_CONSTANT:
  D = EnumConstantDecl::CreateDeserialized(Context, ID);
  break;
case DECL_FUNCTION:
  D = FunctionDecl::CreateDeserialized(Context, ID);
  break;
case DECL_LINKAGE_SPEC:
  D = LinkageSpecDecl::CreateDeserialized(Context, ID);
  break;
case DECL_EXPORT:
  D = ExportDecl::CreateDeserialized(Context, ID);
  break;
case DECL_LABEL:
  D = LabelDecl::CreateDeserialized(Context, ID);
  break;
case DECL_NAMESPACE:
  D = NamespaceDecl::CreateDeserialized(Context, ID);
  break;
case DECL_NAMESPACE_ALIAS:
  D = NamespaceAliasDecl::CreateDeserialized(Context, ID);
  break;
case DECL_USING:
  D = UsingDecl::CreateDeserialized(Context, ID);
  break;
case DECL_USING_PACK:
  D = UsingPackDecl::CreateDeserialized(Context, ID, Record.readInt());
  break;
case DECL_USING_SHADOW:
  D = UsingShadowDecl::CreateDeserialized(Context, ID);
  break;
case DECL_CONSTRUCTOR_USING_SHADOW:
  D = ConstructorUsingShadowDecl::CreateDeserialized(Context, ID);
  break;
case DECL_USING_DIRECTIVE:
  D = UsingDirectiveDecl::CreateDeserialized(Context, ID);
  break;
case DECL_UNRESOLVED_USING_VALUE:
  D = UnresolvedUsingValueDecl::CreateDeserialized(Context, ID);
  break;
case DECL_UNRESOLVED_USING_TYPENAME:
  D = UnresolvedUsingTypenameDecl::CreateDeserialized(Context, ID);
  break;
case DECL_CXX_RECORD:
  D = CXXRecordDecl::CreateDeserialized(Context, ID);
  break;
case DECL_CXX_DEDUCTION_GUIDE:
  D = CXXDeductionGuideDecl::CreateDeserialized(Context, ID);
  break;
case DECL_CXX_METHOD:
  D = CXXMethodDecl::CreateDeserialized(Context, ID);
  break;
case DECL_CXX_CONSTRUCTOR:
  D = CXXConstructorDecl::CreateDeserialized(Context, ID, false);
  break;
case DECL_CXX_INHERITED_CONSTRUCTOR:
  D = CXXConstructorDecl::CreateDeserialized(Context, ID, true);
  break;
case DECL_CXX_DESTRUCTOR:
  D = CXXDestructorDecl::CreateDeserialized(Context, ID);
  break;
case DECL_CXX_CONVERSION:
  D = CXXConversionDecl::CreateDeserialized(Context, ID);
  break;
case DECL_ACCESS_SPEC:
  D = AccessSpecDecl::CreateDeserialized(Context, ID);
  break;
case DECL_FRIEND:
  D = FriendDecl::CreateDeserialized(Context, ID, Record.readInt());
  break;
case DECL_FRIEND_TEMPLATE:
  D = FriendTemplateDecl::CreateDeserialized(Context, ID);
  break;
case DECL_CLASS_TEMPLATE:
  D = ClassTemplateDecl::CreateDeserialized(Context, ID);
  break;
case DECL_CLASS_TEMPLATE_SPECIALIZATION:
  D = ClassTemplateSpecializationDecl::CreateDeserialized(Context, ID);
  break;
case DECL_CLASS_TEMPLATE_PARTIAL_SPECIALIZATION:
  D = ClassTemplatePartialSpecializationDecl::CreateDeserialized(Context, ID);
  break;
case DECL_VAR_TEMPLATE:
  D = VarTemplateDecl::CreateDeserialized(Context, ID);
  break;
case DECL_VAR_TEMPLATE_SPECIALIZATION:
  D = VarTemplateSpecializationDecl::CreateDeserialized(Context, ID);
  break;
case DECL_VAR_TEMPLATE_PARTIAL_SPECIALIZATION:
  D = VarTemplatePartialSpecializationDecl::CreateDeserialized(Context, ID);
  break;
case DECL_CLASS_SCOPE_FUNCTION_SPECIALIZATION:
  D = ClassScopeFunctionSpecializationDecl::CreateDeserialized(Context, ID);
  break;
case DECL_FUNCTION_TEMPLATE:
  D = FunctionTemplateDecl::CreateDeserialized(Context, ID);
  break;
case DECL_TEMPLATE_TYPE_PARM:
  D = TemplateTypeParmDecl::CreateDeserialized(Context, ID);
  break;
case DECL_NON_TYPE_TEMPLATE_PARM:
  D = NonTypeTemplateParmDecl::CreateDeserialized(Context, ID);
  break;
case DECL_EXPANDED_NON_TYPE_TEMPLATE_PARM_PACK:
  D = NonTypeTemplateParmDecl::CreateDeserialized(Context, ID,
                                                  Record.readInt());
  break;
case DECL_TEMPLATE_TEMPLATE_PARM:
  D = TemplateTemplateParmDecl::CreateDeserialized(Context, ID);
  break;
case DECL_EXPANDED_TEMPLATE_TEMPLATE_PARM_PACK:
  D = TemplateTemplateParmDecl::CreateDeserialized(Context, ID,
                                                   Record.readInt());
  break;
case DECL_TYPE_ALIAS_TEMPLATE:
  D = TypeAliasTemplateDecl::CreateDeserialized(Context, ID);
  break;
case DECL_STATIC_ASSERT:
  D = StaticAssertDecl::CreateDeserialized(Context, ID);
  break;
case DECL_OBJC_METHOD:
  D = ObjCMethodDecl::CreateDeserialized(Context, ID);
  break;
case DECL_OBJC_INTERFACE:
  D = ObjCInterfaceDecl::CreateDeserialized(Context, ID);
  break;
case DECL_OBJC_IVAR:
  D = ObjCIvarDecl::CreateDeserialized(Context, ID);
  break;
case DECL_OBJC_PROTOCOL:
  D = ObjCProtocolDecl::CreateDeserialized(Context, ID);
  break;
case DECL_OBJC_AT_DEFS_FIELD:
  D = ObjCAtDefsFieldDecl::CreateDeserialized(Context, ID);
  break;
case DECL_OBJC_CATEGORY:
  D = ObjCCategoryDecl::CreateDeserialized(Context, ID);
  break;
case DECL_OBJC_CATEGORY_IMPL:
  D = ObjCCategoryImplDecl::CreateDeserialized(Context, ID);
  break;
case DECL_OBJC_IMPLEMENTATION:
  D = ObjCImplementationDecl::CreateDeserialized(Context, ID);
  break;
case DECL_OBJC_COMPATIBLE_ALIAS:
  D = ObjCCompatibleAliasDecl::CreateDeserialized(Context, ID);
  break;
case DECL_OBJC_PROPERTY:
  D = ObjCPropertyDecl::CreateDeserialized(Context, ID);
  break;
case DECL_OBJC_PROPERTY_IMPL:
  D = ObjCPropertyImplDecl::CreateDeserialized(Context, ID);
  break;
case DECL_FIELD:
  D = FieldDecl::CreateDeserialized(Context, ID);
  break;
case DECL_INDIRECTFIELD:
  D = IndirectFieldDecl::CreateDeserialized(Context, ID);
  break;
case DECL_VAR:
  D = VarDecl::CreateDeserialized(Context, ID);
  break;
case DECL_IMPLICIT_PARAM:
  D = ImplicitParamDecl::CreateDeserialized(Context, ID);
  break;
case DECL_PARM_VAR:
  D = ParmVarDecl::CreateDeserialized(Context, ID);
  break;
case DECL_DECOMPOSITION:
  D = DecompositionDecl::CreateDeserialized(Context, ID, Record.readInt());
  break;
case DECL_BINDING:
  D = BindingDecl::CreateDeserialized(Context, ID);
  break;
case DECL_FILE_SCOPE_ASM:
  D = FileScopeAsmDecl::CreateDeserialized(Context, ID);
  break;
case DECL_BLOCK:
  D = BlockDecl::CreateDeserialized(Context, ID);
  break;
case DECL_MS_PROPERTY:
  D = MSPropertyDecl::CreateDeserialized(Context, ID);
  break;
case DECL_CAPTURED:
  D = CapturedDecl::CreateDeserialized(Context, ID, Record.readInt());
  break;
case DECL_CXX_BASE_SPECIFIERS:
  Error("attempt to read a C++ base-specifier record as a declaration");
  return nullptr;
case DECL_CXX_CTOR_INITIALIZERS:
  Error("attempt to read a C++ ctor initializer record as a declaration");
  return nullptr;
case DECL_IMPORT:
  // Note: last entry of the ImportDecl record is the number of stored source 
  // locations.
  D = ImportDecl::CreateDeserialized(Context, ID, Record.back());
  break;
case DECL_OMP_THREADPRIVATE:
  D = OMPThreadPrivateDecl::CreateDeserialized(Context, ID, Record.readInt());
  break;
case DECL_OMP_DECLARE_REDUCTION:
  D = OMPDeclareReductionDecl::CreateDeserialized(Context, ID);
  break;
case DECL_OMP_CAPTUREDEXPR:
  D = OMPCapturedExprDecl::CreateDeserialized(Context, ID);
  break;
case DECL_PRAGMA_COMMENT:
  D = PragmaCommentDecl::CreateDeserialized(Context, ID, Record.readInt());
  break;
case DECL_PRAGMA_DETECT_MISMATCH:
  D = PragmaDetectMismatchDecl::CreateDeserialized(Context, ID,
                                                   Record.readInt());
  break;
case DECL_EMPTY:
  D = EmptyDecl::CreateDeserialized(Context, ID);
  break;
case DECL_OBJC_TYPE_PARAM:
  D = ObjCTypeParamDecl::CreateDeserialized(Context, ID);
  break;
}

assert(D && "Unknown declaration reading AST file")(static_cast <bool> (D && "Unknown declaration reading AST file"
) ? void (0) : __assert_fail ("D && \"Unknown declaration reading AST file\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 3785, __extension__ __PRETTY_FUNCTION__));
LoadedDecl(Index, D);
// Set the DeclContext before doing any deserialization, to make sure internal
// calls to Decl::getASTContext() by Decl's methods will find the
// TranslationUnitDecl without crashing.
D->setDeclContext(Context.getTranslationUnitDecl());
Reader.Visit(D);

// If this declaration is also a declaration context, get the
// offsets for its tables of lexical and visible declarations.
if (auto *DC = dyn_cast<DeclContext>(D)) {
  std::pair<uint64_t, uint64_t> Offsets = Reader.VisitDeclContext(DC);
  if (Offsets.first &&
      ReadLexicalDeclContextStorage(*Loc.F, DeclsCursor, Offsets.first, DC))
    return nullptr;
  if (Offsets.second &&
      ReadVisibleDeclContextStorage(*Loc.F, DeclsCursor, Offsets.second, ID))
    return nullptr;
}
assert(Record.getIdx() == Record.size())(static_cast <bool> (Record.getIdx() == Record.size()) ?
 void (0) : __assert_fail ("Record.getIdx() == Record.size()"
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 3804, __extension__ __PRETTY_FUNCTION__));

// Load any relevant update records.
PendingUpdateRecords.push_back(
    PendingUpdateRecord(ID, D, /*JustLoaded=*/true));

// Load the categories after recursive loading is finished.
if (auto *Class = dyn_cast<ObjCInterfaceDecl>(D))
  // If we already have a definition when deserializing the ObjCInterfaceDecl,
  // we put the Decl in PendingDefinitions so we can pull the categories here.
  if (Class->isThisDeclarationADefinition() ||
      PendingDefinitions.count(Class))
    loadObjCCategories(ID, Class);

// If we have deserialized a declaration that has a definition the
// AST consumer might need to know about, queue it.
// We don't pass it to the consumer immediately because we may be in recursive
// loading, and some declarations may still be initializing.
PotentiallyInterestingDecls.push_back(
    InterestingDecl(D, Reader.hasPendingBody()));

return D;
3826}

3828void ASTReader::PassInterestingDeclsToConsumer() {
assert(Consumer)(static_cast <bool> (Consumer) ? void (0) : __assert_fail
 ("Consumer", "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 3829, __extension__ __PRETTY_FUNCTION__));

if (PassingDeclsToConsumer)
  return;

// Guard variable to avoid recursively redoing the process of passing
// decls to consumer.
SaveAndRestore<bool> GuardPassingDeclsToConsumer(PassingDeclsToConsumer,
                                                 true);

// Ensure that we've loaded all potentially-interesting declarations
// that need to be eagerly loaded.
for (auto ID : EagerlyDeserializedDecls)
  GetDecl(ID);
EagerlyDeserializedDecls.clear();

while (!PotentiallyInterestingDecls.empty()) {
  InterestingDecl D = PotentiallyInterestingDecls.front();
  PotentiallyInterestingDecls.pop_front();
  if (isConsumerInterestedIn(getContext(), D.getDecl(), D.hasPendingBody()))
    PassInterestingDeclToConsumer(D.getDecl());
}
3851}

3853void ASTReader::loadDeclUpdateRecords(PendingUpdateRecord &Record) {
// The declaration may have been modified by files later in the chain.
// If this is the case, read the record containing the updates from each file
// and pass it to ASTDeclReader to make the modifications.
serialization::GlobalDeclID ID = Record.ID;
Decl *D = Record.D;
ProcessingUpdatesRAIIObj ProcessingUpdates(*this);
DeclUpdateOffsetsMap::iterator UpdI = DeclUpdateOffsets.find(ID);

SmallVector<serialization::DeclID, 8> PendingLazySpecializationIDs;

if (UpdI != DeclUpdateOffsets.end()) {
1
Assuming the condition is true→
2
←
Taking true branch→
  auto UpdateOffsets = std::move(UpdI->second);
  DeclUpdateOffsets.erase(UpdI);

  // Check if this decl was interesting to the consumer. If we just loaded
  // the declaration, then we know it was interesting and we skip the call
  // to isConsumerInterestedIn because it is unsafe to call in the
  // current ASTReader state.
  bool WasInteresting =
      Record.JustLoaded || isConsumerInterestedIn(getContext(), D, false);
3
←
Assuming the condition is true→
  for (auto &FileAndOffset : UpdateOffsets) {
4
←
Assuming '__begin2' is not equal to '__end2'→
    ModuleFile *F = FileAndOffset.first;
    uint64_t Offset = FileAndOffset.second;
    llvm::BitstreamCursor &Cursor = F->DeclsCursor;
    SavedStreamPosition SavedPosition(Cursor);
    Cursor.JumpToBit(Offset);
    unsigned Code = Cursor.ReadCode();
    ASTRecordReader Record(*this, *F);
    unsigned RecCode = Record.readRecord(Cursor, Code);
    (void)RecCode;
    assert(RecCode == DECL_UPDATES && "Expected DECL_UPDATES record!")(static_cast <bool> (RecCode == DECL_UPDATES &&
 "Expected DECL_UPDATES record!") ? void (0) : __assert_fail (
"RecCode == DECL_UPDATES && \"Expected DECL_UPDATES record!\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 3884, __extension__ __PRETTY_FUNCTION__));

    ASTDeclReader Reader(*this, Record, RecordLocation(F, Offset), ID,
                         SourceLocation());
    Reader.UpdateDecl(D, PendingLazySpecializationIDs);
5
←
Calling 'ASTDeclReader::UpdateDecl'→

    // We might have made this declaration interesting. If so, remember that
    // we need to hand it off to the consumer.
    if (!WasInteresting &&
        isConsumerInterestedIn(getContext(), D, Reader.hasPendingBody())) {
      PotentiallyInterestingDecls.push_back(
          InterestingDecl(D, Reader.hasPendingBody()));
      WasInteresting = true;
    }
  }
}
// Add the lazy specializations to the template.
assert((PendingLazySpecializationIDs.empty() || isa<ClassTemplateDecl>(D) ||(static_cast <bool> ((PendingLazySpecializationIDs.empty
() || isa<ClassTemplateDecl>(D) || isa<FunctionTemplateDecl
>(D) || isa<VarTemplateDecl>(D)) && "Must not have pending specializations"
) ? void (0) : __assert_fail ("(PendingLazySpecializationIDs.empty() || isa<ClassTemplateDecl>(D) || isa<FunctionTemplateDecl>(D) || isa<VarTemplateDecl>(D)) && \"Must not have pending specializations\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 3903, __extension__ __PRETTY_FUNCTION__))
        isa<FunctionTemplateDecl>(D) || isa<VarTemplateDecl>(D)) &&(static_cast <bool> ((PendingLazySpecializationIDs.empty
() || isa<ClassTemplateDecl>(D) || isa<FunctionTemplateDecl
>(D) || isa<VarTemplateDecl>(D)) && "Must not have pending specializations"
) ? void (0) : __assert_fail ("(PendingLazySpecializationIDs.empty() || isa<ClassTemplateDecl>(D) || isa<FunctionTemplateDecl>(D) || isa<VarTemplateDecl>(D)) && \"Must not have pending specializations\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 3903, __extension__ __PRETTY_FUNCTION__))
       "Must not have pending specializations")(static_cast <bool> ((PendingLazySpecializationIDs.empty
() || isa<ClassTemplateDecl>(D) || isa<FunctionTemplateDecl
>(D) || isa<VarTemplateDecl>(D)) && "Must not have pending specializations"
) ? void (0) : __assert_fail ("(PendingLazySpecializationIDs.empty() || isa<ClassTemplateDecl>(D) || isa<FunctionTemplateDecl>(D) || isa<VarTemplateDecl>(D)) && \"Must not have pending specializations\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 3903, __extension__ __PRETTY_FUNCTION__));
if (auto *CTD = dyn_cast<ClassTemplateDecl>(D))
  ASTDeclReader::AddLazySpecializations(CTD, PendingLazySpecializationIDs);
else if (auto *FTD = dyn_cast<FunctionTemplateDecl>(D))
  ASTDeclReader::AddLazySpecializations(FTD, PendingLazySpecializationIDs);
else if (auto *VTD = dyn_cast<VarTemplateDecl>(D))
  ASTDeclReader::AddLazySpecializations(VTD, PendingLazySpecializationIDs);
PendingLazySpecializationIDs.clear();

// Load the pending visible updates for this decl context, if it has any.
auto I = PendingVisibleUpdates.find(ID);
if (I != PendingVisibleUpdates.end()) {
  auto VisibleUpdates = std::move(I->second);
  PendingVisibleUpdates.erase(I);

  auto *DC = cast<DeclContext>(D)->getPrimaryContext();
  for (const auto &Update : VisibleUpdates)
    Lookups[DC].Table.add(
        Update.Mod, Update.Data,
        reader::ASTDeclContextNameLookupTrait(*this, *Update.Mod));
  DC->setHasExternalVisibleStorage(true);
}
3925}

3927void ASTReader::loadPendingDeclChain(Decl *FirstLocal, uint64_t LocalOffset) {
// Attach FirstLocal to the end of the decl chain.
Decl *CanonDecl = FirstLocal->getCanonicalDecl();
if (FirstLocal != CanonDecl) {
  Decl *PrevMostRecent = ASTDeclReader::getMostRecentDecl(CanonDecl);
  ASTDeclReader::attachPreviousDecl(
      *this, FirstLocal, PrevMostRecent ? PrevMostRecent : CanonDecl,
      CanonDecl);
}

if (!LocalOffset) {
  ASTDeclReader::attachLatestDecl(CanonDecl, FirstLocal);
  return;
}

// Load the list of other redeclarations from this module file.
ModuleFile *M = getOwningModuleFile(FirstLocal);
assert(M && "imported decl from no module file")(static_cast <bool> (M && "imported decl from no module file"
) ? void (0) : __assert_fail ("M && \"imported decl from no module file\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 3944, __extension__ __PRETTY_FUNCTION__));

llvm::BitstreamCursor &Cursor = M->DeclsCursor;
SavedStreamPosition SavedPosition(Cursor);
Cursor.JumpToBit(LocalOffset);

RecordData Record;
unsigned Code = Cursor.ReadCode();
unsigned RecCode = Cursor.readRecord(Code, Record);
(void)RecCode;
assert(RecCode == LOCAL_REDECLARATIONS && "expected LOCAL_REDECLARATIONS record!")(static_cast <bool> (RecCode == LOCAL_REDECLARATIONS &&
 "expected LOCAL_REDECLARATIONS record!") ? void (0) : __assert_fail
 ("RecCode == LOCAL_REDECLARATIONS && \"expected LOCAL_REDECLARATIONS record!\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 3954, __extension__ __PRETTY_FUNCTION__));

// FIXME: We have several different dispatches on decl kind here; maybe
// we should instead generate one loop per kind and dispatch up-front?
Decl *MostRecent = FirstLocal;
for (unsigned I = 0, N = Record.size(); I != N; ++I) {
  auto *D = GetLocalDecl(*M, Record[N - I - 1]);
  ASTDeclReader::attachPreviousDecl(*this, D, MostRecent, CanonDecl);
  MostRecent = D;
}
ASTDeclReader::attachLatestDecl(CanonDecl, MostRecent);
3965}

3967namespace {

/// Given an ObjC interface, goes through the modules and links to the
/// interface all the categories for it.
class ObjCCategoriesVisitor {
  ASTReader &Reader;
  ObjCInterfaceDecl *Interface;
  llvm::SmallPtrSetImpl<ObjCCategoryDecl *> &Deserialized;
  ObjCCategoryDecl *Tail = nullptr;
  llvm::DenseMap<DeclarationName, ObjCCategoryDecl *> NameCategoryMap;
  serialization::GlobalDeclID InterfaceID;
  unsigned PreviousGeneration;
  
  void add(ObjCCategoryDecl *Cat) {
    // Only process each category once.
    if (!Deserialized.erase(Cat))
      return;
    
    // Check for duplicate categories.
    if (Cat->getDeclName()) {
      ObjCCategoryDecl *&Existing = NameCategoryMap[Cat->getDeclName()];
      if (Existing && 
          Reader.getOwningModuleFile(Existing) 
                                        != Reader.getOwningModuleFile(Cat)) {
        // FIXME: We should not warn for duplicates in diamond:
        //
        //   MT     //
        //  /  \    //
        // ML  MR   //
        //  \  /    //
        //   MB     //
        //
        // If there are duplicates in ML/MR, there will be warning when 
        // creating MB *and* when importing MB. We should not warn when 
        // importing.
        Reader.Diag(Cat->getLocation(), diag::warn_dup_category_def)
          << Interface->getDeclName() << Cat->getDeclName();
        Reader.Diag(Existing->getLocation(), diag::note_previous_definition);
      } else if (!Existing) {
        // Record this category.
        Existing = Cat;
      }
    }
    
    // Add this category to the end of the chain.
    if (Tail)
      ASTDeclReader::setNextObjCCategory(Tail, Cat);
    else
      Interface->setCategoryListRaw(Cat);
    Tail = Cat;
  }
  
public:
  ObjCCategoriesVisitor(ASTReader &Reader,
                        ObjCInterfaceDecl *Interface,
                        llvm::SmallPtrSetImpl<ObjCCategoryDecl *> &Deserialized,
                        serialization::GlobalDeclID InterfaceID,
                        unsigned PreviousGeneration)
      : Reader(Reader), Interface(Interface), Deserialized(Deserialized),
        InterfaceID(InterfaceID), PreviousGeneration(PreviousGeneration) {
    // Populate the name -> category map with the set of known categories.
    for (auto *Cat : Interface->known_categories()) {
      if (Cat->getDeclName())
        NameCategoryMap[Cat->getDeclName()] = Cat;
      
      // Keep track of the tail of the category list.
      Tail = Cat;
    }
  }

  bool operator()(ModuleFile &M) {
    // If we've loaded all of the category information we care about from
    // this module file, we're done.
    if (M.Generation <= PreviousGeneration)
      return true;
    
    // Map global ID of the definition down to the local ID used in this 
    // module file. If there is no such mapping, we'll find nothing here
    // (or in any module it imports).
    DeclID LocalID = Reader.mapGlobalIDToModuleFileGlobalID(M, InterfaceID);
    if (!LocalID)
      return true;

    // Perform a binary search to find the local redeclarations for this
    // declaration (if any).
    const ObjCCategoriesInfo Compare = { LocalID, 0 };
    const ObjCCategoriesInfo *Result
      = std::lower_bound(M.ObjCCategoriesMap,
                         M.ObjCCategoriesMap + M.LocalNumObjCCategoriesInMap, 
                         Compare);
    if (Result == M.ObjCCategoriesMap + M.LocalNumObjCCategoriesInMap ||
        Result->DefinitionID != LocalID) {
      // We didn't find anything. If the class definition is in this module
      // file, then the module files it depends on cannot have any categories,
      // so suppress further lookup.
      return Reader.isDeclIDFromModule(InterfaceID, M);
    }
    
    // We found something. Dig out all of the categories.
    unsigned Offset = Result->Offset;
    unsigned N = M.ObjCCategories[Offset];
    M.ObjCCategories[Offset++] = 0; // Don't try to deserialize again
    for (unsigned I = 0; I != N; ++I)
      add(cast_or_null<ObjCCategoryDecl>(
            Reader.GetLocalDecl(M, M.ObjCCategories[Offset++])));
    return true;
  }
};

4076} // namespace

4078void ASTReader::loadObjCCategories(serialization::GlobalDeclID ID,
                                 ObjCInterfaceDecl *D,
                                 unsigned PreviousGeneration) {
ObjCCategoriesVisitor Visitor(*this, D, CategoriesDeserialized, ID,
                              PreviousGeneration);
ModuleMgr.visit(Visitor);
4084}

4086template<typename DeclT, typename Fn>
4087static void forAllLaterRedecls(DeclT *D, Fn F) {
F(D);

// Check whether we've already merged D into its redeclaration chain.
// MostRecent may or may not be nullptr if D has not been merged. If
// not, walk the merged redecl chain and see if it's there.
auto *MostRecent = D->getMostRecentDecl();
bool Found = false;
for (auto *Redecl = MostRecent; Redecl && !Found;
     Redecl = Redecl->getPreviousDecl())
  Found = (Redecl == D);

// If this declaration is merged, apply the functor to all later decls.
if (Found) {
  for (auto *Redecl = MostRecent; Redecl != D;
       Redecl = Redecl->getPreviousDecl())
    F(Redecl);
}
4105}

4107void ASTDeclReader::UpdateDecl(Decl *D,
 llvm::SmallVectorImpl<serialization::DeclID> &PendingLazySpecializationIDs) {
while (Record.getIdx() < Record.size()) {
6
←
Loop condition is true.  Entering loop body→
  switch ((DeclUpdateKind)Record.readInt()) {
7
←
Control jumps to 'case UPD_CXX_INSTANTIATED_CLASS_DEFINITION:'  at line 4231→
  case UPD_CXX_ADDED_IMPLICIT_MEMBER: {
    auto *RD = cast<CXXRecordDecl>(D);
    // FIXME: If we also have an update record for instantiating the
    // definition of D, we need that to happen before we get here.
    Decl *MD = Record.readDecl();
    assert(MD && "couldn't read decl from update record")(static_cast <bool> (MD && "couldn't read decl from update record"
) ? void (0) : __assert_fail ("MD && \"couldn't read decl from update record\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 4116, __extension__ __PRETTY_FUNCTION__));
    // FIXME: We should call addHiddenDecl instead, to add the member
    // to its DeclContext.
    RD->addedMember(MD);
    break;
  }

  case UPD_CXX_ADDED_TEMPLATE_SPECIALIZATION:
    // It will be added to the template's lazy specialization set.
    PendingLazySpecializationIDs.push_back(ReadDeclID());
    break;

  case UPD_CXX_ADDED_ANONYMOUS_NAMESPACE: {
    auto *Anon = ReadDeclAs<NamespaceDecl>();

    // Each module has its own anonymous namespace, which is disjoint from
    // any other module's anonymous namespaces, so don't attach the anonymous
    // namespace at all.
    if (!Record.isModule()) {
      if (auto *TU = dyn_cast<TranslationUnitDecl>(D))
        TU->setAnonymousNamespace(Anon);
      else
        cast<NamespaceDecl>(D)->setAnonymousNamespace(Anon);
    }
    break;
  }

  case UPD_CXX_ADDED_VAR_DEFINITION: {
    auto *VD = cast<VarDecl>(D);
    VD->NonParmVarDeclBits.IsInline = Record.readInt();
    VD->NonParmVarDeclBits.IsInlineSpecified = Record.readInt();
    uint64_t Val = Record.readInt();
    if (Val && !VD->getInit()) {
      VD->setInit(Record.readExpr());
      if (Val > 1) { // IsInitKnownICE = 1, IsInitNotICE = 2, IsInitICE = 3
        EvaluatedStmt *Eval = VD->ensureEvaluatedStmt();
        Eval->CheckedICE = true;
        Eval->IsICE = Val == 3;
      }
    }
    break;
  }

  case UPD_CXX_POINT_OF_INSTANTIATION: {
    SourceLocation POI = Record.readSourceLocation();
    if (auto *VTSD = dyn_cast<VarTemplateSpecializationDecl>(D)) {
      VTSD->setPointOfInstantiation(POI);
    } else if (auto *VD = dyn_cast<VarDecl>(D)) {
      VD->getMemberSpecializationInfo()->setPointOfInstantiation(POI);
    } else {
      auto *FD = cast<FunctionDecl>(D);
      if (auto *FTSInfo = FD->TemplateOrSpecialization
                  .dyn_cast<FunctionTemplateSpecializationInfo *>())
        FTSInfo->setPointOfInstantiation(POI);
      else
        FD->TemplateOrSpecialization.get<MemberSpecializationInfo *>()
            ->setPointOfInstantiation(POI);
    }
    break;
  }

  case UPD_CXX_INSTANTIATED_DEFAULT_ARGUMENT: {
    auto *Param = cast<ParmVarDecl>(D);

    // We have to read the default argument regardless of whether we use it
    // so that hypothetical further update records aren't messed up.
    // TODO: Add a function to skip over the next expr record.
    auto *DefaultArg = Record.readExpr();

    // Only apply the update if the parameter still has an uninstantiated
    // default argument.
    if (Param->hasUninstantiatedDefaultArg())
      Param->setDefaultArg(DefaultArg);
    break;
  }

  case UPD_CXX_INSTANTIATED_DEFAULT_MEMBER_INITIALIZER: {
    auto *FD = cast<FieldDecl>(D);
    auto *DefaultInit = Record.readExpr();

    // Only apply the update if the field still has an uninstantiated
    // default member initializer.
    if (FD->hasInClassInitializer() && !FD->getInClassInitializer()) {
      if (DefaultInit)
        FD->setInClassInitializer(DefaultInit);
      else
        // Instantiation failed. We can get here if we serialized an AST for
        // an invalid program.
        FD->removeInClassInitializer();
    }
    break;
  }

  case UPD_CXX_ADDED_FUNCTION_DEFINITION: {
    auto *FD = cast<FunctionDecl>(D);
    if (Reader.PendingBodies[FD]) {
      // FIXME: Maybe check for ODR violations.
      // It's safe to stop now because this update record is always last.
      return;
    }

    if (Record.readInt()) {
      // Maintain AST consistency: any later redeclarations of this function
      // are inline if this one is. (We might have merged another declaration
      // into this one.)
      forAllLaterRedecls(FD, [](FunctionDecl *FD) {
        FD->setImplicitlyInline();
      });
    }
    FD->setInnerLocStart(ReadSourceLocation());
    ReadFunctionDefinition(FD);
    assert(Record.getIdx() == Record.size() && "lazy body must be last")(static_cast <bool> (Record.getIdx() == Record.size() &&
 "lazy body must be last") ? void (0) : __assert_fail ("Record.getIdx() == Record.size() && \"lazy body must be last\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 4227, __extension__ __PRETTY_FUNCTION__));
    break;
  }

  case UPD_CXX_INSTANTIATED_CLASS_DEFINITION: {
    auto *RD = cast<CXXRecordDecl>(D);
    auto *OldDD = RD->getCanonicalDecl()->DefinitionData;
    bool HadRealDefinition =
        OldDD && (OldDD->Definition != RD ||
8
←
Assuming 'OldDD' is null→
                  !Reader.PendingFakeDefinitionData.count(OldDD));
    RD->setParamDestroyedInCallee(Record.readInt());
    RD->setArgPassingRestrictions(
        (RecordDecl::ArgPassingKind)Record.readInt());
    ReadCXXRecordDefinition(RD, /*Update*/true);

    // Visible update is handled separately.
    uint64_t LexicalOffset = ReadLocalOffset();
    if (!HadRealDefinition && LexicalOffset) {
9
←
Taking false branch→
      Record.readLexicalDeclContextStorage(LexicalOffset, RD);
      Reader.PendingFakeDefinitionData.erase(OldDD);
    }

    auto TSK = (TemplateSpecializationKind)Record.readInt();
    SourceLocation POI = ReadSourceLocation();
    if (MemberSpecializationInfo *MSInfo =
10
←
Assuming 'MSInfo' is null→
11
←
Taking false branch→
            RD->getMemberSpecializationInfo()) {
      MSInfo->setTemplateSpecializationKind(TSK);
      MSInfo->setPointOfInstantiation(POI);
    } else {
      auto *Spec = cast<ClassTemplateSpecializationDecl>(RD);
      Spec->setTemplateSpecializationKind(TSK);
      Spec->setPointOfInstantiation(POI);

      if (Record.readInt()) {
12
←
Assuming the condition is true→
13
←
Taking true branch→
        auto *PartialSpec =
            ReadDeclAs<ClassTemplatePartialSpecializationDecl>();
        SmallVector<TemplateArgument, 8> TemplArgs;
        Record.readTemplateArgumentList(TemplArgs);
        auto *TemplArgList = TemplateArgumentList::CreateCopy(
            Reader.getContext(), TemplArgs);

        // FIXME: If we already have a partial specialization set,
        // check that it matches.
        if (!Spec->getSpecializedTemplateOrPartial()
14
←
Taking true branch→
                 .is<ClassTemplatePartialSpecializationDecl *>())
          Spec->setInstantiationOf(PartialSpec, TemplArgList);
15
←
Calling 'ClassTemplateSpecializationDecl::setInstantiationOf'→
      }
    }

    RD->setTagKind((TagTypeKind)Record.readInt());
    RD->setLocation(ReadSourceLocation());
    RD->setLocStart(ReadSourceLocation());
    RD->setBraceRange(ReadSourceRange());

    if (Record.readInt()) {
      AttrVec Attrs;
      Record.readAttributes(Attrs);
      // If the declaration already has attributes, we assume that some other
      // AST file already loaded them.
      if (!D->hasAttrs())
        D->setAttrsImpl(Attrs, Reader.getContext());
    }
    break;
  }

  case UPD_CXX_RESOLVED_DTOR_DELETE: {
    // Set the 'operator delete' directly to avoid emitting another update
    // record.
    auto *Del = ReadDeclAs<FunctionDecl>();
    auto *First = cast<CXXDestructorDecl>(D->getCanonicalDecl());
    auto *ThisArg = Record.readExpr();
    // FIXME: Check consistency if we have an old and new operator delete.
    if (!First->OperatorDelete) {
      First->OperatorDelete = Del;
      First->OperatorDeleteThisArg = ThisArg;
    }
    break;
  }

  case UPD_CXX_RESOLVED_EXCEPTION_SPEC: {
    FunctionProtoType::ExceptionSpecInfo ESI;
    SmallVector<QualType, 8> ExceptionStorage;
    Record.readExceptionSpec(ExceptionStorage, ESI);

    // Update this declaration's exception specification, if needed.
    auto *FD = cast<FunctionDecl>(D);
    auto *FPT = FD->getType()->castAs<FunctionProtoType>();
    // FIXME: If the exception specification is already present, check that it
    // matches.
    if (isUnresolvedExceptionSpec(FPT->getExceptionSpecType())) {
      FD->setType(Reader.getContext().getFunctionType(
          FPT->getReturnType(), FPT->getParamTypes(),
          FPT->getExtProtoInfo().withExceptionSpec(ESI)));

      // When we get to the end of deserializing, see if there are other decls
      // that we need to propagate this exception specification onto.
      Reader.PendingExceptionSpecUpdates.insert(
          std::make_pair(FD->getCanonicalDecl(), FD));
    }
    break;
  }

  case UPD_CXX_DEDUCED_RETURN_TYPE: {
    // FIXME: Also do this when merging redecls.
    QualType DeducedResultType = Record.readType();
    for (auto *Redecl : merged_redecls(D)) {
      // FIXME: If the return type is already deduced, check that it matches.
      auto *FD = cast<FunctionDecl>(Redecl);
      Reader.getContext().adjustDeducedFunctionResultType(FD,
                                                          DeducedResultType);
    }
    break;
  }

  case UPD_DECL_MARKED_USED:
    // Maintain AST consistency: any later redeclarations are used too.
    D->markUsed(Reader.getContext());
    break;

  case UPD_MANGLING_NUMBER:
    Reader.getContext().setManglingNumber(cast<NamedDecl>(D),
                                          Record.readInt());
    break;

  case UPD_STATIC_LOCAL_NUMBER:
    Reader.getContext().setStaticLocalNumber(cast<VarDecl>(D),
                                             Record.readInt());
    break;

  case UPD_DECL_MARKED_OPENMP_THREADPRIVATE:
    D->addAttr(OMPThreadPrivateDeclAttr::CreateImplicit(Reader.getContext(),
                                                        ReadSourceRange()));
    break;

  case UPD_DECL_EXPORTED: {
    unsigned SubmoduleID = readSubmoduleID();
    auto *Exported = cast<NamedDecl>(D);
    if (auto *TD = dyn_cast<TagDecl>(Exported))
      Exported = TD->getDefinition();
    Module *Owner = SubmoduleID ? Reader.getSubmodule(SubmoduleID) : nullptr;
    if (Reader.getContext().getLangOpts().ModulesLocalVisibility) {
      Reader.getContext().mergeDefinitionIntoModule(cast<NamedDecl>(Exported),
                                                    Owner);
      Reader.PendingMergedDefinitionsToDeduplicate.insert(
          cast<NamedDecl>(Exported));
    } else if (Owner && Owner->NameVisibility != Module::AllVisible) {
      // If Owner is made visible at some later point, make this declaration
      // visible too.
      Reader.HiddenNamesMap[Owner].push_back(Exported);
    } else {
      // The declaration is now visible.
      Exported->setVisibleDespiteOwningModule();
    }
    break;
  }

  case UPD_DECL_MARKED_OPENMP_DECLARETARGET:
  case UPD_ADDED_ATTR_TO_RECORD:
    AttrVec Attrs;
    Record.readAttributes(Attrs);
    assert(Attrs.size() == 1)(static_cast <bool> (Attrs.size() == 1) ? void (0) : __assert_fail
 ("Attrs.size() == 1", "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/lib/Serialization/ASTReaderDecl.cpp"
, 4387, __extension__ __PRETTY_FUNCTION__));
    D->addAttr(Attrs[0]);
    break;
  }
}
4392}

←

/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h

1//===- DeclTemplate.h - Classes for representing C++ templates --*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10/// \file
11/// Defines the C++ template declaration subclasses.
12//
13//===----------------------------------------------------------------------===//

15#ifndef LLVM_CLANG_AST_DECLTEMPLATE_H
16#define LLVM_CLANG_AST_DECLTEMPLATE_H

18#include "clang/AST/Decl.h"
19#include "clang/AST/DeclBase.h"
20#include "clang/AST/DeclCXX.h"
21#include "clang/AST/DeclarationName.h"
22#include "clang/AST/Redeclarable.h"
23#include "clang/AST/TemplateBase.h"
24#include "clang/AST/Type.h"
25#include "clang/Basic/LLVM.h"
26#include "clang/Basic/SourceLocation.h"
27#include "clang/Basic/Specifiers.h"
28#include "llvm/ADT/ArrayRef.h"
29#include "llvm/ADT/FoldingSet.h"
30#include "llvm/ADT/PointerIntPair.h"
31#include "llvm/ADT/PointerUnion.h"
32#include "llvm/ADT/iterator.h"
33#include "llvm/ADT/iterator_range.h"
34#include "llvm/Support/Casting.h"
35#include "llvm/Support/Compiler.h"
36#include "llvm/Support/TrailingObjects.h"
37#include <cassert>
38#include <cstddef>
39#include <cstdint>
40#include <iterator>
41#include <utility>

43namespace clang {

45enum BuiltinTemplateKind : int;
46class ClassTemplateDecl;
47class ClassTemplatePartialSpecializationDecl;
48class Expr;
49class FunctionTemplateDecl;
50class IdentifierInfo;
51class NonTypeTemplateParmDecl;
52class TemplateDecl;
53class TemplateTemplateParmDecl;
54class TemplateTypeParmDecl;
55class UnresolvedSetImpl;
56class VarTemplateDecl;
57class VarTemplatePartialSpecializationDecl;

59/// Stores a template parameter of any kind.
60using TemplateParameter =
  llvm::PointerUnion3<TemplateTypeParmDecl *, NonTypeTemplateParmDecl *,
                      TemplateTemplateParmDecl *>;

64NamedDecl *getAsNamedDecl(TemplateParameter P);

66/// Stores a list of template parameters for a TemplateDecl and its
67/// derived classes.
68class TemplateParameterList final
  : private llvm::TrailingObjects<TemplateParameterList, NamedDecl *,
                                  Expr *> {
/// The location of the 'template' keyword.
SourceLocation TemplateLoc;

/// The locations of the '<' and '>' angle brackets.
SourceLocation LAngleLoc, RAngleLoc;

/// The number of template parameters in this template
/// parameter list.
unsigned NumParams : 30;

/// Whether this template parameter list contains an unexpanded parameter
/// pack.
unsigned ContainsUnexpandedParameterPack : 1;

/// Whether this template parameter list has an associated requires-clause
unsigned HasRequiresClause : 1;

88protected:
TemplateParameterList(SourceLocation TemplateLoc, SourceLocation LAngleLoc,
                      ArrayRef<NamedDecl *> Params, SourceLocation RAngleLoc,
                      Expr *RequiresClause);

size_t numTrailingObjects(OverloadToken<NamedDecl *>) const {
  return NumParams;
}

size_t numTrailingObjects(OverloadToken<Expr *>) const {
  return HasRequiresClause;
}

101public:
template <size_t N, bool HasRequiresClause>
friend class FixedSizeTemplateParameterListStorage;
friend TrailingObjects;

static TemplateParameterList *Create(const ASTContext &C,
                                     SourceLocation TemplateLoc,
                                     SourceLocation LAngleLoc,
                                     ArrayRef<NamedDecl *> Params,
                                     SourceLocation RAngleLoc,
                                     Expr *RequiresClause);

/// Iterates through the template parameters in this list.
using iterator = NamedDecl **;

/// Iterates through the template parameters in this list.
using const_iterator = NamedDecl * const *;

iterator begin() { return getTrailingObjects<NamedDecl *>(); }
const_iterator begin() const { return getTrailingObjects<NamedDecl *>(); }
iterator end() { return begin() + NumParams; }
const_iterator end() const { return begin() + NumParams; }

unsigned size() const { return NumParams; }

ArrayRef<NamedDecl*> asArray() {
  return llvm::makeArrayRef(begin(), end());
}
ArrayRef<const NamedDecl*> asArray() const {
  return llvm::makeArrayRef(begin(), size());
}

NamedDecl* getParam(unsigned Idx) {
  assert(Idx < size() && "Template parameter index out-of-range")(static_cast <bool> (Idx < size() && "Template parameter index out-of-range"
) ? void (0) : __assert_fail ("Idx < size() && \"Template parameter index out-of-range\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 134, __extension__ __PRETTY_FUNCTION__));
  return begin()[Idx];
}
const NamedDecl* getParam(unsigned Idx) const {
  assert(Idx < size() && "Template parameter index out-of-range")(static_cast <bool> (Idx < size() && "Template parameter index out-of-range"
) ? void (0) : __assert_fail ("Idx < size() && \"Template parameter index out-of-range\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 138, __extension__ __PRETTY_FUNCTION__));
  return begin()[Idx];
}

/// Returns the minimum number of arguments needed to form a
/// template specialization.
///
/// This may be fewer than the number of template parameters, if some of
/// the parameters have default arguments or if there is a parameter pack.
unsigned getMinRequiredArguments() const;

/// Get the depth of this template parameter list in the set of
/// template parameter lists.
///
/// The first template parameter list in a declaration will have depth 0,
/// the second template parameter list will have depth 1, etc.
unsigned getDepth() const;

/// Determine whether this template parameter list contains an
/// unexpanded parameter pack.
bool containsUnexpandedParameterPack() const {
  return ContainsUnexpandedParameterPack;
}

/// The constraint-expression of the associated requires-clause.
Expr *getRequiresClause() {
  return HasRequiresClause ? *getTrailingObjects<Expr *>() : nullptr;
}

/// The constraint-expression of the associated requires-clause.
const Expr *getRequiresClause() const {
  return HasRequiresClause ? *getTrailingObjects<Expr *>() : nullptr;
}

SourceLocation getTemplateLoc() const { return TemplateLoc; }
SourceLocation getLAngleLoc() const { return LAngleLoc; }
SourceLocation getRAngleLoc() const { return RAngleLoc; }

SourceRange getSourceRange() const LLVM_READONLY__attribute__((__pure__)) {
  return SourceRange(TemplateLoc, RAngleLoc);
}

180public:
// FIXME: workaround for MSVC 2013; remove when no longer needed
using FixedSizeStorageOwner = TrailingObjects::FixedSizeStorageOwner;
183};

185/// Stores a list of template parameters and the associated
186/// requires-clause (if any) for a TemplateDecl and its derived classes.
187/// Suitable for creating on the stack.
188template <size_t N, bool HasRequiresClause>
189class FixedSizeTemplateParameterListStorage
  : public TemplateParameterList::FixedSizeStorageOwner {
typename TemplateParameterList::FixedSizeStorage<
    NamedDecl *, Expr *>::with_counts<
    N, HasRequiresClause ? 1u : 0u
    >::type storage;

196public:
FixedSizeTemplateParameterListStorage(SourceLocation TemplateLoc,
                                      SourceLocation LAngleLoc,
                                      ArrayRef<NamedDecl *> Params,
                                      SourceLocation RAngleLoc,
                                      Expr *RequiresClause)
    : FixedSizeStorageOwner(
          (assert(N == Params.size())(static_cast <bool> (N == Params.size()) ? void (0) : __assert_fail
 ("N == Params.size()", "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 203, __extension__ __PRETTY_FUNCTION__)),
           assert(HasRequiresClause == static_cast<bool>(RequiresClause))(static_cast <bool> (HasRequiresClause == static_cast<
bool>(RequiresClause)) ? void (0) : __assert_fail ("HasRequiresClause == static_cast<bool>(RequiresClause)"
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 204, __extension__ __PRETTY_FUNCTION__)),
           new (static_cast<void *>(&storage)) TemplateParameterList(
               TemplateLoc, LAngleLoc, Params, RAngleLoc, RequiresClause))) {}
207};

209/// A template argument list.
210class TemplateArgumentList final
  : private llvm::TrailingObjects<TemplateArgumentList, TemplateArgument> {
/// The template argument list.
const TemplateArgument *Arguments;

/// The number of template arguments in this template
/// argument list.
unsigned NumArguments;

// Constructs an instance with an internal Argument list, containing
// a copy of the Args array. (Called by CreateCopy)
TemplateArgumentList(ArrayRef<TemplateArgument> Args);

223public:
friend TrailingObjects;

TemplateArgumentList(const TemplateArgumentList &) = delete;
TemplateArgumentList &operator=(const TemplateArgumentList &) = delete;

/// Type used to indicate that the template argument list itself is a
/// stack object. It does not own its template arguments.
enum OnStackType { OnStack };

/// Create a new template argument list that copies the given set of
/// template arguments.
static TemplateArgumentList *CreateCopy(ASTContext &Context,
                                        ArrayRef<TemplateArgument> Args);

/// Construct a new, temporary template argument list on the stack.
///
/// The template argument list does not own the template arguments
/// provided.
explicit TemplateArgumentList(OnStackType, ArrayRef<TemplateArgument> Args)
    : Arguments(Args.data()), NumArguments(Args.size()) {}

/// Produces a shallow copy of the given template argument list.
///
/// This operation assumes that the input argument list outlives it.
/// This takes the list as a pointer to avoid looking like a copy
/// constructor, since this really really isn't safe to use that
/// way.
explicit TemplateArgumentList(const TemplateArgumentList *Other)
    : Arguments(Other->data()), NumArguments(Other->size()) {}

/// Retrieve the template argument at a given index.
const TemplateArgument &get(unsigned Idx) const {
  assert(Idx < NumArguments && "Invalid template argument index")(static_cast <bool> (Idx < NumArguments && "Invalid template argument index"
) ? void (0) : __assert_fail ("Idx < NumArguments && \"Invalid template argument index\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 256, __extension__ __PRETTY_FUNCTION__));
  return data()[Idx];
}

/// Retrieve the template argument at a given index.
const TemplateArgument &operator[](unsigned Idx) const { return get(Idx); }

/// Produce this as an array ref.
ArrayRef<TemplateArgument> asArray() const {
  return llvm::makeArrayRef(data(), size());
}

/// Retrieve the number of template arguments in this
/// template argument list.
unsigned size() const { return NumArguments; }

/// Retrieve a pointer to the template argument list.
const TemplateArgument *data() const { return Arguments; }
274};

276void *allocateDefaultArgStorageChain(const ASTContext &C);

278/// Storage for a default argument. This is conceptually either empty, or an
279/// argument value, or a pointer to a previous declaration that had a default
280/// argument.
281///
282/// However, this is complicated by modules: while we require all the default
283/// arguments for a template to be equivalent, there may be more than one, and
284/// we need to track all the originating parameters to determine if the default
285/// argument is visible.
286template<typename ParmDecl, typename ArgType>
287class DefaultArgStorage {
/// Storage for both the value *and* another parameter from which we inherit
/// the default argument. This is used when multiple default arguments for a
/// parameter are merged together from different modules.
struct Chain {
  ParmDecl *PrevDeclWithDefaultArg;
  ArgType Value;
};
static_assert(sizeof(Chain) == sizeof(void *) * 2,
              "non-pointer argument type?");

llvm::PointerUnion3<ArgType, ParmDecl*, Chain*> ValueOrInherited;

static ParmDecl *getParmOwningDefaultArg(ParmDecl *Parm) {
  const DefaultArgStorage &Storage = Parm->getDefaultArgStorage();
  if (auto *Prev = Storage.ValueOrInherited.template dyn_cast<ParmDecl *>())
    Parm = Prev;
  assert(!Parm->getDefaultArgStorage()(static_cast <bool> (!Parm->getDefaultArgStorage() .
ValueOrInherited.template is<ParmDecl *>() && "should only be one level of indirection"
) ? void (0) : __assert_fail ("!Parm->getDefaultArgStorage() .ValueOrInherited.template is<ParmDecl *>() && \"should only be one level of indirection\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 306, __extension__ __PRETTY_FUNCTION__))
              .ValueOrInherited.template is<ParmDecl *>() &&(static_cast <bool> (!Parm->getDefaultArgStorage() .
ValueOrInherited.template is<ParmDecl *>() && "should only be one level of indirection"
) ? void (0) : __assert_fail ("!Parm->getDefaultArgStorage() .ValueOrInherited.template is<ParmDecl *>() && \"should only be one level of indirection\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 306, __extension__ __PRETTY_FUNCTION__))
         "should only be one level of indirection")(static_cast <bool> (!Parm->getDefaultArgStorage() .
ValueOrInherited.template is<ParmDecl *>() && "should only be one level of indirection"
) ? void (0) : __assert_fail ("!Parm->getDefaultArgStorage() .ValueOrInherited.template is<ParmDecl *>() && \"should only be one level of indirection\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 306, __extension__ __PRETTY_FUNCTION__));
  return Parm;
}

310public:
DefaultArgStorage() : ValueOrInherited(ArgType()) {}

/// Determine whether there is a default argument for this parameter.
bool isSet() const { return !ValueOrInherited.isNull(); }

/// Determine whether the default argument for this parameter was inherited
/// from a previous declaration of the same entity.
bool isInherited() const { return ValueOrInherited.template is<ParmDecl*>(); }

/// Get the default argument's value. This does not consider whether the
/// default argument is visible.
ArgType get() const {
  const DefaultArgStorage *Storage = this;
  if (const auto *Prev = ValueOrInherited.template dyn_cast<ParmDecl *>())
    Storage = &Prev->getDefaultArgStorage();
  if (const auto *C = Storage->ValueOrInherited.template dyn_cast<Chain *>())
    return C->Value;
  return Storage->ValueOrInherited.template get<ArgType>();
}

/// Get the parameter from which we inherit the default argument, if any.
/// This is the parameter on which the default argument was actually written.
const ParmDecl *getInheritedFrom() const {
  if (const auto *D = ValueOrInherited.template dyn_cast<ParmDecl *>())
    return D;
  if (const auto *C = ValueOrInherited.template dyn_cast<Chain *>())
    return C->PrevDeclWithDefaultArg;
  return nullptr;
}

/// Set the default argument.
void set(ArgType Arg) {
  assert(!isSet() && "default argument already set")(static_cast <bool> (!isSet() && "default argument already set"
) ? void (0) : __assert_fail ("!isSet() && \"default argument already set\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 343, __extension__ __PRETTY_FUNCTION__));
  ValueOrInherited = Arg;
}

/// Set that the default argument was inherited from another parameter.
void setInherited(const ASTContext &C, ParmDecl *InheritedFrom) {
  assert(!isInherited() && "default argument already inherited")(static_cast <bool> (!isInherited() && "default argument already inherited"
) ? void (0) : __assert_fail ("!isInherited() && \"default argument already inherited\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 349, __extension__ __PRETTY_FUNCTION__));
  InheritedFrom = getParmOwningDefaultArg(InheritedFrom);
  if (!isSet())
    ValueOrInherited = InheritedFrom;
  else
    ValueOrInherited = new (allocateDefaultArgStorageChain(C))
        Chain{InheritedFrom, ValueOrInherited.template get<ArgType>()};
}

/// Remove the default argument, even if it was inherited.
void clear() {
  ValueOrInherited = ArgType();
}
362};

364//===----------------------------------------------------------------------===//
365// Kinds of Templates
366//===----------------------------------------------------------------------===//

368/// Stores the template parameter list and associated constraints for
369/// \c TemplateDecl objects that track associated constraints.
370class ConstrainedTemplateDeclInfo {
friend TemplateDecl;

373public:
ConstrainedTemplateDeclInfo() = default;

TemplateParameterList *getTemplateParameters() const {
  return TemplateParams;
}

Expr *getAssociatedConstraints() const { return AssociatedConstraints; }

382protected:
void setTemplateParameters(TemplateParameterList *TParams) {
  TemplateParams = TParams;
}

void setAssociatedConstraints(Expr *AC) { AssociatedConstraints = AC; }

TemplateParameterList *TemplateParams = nullptr;
Expr *AssociatedConstraints = nullptr;
391};


394/// The base class of all kinds of template declarations (e.g.,
395/// class, function, etc.).
396///
397/// The TemplateDecl class stores the list of template parameters and a
398/// reference to the templated scoped declaration: the underlying AST node.
399class TemplateDecl : public NamedDecl {
void anchor() override;

402protected:
// Construct a template decl with the given name and parameters.
// Used when there is no templated element (e.g., for tt-params).
TemplateDecl(ConstrainedTemplateDeclInfo *CTDI, Kind DK, DeclContext *DC,
             SourceLocation L, DeclarationName Name,
             TemplateParameterList *Params)
    : NamedDecl(DK, DC, L, Name), TemplatedDecl(nullptr),
      TemplateParams(CTDI) {
  this->setTemplateParameters(Params);
}

TemplateDecl(Kind DK, DeclContext *DC, SourceLocation L, DeclarationName Name,
             TemplateParameterList *Params)
    : TemplateDecl(nullptr, DK, DC, L, Name, Params) {}

// Construct a template decl with name, parameters, and templated element.
TemplateDecl(ConstrainedTemplateDeclInfo *CTDI, Kind DK, DeclContext *DC,
             SourceLocation L, DeclarationName Name,
             TemplateParameterList *Params, NamedDecl *Decl)
    : NamedDecl(DK, DC, L, Name), TemplatedDecl(Decl),
      TemplateParams(CTDI) {
  this->setTemplateParameters(Params);
}

TemplateDecl(Kind DK, DeclContext *DC, SourceLocation L, DeclarationName Name,
             TemplateParameterList *Params, NamedDecl *Decl)
    : TemplateDecl(nullptr, DK, DC, L, Name, Params, Decl) {}

430public:
/// Get the list of template parameters
TemplateParameterList *getTemplateParameters() const {
  const auto *const CTDI =
      TemplateParams.dyn_cast<ConstrainedTemplateDeclInfo *>();
  return CTDI ? CTDI->getTemplateParameters()
              : TemplateParams.get<TemplateParameterList *>();
}

/// Get the constraint-expression from the associated requires-clause (if any)
const Expr *getRequiresClause() const {
  const TemplateParameterList *const TP = getTemplateParameters();
  return TP ? TP->getRequiresClause() : nullptr;
}

Expr *getAssociatedConstraints() const {
  const auto *const C = cast<TemplateDecl>(getCanonicalDecl());
  const auto *const CTDI =
      C->TemplateParams.dyn_cast<ConstrainedTemplateDeclInfo *>();
  return CTDI ? CTDI->getAssociatedConstraints() : nullptr;
}

/// Get the underlying, templated declaration.
NamedDecl *getTemplatedDecl() const { return TemplatedDecl; }

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }

static bool classofKind(Kind K) {
  return K >= firstTemplate && K <= lastTemplate;
}

SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) {
  return SourceRange(getTemplateParameters()->getTemplateLoc(),
                     TemplatedDecl->getSourceRange().getEnd());
}

467protected:
NamedDecl *TemplatedDecl;

/// The template parameter list and optional requires-clause
/// associated with this declaration; alternatively, a
/// \c ConstrainedTemplateDeclInfo if the associated constraints of the
/// template are being tracked by this particular declaration.
llvm::PointerUnion<TemplateParameterList *,
                   ConstrainedTemplateDeclInfo *>
    TemplateParams;

void setTemplateParameters(TemplateParameterList *TParams) {
  if (auto *const CTDI =
          TemplateParams.dyn_cast<ConstrainedTemplateDeclInfo *>()) {
    CTDI->setTemplateParameters(TParams);
  } else {
    TemplateParams = TParams;
  }
}

void setAssociatedConstraints(Expr *AC) {
  assert(isCanonicalDecl() &&(static_cast <bool> (isCanonicalDecl() && "Attaching associated constraints to non-canonical Decl"
) ? void (0) : __assert_fail ("isCanonicalDecl() && \"Attaching associated constraints to non-canonical Decl\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 489, __extension__ __PRETTY_FUNCTION__))
         "Attaching associated constraints to non-canonical Decl")(static_cast <bool> (isCanonicalDecl() && "Attaching associated constraints to non-canonical Decl"
) ? void (0) : __assert_fail ("isCanonicalDecl() && \"Attaching associated constraints to non-canonical Decl\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 489, __extension__ __PRETTY_FUNCTION__));
  TemplateParams.get<ConstrainedTemplateDeclInfo *>()
      ->setAssociatedConstraints(AC);
}

494public:
/// Initialize the underlying templated declaration and
/// template parameters.
void init(NamedDecl *templatedDecl, TemplateParameterList* templateParams) {
  assert(!TemplatedDecl && "TemplatedDecl already set!")(static_cast <bool> (!TemplatedDecl && "TemplatedDecl already set!"
) ? void (0) : __assert_fail ("!TemplatedDecl && \"TemplatedDecl already set!\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 498, __extension__ __PRETTY_FUNCTION__));
  assert(!TemplateParams && "TemplateParams already set!")(static_cast <bool> (!TemplateParams && "TemplateParams already set!"
) ? void (0) : __assert_fail ("!TemplateParams && \"TemplateParams already set!\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 499, __extension__ __PRETTY_FUNCTION__));
  TemplatedDecl = templatedDecl;
  TemplateParams = templateParams;
}
503};

505/// Provides information about a function template specialization,
506/// which is a FunctionDecl that has been explicitly specialization or
507/// instantiated from a function template.
508class FunctionTemplateSpecializationInfo : public llvm::FoldingSetNode {
FunctionTemplateSpecializationInfo(FunctionDecl *FD,
                                   FunctionTemplateDecl *Template,
                                   TemplateSpecializationKind TSK,
                                   const TemplateArgumentList *TemplateArgs,
                     const ASTTemplateArgumentListInfo *TemplateArgsAsWritten,
                                   SourceLocation POI)
    : Function(FD), Template(Template, TSK - 1),
      TemplateArguments(TemplateArgs),
      TemplateArgumentsAsWritten(TemplateArgsAsWritten),
      PointOfInstantiation(POI) {}

520public:
static FunctionTemplateSpecializationInfo *
Create(ASTContext &C, FunctionDecl *FD, FunctionTemplateDecl *Template,
       TemplateSpecializationKind TSK,
       const TemplateArgumentList *TemplateArgs,
       const TemplateArgumentListInfo *TemplateArgsAsWritten,
       SourceLocation POI);

/// The function template specialization that this structure
/// describes.
FunctionDecl *Function;

/// The function template from which this function template
/// specialization was generated.
///
/// The two bits contain the top 4 values of TemplateSpecializationKind.
llvm::PointerIntPair<FunctionTemplateDecl *, 2> Template;

/// The template arguments used to produce the function template
/// specialization from the function template.
const TemplateArgumentList *TemplateArguments;

/// The template arguments as written in the sources, if provided.
const ASTTemplateArgumentListInfo *TemplateArgumentsAsWritten;

/// The point at which this function template specialization was
/// first instantiated.
SourceLocation PointOfInstantiation;

/// Retrieve the template from which this function was specialized.
FunctionTemplateDecl *getTemplate() const { return Template.getPointer(); }

/// Determine what kind of template specialization this is.
TemplateSpecializationKind getTemplateSpecializationKind() const {
  return (TemplateSpecializationKind)(Template.getInt() + 1);
}

bool isExplicitSpecialization() const {
  return getTemplateSpecializationKind() == TSK_ExplicitSpecialization;
}

/// True if this declaration is an explicit specialization,
/// explicit instantiation declaration, or explicit instantiation
/// definition.
bool isExplicitInstantiationOrSpecialization() const {
  return isTemplateExplicitInstantiationOrSpecialization(
      getTemplateSpecializationKind());
}

/// Set the template specialization kind.
void setTemplateSpecializationKind(TemplateSpecializationKind TSK) {
  assert(TSK != TSK_Undeclared &&(static_cast <bool> (TSK != TSK_Undeclared && "Cannot encode TSK_Undeclared for a function template specialization"
) ? void (0) : __assert_fail ("TSK != TSK_Undeclared && \"Cannot encode TSK_Undeclared for a function template specialization\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 572, __extension__ __PRETTY_FUNCTION__))
       "Cannot encode TSK_Undeclared for a function template specialization")(static_cast <bool> (TSK != TSK_Undeclared && "Cannot encode TSK_Undeclared for a function template specialization"
) ? void (0) : __assert_fail ("TSK != TSK_Undeclared && \"Cannot encode TSK_Undeclared for a function template specialization\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 572, __extension__ __PRETTY_FUNCTION__));
  Template.setInt(TSK - 1);
}

/// Retrieve the first point of instantiation of this function
/// template specialization.
///
/// The point of instantiation may be an invalid source location if this
/// function has yet to be instantiated.
SourceLocation getPointOfInstantiation() const {
  return PointOfInstantiation;
}

/// Set the (first) point of instantiation of this function template
/// specialization.
void setPointOfInstantiation(SourceLocation POI) {
  PointOfInstantiation = POI;
}

void Profile(llvm::FoldingSetNodeID &ID) {
  Profile(ID, TemplateArguments->asArray(),
          Function->getASTContext());
}

static void
Profile(llvm::FoldingSetNodeID &ID, ArrayRef<TemplateArgument> TemplateArgs,
        ASTContext &Context) {
  ID.AddInteger(TemplateArgs.size());
  for (const TemplateArgument &TemplateArg : TemplateArgs)
    TemplateArg.Profile(ID, Context);
}
603};

605/// Provides information a specialization of a member of a class
606/// template, which may be a member function, static data member,
607/// member class or member enumeration.
608class MemberSpecializationInfo {
// The member declaration from which this member was instantiated, and the
// manner in which the instantiation occurred (in the lower two bits).
llvm::PointerIntPair<NamedDecl *, 2> MemberAndTSK;

// The point at which this member was first instantiated.
SourceLocation PointOfInstantiation;

616public:
explicit
MemberSpecializationInfo(NamedDecl *IF, TemplateSpecializationKind TSK,
                         SourceLocation POI = SourceLocation())
    : MemberAndTSK(IF, TSK - 1), PointOfInstantiation(POI) {
  assert(TSK != TSK_Undeclared &&(static_cast <bool> (TSK != TSK_Undeclared && "Cannot encode undeclared template specializations for members"
) ? void (0) : __assert_fail ("TSK != TSK_Undeclared && \"Cannot encode undeclared template specializations for members\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 622, __extension__ __PRETTY_FUNCTION__))
         "Cannot encode undeclared template specializations for members")(static_cast <bool> (TSK != TSK_Undeclared && "Cannot encode undeclared template specializations for members"
) ? void (0) : __assert_fail ("TSK != TSK_Undeclared && \"Cannot encode undeclared template specializations for members\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 622, __extension__ __PRETTY_FUNCTION__));
}

/// Retrieve the member declaration from which this member was
/// instantiated.
NamedDecl *getInstantiatedFrom() const { return MemberAndTSK.getPointer(); }

/// Determine what kind of template specialization this is.
TemplateSpecializationKind getTemplateSpecializationKind() const {
  return (TemplateSpecializationKind)(MemberAndTSK.getInt() + 1);
}

bool isExplicitSpecialization() const {
  return getTemplateSpecializationKind() == TSK_ExplicitSpecialization;
}

/// Set the template specialization kind.
void setTemplateSpecializationKind(TemplateSpecializationKind TSK) {
  assert(TSK != TSK_Undeclared &&(static_cast <bool> (TSK != TSK_Undeclared && "Cannot encode undeclared template specializations for members"
) ? void (0) : __assert_fail ("TSK != TSK_Undeclared && \"Cannot encode undeclared template specializations for members\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 641, __extension__ __PRETTY_FUNCTION__))
         "Cannot encode undeclared template specializations for members")(static_cast <bool> (TSK != TSK_Undeclared && "Cannot encode undeclared template specializations for members"
) ? void (0) : __assert_fail ("TSK != TSK_Undeclared && \"Cannot encode undeclared template specializations for members\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 641, __extension__ __PRETTY_FUNCTION__));
  MemberAndTSK.setInt(TSK - 1);
}

/// Retrieve the first point of instantiation of this member.
/// If the point of instantiation is an invalid location, then this member
/// has not yet been instantiated.
SourceLocation getPointOfInstantiation() const {
  return PointOfInstantiation;
}

/// Set the first point of instantiation.
void setPointOfInstantiation(SourceLocation POI) {
  PointOfInstantiation = POI;
}
656};

658/// Provides information about a dependent function-template
659/// specialization declaration.
660///
661/// Since explicit function template specialization and instantiation
662/// declarations can only appear in namespace scope, and you can only
663/// specialize a member of a fully-specialized class, the only way to
664/// get one of these is in a friend declaration like the following:
665///
666/// \code
667///   template \<class T> void foo(T);
668///   template \<class T> class A {
669///     friend void foo<>(T);
670///   };
671/// \endcode
672class DependentFunctionTemplateSpecializationInfo final
  : private llvm::TrailingObjects<DependentFunctionTemplateSpecializationInfo,
                                  TemplateArgumentLoc,
                                  FunctionTemplateDecl *> {
/// The number of potential template candidates.
unsigned NumTemplates;

/// The number of template arguments.
unsigned NumArgs;

/// The locations of the left and right angle brackets.
SourceRange AngleLocs;

size_t numTrailingObjects(OverloadToken<TemplateArgumentLoc>) const {
  return NumArgs;
}
size_t numTrailingObjects(OverloadToken<FunctionTemplateDecl *>) const {
  return NumTemplates;
}

DependentFunctionTemplateSpecializationInfo(
                               const UnresolvedSetImpl &Templates,
                               const TemplateArgumentListInfo &TemplateArgs);

696public:
friend TrailingObjects;

static DependentFunctionTemplateSpecializationInfo *
Create(ASTContext &Context, const UnresolvedSetImpl &Templates,
       const TemplateArgumentListInfo &TemplateArgs);

/// Returns the number of function templates that this might
/// be a specialization of.
unsigned getNumTemplates() const { return NumTemplates; }

/// Returns the i'th template candidate.
FunctionTemplateDecl *getTemplate(unsigned I) const {
  assert(I < getNumTemplates() && "template index out of range")(static_cast <bool> (I < getNumTemplates() &&
 "template index out of range") ? void (0) : __assert_fail ("I < getNumTemplates() && \"template index out of range\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 709, __extension__ __PRETTY_FUNCTION__));
  return getTrailingObjects<FunctionTemplateDecl *>()[I];
}

/// Returns the explicit template arguments that were given.
const TemplateArgumentLoc *getTemplateArgs() const {
  return getTrailingObjects<TemplateArgumentLoc>();
}

/// Returns the number of explicit template arguments that were given.
unsigned getNumTemplateArgs() const { return NumArgs; }

/// Returns the nth template argument.
const TemplateArgumentLoc &getTemplateArg(unsigned I) const {
  assert(I < getNumTemplateArgs() && "template arg index out of range")(static_cast <bool> (I < getNumTemplateArgs() &&
 "template arg index out of range") ? void (0) : __assert_fail
 ("I < getNumTemplateArgs() && \"template arg index out of range\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 723, __extension__ __PRETTY_FUNCTION__));
  return getTemplateArgs()[I];
}

SourceLocation getLAngleLoc() const {
  return AngleLocs.getBegin();
}

SourceLocation getRAngleLoc() const {
  return AngleLocs.getEnd();
}
734};

736/// Declaration of a redeclarable template.
737class RedeclarableTemplateDecl : public TemplateDecl, 
                               public Redeclarable<RedeclarableTemplateDecl> 
739{
using redeclarable_base = Redeclarable<RedeclarableTemplateDecl>;

RedeclarableTemplateDecl *getNextRedeclarationImpl() override {
  return getNextRedeclaration();
}

RedeclarableTemplateDecl *getPreviousDeclImpl() override {
  return getPreviousDecl();
}

RedeclarableTemplateDecl *getMostRecentDeclImpl() override {
  return getMostRecentDecl();
}

754protected:
template <typename EntryType> struct SpecEntryTraits {
  using DeclType = EntryType;

  static DeclType *getDecl(EntryType *D) {
    return D;
  }

  static ArrayRef<TemplateArgument> getTemplateArgs(EntryType *D) {
    return D->getTemplateArgs().asArray();
  }
};

template <typename EntryType, typename SETraits = SpecEntryTraits<EntryType>,
          typename DeclType = typename SETraits::DeclType>
struct SpecIterator
    : llvm::iterator_adaptor_base<
          SpecIterator<EntryType, SETraits, DeclType>,
          typename llvm::FoldingSetVector<EntryType>::iterator,
          typename std::iterator_traits<typename llvm::FoldingSetVector<
              EntryType>::iterator>::iterator_category,
          DeclType *, ptrdiff_t, DeclType *, DeclType *> {
  SpecIterator() = default;
  explicit SpecIterator(
      typename llvm::FoldingSetVector<EntryType>::iterator SetIter)
      : SpecIterator::iterator_adaptor_base(std::move(SetIter)) {}

  DeclType *operator*() const {
    return SETraits::getDecl(&*this->I)->getMostRecentDecl();
  }

  DeclType *operator->() const { return **this; }
};

template <typename EntryType>
static SpecIterator<EntryType>
makeSpecIterator(llvm::FoldingSetVector<EntryType> &Specs, bool isEnd) {
  return SpecIterator<EntryType>(isEnd ? Specs.end() : Specs.begin());
}

void loadLazySpecializationsImpl() const;

template <class EntryType> typename SpecEntryTraits<EntryType>::DeclType*
findSpecializationImpl(llvm::FoldingSetVector<EntryType> &Specs,
                       ArrayRef<TemplateArgument> Args, void *&InsertPos);

template <class Derived, class EntryType>
void addSpecializationImpl(llvm::FoldingSetVector<EntryType> &Specs,
                           EntryType *Entry, void *InsertPos);

struct CommonBase {
  CommonBase() : InstantiatedFromMember(nullptr, false) {}

  /// The template from which this was most
  /// directly instantiated (or null).
  ///
  /// The boolean value indicates whether this template
  /// was explicitly specialized.
  llvm::PointerIntPair<RedeclarableTemplateDecl*, 1, bool>
    InstantiatedFromMember;

  /// If non-null, points to an array of specializations (including
  /// partial specializations) known only by their external declaration IDs.
  ///
  /// The first value in the array is the number of specializations/partial
  /// specializations that follow.
  uint32_t *LazySpecializations = nullptr;
};

/// Pointer to the common data shared by all declarations of this
/// template.
mutable CommonBase *Common = nullptr;

/// Retrieves the "common" pointer shared by all (re-)declarations of
/// the same template. Calling this routine may implicitly allocate memory
/// for the common pointer.
CommonBase *getCommonPtr() const;

virtual CommonBase *newCommon(ASTContext &C) const = 0;

// Construct a template decl with name, parameters, and templated element.
RedeclarableTemplateDecl(ConstrainedTemplateDeclInfo *CTDI, Kind DK,
                         ASTContext &C, DeclContext *DC, SourceLocation L,
                         DeclarationName Name, TemplateParameterList *Params,
                         NamedDecl *Decl)
    : TemplateDecl(CTDI, DK, DC, L, Name, Params, Decl), redeclarable_base(C)
      {}

RedeclarableTemplateDecl(Kind DK, ASTContext &C, DeclContext *DC,
                         SourceLocation L, DeclarationName Name,
                         TemplateParameterList *Params, NamedDecl *Decl)
    : RedeclarableTemplateDecl(nullptr, DK, C, DC, L, Name, Params, Decl) {}

847public:
friend class ASTDeclReader;
friend class ASTDeclWriter;
friend class ASTReader;
template <class decl_type> friend class RedeclarableTemplate;

/// Retrieves the canonical declaration of this template.
RedeclarableTemplateDecl *getCanonicalDecl() override {
  return getFirstDecl();
}
const RedeclarableTemplateDecl *getCanonicalDecl() const {
  return getFirstDecl();
}

/// Determines whether this template was a specialization of a
/// member template.
///
/// In the following example, the function template \c X<int>::f and the
/// member template \c X<int>::Inner are member specializations.
///
/// \code
/// template<typename T>
/// struct X {
///   template<typename U> void f(T, U);
///   template<typename U> struct Inner;
/// };
///
/// template<> template<typename T>
/// void X<int>::f(int, T);
/// template<> template<typename T>
/// struct X<int>::Inner { /* ... */ };
/// \endcode
bool isMemberSpecialization() const {
  return getCommonPtr()->InstantiatedFromMember.getInt();
}

/// Note that this member template is a specialization.
void setMemberSpecialization() {
  assert(getCommonPtr()->InstantiatedFromMember.getPointer() &&(static_cast <bool> (getCommonPtr()->InstantiatedFromMember
.getPointer() && "Only member templates can be member template specializations"
) ? void (0) : __assert_fail ("getCommonPtr()->InstantiatedFromMember.getPointer() && \"Only member templates can be member template specializations\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 886, __extension__ __PRETTY_FUNCTION__))
         "Only member templates can be member template specializations")(static_cast <bool> (getCommonPtr()->InstantiatedFromMember
.getPointer() && "Only member templates can be member template specializations"
) ? void (0) : __assert_fail ("getCommonPtr()->InstantiatedFromMember.getPointer() && \"Only member templates can be member template specializations\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 886, __extension__ __PRETTY_FUNCTION__));
  getCommonPtr()->InstantiatedFromMember.setInt(true);
}

/// Retrieve the member template from which this template was
/// instantiated, or nullptr if this template was not instantiated from a 
/// member template.
///
/// A template is instantiated from a member template when the member 
/// template itself is part of a class template (or member thereof). For
/// example, given
///
/// \code
/// template<typename T>
/// struct X {
///   template<typename U> void f(T, U);
/// };
///
/// void test(X<int> x) {
///   x.f(1, 'a');
/// };
/// \endcode
///
/// \c X<int>::f is a FunctionTemplateDecl that describes the function
/// template
///
/// \code
/// template<typename U> void X<int>::f(int, U);
/// \endcode
///
/// which was itself created during the instantiation of \c X<int>. Calling
/// getInstantiatedFromMemberTemplate() on this FunctionTemplateDecl will
/// retrieve the FunctionTemplateDecl for the original template \c f within
/// the class template \c X<T>, i.e.,
///
/// \code
/// template<typename T>
/// template<typename U>
/// void X<T>::f(T, U);
/// \endcode
RedeclarableTemplateDecl *getInstantiatedFromMemberTemplate() const {
  return getCommonPtr()->InstantiatedFromMember.getPointer();
}

void setInstantiatedFromMemberTemplate(RedeclarableTemplateDecl *TD) {
  assert(!getCommonPtr()->InstantiatedFromMember.getPointer())(static_cast <bool> (!getCommonPtr()->InstantiatedFromMember
.getPointer()) ? void (0) : __assert_fail ("!getCommonPtr()->InstantiatedFromMember.getPointer()"
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 931, __extension__ __PRETTY_FUNCTION__));
  getCommonPtr()->InstantiatedFromMember.setPointer(TD);
}

using redecl_range = redeclarable_base::redecl_range;
using redecl_iterator = redeclarable_base::redecl_iterator;

using redeclarable_base::redecls_begin;
using redeclarable_base::redecls_end;
using redeclarable_base::redecls;
using redeclarable_base::getPreviousDecl;
using redeclarable_base::getMostRecentDecl;
using redeclarable_base::isFirstDecl;

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }

static bool classofKind(Kind K) {
  return K >= firstRedeclarableTemplate && K <= lastRedeclarableTemplate;
}
951};

953template <> struct RedeclarableTemplateDecl::
954SpecEntryTraits<FunctionTemplateSpecializationInfo> {
using DeclType = FunctionDecl;

static DeclType *getDecl(FunctionTemplateSpecializationInfo *I) {
  return I->Function;
}

static ArrayRef<TemplateArgument>
getTemplateArgs(FunctionTemplateSpecializationInfo *I) {
  return I->TemplateArguments->asArray();
}
965};

967/// Declaration of a template function.
968class FunctionTemplateDecl : public RedeclarableTemplateDecl {
969protected:
friend class FunctionDecl;

/// Data that is common to all of the declarations of a given
/// function template.
struct Common : CommonBase {
  /// The function template specializations for this function
  /// template, including explicit specializations and instantiations.
  llvm::FoldingSetVector<FunctionTemplateSpecializationInfo> Specializations;

  /// The set of "injected" template arguments used within this
  /// function template.
  ///
  /// This pointer refers to the template arguments (there are as
  /// many template arguments as template parameaters) for the function
  /// template, and is allocated lazily, since most function templates do not
  /// require the use of this information.
  TemplateArgument *InjectedArgs = nullptr;

  Common() = default;
};

FunctionTemplateDecl(ASTContext &C, DeclContext *DC, SourceLocation L,
                     DeclarationName Name, TemplateParameterList *Params,
                     NamedDecl *Decl)
    : RedeclarableTemplateDecl(FunctionTemplate, C, DC, L, Name, Params,
                               Decl) {}

CommonBase *newCommon(ASTContext &C) const override;

Common *getCommonPtr() const {
  return static_cast<Common *>(RedeclarableTemplateDecl::getCommonPtr());
}

/// Retrieve the set of function template specializations of this
/// function template.
llvm::FoldingSetVector<FunctionTemplateSpecializationInfo> &
getSpecializations() const;

/// Add a specialization of this function template.
///
/// \param InsertPos Insert position in the FoldingSetVector, must have been
///        retrieved by an earlier call to findSpecialization().
void addSpecialization(FunctionTemplateSpecializationInfo* Info,
                       void *InsertPos);

1015public:
friend class ASTDeclReader;
friend class ASTDeclWriter;

/// Load any lazily-loaded specializations from the external source.
void LoadLazySpecializations() const;

/// Get the underlying function declaration of the template.
FunctionDecl *getTemplatedDecl() const {
  return static_cast<FunctionDecl *>(TemplatedDecl);
}

/// Returns whether this template declaration defines the primary
/// pattern.
bool isThisDeclarationADefinition() const {
  return getTemplatedDecl()->isThisDeclarationADefinition();
}

/// Return the specialization with the provided arguments if it exists,
/// otherwise return the insertion point.
FunctionDecl *findSpecialization(ArrayRef<TemplateArgument> Args,
                                 void *&InsertPos);

FunctionTemplateDecl *getCanonicalDecl() override {
  return cast<FunctionTemplateDecl>(
           RedeclarableTemplateDecl::getCanonicalDecl());
}
const FunctionTemplateDecl *getCanonicalDecl() const {
  return cast<FunctionTemplateDecl>(
           RedeclarableTemplateDecl::getCanonicalDecl());
}

/// Retrieve the previous declaration of this function template, or
/// nullptr if no such declaration exists.
FunctionTemplateDecl *getPreviousDecl() {
  return cast_or_null<FunctionTemplateDecl>(
           static_cast<RedeclarableTemplateDecl *>(this)->getPreviousDecl());
}
const FunctionTemplateDecl *getPreviousDecl() const {
  return cast_or_null<FunctionTemplateDecl>(
     static_cast<const RedeclarableTemplateDecl *>(this)->getPreviousDecl());
}

FunctionTemplateDecl *getMostRecentDecl() {
  return cast<FunctionTemplateDecl>(
      static_cast<RedeclarableTemplateDecl *>(this)
          ->getMostRecentDecl());
}
const FunctionTemplateDecl *getMostRecentDecl() const {
  return const_cast<FunctionTemplateDecl*>(this)->getMostRecentDecl();
}

FunctionTemplateDecl *getInstantiatedFromMemberTemplate() const {
  return cast_or_null<FunctionTemplateDecl>(
           RedeclarableTemplateDecl::getInstantiatedFromMemberTemplate());
}

using spec_iterator = SpecIterator<FunctionTemplateSpecializationInfo>;
using spec_range = llvm::iterator_range<spec_iterator>;

spec_range specializations() const {
  return spec_range(spec_begin(), spec_end());
}

spec_iterator spec_begin() const {
  return makeSpecIterator(getSpecializations(), false);
}

spec_iterator spec_end() const {
  return makeSpecIterator(getSpecializations(), true);
}

/// Retrieve the "injected" template arguments that correspond to the
/// template parameters of this function template.
///
/// Although the C++ standard has no notion of the "injected" template
/// arguments for a function template, the notion is convenient when
/// we need to perform substitutions inside the definition of a function
/// template.
ArrayRef<TemplateArgument> getInjectedTemplateArgs();

/// Create a function template node.
static FunctionTemplateDecl *Create(ASTContext &C, DeclContext *DC,
                                    SourceLocation L,
                                    DeclarationName Name,
                                    TemplateParameterList *Params,
                                    NamedDecl *Decl);

/// Create an empty function template node.
static FunctionTemplateDecl *CreateDeserialized(ASTContext &C, unsigned ID);

// Implement isa/cast/dyncast support
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == FunctionTemplate; }
1109};

1111//===----------------------------------------------------------------------===//
1112// Kinds of Template Parameters
1113//===----------------------------------------------------------------------===//

1115/// Defines the position of a template parameter within a template
1116/// parameter list.
1117///
1118/// Because template parameter can be listed
1119/// sequentially for out-of-line template members, each template parameter is
1120/// given a Depth - the nesting of template parameter scopes - and a Position -
1121/// the occurrence within the parameter list.
1122/// This class is inheritedly privately by different kinds of template
1123/// parameters and is not part of the Decl hierarchy. Just a facility.
1124class TemplateParmPosition {
1125protected:
// FIXME: These probably don't need to be ints. int:5 for depth, int:8 for
// position? Maybe?
unsigned Depth;
unsigned Position;

TemplateParmPosition(unsigned D, unsigned P) : Depth(D), Position(P) {}

1133public:
TemplateParmPosition() = delete;

/// Get the nesting depth of the template parameter.
unsigned getDepth() const { return Depth; }
void setDepth(unsigned D) { Depth = D; }

/// Get the position of the template parameter within its parameter list.
unsigned getPosition() const { return Position; }
void setPosition(unsigned P) { Position = P; }

/// Get the index of the template parameter within its parameter list.
unsigned getIndex() const { return Position; }
1146};

1148/// Declaration of a template type parameter.
1149///
1150/// For example, "T" in
1151/// \code
1152/// template<typename T> class vector;
1153/// \endcode
1154class TemplateTypeParmDecl : public TypeDecl {
/// Sema creates these on the stack during auto type deduction.
friend class Sema;

/// Whether this template type parameter was declaration with
/// the 'typename' keyword.
///
/// If false, it was declared with the 'class' keyword.
bool Typename : 1;

/// The default template argument, if any.
using DefArgStorage =
    DefaultArgStorage<TemplateTypeParmDecl, TypeSourceInfo *>;
DefArgStorage DefaultArgument;

TemplateTypeParmDecl(DeclContext *DC, SourceLocation KeyLoc,
                     SourceLocation IdLoc, IdentifierInfo *Id,
                     bool Typename)
    : TypeDecl(TemplateTypeParm, DC, IdLoc, Id, KeyLoc), Typename(Typename) {}

1174public:
static TemplateTypeParmDecl *Create(const ASTContext &C, DeclContext *DC,
                                    SourceLocation KeyLoc,
                                    SourceLocation NameLoc,
                                    unsigned D, unsigned P,
                                    IdentifierInfo *Id, bool Typename,
                                    bool ParameterPack);
static TemplateTypeParmDecl *CreateDeserialized(const ASTContext &C, 
                                                unsigned ID);

/// Whether this template type parameter was declared with
/// the 'typename' keyword.
///
/// If not, it was declared with the 'class' keyword.
bool wasDeclaredWithTypename() const { return Typename; }

const DefArgStorage &getDefaultArgStorage() const { return DefaultArgument; }

/// Determine whether this template parameter has a default
/// argument.
bool hasDefaultArgument() const { return DefaultArgument.isSet(); }

/// Retrieve the default argument, if any.
QualType getDefaultArgument() const {
  return DefaultArgument.get()->getType();
}

/// Retrieves the default argument's source information, if any.
TypeSourceInfo *getDefaultArgumentInfo() const {
  return DefaultArgument.get();
}

/// Retrieves the location of the default argument declaration.
SourceLocation getDefaultArgumentLoc() const;

/// Determines whether the default argument was inherited
/// from a previous declaration of this template.
bool defaultArgumentWasInherited() const {
  return DefaultArgument.isInherited();
}

/// Set the default argument for this template parameter.
void setDefaultArgument(TypeSourceInfo *DefArg) {
  DefaultArgument.set(DefArg);
}

/// Set that this default argument was inherited from another
/// parameter.
void setInheritedDefaultArgument(const ASTContext &C,
                                 TemplateTypeParmDecl *Prev) {
  DefaultArgument.setInherited(C, Prev);
}

/// Removes the default argument of this template parameter.
void removeDefaultArgument() {
  DefaultArgument.clear();
}

/// Set whether this template type parameter was declared with
/// the 'typename' or 'class' keyword.
void setDeclaredWithTypename(bool withTypename) { Typename = withTypename; }

/// Retrieve the depth of the template parameter.
unsigned getDepth() const;

/// Retrieve the index of the template parameter.
unsigned getIndex() const;

/// Returns whether this is a parameter pack.
bool isParameterPack() const;

SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__));

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == TemplateTypeParm; }
1250};

1252/// NonTypeTemplateParmDecl - Declares a non-type template parameter,
1253/// e.g., "Size" in
1254/// @code
1255/// template<int Size> class array { };
1256/// @endcode
1257class NonTypeTemplateParmDecl final
  : public DeclaratorDecl,
    protected TemplateParmPosition,
    private llvm::TrailingObjects<NonTypeTemplateParmDecl,
                                  std::pair<QualType, TypeSourceInfo *>> {
friend class ASTDeclReader;
friend TrailingObjects;

/// The default template argument, if any, and whether or not
/// it was inherited.
using DefArgStorage = DefaultArgStorage<NonTypeTemplateParmDecl, Expr *>;
DefArgStorage DefaultArgument;

// FIXME: Collapse this into TemplateParamPosition; or, just move depth/index
// down here to save memory.

/// Whether this non-type template parameter is a parameter pack.
bool ParameterPack;

/// Whether this non-type template parameter is an "expanded"
/// parameter pack, meaning that its type is a pack expansion and we
/// already know the set of types that expansion expands to.
bool ExpandedParameterPack = false;

/// The number of types in an expanded parameter pack.
unsigned NumExpandedTypes = 0;

size_t numTrailingObjects(
    OverloadToken<std::pair<QualType, TypeSourceInfo *>>) const {
  return NumExpandedTypes;
}

NonTypeTemplateParmDecl(DeclContext *DC, SourceLocation StartLoc,
                        SourceLocation IdLoc, unsigned D, unsigned P,
                        IdentifierInfo *Id, QualType T,
                        bool ParameterPack, TypeSourceInfo *TInfo)
    : DeclaratorDecl(NonTypeTemplateParm, DC, IdLoc, Id, T, TInfo, StartLoc),
      TemplateParmPosition(D, P), ParameterPack(ParameterPack) {}

NonTypeTemplateParmDecl(DeclContext *DC, SourceLocation StartLoc,
                        SourceLocation IdLoc, unsigned D, unsigned P,
                        IdentifierInfo *Id, QualType T,
                        TypeSourceInfo *TInfo,
                        ArrayRef<QualType> ExpandedTypes,
                        ArrayRef<TypeSourceInfo *> ExpandedTInfos);

1303public:
static NonTypeTemplateParmDecl *
Create(const ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
       SourceLocation IdLoc, unsigned D, unsigned P, IdentifierInfo *Id,
       QualType T, bool ParameterPack, TypeSourceInfo *TInfo);

static NonTypeTemplateParmDecl *
Create(const ASTContext &C, DeclContext *DC, SourceLocation StartLoc,
       SourceLocation IdLoc, unsigned D, unsigned P, IdentifierInfo *Id,
       QualType T, TypeSourceInfo *TInfo, ArrayRef<QualType> ExpandedTypes,
       ArrayRef<TypeSourceInfo *> ExpandedTInfos);

static NonTypeTemplateParmDecl *CreateDeserialized(ASTContext &C, 
                                                   unsigned ID);
static NonTypeTemplateParmDecl *CreateDeserialized(ASTContext &C, 
                                                   unsigned ID,
                                                   unsigned NumExpandedTypes);
  
using TemplateParmPosition::getDepth;
using TemplateParmPosition::setDepth;
using TemplateParmPosition::getPosition;
using TemplateParmPosition::setPosition;
using TemplateParmPosition::getIndex;

SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__));

const DefArgStorage &getDefaultArgStorage() const { return DefaultArgument; }

/// Determine whether this template parameter has a default
/// argument.
bool hasDefaultArgument() const { return DefaultArgument.isSet(); }

/// Retrieve the default argument, if any.
Expr *getDefaultArgument() const { return DefaultArgument.get(); }

/// Retrieve the location of the default argument, if any.
SourceLocation getDefaultArgumentLoc() const;

/// Determines whether the default argument was inherited
/// from a previous declaration of this template.
bool defaultArgumentWasInherited() const {
  return DefaultArgument.isInherited();
}

/// Set the default argument for this template parameter, and
/// whether that default argument was inherited from another
/// declaration.
void setDefaultArgument(Expr *DefArg) { DefaultArgument.set(DefArg); }
void setInheritedDefaultArgument(const ASTContext &C,
                                 NonTypeTemplateParmDecl *Parm) {
  DefaultArgument.setInherited(C, Parm);
}

/// Removes the default argument of this template parameter.
void removeDefaultArgument() { DefaultArgument.clear(); }

/// Whether this parameter is a non-type template parameter pack.
///
/// If the parameter is a parameter pack, the type may be a
/// \c PackExpansionType. In the following example, the \c Dims parameter
/// is a parameter pack (whose type is 'unsigned').
///
/// \code
/// template<typename T, unsigned ...Dims> struct multi_array;
/// \endcode
bool isParameterPack() const { return ParameterPack; }

/// Whether this parameter pack is a pack expansion.
///
/// A non-type template parameter pack is a pack expansion if its type
/// contains an unexpanded parameter pack. In this case, we will have
/// built a PackExpansionType wrapping the type.
bool isPackExpansion() const {
  return ParameterPack && getType()->getAs<PackExpansionType>();
}

/// Whether this parameter is a non-type template parameter pack
/// that has a known list of different types at different positions.
///
/// A parameter pack is an expanded parameter pack when the original
/// parameter pack's type was itself a pack expansion, and that expansion
/// has already been expanded. For example, given:
///
/// \code
/// template<typename ...Types>
/// struct X {
///   template<Types ...Values>
///   struct Y { /* ... */ };
/// };
/// \endcode
///
/// The parameter pack \c Values has a \c PackExpansionType as its type,
/// which expands \c Types. When \c Types is supplied with template arguments
/// by instantiating \c X, the instantiation of \c Values becomes an
/// expanded parameter pack. For example, instantiating
/// \c X<int, unsigned int> results in \c Values being an expanded parameter
/// pack with expansion types \c int and \c unsigned int.
///
/// The \c getExpansionType() and \c getExpansionTypeSourceInfo() functions
/// return the expansion types.
bool isExpandedParameterPack() const { return ExpandedParameterPack; }

/// Retrieves the number of expansion types in an expanded parameter
/// pack.
unsigned getNumExpansionTypes() const {
  assert(ExpandedParameterPack && "Not an expansion parameter pack")(static_cast <bool> (ExpandedParameterPack && "Not an expansion parameter pack"
) ? void (0) : __assert_fail ("ExpandedParameterPack && \"Not an expansion parameter pack\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 1408, __extension__ __PRETTY_FUNCTION__));
  return NumExpandedTypes;
}

/// Retrieve a particular expansion type within an expanded parameter
/// pack.
QualType getExpansionType(unsigned I) const {
  assert(I < NumExpandedTypes && "Out-of-range expansion type index")(static_cast <bool> (I < NumExpandedTypes &&
 "Out-of-range expansion type index") ? void (0) : __assert_fail
 ("I < NumExpandedTypes && \"Out-of-range expansion type index\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 1415, __extension__ __PRETTY_FUNCTION__));
  auto TypesAndInfos =
      getTrailingObjects<std::pair<QualType, TypeSourceInfo *>>();
  return TypesAndInfos[I].first;
}

/// Retrieve a particular expansion type source info within an
/// expanded parameter pack.
TypeSourceInfo *getExpansionTypeSourceInfo(unsigned I) const {
  assert(I < NumExpandedTypes && "Out-of-range expansion type index")(static_cast <bool> (I < NumExpandedTypes &&
 "Out-of-range expansion type index") ? void (0) : __assert_fail
 ("I < NumExpandedTypes && \"Out-of-range expansion type index\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 1424, __extension__ __PRETTY_FUNCTION__));
  auto TypesAndInfos =
      getTrailingObjects<std::pair<QualType, TypeSourceInfo *>>();
  return TypesAndInfos[I].second;
}

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == NonTypeTemplateParm; }
1433};

1435/// TemplateTemplateParmDecl - Declares a template template parameter,
1436/// e.g., "T" in
1437/// @code
1438/// template <template <typename> class T> class container { };
1439/// @endcode
1440/// A template template parameter is a TemplateDecl because it defines the
1441/// name of a template and the template parameters allowable for substitution.
1442class TemplateTemplateParmDecl final
  : public TemplateDecl,
    protected TemplateParmPosition,
    private llvm::TrailingObjects<TemplateTemplateParmDecl,
                                  TemplateParameterList *> {
/// The default template argument, if any.
using DefArgStorage =
    DefaultArgStorage<TemplateTemplateParmDecl, TemplateArgumentLoc *>;
DefArgStorage DefaultArgument;

/// Whether this parameter is a parameter pack.
bool ParameterPack;

/// Whether this template template parameter is an "expanded"
/// parameter pack, meaning that it is a pack expansion and we
/// already know the set of template parameters that expansion expands to.
bool ExpandedParameterPack = false;

/// The number of parameters in an expanded parameter pack.
unsigned NumExpandedParams = 0;

TemplateTemplateParmDecl(DeclContext *DC, SourceLocation L,
                         unsigned D, unsigned P, bool ParameterPack,
                         IdentifierInfo *Id, TemplateParameterList *Params)
    : TemplateDecl(TemplateTemplateParm, DC, L, Id, Params),
      TemplateParmPosition(D, P), ParameterPack(ParameterPack) {}

TemplateTemplateParmDecl(DeclContext *DC, SourceLocation L,
                         unsigned D, unsigned P,
                         IdentifierInfo *Id, TemplateParameterList *Params,
                         ArrayRef<TemplateParameterList *> Expansions);

void anchor() override;

1476public:
friend class ASTDeclReader;
friend class ASTDeclWriter;
friend TrailingObjects;

static TemplateTemplateParmDecl *Create(const ASTContext &C, DeclContext *DC,
                                        SourceLocation L, unsigned D,
                                        unsigned P, bool ParameterPack,
                                        IdentifierInfo *Id,
                                        TemplateParameterList *Params);
static TemplateTemplateParmDecl *Create(const ASTContext &C, DeclContext *DC,
                                        SourceLocation L, unsigned D,
                                        unsigned P,
                                        IdentifierInfo *Id,
                                        TemplateParameterList *Params,
                               ArrayRef<TemplateParameterList *> Expansions);

static TemplateTemplateParmDecl *CreateDeserialized(ASTContext &C,
                                                    unsigned ID);
static TemplateTemplateParmDecl *CreateDeserialized(ASTContext &C,
                                                    unsigned ID,
                                                    unsigned NumExpansions);

using TemplateParmPosition::getDepth;
using TemplateParmPosition::setDepth;
using TemplateParmPosition::getPosition;
using TemplateParmPosition::setPosition;
using TemplateParmPosition::getIndex;

/// Whether this template template parameter is a template
/// parameter pack.
///
/// \code
/// template<template <class T> ...MetaFunctions> struct Apply;
/// \endcode
bool isParameterPack() const { return ParameterPack; }

/// Whether this parameter pack is a pack expansion.
///
/// A template template parameter pack is a pack expansion if its template
/// parameter list contains an unexpanded parameter pack.
bool isPackExpansion() const {
  return ParameterPack &&
         getTemplateParameters()->containsUnexpandedParameterPack();
}

/// Whether this parameter is a template template parameter pack that
/// has a known list of different template parameter lists at different
/// positions.
///
/// A parameter pack is an expanded parameter pack when the original parameter
/// pack's template parameter list was itself a pack expansion, and that
/// expansion has already been expanded. For exampe, given:
///
/// \code
/// template<typename...Types> struct Outer {
///   template<template<Types> class...Templates> struct Inner;
/// };
/// \endcode
///
/// The parameter pack \c Templates is a pack expansion, which expands the
/// pack \c Types. When \c Types is supplied with template arguments by
/// instantiating \c Outer, the instantiation of \c Templates is an expanded
/// parameter pack.
bool isExpandedParameterPack() const { return ExpandedParameterPack; }

/// Retrieves the number of expansion template parameters in
/// an expanded parameter pack.
unsigned getNumExpansionTemplateParameters() const {
  assert(ExpandedParameterPack && "Not an expansion parameter pack")(static_cast <bool> (ExpandedParameterPack && "Not an expansion parameter pack"
) ? void (0) : __assert_fail ("ExpandedParameterPack && \"Not an expansion parameter pack\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 1545, __extension__ __PRETTY_FUNCTION__));
  return NumExpandedParams;
}

/// Retrieve a particular expansion type within an expanded parameter
/// pack.
TemplateParameterList *getExpansionTemplateParameters(unsigned I) const {
  assert(I < NumExpandedParams && "Out-of-range expansion type index")(static_cast <bool> (I < NumExpandedParams &&
 "Out-of-range expansion type index") ? void (0) : __assert_fail
 ("I < NumExpandedParams && \"Out-of-range expansion type index\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 1552, __extension__ __PRETTY_FUNCTION__));
  return getTrailingObjects<TemplateParameterList *>()[I];
}

const DefArgStorage &getDefaultArgStorage() const { return DefaultArgument; }

/// Determine whether this template parameter has a default
/// argument.
bool hasDefaultArgument() const { return DefaultArgument.isSet(); }

/// Retrieve the default argument, if any.
const TemplateArgumentLoc &getDefaultArgument() const {
  static const TemplateArgumentLoc None;
  return DefaultArgument.isSet() ? *DefaultArgument.get() : None;
}

/// Retrieve the location of the default argument, if any.
SourceLocation getDefaultArgumentLoc() const;

/// Determines whether the default argument was inherited
/// from a previous declaration of this template.
bool defaultArgumentWasInherited() const {
  return DefaultArgument.isInherited();
}

/// Set the default argument for this template parameter, and
/// whether that default argument was inherited from another
/// declaration.
void setDefaultArgument(const ASTContext &C,
                        const TemplateArgumentLoc &DefArg);
void setInheritedDefaultArgument(const ASTContext &C,
                                 TemplateTemplateParmDecl *Prev) {
  DefaultArgument.setInherited(C, Prev);
}

/// Removes the default argument of this template parameter.
void removeDefaultArgument() { DefaultArgument.clear(); }

SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) {
  SourceLocation End = getLocation();
  if (hasDefaultArgument() && !defaultArgumentWasInherited())
    End = getDefaultArgument().getSourceRange().getEnd();
  return SourceRange(getTemplateParameters()->getTemplateLoc(), End);
}

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == TemplateTemplateParm; }
1600};

1602/// Represents the builtin template declaration which is used to
1603/// implement __make_integer_seq and other builtin templates.  It serves
1604/// no real purpose beyond existing as a place to hold template parameters.
1605class BuiltinTemplateDecl : public TemplateDecl {
BuiltinTemplateKind BTK;

BuiltinTemplateDecl(const ASTContext &C, DeclContext *DC,
                    DeclarationName Name, BuiltinTemplateKind BTK);

void anchor() override;

1613public:
// Implement isa/cast/dyncast support
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == BuiltinTemplate; }

static BuiltinTemplateDecl *Create(const ASTContext &C, DeclContext *DC,
                                   DeclarationName Name,
                                   BuiltinTemplateKind BTK) {
  return new (C, DC) BuiltinTemplateDecl(C, DC, Name, BTK);
}

SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) {
  return {};
}

BuiltinTemplateKind getBuiltinTemplateKind() const { return BTK; }
1629};

1631/// Represents a class template specialization, which refers to
1632/// a class template with a given set of template arguments.
1633///
1634/// Class template specializations represent both explicit
1635/// specialization of class templates, as in the example below, and
1636/// implicit instantiations of class templates.
1637///
1638/// \code
1639/// template<typename T> class array;
1640///
1641/// template<>
1642/// class array<bool> { }; // class template specialization array<bool>
1643/// \endcode
1644class ClassTemplateSpecializationDecl
: public CXXRecordDecl, public llvm::FoldingSetNode {
/// Structure that stores information about a class template
/// specialization that was instantiated from a class template partial
/// specialization.
struct SpecializedPartialSpecialization {
  /// The class template partial specialization from which this
  /// class template specialization was instantiated.
  ClassTemplatePartialSpecializationDecl *PartialSpecialization;

  /// The template argument list deduced for the class template
  /// partial specialization itself.
  const TemplateArgumentList *TemplateArgs;
};

/// The template that this specialization specializes
llvm::PointerUnion<ClassTemplateDecl *, SpecializedPartialSpecialization *>
  SpecializedTemplate;

/// Further info for explicit template specialization/instantiation.
struct ExplicitSpecializationInfo {
  /// The type-as-written.
  TypeSourceInfo *TypeAsWritten = nullptr;

  /// The location of the extern keyword.
  SourceLocation ExternLoc;

  /// The location of the template keyword.
  SourceLocation TemplateKeywordLoc;

  ExplicitSpecializationInfo() = default;
};

/// Further info for explicit template specialization/instantiation.
/// Does not apply to implicit specializations.
ExplicitSpecializationInfo *ExplicitInfo = nullptr;

/// The template arguments used to describe this specialization.
const TemplateArgumentList *TemplateArgs;

/// The point where this template was instantiated (if any)
SourceLocation PointOfInstantiation;

/// The kind of specialization this declaration refers to.
/// Really a value of type TemplateSpecializationKind.
unsigned SpecializationKind : 3;

1691protected:
ClassTemplateSpecializationDecl(ASTContext &Context, Kind DK, TagKind TK,
                                DeclContext *DC, SourceLocation StartLoc,
                                SourceLocation IdLoc,
                                ClassTemplateDecl *SpecializedTemplate,
                                ArrayRef<TemplateArgument> Args,
                                ClassTemplateSpecializationDecl *PrevDecl);

explicit ClassTemplateSpecializationDecl(ASTContext &C, Kind DK);

1701public:
friend class ASTDeclReader;
friend class ASTDeclWriter;

static ClassTemplateSpecializationDecl *
Create(ASTContext &Context, TagKind TK, DeclContext *DC,
       SourceLocation StartLoc, SourceLocation IdLoc,
       ClassTemplateDecl *SpecializedTemplate,
       ArrayRef<TemplateArgument> Args,
       ClassTemplateSpecializationDecl *PrevDecl);
static ClassTemplateSpecializationDecl *
CreateDeserialized(ASTContext &C, unsigned ID);

void getNameForDiagnostic(raw_ostream &OS, const PrintingPolicy &Policy,
                          bool Qualified) const override;

// FIXME: This is broken. CXXRecordDecl::getMostRecentDecl() returns a
// different "most recent" declaration from this function for the same
// declaration, because we don't override getMostRecentDeclImpl(). But
// it's not clear that we should override that, because the most recent
// declaration as a CXXRecordDecl sometimes is the injected-class-name.
ClassTemplateSpecializationDecl *getMostRecentDecl() {
  return cast<ClassTemplateSpecializationDecl>(
      getMostRecentNonInjectedDecl());
}

/// Retrieve the template that this specialization specializes.
ClassTemplateDecl *getSpecializedTemplate() const;

/// Retrieve the template arguments of the class template
/// specialization.
const TemplateArgumentList &getTemplateArgs() const {
  return *TemplateArgs;
}

/// Determine the kind of specialization that this
/// declaration represents.
TemplateSpecializationKind getSpecializationKind() const {
  return static_cast<TemplateSpecializationKind>(SpecializationKind);
}

bool isExplicitSpecialization() const {
  return getSpecializationKind() == TSK_ExplicitSpecialization;
}

/// True if this declaration is an explicit specialization,
/// explicit instantiation declaration, or explicit instantiation
/// definition.
bool isExplicitInstantiationOrSpecialization() const {
  return isTemplateExplicitInstantiationOrSpecialization(
      getTemplateSpecializationKind());
}

void setSpecializationKind(TemplateSpecializationKind TSK) {
  SpecializationKind = TSK;
}

/// Get the point of instantiation (if any), or null if none.
SourceLocation getPointOfInstantiation() const {
  return PointOfInstantiation;
}

void setPointOfInstantiation(SourceLocation Loc) {
  assert(Loc.isValid() && "point of instantiation must be valid!")(static_cast <bool> (Loc.isValid() && "point of instantiation must be valid!"
) ? void (0) : __assert_fail ("Loc.isValid() && \"point of instantiation must be valid!\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 1764, __extension__ __PRETTY_FUNCTION__));
  PointOfInstantiation = Loc;
}

/// If this class template specialization is an instantiation of
/// a template (rather than an explicit specialization), return the
/// class template or class template partial specialization from which it
/// was instantiated.
llvm::PointerUnion<ClassTemplateDecl *,
                   ClassTemplatePartialSpecializationDecl *>
getInstantiatedFrom() const {
  if (!isTemplateInstantiation(getSpecializationKind()))
    return llvm::PointerUnion<ClassTemplateDecl *,
                              ClassTemplatePartialSpecializationDecl *>();

  return getSpecializedTemplateOrPartial();
}

/// Retrieve the class template or class template partial
/// specialization which was specialized by this.
llvm::PointerUnion<ClassTemplateDecl *,
                   ClassTemplatePartialSpecializationDecl *>
getSpecializedTemplateOrPartial() const {
  if (const auto *PartialSpec =
          SpecializedTemplate.dyn_cast<SpecializedPartialSpecialization *>())
    return PartialSpec->PartialSpecialization;

  return SpecializedTemplate.get<ClassTemplateDecl*>();
}

/// Retrieve the set of template arguments that should be used
/// to instantiate members of the class template or class template partial
/// specialization from which this class template specialization was
/// instantiated.
///
/// \returns For a class template specialization instantiated from the primary
/// template, this function will return the same template arguments as
/// getTemplateArgs(). For a class template specialization instantiated from
/// a class template partial specialization, this function will return the
/// deduced template arguments for the class template partial specialization
/// itself.
const TemplateArgumentList &getTemplateInstantiationArgs() const {
  if (const auto *PartialSpec =
          SpecializedTemplate.dyn_cast<SpecializedPartialSpecialization *>())
    return *PartialSpec->TemplateArgs;

  return getTemplateArgs();
}

/// Note that this class template specialization is actually an
/// instantiation of the given class template partial specialization whose
/// template arguments have been deduced.
void setInstantiationOf(ClassTemplatePartialSpecializationDecl *PartialSpec,
                        const TemplateArgumentList *TemplateArgs) {
  assert(!SpecializedTemplate.is<SpecializedPartialSpecialization*>() &&(static_cast <bool> (!SpecializedTemplate.is<SpecializedPartialSpecialization
*>() && "Already set to a class template partial specialization!"
) ? void (0) : __assert_fail ("!SpecializedTemplate.is<SpecializedPartialSpecialization*>() && \"Already set to a class template partial specialization!\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 1819, __extension__ __PRETTY_FUNCTION__))
         "Already set to a class template partial specialization!")(static_cast <bool> (!SpecializedTemplate.is<SpecializedPartialSpecialization
*>() && "Already set to a class template partial specialization!"
) ? void (0) : __assert_fail ("!SpecializedTemplate.is<SpecializedPartialSpecialization*>() && \"Already set to a class template partial specialization!\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 1819, __extension__ __PRETTY_FUNCTION__));
  auto *PS = new (getASTContext()) SpecializedPartialSpecialization();
16
←
'PS' initialized to a null pointer value→
  PS->PartialSpecialization = PartialSpec;
17
←
Access to field 'PartialSpecialization' results in a dereference of a null pointer (loaded from variable 'PS')
  PS->TemplateArgs = TemplateArgs;
  SpecializedTemplate = PS;
}

/// Note that this class template specialization is an instantiation
/// of the given class template.
void setInstantiationOf(ClassTemplateDecl *TemplDecl) {
  assert(!SpecializedTemplate.is<SpecializedPartialSpecialization*>() &&(static_cast <bool> (!SpecializedTemplate.is<SpecializedPartialSpecialization
*>() && "Previously set to a class template partial specialization!"
) ? void (0) : __assert_fail ("!SpecializedTemplate.is<SpecializedPartialSpecialization*>() && \"Previously set to a class template partial specialization!\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 1830, __extension__ __PRETTY_FUNCTION__))
         "Previously set to a class template partial specialization!")(static_cast <bool> (!SpecializedTemplate.is<SpecializedPartialSpecialization
*>() && "Previously set to a class template partial specialization!"
) ? void (0) : __assert_fail ("!SpecializedTemplate.is<SpecializedPartialSpecialization*>() && \"Previously set to a class template partial specialization!\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 1830, __extension__ __PRETTY_FUNCTION__));
  SpecializedTemplate = TemplDecl;
}

/// Sets the type of this specialization as it was written by
/// the user. This will be a class template specialization type.
void setTypeAsWritten(TypeSourceInfo *T) {
  if (!ExplicitInfo)
    ExplicitInfo = new (getASTContext()) ExplicitSpecializationInfo;
  ExplicitInfo->TypeAsWritten = T;
}

/// Gets the type of this specialization as it was written by
/// the user, if it was so written.
TypeSourceInfo *getTypeAsWritten() const {
  return ExplicitInfo ? ExplicitInfo->TypeAsWritten : nullptr;
}

/// Gets the location of the extern keyword, if present.
SourceLocation getExternLoc() const {
  return ExplicitInfo ? ExplicitInfo->ExternLoc : SourceLocation();
}

/// Sets the location of the extern keyword.
void setExternLoc(SourceLocation Loc) {
  if (!ExplicitInfo)
    ExplicitInfo = new (getASTContext()) ExplicitSpecializationInfo;
  ExplicitInfo->ExternLoc = Loc;
}

/// Sets the location of the template keyword.
void setTemplateKeywordLoc(SourceLocation Loc) {
  if (!ExplicitInfo)
    ExplicitInfo = new (getASTContext()) ExplicitSpecializationInfo;
  ExplicitInfo->TemplateKeywordLoc = Loc;
}

/// Gets the location of the template keyword, if present.
SourceLocation getTemplateKeywordLoc() const {
  return ExplicitInfo ? ExplicitInfo->TemplateKeywordLoc : SourceLocation();
}

SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__));

void Profile(llvm::FoldingSetNodeID &ID) const {
  Profile(ID, TemplateArgs->asArray(), getASTContext());
}

static void
Profile(llvm::FoldingSetNodeID &ID, ArrayRef<TemplateArgument> TemplateArgs,
        ASTContext &Context) {
  ID.AddInteger(TemplateArgs.size());
  for (const TemplateArgument &TemplateArg : TemplateArgs)
    TemplateArg.Profile(ID, Context);
}

static bool classof(const Decl *D) { return classofKind(D->getKind()); }

static bool classofKind(Kind K) {
  return K >= firstClassTemplateSpecialization &&
         K <= lastClassTemplateSpecialization;
}
1892};

1894class ClassTemplatePartialSpecializationDecl
: public ClassTemplateSpecializationDecl {
/// The list of template parameters
TemplateParameterList* TemplateParams = nullptr;

/// The source info for the template arguments as written.
/// FIXME: redundant with TypeAsWritten?
const ASTTemplateArgumentListInfo *ArgsAsWritten = nullptr;

/// The class template partial specialization from which this
/// class template partial specialization was instantiated.
///
/// The boolean value will be true to indicate that this class template
/// partial specialization was specialized at this level.
llvm::PointerIntPair<ClassTemplatePartialSpecializationDecl *, 1, bool>
    InstantiatedFromMember;

ClassTemplatePartialSpecializationDecl(ASTContext &Context, TagKind TK,
                                       DeclContext *DC,
                                       SourceLocation StartLoc,
                                       SourceLocation IdLoc,
                                       TemplateParameterList *Params,
                                       ClassTemplateDecl *SpecializedTemplate,
                                       ArrayRef<TemplateArgument> Args,
                             const ASTTemplateArgumentListInfo *ArgsAsWritten,
                             ClassTemplatePartialSpecializationDecl *PrevDecl);

ClassTemplatePartialSpecializationDecl(ASTContext &C)
  : ClassTemplateSpecializationDecl(C, ClassTemplatePartialSpecialization),
    InstantiatedFromMember(nullptr, false) {}

void anchor() override;

1927public:
friend class ASTDeclReader;
friend class ASTDeclWriter;

static ClassTemplatePartialSpecializationDecl *
Create(ASTContext &Context, TagKind TK, DeclContext *DC,
       SourceLocation StartLoc, SourceLocation IdLoc,
       TemplateParameterList *Params,
       ClassTemplateDecl *SpecializedTemplate,
       ArrayRef<TemplateArgument> Args,
       const TemplateArgumentListInfo &ArgInfos,
       QualType CanonInjectedType,
       ClassTemplatePartialSpecializationDecl *PrevDecl);

static ClassTemplatePartialSpecializationDecl *
CreateDeserialized(ASTContext &C, unsigned ID);

ClassTemplatePartialSpecializationDecl *getMostRecentDecl() {
  return cast<ClassTemplatePartialSpecializationDecl>(
           static_cast<ClassTemplateSpecializationDecl *>(
             this)->getMostRecentDecl());
}

/// Get the list of template parameters
TemplateParameterList *getTemplateParameters() const {
  return TemplateParams;
}

/// Get the template arguments as written.
const ASTTemplateArgumentListInfo *getTemplateArgsAsWritten() const {
  return ArgsAsWritten;
}

/// Retrieve the member class template partial specialization from
/// which this particular class template partial specialization was
/// instantiated.
///
/// \code
/// template<typename T>
/// struct Outer {
///   template<typename U> struct Inner;
///   template<typename U> struct Inner<U*> { }; // #1
/// };
///
/// Outer<float>::Inner<int*> ii;
/// \endcode
///
/// In this example, the instantiation of \c Outer<float>::Inner<int*> will
/// end up instantiating the partial specialization
/// \c Outer<float>::Inner<U*>, which itself was instantiated from the class
/// template partial specialization \c Outer<T>::Inner<U*>. Given
/// \c Outer<float>::Inner<U*>, this function would return
/// \c Outer<T>::Inner<U*>.
ClassTemplatePartialSpecializationDecl *getInstantiatedFromMember() const {
  const auto *First =
      cast<ClassTemplatePartialSpecializationDecl>(getFirstDecl());
  return First->InstantiatedFromMember.getPointer();
}
ClassTemplatePartialSpecializationDecl *
getInstantiatedFromMemberTemplate() const {
  return getInstantiatedFromMember();
}

void setInstantiatedFromMember(
                        ClassTemplatePartialSpecializationDecl *PartialSpec) {
  auto *First = cast<ClassTemplatePartialSpecializationDecl>(getFirstDecl());
  First->InstantiatedFromMember.setPointer(PartialSpec);
}

/// Determines whether this class template partial specialization
/// template was a specialization of a member partial specialization.
///
/// In the following example, the member template partial specialization
/// \c X<int>::Inner<T*> is a member specialization.
///
/// \code
/// template<typename T>
/// struct X {
///   template<typename U> struct Inner;
///   template<typename U> struct Inner<U*>;
/// };
///
/// template<> template<typename T>
/// struct X<int>::Inner<T*> { /* ... */ };
/// \endcode
bool isMemberSpecialization() {
  const auto *First =
      cast<ClassTemplatePartialSpecializationDecl>(getFirstDecl());
  return First->InstantiatedFromMember.getInt();
}

/// Note that this member template is a specialization.
void setMemberSpecialization() {
  auto *First = cast<ClassTemplatePartialSpecializationDecl>(getFirstDecl());
  assert(First->InstantiatedFromMember.getPointer() &&(static_cast <bool> (First->InstantiatedFromMember.getPointer
() && "Only member templates can be member template specializations"
) ? void (0) : __assert_fail ("First->InstantiatedFromMember.getPointer() && \"Only member templates can be member template specializations\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 2022, __extension__ __PRETTY_FUNCTION__))
         "Only member templates can be member template specializations")(static_cast <bool> (First->InstantiatedFromMember.getPointer
() && "Only member templates can be member template specializations"
) ? void (0) : __assert_fail ("First->InstantiatedFromMember.getPointer() && \"Only member templates can be member template specializations\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 2022, __extension__ __PRETTY_FUNCTION__));
  return First->InstantiatedFromMember.setInt(true);
}

/// Retrieves the injected specialization type for this partial
/// specialization.  This is not the same as the type-decl-type for
/// this partial specialization, which is an InjectedClassNameType.
QualType getInjectedSpecializationType() const {
  assert(getTypeForDecl() && "partial specialization has no type set!")(static_cast <bool> (getTypeForDecl() && "partial specialization has no type set!"
) ? void (0) : __assert_fail ("getTypeForDecl() && \"partial specialization has no type set!\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 2030, __extension__ __PRETTY_FUNCTION__));
  return cast<InjectedClassNameType>(getTypeForDecl())
           ->getInjectedSpecializationType();
}

// FIXME: Add Profile support!

static bool classof(const Decl *D) { return classofKind(D->getKind()); }

static bool classofKind(Kind K) {
  return K == ClassTemplatePartialSpecialization;
}
2042};

2044/// Declaration of a class template.
2045class ClassTemplateDecl : public RedeclarableTemplateDecl {
2046protected:
/// Data that is common to all of the declarations of a given
/// class template.
struct Common : CommonBase {
  /// The class template specializations for this class
  /// template, including explicit specializations and instantiations.
  llvm::FoldingSetVector<ClassTemplateSpecializationDecl> Specializations;

  /// The class template partial specializations for this class
  /// template.
  llvm::FoldingSetVector<ClassTemplatePartialSpecializationDecl>
    PartialSpecializations;

  /// The injected-class-name type for this class template.
  QualType InjectedClassNameType;

  Common() = default;
};

/// Retrieve the set of specializations of this class template.
llvm::FoldingSetVector<ClassTemplateSpecializationDecl> &
getSpecializations() const;

/// Retrieve the set of partial specializations of this class
/// template.
llvm::FoldingSetVector<ClassTemplatePartialSpecializationDecl> &
getPartialSpecializations();

ClassTemplateDecl(ConstrainedTemplateDeclInfo *CTDI, ASTContext &C,
                  DeclContext *DC, SourceLocation L, DeclarationName Name,
                  TemplateParameterList *Params, NamedDecl *Decl)
    : RedeclarableTemplateDecl(CTDI, ClassTemplate, C, DC, L, Name, Params,
                               Decl) {}

ClassTemplateDecl(ASTContext &C, DeclContext *DC, SourceLocation L,
                  DeclarationName Name, TemplateParameterList *Params,
                  NamedDecl *Decl)
    : ClassTemplateDecl(nullptr, C, DC, L, Name, Params, Decl) {}

CommonBase *newCommon(ASTContext &C) const override;

Common *getCommonPtr() const {
  return static_cast<Common *>(RedeclarableTemplateDecl::getCommonPtr());
}

2091public:
friend class ASTDeclReader;
friend class ASTDeclWriter;

/// Load any lazily-loaded specializations from the external source.
void LoadLazySpecializations() const;

/// Get the underlying class declarations of the template.
CXXRecordDecl *getTemplatedDecl() const {
  return static_cast<CXXRecordDecl *>(TemplatedDecl);
}

/// Returns whether this template declaration defines the primary
/// class pattern.
bool isThisDeclarationADefinition() const {
  return getTemplatedDecl()->isThisDeclarationADefinition();
}

// FIXME: remove default argument for AssociatedConstraints
/// Create a class template node.
static ClassTemplateDecl *Create(ASTContext &C, DeclContext *DC,
                                 SourceLocation L,
                                 DeclarationName Name,
                                 TemplateParameterList *Params,
                                 NamedDecl *Decl,
                                 Expr *AssociatedConstraints = nullptr);

/// Create an empty class template node.
static ClassTemplateDecl *CreateDeserialized(ASTContext &C, unsigned ID);

/// Return the specialization with the provided arguments if it exists,
/// otherwise return the insertion point.
ClassTemplateSpecializationDecl *
findSpecialization(ArrayRef<TemplateArgument> Args, void *&InsertPos);

/// Insert the specified specialization knowing that it is not already
/// in. InsertPos must be obtained from findSpecialization.
void AddSpecialization(ClassTemplateSpecializationDecl *D, void *InsertPos);

ClassTemplateDecl *getCanonicalDecl() override {
  return cast<ClassTemplateDecl>(
           RedeclarableTemplateDecl::getCanonicalDecl());
}
const ClassTemplateDecl *getCanonicalDecl() const {
  return cast<ClassTemplateDecl>(
           RedeclarableTemplateDecl::getCanonicalDecl());
}

/// Retrieve the previous declaration of this class template, or
/// nullptr if no such declaration exists.
ClassTemplateDecl *getPreviousDecl() {
  return cast_or_null<ClassTemplateDecl>(
           static_cast<RedeclarableTemplateDecl *>(this)->getPreviousDecl());
}
const ClassTemplateDecl *getPreviousDecl() const {
  return cast_or_null<ClassTemplateDecl>(
           static_cast<const RedeclarableTemplateDecl *>(
             this)->getPreviousDecl());
}

ClassTemplateDecl *getMostRecentDecl() {
  return cast<ClassTemplateDecl>(
      static_cast<RedeclarableTemplateDecl *>(this)->getMostRecentDecl());
}
const ClassTemplateDecl *getMostRecentDecl() const {
  return const_cast<ClassTemplateDecl*>(this)->getMostRecentDecl();
}

ClassTemplateDecl *getInstantiatedFromMemberTemplate() const {
  return cast_or_null<ClassTemplateDecl>(
           RedeclarableTemplateDecl::getInstantiatedFromMemberTemplate());
}

/// Return the partial specialization with the provided arguments if it
/// exists, otherwise return the insertion point.
ClassTemplatePartialSpecializationDecl *
findPartialSpecialization(ArrayRef<TemplateArgument> Args, void *&InsertPos);

/// Insert the specified partial specialization knowing that it is not
/// already in. InsertPos must be obtained from findPartialSpecialization.
void AddPartialSpecialization(ClassTemplatePartialSpecializationDecl *D,
                              void *InsertPos);

/// Retrieve the partial specializations as an ordered list.
void getPartialSpecializations(
        SmallVectorImpl<ClassTemplatePartialSpecializationDecl *> &PS);

/// Find a class template partial specialization with the given
/// type T.
///
/// \param T a dependent type that names a specialization of this class
/// template.
///
/// \returns the class template partial specialization that exactly matches
/// the type \p T, or nullptr if no such partial specialization exists.
ClassTemplatePartialSpecializationDecl *findPartialSpecialization(QualType T);

/// Find a class template partial specialization which was instantiated
/// from the given member partial specialization.
///
/// \param D a member class template partial specialization.
///
/// \returns the class template partial specialization which was instantiated
/// from the given member partial specialization, or nullptr if no such
/// partial specialization exists.
ClassTemplatePartialSpecializationDecl *
findPartialSpecInstantiatedFromMember(
                                   ClassTemplatePartialSpecializationDecl *D);

/// Retrieve the template specialization type of the
/// injected-class-name for this class template.
///
/// The injected-class-name for a class template \c X is \c
/// X<template-args>, where \c template-args is formed from the
/// template arguments that correspond to the template parameters of
/// \c X. For example:
///
/// \code
/// template<typename T, int N>
/// struct array {
///   typedef array this_type; // "array" is equivalent to "array<T, N>"
/// };
/// \endcode
QualType getInjectedClassNameSpecialization();

using spec_iterator = SpecIterator<ClassTemplateSpecializationDecl>;
using spec_range = llvm::iterator_range<spec_iterator>;

spec_range specializations() const {
  return spec_range(spec_begin(), spec_end());
}

spec_iterator spec_begin() const {
  return makeSpecIterator(getSpecializations(), false);
}

spec_iterator spec_end() const {
  return makeSpecIterator(getSpecializations(), true);
}

// Implement isa/cast/dyncast support
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == ClassTemplate; }
2234};

2236/// Declaration of a friend template.
2237///
2238/// For example:
2239/// \code
2240/// template \<typename T> class A {
2241///   friend class MyVector<T>; // not a friend template
2242///   template \<typename U> friend class B; // not a friend template
2243///   template \<typename U> friend class Foo<T>::Nested; // friend template
2244/// };
2245/// \endcode
2246///
2247/// \note This class is not currently in use.  All of the above
2248/// will yield a FriendDecl, not a FriendTemplateDecl.
2249class FriendTemplateDecl : public Decl {
virtual void anchor();

2252public:
using FriendUnion = llvm::PointerUnion<NamedDecl *,TypeSourceInfo *>;

2255private:
// The number of template parameters;  always non-zero.
unsigned NumParams = 0;

// The parameter list.
TemplateParameterList **Params = nullptr;

// The declaration that's a friend of this class.
FriendUnion Friend;

// Location of the 'friend' specifier.
SourceLocation FriendLoc;

FriendTemplateDecl(DeclContext *DC, SourceLocation Loc,
                   MutableArrayRef<TemplateParameterList *> Params,
                   FriendUnion Friend, SourceLocation FriendLoc)
    : Decl(Decl::FriendTemplate, DC, Loc), NumParams(Params.size()),
      Params(Params.data()), Friend(Friend), FriendLoc(FriendLoc) {}

FriendTemplateDecl(EmptyShell Empty) : Decl(Decl::FriendTemplate, Empty) {}

2276public:
friend class ASTDeclReader;

static FriendTemplateDecl *
Create(ASTContext &Context, DeclContext *DC, SourceLocation Loc,
       MutableArrayRef<TemplateParameterList *> Params, FriendUnion Friend,
       SourceLocation FriendLoc);

static FriendTemplateDecl *CreateDeserialized(ASTContext &C, unsigned ID);

/// If this friend declaration names a templated type (or
/// a dependent member type of a templated type), return that
/// type;  otherwise return null.
TypeSourceInfo *getFriendType() const {
  return Friend.dyn_cast<TypeSourceInfo*>();
}

/// If this friend declaration names a templated function (or
/// a member function of a templated type), return that type;
/// otherwise return null.
NamedDecl *getFriendDecl() const {
  return Friend.dyn_cast<NamedDecl*>();
}

/// Retrieves the location of the 'friend' keyword.
SourceLocation getFriendLoc() const {
  return FriendLoc;
}

TemplateParameterList *getTemplateParameterList(unsigned i) const {
  assert(i <= NumParams)(static_cast <bool> (i <= NumParams) ? void (0) : __assert_fail
 ("i <= NumParams", "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 2306, __extension__ __PRETTY_FUNCTION__));
  return Params[i];
}

unsigned getNumTemplateParameters() const {
  return NumParams;
}

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == Decl::FriendTemplate; }
2317};

2319/// Declaration of an alias template.
2320///
2321/// For example:
2322/// \code
2323/// template \<typename T> using V = std::map<T*, int, MyCompare<T>>;
2324/// \endcode
2325class TypeAliasTemplateDecl : public RedeclarableTemplateDecl {
2326protected:
using Common = CommonBase;

TypeAliasTemplateDecl(ASTContext &C, DeclContext *DC, SourceLocation L,
                      DeclarationName Name, TemplateParameterList *Params,
                      NamedDecl *Decl)
    : RedeclarableTemplateDecl(TypeAliasTemplate, C, DC, L, Name, Params,
                               Decl) {}

CommonBase *newCommon(ASTContext &C) const override;

Common *getCommonPtr() {
  return static_cast<Common *>(RedeclarableTemplateDecl::getCommonPtr());
}

2341public:
friend class ASTDeclReader;
friend class ASTDeclWriter;

/// Get the underlying function declaration of the template.
TypeAliasDecl *getTemplatedDecl() const {
  return static_cast<TypeAliasDecl *>(TemplatedDecl);
}


TypeAliasTemplateDecl *getCanonicalDecl() override {
  return cast<TypeAliasTemplateDecl>(
           RedeclarableTemplateDecl::getCanonicalDecl());
}
const TypeAliasTemplateDecl *getCanonicalDecl() const {
  return cast<TypeAliasTemplateDecl>(
           RedeclarableTemplateDecl::getCanonicalDecl());
}

/// Retrieve the previous declaration of this function template, or
/// nullptr if no such declaration exists.
TypeAliasTemplateDecl *getPreviousDecl() {
  return cast_or_null<TypeAliasTemplateDecl>(
           static_cast<RedeclarableTemplateDecl *>(this)->getPreviousDecl());
}
const TypeAliasTemplateDecl *getPreviousDecl() const {
  return cast_or_null<TypeAliasTemplateDecl>(
           static_cast<const RedeclarableTemplateDecl *>(
             this)->getPreviousDecl());
}

TypeAliasTemplateDecl *getInstantiatedFromMemberTemplate() const {
  return cast_or_null<TypeAliasTemplateDecl>(
           RedeclarableTemplateDecl::getInstantiatedFromMemberTemplate());
}

/// Create a function template node.
static TypeAliasTemplateDecl *Create(ASTContext &C, DeclContext *DC,
                                     SourceLocation L,
                                     DeclarationName Name,
                                     TemplateParameterList *Params,
                                     NamedDecl *Decl);

/// Create an empty alias template node.
static TypeAliasTemplateDecl *CreateDeserialized(ASTContext &C, unsigned ID);

// Implement isa/cast/dyncast support
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == TypeAliasTemplate; }
2390};

2392/// Declaration of a function specialization at template class scope.
2393///
2394/// This is a non-standard extension needed to support MSVC.
2395///
2396/// For example:
2397/// \code
2398/// template <class T>
2399/// class A {
2400///    template <class U> void foo(U a) { }
2401///    template<> void foo(int a) { }
2402/// }
2403/// \endcode
2404///
2405/// "template<> foo(int a)" will be saved in Specialization as a normal
2406/// CXXMethodDecl. Then during an instantiation of class A, it will be
2407/// transformed into an actual function specialization.
2408class ClassScopeFunctionSpecializationDecl : public Decl {
CXXMethodDecl *Specialization;
bool HasExplicitTemplateArgs;
TemplateArgumentListInfo TemplateArgs;

ClassScopeFunctionSpecializationDecl(DeclContext *DC, SourceLocation Loc,
                                     CXXMethodDecl *FD, bool Args,
                                     TemplateArgumentListInfo TemplArgs)
    : Decl(Decl::ClassScopeFunctionSpecialization, DC, Loc),
      Specialization(FD), HasExplicitTemplateArgs(Args),
      TemplateArgs(std::move(TemplArgs)) {}

ClassScopeFunctionSpecializationDecl(EmptyShell Empty)
    : Decl(Decl::ClassScopeFunctionSpecialization, Empty) {}

virtual void anchor();

2425public:
friend class ASTDeclReader;
friend class ASTDeclWriter;

CXXMethodDecl *getSpecialization() const { return Specialization; }
bool hasExplicitTemplateArgs() const { return HasExplicitTemplateArgs; }
const TemplateArgumentListInfo& templateArgs() const { return TemplateArgs; }

static ClassScopeFunctionSpecializationDecl *Create(ASTContext &C,
                                                    DeclContext *DC,
                                                    SourceLocation Loc,
                                                    CXXMethodDecl *FD,
                                                 bool HasExplicitTemplateArgs,
                                      TemplateArgumentListInfo TemplateArgs) {
  return new (C, DC) ClassScopeFunctionSpecializationDecl(
      DC, Loc, FD, HasExplicitTemplateArgs, std::move(TemplateArgs));
}

static ClassScopeFunctionSpecializationDecl *
CreateDeserialized(ASTContext &Context, unsigned ID);

// Implement isa/cast/dyncast/etc.
static bool classof(const Decl *D) { return classofKind(D->getKind()); }

static bool classofKind(Kind K) {
  return K == Decl::ClassScopeFunctionSpecialization;
}
2452};

2454/// Implementation of inline functions that require the template declarations
2455inline AnyFunctionDecl::AnyFunctionDecl(FunctionTemplateDecl *FTD)
  : Function(FTD) {}

2458/// Represents a variable template specialization, which refers to
2459/// a variable template with a given set of template arguments.
2460///
2461/// Variable template specializations represent both explicit
2462/// specializations of variable templates, as in the example below, and
2463/// implicit instantiations of variable templates.
2464///
2465/// \code
2466/// template<typename T> constexpr T pi = T(3.1415926535897932385);
2467///
2468/// template<>
2469/// constexpr float pi<float>; // variable template specialization pi<float>
2470/// \endcode
2471class VarTemplateSpecializationDecl : public VarDecl,
                                    public llvm::FoldingSetNode {

/// Structure that stores information about a variable template
/// specialization that was instantiated from a variable template partial
/// specialization.
struct SpecializedPartialSpecialization {
  /// The variable template partial specialization from which this
  /// variable template specialization was instantiated.
  VarTemplatePartialSpecializationDecl *PartialSpecialization;

  /// The template argument list deduced for the variable template
  /// partial specialization itself.
  const TemplateArgumentList *TemplateArgs;
};

/// The template that this specialization specializes.
llvm::PointerUnion<VarTemplateDecl *, SpecializedPartialSpecialization *>
SpecializedTemplate;

/// Further info for explicit template specialization/instantiation.
struct ExplicitSpecializationInfo {
  /// The type-as-written.
  TypeSourceInfo *TypeAsWritten = nullptr;

  /// The location of the extern keyword.
  SourceLocation ExternLoc;

  /// The location of the template keyword.
  SourceLocation TemplateKeywordLoc;

  ExplicitSpecializationInfo() = default;
};

/// Further info for explicit template specialization/instantiation.
/// Does not apply to implicit specializations.
ExplicitSpecializationInfo *ExplicitInfo = nullptr;

/// The template arguments used to describe this specialization.
const TemplateArgumentList *TemplateArgs;
TemplateArgumentListInfo TemplateArgsInfo;

/// The point where this template was instantiated (if any).
SourceLocation PointOfInstantiation;

/// The kind of specialization this declaration refers to.
/// Really a value of type TemplateSpecializationKind.
unsigned SpecializationKind : 3;

/// Whether this declaration is a complete definition of the
/// variable template specialization. We can't otherwise tell apart
/// an instantiated declaration from an instantiated definition with
/// no initializer.
unsigned IsCompleteDefinition : 1;

2526protected:
VarTemplateSpecializationDecl(Kind DK, ASTContext &Context, DeclContext *DC,
                              SourceLocation StartLoc, SourceLocation IdLoc,
                              VarTemplateDecl *SpecializedTemplate,
                              QualType T, TypeSourceInfo *TInfo,
                              StorageClass S,
                              ArrayRef<TemplateArgument> Args);

explicit VarTemplateSpecializationDecl(Kind DK, ASTContext &Context);

2536public:
friend class ASTDeclReader;
friend class ASTDeclWriter;
friend class VarDecl;

static VarTemplateSpecializationDecl *
Create(ASTContext &Context, DeclContext *DC, SourceLocation StartLoc,
       SourceLocation IdLoc, VarTemplateDecl *SpecializedTemplate, QualType T,
       TypeSourceInfo *TInfo, StorageClass S,
       ArrayRef<TemplateArgument> Args);
static VarTemplateSpecializationDecl *CreateDeserialized(ASTContext &C,
                                                         unsigned ID);

void getNameForDiagnostic(raw_ostream &OS, const PrintingPolicy &Policy,
                          bool Qualified) const override;

VarTemplateSpecializationDecl *getMostRecentDecl() {
  VarDecl *Recent = static_cast<VarDecl *>(this)->getMostRecentDecl();
  return cast<VarTemplateSpecializationDecl>(Recent);
}

/// Retrieve the template that this specialization specializes.
VarTemplateDecl *getSpecializedTemplate() const;

/// Retrieve the template arguments of the variable template
/// specialization.
const TemplateArgumentList &getTemplateArgs() const { return *TemplateArgs; }

// TODO: Always set this when creating the new specialization?
void setTemplateArgsInfo(const TemplateArgumentListInfo &ArgsInfo);

const TemplateArgumentListInfo &getTemplateArgsInfo() const {
  return TemplateArgsInfo;
}

/// Determine the kind of specialization that this
/// declaration represents.
TemplateSpecializationKind getSpecializationKind() const {
  return static_cast<TemplateSpecializationKind>(SpecializationKind);
}

bool isExplicitSpecialization() const {
  return getSpecializationKind() == TSK_ExplicitSpecialization;
}

/// True if this declaration is an explicit specialization,
/// explicit instantiation declaration, or explicit instantiation
/// definition.
bool isExplicitInstantiationOrSpecialization() const {
  return isTemplateExplicitInstantiationOrSpecialization(
      getTemplateSpecializationKind());
}

void setSpecializationKind(TemplateSpecializationKind TSK) {
  SpecializationKind = TSK;
}

/// Get the point of instantiation (if any), or null if none.
SourceLocation getPointOfInstantiation() const {
  return PointOfInstantiation;
}

void setPointOfInstantiation(SourceLocation Loc) {
  assert(Loc.isValid() && "point of instantiation must be valid!")(static_cast <bool> (Loc.isValid() && "point of instantiation must be valid!"
) ? void (0) : __assert_fail ("Loc.isValid() && \"point of instantiation must be valid!\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 2599, __extension__ __PRETTY_FUNCTION__));
  PointOfInstantiation = Loc;
}

void setCompleteDefinition() { IsCompleteDefinition = true; }

/// If this variable template specialization is an instantiation of
/// a template (rather than an explicit specialization), return the
/// variable template or variable template partial specialization from which
/// it was instantiated.
llvm::PointerUnion<VarTemplateDecl *, VarTemplatePartialSpecializationDecl *>
getInstantiatedFrom() const {
  if (!isTemplateInstantiation(getSpecializationKind()))
    return llvm::PointerUnion<VarTemplateDecl *,
                              VarTemplatePartialSpecializationDecl *>();

  return getSpecializedTemplateOrPartial();
}

/// Retrieve the variable template or variable template partial
/// specialization which was specialized by this.
llvm::PointerUnion<VarTemplateDecl *, VarTemplatePartialSpecializationDecl *>
getSpecializedTemplateOrPartial() const {
  if (const auto *PartialSpec =
          SpecializedTemplate.dyn_cast<SpecializedPartialSpecialization *>())
    return PartialSpec->PartialSpecialization;

  return SpecializedTemplate.get<VarTemplateDecl *>();
}

/// Retrieve the set of template arguments that should be used
/// to instantiate the initializer of the variable template or variable
/// template partial specialization from which this variable template
/// specialization was instantiated.
///
/// \returns For a variable template specialization instantiated from the
/// primary template, this function will return the same template arguments
/// as getTemplateArgs(). For a variable template specialization instantiated
/// from a variable template partial specialization, this function will the
/// return deduced template arguments for the variable template partial
/// specialization itself.
const TemplateArgumentList &getTemplateInstantiationArgs() const {
  if (const auto *PartialSpec =
          SpecializedTemplate.dyn_cast<SpecializedPartialSpecialization *>())
    return *PartialSpec->TemplateArgs;

  return getTemplateArgs();
}

/// Note that this variable template specialization is actually an
/// instantiation of the given variable template partial specialization whose
/// template arguments have been deduced.
void setInstantiationOf(VarTemplatePartialSpecializationDecl *PartialSpec,
                        const TemplateArgumentList *TemplateArgs) {
  assert(!SpecializedTemplate.is<SpecializedPartialSpecialization *>() &&(static_cast <bool> (!SpecializedTemplate.is<SpecializedPartialSpecialization
 *>() && "Already set to a variable template partial specialization!"
) ? void (0) : __assert_fail ("!SpecializedTemplate.is<SpecializedPartialSpecialization *>() && \"Already set to a variable template partial specialization!\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 2654, __extension__ __PRETTY_FUNCTION__))
         "Already set to a variable template partial specialization!")(static_cast <bool> (!SpecializedTemplate.is<SpecializedPartialSpecialization
 *>() && "Already set to a variable template partial specialization!"
) ? void (0) : __assert_fail ("!SpecializedTemplate.is<SpecializedPartialSpecialization *>() && \"Already set to a variable template partial specialization!\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 2654, __extension__ __PRETTY_FUNCTION__));
  auto *PS = new (getASTContext()) SpecializedPartialSpecialization();
  PS->PartialSpecialization = PartialSpec;
  PS->TemplateArgs = TemplateArgs;
  SpecializedTemplate = PS;
}

/// Note that this variable template specialization is an instantiation
/// of the given variable template.
void setInstantiationOf(VarTemplateDecl *TemplDecl) {
  assert(!SpecializedTemplate.is<SpecializedPartialSpecialization *>() &&(static_cast <bool> (!SpecializedTemplate.is<SpecializedPartialSpecialization
 *>() && "Previously set to a variable template partial specialization!"
) ? void (0) : __assert_fail ("!SpecializedTemplate.is<SpecializedPartialSpecialization *>() && \"Previously set to a variable template partial specialization!\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 2665, __extension__ __PRETTY_FUNCTION__))
         "Previously set to a variable template partial specialization!")(static_cast <bool> (!SpecializedTemplate.is<SpecializedPartialSpecialization
 *>() && "Previously set to a variable template partial specialization!"
) ? void (0) : __assert_fail ("!SpecializedTemplate.is<SpecializedPartialSpecialization *>() && \"Previously set to a variable template partial specialization!\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 2665, __extension__ __PRETTY_FUNCTION__));
  SpecializedTemplate = TemplDecl;
}

/// Sets the type of this specialization as it was written by
/// the user.
void setTypeAsWritten(TypeSourceInfo *T) {
  if (!ExplicitInfo)
    ExplicitInfo = new (getASTContext()) ExplicitSpecializationInfo;
  ExplicitInfo->TypeAsWritten = T;
}

/// Gets the type of this specialization as it was written by
/// the user, if it was so written.
TypeSourceInfo *getTypeAsWritten() const {
  return ExplicitInfo ? ExplicitInfo->TypeAsWritten : nullptr;
}

/// Gets the location of the extern keyword, if present.
SourceLocation getExternLoc() const {
  return ExplicitInfo ? ExplicitInfo->ExternLoc : SourceLocation();
}

/// Sets the location of the extern keyword.
void setExternLoc(SourceLocation Loc) {
  if (!ExplicitInfo)
    ExplicitInfo = new (getASTContext()) ExplicitSpecializationInfo;
  ExplicitInfo->ExternLoc = Loc;
}

/// Sets the location of the template keyword.
void setTemplateKeywordLoc(SourceLocation Loc) {
  if (!ExplicitInfo)
    ExplicitInfo = new (getASTContext()) ExplicitSpecializationInfo;
  ExplicitInfo->TemplateKeywordLoc = Loc;
}

/// Gets the location of the template keyword, if present.
SourceLocation getTemplateKeywordLoc() const {
  return ExplicitInfo ? ExplicitInfo->TemplateKeywordLoc : SourceLocation();
}

void Profile(llvm::FoldingSetNodeID &ID) const {
  Profile(ID, TemplateArgs->asArray(), getASTContext());
}

static void Profile(llvm::FoldingSetNodeID &ID,
                    ArrayRef<TemplateArgument> TemplateArgs,
                    ASTContext &Context) {
  ID.AddInteger(TemplateArgs.size());
  for (const TemplateArgument &TemplateArg : TemplateArgs)
    TemplateArg.Profile(ID, Context);
}

static bool classof(const Decl *D) { return classofKind(D->getKind()); }

static bool classofKind(Kind K) {
  return K >= firstVarTemplateSpecialization &&
         K <= lastVarTemplateSpecialization;
}
2725};

2727class VarTemplatePartialSpecializationDecl
  : public VarTemplateSpecializationDecl {
/// The list of template parameters
TemplateParameterList *TemplateParams = nullptr;

/// The source info for the template arguments as written.
/// FIXME: redundant with TypeAsWritten?
const ASTTemplateArgumentListInfo *ArgsAsWritten = nullptr;

/// The variable template partial specialization from which this
/// variable template partial specialization was instantiated.
///
/// The boolean value will be true to indicate that this variable template
/// partial specialization was specialized at this level.
llvm::PointerIntPair<VarTemplatePartialSpecializationDecl *, 1, bool>
InstantiatedFromMember;

VarTemplatePartialSpecializationDecl(
    ASTContext &Context, DeclContext *DC, SourceLocation StartLoc,
    SourceLocation IdLoc, TemplateParameterList *Params,
    VarTemplateDecl *SpecializedTemplate, QualType T, TypeSourceInfo *TInfo,
    StorageClass S, ArrayRef<TemplateArgument> Args,
    const ASTTemplateArgumentListInfo *ArgInfos);

VarTemplatePartialSpecializationDecl(ASTContext &Context)
    : VarTemplateSpecializationDecl(VarTemplatePartialSpecialization,
                                    Context),
      InstantiatedFromMember(nullptr, false) {}

void anchor() override;

2758public:
friend class ASTDeclReader;
friend class ASTDeclWriter;

static VarTemplatePartialSpecializationDecl *
Create(ASTContext &Context, DeclContext *DC, SourceLocation StartLoc,
       SourceLocation IdLoc, TemplateParameterList *Params,
       VarTemplateDecl *SpecializedTemplate, QualType T,
       TypeSourceInfo *TInfo, StorageClass S, ArrayRef<TemplateArgument> Args,
       const TemplateArgumentListInfo &ArgInfos);

static VarTemplatePartialSpecializationDecl *CreateDeserialized(ASTContext &C,
                                                                unsigned ID);

VarTemplatePartialSpecializationDecl *getMostRecentDecl() {
  return cast<VarTemplatePartialSpecializationDecl>(
           static_cast<VarTemplateSpecializationDecl *>(
             this)->getMostRecentDecl());
}

/// Get the list of template parameters
TemplateParameterList *getTemplateParameters() const {
  return TemplateParams;
}

/// Get the template arguments as written.
const ASTTemplateArgumentListInfo *getTemplateArgsAsWritten() const {
  return ArgsAsWritten;
}

/// Retrieve the member variable template partial specialization from
/// which this particular variable template partial specialization was
/// instantiated.
///
/// \code
/// template<typename T>
/// struct Outer {
///   template<typename U> U Inner;
///   template<typename U> U* Inner<U*> = (U*)(0); // #1
/// };
///
/// template int* Outer<float>::Inner<int*>;
/// \endcode
///
/// In this example, the instantiation of \c Outer<float>::Inner<int*> will
/// end up instantiating the partial specialization
/// \c Outer<float>::Inner<U*>, which itself was instantiated from the
/// variable template partial specialization \c Outer<T>::Inner<U*>. Given
/// \c Outer<float>::Inner<U*>, this function would return
/// \c Outer<T>::Inner<U*>.
VarTemplatePartialSpecializationDecl *getInstantiatedFromMember() const {
  const auto *First =
      cast<VarTemplatePartialSpecializationDecl>(getFirstDecl());
  return First->InstantiatedFromMember.getPointer();
}

void
setInstantiatedFromMember(VarTemplatePartialSpecializationDecl *PartialSpec) {
  auto *First = cast<VarTemplatePartialSpecializationDecl>(getFirstDecl());
  First->InstantiatedFromMember.setPointer(PartialSpec);
}

/// Determines whether this variable template partial specialization
/// was a specialization of a member partial specialization.
///
/// In the following example, the member template partial specialization
/// \c X<int>::Inner<T*> is a member specialization.
///
/// \code
/// template<typename T>
/// struct X {
///   template<typename U> U Inner;
///   template<typename U> U* Inner<U*> = (U*)(0);
/// };
///
/// template<> template<typename T>
/// U* X<int>::Inner<T*> = (T*)(0) + 1;
/// \endcode
bool isMemberSpecialization() {
  const auto *First =
      cast<VarTemplatePartialSpecializationDecl>(getFirstDecl());
  return First->InstantiatedFromMember.getInt();
}

/// Note that this member template is a specialization.
void setMemberSpecialization() {
  auto *First = cast<VarTemplatePartialSpecializationDecl>(getFirstDecl());
  assert(First->InstantiatedFromMember.getPointer() &&(static_cast <bool> (First->InstantiatedFromMember.getPointer
() && "Only member templates can be member template specializations"
) ? void (0) : __assert_fail ("First->InstantiatedFromMember.getPointer() && \"Only member templates can be member template specializations\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 2846, __extension__ __PRETTY_FUNCTION__))
         "Only member templates can be member template specializations")(static_cast <bool> (First->InstantiatedFromMember.getPointer
() && "Only member templates can be member template specializations"
) ? void (0) : __assert_fail ("First->InstantiatedFromMember.getPointer() && \"Only member templates can be member template specializations\""
, "/build/llvm-toolchain-snapshot-7~svn337204/tools/clang/include/clang/AST/DeclTemplate.h"
, 2846, __extension__ __PRETTY_FUNCTION__));
  return First->InstantiatedFromMember.setInt(true);
}

static bool classof(const Decl *D) { return classofKind(D->getKind()); }

static bool classofKind(Kind K) {
  return K == VarTemplatePartialSpecialization;
}
2855};

2857/// Declaration of a variable template.
2858class VarTemplateDecl : public RedeclarableTemplateDecl {
2859protected:
/// Data that is common to all of the declarations of a given
/// variable template.
struct Common : CommonBase {
  /// The variable template specializations for this variable
  /// template, including explicit specializations and instantiations.
  llvm::FoldingSetVector<VarTemplateSpecializationDecl> Specializations;

  /// The variable template partial specializations for this variable
  /// template.
  llvm::FoldingSetVector<VarTemplatePartialSpecializationDecl>
  PartialSpecializations;

  Common() = default;
};

/// Retrieve the set of specializations of this variable template.
llvm::FoldingSetVector<VarTemplateSpecializationDecl> &
getSpecializations() const;

/// Retrieve the set of partial specializations of this class
/// template.
llvm::FoldingSetVector<VarTemplatePartialSpecializationDecl> &
getPartialSpecializations();

VarTemplateDecl(ASTContext &C, DeclContext *DC, SourceLocation L,
                DeclarationName Name, TemplateParameterList *Params,
                NamedDecl *Decl)
    : RedeclarableTemplateDecl(VarTemplate, C, DC, L, Name, Params, Decl) {}

CommonBase *newCommon(ASTContext &C) const override;

Common *getCommonPtr() const {
  return static_cast<Common *>(RedeclarableTemplateDecl::getCommonPtr());
}

2895public:
friend class ASTDeclReader;
friend class ASTDeclWriter;

/// Load any lazily-loaded specializations from the external source.
void LoadLazySpecializations() const;

/// Get the underlying variable declarations of the template.
VarDecl *getTemplatedDecl() const {
  return static_cast<VarDecl *>(TemplatedDecl);
}

/// Returns whether this template declaration defines the primary
/// variable pattern.
bool isThisDeclarationADefinition() const {
  return getTemplatedDecl()->isThisDeclarationADefinition();
}

VarTemplateDecl *getDefinition();

/// Create a variable template node.
static VarTemplateDecl *Create(ASTContext &C, DeclContext *DC,
                               SourceLocation L, DeclarationName Name,
                               TemplateParameterList *Params,
                               VarDecl *Decl);

/// Create an empty variable template node.
static VarTemplateDecl *CreateDeserialized(ASTContext &C, unsigned ID);

/// Return the specialization with the provided arguments if it exists,
/// otherwise return the insertion point.
VarTemplateSpecializationDecl *
findSpecialization(ArrayRef<TemplateArgument> Args, void *&InsertPos);

/// Insert the specified specialization knowing that it is not already
/// in. InsertPos must be obtained from findSpecialization.
void AddSpecialization(VarTemplateSpecializationDecl *D, void *InsertPos);

VarTemplateDecl *getCanonicalDecl() override {
  return cast<VarTemplateDecl>(RedeclarableTemplateDecl::getCanonicalDecl());
}
const VarTemplateDecl *getCanonicalDecl() const {
  return cast<VarTemplateDecl>(RedeclarableTemplateDecl::getCanonicalDecl());
}

/// Retrieve the previous declaration of this variable template, or
/// nullptr if no such declaration exists.
VarTemplateDecl *getPreviousDecl() {
  return cast_or_null<VarTemplateDecl>(
      static_cast<RedeclarableTemplateDecl *>(this)->getPreviousDecl());
}
const VarTemplateDecl *getPreviousDecl() const {
  return cast_or_null<VarTemplateDecl>(
          static_cast<const RedeclarableTemplateDecl *>(
            this)->getPreviousDecl());
}

VarTemplateDecl *getMostRecentDecl() {
  return cast<VarTemplateDecl>(
      static_cast<RedeclarableTemplateDecl *>(this)->getMostRecentDecl());
}
const VarTemplateDecl *getMostRecentDecl() const {
  return const_cast<VarTemplateDecl *>(this)->getMostRecentDecl();
}

VarTemplateDecl *getInstantiatedFromMemberTemplate() const {
  return cast_or_null<VarTemplateDecl>(
      RedeclarableTemplateDecl::getInstantiatedFromMemberTemplate());
}

/// Return the partial specialization with the provided arguments if it
/// exists, otherwise return the insertion point.
VarTemplatePartialSpecializationDecl *
findPartialSpecialization(ArrayRef<TemplateArgument> Args, void *&InsertPos);

/// Insert the specified partial specialization knowing that it is not
/// already in. InsertPos must be obtained from findPartialSpecialization.
void AddPartialSpecialization(VarTemplatePartialSpecializationDecl *D,
                              void *InsertPos);

/// Retrieve the partial specializations as an ordered list.
void getPartialSpecializations(
    SmallVectorImpl<VarTemplatePartialSpecializationDecl *> &PS);

/// Find a variable template partial specialization which was
/// instantiated
/// from the given member partial specialization.
///
/// \param D a member variable template partial specialization.
///
/// \returns the variable template partial specialization which was
/// instantiated
/// from the given member partial specialization, or nullptr if no such
/// partial specialization exists.
VarTemplatePartialSpecializationDecl *findPartialSpecInstantiatedFromMember(
    VarTemplatePartialSpecializationDecl *D);

using spec_iterator = SpecIterator<VarTemplateSpecializationDecl>;
using spec_range = llvm::iterator_range<spec_iterator>;

spec_range specializations() const {
  return spec_range(spec_begin(), spec_end());
}

spec_iterator spec_begin() const {
  return makeSpecIterator(getSpecializations(), false);
}

spec_iterator spec_end() const {
  return makeSpecIterator(getSpecializations(), true);
}

// Implement isa/cast/dyncast support
static bool classof(const Decl *D) { return classofKind(D->getKind()); }
static bool classofKind(Kind K) { return K == VarTemplate; }
3010};

3012inline NamedDecl *getAsNamedDecl(TemplateParameter P) {
if (auto *PD = P.dyn_cast<TemplateTypeParmDecl *>())
  return PD;
if (auto *PD = P.dyn_cast<NonTypeTemplateParmDecl *>())
  return PD;
return P.get<TemplateTemplateParmDecl *>();
3018}

3020inline TemplateDecl *getAsTypeTemplateDecl(Decl *D) {
auto *TD = dyn_cast<TemplateDecl>(D);
return TD && (isa<ClassTemplateDecl>(TD) ||
              isa<ClassTemplatePartialSpecializationDecl>(TD) ||
              isa<TypeAliasTemplateDecl>(TD) ||
              isa<TemplateTemplateParmDecl>(TD))
           ? TD
           : nullptr;
3028}

3030} // namespace clang

3032#endif // LLVM_CLANG_AST_DECLTEMPLATE_H