/usr/src/gnu/usr.bin/clang/libclangAST/../../../llvm/clang/lib/AST/ASTImporter.cpp

Bug Summary

File:	src/gnu/usr.bin/clang/libclangAST/../../../llvm/clang/lib/AST/ASTImporter.cpp
Warning:	line 4419, column 7 Called C++ object pointer is uninitialized

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name ASTImporter.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -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 -setup-static-analyzer -mrelocation-model static -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/gnu/usr.bin/clang/libclangAST/obj -resource-dir /usr/local/lib/clang/13.0.0 -I /usr/src/gnu/usr.bin/clang/libclangAST/obj/../include/clang/AST -I /usr/src/gnu/usr.bin/clang/libclangAST/../../../llvm/clang/include -I /usr/src/gnu/usr.bin/clang/libclangAST/../../../llvm/llvm/include -I /usr/src/gnu/usr.bin/clang/libclangAST/../include -I /usr/src/gnu/usr.bin/clang/libclangAST/obj -I /usr/src/gnu/usr.bin/clang/libclangAST/obj/../include -D NDEBUG -D __STDC_LIMIT_MACROS -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D LLVM_PREFIX="/usr" -internal-isystem /usr/include/c++/v1 -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-comment -std=c++14 -fdeprecated-macro -fdebug-compilation-dir=/usr/src/gnu/usr.bin/clang/libclangAST/obj -ferror-limit 19 -fvisibility-inlines-hidden -fwrapv -stack-protector 2 -fno-rtti -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c++ /usr/src/gnu/usr.bin/clang/libclangAST/../../../llvm/clang/lib/AST/ASTImporter.cpp

/usr/src/gnu/usr.bin/clang/libclangAST/../../../llvm/clang/lib/AST/ASTImporter.cpp

→

1//===- ASTImporter.cpp - Importing ASTs from other Contexts ---------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9//  This file defines the ASTImporter class which imports AST nodes from one
10//  context into another context.
11//
12//===----------------------------------------------------------------------===//

14#include "clang/AST/ASTImporter.h"
15#include "clang/AST/ASTImporterSharedState.h"
16#include "clang/AST/ASTContext.h"
17#include "clang/AST/ASTDiagnostic.h"
18#include "clang/AST/ASTStructuralEquivalence.h"
19#include "clang/AST/Attr.h"
20#include "clang/AST/Decl.h"
21#include "clang/AST/DeclAccessPair.h"
22#include "clang/AST/DeclBase.h"
23#include "clang/AST/DeclCXX.h"
24#include "clang/AST/DeclFriend.h"
25#include "clang/AST/DeclGroup.h"
26#include "clang/AST/DeclObjC.h"
27#include "clang/AST/DeclTemplate.h"
28#include "clang/AST/DeclVisitor.h"
29#include "clang/AST/DeclarationName.h"
30#include "clang/AST/Expr.h"
31#include "clang/AST/ExprCXX.h"
32#include "clang/AST/ExprObjC.h"
33#include "clang/AST/ExternalASTSource.h"
34#include "clang/AST/LambdaCapture.h"
35#include "clang/AST/NestedNameSpecifier.h"
36#include "clang/AST/OperationKinds.h"
37#include "clang/AST/Stmt.h"
38#include "clang/AST/StmtCXX.h"
39#include "clang/AST/StmtObjC.h"
40#include "clang/AST/StmtVisitor.h"
41#include "clang/AST/TemplateBase.h"
42#include "clang/AST/TemplateName.h"
43#include "clang/AST/Type.h"
44#include "clang/AST/TypeLoc.h"
45#include "clang/AST/TypeVisitor.h"
46#include "clang/AST/UnresolvedSet.h"
47#include "clang/Basic/Builtins.h"
48#include "clang/Basic/ExceptionSpecificationType.h"
49#include "clang/Basic/FileManager.h"
50#include "clang/Basic/IdentifierTable.h"
51#include "clang/Basic/LLVM.h"
52#include "clang/Basic/LangOptions.h"
53#include "clang/Basic/SourceLocation.h"
54#include "clang/Basic/SourceManager.h"
55#include "clang/Basic/Specifiers.h"
56#include "llvm/ADT/APSInt.h"
57#include "llvm/ADT/ArrayRef.h"
58#include "llvm/ADT/DenseMap.h"
59#include "llvm/ADT/None.h"
60#include "llvm/ADT/Optional.h"
61#include "llvm/ADT/ScopeExit.h"
62#include "llvm/ADT/STLExtras.h"
63#include "llvm/ADT/SmallVector.h"
64#include "llvm/Support/Casting.h"
65#include "llvm/Support/ErrorHandling.h"
66#include "llvm/Support/MemoryBuffer.h"
67#include <algorithm>
68#include <cassert>
69#include <cstddef>
70#include <memory>
71#include <type_traits>
72#include <utility>

74namespace clang {

using llvm::make_error;
using llvm::Error;
using llvm::Expected;
using ExpectedType = llvm::Expected<QualType>;
using ExpectedStmt = llvm::Expected<Stmt *>;
using ExpectedExpr = llvm::Expected<Expr *>;
using ExpectedDecl = llvm::Expected<Decl *>;
using ExpectedSLoc = llvm::Expected<SourceLocation>;
using ExpectedName = llvm::Expected<DeclarationName>;

std::string ImportError::toString() const {
  // FIXME: Improve error texts.
  switch (Error) {
  case NameConflict:
    return "NameConflict";
  case UnsupportedConstruct:
    return "UnsupportedConstruct";
  case Unknown:
    return "Unknown error";
  }
  llvm_unreachable("Invalid error code.")__builtin_unreachable();
  return "Invalid error code.";
}

void ImportError::log(raw_ostream &OS) const {
  OS << toString();
}

std::error_code ImportError::convertToErrorCode() const {
  llvm_unreachable("Function not implemented.")__builtin_unreachable();
}

char ImportError::ID;

template <class T>
SmallVector<Decl *, 2>
getCanonicalForwardRedeclChain(Redeclarable<T>* D) {
  SmallVector<Decl *, 2> Redecls;
  for (auto *R : D->getFirstDecl()->redecls()) {
    if (R != D->getFirstDecl())
      Redecls.push_back(R);
  }
  Redecls.push_back(D->getFirstDecl());
  std::reverse(Redecls.begin(), Redecls.end());
  return Redecls;
}

SmallVector<Decl*, 2> getCanonicalForwardRedeclChain(Decl* D) {
  if (auto *FD = dyn_cast<FunctionDecl>(D))
    return getCanonicalForwardRedeclChain<FunctionDecl>(FD);
  if (auto *VD = dyn_cast<VarDecl>(D))
    return getCanonicalForwardRedeclChain<VarDecl>(VD);
  if (auto *TD = dyn_cast<TagDecl>(D))
    return getCanonicalForwardRedeclChain<TagDecl>(TD);
  llvm_unreachable("Bad declaration kind")__builtin_unreachable();
}

void updateFlags(const Decl *From, Decl *To) {
  // Check if some flags or attrs are new in 'From' and copy into 'To'.
  // FIXME: Other flags or attrs?
  if (From->isUsed(false) && !To->isUsed(false))
    To->setIsUsed();
}

class ASTNodeImporter : public TypeVisitor<ASTNodeImporter, ExpectedType>,
                        public DeclVisitor<ASTNodeImporter, ExpectedDecl>,
                        public StmtVisitor<ASTNodeImporter, ExpectedStmt> {
  ASTImporter &Importer;

  // Use this instead of Importer.importInto .
  template <typename ImportT>
  LLVM_NODISCARD[[clang::warn_unused_result]] Error importInto(ImportT &To, const ImportT &From) {
    return Importer.importInto(To, From);
  }

  // Use this to import pointers of specific type.
  template <typename ImportT>
  LLVM_NODISCARD[[clang::warn_unused_result]] Error importInto(ImportT *&To, ImportT *From) {
    auto ToOrErr = Importer.Import(From);
    if (ToOrErr)
20
←
Taking false branch→
      To = cast_or_null<ImportT>(*ToOrErr);
    return ToOrErr.takeError();
21
←
Returning without writing to 'To'→
  }

  // Call the import function of ASTImporter for a baseclass of type `T` and
  // cast the return value to `T`.
  template <typename T>
  Expected<T *> import(T *From) {
    auto ToOrErr = Importer.Import(From);
1
Calling 'ASTImporter::Import'→
    if (!ToOrErr)
      return ToOrErr.takeError();
    return cast_or_null<T>(*ToOrErr);
  }

  template <typename T>
  Expected<T *> import(const T *From) {
    return import(const_cast<T *>(From));
  }

  // Call the import function of ASTImporter for type `T`.
  template <typename T>
  Expected<T> import(const T &From) {
    return Importer.Import(From);
  }

  // Import an Optional<T> by importing the contained T, if any.
  template<typename T>
  Expected<Optional<T>> import(Optional<T> From) {
    if (!From)
      return Optional<T>();
    return import(*From);
  }

  // Helper for chaining together multiple imports. If an error is detected,
  // subsequent imports will return default constructed nodes, so that failure
  // can be detected with a single conditional branch after a sequence of
  // imports.
  template <typename T> T importChecked(Error &Err, const T &From) {
    // Don't attempt to import nodes if we hit an error earlier.
    if (Err)
      return T{};
    Expected<T> MaybeVal = import(From);
    if (!MaybeVal) {
      Err = MaybeVal.takeError();
      return T{};
    }
    return *MaybeVal;
  }

  ExplicitSpecifier importExplicitSpecifier(Error &Err,
                                            ExplicitSpecifier ESpec);

  // Wrapper for an overload set.
  template <typename ToDeclT> struct CallOverloadedCreateFun {
    template <typename... Args> decltype(auto) operator()(Args &&... args) {
      return ToDeclT::Create(std::forward<Args>(args)...);
    }
  };

  // Always use these functions to create a Decl during import. There are
  // certain tasks which must be done after the Decl was created, e.g. we
  // must immediately register that as an imported Decl.  The parameter `ToD`
  // will be set to the newly created Decl or if had been imported before
  // then to the already imported Decl.  Returns a bool value set to true if
  // the `FromD` had been imported before.
  template <typename ToDeclT, typename FromDeclT, typename... Args>
  LLVM_NODISCARD[[clang::warn_unused_result]] bool GetImportedOrCreateDecl(ToDeclT *&ToD, FromDeclT *FromD,
                                              Args &&... args) {
    // There may be several overloads of ToDeclT::Create. We must make sure
    // to call the one which would be chosen by the arguments, thus we use a
    // wrapper for the overload set.
    CallOverloadedCreateFun<ToDeclT> OC;
    return GetImportedOrCreateSpecialDecl(ToD, OC, FromD,
                                          std::forward<Args>(args)...);
  }
  // Use this overload if a special Type is needed to be created.  E.g if we
  // want to create a `TypeAliasDecl` and assign that to a `TypedefNameDecl`
  // then:
  // TypedefNameDecl *ToTypedef;
  // GetImportedOrCreateDecl<TypeAliasDecl>(ToTypedef, FromD, ...);
  template <typename NewDeclT, typename ToDeclT, typename FromDeclT,
            typename... Args>
  LLVM_NODISCARD[[clang::warn_unused_result]] bool GetImportedOrCreateDecl(ToDeclT *&ToD, FromDeclT *FromD,
                                              Args &&... args) {
    CallOverloadedCreateFun<NewDeclT> OC;
    return GetImportedOrCreateSpecialDecl(ToD, OC, FromD,
                                          std::forward<Args>(args)...);
  }
  // Use this version if a special create function must be
  // used, e.g. CXXRecordDecl::CreateLambda .
  template <typename ToDeclT, typename CreateFunT, typename FromDeclT,
            typename... Args>
  LLVM_NODISCARD[[clang::warn_unused_result]] bool
  GetImportedOrCreateSpecialDecl(ToDeclT *&ToD, CreateFunT CreateFun,
                                 FromDeclT *FromD, Args &&... args) {
    if (Importer.getImportDeclErrorIfAny(FromD)) {
      ToD = nullptr;
      return true; // Already imported but with error.
    }
    ToD = cast_or_null<ToDeclT>(Importer.GetAlreadyImportedOrNull(FromD));
    if (ToD)
      return true; // Already imported.
    ToD = CreateFun(std::forward<Args>(args)...);
    // Keep track of imported Decls.
    Importer.RegisterImportedDecl(FromD, ToD);
    InitializeImportedDecl(FromD, ToD);
    return false; // A new Decl is created.
  }

  void InitializeImportedDecl(Decl *FromD, Decl *ToD) {
    ToD->IdentifierNamespace = FromD->IdentifierNamespace;
    if (FromD->isUsed())
      ToD->setIsUsed();
    if (FromD->isImplicit())
      ToD->setImplicit();
  }

  // Check if we have found an existing definition.  Returns with that
  // definition if yes, otherwise returns null.
  Decl *FindAndMapDefinition(FunctionDecl *D, FunctionDecl *FoundFunction) {
    const FunctionDecl *Definition = nullptr;
    if (D->doesThisDeclarationHaveABody() &&
        FoundFunction->hasBody(Definition))
      return Importer.MapImported(D, const_cast<FunctionDecl *>(Definition));
    return nullptr;
  }

  void addDeclToContexts(Decl *FromD, Decl *ToD) {
    if (Importer.isMinimalImport()) {
      // In minimal import case the decl must be added even if it is not
      // contained in original context, for LLDB compatibility.
      // FIXME: Check if a better solution is possible.
      if (!FromD->getDescribedTemplate() &&
          FromD->getFriendObjectKind() == Decl::FOK_None)
        ToD->getLexicalDeclContext()->addDeclInternal(ToD);
      return;
    }

    DeclContext *FromDC = FromD->getDeclContext();
    DeclContext *FromLexicalDC = FromD->getLexicalDeclContext();
    DeclContext *ToDC = ToD->getDeclContext();
    DeclContext *ToLexicalDC = ToD->getLexicalDeclContext();

    bool Visible = false;
    if (FromDC->containsDeclAndLoad(FromD)) {
      ToDC->addDeclInternal(ToD);
      Visible = true;
    }
    if (ToDC != ToLexicalDC && FromLexicalDC->containsDeclAndLoad(FromD)) {
      ToLexicalDC->addDeclInternal(ToD);
      Visible = true;
    }

    // If the Decl was added to any context, it was made already visible.
    // Otherwise it is still possible that it should be visible.
    if (!Visible) {
      if (auto *FromNamed = dyn_cast<NamedDecl>(FromD)) {
        auto *ToNamed = cast<NamedDecl>(ToD);
        DeclContextLookupResult FromLookup =
            FromDC->lookup(FromNamed->getDeclName());
        for (NamedDecl *ND : FromLookup)
          if (ND == FromNamed) {
            ToDC->makeDeclVisibleInContext(ToNamed);
            break;
          }
      }
    }
  }

  void updateLookupTableForTemplateParameters(TemplateParameterList &Params,
                                              DeclContext *OldDC) {
    ASTImporterLookupTable *LT = Importer.SharedState->getLookupTable();
    if (!LT)
      return;

    for (NamedDecl *TP : Params)
      LT->update(TP, OldDC);
  }

  void updateLookupTableForTemplateParameters(TemplateParameterList &Params) {
    updateLookupTableForTemplateParameters(
        Params, Importer.getToContext().getTranslationUnitDecl());
  }

public:
  explicit ASTNodeImporter(ASTImporter &Importer) : Importer(Importer) {}

  using TypeVisitor<ASTNodeImporter, ExpectedType>::Visit;
  using DeclVisitor<ASTNodeImporter, ExpectedDecl>::Visit;
  using StmtVisitor<ASTNodeImporter, ExpectedStmt>::Visit;

  // Importing types
  ExpectedType VisitType(const Type *T);
  ExpectedType VisitAtomicType(const AtomicType *T);
  ExpectedType VisitBuiltinType(const BuiltinType *T);
  ExpectedType VisitDecayedType(const DecayedType *T);
  ExpectedType VisitComplexType(const ComplexType *T);
  ExpectedType VisitPointerType(const PointerType *T);
  ExpectedType VisitBlockPointerType(const BlockPointerType *T);
  ExpectedType VisitLValueReferenceType(const LValueReferenceType *T);
  ExpectedType VisitRValueReferenceType(const RValueReferenceType *T);
  ExpectedType VisitMemberPointerType(const MemberPointerType *T);
  ExpectedType VisitConstantArrayType(const ConstantArrayType *T);
  ExpectedType VisitIncompleteArrayType(const IncompleteArrayType *T);
  ExpectedType VisitVariableArrayType(const VariableArrayType *T);
  ExpectedType VisitDependentSizedArrayType(const DependentSizedArrayType *T);
  // FIXME: DependentSizedExtVectorType
  ExpectedType VisitVectorType(const VectorType *T);
  ExpectedType VisitExtVectorType(const ExtVectorType *T);
  ExpectedType VisitFunctionNoProtoType(const FunctionNoProtoType *T);
  ExpectedType VisitFunctionProtoType(const FunctionProtoType *T);
  ExpectedType VisitUnresolvedUsingType(const UnresolvedUsingType *T);
  ExpectedType VisitParenType(const ParenType *T);
  ExpectedType VisitTypedefType(const TypedefType *T);
  ExpectedType VisitTypeOfExprType(const TypeOfExprType *T);
  // FIXME: DependentTypeOfExprType
  ExpectedType VisitTypeOfType(const TypeOfType *T);
  ExpectedType VisitDecltypeType(const DecltypeType *T);
  ExpectedType VisitUnaryTransformType(const UnaryTransformType *T);
  ExpectedType VisitAutoType(const AutoType *T);
  ExpectedType VisitDeducedTemplateSpecializationType(
      const DeducedTemplateSpecializationType *T);
  ExpectedType VisitInjectedClassNameType(const InjectedClassNameType *T);
  // FIXME: DependentDecltypeType
  ExpectedType VisitRecordType(const RecordType *T);
  ExpectedType VisitEnumType(const EnumType *T);
  ExpectedType VisitAttributedType(const AttributedType *T);
  ExpectedType VisitTemplateTypeParmType(const TemplateTypeParmType *T);
  ExpectedType VisitSubstTemplateTypeParmType(
      const SubstTemplateTypeParmType *T);
  ExpectedType VisitTemplateSpecializationType(
      const TemplateSpecializationType *T);
  ExpectedType VisitElaboratedType(const ElaboratedType *T);
  ExpectedType VisitDependentNameType(const DependentNameType *T);
  ExpectedType VisitPackExpansionType(const PackExpansionType *T);
  ExpectedType VisitDependentTemplateSpecializationType(
      const DependentTemplateSpecializationType *T);
  ExpectedType VisitObjCInterfaceType(const ObjCInterfaceType *T);
  ExpectedType VisitObjCObjectType(const ObjCObjectType *T);
  ExpectedType VisitObjCObjectPointerType(const ObjCObjectPointerType *T);

  // Importing declarations
  Error ImportDeclParts(NamedDecl *D, DeclarationName &Name, NamedDecl *&ToD,
                        SourceLocation &Loc);
  Error ImportDeclParts(
      NamedDecl *D, DeclContext *&DC, DeclContext *&LexicalDC,
      DeclarationName &Name, NamedDecl *&ToD, SourceLocation &Loc);
  Error ImportDefinitionIfNeeded(Decl *FromD, Decl *ToD = nullptr);
  Error ImportDeclarationNameLoc(
      const DeclarationNameInfo &From, DeclarationNameInfo &To);
  Error ImportDeclContext(DeclContext *FromDC, bool ForceImport = false);
  Error ImportDeclContext(
      Decl *From, DeclContext *&ToDC, DeclContext *&ToLexicalDC);
  Error ImportImplicitMethods(const CXXRecordDecl *From, CXXRecordDecl *To);

  Expected<CXXCastPath> ImportCastPath(CastExpr *E);
  Expected<APValue> ImportAPValue(const APValue &FromValue);

  using Designator = DesignatedInitExpr::Designator;

  /// What we should import from the definition.
  enum ImportDefinitionKind {
    /// Import the default subset of the definition, which might be
    /// nothing (if minimal import is set) or might be everything (if minimal
    /// import is not set).
    IDK_Default,
    /// Import everything.
    IDK_Everything,
    /// Import only the bare bones needed to establish a valid
    /// DeclContext.
    IDK_Basic
  };

  bool shouldForceImportDeclContext(ImportDefinitionKind IDK) {
    return IDK == IDK_Everything ||
           (IDK == IDK_Default && !Importer.isMinimalImport());
  }

  Error ImportInitializer(VarDecl *From, VarDecl *To);
  Error ImportDefinition(
      RecordDecl *From, RecordDecl *To,
      ImportDefinitionKind Kind = IDK_Default);
  Error ImportDefinition(
      EnumDecl *From, EnumDecl *To,
      ImportDefinitionKind Kind = IDK_Default);
  Error ImportDefinition(
      ObjCInterfaceDecl *From, ObjCInterfaceDecl *To,
      ImportDefinitionKind Kind = IDK_Default);
  Error ImportDefinition(
      ObjCProtocolDecl *From, ObjCProtocolDecl *To,
      ImportDefinitionKind Kind = IDK_Default);
  Error ImportTemplateArguments(
      const TemplateArgument *FromArgs, unsigned NumFromArgs,
      SmallVectorImpl<TemplateArgument> &ToArgs);
  Expected<TemplateArgument>
  ImportTemplateArgument(const TemplateArgument &From);

  template <typename InContainerTy>
  Error ImportTemplateArgumentListInfo(
      const InContainerTy &Container, TemplateArgumentListInfo &ToTAInfo);

  template<typename InContainerTy>
  Error ImportTemplateArgumentListInfo(
    SourceLocation FromLAngleLoc, SourceLocation FromRAngleLoc,
    const InContainerTy &Container, TemplateArgumentListInfo &Result);

  using TemplateArgsTy = SmallVector<TemplateArgument, 8>;
  using FunctionTemplateAndArgsTy =
      std::tuple<FunctionTemplateDecl *, TemplateArgsTy>;
  Expected<FunctionTemplateAndArgsTy>
  ImportFunctionTemplateWithTemplateArgsFromSpecialization(
      FunctionDecl *FromFD);
  Error ImportTemplateParameterLists(const DeclaratorDecl *FromD,
                                     DeclaratorDecl *ToD);

  Error ImportTemplateInformation(FunctionDecl *FromFD, FunctionDecl *ToFD);

  Error ImportFunctionDeclBody(FunctionDecl *FromFD, FunctionDecl *ToFD);

  Error ImportDefaultArgOfParmVarDecl(const ParmVarDecl *FromParam,
                                      ParmVarDecl *ToParam);

  template <typename T>
  bool hasSameVisibilityContextAndLinkage(T *Found, T *From);

  bool IsStructuralMatch(Decl *From, Decl *To, bool Complain);
  bool IsStructuralMatch(RecordDecl *FromRecord, RecordDecl *ToRecord,
                         bool Complain = true);
  bool IsStructuralMatch(VarDecl *FromVar, VarDecl *ToVar,
                         bool Complain = true);
  bool IsStructuralMatch(EnumDecl *FromEnum, EnumDecl *ToRecord);
  bool IsStructuralMatch(EnumConstantDecl *FromEC, EnumConstantDecl *ToEC);
  bool IsStructuralMatch(FunctionTemplateDecl *From,
                         FunctionTemplateDecl *To);
  bool IsStructuralMatch(FunctionDecl *From, FunctionDecl *To);
  bool IsStructuralMatch(ClassTemplateDecl *From, ClassTemplateDecl *To);
  bool IsStructuralMatch(VarTemplateDecl *From, VarTemplateDecl *To);
  ExpectedDecl VisitDecl(Decl *D);
  ExpectedDecl VisitImportDecl(ImportDecl *D);
  ExpectedDecl VisitEmptyDecl(EmptyDecl *D);
  ExpectedDecl VisitAccessSpecDecl(AccessSpecDecl *D);
  ExpectedDecl VisitStaticAssertDecl(StaticAssertDecl *D);
  ExpectedDecl VisitTranslationUnitDecl(TranslationUnitDecl *D);
  ExpectedDecl VisitBindingDecl(BindingDecl *D);
  ExpectedDecl VisitNamespaceDecl(NamespaceDecl *D);
  ExpectedDecl VisitNamespaceAliasDecl(NamespaceAliasDecl *D);
  ExpectedDecl VisitTypedefNameDecl(TypedefNameDecl *D, bool IsAlias);
  ExpectedDecl VisitTypedefDecl(TypedefDecl *D);
  ExpectedDecl VisitTypeAliasDecl(TypeAliasDecl *D);
  ExpectedDecl VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D);
  ExpectedDecl VisitLabelDecl(LabelDecl *D);
  ExpectedDecl VisitEnumDecl(EnumDecl *D);
  ExpectedDecl VisitRecordDecl(RecordDecl *D);
  ExpectedDecl VisitEnumConstantDecl(EnumConstantDecl *D);
  ExpectedDecl VisitFunctionDecl(FunctionDecl *D);
  ExpectedDecl VisitCXXMethodDecl(CXXMethodDecl *D);
  ExpectedDecl VisitCXXConstructorDecl(CXXConstructorDecl *D);
  ExpectedDecl VisitCXXDestructorDecl(CXXDestructorDecl *D);
  ExpectedDecl VisitCXXConversionDecl(CXXConversionDecl *D);
  ExpectedDecl VisitCXXDeductionGuideDecl(CXXDeductionGuideDecl *D);
  ExpectedDecl VisitFieldDecl(FieldDecl *D);
  ExpectedDecl VisitIndirectFieldDecl(IndirectFieldDecl *D);
  ExpectedDecl VisitFriendDecl(FriendDecl *D);
  ExpectedDecl VisitObjCIvarDecl(ObjCIvarDecl *D);
  ExpectedDecl VisitVarDecl(VarDecl *D);
  ExpectedDecl VisitImplicitParamDecl(ImplicitParamDecl *D);
  ExpectedDecl VisitParmVarDecl(ParmVarDecl *D);
  ExpectedDecl VisitObjCMethodDecl(ObjCMethodDecl *D);
  ExpectedDecl VisitObjCTypeParamDecl(ObjCTypeParamDecl *D);
  ExpectedDecl VisitObjCCategoryDecl(ObjCCategoryDecl *D);
  ExpectedDecl VisitObjCProtocolDecl(ObjCProtocolDecl *D);
  ExpectedDecl VisitLinkageSpecDecl(LinkageSpecDecl *D);
  ExpectedDecl VisitUsingDecl(UsingDecl *D);
  ExpectedDecl VisitUsingShadowDecl(UsingShadowDecl *D);
  ExpectedDecl VisitUsingDirectiveDecl(UsingDirectiveDecl *D);
  ExpectedDecl ImportUsingShadowDecls(BaseUsingDecl *D, BaseUsingDecl *ToSI);
  ExpectedDecl VisitUsingEnumDecl(UsingEnumDecl *D);
  ExpectedDecl VisitUnresolvedUsingValueDecl(UnresolvedUsingValueDecl *D);
  ExpectedDecl VisitUnresolvedUsingTypenameDecl(UnresolvedUsingTypenameDecl *D);
  ExpectedDecl VisitBuiltinTemplateDecl(BuiltinTemplateDecl *D);
  ExpectedDecl
  VisitLifetimeExtendedTemporaryDecl(LifetimeExtendedTemporaryDecl *D);

  Expected<ObjCTypeParamList *>
  ImportObjCTypeParamList(ObjCTypeParamList *list);

  ExpectedDecl VisitObjCInterfaceDecl(ObjCInterfaceDecl *D);
  ExpectedDecl VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D);
  ExpectedDecl VisitObjCImplementationDecl(ObjCImplementationDecl *D);
  ExpectedDecl VisitObjCPropertyDecl(ObjCPropertyDecl *D);
  ExpectedDecl VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D);
  ExpectedDecl VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D);
  ExpectedDecl VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D);
  ExpectedDecl VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D);
  ExpectedDecl VisitClassTemplateDecl(ClassTemplateDecl *D);
  ExpectedDecl VisitClassTemplateSpecializationDecl(
                                          ClassTemplateSpecializationDecl *D);
  ExpectedDecl VisitVarTemplateDecl(VarTemplateDecl *D);
  ExpectedDecl VisitVarTemplateSpecializationDecl(VarTemplateSpecializationDecl *D);
  ExpectedDecl VisitFunctionTemplateDecl(FunctionTemplateDecl *D);

  // Importing statements
  ExpectedStmt VisitStmt(Stmt *S);
  ExpectedStmt VisitGCCAsmStmt(GCCAsmStmt *S);
  ExpectedStmt VisitDeclStmt(DeclStmt *S);
  ExpectedStmt VisitNullStmt(NullStmt *S);
  ExpectedStmt VisitCompoundStmt(CompoundStmt *S);
  ExpectedStmt VisitCaseStmt(CaseStmt *S);
  ExpectedStmt VisitDefaultStmt(DefaultStmt *S);
  ExpectedStmt VisitLabelStmt(LabelStmt *S);
  ExpectedStmt VisitAttributedStmt(AttributedStmt *S);
  ExpectedStmt VisitIfStmt(IfStmt *S);
  ExpectedStmt VisitSwitchStmt(SwitchStmt *S);
  ExpectedStmt VisitWhileStmt(WhileStmt *S);
  ExpectedStmt VisitDoStmt(DoStmt *S);
  ExpectedStmt VisitForStmt(ForStmt *S);
  ExpectedStmt VisitGotoStmt(GotoStmt *S);
  ExpectedStmt VisitIndirectGotoStmt(IndirectGotoStmt *S);
  ExpectedStmt VisitContinueStmt(ContinueStmt *S);
  ExpectedStmt VisitBreakStmt(BreakStmt *S);
  ExpectedStmt VisitReturnStmt(ReturnStmt *S);
  // FIXME: MSAsmStmt
  // FIXME: SEHExceptStmt
  // FIXME: SEHFinallyStmt
  // FIXME: SEHTryStmt
  // FIXME: SEHLeaveStmt
  // FIXME: CapturedStmt
  ExpectedStmt VisitCXXCatchStmt(CXXCatchStmt *S);
  ExpectedStmt VisitCXXTryStmt(CXXTryStmt *S);
  ExpectedStmt VisitCXXForRangeStmt(CXXForRangeStmt *S);
  // FIXME: MSDependentExistsStmt
  ExpectedStmt VisitObjCForCollectionStmt(ObjCForCollectionStmt *S);
  ExpectedStmt VisitObjCAtCatchStmt(ObjCAtCatchStmt *S);
  ExpectedStmt VisitObjCAtFinallyStmt(ObjCAtFinallyStmt *S);
  ExpectedStmt VisitObjCAtTryStmt(ObjCAtTryStmt *S);
  ExpectedStmt VisitObjCAtSynchronizedStmt(ObjCAtSynchronizedStmt *S);
  ExpectedStmt VisitObjCAtThrowStmt(ObjCAtThrowStmt *S);
  ExpectedStmt VisitObjCAutoreleasePoolStmt(ObjCAutoreleasePoolStmt *S);

  // Importing expressions
  ExpectedStmt VisitExpr(Expr *E);
  ExpectedStmt VisitSourceLocExpr(SourceLocExpr *E);
  ExpectedStmt VisitVAArgExpr(VAArgExpr *E);
  ExpectedStmt VisitChooseExpr(ChooseExpr *E);
  ExpectedStmt VisitGNUNullExpr(GNUNullExpr *E);
  ExpectedStmt VisitGenericSelectionExpr(GenericSelectionExpr *E);
  ExpectedStmt VisitPredefinedExpr(PredefinedExpr *E);
  ExpectedStmt VisitDeclRefExpr(DeclRefExpr *E);
  ExpectedStmt VisitImplicitValueInitExpr(ImplicitValueInitExpr *E);
  ExpectedStmt VisitDesignatedInitExpr(DesignatedInitExpr *E);
  ExpectedStmt VisitCXXNullPtrLiteralExpr(CXXNullPtrLiteralExpr *E);
  ExpectedStmt VisitIntegerLiteral(IntegerLiteral *E);
  ExpectedStmt VisitFloatingLiteral(FloatingLiteral *E);
  ExpectedStmt VisitImaginaryLiteral(ImaginaryLiteral *E);
  ExpectedStmt VisitFixedPointLiteral(FixedPointLiteral *E);
  ExpectedStmt VisitCharacterLiteral(CharacterLiteral *E);
  ExpectedStmt VisitStringLiteral(StringLiteral *E);
  ExpectedStmt VisitCompoundLiteralExpr(CompoundLiteralExpr *E);
  ExpectedStmt VisitAtomicExpr(AtomicExpr *E);
  ExpectedStmt VisitAddrLabelExpr(AddrLabelExpr *E);
  ExpectedStmt VisitConstantExpr(ConstantExpr *E);
  ExpectedStmt VisitParenExpr(ParenExpr *E);
  ExpectedStmt VisitParenListExpr(ParenListExpr *E);
  ExpectedStmt VisitStmtExpr(StmtExpr *E);
  ExpectedStmt VisitUnaryOperator(UnaryOperator *E);
  ExpectedStmt VisitUnaryExprOrTypeTraitExpr(UnaryExprOrTypeTraitExpr *E);
  ExpectedStmt VisitBinaryOperator(BinaryOperator *E);
  ExpectedStmt VisitConditionalOperator(ConditionalOperator *E);
  ExpectedStmt VisitBinaryConditionalOperator(BinaryConditionalOperator *E);
  ExpectedStmt VisitOpaqueValueExpr(OpaqueValueExpr *E);
  ExpectedStmt VisitArrayTypeTraitExpr(ArrayTypeTraitExpr *E);
  ExpectedStmt VisitExpressionTraitExpr(ExpressionTraitExpr *E);
  ExpectedStmt VisitArraySubscriptExpr(ArraySubscriptExpr *E);
  ExpectedStmt VisitCompoundAssignOperator(CompoundAssignOperator *E);
  ExpectedStmt VisitImplicitCastExpr(ImplicitCastExpr *E);
  ExpectedStmt VisitExplicitCastExpr(ExplicitCastExpr *E);
  ExpectedStmt VisitOffsetOfExpr(OffsetOfExpr *OE);
  ExpectedStmt VisitCXXThrowExpr(CXXThrowExpr *E);
  ExpectedStmt VisitCXXNoexceptExpr(CXXNoexceptExpr *E);
  ExpectedStmt VisitCXXDefaultArgExpr(CXXDefaultArgExpr *E);
  ExpectedStmt VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E);
  ExpectedStmt VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E);
  ExpectedStmt VisitCXXTemporaryObjectExpr(CXXTemporaryObjectExpr *E);
  ExpectedStmt VisitMaterializeTemporaryExpr(MaterializeTemporaryExpr *E);
  ExpectedStmt VisitPackExpansionExpr(PackExpansionExpr *E);
  ExpectedStmt VisitSizeOfPackExpr(SizeOfPackExpr *E);
  ExpectedStmt VisitCXXNewExpr(CXXNewExpr *E);
  ExpectedStmt VisitCXXDeleteExpr(CXXDeleteExpr *E);
  ExpectedStmt VisitCXXConstructExpr(CXXConstructExpr *E);
  ExpectedStmt VisitCXXMemberCallExpr(CXXMemberCallExpr *E);
  ExpectedStmt VisitCXXDependentScopeMemberExpr(CXXDependentScopeMemberExpr *E);
  ExpectedStmt VisitDependentScopeDeclRefExpr(DependentScopeDeclRefExpr *E);
  ExpectedStmt VisitCXXUnresolvedConstructExpr(CXXUnresolvedConstructExpr *E);
  ExpectedStmt VisitUnresolvedLookupExpr(UnresolvedLookupExpr *E);
  ExpectedStmt VisitUnresolvedMemberExpr(UnresolvedMemberExpr *E);
  ExpectedStmt VisitExprWithCleanups(ExprWithCleanups *E);
  ExpectedStmt VisitCXXThisExpr(CXXThisExpr *E);
  ExpectedStmt VisitCXXBoolLiteralExpr(CXXBoolLiteralExpr *E);
  ExpectedStmt VisitCXXPseudoDestructorExpr(CXXPseudoDestructorExpr *E);
  ExpectedStmt VisitMemberExpr(MemberExpr *E);
  ExpectedStmt VisitCallExpr(CallExpr *E);
  ExpectedStmt VisitLambdaExpr(LambdaExpr *LE);
  ExpectedStmt VisitInitListExpr(InitListExpr *E);
  ExpectedStmt VisitCXXStdInitializerListExpr(CXXStdInitializerListExpr *E);
  ExpectedStmt VisitCXXInheritedCtorInitExpr(CXXInheritedCtorInitExpr *E);
  ExpectedStmt VisitArrayInitLoopExpr(ArrayInitLoopExpr *E);
  ExpectedStmt VisitArrayInitIndexExpr(ArrayInitIndexExpr *E);
  ExpectedStmt VisitCXXDefaultInitExpr(CXXDefaultInitExpr *E);
  ExpectedStmt VisitCXXNamedCastExpr(CXXNamedCastExpr *E);
  ExpectedStmt VisitSubstNonTypeTemplateParmExpr(SubstNonTypeTemplateParmExpr *E);
  ExpectedStmt VisitTypeTraitExpr(TypeTraitExpr *E);
  ExpectedStmt VisitCXXTypeidExpr(CXXTypeidExpr *E);
  ExpectedStmt VisitCXXFoldExpr(CXXFoldExpr *E);

  template<typename IIter, typename OIter>
  Error ImportArrayChecked(IIter Ibegin, IIter Iend, OIter Obegin) {
    using ItemT = std::remove_reference_t<decltype(*Obegin)>;
    for (; Ibegin != Iend; ++Ibegin, ++Obegin) {
      Expected<ItemT> ToOrErr = import(*Ibegin);
      if (!ToOrErr)
        return ToOrErr.takeError();
      *Obegin = *ToOrErr;
    }
    return Error::success();
  }

  // Import every item from a container structure into an output container.
  // If error occurs, stops at first error and returns the error.
  // The output container should have space for all needed elements (it is not
  // expanded, new items are put into from the beginning).
  template<typename InContainerTy, typename OutContainerTy>
  Error ImportContainerChecked(
      const InContainerTy &InContainer, OutContainerTy &OutContainer) {
    return ImportArrayChecked(
        InContainer.begin(), InContainer.end(), OutContainer.begin());
  }

  template<typename InContainerTy, typename OIter>
  Error ImportArrayChecked(const InContainerTy &InContainer, OIter Obegin) {
    return ImportArrayChecked(InContainer.begin(), InContainer.end(), Obegin);
  }

  Error ImportOverriddenMethods(CXXMethodDecl *ToMethod,
                                CXXMethodDecl *FromMethod);

  Expected<FunctionDecl *> FindFunctionTemplateSpecialization(
      FunctionDecl *FromFD);

  // Returns true if the given function has a placeholder return type and
  // that type is declared inside the body of the function.
  // E.g. auto f() { struct X{}; return X(); }
  bool hasAutoReturnTypeDeclaredInside(FunctionDecl *D);
};

710template <typename InContainerTy>
711Error ASTNodeImporter::ImportTemplateArgumentListInfo(
  SourceLocation FromLAngleLoc, SourceLocation FromRAngleLoc,
  const InContainerTy &Container, TemplateArgumentListInfo &Result) {
auto ToLAngleLocOrErr = import(FromLAngleLoc);
if (!ToLAngleLocOrErr)
  return ToLAngleLocOrErr.takeError();
auto ToRAngleLocOrErr = import(FromRAngleLoc);
if (!ToRAngleLocOrErr)
  return ToRAngleLocOrErr.takeError();

TemplateArgumentListInfo ToTAInfo(*ToLAngleLocOrErr, *ToRAngleLocOrErr);
if (auto Err = ImportTemplateArgumentListInfo(Container, ToTAInfo))
  return Err;
Result = ToTAInfo;
return Error::success();
726}

728template <>
729Error ASTNodeImporter::ImportTemplateArgumentListInfo<TemplateArgumentListInfo>(
  const TemplateArgumentListInfo &From, TemplateArgumentListInfo &Result) {
return ImportTemplateArgumentListInfo(
    From.getLAngleLoc(), From.getRAngleLoc(), From.arguments(), Result);
733}

735template <>
736Error ASTNodeImporter::ImportTemplateArgumentListInfo<
  ASTTemplateArgumentListInfo>(
      const ASTTemplateArgumentListInfo &From,
      TemplateArgumentListInfo &Result) {
return ImportTemplateArgumentListInfo(
    From.LAngleLoc, From.RAngleLoc, From.arguments(), Result);
742}

744Expected<ASTNodeImporter::FunctionTemplateAndArgsTy>
745ASTNodeImporter::ImportFunctionTemplateWithTemplateArgsFromSpecialization(
  FunctionDecl *FromFD) {
assert(FromFD->getTemplatedKind() ==((void)0)
    FunctionDecl::TK_FunctionTemplateSpecialization)((void)0);

FunctionTemplateAndArgsTy Result;

auto *FTSInfo = FromFD->getTemplateSpecializationInfo();
if (Error Err = importInto(std::get<0>(Result), FTSInfo->getTemplate()))
  return std::move(Err);

// Import template arguments.
auto TemplArgs = FTSInfo->TemplateArguments->asArray();
if (Error Err = ImportTemplateArguments(TemplArgs.data(), TemplArgs.size(),
    std::get<1>(Result)))
  return std::move(Err);

return Result;
763}

765template <>
766Expected<TemplateParameterList *>
767ASTNodeImporter::import(TemplateParameterList *From) {
SmallVector<NamedDecl *, 4> To(From->size());
if (Error Err = ImportContainerChecked(*From, To))
  return std::move(Err);

ExpectedExpr ToRequiresClause = import(From->getRequiresClause());
if (!ToRequiresClause)
  return ToRequiresClause.takeError();

auto ToTemplateLocOrErr = import(From->getTemplateLoc());
if (!ToTemplateLocOrErr)
  return ToTemplateLocOrErr.takeError();
auto ToLAngleLocOrErr = import(From->getLAngleLoc());
if (!ToLAngleLocOrErr)
  return ToLAngleLocOrErr.takeError();
auto ToRAngleLocOrErr = import(From->getRAngleLoc());
if (!ToRAngleLocOrErr)
  return ToRAngleLocOrErr.takeError();

return TemplateParameterList::Create(
    Importer.getToContext(),
    *ToTemplateLocOrErr,
    *ToLAngleLocOrErr,
    To,
    *ToRAngleLocOrErr,
    *ToRequiresClause);
793}

795template <>
796Expected<TemplateArgument>
797ASTNodeImporter::import(const TemplateArgument &From) {
switch (From.getKind()) {
case TemplateArgument::Null:
  return TemplateArgument();

case TemplateArgument::Type: {
  ExpectedType ToTypeOrErr = import(From.getAsType());
  if (!ToTypeOrErr)
    return ToTypeOrErr.takeError();
  return TemplateArgument(*ToTypeOrErr);
}

case TemplateArgument::Integral: {
  ExpectedType ToTypeOrErr = import(From.getIntegralType());
  if (!ToTypeOrErr)
    return ToTypeOrErr.takeError();
  return TemplateArgument(From, *ToTypeOrErr);
}

case TemplateArgument::Declaration: {
  Expected<ValueDecl *> ToOrErr = import(From.getAsDecl());
  if (!ToOrErr)
    return ToOrErr.takeError();
  ExpectedType ToTypeOrErr = import(From.getParamTypeForDecl());
  if (!ToTypeOrErr)
    return ToTypeOrErr.takeError();
  return TemplateArgument(*ToOrErr, *ToTypeOrErr);
}

case TemplateArgument::NullPtr: {
  ExpectedType ToTypeOrErr = import(From.getNullPtrType());
  if (!ToTypeOrErr)
    return ToTypeOrErr.takeError();
  return TemplateArgument(*ToTypeOrErr, /*isNullPtr*/true);
}

case TemplateArgument::Template: {
  Expected<TemplateName> ToTemplateOrErr = import(From.getAsTemplate());
  if (!ToTemplateOrErr)
    return ToTemplateOrErr.takeError();

  return TemplateArgument(*ToTemplateOrErr);
}

case TemplateArgument::TemplateExpansion: {
  Expected<TemplateName> ToTemplateOrErr =
      import(From.getAsTemplateOrTemplatePattern());
  if (!ToTemplateOrErr)
    return ToTemplateOrErr.takeError();

  return TemplateArgument(
      *ToTemplateOrErr, From.getNumTemplateExpansions());
}

case TemplateArgument::Expression:
  if (ExpectedExpr ToExpr = import(From.getAsExpr()))
    return TemplateArgument(*ToExpr);
  else
    return ToExpr.takeError();

case TemplateArgument::Pack: {
  SmallVector<TemplateArgument, 2> ToPack;
  ToPack.reserve(From.pack_size());
  if (Error Err = ImportTemplateArguments(
      From.pack_begin(), From.pack_size(), ToPack))
    return std::move(Err);

  return TemplateArgument(
      llvm::makeArrayRef(ToPack).copy(Importer.getToContext()));
}
}

llvm_unreachable("Invalid template argument kind")__builtin_unreachable();
870}

872template <>
873Expected<TemplateArgumentLoc>
874ASTNodeImporter::import(const TemplateArgumentLoc &TALoc) {
Expected<TemplateArgument> ArgOrErr = import(TALoc.getArgument());
if (!ArgOrErr)
  return ArgOrErr.takeError();
TemplateArgument Arg = *ArgOrErr;

TemplateArgumentLocInfo FromInfo = TALoc.getLocInfo();

TemplateArgumentLocInfo ToInfo;
if (Arg.getKind() == TemplateArgument::Expression) {
  ExpectedExpr E = import(FromInfo.getAsExpr());
  if (!E)
    return E.takeError();
  ToInfo = TemplateArgumentLocInfo(*E);
} else if (Arg.getKind() == TemplateArgument::Type) {
  if (auto TSIOrErr = import(FromInfo.getAsTypeSourceInfo()))
    ToInfo = TemplateArgumentLocInfo(*TSIOrErr);
  else
    return TSIOrErr.takeError();
} else {
  auto ToTemplateQualifierLocOrErr =
      import(FromInfo.getTemplateQualifierLoc());
  if (!ToTemplateQualifierLocOrErr)
    return ToTemplateQualifierLocOrErr.takeError();
  auto ToTemplateNameLocOrErr = import(FromInfo.getTemplateNameLoc());
  if (!ToTemplateNameLocOrErr)
    return ToTemplateNameLocOrErr.takeError();
  auto ToTemplateEllipsisLocOrErr =
      import(FromInfo.getTemplateEllipsisLoc());
  if (!ToTemplateEllipsisLocOrErr)
    return ToTemplateEllipsisLocOrErr.takeError();
  ToInfo = TemplateArgumentLocInfo(
      Importer.getToContext(), *ToTemplateQualifierLocOrErr,
      *ToTemplateNameLocOrErr, *ToTemplateEllipsisLocOrErr);
}

return TemplateArgumentLoc(Arg, ToInfo);
911}

913template <>
914Expected<DeclGroupRef> ASTNodeImporter::import(const DeclGroupRef &DG) {
if (DG.isNull())
  return DeclGroupRef::Create(Importer.getToContext(), nullptr, 0);
size_t NumDecls = DG.end() - DG.begin();
SmallVector<Decl *, 1> ToDecls;
ToDecls.reserve(NumDecls);
for (Decl *FromD : DG) {
  if (auto ToDOrErr = import(FromD))
    ToDecls.push_back(*ToDOrErr);
  else
    return ToDOrErr.takeError();
}
return DeclGroupRef::Create(Importer.getToContext(),
                            ToDecls.begin(),
                            NumDecls);
929}

931template <>
932Expected<ASTNodeImporter::Designator>
933ASTNodeImporter::import(const Designator &D) {
if (D.isFieldDesignator()) {
  IdentifierInfo *ToFieldName = Importer.Import(D.getFieldName());

  ExpectedSLoc ToDotLocOrErr = import(D.getDotLoc());
  if (!ToDotLocOrErr)
    return ToDotLocOrErr.takeError();

  ExpectedSLoc ToFieldLocOrErr = import(D.getFieldLoc());
  if (!ToFieldLocOrErr)
    return ToFieldLocOrErr.takeError();

  return Designator(ToFieldName, *ToDotLocOrErr, *ToFieldLocOrErr);
}

ExpectedSLoc ToLBracketLocOrErr = import(D.getLBracketLoc());
if (!ToLBracketLocOrErr)
  return ToLBracketLocOrErr.takeError();

ExpectedSLoc ToRBracketLocOrErr = import(D.getRBracketLoc());
if (!ToRBracketLocOrErr)
  return ToRBracketLocOrErr.takeError();

if (D.isArrayDesignator())
  return Designator(D.getFirstExprIndex(),
                    *ToLBracketLocOrErr, *ToRBracketLocOrErr);

ExpectedSLoc ToEllipsisLocOrErr = import(D.getEllipsisLoc());
if (!ToEllipsisLocOrErr)
  return ToEllipsisLocOrErr.takeError();

assert(D.isArrayRangeDesignator())((void)0);
return Designator(
    D.getFirstExprIndex(), *ToLBracketLocOrErr, *ToEllipsisLocOrErr,
    *ToRBracketLocOrErr);
968}

970template <>
971Expected<LambdaCapture> ASTNodeImporter::import(const LambdaCapture &From) {
VarDecl *Var = nullptr;
if (From.capturesVariable()) {
  if (auto VarOrErr = import(From.getCapturedVar()))
    Var = *VarOrErr;
  else
    return VarOrErr.takeError();
}

auto LocationOrErr = import(From.getLocation());
if (!LocationOrErr)
  return LocationOrErr.takeError();

SourceLocation EllipsisLoc;
if (From.isPackExpansion())
  if (Error Err = importInto(EllipsisLoc, From.getEllipsisLoc()))
    return std::move(Err);

return LambdaCapture(
    *LocationOrErr, From.isImplicit(), From.getCaptureKind(), Var,
    EllipsisLoc);
992}

994template <typename T>
995bool ASTNodeImporter::hasSameVisibilityContextAndLinkage(T *Found, T *From) {
if (Found->getLinkageInternal() != From->getLinkageInternal())
  return false;

if (From->hasExternalFormalLinkage())
  return Found->hasExternalFormalLinkage();
if (Importer.GetFromTU(Found) != From->getTranslationUnitDecl())
  return false;
if (From->isInAnonymousNamespace())
  return Found->isInAnonymousNamespace();
else
  return !Found->isInAnonymousNamespace() &&
         !Found->hasExternalFormalLinkage();
1008}

1010template <>
1011bool ASTNodeImporter::hasSameVisibilityContextAndLinkage(TypedefNameDecl *Found,
                                             TypedefNameDecl *From) {
if (Found->getLinkageInternal() != From->getLinkageInternal())
  return false;

if (From->isInAnonymousNamespace() && Found->isInAnonymousNamespace())
  return Importer.GetFromTU(Found) == From->getTranslationUnitDecl();
return From->isInAnonymousNamespace() == Found->isInAnonymousNamespace();
1019}

1021} // namespace clang

1023//----------------------------------------------------------------------------
1024// Import Types
1025//----------------------------------------------------------------------------

1027using namespace clang;

1029ExpectedType ASTNodeImporter::VisitType(const Type *T) {
Importer.FromDiag(SourceLocation(), diag::err_unsupported_ast_node)
  << T->getTypeClassName();
return make_error<ImportError>(ImportError::UnsupportedConstruct);
1033}

1035ExpectedType ASTNodeImporter::VisitAtomicType(const AtomicType *T){
ExpectedType UnderlyingTypeOrErr = import(T->getValueType());
if (!UnderlyingTypeOrErr)
  return UnderlyingTypeOrErr.takeError();

return Importer.getToContext().getAtomicType(*UnderlyingTypeOrErr);
1041}

1043ExpectedType ASTNodeImporter::VisitBuiltinType(const BuiltinType *T) {
switch (T->getKind()) {
1045#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
case BuiltinType::Id: \
  return Importer.getToContext().SingletonId;
1048#include "clang/Basic/OpenCLImageTypes.def"
1049#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
case BuiltinType::Id: \
  return Importer.getToContext().Id##Ty;
1052#include "clang/Basic/OpenCLExtensionTypes.def"
1053#define SVE_TYPE(Name, Id, SingletonId) \
case BuiltinType::Id: \
  return Importer.getToContext().SingletonId;
1056#include "clang/Basic/AArch64SVEACLETypes.def"
1057#define PPC_VECTOR_TYPE(Name, Id, Size) \
case BuiltinType::Id: \
  return Importer.getToContext().Id##Ty;
1060#include "clang/Basic/PPCTypes.def"
1061#define RVV_TYPE(Name, Id, SingletonId)                                        \
case BuiltinType::Id:                                                        \
  return Importer.getToContext().SingletonId;
1064#include "clang/Basic/RISCVVTypes.def"
1065#define SHARED_SINGLETON_TYPE(Expansion)
1066#define BUILTIN_TYPE(Id, SingletonId) \
case BuiltinType::Id: return Importer.getToContext().SingletonId;
1068#include "clang/AST/BuiltinTypes.def"

// FIXME: for Char16, Char32, and NullPtr, make sure that the "to"
// context supports C++.

// FIXME: for ObjCId, ObjCClass, and ObjCSel, make sure that the "to"
// context supports ObjC.

case BuiltinType::Char_U:
  // The context we're importing from has an unsigned 'char'. If we're
  // importing into a context with a signed 'char', translate to
  // 'unsigned char' instead.
  if (Importer.getToContext().getLangOpts().CharIsSigned)
    return Importer.getToContext().UnsignedCharTy;

  return Importer.getToContext().CharTy;

case BuiltinType::Char_S:
  // The context we're importing from has an unsigned 'char'. If we're
  // importing into a context with a signed 'char', translate to
  // 'unsigned char' instead.
  if (!Importer.getToContext().getLangOpts().CharIsSigned)
    return Importer.getToContext().SignedCharTy;

  return Importer.getToContext().CharTy;

case BuiltinType::WChar_S:
case BuiltinType::WChar_U:
  // FIXME: If not in C++, shall we translate to the C equivalent of
  // wchar_t?
  return Importer.getToContext().WCharTy;
}

llvm_unreachable("Invalid BuiltinType Kind!")__builtin_unreachable();
1102}

1104ExpectedType ASTNodeImporter::VisitDecayedType(const DecayedType *T) {
ExpectedType ToOriginalTypeOrErr = import(T->getOriginalType());
if (!ToOriginalTypeOrErr)
  return ToOriginalTypeOrErr.takeError();

return Importer.getToContext().getDecayedType(*ToOriginalTypeOrErr);
1110}

1112ExpectedType ASTNodeImporter::VisitComplexType(const ComplexType *T) {
ExpectedType ToElementTypeOrErr = import(T->getElementType());
if (!ToElementTypeOrErr)
  return ToElementTypeOrErr.takeError();

return Importer.getToContext().getComplexType(*ToElementTypeOrErr);
1118}

1120ExpectedType ASTNodeImporter::VisitPointerType(const PointerType *T) {
ExpectedType ToPointeeTypeOrErr = import(T->getPointeeType());
if (!ToPointeeTypeOrErr)
  return ToPointeeTypeOrErr.takeError();

return Importer.getToContext().getPointerType(*ToPointeeTypeOrErr);
1126}

1128ExpectedType ASTNodeImporter::VisitBlockPointerType(const BlockPointerType *T) {
// FIXME: Check for blocks support in "to" context.
ExpectedType ToPointeeTypeOrErr = import(T->getPointeeType());
if (!ToPointeeTypeOrErr)
  return ToPointeeTypeOrErr.takeError();

return Importer.getToContext().getBlockPointerType(*ToPointeeTypeOrErr);
1135}

1137ExpectedType
1138ASTNodeImporter::VisitLValueReferenceType(const LValueReferenceType *T) {
// FIXME: Check for C++ support in "to" context.
ExpectedType ToPointeeTypeOrErr = import(T->getPointeeTypeAsWritten());
if (!ToPointeeTypeOrErr)
  return ToPointeeTypeOrErr.takeError();

return Importer.getToContext().getLValueReferenceType(*ToPointeeTypeOrErr);
1145}

1147ExpectedType
1148ASTNodeImporter::VisitRValueReferenceType(const RValueReferenceType *T) {
// FIXME: Check for C++0x support in "to" context.
ExpectedType ToPointeeTypeOrErr = import(T->getPointeeTypeAsWritten());
if (!ToPointeeTypeOrErr)
  return ToPointeeTypeOrErr.takeError();

return Importer.getToContext().getRValueReferenceType(*ToPointeeTypeOrErr);
1155}

1157ExpectedType
1158ASTNodeImporter::VisitMemberPointerType(const MemberPointerType *T) {
// FIXME: Check for C++ support in "to" context.
ExpectedType ToPointeeTypeOrErr = import(T->getPointeeType());
if (!ToPointeeTypeOrErr)
  return ToPointeeTypeOrErr.takeError();

ExpectedType ClassTypeOrErr = import(QualType(T->getClass(), 0));
if (!ClassTypeOrErr)
  return ClassTypeOrErr.takeError();

return Importer.getToContext().getMemberPointerType(
    *ToPointeeTypeOrErr, (*ClassTypeOrErr).getTypePtr());
1170}

1172ExpectedType
1173ASTNodeImporter::VisitConstantArrayType(const ConstantArrayType *T) {
Error Err = Error::success();
auto ToElementType = importChecked(Err, T->getElementType());
auto ToSizeExpr = importChecked(Err, T->getSizeExpr());
if (Err)
  return std::move(Err);

return Importer.getToContext().getConstantArrayType(
    ToElementType, T->getSize(), ToSizeExpr, T->getSizeModifier(),
    T->getIndexTypeCVRQualifiers());
1183}

1185ExpectedType
1186ASTNodeImporter::VisitIncompleteArrayType(const IncompleteArrayType *T) {
ExpectedType ToElementTypeOrErr = import(T->getElementType());
if (!ToElementTypeOrErr)
  return ToElementTypeOrErr.takeError();

return Importer.getToContext().getIncompleteArrayType(*ToElementTypeOrErr,
                                                      T->getSizeModifier(),
                                              T->getIndexTypeCVRQualifiers());
1194}

1196ExpectedType
1197ASTNodeImporter::VisitVariableArrayType(const VariableArrayType *T) {
Error Err = Error::success();
QualType ToElementType = importChecked(Err, T->getElementType());
Expr *ToSizeExpr = importChecked(Err, T->getSizeExpr());
SourceRange ToBracketsRange = importChecked(Err, T->getBracketsRange());
if (Err)
  return std::move(Err);
return Importer.getToContext().getVariableArrayType(
    ToElementType, ToSizeExpr, T->getSizeModifier(),
    T->getIndexTypeCVRQualifiers(), ToBracketsRange);
1207}

1209ExpectedType ASTNodeImporter::VisitDependentSizedArrayType(
  const DependentSizedArrayType *T) {
Error Err = Error::success();
QualType ToElementType = importChecked(Err, T->getElementType());
Expr *ToSizeExpr = importChecked(Err, T->getSizeExpr());
SourceRange ToBracketsRange = importChecked(Err, T->getBracketsRange());
if (Err)
  return std::move(Err);
// SizeExpr may be null if size is not specified directly.
// For example, 'int a[]'.

return Importer.getToContext().getDependentSizedArrayType(
    ToElementType, ToSizeExpr, T->getSizeModifier(),
    T->getIndexTypeCVRQualifiers(), ToBracketsRange);
1223}

1225ExpectedType ASTNodeImporter::VisitVectorType(const VectorType *T) {
ExpectedType ToElementTypeOrErr = import(T->getElementType());
if (!ToElementTypeOrErr)
  return ToElementTypeOrErr.takeError();

return Importer.getToContext().getVectorType(*ToElementTypeOrErr,
                                             T->getNumElements(),
                                             T->getVectorKind());
1233}

1235ExpectedType ASTNodeImporter::VisitExtVectorType(const ExtVectorType *T) {
ExpectedType ToElementTypeOrErr = import(T->getElementType());
if (!ToElementTypeOrErr)
  return ToElementTypeOrErr.takeError();

return Importer.getToContext().getExtVectorType(*ToElementTypeOrErr,
                                                T->getNumElements());
1242}

1244ExpectedType
1245ASTNodeImporter::VisitFunctionNoProtoType(const FunctionNoProtoType *T) {
// FIXME: What happens if we're importing a function without a prototype
// into C++? Should we make it variadic?
ExpectedType ToReturnTypeOrErr = import(T->getReturnType());
if (!ToReturnTypeOrErr)
  return ToReturnTypeOrErr.takeError();

return Importer.getToContext().getFunctionNoProtoType(*ToReturnTypeOrErr,
                                                      T->getExtInfo());
1254}

1256ExpectedType
1257ASTNodeImporter::VisitFunctionProtoType(const FunctionProtoType *T) {
ExpectedType ToReturnTypeOrErr = import(T->getReturnType());
if (!ToReturnTypeOrErr)
  return ToReturnTypeOrErr.takeError();

// Import argument types
SmallVector<QualType, 4> ArgTypes;
for (const auto &A : T->param_types()) {
  ExpectedType TyOrErr = import(A);
  if (!TyOrErr)
    return TyOrErr.takeError();
  ArgTypes.push_back(*TyOrErr);
}

// Import exception types
SmallVector<QualType, 4> ExceptionTypes;
for (const auto &E : T->exceptions()) {
  ExpectedType TyOrErr = import(E);
  if (!TyOrErr)
    return TyOrErr.takeError();
  ExceptionTypes.push_back(*TyOrErr);
}

FunctionProtoType::ExtProtoInfo FromEPI = T->getExtProtoInfo();
Error Err = Error::success();
FunctionProtoType::ExtProtoInfo ToEPI;
ToEPI.ExtInfo = FromEPI.ExtInfo;
ToEPI.Variadic = FromEPI.Variadic;
ToEPI.HasTrailingReturn = FromEPI.HasTrailingReturn;
ToEPI.TypeQuals = FromEPI.TypeQuals;
ToEPI.RefQualifier = FromEPI.RefQualifier;
ToEPI.ExceptionSpec.Type = FromEPI.ExceptionSpec.Type;
ToEPI.ExceptionSpec.NoexceptExpr =
    importChecked(Err, FromEPI.ExceptionSpec.NoexceptExpr);
ToEPI.ExceptionSpec.SourceDecl =
    importChecked(Err, FromEPI.ExceptionSpec.SourceDecl);
ToEPI.ExceptionSpec.SourceTemplate =
    importChecked(Err, FromEPI.ExceptionSpec.SourceTemplate);
ToEPI.ExceptionSpec.Exceptions = ExceptionTypes;

if (Err)
  return std::move(Err);

return Importer.getToContext().getFunctionType(
    *ToReturnTypeOrErr, ArgTypes, ToEPI);
1302}

1304ExpectedType ASTNodeImporter::VisitUnresolvedUsingType(
  const UnresolvedUsingType *T) {
Error Err = Error::success();
auto ToD = importChecked(Err, T->getDecl());
auto ToPrevD = importChecked(Err, T->getDecl()->getPreviousDecl());
if (Err)
  return std::move(Err);

return Importer.getToContext().getTypeDeclType(
    ToD, cast_or_null<TypeDecl>(ToPrevD));
1314}

1316ExpectedType ASTNodeImporter::VisitParenType(const ParenType *T) {
ExpectedType ToInnerTypeOrErr = import(T->getInnerType());
if (!ToInnerTypeOrErr)
  return ToInnerTypeOrErr.takeError();

return Importer.getToContext().getParenType(*ToInnerTypeOrErr);
1322}

1324ExpectedType ASTNodeImporter::VisitTypedefType(const TypedefType *T) {
Expected<TypedefNameDecl *> ToDeclOrErr = import(T->getDecl());
if (!ToDeclOrErr)
  return ToDeclOrErr.takeError();

return Importer.getToContext().getTypeDeclType(*ToDeclOrErr);
1330}

1332ExpectedType ASTNodeImporter::VisitTypeOfExprType(const TypeOfExprType *T) {
ExpectedExpr ToExprOrErr = import(T->getUnderlyingExpr());
if (!ToExprOrErr)
  return ToExprOrErr.takeError();

return Importer.getToContext().getTypeOfExprType(*ToExprOrErr);
1338}

1340ExpectedType ASTNodeImporter::VisitTypeOfType(const TypeOfType *T) {
ExpectedType ToUnderlyingTypeOrErr = import(T->getUnderlyingType());
if (!ToUnderlyingTypeOrErr)
  return ToUnderlyingTypeOrErr.takeError();

return Importer.getToContext().getTypeOfType(*ToUnderlyingTypeOrErr);
1346}

1348ExpectedType ASTNodeImporter::VisitDecltypeType(const DecltypeType *T) {
// FIXME: Make sure that the "to" context supports C++0x!
ExpectedExpr ToExprOrErr = import(T->getUnderlyingExpr());
if (!ToExprOrErr)
  return ToExprOrErr.takeError();

ExpectedType ToUnderlyingTypeOrErr = import(T->getUnderlyingType());
if (!ToUnderlyingTypeOrErr)
  return ToUnderlyingTypeOrErr.takeError();

return Importer.getToContext().getDecltypeType(
    *ToExprOrErr, *ToUnderlyingTypeOrErr);
1360}

1362ExpectedType
1363ASTNodeImporter::VisitUnaryTransformType(const UnaryTransformType *T) {
ExpectedType ToBaseTypeOrErr = import(T->getBaseType());
if (!ToBaseTypeOrErr)
  return ToBaseTypeOrErr.takeError();

ExpectedType ToUnderlyingTypeOrErr = import(T->getUnderlyingType());
if (!ToUnderlyingTypeOrErr)
  return ToUnderlyingTypeOrErr.takeError();

return Importer.getToContext().getUnaryTransformType(
    *ToBaseTypeOrErr, *ToUnderlyingTypeOrErr, T->getUTTKind());
1374}

1376ExpectedType ASTNodeImporter::VisitAutoType(const AutoType *T) {
// FIXME: Make sure that the "to" context supports C++11!
ExpectedType ToDeducedTypeOrErr = import(T->getDeducedType());
if (!ToDeducedTypeOrErr)
  return ToDeducedTypeOrErr.takeError();

ExpectedDecl ToTypeConstraintConcept = import(T->getTypeConstraintConcept());
if (!ToTypeConstraintConcept)
  return ToTypeConstraintConcept.takeError();

SmallVector<TemplateArgument, 2> ToTemplateArgs;
ArrayRef<TemplateArgument> FromTemplateArgs = T->getTypeConstraintArguments();
if (Error Err = ImportTemplateArguments(FromTemplateArgs.data(),
                                        FromTemplateArgs.size(),
                                        ToTemplateArgs))
  return std::move(Err);

return Importer.getToContext().getAutoType(
    *ToDeducedTypeOrErr, T->getKeyword(), /*IsDependent*/false,
    /*IsPack=*/false, cast_or_null<ConceptDecl>(*ToTypeConstraintConcept),
    ToTemplateArgs);
1397}

1399ExpectedType ASTNodeImporter::VisitDeducedTemplateSpecializationType(
  const DeducedTemplateSpecializationType *T) {
// FIXME: Make sure that the "to" context supports C++17!
Expected<TemplateName> ToTemplateNameOrErr = import(T->getTemplateName());
if (!ToTemplateNameOrErr)
  return ToTemplateNameOrErr.takeError();
ExpectedType ToDeducedTypeOrErr = import(T->getDeducedType());
if (!ToDeducedTypeOrErr)
  return ToDeducedTypeOrErr.takeError();

return Importer.getToContext().getDeducedTemplateSpecializationType(
    *ToTemplateNameOrErr, *ToDeducedTypeOrErr, T->isDependentType());
1411}

1413ExpectedType ASTNodeImporter::VisitInjectedClassNameType(
  const InjectedClassNameType *T) {
Expected<CXXRecordDecl *> ToDeclOrErr = import(T->getDecl());
if (!ToDeclOrErr)
  return ToDeclOrErr.takeError();

ExpectedType ToInjTypeOrErr = import(T->getInjectedSpecializationType());
if (!ToInjTypeOrErr)
  return ToInjTypeOrErr.takeError();

// FIXME: ASTContext::getInjectedClassNameType is not suitable for AST reading
// See comments in InjectedClassNameType definition for details
// return Importer.getToContext().getInjectedClassNameType(D, InjType);
enum {
  TypeAlignmentInBits = 4,
  TypeAlignment = 1 << TypeAlignmentInBits
};

return QualType(new (Importer.getToContext(), TypeAlignment)
                InjectedClassNameType(*ToDeclOrErr, *ToInjTypeOrErr), 0);
1433}

1435ExpectedType ASTNodeImporter::VisitRecordType(const RecordType *T) {
Expected<RecordDecl *> ToDeclOrErr = import(T->getDecl());
if (!ToDeclOrErr)
  return ToDeclOrErr.takeError();

return Importer.getToContext().getTagDeclType(*ToDeclOrErr);
1441}

1443ExpectedType ASTNodeImporter::VisitEnumType(const EnumType *T) {
Expected<EnumDecl *> ToDeclOrErr = import(T->getDecl());
if (!ToDeclOrErr)
  return ToDeclOrErr.takeError();

return Importer.getToContext().getTagDeclType(*ToDeclOrErr);
1449}

1451ExpectedType ASTNodeImporter::VisitAttributedType(const AttributedType *T) {
ExpectedType ToModifiedTypeOrErr = import(T->getModifiedType());
if (!ToModifiedTypeOrErr)
  return ToModifiedTypeOrErr.takeError();
ExpectedType ToEquivalentTypeOrErr = import(T->getEquivalentType());
if (!ToEquivalentTypeOrErr)
  return ToEquivalentTypeOrErr.takeError();

return Importer.getToContext().getAttributedType(T->getAttrKind(),
    *ToModifiedTypeOrErr, *ToEquivalentTypeOrErr);
1461}

1463ExpectedType ASTNodeImporter::VisitTemplateTypeParmType(
  const TemplateTypeParmType *T) {
Expected<TemplateTypeParmDecl *> ToDeclOrErr = import(T->getDecl());
if (!ToDeclOrErr)
  return ToDeclOrErr.takeError();

return Importer.getToContext().getTemplateTypeParmType(
    T->getDepth(), T->getIndex(), T->isParameterPack(), *ToDeclOrErr);
1471}

1473ExpectedType ASTNodeImporter::VisitSubstTemplateTypeParmType(
  const SubstTemplateTypeParmType *T) {
ExpectedType ReplacedOrErr = import(QualType(T->getReplacedParameter(), 0));
if (!ReplacedOrErr)
  return ReplacedOrErr.takeError();
const TemplateTypeParmType *Replaced =
    cast<TemplateTypeParmType>((*ReplacedOrErr).getTypePtr());

ExpectedType ToReplacementTypeOrErr = import(T->getReplacementType());
if (!ToReplacementTypeOrErr)
  return ToReplacementTypeOrErr.takeError();

return Importer.getToContext().getSubstTemplateTypeParmType(
      Replaced, (*ToReplacementTypeOrErr).getCanonicalType());
1487}

1489ExpectedType ASTNodeImporter::VisitTemplateSpecializationType(
                                     const TemplateSpecializationType *T) {
auto ToTemplateOrErr = import(T->getTemplateName());
if (!ToTemplateOrErr)
  return ToTemplateOrErr.takeError();

SmallVector<TemplateArgument, 2> ToTemplateArgs;
if (Error Err = ImportTemplateArguments(
    T->getArgs(), T->getNumArgs(), ToTemplateArgs))
  return std::move(Err);

QualType ToCanonType;
if (!QualType(T, 0).isCanonical()) {
  QualType FromCanonType
    = Importer.getFromContext().getCanonicalType(QualType(T, 0));
  if (ExpectedType TyOrErr = import(FromCanonType))
    ToCanonType = *TyOrErr;
  else
    return TyOrErr.takeError();
}
return Importer.getToContext().getTemplateSpecializationType(*ToTemplateOrErr,
                                                             ToTemplateArgs,
                                                             ToCanonType);
1512}

1514ExpectedType ASTNodeImporter::VisitElaboratedType(const ElaboratedType *T) {
// Note: the qualifier in an ElaboratedType is optional.
auto ToQualifierOrErr = import(T->getQualifier());
if (!ToQualifierOrErr)
  return ToQualifierOrErr.takeError();

ExpectedType ToNamedTypeOrErr = import(T->getNamedType());
if (!ToNamedTypeOrErr)
  return ToNamedTypeOrErr.takeError();

Expected<TagDecl *> ToOwnedTagDeclOrErr = import(T->getOwnedTagDecl());
if (!ToOwnedTagDeclOrErr)
  return ToOwnedTagDeclOrErr.takeError();

return Importer.getToContext().getElaboratedType(T->getKeyword(),
                                                 *ToQualifierOrErr,
                                                 *ToNamedTypeOrErr,
                                                 *ToOwnedTagDeclOrErr);
1532}

1534ExpectedType
1535ASTNodeImporter::VisitPackExpansionType(const PackExpansionType *T) {
ExpectedType ToPatternOrErr = import(T->getPattern());
if (!ToPatternOrErr)
  return ToPatternOrErr.takeError();

return Importer.getToContext().getPackExpansionType(*ToPatternOrErr,
                                                    T->getNumExpansions(),
                                                    /*ExpactPack=*/false);
1543}

1545ExpectedType ASTNodeImporter::VisitDependentTemplateSpecializationType(
  const DependentTemplateSpecializationType *T) {
auto ToQualifierOrErr = import(T->getQualifier());
if (!ToQualifierOrErr)
  return ToQualifierOrErr.takeError();

IdentifierInfo *ToName = Importer.Import(T->getIdentifier());

SmallVector<TemplateArgument, 2> ToPack;
ToPack.reserve(T->getNumArgs());
if (Error Err = ImportTemplateArguments(
    T->getArgs(), T->getNumArgs(), ToPack))
  return std::move(Err);

return Importer.getToContext().getDependentTemplateSpecializationType(
    T->getKeyword(), *ToQualifierOrErr, ToName, ToPack);
1561}

1563ExpectedType
1564ASTNodeImporter::VisitDependentNameType(const DependentNameType *T) {
auto ToQualifierOrErr = import(T->getQualifier());
if (!ToQualifierOrErr)
  return ToQualifierOrErr.takeError();

IdentifierInfo *Name = Importer.Import(T->getIdentifier());

QualType Canon;
if (T != T->getCanonicalTypeInternal().getTypePtr()) {
  if (ExpectedType TyOrErr = import(T->getCanonicalTypeInternal()))
    Canon = (*TyOrErr).getCanonicalType();
  else
    return TyOrErr.takeError();
}

return Importer.getToContext().getDependentNameType(T->getKeyword(),
                                                    *ToQualifierOrErr,
                                                    Name, Canon);
1582}

1584ExpectedType
1585ASTNodeImporter::VisitObjCInterfaceType(const ObjCInterfaceType *T) {
Expected<ObjCInterfaceDecl *> ToDeclOrErr = import(T->getDecl());
if (!ToDeclOrErr)
  return ToDeclOrErr.takeError();

return Importer.getToContext().getObjCInterfaceType(*ToDeclOrErr);
1591}

1593ExpectedType ASTNodeImporter::VisitObjCObjectType(const ObjCObjectType *T) {
ExpectedType ToBaseTypeOrErr = import(T->getBaseType());
if (!ToBaseTypeOrErr)
  return ToBaseTypeOrErr.takeError();

SmallVector<QualType, 4> TypeArgs;
for (auto TypeArg : T->getTypeArgsAsWritten()) {
  if (ExpectedType TyOrErr = import(TypeArg))
    TypeArgs.push_back(*TyOrErr);
  else
    return TyOrErr.takeError();
}

SmallVector<ObjCProtocolDecl *, 4> Protocols;
for (auto *P : T->quals()) {
  if (Expected<ObjCProtocolDecl *> ProtocolOrErr = import(P))
    Protocols.push_back(*ProtocolOrErr);
  else
    return ProtocolOrErr.takeError();

}

return Importer.getToContext().getObjCObjectType(*ToBaseTypeOrErr, TypeArgs,
                                                 Protocols,
                                                 T->isKindOfTypeAsWritten());
1618}

1620ExpectedType
1621ASTNodeImporter::VisitObjCObjectPointerType(const ObjCObjectPointerType *T) {
ExpectedType ToPointeeTypeOrErr = import(T->getPointeeType());
if (!ToPointeeTypeOrErr)
  return ToPointeeTypeOrErr.takeError();

return Importer.getToContext().getObjCObjectPointerType(*ToPointeeTypeOrErr);
1627}

1629//----------------------------------------------------------------------------
1630// Import Declarations
1631//----------------------------------------------------------------------------
1632Error ASTNodeImporter::ImportDeclParts(
  NamedDecl *D, DeclContext *&DC, DeclContext *&LexicalDC,
  DeclarationName &Name, NamedDecl *&ToD, SourceLocation &Loc) {
// Check if RecordDecl is in FunctionDecl parameters to avoid infinite loop.
// example: int struct_in_proto(struct data_t{int a;int b;} *d);
// FIXME: We could support these constructs by importing a different type of
// this parameter and by importing the original type of the parameter only
// after the FunctionDecl is created. See
// VisitFunctionDecl::UsedDifferentProtoType.
DeclContext *OrigDC = D->getDeclContext();
FunctionDecl *FunDecl;
if (isa<RecordDecl>(D) && (FunDecl = dyn_cast<FunctionDecl>(OrigDC)) &&
    FunDecl->hasBody()) {
  auto getLeafPointeeType = [](const Type *T) {
    while (T->isPointerType() || T->isArrayType()) {
      T = T->getPointeeOrArrayElementType();
    }
    return T;
  };
  for (const ParmVarDecl *P : FunDecl->parameters()) {
    const Type *LeafT =
        getLeafPointeeType(P->getType().getCanonicalType().getTypePtr());
    auto *RT = dyn_cast<RecordType>(LeafT);
    if (RT && RT->getDecl() == D) {
      Importer.FromDiag(D->getLocation(), diag::err_unsupported_ast_node)
          << D->getDeclKindName();
      return make_error<ImportError>(ImportError::UnsupportedConstruct);
    }
  }
}

// Import the context of this declaration.
if (Error Err = ImportDeclContext(D, DC, LexicalDC))
  return Err;

// Import the name of this declaration.
if (Error Err = importInto(Name, D->getDeclName()))
  return Err;

// Import the location of this declaration.
if (Error Err = importInto(Loc, D->getLocation()))
  return Err;

ToD = cast_or_null<NamedDecl>(Importer.GetAlreadyImportedOrNull(D));
if (ToD)
  if (Error Err = ASTNodeImporter(*this).ImportDefinitionIfNeeded(D, ToD))
    return Err;

return Error::success();
1681}

1683Error ASTNodeImporter::ImportDeclParts(NamedDecl *D, DeclarationName &Name,
                                     NamedDecl *&ToD, SourceLocation &Loc) {

// Import the name of this declaration.
if (Error Err = importInto(Name, D->getDeclName()))
  return Err;

// Import the location of this declaration.
if (Error Err = importInto(Loc, D->getLocation()))
  return Err;

ToD = cast_or_null<NamedDecl>(Importer.GetAlreadyImportedOrNull(D));
if (ToD)
  if (Error Err = ASTNodeImporter(*this).ImportDefinitionIfNeeded(D, ToD))
    return Err;

return Error::success();
1700}

1702Error ASTNodeImporter::ImportDefinitionIfNeeded(Decl *FromD, Decl *ToD) {
if (!FromD)
  return Error::success();

if (!ToD)
  if (Error Err = importInto(ToD, FromD))
    return Err;

if (RecordDecl *FromRecord = dyn_cast<RecordDecl>(FromD)) {
  if (RecordDecl *ToRecord = cast<RecordDecl>(ToD)) {
    if (FromRecord->getDefinition() && FromRecord->isCompleteDefinition() &&
        !ToRecord->getDefinition()) {
      if (Error Err = ImportDefinition(FromRecord, ToRecord))
        return Err;
    }
  }
  return Error::success();
}

if (EnumDecl *FromEnum = dyn_cast<EnumDecl>(FromD)) {
  if (EnumDecl *ToEnum = cast<EnumDecl>(ToD)) {
    if (FromEnum->getDefinition() && !ToEnum->getDefinition()) {
      if (Error Err = ImportDefinition(FromEnum, ToEnum))
        return Err;
    }
  }
  return Error::success();
}

return Error::success();
1732}

1734Error
1735ASTNodeImporter::ImportDeclarationNameLoc(
  const DeclarationNameInfo &From, DeclarationNameInfo& To) {
// NOTE: To.Name and To.Loc are already imported.
// We only have to import To.LocInfo.
switch (To.getName().getNameKind()) {
case DeclarationName::Identifier:
case DeclarationName::ObjCZeroArgSelector:
case DeclarationName::ObjCOneArgSelector:
case DeclarationName::ObjCMultiArgSelector:
case DeclarationName::CXXUsingDirective:
case DeclarationName::CXXDeductionGuideName:
  return Error::success();

case DeclarationName::CXXOperatorName: {
  if (auto ToRangeOrErr = import(From.getCXXOperatorNameRange()))
    To.setCXXOperatorNameRange(*ToRangeOrErr);
  else
    return ToRangeOrErr.takeError();
  return Error::success();
}
case DeclarationName::CXXLiteralOperatorName: {
  if (ExpectedSLoc LocOrErr = import(From.getCXXLiteralOperatorNameLoc()))
    To.setCXXLiteralOperatorNameLoc(*LocOrErr);
  else
    return LocOrErr.takeError();
  return Error::success();
}
case DeclarationName::CXXConstructorName:
case DeclarationName::CXXDestructorName:
case DeclarationName::CXXConversionFunctionName: {
  if (auto ToTInfoOrErr = import(From.getNamedTypeInfo()))
    To.setNamedTypeInfo(*ToTInfoOrErr);
  else
    return ToTInfoOrErr.takeError();
  return Error::success();
}
}
llvm_unreachable("Unknown name kind.")__builtin_unreachable();
1773}

1775Error
1776ASTNodeImporter::ImportDeclContext(DeclContext *FromDC, bool ForceImport) {
if (Importer.isMinimalImport() && !ForceImport) {
  auto ToDCOrErr = Importer.ImportContext(FromDC);
  return ToDCOrErr.takeError();
}

// We use strict error handling in case of records and enums, but not
// with e.g. namespaces.
//
// FIXME Clients of the ASTImporter should be able to choose an
// appropriate error handling strategy for their needs.  For instance,
// they may not want to mark an entire namespace as erroneous merely
// because there is an ODR error with two typedefs.  As another example,
// the client may allow EnumConstantDecls with same names but with
// different values in two distinct translation units.
bool AccumulateChildErrors = isa<TagDecl>(FromDC);

Error ChildErrors = Error::success();
for (auto *From : FromDC->decls()) {
  ExpectedDecl ImportedOrErr = import(From);

  // If we are in the process of ImportDefinition(...) for a RecordDecl we
  // want to make sure that we are also completing each FieldDecl. There
  // are currently cases where this does not happen and this is correctness
  // fix since operations such as code generation will expect this to be so.
  if (ImportedOrErr) {
    FieldDecl *FieldFrom = dyn_cast_or_null<FieldDecl>(From);
    Decl *ImportedDecl = *ImportedOrErr;
    FieldDecl *FieldTo = dyn_cast_or_null<FieldDecl>(ImportedDecl);
    if (FieldFrom && FieldTo) {
      RecordDecl *FromRecordDecl = nullptr;
      RecordDecl *ToRecordDecl = nullptr;
      // If we have a field that is an ArrayType we need to check if the array
      // element is a RecordDecl and if so we need to import the defintion.
      if (FieldFrom->getType()->isArrayType()) {
        // getBaseElementTypeUnsafe(...) handles multi-dimensonal arrays for us.
        FromRecordDecl = FieldFrom->getType()->getBaseElementTypeUnsafe()->getAsRecordDecl();
        ToRecordDecl = FieldTo->getType()->getBaseElementTypeUnsafe()->getAsRecordDecl();
      }

      if (!FromRecordDecl || !ToRecordDecl) {
        const RecordType *RecordFrom =
            FieldFrom->getType()->getAs<RecordType>();
        const RecordType *RecordTo = FieldTo->getType()->getAs<RecordType>();

        if (RecordFrom && RecordTo) {
          FromRecordDecl = RecordFrom->getDecl();
          ToRecordDecl = RecordTo->getDecl();
        }
      }

      if (FromRecordDecl && ToRecordDecl) {
        if (FromRecordDecl->isCompleteDefinition() &&
            !ToRecordDecl->isCompleteDefinition()) {
          Error Err = ImportDefinition(FromRecordDecl, ToRecordDecl);

          if (Err && AccumulateChildErrors)
            ChildErrors =  joinErrors(std::move(ChildErrors), std::move(Err));
          else
            consumeError(std::move(Err));
        }
      }
    }
  } else {
    if (AccumulateChildErrors)
      ChildErrors =
          joinErrors(std::move(ChildErrors), ImportedOrErr.takeError());
    else
      consumeError(ImportedOrErr.takeError());
  }
}

// We reorder declarations in RecordDecls because they may have another order
// in the "to" context than they have in the "from" context. This may happen
// e.g when we import a class like this:
//    struct declToImport {
//        int a = c + b;
//        int b = 1;
//        int c = 2;
//    };
// During the import of `a` we import first the dependencies in sequence,
// thus the order would be `c`, `b`, `a`. We will get the normal order by
// first removing the already imported members and then adding them in the
// order as they apper in the "from" context.
//
// Keeping field order is vital because it determines structure layout.
//
// Here and below, we cannot call field_begin() method and its callers on
// ToDC if it has an external storage. Calling field_begin() will
// automatically load all the fields by calling
// LoadFieldsFromExternalStorage(). LoadFieldsFromExternalStorage() would
// call ASTImporter::Import(). This is because the ExternalASTSource
// interface in LLDB is implemented by the means of the ASTImporter. However,
// calling an import at this point would result in an uncontrolled import, we
// must avoid that.
const auto *FromRD = dyn_cast<RecordDecl>(FromDC);
if (!FromRD)
  return ChildErrors;

auto ToDCOrErr = Importer.ImportContext(FromDC);
if (!ToDCOrErr) {
  consumeError(std::move(ChildErrors));
  return ToDCOrErr.takeError();
}

DeclContext *ToDC = *ToDCOrErr;
// Remove all declarations, which may be in wrong order in the
// lexical DeclContext and then add them in the proper order.
for (auto *D : FromRD->decls()) {
  if (isa<FieldDecl>(D) || isa<IndirectFieldDecl>(D) || isa<FriendDecl>(D)) {
    assert(D && "DC contains a null decl")((void)0);
    Decl *ToD = Importer.GetAlreadyImportedOrNull(D);
    // Remove only the decls which we successfully imported.
    if (ToD) {
      assert(ToDC == ToD->getLexicalDeclContext() && ToDC->containsDecl(ToD))((void)0);
      // Remove the decl from its wrong place in the linked list.
      ToDC->removeDecl(ToD);
      // Add the decl to the end of the linked list.
      // This time it will be at the proper place because the enclosing for
      // loop iterates in the original (good) order of the decls.
      ToDC->addDeclInternal(ToD);
    }
  }
}

return ChildErrors;
1902}

1904Error ASTNodeImporter::ImportDeclContext(
  Decl *FromD, DeclContext *&ToDC, DeclContext *&ToLexicalDC) {
auto ToDCOrErr = Importer.ImportContext(FromD->getDeclContext());
if (!ToDCOrErr)
  return ToDCOrErr.takeError();
ToDC = *ToDCOrErr;

if (FromD->getDeclContext() != FromD->getLexicalDeclContext()) {
  auto ToLexicalDCOrErr = Importer.ImportContext(
      FromD->getLexicalDeclContext());
  if (!ToLexicalDCOrErr)
    return ToLexicalDCOrErr.takeError();
  ToLexicalDC = *ToLexicalDCOrErr;
} else
  ToLexicalDC = ToDC;

return Error::success();
1921}

1923Error ASTNodeImporter::ImportImplicitMethods(
  const CXXRecordDecl *From, CXXRecordDecl *To) {
assert(From->isCompleteDefinition() && To->getDefinition() == To &&((void)0)
    "Import implicit methods to or from non-definition")((void)0);

for (CXXMethodDecl *FromM : From->methods())
  if (FromM->isImplicit()) {
    Expected<CXXMethodDecl *> ToMOrErr = import(FromM);
    if (!ToMOrErr)
      return ToMOrErr.takeError();
  }

return Error::success();
1936}

1938static Error setTypedefNameForAnonDecl(TagDecl *From, TagDecl *To,
                                     ASTImporter &Importer) {
if (TypedefNameDecl *FromTypedef = From->getTypedefNameForAnonDecl()) {
  if (ExpectedDecl ToTypedefOrErr = Importer.Import(FromTypedef))
    To->setTypedefNameForAnonDecl(cast<TypedefNameDecl>(*ToTypedefOrErr));
  else
    return ToTypedefOrErr.takeError();
}
return Error::success();
1947}

1949Error ASTNodeImporter::ImportDefinition(
  RecordDecl *From, RecordDecl *To, ImportDefinitionKind Kind) {
auto DefinitionCompleter = [To]() {
  // There are cases in LLDB when we first import a class without its
  // members. The class will have DefinitionData, but no members. Then,
  // importDefinition is called from LLDB, which tries to get the members, so
  // when we get here, the class already has the DefinitionData set, so we
  // must unset the CompleteDefinition here to be able to complete again the
  // definition.
  To->setCompleteDefinition(false);
  To->completeDefinition();
};

if (To->getDefinition() || To->isBeingDefined()) {
  if (Kind == IDK_Everything ||
      // In case of lambdas, the class already has a definition ptr set, but
      // the contained decls are not imported yet. Also, isBeingDefined was
      // set in CXXRecordDecl::CreateLambda.  We must import the contained
      // decls here and finish the definition.
      (To->isLambda() && shouldForceImportDeclContext(Kind))) {
    if (To->isLambda()) {
      auto *FromCXXRD = cast<CXXRecordDecl>(From);
      SmallVector<LambdaCapture, 8> ToCaptures;
      ToCaptures.reserve(FromCXXRD->capture_size());
      for (const auto &FromCapture : FromCXXRD->captures()) {
        if (auto ToCaptureOrErr = import(FromCapture))
          ToCaptures.push_back(*ToCaptureOrErr);
        else
          return ToCaptureOrErr.takeError();
      }
      cast<CXXRecordDecl>(To)->setCaptures(Importer.getToContext(),
                                           ToCaptures);
    }

    Error Result = ImportDeclContext(From, /*ForceImport=*/true);
    // Finish the definition of the lambda, set isBeingDefined to false.
    if (To->isLambda())
      DefinitionCompleter();
    return Result;
  }

  return Error::success();
}

To->startDefinition();
// Complete the definition even if error is returned.
// The RecordDecl may be already part of the AST so it is better to
// have it in complete state even if something is wrong with it.
auto DefinitionCompleterScopeExit =
    llvm::make_scope_exit(DefinitionCompleter);

if (Error Err = setTypedefNameForAnonDecl(From, To, Importer))
  return Err;

// Add base classes.
auto *ToCXX = dyn_cast<CXXRecordDecl>(To);
auto *FromCXX = dyn_cast<CXXRecordDecl>(From);
if (ToCXX && FromCXX && ToCXX->dataPtr() && FromCXX->dataPtr()) {

  struct CXXRecordDecl::DefinitionData &ToData = ToCXX->data();
  struct CXXRecordDecl::DefinitionData &FromData = FromCXX->data();

  #define FIELD(Name, Width, Merge) \
  ToData.Name = FromData.Name;
  #include "clang/AST/CXXRecordDeclDefinitionBits.def"

  // Copy over the data stored in RecordDeclBits
  ToCXX->setArgPassingRestrictions(FromCXX->getArgPassingRestrictions());

  SmallVector<CXXBaseSpecifier *, 4> Bases;
  for (const auto &Base1 : FromCXX->bases()) {
    ExpectedType TyOrErr = import(Base1.getType());
    if (!TyOrErr)
      return TyOrErr.takeError();

    SourceLocation EllipsisLoc;
    if (Base1.isPackExpansion()) {
      if (ExpectedSLoc LocOrErr = import(Base1.getEllipsisLoc()))
        EllipsisLoc = *LocOrErr;
      else
        return LocOrErr.takeError();
    }

    // Ensure that we have a definition for the base.
    if (Error Err =
        ImportDefinitionIfNeeded(Base1.getType()->getAsCXXRecordDecl()))
      return Err;

    auto RangeOrErr = import(Base1.getSourceRange());
    if (!RangeOrErr)
      return RangeOrErr.takeError();

    auto TSIOrErr = import(Base1.getTypeSourceInfo());
    if (!TSIOrErr)
      return TSIOrErr.takeError();

    Bases.push_back(
        new (Importer.getToContext()) CXXBaseSpecifier(
            *RangeOrErr,
            Base1.isVirtual(),
            Base1.isBaseOfClass(),
            Base1.getAccessSpecifierAsWritten(),
            *TSIOrErr,
            EllipsisLoc));
  }
  if (!Bases.empty())
    ToCXX->setBases(Bases.data(), Bases.size());
}

if (shouldForceImportDeclContext(Kind))
  if (Error Err = ImportDeclContext(From, /*ForceImport=*/true))
    return Err;

return Error::success();
2063}

2065Error ASTNodeImporter::ImportInitializer(VarDecl *From, VarDecl *To) {
if (To->getAnyInitializer())
  return Error::success();

Expr *FromInit = From->getInit();
if (!FromInit)
  return Error::success();

ExpectedExpr ToInitOrErr = import(FromInit);
if (!ToInitOrErr)
  return ToInitOrErr.takeError();

To->setInit(*ToInitOrErr);
if (EvaluatedStmt *FromEval = From->getEvaluatedStmt()) {
  EvaluatedStmt *ToEval = To->ensureEvaluatedStmt();
  ToEval->HasConstantInitialization = FromEval->HasConstantInitialization;
  ToEval->HasConstantDestruction = FromEval->HasConstantDestruction;
  // FIXME: Also import the initializer value.
}

// FIXME: Other bits to merge?
return Error::success();
2087}

2089Error ASTNodeImporter::ImportDefinition(
  EnumDecl *From, EnumDecl *To, ImportDefinitionKind Kind) {
if (To->getDefinition() || To->isBeingDefined()) {
  if (Kind == IDK_Everything)
    return ImportDeclContext(From, /*ForceImport=*/true);
  return Error::success();
}

To->startDefinition();

if (Error Err = setTypedefNameForAnonDecl(From, To, Importer))
  return Err;

ExpectedType ToTypeOrErr =
    import(Importer.getFromContext().getTypeDeclType(From));
if (!ToTypeOrErr)
  return ToTypeOrErr.takeError();

ExpectedType ToPromotionTypeOrErr = import(From->getPromotionType());
if (!ToPromotionTypeOrErr)
  return ToPromotionTypeOrErr.takeError();

if (shouldForceImportDeclContext(Kind))
  if (Error Err = ImportDeclContext(From, /*ForceImport=*/true))
    return Err;

// FIXME: we might need to merge the number of positive or negative bits
// if the enumerator lists don't match.
To->completeDefinition(*ToTypeOrErr, *ToPromotionTypeOrErr,
                       From->getNumPositiveBits(),
                       From->getNumNegativeBits());
return Error::success();
2121}

2123Error ASTNodeImporter::ImportTemplateArguments(
  const TemplateArgument *FromArgs, unsigned NumFromArgs,
  SmallVectorImpl<TemplateArgument> &ToArgs) {
for (unsigned I = 0; I != NumFromArgs; ++I) {
  if (auto ToOrErr = import(FromArgs[I]))
    ToArgs.push_back(*ToOrErr);
  else
    return ToOrErr.takeError();
}

return Error::success();
2134}

2136// FIXME: Do not forget to remove this and use only 'import'.
2137Expected<TemplateArgument>
2138ASTNodeImporter::ImportTemplateArgument(const TemplateArgument &From) {
return import(From);
2140}

2142template <typename InContainerTy>
2143Error ASTNodeImporter::ImportTemplateArgumentListInfo(
  const InContainerTy &Container, TemplateArgumentListInfo &ToTAInfo) {
for (const auto &FromLoc : Container) {
  if (auto ToLocOrErr = import(FromLoc))
    ToTAInfo.addArgument(*ToLocOrErr);
  else
    return ToLocOrErr.takeError();
}
return Error::success();
2152}

2154static StructuralEquivalenceKind
2155getStructuralEquivalenceKind(const ASTImporter &Importer) {
return Importer.isMinimalImport() ? StructuralEquivalenceKind::Minimal
                                  : StructuralEquivalenceKind::Default;
2158}

2160bool ASTNodeImporter::IsStructuralMatch(Decl *From, Decl *To, bool Complain) {
StructuralEquivalenceContext Ctx(
    Importer.getFromContext(), Importer.getToContext(),
    Importer.getNonEquivalentDecls(), getStructuralEquivalenceKind(Importer),
    false, Complain);
return Ctx.IsEquivalent(From, To);
2166}

2168bool ASTNodeImporter::IsStructuralMatch(RecordDecl *FromRecord,
                                      RecordDecl *ToRecord, bool Complain) {
// Eliminate a potential failure point where we attempt to re-import
// something we're trying to import while completing ToRecord.
Decl *ToOrigin = Importer.GetOriginalDecl(ToRecord);
if (ToOrigin) {
  auto *ToOriginRecord = dyn_cast<RecordDecl>(ToOrigin);
  if (ToOriginRecord)
    ToRecord = ToOriginRecord;
}

StructuralEquivalenceContext Ctx(Importer.getFromContext(),
                                 ToRecord->getASTContext(),
                                 Importer.getNonEquivalentDecls(),
                                 getStructuralEquivalenceKind(Importer),
                                 false, Complain);
return Ctx.IsEquivalent(FromRecord, ToRecord);
2185}

2187bool ASTNodeImporter::IsStructuralMatch(VarDecl *FromVar, VarDecl *ToVar,
                                      bool Complain) {
StructuralEquivalenceContext Ctx(
    Importer.getFromContext(), Importer.getToContext(),
    Importer.getNonEquivalentDecls(), getStructuralEquivalenceKind(Importer),
    false, Complain);
return Ctx.IsEquivalent(FromVar, ToVar);
2194}

2196bool ASTNodeImporter::IsStructuralMatch(EnumDecl *FromEnum, EnumDecl *ToEnum) {
// Eliminate a potential failure point where we attempt to re-import
// something we're trying to import while completing ToEnum.
if (Decl *ToOrigin = Importer.GetOriginalDecl(ToEnum))
  if (auto *ToOriginEnum = dyn_cast<EnumDecl>(ToOrigin))
      ToEnum = ToOriginEnum;

StructuralEquivalenceContext Ctx(
    Importer.getFromContext(), Importer.getToContext(),
    Importer.getNonEquivalentDecls(), getStructuralEquivalenceKind(Importer));
return Ctx.IsEquivalent(FromEnum, ToEnum);
2207}

2209bool ASTNodeImporter::IsStructuralMatch(FunctionTemplateDecl *From,
                                      FunctionTemplateDecl *To) {
StructuralEquivalenceContext Ctx(
    Importer.getFromContext(), Importer.getToContext(),
    Importer.getNonEquivalentDecls(), getStructuralEquivalenceKind(Importer),
    false, false);
return Ctx.IsEquivalent(From, To);
2216}

2218bool ASTNodeImporter::IsStructuralMatch(FunctionDecl *From, FunctionDecl *To) {
StructuralEquivalenceContext Ctx(
    Importer.getFromContext(), Importer.getToContext(),
    Importer.getNonEquivalentDecls(), getStructuralEquivalenceKind(Importer),
    false, false);
return Ctx.IsEquivalent(From, To);
2224}

2226bool ASTNodeImporter::IsStructuralMatch(EnumConstantDecl *FromEC,
                                      EnumConstantDecl *ToEC) {
const llvm::APSInt &FromVal = FromEC->getInitVal();
const llvm::APSInt &ToVal = ToEC->getInitVal();

return FromVal.isSigned() == ToVal.isSigned() &&
       FromVal.getBitWidth() == ToVal.getBitWidth() &&
       FromVal == ToVal;
2234}

2236bool ASTNodeImporter::IsStructuralMatch(ClassTemplateDecl *From,
                                      ClassTemplateDecl *To) {
StructuralEquivalenceContext Ctx(Importer.getFromContext(),
                                 Importer.getToContext(),
                                 Importer.getNonEquivalentDecls(),
                                 getStructuralEquivalenceKind(Importer));
return Ctx.IsEquivalent(From, To);
2243}

2245bool ASTNodeImporter::IsStructuralMatch(VarTemplateDecl *From,
                                      VarTemplateDecl *To) {
StructuralEquivalenceContext Ctx(Importer.getFromContext(),
                                 Importer.getToContext(),
                                 Importer.getNonEquivalentDecls(),
                                 getStructuralEquivalenceKind(Importer));
return Ctx.IsEquivalent(From, To);
2252}

2254ExpectedDecl ASTNodeImporter::VisitDecl(Decl *D) {
Importer.FromDiag(D->getLocation(), diag::err_unsupported_ast_node)
  << D->getDeclKindName();
return make_error<ImportError>(ImportError::UnsupportedConstruct);
2258}

2260ExpectedDecl ASTNodeImporter::VisitImportDecl(ImportDecl *D) {
Importer.FromDiag(D->getLocation(), diag::err_unsupported_ast_node)
    << D->getDeclKindName();
return make_error<ImportError>(ImportError::UnsupportedConstruct);
2264}

2266ExpectedDecl ASTNodeImporter::VisitEmptyDecl(EmptyDecl *D) {
// Import the context of this declaration.
DeclContext *DC, *LexicalDC;
if (Error Err = ImportDeclContext(D, DC, LexicalDC))
  return std::move(Err);

// Import the location of this declaration.
ExpectedSLoc LocOrErr = import(D->getLocation());
if (!LocOrErr)
  return LocOrErr.takeError();

EmptyDecl *ToD;
if (GetImportedOrCreateDecl(ToD, D, Importer.getToContext(), DC, *LocOrErr))
  return ToD;

ToD->setLexicalDeclContext(LexicalDC);
LexicalDC->addDeclInternal(ToD);
return ToD;
2284}

2286ExpectedDecl ASTNodeImporter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
TranslationUnitDecl *ToD =
  Importer.getToContext().getTranslationUnitDecl();

Importer.MapImported(D, ToD);

return ToD;
2293}

2295ExpectedDecl ASTNodeImporter::VisitBindingDecl(BindingDecl *D) {
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToND;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToND, Loc))
  return std::move(Err);
if (ToND)
  return ToND;

BindingDecl *ToD;
if (GetImportedOrCreateDecl(ToD, D, Importer.getToContext(), DC, Loc,
                            Name.getAsIdentifierInfo()))
  return ToD;

Error Err = Error::success();
QualType ToType = importChecked(Err, D->getType());
Expr *ToBinding = importChecked(Err, D->getBinding());
ValueDecl *ToDecomposedDecl = importChecked(Err, D->getDecomposedDecl());
if (Err)
  return std::move(Err);

ToD->setBinding(ToType, ToBinding);
ToD->setDecomposedDecl(ToDecomposedDecl);
addDeclToContexts(D, ToD);

return ToD;
2322}

2324ExpectedDecl ASTNodeImporter::VisitAccessSpecDecl(AccessSpecDecl *D) {
ExpectedSLoc LocOrErr = import(D->getLocation());
if (!LocOrErr)
  return LocOrErr.takeError();
auto ColonLocOrErr = import(D->getColonLoc());
if (!ColonLocOrErr)
  return ColonLocOrErr.takeError();

// Import the context of this declaration.
auto DCOrErr = Importer.ImportContext(D->getDeclContext());
if (!DCOrErr)
  return DCOrErr.takeError();
DeclContext *DC = *DCOrErr;

AccessSpecDecl *ToD;
if (GetImportedOrCreateDecl(ToD, D, Importer.getToContext(), D->getAccess(),
                            DC, *LocOrErr, *ColonLocOrErr))
  return ToD;

// Lexical DeclContext and Semantic DeclContext
// is always the same for the accessSpec.
ToD->setLexicalDeclContext(DC);
DC->addDeclInternal(ToD);

return ToD;
2349}

2351ExpectedDecl ASTNodeImporter::VisitStaticAssertDecl(StaticAssertDecl *D) {
auto DCOrErr = Importer.ImportContext(D->getDeclContext());
if (!DCOrErr)
  return DCOrErr.takeError();
DeclContext *DC = *DCOrErr;
DeclContext *LexicalDC = DC;

Error Err = Error::success();
auto ToLocation = importChecked(Err, D->getLocation());
auto ToRParenLoc = importChecked(Err, D->getRParenLoc());
auto ToAssertExpr = importChecked(Err, D->getAssertExpr());
auto ToMessage = importChecked(Err, D->getMessage());
if (Err)
  return std::move(Err);

StaticAssertDecl *ToD;
if (GetImportedOrCreateDecl(
    ToD, D, Importer.getToContext(), DC, ToLocation, ToAssertExpr, ToMessage,
    ToRParenLoc, D->isFailed()))
  return ToD;

ToD->setLexicalDeclContext(LexicalDC);
LexicalDC->addDeclInternal(ToD);
return ToD;
2375}

2377ExpectedDecl ASTNodeImporter::VisitNamespaceDecl(NamespaceDecl *D) {
// Import the major distinguishing characteristics of this namespace.
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

NamespaceDecl *MergeWithNamespace = nullptr;
if (!Name) {
  // This is an anonymous namespace. Adopt an existing anonymous
  // namespace if we can.
  // FIXME: Not testable.
  if (auto *TU = dyn_cast<TranslationUnitDecl>(DC))
    MergeWithNamespace = TU->getAnonymousNamespace();
  else
    MergeWithNamespace = cast<NamespaceDecl>(DC)->getAnonymousNamespace();
} else {
  SmallVector<NamedDecl *, 4> ConflictingDecls;
  auto FoundDecls = Importer.findDeclsInToCtx(DC, Name);
  for (auto *FoundDecl : FoundDecls) {
    if (!FoundDecl->isInIdentifierNamespace(Decl::IDNS_Namespace))
      continue;

    if (auto *FoundNS = dyn_cast<NamespaceDecl>(FoundDecl)) {
      MergeWithNamespace = FoundNS;
      ConflictingDecls.clear();
      break;
    }

    ConflictingDecls.push_back(FoundDecl);
  }

  if (!ConflictingDecls.empty()) {
    ExpectedName NameOrErr = Importer.HandleNameConflict(
        Name, DC, Decl::IDNS_Namespace, ConflictingDecls.data(),
        ConflictingDecls.size());
    if (NameOrErr)
      Name = NameOrErr.get();
    else
      return NameOrErr.takeError();
  }
}

ExpectedSLoc BeginLocOrErr = import(D->getBeginLoc());
if (!BeginLocOrErr)
  return BeginLocOrErr.takeError();
ExpectedSLoc RBraceLocOrErr = import(D->getRBraceLoc());
if (!RBraceLocOrErr)
  return RBraceLocOrErr.takeError();

// Create the "to" namespace, if needed.
NamespaceDecl *ToNamespace = MergeWithNamespace;
if (!ToNamespace) {
  if (GetImportedOrCreateDecl(
          ToNamespace, D, Importer.getToContext(), DC, D->isInline(),
          *BeginLocOrErr, Loc, Name.getAsIdentifierInfo(),
          /*PrevDecl=*/nullptr))
    return ToNamespace;
  ToNamespace->setRBraceLoc(*RBraceLocOrErr);
  ToNamespace->setLexicalDeclContext(LexicalDC);
  LexicalDC->addDeclInternal(ToNamespace);

  // If this is an anonymous namespace, register it as the anonymous
  // namespace within its context.
  if (!Name) {
    if (auto *TU = dyn_cast<TranslationUnitDecl>(DC))
      TU->setAnonymousNamespace(ToNamespace);
    else
      cast<NamespaceDecl>(DC)->setAnonymousNamespace(ToNamespace);
  }
}
Importer.MapImported(D, ToNamespace);

if (Error Err = ImportDeclContext(D))
  return std::move(Err);

return ToNamespace;
2458}

2460ExpectedDecl ASTNodeImporter::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
// Import the major distinguishing characteristics of this namespace.
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *LookupD;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, LookupD, Loc))
  return std::move(Err);
if (LookupD)
  return LookupD;

// NOTE: No conflict resolution is done for namespace aliases now.

Error Err = Error::success();
auto ToNamespaceLoc = importChecked(Err, D->getNamespaceLoc());
auto ToAliasLoc = importChecked(Err, D->getAliasLoc());
auto ToQualifierLoc = importChecked(Err, D->getQualifierLoc());
auto ToTargetNameLoc = importChecked(Err, D->getTargetNameLoc());
auto ToNamespace = importChecked(Err, D->getNamespace());
if (Err)
  return std::move(Err);

IdentifierInfo *ToIdentifier = Importer.Import(D->getIdentifier());

NamespaceAliasDecl *ToD;
if (GetImportedOrCreateDecl(
    ToD, D, Importer.getToContext(), DC, ToNamespaceLoc, ToAliasLoc,
    ToIdentifier, ToQualifierLoc, ToTargetNameLoc, ToNamespace))
  return ToD;

ToD->setLexicalDeclContext(LexicalDC);
LexicalDC->addDeclInternal(ToD);

return ToD;
2494}

2496ExpectedDecl
2497ASTNodeImporter::VisitTypedefNameDecl(TypedefNameDecl *D, bool IsAlias) {
// Import the major distinguishing characteristics of this typedef.
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD;
// Do not import the DeclContext, we will import it once the TypedefNameDecl
// is created.
if (Error Err = ImportDeclParts(D, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

DeclContext *DC = cast_or_null<DeclContext>(
    Importer.GetAlreadyImportedOrNull(cast<Decl>(D->getDeclContext())));
DeclContext *LexicalDC =
    cast_or_null<DeclContext>(Importer.GetAlreadyImportedOrNull(
        cast<Decl>(D->getLexicalDeclContext())));

// If this typedef is not in block scope, determine whether we've
// seen a typedef with the same name (that we can merge with) or any
// other entity by that name (which name lookup could conflict with).
// Note: Repeated typedefs are not valid in C99:
// 'typedef int T; typedef int T;' is invalid
// We do not care about this now.
if (DC && !DC->isFunctionOrMethod()) {
  SmallVector<NamedDecl *, 4> ConflictingDecls;
  unsigned IDNS = Decl::IDNS_Ordinary;
  auto FoundDecls = Importer.findDeclsInToCtx(DC, Name);
  for (auto *FoundDecl : FoundDecls) {
    if (!FoundDecl->isInIdentifierNamespace(IDNS))
      continue;
    if (auto *FoundTypedef = dyn_cast<TypedefNameDecl>(FoundDecl)) {
      if (!hasSameVisibilityContextAndLinkage(FoundTypedef, D))
        continue;

      QualType FromUT = D->getUnderlyingType();
      QualType FoundUT = FoundTypedef->getUnderlyingType();
      if (Importer.IsStructurallyEquivalent(FromUT, FoundUT)) {
        // If the "From" context has a complete underlying type but we
        // already have a complete underlying type then return with that.
        if (!FromUT->isIncompleteType() && !FoundUT->isIncompleteType())
          return Importer.MapImported(D, FoundTypedef);
        // FIXME Handle redecl chain. When you do that make consistent changes
        // in ASTImporterLookupTable too.
      } else {
        ConflictingDecls.push_back(FoundDecl);
      }
    }
  }

  if (!ConflictingDecls.empty()) {
    ExpectedName NameOrErr = Importer.HandleNameConflict(
        Name, DC, IDNS, ConflictingDecls.data(), ConflictingDecls.size());
    if (NameOrErr)
      Name = NameOrErr.get();
    else
      return NameOrErr.takeError();
  }
}

Error Err = Error::success();
auto ToUnderlyingType = importChecked(Err, D->getUnderlyingType());
auto ToTypeSourceInfo = importChecked(Err, D->getTypeSourceInfo());
auto ToBeginLoc = importChecked(Err, D->getBeginLoc());
if (Err)
  return std::move(Err);

// Create the new typedef node.
// FIXME: ToUnderlyingType is not used.
(void)ToUnderlyingType;
TypedefNameDecl *ToTypedef;
if (IsAlias) {
  if (GetImportedOrCreateDecl<TypeAliasDecl>(
      ToTypedef, D, Importer.getToContext(), DC, ToBeginLoc, Loc,
      Name.getAsIdentifierInfo(), ToTypeSourceInfo))
    return ToTypedef;
} else if (GetImportedOrCreateDecl<TypedefDecl>(
    ToTypedef, D, Importer.getToContext(), DC, ToBeginLoc, Loc,
    Name.getAsIdentifierInfo(), ToTypeSourceInfo))
  return ToTypedef;

// Import the DeclContext and set it to the Typedef.
if ((Err = ImportDeclContext(D, DC, LexicalDC)))
  return std::move(Err);
ToTypedef->setDeclContext(DC);
ToTypedef->setLexicalDeclContext(LexicalDC);
// Add to the lookupTable because we could not do that in MapImported.
Importer.AddToLookupTable(ToTypedef);

ToTypedef->setAccess(D->getAccess());

// Templated declarations should not appear in DeclContext.
TypeAliasDecl *FromAlias = IsAlias ? cast<TypeAliasDecl>(D) : nullptr;
if (!FromAlias || !FromAlias->getDescribedAliasTemplate())
  LexicalDC->addDeclInternal(ToTypedef);

return ToTypedef;
2594}

2596ExpectedDecl ASTNodeImporter::VisitTypedefDecl(TypedefDecl *D) {
return VisitTypedefNameDecl(D, /*IsAlias=*/false);
2598}

2600ExpectedDecl ASTNodeImporter::VisitTypeAliasDecl(TypeAliasDecl *D) {
return VisitTypedefNameDecl(D, /*IsAlias=*/true);
2602}

2604ExpectedDecl
2605ASTNodeImporter::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) {
// Import the major distinguishing characteristics of this typedef.
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *FoundD;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, FoundD, Loc))
  return std::move(Err);
if (FoundD)
  return FoundD;

// If this typedef is not in block scope, determine whether we've
// seen a typedef with the same name (that we can merge with) or any
// other entity by that name (which name lookup could conflict with).
if (!DC->isFunctionOrMethod()) {
  SmallVector<NamedDecl *, 4> ConflictingDecls;
  unsigned IDNS = Decl::IDNS_Ordinary;
  auto FoundDecls = Importer.findDeclsInToCtx(DC, Name);
  for (auto *FoundDecl : FoundDecls) {
    if (!FoundDecl->isInIdentifierNamespace(IDNS))
      continue;
    if (auto *FoundAlias = dyn_cast<TypeAliasTemplateDecl>(FoundDecl))
      return Importer.MapImported(D, FoundAlias);
    ConflictingDecls.push_back(FoundDecl);
  }

  if (!ConflictingDecls.empty()) {
    ExpectedName NameOrErr = Importer.HandleNameConflict(
        Name, DC, IDNS, ConflictingDecls.data(), ConflictingDecls.size());
    if (NameOrErr)
      Name = NameOrErr.get();
    else
      return NameOrErr.takeError();
  }
}

Error Err = Error::success();
auto ToTemplateParameters = importChecked(Err, D->getTemplateParameters());
auto ToTemplatedDecl = importChecked(Err, D->getTemplatedDecl());
if (Err)
  return std::move(Err);

TypeAliasTemplateDecl *ToAlias;
if (GetImportedOrCreateDecl(ToAlias, D, Importer.getToContext(), DC, Loc,
                            Name, ToTemplateParameters, ToTemplatedDecl))
  return ToAlias;

ToTemplatedDecl->setDescribedAliasTemplate(ToAlias);

ToAlias->setAccess(D->getAccess());
ToAlias->setLexicalDeclContext(LexicalDC);
LexicalDC->addDeclInternal(ToAlias);
if (DC != Importer.getToContext().getTranslationUnitDecl())
  updateLookupTableForTemplateParameters(*ToTemplateParameters);
return ToAlias;
2660}

2662ExpectedDecl ASTNodeImporter::VisitLabelDecl(LabelDecl *D) {
// Import the major distinguishing characteristics of this label.
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

assert(LexicalDC->isFunctionOrMethod())((void)0);

LabelDecl *ToLabel;
if (D->isGnuLocal()) {
  ExpectedSLoc BeginLocOrErr = import(D->getBeginLoc());
  if (!BeginLocOrErr)
    return BeginLocOrErr.takeError();
  if (GetImportedOrCreateDecl(ToLabel, D, Importer.getToContext(), DC, Loc,
                              Name.getAsIdentifierInfo(), *BeginLocOrErr))
    return ToLabel;

} else {
  if (GetImportedOrCreateDecl(ToLabel, D, Importer.getToContext(), DC, Loc,
                              Name.getAsIdentifierInfo()))
    return ToLabel;

}

Expected<LabelStmt *> ToStmtOrErr = import(D->getStmt());
if (!ToStmtOrErr)
  return ToStmtOrErr.takeError();

ToLabel->setStmt(*ToStmtOrErr);
ToLabel->setLexicalDeclContext(LexicalDC);
LexicalDC->addDeclInternal(ToLabel);
return ToLabel;
2699}

2701ExpectedDecl ASTNodeImporter::VisitEnumDecl(EnumDecl *D) {
// Import the major distinguishing characteristics of this enum.
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

// Figure out what enum name we're looking for.
unsigned IDNS = Decl::IDNS_Tag;
DeclarationName SearchName = Name;
if (!SearchName && D->getTypedefNameForAnonDecl()) {
  if (Error Err = importInto(
      SearchName, D->getTypedefNameForAnonDecl()->getDeclName()))
    return std::move(Err);
  IDNS = Decl::IDNS_Ordinary;
} else if (Importer.getToContext().getLangOpts().CPlusPlus)
  IDNS |= Decl::IDNS_Ordinary;

// We may already have an enum of the same name; try to find and match it.
EnumDecl *PrevDecl = nullptr;
if (!DC->isFunctionOrMethod() && SearchName) {
  SmallVector<NamedDecl *, 4> ConflictingDecls;
  auto FoundDecls =
      Importer.findDeclsInToCtx(DC, SearchName);
  for (auto *FoundDecl : FoundDecls) {
    if (!FoundDecl->isInIdentifierNamespace(IDNS))
      continue;

    if (auto *Typedef = dyn_cast<TypedefNameDecl>(FoundDecl)) {
      if (const auto *Tag = Typedef->getUnderlyingType()->getAs<TagType>())
        FoundDecl = Tag->getDecl();
    }

    if (auto *FoundEnum = dyn_cast<EnumDecl>(FoundDecl)) {
      if (!hasSameVisibilityContextAndLinkage(FoundEnum, D))
        continue;
      if (IsStructuralMatch(D, FoundEnum)) {
        EnumDecl *FoundDef = FoundEnum->getDefinition();
        if (D->isThisDeclarationADefinition() && FoundDef)
          return Importer.MapImported(D, FoundDef);
        PrevDecl = FoundEnum->getMostRecentDecl();
        break;
      }
      ConflictingDecls.push_back(FoundDecl);
    }
  }

  if (!ConflictingDecls.empty()) {
    ExpectedName NameOrErr = Importer.HandleNameConflict(
        SearchName, DC, IDNS, ConflictingDecls.data(),
        ConflictingDecls.size());
    if (NameOrErr)
      Name = NameOrErr.get();
    else
      return NameOrErr.takeError();
  }
}

Error Err = Error::success();
auto ToBeginLoc = importChecked(Err, D->getBeginLoc());
auto ToQualifierLoc = importChecked(Err, D->getQualifierLoc());
auto ToIntegerType = importChecked(Err, D->getIntegerType());
auto ToBraceRange = importChecked(Err, D->getBraceRange());
if (Err)
  return std::move(Err);

// Create the enum declaration.
EnumDecl *D2;
if (GetImportedOrCreateDecl(
        D2, D, Importer.getToContext(), DC, ToBeginLoc,
        Loc, Name.getAsIdentifierInfo(), PrevDecl, D->isScoped(),
        D->isScopedUsingClassTag(), D->isFixed()))
  return D2;

D2->setQualifierInfo(ToQualifierLoc);
D2->setIntegerType(ToIntegerType);
D2->setBraceRange(ToBraceRange);
D2->setAccess(D->getAccess());
D2->setLexicalDeclContext(LexicalDC);
addDeclToContexts(D, D2);

if (MemberSpecializationInfo *MemberInfo = D->getMemberSpecializationInfo()) {
  TemplateSpecializationKind SK = MemberInfo->getTemplateSpecializationKind();
  EnumDecl *FromInst = D->getInstantiatedFromMemberEnum();
  if (Expected<EnumDecl *> ToInstOrErr = import(FromInst))
    D2->setInstantiationOfMemberEnum(*ToInstOrErr, SK);
  else
    return ToInstOrErr.takeError();
  if (ExpectedSLoc POIOrErr = import(MemberInfo->getPointOfInstantiation()))
    D2->getMemberSpecializationInfo()->setPointOfInstantiation(*POIOrErr);
  else
    return POIOrErr.takeError();
}

// Import the definition
if (D->isCompleteDefinition())
  if (Error Err = ImportDefinition(D, D2))
    return std::move(Err);

return D2;
2805}

2807ExpectedDecl ASTNodeImporter::VisitRecordDecl(RecordDecl *D) {
bool IsFriendTemplate = false;
if (auto *DCXX = dyn_cast<CXXRecordDecl>(D)) {
  IsFriendTemplate =
      DCXX->getDescribedClassTemplate() &&
      DCXX->getDescribedClassTemplate()->getFriendObjectKind() !=
          Decl::FOK_None;
}

// Import the major distinguishing characteristics of this record.
DeclContext *DC = nullptr, *LexicalDC = nullptr;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD = nullptr;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

// Figure out what structure name we're looking for.
unsigned IDNS = Decl::IDNS_Tag;
DeclarationName SearchName = Name;
if (!SearchName && D->getTypedefNameForAnonDecl()) {
  if (Error Err = importInto(
      SearchName, D->getTypedefNameForAnonDecl()->getDeclName()))
    return std::move(Err);
  IDNS = Decl::IDNS_Ordinary;
} else if (Importer.getToContext().getLangOpts().CPlusPlus)
  IDNS |= Decl::IDNS_Ordinary | Decl::IDNS_TagFriend;

// We may already have a record of the same name; try to find and match it.
RecordDecl *PrevDecl = nullptr;
if (!DC->isFunctionOrMethod() && !D->isLambda()) {
  SmallVector<NamedDecl *, 4> ConflictingDecls;
  auto FoundDecls =
      Importer.findDeclsInToCtx(DC, SearchName);
  if (!FoundDecls.empty()) {
    // We're going to have to compare D against potentially conflicting Decls,
    // so complete it.
    if (D->hasExternalLexicalStorage() && !D->isCompleteDefinition())
      D->getASTContext().getExternalSource()->CompleteType(D);
  }

  for (auto *FoundDecl : FoundDecls) {
    if (!FoundDecl->isInIdentifierNamespace(IDNS))
      continue;

    Decl *Found = FoundDecl;
    if (auto *Typedef = dyn_cast<TypedefNameDecl>(Found)) {
      if (const auto *Tag = Typedef->getUnderlyingType()->getAs<TagType>())
        Found = Tag->getDecl();
    }

    if (auto *FoundRecord = dyn_cast<RecordDecl>(Found)) {
      // Do not emit false positive diagnostic in case of unnamed
      // struct/union and in case of anonymous structs.  Would be false
      // because there may be several anonymous/unnamed structs in a class.
      // E.g. these are both valid:
      //  struct A { // unnamed structs
      //    struct { struct A *next; } entry0;
      //    struct { struct A *next; } entry1;
      //  };
      //  struct X { struct { int a; }; struct { int b; }; }; // anon structs
      if (!SearchName)
        if (!IsStructuralMatch(D, FoundRecord, false))
          continue;

      if (!hasSameVisibilityContextAndLinkage(FoundRecord, D))
        continue;

      if (IsStructuralMatch(D, FoundRecord)) {
        RecordDecl *FoundDef = FoundRecord->getDefinition();
        if (D->isThisDeclarationADefinition() && FoundDef) {
          // FIXME: Structural equivalence check should check for same
          // user-defined methods.
          Importer.MapImported(D, FoundDef);
          if (const auto *DCXX = dyn_cast<CXXRecordDecl>(D)) {
            auto *FoundCXX = dyn_cast<CXXRecordDecl>(FoundDef);
            assert(FoundCXX && "Record type mismatch")((void)0);

            if (!Importer.isMinimalImport())
              // FoundDef may not have every implicit method that D has
              // because implicit methods are created only if they are used.
              if (Error Err = ImportImplicitMethods(DCXX, FoundCXX))
                return std::move(Err);
          }
        }
        PrevDecl = FoundRecord->getMostRecentDecl();
        break;
      }
      ConflictingDecls.push_back(FoundDecl);
    } // kind is RecordDecl
  } // for

  if (!ConflictingDecls.empty() && SearchName) {
    ExpectedName NameOrErr = Importer.HandleNameConflict(
        SearchName, DC, IDNS, ConflictingDecls.data(),
        ConflictingDecls.size());
    if (NameOrErr)
      Name = NameOrErr.get();
    else
      return NameOrErr.takeError();
  }
}

ExpectedSLoc BeginLocOrErr = import(D->getBeginLoc());
if (!BeginLocOrErr)
  return BeginLocOrErr.takeError();

// Create the record declaration.
RecordDecl *D2 = nullptr;
CXXRecordDecl *D2CXX = nullptr;
if (auto *DCXX = dyn_cast<CXXRecordDecl>(D)) {
  if (DCXX->isLambda()) {
    auto TInfoOrErr = import(DCXX->getLambdaTypeInfo());
    if (!TInfoOrErr)
      return TInfoOrErr.takeError();
    if (GetImportedOrCreateSpecialDecl(
            D2CXX, CXXRecordDecl::CreateLambda, D, Importer.getToContext(),
            DC, *TInfoOrErr, Loc, DCXX->isDependentLambda(),
            DCXX->isGenericLambda(), DCXX->getLambdaCaptureDefault()))
      return D2CXX;
    ExpectedDecl CDeclOrErr = import(DCXX->getLambdaContextDecl());
    if (!CDeclOrErr)
      return CDeclOrErr.takeError();
    D2CXX->setLambdaMangling(DCXX->getLambdaManglingNumber(), *CDeclOrErr,
                             DCXX->hasKnownLambdaInternalLinkage());
    D2CXX->setDeviceLambdaManglingNumber(
        DCXX->getDeviceLambdaManglingNumber());
 } else if (DCXX->isInjectedClassName()) {
    // We have to be careful to do a similar dance to the one in
    // Sema::ActOnStartCXXMemberDeclarations
    const bool DelayTypeCreation = true;
    if (GetImportedOrCreateDecl(
            D2CXX, D, Importer.getToContext(), D->getTagKind(), DC,
            *BeginLocOrErr, Loc, Name.getAsIdentifierInfo(),
            cast_or_null<CXXRecordDecl>(PrevDecl), DelayTypeCreation))
      return D2CXX;
    Importer.getToContext().getTypeDeclType(
        D2CXX, dyn_cast<CXXRecordDecl>(DC));
  } else {
    if (GetImportedOrCreateDecl(D2CXX, D, Importer.getToContext(),
                                D->getTagKind(), DC, *BeginLocOrErr, Loc,
                                Name.getAsIdentifierInfo(),
                                cast_or_null<CXXRecordDecl>(PrevDecl)))
      return D2CXX;
  }

  D2 = D2CXX;
  D2->setAccess(D->getAccess());
  D2->setLexicalDeclContext(LexicalDC);
  addDeclToContexts(D, D2);

  if (ClassTemplateDecl *FromDescribed =
      DCXX->getDescribedClassTemplate()) {
    ClassTemplateDecl *ToDescribed;
    if (Error Err = importInto(ToDescribed, FromDescribed))
      return std::move(Err);
    D2CXX->setDescribedClassTemplate(ToDescribed);
    if (!DCXX->isInjectedClassName() && !IsFriendTemplate) {
      // In a record describing a template the type should be an
      // InjectedClassNameType (see Sema::CheckClassTemplate). Update the
      // previously set type to the correct value here (ToDescribed is not
      // available at record create).
      // FIXME: The previous type is cleared but not removed from
      // ASTContext's internal storage.
      CXXRecordDecl *Injected = nullptr;
      for (NamedDecl *Found : D2CXX->noload_lookup(Name)) {
        auto *Record = dyn_cast<CXXRecordDecl>(Found);
        if (Record && Record->isInjectedClassName()) {
          Injected = Record;
          break;
        }
      }
      // Create an injected type for the whole redecl chain.
      SmallVector<Decl *, 2> Redecls =
          getCanonicalForwardRedeclChain(D2CXX);
      for (auto *R : Redecls) {
        auto *RI = cast<CXXRecordDecl>(R);
        RI->setTypeForDecl(nullptr);
        // Below we create a new injected type and assign that to the
        // canonical decl, subsequent declarations in the chain will reuse
        // that type.
        Importer.getToContext().getInjectedClassNameType(
            RI, ToDescribed->getInjectedClassNameSpecialization());
      }
      // Set the new type for the previous injected decl too.
      if (Injected) {
        Injected->setTypeForDecl(nullptr);
        Importer.getToContext().getTypeDeclType(Injected, D2CXX);
      }
    }
  } else if (MemberSpecializationInfo *MemberInfo =
                 DCXX->getMemberSpecializationInfo()) {
      TemplateSpecializationKind SK =
          MemberInfo->getTemplateSpecializationKind();
      CXXRecordDecl *FromInst = DCXX->getInstantiatedFromMemberClass();

      if (Expected<CXXRecordDecl *> ToInstOrErr = import(FromInst))
        D2CXX->setInstantiationOfMemberClass(*ToInstOrErr, SK);
      else
        return ToInstOrErr.takeError();

      if (ExpectedSLoc POIOrErr =
          import(MemberInfo->getPointOfInstantiation()))
        D2CXX->getMemberSpecializationInfo()->setPointOfInstantiation(
          *POIOrErr);
      else
        return POIOrErr.takeError();
  }

} else {
  if (GetImportedOrCreateDecl(D2, D, Importer.getToContext(),
                              D->getTagKind(), DC, *BeginLocOrErr, Loc,
                              Name.getAsIdentifierInfo(), PrevDecl))
    return D2;
  D2->setLexicalDeclContext(LexicalDC);
  addDeclToContexts(D, D2);
}

if (auto BraceRangeOrErr = import(D->getBraceRange()))
  D2->setBraceRange(*BraceRangeOrErr);
else
  return BraceRangeOrErr.takeError();
if (auto QualifierLocOrErr = import(D->getQualifierLoc()))
  D2->setQualifierInfo(*QualifierLocOrErr);
else
  return QualifierLocOrErr.takeError();

if (D->isAnonymousStructOrUnion())
  D2->setAnonymousStructOrUnion(true);

if (D->isCompleteDefinition())
  if (Error Err = ImportDefinition(D, D2, IDK_Default))
    return std::move(Err);

return D2;
3044}

3046ExpectedDecl ASTNodeImporter::VisitEnumConstantDecl(EnumConstantDecl *D) {
// Import the major distinguishing characteristics of this enumerator.
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

// Determine whether there are any other declarations with the same name and
// in the same context.
if (!LexicalDC->isFunctionOrMethod()) {
  SmallVector<NamedDecl *, 4> ConflictingDecls;
  unsigned IDNS = Decl::IDNS_Ordinary;
  auto FoundDecls = Importer.findDeclsInToCtx(DC, Name);
  for (auto *FoundDecl : FoundDecls) {
    if (!FoundDecl->isInIdentifierNamespace(IDNS))
      continue;

    if (auto *FoundEnumConstant = dyn_cast<EnumConstantDecl>(FoundDecl)) {
      if (IsStructuralMatch(D, FoundEnumConstant))
        return Importer.MapImported(D, FoundEnumConstant);
      ConflictingDecls.push_back(FoundDecl);
    }
  }

  if (!ConflictingDecls.empty()) {
    ExpectedName NameOrErr = Importer.HandleNameConflict(
        Name, DC, IDNS, ConflictingDecls.data(), ConflictingDecls.size());
    if (NameOrErr)
      Name = NameOrErr.get();
    else
      return NameOrErr.takeError();
  }
}

ExpectedType TypeOrErr = import(D->getType());
if (!TypeOrErr)
  return TypeOrErr.takeError();

ExpectedExpr InitOrErr = import(D->getInitExpr());
if (!InitOrErr)
  return InitOrErr.takeError();

EnumConstantDecl *ToEnumerator;
if (GetImportedOrCreateDecl(
        ToEnumerator, D, Importer.getToContext(), cast<EnumDecl>(DC), Loc,
        Name.getAsIdentifierInfo(), *TypeOrErr, *InitOrErr, D->getInitVal()))
  return ToEnumerator;

ToEnumerator->setAccess(D->getAccess());
ToEnumerator->setLexicalDeclContext(LexicalDC);
LexicalDC->addDeclInternal(ToEnumerator);
return ToEnumerator;
3102}

3104Error ASTNodeImporter::ImportTemplateParameterLists(const DeclaratorDecl *FromD,
                                                  DeclaratorDecl *ToD) {
unsigned int Num = FromD->getNumTemplateParameterLists();
if (Num == 0)
  return Error::success();
SmallVector<TemplateParameterList *, 2> ToTPLists(Num);
for (unsigned int I = 0; I < Num; ++I)
  if (Expected<TemplateParameterList *> ToTPListOrErr =
          import(FromD->getTemplateParameterList(I)))
    ToTPLists[I] = *ToTPListOrErr;
  else
    return ToTPListOrErr.takeError();
ToD->setTemplateParameterListsInfo(Importer.ToContext, ToTPLists);
return Error::success();
3118}

3120Error ASTNodeImporter::ImportTemplateInformation(
  FunctionDecl *FromFD, FunctionDecl *ToFD) {
switch (FromFD->getTemplatedKind()) {
case FunctionDecl::TK_NonTemplate:
case FunctionDecl::TK_FunctionTemplate:
  return Error::success();

case FunctionDecl::TK_MemberSpecialization: {
  TemplateSpecializationKind TSK = FromFD->getTemplateSpecializationKind();

  if (Expected<FunctionDecl *> InstFDOrErr =
      import(FromFD->getInstantiatedFromMemberFunction()))
    ToFD->setInstantiationOfMemberFunction(*InstFDOrErr, TSK);
  else
    return InstFDOrErr.takeError();

  if (ExpectedSLoc POIOrErr = import(
      FromFD->getMemberSpecializationInfo()->getPointOfInstantiation()))
    ToFD->getMemberSpecializationInfo()->setPointOfInstantiation(*POIOrErr);
  else
    return POIOrErr.takeError();

  return Error::success();
}

case FunctionDecl::TK_FunctionTemplateSpecialization: {
  auto FunctionAndArgsOrErr =
      ImportFunctionTemplateWithTemplateArgsFromSpecialization(FromFD);
  if (!FunctionAndArgsOrErr)
    return FunctionAndArgsOrErr.takeError();

  TemplateArgumentList *ToTAList = TemplateArgumentList::CreateCopy(
        Importer.getToContext(), std::get<1>(*FunctionAndArgsOrErr));

  auto *FTSInfo = FromFD->getTemplateSpecializationInfo();
  TemplateArgumentListInfo ToTAInfo;
  const auto *FromTAArgsAsWritten = FTSInfo->TemplateArgumentsAsWritten;
  if (FromTAArgsAsWritten)
    if (Error Err = ImportTemplateArgumentListInfo(
        *FromTAArgsAsWritten, ToTAInfo))
      return Err;

  ExpectedSLoc POIOrErr = import(FTSInfo->getPointOfInstantiation());
  if (!POIOrErr)
    return POIOrErr.takeError();

  if (Error Err = ImportTemplateParameterLists(FromFD, ToFD))
    return Err;

  TemplateSpecializationKind TSK = FTSInfo->getTemplateSpecializationKind();
  ToFD->setFunctionTemplateSpecialization(
      std::get<0>(*FunctionAndArgsOrErr), ToTAList, /* InsertPos= */ nullptr,
      TSK, FromTAArgsAsWritten ? &ToTAInfo : nullptr, *POIOrErr);
  return Error::success();
}

case FunctionDecl::TK_DependentFunctionTemplateSpecialization: {
  auto *FromInfo = FromFD->getDependentSpecializationInfo();
  UnresolvedSet<8> TemplDecls;
  unsigned NumTemplates = FromInfo->getNumTemplates();
  for (unsigned I = 0; I < NumTemplates; I++) {
    if (Expected<FunctionTemplateDecl *> ToFTDOrErr =
        import(FromInfo->getTemplate(I)))
      TemplDecls.addDecl(*ToFTDOrErr);
    else
      return ToFTDOrErr.takeError();
  }

  // Import TemplateArgumentListInfo.
  TemplateArgumentListInfo ToTAInfo;
  if (Error Err = ImportTemplateArgumentListInfo(
      FromInfo->getLAngleLoc(), FromInfo->getRAngleLoc(),
      llvm::makeArrayRef(
          FromInfo->getTemplateArgs(), FromInfo->getNumTemplateArgs()),
      ToTAInfo))
    return Err;

  ToFD->setDependentTemplateSpecialization(Importer.getToContext(),
                                           TemplDecls, ToTAInfo);
  return Error::success();
}
}
llvm_unreachable("All cases should be covered!")__builtin_unreachable();
3203}

3205Expected<FunctionDecl *>
3206ASTNodeImporter::FindFunctionTemplateSpecialization(FunctionDecl *FromFD) {
auto FunctionAndArgsOrErr =
    ImportFunctionTemplateWithTemplateArgsFromSpecialization(FromFD);
if (!FunctionAndArgsOrErr)
  return FunctionAndArgsOrErr.takeError();

FunctionTemplateDecl *Template;
TemplateArgsTy ToTemplArgs;
std::tie(Template, ToTemplArgs) = *FunctionAndArgsOrErr;
void *InsertPos = nullptr;
auto *FoundSpec = Template->findSpecialization(ToTemplArgs, InsertPos);
return FoundSpec;
3218}

3220Error ASTNodeImporter::ImportFunctionDeclBody(FunctionDecl *FromFD,
                                            FunctionDecl *ToFD) {
if (Stmt *FromBody = FromFD->getBody()) {
  if (ExpectedStmt ToBodyOrErr = import(FromBody))
    ToFD->setBody(*ToBodyOrErr);
  else
    return ToBodyOrErr.takeError();
}
return Error::success();
3229}

3231// Returns true if the given D has a DeclContext up to the TranslationUnitDecl
3232// which is equal to the given DC.
3233static bool isAncestorDeclContextOf(const DeclContext *DC, const Decl *D) {
const DeclContext *DCi = D->getDeclContext();
while (DCi != D->getTranslationUnitDecl()) {
  if (DCi == DC)
    return true;
  DCi = DCi->getParent();
}
return false;
3241}

3243bool ASTNodeImporter::hasAutoReturnTypeDeclaredInside(FunctionDecl *D) {
QualType FromTy = D->getType();
const FunctionProtoType *FromFPT = FromTy->getAs<FunctionProtoType>();
assert(FromFPT && "Must be called on FunctionProtoType")((void)0);
if (AutoType *AutoT = FromFPT->getReturnType()->getContainedAutoType()) {
  QualType DeducedT = AutoT->getDeducedType();
  if (const RecordType *RecordT =
          DeducedT.isNull() ? nullptr : dyn_cast<RecordType>(DeducedT)) {
    RecordDecl *RD = RecordT->getDecl();
    assert(RD)((void)0);
    if (isAncestorDeclContextOf(D, RD)) {
      assert(RD->getLexicalDeclContext() == RD->getDeclContext())((void)0);
      return true;
    }
  }
}
if (const TypedefType *TypedefT =
        dyn_cast<TypedefType>(FromFPT->getReturnType())) {
  TypedefNameDecl *TD = TypedefT->getDecl();
  assert(TD)((void)0);
  if (isAncestorDeclContextOf(D, TD)) {
    assert(TD->getLexicalDeclContext() == TD->getDeclContext())((void)0);
    return true;
  }
}
return false;
3269}

3271ExplicitSpecifier
3272ASTNodeImporter::importExplicitSpecifier(Error &Err, ExplicitSpecifier ESpec) {
Expr *ExplicitExpr = ESpec.getExpr();
if (ExplicitExpr)
  ExplicitExpr = importChecked(Err, ESpec.getExpr());
return ExplicitSpecifier(ExplicitExpr, ESpec.getKind());
3277}

3279ExpectedDecl ASTNodeImporter::VisitFunctionDecl(FunctionDecl *D) {

SmallVector<Decl *, 2> Redecls = getCanonicalForwardRedeclChain(D);
auto RedeclIt = Redecls.begin();
// Import the first part of the decl chain. I.e. import all previous
// declarations starting from the canonical decl.
for (; RedeclIt != Redecls.end() && *RedeclIt != D; ++RedeclIt) {
  ExpectedDecl ToRedeclOrErr = import(*RedeclIt);
  if (!ToRedeclOrErr)
    return ToRedeclOrErr.takeError();
}
assert(*RedeclIt == D)((void)0);

// Import the major distinguishing characteristics of this function.
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

FunctionDecl *FoundByLookup = nullptr;
FunctionTemplateDecl *FromFT = D->getDescribedFunctionTemplate();

// If this is a function template specialization, then try to find the same
// existing specialization in the "to" context. The lookup below will not
// find any specialization, but would find the primary template; thus, we
// have to skip normal lookup in case of specializations.
// FIXME handle member function templates (TK_MemberSpecialization) similarly?
if (D->getTemplatedKind() ==
    FunctionDecl::TK_FunctionTemplateSpecialization) {
  auto FoundFunctionOrErr = FindFunctionTemplateSpecialization(D);
  if (!FoundFunctionOrErr)
    return FoundFunctionOrErr.takeError();
  if (FunctionDecl *FoundFunction = *FoundFunctionOrErr) {
    if (Decl *Def = FindAndMapDefinition(D, FoundFunction))
      return Def;
    FoundByLookup = FoundFunction;
  }
}
// Try to find a function in our own ("to") context with the same name, same
// type, and in the same context as the function we're importing.
else if (!LexicalDC->isFunctionOrMethod()) {
  SmallVector<NamedDecl *, 4> ConflictingDecls;
  unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_OrdinaryFriend;
  auto FoundDecls = Importer.findDeclsInToCtx(DC, Name);
  for (auto *FoundDecl : FoundDecls) {
    if (!FoundDecl->isInIdentifierNamespace(IDNS))
      continue;

    if (auto *FoundFunction = dyn_cast<FunctionDecl>(FoundDecl)) {
      if (!hasSameVisibilityContextAndLinkage(FoundFunction, D))
        continue;

      if (IsStructuralMatch(D, FoundFunction)) {
        if (Decl *Def = FindAndMapDefinition(D, FoundFunction))
          return Def;
        FoundByLookup = FoundFunction;
        break;
      }
      // FIXME: Check for overloading more carefully, e.g., by boosting
      // Sema::IsOverload out to the AST library.

      // Function overloading is okay in C++.
      if (Importer.getToContext().getLangOpts().CPlusPlus)
        continue;

      // Complain about inconsistent function types.
      Importer.ToDiag(Loc, diag::warn_odr_function_type_inconsistent)
          << Name << D->getType() << FoundFunction->getType();
      Importer.ToDiag(FoundFunction->getLocation(), diag::note_odr_value_here)
          << FoundFunction->getType();
      ConflictingDecls.push_back(FoundDecl);
    }
  }

  if (!ConflictingDecls.empty()) {
    ExpectedName NameOrErr = Importer.HandleNameConflict(
        Name, DC, IDNS, ConflictingDecls.data(), ConflictingDecls.size());
    if (NameOrErr)
      Name = NameOrErr.get();
    else
      return NameOrErr.takeError();
  }
}

// We do not allow more than one in-class declaration of a function. This is
// because AST clients like VTableBuilder asserts on this. VTableBuilder
// assumes there is only one in-class declaration. Building a redecl
// chain would result in more than one in-class declaration for
// overrides (even if they are part of the same redecl chain inside the
// derived class.)
if (FoundByLookup) {
  if (isa<CXXMethodDecl>(FoundByLookup)) {
    if (D->getLexicalDeclContext() == D->getDeclContext()) {
      if (!D->doesThisDeclarationHaveABody()) {
        if (FunctionTemplateDecl *DescribedD =
                D->getDescribedFunctionTemplate()) {
          // Handle a "templated" function together with its described
          // template. This avoids need for a similar check at import of the
          // described template.
          assert(FoundByLookup->getDescribedFunctionTemplate() &&((void)0)
                 "Templated function mapped to non-templated?")((void)0);
          Importer.MapImported(DescribedD,
                               FoundByLookup->getDescribedFunctionTemplate());
        }
        return Importer.MapImported(D, FoundByLookup);
      } else {
        // Let's continue and build up the redecl chain in this case.
        // FIXME Merge the functions into one decl.
      }
    }
  }
}

DeclarationNameInfo NameInfo(Name, Loc);
// Import additional name location/type info.
if (Error Err = ImportDeclarationNameLoc(D->getNameInfo(), NameInfo))
  return std::move(Err);

QualType FromTy = D->getType();
// Set to true if we do not import the type of the function as is. There are
// cases when the original type would result in an infinite recursion during
// the import. To avoid an infinite recursion when importing, we create the
// FunctionDecl with a simplified function type and update it only after the
// relevant AST nodes are already imported.
bool UsedDifferentProtoType = false;
if (const auto *FromFPT = FromTy->getAs<FunctionProtoType>()) {
  QualType FromReturnTy = FromFPT->getReturnType();
  // Functions with auto return type may define a struct inside their body
  // and the return type could refer to that struct.
  // E.g.: auto foo() { struct X{}; return X(); }
  // To avoid an infinite recursion when importing, create the FunctionDecl
  // with a simplified return type.
  if (hasAutoReturnTypeDeclaredInside(D)) {
    FromReturnTy = Importer.getFromContext().VoidTy;
    UsedDifferentProtoType = true;
  }
  FunctionProtoType::ExtProtoInfo FromEPI = FromFPT->getExtProtoInfo();
  // FunctionProtoType::ExtProtoInfo's ExceptionSpecDecl can point to the
  // FunctionDecl that we are importing the FunctionProtoType for.
  // To avoid an infinite recursion when importing, create the FunctionDecl
  // with a simplified function type.
  if (FromEPI.ExceptionSpec.SourceDecl ||
      FromEPI.ExceptionSpec.SourceTemplate ||
      FromEPI.ExceptionSpec.NoexceptExpr) {
    FunctionProtoType::ExtProtoInfo DefaultEPI;
    FromEPI = DefaultEPI;
    UsedDifferentProtoType = true;
  }
  FromTy = Importer.getFromContext().getFunctionType(
      FromReturnTy, FromFPT->getParamTypes(), FromEPI);
}

Error Err = Error::success();
auto T = importChecked(Err, FromTy);
auto TInfo = importChecked(Err, D->getTypeSourceInfo());
auto ToInnerLocStart = importChecked(Err, D->getInnerLocStart());
auto ToEndLoc = importChecked(Err, D->getEndLoc());
auto ToQualifierLoc = importChecked(Err, D->getQualifierLoc());
auto TrailingRequiresClause =
    importChecked(Err, D->getTrailingRequiresClause());
if (Err)
  return std::move(Err);

// Import the function parameters.
SmallVector<ParmVarDecl *, 8> Parameters;
for (auto P : D->parameters()) {
  if (Expected<ParmVarDecl *> ToPOrErr = import(P))
    Parameters.push_back(*ToPOrErr);
  else
    return ToPOrErr.takeError();
}

// Create the imported function.
FunctionDecl *ToFunction = nullptr;
if (auto *FromConstructor = dyn_cast<CXXConstructorDecl>(D)) {
  ExplicitSpecifier ESpec =
      importExplicitSpecifier(Err, FromConstructor->getExplicitSpecifier());
  if (Err)
    return std::move(Err);
  if (GetImportedOrCreateDecl<CXXConstructorDecl>(
          ToFunction, D, Importer.getToContext(), cast<CXXRecordDecl>(DC),
          ToInnerLocStart, NameInfo, T, TInfo, ESpec, D->isInlineSpecified(),
          D->isImplicit(), D->getConstexprKind(),
          InheritedConstructor(), // FIXME: Properly import inherited
                                  // constructor info
          TrailingRequiresClause))
    return ToFunction;
} else if (CXXDestructorDecl *FromDtor = dyn_cast<CXXDestructorDecl>(D)) {

  Error Err = Error::success();
  auto ToOperatorDelete = importChecked(
      Err, const_cast<FunctionDecl *>(FromDtor->getOperatorDelete()));
  auto ToThisArg = importChecked(Err, FromDtor->getOperatorDeleteThisArg());
  if (Err)
    return std::move(Err);

  if (GetImportedOrCreateDecl<CXXDestructorDecl>(
      ToFunction, D, Importer.getToContext(), cast<CXXRecordDecl>(DC),
      ToInnerLocStart, NameInfo, T, TInfo, D->isInlineSpecified(),
      D->isImplicit(), D->getConstexprKind(), TrailingRequiresClause))
    return ToFunction;

  CXXDestructorDecl *ToDtor = cast<CXXDestructorDecl>(ToFunction);

  ToDtor->setOperatorDelete(ToOperatorDelete, ToThisArg);
} else if (CXXConversionDecl *FromConversion =
               dyn_cast<CXXConversionDecl>(D)) {
  ExplicitSpecifier ESpec =
      importExplicitSpecifier(Err, FromConversion->getExplicitSpecifier());
  if (Err)
    return std::move(Err);
  if (GetImportedOrCreateDecl<CXXConversionDecl>(
          ToFunction, D, Importer.getToContext(), cast<CXXRecordDecl>(DC),
          ToInnerLocStart, NameInfo, T, TInfo, D->isInlineSpecified(), ESpec,
          D->getConstexprKind(), SourceLocation(), TrailingRequiresClause))
    return ToFunction;
} else if (auto *Method = dyn_cast<CXXMethodDecl>(D)) {
  if (GetImportedOrCreateDecl<CXXMethodDecl>(
          ToFunction, D, Importer.getToContext(), cast<CXXRecordDecl>(DC),
          ToInnerLocStart, NameInfo, T, TInfo, Method->getStorageClass(),
          Method->isInlineSpecified(), D->getConstexprKind(),
          SourceLocation(), TrailingRequiresClause))
    return ToFunction;
} else if (auto *Guide = dyn_cast<CXXDeductionGuideDecl>(D)) {
  ExplicitSpecifier ESpec =
      importExplicitSpecifier(Err, Guide->getExplicitSpecifier());
  CXXConstructorDecl *Ctor =
      importChecked(Err, Guide->getCorrespondingConstructor());
  if (Err)
    return std::move(Err);
  if (GetImportedOrCreateDecl<CXXDeductionGuideDecl>(
          ToFunction, D, Importer.getToContext(), DC, ToInnerLocStart, ESpec,
          NameInfo, T, TInfo, ToEndLoc, Ctor))
    return ToFunction;
  cast<CXXDeductionGuideDecl>(ToFunction)
      ->setIsCopyDeductionCandidate(Guide->isCopyDeductionCandidate());
} else {
  if (GetImportedOrCreateDecl(
          ToFunction, D, Importer.getToContext(), DC, ToInnerLocStart,
          NameInfo, T, TInfo, D->getStorageClass(), D->isInlineSpecified(),
          D->hasWrittenPrototype(), D->getConstexprKind(),
          TrailingRequiresClause))
    return ToFunction;
}

// Connect the redecl chain.
if (FoundByLookup) {
  auto *Recent = const_cast<FunctionDecl *>(
        FoundByLookup->getMostRecentDecl());
  ToFunction->setPreviousDecl(Recent);
  // FIXME Probably we should merge exception specifications.  E.g. In the
  // "To" context the existing function may have exception specification with
  // noexcept-unevaluated, while the newly imported function may have an
  // evaluated noexcept.  A call to adjustExceptionSpec() on the imported
  // decl and its redeclarations may be required.
}

ToFunction->setQualifierInfo(ToQualifierLoc);
ToFunction->setAccess(D->getAccess());
ToFunction->setLexicalDeclContext(LexicalDC);
ToFunction->setVirtualAsWritten(D->isVirtualAsWritten());
ToFunction->setTrivial(D->isTrivial());
ToFunction->setPure(D->isPure());
ToFunction->setDefaulted(D->isDefaulted());
ToFunction->setExplicitlyDefaulted(D->isExplicitlyDefaulted());
ToFunction->setDeletedAsWritten(D->isDeletedAsWritten());
ToFunction->setRangeEnd(ToEndLoc);

// Set the parameters.
for (auto *Param : Parameters) {
  Param->setOwningFunction(ToFunction);
  ToFunction->addDeclInternal(Param);
  if (ASTImporterLookupTable *LT = Importer.SharedState->getLookupTable())
    LT->update(Param, Importer.getToContext().getTranslationUnitDecl());
}
ToFunction->setParams(Parameters);

// We need to complete creation of FunctionProtoTypeLoc manually with setting
// params it refers to.
if (TInfo) {
  if (auto ProtoLoc =
      TInfo->getTypeLoc().IgnoreParens().getAs<FunctionProtoTypeLoc>()) {
    for (unsigned I = 0, N = Parameters.size(); I != N; ++I)
      ProtoLoc.setParam(I, Parameters[I]);
  }
}

// Import the describing template function, if any.
if (FromFT) {
  auto ToFTOrErr = import(FromFT);
  if (!ToFTOrErr)
    return ToFTOrErr.takeError();
}

// Import Ctor initializers.
if (auto *FromConstructor = dyn_cast<CXXConstructorDecl>(D)) {
  if (unsigned NumInitializers = FromConstructor->getNumCtorInitializers()) {
    SmallVector<CXXCtorInitializer *, 4> CtorInitializers(NumInitializers);
    // Import first, then allocate memory and copy if there was no error.
    if (Error Err = ImportContainerChecked(
        FromConstructor->inits(), CtorInitializers))
      return std::move(Err);
    auto **Memory =
        new (Importer.getToContext()) CXXCtorInitializer *[NumInitializers];
    std::copy(CtorInitializers.begin(), CtorInitializers.end(), Memory);
    auto *ToCtor = cast<CXXConstructorDecl>(ToFunction);
    ToCtor->setCtorInitializers(Memory);
    ToCtor->setNumCtorInitializers(NumInitializers);
  }
}

if (D->doesThisDeclarationHaveABody()) {
  Error Err = ImportFunctionDeclBody(D, ToFunction);

  if (Err)
    return std::move(Err);
}

// Import and set the original type in case we used another type.
if (UsedDifferentProtoType) {
  if (ExpectedType TyOrErr = import(D->getType()))
    ToFunction->setType(*TyOrErr);
  else
    return TyOrErr.takeError();
}

// FIXME: Other bits to merge?

// If it is a template, import all related things.
if (Error Err = ImportTemplateInformation(D, ToFunction))
  return std::move(Err);

addDeclToContexts(D, ToFunction);

if (auto *FromCXXMethod = dyn_cast<CXXMethodDecl>(D))
  if (Error Err = ImportOverriddenMethods(cast<CXXMethodDecl>(ToFunction),
                                          FromCXXMethod))
    return std::move(Err);

// Import the rest of the chain. I.e. import all subsequent declarations.
for (++RedeclIt; RedeclIt != Redecls.end(); ++RedeclIt) {
  ExpectedDecl ToRedeclOrErr = import(*RedeclIt);
  if (!ToRedeclOrErr)
    return ToRedeclOrErr.takeError();
}

return ToFunction;
3630}

3632ExpectedDecl ASTNodeImporter::VisitCXXMethodDecl(CXXMethodDecl *D) {
return VisitFunctionDecl(D);
3634}

3636ExpectedDecl ASTNodeImporter::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
return VisitCXXMethodDecl(D);
3638}

3640ExpectedDecl ASTNodeImporter::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
return VisitCXXMethodDecl(D);
3642}

3644ExpectedDecl ASTNodeImporter::VisitCXXConversionDecl(CXXConversionDecl *D) {
return VisitCXXMethodDecl(D);
3646}

3648ExpectedDecl
3649ASTNodeImporter::VisitCXXDeductionGuideDecl(CXXDeductionGuideDecl *D) {
return VisitFunctionDecl(D);
3651}

3653ExpectedDecl ASTNodeImporter::VisitFieldDecl(FieldDecl *D) {
// Import the major distinguishing characteristics of a variable.
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

// Determine whether we've already imported this field.
auto FoundDecls = Importer.findDeclsInToCtx(DC, Name);
for (auto *FoundDecl : FoundDecls) {
  if (FieldDecl *FoundField = dyn_cast<FieldDecl>(FoundDecl)) {
    // For anonymous fields, match up by index.
    if (!Name &&
        ASTImporter::getFieldIndex(D) !=
        ASTImporter::getFieldIndex(FoundField))
      continue;

    if (Importer.IsStructurallyEquivalent(D->getType(),
                                          FoundField->getType())) {
      Importer.MapImported(D, FoundField);
      // In case of a FieldDecl of a ClassTemplateSpecializationDecl, the
      // initializer of a FieldDecl might not had been instantiated in the
      // "To" context.  However, the "From" context might instantiated that,
      // thus we have to merge that.
      if (Expr *FromInitializer = D->getInClassInitializer()) {
        // We don't have yet the initializer set.
        if (FoundField->hasInClassInitializer() &&
            !FoundField->getInClassInitializer()) {
          if (ExpectedExpr ToInitializerOrErr = import(FromInitializer))
            FoundField->setInClassInitializer(*ToInitializerOrErr);
          else {
            // We can't return error here,
            // since we already mapped D as imported.
            // FIXME: warning message?
            consumeError(ToInitializerOrErr.takeError());
            return FoundField;
          }
        }
      }
      return FoundField;
    }

    // FIXME: Why is this case not handled with calling HandleNameConflict?
    Importer.ToDiag(Loc, diag::warn_odr_field_type_inconsistent)
      << Name << D->getType() << FoundField->getType();
    Importer.ToDiag(FoundField->getLocation(), diag::note_odr_value_here)
      << FoundField->getType();

    return make_error<ImportError>(ImportError::NameConflict);
  }
}

Error Err = Error::success();
auto ToType = importChecked(Err, D->getType());
auto ToTInfo = importChecked(Err, D->getTypeSourceInfo());
auto ToBitWidth = importChecked(Err, D->getBitWidth());
auto ToInnerLocStart = importChecked(Err, D->getInnerLocStart());
auto ToInitializer = importChecked(Err, D->getInClassInitializer());
if (Err)
  return std::move(Err);
const Type *ToCapturedVLAType = nullptr;
if (Error Err = Importer.importInto(
        ToCapturedVLAType, cast_or_null<Type>(D->getCapturedVLAType())))
  return std::move(Err);

FieldDecl *ToField;
if (GetImportedOrCreateDecl(ToField, D, Importer.getToContext(), DC,
                            ToInnerLocStart, Loc, Name.getAsIdentifierInfo(),
                            ToType, ToTInfo, ToBitWidth, D->isMutable(),
                            D->getInClassInitStyle()))
  return ToField;

ToField->setAccess(D->getAccess());
ToField->setLexicalDeclContext(LexicalDC);
if (ToInitializer)
  ToField->setInClassInitializer(ToInitializer);
ToField->setImplicit(D->isImplicit());
if (ToCapturedVLAType)
  ToField->setCapturedVLAType(cast<VariableArrayType>(ToCapturedVLAType));
LexicalDC->addDeclInternal(ToField);
return ToField;
3738}

3740ExpectedDecl ASTNodeImporter::VisitIndirectFieldDecl(IndirectFieldDecl *D) {
// Import the major distinguishing characteristics of a variable.
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

// Determine whether we've already imported this field.
auto FoundDecls = Importer.findDeclsInToCtx(DC, Name);
for (unsigned I = 0, N = FoundDecls.size(); I != N; ++I) {
  if (auto *FoundField = dyn_cast<IndirectFieldDecl>(FoundDecls[I])) {
    // For anonymous indirect fields, match up by index.
    if (!Name &&
        ASTImporter::getFieldIndex(D) !=
        ASTImporter::getFieldIndex(FoundField))
      continue;

    if (Importer.IsStructurallyEquivalent(D->getType(),
                                          FoundField->getType(),
                                          !Name.isEmpty())) {
      Importer.MapImported(D, FoundField);
      return FoundField;
    }

    // If there are more anonymous fields to check, continue.
    if (!Name && I < N-1)
      continue;

    // FIXME: Why is this case not handled with calling HandleNameConflict?
    Importer.ToDiag(Loc, diag::warn_odr_field_type_inconsistent)
      << Name << D->getType() << FoundField->getType();
    Importer.ToDiag(FoundField->getLocation(), diag::note_odr_value_here)
      << FoundField->getType();

    return make_error<ImportError>(ImportError::NameConflict);
  }
}

// Import the type.
auto TypeOrErr = import(D->getType());
if (!TypeOrErr)
  return TypeOrErr.takeError();

auto **NamedChain =
  new (Importer.getToContext()) NamedDecl*[D->getChainingSize()];

unsigned i = 0;
for (auto *PI : D->chain())
  if (Expected<NamedDecl *> ToD = import(PI))
    NamedChain[i++] = *ToD;
  else
    return ToD.takeError();

llvm::MutableArrayRef<NamedDecl *> CH = {NamedChain, D->getChainingSize()};
IndirectFieldDecl *ToIndirectField;
if (GetImportedOrCreateDecl(ToIndirectField, D, Importer.getToContext(), DC,
                            Loc, Name.getAsIdentifierInfo(), *TypeOrErr, CH))
  // FIXME here we leak `NamedChain` which is allocated before
  return ToIndirectField;

ToIndirectField->setAccess(D->getAccess());
ToIndirectField->setLexicalDeclContext(LexicalDC);
LexicalDC->addDeclInternal(ToIndirectField);
return ToIndirectField;
3808}

3810/// Used as return type of getFriendCountAndPosition.
3811struct FriendCountAndPosition {
/// Number of similar looking friends.
unsigned int TotalCount;
/// Index of the specific FriendDecl.
unsigned int IndexOfDecl;
3816};

3818template <class T>
3819static FriendCountAndPosition getFriendCountAndPosition(
  const FriendDecl *FD,
  llvm::function_ref<T(const FriendDecl *)> GetCanTypeOrDecl) {
unsigned int FriendCount = 0;
llvm::Optional<unsigned int> FriendPosition;
const auto *RD = cast<CXXRecordDecl>(FD->getLexicalDeclContext());

T TypeOrDecl = GetCanTypeOrDecl(FD);

for (const FriendDecl *FoundFriend : RD->friends()) {
  if (FoundFriend == FD) {
    FriendPosition = FriendCount;
    ++FriendCount;
  } else if (!FoundFriend->getFriendDecl() == !FD->getFriendDecl() &&
             GetCanTypeOrDecl(FoundFriend) == TypeOrDecl) {
    ++FriendCount;
  }
}

assert(FriendPosition && "Friend decl not found in own parent.")((void)0);

return {FriendCount, *FriendPosition};
3841}

3843static FriendCountAndPosition getFriendCountAndPosition(const FriendDecl *FD) {
if (FD->getFriendType())
  return getFriendCountAndPosition<QualType>(FD, [](const FriendDecl *F) {
    if (TypeSourceInfo *TSI = F->getFriendType())
      return TSI->getType().getCanonicalType();
    llvm_unreachable("Wrong friend object type.")__builtin_unreachable();
  });
else
  return getFriendCountAndPosition<Decl *>(FD, [](const FriendDecl *F) {
    if (Decl *D = F->getFriendDecl())
      return D->getCanonicalDecl();
    llvm_unreachable("Wrong friend object type.")__builtin_unreachable();
  });
3856}

3858ExpectedDecl ASTNodeImporter::VisitFriendDecl(FriendDecl *D) {
// Import the major distinguishing characteristics of a declaration.
DeclContext *DC, *LexicalDC;
if (Error Err = ImportDeclContext(D, DC, LexicalDC))
  return std::move(Err);

// Determine whether we've already imported this decl.
// FriendDecl is not a NamedDecl so we cannot use lookup.
// We try to maintain order and count of redundant friend declarations.
const auto *RD = cast<CXXRecordDecl>(DC);
FriendDecl *ImportedFriend = RD->getFirstFriend();
SmallVector<FriendDecl *, 2> ImportedEquivalentFriends;

while (ImportedFriend) {
  bool Match = false;
  if (D->getFriendDecl() && ImportedFriend->getFriendDecl()) {
    Match =
        IsStructuralMatch(D->getFriendDecl(), ImportedFriend->getFriendDecl(),
                          /*Complain=*/false);
  } else if (D->getFriendType() && ImportedFriend->getFriendType()) {
    Match = Importer.IsStructurallyEquivalent(
        D->getFriendType()->getType(),
        ImportedFriend->getFriendType()->getType(), /*Complain=*/false);
  }
  if (Match)
    ImportedEquivalentFriends.push_back(ImportedFriend);

  ImportedFriend = ImportedFriend->getNextFriend();
}
FriendCountAndPosition CountAndPosition = getFriendCountAndPosition(D);

assert(ImportedEquivalentFriends.size() <= CountAndPosition.TotalCount &&((void)0)
       "Class with non-matching friends is imported, ODR check wrong?")((void)0);
if (ImportedEquivalentFriends.size() == CountAndPosition.TotalCount)
  return Importer.MapImported(
      D, ImportedEquivalentFriends[CountAndPosition.IndexOfDecl]);

// Not found. Create it.
// The declarations will be put into order later by ImportDeclContext.
FriendDecl::FriendUnion ToFU;
if (NamedDecl *FriendD = D->getFriendDecl()) {
  NamedDecl *ToFriendD;
  if (Error Err = importInto(ToFriendD, FriendD))
    return std::move(Err);

  if (FriendD->getFriendObjectKind() != Decl::FOK_None &&
      !(FriendD->isInIdentifierNamespace(Decl::IDNS_NonMemberOperator)))
    ToFriendD->setObjectOfFriendDecl(false);

  ToFU = ToFriendD;
} else { // The friend is a type, not a decl.
  if (auto TSIOrErr = import(D->getFriendType()))
    ToFU = *TSIOrErr;
  else
    return TSIOrErr.takeError();
}

SmallVector<TemplateParameterList *, 1> ToTPLists(D->NumTPLists);
auto **FromTPLists = D->getTrailingObjects<TemplateParameterList *>();
for (unsigned I = 0; I < D->NumTPLists; I++) {
  if (auto ListOrErr = import(FromTPLists[I]))
    ToTPLists[I] = *ListOrErr;
  else
    return ListOrErr.takeError();
}

auto LocationOrErr = import(D->getLocation());
if (!LocationOrErr)
  return LocationOrErr.takeError();
auto FriendLocOrErr = import(D->getFriendLoc());
if (!FriendLocOrErr)
  return FriendLocOrErr.takeError();

FriendDecl *FrD;
if (GetImportedOrCreateDecl(FrD, D, Importer.getToContext(), DC,
                            *LocationOrErr, ToFU,
                            *FriendLocOrErr, ToTPLists))
  return FrD;

FrD->setAccess(D->getAccess());
FrD->setLexicalDeclContext(LexicalDC);
LexicalDC->addDeclInternal(FrD);
return FrD;
3941}

3943ExpectedDecl ASTNodeImporter::VisitObjCIvarDecl(ObjCIvarDecl *D) {
// Import the major distinguishing characteristics of an ivar.
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

// Determine whether we've already imported this ivar
auto FoundDecls = Importer.findDeclsInToCtx(DC, Name);
for (auto *FoundDecl : FoundDecls) {
  if (ObjCIvarDecl *FoundIvar = dyn_cast<ObjCIvarDecl>(FoundDecl)) {
    if (Importer.IsStructurallyEquivalent(D->getType(),
                                          FoundIvar->getType())) {
      Importer.MapImported(D, FoundIvar);
      return FoundIvar;
    }

    Importer.ToDiag(Loc, diag::warn_odr_ivar_type_inconsistent)
      << Name << D->getType() << FoundIvar->getType();
    Importer.ToDiag(FoundIvar->getLocation(), diag::note_odr_value_here)
      << FoundIvar->getType();

    return make_error<ImportError>(ImportError::NameConflict);
  }
}

Error Err = Error::success();
auto ToType = importChecked(Err, D->getType());
auto ToTypeSourceInfo = importChecked(Err, D->getTypeSourceInfo());
auto ToBitWidth = importChecked(Err, D->getBitWidth());
auto ToInnerLocStart = importChecked(Err, D->getInnerLocStart());
if (Err)
  return std::move(Err);

ObjCIvarDecl *ToIvar;
if (GetImportedOrCreateDecl(
        ToIvar, D, Importer.getToContext(), cast<ObjCContainerDecl>(DC),
        ToInnerLocStart, Loc, Name.getAsIdentifierInfo(),
        ToType, ToTypeSourceInfo,
        D->getAccessControl(),ToBitWidth, D->getSynthesize()))
  return ToIvar;

ToIvar->setLexicalDeclContext(LexicalDC);
LexicalDC->addDeclInternal(ToIvar);
return ToIvar;
3992}

3994ExpectedDecl ASTNodeImporter::VisitVarDecl(VarDecl *D) {

SmallVector<Decl*, 2> Redecls = getCanonicalForwardRedeclChain(D);
auto RedeclIt = Redecls.begin();
// Import the first part of the decl chain. I.e. import all previous
// declarations starting from the canonical decl.
for (; RedeclIt != Redecls.end() && *RedeclIt != D; ++RedeclIt) {
  ExpectedDecl RedeclOrErr = import(*RedeclIt);
  if (!RedeclOrErr)
    return RedeclOrErr.takeError();
}
assert(*RedeclIt == D)((void)0);

// Import the major distinguishing characteristics of a variable.
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

// Try to find a variable in our own ("to") context with the same name and
// in the same context as the variable we're importing.
VarDecl *FoundByLookup = nullptr;
if (D->isFileVarDecl()) {
  SmallVector<NamedDecl *, 4> ConflictingDecls;
  unsigned IDNS = Decl::IDNS_Ordinary;
  auto FoundDecls = Importer.findDeclsInToCtx(DC, Name);
  for (auto *FoundDecl : FoundDecls) {
    if (!FoundDecl->isInIdentifierNamespace(IDNS))
      continue;

    if (auto *FoundVar = dyn_cast<VarDecl>(FoundDecl)) {
      if (!hasSameVisibilityContextAndLinkage(FoundVar, D))
        continue;
      if (Importer.IsStructurallyEquivalent(D->getType(),
                                            FoundVar->getType())) {

        // The VarDecl in the "From" context has a definition, but in the
        // "To" context we already have a definition.
        VarDecl *FoundDef = FoundVar->getDefinition();
        if (D->isThisDeclarationADefinition() && FoundDef)
          // FIXME Check for ODR error if the two definitions have
          // different initializers?
          return Importer.MapImported(D, FoundDef);

        // The VarDecl in the "From" context has an initializer, but in the
        // "To" context we already have an initializer.
        const VarDecl *FoundDInit = nullptr;
        if (D->getInit() && FoundVar->getAnyInitializer(FoundDInit))
          // FIXME Diagnose ODR error if the two initializers are different?
          return Importer.MapImported(D, const_cast<VarDecl*>(FoundDInit));

        FoundByLookup = FoundVar;
        break;
      }

      const ArrayType *FoundArray
        = Importer.getToContext().getAsArrayType(FoundVar->getType());
      const ArrayType *TArray
        = Importer.getToContext().getAsArrayType(D->getType());
      if (FoundArray && TArray) {
        if (isa<IncompleteArrayType>(FoundArray) &&
            isa<ConstantArrayType>(TArray)) {
          // Import the type.
          if (auto TyOrErr = import(D->getType()))
            FoundVar->setType(*TyOrErr);
          else
            return TyOrErr.takeError();

          FoundByLookup = FoundVar;
          break;
        } else if (isa<IncompleteArrayType>(TArray) &&
                   isa<ConstantArrayType>(FoundArray)) {
          FoundByLookup = FoundVar;
          break;
        }
      }

      Importer.ToDiag(Loc, diag::warn_odr_variable_type_inconsistent)
        << Name << D->getType() << FoundVar->getType();
      Importer.ToDiag(FoundVar->getLocation(), diag::note_odr_value_here)
        << FoundVar->getType();
      ConflictingDecls.push_back(FoundDecl);
    }
  }

  if (!ConflictingDecls.empty()) {
    ExpectedName NameOrErr = Importer.HandleNameConflict(
        Name, DC, IDNS, ConflictingDecls.data(), ConflictingDecls.size());
    if (NameOrErr)
      Name = NameOrErr.get();
    else
      return NameOrErr.takeError();
  }
}

Error Err = Error::success();
auto ToType = importChecked(Err, D->getType());
auto ToTypeSourceInfo = importChecked(Err, D->getTypeSourceInfo());
auto ToInnerLocStart = importChecked(Err, D->getInnerLocStart());
auto ToQualifierLoc = importChecked(Err, D->getQualifierLoc());
if (Err)
  return std::move(Err);

VarDecl *ToVar;
if (auto *FromDecomp = dyn_cast<DecompositionDecl>(D)) {
  SmallVector<BindingDecl *> Bindings(FromDecomp->bindings().size());
  if (Error Err =
          ImportArrayChecked(FromDecomp->bindings(), Bindings.begin()))
    return std::move(Err);
  DecompositionDecl *ToDecomp;
  if (GetImportedOrCreateDecl(
          ToDecomp, FromDecomp, Importer.getToContext(), DC, ToInnerLocStart,
          Loc, ToType, ToTypeSourceInfo, D->getStorageClass(), Bindings))
    return ToDecomp;
  ToVar = ToDecomp;
} else {
  // Create the imported variable.
  if (GetImportedOrCreateDecl(ToVar, D, Importer.getToContext(), DC,
                              ToInnerLocStart, Loc,
                              Name.getAsIdentifierInfo(), ToType,
                              ToTypeSourceInfo, D->getStorageClass()))
    return ToVar;
}

ToVar->setTSCSpec(D->getTSCSpec());
ToVar->setQualifierInfo(ToQualifierLoc);
ToVar->setAccess(D->getAccess());
ToVar->setLexicalDeclContext(LexicalDC);

if (FoundByLookup) {
  auto *Recent = const_cast<VarDecl *>(FoundByLookup->getMostRecentDecl());
  ToVar->setPreviousDecl(Recent);
}

// Import the described template, if any.
if (D->getDescribedVarTemplate()) {
  auto ToVTOrErr = import(D->getDescribedVarTemplate());
  if (!ToVTOrErr)
    return ToVTOrErr.takeError();
}

if (Error Err = ImportInitializer(D, ToVar))
  return std::move(Err);

if (D->isConstexpr())
  ToVar->setConstexpr(true);

addDeclToContexts(D, ToVar);

// Import the rest of the chain. I.e. import all subsequent declarations.
for (++RedeclIt; RedeclIt != Redecls.end(); ++RedeclIt) {
  ExpectedDecl RedeclOrErr = import(*RedeclIt);
  if (!RedeclOrErr)
    return RedeclOrErr.takeError();
}

return ToVar;
4155}

4157ExpectedDecl ASTNodeImporter::VisitImplicitParamDecl(ImplicitParamDecl *D) {
// Parameters are created in the translation unit's context, then moved
// into the function declaration's context afterward.
DeclContext *DC = Importer.getToContext().getTranslationUnitDecl();

Error Err = Error::success();
auto ToDeclName = importChecked(Err, D->getDeclName());
auto ToLocation = importChecked(Err, D->getLocation());
auto ToType = importChecked(Err, D->getType());
if (Err)
  return std::move(Err);

// Create the imported parameter.
ImplicitParamDecl *ToParm = nullptr;
if (GetImportedOrCreateDecl(ToParm, D, Importer.getToContext(), DC,
                            ToLocation, ToDeclName.getAsIdentifierInfo(),
                            ToType, D->getParameterKind()))
  return ToParm;
return ToParm;
4176}

4178Error ASTNodeImporter::ImportDefaultArgOfParmVarDecl(
  const ParmVarDecl *FromParam, ParmVarDecl *ToParam) {
ToParam->setHasInheritedDefaultArg(FromParam->hasInheritedDefaultArg());
ToParam->setKNRPromoted(FromParam->isKNRPromoted());

if (FromParam->hasUninstantiatedDefaultArg()) {
  if (auto ToDefArgOrErr = import(FromParam->getUninstantiatedDefaultArg()))
    ToParam->setUninstantiatedDefaultArg(*ToDefArgOrErr);
  else
    return ToDefArgOrErr.takeError();
} else if (FromParam->hasUnparsedDefaultArg()) {
  ToParam->setUnparsedDefaultArg();
} else if (FromParam->hasDefaultArg()) {
  if (auto ToDefArgOrErr = import(FromParam->getDefaultArg()))
    ToParam->setDefaultArg(*ToDefArgOrErr);
  else
    return ToDefArgOrErr.takeError();
}

return Error::success();
4198}

4200ExpectedDecl ASTNodeImporter::VisitParmVarDecl(ParmVarDecl *D) {
// Parameters are created in the translation unit's context, then moved
// into the function declaration's context afterward.
DeclContext *DC = Importer.getToContext().getTranslationUnitDecl();

Error Err = Error::success();
auto ToDeclName = importChecked(Err, D->getDeclName());
auto ToLocation = importChecked(Err, D->getLocation());
auto ToInnerLocStart = importChecked(Err, D->getInnerLocStart());
auto ToType = importChecked(Err, D->getType());
auto ToTypeSourceInfo = importChecked(Err, D->getTypeSourceInfo());
if (Err)
  return std::move(Err);

ParmVarDecl *ToParm;
if (GetImportedOrCreateDecl(ToParm, D, Importer.getToContext(), DC,
                            ToInnerLocStart, ToLocation,
                            ToDeclName.getAsIdentifierInfo(), ToType,
                            ToTypeSourceInfo, D->getStorageClass(),
                            /*DefaultArg*/ nullptr))
  return ToParm;

// Set the default argument. It should be no problem if it was already done.
// Do not import the default expression before GetImportedOrCreateDecl call
// to avoid possible infinite import loop because circular dependency.
if (Error Err = ImportDefaultArgOfParmVarDecl(D, ToParm))
  return std::move(Err);

if (D->isObjCMethodParameter()) {
  ToParm->setObjCMethodScopeInfo(D->getFunctionScopeIndex());
  ToParm->setObjCDeclQualifier(D->getObjCDeclQualifier());
} else {
  ToParm->setScopeInfo(D->getFunctionScopeDepth(),
                       D->getFunctionScopeIndex());
}

return ToParm;
4237}

4239ExpectedDecl ASTNodeImporter::VisitObjCMethodDecl(ObjCMethodDecl *D) {
// Import the major distinguishing characteristics of a method.
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

auto FoundDecls = Importer.findDeclsInToCtx(DC, Name);
for (auto *FoundDecl : FoundDecls) {
  if (auto *FoundMethod = dyn_cast<ObjCMethodDecl>(FoundDecl)) {
    if (FoundMethod->isInstanceMethod() != D->isInstanceMethod())
      continue;

    // Check return types.
    if (!Importer.IsStructurallyEquivalent(D->getReturnType(),
                                           FoundMethod->getReturnType())) {
      Importer.ToDiag(Loc, diag::warn_odr_objc_method_result_type_inconsistent)
          << D->isInstanceMethod() << Name << D->getReturnType()
          << FoundMethod->getReturnType();
      Importer.ToDiag(FoundMethod->getLocation(),
                      diag::note_odr_objc_method_here)
        << D->isInstanceMethod() << Name;

      return make_error<ImportError>(ImportError::NameConflict);
    }

    // Check the number of parameters.
    if (D->param_size() != FoundMethod->param_size()) {
      Importer.ToDiag(Loc, diag::warn_odr_objc_method_num_params_inconsistent)
        << D->isInstanceMethod() << Name
        << D->param_size() << FoundMethod->param_size();
      Importer.ToDiag(FoundMethod->getLocation(),
                      diag::note_odr_objc_method_here)
        << D->isInstanceMethod() << Name;

      return make_error<ImportError>(ImportError::NameConflict);
    }

    // Check parameter types.
    for (ObjCMethodDecl::param_iterator P = D->param_begin(),
           PEnd = D->param_end(), FoundP = FoundMethod->param_begin();
         P != PEnd; ++P, ++FoundP) {
      if (!Importer.IsStructurallyEquivalent((*P)->getType(),
                                             (*FoundP)->getType())) {
        Importer.FromDiag((*P)->getLocation(),
                          diag::warn_odr_objc_method_param_type_inconsistent)
          << D->isInstanceMethod() << Name
          << (*P)->getType() << (*FoundP)->getType();
        Importer.ToDiag((*FoundP)->getLocation(), diag::note_odr_value_here)
          << (*FoundP)->getType();

        return make_error<ImportError>(ImportError::NameConflict);
      }
    }

    // Check variadic/non-variadic.
    // Check the number of parameters.
    if (D->isVariadic() != FoundMethod->isVariadic()) {
      Importer.ToDiag(Loc, diag::warn_odr_objc_method_variadic_inconsistent)
        << D->isInstanceMethod() << Name;
      Importer.ToDiag(FoundMethod->getLocation(),
                      diag::note_odr_objc_method_here)
        << D->isInstanceMethod() << Name;

      return make_error<ImportError>(ImportError::NameConflict);
    }

    // FIXME: Any other bits we need to merge?
    return Importer.MapImported(D, FoundMethod);
  }
}

Error Err = Error::success();
auto ToEndLoc = importChecked(Err, D->getEndLoc());
auto ToReturnType = importChecked(Err, D->getReturnType());
auto ToReturnTypeSourceInfo =
    importChecked(Err, D->getReturnTypeSourceInfo());
if (Err)
  return std::move(Err);

ObjCMethodDecl *ToMethod;
if (GetImportedOrCreateDecl(
        ToMethod, D, Importer.getToContext(), Loc, ToEndLoc,
        Name.getObjCSelector(), ToReturnType, ToReturnTypeSourceInfo, DC,
        D->isInstanceMethod(), D->isVariadic(), D->isPropertyAccessor(),
        D->isSynthesizedAccessorStub(), D->isImplicit(), D->isDefined(),
        D->getImplementationControl(), D->hasRelatedResultType()))
  return ToMethod;

// FIXME: When we decide to merge method definitions, we'll need to
// deal with implicit parameters.

// Import the parameters
SmallVector<ParmVarDecl *, 5> ToParams;
for (auto *FromP : D->parameters()) {
  if (Expected<ParmVarDecl *> ToPOrErr = import(FromP))
    ToParams.push_back(*ToPOrErr);
  else
    return ToPOrErr.takeError();
}

// Set the parameters.
for (auto *ToParam : ToParams) {
  ToParam->setOwningFunction(ToMethod);
  ToMethod->addDeclInternal(ToParam);
}

SmallVector<SourceLocation, 12> FromSelLocs;
D->getSelectorLocs(FromSelLocs);
SmallVector<SourceLocation, 12> ToSelLocs(FromSelLocs.size());
if (Error Err = ImportContainerChecked(FromSelLocs, ToSelLocs))
  return std::move(Err);

ToMethod->setMethodParams(Importer.getToContext(), ToParams, ToSelLocs);

ToMethod->setLexicalDeclContext(LexicalDC);
LexicalDC->addDeclInternal(ToMethod);

// Implicit params are declared when Sema encounters the definition but this
// never happens when the method is imported. Manually declare the implicit
// params now that the MethodDecl knows its class interface.
if (D->getSelfDecl())
  ToMethod->createImplicitParams(Importer.getToContext(),
                                 ToMethod->getClassInterface());

return ToMethod;
4369}

4371ExpectedDecl ASTNodeImporter::VisitObjCTypeParamDecl(ObjCTypeParamDecl *D) {
// Import the major distinguishing characteristics of a category.
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

Error Err = Error::success();
auto ToVarianceLoc = importChecked(Err, D->getVarianceLoc());
auto ToLocation = importChecked(Err, D->getLocation());
auto ToColonLoc = importChecked(Err, D->getColonLoc());
auto ToTypeSourceInfo = importChecked(Err, D->getTypeSourceInfo());
if (Err)
  return std::move(Err);

ObjCTypeParamDecl *Result;
if (GetImportedOrCreateDecl(
        Result, D, Importer.getToContext(), DC, D->getVariance(),
        ToVarianceLoc, D->getIndex(),
        ToLocation, Name.getAsIdentifierInfo(),
        ToColonLoc, ToTypeSourceInfo))
  return Result;

Result->setLexicalDeclContext(LexicalDC);
return Result;
4400}

4402ExpectedDecl ASTNodeImporter::VisitObjCCategoryDecl(ObjCCategoryDecl *D) {
// Import the major distinguishing characteristics of a category.
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
11
←
Calling 'Error::operator bool'→
14
←
Returning from 'Error::operator bool'→
15
←
Taking false branch→
  return std::move(Err);
if (ToD)
16
←
Assuming 'ToD' is null→
17
←
Taking false branch→
  return ToD;

ObjCInterfaceDecl *ToInterface;
18
←
'ToInterface' declared without an initial value→
if (Error Err = importInto(ToInterface, D->getClassInterface()))
19
←
Calling 'ASTNodeImporter::importInto'→
22
←
Returning from 'ASTNodeImporter::importInto'→
23
←
Calling 'Error::operator bool'→
26
←
Returning from 'Error::operator bool'→
27
←
Taking false branch→
  return std::move(Err);

// Determine if we've already encountered this category.
ObjCCategoryDecl *MergeWithCategory
  = ToInterface->FindCategoryDeclaration(Name.getAsIdentifierInfo());
28
←
Called C++ object pointer is uninitialized
ObjCCategoryDecl *ToCategory = MergeWithCategory;
if (!ToCategory) {

  Error Err = Error::success();
  auto ToAtStartLoc = importChecked(Err, D->getAtStartLoc());
  auto ToCategoryNameLoc = importChecked(Err, D->getCategoryNameLoc());
  auto ToIvarLBraceLoc = importChecked(Err, D->getIvarLBraceLoc());
  auto ToIvarRBraceLoc = importChecked(Err, D->getIvarRBraceLoc());
  if (Err)
    return std::move(Err);

  if (GetImportedOrCreateDecl(ToCategory, D, Importer.getToContext(), DC,
                              ToAtStartLoc, Loc,
                              ToCategoryNameLoc,
                              Name.getAsIdentifierInfo(), ToInterface,
                              /*TypeParamList=*/nullptr,
                              ToIvarLBraceLoc,
                              ToIvarRBraceLoc))
    return ToCategory;

  ToCategory->setLexicalDeclContext(LexicalDC);
  LexicalDC->addDeclInternal(ToCategory);
  // Import the type parameter list after MapImported, to avoid
  // loops when bringing in their DeclContext.
  if (auto PListOrErr = ImportObjCTypeParamList(D->getTypeParamList()))
    ToCategory->setTypeParamList(*PListOrErr);
  else
    return PListOrErr.takeError();

  // Import protocols
  SmallVector<ObjCProtocolDecl *, 4> Protocols;
  SmallVector<SourceLocation, 4> ProtocolLocs;
  ObjCCategoryDecl::protocol_loc_iterator FromProtoLoc
    = D->protocol_loc_begin();
  for (ObjCCategoryDecl::protocol_iterator FromProto = D->protocol_begin(),
                                        FromProtoEnd = D->protocol_end();
       FromProto != FromProtoEnd;
       ++FromProto, ++FromProtoLoc) {
    if (Expected<ObjCProtocolDecl *> ToProtoOrErr = import(*FromProto))
      Protocols.push_back(*ToProtoOrErr);
    else
      return ToProtoOrErr.takeError();

    if (ExpectedSLoc ToProtoLocOrErr = import(*FromProtoLoc))
      ProtocolLocs.push_back(*ToProtoLocOrErr);
    else
      return ToProtoLocOrErr.takeError();
  }

  // FIXME: If we're merging, make sure that the protocol list is the same.
  ToCategory->setProtocolList(Protocols.data(), Protocols.size(),
                              ProtocolLocs.data(), Importer.getToContext());

} else {
  Importer.MapImported(D, ToCategory);
}

// Import all of the members of this category.
if (Error Err = ImportDeclContext(D))
  return std::move(Err);

// If we have an implementation, import it as well.
if (D->getImplementation()) {
  if (Expected<ObjCCategoryImplDecl *> ToImplOrErr =
      import(D->getImplementation()))
    ToCategory->setImplementation(*ToImplOrErr);
  else
    return ToImplOrErr.takeError();
}

return ToCategory;
4491}

4493Error ASTNodeImporter::ImportDefinition(
  ObjCProtocolDecl *From, ObjCProtocolDecl *To, ImportDefinitionKind Kind) {
if (To->getDefinition()) {
  if (shouldForceImportDeclContext(Kind))
    if (Error Err = ImportDeclContext(From))
      return Err;
  return Error::success();
}

// Start the protocol definition
To->startDefinition();

// Import protocols
SmallVector<ObjCProtocolDecl *, 4> Protocols;
SmallVector<SourceLocation, 4> ProtocolLocs;
ObjCProtocolDecl::protocol_loc_iterator FromProtoLoc =
    From->protocol_loc_begin();
for (ObjCProtocolDecl::protocol_iterator FromProto = From->protocol_begin(),
                                      FromProtoEnd = From->protocol_end();
     FromProto != FromProtoEnd;
     ++FromProto, ++FromProtoLoc) {
  if (Expected<ObjCProtocolDecl *> ToProtoOrErr = import(*FromProto))
    Protocols.push_back(*ToProtoOrErr);
  else
    return ToProtoOrErr.takeError();

  if (ExpectedSLoc ToProtoLocOrErr = import(*FromProtoLoc))
    ProtocolLocs.push_back(*ToProtoLocOrErr);
  else
    return ToProtoLocOrErr.takeError();

}

// FIXME: If we're merging, make sure that the protocol list is the same.
To->setProtocolList(Protocols.data(), Protocols.size(),
                    ProtocolLocs.data(), Importer.getToContext());

if (shouldForceImportDeclContext(Kind)) {
  // Import all of the members of this protocol.
  if (Error Err = ImportDeclContext(From, /*ForceImport=*/true))
    return Err;
}
return Error::success();
4536}

4538ExpectedDecl ASTNodeImporter::VisitObjCProtocolDecl(ObjCProtocolDecl *D) {
// If this protocol has a definition in the translation unit we're coming
// from, but this particular declaration is not that definition, import the
// definition and map to that.
ObjCProtocolDecl *Definition = D->getDefinition();
if (Definition && Definition != D) {
  if (ExpectedDecl ImportedDefOrErr = import(Definition))
    return Importer.MapImported(D, *ImportedDefOrErr);
  else
    return ImportedDefOrErr.takeError();
}

// Import the major distinguishing characteristics of a protocol.
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

ObjCProtocolDecl *MergeWithProtocol = nullptr;
auto FoundDecls = Importer.findDeclsInToCtx(DC, Name);
for (auto *FoundDecl : FoundDecls) {
  if (!FoundDecl->isInIdentifierNamespace(Decl::IDNS_ObjCProtocol))
    continue;

  if ((MergeWithProtocol = dyn_cast<ObjCProtocolDecl>(FoundDecl)))
    break;
}

ObjCProtocolDecl *ToProto = MergeWithProtocol;
if (!ToProto) {
  auto ToAtBeginLocOrErr = import(D->getAtStartLoc());
  if (!ToAtBeginLocOrErr)
    return ToAtBeginLocOrErr.takeError();

  if (GetImportedOrCreateDecl(ToProto, D, Importer.getToContext(), DC,
                              Name.getAsIdentifierInfo(), Loc,
                              *ToAtBeginLocOrErr,
                              /*PrevDecl=*/nullptr))
    return ToProto;
  ToProto->setLexicalDeclContext(LexicalDC);
  LexicalDC->addDeclInternal(ToProto);
}

Importer.MapImported(D, ToProto);

if (D->isThisDeclarationADefinition())
  if (Error Err = ImportDefinition(D, ToProto))
    return std::move(Err);

return ToProto;
4592}

4594ExpectedDecl ASTNodeImporter::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
DeclContext *DC, *LexicalDC;
if (Error Err = ImportDeclContext(D, DC, LexicalDC))
  return std::move(Err);

ExpectedSLoc ExternLocOrErr = import(D->getExternLoc());
if (!ExternLocOrErr)
  return ExternLocOrErr.takeError();

ExpectedSLoc LangLocOrErr = import(D->getLocation());
if (!LangLocOrErr)
  return LangLocOrErr.takeError();

bool HasBraces = D->hasBraces();

LinkageSpecDecl *ToLinkageSpec;
if (GetImportedOrCreateDecl(ToLinkageSpec, D, Importer.getToContext(), DC,
                            *ExternLocOrErr, *LangLocOrErr,
                            D->getLanguage(), HasBraces))
  return ToLinkageSpec;

if (HasBraces) {
  ExpectedSLoc RBraceLocOrErr = import(D->getRBraceLoc());
  if (!RBraceLocOrErr)
    return RBraceLocOrErr.takeError();
  ToLinkageSpec->setRBraceLoc(*RBraceLocOrErr);
}

ToLinkageSpec->setLexicalDeclContext(LexicalDC);
LexicalDC->addDeclInternal(ToLinkageSpec);

return ToLinkageSpec;
4626}

4628ExpectedDecl ASTNodeImporter::ImportUsingShadowDecls(BaseUsingDecl *D,
                                                   BaseUsingDecl *ToSI) {
for (UsingShadowDecl *FromShadow : D->shadows()) {
  if (Expected<UsingShadowDecl *> ToShadowOrErr = import(FromShadow))
    ToSI->addShadowDecl(*ToShadowOrErr);
  else
    // FIXME: We return error here but the definition is already created
    // and available with lookups. How to fix this?..
    return ToShadowOrErr.takeError();
}
return ToSI;
4639}

4641ExpectedDecl ASTNodeImporter::VisitUsingDecl(UsingDecl *D) {
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD = nullptr;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

Error Err = Error::success();
auto ToLoc = importChecked(Err, D->getNameInfo().getLoc());
auto ToUsingLoc = importChecked(Err, D->getUsingLoc());
auto ToQualifierLoc = importChecked(Err, D->getQualifierLoc());
if (Err)
  return std::move(Err);

DeclarationNameInfo NameInfo(Name, ToLoc);
if (Error Err = ImportDeclarationNameLoc(D->getNameInfo(), NameInfo))
  return std::move(Err);

UsingDecl *ToUsing;
if (GetImportedOrCreateDecl(ToUsing, D, Importer.getToContext(), DC,
                            ToUsingLoc, ToQualifierLoc, NameInfo,
                            D->hasTypename()))
  return ToUsing;

ToUsing->setLexicalDeclContext(LexicalDC);
LexicalDC->addDeclInternal(ToUsing);

if (NamedDecl *FromPattern =
    Importer.getFromContext().getInstantiatedFromUsingDecl(D)) {
  if (Expected<NamedDecl *> ToPatternOrErr = import(FromPattern))
    Importer.getToContext().setInstantiatedFromUsingDecl(
        ToUsing, *ToPatternOrErr);
  else
    return ToPatternOrErr.takeError();
}

return ImportUsingShadowDecls(D, ToUsing);
4681}

4683ExpectedDecl ASTNodeImporter::VisitUsingEnumDecl(UsingEnumDecl *D) {
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD = nullptr;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

Error Err = Error::success();
auto ToUsingLoc = importChecked(Err, D->getUsingLoc());
auto ToEnumLoc = importChecked(Err, D->getEnumLoc());
auto ToEnumDecl = importChecked(Err, D->getEnumDecl());
if (Err)
  return std::move(Err);

UsingEnumDecl *ToUsingEnum;
if (GetImportedOrCreateDecl(ToUsingEnum, D, Importer.getToContext(), DC,
                            ToUsingLoc, ToEnumLoc, Loc, ToEnumDecl))
  return ToUsingEnum;

ToUsingEnum->setLexicalDeclContext(LexicalDC);
LexicalDC->addDeclInternal(ToUsingEnum);

if (UsingEnumDecl *FromPattern =
        Importer.getFromContext().getInstantiatedFromUsingEnumDecl(D)) {
  if (Expected<UsingEnumDecl *> ToPatternOrErr = import(FromPattern))
    Importer.getToContext().setInstantiatedFromUsingEnumDecl(ToUsingEnum,
                                                             *ToPatternOrErr);
  else
    return ToPatternOrErr.takeError();
}

return ImportUsingShadowDecls(D, ToUsingEnum);
4718}

4720ExpectedDecl ASTNodeImporter::VisitUsingShadowDecl(UsingShadowDecl *D) {
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD = nullptr;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

Expected<BaseUsingDecl *> ToIntroducerOrErr = import(D->getIntroducer());
if (!ToIntroducerOrErr)
  return ToIntroducerOrErr.takeError();

Expected<NamedDecl *> ToTargetOrErr = import(D->getTargetDecl());
if (!ToTargetOrErr)
  return ToTargetOrErr.takeError();

UsingShadowDecl *ToShadow;
if (GetImportedOrCreateDecl(ToShadow, D, Importer.getToContext(), DC, Loc,
                            Name, *ToIntroducerOrErr, *ToTargetOrErr))
  return ToShadow;

ToShadow->setLexicalDeclContext(LexicalDC);
ToShadow->setAccess(D->getAccess());

if (UsingShadowDecl *FromPattern =
    Importer.getFromContext().getInstantiatedFromUsingShadowDecl(D)) {
  if (Expected<UsingShadowDecl *> ToPatternOrErr = import(FromPattern))
    Importer.getToContext().setInstantiatedFromUsingShadowDecl(
        ToShadow, *ToPatternOrErr);
  else
    // FIXME: We return error here but the definition is already created
    // and available with lookups. How to fix this?..
    return ToPatternOrErr.takeError();
}

LexicalDC->addDeclInternal(ToShadow);

return ToShadow;
4760}

4762ExpectedDecl ASTNodeImporter::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD = nullptr;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

auto ToComAncestorOrErr = Importer.ImportContext(D->getCommonAncestor());
if (!ToComAncestorOrErr)
  return ToComAncestorOrErr.takeError();

Error Err = Error::success();
auto ToNominatedNamespace = importChecked(Err, D->getNominatedNamespace());
auto ToUsingLoc = importChecked(Err, D->getUsingLoc());
auto ToNamespaceKeyLocation =
    importChecked(Err, D->getNamespaceKeyLocation());
auto ToQualifierLoc = importChecked(Err, D->getQualifierLoc());
auto ToIdentLocation = importChecked(Err, D->getIdentLocation());
if (Err)
  return std::move(Err);

UsingDirectiveDecl *ToUsingDir;
if (GetImportedOrCreateDecl(ToUsingDir, D, Importer.getToContext(), DC,
                            ToUsingLoc,
                            ToNamespaceKeyLocation,
                            ToQualifierLoc,
                            ToIdentLocation,
                            ToNominatedNamespace, *ToComAncestorOrErr))
  return ToUsingDir;

ToUsingDir->setLexicalDeclContext(LexicalDC);
LexicalDC->addDeclInternal(ToUsingDir);

return ToUsingDir;
4799}

4801ExpectedDecl ASTNodeImporter::VisitUnresolvedUsingValueDecl(
  UnresolvedUsingValueDecl *D) {
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD = nullptr;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

Error Err = Error::success();
auto ToLoc = importChecked(Err, D->getNameInfo().getLoc());
auto ToUsingLoc = importChecked(Err, D->getUsingLoc());
auto ToQualifierLoc = importChecked(Err, D->getQualifierLoc());
auto ToEllipsisLoc = importChecked(Err, D->getEllipsisLoc());
if (Err)
  return std::move(Err);

DeclarationNameInfo NameInfo(Name, ToLoc);
if (Error Err = ImportDeclarationNameLoc(D->getNameInfo(), NameInfo))
  return std::move(Err);

UnresolvedUsingValueDecl *ToUsingValue;
if (GetImportedOrCreateDecl(ToUsingValue, D, Importer.getToContext(), DC,
                            ToUsingLoc, ToQualifierLoc, NameInfo,
                            ToEllipsisLoc))
  return ToUsingValue;

ToUsingValue->setAccess(D->getAccess());
ToUsingValue->setLexicalDeclContext(LexicalDC);
LexicalDC->addDeclInternal(ToUsingValue);

return ToUsingValue;
4835}

4837ExpectedDecl ASTNodeImporter::VisitUnresolvedUsingTypenameDecl(
  UnresolvedUsingTypenameDecl *D) {
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD = nullptr;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

Error Err = Error::success();
auto ToUsingLoc = importChecked(Err, D->getUsingLoc());
auto ToTypenameLoc = importChecked(Err, D->getTypenameLoc());
auto ToQualifierLoc = importChecked(Err, D->getQualifierLoc());
auto ToEllipsisLoc = importChecked(Err, D->getEllipsisLoc());
if (Err)
  return std::move(Err);

UnresolvedUsingTypenameDecl *ToUsing;
if (GetImportedOrCreateDecl(ToUsing, D, Importer.getToContext(), DC,
                            ToUsingLoc, ToTypenameLoc,
                            ToQualifierLoc, Loc, Name, ToEllipsisLoc))
  return ToUsing;

ToUsing->setAccess(D->getAccess());
ToUsing->setLexicalDeclContext(LexicalDC);
LexicalDC->addDeclInternal(ToUsing);

return ToUsing;
4867}

4869ExpectedDecl ASTNodeImporter::VisitBuiltinTemplateDecl(BuiltinTemplateDecl *D) {
Decl* ToD = nullptr;
switch (D->getBuiltinTemplateKind()) {
case BuiltinTemplateKind::BTK__make_integer_seq:
  ToD = Importer.getToContext().getMakeIntegerSeqDecl();
  break;
case BuiltinTemplateKind::BTK__type_pack_element:
  ToD = Importer.getToContext().getTypePackElementDecl();
  break;
}
assert(ToD && "BuiltinTemplateDecl of unsupported kind!")((void)0);
Importer.MapImported(D, ToD);
return ToD;
4882}

4884Error ASTNodeImporter::ImportDefinition(
  ObjCInterfaceDecl *From, ObjCInterfaceDecl *To, ImportDefinitionKind Kind) {
if (To->getDefinition()) {
  // Check consistency of superclass.
  ObjCInterfaceDecl *FromSuper = From->getSuperClass();
  if (FromSuper) {
    if (auto FromSuperOrErr = import(FromSuper))
      FromSuper = *FromSuperOrErr;
    else
      return FromSuperOrErr.takeError();
  }

  ObjCInterfaceDecl *ToSuper = To->getSuperClass();
  if ((bool)FromSuper != (bool)ToSuper ||
      (FromSuper && !declaresSameEntity(FromSuper, ToSuper))) {
    Importer.ToDiag(To->getLocation(),
                    diag::warn_odr_objc_superclass_inconsistent)
      << To->getDeclName();
    if (ToSuper)
      Importer.ToDiag(To->getSuperClassLoc(), diag::note_odr_objc_superclass)
        << To->getSuperClass()->getDeclName();
    else
      Importer.ToDiag(To->getLocation(),
                      diag::note_odr_objc_missing_superclass);
    if (From->getSuperClass())
      Importer.FromDiag(From->getSuperClassLoc(),
                        diag::note_odr_objc_superclass)
      << From->getSuperClass()->getDeclName();
    else
      Importer.FromDiag(From->getLocation(),
                        diag::note_odr_objc_missing_superclass);
  }

  if (shouldForceImportDeclContext(Kind))
    if (Error Err = ImportDeclContext(From))
      return Err;
  return Error::success();
}

// Start the definition.
To->startDefinition();

// If this class has a superclass, import it.
if (From->getSuperClass()) {
  if (auto SuperTInfoOrErr = import(From->getSuperClassTInfo()))
    To->setSuperClass(*SuperTInfoOrErr);
  else
    return SuperTInfoOrErr.takeError();
}

// Import protocols
SmallVector<ObjCProtocolDecl *, 4> Protocols;
SmallVector<SourceLocation, 4> ProtocolLocs;
ObjCInterfaceDecl::protocol_loc_iterator FromProtoLoc =
    From->protocol_loc_begin();

for (ObjCInterfaceDecl::protocol_iterator FromProto = From->protocol_begin(),
                                       FromProtoEnd = From->protocol_end();
     FromProto != FromProtoEnd;
     ++FromProto, ++FromProtoLoc) {
  if (Expected<ObjCProtocolDecl *> ToProtoOrErr = import(*FromProto))
    Protocols.push_back(*ToProtoOrErr);
  else
    return ToProtoOrErr.takeError();

  if (ExpectedSLoc ToProtoLocOrErr = import(*FromProtoLoc))
    ProtocolLocs.push_back(*ToProtoLocOrErr);
  else
    return ToProtoLocOrErr.takeError();

}

// FIXME: If we're merging, make sure that the protocol list is the same.
To->setProtocolList(Protocols.data(), Protocols.size(),
                    ProtocolLocs.data(), Importer.getToContext());

// Import categories. When the categories themselves are imported, they'll
// hook themselves into this interface.
for (auto *Cat : From->known_categories()) {
  auto ToCatOrErr = import(Cat);
  if (!ToCatOrErr)
    return ToCatOrErr.takeError();
}

// If we have an @implementation, import it as well.
if (From->getImplementation()) {
  if (Expected<ObjCImplementationDecl *> ToImplOrErr =
      import(From->getImplementation()))
    To->setImplementation(*ToImplOrErr);
  else
    return ToImplOrErr.takeError();
}

// Import all of the members of this class.
if (Error Err = ImportDeclContext(From, /*ForceImport=*/true))
  return Err;

return Error::success();
4982}

4984Expected<ObjCTypeParamList *>
4985ASTNodeImporter::ImportObjCTypeParamList(ObjCTypeParamList *list) {
if (!list)
  return nullptr;

SmallVector<ObjCTypeParamDecl *, 4> toTypeParams;
for (auto *fromTypeParam : *list) {
  if (auto toTypeParamOrErr = import(fromTypeParam))
    toTypeParams.push_back(*toTypeParamOrErr);
  else
    return toTypeParamOrErr.takeError();
}

auto LAngleLocOrErr = import(list->getLAngleLoc());
if (!LAngleLocOrErr)
  return LAngleLocOrErr.takeError();

auto RAngleLocOrErr = import(list->getRAngleLoc());
if (!RAngleLocOrErr)
  return RAngleLocOrErr.takeError();

return ObjCTypeParamList::create(Importer.getToContext(),
                                 *LAngleLocOrErr,
                                 toTypeParams,
                                 *RAngleLocOrErr);
5009}

5011ExpectedDecl ASTNodeImporter::VisitObjCInterfaceDecl(ObjCInterfaceDecl *D) {
// If this class has a definition in the translation unit we're coming from,
// but this particular declaration is not that definition, import the
// definition and map to that.
ObjCInterfaceDecl *Definition = D->getDefinition();
if (Definition && Definition != D) {
  if (ExpectedDecl ImportedDefOrErr = import(Definition))
    return Importer.MapImported(D, *ImportedDefOrErr);
  else
    return ImportedDefOrErr.takeError();
}

// Import the major distinguishing characteristics of an @interface.
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

// Look for an existing interface with the same name.
ObjCInterfaceDecl *MergeWithIface = nullptr;
auto FoundDecls = Importer.findDeclsInToCtx(DC, Name);
for (auto *FoundDecl : FoundDecls) {
  if (!FoundDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary))
    continue;

  if ((MergeWithIface = dyn_cast<ObjCInterfaceDecl>(FoundDecl)))
    break;
}

// Create an interface declaration, if one does not already exist.
ObjCInterfaceDecl *ToIface = MergeWithIface;
if (!ToIface) {
  ExpectedSLoc AtBeginLocOrErr = import(D->getAtStartLoc());
  if (!AtBeginLocOrErr)
    return AtBeginLocOrErr.takeError();

  if (GetImportedOrCreateDecl(
          ToIface, D, Importer.getToContext(), DC,
          *AtBeginLocOrErr, Name.getAsIdentifierInfo(),
          /*TypeParamList=*/nullptr,
          /*PrevDecl=*/nullptr, Loc, D->isImplicitInterfaceDecl()))
    return ToIface;
  ToIface->setLexicalDeclContext(LexicalDC);
  LexicalDC->addDeclInternal(ToIface);
}
Importer.MapImported(D, ToIface);
// Import the type parameter list after MapImported, to avoid
// loops when bringing in their DeclContext.
if (auto ToPListOrErr =
    ImportObjCTypeParamList(D->getTypeParamListAsWritten()))
  ToIface->setTypeParamList(*ToPListOrErr);
else
  return ToPListOrErr.takeError();

if (D->isThisDeclarationADefinition())
  if (Error Err = ImportDefinition(D, ToIface))
    return std::move(Err);

return ToIface;
5074}

5076ExpectedDecl
5077ASTNodeImporter::VisitObjCCategoryImplDecl(ObjCCategoryImplDecl *D) {
ObjCCategoryDecl *Category;
if (Error Err = importInto(Category, D->getCategoryDecl()))
  return std::move(Err);

ObjCCategoryImplDecl *ToImpl = Category->getImplementation();
if (!ToImpl) {
  DeclContext *DC, *LexicalDC;
  if (Error Err = ImportDeclContext(D, DC, LexicalDC))
    return std::move(Err);

  Error Err = Error::success();
  auto ToLocation = importChecked(Err, D->getLocation());
  auto ToAtStartLoc = importChecked(Err, D->getAtStartLoc());
  auto ToCategoryNameLoc = importChecked(Err, D->getCategoryNameLoc());
  if (Err)
    return std::move(Err);

  if (GetImportedOrCreateDecl(
          ToImpl, D, Importer.getToContext(), DC,
          Importer.Import(D->getIdentifier()), Category->getClassInterface(),
          ToLocation, ToAtStartLoc, ToCategoryNameLoc))
    return ToImpl;

  ToImpl->setLexicalDeclContext(LexicalDC);
  LexicalDC->addDeclInternal(ToImpl);
  Category->setImplementation(ToImpl);
}

Importer.MapImported(D, ToImpl);
if (Error Err = ImportDeclContext(D))
  return std::move(Err);

return ToImpl;
5111}

5113ExpectedDecl
5114ASTNodeImporter::VisitObjCImplementationDecl(ObjCImplementationDecl *D) {
// Find the corresponding interface.
ObjCInterfaceDecl *Iface;
if (Error Err = importInto(Iface, D->getClassInterface()))
  return std::move(Err);

// Import the superclass, if any.
ObjCInterfaceDecl *Super;
if (Error Err = importInto(Super, D->getSuperClass()))
  return std::move(Err);

ObjCImplementationDecl *Impl = Iface->getImplementation();
if (!Impl) {
  // We haven't imported an implementation yet. Create a new @implementation
  // now.
  DeclContext *DC, *LexicalDC;
  if (Error Err = ImportDeclContext(D, DC, LexicalDC))
    return std::move(Err);

  Error Err = Error::success();
  auto ToLocation = importChecked(Err, D->getLocation());
  auto ToAtStartLoc = importChecked(Err, D->getAtStartLoc());
  auto ToSuperClassLoc = importChecked(Err, D->getSuperClassLoc());
  auto ToIvarLBraceLoc = importChecked(Err, D->getIvarLBraceLoc());
  auto ToIvarRBraceLoc = importChecked(Err, D->getIvarRBraceLoc());
  if (Err)
    return std::move(Err);

  if (GetImportedOrCreateDecl(Impl, D, Importer.getToContext(),
                              DC, Iface, Super,
                              ToLocation,
                              ToAtStartLoc,
                              ToSuperClassLoc,
                              ToIvarLBraceLoc,
                              ToIvarRBraceLoc))
    return Impl;

  Impl->setLexicalDeclContext(LexicalDC);

  // Associate the implementation with the class it implements.
  Iface->setImplementation(Impl);
  Importer.MapImported(D, Iface->getImplementation());
} else {
  Importer.MapImported(D, Iface->getImplementation());

  // Verify that the existing @implementation has the same superclass.
  if ((Super && !Impl->getSuperClass()) ||
      (!Super && Impl->getSuperClass()) ||
      (Super && Impl->getSuperClass() &&
       !declaresSameEntity(Super->getCanonicalDecl(),
                           Impl->getSuperClass()))) {
    Importer.ToDiag(Impl->getLocation(),
                    diag::warn_odr_objc_superclass_inconsistent)
      << Iface->getDeclName();
    // FIXME: It would be nice to have the location of the superclass
    // below.
    if (Impl->getSuperClass())
      Importer.ToDiag(Impl->getLocation(),
                      diag::note_odr_objc_superclass)
      << Impl->getSuperClass()->getDeclName();
    else
      Importer.ToDiag(Impl->getLocation(),
                      diag::note_odr_objc_missing_superclass);
    if (D->getSuperClass())
      Importer.FromDiag(D->getLocation(),
                        diag::note_odr_objc_superclass)
      << D->getSuperClass()->getDeclName();
    else
      Importer.FromDiag(D->getLocation(),
                        diag::note_odr_objc_missing_superclass);

    return make_error<ImportError>(ImportError::NameConflict);
  }
}

// Import all of the members of this @implementation.
if (Error Err = ImportDeclContext(D))
  return std::move(Err);

return Impl;
5194}

5196ExpectedDecl ASTNodeImporter::VisitObjCPropertyDecl(ObjCPropertyDecl *D) {
// Import the major distinguishing characteristics of an @property.
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

// Check whether we have already imported this property.
auto FoundDecls = Importer.findDeclsInToCtx(DC, Name);
for (auto *FoundDecl : FoundDecls) {
  if (auto *FoundProp = dyn_cast<ObjCPropertyDecl>(FoundDecl)) {
    // Instance and class properties can share the same name but are different
    // declarations.
    if (FoundProp->isInstanceProperty() != D->isInstanceProperty())
      continue;

    // Check property types.
    if (!Importer.IsStructurallyEquivalent(D->getType(),
                                           FoundProp->getType())) {
      Importer.ToDiag(Loc, diag::warn_odr_objc_property_type_inconsistent)
        << Name << D->getType() << FoundProp->getType();
      Importer.ToDiag(FoundProp->getLocation(), diag::note_odr_value_here)
        << FoundProp->getType();

      return make_error<ImportError>(ImportError::NameConflict);
    }

    // FIXME: Check property attributes, getters, setters, etc.?

    // Consider these properties to be equivalent.
    Importer.MapImported(D, FoundProp);
    return FoundProp;
  }
}

Error Err = Error::success();
auto ToType = importChecked(Err, D->getType());
auto ToTypeSourceInfo = importChecked(Err, D->getTypeSourceInfo());
auto ToAtLoc = importChecked(Err, D->getAtLoc());
auto ToLParenLoc = importChecked(Err, D->getLParenLoc());
if (Err)
  return std::move(Err);

// Create the new property.
ObjCPropertyDecl *ToProperty;
if (GetImportedOrCreateDecl(
        ToProperty, D, Importer.getToContext(), DC, Loc,
        Name.getAsIdentifierInfo(), ToAtLoc,
        ToLParenLoc, ToType,
        ToTypeSourceInfo, D->getPropertyImplementation()))
  return ToProperty;

auto ToGetterName = importChecked(Err, D->getGetterName());
auto ToSetterName = importChecked(Err, D->getSetterName());
auto ToGetterNameLoc = importChecked(Err, D->getGetterNameLoc());
auto ToSetterNameLoc = importChecked(Err, D->getSetterNameLoc());
auto ToGetterMethodDecl = importChecked(Err, D->getGetterMethodDecl());
auto ToSetterMethodDecl = importChecked(Err, D->getSetterMethodDecl());
auto ToPropertyIvarDecl = importChecked(Err, D->getPropertyIvarDecl());
if (Err)
  return std::move(Err);

ToProperty->setLexicalDeclContext(LexicalDC);
LexicalDC->addDeclInternal(ToProperty);

ToProperty->setPropertyAttributes(D->getPropertyAttributes());
ToProperty->setPropertyAttributesAsWritten(
                                    D->getPropertyAttributesAsWritten());
ToProperty->setGetterName(ToGetterName, ToGetterNameLoc);
ToProperty->setSetterName(ToSetterName, ToSetterNameLoc);
ToProperty->setGetterMethodDecl(ToGetterMethodDecl);
ToProperty->setSetterMethodDecl(ToSetterMethodDecl);
ToProperty->setPropertyIvarDecl(ToPropertyIvarDecl);
return ToProperty;
5274}

5276ExpectedDecl
5277ASTNodeImporter::VisitObjCPropertyImplDecl(ObjCPropertyImplDecl *D) {
ObjCPropertyDecl *Property;
if (Error Err = importInto(Property, D->getPropertyDecl()))
  return std::move(Err);

DeclContext *DC, *LexicalDC;
if (Error Err = ImportDeclContext(D, DC, LexicalDC))
  return std::move(Err);

auto *InImpl = cast<ObjCImplDecl>(LexicalDC);

// Import the ivar (for an @synthesize).
ObjCIvarDecl *Ivar = nullptr;
if (Error Err = importInto(Ivar, D->getPropertyIvarDecl()))
  return std::move(Err);

ObjCPropertyImplDecl *ToImpl
  = InImpl->FindPropertyImplDecl(Property->getIdentifier(),
                                 Property->getQueryKind());
if (!ToImpl) {

  Error Err = Error::success();
  auto ToBeginLoc = importChecked(Err, D->getBeginLoc());
  auto ToLocation = importChecked(Err, D->getLocation());
  auto ToPropertyIvarDeclLoc =
      importChecked(Err, D->getPropertyIvarDeclLoc());
  if (Err)
    return std::move(Err);

  if (GetImportedOrCreateDecl(ToImpl, D, Importer.getToContext(), DC,
                              ToBeginLoc,
                              ToLocation, Property,
                              D->getPropertyImplementation(), Ivar,
                              ToPropertyIvarDeclLoc))
    return ToImpl;

  ToImpl->setLexicalDeclContext(LexicalDC);
  LexicalDC->addDeclInternal(ToImpl);
} else {
  // Check that we have the same kind of property implementation (@synthesize
  // vs. @dynamic).
  if (D->getPropertyImplementation() != ToImpl->getPropertyImplementation()) {
    Importer.ToDiag(ToImpl->getLocation(),
                    diag::warn_odr_objc_property_impl_kind_inconsistent)
      << Property->getDeclName()
      << (ToImpl->getPropertyImplementation()
                                            == ObjCPropertyImplDecl::Dynamic);
    Importer.FromDiag(D->getLocation(),
                      diag::note_odr_objc_property_impl_kind)
      << D->getPropertyDecl()->getDeclName()
      << (D->getPropertyImplementation() == ObjCPropertyImplDecl::Dynamic);

    return make_error<ImportError>(ImportError::NameConflict);
  }

  // For @synthesize, check that we have the same
  if (D->getPropertyImplementation() == ObjCPropertyImplDecl::Synthesize &&
      Ivar != ToImpl->getPropertyIvarDecl()) {
    Importer.ToDiag(ToImpl->getPropertyIvarDeclLoc(),
                    diag::warn_odr_objc_synthesize_ivar_inconsistent)
      << Property->getDeclName()
      << ToImpl->getPropertyIvarDecl()->getDeclName()
      << Ivar->getDeclName();
    Importer.FromDiag(D->getPropertyIvarDeclLoc(),
                      diag::note_odr_objc_synthesize_ivar_here)
      << D->getPropertyIvarDecl()->getDeclName();

    return make_error<ImportError>(ImportError::NameConflict);
  }

  // Merge the existing implementation with the new implementation.
  Importer.MapImported(D, ToImpl);
}

return ToImpl;
5352}

5354ExpectedDecl
5355ASTNodeImporter::VisitTemplateTypeParmDecl(TemplateTypeParmDecl *D) {
// For template arguments, we adopt the translation unit as our declaration
// context. This context will be fixed when the actual template declaration
// is created.

ExpectedSLoc BeginLocOrErr = import(D->getBeginLoc());
if (!BeginLocOrErr)
  return BeginLocOrErr.takeError();

ExpectedSLoc LocationOrErr = import(D->getLocation());
if (!LocationOrErr)
  return LocationOrErr.takeError();

TemplateTypeParmDecl *ToD = nullptr;
if (GetImportedOrCreateDecl(
    ToD, D, Importer.getToContext(),
    Importer.getToContext().getTranslationUnitDecl(),
    *BeginLocOrErr, *LocationOrErr,
    D->getDepth(), D->getIndex(), Importer.Import(D->getIdentifier()),
    D->wasDeclaredWithTypename(), D->isParameterPack(),
    D->hasTypeConstraint()))
  return ToD;

// Import the type-constraint
if (const TypeConstraint *TC = D->getTypeConstraint()) {

  Error Err = Error::success();
  auto ToNNS = importChecked(Err, TC->getNestedNameSpecifierLoc());
  auto ToName = importChecked(Err, TC->getConceptNameInfo().getName());
  auto ToNameLoc = importChecked(Err, TC->getConceptNameInfo().getLoc());
  auto ToFoundDecl = importChecked(Err, TC->getFoundDecl());
  auto ToNamedConcept = importChecked(Err, TC->getNamedConcept());
  auto ToIDC = importChecked(Err, TC->getImmediatelyDeclaredConstraint());
  if (Err)
    return std::move(Err);

  TemplateArgumentListInfo ToTAInfo;
  const auto *ASTTemplateArgs = TC->getTemplateArgsAsWritten();
  if (ASTTemplateArgs)
    if (Error Err = ImportTemplateArgumentListInfo(*ASTTemplateArgs,
                                                   ToTAInfo))
      return std::move(Err);

  ToD->setTypeConstraint(ToNNS, DeclarationNameInfo(ToName, ToNameLoc),
      ToFoundDecl, ToNamedConcept,
      ASTTemplateArgs ?
          ASTTemplateArgumentListInfo::Create(Importer.getToContext(),
                                              ToTAInfo) : nullptr,
      ToIDC);
}

if (D->hasDefaultArgument()) {
  Expected<TypeSourceInfo *> ToDefaultArgOrErr =
      import(D->getDefaultArgumentInfo());
  if (!ToDefaultArgOrErr)
    return ToDefaultArgOrErr.takeError();
  ToD->setDefaultArgument(*ToDefaultArgOrErr);
}

return ToD;
5415}

5417ExpectedDecl
5418ASTNodeImporter::VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) {

Error Err = Error::success();
auto ToDeclName = importChecked(Err, D->getDeclName());
auto ToLocation = importChecked(Err, D->getLocation());
auto ToType = importChecked(Err, D->getType());
auto ToTypeSourceInfo = importChecked(Err, D->getTypeSourceInfo());
auto ToInnerLocStart = importChecked(Err, D->getInnerLocStart());
if (Err)
  return std::move(Err);

NonTypeTemplateParmDecl *ToD = nullptr;
if (GetImportedOrCreateDecl(ToD, D, Importer.getToContext(),
                            Importer.getToContext().getTranslationUnitDecl(),
                            ToInnerLocStart, ToLocation, D->getDepth(),
                            D->getPosition(),
                            ToDeclName.getAsIdentifierInfo(), ToType,
                            D->isParameterPack(), ToTypeSourceInfo))
  return ToD;

if (D->hasDefaultArgument()) {
  ExpectedExpr ToDefaultArgOrErr = import(D->getDefaultArgument());
  if (!ToDefaultArgOrErr)
    return ToDefaultArgOrErr.takeError();
  ToD->setDefaultArgument(*ToDefaultArgOrErr);
}

return ToD;
5446}

5448ExpectedDecl
5449ASTNodeImporter::VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl *D) {
// Import the name of this declaration.
auto NameOrErr = import(D->getDeclName());
if (!NameOrErr)
  return NameOrErr.takeError();

// Import the location of this declaration.
ExpectedSLoc LocationOrErr = import(D->getLocation());
if (!LocationOrErr)
  return LocationOrErr.takeError();

// Import template parameters.
auto TemplateParamsOrErr = import(D->getTemplateParameters());
if (!TemplateParamsOrErr)
  return TemplateParamsOrErr.takeError();

TemplateTemplateParmDecl *ToD = nullptr;
if (GetImportedOrCreateDecl(
        ToD, D, Importer.getToContext(),
        Importer.getToContext().getTranslationUnitDecl(), *LocationOrErr,
        D->getDepth(), D->getPosition(), D->isParameterPack(),
        (*NameOrErr).getAsIdentifierInfo(), *TemplateParamsOrErr))
  return ToD;

if (D->hasDefaultArgument()) {
  Expected<TemplateArgumentLoc> ToDefaultArgOrErr =
      import(D->getDefaultArgument());
  if (!ToDefaultArgOrErr)
    return ToDefaultArgOrErr.takeError();
  ToD->setDefaultArgument(Importer.getToContext(), *ToDefaultArgOrErr);
}

return ToD;
5482}

5484// Returns the definition for a (forward) declaration of a TemplateDecl, if
5485// it has any definition in the redecl chain.
5486template <typename T> static auto getTemplateDefinition(T *D) -> T * {
assert(D->getTemplatedDecl() && "Should be called on templates only")((void)0);
auto *ToTemplatedDef = D->getTemplatedDecl()->getDefinition();
if (!ToTemplatedDef)
  return nullptr;
auto *TemplateWithDef = ToTemplatedDef->getDescribedTemplate();
return cast_or_null<T>(TemplateWithDef);
5493}

5495ExpectedDecl ASTNodeImporter::VisitClassTemplateDecl(ClassTemplateDecl *D) {

// Import the major distinguishing characteristics of this class template.
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

ClassTemplateDecl *FoundByLookup = nullptr;

// We may already have a template of the same name; try to find and match it.
if (!DC->isFunctionOrMethod()) {
  SmallVector<NamedDecl *, 4> ConflictingDecls;
  auto FoundDecls = Importer.findDeclsInToCtx(DC, Name);
  for (auto *FoundDecl : FoundDecls) {
    if (!FoundDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary |
                                            Decl::IDNS_TagFriend))
      continue;

    Decl *Found = FoundDecl;
    auto *FoundTemplate = dyn_cast<ClassTemplateDecl>(Found);
    if (FoundTemplate) {
      if (!hasSameVisibilityContextAndLinkage(FoundTemplate, D))
        continue;

      if (IsStructuralMatch(D, FoundTemplate)) {
        ClassTemplateDecl *TemplateWithDef =
            getTemplateDefinition(FoundTemplate);
        if (D->isThisDeclarationADefinition() && TemplateWithDef)
          return Importer.MapImported(D, TemplateWithDef);
        if (!FoundByLookup)
          FoundByLookup = FoundTemplate;
        // Search in all matches because there may be multiple decl chains,
        // see ASTTests test ImportExistingFriendClassTemplateDef.
        continue;
      }
      ConflictingDecls.push_back(FoundDecl);
    }
  }

  if (!ConflictingDecls.empty()) {
    ExpectedName NameOrErr = Importer.HandleNameConflict(
        Name, DC, Decl::IDNS_Ordinary, ConflictingDecls.data(),
        ConflictingDecls.size());
    if (NameOrErr)
      Name = NameOrErr.get();
    else
      return NameOrErr.takeError();
  }
}

CXXRecordDecl *FromTemplated = D->getTemplatedDecl();

auto TemplateParamsOrErr = import(D->getTemplateParameters());
if (!TemplateParamsOrErr)
  return TemplateParamsOrErr.takeError();

// Create the declaration that is being templated.
CXXRecordDecl *ToTemplated;
if (Error Err = importInto(ToTemplated, FromTemplated))
  return std::move(Err);

// Create the class template declaration itself.
ClassTemplateDecl *D2;
if (GetImportedOrCreateDecl(D2, D, Importer.getToContext(), DC, Loc, Name,
                            *TemplateParamsOrErr, ToTemplated))
  return D2;

ToTemplated->setDescribedClassTemplate(D2);

D2->setAccess(D->getAccess());
D2->setLexicalDeclContext(LexicalDC);

addDeclToContexts(D, D2);
updateLookupTableForTemplateParameters(**TemplateParamsOrErr);

if (FoundByLookup) {
  auto *Recent =
      const_cast<ClassTemplateDecl *>(FoundByLookup->getMostRecentDecl());

  // It is possible that during the import of the class template definition
  // we start the import of a fwd friend decl of the very same class template
  // and we add the fwd friend decl to the lookup table. But the ToTemplated
  // had been created earlier and by that time the lookup could not find
  // anything existing, so it has no previous decl. Later, (still during the
  // import of the fwd friend decl) we start to import the definition again
  // and this time the lookup finds the previous fwd friend class template.
  // In this case we must set up the previous decl for the templated decl.
  if (!ToTemplated->getPreviousDecl()) {
    assert(FoundByLookup->getTemplatedDecl() &&((void)0)
           "Found decl must have its templated decl set")((void)0);
    CXXRecordDecl *PrevTemplated =
        FoundByLookup->getTemplatedDecl()->getMostRecentDecl();
    if (ToTemplated != PrevTemplated)
      ToTemplated->setPreviousDecl(PrevTemplated);
  }

  D2->setPreviousDecl(Recent);
}

if (FromTemplated->isCompleteDefinition() &&
    !ToTemplated->isCompleteDefinition()) {
  // FIXME: Import definition!
}

return D2;
5605}

5607ExpectedDecl ASTNodeImporter::VisitClassTemplateSpecializationDecl(
                                        ClassTemplateSpecializationDecl *D) {
ClassTemplateDecl *ClassTemplate;
if (Error Err = importInto(ClassTemplate, D->getSpecializedTemplate()))
  return std::move(Err);

// Import the context of this declaration.
DeclContext *DC, *LexicalDC;
if (Error Err = ImportDeclContext(D, DC, LexicalDC))
  return std::move(Err);

// Import template arguments.
SmallVector<TemplateArgument, 2> TemplateArgs;
if (Error Err = ImportTemplateArguments(
    D->getTemplateArgs().data(), D->getTemplateArgs().size(), TemplateArgs))
  return std::move(Err);
// Try to find an existing specialization with these template arguments and
// template parameter list.
void *InsertPos = nullptr;
ClassTemplateSpecializationDecl *PrevDecl = nullptr;
ClassTemplatePartialSpecializationDecl *PartialSpec =
          dyn_cast<ClassTemplatePartialSpecializationDecl>(D);

// Import template parameters.
TemplateParameterList *ToTPList = nullptr;

if (PartialSpec) {
  auto ToTPListOrErr = import(PartialSpec->getTemplateParameters());
  if (!ToTPListOrErr)
    return ToTPListOrErr.takeError();
  ToTPList = *ToTPListOrErr;
  PrevDecl = ClassTemplate->findPartialSpecialization(TemplateArgs,
                                                      *ToTPListOrErr,
                                                      InsertPos);
} else
  PrevDecl = ClassTemplate->findSpecialization(TemplateArgs, InsertPos);

if (PrevDecl) {
  if (IsStructuralMatch(D, PrevDecl)) {
    CXXRecordDecl *PrevDefinition = PrevDecl->getDefinition();
    if (D->isThisDeclarationADefinition() && PrevDefinition) {
      Importer.MapImported(D, PrevDefinition);
      // Import those default field initializers which have been
      // instantiated in the "From" context, but not in the "To" context.
      for (auto *FromField : D->fields()) {
        auto ToOrErr = import(FromField);
        if (!ToOrErr)
          return ToOrErr.takeError();
      }

      // Import those methods which have been instantiated in the
      // "From" context, but not in the "To" context.
      for (CXXMethodDecl *FromM : D->methods()) {
        auto ToOrErr = import(FromM);
        if (!ToOrErr)
          return ToOrErr.takeError();
      }

      // TODO Import instantiated default arguments.
      // TODO Import instantiated exception specifications.
      //
      // Generally, ASTCommon.h/DeclUpdateKind enum gives a very good hint
      // what else could be fused during an AST merge.
      return PrevDefinition;
    }
  } else { // ODR violation.
    // FIXME HandleNameConflict
    return make_error<ImportError>(ImportError::NameConflict);
  }
}

// Import the location of this declaration.
ExpectedSLoc BeginLocOrErr = import(D->getBeginLoc());
if (!BeginLocOrErr)
  return BeginLocOrErr.takeError();
ExpectedSLoc IdLocOrErr = import(D->getLocation());
if (!IdLocOrErr)
  return IdLocOrErr.takeError();

// Create the specialization.
ClassTemplateSpecializationDecl *D2 = nullptr;
if (PartialSpec) {
  // Import TemplateArgumentListInfo.
  TemplateArgumentListInfo ToTAInfo;
  const auto &ASTTemplateArgs = *PartialSpec->getTemplateArgsAsWritten();
  if (Error Err = ImportTemplateArgumentListInfo(ASTTemplateArgs, ToTAInfo))
    return std::move(Err);

  QualType CanonInjType;
  if (Error Err = importInto(
      CanonInjType, PartialSpec->getInjectedSpecializationType()))
    return std::move(Err);
  CanonInjType = CanonInjType.getCanonicalType();

  if (GetImportedOrCreateDecl<ClassTemplatePartialSpecializationDecl>(
          D2, D, Importer.getToContext(), D->getTagKind(), DC,
          *BeginLocOrErr, *IdLocOrErr, ToTPList, ClassTemplate,
          llvm::makeArrayRef(TemplateArgs.data(), TemplateArgs.size()),
          ToTAInfo, CanonInjType,
          cast_or_null<ClassTemplatePartialSpecializationDecl>(PrevDecl)))
    return D2;

  // Update InsertPos, because preceding import calls may have invalidated
  // it by adding new specializations.
  auto *PartSpec2 = cast<ClassTemplatePartialSpecializationDecl>(D2);
  if (!ClassTemplate->findPartialSpecialization(TemplateArgs, ToTPList,
                                                InsertPos))
    // Add this partial specialization to the class template.
    ClassTemplate->AddPartialSpecialization(PartSpec2, InsertPos);

  updateLookupTableForTemplateParameters(*ToTPList);
} else { // Not a partial specialization.
  if (GetImportedOrCreateDecl(
          D2, D, Importer.getToContext(), D->getTagKind(), DC,
          *BeginLocOrErr, *IdLocOrErr, ClassTemplate, TemplateArgs,
          PrevDecl))
    return D2;

  // Update InsertPos, because preceding import calls may have invalidated
  // it by adding new specializations.
  if (!ClassTemplate->findSpecialization(TemplateArgs, InsertPos))
    // Add this specialization to the class template.
    ClassTemplate->AddSpecialization(D2, InsertPos);
}

D2->setSpecializationKind(D->getSpecializationKind());

// Set the context of this specialization/instantiation.
D2->setLexicalDeclContext(LexicalDC);

// Add to the DC only if it was an explicit specialization/instantiation.
if (D2->isExplicitInstantiationOrSpecialization()) {
  LexicalDC->addDeclInternal(D2);
}

if (auto BraceRangeOrErr = import(D->getBraceRange()))
  D2->setBraceRange(*BraceRangeOrErr);
else
  return BraceRangeOrErr.takeError();

// Import the qualifier, if any.
if (auto LocOrErr = import(D->getQualifierLoc()))
  D2->setQualifierInfo(*LocOrErr);
else
  return LocOrErr.takeError();

if (auto *TSI = D->getTypeAsWritten()) {
  if (auto TInfoOrErr = import(TSI))
    D2->setTypeAsWritten(*TInfoOrErr);
  else
    return TInfoOrErr.takeError();

  if (auto LocOrErr = import(D->getTemplateKeywordLoc()))
    D2->setTemplateKeywordLoc(*LocOrErr);
  else
    return LocOrErr.takeError();

  if (auto LocOrErr = import(D->getExternLoc()))
    D2->setExternLoc(*LocOrErr);
  else
    return LocOrErr.takeError();
}

if (D->getPointOfInstantiation().isValid()) {
  if (auto POIOrErr = import(D->getPointOfInstantiation()))
    D2->setPointOfInstantiation(*POIOrErr);
  else
    return POIOrErr.takeError();
}

D2->setTemplateSpecializationKind(D->getTemplateSpecializationKind());

if (D->isCompleteDefinition())
  if (Error Err = ImportDefinition(D, D2))
    return std::move(Err);

return D2;
5784}

5786ExpectedDecl ASTNodeImporter::VisitVarTemplateDecl(VarTemplateDecl *D) {
// Import the major distinguishing characteristics of this variable template.
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD;
if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);
if (ToD)
  return ToD;

// We may already have a template of the same name; try to find and match it.
assert(!DC->isFunctionOrMethod() &&((void)0)
       "Variable templates cannot be declared at function scope")((void)0);

SmallVector<NamedDecl *, 4> ConflictingDecls;
auto FoundDecls = Importer.findDeclsInToCtx(DC, Name);
VarTemplateDecl *FoundByLookup = nullptr;
for (auto *FoundDecl : FoundDecls) {
  if (!FoundDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary))
    continue;

  if (VarTemplateDecl *FoundTemplate = dyn_cast<VarTemplateDecl>(FoundDecl)) {
    // Use the templated decl, some linkage flags are set only there.
    if (!hasSameVisibilityContextAndLinkage(FoundTemplate->getTemplatedDecl(),
                                            D->getTemplatedDecl()))
      continue;
    if (IsStructuralMatch(D, FoundTemplate)) {
      // The Decl in the "From" context has a definition, but in the
      // "To" context we already have a definition.
      VarTemplateDecl *FoundDef = getTemplateDefinition(FoundTemplate);
      if (D->isThisDeclarationADefinition() && FoundDef)
        // FIXME Check for ODR error if the two definitions have
        // different initializers?
        return Importer.MapImported(D, FoundDef);

      FoundByLookup = FoundTemplate;
      break;
    }
    ConflictingDecls.push_back(FoundDecl);
  }
}

if (!ConflictingDecls.empty()) {
  ExpectedName NameOrErr = Importer.HandleNameConflict(
      Name, DC, Decl::IDNS_Ordinary, ConflictingDecls.data(),
      ConflictingDecls.size());
  if (NameOrErr)
    Name = NameOrErr.get();
  else
    return NameOrErr.takeError();
}

VarDecl *DTemplated = D->getTemplatedDecl();

// Import the type.
// FIXME: Value not used?
ExpectedType TypeOrErr = import(DTemplated->getType());
if (!TypeOrErr)
  return TypeOrErr.takeError();

// Create the declaration that is being templated.
VarDecl *ToTemplated;
if (Error Err = importInto(ToTemplated, DTemplated))
  return std::move(Err);

// Create the variable template declaration itself.
auto TemplateParamsOrErr = import(D->getTemplateParameters());
if (!TemplateParamsOrErr)
  return TemplateParamsOrErr.takeError();

VarTemplateDecl *ToVarTD;
if (GetImportedOrCreateDecl(ToVarTD, D, Importer.getToContext(), DC, Loc,
                            Name, *TemplateParamsOrErr, ToTemplated))
  return ToVarTD;

ToTemplated->setDescribedVarTemplate(ToVarTD);

ToVarTD->setAccess(D->getAccess());
ToVarTD->setLexicalDeclContext(LexicalDC);
LexicalDC->addDeclInternal(ToVarTD);
if (DC != Importer.getToContext().getTranslationUnitDecl())
  updateLookupTableForTemplateParameters(**TemplateParamsOrErr);

if (FoundByLookup) {
  auto *Recent =
      const_cast<VarTemplateDecl *>(FoundByLookup->getMostRecentDecl());
  if (!ToTemplated->getPreviousDecl()) {
    auto *PrevTemplated =
        FoundByLookup->getTemplatedDecl()->getMostRecentDecl();
    if (ToTemplated != PrevTemplated)
      ToTemplated->setPreviousDecl(PrevTemplated);
  }
  ToVarTD->setPreviousDecl(Recent);
}

if (DTemplated->isThisDeclarationADefinition() &&
    !ToTemplated->isThisDeclarationADefinition()) {
  // FIXME: Import definition!
}

return ToVarTD;
5888}

5890ExpectedDecl ASTNodeImporter::VisitVarTemplateSpecializationDecl(
  VarTemplateSpecializationDecl *D) {
// If this record has a definition in the translation unit we're coming from,
// but this particular declaration is not that definition, import the
// definition and map to that.
VarDecl *Definition = D->getDefinition();
if (Definition && Definition != D) {
  if (ExpectedDecl ImportedDefOrErr = import(Definition))
    return Importer.MapImported(D, *ImportedDefOrErr);
  else
    return ImportedDefOrErr.takeError();
}

VarTemplateDecl *VarTemplate = nullptr;
if (Error Err = importInto(VarTemplate, D->getSpecializedTemplate()))
  return std::move(Err);

// Import the context of this declaration.
DeclContext *DC, *LexicalDC;
if (Error Err = ImportDeclContext(D, DC, LexicalDC))
  return std::move(Err);

// Import the location of this declaration.
ExpectedSLoc BeginLocOrErr = import(D->getBeginLoc());
if (!BeginLocOrErr)
  return BeginLocOrErr.takeError();

auto IdLocOrErr = import(D->getLocation());
if (!IdLocOrErr)
  return IdLocOrErr.takeError();

// Import template arguments.
SmallVector<TemplateArgument, 2> TemplateArgs;
if (Error Err = ImportTemplateArguments(
    D->getTemplateArgs().data(), D->getTemplateArgs().size(), TemplateArgs))
  return std::move(Err);

// Try to find an existing specialization with these template arguments.
void *InsertPos = nullptr;
VarTemplateSpecializationDecl *D2 = VarTemplate->findSpecialization(
    TemplateArgs, InsertPos);
if (D2) {
  // We already have a variable template specialization with these template
  // arguments.

  // FIXME: Check for specialization vs. instantiation errors.

  if (VarDecl *FoundDef = D2->getDefinition()) {
    if (!D->isThisDeclarationADefinition() ||
        IsStructuralMatch(D, FoundDef)) {
      // The record types structurally match, or the "from" translation
      // unit only had a forward declaration anyway; call it the same
      // variable.
      return Importer.MapImported(D, FoundDef);
    }
  }
} else {
  // Import the type.
  QualType T;
  if (Error Err = importInto(T, D->getType()))
    return std::move(Err);

  auto TInfoOrErr = import(D->getTypeSourceInfo());
  if (!TInfoOrErr)
    return TInfoOrErr.takeError();

  TemplateArgumentListInfo ToTAInfo;
  if (Error Err = ImportTemplateArgumentListInfo(
      D->getTemplateArgsInfo(), ToTAInfo))
    return std::move(Err);

  using PartVarSpecDecl = VarTemplatePartialSpecializationDecl;
  // Create a new specialization.
  if (auto *FromPartial = dyn_cast<PartVarSpecDecl>(D)) {
    // Import TemplateArgumentListInfo
    TemplateArgumentListInfo ArgInfos;
    const auto *FromTAArgsAsWritten = FromPartial->getTemplateArgsAsWritten();
    // NOTE: FromTAArgsAsWritten and template parameter list are non-null.
    if (Error Err = ImportTemplateArgumentListInfo(
        *FromTAArgsAsWritten, ArgInfos))
      return std::move(Err);

    auto ToTPListOrErr = import(FromPartial->getTemplateParameters());
    if (!ToTPListOrErr)
      return ToTPListOrErr.takeError();

    PartVarSpecDecl *ToPartial;
    if (GetImportedOrCreateDecl(ToPartial, D, Importer.getToContext(), DC,
                                *BeginLocOrErr, *IdLocOrErr, *ToTPListOrErr,
                                VarTemplate, T, *TInfoOrErr,
                                D->getStorageClass(), TemplateArgs, ArgInfos))
      return ToPartial;

    if (Expected<PartVarSpecDecl *> ToInstOrErr = import(
        FromPartial->getInstantiatedFromMember()))
      ToPartial->setInstantiatedFromMember(*ToInstOrErr);
    else
      return ToInstOrErr.takeError();

    if (FromPartial->isMemberSpecialization())
      ToPartial->setMemberSpecialization();

    D2 = ToPartial;

    // FIXME: Use this update if VarTemplatePartialSpecializationDecl is fixed
    // to adopt template parameters.
    // updateLookupTableForTemplateParameters(**ToTPListOrErr);
  } else { // Full specialization
    if (GetImportedOrCreateDecl(D2, D, Importer.getToContext(), DC,
                                *BeginLocOrErr, *IdLocOrErr, VarTemplate,
                                T, *TInfoOrErr,
                                D->getStorageClass(), TemplateArgs))
      return D2;
  }

  if (D->getPointOfInstantiation().isValid()) {
    if (ExpectedSLoc POIOrErr = import(D->getPointOfInstantiation()))
      D2->setPointOfInstantiation(*POIOrErr);
    else
      return POIOrErr.takeError();
  }

  D2->setSpecializationKind(D->getSpecializationKind());
  D2->setTemplateArgsInfo(ToTAInfo);

  // Add this specialization to the class template.
  VarTemplate->AddSpecialization(D2, InsertPos);

  // Import the qualifier, if any.
  if (auto LocOrErr = import(D->getQualifierLoc()))
    D2->setQualifierInfo(*LocOrErr);
  else
    return LocOrErr.takeError();

  if (D->isConstexpr())
    D2->setConstexpr(true);

  // Add the specialization to this context.
  D2->setLexicalDeclContext(LexicalDC);
  LexicalDC->addDeclInternal(D2);

  D2->setAccess(D->getAccess());
}

if (Error Err = ImportInitializer(D, D2))
  return std::move(Err);

return D2;
6038}

6040ExpectedDecl
6041ASTNodeImporter::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
DeclContext *DC, *LexicalDC;
DeclarationName Name;
SourceLocation Loc;
NamedDecl *ToD;

if (Error Err = ImportDeclParts(D, DC, LexicalDC, Name, ToD, Loc))
  return std::move(Err);

if (ToD)
  return ToD;

const FunctionTemplateDecl *FoundByLookup = nullptr;

// Try to find a function in our own ("to") context with the same name, same
// type, and in the same context as the function we're importing.
// FIXME Split this into a separate function.
if (!LexicalDC->isFunctionOrMethod()) {
  unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_OrdinaryFriend;
  auto FoundDecls = Importer.findDeclsInToCtx(DC, Name);
  for (auto *FoundDecl : FoundDecls) {
    if (!FoundDecl->isInIdentifierNamespace(IDNS))
      continue;

    if (auto *FoundTemplate = dyn_cast<FunctionTemplateDecl>(FoundDecl)) {
      if (!hasSameVisibilityContextAndLinkage(FoundTemplate, D))
        continue;
      if (IsStructuralMatch(D, FoundTemplate)) {
        FunctionTemplateDecl *TemplateWithDef =
            getTemplateDefinition(FoundTemplate);
        if (D->isThisDeclarationADefinition() && TemplateWithDef)
          return Importer.MapImported(D, TemplateWithDef);

        FoundByLookup = FoundTemplate;
        break;
        // TODO: handle conflicting names
      }
    }
  }
}

auto ParamsOrErr = import(D->getTemplateParameters());
if (!ParamsOrErr)
  return ParamsOrErr.takeError();
TemplateParameterList *Params = *ParamsOrErr;

FunctionDecl *TemplatedFD;
if (Error Err = importInto(TemplatedFD, D->getTemplatedDecl()))
  return std::move(Err);

// Template parameters of the ClassTemplateDecl and FunctionTemplateDecl are
// shared, if the FunctionTemplateDecl is a deduction guide for the class.
// At import the ClassTemplateDecl object is always created first (FIXME: is
// this really true?) because the dependency, then the FunctionTemplateDecl.
// The DeclContext of the template parameters is changed when the
// FunctionTemplateDecl is created, but was set already when the class
// template was created. So here it is not the TU (default value) any more.
// FIXME: The DeclContext of the parameters is now set finally to the
// CXXDeductionGuideDecl object that was imported later. This may not be the
// same that is in the original AST, specially if there are multiple deduction
// guides.
DeclContext *OldParamDC = nullptr;
if (Params->size() > 0)
  OldParamDC = Params->getParam(0)->getDeclContext();

FunctionTemplateDecl *ToFunc;
if (GetImportedOrCreateDecl(ToFunc, D, Importer.getToContext(), DC, Loc, Name,
                            Params, TemplatedFD))
  return ToFunc;

TemplatedFD->setDescribedFunctionTemplate(ToFunc);

ToFunc->setAccess(D->getAccess());
ToFunc->setLexicalDeclContext(LexicalDC);
LexicalDC->addDeclInternal(ToFunc);
updateLookupTableForTemplateParameters(*Params, OldParamDC);

if (FoundByLookup) {
  auto *Recent =
      const_cast<FunctionTemplateDecl *>(FoundByLookup->getMostRecentDecl());
  if (!TemplatedFD->getPreviousDecl()) {
    assert(FoundByLookup->getTemplatedDecl() &&((void)0)
           "Found decl must have its templated decl set")((void)0);
    auto *PrevTemplated =
        FoundByLookup->getTemplatedDecl()->getMostRecentDecl();
    if (TemplatedFD != PrevTemplated)
      TemplatedFD->setPreviousDecl(PrevTemplated);
  }
  ToFunc->setPreviousDecl(Recent);
}

return ToFunc;
6133}

6135//----------------------------------------------------------------------------
6136// Import Statements
6137//----------------------------------------------------------------------------

6139ExpectedStmt ASTNodeImporter::VisitStmt(Stmt *S) {
Importer.FromDiag(S->getBeginLoc(), diag::err_unsupported_ast_node)
    << S->getStmtClassName();
return make_error<ImportError>(ImportError::UnsupportedConstruct);
6143}


6146ExpectedStmt ASTNodeImporter::VisitGCCAsmStmt(GCCAsmStmt *S) {
if (Importer.returnWithErrorInTest())
  return make_error<ImportError>(ImportError::UnsupportedConstruct);
SmallVector<IdentifierInfo *, 4> Names;
for (unsigned I = 0, E = S->getNumOutputs(); I != E; I++) {
  IdentifierInfo *ToII = Importer.Import(S->getOutputIdentifier(I));
  // ToII is nullptr when no symbolic name is given for output operand
  // see ParseStmtAsm::ParseAsmOperandsOpt
  Names.push_back(ToII);
}

for (unsigned I = 0, E = S->getNumInputs(); I != E; I++) {
  IdentifierInfo *ToII = Importer.Import(S->getInputIdentifier(I));
  // ToII is nullptr when no symbolic name is given for input operand
  // see ParseStmtAsm::ParseAsmOperandsOpt
  Names.push_back(ToII);
}

SmallVector<StringLiteral *, 4> Clobbers;
for (unsigned I = 0, E = S->getNumClobbers(); I != E; I++) {
  if (auto ClobberOrErr = import(S->getClobberStringLiteral(I)))
    Clobbers.push_back(*ClobberOrErr);
  else
    return ClobberOrErr.takeError();

}

SmallVector<StringLiteral *, 4> Constraints;
for (unsigned I = 0, E = S->getNumOutputs(); I != E; I++) {
  if (auto OutputOrErr = import(S->getOutputConstraintLiteral(I)))
    Constraints.push_back(*OutputOrErr);
  else
    return OutputOrErr.takeError();
}

for (unsigned I = 0, E = S->getNumInputs(); I != E; I++) {
  if (auto InputOrErr = import(S->getInputConstraintLiteral(I)))
    Constraints.push_back(*InputOrErr);
  else
    return InputOrErr.takeError();
}

SmallVector<Expr *, 4> Exprs(S->getNumOutputs() + S->getNumInputs() +
                             S->getNumLabels());
if (Error Err = ImportContainerChecked(S->outputs(), Exprs))
  return std::move(Err);

if (Error Err =
        ImportArrayChecked(S->inputs(), Exprs.begin() + S->getNumOutputs()))
  return std::move(Err);

if (Error Err = ImportArrayChecked(
        S->labels(), Exprs.begin() + S->getNumOutputs() + S->getNumInputs()))
  return std::move(Err);

ExpectedSLoc AsmLocOrErr = import(S->getAsmLoc());
if (!AsmLocOrErr)
  return AsmLocOrErr.takeError();
auto AsmStrOrErr = import(S->getAsmString());
if (!AsmStrOrErr)
  return AsmStrOrErr.takeError();
ExpectedSLoc RParenLocOrErr = import(S->getRParenLoc());
if (!RParenLocOrErr)
  return RParenLocOrErr.takeError();

return new (Importer.getToContext()) GCCAsmStmt(
    Importer.getToContext(),
    *AsmLocOrErr,
    S->isSimple(),
    S->isVolatile(),
    S->getNumOutputs(),
    S->getNumInputs(),
    Names.data(),
    Constraints.data(),
    Exprs.data(),
    *AsmStrOrErr,
    S->getNumClobbers(),
    Clobbers.data(),
    S->getNumLabels(),
    *RParenLocOrErr);
6226}

6228ExpectedStmt ASTNodeImporter::VisitDeclStmt(DeclStmt *S) {

Error Err = Error::success();
auto ToDG = importChecked(Err, S->getDeclGroup());
auto ToBeginLoc = importChecked(Err, S->getBeginLoc());
auto ToEndLoc = importChecked(Err, S->getEndLoc());
if (Err)
  return std::move(Err);
return new (Importer.getToContext()) DeclStmt(ToDG, ToBeginLoc, ToEndLoc);
6237}

6239ExpectedStmt ASTNodeImporter::VisitNullStmt(NullStmt *S) {
ExpectedSLoc ToSemiLocOrErr = import(S->getSemiLoc());
if (!ToSemiLocOrErr)
  return ToSemiLocOrErr.takeError();
return new (Importer.getToContext()) NullStmt(
    *ToSemiLocOrErr, S->hasLeadingEmptyMacro());
6245}

6247ExpectedStmt ASTNodeImporter::VisitCompoundStmt(CompoundStmt *S) {
SmallVector<Stmt *, 8> ToStmts(S->size());

if (Error Err = ImportContainerChecked(S->body(), ToStmts))
  return std::move(Err);

ExpectedSLoc ToLBracLocOrErr = import(S->getLBracLoc());
if (!ToLBracLocOrErr)
  return ToLBracLocOrErr.takeError();

ExpectedSLoc ToRBracLocOrErr = import(S->getRBracLoc());
if (!ToRBracLocOrErr)
  return ToRBracLocOrErr.takeError();

return CompoundStmt::Create(
    Importer.getToContext(), ToStmts,
    *ToLBracLocOrErr, *ToRBracLocOrErr);
6264}

6266ExpectedStmt ASTNodeImporter::VisitCaseStmt(CaseStmt *S) {

Error Err = Error::success();
auto ToLHS = importChecked(Err, S->getLHS());
auto ToRHS = importChecked(Err, S->getRHS());
auto ToSubStmt = importChecked(Err, S->getSubStmt());
auto ToCaseLoc = importChecked(Err, S->getCaseLoc());
auto ToEllipsisLoc = importChecked(Err, S->getEllipsisLoc());
auto ToColonLoc = importChecked(Err, S->getColonLoc());
if (Err)
  return std::move(Err);

auto *ToStmt = CaseStmt::Create(Importer.getToContext(), ToLHS, ToRHS,
                                ToCaseLoc, ToEllipsisLoc, ToColonLoc);
ToStmt->setSubStmt(ToSubStmt);

return ToStmt;
6283}

6285ExpectedStmt ASTNodeImporter::VisitDefaultStmt(DefaultStmt *S) {

Error Err = Error::success();
auto ToDefaultLoc = importChecked(Err, S->getDefaultLoc());
auto ToColonLoc = importChecked(Err, S->getColonLoc());
auto ToSubStmt = importChecked(Err, S->getSubStmt());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) DefaultStmt(
  ToDefaultLoc, ToColonLoc, ToSubStmt);
6296}

6298ExpectedStmt ASTNodeImporter::VisitLabelStmt(LabelStmt *S) {

Error Err = Error::success();
auto ToIdentLoc = importChecked(Err, S->getIdentLoc());
auto ToLabelDecl = importChecked(Err, S->getDecl());
auto ToSubStmt = importChecked(Err, S->getSubStmt());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) LabelStmt(
    ToIdentLoc, ToLabelDecl, ToSubStmt);
6309}

6311ExpectedStmt ASTNodeImporter::VisitAttributedStmt(AttributedStmt *S) {
ExpectedSLoc ToAttrLocOrErr = import(S->getAttrLoc());
if (!ToAttrLocOrErr)
  return ToAttrLocOrErr.takeError();
ArrayRef<const Attr*> FromAttrs(S->getAttrs());
SmallVector<const Attr *, 1> ToAttrs(FromAttrs.size());
if (Error Err = ImportContainerChecked(FromAttrs, ToAttrs))
  return std::move(Err);
ExpectedStmt ToSubStmtOrErr = import(S->getSubStmt());
if (!ToSubStmtOrErr)
  return ToSubStmtOrErr.takeError();

return AttributedStmt::Create(
    Importer.getToContext(), *ToAttrLocOrErr, ToAttrs, *ToSubStmtOrErr);
6325}

6327ExpectedStmt ASTNodeImporter::VisitIfStmt(IfStmt *S) {

Error Err = Error::success();
auto ToIfLoc = importChecked(Err, S->getIfLoc());
auto ToInit = importChecked(Err, S->getInit());
auto ToConditionVariable = importChecked(Err, S->getConditionVariable());
auto ToCond = importChecked(Err, S->getCond());
auto ToLParenLoc = importChecked(Err, S->getLParenLoc());
auto ToRParenLoc = importChecked(Err, S->getRParenLoc());
auto ToThen = importChecked(Err, S->getThen());
auto ToElseLoc = importChecked(Err, S->getElseLoc());
auto ToElse = importChecked(Err, S->getElse());
if (Err)
  return std::move(Err);

return IfStmt::Create(Importer.getToContext(), ToIfLoc, S->isConstexpr(),
                      ToInit, ToConditionVariable, ToCond, ToLParenLoc,
                      ToRParenLoc, ToThen, ToElseLoc, ToElse);
6345}

6347ExpectedStmt ASTNodeImporter::VisitSwitchStmt(SwitchStmt *S) {

Error Err = Error::success();
auto ToInit = importChecked(Err, S->getInit());
auto ToConditionVariable = importChecked(Err, S->getConditionVariable());
auto ToCond = importChecked(Err, S->getCond());
auto ToLParenLoc = importChecked(Err, S->getLParenLoc());
auto ToRParenLoc = importChecked(Err, S->getRParenLoc());
auto ToBody = importChecked(Err, S->getBody());
auto ToSwitchLoc = importChecked(Err, S->getSwitchLoc());
if (Err)
  return std::move(Err);

auto *ToStmt =
    SwitchStmt::Create(Importer.getToContext(), ToInit, ToConditionVariable,
                       ToCond, ToLParenLoc, ToRParenLoc);
ToStmt->setBody(ToBody);
ToStmt->setSwitchLoc(ToSwitchLoc);

// Now we have to re-chain the cases.
SwitchCase *LastChainedSwitchCase = nullptr;
for (SwitchCase *SC = S->getSwitchCaseList(); SC != nullptr;
     SC = SC->getNextSwitchCase()) {
  Expected<SwitchCase *> ToSCOrErr = import(SC);
  if (!ToSCOrErr)
    return ToSCOrErr.takeError();
  if (LastChainedSwitchCase)
    LastChainedSwitchCase->setNextSwitchCase(*ToSCOrErr);
  else
    ToStmt->setSwitchCaseList(*ToSCOrErr);
  LastChainedSwitchCase = *ToSCOrErr;
}

return ToStmt;
6381}

6383ExpectedStmt ASTNodeImporter::VisitWhileStmt(WhileStmt *S) {

Error Err = Error::success();
auto ToConditionVariable = importChecked(Err, S->getConditionVariable());
auto ToCond = importChecked(Err, S->getCond());
auto ToBody = importChecked(Err, S->getBody());
auto ToWhileLoc = importChecked(Err, S->getWhileLoc());
auto ToLParenLoc = importChecked(Err, S->getLParenLoc());
auto ToRParenLoc = importChecked(Err, S->getRParenLoc());
if (Err)
  return std::move(Err);

return WhileStmt::Create(Importer.getToContext(), ToConditionVariable, ToCond,
                         ToBody, ToWhileLoc, ToLParenLoc, ToRParenLoc);
6397}

6399ExpectedStmt ASTNodeImporter::VisitDoStmt(DoStmt *S) {

Error Err = Error::success();
auto ToBody = importChecked(Err, S->getBody());
auto ToCond = importChecked(Err, S->getCond());
auto ToDoLoc = importChecked(Err, S->getDoLoc());
auto ToWhileLoc = importChecked(Err, S->getWhileLoc());
auto ToRParenLoc = importChecked(Err, S->getRParenLoc());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) DoStmt(
    ToBody, ToCond, ToDoLoc, ToWhileLoc, ToRParenLoc);
6412}

6414ExpectedStmt ASTNodeImporter::VisitForStmt(ForStmt *S) {

Error Err = Error::success();
auto ToInit = importChecked(Err, S->getInit());
auto ToCond = importChecked(Err, S->getCond());
auto ToConditionVariable = importChecked(Err, S->getConditionVariable());
auto ToInc = importChecked(Err, S->getInc());
auto ToBody = importChecked(Err, S->getBody());
auto ToForLoc = importChecked(Err, S->getForLoc());
auto ToLParenLoc = importChecked(Err, S->getLParenLoc());
auto ToRParenLoc = importChecked(Err, S->getRParenLoc());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) ForStmt(
    Importer.getToContext(),
    ToInit, ToCond, ToConditionVariable, ToInc, ToBody, ToForLoc, ToLParenLoc,
    ToRParenLoc);
6432}

6434ExpectedStmt ASTNodeImporter::VisitGotoStmt(GotoStmt *S) {

Error Err = Error::success();
auto ToLabel = importChecked(Err, S->getLabel());
auto ToGotoLoc = importChecked(Err, S->getGotoLoc());
auto ToLabelLoc = importChecked(Err, S->getLabelLoc());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) GotoStmt(
    ToLabel, ToGotoLoc, ToLabelLoc);
6445}

6447ExpectedStmt ASTNodeImporter::VisitIndirectGotoStmt(IndirectGotoStmt *S) {

Error Err = Error::success();
auto ToGotoLoc = importChecked(Err, S->getGotoLoc());
auto ToStarLoc = importChecked(Err, S->getStarLoc());
auto ToTarget = importChecked(Err, S->getTarget());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) IndirectGotoStmt(
    ToGotoLoc, ToStarLoc, ToTarget);
6458}

6460ExpectedStmt ASTNodeImporter::VisitContinueStmt(ContinueStmt *S) {
ExpectedSLoc ToContinueLocOrErr = import(S->getContinueLoc());
if (!ToContinueLocOrErr)
  return ToContinueLocOrErr.takeError();
return new (Importer.getToContext()) ContinueStmt(*ToContinueLocOrErr);
6465}

6467ExpectedStmt ASTNodeImporter::VisitBreakStmt(BreakStmt *S) {
auto ToBreakLocOrErr = import(S->getBreakLoc());
if (!ToBreakLocOrErr)
  return ToBreakLocOrErr.takeError();
return new (Importer.getToContext()) BreakStmt(*ToBreakLocOrErr);
6472}

6474ExpectedStmt ASTNodeImporter::VisitReturnStmt(ReturnStmt *S) {

Error Err = Error::success();
auto ToReturnLoc = importChecked(Err, S->getReturnLoc());
auto ToRetValue = importChecked(Err, S->getRetValue());
auto ToNRVOCandidate = importChecked(Err, S->getNRVOCandidate());
if (Err)
  return std::move(Err);

return ReturnStmt::Create(Importer.getToContext(), ToReturnLoc, ToRetValue,
                          ToNRVOCandidate);
6485}

6487ExpectedStmt ASTNodeImporter::VisitCXXCatchStmt(CXXCatchStmt *S) {

Error Err = Error::success();
auto ToCatchLoc = importChecked(Err, S->getCatchLoc());
auto ToExceptionDecl = importChecked(Err, S->getExceptionDecl());
auto ToHandlerBlock = importChecked(Err, S->getHandlerBlock());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) CXXCatchStmt (
    ToCatchLoc, ToExceptionDecl, ToHandlerBlock);
6498}

6500ExpectedStmt ASTNodeImporter::VisitCXXTryStmt(CXXTryStmt *S) {
ExpectedSLoc ToTryLocOrErr = import(S->getTryLoc());
if (!ToTryLocOrErr)
  return ToTryLocOrErr.takeError();

ExpectedStmt ToTryBlockOrErr = import(S->getTryBlock());
if (!ToTryBlockOrErr)
  return ToTryBlockOrErr.takeError();

SmallVector<Stmt *, 1> ToHandlers(S->getNumHandlers());
for (unsigned HI = 0, HE = S->getNumHandlers(); HI != HE; ++HI) {
  CXXCatchStmt *FromHandler = S->getHandler(HI);
  if (auto ToHandlerOrErr = import(FromHandler))
    ToHandlers[HI] = *ToHandlerOrErr;
  else
    return ToHandlerOrErr.takeError();
}

return CXXTryStmt::Create(
    Importer.getToContext(), *ToTryLocOrErr,*ToTryBlockOrErr, ToHandlers);
6520}

6522ExpectedStmt ASTNodeImporter::VisitCXXForRangeStmt(CXXForRangeStmt *S) {

Error Err = Error::success();
auto ToInit = importChecked(Err, S->getInit());
auto ToRangeStmt = importChecked(Err, S->getRangeStmt());
auto ToBeginStmt = importChecked(Err, S->getBeginStmt());
auto ToEndStmt = importChecked(Err, S->getEndStmt());
auto ToCond = importChecked(Err, S->getCond());
auto ToInc = importChecked(Err, S->getInc());
auto ToLoopVarStmt = importChecked(Err, S->getLoopVarStmt());
auto ToBody = importChecked(Err, S->getBody());
auto ToForLoc = importChecked(Err, S->getForLoc());
auto ToCoawaitLoc = importChecked(Err, S->getCoawaitLoc());
auto ToColonLoc = importChecked(Err, S->getColonLoc());
auto ToRParenLoc = importChecked(Err, S->getRParenLoc());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) CXXForRangeStmt(
    ToInit, ToRangeStmt, ToBeginStmt, ToEndStmt, ToCond, ToInc, ToLoopVarStmt,
    ToBody, ToForLoc, ToCoawaitLoc, ToColonLoc, ToRParenLoc);
6543}

6545ExpectedStmt
6546ASTNodeImporter::VisitObjCForCollectionStmt(ObjCForCollectionStmt *S) {
Error Err = Error::success();
auto ToElement = importChecked(Err, S->getElement());
auto ToCollection = importChecked(Err, S->getCollection());
auto ToBody = importChecked(Err, S->getBody());
auto ToForLoc = importChecked(Err, S->getForLoc());
auto ToRParenLoc = importChecked(Err, S->getRParenLoc());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) ObjCForCollectionStmt(ToElement,
                                                           ToCollection,
                                                           ToBody,
                                                           ToForLoc,
                                                           ToRParenLoc);
6561}

6563ExpectedStmt ASTNodeImporter::VisitObjCAtCatchStmt(ObjCAtCatchStmt *S) {

Error Err = Error::success();
auto ToAtCatchLoc = importChecked(Err, S->getAtCatchLoc());
auto ToRParenLoc = importChecked(Err, S->getRParenLoc());
auto ToCatchParamDecl = importChecked(Err, S->getCatchParamDecl());
auto ToCatchBody = importChecked(Err, S->getCatchBody());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) ObjCAtCatchStmt (
    ToAtCatchLoc, ToRParenLoc, ToCatchParamDecl, ToCatchBody);
6575}

6577ExpectedStmt ASTNodeImporter::VisitObjCAtFinallyStmt(ObjCAtFinallyStmt *S) {
ExpectedSLoc ToAtFinallyLocOrErr = import(S->getAtFinallyLoc());
if (!ToAtFinallyLocOrErr)
  return ToAtFinallyLocOrErr.takeError();
ExpectedStmt ToAtFinallyStmtOrErr = import(S->getFinallyBody());
if (!ToAtFinallyStmtOrErr)
  return ToAtFinallyStmtOrErr.takeError();
return new (Importer.getToContext()) ObjCAtFinallyStmt(*ToAtFinallyLocOrErr,
                                                       *ToAtFinallyStmtOrErr);
6586}

6588ExpectedStmt ASTNodeImporter::VisitObjCAtTryStmt(ObjCAtTryStmt *S) {

Error Err = Error::success();
auto ToAtTryLoc = importChecked(Err, S->getAtTryLoc());
auto ToTryBody = importChecked(Err, S->getTryBody());
auto ToFinallyStmt = importChecked(Err, S->getFinallyStmt());
if (Err)
  return std::move(Err);

SmallVector<Stmt *, 1> ToCatchStmts(S->getNumCatchStmts());
for (unsigned CI = 0, CE = S->getNumCatchStmts(); CI != CE; ++CI) {
  ObjCAtCatchStmt *FromCatchStmt = S->getCatchStmt(CI);
  if (ExpectedStmt ToCatchStmtOrErr = import(FromCatchStmt))
    ToCatchStmts[CI] = *ToCatchStmtOrErr;
  else
    return ToCatchStmtOrErr.takeError();
}

return ObjCAtTryStmt::Create(Importer.getToContext(),
                             ToAtTryLoc, ToTryBody,
                             ToCatchStmts.begin(), ToCatchStmts.size(),
                             ToFinallyStmt);
6610}

6612ExpectedStmt
6613ASTNodeImporter::VisitObjCAtSynchronizedStmt(ObjCAtSynchronizedStmt *S) {

Error Err = Error::success();
auto ToAtSynchronizedLoc = importChecked(Err, S->getAtSynchronizedLoc());
auto ToSynchExpr = importChecked(Err, S->getSynchExpr());
auto ToSynchBody = importChecked(Err, S->getSynchBody());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) ObjCAtSynchronizedStmt(
  ToAtSynchronizedLoc, ToSynchExpr, ToSynchBody);
6624}

6626ExpectedStmt ASTNodeImporter::VisitObjCAtThrowStmt(ObjCAtThrowStmt *S) {
ExpectedSLoc ToThrowLocOrErr = import(S->getThrowLoc());
if (!ToThrowLocOrErr)
  return ToThrowLocOrErr.takeError();
ExpectedExpr ToThrowExprOrErr = import(S->getThrowExpr());
if (!ToThrowExprOrErr)
  return ToThrowExprOrErr.takeError();
return new (Importer.getToContext()) ObjCAtThrowStmt(
    *ToThrowLocOrErr, *ToThrowExprOrErr);
6635}

6637ExpectedStmt ASTNodeImporter::VisitObjCAutoreleasePoolStmt(
  ObjCAutoreleasePoolStmt *S) {
ExpectedSLoc ToAtLocOrErr = import(S->getAtLoc());
if (!ToAtLocOrErr)
  return ToAtLocOrErr.takeError();
ExpectedStmt ToSubStmtOrErr = import(S->getSubStmt());
if (!ToSubStmtOrErr)
  return ToSubStmtOrErr.takeError();
return new (Importer.getToContext()) ObjCAutoreleasePoolStmt(*ToAtLocOrErr,
                                                             *ToSubStmtOrErr);
6647}

6649//----------------------------------------------------------------------------
6650// Import Expressions
6651//----------------------------------------------------------------------------
6652ExpectedStmt ASTNodeImporter::VisitExpr(Expr *E) {
Importer.FromDiag(E->getBeginLoc(), diag::err_unsupported_ast_node)
    << E->getStmtClassName();
return make_error<ImportError>(ImportError::UnsupportedConstruct);
6656}

6658ExpectedStmt ASTNodeImporter::VisitSourceLocExpr(SourceLocExpr *E) {
Error Err = Error::success();
auto BLoc = importChecked(Err, E->getBeginLoc());
auto RParenLoc = importChecked(Err, E->getEndLoc());
if (Err)
  return std::move(Err);
auto ParentContextOrErr = Importer.ImportContext(E->getParentContext());
if (!ParentContextOrErr)
  return ParentContextOrErr.takeError();

return new (Importer.getToContext())
    SourceLocExpr(Importer.getToContext(), E->getIdentKind(), BLoc, RParenLoc,
                  *ParentContextOrErr);
6671}

6673ExpectedStmt ASTNodeImporter::VisitVAArgExpr(VAArgExpr *E) {

Error Err = Error::success();
auto ToBuiltinLoc = importChecked(Err, E->getBuiltinLoc());
auto ToSubExpr = importChecked(Err, E->getSubExpr());
auto ToWrittenTypeInfo = importChecked(Err, E->getWrittenTypeInfo());
auto ToRParenLoc = importChecked(Err, E->getRParenLoc());
auto ToType = importChecked(Err, E->getType());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) VAArgExpr(
    ToBuiltinLoc, ToSubExpr, ToWrittenTypeInfo, ToRParenLoc, ToType,
    E->isMicrosoftABI());
6687}

6689ExpectedStmt ASTNodeImporter::VisitChooseExpr(ChooseExpr *E) {

Error Err = Error::success();
auto ToCond = importChecked(Err, E->getCond());
auto ToLHS = importChecked(Err, E->getLHS());
auto ToRHS = importChecked(Err, E->getRHS());
auto ToBuiltinLoc = importChecked(Err, E->getBuiltinLoc());
auto ToRParenLoc = importChecked(Err, E->getRParenLoc());
auto ToType = importChecked(Err, E->getType());
if (Err)
  return std::move(Err);

ExprValueKind VK = E->getValueKind();
ExprObjectKind OK = E->getObjectKind();

// The value of CondIsTrue only matters if the value is not
// condition-dependent.
bool CondIsTrue = !E->isConditionDependent() && E->isConditionTrue();

return new (Importer.getToContext())
    ChooseExpr(ToBuiltinLoc, ToCond, ToLHS, ToRHS, ToType, VK, OK,
               ToRParenLoc, CondIsTrue);
6711}

6713ExpectedStmt ASTNodeImporter::VisitGNUNullExpr(GNUNullExpr *E) {
ExpectedType TypeOrErr = import(E->getType());
if (!TypeOrErr)
  return TypeOrErr.takeError();

ExpectedSLoc BeginLocOrErr = import(E->getBeginLoc());
if (!BeginLocOrErr)
  return BeginLocOrErr.takeError();

return new (Importer.getToContext()) GNUNullExpr(*TypeOrErr, *BeginLocOrErr);
6723}

6725ExpectedStmt
6726ASTNodeImporter::VisitGenericSelectionExpr(GenericSelectionExpr *E) {
Error Err = Error::success();
auto ToGenericLoc = importChecked(Err, E->getGenericLoc());
auto *ToControllingExpr = importChecked(Err, E->getControllingExpr());
auto ToDefaultLoc = importChecked(Err, E->getDefaultLoc());
auto ToRParenLoc = importChecked(Err, E->getRParenLoc());
if (Err)
  return std::move(Err);

ArrayRef<const TypeSourceInfo *> FromAssocTypes(E->getAssocTypeSourceInfos());
SmallVector<TypeSourceInfo *, 1> ToAssocTypes(FromAssocTypes.size());
if (Error Err = ImportContainerChecked(FromAssocTypes, ToAssocTypes))
  return std::move(Err);

ArrayRef<const Expr *> FromAssocExprs(E->getAssocExprs());
SmallVector<Expr *, 1> ToAssocExprs(FromAssocExprs.size());
if (Error Err = ImportContainerChecked(FromAssocExprs, ToAssocExprs))
  return std::move(Err);

const ASTContext &ToCtx = Importer.getToContext();
if (E->isResultDependent()) {
  return GenericSelectionExpr::Create(
      ToCtx, ToGenericLoc, ToControllingExpr,
      llvm::makeArrayRef(ToAssocTypes), llvm::makeArrayRef(ToAssocExprs),
      ToDefaultLoc, ToRParenLoc, E->containsUnexpandedParameterPack());
}

return GenericSelectionExpr::Create(
    ToCtx, ToGenericLoc, ToControllingExpr, llvm::makeArrayRef(ToAssocTypes),
    llvm::makeArrayRef(ToAssocExprs), ToDefaultLoc, ToRParenLoc,
    E->containsUnexpandedParameterPack(), E->getResultIndex());
6757}

6759ExpectedStmt ASTNodeImporter::VisitPredefinedExpr(PredefinedExpr *E) {

Error Err = Error::success();
auto ToBeginLoc = importChecked(Err, E->getBeginLoc());
auto ToType = importChecked(Err, E->getType());
auto ToFunctionName = importChecked(Err, E->getFunctionName());
if (Err)
  return std::move(Err);

return PredefinedExpr::Create(Importer.getToContext(), ToBeginLoc, ToType,
                              E->getIdentKind(), ToFunctionName);
6770}

6772ExpectedStmt ASTNodeImporter::VisitDeclRefExpr(DeclRefExpr *E) {

Error Err = Error::success();
auto ToQualifierLoc = importChecked(Err, E->getQualifierLoc());
auto ToTemplateKeywordLoc = importChecked(Err, E->getTemplateKeywordLoc());
auto ToDecl = importChecked(Err, E->getDecl());
auto ToLocation = importChecked(Err, E->getLocation());
auto ToType = importChecked(Err, E->getType());
if (Err)
  return std::move(Err);

NamedDecl *ToFoundD = nullptr;
if (E->getDecl() != E->getFoundDecl()) {
  auto FoundDOrErr = import(E->getFoundDecl());
  if (!FoundDOrErr)
    return FoundDOrErr.takeError();
  ToFoundD = *FoundDOrErr;
}

TemplateArgumentListInfo ToTAInfo;
TemplateArgumentListInfo *ToResInfo = nullptr;
if (E->hasExplicitTemplateArgs()) {
  if (Error Err =
          ImportTemplateArgumentListInfo(E->getLAngleLoc(), E->getRAngleLoc(),
                                         E->template_arguments(), ToTAInfo))
    return std::move(Err);
  ToResInfo = &ToTAInfo;
}

auto *ToE = DeclRefExpr::Create(
    Importer.getToContext(), ToQualifierLoc, ToTemplateKeywordLoc, ToDecl,
    E->refersToEnclosingVariableOrCapture(), ToLocation, ToType,
    E->getValueKind(), ToFoundD, ToResInfo, E->isNonOdrUse());
if (E->hadMultipleCandidates())
  ToE->setHadMultipleCandidates(true);
return ToE;
6808}

6810ExpectedStmt ASTNodeImporter::VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) {
ExpectedType TypeOrErr = import(E->getType());
if (!TypeOrErr)
  return TypeOrErr.takeError();

return new (Importer.getToContext()) ImplicitValueInitExpr(*TypeOrErr);
6816}

6818ExpectedStmt ASTNodeImporter::VisitDesignatedInitExpr(DesignatedInitExpr *E) {
ExpectedExpr ToInitOrErr = import(E->getInit());
if (!ToInitOrErr)
  return ToInitOrErr.takeError();

ExpectedSLoc ToEqualOrColonLocOrErr = import(E->getEqualOrColonLoc());
if (!ToEqualOrColonLocOrErr)
  return ToEqualOrColonLocOrErr.takeError();

SmallVector<Expr *, 4> ToIndexExprs(E->getNumSubExprs() - 1);
// List elements from the second, the first is Init itself
for (unsigned I = 1, N = E->getNumSubExprs(); I < N; I++) {
  if (ExpectedExpr ToArgOrErr = import(E->getSubExpr(I)))
    ToIndexExprs[I - 1] = *ToArgOrErr;
  else
    return ToArgOrErr.takeError();
}

SmallVector<Designator, 4> ToDesignators(E->size());
if (Error Err = ImportContainerChecked(E->designators(), ToDesignators))
  return std::move(Err);

return DesignatedInitExpr::Create(
      Importer.getToContext(), ToDesignators,
      ToIndexExprs, *ToEqualOrColonLocOrErr,
      E->usesGNUSyntax(), *ToInitOrErr);
6844}

6846ExpectedStmt
6847ASTNodeImporter::VisitCXXNullPtrLiteralExpr(CXXNullPtrLiteralExpr *E) {
ExpectedType ToTypeOrErr = import(E->getType());
if (!ToTypeOrErr)
  return ToTypeOrErr.takeError();

ExpectedSLoc ToLocationOrErr = import(E->getLocation());
if (!ToLocationOrErr)
  return ToLocationOrErr.takeError();

return new (Importer.getToContext()) CXXNullPtrLiteralExpr(
    *ToTypeOrErr, *ToLocationOrErr);
6858}

6860ExpectedStmt ASTNodeImporter::VisitIntegerLiteral(IntegerLiteral *E) {
ExpectedType ToTypeOrErr = import(E->getType());
if (!ToTypeOrErr)
  return ToTypeOrErr.takeError();

ExpectedSLoc ToLocationOrErr = import(E->getLocation());
if (!ToLocationOrErr)
  return ToLocationOrErr.takeError();

return IntegerLiteral::Create(
    Importer.getToContext(), E->getValue(), *ToTypeOrErr, *ToLocationOrErr);
6871}


6874ExpectedStmt ASTNodeImporter::VisitFloatingLiteral(FloatingLiteral *E) {
ExpectedType ToTypeOrErr = import(E->getType());
if (!ToTypeOrErr)
  return ToTypeOrErr.takeError();

ExpectedSLoc ToLocationOrErr = import(E->getLocation());
if (!ToLocationOrErr)
  return ToLocationOrErr.takeError();

return FloatingLiteral::Create(
    Importer.getToContext(), E->getValue(), E->isExact(),
    *ToTypeOrErr, *ToLocationOrErr);
6886}

6888ExpectedStmt ASTNodeImporter::VisitImaginaryLiteral(ImaginaryLiteral *E) {
auto ToTypeOrErr = import(E->getType());
if (!ToTypeOrErr)
  return ToTypeOrErr.takeError();

ExpectedExpr ToSubExprOrErr = import(E->getSubExpr());
if (!ToSubExprOrErr)
  return ToSubExprOrErr.takeError();

return new (Importer.getToContext()) ImaginaryLiteral(
    *ToSubExprOrErr, *ToTypeOrErr);
6899}

6901ExpectedStmt ASTNodeImporter::VisitFixedPointLiteral(FixedPointLiteral *E) {
auto ToTypeOrErr = import(E->getType());
if (!ToTypeOrErr)
  return ToTypeOrErr.takeError();

ExpectedSLoc ToLocationOrErr = import(E->getLocation());
if (!ToLocationOrErr)
  return ToLocationOrErr.takeError();

return new (Importer.getToContext()) FixedPointLiteral(
    Importer.getToContext(), E->getValue(), *ToTypeOrErr, *ToLocationOrErr,
    Importer.getToContext().getFixedPointScale(*ToTypeOrErr));
6913}

6915ExpectedStmt ASTNodeImporter::VisitCharacterLiteral(CharacterLiteral *E) {
ExpectedType ToTypeOrErr = import(E->getType());
if (!ToTypeOrErr)
  return ToTypeOrErr.takeError();

ExpectedSLoc ToLocationOrErr = import(E->getLocation());
if (!ToLocationOrErr)
  return ToLocationOrErr.takeError();

return new (Importer.getToContext()) CharacterLiteral(
    E->getValue(), E->getKind(), *ToTypeOrErr, *ToLocationOrErr);
6926}

6928ExpectedStmt ASTNodeImporter::VisitStringLiteral(StringLiteral *E) {
ExpectedType ToTypeOrErr = import(E->getType());
if (!ToTypeOrErr)
  return ToTypeOrErr.takeError();

SmallVector<SourceLocation, 4> ToLocations(E->getNumConcatenated());
if (Error Err = ImportArrayChecked(
    E->tokloc_begin(), E->tokloc_end(), ToLocations.begin()))
  return std::move(Err);

return StringLiteral::Create(
    Importer.getToContext(), E->getBytes(), E->getKind(), E->isPascal(),
    *ToTypeOrErr, ToLocations.data(), ToLocations.size());
6941}

6943ExpectedStmt ASTNodeImporter::VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {

Error Err = Error::success();
auto ToLParenLoc = importChecked(Err, E->getLParenLoc());
auto ToTypeSourceInfo = importChecked(Err, E->getTypeSourceInfo());
auto ToType = importChecked(Err, E->getType());
auto ToInitializer = importChecked(Err, E->getInitializer());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) CompoundLiteralExpr(
      ToLParenLoc, ToTypeSourceInfo, ToType, E->getValueKind(),
      ToInitializer, E->isFileScope());
6956}

6958ExpectedStmt ASTNodeImporter::VisitAtomicExpr(AtomicExpr *E) {

Error Err = Error::success();
auto ToBuiltinLoc = importChecked(Err, E->getBuiltinLoc());
auto ToType = importChecked(Err, E->getType());
auto ToRParenLoc = importChecked(Err, E->getRParenLoc());
if (Err)
  return std::move(Err);

SmallVector<Expr *, 6> ToExprs(E->getNumSubExprs());
if (Error Err = ImportArrayChecked(
    E->getSubExprs(), E->getSubExprs() + E->getNumSubExprs(),
    ToExprs.begin()))
  return std::move(Err);

return new (Importer.getToContext()) AtomicExpr(

    ToBuiltinLoc, ToExprs, ToType, E->getOp(), ToRParenLoc);
6976}

6978ExpectedStmt ASTNodeImporter::VisitAddrLabelExpr(AddrLabelExpr *E) {
Error Err = Error::success();
auto ToAmpAmpLoc = importChecked(Err, E->getAmpAmpLoc());
auto ToLabelLoc = importChecked(Err, E->getLabelLoc());
auto ToLabel = importChecked(Err, E->getLabel());
auto ToType = importChecked(Err, E->getType());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) AddrLabelExpr(
    ToAmpAmpLoc, ToLabelLoc, ToLabel, ToType);
6989}
6990ExpectedStmt ASTNodeImporter::VisitConstantExpr(ConstantExpr *E) {
Error Err = Error::success();
auto ToSubExpr = importChecked(Err, E->getSubExpr());
auto ToResult = importChecked(Err, E->getAPValueResult());
if (Err)
  return std::move(Err);

return ConstantExpr::Create(Importer.getToContext(), ToSubExpr, ToResult);
6998}
6999ExpectedStmt ASTNodeImporter::VisitParenExpr(ParenExpr *E) {
Error Err = Error::success();
auto ToLParen = importChecked(Err, E->getLParen());
auto ToRParen = importChecked(Err, E->getRParen());
auto ToSubExpr = importChecked(Err, E->getSubExpr());
if (Err)
  return std::move(Err);

return new (Importer.getToContext())
    ParenExpr(ToLParen, ToRParen, ToSubExpr);
7009}

7011ExpectedStmt ASTNodeImporter::VisitParenListExpr(ParenListExpr *E) {
SmallVector<Expr *, 4> ToExprs(E->getNumExprs());
if (Error Err = ImportContainerChecked(E->exprs(), ToExprs))
  return std::move(Err);

ExpectedSLoc ToLParenLocOrErr = import(E->getLParenLoc());
if (!ToLParenLocOrErr)
  return ToLParenLocOrErr.takeError();

ExpectedSLoc ToRParenLocOrErr = import(E->getRParenLoc());
if (!ToRParenLocOrErr)
  return ToRParenLocOrErr.takeError();

return ParenListExpr::Create(Importer.getToContext(), *ToLParenLocOrErr,
                             ToExprs, *ToRParenLocOrErr);
7026}

7028ExpectedStmt ASTNodeImporter::VisitStmtExpr(StmtExpr *E) {
Error Err = Error::success();
auto ToSubStmt = importChecked(Err, E->getSubStmt());
auto ToType = importChecked(Err, E->getType());
auto ToLParenLoc = importChecked(Err, E->getLParenLoc());
auto ToRParenLoc = importChecked(Err, E->getRParenLoc());
if (Err)
  return std::move(Err);

return new (Importer.getToContext())
    StmtExpr(ToSubStmt, ToType, ToLParenLoc, ToRParenLoc,
             E->getTemplateDepth());
7040}

7042ExpectedStmt ASTNodeImporter::VisitUnaryOperator(UnaryOperator *E) {
Error Err = Error::success();
auto ToSubExpr = importChecked(Err, E->getSubExpr());
auto ToType = importChecked(Err, E->getType());
auto ToOperatorLoc = importChecked(Err, E->getOperatorLoc());
if (Err)
  return std::move(Err);

return UnaryOperator::Create(
    Importer.getToContext(), ToSubExpr, E->getOpcode(), ToType,
    E->getValueKind(), E->getObjectKind(), ToOperatorLoc, E->canOverflow(),
    E->getFPOptionsOverride());
7054}

7056ExpectedStmt

7058ASTNodeImporter::VisitUnaryExprOrTypeTraitExpr(UnaryExprOrTypeTraitExpr *E) {
Error Err = Error::success();
auto ToType = importChecked(Err, E->getType());
auto ToOperatorLoc = importChecked(Err, E->getOperatorLoc());
auto ToRParenLoc = importChecked(Err, E->getRParenLoc());
if (Err)
  return std::move(Err);

if (E->isArgumentType()) {
  Expected<TypeSourceInfo *> ToArgumentTypeInfoOrErr =
      import(E->getArgumentTypeInfo());
  if (!ToArgumentTypeInfoOrErr)
    return ToArgumentTypeInfoOrErr.takeError();

  return new (Importer.getToContext()) UnaryExprOrTypeTraitExpr(
      E->getKind(), *ToArgumentTypeInfoOrErr, ToType, ToOperatorLoc,
      ToRParenLoc);
}

ExpectedExpr ToArgumentExprOrErr = import(E->getArgumentExpr());
if (!ToArgumentExprOrErr)
  return ToArgumentExprOrErr.takeError();

return new (Importer.getToContext()) UnaryExprOrTypeTraitExpr(
    E->getKind(), *ToArgumentExprOrErr, ToType, ToOperatorLoc, ToRParenLoc);
7083}

7085ExpectedStmt ASTNodeImporter::VisitBinaryOperator(BinaryOperator *E) {
Error Err = Error::success();
auto ToLHS = importChecked(Err, E->getLHS());
auto ToRHS = importChecked(Err, E->getRHS());
auto ToType = importChecked(Err, E->getType());
auto ToOperatorLoc = importChecked(Err, E->getOperatorLoc());
if (Err)
  return std::move(Err);

return BinaryOperator::Create(
    Importer.getToContext(), ToLHS, ToRHS, E->getOpcode(), ToType,
    E->getValueKind(), E->getObjectKind(), ToOperatorLoc,
    E->getFPFeatures(Importer.getFromContext().getLangOpts()));
7098}

7100ExpectedStmt ASTNodeImporter::VisitConditionalOperator(ConditionalOperator *E) {
Error Err = Error::success();
auto ToCond = importChecked(Err, E->getCond());
auto ToQuestionLoc = importChecked(Err, E->getQuestionLoc());
auto ToLHS = importChecked(Err, E->getLHS());
auto ToColonLoc = importChecked(Err, E->getColonLoc());
auto ToRHS = importChecked(Err, E->getRHS());
auto ToType = importChecked(Err, E->getType());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) ConditionalOperator(
    ToCond, ToQuestionLoc, ToLHS, ToColonLoc, ToRHS, ToType,
    E->getValueKind(), E->getObjectKind());
7114}

7116ExpectedStmt
7117ASTNodeImporter::VisitBinaryConditionalOperator(BinaryConditionalOperator *E) {
Error Err = Error::success();
auto ToCommon = importChecked(Err, E->getCommon());
auto ToOpaqueValue = importChecked(Err, E->getOpaqueValue());
auto ToCond = importChecked(Err, E->getCond());
auto ToTrueExpr = importChecked(Err, E->getTrueExpr());
auto ToFalseExpr = importChecked(Err, E->getFalseExpr());
auto ToQuestionLoc = importChecked(Err, E->getQuestionLoc());
auto ToColonLoc = importChecked(Err, E->getColonLoc());
auto ToType = importChecked(Err, E->getType());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) BinaryConditionalOperator(
    ToCommon, ToOpaqueValue, ToCond, ToTrueExpr, ToFalseExpr,
    ToQuestionLoc, ToColonLoc, ToType, E->getValueKind(),
    E->getObjectKind());
7134}

7136ExpectedStmt ASTNodeImporter::VisitArrayTypeTraitExpr(ArrayTypeTraitExpr *E) {
Error Err = Error::success();
auto ToBeginLoc = importChecked(Err, E->getBeginLoc());
auto ToQueriedTypeSourceInfo =
    importChecked(Err, E->getQueriedTypeSourceInfo());
auto ToDimensionExpression = importChecked(Err, E->getDimensionExpression());
auto ToEndLoc = importChecked(Err, E->getEndLoc());
auto ToType = importChecked(Err, E->getType());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) ArrayTypeTraitExpr(
    ToBeginLoc, E->getTrait(), ToQueriedTypeSourceInfo, E->getValue(),
    ToDimensionExpression, ToEndLoc, ToType);
7150}

7152ExpectedStmt ASTNodeImporter::VisitExpressionTraitExpr(ExpressionTraitExpr *E) {
Error Err = Error::success();
auto ToBeginLoc = importChecked(Err, E->getBeginLoc());
auto ToQueriedExpression = importChecked(Err, E->getQueriedExpression());
auto ToEndLoc = importChecked(Err, E->getEndLoc());
auto ToType = importChecked(Err, E->getType());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) ExpressionTraitExpr(
    ToBeginLoc, E->getTrait(), ToQueriedExpression, E->getValue(),
    ToEndLoc, ToType);
7164}

7166ExpectedStmt ASTNodeImporter::VisitOpaqueValueExpr(OpaqueValueExpr *E) {
Error Err = Error::success();
auto ToLocation = importChecked(Err, E->getLocation());
auto ToType = importChecked(Err, E->getType());
auto ToSourceExpr = importChecked(Err, E->getSourceExpr());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) OpaqueValueExpr(
    ToLocation, ToType, E->getValueKind(), E->getObjectKind(), ToSourceExpr);
7176}

7178ExpectedStmt ASTNodeImporter::VisitArraySubscriptExpr(ArraySubscriptExpr *E) {
Error Err = Error::success();
auto ToLHS = importChecked(Err, E->getLHS());
auto ToRHS = importChecked(Err, E->getRHS());
auto ToType = importChecked(Err, E->getType());
auto ToRBracketLoc = importChecked(Err, E->getRBracketLoc());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) ArraySubscriptExpr(
    ToLHS, ToRHS, ToType, E->getValueKind(), E->getObjectKind(),
    ToRBracketLoc);
7190}

7192ExpectedStmt
7193ASTNodeImporter::VisitCompoundAssignOperator(CompoundAssignOperator *E) {
Error Err = Error::success();
auto ToLHS = importChecked(Err, E->getLHS());
auto ToRHS = importChecked(Err, E->getRHS());
auto ToType = importChecked(Err, E->getType());
auto ToComputationLHSType = importChecked(Err, E->getComputationLHSType());
auto ToComputationResultType =
    importChecked(Err, E->getComputationResultType());
auto ToOperatorLoc = importChecked(Err, E->getOperatorLoc());
if (Err)
  return std::move(Err);

return CompoundAssignOperator::Create(
    Importer.getToContext(), ToLHS, ToRHS, E->getOpcode(), ToType,
    E->getValueKind(), E->getObjectKind(), ToOperatorLoc,
    E->getFPFeatures(Importer.getFromContext().getLangOpts()),
    ToComputationLHSType, ToComputationResultType);
7210}

7212Expected<CXXCastPath>
7213ASTNodeImporter::ImportCastPath(CastExpr *CE) {
CXXCastPath Path;
for (auto I = CE->path_begin(), E = CE->path_end(); I != E; ++I) {
  if (auto SpecOrErr = import(*I))
    Path.push_back(*SpecOrErr);
  else
    return SpecOrErr.takeError();
}
return Path;
7222}

7224ExpectedStmt ASTNodeImporter::VisitImplicitCastExpr(ImplicitCastExpr *E) {
ExpectedType ToTypeOrErr = import(E->getType());
if (!ToTypeOrErr)
  return ToTypeOrErr.takeError();

ExpectedExpr ToSubExprOrErr = import(E->getSubExpr());
if (!ToSubExprOrErr)
  return ToSubExprOrErr.takeError();

Expected<CXXCastPath> ToBasePathOrErr = ImportCastPath(E);
if (!ToBasePathOrErr)
  return ToBasePathOrErr.takeError();

return ImplicitCastExpr::Create(
    Importer.getToContext(), *ToTypeOrErr, E->getCastKind(), *ToSubExprOrErr,
    &(*ToBasePathOrErr), E->getValueKind(), E->getFPFeatures());
7240}

7242ExpectedStmt ASTNodeImporter::VisitExplicitCastExpr(ExplicitCastExpr *E) {
Error Err = Error::success();
auto ToType = importChecked(Err, E->getType());
auto ToSubExpr = importChecked(Err, E->getSubExpr());
auto ToTypeInfoAsWritten = importChecked(Err, E->getTypeInfoAsWritten());
if (Err)
  return std::move(Err);

Expected<CXXCastPath> ToBasePathOrErr = ImportCastPath(E);
if (!ToBasePathOrErr)
  return ToBasePathOrErr.takeError();
CXXCastPath *ToBasePath = &(*ToBasePathOrErr);

switch (E->getStmtClass()) {
case Stmt::CStyleCastExprClass: {
  auto *CCE = cast<CStyleCastExpr>(E);
  ExpectedSLoc ToLParenLocOrErr = import(CCE->getLParenLoc());
  if (!ToLParenLocOrErr)
    return ToLParenLocOrErr.takeError();
  ExpectedSLoc ToRParenLocOrErr = import(CCE->getRParenLoc());
  if (!ToRParenLocOrErr)
    return ToRParenLocOrErr.takeError();
  return CStyleCastExpr::Create(
      Importer.getToContext(), ToType, E->getValueKind(), E->getCastKind(),
      ToSubExpr, ToBasePath, CCE->getFPFeatures(), ToTypeInfoAsWritten,
      *ToLParenLocOrErr, *ToRParenLocOrErr);
}

case Stmt::CXXFunctionalCastExprClass: {
  auto *FCE = cast<CXXFunctionalCastExpr>(E);
  ExpectedSLoc ToLParenLocOrErr = import(FCE->getLParenLoc());
  if (!ToLParenLocOrErr)
    return ToLParenLocOrErr.takeError();
  ExpectedSLoc ToRParenLocOrErr = import(FCE->getRParenLoc());
  if (!ToRParenLocOrErr)
    return ToRParenLocOrErr.takeError();
  return CXXFunctionalCastExpr::Create(
      Importer.getToContext(), ToType, E->getValueKind(), ToTypeInfoAsWritten,
      E->getCastKind(), ToSubExpr, ToBasePath, FCE->getFPFeatures(),
      *ToLParenLocOrErr, *ToRParenLocOrErr);
}

case Stmt::ObjCBridgedCastExprClass: {
  auto *OCE = cast<ObjCBridgedCastExpr>(E);
  ExpectedSLoc ToLParenLocOrErr = import(OCE->getLParenLoc());
  if (!ToLParenLocOrErr)
    return ToLParenLocOrErr.takeError();
  ExpectedSLoc ToBridgeKeywordLocOrErr = import(OCE->getBridgeKeywordLoc());
  if (!ToBridgeKeywordLocOrErr)
    return ToBridgeKeywordLocOrErr.takeError();
  return new (Importer.getToContext()) ObjCBridgedCastExpr(
      *ToLParenLocOrErr, OCE->getBridgeKind(), E->getCastKind(),
      *ToBridgeKeywordLocOrErr, ToTypeInfoAsWritten, ToSubExpr);
}
default:
  llvm_unreachable("Cast expression of unsupported type!")__builtin_unreachable();
  return make_error<ImportError>(ImportError::UnsupportedConstruct);
}
7300}

7302ExpectedStmt ASTNodeImporter::VisitOffsetOfExpr(OffsetOfExpr *E) {
SmallVector<OffsetOfNode, 4> ToNodes;
for (int I = 0, N = E->getNumComponents(); I < N; ++I) {
  const OffsetOfNode &FromNode = E->getComponent(I);

  SourceLocation ToBeginLoc, ToEndLoc;

  if (FromNode.getKind() != OffsetOfNode::Base) {
    Error Err = Error::success();
    ToBeginLoc = importChecked(Err, FromNode.getBeginLoc());
    ToEndLoc = importChecked(Err, FromNode.getEndLoc());
    if (Err)
      return std::move(Err);
  }

  switch (FromNode.getKind()) {
  case OffsetOfNode::Array:
    ToNodes.push_back(
        OffsetOfNode(ToBeginLoc, FromNode.getArrayExprIndex(), ToEndLoc));
    break;
  case OffsetOfNode::Base: {
    auto ToBSOrErr = import(FromNode.getBase());
    if (!ToBSOrErr)
      return ToBSOrErr.takeError();
    ToNodes.push_back(OffsetOfNode(*ToBSOrErr));
    break;
  }
  case OffsetOfNode::Field: {
    auto ToFieldOrErr = import(FromNode.getField());
    if (!ToFieldOrErr)
      return ToFieldOrErr.takeError();
    ToNodes.push_back(OffsetOfNode(ToBeginLoc, *ToFieldOrErr, ToEndLoc));
    break;
  }
  case OffsetOfNode::Identifier: {
    IdentifierInfo *ToII = Importer.Import(FromNode.getFieldName());
    ToNodes.push_back(OffsetOfNode(ToBeginLoc, ToII, ToEndLoc));
    break;
  }
  }
}

SmallVector<Expr *, 4> ToExprs(E->getNumExpressions());
for (int I = 0, N = E->getNumExpressions(); I < N; ++I) {
  ExpectedExpr ToIndexExprOrErr = import(E->getIndexExpr(I));
  if (!ToIndexExprOrErr)
    return ToIndexExprOrErr.takeError();
  ToExprs[I] = *ToIndexExprOrErr;
}

Error Err = Error::success();
auto ToType = importChecked(Err, E->getType());
auto ToTypeSourceInfo = importChecked(Err, E->getTypeSourceInfo());
auto ToOperatorLoc = importChecked(Err, E->getOperatorLoc());
auto ToRParenLoc = importChecked(Err, E->getRParenLoc());
if (Err)
  return std::move(Err);

return OffsetOfExpr::Create(
    Importer.getToContext(), ToType, ToOperatorLoc, ToTypeSourceInfo, ToNodes,
    ToExprs, ToRParenLoc);
7363}

7365ExpectedStmt ASTNodeImporter::VisitCXXNoexceptExpr(CXXNoexceptExpr *E) {
Error Err = Error::success();
auto ToType = importChecked(Err, E->getType());
auto ToOperand = importChecked(Err, E->getOperand());
auto ToBeginLoc = importChecked(Err, E->getBeginLoc());
auto ToEndLoc = importChecked(Err, E->getEndLoc());
if (Err)
  return std::move(Err);

CanThrowResult ToCanThrow;
if (E->isValueDependent())
  ToCanThrow = CT_Dependent;
else
  ToCanThrow = E->getValue() ? CT_Can : CT_Cannot;

return new (Importer.getToContext()) CXXNoexceptExpr(
    ToType, ToOperand, ToCanThrow, ToBeginLoc, ToEndLoc);
7382}

7384ExpectedStmt ASTNodeImporter::VisitCXXThrowExpr(CXXThrowExpr *E) {
Error Err = Error::success();
auto ToSubExpr = importChecked(Err, E->getSubExpr());
auto ToType = importChecked(Err, E->getType());
auto ToThrowLoc = importChecked(Err, E->getThrowLoc());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) CXXThrowExpr(
    ToSubExpr, ToType, ToThrowLoc, E->isThrownVariableInScope());
7394}

7396ExpectedStmt ASTNodeImporter::VisitCXXDefaultArgExpr(CXXDefaultArgExpr *E) {
ExpectedSLoc ToUsedLocOrErr = import(E->getUsedLocation());
if (!ToUsedLocOrErr)
  return ToUsedLocOrErr.takeError();

auto ToParamOrErr = import(E->getParam());
if (!ToParamOrErr)
  return ToParamOrErr.takeError();

auto UsedContextOrErr = Importer.ImportContext(E->getUsedContext());
if (!UsedContextOrErr)
  return UsedContextOrErr.takeError();

// Import the default arg if it was not imported yet.
// This is needed because it can happen that during the import of the
// default expression (from VisitParmVarDecl) the same ParmVarDecl is
// encountered here. The default argument for a ParmVarDecl is set in the
// ParmVarDecl only after it is imported (set in VisitParmVarDecl if not here,
// see VisitParmVarDecl).
ParmVarDecl *ToParam = *ToParamOrErr;
if (!ToParam->getDefaultArg()) {
  Optional<ParmVarDecl *> FromParam = Importer.getImportedFromDecl(ToParam);
  assert(FromParam && "ParmVarDecl was not imported?")((void)0);

  if (Error Err = ImportDefaultArgOfParmVarDecl(*FromParam, ToParam))
    return std::move(Err);
}

return CXXDefaultArgExpr::Create(Importer.getToContext(), *ToUsedLocOrErr,
                                 *ToParamOrErr, *UsedContextOrErr);
7426}

7428ExpectedStmt
7429ASTNodeImporter::VisitCXXScalarValueInitExpr(CXXScalarValueInitExpr *E) {
Error Err = Error::success();
auto ToType = importChecked(Err, E->getType());
auto ToTypeSourceInfo = importChecked(Err, E->getTypeSourceInfo());
auto ToRParenLoc = importChecked(Err, E->getRParenLoc());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) CXXScalarValueInitExpr(
    ToType, ToTypeSourceInfo, ToRParenLoc);
7439}

7441ExpectedStmt
7442ASTNodeImporter::VisitCXXBindTemporaryExpr(CXXBindTemporaryExpr *E) {
ExpectedExpr ToSubExprOrErr = import(E->getSubExpr());
if (!ToSubExprOrErr)
  return ToSubExprOrErr.takeError();

auto ToDtorOrErr = import(E->getTemporary()->getDestructor());
if (!ToDtorOrErr)
  return ToDtorOrErr.takeError();

ASTContext &ToCtx = Importer.getToContext();
CXXTemporary *Temp = CXXTemporary::Create(ToCtx, *ToDtorOrErr);
return CXXBindTemporaryExpr::Create(ToCtx, Temp, *ToSubExprOrErr);
7454}

7456ExpectedStmt

7458ASTNodeImporter::VisitCXXTemporaryObjectExpr(CXXTemporaryObjectExpr *E) {
Error Err = Error::success();
auto ToConstructor = importChecked(Err, E->getConstructor());
auto ToType = importChecked(Err, E->getType());
auto ToTypeSourceInfo = importChecked(Err, E->getTypeSourceInfo());
auto ToParenOrBraceRange = importChecked(Err, E->getParenOrBraceRange());
if (Err)
  return std::move(Err);

SmallVector<Expr *, 8> ToArgs(E->getNumArgs());
if (Error Err = ImportContainerChecked(E->arguments(), ToArgs))
  return std::move(Err);

return CXXTemporaryObjectExpr::Create(
    Importer.getToContext(), ToConstructor, ToType, ToTypeSourceInfo, ToArgs,
    ToParenOrBraceRange, E->hadMultipleCandidates(),
    E->isListInitialization(), E->isStdInitListInitialization(),
    E->requiresZeroInitialization());
7476}

7478ExpectedDecl ASTNodeImporter::VisitLifetimeExtendedTemporaryDecl(
  LifetimeExtendedTemporaryDecl *D) {
DeclContext *DC, *LexicalDC;
if (Error Err = ImportDeclContext(D, DC, LexicalDC))
  return std::move(Err);

Error Err = Error::success();
auto Temporary = importChecked(Err, D->getTemporaryExpr());
auto ExtendingDecl = importChecked(Err, D->getExtendingDecl());
if (Err)
  return std::move(Err);
// FIXME: Should ManglingNumber get numbers associated with 'to' context?

LifetimeExtendedTemporaryDecl *To;
if (GetImportedOrCreateDecl(To, D, Temporary, ExtendingDecl,
                            D->getManglingNumber()))
  return To;

To->setLexicalDeclContext(LexicalDC);
LexicalDC->addDeclInternal(To);
return To;
7499}

7501ExpectedStmt
7502ASTNodeImporter::VisitMaterializeTemporaryExpr(MaterializeTemporaryExpr *E) {
Error Err = Error::success();
auto ToType = importChecked(Err, E->getType());
Expr *ToTemporaryExpr = importChecked(
    Err, E->getLifetimeExtendedTemporaryDecl() ? nullptr : E->getSubExpr());
auto ToMaterializedDecl =
    importChecked(Err, E->getLifetimeExtendedTemporaryDecl());
if (Err)
  return std::move(Err);

if (!ToTemporaryExpr)
  ToTemporaryExpr = cast<Expr>(ToMaterializedDecl->getTemporaryExpr());

auto *ToMTE = new (Importer.getToContext()) MaterializeTemporaryExpr(
    ToType, ToTemporaryExpr, E->isBoundToLvalueReference(),
    ToMaterializedDecl);

return ToMTE;
7520}

7522ExpectedStmt ASTNodeImporter::VisitPackExpansionExpr(PackExpansionExpr *E) {
Error Err = Error::success();
auto ToType = importChecked(Err, E->getType());
auto ToPattern = importChecked(Err, E->getPattern());
auto ToEllipsisLoc = importChecked(Err, E->getEllipsisLoc());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) PackExpansionExpr(
    ToType, ToPattern, ToEllipsisLoc, E->getNumExpansions());
7532}

7534ExpectedStmt ASTNodeImporter::VisitSizeOfPackExpr(SizeOfPackExpr *E) {
Error Err = Error::success();
auto ToOperatorLoc = importChecked(Err, E->getOperatorLoc());
auto ToPack = importChecked(Err, E->getPack());
auto ToPackLoc = importChecked(Err, E->getPackLoc());
auto ToRParenLoc = importChecked(Err, E->getRParenLoc());
if (Err)
  return std::move(Err);

Optional<unsigned> Length;
if (!E->isValueDependent())
  Length = E->getPackLength();

SmallVector<TemplateArgument, 8> ToPartialArguments;
if (E->isPartiallySubstituted()) {
  if (Error Err = ImportTemplateArguments(
      E->getPartialArguments().data(),
      E->getPartialArguments().size(),
      ToPartialArguments))
    return std::move(Err);
}

return SizeOfPackExpr::Create(
    Importer.getToContext(), ToOperatorLoc, ToPack, ToPackLoc, ToRParenLoc,
    Length, ToPartialArguments);
7559}


7562ExpectedStmt ASTNodeImporter::VisitCXXNewExpr(CXXNewExpr *E) {
Error Err = Error::success();
auto ToOperatorNew = importChecked(Err, E->getOperatorNew());
auto ToOperatorDelete = importChecked(Err, E->getOperatorDelete());
auto ToTypeIdParens = importChecked(Err, E->getTypeIdParens());
auto ToArraySize = importChecked(Err, E->getArraySize());
auto ToInitializer = importChecked(Err, E->getInitializer());
auto ToType = importChecked(Err, E->getType());
auto ToAllocatedTypeSourceInfo =
    importChecked(Err, E->getAllocatedTypeSourceInfo());
auto ToSourceRange = importChecked(Err, E->getSourceRange());
auto ToDirectInitRange = importChecked(Err, E->getDirectInitRange());
if (Err)
  return std::move(Err);

SmallVector<Expr *, 4> ToPlacementArgs(E->getNumPlacementArgs());
if (Error Err =
    ImportContainerChecked(E->placement_arguments(), ToPlacementArgs))
  return std::move(Err);

return CXXNewExpr::Create(
    Importer.getToContext(), E->isGlobalNew(), ToOperatorNew,
    ToOperatorDelete, E->passAlignment(), E->doesUsualArrayDeleteWantSize(),
    ToPlacementArgs, ToTypeIdParens, ToArraySize, E->getInitializationStyle(),
    ToInitializer, ToType, ToAllocatedTypeSourceInfo, ToSourceRange,
    ToDirectInitRange);
7588}

7590ExpectedStmt ASTNodeImporter::VisitCXXDeleteExpr(CXXDeleteExpr *E) {
Error Err = Error::success();
auto ToType = importChecked(Err, E->getType());
auto ToOperatorDelete = importChecked(Err, E->getOperatorDelete());
auto ToArgument = importChecked(Err, E->getArgument());
auto ToBeginLoc = importChecked(Err, E->getBeginLoc());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) CXXDeleteExpr(
    ToType, E->isGlobalDelete(), E->isArrayForm(), E->isArrayFormAsWritten(),
    E->doesUsualArrayDeleteWantSize(), ToOperatorDelete, ToArgument,
    ToBeginLoc);
7603}

7605ExpectedStmt ASTNodeImporter::VisitCXXConstructExpr(CXXConstructExpr *E) {
Error Err = Error::success();
auto ToType = importChecked(Err, E->getType());
auto ToLocation = importChecked(Err, E->getLocation());
auto ToConstructor = importChecked(Err, E->getConstructor());
auto ToParenOrBraceRange = importChecked(Err, E->getParenOrBraceRange());
if (Err)
  return std::move(Err);

SmallVector<Expr *, 6> ToArgs(E->getNumArgs());
if (Error Err = ImportContainerChecked(E->arguments(), ToArgs))
  return std::move(Err);

return CXXConstructExpr::Create(
    Importer.getToContext(), ToType, ToLocation, ToConstructor,
    E->isElidable(), ToArgs, E->hadMultipleCandidates(),
    E->isListInitialization(), E->isStdInitListInitialization(),
    E->requiresZeroInitialization(), E->getConstructionKind(),
    ToParenOrBraceRange);
7624}

7626ExpectedStmt ASTNodeImporter::VisitExprWithCleanups(ExprWithCleanups *E) {
ExpectedExpr ToSubExprOrErr = import(E->getSubExpr());
if (!ToSubExprOrErr)
  return ToSubExprOrErr.takeError();

SmallVector<ExprWithCleanups::CleanupObject, 8> ToObjects(E->getNumObjects());
if (Error Err = ImportContainerChecked(E->getObjects(), ToObjects))
  return std::move(Err);

return ExprWithCleanups::Create(
    Importer.getToContext(), *ToSubExprOrErr, E->cleanupsHaveSideEffects(),
    ToObjects);
7638}

7640ExpectedStmt ASTNodeImporter::VisitCXXMemberCallExpr(CXXMemberCallExpr *E) {
Error Err = Error::success();
auto ToCallee = importChecked(Err, E->getCallee());
auto ToType = importChecked(Err, E->getType());
auto ToRParenLoc = importChecked(Err, E->getRParenLoc());
if (Err)
  return std::move(Err);

SmallVector<Expr *, 4> ToArgs(E->getNumArgs());
if (Error Err = ImportContainerChecked(E->arguments(), ToArgs))
  return std::move(Err);

return CXXMemberCallExpr::Create(Importer.getToContext(), ToCallee, ToArgs,
                                 ToType, E->getValueKind(), ToRParenLoc,
                                 E->getFPFeatures());
7655}

7657ExpectedStmt ASTNodeImporter::VisitCXXThisExpr(CXXThisExpr *E) {
ExpectedType ToTypeOrErr = import(E->getType());
if (!ToTypeOrErr)
  return ToTypeOrErr.takeError();

ExpectedSLoc ToLocationOrErr = import(E->getLocation());
if (!ToLocationOrErr)
  return ToLocationOrErr.takeError();

return new (Importer.getToContext()) CXXThisExpr(
    *ToLocationOrErr, *ToTypeOrErr, E->isImplicit());
7668}

7670ExpectedStmt ASTNodeImporter::VisitCXXBoolLiteralExpr(CXXBoolLiteralExpr *E) {
ExpectedType ToTypeOrErr = import(E->getType());
if (!ToTypeOrErr)
  return ToTypeOrErr.takeError();

ExpectedSLoc ToLocationOrErr = import(E->getLocation());
if (!ToLocationOrErr)
  return ToLocationOrErr.takeError();

return new (Importer.getToContext()) CXXBoolLiteralExpr(
    E->getValue(), *ToTypeOrErr, *ToLocationOrErr);
7681}

7683ExpectedStmt ASTNodeImporter::VisitMemberExpr(MemberExpr *E) {
Error Err = Error::success();
auto ToBase = importChecked(Err, E->getBase());
auto ToOperatorLoc = importChecked(Err, E->getOperatorLoc());
auto ToQualifierLoc = importChecked(Err, E->getQualifierLoc());
auto ToTemplateKeywordLoc = importChecked(Err, E->getTemplateKeywordLoc());
auto ToMemberDecl = importChecked(Err, E->getMemberDecl());
auto ToType = importChecked(Err, E->getType());
auto ToDecl = importChecked(Err, E->getFoundDecl().getDecl());
auto ToName = importChecked(Err, E->getMemberNameInfo().getName());
auto ToLoc = importChecked(Err, E->getMemberNameInfo().getLoc());
if (Err)
  return std::move(Err);

DeclAccessPair ToFoundDecl =
    DeclAccessPair::make(ToDecl, E->getFoundDecl().getAccess());

DeclarationNameInfo ToMemberNameInfo(ToName, ToLoc);

TemplateArgumentListInfo ToTAInfo, *ResInfo = nullptr;
if (E->hasExplicitTemplateArgs()) {
  if (Error Err =
          ImportTemplateArgumentListInfo(E->getLAngleLoc(), E->getRAngleLoc(),
                                         E->template_arguments(), ToTAInfo))
    return std::move(Err);
  ResInfo = &ToTAInfo;
}

return MemberExpr::Create(Importer.getToContext(), ToBase, E->isArrow(),
                          ToOperatorLoc, ToQualifierLoc, ToTemplateKeywordLoc,
                          ToMemberDecl, ToFoundDecl, ToMemberNameInfo,
                          ResInfo, ToType, E->getValueKind(),
                          E->getObjectKind(), E->isNonOdrUse());
7716}

7718ExpectedStmt
7719ASTNodeImporter::VisitCXXPseudoDestructorExpr(CXXPseudoDestructorExpr *E) {
Error Err = Error::success();
auto ToBase = importChecked(Err, E->getBase());
auto ToOperatorLoc = importChecked(Err, E->getOperatorLoc());
auto ToQualifierLoc = importChecked(Err, E->getQualifierLoc());
auto ToScopeTypeInfo = importChecked(Err, E->getScopeTypeInfo());
auto ToColonColonLoc = importChecked(Err, E->getColonColonLoc());
auto ToTildeLoc = importChecked(Err, E->getTildeLoc());
if (Err)
  return std::move(Err);

PseudoDestructorTypeStorage Storage;
if (IdentifierInfo *FromII = E->getDestroyedTypeIdentifier()) {
  IdentifierInfo *ToII = Importer.Import(FromII);
  ExpectedSLoc ToDestroyedTypeLocOrErr = import(E->getDestroyedTypeLoc());
  if (!ToDestroyedTypeLocOrErr)
    return ToDestroyedTypeLocOrErr.takeError();
  Storage = PseudoDestructorTypeStorage(ToII, *ToDestroyedTypeLocOrErr);
} else {
  if (auto ToTIOrErr = import(E->getDestroyedTypeInfo()))
    Storage = PseudoDestructorTypeStorage(*ToTIOrErr);
  else
    return ToTIOrErr.takeError();
}

return new (Importer.getToContext()) CXXPseudoDestructorExpr(
    Importer.getToContext(), ToBase, E->isArrow(), ToOperatorLoc,
    ToQualifierLoc, ToScopeTypeInfo, ToColonColonLoc, ToTildeLoc, Storage);
7747}

7749ExpectedStmt ASTNodeImporter::VisitCXXDependentScopeMemberExpr(
  CXXDependentScopeMemberExpr *E) {
Error Err = Error::success();
auto ToType = importChecked(Err, E->getType());
auto ToOperatorLoc = importChecked(Err, E->getOperatorLoc());
auto ToQualifierLoc = importChecked(Err, E->getQualifierLoc());
auto ToTemplateKeywordLoc = importChecked(Err, E->getTemplateKeywordLoc());
auto ToFirstQualifierFoundInScope =
    importChecked(Err, E->getFirstQualifierFoundInScope());
if (Err)
  return std::move(Err);

Expr *ToBase = nullptr;
if (!E->isImplicitAccess()) {
  if (ExpectedExpr ToBaseOrErr = import(E->getBase()))
    ToBase = *ToBaseOrErr;
  else
    return ToBaseOrErr.takeError();
}

TemplateArgumentListInfo ToTAInfo, *ResInfo = nullptr;

if (E->hasExplicitTemplateArgs()) {
  if (Error Err =
          ImportTemplateArgumentListInfo(E->getLAngleLoc(), E->getRAngleLoc(),
                                         E->template_arguments(), ToTAInfo))
    return std::move(Err);
  ResInfo = &ToTAInfo;
}
auto ToMember = importChecked(Err, E->getMember());
auto ToMemberLoc = importChecked(Err, E->getMemberLoc());
if (Err)
  return std::move(Err);
DeclarationNameInfo ToMemberNameInfo(ToMember, ToMemberLoc);

// Import additional name location/type info.
if (Error Err =
        ImportDeclarationNameLoc(E->getMemberNameInfo(), ToMemberNameInfo))
  return std::move(Err);

return CXXDependentScopeMemberExpr::Create(
    Importer.getToContext(), ToBase, ToType, E->isArrow(), ToOperatorLoc,
    ToQualifierLoc, ToTemplateKeywordLoc, ToFirstQualifierFoundInScope,
    ToMemberNameInfo, ResInfo);
7793}

7795ExpectedStmt
7796ASTNodeImporter::VisitDependentScopeDeclRefExpr(DependentScopeDeclRefExpr *E) {
Error Err = Error::success();
auto ToQualifierLoc = importChecked(Err, E->getQualifierLoc());
auto ToTemplateKeywordLoc = importChecked(Err, E->getTemplateKeywordLoc());
auto ToDeclName = importChecked(Err, E->getDeclName());
auto ToNameLoc = importChecked(Err, E->getNameInfo().getLoc());
auto ToLAngleLoc = importChecked(Err, E->getLAngleLoc());
auto ToRAngleLoc = importChecked(Err, E->getRAngleLoc());
if (Err)
  return std::move(Err);

DeclarationNameInfo ToNameInfo(ToDeclName, ToNameLoc);
if (Error Err = ImportDeclarationNameLoc(E->getNameInfo(), ToNameInfo))
  return std::move(Err);

TemplateArgumentListInfo ToTAInfo(ToLAngleLoc, ToRAngleLoc);
TemplateArgumentListInfo *ResInfo = nullptr;
if (E->hasExplicitTemplateArgs()) {
  if (Error Err =
      ImportTemplateArgumentListInfo(E->template_arguments(), ToTAInfo))
    return std::move(Err);
  ResInfo = &ToTAInfo;
}

return DependentScopeDeclRefExpr::Create(
    Importer.getToContext(), ToQualifierLoc, ToTemplateKeywordLoc,
    ToNameInfo, ResInfo);
7823}

7825ExpectedStmt ASTNodeImporter::VisitCXXUnresolvedConstructExpr(
  CXXUnresolvedConstructExpr *E) {
Error Err = Error::success();
auto ToLParenLoc = importChecked(Err, E->getLParenLoc());
auto ToRParenLoc = importChecked(Err, E->getRParenLoc());
auto ToType = importChecked(Err, E->getType());
auto ToTypeSourceInfo = importChecked(Err, E->getTypeSourceInfo());
if (Err)
  return std::move(Err);

SmallVector<Expr *, 8> ToArgs(E->getNumArgs());
if (Error Err =
    ImportArrayChecked(E->arg_begin(), E->arg_end(), ToArgs.begin()))
  return std::move(Err);

return CXXUnresolvedConstructExpr::Create(
    Importer.getToContext(), ToType, ToTypeSourceInfo, ToLParenLoc,
    llvm::makeArrayRef(ToArgs), ToRParenLoc);
7843}

7845ExpectedStmt
7846ASTNodeImporter::VisitUnresolvedLookupExpr(UnresolvedLookupExpr *E) {
Expected<CXXRecordDecl *> ToNamingClassOrErr = import(E->getNamingClass());
if (!ToNamingClassOrErr)
  return ToNamingClassOrErr.takeError();

auto ToQualifierLocOrErr = import(E->getQualifierLoc());
if (!ToQualifierLocOrErr)
  return ToQualifierLocOrErr.takeError();

Error Err = Error::success();
auto ToName = importChecked(Err, E->getName());
auto ToNameLoc = importChecked(Err, E->getNameLoc());
if (Err)
  return std::move(Err);
DeclarationNameInfo ToNameInfo(ToName, ToNameLoc);

// Import additional name location/type info.
if (Error Err = ImportDeclarationNameLoc(E->getNameInfo(), ToNameInfo))
  return std::move(Err);

UnresolvedSet<8> ToDecls;
for (auto *D : E->decls())
  if (auto ToDOrErr = import(D))
    ToDecls.addDecl(cast<NamedDecl>(*ToDOrErr));
  else
    return ToDOrErr.takeError();

if (E->hasExplicitTemplateArgs()) {
  TemplateArgumentListInfo ToTAInfo;
  if (Error Err = ImportTemplateArgumentListInfo(
      E->getLAngleLoc(), E->getRAngleLoc(), E->template_arguments(),
      ToTAInfo))
    return std::move(Err);

  ExpectedSLoc ToTemplateKeywordLocOrErr = import(E->getTemplateKeywordLoc());
  if (!ToTemplateKeywordLocOrErr)
    return ToTemplateKeywordLocOrErr.takeError();

  return UnresolvedLookupExpr::Create(
      Importer.getToContext(), *ToNamingClassOrErr, *ToQualifierLocOrErr,
      *ToTemplateKeywordLocOrErr, ToNameInfo, E->requiresADL(), &ToTAInfo,
      ToDecls.begin(), ToDecls.end());
}

return UnresolvedLookupExpr::Create(
    Importer.getToContext(), *ToNamingClassOrErr, *ToQualifierLocOrErr,
    ToNameInfo, E->requiresADL(), E->isOverloaded(), ToDecls.begin(),
    ToDecls.end());
7894}

7896ExpectedStmt
7897ASTNodeImporter::VisitUnresolvedMemberExpr(UnresolvedMemberExpr *E) {
Error Err = Error::success();
auto ToType = importChecked(Err, E->getType());
auto ToOperatorLoc = importChecked(Err, E->getOperatorLoc());
auto ToQualifierLoc = importChecked(Err, E->getQualifierLoc());
auto ToTemplateKeywordLoc = importChecked(Err, E->getTemplateKeywordLoc());
auto ToName = importChecked(Err, E->getName());
auto ToNameLoc = importChecked(Err, E->getNameLoc());
if (Err)
  return std::move(Err);

DeclarationNameInfo ToNameInfo(ToName, ToNameLoc);
// Import additional name location/type info.
if (Error Err = ImportDeclarationNameLoc(E->getNameInfo(), ToNameInfo))
  return std::move(Err);

UnresolvedSet<8> ToDecls;
for (Decl *D : E->decls())
  if (auto ToDOrErr = import(D))
    ToDecls.addDecl(cast<NamedDecl>(*ToDOrErr));
  else
    return ToDOrErr.takeError();

TemplateArgumentListInfo ToTAInfo;
TemplateArgumentListInfo *ResInfo = nullptr;
if (E->hasExplicitTemplateArgs()) {
  TemplateArgumentListInfo FromTAInfo;
  E->copyTemplateArgumentsInto(FromTAInfo);
  if (Error Err = ImportTemplateArgumentListInfo(FromTAInfo, ToTAInfo))
    return std::move(Err);
  ResInfo = &ToTAInfo;
}

Expr *ToBase = nullptr;
if (!E->isImplicitAccess()) {
  if (ExpectedExpr ToBaseOrErr = import(E->getBase()))
    ToBase = *ToBaseOrErr;
  else
    return ToBaseOrErr.takeError();
}

return UnresolvedMemberExpr::Create(
    Importer.getToContext(), E->hasUnresolvedUsing(), ToBase, ToType,
    E->isArrow(), ToOperatorLoc, ToQualifierLoc, ToTemplateKeywordLoc,
    ToNameInfo, ResInfo, ToDecls.begin(), ToDecls.end());
7942}

7944ExpectedStmt ASTNodeImporter::VisitCallExpr(CallExpr *E) {
Error Err = Error::success();
auto ToCallee = importChecked(Err, E->getCallee());
auto ToType = importChecked(Err, E->getType());
auto ToRParenLoc = importChecked(Err, E->getRParenLoc());
if (Err)
  return std::move(Err);

unsigned NumArgs = E->getNumArgs();
llvm::SmallVector<Expr *, 2> ToArgs(NumArgs);
if (Error Err = ImportContainerChecked(E->arguments(), ToArgs))
   return std::move(Err);

if (const auto *OCE = dyn_cast<CXXOperatorCallExpr>(E)) {
  return CXXOperatorCallExpr::Create(
      Importer.getToContext(), OCE->getOperator(), ToCallee, ToArgs, ToType,
      OCE->getValueKind(), ToRParenLoc, OCE->getFPFeatures(),
      OCE->getADLCallKind());
}

return CallExpr::Create(Importer.getToContext(), ToCallee, ToArgs, ToType,
                        E->getValueKind(), ToRParenLoc, E->getFPFeatures(),
                        /*MinNumArgs=*/0, E->getADLCallKind());
7967}

7969ExpectedStmt ASTNodeImporter::VisitLambdaExpr(LambdaExpr *E) {
CXXRecordDecl *FromClass = E->getLambdaClass();
auto ToClassOrErr = import(FromClass);
if (!ToClassOrErr)
  return ToClassOrErr.takeError();
CXXRecordDecl *ToClass = *ToClassOrErr;

auto ToCallOpOrErr = import(E->getCallOperator());
if (!ToCallOpOrErr)
  return ToCallOpOrErr.takeError();

SmallVector<Expr *, 8> ToCaptureInits(E->capture_size());
if (Error Err = ImportContainerChecked(E->capture_inits(), ToCaptureInits))
  return std::move(Err);

Error Err = Error::success();
auto ToIntroducerRange = importChecked(Err, E->getIntroducerRange());
auto ToCaptureDefaultLoc = importChecked(Err, E->getCaptureDefaultLoc());
auto ToEndLoc = importChecked(Err, E->getEndLoc());
if (Err)
  return std::move(Err);

return LambdaExpr::Create(Importer.getToContext(), ToClass, ToIntroducerRange,
                          E->getCaptureDefault(), ToCaptureDefaultLoc,
                          E->hasExplicitParameters(),
                          E->hasExplicitResultType(), ToCaptureInits,
                          ToEndLoc, E->containsUnexpandedParameterPack());
7996}


7999ExpectedStmt ASTNodeImporter::VisitInitListExpr(InitListExpr *E) {
Error Err = Error::success();
auto ToLBraceLoc = importChecked(Err, E->getLBraceLoc());
auto ToRBraceLoc = importChecked(Err, E->getRBraceLoc());
auto ToType = importChecked(Err, E->getType());
if (Err)
  return std::move(Err);

SmallVector<Expr *, 4> ToExprs(E->getNumInits());
if (Error Err = ImportContainerChecked(E->inits(), ToExprs))
  return std::move(Err);

ASTContext &ToCtx = Importer.getToContext();
InitListExpr *To = new (ToCtx) InitListExpr(
    ToCtx, ToLBraceLoc, ToExprs, ToRBraceLoc);
To->setType(ToType);

if (E->hasArrayFiller()) {
  if (ExpectedExpr ToFillerOrErr = import(E->getArrayFiller()))
    To->setArrayFiller(*ToFillerOrErr);
  else
    return ToFillerOrErr.takeError();
}

if (FieldDecl *FromFD = E->getInitializedFieldInUnion()) {
  if (auto ToFDOrErr = import(FromFD))
    To->setInitializedFieldInUnion(*ToFDOrErr);
  else
    return ToFDOrErr.takeError();
}

if (InitListExpr *SyntForm = E->getSyntacticForm()) {
  if (auto ToSyntFormOrErr = import(SyntForm))
    To->setSyntacticForm(*ToSyntFormOrErr);
  else
    return ToSyntFormOrErr.takeError();
}

// Copy InitListExprBitfields, which are not handled in the ctor of
// InitListExpr.
To->sawArrayRangeDesignator(E->hadArrayRangeDesignator());

return To;
8042}

8044ExpectedStmt ASTNodeImporter::VisitCXXStdInitializerListExpr(
  CXXStdInitializerListExpr *E) {
ExpectedType ToTypeOrErr = import(E->getType());
if (!ToTypeOrErr)
  return ToTypeOrErr.takeError();

ExpectedExpr ToSubExprOrErr = import(E->getSubExpr());
if (!ToSubExprOrErr)
  return ToSubExprOrErr.takeError();

return new (Importer.getToContext()) CXXStdInitializerListExpr(
    *ToTypeOrErr, *ToSubExprOrErr);
8056}

8058ExpectedStmt ASTNodeImporter::VisitCXXInheritedCtorInitExpr(
  CXXInheritedCtorInitExpr *E) {
Error Err = Error::success();
auto ToLocation = importChecked(Err, E->getLocation());
auto ToType = importChecked(Err, E->getType());
auto ToConstructor = importChecked(Err, E->getConstructor());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) CXXInheritedCtorInitExpr(
    ToLocation, ToType, ToConstructor, E->constructsVBase(),
    E->inheritedFromVBase());
8070}

8072ExpectedStmt ASTNodeImporter::VisitArrayInitLoopExpr(ArrayInitLoopExpr *E) {
Error Err = Error::success();
auto ToType = importChecked(Err, E->getType());
auto ToCommonExpr = importChecked(Err, E->getCommonExpr());
auto ToSubExpr = importChecked(Err, E->getSubExpr());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) ArrayInitLoopExpr(
    ToType, ToCommonExpr, ToSubExpr);
8082}

8084ExpectedStmt ASTNodeImporter::VisitArrayInitIndexExpr(ArrayInitIndexExpr *E) {
ExpectedType ToTypeOrErr = import(E->getType());
if (!ToTypeOrErr)
  return ToTypeOrErr.takeError();
return new (Importer.getToContext()) ArrayInitIndexExpr(*ToTypeOrErr);
8089}

8091ExpectedStmt ASTNodeImporter::VisitCXXDefaultInitExpr(CXXDefaultInitExpr *E) {
ExpectedSLoc ToBeginLocOrErr = import(E->getBeginLoc());
if (!ToBeginLocOrErr)
  return ToBeginLocOrErr.takeError();

auto ToFieldOrErr = import(E->getField());
if (!ToFieldOrErr)
  return ToFieldOrErr.takeError();

auto UsedContextOrErr = Importer.ImportContext(E->getUsedContext());
if (!UsedContextOrErr)
  return UsedContextOrErr.takeError();

return CXXDefaultInitExpr::Create(
    Importer.getToContext(), *ToBeginLocOrErr, *ToFieldOrErr, *UsedContextOrErr);
8106}

8108ExpectedStmt ASTNodeImporter::VisitCXXNamedCastExpr(CXXNamedCastExpr *E) {
Error Err = Error::success();
auto ToType = importChecked(Err, E->getType());
auto ToSubExpr = importChecked(Err, E->getSubExpr());
auto ToTypeInfoAsWritten = importChecked(Err, E->getTypeInfoAsWritten());
auto ToOperatorLoc = importChecked(Err, E->getOperatorLoc());
auto ToRParenLoc = importChecked(Err, E->getRParenLoc());
auto ToAngleBrackets = importChecked(Err, E->getAngleBrackets());
if (Err)
  return std::move(Err);

ExprValueKind VK = E->getValueKind();
CastKind CK = E->getCastKind();
auto ToBasePathOrErr = ImportCastPath(E);
if (!ToBasePathOrErr)
  return ToBasePathOrErr.takeError();

if (auto CCE = dyn_cast<CXXStaticCastExpr>(E)) {
  return CXXStaticCastExpr::Create(
      Importer.getToContext(), ToType, VK, CK, ToSubExpr, &(*ToBasePathOrErr),
      ToTypeInfoAsWritten, CCE->getFPFeatures(), ToOperatorLoc, ToRParenLoc,
      ToAngleBrackets);
} else if (isa<CXXDynamicCastExpr>(E)) {
  return CXXDynamicCastExpr::Create(
      Importer.getToContext(), ToType, VK, CK, ToSubExpr, &(*ToBasePathOrErr),
      ToTypeInfoAsWritten, ToOperatorLoc, ToRParenLoc, ToAngleBrackets);
} else if (isa<CXXReinterpretCastExpr>(E)) {
  return CXXReinterpretCastExpr::Create(
      Importer.getToContext(), ToType, VK, CK, ToSubExpr, &(*ToBasePathOrErr),
      ToTypeInfoAsWritten, ToOperatorLoc, ToRParenLoc, ToAngleBrackets);
} else if (isa<CXXConstCastExpr>(E)) {
  return CXXConstCastExpr::Create(
      Importer.getToContext(), ToType, VK, ToSubExpr, ToTypeInfoAsWritten,
      ToOperatorLoc, ToRParenLoc, ToAngleBrackets);
} else {
  llvm_unreachable("Unknown cast type")__builtin_unreachable();
  return make_error<ImportError>();
}
8146}

8148ExpectedStmt ASTNodeImporter::VisitSubstNonTypeTemplateParmExpr(
  SubstNonTypeTemplateParmExpr *E) {
Error Err = Error::success();
auto ToType = importChecked(Err, E->getType());
auto ToExprLoc = importChecked(Err, E->getExprLoc());
auto ToParameter = importChecked(Err, E->getParameter());
auto ToReplacement = importChecked(Err, E->getReplacement());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) SubstNonTypeTemplateParmExpr(
    ToType, E->getValueKind(), ToExprLoc, ToParameter,
    E->isReferenceParameter(), ToReplacement);
8161}

8163ExpectedStmt ASTNodeImporter::VisitTypeTraitExpr(TypeTraitExpr *E) {
Error Err = Error::success();
auto ToType = importChecked(Err, E->getType());
auto ToBeginLoc = importChecked(Err, E->getBeginLoc());
auto ToEndLoc = importChecked(Err, E->getEndLoc());
if (Err)
  return std::move(Err);

SmallVector<TypeSourceInfo *, 4> ToArgs(E->getNumArgs());
if (Error Err = ImportContainerChecked(E->getArgs(), ToArgs))
  return std::move(Err);

// According to Sema::BuildTypeTrait(), if E is value-dependent,
// Value is always false.
bool ToValue = (E->isValueDependent() ? false : E->getValue());

return TypeTraitExpr::Create(
    Importer.getToContext(), ToType, ToBeginLoc, E->getTrait(), ToArgs,
    ToEndLoc, ToValue);
8182}

8184ExpectedStmt ASTNodeImporter::VisitCXXTypeidExpr(CXXTypeidExpr *E) {
ExpectedType ToTypeOrErr = import(E->getType());
if (!ToTypeOrErr)
  return ToTypeOrErr.takeError();

auto ToSourceRangeOrErr = import(E->getSourceRange());
if (!ToSourceRangeOrErr)
  return ToSourceRangeOrErr.takeError();

if (E->isTypeOperand()) {
  if (auto ToTSIOrErr = import(E->getTypeOperandSourceInfo()))
    return new (Importer.getToContext()) CXXTypeidExpr(
        *ToTypeOrErr, *ToTSIOrErr, *ToSourceRangeOrErr);
  else
    return ToTSIOrErr.takeError();
}

ExpectedExpr ToExprOperandOrErr = import(E->getExprOperand());
if (!ToExprOperandOrErr)
  return ToExprOperandOrErr.takeError();

return new (Importer.getToContext()) CXXTypeidExpr(
    *ToTypeOrErr, *ToExprOperandOrErr, *ToSourceRangeOrErr);
8207}

8209ExpectedStmt ASTNodeImporter::VisitCXXFoldExpr(CXXFoldExpr *E) {
Error Err = Error::success();

QualType ToType = importChecked(Err, E->getType());
UnresolvedLookupExpr *ToCallee = importChecked(Err, E->getCallee());
SourceLocation ToLParenLoc = importChecked(Err, E->getLParenLoc());
Expr *ToLHS = importChecked(Err, E->getLHS());
SourceLocation ToEllipsisLoc = importChecked(Err, E->getEllipsisLoc());
Expr *ToRHS = importChecked(Err, E->getRHS());
SourceLocation ToRParenLoc = importChecked(Err, E->getRParenLoc());

if (Err)
  return std::move(Err);

return new (Importer.getToContext())
    CXXFoldExpr(ToType, ToCallee, ToLParenLoc, ToLHS, E->getOperator(),
                ToEllipsisLoc, ToRHS, ToRParenLoc, E->getNumExpansions());
8226}

8228Error ASTNodeImporter::ImportOverriddenMethods(CXXMethodDecl *ToMethod,
                                             CXXMethodDecl *FromMethod) {
Error ImportErrors = Error::success();
for (auto *FromOverriddenMethod : FromMethod->overridden_methods()) {
  if (auto ImportedOrErr = import(FromOverriddenMethod))
    ToMethod->getCanonicalDecl()->addOverriddenMethod(cast<CXXMethodDecl>(
        (*ImportedOrErr)->getCanonicalDecl()));
  else
    ImportErrors =
        joinErrors(std::move(ImportErrors), ImportedOrErr.takeError());
}
return ImportErrors;
8240}

8242ASTImporter::ASTImporter(ASTContext &ToContext, FileManager &ToFileManager,
                       ASTContext &FromContext, FileManager &FromFileManager,
                       bool MinimalImport,
                       std::shared_ptr<ASTImporterSharedState> SharedState)
  : SharedState(SharedState), ToContext(ToContext), FromContext(FromContext),
    ToFileManager(ToFileManager), FromFileManager(FromFileManager),
    Minimal(MinimalImport), ODRHandling(ODRHandlingType::Conservative) {

// Create a default state without the lookup table: LLDB case.
if (!SharedState) {
  this->SharedState = std::make_shared<ASTImporterSharedState>();
}

ImportedDecls[FromContext.getTranslationUnitDecl()] =
    ToContext.getTranslationUnitDecl();
8257}

8259ASTImporter::~ASTImporter() = default;

8261Optional<unsigned> ASTImporter::getFieldIndex(Decl *F) {
assert(F && (isa<FieldDecl>(*F) || isa<IndirectFieldDecl>(*F)) &&((void)0)
    "Try to get field index for non-field.")((void)0);

auto *Owner = dyn_cast<RecordDecl>(F->getDeclContext());
if (!Owner)
  return None;

unsigned Index = 0;
for (const auto *D : Owner->decls()) {
  if (D == F)
    return Index;

  if (isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D))
    ++Index;
}

llvm_unreachable("Field was not found in its parent context.")__builtin_unreachable();

return None;
8281}

8283ASTImporter::FoundDeclsTy
8284ASTImporter::findDeclsInToCtx(DeclContext *DC, DeclarationName Name) {
// We search in the redecl context because of transparent contexts.
// E.g. a simple C language enum is a transparent context:
//   enum E { A, B };
// Now if we had a global variable in the TU
//   int A;
// then the enum constant 'A' and the variable 'A' violates ODR.
// We can diagnose this only if we search in the redecl context.
DeclContext *ReDC = DC->getRedeclContext();
if (SharedState->getLookupTable()) {
  ASTImporterLookupTable::LookupResult LookupResult =
      SharedState->getLookupTable()->lookup(ReDC, Name);
  return FoundDeclsTy(LookupResult.begin(), LookupResult.end());
} else {
  DeclContext::lookup_result NoloadLookupResult = ReDC->noload_lookup(Name);
  FoundDeclsTy Result(NoloadLookupResult.begin(), NoloadLookupResult.end());
  // We must search by the slow case of localUncachedLookup because that is
  // working even if there is no LookupPtr for the DC. We could use
  // DC::buildLookup() to create the LookupPtr, but that would load external
  // decls again, we must avoid that case.
  // Also, even if we had the LookupPtr, we must find Decls which are not
  // in the LookupPtr, so we need the slow case.
  // These cases are handled in ASTImporterLookupTable, but we cannot use
  // that with LLDB since that traverses through the AST which initiates the
  // load of external decls again via DC::decls().  And again, we must avoid
  // loading external decls during the import.
  if (Result.empty())
    ReDC->localUncachedLookup(Name, Result);
  return Result;
}
8314}

8316void ASTImporter::AddToLookupTable(Decl *ToD) {
SharedState->addDeclToLookup(ToD);
8318}

8320Expected<Decl *> ASTImporter::ImportImpl(Decl *FromD) {
// Import the decl using ASTNodeImporter.
ASTNodeImporter Importer(*this);
return Importer.Visit(FromD);
8
←
Calling 'Base::Visit'→
8324}

8326void ASTImporter::RegisterImportedDecl(Decl *FromD, Decl *ToD) {
MapImported(FromD, ToD);
8328}

8330llvm::Expected<ExprWithCleanups::CleanupObject>
8331ASTImporter::Import(ExprWithCleanups::CleanupObject From) {
if (auto *CLE = From.dyn_cast<CompoundLiteralExpr *>()) {
  if (Expected<Expr *> R = Import(CLE))
    return ExprWithCleanups::CleanupObject(cast<CompoundLiteralExpr>(*R));
}

// FIXME: Handle BlockDecl when we implement importing BlockExpr in
//        ASTNodeImporter.
return make_error<ImportError>(ImportError::UnsupportedConstruct);
8340}

8342Expected<const Type *> ASTImporter::Import(const Type *FromT) {
if (!FromT)
  return FromT;

// Check whether we've already imported this type.
llvm::DenseMap<const Type *, const Type *>::iterator Pos =
    ImportedTypes.find(FromT);
if (Pos != ImportedTypes.end())
  return Pos->second;

// Import the type
ASTNodeImporter Importer(*this);
ExpectedType ToTOrErr = Importer.Visit(FromT);
if (!ToTOrErr)
  return ToTOrErr.takeError();

// Record the imported type.
ImportedTypes[FromT] = ToTOrErr->getTypePtr();

return ToTOrErr->getTypePtr();
8362}

8364Expected<QualType> ASTImporter::Import(QualType FromT) {
if (FromT.isNull())
  return QualType{};

Expected<const Type *> ToTyOrErr = Import(FromT.getTypePtr());
if (!ToTyOrErr)
  return ToTyOrErr.takeError();

return ToContext.getQualifiedType(*ToTyOrErr, FromT.getLocalQualifiers());
8373}

8375Expected<TypeSourceInfo *> ASTImporter::Import(TypeSourceInfo *FromTSI) {
if (!FromTSI)
  return FromTSI;

// FIXME: For now we just create a "trivial" type source info based
// on the type and a single location. Implement a real version of this.
ExpectedType TOrErr = Import(FromTSI->getType());
if (!TOrErr)
  return TOrErr.takeError();
ExpectedSLoc BeginLocOrErr = Import(FromTSI->getTypeLoc().getBeginLoc());
if (!BeginLocOrErr)
  return BeginLocOrErr.takeError();

return ToContext.getTrivialTypeSourceInfo(*TOrErr, *BeginLocOrErr);
8389}

8391Expected<Attr *> ASTImporter::Import(const Attr *FromAttr) {
Attr *ToAttr = nullptr;
SourceRange ToRange;
if (Error Err = importInto(ToRange, FromAttr->getRange()))
  return std::move(Err);

// FIXME: Is there some kind of AttrVisitor to use here?
switch (FromAttr->getKind()) {
case attr::Aligned: {
  auto *From = cast<AlignedAttr>(FromAttr);
  AlignedAttr *To;
  auto CreateAlign = [&](bool IsAlignmentExpr, void *Alignment) {
    return AlignedAttr::Create(ToContext, IsAlignmentExpr, Alignment, ToRange,
                               From->getSyntax(),
                               From->getSemanticSpelling());
  };
  if (From->isAlignmentExpr()) {
    if (auto ToEOrErr = Import(From->getAlignmentExpr()))
      To = CreateAlign(true, *ToEOrErr);
    else
      return ToEOrErr.takeError();
  } else {
    if (auto ToTOrErr = Import(From->getAlignmentType()))
      To = CreateAlign(false, *ToTOrErr);
    else
      return ToTOrErr.takeError();
  }
  To->setInherited(From->isInherited());
  To->setPackExpansion(From->isPackExpansion());
  To->setImplicit(From->isImplicit());
  ToAttr = To;
  break;
}
case attr::Format: {
  const auto *From = cast<FormatAttr>(FromAttr);
  FormatAttr *To;
  IdentifierInfo *ToAttrType = Import(From->getType());
  To = FormatAttr::Create(ToContext, ToAttrType, From->getFormatIdx(),
                          From->getFirstArg(), ToRange, From->getSyntax());
  To->setInherited(From->isInherited());
  ToAttr = To;
  break;
}
default:
  // FIXME: 'clone' copies every member but some of them should be imported.
  // Handle other Attrs that have parameters that should be imported.
  ToAttr = FromAttr->clone(ToContext);
  ToAttr->setRange(ToRange);
  break;
}
assert(ToAttr && "Attribute should be created.")((void)0);

return ToAttr;
8444}

8446Decl *ASTImporter::GetAlreadyImportedOrNull(const Decl *FromD) const {
auto Pos = ImportedDecls.find(FromD);
if (Pos != ImportedDecls.end())
  return Pos->second;
else
  return nullptr;
8452}

8454TranslationUnitDecl *ASTImporter::GetFromTU(Decl *ToD) {
auto FromDPos = ImportedFromDecls.find(ToD);
if (FromDPos == ImportedFromDecls.end())
  return nullptr;
return FromDPos->second->getTranslationUnitDecl();
8459}

8461Expected<Decl *> ASTImporter::Import(Decl *FromD) {
if (!FromD)
2
←
Assuming 'FromD' is non-null→
3
←
Taking false branch→
  return nullptr;

// Push FromD to the stack, and remove that when we return.
ImportPath.push(FromD);
auto ImportPathBuilder =
    llvm::make_scope_exit([this]() { ImportPath.pop(); });

// Check whether there was a previous failed import.
// If yes return the existing error.
if (auto Error = getImportDeclErrorIfAny(FromD))
4
←
Taking false branch→
  return make_error<ImportError>(*Error);

// Check whether we've already imported this declaration.
Decl *ToD = GetAlreadyImportedOrNull(FromD);
if (ToD) {
5
←
Assuming 'ToD' is null→
6
←
Taking false branch→
  // Already imported (possibly from another TU) and with an error.
  if (auto Error = SharedState->getImportDeclErrorIfAny(ToD)) {
    setImportDeclError(FromD, *Error);
    return make_error<ImportError>(*Error);
  }

  // If FromD has some updated flags after last import, apply it.
  updateFlags(FromD, ToD);
  // If we encounter a cycle during an import then we save the relevant part
  // of the import path associated to the Decl.
  if (ImportPath.hasCycleAtBack())
    SavedImportPaths[FromD].push_back(ImportPath.copyCycleAtBack());
  return ToD;
}

// Import the declaration.
ExpectedDecl ToDOrErr = ImportImpl(FromD);
7
←
Calling 'ASTImporter::ImportImpl'→
if (!ToDOrErr) {
  // Failed to import.

  auto Pos = ImportedDecls.find(FromD);
  if (Pos != ImportedDecls.end()) {
    // Import failed after the object was created.
    // Remove all references to it.
    auto *ToD = Pos->second;
    ImportedDecls.erase(Pos);

    // ImportedDecls and ImportedFromDecls are not symmetric.  It may happen
    // (e.g. with namespaces) that several decls from the 'from' context are
    // mapped to the same decl in the 'to' context.  If we removed entries
    // from the LookupTable here then we may end up removing them multiple
    // times.

    // The Lookuptable contains decls only which are in the 'to' context.
    // Remove from the Lookuptable only if it is *imported* into the 'to'
    // context (and do not remove it if it was added during the initial
    // traverse of the 'to' context).
    auto PosF = ImportedFromDecls.find(ToD);
    if (PosF != ImportedFromDecls.end()) {
      // In the case of TypedefNameDecl we create the Decl first and only
      // then we import and set its DeclContext. So, the DC might not be set
      // when we reach here.
      if (ToD->getDeclContext())
        SharedState->removeDeclFromLookup(ToD);
      ImportedFromDecls.erase(PosF);
    }

    // FIXME: AST may contain remaining references to the failed object.
    // However, the ImportDeclErrors in the shared state contains all the
    // failed objects together with their error.
  }

  // Error encountered for the first time.
  // After takeError the error is not usable any more in ToDOrErr.
  // Get a copy of the error object (any more simple solution for this?).
  ImportError ErrOut;
  handleAllErrors(ToDOrErr.takeError(),
                  [&ErrOut](const ImportError &E) { ErrOut = E; });
  setImportDeclError(FromD, ErrOut);
  // Set the error for the mapped to Decl, which is in the "to" context.
  if (Pos != ImportedDecls.end())
    SharedState->setImportDeclError(Pos->second, ErrOut);

  // Set the error for all nodes which have been created before we
  // recognized the error.
  for (const auto &Path : SavedImportPaths[FromD])
    for (Decl *FromDi : Path) {
      setImportDeclError(FromDi, ErrOut);
      //FIXME Should we remove these Decls from ImportedDecls?
      // Set the error for the mapped to Decl, which is in the "to" context.
      auto Ii = ImportedDecls.find(FromDi);
      if (Ii != ImportedDecls.end())
        SharedState->setImportDeclError(Ii->second, ErrOut);
        // FIXME Should we remove these Decls from the LookupTable,
        // and from ImportedFromDecls?
    }
  SavedImportPaths.erase(FromD);

  // Do not return ToDOrErr, error was taken out of it.
  return make_error<ImportError>(ErrOut);
}

ToD = *ToDOrErr;

// FIXME: Handle the "already imported with error" case. We can get here
// nullptr only if GetImportedOrCreateDecl returned nullptr (after a
// previously failed create was requested).
// Later GetImportedOrCreateDecl can be updated to return the error.
if (!ToD) {
  auto Err = getImportDeclErrorIfAny(FromD);
  assert(Err)((void)0);
  return make_error<ImportError>(*Err);
}

// We could import from the current TU without error.  But previously we
// already had imported a Decl as `ToD` from another TU (with another
// ASTImporter object) and with an error.
if (auto Error = SharedState->getImportDeclErrorIfAny(ToD)) {
  setImportDeclError(FromD, *Error);
  return make_error<ImportError>(*Error);
}

// Make sure that ImportImpl registered the imported decl.
assert(ImportedDecls.count(FromD) != 0 && "Missing call to MapImported?")((void)0);

if (FromD->hasAttrs())
  for (const Attr *FromAttr : FromD->getAttrs()) {
    auto ToAttrOrErr = Import(FromAttr);
    if (ToAttrOrErr)
      ToD->addAttr(*ToAttrOrErr);
    else
      return ToAttrOrErr.takeError();
  }

// Notify subclasses.
Imported(FromD, ToD);

updateFlags(FromD, ToD);
SavedImportPaths.erase(FromD);
return ToDOrErr;
8598}

8600Expected<DeclContext *> ASTImporter::ImportContext(DeclContext *FromDC) {
if (!FromDC)
  return FromDC;

ExpectedDecl ToDCOrErr = Import(cast<Decl>(FromDC));
if (!ToDCOrErr)
  return ToDCOrErr.takeError();
auto *ToDC = cast<DeclContext>(*ToDCOrErr);

// When we're using a record/enum/Objective-C class/protocol as a context, we
// need it to have a definition.
if (auto *ToRecord = dyn_cast<RecordDecl>(ToDC)) {
  auto *FromRecord = cast<RecordDecl>(FromDC);
  if (ToRecord->isCompleteDefinition())
    return ToDC;

  // If FromRecord is not defined we need to force it to be.
  // Simply calling CompleteDecl(...) for a RecordDecl will break some cases
  // it will start the definition but we never finish it.
  // If there are base classes they won't be imported and we will
  // be missing anything that we inherit from those bases.
  if (FromRecord->getASTContext().getExternalSource() &&
      !FromRecord->isCompleteDefinition())
    FromRecord->getASTContext().getExternalSource()->CompleteType(FromRecord);

  if (FromRecord->isCompleteDefinition())
    if (Error Err = ASTNodeImporter(*this).ImportDefinition(
        FromRecord, ToRecord, ASTNodeImporter::IDK_Basic))
      return std::move(Err);
} else if (auto *ToEnum = dyn_cast<EnumDecl>(ToDC)) {
  auto *FromEnum = cast<EnumDecl>(FromDC);
  if (ToEnum->isCompleteDefinition()) {
    // Do nothing.
  } else if (FromEnum->isCompleteDefinition()) {
    if (Error Err = ASTNodeImporter(*this).ImportDefinition(
        FromEnum, ToEnum, ASTNodeImporter::IDK_Basic))
      return std::move(Err);
  } else {
    CompleteDecl(ToEnum);
  }
} else if (auto *ToClass = dyn_cast<ObjCInterfaceDecl>(ToDC)) {
  auto *FromClass = cast<ObjCInterfaceDecl>(FromDC);
  if (ToClass->getDefinition()) {
    // Do nothing.
  } else if (ObjCInterfaceDecl *FromDef = FromClass->getDefinition()) {
    if (Error Err = ASTNodeImporter(*this).ImportDefinition(
        FromDef, ToClass, ASTNodeImporter::IDK_Basic))
      return std::move(Err);
  } else {
    CompleteDecl(ToClass);
  }
} else if (auto *ToProto = dyn_cast<ObjCProtocolDecl>(ToDC)) {
  auto *FromProto = cast<ObjCProtocolDecl>(FromDC);
  if (ToProto->getDefinition()) {
    // Do nothing.
  } else if (ObjCProtocolDecl *FromDef = FromProto->getDefinition()) {
    if (Error Err = ASTNodeImporter(*this).ImportDefinition(
        FromDef, ToProto, ASTNodeImporter::IDK_Basic))
      return std::move(Err);
  } else {
    CompleteDecl(ToProto);
  }
}

return ToDC;
8665}

8667Expected<Expr *> ASTImporter::Import(Expr *FromE) {
if (ExpectedStmt ToSOrErr = Import(cast_or_null<Stmt>(FromE)))
  return cast_or_null<Expr>(*ToSOrErr);
else
  return ToSOrErr.takeError();
8672}

8674Expected<Stmt *> ASTImporter::Import(Stmt *FromS) {
if (!FromS)
  return nullptr;

// Check whether we've already imported this statement.
llvm::DenseMap<Stmt *, Stmt *>::iterator Pos = ImportedStmts.find(FromS);
if (Pos != ImportedStmts.end())
  return Pos->second;

// Import the statement.
ASTNodeImporter Importer(*this);
ExpectedStmt ToSOrErr = Importer.Visit(FromS);
if (!ToSOrErr)
  return ToSOrErr;

if (auto *ToE = dyn_cast<Expr>(*ToSOrErr)) {
  auto *FromE = cast<Expr>(FromS);
  // Copy ExprBitfields, which may not be handled in Expr subclasses
  // constructors.
  ToE->setValueKind(FromE->getValueKind());
  ToE->setObjectKind(FromE->getObjectKind());
  ToE->setDependence(FromE->getDependence());
}

// Record the imported statement object.
ImportedStmts[FromS] = *ToSOrErr;
return ToSOrErr;
8701}

8703Expected<NestedNameSpecifier *>
8704ASTImporter::Import(NestedNameSpecifier *FromNNS) {
if (!FromNNS)
  return nullptr;

NestedNameSpecifier *Prefix = nullptr;
if (Error Err = importInto(Prefix, FromNNS->getPrefix()))
  return std::move(Err);

switch (FromNNS->getKind()) {
case NestedNameSpecifier::Identifier:
  assert(FromNNS->getAsIdentifier() && "NNS should contain identifier.")((void)0);
  return NestedNameSpecifier::Create(ToContext, Prefix,
                                     Import(FromNNS->getAsIdentifier()));

case NestedNameSpecifier::Namespace:
  if (ExpectedDecl NSOrErr = Import(FromNNS->getAsNamespace())) {
    return NestedNameSpecifier::Create(ToContext, Prefix,
                                       cast<NamespaceDecl>(*NSOrErr));
  } else
    return NSOrErr.takeError();

case NestedNameSpecifier::NamespaceAlias:
  if (ExpectedDecl NSADOrErr = Import(FromNNS->getAsNamespaceAlias()))
    return NestedNameSpecifier::Create(ToContext, Prefix,
                                       cast<NamespaceAliasDecl>(*NSADOrErr));
  else
    return NSADOrErr.takeError();

case NestedNameSpecifier::Global:
  return NestedNameSpecifier::GlobalSpecifier(ToContext);

case NestedNameSpecifier::Super:
  if (ExpectedDecl RDOrErr = Import(FromNNS->getAsRecordDecl()))
    return NestedNameSpecifier::SuperSpecifier(ToContext,
                                               cast<CXXRecordDecl>(*RDOrErr));
  else
    return RDOrErr.takeError();

case NestedNameSpecifier::TypeSpec:
case NestedNameSpecifier::TypeSpecWithTemplate:
  if (Expected<QualType> TyOrErr =
          Import(QualType(FromNNS->getAsType(), 0u))) {
    bool TSTemplate =
        FromNNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate;
    return NestedNameSpecifier::Create(ToContext, Prefix, TSTemplate,
                                       TyOrErr->getTypePtr());
  } else {
    return TyOrErr.takeError();
  }
}

llvm_unreachable("Invalid nested name specifier kind")__builtin_unreachable();
8756}

8758Expected<NestedNameSpecifierLoc>
8759ASTImporter::Import(NestedNameSpecifierLoc FromNNS) {
// Copied from NestedNameSpecifier mostly.
SmallVector<NestedNameSpecifierLoc , 8> NestedNames;
NestedNameSpecifierLoc NNS = FromNNS;

// Push each of the nested-name-specifiers's onto a stack for
// serialization in reverse order.
while (NNS) {
  NestedNames.push_back(NNS);
  NNS = NNS.getPrefix();
}

NestedNameSpecifierLocBuilder Builder;

while (!NestedNames.empty()) {
  NNS = NestedNames.pop_back_val();
  NestedNameSpecifier *Spec = nullptr;
  if (Error Err = importInto(Spec, NNS.getNestedNameSpecifier()))
    return std::move(Err);

  NestedNameSpecifier::SpecifierKind Kind = Spec->getKind();

  SourceLocation ToLocalBeginLoc, ToLocalEndLoc;
  if (Kind != NestedNameSpecifier::Super) {
    if (Error Err = importInto(ToLocalBeginLoc, NNS.getLocalBeginLoc()))
      return std::move(Err);

    if (Kind != NestedNameSpecifier::Global)
      if (Error Err = importInto(ToLocalEndLoc, NNS.getLocalEndLoc()))
        return std::move(Err);
  }

  switch (Kind) {
  case NestedNameSpecifier::Identifier:
    Builder.Extend(getToContext(), Spec->getAsIdentifier(), ToLocalBeginLoc,
                   ToLocalEndLoc);
    break;

  case NestedNameSpecifier::Namespace:
    Builder.Extend(getToContext(), Spec->getAsNamespace(), ToLocalBeginLoc,
                   ToLocalEndLoc);
    break;

  case NestedNameSpecifier::NamespaceAlias:
    Builder.Extend(getToContext(), Spec->getAsNamespaceAlias(),
                   ToLocalBeginLoc, ToLocalEndLoc);
    break;

  case NestedNameSpecifier::TypeSpec:
  case NestedNameSpecifier::TypeSpecWithTemplate: {
    SourceLocation ToTLoc;
    if (Error Err = importInto(ToTLoc, NNS.getTypeLoc().getBeginLoc()))
      return std::move(Err);
    TypeSourceInfo *TSI = getToContext().getTrivialTypeSourceInfo(
          QualType(Spec->getAsType(), 0), ToTLoc);
    if (Kind == NestedNameSpecifier::TypeSpecWithTemplate)
      // ToLocalBeginLoc is here the location of the 'template' keyword.
      Builder.Extend(getToContext(), ToLocalBeginLoc, TSI->getTypeLoc(),
                     ToLocalEndLoc);
    else
      // No location for 'template' keyword here.
      Builder.Extend(getToContext(), SourceLocation{}, TSI->getTypeLoc(),
                     ToLocalEndLoc);
    break;
  }

  case NestedNameSpecifier::Global:
    Builder.MakeGlobal(getToContext(), ToLocalBeginLoc);
    break;

  case NestedNameSpecifier::Super: {
    auto ToSourceRangeOrErr = Import(NNS.getSourceRange());
    if (!ToSourceRangeOrErr)
      return ToSourceRangeOrErr.takeError();

    Builder.MakeSuper(getToContext(), Spec->getAsRecordDecl(),
                      ToSourceRangeOrErr->getBegin(),
                      ToSourceRangeOrErr->getEnd());
  }
}
}

return Builder.getWithLocInContext(getToContext());
8842}

8844Expected<TemplateName> ASTImporter::Import(TemplateName From) {
switch (From.getKind()) {
case TemplateName::Template:
  if (ExpectedDecl ToTemplateOrErr = Import(From.getAsTemplateDecl()))
    return TemplateName(cast<TemplateDecl>(*ToTemplateOrErr));
  else
    return ToTemplateOrErr.takeError();

case TemplateName::OverloadedTemplate: {
  OverloadedTemplateStorage *FromStorage = From.getAsOverloadedTemplate();
  UnresolvedSet<2> ToTemplates;
  for (auto *I : *FromStorage) {
    if (auto ToOrErr = Import(I))
      ToTemplates.addDecl(cast<NamedDecl>(*ToOrErr));
    else
      return ToOrErr.takeError();
  }
  return ToContext.getOverloadedTemplateName(ToTemplates.begin(),
                                             ToTemplates.end());
}

case TemplateName::AssumedTemplate: {
  AssumedTemplateStorage *FromStorage = From.getAsAssumedTemplateName();
  auto DeclNameOrErr = Import(FromStorage->getDeclName());
  if (!DeclNameOrErr)
    return DeclNameOrErr.takeError();
  return ToContext.getAssumedTemplateName(*DeclNameOrErr);
}

case TemplateName::QualifiedTemplate: {
  QualifiedTemplateName *QTN = From.getAsQualifiedTemplateName();
  auto QualifierOrErr = Import(QTN->getQualifier());
  if (!QualifierOrErr)
    return QualifierOrErr.takeError();

  if (ExpectedDecl ToTemplateOrErr = Import(From.getAsTemplateDecl()))
    return ToContext.getQualifiedTemplateName(
        *QualifierOrErr, QTN->hasTemplateKeyword(),
        cast<TemplateDecl>(*ToTemplateOrErr));
  else
    return ToTemplateOrErr.takeError();
}

case TemplateName::DependentTemplate: {
  DependentTemplateName *DTN = From.getAsDependentTemplateName();
  auto QualifierOrErr = Import(DTN->getQualifier());
  if (!QualifierOrErr)
    return QualifierOrErr.takeError();

  if (DTN->isIdentifier()) {
    return ToContext.getDependentTemplateName(*QualifierOrErr,
                                              Import(DTN->getIdentifier()));
  }

  return ToContext.getDependentTemplateName(*QualifierOrErr,
                                            DTN->getOperator());
}

case TemplateName::SubstTemplateTemplateParm: {
  SubstTemplateTemplateParmStorage *Subst =
      From.getAsSubstTemplateTemplateParm();
  ExpectedDecl ParamOrErr = Import(Subst->getParameter());
  if (!ParamOrErr)
    return ParamOrErr.takeError();

  auto ReplacementOrErr = Import(Subst->getReplacement());
  if (!ReplacementOrErr)
    return ReplacementOrErr.takeError();

  return ToContext.getSubstTemplateTemplateParm(
      cast<TemplateTemplateParmDecl>(*ParamOrErr), *ReplacementOrErr);
}

case TemplateName::SubstTemplateTemplateParmPack: {
  SubstTemplateTemplateParmPackStorage *SubstPack
    = From.getAsSubstTemplateTemplateParmPack();
  ExpectedDecl ParamOrErr = Import(SubstPack->getParameterPack());
  if (!ParamOrErr)
    return ParamOrErr.takeError();

  ASTNodeImporter Importer(*this);
  auto ArgPackOrErr =
      Importer.ImportTemplateArgument(SubstPack->getArgumentPack());
  if (!ArgPackOrErr)
    return ArgPackOrErr.takeError();

  return ToContext.getSubstTemplateTemplateParmPack(
      cast<TemplateTemplateParmDecl>(*ParamOrErr), *ArgPackOrErr);
}
}

llvm_unreachable("Invalid template name kind")__builtin_unreachable();
8936}

8938Expected<SourceLocation> ASTImporter::Import(SourceLocation FromLoc) {
if (FromLoc.isInvalid())
  return SourceLocation{};

SourceManager &FromSM = FromContext.getSourceManager();
bool IsBuiltin = FromSM.isWrittenInBuiltinFile(FromLoc);

std::pair<FileID, unsigned> Decomposed = FromSM.getDecomposedLoc(FromLoc);
Expected<FileID> ToFileIDOrErr = Import(Decomposed.first, IsBuiltin);
if (!ToFileIDOrErr)
  return ToFileIDOrErr.takeError();
SourceManager &ToSM = ToContext.getSourceManager();
return ToSM.getComposedLoc(*ToFileIDOrErr, Decomposed.second);
8951}

8953Expected<SourceRange> ASTImporter::Import(SourceRange FromRange) {
SourceLocation ToBegin, ToEnd;
if (Error Err = importInto(ToBegin, FromRange.getBegin()))
  return std::move(Err);
if (Error Err = importInto(ToEnd, FromRange.getEnd()))
  return std::move(Err);

return SourceRange(ToBegin, ToEnd);
8961}

8963Expected<FileID> ASTImporter::Import(FileID FromID, bool IsBuiltin) {
llvm::DenseMap<FileID, FileID>::iterator Pos = ImportedFileIDs.find(FromID);
if (Pos != ImportedFileIDs.end())
  return Pos->second;

SourceManager &FromSM = FromContext.getSourceManager();
SourceManager &ToSM = ToContext.getSourceManager();
const SrcMgr::SLocEntry &FromSLoc = FromSM.getSLocEntry(FromID);

// Map the FromID to the "to" source manager.
FileID ToID;
if (FromSLoc.isExpansion()) {
  const SrcMgr::ExpansionInfo &FromEx = FromSLoc.getExpansion();
  ExpectedSLoc ToSpLoc = Import(FromEx.getSpellingLoc());
  if (!ToSpLoc)
    return ToSpLoc.takeError();
  ExpectedSLoc ToExLocS = Import(FromEx.getExpansionLocStart());
  if (!ToExLocS)
    return ToExLocS.takeError();
  unsigned TokenLen = FromSM.getFileIDSize(FromID);
  SourceLocation MLoc;
  if (FromEx.isMacroArgExpansion()) {
    MLoc = ToSM.createMacroArgExpansionLoc(*ToSpLoc, *ToExLocS, TokenLen);
  } else {
    if (ExpectedSLoc ToExLocE = Import(FromEx.getExpansionLocEnd()))
      MLoc = ToSM.createExpansionLoc(*ToSpLoc, *ToExLocS, *ToExLocE, TokenLen,
                                     FromEx.isExpansionTokenRange());
    else
      return ToExLocE.takeError();
  }
  ToID = ToSM.getFileID(MLoc);
} else {
  const SrcMgr::ContentCache *Cache = &FromSLoc.getFile().getContentCache();

  if (!IsBuiltin && !Cache->BufferOverridden) {
    // Include location of this file.
    ExpectedSLoc ToIncludeLoc = Import(FromSLoc.getFile().getIncludeLoc());
    if (!ToIncludeLoc)
      return ToIncludeLoc.takeError();

    // Every FileID that is not the main FileID needs to have a valid include
    // location so that the include chain points to the main FileID. When
    // importing the main FileID (which has no include location), we need to
    // create a fake include location in the main file to keep this property
    // intact.
    SourceLocation ToIncludeLocOrFakeLoc = *ToIncludeLoc;
    if (FromID == FromSM.getMainFileID())
      ToIncludeLocOrFakeLoc = ToSM.getLocForStartOfFile(ToSM.getMainFileID());

    if (Cache->OrigEntry && Cache->OrigEntry->getDir()) {
      // FIXME: We probably want to use getVirtualFile(), so we don't hit the
      // disk again
      // FIXME: We definitely want to re-use the existing MemoryBuffer, rather
      // than mmap the files several times.
      auto Entry =
          ToFileManager.getOptionalFileRef(Cache->OrigEntry->getName());
      // FIXME: The filename may be a virtual name that does probably not
      // point to a valid file and we get no Entry here. In this case try with
      // the memory buffer below.
      if (Entry)
        ToID = ToSM.createFileID(*Entry, ToIncludeLocOrFakeLoc,
                                 FromSLoc.getFile().getFileCharacteristic());
    }
  }

  if (ToID.isInvalid() || IsBuiltin) {
    // FIXME: We want to re-use the existing MemoryBuffer!
    llvm::Optional<llvm::MemoryBufferRef> FromBuf =
        Cache->getBufferOrNone(FromContext.getDiagnostics(),
                               FromSM.getFileManager(), SourceLocation{});
    if (!FromBuf)
      return llvm::make_error<ImportError>(ImportError::Unknown);

    std::unique_ptr<llvm::MemoryBuffer> ToBuf =
        llvm::MemoryBuffer::getMemBufferCopy(FromBuf->getBuffer(),
                                             FromBuf->getBufferIdentifier());
    ToID = ToSM.createFileID(std::move(ToBuf),
                             FromSLoc.getFile().getFileCharacteristic());
  }
}

assert(ToID.isValid() && "Unexpected invalid fileID was created.")((void)0);

ImportedFileIDs[FromID] = ToID;
return ToID;
9048}

9050Expected<CXXCtorInitializer *> ASTImporter::Import(CXXCtorInitializer *From) {
ExpectedExpr ToExprOrErr = Import(From->getInit());
if (!ToExprOrErr)
  return ToExprOrErr.takeError();

auto LParenLocOrErr = Import(From->getLParenLoc());
if (!LParenLocOrErr)
  return LParenLocOrErr.takeError();

auto RParenLocOrErr = Import(From->getRParenLoc());
if (!RParenLocOrErr)
  return RParenLocOrErr.takeError();

if (From->isBaseInitializer()) {
  auto ToTInfoOrErr = Import(From->getTypeSourceInfo());
  if (!ToTInfoOrErr)
    return ToTInfoOrErr.takeError();

  SourceLocation EllipsisLoc;
  if (From->isPackExpansion())
    if (Error Err = importInto(EllipsisLoc, From->getEllipsisLoc()))
      return std::move(Err);

  return new (ToContext) CXXCtorInitializer(
      ToContext, *ToTInfoOrErr, From->isBaseVirtual(), *LParenLocOrErr,
      *ToExprOrErr, *RParenLocOrErr, EllipsisLoc);
} else if (From->isMemberInitializer()) {
  ExpectedDecl ToFieldOrErr = Import(From->getMember());
  if (!ToFieldOrErr)
    return ToFieldOrErr.takeError();

  auto MemberLocOrErr = Import(From->getMemberLocation());
  if (!MemberLocOrErr)
    return MemberLocOrErr.takeError();

  return new (ToContext) CXXCtorInitializer(
      ToContext, cast_or_null<FieldDecl>(*ToFieldOrErr), *MemberLocOrErr,
      *LParenLocOrErr, *ToExprOrErr, *RParenLocOrErr);
} else if (From->isIndirectMemberInitializer()) {
  ExpectedDecl ToIFieldOrErr = Import(From->getIndirectMember());
  if (!ToIFieldOrErr)
    return ToIFieldOrErr.takeError();

  auto MemberLocOrErr = Import(From->getMemberLocation());
  if (!MemberLocOrErr)
    return MemberLocOrErr.takeError();

  return new (ToContext) CXXCtorInitializer(
      ToContext, cast_or_null<IndirectFieldDecl>(*ToIFieldOrErr),
      *MemberLocOrErr, *LParenLocOrErr, *ToExprOrErr, *RParenLocOrErr);
} else if (From->isDelegatingInitializer()) {
  auto ToTInfoOrErr = Import(From->getTypeSourceInfo());
  if (!ToTInfoOrErr)
    return ToTInfoOrErr.takeError();

  return new (ToContext)
      CXXCtorInitializer(ToContext, *ToTInfoOrErr, *LParenLocOrErr,
                         *ToExprOrErr, *RParenLocOrErr);
} else {
  // FIXME: assert?
  return make_error<ImportError>();
}
9112}

9114Expected<CXXBaseSpecifier *>
9115ASTImporter::Import(const CXXBaseSpecifier *BaseSpec) {
auto Pos = ImportedCXXBaseSpecifiers.find(BaseSpec);
if (Pos != ImportedCXXBaseSpecifiers.end())
  return Pos->second;

Expected<SourceRange> ToSourceRange = Import(BaseSpec->getSourceRange());
if (!ToSourceRange)
  return ToSourceRange.takeError();
Expected<TypeSourceInfo *> ToTSI = Import(BaseSpec->getTypeSourceInfo());
if (!ToTSI)
  return ToTSI.takeError();
ExpectedSLoc ToEllipsisLoc = Import(BaseSpec->getEllipsisLoc());
if (!ToEllipsisLoc)
  return ToEllipsisLoc.takeError();
CXXBaseSpecifier *Imported = new (ToContext) CXXBaseSpecifier(
    *ToSourceRange, BaseSpec->isVirtual(), BaseSpec->isBaseOfClass(),
    BaseSpec->getAccessSpecifierAsWritten(), *ToTSI, *ToEllipsisLoc);
ImportedCXXBaseSpecifiers[BaseSpec] = Imported;
return Imported;
9134}

9136llvm::Expected<APValue> ASTImporter::Import(const APValue &FromValue) {
ASTNodeImporter Importer(*this);
return Importer.ImportAPValue(FromValue);
9139}

9141Error ASTImporter::ImportDefinition(Decl *From) {
ExpectedDecl ToOrErr = Import(From);
if (!ToOrErr)
  return ToOrErr.takeError();
Decl *To = *ToOrErr;

auto *FromDC = cast<DeclContext>(From);
ASTNodeImporter Importer(*this);

if (auto *ToRecord = dyn_cast<RecordDecl>(To)) {
  if (!ToRecord->getDefinition()) {
    return Importer.ImportDefinition(
        cast<RecordDecl>(FromDC), ToRecord,
        ASTNodeImporter::IDK_Everything);
  }
}

if (auto *ToEnum = dyn_cast<EnumDecl>(To)) {
  if (!ToEnum->getDefinition()) {
    return Importer.ImportDefinition(
        cast<EnumDecl>(FromDC), ToEnum, ASTNodeImporter::IDK_Everything);
  }
}

if (auto *ToIFace = dyn_cast<ObjCInterfaceDecl>(To)) {
  if (!ToIFace->getDefinition()) {
    return Importer.ImportDefinition(
        cast<ObjCInterfaceDecl>(FromDC), ToIFace,
        ASTNodeImporter::IDK_Everything);
  }
}

if (auto *ToProto = dyn_cast<ObjCProtocolDecl>(To)) {
  if (!ToProto->getDefinition()) {
    return Importer.ImportDefinition(
        cast<ObjCProtocolDecl>(FromDC), ToProto,
        ASTNodeImporter::IDK_Everything);
  }
}

return Importer.ImportDeclContext(FromDC, true);
9182}

9184Expected<DeclarationName> ASTImporter::Import(DeclarationName FromName) {
if (!FromName)
  return DeclarationName{};

switch (FromName.getNameKind()) {
case DeclarationName::Identifier:
  return DeclarationName(Import(FromName.getAsIdentifierInfo()));

case DeclarationName::ObjCZeroArgSelector:
case DeclarationName::ObjCOneArgSelector:
case DeclarationName::ObjCMultiArgSelector:
  if (auto ToSelOrErr = Import(FromName.getObjCSelector()))
    return DeclarationName(*ToSelOrErr);
  else
    return ToSelOrErr.takeError();

case DeclarationName::CXXConstructorName: {
  if (auto ToTyOrErr = Import(FromName.getCXXNameType()))
    return ToContext.DeclarationNames.getCXXConstructorName(
        ToContext.getCanonicalType(*ToTyOrErr));
  else
    return ToTyOrErr.takeError();
}

case DeclarationName::CXXDestructorName: {
  if (auto ToTyOrErr = Import(FromName.getCXXNameType()))
    return ToContext.DeclarationNames.getCXXDestructorName(
        ToContext.getCanonicalType(*ToTyOrErr));
  else
    return ToTyOrErr.takeError();
}

case DeclarationName::CXXDeductionGuideName: {
  if (auto ToTemplateOrErr = Import(FromName.getCXXDeductionGuideTemplate()))
    return ToContext.DeclarationNames.getCXXDeductionGuideName(
        cast<TemplateDecl>(*ToTemplateOrErr));
  else
    return ToTemplateOrErr.takeError();
}

case DeclarationName::CXXConversionFunctionName: {
  if (auto ToTyOrErr = Import(FromName.getCXXNameType()))
    return ToContext.DeclarationNames.getCXXConversionFunctionName(
        ToContext.getCanonicalType(*ToTyOrErr));
  else
    return ToTyOrErr.takeError();
}

case DeclarationName::CXXOperatorName:
  return ToContext.DeclarationNames.getCXXOperatorName(
                                        FromName.getCXXOverloadedOperator());

case DeclarationName::CXXLiteralOperatorName:
  return ToContext.DeclarationNames.getCXXLiteralOperatorName(
      Import(FromName.getCXXLiteralIdentifier()));

case DeclarationName::CXXUsingDirective:
  // FIXME: STATICS!
  return DeclarationName::getUsingDirectiveName();
}

llvm_unreachable("Invalid DeclarationName Kind!")__builtin_unreachable();
9246}

9248IdentifierInfo *ASTImporter::Import(const IdentifierInfo *FromId) {
if (!FromId)
  return nullptr;

IdentifierInfo *ToId = &ToContext.Idents.get(FromId->getName());

if (!ToId->getBuiltinID() && FromId->getBuiltinID())
  ToId->setBuiltinID(FromId->getBuiltinID());

return ToId;
9258}

9260Expected<Selector> ASTImporter::Import(Selector FromSel) {
if (FromSel.isNull())
  return Selector{};

SmallVector<IdentifierInfo *, 4> Idents;
Idents.push_back(Import(FromSel.getIdentifierInfoForSlot(0)));
for (unsigned I = 1, N = FromSel.getNumArgs(); I < N; ++I)
  Idents.push_back(Import(FromSel.getIdentifierInfoForSlot(I)));
return ToContext.Selectors.getSelector(FromSel.getNumArgs(), Idents.data());
9269}

9271llvm::Expected<APValue>
9272ASTNodeImporter::ImportAPValue(const APValue &FromValue) {
APValue Result;
llvm::Error Err = llvm::Error::success();
auto ImportLoop = [&](const APValue *From, APValue *To, unsigned Size) {
  for (unsigned Idx = 0; Idx < Size; Idx++) {
    APValue Tmp = importChecked(Err, From[Idx]);
    To[Idx] = Tmp;
  }
};
switch (FromValue.getKind()) {
case APValue::None:
case APValue::Indeterminate:
case APValue::Int:
case APValue::Float:
case APValue::FixedPoint:
case APValue::ComplexInt:
case APValue::ComplexFloat:
  Result = FromValue;
  break;
case APValue::Vector: {
  Result.MakeVector();
  MutableArrayRef<APValue> Elts =
      Result.setVectorUninit(FromValue.getVectorLength());
  ImportLoop(((const APValue::Vec *)(const char *)&FromValue.Data)->Elts,
             Elts.data(), FromValue.getVectorLength());
  break;
}
case APValue::Array:
  Result.MakeArray(FromValue.getArrayInitializedElts(),
                   FromValue.getArraySize());
  ImportLoop(((const APValue::Arr *)(const char *)&FromValue.Data)->Elts,
             ((const APValue::Arr *)(const char *)&Result.Data)->Elts,
             FromValue.getArrayInitializedElts());
  break;
case APValue::Struct:
  Result.MakeStruct(FromValue.getStructNumBases(),
                    FromValue.getStructNumFields());
  ImportLoop(
      ((const APValue::StructData *)(const char *)&FromValue.Data)->Elts,
      ((const APValue::StructData *)(const char *)&Result.Data)->Elts,
      FromValue.getStructNumBases() + FromValue.getStructNumFields());
  break;
case APValue::Union: {
  Result.MakeUnion();
  const Decl *ImpFDecl = importChecked(Err, FromValue.getUnionField());
  APValue ImpValue = importChecked(Err, FromValue.getUnionValue());
  if (Err)
    return std::move(Err);
  Result.setUnion(cast<FieldDecl>(ImpFDecl), ImpValue);
  break;
}
case APValue::AddrLabelDiff: {
  Result.MakeAddrLabelDiff();
  const Expr *ImpLHS = importChecked(Err, FromValue.getAddrLabelDiffLHS());
  const Expr *ImpRHS = importChecked(Err, FromValue.getAddrLabelDiffRHS());
  if (Err)
    return std::move(Err);
  Result.setAddrLabelDiff(cast<AddrLabelExpr>(ImpLHS),
                          cast<AddrLabelExpr>(ImpRHS));
  break;
}
case APValue::MemberPointer: {
  const Decl *ImpMemPtrDecl =
      importChecked(Err, FromValue.getMemberPointerDecl());
  if (Err)
    return std::move(Err);
  MutableArrayRef<const CXXRecordDecl *> ToPath =
      Result.setMemberPointerUninit(
          cast<const ValueDecl>(ImpMemPtrDecl),
          FromValue.isMemberPointerToDerivedMember(),
          FromValue.getMemberPointerPath().size());
  llvm::ArrayRef<const CXXRecordDecl *> FromPath =
      Result.getMemberPointerPath();
  for (unsigned Idx = 0; Idx < FromValue.getMemberPointerPath().size();
       Idx++) {
    const Decl *ImpDecl = importChecked(Err, FromPath[Idx]);
    if (Err)
      return std::move(Err);
    ToPath[Idx] = cast<const CXXRecordDecl>(ImpDecl->getCanonicalDecl());
  }
  break;
}
case APValue::LValue:
  APValue::LValueBase Base;
  QualType FromElemTy;
  if (FromValue.getLValueBase()) {
    assert(!FromValue.getLValueBase().is<DynamicAllocLValue>() &&((void)0)
           "in C++20 dynamic allocation are transient so they shouldn't "((void)0)
           "appear in the AST")((void)0);
    if (!FromValue.getLValueBase().is<TypeInfoLValue>()) {
      if (const auto *E =
              FromValue.getLValueBase().dyn_cast<const Expr *>()) {
        FromElemTy = E->getType();
        const Expr *ImpExpr = importChecked(Err, E);
        if (Err)
          return std::move(Err);
        Base = APValue::LValueBase(ImpExpr,
                                   FromValue.getLValueBase().getCallIndex(),
                                   FromValue.getLValueBase().getVersion());
      } else {
        FromElemTy =
            FromValue.getLValueBase().get<const ValueDecl *>()->getType();
        const Decl *ImpDecl = importChecked(
            Err, FromValue.getLValueBase().get<const ValueDecl *>());
        if (Err)
          return std::move(Err);
        Base = APValue::LValueBase(cast<ValueDecl>(ImpDecl),
                                   FromValue.getLValueBase().getCallIndex(),
                                   FromValue.getLValueBase().getVersion());
      }
    } else {
      FromElemTy = FromValue.getLValueBase().getTypeInfoType();
      QualType ImpTypeInfo = importChecked(
          Err,
          QualType(FromValue.getLValueBase().get<TypeInfoLValue>().getType(),
                   0));
      QualType ImpType =
          importChecked(Err, FromValue.getLValueBase().getTypeInfoType());
      if (Err)
        return std::move(Err);
      Base = APValue::LValueBase::getTypeInfo(
          TypeInfoLValue(ImpTypeInfo.getTypePtr()), ImpType);
    }
  }
  CharUnits Offset = FromValue.getLValueOffset();
  unsigned PathLength = FromValue.getLValuePath().size();
  Result.MakeLValue();
  if (FromValue.hasLValuePath()) {
    MutableArrayRef<APValue::LValuePathEntry> ToPath = Result.setLValueUninit(
        Base, Offset, PathLength, FromValue.isLValueOnePastTheEnd(),
        FromValue.isNullPointer());
    llvm::ArrayRef<APValue::LValuePathEntry> FromPath =
        FromValue.getLValuePath();
    for (unsigned LoopIdx = 0; LoopIdx < PathLength; LoopIdx++) {
      if (FromElemTy->isRecordType()) {
        const Decl *FromDecl =
            FromPath[LoopIdx].getAsBaseOrMember().getPointer();
        const Decl *ImpDecl = importChecked(Err, FromDecl);
        if (Err)
          return std::move(Err);
        if (auto *RD = dyn_cast<CXXRecordDecl>(FromDecl))
          FromElemTy = Importer.FromContext.getRecordType(RD);
        else
          FromElemTy = cast<ValueDecl>(FromDecl)->getType();
        ToPath[LoopIdx] = APValue::LValuePathEntry(APValue::BaseOrMemberType(
            ImpDecl, FromPath[LoopIdx].getAsBaseOrMember().getInt()));
      } else {
        FromElemTy =
            Importer.FromContext.getAsArrayType(FromElemTy)->getElementType();
        ToPath[LoopIdx] = APValue::LValuePathEntry::ArrayIndex(
            FromPath[LoopIdx].getAsArrayIndex());
      }
    }
  } else
    Result.setLValue(Base, Offset, APValue::NoLValuePath{},
                     FromValue.isNullPointer());
}
if (Err)
  return std::move(Err);
return Result;
9432}

9434Expected<DeclarationName> ASTImporter::HandleNameConflict(DeclarationName Name,
                                                        DeclContext *DC,
                                                        unsigned IDNS,
                                                        NamedDecl **Decls,
                                                        unsigned NumDecls) {
if (ODRHandling == ODRHandlingType::Conservative)
  // Report error at any name conflict.
  return make_error<ImportError>(ImportError::NameConflict);
else
  // Allow to create the new Decl with the same name.
  return Name;
9445}

9447DiagnosticBuilder ASTImporter::ToDiag(SourceLocation Loc, unsigned DiagID) {
if (LastDiagFromFrom)
  ToContext.getDiagnostics().notePriorDiagnosticFrom(
    FromContext.getDiagnostics());
LastDiagFromFrom = false;
return ToContext.getDiagnostics().Report(Loc, DiagID);
9453}

9455DiagnosticBuilder ASTImporter::FromDiag(SourceLocation Loc, unsigned DiagID) {
if (!LastDiagFromFrom)
  FromContext.getDiagnostics().notePriorDiagnosticFrom(
    ToContext.getDiagnostics());
LastDiagFromFrom = true;
return FromContext.getDiagnostics().Report(Loc, DiagID);
9461}

9463void ASTImporter::CompleteDecl (Decl *D) {
if (auto *ID = dyn_cast<ObjCInterfaceDecl>(D)) {
  if (!ID->getDefinition())
    ID->startDefinition();
}
else if (auto *PD = dyn_cast<ObjCProtocolDecl>(D)) {
  if (!PD->getDefinition())
    PD->startDefinition();
}
else if (auto *TD = dyn_cast<TagDecl>(D)) {
  if (!TD->getDefinition() && !TD->isBeingDefined()) {
    TD->startDefinition();
    TD->setCompleteDefinition(true);
  }
}
else {
  assert(0 && "CompleteDecl called on a Decl that can't be completed")((void)0);
}
9481}

9483Decl *ASTImporter::MapImported(Decl *From, Decl *To) {
llvm::DenseMap<Decl *, Decl *>::iterator Pos = ImportedDecls.find(From);
assert((Pos == ImportedDecls.end() || Pos->second == To) &&((void)0)
    "Try to import an already imported Decl")((void)0);
if (Pos != ImportedDecls.end())
  return Pos->second;
ImportedDecls[From] = To;
// This mapping should be maintained only in this function. Therefore do not
// check for additional consistency.
ImportedFromDecls[To] = From;
// In the case of TypedefNameDecl we create the Decl first and only then we
// import and set its DeclContext. So, the DC is still not set when we reach
// here from GetImportedOrCreateDecl.
if (To->getDeclContext())
  AddToLookupTable(To);
return To;
9499}

9501llvm::Optional<ImportError>
9502ASTImporter::getImportDeclErrorIfAny(Decl *FromD) const {
auto Pos = ImportDeclErrors.find(FromD);
if (Pos != ImportDeclErrors.end())
  return Pos->second;
else
  return Optional<ImportError>();
9508}

9510void ASTImporter::setImportDeclError(Decl *From, ImportError Error) {
auto InsertRes = ImportDeclErrors.insert({From, Error});
(void)InsertRes;
// Either we set the error for the first time, or we already had set one and
// now we want to set the same error.
assert(InsertRes.second || InsertRes.first->second.Error == Error.Error)((void)0);
9516}

9518bool ASTImporter::IsStructurallyEquivalent(QualType From, QualType To,
                                         bool Complain) {
llvm::DenseMap<const Type *, const Type *>::iterator Pos =
    ImportedTypes.find(From.getTypePtr());
if (Pos != ImportedTypes.end()) {
  if (ExpectedType ToFromOrErr = Import(From)) {
    if (ToContext.hasSameType(*ToFromOrErr, To))
      return true;
  } else {
    llvm::consumeError(ToFromOrErr.takeError());
  }
}

StructuralEquivalenceContext Ctx(FromContext, ToContext, NonEquivalentDecls,
                                 getStructuralEquivalenceKind(*this), false,
                                 Complain);
return Ctx.IsEquivalent(From, To);
9535}

←

/usr/src/gnu/usr.bin/clang/libclangAST/../../../llvm/clang/include/clang/AST/DeclVisitor.h

→

1//===- DeclVisitor.h - Visitor for Decl subclasses --------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9//  This file defines the DeclVisitor interface.
10//
11//===----------------------------------------------------------------------===//
12 
13#ifndef LLVM_CLANG_AST_DECLVISITOR_H
14#define LLVM_CLANG_AST_DECLVISITOR_H
15 
16#include "clang/AST/Decl.h"
17#include "clang/AST/DeclBase.h"
18#include "clang/AST/DeclCXX.h"
19#include "clang/AST/DeclFriend.h"
20#include "clang/AST/DeclObjC.h"
21#include "clang/AST/DeclOpenMP.h"
22#include "clang/AST/DeclTemplate.h"
23#include "llvm/ADT/STLExtras.h"
24#include "llvm/Support/ErrorHandling.h"
25 
26namespace clang {
27 
28namespace declvisitor {
29/// A simple visitor class that helps create declaration visitors.
30template<template <typename> class Ptr, typename ImplClass, typename RetTy=void>
31class Base {
32public:
33#define PTR(CLASS) typename Ptr<CLASS>::type
34#define DISPATCH(NAME, CLASS) \
35  return static_cast<ImplClass*>(this)->Visit##NAME(static_cast<PTR(CLASS)>(D))
36 
37  RetTy Visit(PTR(Decl) D) {
38    switch (D->getKind()) {
9
←
Control jumps to 'case ObjCCategory:'  at line 153→
39#define DECL(DERIVED, BASE) \
40      case Decl::DERIVED: DISPATCH(DERIVED##Decl, DERIVED##Decl);
41#define ABSTRACT_DECL(DECL)
42#include "clang/AST/DeclNodes.inc"
43    }
44    llvm_unreachable("Decl that isn't part of DeclNodes.inc!")__builtin_unreachable();
45  }
46 
47  // If the implementation chooses not to implement a certain visit
48  // method, fall back to the parent.
49#define DECL(DERIVED, BASE) \
50  RetTy Visit##DERIVED##Decl(PTR(DERIVED##Decl) D) { DISPATCH(BASE, BASE); }
51#include "clang/AST/DeclNodes.inc"
52 
53  RetTy VisitDecl(PTR(Decl) D) { return RetTy(); }
54 
55#undef PTR
56#undef DISPATCH
57};
58 
59} // namespace declvisitor
60 
61/// A simple visitor class that helps create declaration visitors.
62///
63/// This class does not preserve constness of Decl pointers (see also
64/// ConstDeclVisitor).
65template <typename ImplClass, typename RetTy = void>
66class DeclVisitor
67    : public declvisitor::Base<std::add_pointer, ImplClass, RetTy> {};
68 
69/// A simple visitor class that helps create declaration visitors.
70///
71/// This class preserves constness of Decl pointers (see also DeclVisitor).
72template <typename ImplClass, typename RetTy = void>
73class ConstDeclVisitor
74    : public declvisitor::Base<llvm::make_const_ptr, ImplClass, RetTy> {};
75 
76} // namespace clang
77 
78#endif // LLVM_CLANG_AST_DECLVISITOR_H

←

/usr/src/gnu/usr.bin/clang/libclangAST/obj/../include/clang/AST/DeclNodes.inc

→

1/*===- TableGen'erated file -------------------------------------*- C++ -*-===*\
2|*                                                                            *|
3|* List of AST nodes of a particular kind                                     *|
4|*                                                                            *|
5|* Automatically generated file, do not edit!                                 *|
6|*                                                                            *|
7\*===----------------------------------------------------------------------===*/
8 
9#ifndef ABSTRACT_DECL
10#  define ABSTRACT_DECL(Type) Type
11#endif
12#ifndef DECL_RANGE
13#  define DECL_RANGE(Base, First, Last)
14#endif
15 
16#ifndef LAST_DECL_RANGE
17#  define LAST_DECL_RANGE(Base, First, Last) DECL_RANGE(Base, First, Last)
18#endif
19 
20#ifndef ACCESSSPEC
21#  define ACCESSSPEC(Type, Base) DECL(Type, Base)
22#endif
23ACCESSSPEC(AccessSpec, Decl)
24#undef ACCESSSPEC
25 
26#ifndef BLOCK
27#  define BLOCK(Type, Base) DECL(Type, Base)
28#endif
29BLOCK(Block, Decl)
30#undef BLOCK
31 
32#ifndef CAPTURED
33#  define CAPTURED(Type, Base) DECL(Type, Base)
34#endif
35CAPTURED(Captured, Decl)
36#undef CAPTURED
37 
38#ifndef CLASSSCOPEFUNCTIONSPECIALIZATION
39#  define CLASSSCOPEFUNCTIONSPECIALIZATION(Type, Base) DECL(Type, Base)
40#endif
41CLASSSCOPEFUNCTIONSPECIALIZATION(ClassScopeFunctionSpecialization, Decl)
42#undef CLASSSCOPEFUNCTIONSPECIALIZATION
43 
44#ifndef EMPTY
45#  define EMPTY(Type, Base) DECL(Type, Base)
46#endif
47EMPTY(Empty, Decl)
48#undef EMPTY
49 
50#ifndef EXPORT
51#  define EXPORT(Type, Base) DECL(Type, Base)
52#endif
53EXPORT(Export, Decl)
54#undef EXPORT
55 
56#ifndef EXTERNCCONTEXT
57#  define EXTERNCCONTEXT(Type, Base) DECL(Type, Base)
58#endif
59EXTERNCCONTEXT(ExternCContext, Decl)
60#undef EXTERNCCONTEXT
61 
62#ifndef FILESCOPEASM
63#  define FILESCOPEASM(Type, Base) DECL(Type, Base)
64#endif
65FILESCOPEASM(FileScopeAsm, Decl)
66#undef FILESCOPEASM
67 
68#ifndef FRIEND
69#  define FRIEND(Type, Base) DECL(Type, Base)
70#endif
71FRIEND(Friend, Decl)
72#undef FRIEND
73 
74#ifndef FRIENDTEMPLATE
75#  define FRIENDTEMPLATE(Type, Base) DECL(Type, Base)
76#endif
77FRIENDTEMPLATE(FriendTemplate, Decl)
78#undef FRIENDTEMPLATE
79 
80#ifndef IMPORT
81#  define IMPORT(Type, Base) DECL(Type, Base)
82#endif
83IMPORT(Import, Decl)
84#undef IMPORT
85 
86#ifndef LIFETIMEEXTENDEDTEMPORARY
87#  define LIFETIMEEXTENDEDTEMPORARY(Type, Base) DECL(Type, Base)
88#endif
89LIFETIMEEXTENDEDTEMPORARY(LifetimeExtendedTemporary, Decl)
90#undef LIFETIMEEXTENDEDTEMPORARY
91 
92#ifndef LINKAGESPEC
93#  define LINKAGESPEC(Type, Base) DECL(Type, Base)
94#endif
95LINKAGESPEC(LinkageSpec, Decl)
96#undef LINKAGESPEC
97 
98#ifndef NAMED
99#  define NAMED(Type, Base) DECL(Type, Base)
100#endif
101ABSTRACT_DECL(NAMED(Named, Decl))
102#ifndef BASEUSING
103#  define BASEUSING(Type, Base) NAMED(Type, Base)
104#endif
105ABSTRACT_DECL(BASEUSING(BaseUsing, NamedDecl))
106#ifndef USING
107#  define USING(Type, Base) BASEUSING(Type, Base)
108#endif
109USING(Using, BaseUsingDecl)
110#undef USING
111 
112#ifndef USINGENUM
113#  define USINGENUM(Type, Base) BASEUSING(Type, Base)
114#endif
115USINGENUM(UsingEnum, BaseUsingDecl)
116#undef USINGENUM
117 
118DECL_RANGE(BaseUsing, Using, UsingEnum)
119 
120#undef BASEUSING
121 
122#ifndef LABEL
123#  define LABEL(Type, Base) NAMED(Type, Base)
124#endif
125LABEL(Label, NamedDecl)
126#undef LABEL
127 
128#ifndef NAMESPACE
129#  define NAMESPACE(Type, Base) NAMED(Type, Base)
130#endif
131NAMESPACE(Namespace, NamedDecl)
132#undef NAMESPACE
133 
134#ifndef NAMESPACEALIAS
135#  define NAMESPACEALIAS(Type, Base) NAMED(Type, Base)
136#endif
137NAMESPACEALIAS(NamespaceAlias, NamedDecl)
138#undef NAMESPACEALIAS
139 
140#ifndef OBJCCOMPATIBLEALIAS
141#  define OBJCCOMPATIBLEALIAS(Type, Base) NAMED(Type, Base)
142#endif
143OBJCCOMPATIBLEALIAS(ObjCCompatibleAlias, NamedDecl)
144#undef OBJCCOMPATIBLEALIAS
145 
146#ifndef OBJCCONTAINER
147#  define OBJCCONTAINER(Type, Base) NAMED(Type, Base)
148#endif
149ABSTRACT_DECL(OBJCCONTAINER(ObjCContainer, NamedDecl))
150#ifndef OBJCCATEGORY
151#  define OBJCCATEGORY(Type, Base) OBJCCONTAINER(Type, Base)
152#endif
153OBJCCATEGORY(ObjCCategory, ObjCContainerDecl)
10
←
Calling 'ASTNodeImporter::VisitObjCCategoryDecl'→
154#undef OBJCCATEGORY
155 
156#ifndef OBJCIMPL
157#  define OBJCIMPL(Type, Base) OBJCCONTAINER(Type, Base)
158#endif
159ABSTRACT_DECL(OBJCIMPL(ObjCImpl, ObjCContainerDecl))
160#ifndef OBJCCATEGORYIMPL
161#  define OBJCCATEGORYIMPL(Type, Base) OBJCIMPL(Type, Base)
162#endif
163OBJCCATEGORYIMPL(ObjCCategoryImpl, ObjCImplDecl)
164#undef OBJCCATEGORYIMPL
165 
166#ifndef OBJCIMPLEMENTATION
167#  define OBJCIMPLEMENTATION(Type, Base) OBJCIMPL(Type, Base)
168#endif
169OBJCIMPLEMENTATION(ObjCImplementation, ObjCImplDecl)
170#undef OBJCIMPLEMENTATION
171 
172DECL_RANGE(ObjCImpl, ObjCCategoryImpl, ObjCImplementation)
173 
174#undef OBJCIMPL
175 
176#ifndef OBJCINTERFACE
177#  define OBJCINTERFACE(Type, Base) OBJCCONTAINER(Type, Base)
178#endif
179OBJCINTERFACE(ObjCInterface, ObjCContainerDecl)
180#undef OBJCINTERFACE
181 
182#ifndef OBJCPROTOCOL
183#  define OBJCPROTOCOL(Type, Base) OBJCCONTAINER(Type, Base)
184#endif
185OBJCPROTOCOL(ObjCProtocol, ObjCContainerDecl)
186#undef OBJCPROTOCOL
187 
188DECL_RANGE(ObjCContainer, ObjCCategory, ObjCProtocol)
189 
190#undef OBJCCONTAINER
191 
192#ifndef OBJCMETHOD
193#  define OBJCMETHOD(Type, Base) NAMED(Type, Base)
194#endif
195OBJCMETHOD(ObjCMethod, NamedDecl)
196#undef OBJCMETHOD
197 
198#ifndef OBJCPROPERTY
199#  define OBJCPROPERTY(Type, Base) NAMED(Type, Base)
200#endif
201OBJCPROPERTY(ObjCProperty, NamedDecl)
202#undef OBJCPROPERTY
203 
204#ifndef TEMPLATE
205#  define TEMPLATE(Type, Base) NAMED(Type, Base)
206#endif
207ABSTRACT_DECL(TEMPLATE(Template, NamedDecl))
208#ifndef BUILTINTEMPLATE
209#  define BUILTINTEMPLATE(Type, Base) TEMPLATE(Type, Base)
210#endif
211BUILTINTEMPLATE(BuiltinTemplate, TemplateDecl)
212#undef BUILTINTEMPLATE
213 
214#ifndef CONCEPT
215#  define CONCEPT(Type, Base) TEMPLATE(Type, Base)
216#endif
217CONCEPT(Concept, TemplateDecl)
218#undef CONCEPT
219 
220#ifndef REDECLARABLETEMPLATE
221#  define REDECLARABLETEMPLATE(Type, Base) TEMPLATE(Type, Base)
222#endif
223ABSTRACT_DECL(REDECLARABLETEMPLATE(RedeclarableTemplate, TemplateDecl))
224#ifndef CLASSTEMPLATE
225#  define CLASSTEMPLATE(Type, Base) REDECLARABLETEMPLATE(Type, Base)
226#endif
227CLASSTEMPLATE(ClassTemplate, RedeclarableTemplateDecl)
228#undef CLASSTEMPLATE
229 
230#ifndef FUNCTIONTEMPLATE
231#  define FUNCTIONTEMPLATE(Type, Base) REDECLARABLETEMPLATE(Type, Base)
232#endif
233FUNCTIONTEMPLATE(FunctionTemplate, RedeclarableTemplateDecl)
234#undef FUNCTIONTEMPLATE
235 
236#ifndef TYPEALIASTEMPLATE
237#  define TYPEALIASTEMPLATE(Type, Base) REDECLARABLETEMPLATE(Type, Base)
238#endif
239TYPEALIASTEMPLATE(TypeAliasTemplate, RedeclarableTemplateDecl)
240#undef TYPEALIASTEMPLATE
241 
242#ifndef VARTEMPLATE
243#  define VARTEMPLATE(Type, Base) REDECLARABLETEMPLATE(Type, Base)
244#endif
245VARTEMPLATE(VarTemplate, RedeclarableTemplateDecl)
246#undef VARTEMPLATE
247 
248DECL_RANGE(RedeclarableTemplate, ClassTemplate, VarTemplate)
249 
250#undef REDECLARABLETEMPLATE
251 
252#ifndef TEMPLATETEMPLATEPARM
253#  define TEMPLATETEMPLATEPARM(Type, Base) TEMPLATE(Type, Base)
254#endif
255TEMPLATETEMPLATEPARM(TemplateTemplateParm, TemplateDecl)
256#undef TEMPLATETEMPLATEPARM
257 
258DECL_RANGE(Template, BuiltinTemplate, TemplateTemplateParm)
259 
260#undef TEMPLATE
261 
262#ifndef TYPE
263#  define TYPE(Type, Base) NAMED(Type, Base)
264#endif
265ABSTRACT_DECL(TYPE(Type, NamedDecl))
266#ifndef TAG
267#  define TAG(Type, Base) TYPE(Type, Base)
268#endif
269ABSTRACT_DECL(TAG(Tag, TypeDecl))
270#ifndef ENUM
271#  define ENUM(Type, Base) TAG(Type, Base)
272#endif
273ENUM(Enum, TagDecl)
274#undef ENUM
275 
276#ifndef RECORD
277#  define RECORD(Type, Base) TAG(Type, Base)
278#endif
279RECORD(Record, TagDecl)
280#ifndef CXXRECORD
281#  define CXXRECORD(Type, Base) RECORD(Type, Base)
282#endif
283CXXRECORD(CXXRecord, RecordDecl)
284#ifndef CLASSTEMPLATESPECIALIZATION
285#  define CLASSTEMPLATESPECIALIZATION(Type, Base) CXXRECORD(Type, Base)
286#endif
287CLASSTEMPLATESPECIALIZATION(ClassTemplateSpecialization, CXXRecordDecl)
288#ifndef CLASSTEMPLATEPARTIALSPECIALIZATION
289#  define CLASSTEMPLATEPARTIALSPECIALIZATION(Type, Base) CLASSTEMPLATESPECIALIZATION(Type, Base)
290#endif
291CLASSTEMPLATEPARTIALSPECIALIZATION(ClassTemplatePartialSpecialization, ClassTemplateSpecializationDecl)
292#undef CLASSTEMPLATEPARTIALSPECIALIZATION
293 
294DECL_RANGE(ClassTemplateSpecialization, ClassTemplateSpecialization, ClassTemplatePartialSpecialization)
295 
296#undef CLASSTEMPLATESPECIALIZATION
297 
298DECL_RANGE(CXXRecord, CXXRecord, ClassTemplatePartialSpecialization)
299 
300#undef CXXRECORD
301 
302DECL_RANGE(Record, Record, ClassTemplatePartialSpecialization)
303 
304#undef RECORD
305 
306DECL_RANGE(Tag, Enum, ClassTemplatePartialSpecialization)
307 
308#undef TAG
309 
310#ifndef TEMPLATETYPEPARM
311#  define TEMPLATETYPEPARM(Type, Base) TYPE(Type, Base)
312#endif
313TEMPLATETYPEPARM(TemplateTypeParm, TypeDecl)
314#undef TEMPLATETYPEPARM
315 
316#ifndef TYPEDEFNAME
317#  define TYPEDEFNAME(Type, Base) TYPE(Type, Base)
318#endif
319ABSTRACT_DECL(TYPEDEFNAME(TypedefName, TypeDecl))
320#ifndef OBJCTYPEPARAM
321#  define OBJCTYPEPARAM(Type, Base) TYPEDEFNAME(Type, Base)
322#endif
323OBJCTYPEPARAM(ObjCTypeParam, TypedefNameDecl)
324#undef OBJCTYPEPARAM
325 
326#ifndef TYPEALIAS
327#  define TYPEALIAS(Type, Base) TYPEDEFNAME(Type, Base)
328#endif
329TYPEALIAS(TypeAlias, TypedefNameDecl)
330#undef TYPEALIAS
331 
332#ifndef TYPEDEF
333#  define TYPEDEF(Type, Base) TYPEDEFNAME(Type, Base)
334#endif
335TYPEDEF(Typedef, TypedefNameDecl)
336#undef TYPEDEF
337 
338DECL_RANGE(TypedefName, ObjCTypeParam, Typedef)
339 
340#undef TYPEDEFNAME
341 
342#ifndef UNRESOLVEDUSINGTYPENAME
343#  define UNRESOLVEDUSINGTYPENAME(Type, Base) TYPE(Type, Base)
344#endif
345UNRESOLVEDUSINGTYPENAME(UnresolvedUsingTypename, TypeDecl)
346#undef UNRESOLVEDUSINGTYPENAME
347 
348DECL_RANGE(Type, Enum, UnresolvedUsingTypename)
349 
350#undef TYPE
351 
352#ifndef UNRESOLVEDUSINGIFEXISTS
353#  define UNRESOLVEDUSINGIFEXISTS(Type, Base) NAMED(Type, Base)
354#endif
355UNRESOLVEDUSINGIFEXISTS(UnresolvedUsingIfExists, NamedDecl)
356#undef UNRESOLVEDUSINGIFEXISTS
357 
358#ifndef USINGDIRECTIVE
359#  define USINGDIRECTIVE(Type, Base) NAMED(Type, Base)
360#endif
361USINGDIRECTIVE(UsingDirective, NamedDecl)
362#undef USINGDIRECTIVE
363 
364#ifndef USINGPACK
365#  define USINGPACK(Type, Base) NAMED(Type, Base)
366#endif
367USINGPACK(UsingPack, NamedDecl)
368#undef USINGPACK
369 
370#ifndef USINGSHADOW
371#  define USINGSHADOW(Type, Base) NAMED(Type, Base)
372#endif
373USINGSHADOW(UsingShadow, NamedDecl)
374#ifndef CONSTRUCTORUSINGSHADOW
375#  define CONSTRUCTORUSINGSHADOW(Type, Base) USINGSHADOW(Type, Base)
376#endif
377CONSTRUCTORUSINGSHADOW(ConstructorUsingShadow, UsingShadowDecl)
378#undef CONSTRUCTORUSINGSHADOW
379 
380DECL_RANGE(UsingShadow, UsingShadow, ConstructorUsingShadow)
381 
382#undef USINGSHADOW
383 
384#ifndef VALUE
385#  define VALUE(Type, Base) NAMED(Type, Base)
386#endif
387ABSTRACT_DECL(VALUE(Value, NamedDecl))
388#ifndef BINDING
389#  define BINDING(Type, Base) VALUE(Type, Base)
390#endif
391BINDING(Binding, ValueDecl)
392#undef BINDING
393 
394#ifndef DECLARATOR
395#  define DECLARATOR(Type, Base) VALUE(Type, Base)
396#endif
397ABSTRACT_DECL(DECLARATOR(Declarator, ValueDecl))
398#ifndef FIELD
399#  define FIELD(Type, Base) DECLARATOR(Type, Base)
400#endif
401FIELD(Field, DeclaratorDecl)
402#ifndef OBJCATDEFSFIELD
403#  define OBJCATDEFSFIELD(Type, Base) FIELD(Type, Base)
404#endif
405OBJCATDEFSFIELD(ObjCAtDefsField, FieldDecl)
406#undef OBJCATDEFSFIELD
407 
408#ifndef OBJCIVAR
409#  define OBJCIVAR(Type, Base) FIELD(Type, Base)
410#endif
411OBJCIVAR(ObjCIvar, FieldDecl)
412#undef OBJCIVAR
413 
414DECL_RANGE(Field, Field, ObjCIvar)
415 
416#undef FIELD
417 
418#ifndef FUNCTION
419#  define FUNCTION(Type, Base) DECLARATOR(Type, Base)
420#endif
421FUNCTION(Function, DeclaratorDecl)
422#ifndef CXXDEDUCTIONGUIDE
423#  define CXXDEDUCTIONGUIDE(Type, Base) FUNCTION(Type, Base)
424#endif
425CXXDEDUCTIONGUIDE(CXXDeductionGuide, FunctionDecl)
426#undef CXXDEDUCTIONGUIDE
427 
428#ifndef CXXMETHOD
429#  define CXXMETHOD(Type, Base) FUNCTION(Type, Base)
430#endif
431CXXMETHOD(CXXMethod, FunctionDecl)
432#ifndef CXXCONSTRUCTOR
433#  define CXXCONSTRUCTOR(Type, Base) CXXMETHOD(Type, Base)
434#endif
435CXXCONSTRUCTOR(CXXConstructor, CXXMethodDecl)
436#undef CXXCONSTRUCTOR
437 
438#ifndef CXXCONVERSION
439#  define CXXCONVERSION(Type, Base) CXXMETHOD(Type, Base)
440#endif
441CXXCONVERSION(CXXConversion, CXXMethodDecl)
442#undef CXXCONVERSION
443 
444#ifndef CXXDESTRUCTOR
445#  define CXXDESTRUCTOR(Type, Base) CXXMETHOD(Type, Base)
446#endif
447CXXDESTRUCTOR(CXXDestructor, CXXMethodDecl)
448#undef CXXDESTRUCTOR
449 
450DECL_RANGE(CXXMethod, CXXMethod, CXXDestructor)
451 
452#undef CXXMETHOD
453 
454DECL_RANGE(Function, Function, CXXDestructor)
455 
456#undef FUNCTION
457 
458#ifndef MSPROPERTY
459#  define MSPROPERTY(Type, Base) DECLARATOR(Type, Base)
460#endif
461MSPROPERTY(MSProperty, DeclaratorDecl)
462#undef MSPROPERTY
463 
464#ifndef NONTYPETEMPLATEPARM
465#  define NONTYPETEMPLATEPARM(Type, Base) DECLARATOR(Type, Base)
466#endif
467NONTYPETEMPLATEPARM(NonTypeTemplateParm, DeclaratorDecl)
468#undef NONTYPETEMPLATEPARM
469 
470#ifndef VAR
471#  define VAR(Type, Base) DECLARATOR(Type, Base)
472#endif
473VAR(Var, DeclaratorDecl)
474#ifndef DECOMPOSITION
475#  define DECOMPOSITION(Type, Base) VAR(Type, Base)
476#endif
477DECOMPOSITION(Decomposition, VarDecl)
478#undef DECOMPOSITION
479 
480#ifndef IMPLICITPARAM
481#  define IMPLICITPARAM(Type, Base) VAR(Type, Base)
482#endif
483IMPLICITPARAM(ImplicitParam, VarDecl)
484#undef IMPLICITPARAM
485 
486#ifndef OMPCAPTUREDEXPR
487#  define OMPCAPTUREDEXPR(Type, Base) VAR(Type, Base)
488#endif
489OMPCAPTUREDEXPR(OMPCapturedExpr, VarDecl)
490#undef OMPCAPTUREDEXPR
491 
492#ifndef PARMVAR
493#  define PARMVAR(Type, Base) VAR(Type, Base)
494#endif
495PARMVAR(ParmVar, VarDecl)
496#undef PARMVAR
497 
498#ifndef VARTEMPLATESPECIALIZATION
499#  define VARTEMPLATESPECIALIZATION(Type, Base) VAR(Type, Base)
500#endif
501VARTEMPLATESPECIALIZATION(VarTemplateSpecialization, VarDecl)
502#ifndef VARTEMPLATEPARTIALSPECIALIZATION
503#  define VARTEMPLATEPARTIALSPECIALIZATION(Type, Base) VARTEMPLATESPECIALIZATION(Type, Base)
504#endif
505VARTEMPLATEPARTIALSPECIALIZATION(VarTemplatePartialSpecialization, VarTemplateSpecializationDecl)
506#undef VARTEMPLATEPARTIALSPECIALIZATION
507 
508DECL_RANGE(VarTemplateSpecialization, VarTemplateSpecialization, VarTemplatePartialSpecialization)
509 
510#undef VARTEMPLATESPECIALIZATION
511 
512DECL_RANGE(Var, Var, VarTemplatePartialSpecialization)
513 
514#undef VAR
515 
516DECL_RANGE(Declarator, Field, VarTemplatePartialSpecialization)
517 
518#undef DECLARATOR
519 
520#ifndef ENUMCONSTANT
521#  define ENUMCONSTANT(Type, Base) VALUE(Type, Base)
522#endif
523ENUMCONSTANT(EnumConstant, ValueDecl)
524#undef ENUMCONSTANT
525 
526#ifndef INDIRECTFIELD
527#  define INDIRECTFIELD(Type, Base) VALUE(Type, Base)
528#endif
529INDIRECTFIELD(IndirectField, ValueDecl)
530#undef INDIRECTFIELD
531 
532#ifndef MSGUID
533#  define MSGUID(Type, Base) VALUE(Type, Base)
534#endif
535MSGUID(MSGuid, ValueDecl)
536#undef MSGUID
537 
538#ifndef OMPDECLAREMAPPER
539#  define OMPDECLAREMAPPER(Type, Base) VALUE(Type, Base)
540#endif
541OMPDECLAREMAPPER(OMPDeclareMapper, ValueDecl)
542#undef OMPDECLAREMAPPER
543 
544#ifndef OMPDECLAREREDUCTION
545#  define OMPDECLAREREDUCTION(Type, Base) VALUE(Type, Base)
546#endif
547OMPDECLAREREDUCTION(OMPDeclareReduction, ValueDecl)
548#undef OMPDECLAREREDUCTION
549 
550#ifndef TEMPLATEPARAMOBJECT
551#  define TEMPLATEPARAMOBJECT(Type, Base) VALUE(Type, Base)
552#endif
553TEMPLATEPARAMOBJECT(TemplateParamObject, ValueDecl)
554#undef TEMPLATEPARAMOBJECT
555 
556#ifndef UNRESOLVEDUSINGVALUE
557#  define UNRESOLVEDUSINGVALUE(Type, Base) VALUE(Type, Base)
558#endif
559UNRESOLVEDUSINGVALUE(UnresolvedUsingValue, ValueDecl)
560#undef UNRESOLVEDUSINGVALUE
561 
562DECL_RANGE(Value, Binding, UnresolvedUsingValue)
563 
564#undef VALUE
565 
566DECL_RANGE(Named, Using, UnresolvedUsingValue)
567 
568#undef NAMED
569 
570#ifndef OMPALLOCATE
571#  define OMPALLOCATE(Type, Base) DECL(Type, Base)
572#endif
573OMPALLOCATE(OMPAllocate, Decl)
574#undef OMPALLOCATE
575 
576#ifndef OMPREQUIRES
577#  define OMPREQUIRES(Type, Base) DECL(Type, Base)
578#endif
579OMPREQUIRES(OMPRequires, Decl)
580#undef OMPREQUIRES
581 
582#ifndef OMPTHREADPRIVATE
583#  define OMPTHREADPRIVATE(Type, Base) DECL(Type, Base)
584#endif
585OMPTHREADPRIVATE(OMPThreadPrivate, Decl)
586#undef OMPTHREADPRIVATE
587 
588#ifndef OBJCPROPERTYIMPL
589#  define OBJCPROPERTYIMPL(Type, Base) DECL(Type, Base)
590#endif
591OBJCPROPERTYIMPL(ObjCPropertyImpl, Decl)
592#undef OBJCPROPERTYIMPL
593 
594#ifndef PRAGMACOMMENT
595#  define PRAGMACOMMENT(Type, Base) DECL(Type, Base)
596#endif
597PRAGMACOMMENT(PragmaComment, Decl)
598#undef PRAGMACOMMENT
599 
600#ifndef PRAGMADETECTMISMATCH
601#  define PRAGMADETECTMISMATCH(Type, Base) DECL(Type, Base)
602#endif
603PRAGMADETECTMISMATCH(PragmaDetectMismatch, Decl)
604#undef PRAGMADETECTMISMATCH
605 
606#ifndef REQUIRESEXPRBODY
607#  define REQUIRESEXPRBODY(Type, Base) DECL(Type, Base)
608#endif
609REQUIRESEXPRBODY(RequiresExprBody, Decl)
610#undef REQUIRESEXPRBODY
611 
612#ifndef STATICASSERT
613#  define STATICASSERT(Type, Base) DECL(Type, Base)
614#endif
615STATICASSERT(StaticAssert, Decl)
616#undef STATICASSERT
617 
618#ifndef TRANSLATIONUNIT
619#  define TRANSLATIONUNIT(Type, Base) DECL(Type, Base)
620#endif
621TRANSLATIONUNIT(TranslationUnit, Decl)
622#undef TRANSLATIONUNIT
623 
624LAST_DECL_RANGE(Decl, AccessSpec, TranslationUnit)
625 
626#undef DECL
627#undef DECL_RANGE
628#undef LAST_DECL_RANGE
629#undef ABSTRACT_DECL
630/*===- TableGen'erated file -------------------------------------*- C++ -*-===*\
631|*                                                                            *|
632|* List of AST Decl nodes                                                     *|
633|*                                                                            *|
634|* Automatically generated file, do not edit!                                 *|
635|*                                                                            *|
636\*===----------------------------------------------------------------------===*/
637 
638#ifndef DECL_CONTEXT
639#  define DECL_CONTEXT(DECL)
640#endif
641#ifndef DECL_CONTEXT_BASE
642#  define DECL_CONTEXT_BASE(DECL) DECL_CONTEXT(DECL)
643#endif
644DECL_CONTEXT_BASE(Function)
645DECL_CONTEXT_BASE(Tag)
646DECL_CONTEXT_BASE(ObjCContainer)
647DECL_CONTEXT(Block)
648DECL_CONTEXT(Captured)
649DECL_CONTEXT(Export)
650DECL_CONTEXT(ExternCContext)
651DECL_CONTEXT(LinkageSpec)
652DECL_CONTEXT(Namespace)
653DECL_CONTEXT(OMPDeclareMapper)
654DECL_CONTEXT(OMPDeclareReduction)
655DECL_CONTEXT(ObjCMethod)
656DECL_CONTEXT(RequiresExprBody)
657DECL_CONTEXT(TranslationUnit)
658#undef DECL_CONTEXT
659#undef DECL_CONTEXT_BASE

←

/usr/src/gnu/usr.bin/clang/libclangAST/../../../llvm/llvm/include/llvm/Support/Error.h

1//===- llvm/Support/Error.h - Recoverable error handling --------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file defines an API used to report recoverable errors.
10//
11//===----------------------------------------------------------------------===//
12 
13#ifndef LLVM_SUPPORT_ERROR_H
14#define LLVM_SUPPORT_ERROR_H
15 
16#include "llvm-c/Error.h"
17#include "llvm/ADT/STLExtras.h"
18#include "llvm/ADT/SmallVector.h"
19#include "llvm/ADT/StringExtras.h"
20#include "llvm/ADT/Twine.h"
21#include "llvm/Config/abi-breaking.h"
22#include "llvm/Support/AlignOf.h"
23#include "llvm/Support/Compiler.h"
24#include "llvm/Support/Debug.h"
25#include "llvm/Support/ErrorHandling.h"
26#include "llvm/Support/ErrorOr.h"
27#include "llvm/Support/Format.h"
28#include "llvm/Support/raw_ostream.h"
29#include <algorithm>
30#include <cassert>
31#include <cstdint>
32#include <cstdlib>
33#include <functional>
34#include <memory>
35#include <new>
36#include <string>
37#include <system_error>
38#include <type_traits>
39#include <utility>
40#include <vector>
41 
42namespace llvm {
43 
44class ErrorSuccess;
45 
46/// Base class for error info classes. Do not extend this directly: Extend
47/// the ErrorInfo template subclass instead.
48class ErrorInfoBase {
49public:
50  virtual ~ErrorInfoBase() = default;
51 
52  /// Print an error message to an output stream.
53  virtual void log(raw_ostream &OS) const = 0;
54 
55  /// Return the error message as a string.
56  virtual std::string message() const {
57    std::string Msg;
58    raw_string_ostream OS(Msg);
59    log(OS);
60    return OS.str();
61  }
62 
63  /// Convert this error to a std::error_code.
64  ///
65  /// This is a temporary crutch to enable interaction with code still
66  /// using std::error_code. It will be removed in the future.
67  virtual std::error_code convertToErrorCode() const = 0;
68 
69  // Returns the class ID for this type.
70  static const void *classID() { return &ID; }
71 
72  // Returns the class ID for the dynamic type of this ErrorInfoBase instance.
73  virtual const void *dynamicClassID() const = 0;
74 
75  // Check whether this instance is a subclass of the class identified by
76  // ClassID.
77  virtual bool isA(const void *const ClassID) const {
78    return ClassID == classID();
79  }
80 
81  // Check whether this instance is a subclass of ErrorInfoT.
82  template <typename ErrorInfoT> bool isA() const {
83    return isA(ErrorInfoT::classID());
84  }
85 
86private:
87  virtual void anchor();
88 
89  static char ID;
90};
91 
92/// Lightweight error class with error context and mandatory checking.
93///
94/// Instances of this class wrap a ErrorInfoBase pointer. Failure states
95/// are represented by setting the pointer to a ErrorInfoBase subclass
96/// instance containing information describing the failure. Success is
97/// represented by a null pointer value.
98///
99/// Instances of Error also contains a 'Checked' flag, which must be set
100/// before the destructor is called, otherwise the destructor will trigger a
101/// runtime error. This enforces at runtime the requirement that all Error
102/// instances be checked or returned to the caller.
103///
104/// There are two ways to set the checked flag, depending on what state the
105/// Error instance is in. For Error instances indicating success, it
106/// is sufficient to invoke the boolean conversion operator. E.g.:
107///
108///   @code{.cpp}
109///   Error foo(<...>);
110///
111///   if (auto E = foo(<...>))
112///     return E; // <- Return E if it is in the error state.
113///   // We have verified that E was in the success state. It can now be safely
114///   // destroyed.
115///   @endcode
116///
117/// A success value *can not* be dropped. For example, just calling 'foo(<...>)'
118/// without testing the return value will raise a runtime error, even if foo
119/// returns success.
120///
121/// For Error instances representing failure, you must use either the
122/// handleErrors or handleAllErrors function with a typed handler. E.g.:
123///
124///   @code{.cpp}
125///   class MyErrorInfo : public ErrorInfo<MyErrorInfo> {
126///     // Custom error info.
127///   };
128///
129///   Error foo(<...>) { return make_error<MyErrorInfo>(...); }
130///
131///   auto E = foo(<...>); // <- foo returns failure with MyErrorInfo.
132///   auto NewE =
133///     handleErrors(E,
134///       [](const MyErrorInfo &M) {
135///         // Deal with the error.
136///       },
137///       [](std::unique_ptr<OtherError> M) -> Error {
138///         if (canHandle(*M)) {
139///           // handle error.
140///           return Error::success();
141///         }
142///         // Couldn't handle this error instance. Pass it up the stack.
143///         return Error(std::move(M));
144///       );
145///   // Note - we must check or return NewE in case any of the handlers
146///   // returned a new error.
147///   @endcode
148///
149/// The handleAllErrors function is identical to handleErrors, except
150/// that it has a void return type, and requires all errors to be handled and
151/// no new errors be returned. It prevents errors (assuming they can all be
152/// handled) from having to be bubbled all the way to the top-level.
153///
154/// *All* Error instances must be checked before destruction, even if
155/// they're moved-assigned or constructed from Success values that have already
156/// been checked. This enforces checking through all levels of the call stack.
157class LLVM_NODISCARD[[clang::warn_unused_result]] Error {
158  // ErrorList needs to be able to yank ErrorInfoBase pointers out of Errors
159  // to add to the error list. It can't rely on handleErrors for this, since
160  // handleErrors does not support ErrorList handlers.
161  friend class ErrorList;
162 
163  // handleErrors needs to be able to set the Checked flag.
164  template <typename... HandlerTs>
165  friend Error handleErrors(Error E, HandlerTs &&... Handlers);
166 
167  // Expected<T> needs to be able to steal the payload when constructed from an
168  // error.
169  template <typename T> friend class Expected;
170 
171  // wrap needs to be able to steal the payload.
172  friend LLVMErrorRef wrap(Error);
173 
174protected:
175  /// Create a success value. Prefer using 'Error::success()' for readability
176  Error() {
177    setPtr(nullptr);
178    setChecked(false);
179  }
180 
181public:
182  /// Create a success value.
183  static ErrorSuccess success();
184 
185  // Errors are not copy-constructable.
186  Error(const Error &Other) = delete;
187 
188  /// Move-construct an error value. The newly constructed error is considered
189  /// unchecked, even if the source error had been checked. The original error
190  /// becomes a checked Success value, regardless of its original state.
191  Error(Error &&Other) {
192    setChecked(true);
193    *this = std::move(Other);
194  }
195 
196  /// Create an error value. Prefer using the 'make_error' function, but
197  /// this constructor can be useful when "re-throwing" errors from handlers.
198  Error(std::unique_ptr<ErrorInfoBase> Payload) {
199    setPtr(Payload.release());
200    setChecked(false);
201  }
202 
203  // Errors are not copy-assignable.
204  Error &operator=(const Error &Other) = delete;
205 
206  /// Move-assign an error value. The current error must represent success, you
207  /// you cannot overwrite an unhandled error. The current error is then
208  /// considered unchecked. The source error becomes a checked success value,
209  /// regardless of its original state.
210  Error &operator=(Error &&Other) {
211    // Don't allow overwriting of unchecked values.
212    assertIsChecked();
213    setPtr(Other.getPtr());
214 
215    // This Error is unchecked, even if the source error was checked.
216    setChecked(false);
217 
218    // Null out Other's payload and set its checked bit.
219    Other.setPtr(nullptr);
220    Other.setChecked(true);
221 
222    return *this;
223  }
224 
225  /// Destroy a Error. Fails with a call to abort() if the error is
226  /// unchecked.
227  ~Error() {
228    assertIsChecked();
229    delete getPtr();
230  }
231 
232  /// Bool conversion. Returns true if this Error is in a failure state,
233  /// and false if it is in an accept state. If the error is in a Success state
234  /// it will be considered checked.
235  explicit operator bool() {
236    setChecked(getPtr() == nullptr);
12
←
Assuming the condition is true→
24
←
Assuming the condition is true→
237    return getPtr() != nullptr;
13
←
Returning zero, which participates in a condition later→
25
←
Returning zero, which participates in a condition later→
238  }
239 
240  /// Check whether one error is a subclass of another.
241  template <typename ErrT> bool isA() const {
242    return getPtr() && getPtr()->isA(ErrT::classID());
243  }
244 
245  /// Returns the dynamic class id of this error, or null if this is a success
246  /// value.
247  const void* dynamicClassID() const {
248    if (!getPtr())
249      return nullptr;
250    return getPtr()->dynamicClassID();
251  }
252 
253private:
254#if LLVM_ENABLE_ABI_BREAKING_CHECKS0
255  // assertIsChecked() happens very frequently, but under normal circumstances
256  // is supposed to be a no-op.  So we want it to be inlined, but having a bunch
257  // of debug prints can cause the function to be too large for inlining.  So
258  // it's important that we define this function out of line so that it can't be
259  // inlined.
260  LLVM_ATTRIBUTE_NORETURN__attribute__((noreturn))
261  void fatalUncheckedError() const;
262#endif
263 
264  void assertIsChecked() {
265#if LLVM_ENABLE_ABI_BREAKING_CHECKS0
266    if (LLVM_UNLIKELY(!getChecked() || getPtr())__builtin_expect((bool)(!getChecked() || getPtr()), false))
267      fatalUncheckedError();
268#endif
269  }
270 
271  ErrorInfoBase *getPtr() const {
272#if LLVM_ENABLE_ABI_BREAKING_CHECKS0
273    return reinterpret_cast<ErrorInfoBase*>(
274             reinterpret_cast<uintptr_t>(Payload) &
275             ~static_cast<uintptr_t>(0x1));
276#else
277    return Payload;
278#endif
279  }
280 
281  void setPtr(ErrorInfoBase *EI) {
282#if LLVM_ENABLE_ABI_BREAKING_CHECKS0
283    Payload = reinterpret_cast<ErrorInfoBase*>(
284                (reinterpret_cast<uintptr_t>(EI) &
285                 ~static_cast<uintptr_t>(0x1)) |
286                (reinterpret_cast<uintptr_t>(Payload) & 0x1));
287#else
288    Payload = EI;
289#endif
290  }
291 
292  bool getChecked() const {
293#if LLVM_ENABLE_ABI_BREAKING_CHECKS0
294    return (reinterpret_cast<uintptr_t>(Payload) & 0x1) == 0;
295#else
296    return true;
297#endif
298  }
299 
300  void setChecked(bool V) {
301#if LLVM_ENABLE_ABI_BREAKING_CHECKS0
302    Payload = reinterpret_cast<ErrorInfoBase*>(
303                (reinterpret_cast<uintptr_t>(Payload) &
304                  ~static_cast<uintptr_t>(0x1)) |
305                  (V ? 0 : 1));
306#endif
307  }
308 
309  std::unique_ptr<ErrorInfoBase> takePayload() {
310    std::unique_ptr<ErrorInfoBase> Tmp(getPtr());
311    setPtr(nullptr);
312    setChecked(true);
313    return Tmp;
314  }
315 
316  friend raw_ostream &operator<<(raw_ostream &OS, const Error &E) {
317    if (auto P = E.getPtr())
318      P->log(OS);
319    else
320      OS << "success";
321    return OS;
322  }
323 
324  ErrorInfoBase *Payload = nullptr;
325};
326 
327/// Subclass of Error for the sole purpose of identifying the success path in
328/// the type system. This allows to catch invalid conversion to Expected<T> at
329/// compile time.
330class ErrorSuccess final : public Error {};
331 
332inline ErrorSuccess Error::success() { return ErrorSuccess(); }
333 
334/// Make a Error instance representing failure using the given error info
335/// type.
336template <typename ErrT, typename... ArgTs> Error make_error(ArgTs &&... Args) {
337  return Error(std::make_unique<ErrT>(std::forward<ArgTs>(Args)...));
338}
339 
340/// Base class for user error types. Users should declare their error types
341/// like:
342///
343/// class MyError : public ErrorInfo<MyError> {
344///   ....
345/// };
346///
347/// This class provides an implementation of the ErrorInfoBase::kind
348/// method, which is used by the Error RTTI system.
349template <typename ThisErrT, typename ParentErrT = ErrorInfoBase>
350class ErrorInfo : public ParentErrT {
351public:
352  using ParentErrT::ParentErrT; // inherit constructors
353 
354  static const void *classID() { return &ThisErrT::ID; }
355 
356  const void *dynamicClassID() const override { return &ThisErrT::ID; }
357 
358  bool isA(const void *const ClassID) const override {
359    return ClassID == classID() || ParentErrT::isA(ClassID);
360  }
361};
362 
363/// Special ErrorInfo subclass representing a list of ErrorInfos.
364/// Instances of this class are constructed by joinError.
365class ErrorList final : public ErrorInfo<ErrorList> {
366  // handleErrors needs to be able to iterate the payload list of an
367  // ErrorList.
368  template <typename... HandlerTs>
369  friend Error handleErrors(Error E, HandlerTs &&... Handlers);
370 
371  // joinErrors is implemented in terms of join.
372  friend Error joinErrors(Error, Error);
373 
374public:
375  void log(raw_ostream &OS) const override {
376    OS << "Multiple errors:\n";
377    for (auto &ErrPayload : Payloads) {
378      ErrPayload->log(OS);
379      OS << "\n";
380    }
381  }
382 
383  std::error_code convertToErrorCode() const override;
384 
385  // Used by ErrorInfo::classID.
386  static char ID;
387 
388private:
389  ErrorList(std::unique_ptr<ErrorInfoBase> Payload1,
390            std::unique_ptr<ErrorInfoBase> Payload2) {
391    assert(!Payload1->isA<ErrorList>() && !Payload2->isA<ErrorList>() &&((void)0)
392           "ErrorList constructor payloads should be singleton errors")((void)0);
393    Payloads.push_back(std::move(Payload1));
394    Payloads.push_back(std::move(Payload2));
395  }
396 
397  static Error join(Error E1, Error E2) {
398    if (!E1)
399      return E2;
400    if (!E2)
401      return E1;
402    if (E1.isA<ErrorList>()) {
403      auto &E1List = static_cast<ErrorList &>(*E1.getPtr());
404      if (E2.isA<ErrorList>()) {
405        auto E2Payload = E2.takePayload();
406        auto &E2List = static_cast<ErrorList &>(*E2Payload);
407        for (auto &Payload : E2List.Payloads)
408          E1List.Payloads.push_back(std::move(Payload));
409      } else
410        E1List.Payloads.push_back(E2.takePayload());
411 
412      return E1;
413    }
414    if (E2.isA<ErrorList>()) {
415      auto &E2List = static_cast<ErrorList &>(*E2.getPtr());
416      E2List.Payloads.insert(E2List.Payloads.begin(), E1.takePayload());
417      return E2;
418    }
419    return Error(std::unique_ptr<ErrorList>(
420        new ErrorList(E1.takePayload(), E2.takePayload())));
421  }
422 
423  std::vector<std::unique_ptr<ErrorInfoBase>> Payloads;
424};
425 
426/// Concatenate errors. The resulting Error is unchecked, and contains the
427/// ErrorInfo(s), if any, contained in E1, followed by the
428/// ErrorInfo(s), if any, contained in E2.
429inline Error joinErrors(Error E1, Error E2) {
430  return ErrorList::join(std::move(E1), std::move(E2));
431}
432 
433/// Tagged union holding either a T or a Error.
434///
435/// This class parallels ErrorOr, but replaces error_code with Error. Since
436/// Error cannot be copied, this class replaces getError() with
437/// takeError(). It also adds an bool errorIsA<ErrT>() method for testing the
438/// error class type.
439///
440/// Example usage of 'Expected<T>' as a function return type:
441///
442///   @code{.cpp}
443///     Expected<int> myDivide(int A, int B) {
444///       if (B == 0) {
445///         // return an Error
446///         return createStringError(inconvertibleErrorCode(),
447///                                  "B must not be zero!");
448///       }
449///       // return an integer
450///       return A / B;
451///     }
452///   @endcode
453///
454///   Checking the results of to a function returning 'Expected<T>':
455///   @code{.cpp}
456///     if (auto E = Result.takeError()) {
457///       // We must consume the error. Typically one of:
458///       // - return the error to our caller
459///       // - toString(), when logging
460///       // - consumeError(), to silently swallow the error
461///       // - handleErrors(), to distinguish error types
462///       errs() << "Problem with division " << toString(std::move(E)) << "\n";
463///       return;
464///     }
465///     // use the result
466///     outs() << "The answer is " << *Result << "\n";
467///   @endcode
468///
469///  For unit-testing a function returning an 'Expceted<T>', see the
470///  'EXPECT_THAT_EXPECTED' macros in llvm/Testing/Support/Error.h
471 
472template <class T> class LLVM_NODISCARD[[clang::warn_unused_result]] Expected {
473  template <class T1> friend class ExpectedAsOutParameter;
474  template <class OtherT> friend class Expected;
475 
476  static constexpr bool isRef = std::is_reference<T>::value;
477 
478  using wrap = std::reference_wrapper<std::remove_reference_t<T>>;
479 
480  using error_type = std::unique_ptr<ErrorInfoBase>;
481 
482public:
483  using storage_type = std::conditional_t<isRef, wrap, T>;
484  using value_type = T;
485 
486private:
487  using reference = std::remove_reference_t<T> &;
488  using const_reference = const std::remove_reference_t<T> &;
489  using pointer = std::remove_reference_t<T> *;
490  using const_pointer = const std::remove_reference_t<T> *;
491 
492public:
493  /// Create an Expected<T> error value from the given Error.
494  Expected(Error Err)
495      : HasError(true)
496#if LLVM_ENABLE_ABI_BREAKING_CHECKS0
497        // Expected is unchecked upon construction in Debug builds.
498        , Unchecked(true)
499#endif
500  {
501    assert(Err && "Cannot create Expected<T> from Error success value.")((void)0);
502    new (getErrorStorage()) error_type(Err.takePayload());
503  }
504 
505  /// Forbid to convert from Error::success() implicitly, this avoids having
506  /// Expected<T> foo() { return Error::success(); } which compiles otherwise
507  /// but triggers the assertion above.
508  Expected(ErrorSuccess) = delete;
509 
510  /// Create an Expected<T> success value from the given OtherT value, which
511  /// must be convertible to T.
512  template <typename OtherT>
513  Expected(OtherT &&Val,
514           std::enable_if_t<std::is_convertible<OtherT, T>::value> * = nullptr)
515      : HasError(false)
516#if LLVM_ENABLE_ABI_BREAKING_CHECKS0
517        // Expected is unchecked upon construction in Debug builds.
518        ,
519        Unchecked(true)
520#endif
521  {
522    new (getStorage()) storage_type(std::forward<OtherT>(Val));
523  }
524 
525  /// Move construct an Expected<T> value.
526  Expected(Expected &&Other) { moveConstruct(std::move(Other)); }
527 
528  /// Move construct an Expected<T> value from an Expected<OtherT>, where OtherT
529  /// must be convertible to T.
530  template <class OtherT>
531  Expected(
532      Expected<OtherT> &&Other,
533      std::enable_if_t<std::is_convertible<OtherT, T>::value> * = nullptr) {
534    moveConstruct(std::move(Other));
535  }
536 
537  /// Move construct an Expected<T> value from an Expected<OtherT>, where OtherT
538  /// isn't convertible to T.
539  template <class OtherT>
540  explicit Expected(
541      Expected<OtherT> &&Other,
542      std::enable_if_t<!std::is_convertible<OtherT, T>::value> * = nullptr) {
543    moveConstruct(std::move(Other));
544  }
545 
546  /// Move-assign from another Expected<T>.
547  Expected &operator=(Expected &&Other) {
548    moveAssign(std::move(Other));
549    return *this;
550  }
551 
552  /// Destroy an Expected<T>.
553  ~Expected() {
554    assertIsChecked();
555    if (!HasError)
556      getStorage()->~storage_type();
557    else
558      getErrorStorage()->~error_type();
559  }
560 
561  /// Return false if there is an error.
562  explicit operator bool() {
563#if LLVM_ENABLE_ABI_BREAKING_CHECKS0
564    Unchecked = HasError;
565#endif
566    return !HasError;
567  }
568 
569  /// Returns a reference to the stored T value.
570  reference get() {
571    assertIsChecked();
572    return *getStorage();
573  }
574 
575  /// Returns a const reference to the stored T value.
576  const_reference get() const {
577    assertIsChecked();
578    return const_cast<Expected<T> *>(this)->get();
579  }
580 
581  /// Check that this Expected<T> is an error of type ErrT.
582  template <typename ErrT> bool errorIsA() const {
583    return HasError && (*getErrorStorage())->template isA<ErrT>();
584  }
585 
586  /// Take ownership of the stored error.
587  /// After calling this the Expected<T> is in an indeterminate state that can
588  /// only be safely destructed. No further calls (beside the destructor) should
589  /// be made on the Expected<T> value.
590  Error takeError() {
591#if LLVM_ENABLE_ABI_BREAKING_CHECKS0
592    Unchecked = false;
593#endif
594    return HasError ? Error(std::move(*getErrorStorage())) : Error::success();
595  }
596 
597  /// Returns a pointer to the stored T value.
598  pointer operator->() {
599    assertIsChecked();
600    return toPointer(getStorage());
601  }
602 
603  /// Returns a const pointer to the stored T value.
604  const_pointer operator->() const {
605    assertIsChecked();
606    return toPointer(getStorage());
607  }
608 
609  /// Returns a reference to the stored T value.
610  reference operator*() {
611    assertIsChecked();
612    return *getStorage();
613  }
614 
615  /// Returns a const reference to the stored T value.
616  const_reference operator*() const {
617    assertIsChecked();
618    return *getStorage();
619  }
620 
621private:
622  template <class T1>
623  static bool compareThisIfSameType(const T1 &a, const T1 &b) {
624    return &a == &b;
625  }
626 
627  template <class T1, class T2>
628  static bool compareThisIfSameType(const T1 &, const T2 &) {
629    return false;
630  }
631 
632  template <class OtherT> void moveConstruct(Expected<OtherT> &&Other) {
633    HasError = Other.HasError;
634#if LLVM_ENABLE_ABI_BREAKING_CHECKS0
635    Unchecked = true;
636    Other.Unchecked = false;
637#endif
638 
639    if (!HasError)
640      new (getStorage()) storage_type(std::move(*Other.getStorage()));
641    else
642      new (getErrorStorage()) error_type(std::move(*Other.getErrorStorage()));
643  }
644 
645  template <class OtherT> void moveAssign(Expected<OtherT> &&Other) {
646    assertIsChecked();
647 
648    if (compareThisIfSameType(*this, Other))
649      return;
650 
651    this->~Expected();
652    new (this) Expected(std::move(Other));
653  }
654 
655  pointer toPointer(pointer Val) { return Val; }
656 
657  const_pointer toPointer(const_pointer Val) const { return Val; }
658 
659  pointer toPointer(wrap *Val) { return &Val->get(); }
660 
661  const_pointer toPointer(const wrap *Val) const { return &Val->get(); }
662 
663  storage_type *getStorage() {
664    assert(!HasError && "Cannot get value when an error exists!")((void)0);
665    return reinterpret_cast<storage_type *>(&TStorage);
666  }
667 
668  const storage_type *getStorage() const {
669    assert(!HasError && "Cannot get value when an error exists!")((void)0);
670    return reinterpret_cast<const storage_type *>(&TStorage);
671  }
672 
673  error_type *getErrorStorage() {
674    assert(HasError && "Cannot get error when a value exists!")((void)0);
675    return reinterpret_cast<error_type *>(&ErrorStorage);
676  }
677 
678  const error_type *getErrorStorage() const {
679    assert(HasError && "Cannot get error when a value exists!")((void)0);
680    return reinterpret_cast<const error_type *>(&ErrorStorage);
681  }
682 
683  // Used by ExpectedAsOutParameter to reset the checked flag.
684  void setUnchecked() {
685#if LLVM_ENABLE_ABI_BREAKING_CHECKS0
686    Unchecked = true;
687#endif
688  }
689 
690#if LLVM_ENABLE_ABI_BREAKING_CHECKS0
691  LLVM_ATTRIBUTE_NORETURN__attribute__((noreturn))
692  LLVM_ATTRIBUTE_NOINLINE__attribute__((noinline))
693  void fatalUncheckedExpected() const {
694    dbgs() << "Expected<T> must be checked before access or destruction.\n";
695    if (HasError) {
696      dbgs() << "Unchecked Expected<T> contained error:\n";
697      (*getErrorStorage())->log(dbgs());
698    } else
699      dbgs() << "Expected<T> value was in success state. (Note: Expected<T> "
700                "values in success mode must still be checked prior to being "
701                "destroyed).\n";
702    abort();
703  }
704#endif
705 
706  void assertIsChecked() const {
707#if LLVM_ENABLE_ABI_BREAKING_CHECKS0
708    if (LLVM_UNLIKELY(Unchecked)__builtin_expect((bool)(Unchecked), false))
709      fatalUncheckedExpected();
710#endif
711  }
712 
713  union {
714    AlignedCharArrayUnion<storage_type> TStorage;
715    AlignedCharArrayUnion<error_type> ErrorStorage;
716  };
717  bool HasError : 1;
718#if LLVM_ENABLE_ABI_BREAKING_CHECKS0
719  bool Unchecked : 1;
720#endif
721};
722 
723/// Report a serious error, calling any installed error handler. See
724/// ErrorHandling.h.
725LLVM_ATTRIBUTE_NORETURN__attribute__((noreturn)) void report_fatal_error(Error Err,
726                                                bool gen_crash_diag = true);
727 
728/// Report a fatal error if Err is a failure value.
729///
730/// This function can be used to wrap calls to fallible functions ONLY when it
731/// is known that the Error will always be a success value. E.g.
732///
733///   @code{.cpp}
734///   // foo only attempts the fallible operation if DoFallibleOperation is
735///   // true. If DoFallibleOperation is false then foo always returns
736///   // Error::success().
737///   Error foo(bool DoFallibleOperation);
738///
739///   cantFail(foo(false));
740///   @endcode
741inline void cantFail(Error Err, const char *Msg = nullptr) {
742  if (Err) {
743    if (!Msg)
744      Msg = "Failure value returned from cantFail wrapped call";
745#ifndef NDEBUG1
746    std::string Str;
747    raw_string_ostream OS(Str);
748    OS << Msg << "\n" << Err;
749    Msg = OS.str().c_str();
750#endif
751    llvm_unreachable(Msg)__builtin_unreachable();
752  }
753}
754 
755/// Report a fatal error if ValOrErr is a failure value, otherwise unwraps and
756/// returns the contained value.
757///
758/// This function can be used to wrap calls to fallible functions ONLY when it
759/// is known that the Error will always be a success value. E.g.
760///
761///   @code{.cpp}
762///   // foo only attempts the fallible operation if DoFallibleOperation is
763///   // true. If DoFallibleOperation is false then foo always returns an int.
764///   Expected<int> foo(bool DoFallibleOperation);
765///
766///   int X = cantFail(foo(false));
767///   @endcode
768template <typename T>
769T cantFail(Expected<T> ValOrErr, const char *Msg = nullptr) {
770  if (ValOrErr)
771    return std::move(*ValOrErr);
772  else {
773    if (!Msg)
774      Msg = "Failure value returned from cantFail wrapped call";
775#ifndef NDEBUG1
776    std::string Str;
777    raw_string_ostream OS(Str);
778    auto E = ValOrErr.takeError();
779    OS << Msg << "\n" << E;
780    Msg = OS.str().c_str();
781#endif
782    llvm_unreachable(Msg)__builtin_unreachable();
783  }
784}
785 
786/// Report a fatal error if ValOrErr is a failure value, otherwise unwraps and
787/// returns the contained reference.
788///
789/// This function can be used to wrap calls to fallible functions ONLY when it
790/// is known that the Error will always be a success value. E.g.
791///
792///   @code{.cpp}
793///   // foo only attempts the fallible operation if DoFallibleOperation is
794///   // true. If DoFallibleOperation is false then foo always returns a Bar&.
795///   Expected<Bar&> foo(bool DoFallibleOperation);
796///
797///   Bar &X = cantFail(foo(false));
798///   @endcode
799template <typename T>
800T& cantFail(Expected<T&> ValOrErr, const char *Msg = nullptr) {
801  if (ValOrErr)
802    return *ValOrErr;
803  else {
804    if (!Msg)
805      Msg = "Failure value returned from cantFail wrapped call";
806#ifndef NDEBUG1
807    std::string Str;
808    raw_string_ostream OS(Str);
809    auto E = ValOrErr.takeError();
810    OS << Msg << "\n" << E;
811    Msg = OS.str().c_str();
812#endif
813    llvm_unreachable(Msg)__builtin_unreachable();
814  }
815}
816 
817/// Helper for testing applicability of, and applying, handlers for
818/// ErrorInfo types.
819template <typename HandlerT>
820class ErrorHandlerTraits
821    : public ErrorHandlerTraits<decltype(
822          &std::remove_reference<HandlerT>::type::operator())> {};
823 
824// Specialization functions of the form 'Error (const ErrT&)'.
825template <typename ErrT> class ErrorHandlerTraits<Error (&)(ErrT &)> {
826public:
827  static bool appliesTo(const ErrorInfoBase &E) {
828    return E.template isA<ErrT>();
829  }
830 
831  template <typename HandlerT>
832  static Error apply(HandlerT &&H, std::unique_ptr<ErrorInfoBase> E) {
833    assert(appliesTo(*E) && "Applying incorrect handler")((void)0);
834    return H(static_cast<ErrT &>(*E));
835  }
836};
837 
838// Specialization functions of the form 'void (const ErrT&)'.
839template <typename ErrT> class ErrorHandlerTraits<void (&)(ErrT &)> {
840public:
841  static bool appliesTo(const ErrorInfoBase &E) {
842    return E.template isA<ErrT>();
843  }
844 
845  template <typename HandlerT>
846  static Error apply(HandlerT &&H, std::unique_ptr<ErrorInfoBase> E) {
847    assert(appliesTo(*E) && "Applying incorrect handler")((void)0);
848    H(static_cast<ErrT &>(*E));
849    return Error::success();
850  }
851};
852 
853/// Specialization for functions of the form 'Error (std::unique_ptr<ErrT>)'.
854template <typename ErrT>
855class ErrorHandlerTraits<Error (&)(std::unique_ptr<ErrT>)> {
856public:
857  static bool appliesTo(const ErrorInfoBase &E) {
858    return E.template isA<ErrT>();
859  }
860 
861  template <typename HandlerT>
862  static Error apply(HandlerT &&H, std::unique_ptr<ErrorInfoBase> E) {
863    assert(appliesTo(*E) && "Applying incorrect handler")((void)0);
864    std::unique_ptr<ErrT> SubE(static_cast<ErrT *>(E.release()));
865    return H(std::move(SubE));
866  }
867};
868 
869/// Specialization for functions of the form 'void (std::unique_ptr<ErrT>)'.
870template <typename ErrT>
871class ErrorHandlerTraits<void (&)(std::unique_ptr<ErrT>)> {
872public:
873  static bool appliesTo(const ErrorInfoBase &E) {
874    return E.template isA<ErrT>();
875  }
876 
877  template <typename HandlerT>
878  static Error apply(HandlerT &&H, std::unique_ptr<ErrorInfoBase> E) {
879    assert(appliesTo(*E) && "Applying incorrect handler")((void)0);
880    std::unique_ptr<ErrT> SubE(static_cast<ErrT *>(E.release()));
881    H(std::move(SubE));
882    return Error::success();
883  }
884};
885 
886// Specialization for member functions of the form 'RetT (const ErrT&)'.
887template <typename C, typename RetT, typename ErrT>
888class ErrorHandlerTraits<RetT (C::*)(ErrT &)>
889    : public ErrorHandlerTraits<RetT (&)(ErrT &)> {};
890 
891// Specialization for member functions of the form 'RetT (const ErrT&) const'.
892template <typename C, typename RetT, typename ErrT>
893class ErrorHandlerTraits<RetT (C::*)(ErrT &) const>
894    : public ErrorHandlerTraits<RetT (&)(ErrT &)> {};
895 
896// Specialization for member functions of the form 'RetT (const ErrT&)'.
897template <typename C, typename RetT, typename ErrT>
898class ErrorHandlerTraits<RetT (C::*)(const ErrT &)>
899    : public ErrorHandlerTraits<RetT (&)(ErrT &)> {};
900 
901// Specialization for member functions of the form 'RetT (const ErrT&) const'.
902template <typename C, typename RetT, typename ErrT>
903class ErrorHandlerTraits<RetT (C::*)(const ErrT &) const>
904    : public ErrorHandlerTraits<RetT (&)(ErrT &)> {};
905 
906/// Specialization for member functions of the form
907/// 'RetT (std::unique_ptr<ErrT>)'.
908template <typename C, typename RetT, typename ErrT>
909class ErrorHandlerTraits<RetT (C::*)(std::unique_ptr<ErrT>)>
910    : public ErrorHandlerTraits<RetT (&)(std::unique_ptr<ErrT>)> {};
911 
912/// Specialization for member functions of the form
913/// 'RetT (std::unique_ptr<ErrT>) const'.
914template <typename C, typename RetT, typename ErrT>
915class ErrorHandlerTraits<RetT (C::*)(std::unique_ptr<ErrT>) const>
916    : public ErrorHandlerTraits<RetT (&)(std::unique_ptr<ErrT>)> {};
917 
918inline Error handleErrorImpl(std::unique_ptr<ErrorInfoBase> Payload) {
919  return Error(std::move(Payload));
920}
921 
922template <typename HandlerT, typename... HandlerTs>
923Error handleErrorImpl(std::unique_ptr<ErrorInfoBase> Payload,
924                      HandlerT &&Handler, HandlerTs &&... Handlers) {
925  if (ErrorHandlerTraits<HandlerT>::appliesTo(*Payload))
926    return ErrorHandlerTraits<HandlerT>::apply(std::forward<HandlerT>(Handler),
927                                               std::move(Payload));
928  return handleErrorImpl(std::move(Payload),
929                         std::forward<HandlerTs>(Handlers)...);
930}
931 
932/// Pass the ErrorInfo(s) contained in E to their respective handlers. Any
933/// unhandled errors (or Errors returned by handlers) are re-concatenated and
934/// returned.
935/// Because this function returns an error, its result must also be checked
936/// or returned. If you intend to handle all errors use handleAllErrors
937/// (which returns void, and will abort() on unhandled errors) instead.
938template <typename... HandlerTs>
939Error handleErrors(Error E, HandlerTs &&... Hs) {
940  if (!E)
941    return Error::success();
942 
943  std::unique_ptr<ErrorInfoBase> Payload = E.takePayload();
944 
945  if (Payload->isA<ErrorList>()) {
946    ErrorList &List = static_cast<ErrorList &>(*Payload);
947    Error R;
948    for (auto &P : List.Payloads)
949      R = ErrorList::join(
950          std::move(R),
951          handleErrorImpl(std::move(P), std::forward<HandlerTs>(Hs)...));
952    return R;
953  }
954 
955  return handleErrorImpl(std::move(Payload), std::forward<HandlerTs>(Hs)...);
956}
957 
958/// Behaves the same as handleErrors, except that by contract all errors
959/// *must* be handled by the given handlers (i.e. there must be no remaining
960/// errors after running the handlers, or llvm_unreachable is called).
961template <typename... HandlerTs>
962void handleAllErrors(Error E, HandlerTs &&... Handlers) {
963  cantFail(handleErrors(std::move(E), std::forward<HandlerTs>(Handlers)...));
964}
965 
966/// Check that E is a non-error, then drop it.
967/// If E is an error, llvm_unreachable will be called.
968inline void handleAllErrors(Error E) {
969  cantFail(std::move(E));
970}
971 
972/// Handle any errors (if present) in an Expected<T>, then try a recovery path.
973///
974/// If the incoming value is a success value it is returned unmodified. If it
975/// is a failure value then it the contained error is passed to handleErrors.
976/// If handleErrors is able to handle the error then the RecoveryPath functor
977/// is called to supply the final result. If handleErrors is not able to
978/// handle all errors then the unhandled errors are returned.
979///
980/// This utility enables the follow pattern:
981///
982///   @code{.cpp}
983///   enum FooStrategy { Aggressive, Conservative };
984///   Expected<Foo> foo(FooStrategy S);
985///
986///   auto ResultOrErr =
987///     handleExpected(
988///       foo(Aggressive),
989///       []() { return foo(Conservative); },
990///       [](AggressiveStrategyError&) {
991///         // Implicitly conusme this - we'll recover by using a conservative
992///         // strategy.
993///       });
994///
995///   @endcode
996template <typename T, typename RecoveryFtor, typename... HandlerTs>
997Expected<T> handleExpected(Expected<T> ValOrErr, RecoveryFtor &&RecoveryPath,
998                           HandlerTs &&... Handlers) {
999  if (ValOrErr)
1000    return ValOrErr;
1001 
1002  if (auto Err = handleErrors(ValOrErr.takeError(),
1003                              std::forward<HandlerTs>(Handlers)...))
1004    return std::move(Err);
1005 
1006  return RecoveryPath();
1007}
1008 
1009/// Log all errors (if any) in E to OS. If there are any errors, ErrorBanner
1010/// will be printed before the first one is logged. A newline will be printed
1011/// after each error.
1012///
1013/// This function is compatible with the helpers from Support/WithColor.h. You
1014/// can pass any of them as the OS. Please consider using them instead of
1015/// including 'error: ' in the ErrorBanner.
1016///
1017/// This is useful in the base level of your program to allow clean termination
1018/// (allowing clean deallocation of resources, etc.), while reporting error
1019/// information to the user.
1020void logAllUnhandledErrors(Error E, raw_ostream &OS, Twine ErrorBanner = {});
1021 
1022/// Write all error messages (if any) in E to a string. The newline character
1023/// is used to separate error messages.
1024inline std::string toString(Error E) {
1025  SmallVector<std::string, 2> Errors;
1026  handleAllErrors(std::move(E), [&Errors](const ErrorInfoBase &EI) {
1027    Errors.push_back(EI.message());
1028  });
1029  return join(Errors.begin(), Errors.end(), "\n");
1030}
1031 
1032/// Consume a Error without doing anything. This method should be used
1033/// only where an error can be considered a reasonable and expected return
1034/// value.
1035///
1036/// Uses of this method are potentially indicative of design problems: If it's
1037/// legitimate to do nothing while processing an "error", the error-producer
1038/// might be more clearly refactored to return an Optional<T>.
1039inline void consumeError(Error Err) {
1040  handleAllErrors(std::move(Err), [](const ErrorInfoBase &) {});
1041}
1042 
1043/// Convert an Expected to an Optional without doing anything. This method
1044/// should be used only where an error can be considered a reasonable and
1045/// expected return value.
1046///
1047/// Uses of this method are potentially indicative of problems: perhaps the
1048/// error should be propagated further, or the error-producer should just
1049/// return an Optional in the first place.
1050template <typename T> Optional<T> expectedToOptional(Expected<T> &&E) {
1051  if (E)
1052    return std::move(*E);
1053  consumeError(E.takeError());
1054  return None;
1055}
1056 
1057/// Helper for converting an Error to a bool.
1058///
1059/// This method returns true if Err is in an error state, or false if it is
1060/// in a success state.  Puts Err in a checked state in both cases (unlike
1061/// Error::operator bool(), which only does this for success states).
1062inline bool errorToBool(Error Err) {
1063  bool IsError = static_cast<bool>(Err);
1064  if (IsError)
1065    consumeError(std::move(Err));
1066  return IsError;
1067}
1068 
1069/// Helper for Errors used as out-parameters.
1070///
1071/// This helper is for use with the Error-as-out-parameter idiom, where an error
1072/// is passed to a function or method by reference, rather than being returned.
1073/// In such cases it is helpful to set the checked bit on entry to the function
1074/// so that the error can be written to (unchecked Errors abort on assignment)
1075/// and clear the checked bit on exit so that clients cannot accidentally forget
1076/// to check the result. This helper performs these actions automatically using
1077/// RAII:
1078///
1079///   @code{.cpp}
1080///   Result foo(Error &Err) {
1081///     ErrorAsOutParameter ErrAsOutParam(&Err); // 'Checked' flag set
1082///     // <body of foo>
1083///     // <- 'Checked' flag auto-cleared when ErrAsOutParam is destructed.
1084///   }
1085///   @endcode
1086///
1087/// ErrorAsOutParameter takes an Error* rather than Error& so that it can be
1088/// used with optional Errors (Error pointers that are allowed to be null). If
1089/// ErrorAsOutParameter took an Error reference, an instance would have to be
1090/// created inside every condition that verified that Error was non-null. By
1091/// taking an Error pointer we can just create one instance at the top of the
1092/// function.
1093class ErrorAsOutParameter {
1094public:
1095  ErrorAsOutParameter(Error *Err) : Err(Err) {
1096    // Raise the checked bit if Err is success.
1097    if (Err)
1098      (void)!!*Err;
1099  }
1100 
1101  ~ErrorAsOutParameter() {
1102    // Clear the checked bit.
1103    if (Err && !*Err)
1104      *Err = Error::success();
1105  }
1106 
1107private:
1108  Error *Err;
1109};
1110 
1111/// Helper for Expected<T>s used as out-parameters.
1112///
1113/// See ErrorAsOutParameter.
1114template <typename T>
1115class ExpectedAsOutParameter {
1116public:
1117  ExpectedAsOutParameter(Expected<T> *ValOrErr)
1118    : ValOrErr(ValOrErr) {
1119    if (ValOrErr)
1120      (void)!!*ValOrErr;
1121  }
1122 
1123  ~ExpectedAsOutParameter() {
1124    if (ValOrErr)
1125      ValOrErr->setUnchecked();
1126  }
1127 
1128private:
1129  Expected<T> *ValOrErr;
1130};
1131 
1132/// This class wraps a std::error_code in a Error.
1133///
1134/// This is useful if you're writing an interface that returns a Error
1135/// (or Expected) and you want to call code that still returns
1136/// std::error_codes.
1137class ECError : public ErrorInfo<ECError> {
1138  friend Error errorCodeToError(std::error_code);
1139 
1140  virtual void anchor() override;
1141 
1142public:
1143  void setErrorCode(std::error_code EC) { this->EC = EC; }
1144  std::error_code convertToErrorCode() const override { return EC; }
1145  void log(raw_ostream &OS) const override { OS << EC.message(); }
1146 
1147  // Used by ErrorInfo::classID.
1148  static char ID;
1149 
1150protected:
1151  ECError() = default;
1152  ECError(std::error_code EC) : EC(EC) {}
1153 
1154  std::error_code EC;
1155};
1156 
1157/// The value returned by this function can be returned from convertToErrorCode
1158/// for Error values where no sensible translation to std::error_code exists.
1159/// It should only be used in this situation, and should never be used where a
1160/// sensible conversion to std::error_code is available, as attempts to convert
1161/// to/from this error will result in a fatal error. (i.e. it is a programmatic
1162///error to try to convert such a value).
1163std::error_code inconvertibleErrorCode();
1164 
1165/// Helper for converting an std::error_code to a Error.
1166Error errorCodeToError(std::error_code EC);
1167 
1168/// Helper for converting an ECError to a std::error_code.
1169///
1170/// This method requires that Err be Error() or an ECError, otherwise it
1171/// will trigger a call to abort().
1172std::error_code errorToErrorCode(Error Err);
1173 
1174/// Convert an ErrorOr<T> to an Expected<T>.
1175template <typename T> Expected<T> errorOrToExpected(ErrorOr<T> &&EO) {
1176  if (auto EC = EO.getError())
1177    return errorCodeToError(EC);
1178  return std::move(*EO);
1179}
1180 
1181/// Convert an Expected<T> to an ErrorOr<T>.
1182template <typename T> ErrorOr<T> expectedToErrorOr(Expected<T> &&E) {
1183  if (auto Err = E.takeError())
1184    return errorToErrorCode(std::move(Err));
1185  return std::move(*E);
1186}
1187 
1188/// This class wraps a string in an Error.
1189///
1190/// StringError is useful in cases where the client is not expected to be able
1191/// to consume the specific error message programmatically (for example, if the
1192/// error message is to be presented to the user).
1193///
1194/// StringError can also be used when additional information is to be printed
1195/// along with a error_code message. Depending on the constructor called, this
1196/// class can either display:
1197///    1. the error_code message (ECError behavior)
1198///    2. a string
1199///    3. the error_code message and a string
1200///
1201/// These behaviors are useful when subtyping is required; for example, when a
1202/// specific library needs an explicit error type. In the example below,
1203/// PDBError is derived from StringError:
1204///
1205///   @code{.cpp}
1206///   Expected<int> foo() {
1207///      return llvm::make_error<PDBError>(pdb_error_code::dia_failed_loading,
1208///                                        "Additional information");
1209///   }
1210///   @endcode
1211///
1212class StringError : public ErrorInfo<StringError> {
1213public:
1214  static char ID;
1215 
1216  // Prints EC + S and converts to EC
1217  StringError(std::error_code EC, const Twine &S = Twine());
1218 
1219  // Prints S and converts to EC
1220  StringError(const Twine &S, std::error_code EC);
1221 
1222  void log(raw_ostream &OS) const override;
1223  std::error_code convertToErrorCode() const override;
1224 
1225  const std::string &getMessage() const { return Msg; }
1226 
1227private:
1228  std::string Msg;
1229  std::error_code EC;
1230  const bool PrintMsgOnly = false;
1231};
1232 
1233/// Create formatted StringError object.
1234template <typename... Ts>
1235inline Error createStringError(std::error_code EC, char const *Fmt,
1236                               const Ts &... Vals) {
1237  std::string Buffer;
1238  raw_string_ostream Stream(Buffer);
1239  Stream << format(Fmt, Vals...);
1240  return make_error<StringError>(Stream.str(), EC);
1241}
1242 
1243Error createStringError(std::error_code EC, char const *Msg);
1244 
1245inline Error createStringError(std::error_code EC, const Twine &S) {
1246  return createStringError(EC, S.str().c_str());
1247}
1248 
1249template <typename... Ts>
1250inline Error createStringError(std::errc EC, char const *Fmt,
1251                               const Ts &... Vals) {
1252  return createStringError(std::make_error_code(EC), Fmt, Vals...);
1253}
1254 
1255/// This class wraps a filename and another Error.
1256///
1257/// In some cases, an error needs to live along a 'source' name, in order to
1258/// show more detailed information to the user.
1259class FileError final : public ErrorInfo<FileError> {
1260 
1261  friend Error createFileError(const Twine &, Error);
1262  friend Error createFileError(const Twine &, size_t, Error);
1263 
1264public:
1265  void log(raw_ostream &OS) const override {
1266    assert(Err && !FileName.empty() && "Trying to log after takeError().")((void)0);
1267    OS << "'" << FileName << "': ";
1268    if (Line.hasValue())
1269      OS << "line " << Line.getValue() << ": ";
1270    Err->log(OS);
1271  }
1272 
1273  StringRef getFileName() { return FileName; }
1274 
1275  Error takeError() { return Error(std::move(Err)); }
1276 
1277  std::error_code convertToErrorCode() const override;
1278 
1279  // Used by ErrorInfo::classID.
1280  static char ID;
1281 
1282private:
1283  FileError(const Twine &F, Optional<size_t> LineNum,
1284            std::unique_ptr<ErrorInfoBase> E) {
1285    assert(E && "Cannot create FileError from Error success value.")((void)0);
1286    assert(!F.isTriviallyEmpty() &&((void)0)
1287           "The file name provided to FileError must not be empty.")((void)0);
1288    FileName = F.str();
1289    Err = std::move(E);
1290    Line = std::move(LineNum);
1291  }
1292 
1293  static Error build(const Twine &F, Optional<size_t> Line, Error E) {
1294    std::unique_ptr<ErrorInfoBase> Payload;
1295    handleAllErrors(std::move(E),
1296                    [&](std::unique_ptr<ErrorInfoBase> EIB) -> Error {
1297                      Payload = std::move(EIB);
1298                      return Error::success();
1299                    });
1300    return Error(
1301        std::unique_ptr<FileError>(new FileError(F, Line, std::move(Payload))));
1302  }
1303 
1304  std::string FileName;
1305  Optional<size_t> Line;
1306  std::unique_ptr<ErrorInfoBase> Err;
1307};
1308 
1309/// Concatenate a source file path and/or name with an Error. The resulting
1310/// Error is unchecked.
1311inline Error createFileError(const Twine &F, Error E) {
1312  return FileError::build(F, Optional<size_t>(), std::move(E));
1313}
1314 
1315/// Concatenate a source file path and/or name with line number and an Error.
1316/// The resulting Error is unchecked.
1317inline Error createFileError(const Twine &F, size_t Line, Error E) {
1318  return FileError::build(F, Optional<size_t>(Line), std::move(E));
1319}
1320 
1321/// Concatenate a source file path and/or name with a std::error_code 
1322/// to form an Error object.
1323inline Error createFileError(const Twine &F, std::error_code EC) {
1324  return createFileError(F, errorCodeToError(EC));
1325}
1326 
1327/// Concatenate a source file path and/or name with line number and
1328/// std::error_code to form an Error object.
1329inline Error createFileError(const Twine &F, size_t Line, std::error_code EC) {
1330  return createFileError(F, Line, errorCodeToError(EC));
1331}
1332 
1333Error createFileError(const Twine &F, ErrorSuccess) = delete;
1334 
1335/// Helper for check-and-exit error handling.
1336///
1337/// For tool use only. NOT FOR USE IN LIBRARY CODE.
1338///
1339class ExitOnError {
1340public:
1341  /// Create an error on exit helper.
1342  ExitOnError(std::string Banner = "", int DefaultErrorExitCode = 1)
1343      : Banner(std::move(Banner)),
1344        GetExitCode([=](const Error &) { return DefaultErrorExitCode; }) {}
1345 
1346  /// Set the banner string for any errors caught by operator().
1347  void setBanner(std::string Banner) { this->Banner = std::move(Banner); }
1348 
1349  /// Set the exit-code mapper function.
1350  void setExitCodeMapper(std::function<int(const Error &)> GetExitCode) {
1351    this->GetExitCode = std::move(GetExitCode);
1352  }
1353 
1354  /// Check Err. If it's in a failure state log the error(s) and exit.
1355  void operator()(Error Err) const { checkError(std::move(Err)); }
1356 
1357  /// Check E. If it's in a success state then return the contained value. If
1358  /// it's in a failure state log the error(s) and exit.
1359  template <typename T> T operator()(Expected<T> &&E) const {
1360    checkError(E.takeError());
1361    return std::move(*E);
1362  }
1363 
1364  /// Check E. If it's in a success state then return the contained reference. If
1365  /// it's in a failure state log the error(s) and exit.
1366  template <typename T> T& operator()(Expected<T&> &&E) const {
1367    checkError(E.takeError());
1368    return *E;
1369  }
1370 
1371private:
1372  void checkError(Error Err) const {
1373    if (Err) {
1374      int ExitCode = GetExitCode(Err);
1375      logAllUnhandledErrors(std::move(Err), errs(), Banner);
1376      exit(ExitCode);
1377    }
1378  }
1379 
1380  std::string Banner;
1381  std::function<int(const Error &)> GetExitCode;
1382};
1383 
1384/// Conversion from Error to LLVMErrorRef for C error bindings.
1385inline LLVMErrorRef wrap(Error Err) {
1386  return reinterpret_cast<LLVMErrorRef>(Err.takePayload().release());
1387}
1388 
1389/// Conversion from LLVMErrorRef to Error for C error bindings.
1390inline Error unwrap(LLVMErrorRef ErrRef) {
1391  return Error(std::unique_ptr<ErrorInfoBase>(
1392      reinterpret_cast<ErrorInfoBase *>(ErrRef)));
1393}
1394 
1395} // end namespace llvm
1396 
1397#endif // LLVM_SUPPORT_ERROR_H