/build/source/clang/lib/AST/ASTImporter.cpp

Bug Summary

File:	build/source/clang/lib/AST/ASTImporter.cpp
Warning:	line 9351, column 47 Called C++ object pointer is null

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name ASTImporter.cpp -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 -analyzer-config-compatibility-mode=true -mrelocation-model pic -pic-level 2 -mframe-pointer=none -relaxed-aliasing -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -ffunction-sections -fdata-sections -fcoverage-compilation-dir=/build/source/build-llvm -resource-dir /usr/lib/llvm-17/lib/clang/17 -I tools/clang/lib/AST -I /build/source/clang/lib/AST -I /build/source/clang/include -I tools/clang/include -I include -I /build/source/llvm/include -D _DEBUG -D _GLIBCXX_ASSERTIONS -D _GNU_SOURCE -D _LIBCPP_ENABLE_ASSERTIONS -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -D _FORTIFY_SOURCE=2 -D NDEBUG -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/x86_64-linux-gnu/c++/10 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../include/c++/10/backward -internal-isystem /usr/lib/llvm-17/lib/clang/17/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/10/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fmacro-prefix-map=/build/source/build-llvm=build-llvm -fmacro-prefix-map=/build/source/= -fcoverage-prefix-map=/build/source/build-llvm=build-llvm -fcoverage-prefix-map=/build/source/= -O3 -Wno-unused-command-line-argument -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wno-comment -Wno-misleading-indentation -std=c++17 -fdeprecated-macro -fdebug-compilation-dir=/build/source/build-llvm -fdebug-prefix-map=/build/source/build-llvm=build-llvm -fdebug-prefix-map=/build/source/= -fdebug-prefix-map=/build/source/build-llvm=build-llvm -fdebug-prefix-map=/build/source/= -ferror-limit 19 -fvisibility-inlines-hidden -stack-protector 2 -fgnuc-version=4.2.1 -fcolor-diagnostics -vectorize-loops -vectorize-slp -analyzer-output=html -analyzer-config stable-report-filename=true -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2023-05-10-133810-16478-1 -x c++ /build/source/clang/lib/AST/ASTImporter.cpp

/build/source/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/ASTContext.h"
16#include "clang/AST/ASTDiagnostic.h"
17#include "clang/AST/ASTImporterSharedState.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/STLExtras.h"
60#include "llvm/ADT/ScopeExit.h"
61#include "llvm/ADT/SmallVector.h"
62#include "llvm/Support/Casting.h"
63#include "llvm/Support/ErrorHandling.h"
64#include "llvm/Support/MemoryBuffer.h"
65#include <algorithm>
66#include <cassert>
67#include <cstddef>
68#include <memory>
69#include <optional>
70#include <type_traits>
71#include <utility>

73namespace clang {

using llvm::make_error;
using llvm::Error;
using llvm::Expected;
using ExpectedTypePtr = llvm::Expected<const Type *>;
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 ASTImportError::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.")::llvm::llvm_unreachable_internal("Invalid error code.", "clang/lib/AST/ASTImporter.cpp"
, 96);
  return "Invalid error code.";
}

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

std::error_code ASTImportError::convertToErrorCode() const {
  llvm_unreachable("Function not implemented.")::llvm::llvm_unreachable_internal("Function not implemented."
, "clang/lib/AST/ASTImporter.cpp", 103);
}

char ASTImportError::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")::llvm::llvm_unreachable_internal("Bad declaration kind", "clang/lib/AST/ASTImporter.cpp"
, 128);
}

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();
}

/// How to handle import errors that occur when import of a child declaration
/// of a DeclContext fails.
class ChildErrorHandlingStrategy {
  /// This context is imported (in the 'from' domain).
  /// It is nullptr if a non-DeclContext is imported.
  const DeclContext *const FromDC;
  /// Ignore import errors of the children.
  /// If true, the context can be imported successfully if a child
  /// of it failed to import. Otherwise the import errors of the child nodes
  /// are accumulated (joined) into the import error object of the parent.
  /// (Import of a parent can fail in other ways.)
  bool const IgnoreChildErrors;

public:
  ChildErrorHandlingStrategy(const DeclContext *FromDC)
      : FromDC(FromDC), IgnoreChildErrors(!isa<TagDecl>(FromDC)) {}
  ChildErrorHandlingStrategy(const Decl *FromD)
      : FromDC(dyn_cast<DeclContext>(FromD)),
        IgnoreChildErrors(!isa<TagDecl>(FromD)) {}

  /// Process the import result of a child (of the current declaration).
  /// \param ResultErr The import error that can be used as result of
  /// importing the parent. This may be changed by the function.
  /// \param ChildErr Result of importing a child. Can be success or error.
  void handleChildImportResult(Error &ResultErr, Error &&ChildErr) {
    if (ChildErr && !IgnoreChildErrors)
      ResultErr = joinErrors(std::move(ResultErr), std::move(ChildErr));
    else
      consumeError(std::move(ChildErr));
  }

  /// Determine if import failure of a child does not cause import failure of
  /// its parent.
  bool ignoreChildErrorOnParent(Decl *FromChildD) const {
    if (!IgnoreChildErrors || !FromDC)
      return false;
    return FromDC->containsDecl(FromChildD);
  }
};

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>
  [[nodiscard]] Error importInto(ImportT &To, const ImportT &From) {
    return Importer.importInto(To, From);
  }

  // Use this to import pointers of specific type.
  template <typename ImportT>
  [[nodiscard]] Error importInto(ImportT *&To, ImportT *From) {
    auto ToOrErr = Importer.Import(From);
    if (ToOrErr)
      To = cast_or_null<ImportT>(*ToOrErr);
    return ToOrErr.takeError();
  }

  // Call the import function of ASTImporter for a baseclass of type `T` and
  // cast the return value to `T`.
  template <typename T>
  auto import(T *From)
      -> std::conditional_t<std::is_base_of_v<Type, T>, Expected<const T *>,
                            Expected<T *>> {
    auto ToOrErr = Importer.Import(From);
    if (!ToOrErr)
      return ToOrErr.takeError();
    return cast_or_null<T>(*ToOrErr);
  }

  template <typename T>
  auto 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);
4
←
Calling 'ASTImporter::Import'→
  }

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

  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>
  [[nodiscard]] 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>
  [[nodiscard]] 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>
  [[nodiscard]] 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);
    Importer.SharedState->markAsNewDecl(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());
        if (llvm::is_contained(FromLookup, FromNamed))
          ToDC->makeDeclVisibleInContext(ToNamed);
      }
    }
  }

  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 VisitUsingType(const UsingType *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
  VisitSubstTemplateTypeParmPackType(const SubstTemplateTypeParmPackType *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(ArrayRef<TemplateArgument> FromArgs,
                                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);

  Expected<InheritedConstructor>
  ImportInheritedConstructor(const InheritedConstructor &From);

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

  bool IsStructuralMatch(Decl *From, Decl *To, bool Complain = true);
  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 VisitUsingPackDecl(UsingPackDecl *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 VisitShuffleVectorExpr(ShuffleVectorExpr *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);

  // 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)
2
←
Taking false branch→
      return T{};
    Expected<T> MaybeVal = import(From);
3
←
Calling 'ASTNodeImporter::import'→
    if (!MaybeVal) {
      Err = MaybeVal.takeError();
      return T{};
    }
    return *MaybeVal;
  }

  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);
};

744template <typename InContainerTy>
745Error 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();
760}

762template <>
763Error ASTNodeImporter::ImportTemplateArgumentListInfo<TemplateArgumentListInfo>(
  const TemplateArgumentListInfo &From, TemplateArgumentListInfo &Result) {
return ImportTemplateArgumentListInfo(
    From.getLAngleLoc(), From.getRAngleLoc(), From.arguments(), Result);
767}

769template <>
770Error ASTNodeImporter::ImportTemplateArgumentListInfo<
  ASTTemplateArgumentListInfo>(
      const ASTTemplateArgumentListInfo &From,
      TemplateArgumentListInfo &Result) {
return ImportTemplateArgumentListInfo(
    From.LAngleLoc, From.RAngleLoc, From.arguments(), Result);
776}

778Expected<ASTNodeImporter::FunctionTemplateAndArgsTy>
779ASTNodeImporter::ImportFunctionTemplateWithTemplateArgsFromSpecialization(
  FunctionDecl *FromFD) {
assert(FromFD->getTemplatedKind() ==(static_cast <bool> (FromFD->getTemplatedKind() == FunctionDecl
::TK_FunctionTemplateSpecialization) ? void (0) : __assert_fail
 ("FromFD->getTemplatedKind() == FunctionDecl::TK_FunctionTemplateSpecialization"
, "clang/lib/AST/ASTImporter.cpp", 782, __extension__ __PRETTY_FUNCTION__
))
    FunctionDecl::TK_FunctionTemplateSpecialization)(static_cast <bool> (FromFD->getTemplatedKind() == FunctionDecl
::TK_FunctionTemplateSpecialization) ? void (0) : __assert_fail
 ("FromFD->getTemplatedKind() == FunctionDecl::TK_FunctionTemplateSpecialization"
, "clang/lib/AST/ASTImporter.cpp", 782, __extension__ __PRETTY_FUNCTION__
));

FunctionTemplateAndArgsTy Result;

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

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

return Result;
796}

798template <>
799Expected<TemplateParameterList *>
800ASTNodeImporter::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);
826}

828template <>
829Expected<TemplateArgument>
830ASTNodeImporter::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, /*isNullPtr*/ false,
                          From.getIsDefaulted());
}

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, From.getIsDefaulted());
}

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

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

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

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

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

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

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

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

llvm_unreachable("Invalid template argument kind")::llvm::llvm_unreachable_internal("Invalid template argument kind"
, "clang/lib/AST/ASTImporter.cpp", 903);
904}

906template <>
907Expected<TemplateArgumentLoc>
908ASTNodeImporter::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);
945}

947template <>
948Expected<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);
963}

965template <>
966Expected<ASTNodeImporter::Designator>
967ASTNodeImporter::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 DesignatedInitExpr::Designator::CreateFieldDesignator(
      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::CreateArrayDesignator(D.getArrayIndex(),
                                           *ToLBracketLocOrErr,
                                           *ToRBracketLocOrErr);

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

assert(D.isArrayRangeDesignator())(static_cast <bool> (D.isArrayRangeDesignator()) ? void
 (0) : __assert_fail ("D.isArrayRangeDesignator()", "clang/lib/AST/ASTImporter.cpp"
, 1000, __extension__ __PRETTY_FUNCTION__));
return Designator::CreateArrayRangeDesignator(
    D.getArrayIndex(), *ToLBracketLocOrErr, *ToEllipsisLocOrErr,
    *ToRBracketLocOrErr);
1004}

1006template <>
1007Expected<LambdaCapture> ASTNodeImporter::import(const LambdaCapture &From) {
ValueDecl *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);
1028}

1030template <typename T>
1031bool 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();
1044}

1046template <>
1047bool 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();
1055}

1057} // namespace clang

1059//----------------------------------------------------------------------------
1060// Import Types
1061//----------------------------------------------------------------------------

1063using namespace clang;

1065ExpectedType ASTNodeImporter::VisitType(const Type *T) {
Importer.FromDiag(SourceLocation(), diag::err_unsupported_ast_node)
  << T->getTypeClassName();
return make_error<ASTImportError>(ASTImportError::UnsupportedConstruct);
1069}

1071ExpectedType ASTNodeImporter::VisitAtomicType(const AtomicType *T){
ExpectedType UnderlyingTypeOrErr = import(T->getValueType());
if (!UnderlyingTypeOrErr)
  return UnderlyingTypeOrErr.takeError();

return Importer.getToContext().getAtomicType(*UnderlyingTypeOrErr);
1077}

1079ExpectedType ASTNodeImporter::VisitBuiltinType(const BuiltinType *T) {
switch (T->getKind()) {
1081#define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
case BuiltinType::Id: \
  return Importer.getToContext().SingletonId;
1084#include "clang/Basic/OpenCLImageTypes.def"
1085#define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
case BuiltinType::Id: \
  return Importer.getToContext().Id##Ty;
1088#include "clang/Basic/OpenCLExtensionTypes.def"
1089#define SVE_TYPE(Name, Id, SingletonId) \
case BuiltinType::Id: \
  return Importer.getToContext().SingletonId;
1092#include "clang/Basic/AArch64SVEACLETypes.def"
1093#define PPC_VECTOR_TYPE(Name, Id, Size) \
case BuiltinType::Id: \
  return Importer.getToContext().Id##Ty;
1096#include "clang/Basic/PPCTypes.def"
1097#define RVV_TYPE(Name, Id, SingletonId)                                        \
case BuiltinType::Id:                                                        \
  return Importer.getToContext().SingletonId;
1100#include "clang/Basic/RISCVVTypes.def"
1101#define WASM_TYPE(Name, Id, SingletonId)                                       \
case BuiltinType::Id:                                                        \
  return Importer.getToContext().SingletonId;
1104#include "clang/Basic/WebAssemblyReferenceTypes.def"
1105#define SHARED_SINGLETON_TYPE(Expansion)
1106#define BUILTIN_TYPE(Id, SingletonId) \
case BuiltinType::Id: return Importer.getToContext().SingletonId;
1108#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!")::llvm::llvm_unreachable_internal("Invalid BuiltinType Kind!"
, "clang/lib/AST/ASTImporter.cpp", 1141);
1142}

1144ExpectedType ASTNodeImporter::VisitDecayedType(const DecayedType *T) {
ExpectedType ToOriginalTypeOrErr = import(T->getOriginalType());
if (!ToOriginalTypeOrErr)
  return ToOriginalTypeOrErr.takeError();

return Importer.getToContext().getDecayedType(*ToOriginalTypeOrErr);
1150}

1152ExpectedType ASTNodeImporter::VisitComplexType(const ComplexType *T) {
ExpectedType ToElementTypeOrErr = import(T->getElementType());
if (!ToElementTypeOrErr)
  return ToElementTypeOrErr.takeError();

return Importer.getToContext().getComplexType(*ToElementTypeOrErr);
1158}

1160ExpectedType ASTNodeImporter::VisitPointerType(const PointerType *T) {
ExpectedType ToPointeeTypeOrErr = import(T->getPointeeType());
if (!ToPointeeTypeOrErr)
  return ToPointeeTypeOrErr.takeError();

return Importer.getToContext().getPointerType(*ToPointeeTypeOrErr);
1166}

1168ExpectedType 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);
1175}

1177ExpectedType
1178ASTNodeImporter::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);
1185}

1187ExpectedType
1188ASTNodeImporter::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);
1195}

1197ExpectedType
1198ASTNodeImporter::VisitMemberPointerType(const MemberPointerType *T) {
// FIXME: Check for C++ support in "to" context.
ExpectedType ToPointeeTypeOrErr = import(T->getPointeeType());
if (!ToPointeeTypeOrErr)
  return ToPointeeTypeOrErr.takeError();

ExpectedTypePtr ClassTypeOrErr = import(T->getClass());
if (!ClassTypeOrErr)
  return ClassTypeOrErr.takeError();

return Importer.getToContext().getMemberPointerType(*ToPointeeTypeOrErr,
                                                    *ClassTypeOrErr);
1210}

1212ExpectedType
1213ASTNodeImporter::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());
1223}

1225ExpectedType
1226ASTNodeImporter::VisitIncompleteArrayType(const IncompleteArrayType *T) {
ExpectedType ToElementTypeOrErr = import(T->getElementType());
if (!ToElementTypeOrErr)
  return ToElementTypeOrErr.takeError();

return Importer.getToContext().getIncompleteArrayType(*ToElementTypeOrErr,
                                                      T->getSizeModifier(),
                                              T->getIndexTypeCVRQualifiers());
1234}

1236ExpectedType
1237ASTNodeImporter::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);
1247}

1249ExpectedType 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);
1263}

1265ExpectedType ASTNodeImporter::VisitVectorType(const VectorType *T) {
ExpectedType ToElementTypeOrErr = import(T->getElementType());
if (!ToElementTypeOrErr)
  return ToElementTypeOrErr.takeError();

return Importer.getToContext().getVectorType(*ToElementTypeOrErr,
                                             T->getNumElements(),
                                             T->getVectorKind());
1273}

1275ExpectedType ASTNodeImporter::VisitExtVectorType(const ExtVectorType *T) {
ExpectedType ToElementTypeOrErr = import(T->getElementType());
if (!ToElementTypeOrErr)
  return ToElementTypeOrErr.takeError();

return Importer.getToContext().getExtVectorType(*ToElementTypeOrErr,
                                                T->getNumElements());
1282}

1284ExpectedType
1285ASTNodeImporter::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());
1294}

1296ExpectedType
1297ASTNodeImporter::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);
1342}

1344ExpectedType 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));
1354}

1356ExpectedType ASTNodeImporter::VisitParenType(const ParenType *T) {
ExpectedType ToInnerTypeOrErr = import(T->getInnerType());
if (!ToInnerTypeOrErr)
  return ToInnerTypeOrErr.takeError();

return Importer.getToContext().getParenType(*ToInnerTypeOrErr);
1362}

1364ExpectedType ASTNodeImporter::VisitTypedefType(const TypedefType *T) {
Expected<TypedefNameDecl *> ToDeclOrErr = import(T->getDecl());
if (!ToDeclOrErr)
  return ToDeclOrErr.takeError();

TypedefNameDecl *ToDecl = *ToDeclOrErr;
if (ToDecl->getTypeForDecl())
  return QualType(ToDecl->getTypeForDecl(), 0);

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

return Importer.getToContext().getTypedefType(ToDecl, *ToUnderlyingTypeOrErr);
1378}

1380ExpectedType ASTNodeImporter::VisitTypeOfExprType(const TypeOfExprType *T) {
ExpectedExpr ToExprOrErr = import(T->getUnderlyingExpr());
if (!ToExprOrErr)
  return ToExprOrErr.takeError();
return Importer.getToContext().getTypeOfExprType(*ToExprOrErr, T->getKind());
1385}

1387ExpectedType ASTNodeImporter::VisitTypeOfType(const TypeOfType *T) {
ExpectedType ToUnderlyingTypeOrErr = import(T->getUnmodifiedType());
if (!ToUnderlyingTypeOrErr)
  return ToUnderlyingTypeOrErr.takeError();
return Importer.getToContext().getTypeOfType(*ToUnderlyingTypeOrErr,
                                             T->getKind());
1393}

1395ExpectedType ASTNodeImporter::VisitUsingType(const UsingType *T) {
Expected<UsingShadowDecl *> FoundOrErr = import(T->getFoundDecl());
if (!FoundOrErr)
  return FoundOrErr.takeError();
Expected<QualType> UnderlyingOrErr = import(T->getUnderlyingType());
if (!UnderlyingOrErr)
  return UnderlyingOrErr.takeError();

return Importer.getToContext().getUsingType(*FoundOrErr, *UnderlyingOrErr);
1404}

1406ExpectedType 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);
1418}

1420ExpectedType
1421ASTNodeImporter::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());
1432}

1434ExpectedType 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;
if (Error Err = ImportTemplateArguments(T->getTypeConstraintArguments(),
                                        ToTemplateArgs))
  return std::move(Err);

return Importer.getToContext().getAutoType(
    *ToDeducedTypeOrErr, T->getKeyword(), /*IsDependent*/false,
    /*IsPack=*/false, cast_or_null<ConceptDecl>(*ToTypeConstraintConcept),
    ToTemplateArgs);
1453}

1455ExpectedType 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());
1467}

1469ExpectedType ASTNodeImporter::VisitInjectedClassNameType(
  const InjectedClassNameType *T) {
Expected<CXXRecordDecl *> ToDeclOrErr = import(T->getDecl());
if (!ToDeclOrErr)
  return ToDeclOrErr.takeError();

// The InjectedClassNameType is created in VisitRecordDecl when the
// T->getDecl() is imported. Here we can return the existing type.
const Type *Ty = (*ToDeclOrErr)->getTypeForDecl();
assert(Ty && isa<InjectedClassNameType>(Ty))(static_cast <bool> (Ty && isa<InjectedClassNameType
>(Ty)) ? void (0) : __assert_fail ("Ty && isa<InjectedClassNameType>(Ty)"
, "clang/lib/AST/ASTImporter.cpp", 1478, __extension__ __PRETTY_FUNCTION__
));
return QualType(Ty, 0);
1480}

1482ExpectedType ASTNodeImporter::VisitRecordType(const RecordType *T) {
Expected<RecordDecl *> ToDeclOrErr = import(T->getDecl());
if (!ToDeclOrErr)
  return ToDeclOrErr.takeError();

return Importer.getToContext().getTagDeclType(*ToDeclOrErr);
1488}

1490ExpectedType ASTNodeImporter::VisitEnumType(const EnumType *T) {
Expected<EnumDecl *> ToDeclOrErr = import(T->getDecl());
if (!ToDeclOrErr)
  return ToDeclOrErr.takeError();

return Importer.getToContext().getTagDeclType(*ToDeclOrErr);
1496}

1498ExpectedType 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);
1508}

1510ExpectedType 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);
1518}

1520ExpectedType ASTNodeImporter::VisitSubstTemplateTypeParmType(
  const SubstTemplateTypeParmType *T) {
Expected<Decl *> ReplacedOrErr = import(T->getAssociatedDecl());
if (!ReplacedOrErr)
  return ReplacedOrErr.takeError();

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

return Importer.getToContext().getSubstTemplateTypeParmType(
    *ToReplacementTypeOrErr, *ReplacedOrErr, T->getIndex(),
    T->getPackIndex());
1533}

1535ExpectedType ASTNodeImporter::VisitSubstTemplateTypeParmPackType(
  const SubstTemplateTypeParmPackType *T) {
Expected<Decl *> ReplacedOrErr = import(T->getAssociatedDecl());
if (!ReplacedOrErr)
  return ReplacedOrErr.takeError();

Expected<TemplateArgument> ToArgumentPack = import(T->getArgumentPack());
if (!ToArgumentPack)
  return ToArgumentPack.takeError();

return Importer.getToContext().getSubstTemplateTypeParmPackType(
    *ReplacedOrErr, T->getIndex(), T->getFinal(), *ToArgumentPack);
1547}

1549ExpectedType ASTNodeImporter::VisitTemplateSpecializationType(
                                     const TemplateSpecializationType *T) {
auto ToTemplateOrErr = import(T->getTemplateName());
if (!ToTemplateOrErr)
  return ToTemplateOrErr.takeError();

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

QualType ToCanonType;
if (!T->isCanonicalUnqualified()) {
  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);
1572}

1574ExpectedType 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);
1592}

1594ExpectedType
1595ASTNodeImporter::VisitPackExpansionType(const PackExpansionType *T) {
ExpectedType ToPatternOrErr = import(T->getPattern());
if (!ToPatternOrErr)
  return ToPatternOrErr.takeError();

return Importer.getToContext().getPackExpansionType(*ToPatternOrErr,
                                                    T->getNumExpansions(),
                                                    /*ExpactPack=*/false);
1603}

1605ExpectedType 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->template_arguments().size());
if (Error Err = ImportTemplateArguments(T->template_arguments(), ToPack))
  return std::move(Err);

return Importer.getToContext().getDependentTemplateSpecializationType(
    T->getKeyword(), *ToQualifierOrErr, ToName, ToPack);
1620}

1622ExpectedType
1623ASTNodeImporter::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);
1641}

1643ExpectedType
1644ASTNodeImporter::VisitObjCInterfaceType(const ObjCInterfaceType *T) {
Expected<ObjCInterfaceDecl *> ToDeclOrErr = import(T->getDecl());
if (!ToDeclOrErr)
  return ToDeclOrErr.takeError();

return Importer.getToContext().getObjCInterfaceType(*ToDeclOrErr);
1650}

1652ExpectedType 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());
1677}

1679ExpectedType
1680ASTNodeImporter::VisitObjCObjectPointerType(const ObjCObjectPointerType *T) {
ExpectedType ToPointeeTypeOrErr = import(T->getPointeeType());
if (!ToPointeeTypeOrErr)
  return ToPointeeTypeOrErr.takeError();

return Importer.getToContext().getObjCObjectPointerType(*ToPointeeTypeOrErr);
1686}

1688//----------------------------------------------------------------------------
1689// Import Declarations
1690//----------------------------------------------------------------------------
1691Error 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<ASTImportError>(ASTImportError::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();
1740}

1742Error 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();
1759}

1761Error 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();
1791}

1793Error
1794ASTNodeImporter::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.")::llvm::llvm_unreachable_internal("Unknown name kind.", "clang/lib/AST/ASTImporter.cpp"
, 1831);
1832}

1834Error
1835ASTNodeImporter::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.
ChildErrorHandlingStrategy HandleChildErrors(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 definition.
      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);
          HandleChildErrors.handleChildImportResult(ChildErrors,
                                                    std::move(Err));
        }
      }
    }
  } else {
    HandleChildErrors.handleChildImportResult(ChildErrors,
                                              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")(static_cast <bool> (D && "DC contains a null decl"
) ? void (0) : __assert_fail ("D && \"DC contains a null decl\""
, "clang/lib/AST/ASTImporter.cpp", 1939, __extension__ __PRETTY_FUNCTION__
));
    Decl *ToD = Importer.GetAlreadyImportedOrNull(D);
    // Remove only the decls which we successfully imported.
    if (ToD) {
      assert(ToDC == ToD->getLexicalDeclContext() && ToDC->containsDecl(ToD))(static_cast <bool> (ToDC == ToD->getLexicalDeclContext
() && ToDC->containsDecl(ToD)) ? void (0) : __assert_fail
 ("ToDC == ToD->getLexicalDeclContext() && ToDC->containsDecl(ToD)"
, "clang/lib/AST/ASTImporter.cpp", 1943, __extension__ __PRETTY_FUNCTION__
));
      // 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;
1955}

1957Error 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();
1974}

1976Error ASTNodeImporter::ImportImplicitMethods(
  const CXXRecordDecl *From, CXXRecordDecl *To) {
assert(From->isCompleteDefinition() && To->getDefinition() == To &&(static_cast <bool> (From->isCompleteDefinition() &&
 To->getDefinition() == To && "Import implicit methods to or from non-definition"
) ? void (0) : __assert_fail ("From->isCompleteDefinition() && To->getDefinition() == To && \"Import implicit methods to or from non-definition\""
, "clang/lib/AST/ASTImporter.cpp", 1979, __extension__ __PRETTY_FUNCTION__
))
    "Import implicit methods to or from non-definition")(static_cast <bool> (From->isCompleteDefinition() &&
 To->getDefinition() == To && "Import implicit methods to or from non-definition"
) ? void (0) : __assert_fail ("From->isCompleteDefinition() && To->getDefinition() == To && \"Import implicit methods to or from non-definition\""
, "clang/lib/AST/ASTImporter.cpp", 1979, __extension__ __PRETTY_FUNCTION__
));

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

return Error::success();
1989}

1991static 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();
2000}

2002Error 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();
// Set the definition to complete even if it is really not complete during
// import. Some AST constructs (expressions) require the record layout
// to be calculated (see 'clang::computeDependence') at the time they are
// constructed. Import of such AST node is possible during import of the
// same record, there is no way to have a completely defined record (all
// fields imported) at that time without multiple AST import passes.
if (!Importer.isMinimalImport())
  To->setCompleteDefinition(true);
// 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();
2125}

2127Error 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();
2149}

2151Error 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();
2183}

2185Error ASTNodeImporter::ImportTemplateArguments(
  ArrayRef<TemplateArgument> FromArgs,
  SmallVectorImpl<TemplateArgument> &ToArgs) {
for (const auto &Arg : FromArgs) {
  if (auto ToOrErr = import(Arg))
    ToArgs.push_back(*ToOrErr);
  else
    return ToOrErr.takeError();
}

return Error::success();
2196}

2198// FIXME: Do not forget to remove this and use only 'import'.
2199Expected<TemplateArgument>
2200ASTNodeImporter::ImportTemplateArgument(const TemplateArgument &From) {
return import(From);
2202}

2204template <typename InContainerTy>
2205Error 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();
2214}

2216static StructuralEquivalenceKind
2217getStructuralEquivalenceKind(const ASTImporter &Importer) {
return Importer.isMinimalImport() ? StructuralEquivalenceKind::Minimal
                                  : StructuralEquivalenceKind::Default;
2220}

2222bool ASTNodeImporter::IsStructuralMatch(Decl *From, Decl *To, 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(To);
if (ToOrigin) {
  To = ToOrigin;
}

StructuralEquivalenceContext Ctx(
    Importer.getFromContext(), Importer.getToContext(),
    Importer.getNonEquivalentDecls(), getStructuralEquivalenceKind(Importer),
    false, Complain);
return Ctx.IsEquivalent(From, To);
2235}

2237ExpectedDecl ASTNodeImporter::VisitDecl(Decl *D) {
Importer.FromDiag(D->getLocation(), diag::err_unsupported_ast_node)
  << D->getDeclKindName();
return make_error<ASTImportError>(ASTImportError::UnsupportedConstruct);
2241}

2243ExpectedDecl ASTNodeImporter::VisitImportDecl(ImportDecl *D) {
Importer.FromDiag(D->getLocation(), diag::err_unsupported_ast_node)
    << D->getDeclKindName();
return make_error<ASTImportError>(ASTImportError::UnsupportedConstruct);
2247}

2249ExpectedDecl 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;
2267}

2269ExpectedDecl ASTNodeImporter::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
TranslationUnitDecl *ToD =
  Importer.getToContext().getTranslationUnitDecl();

Importer.MapImported(D, ToD);

return ToD;
2276}

2278ExpectedDecl 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;
2305}

2307ExpectedDecl 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;
2332}

2334ExpectedDecl 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;
2358}

2360ExpectedDecl 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, D->isNested()))
    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;
2441}

2443ExpectedDecl 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;
2477}

2479ExpectedDecl
2480ASTNodeImporter::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 underlying declarations are unnamed records these can be
        // imported as different types. We should create a distinct typedef
        // node in this case.
        // If we found an existing underlying type with a record in a
        // different context (than the imported), this is already reason for
        // having distinct typedef nodes for these.
        // Again this can create situation like
        // 'typedef int T; typedef int T;' but this is hard to avoid without
        // a rename strategy at import.
        if (!FromUT.isNull() && !FoundUT.isNull()) {
          RecordDecl *FromR = FromUT->getAsRecordDecl();
          RecordDecl *FoundR = FoundUT->getAsRecordDecl();
          if (FromR && FoundR &&
              !hasSameVisibilityContextAndLinkage(FoundR, FromR))
            continue;
        }
        // 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;
2593}

2595ExpectedDecl ASTNodeImporter::VisitTypedefDecl(TypedefDecl *D) {
return VisitTypedefNameDecl(D, /*IsAlias=*/false);
2597}

2599ExpectedDecl ASTNodeImporter::VisitTypeAliasDecl(TypeAliasDecl *D) {
return VisitTypedefNameDecl(D, /*IsAlias=*/true);
2601}

2603ExpectedDecl
2604ASTNodeImporter::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;
2659}

2661ExpectedDecl 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())(static_cast <bool> (LexicalDC->isFunctionOrMethod()
) ? void (0) : __assert_fail ("LexicalDC->isFunctionOrMethod()"
, "clang/lib/AST/ASTImporter.cpp", 2672, __extension__ __PRETTY_FUNCTION__
));

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;
2698}

2700ExpectedDecl 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;
2804}

2806ExpectedDecl 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")(static_cast <bool> (FoundCXX && "Record type mismatch"
) ? void (0) : __assert_fail ("FoundCXX && \"Record type mismatch\""
, "clang/lib/AST/ASTImporter.cpp", 2884, __extension__ __PRETTY_FUNCTION__
));

            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->getLambdaDependencyKind(),
            DCXX->isGenericLambda(), DCXX->getLambdaCaptureDefault()))
      return D2CXX;
    CXXRecordDecl::LambdaNumbering Numbering = DCXX->getLambdaNumbering();
    ExpectedDecl CDeclOrErr = import(Numbering.ContextDecl);
    if (!CDeclOrErr)
      return CDeclOrErr.takeError();
    Numbering.ContextDecl = *CDeclOrErr;
    D2CXX->setLambdaNumbering(Numbering);
 } 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).
      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.
      // The chain may contain an already existing injected type at the start,
      // if yes this should be reused. We must ensure that only one type
      // object exists for the injected type (including the injected record
      // declaration), ASTContext does not check it.
      SmallVector<Decl *, 2> Redecls =
          getCanonicalForwardRedeclChain(D2CXX);
      const Type *FrontTy =
          cast<CXXRecordDecl>(Redecls.front())->getTypeForDecl();
      QualType InjSpec;
      if (auto *InjTy = FrontTy->getAs<InjectedClassNameType>())
        InjSpec = InjTy->getInjectedSpecializationType();
      else
        InjSpec = ToDescribed->getInjectedClassNameSpecialization();
      for (auto *R : Redecls) {
        auto *RI = cast<CXXRecordDecl>(R);
        if (R != Redecls.front() ||
            !isa<InjectedClassNameType>(RI->getTypeForDecl()))
          RI->setTypeForDecl(nullptr);
        // This function tries to get the injected type from getTypeForDecl,
        // then from the previous declaration if possible. If not, it creates
        // a new type.
        Importer.getToContext().getInjectedClassNameType(RI, InjSpec);
      }
      // Set the new type for the injected decl too.
      if (Injected) {
        Injected->setTypeForDecl(nullptr);
        // This function will copy the injected type from D2CXX into Injected.
        // The injected decl does not have a previous decl to copy from.
        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;
3054}

3056ExpectedDecl 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;
3112}

3114Error 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();
3128}

3130Error ASTNodeImporter::ImportTemplateInformation(
  FunctionDecl *FromFD, FunctionDecl *ToFD) {
switch (FromFD->getTemplatedKind()) {
case FunctionDecl::TK_NonTemplate:
case FunctionDecl::TK_FunctionTemplate:
  return Error::success();

case FunctionDecl::TK_DependentNonTemplate:
  if (Expected<FunctionDecl *> InstFDOrErr =
          import(FromFD->getInstantiatedFromDecl()))
    ToFD->setInstantiatedFromDecl(*InstFDOrErr);
  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::ArrayRef(FromInfo->getTemplateArgs(),
                         FromInfo->getNumTemplateArgs()),
          ToTAInfo))
    return Err;

  ToFD->setDependentTemplateSpecialization(Importer.getToContext(),
                                           TemplDecls, ToTAInfo);
  return Error::success();
}
}
llvm_unreachable("All cases should be covered!")::llvm::llvm_unreachable_internal("All cases should be covered!"
, "clang/lib/AST/ASTImporter.cpp", 3217);
3218}

3220Expected<FunctionDecl *>
3221ASTNodeImporter::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;
3233}

3235Error 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();
3244}

3246// Returns true if the given D has a DeclContext up to the TranslationUnitDecl
3247// which is equal to the given DC, or D is equal to DC.
3248static bool isAncestorDeclContextOf(const DeclContext *DC, const Decl *D) {
const DeclContext *DCi = dyn_cast<DeclContext>(D);
if (!DCi)
  DCi = D->getDeclContext();
assert(DCi && "Declaration should have a context")(static_cast <bool> (DCi && "Declaration should have a context"
) ? void (0) : __assert_fail ("DCi && \"Declaration should have a context\""
, "clang/lib/AST/ASTImporter.cpp", 3252, __extension__ __PRETTY_FUNCTION__
));
while (DCi != D->getTranslationUnitDecl()) {
  if (DCi == DC)
    return true;
  DCi = DCi->getParent();
}
return false;
3259}

3261// Check if there is a declaration that has 'DC' as parent context and is
3262// referenced from statement 'S' or one of its children. The search is done in
3263// BFS order through children of 'S'.
3264static bool isAncestorDeclContextOf(const DeclContext *DC, const Stmt *S) {
SmallVector<const Stmt *> ToProcess;
ToProcess.push_back(S);
while (!ToProcess.empty()) {
  const Stmt *CurrentS = ToProcess.pop_back_val();
  ToProcess.append(CurrentS->child_begin(), CurrentS->child_end());
  if (const auto *DeclRef = dyn_cast<DeclRefExpr>(CurrentS))
    if (const Decl *D = DeclRef->getDecl())
      if (isAncestorDeclContextOf(DC, D))
        return true;
}
return false;
3276}

3278namespace {
3279/// Check if a type has any reference to a declaration that is inside the body
3280/// of a function.
3281/// The \c CheckType(QualType) function should be used to determine
3282/// this property.
3283///
3284/// The type visitor visits one type object only (not recursive).
3285/// To find all referenced declarations we must discover all type objects until
3286/// the canonical type is reached (walk over typedef and similar objects). This
3287/// is done by loop over all "sugar" type objects. For every such type we must
3288/// check all declarations that are referenced from it. For this check the
3289/// visitor is used. In the visit functions all referenced declarations except
3290/// the one that follows in the sugar chain (if any) must be checked. For this
3291/// check the same visitor is re-used (it has no state-dependent data).
3292///
3293/// The visit functions have 3 possible return values:
3294///  - True, found a declaration inside \c ParentDC.
3295///  - False, found declarations only outside \c ParentDC and it is not possible
3296///    to find more declarations (the "sugar" chain does not continue).
3297///  - Empty optional value, found no declarations or only outside \c ParentDC,
3298///    but it is possible to find more declarations in the type "sugar" chain.
3299/// The loop over the "sugar" types can be implemented by using type visit
3300/// functions only (call \c CheckType with the desugared type). With the current
3301/// solution no visit function is needed if the type has only a desugared type
3302/// as data.
3303class IsTypeDeclaredInsideVisitor
  : public TypeVisitor<IsTypeDeclaredInsideVisitor, std::optional<bool>> {
3305public:
IsTypeDeclaredInsideVisitor(const FunctionDecl *ParentDC)
    : ParentDC(ParentDC) {}

bool CheckType(QualType T) {
  // Check the chain of "sugar" types.
  // The "sugar" types are typedef or similar types that have the same
  // canonical type.
  if (std::optional<bool> Res = Visit(T.getTypePtr()))
    return *Res;
  QualType DsT =
      T.getSingleStepDesugaredType(ParentDC->getParentASTContext());
  while (DsT != T) {
    if (std::optional<bool> Res = Visit(DsT.getTypePtr()))
      return *Res;
    T = DsT;
    DsT = T.getSingleStepDesugaredType(ParentDC->getParentASTContext());
  }
  return false;
}

std::optional<bool> VisitTagType(const TagType *T) {
  if (auto *Spec = dyn_cast<ClassTemplateSpecializationDecl>(T->getDecl()))
    for (const auto &Arg : Spec->getTemplateArgs().asArray())
      if (checkTemplateArgument(Arg))
        return true;
  return isAncestorDeclContextOf(ParentDC, T->getDecl());
}

std::optional<bool> VisitPointerType(const PointerType *T) {
  return CheckType(T->getPointeeType());
}

std::optional<bool> VisitReferenceType(const ReferenceType *T) {
  return CheckType(T->getPointeeTypeAsWritten());
}

std::optional<bool> VisitTypedefType(const TypedefType *T) {
  const TypedefNameDecl *TD = T->getDecl();
  assert(TD)(static_cast <bool> (TD) ? void (0) : __assert_fail ("TD"
, "clang/lib/AST/ASTImporter.cpp", 3344, __extension__ __PRETTY_FUNCTION__
));
  return isAncestorDeclContextOf(ParentDC, TD);
}

std::optional<bool> VisitUsingType(const UsingType *T) {
  if (T->getFoundDecl() &&
      isAncestorDeclContextOf(ParentDC, T->getFoundDecl()))
    return true;

  return {};
}

std::optional<bool>
VisitTemplateSpecializationType(const TemplateSpecializationType *T) {
  for (const auto &Arg : T->template_arguments())
    if (checkTemplateArgument(Arg))
      return true;
  // This type is a "sugar" to a record type, it can have a desugared type.
  return {};
}

std::optional<bool> VisitConstantArrayType(const ConstantArrayType *T) {
  if (T->getSizeExpr() && isAncestorDeclContextOf(ParentDC, T->getSizeExpr()))
    return true;

  return CheckType(T->getElementType());
}

std::optional<bool> VisitVariableArrayType(const VariableArrayType *T) {
  llvm_unreachable(::llvm::llvm_unreachable_internal("Variable array should not occur in deduced return type of a function"
, "clang/lib/AST/ASTImporter.cpp", 3374)
      "Variable array should not occur in deduced return type of a function")::llvm::llvm_unreachable_internal("Variable array should not occur in deduced return type of a function"
, "clang/lib/AST/ASTImporter.cpp", 3374);
}

std::optional<bool> VisitIncompleteArrayType(const IncompleteArrayType *T) {
  llvm_unreachable("Incomplete array should not occur in deduced return type "::llvm::llvm_unreachable_internal("Incomplete array should not occur in deduced return type "
 "of a function", "clang/lib/AST/ASTImporter.cpp", 3379)
                   "of a function")::llvm::llvm_unreachable_internal("Incomplete array should not occur in deduced return type "
 "of a function", "clang/lib/AST/ASTImporter.cpp", 3379);
}

std::optional<bool> VisitDependentArrayType(const IncompleteArrayType *T) {
  llvm_unreachable("Dependent array should not occur in deduced return type "::llvm::llvm_unreachable_internal("Dependent array should not occur in deduced return type "
 "of a function", "clang/lib/AST/ASTImporter.cpp", 3384)
                   "of a function")::llvm::llvm_unreachable_internal("Dependent array should not occur in deduced return type "
 "of a function", "clang/lib/AST/ASTImporter.cpp", 3384);
}

3387private:
const DeclContext *const ParentDC;

bool checkTemplateArgument(const TemplateArgument &Arg) {
  switch (Arg.getKind()) {
  case TemplateArgument::Null:
    return false;
  case TemplateArgument::Integral:
    return CheckType(Arg.getIntegralType());
  case TemplateArgument::Type:
    return CheckType(Arg.getAsType());
  case TemplateArgument::Expression:
    return isAncestorDeclContextOf(ParentDC, Arg.getAsExpr());
  case TemplateArgument::Declaration:
    // FIXME: The declaration in this case is not allowed to be in a function?
    return isAncestorDeclContextOf(ParentDC, Arg.getAsDecl());
  case TemplateArgument::NullPtr:
    // FIXME: The type is not allowed to be in the function?
    return CheckType(Arg.getNullPtrType());
  case TemplateArgument::Pack:
    for (const auto &PackArg : Arg.getPackAsArray())
      if (checkTemplateArgument(PackArg))
        return true;
    return false;
  case TemplateArgument::Template:
    // Templates can not be defined locally in functions.
    // A template passed as argument can be not in ParentDC.
    return false;
  case TemplateArgument::TemplateExpansion:
    // Templates can not be defined locally in functions.
    // A template passed as argument can be not in ParentDC.
    return false;
  }
  llvm_unreachable("Unknown TemplateArgument::ArgKind enum")::llvm::llvm_unreachable_internal("Unknown TemplateArgument::ArgKind enum"
, "clang/lib/AST/ASTImporter.cpp", 3420);
};
3422};
3423} // namespace

3425bool ASTNodeImporter::hasAutoReturnTypeDeclaredInside(FunctionDecl *D) {
QualType FromTy = D->getType();
const auto *FromFPT = FromTy->getAs<FunctionProtoType>();
assert(FromFPT && "Must be called on FunctionProtoType")(static_cast <bool> (FromFPT && "Must be called on FunctionProtoType"
) ? void (0) : __assert_fail ("FromFPT && \"Must be called on FunctionProtoType\""
, "clang/lib/AST/ASTImporter.cpp", 3428, __extension__ __PRETTY_FUNCTION__
));

QualType RetT = FromFPT->getReturnType();
if (isa<AutoType>(RetT.getTypePtr())) {
  FunctionDecl *Def = D->getDefinition();
  IsTypeDeclaredInsideVisitor Visitor(Def ? Def : D);
  return Visitor.CheckType(RetT);
}

return false;
3438}

3440ExplicitSpecifier
3441ASTNodeImporter::importExplicitSpecifier(Error &Err, ExplicitSpecifier ESpec) {
Expr *ExplicitExpr = ESpec.getExpr();
if (ExplicitExpr)
  ExplicitExpr = importChecked(Err, ESpec.getExpr());
return ExplicitSpecifier(ExplicitExpr, ESpec.getKind());
3446}

3448ExpectedDecl 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)(static_cast <bool> (*RedeclIt == D) ? void (0) : __assert_fail
 ("*RedeclIt == D", "clang/lib/AST/ASTImporter.cpp", 3459, __extension__
 __PRETTY_FUNCTION__));

// 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() &&(static_cast <bool> (FoundByLookup->getDescribedFunctionTemplate
() && "Templated function mapped to non-templated?") ?
 void (0) : __assert_fail ("FoundByLookup->getDescribedFunctionTemplate() && \"Templated function mapped to non-templated?\""
, "clang/lib/AST/ASTImporter.cpp", 3552, __extension__ __PRETTY_FUNCTION__
))
                 "Templated function mapped to non-templated?")(static_cast <bool> (FoundByLookup->getDescribedFunctionTemplate
() && "Templated function mapped to non-templated?") ?
 void (0) : __assert_fail ("FoundByLookup->getDescribedFunctionTemplate() && \"Templated function mapped to non-templated?\""
, "clang/lib/AST/ASTImporter.cpp", 3552, __extension__ __PRETTY_FUNCTION__
));
          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();
TypeSourceInfo *FromTSI = D->getTypeSourceInfo();
// 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.
// The type is related to TypeSourceInfo (it references the type), so we must
// do the same with TypeSourceInfo.
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);
  FromTSI = Importer.getFromContext().getTrivialTypeSourceInfo(
      FromTy, D->getBeginLoc());
}

Error Err = Error::success();
auto T = importChecked(Err, FromTy);
auto TInfo = importChecked(Err, FromTSI);
auto ToInnerLocStart = importChecked(Err, D->getInnerLocStart());
auto ToEndLoc = importChecked(Err, D->getEndLoc());
auto ToDefaultLoc = importChecked(Err, D->getDefaultLoc());
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);
  auto ToInheritedConstructor = InheritedConstructor();
  if (FromConstructor->isInheritingConstructor()) {
    Expected<InheritedConstructor> ImportedInheritedCtor =
        import(FromConstructor->getInheritedConstructor());
    if (!ImportedInheritedCtor)
      return ImportedInheritedCtor.takeError();
    ToInheritedConstructor = *ImportedInheritedCtor;
  }
  if (GetImportedOrCreateDecl<CXXConstructorDecl>(
          ToFunction, D, Importer.getToContext(), cast<CXXRecordDecl>(DC),
          ToInnerLocStart, NameInfo, T, TInfo, ESpec, D->UsesFPIntrin(),
          D->isInlineSpecified(), D->isImplicit(), D->getConstexprKind(),
          ToInheritedConstructor, 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->UsesFPIntrin(),
          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->UsesFPIntrin(),
          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->UsesFPIntrin(), 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->UsesFPIntrin(),
          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->setFriendConstraintRefersToEnclosingTemplate(
    D->FriendConstraintRefersToEnclosingTemplate());
ToFunction->setRangeEnd(ToEndLoc);
ToFunction->setDefaultLoc(ToDefaultLoc);

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

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();
  if (Expected<TypeSourceInfo *> TSIOrErr = import(D->getTypeSourceInfo()))
    ToFunction->setTypeSourceInfo(*TSIOrErr);
  else
    return TSIOrErr.takeError();
}

// FIXME: Other bits to merge?

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;
3820}

3822ExpectedDecl ASTNodeImporter::VisitCXXMethodDecl(CXXMethodDecl *D) {
return VisitFunctionDecl(D);
3824}

3826ExpectedDecl ASTNodeImporter::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
return VisitCXXMethodDecl(D);
3828}

3830ExpectedDecl ASTNodeImporter::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
return VisitCXXMethodDecl(D);
3832}

3834ExpectedDecl ASTNodeImporter::VisitCXXConversionDecl(CXXConversionDecl *D) {
return VisitCXXMethodDecl(D);
3836}

3838ExpectedDecl
3839ASTNodeImporter::VisitCXXDeductionGuideDecl(CXXDeductionGuideDecl *D) {
return VisitFunctionDecl(D);
3841}

3843ExpectedDecl 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.
      // Note: `hasInClassInitializer()` is not the same as non-null
      // `getInClassInitializer()` value.
      if (Expr *FromInitializer = D->getInClassInitializer()) {
        if (ExpectedExpr ToInitializerOrErr = import(FromInitializer)) {
          // Import of the FromInitializer may result in the setting of
          // InClassInitializer. If not, set it here.
          assert(FoundField->hasInClassInitializer() &&(static_cast <bool> (FoundField->hasInClassInitializer
() && "Field should have an in-class initializer if it has an "
 "expression for it.") ? void (0) : __assert_fail ("FoundField->hasInClassInitializer() && \"Field should have an in-class initializer if it has an \" \"expression for it.\""
, "clang/lib/AST/ASTImporter.cpp", 3879, __extension__ __PRETTY_FUNCTION__
))
                 "Field should have an in-class initializer if it has an "(static_cast <bool> (FoundField->hasInClassInitializer
() && "Field should have an in-class initializer if it has an "
 "expression for it.") ? void (0) : __assert_fail ("FoundField->hasInClassInitializer() && \"Field should have an in-class initializer if it has an \" \"expression for it.\""
, "clang/lib/AST/ASTImporter.cpp", 3879, __extension__ __PRETTY_FUNCTION__
))
                 "expression for it.")(static_cast <bool> (FoundField->hasInClassInitializer
() && "Field should have an in-class initializer if it has an "
 "expression for it.") ? void (0) : __assert_fail ("FoundField->hasInClassInitializer() && \"Field should have an in-class initializer if it has an \" \"expression for it.\""
, "clang/lib/AST/ASTImporter.cpp", 3879, __extension__ __PRETTY_FUNCTION__
));
          if (!FoundField->getInClassInitializer())
            FoundField->setInClassInitializer(*ToInitializerOrErr);
        } else {
            return ToInitializerOrErr.takeError();
        }
      }
      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<ASTImportError>(ASTImportError::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;

// We need [[no_unqiue_address]] attributes to be added to FieldDecl, before
// we add fields in CXXRecordDecl::addedMember, otherwise record will be
// marked as having non-zero size.
Err = Importer.ImportAttrs(ToField, D);
if (Err)
  return std::move(Err);
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;
3934}

3936ExpectedDecl 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<ASTImportError>(ASTImportError::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;
4004}

4006/// Used as return type of getFriendCountAndPosition.
4007struct FriendCountAndPosition {
/// Number of similar looking friends.
unsigned int TotalCount;
/// Index of the specific FriendDecl.
unsigned int IndexOfDecl;
4012};

4014template <class T>
4015static FriendCountAndPosition getFriendCountAndPosition(
  const FriendDecl *FD,
  llvm::function_ref<T(const FriendDecl *)> GetCanTypeOrDecl) {
unsigned int FriendCount = 0;
std::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.")(static_cast <bool> (FriendPosition && "Friend decl not found in own parent."
) ? void (0) : __assert_fail ("FriendPosition && \"Friend decl not found in own parent.\""
, "clang/lib/AST/ASTImporter.cpp", 4034, __extension__ __PRETTY_FUNCTION__
));

return {FriendCount, *FriendPosition};
4037}

4039static 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.")::llvm::llvm_unreachable_internal("Wrong friend object type."
, "clang/lib/AST/ASTImporter.cpp", 4044);
  });
else
  return getFriendCountAndPosition<Decl *>(FD, [](const FriendDecl *F) {
    if (Decl *D = F->getFriendDecl())
      return D->getCanonicalDecl();
    llvm_unreachable("Wrong friend object type.")::llvm::llvm_unreachable_internal("Wrong friend object type."
, "clang/lib/AST/ASTImporter.cpp", 4050);
  });
4052}

4054ExpectedDecl 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 &&(static_cast <bool> (ImportedEquivalentFriends.size() <=
 CountAndPosition.TotalCount && "Class with non-matching friends is imported, ODR check wrong?"
) ? void (0) : __assert_fail ("ImportedEquivalentFriends.size() <= CountAndPosition.TotalCount && \"Class with non-matching friends is imported, ODR check wrong?\""
, "clang/lib/AST/ASTImporter.cpp", 4086, __extension__ __PRETTY_FUNCTION__
))
       "Class with non-matching friends is imported, ODR check wrong?")(static_cast <bool> (ImportedEquivalentFriends.size() <=
 CountAndPosition.TotalCount && "Class with non-matching friends is imported, ODR check wrong?"
) ? void (0) : __assert_fail ("ImportedEquivalentFriends.size() <= CountAndPosition.TotalCount && \"Class with non-matching friends is imported, ODR check wrong?\""
, "clang/lib/AST/ASTImporter.cpp", 4086, __extension__ __PRETTY_FUNCTION__
));
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;
4137}

4139ExpectedDecl 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<ASTImportError>(ASTImportError::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;
4188}

4190ExpectedDecl 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)(static_cast <bool> (*RedeclIt == D) ? void (0) : __assert_fail
 ("*RedeclIt == D", "clang/lib/AST/ASTImporter.cpp", 4201, __extension__
 __PRETTY_FUNCTION__));

// 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;
4351}

4353ExpectedDecl 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;
4372}

4374Error 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();
4394}

4396Expected<InheritedConstructor>
4397ASTNodeImporter::ImportInheritedConstructor(const InheritedConstructor &From) {
Error Err = Error::success();
CXXConstructorDecl *ToBaseCtor = importChecked(Err, From.getConstructor());
ConstructorUsingShadowDecl *ToShadow =
    importChecked(Err, From.getShadowDecl());
if (Err)
  return std::move(Err);
return InheritedConstructor(ToShadow, ToBaseCtor);
4405}

4407ExpectedDecl 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;
4444}

4446ExpectedDecl 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<ASTImportError>(ASTImportError::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<ASTImportError>(ASTImportError::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<ASTImportError>(ASTImportError::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<ASTImportError>(ASTImportError::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;
4576}

4578ExpectedDecl 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;
4607}

4609ExpectedDecl 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))
  return std::move(Err);
if (ToD)
  return ToD;

ObjCInterfaceDecl *ToInterface;
if (Error Err = importInto(ToInterface, D->getClassInterface()))
  return std::move(Err);

// Determine if we've already encountered this category.
ObjCCategoryDecl *MergeWithCategory
  = ToInterface->FindCategoryDeclaration(Name.getAsIdentifierInfo());
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;
4698}

4700Error 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();
4743}

4745ExpectedDecl 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;
4799}

4801ExpectedDecl 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;
4833}

4835ExpectedDecl 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;
4846}

4848ExpectedDecl 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);
4888}

4890ExpectedDecl 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 ToNameLoc = importChecked(Err, D->getLocation());
auto *ToEnumType = importChecked(Err, D->getEnumType());
if (Err)
  return std::move(Err);

UsingEnumDecl *ToUsingEnum;
if (GetImportedOrCreateDecl(ToUsingEnum, D, Importer.getToContext(), DC,
                            ToUsingLoc, ToEnumLoc, ToNameLoc, ToEnumType))
  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);
4926}

4928ExpectedDecl 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 (auto *FromConstructorUsingShadow =
        dyn_cast<ConstructorUsingShadowDecl>(D)) {
  Error Err = Error::success();
  ConstructorUsingShadowDecl *Nominated = importChecked(
      Err, FromConstructorUsingShadow->getNominatedBaseClassShadowDecl());
  if (Err)
    return std::move(Err);
  // The 'Target' parameter of ConstructorUsingShadowDecl constructor
  // is really the "NominatedBaseClassShadowDecl" value if it exists
  // (see code of ConstructorUsingShadowDecl::ConstructorUsingShadowDecl).
  // We should pass the NominatedBaseClassShadowDecl to it (if non-null) to
  // get the correct values.
  if (GetImportedOrCreateDecl<ConstructorUsingShadowDecl>(
          ToShadow, D, Importer.getToContext(), DC, Loc,
          cast<UsingDecl>(*ToIntroducerOrErr),
          Nominated ? Nominated : *ToTargetOrErr,
          FromConstructorUsingShadow->constructsVirtualBase()))
    return ToShadow;
} else {
  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;
4988}

4990ExpectedDecl 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;
5027}

5029ExpectedDecl ASTNodeImporter::VisitUsingPackDecl(UsingPackDecl *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 ToInstantiatedFromUsingOrErr =
    Importer.Import(D->getInstantiatedFromUsingDecl());
if (!ToInstantiatedFromUsingOrErr)
  return ToInstantiatedFromUsingOrErr.takeError();
SmallVector<NamedDecl *, 4> Expansions(D->expansions().size());
if (Error Err = ImportArrayChecked(D->expansions(), Expansions.begin()))
  return std::move(Err);

UsingPackDecl *ToUsingPack;
if (GetImportedOrCreateDecl(ToUsingPack, D, Importer.getToContext(), DC,
                            cast<NamedDecl>(*ToInstantiatedFromUsingOrErr),
                            Expansions))
  return ToUsingPack;

addDeclToContexts(D, ToUsingPack);

return ToUsingPack;
5056}

5058ExpectedDecl 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;
5092}

5094ExpectedDecl 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;
5124}

5126ExpectedDecl 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!")(static_cast <bool> (ToD && "BuiltinTemplateDecl of unsupported kind!"
) ? void (0) : __assert_fail ("ToD && \"BuiltinTemplateDecl of unsupported kind!\""
, "clang/lib/AST/ASTImporter.cpp", 5136, __extension__ __PRETTY_FUNCTION__
));
Importer.MapImported(D, ToD);
return ToD;
5139}

5141Error 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();
5239}

5241Expected<ObjCTypeParamList *>
5242ASTNodeImporter::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);
5266}

5268ExpectedDecl 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;
5331}

5333ExpectedDecl
5334ASTNodeImporter::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;
5368}

5370ExpectedDecl
5371ASTNodeImporter::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<ASTImportError>(ASTImportError::NameConflict);
  }
}

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

return Impl;
5451}

5453ExpectedDecl 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<ASTImportError>(ASTImportError::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;
5531}

5533ExpectedDecl
5534ASTNodeImporter::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<ASTImportError>(ASTImportError::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<ASTImportError>(ASTImportError::NameConflict);
  }

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

return ToImpl;
5609}

5611ExpectedDecl
5612ASTNodeImporter::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;
5672}

5674ExpectedDecl
5675ASTNodeImporter::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;
5703}

5705ExpectedDecl
5706ASTNodeImporter::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;
5739}

5741// Returns the definition for a (forward) declaration of a TemplateDecl, if
5742// it has any definition in the redecl chain.
5743template <typename T> static auto getTemplateDefinition(T *D) -> T * {
assert(D->getTemplatedDecl() && "Should be called on templates only")(static_cast <bool> (D->getTemplatedDecl() &&
 "Should be called on templates only") ? void (0) : __assert_fail
 ("D->getTemplatedDecl() && \"Should be called on templates only\""
, "clang/lib/AST/ASTImporter.cpp", 5744, __extension__ __PRETTY_FUNCTION__
));
auto *ToTemplatedDef = D->getTemplatedDecl()->getDefinition();
if (!ToTemplatedDef)
  return nullptr;
auto *TemplateWithDef = ToTemplatedDef->getDescribedTemplate();
return cast_or_null<T>(TemplateWithDef);
5750}

5752ExpectedDecl 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() &&(static_cast <bool> (FoundByLookup->getTemplatedDecl
() && "Found decl must have its templated decl set") ?
 void (0) : __assert_fail ("FoundByLookup->getTemplatedDecl() && \"Found decl must have its templated decl set\""
, "clang/lib/AST/ASTImporter.cpp", 5846, __extension__ __PRETTY_FUNCTION__
))
           "Found decl must have its templated decl set")(static_cast <bool> (FoundByLookup->getTemplatedDecl
() && "Found decl must have its templated decl set") ?
 void (0) : __assert_fail ("FoundByLookup->getTemplatedDecl() && \"Found decl must have its templated decl set\""
, "clang/lib/AST/ASTImporter.cpp", 5846, __extension__ __PRETTY_FUNCTION__
));
    CXXRecordDecl *PrevTemplated =
        FoundByLookup->getTemplatedDecl()->getMostRecentDecl();
    if (ToTemplated != PrevTemplated)
      ToTemplated->setPreviousDecl(PrevTemplated);
  }

  D2->setPreviousDecl(Recent);
}

return D2;
5857}

5859ExpectedDecl 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().asArray(), 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<ASTImportError>(ASTImportError::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::ArrayRef(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 (auto P = D->getInstantiatedFrom()) {
  if (auto *CTD = P.dyn_cast<ClassTemplateDecl *>()) {
    if (auto CTDorErr = import(CTD))
      D2->setInstantiationOf(*CTDorErr);
  } else {
    auto *CTPSD = cast<ClassTemplatePartialSpecializationDecl *>(P);
    auto CTPSDOrErr = import(CTPSD);
    if (!CTPSDOrErr)
      return CTPSDOrErr.takeError();
    const TemplateArgumentList &DArgs = D->getTemplateInstantiationArgs();
    SmallVector<TemplateArgument, 2> D2ArgsVec(DArgs.size());
    for (unsigned I = 0; I < DArgs.size(); ++I) {
      const TemplateArgument &DArg = DArgs[I];
      if (auto ArgOrErr = import(DArg))
        D2ArgsVec[I] = *ArgOrErr;
      else
        return ArgOrErr.takeError();
    }
    D2->setInstantiationOf(
        *CTPSDOrErr,
        TemplateArgumentList::CreateCopy(Importer.getToContext(), D2ArgsVec));
  }
}

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

return D2;
6060}

6062ExpectedDecl 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() &&(static_cast <bool> (!DC->isFunctionOrMethod() &&
 "Variable templates cannot be declared at function scope") ?
 void (0) : __assert_fail ("!DC->isFunctionOrMethod() && \"Variable templates cannot be declared at function scope\""
, "clang/lib/AST/ASTImporter.cpp", 6075, __extension__ __PRETTY_FUNCTION__
))
       "Variable templates cannot be declared at function scope")(static_cast <bool> (!DC->isFunctionOrMethod() &&
 "Variable templates cannot be declared at function scope") ?
 void (0) : __assert_fail ("!DC->isFunctionOrMethod() && \"Variable templates cannot be declared at function scope\""
, "clang/lib/AST/ASTImporter.cpp", 6075, __extension__ __PRETTY_FUNCTION__
));

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);
}

return ToVarTD;
6159}

6161ExpectedDecl 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().asArray(), 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 {
  TemplateArgumentListInfo ToTAInfo;
  if (const ASTTemplateArgumentListInfo *Args = D->getTemplateArgsInfo()) {
    if (Error Err = ImportTemplateArgumentListInfo(*Args, 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, QualType(), nullptr,
                                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,
                                QualType(), nullptr, D->getStorageClass(),
                                TemplateArgs))
      return D2;
  }

  QualType T;
  if (Error Err = importInto(T, D->getType()))
    return std::move(Err);
  D2->setType(T);

  auto TInfoOrErr = import(D->getTypeSourceInfo());
  if (!TInfoOrErr)
    return TInfoOrErr.takeError();
  D2->setTypeSourceInfo(*TInfoOrErr);

  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;
6311}

6313ExpectedDecl
6314ASTNodeImporter::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);

// At creation of the template the template parameters are "adopted"
// (DeclContext is changed). After this possible change the lookup table
// must be updated.
// At deduction guides the DeclContext of the template parameters may be
// different from what we would expect, it may be the class template, or a
// probably different CXXDeductionGuideDecl. This may come from the fact that
// the template parameter objects may be shared between deduction guides or
// the class template, and at creation of multiple FunctionTemplateDecl
// objects (for deduction guides) the same parameters are re-used. The
// "adoption" happens multiple times with different parent, even recursively
// for TemplateTemplateParmDecl. The same happens at import when the
// FunctionTemplateDecl objects are created, but in different order.
// In this way the DeclContext of these template parameters is not necessarily
// the same as in the "from" context.
SmallVector<DeclContext *, 2> OldParamDC;
OldParamDC.reserve(Params->size());
llvm::transform(*Params, std::back_inserter(OldParamDC),
                [](NamedDecl *ND) { return ND->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);

ASTImporterLookupTable *LT = Importer.SharedState->getLookupTable();
if (LT && !OldParamDC.empty()) {
  for (unsigned int I = 0; I < OldParamDC.size(); ++I)
    LT->updateForced(Params->getParam(I), OldParamDC[I]);
}

if (FoundByLookup) {
  auto *Recent =
      const_cast<FunctionTemplateDecl *>(FoundByLookup->getMostRecentDecl());
  if (!TemplatedFD->getPreviousDecl()) {
    assert(FoundByLookup->getTemplatedDecl() &&(static_cast <bool> (FoundByLookup->getTemplatedDecl
() && "Found decl must have its templated decl set") ?
 void (0) : __assert_fail ("FoundByLookup->getTemplatedDecl() && \"Found decl must have its templated decl set\""
, "clang/lib/AST/ASTImporter.cpp", 6405, __extension__ __PRETTY_FUNCTION__
))
           "Found decl must have its templated decl set")(static_cast <bool> (FoundByLookup->getTemplatedDecl
() && "Found decl must have its templated decl set") ?
 void (0) : __assert_fail ("FoundByLookup->getTemplatedDecl() && \"Found decl must have its templated decl set\""
, "clang/lib/AST/ASTImporter.cpp", 6405, __extension__ __PRETTY_FUNCTION__
));
    auto *PrevTemplated =
        FoundByLookup->getTemplatedDecl()->getMostRecentDecl();
    if (TemplatedFD != PrevTemplated)
      TemplatedFD->setPreviousDecl(PrevTemplated);
  }
  ToFunc->setPreviousDecl(Recent);
}

return ToFunc;
6415}

6417//----------------------------------------------------------------------------
6418// Import Statements
6419//----------------------------------------------------------------------------

6421ExpectedStmt ASTNodeImporter::VisitStmt(Stmt *S) {
Importer.FromDiag(S->getBeginLoc(), diag::err_unsupported_ast_node)
    << S->getStmtClassName();
return make_error<ASTImportError>(ASTImportError::UnsupportedConstruct);
6425}


6428ExpectedStmt ASTNodeImporter::VisitGCCAsmStmt(GCCAsmStmt *S) {
if (Importer.returnWithErrorInTest())
  return make_error<ASTImportError>(ASTImportError::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);
6508}

6510ExpectedStmt 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);
6519}

6521ExpectedStmt ASTNodeImporter::VisitNullStmt(NullStmt *S) {
ExpectedSLoc ToSemiLocOrErr = import(S->getSemiLoc());
if (!ToSemiLocOrErr)
  return ToSemiLocOrErr.takeError();
return new (Importer.getToContext()) NullStmt(
    *ToSemiLocOrErr, S->hasLeadingEmptyMacro());
6527}

6529ExpectedStmt 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();

FPOptionsOverride FPO =
    S->hasStoredFPFeatures() ? S->getStoredFPFeatures() : FPOptionsOverride();
return CompoundStmt::Create(Importer.getToContext(), ToStmts, FPO,
                            *ToLBracLocOrErr, *ToRBracLocOrErr);
6547}

6549ExpectedStmt 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;
6566}

6568ExpectedStmt 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);
6579}

6581ExpectedStmt 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);
6592}

6594ExpectedStmt 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);
6608}

6610ExpectedStmt 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->getStatementKind(),
                      ToInit, ToConditionVariable, ToCond, ToLParenLoc,
                      ToRParenLoc, ToThen, ToElseLoc, ToElse);
6628}

6630ExpectedStmt 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;
6664}

6666ExpectedStmt 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);
6680}

6682ExpectedStmt 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);
6695}

6697ExpectedStmt 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);
6715}

6717ExpectedStmt 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);
6728}

6730ExpectedStmt 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);
6741}

6743ExpectedStmt ASTNodeImporter::VisitContinueStmt(ContinueStmt *S) {
ExpectedSLoc ToContinueLocOrErr = import(S->getContinueLoc());
if (!ToContinueLocOrErr)
  return ToContinueLocOrErr.takeError();
return new (Importer.getToContext()) ContinueStmt(*ToContinueLocOrErr);
6748}

6750ExpectedStmt ASTNodeImporter::VisitBreakStmt(BreakStmt *S) {
auto ToBreakLocOrErr = import(S->getBreakLoc());
if (!ToBreakLocOrErr)
  return ToBreakLocOrErr.takeError();
return new (Importer.getToContext()) BreakStmt(*ToBreakLocOrErr);
6755}

6757ExpectedStmt 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);
6768}

6770ExpectedStmt 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);
6781}

6783ExpectedStmt 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,
                          cast<CompoundStmt>(*ToTryBlockOrErr), ToHandlers);
6803}

6805ExpectedStmt 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);
6826}

6828ExpectedStmt
6829ASTNodeImporter::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);
6844}

6846ExpectedStmt 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);
6858}

6860ExpectedStmt 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);
6869}

6871ExpectedStmt 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);
6893}

6895ExpectedStmt
6896ASTNodeImporter::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);
6907}

6909ExpectedStmt 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);
6918}

6920ExpectedStmt 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);
6930}

6932//----------------------------------------------------------------------------
6933// Import Expressions
6934//----------------------------------------------------------------------------
6935ExpectedStmt ASTNodeImporter::VisitExpr(Expr *E) {
Importer.FromDiag(E->getBeginLoc(), diag::err_unsupported_ast_node)
    << E->getStmtClassName();
return make_error<ASTImportError>(ASTImportError::UnsupportedConstruct);
6939}

6941ExpectedStmt ASTNodeImporter::VisitSourceLocExpr(SourceLocExpr *E) {
Error Err = Error::success();
auto ToType = importChecked(Err, E->getType());
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(), ToType, BLoc,
                  RParenLoc, *ParentContextOrErr);
6955}

6957ExpectedStmt 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());
6971}

6973ExpectedStmt 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);
6995}

6997ExpectedStmt ASTNodeImporter::VisitShuffleVectorExpr(ShuffleVectorExpr *E) {
Error Err = Error::success();
auto ToRParenLoc = importChecked(Err, E->getRParenLoc());
auto ToBeginLoc = importChecked(Err, E->getBeginLoc());
auto ToType = importChecked(Err, E->getType());
const unsigned NumSubExprs = E->getNumSubExprs();

llvm::SmallVector<Expr *, 8> ToSubExprs;
llvm::ArrayRef<Expr *> FromSubExprs(E->getSubExprs(), NumSubExprs);
ToSubExprs.resize(NumSubExprs);

if ((Err = ImportContainerChecked(FromSubExprs, ToSubExprs)))
  return std::move(Err);

return new (Importer.getToContext()) ShuffleVectorExpr(
    Importer.getToContext(), ToSubExprs, ToType, ToBeginLoc, ToRParenLoc);
7013}

7015ExpectedStmt 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);
7025}

7027ExpectedStmt
7028ASTNodeImporter::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::ArrayRef(ToAssocTypes),
      llvm::ArrayRef(ToAssocExprs), ToDefaultLoc, ToRParenLoc,
      E->containsUnexpandedParameterPack());
}

return GenericSelectionExpr::Create(
    ToCtx, ToGenericLoc, ToControllingExpr, llvm::ArrayRef(ToAssocTypes),
    llvm::ArrayRef(ToAssocExprs), ToDefaultLoc, ToRParenLoc,
    E->containsUnexpandedParameterPack(), E->getResultIndex());
7059}

7061ExpectedStmt 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);
7072}

7074ExpectedStmt 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;
7110}

7112ExpectedStmt ASTNodeImporter::VisitImplicitValueInitExpr(ImplicitValueInitExpr *E) {
ExpectedType TypeOrErr = import(E->getType());
if (!TypeOrErr)
  return TypeOrErr.takeError();

return new (Importer.getToContext()) ImplicitValueInitExpr(*TypeOrErr);
7118}

7120ExpectedStmt 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);
7146}

7148ExpectedStmt
7149ASTNodeImporter::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);
7160}

7162ExpectedStmt 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);
7173}


7176ExpectedStmt 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);
7188}

7190ExpectedStmt 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);
7201}

7203ExpectedStmt 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));
7215}

7217ExpectedStmt 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);
7228}

7230ExpectedStmt 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());
7243}

7245ExpectedStmt 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());
7258}

7260ExpectedStmt 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);
7278}

7280ExpectedStmt 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);
7291}
7292ExpectedStmt 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);
7300}
7301ExpectedStmt 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);
7311}

7313ExpectedStmt 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);
7328}

7330ExpectedStmt 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());
7342}

7344ExpectedStmt 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());
7356}

7358ExpectedStmt

7360ASTNodeImporter::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);
7385}

7387ExpectedStmt 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());
7400}

7402ExpectedStmt 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());
7416}

7418ExpectedStmt
7419ASTNodeImporter::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());
7436}

7438ExpectedStmt 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);
7452}

7454ExpectedStmt 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);
7466}

7468ExpectedStmt 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);
7478}

7480ExpectedStmt 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);
7492}

7494ExpectedStmt
7495ASTNodeImporter::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(),
    ToComputationLHSType, ToComputationResultType);
7512}

7514Expected<CXXCastPath>
7515ASTNodeImporter::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;
7524}

7526ExpectedStmt 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());
7542}

7544ExpectedStmt 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!")::llvm::llvm_unreachable_internal("Cast expression of unsupported type!"
, "clang/lib/AST/ASTImporter.cpp", 7599);
  return make_error<ASTImportError>(ASTImportError::UnsupportedConstruct);
}
7602}

7604ExpectedStmt 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);
7665}

7667ExpectedStmt 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);
7684}

7686ExpectedStmt 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());
7696}

7698ExpectedStmt 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()) {
  std::optional<ParmVarDecl *> FromParam =
      Importer.getImportedFromDecl(ToParam);
  assert(FromParam && "ParmVarDecl was not imported?")(static_cast <bool> (FromParam && "ParmVarDecl was not imported?"
) ? void (0) : __assert_fail ("FromParam && \"ParmVarDecl was not imported?\""
, "clang/lib/AST/ASTImporter.cpp", 7721, __extension__ __PRETTY_FUNCTION__
));

  if (Error Err = ImportDefaultArgOfParmVarDecl(*FromParam, ToParam))
    return std::move(Err);
}
Expr *RewrittenInit = nullptr;
if (E->hasRewrittenInit()) {
  ExpectedExpr ExprOrErr = import(E->getRewrittenExpr());
  if (!ExprOrErr)
    return ExprOrErr.takeError();
  RewrittenInit = ExprOrErr.get();
}
return CXXDefaultArgExpr::Create(Importer.getToContext(), *ToUsedLocOrErr,
                                 *ToParamOrErr, RewrittenInit,
                                 *UsedContextOrErr);
7736}

7738ExpectedStmt
7739ASTNodeImporter::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);
7749}

7751ExpectedStmt
7752ASTNodeImporter::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);
7764}

7766ExpectedStmt

7768ASTNodeImporter::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());
7786}

7788ExpectedDecl 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;
7809}

7811ExpectedStmt
7812ASTNodeImporter::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;
7830}

7832ExpectedStmt 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());
7842}

7844ExpectedStmt 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);

std::optional<unsigned> Length;
if (!E->isValueDependent())
  Length = E->getPackLength();

SmallVector<TemplateArgument, 8> ToPartialArguments;
if (E->isPartiallySubstituted()) {
  if (Error Err = ImportTemplateArguments(E->getPartialArguments(),
                                          ToPartialArguments))
    return std::move(Err);
}

return SizeOfPackExpr::Create(
    Importer.getToContext(), ToOperatorLoc, ToPack, ToPackLoc, ToRParenLoc,
    Length, ToPartialArguments);
7867}


7870ExpectedStmt 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);
7896}

7898ExpectedStmt 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);
7911}

7913ExpectedStmt 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);
7932}

7934ExpectedStmt 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);
7946}

7948ExpectedStmt 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());
7963}

7965ExpectedStmt 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());
7976}

7978ExpectedStmt 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 CXXBoolLiteralExpr::Create(Importer.getToContext(), E->getValue(),
                                  *ToTypeOrErr, *ToLocationOrErr);
7989}

7991ExpectedStmt 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());
8024}

8026ExpectedStmt
8027ASTNodeImporter::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);
8055}

8057ExpectedStmt 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);
8101}

8103ExpectedStmt
8104ASTNodeImporter::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);
8131}

8133ExpectedStmt 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::ArrayRef(ToArgs), ToRParenLoc, E->isListInitialization());
8151}

8153ExpectedStmt
8154ASTNodeImporter::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());
8202}

8204ExpectedStmt
8205ASTNodeImporter::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());
1
Calling 'ASTNodeImporter::importChecked'→
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());
8250}

8252ExpectedStmt 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());
8275}

8277ExpectedStmt 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());
8304}


8307ExpectedStmt 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;
8350}

8352ExpectedStmt 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);
8364}

8366ExpectedStmt 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());
8378}

8380ExpectedStmt 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);
8390}

8392ExpectedStmt ASTNodeImporter::VisitArrayInitIndexExpr(ArrayInitIndexExpr *E) {
ExpectedType ToTypeOrErr = import(E->getType());
if (!ToTypeOrErr)
  return ToTypeOrErr.takeError();
return new (Importer.getToContext()) ArrayInitIndexExpr(*ToTypeOrErr);
8397}

8399ExpectedStmt 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();

FieldDecl *ToField = *ToFieldOrErr;
assert(ToField->hasInClassInitializer() &&(static_cast <bool> (ToField->hasInClassInitializer(
) && "Field should have in-class initializer if there is a default init "
 "expression that uses it.") ? void (0) : __assert_fail ("ToField->hasInClassInitializer() && \"Field should have in-class initializer if there is a default init \" \"expression that uses it.\""
, "clang/lib/AST/ASTImporter.cpp", 8415, __extension__ __PRETTY_FUNCTION__
))
       "Field should have in-class initializer if there is a default init "(static_cast <bool> (ToField->hasInClassInitializer(
) && "Field should have in-class initializer if there is a default init "
 "expression that uses it.") ? void (0) : __assert_fail ("ToField->hasInClassInitializer() && \"Field should have in-class initializer if there is a default init \" \"expression that uses it.\""
, "clang/lib/AST/ASTImporter.cpp", 8415, __extension__ __PRETTY_FUNCTION__
))
       "expression that uses it.")(static_cast <bool> (ToField->hasInClassInitializer(
) && "Field should have in-class initializer if there is a default init "
 "expression that uses it.") ? void (0) : __assert_fail ("ToField->hasInClassInitializer() && \"Field should have in-class initializer if there is a default init \" \"expression that uses it.\""
, "clang/lib/AST/ASTImporter.cpp", 8415, __extension__ __PRETTY_FUNCTION__
));
if (!ToField->getInClassInitializer()) {
  // The in-class initializer may be not yet set in "To" AST even if the
  // field is already there. This must be set here to make construction of
  // CXXDefaultInitExpr work.
  auto ToInClassInitializerOrErr =
      import(E->getField()->getInClassInitializer());
  if (!ToInClassInitializerOrErr)
    return ToInClassInitializerOrErr.takeError();
  ToField->setInClassInitializer(*ToInClassInitializerOrErr);
}

Expr *RewrittenInit = nullptr;
if (E->hasRewrittenInit()) {
  ExpectedExpr ExprOrErr = import(E->getRewrittenExpr());
  if (!ExprOrErr)
    return ExprOrErr.takeError();
  RewrittenInit = ExprOrErr.get();
}

return CXXDefaultInitExpr::Create(Importer.getToContext(), *ToBeginLocOrErr,
                                  ToField, *UsedContextOrErr, RewrittenInit);
8437}

8439ExpectedStmt 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")::llvm::llvm_unreachable_internal("Unknown cast type", "clang/lib/AST/ASTImporter.cpp"
, 8474);
  return make_error<ASTImportError>();
}
8477}

8479ExpectedStmt ASTNodeImporter::VisitSubstNonTypeTemplateParmExpr(
  SubstNonTypeTemplateParmExpr *E) {
Error Err = Error::success();
auto ToType = importChecked(Err, E->getType());
auto ToExprLoc = importChecked(Err, E->getExprLoc());
auto ToAssociatedDecl = importChecked(Err, E->getAssociatedDecl());
auto ToReplacement = importChecked(Err, E->getReplacement());
if (Err)
  return std::move(Err);

return new (Importer.getToContext()) SubstNonTypeTemplateParmExpr(
    ToType, E->getValueKind(), ToExprLoc, ToReplacement, ToAssociatedDecl,
    E->getIndex(), E->getPackIndex(), E->isReferenceParameter());
8492}

8494ExpectedStmt 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);
8513}

8515ExpectedStmt 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);
8538}

8540ExpectedStmt 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());
8557}

8559Error 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;
8571}

8573ASTImporter::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();
8588}

8590ASTImporter::~ASTImporter() = default;

8592std::optional<unsigned> ASTImporter::getFieldIndex(Decl *F) {
assert(F && (isa<FieldDecl>(*F) || isa<IndirectFieldDecl>(*F)) &&(static_cast <bool> (F && (isa<FieldDecl>
(*F) || isa<IndirectFieldDecl>(*F)) && "Try to get field index for non-field."
) ? void (0) : __assert_fail ("F && (isa<FieldDecl>(*F) || isa<IndirectFieldDecl>(*F)) && \"Try to get field index for non-field.\""
, "clang/lib/AST/ASTImporter.cpp", 8594, __extension__ __PRETTY_FUNCTION__
))
    "Try to get field index for non-field.")(static_cast <bool> (F && (isa<FieldDecl>
(*F) || isa<IndirectFieldDecl>(*F)) && "Try to get field index for non-field."
) ? void (0) : __assert_fail ("F && (isa<FieldDecl>(*F) || isa<IndirectFieldDecl>(*F)) && \"Try to get field index for non-field.\""
, "clang/lib/AST/ASTImporter.cpp", 8594, __extension__ __PRETTY_FUNCTION__
));

auto *Owner = dyn_cast<RecordDecl>(F->getDeclContext());
if (!Owner)
  return std::nullopt;

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.")::llvm::llvm_unreachable_internal("Field was not found in its parent context."
, "clang/lib/AST/ASTImporter.cpp", 8609);

return std::nullopt;
8612}

8614ASTImporter::FoundDeclsTy
8615ASTImporter::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;
}
8645}

8647void ASTImporter::AddToLookupTable(Decl *ToD) {
SharedState->addDeclToLookup(ToD);
8649}

8651Expected<Decl *> ASTImporter::ImportImpl(Decl *FromD) {
// Import the decl using ASTNodeImporter.
ASTNodeImporter Importer(*this);
return Importer.Visit(FromD);
8655}

8657void ASTImporter::RegisterImportedDecl(Decl *FromD, Decl *ToD) {
MapImported(FromD, ToD);
8659}

8661llvm::Expected<ExprWithCleanups::CleanupObject>
8662ASTImporter::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<ASTImportError>(ASTImportError::UnsupportedConstruct);
8671}

8673ExpectedTypePtr 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();
8693}

8695Expected<QualType> ASTImporter::Import(QualType FromT) {
if (FromT.isNull())
  return QualType{};

ExpectedTypePtr ToTyOrErr = Import(FromT.getTypePtr());
if (!ToTyOrErr)
  return ToTyOrErr.takeError();

return ToContext.getQualifiedType(*ToTyOrErr, FromT.getLocalQualifiers());
8704}

8706Expected<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);
8720}

8722namespace {
8723// To use this object, it should be created before the new attribute is created,
8724// and destructed after it is created. The construction already performs the
8725// import of the data.
8726template <typename T> struct AttrArgImporter {
AttrArgImporter(const AttrArgImporter<T> &) = delete;
AttrArgImporter(AttrArgImporter<T> &&) = default;
AttrArgImporter<T> &operator=(const AttrArgImporter<T> &) = delete;
AttrArgImporter<T> &operator=(AttrArgImporter<T> &&) = default;

AttrArgImporter(ASTNodeImporter &I, Error &Err, const T &From)
    : To(I.importChecked(Err, From)) {}

const T &value() { return To; }

8737private:
T To;
8739};

8741// To use this object, it should be created before the new attribute is created,
8742// and destructed after it is created. The construction already performs the
8743// import of the data. The array data is accessible in a pointer form, this form
8744// is used by the attribute classes. This object should be created once for the
8745// array data to be imported (the array size is not imported, just copied).
8746template <typename T> struct AttrArgArrayImporter {
AttrArgArrayImporter(const AttrArgArrayImporter<T> &) = delete;
AttrArgArrayImporter(AttrArgArrayImporter<T> &&) = default;
AttrArgArrayImporter<T> &operator=(const AttrArgArrayImporter<T> &) = delete;
AttrArgArrayImporter<T> &operator=(AttrArgArrayImporter<T> &&) = default;

AttrArgArrayImporter(ASTNodeImporter &I, Error &Err,
                     const llvm::iterator_range<T *> &From,
                     unsigned ArraySize) {
  if (Err)
    return;
  To.reserve(ArraySize);
  Err = I.ImportContainerChecked(From, To);
}

T *value() { return To.data(); }

8763private:
llvm::SmallVector<T, 2> To;
8765};

8767class AttrImporter {
Error Err{Error::success()};
Attr *ToAttr = nullptr;
ASTImporter &Importer;
ASTNodeImporter NImporter;

8773public:
AttrImporter(ASTImporter &I) : Importer(I), NImporter(I) {}

// Create an "importer" for an attribute parameter.
// Result of the 'value()' of that object is to be passed to the function
// 'importAttr', in the order that is expected by the attribute class.
template <class T> AttrArgImporter<T> importArg(const T &From) {
  return AttrArgImporter<T>(NImporter, Err, From);
}

// Create an "importer" for an attribute parameter that has array type.
// Result of the 'value()' of that object is to be passed to the function
// 'importAttr', then the size of the array as next argument.
template <typename T>
AttrArgArrayImporter<T> importArrayArg(const llvm::iterator_range<T *> &From,
                                       unsigned ArraySize) {
  return AttrArgArrayImporter<T>(NImporter, Err, From, ArraySize);
}

// Create an attribute object with the specified arguments.
// The 'FromAttr' is the original (not imported) attribute, the 'ImportedArg'
// should be values that are passed to the 'Create' function of the attribute.
// (The 'Create' with 'ASTContext' first and 'AttributeCommonInfo' last is
// used here.) As much data is copied or imported from the old attribute
// as possible. The passed arguments should be already imported.
// If an import error happens, the internal error is set to it, and any
// further import attempt is ignored.
template <typename T, typename... Arg>
void importAttr(const T *FromAttr, Arg &&...ImportedArg) {
  static_assert(std::is_base_of<Attr, T>::value,
                "T should be subclass of Attr.");
  assert(!ToAttr && "Use one AttrImporter to import one Attribute object.")(static_cast <bool> (!ToAttr && "Use one AttrImporter to import one Attribute object."
) ? void (0) : __assert_fail ("!ToAttr && \"Use one AttrImporter to import one Attribute object.\""
, "clang/lib/AST/ASTImporter.cpp", 8804, __extension__ __PRETTY_FUNCTION__
));

  const IdentifierInfo *ToAttrName = Importer.Import(FromAttr->getAttrName());
  const IdentifierInfo *ToScopeName =
      Importer.Import(FromAttr->getScopeName());
  SourceRange ToAttrRange =
      NImporter.importChecked(Err, FromAttr->getRange());
  SourceLocation ToScopeLoc =
      NImporter.importChecked(Err, FromAttr->getScopeLoc());

  if (Err)
    return;

  AttributeCommonInfo ToI(ToAttrName, ToScopeName, ToAttrRange, ToScopeLoc,
                          FromAttr->getParsedKind(), FromAttr->getForm());
  // The "SemanticSpelling" is not needed to be passed to the constructor.
  // That value is recalculated from the SpellingListIndex if needed.
  ToAttr = T::Create(Importer.getToContext(),
                     std::forward<Arg>(ImportedArg)..., ToI);

  ToAttr->setImplicit(FromAttr->isImplicit());
  ToAttr->setPackExpansion(FromAttr->isPackExpansion());
  if (auto *ToInheritableAttr = dyn_cast<InheritableAttr>(ToAttr))
    ToInheritableAttr->setInherited(FromAttr->isInherited());
}

// Create a clone of the 'FromAttr' and import its source range only.
// This causes objects with invalid references to be created if the 'FromAttr'
// contains other data that should be imported.
void cloneAttr(const Attr *FromAttr) {
  assert(!ToAttr && "Use one AttrImporter to import one Attribute object.")(static_cast <bool> (!ToAttr && "Use one AttrImporter to import one Attribute object."
) ? void (0) : __assert_fail ("!ToAttr && \"Use one AttrImporter to import one Attribute object.\""
, "clang/lib/AST/ASTImporter.cpp", 8834, __extension__ __PRETTY_FUNCTION__
));

  SourceRange ToRange = NImporter.importChecked(Err, FromAttr->getRange());
  if (Err)
    return;

  ToAttr = FromAttr->clone(Importer.getToContext());
  ToAttr->setRange(ToRange);
}

// Get the result of the previous import attempt (can be used only once).
llvm::Expected<Attr *> getResult() && {
  if (Err)
    return std::move(Err);
  assert(ToAttr && "Attribute should be created.")(static_cast <bool> (ToAttr && "Attribute should be created."
) ? void (0) : __assert_fail ("ToAttr && \"Attribute should be created.\""
, "clang/lib/AST/ASTImporter.cpp", 8848, __extension__ __PRETTY_FUNCTION__
));
  return ToAttr;
}
8851};
8852} // namespace

8854Expected<Attr *> ASTImporter::Import(const Attr *FromAttr) {
AttrImporter AI(*this);

// FIXME: Is there some kind of AttrVisitor to use here?
switch (FromAttr->getKind()) {
case attr::Aligned: {
  auto *From = cast<AlignedAttr>(FromAttr);
  if (From->isAlignmentExpr())
    AI.importAttr(From, true, AI.importArg(From->getAlignmentExpr()).value());
  else
    AI.importAttr(From, false,
                  AI.importArg(From->getAlignmentType()).value());
  break;
}

case attr::Format: {
  const auto *From = cast<FormatAttr>(FromAttr);
  AI.importAttr(From, Import(From->getType()), From->getFormatIdx(),
                From->getFirstArg());
  break;
}

case attr::EnableIf: {
  const auto *From = cast<EnableIfAttr>(FromAttr);
  AI.importAttr(From, AI.importArg(From->getCond()).value(),
                From->getMessage());
  break;
}

case attr::AssertCapability: {
  const auto *From = cast<AssertCapabilityAttr>(FromAttr);
  AI.importAttr(From,
                AI.importArrayArg(From->args(), From->args_size()).value(),
                From->args_size());
  break;
}
case attr::AcquireCapability: {
  const auto *From = cast<AcquireCapabilityAttr>(FromAttr);
  AI.importAttr(From,
                AI.importArrayArg(From->args(), From->args_size()).value(),
                From->args_size());
  break;
}
case attr::TryAcquireCapability: {
  const auto *From = cast<TryAcquireCapabilityAttr>(FromAttr);
  AI.importAttr(From, AI.importArg(From->getSuccessValue()).value(),
                AI.importArrayArg(From->args(), From->args_size()).value(),
                From->args_size());
  break;
}
case attr::ReleaseCapability: {
  const auto *From = cast<ReleaseCapabilityAttr>(FromAttr);
  AI.importAttr(From,
                AI.importArrayArg(From->args(), From->args_size()).value(),
                From->args_size());
  break;
}
case attr::RequiresCapability: {
  const auto *From = cast<RequiresCapabilityAttr>(FromAttr);
  AI.importAttr(From,
                AI.importArrayArg(From->args(), From->args_size()).value(),
                From->args_size());
  break;
}
case attr::GuardedBy: {
  const auto *From = cast<GuardedByAttr>(FromAttr);
  AI.importAttr(From, AI.importArg(From->getArg()).value());
  break;
}
case attr::PtGuardedBy: {
  const auto *From = cast<PtGuardedByAttr>(FromAttr);
  AI.importAttr(From, AI.importArg(From->getArg()).value());
  break;
}
case attr::AcquiredAfter: {
  const auto *From = cast<AcquiredAfterAttr>(FromAttr);
  AI.importAttr(From,
                AI.importArrayArg(From->args(), From->args_size()).value(),
                From->args_size());
  break;
}
case attr::AcquiredBefore: {
  const auto *From = cast<AcquiredBeforeAttr>(FromAttr);
  AI.importAttr(From,
                AI.importArrayArg(From->args(), From->args_size()).value(),
                From->args_size());
  break;
}
case attr::AssertExclusiveLock: {
  const auto *From = cast<AssertExclusiveLockAttr>(FromAttr);
  AI.importAttr(From,
                AI.importArrayArg(From->args(), From->args_size()).value(),
                From->args_size());
  break;
}
case attr::AssertSharedLock: {
  const auto *From = cast<AssertSharedLockAttr>(FromAttr);
  AI.importAttr(From,
                AI.importArrayArg(From->args(), From->args_size()).value(),
                From->args_size());
  break;
}
case attr::ExclusiveTrylockFunction: {
  const auto *From = cast<ExclusiveTrylockFunctionAttr>(FromAttr);
  AI.importAttr(From, AI.importArg(From->getSuccessValue()).value(),
                AI.importArrayArg(From->args(), From->args_size()).value(),
                From->args_size());
  break;
}
case attr::SharedTrylockFunction: {
  const auto *From = cast<SharedTrylockFunctionAttr>(FromAttr);
  AI.importAttr(From, AI.importArg(From->getSuccessValue()).value(),
                AI.importArrayArg(From->args(), From->args_size()).value(),
                From->args_size());
  break;
}
case attr::LockReturned: {
  const auto *From = cast<LockReturnedAttr>(FromAttr);
  AI.importAttr(From, AI.importArg(From->getArg()).value());
  break;
}
case attr::LocksExcluded: {
  const auto *From = cast<LocksExcludedAttr>(FromAttr);
  AI.importAttr(From,
                AI.importArrayArg(From->args(), From->args_size()).value(),
                From->args_size());
  break;
}

default: {
  // The default branch works for attributes that have no arguments to import.
  // FIXME: Handle every attribute type that has arguments of type to import
  // (most often Expr* or Decl* or type) in the switch above.
  AI.cloneAttr(FromAttr);
  break;
}
}

return std::move(AI).getResult();
8993}

8995Decl *ASTImporter::GetAlreadyImportedOrNull(const Decl *FromD) const {
auto Pos = ImportedDecls.find(FromD);
if (Pos != ImportedDecls.end())
  return Pos->second;
else
  return nullptr;
9001}

9003TranslationUnitDecl *ASTImporter::GetFromTU(Decl *ToD) {
auto FromDPos = ImportedFromDecls.find(ToD);
if (FromDPos == ImportedFromDecls.end())
  return nullptr;
return FromDPos->second->getTranslationUnitDecl();
9008}

9010Error ASTImporter::ImportAttrs(Decl *ToD, Decl *FromD) {
if (!FromD->hasAttrs() || ToD->hasAttrs())
  return Error::success();
for (const Attr *FromAttr : FromD->getAttrs()) {
  auto ToAttrOrErr = Import(FromAttr);
  if (ToAttrOrErr)
    ToD->addAttr(*ToAttrOrErr);
  else
    return ToAttrOrErr.takeError();
}
return Error::success();
9021}

9023Expected<Decl *> ASTImporter::Import(Decl *FromD) {
if (!FromD)
  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))
  return make_error<ASTImportError>(*Error);

// Check whether we've already imported this declaration.
Decl *ToD = GetAlreadyImportedOrNull(FromD);
if (ToD) {
  // Already imported (possibly from another TU) and with an error.
  if (auto Error = SharedState->getImportDeclErrorIfAny(ToD)) {
    setImportDeclError(FromD, *Error);
    return make_error<ASTImportError>(*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);
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?).
  ASTImportError ErrOut;
  handleAllErrors(ToDOrErr.takeError(),
                  [&ErrOut](const ASTImportError &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]) {
    // The import path contains import-dependency nodes first.
    // Save the node that was imported as dependency of the current node.
    Decl *PrevFromDi = FromD;
    for (Decl *FromDi : Path) {
      // Begin and end of the path equals 'FromD', skip it.
      if (FromDi == FromD)
        continue;
      // We should not set import error on a node and all following nodes in
      // the path if child import errors are ignored.
      if (ChildErrorHandlingStrategy(FromDi).ignoreChildErrorOnParent(
              PrevFromDi))
        break;
      PrevFromDi = FromDi;
      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<ASTImportError>(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)(static_cast <bool> (Err) ? void (0) : __assert_fail ("Err"
, "clang/lib/AST/ASTImporter.cpp", 9143, __extension__ __PRETTY_FUNCTION__
));
  return make_error<ASTImportError>(*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<ASTImportError>(*Error);
}

// Make sure that ImportImpl registered the imported decl.
assert(ImportedDecls.count(FromD) != 0 && "Missing call to MapImported?")(static_cast <bool> (ImportedDecls.count(FromD) != 0 &&
 "Missing call to MapImported?") ? void (0) : __assert_fail (
"ImportedDecls.count(FromD) != 0 && \"Missing call to MapImported?\""
, "clang/lib/AST/ASTImporter.cpp", 9156, __extension__ __PRETTY_FUNCTION__
));
if (auto Error = ImportAttrs(ToD, FromD))
  return std::move(Error);

// Notify subclasses.
Imported(FromD, ToD);

updateFlags(FromD, ToD);
SavedImportPaths.erase(FromD);
return ToDOrErr;
9166}

9168llvm::Expected<InheritedConstructor>
9169ASTImporter::Import(const InheritedConstructor &From) {
return ASTNodeImporter(*this).ImportInheritedConstructor(From);
9171}

9173Expected<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;
9238}

9240Expected<Expr *> ASTImporter::Import(Expr *FromE) {
if (ExpectedStmt ToSOrErr = Import(cast_or_null<Stmt>(FromE)))
  return cast_or_null<Expr>(*ToSOrErr);
else
  return ToSOrErr.takeError();
9245}

9247Expected<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;
9274}

9276Expected<NestedNameSpecifier *>
9277ASTImporter::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.")(static_cast <bool> (FromNNS->getAsIdentifier() &&
 "NNS should contain identifier.") ? void (0) : __assert_fail
 ("FromNNS->getAsIdentifier() && \"NNS should contain identifier.\""
, "clang/lib/AST/ASTImporter.cpp", 9287, __extension__ __PRETTY_FUNCTION__
));
  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 (ExpectedTypePtr TyOrErr = Import(FromNNS->getAsType())) {
    bool TSTemplate =
        FromNNS->getKind() == NestedNameSpecifier::TypeSpecWithTemplate;
    return NestedNameSpecifier::Create(ToContext, Prefix, TSTemplate,
                                       *TyOrErr);
  } else {
    return TyOrErr.takeError();
  }
}

llvm_unreachable("Invalid nested name specifier kind")::llvm::llvm_unreachable_internal("Invalid nested name specifier kind"
, "clang/lib/AST/ASTImporter.cpp", 9327);
9328}

9330Expected<NestedNameSpecifierLoc>
9331ASTImporter::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) {
5
←
Loop condition is false. Execution continues on line 9343→
  NestedNames.push_back(NNS);
  NNS = NNS.getPrefix();
}

NestedNameSpecifierLocBuilder Builder;

while (!NestedNames.empty()) {
6
←
Loop condition is true.  Entering loop body→
  NNS = NestedNames.pop_back_val();
  NestedNameSpecifier *Spec = nullptr;
7
←
'Spec' initialized to a null pointer value→
  if (Error Err = importInto(Spec, NNS.getNestedNameSpecifier()))
8
←
Calling 'ASTImporter::importInto'→
11
←
Returning from 'ASTImporter::importInto'→
12
←
Assuming the condition is false→
13
←
Taking false branch→
    return std::move(Err);

  NestedNameSpecifier::SpecifierKind Kind = Spec->getKind();
14
←
Called C++ object pointer is null

  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());
9414}

9416Expected<TemplateName> ASTImporter::Import(TemplateName From) {
switch (From.getKind()) {
case TemplateName::Template:
  if (ExpectedDecl ToTemplateOrErr = Import(From.getAsTemplateDecl()))
    return TemplateName(cast<TemplateDecl>((*ToTemplateOrErr)->getCanonicalDecl()));
  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();
  auto TNOrErr = Import(QTN->getUnderlyingTemplate());
  if (!TNOrErr)
    return TNOrErr.takeError();
  return ToContext.getQualifiedTemplateName(
      *QualifierOrErr, QTN->hasTemplateKeyword(), *TNOrErr);
}

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();
  auto ReplacementOrErr = Import(Subst->getReplacement());
  if (!ReplacementOrErr)
    return ReplacementOrErr.takeError();

  auto AssociatedDeclOrErr = Import(Subst->getAssociatedDecl());
  if (!AssociatedDeclOrErr)
    return AssociatedDeclOrErr.takeError();

  return ToContext.getSubstTemplateTemplateParm(
      *ReplacementOrErr, *AssociatedDeclOrErr, Subst->getIndex(),
      Subst->getPackIndex());
}

case TemplateName::SubstTemplateTemplateParmPack: {
  SubstTemplateTemplateParmPackStorage *SubstPack =
      From.getAsSubstTemplateTemplateParmPack();
  ASTNodeImporter Importer(*this);
  auto ArgPackOrErr =
      Importer.ImportTemplateArgument(SubstPack->getArgumentPack());
  if (!ArgPackOrErr)
    return ArgPackOrErr.takeError();

  auto AssociatedDeclOrErr = Import(SubstPack->getAssociatedDecl());
  if (!AssociatedDeclOrErr)
    return AssociatedDeclOrErr.takeError();

  return ToContext.getSubstTemplateTemplateParmPack(
      *ArgPackOrErr, *AssociatedDeclOrErr, SubstPack->getIndex(),
      SubstPack->getFinal());
}
case TemplateName::UsingTemplate: {
  auto UsingOrError = Import(From.getAsUsingShadowDecl());
  if (!UsingOrError)
    return UsingOrError.takeError();
  return TemplateName(cast<UsingShadowDecl>(*UsingOrError));
}
}

llvm_unreachable("Invalid template name kind")::llvm::llvm_unreachable_internal("Invalid template name kind"
, "clang/lib/AST/ASTImporter.cpp", 9513);
9514}

9516Expected<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);
9529}

9531Expected<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);
9539}

9541Expected<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 ExLength = FromSM.getFileIDSize(FromID);
  SourceLocation MLoc;
  if (FromEx.isMacroArgExpansion()) {
    MLoc = ToSM.createMacroArgExpansionLoc(*ToSpLoc, *ToExLocS, ExLength);
  } else {
    if (ExpectedSLoc ToExLocE = Import(FromEx.getExpansionLocEnd()))
      MLoc = ToSM.createExpansionLoc(*ToSpLoc, *ToExLocS, *ToExLocE, ExLength,
                                     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!
    std::optional<llvm::MemoryBufferRef> FromBuf =
        Cache->getBufferOrNone(FromContext.getDiagnostics(),
                               FromSM.getFileManager(), SourceLocation{});
    if (!FromBuf)
      return llvm::make_error<ASTImportError>(ASTImportError::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.")(static_cast <bool> (ToID.isValid() && "Unexpected invalid fileID was created."
) ? void (0) : __assert_fail ("ToID.isValid() && \"Unexpected invalid fileID was created.\""
, "clang/lib/AST/ASTImporter.cpp", 9622, __extension__ __PRETTY_FUNCTION__
));

ImportedFileIDs[FromID] = ToID;
return ToID;
9626}

9628Expected<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<ASTImportError>();
}
9690}

9692Expected<CXXBaseSpecifier *>
9693ASTImporter::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;
9712}

9714llvm::Expected<APValue> ASTImporter::Import(const APValue &FromValue) {
ASTNodeImporter Importer(*this);
return Importer.ImportAPValue(FromValue);
9717}

9719Error 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);
9760}

9762Expected<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!")::llvm::llvm_unreachable_internal("Invalid DeclarationName Kind!"
, "clang/lib/AST/ASTImporter.cpp", 9823);
9824}

9826IdentifierInfo *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;
9836}

9838Expected<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());
9847}

9849llvm::Expected<APValue>
9850ASTNodeImporter::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>() &&(static_cast <bool> (!FromValue.getLValueBase().is<DynamicAllocLValue
>() && "in C++20 dynamic allocation are transient so they shouldn't "
 "appear in the AST") ? void (0) : __assert_fail ("!FromValue.getLValueBase().is<DynamicAllocLValue>() && \"in C++20 dynamic allocation are transient so they shouldn't \" \"appear in the AST\""
, "clang/lib/AST/ASTImporter.cpp", 9938, __extension__ __PRETTY_FUNCTION__
))
           "in C++20 dynamic allocation are transient so they shouldn't "(static_cast <bool> (!FromValue.getLValueBase().is<DynamicAllocLValue
>() && "in C++20 dynamic allocation are transient so they shouldn't "
 "appear in the AST") ? void (0) : __assert_fail ("!FromValue.getLValueBase().is<DynamicAllocLValue>() && \"in C++20 dynamic allocation are transient so they shouldn't \" \"appear in the AST\""
, "clang/lib/AST/ASTImporter.cpp", 9938, __extension__ __PRETTY_FUNCTION__
))
           "appear in the AST")(static_cast <bool> (!FromValue.getLValueBase().is<DynamicAllocLValue
>() && "in C++20 dynamic allocation are transient so they shouldn't "
 "appear in the AST") ? void (0) : __assert_fail ("!FromValue.getLValueBase().is<DynamicAllocLValue>() && \"in C++20 dynamic allocation are transient so they shouldn't \" \"appear in the AST\""
, "clang/lib/AST/ASTImporter.cpp", 9938, __extension__ __PRETTY_FUNCTION__
));
    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();
      const Type *ImpTypeInfo = importChecked(
          Err, FromValue.getLValueBase().get<TypeInfoLValue>().getType());
      QualType ImpType =
          importChecked(Err, FromValue.getLValueBase().getTypeInfoType());
      if (Err)
        return std::move(Err);
      Base = APValue::LValueBase::getTypeInfo(TypeInfoLValue(ImpTypeInfo),
                                              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;
10008}

10010Expected<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<ASTImportError>(ASTImportError::NameConflict);
else
  // Allow to create the new Decl with the same name.
  return Name;
10021}

10023DiagnosticBuilder ASTImporter::ToDiag(SourceLocation Loc, unsigned DiagID) {
if (LastDiagFromFrom)
  ToContext.getDiagnostics().notePriorDiagnosticFrom(
    FromContext.getDiagnostics());
LastDiagFromFrom = false;
return ToContext.getDiagnostics().Report(Loc, DiagID);
10029}

10031DiagnosticBuilder ASTImporter::FromDiag(SourceLocation Loc, unsigned DiagID) {
if (!LastDiagFromFrom)
  FromContext.getDiagnostics().notePriorDiagnosticFrom(
    ToContext.getDiagnostics());
LastDiagFromFrom = true;
return FromContext.getDiagnostics().Report(Loc, DiagID);
10037}

10039void 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")(static_cast <bool> (0 && "CompleteDecl called on a Decl that can't be completed"
) ? void (0) : __assert_fail ("0 && \"CompleteDecl called on a Decl that can't be completed\""
, "clang/lib/AST/ASTImporter.cpp", 10055, __extension__ __PRETTY_FUNCTION__
));
}
10057}

10059Decl *ASTImporter::MapImported(Decl *From, Decl *To) {
llvm::DenseMap<Decl *, Decl *>::iterator Pos = ImportedDecls.find(From);
assert((Pos == ImportedDecls.end() || Pos->second == To) &&(static_cast <bool> ((Pos == ImportedDecls.end() || Pos
->second == To) && "Try to import an already imported Decl"
) ? void (0) : __assert_fail ("(Pos == ImportedDecls.end() || Pos->second == To) && \"Try to import an already imported Decl\""
, "clang/lib/AST/ASTImporter.cpp", 10062, __extension__ __PRETTY_FUNCTION__
))
    "Try to import an already imported Decl")(static_cast <bool> ((Pos == ImportedDecls.end() || Pos
->second == To) && "Try to import an already imported Decl"
) ? void (0) : __assert_fail ("(Pos == ImportedDecls.end() || Pos->second == To) && \"Try to import an already imported Decl\""
, "clang/lib/AST/ASTImporter.cpp", 10062, __extension__ __PRETTY_FUNCTION__
));
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;
10075}

10077std::optional<ASTImportError>
10078ASTImporter::getImportDeclErrorIfAny(Decl *FromD) const {
auto Pos = ImportDeclErrors.find(FromD);
if (Pos != ImportDeclErrors.end())
  return Pos->second;
else
  return std::nullopt;
10084}

10086void ASTImporter::setImportDeclError(Decl *From, ASTImportError 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)(static_cast <bool> (InsertRes.second || InsertRes.first
->second.Error == Error.Error) ? void (0) : __assert_fail (
"InsertRes.second || InsertRes.first->second.Error == Error.Error"
, "clang/lib/AST/ASTImporter.cpp", 10091, __extension__ __PRETTY_FUNCTION__
));
10092}

10094bool 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);
10111}

←

/build/source/clang/include/clang/AST/ASTImporter.h

1//===- ASTImporter.h - Importing ASTs from other Contexts -------*- 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 ASTImporter class which imports AST nodes from one
10//  context into another context.
11//
12//===----------------------------------------------------------------------===//

14#ifndef LLVM_CLANG_AST_ASTIMPORTER_H
15#define LLVM_CLANG_AST_ASTIMPORTER_H

17#include "clang/AST/ASTImportError.h"
18#include "clang/AST/DeclBase.h"
19#include "clang/AST/DeclarationName.h"
20#include "clang/AST/ExprCXX.h"
21#include "clang/AST/NestedNameSpecifier.h"
22#include "clang/AST/TemplateName.h"
23#include "clang/AST/Type.h"
24#include "clang/Basic/Diagnostic.h"
25#include "clang/Basic/IdentifierTable.h"
26#include "clang/Basic/LLVM.h"
27#include "clang/Basic/SourceLocation.h"
28#include "llvm/ADT/DenseMap.h"
29#include "llvm/ADT/DenseSet.h"
30#include "llvm/ADT/SmallVector.h"
31#include <optional>
32#include <utility>

34namespace clang {

36class ASTContext;
37class ASTImporterSharedState;
38class Attr;
39class CXXBaseSpecifier;
40class CXXCtorInitializer;
41class Decl;
42class DeclContext;
43class Expr;
44class FileManager;
45class NamedDecl;
46class Stmt;
47class TagDecl;
48class TranslationUnitDecl;
49class TypeSourceInfo;

// \brief Returns with a list of declarations started from the canonical decl
// then followed by subsequent decls in the translation unit.
// This gives a canonical list for each entry in the redecl chain.
// `Decl::redecls()` gives a list of decls which always start from the
// previous decl and the next item is actually the previous item in the order
// of source locations.  Thus, `Decl::redecls()` gives different lists for
// the different entries in a given redecl chain.
llvm::SmallVector<Decl*, 2> getCanonicalForwardRedeclChain(Decl* D);

/// Imports selected nodes from one AST context into another context,
/// merging AST nodes where appropriate.
class ASTImporter {
  friend class ASTNodeImporter;
public:
  using NonEquivalentDeclSet = llvm::DenseSet<std::pair<Decl *, Decl *>>;
  using ImportedCXXBaseSpecifierMap =
      llvm::DenseMap<const CXXBaseSpecifier *, CXXBaseSpecifier *>;

  enum class ODRHandlingType { Conservative, Liberal };

  // An ImportPath is the list of the AST nodes which we visit during an
  // Import call.
  // If node `A` depends on node `B` then the path contains an `A`->`B` edge.
  // From the call stack of the import functions we can read the very same
  // path.
  //
  // Now imagine the following AST, where the `->` represents dependency in
  // therms of the import.
  // ```
  // A->B->C->D
  //    `->E
  // ```
  // We would like to import A.
  // The import behaves like a DFS, so we will visit the nodes in this order:
  // ABCDE.
  // During the visitation we will have the following ImportPaths:
  // ```
  // A
  // AB
  // ABC
  // ABCD
  // ABC
  // AB
  // ABE
  // AB
  // A
  // ```
  // If during the visit of E there is an error then we set an error for E,
  // then as the call stack shrinks for B, then for A:
  // ```
  // A
  // AB
  // ABC
  // ABCD
  // ABC
  // AB
  // ABE // Error! Set an error to E
  // AB  // Set an error to B
  // A   // Set an error to A
  // ```
  // However, during the import we could import C and D without any error and
  // they are independent from A,B and E.
  // We must not set up an error for C and D.
  // So, at the end of the import we have an entry in `ImportDeclErrors` for
  // A,B,E but not for C,D.
  //
  // Now what happens if there is a cycle in the import path?
  // Let's consider this AST:
  // ```
  // A->B->C->A
  //    `->E
  // ```
  // During the visitation we will have the below ImportPaths and if during
  // the visit of E there is an error then we will set up an error for E,B,A.
  // But what's up with C?
  // ```
  // A
  // AB
  // ABC
  // ABCA
  // ABC
  // AB
  // ABE // Error! Set an error to E
  // AB  // Set an error to B
  // A   // Set an error to A
  // ```
  // This time we know that both B and C are dependent on A.
  // This means we must set up an error for C too.
  // As the call stack reverses back we get to A and we must set up an error
  // to all nodes which depend on A (this includes C).
  // But C is no longer on the import path, it just had been previously.
  // Such situation can happen only if during the visitation we had a cycle.
  // If we didn't have any cycle, then the normal way of passing an Error
  // object through the call stack could handle the situation.
  // This is why we must track cycles during the import process for each
  // visited declaration.
  class ImportPathTy {
  public:
    using VecTy = llvm::SmallVector<Decl *, 32>;

    void push(Decl *D) {
      Nodes.push_back(D);
      ++Aux[D];
    }

    void pop() {
      if (Nodes.empty())
        return;
      --Aux[Nodes.back()];
      Nodes.pop_back();
    }

    /// Returns true if the last element can be found earlier in the path.
    bool hasCycleAtBack() const {
      auto Pos = Aux.find(Nodes.back());
      return Pos != Aux.end() && Pos->second > 1;
    }

    using Cycle = llvm::iterator_range<VecTy::const_reverse_iterator>;
    Cycle getCycleAtBack() const {
      assert(Nodes.size() >= 2)(static_cast <bool> (Nodes.size() >= 2) ? void (0) :
 __assert_fail ("Nodes.size() >= 2", "clang/include/clang/AST/ASTImporter.h"
, 171, __extension__ __PRETTY_FUNCTION__));
      return Cycle(Nodes.rbegin(),
                   std::find(Nodes.rbegin() + 1, Nodes.rend(), Nodes.back()) +
                       1);
    }

    /// Returns the copy of the cycle.
    VecTy copyCycleAtBack() const {
      auto R = getCycleAtBack();
      return VecTy(R.begin(), R.end());
    }

  private:
    // All nodes of the path.
    VecTy Nodes;
    // Auxiliary container to be able to answer "Do we have a cycle ending
    // at last element?" as fast as possible.
    // We count each Decl's occurrence over the path.
    llvm::SmallDenseMap<Decl *, int, 32> Aux;
  };

private:
  std::shared_ptr<ASTImporterSharedState> SharedState = nullptr;

  /// The path which we go through during the import of a given AST node.
  ImportPathTy ImportPath;
  /// Sometimes we have to save some part of an import path, so later we can
  /// set up properties to the saved nodes.
  /// We may have several of these import paths associated to one Decl.
  using SavedImportPathsForOneDecl =
      llvm::SmallVector<ImportPathTy::VecTy, 32>;
  using SavedImportPathsTy =
      llvm::SmallDenseMap<Decl *, SavedImportPathsForOneDecl, 32>;
  SavedImportPathsTy SavedImportPaths;

  /// The contexts we're importing to and from.
  ASTContext &ToContext, &FromContext;

  /// The file managers we're importing to and from.
  FileManager &ToFileManager, &FromFileManager;

  /// Whether to perform a minimal import.
  bool Minimal;

  ODRHandlingType ODRHandling;

  /// Whether the last diagnostic came from the "from" context.
  bool LastDiagFromFrom = false;

  /// Mapping from the already-imported types in the "from" context
  /// to the corresponding types in the "to" context.
  llvm::DenseMap<const Type *, const Type *> ImportedTypes;

  /// Mapping from the already-imported declarations in the "from"
  /// context to the corresponding declarations in the "to" context.
  llvm::DenseMap<Decl *, Decl *> ImportedDecls;

  /// Mapping from the already-imported declarations in the "from"
  /// context to the error status of the import of that declaration.
  /// This map contains only the declarations that were not correctly
  /// imported. The same declaration may or may not be included in
  /// ImportedDecls. This map is updated continuously during imports and never
  /// cleared (like ImportedDecls).
  llvm::DenseMap<Decl *, ASTImportError> ImportDeclErrors;

  /// Mapping from the already-imported declarations in the "to"
  /// context to the corresponding declarations in the "from" context.
  llvm::DenseMap<Decl *, Decl *> ImportedFromDecls;

  /// Mapping from the already-imported statements in the "from"
  /// context to the corresponding statements in the "to" context.
  llvm::DenseMap<Stmt *, Stmt *> ImportedStmts;

  /// Mapping from the already-imported FileIDs in the "from" source
  /// manager to the corresponding FileIDs in the "to" source manager.
  llvm::DenseMap<FileID, FileID> ImportedFileIDs;

  /// Mapping from the already-imported CXXBasesSpecifier in
  ///  the "from" source manager to the corresponding CXXBasesSpecifier
  ///  in the "to" source manager.
  ImportedCXXBaseSpecifierMap ImportedCXXBaseSpecifiers;

  /// Declaration (from, to) pairs that are known not to be equivalent
  /// (which we have already complained about).
  NonEquivalentDeclSet NonEquivalentDecls;

  using FoundDeclsTy = SmallVector<NamedDecl *, 2>;
  FoundDeclsTy findDeclsInToCtx(DeclContext *DC, DeclarationName Name);

  void AddToLookupTable(Decl *ToD);
  llvm::Error ImportAttrs(Decl *ToD, Decl *FromD);

protected:
  /// Can be overwritten by subclasses to implement their own import logic.
  /// The overwritten method should call this method if it didn't import the
  /// decl on its own.
  virtual Expected<Decl *> ImportImpl(Decl *From);

  /// Used only in unittests to verify the behaviour of the error handling.
  virtual bool returnWithErrorInTest() { return false; };

public:

  /// \param ToContext The context we'll be importing into.
  ///
  /// \param ToFileManager The file manager we'll be importing into.
  ///
  /// \param FromContext The context we'll be importing from.
  ///
  /// \param FromFileManager The file manager we'll be importing into.
  ///
  /// \param MinimalImport If true, the importer will attempt to import
  /// as little as it can, e.g., by importing declarations as forward
  /// declarations that can be completed at a later point.
  ///
  /// \param SharedState The importer specific lookup table which may be
  /// shared amongst several ASTImporter objects.
  /// If not set then the original C/C++ lookup is used.
  ASTImporter(ASTContext &ToContext, FileManager &ToFileManager,
              ASTContext &FromContext, FileManager &FromFileManager,
              bool MinimalImport,
              std::shared_ptr<ASTImporterSharedState> SharedState = nullptr);

  virtual ~ASTImporter();

  /// Whether the importer will perform a minimal import, creating
  /// to-be-completed forward declarations when possible.
  bool isMinimalImport() const { return Minimal; }

  void setODRHandling(ODRHandlingType T) { ODRHandling = T; }

  /// \brief Import the given object, returns the result.
  ///
  /// \param To Import the object into this variable.
  /// \param From Object to import.
  /// \return Error information (success or error).
  template <typename ImportT>
  [[nodiscard]] llvm::Error importInto(ImportT &To, const ImportT &From) {
    auto ToOrErr = Import(From);
    if (ToOrErr)
9
←
Taking false branch→
      To = *ToOrErr;
    return ToOrErr.takeError();
10
←
Returning without writing to 'To'→
  }

  /// Import cleanup objects owned by ExprWithCleanup.
  llvm::Expected<ExprWithCleanups::CleanupObject>
  Import(ExprWithCleanups::CleanupObject From);

  /// Import the given type from the "from" context into the "to"
  /// context.
  ///
  /// \returns The equivalent type in the "to" context, or the import error.
  llvm::Expected<const Type *> Import(const Type *FromT);

  /// Import the given qualified type from the "from" context into the "to"
  /// context. A null type is imported as a null type (no error).
  ///
  /// \returns The equivalent type in the "to" context, or the import error.
  llvm::Expected<QualType> Import(QualType FromT);

  /// Import the given type source information from the
  /// "from" context into the "to" context.
  ///
  /// \returns The equivalent type source information in the "to"
  /// context, or the import error.
  llvm::Expected<TypeSourceInfo *> Import(TypeSourceInfo *FromTSI);

  /// Import the given attribute from the "from" context into the
  /// "to" context.
  ///
  /// \returns The equivalent attribute in the "to" context, or the import
  /// error.
  llvm::Expected<Attr *> Import(const Attr *FromAttr);

  /// Import the given declaration from the "from" context into the
  /// "to" context.
  ///
  /// \returns The equivalent declaration in the "to" context, or the import
  /// error.
  llvm::Expected<Decl *> Import(Decl *FromD);
  llvm::Expected<const Decl *> Import(const Decl *FromD) {
    return Import(const_cast<Decl *>(FromD));
  }

  llvm::Expected<InheritedConstructor>
  Import(const InheritedConstructor &From);

  /// Return the copy of the given declaration in the "to" context if
  /// it has already been imported from the "from" context.  Otherwise return
  /// nullptr.
  Decl *GetAlreadyImportedOrNull(const Decl *FromD) const;

  /// Return the translation unit from where the declaration was
  /// imported. If it does not exist nullptr is returned.
  TranslationUnitDecl *GetFromTU(Decl *ToD);

  /// Return the declaration in the "from" context from which the declaration
  /// in the "to" context was imported. If it was not imported or of the wrong
  /// type a null value is returned.
  template <typename DeclT>
  std::optional<DeclT *> getImportedFromDecl(const DeclT *ToD) const {
    auto FromI = ImportedFromDecls.find(ToD);
    if (FromI == ImportedFromDecls.end())
      return {};
    auto *FromD = dyn_cast<DeclT>(FromI->second);
    if (!FromD)
      return {};
    return FromD;
  }

  /// Import the given declaration context from the "from"
  /// AST context into the "to" AST context.
  ///
  /// \returns the equivalent declaration context in the "to"
  /// context, or error value.
  llvm::Expected<DeclContext *> ImportContext(DeclContext *FromDC);

  /// Import the given expression from the "from" context into the
  /// "to" context.
  ///
  /// \returns The equivalent expression in the "to" context, or the import
  /// error.
  llvm::Expected<Expr *> Import(Expr *FromE);

  /// Import the given statement from the "from" context into the
  /// "to" context.
  ///
  /// \returns The equivalent statement in the "to" context, or the import
  /// error.
  llvm::Expected<Stmt *> Import(Stmt *FromS);

  /// Import the given nested-name-specifier from the "from"
  /// context into the "to" context.
  ///
  /// \returns The equivalent nested-name-specifier in the "to"
  /// context, or the import error.
  llvm::Expected<NestedNameSpecifier *> Import(NestedNameSpecifier *FromNNS);

  /// Import the given nested-name-specifier-loc from the "from"
  /// context into the "to" context.
  ///
  /// \returns The equivalent nested-name-specifier-loc in the "to"
  /// context, or the import error.
  llvm::Expected<NestedNameSpecifierLoc>
  Import(NestedNameSpecifierLoc FromNNS);

  /// Import the given template name from the "from" context into the
  /// "to" context, or the import error.
  llvm::Expected<TemplateName> Import(TemplateName From);

  /// Import the given source location from the "from" context into
  /// the "to" context.
  ///
  /// \returns The equivalent source location in the "to" context, or the
  /// import error.
  llvm::Expected<SourceLocation> Import(SourceLocation FromLoc);

  /// Import the given source range from the "from" context into
  /// the "to" context.
  ///
  /// \returns The equivalent source range in the "to" context, or the import
  /// error.
  llvm::Expected<SourceRange> Import(SourceRange FromRange);

  /// Import the given declaration name from the "from"
  /// context into the "to" context.
  ///
  /// \returns The equivalent declaration name in the "to" context, or the
  /// import error.
  llvm::Expected<DeclarationName> Import(DeclarationName FromName);

  /// Import the given identifier from the "from" context
  /// into the "to" context.
  ///
  /// \returns The equivalent identifier in the "to" context. Note: It
  /// returns nullptr only if the FromId was nullptr.
  IdentifierInfo *Import(const IdentifierInfo *FromId);

  /// Import the given Objective-C selector from the "from"
  /// context into the "to" context.
  ///
  /// \returns The equivalent selector in the "to" context, or the import
  /// error.
  llvm::Expected<Selector> Import(Selector FromSel);

  /// Import the given file ID from the "from" context into the
  /// "to" context.
  ///
  /// \returns The equivalent file ID in the source manager of the "to"
  /// context, or the import error.
  llvm::Expected<FileID> Import(FileID, bool IsBuiltin = false);

  /// Import the given C++ constructor initializer from the "from"
  /// context into the "to" context.
  ///
  /// \returns The equivalent initializer in the "to" context, or the import
  /// error.
  llvm::Expected<CXXCtorInitializer *> Import(CXXCtorInitializer *FromInit);

  /// Import the given CXXBaseSpecifier from the "from" context into
  /// the "to" context.
  ///
  /// \returns The equivalent CXXBaseSpecifier in the source manager of the
  /// "to" context, or the import error.
  llvm::Expected<CXXBaseSpecifier *> Import(const CXXBaseSpecifier *FromSpec);

  /// Import the given APValue from the "from" context into
  /// the "to" context.
  ///
  /// \return the equivalent APValue in the "to" context or the import
  /// error.
  llvm::Expected<APValue> Import(const APValue &FromValue);

  /// Import the definition of the given declaration, including all of
  /// the declarations it contains.
  [[nodiscard]] llvm::Error ImportDefinition(Decl *From);

  /// Cope with a name conflict when importing a declaration into the
  /// given context.
  ///
  /// This routine is invoked whenever there is a name conflict while
  /// importing a declaration. The returned name will become the name of the
  /// imported declaration. By default, the returned name is the same as the
  /// original name, leaving the conflict unresolve such that name lookup
  /// for this name is likely to find an ambiguity later.
  ///
  /// Subclasses may override this routine to resolve the conflict, e.g., by
  /// renaming the declaration being imported.
  ///
  /// \param Name the name of the declaration being imported, which conflicts
  /// with other declarations.
  ///
  /// \param DC the declaration context (in the "to" AST context) in which
  /// the name is being imported.
  ///
  /// \param IDNS the identifier namespace in which the name will be found.
  ///
  /// \param Decls the set of declarations with the same name as the
  /// declaration being imported.
  ///
  /// \param NumDecls the number of conflicting declarations in \p Decls.
  ///
  /// \returns the name that the newly-imported declaration should have. Or
  /// an error if we can't handle the name conflict.
  virtual Expected<DeclarationName>
  HandleNameConflict(DeclarationName Name, DeclContext *DC, unsigned IDNS,
                     NamedDecl **Decls, unsigned NumDecls);

  /// Retrieve the context that AST nodes are being imported into.
  ASTContext &getToContext() const { return ToContext; }

  /// Retrieve the context that AST nodes are being imported from.
  ASTContext &getFromContext() const { return FromContext; }

  /// Retrieve the file manager that AST nodes are being imported into.
  FileManager &getToFileManager() const { return ToFileManager; }

  /// Retrieve the file manager that AST nodes are being imported from.
  FileManager &getFromFileManager() const { return FromFileManager; }

  /// Report a diagnostic in the "to" context.
  DiagnosticBuilder ToDiag(SourceLocation Loc, unsigned DiagID);

  /// Report a diagnostic in the "from" context.
  DiagnosticBuilder FromDiag(SourceLocation Loc, unsigned DiagID);

  /// Return the set of declarations that we know are not equivalent.
  NonEquivalentDeclSet &getNonEquivalentDecls() { return NonEquivalentDecls; }

  /// Called for ObjCInterfaceDecl, ObjCProtocolDecl, and TagDecl.
  /// Mark the Decl as complete, filling it in as much as possible.
  ///
  /// \param D A declaration in the "to" context.
  virtual void CompleteDecl(Decl* D);

  /// Subclasses can override this function to observe all of the \c From ->
  /// \c To declaration mappings as they are imported.
  virtual void Imported(Decl *From, Decl *To) {}

  void RegisterImportedDecl(Decl *FromD, Decl *ToD);

  /// Store and assign the imported declaration to its counterpart.
  /// It may happen that several decls from the 'from' context are mapped to
  /// the same decl in the 'to' context.
  Decl *MapImported(Decl *From, Decl *To);

  /// Called by StructuralEquivalenceContext.  If a RecordDecl is
  /// being compared to another RecordDecl as part of import, completing the
  /// other RecordDecl may trigger importation of the first RecordDecl. This
  /// happens especially for anonymous structs.  If the original of the second
  /// RecordDecl can be found, we can complete it without the need for
  /// importation, eliminating this loop.
  virtual Decl *GetOriginalDecl(Decl *To) { return nullptr; }

  /// Return if import of the given declaration has failed and if yes
  /// the kind of the problem. This gives the first error encountered with
  /// the node.
  std::optional<ASTImportError> getImportDeclErrorIfAny(Decl *FromD) const;

  /// Mark (newly) imported declaration with error.
  void setImportDeclError(Decl *From, ASTImportError Error);

  /// Determine whether the given types are structurally
  /// equivalent.
  bool IsStructurallyEquivalent(QualType From, QualType To,
                                bool Complain = true);

  /// Determine the index of a field in its parent record.
  /// F should be a field (or indirect field) declaration.
  /// \returns The index of the field in its parent context (starting from 0).
  /// On error `std::nullopt` is returned (parent context is non-record).
  static std::optional<unsigned> getFieldIndex(Decl *F);
};

585} // namespace clang

587#endif // LLVM_CLANG_AST_ASTIMPORTER_H