path: root/lib/AST/ASTImporter.cpp

//===--- ASTImporter.cpp - Importing ASTs from other Contexts ---*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//  This file defines the ASTImporter class which imports AST nodes from one
//  context into another context.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/ASTImporter.h"

#include "clang/AST/ASTContext.h"
#include "clang/AST/ASTDiagnostic.h"
#include "clang/AST/DeclObjC.h"
#include "clang/AST/DeclVisitor.h"
#include "clang/AST/TypeLoc.h"
#include "clang/AST/TypeVisitor.h"
#include "clang/Basic/FileManager.h"
#include "clang/Basic/SourceManager.h"
#include "llvm/Support/MemoryBuffer.h"

using namespace clang;

namespace {
  class ASTNodeImporter : public TypeVisitor<ASTNodeImporter, QualType>,
                          public DeclVisitor<ASTNodeImporter, Decl *> {
    ASTImporter &Importer;
    
  public:
    explicit ASTNodeImporter(ASTImporter &Importer) : Importer(Importer) { }
    
    using TypeVisitor<ASTNodeImporter, QualType>::Visit;
    using DeclVisitor<ASTNodeImporter, Decl *>::Visit;

    // Importing types
    QualType VisitType(Type *T);
    QualType VisitBuiltinType(BuiltinType *T);
    QualType VisitComplexType(ComplexType *T);
    QualType VisitPointerType(PointerType *T);
    QualType VisitBlockPointerType(BlockPointerType *T);
    QualType VisitLValueReferenceType(LValueReferenceType *T);
    QualType VisitRValueReferenceType(RValueReferenceType *T);
    QualType VisitMemberPointerType(MemberPointerType *T);
    QualType VisitConstantArrayType(ConstantArrayType *T);
    QualType VisitIncompleteArrayType(IncompleteArrayType *T);
    QualType VisitVariableArrayType(VariableArrayType *T);
    // FIXME: DependentSizedArrayType
    // FIXME: DependentSizedExtVectorType
    QualType VisitVectorType(VectorType *T);
    QualType VisitExtVectorType(ExtVectorType *T);
    QualType VisitFunctionNoProtoType(FunctionNoProtoType *T);
    QualType VisitFunctionProtoType(FunctionProtoType *T);
    // FIXME: UnresolvedUsingType
    QualType VisitTypedefType(TypedefType *T);
    QualType VisitTypeOfExprType(TypeOfExprType *T);
    // FIXME: DependentTypeOfExprType
    QualType VisitTypeOfType(TypeOfType *T);
    QualType VisitDecltypeType(DecltypeType *T);
    // FIXME: DependentDecltypeType
    QualType VisitRecordType(RecordType *T);
    QualType VisitEnumType(EnumType *T);
    QualType VisitElaboratedType(ElaboratedType *T);
    // FIXME: TemplateTypeParmType
    // FIXME: SubstTemplateTypeParmType
    // FIXME: TemplateSpecializationType
    QualType VisitQualifiedNameType(QualifiedNameType *T);
    // FIXME: TypenameType
    QualType VisitObjCInterfaceType(ObjCInterfaceType *T);
    QualType VisitObjCObjectPointerType(ObjCObjectPointerType *T);
                            
    // Importing declarations
    bool ImportDeclParts(NamedDecl *D, DeclContext *&DC, 
                         DeclContext *&LexicalDC, DeclarationName &Name, 
                         SourceLocation &Loc);                            
    bool ImportDeclParts(DeclaratorDecl *D, 
                         DeclContext *&DC, DeclContext *&LexicalDC,
                         DeclarationName &Name, SourceLocation &Loc, 
                         QualType &T);
    Decl *VisitDecl(Decl *D);
    Decl *VisitTypedefDecl(TypedefDecl *D);
    Decl *VisitFunctionDecl(FunctionDecl *D);
    Decl *VisitVarDecl(VarDecl *D);
    Decl *VisitParmVarDecl(ParmVarDecl *D);
  };
}

//----------------------------------------------------------------------------
// Import Types
//----------------------------------------------------------------------------

QualType ASTNodeImporter::VisitType(Type *T) {
  Importer.FromDiag(SourceLocation(), diag::err_unsupported_ast_node)
    << T->getTypeClassName();
  return QualType();
}

QualType ASTNodeImporter::VisitBuiltinType(BuiltinType *T) {
  switch (T->getKind()) {
  case BuiltinType::Void: return Importer.getToContext().VoidTy;
  case BuiltinType::Bool: return Importer.getToContext().BoolTy;
    
  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().getLangOptions().CharIsSigned)
      return Importer.getToContext().UnsignedCharTy;
    
    return Importer.getToContext().CharTy;

  case BuiltinType::UChar: return Importer.getToContext().UnsignedCharTy;
    
  case BuiltinType::