예제 #1
0
    bool VisitCompoundStmt(CompoundStmt* CS) {
      for(CompoundStmt::body_iterator I = CS->body_begin(), E = CS->body_end();
          I != E; ++I) {
        if (!isa<BinaryOperator>(*I))
          continue;

        const BinaryOperator* BinOp = cast<BinaryOperator>(*I);
        if (isAutoCandidate(BinOp)) {
          ASTContext& C = m_Sema->getASTContext();
          VarDecl* VD 
            = cast<VarDecl>(cast<DeclRefExpr>(BinOp->getLHS())->getDecl());
          TypeSourceInfo* ResTSI = 0;
          TypeSourceInfo* TrivialTSI 
            = C.getTrivialTypeSourceInfo(VD->getType());
          Expr* RHS = BinOp->getRHS();
          m_Sema->DeduceAutoType(TrivialTSI, RHS, ResTSI);
          VD->setTypeSourceInfo(ResTSI);
          VD->setType(ResTSI->getType());
          VD->setInit(RHS);
          Sema::DeclGroupPtrTy VDPtrTy = m_Sema->ConvertDeclToDeclGroup(VD);
          // Transform the AST into a "sane" state. Replace the binary operator
          // with decl stmt, because the binop semantically is a decl with init.
          StmtResult DS = m_Sema->ActOnDeclStmt(VDPtrTy, BinOp->getLocStart(), 
                                                BinOp->getLocEnd());
          assert(!DS.isInvalid() && "Invalid DeclStmt.");
          *I = DS.take();
        }
      }
      return true; // returning false will abort the in-depth traversal.
    }
예제 #2
0
파일: ODRHash.cpp 프로젝트: etejedor/root
 void VisitFriendDecl(const FriendDecl *D) {
   TypeSourceInfo *TSI = D->getFriendType();
   Hash.AddBoolean(TSI);
   if (TSI) {
     AddQualType(TSI->getType());
   } else {
     AddDecl(D->getFriendDecl());
   }
 }
예제 #3
0
TypeResult Sema::ActOnPackExpansion(ParsedType Type,
                                    SourceLocation EllipsisLoc) {
  TypeSourceInfo *TSInfo;
  GetTypeFromParser(Type, &TSInfo);
  if (!TSInfo)
    return true;

  TypeSourceInfo *TSResult = CheckPackExpansion(TSInfo, EllipsisLoc, None);
  if (!TSResult)
    return true;

  return CreateParsedType(TSResult->getType(), TSResult);
}
예제 #4
0
파일: CXCursor.cpp 프로젝트: nicolaisi/root
CXCursor cxcursor::getTypeRefCursor(CXCursor cursor) {
    if (cursor.kind != CXCursor_CallExpr)
        return cursor;

    if (cursor.xdata == 0)
        return cursor;

    const Expr *E = getCursorExpr(cursor);
    TypeSourceInfo *Type = 0;
    if (const CXXUnresolvedConstructExpr *
            UnCtor = dyn_cast<CXXUnresolvedConstructExpr>(E)) {
        Type = UnCtor->getTypeSourceInfo();
    } else if (const CXXTemporaryObjectExpr *Tmp =
                   dyn_cast<CXXTemporaryObjectExpr>(E)) {
        Type = Tmp->getTypeSourceInfo();
    }

    if (!Type)
        return cursor;

    CXTranslationUnit TU = getCursorTU(cursor);
    QualType Ty = Type->getType();
    TypeLoc TL = Type->getTypeLoc();
    SourceLocation Loc = TL.getBeginLoc();

    if (const ElaboratedType *ElabT = Ty->getAs<ElaboratedType>()) {
        Ty = ElabT->getNamedType();
        ElaboratedTypeLoc ElabTL = TL.castAs<ElaboratedTypeLoc>();
        Loc = ElabTL.getNamedTypeLoc().getBeginLoc();
    }

    if (const TypedefType *Typedef = Ty->getAs<TypedefType>())
        return MakeCursorTypeRef(Typedef->getDecl(), Loc, TU);
    if (const TagType *Tag = Ty->getAs<TagType>())
        return MakeCursorTypeRef(Tag->getDecl(), Loc, TU);
    if (const TemplateTypeParmType *TemplP = Ty->getAs<TemplateTypeParmType>())
        return MakeCursorTypeRef(TemplP->getDecl(), Loc, TU);

    return cursor;
}
  Expr* ValueExtractionSynthesizer::SynthesizeSVRInit(Expr* E) {
    if (!m_gClingVD)
      FindAndCacheRuntimeDecls();

    // Build a reference to gCling
    ExprResult gClingDRE
      = m_Sema->BuildDeclRefExpr(m_gClingVD, m_Context->VoidPtrTy,
                                 VK_RValue, SourceLocation());
    // We have the wrapper as Sema's CurContext
    FunctionDecl* FD = cast<FunctionDecl>(m_Sema->CurContext);

    ExprWithCleanups* Cleanups = 0;
    // In case of ExprWithCleanups we need to extend its 'scope' to the call.
    if (E && isa<ExprWithCleanups>(E)) {
      Cleanups = cast<ExprWithCleanups>(E);
      E = Cleanups->getSubExpr();
    }

    // Build a reference to Value* in the wrapper, should be
    // the only argument of the wrapper.
    SourceLocation locStart = (E) ? E->getLocStart() : FD->getLocStart();
    SourceLocation locEnd = (E) ? E->getLocEnd() : FD->getLocEnd();
    ExprResult wrapperSVRDRE
      = m_Sema->BuildDeclRefExpr(FD->getParamDecl(0), m_Context->VoidPtrTy,
                                 VK_RValue, locStart);
    QualType ETy = (E) ? E->getType() : m_Context->VoidTy;
    QualType desugaredTy = ETy.getDesugaredType(*m_Context);

    // The expr result is transported as reference, pointer, array, float etc
    // based on the desugared type. We should still expose the typedef'ed
    // (sugared) type to the cling::Value.
    if (desugaredTy->isRecordType() && E->getValueKind() == VK_LValue) {
      // returning a lvalue (not a temporary): the value should contain
      // a reference to the lvalue instead of copying it.
      desugaredTy = m_Context->getLValueReferenceType(desugaredTy);
      ETy = m_Context->getLValueReferenceType(ETy);
    }
    Expr* ETyVP
      = utils::Synthesize::CStyleCastPtrExpr(m_Sema, m_Context->VoidPtrTy,
                                             (uint64_t)ETy.getAsOpaquePtr());
    Expr* ETransaction
      = utils::Synthesize::CStyleCastPtrExpr(m_Sema, m_Context->VoidPtrTy,
                                             (uint64_t)getTransaction());

    llvm::SmallVector<Expr*, 6> CallArgs;
    CallArgs.push_back(gClingDRE.take());
    CallArgs.push_back(wrapperSVRDRE.take());
    CallArgs.push_back(ETyVP);
    CallArgs.push_back(ETransaction);

    ExprResult Call;
    SourceLocation noLoc;
    if (desugaredTy->isVoidType()) {
      // In cases where the cling::Value gets reused we need to reset the
      // previous settings to void.
      // We need to synthesize setValueNoAlloc(...), E, because we still need
      // to run E.

      // FIXME: Suboptimal: this discards the already created AST nodes.
      QualType vpQT = m_Context->VoidPtrTy;
      QualType vQT = m_Context->VoidTy;
      Expr* vpQTVP
        = utils::Synthesize::CStyleCastPtrExpr(m_Sema, vpQT,
                                               (uint64_t)vQT.getAsOpaquePtr());
      CallArgs[2] = vpQTVP;


      Call = m_Sema->ActOnCallExpr(/*Scope*/0, m_UnresolvedNoAlloc,
                                   locStart, CallArgs, locEnd);

      if (E)
        Call = m_Sema->CreateBuiltinBinOp(locStart, BO_Comma, Call.take(), E);

    }
    else if (desugaredTy->isRecordType() || desugaredTy->isConstantArrayType()){
      // 2) object types :
      // check existance of copy constructor before call
      if (!availableCopyConstructor(desugaredTy, m_Sema))
        return E;
      // call new (setValueWithAlloc(gCling, &SVR, ETy)) (E)
      Call = m_Sema->ActOnCallExpr(/*Scope*/0, m_UnresolvedWithAlloc,
                                   locStart, CallArgs, locEnd);
      Expr* placement = Call.take();
      if (const ConstantArrayType* constArray
          = dyn_cast<ConstantArrayType>(desugaredTy.getTypePtr())) {
        CallArgs.clear();
        CallArgs.push_back(E);
        CallArgs.push_back(placement);
        uint64_t arrSize
          = m_Context->getConstantArrayElementCount(constArray);
        Expr* arrSizeExpr
          = utils::Synthesize::IntegerLiteralExpr(*m_Context, arrSize);

        CallArgs.push_back(arrSizeExpr);
        // 2.1) arrays:
        // call copyArray(T* src, void* placement, int size)
        Call = m_Sema->ActOnCallExpr(/*Scope*/0, m_UnresolvedCopyArray,
                                     locStart, CallArgs, locEnd);

      }
      else {
        TypeSourceInfo* ETSI
          = m_Context->getTrivialTypeSourceInfo(ETy, noLoc);

        Call = m_Sema->BuildCXXNew(E->getSourceRange(),
                                   /*useGlobal ::*/true,
                                   /*placementLParen*/ noLoc,
                                   MultiExprArg(placement),
                                   /*placementRParen*/ noLoc,
                                   /*TypeIdParens*/ SourceRange(),
                                   /*allocType*/ ETSI->getType(),
                                   /*allocTypeInfo*/ETSI,
                                   /*arraySize*/0,
                                   /*directInitRange*/E->getSourceRange(),
                                   /*initializer*/E,
                                   /*mayContainAuto*/false
                                   );
      }
    }
    else if (desugaredTy->isIntegralOrEnumerationType()
             || desugaredTy->isReferenceType()
             || desugaredTy->isPointerType()
             || desugaredTy->isFloatingType()) {
      if (desugaredTy->isIntegralOrEnumerationType()) {
        // 1)  enum, integral, float, double, referece, pointer types :
        //      call to cling::internal::setValueNoAlloc(...);

        // If the type is enum or integral we need to force-cast it into
        // uint64 in order to pick up the correct overload.
        if (desugaredTy->isIntegralOrEnumerationType()) {
          QualType UInt64Ty = m_Context->UnsignedLongLongTy;
          TypeSourceInfo* TSI
            = m_Context->getTrivialTypeSourceInfo(UInt64Ty, noLoc);
          Expr* castedE
            = m_Sema->BuildCStyleCastExpr(noLoc, TSI, noLoc, E).take();
          CallArgs.push_back(castedE);
        }
      }
      else if (desugaredTy->isReferenceType()) {
        // we need to get the address of the references
        Expr* AddrOfE = m_Sema->BuildUnaryOp(/*Scope*/0, noLoc, UO_AddrOf,
                                             E).take();
        CallArgs.push_back(AddrOfE);
      }
      else if (desugaredTy->isPointerType()) {
        // function pointers need explicit void* cast.
        QualType VoidPtrTy = m_Context->VoidPtrTy;
        TypeSourceInfo* TSI
          = m_Context->getTrivialTypeSourceInfo(VoidPtrTy, noLoc);
        Expr* castedE
          = m_Sema->BuildCStyleCastExpr(noLoc, TSI, noLoc, E).take();
        CallArgs.push_back(castedE);
      }
      else if (desugaredTy->isFloatingType()) {
        // floats and double will fall naturally in the correct
        // case, because of the overload resolution.
        CallArgs.push_back(E);
      }
      Call = m_Sema->ActOnCallExpr(/*Scope*/0, m_UnresolvedNoAlloc,
                                   locStart, CallArgs, locEnd);
    }
    else
      assert(0 && "Unhandled code path?");

    assert(!Call.isInvalid() && "Invalid Call");

    // Extend the scope of the temporary cleaner if applicable.
    if (Cleanups) {
      Cleanups->setSubExpr(Call.take());
      Cleanups->setValueKind(Call.take()->getValueKind());
      Cleanups->setType(Call.take()->getType());
      return Cleanups;
    }
    return Call.take();
  }
예제 #6
0
void Sema::ActOnStartOfLambdaDefinition(LambdaIntroducer &Intro,
                                        Declarator &ParamInfo,
                                        Scope *CurScope) {
  // Determine if we're within a context where we know that the lambda will
  // be dependent, because there are template parameters in scope.
  bool KnownDependent = false;
  if (Scope *TmplScope = CurScope->getTemplateParamParent())
    if (!TmplScope->decl_empty())
      KnownDependent = true;
  
  CXXRecordDecl *Class = createLambdaClosureType(Intro.Range, KnownDependent);
  
  // Determine the signature of the call operator.
  TypeSourceInfo *MethodTyInfo;
  bool ExplicitParams = true;
  bool ExplicitResultType = true;
  bool ContainsUnexpandedParameterPack = false;
  SourceLocation EndLoc;
  llvm::ArrayRef<ParmVarDecl *> Params;
  if (ParamInfo.getNumTypeObjects() == 0) {
    // C++11 [expr.prim.lambda]p4:
    //   If a lambda-expression does not include a lambda-declarator, it is as 
    //   if the lambda-declarator were ().
    FunctionProtoType::ExtProtoInfo EPI;
    EPI.HasTrailingReturn = true;
    EPI.TypeQuals |= DeclSpec::TQ_const;
    QualType MethodTy = Context.getFunctionType(Context.DependentTy,
                                                /*Args=*/0, /*NumArgs=*/0, EPI);
    MethodTyInfo = Context.getTrivialTypeSourceInfo(MethodTy);
    ExplicitParams = false;
    ExplicitResultType = false;
    EndLoc = Intro.Range.getEnd();
  } else {
    assert(ParamInfo.isFunctionDeclarator() &&
           "lambda-declarator is a function");
    DeclaratorChunk::FunctionTypeInfo &FTI = ParamInfo.getFunctionTypeInfo();
    
    // C++11 [expr.prim.lambda]p5:
    //   This function call operator is declared const (9.3.1) if and only if 
    //   the lambda-expression's parameter-declaration-clause is not followed 
    //   by mutable. It is neither virtual nor declared volatile. [...]
    if (!FTI.hasMutableQualifier())
      FTI.TypeQuals |= DeclSpec::TQ_const;
    
    MethodTyInfo = GetTypeForDeclarator(ParamInfo, CurScope);
    assert(MethodTyInfo && "no type from lambda-declarator");
    EndLoc = ParamInfo.getSourceRange().getEnd();
    
    ExplicitResultType
      = MethodTyInfo->getType()->getAs<FunctionType>()->getResultType() 
                                                        != Context.DependentTy;
    
    TypeLoc TL = MethodTyInfo->getTypeLoc();
    FunctionProtoTypeLoc Proto = cast<FunctionProtoTypeLoc>(TL);
    Params = llvm::ArrayRef<ParmVarDecl *>(Proto.getParmArray(), 
                                           Proto.getNumArgs());

    // Check for unexpanded parameter packs in the method type.
    if (MethodTyInfo->getType()->containsUnexpandedParameterPack())
      ContainsUnexpandedParameterPack = true;
  }
  
  CXXMethodDecl *Method = startLambdaDefinition(Class, Intro.Range,
                                                MethodTyInfo, EndLoc, Params);
  
  if (ExplicitParams)
    CheckCXXDefaultArguments(Method);
  
  // Attributes on the lambda apply to the method.  
  ProcessDeclAttributes(CurScope, Method, ParamInfo);
  
  // Introduce the function call operator as the current declaration context.
  PushDeclContext(CurScope, Method);
    
  // Introduce the lambda scope.
  LambdaScopeInfo *LSI
    = enterLambdaScope(Method, Intro.Range, Intro.Default, ExplicitParams,
                       ExplicitResultType,
                       (Method->getTypeQualifiers() & Qualifiers::Const) == 0);
 
  // Handle explicit captures.
  SourceLocation PrevCaptureLoc
    = Intro.Default == LCD_None? Intro.Range.getBegin() : Intro.DefaultLoc;
  for (llvm::SmallVector<LambdaCapture, 4>::const_iterator
         C = Intro.Captures.begin(), 
         E = Intro.Captures.end(); 
       C != E; 
       PrevCaptureLoc = C->Loc, ++C) {
    if (C->Kind == LCK_This) {
      // C++11 [expr.prim.lambda]p8:
      //   An identifier or this shall not appear more than once in a 
      //   lambda-capture.
      if (LSI->isCXXThisCaptured()) {
        Diag(C->Loc, diag::err_capture_more_than_once) 
          << "'this'"
          << SourceRange(LSI->getCXXThisCapture().getLocation())
          << FixItHint::CreateRemoval(
               SourceRange(PP.getLocForEndOfToken(PrevCaptureLoc), C->Loc));
        continue;
      }

      // C++11 [expr.prim.lambda]p8:
      //   If a lambda-capture includes a capture-default that is =, the 
      //   lambda-capture shall not contain this [...].
      if (Intro.Default == LCD_ByCopy) {
        Diag(C->Loc, diag::err_this_capture_with_copy_default)
          << FixItHint::CreateRemoval(
               SourceRange(PP.getLocForEndOfToken(PrevCaptureLoc), C->Loc));
        continue;
      }

      // C++11 [expr.prim.lambda]p12:
      //   If this is captured by a local lambda expression, its nearest
      //   enclosing function shall be a non-static member function.
      QualType ThisCaptureType = getCurrentThisType();
      if (ThisCaptureType.isNull()) {
        Diag(C->Loc, diag::err_this_capture) << true;
        continue;
      }
      
      CheckCXXThisCapture(C->Loc, /*Explicit=*/true);
      continue;
    }

    assert(C->Id && "missing identifier for capture");

    // C++11 [expr.prim.lambda]p8:
    //   If a lambda-capture includes a capture-default that is &, the 
    //   identifiers in the lambda-capture shall not be preceded by &.
    //   If a lambda-capture includes a capture-default that is =, [...]
    //   each identifier it contains shall be preceded by &.
    if (C->Kind == LCK_ByRef && Intro.Default == LCD_ByRef) {
      Diag(C->Loc, diag::err_reference_capture_with_reference_default)
        << FixItHint::CreateRemoval(
             SourceRange(PP.getLocForEndOfToken(PrevCaptureLoc), C->Loc));
      continue;
    } else if (C->Kind == LCK_ByCopy && Intro.Default == LCD_ByCopy) {
      Diag(C->Loc, diag::err_copy_capture_with_copy_default)
        << FixItHint::CreateRemoval(
             SourceRange(PP.getLocForEndOfToken(PrevCaptureLoc), C->Loc));
      continue;
    }

    DeclarationNameInfo Name(C->Id, C->Loc);
    LookupResult R(*this, Name, LookupOrdinaryName);
    LookupName(R, CurScope);
    if (R.isAmbiguous())
      continue;
    if (R.empty()) {
      // FIXME: Disable corrections that would add qualification?
      CXXScopeSpec ScopeSpec;
      DeclFilterCCC<VarDecl> Validator;
      if (DiagnoseEmptyLookup(CurScope, ScopeSpec, R, Validator))
        continue;
    }

    // C++11 [expr.prim.lambda]p10:
    //   The identifiers in a capture-list are looked up using the usual rules
    //   for unqualified name lookup (3.4.1); each such lookup shall find a 
    //   variable with automatic storage duration declared in the reaching 
    //   scope of the local lambda expression.
    // 
    // Note that the 'reaching scope' check happens in tryCaptureVariable().
    VarDecl *Var = R.getAsSingle<VarDecl>();
    if (!Var) {
      Diag(C->Loc, diag::err_capture_does_not_name_variable) << C->Id;
      continue;
    }

    if (!Var->hasLocalStorage()) {
      Diag(C->Loc, diag::err_capture_non_automatic_variable) << C->Id;
      Diag(Var->getLocation(), diag::note_previous_decl) << C->Id;
      continue;
    }

    // C++11 [expr.prim.lambda]p8:
    //   An identifier or this shall not appear more than once in a 
    //   lambda-capture.
    if (LSI->isCaptured(Var)) {
      Diag(C->Loc, diag::err_capture_more_than_once) 
        << C->Id
        << SourceRange(LSI->getCapture(Var).getLocation())
        << FixItHint::CreateRemoval(
             SourceRange(PP.getLocForEndOfToken(PrevCaptureLoc), C->Loc));
      continue;
    }

    // C++11 [expr.prim.lambda]p23:
    //   A capture followed by an ellipsis is a pack expansion (14.5.3).
    SourceLocation EllipsisLoc;
    if (C->EllipsisLoc.isValid()) {
      if (Var->isParameterPack()) {
        EllipsisLoc = C->EllipsisLoc;
      } else {
        Diag(C->EllipsisLoc, diag::err_pack_expansion_without_parameter_packs)
          << SourceRange(C->Loc);
        
        // Just ignore the ellipsis.
      }
    } else if (Var->isParameterPack()) {
      ContainsUnexpandedParameterPack = true;
    }
    
    TryCaptureKind Kind = C->Kind == LCK_ByRef ? TryCapture_ExplicitByRef :
                                                 TryCapture_ExplicitByVal;
    tryCaptureVariable(Var, C->Loc, Kind, EllipsisLoc);
  }
  finishLambdaExplicitCaptures(LSI);

  LSI->ContainsUnexpandedParameterPack = ContainsUnexpandedParameterPack;

  // Add lambda parameters into scope.
  addLambdaParameters(Method, CurScope);

  // Enter a new evaluation context to insulate the lambda from any
  // cleanups from the enclosing full-expression.
  PushExpressionEvaluationContext(PotentiallyEvaluated);  
}
예제 #7
0
static void checkAllAtProps(MigrationContext &MigrateCtx,
                            SourceLocation AtLoc,
                            IndivPropsTy &IndProps) {
  if (IndProps.empty())
    return;

  for (IndivPropsTy::iterator
         PI = IndProps.begin(), PE = IndProps.end(); PI != PE; ++PI) {
    QualType T = (*PI)->getType();
    if (T.isNull() || !T->isObjCRetainableType())
      return;
  }

  SmallVector<std::pair<AttributedTypeLoc, ObjCPropertyDecl *>, 4> ATLs;
  bool hasWeak = false, hasStrong = false;
  ObjCPropertyDecl::PropertyAttributeKind
    Attrs = ObjCPropertyDecl::OBJC_PR_noattr;
  for (IndivPropsTy::iterator
         PI = IndProps.begin(), PE = IndProps.end(); PI != PE; ++PI) {
    ObjCPropertyDecl *PD = *PI;
    Attrs = PD->getPropertyAttributesAsWritten();
    TypeSourceInfo *TInfo = PD->getTypeSourceInfo();
    if (!TInfo)
      return;
    TypeLoc TL = TInfo->getTypeLoc();
    if (AttributedTypeLoc ATL =
            TL.getAs<AttributedTypeLoc>()) {
      ATLs.push_back(std::make_pair(ATL, PD));
      if (TInfo->getType().getObjCLifetime() == Qualifiers::OCL_Weak) {
        hasWeak = true;
      } else if (TInfo->getType().getObjCLifetime() == Qualifiers::OCL_Strong)
        hasStrong = true;
      else
        return;
    }
  }
  if (ATLs.empty())
    return;
  if (hasWeak && hasStrong)
    return;

  TransformActions &TA = MigrateCtx.Pass.TA;
  Transaction Trans(TA);

  if (GCAttrsCollector::hasObjCImpl(
                              cast<Decl>(IndProps.front()->getDeclContext()))) {
    if (hasWeak)
      MigrateCtx.AtPropsWeak.insert(AtLoc.getRawEncoding());

  } else {
    StringRef toAttr = "strong";
    if (hasWeak) {
      if (canApplyWeak(MigrateCtx.Pass.Ctx, IndProps.front()->getType(),
                       /*AllowOnUnkwownClass=*/true))
        toAttr = "weak";
      else
        toAttr = "unsafe_unretained";
    }
    if (Attrs & ObjCPropertyDecl::OBJC_PR_assign)
      MigrateCtx.rewritePropertyAttribute("assign", toAttr, AtLoc);
    else
      MigrateCtx.addPropertyAttribute(toAttr, AtLoc);
  }

  for (unsigned i = 0, e = ATLs.size(); i != e; ++i) {
    SourceLocation Loc = ATLs[i].first.getAttrNameLoc();
    if (Loc.isMacroID())
      Loc = MigrateCtx.Pass.Ctx.getSourceManager()
                                         .getImmediateExpansionRange(Loc).first;
    TA.remove(Loc);
    TA.clearDiagnostic(diag::err_objc_property_attr_mutually_exclusive, AtLoc);
    TA.clearDiagnostic(diag::err_arc_inconsistent_property_ownership,
                       ATLs[i].second->getLocation());
    MigrateCtx.RemovedAttrSet.insert(Loc.getRawEncoding());
  }
}
예제 #8
0
파일: DeclCXX.cpp 프로젝트: CPFL/guc
void
CXXRecordDecl::setBases(CXXBaseSpecifier const * const *Bases,
                        unsigned NumBases) {
  ASTContext &C = getASTContext();
  
  // C++ [dcl.init.aggr]p1:
  //   An aggregate is an array or a class (clause 9) with [...]
  //   no base classes [...].
  data().Aggregate = false;

  if (data().Bases)
    C.Deallocate(data().Bases);

  // The set of seen virtual base types.
  llvm::SmallPtrSet<CanQualType, 8> SeenVBaseTypes;
  
  // The virtual bases of this class.
  llvm::SmallVector<const CXXBaseSpecifier *, 8> VBases;

  data().Bases = new(C) CXXBaseSpecifier [NumBases];
  data().NumBases = NumBases;
  for (unsigned i = 0; i < NumBases; ++i) {
    data().Bases[i] = *Bases[i];
    // Keep track of inherited vbases for this base class.
    const CXXBaseSpecifier *Base = Bases[i];
    QualType BaseType = Base->getType();
    // Skip dependent types; we can't do any checking on them now.
    if (BaseType->isDependentType())
      continue;
    CXXRecordDecl *BaseClassDecl
      = cast<CXXRecordDecl>(BaseType->getAs<RecordType>()->getDecl());

    // Now go through all virtual bases of this base and add them.
    for (CXXRecordDecl::base_class_iterator VBase =
          BaseClassDecl->vbases_begin(),
         E = BaseClassDecl->vbases_end(); VBase != E; ++VBase) {
      // Add this base if it's not already in the list.
      if (SeenVBaseTypes.insert(C.getCanonicalType(VBase->getType())))
        VBases.push_back(VBase);
    }

    if (Base->isVirtual()) {
      // Add this base if it's not already in the list.
      if (SeenVBaseTypes.insert(C.getCanonicalType(BaseType)))
          VBases.push_back(Base);
    }

  }
  
  if (VBases.empty())
    return;

  // Create base specifier for any direct or indirect virtual bases.
  data().VBases = new (C) CXXBaseSpecifier[VBases.size()];
  data().NumVBases = VBases.size();
  for (int I = 0, E = VBases.size(); I != E; ++I) {
    TypeSourceInfo *VBaseTypeInfo = VBases[I]->getTypeSourceInfo();

    // Skip dependent types; we can't do any checking on them now.
    if (VBaseTypeInfo->getType()->isDependentType())
      continue;

    CXXRecordDecl *VBaseClassDecl = cast<CXXRecordDecl>(
      VBaseTypeInfo->getType()->getAs<RecordType>()->getDecl());

    data().VBases[I] =
      CXXBaseSpecifier(VBaseClassDecl->getSourceRange(), true,
                       VBaseClassDecl->getTagKind() == TTK_Class,
                       VBases[I]->getAccessSpecifier(), VBaseTypeInfo);
  }
}