Ejemplo n.º 1
0
Archivo: Utils.cpp Proyecto: KDE/clazy
bool Utils::containsNonConstMemberCall(Stmt *body, const VarDecl *varDecl)
{
    std::vector<CXXMemberCallExpr*> memberCalls;
    HierarchyUtils::getChilds<CXXMemberCallExpr>(body, memberCalls);

    for (CXXMemberCallExpr *memberCall : memberCalls) {
        CXXMethodDecl *methodDecl = memberCall->getMethodDecl();
        if (!methodDecl || methodDecl->isConst())
            continue;

        ValueDecl *valueDecl = Utils::valueDeclForMemberCall(memberCall);
        if (!valueDecl)
            continue;

        if (valueDecl == varDecl)
            return true;
    }

    // Check for operator calls:
    std::vector<CXXOperatorCallExpr*> operatorCalls;
    HierarchyUtils::getChilds<CXXOperatorCallExpr>(body, operatorCalls);
    for (CXXOperatorCallExpr *operatorExpr : operatorCalls) {
        FunctionDecl *fDecl = operatorExpr->getDirectCallee();
        if (!fDecl)
            continue;
        CXXMethodDecl *methodDecl = dyn_cast<CXXMethodDecl>(fDecl);
        if (methodDecl == nullptr || methodDecl->isConst())
            continue;

        ValueDecl *valueDecl = Utils::valueDeclForOperatorCall(operatorExpr);
        if (!valueDecl)
            continue;

        if (valueDecl == varDecl)
            return true;
    }

    return false;
}
Ejemplo n.º 2
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;
  
  // Determine the signature of the call operator.
  TypeSourceInfo *MethodTyInfo;
  bool ExplicitParams = true;
  bool ExplicitResultType = true;
  bool ContainsUnexpandedParameterPack = false;
  SourceLocation EndLoc;
  SmallVector<ParmVarDecl *, 8> 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, None,
                                                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;

    if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 &&
        cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) {
      // Empty arg list, don't push any params.
      checkVoidParamDecl(cast<ParmVarDecl>(FTI.ArgInfo[0].Param));
    } else {
      Params.reserve(FTI.NumArgs);
      for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i)
        Params.push_back(cast<ParmVarDecl>(FTI.ArgInfo[i].Param));
    }

    // Check for unexpanded parameter packs in the method type.
    if (MethodTyInfo->getType()->containsUnexpandedParameterPack())
      ContainsUnexpandedParameterPack = true;
  }

  CXXRecordDecl *Class = createLambdaClosureType(Intro.Range, MethodTyInfo,
                                                 KnownDependent);

  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->isConst());
 
  // Handle explicit captures.
  SourceLocation PrevCaptureLoc
    = Intro.Default == LCD_None? Intro.Range.getBegin() : Intro.DefaultLoc;
  for (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;
    }

    // FIXME: C++1y [expr.prim.lambda]p11
    if (C->Init.isInvalid())
      continue;
    if (C->Init.isUsable()) {
      Diag(C->Loc, diag::err_lambda_init_capture_unsupported);
      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;
    }

    // Ignore invalid decls; they'll just confuse the code later.
    if (Var->isInvalidDecl())
      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);  
}