Exemplo n.º 1
0
        private static bool MatchAttributeTarget(IAttributeTargetSymbol attributeTarget, AttributeLocation symbolPart, AttributeTargetSpecifierSyntax targetOpt, DiagnosticBag diagnostics)
        {
            IAttributeTargetSymbol attributesOwner = attributeTarget.AttributesOwner;

            // Determine if the target symbol owns the attribute declaration.
            // We need to report diagnostics only once, so do it when visiting attributes for the owner.
            bool isOwner = symbolPart == AttributeLocation.None && ReferenceEquals(attributesOwner, attributeTarget);

            if (targetOpt == null)
            {
                // only attributes with an explicit target match if the symbol doesn't own the attributes:
                return(isOwner);
            }

            AttributeLocation allowedTargets = attributesOwner.AllowedAttributeLocations;

            AttributeLocation explicitTarget = targetOpt.GetAttributeLocation();

            if (explicitTarget == AttributeLocation.None)
            {
                // error: unknown attribute location
                if (isOwner)
                {
                    //NOTE: ValueText so that we accept targets like "@return", to match dev10 (DevDiv #2591).
                    diagnostics.Add(ErrorCode.WRN_InvalidAttributeLocation,
                                    targetOpt.Identifier.GetLocation(), targetOpt.Identifier.ValueText, allowedTargets.ToDisplayString());
                }

                return(false);
            }

            if ((explicitTarget & allowedTargets) == 0)
            {
                // error: invalid target for symbol
                if (isOwner)
                {
                    if (allowedTargets == AttributeLocation.None)
                    {
                        switch (attributeTarget.DefaultAttributeLocation)
                        {
                        case AttributeLocation.Assembly:
                        case AttributeLocation.Module:
                            // global attributes are disallowed in interactive code:
                            diagnostics.Add(ErrorCode.ERR_GlobalAttributesNotAllowed, targetOpt.Identifier.GetLocation());
                            break;

                        default:
                            // currently this can't happen
                            throw ExceptionUtilities.UnexpectedValue(attributeTarget.DefaultAttributeLocation);
                        }
                    }
                    else
                    {
                        diagnostics.Add(ErrorCode.WRN_AttributeLocationOnBadDeclaration,
                                        targetOpt.Identifier.GetLocation(), targetOpt.Identifier.ToString(), allowedTargets.ToDisplayString());
                    }
                }

                return(false);
            }

            if (symbolPart == AttributeLocation.None)
            {
                return(explicitTarget == attributeTarget.DefaultAttributeLocation);
            }
            else
            {
                return(explicitTarget == symbolPart);
            }
        }
Exemplo n.º 2
0
        private static bool MatchAttributeTarget(IAttributeTargetSymbol attributeTarget, AttributeLocation symbolPart, AttributeTargetSpecifierSyntax targetOpt, DiagnosticBag diagnostics)
        {
            IAttributeTargetSymbol attributesOwner = attributeTarget.AttributesOwner;

            // Determine if the target symbol owns the attribute declaration. 
            // We need to report diagnostics only once, so do it when visiting attributes for the owner.
            bool isOwner = symbolPart == AttributeLocation.None && ReferenceEquals(attributesOwner, attributeTarget);

            if (targetOpt == null)
            {
                // only attributes with an explicit target match if the symbol doesn't own the attributes:
                return isOwner;
            }

            AttributeLocation explicitTarget = targetOpt.GetAttributeLocation();
            if (explicitTarget == AttributeLocation.None)
            {
                // error: unknown attribute location
                if (isOwner)
                {
                    //NOTE: ValueText so that we accept targets like "@return", to match dev10 (DevDiv #2591).
                    diagnostics.Add(ErrorCode.WRN_InvalidAttributeLocation,
                        targetOpt.Identifier.GetLocation(), targetOpt.Identifier.ValueText);
                }

                return false;
            }

            AttributeLocation allowedTargets = attributesOwner.AllowedAttributeLocations;
            if ((explicitTarget & allowedTargets) == 0)
            {
                // error: invalid target for symbol
                if (isOwner)
                {
                    if (allowedTargets == AttributeLocation.None)
                    {
                        switch (attributeTarget.DefaultAttributeLocation)
                        {
                            case AttributeLocation.Assembly:
                            case AttributeLocation.Module:
                                // global attributes are disallowed in interactive code:
                                diagnostics.Add(ErrorCode.ERR_GlobalAttributesNotAllowed, targetOpt.Identifier.GetLocation());
                                break;

                            default:
                                // currently this can't happen
                                throw ExceptionUtilities.UnexpectedValue(attributeTarget.DefaultAttributeLocation);
                        }
                    }
                    else
                    {
                        diagnostics.Add(ErrorCode.WRN_AttributeLocationOnBadDeclaration,
                            targetOpt.Identifier.GetLocation(), targetOpt.Identifier.ToString(), allowedTargets.ToDisplayString());
                    }
                }

                return false;
            }

            if (symbolPart == AttributeLocation.None)
            {
                return explicitTarget == attributeTarget.DefaultAttributeLocation;
            }
            else
            {
                return explicitTarget == symbolPart;
            }
        }