/// <summary>
/// Verify if the attribute type can be applied to given owner symbol.
/// Generate a diagnostic if it cannot be applied
/// </summary>
/// <param name="ownerSymbol">Symbol on which the attribute is applied</param>
/// <param name="attributeType">Attribute class for the attribute</param>
/// <param name="node">Syntax node for attribute specification</param>
/// <param name="attributeLocation">Attribute target specifier location</param>
/// <param name="diagnostics">Diagnostics</param>
/// <returns>Whether attribute specification is allowed for the given symbol</returns>
internal bool VerifyAttributeUsageTarget(Symbol ownerSymbol, NamedTypeSymbol attributeType, AttributeSyntax node, AttributeLocation attributeLocation, DiagnosticBag diagnostics)
{
var attributeUsageInfo = attributeType.AttributeUsageInfo(Compilation);
if (attributeUsageInfo != null)
{
AttributeTargets attributeTarget;
if (attributeLocation == AttributeLocation.Return)
{
// attribute on return type
attributeTarget = AttributeTargets.ReturnValue;
}
else
{
attributeTarget = ownerSymbol.GetAttributeTarget();
}
if ((attributeTarget & attributeUsageInfo.ValidTargets) != 0)
{
return true;
}
// generate error
Error(diagnostics, ErrorCode.ERR_AttributeOnBadSymbolType, node, GetAttributeNameFromSyntax(node), attributeUsageInfo.GetValidTargetsString());
}
return false;
}
/// <summary>
/// Verify if the attribute type can be applied to given owner symbol.
/// Generate a diagnostic if it cannot be applied
/// </summary>
/// <param name="ownerSymbol">Symbol on which the attribute is applied</param>
/// <param name="attributeType">Attribute class for the attribute</param>
/// <param name="node">Syntax node for attribute specification</param>
/// <param name="attributeLocation">Attribute target specifier location</param>
/// <param name="diagnostics">Diagnostics</param>
/// <returns>Whether attribute specification is allowed for the given symbol</returns>
internal bool VerifyAttributeUsageTarget(Symbol ownerSymbol, NamedTypeSymbol attributeType, AttributeSyntax node, AttributeLocation attributeLocation, DiagnosticBag diagnostics)
{
var attributeUsageInfo = attributeType.AttributeUsageInfo(Compilation);
if (attributeUsageInfo != null)
{
AttributeTargets attributeTarget;
if (attributeLocation == AttributeLocation.Return)
{
// attribute on return type
attributeTarget = AttributeTargets.ReturnValue;
}
else
{
attributeTarget = ownerSymbol.GetAttributeTarget();
}
if ((attributeTarget & attributeUsageInfo.ValidTargets) != 0)
{
return(true);
}
// generate error
Error(diagnostics, ErrorCode.ERR_AttributeOnBadSymbolType, node, GetAttributeNameFromSyntax(node), attributeUsageInfo.GetValidTargetsString());
}
return(false);
}