/// <summary>
/// Returns a possibly ExtensionAttribute filtered roArray of attributes. If
/// filterExtensionAttributes is set to true, the method will remove all ExtensionAttributes
/// from the returned array. If it is false, the parameter foundExtension will always be set to
/// false and can be safely ignored.
///
/// The paramArrayAttribute parameter is similar to the foundExtension parameter, but instead
/// of just indicating if the attribute was found, the parameter is set to the attribute handle
/// for the ParamArrayAttribute if any is found and is null otherwise. This allows NoPia to filter
/// the attribute out for the symbol but still cache it separately for emit.
/// </summary>
internal ImmutableArray <CSharpAttributeData> GetCustomAttributesForToken(EntityHandle token,
out CustomAttributeHandle filteredOutAttribute1,
AttributeDescription filterOut1,
out CustomAttributeHandle filteredOutAttribute2,
AttributeDescription filterOut2)
{
filteredOutAttribute1 = default(CustomAttributeHandle);
filteredOutAttribute2 = default(CustomAttributeHandle);
ArrayBuilder <CSharpAttributeData> customAttributesBuilder = null;
try
{
foreach (var customAttributeHandle in _module.GetCustomAttributesOrThrow(token))
{
if (filterOut1.Signatures != null &&
Module.GetTargetAttributeSignatureIndex(customAttributeHandle, filterOut1) != -1)
{
// It is important to capture the last application of the attribute that we run into,
// it makes a difference for default and constant values.
filteredOutAttribute1 = customAttributeHandle;
continue;
}
if (filterOut2.Signatures != null &&
Module.GetTargetAttributeSignatureIndex(customAttributeHandle, filterOut2) != -1)
{
// It is important to capture the last application of the attribute that we run into,
// it makes a difference for default and constant values.
filteredOutAttribute2 = customAttributeHandle;
continue;
}
if (customAttributesBuilder == null)
{
customAttributesBuilder = ArrayBuilder <CSharpAttributeData> .GetInstance();
}
customAttributesBuilder.Add(new PEAttributeData(this, customAttributeHandle));
}
}
catch (BadImageFormatException)
{ }
if (customAttributesBuilder != null)
{
return(customAttributesBuilder.ToImmutableAndFree());
}
return(ImmutableArray <CSharpAttributeData> .Empty);
}