private List <CustomAttribute> HandleCustomAttributes(Cts.Ecma.EcmaModule module, Ecma.CustomAttributeHandleCollection attributes)
{
List <CustomAttribute> customAttributes = new List <CustomAttribute>(attributes.Count);
var attributeTypeProvider = new Cts.Ecma.CustomAttributeTypeProvider(module);
foreach (var attributeHandle in attributes)
{
Ecma.MetadataReader reader = module.MetadataReader;
Ecma.CustomAttribute attribute = reader.GetCustomAttribute(attributeHandle);
// TODO-NICE: We can intern the attributes based on the CA constructor and blob bytes
try
{
Cts.MethodDesc constructor = module.GetMethod(attribute.Constructor);
var decodedValue = attribute.DecodeValue(attributeTypeProvider);
if (IsBlockedCustomAttribute(constructor, decodedValue))
{
continue;
}
customAttributes.Add(HandleCustomAttribute(constructor, decodedValue));
}
catch (Cts.TypeSystemException)
{
// TODO: We should emit unresolvable custom attributes instead of skipping these
}
}
return(customAttributes);
}
static decimal?TryDecodeDecimalConstantAttribute(MetadataModule module, System.Reflection.Metadata.CustomAttribute attribute)
{
var attrValue = attribute.DecodeValue(module.TypeProvider);
if (attrValue.FixedArguments.Length != 5)
{
return(null);
}
// DecimalConstantAttribute has the arguments (byte scale, byte sign, uint hi, uint mid, uint low) or (byte scale, byte sign, int hi, int mid, int low)
// Both of these invoke the Decimal constructor (int lo, int mid, int hi, bool isNegative, byte scale) with explicit argument conversions if required.
if (!(attrValue.FixedArguments[0].Value is byte scale && attrValue.FixedArguments[1].Value is byte sign))
{
return(null);
}
unchecked {
if (attrValue.FixedArguments[2].Value is uint hi &&
attrValue.FixedArguments[3].Value is uint mid &&
attrValue.FixedArguments[4].Value is uint lo)
{
return(new decimal((int)lo, (int)mid, (int)hi, sign != 0, scale));
}
}
{
if (attrValue.FixedArguments[2].Value is int hi &&
attrValue.FixedArguments[3].Value is int mid &&
attrValue.FixedArguments[4].Value is int lo)
{
return(new decimal(lo, mid, hi, sign != 0, scale));
}
}
return(null);
}
private List <CustomAttribute> HandleCustomAttributes(Cts.Ecma.EcmaModule module, Ecma.CustomAttributeHandleCollection attributes)
{
List <CustomAttribute> customAttributes = new List <CustomAttribute>(attributes.Count);
var attributeTypeProvider = new Cts.Ecma.CustomAttributeTypeProvider(module);
Ecma.MetadataReader reader = module.MetadataReader;
foreach (var attributeHandle in attributes)
{
if (!_policy.GeneratesMetadata(module, attributeHandle))
{
continue;
}
Ecma.CustomAttribute attribute = reader.GetCustomAttribute(attributeHandle);
// TODO-NICE: We can intern the attributes based on the CA constructor and blob bytes
Cts.MethodDesc constructor = module.GetMethod(attribute.Constructor);
var decodedValue = attribute.DecodeValue(attributeTypeProvider);
customAttributes.Add(HandleCustomAttribute(constructor, decodedValue));
}
return(customAttributes);
}