private CustomAttributeBuilder CreateCustomAttributeBuilder(Cci.ICustomAttribute attribute)
{
// TODO (tomat): Use CCI to build the blob?
// TODO (tomat): The CustomAttributeBuilder has problems with application of an attribute on itself
// and other dependencies on unbaked types.
// e.g. [My]class MyAttribute : Attribute { }
var ctor = ResolveConstructor(attribute.Constructor(_context));
var attributeType = ctor.DeclaringType;
object[] argValues = new object[attribute.ArgumentCount];
ArrayBuilder<object> propertyValues = null;
ArrayBuilder<object> fieldValues = null;
ArrayBuilder<FieldInfo> fields = null;
ArrayBuilder<PropertyInfo> properties = null;
try
{
int i = 0;
foreach (Cci.IMetadataExpression arg in attribute.GetArguments(_context))
{
argValues[i++] = GetMetadataExpressionValue(arg);
}
foreach (Cci.IMetadataNamedArgument namedArg in attribute.GetNamedArguments(_context))
{
object value = GetMetadataExpressionValue(namedArg.ArgumentValue);
string name = namedArg.ArgumentName;
Type type = ResolveType(namedArg.Type);
if (namedArg.IsField)
{
if (fields == null)
{
fields = ArrayBuilder<FieldInfo>.GetInstance();
fieldValues = ArrayBuilder<object>.GetInstance();
}
var field = new FieldRef(attributeType, name, type);
fields.Add(field);
fieldValues.Add(value);
}
else
{
if (properties == null)
{
properties = ArrayBuilder<PropertyInfo>.GetInstance();
propertyValues = ArrayBuilder<object>.GetInstance();
}
var property = new CustomAttributeProperty(attributeType, name, type);
properties.Add(property);
propertyValues.Add(value);
}
}
try
{
return new CustomAttributeBuilder(
ctor as ConstructorInfo ?? new ConstructorRef(ctor),
argValues,
(properties != null) ? properties.ToArray() : SpecializedCollections.EmptyArray<PropertyInfo>(),
(properties != null) ? propertyValues.ToArray() : SpecializedCollections.EmptyArray<object>(),
(fields != null) ? fields.ToArray() : SpecializedCollections.EmptyArray<FieldInfo>(),
(fields != null) ? fieldValues.ToArray() : SpecializedCollections.EmptyArray<object>());
}
catch (ArgumentException)
{
throw new NotSupportedException("Ref.Emit limitation");
}
}
finally
{
if (properties != null)
{
properties.Free();
propertyValues.Free();
}
if (fields != null)
{
fields.Free();
fieldValues.Free();
}
}
}