public static void CheckReturnValue(MethodInfo method, JSExpression returnValue, TypeSystem typeSystem)
{
if (method == null)
{
return;
}
var resultType = returnValue.GetActualType(typeSystem);
var resultIsPackedArray = PackedArrayUtil.IsPackedArrayType(resultType);
var returnValueAttribute = method.Metadata.GetAttribute("JSIL.Meta.JSPackedArrayReturnValueAttribute");
if (returnValueAttribute != null)
{
if (!resultIsPackedArray)
{
throw new ArgumentException(
"Return value of method '" + method.Name + "' must be a packed array."
);
}
}
else
{
if (resultIsPackedArray)
{
throw new ArgumentException(
"Return value of method '" + method.Name + "' is a packed array. " +
"For this to be valid you must attach a JSPackedArrayReturnValueAttribute to the method."
);
}
}
}
public static JSExpression FilterInvocationResult(
MethodReference methodReference, MethodInfo method,
JSExpression result,
ITypeInfoSource typeInfo, TypeSystem typeSystem
)
{
if (method == null)
{
return(result);
}
var resultType = result.GetActualType(typeSystem);
var resultIsPackedArray = PackedArrayUtil.IsPackedArrayType(resultType);
var returnValueAttribute = method.Metadata.GetAttribute("JSIL.Meta.JSPackedArrayReturnValueAttribute");
if (returnValueAttribute != null)
{
if (TypeUtil.IsOpenType(resultType))
{
// FIXME: We need to restrict substitution to when the result type is a generic parameter owned by the invocation...
resultType = JSExpression.SubstituteTypeArgs(typeInfo, resultType, methodReference);
}
if (!resultIsPackedArray)
{
return(JSChangeTypeExpression.New(result, PackedArrayUtil.MakePackedArrayType(resultType, returnValueAttribute.Entries.First().Type), typeSystem));
}
}
return(result);
}