private static void LoadArg(ILGenerator il, int arg)
{
switch (arg)
{
case 0:
il.Emit(OpCodes.Ldarg_0);
break;
case 1:
il.Emit(OpCodes.Ldarg_1);
break;
case 2:
il.Emit(OpCodes.Ldarg_2);
break;
case 3:
il.Emit(OpCodes.Ldarg_3);
break;
default:
il.Emit(OpCodes.Ldarg, arg);
break;
}
}
private static void Convert(ILGenerator il, Type from, Type to, MethodInfo fallbackConverter) // TODO: add number conversion + array conversion
{
if (from == typeof(object))
{
if (to.IsValueType)
{
il.Emit(OpCodes.Unbox_Any, to);
}
else
{
il.Emit(OpCodes.Castclass, to);
}
return;
}
MethodInfo converter = getConversionOperator(from, to);
if (converter == null && fallbackConverter != null)
{
converter = fallbackConverter.MakeGenericMethod(new Type[] { from, to });
}
if (converter == null)
{
throw new InvalidCastException($"Cannot cast from {from.Name} to {to.Name}, converter not found");
}
if (converter.IsGenericMethod)
{
try {
converter.Invoke(null, new object[] { null });
} catch (InvalidCastException) {
throw new InvalidCastException($"Cannot cast from {from.Name} to {to.Name}");
}
}