private static void EmitDefaultValue(CodeGen cg, object value, Type type)
{
if (value is Missing) {
EmitMissingValue(cg, type);
} else {
cg.EmitRawConstant(value);
if (type.IsValueType) {
if (value == null) EmitException(cg, "Cannot cast None to {0}", type);
else if (value.GetType() != type) EmitException(cg, "Cannot cast {0} to {1}", value, type);
} else {
// null is any reference type
if (value != null) {
Type from = value.GetType();
if (!type.IsAssignableFrom(from)) {
EmitException(cg, "Cannot cast {0} to {1}", value, type);
} else {
if (from.IsValueType) {
cg.Emit(OpCodes.Box, from);
}
}
}
}
}
}
public override void Generate(CodeGen cg, Slot contextSlot, Slot[] argSlots)
{
cg.EmitRawConstant(null);
}