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use std::any::{Any, TypeId};
use std::mem;
use runtime::Imp;
extern {
fn objc_msgSend();
fn objc_msgSend_stret();
fn objc_msgSendSuper();
fn objc_msgSendSuper_stret();
}
pub fn msg_send_fn<R: Any>() -> Imp {
// Double-word sized fundamental data types don't use stret,
// but any composite type larger than 4 bytes does.
let type_id = TypeId::of::<R>();
if mem::size_of::<R>() <= 4 ||
type_id == TypeId::of::<i64>() ||
type_id == TypeId::of::<u64>() ||
type_id == TypeId::of::<f64>() {
objc_msgSend
} else {
objc_msgSend_stret
}
}
pub fn msg_send_super_fn<R: Any>() -> Imp {
let type_id = TypeId::of::<R>();
if mem::size_of::<R>() <= 4 ||
type_id == TypeId::of::<i64>() ||
type_id == TypeId::of::<u64>() ||
type_id == TypeId::of::<f64>() {
objc_msgSendSuper
} else {
objc_msgSendSuper_stret
}
}