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use std::any::{Any, TypeId};
use std::mem;
use runtime::Imp;
extern {
fn objc_msgSend();
fn objc_msgSend_fpret();
fn objc_msgSend_stret();
fn objc_msgSendSuper();
fn objc_msgSendSuper_stret();
}
pub fn msg_send_fn<R: Any>() -> Imp {
// Structures 1 or 2 bytes in size are placed in EAX.
// Structures 4 or 8 bytes in size are placed in: EAX and EDX.
// Structures of other sizes are placed at the address supplied by the caller.
// <https://developer.apple.com/library/mac/documentation/DeveloperTools/Conceptual/LowLevelABI/130-IA-32_Function_Calling_Conventions/IA32.html>
let type_id = TypeId::of::<R>();
let size = mem::size_of::<R>();
if type_id == TypeId::of::<f32>() ||
type_id == TypeId::of::<f64>() {
objc_msgSend_fpret
} else if size == 0 || size == 1 || size == 2 || size == 4 || size == 8 {
objc_msgSend
} else {
objc_msgSend_stret
}
}
pub fn msg_send_super_fn<R: Any>() -> Imp {
let size = mem::size_of::<R>();
if size == 0 || size == 1 || size == 2 || size == 4 || size == 8 {
objc_msgSendSuper
} else {
objc_msgSendSuper_stret
}
}
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