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#[macro_use]
extern crate lazy_static;
#[macro_use]
macro_rules! modfunc {
($STORE:ident,$FP:ident,$NAME:ident ($($name:ident:$args:ty),* ) => $ret:ty$body:block) => {
lazy_static! {
static ref $FP: ::std::sync::atomic::AtomicPtr<extern "Rust" fn($($args),*)->$ret> =
::std::sync::atomic::AtomicPtr::new(unsafe{::std::mem::transmute(0usize)});
}
pub fn $STORE(ptr: extern "Rust" fn($($args),*)->$ret) {
use std::sync::atomic::Ordering;
use std::mem::transmute;
$FP.store(unsafe{transmute(ptr)},Ordering::SeqCst);
}
pub fn $NAME($($name:$args),*) -> $ret {
{
use std::sync::atomic::Ordering;
use std::mem::transmute;
let ptr = $FP.load(Ordering::Acquire);
let ptr: usize = unsafe{transmute(ptr)};
if ptr != 0 {
let func: extern "Rust" fn($($args),*)->$ret =
unsafe{transmute(ptr)};
return func($($name),*);
}
}
$body
}
};
($STORE:ident,$FP:ident,$NAME:ident($($name:ident:$arg:ty),*) => ($($ret:ty),*) $body:block) => {
lazy_static! {
static ref $FP: ::std::sync::atomic::AtomicPtr<extern "Rust" fn($($args),*)->($($ret),*)> =
::std::sync::atomic::AtomicPtr::new(unsafe{::std::mem::transmute(0usize)});
}
pub fn $STORE(ptr: extern "Rust" fn($($args),*)->($($ret),*)) {
use std::sync::atomic::Ordering;
use std::mem::transmute;
$FP.store(unsafe{transmute(ptr)},Ordering::SeqCst);
}
pub fn $NAME($($name:$args),*) -> ($($ret),*) {
{
use std::sync::atomic::Ordering;
use std::mem::transmute;
let ptr = $FP.load(Ordering::Acquire);
let ptr: usize = unsafe{transmute(ptr)};
if ptr != 0 {
let func: extern "Rust" fn($($args),*)->$ret =
unsafe{transmute(ptr)};
return func($($name),*);
}
}
$body
}
};
(ABI:$ABI:expr,$STORE:ident,$FP:ident,$NAME:ident ($($name:ident:$args:ty),* ) => $ret:ty$body:block) => {
lazy_static! {
static ref $FP: ::std::sync::atomic::AtomicPtr<extern $ABI fn($($args),*)->$ret> =
::std::sync::atomic::AtomicPtr::new(unsafe{::std::mem::transmute(0usize)});
}
pub fn $STORE(ptr: extern $ABI fn($($args),*)->$ret) {
use std::sync::atomic::Ordering;
use std::mem::transmute;
$FP.store(unsafe{transmute(ptr)},Ordering::SeqCst);
}
pub fn $NAME($($name:$args),*) -> $ret {
{
use std::sync::atomic::Ordering;
use std::mem::transmute;
let ptr = $FP.load(Ordering::Acquire);
let ptr: usize = unsafe{transmute(ptr)};
if ptr != 0 {
let func: extern $ABI fn($($args),*)->$ret =
unsafe{transmute(ptr)};
return func($($name),*);
}
}
$body
}
};
(ABI:$ABI:expr,$STORE:ident,$FP:ident,$NAME:ident($($name:ident:$arg:ty),*) => ($($ret:ty),*) $body:block) => {
lazy_static! {
static ref $FP: ::std::sync::atomic::AtomicPtr<extern $ABI fn($($args),*)->($($ret),*)> =
::std::sync::atomic::AtomicPtr::new(unsafe{::std::mem::transmute(0usize)});
}
pub fn $STORE(ptr: extern $ABI fn($($args),*)->($($ret),*)) {
use std::sync::atomic::Ordering;
use std::mem::transmute;
$FP.store(unsafe{transmute(ptr)},Ordering::SeqCst);
}
pub fn $NAME($($name:$args),*) -> ($($ret),*) {
{
use std::sync::atomic::Ordering;
use std::mem::transmute;
let ptr = $FP.load(Ordering::Acquire);
let ptr: usize = unsafe{transmute(ptr)};
if ptr != 0 {
let func: extern $ABI fn($($args),*)->$ret =
unsafe{transmute(ptr)};
return func($($name),*);
}
}
$body
}
};
}
#[test]
fn test_the_other_thing() {
modfunc!(replace_add,IDC, add(x: u64, y: u64) => u64 {
x + y
});
assert_eq!(add(5,2),7);
fn totally_not_add(x: u64, y: u64) -> u64 {
return x*x+y;
}
replace_add(totally_not_add);
assert_eq!(add(5,2),27);
}