44 lines
909 B
Rust
44 lines
909 B
Rust
|
#![feature(custom_mir, core_intrinsics)]
|
||
|
|
|
||
|
|
extern crate core;
|
||
|
|
use core::intrinsics::mir::*;
|
||
|
|
use core::ptr::{addr_of, addr_of_mut};
|
||
|
|
|
||
|
|
// EMIT_MIR references.mut_ref.built.after.mir
|
||
|
|
#[custom_mir(dialect = "runtime", phase = "optimized")]
|
||
|
|
pub fn mut_ref(x: &mut i32) -> &mut i32 {
|
||
|
|
mir!(
|
||
|
|
let t: *mut i32;
|
||
|
|
|
||
|
|
{
|
||
|
|
t = addr_of_mut!(*x);
|
||
|
|
RetagRaw(t);
|
||
|
|
RET = &mut *t;
|
||
|
|
Retag(RET);
|
||
|
|
Return()
|
||
|
|
}
|
||
|
|
)
|
||
|
|
}
|
||
|
|
|
||
|
|
// EMIT_MIR references.immut_ref.built.after.mir
|
||
|
|
#[custom_mir(dialect = "runtime", phase = "optimized")]
|
||
|
|
pub fn immut_ref(x: &i32) -> &i32 {
|
||
|
|
mir!(
|
||
|
|
let t: *const i32;
|
||
|
|
|
||
|
|
{
|
||
|
|
t = addr_of!(*x);
|
||
|
|
RetagRaw(t);
|
||
|
|
RET = & *t;
|
||
|
|
Retag(RET);
|
||
|
|
Return()
|
||
|
|
}
|
||
|
|
)
|
||
|
|
}
|
||
|
|
|
||
|
|
fn main() {
|
||
|
|
let mut x = 5;
|
||
|
|
assert_eq!(*mut_ref(&mut x), 5);
|
||
|
|
assert_eq!(*immut_ref(&x), 5);
|
||
|
|
}
|