30 lines
803 B
Rust
30 lines
803 B
Rust
//@compile-flags: -Zmiri-permissive-provenance
|
|
|
|
/// This manually makes sure that we have a pointer with the proper alignment.
|
|
fn manual_alignment() {
|
|
let x = &mut [0u8; 3];
|
|
let base_addr = x as *mut _ as usize;
|
|
let base_addr_aligned = if base_addr % 2 == 0 { base_addr } else { base_addr + 1 };
|
|
let u16_ptr = base_addr_aligned as *mut u16;
|
|
unsafe {
|
|
*u16_ptr = 2;
|
|
}
|
|
}
|
|
|
|
/// Test standard library `align_to`.
|
|
fn align_to() {
|
|
const LEN: usize = 128;
|
|
let buf = &[0u8; LEN];
|
|
let (l, m, r) = unsafe { buf.align_to::<i32>() };
|
|
assert!(m.len() * 4 >= LEN - 4);
|
|
assert!(l.len() + r.len() <= 4);
|
|
}
|
|
|
|
fn main() {
|
|
// Do this a couple times in a loop because it may work "by chance".
|
|
for _ in 0..10 {
|
|
manual_alignment();
|
|
align_to();
|
|
}
|
|
}
|