24 lines
898 B
Rust
24 lines
898 B
Rust
// `PrimVal`s in Miri are represented with 8 bytes (u64) and at the time of writing, the `-x`
|
|
// will sign extend into the entire 8 bytes. Then, if you tried to write the `-x` into
|
|
// something smaller than 8 bytes, like a 4 byte pointer, it would crash in byteorder crate
|
|
// code that assumed only the low 4 bytes would be set. Actually, we were masking properly for
|
|
// everything except pointers before I fixed it, so this was probably impossible to reproduce on
|
|
// 64-bit.
|
|
//
|
|
// This is just intended as a regression test to make sure we don't reintroduce this problem.
|
|
|
|
#[cfg(target_pointer_width = "32")]
|
|
fn main() {
|
|
use std::mem::transmute;
|
|
|
|
// Make the weird PrimVal.
|
|
let x = 1i32;
|
|
let bad = unsafe { transmute::<i32, *const u8>(-x) };
|
|
|
|
// Force it through the Memory::write_primval code.
|
|
drop(Box::new(bad));
|
|
}
|
|
|
|
#[cfg(not(target_pointer_width = "32"))]
|
|
fn main() {}
|