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This is now a safe interface!

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nora 2022-10-09 17:31:20 +02:00 • committed by nils
parent 7d95a7dfaf
commit 22aaf91cc1
3 changed files with 10 additions and 14 deletions
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4
src/backend.rs
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@ -54,6 +54,7 @@ mod backend_size_asserts {
const _: () = assert_same_size::<usize, <usize as Backend>::Stored>();
}
// SAFETY: We are careful around provenance
unsafe impl Backend for usize {
type Stored = *mut ();
@ -72,6 +73,7 @@ unsafe impl Backend for usize {
#[cfg(target_pointer_width = "64")]
/// on 64 bit, we can just treat u64/usize interchangeably, because uintptr_t == size_t in Rust
// SAFETY: We are careful around provenance
unsafe impl Backend for u64 {
type Stored = *mut ();
@ -90,6 +92,7 @@ unsafe impl Backend for u64 {
macro_rules! impl_backend_2_tuple {
(impl for $ty:ty { (*mut (), $int:ident), $num:expr }) => {
// SAFETY: We are careful around provenance
unsafe impl Backend for $ty {
// this one keeps the MSB in the pointer address, and the LSB in the integer
@ -117,6 +120,7 @@ macro_rules! impl_backend_2_tuple {
#[cfg_attr(target_pointer_width = "64", allow(unused))] // not required on 64 bit
macro_rules! impl_backend_3_tuple {
(impl for $ty:ty { (*mut (), $int1:ident, $int2:ident), $num1:expr, $num2:expr }) => {
// SAFETY: We are careful around provenance
unsafe impl Backend for $ty {
// this one keeps the MSB in the pointer address, ISB in int1 and the LSB in the int2