bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

Auto merge of #118128 - RalfJung:bad-intrinsics, r=the8472

Browse source 
warn against using intrinsics that leave the scope of our memory model
This commit is contained in:
bors 2023-12-03 05:03:12 +00:00
commit 2f1ba4a0af
1 changed files with 10 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

10
library/core/src/intrinsics.rs
View file

@ -341,6 +341,9 @@ extern "rust-intrinsic" {
/// [`Ordering::Relaxed`] as the `order`. For example, [`AtomicBool::load`].
#[rustc_nounwind]
pub fn atomic_load_relaxed<T: Copy>(src: *const T) -> T;
/// Do NOT use this intrinsic; "unordered" operations do not exist in our memory model!
/// In terms of the Rust Abstract Machine, this operation is equivalent to `src.read()`,
/// i.e., it performs a non-atomic read.
#[rustc_nounwind]
pub fn atomic_load_unordered<T: Copy>(src: *const T) -> T;
@ -365,6 +368,9 @@ extern "rust-intrinsic" {
/// [`Ordering::Relaxed`] as the `order`. For example, [`AtomicBool::store`].
#[rustc_nounwind]
pub fn atomic_store_relaxed<T: Copy>(dst: *mut T, val: T);
/// Do NOT use this intrinsic; "unordered" operations do not exist in our memory model!
/// In terms of the Rust Abstract Machine, this operation is equivalent to `dst.write(val)`,
/// i.e., it performs a non-atomic write.
#[rustc_nounwind]
pub fn atomic_store_unordered<T: Copy>(dst: *mut T, val: T);
@ -2312,6 +2318,10 @@ extern "rust-intrinsic" {
/// Emits a `!nontemporal` store according to LLVM (see their docs).
/// Probably will never become stable.
///
/// Do NOT use this intrinsic; "nontemporal" operations do not exist in our memory model!
/// It exists to support current stdarch, but the plan is to change stdarch and remove this intrinsic.
/// See <https://github.com/rust-lang/rust/issues/114582> for some more discussion.
#[rustc_nounwind]
pub fn nontemporal_store<T>(ptr: *mut T, val: T);