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adjust some const_eval_select safety comments

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This commit is contained in:
Ralf Jung 2021-11-28 14:00:58 -05:00
parent 15a4ed6937
commit 85558ad5b3
2 changed files with 6 additions and 6 deletions
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8
library/core/src/intrinsics.rs
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@ -2068,8 +2068,8 @@ pub const unsafe fn copy_nonoverlapping<T>(src: *const T, dst: *mut T, count: us
#[cfg(debug_assertions)]
const fn compiletime_check<T>(_src: *const T, _dst: *mut T, _count: usize) {}
#[cfg(debug_assertions)]
// SAFETY: runtime debug-assertions are a best-effort basis; it's fine to
// not do them during compile time
// SAFETY: As per our safety precondition, we may assume that the `abort` above is never reached.
// Therefore, compiletime_check and runtime_check are observably equivalent.
unsafe {
const_eval_select((src, dst, count), compiletime_check, runtime_check);
}
@ -2159,8 +2159,8 @@ pub const unsafe fn copy<T>(src: *const T, dst: *mut T, count: usize) {
#[cfg(debug_assertions)]
const fn compiletime_check<T>(_src: *const T, _dst: *mut T) {}
#[cfg(debug_assertions)]
// SAFETY: runtime debug-assertions are a best-effort basis; it's fine to
// not do them during compile time
// SAFETY: As per our safety precondition, we may assume that the `abort` above is never reached.
// Therefore, compiletime_check and runtime_check are observably equivalent.
unsafe {
const_eval_select((src, dst), compiletime_check, runtime_check);
}

4
library/core/src/slice/raw.rs
View file

@ -149,8 +149,8 @@ const fn debug_check_data_len<T>(data: *const T, len: usize) {
// it is not required for safety (the safety must be guatanteed by
// the `from_raw_parts[_mut]` caller).
//
// Since the checks are not required, we ignore them in CTFE as they can't
// be done there (alignment does not make much sense there).
// As per our safety precondition, we may assume that assertion above never fails.
// Therefore, noop and rt_check are observably equivalent.
unsafe {
crate::intrinsics::const_eval_select((data,), noop, rt_check);
}