bjoernager/rust
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Support safe intrinsics with fallback bodies

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Turn `is_val_statically_known` into such an intrinsic to demonstrate. It is perfectly safe to call after all.
This commit is contained in:
Oli Scherer 2024-02-02 14:47:59 +00:00
parent 6b73fe2d09
commit f35a2bd401
5 changed files with 16 additions and 15 deletions
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11
compiler/rustc_hir_analysis/src/check/intrinsic.rs
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@ -71,9 +71,13 @@ fn equate_intrinsic_type<'tcx>(
/// Returns the unsafety of the given intrinsic.
pub fn intrinsic_operation_unsafety(tcx: TyCtxt<'_>, intrinsic_id: LocalDefId) -> hir::Unsafety {
let has_safe_attr = match tcx.has_attr(intrinsic_id, sym::rustc_safe_intrinsic) {
true => hir::Unsafety::Normal,
false => hir::Unsafety::Unsafe,
let has_safe_attr = if tcx.has_attr(intrinsic_id, sym::rustc_intrinsic) {
tcx.fn_sig(intrinsic_id).skip_binder().unsafety()
} else {
match tcx.has_attr(intrinsic_id, sym::rustc_safe_intrinsic) {
true => hir::Unsafety::Normal,
false => hir::Unsafety::Unsafe,
}
};
let is_in_list = match tcx.item_name(intrinsic_id.into()) {
// When adding a new intrinsic to this list,
@ -117,6 +121,7 @@ pub fn intrinsic_operation_unsafety(tcx: TyCtxt<'_>, intrinsic_id: LocalDefId) -
| sym::forget
| sym::black_box
| sym::variant_count
| sym::is_val_statically_known
| sym::ptr_mask
| sym::debug_assertions => hir::Unsafety::Normal,
_ => hir::Unsafety::Unsafe,