bjoernager/rust
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Do not see through copies of mutable pointers.

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This commit is contained in:
Camille GILLOT 2023-05-10 17:29:02 +00:00
parent d0d4e0237f
commit aeac555578
3 changed files with 13 additions and 12 deletions
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11
compiler/rustc_mir_transform/src/ref_prop.rs
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@ -208,13 +208,14 @@ fn compute_replacement<'tcx>(
// have been visited before.
Rvalue::Use(Operand::Copy(place) | Operand::Move(place))
| Rvalue::CopyForDeref(place) => {
if let Some(rhs) = place.as_local() {
if let Some(rhs) = place.as_local() && ssa.is_ssa(rhs) {
let target = targets[rhs];
if matches!(target, Value::Pointer(..)) {
// Only see through immutable reference and pointers, as we do not know yet if
// mutable references are fully replaced.
if !needs_unique && matches!(target, Value::Pointer(..)) {
targets[local] = target;
} else if ssa.is_ssa(rhs) {
let refmut = body.local_decls[rhs].ty.is_mutable_ptr();
targets[local] = Value::Pointer(tcx.mk_place_deref(rhs.into()), refmut);
} else {
targets[local] = Value::Pointer(tcx.mk_place_deref(rhs.into()), needs_unique);
}
}
}