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require full validity when determining the discriminant of a value

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This commit is contained in:
Ralf Jung 2021-11-14 13:08:51 -05:00
parent 1b12d01903
commit 498ebc46ba
2 changed files with 12 additions and 0 deletions
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6
compiler/rustc_const_eval/src/interpret/intrinsics.rs
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@ -265,6 +265,12 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
}
sym::discriminant_value => {
let place = self.deref_operand(&args[0])?;
if M::enforce_validity(self) {
// This is 'using' the value, so make sure the validity invariant is satisfied.
// (Also see https://github.com/rust-lang/rust/pull/89764.)
self.validate_operand(&place.into())?;
}
let discr_val = self.read_discriminant(&place.into())?.0;
self.write_scalar(discr_val, dest)?;
}

6
compiler/rustc_const_eval/src/interpret/step.rs
View File

@ -304,6 +304,12 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
Discriminant(place) => {
let op = self.eval_place_to_op(place, None)?;
if M::enforce_validity(self) {
// This is 'using' the value, so make sure the validity invariant is satisfied.
// (Also see https://github.com/rust-lang/rust/pull/89764.)
self.validate_operand(&op)?;
}
let discr_val = self.read_discriminant(&op)?.0;
self.write_scalar(discr_val, &dest)?;
}