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require full validity when determining the discriminant of a value #90895

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merged 1 commit into from
Nov 18, 2021
Merged

require full validity when determining the discriminant of a value #90895

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6 changes: 6 additions & 0 deletions compiler/rustc_const_eval/src/interpret/intrinsics.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -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)?;
}
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6 changes: 6 additions & 0 deletions compiler/rustc_const_eval/src/interpret/step.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -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)?;
}
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