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interpret/validity: improve some comments

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This commit is contained in:
Ralf Jung 2022-07-14 19:19:15 -04:00
parent f1a8854f9b
commit 6c6cccdd9b
1 changed files with 4 additions and 2 deletions
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6
compiler/rustc_const_eval/src/interpret/validity.rs
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@ -853,7 +853,8 @@ impl<'rt, 'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> ValueVisitor<'mir, 'tcx, M>
self.visit_scalar(scalar, scalar_layout)?;
}
Abi::ScalarPair(a_layout, b_layout) => {
// We would validate these things as we descend into the fields,
// There is no `rustc_layout_scalar_valid_range_start` for pairs, so
// we would validate these things as we descend into the fields,
// but that can miss bugs in layout computation. Layout computation
// is subtle due to enums having ScalarPair layout, where one field
// is the discriminant.
@ -867,7 +868,8 @@ impl<'rt, 'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> ValueVisitor<'mir, 'tcx, M>
}
Abi::Vector { .. } => {
// No checks here, we assume layout computation gets this right.
// (This is harder to check since Miri does not represent these as `Immediate`.)
// (This is harder to check since Miri does not represent these as `Immediate`. We
// also cannot use field projections since this might be a newtype around a vector.)
}
Abi::Aggregate { .. } => {
// Nothing to do.