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Add CastKind::Transmute to MIR

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Updates `interpret`, `codegen_ssa`, and `codegen_cranelift` to consume the new cast instead of the intrinsic.

Includes `CastTransmute` for custom MIR building, to be able to test the extra UB.
This commit is contained in:
Scott McMurray 2023-02-24 18:32:52 -08:00
parent a266f11990
commit 64cce5fc7d
55 changed files with 955 additions and 190 deletions
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9
compiler/rustc_mir_transform/src/const_prop.rs
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@ -504,6 +504,15 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
return None;
}
// Do not try creating references, nor any types with potentially-complex
// invariants. This avoids an issue where checking validity would do a
// bunch of work generating a nice message about the invariant violation,
// only to not show it to anyone (since this isn't the lint).
Rvalue::Cast(CastKind::Transmute, op, dst_ty) if !dst_ty.is_primitive() => {
trace!("skipping Transmute of {:?} to {:?}", op, dst_ty);
return None;
}
// There's no other checking to do at this time.
Rvalue::Aggregate(..)