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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 edb0717e7c
commit 9558e12965
2 changed files with 4 additions and 10 deletions
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4
src/base.rs
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@ -709,6 +709,10 @@ fn is_fat_ptr<'tcx>(fx: &FunctionCx<'_, '_, 'tcx>, ty: Ty<'tcx>) -> bool {
let operand = codegen_operand(fx, operand);
operand.coerce_dyn_star(fx, lval);
}
Rvalue::Cast(CastKind::Transmute, ref operand, _to_ty) => {
let operand = codegen_operand(fx, operand);
lval.write_cvalue_transmute(fx, operand);
}
Rvalue::Discriminant(place) => {
let place = codegen_place(fx, place);
let value = place.to_cvalue(fx);

10
src/intrinsics/mod.rs
View File

@ -557,16 +557,6 @@ fn codegen_regular_intrinsic_call<'tcx>(
fx.bcx.ins().band(ptr, mask);
}
sym::transmute => {
intrinsic_args!(fx, args => (from); intrinsic);
if ret.layout().abi.is_uninhabited() {
crate::base::codegen_panic(fx, "Transmuting to uninhabited type.", source_info);
return;
}
ret.write_cvalue_transmute(fx, from);
}
sym::write_bytes | sym::volatile_set_memory => {
intrinsic_args!(fx, args => (dst, val, count); intrinsic);
let val = val.load_scalar(fx);