bjoernager/rust
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interpret: remove LocalValue::Unallocated, add Operand::Uninit

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Operand::Uninit is an *allocated* operand that is fully uninitialized.
This lets us lazily allocate the actual backing store of *all* locals (no matter their ABI).

I also reordered things in pop_stack_frame at the same time.
I should probably have made that a separate commit...
This commit is contained in:
Ralf Jung 2022-07-02 16:24:42 -04:00
parent 049308cf8b
commit 8ef0caa23c
8 changed files with 179 additions and 175 deletions
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3
compiler/rustc_const_eval/src/interpret/cast.rs
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@ -153,7 +153,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
assert_eq!(dest_layout.size, self.pointer_size());
assert!(src.layout.ty.is_unsafe_ptr());
return match **src {
Immediate::ScalarPair(data, _) => Ok(data.into()),
Immediate::ScalarPair(data, _) => Ok(data.check_init()?.into()),
Immediate::Scalar(..) => span_bug!(
self.cur_span(),
"{:?} input to a fat-to-thin cast ({:?} -> {:?})",
@ -161,6 +161,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
src.layout.ty,
cast_ty
),
Immediate::Uninit => throw_ub!(InvalidUninitBytes(None)),
};
}
}