bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

Auto merge of #94527 - oli-obk:undef_scalars, r=nagisa,erikdesjardin

Browse source 
Let CTFE to handle partially uninitialized unions without marking the entire value as uninitialized.

follow up to #94411

To fix https://github.com/rust-lang/rust/issues/69488 and by extension fix https://github.com/rust-lang/rust/issues/94371, we should stop treating types like `MaybeUninit<usize>` as something that the `Scalar` type in the interpreter engine can represent. So we add a new field to `abi::Primitive` that records whether the primitive is nested in a union

cc `@RalfJung`

r? `@ghost`
This commit is contained in:
bors 2022-04-05 16:46:13 +00:00
commit f262ca12aa
42 changed files with 466 additions and 333 deletions
Download patch file Download diff file Expand all files Collapse all files

4
compiler/rustc_const_eval/src/interpret/validity.rs
View file

@ -629,12 +629,12 @@ impl<'rt, 'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> ValidityVisitor<'rt, 'mir, '
op: &OpTy<'tcx, M::PointerTag>,
scalar_layout: ScalarAbi,
) -> InterpResult<'tcx> {
if scalar_layout.valid_range.is_full_for(op.layout.size) {
if scalar_layout.valid_range(self.ecx).is_full_for(op.layout.size) {
// Nothing to check
return Ok(());
}
// At least one value is excluded.
let valid_range = scalar_layout.valid_range;
let valid_range = scalar_layout.valid_range(self.ecx);
let WrappingRange { start, end } = valid_range;
let max_value = op.layout.size.unsigned_int_max();
assert!(end <= max_value);