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interpret: fail more gracefully on uninit unsized locals

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This commit is contained in:
Ralf Jung 2023-04-27 12:22:21 +02:00
parent 8b8110e146
commit 25e9b79060
4 changed files with 20 additions and 1 deletions
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6
compiler/rustc_const_eval/src/interpret/operand.rs
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@ -245,6 +245,12 @@ impl<'tcx, Prov: Provenance> ImmTy<'tcx, Prov> {
impl<'tcx, Prov: Provenance> OpTy<'tcx, Prov> {
pub fn len(&self, cx: &impl HasDataLayout) -> InterpResult<'tcx, u64> {
if self.layout.is_unsized() {
if matches!(self.op, Operand::Immediate(Immediate::Uninit)) {
// Uninit unsized places shouldn't occur. In the interpreter we have them
// temporarily for unsized arguments before their value is put in; in ConstProp they
// remain uninit and this code can actually be reached.
throw_inval!(UninitUnsizedLocal);
}
// There are no unsized immediates.
self.assert_mem_place().len(cx)
} else {