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interpret: clobber return place when calling function #105207

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Dec 6, 2022
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interpret: clobber return place when calling function #105207

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4 changes: 4 additions & 0 deletions compiler/rustc_const_eval/src/interpret/eval_context.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -676,6 +676,10 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
return_to_block: StackPopCleanup,
) -> InterpResult<'tcx> {
trace!("body: {:#?}", body);
// Clobber previous return place contents, nobody is supposed to be able to see them any more
// This also checks dereferenceable, but not align. We rely on all constructed places being
// sufficiently aligned (in particular we rely on `deref_operand` checking alignment).
self.write_uninit(return_place)?;
// first push a stack frame so we have access to the local substs
let pre_frame = Frame {
body,
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