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Flood with bottom for Deinit, StorageLive and StorageDead

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This commit is contained in:
Jannis Christopher Köhl 2022-10-05 20:46:39 +02:00
parent eab77320e6
commit 2f66e9417f
1 changed files with 5 additions and 4 deletions
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9
compiler/rustc_mir_dataflow/src/value_analysis.rs
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@ -91,12 +91,13 @@ pub trait ValueAnalysis<'tcx> {
self.handle_intrinsic(intrinsic, state);
}
StatementKind::StorageLive(local) | StatementKind::StorageDead(local) => {
// It is UB to read from an unitialized or unallocated local.
state.flood(Place::from(*local).as_ref(), self.map());
// We can flood with bottom here, because `StorageLive` makes the local
// uninitialized, and `StorageDead` makes it UB to access.
state.flood_with(Place::from(*local).as_ref(), self.map(), Self::Value::bottom());
}
StatementKind::Deinit(box place) => {
// It is UB to read `uninit` bytes.
state.flood(place.as_ref(), self.map());
// The bottom states denotes uninitialized values.
state.flood_with(place.as_ref(), self.map(), Self::Value::bottom());
}
StatementKind::Nop
| StatementKind::Retag(..)