bjoernager/rust
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Add tracking of unreachability

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This commit is contained in:
Jannis Christopher Köhl 2022-09-02 14:41:27 +02:00
parent 16dedba1c8
commit fe84bbf844
4 changed files with 82 additions and 30 deletions
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5
compiler/rustc_mir_transform/src/dataflow_const_prop.rs
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@ -148,7 +148,6 @@ impl<'tcx> ValueAnalysis<'tcx> for ConstAnalysis<'tcx> {
) {
// FIXME: The dataflow framework only provides the state if we call `apply()`, which makes
// this more inefficient than it has to be.
// FIXME: Perhaps we rather need a proper unreachability flag for every block.
let mut discr_value = None;
let mut handled = false;
apply_edge_effects.apply(|state, target| {
@ -181,8 +180,8 @@ impl<'tcx> ValueAnalysis<'tcx> for ConstAnalysis<'tcx> {
// Branch is taken. Has no effect on state.
handled = true;
} else {
// Branch is not taken, we can flood everything with bottom.
state.flood_all_with(FlatSet::Bottom);
// Branch is not taken.
state.mark_unreachable();
}
})
}