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Do not clone MIR for const-prop lint. #115908

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Merged
merged 1 commit into from
Sep 18, 2023
Merged

Do not clone MIR for const-prop lint. #115908

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25 changes: 4 additions & 21 deletions compiler/rustc_mir_transform/src/const_prop_lint.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -105,25 +105,12 @@ impl<'tcx> MirLint<'tcx> for ConstProp {

trace!("ConstProp starting for {:?}", def_id);

let dummy_body = &Body::new(
body.source,
(*body.basic_blocks).to_owned(),
body.source_scopes.clone(),
body.local_decls.clone(),
Default::default(),
body.arg_count,
Default::default(),
body.span,
body.generator_kind(),
body.tainted_by_errors,
);

// FIXME(oli-obk, eddyb) Optimize locals (or even local paths) to hold
// constants, instead of just checking for const-folding succeeding.
// That would require a uniform one-def no-mutation analysis
// and RPO (or recursing when needing the value of a local).
let mut optimization_finder = ConstPropagator::new(body, dummy_body, tcx);
optimization_finder.visit_body(body);
let mut linter = ConstPropagator::new(body, tcx);
linter.visit_body(body);

trace!("ConstProp done for {:?}", def_id);
}
Expand Down Expand Up @@ -169,11 +156,7 @@ impl<'tcx> ty::layout::HasParamEnv<'tcx> for ConstPropagator<'_, 'tcx> {
}

impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
fn new(
body: &Body<'tcx>,
dummy_body: &'mir Body<'tcx>,
tcx: TyCtxt<'tcx>,
) -> ConstPropagator<'mir, 'tcx> {
fn new(body: &'mir Body<'tcx>, tcx: TyCtxt<'tcx>) -> ConstPropagator<'mir, 'tcx> {
let def_id = body.source.def_id();
let args = &GenericArgs::identity_for_item(tcx, def_id);
let param_env = tcx.param_env_reveal_all_normalized(def_id);
Expand Down Expand Up @@ -204,7 +187,7 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {

ecx.push_stack_frame(
Instance::new(def_id, args),
dummy_body,
body,
&ret,
StackPopCleanup::Root { cleanup: false },
)
Expand Down