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RegionInferenceContext: remove Rc from rev_scc_graph field

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This commit is contained in:
klensy 2023-04-24 13:25:23 +03:00
parent d3edfd18c7
commit a621ec35ae
2 changed files with 8 additions and 11 deletions
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6
compiler/rustc_borrowck/src/region_infer/mod.rs
View File

@ -76,7 +76,7 @@ pub struct RegionInferenceContext<'tcx> {
/// Reverse of the SCC constraint graph -- i.e., an edge `A -> B` exists if
/// `B: A`. This is used to compute the universal regions that are required
/// to outlive a given SCC. Computed lazily.
rev_scc_graph: Option<Rc<ReverseSccGraph>>,
rev_scc_graph: Option<ReverseSccGraph>,
/// The "R0 member of [R1..Rn]" constraints, indexed by SCC.
member_constraints: Rc<MemberConstraintSet<'tcx, ConstraintSccIndex>>,
@ -813,9 +813,9 @@ impl<'tcx> RegionInferenceContext<'tcx> {
// free region that must outlive the member region `R0` (`UB:
// R0`). Therefore, we need only keep an option `O` if `UB: O`
// for all UB.
let rev_scc_graph = self.reverse_scc_graph();
self.compute_reverse_scc_graph();
let universal_region_relations = &self.universal_region_relations;
for ub in rev_scc_graph.upper_bounds(scc) {
for ub in self.rev_scc_graph.as_ref().unwrap().upper_bounds(scc) {
debug!(?ub);
choice_regions.retain(|&o_r| universal_region_relations.outlives(ub, o_r));
}

13
compiler/rustc_borrowck/src/region_infer/reverse_sccs.rs
View File

@ -8,7 +8,6 @@ use rustc_data_structures::graph::vec_graph::VecGraph;
use rustc_data_structures::graph::WithSuccessors;
use rustc_middle::ty::RegionVid;
use std::ops::Range;
use std::rc::Rc;
pub(crate) struct ReverseSccGraph {
graph: VecGraph<ConstraintSccIndex>,
@ -40,10 +39,10 @@ impl ReverseSccGraph {
}
impl RegionInferenceContext<'_> {
/// Compute and return the reverse SCC-based constraint graph (lazily).
pub(super) fn reverse_scc_graph(&mut self) -> Rc<ReverseSccGraph> {
if let Some(g) = &self.rev_scc_graph {
return g.clone();
/// Compute the reverse SCC-based constraint graph (lazily).
pub(super) fn compute_reverse_scc_graph(&mut self) {
if matches!(self.rev_scc_graph, Some(_)) {
return;
}
let graph = self.constraint_sccs.reverse();
@ -63,8 +62,6 @@ impl RegionInferenceContext<'_> {
start += group_size;
}
let rev_graph = Rc::new(ReverseSccGraph { graph, scc_regions, universal_regions });
self.rev_scc_graph = Some(rev_graph.clone());
rev_graph
self.rev_scc_graph = Some(ReverseSccGraph { graph, scc_regions, universal_regions });
}
}