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Adjust ConstraintGraphDirection methods.

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This facilitates the next commit.
This commit is contained in:
Nicholas Nethercote
2025-02-27 08:55:03 +11:00
parent 00f245915b
commit 60bf07a26c
1 changed files with 12 additions and 12 deletions
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compiler/rustc_borrowck/src/constraints/graph.rs
+12 -12
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@@ -23,8 +23,8 @@ pub(crate) struct ConstraintGraph<D: ConstraintGraphDirection> {
/// Marker trait that controls whether a `R1: R2` constraint
/// represents an edge `R1 -> R2` or `R2 -> R1`.
pub(crate) trait ConstraintGraphDirection: Copy + 'static {
fn start_region(c: &OutlivesConstraint<'_>) -> RegionVid;
fn end_region(c: &OutlivesConstraint<'_>) -> RegionVid;
fn start_region(sup: RegionVid, sub: RegionVid) -> RegionVid;
fn end_region(sup: RegionVid, sub: RegionVid) -> RegionVid;
fn is_normal() -> bool;
}
@@ -36,12 +36,12 @@ pub(crate) trait ConstraintGraphDirection: Copy + 'static {
pub(crate) struct Normal;
impl ConstraintGraphDirection for Normal {
fn start_region(c: &OutlivesConstraint<'_>) -> RegionVid {
c.sup
fn start_region(sup: RegionVid, _sub: RegionVid) -> RegionVid {
sup
}
fn end_region(c: &OutlivesConstraint<'_>) -> RegionVid {
c.sub
fn end_region(_sup: RegionVid, sub: RegionVid) -> RegionVid {
sub
}
fn is_normal() -> bool {
@@ -57,12 +57,12 @@ fn is_normal() -> bool {
pub(crate) struct Reverse;
impl ConstraintGraphDirection for Reverse {
fn start_region(c: &OutlivesConstraint<'_>) -> RegionVid {
c.sub
fn start_region(_sup: RegionVid, sub: RegionVid) -> RegionVid {
sub
}
fn end_region(c: &OutlivesConstraint<'_>) -> RegionVid {
c.sup
fn end_region(sup: RegionVid, _sub: RegionVid) -> RegionVid {
sup
}
fn is_normal() -> bool {
@@ -84,7 +84,7 @@ pub(crate) fn new(
let mut next_constraints = IndexVec::from_elem(None, &set.outlives);
for (idx, constraint) in set.outlives.iter_enumerated().rev() {
let head = &mut first_constraints[D::start_region(constraint)];
let head = &mut first_constraints[D::start_region(constraint.sup, constraint.sub)];
let next = &mut next_constraints[idx];
debug_assert!(next.is_none());
*next = *head;
@@ -207,7 +207,7 @@ impl<'a, 'tcx, D: ConstraintGraphDirection> Iterator for Successors<'a, 'tcx, D>
type Item = RegionVid;
fn next(&mut self) -> Option<Self::Item> {
self.edges.next().map(|c| D::end_region(&c))
self.edges.next().map(|c| D::end_region(c.sup, c.sub))
}
}