Struct rustc_borrowck::region_infer::values::LivenessValues

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pub(crate) struct LivenessValues {
    elements: Rc<DenseLocationMap>,
    live_regions: Option<FxHashSet<RegionVid>>,
    points: Option<SparseIntervalMatrix<RegionVid, PointIndex>>,
    pub(crate) loans: Option<LiveLoans>,
}
Expand description

Records the CFG locations where each region is live. When we initially compute liveness, we use an interval matrix storing liveness ranges for each region-vid.

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§elements: Rc<DenseLocationMap>

The map from locations to points.

§live_regions: Option<FxHashSet<RegionVid>>

Which regions are live. This is exclusive with the fine-grained tracking in points, and currently only used for validating promoteds (which don’t care about more precise tracking).

§points: Option<SparseIntervalMatrix<RegionVid, PointIndex>>

For each region: the points where it is live.

This is not initialized for promoteds, because we don’t care where within a promoted a region is live, only that it is.

§loans: Option<LiveLoans>

When using -Zpolonius=next, for each point: the loans flowing into the live regions at that point.

Implementations§

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impl LivenessValues

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pub(crate) fn with_specific_points(elements: Rc<DenseLocationMap>) -> Self

Create an empty map of regions to locations where they’re live.

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pub(crate) fn without_specific_points(elements: Rc<DenseLocationMap>) -> Self

Create an empty map of regions to locations where they’re live.

Unlike with_specific_points, does not track exact locations where something is live, only which regions are live.

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pub(crate) fn regions(&self) -> impl Iterator<Item = RegionVid> + '_

Iterate through each region that has a value in this set.

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pub(crate) fn live_regions_unordered( &self ) -> impl Iterator<Item = RegionVid> + '_

Iterate through each region that has a value in this set.

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pub(crate) fn add_location(&mut self, region: RegionVid, location: Location)

Records region as being live at the given location.

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pub(crate) fn add_points( &mut self, region: RegionVid, points: &IntervalSet<PointIndex> )

Records region as being live at all the given points.

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pub(crate) fn add_all_points(&mut self, region: RegionVid)

Records region as being live at all the control-flow points.

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pub(crate) fn is_live_at(&self, region: RegionVid, location: Location) -> bool

Returns whether region is marked live at the given location.

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fn live_points( &self, region: RegionVid ) -> impl Iterator<Item = PointIndex> + '_

Returns an iterator of all the points where region is live.

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pub(crate) fn pretty_print_live_points(&self, region: RegionVid) -> String

For debugging purposes, returns a pretty-printed string of the points where the region is live.

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pub(crate) fn point_from_location(&self, location: Location) -> PointIndex

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pub(crate) fn is_loan_live_at( &self, loan_idx: BorrowIndex, point: PointIndex ) -> bool

When using -Zpolonius=next, returns whether the loan_idx is live at the given point.

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Size: 136 bytes