PoloniusLivenessContext

rustc_borrowck::polonius

Struct PoloniusLivenessContext 

Source 
pub(crate) struct PoloniusLivenessContext {
    live_region_variances: BTreeMap<RegionVid, ConstraintDirection>,
    pub(crate) boring_nll_locals: FxHashSet<Local>,
}
Expand description

This struct holds the liveness data created during MIR typeck, and which will be used later in the process, to compute the polonius localized constraints.

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§live_region_variances: BTreeMap<RegionVid, ConstraintDirection>

The expected edge direction per live region: the kind of directed edge we’ll create as liveness constraints depends on the variance of types with respect to each contained region.

§boring_nll_locals: FxHashSet<Local>

The regions that outlive free regions are used to distinguish relevant live locals from boring locals. A boring local is one whose type contains only such regions. Polonius currently has more boring locals than NLLs so we record the latter to use in errors and diagnostics, to focus on the locals we consider relevant and match NLL diagnostics.

Implementations§

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impl PoloniusLivenessContext

Source

pub(crate) fn record_live_region_variance<'tcx>( &mut self, tcx: TyCtxt<'tcx>, universal_regions: &UniversalRegions<'tcx>, value: impl TypeVisitable<TyCtxt<'tcx>> + Relate<TyCtxt<'tcx>>, )

Record the variance of each region contained within the given value.

Trait Implementations§

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impl Default for PoloniusLivenessContext

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fn default() -> PoloniusLivenessContext

Returns the “default value” for a type. Read more

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Size: 56 bytes