Struct rustc::infer::region_constraints::RegionConstraintCollector[][src]

pub struct RegionConstraintCollector<'tcx> {
    var_infos: IndexVec<RegionVid, RegionVariableInfo>,
    data: RegionConstraintData<'tcx>,
    lubs: FxHashMap<TwoRegions<'tcx>, RegionVid>,
    glbs: FxHashMap<TwoRegions<'tcx>, RegionVid>,
    bound_count: u32,
    undo_log: Vec<UndoLogEntry<'tcx>>,
    unification_table: UnificationTable<InPlace<RegionVid>>,
    any_unifications: bool,
}
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Fields

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For each RegionVid, the corresponding RegionVariableOrigin.

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For a given pair of regions (R1, R2), maps to a region R3 that is designated as their LUB (edges R1 <= R3 and R2 <= R3 exist). This prevents us from making many such regions.

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For a given pair of regions (R1, R2), maps to a region R3 that is designated as their GLB (edges R3 <= R1 and R3 <= R2 exist). This prevents us from making many such regions.

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Global counter used during the GLB algorithm to create unique names for fresh bound regions

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The undo log records actions that might later be undone.

Note: when the undo_log is empty, we are not actively snapshotting. When the start_snapshot() method is called, we push an OpenSnapshot entry onto the list to indicate that we are now actively snapshotting. The reason for this is that otherwise we end up adding entries for things like the lower bound on a variable and so forth, which can never be rolled back.

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When we add a R1 == R2 constriant, we currently add (a) edges R1 <= R2 and R2 <= R1 and (b) we unify the two regions in this table. You can then call opportunistic_resolve_var early which will map R1 and R2 to some common region (i.e., either R1 or R2). This is important when dropck and other such code is iterating to a fixed point, because otherwise we sometimes would wind up with a fresh stream of region variables that have been equated but appear distinct.

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a flag set to true when we perform any unifications; this is used to micro-optimize take_and_reset_data

Methods

impl<'tcx> RegionConstraintCollector<'tcx>
[src]

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Once all the constraints have been gathered, extract out the final data.

Not legal during a snapshot.

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Takes (and clears) the current set of constraints. Note that the set of variables remains intact, but all relationships between them are reset. This is used during NLL checking to grab the set of constraints that arose from a particular operation.

We don't want to leak relationships between variables between points because just because (say) r1 == r2 was true at some point P in the graph doesn't imply that it will be true at some other point Q, in NLL.

Not legal during a snapshot.

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🔬 This is a nightly-only experimental API. (rustc_private)

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🔬 This is a nightly-only experimental API. (rustc_private)

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🔬 This is a nightly-only experimental API. (rustc_private)

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🔬 This is a nightly-only experimental API. (rustc_private)

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Returns the universe for the given variable.

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Returns the origin for the given variable.

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Removes all the edges to/from the skolemized regions that are in skols. This is used after a higher-ranked operation completes to remove all trace of the skolemized regions created in that time.

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🔬 This is a nightly-only experimental API. (rustc_private)

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See Verify::VerifyGenericBound

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🔬 This is a nightly-only experimental API. (rustc_private)

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🔬 This is a nightly-only experimental API. (rustc_private)

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Important traits for Vec<u8>

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Computes all regions that have been related to r0 since the mark mark was made---r0 itself will be the first entry. The directions parameter controls what kind of relations are considered. For example, one can say that only "incoming" edges to r0 are desired, in which case one will get the set of regions {r|r <= r0}. This is used when checking whether skolemized regions are being improperly related to other regions.

Auto Trait Implementations

impl<'tcx> !Send for RegionConstraintCollector<'tcx>

impl<'tcx> !Sync for RegionConstraintCollector<'tcx>