pub(crate) struct MemberConstraintSet<'tcx, R>
where R: Copy + Eq,
{ first_constraints: FxIndexMap<R, NllMemberConstraintIndex>, constraints: IndexVec<NllMemberConstraintIndex, NllMemberConstraint<'tcx>>, choice_regions: Vec<RegionVid>, }
Expand description

Compactly stores a set of R0 member of [R1...Rn] constraints, indexed by the region R0.

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§first_constraints: FxIndexMap<R, NllMemberConstraintIndex>

Stores the first “member” constraint for a given R0. This is an index into the constraints vector below.

§constraints: IndexVec<NllMemberConstraintIndex, NllMemberConstraint<'tcx>>

Stores the data about each R0 member of [R1..Rn] constraint. These are organized into a linked list, so each constraint contains the index of the next constraint with the same R0.

§choice_regions: Vec<RegionVid>

Stores the R1..Rn regions for all sets. For any given constraint, we keep two indices so that we can pull out a slice.

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impl<'tcx> MemberConstraintSet<'tcx, RegionVid>

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pub(crate) fn push_constraint( &mut self, m_c: &MemberConstraint<'tcx>, to_region_vid: impl FnMut(Region<'tcx>) -> RegionVid, )

Pushes a member constraint into the set.

The input member constraint m_c is in the form produced by the rustc_middle::infer code.

The to_region_vid callback fn is used to convert the regions within into RegionVid format – it typically consults the UniversalRegions data structure that is known to the caller (but which this code is unaware of).

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impl<'tcx, R1> MemberConstraintSet<'tcx, R1>
where R1: Copy + Hash + Eq,

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pub(crate) fn into_mapped<R2>( self, map_fn: impl FnMut(R1) -> R2, ) -> MemberConstraintSet<'tcx, R2>
where R2: Copy + Hash + Eq,

Remap the “member region” key using map_fn, producing a new member constraint set. This is used in the NLL code to map from the original RegionVid to an scc index. In some cases, we may have multiple R1 values mapping to the same R2 key – that is ok, the two sets will be merged.

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impl<'tcx, R> MemberConstraintSet<'tcx, R>
where R: Copy + Hash + Eq,

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pub(crate) fn all_indices( &self, ) -> impl Iterator<Item = NllMemberConstraintIndex> + Captures<'tcx> + '_

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pub(crate) fn indices( &self, member_region_vid: R, ) -> impl Iterator<Item = NllMemberConstraintIndex> + Captures<'tcx> + '_

Iterate down the constraint indices associated with a given peek-region. You can then use choice_regions and other methods to access data.

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pub(crate) fn choice_regions( &self, pci: NllMemberConstraintIndex, ) -> &[RegionVid]

Returns the “choice regions” for a given member constraint. This is the R1..Rn from a constraint like:

R0 member of [R1..Rn]

Trait Implementations§

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impl<'tcx, R> Debug for MemberConstraintSet<'tcx, R>
where R: Copy + Eq + Debug,

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Default for MemberConstraintSet<'_, RegionVid>

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<'tcx, R> Index<NllMemberConstraintIndex> for MemberConstraintSet<'tcx, R>
where R: Copy + Eq,

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type Output = NllMemberConstraint<'tcx>

The returned type after indexing.
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fn index(&self, i: NllMemberConstraintIndex) -> &NllMemberConstraint<'tcx>

Performs the indexing (container[index]) operation. Read more

Auto Trait Implementations§

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impl<'tcx, R> Freeze for MemberConstraintSet<'tcx, R>

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impl<'tcx, R> !RefUnwindSafe for MemberConstraintSet<'tcx, R>

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impl<'tcx, R> !Send for MemberConstraintSet<'tcx, R>

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impl<'tcx, R> !Sync for MemberConstraintSet<'tcx, R>

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impl<'tcx, R> Unpin for MemberConstraintSet<'tcx, R>
where R: Unpin,

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impl<'tcx, R> !UnwindSafe for MemberConstraintSet<'tcx, R>

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T, R> CollectAndApply<T, R> for T

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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impl<T> Filterable for T

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fn filterable( self, filter_name: &'static str, ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

Creates a filterable data provider with the given name for debugging. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<P> IntoQueryParam<P> for P

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type Error = !

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fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

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impl<T, U> TryInto<U> for T
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type Error = <U as TryFrom<T>>::Error

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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<I, T, U> Upcast<I, U> for T
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fn upcast(self, interner: I) -> U

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impl<I, T> UpcastFrom<I, T> for T

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fn upcast_from(from: T, _tcx: I) -> T

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where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<Tcx, T> Value<Tcx> for T
where Tcx: DepContext,

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default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed, ) -> T

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

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impl<'a, T> Captures<'a> for T
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impl<T> ErasedDestructor for T
where T: 'static,

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impl<T> MaybeSendSync for T

Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 104 bytes