Struct rustc_borrowck::dataflow::Borrows

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pub struct Borrows<'mir, 'tcx> {
    tcx: TyCtxt<'tcx>,
    body: &'mir Body<'tcx>,
    borrow_set: &'mir BorrowSet<'tcx>,
    borrows_out_of_scope_at_location: FxIndexMap<Location, Vec<BorrowIndex>>,
}
Expand description

Borrows stores the data used in the analyses that track the flow of borrows.

It uniquely identifies every borrow (Rvalue::Ref) by a BorrowIndex, and maps each such index to a BorrowData describing the borrow. These indexes are used for representing the borrows in compact bitvectors.

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§tcx: TyCtxt<'tcx>§body: &'mir Body<'tcx>§borrow_set: &'mir BorrowSet<'tcx>§borrows_out_of_scope_at_location: FxIndexMap<Location, Vec<BorrowIndex>>

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impl<'mir, 'tcx> Borrows<'mir, 'tcx>

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pub fn new( tcx: TyCtxt<'tcx>, body: &'mir Body<'tcx>, regioncx: &'mir RegionInferenceContext<'tcx>, borrow_set: &'mir BorrowSet<'tcx>, ) -> Self

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pub fn location(&self, idx: BorrowIndex) -> &Location

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fn kill_loans_out_of_scope_at_location( &self, trans: &mut impl GenKill<BorrowIndex>, location: Location, )

Add all borrows to the kill set, if those borrows are out of scope at location. That means they went out of a nonlexical scope

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fn kill_borrows_on_place( &self, trans: &mut impl GenKill<BorrowIndex>, place: Place<'tcx>, )

Kill any borrows that conflict with place.

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impl<'tcx> AnalysisDomain<'tcx> for Borrows<'_, 'tcx>

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type Domain = BitSet<BorrowIndex>

The type that holds the dataflow state at any given point in the program.
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const NAME: &'static str = "borrows"

A descriptive name for this analysis. Used only for debugging. Read more
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fn bottom_value(&self, _: &Body<'tcx>) -> Self::Domain

Returns the initial value of the dataflow state upon entry to each basic block.
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fn initialize_start_block(&self, _: &Body<'tcx>, _: &mut Self::Domain)

Mutates the initial value of the dataflow state upon entry to the START_BLOCK. Read more
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type Direction = Forward

The direction of this analysis. Either Forward or Backward.
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impl DebugWithContext<Borrows<'_, '_>> for BorrowIndex

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

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fn fmt_diff_with( &self, old: &Self, ctxt: &C, f: &mut Formatter<'_>, ) -> Result<(), Error>

Print the difference between self and old. Read more
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impl<'tcx> GenKillAnalysis<'tcx> for Borrows<'_, 'tcx>

Forward dataflow computation of the set of borrows that are in scope at a particular location.

  • we gen the introduced loans
  • we kill loans on locals going out of (regular) scope
  • we kill the loans going out of their region’s NLL scope: in NLL terms, the frontier where a region stops containing the CFG points reachable from the issuing location.
  • we also kill loans of conflicting places when overwriting a shared path: e.g. borrows of a.b.c when a is overwritten.
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type Idx = BorrowIndex

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fn domain_size(&self, _: &Body<'tcx>) -> usize

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fn before_statement_effect( &mut self, trans: &mut impl GenKill<Self::Idx>, _statement: &Statement<'tcx>, location: Location, )

See Analysis::apply_before_statement_effect. Note how the second arg differs.
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fn statement_effect( &mut self, trans: &mut impl GenKill<Self::Idx>, stmt: &Statement<'tcx>, location: Location, )

See Analysis::apply_statement_effect. Note how the second arg differs.
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fn before_terminator_effect( &mut self, trans: &mut Self::Domain, _terminator: &Terminator<'tcx>, location: Location, )

See Analysis::apply_before_terminator_effect.
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fn terminator_effect<'mir>( &mut self, trans: &mut Self::Domain, terminator: &'mir Terminator<'tcx>, _location: Location, ) -> TerminatorEdges<'mir, 'tcx>

See Analysis::apply_terminator_effect.
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fn call_return_effect( &mut self, _trans: &mut Self::Domain, _block: BasicBlock, _return_places: CallReturnPlaces<'_, 'tcx>, )

See Analysis::apply_call_return_effect.
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fn switch_int_edge_effects<G>( &mut self, _block: BasicBlock, _discr: &Operand<'tcx>, _edge_effects: &mut impl SwitchIntEdgeEffects<G>, )
where G: GenKill<Self::Idx>,

See Analysis::apply_switch_int_edge_effects.

Auto Trait Implementations§

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impl<'mir, 'tcx> DynSend for Borrows<'mir, 'tcx>

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impl<'mir, 'tcx> DynSync for Borrows<'mir, 'tcx>

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impl<'mir, 'tcx> Freeze for Borrows<'mir, 'tcx>

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impl<'mir, 'tcx> !RefUnwindSafe for Borrows<'mir, 'tcx>

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impl<'mir, 'tcx> !Send for Borrows<'mir, 'tcx>

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impl<'mir, 'tcx> !Sync for Borrows<'mir, 'tcx>

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impl<'mir, 'tcx> Unpin for Borrows<'mir, 'tcx>

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impl<'mir, 'tcx> !UnwindSafe for Borrows<'mir, 'tcx>

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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>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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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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impl<T> MaybeResult<T> for T

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type Error = !

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fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

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

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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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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>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion 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
where U: UpcastFrom<I, 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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impl<V, T> VZip<V> for T
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>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<'a, T> Captures<'a> for T
where T: ?Sized,

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

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: 80 bytes