Struct rustc_mir_dataflow::impls::liveness::MaybeLiveLocals
source · pub struct MaybeLiveLocals;
Expand description
A live-variable dataflow analysis.
This analysis considers references as being used only at the point of the
borrow. In other words, this analysis does not track uses because of references that already
exist. See this mir-dataflow
test for an example. You almost never want to use
this analysis without also looking at the results of MaybeBorrowedLocals
.
§Field-(in)sensitivity
As the name suggests, this analysis is field insensitive. If a projection of a variable x
is
assigned to (e.g. x.0 = 42
), it does not “define” x
as far as liveness is concerned. In fact,
such an assignment is currently marked as a “use” of x
in an attempt to be maximally
conservative.
Trait Implementations§
source§impl<'tcx> AnalysisDomain<'tcx> for MaybeLiveLocals
impl<'tcx> AnalysisDomain<'tcx> for MaybeLiveLocals
source§type Domain = BitSet<Local>
type Domain = BitSet<Local>
source§const NAME: &'static str = "liveness"
const NAME: &'static str = "liveness"
source§fn bottom_value(&self, body: &Body<'tcx>) -> Self::Domain
fn bottom_value(&self, body: &Body<'tcx>) -> Self::Domain
source§impl<'tcx> GenKillAnalysis<'tcx> for MaybeLiveLocals
impl<'tcx> GenKillAnalysis<'tcx> for MaybeLiveLocals
type Idx = Local
fn domain_size(&self, body: &Body<'tcx>) -> usize
source§fn statement_effect(
&mut self,
trans: &mut impl GenKill<Self::Idx>,
statement: &Statement<'tcx>,
location: Location,
)
fn statement_effect( &mut self, trans: &mut impl GenKill<Self::Idx>, statement: &Statement<'tcx>, location: Location, )
Analysis::apply_statement_effect
. Note how the second arg differs.source§fn terminator_effect<'mir>(
&mut self,
trans: &mut Self::Domain,
terminator: &'mir Terminator<'tcx>,
location: Location,
) -> TerminatorEdges<'mir, 'tcx>
fn terminator_effect<'mir>( &mut self, trans: &mut Self::Domain, terminator: &'mir Terminator<'tcx>, location: Location, ) -> TerminatorEdges<'mir, 'tcx>
Analysis::apply_terminator_effect
.source§fn call_return_effect(
&mut self,
trans: &mut Self::Domain,
_block: BasicBlock,
return_places: CallReturnPlaces<'_, 'tcx>,
)
fn call_return_effect( &mut self, trans: &mut Self::Domain, _block: BasicBlock, return_places: CallReturnPlaces<'_, 'tcx>, )
Analysis::apply_call_return_effect
.source§fn before_statement_effect(
&mut self,
_trans: &mut impl GenKill<Self::Idx>,
_statement: &Statement<'tcx>,
_location: Location,
)
fn before_statement_effect( &mut self, _trans: &mut impl GenKill<Self::Idx>, _statement: &Statement<'tcx>, _location: Location, )
Analysis::apply_before_statement_effect
. Note how the second arg
differs.source§fn before_terminator_effect(
&mut self,
_trans: &mut Self::Domain,
_terminator: &Terminator<'tcx>,
_location: Location,
)
fn before_terminator_effect( &mut self, _trans: &mut Self::Domain, _terminator: &Terminator<'tcx>, _location: Location, )
Analysis::apply_before_terminator_effect
.source§fn switch_int_edge_effects<G: GenKill<Self::Idx>>(
&mut self,
_block: BasicBlock,
_discr: &Operand<'tcx>,
_edge_effects: &mut impl SwitchIntEdgeEffects<G>,
)
fn switch_int_edge_effects<G: GenKill<Self::Idx>>( &mut self, _block: BasicBlock, _discr: &Operand<'tcx>, _edge_effects: &mut impl SwitchIntEdgeEffects<G>, )
Analysis::apply_switch_int_edge_effects
.Auto Trait Implementations§
impl Freeze for MaybeLiveLocals
impl RefUnwindSafe for MaybeLiveLocals
impl Send for MaybeLiveLocals
impl Sync for MaybeLiveLocals
impl Unpin for MaybeLiveLocals
impl UnwindSafe for MaybeLiveLocals
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
source§impl<T, R> CollectAndApply<T, R> for T
impl<T, R> CollectAndApply<T, R> for T
source§impl<T> Filterable for T
impl<T> Filterable for T
source§fn filterable(
self,
filter_name: &'static str,
) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>
fn filterable( self, filter_name: &'static str, ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>
source§impl<T> Instrument for T
impl<T> Instrument for T
source§fn instrument(self, span: Span) -> Instrumented<Self>
fn instrument(self, span: Span) -> Instrumented<Self>
source§fn in_current_span(self) -> Instrumented<Self>
fn in_current_span(self) -> Instrumented<Self>
source§impl<T> IntoEither for T
impl<T> IntoEither for T
source§fn into_either(self, into_left: bool) -> Either<Self, Self>
fn into_either(self, into_left: bool) -> Either<Self, Self>
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 moresource§fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
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 moresource§impl<P> IntoQueryParam<P> for P
impl<P> IntoQueryParam<P> for P
fn into_query_param(self) -> P
source§impl<T> MaybeResult<T> for T
impl<T> MaybeResult<T> for T
source§impl<I, T, U> Upcast<I, U> for Twhere
U: UpcastFrom<I, T>,
impl<I, T, U> Upcast<I, U> for Twhere
U: UpcastFrom<I, T>,
source§impl<I, T> UpcastFrom<I, T> for T
impl<I, T> UpcastFrom<I, T> for T
fn upcast_from(from: T, _tcx: I) -> T
source§impl<Tcx, T> Value<Tcx> for Twhere
Tcx: DepContext,
impl<Tcx, T> Value<Tcx> for Twhere
Tcx: DepContext,
default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed, ) -> T
source§impl<T> WithSubscriber for T
impl<T> WithSubscriber for T
source§fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
source§fn with_current_subscriber(self) -> WithDispatch<Self>
fn with_current_subscriber(self) -> WithDispatch<Self>
impl<'a, T> Captures<'a> for Twhere
T: ?Sized,
impl<T> ErasedDestructor for Twhere
T: 'static,
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.
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