Struct rustc_mir::dataflow::impls::liveness::MaybeLiveLocals

pub struct MaybeLiveLocals;

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.

Implementations

impl MaybeLiveLocals

pub(in dataflow::impls::liveness) fn transfer_function<T, 'a>(
    &self,
    trans: &'a mut T
) -> TransferFunction<'a, T>

Trait Implementations

impl<'tcx> AnalysisDomain<'tcx> for MaybeLiveLocals

type Domain = BitSet<Local>

The type that holds the dataflow state at any given point in the program.

type Direction = Backward

The direction of this analysis. Either Forward or Backward.

pub const NAME: &'static str

A descriptive name for this analysis. Used only for debugging.

pub fn bottom_value(&self, body: &Body<'tcx>) -> Self::Domain

The initial value of the dataflow state upon entry to each basic block.

pub fn initialize_start_block(&self, _: &Body<'tcx>, _: &mut Self::Domain)

Mutates the initial value of the dataflow state upon entry to the START_BLOCK.

impl<'tcx> GenKillAnalysis<'tcx> for MaybeLiveLocals

type Idx = Local

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

See Analysis::apply_statement_effect.

pub fn terminator_effect(
    &self,
    trans: &mut impl GenKill<Self::Idx>,
    terminator: &Terminator<'tcx>,
    location: Location
)

See Analysis::apply_terminator_effect.

pub fn call_return_effect(
    &self,
    trans: &mut impl GenKill<Self::Idx>,
    _block: BasicBlock,
    _func: &Operand<'tcx>,
    _args: &[Operand<'tcx>],
    dest_place: Place<'tcx>
)

See Analysis::apply_call_return_effect.

pub fn yield_resume_effect(
    &self,
    trans: &mut impl GenKill<Self::Idx>,
    _resume_block: BasicBlock,
    resume_place: Place<'tcx>
)

See Analysis::apply_yield_resume_effect.

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

See Analysis::apply_before_statement_effect.

pub fn before_terminator_effect(
    &self,
    _trans: &mut impl GenKill<Self::Idx>,
    _terminator: &Terminator<'tcx>,
    _location: Location
)

See Analysis::apply_before_terminator_effect.

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

See Analysis::apply_switch_int_edge_effects.

impl<'tcx> RustcPeekAt<'tcx> for MaybeLiveLocals

pub fn peek_at(
    &self,
    tcx: TyCtxt<'tcx>,
    place: Place<'tcx>,
    flow_state: &BitSet<Local>,
    call: PeekCall
)