rustc_mir_dataflow::framework

Trait GenKillAnalysis

source 
pub trait GenKillAnalysis<'tcx>: Analysis<'tcx> {
    type Idx: Idx;

    // Required methods
    fn domain_size(&self, body: &Body<'tcx>) -> usize;
    fn statement_effect(
        &mut self,
        trans: &mut impl GenKill<Self::Idx>,
        statement: &Statement<'tcx>,
        location: Location,
    );
    fn terminator_effect<'mir>(
        &mut self,
        trans: &mut Self::Domain,
        terminator: &'mir Terminator<'tcx>,
        location: Location,
    ) -> TerminatorEdges<'mir, 'tcx>;
    fn call_return_effect(
        &mut self,
        trans: &mut Self::Domain,
        block: BasicBlock,
        return_places: CallReturnPlaces<'_, 'tcx>,
    );

    // Provided methods
    fn before_statement_effect(
        &mut self,
        _trans: &mut impl GenKill<Self::Idx>,
        _statement: &Statement<'tcx>,
        _location: Location,
    ) { ... }
    fn before_terminator_effect(
        &mut self,
        _trans: &mut Self::Domain,
        _terminator: &Terminator<'tcx>,
        _location: Location,
    ) { ... }
    fn switch_int_edge_effects<G: GenKill<Self::Idx>>(
        &mut self,
        _block: BasicBlock,
        _discr: &Operand<'tcx>,
        _edge_effects: &mut impl SwitchIntEdgeEffects<G>,
    ) { ... }
}
Expand description

A gen/kill dataflow problem.

Each method in this trait has a corresponding one in Analysis. However, the first two methods here only allow modification of the dataflow state via “gen” and “kill” operations. By defining transfer functions for each statement in this way, the transfer function for an entire basic block can be computed efficiently. The remaining methods match up with Analysis exactly.

Analysis is automatically implemented for all implementers of GenKillAnalysis via a blanket impl below.

Required Associated Types§

source

type Idx: Idx

Required Methods§

source

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, )

See 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>

See Analysis::apply_terminator_effect.

source

fn call_return_effect( &mut self, trans: &mut Self::Domain, block: BasicBlock, return_places: CallReturnPlaces<'_, 'tcx>, )

See Analysis::apply_call_return_effect.

Provided Methods§

source

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.

source

fn before_terminator_effect( &mut self, _trans: &mut Self::Domain, _terminator: &Terminator<'tcx>, _location: Location, )

See 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>, )

See Analysis::apply_switch_int_edge_effects.

Object Safety§

This trait is not object safe.

Implementors§