Struct rustc_mir_dataflow::impls::MaybeBorrowedLocals

pub struct MaybeBorrowedLocals;

A dataflow analysis that tracks whether a pointer or reference could possibly exist that points to a given local. This analysis ignores fake borrows, so it should not be used by borrowck.

At present, this is used as a very limited form of alias analysis. For example, MaybeBorrowedLocals is used to compute which locals are live during a yield expression for immovable coroutines.

Implementations

impl MaybeBorrowedLocals

pub(super) fn transfer_function<'a, T>( &'a self, trans: &'a mut T ) -> TransferFunction<'a, T>

Trait Implementations

impl<'tcx> AnalysisDomain<'tcx> for MaybeBorrowedLocals

type Domain = BitSet<Local>

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

const NAME: &'static str = "maybe_borrowed_locals"

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

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

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

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

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

type Direction = Forward

The direction of this analysis. Either Forward or Backward.

impl Clone for MaybeBorrowedLocals

fn clone(&self) -> MaybeBorrowedLocals

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'tcx> GenKillAnalysis<'tcx> for MaybeBorrowedLocals

type Idx = Local

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

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.

fn terminator_effect<'mir>( &mut self, trans: &mut Self::Domain, terminator: &'mir Terminator<'tcx>, location: Location ) -> TerminatorEdges<'mir, 'tcx>

See Analysis::apply_terminator_effect.

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

See Analysis::apply_call_return_effect.

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.

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

See Analysis::apply_before_terminator_effect.

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.

impl Copy for MaybeBorrowedLocals

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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