Struct 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>( trans: &'a mut T, ) -> TransferFunction<'a, T>

Trait Implementations

impl<'tcx> Analysis<'tcx> for MaybeBorrowedLocals

const NAME: &'static str = "maybe_borrowed_locals"

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

type Domain = BitSet<Local>

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

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.

fn apply_primary_statement_effect( &mut self, state: &mut Self::Domain, statement: &Statement<'tcx>, location: Location, )

Updates the current dataflow state with the effect of evaluating a statement.

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

Updates the current dataflow state with the effect of evaluating a terminator.

type Direction = Forward

The direction of this analysis. Either Forward or Backward.

fn apply_early_statement_effect( &mut self, _state: &mut Self::Domain, _statement: &Statement<'tcx>, _location: Location, )

Updates the current dataflow state with an “early” effect, i.e. one that occurs immediately before the given statement.

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

Updates the current dataflow state with an effect that occurs immediately before the given terminator.

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

Updates the current dataflow state with the effect of a successful return from a Call terminator.

fn apply_switch_int_edge_effects( &mut self, _block: BasicBlock, _discr: &Operand<'tcx>, _apply_edge_effects: &mut impl SwitchIntEdgeEffects<Self::Domain>, )

Updates the current dataflow state with the effect of taking a particular branch in a SwitchInt terminator.

fn iterate_to_fixpoint<'mir>( self, tcx: TyCtxt<'tcx>, body: &'mir Body<'tcx>, pass_name: Option<&'static str>, ) -> Results<'tcx, Self>

where Self: Sized, Self::Domain: DebugWithContext<Self>,

Finds the fixpoint for this dataflow problem.

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.

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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