Struct rustc_borrowck::borrowck::move_data::MoveData

pub struct MoveData<'tcx> {
    pub paths: RefCell<Vec<MovePath<'tcx>>>,
    pub path_map: RefCell<FxHashMap<Rc<LoanPath<'tcx>>, MovePathIndex>>,
    pub moves: RefCell<Vec<Move>>,
    pub var_assignments: RefCell<Vec<Assignment>>,
    pub path_assignments: RefCell<Vec<Assignment>>,
    pub assignee_ids: RefCell<FxHashSet<ItemLocalId>>,
}

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Fields

paths: RefCell<Vec<MovePath<'tcx>>>

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Move paths. See section "Move paths" in README.md.

path_map: RefCell<FxHashMap<Rc<LoanPath<'tcx>>, MovePathIndex>>

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Cache of loan path to move path index, for easy lookup.

moves: RefCell<Vec<Move>>

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Each move or uninitialized variable gets an entry here.

var_assignments: RefCell<Vec<Assignment>>

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Assignments to a variable, like x = foo. These are assigned bits for dataflow, since we must track them to ensure that immutable variables are assigned at most once along each path.

path_assignments: RefCell<Vec<Assignment>>

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Assignments to a path, like x.f = foo. These are not assigned dataflow bits, but we track them because they still kill move bits.

assignee_ids: RefCell<FxHashSet<ItemLocalId>>

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Assignments to a variable or path, like x = foo, but not x += foo.

Methods

impl<'a, 'tcx> MoveData<'tcx>

pub fn is_empty(&self) -> bool

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return true if there are no trackable assignments or moves in this move data - that means that there is nothing that could cause a borrow error.

pub fn path_loan_path(&self, index: MovePathIndex) -> Rc<LoanPath<'tcx>>

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fn path_parent(&self, index: MovePathIndex) -> MovePathIndex

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fn path_first_move(&self, index: MovePathIndex) -> MoveIndex

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fn path_first_child(&self, index: MovePathIndex) -> MovePathIndex

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Returns the index of first child, or InvalidMovePathIndex if index is leaf.

fn path_next_sibling(&self, index: MovePathIndex) -> MovePathIndex

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fn set_path_first_move(&self, index: MovePathIndex, first_move: MoveIndex)

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fn set_path_first_child(&self, index: MovePathIndex, first_child: MovePathIndex)

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fn move_next_move(&self, index: MoveIndex) -> MoveIndex

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Type safe indexing operator

fn is_var_path(&self, index: MovePathIndex) -> bool

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True if index refers to a variable

pub fn move_path(     &self,     tcx: TyCtxt<'a, 'tcx, 'tcx>,     lp: Rc<LoanPath<'tcx>> ) -> MovePathIndex

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Returns the existing move path index for lp, if any, and otherwise adds a new index for lp and any of its base paths that do not yet have an index.

fn existing_move_path(&self, lp: &Rc<LoanPath<'tcx>>) -> Option<MovePathIndex>

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Important traits for Vec<u8>

impl Write for Vec<u8>

fn existing_base_paths(&self, lp: &Rc<LoanPath<'tcx>>) -> Vec<MovePathIndex>

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fn add_existing_base_paths(     &self,     lp: &Rc<LoanPath<'tcx>>,     result: &mut Vec<MovePathIndex> )

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Adds any existing move path indices for lp and any base paths of lp to result, but does not add new move paths

pub fn add_move(     &self,     tcx: TyCtxt<'a, 'tcx, 'tcx>,     orig_lp: Rc<LoanPath<'tcx>>,     id: ItemLocalId,     kind: MoveKind )

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Adds a new move entry for a move of lp that occurs at location id with kind kind.

fn add_move_helper(     &self,     tcx: TyCtxt<'a, 'tcx, 'tcx>,     lp: Rc<LoanPath<'tcx>>,     id: ItemLocalId,     kind: MoveKind )

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pub fn add_assignment(     &self,     tcx: TyCtxt<'a, 'tcx, 'tcx>,     lp: Rc<LoanPath<'tcx>>,     assign_id: ItemLocalId,     span: Span,     assignee_id: ItemLocalId,     mode: MutateMode )

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Adds a new record for an assignment to lp that occurs at location id with the given span.

fn add_assignment_helper(     &self,     tcx: TyCtxt<'a, 'tcx, 'tcx>,     lp: Rc<LoanPath<'tcx>>,     assign_id: ItemLocalId,     span: Span,     assignee_id: ItemLocalId,     mode: MutateMode )

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fn add_gen_kills(     &self,     bccx: &BorrowckCtxt<'a, 'tcx>,     dfcx_moves: &mut DataFlowContext<'a, 'tcx, MoveDataFlowOperator>,     dfcx_assign: &mut DataFlowContext<'a, 'tcx, AssignDataFlowOperator> )

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Adds the gen/kills for the various moves and assignments into the provided data flow contexts. Moves are generated by moves and killed by assignments and scoping. Assignments are generated by assignment to variables and killed by scoping. See README.md for more details.

fn each_base_path<F>(&self, index: MovePathIndex, f: F) -> bool where     F: FnMut(MovePathIndex) -> bool,

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fn each_extending_path_<F>(&self, index: MovePathIndex, f: &mut F) -> bool where     F: FnMut(MovePathIndex) -> bool,

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fn each_extending_path<F>(&self, index: MovePathIndex, f: F) -> bool where     F: FnMut(MovePathIndex) -> bool,

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fn each_applicable_move<F>(&self, index0: MovePathIndex, f: F) -> bool where     F: FnMut(MoveIndex) -> bool,

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fn kill_moves(     &self,     path: MovePathIndex,     kill_id: ItemLocalId,     kill_kind: KillFrom,     dfcx_moves: &mut DataFlowContext<'a, 'tcx, MoveDataFlowOperator> )

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Trait Implementations

impl<'tcx> Default for MoveData<'tcx>

fn default() -> MoveData<'tcx>

Returns the "default value" for a type.