Struct rustc_mir::borrow_check::borrow_set::GatherBorrows

struct GatherBorrows<'a, 'gcx: 'tcx, 'tcx: 'a> {
    tcx: TyCtxt<'a, 'gcx, 'tcx>,
    mir: &'a Mir<'tcx>,
    idx_vec: IndexVec<BorrowIndex, BorrowData<'tcx>>,
    location_map: FxHashMap<Location, BorrowIndex>,
    activation_map: FxHashMap<Location, Vec<BorrowIndex>>,
    region_map: FxHashMap<Region<'tcx>, FxHashSet<BorrowIndex>>,
    local_map: FxHashMap<Local, FxHashSet<BorrowIndex>>,
    pending_activations: FxHashMap<Local, BorrowIndex>,
    locals_state_at_exit: LocalsStateAtExit,
}

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Fields

tcx: TyCtxt<'a, 'gcx, 'tcx>

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mir: &'a Mir<'tcx>

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idx_vec: IndexVec<BorrowIndex, BorrowData<'tcx>>

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location_map: FxHashMap<Location, BorrowIndex>

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activation_map: FxHashMap<Location, Vec<BorrowIndex>>

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region_map: FxHashMap<Region<'tcx>, FxHashSet<BorrowIndex>>

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local_map: FxHashMap<Local, FxHashSet<BorrowIndex>>

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pending_activations: FxHashMap<Local, BorrowIndex>

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When we encounter a 2-phase borrow statement, it will always be assigning into a temporary TEMP:

TEMP = &foo

We add TEMP into this map with b, where b is the index of the borrow. When we find a later use of this activation, we remove from the map (and add to the "tombstone" set below).

locals_state_at_exit: LocalsStateAtExit

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Methods

impl<'a, 'gcx, 'tcx> GatherBorrows<'a, 'gcx, 'tcx>

fn allow_two_phase_borrow(&self, kind: BorrowKind) -> bool

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Returns true if the borrow represented by kind is allowed to be split into separate Reservation and Activation phases.

fn insert_as_pending_if_two_phase(     &mut self,     start_location: Location,     assigned_place: &Place<'tcx>,     region: Region<'tcx>,     kind: BorrowKind,     borrow_index: BorrowIndex )

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If this is a two-phase borrow, then we will record it as "pending" until we find the activating use.

Trait Implementations

impl<'a, 'gcx, 'tcx> Visitor<'tcx> for GatherBorrows<'a, 'gcx, 'tcx>

fn visit_assign(     &mut self,     block: BasicBlock,     assigned_place: &Place<'tcx>,     rvalue: &Rvalue<'tcx>,     location: Location )

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fn visit_place(     &mut self,     place: &Place<'tcx>,     context: PlaceContext<'tcx>,     location: Location )

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fn visit_rvalue(&mut self, rvalue: &Rvalue<'tcx>, location: Location)

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fn visit_statement(     &mut self,     block: BasicBlock,     statement: &Statement<'tcx>,     location: Location )

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fn visit_mir(&mut self, mir: &Mir<'tcx>)

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fn visit_basic_block_data(     &mut self,     block: BasicBlock,     data: &BasicBlockData<'tcx> )

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fn visit_source_scope_data(&mut self, scope_data: &SourceScopeData)

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fn visit_terminator(     &mut self,     block: BasicBlock,     terminator: &Terminator<'tcx>,     location: Location )

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fn visit_terminator_kind(     &mut self,     block: BasicBlock,     kind: &TerminatorKind<'tcx>,     location: Location )

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fn visit_assert_message(     &mut self,     msg: &EvalErrorKind<'tcx, Operand<'tcx>>,     location: Location )

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fn visit_operand(&mut self, operand: &Operand<'tcx>, location: Location)

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fn visit_ascribe_user_ty(     &mut self,     place: &Place<'tcx>,     variance: &Variance,     c_ty: &Canonical<'tcx, &'tcx TyS<'tcx>>,     location: Location )

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fn visit_static(     &mut self,     static_: &Static<'tcx>,     context: PlaceContext<'tcx>,     location: Location )

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fn visit_projection(     &mut self,     place: &Projection<'tcx, Place<'tcx>, Local, &'tcx TyS<'tcx>>,     context: PlaceContext<'tcx>,     location: Location )

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fn visit_projection_elem(     &mut self,     place: &ProjectionElem<'tcx, Local, &'tcx TyS<'tcx>>,     context: PlaceContext<'tcx>,     location: Location )

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fn visit_branch(&mut self, source: BasicBlock, target: BasicBlock)

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fn visit_constant(&mut self, constant: &Constant<'tcx>, location: Location)

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fn visit_def_id(&mut self, def_id: &DefId, Location)

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fn visit_span(&mut self, span: &Span)

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fn visit_source_info(&mut self, source_info: &SourceInfo)

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fn visit_ty(&mut self, ty: &&'tcx TyS<'tcx>, TyContext)

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fn visit_canonical_ty(&mut self, ty: &Canonical<'tcx, &'tcx TyS<'tcx>>)

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fn visit_region(&mut self, region: &&'tcx RegionKind, Location)

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fn visit_const(&mut self, constant: &&'tcx Const<'tcx>, Location)

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fn visit_substs(&mut self, substs: &&'tcx List<Kind<'tcx>>, Location)

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fn visit_closure_substs(&mut self, substs: &ClosureSubsts<'tcx>, Location)

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fn visit_generator_substs(&mut self, substs: &GeneratorSubsts<'tcx>, Location)

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fn visit_local_decl(&mut self, local: Local, local_decl: &LocalDecl<'tcx>)

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fn visit_local(     &mut self,     _local: &Local,     _context: PlaceContext<'tcx>,     _location: Location )

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fn visit_source_scope(&mut self, scope: &SourceScope)

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fn super_mir(&mut self, mir: &Mir<'tcx>)

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fn super_basic_block_data(     &mut self,     block: BasicBlock,     data: &BasicBlockData<'tcx> )

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fn super_source_scope_data(&mut self, scope_data: &SourceScopeData)

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fn super_statement(     &mut self,     block: BasicBlock,     statement: &Statement<'tcx>,     location: Location )

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fn super_assign(     &mut self,     _block: BasicBlock,     place: &Place<'tcx>,     rvalue: &Rvalue<'tcx>,     location: Location )

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fn super_terminator(     &mut self,     block: BasicBlock,     terminator: &Terminator<'tcx>,     location: Location )

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fn super_terminator_kind(     &mut self,     block: BasicBlock,     kind: &TerminatorKind<'tcx>,     source_location: Location )

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fn super_assert_message(     &mut self,     msg: &EvalErrorKind<'tcx, Operand<'tcx>>,     location: Location )

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fn super_rvalue(&mut self, rvalue: &Rvalue<'tcx>, location: Location)

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fn super_operand(&mut self, operand: &Operand<'tcx>, location: Location)

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fn super_ascribe_user_ty(     &mut self,     place: &Place<'tcx>,     _variance: &Variance,     c_ty: &Canonical<'tcx, &'tcx TyS<'tcx>>,     location: Location )

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fn super_place(     &mut self,     place: &Place<'tcx>,     context: PlaceContext<'tcx>,     location: Location )

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fn super_static(     &mut self,     static_: &Static<'tcx>,     _context: PlaceContext<'tcx>,     location: Location )

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fn super_projection(     &mut self,     proj: &Projection<'tcx, Place<'tcx>, Local, &'tcx TyS<'tcx>>,     context: PlaceContext<'tcx>,     location: Location )

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fn super_projection_elem(     &mut self,     proj: &ProjectionElem<'tcx, Local, &'tcx TyS<'tcx>>,     _context: PlaceContext<'tcx>,     location: Location )

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fn super_local_decl(&mut self, local: Local, local_decl: &LocalDecl<'tcx>)

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fn super_source_scope(&mut self, _scope: &SourceScope)

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fn super_branch(&mut self, _source: BasicBlock, _target: BasicBlock)

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fn super_constant(&mut self, constant: &Constant<'tcx>, location: Location)

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fn super_def_id(&mut self, _def_id: &DefId)

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fn super_span(&mut self, _span: &Span)

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fn super_source_info(&mut self, source_info: &SourceInfo)

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fn super_canonical_ty(&mut self, _ty: &Canonical<'tcx, &'tcx TyS<'tcx>>)

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fn super_ty(&mut self, _ty: &&'tcx TyS<'tcx>)

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fn super_region(&mut self, _region: &&'tcx RegionKind)

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fn super_const(&mut self, _const: &&'tcx Const<'tcx>)

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fn super_substs(&mut self, _substs: &&'tcx List<Kind<'tcx>>)

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fn super_generator_substs(&mut self, _substs: &GeneratorSubsts<'tcx>)

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fn super_closure_substs(&mut self, _substs: &ClosureSubsts<'tcx>)

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fn visit_location(&mut self, mir: &Mir<'tcx>, location: Location)

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