Struct rustc_borrowck::borrow_set::GatherBorrows

struct GatherBorrows<'a, 'tcx> {
    tcx: TyCtxt<'tcx>,
    body: &'a Body<'tcx>,
    location_map: FxIndexMap<Location, BorrowData<'tcx>>,
    activation_map: FxHashMap<Location, Vec<BorrowIndex>>,
    local_map: FxHashMap<Local, FxHashSet<BorrowIndex>>,
    pending_activations: FxHashMap<Local, BorrowIndex>,
    locals_state_at_exit: LocalsStateAtExit,
}

Fields

tcx: TyCtxt<'tcx>

body: &'a Body<'tcx>

location_map: FxIndexMap<Location, BorrowData<'tcx>>

activation_map: FxHashMap<Location, Vec<BorrowIndex>>

local_map: FxHashMap<Local, FxHashSet<BorrowIndex>>

pending_activations: FxHashMap<Local, BorrowIndex>

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

Implementations

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

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

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

Trait Implementations

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

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

fn visit_local(&mut self, temp: Local, context: PlaceContext, location: Location)

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

fn visit_body(&mut self, body: &Body<'tcx>)

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

fn visit_source_scope_data(&mut self, scope_data: &SourceScopeData<'tcx>)

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

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

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

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

fn visit_ascribe_user_ty(
    &mut self,
    place: &Place<'tcx>,
    variance: Variance,
    user_ty: &UserTypeProjection,
    location: Location
)

fn visit_coverage(&mut self, coverage: &Coverage, location: Location)

fn visit_retag(&mut self, kind: RetagKind, place: &Place<'tcx>, location: Location)

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

fn visit_projection(
    &mut self,
    place_ref: PlaceRef<'tcx>,
    context: PlaceContext,
    location: Location
)

fn visit_projection_elem(
    &mut self,
    local: Local,
    proj_base: &[ProjectionElem<Local, Ty<'tcx>, Ty<'tcx>>],
    elem: ProjectionElem<Local, Ty<'tcx>, Ty<'tcx>>,
    context: PlaceContext,
    location: Location
)

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

fn super_projection(
    &mut self,
    place_ref: PlaceRef<'tcx>,
    context: PlaceContext,
    location: Location
)

fn super_projection_elem(
    &mut self,
    _local: Local,
    _proj_base: &[ProjectionElem<Local, Ty<'tcx>, Ty<'tcx>>],
    elem: ProjectionElem<Local, Ty<'tcx>, Ty<'tcx>>,
    _context: PlaceContext,
    location: Location
)

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

fn visit_span(&mut self, span: Span)

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

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

fn visit_user_type_projection(&mut self, ty: &UserTypeProjection)

fn visit_user_type_annotation(
    &mut self,
    index: UserTypeAnnotationIndex,
    ty: &CanonicalUserTypeAnnotation<'tcx>
)

fn visit_region(&mut self, region: Region<'tcx>, _: Location)

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

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

fn visit_var_debug_info(&mut self, var_debug_info: &VarDebugInfo<'tcx>)

fn visit_source_scope(&mut self, scope: SourceScope)

fn super_body(&mut self, body: &Body<'tcx>)

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

fn super_source_scope_data(&mut self, scope_data: &SourceScopeData<'tcx>)

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

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

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

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

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

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

fn super_ascribe_user_ty(
    &mut self,
    place: &Place<'tcx>,
    _variance: Variance,
    user_ty: &UserTypeProjection,
    location: Location
)

fn super_coverage(&mut self, _coverage: &Coverage, _location: Location)

fn super_retag(
    &mut self,
    _kind: RetagKind,
    place: &Place<'tcx>,
    location: Location
)

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

fn super_var_debug_info(&mut self, var_debug_info: &VarDebugInfo<'tcx>)

fn super_source_scope(&mut self, _scope: SourceScope)

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

fn super_span(&mut self, _span: Span)

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

fn super_user_type_projection(&mut self, _ty: &UserTypeProjection)

fn super_user_type_annotation(
    &mut self,
    _index: UserTypeAnnotationIndex,
    ty: &CanonicalUserTypeAnnotation<'tcx>
)

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

fn super_region(&mut self, _region: Region<'tcx>)

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

fn visit_location(&mut self, body: &Body<'tcx>, location: Location)

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.

Size: 200 bytes