Struct rustc_mir::transform::simplify::UsedLocals

struct UsedLocals {
    increment: bool,
    arg_count: u32,
    use_count: IndexVec<Local, u32>,
}

Keeps track of used & unused locals.

Fields

increment: bool

arg_count: u32

use_count: IndexVec<Local, u32>

Implementations

impl UsedLocals

fn new(body: &Body<'_>) -> Self

Determines which locals are used & unused in the given body.

fn is_used(&self, local: Local) -> bool

Checks if local is used.

Return place and arguments are always considered used.

fn statement_removed<'tcx>(&mut self, statement: &Statement<'tcx>)

Updates the use counts to reflect the removal of given statement.

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

Visits a left-hand side of an assignment.

Trait Implementations

impl<'_> Visitor<'_> for UsedLocals

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

fn visit_local(
    &mut self,
    local: &Local,
    _ctx: PlaceContext,
    _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_assign(
    &mut self,
    place: &Place<'tcx>,
    rvalue: &Rvalue<'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_rvalue(&mut self, rvalue: &Rvalue<'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,
    local: Local,
    projection: &[ProjectionElem<Local, &'tcx TyS<'tcx>>],
    context: PlaceContext,
    location: Location
)

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

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

fn super_projection(
    &mut self,
    local: Local,
    projection: &[ProjectionElem<Local, &'tcx TyS<'tcx>>],
    context: PlaceContext,
    location: Location
)

fn super_projection_elem(
    &mut self,
    _local: Local,
    _proj_base: &[ProjectionElem<Local, &'tcx TyS<'tcx>>],
    elem: ProjectionElem<Local, &'tcx TyS<'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: &'tcx TyS<'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: &&'tcx RegionKind, Location)

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

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

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

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

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