Struct ConstPropagator

struct ConstPropagator<'mir, 'tcx> {
    ecx: InterpCx<'tcx, DummyMachine>,
    tcx: TyCtxt<'tcx>,
    param_env: ParamEnv<'tcx>,
    worklist: Vec<BasicBlock>,
    visited_blocks: BitSet<BasicBlock>,
    locals: IndexVec<Local, Value<'tcx>>,
    body: &'mir Body<'tcx>,
    written_only_inside_own_block_locals: FxHashSet<Local>,
    can_const_prop: IndexVec<Local, ConstPropMode>,
}

Visits MIR nodes, performs const propagation and runs lint checks as it goes

Fields

ecx: InterpCx<'tcx, DummyMachine>

tcx: TyCtxt<'tcx>

param_env: ParamEnv<'tcx>

worklist: Vec<BasicBlock>

visited_blocks: BitSet<BasicBlock>

locals: IndexVec<Local, Value<'tcx>>

body: &'mir Body<'tcx>

written_only_inside_own_block_locals: FxHashSet<Local>

can_const_prop: IndexVec<Local, ConstPropMode>

Implementations

impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx>

fn new(body: &'mir Body<'tcx>, tcx: TyCtxt<'tcx>) -> ConstPropagator<'mir, 'tcx>

fn local_decls(&self) -> &'mir LocalDecls<'tcx>

fn get_const(&self, place: Place<'tcx>) -> Option<&Value<'tcx>>

fn remove_const(&mut self, local: Local)

Remove local from the pool of Locals. Allows writing to them, but not reading from them anymore.

fn access_mut(&mut self, place: &Place<'_>) -> Option<&mut Value<'tcx>>

fn lint_root(&self, source_info: SourceInfo) -> Option<HirId>

fn use_ecx<F, T>(&mut self, f: F) -> Option<T>

where F: FnOnce(&mut Self) -> InterpResult<'tcx, T>,

fn eval_constant(&mut self, c: &ConstOperand<'tcx>) -> Option<ImmTy<'tcx>>

Returns the value, if any, of evaluating c.

fn eval_place(&mut self, place: Place<'tcx>) -> Option<ImmTy<'tcx>>

Returns the value, if any, of evaluating place.

fn eval_operand(&mut self, op: &Operand<'tcx>) -> Option<ImmTy<'tcx>>

Returns the value, if any, of evaluating op. Calls upon eval_constant or eval_place, depending on the variant of Operand used.

fn report_assert_as_lint( &self, location: Location, lint_kind: AssertLintKind, assert_kind: AssertKind<impl Debug>, )

fn check_unary_op( &mut self, op: UnOp, arg: &Operand<'tcx>, location: Location, ) -> Option<()>

fn check_binary_op( &mut self, op: BinOp, left: &Operand<'tcx>, right: &Operand<'tcx>, location: Location, ) -> Option<()>

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

fn check_assertion( &mut self, expected: bool, msg: &AssertKind<Operand<'tcx>>, cond: &Operand<'tcx>, location: Location, )

fn ensure_not_propagated(&self, local: Local)

fn eval_rvalue( &mut self, rvalue: &Rvalue<'tcx>, dest: &Place<'tcx>, ) -> Option<()>

Trait Implementations

impl HasDataLayout for ConstPropagator<'_, '_>

fn data_layout(&self) -> &TargetDataLayout

impl<'tcx> HasParamEnv<'tcx> for ConstPropagator<'_, 'tcx>

fn param_env(&self) -> ParamEnv<'tcx>

impl<'tcx> HasTyCtxt<'tcx> for ConstPropagator<'_, 'tcx>

fn tcx(&self) -> TyCtxt<'tcx>

impl<'tcx> LayoutOfHelpers<'tcx> for ConstPropagator<'_, 'tcx>

type LayoutOfResult = Result<TyAndLayout<'tcx, Ty<'tcx>>, LayoutError<'tcx>>

The TyAndLayout-wrapping type (or TyAndLayout itself), which will be returned from layout_of (see also handle_layout_err).

fn handle_layout_err( &self, err: LayoutError<'tcx>, _: Span, _: Ty<'tcx>, ) -> LayoutError<'tcx>

Helper used for layout_of, to adapt tcx.layout_of(...) into a Self::LayoutOfResult (which does not need to be a Result<...>).

fn layout_tcx_at_span(&self) -> Span

Span to use for tcx.at(span), from layout_of.

impl<'tcx> Visitor<'tcx> for ConstPropagator<'_, 'tcx>

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

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

fn visit_const_operand( &mut self, constant: &ConstOperand<'tcx>, location: Location, )

This is called for every constant in the MIR body and every required_consts (i.e., including consts that have been dead-code-eliminated).

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

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

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

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

fn visit_rvalue(&mut self, rvalue: &Rvalue<'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, kind: &CoverageKind, 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, place_ref: PlaceRef<'tcx>, elem: ProjectionElem<Local, 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, _place_ref: PlaceRef<'tcx>, elem: ProjectionElem<Local, Ty<'tcx>>, _context: PlaceContext, location: Location, )

fn visit_ty_const(&mut self, ct: Const<'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_args( &mut self, args: &&'tcx RawList<(), 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_local( &mut self, _local: Local, _context: PlaceContext, _location: Location, )

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, _kind: &CoverageKind, _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_const_operand( &mut self, constant: &ConstOperand<'tcx>, location: Location, )

fn super_ty_const(&mut self, _ct: Const<'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_args(&mut self, _args: &&'tcx RawList<(), 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: 368 bytes