Struct rustc_mir_transform::const_prop::ConstPropagator

struct ConstPropagator<'mir, 'tcx> {
    ecx: InterpCx<'mir, 'tcx, ConstPropMachine<'mir, 'tcx>>,
    tcx: TyCtxt<'tcx>,
    param_env: ParamEnv<'tcx>,
    local_decls: &'mir IndexSlice<Local, LocalDecl<'tcx>>,
}

Finds optimization opportunities on the MIR.

Fields

ecx: InterpCx<'mir, 'tcx, ConstPropMachine<'mir, 'tcx>>

tcx: TyCtxt<'tcx>

param_env: ParamEnv<'tcx>

local_decls: &'mir IndexSlice<Local, LocalDecl<'tcx>>

Implementations

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

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

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

fn remove_const( ecx: &mut InterpCx<'mir, 'tcx, ConstPropMachine<'mir, 'tcx>>, local: Local )

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

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

Returns the value, if any, of evaluating c.

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

Returns the value, if any, of evaluating place.

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

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

fn propagate_operand(&mut self, operand: &mut Operand<'tcx>)

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

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

fn operand_from_scalar(&self, scalar: Scalar, ty: Ty<'tcx>) -> Operand<'tcx>

Creates a new Operand::Constant from a Scalar value

fn replace_with_const(&mut self, place: Place<'tcx>, rval: &mut Rvalue<'tcx>)

fn should_const_prop(&mut self, op: &OpTy<'tcx>) -> bool

Returns true if and only if this op should be const-propagated into.

fn ensure_not_propagated(&self, local: Local)

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> MutVisitor<'tcx> for ConstPropagator<'_, 'tcx>

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

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

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

fn process_projection_elem( &mut self, elem: PlaceElem<'tcx>, _: Location ) -> Option<PlaceElem<'tcx>>

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

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

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

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

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

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

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

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

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

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

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

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

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

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

fn process_projection<'a>( &mut self, projection: &'a [ProjectionElem<Local, Ty<'tcx>>], location: Location ) -> Option<Vec<ProjectionElem<Local, Ty<'tcx>>, Global>>

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

fn visit_ty_const(&mut self, ct: &mut Const<'tcx>, location: Location)

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

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

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

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

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

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

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

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

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

fn visit_local( &mut self, _local: &mut Local, _context: PlaceContext, _location: Location )

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

fn super_ty_const(&mut self, _ct: &mut Const<'tcx>, _location: Location)

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

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

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

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

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

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

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

fn visit_location(&mut self, body: &mut 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:264 bytes