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>,
    source_scopes: IndexVec<SourceScope, SourceScopeData<'tcx>>,
    local_decls: IndexVec<Local, LocalDecl<'tcx>>,
    source_info: Option<SourceInfo>,
}

Finds optimization opportunities on the MIR.

Fields

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

tcx: TyCtxt<'tcx>

param_env: ParamEnv<'tcx>

source_scopes: IndexVec<SourceScope, SourceScopeData<'tcx>>

local_decls: IndexVec<Local, LocalDecl<'tcx>>

source_info: Option<SourceInfo>

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 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: &Constant<'tcx>,
    source_info: SourceInfo
) -> 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>,
    source_info: SourceInfo
) -> 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 report_assert_as_lint(
    &self,
    lint: &'static Lint,
    source_info: SourceInfo,
    message: &'static str,
    panic: AssertKind<impl Debug>
)

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

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

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

fn const_prop(
    &mut self,
    rvalue: &Rvalue<'tcx>,
    source_info: SourceInfo,
    place: Place<'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>,
    span: Span
) -> Operand<'tcx>

Creates a new Operand::Constant from a Scalar value

fn replace_with_const(
    &mut self,
    rval: &mut Rvalue<'tcx>,
    value: &OpTy<'tcx>,
    source_info: SourceInfo
)

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

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

Trait Implementations

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

fn data_layout(&self) -> &TargetDataLayout

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

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

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

type Ty = Ty<'tcx>

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

fn layout_of(&self, ty: Ty<'tcx>) -> Self::TyAndLayout

fn spanned_layout_of(&self, ty: Self::Ty, _span: Span) -> Self::TyAndLayout

impl<'mir, 'tcx> MutVisitor<'tcx> for ConstPropagator<'mir, '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 visit_constant(&mut self, constant: &mut Constant<'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_source_scope_data(&mut self, scope_data: &mut SourceScopeData<'tcx>)

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

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

fn process_projection_elem(
    &mut self,
    elem: ProjectionElem<Local, &'tcx TyS<'tcx>>,
    location: Location
) -> Option<ProjectionElem<Local, &'tcx TyS<'tcx>>>

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 &'tcx TyS<'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 &'tcx RegionKind, Location)

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

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

fn super_const(&mut self, _const: &mut &'tcx Const<'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 be different between compiler versions and platforms. 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: 328 bytes