rustc_mir_transform::known_panics_lint

Struct ConstPropagator

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struct ConstPropagator<'mir, 'tcx> {
    ecx: InterpCx<'tcx, DummyMachine>,
    tcx: TyCtxt<'tcx>,
    typing_env: TypingEnv<'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>,
}
Expand description

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

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§ecx: InterpCx<'tcx, DummyMachine>§tcx: TyCtxt<'tcx>§typing_env: TypingEnv<'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>

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

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

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

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

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fn remove_const(&mut self, local: Local)

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

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

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

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fn use_ecx<F, T>(&mut self, f: F) -> Option<T>
where F: FnOnce(&mut Self) -> InterpResult<'tcx, T>,

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

Returns the value, if any, of evaluating c.

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

Returns the value, if any, of evaluating place.

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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.

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

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

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

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

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

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fn ensure_not_propagated(&self, local: Local)

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

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impl HasDataLayout for ConstPropagator<'_, '_>

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

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

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

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fn typing_env(&self) -> TypingEnv<'tcx>

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

FIXME(#132279): This method should not be used as in the future everything should take a TypingEnv instead. Remove it as that point.
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impl<'tcx> LayoutOfHelpers<'tcx> for ConstPropagator<'_, 'tcx>

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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).
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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<...>). Read more
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fn layout_tcx_at_span(&self) -> Span

Span to use for tcx.at(span), from layout_of.
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impl<'tcx> Visitor<'tcx> for ConstPropagator<'_, 'tcx>

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

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

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

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

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

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

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

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

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

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

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fn visit_coverage(&mut self, kind: &CoverageKind, location: Location)

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

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

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

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fn visit_projection_elem( &mut self, place_ref: PlaceRef<'tcx>, elem: ProjectionElem<Local, Ty<'tcx>>, context: PlaceContext, location: Location, )

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

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

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fn super_projection_elem( &mut self, _place_ref: PlaceRef<'tcx>, elem: ProjectionElem<Local, Ty<'tcx>>, _context: PlaceContext, location: Location, )

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

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fn visit_span(&mut self, span: Span)

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

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

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

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

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

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fn visit_args( &mut self, args: &&'tcx RawList<(), GenericArg<'tcx>>, _: Location, )

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

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

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

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fn visit_source_scope(&mut self, scope: SourceScope)

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

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

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

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

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

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

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

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

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

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

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fn super_coverage(&mut self, _kind: &CoverageKind, _location: Location)

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

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

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

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fn super_source_scope(&mut self, _scope: SourceScope)

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

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

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fn super_span(&mut self, _span: Span)

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

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

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

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

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

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fn super_args(&mut self, _args: &&'tcx RawList<(), GenericArg<'tcx>>)

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

Auto Trait Implementations§

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

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

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

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impl<'mir, 'tcx> !RefUnwindSafe for ConstPropagator<'mir, 'tcx>

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impl<'mir, 'tcx> !Send for ConstPropagator<'mir, 'tcx>

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impl<'mir, 'tcx> !Sync for ConstPropagator<'mir, 'tcx>

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

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impl<'mir, 'tcx> !UnwindSafe for ConstPropagator<'mir, 'tcx>

Blanket Implementations§

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impl<T> Aligned for T

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const ALIGN: Alignment = _

Alignment of Self.
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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T, R> CollectAndApply<T, R> for T

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fn collect_and_apply<I, F>(iter: I, f: F) -> R
where I: Iterator<Item = T>, F: FnOnce(&[T]) -> R,

Equivalent to f(&iter.collect::<Vec<_>>()).

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type Output = R

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impl<T> Filterable for T

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fn filterable( self, filter_name: &'static str, ) -> RequestFilterDataProvider<T, fn(_: DataRequest<'_>) -> bool>

Creates a filterable data provider with the given name for debugging. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<P> IntoQueryParam<P> for P

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impl<'tcx, C> LayoutOf<'tcx> for C
where C: LayoutOfHelpers<'tcx>,

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

Computes the layout of a type. Note that this implicitly executes in “reveal all” mode, and will normalize the input type.
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fn spanned_layout_of(&self, ty: Ty<'tcx>, span: Span) -> Self::LayoutOfResult

Computes the layout of a type, at span. Note that this implicitly executes in “reveal all” mode, and will normalize the input type.
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impl<T> MaybeResult<T> for T

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type Error = !

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fn from(_: Result<T, <T as MaybeResult<T>>::Error>) -> T

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fn to_result(self) -> Result<T, <T as MaybeResult<T>>::Error>

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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> PointerArithmetic for T
where T: HasDataLayout,

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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<I, T, U> Upcast<I, U> for T
where U: UpcastFrom<I, T>,

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fn upcast(self, interner: I) -> U

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impl<I, T> UpcastFrom<I, T> for T

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fn upcast_from(from: T, _tcx: I) -> T

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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<Tcx, T> Value<Tcx> for T
where Tcx: DepContext,

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default fn from_cycle_error( tcx: Tcx, cycle_error: &CycleError, _guar: ErrorGuaranteed, ) -> T

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<'a, T> Captures<'a> for T
where T: ?Sized,

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impl<'a, T> Captures<'a> for T
where T: ?Sized,

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impl<T> ErasedDestructor for T
where T: 'static,

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: 400 bytes