struct TransferFunction<'a, 'mir, 'tcx, Q> {
    ccx: &'a ConstCx<'mir, 'tcx>,
    state: &'a mut State,
    _qualif: PhantomData<Q>,
}
Expand description

A Visitor that propagates qualifs between locals. This defines the transfer function of FlowSensitiveAnalysis.

To account for indirect assignments, data flow conservatively assumes that local becomes qualified immediately after it is borrowed or its address escapes. The borrow must allow for mutation, which includes shared borrows of places with interior mutability. The type of borrowed place must contain the qualif.

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§ccx: &'a ConstCx<'mir, 'tcx>§state: &'a mut State§_qualif: PhantomData<Q>

Implementations§

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impl<'a, 'mir, 'tcx, Q> TransferFunction<'a, 'mir, 'tcx, Q>
where Q: Qualif,

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fn new(ccx: &'a ConstCx<'mir, 'tcx>, state: &'a mut State) -> Self

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fn initialize_state(&mut self)

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fn assign_qualif_direct(&mut self, place: &Place<'tcx>, value: bool)

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fn apply_call_return_effect( &mut self, _block: BasicBlock, return_places: CallReturnPlaces<'_, 'tcx>, )

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fn address_of_allows_mutation(&self) -> bool

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fn ref_allows_mutation(&self, kind: BorrowKind, place: Place<'tcx>) -> bool

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fn shared_borrow_allows_mutation(&self, place: Place<'tcx>) -> bool

& only allow mutation if the borrowed place is !Freeze.

This assumes that it is UB to take the address of a struct field whose type is Freeze, then use pointer arithmetic to derive a pointer to a different field of that same struct whose type is !Freeze. If we decide that this is not UB, we will have to check the type of the borrowed local instead of the borrowed place below. See rust-lang/unsafe-code-guidelines#134.

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impl<'tcx, Q> Visitor<'tcx> for TransferFunction<'_, '_, 'tcx, Q>
where Q: Qualif,

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

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

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

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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_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_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_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<'a, 'mir, 'tcx, Q> Freeze for TransferFunction<'a, 'mir, 'tcx, Q>

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impl<'a, 'mir, 'tcx, Q> !RefUnwindSafe for TransferFunction<'a, 'mir, 'tcx, Q>

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impl<'a, 'mir, 'tcx, Q> !Send for TransferFunction<'a, 'mir, 'tcx, Q>

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impl<'a, 'mir, 'tcx, Q> !Sync for TransferFunction<'a, 'mir, 'tcx, Q>

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impl<'a, 'mir, 'tcx, Q> Unpin for TransferFunction<'a, 'mir, 'tcx, Q>
where Q: Unpin,

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impl<'a, 'mir, 'tcx, Q> !UnwindSafe for TransferFunction<'a, 'mir, 'tcx, Q>

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

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impl<T> MaybeSendSync for T

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: 16 bytes