Struct rustc_mir_transform::promote_consts::Validator

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struct Validator<'a, 'tcx> {
    ccx: &'a ConstCx<'a, 'tcx>,
    temps: &'a mut IndexSlice<Local, TempState>,
    promotion_safe_blocks: Option<FxHashSet<BasicBlock>>,
}
Expand description

Checks whether locals that appear in a promotion context (Candidate) are actually promotable.

This wraps an Item, and has access to all fields of that Item via Deref coercion.

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§ccx: &'a ConstCx<'a, 'tcx>§temps: &'a mut IndexSlice<Local, TempState>§promotion_safe_blocks: Option<FxHashSet<BasicBlock>>

For backwards compatibility, we are promoting function calls in const/static initializers. But we want to avoid evaluating code that might panic and that otherwise would not have been evaluated, so we only promote such calls in basic blocks that are guaranteed to execute. In other words, we only promote such calls in basic blocks that are definitely not dead code. Here we cache the result of computing that set of basic blocks.

Implementations§

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impl<'tcx> Validator<'_, 'tcx>

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fn validate_candidate( &mut self, candidate: Candidate, ) -> Result<(), Unpromotable>

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fn qualif_local<Q: Qualif>(&mut self, local: Local) -> bool

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fn validate_local(&mut self, local: Local) -> Result<(), Unpromotable>

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fn validate_place(&mut self, place: PlaceRef<'tcx>) -> Result<(), Unpromotable>

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fn validate_operand( &mut self, operand: &Operand<'tcx>, ) -> Result<(), Unpromotable>

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fn validate_ref( &mut self, kind: BorrowKind, place: &Place<'tcx>, ) -> Result<(), Unpromotable>

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fn validate_rvalue(&mut self, rvalue: &Rvalue<'tcx>) -> Result<(), Unpromotable>

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fn promotion_safe_blocks(body: &Body<'tcx>) -> FxHashSet<BasicBlock>

Computes the sets of blocks of this MIR that are definitely going to be executed if the function returns successfully. That makes it safe to promote calls in them that might fail.

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fn is_promotion_safe_block(&mut self, block: BasicBlock) -> bool

Returns whether the block is “safe” for promotion, which means it cannot be dead code. We use this to avoid promoting operations that can fail in dead code.

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fn validate_call( &mut self, callee: &Operand<'tcx>, args: &[Spanned<Operand<'tcx>>], block: BasicBlock, ) -> Result<(), Unpromotable>

Methods from Deref<Target = ConstCx<'a, 'tcx>>§

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pub fn def_id(&self) -> LocalDefId

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pub fn const_kind(&self) -> ConstContext

Returns the kind of const context this Item represents (const, static, etc.).

Panics if this Item is not const.

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pub fn is_const_stable_const_fn(&self) -> bool

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pub fn fn_sig(&self) -> Binder<TyCtxt<'tcx>, FnSig<TyCtxt<'tcx>>>

Trait Implementations§

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impl<'a, 'tcx> Deref for Validator<'a, 'tcx>

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type Target = ConstCx<'a, 'tcx>

The resulting type after dereferencing.
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fn deref(&self) -> &Self::Target

Dereferences the value.

Auto Trait Implementations§

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impl<'a, 'tcx> Freeze for Validator<'a, 'tcx>

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impl<'a, 'tcx> !RefUnwindSafe for Validator<'a, 'tcx>

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impl<'a, 'tcx> !Send for Validator<'a, 'tcx>

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impl<'a, 'tcx> !Sync for Validator<'a, 'tcx>

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impl<'a, 'tcx> Unpin for Validator<'a, 'tcx>

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impl<'a, 'tcx> !UnwindSafe for Validator<'a, '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<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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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
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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: 56 bytes