rustc_middle::mir::syntax

Struct SwitchTargets

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pub struct SwitchTargets {
    pub(super) values: SmallVec<[Pu128; 1]>,
    pub(super) targets: SmallVec<[BasicBlock; 2]>,
}

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§values: SmallVec<[Pu128; 1]>

Possible values. The locations to branch to in each case are found in the corresponding indices from the targets vector.

§targets: SmallVec<[BasicBlock; 2]>

Possible branch sites. The last element of this vector is used for the otherwise branch, so targets.len() == values.len() + 1 should hold.

Implementations§

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impl SwitchTargets

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pub fn successors_for_value(&self, value: u128) -> Successors<'_>

Like SwitchTargets::target_for_value, but returning the same type as Terminator::successors.

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impl SwitchTargets

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pub fn new( targets: impl Iterator<Item = (u128, BasicBlock)>, otherwise: BasicBlock, ) -> Self

Creates switch targets from an iterator of values and target blocks.

The iterator may be empty, in which case the SwitchInt instruction is equivalent to goto otherwise;.

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pub fn static_if(value: u128, then: BasicBlock, else_: BasicBlock) -> Self

Builds a switch targets definition that jumps to then if the tested value equals value, and to else_ if not.

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pub fn as_static_if(&self) -> Option<(u128, BasicBlock, BasicBlock)>

Inverse of SwitchTargets::static_if.

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pub fn otherwise(&self) -> BasicBlock

Returns the fallback target that is jumped to when none of the values match the operand.

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pub fn iter(&self) -> SwitchTargetsIter<'_>

Returns an iterator over the switch targets.

The iterator will yield tuples containing the value and corresponding target to jump to, not including the otherwise fallback target.

Note that this may yield 0 elements. Only the otherwise branch is mandatory.

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pub fn all_targets(&self) -> &[BasicBlock]

Returns a slice with all possible jump targets (including the fallback target).

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pub fn all_targets_mut(&mut self) -> &mut [BasicBlock]

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pub fn target_for_value(&self, value: u128) -> BasicBlock

Finds the BasicBlock to which this SwitchInt will branch given the specific value. This cannot fail, as it’ll return the otherwise branch if there’s not a specific match for the value.

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pub fn add_target(&mut self, value: u128, bb: BasicBlock)

Adds a new target to the switch. But You cannot add an already present value.

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pub fn is_distinct(&self) -> bool

Returns true if all targets (including the fallback target) are distinct.

Trait Implementations§

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impl Clone for SwitchTargets

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fn clone(&self) -> SwitchTargets

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for SwitchTargets

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<__D: TyDecoder> Decodable<__D> for SwitchTargets

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fn decode(__decoder: &mut __D) -> Self

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impl<__E: TyEncoder> Encodable<__E> for SwitchTargets

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fn encode(&self, __encoder: &mut __E)

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impl Hash for SwitchTargets

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl<'__ctx> HashStable<StableHashingContext<'__ctx>> for SwitchTargets

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fn hash_stable( &self, __hcx: &mut StableHashingContext<'__ctx>, __hasher: &mut StableHasher, )

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impl PartialEq for SwitchTargets

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fn eq(&self, other: &SwitchTargets) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for SwitchTargets

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fn try_fold_with<F: FallibleTypeFolder<TyCtxt<'tcx>>>( self, _: &mut F, ) -> Result<Self, F::Error>

The entry point for folding. To fold a value t with a folder f call: t.try_fold_with(f). Read more
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fn fold_with<F: TypeFolder<TyCtxt<'tcx>>>(self, _: &mut F) -> Self

A convenient alternative to try_fold_with for use with infallible folders. Do not override this method, to ensure coherence with try_fold_with.
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impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for SwitchTargets

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fn visit_with<F: TypeVisitor<TyCtxt<'tcx>>>(&self, _: &mut F) -> F::Result

The entry point for visiting. To visit a value t with a visitor v call: t.visit_with(v). Read more
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impl StructuralPartialEq for SwitchTargets

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const ALIGN: Alignment = _

Alignment of Self.
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🔬This is a nightly-only experimental API. (clone_to_uninit)
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This method turns the parameters of a DepNodeConstructor into an opaque Fingerprint to be used in DepNode. Not all DepNodeParams support being turned into a Fingerprint (they don’t need to if the corresponding DepNode is anonymous).
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True if there are any un-erased free regions.
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Size: 48 bytes