Struct rustc_middle::mir::terminator::SwitchTargets

pub struct SwitchTargets {
    values: SmallVec<[u128; 1]>,
    targets: SmallVec<[BasicBlock; 2]>,
}

Fields

values: SmallVec<[u128; 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

impl SwitchTargets

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;.

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.

pub fn otherwise(&self) -> BasicBlock

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

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.

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

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

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

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.

Trait Implementations

impl Clone for SwitchTargets

fn clone(&self) -> SwitchTargets

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SwitchTargets

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

Formats the value using the given formatter.

impl<'tcx, __D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<__D> for SwitchTargets

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

impl<'tcx, __E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<__E> for SwitchTargets

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

impl Hash for SwitchTargets

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

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where
    H: Hasher,
    Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<'__ctx> HashStable<StableHashingContext<'__ctx>> for SwitchTargets

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

impl<'tcx> Lift<'tcx> for SwitchTargets

type Lifted = SwitchTargets

fn lift_to_tcx(self, _: TyCtxt<'tcx>) -> Option<Self>

impl PartialEq<SwitchTargets> for SwitchTargets

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

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'tcx> TypeFoldable<'tcx> for SwitchTargets

fn try_fold_with<F: FallibleTypeFolder<'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).

fn fold_with<F: TypeFolder<'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.

impl<'tcx> TypeVisitable<'tcx> for SwitchTargets

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

The entry point for visiting. To visit a value t with a visitor v call: t.visit_with(v).

fn has_vars_bound_at_or_above(&self, binder: DebruijnIndex) -> bool

Returns true if self has any late-bound regions that are either bound by binder or bound by some binder outside of binder. If binder is ty::INNERMOST, this indicates whether there are any late-bound regions that appear free.

fn has_vars_bound_above(&self, binder: DebruijnIndex) -> bool

Returns true if this type has any regions that escape binder (and hence are not bound by it).

fn has_escaping_bound_vars(&self) -> bool

Return true if this type has regions that are not a part of the type. For example, for<'a> fn(&'a i32) return false, while fn(&'a i32) would return true. The latter can occur when traversing through the former.

fn has_type_flags(&self, flags: TypeFlags) -> bool

fn has_projections(&self) -> bool

fn has_opaque_types(&self) -> bool

fn references_error(&self) -> bool

fn error_reported(&self) -> Result<(), ErrorGuaranteed>

fn has_non_region_param(&self) -> bool

fn has_infer_regions(&self) -> bool

fn has_infer_types(&self) -> bool

fn has_non_region_infer(&self) -> bool

fn needs_infer(&self) -> bool

fn has_placeholders(&self) -> bool

fn needs_subst(&self) -> bool

fn has_free_regions(&self) -> bool

“Free” regions in this context means that it has any region that is not (a) erased or (b) late-bound.

fn has_erased_regions(&self) -> bool

fn has_erasable_regions(&self) -> bool

True if there are any un-erased free regions.

fn is_global(&self) -> bool

Indicates whether this value references only ‘global’ generic parameters that are the same regardless of what fn we are in. This is used for caching.

fn has_late_bound_regions(&self) -> bool

True if there are any late-bound regions

fn still_further_specializable(&self) -> bool

Indicates whether this value still has parameters/placeholders/inference variables which could be replaced later, in a way that would change the results of impl specialization.

impl StructuralPartialEq for SwitchTargets

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: 48 bytes