Enum rustc_middle::mir::syntax::CastKind

pub enum CastKind {
    PointerExposeProvenance,
    PointerWithExposedProvenance,
    PointerCoercion(PointerCoercion),
    DynStar,
    IntToInt,
    FloatToInt,
    FloatToFloat,
    IntToFloat,
    PtrToPtr,
    FnPtrToPtr,
    Transmute,
}

Variants

PointerExposeProvenance

An exposing pointer to address cast. A cast between a pointer and an integer type, or between a function pointer and an integer type. See the docs on expose_provenance for more details.

PointerWithExposedProvenance

An address-to-pointer cast that picks up an exposed provenance. See the docs on with_exposed_provenance for more details.

PointerCoercion(PointerCoercion)

Pointer related casts that are done by coercions. Note that reference-to-raw-ptr casts are translated into &raw mut/const *r, i.e., they are not actually casts.

The following are allowed in AnalysisPhase::Initial as they’re needed for borrowck, but after that are forbidden (including in all phases of runtime MIR):

• PointerCoercion::ArrayToPointer
• PointerCoercion::MutToConstPointer

Both are runtime nops, so should be CastKind::PtrToPtr instead in runtime MIR.

DynStar

Cast into a dyn* object.

IntToInt

FloatToInt

FloatToFloat

IntToFloat

PtrToPtr

FnPtrToPtr

Transmute

Reinterpret the bits of the input as a different type.

MIR is well-formed if the input and output types have different sizes, but running a transmute between differently-sized types is UB.

Allowed only in MirPhase::Runtime; Earlier it’s a TerminatorKind::Call.

Trait Implementations

impl Clone for CastKind

fn clone(&self) -> CastKind

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for CastKind

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

Formats the value using the given formatter.

impl<__D: TyDecoder> Decodable<__D> for CastKind

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

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

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

impl Hash for CastKind

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 CastKind

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

impl PartialEq for CastKind

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for CastKind

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).

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.

impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for CastKind

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).

impl Copy for CastKind

impl Eq for CastKind

impl StructuralPartialEq for CastKind

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: 1 byte

Size for each variant:

• PointerExposeProvenance: 0 bytes
• PointerWithExposedProvenance: 0 bytes
• PointerCoercion: 1 byte
• DynStar: 0 bytes
• IntToInt: 0 bytes
• FloatToInt: 0 bytes
• FloatToFloat: 0 bytes
• IntToFloat: 0 bytes
• PtrToPtr: 0 bytes
• FnPtrToPtr: 0 bytes
• Transmute: 0 bytes