pub enum CastKind {
PointerExposeProvenance,
PointerWithExposedProvenance,
PointerCoercion(PointerCoercion, CoercionSource),
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, CoercionSource)
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):
Both are runtime nops, so should be CastKind::PtrToPtr
instead in runtime MIR.
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§
Source§impl<'__ctx> HashStable<StableHashingContext<'__ctx>> for CastKind
impl<'__ctx> HashStable<StableHashingContext<'__ctx>> for CastKind
fn hash_stable( &self, __hcx: &mut StableHashingContext<'__ctx>, __hasher: &mut StableHasher, )
Source§impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for CastKind
impl<'tcx> TypeFoldable<TyCtxt<'tcx>> for CastKind
Source§fn try_fold_with<F: FallibleTypeFolder<TyCtxt<'tcx>>>(
self,
_: &mut F,
) -> Result<Self, F::Error>
fn try_fold_with<F: FallibleTypeFolder<TyCtxt<'tcx>>>( self, _: &mut F, ) -> Result<Self, F::Error>
Source§impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for CastKind
impl<'tcx> TypeVisitable<TyCtxt<'tcx>> for CastKind
Source§fn visit_with<F: TypeVisitor<TyCtxt<'tcx>>>(&self, _: &mut F) -> F::Result
fn visit_with<F: TypeVisitor<TyCtxt<'tcx>>>(&self, _: &mut F) -> F::Result
impl Copy for CastKind
impl Eq for CastKind
impl StructuralPartialEq for CastKind
Auto Trait Implementations§
impl DynSend for CastKind
impl DynSync for CastKind
impl Freeze for CastKind
impl RefUnwindSafe for CastKind
impl Send for CastKind
impl Sync for CastKind
impl Unpin for CastKind
impl UnwindSafe for CastKind
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fn allocate_from_iter( arena: &'tcx Arena<'tcx>, iter: impl IntoIterator<Item = T>, ) -> &'tcx mut [T]
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Layout§
Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...)
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Size: 2 bytes
Size for each variant:
PointerExposeProvenance
: 0 bytesPointerWithExposedProvenance
: 0 bytesPointerCoercion
: 2 bytesIntToInt
: 0 bytesFloatToInt
: 0 bytesFloatToFloat
: 0 bytesIntToFloat
: 0 bytesPtrToPtr
: 0 bytesFnPtrToPtr
: 0 bytesTransmute
: 0 bytes