Enum rustc_const_eval::interpret::Immediate
source · pub enum Immediate<Prov: Provenance = AllocId> {
Scalar(Scalar<Prov>),
ScalarPair(Scalar<Prov>, Scalar<Prov>),
Uninit,
}
Expand description
An Immediate
represents a single immediate self-contained Rust value.
For optimization of a few very common cases, there is also a representation for a pair of
primitive values (ScalarPair
). It allows Miri to avoid making allocations for checked binary
operations and wide pointers. This idea was taken from rustc’s codegen.
In particular, thanks to ScalarPair
, arithmetic operations and casts can be entirely
defined on Immediate
, and do not have to work with a Place
.
Variants
Scalar(Scalar<Prov>)
A single scalar value (must have initialized Scalar
ABI).
ScalarPair(Scalar<Prov>, Scalar<Prov>)
A pair of two scalar value (must have ScalarPair
ABI where both fields are
Scalar::Initialized
).
Uninit
A value of fully uninitialized memory. Can have and size and layout.
Implementations
sourceimpl<Prov: Provenance> Immediate<Prov>
impl<Prov: Provenance> Immediate<Prov>
pub fn from_pointer(p: Pointer<Prov>, cx: &impl HasDataLayout) -> Self
pub fn from_maybe_pointer(
p: Pointer<Option<Prov>>,
cx: &impl HasDataLayout
) -> Self
pub fn new_slice(val: Scalar<Prov>, len: u64, cx: &impl HasDataLayout) -> Self
pub fn new_dyn_trait(
val: Scalar<Prov>,
vtable: Pointer<Option<Prov>>,
cx: &impl HasDataLayout
) -> Self
pub fn to_scalar(self) -> Scalar<Prov>
pub fn to_scalar_pair(self) -> (Scalar<Prov>, Scalar<Prov>)
Trait Implementations
sourceimpl<Prov: Clone + Provenance> Clone for Immediate<Prov>
impl<Prov: Clone + Provenance> Clone for Immediate<Prov>
sourceimpl<Prov: Debug + Provenance> Debug for Immediate<Prov>
impl<Prov: Debug + Provenance> Debug for Immediate<Prov>
sourceimpl<Prov: Provenance> From<Scalar<Prov>> for Immediate<Prov>
impl<Prov: Provenance> From<Scalar<Prov>> for Immediate<Prov>
impl<Prov: Copy + Provenance> Copy for Immediate<Prov>
Auto Trait Implementations
impl<Prov> RefUnwindSafe for Immediate<Prov>where
Prov: RefUnwindSafe,
impl<Prov> Send for Immediate<Prov>where
Prov: Send,
impl<Prov> Sync for Immediate<Prov>where
Prov: Sync,
impl<Prov> Unpin for Immediate<Prov>where
Prov: Unpin,
impl<Prov> UnwindSafe for Immediate<Prov>where
Prov: UnwindSafe,
Blanket Implementations
sourceimpl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Layout
Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.