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 arbitrary size and layout, but must be sized.
Implementations§
source§impl<Prov: Provenance> Immediate<Prov>
impl<Prov: Provenance> Immediate<Prov>
pub fn from_pointer(ptr: Pointer<Prov>, cx: &impl HasDataLayout) -> Self
pub fn from_maybe_pointer( ptr: Pointer<Option<Prov>>, cx: &impl HasDataLayout ) -> Self
pub fn new_slice( ptr: Pointer<Option<Prov>>, len: u64, cx: &impl HasDataLayout ) -> Self
pub fn new_dyn_trait( val: Pointer<Option<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§
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§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere T: ?Sized,
source§fn 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.