Enum miri::Immediate

source ·

pub enum Immediate<Prov = AllocId>where
    Prov: Provenance,{
    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§

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Scalar(Scalar<Prov>)

A single scalar value (must have initialized Scalar ABI).

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ScalarPair(Scalar<Prov>, Scalar<Prov>)

A pair of two scalar value (must have ScalarPair ABI where both fields are Scalar::Initialized).

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Uninit

A value of fully uninitialized memory. Can have arbitrary size and layout, but must be sized.

Enum miri::Immediate

Variants§

Scalar(Scalar<Prov>)

ScalarPair(Scalar<Prov>, Scalar<Prov>)

Uninit

Trait Implementations§

impl VisitTags for Immediate<Provenance>

fn visit_tags(&self, visit: &mut dyn FnMut(BorTag))

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§

impl<T> Any for Twhere T: 'static + ?Sized,

fn type_id(&self) -> TypeId

impl<T> Borrow<T> for Twhere T: ?Sized,

fn borrow(&self) -> &T

impl<T> BorrowMut<T> for Twhere T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

impl<T> From<T> for T

fn from(t: T) -> T

impl<T, U> Into<U> for Twhere U: From<T>,

fn into(self) -> U

impl<T> ToOwned for Twhere T: Clone,

type Owned = T

fn to_owned(&self) -> T

fn clone_into(&self, target: &mut T)

impl<T, U> TryFrom<U> for Twhere U: Into<T>,

type Error = Infallible

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

impl<V, T> VZip<V> for Twhere V: MultiLane<T>,

fn vzip(self) -> V

Layout§