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

Trait Implementations

Returns a copy of the value. Read more
Performs copy-assignment from source. Read more
Formats the value using the given formatter. Read more
Converts to this type from the input type.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning. Read more
Uses borrowed data to replace owned data, usually by cloning. Read more
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.

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.