pub trait GuestType: Sized {
// Required methods
fn guest_size() -> u32;
fn guest_align() -> usize;
fn read(
mem: &GuestMemory<'_>,
ptr: GuestPtr<Self>,
) -> Result<Self, GuestError>;
fn write(
mem: &mut GuestMemory<'_>,
ptr: GuestPtr<Self>,
val: Self,
) -> Result<(), GuestError>;
}Expand description
A trait for types that are intended to be pointees in GuestPtr<T>.
This trait abstracts how to read/write information from the guest memory, as well as how to offset elements in an array of guest memory. This layer of abstraction allows the guest representation of a type to be different from the host representation of a type, if necessary. It also allows for validation when reading/writing.
Required Methods§
sourcefn guest_size() -> u32
fn guest_size() -> u32
Returns the size, in bytes, of this type in the guest memory.
sourcefn guest_align() -> usize
fn guest_align() -> usize
Returns the required alignment of this type, in bytes, for both guest and host memory.
sourcefn read(mem: &GuestMemory<'_>, ptr: GuestPtr<Self>) -> Result<Self, GuestError>
fn read(mem: &GuestMemory<'_>, ptr: GuestPtr<Self>) -> Result<Self, GuestError>
Reads this value from the provided ptr.
Must internally perform any safety checks necessary and is allowed to fail if the bytes pointed to are also invalid.
Typically if you’re implementing this by hand you’ll want to delegate to
other safe implementations of this trait (e.g. for primitive types like
u32) rather than writing lots of raw code yourself.
sourcefn write(
mem: &mut GuestMemory<'_>,
ptr: GuestPtr<Self>,
val: Self,
) -> Result<(), GuestError>
fn write( mem: &mut GuestMemory<'_>, ptr: GuestPtr<Self>, val: Self, ) -> Result<(), GuestError>
Writes a value to ptr after verifying that ptr is indeed valid to
store val.
Similar to read, you’ll probably want to implement this in terms of
other primitives.
Dyn Compatibility§
This trait is not dyn compatible.
In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.