Trait wiggle::GuestType

pub trait GuestType<'a>: Sized {
    fn guest_size() -> u32;
    fn guest_align() -> usize;
    fn read(ptr: &GuestPtr<'a, Self>) -> Result<Self, GuestError>;
    fn write(ptr: &GuestPtr<'_, Self>, val: Self) -> Result<(), GuestError>;
}

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

fn guest_size() -> u32

Returns the size, in bytes, of this type in the guest memory.

fn guest_align() -> usize

Returns the required alignment of this type, in bytes, for both guest and host memory.

fn read(ptr: &GuestPtr<'a, 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.

fn write(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.

Implementations on Foreign Types

impl<'a> GuestType<'a> for i8

fn guest_size() -> u32

fn guest_align() -> usize

fn read(ptr: &GuestPtr<'a, Self>) -> Result<Self, GuestError>

fn write(ptr: &GuestPtr<'_, Self>, val: Self) -> Result<(), GuestError>

impl<'a> GuestType<'a> for i16

fn guest_size() -> u32

fn guest_align() -> usize

fn read(ptr: &GuestPtr<'a, Self>) -> Result<Self, GuestError>

fn write(ptr: &GuestPtr<'_, Self>, val: Self) -> Result<(), GuestError>

impl<'a> GuestType<'a> for i32

fn guest_size() -> u32

fn guest_align() -> usize

fn read(ptr: &GuestPtr<'a, Self>) -> Result<Self, GuestError>

fn write(ptr: &GuestPtr<'_, Self>, val: Self) -> Result<(), GuestError>

impl<'a> GuestType<'a> for i64

fn guest_size() -> u32

fn guest_align() -> usize

fn read(ptr: &GuestPtr<'a, Self>) -> Result<Self, GuestError>

fn write(ptr: &GuestPtr<'_, Self>, val: Self) -> Result<(), GuestError>

impl<'a> GuestType<'a> for i128

fn guest_size() -> u32

fn guest_align() -> usize

fn read(ptr: &GuestPtr<'a, Self>) -> Result<Self, GuestError>

fn write(ptr: &GuestPtr<'_, Self>, val: Self) -> Result<(), GuestError>

impl<'a> GuestType<'a> for u8

fn guest_size() -> u32

fn guest_align() -> usize

fn read(ptr: &GuestPtr<'a, Self>) -> Result<Self, GuestError>

fn write(ptr: &GuestPtr<'_, Self>, val: Self) -> Result<(), GuestError>

impl<'a> GuestType<'a> for u16

fn guest_size() -> u32

fn guest_align() -> usize

fn read(ptr: &GuestPtr<'a, Self>) -> Result<Self, GuestError>

fn write(ptr: &GuestPtr<'_, Self>, val: Self) -> Result<(), GuestError>

impl<'a> GuestType<'a> for u32

fn guest_size() -> u32

fn guest_align() -> usize

fn read(ptr: &GuestPtr<'a, Self>) -> Result<Self, GuestError>

fn write(ptr: &GuestPtr<'_, Self>, val: Self) -> Result<(), GuestError>

impl<'a> GuestType<'a> for u64

fn guest_size() -> u32

fn guest_align() -> usize

fn read(ptr: &GuestPtr<'a, Self>) -> Result<Self, GuestError>

fn write(ptr: &GuestPtr<'_, Self>, val: Self) -> Result<(), GuestError>

impl<'a> GuestType<'a> for u128

fn guest_size() -> u32

fn guest_align() -> usize

fn read(ptr: &GuestPtr<'a, Self>) -> Result<Self, GuestError>

fn write(ptr: &GuestPtr<'_, Self>, val: Self) -> Result<(), GuestError>

impl<'a> GuestType<'a> for f32

fn guest_size() -> u32

fn guest_align() -> usize

fn read(ptr: &GuestPtr<'a, Self>) -> Result<Self, GuestError>

fn write(ptr: &GuestPtr<'_, Self>, val: Self) -> Result<(), GuestError>

impl<'a> GuestType<'a> for f64

fn guest_size() -> u32

fn guest_align() -> usize

fn read(ptr: &GuestPtr<'a, Self>) -> Result<Self, GuestError>

fn write(ptr: &GuestPtr<'_, Self>, val: Self) -> Result<(), GuestError>

Implementors

impl<'a, T> GuestType<'a> for GuestPtr<'a, [T]> where
    T: GuestType<'a>, 

fn guest_size() -> u32

fn guest_align() -> usize

fn read(ptr: &GuestPtr<'a, Self>) -> Result<Self, GuestError>

fn write(ptr: &GuestPtr<'_, Self>, val: Self) -> Result<(), GuestError>

impl<'a, T> GuestType<'a> for GuestPtr<'a, T>

fn guest_size() -> u32

fn guest_align() -> usize

fn read(ptr: &GuestPtr<'a, Self>) -> Result<Self, GuestError>

fn write(ptr: &GuestPtr<'_, Self>, val: Self) -> Result<(), GuestError>