Enum HostCall

pub enum HostCall {
    ArrayCall,
    Builtin(BuiltinFunctionIndex),
    ComponentLowerImport,
    ComponentBuiltin(ComponentBuiltinFunctionIndex),
}

Enumeration of all possible ways that wasm may execute code in the host.

This type is intended to be serialized into a 32-bit index (or smaller) and is used by Pulley for example to identify how transitions from the guest to the host are performed.

Variants

ArrayCall

An “array call” is being done which means that the wasm is calling the host using the array calling convention (e.g. VMArrayCallNative).

Builtin(BuiltinFunctionIndex)

A builtin function, e.g. for memory.grow, is being called. Each builtin has its own ABI.

ComponentLowerImport

A lowered component function is being called. This is done by a trampoline generated by Cranelift and is distinct from the array calling convention.

This correspond to VMLoweringCallee.

ComponentBuiltin(ComponentBuiltinFunctionIndex)

A builtin function, but specifically for components. For example string transcoders.

Implementations

impl HostCall

pub const fn index(&self) -> u32

Returns a 32-bit index for this hostcall.

pub fn from_index(index: u32) -> Self

Create a HostCall from the result of an earlier call to HostCall::index.

Trait Implementations

impl Clone for HostCall

fn clone(&self) -> HostCall

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for HostCall

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<BuiltinFunctionIndex> for HostCall

fn from(idx: BuiltinFunctionIndex) -> HostCall

Converts to this type from the input type.

impl From<ComponentBuiltinFunctionIndex> for HostCall

fn from(idx: ComponentBuiltinFunctionIndex) -> HostCall

Converts to this type from the input type.

impl Hash for HostCall

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for HostCall

fn cmp(&self, other: &HostCall) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for HostCall

fn eq(&self, other: &HostCall) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for HostCall

fn partial_cmp(&self, other: &HostCall) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for HostCall

impl Eq for HostCall

impl StructuralPartialEq for HostCall