Struct Instance 

pub struct Instance {
    pub module: Arc<ModuleInner>,
    pub exports: Exports,
    /* private fields */
}

An instantiated WebAssembly module.

An Instance represents a WebAssembly module that has been instantiated with an ImportObject and is ready to be called.

Fields

module: Arc<ModuleInner>

Reference to the module used to instantiate this instance.

exports: Exports

The exports of this instance.

Implementations

impl Instance

pub fn load<T>( &self, loader: T, ) -> Result<<T as Loader>::Instance, <T as Loader>::Error>

where T: Loader,

Load an Instance using the given loader.

pub fn func<Args, Rets>( &self, name: &str, ) -> Result<Func<'_, Args, Rets>, ResolveError>

where Args: WasmTypeList, Rets: WasmTypeList,

👎Deprecated since 0.17.0: Please use instance.exports.get(name) instead

Through generic magic and the awe-inspiring power of traits, we bring you…

“Func”

A Func allows you to call functions exported from wasm with near zero overhead.

Usage:

let func: Func<(i32, i32)> = instance.func("foo")?;

func.call(42, 43);

pub fn resolve_func(&self, name: &str) -> Result<usize, ResolveError>

Resolve a function by name.

pub fn dyn_func(&self, name: &str) -> Result<DynFunc<'_>, ResolveError>

👎Deprecated since 0.17.0: Please use instance.exports.get(name) instead

This returns the representation of a function that can be called safely.

Usage:

instance
    .dyn_func("foo")?
    .call(&[])?;

pub fn call( &self, name: &str, params: &[Value], ) -> Result<Vec<Value>, CallError>

Call an exported WebAssembly function given the export name. Pass arguments by wrapping each one in the Value enum. The returned values are also each wrapped in a Value.

Note:

This returns CallResult<Vec<Value>> in order to support the future multi-value returns WebAssembly feature.

Consider using the more explicit Exports::get with [DynFunc::call`] instead. For example:

// ...
let foo: DynFunc = instance.exports.get("foo")?;
let results = foo.call(&[Value::I32(42)])?;
// ...

Usage:

// ...
let results = instance.call("foo", &[Value::I32(42)])?;
// ...

pub fn context(&self) -> &Ctx

Returns an immutable reference to the Ctx used by this Instance.

pub fn context_mut(&mut self) -> &mut Ctx

Returns a mutable reference to the Ctx used by this Instance.

pub fn exports(&self) -> ExportIter<'_>

Returns an iterator over all of the items exported from this instance.

pub fn module(&self) -> Module

The module used to instantiate this Instance.

pub fn get_internal(&self, field: &InternalField) -> u64

Get the value of an internal field

pub fn set_internal(&mut self, field: &InternalField, value: u64)

Set the value of an internal field.

Trait Implementations

impl LikeNamespace for Instance

fn get_export(&self, name: &str) -> Option<Export>

Gets an export by name.

fn get_exports(&self) -> Vec<(String, Export)>

Gets all exports in the namespace.

fn maybe_insert(&mut self, _name: &str, _export: Export) -> Option<()>

Maybe insert an Export by name into the namespace.