wasm_runtime_layer 0.7.0

Compatibility interface for WASM runtimes.
Documentation 
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use std::collections::BTreeMap;

use wasm_runtime_layer::{
    backend::WasmEngine, Engine, Extern, Func, FuncType, Imports, Instance, Module, Store, Val,
    ValType,
};

#[test]
#[cfg(not(target_arch = "wasm32"))]
fn test_wasmtime() {
    // 1. Instantiate a runtime
    let engine = Engine::new(wasmtime_runtime_layer::Engine::default());
    multi_value(&engine)
}

#[test]
#[wasm_bindgen_test::wasm_bindgen_test]
fn test_wasmi() {
    // 1. Instantiate a runtime
    let engine = Engine::new(wasmi_runtime_layer::Engine::default());
    multi_value(&engine)
}

#[wasm_bindgen_test::wasm_bindgen_test]
#[cfg(target_arch = "wasm32")]
fn test_js_wasm() {
    // 1. Instantiate a runtime
    let engine = Engine::new(js_wasm_runtime_layer::Engine::default());
    multi_value(&engine)
}

#[test]
#[cfg(not(target_arch = "wasm32"))]
fn test_wasmer() {
    // 1. Instantiate a runtime
    let engine = Engine::new(wasmer_runtime_layer::Engine::default());
    multi_value(&engine)
}

#[allow(unused)]
fn multi_value(engine: &Engine<impl WasmEngine>) {
    let mut store = Store::new(engine, ());

    // 2. Create modules and instances, similar to other runtimes
    let module_bin = wat::parse_str(
        r#"
            (module
              (import "host" "get-values" (func $get-values (result i32) (result i32)))

              (func $add-sub (param $a i32) (param $b i32) (result i32) (result i32)
                  (local $c i32)
                  call $get-values
                  i32.sub

                  local.set $c

                  local.get $a
                  local.get $b
                  i32.add
                  local.get $c)

              (export "add-sub" (func $add-sub)))
            "#,
    )
    .unwrap();

    let func = Func::new(
        &mut store,
        FuncType::new([], [ValType::I32, ValType::I32]),
        |_, _, res| {
            res[0] = Val::I32(5);
            res[1] = Val::I32(4);
            Ok(())
        },
    );

    let mut imports = Imports::new();
    imports.define("host", "get-values", crate::Extern::Func(func));

    // Parse the component bytes and load its imports and exports.
    let module = Module::new(engine, &module_bin).unwrap();
    let instance = Instance::new(&mut store, &module, &imports).unwrap();

    let exports = instance
        .exports(&store)
        .map(|v| (v.name, v.value))
        .collect::<BTreeMap<_, _>>();

    // Get the function for selecting a list element.
    let Extern::Func(func) = exports.get("add-sub").unwrap() else {
        unreachable!()
    };

    let mut result = [Val::I32(0), Val::I32(0)];
    func.call(&mut store, &[Val::I32(5), Val::I32(7)], &mut result)
        .unwrap();

    assert_eq!(result, [Val::I32(12), Val::I32(1)]);
}