proxy.js - mozsearch

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// |jit-test| skip-if: !wasmJSPromiseIntegrationEnabled()

// Test WebAssembly.Suspending with callable proxies.

// Basic callable proxy as suspending function.

  var target = async (x) => x + 1;

  var calls = 0;

  var handler = {

    apply(target, thisArg, args) {

      calls++;

      return target.apply(thisArg, args);

};

  var suspending = new WebAssembly.Suspending(new Proxy(target, handler));

  var ins = wasmEvalText(`(module

    (import "" "s" (func $s (param i32) (result i32)))

    (func (export "f") (param i32) (result i32) (call $s (local.get 0)))

  )`, {"": {s: suspending}});

  var p = WebAssembly.promising(ins.exports.f);

  p(41).then(r => {

    assertEq(r, 42);

    assertEq(calls, 1);

});

// Proxy that throws in apply trap.

  var target = async () => 0;

  var handler = {

    apply() { throw new Error("proxy trap error"); }

};

  var suspending = new WebAssembly.Suspending(new Proxy(target, handler));

  var ins = wasmEvalText(`(module

    (import "" "s" (func $s (result i32)))

    (func (export "f") (result i32) call $s)

  )`, {"": {s: suspending}});

  var p = WebAssembly.promising(ins.exports.f);

  p().then(

    () => assertEq(true, false),

    e => {

      assertEq(e instanceof Error, true);

      assertEq(e.message, "proxy trap error");

);

// Proxy returning a thenable.

  var target = () => ({ then(resolve) { resolve(123); } });

  var suspending = new WebAssembly.Suspending(new Proxy(target, {}));

  var ins = wasmEvalText(`(module

    (import "" "s" (func $s (result i32)))

    (func (export "f") (result i32) call $s)

  )`, {"": {s: suspending}});

  var p = WebAssembly.promising(ins.exports.f);

  p().then(r => assertEq(r, 123));

drainJobQueue();