proto-from-ctor-realm.html

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- /wasm/jsapi/proto-from-ctor-realm.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>WebAssembly JS API: Default [[Prototype]] value is from NewTarget's Realm</title>

<link rel="help" href="https://webidl.spec.whatwg.org/#internally-create-a-new-object-implementing-the-interface">

<link rel="help" href="https://tc39.es/ecma262/#sec-nativeerror">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="wasm-module-builder.js"></script>

<body>

<iframe id="constructor-iframe" hidden></iframe>

<iframe id="new-target-iframe" hidden></iframe>

<iframe id="other-iframe" hidden></iframe>

<script>

"use strict";

const constructorRealm = document.querySelector("#constructor-iframe").contentWindow;

const newTargetRealm = document.querySelector("#new-target-iframe").contentWindow;

const otherRealm = document.querySelector("#other-iframe").contentWindow;

const emptyModuleBinary = new WasmModuleBuilder().toBuffer();

const interfaces = [

  ["Module", emptyModuleBinary],

  ["Instance", new WebAssembly.Module(emptyModuleBinary)],

  ["Memory", {initial: 0}],

  ["Table", {element: "anyfunc", initial: 0}],

  ["Global", {value: "i32"}],

  // See step 2 of https://tc39.es/ecma262/#sec-nativeerror

  ["CompileError"],

  ["LinkError"],

  ["RuntimeError"],

];

const primitives = [

  undefined,

  null,

  false,

  true,

0,

-1,

"",

  "str",

  Symbol(),

];

const getNewTargets = function* (realm) {

  for (const primitive of primitives) {

    const newTarget = new realm.Function();

    newTarget.prototype = primitive;

    yield [newTarget, "cross-realm NewTarget with `" + format_value(primitive) + "` prototype"];

  // GetFunctionRealm (https://tc39.es/ecma262/#sec-getfunctionrealm) coverage:

  const bindOther = otherRealm.Function.prototype.bind;

  const ProxyOther = otherRealm.Proxy;

  const bound = new realm.Function();

  bound.prototype = undefined;

  yield [bindOther.call(bound), "bound cross-realm NewTarget with `undefined` prototype"];

  const boundBound = new realm.Function();

  boundBound.prototype = null;

  yield [bindOther.call(bindOther.call(boundBound)), "bound bound cross-realm NewTarget with `null` prototype"];

  const boundProxy = new realm.Function();

  boundProxy.prototype = false;

  yield [bindOther.call(new ProxyOther(boundProxy, {})), "bound Proxy of cross-realm NewTarget with `false` prototype"];

  const proxy = new realm.Function();

  proxy.prototype = true;

  yield [new ProxyOther(proxy, {}), "Proxy of cross-realm NewTarget with `true` prototype"];

  const proxyProxy = new realm.Function();

  proxyProxy.prototype = -0;

  yield [new ProxyOther(new ProxyOther(proxyProxy, {}), {}), "Proxy of Proxy of cross-realm NewTarget with `-0` prototype"];

  const proxyBound = new realm.Function();

  proxyBound.prototype = NaN;

  yield [new ProxyOther(bindOther.call(proxyBound), {}), "Proxy of bound cross-realm NewTarget with `NaN` prototype"];

};

for (const [interfaceName, constructorArg] of interfaces) {

  for (const [newTarget, testDescription] of getNewTargets(newTargetRealm)) {

    test(() => {

      const Constructor = constructorRealm.WebAssembly[interfaceName];

      const object = Reflect.construct(Constructor, [constructorArg], newTarget);

      const NewTargetConstructor = newTargetRealm.WebAssembly[interfaceName];

      assert_true(object instanceof NewTargetConstructor);

      assert_equals(Object.getPrototypeOf(object), NewTargetConstructor.prototype);

    }, `WebAssembly.${interfaceName}: ${testDescription}`);

</script>

</body>