cross-realm-spread-call.js

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// Test for `foo(...arguments)` spread calls with a cross-realm ArgumentsObject.

function testArgs(a, b, c) {

  return `${a} ${b} ${c}`;

function test() {

  var g = newGlobal();

  // Replace g.%ArrayIteratorPrototype%.next.

  g.evaluate(`

    let arrIterProto = Object.getPrototypeOf([][Symbol.iterator]());

    let count = 0;

    arrIterProto.next = function() {

      if (count > 2) {

        count = 0;

        return {done: true, value: 0};

      return {done: false, value:count++ * 5} };

`);

  for (var i = 0; i < 30; i++) {

    var myRealmArgs = () => (function() { return arguments; })(1, 2, 3);

    var crossRealmArgs = () => g.evaluate(`(function() { return arguments; })(1, 2, 3)`);

    assertEq(testArgs(...myRealmArgs()), "1 2 3");

    assertEq(testArgs(...crossRealmArgs()), "0 5 10");

    var mixed = (i & 1) ? myRealmArgs() : crossRealmArgs();

    assertEq(testArgs(...mixed), (i & 1) ? "1 2 3" : "0 5 10");

test();