arguments-caller-callee.js

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/*

 * Any copyright is dedicated to the Public Domain.

 * http://creativecommons.org/licenses/publicdomain/

*/

var gTestfile = 'arguments-caller-callee.js';

var BUGNUMBER = 514563;

var summary = "arguments.caller and arguments.callee are poison pills in ES5, " +

              "later changed in ES2017 to only poison pill arguments.callee.";

print(BUGNUMBER + ": " + summary);

/**************

 * BEGIN TEST *

 **************/

// behavior

function expectTypeError(fun)

try

    fun();

    throw new Error("didn't throw");

  catch (e)

    assertEq(e instanceof TypeError, true,

             "expected TypeError calling function" +

             ("name" in fun ? " " + fun.name : "") + ", instead got: " + e);

function bar() { "use strict"; return arguments; }

assertEq(bar().caller, undefined); // No error when accessing arguments.caller in ES2017+

expectTypeError(function barCallee() { bar().callee; });

function baz() { return arguments; }

assertEq(baz().callee, baz);

// accessor identity

function strictMode() { "use strict"; return arguments; }

var canonicalTTE = Object.getOwnPropertyDescriptor(strictMode(), "callee").get;

var args = strictMode();

var argsCaller = Object.getOwnPropertyDescriptor(args, "caller");

assertEq(argsCaller, undefined);

var argsCallee = Object.getOwnPropertyDescriptor(args, "callee");

assertEq("get" in argsCallee, true);

assertEq("set" in argsCallee, true);

assertEq(argsCallee.get, canonicalTTE);

assertEq(argsCallee.set, canonicalTTE);

/******************************************************************************/

if (typeof reportCompare === "function")

  reportCompare(true, true);

print("All tests passed!");