proto-property-change-writability-set.js

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/*

 * Any copyright is dedicated to the Public Domain.

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

 * Contributors:

 *   Gary Kwong

 *   Jeff Walden

 *   Jason Orendorff

*/

//-----------------------------------------------------------------------------

var BUGNUMBER = 713944;

var summary =

  "Don't assert anything about a shape from the property cache until it's " +

  "known the cache entry matches";

print(BUGNUMBER + ": " + summary);

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

 * BEGIN TEST *

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

var accDesc = { set: function() {} };

var dataDesc = { value: 3 };

function f()

  propertyIsEnumerable = {};

function g()

  propertyIsEnumerable = {};

Object.defineProperty(Object.prototype, "propertyIsEnumerable", accDesc);

f();

Object.defineProperty(Object.prototype, "propertyIsEnumerable", dataDesc);

assertEq(propertyIsEnumerable, 3);

f();

assertEq(propertyIsEnumerable, 3);

g();

assertEq(propertyIsEnumerable, 3);

var a = { p1: 1, p2: 2 };

var b = Object.create(a);

Object.defineProperty(a, "p1", {set: function () {}});

for (var i = 0; i < 2; i++)

  b.p1 = {};

  Object.defineProperty(a, "p1", {value: 3});

assertEq(b.p1, 3);

assertEq(a.p1, 3);

reportCompare(true, true);