v8/test/mjsunit/proto-accessor.js
rossberg@chromium.org 01f5601129 ES6: Remove __proto__ setter poison pill
http://people.mozilla.org/~jorendorff/es6-draft.html#sec-set-object.prototype.__proto__

The __proto__ setter should be reusable on other objects.

BUG=v8:2804
LOG=y
R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/103343005

Patch from Erik Arvidsson <arv@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19165 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2014-02-06 16:09:45 +00:00

82 lines
3.1 KiB
JavaScript

// Copyright 2013 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
var desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
assertEquals("function", typeof desc.get);
assertEquals("function", typeof desc.set);
assertDoesNotThrow("desc.get.call({})");
assertDoesNotThrow("desc.set.call({}, {})");
var obj = {};
var obj2 = {};
desc.set.call(obj, obj2);
assertEquals(obj.__proto__, obj2);
assertEquals(desc.get.call(obj), obj2);
// Check that any redefinition of the __proto__ accessor works.
Object.defineProperty(Object.prototype, "__proto__", {
get: function() {
return 42;
}
});
assertEquals({}.__proto__, 42);
assertEquals(desc.get.call({}), Object.prototype);
var desc2 = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
assertEquals(desc2.get.call({}), 42);
assertDoesNotThrow("desc2.set.call({})");
Object.defineProperty(Object.prototype, "__proto__", { set:function(x){} });
var desc3 = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
assertDoesNotThrow("desc3.get.call({})");
assertDoesNotThrow("desc3.set.call({})");
Object.defineProperty(Object.prototype, "__proto__", { set: undefined });
assertThrows(function() {
"use strict";
var o = {};
var p = {};
o.__proto__ = p;
}, TypeError);
assertTrue(delete Object.prototype.__proto__);
var o = {};
var p = {};
o.__proto__ = p;
assertEquals(Object.getPrototypeOf(o), Object.prototype);
var desc4 = Object.getOwnPropertyDescriptor(o, "__proto__");
assertTrue(desc4.configurable);
assertTrue(desc4.enumerable);
assertTrue(desc4.writable);
assertEquals(desc4.value, p);