01f5601129
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
82 lines
3.1 KiB
JavaScript
82 lines
3.1 KiB
JavaScript
// Copyright 2013 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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var desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
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assertEquals("function", typeof desc.get);
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assertEquals("function", typeof desc.set);
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assertDoesNotThrow("desc.get.call({})");
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assertDoesNotThrow("desc.set.call({}, {})");
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var obj = {};
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var obj2 = {};
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desc.set.call(obj, obj2);
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assertEquals(obj.__proto__, obj2);
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assertEquals(desc.get.call(obj), obj2);
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// Check that any redefinition of the __proto__ accessor works.
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Object.defineProperty(Object.prototype, "__proto__", {
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get: function() {
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return 42;
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}
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});
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assertEquals({}.__proto__, 42);
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assertEquals(desc.get.call({}), Object.prototype);
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var desc2 = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
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assertEquals(desc2.get.call({}), 42);
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assertDoesNotThrow("desc2.set.call({})");
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Object.defineProperty(Object.prototype, "__proto__", { set:function(x){} });
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var desc3 = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
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assertDoesNotThrow("desc3.get.call({})");
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assertDoesNotThrow("desc3.set.call({})");
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Object.defineProperty(Object.prototype, "__proto__", { set: undefined });
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assertThrows(function() {
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"use strict";
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var o = {};
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var p = {};
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o.__proto__ = p;
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}, TypeError);
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assertTrue(delete Object.prototype.__proto__);
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var o = {};
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var p = {};
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o.__proto__ = p;
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assertEquals(Object.getPrototypeOf(o), Object.prototype);
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var desc4 = Object.getOwnPropertyDescriptor(o, "__proto__");
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assertTrue(desc4.configurable);
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assertTrue(desc4.enumerable);
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assertTrue(desc4.writable);
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assertEquals(desc4.value, p);
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