9e757a604c
This turns the __proto__ callback from a foreign callback into a real JavaScript accessor. It makes the accessor behavior of this property explicit. R=rossberg@chromium.org BUG=v8:1949,v8:2606 TEST=mjsunit/regress/regress-2606 Review URL: https://codereview.chromium.org/13533004 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14139 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
62 lines
2.9 KiB
JavaScript
62 lines
2.9 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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// Check baseline for __proto__.
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var desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
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assertFalse(desc.enumerable);
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assertTrue(desc.configurable);
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assertEquals("function", typeof desc.get);
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assertEquals("function", typeof desc.set);
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// Check redefining getter for __proto__.
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function replaced_get() {};
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Object.defineProperty(Object.prototype, "__proto__", { get:replaced_get });
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desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
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assertFalse(desc.enumerable);
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assertTrue(desc.configurable);
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assertSame(replaced_get, desc.get);
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// Check redefining setter for __proto__.
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function replaced_set(x) {};
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Object.defineProperty(Object.prototype, "__proto__", { set:replaced_set });
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desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
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assertFalse(desc.enumerable);
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assertTrue(desc.configurable);
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assertSame(replaced_set, desc.set);
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// Check changing configurability of __proto__.
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Object.defineProperty(Object.prototype, "__proto__", { configurable:false });
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desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
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assertFalse(desc.enumerable);
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assertFalse(desc.configurable);
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assertSame(replaced_get, desc.get);
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assertSame(replaced_set, desc.set);
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// Check freezing Object.prototype completely.
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Object.freeze(Object.prototype);
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assertTrue(Object.isFrozen(Object.prototype));
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