04f0e33229
We use foreign callbacks to make some properties shadow internal values but still behave as data properties from within JavaScript. This means when a value is passed to Object.defineProperty() on such a property, it should update the internal value instead of redefinind the property and destroying the shadowing. R=rossberg@chromium.org BUG=v8:1530 TEST=mjsunit/regress/regress-1530,test262/S15.3.3.1_A4 Review URL: http://codereview.chromium.org/8996008 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10279 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
70 lines
3.3 KiB
JavaScript
70 lines
3.3 KiB
JavaScript
// Copyright 2011 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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// Test that redefining the 'prototype' property of a function object
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// does actually set the internal value and does not screw up any
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// shadowing between said property and the internal value.
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var f = function() {};
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// Verify that normal assignment of 'prototype' property works properly
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// and updates the internal value.
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var x = { foo: 'bar' };
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f.prototype = x;
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assertSame(f.prototype, x);
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assertSame(f.prototype.foo, 'bar');
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assertSame(new f().foo, 'bar');
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assertSame(Object.getPrototypeOf(new f()), x);
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assertSame(Object.getOwnPropertyDescriptor(f, 'prototype').value, x);
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// Verify that 'prototype' behaves like a data property when it comes to
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// redefining with Object.defineProperty() and the internal value gets
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// updated.
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var y = { foo: 'baz' };
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Object.defineProperty(f, 'prototype', { value: y, writable: true });
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assertSame(f.prototype, y);
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assertSame(f.prototype.foo, 'baz');
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assertSame(new f().foo, 'baz');
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assertSame(Object.getPrototypeOf(new f()), y);
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assertSame(Object.getOwnPropertyDescriptor(f, 'prototype').value, y);
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// Verify that the previous redefinition didn't screw up callbacks and
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// the internal value still gets updated.
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var z = { foo: 'other' };
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f.prototype = z;
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assertSame(f.prototype, z);
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assertSame(f.prototype.foo, 'other');
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assertSame(new f().foo, 'other');
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assertSame(Object.getPrototypeOf(new f()), z);
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assertSame(Object.getOwnPropertyDescriptor(f, 'prototype').value, z);
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// Verify that non-writability of other properties is respected.
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assertThrows("Object.defineProperty(f, 'name', { value: {} })");
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assertThrows("Object.defineProperty(f, 'length', { value: {} })");
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assertThrows("Object.defineProperty(f, 'caller', { value: {} })");
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assertThrows("Object.defineProperty(f, 'arguments', { value: {} })");
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