JezK
Edit File: regress-1530.js
// Copyright 2011 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. // Test that redefining the 'prototype' property of a function object // does actually set the internal value and does not screw up any // shadowing between said property and the internal value. var f = function() {}; // Verify that normal assignment of 'prototype' property works properly // and updates the internal value. var x = { foo: 'bar' }; f.prototype = x; assertSame(f.prototype, x); assertSame(f.prototype.foo, 'bar'); assertSame(new f().foo, 'bar'); assertSame(Object.getPrototypeOf(new f()), x); assertSame(Object.getOwnPropertyDescriptor(f, 'prototype').value, x); // Verify that 'prototype' behaves like a data property when it comes to // redefining with Object.defineProperty() and the internal value gets // updated. var y = { foo: 'baz' }; Object.defineProperty(f, 'prototype', { value: y, writable: true }); assertSame(f.prototype, y); assertSame(f.prototype.foo, 'baz'); assertSame(new f().foo, 'baz'); assertSame(Object.getPrototypeOf(new f()), y); assertSame(Object.getOwnPropertyDescriptor(f, 'prototype').value, y); // Verify that the previous redefinition didn't screw up callbacks and // the internal value still gets updated. var z = { foo: 'other' }; f.prototype = z; assertSame(f.prototype, z); assertSame(f.prototype.foo, 'other'); assertSame(new f().foo, 'other'); assertSame(Object.getPrototypeOf(new f()), z); assertSame(Object.getOwnPropertyDescriptor(f, 'prototype').value, z); // Verify that non-writability of other properties is respected. assertThrows("Object.defineProperty(f, 'name', { value: {} })"); assertThrows("Object.defineProperty(f, 'length', { value: {} })"); assertThrows("Object.defineProperty(f, 'caller', { value: {} })"); assertThrows("Object.defineProperty(f, 'arguments', { value: {} })");