e8e35eccac
Bailout to JS Array builtins if array's prototype is different from Array.prototype. Otherwise there might be inherited elements coming from this prototype. Review URL: http://codereview.chromium.org/2037008 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4649 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
109 lines
3.8 KiB
JavaScript
109 lines
3.8 KiB
JavaScript
// Copyright 2010 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 that shifting array of holes keeps it as array of holes
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(function() {
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var array = new Array(10);
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array.shift();
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assertFalse(0 in array);
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})();
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// Now check the case with array of holes and some elements on prototype.
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(function() {
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var len = 9;
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var array = new Array(len);
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Array.prototype[3] = "@3";
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Array.prototype[7] = "@7";
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assertEquals(len, array.length);
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for (var i = 0; i < array.length; i++) {
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assertEquals(array[i], Array.prototype[i]);
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}
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array.shift();
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assertEquals(len - 1, array.length);
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// Note that shift copies values from prototype into the array.
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assertEquals(array[2], Array.prototype[3]);
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assertTrue(array.hasOwnProperty(2));
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assertEquals(array[6], Array.prototype[7]);
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assertTrue(array.hasOwnProperty(6));
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// ... but keeps the rest as holes:
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Array.prototype[5] = "@5";
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assertEquals(array[5], Array.prototype[5]);
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assertFalse(array.hasOwnProperty(5));
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assertEquals(array[3], Array.prototype[3]);
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assertFalse(array.hasOwnProperty(3));
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assertEquals(array[7], Array.prototype[7]);
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assertFalse(array.hasOwnProperty(7));
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assertTrue(delete Array.prototype[3]);
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assertTrue(delete Array.prototype[5]);
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assertTrue(delete Array.prototype[7]);
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})();
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// Now check the case with array of holes and some elements on prototype
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// which is an array itself.
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(function() {
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var len = 9;
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var array = new Array(len);
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var array_proto = new Array();
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array_proto[3] = "@3";
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array_proto[7] = "@7";
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array.__proto__ = array_proto;
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assertEquals(len, array.length);
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for (var i = 0; i < array.length; i++) {
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assertEquals(array[i], array_proto[i]);
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}
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array.shift();
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assertEquals(len - 1, array.length);
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// Note that shift copies values from prototype into the array.
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assertEquals(array[2], array_proto[3]);
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assertTrue(array.hasOwnProperty(2));
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assertEquals(array[6], array_proto[7]);
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assertTrue(array.hasOwnProperty(6));
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// ... but keeps the rest as holes:
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array_proto[5] = "@5";
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assertEquals(array[5], array_proto[5]);
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assertFalse(array.hasOwnProperty(5));
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assertEquals(array[3], array_proto[3]);
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assertFalse(array.hasOwnProperty(3));
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assertEquals(array[7], array_proto[7]);
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assertFalse(array.hasOwnProperty(7));
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})();
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