1c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// Copyright 2013 the V8 project authors. All rights reserved. 2c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// Redistribution and use in source and binary forms, with or without 3c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// modification, are permitted provided that the following conditions are 4c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// met: 5c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// 6c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// * Redistributions of source code must retain the above copyright 7c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// notice, this list of conditions and the following disclaimer. 8c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// * Redistributions in binary form must reproduce the above 9c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// copyright notice, this list of conditions and the following 10c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// disclaimer in the documentation and/or other materials provided 11c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// with the distribution. 12c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// * Neither the name of Google Inc. nor the names of its 13c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// contributors may be used to endorse or promote products derived 14c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// from this software without specific prior written permission. 15c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// 16c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org 289259716434187c932704601f700375e53d865de8rossberg@chromium.orgfunction foo(a) { 299259716434187c932704601f700375e53d865de8rossberg@chromium.org for (var i = 0; i < 100; ++i) 309259716434187c932704601f700375e53d865de8rossberg@chromium.org a = new String(a); 319259716434187c932704601f700375e53d865de8rossberg@chromium.org return a; 329259716434187c932704601f700375e53d865de8rossberg@chromium.org} 33c1789eecd43bf9c5497636592bf14fa754d04c89machenbach@chromium.org 349259716434187c932704601f700375e53d865de8rossberg@chromium.orgvar expected = "hello"; 359259716434187c932704601f700375e53d865de8rossberg@chromium.orgfor (var i = 0; i < 4; ++i) { 369259716434187c932704601f700375e53d865de8rossberg@chromium.org if (i == 2) { 379259716434187c932704601f700375e53d865de8rossberg@chromium.org String.prototype.valueOf = function() { return 42; } 389259716434187c932704601f700375e53d865de8rossberg@chromium.org expected = "42"; 399259716434187c932704601f700375e53d865de8rossberg@chromium.org } 409259716434187c932704601f700375e53d865de8rossberg@chromium.org assertEquals(expected, "" + foo("hello")); 419259716434187c932704601f700375e53d865de8rossberg@chromium.org} 424a35c5a501e5b966f895ddea8e19c3ca232cb23fdslomov@chromium.org 434a35c5a501e5b966f895ddea8e19c3ca232cb23fdslomov@chromium.org// Make sure we look up "valueOf" only once. 444a35c5a501e5b966f895ddea8e19c3ca232cb23fdslomov@chromium.orgvar count = 0; 454a35c5a501e5b966f895ddea8e19c3ca232cb23fdslomov@chromium.orgvar x = new String("foo"); 464a35c5a501e5b966f895ddea8e19c3ca232cb23fdslomov@chromium.orgObject.defineProperty(x, "valueOf", 474a35c5a501e5b966f895ddea8e19c3ca232cb23fdslomov@chromium.org { get: function() { 484a35c5a501e5b966f895ddea8e19c3ca232cb23fdslomov@chromium.org count++; 494a35c5a501e5b966f895ddea8e19c3ca232cb23fdslomov@chromium.org return function() { 504a35c5a501e5b966f895ddea8e19c3ca232cb23fdslomov@chromium.org return 11; 514a35c5a501e5b966f895ddea8e19c3ca232cb23fdslomov@chromium.org } 524a35c5a501e5b966f895ddea8e19c3ca232cb23fdslomov@chromium.org } 534a35c5a501e5b966f895ddea8e19c3ca232cb23fdslomov@chromium.org }); 544a35c5a501e5b966f895ddea8e19c3ca232cb23fdslomov@chromium.orgfor (var i = 0; i < 3; i++) { 554a35c5a501e5b966f895ddea8e19c3ca232cb23fdslomov@chromium.org assertEquals("11", "" + x); 564a35c5a501e5b966f895ddea8e19c3ca232cb23fdslomov@chromium.org assertEquals(i + 1, count); 574a35c5a501e5b966f895ddea8e19c3ca232cb23fdslomov@chromium.org} 58