1 // Copyright 2013 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 function s(v) { 29 v.x = 1; 30 } 31 32 function c(p) { 33 return {__proto__: p}; 34 } 35 36 var p = {}; 37 38 // Make p the last prototype in the chain. 39 p.__proto__ = null; 40 41 var o1 = c(p); 42 var o2 = c(p); 43 var o3 = c(p); 44 var o4 = c(p); 45 46 // Make y go to slow mode. 47 // Do this after using p as prototype, since using an object as prototype kicks 48 // it back into fast mode. 49 p.y = 1; 50 delete p.y; 51 52 // Initialize the store IC. 53 s(o1); 54 s(o2); 55 56 // Do something with x in slow-mode p. 57 Object.defineProperty(p, "x", { writable: false, value: 5 }); 58 59 // Verify that directly setting x fails. 60 o3.x = 10; 61 assertEquals(5, o3.x); 62 63 // Verify that setting x through the IC fails. 64 s(o4); 65 assertEquals(5, o4.x); 66
