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 var slow = {}; 29 var p = {}; 30 31 slow.__proto__ = p; 32 slow.x = 10; 33 slow.y = 10; 34 Object.defineProperty(p, "x", {writable:false, value:5}); 35 36 function c(p) { 37 return {__proto__: p}; 38 } 39 40 function s(v) { 41 return v.x = 1; 42 } 43 44 function s_strict(v) { 45 "use strict"; 46 v.x = 1; 47 } 48 49 var o1 = c(slow); 50 var o2 = c(slow); 51 var o1_strict = c(slow); 52 var o2_strict = c(slow); 53 var o3 = c(slow); 54 var o4 = c(slow); 55 56 // Make s slow. 57 // Do this after using slow as prototype, since using an object as prototype 58 // kicks it back into fast mode. 59 delete slow.y; 60 61 s(o1); 62 s(o2); 63 s_strict(o1_strict); 64 s_strict(o2_strict); 65 66 delete slow.x; 67 // Directly setting x should fail. 68 o3.x = 20 69 assertEquals(5, o3.x); 70 71 // Setting x through IC should fail. 72 s(o4); 73 assertEquals(5, o4.x); 74 assertThrows("s_strict(o4);", TypeError); 75
