1// Copyright 2012 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// Flags: --expose-gc 29 30// Create a transition tree A (no descriptors) -> B (descriptor for a) -> C 31// (descriptor for a and c), that all share the descriptor array [a,c]. C is the 32// owner of the descriptor array. 33var o = {}; 34o.a = 1; 35o.c = 2; 36 37// Add a transition B -> D where D has its own descriptor array [a,b] where b is 38// a constant function. 39var o1 = {}; 40o1.a = 1; 41 42// Install an enumeration cache in the descriptor array [a,c] at map B. 43for (var x in o1) { } 44o1.b = function() { return 1; }; 45 46// Return ownership of the descriptor array [a,c] to B and trim it to [a]. 47o = null; 48gc(); 49 50// Convert the transition B -> D into a transition to B -> E so that E uses the 51// instance descriptors [a,b] with b being a field. 52var o2 = {}; 53o2.a = 1; 54o2.b = 10; 55 56// Create an object with map B and iterate over it. 57var o3 = {}; 58o3.a = 1; 59 60for (var y in o3) { } 61