1 /* 2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /** 25 * JDK-8044750: megamorphic getter for scope objects does not call __noSuchProperty__ hook 26 * 27 * @test 28 * @option --unstable-relink-threshold=16 29 * @run 30 */ 31 32 __noSuchProperty__ = function(name) { 33 return 1; 34 } 35 36 function func(obj) { 37 with(obj) { 38 // this "foo" getter site becomes megamorphic 39 // due to different 'with' scope objects. 40 foo; 41 } 42 } 43 44 var LIMIT = 20; // should be more than megamorphic threshold set via @option 45 46 for (var i = 0; i < LIMIT; i++) { 47 var obj = {}; 48 obj.foo = i; 49 obj[i] = i; 50 func(obj); 51 } 52 53 // pass a 'with' scope object that does not have 'foo'. 54 // callsite inside func should see __noSuchProperty__ 55 // hook on global scope object. 56 func({}); 57 58 function checkFoo() { 59 with({}) { 60 try { 61 foo; 62 return true; 63 } catch (e) { 64 return false; 65 } 66 } 67 } 68 69 var oldNoSuchProperty = this.__noSuchProperty__; 70 delete this.__noSuchProperty__; 71 72 // keep deleting/restorting __noSuchProperty__ alternatively 73 // to make "foo" access in checkFoo function megamorphic! 74 75 for (var i = 0; i < LIMIT; i++) { 76 // no __noSuchProperty__ and 'with' scope object has no 'foo' 77 delete __noSuchProperty__; 78 Assert.assertFalse(checkFoo(), "Expected false in iteration " + i); 79 80 // __noSuchProperty__ is exists but 'with' scope object has no 'foo' 81 this.__noSuchProperty__ = oldNoSuchProperty; 82 Assert.assertTrue(checkFoo(), "Expected true in iteration " + i); 83 }