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 }