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// Running this test with --trace_gc will show heap size growth due to
29// leaking objects via embedded maps in optimized code.
30
31var counter = 0;
32
33function nextid() {
34  counter += 1;
35  return counter;
36}
37
38function Scope() {
39  this.id = nextid();
40  this.parent = null;
41  this.left = null;
42  this.right = null;
43  this.head = null;
44  this.tail = null;
45  this.counter = 0;
46}
47
48Scope.prototype = {
49  new: function() {
50    var Child,
51        child;
52    Child = function() {};
53    Child.prototype = this;
54    child = new Child();
55    child.id = nextid();
56    child.parent = this;
57    child.left = this.last;
58    child.right = null;
59    child.head = null;
60    child.tail = null;
61    child.counter = 0;
62    if (this.head) {
63      this.tail.right = child;
64      this.tail = child;
65    } else {
66      this.head = this.tail = child;
67    }
68    return child;
69  },
70
71  destroy: function() {
72    if ($root == this) return;
73    var parent = this.parent;
74    if (parent.head == this) parent.head = this.right;
75    if (parent.tail == this) parent.tail = this.left;
76    if (this.left) this.left.right = this.right;
77    if (this.right) this.right.left = this.left;
78  }
79};
80
81function inc(scope) {
82  scope.counter = scope.counter + 1;
83}
84
85var $root = new Scope();
86
87n = 100000;
88m = 10;
89
90function doit() {
91   var a = $root.new();
92   var b = a.new();
93   inc(b);
94   if (i > m) $root.head.destroy();
95}
96
97for (var i = 0; i < n; i++) {
98   doit();
99}
100