1// Copyright 2008 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-debug-as debug
29// Get the Debug object exposed from the debug context global object.
30Debug = debug.Debug
31
32// Simple object.
33var a = {};
34
35// Create mirror for the object.
36var mirror = debug.MakeMirror(a);
37
38// Initially one reference from the global object.
39assertEquals(1, mirror.referencedBy().length);
40assertEquals(1, mirror.referencedBy(0).length);
41assertEquals(1, mirror.referencedBy(1).length);
42assertEquals(1, mirror.referencedBy(10).length);
43
44// Add some more references from simple objects and arrays.
45var b = {}
46b.a = a;
47assertEquals(2, mirror.referencedBy().length);
48var c = {}
49c.a = a;
50c.aa = a;
51c.aaa = a;
52assertEquals(3, mirror.referencedBy().length);
53function d(){};
54d.a = a
55assertEquals(4, mirror.referencedBy().length);
56e = [a,b,c,d];
57assertEquals(5, mirror.referencedBy().length);
58
59
60// Simple closure.
61function closure_simple(p) {
62  return function() { p = null; };
63}
64
65// This adds a reference (function context).
66f = closure_simple(a);
67assertEquals(6, mirror.referencedBy().length);
68// This clears the reference (in function context).
69f()
70assertEquals(5, mirror.referencedBy().length);
71
72// Use closure with eval - creates arguments array.
73function closure_eval(p, s) {
74  if (s) {
75    eval(s);
76  }
77  return function e(s) { eval(s); };
78}
79
80// This adds a references (function context).
81g = closure_eval(a);
82assertEquals(6, mirror.referencedBy().length);
83
84// Dynamically create a variable. This should create a context extension.
85h = closure_eval(null, "var x_");
86assertEquals(6, mirror.referencedBy().length);
87// Adds a reference when set.
88h("x_ = a");
89var x = mirror.referencedBy();
90assertEquals(7, mirror.referencedBy().length);
91// Removes a reference when cleared.
92h("x_ = null");
93assertEquals(6, mirror.referencedBy().length);
94
95// Check circular references.
96x = {}
97mirror = debug.MakeMirror(x);
98assertEquals(1, mirror.referencedBy().length);
99x.x = x;
100assertEquals(2, mirror.referencedBy().length);
101x = null;
102assertEquals(0, mirror.referencedBy().length);
103
104// Check many references.
105y = {}
106mirror = debug.MakeMirror(y);
107refs = [];
108for (var i = 0; i < 200; i++) {
109  refs[i] = {'y': y};
110}
111y = null;
112assertEquals(200, mirror.referencedBy().length);
113