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: --allow-natives-syntax --expose-gc
29// Flags: --noincremental-marking
30
31// Check that objects that are used for prototypes are in the fast mode.
32
33function Super() {
34}
35
36
37function Sub() {
38}
39
40
41function AddProps(obj) {
42  for (var i = 0; i < 26; i++) {
43    obj["x" + i] = 0;
44  }
45}
46
47
48function DoProtoMagic(proto, set__proto__) {
49  if (set__proto__) {
50    (new Sub()).__proto__ = proto;
51  } else {
52    Sub.prototype = proto;
53    // Need to instantiate Sub to mark .prototype as prototype. Make sure the
54    // instantiated object is used so that the allocation is not optimized away.
55    %DebugPrint(new Sub());
56  }
57}
58
59
60function test(use_new, add_first, set__proto__) {
61  var proto = use_new ? new Super() : {};
62
63  // New object is fast.
64  assertTrue(%HasFastProperties(proto));
65
66  if (add_first) {
67    AddProps(proto);
68    // Adding this many properties makes it slow.
69    assertFalse(%HasFastProperties(proto));
70    DoProtoMagic(proto, set__proto__);
71    // Making it a prototype makes it fast again.
72    assertTrue(%HasFastProperties(proto));
73  } else {
74    DoProtoMagic(proto, set__proto__);
75    // Still fast
76    assertTrue(%HasFastProperties(proto));
77    AddProps(proto);
78    // Still fast.
79    assertTrue(%HasFastProperties(proto));
80  }
81  return proto;
82}
83
84// TODO(mstarzinger): This test fails easily if gc happens at the wrong time.
85gc();
86
87for (var i = 0; i < 4; i++) {
88  var set__proto__ = ((i & 1) != 0);
89  var use_new = ((i & 2) != 0);
90
91  test(use_new, true, set__proto__);
92  test(use_new, false, set__proto__);
93}
94
95
96var x = {a: 1, b: 2, c: 3};
97var o = { __proto__: x };
98assertTrue(%HasFastProperties(x));
99for (key in x) {
100  assertTrue(key == 'a');
101  break;
102}
103delete x.b;
104for (key in x) {
105  assertTrue(key == 'a');
106  break;
107}
108assertTrue(%HasFastProperties(x));
109x.d = 4;
110assertTrue(%HasFastProperties(x));
111for (key in x) {
112  assertTrue(key == 'a');
113  break;
114}
115