1// Copyright 2010 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
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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// Check that unshifting array of holes keeps the original array
29// as array of holes
30(function() {
31  var array = new Array(10);
32  assertEquals(13, array.unshift('1st', '2ns', '3rd'));
33  assertTrue(0 in array);
34  assertTrue(1 in array);
35  assertTrue(2 in array);
36  assertFalse(3 in array);
37})();
38
39
40// Check that unshift with no args has a side-effect of
41// filling the holes with elements from the prototype
42// (if present, of course)
43(function() {
44  var len = 3;
45  var array = new Array(len);
46
47  var at0 = '@0';
48  var at2 = '@2';
49
50  Array.prototype[0] = at0;
51  Array.prototype[2] = at2;
52
53  // array owns nothing...
54  assertFalse(array.hasOwnProperty(0));
55  assertFalse(array.hasOwnProperty(1));
56  assertFalse(array.hasOwnProperty(2));
57
58  // ... but sees values from Array.prototype
59  assertEquals(array[0], at0);
60  assertEquals(array[1], undefined);
61  assertEquals(array[2], at2);
62
63  assertEquals(len, array.unshift());
64
65  assertTrue(delete Array.prototype[0]);
66  assertTrue(delete Array.prototype[2]);
67
68  // unshift makes array own 0 and 2...
69  assertTrue(array.hasOwnProperty(0));
70  assertFalse(array.hasOwnProperty(1));
71  assertTrue(array.hasOwnProperty(2));
72
73  // ... so they are not affected be delete.
74  assertEquals(array[0], at0);
75  assertEquals(array[1], undefined);
76  assertEquals(array[2], at2);
77})();
78
79
80// Now check the case with array of holes and some elements on prototype.
81(function() {
82  var len = 9;
83  var array = new Array(len);
84  Array.prototype[3] = "@3";
85  Array.prototype[7] = "@7";
86
87  assertEquals(len, array.length);
88  for (var i = 0; i < array.length; i++) {
89    assertEquals(array[i], Array.prototype[i]);
90  }
91
92  assertEquals(len + 1, array.unshift('head'));
93
94  assertEquals(len + 1, array.length);
95  // Note that unshift copies values from prototype into the array.
96  assertEquals(array[4], Array.prototype[3]);
97  assertTrue(array.hasOwnProperty(4));
98
99  assertEquals(array[8], Array.prototype[7]);
100  assertTrue(array.hasOwnProperty(8));
101
102  // ... but keeps the rest as holes:
103  Array.prototype[5] = "@5";
104  assertEquals(array[5], Array.prototype[5]);
105  assertFalse(array.hasOwnProperty(5));
106
107  assertEquals(array[3], Array.prototype[3]);
108  assertFalse(array.hasOwnProperty(3));
109
110  assertEquals(array[7], Array.prototype[7]);
111  assertFalse(array.hasOwnProperty(7));
112
113  assertTrue(delete Array.prototype[3]);
114  assertTrue(delete Array.prototype[5]);
115  assertTrue(delete Array.prototype[7]);
116})();
117
118// Check that unshift with no args has a side-effect of
119// filling the holes with elements from the prototype
120// (if present, of course)
121(function() {
122  var len = 3;
123  var array = new Array(len);
124
125  var at0 = '@0';
126  var at2 = '@2';
127
128  var array_proto = [];
129  array_proto[0] = at0;
130  array_proto[2] = at2;
131  array.__proto__ = array_proto;
132
133  // array owns nothing...
134  assertFalse(array.hasOwnProperty(0));
135  assertFalse(array.hasOwnProperty(1));
136  assertFalse(array.hasOwnProperty(2));
137
138  // ... but sees values from array_proto.
139  assertEquals(array[0], at0);
140  assertEquals(array[1], undefined);
141  assertEquals(array[2], at2);
142
143  assertEquals(len, array.unshift());
144
145  // unshift makes array own 0 and 2...
146  assertTrue(array.hasOwnProperty(0));
147  assertFalse(array.hasOwnProperty(1));
148  assertTrue(array.hasOwnProperty(2));
149
150  // ... so they are not affected be delete.
151  assertEquals(array[0], at0);
152  assertEquals(array[1], undefined);
153  assertEquals(array[2], at2);
154})();
155
156
157// Now check the case with array of holes and some elements on prototype.
158(function() {
159  var len = 9;
160  var array = new Array(len);
161  var array_proto = []
162  array_proto[3] = "@3";
163  array_proto[7] = "@7";
164  array.__proto__ = array_proto;
165
166  assertEquals(len, array.length);
167  for (var i = 0; i < array.length; i++) {
168    assertEquals(array[i], array_proto[i]);
169  }
170
171  assertEquals(len + 1, array.unshift('head'));
172
173  assertEquals(len + 1, array.length);
174  // Note that unshift copies values from prototype into the array.
175  assertEquals(array[4], array_proto[3]);
176  assertTrue(array.hasOwnProperty(4));
177
178  assertEquals(array[8], array_proto[7]);
179  assertTrue(array.hasOwnProperty(8));
180
181  // ... but keeps the rest as holes:
182  array_proto[5] = "@5";
183  assertEquals(array[5], array_proto[5]);
184  assertFalse(array.hasOwnProperty(5));
185
186  assertEquals(array[3], array_proto[3]);
187  assertFalse(array.hasOwnProperty(3));
188
189  assertEquals(array[7], array_proto[7]);
190  assertFalse(array.hasOwnProperty(7));
191})();
192
193// Check the behaviour when approaching maximal values for length.
194(function() {
195  for (var i = 0; i < 7; i++) {
196    try {
197      new Array((1 << 32) - 3).unshift(1, 2, 3, 4, 5);
198      throw 'Should have thrown RangeError';
199    } catch (e) {
200      assertTrue(e instanceof RangeError);
201    }
202
203    // Check smi boundary
204    var bigNum = (1 << 30) - 3;
205    assertEquals(bigNum + 7, new Array(bigNum).unshift(1, 2, 3, 4, 5, 6, 7));
206  }
207})();
208
209(function() {
210  for (var i = 0; i < 7; i++) {
211    var a = [6, 7, 8, 9];
212    a.unshift(1, 2, 3, 4, 5);
213    assertEquals([1, 2, 3, 4, 5, 6, 7, 8, 9], a);
214  }
215})();
216