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 // We use the has() function to avoid relying on a functioning 29 // implementation of 'in'. 30 function has(o, k) { return typeof o[k] !== 'undefined'; } 31 32 assertTrue(delete null); 33 assertTrue(delete 2); 34 assertTrue(delete 'foo'); 35 assertTrue(delete Number(7)); 36 assertTrue(delete new Number(8)); 37 38 assertTrue(delete {}.x); 39 assertTrue(delete {}.y); 40 assertTrue(delete {}.toString); 41 42 x = 42; 43 assertEquals(42, x); 44 assertTrue(delete x); 45 assertTrue(typeof x === 'undefined', "x is gone"); 46 47 var y = 87; // should have DontDelete attribute 48 assertEquals(87, y); 49 assertFalse(delete y, "don't delete"); 50 assertFalse(typeof y === 'undefined'); 51 assertEquals(87, y); 52 53 var o = { x: 42, y: 87 }; 54 assertTrue(has(o, 'x')); 55 assertTrue(has(o, 'y')); 56 assertTrue(delete o.x); 57 assertFalse(has(o, 'x')); 58 assertTrue(has(o, 'y')); 59 assertTrue(delete o['y']); 60 assertFalse(has(o, 'x')); 61 assertFalse(has(o, 'y')); 62 63 64 var o = {}; 65 for (var i = 0x0020; i < 0x02ff; i+=2) { 66 o[String.fromCharCode(i)] = i; 67 o[String.fromCharCode(i+1)] = i+1; 68 } 69 for (var i = 0x0020; i < 0x02ff; i+=2) { 70 assertTrue(delete o[String.fromCharCode(i)]); 71 } 72 for (var i = 0x0020; i < 0x02ff; i+=2) { 73 assertFalse(has(o, String.fromCharCode(i)), "deleted (" + i + ")"); 74 assertTrue(has(o, String.fromCharCode(i+1)), "still here (" + i + ")"); 75 } 76 77 78 var a = [0,1,2]; 79 assertTrue(has(a, 0)); 80 assertTrue(delete a[0]); 81 assertFalse(has(a, 0), "delete 0"); 82 assertEquals(1, a[1]); 83 assertEquals(2, a[2]); 84 assertTrue(delete a[100], "delete 100"); 85 assertTrue(delete a[Math.pow(2,31)-1], "delete 2^31-1"); 86 assertFalse(has(a, 0), "delete 0"); 87 assertEquals(1, a[1]); 88 assertEquals(2, a[2]); 89 90 91 var a = [0,1,2]; 92 assertEquals(3, a.length); 93 assertTrue(delete a[2]); 94 assertEquals(3, a.length); 95 assertTrue(delete a[0]); 96 assertEquals(3, a.length); 97 assertTrue(delete a[1]); 98 assertEquals(3, a.length); 99 100 101 var o = {}; 102 o[Math.pow(2,30)-1] = 0; 103 o[Math.pow(2,31)-1] = 0; 104 o[1] = 0; 105 assertTrue(delete o[0]); 106 assertTrue(delete o[Math.pow(2,30)]); 107 assertFalse(has(o, 0), "delete 0"); 108 assertFalse(has(o, Math.pow(2,30))); 109 assertTrue(has(o, 1)); 110 assertTrue(has(o, Math.pow(2,30)-1)); 111 assertTrue(has(o, Math.pow(2,31)-1)); 112 113 assertTrue(delete o[Math.pow(2,30)-1]); 114 assertTrue(has(o, 1)); 115 assertFalse(has(o, Math.pow(2,30)-1), "delete 2^30-1"); 116 assertTrue(has(o, Math.pow(2,31)-1)); 117 118 assertTrue(delete o[1]); 119 assertFalse(has(o, 1), "delete 1"); 120 assertFalse(has(o, Math.pow(2,30)-1), "delete 2^30-1"); 121 assertTrue(has(o, Math.pow(2,31)-1)); 122 123 assertTrue(delete o[Math.pow(2,31)-1]); 124 assertFalse(has(o, 1), "delete 1"); 125 assertFalse(has(o, Math.pow(2,30)-1), "delete 2^30-1"); 126 assertFalse(has(o, Math.pow(2,31)-1), "delete 2^31-1"); 127 128 129 var a = []; 130 a[Math.pow(2,30)-1] = 0; 131 a[Math.pow(2,31)-1] = 0; 132 a[1] = 0; 133 assertTrue(delete a[0]); 134 assertTrue(delete a[Math.pow(2,30)]); 135 assertFalse(has(a, 0), "delete 0"); 136 assertFalse(has(a, Math.pow(2,30)), "delete 2^30"); 137 assertTrue(has(a, 1)); 138 assertTrue(has(a, Math.pow(2,30)-1)); 139 assertTrue(has(a, Math.pow(2,31)-1)); 140 assertEquals(Math.pow(2,31), a.length); 141 142 assertTrue(delete a[Math.pow(2,30)-1]); 143 assertTrue(has(a, 1)); 144 assertFalse(has(a, Math.pow(2,30)-1), "delete 2^30-1"); 145 assertTrue(has(a, Math.pow(2,31)-1)); 146 assertEquals(Math.pow(2,31), a.length); 147 148 assertTrue(delete a[1]); 149 assertFalse(has(a, 1), "delete 1"); 150 assertFalse(has(a, Math.pow(2,30)-1), "delete 2^30-1"); 151 assertTrue(has(a, Math.pow(2,31)-1)); 152 assertEquals(Math.pow(2,31), a.length); 153 154 assertTrue(delete a[Math.pow(2,31)-1]); 155 assertFalse(has(a, 1), "delete 1"); 156 assertFalse(has(a, Math.pow(2,30)-1), "delete 2^30-1"); 157 assertFalse(has(a, Math.pow(2,31)-1), "delete 2^31-1"); 158 assertEquals(Math.pow(2,31), a.length); 159 160 // Check that a LoadIC for a dictionary field works, even 161 // when the dictionary probe misses. 162 function load_deleted_property_using_IC() { 163 var x = new Object(); 164 x.a = 3; 165 x.b = 4; 166 x.c = 5; 167 168 delete x.c; 169 assertEquals(3, load_a(x)); 170 assertEquals(3, load_a(x)); 171 delete x.a; 172 assertTrue(typeof load_a(x) === 'undefined', "x.a is gone"); 173 assertTrue(typeof load_a(x) === 'undefined', "x.a is gone"); 174 } 175 176 function load_a(x) { 177 return x.a; 178 } 179 180 load_deleted_property_using_IC(); 181
