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| 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 |
| 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 // Tests the object.defineProperty method - ES 15.2.3.6 |
| 29 |
| 30 |
| 31 |
| 32 // Check that an exception is thrown when null is passed as object. |
| 33 try { |
| 34 Object.defineProperty(null, null, null); |
| 35 assertTrue(false); |
| 36 } catch (e) { |
| 37 assertTrue(/called on non-object/.test(e)); |
| 38 } |
| 39 |
| 40 // Check that an exception is thrown when undefined is passed as object. |
| 41 try { |
| 42 Object.defineProperty(undefined, undefined, undefined); |
| 43 assertTrue(false); |
| 44 } catch (e) { |
| 45 assertTrue(/called on non-object/.test(e)); |
| 46 } |
| 47 |
| 48 // Check that an exception is thrown when non-object is passed as object. |
| 49 try { |
| 50 Object.defineProperty(0, "foo", undefined); |
| 51 assertTrue(false); |
| 52 } catch (e) { |
| 53 assertTrue(/called on non-object/.test(e)); |
| 54 } |
| 55 |
| 56 // Object |
| 57 var obj1 = {}; |
| 58 |
| 59 // Values |
| 60 var val1 = 0; |
| 61 var val2 = 0; |
| 62 var val3 = 0; |
| 63 |
| 64 // Descriptors |
| 65 var emptyDesc = {}; |
| 66 |
| 67 var accessorConfigurable = { |
| 68 set: function() { val1++; }, |
| 69 get: function() { return val1; }, |
| 70 configurable: true |
| 71 }; |
| 72 |
| 73 var accessorNoConfigurable = { |
| 74 set: function() { val2++; }, |
| 75 get: function() { return val2; }, |
| 76 configurable: false |
| 77 }; |
| 78 |
| 79 var accessorOnlySet = { |
| 80 set: function() { val3++; }, |
| 81 configurable: true |
| 82 }; |
| 83 |
| 84 var accessorOnlyGet = { |
| 85 get: function() { return val3; }, |
| 86 configurable: true |
| 87 }; |
| 88 |
| 89 var accessorDefault = {set: function(){} }; |
| 90 |
| 91 var dataConfigurable = { value: 1000, configurable: true }; |
| 92 |
| 93 var dataNoConfigurable = { value: 2000, configurable: false }; |
| 94 |
| 95 var dataWritable = { value: 3000, writable: true}; |
| 96 |
| 97 |
| 98 // Check that we can't add property with undefined attributes. |
| 99 try { |
| 100 Object.defineProperty(obj1, "foo", undefined); |
| 101 assertTrue(false); |
| 102 } catch (e) { |
| 103 assertTrue(/must be an object/.test(e)); |
| 104 } |
| 105 |
| 106 // Make sure that we can add a property with an empty descriptor and |
| 107 // that it has the default descriptor values. |
| 108 Object.defineProperty(obj1, "foo", emptyDesc); |
| 109 |
| 110 // foo should be undefined as it has no get, set or value |
| 111 assertEquals(undefined, obj1.foo); |
| 112 |
| 113 // We should, however, be able to retrieve the propertydescriptor which should |
| 114 // have all default values (according to 8.6.1). |
| 115 var desc = Object.getOwnPropertyDescriptor(obj1, "foo"); |
| 116 assertFalse(desc.configurable); |
| 117 assertFalse(desc.enumerable); |
| 118 assertFalse(desc.writable); |
| 119 assertEquals(desc.get, undefined); |
| 120 assertEquals(desc.set, undefined); |
| 121 assertEquals(desc.value, undefined); |
| 122 |
| 123 // Make sure that getOwnPropertyDescriptor does not return a descriptor |
| 124 // with default values if called with non existing property (otherwise |
| 125 // the test above is invalid). |
| 126 desc = Object.getOwnPropertyDescriptor(obj1, "bar"); |
| 127 assertEquals(desc, undefined); |
| 128 |
| 129 // Make sure that foo can't be reset (as configurable is false). |
| 130 try { |
| 131 Object.defineProperty(obj1, "foo", accessorConfigurable); |
| 132 } catch (e) { |
| 133 assertTrue(/Cannot redefine property/.test(e)); |
| 134 } |
| 135 |
| 136 |
| 137 // Accessor properties |
| 138 |
| 139 Object.defineProperty(obj1, "bar", accessorConfigurable); |
| 140 desc = Object.getOwnPropertyDescriptor(obj1, "bar"); |
| 141 assertTrue(desc.configurable); |
| 142 assertFalse(desc.enumerable); |
| 143 assertEquals(desc.writable, undefined); |
| 144 assertEquals(desc.get, accessorConfigurable.get); |
| 145 assertEquals(desc.set, accessorConfigurable.set); |
| 146 assertEquals(desc.value, undefined); |
| 147 assertEquals(1, obj1.bar = 1); |
| 148 assertEquals(1, val1); |
| 149 assertEquals(1, obj1.bar = 1); |
| 150 assertEquals(2, val1); |
| 151 assertEquals(2, obj1.bar); |
| 152 |
| 153 // Redefine bar with non configurable test |
| 154 Object.defineProperty(obj1, "bar", accessorNoConfigurable); |
| 155 desc = Object.getOwnPropertyDescriptor(obj1, "bar"); |
| 156 assertFalse(desc.configurable); |
| 157 assertFalse(desc.enumerable); |
| 158 assertEquals(desc.writable, undefined); |
| 159 assertEquals(desc.get, accessorNoConfigurable.get); |
| 160 assertEquals(desc.set, accessorNoConfigurable.set); |
| 161 assertEquals(desc.value, undefined); |
| 162 assertEquals(1, obj1.bar = 1); |
| 163 assertEquals(2, val1); |
| 164 assertEquals(1, val2); |
| 165 assertEquals(1, obj1.bar = 1) |
| 166 assertEquals(2, val1); |
| 167 assertEquals(2, val2); |
| 168 assertEquals(2, obj1.bar); |
| 169 |
| 170 // Try to redefine bar again - should fail as configurable is false. |
| 171 try { |
| 172 Object.defineProperty(obj1, "bar", accessorConfigurable); |
| 173 assertTrue(false); |
| 174 } catch(e) { |
| 175 assertTrue(/Cannot redefine property/.test(e)); |
| 176 } |
| 177 |
| 178 // Try to redefine bar again using the data descriptor - should fail. |
| 179 try { |
| 180 Object.defineProperty(obj1, "bar", dataConfigurable); |
| 181 assertTrue(false); |
| 182 } catch(e) { |
| 183 assertTrue(/Cannot redefine property/.test(e)); |
| 184 } |
| 185 |
| 186 // Redefine using same descriptor - should succeed. |
| 187 Object.defineProperty(obj1, "bar", accessorNoConfigurable); |
| 188 desc = Object.getOwnPropertyDescriptor(obj1, "bar"); |
| 189 assertFalse(desc.configurable); |
| 190 assertFalse(desc.enumerable); |
| 191 assertEquals(desc.writable, undefined); |
| 192 assertEquals(desc.get, accessorNoConfigurable.get); |
| 193 assertEquals(desc.set, accessorNoConfigurable.set); |
| 194 assertEquals(desc.value, undefined); |
| 195 assertEquals(1, obj1.bar = 1); |
| 196 assertEquals(2, val1); |
| 197 assertEquals(3, val2); |
| 198 assertEquals(1, obj1.bar = 1) |
| 199 assertEquals(2, val1); |
| 200 assertEquals(4, val2); |
| 201 assertEquals(4, obj1.bar); |
| 202 |
| 203 // Define an accessor that has only a setter |
| 204 Object.defineProperty(obj1, "setOnly", accessorOnlySet); |
| 205 desc = Object.getOwnPropertyDescriptor(obj1, "setOnly"); |
| 206 assertTrue(desc.configurable); |
| 207 assertFalse(desc.enumerable); |
| 208 assertEquals(desc.set, accessorOnlySet.set); |
| 209 assertEquals(desc.writable, undefined); |
| 210 assertEquals(desc.value, undefined); |
| 211 assertEquals(desc.get, undefined); |
| 212 assertEquals(1, obj1.setOnly = 1); |
| 213 assertEquals(1, val3); |
| 214 |
| 215 // Add a getter - should not touch the setter |
| 216 Object.defineProperty(obj1, "setOnly", accessorOnlyGet); |
| 217 desc = Object.getOwnPropertyDescriptor(obj1, "setOnly"); |
| 218 assertTrue(desc.configurable); |
| 219 assertFalse(desc.enumerable); |
| 220 assertEquals(desc.get, accessorOnlyGet.get); |
| 221 assertEquals(desc.set, accessorOnlySet.set); |
| 222 assertEquals(desc.writable, undefined); |
| 223 assertEquals(desc.value, undefined); |
| 224 assertEquals(1, obj1.setOnly = 1); |
| 225 assertEquals(2, val3); |
| 226 |
| 227 // The above should also work if redefining just a getter or setter on |
| 228 // an existing property with both a getter and a setter. |
| 229 Object.defineProperty(obj1, "both", accessorConfigurable); |
| 230 |
| 231 Object.defineProperty(obj1, "both", accessorOnlySet); |
| 232 desc = Object.getOwnPropertyDescriptor(obj1, "both"); |
| 233 assertTrue(desc.configurable); |
| 234 assertFalse(desc.enumerable); |
| 235 assertEquals(desc.set, accessorOnlySet.set); |
| 236 assertEquals(desc.get, accessorConfigurable.get); |
| 237 assertEquals(desc.writable, undefined); |
| 238 assertEquals(desc.value, undefined); |
| 239 assertEquals(1, obj1.both = 1); |
| 240 assertEquals(3, val3); |
| 241 |
| 242 |
| 243 // Data properties |
| 244 |
| 245 Object.defineProperty(obj1, "foobar", dataConfigurable); |
| 246 desc = Object.getOwnPropertyDescriptor(obj1, "foobar"); |
| 247 assertEquals(obj1.foobar, 1000); |
| 248 assertEquals(desc.value, 1000); |
| 249 assertTrue(desc.configurable); |
| 250 assertFalse(desc.writable); |
| 251 assertFalse(desc.enumerable); |
| 252 assertEquals(desc.get, undefined); |
| 253 assertEquals(desc.set, undefined); |
| 254 //Try writing to non writable attribute - should remain 1000 |
| 255 obj1.foobar = 1001; |
| 256 assertEquals(obj1.foobar, 1000); |
| 257 |
| 258 |
| 259 // Redefine to writable descriptor - now writing to foobar should be allowed |
| 260 Object.defineProperty(obj1, "foobar", dataWritable); |
| 261 desc = Object.getOwnPropertyDescriptor(obj1, "foobar"); |
| 262 assertEquals(obj1.foobar, 3000); |
| 263 assertEquals(desc.value, 3000); |
| 264 // Note that since dataWritable does not define configurable the configurable |
| 265 // setting from the redefined property (in this case true) is used. |
| 266 assertTrue(desc.configurable); |
| 267 assertTrue(desc.writable); |
| 268 assertFalse(desc.enumerable); |
| 269 assertEquals(desc.get, undefined); |
| 270 assertEquals(desc.set, undefined); |
| 271 // Writing to the property should now be allowed |
| 272 obj1.foobar = 1001; |
| 273 assertEquals(obj1.foobar, 1001); |
| 274 |
| 275 |
| 276 // Redefine with non configurable data property. |
| 277 Object.defineProperty(obj1, "foobar", dataNoConfigurable); |
| 278 desc = Object.getOwnPropertyDescriptor(obj1, "foobar"); |
| 279 assertEquals(obj1.foobar, 2000); |
| 280 assertEquals(desc.value, 2000); |
| 281 assertFalse(desc.configurable); |
| 282 assertFalse(desc.writable); |
| 283 assertFalse(desc.enumerable); |
| 284 assertEquals(desc.get, undefined); |
| 285 assertEquals(desc.set, undefined); |
| 286 |
| 287 // Try redefine again - shold fail because configurable is now false. |
| 288 try { |
| 289 Object.defineProperty(obj1, "foobar", dataConfigurable); |
| 290 assertTrue(false); |
| 291 } catch (e) { |
| 292 assertTrue(/Cannot redefine property/.test(e)); |
| 293 } |
| 294 |
| 295 // Try redefine again with accessor property - shold also fail. |
| 296 try { |
| 297 Object.defineProperty(obj1, "foobar", dataConfigurable); |
| 298 assertTrue(false); |
| 299 } catch (e) { |
| 300 assertTrue(/Cannot redefine property/.test(e)); |
| 301 } |
| 302 |
| 303 |
| 304 // Redifine with the same descriptor - should succeed (step 6). |
| 305 Object.defineProperty(obj1, "foobar", dataNoConfigurable); |
| 306 desc = Object.getOwnPropertyDescriptor(obj1, "foobar"); |
| 307 assertEquals(obj1.foobar, 2000); |
| 308 assertEquals(desc.value, 2000); |
| 309 assertFalse(desc.configurable); |
| 310 assertFalse(desc.writable); |
| 311 assertFalse(desc.enumerable); |
| 312 assertEquals(desc.get, undefined); |
| 313 assertEquals(desc.set, undefined); |
| 314 |
| 315 |
| 316 // New object |
| 317 var obj2 = {}; |
| 318 |
| 319 // Make accessor - redefine to data |
| 320 Object.defineProperty(obj2, "foo", accessorConfigurable); |
| 321 |
| 322 // Redefine to data property |
| 323 Object.defineProperty(obj2, "foo", dataConfigurable); |
| 324 desc = Object.getOwnPropertyDescriptor(obj2, "foo"); |
| 325 assertEquals(obj2.foo, 1000); |
| 326 assertEquals(desc.value, 1000); |
| 327 assertTrue(desc.configurable); |
| 328 assertFalse(desc.writable); |
| 329 assertFalse(desc.enumerable); |
| 330 assertEquals(desc.get, undefined); |
| 331 assertEquals(desc.set, undefined); |
| 332 |
| 333 |
| 334 // Redefine back to accessor |
| 335 Object.defineProperty(obj2, "foo", accessorConfigurable); |
| 336 desc = Object.getOwnPropertyDescriptor(obj2, "foo"); |
| 337 assertTrue(desc.configurable); |
| 338 assertFalse(desc.enumerable); |
| 339 assertEquals(desc.writable, undefined); |
| 340 assertEquals(desc.get, accessorConfigurable.get); |
| 341 assertEquals(desc.set, accessorConfigurable.set); |
| 342 assertEquals(desc.value, undefined); |
| 343 assertEquals(1, obj2.foo = 1); |
| 344 assertEquals(3, val1); |
| 345 assertEquals(4, val2); |
| 346 assertEquals(3, obj2.foo); |
| 347 |
| 348 // Make data - redefine to accessor |
| 349 Object.defineProperty(obj2, "bar", dataConfigurable) |
| 350 |
| 351 // Redefine to accessor property |
| 352 Object.defineProperty(obj2, "bar", accessorConfigurable); |
| 353 desc = Object.getOwnPropertyDescriptor(obj2, "bar"); |
| 354 assertTrue(desc.configurable); |
| 355 assertFalse(desc.enumerable); |
| 356 assertEquals(desc.writable, undefined); |
| 357 assertEquals(desc.get, accessorConfigurable.get); |
| 358 assertEquals(desc.set, accessorConfigurable.set); |
| 359 assertEquals(desc.value, undefined); |
| 360 assertEquals(1, obj2.bar = 1); |
| 361 assertEquals(4, val1); |
| 362 assertEquals(4, val2); |
| 363 assertEquals(4, obj2.foo); |
| 364 |
| 365 // Redefine back to data property |
| 366 Object.defineProperty(obj2, "bar", dataConfigurable); |
| 367 desc = Object.getOwnPropertyDescriptor(obj2, "bar"); |
| 368 assertEquals(obj2.bar, 1000); |
| 369 assertEquals(desc.value, 1000); |
| 370 assertTrue(desc.configurable); |
| 371 assertFalse(desc.writable); |
| 372 assertFalse(desc.enumerable); |
| 373 assertEquals(desc.get, undefined); |
| 374 assertEquals(desc.set, undefined); |
| 375 |
| 376 |
| 377 // Redefinition of an accessor defined using __defineGetter__ and |
| 378 // __defineSetter__ |
| 379 function get(){return this.x} |
| 380 function set(x){this.x=x}; |
| 381 |
| 382 var obj3 = {x:1000}; |
| 383 obj3.__defineGetter__("foo", get); |
| 384 obj3.__defineSetter__("foo", set); |
| 385 |
| 386 desc = Object.getOwnPropertyDescriptor(obj3, "foo"); |
| 387 assertTrue(desc.configurable); |
| 388 assertTrue(desc.enumerable); |
| 389 assertEquals(desc.writable, undefined); |
| 390 assertEquals(desc.get, get); |
| 391 assertEquals(desc.set, set); |
| 392 assertEquals(desc.value, undefined); |
| 393 assertEquals(1, obj3.foo = 1); |
| 394 assertEquals(1, obj3.x); |
| 395 assertEquals(1, obj3.foo); |
| 396 |
| 397 // Redefine to accessor property (non configurable) - note that enumerable |
| 398 // which we do not redefine should remain the same (true). |
| 399 Object.defineProperty(obj3, "foo", accessorNoConfigurable); |
| 400 desc = Object.getOwnPropertyDescriptor(obj3, "foo"); |
| 401 assertFalse(desc.configurable); |
| 402 assertTrue(desc.enumerable); |
| 403 assertEquals(desc.writable, undefined); |
| 404 assertEquals(desc.get, accessorNoConfigurable.get); |
| 405 assertEquals(desc.set, accessorNoConfigurable.set); |
| 406 assertEquals(desc.value, undefined); |
| 407 assertEquals(1, obj3.foo = 1); |
| 408 assertEquals(5, val2); |
| 409 assertEquals(5, obj3.foo); |
| 410 |
| 411 |
| 412 obj3.__defineGetter__("bar", get); |
| 413 obj3.__defineSetter__("bar", set); |
| 414 |
| 415 |
| 416 // Redefine back to data property |
| 417 Object.defineProperty(obj3, "bar", dataConfigurable); |
| 418 desc = Object.getOwnPropertyDescriptor(obj3, "bar"); |
| 419 assertEquals(obj3.bar, 1000); |
| 420 assertEquals(desc.value, 1000); |
| 421 assertTrue(desc.configurable); |
| 422 assertFalse(desc.writable); |
| 423 assertTrue(desc.enumerable); |
| 424 assertEquals(desc.get, undefined); |
| 425 assertEquals(desc.set, undefined); |
| 426 |
| 427 |
| 428 var obj4 = {}; |
| 429 var func = function (){return 42;}; |
| 430 obj4.bar = func; |
| 431 assertEquals(42, obj4.bar()); |
| 432 |
| 433 Object.defineProperty(obj4, "bar", accessorConfigurable); |
| 434 desc = Object.getOwnPropertyDescriptor(obj4, "bar"); |
| 435 assertTrue(desc.configurable); |
| 436 assertTrue(desc.enumerable); |
| 437 assertEquals(desc.writable, undefined); |
| 438 assertEquals(desc.get, accessorConfigurable.get); |
| 439 assertEquals(desc.set, accessorConfigurable.set); |
| 440 assertEquals(desc.value, undefined); |
| 441 assertEquals(1, obj4.bar = 1); |
| 442 assertEquals(5, val1); |
| 443 assertEquals(5, obj4.bar); |
| 444 |
| 445 // Make sure an error is thrown when trying to access to redefined function |
| 446 try { |
| 447 obj4.bar(); |
| 448 assertTrue(false); |
| 449 } catch (e) { |
| 450 assertTrue(/is not a function/.test(e)); |
| 451 } |
| 452 |
| 453 |
| 454 |
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