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| 1 // Copyright 2014 the V8 project authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 // Flags: --harmony-unscopables |
| 6 // Flags: --harmony-collections |
| 7 |
| 8 var global = this; |
| 9 var globalProto = Object.getPrototypeOf(global); |
| 10 |
| 11 // Number of objects being tested. There is an assert ensuring this is correct. |
| 12 var objectCount = 21; |
| 13 |
| 14 |
| 15 function runTest(f) { |
| 16 function restore(object, oldProto) { |
| 17 delete object[Symbol.unscopables]; |
| 18 delete object.x; |
| 19 delete object.x_; |
| 20 delete object.y; |
| 21 delete object.z; |
| 22 Object.setPrototypeOf(object, oldProto); |
| 23 } |
| 24 |
| 25 function getObject(i) { |
| 26 var objects = [ |
| 27 {}, |
| 28 [], |
| 29 function() {}, |
| 30 function() { |
| 31 return arguments; |
| 32 }(), |
| 33 function() { |
| 34 'use strict'; |
| 35 return arguments; |
| 36 }(), |
| 37 Object(1), |
| 38 Object(true), |
| 39 Object('bla'), |
| 40 new Date, |
| 41 new RegExp, |
| 42 new Set, |
| 43 new Map, |
| 44 new WeakMap, |
| 45 new WeakSet, |
| 46 new ArrayBuffer(10), |
| 47 new Int32Array(5), |
| 48 Object, |
| 49 Function, |
| 50 Date, |
| 51 RegExp, |
| 52 global |
| 53 ]; |
| 54 |
| 55 assertEquals(objectCount, objects.length); |
| 56 return objects[i]; |
| 57 } |
| 58 |
| 59 // Tests depends on this not being there to start with. |
| 60 delete Array.prototype[Symbol.unscopables]; |
| 61 |
| 62 if (f.length === 1) { |
| 63 for (var i = 0; i < objectCount; i++) { |
| 64 var object = getObject(i); |
| 65 var oldObjectProto = Object.getPrototypeOf(object); |
| 66 f(object); |
| 67 restore(object, oldObjectProto); |
| 68 } |
| 69 } else { |
| 70 for (var i = 0; i < objectCount; i++) { |
| 71 for (var j = 0; j < objectCount; j++) { |
| 72 var object = getObject(i); |
| 73 var proto = getObject(j); |
| 74 if (object === proto) { |
| 75 continue; |
| 76 } |
| 77 var oldObjectProto = Object.getPrototypeOf(object); |
| 78 var oldProtoProto = Object.getPrototypeOf(proto); |
| 79 f(object, proto); |
| 80 restore(object, oldObjectProto); |
| 81 restore(proto, oldProtoProto); |
| 82 } |
| 83 } |
| 84 } |
| 85 } |
| 86 |
| 87 // Test array first, since other tests are changing |
| 88 // Array.prototype[Symbol.unscopables]. |
| 89 function TestArrayPrototypeUnscopables() { |
| 90 var descr = Object.getOwnPropertyDescriptor(Array.prototype, |
| 91 Symbol.unscopables); |
| 92 assertFalse(descr.enumerable); |
| 93 assertFalse(descr.writable); |
| 94 assertTrue(descr.configurable); |
| 95 assertEquals(null, Object.getPrototypeOf(descr.value)); |
| 96 |
| 97 var copyWithin = 'local copyWithin'; |
| 98 var entries = 'local entries'; |
| 99 var fill = 'local fill'; |
| 100 var find = 'local find'; |
| 101 var findIndex = 'local findIndex'; |
| 102 var keys = 'local keys'; |
| 103 var values = 'local values'; |
| 104 |
| 105 var array = []; |
| 106 array.toString = 42; |
| 107 |
| 108 with (array) { |
| 109 assertEquals('local copyWithin', copyWithin); |
| 110 assertEquals('local entries', entries); |
| 111 assertEquals('local fill', fill); |
| 112 assertEquals('local find', find); |
| 113 assertEquals('local findIndex', findIndex); |
| 114 assertEquals('local keys', keys); |
| 115 assertEquals('local values', values); |
| 116 assertEquals(42, toString); |
| 117 } |
| 118 } |
| 119 TestArrayPrototypeUnscopables(); |
| 120 |
| 121 |
| 122 |
| 123 function TestBasics(object) { |
| 124 var x = 1; |
| 125 var y = 2; |
| 126 var z = 3; |
| 127 object.x = 4; |
| 128 object.y = 5; |
| 129 |
| 130 with (object) { |
| 131 assertEquals(4, x); |
| 132 assertEquals(5, y); |
| 133 assertEquals(3, z); |
| 134 } |
| 135 |
| 136 object[Symbol.unscopables] = {x: true}; |
| 137 with (object) { |
| 138 assertEquals(1, x); |
| 139 assertEquals(5, y); |
| 140 assertEquals(3, z); |
| 141 } |
| 142 |
| 143 object[Symbol.unscopables] = {x: 0, y: true}; |
| 144 with (object) { |
| 145 assertEquals(1, x); |
| 146 assertEquals(2, y); |
| 147 assertEquals(3, z); |
| 148 } |
| 149 } |
| 150 runTest(TestBasics); |
| 151 |
| 152 |
| 153 function TestUnscopableChain(object) { |
| 154 var x = 1; |
| 155 object.x = 2; |
| 156 |
| 157 with (object) { |
| 158 assertEquals(2, x); |
| 159 } |
| 160 |
| 161 object[Symbol.unscopables] = { |
| 162 __proto__: {x: true} |
| 163 }; |
| 164 with (object) { |
| 165 assertEquals(1, x); |
| 166 } |
| 167 } |
| 168 runTest(TestUnscopableChain); |
| 169 |
| 170 |
| 171 function TestBasicsSet(object) { |
| 172 var x = 1; |
| 173 object.x = 2; |
| 174 |
| 175 with (object) { |
| 176 assertEquals(2, x); |
| 177 } |
| 178 |
| 179 object[Symbol.unscopables] = {x: true}; |
| 180 with (object) { |
| 181 assertEquals(1, x); |
| 182 x = 3; |
| 183 assertEquals(3, x); |
| 184 } |
| 185 |
| 186 assertEquals(3, x); |
| 187 assertEquals(2, object.x); |
| 188 } |
| 189 runTest(TestBasicsSet); |
| 190 |
| 191 |
| 192 function TestOnProto(object, proto) { |
| 193 var x = 1; |
| 194 var y = 2; |
| 195 var z = 3; |
| 196 proto.x = 4; |
| 197 |
| 198 Object.setPrototypeOf(object, proto); |
| 199 object.y = 5; |
| 200 |
| 201 with (object) { |
| 202 assertEquals(4, x); |
| 203 assertEquals(5, y); |
| 204 assertEquals(3, z); |
| 205 } |
| 206 |
| 207 proto[Symbol.unscopables] = {x: true}; |
| 208 with (object) { |
| 209 assertEquals(1, x); |
| 210 assertEquals(5, y); |
| 211 assertEquals(3, z); |
| 212 } |
| 213 |
| 214 object[Symbol.unscopables] = {y: true}; |
| 215 with (object) { |
| 216 assertEquals(4, x); |
| 217 assertEquals(2, y); |
| 218 assertEquals(3, z); |
| 219 } |
| 220 |
| 221 proto[Symbol.unscopables] = {y: true}; |
| 222 object[Symbol.unscopables] = {x: true}; |
| 223 with (object) { |
| 224 assertEquals(1, x); |
| 225 assertEquals(5, y); |
| 226 assertEquals(3, z); |
| 227 } |
| 228 } |
| 229 runTest(TestOnProto); |
| 230 |
| 231 |
| 232 function TestSetBlockedOnProto(object, proto) { |
| 233 var x = 1; |
| 234 object.x = 2; |
| 235 |
| 236 with (object) { |
| 237 assertEquals(2, x); |
| 238 } |
| 239 |
| 240 Object.setPrototypeOf(object, proto); |
| 241 proto[Symbol.unscopables] = {x: true}; |
| 242 with (object) { |
| 243 assertEquals(1, x); |
| 244 x = 3; |
| 245 assertEquals(3, x); |
| 246 } |
| 247 |
| 248 assertEquals(3, x); |
| 249 assertEquals(2, object.x); |
| 250 } |
| 251 runTest(TestSetBlockedOnProto); |
| 252 |
| 253 |
| 254 function TestNonObject(object) { |
| 255 var x = 1; |
| 256 var y = 2; |
| 257 object.x = 3; |
| 258 object.y = 4; |
| 259 |
| 260 object[Symbol.unscopables] = 'xy'; |
| 261 with (object) { |
| 262 assertEquals(3, x); |
| 263 assertEquals(4, y); |
| 264 } |
| 265 |
| 266 object[Symbol.unscopables] = null; |
| 267 with (object) { |
| 268 assertEquals(3, x); |
| 269 assertEquals(4, y); |
| 270 } |
| 271 } |
| 272 runTest(TestNonObject); |
| 273 |
| 274 |
| 275 function TestChangeDuringWith(object) { |
| 276 var x = 1; |
| 277 var y = 2; |
| 278 object.x = 3; |
| 279 object.y = 4; |
| 280 |
| 281 with (object) { |
| 282 assertEquals(3, x); |
| 283 assertEquals(4, y); |
| 284 object[Symbol.unscopables] = {x: true}; |
| 285 assertEquals(1, x); |
| 286 assertEquals(4, y); |
| 287 } |
| 288 } |
| 289 runTest(TestChangeDuringWith); |
| 290 |
| 291 |
| 292 function TestChangeDuringWithWithPossibleOptimization(object) { |
| 293 var x = 1; |
| 294 object.x = 2; |
| 295 with (object) { |
| 296 for (var i = 0; i < 1000; i++) { |
| 297 if (i === 500) object[Symbol.unscopables] = {x: true}; |
| 298 assertEquals(i < 500 ? 2: 1, x); |
| 299 } |
| 300 } |
| 301 } |
| 302 TestChangeDuringWithWithPossibleOptimization({}); |
| 303 |
| 304 |
| 305 function TestChangeDuringWithWithPossibleOptimization2(object) { |
| 306 var x = 1; |
| 307 object.x = 2; |
| 308 object[Symbol.unscopables] = {x: true}; |
| 309 with (object) { |
| 310 for (var i = 0; i < 1000; i++) { |
| 311 if (i === 500) delete object[Symbol.unscopables]; |
| 312 assertEquals(i < 500 ? 1 : 2, x); |
| 313 } |
| 314 } |
| 315 } |
| 316 TestChangeDuringWithWithPossibleOptimization2({}); |
| 317 |
| 318 |
| 319 function TestChangeDuringWithWithPossibleOptimization3(object) { |
| 320 var x = 1; |
| 321 object.x = 2; |
| 322 object[Symbol.unscopables] = {}; |
| 323 with (object) { |
| 324 for (var i = 0; i < 1000; i++) { |
| 325 if (i === 500) object[Symbol.unscopables].x = true; |
| 326 assertEquals(i < 500 ? 2 : 1, x); |
| 327 } |
| 328 } |
| 329 } |
| 330 TestChangeDuringWithWithPossibleOptimization3({}); |
| 331 |
| 332 |
| 333 function TestChangeDuringWithWithPossibleOptimization4(object) { |
| 334 var x = 1; |
| 335 object.x = 2; |
| 336 object[Symbol.unscopables] = {x: true}; |
| 337 with (object) { |
| 338 for (var i = 0; i < 1000; i++) { |
| 339 if (i === 500) delete object[Symbol.unscopables].x; |
| 340 assertEquals(i < 500 ? 1 : 2, x); |
| 341 } |
| 342 } |
| 343 } |
| 344 TestChangeDuringWithWithPossibleOptimization4({}); |
| 345 |
| 346 |
| 347 function TestAccessorReceiver(object, proto) { |
| 348 var x = 'local'; |
| 349 |
| 350 Object.defineProperty(proto, 'x', { |
| 351 get: function() { |
| 352 assertEquals(object, this); |
| 353 return this.x_; |
| 354 }, |
| 355 configurable: true |
| 356 }); |
| 357 proto.x_ = 'proto'; |
| 358 |
| 359 Object.setPrototypeOf(object, proto); |
| 360 proto.x_ = 'object'; |
| 361 |
| 362 with (object) { |
| 363 assertEquals('object', x); |
| 364 } |
| 365 } |
| 366 runTest(TestAccessorReceiver); |
| 367 |
| 368 |
| 369 function TestUnscopablesGetter(object) { |
| 370 // This test gets really messy when object is the global since the assert |
| 371 // functions are properties on the global object and the call count gets |
| 372 // completely different. |
| 373 if (object === global) return; |
| 374 |
| 375 var x = 'local'; |
| 376 object.x = 'object'; |
| 377 |
| 378 var callCount = 0; |
| 379 Object.defineProperty(object, Symbol.unscopables, { |
| 380 get: function() { |
| 381 callCount++; |
| 382 return {}; |
| 383 }, |
| 384 configurable: true |
| 385 }); |
| 386 with (object) { |
| 387 assertEquals('object', x); |
| 388 } |
| 389 // Once for HasBinding |
| 390 assertEquals(1, callCount); |
| 391 |
| 392 callCount = 0; |
| 393 Object.defineProperty(object, Symbol.unscopables, { |
| 394 get: function() { |
| 395 callCount++; |
| 396 return {x: true}; |
| 397 }, |
| 398 configurable: true |
| 399 }); |
| 400 with (object) { |
| 401 assertEquals('local', x); |
| 402 } |
| 403 // Once for HasBinding |
| 404 assertEquals(1, callCount); |
| 405 |
| 406 callCount = 0; |
| 407 Object.defineProperty(object, Symbol.unscopables, { |
| 408 get: function() { |
| 409 callCount++; |
| 410 return callCount == 1 ? {} : {x: true}; |
| 411 }, |
| 412 configurable: true |
| 413 }); |
| 414 with (object) { |
| 415 x = 1; |
| 416 } |
| 417 // Once for HasBinding |
| 418 assertEquals(1, callCount); |
| 419 assertEquals(1, object.x); |
| 420 assertEquals('local', x); |
| 421 with (object) { |
| 422 x = 2; |
| 423 } |
| 424 // One more HasBinding. |
| 425 assertEquals(2, callCount); |
| 426 assertEquals(1, object.x); |
| 427 assertEquals(2, x); |
| 428 } |
| 429 runTest(TestUnscopablesGetter); |
| 430 |
| 431 |
| 432 var global = this; |
| 433 function TestUnscopablesGetter2() { |
| 434 var x = 'local'; |
| 435 |
| 436 var globalProto = Object.getPrototypeOf(global); |
| 437 var protos = [{}, [], function() {}, global]; |
| 438 var objects = [{}, [], function() {}]; |
| 439 |
| 440 protos.forEach(function(proto) { |
| 441 objects.forEach(function(object) { |
| 442 Object.defineProperty(proto, 'x', { |
| 443 get: function() { |
| 444 assertEquals(object, this); |
| 445 return 'proto'; |
| 446 }, |
| 447 configurable: true |
| 448 }); |
| 449 |
| 450 object.__proto__ = proto; |
| 451 Object.defineProperty(object, 'x', { |
| 452 get: function() { |
| 453 assertEquals(object, this); |
| 454 return 'object'; |
| 455 }, |
| 456 configurable: true |
| 457 }); |
| 458 |
| 459 with (object) { |
| 460 assertEquals('object', x); |
| 461 } |
| 462 |
| 463 object[Symbol.unscopables] = {x: true}; |
| 464 with (object) { |
| 465 assertEquals('local', x); |
| 466 } |
| 467 |
| 468 delete proto[Symbol.unscopables]; |
| 469 delete object[Symbol.unscopables]; |
| 470 }); |
| 471 }); |
| 472 |
| 473 delete global.x; |
| 474 Object.setPrototypeOf(global, globalProto); |
| 475 } |
| 476 TestUnscopablesGetter2(); |
| 477 |
| 478 |
| 479 function TestSetterOnBlacklisted(object, proto) { |
| 480 var x = 'local'; |
| 481 Object.defineProperty(proto, 'x', { |
| 482 set: function(x) { |
| 483 assertUnreachable(); |
| 484 }, |
| 485 get: function() { |
| 486 return 'proto'; |
| 487 }, |
| 488 configurable: true |
| 489 }); |
| 490 Object.setPrototypeOf(object, proto); |
| 491 Object.defineProperty(object, 'x', { |
| 492 get: function() { |
| 493 return this.x_; |
| 494 }, |
| 495 set: function(x) { |
| 496 this.x_ = x; |
| 497 }, |
| 498 configurable: true |
| 499 }); |
| 500 object.x_ = 1; |
| 501 |
| 502 with (object) { |
| 503 x = 2; |
| 504 assertEquals(2, x); |
| 505 } |
| 506 |
| 507 assertEquals(2, object.x); |
| 508 |
| 509 object[Symbol.unscopables] = {x: true}; |
| 510 |
| 511 with (object) { |
| 512 x = 3; |
| 513 assertEquals(3, x); |
| 514 } |
| 515 |
| 516 assertEquals(2, object.x); |
| 517 } |
| 518 runTest(TestSetterOnBlacklisted); |
| 519 |
| 520 |
| 521 function TestObjectsAsUnscopables(object, unscopables) { |
| 522 var x = 1; |
| 523 object.x = 2; |
| 524 |
| 525 with (object) { |
| 526 assertEquals(2, x); |
| 527 object[Symbol.unscopables] = unscopables; |
| 528 assertEquals(2, x); |
| 529 } |
| 530 } |
| 531 runTest(TestObjectsAsUnscopables); |
| 532 |
| 533 |
| 534 function TestAccessorOnUnscopables(object) { |
| 535 var x = 1; |
| 536 object.x = 2; |
| 537 |
| 538 var unscopables = { |
| 539 get x() { |
| 540 assertUnreachable(); |
| 541 } |
| 542 }; |
| 543 |
| 544 with (object) { |
| 545 assertEquals(2, x); |
| 546 object[Symbol.unscopables] = unscopables; |
| 547 assertEquals(1, x); |
| 548 } |
| 549 } |
| 550 runTest(TestAccessorOnUnscopables); |
| 551 |
| 552 |
| 553 function TestLengthUnscopables(object, proto) { |
| 554 var length = 2; |
| 555 with (object) { |
| 556 assertEquals(1, length); |
| 557 object[Symbol.unscopables] = {length: true}; |
| 558 assertEquals(2, length); |
| 559 delete object[Symbol.unscopables]; |
| 560 assertEquals(1, length); |
| 561 } |
| 562 } |
| 563 TestLengthUnscopables([1], Array.prototype); |
| 564 TestLengthUnscopables(function(x) {}, Function.prototype); |
| 565 TestLengthUnscopables(new String('x'), String.prototype); |
| 566 |
| 567 |
| 568 function TestFunctionNameUnscopables(object) { |
| 569 var name = 'local'; |
| 570 with (object) { |
| 571 assertEquals('f', name); |
| 572 object[Symbol.unscopables] = {name: true}; |
| 573 assertEquals('local', name); |
| 574 delete object[Symbol.unscopables]; |
| 575 assertEquals('f', name); |
| 576 } |
| 577 } |
| 578 TestFunctionNameUnscopables(function f() {}); |
| 579 |
| 580 |
| 581 function TestFunctionPrototypeUnscopables() { |
| 582 var prototype = 'local'; |
| 583 var f = function() {}; |
| 584 var g = function() {}; |
| 585 Object.setPrototypeOf(f, g); |
| 586 var fp = f.prototype; |
| 587 var gp = g.prototype; |
| 588 with (f) { |
| 589 assertEquals(fp, prototype); |
| 590 f[Symbol.unscopables] = {prototype: true}; |
| 591 assertEquals('local', prototype); |
| 592 delete f[Symbol.unscopables]; |
| 593 assertEquals(fp, prototype); |
| 594 } |
| 595 } |
| 596 TestFunctionPrototypeUnscopables(function() {}); |
| 597 |
| 598 |
| 599 function TestFunctionArgumentsUnscopables() { |
| 600 var func = function() { |
| 601 var arguments = 'local'; |
| 602 var args = func.arguments; |
| 603 with (func) { |
| 604 assertEquals(args, arguments); |
| 605 func[Symbol.unscopables] = {arguments: true}; |
| 606 assertEquals('local', arguments); |
| 607 delete func[Symbol.unscopables]; |
| 608 assertEquals(args, arguments); |
| 609 } |
| 610 } |
| 611 func(1); |
| 612 } |
| 613 TestFunctionArgumentsUnscopables(); |
| 614 |
| 615 |
| 616 function TestArgumentsLengthUnscopables() { |
| 617 var func = function() { |
| 618 var length = 'local'; |
| 619 with (arguments) { |
| 620 assertEquals(1, length); |
| 621 arguments[Symbol.unscopables] = {length: true}; |
| 622 assertEquals('local', length); |
| 623 } |
| 624 } |
| 625 func(1); |
| 626 } |
| 627 TestArgumentsLengthUnscopables(); |
| 628 |
| 629 |
| 630 function TestFunctionCallerUnscopables() { |
| 631 var func = function() { |
| 632 var caller = 'local'; |
| 633 with (func) { |
| 634 assertEquals(TestFunctionCallerUnscopables, caller); |
| 635 func[Symbol.unscopables] = {caller: true}; |
| 636 assertEquals('local', caller); |
| 637 delete func[Symbol.unscopables]; |
| 638 assertEquals(TestFunctionCallerUnscopables, caller); |
| 639 } |
| 640 } |
| 641 func(1); |
| 642 } |
| 643 TestFunctionCallerUnscopables(); |
| 644 |
| 645 |
| 646 function TestGetUnscopablesGetterThrows() { |
| 647 var object = { |
| 648 get x() { |
| 649 assertUnreachable(); |
| 650 } |
| 651 }; |
| 652 function CustomError() {} |
| 653 Object.defineProperty(object, Symbol.unscopables, { |
| 654 get: function() { |
| 655 throw new CustomError(); |
| 656 } |
| 657 }); |
| 658 assertThrows(function() { |
| 659 with (object) { |
| 660 x; |
| 661 } |
| 662 }, CustomError); |
| 663 } |
| 664 TestGetUnscopablesGetterThrows(); |
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