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| 1 // Copyright 2012 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 (function(global, utils) { | |
| 6 | |
| 7 "use strict"; | |
| 8 | |
| 9 %CheckIsBootstrapping(); | |
| 10 | |
| 11 // ------------------------------------------------------------------- | |
| 12 // Imports | |
| 13 | |
| 14 var GetHash; | |
| 15 var GlobalArray = global.Array; | |
| 16 var GlobalObject = global.Object; | |
| 17 var InternalArray = utils.InternalArray; | |
| 18 var MakeTypeError; | |
| 19 | |
| 20 utils.Import(function(from) { | |
| 21 GetHash = from.GetHash; | |
| 22 MakeTypeError = from.MakeTypeError; | |
| 23 }); | |
| 24 | |
| 25 // ------------------------------------------------------------------- | |
| 26 | |
| 27 // Overview: | |
| 28 // | |
| 29 // This file contains all of the routing and accounting for Object.observe. | |
| 30 // User code will interact with these mechanisms via the Object.observe APIs | |
| 31 // and, as a side effect of mutation objects which are observed. The V8 runtime | |
| 32 // (both C++ and JS) will interact with these mechanisms primarily by enqueuing | |
| 33 // proper change records for objects which were mutated. The Object.observe | |
| 34 // routing and accounting consists primarily of three participants | |
| 35 // | |
| 36 // 1) ObjectInfo. This represents the observed state of a given object. It | |
| 37 // records what callbacks are observing the object, with what options, and | |
| 38 // what "change types" are in progress on the object (i.e. via | |
| 39 // notifier.performChange). | |
| 40 // | |
| 41 // 2) CallbackInfo. This represents a callback used for observation. It holds | |
| 42 // the records which must be delivered to the callback, as well as the global | |
| 43 // priority of the callback (which determines delivery order between | |
| 44 // callbacks). | |
| 45 // | |
| 46 // 3) observationState.pendingObservers. This is the set of observers which | |
| 47 // have change records which must be delivered. During "normal" delivery | |
| 48 // (i.e. not Object.deliverChangeRecords), this is the mechanism by which | |
| 49 // callbacks are invoked in the proper order until there are no more | |
| 50 // change records pending to a callback. | |
| 51 // | |
| 52 // Note that in order to reduce allocation and processing costs, the | |
| 53 // implementation of (1) and (2) have "optimized" states which represent | |
| 54 // common cases which can be handled more efficiently. | |
| 55 | |
| 56 var observationState; | |
| 57 | |
| 58 var notifierPrototype = {}; | |
| 59 | |
| 60 // We have to wait until after bootstrapping to grab a reference to the | |
| 61 // observationState object, since it's not possible to serialize that | |
| 62 // reference into the snapshot. | |
| 63 function GetObservationStateJS() { | |
| 64 if (IS_UNDEFINED(observationState)) { | |
| 65 observationState = %GetObservationState(); | |
| 66 } | |
| 67 | |
| 68 // TODO(adamk): Consider moving this code into heap.cc | |
| 69 if (IS_UNDEFINED(observationState.callbackInfoMap)) { | |
| 70 observationState.callbackInfoMap = %ObservationWeakMapCreate(); | |
| 71 observationState.objectInfoMap = %ObservationWeakMapCreate(); | |
| 72 observationState.notifierObjectInfoMap = %ObservationWeakMapCreate(); | |
| 73 observationState.pendingObservers = null; | |
| 74 observationState.nextCallbackPriority = 0; | |
| 75 observationState.lastMicrotaskId = 0; | |
| 76 } | |
| 77 | |
| 78 return observationState; | |
| 79 } | |
| 80 | |
| 81 | |
| 82 function GetPendingObservers() { | |
| 83 return GetObservationStateJS().pendingObservers; | |
| 84 } | |
| 85 | |
| 86 | |
| 87 function SetPendingObservers(pendingObservers) { | |
| 88 GetObservationStateJS().pendingObservers = pendingObservers; | |
| 89 } | |
| 90 | |
| 91 | |
| 92 function GetNextCallbackPriority() { | |
| 93 return GetObservationStateJS().nextCallbackPriority++; | |
| 94 } | |
| 95 | |
| 96 | |
| 97 function nullProtoObject() { | |
| 98 return { __proto__: null }; | |
| 99 } | |
| 100 | |
| 101 | |
| 102 function TypeMapCreate() { | |
| 103 return nullProtoObject(); | |
| 104 } | |
| 105 | |
| 106 | |
| 107 function TypeMapAddType(typeMap, type, ignoreDuplicate) { | |
| 108 typeMap[type] = ignoreDuplicate ? 1 : (typeMap[type] || 0) + 1; | |
| 109 } | |
| 110 | |
| 111 | |
| 112 function TypeMapRemoveType(typeMap, type) { | |
| 113 typeMap[type]--; | |
| 114 } | |
| 115 | |
| 116 | |
| 117 function TypeMapCreateFromList(typeList, length) { | |
| 118 var typeMap = TypeMapCreate(); | |
| 119 for (var i = 0; i < length; i++) { | |
| 120 TypeMapAddType(typeMap, typeList[i], true); | |
| 121 } | |
| 122 return typeMap; | |
| 123 } | |
| 124 | |
| 125 | |
| 126 function TypeMapHasType(typeMap, type) { | |
| 127 return !!typeMap[type]; | |
| 128 } | |
| 129 | |
| 130 | |
| 131 function TypeMapIsDisjointFrom(typeMap1, typeMap2) { | |
| 132 if (!typeMap1 || !typeMap2) | |
| 133 return true; | |
| 134 | |
| 135 for (var type in typeMap1) { | |
| 136 if (TypeMapHasType(typeMap1, type) && TypeMapHasType(typeMap2, type)) | |
| 137 return false; | |
| 138 } | |
| 139 | |
| 140 return true; | |
| 141 } | |
| 142 | |
| 143 | |
| 144 var defaultAcceptTypes = (function() { | |
| 145 var defaultTypes = [ | |
| 146 'add', | |
| 147 'update', | |
| 148 'delete', | |
| 149 'setPrototype', | |
| 150 'reconfigure', | |
| 151 'preventExtensions' | |
| 152 ]; | |
| 153 return TypeMapCreateFromList(defaultTypes, defaultTypes.length); | |
| 154 })(); | |
| 155 | |
| 156 | |
| 157 // An Observer is a registration to observe an object by a callback with | |
| 158 // a given set of accept types. If the set of accept types is the default | |
| 159 // set for Object.observe, the observer is represented as a direct reference | |
| 160 // to the callback. An observer never changes its accept types and thus never | |
| 161 // needs to "normalize". | |
| 162 function ObserverCreate(callback, acceptList) { | |
| 163 if (IS_UNDEFINED(acceptList)) | |
| 164 return callback; | |
| 165 var observer = nullProtoObject(); | |
| 166 observer.callback = callback; | |
| 167 observer.accept = acceptList; | |
| 168 return observer; | |
| 169 } | |
| 170 | |
| 171 | |
| 172 function ObserverGetCallback(observer) { | |
| 173 return IS_CALLABLE(observer) ? observer : observer.callback; | |
| 174 } | |
| 175 | |
| 176 | |
| 177 function ObserverGetAcceptTypes(observer) { | |
| 178 return IS_CALLABLE(observer) ? defaultAcceptTypes : observer.accept; | |
| 179 } | |
| 180 | |
| 181 | |
| 182 function ObserverIsActive(observer, objectInfo) { | |
| 183 return TypeMapIsDisjointFrom(ObjectInfoGetPerformingTypes(objectInfo), | |
| 184 ObserverGetAcceptTypes(observer)); | |
| 185 } | |
| 186 | |
| 187 | |
| 188 function ObjectInfoGetOrCreate(object) { | |
| 189 var objectInfo = ObjectInfoGet(object); | |
| 190 if (IS_UNDEFINED(objectInfo)) { | |
| 191 if (!IS_PROXY(object)) { | |
| 192 %SetIsObserved(object); | |
| 193 } | |
| 194 objectInfo = { | |
| 195 object: object, | |
| 196 changeObservers: null, | |
| 197 notifier: null, | |
| 198 performing: null, | |
| 199 performingCount: 0, | |
| 200 }; | |
| 201 %WeakCollectionSet(GetObservationStateJS().objectInfoMap, | |
| 202 object, objectInfo, GetHash(object)); | |
| 203 } | |
| 204 return objectInfo; | |
| 205 } | |
| 206 | |
| 207 | |
| 208 function ObjectInfoGet(object) { | |
| 209 return %WeakCollectionGet(GetObservationStateJS().objectInfoMap, object, | |
| 210 GetHash(object)); | |
| 211 } | |
| 212 | |
| 213 | |
| 214 function ObjectInfoGetFromNotifier(notifier) { | |
| 215 return %WeakCollectionGet(GetObservationStateJS().notifierObjectInfoMap, | |
| 216 notifier, GetHash(notifier)); | |
| 217 } | |
| 218 | |
| 219 | |
| 220 function ObjectInfoGetNotifier(objectInfo) { | |
| 221 if (IS_NULL(objectInfo.notifier)) { | |
| 222 var notifier = { __proto__: notifierPrototype }; | |
| 223 objectInfo.notifier = notifier; | |
| 224 %WeakCollectionSet(GetObservationStateJS().notifierObjectInfoMap, | |
| 225 notifier, objectInfo, GetHash(notifier)); | |
| 226 } | |
| 227 | |
| 228 return objectInfo.notifier; | |
| 229 } | |
| 230 | |
| 231 | |
| 232 function ChangeObserversIsOptimized(changeObservers) { | |
| 233 return IS_CALLABLE(changeObservers) || | |
| 234 IS_CALLABLE(changeObservers.callback); | |
| 235 } | |
| 236 | |
| 237 | |
| 238 // The set of observers on an object is called 'changeObservers'. The first | |
| 239 // observer is referenced directly via objectInfo.changeObservers. When a second | |
| 240 // is added, changeObservers "normalizes" to become a mapping of callback | |
| 241 // priority -> observer and is then stored on objectInfo.changeObservers. | |
| 242 function ObjectInfoNormalizeChangeObservers(objectInfo) { | |
| 243 if (ChangeObserversIsOptimized(objectInfo.changeObservers)) { | |
| 244 var observer = objectInfo.changeObservers; | |
| 245 var callback = ObserverGetCallback(observer); | |
| 246 var callbackInfo = CallbackInfoGet(callback); | |
| 247 var priority = CallbackInfoGetPriority(callbackInfo); | |
| 248 objectInfo.changeObservers = nullProtoObject(); | |
| 249 objectInfo.changeObservers[priority] = observer; | |
| 250 } | |
| 251 } | |
| 252 | |
| 253 | |
| 254 function ObjectInfoAddObserver(objectInfo, callback, acceptList) { | |
| 255 var callbackInfo = CallbackInfoGetOrCreate(callback); | |
| 256 var observer = ObserverCreate(callback, acceptList); | |
| 257 | |
| 258 if (!objectInfo.changeObservers) { | |
| 259 objectInfo.changeObservers = observer; | |
| 260 return; | |
| 261 } | |
| 262 | |
| 263 ObjectInfoNormalizeChangeObservers(objectInfo); | |
| 264 var priority = CallbackInfoGetPriority(callbackInfo); | |
| 265 objectInfo.changeObservers[priority] = observer; | |
| 266 } | |
| 267 | |
| 268 function ObjectInfoRemoveObserver(objectInfo, callback) { | |
| 269 if (!objectInfo.changeObservers) | |
| 270 return; | |
| 271 | |
| 272 if (ChangeObserversIsOptimized(objectInfo.changeObservers)) { | |
| 273 if (callback === ObserverGetCallback(objectInfo.changeObservers)) | |
| 274 objectInfo.changeObservers = null; | |
| 275 return; | |
| 276 } | |
| 277 | |
| 278 var callbackInfo = CallbackInfoGet(callback); | |
| 279 var priority = CallbackInfoGetPriority(callbackInfo); | |
| 280 objectInfo.changeObservers[priority] = null; | |
| 281 } | |
| 282 | |
| 283 function ObjectInfoHasActiveObservers(objectInfo) { | |
| 284 if (IS_UNDEFINED(objectInfo) || !objectInfo.changeObservers) | |
| 285 return false; | |
| 286 | |
| 287 if (ChangeObserversIsOptimized(objectInfo.changeObservers)) | |
| 288 return ObserverIsActive(objectInfo.changeObservers, objectInfo); | |
| 289 | |
| 290 for (var priority in objectInfo.changeObservers) { | |
| 291 var observer = objectInfo.changeObservers[priority]; | |
| 292 if (!IS_NULL(observer) && ObserverIsActive(observer, objectInfo)) | |
| 293 return true; | |
| 294 } | |
| 295 | |
| 296 return false; | |
| 297 } | |
| 298 | |
| 299 | |
| 300 function ObjectInfoAddPerformingType(objectInfo, type) { | |
| 301 objectInfo.performing = objectInfo.performing || TypeMapCreate(); | |
| 302 TypeMapAddType(objectInfo.performing, type); | |
| 303 objectInfo.performingCount++; | |
| 304 } | |
| 305 | |
| 306 | |
| 307 function ObjectInfoRemovePerformingType(objectInfo, type) { | |
| 308 objectInfo.performingCount--; | |
| 309 TypeMapRemoveType(objectInfo.performing, type); | |
| 310 } | |
| 311 | |
| 312 | |
| 313 function ObjectInfoGetPerformingTypes(objectInfo) { | |
| 314 return objectInfo.performingCount > 0 ? objectInfo.performing : null; | |
| 315 } | |
| 316 | |
| 317 | |
| 318 function ConvertAcceptListToTypeMap(arg) { | |
| 319 // We use undefined as a sentinel for the default accept list. | |
| 320 if (IS_UNDEFINED(arg)) | |
| 321 return arg; | |
| 322 | |
| 323 if (!IS_RECEIVER(arg)) throw MakeTypeError(kObserveInvalidAccept); | |
| 324 | |
| 325 var len = TO_INTEGER(arg.length); | |
| 326 if (len < 0) len = 0; | |
| 327 | |
| 328 return TypeMapCreateFromList(arg, len); | |
| 329 } | |
| 330 | |
| 331 | |
| 332 // CallbackInfo's optimized state is just a number which represents its global | |
| 333 // priority. When a change record must be enqueued for the callback, it | |
| 334 // normalizes. When delivery clears any pending change records, it re-optimizes. | |
| 335 function CallbackInfoGet(callback) { | |
| 336 return %WeakCollectionGet(GetObservationStateJS().callbackInfoMap, callback, | |
| 337 GetHash(callback)); | |
| 338 } | |
| 339 | |
| 340 | |
| 341 function CallbackInfoSet(callback, callbackInfo) { | |
| 342 %WeakCollectionSet(GetObservationStateJS().callbackInfoMap, | |
| 343 callback, callbackInfo, GetHash(callback)); | |
| 344 } | |
| 345 | |
| 346 | |
| 347 function CallbackInfoGetOrCreate(callback) { | |
| 348 var callbackInfo = CallbackInfoGet(callback); | |
| 349 if (!IS_UNDEFINED(callbackInfo)) | |
| 350 return callbackInfo; | |
| 351 | |
| 352 var priority = GetNextCallbackPriority(); | |
| 353 CallbackInfoSet(callback, priority); | |
| 354 return priority; | |
| 355 } | |
| 356 | |
| 357 | |
| 358 function CallbackInfoGetPriority(callbackInfo) { | |
| 359 if (IS_NUMBER(callbackInfo)) | |
| 360 return callbackInfo; | |
| 361 else | |
| 362 return callbackInfo.priority; | |
| 363 } | |
| 364 | |
| 365 | |
| 366 function CallbackInfoNormalize(callback) { | |
| 367 var callbackInfo = CallbackInfoGet(callback); | |
| 368 if (IS_NUMBER(callbackInfo)) { | |
| 369 var priority = callbackInfo; | |
| 370 callbackInfo = new InternalArray; | |
| 371 callbackInfo.priority = priority; | |
| 372 CallbackInfoSet(callback, callbackInfo); | |
| 373 } | |
| 374 return callbackInfo; | |
| 375 } | |
| 376 | |
| 377 | |
| 378 function ObjectObserve(object, callback, acceptList) { | |
| 379 if (!IS_RECEIVER(object)) | |
| 380 throw MakeTypeError(kObserveNonObject, "observe", "observe"); | |
| 381 if (%IsJSGlobalProxy(object)) | |
| 382 throw MakeTypeError(kObserveGlobalProxy, "observe"); | |
| 383 if (%IsAccessCheckNeeded(object)) | |
| 384 throw MakeTypeError(kObserveAccessChecked, "observe"); | |
| 385 if (!IS_CALLABLE(callback)) | |
| 386 throw MakeTypeError(kObserveNonFunction, "observe"); | |
| 387 if (%object_is_frozen(callback)) | |
| 388 throw MakeTypeError(kObserveCallbackFrozen); | |
| 389 | |
| 390 var objectObserveFn = %GetObjectContextObjectObserve(object); | |
| 391 return objectObserveFn(object, callback, acceptList); | |
| 392 } | |
| 393 | |
| 394 | |
| 395 function NativeObjectObserve(object, callback, acceptList) { | |
| 396 var objectInfo = ObjectInfoGetOrCreate(object); | |
| 397 var typeList = ConvertAcceptListToTypeMap(acceptList); | |
| 398 ObjectInfoAddObserver(objectInfo, callback, typeList); | |
| 399 return object; | |
| 400 } | |
| 401 | |
| 402 | |
| 403 function ObjectUnobserve(object, callback) { | |
| 404 if (!IS_RECEIVER(object)) | |
| 405 throw MakeTypeError(kObserveNonObject, "unobserve", "unobserve"); | |
| 406 if (%IsJSGlobalProxy(object)) | |
| 407 throw MakeTypeError(kObserveGlobalProxy, "unobserve"); | |
| 408 if (!IS_CALLABLE(callback)) | |
| 409 throw MakeTypeError(kObserveNonFunction, "unobserve"); | |
| 410 | |
| 411 var objectInfo = ObjectInfoGet(object); | |
| 412 if (IS_UNDEFINED(objectInfo)) | |
| 413 return object; | |
| 414 | |
| 415 ObjectInfoRemoveObserver(objectInfo, callback); | |
| 416 return object; | |
| 417 } | |
| 418 | |
| 419 | |
| 420 function ArrayObserve(object, callback) { | |
| 421 return ObjectObserve(object, callback, ['add', | |
| 422 'update', | |
| 423 'delete', | |
| 424 'splice']); | |
| 425 } | |
| 426 | |
| 427 | |
| 428 function ArrayUnobserve(object, callback) { | |
| 429 return ObjectUnobserve(object, callback); | |
| 430 } | |
| 431 | |
| 432 | |
| 433 function ObserverEnqueueIfActive(observer, objectInfo, changeRecord) { | |
| 434 if (!ObserverIsActive(observer, objectInfo) || | |
| 435 !TypeMapHasType(ObserverGetAcceptTypes(observer), changeRecord.type)) { | |
| 436 return; | |
| 437 } | |
| 438 | |
| 439 var callback = ObserverGetCallback(observer); | |
| 440 if (!%ObserverObjectAndRecordHaveSameOrigin(callback, changeRecord.object, | |
| 441 changeRecord)) { | |
| 442 return; | |
| 443 } | |
| 444 | |
| 445 var callbackInfo = CallbackInfoNormalize(callback); | |
| 446 if (IS_NULL(GetPendingObservers())) { | |
| 447 SetPendingObservers(nullProtoObject()); | |
| 448 if (DEBUG_IS_ACTIVE) { | |
| 449 var id = ++GetObservationStateJS().lastMicrotaskId; | |
| 450 var name = "Object.observe"; | |
| 451 %EnqueueMicrotask(function() { | |
| 452 %DebugAsyncTaskEvent({ type: "willHandle", id: id, name: name }); | |
| 453 ObserveMicrotaskRunner(); | |
| 454 %DebugAsyncTaskEvent({ type: "didHandle", id: id, name: name }); | |
| 455 }); | |
| 456 %DebugAsyncTaskEvent({ type: "enqueue", id: id, name: name }); | |
| 457 } else { | |
| 458 %EnqueueMicrotask(ObserveMicrotaskRunner); | |
| 459 } | |
| 460 } | |
| 461 GetPendingObservers()[callbackInfo.priority] = callback; | |
| 462 callbackInfo.push(changeRecord); | |
| 463 } | |
| 464 | |
| 465 | |
| 466 function ObjectInfoEnqueueExternalChangeRecord(objectInfo, changeRecord, type) { | |
| 467 if (!ObjectInfoHasActiveObservers(objectInfo)) | |
| 468 return; | |
| 469 | |
| 470 var hasType = !IS_UNDEFINED(type); | |
| 471 var newRecord = hasType ? | |
| 472 { object: objectInfo.object, type: type } : | |
| 473 { object: objectInfo.object }; | |
| 474 | |
| 475 for (var prop in changeRecord) { | |
| 476 if (prop === 'object' || (hasType && prop === 'type')) continue; | |
| 477 %DefineDataPropertyUnchecked( | |
| 478 newRecord, prop, changeRecord[prop], READ_ONLY + DONT_DELETE); | |
| 479 } | |
| 480 %object_freeze(newRecord); | |
| 481 | |
| 482 ObjectInfoEnqueueInternalChangeRecord(objectInfo, newRecord); | |
| 483 } | |
| 484 | |
| 485 | |
| 486 function ObjectInfoEnqueueInternalChangeRecord(objectInfo, changeRecord) { | |
| 487 // TODO(rossberg): adjust once there is a story for symbols vs proxies. | |
| 488 if (IS_SYMBOL(changeRecord.name)) return; | |
| 489 | |
| 490 if (ChangeObserversIsOptimized(objectInfo.changeObservers)) { | |
| 491 var observer = objectInfo.changeObservers; | |
| 492 ObserverEnqueueIfActive(observer, objectInfo, changeRecord); | |
| 493 return; | |
| 494 } | |
| 495 | |
| 496 for (var priority in objectInfo.changeObservers) { | |
| 497 var observer = objectInfo.changeObservers[priority]; | |
| 498 if (IS_NULL(observer)) | |
| 499 continue; | |
| 500 ObserverEnqueueIfActive(observer, objectInfo, changeRecord); | |
| 501 } | |
| 502 } | |
| 503 | |
| 504 | |
| 505 function BeginPerformSplice(array) { | |
| 506 var objectInfo = ObjectInfoGet(array); | |
| 507 if (!IS_UNDEFINED(objectInfo)) | |
| 508 ObjectInfoAddPerformingType(objectInfo, 'splice'); | |
| 509 } | |
| 510 | |
| 511 | |
| 512 function EndPerformSplice(array) { | |
| 513 var objectInfo = ObjectInfoGet(array); | |
| 514 if (!IS_UNDEFINED(objectInfo)) | |
| 515 ObjectInfoRemovePerformingType(objectInfo, 'splice'); | |
| 516 } | |
| 517 | |
| 518 | |
| 519 function EnqueueSpliceRecord(array, index, removed, addedCount) { | |
| 520 var objectInfo = ObjectInfoGet(array); | |
| 521 if (!ObjectInfoHasActiveObservers(objectInfo)) | |
| 522 return; | |
| 523 | |
| 524 var changeRecord = { | |
| 525 type: 'splice', | |
| 526 object: array, | |
| 527 index: index, | |
| 528 removed: removed, | |
| 529 addedCount: addedCount | |
| 530 }; | |
| 531 | |
| 532 %object_freeze(changeRecord); | |
| 533 %object_freeze(changeRecord.removed); | |
| 534 ObjectInfoEnqueueInternalChangeRecord(objectInfo, changeRecord); | |
| 535 } | |
| 536 | |
| 537 | |
| 538 function NotifyChange(type, object, name, oldValue) { | |
| 539 var objectInfo = ObjectInfoGet(object); | |
| 540 if (!ObjectInfoHasActiveObservers(objectInfo)) | |
| 541 return; | |
| 542 | |
| 543 var changeRecord; | |
| 544 if (arguments.length == 2) { | |
| 545 changeRecord = { type: type, object: object }; | |
| 546 } else if (arguments.length == 3) { | |
| 547 changeRecord = { type: type, object: object, name: name }; | |
| 548 } else { | |
| 549 changeRecord = { | |
| 550 type: type, | |
| 551 object: object, | |
| 552 name: name, | |
| 553 oldValue: oldValue | |
| 554 }; | |
| 555 } | |
| 556 | |
| 557 %object_freeze(changeRecord); | |
| 558 ObjectInfoEnqueueInternalChangeRecord(objectInfo, changeRecord); | |
| 559 } | |
| 560 | |
| 561 | |
| 562 function ObjectNotifierNotify(changeRecord) { | |
| 563 if (!IS_RECEIVER(this)) | |
| 564 throw MakeTypeError(kCalledOnNonObject, "notify"); | |
| 565 | |
| 566 var objectInfo = ObjectInfoGetFromNotifier(this); | |
| 567 if (IS_UNDEFINED(objectInfo)) | |
| 568 throw MakeTypeError(kObserveNotifyNonNotifier); | |
| 569 if (!IS_STRING(changeRecord.type)) | |
| 570 throw MakeTypeError(kObserveTypeNonString); | |
| 571 | |
| 572 ObjectInfoEnqueueExternalChangeRecord(objectInfo, changeRecord); | |
| 573 } | |
| 574 | |
| 575 | |
| 576 function ObjectNotifierPerformChange(changeType, changeFn) { | |
| 577 if (!IS_RECEIVER(this)) | |
| 578 throw MakeTypeError(kCalledOnNonObject, "performChange"); | |
| 579 | |
| 580 var objectInfo = ObjectInfoGetFromNotifier(this); | |
| 581 if (IS_UNDEFINED(objectInfo)) | |
| 582 throw MakeTypeError(kObserveNotifyNonNotifier); | |
| 583 if (!IS_STRING(changeType)) | |
| 584 throw MakeTypeError(kObservePerformNonString); | |
| 585 if (!IS_CALLABLE(changeFn)) | |
| 586 throw MakeTypeError(kObservePerformNonFunction); | |
| 587 | |
| 588 var performChangeFn = %GetObjectContextNotifierPerformChange(objectInfo); | |
| 589 performChangeFn(objectInfo, changeType, changeFn); | |
| 590 } | |
| 591 | |
| 592 | |
| 593 function NativeObjectNotifierPerformChange(objectInfo, changeType, changeFn) { | |
| 594 ObjectInfoAddPerformingType(objectInfo, changeType); | |
| 595 | |
| 596 var changeRecord; | |
| 597 try { | |
| 598 changeRecord = changeFn(); | |
| 599 } finally { | |
| 600 ObjectInfoRemovePerformingType(objectInfo, changeType); | |
| 601 } | |
| 602 | |
| 603 if (IS_RECEIVER(changeRecord)) | |
| 604 ObjectInfoEnqueueExternalChangeRecord(objectInfo, changeRecord, changeType); | |
| 605 } | |
| 606 | |
| 607 | |
| 608 function ObjectGetNotifier(object) { | |
| 609 if (!IS_RECEIVER(object)) | |
| 610 throw MakeTypeError(kObserveNonObject, "getNotifier", "getNotifier"); | |
| 611 if (%IsJSGlobalProxy(object)) | |
| 612 throw MakeTypeError(kObserveGlobalProxy, "getNotifier"); | |
| 613 if (%IsAccessCheckNeeded(object)) | |
| 614 throw MakeTypeError(kObserveAccessChecked, "getNotifier"); | |
| 615 | |
| 616 if (%object_is_frozen(object)) return null; | |
| 617 | |
| 618 if (!%ObjectWasCreatedInCurrentOrigin(object)) return null; | |
| 619 | |
| 620 var getNotifierFn = %GetObjectContextObjectGetNotifier(object); | |
| 621 return getNotifierFn(object); | |
| 622 } | |
| 623 | |
| 624 | |
| 625 function NativeObjectGetNotifier(object) { | |
| 626 var objectInfo = ObjectInfoGetOrCreate(object); | |
| 627 return ObjectInfoGetNotifier(objectInfo); | |
| 628 } | |
| 629 | |
| 630 | |
| 631 function CallbackDeliverPending(callback) { | |
| 632 var callbackInfo = CallbackInfoGet(callback); | |
| 633 if (IS_UNDEFINED(callbackInfo) || IS_NUMBER(callbackInfo)) | |
| 634 return false; | |
| 635 | |
| 636 // Clear the pending change records from callback and return it to its | |
| 637 // "optimized" state. | |
| 638 var priority = callbackInfo.priority; | |
| 639 CallbackInfoSet(callback, priority); | |
| 640 | |
| 641 var pendingObservers = GetPendingObservers(); | |
| 642 if (!IS_NULL(pendingObservers)) | |
| 643 delete pendingObservers[priority]; | |
| 644 | |
| 645 // TODO: combine the following runtime calls for perf optimization. | |
| 646 var delivered = []; | |
| 647 %MoveArrayContents(callbackInfo, delivered); | |
| 648 %DeliverObservationChangeRecords(callback, delivered); | |
| 649 | |
| 650 return true; | |
| 651 } | |
| 652 | |
| 653 | |
| 654 function ObjectDeliverChangeRecords(callback) { | |
| 655 if (!IS_CALLABLE(callback)) | |
| 656 throw MakeTypeError(kObserveNonFunction, "deliverChangeRecords"); | |
| 657 | |
| 658 while (CallbackDeliverPending(callback)) {} | |
| 659 } | |
| 660 | |
| 661 | |
| 662 function ObserveMicrotaskRunner() { | |
| 663 var pendingObservers = GetPendingObservers(); | |
| 664 if (!IS_NULL(pendingObservers)) { | |
| 665 SetPendingObservers(null); | |
| 666 for (var i in pendingObservers) { | |
| 667 CallbackDeliverPending(pendingObservers[i]); | |
| 668 } | |
| 669 } | |
| 670 } | |
| 671 | |
| 672 // ------------------------------------------------------------------- | |
| 673 | |
| 674 utils.InstallFunctions(notifierPrototype, DONT_ENUM, [ | |
| 675 "notify", ObjectNotifierNotify, | |
| 676 "performChange", ObjectNotifierPerformChange | |
| 677 ]); | |
| 678 | |
| 679 var ObserveObjectMethods = [ | |
| 680 "deliverChangeRecords", ObjectDeliverChangeRecords, | |
| 681 "getNotifier", ObjectGetNotifier, | |
| 682 "observe", ObjectObserve, | |
| 683 "unobserve", ObjectUnobserve | |
| 684 ]; | |
| 685 | |
| 686 var ObserveArrayMethods = [ | |
| 687 "observe", ArrayObserve, | |
| 688 "unobserve", ArrayUnobserve | |
| 689 ]; | |
| 690 | |
| 691 // TODO(adamk): Figure out why this prototype removal has to | |
| 692 // happen as part of initial snapshotting. | |
| 693 var removePrototypeFn = function(f, i) { | |
| 694 if (i % 2 === 1) %FunctionRemovePrototype(f); | |
| 695 }; | |
| 696 ObserveObjectMethods.forEach(removePrototypeFn); | |
| 697 ObserveArrayMethods.forEach(removePrototypeFn); | |
| 698 | |
| 699 %InstallToContext([ | |
| 700 "native_object_get_notifier", NativeObjectGetNotifier, | |
| 701 "native_object_notifier_perform_change", NativeObjectNotifierPerformChange, | |
| 702 "native_object_observe", NativeObjectObserve, | |
| 703 "observers_begin_perform_splice", BeginPerformSplice, | |
| 704 "observers_end_perform_splice", EndPerformSplice, | |
| 705 "observers_enqueue_splice", EnqueueSpliceRecord, | |
| 706 "observers_notify_change", NotifyChange, | |
| 707 ]); | |
| 708 | |
| 709 utils.Export(function(to) { | |
| 710 to.ObserveArrayMethods = ObserveArrayMethods; | |
| 711 to.ObserveBeginPerformSplice = BeginPerformSplice; | |
| 712 to.ObserveEndPerformSplice = EndPerformSplice; | |
| 713 to.ObserveEnqueueSpliceRecord = EnqueueSpliceRecord; | |
| 714 to.ObserveObjectMethods = ObserveObjectMethods; | |
| 715 }); | |
| 716 | |
| 717 }) | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1909433003:
Remove support for Object.observe (Closed)
Base URL: https://chromium.googlesource.com/v8/v8.git@master