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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 }) | |
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