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1 // Copyright 2012 the V8 project authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 "use strict"; | 5 "use strict"; |
6 | 6 |
7 // This file relies on the fact that the following declaration has been made | 7 // This file relies on the fact that the following declaration has been made |
8 // in runtime.js: | 8 // in runtime.js: |
9 // var $Object = global.Object | 9 // var $Object = global.Object |
10 // var $WeakMap = global.WeakMap | 10 // var $WeakMap = global.WeakMap |
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23 // mirror-debugger.js currently uses builtins.promiseStatus. It would be nice | 23 // mirror-debugger.js currently uses builtins.promiseStatus. It would be nice |
24 // if we could move these property names into the closure below. | 24 // if we could move these property names into the closure below. |
25 // TODO(jkummerow/rossberg/yangguo): Find a better solution. | 25 // TODO(jkummerow/rossberg/yangguo): Find a better solution. |
26 | 26 |
27 // Status values: 0 = pending, +1 = resolved, -1 = rejected | 27 // Status values: 0 = pending, +1 = resolved, -1 = rejected |
28 var promiseStatus = GLOBAL_PRIVATE("Promise#status"); | 28 var promiseStatus = GLOBAL_PRIVATE("Promise#status"); |
29 var promiseValue = GLOBAL_PRIVATE("Promise#value"); | 29 var promiseValue = GLOBAL_PRIVATE("Promise#value"); |
30 var promiseOnResolve = GLOBAL_PRIVATE("Promise#onResolve"); | 30 var promiseOnResolve = GLOBAL_PRIVATE("Promise#onResolve"); |
31 var promiseOnReject = GLOBAL_PRIVATE("Promise#onReject"); | 31 var promiseOnReject = GLOBAL_PRIVATE("Promise#onReject"); |
32 var promiseRaw = GLOBAL_PRIVATE("Promise#raw"); | 32 var promiseRaw = GLOBAL_PRIVATE("Promise#raw"); |
33 var promiseDebug = GLOBAL_PRIVATE("Promise#debug"); | 33 var promiseHasReject = GLOBAL_PRIVATE("Promise#hasReject"); |
34 var lastMicrotaskId = 0; | 34 var lastMicrotaskId = 0; |
35 | 35 |
36 (function() { | 36 (function() { |
37 | 37 |
38 var $Promise = function Promise(resolver) { | 38 var $Promise = function Promise(resolver) { |
39 if (resolver === promiseRaw) return; | 39 if (resolver === promiseRaw) return; |
40 if (!%_IsConstructCall()) throw MakeTypeError('not_a_promise', [this]); | 40 if (!%_IsConstructCall()) throw MakeTypeError('not_a_promise', [this]); |
41 if (!IS_SPEC_FUNCTION(resolver)) | 41 if (!IS_SPEC_FUNCTION(resolver)) |
42 throw MakeTypeError('resolver_not_a_function', [resolver]); | 42 throw MakeTypeError('resolver_not_a_function', [resolver]); |
43 var promise = PromiseInit(this); | 43 var promise = PromiseInit(this); |
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152 PromiseCreate = function PromiseCreate() { | 152 PromiseCreate = function PromiseCreate() { |
153 return new $Promise(PromiseNopResolver) | 153 return new $Promise(PromiseNopResolver) |
154 } | 154 } |
155 | 155 |
156 PromiseResolve = function PromiseResolve(promise, x) { | 156 PromiseResolve = function PromiseResolve(promise, x) { |
157 PromiseDone(promise, +1, x, promiseOnResolve) | 157 PromiseDone(promise, +1, x, promiseOnResolve) |
158 } | 158 } |
159 | 159 |
160 PromiseReject = function PromiseReject(promise, r) { | 160 PromiseReject = function PromiseReject(promise, r) { |
161 // Check promise status to confirm that this reject has an effect. | 161 // Check promise status to confirm that this reject has an effect. |
162 // Check promiseDebug property to avoid duplicate event. | 162 if (GET_PRIVATE(promise, promiseStatus) == 0) { |
163 if (DEBUG_IS_ACTIVE && | 163 %PromiseRejectEvent(promise, r); |
164 GET_PRIVATE(promise, promiseStatus) == 0 && | |
165 !HAS_DEFINED_PRIVATE(promise, promiseDebug)) { | |
166 %DebugPromiseRejectEvent(promise, r); | |
167 } | 164 } |
168 PromiseDone(promise, -1, r, promiseOnReject) | 165 PromiseDone(promise, -1, r, promiseOnReject) |
169 } | 166 } |
170 | 167 |
171 // Convenience. | 168 // Convenience. |
172 | 169 |
173 function PromiseDeferred() { | 170 function PromiseDeferred() { |
174 if (this === $Promise) { | 171 if (this === $Promise) { |
175 // Optimized case, avoid extra closure. | 172 // Optimized case, avoid extra closure. |
176 var promise = PromiseInit(new $Promise(promiseRaw)); | 173 var promise = PromiseInit(new $Promise(promiseRaw)); |
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206 return new this(function(resolve, reject) { reject(r) }); | 203 return new this(function(resolve, reject) { reject(r) }); |
207 } | 204 } |
208 } | 205 } |
209 | 206 |
210 // Simple chaining. | 207 // Simple chaining. |
211 | 208 |
212 PromiseChain = function PromiseChain(onResolve, onReject) { // a.k.a. | 209 PromiseChain = function PromiseChain(onResolve, onReject) { // a.k.a. |
213 // flatMap | 210 // flatMap |
214 onResolve = IS_UNDEFINED(onResolve) ? PromiseIdResolveHandler : onResolve; | 211 onResolve = IS_UNDEFINED(onResolve) ? PromiseIdResolveHandler : onResolve; |
215 onReject = IS_UNDEFINED(onReject) ? PromiseIdRejectHandler : onReject; | 212 onReject = IS_UNDEFINED(onReject) ? PromiseIdRejectHandler : onReject; |
| 213 if (onReject != PromiseIdRejectHandler) { |
| 214 // Mark this promise as having reject handler. |
| 215 SET_PRIVATE(this, promiseHasReject, true); |
| 216 } |
216 var deferred = %_CallFunction(this.constructor, PromiseDeferred); | 217 var deferred = %_CallFunction(this.constructor, PromiseDeferred); |
217 switch (GET_PRIVATE(this, promiseStatus)) { | 218 switch (GET_PRIVATE(this, promiseStatus)) { |
218 case UNDEFINED: | 219 case UNDEFINED: |
219 throw MakeTypeError('not_a_promise', [this]); | 220 throw MakeTypeError('not_a_promise', [this]); |
220 case 0: // Pending | 221 case 0: // Pending |
221 GET_PRIVATE(this, promiseOnResolve).push(onResolve, deferred); | 222 GET_PRIVATE(this, promiseOnResolve).push(onResolve, deferred); |
222 GET_PRIVATE(this, promiseOnReject).push(onReject, deferred); | 223 GET_PRIVATE(this, promiseOnReject).push(onReject, deferred); |
223 break; | 224 break; |
224 case +1: // Resolved | 225 case +1: // Resolved |
225 PromiseEnqueue(GET_PRIVATE(this, promiseValue), | 226 PromiseEnqueue(GET_PRIVATE(this, promiseValue), |
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319 } catch (e) { | 320 } catch (e) { |
320 deferred.reject(e) | 321 deferred.reject(e) |
321 } | 322 } |
322 return deferred.promise; | 323 return deferred.promise; |
323 } | 324 } |
324 | 325 |
325 | 326 |
326 // Utility for debugger | 327 // Utility for debugger |
327 | 328 |
328 function PromiseHasRejectHandlerRecursive(promise) { | 329 function PromiseHasRejectHandlerRecursive(promise) { |
| 330 if (GET_PRIVATE(promise, promiseHasReject)) return true; |
329 var queue = GET_PRIVATE(promise, promiseOnReject); | 331 var queue = GET_PRIVATE(promise, promiseOnReject); |
330 if (IS_UNDEFINED(queue)) return false; | 332 if (IS_UNDEFINED(queue)) return false; |
331 // Do a depth first search for a reject handler that's not | 333 // Do a depth first search for a promise that has been marked as having |
332 // the default PromiseIdRejectHandler. | 334 // a reject handler. |
333 for (var i = 0; i < queue.length; i += 2) { | 335 for (var i = 0; i < queue.length; i += 2) { |
334 if (queue[i] != PromiseIdRejectHandler) return true; | |
335 if (PromiseHasRejectHandlerRecursive(queue[i + 1].promise)) return true; | 336 if (PromiseHasRejectHandlerRecursive(queue[i + 1].promise)) return true; |
336 } | 337 } |
337 return false; | 338 return false; |
338 } | 339 } |
339 | 340 |
340 PromiseHasRejectHandler = function PromiseHasRejectHandler() { | 341 PromiseHasRejectHandler = function PromiseHasRejectHandler() { |
341 // Mark promise as already having triggered a reject event. | |
342 SET_PRIVATE(this, promiseDebug, true); | |
343 return PromiseHasRejectHandlerRecursive(this); | 342 return PromiseHasRejectHandlerRecursive(this); |
344 }; | 343 }; |
345 | 344 |
346 // ------------------------------------------------------------------- | 345 // ------------------------------------------------------------------- |
347 // Install exported functions. | 346 // Install exported functions. |
348 | 347 |
349 %CheckIsBootstrapping(); | 348 %CheckIsBootstrapping(); |
350 %AddNamedProperty(global, 'Promise', $Promise, DONT_ENUM); | 349 %AddNamedProperty(global, 'Promise', $Promise, DONT_ENUM); |
351 InstallFunctions($Promise, DONT_ENUM, [ | 350 InstallFunctions($Promise, DONT_ENUM, [ |
352 "defer", PromiseDeferred, | 351 "defer", PromiseDeferred, |
353 "accept", PromiseResolved, | 352 "accept", PromiseResolved, |
354 "reject", PromiseRejected, | 353 "reject", PromiseRejected, |
355 "all", PromiseAll, | 354 "all", PromiseAll, |
356 "race", PromiseOne, | 355 "race", PromiseOne, |
357 "resolve", PromiseCast | 356 "resolve", PromiseCast |
358 ]); | 357 ]); |
359 InstallFunctions($Promise.prototype, DONT_ENUM, [ | 358 InstallFunctions($Promise.prototype, DONT_ENUM, [ |
360 "chain", PromiseChain, | 359 "chain", PromiseChain, |
361 "then", PromiseThen, | 360 "then", PromiseThen, |
362 "catch", PromiseCatch | 361 "catch", PromiseCatch |
363 ]); | 362 ]); |
364 | 363 |
365 })(); | 364 })(); |
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