Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 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, extrasUtils) { |
| 6 | |
| 7 | "use strict"; |
| 8 | |
| 9 | %CheckIsBootstrapping(); |
| 10 | |
| 11 | // ------------------------------------------------------------------- |
| 12 | // Imports |
| 13 | |
| 14 | var InternalArray = utils.InternalArray; |
| 15 | var MakeTypeError; |
| 16 | var promiseCombinedDeferredSymbol = |
| 17 | utils.ImportNow("promise_combined_deferred_symbol"); |
| 18 | var promiseHasHandlerSymbol = |
| 19 | utils.ImportNow("promise_has_handler_symbol"); |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 20 | var promiseRejectReactionsSymbol = |
| 21 | utils.ImportNow("promise_reject_reactions_symbol"); |
| 22 | var promiseFulfillReactionsSymbol = |
| 23 | utils.ImportNow("promise_fulfill_reactions_symbol"); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 24 | var promiseRawSymbol = utils.ImportNow("promise_raw_symbol"); |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 25 | var promiseStateSymbol = utils.ImportNow("promise_state_symbol"); |
| 26 | var promiseResultSymbol = utils.ImportNow("promise_result_symbol"); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 27 | var SpeciesConstructor; |
| 28 | var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol"); |
| 29 | |
| 30 | utils.Import(function(from) { |
| 31 | MakeTypeError = from.MakeTypeError; |
| 32 | SpeciesConstructor = from.SpeciesConstructor; |
| 33 | }); |
| 34 | |
| 35 | // ------------------------------------------------------------------- |
| 36 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 37 | // [[PromiseState]] values: |
| 38 | const kPending = 0; |
| 39 | const kFulfilled = +1; |
| 40 | const kRejected = -1; |
| 41 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 42 | var lastMicrotaskId = 0; |
| 43 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 44 | // ES#sec-createresolvingfunctions |
| 45 | // CreateResolvingFunctions ( promise ) |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 46 | function CreateResolvingFunctions(promise) { |
| 47 | var alreadyResolved = false; |
| 48 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 49 | // ES#sec-promise-resolve-functions |
| 50 | // Promise Resolve Functions |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 51 | var resolve = value => { |
| 52 | if (alreadyResolved === true) return; |
| 53 | alreadyResolved = true; |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 54 | FulfillPromise(promise, value); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 55 | }; |
| 56 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 57 | // ES#sec-promise-reject-functions |
| 58 | // Promise Reject Functions |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 59 | var reject = reason => { |
| 60 | if (alreadyResolved === true) return; |
| 61 | alreadyResolved = true; |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 62 | RejectPromise(promise, reason); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 63 | }; |
| 64 | |
| 65 | return { |
| 66 | __proto__: null, |
| 67 | resolve: resolve, |
| 68 | reject: reject |
| 69 | }; |
| 70 | } |
| 71 | |
| 72 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 73 | // ES#sec-promise-executor |
| 74 | // Promise ( executor ) |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 75 | var GlobalPromise = function Promise(resolver) { |
| 76 | if (resolver === promiseRawSymbol) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 77 | return %_NewObject(GlobalPromise, new.target); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 78 | } |
| 79 | if (IS_UNDEFINED(new.target)) throw MakeTypeError(kNotAPromise, this); |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 80 | if (!IS_CALLABLE(resolver)) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 81 | throw MakeTypeError(kResolverNotAFunction, resolver); |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 82 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 83 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 84 | var promise = PromiseInit(%_NewObject(GlobalPromise, new.target)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 85 | var callbacks = CreateResolvingFunctions(promise); |
| 86 | |
| 87 | try { |
| 88 | %DebugPushPromise(promise, Promise); |
| 89 | resolver(callbacks.resolve, callbacks.reject); |
| 90 | } catch (e) { |
| 91 | %_Call(callbacks.reject, UNDEFINED, e); |
| 92 | } finally { |
| 93 | %DebugPopPromise(); |
| 94 | } |
| 95 | |
| 96 | return promise; |
| 97 | } |
| 98 | |
| 99 | // Core functionality. |
| 100 | |
| 101 | function PromiseSet(promise, status, value, onResolve, onReject) { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 102 | SET_PRIVATE(promise, promiseStateSymbol, status); |
| 103 | SET_PRIVATE(promise, promiseResultSymbol, value); |
| 104 | SET_PRIVATE(promise, promiseFulfillReactionsSymbol, onResolve); |
| 105 | SET_PRIVATE(promise, promiseRejectReactionsSymbol, onReject); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 106 | return promise; |
| 107 | } |
| 108 | |
| 109 | function PromiseCreateAndSet(status, value) { |
| 110 | var promise = new GlobalPromise(promiseRawSymbol); |
| 111 | // If debug is active, notify about the newly created promise first. |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 112 | if (DEBUG_IS_ACTIVE) PromiseSet(promise, kPending, UNDEFINED); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 113 | return PromiseSet(promise, status, value); |
| 114 | } |
| 115 | |
| 116 | function PromiseInit(promise) { |
| 117 | return PromiseSet( |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 118 | promise, kPending, UNDEFINED, new InternalArray, new InternalArray) |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 119 | } |
| 120 | |
| 121 | function PromiseDone(promise, status, value, promiseQueue) { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 122 | if (GET_PRIVATE(promise, promiseStateSymbol) === kPending) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 123 | var tasks = GET_PRIVATE(promise, promiseQueue); |
| 124 | if (tasks.length) PromiseEnqueue(value, tasks, status); |
| 125 | PromiseSet(promise, status, value); |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | function PromiseHandle(value, handler, deferred) { |
| 130 | try { |
| 131 | %DebugPushPromise(deferred.promise, PromiseHandle); |
| 132 | var result = handler(value); |
| 133 | deferred.resolve(result); |
| 134 | } catch (exception) { |
| 135 | try { deferred.reject(exception); } catch (e) { } |
| 136 | } finally { |
| 137 | %DebugPopPromise(); |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | function PromiseEnqueue(value, tasks, status) { |
| 142 | var id, name, instrumenting = DEBUG_IS_ACTIVE; |
| 143 | %EnqueueMicrotask(function() { |
| 144 | if (instrumenting) { |
| 145 | %DebugAsyncTaskEvent({ type: "willHandle", id: id, name: name }); |
| 146 | } |
| 147 | for (var i = 0; i < tasks.length; i += 2) { |
| 148 | PromiseHandle(value, tasks[i], tasks[i + 1]) |
| 149 | } |
| 150 | if (instrumenting) { |
| 151 | %DebugAsyncTaskEvent({ type: "didHandle", id: id, name: name }); |
| 152 | } |
| 153 | }); |
| 154 | if (instrumenting) { |
| 155 | id = ++lastMicrotaskId; |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 156 | name = status === kFulfilled ? "Promise.resolve" : "Promise.reject"; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 157 | %DebugAsyncTaskEvent({ type: "enqueue", id: id, name: name }); |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | function PromiseIdResolveHandler(x) { return x } |
| 162 | function PromiseIdRejectHandler(r) { throw r } |
| 163 | |
| 164 | function PromiseNopResolver() {} |
| 165 | |
| 166 | // ------------------------------------------------------------------- |
| 167 | // Define exported functions. |
| 168 | |
| 169 | // For bootstrapper. |
| 170 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 171 | // ES#sec-ispromise IsPromise ( x ) |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 172 | function IsPromise(x) { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 173 | return IS_RECEIVER(x) && HAS_DEFINED_PRIVATE(x, promiseStateSymbol); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 174 | } |
| 175 | |
| 176 | function PromiseCreate() { |
| 177 | return new GlobalPromise(PromiseNopResolver) |
| 178 | } |
| 179 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 180 | // ES#sec-fulfillpromise |
| 181 | // FulfillPromise ( promise, value) |
| 182 | function FulfillPromise(promise, x) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 183 | if (x === promise) { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 184 | return RejectPromise(promise, MakeTypeError(kPromiseCyclic, x)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 185 | } |
| 186 | if (IS_RECEIVER(x)) { |
| 187 | // 25.4.1.3.2 steps 8-12 |
| 188 | try { |
| 189 | var then = x.then; |
| 190 | } catch (e) { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 191 | return RejectPromise(promise, e); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 192 | } |
| 193 | if (IS_CALLABLE(then)) { |
| 194 | // PromiseResolveThenableJob |
| 195 | var id, name, instrumenting = DEBUG_IS_ACTIVE; |
| 196 | %EnqueueMicrotask(function() { |
| 197 | if (instrumenting) { |
| 198 | %DebugAsyncTaskEvent({ type: "willHandle", id: id, name: name }); |
| 199 | } |
| 200 | var callbacks = CreateResolvingFunctions(promise); |
| 201 | try { |
| 202 | %_Call(then, x, callbacks.resolve, callbacks.reject); |
| 203 | } catch (e) { |
| 204 | %_Call(callbacks.reject, UNDEFINED, e); |
| 205 | } |
| 206 | if (instrumenting) { |
| 207 | %DebugAsyncTaskEvent({ type: "didHandle", id: id, name: name }); |
| 208 | } |
| 209 | }); |
| 210 | if (instrumenting) { |
| 211 | id = ++lastMicrotaskId; |
| 212 | name = "PromseResolveThenableJob"; |
| 213 | %DebugAsyncTaskEvent({ type: "enqueue", id: id, name: name }); |
| 214 | } |
| 215 | return; |
| 216 | } |
| 217 | } |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 218 | PromiseDone(promise, kFulfilled, x, promiseFulfillReactionsSymbol); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 219 | } |
| 220 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 221 | // ES#sec-rejectpromise |
| 222 | // RejectPromise ( promise, reason ) |
| 223 | function RejectPromise(promise, r) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 224 | // Check promise status to confirm that this reject has an effect. |
| 225 | // Call runtime for callbacks to the debugger or for unhandled reject. |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 226 | if (GET_PRIVATE(promise, promiseStateSymbol) === kPending) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 227 | var debug_is_active = DEBUG_IS_ACTIVE; |
| 228 | if (debug_is_active || |
| 229 | !HAS_DEFINED_PRIVATE(promise, promiseHasHandlerSymbol)) { |
| 230 | %PromiseRejectEvent(promise, r, debug_is_active); |
| 231 | } |
| 232 | } |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 233 | PromiseDone(promise, kRejected, r, promiseRejectReactionsSymbol) |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 234 | } |
| 235 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 236 | // ES#sec-newpromisecapability |
| 237 | // NewPromiseCapability ( C ) |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 238 | function NewPromiseCapability(C) { |
| 239 | if (C === GlobalPromise) { |
| 240 | // Optimized case, avoid extra closure. |
| 241 | var promise = PromiseInit(new GlobalPromise(promiseRawSymbol)); |
| 242 | var callbacks = CreateResolvingFunctions(promise); |
| 243 | return { |
| 244 | promise: promise, |
| 245 | resolve: callbacks.resolve, |
| 246 | reject: callbacks.reject |
| 247 | }; |
| 248 | } |
| 249 | |
| 250 | var result = {promise: UNDEFINED, resolve: UNDEFINED, reject: UNDEFINED }; |
| 251 | result.promise = new C((resolve, reject) => { |
| 252 | if (!IS_UNDEFINED(result.resolve) || !IS_UNDEFINED(result.reject)) |
| 253 | throw MakeTypeError(kPromiseExecutorAlreadyInvoked); |
| 254 | result.resolve = resolve; |
| 255 | result.reject = reject; |
| 256 | }); |
| 257 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 258 | if (!IS_CALLABLE(result.resolve) || !IS_CALLABLE(result.reject)) |
| 259 | throw MakeTypeError(kPromiseNonCallable); |
| 260 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 261 | return result; |
| 262 | } |
| 263 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 264 | // Unspecified V8-specific legacy function |
| 265 | function PromiseDefer() { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 266 | %IncrementUseCounter(kPromiseDefer); |
| 267 | return NewPromiseCapability(this); |
| 268 | } |
| 269 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 270 | // Unspecified V8-specific legacy function |
| 271 | function PromiseAccept(x) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 272 | %IncrementUseCounter(kPromiseAccept); |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 273 | return %_Call(PromiseResolve, this, x); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 274 | } |
| 275 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 276 | // ES#sec-promise.reject |
| 277 | // Promise.reject ( x ) |
| 278 | function PromiseReject(r) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 279 | if (!IS_RECEIVER(this)) { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 280 | throw MakeTypeError(kCalledOnNonObject, PromiseResolve); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 281 | } |
| 282 | if (this === GlobalPromise) { |
| 283 | // Optimized case, avoid extra closure. |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 284 | var promise = PromiseCreateAndSet(kRejected, r); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 285 | // The debug event for this would always be an uncaught promise reject, |
| 286 | // which is usually simply noise. Do not trigger that debug event. |
| 287 | %PromiseRejectEvent(promise, r, false); |
| 288 | return promise; |
| 289 | } else { |
| 290 | var promiseCapability = NewPromiseCapability(this); |
| 291 | %_Call(promiseCapability.reject, UNDEFINED, r); |
| 292 | return promiseCapability.promise; |
| 293 | } |
| 294 | } |
| 295 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 296 | // Shortcut Promise.reject and Promise.resolve() implementations, used by |
| 297 | // Async Functions implementation. |
| 298 | function PromiseCreateRejected(r) { |
| 299 | return %_Call(PromiseReject, GlobalPromise, r); |
| 300 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 301 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 302 | function PromiseCreateResolved(x) { |
| 303 | return %_Call(PromiseResolve, GlobalPromise, x); |
| 304 | } |
| 305 | |
| 306 | // ES#sec-promise.prototype.then |
| 307 | // Promise.prototype.then ( onFulfilled, onRejected ) |
| 308 | // Multi-unwrapped chaining with thenable coercion. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 309 | function PromiseThen(onResolve, onReject) { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 310 | var status = GET_PRIVATE(this, promiseStateSymbol); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 311 | if (IS_UNDEFINED(status)) { |
| 312 | throw MakeTypeError(kNotAPromise, this); |
| 313 | } |
| 314 | |
| 315 | var constructor = SpeciesConstructor(this, GlobalPromise); |
| 316 | onResolve = IS_CALLABLE(onResolve) ? onResolve : PromiseIdResolveHandler; |
| 317 | onReject = IS_CALLABLE(onReject) ? onReject : PromiseIdRejectHandler; |
| 318 | var deferred = NewPromiseCapability(constructor); |
| 319 | switch (status) { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 320 | case kPending: |
| 321 | GET_PRIVATE(this, promiseFulfillReactionsSymbol).push(onResolve, |
| 322 | deferred); |
| 323 | GET_PRIVATE(this, promiseRejectReactionsSymbol).push(onReject, deferred); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 324 | break; |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 325 | case kFulfilled: |
| 326 | PromiseEnqueue(GET_PRIVATE(this, promiseResultSymbol), |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 327 | [onResolve, deferred], |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 328 | kFulfilled); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 329 | break; |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 330 | case kRejected: |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 331 | if (!HAS_DEFINED_PRIVATE(this, promiseHasHandlerSymbol)) { |
| 332 | // Promise has already been rejected, but had no handler. |
| 333 | // Revoke previously triggered reject event. |
| 334 | %PromiseRevokeReject(this); |
| 335 | } |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 336 | PromiseEnqueue(GET_PRIVATE(this, promiseResultSymbol), |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 337 | [onReject, deferred], |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 338 | kRejected); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 339 | break; |
| 340 | } |
| 341 | // Mark this promise as having handler. |
| 342 | SET_PRIVATE(this, promiseHasHandlerSymbol, true); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 343 | return deferred.promise; |
| 344 | } |
| 345 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 346 | // Unspecified V8-specific legacy function |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 347 | // Chain is left around for now as an alias for then |
| 348 | function PromiseChain(onResolve, onReject) { |
| 349 | %IncrementUseCounter(kPromiseChain); |
| 350 | return %_Call(PromiseThen, this, onResolve, onReject); |
| 351 | } |
| 352 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 353 | // ES#sec-promise.prototype.catch |
| 354 | // Promise.prototype.catch ( onRejected ) |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 355 | function PromiseCatch(onReject) { |
| 356 | return this.then(UNDEFINED, onReject); |
| 357 | } |
| 358 | |
| 359 | // Combinators. |
| 360 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 361 | // ES#sec-promise.resolve |
| 362 | // Promise.resolve ( x ) |
| 363 | function PromiseResolve(x) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 364 | if (!IS_RECEIVER(this)) { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 365 | throw MakeTypeError(kCalledOnNonObject, PromiseResolve); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 366 | } |
| 367 | if (IsPromise(x) && x.constructor === this) return x; |
| 368 | |
| 369 | var promiseCapability = NewPromiseCapability(this); |
| 370 | var resolveResult = %_Call(promiseCapability.resolve, UNDEFINED, x); |
| 371 | return promiseCapability.promise; |
| 372 | } |
| 373 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 374 | // ES#sec-promise.all |
| 375 | // Promise.all ( iterable ) |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 376 | function PromiseAll(iterable) { |
| 377 | if (!IS_RECEIVER(this)) { |
| 378 | throw MakeTypeError(kCalledOnNonObject, "Promise.all"); |
| 379 | } |
| 380 | |
| 381 | var deferred = NewPromiseCapability(this); |
| 382 | var resolutions = new InternalArray(); |
| 383 | var count; |
| 384 | |
| 385 | function CreateResolveElementFunction(index, values, promiseCapability) { |
| 386 | var alreadyCalled = false; |
| 387 | return (x) => { |
| 388 | if (alreadyCalled === true) return; |
| 389 | alreadyCalled = true; |
| 390 | values[index] = x; |
| 391 | if (--count === 0) { |
| 392 | var valuesArray = []; |
| 393 | %MoveArrayContents(values, valuesArray); |
| 394 | %_Call(promiseCapability.resolve, UNDEFINED, valuesArray); |
| 395 | } |
| 396 | }; |
| 397 | } |
| 398 | |
| 399 | try { |
| 400 | var i = 0; |
| 401 | count = 1; |
| 402 | for (var value of iterable) { |
| 403 | var nextPromise = this.resolve(value); |
| 404 | ++count; |
| 405 | nextPromise.then( |
| 406 | CreateResolveElementFunction(i, resolutions, deferred), |
| 407 | deferred.reject); |
| 408 | SET_PRIVATE(deferred.reject, promiseCombinedDeferredSymbol, deferred); |
| 409 | ++i; |
| 410 | } |
| 411 | |
| 412 | // 6.d |
| 413 | if (--count === 0) { |
| 414 | var valuesArray = []; |
| 415 | %MoveArrayContents(resolutions, valuesArray); |
| 416 | %_Call(deferred.resolve, UNDEFINED, valuesArray); |
| 417 | } |
| 418 | |
| 419 | } catch (e) { |
| 420 | %_Call(deferred.reject, UNDEFINED, e); |
| 421 | } |
| 422 | return deferred.promise; |
| 423 | } |
| 424 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 425 | // ES#sec-promise.race |
| 426 | // Promise.race ( iterable ) |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 427 | function PromiseRace(iterable) { |
| 428 | if (!IS_RECEIVER(this)) { |
| 429 | throw MakeTypeError(kCalledOnNonObject, PromiseRace); |
| 430 | } |
| 431 | |
| 432 | var deferred = NewPromiseCapability(this); |
| 433 | try { |
| 434 | for (var value of iterable) { |
| 435 | this.resolve(value).then(deferred.resolve, deferred.reject); |
| 436 | SET_PRIVATE(deferred.reject, promiseCombinedDeferredSymbol, deferred); |
| 437 | } |
| 438 | } catch (e) { |
| 439 | deferred.reject(e) |
| 440 | } |
| 441 | return deferred.promise; |
| 442 | } |
| 443 | |
| 444 | |
| 445 | // Utility for debugger |
| 446 | |
| 447 | function PromiseHasUserDefinedRejectHandlerRecursive(promise) { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 448 | var queue = GET_PRIVATE(promise, promiseRejectReactionsSymbol); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 449 | if (IS_UNDEFINED(queue)) return false; |
| 450 | for (var i = 0; i < queue.length; i += 2) { |
| 451 | var handler = queue[i]; |
| 452 | if (handler !== PromiseIdRejectHandler) { |
| 453 | var deferred = GET_PRIVATE(handler, promiseCombinedDeferredSymbol); |
| 454 | if (IS_UNDEFINED(deferred)) return true; |
| 455 | if (PromiseHasUserDefinedRejectHandlerRecursive(deferred.promise)) { |
| 456 | return true; |
| 457 | } |
| 458 | } else if (PromiseHasUserDefinedRejectHandlerRecursive( |
| 459 | queue[i + 1].promise)) { |
| 460 | return true; |
| 461 | } |
| 462 | } |
| 463 | return false; |
| 464 | } |
| 465 | |
| 466 | // Return whether the promise will be handled by a user-defined reject |
| 467 | // handler somewhere down the promise chain. For this, we do a depth-first |
| 468 | // search for a reject handler that's not the default PromiseIdRejectHandler. |
| 469 | function PromiseHasUserDefinedRejectHandler() { |
| 470 | return PromiseHasUserDefinedRejectHandlerRecursive(this); |
| 471 | }; |
| 472 | |
| 473 | // ------------------------------------------------------------------- |
| 474 | // Install exported functions. |
| 475 | |
| 476 | %AddNamedProperty(global, 'Promise', GlobalPromise, DONT_ENUM); |
| 477 | %AddNamedProperty(GlobalPromise.prototype, toStringTagSymbol, "Promise", |
| 478 | DONT_ENUM | READ_ONLY); |
| 479 | |
| 480 | utils.InstallFunctions(GlobalPromise, DONT_ENUM, [ |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 481 | "reject", PromiseReject, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 482 | "all", PromiseAll, |
| 483 | "race", PromiseRace, |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 484 | "resolve", PromiseResolve |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 485 | ]); |
| 486 | |
| 487 | utils.InstallFunctions(GlobalPromise.prototype, DONT_ENUM, [ |
| 488 | "then", PromiseThen, |
| 489 | "catch", PromiseCatch |
| 490 | ]); |
| 491 | |
| 492 | %InstallToContext([ |
| 493 | "promise_catch", PromiseCatch, |
| 494 | "promise_chain", PromiseChain, |
| 495 | "promise_create", PromiseCreate, |
| 496 | "promise_has_user_defined_reject_handler", PromiseHasUserDefinedRejectHandler, |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 497 | "promise_reject", RejectPromise, |
| 498 | "promise_resolve", FulfillPromise, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 499 | "promise_then", PromiseThen, |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 500 | "promise_create_rejected", PromiseCreateRejected, |
| 501 | "promise_create_resolved", PromiseCreateResolved |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 502 | ]); |
| 503 | |
| 504 | // This allows extras to create promises quickly without building extra |
| 505 | // resolve/reject closures, and allows them to later resolve and reject any |
| 506 | // promise without having to hold on to those closures forever. |
| 507 | utils.InstallFunctions(extrasUtils, 0, [ |
| 508 | "createPromise", PromiseCreate, |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 509 | "resolvePromise", FulfillPromise, |
| 510 | "rejectPromise", RejectPromise |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 511 | ]); |
| 512 | |
| 513 | // TODO(v8:4567): Allow experimental natives to remove function prototype |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 514 | [PromiseChain, PromiseDefer, PromiseAccept].forEach( |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 515 | fn => %FunctionRemovePrototype(fn)); |
| 516 | |
| 517 | utils.Export(function(to) { |
| 518 | to.PromiseChain = PromiseChain; |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 519 | to.PromiseDefer = PromiseDefer; |
| 520 | to.PromiseAccept = PromiseAccept; |
| 521 | |
| 522 | to.PromiseCreateRejected = PromiseCreateRejected; |
| 523 | to.PromiseCreateResolved = PromiseCreateResolved; |
| 524 | to.PromiseThen = PromiseThen; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 525 | }); |
| 526 | |
| 527 | }) |