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| 1 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file | |
| 2 // for details. All rights reserved. Use of this source code is governed by a | |
| 3 // BSD-style license that can be found in the LICENSE file. | |
| 4 | |
| 5 library _isolate_helper; | |
| 6 | |
| 7 import 'dart:async'; | |
| 8 import 'dart:collection' show Queue, HashMap; | |
| 9 import 'dart:isolate'; | |
| 10 import 'dart:_js_helper' show | |
| 11 Closure, | |
| 12 Null, | |
| 13 Primitives, | |
| 14 convertDartClosureToJS, | |
| 15 random64, | |
| 16 requiresPreamble; | |
| 17 import 'dart:_foreign_helper' show DART_CLOSURE_TO_JS, | |
| 18 JS, | |
| 19 JS_CREATE_ISOLATE, | |
| 20 JS_CURRENT_ISOLATE_CONTEXT, | |
| 21 JS_CURRENT_ISOLATE, | |
| 22 JS_SET_CURRENT_ISOLATE, | |
| 23 IsolateContext; | |
| 24 import 'dart:_interceptors' show JSExtendableArray; | |
| 25 | |
| 26 /** | |
| 27 * Called by the compiler to support switching | |
| 28 * between isolates when we get a callback from the DOM. | |
| 29 */ | |
| 30 _callInIsolate(_IsolateContext isolate, Function function) { | |
| 31 var result = isolate.eval(function); | |
| 32 _globalState.topEventLoop.run(); | |
| 33 return result; | |
| 34 } | |
| 35 | |
| 36 /// Marks entering a JavaScript async operation to keep the worker alive. | |
| 37 /// | |
| 38 /// To be called by library code before starting an async operation controlled | |
| 39 /// by the JavaScript event handler. | |
| 40 /// | |
| 41 /// Also call [leaveJsAsync] in all callback handlers marking the end of that | |
| 42 /// async operation (also error handlers) so the worker can be released. | |
| 43 /// | |
| 44 /// These functions only has to be called for code that can be run from a | |
| 45 /// worker-isolate (so not for general dom operations). | |
| 46 enterJsAsync() { | |
| 47 _globalState.topEventLoop._activeJsAsyncCount++; | |
| 48 } | |
| 49 | |
| 50 /// Marks leaving a javascript async operation. | |
| 51 /// | |
| 52 /// See [enterJsAsync]. | |
| 53 leaveJsAsync() { | |
| 54 _globalState.topEventLoop._activeJsAsyncCount--; | |
| 55 assert(_globalState.topEventLoop._activeJsAsyncCount >= 0); | |
| 56 } | |
| 57 | |
| 58 /// Returns true if we are currently in a worker context. | |
| 59 bool isWorker() => _globalState.isWorker; | |
| 60 | |
| 61 /** | |
| 62 * Called by the compiler to fetch the current isolate context. | |
| 63 */ | |
| 64 _IsolateContext _currentIsolate() => _globalState.currentContext; | |
| 65 | |
| 66 /** | |
| 67 * Wrapper that takes the dart entry point and runs it within an isolate. The | |
| 68 * dart2js compiler will inject a call of the form | |
| 69 * [: startRootIsolate(main); :] when it determines that this wrapping | |
| 70 * is needed. For single-isolate applications (e.g. hello world), this | |
| 71 * call is not emitted. | |
| 72 */ | |
| 73 void startRootIsolate(entry, args) { | |
| 74 // The dartMainRunner can inject a new arguments array. We pass the arguments | |
| 75 // through a "JS", so that the type-inferrer loses track of it. | |
| 76 args = JS("", "#", args); | |
| 77 if (args == null) args = []; | |
| 78 if (args is! List) { | |
| 79 throw new ArgumentError("Arguments to main must be a List: $args"); | |
| 80 } | |
| 81 _globalState = new _Manager(entry); | |
| 82 | |
| 83 // Don't start the main loop again, if we are in a worker. | |
| 84 if (_globalState.isWorker) return; | |
| 85 final rootContext = new _IsolateContext(); | |
| 86 _globalState.rootContext = rootContext; | |
| 87 | |
| 88 // BUG(5151491): Setting currentContext should not be necessary, but | |
| 89 // because closures passed to the DOM as event handlers do not bind their | |
| 90 // isolate automatically we try to give them a reasonable context to live in | |
| 91 // by having a "default" isolate (the first one created). | |
| 92 _globalState.currentContext = rootContext; | |
| 93 if (entry is _MainFunctionArgs) { | |
| 94 rootContext.eval(() { entry(args); }); | |
| 95 } else if (entry is _MainFunctionArgsMessage) { | |
| 96 rootContext.eval(() { entry(args, null); }); | |
| 97 } else { | |
| 98 rootContext.eval(entry); | |
| 99 } | |
| 100 _globalState.topEventLoop.run(); | |
| 101 } | |
| 102 | |
| 103 /******************************************************** | |
| 104 Inserted from lib/isolate/dart2js/isolateimpl.dart | |
| 105 ********************************************************/ | |
| 106 | |
| 107 /** | |
| 108 * Concepts used here: | |
| 109 * | |
| 110 * "manager" - A manager contains one or more isolates, schedules their | |
| 111 * execution, and performs other plumbing on their behalf. The isolate | |
| 112 * present at the creation of the manager is designated as its "root isolate". | |
| 113 * A manager may, for example, be implemented on a web Worker. | |
| 114 * | |
| 115 * [_Manager] - State present within a manager (exactly once, as a global). | |
| 116 * | |
| 117 * [_ManagerStub] - A handle held within one manager that allows interaction | |
| 118 * with another manager. A target manager may be addressed by zero or more | |
| 119 * [_ManagerStub]s. | |
| 120 * TODO(ahe): The _ManagerStub concept is broken. It was an attempt | |
| 121 * to create a common interface between the native Worker class and | |
| 122 * _MainManagerStub. | |
| 123 */ | |
| 124 | |
| 125 /** | |
| 126 * A native object that is shared across isolates. This object is visible to all | |
| 127 * isolates running under the same manager (either UI or background web worker). | |
| 128 * | |
| 129 * This is code that is intended to 'escape' the isolate boundaries in order to | |
| 130 * implement the semantics of isolates in JavaScript. Without this we would have | |
| 131 * been forced to implement more code (including the top-level event loop) in | |
| 132 * JavaScript itself. | |
| 133 */ | |
| 134 // TODO(eub, sigmund): move the "manager" to be entirely in JS. | |
| 135 // Running any Dart code outside the context of an isolate gives it | |
| 136 // the chance to break the isolate abstraction. | |
| 137 _Manager get _globalState => JS("_Manager", "init.globalState"); | |
| 138 | |
| 139 set _globalState(_Manager val) { | |
| 140 JS("void", "init.globalState = #", val); | |
| 141 } | |
| 142 | |
| 143 /** State associated with the current manager. See [globalState]. */ | |
| 144 // TODO(sigmund): split in multiple classes: global, thread, main-worker states? | |
| 145 class _Manager { | |
| 146 | |
| 147 /** Next available isolate id within this [_Manager]. */ | |
| 148 int nextIsolateId = 0; | |
| 149 | |
| 150 /** id assigned to this [_Manager]. */ | |
| 151 int currentManagerId = 0; | |
| 152 | |
| 153 /** | |
| 154 * Next available manager id. Only used by the main manager to assign a unique | |
| 155 * id to each manager created by it. | |
| 156 */ | |
| 157 int nextManagerId = 1; | |
| 158 | |
| 159 /** Context for the currently running [Isolate]. */ | |
| 160 _IsolateContext currentContext = null; | |
| 161 | |
| 162 /** Context for the root [Isolate] that first run in this [_Manager]. */ | |
| 163 _IsolateContext rootContext = null; | |
| 164 | |
| 165 /** The top-level event loop. */ | |
| 166 _EventLoop topEventLoop; | |
| 167 | |
| 168 /** Whether this program is running from the command line. */ | |
| 169 bool fromCommandLine; | |
| 170 | |
| 171 /** Whether this [_Manager] is running as a web worker. */ | |
| 172 bool isWorker; | |
| 173 | |
| 174 /** Whether we support spawning web workers. */ | |
| 175 bool supportsWorkers; | |
| 176 | |
| 177 /** | |
| 178 * Whether to use web workers when implementing isolates. Set to false for | |
| 179 * debugging/testing. | |
| 180 */ | |
| 181 bool get useWorkers => supportsWorkers; | |
| 182 | |
| 183 /** | |
| 184 * Whether to use the web-worker JSON-based message serialization protocol. By | |
| 185 * default this is only used with web workers. For debugging, you can force | |
| 186 * using this protocol by changing this field value to [:true:]. | |
| 187 */ | |
| 188 bool get needSerialization => useWorkers; | |
| 189 | |
| 190 /** | |
| 191 * Registry of isolates. Isolates must be registered if, and only if, receive | |
| 192 * ports are alive. Normally no open receive-ports means that the isolate is | |
| 193 * dead, but DOM callbacks could resurrect it. | |
| 194 */ | |
| 195 Map<int, _IsolateContext> isolates; | |
| 196 | |
| 197 /** Reference to the main [_Manager]. Null in the main [_Manager] itself. */ | |
| 198 _MainManagerStub mainManager; | |
| 199 | |
| 200 /// Registry of active Web Workers. Only used in the main [_Manager]. | |
| 201 Map<int, dynamic /* Worker */> managers; | |
| 202 | |
| 203 /** The entry point given by [startRootIsolate]. */ | |
| 204 final Function entry; | |
| 205 | |
| 206 _Manager(this.entry) { | |
| 207 _nativeDetectEnvironment(); | |
| 208 topEventLoop = new _EventLoop(); | |
| 209 isolates = new Map<int, _IsolateContext>(); | |
| 210 managers = new Map<int, dynamic>(); | |
| 211 if (isWorker) { // "if we are not the main manager ourself" is the intent. | |
| 212 mainManager = new _MainManagerStub(); | |
| 213 _nativeInitWorkerMessageHandler(); | |
| 214 } | |
| 215 } | |
| 216 | |
| 217 void _nativeDetectEnvironment() { | |
| 218 bool isWindowDefined = globalWindow != null; | |
| 219 bool isWorkerDefined = globalWorker != null; | |
| 220 | |
| 221 isWorker = !isWindowDefined && globalPostMessageDefined; | |
| 222 supportsWorkers = isWorker | |
| 223 || (isWorkerDefined && IsolateNatives.thisScript != null); | |
| 224 fromCommandLine = !isWindowDefined && !isWorker; | |
| 225 } | |
| 226 | |
| 227 void _nativeInitWorkerMessageHandler() { | |
| 228 var function = JS('', | |
| 229 "(function (f, a) { return function (e) { f(a, e); }})(#, #)", | |
| 230 DART_CLOSURE_TO_JS(IsolateNatives._processWorkerMessage), | |
| 231 mainManager); | |
| 232 JS("void", r"self.onmessage = #", function); | |
| 233 // We ensure dartPrint is defined so that the implementation of the Dart | |
| 234 // print method knows what to call. | |
| 235 JS('', '''self.dartPrint = self.dartPrint || (function(serialize) { | |
| 236 return function (object) { | |
| 237 if (self.console && self.console.log) { | |
| 238 self.console.log(object) | |
| 239 } else { | |
| 240 self.postMessage(serialize(object)); | |
| 241 } | |
| 242 } | |
| 243 })(#)''', DART_CLOSURE_TO_JS(_serializePrintMessage)); | |
| 244 } | |
| 245 | |
| 246 static _serializePrintMessage(object) { | |
| 247 return _serializeMessage({"command": "print", "msg": object}); | |
| 248 } | |
| 249 | |
| 250 /** | |
| 251 * Close the worker running this code if all isolates are done and | |
| 252 * there are no active async JavaScript tasks still running. | |
| 253 */ | |
| 254 void maybeCloseWorker() { | |
| 255 if (isWorker | |
| 256 && isolates.isEmpty | |
| 257 && topEventLoop._activeJsAsyncCount == 0) { | |
| 258 mainManager.postMessage(_serializeMessage({'command': 'close'})); | |
| 259 } | |
| 260 } | |
| 261 } | |
| 262 | |
| 263 /** Context information tracked for each isolate. */ | |
| 264 class _IsolateContext implements IsolateContext { | |
| 265 /** Current isolate id. */ | |
| 266 final int id = _globalState.nextIsolateId++; | |
| 267 | |
| 268 /** Registry of receive ports currently active on this isolate. */ | |
| 269 final Map<int, RawReceivePortImpl> ports = new Map<int, RawReceivePortImpl>(); | |
| 270 | |
| 271 /** Registry of weak receive ports currently active on this isolate. */ | |
| 272 final Set<int> weakPorts = new Set<int>(); | |
| 273 | |
| 274 /** Holds isolate globals (statics and top-level properties). */ | |
| 275 // native object containing all globals of an isolate. | |
| 276 final isolateStatics = JS_CREATE_ISOLATE(); | |
| 277 | |
| 278 final RawReceivePortImpl controlPort = new RawReceivePortImpl._controlPort(); | |
| 279 | |
| 280 final Capability pauseCapability = new Capability(); | |
| 281 final Capability terminateCapability = new Capability(); // License to kill. | |
| 282 | |
| 283 /// Boolean flag set when the initial method of the isolate has been executed. | |
| 284 /// | |
| 285 /// Used to avoid considering the isolate dead when it has no open | |
| 286 /// receive ports and no scheduled timers, because it hasn't had time to | |
| 287 /// create them yet. | |
| 288 bool initialized = false; | |
| 289 | |
| 290 // TODO(lrn): Store these in single "PauseState" object, so they don't take | |
| 291 // up as much room when not pausing. | |
| 292 bool isPaused = false; | |
| 293 List<_IsolateEvent> delayedEvents = []; | |
| 294 Set<Capability> pauseTokens = new Set(); | |
| 295 | |
| 296 // Container with the "on exit" handler send-ports. | |
| 297 var doneHandlers; | |
| 298 | |
| 299 /** | |
| 300 * Queue of functions to call when the current event is complete. | |
| 301 * | |
| 302 * These events are not just put at the front of the event queue, because | |
| 303 * they represent control messages, and should be handled even if the | |
| 304 * event queue is paused. | |
| 305 */ | |
| 306 var _scheduledControlEvents; | |
| 307 bool _isExecutingEvent = false; | |
| 308 | |
| 309 /** Whether uncaught errors are considered fatal. */ | |
| 310 bool errorsAreFatal = true; | |
| 311 | |
| 312 // Set of ports that listen to uncaught errors. | |
| 313 Set<SendPort> errorPorts = new Set(); | |
| 314 | |
| 315 _IsolateContext() { | |
| 316 this.registerWeak(controlPort._id, controlPort); | |
| 317 } | |
| 318 | |
| 319 void addPause(Capability authentification, Capability resume) { | |
| 320 if (pauseCapability != authentification) return; | |
| 321 if (pauseTokens.add(resume) && !isPaused) { | |
| 322 isPaused = true; | |
| 323 } | |
| 324 _updateGlobalState(); | |
| 325 } | |
| 326 | |
| 327 void removePause(Capability resume) { | |
| 328 if (!isPaused) return; | |
| 329 pauseTokens.remove(resume); | |
| 330 if (pauseTokens.isEmpty) { | |
| 331 while(delayedEvents.isNotEmpty) { | |
| 332 _IsolateEvent event = delayedEvents.removeLast(); | |
| 333 _globalState.topEventLoop.prequeue(event); | |
| 334 } | |
| 335 isPaused = false; | |
| 336 } | |
| 337 _updateGlobalState(); | |
| 338 } | |
| 339 | |
| 340 void addDoneListener(SendPort responsePort) { | |
| 341 if (doneHandlers == null) { | |
| 342 doneHandlers = []; | |
| 343 } | |
| 344 // If necessary, we can switch doneHandlers to a Set if it gets larger. | |
| 345 // That is not expected to happen in practice. | |
| 346 if (doneHandlers.contains(responsePort)) return; | |
| 347 doneHandlers.add(responsePort); | |
| 348 } | |
| 349 | |
| 350 void removeDoneListener(SendPort responsePort) { | |
| 351 if (doneHandlers == null) return; | |
| 352 doneHandlers.remove(responsePort); | |
| 353 } | |
| 354 | |
| 355 void setErrorsFatal(Capability authentification, bool errorsAreFatal) { | |
| 356 if (terminateCapability != authentification) return; | |
| 357 this.errorsAreFatal = errorsAreFatal; | |
| 358 } | |
| 359 | |
| 360 void handlePing(SendPort responsePort, int pingType) { | |
| 361 if (pingType == Isolate.IMMEDIATE || | |
| 362 (pingType == Isolate.BEFORE_NEXT_EVENT && | |
| 363 !_isExecutingEvent)) { | |
| 364 responsePort.send(null); | |
| 365 return; | |
| 366 } | |
| 367 void respond() { responsePort.send(null); } | |
| 368 if (pingType == Isolate.AS_EVENT) { | |
| 369 _globalState.topEventLoop.enqueue(this, respond, "ping"); | |
| 370 return; | |
| 371 } | |
| 372 assert(pingType == Isolate.BEFORE_NEXT_EVENT); | |
| 373 if (_scheduledControlEvents == null) { | |
| 374 _scheduledControlEvents = new Queue(); | |
| 375 } | |
| 376 _scheduledControlEvents.addLast(respond); | |
| 377 } | |
| 378 | |
| 379 void handleKill(Capability authentification, int priority) { | |
| 380 if (this.terminateCapability != authentification) return; | |
| 381 if (priority == Isolate.IMMEDIATE || | |
| 382 (priority == Isolate.BEFORE_NEXT_EVENT && | |
| 383 !_isExecutingEvent)) { | |
| 384 kill(); | |
| 385 return; | |
| 386 } | |
| 387 if (priority == Isolate.AS_EVENT) { | |
| 388 _globalState.topEventLoop.enqueue(this, kill, "kill"); | |
| 389 return; | |
| 390 } | |
| 391 assert(priority == Isolate.BEFORE_NEXT_EVENT); | |
| 392 if (_scheduledControlEvents == null) { | |
| 393 _scheduledControlEvents = new Queue(); | |
| 394 } | |
| 395 _scheduledControlEvents.addLast(kill); | |
| 396 } | |
| 397 | |
| 398 void addErrorListener(SendPort port) { | |
| 399 errorPorts.add(port); | |
| 400 } | |
| 401 | |
| 402 void removeErrorListener(SendPort port) { | |
| 403 errorPorts.remove(port); | |
| 404 } | |
| 405 | |
| 406 /** Function called with an uncaught error. */ | |
| 407 void handleUncaughtError(error, StackTrace stackTrace) { | |
| 408 // Just print the error if there is no error listener registered. | |
| 409 if (errorPorts.isEmpty) { | |
| 410 // An uncaught error in the root isolate will terminate the program? | |
| 411 if (errorsAreFatal && identical(this, _globalState.rootContext)) { | |
| 412 // The error will be rethrown to reach the global scope, so | |
| 413 // don't print it. | |
| 414 return; | |
| 415 } | |
| 416 if (JS('bool', 'self.console && self.console.error')) { | |
| 417 JS('void', 'self.console.error(#, #)', error, stackTrace); | |
| 418 } else { | |
| 419 print(error); | |
| 420 if (stackTrace != null) print(stackTrace); | |
| 421 } | |
| 422 return; | |
| 423 } | |
| 424 List message = new List(2) | |
| 425 ..[0] = error.toString() | |
| 426 ..[1] = (stackTrace == null) ? null : stackTrace.toString(); | |
| 427 for (SendPort port in errorPorts) port.send(message); | |
| 428 } | |
| 429 | |
| 430 /** | |
| 431 * Run [code] in the context of the isolate represented by [this]. | |
| 432 */ | |
| 433 dynamic eval(Function code) { | |
| 434 var old = _globalState.currentContext; | |
| 435 _globalState.currentContext = this; | |
| 436 this._setGlobals(); | |
| 437 var result = null; | |
| 438 _isExecutingEvent = true; | |
| 439 try { | |
| 440 result = code(); | |
| 441 } catch (e, s) { | |
| 442 handleUncaughtError(e, s); | |
| 443 if (errorsAreFatal) { | |
| 444 kill(); | |
| 445 // An uncaught error in the root context terminates all isolates. | |
| 446 if (identical(this, _globalState.rootContext)) { | |
| 447 rethrow; | |
| 448 } | |
| 449 } | |
| 450 } finally { | |
| 451 _isExecutingEvent = false; | |
| 452 _globalState.currentContext = old; | |
| 453 if (old != null) old._setGlobals(); | |
| 454 if (_scheduledControlEvents != null) { | |
| 455 while (_scheduledControlEvents.isNotEmpty) { | |
| 456 (_scheduledControlEvents.removeFirst())(); | |
| 457 } | |
| 458 } | |
| 459 } | |
| 460 return result; | |
| 461 } | |
| 462 | |
| 463 void _setGlobals() { | |
| 464 JS_SET_CURRENT_ISOLATE(isolateStatics); | |
| 465 } | |
| 466 | |
| 467 /** | |
| 468 * Handle messages comming in on the control port. | |
| 469 * | |
| 470 * These events do not go through the event queue. | |
| 471 * The `_globalState.currentContext` context is not set to this context | |
| 472 * during the handling. | |
| 473 */ | |
| 474 void handleControlMessage(message) { | |
| 475 switch (message[0]) { | |
| 476 case "pause": | |
| 477 addPause(message[1], message[2]); | |
| 478 break; | |
| 479 case "resume": | |
| 480 removePause(message[1]); | |
| 481 break; | |
| 482 case 'add-ondone': | |
| 483 addDoneListener(message[1]); | |
| 484 break; | |
| 485 case 'remove-ondone': | |
| 486 removeDoneListener(message[1]); | |
| 487 break; | |
| 488 case 'set-errors-fatal': | |
| 489 setErrorsFatal(message[1], message[2]); | |
| 490 break; | |
| 491 case "ping": | |
| 492 handlePing(message[1], message[2]); | |
| 493 break; | |
| 494 case "kill": | |
| 495 handleKill(message[1], message[2]); | |
| 496 break; | |
| 497 case "getErrors": | |
| 498 addErrorListener(message[1]); | |
| 499 break; | |
| 500 case "stopErrors": | |
| 501 removeErrorListener(message[1]); | |
| 502 break; | |
| 503 default: | |
| 504 } | |
| 505 } | |
| 506 | |
| 507 /** Looks up a port registered for this isolate. */ | |
| 508 RawReceivePortImpl lookup(int portId) => ports[portId]; | |
| 509 | |
| 510 void _addRegistration(int portId, RawReceivePortImpl port) { | |
| 511 if (ports.containsKey(portId)) { | |
| 512 throw new Exception("Registry: ports must be registered only once."); | |
| 513 } | |
| 514 ports[portId] = port; | |
| 515 } | |
| 516 | |
| 517 /** Registers a port on this isolate. */ | |
| 518 void register(int portId, RawReceivePortImpl port) { | |
| 519 _addRegistration(portId, port); | |
| 520 _updateGlobalState(); | |
| 521 } | |
| 522 | |
| 523 /** | |
| 524 * Registers a weak port on this isolate. | |
| 525 * | |
| 526 * The port does not keep the isolate active. | |
| 527 */ | |
| 528 void registerWeak(int portId, RawReceivePortImpl port) { | |
| 529 weakPorts.add(portId); | |
| 530 _addRegistration(portId, port); | |
| 531 } | |
| 532 | |
| 533 void _updateGlobalState() { | |
| 534 if (ports.length - weakPorts.length > 0 || isPaused || !initialized) { | |
| 535 _globalState.isolates[id] = this; // indicate this isolate is active | |
| 536 } else { | |
| 537 kill(); | |
| 538 } | |
| 539 } | |
| 540 | |
| 541 void kill() { | |
| 542 if (_scheduledControlEvents != null) { | |
| 543 // Kill all pending events. | |
| 544 _scheduledControlEvents.clear(); | |
| 545 } | |
| 546 // Stop listening on all ports. | |
| 547 // This should happen before sending events to done handlers, in case | |
| 548 // we are listening on ourselves. | |
| 549 // Closes all ports, including control port. | |
| 550 for (var port in ports.values) { | |
| 551 port._close(); | |
| 552 } | |
| 553 ports.clear(); | |
| 554 weakPorts.clear(); | |
| 555 _globalState.isolates.remove(id); // indicate this isolate is not active | |
| 556 errorPorts.clear(); | |
| 557 if (doneHandlers != null) { | |
| 558 for (SendPort port in doneHandlers) { | |
| 559 port.send(null); | |
| 560 } | |
| 561 doneHandlers = null; | |
| 562 } | |
| 563 } | |
| 564 | |
| 565 /** Unregister a port on this isolate. */ | |
| 566 void unregister(int portId) { | |
| 567 ports.remove(portId); | |
| 568 weakPorts.remove(portId); | |
| 569 _updateGlobalState(); | |
| 570 } | |
| 571 } | |
| 572 | |
| 573 /** Represent the event loop on a javascript thread (DOM or worker). */ | |
| 574 class _EventLoop { | |
| 575 final Queue<_IsolateEvent> events = new Queue<_IsolateEvent>(); | |
| 576 | |
| 577 /// The number of waiting callbacks not controlled by the dart event loop. | |
| 578 /// | |
| 579 /// This could be timers or http requests. The worker will only be killed if | |
| 580 /// this count reaches 0. | |
| 581 /// Access this by using [enterJsAsync] before starting a JavaScript async | |
| 582 /// operation and [leaveJsAsync] when the callback has fired. | |
| 583 int _activeJsAsyncCount = 0; | |
| 584 | |
| 585 _EventLoop(); | |
| 586 | |
| 587 void enqueue(isolate, fn, msg) { | |
| 588 events.addLast(new _IsolateEvent(isolate, fn, msg)); | |
| 589 } | |
| 590 | |
| 591 void prequeue(_IsolateEvent event) { | |
| 592 events.addFirst(event); | |
| 593 } | |
| 594 | |
| 595 _IsolateEvent dequeue() { | |
| 596 if (events.isEmpty) return null; | |
| 597 return events.removeFirst(); | |
| 598 } | |
| 599 | |
| 600 void checkOpenReceivePortsFromCommandLine() { | |
| 601 if (_globalState.rootContext != null | |
| 602 && _globalState.isolates.containsKey(_globalState.rootContext.id) | |
| 603 && _globalState.fromCommandLine | |
| 604 && _globalState.rootContext.ports.isEmpty) { | |
| 605 // We want to reach here only on the main [_Manager] and only | |
| 606 // on the command-line. In the browser the isolate might | |
| 607 // still be alive due to DOM callbacks, but the presumption is | |
| 608 // that on the command-line, no future events can be injected | |
| 609 // into the event queue once it's empty. Node has setTimeout | |
| 610 // so this presumption is incorrect there. We think(?) that | |
| 611 // in d8 this assumption is valid. | |
| 612 throw new Exception("Program exited with open ReceivePorts."); | |
| 613 } | |
| 614 } | |
| 615 | |
| 616 /** Process a single event, if any. */ | |
| 617 bool runIteration() { | |
| 618 final event = dequeue(); | |
| 619 if (event == null) { | |
| 620 checkOpenReceivePortsFromCommandLine(); | |
| 621 _globalState.maybeCloseWorker(); | |
| 622 return false; | |
| 623 } | |
| 624 event.process(); | |
| 625 return true; | |
| 626 } | |
| 627 | |
| 628 /** | |
| 629 * Runs multiple iterations of the run-loop. If possible, each iteration is | |
| 630 * run asynchronously. | |
| 631 */ | |
| 632 void _runHelper() { | |
| 633 if (globalWindow != null) { | |
| 634 // Run each iteration from the browser's top event loop. | |
| 635 void next() { | |
| 636 if (!runIteration()) return; | |
| 637 Timer.run(next); | |
| 638 } | |
| 639 next(); | |
| 640 } else { | |
| 641 // Run synchronously until no more iterations are available. | |
| 642 while (runIteration()) {} | |
| 643 } | |
| 644 } | |
| 645 | |
| 646 /** | |
| 647 * Call [_runHelper] but ensure that worker exceptions are propragated. | |
| 648 */ | |
| 649 void run() { | |
| 650 if (!_globalState.isWorker) { | |
| 651 _runHelper(); | |
| 652 } else { | |
| 653 try { | |
| 654 _runHelper(); | |
| 655 } catch (e, trace) { | |
| 656 _globalState.mainManager.postMessage(_serializeMessage( | |
| 657 {'command': 'error', 'msg': '$e\n$trace' })); | |
| 658 } | |
| 659 } | |
| 660 } | |
| 661 } | |
| 662 | |
| 663 /** An event in the top-level event queue. */ | |
| 664 class _IsolateEvent { | |
| 665 _IsolateContext isolate; | |
| 666 Function fn; | |
| 667 String message; | |
| 668 | |
| 669 _IsolateEvent(this.isolate, this.fn, this.message); | |
| 670 | |
| 671 void process() { | |
| 672 if (isolate.isPaused) { | |
| 673 isolate.delayedEvents.add(this); | |
| 674 return; | |
| 675 } | |
| 676 isolate.eval(fn); | |
| 677 } | |
| 678 } | |
| 679 | |
| 680 /** A stub for interacting with the main manager. */ | |
| 681 class _MainManagerStub { | |
| 682 void postMessage(msg) { | |
| 683 // "self" is a way to refer to the global context object that | |
| 684 // works in HTML pages and in Web Workers. It does not work in d8 | |
| 685 // and Firefox jsshell, because that would have been too easy. | |
| 686 // | |
| 687 // See: http://www.w3.org/TR/workers/#the-global-scope | |
| 688 // and: http://www.w3.org/TR/Window/#dfn-self-attribute | |
| 689 requiresPreamble(); | |
| 690 JS("void", r"self.postMessage(#)", msg); | |
| 691 } | |
| 692 } | |
| 693 | |
| 694 const String _SPAWNED_SIGNAL = "spawned"; | |
| 695 const String _SPAWN_FAILED_SIGNAL = "spawn failed"; | |
| 696 | |
| 697 get globalWindow { | |
| 698 requiresPreamble(); | |
| 699 return JS('', "self.window"); | |
| 700 } | |
| 701 | |
| 702 get globalWorker { | |
| 703 requiresPreamble(); | |
| 704 return JS('', "self.Worker"); | |
| 705 } | |
| 706 bool get globalPostMessageDefined { | |
| 707 requiresPreamble(); | |
| 708 return JS('bool', "!!self.postMessage"); | |
| 709 } | |
| 710 | |
| 711 typedef _MainFunction(); | |
| 712 typedef _MainFunctionArgs(args); | |
| 713 typedef _MainFunctionArgsMessage(args, message); | |
| 714 | |
| 715 /// Note: IsolateNatives depends on _globalState which is only set up correctly | |
| 716 /// when 'dart:isolate' has been imported. | |
| 717 class IsolateNatives { | |
| 718 | |
| 719 // We set [enableSpawnWorker] to true (not null) when calling isolate | |
| 720 // primitives that require support for spawning workers. The field starts out | |
| 721 // by being null, and dart2js' type inference will track if it can have a | |
| 722 // non-null value. So by testing if this value is not null, we generate code | |
| 723 // that dart2js knows is dead when worker support isn't needed. | |
| 724 // TODO(herhut): Initialize this to false when able to track compile-time | |
| 725 // constants. | |
| 726 static var enableSpawnWorker; | |
| 727 | |
| 728 static String thisScript = computeThisScript(); | |
| 729 | |
| 730 /// Associates an ID with a native worker object. | |
| 731 static final Expando<int> workerIds = new Expando<int>(); | |
| 732 | |
| 733 /** | |
| 734 * The src url for the script tag that loaded this Used to create | |
| 735 * JavaScript workers. | |
| 736 */ | |
| 737 static String computeThisScript() { | |
| 738 var currentScript = JS('', r'init.currentScript'); | |
| 739 if (currentScript != null) { | |
| 740 return JS('String', 'String(#.src)', currentScript); | |
| 741 } | |
| 742 if (Primitives.isD8) return computeThisScriptD8(); | |
| 743 if (Primitives.isJsshell) return computeThisScriptJsshell(); | |
| 744 // A worker has no script tag - so get an url from a stack-trace. | |
| 745 if (_globalState.isWorker) return computeThisScriptFromTrace(); | |
| 746 return null; | |
| 747 } | |
| 748 | |
| 749 static String computeThisScriptJsshell() { | |
| 750 return JS('String|Null', 'thisFilename()'); | |
| 751 } | |
| 752 | |
| 753 // TODO(ahe): The following is for supporting D8. We should move this code | |
| 754 // to a helper library that is only loaded when testing on D8. | |
| 755 static String computeThisScriptD8() => computeThisScriptFromTrace(); | |
| 756 | |
| 757 static String computeThisScriptFromTrace() { | |
| 758 var stack = JS('String|Null', 'new Error().stack'); | |
| 759 if (stack == null) { | |
| 760 // According to Internet Explorer documentation, the stack | |
| 761 // property is not set until the exception is thrown. The stack | |
| 762 // property was not provided until IE10. | |
| 763 stack = JS('String|Null', | |
| 764 '(function() {' | |
| 765 'try { throw new Error() } catch(e) { return e.stack }' | |
| 766 '})()'); | |
| 767 if (stack == null) throw new UnsupportedError('No stack trace'); | |
| 768 } | |
| 769 var pattern, matches; | |
| 770 | |
| 771 // This pattern matches V8, Chrome, and Internet Explorer stack | |
| 772 // traces that look like this: | |
| 773 // Error | |
| 774 // at methodName (URI:LINE:COLUMN) | |
| 775 pattern = JS('', | |
| 776 r'new RegExp("^ *at [^(]*\\((.*):[0-9]*:[0-9]*\\)$", "m")'); | |
| 777 | |
| 778 | |
| 779 matches = JS('JSExtendableArray|Null', '#.match(#)', stack, pattern); | |
| 780 if (matches != null) return JS('String', '#[1]', matches); | |
| 781 | |
| 782 // This pattern matches Firefox stack traces that look like this: | |
| 783 // methodName@URI:LINE | |
| 784 pattern = JS('', r'new RegExp("^[^@]*@(.*):[0-9]*$", "m")'); | |
| 785 | |
| 786 matches = JS('JSExtendableArray|Null', '#.match(#)', stack, pattern); | |
| 787 if (matches != null) return JS('String', '#[1]', matches); | |
| 788 | |
| 789 throw new UnsupportedError('Cannot extract URI from "$stack"'); | |
| 790 } | |
| 791 | |
| 792 /** | |
| 793 * Assume that [e] is a browser message event and extract its message data. | |
| 794 * We don't import the dom explicitly so, when workers are disabled, this | |
| 795 * library can also run on top of nodejs. | |
| 796 */ | |
| 797 static _getEventData(e) => JS("", "#.data", e); | |
| 798 | |
| 799 /** | |
| 800 * Process messages on a worker, either to control the worker instance or to | |
| 801 * pass messages along to the isolate running in the worker. | |
| 802 */ | |
| 803 static void _processWorkerMessage(/* Worker */ sender, e) { | |
| 804 var msg = _deserializeMessage(_getEventData(e)); | |
| 805 switch (msg['command']) { | |
| 806 case 'start': | |
| 807 _globalState.currentManagerId = msg['id']; | |
| 808 String functionName = msg['functionName']; | |
| 809 Function entryPoint = (functionName == null) | |
| 810 ? _globalState.entry | |
| 811 : _getJSFunctionFromName(functionName); | |
| 812 var args = msg['args']; | |
| 813 var message = _deserializeMessage(msg['msg']); | |
| 814 var isSpawnUri = msg['isSpawnUri']; | |
| 815 var startPaused = msg['startPaused']; | |
| 816 var replyTo = _deserializeMessage(msg['replyTo']); | |
| 817 var context = new _IsolateContext(); | |
| 818 _globalState.topEventLoop.enqueue(context, () { | |
| 819 _startIsolate(entryPoint, args, message, | |
| 820 isSpawnUri, startPaused, replyTo); | |
| 821 }, 'worker-start'); | |
| 822 // Make sure we always have a current context in this worker. | |
| 823 // TODO(7907): This is currently needed because we're using | |
| 824 // Timers to implement Futures, and this isolate library | |
| 825 // implementation uses Futures. We should either stop using | |
| 826 // Futures in this library, or re-adapt if Futures get a | |
| 827 // different implementation. | |
| 828 _globalState.currentContext = context; | |
| 829 _globalState.topEventLoop.run(); | |
| 830 break; | |
| 831 case 'spawn-worker': | |
| 832 if (enableSpawnWorker != null) handleSpawnWorkerRequest(msg); | |
| 833 break; | |
| 834 case 'message': | |
| 835 SendPort port = msg['port']; | |
| 836 // If the port has been closed, we ignore the message. | |
| 837 if (port != null) { | |
| 838 msg['port'].send(msg['msg']); | |
| 839 } | |
| 840 _globalState.topEventLoop.run(); | |
| 841 break; | |
| 842 case 'close': | |
| 843 _globalState.managers.remove(workerIds[sender]); | |
| 844 JS('void', '#.terminate()', sender); | |
| 845 _globalState.topEventLoop.run(); | |
| 846 break; | |
| 847 case 'log': | |
| 848 _log(msg['msg']); | |
| 849 break; | |
| 850 case 'print': | |
| 851 if (_globalState.isWorker) { | |
| 852 _globalState.mainManager.postMessage( | |
| 853 _serializeMessage({'command': 'print', 'msg': msg})); | |
| 854 } else { | |
| 855 print(msg['msg']); | |
| 856 } | |
| 857 break; | |
| 858 case 'error': | |
| 859 throw msg['msg']; | |
| 860 } | |
| 861 } | |
| 862 | |
| 863 static handleSpawnWorkerRequest(msg) { | |
| 864 var replyPort = msg['replyPort']; | |
| 865 spawn(msg['functionName'], msg['uri'], | |
| 866 msg['args'], msg['msg'], | |
| 867 false, msg['isSpawnUri'], msg['startPaused']).then((msg) { | |
| 868 replyPort.send(msg); | |
| 869 }, onError: (String errorMessage) { | |
| 870 replyPort.send([_SPAWN_FAILED_SIGNAL, errorMessage]); | |
| 871 }); | |
| 872 } | |
| 873 | |
| 874 /** Log a message, forwarding to the main [_Manager] if appropriate. */ | |
| 875 static _log(msg) { | |
| 876 if (_globalState.isWorker) { | |
| 877 _globalState.mainManager.postMessage( | |
| 878 _serializeMessage({'command': 'log', 'msg': msg })); | |
| 879 } else { | |
| 880 try { | |
| 881 _consoleLog(msg); | |
| 882 } catch (e, trace) { | |
| 883 throw new Exception(trace); | |
| 884 } | |
| 885 } | |
| 886 } | |
| 887 | |
| 888 static void _consoleLog(msg) { | |
| 889 requiresPreamble(); | |
| 890 JS("void", r"self.console.log(#)", msg); | |
| 891 } | |
| 892 | |
| 893 static _getJSFunctionFromName(String functionName) { | |
| 894 return JS("", "init.globalFunctions[#]()", functionName); | |
| 895 } | |
| 896 | |
| 897 /** | |
| 898 * Get a string name for the function, if possible. The result for | |
| 899 * anonymous functions is browser-dependent -- it may be "" or "anonymous" | |
| 900 * but you should probably not count on this. | |
| 901 */ | |
| 902 static String _getJSFunctionName(Function f) { | |
| 903 return (f is Closure) ? JS("String|Null", r'#.$name', f) : null; | |
| 904 } | |
| 905 | |
| 906 /** Create a new JavaScript object instance given its constructor. */ | |
| 907 static dynamic _allocate(var ctor) { | |
| 908 return JS("", "new #()", ctor); | |
| 909 } | |
| 910 | |
| 911 static Future<List> spawnFunction(void topLevelFunction(message), | |
| 912 var message, | |
| 913 bool startPaused) { | |
| 914 IsolateNatives.enableSpawnWorker = true; | |
| 915 final name = _getJSFunctionName(topLevelFunction); | |
| 916 if (name == null) { | |
| 917 throw new UnsupportedError( | |
| 918 "only top-level functions can be spawned."); | |
| 919 } | |
| 920 bool isLight = false; | |
| 921 bool isSpawnUri = false; | |
| 922 return spawn(name, null, null, message, isLight, isSpawnUri, startPaused); | |
| 923 } | |
| 924 | |
| 925 static Future<List> spawnUri(Uri uri, List<String> args, var message, | |
| 926 bool startPaused) { | |
| 927 IsolateNatives.enableSpawnWorker = true; | |
| 928 bool isLight = false; | |
| 929 bool isSpawnUri = true; | |
| 930 return spawn(null, uri.toString(), args, message, | |
| 931 isLight, isSpawnUri, startPaused); | |
| 932 } | |
| 933 | |
| 934 // TODO(sigmund): clean up above, after we make the new API the default: | |
| 935 | |
| 936 /// If [uri] is `null` it is replaced with the current script. | |
| 937 static Future<List> spawn(String functionName, String uri, | |
| 938 List<String> args, message, | |
| 939 bool isLight, bool isSpawnUri, bool startPaused) { | |
| 940 // Assume that the compiled version of the Dart file lives just next to the | |
| 941 // dart file. | |
| 942 // TODO(floitsch): support precompiled version of dart2js output. | |
| 943 if (uri != null && uri.endsWith(".dart")) uri += ".js"; | |
| 944 | |
| 945 ReceivePort port = new ReceivePort(); | |
| 946 Completer<List> completer = new Completer(); | |
| 947 port.first.then((msg) { | |
| 948 if (msg[0] == _SPAWNED_SIGNAL) { | |
| 949 completer.complete(msg); | |
| 950 } else { | |
| 951 assert(msg[0] == _SPAWN_FAILED_SIGNAL); | |
| 952 completer.completeError(msg[1]); | |
| 953 } | |
| 954 }); | |
| 955 | |
| 956 SendPort signalReply = port.sendPort; | |
| 957 | |
| 958 if (_globalState.useWorkers && !isLight) { | |
| 959 _startWorker( | |
| 960 functionName, uri, args, message, isSpawnUri, startPaused, | |
| 961 signalReply, (String message) => completer.completeError(message)); | |
| 962 } else { | |
| 963 _startNonWorker( | |
| 964 functionName, uri, args, message, isSpawnUri, startPaused, | |
| 965 signalReply); | |
| 966 } | |
| 967 return completer.future; | |
| 968 } | |
| 969 | |
| 970 static void _startWorker( | |
| 971 String functionName, String uri, | |
| 972 List<String> args, message, | |
| 973 bool isSpawnUri, | |
| 974 bool startPaused, | |
| 975 SendPort replyPort, | |
| 976 void onError(String message)) { | |
| 977 if (_globalState.isWorker) { | |
| 978 _globalState.mainManager.postMessage(_serializeMessage({ | |
| 979 'command': 'spawn-worker', | |
| 980 'functionName': functionName, | |
| 981 'args': args, | |
| 982 'msg': message, | |
| 983 'uri': uri, | |
| 984 'isSpawnUri': isSpawnUri, | |
| 985 'startPaused': startPaused, | |
| 986 'replyPort': replyPort})); | |
| 987 } else { | |
| 988 _spawnWorker(functionName, uri, args, message, | |
| 989 isSpawnUri, startPaused, replyPort, onError); | |
| 990 } | |
| 991 } | |
| 992 | |
| 993 static void _startNonWorker( | |
| 994 String functionName, String uri, | |
| 995 List<String> args, var message, | |
| 996 bool isSpawnUri, | |
| 997 bool startPaused, | |
| 998 SendPort replyPort) { | |
| 999 // TODO(eub): support IE9 using an iframe -- Dart issue 1702. | |
| 1000 if (uri != null) { | |
| 1001 throw new UnsupportedError( | |
| 1002 "Currently spawnUri is not supported without web workers."); | |
| 1003 } | |
| 1004 message = _serializeMessage(message); | |
| 1005 args = _serializeMessage(args); // Or just args.toList() ? | |
| 1006 _globalState.topEventLoop.enqueue(new _IsolateContext(), () { | |
| 1007 final func = _getJSFunctionFromName(functionName); | |
| 1008 _startIsolate(func, args, message, isSpawnUri, startPaused, replyPort); | |
| 1009 }, 'nonworker start'); | |
| 1010 } | |
| 1011 | |
| 1012 static void _startIsolate(Function topLevel, | |
| 1013 List<String> args, message, | |
| 1014 bool isSpawnUri, | |
| 1015 bool startPaused, | |
| 1016 SendPort replyTo) { | |
| 1017 _IsolateContext context = JS_CURRENT_ISOLATE_CONTEXT(); | |
| 1018 Primitives.initializeStatics(context.id); | |
| 1019 // The isolate's port does not keep the isolate open. | |
| 1020 replyTo.send([_SPAWNED_SIGNAL, | |
| 1021 context.controlPort.sendPort, | |
| 1022 context.pauseCapability, | |
| 1023 context.terminateCapability]); | |
| 1024 | |
| 1025 void runStartFunction() { | |
| 1026 context.initialized = true; | |
| 1027 if (!isSpawnUri) { | |
| 1028 topLevel(message); | |
| 1029 } else if (topLevel is _MainFunctionArgsMessage) { | |
| 1030 topLevel(args, message); | |
| 1031 } else if (topLevel is _MainFunctionArgs) { | |
| 1032 topLevel(args); | |
| 1033 } else { | |
| 1034 topLevel(); | |
| 1035 } | |
| 1036 } | |
| 1037 | |
| 1038 if (startPaused) { | |
| 1039 context.addPause(context.pauseCapability, context.pauseCapability); | |
| 1040 _globalState.topEventLoop.enqueue(context, runStartFunction, | |
| 1041 'start isolate'); | |
| 1042 } else { | |
| 1043 runStartFunction(); | |
| 1044 } | |
| 1045 } | |
| 1046 | |
| 1047 /** | |
| 1048 * Spawns an isolate in a worker. [factoryName] is the Javascript constructor | |
| 1049 * name for the isolate entry point class. | |
| 1050 */ | |
| 1051 static void _spawnWorker(functionName, String uri, | |
| 1052 List<String> args, message, | |
| 1053 bool isSpawnUri, | |
| 1054 bool startPaused, | |
| 1055 SendPort replyPort, | |
| 1056 void onError(String message)) { | |
| 1057 if (uri == null) uri = thisScript; | |
| 1058 final worker = JS('var', 'new Worker(#)', uri); | |
| 1059 // Trampolines are used when wanting to call a Dart closure from | |
| 1060 // JavaScript. The helper function DART_CLOSURE_TO_JS only accepts | |
| 1061 // top-level or static methods, and the trampoline allows us to capture | |
| 1062 // arguments and values which can be passed to a static method. | |
| 1063 final onerrorTrampoline = JS( | |
| 1064 '', | |
| 1065 ''' | |
| 1066 (function (f, u, c) { | |
| 1067 return function(e) { | |
| 1068 return f(e, u, c) | |
| 1069 } | |
| 1070 })(#, #, #)''', | |
| 1071 DART_CLOSURE_TO_JS(workerOnError), uri, onError); | |
| 1072 JS('void', '#.onerror = #', worker, onerrorTrampoline); | |
| 1073 | |
| 1074 var processWorkerMessageTrampoline = JS( | |
| 1075 '', | |
| 1076 """ | |
| 1077 (function (f, a) { | |
| 1078 return function (e) { | |
| 1079 // We can stop listening for errors when the first message is received as | |
| 1080 // we only listen for messages to determine if the uri was bad. | |
| 1081 e.onerror = null; | |
| 1082 return f(a, e); | |
| 1083 } | |
| 1084 })(#, #)""", | |
| 1085 DART_CLOSURE_TO_JS(_processWorkerMessage), | |
| 1086 worker); | |
| 1087 JS('void', '#.onmessage = #', worker, processWorkerMessageTrampoline); | |
| 1088 var workerId = _globalState.nextManagerId++; | |
| 1089 // We also store the id on the worker itself so that we can unregister it. | |
| 1090 workerIds[worker] = workerId; | |
| 1091 _globalState.managers[workerId] = worker; | |
| 1092 JS('void', '#.postMessage(#)', worker, _serializeMessage({ | |
| 1093 'command': 'start', | |
| 1094 'id': workerId, | |
| 1095 // Note: we serialize replyPort twice because the child worker needs to | |
| 1096 // first deserialize the worker id, before it can correctly deserialize | |
| 1097 // the port (port deserialization is sensitive to what is the current | |
| 1098 // workerId). | |
| 1099 'replyTo': _serializeMessage(replyPort), | |
| 1100 'args': args, | |
| 1101 'msg': _serializeMessage(message), | |
| 1102 'isSpawnUri': isSpawnUri, | |
| 1103 'startPaused': startPaused, | |
| 1104 'functionName': functionName })); | |
| 1105 } | |
| 1106 | |
| 1107 static bool workerOnError( | |
| 1108 /* Event */ event, | |
| 1109 String uri, | |
| 1110 void onError(String message)) { | |
| 1111 // Attempt to shut up the browser, as the error has been handled. Chrome | |
| 1112 // ignores this :-( | |
| 1113 JS('void', '#.preventDefault()', event); | |
| 1114 String message = JS('String|Null', '#.message', event); | |
| 1115 if (message == null) { | |
| 1116 // Some browsers, including Chrome, fail to provide a proper error | |
| 1117 // event. | |
| 1118 message = 'Error spawning worker for $uri'; | |
| 1119 } else { | |
| 1120 message = 'Error spawning worker for $uri ($message)'; | |
| 1121 } | |
| 1122 onError(message); | |
| 1123 return true; | |
| 1124 } | |
| 1125 } | |
| 1126 | |
| 1127 /******************************************************** | |
| 1128 Inserted from lib/isolate/dart2js/ports.dart | |
| 1129 ********************************************************/ | |
| 1130 | |
| 1131 /** Common functionality to all send ports. */ | |
| 1132 abstract class _BaseSendPort implements SendPort { | |
| 1133 /** Id for the destination isolate. */ | |
| 1134 final int _isolateId; | |
| 1135 | |
| 1136 const _BaseSendPort(this._isolateId); | |
| 1137 | |
| 1138 void _checkReplyTo(SendPort replyTo) { | |
| 1139 if (replyTo != null | |
| 1140 && replyTo is! _NativeJsSendPort | |
| 1141 && replyTo is! _WorkerSendPort) { | |
| 1142 throw new Exception("SendPort.send: Illegal replyTo port type"); | |
| 1143 } | |
| 1144 } | |
| 1145 | |
| 1146 void send(var message); | |
| 1147 bool operator ==(var other); | |
| 1148 int get hashCode; | |
| 1149 } | |
| 1150 | |
| 1151 /** A send port that delivers messages in-memory via native JavaScript calls. */ | |
| 1152 class _NativeJsSendPort extends _BaseSendPort implements SendPort { | |
| 1153 final RawReceivePortImpl _receivePort; | |
| 1154 | |
| 1155 const _NativeJsSendPort(this._receivePort, int isolateId) : super(isolateId); | |
| 1156 | |
| 1157 void send(var message) { | |
| 1158 // Check that the isolate still runs and the port is still open | |
| 1159 final isolate = _globalState.isolates[_isolateId]; | |
| 1160 if (isolate == null) return; | |
| 1161 if (_receivePort._isClosed) return; | |
| 1162 // We force serialization/deserialization as a simple way to ensure | |
| 1163 // isolate communication restrictions are respected between isolates that | |
| 1164 // live in the same worker. [_NativeJsSendPort] delivers both messages | |
| 1165 // from the same worker and messages from other workers. In particular, | |
| 1166 // messages sent from a worker via a [_WorkerSendPort] are received at | |
| 1167 // [_processWorkerMessage] and forwarded to a native port. In such cases, | |
| 1168 // here we'll see [_globalState.currentContext == null]. | |
| 1169 final shouldSerialize = _globalState.currentContext != null | |
| 1170 && _globalState.currentContext.id != _isolateId; | |
| 1171 var msg = message; | |
| 1172 if (shouldSerialize) { | |
| 1173 msg = _serializeMessage(msg); | |
| 1174 } | |
| 1175 if (isolate.controlPort == _receivePort) { | |
| 1176 isolate.handleControlMessage(msg); | |
| 1177 return; | |
| 1178 } | |
| 1179 _globalState.topEventLoop.enqueue(isolate, () { | |
| 1180 if (!_receivePort._isClosed) { | |
| 1181 if (shouldSerialize) { | |
| 1182 msg = _deserializeMessage(msg); | |
| 1183 } | |
| 1184 _receivePort._add(msg); | |
| 1185 } | |
| 1186 }, 'receive $message'); | |
| 1187 } | |
| 1188 | |
| 1189 bool operator ==(var other) => (other is _NativeJsSendPort) && | |
| 1190 (_receivePort == other._receivePort); | |
| 1191 | |
| 1192 int get hashCode => _receivePort._id; | |
| 1193 } | |
| 1194 | |
| 1195 /** A send port that delivers messages via worker.postMessage. */ | |
| 1196 // TODO(eub): abstract this for iframes. | |
| 1197 class _WorkerSendPort extends _BaseSendPort implements SendPort { | |
| 1198 final int _workerId; | |
| 1199 final int _receivePortId; | |
| 1200 | |
| 1201 const _WorkerSendPort(this._workerId, int isolateId, this._receivePortId) | |
| 1202 : super(isolateId); | |
| 1203 | |
| 1204 void send(var message) { | |
| 1205 final workerMessage = _serializeMessage({ | |
| 1206 'command': 'message', | |
| 1207 'port': this, | |
| 1208 'msg': message}); | |
| 1209 | |
| 1210 if (_globalState.isWorker) { | |
| 1211 // Communication from one worker to another go through the | |
| 1212 // main worker. | |
| 1213 _globalState.mainManager.postMessage(workerMessage); | |
| 1214 } else { | |
| 1215 // Deliver the message only if the worker is still alive. | |
| 1216 /* Worker */ var manager = _globalState.managers[_workerId]; | |
| 1217 if (manager != null) { | |
| 1218 JS('void', '#.postMessage(#)', manager, workerMessage); | |
| 1219 } | |
| 1220 } | |
| 1221 } | |
| 1222 | |
| 1223 bool operator ==(var other) { | |
| 1224 return (other is _WorkerSendPort) && | |
| 1225 (_workerId == other._workerId) && | |
| 1226 (_isolateId == other._isolateId) && | |
| 1227 (_receivePortId == other._receivePortId); | |
| 1228 } | |
| 1229 | |
| 1230 int get hashCode { | |
| 1231 // TODO(sigmund): use a standard hash when we get one available in corelib. | |
| 1232 return (_workerId << 16) ^ (_isolateId << 8) ^ _receivePortId; | |
| 1233 } | |
| 1234 } | |
| 1235 | |
| 1236 class RawReceivePortImpl implements RawReceivePort { | |
| 1237 static int _nextFreeId = 1; | |
| 1238 | |
| 1239 final int _id; | |
| 1240 Function _handler; | |
| 1241 bool _isClosed = false; | |
| 1242 | |
| 1243 RawReceivePortImpl(this._handler) : _id = _nextFreeId++ { | |
| 1244 _globalState.currentContext.register(_id, this); | |
| 1245 } | |
| 1246 | |
| 1247 RawReceivePortImpl.weak(this._handler) : _id = _nextFreeId++ { | |
| 1248 _globalState.currentContext.registerWeak(_id, this); | |
| 1249 } | |
| 1250 | |
| 1251 // Creates the control port of an isolate. | |
| 1252 // This is created before the isolate context object itself, | |
| 1253 // so it cannot access the static _nextFreeId field. | |
| 1254 RawReceivePortImpl._controlPort() : _handler = null, _id = 0; | |
| 1255 | |
| 1256 void set handler(Function newHandler) { | |
| 1257 _handler = newHandler; | |
| 1258 } | |
| 1259 | |
| 1260 // Close the port without unregistering it. | |
| 1261 // Used by an isolate context to close all ports when shutting down. | |
| 1262 void _close() { | |
| 1263 _isClosed = true; | |
| 1264 _handler = null; | |
| 1265 } | |
| 1266 | |
| 1267 void close() { | |
| 1268 if (_isClosed) return; | |
| 1269 _isClosed = true; | |
| 1270 _handler = null; | |
| 1271 _globalState.currentContext.unregister(_id); | |
| 1272 } | |
| 1273 | |
| 1274 void _add(dataEvent) { | |
| 1275 if (_isClosed) return; | |
| 1276 _handler(dataEvent); | |
| 1277 } | |
| 1278 | |
| 1279 SendPort get sendPort { | |
| 1280 return new _NativeJsSendPort(this, _globalState.currentContext.id); | |
| 1281 } | |
| 1282 } | |
| 1283 | |
| 1284 class ReceivePortImpl extends Stream implements ReceivePort { | |
| 1285 final RawReceivePort _rawPort; | |
| 1286 StreamController _controller; | |
| 1287 | |
| 1288 ReceivePortImpl() : this.fromRawReceivePort(new RawReceivePortImpl(null)); | |
| 1289 | |
| 1290 ReceivePortImpl.weak() | |
| 1291 : this.fromRawReceivePort(new RawReceivePortImpl.weak(null)); | |
| 1292 | |
| 1293 ReceivePortImpl.fromRawReceivePort(this._rawPort) { | |
| 1294 _controller = new StreamController(onCancel: close, sync: true); | |
| 1295 _rawPort.handler = _controller.add; | |
| 1296 } | |
| 1297 | |
| 1298 StreamSubscription listen(void onData(var event), | |
| 1299 {Function onError, | |
| 1300 void onDone(), | |
| 1301 bool cancelOnError}) { | |
| 1302 return _controller.stream.listen(onData, onError: onError, onDone: onDone, | |
| 1303 cancelOnError: cancelOnError); | |
| 1304 } | |
| 1305 | |
| 1306 void close() { | |
| 1307 _rawPort.close(); | |
| 1308 _controller.close(); | |
| 1309 } | |
| 1310 | |
| 1311 SendPort get sendPort => _rawPort.sendPort; | |
| 1312 } | |
| 1313 | |
| 1314 | |
| 1315 /******************************************************** | |
| 1316 Inserted from lib/isolate/dart2js/messages.dart | |
| 1317 ********************************************************/ | |
| 1318 | |
| 1319 // Defines message visitors, serialization, and deserialization. | |
| 1320 | |
| 1321 /** Serialize [message] (or simulate serialization). */ | |
| 1322 _serializeMessage(message) { | |
| 1323 if (_globalState.needSerialization) { | |
| 1324 return new _JsSerializer().traverse(message); | |
| 1325 } else { | |
| 1326 return new _JsCopier().traverse(message); | |
| 1327 } | |
| 1328 } | |
| 1329 | |
| 1330 /** Deserialize [message] (or simulate deserialization). */ | |
| 1331 _deserializeMessage(message) { | |
| 1332 if (_globalState.needSerialization) { | |
| 1333 return new _JsDeserializer().deserialize(message); | |
| 1334 } else { | |
| 1335 // Nothing more to do. | |
| 1336 return message; | |
| 1337 } | |
| 1338 } | |
| 1339 | |
| 1340 class _JsSerializer extends _Serializer { | |
| 1341 | |
| 1342 _JsSerializer() : super() { _visited = new _JsVisitedMap(); } | |
| 1343 | |
| 1344 visitSendPort(SendPort x) { | |
| 1345 if (x is _NativeJsSendPort) return visitNativeJsSendPort(x); | |
| 1346 if (x is _WorkerSendPort) return visitWorkerSendPort(x); | |
| 1347 throw "Illegal underlying port $x"; | |
| 1348 } | |
| 1349 | |
| 1350 visitCapability(Capability x) { | |
| 1351 if (x is CapabilityImpl) { | |
| 1352 return ['capability', x._id]; | |
| 1353 } | |
| 1354 throw "Capability not serializable: $x"; | |
| 1355 } | |
| 1356 | |
| 1357 visitNativeJsSendPort(_NativeJsSendPort port) { | |
| 1358 return ['sendport', _globalState.currentManagerId, | |
| 1359 port._isolateId, port._receivePort._id]; | |
| 1360 } | |
| 1361 | |
| 1362 visitWorkerSendPort(_WorkerSendPort port) { | |
| 1363 return ['sendport', port._workerId, port._isolateId, port._receivePortId]; | |
| 1364 } | |
| 1365 } | |
| 1366 | |
| 1367 | |
| 1368 class _JsCopier extends _Copier { | |
| 1369 | |
| 1370 _JsCopier() : super() { _visited = new _JsVisitedMap(); } | |
| 1371 | |
| 1372 visitSendPort(SendPort x) { | |
| 1373 if (x is _NativeJsSendPort) return visitNativeJsSendPort(x); | |
| 1374 if (x is _WorkerSendPort) return visitWorkerSendPort(x); | |
| 1375 throw "Illegal underlying port $x"; | |
| 1376 } | |
| 1377 | |
| 1378 visitCapability(Capability x) { | |
| 1379 if (x is CapabilityImpl) { | |
| 1380 return new CapabilityImpl._internal(x._id); | |
| 1381 } | |
| 1382 throw "Capability not serializable: $x"; | |
| 1383 } | |
| 1384 | |
| 1385 SendPort visitNativeJsSendPort(_NativeJsSendPort port) { | |
| 1386 return new _NativeJsSendPort(port._receivePort, port._isolateId); | |
| 1387 } | |
| 1388 | |
| 1389 SendPort visitWorkerSendPort(_WorkerSendPort port) { | |
| 1390 return new _WorkerSendPort( | |
| 1391 port._workerId, port._isolateId, port._receivePortId); | |
| 1392 } | |
| 1393 } | |
| 1394 | |
| 1395 class _JsDeserializer extends _Deserializer { | |
| 1396 | |
| 1397 SendPort deserializeSendPort(List list) { | |
| 1398 int managerId = list[1]; | |
| 1399 int isolateId = list[2]; | |
| 1400 int receivePortId = list[3]; | |
| 1401 // If two isolates are in the same manager, we use NativeJsSendPorts to | |
| 1402 // deliver messages directly without using postMessage. | |
| 1403 if (managerId == _globalState.currentManagerId) { | |
| 1404 var isolate = _globalState.isolates[isolateId]; | |
| 1405 if (isolate == null) return null; // Isolate has been closed. | |
| 1406 var receivePort = isolate.lookup(receivePortId); | |
| 1407 if (receivePort == null) return null; // Port has been closed. | |
| 1408 return new _NativeJsSendPort(receivePort, isolateId); | |
| 1409 } else { | |
| 1410 return new _WorkerSendPort(managerId, isolateId, receivePortId); | |
| 1411 } | |
| 1412 } | |
| 1413 | |
| 1414 Capability deserializeCapability(List list) { | |
| 1415 return new CapabilityImpl._internal(list[1]); | |
| 1416 } | |
| 1417 } | |
| 1418 | |
| 1419 class _JsVisitedMap implements _MessageTraverserVisitedMap { | |
| 1420 List tagged; | |
| 1421 | |
| 1422 /** Retrieves any information stored in the native object [object]. */ | |
| 1423 operator[](var object) { | |
| 1424 return _getAttachedInfo(object); | |
| 1425 } | |
| 1426 | |
| 1427 /** Injects some information into the native [object]. */ | |
| 1428 void operator[]=(var object, var info) { | |
| 1429 tagged.add(object); | |
| 1430 _setAttachedInfo(object, info); | |
| 1431 } | |
| 1432 | |
| 1433 /** Get ready to rumble. */ | |
| 1434 void reset() { | |
| 1435 assert(tagged == null); | |
| 1436 tagged = new List(); | |
| 1437 } | |
| 1438 | |
| 1439 /** Remove all information injected in the native objects. */ | |
| 1440 void cleanup() { | |
| 1441 for (int i = 0, length = tagged.length; i < length; i++) { | |
| 1442 _clearAttachedInfo(tagged[i]); | |
| 1443 } | |
| 1444 tagged = null; | |
| 1445 } | |
| 1446 | |
| 1447 void _clearAttachedInfo(var o) { | |
| 1448 JS("void", "#['__MessageTraverser__attached_info__'] = #", o, null); | |
| 1449 } | |
| 1450 | |
| 1451 void _setAttachedInfo(var o, var info) { | |
| 1452 JS("void", "#['__MessageTraverser__attached_info__'] = #", o, info); | |
| 1453 } | |
| 1454 | |
| 1455 _getAttachedInfo(var o) { | |
| 1456 return JS("", "#['__MessageTraverser__attached_info__']", o); | |
| 1457 } | |
| 1458 } | |
| 1459 | |
| 1460 // only visible for testing purposes | |
| 1461 // TODO(sigmund): remove once we can disable privacy for testing (bug #1882) | |
| 1462 class TestingOnly { | |
| 1463 static copy(x) { | |
| 1464 return new _JsCopier().traverse(x); | |
| 1465 } | |
| 1466 | |
| 1467 // only visible for testing purposes | |
| 1468 static serialize(x) { | |
| 1469 _Serializer serializer = new _JsSerializer(); | |
| 1470 _Deserializer deserializer = new _JsDeserializer(); | |
| 1471 return deserializer.deserialize(serializer.traverse(x)); | |
| 1472 } | |
| 1473 } | |
| 1474 | |
| 1475 /******************************************************** | |
| 1476 Inserted from lib/isolate/serialization.dart | |
| 1477 ********************************************************/ | |
| 1478 | |
| 1479 class _MessageTraverserVisitedMap { | |
| 1480 | |
| 1481 operator[](var object) => null; | |
| 1482 void operator[]=(var object, var info) { } | |
| 1483 | |
| 1484 void reset() { } | |
| 1485 void cleanup() { } | |
| 1486 | |
| 1487 } | |
| 1488 | |
| 1489 /** Abstract visitor for dart objects that can be sent as isolate messages. */ | |
| 1490 abstract class _MessageTraverser { | |
| 1491 | |
| 1492 _MessageTraverserVisitedMap _visited; | |
| 1493 _MessageTraverser() : _visited = new _MessageTraverserVisitedMap(); | |
| 1494 | |
| 1495 /** Visitor's entry point. */ | |
| 1496 traverse(var x) { | |
| 1497 if (isPrimitive(x)) return visitPrimitive(x); | |
| 1498 _visited.reset(); | |
| 1499 var result; | |
| 1500 try { | |
| 1501 result = _dispatch(x); | |
| 1502 } finally { | |
| 1503 _visited.cleanup(); | |
| 1504 } | |
| 1505 return result; | |
| 1506 } | |
| 1507 | |
| 1508 _dispatch(var x) { | |
| 1509 // This code likely fails for user classes implementing | |
| 1510 // SendPort and Capability because it assumes the internal classes. | |
| 1511 if (isPrimitive(x)) return visitPrimitive(x); | |
| 1512 if (x is List) return visitList(x); | |
| 1513 if (x is Map) return visitMap(x); | |
| 1514 if (x is SendPort) return visitSendPort(x); | |
| 1515 if (x is Capability) return visitCapability(x); | |
| 1516 | |
| 1517 // Overridable fallback. | |
| 1518 return visitObject(x); | |
| 1519 } | |
| 1520 | |
| 1521 visitPrimitive(x); | |
| 1522 visitList(List x); | |
| 1523 visitMap(Map x); | |
| 1524 visitSendPort(SendPort x); | |
| 1525 visitCapability(Capability x); | |
| 1526 | |
| 1527 visitObject(Object x) { | |
| 1528 // TODO(floitsch): make this a real exception. (which one)? | |
| 1529 throw "Message serialization: Illegal value $x passed"; | |
| 1530 } | |
| 1531 | |
| 1532 static bool isPrimitive(x) { | |
| 1533 return (x == null) || (x is String) || (x is num) || (x is bool); | |
| 1534 } | |
| 1535 } | |
| 1536 | |
| 1537 | |
| 1538 /** A visitor that recursively copies a message. */ | |
| 1539 class _Copier extends _MessageTraverser { | |
| 1540 | |
| 1541 visitPrimitive(x) => x; | |
| 1542 | |
| 1543 List visitList(List list) { | |
| 1544 List copy = _visited[list]; | |
| 1545 if (copy != null) return copy; | |
| 1546 | |
| 1547 int len = list.length; | |
| 1548 | |
| 1549 // TODO(floitsch): we loose the generic type of the List. | |
| 1550 copy = new List(len); | |
| 1551 _visited[list] = copy; | |
| 1552 for (int i = 0; i < len; i++) { | |
| 1553 copy[i] = _dispatch(list[i]); | |
| 1554 } | |
| 1555 return copy; | |
| 1556 } | |
| 1557 | |
| 1558 Map visitMap(Map map) { | |
| 1559 Map copy = _visited[map]; | |
| 1560 if (copy != null) return copy; | |
| 1561 | |
| 1562 // TODO(floitsch): we loose the generic type of the map. | |
| 1563 copy = new Map(); | |
| 1564 _visited[map] = copy; | |
| 1565 map.forEach((key, val) { | |
| 1566 copy[_dispatch(key)] = _dispatch(val); | |
| 1567 }); | |
| 1568 return copy; | |
| 1569 } | |
| 1570 | |
| 1571 visitSendPort(SendPort x) => throw new UnimplementedError(); | |
| 1572 | |
| 1573 visitCapability(Capability x) => throw new UnimplementedError(); | |
| 1574 } | |
| 1575 | |
| 1576 /** Visitor that serializes a message as a JSON array. */ | |
| 1577 class _Serializer extends _MessageTraverser { | |
| 1578 int _nextFreeRefId = 0; | |
| 1579 | |
| 1580 visitPrimitive(x) => x; | |
| 1581 | |
| 1582 visitList(List list) { | |
| 1583 int copyId = _visited[list]; | |
| 1584 if (copyId != null) return ['ref', copyId]; | |
| 1585 | |
| 1586 int id = _nextFreeRefId++; | |
| 1587 _visited[list] = id; | |
| 1588 var jsArray = _serializeList(list); | |
| 1589 // TODO(floitsch): we are losing the generic type. | |
| 1590 return ['list', id, jsArray]; | |
| 1591 } | |
| 1592 | |
| 1593 visitMap(Map map) { | |
| 1594 int copyId = _visited[map]; | |
| 1595 if (copyId != null) return ['ref', copyId]; | |
| 1596 | |
| 1597 int id = _nextFreeRefId++; | |
| 1598 _visited[map] = id; | |
| 1599 var keys = _serializeList(map.keys.toList()); | |
| 1600 var values = _serializeList(map.values.toList()); | |
| 1601 // TODO(floitsch): we are losing the generic type. | |
| 1602 return ['map', id, keys, values]; | |
| 1603 } | |
| 1604 | |
| 1605 _serializeList(List list) { | |
| 1606 int len = list.length; | |
| 1607 // Use a growable list because we do not add extra properties on | |
| 1608 // them. | |
| 1609 var result = new List()..length = len; | |
| 1610 for (int i = 0; i < len; i++) { | |
| 1611 result[i] = _dispatch(list[i]); | |
| 1612 } | |
| 1613 return result; | |
| 1614 } | |
| 1615 | |
| 1616 visitSendPort(SendPort x) => throw new UnimplementedError(); | |
| 1617 | |
| 1618 visitCapability(Capability x) => throw new UnimplementedError(); | |
| 1619 } | |
| 1620 | |
| 1621 /** Deserializes arrays created with [_Serializer]. */ | |
| 1622 abstract class _Deserializer { | |
| 1623 Map<int, dynamic> _deserialized; | |
| 1624 | |
| 1625 _Deserializer(); | |
| 1626 | |
| 1627 static bool isPrimitive(x) { | |
| 1628 return (x == null) || (x is String) || (x is num) || (x is bool); | |
| 1629 } | |
| 1630 | |
| 1631 deserialize(x) { | |
| 1632 if (isPrimitive(x)) return x; | |
| 1633 // TODO(floitsch): this should be new HashMap<int, dynamic>() | |
| 1634 _deserialized = new HashMap(); | |
| 1635 return _deserializeHelper(x); | |
| 1636 } | |
| 1637 | |
| 1638 _deserializeHelper(x) { | |
| 1639 if (isPrimitive(x)) return x; | |
| 1640 assert(x is List); | |
| 1641 switch (x[0]) { | |
| 1642 case 'ref': return _deserializeRef(x); | |
| 1643 case 'list': return _deserializeList(x); | |
| 1644 case 'map': return _deserializeMap(x); | |
| 1645 case 'sendport': return deserializeSendPort(x); | |
| 1646 case 'capability': return deserializeCapability(x); | |
| 1647 default: return deserializeObject(x); | |
| 1648 } | |
| 1649 } | |
| 1650 | |
| 1651 _deserializeRef(List x) { | |
| 1652 int id = x[1]; | |
| 1653 var result = _deserialized[id]; | |
| 1654 assert(result != null); | |
| 1655 return result; | |
| 1656 } | |
| 1657 | |
| 1658 List _deserializeList(List x) { | |
| 1659 int id = x[1]; | |
| 1660 // We rely on the fact that Dart-lists are directly mapped to Js-arrays. | |
| 1661 List dartList = x[2]; | |
| 1662 _deserialized[id] = dartList; | |
| 1663 int len = dartList.length; | |
| 1664 for (int i = 0; i < len; i++) { | |
| 1665 dartList[i] = _deserializeHelper(dartList[i]); | |
| 1666 } | |
| 1667 return dartList; | |
| 1668 } | |
| 1669 | |
| 1670 Map _deserializeMap(List x) { | |
| 1671 Map result = new Map(); | |
| 1672 int id = x[1]; | |
| 1673 _deserialized[id] = result; | |
| 1674 List keys = x[2]; | |
| 1675 List values = x[3]; | |
| 1676 int len = keys.length; | |
| 1677 assert(len == values.length); | |
| 1678 for (int i = 0; i < len; i++) { | |
| 1679 var key = _deserializeHelper(keys[i]); | |
| 1680 var value = _deserializeHelper(values[i]); | |
| 1681 result[key] = value; | |
| 1682 } | |
| 1683 return result; | |
| 1684 } | |
| 1685 | |
| 1686 deserializeSendPort(List x); | |
| 1687 | |
| 1688 deserializeCapability(List x); | |
| 1689 | |
| 1690 deserializeObject(List x) { | |
| 1691 // TODO(floitsch): Use real exception (which one?). | |
| 1692 throw "Unexpected serialized object"; | |
| 1693 } | |
| 1694 } | |
| 1695 | |
| 1696 class TimerImpl implements Timer { | |
| 1697 final bool _once; | |
| 1698 bool _inEventLoop = false; | |
| 1699 int _handle; | |
| 1700 | |
| 1701 TimerImpl(int milliseconds, void callback()) | |
| 1702 : _once = true { | |
| 1703 if (milliseconds == 0 && (!hasTimer() || _globalState.isWorker)) { | |
| 1704 | |
| 1705 void internalCallback() { | |
| 1706 _handle = null; | |
| 1707 callback(); | |
| 1708 } | |
| 1709 | |
| 1710 // Setting _handle to something different from null indicates that the | |
| 1711 // callback has not been run. Hence, the choice of 1 is arbitrary. | |
| 1712 _handle = 1; | |
| 1713 | |
| 1714 // This makes a dependency between the async library and the | |
| 1715 // event loop of the isolate library. The compiler makes sure | |
| 1716 // that the event loop is compiled if [Timer] is used. | |
| 1717 // TODO(7907): In case of web workers, we need to use the event | |
| 1718 // loop instead of setTimeout, to make sure the futures get executed in | |
| 1719 // order. | |
| 1720 _globalState.topEventLoop.enqueue( | |
| 1721 _globalState.currentContext, internalCallback, 'timer'); | |
| 1722 _inEventLoop = true; | |
| 1723 } else if (hasTimer()) { | |
| 1724 | |
| 1725 void internalCallback() { | |
| 1726 _handle = null; | |
| 1727 leaveJsAsync(); | |
| 1728 callback(); | |
| 1729 } | |
| 1730 | |
| 1731 enterJsAsync(); | |
| 1732 | |
| 1733 _handle = JS('int', 'self.setTimeout(#, #)', | |
| 1734 convertDartClosureToJS(internalCallback, 0), | |
| 1735 milliseconds); | |
| 1736 } else { | |
| 1737 assert(milliseconds > 0); | |
| 1738 throw new UnsupportedError("Timer greater than 0."); | |
| 1739 } | |
| 1740 } | |
| 1741 | |
| 1742 TimerImpl.periodic(int milliseconds, void callback(Timer timer)) | |
| 1743 : _once = false { | |
| 1744 if (hasTimer()) { | |
| 1745 enterJsAsync(); | |
| 1746 _handle = JS('int', 'self.setInterval(#, #)', | |
| 1747 convertDartClosureToJS(() { callback(this); }, 0), | |
| 1748 milliseconds); | |
| 1749 } else { | |
| 1750 throw new UnsupportedError("Periodic timer."); | |
| 1751 } | |
| 1752 } | |
| 1753 | |
| 1754 void cancel() { | |
| 1755 if (hasTimer()) { | |
| 1756 if (_inEventLoop) { | |
| 1757 throw new UnsupportedError("Timer in event loop cannot be canceled."); | |
| 1758 } | |
| 1759 if (_handle == null) return; | |
| 1760 leaveJsAsync(); | |
| 1761 if (_once) { | |
| 1762 JS('void', 'self.clearTimeout(#)', _handle); | |
| 1763 } else { | |
| 1764 JS('void', 'self.clearInterval(#)', _handle); | |
| 1765 } | |
| 1766 _handle = null; | |
| 1767 } else { | |
| 1768 throw new UnsupportedError("Canceling a timer."); | |
| 1769 } | |
| 1770 } | |
| 1771 | |
| 1772 bool get isActive => _handle != null; | |
| 1773 } | |
| 1774 | |
| 1775 bool hasTimer() { | |
| 1776 requiresPreamble(); | |
| 1777 return JS('', 'self.setTimeout') != null; | |
| 1778 } | |
| 1779 | |
| 1780 | |
| 1781 /** | |
| 1782 * Implementation class for [Capability]. | |
| 1783 * | |
| 1784 * It has the same name to make it harder for users to distinguish. | |
| 1785 */ | |
| 1786 class CapabilityImpl implements Capability { | |
| 1787 /** Internal random secret identifying the capability. */ | |
| 1788 final int _id; | |
| 1789 | |
| 1790 CapabilityImpl() : this._internal(random64()); | |
| 1791 | |
| 1792 CapabilityImpl._internal(this._id); | |
| 1793 | |
| 1794 int get hashCode { | |
| 1795 // Thomas Wang 32 bit Mix. | |
| 1796 // http://www.concentric.net/~Ttwang/tech/inthash.htm | |
| 1797 // (via https://gist.github.com/badboy/6267743) | |
| 1798 int hash = _id; | |
| 1799 hash = (hash >> 0) ^ (hash ~/ 0x100000000); // To 32 bit from ~64. | |
| 1800 hash = (~hash + (hash << 15)) & 0xFFFFFFFF; | |
| 1801 hash ^= hash >> 12; | |
| 1802 hash = (hash * 5) & 0xFFFFFFFF; | |
| 1803 hash ^= hash >> 4; | |
| 1804 hash = (hash * 2057) & 0xFFFFFFFF; | |
| 1805 hash ^= hash >> 16; | |
| 1806 return hash; | |
| 1807 } | |
| 1808 | |
| 1809 bool operator==(Object other) { | |
| 1810 if (identical(other, this)) return true; | |
| 1811 if (other is CapabilityImpl) { | |
| 1812 return identical(_id, other._id); | |
| 1813 } | |
| 1814 return false; | |
| 1815 } | |
| 1816 } | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 538513002:
Move js library back into compiler directory. (Closed)
Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart