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| 1 // Copyright (c) 2013, 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 part of dart2js.js_emitter; | |
| 6 | |
| 7 // TODO(ahe): Share these with js_helper.dart. | |
| 8 const FUNCTION_INDEX = 0; | |
| 9 const NAME_INDEX = 1; | |
| 10 const CALL_NAME_INDEX = 2; | |
| 11 const REQUIRED_PARAMETER_INDEX = 3; | |
| 12 const OPTIONAL_PARAMETER_INDEX = 4; | |
| 13 const DEFAULT_ARGUMENTS_INDEX = 5; | |
| 14 | |
| 15 const bool VALIDATE_DATA = false; | |
| 16 | |
| 17 const RANGE1_SIZE = RANGE1_LAST - RANGE1_FIRST + 1; | |
| 18 const RANGE2_SIZE = RANGE2_LAST - RANGE2_FIRST + 1; | |
| 19 const RANGE1_ADJUST = - (FIRST_FIELD_CODE - RANGE1_FIRST); | |
| 20 const RANGE2_ADJUST = - (FIRST_FIELD_CODE + RANGE1_SIZE - RANGE2_FIRST); | |
| 21 const RANGE3_ADJUST = | |
| 22 - (FIRST_FIELD_CODE + RANGE1_SIZE + RANGE2_SIZE - RANGE3_FIRST); | |
| 23 | |
| 24 const String setupProgramName ='setupProgram'; | |
| 25 // TODO(floitsch): make sure this property can't clash with anything. It's | |
| 26 // unlikely since it lives on types, but still. | |
| 27 const String typeNameProperty = r'builtin$cls'; | |
| 28 | |
| 29 jsAst.Statement buildSetupProgram(Program program, Compiler compiler, | |
| 30 JavaScriptBackend backend, | |
| 31 Namer namer, | |
| 32 OldEmitter emitter) { | |
| 33 | |
| 34 jsAst.Expression typeInformationAccess = | |
| 35 emitter.generateEmbeddedGlobalAccess(embeddedNames.TYPE_INFORMATION); | |
| 36 jsAst.Expression globalFunctionsAccess = | |
| 37 emitter.generateEmbeddedGlobalAccess(embeddedNames.GLOBAL_FUNCTIONS); | |
| 38 jsAst.Expression staticsAccess = | |
| 39 emitter.generateEmbeddedGlobalAccess(embeddedNames.STATICS); | |
| 40 jsAst.Expression interceptedNamesAccess = | |
| 41 emitter.generateEmbeddedGlobalAccess(embeddedNames.INTERCEPTED_NAMES); | |
| 42 jsAst.Expression mangledGlobalNamesAccess = | |
| 43 emitter.generateEmbeddedGlobalAccess(embeddedNames.MANGLED_GLOBAL_NAMES); | |
| 44 jsAst.Expression mangledNamesAccess = | |
| 45 emitter.generateEmbeddedGlobalAccess(embeddedNames.MANGLED_NAMES); | |
| 46 jsAst.Expression librariesAccess = | |
| 47 emitter.generateEmbeddedGlobalAccess(embeddedNames.LIBRARIES); | |
| 48 jsAst.Expression typesAccess = | |
| 49 emitter.generateEmbeddedGlobalAccess(embeddedNames.TYPES); | |
| 50 jsAst.Expression createNewIsolateFunctionAccess = | |
| 51 emitter.generateEmbeddedGlobalAccess(embeddedNames.CREATE_NEW_ISOLATE); | |
| 52 jsAst.Expression classIdExtractorAccess = | |
| 53 emitter.generateEmbeddedGlobalAccess(embeddedNames.CLASS_ID_EXTRACTOR); | |
| 54 jsAst.Expression allClassesAccess = | |
| 55 emitter.generateEmbeddedGlobalAccess(embeddedNames.ALL_CLASSES); | |
| 56 jsAst.Expression precompiledAccess = | |
| 57 emitter.generateEmbeddedGlobalAccess(embeddedNames.PRECOMPILED); | |
| 58 jsAst.Expression finishedClassesAccess = | |
| 59 emitter.generateEmbeddedGlobalAccess(embeddedNames.FINISHED_CLASSES); | |
| 60 jsAst.Expression interceptorsByTagAccess = | |
| 61 emitter.generateEmbeddedGlobalAccess(embeddedNames.INTERCEPTORS_BY_TAG); | |
| 62 jsAst.Expression leafTagsAccess = | |
| 63 emitter.generateEmbeddedGlobalAccess(embeddedNames.LEAF_TAGS); | |
| 64 jsAst.Expression initializeEmptyInstanceAccess = | |
| 65 emitter.generateEmbeddedGlobalAccess( | |
| 66 embeddedNames.INITIALIZE_EMPTY_INSTANCE); | |
| 67 jsAst.Expression classFieldsExtractorAccess = | |
| 68 emitter.generateEmbeddedGlobalAccess( | |
| 69 embeddedNames.CLASS_FIELDS_EXTRACTOR); | |
| 70 jsAst.Expression instanceFromClassIdAccess = | |
| 71 emitter.generateEmbeddedGlobalAccess( | |
| 72 embeddedNames.INSTANCE_FROM_CLASS_ID); | |
| 73 | |
| 74 String reflectableField = namer.reflectableField; | |
| 75 String reflectionInfoField = namer.reflectionInfoField; | |
| 76 String reflectionNameField = namer.reflectionNameField; | |
| 77 String metadataIndexField = namer.metadataIndexField; | |
| 78 String defaultValuesField = namer.defaultValuesField; | |
| 79 String methodsWithOptionalArgumentsField = | |
| 80 namer.methodsWithOptionalArgumentsField; | |
| 81 String unmangledNameIndex = backend.mustRetainMetadata | |
| 82 ? ' 3 * optionalParameterCount + 2 * requiredParameterCount + 3' | |
| 83 : ' 2 * optionalParameterCount + requiredParameterCount + 3'; | |
| 84 String receiverParamName = compiler.enableMinification ? "r" : "receiver"; | |
| 85 String valueParamName = compiler.enableMinification ? "v" : "value"; | |
| 86 String space = compiler.enableMinification ? "" : " "; | |
| 87 String _ = space; | |
| 88 | |
| 89 String specProperty = '"${namer.nativeSpecProperty}"'; // "%" | |
| 90 jsAst.Expression nativeInfoAccess = js('prototype[$specProperty]', []); | |
| 91 jsAst.Expression constructorAccess = js('constructor', []); | |
| 92 Function subclassReadGenerator = | |
| 93 (jsAst.Expression subclass) => js('allClasses[#]', subclass); | |
| 94 jsAst.Statement nativeInfoHandler = emitter. | |
| 95 buildNativeInfoHandler(nativeInfoAccess, constructorAccess, | |
| 96 subclassReadGenerator, interceptorsByTagAccess, | |
| 97 leafTagsAccess); | |
| 98 | |
| 99 Map<String, dynamic> holes = | |
| 100 {'needsClassSupport': emitter.needsClassSupport, | |
| 101 'libraries': librariesAccess, | |
| 102 'mangledNames': mangledNamesAccess, | |
| 103 'mangledGlobalNames': mangledGlobalNamesAccess, | |
| 104 'statics': staticsAccess, | |
| 105 'typeInformation': typeInformationAccess, | |
| 106 'globalFunctions': globalFunctionsAccess, | |
| 107 'enabledInvokeOn': compiler.enabledInvokeOn, | |
| 108 'interceptedNames': interceptedNamesAccess, | |
| 109 'interceptedNamesSet': emitter.generateInterceptedNamesSet(), | |
| 110 'notInCspMode': !compiler.useContentSecurityPolicy, | |
| 111 'inCspMode': compiler.useContentSecurityPolicy, | |
| 112 'deferredAction': namer.deferredAction, | |
| 113 'hasIsolateSupport': program.hasIsolateSupport, | |
| 114 'fieldNamesProperty': js.string(OldEmitter.FIELD_NAMES_PROPERTY_NAME), | |
| 115 'hasIncrementalSupport': compiler.hasIncrementalSupport, | |
| 116 'incrementalHelper': namer.accessIncrementalHelper, | |
| 117 'createNewIsolateFunction': createNewIsolateFunctionAccess, | |
| 118 'isolateName': namer.isolateName, | |
| 119 'classIdExtractor': classIdExtractorAccess, | |
| 120 'classFieldsExtractor': classFieldsExtractorAccess, | |
| 121 'instanceFromClassId': instanceFromClassIdAccess, | |
| 122 'initializeEmptyInstance': initializeEmptyInstanceAccess, | |
| 123 'allClasses': allClassesAccess, | |
| 124 'debugFastObjects': DEBUG_FAST_OBJECTS, | |
| 125 'isTreeShakingDisabled': backend.isTreeShakingDisabled, | |
| 126 'precompiled': precompiledAccess, | |
| 127 'finishedClassesAccess': finishedClassesAccess, | |
| 128 'needsMixinSupport': emitter.needsMixinSupport, | |
| 129 'needsNativeSupport': program.needsNativeSupport, | |
| 130 'isInterceptorClass': namer.operatorIs(backend.jsInterceptorClass), | |
| 131 'isObject' : namer.operatorIs(compiler.objectClass), | |
| 132 'specProperty': js.string(namer.nativeSpecProperty), | |
| 133 'trivialNsmHandlers': emitter.buildTrivialNsmHandlers(), | |
| 134 'hasRetainedMetadata': backend.hasRetainedMetadata, | |
| 135 'types': typesAccess, | |
| 136 'objectClassName': js.quoteName( | |
| 137 namer.runtimeTypeName(compiler.objectClass)), | |
| 138 'needsStructuredMemberInfo': emitter.needsStructuredMemberInfo, | |
| 139 'usesMangledNames': | |
| 140 compiler.mirrorsLibrary != null || compiler.enabledFunctionApply, | |
| 141 'tearOffCode': buildTearOffCode(backend), | |
| 142 'nativeInfoHandler': nativeInfoHandler, | |
| 143 'operatorIsPrefix' : js.string(namer.operatorIsPrefix), | |
| 144 'deferredActionString': js.string(namer.deferredAction)}; | |
| 145 | |
| 146 String skeleton = ''' | |
| 147 function $setupProgramName(programData, typesOffset) { | |
| 148 "use strict"; | |
| 149 if (#needsClassSupport) { | |
| 150 | |
| 151 function generateAccessor(fieldDescriptor, accessors, cls) { | |
| 152 var fieldInformation = fieldDescriptor.split("-"); | |
| 153 var field = fieldInformation[0]; | |
| 154 var len = field.length; | |
| 155 var code = field.charCodeAt(len - 1); | |
| 156 var reflectable; | |
| 157 if (fieldInformation.length > 1) reflectable = true; | |
| 158 else reflectable = false; | |
| 159 code = ((code >= $RANGE1_FIRST) && (code <= $RANGE1_LAST)) | |
| 160 ? code - $RANGE1_ADJUST | |
| 161 : ((code >= $RANGE2_FIRST) && (code <= $RANGE2_LAST)) | |
| 162 ? code - $RANGE2_ADJUST | |
| 163 : ((code >= $RANGE3_FIRST) && (code <= $RANGE3_LAST)) | |
| 164 ? code - $RANGE3_ADJUST | |
| 165 : $NO_FIELD_CODE; | |
| 166 | |
| 167 if (code) { // needsAccessor | |
| 168 var getterCode = code & 3; | |
| 169 var setterCode = code >> 2; | |
| 170 var accessorName = field = field.substring(0, len - 1); | |
| 171 | |
| 172 var divider = field.indexOf(":"); | |
| 173 if (divider > 0) { // Colon never in first position. | |
| 174 accessorName = field.substring(0, divider); | |
| 175 field = field.substring(divider + 1); | |
| 176 } | |
| 177 | |
| 178 if (getterCode) { // needsGetter | |
| 179 var args = (getterCode & 2) ? "$receiverParamName" : ""; | |
| 180 var receiver = (getterCode & 1) ? "this" : "$receiverParamName"; | |
| 181 var body = "return " + receiver + "." + field; | |
| 182 var property = | |
| 183 cls + ".prototype.${namer.getterPrefix}" + accessorName + "="; | |
| 184 var fn = "function(" + args + "){" + body + "}"; | |
| 185 if (reflectable) | |
| 186 accessors.push(property + "\$reflectable(" + fn + ");\\n"); | |
| 187 else | |
| 188 accessors.push(property + fn + ";\\n"); | |
| 189 } | |
| 190 | |
| 191 if (setterCode) { // needsSetter | |
| 192 var args = (setterCode & 2) | |
| 193 ? "$receiverParamName,${_}$valueParamName" | |
| 194 : "$valueParamName"; | |
| 195 var receiver = (setterCode & 1) ? "this" : "$receiverParamName"; | |
| 196 var body = receiver + "." + field + "$_=$_$valueParamName"; | |
| 197 var property = | |
| 198 cls + ".prototype.${namer.setterPrefix}" + accessorName + "="; | |
| 199 var fn = "function(" + args + "){" + body + "}"; | |
| 200 if (reflectable) | |
| 201 accessors.push(property + "\$reflectable(" + fn + ");\\n"); | |
| 202 else | |
| 203 accessors.push(property + fn + ";\\n"); | |
| 204 } | |
| 205 } | |
| 206 | |
| 207 return field; | |
| 208 } | |
| 209 | |
| 210 // First the class name, then the field names in an array and the members | |
| 211 // (inside an Object literal). | |
| 212 // The caller can also pass in the constructor as a function if needed. | |
| 213 // | |
| 214 // Example: | |
| 215 // defineClass("A", ["x", "y"], { | |
| 216 // foo\$1: function(y) { | |
| 217 // print(this.x + y); | |
| 218 // }, | |
| 219 // bar\$2: function(t, v) { | |
| 220 // this.x = t - v; | |
| 221 // }, | |
| 222 // }); | |
| 223 function defineClass(name, fields) { | |
| 224 var accessors = []; | |
| 225 | |
| 226 var str = "function " + name + "("; | |
| 227 var body = ""; | |
| 228 if (#hasIsolateSupport) { var fieldNames = ""; } | |
| 229 | |
| 230 for (var i = 0; i < fields.length; i++) { | |
| 231 if(i != 0) str += ", "; | |
| 232 | |
| 233 var field = generateAccessor(fields[i], accessors, name); | |
| 234 if (#hasIsolateSupport) { fieldNames += "'" + field + "',"; } | |
| 235 var parameter = "p_" + field; | |
| 236 str += parameter; | |
| 237 body += ("this." + field + " = " + parameter + ";\\n"); | |
| 238 } | |
| 239 if (supportsDirectProtoAccess) { | |
| 240 body += "this." + #deferredActionString + "();"; | |
| 241 } | |
| 242 str += ") {\\n" + body + "}\\n"; | |
| 243 str += name + ".$typeNameProperty=\\"" + name + "\\";\\n"; | |
| 244 str += "\$desc=\$collectedClasses." + name + "[1];\\n"; | |
| 245 str += name + ".prototype = \$desc;\\n"; | |
| 246 if (typeof defineClass.name != "string") { | |
| 247 str += name + ".name=\\"" + name + "\\";\\n"; | |
| 248 } | |
| 249 if (#hasIsolateSupport) { | |
| 250 str += name + "." + #fieldNamesProperty + "=[" + fieldNames | |
| 251 + "];\\n"; | |
| 252 } | |
| 253 str += accessors.join(""); | |
| 254 | |
| 255 return str; | |
| 256 } | |
| 257 | |
| 258 if (#hasIncrementalSupport) { | |
| 259 #incrementalHelper.defineClass = defineClass; | |
| 260 } | |
| 261 | |
| 262 if (#hasIsolateSupport) { | |
| 263 #createNewIsolateFunction = function() { return new #isolateName(); }; | |
| 264 | |
| 265 #classIdExtractor = function(o) { return o.constructor.name; }; | |
| 266 | |
| 267 #classFieldsExtractor = function(o) { | |
| 268 var fieldNames = o.constructor.#fieldNamesProperty; | |
| 269 if (!fieldNames) return []; // TODO(floitsch): do something else here. | |
| 270 var result = []; | |
| 271 result.length = fieldNames.length; | |
| 272 for (var i = 0; i < fieldNames.length; i++) { | |
| 273 result[i] = o[fieldNames[i]]; | |
| 274 } | |
| 275 return result; | |
| 276 }; | |
| 277 | |
| 278 #instanceFromClassId = function(name) { return new #allClasses[name](); }; | |
| 279 | |
| 280 #initializeEmptyInstance = function(name, o, fields) { | |
| 281 #allClasses[name].apply(o, fields); | |
| 282 return o; // | |
| 283 } | |
| 284 } | |
| 285 | |
| 286 // If the browser supports changing the prototype via __proto__, we make | |
| 287 // use of that feature. Otherwise, we copy the properties into a new | |
| 288 // constructor. | |
| 289 var inheritFrom = supportsDirectProtoAccess ? | |
| 290 function(constructor, superConstructor) { | |
| 291 var prototype = constructor.prototype; | |
| 292 prototype.__proto__ = superConstructor.prototype; | |
| 293 // Use a function for `true` here, as functions are stored in the | |
| 294 // hidden class and not as properties in the object. | |
| 295 prototype.constructor = constructor; | |
| 296 prototype[#operatorIsPrefix + constructor.name] = constructor; | |
| 297 return convertToFastObject(prototype); | |
| 298 } : | |
| 299 function() { | |
| 300 function tmp() {} | |
| 301 return function (constructor, superConstructor) { | |
| 302 tmp.prototype = superConstructor.prototype; | |
| 303 var object = new tmp(); | |
| 304 convertToSlowObject(object); | |
| 305 var properties = constructor.prototype; | |
| 306 var members = Object.keys(properties); | |
| 307 for (var i = 0; i < members.length; i++) { | |
| 308 var member = members[i]; | |
| 309 object[member] = properties[member]; | |
| 310 } | |
| 311 // Use a function for `true` here, as functions are stored in the | |
| 312 // hidden class and not as properties in the object. | |
| 313 object[#operatorIsPrefix + constructor.name] = constructor; | |
| 314 object.constructor = constructor; | |
| 315 constructor.prototype = object; | |
| 316 return object; | |
| 317 }; | |
| 318 }(); | |
| 319 | |
| 320 if (#hasIncrementalSupport) { | |
| 321 #incrementalHelper.inheritFrom = inheritFrom; | |
| 322 } | |
| 323 | |
| 324 // Class descriptions are collected in a JS object. | |
| 325 // 'finishClasses' takes all collected descriptions and sets up | |
| 326 // the prototype. | |
| 327 // Once set up, the constructors prototype field satisfy: | |
| 328 // - it contains all (local) members. | |
| 329 // - its internal prototype (__proto__) points to the superclass' | |
| 330 // prototype field. | |
| 331 // - the prototype's constructor field points to the JavaScript | |
| 332 // constructor. | |
| 333 // For engines where we have access to the '__proto__' we can manipulate | |
| 334 // the object literal directly. For other engines we have to create a new | |
| 335 // object and copy over the members. | |
| 336 function finishClasses(processedClasses) { | |
| 337 if (#debugFastObjects) | |
| 338 print("Number of classes: " + | |
| 339 Object.getOwnPropertyNames(processedClasses.collected).length); | |
| 340 | |
| 341 var allClasses = #allClasses; | |
| 342 | |
| 343 if (#inCspMode) { | |
| 344 var constructors = #precompiled(processedClasses.collected); | |
| 345 } | |
| 346 | |
| 347 if (#notInCspMode) { | |
| 348 processedClasses.combinedConstructorFunction += | |
| 349 "return [\\n" + processedClasses.constructorsList.join(",\\n ") + | |
| 350 "\\n]"; | |
| 351 var constructors = | |
| 352 new Function("\$collectedClasses", | |
| 353 processedClasses.combinedConstructorFunction) | |
| 354 (processedClasses.collected); | |
| 355 processedClasses.combinedConstructorFunction = null; | |
| 356 } | |
| 357 | |
| 358 for (var i = 0; i < constructors.length; i++) { | |
| 359 var constructor = constructors[i]; | |
| 360 var cls = constructor.name; | |
| 361 var desc = processedClasses.collected[cls]; | |
| 362 var globalObject = desc[0]; | |
| 363 desc = desc[1]; | |
| 364 if (#isTreeShakingDisabled) | |
| 365 constructor["${namer.metadataField}"] = desc; | |
| 366 allClasses[cls] = constructor; | |
| 367 globalObject[cls] = constructor; | |
| 368 } | |
| 369 constructors = null; | |
| 370 | |
| 371 var finishedClasses = #finishedClassesAccess; | |
| 372 | |
| 373 function finishClass(cls) { | |
| 374 | |
| 375 if (finishedClasses[cls]) return; | |
| 376 finishedClasses[cls] = true; | |
| 377 | |
| 378 var superclass = processedClasses.pending[cls]; | |
| 379 | |
| 380 if (#needsMixinSupport) { | |
| 381 if (superclass && superclass.indexOf("+") > 0) { | |
| 382 var s = superclass.split("+"); | |
| 383 superclass = s[0]; | |
| 384 var mixinClass = s[1]; | |
| 385 finishClass(mixinClass); | |
| 386 var mixin = allClasses[mixinClass]; | |
| 387 var mixinPrototype = mixin.prototype; | |
| 388 var clsPrototype = allClasses[cls].prototype; | |
| 389 | |
| 390 var properties = Object.keys(mixinPrototype); | |
| 391 for (var i = 0; i < properties.length; i++) { | |
| 392 var d = properties[i]; | |
| 393 if (!hasOwnProperty.call(clsPrototype, d)) | |
| 394 clsPrototype[d] = mixinPrototype[d]; | |
| 395 } | |
| 396 } | |
| 397 } | |
| 398 | |
| 399 // The superclass is only false (empty string) for the Dart Object | |
| 400 // class. The minifier together with noSuchMethod can put methods on | |
| 401 // the Object.prototype object, and they show through here, so we check | |
| 402 // that we have a string. | |
| 403 if (!superclass || typeof superclass != "string") { | |
| 404 // Inlined special case of InheritFrom here for performance reasons. | |
| 405 // Fix up the the Dart Object class' prototype. | |
| 406 var constructor = allClasses[cls]; | |
| 407 var prototype = constructor.prototype; | |
| 408 prototype.constructor = constructor; | |
| 409 prototype.#isObject = constructor; | |
| 410 prototype.#deferredAction = function() {}; | |
| 411 return; | |
| 412 } | |
| 413 finishClass(superclass); | |
| 414 var superConstructor = allClasses[superclass]; | |
| 415 | |
| 416 if (!superConstructor) { | |
| 417 superConstructor = existingIsolateProperties[superclass]; | |
| 418 } | |
| 419 | |
| 420 var constructor = allClasses[cls]; | |
| 421 var prototype = inheritFrom(constructor, superConstructor); | |
| 422 | |
| 423 if (#needsMixinSupport) { | |
| 424 if (mixinPrototype) { | |
| 425 prototype.#deferredAction | |
| 426 = mixinDeferredActionHelper(mixinPrototype, prototype); | |
| 427 } | |
| 428 } | |
| 429 | |
| 430 if (#needsNativeSupport) { | |
| 431 if (Object.prototype.hasOwnProperty.call(prototype, #specProperty)) { | |
| 432 #nativeInfoHandler; | |
| 433 // As native classes can come into existence without a constructor | |
| 434 // call, we have to ensure that the class has been fully | |
| 435 // initialized. | |
| 436 prototype.#deferredAction(); | |
| 437 } | |
| 438 } | |
| 439 // Interceptors (or rather their prototypes) are also used without | |
| 440 // first instantiating them first. | |
| 441 if (prototype.#isInterceptorClass) { | |
| 442 prototype.#deferredAction(); | |
| 443 } | |
| 444 } | |
| 445 | |
| 446 #trivialNsmHandlers; | |
| 447 | |
| 448 var properties = Object.keys(processedClasses.pending); | |
| 449 for (var i = 0; i < properties.length; i++) finishClass(properties[i]); | |
| 450 } | |
| 451 | |
| 452 // Generic handler for deferred class setup. The handler updates the | |
| 453 // prototype that it is installed on (it traverses the prototype chain | |
| 454 // of [this] to find itself) and then removes itself. It recurses by | |
| 455 // calling deferred handling again, which terminates on Object due to | |
| 456 // the final handler. | |
| 457 function finishAddStubsHelper() { | |
| 458 var prototype = this; | |
| 459 // Find the actual prototype that this handler is installed on. | |
| 460 while (!prototype.hasOwnProperty(#deferredActionString)) { | |
| 461 prototype = prototype.__proto__; | |
| 462 } | |
| 463 delete prototype.#deferredAction; // Intended to make it slow, too. | |
| 464 var properties = Object.keys(prototype); | |
| 465 for (var index = 0; index < properties.length; index++) { | |
| 466 var property = properties[index]; | |
| 467 var firstChar = property.charCodeAt(0); | |
| 468 var elem; | |
| 469 // We have to filter out some special properties that are used for | |
| 470 // metadata in descriptors. Currently, we filter everything that | |
| 471 // starts with + or *. This has to stay in sync with the special | |
| 472 // properties that are used by processClassData below. | |
| 473 if (property !== "${namer.classDescriptorProperty}" && | |
| 474 property !== "$reflectableField" && | |
| 475 firstChar !== 43 && // 43 is aka "+". | |
| 476 firstChar !== 42 && // 42 is aka "*" | |
| 477 (elem = prototype[property]) != null && | |
| 478 elem.constructor === Array && | |
| 479 property !== "<>") { | |
| 480 addStubs(prototype, elem, property, false, []); | |
| 481 } | |
| 482 } | |
| 483 convertToFastObject(prototype); | |
| 484 prototype = prototype.__proto__; | |
| 485 // Call other handlers. | |
| 486 prototype.#deferredAction(); | |
| 487 } | |
| 488 | |
| 489 if (#needsMixinSupport) { | |
| 490 // Returns a deferred class setup handler that first invokes the | |
| 491 // handler on [mixinPrototype] and then resumes handling on | |
| 492 // [targetPrototype]. If [targetPrototype] already has a handler | |
| 493 // installed, the handler is preserved in the generated closure and | |
| 494 // thus can be safely overwritten. | |
| 495 function mixinDeferredActionHelper(mixinPrototype, targetPrototype) { | |
| 496 var chain; | |
| 497 if (targetPrototype.hasOwnProperty(#deferredActionString)) { | |
| 498 chain = targetPrototype.#deferredAction; | |
| 499 } | |
| 500 return function foo() { | |
| 501 var prototype = this; | |
| 502 // Find the actual prototype that this handler is installed on. | |
| 503 while (!prototype.hasOwnProperty(#deferredActionString)) { | |
| 504 prototype = prototype.__proto__; | |
| 505 } | |
| 506 if (chain) { | |
| 507 prototype.#deferredAction = chain; | |
| 508 } else { | |
| 509 delete prototype.#deferredAction; | |
| 510 convertToFastObject(prototype); | |
| 511 } | |
| 512 mixinPrototype.#deferredAction(); | |
| 513 prototype.#deferredAction(); | |
| 514 } | |
| 515 } | |
| 516 } | |
| 517 | |
| 518 function processClassData(cls, descriptor, processedClasses) { | |
| 519 descriptor = convertToSlowObject(descriptor); // Use a slow object. | |
| 520 var previousProperty; | |
| 521 var properties = Object.keys(descriptor); | |
| 522 var hasDeferredWork = false; | |
| 523 var shouldDeferWork = | |
| 524 supportsDirectProtoAccess && cls != #objectClassName; | |
| 525 for (var i = 0; i < properties.length; i++) { | |
| 526 var property = properties[i]; | |
| 527 var firstChar = property.charCodeAt(0); | |
| 528 if (property === "static") { | |
| 529 processStatics(#statics[cls] = descriptor.static, | |
| 530 processedClasses); | |
| 531 delete descriptor.static; | |
| 532 } else if (firstChar === 43) { // 43 is "+". | |
| 533 mangledNames[previousProperty] = property.substring(1); | |
| 534 var flag = descriptor[property]; | |
| 535 if (flag > 0) | |
| 536 descriptor[previousProperty].$reflectableField = flag; | |
| 537 } else if (firstChar === 42) { // 42 is "*" | |
| 538 descriptor[previousProperty].$defaultValuesField = | |
| 539 descriptor[property]; | |
| 540 var optionalMethods = descriptor.$methodsWithOptionalArgumentsField; | |
| 541 if (!optionalMethods) { | |
| 542 descriptor.$methodsWithOptionalArgumentsField = optionalMethods={} | |
| 543 } | |
| 544 optionalMethods[property] = previousProperty; | |
| 545 } else { | |
| 546 var elem = descriptor[property]; | |
| 547 if (property !== "${namer.classDescriptorProperty}" && | |
| 548 elem != null && | |
| 549 elem.constructor === Array && | |
| 550 property !== "<>") { | |
| 551 if (shouldDeferWork) { | |
| 552 hasDeferredWork = true; | |
| 553 } else { | |
| 554 addStubs(descriptor, elem, property, false, []); | |
| 555 } | |
| 556 } else { | |
| 557 previousProperty = property; | |
| 558 } | |
| 559 } | |
| 560 } | |
| 561 | |
| 562 if (hasDeferredWork) | |
| 563 descriptor.#deferredAction = finishAddStubsHelper; | |
| 564 | |
| 565 /* The 'fields' are either a constructor function or a | |
| 566 * string encoding fields, constructor and superclass. Gets the | |
| 567 * superclass and fields in the format | |
| 568 * 'Super;field1,field2' | |
| 569 * from the CLASS_DESCRIPTOR_PROPERTY property on the descriptor. | |
| 570 */ | |
| 571 var classData = descriptor["${namer.classDescriptorProperty}"], | |
| 572 split, supr, fields = classData; | |
| 573 | |
| 574 if (#hasRetainedMetadata) | |
| 575 if (typeof classData == "object" && | |
| 576 classData instanceof Array) { | |
| 577 classData = fields = classData[0]; | |
| 578 } | |
| 579 // ${ClassBuilder.fieldEncodingDescription}. | |
| 580 var s = fields.split(";"); | |
| 581 fields = s[1] ? s[1].split(",") : []; | |
| 582 supr = s[0]; | |
| 583 // ${ClassBuilder.functionTypeEncodingDescription}. | |
| 584 split = supr.split(":"); | |
| 585 if (split.length == 2) { | |
| 586 supr = split[0]; | |
| 587 var functionSignature = split[1]; | |
| 588 if (functionSignature) | |
| 589 descriptor.${namer.operatorSignature} = function(s) { | |
| 590 return function() { | |
| 591 return #types[s]; | |
| 592 }; | |
| 593 }(functionSignature); | |
| 594 } | |
| 595 | |
| 596 if (supr) processedClasses.pending[cls] = supr; | |
| 597 if (#notInCspMode) { | |
| 598 processedClasses.combinedConstructorFunction += | |
| 599 defineClass(cls, fields); | |
| 600 processedClasses.constructorsList.push(cls); | |
| 601 } | |
| 602 processedClasses.collected[cls] = [globalObject, descriptor]; | |
| 603 classes.push(cls); | |
| 604 } | |
| 605 } | |
| 606 | |
| 607 function processStatics(descriptor, processedClasses) { | |
| 608 var properties = Object.keys(descriptor); | |
| 609 for (var i = 0; i < properties.length; i++) { | |
| 610 var property = properties[i]; | |
| 611 if (property === "${namer.classDescriptorProperty}") continue; | |
| 612 var element = descriptor[property]; | |
| 613 var firstChar = property.charCodeAt(0); | |
| 614 var previousProperty; | |
| 615 if (firstChar === 43) { // 43 is "+". | |
| 616 mangledGlobalNames[previousProperty] = property.substring(1); | |
| 617 var flag = descriptor[property]; | |
| 618 if (flag > 0) | |
| 619 descriptor[previousProperty].$reflectableField = flag; | |
| 620 if (element && element.length) | |
| 621 #typeInformation[previousProperty] = element; | |
| 622 } else if (firstChar === 42) { // 42 is "*" | |
| 623 globalObject[previousProperty].$defaultValuesField = element; | |
| 624 var optionalMethods = descriptor.$methodsWithOptionalArgumentsField; | |
| 625 if (!optionalMethods) { | |
| 626 descriptor.$methodsWithOptionalArgumentsField = optionalMethods = {} | |
| 627 } | |
| 628 optionalMethods[property] = previousProperty; | |
| 629 } else if (typeof element === "function") { | |
| 630 globalObject[previousProperty = property] = element; | |
| 631 functions.push(property); | |
| 632 #globalFunctions[property] = element; | |
| 633 } else if (element.constructor === Array) { | |
| 634 if (#needsStructuredMemberInfo) { | |
| 635 addStubs(globalObject, element, property, true, functions); | |
| 636 } | |
| 637 } else { | |
| 638 // We will not enter this case if no classes are defined. | |
| 639 if (#needsClassSupport) { | |
| 640 previousProperty = property; | |
| 641 processClassData(property, element, processedClasses); | |
| 642 } | |
| 643 } | |
| 644 } | |
| 645 } | |
| 646 | |
| 647 if (#needsStructuredMemberInfo) { | |
| 648 | |
| 649 // See [dart2js.js_emitter.ContainerBuilder.addMemberMethod] for format of | |
| 650 // [array]. | |
| 651 | |
| 652 // Processes the stub declaration given by [array] and stores the results | |
| 653 // in the corresponding [prototype]. [name] is the property name in | |
| 654 // [prototype] that the stub declaration belongs to. | |
| 655 // If [isStatic] is true, the property being processed belongs to a static | |
| 656 // function and thus is stored as a global. In that case we also add all | |
| 657 // generated functions to the [functions] array, which is used by the | |
| 658 // mirrors system to enumerate all static functions of a library. For | |
| 659 // non-static functions we might still add some functions to [functions] but | |
| 660 // the information is thrown away at the call site. This is to avoid | |
| 661 // conditionals. | |
| 662 function addStubs(prototype, array, name, isStatic, functions) { | |
| 663 var index = $FUNCTION_INDEX, alias = array[index], f; | |
| 664 if (typeof alias == "string") { | |
| 665 f = array[++index]; | |
| 666 } else { | |
| 667 f = alias; | |
| 668 alias = name; | |
| 669 } | |
| 670 var funcs = [prototype[name] = prototype[alias] = f]; | |
| 671 f.\$stubName = name; | |
| 672 functions.push(name); | |
| 673 for (index++; index < array.length; index++) { | |
| 674 f = array[index]; | |
| 675 if (typeof f != "function") break; | |
| 676 if (!isStatic) { | |
| 677 f.\$stubName = ${readString("array", "++index")}; | |
| 678 } | |
| 679 funcs.push(f); | |
| 680 if (f.\$stubName) { | |
| 681 prototype[f.\$stubName] = f; | |
| 682 functions.push(f.\$stubName); | |
| 683 } | |
| 684 } | |
| 685 | |
| 686 for (var i = 0; i < funcs.length; index++, i++) { | |
| 687 funcs[i].\$callName = ${readString("array", "index")}; | |
| 688 } | |
| 689 var getterStubName = ${readString("array", "index")}; | |
| 690 array = array.slice(++index); | |
| 691 var requiredParameterInfo = ${readInt("array", "0")}; | |
| 692 var requiredParameterCount = requiredParameterInfo >> 1; | |
| 693 var isAccessor = (requiredParameterInfo & 1) === 1; | |
| 694 var isSetter = requiredParameterInfo === 3; | |
| 695 var isGetter = requiredParameterInfo === 1; | |
| 696 var optionalParameterInfo = ${readInt("array", "1")}; | |
| 697 var optionalParameterCount = optionalParameterInfo >> 1; | |
| 698 var optionalParametersAreNamed = (optionalParameterInfo & 1) === 1; | |
| 699 var isIntercepted = | |
| 700 requiredParameterCount + optionalParameterCount != funcs[0].length; | |
| 701 var functionTypeIndex = ${readFunctionType("array", "2")}; | |
| 702 if (typeof functionTypeIndex == "number") | |
| 703 ${readFunctionType("array", "2")} = functionTypeIndex + typesOffset; | |
| 704 var unmangledNameIndex = $unmangledNameIndex; | |
| 705 | |
| 706 if (getterStubName) { | |
| 707 f = tearOff(funcs, array, isStatic, name, isIntercepted); | |
| 708 prototype[name].\$getter = f; | |
| 709 f.\$getterStub = true; | |
| 710 // Used to create an isolate using spawnFunction. | |
| 711 if (isStatic) { | |
| 712 #globalFunctions[name] = f; | |
| 713 functions.push(getterStubName); | |
| 714 } | |
| 715 prototype[getterStubName] = f; | |
| 716 funcs.push(f); | |
| 717 f.\$stubName = getterStubName; | |
| 718 f.\$callName = null; | |
| 719 // Update the interceptedNames map (which only exists if `invokeOn` was | |
| 720 // enabled). | |
| 721 if (#enabledInvokeOn) | |
| 722 if (isIntercepted) #interceptedNames[getterStubName] = 1; | |
| 723 } | |
| 724 | |
| 725 if (#usesMangledNames) { | |
| 726 var isReflectable = array.length > unmangledNameIndex; | |
| 727 if (isReflectable) { | |
| 728 funcs[0].$reflectableField = 1; | |
| 729 funcs[0].$reflectionInfoField = array; | |
| 730 for (var i = 1; i < funcs.length; i++) { | |
| 731 funcs[i].$reflectableField = 2; | |
| 732 funcs[i].$reflectionInfoField = array; | |
| 733 } | |
| 734 var mangledNames = isStatic ? #mangledGlobalNames : #mangledNames; | |
| 735 var unmangledName = ${readString("array", "unmangledNameIndex")}; | |
| 736 // The function is either a getter, a setter, or a method. | |
| 737 // If it is a method, it might also have a tear-off closure. | |
| 738 // The unmangledName is the same as the getter-name. | |
| 739 var reflectionName = unmangledName; | |
| 740 if (getterStubName) mangledNames[getterStubName] = reflectionName; | |
| 741 if (isSetter) { | |
| 742 reflectionName += "="; | |
| 743 } else if (!isGetter) { | |
| 744 reflectionName += ":" + | |
| 745 (requiredParameterCount + optionalParameterCount); | |
| 746 } | |
| 747 mangledNames[name] = reflectionName; | |
| 748 funcs[0].$reflectionNameField = reflectionName; | |
| 749 funcs[0].$metadataIndexField = unmangledNameIndex + 1; | |
| 750 if (optionalParameterCount) prototype[unmangledName + "*"] = funcs[0]; | |
| 751 } | |
| 752 } | |
| 753 } | |
| 754 | |
| 755 #tearOffCode; | |
| 756 } | |
| 757 | |
| 758 if (#hasIncrementalSupport) { | |
| 759 #incrementalHelper.addStubs = addStubs; | |
| 760 } | |
| 761 | |
| 762 var functionCounter = 0; | |
| 763 if (!#libraries) #libraries = []; | |
| 764 if (!#mangledNames) #mangledNames = map(); | |
| 765 if (!#mangledGlobalNames) #mangledGlobalNames = map(); | |
| 766 if (!#statics) #statics = map(); | |
| 767 if (!#typeInformation) #typeInformation = map(); | |
| 768 if (!#globalFunctions) #globalFunctions = map(); | |
| 769 if (#enabledInvokeOn) | |
| 770 if (!#interceptedNames) #interceptedNames = #interceptedNamesSet; | |
| 771 var libraries = #libraries; | |
| 772 var mangledNames = #mangledNames; | |
| 773 var mangledGlobalNames = #mangledGlobalNames; | |
| 774 var hasOwnProperty = Object.prototype.hasOwnProperty; | |
| 775 var length = programData.length; | |
| 776 var processedClasses = map(); | |
| 777 processedClasses.collected = map(); | |
| 778 processedClasses.pending = map(); | |
| 779 if (#notInCspMode) { | |
| 780 processedClasses.constructorsList = []; | |
| 781 // For every class processed [processedClasses.combinedConstructorFunction] | |
| 782 // will be updated with the corresponding constructor function. | |
| 783 processedClasses.combinedConstructorFunction = | |
| 784 "function \$reflectable(fn){fn.$reflectableField=1;return fn};\\n"+ | |
| 785 "var \$desc;\\n"; | |
| 786 } | |
| 787 for (var i = 0; i < length; i++) { | |
| 788 var data = programData[i]; | |
| 789 | |
| 790 // [data] contains these elements: | |
| 791 // 0. The library name (not unique). | |
| 792 // 1. The library URI (unique). | |
| 793 // 2. A function returning the metadata associated with this library. | |
| 794 // 3. The global object to use for this library. | |
| 795 // 4. An object literal listing the members of the library. | |
| 796 // 5. This element is optional and if present it is true and signals that this | |
| 797 // library is the root library (see dart:mirrors IsolateMirror.rootLibrary). | |
| 798 // | |
| 799 // The entries of [data] are built in [assembleProgram] above. | |
| 800 | |
| 801 var name = data[0]; | |
| 802 var uri = data[1]; | |
| 803 var metadata = data[2]; | |
| 804 var globalObject = data[3]; | |
| 805 var descriptor = data[4]; | |
| 806 var isRoot = !!data[5]; | |
| 807 var fields = descriptor && descriptor["${namer.classDescriptorProperty}"]; | |
| 808 if (fields instanceof Array) fields = fields[0]; | |
| 809 var classes = []; | |
| 810 var functions = []; | |
| 811 processStatics(descriptor, processedClasses); | |
| 812 libraries.push([name, uri, classes, functions, metadata, fields, isRoot, | |
| 813 globalObject]); | |
| 814 } | |
| 815 if (#needsClassSupport) finishClasses(processedClasses); | |
| 816 }'''; | |
| 817 | |
| 818 // TODO(zarah): Remove empty else branches in output when if(#hole) is false. | |
| 819 return js.statement(skeleton, holes); | |
| 820 } | |
| 821 | |
| 822 String readString(String array, String index) { | |
| 823 return readChecked( | |
| 824 array, index, 'result != null && typeof result != "string"', 'string'); | |
| 825 } | |
| 826 | |
| 827 String readInt(String array, String index) { | |
| 828 return readChecked( | |
| 829 array, index, | |
| 830 'result != null && (typeof result != "number" || (result|0) !== result)', | |
| 831 'int'); | |
| 832 } | |
| 833 | |
| 834 String readFunctionType(String array, String index) { | |
| 835 return readChecked( | |
| 836 array, index, | |
| 837 'result != null && ' | |
| 838 '(typeof result != "number" || (result|0) !== result) && ' | |
| 839 'typeof result != "function"', | |
| 840 'function or int'); | |
| 841 } | |
| 842 | |
| 843 String readChecked(String array, String index, String check, String type) { | |
| 844 if (!VALIDATE_DATA) return '$array[$index]'; | |
| 845 return ''' | |
| 846 (function() { | |
| 847 var result = $array[$index]; | |
| 848 if ($check) { | |
| 849 throw new Error( | |
| 850 name + ": expected value of type \'$type\' at index " + ($index) + | |
| 851 " but got " + (typeof result)); | |
| 852 } | |
| 853 return result; | |
| 854 })()'''; | |
| 855 } | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1220333003:
dart2js: Rename emitters. (Closed)
Base URL: git@github.com:dart-lang/sdk.git@master