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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 /** | |
| 6 * This part contains helpers for supporting runtime type information. | |
| 7 * | |
| 8 * The helper use a mixture of Dart and JavaScript objects. To indicate which is | |
| 9 * used where we adopt the scheme of using explicit type annotation for Dart | |
| 10 * objects and 'var' or omitted return type for JavaScript objects. | |
| 11 * | |
| 12 * Since bool, int, and String values are represented by the same JavaScript | |
| 13 * primitives, type annotations are used for these types in all cases. | |
| 14 * | |
| 15 * Several methods use a common JavaScript encoding of runtime type information. | |
| 16 * This encoding is referred to as the type representation which is one of | |
| 17 * these: | |
| 18 * 1) a JavaScript constructor for a class C: the represented type is the raw | |
| 19 * type C. | |
| 20 * 2) a JavaScript array: the first entry is of type 1 and contains the | |
| 21 * subtyping flags and the substitution of the type and the rest of the | |
| 22 * array are the type arguments. | |
| 23 * 3) `null`: the dynamic type. | |
| 24 * 4) a JavaScript object representing the function type. For instance, it has | |
| 25 * the form {ret: rti, args: [rti], opt: [rti], named: {name: rti}} for a | |
| 26 * function with a return type, regular, optional and named arguments. | |
| 27 * | |
| 28 * To check subtype relations between generic classes we use a JavaScript | |
| 29 * expression that describes the necessary substitution for type arguments. | |
| 30 * Such a substitution expresssion can be: | |
| 31 * 1) `null`, if no substituted check is necessary, because the | |
| 32 * type variables are the same or there are no type variables in the class | |
| 33 * that is checked for. | |
| 34 * 2) A list expression describing the type arguments to be used in the | |
| 35 * subtype check, if the type arguments to be used in the check do not | |
| 36 * depend on the type arguments of the object. | |
| 37 * 3) A function mapping the type variables of the object to be checked to | |
| 38 * a list expression. The function may also return null, which is equivalent | |
| 39 * to an array containing only null values. | |
| 40 */ | |
| 41 | |
| 42 part of _js_helper; | |
| 43 | |
| 44 Type createRuntimeType(String name) => new TypeImpl(name); | |
| 45 | |
| 46 class TypeImpl implements Type { | |
| 47 final String _typeName; | |
| 48 String _unmangledName; | |
| 49 | |
| 50 TypeImpl(this._typeName); | |
| 51 | |
| 52 String toString() { | |
| 53 if (_unmangledName != null) return _unmangledName; | |
| 54 String unmangledName = | |
| 55 unmangleAllIdentifiersIfPreservedAnyways(_typeName); | |
| 56 return _unmangledName = unmangledName; | |
| 57 } | |
| 58 | |
| 59 // TODO(ahe): This is a poor hashCode as it collides with its name. | |
| 60 int get hashCode => _typeName.hashCode; | |
| 61 | |
| 62 bool operator ==(other) { | |
| 63 return (other is TypeImpl) && _typeName == other._typeName; | |
| 64 } | |
| 65 } | |
| 66 | |
| 67 /** | |
| 68 * Represents a type variable. | |
| 69 * | |
| 70 * This class holds the information needed when reflecting on generic classes | |
| 71 * and their members. | |
| 72 */ | |
| 73 class TypeVariable { | |
| 74 final Type owner; | |
| 75 final String name; | |
| 76 final int bound; | |
| 77 | |
| 78 const TypeVariable(this.owner, this.name, this.bound); | |
| 79 } | |
| 80 | |
| 81 getMangledTypeName(TypeImpl type) => type._typeName; | |
| 82 | |
| 83 /** | |
| 84 * Sets the runtime type information on [target]. [rti] is a type | |
| 85 * representation of type 4 or 5, that is, either a JavaScript array or | |
| 86 * `null`. | |
| 87 */ | |
| 88 Object setRuntimeTypeInfo(Object target, var rti) { | |
| 89 assert(rti == null || isJsArray(rti)); | |
| 90 // We have to check for null because factories may return null. | |
| 91 if (target != null) JS('var', r'#.$builtinTypeInfo = #', target, rti); | |
| 92 return target; | |
| 93 } | |
| 94 | |
| 95 /** | |
| 96 * Returns the runtime type information of [target]. The returned value is a | |
| 97 * list of type representations for the type arguments. | |
| 98 */ | |
| 99 getRuntimeTypeInfo(Object target) { | |
| 100 if (target == null) return null; | |
| 101 return JS('var', r'#.$builtinTypeInfo', target); | |
| 102 } | |
| 103 | |
| 104 /** | |
| 105 * Returns the type arguments of [target] as an instance of [substitutionName]. | |
| 106 */ | |
| 107 getRuntimeTypeArguments(target, substitutionName) { | |
| 108 var substitution = getField(target, | |
| 109 '${JS_GET_NAME(JsGetName.OPERATOR_AS_PREFIX)}$substitutionName'); | |
| 110 return substitute(substitution, getRuntimeTypeInfo(target)); | |
| 111 } | |
| 112 | |
| 113 /** | |
| 114 * Returns the [index]th type argument of [target] as an instance of | |
| 115 * [substitutionName]. | |
| 116 */ | |
| 117 @NoThrows() @NoSideEffects() @NoInline() | |
| 118 getRuntimeTypeArgument(Object target, String substitutionName, int index) { | |
| 119 var arguments = getRuntimeTypeArguments(target, substitutionName); | |
| 120 return arguments == null ? null : getIndex(arguments, index); | |
| 121 } | |
| 122 | |
| 123 @NoThrows() @NoSideEffects() @NoInline() | |
| 124 getTypeArgumentByIndex(Object target, int index) { | |
| 125 var rti = getRuntimeTypeInfo(target); | |
| 126 return rti == null ? null : getIndex(rti, index); | |
| 127 } | |
| 128 | |
| 129 void copyTypeArguments(Object source, Object target) { | |
| 130 JS('var', r'#.$builtinTypeInfo = #.$builtinTypeInfo', target, source); | |
| 131 } | |
| 132 | |
| 133 /** | |
| 134 * Retrieves the class name from type information stored on the constructor | |
| 135 * of [object]. | |
| 136 */ | |
| 137 String getClassName(var object) { | |
| 138 return rawRtiToJsConstructorName(getRawRuntimeType(getInterceptor(object))); | |
| 139 } | |
| 140 | |
| 141 /** | |
| 142 * Creates the string representation for the type representation [rti] | |
| 143 * of type 4, the JavaScript array, where the first element represents the class | |
| 144 * and the remaining elements represent the type arguments. | |
| 145 */ | |
| 146 String getRuntimeTypeAsString(var rti, {String onTypeVariable(int i)}) { | |
| 147 assert(isJsArray(rti)); | |
| 148 String className = rawRtiToJsConstructorName(getIndex(rti, 0)); | |
| 149 return '$className${joinArguments(rti, 1, onTypeVariable: onTypeVariable)}'; | |
| 150 } | |
| 151 | |
| 152 /** | |
| 153 * Returns a human-readable representation of the type representation [rti]. | |
| 154 */ | |
| 155 String runtimeTypeToString(var rti, {String onTypeVariable(int i)}) { | |
| 156 if (rti == null) { | |
| 157 return 'dynamic'; | |
| 158 } else if (isJsArray(rti)) { | |
| 159 // A list representing a type with arguments. | |
| 160 return getRuntimeTypeAsString(rti, onTypeVariable: onTypeVariable); | |
| 161 } else if (isJsFunction(rti)) { | |
| 162 // A reference to the constructor. | |
| 163 return rawRtiToJsConstructorName(rti); | |
| 164 } else if (rti is int) { | |
| 165 if (onTypeVariable == null) { | |
| 166 return rti.toString(); | |
| 167 } else { | |
| 168 return onTypeVariable(rti); | |
| 169 } | |
| 170 } else { | |
| 171 // TODO(ahe): Handle function types, and be sure to always return a string. | |
| 172 return null; | |
| 173 } | |
| 174 } | |
| 175 | |
| 176 /** | |
| 177 * Creates a comma-separated string of human-readable representations of the | |
| 178 * type representations in the JavaScript array [types] starting at index | |
| 179 * [startIndex]. | |
| 180 */ | |
| 181 String joinArguments(var types, int startIndex, | |
| 182 {String onTypeVariable(int i)}) { | |
| 183 if (types == null) return ''; | |
| 184 assert(isJsArray(types)); | |
| 185 bool firstArgument = true; | |
| 186 bool allDynamic = true; | |
| 187 StringBuffer buffer = new StringBuffer(); | |
| 188 for (int index = startIndex; index < getLength(types); index++) { | |
| 189 if (firstArgument) { | |
| 190 firstArgument = false; | |
| 191 } else { | |
| 192 buffer.write(', '); | |
| 193 } | |
| 194 var argument = getIndex(types, index); | |
| 195 if (argument != null) { | |
| 196 allDynamic = false; | |
| 197 } | |
| 198 buffer.write(runtimeTypeToString(argument, onTypeVariable: onTypeVariable)); | |
| 199 } | |
| 200 return allDynamic ? '' : '<$buffer>'; | |
| 201 } | |
| 202 | |
| 203 /** | |
| 204 * Returns a human-readable representation of the type of [object]. | |
| 205 * | |
| 206 * In minified mode does *not* use unminified identifiers (even when present). | |
| 207 */ | |
| 208 String getRuntimeTypeString(var object) { | |
| 209 String className = getClassName(object); | |
| 210 if (object == null) return className; | |
| 211 var rti = JS('var', r'#.$builtinTypeInfo', object); | |
| 212 return "$className${joinArguments(rti, 0)}"; | |
| 213 } | |
| 214 | |
| 215 Type getRuntimeType(var object) { | |
| 216 String type = getRuntimeTypeString(object); | |
| 217 return new TypeImpl(type); | |
| 218 } | |
| 219 | |
| 220 /** | |
| 221 * Applies the [substitution] on the [arguments]. | |
| 222 * | |
| 223 * See the comment in the beginning of this file for a description of the | |
| 224 * possible values for [substitution]. | |
| 225 */ | |
| 226 substitute(var substitution, var arguments) { | |
| 227 assert(substitution == null || | |
| 228 isJsFunction(substitution)); | |
| 229 assert(arguments == null || isJsArray(arguments)); | |
| 230 if (isJsFunction(substitution)) { | |
| 231 substitution = invoke(substitution, arguments); | |
| 232 if (substitution == null || isJsArray(substitution)) { | |
| 233 arguments = substitution; | |
| 234 } else if (isJsFunction(substitution)) { | |
| 235 // TODO(johnniwinther): Check if this is still needed. | |
| 236 arguments = invoke(substitution, arguments); | |
| 237 } | |
| 238 } | |
| 239 return arguments; | |
| 240 } | |
| 241 | |
| 242 /** | |
| 243 * Perform a type check with arguments on the Dart object [object]. | |
| 244 * | |
| 245 * Parameters: | |
| 246 * - [isField]: the name of the flag/function to check if the object | |
| 247 * is of the correct class. | |
| 248 * - [checks]: the (JavaScript) list of type representations for the | |
| 249 * arguments to check against. | |
| 250 * - [asField]: the name of the function that transforms the type | |
| 251 * arguments of [objects] to an instance of the class that we check | |
| 252 * against. | |
| 253 */ | |
| 254 bool checkSubtype(Object object, String isField, List checks, String asField) { | |
| 255 if (object == null) return false; | |
| 256 var arguments = getRuntimeTypeInfo(object); | |
| 257 // Interceptor is needed for JSArray and native classes. | |
| 258 // TODO(sra): It could be a more specialized interceptor since [object] is not | |
| 259 // `null` or a primitive. | |
| 260 // TODO(9586): Move type info for static functions onto an interceptor. | |
| 261 var interceptor = getInterceptor(object); | |
| 262 var isSubclass = getField(interceptor, isField); | |
| 263 // When we read the field and it is not there, [isSubclass] will be `null`. | |
| 264 if (isSubclass == null) return false; | |
| 265 // Should the asField function be passed the receiver? | |
| 266 var substitution = getField(interceptor, asField); | |
| 267 return checkArguments(substitution, arguments, checks); | |
| 268 } | |
| 269 | |
| 270 /// Returns the field's type name. | |
| 271 /// | |
| 272 /// In minified mode, uses the unminified names if available. | |
| 273 String computeTypeName(String isField, List arguments) { | |
| 274 // Extract the class name from the is field and append the textual | |
| 275 // representation of the type arguments. | |
| 276 return Primitives.formatType(isCheckPropertyToJsConstructorName(isField), | |
| 277 arguments); | |
| 278 } | |
| 279 | |
| 280 Object subtypeCast(Object object, String isField, List checks, String asField) { | |
| 281 if (object != null && !checkSubtype(object, isField, checks, asField)) { | |
| 282 String actualType = Primitives.objectTypeName(object); | |
| 283 String typeName = computeTypeName(isField, checks); | |
| 284 // TODO(johnniwinther): Move type lookup to [CastErrorImplementation] to | |
| 285 // align with [TypeErrorImplementation]. | |
| 286 throw new CastErrorImplementation(actualType, typeName); | |
| 287 } | |
| 288 return object; | |
| 289 } | |
| 290 | |
| 291 Object assertSubtype(Object object, String isField, List checks, | |
| 292 String asField) { | |
| 293 if (object != null && !checkSubtype(object, isField, checks, asField)) { | |
| 294 String typeName = computeTypeName(isField, checks); | |
| 295 throw new TypeErrorImplementation(object, typeName); | |
| 296 } | |
| 297 return object; | |
| 298 } | |
| 299 | |
| 300 /// Checks that the type represented by [subtype] is a subtype of [supertype]. | |
| 301 /// If not a type error with [message] is thrown. | |
| 302 assertIsSubtype(var subtype, var supertype, String message) { | |
| 303 if (!isSubtype(subtype, supertype)) { | |
| 304 throwTypeError(message); | |
| 305 } | |
| 306 } | |
| 307 | |
| 308 throwTypeError(message) { | |
| 309 throw new TypeErrorImplementation.fromMessage(message); | |
| 310 } | |
| 311 | |
| 312 /** | |
| 313 * Check that the types in the list [arguments] are subtypes of the types in | |
| 314 * list [checks] (at the respective positions), possibly applying [substitution] | |
| 315 * to the arguments before the check. | |
| 316 * | |
| 317 * See the comment in the beginning of this file for a description of the | |
| 318 * possible values for [substitution]. | |
| 319 */ | |
| 320 bool checkArguments(var substitution, var arguments, var checks) { | |
| 321 return areSubtypes(substitute(substitution, arguments), checks); | |
| 322 } | |
| 323 | |
| 324 /** | |
| 325 * Checks whether the types of [s] are all subtypes of the types of [t]. | |
| 326 * | |
| 327 * [s] and [t] are either `null` or JavaScript arrays of type representations, | |
| 328 * A `null` argument is interpreted as the arguments of a raw type, that is a | |
| 329 * list of `dynamic`. If [s] and [t] are JavaScript arrays they must be of the | |
| 330 * same length. | |
| 331 * | |
| 332 * See the comment in the beginning of this file for a description of type | |
| 333 * representations. | |
| 334 */ | |
| 335 bool areSubtypes(var s, var t) { | |
| 336 // `null` means a raw type. | |
| 337 if (s == null || t == null) return true; | |
| 338 | |
| 339 assert(isJsArray(s)); | |
| 340 assert(isJsArray(t)); | |
| 341 assert(getLength(s) == getLength(t)); | |
| 342 | |
| 343 int len = getLength(s); | |
| 344 for (int i = 0; i < len; i++) { | |
| 345 if (!isSubtype(getIndex(s, i), getIndex(t, i))) { | |
| 346 return false; | |
| 347 } | |
| 348 } | |
| 349 return true; | |
| 350 } | |
| 351 | |
| 352 /** | |
| 353 * Computes the signature by applying the type arguments of [context] as an | |
| 354 * instance of [contextName] to the signature function [signature]. | |
| 355 */ | |
| 356 computeSignature(var signature, var context, var contextName) { | |
| 357 var typeArguments = getRuntimeTypeArguments(context, contextName); | |
| 358 return invokeOn(signature, context, typeArguments); | |
| 359 } | |
| 360 | |
| 361 /** | |
| 362 * Returns `true` if the runtime type representation [type] is a supertype of | |
| 363 * [Null]. | |
| 364 */ | |
| 365 bool isSupertypeOfNull(var type) { | |
| 366 // `null` means `dynamic`. | |
| 367 return type == null || isDartObjectTypeRti(type) || isNullTypeRti(type); | |
| 368 } | |
| 369 | |
| 370 /** | |
| 371 * Tests whether the Dart object [o] is a subtype of the runtime type | |
| 372 * representation [t]. | |
| 373 * | |
| 374 * See the comment in the beginning of this file for a description of type | |
| 375 * representations. | |
| 376 */ | |
| 377 bool checkSubtypeOfRuntimeType(o, t) { | |
| 378 if (o == null) return isSupertypeOfNull(t); | |
| 379 if (t == null) return true; | |
| 380 // Get the runtime type information from the object here, because we may | |
| 381 // overwrite o with the interceptor below. | |
| 382 var rti = getRuntimeTypeInfo(o); | |
| 383 o = getInterceptor(o); | |
| 384 var type = getRawRuntimeType(o); | |
| 385 if (rti != null) { | |
| 386 // If the type has type variables (that is, `rti != null`), make a copy of | |
| 387 // the type arguments and insert [o] in the first position to create a | |
| 388 // compound type representation. | |
| 389 rti = JS('JSExtendableArray', '#.slice()', rti); // Make a copy. | |
| 390 JS('', '#.splice(0, 0, #)', rti, type); // Insert type at position 0. | |
| 391 type = rti; | |
| 392 } | |
| 393 if (isDartFunctionType(t)) { | |
| 394 // Functions are treated specially and have their type information stored | |
| 395 // directly in the instance. | |
| 396 var targetSignatureFunction = | |
| 397 getField(o, '${JS_GET_NAME(JsGetName.SIGNATURE_NAME)}'); | |
| 398 if (targetSignatureFunction == null) return false; | |
| 399 type = invokeOn(targetSignatureFunction, o, null); | |
| 400 return isFunctionSubtype(type, t); | |
| 401 } | |
| 402 return isSubtype(type, t); | |
| 403 } | |
| 404 | |
| 405 Object subtypeOfRuntimeTypeCast(Object object, var type) { | |
| 406 if (object != null && !checkSubtypeOfRuntimeType(object, type)) { | |
| 407 String actualType = Primitives.objectTypeName(object); | |
| 408 throw new CastErrorImplementation(actualType, runtimeTypeToString(type)); | |
| 409 } | |
| 410 return object; | |
| 411 } | |
| 412 | |
| 413 Object assertSubtypeOfRuntimeType(Object object, var type) { | |
| 414 if (object != null && !checkSubtypeOfRuntimeType(object, type)) { | |
| 415 throw new TypeErrorImplementation(object, runtimeTypeToString(type)); | |
| 416 } | |
| 417 return object; | |
| 418 } | |
| 419 | |
| 420 /** | |
| 421 * Extracts the type arguments from a type representation. The result is a | |
| 422 * JavaScript array or `null`. | |
| 423 */ | |
| 424 getArguments(var type) { | |
| 425 return isJsArray(type) ? JS('var', r'#.slice(1)', type) : null; | |
| 426 } | |
| 427 | |
| 428 /** | |
| 429 * Checks whether the type represented by the type representation [s] is a | |
| 430 * subtype of the type represented by the type representation [t]. | |
| 431 * | |
| 432 * See the comment in the beginning of this file for a description of type | |
| 433 * representations. | |
| 434 * | |
| 435 * The arguments [s] and [t] must be types, usually represented by the | |
| 436 * constructor of the class, or an array (for generic types). | |
| 437 */ | |
| 438 bool isSubtype(var s, var t) { | |
| 439 // Subtyping is reflexive. | |
| 440 if (isIdentical(s, t)) return true; | |
| 441 // If either type is dynamic, [s] is a subtype of [t]. | |
| 442 if (s == null || t == null) return true; | |
| 443 if (isDartFunctionType(t)) { | |
| 444 return isFunctionSubtype(s, t); | |
| 445 } | |
| 446 // Check function types against the Function class. | |
| 447 if (isDartFunctionType(s)) { | |
| 448 return isDartFunctionTypeRti(t); | |
| 449 } | |
| 450 | |
| 451 // Get the object describing the class and check for the subtyping flag | |
| 452 // constructed from the type of [t]. | |
| 453 var typeOfS = isJsArray(s) ? getIndex(s, 0) : s; | |
| 454 var typeOfT = isJsArray(t) ? getIndex(t, 0) : t; | |
| 455 | |
| 456 // Check for a subtyping flag. | |
| 457 // Get the necessary substitution of the type arguments, if there is one. | |
| 458 var substitution; | |
| 459 if (isNotIdentical(typeOfT, typeOfS)) { | |
| 460 if (!builtinIsSubtype(typeOfS, runtimeTypeToString(typeOfT))) { | |
| 461 return false; | |
| 462 } | |
| 463 var typeOfSPrototype = JS('', '#.prototype', typeOfS); | |
| 464 var field = '${JS_GET_NAME(JsGetName.OPERATOR_AS_PREFIX)}' | |
| 465 '${runtimeTypeToString(typeOfT)}'; | |
| 466 substitution = getField(typeOfSPrototype, field); | |
| 467 } | |
| 468 // The class of [s] is a subclass of the class of [t]. If [s] has no type | |
| 469 // arguments and no substitution, it is used as raw type. If [t] has no | |
| 470 // type arguments, it used as a raw type. In both cases, [s] is a subtype | |
| 471 // of [t]. | |
| 472 if ((!isJsArray(s) && substitution == null) || !isJsArray(t)) { | |
| 473 return true; | |
| 474 } | |
| 475 // Recursively check the type arguments. | |
| 476 return checkArguments(substitution, getArguments(s), getArguments(t)); | |
| 477 } | |
| 478 | |
| 479 bool isAssignable(var s, var t) { | |
| 480 return isSubtype(s, t) || isSubtype(t, s); | |
| 481 } | |
| 482 | |
| 483 /** | |
| 484 * If [allowShorter] is `true`, [t] is allowed to be shorter than [s]. | |
| 485 */ | |
| 486 bool areAssignable(List s, List t, bool allowShorter) { | |
| 487 // Both lists are empty and thus equal. | |
| 488 if (t ==null && s == null) return true; | |
| 489 // [t] is empty (and [s] is not) => only OK if [allowShorter]. | |
| 490 if (t == null) return allowShorter; | |
| 491 // [s] is empty (and [t] is not) => [s] is not longer or equal to [t]. | |
| 492 if (s == null) return false; | |
| 493 | |
| 494 assert(isJsArray(s)); | |
| 495 assert(isJsArray(t)); | |
| 496 | |
| 497 int sLength = getLength(s); | |
| 498 int tLength = getLength(t); | |
| 499 if (allowShorter) { | |
| 500 if (sLength < tLength) return false; | |
| 501 } else { | |
| 502 if (sLength != tLength) return false; | |
| 503 } | |
| 504 | |
| 505 for (int i = 0; i < tLength; i++) { | |
| 506 if (!isAssignable(getIndex(s, i), getIndex(t, i))) { | |
| 507 return false; | |
| 508 } | |
| 509 } | |
| 510 return true; | |
| 511 } | |
| 512 | |
| 513 bool areAssignableMaps(var s, var t) { | |
| 514 if (t == null) return true; | |
| 515 if (s == null) return false; | |
| 516 | |
| 517 assert(isJsObject(s)); | |
| 518 assert(isJsObject(t)); | |
| 519 | |
| 520 List names = | |
| 521 JSArray.markFixedList(JS('', 'Object.getOwnPropertyNames(#)', t)); | |
| 522 for (int i = 0; i < names.length; i++) { | |
| 523 var name = names[i]; | |
| 524 if (JS('bool', '!Object.hasOwnProperty.call(#, #)', s, name)) { | |
| 525 return false; | |
| 526 } | |
| 527 var tType = JS('', '#[#]', t, name); | |
| 528 var sType = JS('', '#[#]', s, name); | |
| 529 if (!isAssignable(tType, sType)) return false; | |
| 530 } | |
| 531 return true; | |
| 532 } | |
| 533 | |
| 534 bool isFunctionSubtype(var s, var t) { | |
| 535 assert(isDartFunctionType(t)); | |
| 536 if (!isDartFunctionType(s)) return false; | |
| 537 var voidReturnTag = JS_GET_NAME(JsGetName.FUNCTION_TYPE_VOID_RETURN_TAG); | |
| 538 var returnTypeTag = JS_GET_NAME(JsGetName.FUNCTION_TYPE_RETURN_TYPE_TAG); | |
| 539 if (hasField(s, voidReturnTag)) { | |
| 540 if (hasNoField(t, voidReturnTag) && hasField(t, returnTypeTag)) { | |
| 541 return false; | |
| 542 } | |
| 543 } else if (hasNoField(t, voidReturnTag)) { | |
| 544 var sReturnType = getField(s, returnTypeTag); | |
| 545 var tReturnType = getField(t, returnTypeTag); | |
| 546 if (!isAssignable(sReturnType, tReturnType)) return false; | |
| 547 } | |
| 548 var requiredParametersTag = | |
| 549 JS_GET_NAME(JsGetName.FUNCTION_TYPE_REQUIRED_PARAMETERS_TAG); | |
| 550 var sParameterTypes = getField(s, requiredParametersTag); | |
| 551 var tParameterTypes = getField(t, requiredParametersTag); | |
| 552 | |
| 553 var optionalParametersTag = | |
| 554 JS_GET_NAME(JsGetName.FUNCTION_TYPE_OPTIONAL_PARAMETERS_TAG); | |
| 555 var sOptionalParameterTypes = getField(s, optionalParametersTag); | |
| 556 var tOptionalParameterTypes = getField(t, optionalParametersTag); | |
| 557 | |
| 558 int sParametersLen = sParameterTypes != null ? getLength(sParameterTypes) : 0; | |
| 559 int tParametersLen = tParameterTypes != null ? getLength(tParameterTypes) : 0; | |
| 560 | |
| 561 int sOptionalParametersLen = | |
| 562 sOptionalParameterTypes != null ? getLength(sOptionalParameterTypes) : 0; | |
| 563 int tOptionalParametersLen = | |
| 564 tOptionalParameterTypes != null ? getLength(tOptionalParameterTypes) : 0; | |
| 565 | |
| 566 if (sParametersLen > tParametersLen) { | |
| 567 // Too many required parameters in [s]. | |
| 568 return false; | |
| 569 } | |
| 570 if (sParametersLen + sOptionalParametersLen < | |
| 571 tParametersLen + tOptionalParametersLen) { | |
| 572 // Too few required and optional parameters in [s]. | |
| 573 return false; | |
| 574 } | |
| 575 if (sParametersLen == tParametersLen) { | |
| 576 // Simple case: Same number of required parameters. | |
| 577 if (!areAssignable(sParameterTypes, tParameterTypes, false)) return false; | |
| 578 if (!areAssignable(sOptionalParameterTypes, | |
| 579 tOptionalParameterTypes, true)) { | |
| 580 return false; | |
| 581 } | |
| 582 } else { | |
| 583 // Complex case: Optional parameters of [s] for required parameters of [t]. | |
| 584 int pos = 0; | |
| 585 // Check all required parameters of [s]. | |
| 586 for (; pos < sParametersLen; pos++) { | |
| 587 if (!isAssignable(getIndex(sParameterTypes, pos), | |
| 588 getIndex(tParameterTypes, pos))) { | |
| 589 return false; | |
| 590 } | |
| 591 } | |
| 592 int sPos = 0; | |
| 593 int tPos = pos; | |
| 594 // Check the remaining parameters of [t] with the first optional parameters | |
| 595 // of [s]. | |
| 596 for (; tPos < tParametersLen ; sPos++, tPos++) { | |
| 597 if (!isAssignable(getIndex(sOptionalParameterTypes, sPos), | |
| 598 getIndex(tParameterTypes, tPos))) { | |
| 599 return false; | |
| 600 } | |
| 601 } | |
| 602 tPos = 0; | |
| 603 // Check the optional parameters of [t] with the remaining optional | |
| 604 // parameters of [s]: | |
| 605 for (; tPos < tOptionalParametersLen ; sPos++, tPos++) { | |
| 606 if (!isAssignable(getIndex(sOptionalParameterTypes, sPos), | |
| 607 getIndex(tOptionalParameterTypes, tPos))) { | |
| 608 return false; | |
| 609 } | |
| 610 } | |
| 611 } | |
| 612 | |
| 613 var namedParametersTag = | |
| 614 JS_GET_NAME(JsGetName.FUNCTION_TYPE_NAMED_PARAMETERS_TAG); | |
| 615 var sNamedParameters = getField(s, namedParametersTag); | |
| 616 var tNamedParameters = getField(t, namedParametersTag); | |
| 617 return areAssignableMaps(sNamedParameters, tNamedParameters); | |
| 618 } | |
| 619 | |
| 620 /** | |
| 621 * Calls the JavaScript [function] with the [arguments] with the global scope | |
| 622 * as the `this` context. | |
| 623 */ | |
| 624 invoke(var function, var arguments) => invokeOn(function, null, arguments); | |
| 625 | |
| 626 /** | |
| 627 * Calls the JavaScript [function] with the [arguments] with [receiver] as the | |
| 628 * `this` context. | |
| 629 */ | |
| 630 Object invokeOn(function, receiver, arguments) { | |
| 631 assert(isJsFunction(function)); | |
| 632 assert(arguments == null || isJsArray(arguments)); | |
| 633 return JS('var', r'#.apply(#, #)', function, receiver, arguments); | |
| 634 } | |
| 635 | |
| 636 /// Calls the property [name] on the JavaScript [object]. | |
| 637 call(var object, String name) => JS('var', r'#[#]()', object, name); | |
| 638 | |
| 639 /// Returns the property [name] of the JavaScript object [object]. | |
| 640 getField(var object, String name) => JS('var', r'#[#]', object, name); | |
| 641 | |
| 642 /// Returns the property [index] of the JavaScript array [array]. | |
| 643 getIndex(var array, int index) { | |
| 644 assert(isJsArray(array)); | |
| 645 return JS('var', r'#[#]', array, index); | |
| 646 } | |
| 647 | |
| 648 /// Returns the length of the JavaScript array [array]. | |
| 649 int getLength(var array) { | |
| 650 assert(isJsArray(array)); | |
| 651 return JS('int', r'#.length', array); | |
| 652 } | |
| 653 | |
| 654 /// Returns whether [value] is a JavaScript array. | |
| 655 bool isJsArray(var value) { | |
| 656 return value is JSArray; | |
| 657 } | |
| 658 | |
| 659 hasField(var object, var name) => JS('bool', r'# in #', name, object); | |
| 660 | |
| 661 hasNoField(var object, var name) => !hasField(object, name); | |
| 662 | |
| 663 /// Returns `true` if [o] is a JavaScript function. | |
| 664 bool isJsFunction(var o) => JS('bool', r'typeof # == "function"', o); | |
| 665 | |
| 666 /// Returns `true` if [o] is a JavaScript object. | |
| 667 bool isJsObject(var o) => JS('bool', r"typeof # == 'object'", o); | |
| 668 | |
| 669 /** | |
| 670 * Returns `true` if the JavaScript values [s] and [t] are identical. We use | |
| 671 * this helper instead of [identical] because `identical` needs to merge | |
| 672 * `null` and `undefined` (which we can avoid). | |
| 673 */ | |
| 674 bool isIdentical(var s, var t) => JS('bool', '# === #', s, t); | |
| 675 | |
| 676 /** | |
| 677 * Returns `true` if the JavaScript values [s] and [t] are not identical. We use | |
| 678 * this helper instead of [identical] because `identical` needs to merge | |
| 679 * `null` and `undefined` (which we can avoid). | |
| 680 */ | |
| 681 bool isNotIdentical(var s, var t) => JS('bool', '# !== #', s, t); | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1212513002:
sdk files reorganization to make dart2js a proper package (Closed)
Base URL: git@github.com:dart-lang/sdk.git@master