| // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| import 'dart:core' hide Symbol; |
| import 'dart:core' as core; |
| import 'dart:_js_primitives' show printString; |
| import 'dart:_js_helper' show patch, NoInline; |
| import 'dart:_interceptors' show JSArray; |
| import 'dart:_foreign_helper' show JS, JS_GET_FLAG; |
| |
| @patch |
| class Symbol implements core.Symbol { |
| @patch |
| const Symbol(String name) : this._name = name; |
| |
| @patch |
| int get hashCode { |
| int hash = JS('int|Null', '#._hashCode', this); |
| if (hash != null) return hash; |
| const arbitraryPrime = 664597; |
| hash = 0x1fffffff & (arbitraryPrime * _name.hashCode); |
| JS('', '#._hashCode = #', this, hash); |
| return hash; |
| } |
| |
| @patch |
| toString() => 'Symbol("$_name")'; |
| |
| @patch |
| static String computeUnmangledName(Symbol symbol) { |
| throw "unsupported operation"; |
| } |
| } |
| |
| @patch |
| void printToConsole(String line) { |
| printString('$line'); |
| } |
| |
| @patch |
| List<T> makeListFixedLength<T>(List<T> growableList) { |
| return JSArray.markFixedList(growableList); |
| } |
| |
| @patch |
| List<T> makeFixedListUnmodifiable<T>(List<T> fixedLengthList) { |
| return JSArray.markUnmodifiableList(fixedLengthList); |
| } |
| |
| @patch |
| @NoInline() |
| Object extractTypeArguments<T>(T instance, Function extract) { |
| // In Dart 2.0 this function is recognized and replaced with calls to |
| // js_runtime. |
| if (JS_GET_FLAG('STRONG_MODE')) throw new UnimplementedError(); |
| |
| // In Dart 1.0, instantiating the generic with dynamic (which this does), |
| // gives you an object that can be used anywhere a more specific type is |
| // expected, so this works for now. |
| |
| // This call to [extract] is also required for Dart 2.0 to model that the |
| // function is called and the returned value flows to the result of |
| // extractTypeArguments. |
| return extract(); |
| } |