Matthias Hausner
1a6d1eca32
Allow members of patch classes to be annotated with @patch. The VM ignores the annotation. I simply replaces the original method if the name matches, or reports an error if field names match. Adding a bit is_patched to members to do more checking remains a TODO. There are currently no unused bits available, and I don’t want to increase the size of Function objects for this. BUG= R=asiva@google.com Review URL: https://codereview.chromium.org/2230383003 .
64 lines
1.8 KiB
Dart
64 lines
1.8 KiB
Dart
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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@patch class _IOService {
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// Lazy initialize service ports, 32 per isolate.
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static const int _SERVICE_PORT_COUNT = 32;
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static List<SendPort> _servicePort = new List(_SERVICE_PORT_COUNT);
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static RawReceivePort _receivePort;
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static SendPort _replyToPort;
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static Map<int, Completer> _messageMap = {};
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static int _id = 0;
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@patch static Future _dispatch(int request, List data) {
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int id;
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do {
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id = _getNextId();
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} while (_messageMap.containsKey(id));
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int index = id % _SERVICE_PORT_COUNT;
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_initialize(index);
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var completer = new Completer();
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_messageMap[id] = completer;
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try {
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_servicePort[index].send([id, _replyToPort, request, data]);
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} catch (error) {
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_messageMap.remove(id).complete(error);
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if (_messageMap.length == 0) {
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_finalize();
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}
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}
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return completer.future;
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}
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static void _initialize(int index) {
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if (_servicePort[index] == null) {
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_servicePort[index] = _newServicePort();
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}
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if (_receivePort == null) {
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_receivePort = new RawReceivePort();
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_replyToPort = _receivePort.sendPort;
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_receivePort.handler = (data) {
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assert(data is List && data.length == 2);
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_messageMap.remove(data[0]).complete(data[1]);
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if (_messageMap.length == 0) {
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_finalize();
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}
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};
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}
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}
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static void _finalize() {
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_id = 0;
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_receivePort.close();
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_receivePort = null;
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}
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static int _getNextId() {
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if (_id == 0x7FFFFFFF) _id = 0;
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return _id++;
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}
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static SendPort _newServicePort() native "IOService_NewServicePort";
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}
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