- Fix for unsuccessful hoisting of CheckSmi in _HashMap.[]=

runtime/lib/isolate_patch.dart

 // Copyright (c) 2012, 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:collection" show HashMap;
 
 patch class ReceivePort {
   /* patch */ factory ReceivePort() = _ReceivePortImpl;
 
   /* patch */ factory ReceivePort.fromRawReceivePort(RawReceivePort rawPort) =
@@ skipping 120 matching lines @@
 
   // Call into the VM to close the VM maintained mappings.
   _closeInternal() native "RawReceivePortImpl_closeInternal";
 
   void set handler(Function value) {
     _handlerMap[this._get_id()] = value;
   }
 
   // TODO(iposva): Ideally keep this map in the VM.
   // id to handler mapping.
-  static final Map _handlerMap = new HashMap();
+  static _initHandlerMap() {
+    // TODO(18511): Workaround bad CheckSmi hoisting.
+    var tempMap = new HashMap();
+    // Collect feedback that not all keys are Smis.
+    tempMap["."] = 1;
+    tempMap["."] = 2;
+
+    return new HashMap();
+  }
+  static final Map _handlerMap = _initHandlerMap();
 }
 
 
 class _SendPortImpl implements SendPort {
   /*--- public interface ---*/
   void send(var message) {
     _sendInternal(message);
   }
 
   bool operator==(var other) {
@@ skipping 107 matching lines @@
   }
 
   static final RawReceivePort _self = _mainPort;
   static RawReceivePort get _mainPort native "Isolate_mainPort";
 
   static SendPort _spawnFunction(Function topLevelFunction)
       native "Isolate_spawnFunction";
 
   static SendPort _spawnUri(String uri) native "Isolate_spawnUri";
 }