- Address warnings about 64-bit to 32-bit conversions.

runtime/bin/eventhandler.cc

 // 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.
 
 #include "bin/dartutils.h"
 #include "bin/eventhandler.h"
 #include "bin/socket.h"
 #include "bin/thread.h"
 
 #include "include/dart_api.h"
@@ skipping 74 matching lines @@
  * args[0] a ReceivePort args[1] with a notification event args[2].
  */
 void FUNCTION_NAME(EventHandler_SendData)(Dart_NativeArguments args) {
   Dart_Handle sender = Dart_GetNativeArgument(args, 0);
   intptr_t id = kInvalidId;
   if (Dart_IsNull(sender)) {
     id = kTimerId;
   } else {
     id = Socket::GetSocketIdNativeField(sender);
   }
+  // Get the _id field out of the port.
   Dart_Handle handle = Dart_GetNativeArgument(args, 1);
-  Dart_Port dart_port =
-      DartUtils::GetIntegerField(handle, DartUtils::kIdFieldName);
+  handle = Dart_GetField(handle, DartUtils::NewString(DartUtils::kIdFieldName));
+  if (Dart_IsError(handle)) {
+    Dart_PropagateError(handle);
+    UNREACHABLE();
+  }
+  Dart_Port dart_port;
+  handle = Dart_IntegerToInt64(handle, &dart_port);
+  if (Dart_IsError(handle)) {
+    Dart_PropagateError(handle);
+    UNREACHABLE();
+  }
   int64_t data = DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 2));
-  if (id == kTimerId && data == 0) {
+  if ((id == kTimerId) && (data == 0)) {
     // This is a 0-timer. Simply queue a 'null' on the port.
     DartUtils::PostNull(dart_port);
   } else {
     event_handler->SendData(id, dart_port, data);
   }
 }
 
 }  // namespace bin
 }  // namespace dart