Adds a special case for sending an int over a port with the native API.

runtime/vm/message_handler.cc

Index: runtime/vm/message_handler.cc
diff --git a/runtime/vm/message_handler.cc b/runtime/vm/message_handler.cc
index 30194cd5b4ec4a3074f690712f8bca1c2679a0b3..2abe0bff5e4c3cc9737febd3b2de67c5af4daf72 100644
--- a/runtime/vm/message_handler.cc
+++ b/runtime/vm/message_handler.cc
@@ -132,12 +132,23 @@ void MessageHandler::PostMessage(Message* message, bool before_events) {
       if (source_isolate) {
         source_name = source_isolate->name();
       }
-      OS::Print("[>] Posting message:\n"
-                "\tlen:        %" Pd "\n"
-                "\tsource:     %s\n"
-                "\tdest:       %s\n"
-                "\tdest_port:  %" Pd64 "\n",
-                message->len(), source_name, name(), message->dest_port());
+      if (message->type() == Message::kDataType) {
+        OS::Print("[>] Posting data message:\n"
+                  "\tlen:        %" Pd "\n"
+                  "\tsource:     %s\n"
+                  "\tdest:       %s\n"
+                  "\tdest_port:  %" Pd64 "\n",
+                  message->len(), source_name, name(), message->dest_port());
+      } else {
+        ASSERT(message->type() == Message::kIntegerType);
+        OS::Print("[>] Posting integer message:\n"
+                  "\tvalue:      %" Pd "\n"
+                  "\tsource:     %s\n"
+                  "\tdest:       %s\n"
+                  "\tdest_port:  %" Pd64 "\n",
+                  message->integer(), source_name, name(),
+                  message->dest_port());
+      }
     }
 
     saved_priority = message->priority();
@@ -189,13 +200,21 @@ MessageHandler::MessageStatus MessageHandler::HandleMessages(
                                     : Message::kOOBPriority);
   Message* message = DequeueMessage(min_priority);
   while (message != NULL) {
-    intptr_t message_len = message->len();
     if (FLAG_trace_isolates) {
-      OS::Print("[<] Handling message:\n"
-                "\tlen:        %" Pd "\n"
-                "\thandler:    %s\n"
-                "\tport:       %" Pd64 "\n",
-                message_len, name(), message->dest_port());
+      if (message->type() == Message::kDataType) {
+        OS::Print("[<] Handling data message:\n"
+                  "\tlen:        %" Pd "\n"
+                  "\thandler:    %s\n"
+                  "\tport:       %" Pd64 "\n",
+                  message->len(), name(), message->dest_port());
+      } else {
+        ASSERT(message->type() == Message::kIntegerType);
+        OS::Print("[<] Handling integer message:\n"
+                  "\tvalue:      %" Pd "\n"
+                  "\thandler:    %s\n"
+                  "\tport:       %" Pd64 "\n",
+                  message->integer(), name(), message->dest_port());
+      }
     }
 
     // Release the monitor_ temporarily while we handle the message.
@@ -210,12 +229,22 @@ MessageHandler::MessageStatus MessageHandler::HandleMessages(
     message = NULL;  // May be deleted by now.
     monitor_.Enter();
     if (FLAG_trace_isolates) {
-      OS::Print("[.] Message handled (%s):\n"
-                "\tlen:        %" Pd "\n"
-                "\thandler:    %s\n"
-                "\tport:       %" Pd64 "\n",
-                MessageStatusString(status),
-                message_len, name(), saved_dest_port);
+      if (message->type() == Message::kDataType) {
+        OS::Print("[.] Data message handled (%s):\n"
+                  "\tlen:        %" Pd "\n"
+                  "\thandler:    %s\n"
+                  "\tport:       %" Pd64 "\n",
+                  MessageStatusString(status),
+                  message->len(), name(), saved_dest_port);
+      } else {
+        ASSERT(message->type() == Message::kIntegerType);
+        OS::Print("[.] Integer message handled (%s):\n"
+                  "\tvalue:      %" Pd "\n"
+                  "\thandler:    %s\n"
+                  "\tport:       %" Pd64 "\n",
+                  MessageStatusString(status),
+                  message->integer(), name(), saved_dest_port);
+      }
     }
     // If we are shutting down, do not process any more messages.
     if (status == kShutdown) {