Implement 'print', 'up', 'down', and 'frame' commands in the Observatory debugger.

runtime/vm/message_handler.cc

 // Copyright (c) 2011, 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 "vm/message_handler.h"
 
 #include "vm/dart.h"
 #include "vm/lockers.h"
 #include "vm/port.h"
 
@@ skipping 84 matching lines @@
 
 void MessageHandler::PostMessage(Message* message, bool before_events) {
   MonitorLocker ml(&monitor_);
   if (FLAG_trace_isolates) {
     const char* source_name = "<native code>";
     Isolate* source_isolate = Isolate::Current();
     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",
-              source_name, name(), message->dest_port());
+              message->len(), source_name, name(), message->dest_port());
   }
 
   Message::Priority saved_priority = message->priority();
   if (message->IsOOB()) {
     oob_queue_->Enqueue(message, before_events);
   } else {
     queue_->Enqueue(message, before_events);
   }
   message = NULL;  // Do not access message.  May have been deleted.
 
@@ skipping 20 matching lines @@
 bool MessageHandler::HandleMessages(bool allow_normal_messages,
                                     bool allow_multiple_normal_messages) {
   // If isolate() returns NULL StartIsolateScope does nothing.
   StartIsolateScope start_isolate(isolate());
 
   // TODO(turnidge): Add assert that monitor_ is held here.
   bool result = true;
   Message::Priority min_priority = (allow_normal_messages && !paused()) ?
       Message::kNormalPriority : Message::kOOBPriority;
   Message* message = DequeueMessage(min_priority);
+  intptr_t message_len = message->len();
   while (message != NULL) {
     if (FLAG_trace_isolates) {
       OS::Print("[<] Handling message:\n"
+                "\tlen:        %" Pd "\n"
                 "\thandler:    %s\n"
                 "\tport:       %" Pd64 "\n",
-                name(), message->dest_port());
+                message_len, name(), message->dest_port());
     }
 
     // Release the monitor_ temporarily while we handle the message.
     // The monitor was acquired in MessageHandler::TaskCallback().
     monitor_.Exit();
     Message::Priority saved_priority = message->priority();
     Dart_Port saved_dest_port = message->dest_port();
     result = HandleMessage(message);
     message = NULL;  // May be deleted by now.
     monitor_.Enter();
     if (FLAG_trace_isolates) {
       OS::Print("[.] Message handled:\n"
+                "\tlen:        %" Pd "\n"
                 "\thandler:    %s\n"
                 "\tport:       %" Pd64 "\n",
-                name(), saved_dest_port);
+                message_len, name(), saved_dest_port);
     }
     if (!result) {
       // If we hit an error, we're done processing messages.
       break;
     }
     // Some callers want to process only one normal message and then quit. At
     // the same time it is OK to process multiple OOB messages.
     if ((saved_priority == Message::kNormalPriority) &&
         !allow_multiple_normal_messages) {
       break;
@@ skipping 141 matching lines @@
 
 void MessageHandler::decrement_live_ports() {
   MonitorLocker ml(&monitor_);
 #if defined(DEBUG)
   CheckAccess();
 #endif
   live_ports_--;
 }
 
 }  // namespace dart