A MessageObject is a purely internal object to hold information about

src/factory.h

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 347 matching lines @@
     return Handle<String>(&Heap::hidden_symbol_);
   }
 
   static Handle<SharedFunctionInfo> NewSharedFunctionInfo(
       Handle<String> name,
       int number_of_literals,
       Handle<Code> code,
       Handle<SerializedScopeInfo> scope_info);
   static Handle<SharedFunctionInfo> NewSharedFunctionInfo(Handle<String> name);
 
+  static Handle<JSMessageObject> NewJSMessageObject(
+      Handle<String> type,
+      Handle<JSArray> arguments,
+      int start_position,
+      int end_position,
+      Handle<Object> script,
+      Handle<Object> stack_trace,
+      Handle<Object> stack_frames);
+
   static Handle<NumberDictionary> DictionaryAtNumberPut(
       Handle<NumberDictionary>,
       uint32_t key,
       Handle<Object> value);
 
 #ifdef ENABLE_DEBUGGER_SUPPORT
   static Handle<DebugInfo> NewDebugInfo(Handle<SharedFunctionInfo> shared);
 #endif
 
   // Return a map using the map cache in the global context.
@@ skipping 34 matching lines @@
   // Update the map cache in the global context with (keys, map)
   static Handle<MapCache> AddToMapCache(Handle<Context> context,
                                         Handle<FixedArray> keys,
                                         Handle<Map> map);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FACTORY_H_