Make Logger::SuspectReadEvent extract the class name from the object.

src/log.cc

 // Copyright 2006-2008 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 575 matching lines @@
   if (OS::GetUserTime(&sec, &usec) != -1) {
     fprintf(logfile_, "%d,%d,", sec, usec);
   }
   fprintf(logfile_, "%.0f", OS::TimeCurrentMillis());
 
   fprintf(logfile_, "\n");
 #endif
 }
 
 
-void Logger::SuspectReadEvent(String* name, String* obj) {
+void Logger::SuspectReadEvent(String* name, Object* obj) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
   if (logfile_ == NULL || !FLAG_log_suspect) return;
+  String* class_name = obj->IsJSObject()
+                       ? JSObject::cast(obj)->class_name()
+                       : Heap::empty_string();
   ScopedLock sl(mutex_);
   fprintf(logfile_, "suspect-read,");
-  obj->PrintOn(logfile_);
+  class_name->PrintOn(logfile_);
   fprintf(logfile_, ",\"");
   name->PrintOn(logfile_);
   fprintf(logfile_, "\"\n");
 #endif
 }
 
 
 void Logger::HeapSampleBeginEvent(const char* space, const char* kind) {
 #ifdef ENABLE_LOGGING_AND_PROFILING
   if (logfile_ == NULL || !FLAG_log_gc) return;
@@ skipping 231 matching lines @@
   if (FLAG_log_state_changes) {
     LOG(StringEvent("Leaving", StateToString(state_)));
     if (previous_) {
       LOG(StringEvent("To", StateToString(previous_->state_)));
     }
   }
 }
 #endif
 
 } }  // namespace v8::internal