Dumb-as-paste function call tracing

EnterExit.cpp

class EnterExit {
  pid_t pid;
  char thread_name[100];
  const char* label;
  void* ptr;

 public:
  EnterExit(const char* label, void* ptr)
   : pid(getpid()),
     label(label),
     ptr(ptr)
  {
    pthread_getname_np(pthread_self(), thread_name, sizeof(thread_name));

    fprintf(stderr, "JIMB %d %-12s %p: Enter %s\n",
            (int) pid, thread_name, ptr, label);
  }

  ~EnterExit() {
    fprintf(stderr, "JIMB %d %-12s %p: Exit  %s\n",
            (int) pid, thread_name, ptr, label);
  }

  void log(const char* text) {
    fprintf(stderr, "JIMB %d %-12s %p:       > %s\n",
            (int) pid, thread_name, ptr, text);
  }
};

Example.cpp

  bool
  DispatchDOMEvent(JSContext* aCx, WorkerPrivate* aWorkerPrivate,
                   DOMEventTargetHelper* aTarget, bool aIsMainThread)
  {
    EnterExit ee("MessageEventRunnable::DispatchDOMEvent", aWorkerPrivate);

    ...
              ee.log("queueing runnable for later");
    ...
  }