call_trace_func   426 vm_trace.c     static void call_trace_func(rb_event_flag_t, VALUE data, VALUE self, ID id, VALUE klass);
call_trace_func   493 vm_trace.c         rb_remove_event_hook(call_trace_func);
call_trace_func   503 vm_trace.c         rb_add_event_hook(call_trace_func, RUBY_EVENT_ALL, trace);
call_trace_func   514 vm_trace.c         rb_threadptr_add_event_hook(th, call_trace_func, RUBY_EVENT_ALL, trace, RUBY_EVENT_HOOK_FLAG_SAFE);
call_trace_func   553 vm_trace.c         rb_threadptr_remove_event_hook(th, call_trace_func, Qundef);