rb_vmdebug_debug_print_pre  998 vm_core.h      extern void rb_vmdebug_debug_print_pre(rb_thread_t *th, rb_control_frame_t *cfp, VALUE *_pc);
rb_vmdebug_debug_print_pre   30 vm_exec.h          rb_vmdebug_debug_print_pre(th, GET_CFP(),GET_PC());