vm_backtrace_to_ary  897 vm_backtrace.c     return vm_backtrace_to_ary(th, argc, argv, 0, 0, to_str);
vm_backtrace_to_ary  953 vm_backtrace.c     return vm_backtrace_to_ary(GET_THREAD(), argc, argv, 1, 1, 1);
vm_backtrace_to_ary  981 vm_backtrace.c     return vm_backtrace_to_ary(GET_THREAD(), argc, argv, 1, 1, 0);