CTF_MAX_VLEN
#define CTF_INFO_VLEN(i) (((i) & CTF_MAX_VLEN))
func = (kind << 11) | (root << 10) | (vlen & CTF_MAX_VLEN);
ctt.ctt_info = (kind << 11) | (root << 10) | (vlen & CTF_MAX_VLEN);