nllookup
childp = nllookup(&modules, destpc, NULL);
parentp = nllookup(caller_mod, rawp->raw_frompc, NULL);
childp = nllookup(callee_mod, rawp->raw_selfpc, NULL);
fnl = nllookup(module, (pctype) *pcptr, &nxt_func);
nltype *nllookup(mod_info_t *, pctype, pctype *);