unsigned int tbl_count(struct tbl *);
int tbl_foreach(struct tbl *,
int (*callback)(struct tbl_node *, void *aux), void *aux);
+struct tbl_node *tbl_next(struct tbl *, u32 *bucketp, u32 *objp);
int tbl_n_buckets(struct tbl *);
struct tbl *tbl_expand(struct tbl *);