+struct block *gen_ncode(compiler_state_t *, const char *, bpf_u_int32,
+ struct qual);
+struct block *gen_proto_abbrev(compiler_state_t *, int);
+struct block *gen_relation(compiler_state_t *, int, struct arth *,
+ struct arth *, int);
+struct block *gen_less(compiler_state_t *, int);
+struct block *gen_greater(compiler_state_t *, int);
+struct block *gen_byteop(compiler_state_t *, int, int, int);
+struct block *gen_broadcast(compiler_state_t *, int);
+struct block *gen_multicast(compiler_state_t *, int);
+struct block *gen_inbound(compiler_state_t *, int);
+
+struct block *gen_llc(compiler_state_t *);
+struct block *gen_llc_i(compiler_state_t *);
+struct block *gen_llc_s(compiler_state_t *);
+struct block *gen_llc_u(compiler_state_t *);
+struct block *gen_llc_s_subtype(compiler_state_t *, bpf_u_int32);
+struct block *gen_llc_u_subtype(compiler_state_t *, bpf_u_int32);
+
+struct block *gen_vlan(compiler_state_t *, int);
+struct block *gen_mpls(compiler_state_t *, int);
+
+struct block *gen_pppoed(compiler_state_t *);
+struct block *gen_pppoes(compiler_state_t *, int);
+
+struct block *gen_geneve(compiler_state_t *, int);
+
+struct block *gen_atmfield_code(compiler_state_t *, int, bpf_int32,
+ bpf_u_int32, int);
+struct block *gen_atmtype_abbrev(compiler_state_t *, int type);
+struct block *gen_atmmulti_abbrev(compiler_state_t *, int type);
+
+struct block *gen_mtp2type_abbrev(compiler_state_t *, int type);
+struct block *gen_mtp3field_code(compiler_state_t *, int, bpf_u_int32,
+ bpf_u_int32, int);
+
+struct block *gen_pf_ifname(compiler_state_t *, const char *);
+struct block *gen_pf_rnr(compiler_state_t *, int);
+struct block *gen_pf_srnr(compiler_state_t *, int);
+struct block *gen_pf_ruleset(compiler_state_t *, char *);
+struct block *gen_pf_reason(compiler_state_t *, int);
+struct block *gen_pf_action(compiler_state_t *, int);
+
+struct block *gen_p80211_type(compiler_state_t *, int, int);
+struct block *gen_p80211_fcdir(compiler_state_t *, int);
+
+/*
+ * Representation of a program as a tree of blocks, plus current mark.
+ * A block is marked if only if its mark equals the current mark.
+ * Rather than traverse the code array, marking each item, 'cur_mark'
+ * is incremented. This automatically makes each element unmarked.
+ */
+#define isMarked(icp, p) ((p)->mark == (icp)->cur_mark)
+#define unMarkAll(icp) (icp)->cur_mark += 1
+#define Mark(icp, p) ((p)->mark = (icp)->cur_mark)