-#define PB_FIELD2(tag, type, rules, allocation, placement, message, field, prevfield, ptr) \
- PB_ ## rules ## _ ## allocation(tag, message, field, \
- PB_DATAOFFSET_ ## placement(message, field, prevfield), \
+#define PB_ONEOF_STATIC(u, tag, st, m, fd, ltype, ptr) \
+ {tag, PB_ATYPE_STATIC | PB_HTYPE_ONEOF | ltype, \
+ fd, pb_delta(st, which_ ## u, u.m), \
+ pb_membersize(st, u.m), 0, ptr}
+
+#define PB_ONEOF_POINTER(u, tag, st, m, fd, ltype, ptr) \
+ {tag, PB_ATYPE_POINTER | PB_HTYPE_ONEOF | ltype, \
+ fd, pb_delta(st, which_ ## u, u.m), \
+ pb_membersize(st, u.m[0]), 0, ptr}
+
+#define PB_ONEOF_FIELD(union_name, tag, type, rules, allocation, placement, message, field, prevfield, ptr) \
+ PB_ ## rules ## _ ## allocation(union_name, tag, message, field, \
+ PB_DATAOFFSET_ ## placement(message, union_name.field, prevfield), \