178     const upb_def *subdef;  in upb_validate_field()  local
186     subdef = upb_fielddef_subdef(f);  in upb_validate_field()
187     if (subdef == NULL) {  in upb_validate_field()
193     if (!upb_def_isfrozen(subdef) && !subdef->came_from_user) {  in upb_validate_field()
240     const upb_msgdef *subdef = upb_fielddef_msgsubdef(f);  in upb_validate_field()  local
241     if (upb_msgdef_mapentry(subdef) && !upb_fielddef_isseq(f)) {  in upb_validate_field()
1263 static bool upb_subdef_typecheck(upb_fielddef *f, const upb_def *subdef,  in upb_subdef_typecheck()  argument
1266     if (upb_dyncast_msgdef(subdef)) return true;  in upb_subdef_typecheck()
1270     if (upb_dyncast_enumdef(subdef)) return true;  in upb_subdef_typecheck()
1287 bool upb_fielddef_setsubdef(upb_fielddef *f, const upb_def *subdef,  in upb_fielddef_setsubdef()  argument
1291   if (subdef && !upb_subdef_typecheck(f, subdef, s)) return false;  in upb_fielddef_setsubdef()
1293   f->sub.def = subdef;  in upb_fielddef_setsubdef()
1299 bool upb_fielddef_setmsgsubdef(upb_fielddef *f, const upb_msgdef *subdef,  in upb_fielddef_setmsgsubdef()  argument
1301   return upb_fielddef_setsubdef(f, upb_msgdef_upcast(subdef), s);  in upb_fielddef_setmsgsubdef()
1304 bool upb_fielddef_setenumsubdef(upb_fielddef *f, const upb_enumdef *subdef,  in upb_fielddef_setenumsubdef()  argument
1306   return upb_fielddef_setsubdef(f, upb_enumdef_upcast(subdef), s);  in upb_fielddef_setenumsubdef()
2191     const upb_msgdef *subdef;  in newformsg()  local
2196     subdef = upb_downcast_msgdef(upb_fielddef_subdef(f));  in newformsg()
2197     if (upb_inttable_lookupptr(&s->tab, subdef, &subm_ent)) {  in newformsg()
2200       upb_handlers *sub_mh = newformsg(subdef, &sub_mh, s);  in newformsg()
3893         const upb_def *subdef;  in upb_resolve_dfs()  local
3896         subdef = upb_fielddef_subdef(f);  in upb_resolve_dfs()
3899         if (def->base.group == subdef->base.group) continue;  in upb_resolve_dfs()
3902         need_dup |= upb_resolve_dfs(subdef, addtab, new_owner, seen, s);  in upb_resolve_dfs()
4079         upb_def *subdef = upb_resolvename(&addtab, base, name);  in symtab_add()  local
4080         if (subdef == NULL) {  in symtab_add()
4081           subdef = upb_resolvename(&s->symtab, base, name);  in symtab_add()
4083         if (subdef == NULL) {  in symtab_add()
4087         } else if (!upb_fielddef_setsubdef(f, subdef, status)) {  in symtab_add()