+#if VMG_UVAR
+ if (uvars == 1 && SvTYPE(sv) >= SVt_PVHV) {
+ /* mg was the first ext magic in the chain that had uvar */
+
+ for (mg = moremagic; mg; mg = mg->mg_moremagic) {
+ if ((mg->mg_type == PERL_MAGIC_ext) &&
+ (mg->mg_private >= SIG_MIN) &&
+ (mg->mg_private <= SIG_MAX) &&
+ SV2MGWIZ(mg->mg_ptr)->uvar) {
+ ++uvars;
+ break;
+ }
+ }
+
+ if (uvars == 1) {
+ struct ufuncs *uf;
+ for (prevmagic = NULL, mg = SvMAGIC(sv); mg; prevmagic = mg, mg = moremagic){
+ moremagic = mg->mg_moremagic;
+ if (mg->mg_type == PERL_MAGIC_uvar) { break; }
+ }
+ /* assert(mg); */
+ uf = (struct ufuncs *) mg->mg_ptr;
+ /* assert(uf->uf_val == vmg_svt_val); */
+ if (uf[1].uf_val || uf[1].uf_set) {
+ /* Revert the original uvar magic. */
+ uf[0] = uf[1];
+ Renew(uf, 1, struct ufuncs);
+ mg->mg_ptr = (char *) uf;
+ mg->mg_len = sizeof(struct ufuncs);
+ } else {
+ /* Remove the uvar magic. */
+ vmg_uvar_del(sv, prevmagic, mg, moremagic);
+ }
+ }
+ }
+#endif /* VMG_UVAR */
+