SV_ID1
sv = shadow_get(&objs[0], SV_ID1);
sv1[i] = shadow_alloc(&objs[i], SV_ID1,
sv1[i] = shadow_get_or_alloc(&objs[i], SV_ID1,
sv = shadow_get(&objs[i], SV_ID1);
sv = shadow_get_or_alloc(&objs[i], SV_ID1, sizeof(pndup[i]),
shadow_free(&objs[i], SV_ID1, shadow_dtor); /* 'char' pairs */
sv = shadow_get(&objs[i], SV_ID1);
shadow_free_all(SV_ID1, NULL); /* 'char' pairs */