shadow_get
sv = shadow_get(&objs[0], SV_ID1);
sv = shadow_get(&objs[i], SV_ID1);
sv = shadow_get(&objs[i], SV_ID2);
sv = shadow_get(&objs[i], SV_ID1);
sv = shadow_get(&objs[i], SV_ID2); /* 'int' pairs */
sv = shadow_get(&objs[i], SV_ID2);