ins_link
ins_link(ins, &vc->v_link);
ins_link(ins, &chip->p_link);
ins_link(ins, &core->c_link);
ins_link(ins, &core->c_link_pchip);
ins_link(ins, &vc->v_link_pchip);
ins_link(ins, &vc->v_link_core);