Function db_upvalueid

3rd/lua-5.4.3/src/ldblib.c:298–305

static int db_upvalueid (lua_State *L) {
  void *id = checkupval(L, 1, 2, NULL);
  if (id != NULL)
    lua_pushlightuserdata(L, id);
  else
    luaL_pushfail(L);
  return 1;
}


static int db_upvaluejoin (lua_State *L) {