static void traverseweakvalue (global_State *g, Table *h) {
  Node *n, *limit = gnodelast(h);
  /* if there is array part, assume it may have white values (it is not
     worth traversing it now just to check) */
  int hasclears = (h->alimit > 0);
  for (n = gnode(h, 0); n < limit; n++) {  /* traverse hash part */
    if (isempty(gval(n)))  /* entry is empty? */
      clearkey(n);  /* clear its key */
    else {
      lua_assert(!keyisnil(n));
      markkey(g, n);
      if (!hasclears && iscleared(g, gcvalueN(gval(n))))  /* a white value? */
        hasclears = 1;  /* table will have to be cleared */
    }
  }
  if (g->gcstate == GCSatomic && hasclears)
    linkgclist(h, g->weak);  /* has to be cleared later */
  else
    linkgclist(h, g->grayagain);  /* must retraverse it in atomic phase */
}
Unknown