Function sweeplist

depends/lua/src/lgc.c:735–752

** sweep at most 'count' elements from a list of GCObjects erasing dead ** objects, where a dead object is one marked with the old (non current) ** white; change all non-dead objects back to white, preparing for next ** collection cycle. Return where to continue the traversal or NULL if ** list is finished. */

** list is finished.
*/
static GCObject **sweeplist (lua_State *L, GCObject **p, lu_mem count) {
  global_State *g = G(L);
  int ow = otherwhite(g);
  int white = luaC_white(g);  /* current white */
  while (*p != NULL && count-- > 0) {
    GCObject *curr = *p;
    int marked = curr->marked;
    if (isdeadm(ow, marked)) {  /* is 'curr' dead? */
      *p = curr->next;  /* remove 'curr' from list */
      freeobj(L, curr);  /* erase 'curr' */
    }
    else {  /* change mark to 'white' */
      curr->marked = cast_byte((marked & maskcolors) | white);
      p = &curr->next;  /* go to next element */
    }
  }
  return (*p == NULL) ? NULL : p;
}


/*