Function genlink

3rd/lua-5.4.3/src/lgc.c:424–431

** Check whether object 'o' should be kept in the 'grayagain' list for ** post-processing by 'correctgraylist'. (It could put all old objects ** in the list and leave all the work to 'correctgraylist', but it is ** more efficient to avoid adding elements that will be removed.) Only ** TOUCHED1 objects need to be in the list. TOUCHED2 doesn't need to go ** back to a gray list, but then it must beco

** 'correctgraylist' does when it finds a TOUCHED2 object.)
*/
static void genlink (global_State *g, GCObject *o) {
  lua_assert(isblack(o));
  if (getage(o) == G_TOUCHED1) {  /* touched in this cycle? */
    linkobjgclist(o, g->grayagain);  /* link it back in 'grayagain' */
  }  /* everything else do not need to be linked back */
  else if (getage(o) == G_TOUCHED2)
    changeage(o, G_TOUCHED2, G_OLD);  /* advance age */
}


/*