Function reallymarkobject

third-party/lua-5.2.4/src/lgc.c:243–295

** mark an object. Userdata, strings, and closed upvalues are visited ** and turned black here. Other objects are marked gray and added ** to appropriate list to be visited (and turned black) later. (Open ** upvalues are already linked in 'headuv' list.) */

** upvalues are already linked in 'headuv' list.)
*/
static void reallymarkobject (global_State *g, GCObject *o) {
  lu_mem size;
  white2gray(o);
  switch (gch(o)->tt) {
    case LUA_TSHRSTR:
    case LUA_TLNGSTR: {
      size = sizestring(gco2ts(o));
      break;  /* nothing else to mark; make it black */
    }
    case LUA_TUSERDATA: {
      Table *mt = gco2u(o)->metatable;
      markobject(g, mt);
      markobject(g, gco2u(o)->env);
      size = sizeudata(gco2u(o));
      break;
    }
    case LUA_TUPVAL: {
      UpVal *uv = gco2uv(o);
      markvalue(g, uv->v);
      if (uv->v != &uv->u.value)  /* open? */
        return;  /* open upvalues remain gray */
      size = sizeof(UpVal);
      break;
    }
    case LUA_TLCL: {
      gco2lcl(o)->gclist = g->gray;
      g->gray = o;
      return;
    }
    case LUA_TCCL: {
      gco2ccl(o)->gclist = g->gray;
      g->gray = o;
      return;
    }
    case LUA_TTABLE: {
      linktable(gco2t(o), &g->gray);
      return;
    }
    case LUA_TTHREAD: {
      gco2th(o)->gclist = g->gray;
      g->gray = o;
      return;
    }
    case LUA_TPROTO: {
      gco2p(o)->gclist = g->gray;
      g->gray = o;
      return;
    }
    default: lua_assert(0); return;
  }
  gray2black(o);
  g->GCmemtrav += size;
}


/*