valiswhite
if (valiswhite(gkey(n)))
if (valiswhite(&h->array[i])) {
if (valiswhite(gval(n))) /* value not marked yet? */
else if (valiswhite(gval(n))) { /* value not marked yet? */
if (valiswhite(o)) reallymarkobject(g,gcvalue(o)); }
#define luaC_barrier(L,p,v) { if (valiswhite(v) && isblack(obj2gco(p))) \
#define luaC_barrierback(L,p,v) { if (valiswhite(v) && isblack(obj2gco(p))) \