Function luaK_checkstack

third-party/lua-5.2.4/src/lcode.c:261–268

void luaK_checkstack (FuncState *fs, int n) {
  int newstack = fs->freereg + n;
  if (newstack > fs->f->maxstacksize) {
    if (newstack >= MAXSTACK)
      luaX_syntaxerror(fs->ls, "function or expression too complex");
    fs->f->maxstacksize = cast_byte(newstack);
  }
}


void luaK_reserveregs (FuncState *fs, int n) {