Function luaK_checkstack

3rd/lua-5.4.3/src/lcode.c:465–473

** Check register-stack level, keeping track of its maximum size ** in field 'maxstacksize' */

** in field 'maxstacksize'
*/
void luaK_checkstack (FuncState *fs, int n) {
  int newstack = fs->freereg + n;
  if (newstack > fs->f->maxstacksize) {
    if (newstack >= MAXREGS)
      luaX_syntaxerror(fs->ls,
        "function or expression needs too many registers");
    fs->f->maxstacksize = cast_byte(newstack);
  }
}


/*