Function stackinuse

lib/lua/src/ldo.c:276–288

** Compute how much of the stack is being used, by computing the ** maximum top of all call frames in the stack and the current top. */

** maximum top of all call frames in the stack and the current top.
*/
static int stackinuse (lua_State *L) {
  CallInfo *ci;
  int res;
  StkId lim = L->top.p;
  for (ci = L->ci; ci != NULL; ci = ci->previous) {
    if (lim < ci->top.p) lim = ci->top.p;
  }
  lua_assert(lim <= L->stack_last.p + EXTRA_STACK);
  res = cast_int(lim - L->stack.p) + 1;  /* part of stack in use */
  if (res < LUA_MINSTACK)
    res = LUA_MINSTACK;  /* ensure a minimum size */
  return res;
}


/*