Function lua_getstack

app/redis-6.2.6/deps/lua/src/ldebug.c:84–104

LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar) {
  int status;
  CallInfo *ci;
  lua_lock(L);
  for (ci = L->ci; level > 0 && ci > L->base_ci; ci--) {
    level--;
    if (f_isLua(ci))  /* Lua function? */
      level -= ci->tailcalls;  /* skip lost tail calls */
  }
  if (level == 0 && ci > L->base_ci) {  /* level found? */
    status = 1;
    ar->i_ci = cast_int(ci - L->base_ci);
  }
  else if (level < 0) {  /* level is of a lost tail call? */
    status = 1;
    ar->i_ci = 0;
  }
  else status = 0;  /* no such level */
  lua_unlock(L);
  return status;
}


static Proto *getluaproto (CallInfo *ci) {