Function Sys_DebuggerLightweightHook

engine/script/src/script_sys.cpp:1455–1473

    //undocummented function for debugger

    static void Sys_DebuggerLightweightHook(lua_State *L, lua_Debug *ar)
    {
        int top = lua_gettop(L);
        lua_getinfo(L, "S", ar);
        lua_rawgeti(L, LUA_REGISTRYINDEX, g_DebuggerLightweightHook);
        lua_pushstring(L, ar->source);
        lua_pushnumber(L, ar->lastlinedefined);
        if (lua_pushthread(L))
        {
            lua_pop(L, 1);
            lua_pushnil(L); //main thread is not a coroutine
        }
        //[-1] - thread or nil
        //[-2] - lastlinedefined (number)
        //[-3] - source (string)
        //[-4] - callback
        lua_call(L, 3, 0);
        assert(top == lua_gettop(L));
    }

    static int Sys_SetDebuggerLightweightHook(lua_State* L)
    {