Loader.cpp main函数解析

主函数入口分析

主要是检查配置文件，初始化项目及开始工作循

int main(int argc, char **argv) {
	initFileIO();//设置软件名为ONScripter-RU

#ifdef DROID
	// Attempt to launch an already running ons (by tapping on the icon) right after the installation
	// will cause the library not to be loaded and reused without state initialisation.
	// We must prevent this somehow and at any cost.
	pid_t currentPid = getpid();
	static pid_t previousPid;
	FileIO::setLogMode(FileIO::LogMode::Unspecified);
	sendToLog(LogLevel::Info, "Launched with pid %d, previous pid %d\n", currentPid, previousPid);
	if (currentPid == previousPid) {
		sendToLog(LogLevel::Error, "Detected same pids, aborting!\n");
		// We cannot call the normal exit function here since we already have broken state for many reasons.
		// Additionally a new library instance is already being loaded and we are merely awaiting a kill.
		// For this reason we just quit silently and return a successful error code.
		// We should be calling standard std::quick_exit or _Exit functions but neither is exported :/.
		// Yet according to AOSP _exit appears to be _Exit alias and it actually works.
		_exit(0);
	}
	previousPid = currentPid;
#endif

	std::atexit([]() {//当程序正常终止时，调用指定的函数 func。
		ctrl.deinit();//进行控制器的析构
	});

	requestHighMemoryUsage();//如果是ios平台,则需申请更多内存权限

	bool hasArchivePath = false;//档案路径，脚本等文件所在目录
	bool works          = false;//工作指示
#ifndef PUBLIC_RELEASE//非正式版，则打开控制台调试
	FileIO::setLogMode(FileIO::LogMode::Console); // Enable console logging in development mode
#endif
	ons.script_is_set = false;//脚本关
	if (!FileIO::setArguments(ons.argc, ons.argv, argc, argv))//将获取的命令行参数转为unicode编码
		performTerminate("Failed to obtain program arguments!");

	//Firstly, read command line options 解析命令行参数，设置游戏属性，如窗口分辨率，查看帮助等
	parseOptions(ons.argc, ons.argv, hasArchivePath);

	// --root has zero priority
	if (initWithPath(nullptr, hasArchivePath)) {//解析配置文件ons.cfg
		works = true;
	} else {
		// Try app launch dir根目录没找到配置文件，则在APP启动目录下找
		works = initWithPath(FileIO::getLaunchDir(), hasArchivePath);

		// Try app working dir
		if (!works)
			works = initWithPath(FileIO::getWorkingDir(), hasArchivePath);

		// If there is anything to try, do it
		if (!works && FileIO::getPlatformSpecificDir())
			works = initWithPath(FileIO::getPlatformSpecificDir(), hasArchivePath);
	}

	if (!works) {//找不到配置文件，则提示启动目录有误
#ifdef MACOSX
		performTerminate("Invalid launch directory!\nTry executing xattr -cr /path/to/onscripter-ru-osx.app");
#else
		performTerminate("Invalid launch directory!");
#endif
	}

	auto &opts = ons.ons_cfg_options;

	if (!FileIO::setStorageDir(opts.find("current-user-appdata") != opts.end()) ||
	    !FileIO::makeDir(FileIO::getStorageDir(opts.find("disable-icloud") == opts.end()), nullptr, true))
		performTerminate("Failed to access storage directory!");

	if (FileIO::getLogMode() == FileIO::LogMode::File) {
		std::string log_path(FileIO::getStorageDir());
		FileIO::fileHandleReopen(log_path + "out.txt", stdout);
		FileIO::fileHandleReopen(log_path + "err.txt", stderr);
	} else if (FileIO::getLogMode() == FileIO::LogMode::Console) {
		FileIO::prepareConsole(150, 30);
	}

	sendToLog(LogLevel::Info, "Available crash reporter features error code %d\n", crashReporterError);

	if (ons.init())//进行整个项目的初始化
		ctrl.quit(-1);
	ons.executeLabel();//开启循环，等待用户指令

	ctrl.quit(0);//程序退出
}