一、JavascriptCore介绍
JavaScriptCore是一个在WebKit中提供JavaScript引擎的框架，而且在OS X作为其他内容的脚本引擎。JavaScriptCore最初是为KDE的JavaScript引擎（KJS）库及PCRE正则表达式库，JavaScriptCore从KJS及PCRE复刻之后，已比原先进步了许多，有了新的特色以及极大的性能改进。
WebCore
WebCore是一个由WebKit项目所开发的布局（Layout）、渲染（Rendering）及HTML和SVG的DOM库，完整的代码皆由GNU宽通用公共许可证所授权，WebKit框架包装了WebCore及JavaScriptCore（Nitro），并提供一个Objective-C应用程序接口来接介由C++所开发的WebCore渲染引擎及JavaScriptCore脚本引擎，透过Cocoa API就可以在应用程序中很简单的使用这些组件。之后的版本同时包含了一个跨平台的C++抽象平台，并且提供各种API使用。
WebKit中渲染采用CoreGraphics，相对Skia未利用到GPU加速能力，性能较差。
Nitro（SFX）
在2008年6月2日，WebKit项目宣布，JavaScriptCore将被重写为"SquirrelFish"，它是一个字节码解释器，这个项目演变成SquirrelFish Extreme（简称为SFX，市场称之为Nitro），首次公开于2008年9月18日，它会将Javascript编译为本地的机器语言，不再需要字节码解释器，同时加速了JavaScript的执行效率。
2009年6月30日，在Firefox 3.5发布的最新技术能“使某些情况下的速度提升20到40倍”。
从Safari 4 Beta开始采用，在Safari 5中进行了优化。
在Safari 5刚发布时，Nitro在Mac上执行JavaScript的速度比之前Safari 4快40%，比Chrome 5快3%，并且是Firefox 3.6的两倍以上。
JIT
JIT（Just In Time）编译器：是指程序逻辑以代码（或字节码）形式下发到目标机（如客户端）上，在系统即将运行此逻辑的前一刻，目标机系统上的编译器才将这些代码编译成机器指令，然后再交给系统执行。因为它的编译发生成运行前一刻，刚刚能赶得上执行，所以叫做Just In Time编译器。
JavascriptCore framework
iOS中WebKit使用的js解释引擎是Nitro（或者叫做重写的JavascriptCore）。但内置JavascriptCore framework是个阉割版本，不支持JIT及WASM，setTimeout等。因为不支持JIT，通信性能表现略差。
JSI
JSI 的全称是 JavaScript Interface，即 JS Interface 接口，它是对 JS引擎 与 Native (C++) 之间相互调用的封装，通过 HostObject 接口实现双边映射，官方也称它为映射框架。
有了这层封装，在 ReactNative 中有了两方面的提升：
可以自由切换引擎，比如: JavaScriptCore、V8、Hermes等。
在 JS 中调用 C++ 注入到 JS 引擎中的方法，数据载体格式是通过 HostObject 接口规范化后的，摒弃了旧架构中以 JSON 作为数据载体的异步机制，从而使得 JS 与 Native 之间的调用可以实现同步感知。
JSI 与 JSC(不是JavaScriptCore脚本引擎) 对比
相同点：
首先在底层实现上来说，JSI 与 JSC 都是通过向 JS 引擎中注入方法，来实现的 JS 与 Native 通信，同时 注入的方法也都是挂载到了 JS global 全局对象上面。
不同点：
旧架构中的 JSC 处理的注入对象是JSON 对象与C++ 对象，内部涉及复杂且频繁的类型转换。且在
JSBridge 这种异步传输的设计中存在三个线程之间的通信：UI线程、Layout线程、JS线程，在典型的列表快速滑动时出现空白页的例子中，效率低下得到明显的体现。
而对于 JSI 来讲，弃用了异步的bridge，传输的数据也不再依赖于 JSON 的数据格式，而是将HostObject 接口作为了双边通信的协议，实现了双边同步通信下的高效信息传输。
另外编写 NativeModule 的方式与旧架构中相比发生了改变，除了功能之外的逻辑，需要在一个 C++ 类中来完成。 因此，一个 TurboModule 的实现分为两部分: C++ & Java (OC)。
一句话概括 JSI 提效的本质： JSI 实现了通信桥 Bridge 的自定义，并通过 HostObjec 接口协议的方式取代了 旧架构中基于异步 bridge 的JSON数据结构，从而实现了同步通信，并且避免了 JSON 序列化与反序列化的繁琐操作，大大提升了 JS 与 Native 的通信效率。
重点总结
WebKit（WKWebView）的一个缺点是渲染是通过CoreGraphics实现，CoreGraphics渲染主要运算工作在CPU运行，并没有充分利用GPU的硬件加速能力。因此在一些复杂或者大量的图形绘制任务时表现性能比较差。像flutter的渲染是通过skia完成，相比webkit提升了渲染能力。（可参考：webGL调研（iOS渲染原理））
WebKit的另一个缺点是过于庞大，加载慢。目前小程序每个页面都创建对应的一个webview，会造成很大的性能浪费。
WebKit内置的JSCore是支持JIT，但是对外提供的JSCore framework却不支持JIT，所以这导致了JSCore framework在通信上的表现比较差。
参考资料：
https://zh.wikipedia.org/wiki/WebKit
https://zh.wikipedia.org/wiki/JavaScript%E5%BC%95%E6%93%8E#%E5%81%9C%E6%AD%A2%E9%96%8B%E7%99%BC
https://trac.webkit.org/browser/webkit/trunk/Source/JavaScriptCore?order=name
https://trac.webkit.org/wiki/JavaScriptCore
https://www.jianshu.com/p/b5c6207edb98/
二、Skyline介绍
介绍：https://developers.weixin.qq.com/miniprogram/dev/framework/runtime/skyline/introduction.html
三、Skyline分析
下图为未使用Skyline的小程序视图层级：
下图为使用了Skyline的微信小程序视图层级：
下面两图为基本的flutter iOS原生混合项目的内存计数及视图层级：
WAFlutterViewController继承自FlutterViewController。
@interface WAFlutterViewController : FlutterViewController
可以得出：
- Flutter开头的相关类都是flutter自动生成，包括FlutterView，FlutterViewController，FlutterEngine等，而不是微信自身实现。
- 微信Skyline用SkylineView代替了webview，但skylineView的渲染都是由flutter自身实现。
支持skyline的版本中，pageVC中增加了一个skylineView属性，比起webView多支持IWASkylineView接口：
@property(retain, nonatomic) UIView<YYWebViewInterface> *webView;
@property(retain, nonatomic) UIView<IWASkylineView><YYWebViewInterface> *skylineView;
pageVC中和Skyline相关的方法及用法（个人理解）：
处理路由事件navigateBack
- (void)notifySkylineNavigateBack:(long long)arg1 animated:(_Bool)arg2;
自动处理ReLaunch路由事件
- (void)notifySkylineAutoReLaunch;
处理ReLaunch路由事件
- (void)notifySkylineReLaunch;
处理RedirectTo路由事件
- (void)notifySkylineRedirectTo;
处理NavigateTo路由事件
- (void)notifySkylineNavigateTo;
处理暗黑模式变化
- (void)notifySkylineDarkModeUpdate;
处理SwitchTab
- (void)notifySkylineSwitchTab;
处理AppLaunch
- (void)notifySkylineAppLaunch;
获取Skyline相关页面数据
- (id)getSkylineSinglePageData:(_Bool)arg1;
设置Skyline相关页面数据
- (void)setSkylineSinglePageRouteData:(id)arg1;
找回skyline View？
- (void)findBackSkylineView;
IWASkylineView接口定位如下：
@protocol IWASkylineView
@property(nonatomic) _Bool innerPopAnim;
@property(nonatomic) long long innerPopCnt;
@property(nonatomic) _Bool isNewEngineHomePage;
@property(readonly, nonatomic) _Bool isReady;
@property(readonly, nonatomic) long long windowId;
@property(nonatomic) __weak id <IWASkylineRuntime> skylineRuntime;
- (void)snapshotEnd;
- (void)snapshotBegin;
- (UIImage *)snapshotSkyline;
- (void)removeNativeView:(long long)arg1;
- (void)insertNativeView:(UIView *)arg1 viewId:(long long)arg2;
- (void)startMoveViewToOldPage;
- (void)startMoveViewToNewPage;
@end
WASkylineView的声明如下，可以看到还实现了FlutterEngineDelegate，说明内部渲染应该是通过flutter引擎实现。
@interface WASkylineView : UIView <FlutterEngineDelegate, IWASkylineView, YYWebViewInterface>
skyline处理在页面跳转时，函数调用栈如下。loadIndexData会在执行IndexData之前，发送路由事件并通知skylineView。
小程序进入新页面会分别交给skylineView执行5个脚本。
从方法名来看分别是mainPluginPageFrame,MainModuleSharedCommonJS,文件moduleScriptData，和之前发给webview作为page层的js基本上一致。
skylineView持有了 WASkyLineRuntime的弱引用，强引用持有了WAFlutterViewController。
从视图层级可以看出，skylineView addSubView: WAFlutterViewController.FlutterView（伪代码）。
@property(nonatomic) __weak WASkyLineRuntime *runtime; // @synthesize runtime=_runtime;
@property(nonatomic) __weak id <IWASkylineRuntime> skylineRuntime; // @synthesize skylineRuntime=_skylineRuntime;@property(retain, nonatomic) WAFlutterViewController *flutterVC; // @synthesize flutterVC=_flutterVC
目前实现IWASkylineRuntime接口的类只有WASkyLineRuntime。
@interface WASkyLineRuntime : NSObject <IWASkylineRuntime>
分析：
skylineView在收到js脚本后，从逆向来看并未交给其它OC类来进行处理，个人认为可能调用了C/C++代码进行解析（因为逆向暂时获取不到C/C++方法）。C/C++解析后的结果再交给Flutter进行渲染。
JSCore的预创建
微信启动到聊天页面，还未进入小程序前，JSCoreService已经被创建((WAJSCoreService *)0x129b53cd0)。
服务中心MMServiceCenter管理微信内的所有服务：
@interface MMServiceCenter : NSObject
{
NSMutableDictionary *m_dictService;
}
服务如下，其中包括WAPreloadAppTaskMgr，小程序预加载任务管理服务。
每个服务受到了MMServiceWrapper包裹，并在MMServiceWrapper内重写了消息转发，将消息转发给WAPreloadAppTaskMgr。
{
UpdateProfileMgr = "<UpdateProfileMgr: 0x281d4bcc0>";
WCCommonService = "<WCCommonService: 0x280b2c9c0>";
MultiTalkSessionMgr = "<MultiTalkSessionMgr: 0x286561d60>";
WCTimelineTrashMgr = "<WCTimelineTrashMgr: 0x282631900>";
WCLabsMgr = "<WCLabsMgr: 0x282cd46c0>";
TrackRoomMgr = "<TrackRoomMgr: 0x28312eb50>";
MMWebPrefetcherMgr = "<MMWebPrefetcherMgr: 0x282e71260>";
WAConfigMgr = "<WAConfigMgr: 0x28390a940>";
WCPayLogicMgr = "<WCPayLogicMgr: 0x12e637a00>";
EmoticonInputRecommendMgr = "<EmoticonInputRecommendMgr: 0x28314ab50>";
WXCTalkMgr = "<WXCTalkMgr: 0x283f6a760>";
WCTextStateDB = "<WCTextStateDB: 0x282cdfa80>";
MMClientCacheManager = "<MMClientCacheManager: 0x280adb510>";
OpenApiMgr = "<OpenApiMgr: 0x11e4d59e0>";
VoIPOrientationService = "<VoIPOrientationService: 0x281d97300>";
MMMsgRemindReporter = "<MMMsgRemindReporter: 0x282c9ad00>";
MMFICImageCache = "<MMFICImageCache: 0x2811038a0>";
QuickReplyMsgMgr = "<QuickReplyMsgMgr: 0x282d499d0>";
WAContactMgr = "<WAContactMgr: 0x282e51c70>";
CdnComMgr = "<CdnComMgr: 0x2826340a0>";
MMTextLayoutManager = "<MMTextLayoutManager: 0x283730b40>";
WCSiriMgr = "<WCSiriMgr: 0x28656d3b0>";
RebootWarningService = "<RebootWarningService: 0x28023e1a0>";
MMNewSessionMgr = "<MMNewSessionMgr: 0x283d36f20>";
WAPackageDownloadUrlFetcher = "<WAPackageDownloadUrlFetcher: 0x2865a75c0>";
WCFinderVideoDownLoadMgr = "<WCFinderVideoDownLoadMgr: 0x283d43cf0>";
WCTempChatMgr = "<WCTempChatMgr: 0x281c8a380>";
WCFinderSyncReportMgr = "<WCFinderSyncReportMgr: 0x2865096d0>";
WCGroupUndoneMgr = "<WCGroupUndoneMgr: 0x28657db30>";
FTSFacade = "<FTSFacade: 0x283f26920>";
WCAdvertiseLogMgr = "<WCAdvertiseLogMgr: 0x28650ab20>";
VoIPRMRemoteService = "<VoIPRMRemoteService: 0x281d96e80>";
MsgVideoPreloadMgr = "<MsgVideoPreloadMgr: 0x28004d5e0>";
WASessionMgr = "<WASessionMgr: 0x2811ce2b0>";
MMFinderLiveGiftResourceCDNMgr = "<MMFinderLiveGiftResourceCDNMgr: 0x282dabd40>";
WCWebSearchService = "<WCWebSearchService: 0x282d32a00>";
MiniTaskUIMgr = "<MiniTaskUIMgr: 0x282ca5740>";
CheckMobileSIMType = "<CheckMobileSIMType: 0x2825d2fd0>";
EventService = "<EventService: 0x281d1f6c0>";
WeVisModelResMgr = "<WeVisModelResMgr: 0x28024f5c0>";
TingManager = "<TingManager: 0x283731040>";
KFContactMgr = "<KFContactMgr: 0x281c8a340>";
MinimizeRecMgr = "<MinimizeRecMgr: 0x286583070>";
WXCTalkPresentMgr = "<WXCTalkPresentMgr: 0x281c9ddc0>";
WAPublicResCacheMgr = "<WAPublicResCacheMgr: 0x28344ba80>";
WXTalkPresentMgr = "<WXTalkPresentMgr: 0x281012d90>";
WCFinderReportService = "<WCFinderReportService: 0x286508f00>";
WCDurationLogMgr = "<WCDurationLogMgr: 0x281cb8700>";
MMShareExtMgr = "<MMShareExtMgr: 0x2825bce60>";
FriendAsistSessionMgr = "<FriendAsistSessionMgr: 0x2811494a0>";
AppDataMgr = "<AppDataMgr: 0x283147910>";
VOIPMgr = "<VOIPMgr: 0x11eb8f000>";
WXGRoamService = "<WXGRoamService: 0x282929e00>";
MMWebViewKeepHolderMgr = "<MMWebViewKeepHolderMgr: 0x28372a080>";
MainFrameGroupLiveReporter = "<MainFrameGroupLiveReporter: 0x28112b570>";
EnterpriseBrandContactMgr = "<EnterpriseBrandContactMgr: 0x2800433c0>";
WCCardPkgMgr = "<WCCardPkgMgr: 0x2833c2580>";
CContactMgr = "<CContactMgr: 0x2831109a0>";
MagicPkgCheckListener = "<MagicPkgCheckListener: 0x281d26080>";
VoIPMSService = "<VoIPMSService: 0x286581540>";
WCDeviceBrandMgr = "<WCDeviceBrandMgr: 0x28332bcc0>";
NewSyncPluginMgr = "<NewSyncPluginMgr: 0x2811862b0>";
WCDeviceAccountMgr = "<WCDeviceAccountMgr: 0x281148930>";
MMOnlineDeviceStatusMgr = "<MMOnlineDeviceStatusMgr: 0x28260d2c0>";
StoreEmotionBackupMgr = "<StoreEmotionBackupMgr: 0x2811a2ca0>";
ExptService = "<ExptService: 0x28287b480>";
SendMessageMgr = "<SendMessageMgr: 0x282cfd140>";
EmoticonCameraRecoverMgr = "<EmoticonCameraRecoverMgr: 0x281d9d340>";
MMWebDebugPkgMgr = "<MMWebDebugPkgMgr: 0x2811cbe70>";
VoIPEventLogService = "<VoIPEventLogService: 0x2802329e0>";
IDCHostMgr = "<IDCHostMgr: 0x281d97240>";
WCFinderLongVideoService = "<WCFinderLongVideoService: 0x281d9ca00>";
MiniGameVideoService = "<MiniGameVideoService: 0x281d24940>";
HeartBeatMgr = "<HeartBeatMgr: 0x281d94100>";
MMNewTipsMgr = "<MMNewTipsMgr: 0x281ceda40>";
WeVisSettingsMgr = "<WeVisSettingsMgr: 0x282dbd180>";
QQMailMgr = "<QQMailMgr: 0x286589e50>";
VoiceReminderMgr = "<VoiceReminderMgr: 0x2811cca50>";
WACacheVersionPreCheckerMgr = "<WACacheVersionPreCheckerMgr: 0x2865b0230>";
MPPageMessageMgr = "<MPPageMessageMgr: 0x2811cc150>";
WCJdBussinessMgr = "<WCJdBussinessMgr: 0x281cb2900>";
GameCenterManager = "<GameCenterManager: 0x283a2d500>";
StoreEmotionRecoverMgr = "<StoreEmotionRecoverMgr: 0x282cf5fe0>";
MMLiveDBMgr = "<MMLiveDBMgr: 0x280912fa0>";
WCFinderDataService = "<WCFinderDataService: 0x11e4dacd0>";
BrandNewSessionMgr = "<BrandNewSessionMgr: 0x282cf7cc0>";
MMSUserBehaviorMgr = "<MMSUserBehaviorMgr: 0x2801dce80>";
AudioReceiver = "<AudioReceiver: 0x281d26200>";
WADatabaseMgr = "<WADatabaseMgr: 0x283a64c00>";
WCSessionFlowMgr = "<WCSessionFlowMgr: 0x283d255f0>";
FavoritesMgr = "<FavoritesMgr: 0x2833692c0>";
MinimizeTaskMgr = "<MinimizeTaskMgr: 0x283399a40>";
MMEnterpriseBrandSessionMgr = "<MMEnterpriseBrandSessionMgr: 0x2811cc120>";
CGroupMgr = "<CGroupMgr: 0x2828d1000>";
WALoadPerformanceMgr = "<WALoadPerformanceMgr: 0x2862218c0>";
MMGroupLiveDBMgr = "<MMGroupLiveDBMgr: 0x2817ea4c0>";
MMPackageDownloadMgr = "<MMPackageDownloadMgr: 0x2825d33e0>";
StrongNotificationMgr = "<StrongNotificationMgr: 0x282275b00>";
MMFinderLiveRewardDBMgr = "<MMFinderLiveRewardDBMgr: 0x280913420>";
WCHardLinkService = "<WCHardLinkService: 0x28122e2e0>";
NewSyncService = "<NewSyncService: 0x282882a00>";
BrandSessionMgr = "<BrandSessionMgr: 0x282cf7240>";
MMFinderLiveMgr = "<MMFinderLiveMgr: 0x283735220>";
WCWatchNativeMgr = "<WCWatchNativeMgr: 0x2822704e0>";
BrandTLCanvasCardMgr = "<BrandTLCanvasCardMgr: 0x281248d80>";
ChatBoxMgr = "<ChatBoxMgr: 0x281d893c0>";
TemplateSessionMgr = "<TemplateSessionMgr: 0x282da9ea0>";
BrandAttrMgr = "<BrandAttrMgr: 0x281d9f600>";
SearchCgiConfigMgr = "<SearchCgiConfigMgr: 0x281d49c00>";
WeVisionCameraLogger = "<WeVisionCameraLogger: 0x28024f6c0>";
WCPaySynthesizeSpeechMgr = "<WCPaySynthesizeSpeechMgr: 0x2825d0410>";
ImageAutoDownloadMgr = "<ImageAutoDownloadMgr: 0x286588140>";
MPChannelMgr = "<MPChannelMgr: 0x28112a640>";
FunctionMsgMgr = "<FunctionMsgMgr: 0x281c95940>";
"WeChat.GOGService" = "<WeChat.GOGService: 0x281056850>";
OCRTransMgr = "<OCRTransMgr: 0x2825d2bc0>";
CMessageMgr = "<CMessageMgr: 0x12e420300>";
WCAudioSessionLogic = "<WCAudioSessionLogic: 0x280769260>";
WCRedEnvelopesControlMgr = "<WCRedEnvelopesControlMgr: 0x281138a80>";
iAPMgr = "<iAPMgr: 0x28656a580>";
MMHeavyUserMonitorMgr = "<MMHeavyUserMonitorMgr: 0x282d174f0>";
WCSessionFlowMonitorService = "<WCSessionFlowMonitorService: 0x282d47330>";
WXGBackupMgr = "<WXGBackupMgr: 0x283f0a840>";
NotificationActionsMgr = "<NotificationActionsMgr: 0x286515c20>";
DeviceILinkService = "<DeviceILinkService: 0x281d97ec0>";
WCNewClickStatMgr = "<WCNewClickStatMgr: 0x283434ea0>";
MMLiteAppDBMgr = "<MMLiteAppDBMgr: 0x2825f4820>";
WACommonMarkMgr = "<WACommonMarkMgr: 0x280a3a010>";
WCAutoSaveService = "<WCAutoSaveService: 0x280773a40>";
TokenRegisterService = "<TokenRegisterService: 0x28650ac10>";
MMWindowMgr = "<MMWindowMgr: 0x28105ba50>";
PushLoginURLMgr = "<PushLoginURLMgr: 0x280ae4fc0>";
GameCenterCommonDb = "<GameCenterCommonDb: 0x280b1fa50>";
SystemAuthorizationCheck = "<SystemAuthorizationCheck: 0x2800aeda0>";
DarkModeManager = "<DarkModeManager: 0x2817292c0>";
MMAuthService = "<MMAuthService: 0x28227cb40>";
VoIPFirstMessageStatisticsService = "<VoIPFirstMessageStatisticsService: 0x280adb870>";
MMConfigMgr = "<MMConfigMgr: 0x282d46d80>";
NewArrivalCountMgr = "<NewArrivalCountMgr: 0x2811cc720>";
WCGPUCounterSamplingMgr = "<WCGPUCounterSamplingMgr: 0x282c9daa0>";
DeviceModelConfigMgr = "<DeviceModelConfigMgr: 0x281158780>";
WWKFSessionMgr = "<WWKFSessionMgr: 0x2811cda40>";
WCTopicService = "<WCTopicService: 0x282c9b000>";
MMGroupLiveMgr = "<MMGroupLiveMgr: 0x286578ff0>";
MMConfSDKService = "<MMConfSDKService: 0x12e4adb90>";
MMLiveReportEventMgr = "<MMLiveReportEventMgr: 0x281035e60>";
AccountStorageMgr = "<AccountStorageMgr: 0x28227c780>";
FingertipSearchMgr = "<FingertipSearchMgr: 0x282642a80>";
MMHeadImageMgr = "<MMHeadImageMgr: 0x281d0a380>";
EnterpriseSessionMgr = "<EnterpriseSessionMgr: 0x286589d10>";
PresentHelperMgr = "<PresentHelperMgr: 0x280ac6700>";
MainSessionMgr = "<MainSessionMgr: 0x28260ce10>";
TextStateMgr = "<TextStateMgr: 0x283f457a0>";
SolitaireMgr = "<SolitaireMgr: 0x2825d3250>";
MonoServiceMsgMgr = "<MonoServiceMsgMgr: 0x2825f7930>";
BannerToastMgr = "<BannerToastMgr: 0x2813d0940>";
AutoSetRemarkMgr = "<AutoSetRemarkMgr: 0x286554eb0>";
FavoritesOnTopLogic = "<FavoritesOnTopLogic: 0x2813d0480>";
VoIPPMService = "<VoIPPMService: 0x282dbd880>";
WePkgFacade = "<WePkgFacade: 0x283145130>";
DataReportExposeMonitor = "<DataReportExposeMonitor: 0x28313eec0>";
MuteBrandMgr = "<MuteBrandMgr: 0x2811bba20>";
MsgSolitaireDB = "<MsgSolitaireDB: 0x281d77380>";
MMDBMigrationUtil = "<MMDBMigrationUtil: 0x280aeb450>";
IntelligentMsgImgConfigurationMgr = "<IntelligentMsgImgConfigurationMgr: 0x281cfd5c0>";
EmoticonRecommendMgr = "<EmoticonRecommendMgr: 0x281d25280>";
DataReportPageConfig = "<DataReportPageConfig: 0x281d4b440>";
WCCalRqtDataMgr = "<WCCalRqtDataMgr: 0x280165b00>";
WAProfileService = "<WAProfileService: 0x281e3f800>";
WALaunchTimeAxisMgr = "<WALaunchTimeAxisMgr: 0x282913e00>";
MMResPackageMgr = "<MMResPackageMgr: 0x281149470>";
WCFileBrowseService = "<WCFileBrowseService: 0x2828cc880>";
MMMusicPlayerMgr = "<MMMusicPlayerMgr: 0x28344a1c0>";
VOIPMessageMgr = "<VOIPMessageMgr: 0x2811cc000>";
EnterpriseMsgMgr = "<EnterpriseMsgMgr: 0x282927180>";
WXGMigrationClientMgr = "<WXGMigrationClientMgr: 0x283d37260>";
BrandFinderLiveMgr = "<BrandFinderLiveMgr: 0x2828c3e80>";
WALaunchResourceFetcher = "<WALaunchResourceFetcher: 0x281248480>";
EmoticonBackUpMgr = "<EmoticonBackUpMgr: 0x281d9d100>";
"WeChat.Kara" = "<WeChat.Kara: 0x2817fccc0>";
WABackgroundFetchMgr = "<WABackgroundFetchMgr: 0x2801dcf80>";
WePkgStatReport = "<WePkgStatReport: 0x280add590>";
WCTuringMgr = "<WCTuringMgr: 0x28111b750>";
AUAudioDevice = "<AUAudioDevice: 0x12e4639b0>";
WCOutFacade = "<WCOutFacade: 0x283151290>";
MMLanguagePackageDownloadMgr = "<MMLanguagePackageDownloadMgr: 0x281155860>";
GameLifeDataService = "<GameLifeDataService: 0x286588af0>";
WAOpenEventSpeedStatMgr = "<WAOpenEventSpeedStatMgr: 0x283a69f00>";
WCNearbyMgr = "<WCNearbyMgr: 0x281145530>";
BrandTimelineMsgMgr = "<BrandTimelineMsgMgr: 0x12e60c8f0>";
VideoRingAudioFileProducer = "<VideoRingAudioFileProducer: 0x281daec40>";
"WeChat.PredownloadService" = "<WeChat.PredownloadService: 0x281035b00>";
VOIPModelResMgr = "<VOIPModelResMgr: 0x280230f80>";
SightFacade = "<SightFacade: 0x28391e940>";
VoipCSUIManager = "<VoipCSUIManager: 0x281d74340>";
MMLocationMgr = "<MMLocationMgr: 0x282894100>";
MMWebCanvasPkgMgr = "<MMWebCanvasPkgMgr: 0x281e2e500>";
WAAppItemManager = "<WAAppItemManager: 0x281c9d4c0>";
VoIPMiniInAppService = "<VoIPMiniInAppService: 0x281d978c0>";
MMDiskUsageMgr = "<MMDiskUsageMgr: 0x282ca4a20>";
WAPreloadAppTaskMgr = "<WAPreloadAppTaskMgr: 0x281260ae0>";
MainFrameHideSessionReporter = "<MainFrameHideSessionReporter: 0x28652f7a0>";
MMLiteAppMgr = "<MMLiteAppMgr: 0x283430120>";
WSRecommendMgr = "<WSRecommendMgr: 0x283f4c000>";
KindaBizMgr = "<KindaBizMgr: 0x280a81b00>";
WCSettingRedPointMgr = "<WCSettingRedPointMgr: 0x28113d590>";
DataReportService = "<DataReportService: 0x282d46fb0>";
WCUpdateBootsMgr = "<WCUpdateBootsMgr: 0x281d25d80>";
WAAppTaskMgr = "<WAAppTaskMgr: 0x28342de60>";
EdgeComputingMgr = "<EdgeComputingMgr: 0x282d3aca0>";
MMLiveTaskMgr = "<MMLiveTaskMgr: 0x12e63ac30>";
MMMyChatRoomSessionMgr = "<MMMyChatRoomSessionMgr: 0x281066c70>";
VoipUIManager = "<VoipUIManager: 0x11e4ac4c0>";
MMUserDataOperateDB = "<MMUserDataOperateDB: 0x280b45590>";
WXCNetWorkEngine = "<WXCNetWorkEngine: 0x2813c9440>";
BrandService = "<BrandService: 0x282d46530>";
MultiTalkMgr = "<MultiTalkMgr: 0x12e46a0d0>";
WALocalCacheMgr = "<WALocalCacheMgr: 0x281e4b980>";
WCAccountControlMgr = "<WCAccountControlMgr: 0x282d3f480>";
WXGMigrationMgr = "<WXGMigrationMgr: 0x28650aad0>";
WAUpdatableMsgMgr = "<WAUpdatableMsgMgr: 0x2811cca80>";
MMLiveResUpdateMgr = "<MMLiveResUpdateMgr: 0x280913450>";
WCMomentsMediaPredictor = "<WCMomentsMediaPredictor: 0x280b217a0>";
WCCoinMgr = "<WCCoinMgr: 0x2813b7f40>";
TrackPresentMgr = "<TrackPresentMgr: 0x28103cc30>";
MonoServiceMgr = "<MonoServiceMgr: 0x286580fa0>";
WCPreparedUpdateMgr = "<WCPreparedUpdateMgr: 0x281035a10>";
AudioSender = "<AudioSender: 0x282c9c9c0>";
FavoritesFileMgr = "<FavoritesFileMgr: 0x281782a30>";
MMWebJsWAPkgMgr = "<MMWebJsWAPkgMgr: 0x2812a1c50>";
CNetworkStatusMgr = "<CNetworkStatusMgr: 0x282882980>";
BypSyncService = "<BypSyncService: 0x282cecfc0>";
WACampusVoipMsgMgr = "<WACampusVoipMsgMgr: 0x2825f6530>";
MainFrameCellDataManager = "<MainFrameCellDataManager: 0x280acb330>";
WCCanvasDownloadMgr = "<WCCanvasDownloadMgr: 0x28004f8a0>";
WCFacade = "<WCFacade: 0x11e79dbc0>";
WCMallLogicMgr = "<WCMallLogicMgr: 0x281d25b40>";
PublicWifiManager = "<PublicWifiManager: 0x2833118c0>";
CEmoticonMgr = "<CEmoticonMgr: 0x2865399a0>";
WCFinderMsgSessionMgr = "<WCFinderMsgSessionMgr: 0x282e374f0>";
NewABTestLogic = "<NewABTestLogic: 0x281cc5d00>";
FavWebCacheMgr = "<FavWebCacheMgr: 0x283734aa0>";
WAPrefetchMgr = "<WAPrefetchMgr: 0x282e32990>";
MMAddressBookMgr = "<MMAddressBookMgr: 0x282cb9a40>";
DataReportMultiEventMonitor = "<DataReportMultiEventMonitor: 0x280a74b70>";
MsgUploadRetryMgr = "<MsgUploadRetryMgr: 0x281197bd0>";
WCPayReporter = "<WCPayReporter: 0x286582d50>";
WCSessionDataReporter = "<WCSessionDataReporter: 0x28342ee20>";
WCShareCardMgr = "<WCShareCardMgr: 0x28292f900>";
MMLiveMgr = "<MMLiveMgr: 0x281da0fc0>";
MainSessionReporter = "<MainSessionReporter: 0x282ca40c0>";
IlinkAppContextService = "<IlinkAppContextService: 0x281d95a00>";
VideoRingDataService = "<VideoRingDataService: 0x282d3dff0>";
EmoticonPackageMgr = "<EmoticonPackageMgr: 0x28653ab20>";
WCFinderSyncManager = "<WCFinderSyncManager: 0x281d10b00>";
OnlineClientMgr = "<OnlineClientMgr: 0x28343f060>";
VoIPTerminationService = "<VoIPTerminationService: 0x281051320>";
WATemplateMsgManager = "<WATemplateMsgManager: 0x282286ca0>";
WABluetoothDeviceMonitorMgr = "<WABluetoothDeviceMonitorMgr: 0x286580eb0>";
ScanQRCodeResultsMgr = "<ScanQRCodeResultsMgr: 0x281d76f00>";
VoIPAPNSPushSyncService = "<VoIPAPNSPushSyncService: 0x281053c60>";
WAPreDownloadMgr = "<WAPreDownloadMgr: 0x282e70000>";
EnterpriseContactMgr = "<EnterpriseContactMgr: 0x282933b80>";
WeVisModelMgr = "<WeVisModelMgr: 0x2865877f0>";
MMLimitedModeMgr = "<MMLimitedModeMgr: 0x282241560>";
NewABTestMgr = "<NewABTestMgr: 0x280a3b0f0>";
WAAdapterMgr = "<WAAdapterMgr: 0x280a3a3a0>";
MMUserDataOperateMgr = "<MMUserDataOperateMgr: 0x281daea80>";
MMSessionRefreshService = "<MMSessionRefreshService: 0x281d0b4c0>";
VoIPRMLocalService = "<VoIPRMLocalService: 0x281d96f80>";
}
WAPreloadAppTaskMgr如下，里面包含一个WAPreloadAppTask小程序加载任务。
@interface WAPreloadAppTaskMgr : MMUserService <MMServiceProtocol>
{
WAPreloadAppTask *_preloadTask;
}
预加载任务会预创建WAJSCoreService。
@interface WAPreloadAppTask : NSObject
{
WAApptaskPublicResLogic *_publicResLogic;
WAWebViewController *_webView;
WAJSCoreService *_appService;
}
调用栈如下，微信在启动后通过performSelector:afterDelay:延迟调用，预创建小程序service。
当微信进入最近小程序页面，微信又预创建了小游戏的service。
<WAJSGameService: 0x13769bea0>
WAFlutterMgr
WAFlutterMgr负责管理flutter，包含唯一个flutter引擎(FlutterEngine)，及多个skylineRuntime。
@interface WAFlutterMgr : MMRootService <MMServiceProtocol>
@property(retain, nonatomic) NSMutableArray *skylineRuntimeArr; // @synthesize skylineRuntimeArr=_skylineRuntimeArr;
@property(retain, nonatomic) FlutterEngine *firstEngine; // @synthesize firstEngine=_firstEngine;
@property(retain, nonatomic) FlutterEngineGroup *engineGroup; // @synthesize engineGroup=_engineGroup;
- (void)removeSkylineRuntime:(id)arg1;
- (void)addSkylineRuntime:(id)arg1;
- (id)makeSkylineEngine:(id)arg1;
启动时，flutter引擎会创建一系列flutter管道（FlutterMethodChannel），
包括flutter/platform_views,flutter/navigation,
fllutter/platform,
flutter/textinput,
flutter/localization等
补充：
SkylineGlobal
SkylineRuntimeCore
workletModule
SkylineGlobal.runtime.registerJsValue
SkylineGlobal.workletModule.stopMappers
onSkylineGlobalReady
以上绑定的关键对象或方法在逆向OC代码都找不到对应的，可能对应的实现在C++中，就像JSI。
JSCore提供封装C api后的面向对象JSExport方式，js对象与oc对象绑定，但这种方式效率比较低。
目前小游戏是采用JSCore C api + runtime模拟成JSExport的绑定对象方式，这种方式可以利用C api的效率更高，又可以利用对象绑定的编码便捷。
我估计微信可能采用的是类似JSI方式，绑定的对象在C++中处理，因此逆向找不到相关类（逆向只看的到OC）。
JSI相关资料：
https://blog.csdn.net/ImagineCode/article/details/125148600
https://blog.csdn.net/m0_49508485/article/details/122622251
https://blog.csdn.net/YoungOne2333/article/details/122962607
