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LeoMobileDeveloper avatar LeoMobileDeveloper commented on July 18, 2024 3

objc代码生成objc_msgSend是在哪一步？

是在CodeGen这一步，这一步会对Objective C的runtime进行桥接，objective c的方法会被转换为objc_msgSend函数调用。 详见：深入浅出iOS编译

runtime 是不是就是动态库？

runtime是一套Objective C运行时机制，把runtime叫做动态库是不严谨的，runtime会依赖于一些动态库，核心的是libobjc.A.dylib，在操作系统的这个目录下 /usr/lib/libobjc.A.dylib。

objc_msgSend 就是runtime动态库里的方法, 最后会链接,装载成 执行文件吗？

不会，Objective C的ABI非常稳定，所以动态库libobjc.A.dylib是iOS操作系统层面提供的，不需要打包进App。链接时，可执行文件里会写入objc_msgSend来自libobjc.A.dylib，然后App启动的时候，由dyld修复objc_msgSend函数在内存中的地址。详见：深入理解iOS App的启动过程

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