objc https://opensource.apple.com/tarballs/objc4/
runloop https://opensource.apple.com/tarballs/CF/
gcd https://github.com/apple/swift-corelibs-libdispatch
GNU libc https://www.gnu.org/software/libc/ https://ftp.gnu.org/gnu/libc/
malloc http://www.opensource.apple.com/source/libmalloc
GNUstep http://www.gnustep.org/resources/downloads.php
优化工具
https://github.com/UIControl/LXDAppFluecyMonitor
https://github.com/beiliao-mobile/BLStopwatch
https://github.com/tinymind/LSUnusedResources
https://www.jetbrains.com/objc/
第三方工具解析LinkMap文件：https://github.com/huanxsd/LinkMap
架构与设计模式
