We're back! During the week of WWDC, I spoke at CocoaConf Next Door, and one of my talks involved a dissection of objc_msgSend's ARM64 implementation. I thought that turning it into an article would make for a nice return to blogging for Friday Q&A. Overview Every Objective-C object has a class, and every Objective-C class has a list of methods. Each method has a selector, a function pointer to th