Here I am, yet again! This week, I'm continuing where my last article left off, regarding PLCrashReporter and unwinding stack frames on x86_64. In particular, I go into how I got at and used all the various data I discussed in last week's article, and why some of the existing solutions in the wild weren't suited for our use.

I'm back once again for Friday Q&A. Today I'm going to talk about some work I recently did on PLCrashReporter, adding support for unwinding stack frames on x86_64. PLCrashReporter was originally targeted solely at iOS, where both ARM and x86-32 (the simulator) make crash reporting relatively straight-forward; we can simply walk the stack via the preserved frame pointer. On x86-64, matters are different, leading to the need to implement support for alternative methods for stack unwinding. This work was sponsored by HockeyApp, to support their upcoming release of Mac OS X sandbox-compatible crash reporting. I'll talk about DWARF debugging information, the compact unwind encoding, and stack scanners. I assume at least some knowledge of x86_64 architecture, for simplicity's sake.

I'm back again for Friday Q&A, and this week I'm going to follow up on Mike's 2008 article, Key-Value Observing Done Right, where he debuted a replacement for KVO, MAKVONotificationCenter. It's been a long time since then, and it was high time such a useful piece of code got an update, which I gave it. With the help of Mike and Tony Xiao, it's gotten a full overhaul and is now a modern code library with some fun features. In this article, I'm going to go through the new stuff and how it was done.