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Présentation : I don't know much about Objective-C and decided to get my learn on. Here are some discoveries I made. Objective-C is dynamic. Objects and classes support some degree of introspection at runtime. Methods messages are routed and dispatched. They are not hardcoded addresses as in C . Objective-C is message oriented. All those fancy Object Oriented Message passing calls end up going through one of a few functions. When you compile self printMessageWithString Hello World it is translated to something like objc_msgSend self, selector printMessageWithString , Hello World I borrowed those snippets from http cocoasamurai.blogspot.com 2010 01 understanding-objective-c-runtime.html without permission. This is good news. It means just about every OO operation in ObjC will pass through this function. Way to make hooking tracing easy. I then asked Google if anyone else has been talking about this sort of thing. It looks like I am late to the game - http www.dribin.org dave blog archives 2006 04 22 tracing_objc . Specifically If you set the NSObjCMessageLoggingEnabled environment variable to YES , the Objective-C runtime will log all dispatched Objective-C messages to a file named tmp msgSends-. You can even enable message logging from within a debugging session using gdb call void instrumentObjcMessageSends YES It gets better. The Apple objc runtime also includes support for a custom logger. This might be useful logging the parameters of certain messages of interest. I also found good general information on reversing objc here http culater.net wiki moin.cgi CocoaReverseEngineering. New bits here are class-dump and FScript. The former will dump a header file close enough for use, the latter through FScriptAnywhere allows you to introspect and modify apps at runtime.
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