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1. Tracing Objective-C messages

   $ NSObjCMessageLoggingEnabled=YES /Library/XcodeBuilds/Debug/HelloWorld 
   2009-02-04 10:54:41.728 HelloWorld[39133:10b] Hello, World!
   
   $ cat /tmp/msgSends-39133 
   + NSRecursiveLock NSObject initialize
   + NSRecursiveLock NSObject new
   + NSRecursiveLock NSObject alloc
   ...
   

   Tracing can be activated selectively in code:

   #import <objc/runtime.h>
   
   instrumentObjcMessageSends(YES);
   // messages will be traced here
   instrumentObjcMessageSends(NO);