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1. Trace Objective-C messages

   $ cat objc_calls.d
   pid$target::*ClassDisplay*:entry {}
   pid$target::*ClassDisplay*:return {}
   

   Trace Objective-C messages on Class Display

   $ sudo dtrace -s objc_calls.d -F -c ./RuntimeBrowser
   dtrace: script 'objc_calls.d' matched 64 probes
   CPU FUNCTION
     0  -> +[ClassDisplay classDisplayWithClass:]
     0    -> -[ClassDisplay setRepresentedClass:]
     0    <- -[ClassDisplay setRepresentedClass:]
     0  <- +[ClassDisplay classDisplayWithClass:]
     0  -> -[ClassDisplay setDisplayPropertiesDefaultValues:]
     0  <- -[ClassDisplay setDisplayPropertiesDefaultValues:]
     0  -> -[ClassDisplay header]
     0    -> -[ClassDisplay setRefdClasses:]
     0    <- -[ClassDisplay setRefdClasses:]
   (...)