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1. Debugging Objective-C

   (gdb) break setPassword:
   (gdb) break -[Person setPassword:]
   
   (gdb) po self
   <Person: 0x10010c7a0>
   (gdb) po [invocation debugDescription]
   Some day, NSInvocation will have a useful debug
   (gdb) p (char *)_cmd
   $1 = 0x10fbb "setPassword:"
   
   (gdb) frame
   (gdb) info locals
   (gdb) info (classes|selectors) [regex]
   (gdb) list +[Person string]
   (gdb) call [self setPassword:@"welcome"]
   
   (gdb) where
   #0  0x0000b4b3 in -[AppDelegate application:didFinishLaunchingWithOptions:] (...)
   #1  0x00444c89 in -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] ()
   #2  0x00446d88 in -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] ()'),