On Dec 24, 2011, at 6:11 AM, Peter Hudson wrote: > I have been making a few ( trivial ) changes to some code and when the app > runs it grinds to a halt with an > Objective-c exception and the next to last item on my stack is > > __PRETTY_FUNCTION__.219635 > > ( the top of the stack being obj_msgSend ) > > Anybody have any ideas on this one. I can't get the debugger to show me any > detail about PRETTY_FUNCTION at all.
That symbol is for a string, which is the name of the function. It's not a function itself. In C code, you can reference __FUNCTION__, __PRETTY_FUNCTION__, and __func__ in cases (usually debugging statements) where you need the name of the function. The compiler generates a string variable and the symbol for that variable is something like the above. Since it's not the name of a function, it shouldn't be on the stack. Some possible reasons that it would appear in a stack trace include: * objc_msgSend can confuse debuggers and strack tracers because it doesn't manipulate the stack pointer or frame pointer in the usual way. * Certain symbols have been stripped from your program and its libraries. The function that's actually on the stack no longer has its symbol, so its address is correlated with an arbitrary different symbol that comes earlier. This strikes me as unlikely. * The program generates new code at runtime and has called such a function. That function would have no symbol and, again, its address was just correlated with the nearest prior symbol. * The stack has been corrupted, so the stack tracer is getting bogus results. I'd recommend enabling zombies, perhaps using the Zombies template for Instruments. Also, see if Xcode's static analyzer finds any problems with your code. If neither of those turns up anything, you can sprinkle printfs or NSLog calls through the suspect code to figure out where the crash is happening. Good luck. Regards, Ken _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
