I am debugging a random SIGTRAP error right now, which is happening only in the background. This is probably something that is related to NSManagedObjectContext somewhere.
Also, I'm trying to debug it using an exception breakpoint to at least figure out where it came from. The only problem is that the error / breakpoint occurs at 0 objc_exception_throw, which does not help me.
The returned data is as follows:
libobjc.A.dylib`objc_exception_throw: 0x32a3a960: push {r4, r5, r6, r7, lr} // breakpoint stops here 0x32a3a962: add r7, sp,
So my question is, how can I create an exception checkpoint to start myself earlier? I am trying to make a breakpoint in the last bit of the actual Objective-C code before the failure.
I tried editing the breakpoint for sharing, breaking the cast, then breaking the catch and changing the type of exception between Objective-C, C ++ and "all" without any luck.
How can I throw an exception point earlier?
If there is a way to decrypt the code I entered. If possible, please give me a brief explanation of what this means and how you decoded it so that I can also learn this :)
Thanks everyone!
If I run the program ...
It continues to crash, which looks like this:
libsystem_kernel.dylib`mach_msg_trap: 0x30830ea0: mov r12, sp 0x30830ea4: push {r4, r5, r6, r8} 0x30830ea8: ldm r12, {r4, r5, r6} 0x30830eac: mvn r12,
Stack trace when running the bt command as a debugger command
* thread #13: tid = 0x2337, 0x32a3a960 libobjc.A.dylib`objc_exception_throw, stop reason = breakpoint 1.1 frame #0: 0x32a3a960 libobjc.A.dylib`objc_exception_throw frame #1: 0x340f9fee CoreData`-[NSPersistentStoreCoordinator executeRequest:withContext:error:] + 298 frame #2: 0x341522d2 CoreData`-[NSManagedObjectContext save:] + 730 frame #3: 0x32054b02 UIKit`__84-[UIManagedDocument writeContents:toURL:forSaveOperation:originalContentsURL:error:]_block_invoke_0 + 30 frame #4: 0x34155bc0 CoreData`developerSubmittedBlockToNSManagedObjectContextPerform + 88 frame #5: 0x36e3d4b6 libdispatch.dylib`_dispatch_client_callout + 22 frame #6: 0x36e419f6 libdispatch.dylib`_dispatch_barrier_sync_f_invoke + 30 frame #7: 0x34155d42 CoreData`-[NSManagedObjectContext performBlockAndWait:] + 174 frame #8: 0x32054862 UIKit`-[UIManagedDocument writeContents:toURL:forSaveOperation:originalContentsURL:error:] + 986 frame #9: 0x3205418a UIKit`-[UIManagedDocument writeContents:andAttributes:safelyToURL:forSaveOperation:error:] + 698 frame #10: 0x32017ce4 UIKit`__block_global_4 + 68 frame #11: 0x32017c80 UIKit`__block_global_3 + 156 frame #12: 0x339c767c Foundation`-[NSFileCoordinator _invokeAccessor:thenCompletionHandler:] + 144 frame #13: 0x339c791e Foundation`__73-[NSFileCoordinator coordinateWritingItemAtURL:options:error:byAccessor:]_block_invoke_0 + 90 frame #14: 0x339c894e Foundation`-[NSFileCoordinator(NSPrivate) _invokeAccessor:orDont:thenRelinquishAccessClaimForID:] + 202 frame #15: 0x339c926c Foundation`-[NSFileCoordinator(NSPrivate) _coordinateWritingItemAtURL:options:error:byAccessor:] + 548 frame #16: 0x339c78be Foundation`-[NSFileCoordinator coordinateWritingItemAtURL:options:error:byAccessor:] + 90 frame #17: 0x32017254 UIKit`-[UIDocument _coordinateWritingItemAtURL:error:byAccessor:] + 720 frame #18: 0x320179a0 UIKit`__59-[UIDocument saveToURL:forSaveOperation:completionHandler:]_block_invoke_0 + 284 frame #19: 0x36e3e11e libdispatch.dylib`_dispatch_call_block_and_release + 10 frame #20: 0x36e41ece libdispatch.dylib`_dispatch_queue_drain$VARIANT$mp + 142 frame #21: 0x36e41dc0 libdispatch.dylib`_dispatch_queue_invoke$VARIANT$mp + 40 frame #22: 0x36e4291c libdispatch.dylib`_dispatch_root_queue_drain + 184 frame #23: 0x36e42ac0 libdispatch.dylib`_dispatch_worker_thread2 + 84 frame #24: 0x33ba7a10 libsystem_c.dylib`_pthread_wqthread + 360 frame #25: 0x33ba78a4 libsystem_c.dylib`start_wqthread + 8
Check out the link Matt Wilding posted in the comments on his answer!