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Mac Forum / Programming / Mac Programming / December 2005Inspecting ObjC objects in GDB?
How can I inspect an objective c object in GDB if the code I'm tracing doesn't have debugger symbols? For instance, I've got QuickTime Player loaded in GDB, and at one point I stop just before a call that passes an NSDictionary to another constructor. Because its objc, I know that 'self' is in r3, the selector in r4, and thus the NSDictionary is in r5. How can I see what's in that NSDictionary? Something like (gdb) print-object $r5 NSDictionary only shows me the name of the class: "NSDictionary". I also tried (gdb) call (NSString *)[$r5 description] $1 = (class NSString *) 0x3af550 (gdb) po $1 NSDictionary This appears to call the method and store the result in GDB memory. But still it only shows me the name "NSDictionary". I guess maybe I need to cast $r5 but I can't figure out the syntax. Any pointers? |\/| /| |2 |< mehaase(at)gmail(dot)com > How can I inspect an objective c object in GDB if the code I'm tracing > doesn't have debugger symbols? [quoted text clipped - 18 lines] > still it only shows me the name "NSDictionary". I guess maybe I need to > cast $r5 but I can't figure out the syntax. It's showing you this because you have a pointer to the NSDictionary class in r5. I don't know why it would be doing this, but that's what I can determine from seeing this. Classes print out their name for their description. NSDictionary instances should print their contents. You can verify this by comparing the value of $r5 with the value of [$r5 class]. If they're the same, then it's a class for sure. If they're different, it's an instance.  SignatureMichael Ash Rogue Amoeba Software > How can I inspect an objective c object in GDB if the code I'm tracing > doesn't have debugger symbols? [quoted text clipped - 20 lines] > > Any pointers? This usually happens because $r5 contains the NSDictionary class itself, not an instance of NSDictionary. If you want to confirm this, compare the value of [$5 class] to $r5 itself. Is $r5 is a class, the values will match. -Peter SignaturePull out a splinter to reply. |
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