Note that I do get printouts. Unfortunately, I also get an attempt to popup a GUI alert, which fails horribly if I'm debugging -gui... so I try to figure out what could have gone wrong based on the call stack -- which is not helpful in your case (NSInvocation).
On Fri, Aug 2, 2013 at 4:36 PM, Riccardo Mottola
<riccardo.mottola@libero.it> wrote:
Hi,
I have a hard time analyzing certain runtime exceptions in GNUstep. For example, if you send a message to a non-existing method under Cocoa, you get an NSLog, not so on GS, at least, not always. I am speaking of a Gui app.
Right now, I don't have a "cocoa" counterpart of the Application I'm trying to debug, so...
I know I get an exception, because I noticed the app misbehaving, thus I put a breakpoi8nt in [NSException raise] and rightfully it stops:
Breakpoint 2, 0xb6f7fd50 in -[NSException raise] (self=0xa409f28,
_cmd=0xb72521c0) at NSException.m:1056
1056 id info = (_reserved == 0) ? nil : _e_info;
trace:
(gdb) bt
#0 0xb6f7fd50 in -[NSException raise] (self=0xa409f28, _cmd=0xb72521c0)
at NSException.m:1056
#1 0xb6f7f2c9 in +[NSException raise:format:arguments:] (self=0xb7252260,
_cmd=0xb72521a8, name=0xb7252294, format=0xb726d4c0,
argList=0xbfe8b310 "ÿ÷\"·Ó\017\017·Ê\207&·Ìçý¶\221²è¿\233²è¿Ê\207&·ð\001ø¶\020;C\n\220j*·xj*·") at NSException.m:1056
#2 0xb6f80245 in +[NSException raise:format:] (self=0xb7252260,
_cmd=0xb726d280, name=0xb7252294, format=0xb726d4c0) at NSException.m:1056
#3 0xb6fdd69c in -[NSObject doesNotRecognizeSelector:] (self=0xa416c00,
_cmd=0xb726d370, aSelector=0xb7268d10) at NSObject.m:1425
#4 0xb6fdbb69 in -[NSObject forwardInvocation:] (self=0xa416c00,
_cmd=0xb72a6ab0, anInvocation=0xa433b10) at NSObject.m:1765
#5 0x0a416c00 in ?? ()
#6 0xb726d370 in _OBJC_SELECTOR_TABLE ()
from /System/Library/Libraries/libgnustep-base.so.1.24
#7 0xb7268d10 in _OBJC_SELECTOR_TABLE ()
from /System/Library/Libraries/libgnustep-base.so.1.24
#8 0xb6f9f246 in -[NSInvocation setTarget:] (self=0x5c891cec,
_cmd=0xdfe81024, anObject=0x81ffece8) at GSPrivate.h:101
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
this gives me no real clue about where this is coming from and what is the missing selector and where it is trying to access it. I guess it is a wrong selector because of "doesNotRecognizeSelector".
I tried getting up to stack #3 and print out the selector, which is a (SEL). How may I print it out?
However, the next step is why I get no output.
I put a breakpoint in _NSAppKitUncaughtExceptionHandler() of NSApplication. That exception will either re-raise it through base if there is no graphic context or put a nice Panel. In theory. I don't get into that method, this means the exception is sort trapped elsewhere or not thrown in a way that ends up here!
Ideas?
Riccardo
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