Hi folks. I've done a load of googling after getting SIG(variable) errors
when adding and removing objects to/from an arrayController in pyobjc and can't seem
to figure this one out. I've tried the pyobjc list and have no response so far.
Apologies for cross-posting and please let me know if I'm asking the question poorly, vaguely,
or on the wrong mailing list.
I set Signals.dumpStackOnFatalSignal() as well as
Debugging.installVerboseExceptionHandler () and then I start adding python
(subclassing NSObject) objects to my NSArrayController. After a variable
number of additions and/or subtractions, I get the stack trace below. (there
are no other errors, including those related to KVC compliance, etc)
Intuition is telling me that I may be in trouble because I'm instantiating
python singleton objects (subclassing the class directly below) as
attributes of the object that I'm adding to the NSArrayController, but I
could be way off here.
*Update: I removed all singletons from my code and have the same behavior.
*Update: this happens whether or not I have the objects delete on removal from the
controller.
class scAbstractSingleton(object):
def __new__(cls, *args, **kwds):
it = cls.__dict__.get("__it__")
if it is not None: return it
cls.__it__ = it = object.__new__(cls)
it.init(*args, **kwds)
return it
def init(self, *args, **kwds):
pass
Is there a way post-mortem to get the object that *was* at 0x114d740 in the
trace below? Is there a way to recursively enumerate all attributes of a
given object to do a print(theAttribute) on instantiation? That could be
crazy... Any cool pdb tricks I should know?
I assume that figuring out which object (0x114d740 in the trace below) was
freed is a good place to start, but I don't know if that's possible in
retrospect, as that object is freed. I can see the memory referenced in
gdb, but I don't see anything that would help...at least not to my
inexperienced eyes. Who knows the proper voodoo?
Thanks in advance to the cocoa/pythonistas!
Cheers,
Jonathan Saggau
2006-03-27 21:10: 28.897 Trigger[436] *** ObjC exception
'NSUncaughtRuntimeErrorException' (reason: 'objc: FREED(id): message retain
sent to freed object=0x114d740') discarded
Stack trace (most recent call last):
__dyld_start (in dyld)
0x00002414 (in Trigger)
0x00003e50 (in Trigger)
0x00003db0 (in Trigger)
_PyRun_SimpleFileExFlags (in Python)
_PyRun_FileExFlags (in Python)
_PyEval_EvalCode (in Python)
_PyEval_EvalCodeEx (in Python)
_PyEval_EvalCode (in Python)
_PyEval_GetFuncDesc (in Python)
_PyEval_GetFuncDesc (in Python)
_PyEval_EvalCodeEx (in Python)
_PyEval_EvalCode (in Python)
_PyEval_GetFuncDesc (in Python)
__PyUnicodeUCS2_IsAlpha (in Python)
_PyRun_FileExFlags (in Python)
_PyEval_EvalCode (in Python)
_PyEval_EvalCodeEx (in Python)
_PyEval_EvalCode (in Python)
_PyEval_GetFuncDesc (in Python)
_PyEval_GetFuncDesc (in Python)
_PyEval_EvalCodeEx (in Python)
_PyEval_EvalCode (in Python)
_PyEval_GetFuncDesc (in Python)
_objc_NSApplicationMain (in _AppKit.so) (_AppKit.m:129)
_NSApplicationMain (in AppKit)
-[NSApplication run] (in AppKit)
-[NSApplication sendEvent:] (in AppKit)
-[NSWindow sendEvent:] (in AppKit)
-[NSControl mouseDown:] (in AppKit)
-[NSButtonCell trackMouse:inRect:ofView:untilMouseUp:] (in AppKit)
-[NSCell trackMouse:inRect:ofView:untilMouseUp:] (in AppKit)
-[NSCell _sendActionFrom:] (in AppKit)
-[NSControl sendAction:to:] (in AppKit)
-[NSApplication sendAction:to:from:] (in AppKit)
_ffi_closure_ASM (in _objc.so) (darwin_closure.S:95)
_ffi_closure_helper_DARWIN (in _objc.so) (ffi_darwin.c:703)
_method_stub (in _objc.so) (libffi_support.m:479)
_PyObject_Call (in Python)
_pysel_call (in _objc.so) (selector.m:941)
_PyObject_Call (in Python)
_PyFunction_SetClosure (in Python)
_PyEval_EvalCodeEx (in Python)
_PyEval_EvalCode (in Python)
_PyEval_GetFuncDesc (in Python)
_PyEval_GetFuncDesc (in Python)
_PyObject_Call (in Python)
_objcsel_call (in _objc.so) (selector.m:517)
_PyObjCFFI_Caller (in _objc.so) (libffi_support.m:1300)
_ffi_call (in _objc.so) (ffi_darwin.c:404)
_ffi_call_DARWIN (in _objc.so) (darwin.S:121)
-[NSArrayController _insertObject:atArrangedObjectIndex:objectHandler:]
(in AppKit)
-[NSArrayController didChangeValuesForArrangedKeys:objectKeys:indexKeys:]
(in AppKit)
-[NSController _notifyObserversForKeyPath:change:] (in AppKit)
-[NSObject(NSKeyValueObservingPrivate) _notifyObserversForKeyPath:change:]
(in Foundation)
-[NSSelectionBinder observeValueForKeyPath:ofObject:change:context:] (in
AppKit)
-[NSValueBinder _observeValueForKeyPath:ofObject:context:] (in AppKit)
-[NSSelectionBinder
_adjustObject:mode:observedController:observedKeyPath:context:editableState:adjustState:]
(in AppKit)
-[_NSModelObservingTracker
setIndexReferenceModelObjectArray:clearAllModelObjectObserving:] (in AppKit)
___objc_error (in libobjc.A.dylib)
2006-03-27 21:10:28.899 Trigger[436] objc: FREED(id): message retain sent to
freed object=0x114d740
--
The extent to which an individual can resist being blindly led by tradition is a good measure of his vitality. - Harry Partch
There is a computer disease that anybody who works with computers knows about. It's a very serious disease and it interferes completely with the work. The trouble with computers is that you 'play' with them! - Richard P. Feynman
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