[IronPython] TypeLoadExceptions

[Jeff Hardy]

Thanks for looking into this, Curt. Best of luck getting it resolved
one way or another :).

-Jeff

On Tue, Jul 8, 2008 at 3:26 PM, Curt Hagenlocher <curt at hagenlocher.org> wrote:
> Actually, the repro inside IronPython is pretty straightforward.  The
> following bit of code will do it:
>
> import array
> class Array2(array.array):
>     __slots__ = ['offset']
>     def __init__(self, typecode, data):
>         self.offset = 0
>
> a = Array2('b', [3, 6, 7, 11])
> I was hoping to repro it from a much smaller C# program though :).
>
> On Tue, Jul 8, 2008 at 11:32 AM, Jeff Hardy <jdhardy at gmail.com> wrote:
>>
>> Hopefully there's a workaround of some kind, because it makes
>> debugging pretty painful. Good luck finding the root cause. I've only
>> been able to hit it in large applications - Django and CherryPy, and
>> haven't been able to find a minimal reproduction.
>>
>> On Mon, Jul 7, 2008 at 5:57 PM, Curt Hagenlocher <curt at hagenlocher.org>
>> wrote:
>> > On Mon, Jul 7, 2008 at 4:46 PM, Jeff Hardy <jdhardy at gmail.com> wrote:
>> >>
>> >> On Sun, Jul 6, 2008 at 6:36 AM, Curt Hagenlocher <curt at hagenlocher.org>
>> >> wrote:
>> >> > Have you gotten this while not running in the debugger?
>> >>
>> >> Hi Curt,
>> >> I've had a chance to try it without the debugger, and I didn't get a
>> >> TypeLoadException. I still get some errors, mind you, but they seem to
>> >> be known issues (namely #15399, which is supposed to be fixed in
>> >> 2.0b4).
>> >>
>> >> Any idea what this means?
>> >
>> >
>> > It strongly suggests that there's a bug in the managed debugger.  It
>> > seems
>> > to be triggered by the use of __slots__.  We generate a backing CLR
>> > class
>> > that's templated for Python classes that contain __slots__, and some of
>> > the methods on the class are themselves templated but with a different
>> > template argument.  You can still debug the code with an unmanaged
>> > debugger
>> > (ie windbg) but it's a significantly less friendly experience.
>> >
>> > I haven't yet gotten around to reporting this to the managed debug
>> > folks, or
>> > creating a smaller test case.
>> >
>> > --
>> > Curt Hagenlocher
>> > curt at hagenlocher.org
>> > _______________________________________________
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>> >
>> >
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