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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>There’s actually a bunch of issues tangled together here
but you’re right, changing that statement would make the frames more
usable… There’s actually some thoughts that our dynamic stack
trace support should be pulled up entirely into IronPython and that might just
happen.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The other issues are just related to how we generally produce
frames. For example if you do:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>try:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> raise
ZeroDivisionError<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>except:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> #
start extracting frames from sys.exc_info()<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>In CPython you get a bunch of frames from above the except block
and in IronPython you get no frames. Turns out the inspect module does
this and the latest Django in source control relies on that working </span><span
style='font-size:11.0pt;font-family:Wingdings;color:#1F497D'>J</span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>.
<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>So to fix that bug requires that we always take a full stack
trace when we get the frames. And that of course kills exception handling
perf in a quite significant way (it gets 3x more expensive to throw an
exception, and it’s already really expensive). So we should
bring this back w/o having the –D flag enabled, and we might also want to
change how we track frames in general to do something better and more
consistent w/ CPython. But we can’t push that down into the DLR so there’s
a non-trivial amount of work here.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
users-bounces@lists.ironpython.com [mailto:users-bounces@lists.ironpython.com] <b>On
Behalf Of </b>Curt Hagenlocher<br>
<b>Sent:</b> Monday, March 31, 2008 9:20 AM<br>
<b>To:</b> Discussion of IronPython<br>
<b>Subject:</b> Re: [IronPython] Semi-blocking bug in IP 2B1<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal>LambdaCompiler.Statements.cs basically says "if
(Options.DebugMode && Options.DynamicStackTraceSupport)
EmitGetCurrentLine()". Maybe this should be "or" instead
of "and"?<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>On Mon, Mar 31, 2008 at 9:13 AM, Dino Viehland <<a
href="mailto:dinov@exchange.microsoft.com">dinov@exchange.microsoft.com</a>>
wrote:<o:p></o:p></p>
<p class=MsoNormal>It's actually something that's on our radar - it feels worse
to me too. It's something I plan on taking a look at before 2.0 final
ships.<o:p></o:p></p>
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<p class=MsoNormal><br>
-----Original Message-----<br>
From: <a href="mailto:users-bounces@lists.ironpython.com">users-bounces@lists.ironpython.com</a>
[mailto:<a href="mailto:users-bounces@lists.ironpython.com">users-bounces@lists.ironpython.com</a>]
On Behalf Of Michael Foord<br>
Sent: Monday, March 31, 2008 9:04 AM<br>
To: Discussion of IronPython<br>
Subject: Re: [IronPython] Semi-blocking bug in IP 2B1<br>
<br>
Curt Hagenlocher wrote:<br>
> On Mon, Mar 31, 2008 at 8:10 AM, Michael Foord<br>
> <<a href="mailto:michael.foord@resolversystems.com">michael.foord@resolversystems.com</a>>
wrote:<br>
><br>
>> In general, error reporting/tracebacks seem to be much worse in<br>
>> IronPython 2. If I have time I will try and produce a repro...<br>
>><br>
><br>
> If you run with a -D flag, you get much better error reporting. This<br>
> is equivalent to setting (ScriptRuntime).GlobalOptions.DebugMode =<br>
> true in a hosting scenario.<br>
><br>
> (Thanks to Jimmy Schementi's post on the IronRuby list for pointing me at
this.)<br>
><br>
<br>
Ok - and thanks. But we generate and execute code at runtime and need<br>
good error reporting for our users. If there is a performance<br>
implication we wouldn't want to have to set this flag just to be able to<br>
give our users useful tracebacks! The IP traceback handling is generally<br>
fine for us - but I haven't *confirmed* that IP 2 is worse - it just<br>
feels worse...<br>
<br>
We have bigger problems anyway. Now I have ironed out the obvious<br>
problems, Resolver One runs on IP 2 but the user interface is completely<br>
broken. That is all pure-Python code so I have some digging to do... :-)<br>
<br>
Michael<br>
<br>
<br>
<br>
> --<br>
> Curt Hagenlocher<br>
> <a href="mailto:curt@hagenlocher.org">curt@hagenlocher.org</a><br>
> _______________________________________________<br>
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