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Re^3: Capturing stack trace in eval

by Joost (Canon)
on Oct 07, 2009 at 21:31 UTC ( #799824=note: print w/replies, xml ) Need Help??

in reply to Re^2: Capturing stack trace in eval
in thread Capturing stack trace in eval

Actually, I might have been mistaken about my SIG{__DIE__} assertion - I mean that using __DIE__ instead of overriding CORE::GLOBAL::die might indeed be the best way of dealing with it.

As I said I don't have the code with me at the moment - last time I looked at that specific bit of code was a couple of months ago and I switched implementations a few times.

In any case, the end result turned out that throwing an exception object that encapsulates the stack trace from whatever means you use to intercept the error was the only reasonable way of dealing with the problem when you also have to deal with eval (both versions).

Update: the way I implemented it, was that the exception object overloaded stringification so that the stack trace is printed if the exception isn't eventually caught.

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[Lady_Aleena]: Corion, ouchy.
[Corion]: (maybe I should write this up as a SoPW) - currently, the "most efficient" data structure I come up with is a single array which I scan for the first fitting one-shot. Not efficient but I don't expect more than five outstanding one-shots anyway
[choroba]: can't you create a meta-key corresponding to the disjunction of the events?
[robby_dobby]: Corion: Heh. This whole thing smells of Strategy Pattern or MVC pattern.
[Corion]: And performance linear to the number of registered one-shots doesn't feel that bad. Maybe I should collect statistics on how many callbacks are outstanding ;)
[Corion]: choroba: Yes, but the longer I thought about efficient hashes mapping the event type back to their callbacks, and how to keep them in sync, the more I thought that all that optimization might just not be worth it, even if it's horribly inelegant
[Lady_Aleena]: My biggest problem with hashes at the moment is one with 2,501 keys.
[choroba]: how many event types are there?
[Corion]: Also I found that I can't conveniently weaken an array slot, which also is inconvenient, as I want my one-shots to disappear if the caller discards them
[Corion]: choroba: Currently two or three that my program handles (WWW::Mechanize:: Chrome), but there might be more that become interesting

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