From: "Florian Groß" <florgro@...>
Date: 2006-03-05T04:20:09+09:00
Subject: Re: Review requested: Binding.call_stack(), Binding.of_caller()-style

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Dumaiu wrote:

>   I'd like to submit for evaluation an elaboration I've made on the
> famous 'Binding.of_caller()' of Florian Gro�.  I have tried to follow
> the the description of the interface for Binding.call_stack() suggested
> in ruby-talk 12097, "RCR: replacing 'caller'", although in standard
> Ruby instead of an extension.
>   The technique of using set_trace_func() to capture a Binding one
> stack frame up has been around at least since 2001 [1].  Here I raise
> an exception and ride it out to main scope, catching Bindings as the
> stack unrolls.  File and line info is taken from caller() as usual, and
> the input from the two traces is knitted together.

Wow, that's some pretty innovative, clever and great thinking going on 
there. I haven't even thought about doing this, yet. Nice idea.

However, I see a problem with it: If you throw() through methods that 
have an ensure block the ensure block will get executed. This is 
demonstrated in the attached example. (I also attached your code because 
it was damaged in your mail by being wrapped.)

I thought we might be able to fly through ensure blocks without 
executing them by raising the fatal exception, but it appears that Ruby 
will even run them in that case...

If you can find a way of making it work correctly with the attached test 
then you have an implementation that is a lot more powerful than mine 
which means I can finally drop my implementation... :)

> I would appreciate your input with regard to the following:
>   * The three class attributes mentioned above (and the version member)
> allow noninvasive tweaking, but I'm not sure whether I should be using
> class variables or class instance vars for them.

I'd just hard code the actual classes instead. I see no purpose in being 
able to change the type of data it returns anyway. If you need to 
convert it to another format, you can always just do that.

>   * I noticed that Herr Gro� renders his script thread critical().  I
> know not enough about thread safety to incorporate this without dumbly
> parroting him.

The trace func isn't thread local, but you want it to be. The only way 
of working around that is by temporarily stopping all other threads.

>   * Use of set_trace_func() breaks compatibility with the debugger, and
> I haven't had much luck with irb, either.  Under what other
> circumstances do Binding.of_caller() and relatives not work well?

When there already is a trace_func. :)

It's also a problem when using -rtrace. Binding.of_caller ought to work 
in IRB, but I'm not 100% sure.

> Finally: I've only been in Ruby for a little over a month, so if it
> looks somewhere like I don't know what I'm doing, that's probably the
> case. :-)

And you are sure you really want to get involved into this kind of black 
magic already? :)

Well, it already seems to be paying off so who am I to ask? :)

-- 
http://flgr.0x42.net/

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