From: Rocky Bernstein <rockyb@...>
Date: 2010-12-14T21:10:55+09:00
Subject: [ruby-core:33716] Re: Towards a standardized AST for Ruby code

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On Tue, Dec 14, 2010 at 3:58 AM, Charles Oliver Nutter
<headius@headius.com>wrote:

> On Sun, Dec 12, 2010 at 6:34 PM, Rocky Bernstein <rockyb@rubyforge.org>
> wrote:
> > On  the other hand, I do believe that in the rubinius implementation it
> is
> > possible to have one interpreter/system which suits both competing needs
> of
> > performance and live introspection. I believe this because in a sense
> > rubinius *is* already two implementations: a Ruby interpreter plus a JIT
> for
> > it.
>
> JRuby has also been a mixed-mode implementation since early 2008.
> Depending on what information you want available for debugging, it's
> possible to provide it in interpreted mode; but as we discussed at
> RubyKaigi, all optimizing compilers will eventually want to throw away
> information about code that isn't necessary for execution, and then
> you have to do debugging only with the interpreter (or with a compiler
> that doesn't do those optimizations, which may be fine). I don't think
> you currently want/need anything we throw away, but we need to be
> mindful of that possibility.
>
> - Charlie
>

Thanks for the information. Yes I suspect it does, but I need to check and
get back to you. it's on my list of things to do.

And thanks for your mindfulness.

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<br><br><div class=3D"gmail_quote">On Tue, Dec 14, 2010 at 3:58 AM, Charles=
 Oliver Nutter <span dir=3D"ltr">&lt;<a href=3D"mailto:headius@headius.com"=
>headius@headius.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_qu=
ote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex=
;">
<div class=3D"im">On Sun, Dec 12, 2010 at 6:34 PM, Rocky Bernstein &lt;<a h=
ref=3D"mailto:rockyb@rubyforge.org">rockyb@rubyforge.org</a>&gt; wrote:<br>
&gt; On =A0the other hand, I do believe that in the rubinius implementation=
 it is<br>
&gt; possible to have one interpreter/system which suits both competing nee=
ds of<br>
&gt; performance and live introspection. I believe this because in a sense<=
br>
&gt; rubinius *is* already two implementations: a Ruby interpreter plus a J=
IT for<br>
&gt; it.<br>
<br>
</div>JRuby has also been a mixed-mode implementation since early 2008.<br>
Depending on what information you want available for debugging, it&#39;s<br=
>
possible to provide it in interpreted mode; but as we discussed at<br>
RubyKaigi, all optimizing compilers will eventually want to throw away<br>
information about code that isn&#39;t necessary for execution, and then<br>
you have to do debugging only with the interpreter (or with a compiler<br>
that doesn&#39;t do those optimizations, which may be fine). I don&#39;t th=
ink<br>
you currently want/need anything we throw away, but we need to be<br>
mindful of that possibility.<br>
<br>
- Charlie<br></blockquote><div><br></div><div>Thanks for the information. Y=
es I suspect it does, but I need to check and get back to you. it&#39;s on =
my list of things to do.=A0</div><div><br></div><div>And thanks for your mi=
ndfulness. =A0</div>
</div><br>

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