[pypy-dev] JVM backend - status and future work possibilities?

[Bo Chen]

Hi, all,

I'm a newbie in python and python implementation.
I just read this thread. It's no better to me to devote some effort on the
JVM backend in pypy. That could be a little hard for me but cool. And I need
to write my master's doc the next year too! It's a good opportunity for me
to study on the details of a language implementation.

Shall we just do something or help each other?

Thanks & BR
Bo Chen

On Thu, May 12, 2011 at 12:39 PM, Charles Oliver Nutter <headius at headius.com
> wrote:

> FWIW I would be happy to help out with advice and direction, especially if
> the JVM backend could be rejiggered to take advantage of the new
> invokedynamic bytecode in Java 7. I have been using it for JRuby and have
> been very pleased with it.
>
> Anyway, I really hope the JVM backend can move forward and I am standing by
> to help out as I am able.
>
> - Charlie (mobile)
>
> On May 11, 2011, at 16:56, Dario Bertini <berdario at gmail.com> wrote:
>
> > 2011/5/11 Michał Bendowski <michal at bendowski.pl>:
> >> Welcome everyone :)
> >>
> >> I was wondering what is the current status of the JVM backend. I'm
> >> asking because I am considering working on it for my master's thesis -
> >> I was inspired by a call to action from the "Features" page of
> >> pypy.org. Unfortunately it's unclear to me how much work needs to be
> >> done here. I understand that RPython translation is already
> >> implemented (although might need some care, for the build process to
> >> succeed more easily[1]), but the JIT backend is missing. There is also
> >> no integration with JVM libraries - am I right? On the other hand
> >> there already is a "reference" CLI implementation and a whole thesis
> >> about it.
> >
> > Hi, I'm in a similar situation here :)
> >
> > I'm planning as well to work on the jvm backend for my master thesis:
> > I contacted just today one of my professors who seems to be willing to
> > mentor me, but I haven't started any work yet
> >
> > the integration with JVM libraries basically is a prerequisite for
> > starting the work on the JIT backend, I'm not sure and I don't
> > actually know your university program, but here at my university for
> > the master thesis we have something like 15 ects... so something like
> > the integration with the JVM alone may very well be on the upper side
> > of what effort we could be expect to put in the thesis
> >
> > You're right about the CLI implementation, but after a huge
> > refactoring inside pypy it wasn't functional anymore... Antonio Cuni
> > (who is the author of the CLI backend we're talking about) fixed it,
> > but I think that the ability to access CLI assemblies and class still
> > has some issues...
> >
> > btw, I'm very new to this project as well, and from what I gathered
> > until now, Antonio seems to be the guy to ask to for questions about
> > the OO type system :)
> >
> > As a starting point: he suggested me to start looking into JPype and
> Jtool
> >
> > http://jpype.sourceforge.net/
> >
> http://blog.meresco.org/2010/03/11/integrating-java-in-python-with-jtool/
> >
> > this kind of tools are needed for calling JVM code from CPython, thus
> > letting us to try/debug the JVM integration when running pypy
> > interpreted on top of CPython ( pypy/bin/py.py )
> >
> >>
> >> I'm not familiar with pypy internals at the moment, nor am I a
> >> compiler expert (yet!). I will be very grateful for any advice, as to
> >> whether taking care of the JVM backend is a suitable amount of work,
> >> and whether it can "scale", i.e. be divided into smaller parts that I
> >> can implement along the way and stop if I'm out of time (I imagine I
> >> can always find more work in PyPy).
> >>
> >
> > I would also like to know if this kind of work would be feasible to
> > tackle in parallel for 2 students like us :)
> >
> > (btw, my presence on the irc channel has been quite lacking
> > nowadays... I'll try to be more present in the next days)
> >
> > byebye
> >
> > :Dario
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