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From George Harley <george.c.har...@googlemail.com>
Subject Re: Contributing SableVM?
Date Wed, 22 Mar 2006 16:15:28 GMT
Etienne Gagnon wrote:
> Hi Harmony developers,
> So, you might have heard of unofficial rumors of potential collaboration
> between the Harmony project and the SableVM project. Here's a message I
> sent lately on the SableVM mailing list:
>  http://sablevm.org/lists/sablevm-devel/2006-March/000608.html
> To summarize the public and private replies I got to this message: the
> prospect of establishing a strong collaboration was met with great
> enthusiasm.
> I did not want to get into official talks with the Harmony project
> before I could make sure that we wouldn't run into license problems.
> So, I started been working hard to get the permission of current and
> past SableVM developers to get their permission to change the license
> and (possibly) execute a software grant.  So, I have tracked down all
> the 27 developers that have contributed code or patches to SableVM, in
> the development trunk or in any other development branch or sandbox.  As
> of this morning, I had received the consent of 18 developers to change
> the license of SableVM.  The following email details the distribution of
> the developers that have not yet replied to my request email (as of
> yesterday evening):
>  http://sablevm.org/lists/sablevm-devel/2006-March/000614.html
> Now that licensing seems not to be an issue anymore, I would like to
> propose a close collaboration between our two projects.  So, let me
> shortly present SableVM.
> SableVM is a project that I started during my Ph.D. studies within the
> Sable research lab at McGill university.  From the beginning, its goal
> was to build a free/open-source virtual machine that could achieve two
> things:
> 1- be usable in the "real world" outside of academia,
> 2- be a research vehicle to within the Java optimization framework of
>    our lab (which includes, among other things, Soot).
> These two objectives are still the guiding our development.  Now, if I
> am right, "1-" is perfectly in line with the objectives of the Harmony
> project.  Furthermore, the Harmony project already accepted the JCVM
> which shares many design features with SableVM (object layout, etc.)
> SableVM has been and is being worked on by many students to develop
> non-trivial components.  Among interesting components:
> - JVMDI & JDWP  -> debugging with Eclipse works
> - user class loaders
> - loading constraints
> - robust verifier
> - generational, partly incremental GC
> - etc.
> Many of these features are not yet integrated in our trunk, as we have
> strict rules on only integrating robust code into our trunk, so that our
> software remains usable by our users.
> What I would like to propose, is to contribute our stable, end-user
> targeted trunk version to the Harmony project.  This would probably
> allow for a merge of the JCVM and SableVM development efforts (and who
> knows, maybe other contributed VMs eventually?), and help provide a more
> complete and robust J2SE environment.
> We would also contribute other modules, either with the initial
> submission, or later when they stabilize.  So, the
> development/collaboration model that I propose would is as follow:
> 1- Day to day development and maintenance of the user targeted VM code
>    happens within the Harmony repository.  SableVM contributors must
>    abide by Harmony rules to contribute to this so-called "SableVM
>    trunk".
> 2- Research and development of trunk-breaking features by SableVM
>    contributors continues within the SableVM repository, as not to
>    pollute the Harmony svn with random code.  Contribution back to the
>    SableVM trunk (within the Harmony svn) must happen under Harmony
>    rules.
> Of course, we are very open to other proposals.  I am quite excited
> about this.  How about you?

Quite excited would be an understatement for me !



> Cheers,
> Etienne

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