Reini Urban wrote:
Hi,
I'm trying to convert JVM classfiles to run under parrot.
I do not try interpret or jit the bytecode, I just read the classfiles,
convert it offline to our internal representation and compile this then
to our optimized bytecode/jit/executable which is register based.
So I don't need to verify and interpret the class files, just read it.
A colleague already did that for .NET, so JVM is no big deal.
The problem I have is that I'd like to use some parts of your
sourcecode, just the classreader and some headers with the basic
structs, and I want to ask if it's possible to release that under the
Artistic license 2.0 for this project.
Otherwise I would have to rewrite it from scratch, because parrot does
not accept the GPL or LGPL alone.
No big deal, writing the op specs into our format from the vmspec is
most of the work, but it would help a bit. Pasting the structs from the
vmspec html or pdf is too stupid, and there's a tiny bit of logic also
involved.
My work where I would need it:
http://svn.perl.org/parrot/branches/cygwin070patches/languages/jvm/pmc/JavaClassFile.pmc
http://svn.perl.org/parrot/branches/cygwin070patches/languages/jvm/pmc/structures.h
The License:
http://svn.perl.org/parrot/trunk/LICENSE
The files:
readClass.c readClass.h
and the sources for readInterfaces, readFields, readMethods and
readAttributes and such.
Those are Copyright (c) 1996, 1997, 1998, 1999
Transvirtual Technologies, Inc. All rights reserved.
As reference J.Worthington's Dissertation Paper on net2pbc
http://www.jnthn.net/papers/2006-cam-net2pir-dissertation.pdf
We can convert about 70% of the .NET mscorlib.dll and the other System
libs, for JVM I believe we should reach 80%, because the JVM is a bit
simplier than .NET.
perl6 and all the other parrot langs can use then compiled Java and .NET
libs.
It sounds like a very interesting project.
Unfortunately, the Kaffe.org project does not hold the copyright for
that code, so we wouldn't be able to relicense it.
Transvirtual shut down in 2002. At that time, the investors took
control of all of Transvirtual's Intellectual Property. Of course, we
can still use the code, as it was released under the GPL license.
Twin Communications of America took control of the assets in 2003
(according to their website), and they still seem to be around:
http://www.twincom.net/
Perhaps you can ask them if they'd be OK with relicensing?
Cheers,
- Jim
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