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Date: Wed, 03 May 2006 16:15:26 +0100
From: Tim Ellison <t.p.ellison@gmail.com>
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To: harmony-dev@incubator.apache.org
Subject: Re: DRLVM contribution - try this out!
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Good work Andrey and everyone in the MPD (getting the Intel lingo ;-) )

I appreciate just how much work is involved in making such a large
contribution into the project -- you guys are stars!

Go Harmony!


Regards
Tim

Andrey Chernyshev wrote:
> Dear All,
> 
> I'm happy to announce the contribution of the DRL Virtual Machine on
> behalf of
> Intel.
> I have described in the bottom of this message how you can try it for
> yourself.
> 
> The code is a result of efforts of Intel Middleware Products Division
> team. The
> archive with the contribution is uploaded to the following location:
> 
> http://issues.apache.org/jira/browse/HARMONY-438
> 
> The issue contains two zip archives:
> 
>    DRLVM_src_20060502_1806_Harmony.zip
>        - The DRLVM source code contribution, containing the following
> components:
> VM (or VM core)
> GC
> JIT
> Bytecode verifier
> Kernel classes
> OS layer
> 
>    DRLVM_src_20060502_1806_Patches_for_Harmony.zip
>        - A few patches that should be applied to Harmony class libraries
>     in order to integrate them with DRLVM.
> 
> We checked that the JRE combined from the DRLVM and the Harmony class
> libraries
> is capable of running Eclipse and Ant. It was tested with Harmony
> classes taken
> at 03/13 (plus some contributions existed to that date, such as
> HARMONY-39 and
> HARMONY-88) on Windows and Linux IA32.
> 
> The building system included with the DRLVM is entirely written on Ant
> and is
> capable of producing a workable JRE combined from DRLVM and Harmony
> class libraries (we have intentionally included the compilation of class
> libraries code into the DRLVM building system to give an example how the
> native
> code for the complex multi-component project can be built with Ant).
> Both VM and
> Class Libraries can be built with MSVC or Intel C compiler on Windows
> and gcc or
> Intel C compiler on Linux IA32. Eclipse 3.1.1 compiler is used for
> compiling the
> Java code.
> 
> DRLVM communicates with the Harmony class libraries through the set of
> kernel
> classes and VMI interface, as described in the Harmony Class Library
> Porting
> Documentation. We had to add the java.lang.SringBuffer into the kernel
> classes
> set for now since it is tighten to the java.lang.String in our
> implementation.
> 
> The DRLVM is not yet a complete full-functional product, there is a
> plenty of
> things to do such as 1.5 support or missing some of JVMTI/JNI capabilities.
> Please refer to the README.txt and Developers Guide (located in the 'doc'
> directory) provided with the contribution. However, we hope that the
> existing VM
> implementation, in conjunction with the Harmony class libraries and
> Eclipse, at
> least should be able to provide the self-hosting environment where
> developers
> can edit, compile and run Java code using Eclipse, execute Ant (you can try
> to rebuild the DRLVM and Harmony class libraries by executing it's Ant
> building
> system on top of the previously built DRLVM image).
> 
> IMPORTANT NOTE: the building system, by default, downloads all the
> necessary
> software and libraries such as Eclipse, APR, LogCXX or zlib directly
> from the
> Internet, BY RUNNING THE DRLVM BUILD YOU ARE ACCEPTING THE LICENSE TERMS
> for the
> software and libraries used for the DRLVM compilation and linking.
> Please refer
> to the README.txt provided with the contribution for more detailed
> information
> how to build DRLVM and which software/libraries are used for that.
> 
> 
> HOW TO TRY IT:
> 
> To build the DRLVM, just extract the both zip archives into the same
> directory,
> set ANT_HOME and JAVA_HOME, run the "build update" and then "build". See
> the
> README.txt for more details, including the software required (you'll
> need some
> JRE, C/C++ compiler, Ant and Svn tool to checkout classlibs).
> 
> Note that the DRLVM may not work with the most recent version of Harmony
> class
> libraries since the latter is constantly changing (the last version of
> classes
> we were adopting the DRLVM for was taken at 03/13). Some work will still be
> needed to integrate it with the most recent version of the class libraries.
> 
> You are welcome to try it and share your opinion!
> 
> Thank you,
> Andrey Chernyshev
> Intel Middleware Products Division
> 
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> 

-- 

Tim Ellison (t.p.ellison@gmail.com)
IBM Java technology centre, UK.

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