>From jleuner Fri Mar 22 19:21:31 2002
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Date: Fri, 22 Mar 2002 19:20:12 +0000
From: John Leuner <[EMAIL PROTECTED]>
Subject: JRVM + GNU Classpath
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I have written a description containing the twenty steps needed to compile and run
JRVM 2.02 with GNU Classpath:
http://people.debian.org/~jewel/jikes/STEPS
And associated files:
http://people.debian.org/~jewel/jikes/jikes-cp.tar.gz
http://people.debian.org/~jewel/jikes/jbuild.linkImage.patch
There is more work to be done on this. I should break the JRVM diffs down into
two patches. There are changes there that should be included in the JRVM source,
perhaps with a conditional which can be specified in the relevant rvm/config/<file>.
I have to update this to work with the latest code in Classpath CVS, as well as with
JRVM 2.03.
This is still pretty much untested, I would like to have a look at the regression
tests and mauve later.
John Leuner
On Thu, Mar 21, 2002 at 10:50:40AM -0500, Julian Dolby wrote:
>
> Some objects are created during boot image writing, and are subsequently
> used when Jikes RVM is running; the opt. compiler has several such data
> structures. These objects must be allocated at boot image writing time by
> the JDK and written into the boot image to be read by RVM. This requires
> that the format of the object created by the JDK (i.e. fields, static data)
> be somewhat similar to that expected at runtime by Jikes RVM.
>
> Since the libraries we currently use are not based on Sun code, this is
> not the case for several of the java.util classes. The purpose of libyuck
> is to force the boot image writer to use the java.util classes Jikes RVM
> expects rather than those it normally uses. It does this by putting
> libyuck at the front of the bootstrap class path of the JDK. This is
> fragile because the JDK seems to have some built in assumptions about some
> java.util classes, but it works for the set of classes in there now.
>
> I would expect that the CLASSPATH libraries will have similar issues.
> You will likely need to put some set of CLASSPATH classes into libyuck.jar
> to force the JDK to use them when writing boot image objects.
>
> You should probably start by not putting anything into libyuck.jar, and
> see where problems arise during boot image writing. For classes that
> cannot be written into the boot image correctly, try putting them into
> libyuck.
>
> -- Julian
>
>
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