Re: [rvm-research] Curious about OpenJDK on JikesRVM

Hi all,

Here is the patch to allow us to replace fields and methods of the
class when generating the bootimage.

https://jira.codehaus.org/browse/RVM-1065

With the help of this patch, we could support OpenJDK without copying
any file from OpenJDK repository.

Regards.

On 16 August 2013 17:45, Erik Brangs <[email protected]> wrote:
> Hi,
>
> On 15.08.2013 20:58, Xi Yang wrote:
>> I would like to drop all classes who should be included in JDK
>> libraries, and as Maxine does, replace some methods and fields.
>> However, I am not sure this is a good idea for GNU Classpath.
>> Classpath may already assume any VM implementation would replace those
>> classes in "libraryInterface/Common"?
>
> AFAIK the Classpath implementations of things like java.lang.Class just
> defer to the corresponding stub class (i.e. VMClass in this case) so we
> could just write the appropriate classes if we wanted to. I suppose that
> there'll be a detailed discussion on this when the OpenJDK support is
> ready for mainline so we don't have to worry about it for now.
>
>> Beside the interface, I think there are two points Jikes did not do it
>> very well. One is the list of JDK classes in bootimage, another is the
>> the list of classes who should be inited in certain order before
>> dynamic loading becoming functional. I think this is a good chance to
>> fix them all. Instead of trying many times, and add classes in the
>> list manually, we can have a script to figure out candidates. We can
>> put why we need to init class X, and the dependence between class
>> X,Y,Z  for JDK libraries.
>
> That would indeed be very useful. It would certainly reduce the time
> needed to port to new versions of the class libraries. That being said,
> I have not looked at this problem at all so I don't know how difficult
> it is.
>
> The only thing I can say from memory is that you would likely need to
> define a comprehensive set of test programs to run on each image to
> ensure that all features work. For example, you will need to check that
> the -Xbootclasspath options work (see e.g.
> http://jira.codehaus.org/browse/RVM-887 for an issue relating to that).
>
>
> Kind regards,
>
> Erik Brangs
>
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