Hello Mark,
Hi,
On Sun, 2003-08-10 at 15:32, Peter Werno wrote:
we are developing a new Virtual Machine for Amiga OS
(http://sourceforge.net/projects/jamiga) which will be bundled with
the GNU classpath.
Nice. Hope you find GNU Classpath useful for bringing a VM to that
platform.
Yes, indeed. We tried with Sun's rt.jar first, but their documentation
...uhm... well ...
plus they were never answering any of our requests (e.g. wether or not we
could include the rt.jar with our vm). Once we moved to GNU classpath, it
took us only 2-3 days to replace everything and it now runs much
smoother :-)
Our VM is following a differnet approach and JNI has not been
implemented yet. Moreover, we tend to implement a lot of the core
functions/classes natively straight into the VM, as the older
68K-processors of the Amiga-Systems are not really up to speed with
modern Intel or IBM-chips!
In principle GNU Classpath can be used by VMs that don't support JNI.
But JNI makes things a lot easier since for almost everything we supply
native JNI C based implementations. But we also try to setup everything
so that classes don't need explicit native methods. In principle every
class that needs native or VM support (or a particular system/VM
optimization) delegates to a package private final VMSomething class
that is VM dependent and that does the correct thing on that VM (so if
the VM supports JNI then in most cases it can use the default
vm/reference classes that use the supplied native JNI implementations.
But this support is not complete yet so we need developers of VMs that
don't support JNI to help us point out where we need to abstract away
from direct native methods. Welcome! You have just volunteered :)
I will help wherever I can :-)
From the top of my head ... there is this TimeZone - class in the
java.util - package which defines a getDefaultTimeZoneId - method. Would
it make sense to redirect this to - say - the java.lang.VMSystem - class?
(The currentTimeMillis is defined in System too, so it's not too far off
:-) )
For this reason, it would be very useful, if we could get information
on changes, especially where native method calls are involved.
Would this kind of information usually be broadcasted on this mailing
list, or are there different channels that I should subscribe to?
There are two mailinglist: http://savannah.gnu.org/mail/?group=classpath
[EMAIL PROTECTED] and [EMAIL PROTECTED] The first one (this
mailinglist) is were all the technical discussion takes place, also
discussion related to VM interface changes (which should always be
listed in the NEWS file).
If you want to follow development closely then you also need to
subscribe to the second mailinglist which gets email whenever code in
CVS changes or the bug or patch tracker record changes.
Cheers,
Mark
I will check that out! Thank you very much,
Peter Werno
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