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From David Tanzer <stru...@guglhupf.net>
Subject This week on harmony-dev (Sept. 11 - Sept. 17 2005)
Date Sat, 17 Sep 2005 14:36:50 GMT
Tim Ellison and I were discussing about the component model to use in
harmony in the thread "[arch] VMCore / Component Model". The component
model should be some mechanism to load components, resolve dependencies
between the components and provide some versioning mechanisms for the
components and their interfaces to ensure forward/backward
compatibility. I have posted a proof-of-concept implementation to the
wiki which uses shared libraries and tables of function pointers to
provide this functionality.

Rana Dasgupta clarified some points about VM accessors in "[arch] 
VM/Classlibrary Interface ( VM Accessors )". He defines them as a VM
access toolkit which could be used by the class library or JVMTI agents.
He started to define an initial set of candidates for standardization.
He also mentioned that restricting access to these classes might result
in better performance of these accessors.

In the thread "[Arch] Class unloading and VM objects reclaim", Robin 
Garner explained how this is done in JikesRVM with MMTk: "where the 
classloader allocates its objects is essentially configurable". He then
explains more details about how this is done. Peter Edworthy replied to
this explaining where he thought OS could be used to assign seperate
memory areas to the parts of the VM and then do acces checks at the OS
level. In the same thread, Tim Ellison replied to Archie Cobbs that he
agrees that "All identical string literals must refer to the same
instance" and that a pure Java implementation of String.intern() would
be acceptable.

Chris Elford started the thread "[Arch] Designing in support for JVMTI 
in Harmony" where he explains what he expects from harmony's
implementation of the JVMTI specification. Weldon Washburn has posted
two interfaces between the VM and the GC in the thread "[arch] Modular
JVM component diagram" and the wiki.

Last week Mark Wielaard suggested to exdend "This week an harmony-dev"
to also cover some of the other mailinglists of the sister projects, so
I started reading some other mailing lists. It's really interesting what
goes on in these projects, but it is quite a lot of traffic and I don't
think I can give a valualbe summary in this series. These discussions
can't be summarized in a single paragraph per sister project, and
everything more would be too much for this series.

Maybe a solution would be that these projects try to find somebody
who summarizes their discussions (if they want it), and all these
summaries are then aggregated at http://planet.classpath.org so
we have a single point where we can find them. I hope you understand
that I don't do this, I really enjoy writing these summaries for Harmony
but it would be too much work for me to write about several other
projects too.

Regards, David.

-- Read the archive of this series at http://deltalabs.at/
-- RSS feed: http://deltalabs.at/?q=taxonomy/term/8/0/feed
-- Also aggregated at: http://planet.classpath.org/

David Tanzer, Haghofstr. 29, A-3352 St. Peter/Au, Austria/Europe
http://deltalabs.at -- http://dev.guglhupf.net -- http://guglhupf.net
My PGP Public Key: http://guglhupf.net/david/david.asc
Pinky, Are You Pondering What I'm Pondering?
I think so Brain, but how do we get a pair of Abe Vegoda's pants?

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