sablevm-developer

[Sablevm-developer] RE: Game-Plan

[Brent F. <bre...@xp...>]

> Once you're familiar with the JNI, you can help me by first 
> cleaning up the SablePath native code.  I might also need some
> help implementing some core classes, unless I have time to 
> implement them first.
> 
> How does that sounds?  Is it OK for you?
>

Sounds good.  I am somewhat familiar with JNI, but have not used
it recently.  I found a good summary on the web (see
http://www.mindspring.com/~david.dagon/jni/Native.txt), but
I don't know if it is fully up-to-date.

I could only find a copy of the Jdk1.1 version of the JNI
interface (in PDF/PS format) from Sun.  I was going to use this
(since it seems pretty well-written), but I'm not sure if it's
too out of date.  I see the Jdk 1.2 had some enhancements, but
they aren't worked into the spec.

Also, Per Bothner (we talked to him earlier this week) has
a write-up (http://sources.redhat.com/java/papers/native++.html)
that he did.

[Sablevm-developer] Re: Game-Plan

[Etienne M. G. <eg...@j-...>]

Hi Brent.

Brent Fulgham wrote:
> 
> 
> Sounds good.  I am somewhat familiar with JNI, but have not used
> it recently.  I found a good summary on the web (see
> http://www.mindspring.com/~david.dagon/jni/Native.txt), but
> I don't know if it is fully up-to-date.


The JNI book has the most up-to-date information.  The online
documentation is somewhat outdated, but more importantly, the book has 3
main parts:
I- Introduction and tutorial
II- Programmer's guide
III- Specification

Part II is very well written, and worth reading.  I do not remember
seeing its equivalent online.  The book list price is US$39.95.  It's
probably worth the investment, as it is the definitive reference.  (The
book explains Local Ref frames, and all kind of subtle JNI concepts, and
how to apply them in your native code).

Etienne
-- 
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Etienne M. Gagnon, M.Sc.                     e-mail: eg...@j-...
Author of SableVM:                             http://www.sablevm.org/
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Re: [Sablevm-developer] RE: Game-Plan

[Etienne M. G. <eg...@j-...>]

Hi Again.

Brent Fulgham wrote:
> Also, Per Bothner (we talked to him earlier this week) has
> a write-up (http://sources.redhat.com/java/papers/native++.html)
> that he did.

Hmmm... This document seems as an early draft for CNI.  I would
personally be inclined to stick to C for native code.  JNI overhead is
bad enough, adding to that C++ overhead might no be ideal for key Java
library methods.  But I know that some Classpath developer would prefer
using C++/CNI (where CNI would be implemented as a JNI wrapper).

Etienne
-- 
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Etienne M. Gagnon, M.Sc.                     e-mail: eg...@j-...
Author of SableVM:                             http://www.sablevm.org/
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