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From Davanum Srinivas <dava...@gmail.com>
Subject Re: Other interesting papers and research
Date Mon, 06 Jun 2005 16:27:30 GMT
Found a paper from David too...
http://www.research.ibm.com/people/d/dgrove/papers/cgo05.html

On 6/6/05, shudo@computer.org <shudo@computer.org> wrote:
> Hi Rob,
> 
> > From: Robert Lougher <rob.lougher@gmail.com>
> > Date: Mon, 6 Jun 2005 14:58:45 +0100
> 
> > > > One thing to
> > > > note is that a threaded interpreter would see something like a 2-4x
> > > > expansion over "normal" bytecodes when it converts from bytecodes to its
> > > > internal form (arrays of function pointers).
> > >
> > > Direct threading interpreters like JDK's one work on plain Java
> > > bytecode and they do not need to expand normal bytecode instructions.
> > > Such expansion may have been required if Java bytecode is not linear
> > > and rather a tree or other complicated form.
> >
> > According to my understanding, an indirect threaded interpreter uses
> > the original bytecode stream.  It's indirect because the handler
> > address must be looked up via the bytecode.
> 
> Ah, thanks for the indication.
> My wording 'direct threading' was not correct.
> 
> Threading (interpreting) techniques I referred as implemented in JDKs
> should be called 'token threading', neither direct nor indirect threading
> because they work directly on bytecode instructions withought any expansion.
> Note that the interpreter provides NEXT routines to for all native
> code fragments corresponding to VM instructions.
> For JVM, this wording like something threading is not very informative
> because direct interpretation of portable bytecode is naturally
> 'token threading'.
> 
> Dave's last posting was based on direct threading technique and his saying
> was correct about direct threading but my posting was incorrect in advance.
> 
>   Kazuyuki Shudo        shudo@computer.org      http://www.shudo.net/
> 


-- 
Davanum Srinivas - http://webservices.apache.org/~dims/

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