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From "Nick Lothian" <nloth...@educationau.edu.au>
Subject RE: [arch] VM Candidate : JikesRVM http://jikesrvm.sourceforge.net/
Date Fri, 20 May 2005 05:00:34 GMT
> > JCVM has a nice feature in this area in that it converts 
> bytecode to C 
> > and then lets GCC compile that. That would appear to make it very 
> > portable, but it isn't the way most VMs work. (Ironicaly, the C 
> > genetation code in JC VM is written in Java - see 
> > 
> http://cvs.sourceforge.net/viewcvs.py/jcvm/jcvm/java/org/dellroad/jc/c
> > ge
> > n/)
> Hmmm, interesting... I wonder if we could hook directly into 
> the compiler intermediate representation instead of having to 
> write a big string using C syntax and fire a parser on it.
> Does anybody know if GCC allows such a thing?

The JCVM docs talks about possible support for generating ELF binaries
usign just Java code, although this doesn't appear complete at this
point. See

GCC also has its own internal format (called RTL I think). I don't know
much (anything) about that, but it is easy to speculate about producing
RTL from bytecode and feeding it to the compiler. I'd speculate that GCJ
works something like this.

> Keep in mind I know squad about GCC and friends.

Me neither.


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