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From Archie Cobbs <arc...@dellroad.org>
Subject Re: [jchevm] Porting JCHEVM to OSX/PPC
Date Tue, 29 Nov 2005 22:34:17 GMT
David Tanzer wrote:
> The good news first: it compiles now. The problem I described in the
> previous mail was that libjc was linked with the option "-module" (so
> it can be dlopen()ed) and this is not portable. I removed the -module
> and now it compiles.
> I stripped out lots of ELF specific stuff, so my version could be 
> interesting for a port to windows too. I just don't want to commit it
> to "trunk" yet because it's completely untested.

You could create a branch to play with in Subversion. If you do,
I recommend also using svnmerge... http://dellroad.org/svnmerge

> @Archie Cobbs: Is the "-module" really important for libjc? If yes we'd
> have to find a portable solution for this...

JC dlopen()s itself in order to access core native code for java.lang,
etc. This code in turn accesses core VM functions. It's possible to avoid
this; e.g., you could add a special hack in JC's native linker along with
a static (and redundant) array of available native functions. This would
be easy to do but imposes a maintenance burden because this list must
be kept up to date with the functions defined in libjc/native/*.c.

> To make it compile I left the funtion "_jc_dynamic_invoke(...)" in the
> file "libjc/arc/ppc/arch_functions.c" empty, but this function is needed
> to run JCHEVM (it calls C functions and is needed for JNI AFAICS). Maybe
> somebody with more PPC experience can help me with porting this function
> from i386.

That function essentially does the same thing as libffi (but slightly
differently of course :-) You might look at libffi's implementation.


Archie Cobbs      *        CTO, Awarix        *      http://www.awarix.com

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