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Re: Java on uClinux
Bernd Schmidt writes:
> Andrew Haley wrote:
> > Bernd Schmidt writes:
> > > David Daney wrote:
> > > > Perhaps not in general, but one unstated premise of this whole thread is
> > > > that for some GCC targets (most Unix like operating systems) you *can*
> > > > count on a SIGSEGV when you dereference a null pointer. The java front
> > > > end takes advantage of this fact to eliminate explicit checks for
> > > > dereferencing of null pointers.
> > >
> > > Oh.
> > >
> > > Speaking of which, has anyone ported gcj to a MMU-less uClinux platform yet?
> >
> > It's impossible with the current config. This is because some of
> > libgcj is written on C++, and the C++ compiler FE does not insert
> > checks for null pointer accesses. I wrote a small patch to do this
> > but it was rejected.
>
> Hmm, we can trap null pointer accesses, but I don't think we deliver
> reliable SIGSEGV signals yet or provide a means of getting the faulting
> address. If that was fixed, is there anything obvious that stands in
> the way of a uClinux/uClibc port?
I don't think so. The only other dependency we have is POSIX threads.
Andrew.