Language extensions ?

Fri Mar 28 05:33:00 GMT 2003

> > Of course suggestions about alternative ways of achieving my aims
> > gladly accepted !
>> Will http://www.rtj.org/doc/javax/realtime/RawMemoryAccess.html do what you need?
>> Andrew.

I guess it could do some of it, but JMTk would require extensive changes which I don't want to have to make. I guess the whole heap would have to be allocated as a set of RawMemoryAccess objects. I'm still left with the problem of unsigned integer comparison.
Sadly, the only way to compare signed integers in an unsigned way is:
boolean GT(int a, int b) {
 if( a > 0 && b > 0 || a < 0 && b < 0 ) 
 return a > b;
 else
 return a < b;
}
and doing this twice per pointer store operation (in a write barrier) would be expensive.
I suppose an alternative extension would be an "unsigned comparison" method that was guaranteed to be inlined.
-- Robin
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