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echo: muffin
to: Bob Jones
from: Wes Garland
date: 2003-06-29 11:31:34
subject: MEX VM issues

BJ> I know I've seen it reported that the MEX virtual 
 BJ> machine was broken.  I think I've now updated to 
 BJ> the version of Maximus directly out of the source 
 BJ> forge site (plus the files in max-3.03-etc.tar.gz), 
 BJ> but I'm not sure....

 BJ> Is there currently someone working on the MEX VM?  

 BJ> What has already been tried concerning the MEX VM?
 
I'm looking at the MEX VM on-and-off -- it's been frustrating me.
 
The only changes which ave made it into the CVS versions of max is a
modification of the grammar so that it will compile correctly under real
yacc (as opposed to GNU bison). 
 
The problem is that for some reason, MEX is dereferencing pointers to
unallocated memory when its trying to pull stuff from its heap. I originall
through the problem was that Scott was coercing pointers into 32 bit
scalars and back, but I have since tested under a 32-bit platform (sparc)
and it still blows up.
 
Bascially, it's understand-the-code-then-hit-the-debugger time.
 
Wes

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