Purify on Guile

Purify on Guile

[yluo]

Dear Experts,

We use memory-debugging tools (Purify) here, and it is annoying to get 
Error/Warning messages every time. There are many SBR and UMR warnings 
during garbage collection and some SBW (Stack array bounds write) errors 
reported during dynamic throw. I guess those operations on memory are 
harmless, but which always makes people nervous. Is there any way to 
avoid those happened? If so, could you please kindly point me the way?

Really appreciate for your help!!

Best Regards,
Pavane



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Re: Purify on Guile

[Matthias Koeppe]

yluo <pavane.luo@synopsys.COM> writes:

> We use memory-debugging tools (Purify) here, and it is annoying to get
> Error/Warning messages every time. There are many SBR and UMR warnings
> during garbage collection and some SBW (Stack array bounds write)
> errors reported during dynamic throw. I guess those operations on
> memory are harmless, but which always makes people nervous. 

Guile's conservative garbage collector scans memory regions for valid
pointers.  It may hit uninitialized memory cells during the scan.
This is normal.  

I have not seen warnings about SBW, though.  (I use Purify on
SPARC/Solaris.)  They are probably due to the stack unwinding that is
done at a throw.

> Is there any way to avoid those happened? If so, could you please
> kindly point me the way?

Simply suppress these warnings.  Here are three suppressions from my
.purify file.

       suppress umr scm_ceval
       suppress umr scm_mark_locations
       suppress sbr scm_mark_locations

-- 
Matthias Koeppe -- http://www.math.uni-magdeburg.de/~mkoeppe


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