[Dpcl-user] dpcl patch in 64 bit mode

[Harald S. <ha...@ce...>]

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Hello,

  some time ago we received a patch from Dave Wootton to  change the default
type of a parameter if the probe module was not compiled with -g. ( I attach the
mail with his answer ).

  Since then, we must provide this patch to our users who want to run 64bit
applications with our DPCL tracing facility because we really need this change.
So, is there any chance to put this patch in your repository and be the default
behaviour in the future releases?

Thank you,

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Subject:
Re: [Dpcl-user] MPI routine call parameters on a 64-bit MPI application
From:
"Dave Wootton" <dwo...@us...>
Date:
Mon, 13 Jan 2003 11:14:23 -0500
To:
Jordi Caubet Serrabou <jo...@ce...>


Yes, the problem is easily reproduced. The root cause of the problem is that
when a probe module is compiled without the -g option, we have to assume default
types for parameters to the functions in the probe module, and we had been
defaulting to integer data type. In 64 bit mode, sizeof(int) is 4 bytes and
sizeof(void *) is 8 bytes, so we were truncating the pointer, resulting in the
sigsegv. The source file I am attaching to this email gets around the immediate
problem by changing the default parameter type to pointer, which will have the
correct size in 32 and 64 bit mode.

This is based off the latest (v325) level code in our cvs repository. If you are
using a different level, you may need to reconcile the code. The module goes in
the src/dyninstAPI/src/os/aix directory.

The ultimate solution needs more work, as we need to worry about checking data
types when probe modules are compiled with -g, and also need to look closer at
the default parameter type and when it should be integer or pointer.

Also note that if you compile the probe module with -g now, you will have type
mismatch errors when installing and activating probes. That's part of what needs
to be addressed by the final fix.


Dave

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   o//o Harald Servat Gelabert (harald at cepba dot upc dot edu)
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