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<div>In an Arm training class, I requested a DDT feature from John Linford from Arm Inc, which now owns Allinea DDT. Basically, I want DDT to correctly display petsc variable-lengthed arrays and void* pointers. From John's feedback, it looks DDT could support
it. </div>
<div>Does anyone already have custom pretty-printers in gdb for petsc? Otherwise, I think we should make one and perhaps let Arm ship with its product.</div>
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<div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature">
<div dir="ltr">--Junchao Zhang</div>
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<div dir="ltr" class="gmail_attr">---------- Forwarded message ---------<br>
From: <strong class="gmail_sendername" dir="auto">John Linford</strong> <span dir="ltr">
<<a href="mailto:John.Linford@arm.com">John.Linford@arm.com</a>></span><br>
Date: Tue, Mar 5, 2019 at 1:16 PM<br>
Subject: Re: Arm DDT feature questions<br>
To: Zhang, Junchao <<a href="mailto:jczhang@mcs.anl.gov">jczhang@mcs.anl.gov</a>><br>
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<p style="margin-top:0;margin-bottom:0">Hi Junchao,</p>
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<p style="margin-top:0;margin-bottom:0">The Forge developers came back with some answers. Please see below. Thanks,</p>
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Sorry for the delay. Please find answer to your questions:</p>
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<i>Does Arm DDT support user-defined array length and user-defined pointer casting from a custom file, which sets the rules and is provided by users? </i><i></i></p>
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Yes, DDT does support this through the user of GDB pretty printers. The best example is the support of STL vectors in DDT. There is also a simple example in /path/to/forge/example/fruit* and explanations in the UG.</p>
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I have been trying to fiddle with pretty printers and PETSC (this could make a nice blog article) but I only managed to make it work in GDB, not in DDT for some reason. I’ll let you know if I manage to get anything interesting.</p>
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We could possibly make a feature request to support PETSC datatypes. If PETSC developers maintain GDB pretty printers between versions, I think this is something we could look at.</p>
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<div id="m_-6852634584907103811divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> John Linford<br>
<b>Sent:</b> Tuesday, February 19, 2019 12:31:56 PM<br>
<b>To:</b> Zhang, Junchao<br>
<b>Subject:</b> Re: Arm DDT feature questions</font>
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<p style="margin-top:0;margin-bottom:0">Hi Junchao,</p>
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<p style="margin-top:0;margin-bottom:0">Thanks for the follow-up and glad you could attend the workshop. I've sent this over to the tools group and should have an answer for you soon. Thanks,</p>
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<div id="m_-6852634584907103811x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Zhang, Junchao <<a href="mailto:jczhang@mcs.anl.gov" target="_blank">jczhang@mcs.anl.gov</a>><br>
<b>Sent:</b> Friday, February 15, 2019 5:28:59 PM<br>
<b>To:</b> John Linford<br>
<b>Subject:</b> Arm DDT feature questions</font>
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<div dir="ltr">Hi, John,
<div> Does Arm DDT support user-defined array length and user-defined pointer casting from a custom file, which sets the rules and is provided by users? Suppose I have a struct</div>
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<div>typedef struct {</div>
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<div> int type;</div>
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<div> int len;</div>
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<div> double *p;</div>
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<div> void *data; </div>
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<div>} Vec;</div>
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<div>Currently, to display a Vec variable, I have to manually tell DDT length of array p[] is given by len, and type of void *data is Vec_MPI* if type==1, is Vec_Seq* if type==2, so on so forth. I have to do the manual work every time when I display variables
of type Vec. It is not convenient. </div>
<div>Structures with void pointers is heavily used by PETSc, which is a numerical library widely used in HPC. It would be nice if DDT supports PETSc objects display natively.<br>
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<div>Thank you <br>
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<div dir="ltr" class="m_-6852634584907103811x_x_gmail_signature">
<div dir="ltr">--Junchao Zhang</div>
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