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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi Nipun,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I’m afraid I don’t know the state of LLVM’s alias analysis.
Hopefully someone more knowledgeable on the list can inform you.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Cheers,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>James<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> Nipun Arora [mailto:nipun2512@gmail.com] <br>
<b>Sent:</b> 26 January 2012 16:31<br>
<b>To:</b> James Molloy<br>
<b>Cc:</b> LLVM Developers Mailing List<br>
<b>Subject:</b> Re: [LLVMdev] Compiling glibc with LLVM<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hi James,<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>I will look into the RedHat newlib library, however, we def
are looking for a solution for glibc, but maybe newlib would be a good way to
go to test our complete workflow before putting an effort to generate control
flow graphs for glibc.<o:p></o:p></p>
</div>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>btw. I did have another question, hopefully you would be
able to answer, what we are looking to do is to get the control flow graph
including some sort of alias analysis for function pointers. I see that there
are already existing analysis passes in LLVM to get the control flow, however
do you know how function pointer can be handled? <o:p></o:p></p>
</div>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>Thanks<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>On Thu, Jan 26, 2012 at 11:06 AM, James Molloy <<a
href="mailto:james.molloy@arm.com">james.molloy@arm.com</a>> wrote:<o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi
Nipun,</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>As
you say, glibc is rather GCC –oriented. I certainly haven’t tried this myself,
but have you thought of using an alternate C library such as RedHat newlib?
That can certainly be compiled by clang (we do it every night).</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Cheers,</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><br>
James</span><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> <a
href="mailto:llvmdev-bounces@cs.uiuc.edu" target="_blank">llvmdev-bounces@cs.uiuc.edu</a>
[mailto:<a href="mailto:llvmdev-bounces@cs.uiuc.edu" target="_blank">llvmdev-bounces@cs.uiuc.edu</a>]
<b>On Behalf Of </b>Nipun Arora<br>
<b>Sent:</b> 26 January 2012 15:54<br>
<b>To:</b> LLVM Developers Mailing List<br>
<b>Subject:</b> [LLVMdev] Compiling glibc with LLVM</span><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
line-height:12.75pt;background:white'><span style='font-size:10.0pt;font-family:
"Helvetica","sans-serif"'>Hi,</span><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
line-height:12.75pt;background:white'><span style='font-size:10.0pt;font-family:
"Helvetica","sans-serif"'> </span><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
line-height:12.75pt;background:white'><span style='font-size:10.0pt;font-family:
"Helvetica","sans-serif"'>I read on the gentoo website <a
href="http://en.gentoo-wiki.com/wiki/Llvm" target="_blank"><span
style='text-decoration:none'>http://en.gentoo-wiki.com/wiki/Llvm</span></a> that
glibc cannot be compiled using llvm because of some GNU extensions which LLVM
does not support.</span><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
line-height:12.75pt;background:white'><span style='font-size:10.0pt;font-family:
"Helvetica","sans-serif"'> </span><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
line-height:12.75pt;background:white'><span style='font-size:10.0pt;font-family:
"Helvetica","sans-serif"'>Has there been any success in compiling glibc using
LLVM so as to get the bytecode?</span><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
line-height:12.75pt;background:white'><span style='font-size:10.0pt;font-family:
"Helvetica","sans-serif"'>We are looking to do whole program analysis to look
at control flows including those in libc... we were hoping that we could get
the control flows using LLVM API's for glibc.</span><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
line-height:12.75pt;background:white'><span style='font-size:10.0pt;font-family:
"Helvetica","sans-serif"'> </span><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
line-height:12.75pt;background:white'><span style='font-size:10.0pt;font-family:
"Helvetica","sans-serif"'>Has anyone tried this before?</span><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
line-height:12.75pt;background:white'><span style='font-size:10.0pt;font-family:
"Helvetica","sans-serif"'> </span><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
line-height:12.75pt;background:white'><span style='font-size:10.0pt;font-family:
"Helvetica","sans-serif"'>Thanks</span><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
line-height:12.75pt;background:white'><span style='font-size:10.0pt;font-family:
"Helvetica","sans-serif";color:#666666'>Nipun</span><o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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