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<p class="MsoNormal">Thank you<o:p></o:p></p>
<p class="MsoNormal">So it does not seem to be relevant for what I’m trying to do.<o:p></o:p></p>
<p class="MsoNormal">I’m doing something unconventional.<o:p></o:p></p>
<p class="MsoNormal">The objective is to implement PGO and code coverage on a system that does not exit and does not have any file io, or any of stdc libraries that libclang-profile is using. (more like a kernel)<o:p></o:p></p>
<p class="MsoNormal">So what I’m trying to do is instead of calling __llvm_profile_write_file () from the application, read the sections __llvm_prf_data, __llvm_prf_names, __llvm_prf_cnts and __llvm_prf_vnds after the critical tasks are done and transfer them
to outside of the system.<o:p></o:p></p>
<p class="MsoNormal">Then dump these sections in a char * array in a c file and attribute them to be in the associated section. Then compile that file with –u__llvm_profile_runtime to create an executable that calls __llvm_profile_write_file to dump my profraw
data.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Sofar, I’m able to do the mechanics but seems like something is going wrong because because fprofile-instr-use does not find profile data for the source files.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Any suggestion?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks<o:p></o:p></p>
<p class="MsoNormal">A<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black"><vsk@apple.com> on behalf of Vedant Kumar <vsk@apple.com><br>
<b>Date: </b>Tuesday, December 19, 2017 at 11:32 AM<br>
<b>To: </b>"Moshtaghi, Alireza" <Alireza.Moshtaghi@netapp.com><br>
<b>Cc: </b>llvm-dev <llvm-dev@lists.llvm.org>, Xinliang David Li <davidxl@google.com><br>
<b>Subject: </b>Re: [llvm-dev] Question about : lprofValueProfNodes<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi,<o:p></o:p></p>
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<p class="MsoNormal"><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 Dec 19, 2017, at 10:26 AM, Moshtaghi, Alireza via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="background:white">Hi<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white">This array is defined in compiler-rt: InstrProfilingValue.c but I can’t find where it is used?<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">It's used in allocateOneNode(). Incrementing the current vnode pointer gives a fresh node (possibly backed by the shared pool).<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="background:white">And the comment on it does not say much about why we need it either.<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">It's used to avoid calling malloc(), which David (CC'd) found to be a performance improvement.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">best,<o:p></o:p></p>
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<p class="MsoNormal">vedant<o:p></o:p></p>
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<p class="MsoNormal" style="background:white">Can someone explain why we need this and where it is used?<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"> <span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white">/* A shared static pool in addition to the vnodes statically<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white">* allocated by the compiler. */<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white">COMPILER_RT_VISIBILITY ValueProfNode<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"> lprofValueProfNodes[INSTR_PROF_VNODE_POOL_SIZE] COMPILER_RT_SECTION(COMPILER_RT_SEG INSTR_PROF_VNODES_SECT_NAME_STR);<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"> <span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white">Thanks<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white">A<span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"> <span style="font-size:12.0pt"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;background:white">_______________________________________________</span><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif"><br>
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