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<p class="MsoNormal"><span style="color:#1F497D">Thank a lot Martin. I will give a try.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Have a good weekend,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Jin<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Martin J. O'Riordan [mailto:martin.oriordan@movidius.com]
<br>
<b>Sent:</b> Friday, October 14, 2016 11:52 AM<br>
<b>To:</b> Lin, Jin <jin.lin@intel.com><br>
<b>Cc:</b> 'LLVM Developers' <llvm-dev@lists.llvm.org><br>
<b>Subject:</b> RE: [llvm-dev] creating an .init section<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-IE" style="font-size:12.0pt;font-family:"Book Antiqua",serif;color:#943634">I don’t use ‘</span><span lang="EN-IE" style="font-size:12.0pt;font-family:"Courier New";color:black">.init</span><span lang="EN-IE" style="font-size:12.0pt;font-family:"Book Antiqua",serif;color:#943634">’,
but I do use ‘</span><span lang="EN-IE" style="font-size:12.0pt;font-family:"Courier New";color:black">.ctors</span><span lang="EN-IE" style="font-size:12.0pt;font-family:"Book Antiqua",serif;color:#943634">’ and ‘</span><span lang="EN-IE" style="font-size:12.0pt;font-family:"Courier New";color:black">.dtors</span><span lang="EN-IE" style="font-size:12.0pt;font-family:"Book Antiqua",serif;color:#943634">’
for our target. This is implemented in ‘</span><span lang="EN-IE" style="font-size:12.0pt;font-family:"Courier New";color:black"><<i>Target</i>>TargetObjectFile.cpp</span><span lang="EN-IE" style="font-size:12.0pt;font-family:"Book Antiqua",serif;color:#943634">’,
in my case as follows:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-IE" style="font-size:12.0pt;font-family:"Book Antiqua",serif;color:#943634"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-IE" style="font-size:10.0pt;font-family:"Courier New";color:black">MCSection *SHAVETargetObjectFile::getStaticCtorSection(unsigned Priority,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-IE" style="font-size:10.0pt;font-family:"Courier New";color:black"> const MCSymbol * /* KeySym */) const {<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-IE" style="font-size:10.0pt;font-family:"Courier New";color:black"> std::string ctorsSectionName;<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-IE" style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-IE" style="font-size:10.0pt;font-family:"Courier New";color:black"> if (Priority == 65535u)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-IE" style="font-size:10.0pt;font-family:"Courier New";color:black"> ctorsSectionName = ".ctors";<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-IE" style="font-size:10.0pt;font-family:"Courier New";color:black"> else<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-IE" style="font-size:10.0pt;font-family:"Courier New";color:black"> ctorsSectionName = std::string(".ctors.") + utostr(65535u - Priority);<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-IE" style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-IE" style="font-size:10.0pt;font-family:"Courier New";color:black"> return getSHAVESection(ctorsSectionName, DATA);<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-IE" style="font-size:10.0pt;font-family:"Courier New";color:black">}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-IE" style="font-size:12.0pt;font-family:"Book Antiqua",serif;color:#943634"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-IE" style="font-size:12.0pt;font-family:"Book Antiqua",serif;color:#943634">and in ‘</span><span lang="EN-IE" style="font-size:12.0pt;font-family:"Courier New";color:black">SelectSectionForGlobal</span><span lang="EN-IE" style="font-size:12.0pt;font-family:"Book Antiqua",serif;color:#943634">’
in the same file, I have:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-IE" style="font-size:12.0pt;font-family:"Book Antiqua",serif;color:#943634"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-IE" style="font-size:10.0pt;font-family:"Courier New";color:black"> if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(GV1)) {<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-IE" style="font-size:10.0pt;font-family:"Courier New";color:black"> const StringRef gvName = GV->getName();<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-IE" style="font-size:10.0pt;font-family:"Courier New";color:black"> bool isLLVMSpecial = StringSwitch<bool>(gvName)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-IE" style="font-size:10.0pt;font-family:"Courier New";color:black"> .Case("llvm.used", true)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-IE" style="font-size:10.0pt;font-family:"Courier New";color:black"> .Case("llvm.metadata", true)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-IE" style="font-size:10.0pt;font-family:"Courier New";color:black"> .Case("llvm.global_ctors", true)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-IE" style="font-size:10.0pt;font-family:"Courier New";color:black"> .Case("llvm.global_dtors", true)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-IE" style="font-size:10.0pt;font-family:"Courier New";color:black"> .Default(false);<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-IE" style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-IE" style="font-size:10.0pt;font-family:"Courier New";color:black"> if (isLLVMSpecial) {<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-IE" style="font-size:10.0pt;font-family:"Courier New";color:black"> if (gvName == "llvm.global_ctors")<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-IE" style="font-size:10.0pt;font-family:"Courier New";color:black"> return getStaticCtorSection();<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-IE" style="font-size:12.0pt;font-family:"Book Antiqua",serif;color:#943634"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-IE" style="font-size:12.0pt;font-family:"Book Antiqua",serif;color:#943634">Then use ‘</span><span lang="EN-IE" style="font-size:12.0pt;font-family:"Courier New";color:black">__attribute__((constructor))</span><span lang="EN-IE" style="font-size:12.0pt;font-family:"Book Antiqua",serif;color:#943634">’
on the function definition you want to run in the initialisation phase.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-IE" style="font-size:12.0pt;font-family:"Book Antiqua",serif;color:#943634"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-IE" style="font-size:12.0pt;font-family:"Book Antiqua",serif;color:#943634"> MartinO<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-IE" style="font-size:12.0pt;font-family:"Book Antiqua",serif;color:#943634"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> llvm-dev [<a href="mailto:llvm-dev-bounces@lists.llvm.org">mailto:llvm-dev-bounces@lists.llvm.org</a>]
<b>On Behalf Of </b>Lin, Jin via llvm-dev<br>
<b>Sent:</b> 14 October 2016 19:10<br>
<b>To:</b> <a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a><br>
<b>Subject:</b> [llvm-dev] creating an .init section<o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-IE"><o:p> </o:p></span></p>
<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I would like to create an .init section in the LLVM backend. Can anyone shed me the light on how to do it? Do I have to create it in the clang?<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"><o:p> </o:p></p>
<p class="MsoNormal">Jin<o:p></o:p></p>
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