<div dir="ltr">Pinging Lang here. I think thi question comes up often enough - maybe needs an FAQ somewhere</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Jan 6, 2020 at 6:02 AM Gaier, Bjoern <<a href="mailto:Bjoern.Gaier@horiba.com">Bjoern.Gaier@horiba.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p class="MsoNormal"><span lang="EN-GB">Is there a code example or maybe a documentation about this subject? Sadly it is an important part of my project to get the addresses of the constructors and destructors.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB">I really ran out of ideas though, every time when I try to look them up, they seem to be gone already .w.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB"><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> David Blaikie <<a href="mailto:dblaikie@gmail.com" target="_blank">dblaikie@gmail.com</a>>
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<b>Sent:</b> 19 December 2019 20:52<br>
<b>To:</b> Gaier, Bjoern <<a href="mailto:Bjoern.Gaier@horiba.com" target="_blank">Bjoern.Gaier@horiba.com</a>>; Lang Hames <<a href="mailto:lhames@gmail.com" target="_blank">lhames@gmail.com</a>><br>
<b>Cc:</b> <a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a><br>
<b>Subject:</b> Re: [llvm-dev] Moving to ORCv2 - Where are my global constructors and destructors?<u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><a href="mailto:lhames@gmail.com" target="_blank">+Lang Hames</a> owner/author of the ORC JIT (though I think he's out of office at the moment, so replies from him might be delayed).<br>
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I believe there's a way to wire up the global ctors, but I don't know the details unfortunately - perhaps someone else will chime in if/before Lang gets a chance.<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">On Thu, Dec 19, 2019 at 5:53 AM Gaier, Bjoern via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<u></u><u></u></p>
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<p class="MsoNormal"><span lang="EN-GB">Heyho,</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB">Recently I tried out the ORCv2 JIT, especially the LLJIT. I gotta say, that I really like the new interface and the way you use it! However there is one thing
I’m missing. I wrote a small bit code file, which should force having a global constructor.</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:blue">int</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black"> wuff();</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:blue">__declspec</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">(</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:blue">noinline</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">)
</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:blue">int</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black"> miau()</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">{</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black"> printf(</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:rgb(163,21,21)">"Huhuhu"</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">);</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:blue">return</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black"> wuff();</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">}</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:blue">const</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:blue">int</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black"> x = miau();</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB">When I parse this IR file in my JIT and go through the ‘globals()’ of the llvm::Module, then I will encounter a symbol with the following name:</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB">“_GLOBAL__sub_I_VectorBIOS.cpp” where VectorBIOS.cpp was the name of the source file I compiled to the bit code.</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB">I then wanted to get the address of that symbol - from the MCJIT times I remember, that those functions are the global constructors, but when calling lookup on
that name, I was not able to find the symbol.</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB">So I tried a different way:</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">llvm::</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:rgb(43,145,175)">GlobalVariable</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">
*var = </span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:gray">module</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:teal">-></span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">getNamedGlobal(</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:rgb(163,21,21)">"llvm.global_ctors"</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">);</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:blue">if</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">(var)</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">{</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black"> llvm::</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:rgb(43,145,175)">ConstantArray</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">
*InitList = (llvm::</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:rgb(43,145,175)">ConstantArray</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">*)var->getInitializer();</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:blue">for</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">(</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:blue">unsigned</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:blue">int</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black"> n = 0; n < InitList->getNumOperands(); n++)</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black"> {</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black"> llvm::</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:rgb(43,145,175)">ConstantStruct</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">
*CS = (llvm::</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:rgb(43,145,175)">ConstantStruct</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">*)InitList->getOperand(n);</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:blue">if</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">(!CS)</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black"> {</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:blue">continue</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">;</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black"> }</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black"> llvm::</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:rgb(43,145,175)">Constant</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">
*FP = CS->getOperand(1);</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:blue">if</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">(FP->isNullValue())</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:blue">continue</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">;</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black"> llvm::</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:rgb(43,145,175)">ConstantExpr</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">
*CE = (llvm::</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:rgb(43,145,175)">ConstantExpr</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">*)FP;</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:blue">if</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">(CE->isCast())</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black"> {</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black"> FP = CE->getOperand(0);</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black"> }</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black"> ((llvm::</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:rgb(43,145,175)">Function</span><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">*)FP)->getName();</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black"> }</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:9.5pt;font-family:Consolas;color:black">}</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB">I then printed the name of the llvm::Function but it was exactly the name I expected “_GLOBAL__sub_I_VectorBIOS.cpp”. This code was executed before I added module
to the JIT. </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB">For various reasons I wanted to store the address to the constructor – so I don’t want to call the LLJIT runConstructor – simply because I want to execute those
functions later, when the LLJIT does not exist anymore.</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB">I hope someone can help me with this…</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB">Kind Greetings</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB">Björn</span><u></u><u></u></p>
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