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<p class="MsoNormal"><span style="color:windowtext">Heyho,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">I can only provide you with a screenshot for the first problem I noticed:<br>
<img width="693" height="470" style="width:7.2187in;height:4.8958in" id="Picture_x0020_1" src="cid:image001.png@01D50573.89F0B850" alt="https://media.discordapp.net/attachments/534012750045642783/575369402195640321/unknown.png"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">This code will crash when calling “eeBuilder.create”.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">But I also looked at what happens if I do reuse the llvm::ExecutionEngine. After the call to “finalizeObject” I use “removeModule” for the Module I used.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">If I know parse the same module again and pass it to that llvm::ExecutionEngine, it will notice the duplication and rename the symbols, like when it does when you add the same module two times.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">If I add a different module everything behaves as before – so overall it seems like you can’t reuse a llvm::ExecutionEngine…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="color:windowtext">From:</span></b><span style="color:windowtext"> llvm-dev <llvm-dev-bounces@lists.llvm.org>
<b>On Behalf Of </b>preejackie via llvm-dev<br>
<b>Sent:</b> Dienstag, 7. Mai 2019 15:28<br>
<b>To:</b> llvm-dev@lists.llvm.org<br>
<b>Subject:</b> Re: [llvm-dev] Reuse llvm::ExecutionEngine<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p><span style="font-family:"Courier New"">Hi Bjoern,</span><o:p></o:p></p>
<p><span style="font-family:"Courier New"">Could you please give me a minimal code sample to produce this behavior?</span><o:p></o:p></p>
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<p class="MsoNormal">On 07/05/19 5:17 PM, Gaier, Bjoern via llvm-dev wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span lang="DE">Dear LLVM-Mailing-List,</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="DE"> </span><o:p></o:p></p>
<p class="MsoNormal">I’m using the llvm::EngineBuilder to create an instance of the llvm::ExecutionEngine, I then JIT my code, take the addresses I need and delete the llvm::ExecutionEngine. But now I started to wonder, if I could reuse that instance for a
new module again?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I first tried calling llvm::EngineBuilder without setting a Module, I planned to add it later – but when I do this the “create” function will crash.<o:p></o:p></p>
</blockquote>
<p class="MsoNormal">What crash you get? By quickly looking through interface, EngineBuilder uses nullptr if no module are provided.
<br>
<br>
<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Another test I ran was calling “removeModule” of the llvm::ExecutionEngine after the call to finalizeObject. Then I added the same module again and ran finalizeObject again. The result was weird, I suddenly became error messages about
the relocation – I take this came because I applied a memory mapping in the first run.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">So to make it short: Is the llvm::ExecutionEngine designed for a reuse or is it better to create a new instance again?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Kind greetings<o:p></o:p></p>
<p class="MsoNormal">Björn<o:p></o:p></p>
<p class="MsoNormal">Als GmbH eingetragen im Handelsregister Bad Homburg v.d.H. HRB 9816, USt.ID-Nr. DE 114 165 789 Geschäftsführer: Dr. Hiroshi Nakamura, Dr. Robert Plank, Markus Bode, Heiko Lampert, Takashi Nagano, Takeshi Fukushima. Junichi Tajika
<br>
<br>
<o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>LLVM Developers mailing list<o:p></o:p></pre>
<pre><a href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a><o:p></o:p></pre>
<pre><a href="https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev">https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev</a><o:p></o:p></pre>
</blockquote>
<pre>-- <o:p></o:p></pre>
<pre>Have a great day!<o:p></o:p></pre>
<pre>PreeJackie<o:p></o:p></pre>
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Als GmbH eingetragen im Handelsregister Bad Homburg v.d.H. HRB 9816, USt.ID-Nr. DE 114 165 789 Geschäftsführer: Dr. Hiroshi Nakamura, Dr. Robert Plank, Markus Bode, Heiko Lampert, Takashi Nagano, Takeshi Fukushima. Junichi Tajika
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