<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">I'm by no means an expert on the JIT layers, but ExecutionEngine is an abstract interface. In theory, each implementation of that interface should function similarly, but in practice YMMV. You're using MCJIT, which is the older JIT flow which is not getting a lot of attention these days. You might get further if you switch to using the OrcMCJITReplacement, or migrate to the Orc APIs more generally.<div class=""><br class=""></div><div class="">There are some very handy new interfaces in the Orc APIs, like the LLJIT classes which get things going pretty easy. I've been using LLJIT in my project, and it is really easy to setup, keep around and add multiple IR modules to.</div><div class=""><br class=""></div><div class="">-Chris<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On May 7, 2019, at 11:00 PM, Gaier, Bjoern via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" class="">llvm-dev@lists.llvm.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="WordSection1" style="page: WordSection1; caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none;"><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: windowtext;" class="">Heyho,<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: windowtext;" class="">I can only provide you with a screenshot for the first problem I noticed:<br class=""><span id="cid:image001.png@01D50573.89F0B850"><image001.png></span><o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: windowtext;" class="">This code will crash when calling “eeBuilder.create”.<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: windowtext;" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: windowtext;" class="">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 class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: windowtext;" class="">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 class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: windowtext;" class="">If I add a different module everything behaves as before – so overall it seems like you can’t reuse a llvm::ExecutionEngine…<o:p class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span style="color: windowtext;" class=""><o:p class=""> </o:p></span></div><div class=""><div style="border-style: solid none none; border-top-width: 1pt; border-top-color: rgb(225, 225, 225); padding: 3pt 0cm 0cm;" class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><b class=""><span style="color: windowtext;" class="">From:</span></b><span style="color: windowtext;" class=""><span class="Apple-converted-space"> </span>llvm-dev <<a href="mailto:llvm-dev-bounces@lists.llvm.org" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">llvm-dev-bounces@lists.llvm.org</a>><span class="Apple-converted-space"> </span><b class="">On Behalf Of<span class="Apple-converted-space"> </span></b>preejackie via llvm-dev<br class=""><b class="">Sent:</b><span class="Apple-converted-space"> </span>Dienstag, 7. Mai 2019 15:28<br class=""><b class="">To:</b><span class="Apple-converted-space"> </span><a href="mailto:llvm-dev@lists.llvm.org" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">llvm-dev@lists.llvm.org</a><br class=""><b class="">Subject:</b><span class="Apple-converted-space"> </span>Re: [llvm-dev] Reuse llvm::ExecutionEngine<o:p class=""></o:p></span></div></div></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><p class=""><span style="font-family: "Courier New";" class="">Hi Bjoern,</span><o:p class=""></o:p></p><p class=""><span style="font-family: "Courier New";" class="">Could you please give me a minimal code sample to produce this behavior?</span><o:p class=""></o:p></p><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">On 07/05/19 5:17 PM, Gaier, Bjoern via llvm-dev wrote:<o:p class=""></o:p></div></div><blockquote style="margin-top: 5pt; margin-bottom: 5pt;" class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="DE" class="">Dear LLVM-Mailing-List,</span><o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><span lang="DE" class=""> </span><o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">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 class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""> <o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">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 class=""></o:p></div></blockquote><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">What crash you get? By quickly looking through interface, EngineBuilder uses nullptr if no module are provided.<span class="Apple-converted-space"> </span><br class=""><br class=""><o:p class=""></o:p></div><blockquote style="margin-top: 5pt; margin-bottom: 5pt;" class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""> <o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">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 class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""> <o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">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 class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""> <o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Kind greetings<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Björn<o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Als GmbH eingetragen im Handelsregister Bad Homburg v.d.H. 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Junichi Tajika<span class="Apple-converted-space"> </span><br class=""><br class=""><o:p class=""></o:p></div><pre style="margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: "Courier New";" class="">_______________________________________________<o:p class=""></o:p></pre><pre style="margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: "Courier New";" class="">LLVM Developers mailing list<o:p class=""></o:p></pre><pre style="margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: "Courier New";" class=""><a href="mailto:llvm-dev@lists.llvm.org" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">llvm-dev@lists.llvm.org</a><o:p class=""></o:p></pre><pre style="margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: "Courier New";" class=""><a href="https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev</a><o:p class=""></o:p></pre></blockquote><pre style="margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: "Courier New";" class="">-- <o:p class=""></o:p></pre><pre style="margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: "Courier New";" class="">Have a great day!<o:p class=""></o:p></pre><pre style="margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: "Courier New";" class="">PreeJackie<o:p class=""></o:p></pre></div><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; float: none; display: inline !important;" class="">Als GmbH eingetragen im Handelsregister Bad Homburg v.d.H. 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