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<p class="MsoNormal">Hello LLVM-Mailing list,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">in the past I was using the MCJIT (if I understand it correctly) to load IR modules, compile them and execute them. The speciality of this JIT was, that it was writing the compiled code into a shared memory - for a different process to
execute them. For that task the JIT used a 'custom' memory manager, memory mapping and also resolved undefined references itself.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I was told some month ago, that MCJIT is heavily outdated and that I should move on to Orc JIT. So I did this today by reading the first Kaleidoscope Tutorial. Of course, I'm far away from having an understanding about the Orc JIT but I
already miss all of the features I need to port my old JIT to the Orc JIT.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">So I did some research and have some questions now:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">1.) Memory Manager<o:p></o:p></p>
<p class="MsoNormal">I saw that I can actually replace the Memory Manager via the constructor of the "RTDyldObjectLinkingLayer" - is that correct?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">2.) JITDyLib<o:p></o:p></p>
<p class="MsoNormal">I think, but I'm not sure, that I can use a JITDyLib to inject my own addresses for different functions, but I'm not sure how to do that - or if I'm correct with it.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">3.) Legacy Layer<o:p></o:p></p>
<p class="MsoNormal">I later looked into the third Kaleidoscope Tutorial, seeing the "LegacyRTDyldObjectLinkingLayer" and "LegacyIRCompileLayer" - that looked promising!
<o:p></o:p></p>
<p class="MsoNormal">But sadly the tutorial state that it was not updated yet to the new OrcJIT API - so... I have difficulties 'trusting' that tutorial. Does it mean, that those Legacy Layer will be removed soon? Or that you should not use them? The term legacy
worries me actually.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">4.) Reusing the JIT<o:p></o:p></p>
<p class="MsoNormal">With the MCJIT I noticed that you can not simply 'reset' the JIT and re-run it for a new compilation. What I mean with that is, I wanted to compile a IR module and then reset the MCJIT like it never compiled anything, so that I can set
it up again, while not having to free the memory I already allocated.<o:p></o:p></p>
<p class="MsoNormal">Is something possible with the Orc JIT?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you for your help in advance!<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>
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