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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks, Eran.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I’m not sure how soon I’ll have a solution for you, but it’s on my to-do list now. I’ll also create a bugzilla record for this problem.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">-Andy<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Weiss, Eran [mailto:Eran.Weiss@emc.com]
<br>
<b>Sent:</b> Thursday, April 11, 2013 12:40 AM<br>
<b>To:</b> Kaylor, Andrew<br>
<b>Cc:</b> llvmdev@cs.uiuc.edu; Jim Grosbach; Jiong Wang<br>
<b>Subject:</b> Re: [LLVMdev] Migration from JIT to MCJIT<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">Andrew,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">I've attached a small reproduction of the issue.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">Reproduce by:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">$ /usr/bin/g++ `llvm-config --cxxflags` -g -m32 -c mcjit_external_symbol.cpp<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">$ /usr/bin/g++ `llvm-config --ldflags` -g -m32 -o mcjit_external_symbol mcjit_external_symbol.o `llvm-config --libs all`<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">$ ./mcjit_external_symbol <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">verifying... <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">LLVM ERROR: Program used external function '_external' which could not be resolved!<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">Note that using JIT the code works fine, in case it might help.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">Eran.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">From:
</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">"Kaylor, Andrew" <<a href="mailto:andrew.kaylor@intel.com">andrew.kaylor@intel.com</a>><br>
<b>Date: </b>Wed, 10 Apr 2013 20:50:14 -0400<br>
<b>To: </b>Eran Weiss <<a href="mailto:eran.weiss@emc.com">eran.weiss@emc.com</a>><br>
<b>Cc: </b>"<a href="mailto:llvmdev@cs.uiuc.edu">llvmdev@cs.uiuc.edu</a>" <<a href="mailto:llvmdev@cs.uiuc.edu">llvmdev@cs.uiuc.edu</a>>, Jim Grosbach <<a href="mailto:grosbach@apple.com">grosbach@apple.com</a>>, Jiong Wang <<a href="mailto:jiwang@tilera.com">jiwang@tilera.com</a>><br>
<b>Subject: </b>RE: [LLVMdev] Migration from JIT to MCJIT<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Eran,</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Is there any chance you could boil this down to a small reproducer?</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I’ve got a mid-to-long-term goal of getting rid of the ugliness in LLDB that Jim mentioned, and fixing your problem would be a good first step.</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks,</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Andy</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"> Jim Grosbach [<a href="mailto:grosbach@apple.com">mailto:grosbach@apple.com</a>]
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<b>Sent:</b> Wednesday, April 10, 2013 4:19 PM<br>
<b>To:</b> Kaylor, Andrew; Jiong Wang<br>
<b>Cc:</b> Weiss, Eran; <a href="mailto:llvmdev@cs.uiuc.edu">llvmdev@cs.uiuc.edu</a><br>
<b>Subject:</b> Re: [LLVMdev] Migration from JIT to MCJIT</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">Existing clients (LLDB) deal with externals by resolving them to constant function pointers that are referenced in the IR. That’s obviously ugly as hell, but it gets things done.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">The old JIT was able to simplify things because it assumed the JITed code was running in the same process as the JIT compiler. The MCJIT doesn’t assume that, so it has to handle more possibilities. For example,
that the invoked function may be in a dylib which hasn’t yet been loaded into the target address space. I suggest having a look at the ld64, lld and dyld implementations to see what these relocation really imply. You won’t have to solve all of the potential
scenarios to get anything done, but you will want to make sure to carefully check which use-case you’re in and error out when it’s one you haven’t handled yet. The worst case is if the code makes overly broad assumptions about possible inputs and resolves
a relocation incorrectly in some subtle way. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">-Jim<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">On Apr 10, 2013, at 11:49 AM, "Kaylor, Andrew" <<a href="mailto:andrew.kaylor@intel.com">andrew.kaylor@intel.com</a>> wrote:<o:p></o:p></span></p>
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<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The MachO handling isn’t always straightforward in that it has a lot of bit fields to handle while it’s also trying to accommodate the format abstractions baked
into the interfaces. The actual relocation type gets extracted in the RuntimeDyldMachO::resolveRelocation function (RuntimeDyldMachO.cpp:32) before it is passed on to the architecture-specific handlers. So the mask you mentioned is probably OK.</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The fact that this relocation type isn’t handled is, of course, the root of your problem.</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">MCJIT has grown on an as-needed basis up to now, with only the relocation types we were actually seeing being implemented. Unfortunately, I don’t know enough
about MachO to help with this one. Maybe Jim Grosbach can help?</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">-Andy</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">From:</span></b><span class="apple-converted-space"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"> </span></span><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"><a href="mailto:llvmdev-bounces@cs.uiuc.edu">llvmdev-bounces@cs.uiuc.edu</a>
[<a href="mailto:llvmdev-bounces@cs.uiuc.edu">mailto:llvmdev-bounces@cs.uiuc.edu</a>]<span class="apple-converted-space"> </span><b>On Behalf Of<span class="apple-converted-space"> </span></b>Weiss, Eran<br>
<b>Sent:</b><span class="apple-converted-space"> </span>Tuesday, April 09, 2013 11:51 PM<br>
<b>To:</b><span class="apple-converted-space"> </span>Jiong Wang<br>
<b>Cc:</b><span class="apple-converted-space"> </span><a href="mailto:llvmdev@cs.uiuc.edu">llvmdev@cs.uiuc.edu</a><br>
<b>Subject:</b><span class="apple-converted-space"> </span>Re: [LLVMdev] Migration from JIT to MCJIT</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"> <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">Thank you for the help.</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"> </span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">The relocation type value is anded with </span><span class="apple-style-span"><span style="font-size:8.5pt;font-family:Menlo;color:#2C2ECF">0xffffffffL</span></span><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">.
(RuntimeDyldMachO.cpp:214)</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">Maybe this mask should be different?</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">Anyway, it seems like this relocation isn't implemented. (RuntimeDyldMachO.cpp:104)</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"> </span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">From:<span class="apple-converted-space"> </span></span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">Jiong Wang <<a href="mailto:jiwang@tilera.com"><span style="color:purple">jiwang@tilera.com</span></a>><br>
<b>Date:<span class="apple-converted-space"> </span></b>Tue, 9 Apr 2013 09:42:03 -0400<br>
<b>To:<span class="apple-converted-space"> </span></b>Eran Weiss <<a href="mailto:eran.weiss@emc.com"><span style="color:purple">eran.weiss@emc.com</span></a>><br>
<b>Cc:<span class="apple-converted-space"> </span></b>"<a href="mailto:llvmdev@cs.uiuc.edu"><span style="color:purple">llvmdev@cs.uiuc.edu</span></a>" <<a href="mailto:llvmdev@cs.uiuc.edu"><span style="color:purple">llvmdev@cs.uiuc.edu</span></a>><br>
<b>Subject:<span class="apple-converted-space"> </span></b>Re: [LLVMdev] Migration from JIT to MCJIT</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"> </span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"MS Gothic";color:black">于</span><span class="apple-converted-space"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"> </span></span><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">2013/4/9
21:08, Weiss, Eran<span class="apple-converted-space"> </span></span><span style="font-size:10.5pt;font-family:"MS Gothic";color:black">写道</span><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">:</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">Hi,</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"> </span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">I'm migrating my code (running on mac) from using JIT to MCJIT. My code generates in memory, mostly using the llvm-c api, and then runs the generated code.</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">When I try to use MCJIT I encounter a problem with relocations of external symbols – functions compiled statically beforehand with gcc.</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"> </span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">I get the following error:</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">Invalid relocation type!</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">UNREACHABLE executed at /Users/weisse4/dev/llvm/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldMachO.cpp:89</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">While debugging, I see that the relocation type read in is 218103811, which seems corrupt to me.</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black"><br>
Hi Weiss,<br>
<br>
I do not have any experience on Mach binary format, but the hex value of 218103811 is 0xd000003 (maybe the relocation type is RIT_Generic_PreboundLazyPointer = 3), something looks like a relocation entry composed of "symbol index" + "relocation type".<br>
maybe something is wrong, that the relocation entry is not anded with a mask to get the final relocation type.<br>
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---<br>
Regards,<br>
Jiong<br>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">Did someone encounter a similar error? Or can direct me to changes that I need to do while migrating from JIT to MCJIT?</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:black">Thanks.</span><span style="color:black"><o:p></o:p></span></p>
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<pre><span style="color:black">_______________________________________________<o:p></o:p></span></pre>
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