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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Per Tanya’s email from yesterday :<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">===========================================<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">All,<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">Going forward, please email </span><a href="mailto:bugs-admin@lists.llvm.org"><span lang="EN-US">bugs-admin@lists.llvm.org</span></a><span lang="EN-US"> for all Bugzilla related requests (accounts, components, products,
etc).<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US">There are currently 5 administrators and hopefully the turn around time will be faster.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoPlainText">Thanks,<o:p></o:p></p>
<p class="MsoPlainText">Tanya<o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">===========================================<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Not sure to whom the account creation request was addressed, so forwarding this to the proper list in case this was not done before.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Please let me know if nothing has changed by the end of your day.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Kind regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Arnaud<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" 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 lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> llvm-foundation [mailto:llvm-foundation-bounces@lists.llvm.org]
<b>On Behalf Of </b>Philip Reames via llvm-foundation<br>
<b>Sent:</b> 20 April 2017 19:58<br>
<b>To:</b> llvm-foundation@lists.llvm.org<br>
<b>Subject:</b> [llvm-foundation] Fwd: Re: [llvm-dev] Possible stack corruption during call to JITSymbol::getAddress()<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p>FYI: this is the third person I know of who has run into problems getting a bugzilla account created. This needs addressed ASAP.<o:p></o:p></p>
<p>Philip<o:p></o:p></p>
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<p class="MsoNormal"><br>
<br>
-------- Forwarded Message -------- <o:p></o:p></p>
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<p class="MsoNormal" align="right" style="text-align:right"><b>Subject: <o:p></o:p></b></p>
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<td style="padding:0cm 0cm 0cm 0cm">
<p class="MsoNormal">Re: [llvm-dev] Possible stack corruption during call to JITSymbol::getAddress()<o:p></o:p></p>
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<p class="MsoNormal" align="right" style="text-align:right"><b>Date: <o:p></o:p></b></p>
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<p class="MsoNormal">Thu, 20 Apr 2017 09:42:39 -0700<o:p></o:p></p>
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<p class="MsoNormal" align="right" style="text-align:right"><b>From: <o:p></o:p></b></p>
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<td style="padding:0cm 0cm 0cm 0cm">
<p class="MsoNormal">David Lurton via llvm-dev <a href="mailto:llvm-dev@lists.llvm.org">
<llvm-dev@lists.llvm.org></a><o:p></o:p></p>
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<p class="MsoNormal" align="right" style="text-align:right"><b>Reply-To: <o:p></o:p></b></p>
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<td style="padding:0cm 0cm 0cm 0cm">
<p class="MsoNormal">David Lurton <a href="mailto:dlurton@gmail.com"><dlurton@gmail.com></a><o:p></o:p></p>
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<p class="MsoNormal" align="right" style="text-align:right"><b>To: <o:p></o:p></b></p>
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<td style="padding:0cm 0cm 0cm 0cm">
<p class="MsoNormal">Lang Hames <a href="mailto:lhames@gmail.com"><lhames@gmail.com></a><o:p></o:p></p>
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<p class="MsoNormal" align="right" style="text-align:right"><b>CC: <o:p></o:p></b></p>
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<td style="padding:0cm 0cm 0cm 0cm">
<p class="MsoNormal">LLVM Developers Mailing List <a href="mailto:llvm-dev@lists.llvm.org">
<llvm-dev@lists.llvm.org></a><o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
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<p class="MsoNormal">Well, 3 days later and so far nobody has responded to my request for an account on
<a href="http://bugs.llvm.org">bugs.llvm.org</a>.. so it doesn't look like I'm going to be able to create that bug on my own, unfortunately.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, Apr 19, 2017 at 6:27 PM, Lang Hames <<a href="mailto:lhames@gmail.com" target="_blank">lhames@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hi David, <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<div>
<p class="MsoNormal">Thanks very much for that. I'll continue to dig in as time permits, and I'll update the bug report with my progress once it's filed.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<div>
<p class="MsoNormal">Cheers,<o:p></o:p></p>
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<div>
<p class="MsoNormal">Lang.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Mon, Apr 17, 2017 at 6:42 PM, David Lurton <<a href="mailto:dlurton@gmail.com" target="_blank">dlurton@gmail.com</a>> wrote:<o:p></o:p></p>
<div>
<p class="MsoNormal">Thanks Lang. I think I'll go the bug creation route. I have an email out to llvm-admin requesting an account on
<a href="http://bugs.llvm.org" target="_blank">bugs.llvm.org</a>. I'll let you know when I've filed the bug.<o:p></o:p></p>
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<div>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Sun, Apr 16, 2017 at 9:44 PM, Lang Hames <<a href="mailto:lhames@gmail.com" target="_blank">lhames@gmail.com</a>> wrote:<o:p></o:p></p>
<div>
<p class="MsoNormal">Hi David, <o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">This looks like bad eh-frame data due to a failure to fix up the frame descriptor entries:<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
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<div>
<p class="MsoNormal"><span style="font-family:"Courier New""><debug: adding frame> EHFrameAddr: 0x7feae5827000, EHFrameLoadAddr: 0x00000000e5827000, EHFrameSize: 60</span><o:p></o:p></p>
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<div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">==64588==ERROR: AddressSanitizer: SEGV on unknown address 0x7feae5827020 (pc 0x7feae886d970 bp 0x000000000001 sp 0x7ffca10e75f8 T0)</span><o:p></o:p></p>
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<div>
<p class="MsoNormal"><o:p> </o:p></p>
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<div>
<p class="MsoNormal">Eyeballing the code in RuntimeDyldELF (vs RuntimeDyldMachO, which is doing the right thing) I see it lacks the necessary fixups. If you're feeling game you can try to port RuntimeDyldMachO's solution to RuntimeDyldELF (where MachO uses
a template argument, you'll need to switch over the RuntimeDyldImpl Arch member to determine the pointer size for the fixup). Otherwise you should file a bug on
<a href="http://bugs.llvm.org" target="_blank">bugs.llvm.org</a> and CC me, and then I can CC some of the ELF devs and see if anyone has time.<o:p></o:p></p>
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<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">In the mean time, turning off exception support should fix this, though I'm not sure whether that's a viable option for your use case.<o:p></o:p></p>
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<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Cheers,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Lang.<o:p></o:p></p>
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<div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Thu, Apr 13, 2017 at 10:53 AM, Lang Hames <<a href="mailto:lhames@gmail.com" target="_blank">lhames@gmail.com</a>> wrote:<o:p></o:p></p>
<div>
<p class="MsoNormal">Hi David, <o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">This is definitely the right place to ask.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<div>
<p class="MsoNormal">Let me see if I can reproduce this locally...<o:p></o:p></p>
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<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Cheers,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Lang.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<div>
<div>
<p class="MsoNormal">On Sun, Apr 9, 2017 at 2:02 PM, David Lurton via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<o:p></o:p></p>
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<div>
<p class="MsoNormal">Firstly, apologies if this is not the right place to be asking this question--feel free to point me in the correct direction. I could be doing something wrong here but stackoverflow didn't feel like the correct place for this since there's
so little there about LLVM ORC. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<div>
<div>
<div>
<p class="MsoNormal">Basically, I have a reproduction case (below) where if I throw an exception before I call JITSymbol::getAddress() everything works properly but throwing the same exception afterward will result in a SIGSEGV during stack unwinding. This
suggests to me that somehow the stack is getting corrupted during the JITSymbol::getAddress() call. <o:p></o:p></p>
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<div>
<p class="MsoNormal"><o:p> </o:p></p>
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<div>
<p class="MsoNormal">This problem was initially discovered while working on my own project. While troubleshooting this I've discvoered that when LLVM is<span style="font-family:"Courier New"">-DLLVM_USE_SANITIZER:STRING=Address </span><span style="font-family:"Arial","sans-serif"">the
problem happens at different points during execution, perhaps having something to do with the padding around the stack variables added by the sanitizer? See the note after the call to runTest() in main().</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<div>
<p class="MsoNormal">I'm running this under an up-to-date Antergos Linux, clang version: 3.9.1 (tried compiling LLVM and the example program below with gcc 6.3.1 and the result is the same) clang set to default compiler by setting the following environment
variables:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> CC=/usr/bin/clang</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> CXX=/usr/bin/clang++</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Commands used to build LLVM:<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> git clone <a href="https://github.com/llvm-mirror/llvm.git" target="_blank">
https://github.com/llvm-mirror/llvm.git</a></span><o:p></o:p></p>
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<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> git checkout release_40</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> cd llvm</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> mkdir build</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> cd build</span><o:p></o:p></p>
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<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> cmake .. -DLLVM_BUILD_LLVM_DYLIB:BOOL=ON -DLLVM_ENABLE_RTTI:BOOL=ON -DLLVM_ENABLE_EH:BOOL=ON -DLLVM_USE_SANITIZER:STRING=Address -DLLVM_PARALLEL_COMPILE_JOBS:STRING=8 -DLLVM_ENABLE_ASSERTIONS:BOOL=ON</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> cmake --build . -- -j 8</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> sudo cmake --build . --target install</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Command used to build test case executable:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<div>
<p class="MsoNormal"> clang test.cpp -std=c++14 -lstdc++ -lLLVM-4.0 -Wall -pedantic -Wextra -fstack-protector-all -fsanitize=address -fexceptions<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Then of course:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New""> ./a.out</span><o:p></o:p></p>
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<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
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<p class="MsoNormal">Output from the a.out:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<div>
<blockquote style="margin-left:30.0pt;margin-right:0cm">
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<p class="MsoNormal"><span style="font-family:"Courier New"">ASAN:DEADLYSIGNAL</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">=================================================================</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">==6582==ERROR: AddressSanitizer: SEGV on unknown address 0x7f59eeb06020 (pc 0x7f59f1b20930 bp 0x000000000001 sp 0x7ffc5e546218 T0)</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">==6582==The signal is caused by a READ memory access.</span><o:p></o:p></p>
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</blockquote>
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<div>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">The result if running `backtrace` in GDB while execution is paused after the SIGSEGV occurs:</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<blockquote style="margin-left:30.0pt;margin-right:0cm">
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<p class="MsoNormal"><span style="font-family:"Courier New"">#0 read_encoded_value_with_base (encoding=encoding@entry=28 '\034', base=base@entry=0, p=p@entry=0x7fffe8a06020 <error: Cannot access memory at address 0x7fffe8a06020>, val=val@entry=0x7fffffffd6d8)
at /build/gcc/src/gcc/libgcc/unwind-pe.h:252</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">#1 0x00007fffeba05a61 in binary_search_single_encoding_fdes (pc=0x7fffeba04426 <_Unwind_Resume+54>, ob=0x0) at /build/gcc/src/gcc/libgcc/unwind-dw2-fde.c:908</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">#2 search_object (ob=ob@entry=0x60400001d9d0, pc=pc@entry=0x7fffeba04426 <_Unwind_Resume+54>) at /build/gcc/src/gcc/libgcc/unwind-dw2-fde.c:977</span><o:p></o:p></p>
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<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">#3 0x00007fffeba05fdd in _Unwind_Find_registered_FDE (bases=0x7fffffffda78, pc=0x7fffeba04426 <_Unwind_Resume+54>) at /build/gcc/src/gcc/libgcc/unwind-dw2-fde.c:1013</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">#4 _Unwind_Find_FDE (pc=0x7fffeba04426 <_Unwind_Resume+54>, bases=bases@entry=0x7fffffffda78) at /build/gcc/src/gcc/libgcc/unwind-dw2-fde-dip.c:454</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">#5 0x00007fffeba02b23 in uw_frame_state_for (context=context@entry=0x7fffffffd9d0, fs=fs@entry=0x7fffffffd820) at /build/gcc/src/gcc/libgcc/unwind-dw2.c:1241</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">#6 0x00007fffeba03d40 in uw_init_context_1 (context=context@entry=0x7fffffffd9d0, outer_cfa=outer_cfa@entry=0x7fffffffdc00, outer_ra=0x5110fc) at /build/gcc/src/gcc/libgcc/unwind-dw2.c:1562</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">#7 0x00007fffeba04427 in _Unwind_Resume (exc=0x60d00000c7b0) at /build/gcc/src/gcc/libgcc/unwind.inc:224</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">#8 0x00000000005110fc in runTest () at /home/dave/projects/untitled/test.cpp:124</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">#9 0x0000000000511138 in main (argc=1, argv=0x7fffffffe698) at /home/dave/projects/untitled/test.cpp:132</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</blockquote>
</div>
<div>
<p class="MsoNormal">My test-case is below. In runTest(), note the commented out throw statement before symbol.getAddress() and the uncommented one after it. Also note the comments after the call to runTest() in main().<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Thanks.<o:p></o:p></p>
</div>
<div>
<blockquote style="margin-left:30.0pt;margin-right:0cm">
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">#include "llvm/ADT/STLExtras.h"</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">#include "llvm/ExecutionEngine/ExecutionEngine.h"</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">#include "llvm/IR/IRBuilder.h"</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">#include "llvm/ExecutionEngine/SectionMemoryManager.h"</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">#include "llvm/ExecutionEngine/Orc/CompileUtils.h"</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">#include "llvm/ExecutionEngine/Orc/IRCompileLayer.h"</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">#include "llvm/ExecutionEngine/Orc/LambdaResolver.h"</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">#include "llvm/ExecutionEngine/Orc/ObjectLinkingLayer.h"</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">#include "llvm/IR/Mangler.h"</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">#include "llvm/Support/DynamicLibrary.h"</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">#include "llvm/Support/TargetSelect.h"</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">#include <iostream></span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">using namespace llvm;</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">using namespace llvm::orc;</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">/** This class taken verbatim from</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> * <a href="https://github.com/llvm-mirror/llvm/blob/release_40/examples/Kaleidoscope/BuildingAJIT/Chapter1/KaleidoscopeJIT.h" target="_blank">
https://github.com/llvm-mirror/llvm/blob/release_40/examples/Kaleidoscope/BuildingAJIT/Chapter1/KaleidoscopeJIT.h</a></span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> * This is from the same revision of LLVM I am using (the release_40 branch as of 4/8/2017)</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> */</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">class KaleidoscopeJIT {</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">private:</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> std::unique_ptr<TargetMachine> TM;</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> const DataLayout DL;</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> ObjectLinkingLayer<> ObjectLayer;</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> IRCompileLayer<decltype(ObjectLayer)> CompileLayer;</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">public:</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> typedef decltype(CompileLayer)::ModuleSetHandleT ModuleHandle;</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> KaleidoscopeJIT()</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> : TM(EngineBuilder().selectTarget()), DL(TM->createDataLayout()),</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> CompileLayer(ObjectLayer, SimpleCompiler(*TM)) {</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> llvm::sys::DynamicLibrary::LoadLibraryPermanently(nullptr);</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> }</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> TargetMachine &getTargetMachine() { return *TM; }</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> ModuleHandle addModule(std::unique_ptr<Module> M) {</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> // Build our symbol resolver:</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> // Lambda 1: Look back into the JIT itself to find symbols that are part of</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> // the same "logical dylib".</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> // Lambda 2: Search for external symbols in the host process.</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> auto Resolver = createLambdaResolver(</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> [&](const std::string &Name) {</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> if (auto Sym = CompileLayer.findSymbol(Name, false))</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> return Sym;</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> return JITSymbol(nullptr);</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> },</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> [](const std::string &Name) {</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> if (auto SymAddr =</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> RTDyldMemoryManager::getSymbolAddressInProcess(Name))</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> return JITSymbol(SymAddr, JITSymbolFlags::Exported);</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> return JITSymbol(nullptr);</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> });</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> // Build a singleton module set to hold our module.</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> std::vector<std::unique_ptr<Module>> Ms;</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> Ms.push_back(std::move(M));</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> // Add the set to the JIT with the resolver we created above and a newly</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> // created SectionMemoryManager.</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> return CompileLayer.addModuleSet(std::move(Ms),</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> make_unique<SectionMemoryManager>(),</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> std::move(Resolver));</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> }</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> JITSymbol findSymbol(const std::string Name) {</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> std::string MangledName;</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> raw_string_ostream MangledNameStream(MangledName);</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> Mangler::getNameWithPrefix(MangledNameStream, Name, DL);</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> return CompileLayer.findSymbol(MangledNameStream.str(), true);</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> }</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> void removeModule(ModuleHandle H) {</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> CompileLayer.removeModuleSet(H);</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> }</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">};</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">const std::string FUNC_NAME = "someFunction";</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">void runTest() {</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> llvm::LLVMContext context;</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> llvm::IRBuilder<> irBuilder{context};</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> KaleidoscopeJIT jit;</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> auto module = std::make_unique<llvm::Module>("help", context);</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> module->setDataLayout(jit.getTargetMachine().createDataLayout());</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> auto function = llvm::cast<llvm::Function>(module->getOrInsertFunction(FUNC_NAME,</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> llvm::Type::getInt32Ty(context), nullptr));</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> auto block = llvm::BasicBlock::Create(context, "functionBody", function);</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> irBuilder.SetInsertPoint(block);</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> irBuilder.CreateRet(llvm::ConstantInt::get(context, llvm::APInt(32, 1, true)));</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> jit.addModule(std::move(module));</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> llvm::JITSymbol symbol = jit.findSymbol(FUNC_NAME);</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> //Just to ensure that the symbol is in fact valid (symbol evaluates to true during execution)</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> if(!symbol) {</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> throw std::runtime_error("Symbol not found");</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> }</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> //when uncommented, the throw statement does NOT cause a SIGSEGV.</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> //throw std::runtime_error("This should not crash.");</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> uint64_t ptr = symbol.getAddress();</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> //HOWEVER... a SIGSEGV occurs during stack-unwinding while throwing the exception below.</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> //Hence, the call to symbol.getAddress() must be causing some kind of memory corruption.</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> //My guess is that it's clobbering the stack.</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> throw std::runtime_error("This should not crash but does anyway.");</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> std::cout << "Ptr is " << ptr << "\n";</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> int (*someFuncPtr)() = reinterpret_cast<int (*)()>(ptr);</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> //int (*someFuncPtr)() = (int (*)())ptr;</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> int returnValue = someFuncPtr();</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> std::cout << "Return value is: " << returnValue << "\n";</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">}</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New"">int main(int argc, char **argv) {</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> llvm::InitializeNativeTarget();</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> llvm::InitializeAllAsmPrinters();</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> try {</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> runTest();</span><o:p></o:p></p>
</div>
</blockquote>
<blockquote style="margin-left:30.0pt;margin-right:0cm">
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> //NOTE: if LLVM is compiled without -DLLVM_USE_SANITIZER:STRING=Address, the last throw in runTest() does not cause</span><o:p></o:p></p>
</div>
</blockquote>
<blockquote style="margin-left:30.0pt;margin-right:0cm">
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> //a SIGSEGV, however this throw will.</span><o:p></o:p></p>
</div>
</blockquote>
<blockquote style="margin-left:30.0pt;margin-right:0cm">
<div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> //throw std::runtime_error("This should not crash but does anyway.");</span><o:p></o:p></p>
</div>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> } catch(std::runtime_error &e) {</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> std::cout << "Exception caught: " << e.what() << "\n";</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> }</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> llvm::llvm_shutdown();</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-family:"Courier New""> return 0;</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-family:"Courier New"">}<br>
<br>
</span><o:p></o:p></p>
</div>
</blockquote>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</div>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</div>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</div>
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