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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Hello,<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'>Any update on this review?<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'>Thanks,<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'>Yin <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'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> mehdi.amini@apple.com [mailto:mehdi.amini@apple.com] <br><b>Sent:</b> Friday, January 08, 2016 8:30 AM<br><b>To:</b> Yin Ma<br><b>Cc:</b> llvm-commits<br><b>Subject:</b> Re: Fix LTO unreferenced symbol bug due to alias renaming<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hi,<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Let’s wait Monday, Rafael should be back, it may be easier for him to come up with a simpler test (or he may just take the patch without any tests, we’ll see).<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>— <o:p></o:p></p></div><div><p class=MsoNormal>Mehdi<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p><div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=MsoNormal>On Jan 7, 2016, at 5:20 PM, Yin Ma <<a href="mailto:yinma@codeaurora.org">yinma@codeaurora.org</a>> wrote:<o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Hi Mehdi,</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'> </span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>It is not straight forward to reduce it. If it is just<span class=apple-converted-space> </span></span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Extern foo from 1.ll</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Define foo from 2.ll</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Extern foo from 3.ll</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>It wouldn’t show the problem. The definition of foo have to be recorded by</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>scanning other codes before the definition is resolved.<span class=apple-converted-space> </span></span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'> </span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>The current test case is about 1000 lines with a lot of<span class=apple-converted-space> </span></span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>c++ setup. It has to be</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>in three files like</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>llvm-link 1.ll 2.ll 3.ll –o lto.o</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>llvm-nm lto.o</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>it shows<span class=apple-converted-space> </span></span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'> U _ZN7cOfooD2Ev</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>-------- T _ZN7cOfooD2Ev.1</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Which later causes _ZN7cOfooD2Ev unreferenced. Because the definition of<span class=apple-converted-space> </span></span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>_ZN7cOfooD2Ev becomes ZN7cOfooD2Ev.1</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'> </span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>_ZN7cOfooD2Ev is renamed in copyGlobalValueProto(SGV, ShouldLink);</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Because there is already a value with the same name when 1.ll is processed.</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'> </span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>I hope you could come up a test case based on my description if you are</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>familiar with what IRMover.cpp is doing. Or you have an automatic tool to<span class=apple-converted-space> </span></span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>have me to reduce it further.</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'> </span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Thanks,</span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'> </span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Yin<span class=apple-converted-space> </span></span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'> </span><o:p></o:p></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'> </span><o:p></o:p></p></div><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><div><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span class=apple-converted-space><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> </span></span><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><a href="mailto:mehdi.amini@apple.com">mehdi.amini@apple.com</a> [<a href="mailto:mehdi.amini@apple.com">mailto:mehdi.amini@apple.com</a>]<span class=apple-converted-space> </span><br><b>Sent:</b><span class=apple-converted-space> </span>Thursday, January 07, 2016 4:39 PM<br><b>To:</b><span class=apple-converted-space> </span>Yin Ma<br><b>Cc:</b><span class=apple-converted-space> </span>llvm-commits<br><b>Subject:</b><span class=apple-converted-space> </span>Re: Fix LTO unreferenced symbol bug due to alias renaming</span><o:p></o:p></p></div></div></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>Hi,<o:p></o:p></p></div><div><div><p class=MsoNormal> <o:p></o:p></p></div></div><div><div><p class=MsoNormal>I’d rather have a test case with it. <o:p></o:p></p></div></div><div><div><p class=MsoNormal>Is it hard to “anonymize” the test case? I don’t expect it to be large considering your description of the problem, you should be able to discard almost all the body of all function, strip the metadata, strip the function parameter, strip the custom types if any, and rename the few remaining function to foo and bar?<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><div><div><p class=MsoNormal>Mehdi<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><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><div><p class=MsoNormal>On Jan 7, 2016, at 4:29 PM, Yin Ma <<a href="mailto:yinma@codeaurora.org"><span style='color:purple'>yinma@codeaurora.org</span></a>> wrote:<o:p></o:p></p></div></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Hi Mehdi,</span><o:p></o:p></p></div></div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'> </span><o:p></o:p></p></div></div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>I have developed a test case for llvm-link. However, I just figure out</span><o:p></o:p></p></div></div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>The test case was developed from licensed code. I cannot released</span><o:p></o:p></p></div></div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>to the public. Could you review my change without test case.</span><o:p></o:p></p></div></div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'> </span><o:p></o:p></p></div></div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Thanks,</span><o:p></o:p></p></div></div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'> </span><o:p></o:p></p></div></div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Yin<span class=apple-converted-space> </span></span><o:p></o:p></p></div></div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'> </span><o:p></o:p></p></div></div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'> </span><o:p></o:p></p></div></div><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><div><div><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span class=apple-converted-space><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> </span></span><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'><a href="mailto:mehdi.amini@apple.com"><span style='color:purple'>mehdi.amini@apple.com</span></a><span class=apple-converted-space> </span>[<a href="mailto:mehdi.amini@apple.com"><span style='color:purple'>mailto:mehdi.amini@apple.com</span></a>]<span class=apple-converted-space> </span><br><b>Sent:</b><span class=apple-converted-space> </span>Thursday, January 07, 2016 1:34 PM<br><b>To:</b><span class=apple-converted-space> </span>Yin Ma<br><b>Cc:</b><span class=apple-converted-space> </span>llvm-commits<br><b>Subject:</b><span class=apple-converted-space> </span>Re: Fix LTO unreferenced symbol bug due to alias renaming</span><o:p></o:p></p></div></div></div></div><div><div><p class=MsoNormal> <o:p></o:p></p></div></div><div><div><p class=MsoNormal>Hi Yin,<o:p></o:p></p></div></div><div><div><div><p class=MsoNormal> <o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal>Do you have a test-case for that?<o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal> <o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal>Thanks,<o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal> <o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal>Mehdi<o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal> <o:p></o:p></p></div></div><div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><div><div><p class=MsoNormal>On Jan 7, 2016, at 12:28 PM, Yin Ma via llvm-commits <<a href="mailto:llvm-commits@lists.llvm.org"><span style='color:purple'>llvm-commits@lists.llvm.org</span></a>> wrote:<o:p></o:p></p></div></div></div><div><div><p class=MsoNormal> <o:p></o:p></p></div></div><div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Hi,<span class=apple-converted-space> </span></span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> </span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>After 18f201b4db339145af8f340196943ef57b9c8d9f from Rafael was merged in, we are experiencing<span class=apple-converted-space> </span></span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>unreferenced symbol in several LTO programs. I analyzed the problem and find because 18f201 patch<span class=apple-converted-space> </span></span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>tries to discard the aliasee by renaming it. However, it will create a problem</span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>If the renaming happens for external functions, where non byte code may reference to the original</span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>name and cause unreferenced symbol at the end.</span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> </span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>So, we have to perform forceRenaming like before without 18f201 for those symbols in ShouldLink.</span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Like this to force those global symbols which may expose to other module to be the original name.</span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> </span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>diff --git a/lib/Linker/IRMover.cpp b/lib/Linker/IRMover.cpp</span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>index 16de0ec..68c3346 100644</span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>--- a/lib/Linker/IRMover.cpp</span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>+++ b/lib/Linker/IRMover.cpp</span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>@@ -1077,7 +1077,7 @@ Constant *IRLinker::linkGlobalValueProto(GlobalValue *SGV, bool ForAlias) {</span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> return nullptr;</span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> NewGV = copyGlobalValueProto(SGV, ShouldLink);</span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>- if (!ForAlias)</span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>+ if (ShouldLink || !ForAlias)</span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> forceRenaming(NewGV, SGV->getName());</span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> }</span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> if (ShouldLink || ForAlias) {</span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> </span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Please review.</span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> </span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Thanks,</span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> </span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>Yin<span class=apple-converted-space> </span></span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> </span><o:p></o:p></p></div></div></div><div><div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> </span><o:p></o:p></p></div></div></div><div><div><p class=MsoNormal><i.diff><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif'>_______________________________________________<br>llvm-commits mailing list<br></span><a href="mailto:llvm-commits@lists.llvm.org"><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:#954F72'>llvm-commits@lists.llvm.org</span></a><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif'><br></span><a href="http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits"><span style='font-size:9.0pt;font-family:"Helvetica",sans-serif;color:#954F72'>http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-commits</span></a><o:p></o:p></p></div></div></div></blockquote></div></div></div></blockquote></div></div></div></blockquote></div><p class=MsoNormal><o:p> </o:p></p></div></div></body></html>