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The accessor can return null intermittently? Why?</div>
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-Troy<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Saar Raz <saar@raz.email><br>
<b>Sent:</b> Friday, April 3, 2020 2:48 PM<br>
<b>To:</b> Johnson, Troy <troy.johnson@hpe.com><br>
<b>Cc:</b> Richard Smith <richard@metafoo.co.uk>; Clang Dev <cfe-dev@lists.llvm.org><br>
<b>Subject:</b> Re: [cfe-dev] intermittent lit failure: clang/test/CXX/temp/temp.arg/temp.arg.template/p3-2a.cpp</font>
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<div dir="auto">Hey,
<div dir="auto">Didn't reproduce yet but I know how to fix the issue. That accessor can return null and there should be a null check there. </div>
<div dir="auto">I'll push a fix as soon as I can.</div>
<div dir="auto">Thanks! </div>
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<div dir="ltr" class="x_gmail_attr">On Fri, Apr 3, 2020, 10:23 PM Johnson, Troy <<a href="mailto:troy.johnson@hpe.com">troy.johnson@hpe.com</a>> wrote:<br>
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Has anyone tried to reproduce this yet?<br>
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Thanks,</div>
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Troy<br>
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<div id="x_m_-202014215694383247divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Richard Smith <<a href="mailto:richard@metafoo.co.uk" target="_blank" rel="noreferrer">richard@metafoo.co.uk</a>><br>
<b>Sent:</b> Tuesday, March 24, 2020 5:46 PM<br>
<b>To:</b> Johnson, Troy <<a href="mailto:troy.johnson@hpe.com" target="_blank" rel="noreferrer">troy.johnson@hpe.com</a>>; Saar Raz <saar@raz.email><br>
<b>Cc:</b> <a href="mailto:cfe-dev@lists.llvm.org" target="_blank" rel="noreferrer">
cfe-dev@lists.llvm.org</a> <<a href="mailto:cfe-dev@lists.llvm.org" target="_blank" rel="noreferrer">cfe-dev@lists.llvm.org</a>><br>
<b>Subject:</b> Re: [cfe-dev] intermittent lit failure: clang/test/CXX/temp/temp.arg/temp.arg.template/p3-2a.cpp</font>
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<div dir="ltr">+Saar for all things concepts.<br>
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<div dir="ltr">On Tue, 24 Mar 2020 at 13:23, Johnson, Troy via cfe-dev <<a href="mailto:cfe-dev@lists.llvm.org" target="_blank" rel="noreferrer">cfe-dev@lists.llvm.org</a>> wrote:<br>
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The test fails about 1 in 10 or 20 runs when I execute it via llvm-lit repeatedly in a shell loop. It encounters a null pointer dereference in this code in clang/lib/AST/StmtProfile.cpp:<br>
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<span>void StmtProfiler::VisitConceptSpecializationExpr(<br>
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<div> const ConceptSpecializationExpr *S) {<br>
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<div> VisitExpr(S);<br>
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<div> VisitDecl(S->getFoundDecl());<br>
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<div> VisitTemplateArguments(S->getTemplateArgsAsWritten()->getTemplateArgs(),<br>
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<div> S->getTemplateArgsAsWritten()->NumTemplateArgs);<br>
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<span>}</span></div>
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The S->getTemplateArgsAsWritten() call returns null.</div>
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I have not been able to determine why the behavior is intermittent. Is there someone more familiar with this code who has an idea?<br>
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-Troy<br>
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