[cfe-dev] intermittent lit failure: clang/test/CXX/temp/temp.arg/temp.arg.template/p3-2a.cpp

[Saar Raz via cfe-dev]

Hey,
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.
I'll push a fix as soon as I can.
Thanks!

On Fri, Apr 3, 2020, 10:23 PM Johnson, Troy <troy.johnson at hpe.com> wrote:

> Has anyone tried to reproduce this yet?
>
> Thanks,
> Troy
> ------------------------------
> *From:* Richard Smith <richard at metafoo.co.uk>
> *Sent:* Tuesday, March 24, 2020 5:46 PM
> *To:* Johnson, Troy <troy.johnson at hpe.com>; Saar Raz <saar at raz.email>
> *Cc:* cfe-dev at lists.llvm.org <cfe-dev at lists.llvm.org>
> *Subject:* Re: [cfe-dev] intermittent lit failure:
> clang/test/CXX/temp/temp.arg/temp.arg.template/p3-2a.cpp
>
> +Saar for all things concepts.
>
> On Tue, 24 Mar 2020 at 13:23, Johnson, Troy via cfe-dev <
> cfe-dev at lists.llvm.org> wrote:
>
> 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:
>
> void StmtProfiler::VisitConceptSpecializationExpr(
>                                            const ConceptSpecializationExpr
> *S) {
>   VisitExpr(S);
>   VisitDecl(S->getFoundDecl());
>   VisitTemplateArguments(S->getTemplateArgsAsWritten()->getTemplateArgs(),
>                          S->getTemplateArgsAsWritten()->NumTemplateArgs);
> }
>
> The S->getTemplateArgsAsWritten() call returns null.
>
> I have not been able to determine why the behavior is intermittent.  Is
> there someone more familiar with this code who has an idea?
>
> -Troy
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>
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