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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang goes into an endless loop while trying to produce diagnostics"
href="https://bugs.llvm.org/show_bug.cgi?id=50797">50797</a>
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<th>Summary</th>
<td>clang goes into an endless loop while trying to produce diagnostics
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>12.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>jeroen.dobbelaere@synopsys.com
</td>
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>During a creduce session of a csmith triggered issue, I stumbled upon this
unrelated, but still annoying bug:
For the provided program, clang goes into an endless loop.
Based on the backtrace, it might be related to
TransformTypos::RecursiveTransformLoop ; At least, that one is consistently
showing up.
#0 0x0000000004b111e0 in clang::TreeTransform<(anonymous
namespace)::TransformTypos>::TransformCXXDependentScopeMemberExpr(clang::CXXDependentScopeMemberExpr*)
()
#1 0x0000000004b10898 in clang::TreeTransform<(anonymous
namespace)::TransformTypos>::TransformBinaryOperator(clang::BinaryOperator*) ()
#2 0x0000000004ad9d63 in (anonymous
namespace)::TransformTypos::RecursiveTransformLoop(clang::Expr*, bool&) ()
#3 0x0000000004ada6be in clang::Sema::CorrectDelayedTyposInExpr(clang::Expr*,
clang::VarDecl*, bool, llvm::function_ref<clang::ActionResult<clang::Expr*,
true> (clang::Expr*)>) [clone .localalias.8] ()
#4 0x00000000046bfddd in
clang::Parser::ParseParenExpression(clang::Parser::ParenParseOption&, bool,
bool, clang::OpaquePtr<clang::QualType>&, clang::SourceLocation&) [clone .lo
<a href="https://www.godbolt.org/z/5Mxae6fWY">https://www.godbolt.org/z/5Mxae6fWY</a>
Based on godbolt's feedback, this was introduced for llvm-12 and is still
present in trunc
It also only happens when in 'C' mode, C++ mode does not get into a loop.</pre>
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