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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Feature request: warn on possibly-infinite loops without sequence points"
href="http://llvm.org/bugs/show_bug.cgi?id=15527">15527</a>
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<th>Summary</th>
<td>Feature request: warn on possibly-infinite loops without sequence points
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Static Analyzer
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<th>Assignee</th>
<td>kremenek@apple.com
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<th>Reporter</th>
<td>juli@clockworksquid.com
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>It is common in threaded code to see things like "while (foo->bar) continue;"
where bar is a field of the struct pointed to by foo which is expected to be
changed in another thread (or on signal, or ...) Usually, correct
implementations would have an unlock and a relock (or ideally a block on a
condition variable), thus putting a sequence point within the loop and
requiring the compiler to reload the value of foo->bar over and over again, or
bar or foo may be declared volatile, however occasionally implementations that
are so simplistic do occur.
I would like to see the static analyzer detect these conditions, namely by
detecting that a loop conditional will only be checked once, and then will
either proceed or will reliably enter into an infinite loop.</pre>
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</p>
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