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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 - Static analyzer isa and dyn_cast mismatch for the same pointer"
href="https://bugs.llvm.org/show_bug.cgi?id=43536">43536</a>
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</tr>
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<th>Summary</th>
<td>Static analyzer isa and dyn_cast mismatch for the same pointer
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Static Analyzer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dcoughlin@apple.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>llvm-dev@redking.me.uk
</td>
</tr>
<tr>
<th>CC</th>
<td>dcoughlin@apple.com, llvm-bugs@lists.llvm.org, noqnoqneo@gmail.com
</td>
</tr></table>
<p>
<div>
<pre><a href="https://llvm.org/reports/scan-build/report-LoopCacheAnalysis.cpp-getLastCoefficient-5-1.html#EndPath">https://llvm.org/reports/scan-build/report-LoopCacheAnalysis.cpp-getLastCoefficient-5-1.html#EndPath</a>
const SCEV *IndexedReference::getLastCoefficient() const {
const SCEV *LastSubscript = getLastSubscript();
assert(isa<SCEVAddRecExpr>(LastSubscript) &&
"Expecting a SCEV add recurrence expression");
const SCEVAddRecExpr *AR = dyn_cast<SCEVAddRecExpr>(LastSubscript);
return AR->getStepRecurrence(SE);
}
The analyzer assumes that LastSubscript is a SCEVAddRecExpr in the assert but
in the following line assumes that it isn't a SCEVAddRecExpr and then warns
about a null dereference.</pre>
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