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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - reinterpret_cast throws off static analyzer"
href="https://llvm.org/bugs/show_bug.cgi?id=28344">28344</a>
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<th>Summary</th>
<td>reinterpret_cast throws off static analyzer
</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>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Static Analyzer
</td>
</tr>
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<th>Assignee</th>
<td>kremenek@apple.com
</td>
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<th>Reporter</th>
<td>eric.huhtala@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>assignment via reinterpret_cast seems to throw off all analysis of that
variable.
Example Code:
extern unsigned *b;
unsigned f() {
// if I reassign b via reinterpret_cast, I get "Undefined or garbage value
returned to caller" at g(dummy)
// if I don't, I get no warning
unsigned *b = reinterpret_cast<unsigned*>(4);
unsigned char a = (*b == 0) ? *b : 0;
unsigned dummy;
if (a == 0) dummy = 0;
return dummy;
}</pre>
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