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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Potential leaks reported on `new`ed pointer escaped via reinterpret_cast + bit ops"
href="https://bugs.llvm.org/show_bug.cgi?id=34198">34198</a>
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<th>Summary</th>
<td>Potential leaks reported on `new`ed pointer escaped via reinterpret_cast + bit ops
</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>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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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
</td>
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<th>Assignee</th>
<td>kremenek@apple.com
</td>
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<th>Reporter</th>
<td>george.burgess.iv@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Test case:
using uintptr_t = unsigned long long;
uintptr_t bar;
void alloc() {
bar = reinterpret_cast<uintptr_t>(new int) | 0;
}
$ clang --analyze /tmp/tc.cpp -fno-exceptions
/tmp/tc.cpp:4:7: warning: Potential memory leak
bar = reinterpret_cast<uintptr_t>(new int) | 0;
~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
$
However, if the test-case is changed to:
using uintptr_t = unsigned long long;
uintptr_t bar;
void alloc() {
bar = reinterpret_cast<uintptr_t>(new int);
bar |= 0;
}
This "potential leak" warning doesn't appear, regardless of the value that
`bar` is `or`ed with.</pre>
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