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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 - False positive when analyzing boost/algorithm"
href="https://bugs.llvm.org/show_bug.cgi?id=44247">44247</a>
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<th>Summary</th>
<td>False positive when analyzing boost/algorithm
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<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>
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<th>Reporter</th>
<td>mathstuf+llvmbugzilla@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dcoughlin@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>I got this report via clang-tidy in a Boost header:
/builds/ben.boeckel/smtk/build/../smtk/attribute/Attribute.cxx:234:3: note:
Calling 'split<std::vector<std::__cxx11::basic_string<char>,
std::allocator<std::__cxx11::basic_string<char> > >, const
std::__cxx11::basic_string<char> &,
boost::algorithm::detail::is_any_ofF<char>>'
boost::split(tree, path, boost::is_any_of(seps));
^
/root/misc/root/smtk-deps/include/boost/algorithm/string/split.hpp:161:17:
note: Calling 'token_finder<boost::algorithm::detail::is_any_ofF<char>>'
::boost::algorithm::token_finder( Pred, eCompress ) );
^
/root/misc/root/smtk-deps/include/boost/algorithm/string/finder.hpp:219:55:
note: Calling copy constructor for 'is_any_ofF<char>'
return detail::token_finderF<PredicateT>( Pred, eCompress );
^
/root/misc/root/smtk-deps/include/boost/algorithm/string/detail/classification.hpp:114:21:
note: Taking false branch
if(use_fixed_storage(m_Size))
^
/root/misc/root/smtk-deps/include/boost/algorithm/string/detail/classification.hpp:123:44:
note: Memory is allocated
m_Storage.m_dynSet=new set_value_type[m_Size];
^
/root/misc/root/smtk-deps/include/boost/algorithm/string/finder.hpp:219:55:
note: Returning from copy constructor for 'is_any_ofF<char>'
return detail::token_finderF<PredicateT>( Pred, eCompress );
^
/root/misc/root/smtk-deps/include/boost/algorithm/string/finder.hpp:219:55:
note: Calling '~is_any_ofF'
/root/misc/root/smtk-deps/include/boost/algorithm/string/detail/classification.hpp:135:51:
note: Left side of '&&' is false
if(!use_fixed_storage(m_Size) && m_Storage.m_dynSet!=0)
^
/root/misc/root/smtk-deps/include/boost/algorithm/string/detail/classification.hpp:139:17:
note: Potential memory leak
}
^
However, I think this is a false positive. It is assuming that
use_fixed_storage(m_Size) is both false (line 114) and later that
!use_fixed_storage(m_Size) is false (line 135). Marshall in
<a href="https://github.com/boostorg/algorithm/issues/63">https://github.com/boostorg/algorithm/issues/63</a> says it appears like a false
positive. Is this a bug in clang-analyzer or is it actually correct here
somehow?</pre>
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