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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Dead symbols leak in program state in some cases"
href="http://llvm.org/bugs/show_bug.cgi?id=20563">20563</a>
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<th>Summary</th>
<td>Dead symbols leak in program state in some cases
</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>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</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
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<th>Reporter</th>
<td>a.sidorin@samsung.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>In some cases SymbolRegionValues related to a region remain alive after binding
a new value to this region even if there is no any references to this symbol.
Problem exists in release_34 and for trunk branch (r214868).
Test sample:
void testStoreConstraint(int i) {
if (i < 10) // create a new symbol related to a region
i = 0; // bind a new value to this region
else
i = 1; // bind a new value to this region
(void)i; // but symbol is still alive here in constraints
}
and one of ProgramStates in the end of analysis, before the final
PostStmtPurgeDeadSymbols node (the second state is almost the same):
Store (direct and default bindings), 0x6284fe8 :
(i,0,direct) : 1 S32b
Expressions:
(0x6283f50,0x6278190) i : &i
Ranges of symbol values:
reg_$0<i> : { [10, 2147483647] }
I'll try to investigate this behaviour to get more information. If you have any
ideas please share them.</pre>
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</p>
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