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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Null dereference when generating module summary index with alias-to-ifunc"
href="https://bugs.llvm.org/show_bug.cgi?id=46340">46340</a>
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<th>Summary</th>
<td>Null dereference when generating module summary index with alias-to-ifunc
</td>
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<th>Product</th>
<td>libraries
</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>Windows NT
</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>Global Analyses
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>itay.bookstein@nextsilicon.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Compiling the following piece of code works fine, but crashes with a
null-dereference segfault when passing -flto:
static void foo_impl(void) {}
static void *foo_ifunc(void) { return &foo_impl; }
extern void foo(void) __attribute__((ifunc("foo_ifunc")));
extern __typeof(foo) foo2 __attribute__((alias("foo")));
The null-dereference is due to GlobalAlias::getBaseObject returning nullptr
when the aliasee is a GlobalIFunc, and it happens specifically in
ModuleSummaryAnalysis.cpp function computeAliasSummary.</pre>
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