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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - VFTable larger than needed for multiple inheritance hierarchy"
href="http://llvm.org/bugs/show_bug.cgi?id=20444">20444</a>
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<th>Summary</th>
<td>VFTable larger than needed for multiple inheritance hierarchy
</td>
</tr>
<tr>
<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>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>david.majnemer@gmail.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>struct A {
virtual A *f() { return 0; }
};
struct B {
virtual B *f() { return 0; }
};
struct C : A, B {
virtual C *f() { return 0; }
};
A a;
B b;
C c;
B *get_c() { return &c; }
int main() {
get_c()->f();
}
We generate the following:
"??_7C@@6BA@@@":
.long "?f@C@@UAEPAU1@XZ"
.long "?f@C@@UAEPAU1@XZ"
Note that the VFTable has the same entry twice in it. This can be very
problematic if we have RTTI because the largest VFTable might not get picked.</pre>
</div>
</p>
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