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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 --- - MS ABI: Extra vtordisp inserted"
href="http://llvm.org/bugs/show_bug.cgi?id=21046">21046</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>MS ABI: Extra vtordisp inserted
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<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>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>consider:
struct __declspec(dllexport) A {
virtual void f();
};
struct __declspec(dllexport) B : virtual A {
virtual void f() = 0;
B() {}
};
struct __declspec(dllexport) C : virtual B { };
we get the following:
--- different.cpp_clang.obj.dump 2014-09-23 15:09:04.840112200 -0700
+++ different.cpp_vs.obj.dump 2014-09-23 15:09:04.900112200 -0700
@@ -2,9 +2,9 @@
const B::`vftable'[0]: __purecall
const C::`vftable'[0]: __purecall
const B::`vbtable'[0]: 0
-const B::`vbtable'[4]: 8
+const B::`vbtable'[4]: 4
const C::`vbtable'{for `C'}[0]: 0
-const C::`vbtable'{for `C'}[4]: 8
-const C::`vbtable'{for `C'}[8]: 12
+const C::`vbtable'{for `C'}[4]: 4
+const C::`vbtable'{for `C'}[8]: 8
const C::`vbtable'{for `B'}[0]: 0
const C::`vbtable'{for `B'}[4]: -4
It appears that we thinkg B needs a vtordisp even though it overrides a method
in A with a pure virtual function.</pre>
</div>
</p>
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