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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 thunk generated method inherited from virtual base"
href="http://llvm.org/bugs/show_bug.cgi?id=19397">19397</a>
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<th>Summary</th>
<td>MS ABI: Extra vtordisp thunk generated method inherited from virtual base
</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>
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<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>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>rnk@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu, timurrrr@google.com
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>In this example, we generate a thunk for g and MSVC doesn't. This may not be a
correctness problem, but it shows up when comparing vftables.
$ cat t.cpp
struct A {
A() {}
virtual void f() = 0;
virtual void g();
};
struct B : A {
B() {}
virtual void g();
};
struct C : virtual B {
C() {}
virtual void f();
};
C c;
$ dumpbin /symbols t1.obj | grep ?g@
025 00000000 SECT6 notype () External | ?g@B@@$4PPPPPPPM@A@AEXXZ
([thunk]:public: virtual void __thiscall B::g`vtordisp{4294967292,0}' (void))
026 00000000 UNDEF notype External | ?g@B@@UAEXXZ (public: virtual
void __thiscall B::g(void))
02A 00000000 UNDEF notype External | ?g@A@@UAEXXZ (public: virtual
void __thiscall A::g(void))
$ dumpbin /symbols t2.obj | grep ?g@
012 00000000 UNDEF notype () External | ?g@A@@UAEXXZ (public: virtual
void __thiscall A::g(void))
014 00000000 UNDEF notype () External | ?g@B@@UAEXXZ (public: virtual
void __thiscall B::g(void))</pre>
</div>
</p>
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