<html>
<head>
<base href="http://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - MS ABI: Derived class has fewer vftable entries than base"
href="http://llvm.org/bugs/show_bug.cgi?id=21073">21073</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>MS ABI: Derived class has fewer vftable entries than base
</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 A *f();
};
struct __declspec(dllexport) B : virtual A {
virtual B *f();
};
struct __declspec(dllexport) C : virtual A, virtual B {};
--- different.cpp_clang.obj.dump 2014-09-25 13:24:59.240925700 -0700
+++ different.cpp_vs.obj.dump 2014-09-25 13:24:59.286925700 -0700
@@ -1,7 +1,8 @@
const A::`vftable'[0]: public: virtual struct A * __thiscall A::f(void)
const B::`vftable'[0]: public: struct A * __thiscall B::f(void)
const B::`vftable'[4]: public: virtual struct B * __thiscall B::f(void)
-const C::`vftable'[0]: [thunk]:public: virtual struct A * __thiscall
B::f`adjustor{4294967288}' (void)
+const C::`vftable'[0]: [thunk]:public: virtual struct B * __thiscall
B::f`adjustor{4294967288}' (void)
+const C::`vftable'[4]: [thunk]:public: virtual struct B * __thiscall
B::f`adjustor{4294967288}' (void)
const B::`vbtable'[0]: 0
const B::`vbtable'[4]: 4
const C::`vbtable'{for `C'}[0]: 0
We don't give C fewer vftable slots than B.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>