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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [-cxx-abi microsoft] vtordisps for virtual base should be placed before aligning virtual bases"
href="http://llvm.org/bugs/show_bug.cgi?id=18277">18277</a>
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</tr>
<tr>
<th>Summary</th>
<td>[-cxx-abi microsoft] vtordisps for virtual base should be placed before aligning virtual bases
</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>
<tr>
<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>
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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, whunt@google.com
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>$ cat t.cpp
struct A {
virtual ~A();
long long ll;
};
struct B : A {
virtual ~B();
virtual void foo();
int b;
};
struct C : virtual B {
virtual ~C();
virtual void foo();
};
extern "C" int printf(const char *, ...);
int main() {
printf("sizeof(C): %d\n", sizeof(C));
}
$ cl -nologo t.cpp -GR- && ./t.exe
t.cpp
sizeof(C): 32
$ clang-cl t.cpp -GR- && ./t.exe
sizeof(C): 40
*** Dumping AST Record Layout
0 | struct C
0 | (C vbtable pointer)
... This padding here is unnecessary, and I assume that MSVC doesn't add it
12 | (vtordisp for vbase B)
16 | struct B (virtual base)
16 | struct A (primary base)
16 | (A vftable pointer)
24 | long long ll
32 | int b
| [sizeof=40, align=8
| nvsize=4, nvalign=4]</pre>
</div>
</p>
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