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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 --- - [-cxx-abi microsoft] Wrong layout due to mistakenly injected vtorDisp"
href="http://llvm.org/bugs/show_bug.cgi?id=16406">16406</a>
</td>
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<tr>
<th>Summary</th>
<td>[-cxx-abi microsoft] Wrong layout due to mistakenly injected vtorDisp
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</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>
<tr>
<th>Component</th>
<td>C++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>timurrrr@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>=== vtordisp_layout.cpp ===
class A {
virtual void f();
};
class B : virtual A {
virtual void f();
};
class C : virtual B {};
extern "C" int printf(const char *fmt, ...);
int main() {
printf("sizeof(C) = %lu\n", sizeof(C));
}
===========================
As of r184536,
$ clang -cc1 -fno-rtti -fdump-record-layouts -cxx-abi microsoft
-triple=i386-pc-win32 -emit-llvm-only -o - vtordisp_layout.cpp
prints out
*** Dumping AST Record Layout
0 | class B
0 | (B vbtable pointer)
4 | (vtordisp for vbase A)
8 | class A (virtual base)
8 | (A vftable pointer)
| [sizeof=12, dsize=12, align=4
| nvsize=4, nvalign=4]
*** Dumping AST Record Layout
0 | class C
0 | (C vbtable pointer)
4 | (vtordisp for vbase A)
8 | class A (virtual base)
8 | (A vftable pointer)
12 | class B (virtual base)
12 | (B vbtable pointer)
| [sizeof=16, dsize=16, align=4
| nvsize=4, nvalign=4]
There should not be vtordisp in B, nor should it be in C.
sizeof(B) should be 8, sizeof(C) should be 12.</pre>
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