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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 --- - MicrosoftRecordLayoutBuilder yields wrong info on the presence of vfptr"
href="http://llvm.org/bugs/show_bug.cgi?id=17845">17845</a>
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<th>Summary</th>
<td>MicrosoftRecordLayoutBuilder yields wrong info on the presence of vfptr
</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>
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<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>C++
</td>
</tr>
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<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>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Steps to repro as of r194205:
1) Apply the following diff:
----------------------------------------------
Index: lib/AST/RecordLayoutBuilder.cpp
===================================================================
--- lib/AST/RecordLayoutBuilder.cpp (revision 194256)
+++ lib/AST/RecordLayoutBuilder.cpp (working copy)
@@ -2904,6 +2904,9 @@
bool HasOwnVFPtr = Layout.hasOwnVFPtr();
bool HasOwnVBPtr = Layout.hasOwnVBPtr();
+ if (IndentLevel == 1)
+ OS << (Layout.hasVFPtr() ? "-- has vfptr --\n" : "-- doesn't have vfptr
--\n");
+
// Vtable pointer.
if (RD->isDynamicClass() && !PrimaryBase && !isMsLayout(RD)) {
PrintOffset(OS, Offset, IndentLevel);
----------------------------------------------
2) Dump the AST layout for the following code:
----------------------------------------------
class X { virtual void f(); int x; };
class A : virtual X { int a; };
----------------------------------------------
I get this:
----------------------------------------------
*** Dumping AST Record Layout
0 | class A
-- doesn't have vfptr --
0 | (A vbtable pointer)
4 | int a
8 | class X (virtual base)
8 | (X vftable pointer)
12 | int x
----------------------------------------------
It's pretty clear that the result of Layout.hasVFPtr() is wrong.</pre>
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