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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW " title="NEW --- - [ms] virtual member pointer call gets miscompiled" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D23878&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=Uos-gcQxGGQ9sh0N9egQfo4DwC2Xav8KMVSqjmL3af8&s=RXFFbBOy7Gn7cJgwzL5nPuufsEJiH-005e_JpogMDt0&e=">23878</a>
</td>
</tr>
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<th>Summary</th>
<td>[ms] virtual member pointer call gets miscompiled
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</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>LLVM Codegen
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>nicolasweber@gmx.de
</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:
C:\src\chrome\src\out\Debug>type repro.cc
struct Channel { virtual void Connect() = 0; };
struct SupportsAttachmentBrokering { virtual void GetAttachmentBroker() = 0; };
struct ChannelReader : virtual public SupportsAttachmentBrokering {
void GetAttachmentBroker() override {}
};
struct ChannelWin : public Channel, public ChannelReader {
void Connect() override {
void (ChannelWin::*ptr)() = &ChannelWin::OnIOCompleted;
(this->*ptr)(); // crashes
}
virtual void OnIOCompleted() {}
};
int main() {
ChannelWin channel;
channel.Connect();
}
This program runs fine when build with cl.exe, but crashes when built with
clang-cl.exe:
C:\src\chrome\src\out\Debug>cl repro.cc /Feasdf && asdf
Microsoft (R) C/C++ Optimizing Compiler Version 18.00.31101 for x86
Copyright (C) Microsoft Corporation. All rights reserved.
repro.cc
Microsoft (R) Incremental Linker Version 12.00.31101.0
Copyright (C) Microsoft Corporation. All rights reserved.
/out:asdf.exe
repro.obj
C:\src\chrome\src\out\Debug>"..\..\third_party/llvm-build/Release+Asserts/bin/clang-cl"
-m32 repro.cc /Feasdf.exe && asdf
# ^ This makes a "asdf.ese has stopped working" dialog appear</pre>
</div>
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