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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Crash after explicit call to a base constructor with virtual base"
href="https://bugs.llvm.org/show_bug.cgi?id=42756">42756</a>
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<th>Summary</th>
<td>Crash after explicit call to a base constructor with virtual base
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>8.0
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>securesneakers@gmail.com
</td>
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=22289" name="attach_22289" title="Minimal example that reproduces the issue">attachment 22289</a> <a href="attachment.cgi?id=22289&action=edit" title="Minimal example that reproduces the issue">[details]</a></span>
Minimal example that reproduces the issue
The code below crashes Windows:
struct interface { };
struct base1_if : virtual interface { };
struct base2_if : virtual interface { };
struct base_if : base1_if, base2_if { };
struct derived : base_if {
derived()
: base_if()
{ }
};
int main() { derived d; }
Command line:
$ clang-cl -v
clang version 8.0.0 (tags/RELEASE_800/final)
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: C:\Program Files\LLVM\bin
$ clang-cl main.cpp
$ main.exe
Few notes:
- Removing explicit call to "base_if" avoids the issue.
- Generated assembly contains "memset(addr, 0, r8,0FFFFFFFFFFFFFFF8h)":
00007FF7482310A9 mov r8,0FFFFFFFFFFFFFFF8h
00007FF7482310B0 mov dword ptr [rsp+2Ch],eax
00007FF7482310B4 call memset (07FF748232FE0h)</pre>
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