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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ClangCl: windows structured exception handling doesn't work"
href="https://bugs.llvm.org/show_bug.cgi?id=44372">44372</a>
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<th>Summary</th>
<td>ClangCl: windows structured exception handling doesn't work
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>9.0
</td>
</tr>
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<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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Frontend
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>andrii.riabushenko@barclays.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
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<p>
<div>
<pre>Example compiles with Clang-Cl from official LLVM 9.0 64bit windows binaries
but crashes at the runtime.
Example taken from
<a href="https://docs.microsoft.com/en-us/cpp/cpp/try-except-statement?view=vs-2019">https://docs.microsoft.com/en-us/cpp/cpp/try-except-statement?view=vs-2019</a>.
#include <stdio.h>
#include <windows.h>
#include <excpt.h>
int filter(unsigned int code, struct _EXCEPTION_POINTERS *ep)
{
puts("in filter.");
if (code == EXCEPTION_ACCESS_VIOLATION)
{
puts("caught AV as expected.");
return EXCEPTION_EXECUTE_HANDLER;
}
else
{
puts("didn't catch AV, unexpected.");
return EXCEPTION_CONTINUE_SEARCH;
};
}
int main()
{
int* p = 0x00000000; // pointer to NULL
puts("hello");
__try
{
puts("in try");
__try
{
puts("in try");
*p = 13; // causes an access violation exception;
}
__finally
{
puts("in finally");
}
}
__except(filter(GetExceptionCode(), GetExceptionInformation()))
{
puts("in except");
}
puts("world");
}
The expected output:
hello
in try
in try
in filter.
caught AV as expected.
in finally
in except
world
The actual output:
hello
in try
in try
(CRASH)</pre>
</div>
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