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<body><span class="vcard"><a class="email" href="mailto:rnk@google.com" title="Reid Kleckner <rnk@google.com>"> <span class="fn">Reid Kleckner</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - clang-cl producing crashing executable due to exception handling"
href="https://llvm.org/bugs/show_bug.cgi?id=25533">bug 25533</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">CC</td>
<td>
</td>
<td>rnk@google.com
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - clang-cl producing crashing executable due to exception handling"
href="https://llvm.org/bugs/show_bug.cgi?id=25533#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - clang-cl producing crashing executable due to exception handling"
href="https://llvm.org/bugs/show_bug.cgi?id=25533">bug 25533</a>
from <span class="vcard"><a class="email" href="mailto:rnk@google.com" title="Reid Kleckner <rnk@google.com>"> <span class="fn">Reid Kleckner</span></a>
</span></b>
<pre>Thanks for the report. I broke this in r253059.
What happened was we had a function that:
- Used no callee-saved registers (because -O0)
- Used the C++ personality function
- Did not have any EH pads
We have logic that allocates an UnwindHelp fixed stack object and initializes
it to -2. That logic was checking for the MSVC C++ EH personality, and it was
forgetting to handle the case that there were no existing fixed stack objects.
In that case, it used offset 0 for UnwindHelp, which is the offset of the
return address.
I fixed this with two changes in r253245:
- If there are no fixed stack objects, use offset -SlotSize, which is after the
return address
- Don't allocate UnwindHelp at all if there are no funclets</pre>
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