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<body><span class="vcard"><a class="email" href="mailto:JCTremoulet@gmail.com" title="Joseph Tremoulet <JCTremoulet@gmail.com>"> <span class="fn">Joseph Tremoulet</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - WinEHPrepare fails on __try / __finally inside __try / __except"
href="https://llvm.org/bugs/show_bug.cgi?id=24773">bug 24773</a>
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<table border="1" cellspacing="0" cellpadding="8">
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
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<td style="text-align:right;">CC</td>
<td>
</td>
<td>JCTremoulet@gmail.com
</td>
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<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>INVALID
</td>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - WinEHPrepare fails on __try / __finally inside __try / __except"
href="https://llvm.org/bugs/show_bug.cgi?id=24773#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - WinEHPrepare fails on __try / __finally inside __try / __except"
href="https://llvm.org/bugs/show_bug.cgi?id=24773">bug 24773</a>
from <span class="vcard"><a class="email" href="mailto:JCTremoulet@gmail.com" title="Joseph Tremoulet <JCTremoulet@gmail.com>"> <span class="fn">Joseph Tremoulet</span></a>
</span></b>
<pre><span class="quote">> First, having a single-BB catch funclet seems to confuse WinEHPrepare. It ends up cloning
> the subsequent blocks and transforms the "implausible" ret as unreachable.</span >
WinEHPrepare is working as expected here given its input, the invoke in the
__finally has an unwind edge directly to the catchpad for the __except, which
indicates the __except being nested inside the __finally (contrary to the
actual nesting at source). To reflect the correct nesting, the IR should be
generated with the invoke's unwind edge targeting a cleanupendpad for the
__finally. Clang was updated to use cleanupendpad in r247349.
<span class="quote">> Second, if I run -O1 on the IR, demotion fails like this:</span >
This failure is currently expected for the given input; mismatched nesting can
be legal IR but requires cloning of whole funclets which is NYI.</pre>
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