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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 --- - MSVC: Segfault witch cleanupret to catchswitch"
href="https://llvm.org/bugs/show_bug.cgi?id=25859">25859</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>MSVC: Segfault witch cleanupret to catchswitch
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>alex@crichton.co
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The following IR is reduced greatly from a Rust program, and I'm not 100% sure
if it's legal. Currently when compiled, however, it will segfault. When the
call to GetProcessHeap is omitted it will not segfault oddly enough.
target triple = "i686-pc-windows-msvc"
declare i32 @_except_handler3(...)
declare x86_stdcallcc void @RaiseException(i32, i32, i32, i64*)
declare x86_stdcallcc i8* @GetProcessHeap()
define i32 @main() personality i32 (...)* @_except_handler3 {
top:
invoke x86_stdcallcc void @RaiseException(i32 5395284, i32 0, i32 0, i64*
null)
to label %impossible unwind label %cleanup
impossible:
unreachable
cleanup:
%cleanuppad = cleanuppad within none []
%t = tail call x86_stdcallcc i8* @GetProcessHeap()
cleanupret from %cleanuppad unwind label %catchswitch
catchswitch:
%cs = catchswitch within none [label %catchpad] unwind to caller
catchpad:
%cp = catchpad within %cs [i8* bitcast (i32 ()* @filter to i8*)]
catchret from %cp to label %exit
exit:
ret i32 101
}
define internal i32 @filter() {
entry-block:
ret i32 1
}</pre>
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