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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - SimplifyCFG may drop debugloc on invokes"
href="https://bugs.llvm.org/show_bug.cgi?id=39807">39807</a>
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</tr>
<tr>
<th>Summary</th>
<td>SimplifyCFG may drop debugloc on invokes
</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>Linux
</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>
<tr>
<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nikita.ppv@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Running the following LLVM IR under opt -S -simplifycfg results in a verifier
error:
inlinable function call in a function with debug info must have a !dbg location
invoke void @inlinable()
to label %success unwind label %failure
This issue affects Rust, ref <a href="https://github.com/rust-lang/rust/issues/56265">https://github.com/rust-lang/rust/issues/56265</a>.
Suspected cause is <a href="https://reviews.llvm.org/D53390">https://reviews.llvm.org/D53390</a>, but I haven't verified this
yet.
-----
declare void @personality()
define void @test(i1 %b) personality void()* @personality !dbg !1 {
br i1 %b, label %if, label %else
if:
invoke void @inlinable()
to label %success unwind label %failure, !dbg !2
else:
invoke void @inlinable()
to label %success unwind label %failure, !dbg !2
success:
ret void
failure:
landingpad {}
cleanup
ret void
}
define internal void @inlinable() !dbg !7 {
ret void
}
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!4, !5, !6}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, runtimeVersion: 0,
file: !3)
!1 = distinct !DISubprogram(name: "test", unit: !0)
!2 = !DILocation(line: 2, scope: !1)
!3 = !DIFile(filename: "foo", directory: ".")
!4 = !{i32 2, !"Dwarf Version", i32 4}
!5 = !{i32 2, !"Debug Info Version", i32 3}
!6 = !{i32 1, !"wchar_size", i32 4}
!7 = distinct !DISubprogram(name: "inlinable", unit: !0)</pre>
</div>
</p>
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