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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Assertion failed: (T == dwarf::DW_TAG_typedef || ...), function isUnsignedDIType, file lib/CodeGen/AsmPrinter/DwarfUnit.cpp, line 592"
href="http://llvm.org/bugs/show_bug.cgi?id=22309">22309</a>
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<th>Summary</th>
<td>Assertion failed: (T == dwarf::DW_TAG_typedef || ...), function isUnsignedDIType, file lib/CodeGen/AsmPrinter/DwarfUnit.cpp, line 592
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dimitry@andric.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
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<pre>I encountered this assertion during compilation of a few FreeBSD kernel sources
with clang trunk r226904:
Assertion failed: (T == dwarf::DW_TAG_typedef || T == dwarf::DW_TAG_const_type
|| T == dwarf::DW_TAG_volatile_type || T == dwarf::DW_TAG_restrict_type || T ==
dwarf::DW_TAG_enumeration_type), function isUnsignedDIType, file
lib/CodeGen/AsmPrinter/DwarfUnit.cpp, line 592.
At that point, T has the value DW_TAG_union_type (0x17), so it looks like the
test at the start of isUnsignedDIType() does not consider union types to be
aggregate types:
// (Pieces of) aggregate types that get hacked apart by SROA may also be
// represented by a constant. Encode them as unsigned bytes.
// FIXME: reference and rvalue_reference /probably/ shouldn't be allowed
// here, but accept them for now due to a bug in SROA producing bogus
// dbg.values.
if (T == dwarf::DW_TAG_array_type ||
T == dwarf::DW_TAG_class_type ||
T == dwarf::DW_TAG_pointer_type ||
T == dwarf::DW_TAG_ptr_to_member_type ||
T == dwarf::DW_TAG_reference_type ||
T == dwarf::DW_TAG_rvalue_reference_type ||
T == dwarf::DW_TAG_structure_type)
return true;
I'm not sure, but maybe DW_TAG_union_type should be added to this test.
Here is a reduced test case to show the problem:
============================================================
union mfi_evt {
struct {
int reserved;
} members;
} mfi_aen_setup() {
union mfi_evt a;
a.members.reserved = 0;
}
============================================================
Compile with "clang -O1 -g -c" to get the assertion.</pre>
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