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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - llvm-dwarfdump fails to dump debug_frame info because of empty CIEs in the section"
href="https://bugs.llvm.org/show_bug.cgi?id=45485">45485</a>
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<tr>
<th>Summary</th>
<td>llvm-dwarfdump fails to dump debug_frame info because of empty CIEs in the section
</td>
</tr>
<tr>
<th>Product</th>
<td>tools
</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>llvm-dwarfdump
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>cdenizet@mozilla.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<pre>Created <span class=""><a href="attachment.cgi?id=23338" name="attach_23338" title="Elf file with the guilty section">attachment 23338</a> <a href="attachment.cgi?id=23338&action=edit" title="Elf file with the guilty section">[details]</a></span>
Elf file with the guilty section
A firefox library (libxul.so) contains some zero at beginning of the section
.debug_frame:
readelf -x .debug_frame libxul.so | head -10
Hex dump of section '.debug_frame':
0x00000000 00000000 00000000 00000000 00000000 ................
0x00000010 00000000 00000000 00000000 00000000 ................
0x00000020 00000000 00000000 00000000 00000000 ................
0x00000030 00000000 00000000 00000000 00000000 ................
0x00000040 00000000 00000000 00000000 00000000 ................
0x00000050 00000000 00000000 00000000 00000000 ................
0x00000060 00000000 00000000 00000000 00000000 ................
0x00000070 00000000 00000000 14000000 ffffffff ................
So I compiled it using -Wl,-Map,map and I get in the map file:
VMA LMA Size Align Out In Symbol
0 0 84d8 8 .debug_frame
0 0 4 8
../../../media/libdav1d/asm/cdef.o:(.debug_frame)
8 8 4 8
../../../media/libdav1d/asm/cdef_sse.o:(.debug_frame)
10 10 4 8
../../../media/libdav1d/asm/cpuid.o:(.debug_frame)
18 18 4 8
../../../media/libdav1d/asm/film_grain.o:(.debug_frame)
20 20 4 8
../../../media/libdav1d/asm/ipred.o:(.debug_frame)
28 28 4 8
../../../media/libdav1d/asm/ipred_ssse3.o:(.debug_frame)
30 30 4 8
../../../media/libdav1d/asm/itx.o:(.debug_frame)
38 38 4 8
../../../media/libdav1d/asm/itx_ssse3.o:(.debug_frame)
40 40 4 8
../../../media/libdav1d/asm/loopfilter.o:(.debug_frame)
48 48 4 8
../../../media/libdav1d/asm/loopfilter_ssse3.o:(.debug_frame)
50 50 4 8
../../../media/libdav1d/asm/looprestoration.o:(.debug_frame)
58 58 4 8
../../../media/libdav1d/asm/looprestoration_ssse3.o:(.debug_frame)
60 60 4 8
../../../media/libdav1d/asm/mc.o:(.debug_frame)
68 68 4 8
../../../media/libdav1d/asm/mc_ssse3.o:(.debug_frame)
70 70 4 8
../../../media/libdav1d/asm/msac.o:(.debug_frame)
78 78 c58 8
/home/calixte/dev/mozilla/mozilla-central.hg/obj-x86_64-pc-linux-gnu/x86_64-unknown-linux-gnu/release/libgkrust.a(tinystr-42ea65f827942861.tinystr.2dk5ccm8-cgu.0.rcgu.o):(.debug_frame)
These zeros correspond to empty CIEs and should be just skipped.</pre>
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