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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - .debug_ranges section is broken"
href="http://llvm.org/bugs/show_bug.cgi?id=19563">19563</a>
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<tr>
<th>Summary</th>
<td>.debug_ranges section is broken
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<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>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>samsonov@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dblaikie@gmail.com, echristo@gmail.com, eugeni.stepanov@gmail.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>$ cat tmp/symbolizer/a.cc
#include <stdio.h>
void f() {
int * volatile p = new int;
if (*p)
printf("zzz\n");
}
int main(void) {
f();
return 0;
}
$ ./bin/clang++ -O2 -g -fsanitize=memory tmp/symbolizer/a.cc
$ readelf -wi a.out
<...>
<1><104a1a>: Abbrev Number: 5 (DW_TAG_subprogram)
<104a1b> DW_AT_name : (indirect string, offset: 0x352bf): main
<104a1f> DW_AT_decl_file : 1
<104a20> DW_AT_decl_line : 9
<104a21> DW_AT_type : <0x104a4f>
<104a25> DW_AT_external : 1
<104a25> DW_AT_accessibility: 1 (public)
<104a26> DW_AT_low_pc : 0x86570
<104a2e> DW_AT_high_pc : 0xb4
<104a32> DW_AT_frame_base : 1 byte block: 57 (DW_OP_reg7 (rsp))
<104a34> Unknown AT value: 3fe7: 1
<2><104a34>: Abbrev Number: 6 (DW_TAG_inlined_subroutine)
<104a35> DW_AT_abstract_origin: <0x1049ea>
<104a39> DW_AT_ranges : 0x5de90
<104a3d> DW_AT_call_file : 1
<104a3e> DW_AT_call_line : 10
$ readelf -wR a.out
<...>
0005de90 000000000010ca46 000000000010cac4
0005de90 000000000010cada 000000000010cae4
0005de90 <End of list>
Address ranges for inlined subroutine in .debug_ranges are wrong.
The addresses in range list from .debug_ranges should be relative to
the base address (DW_AT_low_pc) of compilation unit that refers this range
list. In this example the addresses written in the binary are absolute. If I
subtract base address of an a.cc CU (0x864c0) from these addresses, range lists
become correct.
I haven't found a revision which broke this yet. Working on that.</pre>
</div>
</p>
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