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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-gsymutil reports errors for ICF folded symbols"
href="https://bugs.llvm.org/show_bug.cgi?id=47150">47150</a>
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<th>Summary</th>
<td>llvm-gsymutil reports errors for ICF folded symbols
</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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>DebugInfo
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>phosek@chromium.org
</td>
</tr>
<tr>
<th>CC</th>
<td>jdevlieghere@apple.com, keith.walker@arm.com, llvm-bugs@lists.llvm.org, paul_robinson@playstation.sony.com
</td>
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<p>
<div>
<pre>See the following example:
```
$ cat >t.c <<EOF
int f() {
return 1;
}
int g() {
return 1;
}
int main() {
f();
g();
return 0;
}
EOF
$ clang -g3 -c t.c -o t.o -ffunction-sections
$ clang -g3 t.o -o t -Wl,--icf=all
$ llvm-gsymutil --convert=t --out-file=t.gsym
error: line table has addresses that do not monotonically increase:
0x00000000002016c0 1 0 1 0 0 is_stmt
0x00000000002016c4 2 3 1 0 0 is_stmt prologue_end
0x00000000002016c0 5 0 1 0 0 is_stmt
0x00000000002016c4 6 3 1 0 0 is_stmt prologue_end
0x0000002a: DW_TAG_subprogram
DW_AT_low_pc (0x00000000002016c0)
DW_AT_high_pc (0x00000000002016cb)
DW_AT_frame_base (DW_OP_reg6)
DW_AT_name ("f")
DW_AT_decl_file ("/src/clang-llvm/llvm-build/debug/t.c")
DW_AT_decl_line (1)
DW_AT_type (0x00000075 "int")
DW_AT_external (true)
Loaded 2 functions from DWARF.
Loaded 10 functions from symbol table.
Pruned 0 functions, ended with 12 total
```
The line table has the following:
```
0x0000002a: DW_TAG_subprogram
DW_AT_low_pc (0x00000000002016c0)
DW_AT_high_pc (0x00000000002016cb)
DW_AT_frame_base (DW_OP_reg6 RBP)
DW_AT_name ("f")
DW_AT_decl_file ("/src/clang-llvm/llvm-build/debug/t.c")
DW_AT_decl_line (1)
DW_AT_type (0x00000075 "int")
DW_AT_external (true)
0x00000043: DW_TAG_subprogram
DW_AT_low_pc (0xffffffffffffffff)
DW_AT_high_pc (0x000000000000000a)
DW_AT_frame_base (DW_OP_reg6 RBP)
DW_AT_name ("g")
DW_AT_decl_file ("/src/clang-llvm/llvm-build/debug/t.c")
DW_AT_decl_line (5)
DW_AT_type (0x00000075 "int")
DW_AT_external (true)
```
The DIE for f has the correct low_pc while the DIE for g the tombstone low_pc
and an accordingly bogus high_pc (real_high_pc - real_low_pc - 1). However, the
both entries survived into the line table.</pre>
</div>
</p>
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