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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 --- - Location list is not being generated"
href="http://llvm.org/bugs/show_bug.cgi?id=21881">21881</a>
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<th>Summary</th>
<td>Location list is not being generated
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: PowerPC
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
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<th>Reporter</th>
<td>katya_romanova@playstation.sony.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>
<div>
<pre>I fixed PR21176 and submitted a fix for it in r223981. However, buildbot's
testing failed for ppc64 platform on the new test that I added.
I reverted my fix completely in r224000, but I'm planning to put the fix back
shortly with XFAIL condition for ppc64.
My test failed for PowerPC because a location list for a variable is not being
generated, where expected.
Consider the following testcase:
----------------------
extern int func();
int main()
{
volatile int c = 13;
c = func();
return c;
}
----------------------
PPC:
llc -mtriple=powerpc64-unknown-linux test.ll -O2 -dwarf-version 2
-filetype=obj
For PPC DWARF Location lists are not generated and variable 'c' has to
DW_AT_const_value (13).
0x0000004f: DW_TAG_variable [3]
DW_AT_const_value [DW_FORM_sdata] (13)
DW_AT_name [DW_FORM_strp] ( .debug_str[0x00000068] = "c")
DW_AT_decl_file [DW_FORM_data1] ("test.cpp")
DW_AT_decl_line [DW_FORM_data1] (4)
DW_AT_type [DW_FORM_ref4] (cu + 0x0063 => {0x00000063})
X86_64:
All other LLVM supported targets generate a location list;
Die for variable 'c' contains DW_AT_location attribute.
llc -mtriple=x86_64-unknown-linux test.ll -O2 -dwarf-version 2 -filetype=obj
0x0000004f: DW_TAG_variable [3]
DW_AT_location [DW_FORM_data4] (0x00000000)
DW_AT_name [DW_FORM_strp] ( .debug_str[0x00000068] = "c")
DW_AT_decl_file [DW_FORM_data1] ("test.cpp")
DW_AT_decl_line [DW_FORM_data1] (4)
DW_AT_type [DW_FORM_ref4] (cu + 0x0066 => {0x00000066})
.debug_loc contents:
0x00000000: Beginning address offset: 0x0000000000000001
Ending address offset: 0x000000000000000e
Location description: 10 0d
Beginning address offset: 0x000000000000000e
Ending address offset: 0x0000000000000016
Location description: 50 93 04</pre>
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