<html>
<head>
<base href="http://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - DW_AT_frame_base with frame register isn't encoded with DW_OP_fbreg"
href="http://llvm.org/bugs/show_bug.cgi?id=22762">22762</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>DW_AT_frame_base with frame register isn't encoded with DW_OP_fbreg
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</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>
<tr>
<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>hjl.tools@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu, michael.m.kuperstein@intel.com
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=13978" name="attach_13978" title="A testcase">attachment 13978</a> <a href="attachment.cgi?id=13978&action=edit" title="A testcase">[details]</a></span>
A testcase
DwarfExpression::AddMachineRegIndirect in DwarfExpression.cpp has
bool DwarfExpression::AddMachineRegIndirect(unsigned MachineReg, int Offset) {
int DwarfReg = getTRI()->getDwarfRegNum(MachineReg, false);
if (DwarfReg < 0)
return false;
if (isFrameRegister(MachineReg)) {
// If variable offset is based in frame register then use fbreg.
EmitOp(dwarf::DW_OP_fbreg);
EmitSigned(Offset);
} else {
AddRegIndirect(DwarfReg, Offset);
}
return true;
}
X32 uses EBP as frame register and EBP doesn't map to a DWARF register
number. But frame register is special, which should be mapped to
DW_OP_fbreg, regardless its DWARF register number. The check of
DwarfReg < 0 should be moved after if (isFrameRegister(MachineReg))
check.
./llc -mtriple=x86_64-pc-linux-gnux32 -filetype=obj -o x.o x.ll
readelf -w x.o | grep DW_AT_frame_base
<2b> DW_AT_frame_base : 3 byte block: 56 93 4 (DW_OP_reg6 (rbp);
DW_OP_piece: 4)
DW_AT_frame_base DW_FORM_exprloc</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>