<html>
<head>
<base href="https://bugs.llvm.org/">
</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 - LLDB is missing support for DW_OP_implicit_value dwarf operation"
href="https://bugs.llvm.org/show_bug.cgi?id=46833">46833</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>LLDB is missing support for DW_OP_implicit_value dwarf operation
</td>
</tr>
<tr>
<th>Product</th>
<td>lldb
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>lldb-dev@lists.llvm.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>sourav0311@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>jdevlieghere@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>LLDB is missing support for DW_OP_implicit_value dwarf operation.
clang was also not supporting this, seems like in some cases
DW_op_implicit_value is indispensable.
Support is added in clang with currently emission restricted for debugger
tunning GDB.
For more details please refer: <a href="https://reviews.llvm.org/D83560">https://reviews.llvm.org/D83560</a>
For a typical use case compiled as
$tot-clang -ggdb -O1 test.c
or with gcc also
$gcc -ggdb -O1 test.c //GCC uses DW_OP_implicit_value ubiquitously for all
floating point constants.
Error log:
Process 24530 launched: '/hack/a.out' (x86_64)
Process 24530 stopped
* thread #1, name = 'a.out', stop reason = breakpoint 1.1
frame #0: 0x000000000040112a a.out`main at implicit-float.c:3:2
1 int main() {
2 float a = 3.14f;
-> 3 printf("foo\n");
4 a *= a;
5 return 0;
6 }
(lldb) p a
error: Couldn't materialize: couldn't get the value of variable a: Unhandled
opcode DW_OP_implicit_value in DWARFExpression
error: errored out in DoExecute, couldn't PrepareToExecuteJITExpression</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>