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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Wrong mapping assembly-line at Og"
href="https://bugs.llvm.org/show_bug.cgi?id=51751">51751</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Wrong mapping assembly-line at Og
</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>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>DebugInfo
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>artuso@diag.uniroma1.it
</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>
</tr></table>
<p>
<div>
<pre>Comment:
The debugger wrongly associates the mov instruction "0x40049a <+10>: movw $0x0,
0x200b89(%rip)" to line 6, which is the call to func_1, instead of line 3 which
is the actual assignment.
Steps to reproduce bug:
root@69ab245e01ef:/home/stepping/output# clang -v
clang version 14.0.0 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a>
957334382cd12ec07b46c0ddfdcc220731f6d80f)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.5.0
Candidate multilib: .;@m64
Selected multilib: .;@m64
root@69ab245e01ef:/home/stepping/output# lldb -v
lldb version 14.0.0 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a> revision
957334382cd12ec07b46c0ddfdcc220731f6d80f)
clang revision 957334382cd12ec07b46c0ddfdcc220731f6d80f
llvm revision 957334382cd12ec07b46c0ddfdcc220731f6d80f
root@69ab245e01ef:/home/stepping/output# cat a.c
short a;
int b;
void func_1() { a = 0; }
int main() {
b = 0;
func_1();
}
root@69ab245e01ef:/home/stepping/output# cat -n a.c
1 short a;
2 int b;
3 void func_1() { a = 0; }
4 int main() {
5 b = 0;
6 func_1();
7 }
root@69ab245e01ef:/home/stepping/output# clang -Og -g -Wno-everything -o opt
a.c
root@69ab245e01ef:/home/stepping/output# lldb opt
(lldb) target create "opt"
Current executable set to '/home/stepping/output/opt' (x86_64).
(lldb) b main
Breakpoint 1: where = opt`main at a.c:5:5, address = 0x0000000000400490
(lldb) r
Process 55 launched: '/home/stepping/output/opt' (x86_64)
Process 55 stopped
* thread #1, name = 'opt', stop reason = breakpoint 1.1
frame #0: 0x0000000000400490 opt`main at a.c:5:5
2 int b;
3 void func_1() { a = 0; }
4 int main() {
-> 5 b = 0;
6 func_1();
7 }
(lldb) si
Process 55 stopped
* thread #1, name = 'opt', stop reason = instruction step into
frame #0: 0x000000000040049a opt`main at a.c:6:3
3 void func_1() { a = 0; }
4 int main() {
5 b = 0;
-> 6 func_1();
7 }
(lldb) di -l
opt`main:
-> 0x40049a <+10>: movw $0x0, 0x200b89(%rip) ; completed.7698
5 b = 0;
6 func_1();
** 7 }
0x4004a3 <+19>: xorl %eax, %eax
0x4004a5 <+21>: retq
0x4004a6: nopw %cs:(%rax,%rax)
opt`__libc_csu_init:
0x4004b0 <+0>: pushq %r15
0x4004b2 <+2>: pushq %r14
0x4004b4 <+4>: movq %rdx, %r15
0x4004b7 <+7>: pushq %r13</pre>
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