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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 - Missing variables after inlining pass at O3"
href="https://bugs.llvm.org/show_bug.cgi?id=49973">49973</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Missing variables after inlining pass at O3
</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>cristianassaiante@outlook.com
</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>Upon calling a function from an external module, the variable l_128 passed to
it is not visible from lldb. Using -opt-bisect-limit we discovered that the
pass causing the symbols disappear is "InlinerPass on SCC".
$ cat a.c
enum {
a
}b ;
void c()
{
int l_128 = b = 4;
for (; b ; b = 0)
l_128 = 1;
test_nop();
test_support_3008(l_128);
}
int main ()
{
c();
}
$ cat lib/test.c
#include <stdio.h>
#include <stdint.h>
#include "test.h"
void test_nop() {
printf("\n");
}
void test_support_3008(int l_128) {
printf("%d", l_128);
}
$ cat lib/test.h
#pragma once
void test_nop();
void test_support_3008(int l_128);
$ clang -v
clang version 13.0.0
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
$ lldb -v
lldb version 13.0.0
clang revision c2c977ce50597b0e5186afc342c5784bd0aa6973
lldb revision c2c977ce50597b0e5186afc342c5784bd0aa6973
$ clang -g -O3 -o opt lib/test.c a.c
$ lldb opt
(lldb) target create "opt"
Current executable set to
'/home/stepping/debuginfo-analysis/bug_submission/opt' (x86_64).
(lldb) b 10
Breakpoint 1: 2 locations.
(lldb) r
Process 27 launched: '/home/stepping/debuginfo-analysis/bug_submission/opt'
(x86_64)
Process 27 stopped
* thread #1, name = 'opt', stop reason = breakpoint 1.2
frame #0: 0x0000000000400572 opt`main [inlined] c at a.c:10:1
7 for (; b ; b = 0)
8 l_128 = 1;
9 test_nop();
-> 10 test_support_3008(l_128);
11 }
12 int main ()
13 {
(lldb) frame var
(lldb) frame var l_128
error: no variable named 'l_128' found in this frame</pre>
</div>
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