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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - incorrect results of expression evaluation"
href="https://bugs.llvm.org/show_bug.cgi?id=37840">37840</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>incorrect results of expression evaluation
</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>tianxiao.gu@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=20442" name="attach_20442" title="scripts to reproduce the issue.">attachment 20442</a> <a href="attachment.cgi?id=20442&action=edit" title="scripts to reproduce the issue.">[details]</a></span>
scripts to reproduce the issue.
## Overview
lldb command print/expression produces incorrect values.
This issue can be reproduced with lldb 7.0.
~~~
$ lldb -version
lldb version 7.0.0 (<a href="http://llvm.org/svn/llvm-project/lldb/trunk">http://llvm.org/svn/llvm-project/lldb/trunk</a> revision
334970)
clang revision 334970
llvm revision 334970
~~~
## Input Program
~~~~
#include <stdio.h>
#include <stdlib.h>
int main() {
int32_t g_1974 = 1482617779;
int16_t g_159 = -7666;
printf("%d\n", g_1974 & g_159); // break here and see the result of (g_1974 &
g_159)
return 0;
}
~~~
## Reproduce Steps
The attached zip file contains files that can reproduce the issue.
1. See results of lldb by running `run-lldb.sh`.
(lldb) target create "a.out"
Current executable set to 'a.out' (x86_64).
(lldb) command source -s 0 'lldb-cmds.txt'
Executing commands in '/home/t/<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Need to add product version numbers"
href="show_bug.cgi?id=1">bug1</a>/lldb-cmds.txt'.
(lldb) breakpoint set -file test.c -line 7
Breakpoint 1: where = a.out`main + 45 at test.c:7, address = 0x0000000000400553
(lldb) process launch
1482613250
Process 20892 stopped
* thread #1, name = 'a.out', stop reason = breakpoint 1.1
frame #0: 0x0000000000400553 a.out`main at test.c:7
4 int32_t g_1974 = 1482617779;
5 int16_t g_159 = -7666;
6 printf("%d\n", g_1974 & g_159);
-> 7 return 0;
8 }
Process 20892 launched: '/home/t/<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Need to add product version numbers"
href="show_bug.cgi?id=1">bug1</a>/a.out' (x86_64)
(lldb) print g_1974
(int32_t) $0 = 1482617779
(lldb) print g_159
(int16_t) $1 = -7666
(lldb) print (g_1974 & g_159)
(int) $2 = 57858 <--- HERE SHOULD BE 1482613250
2. Run `run-gdb.sh` for gdb.
Breakpoint 1 at 0x400553: file test.c, line 7.
1482613250
Breakpoint 1, main () at test.c:7
7 return 0;
$1 = 1482617779
$2 = -7666
$3 = 1482613250</pre>
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