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<head>
<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 - lldb wrongly stopped at an unexecuted statement"
href="https://bugs.llvm.org/show_bug.cgi?id=48382">48382</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>lldb wrongly stopped at an unexecuted statement
</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>normal
</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>yangyibiao@nju.edu.cn
</td>
</tr>
<tr>
<th>CC</th>
<td>jdevlieghere@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=24233" name="attach_24233" title="the binary 'a.out'">attachment 24233</a> <a href="attachment.cgi?id=24233&action=edit" title="the binary 'a.out'">[details]</a></span>
the binary 'a.out'
$ cat small.c
/* { dg-options "-O2" } */
/* { dg-do run } */
static const long long int TagTypeNumber = 0xffff000000000000ll;
long long int x;
void foo(void)
{
x = TagTypeNumber + 1;
}
int main(int argc, char **argv)
{
if (argc > 0)
foo ();
if ((x & TagTypeNumber) == TagTypeNumber)
{
unsigned y = (unsigned)x;
__builtin_printf ("v: %u\n", y);
if (y != 1)
__builtin_abort ();
}
return 0;
}
$ clang -O2 -g small.c
$ lldb a.out
(lldb) target create "a.out"
Current executable set to '/root/DeVIL/a.out' (x86_64).
(lldb) b 16
Breakpoint 1: where = a.out`main + 45 at small.c:18:8, address =
0x000000000040058d
(lldb) r
Process 45445 launched: '/root/DeVIL/a.out' (x86_64)
v: 1
Process 45445 exited with status = 0 (0x00000000)
(lldb)
########################################
# when step by step, lldb is wrongly stopped at line 16 as follows.
########################################
$ lldb a.out
(lldb) target create "a.out"
Current executable set to '/root/DeVIL/a.out' (x86_64).
(lldb) b main
Breakpoint 1: where = a.out`main + 11 at small.c:15:12, address =
0x000000000040056b
(lldb) r
13 int main(int argc, char **argv)
14 {
-> 15 if (argc > 0)
16 foo ();
17
(lldb) s
13 int main(int argc, char **argv)
14 {
15 if (argc > 0)
-> 16 foo ();
17
(lldb) s
8 void foo(void)
9 {
-> 10 x = TagTypeNumber + 1;
11 }
##########################
# clang and lldb versin
$ clang --version
Ubuntu clang version
12.0.0-++20201202063839+f0193623297-1~exp1~20201202174527.2077
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
$ lldb --version
lldb version 12.0.0</pre>
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