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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 - inconsistent behaviors: the source code lines an address belongs to is inconsistent at source-level debugging and instruction-level debugging"
href="https://bugs.llvm.org/show_bug.cgi?id=48467">48467</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>inconsistent behaviors: the source code lines an address belongs to is inconsistent at source-level debugging and instruction-level debugging
</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=24259" name="attach_24259" title="binary">attachment 24259</a> <a href="attachment.cgi?id=24259&action=edit" title="binary">[details]</a></span>
binary
$ clang -v
Ubuntu clang version
12.0.0-++20201202063839+f0193623297-1~exp1~20201202174527.2077
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/10
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/7.5.0
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
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/bin/../lib/gcc/x86_64-linux-gnu/10
Candidate multilib: .;@m64
Selected multilib: .;@m64
$ lldb -v
lldb version 12.0.0
$ 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; // Line 10
}
int main(int argc, char **argv)
{
if (argc > 0)
foo (); // Line 16
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 main
Breakpoint 1: where = a.out`main + 11 at small.c:15:12, address =
0x000000000040056b
(lldb) r
Process 42468 stopped
frame #0: 0x000000000040056b a.out`main(argc=1, argv=0x00007fffffffe038) at
small.c:15:12
-> 15 if (argc > 0)
(lldb) s
Process 42468 stopped
frame #0: 0x000000000040056f a.out`main(argc=1, argv=0x00007fffffffe038) at
small.c:16
-> 16 foo (); // Line 16
(lldb) s
frame #0: 0x000000000040056f a.out`main [inlined] foo at small.c:10:5
-> 10 x = TagTypeNumber + 1; // Line 10
(lldb)
############################################################
We can found that when step line by line, 0x000000000040056f belongs to Line 16
and Line 10.
However, when step instruction by instruction, 0x000000000040056f only belongs
to 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
Process 42608 stopped
frame #0: 0x000000000040056b a.out`main(argc=1, argv=0x00007fffffffe038) at
small.c:15:12
-> 15 if (argc > 0)
(lldb) si
Process 42608 stopped
frame #0: 0x000000000040056d a.out`main(argc=1, argv=0x00007fffffffe038) at
small.c:15:7
-> 15 if (argc > 0)
(lldb) si
Process 42608 stopped
frame #0: 0x000000000040056f a.out`main(argc=1, argv=0x00007fffffffe038) at
small.c:16
-> 16 foo (); // Line 16
(lldb) si
Process 42608 stopped
frame #0: 0x0000000000400573 a.out`main [inlined] foo at small.c:10:5
-> 10 x = TagTypeNumber + 1; // Line 10
(lldb)</pre>
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