<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Namespace clash displaying 'this'"
href="https://bugs.llvm.org/show_bug.cgi?id=36547">36547</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Namespace clash displaying 'this'
</td>
</tr>
<tr>
<th>Product</th>
<td>lldb
</td>
</tr>
<tr>
<th>Version</th>
<td>6.0
</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>dantipov@nvidia.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=19970" name="attach_19970" title="Sample program">attachment 19970</a> <a href="attachment.cgi?id=19970&action=edit" title="Sample program">[details]</a></span>
Sample program
$ /home/dantipov/.local/llvm-6.0.0/bin/lldb t-class2
(lldb) target create "t-class2"
Current executable set to 't-class2' (x86_64).
(lldb) breakpoint set -n S::B::f
Breakpoint 1: where = t-class2`S::B::f(int) at t-class2.cc:25, address =
0x000000000040076a
(lldb) breakpoint set -n S::B::g
Breakpoint 2: where = t-class2`S::B::g(int) + 11 at t-class2.cc:26, address =
0x0000000000400789
(lldb) run
Process 5180 launched: '/home/dantipov/tmp/t-class2' (x86_64)
Process 5180 stopped
* thread #1, name = 't-class2', stop reason = breakpoint 1.1
frame #0: 0x000000000040076a t-class2`S::B::f(this=0x00007fffffffdb50, x=1)
at t-class2.cc:25
22 struct B: AS {
23 int id1;
24 B () { id1 = 444; }
-> 25 virtual int f (int x) { return x + 4; }
26 int g (int x) { return x + 14; }
27 };
28 }
(lldb) bt
* thread #1, name = 't-class2', stop reason = breakpoint 1.1
* frame #0: 0x000000000040076a t-class2`S::B::f(this=0x00007fffffffdb50, x=1)
at t-class2.cc:25
frame #1: 0x0000000000400643 t-class2`main(argc=1, argv=0x00007fffffffdc58)
at t-class2.cc:36
frame #2: 0x00007ffff712000a
libc.so.6`__libc_start_main(main=(t-class2`main at t-class2.cc:31), argc=1,
argv=0x00007fffffffdc58, init=<unavailable>, fini=<unavailable>,
rtld_fini=<unavailable>, stack_end=0x00007fffffffdc48) at libc-start.c:308
frame #3: 0x000000000040054a t-class2`_start + 42
(lldb) p this
(S::B *) $0 = 0x00007fffffffdb50
(lldb) p *this
(S::B) $1 = {
S::AS = (id0 = 111)
id1 = 222
}
(lldb) c
Process 5180 resuming
Process 5180 stopped
* thread #1, name = 't-class2', stop reason = breakpoint 2.1
frame #0: 0x0000000000400789 t-class2`S::B::g(this=0x00007fffffffdb40, x=1)
at t-class2.cc:26
23 int id1;
24 B () { id1 = 444; }
25 virtual int f (int x) { return x + 4; }
-> 26 int g (int x) { return x + 14; }
27 };
28 }
29
(lldb) bt
* thread #1, name = 't-class2', stop reason = breakpoint 2.1
* frame #0: 0x0000000000400789 t-class2`S::B::g(this=0x00007fffffffdb40, x=1)
at t-class2.cc:26
frame #1: 0x0000000000400669 t-class2`main(argc=1, argv=0x00007fffffffdc58)
at t-class2.cc:38
frame #2: 0x00007ffff712000a
libc.so.6`__libc_start_main(main=(t-class2`main at t-class2.cc:31), argc=1,
argv=0x00007fffffffdc58, init=<unavailable>, fini=<unavailable>,
rtld_fini=<unavailable>, stack_end=0x00007fffffffdc48) at libc-start.c:308
frame #3: 0x000000000040054a t-class2`_start + 42
(lldb) p this
(S::B *) $2 = 0x00007fffffffdb40
(lldb) p *this
(S::B) $3 = {
S::AS = (id0 = 333)
id1 = 444
}
Here 'this' is different between calls to obj2.f () and obj2.g ()
(0x00007fffffffdb50 vs.
0x00007fffffffdb40), and objects are shown as different as well - {111, 222}
vs. {333, 444}.
OTOH in gdb it is:
$ gdb -q t-class2
Reading symbols from t-class2...done.
(gdb) b S::B::f
Breakpoint 1 at 0x400775: file t-class2.cc, line 25.
(gdb) b S::B::g
Breakpoint 2 at 0x400789: file t-class2.cc, line 26.
(gdb) r
Starting program: /home/dantipov/tmp/t-class2
Breakpoint 1, S::B::f (this=0x7fffffffdb50, x=1) at t-class2.cc:25
25 virtual int f (int x) { return x + 4; }
(gdb) bt
#0 S::B::f (this=0x7fffffffdb50, x=1) at t-class2.cc:25
#1 0x0000000000400643 in main (argc=1, argv=0x7fffffffdc68) at t-class2.cc:36
(gdb) p this
$1 = (S::B * const) 0x7fffffffdb50
(gdb) p *this
$2 = {<S::AS> = {_vptr.AS = 0x400840 <vtable for S::B+16>, id0 = 333}, id1 =
444}
(gdb) c
Continuing.
Breakpoint 2, S::B::g (this=0x7fffffffdb50, x=1) at t-class2.cc:26
26 int g (int x) { return x + 14; }
(gdb) bt
#0 S::B::g (this=0x7fffffffdb50, x=1) at t-class2.cc:26
#1 0x0000000000400669 in main (argc=1, argv=0x7fffffffdc68) at t-class2.cc:38
(gdb) p this
$3 = (S::B * const) 0x7fffffffdb50
(gdb) p *this
$4 = {<S::AS> = {_vptr.AS = 0x400840 <vtable for S::B+16>, id0 = 333}, id1 =
444}
E.g. in calls to obj2.f () and obj2.g (), 'this' is 0x7fffffffdb50, and the
object
itself is {333, 444}.</pre>
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