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From: "ks1322 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/112491] New: std::deque<T,Allocator>::size xmethod
 output is wrong
Date: Sun, 12 Nov 2023 12:21:12 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 13.2.1
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: ks1322 at gmail dot com
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112491

            Bug ID: 112491
           Summary: std::deque<T,Allocator>::size xmethod output is wrong
           Product: gcc
           Version: 13.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ks1322 at gmail dot com
  Target Milestone: ---

For this code:
```
#include <deque>

int main()
{
    std::deque<int> d;

    d.push_front(0);
    return 0;
}
```
deque size xmethod produces wrong result
```
$ gdb -batch -ex "b 8" -ex r -ex "p d.size()" a.out
Breakpoint 1 at 0x4011f5: file /tmp/t.cpp, line 8.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".

Breakpoint 1, main () at /tmp/t.cpp:8
8           return 0;
$1 =3D 128
```

Expected result is 1 while actual result is 128.
As a workaround xmethods can be disabled with `disable xmethod`
```
$ gdb -batch -ex "b 8" -ex r -ex "disable xmethod" -ex "p d.size()" a.out
Breakpoint 1 at 0x4011f5: file /tmp/t.cpp, line 8.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".

Breakpoint 1, main () at /tmp/t.cpp:8
8           return 0;
$1 =3D 1
```=