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From: "blarsen at redhat dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug c++/26550] Object of class with virtual base classes printed
 incorrectly (gdb.cp/ambiguous.exp)
Date: Wed, 10 Nov 2021 16:52:08 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26550

B. Larsen <blarsen at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |blarsen at redhat dot com

--- Comment #2 from B. Larsen <blarsen at redhat dot com> ---
Hi! I've stated looking at this bug, and I have a new insight

> And with the following we see how GDB is clearly confusing the offset of =
_vptr.KV
> with the offset of A1:
> (gdb) print /x jva1
> $1 =3D {<KV> =3D {<A1> =3D {x =3D 0x2, y =3D 0x16}, _vptr.KV =3D 0x555555=
557b88 <vtable for > JVA1+24>, i =3D 0x457}, ......}
>                                                      ^^^^^^^^^^^^^^
> (gdb) print /x jva1.KV::x
> $2 =3D 0x55557b88
>      ^^^^^^^^^^
> (gdb) print /x jva1.KV::y
> $3 =3D 0x5555

I think the problem runs a little deeper because of the following tests:

(gdb) print &jva1.KV::x
$1 =3D (int *) 0x7fffffffe0f0

(gdb) print &jva1.LV::x
$2 =3D (int *) 0x7fffffffe100

(gdb) p &jva1
$3 =3D (JVA1 *) 0x7fffffffe0f0

and if I understand virtual inheritance correctly (and dissassembly of the
code), $1 and $2 should be the same, both 0x7f...fe100

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