* [BUG]Something wrong with evaluate
@ 2011-05-21 16:09 Hui Zhu
2011-05-21 16:19 ` Jan Kratochvil
0 siblings, 1 reply; 6+ messages in thread
From: Hui Zhu @ 2011-05-21 16:09 UTC (permalink / raw)
To: gdb
gdb ./vmlinux
GNU gdb (GDB) 7.3.50.20110521-cvs
(gdb) p 123*4
GDB does not (yet) know how to evaluate that kind of expression
/usr/bin/gdb ./vmlinux
GNU gdb (GDB) 7.2-ubuntu
(gdb) p 123*4
$1 = 492
What is happen?
Thanks,
Hui
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [BUG]Something wrong with evaluate
2011-05-21 16:09 [BUG]Something wrong with evaluate Hui Zhu
@ 2011-05-21 16:19 ` Jan Kratochvil
2011-05-21 16:27 ` Hui Zhu
0 siblings, 1 reply; 6+ messages in thread
From: Jan Kratochvil @ 2011-05-21 16:19 UTC (permalink / raw)
To: Hui Zhu; +Cc: gdb
On Sat, 21 May 2011 18:08:13 +0200, Hui Zhu wrote:
> GDB does not (yet) know how to evaluate that kind of expression
gdb: gdb forgot how to do arithmetic
https://bugzilla.redhat.com/show_bug.cgi?id=635508
->
gcc: -O1 wrong-code by cmove
https://bugzilla.redhat.com/show_bug.cgi?id=634757
->
gcc: [4.5/4.6 Regression] -O1 wrong-code by cmove
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45695
Regards,
Jan
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [BUG]Something wrong with evaluate
2011-05-21 16:19 ` Jan Kratochvil
@ 2011-05-21 16:27 ` Hui Zhu
2011-05-21 16:31 ` Jan Kratochvil
0 siblings, 1 reply; 6+ messages in thread
From: Hui Zhu @ 2011-05-21 16:27 UTC (permalink / raw)
To: Jan Kratochvil; +Cc: gdb
That is a gcc bug?
Thanks,
Hui
On Sun, May 22, 2011 at 00:18, Jan Kratochvil <jan.kratochvil@redhat.com> wrote:
> On Sat, 21 May 2011 18:08:13 +0200, Hui Zhu wrote:
>> GDB does not (yet) know how to evaluate that kind of expression
>
> gdb: gdb forgot how to do arithmetic
> https://bugzilla.redhat.com/show_bug.cgi?id=635508
> ->
> gcc: -O1 wrong-code by cmove
> https://bugzilla.redhat.com/show_bug.cgi?id=634757
> ->
> gcc: [4.5/4.6 Regression] -O1 wrong-code by cmove
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45695
>
>
> Regards,
> Jan
>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [BUG]Something wrong with evaluate
2011-05-21 16:27 ` Hui Zhu
@ 2011-05-21 16:31 ` Jan Kratochvil
2011-05-21 16:34 ` Hui Zhu
0 siblings, 1 reply; 6+ messages in thread
From: Jan Kratochvil @ 2011-05-21 16:31 UTC (permalink / raw)
To: Hui Zhu; +Cc: gdb
On Sat, 21 May 2011 18:26:10 +0200, Hui Zhu wrote:
> That is a gcc bug?
Yes, at least I got this message due to a GCC Bug already fixed some time ago,
one can find it in the Bugs. Unaware if the GCC Bug is gets exploited by
every GDB version or just by some specific GDB versions.
Do you have the problem reproducible if you (re)build that GDB with -O0?
Sure it can be also a completely different problem but I doubt so.
Regards,
Jan
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [BUG]Something wrong with evaluate
2011-05-21 16:31 ` Jan Kratochvil
@ 2011-05-21 16:34 ` Hui Zhu
2011-05-22 2:42 ` Hui Zhu
0 siblings, 1 reply; 6+ messages in thread
From: Hui Zhu @ 2011-05-21 16:34 UTC (permalink / raw)
To: Jan Kratochvil; +Cc: gdb
On Sun, May 22, 2011 at 00:31, Jan Kratochvil <jan.kratochvil@redhat.com> wrote:
> On Sat, 21 May 2011 18:26:10 +0200, Hui Zhu wrote:
>> That is a gcc bug?
>
> Yes, at least I got this message due to a GCC Bug already fixed some time ago,
> one can find it in the Bugs. Unaware if the GCC Bug is gets exploited by
> every GDB version or just by some specific GDB versions.
>
> Do you have the problem reproducible if you (re)build that GDB with -O0?
>
> Sure it can be also a completely different problem but I doubt so.
>
>
> Regards,
> Jan
>
Hi Jan,
My part -O0 gdb is OK. This is a gcc bug. I just update my gcc to
4.5. I will report it to ubuntu.
Thanks for your help.
Best,
Hui
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [BUG]Something wrong with evaluate
2011-05-21 16:34 ` Hui Zhu
@ 2011-05-22 2:42 ` Hui Zhu
0 siblings, 0 replies; 6+ messages in thread
From: Hui Zhu @ 2011-05-22 2:42 UTC (permalink / raw)
To: gdb; +Cc: Jan Kratochvil
Just a small remind.
Tracepoint action teval is affected by this issue too.
Thanks,
Hui
On Sun, May 22, 2011 at 00:33, Hui Zhu <teawater@gmail.com> wrote:
> On Sun, May 22, 2011 at 00:31, Jan Kratochvil <jan.kratochvil@redhat.com> wrote:
>> On Sat, 21 May 2011 18:26:10 +0200, Hui Zhu wrote:
>>> That is a gcc bug?
>>
>> Yes, at least I got this message due to a GCC Bug already fixed some time ago,
>> one can find it in the Bugs. Unaware if the GCC Bug is gets exploited by
>> every GDB version or just by some specific GDB versions.
>>
>> Do you have the problem reproducible if you (re)build that GDB with -O0?
>>
>> Sure it can be also a completely different problem but I doubt so.
>>
>>
>> Regards,
>> Jan
>>
>
> Hi Jan,
>
> My part -O0 gdb is OK. This is a gcc bug. I just update my gcc to
> 4.5. I will report it to ubuntu.
> Thanks for your help.
>
> Best,
> Hui
>
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2011-05-22 2:42 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2011-05-21 16:09 [BUG]Something wrong with evaluate Hui Zhu
2011-05-21 16:19 ` Jan Kratochvil
2011-05-21 16:27 ` Hui Zhu
2011-05-21 16:31 ` Jan Kratochvil
2011-05-21 16:34 ` Hui Zhu
2011-05-22 2:42 ` Hui Zhu
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