From: Ian Lance Taylor <iant@google.com>
To: naveen yadav <yad.naveen@gmail.com>
Cc: gcc-help@gcc.gnu.org, gdb@sourceware.org
Subject: Re: Issue with GDB 7.0 on MIPS(gcc 4.4.1)
Date: Mon, 14 Nov 2011 18:01:00 -0000 [thread overview]
Message-ID: <mcr62imbn2a.fsf@dhcp-172-18-216-180.mtv.corp.google.com> (raw)
In-Reply-To: <CAJ8eaTxN6WDzyA1YvabSzQkuvge06N_yhcT45OiT45OQ8NKFvw@mail.gmail.com> (naveen yadav's message of "Mon, 14 Nov 2011 12:49:10 +0530")
naveen yadav <yad.naveen@gmail.com> writes:
> So I just request is there any patch available to fix this problem ?
I don't know. As I said earlier, current versions of gcc are much
better at debugging info for inlined functions, and are much better at
not incorrectly reporting variable values for optimized code. However,
I have no idea whether that will help with this specific problem.
Ian
> On Mon, Nov 14, 2011 at 12:20 PM, Ian Lance Taylor <iant@google.com> wrote:
>> naveen yadav <yad.naveen@gmail.com> writes:
>>
>>> My GCC version 4.4.1. and here is source code.
>>>
>>> http://gingacdn.lavid.ufpb.br/projects/ginga-j/repository/revisions/7e233c1906624b0e01698415987aada3fd8c3fe4/entry/gingaj/jvm/src/share/javavm/runtime/gc/generational/gen_markcompact.c
>>>
>>> and here is backtrace.
>>>
>>> mips-gdb> bt
>>> sweep (gen=0x5d5f508, ee=0x5c4300d0, numBytes=4294967295,
>>> gcOpts=0x5c3408f8) #1
>>> CVMgenMarkCompactCollect (gen=0x5d5f508, ee=0x5c4300d0,
>>> numBytes=4294967295, gcOpts=0x5c3408f8)
>>
>> Looking at the code, it's perfectly obvious that gdb is reporting the
>> arguments to sweep incorrectly. The sweep function takes three
>> arugments: thisGen, base, and top. It is called only from
>> CVMgenMarkCompactCollect, and that function takes four arguments, gen,
>> ee, numBytes, and gcOpts.
>>
>> Clearly the parameters to sweep are being reported incorrectly. I don't
>> think you really needed me to tell you that. I don't know where the bug
>> is, but my guess would be that gcc 4.4.1 is not generating correct debug
>> info for inlined functions.
>>
>> Ian
>>
>>
>>>
>>> ......
>>>
>>> If you need more detail pls let me know..
>>> Thanks.
>>>
>>> On Fri, Nov 11, 2011 at 10:01 PM, Ian Lance Taylor <iant@google.com> wrote:
>>>> naveen yadav <yad.naveen@gmail.com> writes:
>>>>
>>>>> I am running one application and it generate core dump. When I run bt .
>>>>> (gdb) bt
>>>>> #0 sweep (gn=0x5d5f58, ef=0x5c43000, Bytes=429496729, gcOs=0x5c3408f)
>>>>> #1 CompactCollect (gn=0x5d5f58, ef=0x5c43000, Bytes=429496729, gcOs=0x5c3408f)
>>>>> ...
>>>>>
>>>>> In above case
>>>>> we got crash in wepp().
>>>>> CompactCollect () is main function and wepp() is another function
>>>>> which got called from CompactCollect ().
>>>>>
>>>>> When I check the assembly wepp() become inline.
>>>>> So i got bit surprise when i check that function parameter;s for both
>>>>> wepp() and CompactCollect () are same.
>>>>>
>>>>> So is it correct behaviour ? that calling and calle have same parameter
>>>>
>>>> Without any information about the source code, I don't see how we can
>>>> tell whether having the same parameters is correct behaviour or not.
>>>>
>>>> That said, it is certainly possible that the arguments of the inlined
>>>> function are not being displayed correctly. Mainline gcc has gotten
>>>> quite a bit better about debug info for inlined functions and in general
>>>> for avoiding incorrect display of variables in optimized code.
>>>>
>>>> Ian
>>>>
>>
prev parent reply other threads:[~2011-11-14 18:01 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-11 7:48 naveen yadav
2011-11-11 16:31 ` Ian Lance Taylor
2011-11-14 5:14 ` naveen yadav
2011-11-14 6:50 ` Ian Lance Taylor
2011-11-14 7:19 ` naveen yadav
2011-11-14 18:01 ` Ian Lance Taylor [this message]
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