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From YixunZhou <seanny2...@gmail.com>
Subject Re: How to use gdb to debug interpreter?
Date Fri, 20 Feb 2009 01:30:49 GMT

Thank you. I've read it, but got  some confused.  I solved the  previous 
problem,  and  would try
[1] for new one~

> Please, specify -XX:+crash_handler in the command line of your java.
> It will give you gdb attached to the point of segfault. Then you can
> examine post-mortem state of the VM.
>
> Please, also read [1] for tips on debugging various VM parts.
>
> Pavel.
>
> [1] http://harmony.apache.org/subcomponents/drlvm/debugging_VM_and_JIT.html
>
> On Thu, Feb 19, 2009 at 6:19 AM, YixunZhou <seanny2003@gmail.com> wrote:
>   
>> Hi all,
>>
>>   I modified harmony to make it support ClassRedefine, but I got a
>> segmentation fault when called new to create an instance of
>> the new version class. I changed to interpreter mode, and found the problem
>> happened when executing OPCODE_INVOKESPECIAL.
>>
>> case OPCODE_INVOKESPECIAL:
>>                              // Next line marks the
>> "P_TLS_vmthread->thread_exception" that an exception happened.
>>                               Opcode_INVOKESPECIAL(frame);
>>                               // get_current_thread_exception  can not
>> handle the exception properly and cause the segment fault.
>>                               frame.exc = get_current_thread_exception();
>>
>> I was using "printf" to locate the bug, but it is too complicated here. But
>> when I use gdb to trace the execution, it cannot follow the function
>> pointer "(*env)->CallStaticVoidMethod (env, cls, mid, args);" in main.c.
>>
>> So, how can I use gdb to debug the interpreter? Thanks.
>>
>>
>> --
>>
>> Best regard,
>> Yixun Zhou
>> seanny2003@gmail.com
>>
>>
>>
>>     
>
>   


-- 

Best regard,
Yixun Zhou
seanny2003@gmail.com



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