Looking for directions about compiling and tracing OpenJDK

[Amos Shapira]

Thanks to both of you.

To give more details of what I'm after - I want to know whether the class
bytecode address points into the mmap(2)'ed jar file or into malloc(3)'ed
memory. I think I found part of the code path inside the jdk source which
does this and now I'm trying to determine what are the situations in which
each option is taken.
Can JMX do that? The code I'm looking at is written in pure C.

Amos
On Oct 9, 2012 10:00 PM, "Jonathan Ben Avraham" <yba at tkos.co.il> wrote:

> Hi Amos,
> I did something like this with the JarSigner code in order to reverse
> engineer it in C, which in the end I was able to do. IMHO, gdb is too high
> a granularity to get anything usable out of the JVM execution. I suspect
> that there is no alternative to sowing System.out.print's throughout the
> code.
> Regards,
>
>  - yba
>
>
> On Tue, 9 Oct 2012, Amos Shapira wrote:
>
>  Date: Tue, 9 Oct 2012 10:57:29 +1100
>> From: Amos Shapira <amos.shapira at gmail.com>
>> To: linux-il <linux-il at cs.huji.ac.il>
>> Subject: Looking for directions about compiling and tracing OpenJDK
>>
>> Hi,
>>
>> I have an idea which involves going somewhat deep into the bowls of the
>> Java Jar class loader when using the official Oracle JDK 6 (and soon 7).
>> To verify this I started looking at the JDK source code but it's not
>> small and I'd like to try to trace through it while it executes Java
>> programs.
>>
>> Does anyone here have experience in doing something like this and can
>> give me some useful pointers on how to do this?
>>
>> I'd like to be able to do "gdb java -jar HelloWorld.jar" and single-step
>> through the class loader while it loads HelloWorld.jar.
>>
>> Thanks,
>>
>> --Amos
>>
>>
>>
>>
> --
>  EE 77 7F 30 4A 64 2E C5  83 5F E7 49 A6 82 29 BA    ~. .~   Tk Open
> Systems
> =}----------------------------**--------------------ooO--U--**
> Ooo------------{=
>      - yba at tkos.co.il - tel: +972.2.679.5364, http://www.tkos.co.il -
>
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