Looking for directions about compiling and tracing OpenJDK

[Amos Shapira]

I was responding to Ira's suggestion to try to use JMX for that.
On Oct 9, 2012 10:22 PM, "Jonathan Ben Avraham" <yba at tkos.co.il> wrote:

> Hi Amos,
> Pardon me, what does the class loader have to do with JMX?
>
>  - yba
>
>
> On Tue, 9 Oct 2012, Amos Shapira wrote:
>
>  Date: Tue, 9 Oct 2012 22:06:16 +1100
>> From: Amos Shapira <amos.shapira at gmail.com>
>> To: Jonathan Ben Avraham <yba at tkos.co.il>
>> Cc: linux-il <linux-il at cs.huji.ac.il>
>> Subject: Re: Looking for directions about compiling and tracing OpenJDK
>>
>>
>> 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-
>>
>>
>>
>>
> --
>  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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