[Soot-list] want to maintain bytecode offsets for classfiles

[Eric Bodden]

Looking at the source code it seems that it returns the offset from
the original classfile.

Eric

2008/10/5 Manjiri Namjoshi <manjiri.namjoshi at googlemail.com>:
> Hi,
>
> Thanks for your reply !
> Actually i would like to know which bytecode offset does the
> getBytecodeOffset() return ?
> The offset from the original classfile or the transformed classfile?
>
> I am caring about the offset because i want to add method annotations with a
> value as offsets corresponding to only if_cmp instructions !
>
> Thank You.
>
>
> Sincerely,
> Manjiri
>
> 2008/10/4 Eric Bodden <eric.bodden at mail.mcgill.ca>
>>
>> Hi Manjiri.
>>
>> I don't think that what you are looking for is possible. Soot converts
>> bytecode to an intermediate representation called Jimple and then back
>> to bytecode. This is not a 1:1 transformation. You can try to disable
>> some of the phases in the "jb" pack (see here
>> http://www.sable.mcgill.ca/soot/tutorial/phase/index.html) but I don't
>> think that this is going to preserve all the offsets either.
>>
>> Just out of curiosity: Why would you care about the offsets?
>>
>> Eric
>>
>> 2008/10/4 Manjiri Namjoshi <manjiri.namjoshi at googlemail.com>:
>> > Hello,
>> >
>> > I am trying to run a soot transformation and annotate the classfiles.
>> > I observed that the classfiles which the soot produces have different
>> > bytecode offsets than the original bytecode offsets.
>> >
>> > I think soot optimizations is causing this to happen.
>> >
>> > This is the transformation:
>> >        /* adds the transformer. */
>> >         PackManager.v().getPack("jtp").add(new
>> >                         Transform("jtp.annotexample",
>> >                   CreateAnnotationFile.v()));
>> >
>> >         /* invokes Soot */
>> >         soot.Main.main(args);
>> >
>> > I want to somehow suppress these optimizations and maintain the bytecode
>> > offsets.
>> >
>> > Thanks in advance!
>> >
>> > Sincerely,
>> > Manjiri
>> >
>> > _______________________________________________
>> > Soot-list mailing list
>> > Soot-list at sable.mcgill.ca
>> > http://mailman.cs.mcgill.ca/mailman/listinfo/soot-list
>> >
>> >
>>
>>
>>
>> --
>> Eric Bodden
>> Sable Research Group
>> McGill University, Montréal, Canada
>
>



-- 
Eric Bodden
Sable Research Group
McGill University, Montréal, Canada