RE: Line numbers

[Feng QIAN <fqian@sable.mcgill.ca>]

Line number tables are optional attributes. It is useful for debugging or
when an exception happens. Usually it comes from javac, so one line java
source code may result several bytecodes. But after Soot transformation,
the line number table is not accurate anymore. Currently, Soot tries to
convert the line number table to tags attached to individual jimple
statement, and finally reconstructs the line number table from these tags.
It is obvious that the bytecode is not same as before the transformation.
I do not know how useful the line number is after transformation. Perhaps
you guys will try that.

Cheers,
===========================================================
Feng Qian                             fqian@sable.mcgill.ca

On Fri, 3 May 2002, Stephen Cheng wrote:

> Is the variable table in 1.2.3 as well?
> How would the line table look like after optimisation?
>
> I am trying to find more information about the practical usage of the line
> table and variable table. However all I could find is two pages in the JVM
> Specification. The JVM specification mentioned the possibility of having a
> n-1 mapping between line table entries and a source line (some of Soot
> optimisation could well result in this). However I have never seen this in a
> real class file, and I wonder how the debuggers would behave. I would
> appreciate if you could point me to information/documentation on this topic.
>
> Regards.
> Stephen
>
>
>
> > -----Original Message-----
> > From: owner-soot-list@sable.mcgill.ca
> > [mailto:owner-soot-list@sable.mcgill.ca]On Behalf Of Feng QIAN
> > Sent: 01 May 2002 02:58
> > To: Nathan Kitchen
> > Cc: soot-list@sable.mcgill.ca
> > Subject: Re: Line numbers
> >
> >
> >
> > Line number table will be in release 1.2.3, it was implemented in the last
> > summer.
> >
> > Cheers,
> > ===========================================================
> > Feng Qian                             fqian@sable.mcgill.ca
> >
>