[Soot-list] Questions about profiler2 example

[Eric Bodden]

Hi Kelvin.

In general it should be possible to create multiple counters that way.
The error that you see has nothing to do with whether you use one
counter or many. It rather has to do with using loadClassAndSupport.

Instead of using loadClassAndSupport("X") I would suggest to...

1.) add the following call just before the call to soot.Main.main(args):

Scene.v().addBasicClass("X");

2.) Then within the internalTransform method, simply access the class via:

Scene.v().getClass("X");

Eric

2009/7/16 Kelvin Tian <kevinn.tian at gmail.com>:
>     I'm using Soot to do some instrumentation, and I've some questions
> related to the profiler2 example, under link
> http://www.sable.mcgill.ca/soot/tutorial/profiler2/index.html ?
>  In this example, I see it use a counter class to add a counter to count the
> number of InvokeStatic statements, and there's only one counter.  If I want
> to create several counters to get different profiling information, can I
> create several instances of counter class and use each instance to count
> different things?
> I tried to do that, coding similarly like below,
> (ie:
>    SootClass counter1 =  Scene.v().loadClassAndSupport("MyCounter");
>    increaseCounter1 = counter1.getMethod("void increase(int)");
>    .....
>    SootClass counter2 =  Scene.v().loadClassAndSupport("MyCounter");
>    increaseCounter2 = counter2.getMethod("void increase(int)");
>    ...
> )
> but I got a lot of runtime errors like this: " Exception in thread "main"
> java.lang.RuntimeException: This operation requires resolving level
> SIGNATURES but MyCounter is at resolving level HIERARCHY  If you are
> extending Soot, try to add the following call before calling soot.Main.main
> "
>
> So I just wonder if this is applicable to create different instances of
> counter class, and if not, are there any better ways to create more than one
> counter? Or do I have to instrument jimple code to manually add counter code
> for each counter I want?  Thanks so much for answers!
>
>
>
> --
> Best regards,
> Kelvin
>
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>



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