[Soot-list] Is there a way to get the object whose method is being called?

[Cheng Zhang]

Hi,

Sorry, I have no idea about the main problem either...

But for the class cast exception, I guess the method call
Clarissa wants to process is a static invocation, instead of an instance
invocation,
so the expression is of type:  soot.jimple.internal.JStaticInvokeExpr

Perhaps it would be better to read a bit about Jimple specs before doing it:
http://www.sable.mcgill.ca/publications/techreports/sable-tr-1998-4.ps

Best,
Cheng

On Mon, Mar 19, 2012 at 6:29 PM, Clarissa Grixti
<clarissa_14_4 at hotmail.com>wrote:

>  Hey eric,
>
> When you said  the call statement of the call edge, did you mean that you
> need the edge containing the statement in the source part?
> So for example I have the flow :
>
> doStuff -> label. setText
>
> and so the variable that I need is label. However setText does not point
> to any other methods, and so no edge will result from there. Now I tried
> the following code (this will be called after I call the CHATransformer):
>
>  public static void method1() {
>         SootMethod src =
> Scene.v().getMainClass().getMethodByName("doStuff");
>         CallGraph cg = Scene.v().getCallGraph();
>
>         Iterator<Edge> edges = cg.edgesOutOf(src);
>         while (edges.hasNext()) {
>             Edge e = edges.next();
>             Stmt stmt = e.srcStmt();
>
>             InvokeExpr ie = stmt.getInvokeExpr();
>
>             InstanceInvokeExpr iie = (InstanceInvokeExpr)ie;
>             Value v = iie.getBase();
>
>             System.out.println("TYPE: " + v.getType().toString());
>         }
>
>     }
>
> Stmt can only be retrieved from that method, and I'm assuming that in this
> case, since the egde will is from doStuff to some other method, than the
> statement in stmt will be that of doStuff. But if setText does not point to
> a method, how will I be able to get the srcStmt?
>
> In addition when I tried to cast the invoke expression, im getting the
> following exception:  Exception in thread "main"
> java.lang.ClassCastException: soot.jimple.internal.JStaticInvokeExpr cannot
> be cast to soot.jimple.InstanceInvokeExpr. should it be casted in some
> other way?
>
> Thanks for the help and regards
>
>
>
> > From: eric.bodden at ec-spride.de
> > Date: Sun, 18 Mar 2012 16:02:33 +0100
> > Subject: Re: [Soot-list] Is there a way to get the object whose method
> is being called?
> > To: clarissa_14_4 at hotmail.com
> > CC: soot-list at sable.mcgill.ca
>
> >
> > Hi Clarissa.
> >
> > As Zheng wrote, you cannot determine the object. But possible what you
> > actually mean is the variable holding that object at runtime. In this
> > case you can get a handle to this variable as follows:
> >
> > 1.) extract the call statement from the call edge
> > 2.) on this stmt perform stmt.getInvokeExpr() to extract the invoke
> expression
> > 3.) cast this invoke expression to an InstanceInvokeExpr on which you
> > can then call getBase()
> > 4.) getBase() returns a value, which you should be able to cast to a
> > local variable
> >
> > Cheers,
> > Eric
> >
> > On 18 March 2012 15:09, Clarissa Grixti <clarissa_14_4 at hotmail.com>
> wrote:
> > > Hey all,
> > >
> > >  I am creating a call graph for my system in order to be able to get
> the
> > > target nodes for a particular method. Is there a way to be able to
> identify
> > > the object whose method is being called? I did manage to get the
> declaring
> > > class for the method, but what I need is the actual object calling a
> > > specific method.
> > >
> > > Thanks and regards
> > >
> > > _______________________________________________
> > > Soot-list mailing list
> > > Soot-list at sable.mcgill.ca
> > > http://mailman.cs.mcgill.ca/mailman/listinfo/soot-list
> > >
> >
> >
> >
> > --
> > Eric Bodden, Ph.D., http://bodden.de/
> > Head of Secure Software Engineering Group at EC SPRIDE
> > Principal Investigator in Secure Services at CASED
> > Tel: +49 6151 16-75422    Fax: +49 6151 16-72051
> > Room 3.2.14, Mornewegstr. 30, 64293 Darmstadt
>
> _______________________________________________
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>
>
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