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

[Eric Bodden]

Hi.

I am afraid I don't see what the problem is. Every edge has a source
statement at which it originates, which you can retrieve through
e.srcStmt(), as you did. That's all I meant. Your code looks fine.

Eric

On 19 March 2012 11:29, 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



-- 
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