[Soot-list] Help with NPE PointsToAnalysis.reachingObjects(Context, Local) using Heros/Spark+Geom

[Henddher Pedroza]

Hello, 

Any suggestions?


On May 17, 2013, at 10:58 AM, Henddher Pedroza <hpedro2 at uic.edu> wrote:

> Hello all:
> 
> Using Heros in combination with SPARK w/Geom (*), I am getting an NPE in CallGraph.findEdge(Unit, SootMethod) @ line 123 called from GeomPointsTo.reachingObjects(Context, Local) @ line 1504:
> 
> (*) cmd-line options:
> -p cg all-reachable:true,verbose:true,safe-forname:true,safe-newinstance:true -p cg.spark enabled:true,verbose:true,geom-pta:true,geom-eval:2
> 
> GeomPointsTo.reachingObjects(Context, Local):
> 1504: Edge e = Scene.v().getCallGraph().findEdge((Unit)c, callee);
> 
> CallGraph.findEdge(Unit, SootMethod): 
>     Edge findEdge( Unit u, SootMethod callee )
>     {
>     	Edge e = srcUnitToEdge.get(u);
> 123: 	while ( e.srcUnit() == u && // <<<< NPE, e is null
> 
> For my test, I am using one explicit entry point, discarding all default entry-points configured by Soot.
> My entry-point is a static method (staticFakeEntryPoint) which instantiates one obj of the class I am testing. Then, in my interesting method doSomething(), I perform a field assignment and request PointsToAnalysis.reachingObjects(Context, Local) (see "<<<<" below). Context is the current statement "stmt" (r0.<MyClass: java.lang.String dummy> = $r3) and Local is "r0" (obtained through stmt.getDefBoxes().getValue().getBase() more or less)
> 
> MyClass {
>    String dummy;
>    void static staticFakeEntryPoint() {
>       MyClass anObj = new MyClass();
>       anObj.doSomething();
>    }
>    void doSomething() {
>      this.dummy = doSomethingElse(); // <<<< jimple: r0.<MyClass: java.lang.String dummy> = $r3
>    }
> }
> 
> Am I incorrectly using pointsToAnalysis.reachingObjects(Context, Local) or incorrectly configuring Spark?
> 
> Why would srcUnitToEdge be lacking that edge?
> 
> Any help is appreciated.
> 
> - Henddher  

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