[Soot-list] Spark missing call edge when call self method

[cl0und]

Hi, I found spark missing call edge when call self method.The details are as follows

A.java

```

public class A {

    public void method1(){

        method2();

        new B().method2();

    }

    public void method2(){

        System.out.println("A method2");

    }

}

```

B.java

```

public class B {

    public void method2(){

        System.out.println("B method2");

    }

}

```

Main.java

```

String processDir = "/path/to/classes";

ArrayList<String> set_process_dir = new ArrayList<String>();

set_process_dir.add(processDir);

Options.v().set_process_dir(set_process_dir);

Options.v().set_whole_program(true);

Options.v().set_allow_phantom_refs(true);

Options.v().set_output_format(Options.output_format_none);

Scene.v().loadNecessaryClasses();

List<SootMethod> entryPoints = new ArrayList();

SootMethod sm = Scene.v().getSootClass("A").getMethodByName("method1");

entryPoints.add(sm);

Scene.v().setEntryPoints(entryPoints);

PackManager.v().runPacks();

Iterator<Unit> units = Scene.v().getSootClass("A").getMethodByName("method1").getActiveBody().getUnits().iterator();

while (units.hasNext()){

    Unit unit = units.next();

    Iterator targets = new Targets(Scene.v().getCallGraph().edgesOutOf(unit));

    while (targets.hasNext()){

        SootMethod tgt = (SootMethod) targets.next();

        System.out.println(unit + " may call " + tgt);

    }

}

```

when I run Main.java the output is 

```

specialinvoke $r1.<B: void <init>()>() may call <B: void <init>()>

virtualinvoke $r1.<B: void method2()>() may call <B: void method2()>

``` 

You can see It loses the calling side A.method1 to A.method2.

But when I comment out the option about spark，the outpout is complete

```

//        Options.v().setPhaseOption("cg.spark", "on");

//        Options.v().setPhaseOption("cg.spark", "enabled:true");

//        Options.v().setPhaseOption("cg.spark", "propagator:worklist");

//        Options.v().setPhaseOption("cg.spark", "on-fly-cg:true");

//output

virtualinvoke r0.<A: void method2()>() may call <A: void method2()>

specialinvoke $r1.<B: void <init>()>() may call <B: void <init>()>

virtualinvoke $r1.<B: void method2()>() may call <B: void method2()>

```

So there is a way to get the complete call side，when use spark？

Thank you for taking the time.

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