[Soot-list] Callgraphs, CHATransformer

[Marco Bakera]

I did not try to use another VM yet but were able to pinpoint the 
problem. It only occurs, when trying to analyze a static inner class.

Maybe this helps for you.


Greetings,
Marco.


Eric Bodden schrieb am 2009-02-18 18:45:
> To me this seems to be a bug in Sun's JVM. There is no call to
> System.exit(..). Yet, as you wrote, the call to
> CallGraphBuilder.build() never returns.
> 
> I have seen such behavior on Sun JVMs before. Could you try another
> VM, e.g. IBM's J9?
> 
> Eric
> 
> 2009/2/18 Marco Bakera <marco.bakera at tu-dortmund.de>:
>> Hi Eric,
>>
>> thank you for the fast answer. I tried the following code but again Soot exits
>> when invoking the main method. Further, I was not able to see the scene
>> transformer's internalTransform method being invoked.
>>
>> Could you please tell me what is the problem with my simple implementation?
>>
>>
>> public class CallGraphGenerationTest {
>>
>>        @Test
>>        public void testCallGraphGeneration() throws Exception {
>>                G.reset();
>>
>>                CallGraphFetcher callGraphFetcher = new CallGraphFetcher();
>>                PackManager.v().getPack("wjtp").add(new Transform("wjtp.cgfetcher",
>> callGraphFetcher));
>>
>>                String args = "-w " + OmgClass.class.getName();
>>                System.out.println("CallGraphGenerationTest.testCallGraphGeneration()
>> invoking soot with "+args);
>>                Main.main(args.split(" "));
>>        }
>>
>>        private static class CallGraphFetcher extends SceneTransformer {
>>
>>                private CallGraph callGraph;
>>
>>                @Override
>>                protected void internalTransform(String phaseName, Map options) {
>>                        System.out.println("CallGraphFetcher.internalTransform() fetching call
>> graph from scene");
>>                        this.callGraph = Scene.v().getCallGraph();
>>                }
>>
>>                public CallGraph getCallGraph() {
>>                        return callGraph;
>>                }
>>        }
>>
>>        private static class OmgClass {
>>
>>                private int a;
>>                private int b;
>>                @SuppressWarnings("unused")
>>                private int stop;
>>
>>                public OmgClass(int a, int b) {
>>                        this.a = a;
>>                        this.b = b;
>>                }
>>
>>                public void omfg(int c) {
>>                        for (int i=a; i<c; i++) {
>>                                System.out.println(c+b);
>>                                omfg(--c);
>>                        }
>>                }
>>
>>                public static void main(String[] args){
>>                        OmgClass it = new OmgClass(1, 10);
>>                        it.omfg(6);
>>                }
>>        }
>> }
>>
>>
>> Best regards,
>> Marco.
>>
>> On Wednesday 18 February 2009 15:21:03 Eric Bodden wrote:
>>> Hi.
>>>
>>> At the point at which you call transform(), nothing at all has been
>>> initialized. You should put your call to transform() into a
>>> SceneTransformer, preferably within the wjtp pack. Then you have to
>>> call Soot's main method. This will automatically take care of parsing
>>> the command line, initializing Soot accordingly and then calling your
>>> transformer.
>>>
>>> You may want to look at our tutorials, especially into this one here
>>> that explains the various packs and also how to insert a transform:
>>> http://www.bodden.de/2008/11/26/soot-packs/
>>>
>>> Eric
>>>
>>> 2009/2/18 André Lobitz <andre-lobitz at gmx.de>:
>>>> I am trying to create callgraphs using soot. Therefore i've added the
>>>> Soot-classes.jar to my library list and written a small class (see
>>>> below). I am only getting the error message
>>>>     [Call Graph] For information on where the call graph may be
>>>> incomplete, use the verbose option to the cg phase.
>>>> and a NullPointerException. It seems to be the call
>>>>     CHATransformer.v().transform();
>>>> throwing the Exception. Can anyone help me?
>>>>
>>>> Thanx,
>>>> André
>>>>
>>>> -------------------------------------------------------------------------
>>>> --------------------------------------------------------------------------
>>>> -----------------
>>>>
>>>> package diplom.main;
>>>>
>>>> import soot.jimple.toolkits.callgraph.*;
>>>> import java.util.Iterator;
>>>> import soot.Scene;
>>>> import soot.SootClass;
>>>> import soot.SootMethod;
>>>> import soot.options.Options;
>>>>
>>>> public class SootTest {
>>>>
>>>>     public static void main(String[] args) {
>>>>         CHATransformer.v().transform();
>>>>
>>>>         Options.v().set_whole_program(true);
>>>>         SootClass mainClass =
>>>> Scene.v().loadClassAndSupport("diplom.testers.omg");
>>>>         mainClass.setApplicationClass();
>>>>         Scene.v().setMainClass(mainClass);
>>>>
>>>>         SootMethod src = mainClass.getMethodByName("main");
>>>>         CallGraph cg = Scene.v().getCallGraph();
>>>>         Iterator targets = new Targets(cg.edgesOutOf(src));
>>>>         while (targets.hasNext()) {
>>>>             SootMethod tgt = (SootMethod) targets.next();
>>>>             System.out.println(src + " may call " + tgt);
>>>>         }
>>>>     }
>>>> }
>>>> -------------------------------------------------------------------------
>>>> --------------------------------------------------------------------------
>>>> -----------------
>>>>
>>>> package diplom.testers;
>>>>
>>>> public class omg {
>>>>
>>>>     int a;
>>>>     int b;
>>>>     int stop;
>>>>
>>>>     public omg(int a, int b){
>>>>         this.a = a;
>>>>         this.b = b;
>>>>     }
>>>>
>>>>     public void omfg(int c){
>>>>         for (int i=a; i<c; i++){
>>>>             System.out.println(c+b);
>>>>             omfg(--c);
>>>>         }
>>>>     }
>>>>
>>>>     public static void main(String[] args){
>>>>         omg it = new omg(1, 10);
>>>>         it.omfg(6);
>>>>     }
>>>>
>>>> }
>>>>