[Soot-list] inter-procedural analysis on an android app

[Bernhard Berger]

Hi Daniela,

afais the problem is that the android apps have a completely different
life-cycle. soot expects the main class to have a main method and
android apps don't have one. You can try to write a dummy main that
creates a new instance of your class and calls all the framework
callbacks (onCreate and so on). Or you tell soot that these methods are
entry points (there is a function to do so).
Maybe you can tell me the results of your tests since I'm also
interested in analysing android apps.

Bernhard

On Di, 2011-01-04 at 19:47 +0000, daniela antonova wrote:
> Hi,
> 
> I would like to write an inter-procedural analysis to analyse Android apps.
> At the moment I am trying to create a call graph for an application.
> The problem is that the app doesn't have a main method and as a result
> I need to define
> entry points other than main method. I could not find an example that
> does that, so
> I would be very grateful for your help.
> 
> This is the code I have so far:
> public static void main(String[] args) {
> 		
> 		List<String> argsList = new ArrayList<String>(Arrays.asList(args));
> 		argsList.addAll(Arrays.asList(new String[]{
> 				"-w",
> 				"-main-class",
> 				"testers.AddressBook2",//main-class
> 				"testers.AddressBook2"//argument classes
> 		}));
> 		
> 		PackManager.v().getPack("wjtp").add(new Transform("wjtp.myTrans",
> new SceneTransformer() {
> 			
> 			@Override
> 			protected void internalTransform(String phaseName, Map options) {
> 				CHATransformer.v().transform();
> 				SootClass a = Scene.v().getSootClass("testers.AddressBook2");
> 				
> 				SootMethod src = Scene.v().getMainClass().getMethodByName("onCreate");
> 				CallGraph cg = Scene.v().getCallGraph();
> 
> 				Iterator<MethodOrMethodContext> targets = new Targets(cg.edgesOutOf(src));
> 				while (targets.hasNext()) {
> 					SootMethod tgt = (SootMethod)targets.next();
> 					System.out.println(src + " may call " + tgt);
> 				}
> 			}
> 
> 		}));
> 
> 		args = argsList.toArray(new String[0]);
> 
> 		soot.Main.main(args);
> 
> I got this from the CallGraph example in the Soot source, but I have
> not been able to modify it so that I could get rid of the exception:
> Exception in thread "main" java.lang.RuntimeException: There is no
> main class set!
> 	at soot.Scene.getMainClass(Scene.java:160)
> 	at soot.EntryPoints.application(EntryPoints.java:65)
> 	at soot.EntryPoints.all(EntryPoints.java:95)
> 	at soot.Scene.getEntryPoints(Scene.java:683)
> 	at soot.Scene.getReachableMethods(Scene.java:730)
> 	at soot.jimple.toolkits.callgraph.CallGraphBuilder.<init>(CallGraphBuilder.java:59)
> 	at soot.jimple.toolkits.callgraph.CHATransformer.internalTransform(CHATransformer.java:42)
> 	at soot.SceneTransformer.transform(SceneTransformer.java:39)
> 	at soot.Transform.apply(Transform.java:89)
> 	at soot.RadioScenePack.internalApply(RadioScenePack.java:57)
> 	at soot.jimple.toolkits.callgraph.CallGraphPack.internalApply(CallGraphPack.java:47)
> 	at soot.Pack.apply(Pack.java:114)
> 	at soot.PackManager.runWholeProgramPacks(PackManager.java:408)
> 	at soot.PackManager.runPacks(PackManager.java:329)
> 	at soot.Main.run(Main.java:198)
> 	at soot.Main.main(Main.java:141)
> 	at RunInterProceduralAnalysis.main(RunInterProceduralAnalysis.java:64)
> 
> Thank you very much for your help!
> Daniela
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-- 
Dipl. Inf. Bernhard Berger

TZI – Universität Bremen, AG Softwaretechnik
E-Mail  berber(at)tzi(dot)de