private Set<CGNode> findRecursiveMethods(IProgressMonitor progress) throws CancelException {
CallGraph cg = sdg.getCallGraph();
GraphReachability<CGNode, CGNode> reach =
new GraphReachability<CGNode, CGNode>(cg, new TrueFilter());
progress.subTask("Searching recursive methods");
reach.solve(progress);
Set<CGNode> recursive = HashSetFactory.make();
for (CGNode node : cg) {
OrdinalSet<CGNode> rset = reach.getReachableSet(node);
for (CGNode target : rset) {
if (target != node) {
OrdinalSet<CGNode> tset = reach.getReachableSet(target);
if (tset.contains(node)) {
recursive.add(node);
break;
}
}
}
progress.worked(1);
}
progress.done();
return recursive;
}
private Set<CGNode> findLoopingMethods(IProgressMonitor progress) throws CancelException {
CallGraph cg = sdg.getCallGraph();
Set<CGNode> loops = HashSetFactory.make();
progress.subTask("Searching methods with potential endless loops");
for (CGNode node : cg) {
IR ir = node.getIR();
if (ir != null) {
ControlFlowGraph<SSAInstruction, ISSABasicBlock> cfg = ir.getControlFlowGraph();
final boolean ac = Acyclic.isAcyclic(cfg, cfg.entry());
if (!ac && !loopsAreSimple(ir)) {
loops.add(node);
}
} else {
// Conservatively assume that methods may not terminate, iff we dont
// have their code
loops.add(node);
}
progress.worked(1);
}
progress.done();
return loops;
}
private void computeControlDependence(Set<CallNode> nonTerm, IProgressMonitor progress) {
progress.subTask("Compute intraprocedural nontermination sensitive control dependencies");
for (PDG pdg : sdg.getAllContainedPDGs()) {
NumberedGraph<AbstractPDGNode> cfg = SDGControlFlowGraph.create(pdg, false);
for (CallNode call : pdg.getAllCalls()) {
if (nonTerm.contains(call)) {
// add a termination sink to all potential non-terminating calls
AbstractPDGNode art = SDGControlFlowGraph.createArtificialNode();
cfg.addNode(art);
cfg.addEdge(call, art);
}
}
NumberedGraph<AbstractPDGNode> cdg = NTSCDGraph.compute(cfg, pdg.getRoot(), pdg.getExit());
removeArtificialNodes(cdg);
for (AbstractPDGNode from : cdg) {
for (Iterator<? extends AbstractPDGNode> it = cdg.getSuccNodes(from); it.hasNext(); ) {
AbstractPDGNode to = it.next();
pdg.addNonterminationSensitiveControlDependency(from, to);
}
}
progress.worked(1);
}
progress.done();
}
private Set<CallNode> compute(IProgressMonitor progress) throws CancelException {
Set<CallNode> calls = HashSetFactory.make();
Set<CGNode> recursive = findRecursiveMethods(progress);
Set<CGNode> loop = findLoopingMethods(progress);
CallGraph cg = sdg.getCallGraph();
Graph<CGNode> inverted = GraphInverter.invert(cg);
GraphReachability<CGNode, CGNode> reach =
new GraphReachability<CGNode, CGNode>(inverted, new TrueFilter());
progress.subTask("Searching potential non-returning calls");
reach.solve(progress);
Set<CGNode> roots = HashSetFactory.make(loop);
roots.addAll(recursive);
OrdinalSet<CGNode> potential = OrdinalSet.empty();
for (CGNode root : roots) {
OrdinalSet<CGNode> reached = reach.getReachableSet(root);
potential = OrdinalSet.unify(potential, reached);
}
Set<CGNode> terminating = HashSetFactory.make();
Set<CGNode> nonTerminating = HashSetFactory.make();
for (CGNode node : cg) {
if (potential.contains(node)) {
nonTerminating.add(node);
} else {
terminating.add(node);
}
}
for (Call call : sdg.getAllCalls()) {
if (nonTerminating.contains(call.callee.getCallGraphNode())) {
calls.add(call.node);
}
}
progress.done();
computeControlDependence(calls, progress);
return calls;
}
private static Result getOrigSDG(Config cfg, IProgressMonitor progress)
throws IllegalArgumentException, CancelException, PDGFormatException, IOException,
WalaException, InvalidClassFileException {
progress.beginTask(Messages.getString("Analyzer.Task_Prepare_IR"), -1); // $NON-NLS-1$
com.ibm.wala.ipa.callgraph.impl.Util.setNativeSpec(cfg.nativesXML);
progress.subTask(Messages.getString("Analyzer.SubTask_Analysis_Scope")); // $NON-NLS-1$
ClassLoader loader = cfg.getClass().getClassLoader();
AnalysisScope scope = Util.makeAnalysisScope(cfg, loader);
// AnalysisScopeReader.makeJavaBinaryAnalysisScope(cfg.scopeFile, cfg.classpath, null);
progress.done();
ClassHierarchy cha = ClassHierarchy.make(scope, progress);
Iterable<Entrypoint> entrypoints =
com.ibm.wala.ipa.callgraph.impl.Util.makeMainEntrypoints(scope, cha, cfg.mainClass);
AnalysisOptions options = new AnalysisOptions(scope, entrypoints);
AnalysisCache cache = new AnalysisCache();
progress.subTask(
Messages.getString("Analyzer.SubTask_Call_Graph_Builder") + cfg.pointsTo); // $NON-NLS-1$
SSAPropagationCallGraphBuilder builder =
SDGFactory.getCallGraphBuilder(cfg.pointsTo, options, cache, cha, scope);
/**
* Change the wala internal pointer and instancekeyfactory of the callgraph builder to our
* adapter. So we can keep track of the created InstanceKeys and PointerKeys. This information
* is used later on when creating subobject trees for accessed field variables.
*/
InstanceAndPointerKeyFactoryAdapter adapter = null;
InstanceKeyFactory ikFact = builder.getInstanceKeys();
PointerKeyFactory pkFact = builder.getPointerKeyFactory();
adapter = new InstanceAndPointerKeyFactoryAdapter(ikFact, pkFact);
builder.setInstanceKeys(adapter);
builder.setPointerKeyFactory(adapter);
progress.done();
progress.subTask(Messages.getString("Analyzer.SubTask_Call_Graph")); // $NON-NLS-1$
CallGraph cg = builder.makeCallGraph(options, progress);
if (cfg.optimizeCg >= 0) {
CallGraphPruning opt = new CallGraphPruning(cg);
System.out.println("Call Graph has " + cg.getNumberOfNodes() + " Nodes.");
Set<CGNode> sopt = opt.findApplicationNodes(cfg.optimizeCg);
cg = new PrunedCallGraph(cg, sopt);
System.out.println("Optimized Call Graph has " + cg.getNumberOfNodes() + " Nodes.");
}
if (Debug.Var.DUMP_CALLGRAPH.isSet()) {
Util.dumpCallGraph(cg, cfg.mainClass.replace('/', '.').substring(1), progress);
}
if (Debug.Var.DUMP_HEAP_GRAPH.isSet()) {
PointerAnalysis pta = builder.getPointerAnalysis();
HeapGraph hg = pta.getHeapGraph();
Util.dumpHeapGraph(
cfg.mainClass.replace('/', '.').substring(1) + "." + cfg.pointsTo, hg, null);
}
PointerAnalysis pta = builder.getPointerAnalysis();
progress.done();
DemandRefinementPointsTo demandPts = null;
if (cfg.useDemandPts) {
throw new UnsupportedOperationException();
// MemoryAccessMap mam = new PABasedMemoryAccessMap(cg, builder.getPointerAnalysis());
// demandPts = new DemandRefinementPointsTo(cg,
// new ThisFilteringHeapModel(builder,cha), mam, cha, options, getStateMachineFactory());
}
IPointerAnalysis pts = new PointsToWrapper(demandPts, pta);
progress.subTask(Messages.getString("Analyzer.SubTask_Search_Main")); // $NON-NLS-1$
IMethod main =
edu.kit.joana.deprecated.jsdg.util.Util.searchMethod(
entrypoints, "main([Ljava/lang/String;)V"); // $NON-NLS-1$
progress.done();
progress.done();
SDG sdg = SDG.create(main, cg, cache, adapter, pts, cfg, progress);
sdg.setAnalysisScope(scope);
sdg.setPointerAnalysis(pta);
progress.done();
if (Debug.Var.PRINT_FIELD_PTS_INFO.isSet()) {
Log.info("search for field allocs called " + PDG.searchFieldAllocs + " times.");
}
if (Debug.Var.PRINT_UNRESOLVED_CLASSES.isSet()) {
for (TypeReference tRef : cg.getClassHierarchy().getUnresolvedClasses()) {
Log.warn("Could not resolve: " + Util.typeName(tRef.getName()));
}
}
return new Result(null, sdg, cg, pta, null);
}
private static edu.kit.joana.ifc.sdg.graph.SDG createSDG(
CallGraphResult cgResult, AnalysisOptions opt, IMethod method, boolean ignoreExceptions)
throws CancelException, PDGFormatException, WalaException {
DemandRefinementPointsTo demandPts = null;
// if (cfg.useDemandPts) {
// MemoryAccessMap mam = new PABasedMemoryAccessMap(cg, builder.getPointerAnalysis());
// demandPts = new DemandRefinementPointsTo(cg,
// new ThisFilteringHeapModel(builder,cha), mam, cha, options,
// getStateMachineFactory());
// }
IPointerAnalysis pts = new PointsToWrapper(demandPts, cgResult.pts);
IProgressMonitor progress = NullProgressMonitor.INSTANCE;
// new VerboseProgressMonitor(System.out);
IKey2Origin k2o = null;
edu.kit.joana.deprecated.jsdg.SDGFactory.Config cfg =
new edu.kit.joana.deprecated.jsdg.SDGFactory.Config();
cfg.computeSummaryEdges = true;
cfg.useSummaryOpt = false;
cfg.addControlFlow = true;
cfg.computeInterference = false;
cfg.ignoreExceptions = ignoreExceptions;
cfg.optimizeExceptions = false; // !ignoreExceptions;
cfg.nonTermination = false;
cfg.immutables =
new String[] {
"java.lang.String",
"java.lang.Integer",
"java.lang.Float",
"java.lang.Double",
"java.lang.Boolean",
"java.lang.Character"
};
edu.kit.joana.deprecated.jsdg.sdg.SDG jSDG =
edu.kit.joana.deprecated.jsdg.sdg.SDG.create(
method, cgResult.cg, cgResult.cache, k2o, pts, cfg, progress);
edu.kit.joana.ifc.sdg.graph.SDG sdg =
JoanaStyleSDG.createJoanaSDG(
jSDG, cfg.addControlFlow, cfg.nonTermination, cfg.useSummaryOpt, progress);
RemoveLibraryClinits.removeLibraryClinits(sdg);
StaticFieldMerge.mergeStaticFields(sdg);
final Logger log = Log.getLogger(Log.L_WALA_CORE_DEBUG);
if (cfg.computeSummaryEdges) {
progress.subTask("Compute Summary Edges");
log.outln("Compute Summary Edges");
SummaryEdgeComputation.compute(sdg, progress);
log.outln("Summary Edges done.");
progress.done();
}
SummarizeDependencies.transformToSummary(sdg, method);
return sdg;
}