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 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;
}
