TaintPropagationHandler: Do not use intermediate sets

soot-infoflow-summaries/src/soot/jimple/infoflow/methodSummary/handler/SummaryTaintPropagationHandler.java

@@ -1,6 +1,5 @@
 package soot.jimple.infoflow.methodSummary.handler;
 
-import java.util.Collections;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.Set;
@@ -201,16 +200,18 @@ protected void addResult(Abstraction abs, Stmt stmt) {
 	}
 
 	@Override
-	public Set<Abstraction> notifyFlowOut(Unit u, Abstraction d1, Abstraction incoming, Set<Abstraction> outgoing,
+	public boolean notifyFlowOut(Unit u, Abstraction d1, Abstraction incoming, Set<Abstraction> outgoing,
 			InfoflowManager manager, FlowFunctionType type) {
 		// Do not propagate through excluded methods
 		SootMethod sm = manager.getICFG().getMethodOf(u);
-		if (excludedMethods.contains(sm))
-			return Collections.emptySet();
-		if (type == FlowFunctionType.ReturnFlowFunction && !followReturnsPastSeeds && sm == method)
-			return Collections.emptySet();
-
-		return outgoing;
+		if (excludedMethods.contains(sm)) {
+			return true;
+		}
+		if (type == FlowFunctionType.ReturnFlowFunction && !followReturnsPastSeeds && sm == method) {
+			outgoing.clear();
+			return true;
+		}
+		return false;
 	}
 
 	public MultiMap<Abstraction, Stmt> getResult() {

soot-infoflow/src/soot/jimple/infoflow/collections/strategies/widening/WideningTaintPropagationHandler.java

@@ -1,6 +1,8 @@
 package soot.jimple.infoflow.collections.strategies.widening;
 
-import java.util.HashSet;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
 import java.util.Set;
 import java.util.function.Function;
 
@@ -37,22 +39,23 @@ public void notifyFlowIn(Unit stmt, Abstraction taint, InfoflowManager manager,
 	}
 
 	@Override
-	public Set<Abstraction> notifyFlowOut(Unit stmt, Abstraction d1, Abstraction incoming, Set<Abstraction> outgoing,
+	public boolean notifyFlowOut(Unit stmt, Abstraction d1, Abstraction incoming, Set<Abstraction> outgoing,
 			InfoflowManager manager, FlowFunctionType type) {
 		if (type != FlowFunctionType.CallToReturnFlowFunction)
-			return outgoing;
+			return false;
 
-		Set<Abstraction> newOutgoing = outgoing;
 		WideningStrategy<Unit, Abstraction> wideningStrategy = getWideningStrategy(manager);
-		for (Abstraction abs : outgoing) {
+		List<Abstraction> toAdd = new ArrayList<>();
+		Iterator<Abstraction> it = outgoing.iterator();
+		while (it.hasNext()) {
+			Abstraction abs = it.next();
 			Abstraction widened = wideningStrategy.widen(incoming, abs, stmt);
 			if (widened != abs) {
-				if (newOutgoing == outgoing)
-					newOutgoing = new HashSet<>(outgoing);
-				newOutgoing.add(widened);
-				newOutgoing.remove(abs);
+				toAdd.add(widened);
+				it.remove();
 			}
 		}
-		return newOutgoing;
+		outgoing.addAll(toAdd);
+		return false;
 	}
 }

soot-infoflow/src/soot/jimple/infoflow/data/pathBuilders/ContextSensitivePathBuilder.java

@@ -220,10 +220,10 @@ protected boolean checkForSource(Abstraction abs, SourceContextAndPath scap) {
 
 		// A source should normally never have neighbors, but it can happen
 		// with ICCTA
-		if (abs.getNeighbors() != null) {
-			// we ignore this issue for now, because the neighbor's source
-			// contexts seem to be equal to our own one
-		}
+		//if (abs.getNeighbors() != null) {
+		// we ignore this issue for now, because the neighbor's source
+		// contexts seem to be equal to our own one
+		//}
 
 		// Register the source that we have found
 		SourceContext sourceContext = abs.getSourceContext();

soot-infoflow/src/soot/jimple/infoflow/handlers/SequentialTaintPropagationHandler.java

@@ -1,7 +1,6 @@
 package soot.jimple.infoflow.handlers;
 
 import java.util.ArrayList;
-import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
 
@@ -63,18 +62,17 @@ public void notifyFlowIn(Unit stmt, Abstraction taint, InfoflowManager manager,
 	}
 
 	@Override
-	public Set<Abstraction> notifyFlowOut(Unit stmt, Abstraction d1, Abstraction incoming, Set<Abstraction> outgoing,
+	public boolean notifyFlowOut(Unit stmt, Abstraction d1, Abstraction incoming, Set<Abstraction> outgoing,
 			InfoflowManager manager, FlowFunctionType type) {
 		if (innerHandlers.isEmpty())
-			return outgoing;
+			return false;
 
-		Set<Abstraction> resultSet = new HashSet<>();
+		boolean killed = false;
 		for (TaintPropagationHandler handler : innerHandlers) {
-			Set<Abstraction> handlerResults = handler.notifyFlowOut(stmt, d1, incoming, outgoing, manager, type);
-			if (handlerResults != null && !handlerResults.isEmpty())
-				resultSet.addAll(handlerResults);
+			if (handler.notifyFlowOut(stmt, d1, incoming, outgoing, manager, type))
+				killed = true;
 		}
-		return resultSet;
+		return killed;
 	}
 
 	/**

soot-infoflow/src/soot/jimple/infoflow/handlers/TaintPropagationHandler.java

@@ -53,11 +53,9 @@ public enum FlowFunctionType {
 	 *            The manager object that gives access to the data flow engine
 	 * @param type
 	 *            The type of data flow edge being processed
-	 * @return The new abstractions to be propagated on. If you do not want to
-	 *         change the normal propagation behavior, just return the value of the
-	 *         "taints" parameter as-is.
+	 * @return Whether to kill the outgoing set
 	 */
-	public Set<Abstraction> notifyFlowOut(Unit stmt, Abstraction d1, Abstraction incoming, Set<Abstraction> outgoing,
+	public boolean notifyFlowOut(Unit stmt, Abstraction d1, Abstraction incoming, Set<Abstraction> outgoing,
 			InfoflowManager manager, FlowFunctionType type);
 
 }

soot-infoflow/src/soot/jimple/infoflow/problems/AbstractInfoflowProblem.java

@@ -42,16 +42,14 @@
 import soot.jimple.infoflow.taintWrappers.ITaintPropagationWrapper;
 import soot.jimple.infoflow.util.SystemClassHandler;
 import soot.jimple.toolkits.ide.DefaultJimpleIFDSTabulationProblem;
-import soot.jimple.toolkits.ide.icfg.BiDiInterproceduralCFG;
 
 /**
  * abstract super class which - concentrates functionality used by
  * InfoflowProblem and AliasProblem - contains helper functions which should not
  * pollute the naturally large InfofflowProblems
  *
  */
-public abstract class AbstractInfoflowProblem
-		extends DefaultJimpleIFDSTabulationProblem<Abstraction, IInfoflowCFG> {
+public abstract class AbstractInfoflowProblem extends DefaultJimpleIFDSTabulationProblem<Abstraction, IInfoflowCFG> {
 
 	protected final InfoflowManager manager;
 
@@ -321,8 +319,11 @@ protected boolean isExceptionHandler(Unit u) {
 	 */
 	protected Set<Abstraction> notifyOutFlowHandlers(Unit stmt, Abstraction d1, Abstraction incoming,
 			Set<Abstraction> outgoing, FlowFunctionType functionType) {
-		if (taintPropagationHandler != null && outgoing != null && !outgoing.isEmpty())
-			outgoing = taintPropagationHandler.notifyFlowOut(stmt, d1, incoming, outgoing, manager, functionType);
+		if (taintPropagationHandler != null && outgoing != null && !outgoing.isEmpty()) {
+			boolean res = taintPropagationHandler.notifyFlowOut(stmt, d1, incoming, outgoing, manager, functionType);
+			if (res)
+				return null;
+		}
 		return outgoing;
 	}
 

soot-infoflow/src/soot/jimple/infoflow/results/InfoflowResults.java

@@ -171,8 +171,7 @@ public Collection<Pair<ResultSourceInfo, ResultSinkInfo>> addResult(
 		if (propagationPath != null) {
 			stmtPath = new ArrayList<>(propagationPath.size());
 			apPath = new ArrayList<>(propagationPath.size());
-			if (!manager.getConfig().getPathAgnosticResults())
-				csPath = new ArrayList<>(propagationPath.size());
+			csPath = new ArrayList<>(propagationPath.size());
 			for (Abstraction pathAbs : propagationPath) {
 				if (pathAbs.getCurrentStmt() != null) {
 					stmtPath.add(pathAbs.getCurrentStmt());

soot-infoflow/src/soot/jimple/infoflow/river/SecondaryFlowGenerator.java

@@ -5,7 +5,10 @@
 import java.util.Set;
 
 import heros.solver.PathEdge;
-import soot.*;
+import soot.RefType;
+import soot.Unit;
+import soot.Value;
+import soot.ValueBox;
 import soot.jimple.InstanceInvokeExpr;
 import soot.jimple.Stmt;
 import soot.jimple.infoflow.InfoflowManager;
@@ -52,15 +55,15 @@ public void notifyFlowIn(Unit stmt, Abstraction taint, InfoflowManager manager,
 	}
 
 	@Override
-	public Set<Abstraction> notifyFlowOut(Unit unit, Abstraction d1, Abstraction incoming, Set<Abstraction> outgoing,
+	public boolean notifyFlowOut(Unit unit, Abstraction d1, Abstraction incoming, Set<Abstraction> outgoing,
 			InfoflowManager manager, FlowFunctionType type) {
 		// We only need to handle CallToReturn edges
 		if (type != FlowFunctionType.CallToReturnFlowFunction)
-			return outgoing;
+			return false;
 
 		// Check whether any use matches the incoming taint
 		if (!isReadAt(unit, incoming.getAccessPath()))
-			return outgoing;
+			return false;
 
 		ensureCondFlowManager(manager);
 
@@ -82,15 +85,15 @@ public Set<Abstraction> notifyFlowOut(Unit unit, Abstraction d1, Abstraction inc
 		}
 
 		// Check for usage contexts
-		for (AdditionalFlowInfoSpecification spec : manager.getUsageContextProvider().needsAdditionalInformation(stmt, outgoing))
+		for (AdditionalFlowInfoSpecification spec : manager.getUsageContextProvider().needsAdditionalInformation(stmt,
+				outgoing))
 			additionalAbsSet.add(createAdditionalFlowAbstraction(spec, stmt, manager));
 
 		// Query the backward analysis
 		for (Abstraction addAbs : additionalAbsSet)
 			for (Unit pred : manager.getICFG().getPredsOf(unit))
 				manager.additionalManager.getMainSolver().processEdge(new PathEdge<>(d1, pred, addAbs));
-
-		return outgoing;
+		return false;
 	}
 
 	/**
@@ -117,7 +120,8 @@ protected Abstraction createAdditionalFlowAbstraction(Abstraction baseTaint, Stm
 	 * @param manager Infoflow Manager
 	 * @return New abstraction
 	 */
-	protected Abstraction createAdditionalFlowAbstraction(AdditionalFlowInfoSpecification spec, Stmt stmt, InfoflowManager manager) {
+	protected Abstraction createAdditionalFlowAbstraction(AdditionalFlowInfoSpecification spec, Stmt stmt,
+			InfoflowManager manager) {
 		AccessPath ap = spec.toAccessPath(manager);
 		ISourceSinkDefinition def = spec.getDefinition();
 		Abstraction newAbs = new Abstraction(Collections.singleton(def), ap, stmt, null, false, false);

soot-infoflow/src/soot/jimple/infoflow/river/SecondaryFlowListener.java

@@ -7,8 +7,8 @@
 import soot.jimple.infoflow.InfoflowManager;
 import soot.jimple.infoflow.data.Abstraction;
 import soot.jimple.infoflow.handlers.TaintPropagationHandler;
-import soot.jimple.infoflow.problems.rules.PropagationRuleManager;
 import soot.jimple.infoflow.problems.rules.ITaintPropagationRule;
+import soot.jimple.infoflow.problems.rules.PropagationRuleManager;
 
 /**
  * TaintPropagationHandler to record which statements secondary flows reach.
@@ -37,7 +37,8 @@ private void ensureSourcePropagationRule(InfoflowManager manager) {
 			}
 		}
 
-		throw new IllegalStateException("Enabled additional flows but no IConditionalFlowSinkPropagationRule in place!");
+		throw new IllegalStateException(
+				"Enabled additional flows but no IConditionalFlowSinkPropagationRule in place!");
 	}
 
 	@Override
@@ -59,10 +60,10 @@ public void notifyFlowIn(Unit unit, Abstraction incoming, InfoflowManager manage
 	}
 
 	@Override
-	public Set<Abstraction> notifyFlowOut(Unit stmt, Abstraction d1, Abstraction incoming, Set<Abstraction> outgoing,
+	public boolean notifyFlowOut(Unit stmt, Abstraction d1, Abstraction incoming, Set<Abstraction> outgoing,
 			InfoflowManager manager, FlowFunctionType type) {
 		// NO-OP
-		return outgoing;
+		return false;
 	}
 
 }

soot-infoflow/src/soot/jimple/infoflow/util/DebugFlowFunctionTaintPropagationHandler.java

@@ -55,10 +55,10 @@ public void notifyFlowIn(Unit stmt, Abstraction taint, InfoflowManager manager,
 	}
 
 	@Override
-	public Set<Abstraction> notifyFlowOut(Unit stmt, Abstraction d1, Abstraction incoming, Set<Abstraction> outgoing,
+	public boolean notifyFlowOut(Unit stmt, Abstraction d1, Abstraction incoming, Set<Abstraction> outgoing,
 			InfoflowManager manager, FlowFunctionType type) {
 		if (this.filter != null && !this.filter.evaluate(manager.getICFG().getMethodOf(stmt).toString()))
-			return outgoing;
+			return false;
 
 		String typeString = "";
 		switch (type) {
@@ -88,7 +88,7 @@ public Set<Abstraction> notifyFlowOut(Unit stmt, Abstraction d1, Abstraction inc
 		} else
 			System.out.println(this.prefix + " " + typeString + " @ " + stmt + ":\n\tIn: " + incoming + "\n\tOut: "
 					+ outgoing + "\n");
+		return false;
 
-		return outgoing;
 	}
 }

soot-infoflow/test/soot/jimple/infoflow/test/junit/HeapTests.java

@@ -1309,8 +1309,8 @@ public void notifyFlowIn(Unit stmt, Abstraction taint, InfoflowManager manager,
 			}
 
 			@Override
-			public Set<Abstraction> notifyFlowOut(Unit stmt, Abstraction d1, Abstraction incoming, Set<Abstraction> outgoing, InfoflowManager manager, FlowFunctionType type) {
-				return outgoing;
+			public boolean notifyFlowOut(Unit stmt, Abstraction d1, Abstraction incoming, Set<Abstraction> outgoing, InfoflowManager manager, FlowFunctionType type) {
+				return false;
 			}
 		});
 		epoints.add("<soot.jimple.infoflow.test.HeapTestCode: void identityStmtIsNotAGoodHandoverPoint()>");