// 2) construct lattices
inferLattices();
+ simplifyLattices();
+
debug_writeLatticeDotFile();
// 3) check properties
}
+ private void simplifyLattices() {
+
+ // generate lattice dot file
+ setupToAnalyze();
+
+ while (!toAnalyzeIsEmpty()) {
+ ClassDescriptor cd = toAnalyzeNext();
+
+ setupToAnalazeMethod(cd);
+
+ SSJavaLattice<String> classLattice = cd2lattice.get(cd);
+ if (classLattice != null) {
+ classLattice.removeRedundantEdges();
+ }
+
+ while (!toAnalyzeMethodIsEmpty()) {
+ MethodDescriptor md = toAnalyzeMethodNext();
+ if (ssjava.needTobeAnnotated(md)) {
+ SSJavaLattice<String> methodLattice = md2lattice.get(md);
+ if (methodLattice != null) {
+ methodLattice.removeRedundantEdges();
+ }
+ }
+ }
+ }
+
+ }
+
private void checkLattices() {
LinkedList<MethodDescriptor> descriptorListToAnalyze = ssjava.getSortedDescriptors();
SSJavaLattice<String> classLattice = cd2lattice.get(cd);
if (classLattice != null) {
ssjava.writeLatticeDotFile(cd, null, classLattice);
+ debug_printDescriptorToLocNameMapping(cd);
}
while (!toAnalyzeMethodIsEmpty()) {
SSJavaLattice<String> methodLattice = md2lattice.get(md);
if (methodLattice != null) {
ssjava.writeLatticeDotFile(cd, md, methodLattice);
+ debug_printDescriptorToLocNameMapping(md);
}
}
}
}
+ private void debug_printDescriptorToLocNameMapping(Descriptor desc) {
+
+ LocationInfo info = getLocationInfo(desc);
+ System.out.println("## " + desc + " ##");
+ System.out.println(info.getMapDescToInferLocation());
+ LocationInfo locInfo = getLocationInfo(desc);
+ System.out.println("mapping=" + locInfo.getMapLocSymbolToDescSet());
+ System.out.println("###################");
+
+ }
+
private void inferLattices() {
// do fixed-point analysis
SSJavaLattice<String> methodLattice =
new SSJavaLattice<String>(SSJavaAnalysis.TOP, SSJavaAnalysis.BOTTOM);
+ MethodLocationInfo methodInfo = new MethodLocationInfo(md);
+
System.out.println();
System.out.println("SSJAVA: Inferencing the lattice from " + md);
- analyzeMethodLattice(md, methodLattice);
+ analyzeMethodLattice(md, methodLattice, methodInfo);
SSJavaLattice<String> prevMethodLattice = getMethodLattice(md);
+ MethodLocationInfo prevMethodInfo = getMethodLocationInfo(md);
- if (!methodLattice.equals(prevMethodLattice)) {
+ if ((!methodLattice.equals(prevMethodLattice)) || (!methodInfo.equals(prevMethodInfo))) {
setMethodLattice(md, methodLattice);
+ setMethodLocInfo(md, methodInfo);
// results for callee changed, so enqueue dependents caller for
// further analysis
}
+ private void setMethodLocInfo(MethodDescriptor md, MethodLocationInfo methodInfo) {
+ mapMethodDescToMethodLocationInfo.put(md, methodInfo);
+ }
+
private void checkLatticesOfVirtualMethods(MethodDescriptor md) {
if (!md.isStatic()) {
for (Iterator iterator2 = paramLocNameSet1.iterator(); iterator2.hasNext();) {
String locName2 = (String) iterator2.next();
- // System.out.println("COMPARE " + locName1 + " - " + locName2 + " "
- // + lattice1.isGreaterThan(locName1, locName2) + "-"
- // + lattice2.isGreaterThan(locName1, locName2));
if (!locName1.equals(locName2)) {
return desc;
}
- private void analyzeMethodLattice(MethodDescriptor md, SSJavaLattice<String> methodLattice) {
-
- MethodLocationInfo methodInfo = getMethodLocationInfo(md);
+ private void analyzeMethodLattice(MethodDescriptor md, SSJavaLattice<String> methodLattice,
+ MethodLocationInfo methodInfo) {
// first take a look at method invocation nodes to newly added relations
// from the callee
analyzeLatticeMethodInvocationNode(md);
+ // grab the this location if the method use the 'this' reference
+ String thisLocSymbol = md.getThis().getSymbol();
+ // if (methodLattice.getKeySet().contains(thisLocSymbol)) {
+ methodInfo.setThisLocName(thisLocSymbol);
+ // }
+
// visit each node of method flow graph
FlowGraph fg = getFlowGraph(md);
Set<FlowNode> nodeSet = fg.getNodeSet();
ClassDescriptor varClassDesc = varDesc.getType().getClassDesc();
extractRelationFromFieldFlows(varClassDesc, srcNode, dstNode, 1);
- } else {
+ } else if (srcNodeTuple.size() == 1 || dstNodeTuple.size() == 1) {
// for the method lattice, we need to look at the first element of
// NTuple<Descriptor>
- if (srcNodeTuple.size() == 1 || dstNodeTuple.size() == 1) {
+ // in this case, take a look at connected nodes at the local level
+ addRelationToLattice(md, methodLattice, methodInfo, srcNode, dstNode);
+ } else {
+
+ if (!srcNode.getDescTuple().get(0).equals(dstNode.getDescTuple().get(0))) {
// in this case, take a look at connected nodes at the local level
- addRelationToLattice(md, methodLattice, srcNode, dstNode);
+ addRelationToLattice(md, methodLattice, methodInfo, srcNode, dstNode);
+ } else {
+ Descriptor srcDesc = srcNode.getDescTuple().get(0);
+ Descriptor dstDesc = dstNode.getDescTuple().get(0);
+ recursivelyAddCompositeRelation(md, fg, methodInfo, srcNode, dstNode, srcDesc,
+ dstDesc);
+ // recursiveAddRelationToLattice(1, md, srcNode, dstNode);
}
}
}
}
- // grab the this location if the method use the 'this' reference
- String thisLocSymbol = md.getThis().getSymbol();
- if (methodLattice.getKeySet().contains(thisLocSymbol)) {
- methodInfo.setThisLocName(thisLocSymbol);
- }
-
// calculate a return location
if (!md.getReturnType().isVoid()) {
Set<FlowNode> returnNodeSet = fg.getReturnNodeSet();
}
+ private void recursiveAddRelationToLattice(int idx, MethodDescriptor md,
+ CompositeLocation srcInferLoc, CompositeLocation dstInferLoc) {
+
+ String srcLocSymbol = srcInferLoc.get(idx).getLocIdentifier();
+ String dstLocSymbol = dstInferLoc.get(idx).getLocIdentifier();
+
+ if (srcLocSymbol.equals(dstLocSymbol)) {
+ recursiveAddRelationToLattice(idx + 1, md, srcInferLoc, dstInferLoc);
+ } else {
+
+ Descriptor parentDesc = srcInferLoc.get(idx).getDescriptor();
+ LocationInfo locInfo = getLocationInfo(parentDesc);
+
+ addRelationHigherToLower(getLattice(parentDesc), getLocationInfo(parentDesc), srcLocSymbol,
+ dstLocSymbol);
+ }
+
+ }
+
private void analyzeLatticeMethodInvocationNode(MethodDescriptor mdCaller) {
// the transformation for a call site propagates all relations between
}
private void addRelationToLattice(MethodDescriptor md, SSJavaLattice<String> methodLattice,
- FlowNode srcNode, FlowNode dstNode) {
+ MethodLocationInfo methodInfo, FlowNode srcNode, FlowNode dstNode) {
+ System.out.println();
System.out.println("### addRelationToLattice src=" + srcNode + " dst=" + dstNode);
// add a new binary relation of dstNode < srcNode
FlowGraph flowGraph = getFlowGraph(md);
- MethodLocationInfo methodInfo = getMethodLocationInfo(md);
+ // MethodLocationInfo methodInfo = getMethodLocationInfo(md);
- String srcOriginSymbol = getSymbol(0, srcNode);
- String dstOriginSymbol = getSymbol(0, dstNode);
+ // String srcOriginSymbol = getSymbol(0, srcNode);
+ // String dstOriginSymbol = getSymbol(0, dstNode);
Descriptor srcDesc = getDescriptor(0, srcNode);
Descriptor dstDesc = getDescriptor(0, dstNode);
- String srcSymbol = methodInfo.getLocName(srcOriginSymbol);
- String dstSymbol = methodInfo.getLocName(dstOriginSymbol);
+ // consider a composite location case
+ boolean isSrcLocalVar = false;
+ boolean isDstLocalVar = false;
+ if (srcNode.getDescTuple().size() == 1) {
+ isSrcLocalVar = true;
+ }
+
+ if (dstNode.getDescTuple().size() == 1) {
+ isDstLocalVar = true;
+ }
+
+ boolean isAssignedCompositeLocation = false;
+ if (!methodInfo.getInferLocation(srcDesc).get(0).getLocIdentifier()
+ .equals(methodInfo.getThisLocName())) {
+ isAssignedCompositeLocation =
+ calculateCompositeLocation(flowGraph, methodLattice, methodInfo, srcNode);
+ }
+
+ String srcSymbol = methodInfo.getInferLocation(srcDesc).get(0).getLocIdentifier();
+ String dstSymbol = methodInfo.getInferLocation(dstDesc).get(0).getLocIdentifier();
+
if (srcNode.isParameter()) {
int paramIdx = flowGraph.getParamIdx(srcNode.getDescTuple());
methodInfo.addParameter(srcSymbol, srcDesc, paramIdx);
} else {
- methodInfo.addMappingOfLocNameToDescriptor(srcSymbol, srcDesc);
+ // methodInfo.addMappingOfLocNameToDescriptor(srcSymbol, srcDesc);
}
if (dstNode.isParameter()) {
int paramIdx = flowGraph.getParamIdx(dstNode.getDescTuple());
methodInfo.addParameter(dstSymbol, dstDesc, paramIdx);
} else {
- methodInfo.addMappingOfLocNameToDescriptor(dstSymbol, dstDesc);
+ // methodInfo.addMappingOfLocNameToDescriptor(dstSymbol, dstDesc);
}
- // consider a composite location case
+ if (!isAssignedCompositeLocation) {
+ // source does not have a composite location
+ if (!srcSymbol.equals(dstSymbol)) {
+ // add a local relation
+ if (!methodLattice.isGreaterThan(srcSymbol, dstSymbol)) {
+ // if the lattice does not have this relation, add it
+ addRelationHigherToLower(methodLattice, methodInfo, srcSymbol, dstSymbol);
+ // methodLattice.addRelationHigherToLower(srcSymbol, dstSymbol);
+ }
+ } else {
+ // if src and dst have the same local location...
- boolean isSrcLocalVar = false;
- boolean isDstLocalVar = false;
- if (srcNode.getDescTuple().size() == 1) {
- isSrcLocalVar = true;
- }
+ recursivelyAddCompositeRelation(md, flowGraph, methodInfo, srcNode, dstNode, srcDesc,
+ dstDesc);
+
+ }
+
+ } else {
+ // source variable has a composite location
+ if (methodInfo.getInferLocation(dstDesc).getSize() == 1) {
+ if (!srcSymbol.equals(dstSymbol)) {
+ addRelationHigherToLower(methodLattice, methodInfo, srcSymbol, dstSymbol);
+ }
+ }
- if (dstNode.getDescTuple().size() == 1) {
- isDstLocalVar = true;
}
- boolean isAssignedCompositeLocation = false;
- if (isSrcLocalVar && isDstLocalVar) {
- // both src and dst are local var
-
- // CompositeLocation inferSrc=methodInfo.getInferLocation(srcNode);
- // CompositeLocation inferDst=methodInfo.getInferLocation(dstNode);
- // if( (inferSrc!=null && inferSrc.getSize()>1) || (inferDst!=null &&
- // inferDst.getSize()>1)){
- // isAssignedCompositeLocation = true;
- // }
- // TODO: need to fix
- isAssignedCompositeLocation =
- calculateCompositeLocationForLocalVar(flowGraph, methodLattice, methodInfo, srcNode);
- calculateCompositeLocationForLocalVar(flowGraph, methodLattice, methodInfo, dstNode);
+ }
- } else if (isSrcLocalVar) {
- // src is local var
- isAssignedCompositeLocation =
- calculateCompositeLocationForLocalVar(flowGraph, methodLattice, methodInfo, srcNode);
- } else if (isDstLocalVar) {
- // dst is local var
- isAssignedCompositeLocation =
- calculateCompositeLocationForLocalVar(flowGraph, methodLattice, methodInfo, dstNode);
- }
+ private void recursivelyAddCompositeRelation(MethodDescriptor md, FlowGraph flowGraph,
+ MethodLocationInfo methodInfo, FlowNode srcNode, FlowNode dstNode, Descriptor srcDesc,
+ Descriptor dstDesc) {
- if (!isAssignedCompositeLocation) {
- if (!methodLattice.isGreaterThan(srcSymbol, dstSymbol)) {
- // if the lattice does not have this relation, add it
- methodLattice.addRelationHigherToLower(srcSymbol, dstSymbol);
+ CompositeLocation inferSrcLoc;
+ CompositeLocation inferDstLoc = methodInfo.getInferLocation(dstDesc);
+
+ if (srcNode.getDescTuple().size() > 1) {
+ // field access
+ inferSrcLoc = new CompositeLocation();
+
+ NTuple<Location> locTuple = flowGraph.getLocationTuple(srcNode);
+ for (int i = 0; i < locTuple.size(); i++) {
+ inferSrcLoc.addLocation(locTuple.get(i));
}
+
+ } else {
+ inferSrcLoc = methodInfo.getInferLocation(srcDesc);
}
- // Set<String> cycleElementSet =
- // methodLattice.getPossibleCycleElements(srcSymbol, dstSymbol);
- //
- // System.out.println("### POSSIBLE CYCLE ELEMENT SET=" + cycleElementSet);
- // boolean hasNonPrimitiveElement = false;
- // for (Iterator iterator = cycleElementSet.iterator(); iterator.hasNext();)
- // {
- // String cycleElementSymbol = (String) iterator.next();
- // Set<Descriptor> flowNodeSet =
- // methodInfo.getFlowNodeSet(cycleElementSymbol);
- // for (Iterator iterator2 = flowNodeSet.iterator(); iterator2.hasNext();) {
- // Descriptor desc = (Descriptor) iterator2.next();
- // if (!isPrimitiveTypeDescriptor(desc)) {
- // hasNonPrimitiveElement = true;
- // }
- // System.out
- // .println("flowNode=" + desc + " is primitive?=" +
- // isPrimitiveTypeDescriptor(desc));
- // }
- // }
- //
- // if (hasNonPrimitiveElement) {
- // // if there is non-primitive element in the cycle, no way to merge cyclic
- // // elements into the shared location
- // System.out.println("Failed to merge cyclic value flows into a shared location.");
- //
- // // try to assign more fine-grind composite location to the source or the
- // // destination
- // System.out.println("SRC=" + srcSymbol + " DST=" + dstSymbol);
- // System.out.println("### SRCNODE=" + srcNode + " DSTNODE=" + dstNode);
- //
- // FlowNode targetNode;
- // if (isPrimitiveLocalVariable(srcNode)) {
- // targetNode = srcNode;
- // } else {
- // targetNode = dstNode;
- // }
- //
- // calculateMoreFineGrainedLocation(md, methodLattice, targetNode);
- //
- // return;
- // }
- //
- // if (cycleElementSet.size() > 0) {
- // String newSharedLoc = "SharedLoc" + (SSJavaLattice.seed++);
- // methodLattice.mergeIntoSharedLocation(cycleElementSet, newSharedLoc);
- //
- // for (Iterator iterator = cycleElementSet.iterator(); iterator.hasNext();)
- // {
- // String locName = (String) iterator.next();
- // methodInfo.mapDescSymbolToLocName(locName, newSharedLoc);
- // }
- //
- // } else if (!methodLattice.isGreaterThan(srcSymbol, dstSymbol)) {
- // // if the lattice does not have this relation, add it
- // methodLattice.addRelationHigherToLower(srcSymbol, dstSymbol);
- // }
- //
- // System.out.println("methodLattice=" + methodLattice.getKeySet());
+ if (dstNode.getDescTuple().size() > 1) {
+ // field access
+ inferDstLoc = new CompositeLocation();
+
+ NTuple<Location> locTuple = flowGraph.getLocationTuple(dstNode);
+ for (int i = 0; i < locTuple.size(); i++) {
+ inferDstLoc.addLocation(locTuple.get(i));
+ }
+ } else {
+ inferDstLoc = methodInfo.getInferLocation(dstDesc);
+ }
+
+ recursiveAddRelationToLattice(1, md, inferSrcLoc, inferDstLoc);
}
private void addPrefixMapping(Map<NTuple<Location>, Set<NTuple<Location>>> map,
map.put(prefix, new HashSet<NTuple<Location>>());
}
map.get(prefix).add(element);
-
- }
-
- private NTuple<Location> getLocationTuple(MethodLocationInfo methodInfo, FlowGraph flowGraph,
- FlowNode flowNode) {
-
- NTuple<Location> locTuple;
- CompositeLocation inferLoc = methodInfo.getInferLocation(flowNode);
- if (inferLoc != null) {
- // the flow node has already been assigned to the location
- locTuple = new NTuple<Location>();
- NTuple<Location> inferLocTuple = inferLoc.getTuple();
- for (int i = 0; i < inferLocTuple.size(); i++) {
- locTuple.add(inferLocTuple.get(i));
- }
- } else {
- locTuple = flowGraph.getLocationTuple(flowNode);
- }
-
- return locTuple;
}
- private boolean calculateCompositeLocationForLocalVar(FlowGraph flowGraph,
+ private boolean calculateCompositeLocation(FlowGraph flowGraph,
SSJavaLattice<String> methodLattice, MethodLocationInfo methodInfo, FlowNode flowNode) {
+ Descriptor localVarDesc = flowNode.getDescTuple().get(0);
+
Set<FlowNode> inNodeSet = flowGraph.getIncomingFlowNodeSet(flowNode);
Set<FlowNode> reachableNodeSet = flowGraph.getReachableFlowNodeSet(flowNode);
Map<NTuple<Location>, Set<NTuple<Location>>> mapPrefixToIncomingLocTupleSet =
new HashMap<NTuple<Location>, Set<NTuple<Location>>>();
+ Set<FlowNode> localInNodeSet = new HashSet<FlowNode>();
+ Set<FlowNode> localOutNodeSet = new HashSet<FlowNode>();
+
List<NTuple<Location>> prefixList = new ArrayList<NTuple<Location>>();
for (Iterator iterator = inNodeSet.iterator(); iterator.hasNext();) {
FlowNode inNode = (FlowNode) iterator.next();
- NTuple<Location> inTuple = getLocationTuple(methodInfo, flowGraph, inNode);
+ NTuple<Location> inTuple = flowGraph.getLocationTuple(inNode);
if (inTuple.size() > 1) {
for (int i = 1; i < inTuple.size(); i++) {
}
addPrefixMapping(mapPrefixToIncomingLocTupleSet, prefix, inTuple);
}
+ } else {
+ localInNodeSet.add(inNode);
}
}
}
});
+
+ for (Iterator iterator2 = reachableNodeSet.iterator(); iterator2.hasNext();) {
+ FlowNode reachableNode = (FlowNode) iterator2.next();
+ if (reachableNode.getDescTuple().size() == 1) {
+ localOutNodeSet.add(reachableNode);
+ }
+ }
+
// find out reachable nodes that have the longest common prefix
for (int i = 0; i < prefixList.size(); i++) {
NTuple<Location> curPrefix = prefixList.get(i);
if (reachLocTuple.startsWith(curPrefix)) {
reachableCommonPrefixSet.add(reachLocTuple);
}
+
}
+
if (!reachableCommonPrefixSet.isEmpty()) {
+ // found reachable nodes that start with the prefix curPrefix
+ // need to assign a composite location
+
+ // first, check if there are more than one the set of locations that has
+ // the same length of the longest reachable prefix, no way to assign
+ // a composite location to the input local var
+ prefixSanityCheck(prefixList, i, flowGraph, reachableNodeSet);
+
Set<NTuple<Location>> incomingCommonPrefixSet =
mapPrefixToIncomingLocTupleSet.get(curPrefix);
SSJavaLattice<String> lattice = getLattice(desc);
LocationInfo locInfo = getLocationInfo(desc);
- CompositeLocation inferNode = methodInfo.getInferLocation(flowNode);
- String nodeSymbol;
- if (inferNode != null) {
+ // CompositeLocation inferLocation =
+ // methodInfo.getInferLocation(flowNode);
+ CompositeLocation inferLocation = methodInfo.getInferLocation(localVarDesc);
+
+ String newlyInsertedLocName;
+ if (inferLocation.getSize() == 1) {
+ // need to replace the old local location with a new composite
+ // location
+
+ String oldMethodLocationSymbol = inferLocation.get(0).getLocIdentifier();
- } else {
String newLocSymbol = "Loc" + (SSJavaLattice.seed++);
- inferNode = new CompositeLocation();
+ inferLocation = new CompositeLocation();
for (int locIdx = 0; locIdx < curPrefix.size(); locIdx++) {
- inferNode.addLocation(curPrefix.get(locIdx));
- }
- inferNode.addLocation(new Location(desc, newLocSymbol));
- methodInfo.mapFlowNodeToInferLocation(flowNode, inferNode);
- if (flowNode.getDescTuple().size() == 1) {
- // local variable case
- modifyLocalLatticeAccrodingToNewlyAddedCompositeLocation(methodLattice, methodInfo,
- inferNode, flowNode);
+ inferLocation.addLocation(curPrefix.get(locIdx));
}
+ Location fieldLoc = new Location(desc, newLocSymbol);
+ inferLocation.addLocation(fieldLoc);
+
+
+ methodInfo.mapDescriptorToLocation(localVarDesc, inferLocation);
+ methodInfo.removeMaplocalVarToLocSet(localVarDesc);
+
+ String newMethodLocationSymbol = curPrefix.get(0).getLocIdentifier();
+
+ replaceOldLocWithNewLoc(methodLattice, oldMethodLocationSymbol, newMethodLocationSymbol);
+
+ } else {
+
+ String localLocName = methodInfo.getInferLocation(localVarDesc).get(0).getLocIdentifier();
+ return true;
+
+
}
- nodeSymbol = inferNode.get(inferNode.getSize() - 1).getLocIdentifier();
+ newlyInsertedLocName = inferLocation.get(inferLocation.getSize() - 1).getLocIdentifier();
for (Iterator iterator = incomingCommonPrefixSet.iterator(); iterator.hasNext();) {
NTuple<Location> tuple = (NTuple<Location>) iterator.next();
+
Location loc = tuple.get(idx);
- String higher = locInfo.getLocName(loc.getLocIdentifier());
- lattice.addRelationHigherToLower(higher, nodeSymbol);
+ String higher = locInfo.getFieldInferLocation(loc.getLocDescriptor()).getLocIdentifier();
+ System.out.println("here3");
+
+ addRelationHigherToLower(lattice, locInfo, higher, newlyInsertedLocName);
+ }
+
+
+ for (Iterator iterator = localInNodeSet.iterator(); iterator.hasNext();) {
+ FlowNode localNode = (FlowNode) iterator.next();
+ Descriptor localInVarDesc = localNode.getDescTuple().get(0);
+ CompositeLocation inNodeInferLoc = methodInfo.getInferLocation(localInVarDesc);
+
+ if (isCompositeLocation(inNodeInferLoc)) {
+ // need to make sure that newLocSymbol is lower than the infernode
+ // location in the field lattice
+
+ if (inNodeInferLoc.getTuple().startsWith(curPrefix)
+ && inNodeInferLoc.getSize() == (curPrefix.size() + 1)) {
+ String higher = inNodeInferLoc.get(inNodeInferLoc.getSize() - 1).getLocIdentifier();
+ if (!higher.equals(newlyInsertedLocName)) {
+
+ addRelationHigherToLower(lattice, locInfo, higher, newlyInsertedLocName);
+ }
+ } else {
+ throw new Error("Failed to generate a composite location.");
+ }
+
+ }
}
for (Iterator iterator = reachableCommonPrefixSet.iterator(); iterator.hasNext();) {
NTuple<Location> tuple = (NTuple<Location>) iterator.next();
Location loc = tuple.get(idx);
- String lower = locInfo.getLocName(loc.getLocIdentifier());
- lattice.addRelationHigherToLower(nodeSymbol, lower);
+ String lower = locInfo.getFieldInferLocation(loc.getLocDescriptor()).getLocIdentifier();
+ // lattice.addRelationHigherToLower(newlyInsertedLocName, lower);
+
+ addRelationHigherToLower(lattice, locInfo, newlyInsertedLocName, lower);
+ }
+
+ for (Iterator iterator = localOutNodeSet.iterator(); iterator.hasNext();) {
+ FlowNode localOutNode = (FlowNode) iterator.next();
+
+ Descriptor localOutDesc = localOutNode.getDescTuple().get(0);
+ // String localOutNodeSymbol =
+ // localOutNode.getDescTuple().get(0).getSymbol();
+ CompositeLocation outNodeInferLoc = methodInfo.getInferLocation(localOutDesc);
+
+ // System.out
+ // .println("localOutNode=" + localOutNode + " outNodeInferLoc=" +
+ // outNodeInferLoc);
+ if (isCompositeLocation(outNodeInferLoc)) {
+ // need to make sure that newLocSymbol is higher than the infernode
+ // location
+
+ if (outNodeInferLoc.getTuple().startsWith(curPrefix)
+ && outNodeInferLoc.getSize() == (curPrefix.size() + 1)) {
+
+ String lower = outNodeInferLoc.get(outNodeInferLoc.getSize() - 1).getLocIdentifier();
+
+ addRelationHigherToLower(lattice, locInfo, newlyInsertedLocName, lower);
+
+ } else {
+ throw new Error("Failed to generate a composite location.");
+ }
+ }
}
return true;
}
- private void modifyLocalLatticeAccrodingToNewlyAddedCompositeLocation(
- SSJavaLattice<String> methodLattice, MethodLocationInfo methodInfo,
- CompositeLocation inferNode, FlowNode flowNode) {
+ private boolean isCompositeLocation(CompositeLocation cl) {
+ return cl.getSize() > 1;
+ }
+
+ private boolean containsNonPrimitiveElement(Set<Descriptor> descSet) {
+ for (Iterator iterator = descSet.iterator(); iterator.hasNext();) {
+ Descriptor desc = (Descriptor) iterator.next();
+
+ if (desc instanceof VarDescriptor) {
+ if (!((VarDescriptor) desc).getType().isPrimitive()) {
+ return true;
+ }
+ } else if (desc instanceof FieldDescriptor) {
+ if (!((FieldDescriptor) desc).getType().isPrimitive()) {
+ return true;
+ }
+ }
+
+ }
+ return false;
+ }
+
+ private void addRelationHigherToLower(SSJavaLattice<String> lattice, LocationInfo locInfo,
+ String higher, String lower) {
+
+ Set<String> cycleElementSet = lattice.getPossibleCycleElements(higher, lower);
+
+ boolean hasNonPrimitiveElement = false;
+ for (Iterator iterator = cycleElementSet.iterator(); iterator.hasNext();) {
+ String cycleElementLocSymbol = (String) iterator.next();
+
+ Set<Descriptor> descSet = locInfo.getDescSet(cycleElementLocSymbol);
+ if (containsNonPrimitiveElement(descSet)) {
+ hasNonPrimitiveElement = true;
+ break;
+ }
+ }
+
+ if (hasNonPrimitiveElement) {
+ // if there is non-primitive element in the cycle, no way to merge cyclic
+ // elements into the shared location
+ throw new Error("Failed to merge cyclic value flows into a shared location.");
+ }
+
+ if (cycleElementSet.size() > 0) {
+ String newSharedLoc = "SharedLoc" + (SSJavaLattice.seed++);
+
+ lattice.mergeIntoSharedLocation(cycleElementSet, newSharedLoc);
+
+ for (Iterator iterator = cycleElementSet.iterator(); iterator.hasNext();) {
+ String oldLocSymbol = (String) iterator.next();
+ locInfo.mergeMapping(oldLocSymbol, newSharedLoc);
+ }
+
+
+ } else if (!lattice.isGreaterThan(higher, lower)) {
+ lattice.addRelationHigherToLower(higher, lower);
+ }
+ }
+
+ private void replaceOldLocWithNewLoc(SSJavaLattice<String> methodLattice, String oldLocSymbol,
+ String newLocSymbol) {
+
+ if (methodLattice.containsKey(oldLocSymbol)) {
+ methodLattice.substituteLocation(oldLocSymbol, newLocSymbol);
+ }
+
+ }
+
+ private void prefixSanityCheck(List<NTuple<Location>> prefixList, int curIdx,
+ FlowGraph flowGraph, Set<FlowNode> reachableNodeSet) {
- Location localLocation = inferNode.get(0);
- String newLocName = methodInfo.getLocName(localLocation.getLocIdentifier());
- String oldLocName = methodInfo.getLocName(flowNode.getDescTuple().get(0).getSymbol());
- methodInfo.mapDescSymbolToLocName(oldLocName, newLocName);
- methodLattice.substituteLocation(oldLocName, newLocName);
+ NTuple<Location> curPrefix = prefixList.get(curIdx);
+ for (int i = curIdx + 1; i < prefixList.size(); i++) {
+ NTuple<Location> prefixTuple = prefixList.get(i);
+
+ if (curPrefix.startsWith(prefixTuple)) {
+ continue;
+ }
+
+ for (Iterator iterator2 = reachableNodeSet.iterator(); iterator2.hasNext();) {
+ FlowNode reachableNode = (FlowNode) iterator2.next();
+ NTuple<Location> reachLocTuple = flowGraph.getLocationTuple(reachableNode);
+ if (reachLocTuple.startsWith(prefixTuple)) {
+ // TODO
+ throw new Error("Failed to generate a composite location");
+ }
+ }
+ }
}
public boolean isPrimitiveLocalVariable(FlowNode node) {
private void extractRelationFromFieldFlows(ClassDescriptor cd, FlowNode srcNode,
FlowNode dstNode, int idx) {
+
if (srcNode.getDescTuple().get(idx).equals(dstNode.getDescTuple().get(idx))
&& srcNode.getDescTuple().size() > (idx + 1) && dstNode.getDescTuple().size() > (idx + 1)) {
// value flow between fields: we don't need to add a binary relation
// add a new binary relation of dstNode < srcNode
SSJavaLattice<String> fieldLattice = getFieldLattice(cd);
-
- String srcOriginalSymbol = srcFieldDesc.getSymbol();
- String dstOriginalSymbol = dstFieldDesc.getSymbol();
-
LocationInfo fieldInfo = getFieldLocationInfo(cd);
- String srcSymbol = fieldInfo.getLocName(srcOriginalSymbol);
- String dstSymbol = fieldInfo.getLocName(dstOriginalSymbol);
- Set<String> cycleElementSet = fieldLattice.getPossibleCycleElements(srcSymbol, dstSymbol);
+ String srcSymbol = fieldInfo.getFieldInferLocation(srcFieldDesc).getLocIdentifier();
+ String dstSymbol = fieldInfo.getFieldInferLocation(dstFieldDesc).getLocIdentifier();
- if (cycleElementSet.size() > 0) {
- String newSharedLoc = "SharedLoc" + (SSJavaLattice.seed++);
- fieldLattice.mergeIntoSharedLocation(cycleElementSet, newSharedLoc);
-
- for (Iterator iterator = cycleElementSet.iterator(); iterator.hasNext();) {
- String locName = (String) iterator.next();
- fieldInfo.mapDescSymbolToLocName(locName, newSharedLoc);
- }
-
- } else if (!fieldLattice.isGreaterThan(srcSymbol, dstSymbol)) {
- // if the lattice does not have this relation, add it
- fieldLattice.addRelationHigherToLower(srcSymbol, dstSymbol);
- }
+ addRelationHigherToLower(fieldLattice, fieldInfo, srcSymbol, dstSymbol);
}
} else {
// check 'for loop' case
BlockNode bn = ln.getInitializer();
- analyzeFlowBlockNode(md, bn.getVarTable(), bn, implicitFlowTupleSet);
bn.getVarTable().setParent(nametable);
+ for (int i = 0; i < bn.size(); i++) {
+ BlockStatementNode bsn = bn.get(i);
+ analyzeBlockStatementNode(md, bn.getVarTable(), bsn, implicitFlowTupleSet);
+ }
NodeTupleSet condTupleNode = new NodeTupleSet();
analyzeFlowExpressionNode(md, bn.getVarTable(), ln.getCondition(), condTupleNode, null,
private void analyzeFlowAssignmentNode(MethodDescriptor md, SymbolTable nametable,
AssignmentNode an, NTuple<Descriptor> base, NodeTupleSet implicitFlowTupleSet) {
+ // System.out.println("#an=" + an.printNode(0) + " an src=" +
+ // an.getSrc().printNode(0) + " dst="
+ // + an.getDest().printNode(0));
NodeTupleSet nodeSetRHS = new NodeTupleSet();
NodeTupleSet nodeSetLHS = new NodeTupleSet();
.getBaseOp().getOp() != Operation.POSTDEC)) {
postinc = false;
}
-
// if LHS is array access node, need to capture value flows between an array
// and its index value
analyzeFlowExpressionNode(md, nametable, an.getDest(), nodeSetLHS, null, implicitFlowTupleSet,
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