package Analysis.SSJava;
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.FileReader;
+import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
+import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
+import java.util.Stack;
+import java.util.Vector;
import IR.ClassDescriptor;
import IR.Descriptor;
import IR.Tree.SubBlockNode;
import IR.Tree.SwitchStatementNode;
import IR.Tree.TertiaryNode;
+import IR.Tree.TreeNode;
+import Util.Pair;
public class LocationInference {
List<MethodDescriptor> toanalyzeMethodList;
Map<MethodDescriptor, FlowGraph> mapMethodDescriptorToFlowGraph;
+ // map a method descriptor to its set of parameter descriptors
+ Map<MethodDescriptor, Set<Descriptor>> mapMethodDescriptorToParamDescSet;
+
+ // keep current descriptors to visit in fixed-point interprocedural analysis,
+ private Stack<MethodDescriptor> methodDescriptorsToVisitStack;
+
+ // map a class descriptor to a field lattice
+ private Map<ClassDescriptor, SSJavaLattice<String>> cd2lattice;
+
+ // map a method descriptor to a method lattice
+ private Map<MethodDescriptor, SSJavaLattice<String>> md2lattice;
+
+ // map a method descriptor to the set of method invocation nodes which are
+ // invoked by the method descriptor
+ private Map<MethodDescriptor, Set<MethodInvokeNode>> mapMethodDescriptorToMethodInvokeNodeSet;
+
+ private Map<MethodInvokeNode, Map<Integer, NodeTupleSet>> mapMethodInvokeNodeToArgIdxMap;
+
+ private Map<MethodDescriptor, MethodLocationInfo> mapMethodDescToMethodLocationInfo;
+
+ private Map<ClassDescriptor, LocationInfo> mapClassToLocationInfo;
+
+ private Map<MethodDescriptor, Set<MethodDescriptor>> mapMethodToCalleeSet;
+
+ private Map<String, Vector<String>> mapFileNameToLineVector;
+
+ private Map<Descriptor, Integer> mapDescToDefinitionLine;
+
+ public static final String GLOBALLOC = "GLOBALLOC";
+
+ public static final String TOPLOC = "TOPLOC";
+
+ public static final Descriptor GLOBALDESC = new NameDescriptor(GLOBALLOC);
+
+ public static final Descriptor TOPDESC = new NameDescriptor(TOPLOC);
+
+ public static String newline = System.getProperty("line.separator");
+
+ LocationInfo curMethodInfo;
+
boolean debug = true;
- public LocationInference(SSJavaAnalysis ssjava, State state) {
- this.ssjava = ssjava;
- this.state = state;
- this.toanalyzeList = new ArrayList<ClassDescriptor>();
- this.toanalyzeMethodList = new ArrayList<MethodDescriptor>();
- this.mapMethodDescriptorToFlowGraph = new HashMap<MethodDescriptor, FlowGraph>();
+ public LocationInference(SSJavaAnalysis ssjava, State state) {
+ this.ssjava = ssjava;
+ this.state = state;
+ this.toanalyzeList = new ArrayList<ClassDescriptor>();
+ this.toanalyzeMethodList = new ArrayList<MethodDescriptor>();
+ this.mapMethodDescriptorToFlowGraph = new HashMap<MethodDescriptor, FlowGraph>();
+ this.cd2lattice = new HashMap<ClassDescriptor, SSJavaLattice<String>>();
+ this.md2lattice = new HashMap<MethodDescriptor, SSJavaLattice<String>>();
+ this.methodDescriptorsToVisitStack = new Stack<MethodDescriptor>();
+ this.mapMethodDescriptorToMethodInvokeNodeSet =
+ new HashMap<MethodDescriptor, Set<MethodInvokeNode>>();
+ this.mapMethodInvokeNodeToArgIdxMap =
+ new HashMap<MethodInvokeNode, Map<Integer, NodeTupleSet>>();
+ this.mapMethodDescToMethodLocationInfo = new HashMap<MethodDescriptor, MethodLocationInfo>();
+ this.mapMethodToCalleeSet = new HashMap<MethodDescriptor, Set<MethodDescriptor>>();
+ this.mapClassToLocationInfo = new HashMap<ClassDescriptor, LocationInfo>();
+
+ this.mapFileNameToLineVector = new HashMap<String, Vector<String>>();
+ this.mapDescToDefinitionLine = new HashMap<Descriptor, Integer>();
+ }
+
+ public void setupToAnalyze() {
+ SymbolTable classtable = state.getClassSymbolTable();
+ toanalyzeList.clear();
+ toanalyzeList.addAll(classtable.getValueSet());
+ Collections.sort(toanalyzeList, new Comparator<ClassDescriptor>() {
+ public int compare(ClassDescriptor o1, ClassDescriptor o2) {
+ return o1.getClassName().compareToIgnoreCase(o2.getClassName());
+ }
+ });
+ }
+
+ public void setupToAnalazeMethod(ClassDescriptor cd) {
+
+ SymbolTable methodtable = cd.getMethodTable();
+ toanalyzeMethodList.clear();
+ toanalyzeMethodList.addAll(methodtable.getValueSet());
+ Collections.sort(toanalyzeMethodList, new Comparator<MethodDescriptor>() {
+ public int compare(MethodDescriptor o1, MethodDescriptor o2) {
+ return o1.getSymbol().compareToIgnoreCase(o2.getSymbol());
+ }
+ });
+ }
+
+ public boolean toAnalyzeMethodIsEmpty() {
+ return toanalyzeMethodList.isEmpty();
+ }
+
+ public boolean toAnalyzeIsEmpty() {
+ return toanalyzeList.isEmpty();
+ }
+
+ public ClassDescriptor toAnalyzeNext() {
+ return toanalyzeList.remove(0);
+ }
+
+ public MethodDescriptor toAnalyzeMethodNext() {
+ return toanalyzeMethodList.remove(0);
+ }
+
+ public void inference() {
+
+ // 1) construct value flow graph
+ constructFlowGraph();
+
+ // 2) construct lattices
+ inferLattices();
+
+ simplifyLattices();
+
+ debug_writeLatticeDotFile();
+
+ // 3) check properties
+ checkLattices();
+
+ // 4) generate annotated source codes
+ generateAnnoatedCode();
+
+ }
+
+ private void addMapClassDefinitionToLineNum(ClassDescriptor cd, String strLine, int lineNum) {
+
+ String classSymbol = cd.getSymbol();
+ int idx = classSymbol.lastIndexOf("$");
+ if (idx != -1) {
+ classSymbol = classSymbol.substring(idx + 1);
+ }
+
+ String pattern = "class " + classSymbol + " ";
+ if (strLine.indexOf(pattern) != -1) {
+ mapDescToDefinitionLine.put(cd, lineNum);
+ }
+ }
+
+ private void addMapMethodDefinitionToLineNum(Set<MethodDescriptor> methodSet, String strLine,
+ int lineNum) {
+ for (Iterator iterator = methodSet.iterator(); iterator.hasNext();) {
+ MethodDescriptor md = (MethodDescriptor) iterator.next();
+ String pattern = md.getMethodDeclaration();
+ if (strLine.indexOf(pattern) != -1) {
+ mapDescToDefinitionLine.put(md, lineNum);
+ methodSet.remove(md);
+ return;
+ }
+ }
+
+ }
+
+ private void readOriginalSourceFiles() {
+
+ SymbolTable classtable = state.getClassSymbolTable();
+
+ Set<ClassDescriptor> classDescSet = new HashSet<ClassDescriptor>();
+ classDescSet.addAll(classtable.getValueSet());
+
+ try {
+ // inefficient implement. it may re-visit the same file if the file
+ // contains more than one class definitions.
+ for (Iterator iterator = classDescSet.iterator(); iterator.hasNext();) {
+ ClassDescriptor cd = (ClassDescriptor) iterator.next();
+
+ Set<MethodDescriptor> methodSet = new HashSet<MethodDescriptor>();
+ methodSet.addAll(cd.getMethodTable().getValueSet());
+
+ String sourceFileName = cd.getSourceFileName();
+ Vector<String> lineVec = new Vector<String>();
+
+ mapFileNameToLineVector.put(sourceFileName, lineVec);
+
+ BufferedReader in = new BufferedReader(new FileReader(sourceFileName));
+ String strLine;
+ int lineNum = 1;
+ lineVec.add(""); // the index is started from 1.
+ while ((strLine = in.readLine()) != null) {
+ lineVec.add(lineNum, strLine);
+ addMapClassDefinitionToLineNum(cd, strLine, lineNum);
+ addMapMethodDefinitionToLineNum(methodSet, strLine, lineNum);
+ lineNum++;
+ }
+
+ }
+
+ } catch (IOException e) {
+ e.printStackTrace();
+ }
+
+ }
+
+ private String generateLatticeDefinition(Descriptor desc) {
+
+ Set<String> sharedLocSet = new HashSet<String>();
+
+ SSJavaLattice<String> lattice = getLattice(desc);
+ String rtr = "@LATTICE(\"";
+
+ Map<String, Set<String>> map = lattice.getTable();
+ Set<String> keySet = map.keySet();
+ boolean first = true;
+ for (Iterator iterator = keySet.iterator(); iterator.hasNext();) {
+ String key = (String) iterator.next();
+ if (!key.equals(lattice.getTopItem())) {
+ Set<String> connectedSet = map.get(key);
+
+ if (connectedSet.size() == 1) {
+ if (connectedSet.iterator().next().equals(lattice.getBottomItem())) {
+ if (!first) {
+ rtr += ",";
+ } else {
+ rtr += "LOC,";
+ first = false;
+ }
+ rtr += key;
+ if (lattice.isSharedLoc(key)) {
+ rtr += "," + key + "*";
+ }
+ }
+ }
+
+ for (Iterator iterator2 = connectedSet.iterator(); iterator2.hasNext();) {
+ String loc = (String) iterator2.next();
+ if (!loc.equals(lattice.getBottomItem())) {
+ if (!first) {
+ rtr += ",";
+ } else {
+ rtr += "LOC,";
+ first = false;
+ }
+ rtr += loc + "<" + key;
+ if (lattice.isSharedLoc(key) && (!sharedLocSet.contains(key))) {
+ rtr += "," + key + "*";
+ sharedLocSet.add(key);
+ }
+ if (lattice.isSharedLoc(loc) && (!sharedLocSet.contains(loc))) {
+ rtr += "," + loc + "*";
+ sharedLocSet.add(loc);
+ }
+
+ }
+ }
+ }
+ }
+
+ rtr += "\")";
+
+ if (desc instanceof MethodDescriptor) {
+ TypeDescriptor returnType = ((MethodDescriptor) desc).getReturnType();
+ if (returnType != null && (!returnType.isVoid())) {
+ rtr += "\n@RETURNLOC(\"RETURNLOC\")";
+ }
+ rtr += "\n@THISLOC(\"this\")\n@PCLOC(\"PCLOC\")\n@GLOBALLOC(\"GLOBALLOC\")";
+
+ }
+
+ return rtr;
+ }
+
+ private void generateAnnoatedCode() {
+
+ readOriginalSourceFiles();
+
+ setupToAnalyze();
+ while (!toAnalyzeIsEmpty()) {
+ ClassDescriptor cd = toAnalyzeNext();
+
+ setupToAnalazeMethod(cd);
+
+ LocationInfo locInfo = mapClassToLocationInfo.get(cd);
+ String sourceFileName = cd.getSourceFileName();
+
+ if (cd.isInterface()) {
+ continue;
+ }
+
+ int classDefLine = mapDescToDefinitionLine.get(cd);
+ Vector<String> sourceVec = mapFileNameToLineVector.get(sourceFileName);
+
+ if (locInfo == null) {
+ locInfo = getLocationInfo(cd);
+ }
+
+ for (Iterator iter = cd.getFields(); iter.hasNext();) {
+ Descriptor fieldDesc = (Descriptor) iter.next();
+ String locIdentifier = locInfo.getFieldInferLocation(fieldDesc).getLocIdentifier();
+ if (!getLattice(cd).containsKey(locIdentifier)) {
+ getLattice(cd).put(locIdentifier);
+ }
+ }
+
+ String fieldLatticeDefStr = generateLatticeDefinition(cd);
+ String annoatedSrc = fieldLatticeDefStr + newline + sourceVec.get(classDefLine);
+ sourceVec.set(classDefLine, annoatedSrc);
+
+ // generate annotations for field declarations
+ LocationInfo fieldLocInfo = getLocationInfo(cd);
+ Map<Descriptor, CompositeLocation> inferLocMap = fieldLocInfo.getMapDescToInferLocation();
+
+ for (Iterator iter = cd.getFields(); iter.hasNext();) {
+ FieldDescriptor fd = (FieldDescriptor) iter.next();
+
+ String locAnnotationStr;
+ if (inferLocMap.containsKey(fd)) {
+ CompositeLocation inferLoc = inferLocMap.get(fd);
+ locAnnotationStr = generateLocationAnnoatation(inferLoc);
+ } else {
+ // if the field is not accssed by SS part, just assigns dummy
+ // location
+ locAnnotationStr = "@LOC(\"LOC\")";
+ }
+ int fdLineNum = fd.getLineNum();
+ String orgFieldDeclarationStr = sourceVec.get(fdLineNum);
+ String fieldDeclaration = fd.toString();
+ fieldDeclaration = fieldDeclaration.substring(0, fieldDeclaration.length() - 1);
+
+ String annoatedStr = locAnnotationStr + " " + orgFieldDeclarationStr;
+ sourceVec.set(fdLineNum, annoatedStr);
+
+ }
+
+ while (!toAnalyzeMethodIsEmpty()) {
+ MethodDescriptor md = toAnalyzeMethodNext();
+ SSJavaLattice<String> methodLattice = md2lattice.get(md);
+ if (methodLattice != null) {
+
+ int methodDefLine = md.getLineNum();
+
+ MethodLocationInfo methodLocInfo = getMethodLocationInfo(md);
+
+ Map<Descriptor, CompositeLocation> methodInferLocMap =
+ methodLocInfo.getMapDescToInferLocation();
+ Set<Descriptor> localVarDescSet = methodInferLocMap.keySet();
+
+ for (Iterator iterator = localVarDescSet.iterator(); iterator.hasNext();) {
+ Descriptor localVarDesc = (Descriptor) iterator.next();
+ CompositeLocation inferLoc = methodInferLocMap.get(localVarDesc);
+
+ String locAnnotationStr = generateLocationAnnoatation(inferLoc);
+
+ if (!isParameter(md, localVarDesc)) {
+ if (mapDescToDefinitionLine.containsKey(localVarDesc)) {
+ int varLineNum = mapDescToDefinitionLine.get(localVarDesc);
+ String orgSourceLine = sourceVec.get(varLineNum);
+ int idx =
+ orgSourceLine.indexOf(generateVarDeclaration((VarDescriptor) localVarDesc));
+ assert (idx != -1);
+ String annoatedStr =
+ orgSourceLine.substring(0, idx) + locAnnotationStr + " "
+ + orgSourceLine.substring(idx);
+ sourceVec.set(varLineNum, annoatedStr);
+ }
+ } else {
+ String methodDefStr = sourceVec.get(methodDefLine);
+ int idx = methodDefStr.indexOf(generateVarDeclaration((VarDescriptor) localVarDesc));
+ assert (idx != -1);
+ String annoatedStr =
+ methodDefStr.substring(0, idx) + locAnnotationStr + " "
+ + methodDefStr.substring(idx);
+ sourceVec.set(methodDefLine, annoatedStr);
+ }
+
+ }
+
+ String methodLatticeDefStr = generateLatticeDefinition(md);
+ String annoatedStr = methodLatticeDefStr + newline + sourceVec.get(methodDefLine);
+ sourceVec.set(methodDefLine, annoatedStr);
+
+ }
+ }
+
+ }
+
+ codeGen();
+ }
+
+ private String generateVarDeclaration(VarDescriptor varDesc) {
+
+ TypeDescriptor td = varDesc.getType();
+ String rtr = td.toString();
+ if (td.isArray()) {
+ for (int i = 0; i < td.getArrayCount(); i++) {
+ rtr += "[]";
+ }
+ }
+ rtr += " " + varDesc.getName();
+ return rtr;
+
+ }
+
+ private String generateLocationAnnoatation(CompositeLocation loc) {
+ String rtr = "@LOC(\"";
+
+ // method location
+ Location methodLoc = loc.get(0);
+ rtr += methodLoc.getLocIdentifier();
+
+ for (int i = 1; i < loc.getSize(); i++) {
+ Location element = loc.get(i);
+ rtr += "," + element.getDescriptor().getSymbol() + "." + element.getLocIdentifier();
+ }
+
+ rtr += "\")";
+ return rtr;
+ }
+
+ private boolean isParameter(MethodDescriptor md, Descriptor localVarDesc) {
+ return getFlowGraph(md).isParamDesc(localVarDesc);
+ }
+
+ private String extractFileName(String fileName) {
+ int idx = fileName.lastIndexOf("/");
+ if (idx == -1) {
+ return fileName;
+ } else {
+ return fileName.substring(idx + 1);
+ }
+
+ }
+
+ private void codeGen() {
+
+ Set<String> originalFileNameSet = mapFileNameToLineVector.keySet();
+ for (Iterator iterator = originalFileNameSet.iterator(); iterator.hasNext();) {
+ String orgFileName = (String) iterator.next();
+ String outputFileName = extractFileName(orgFileName);
+
+ Vector<String> sourceVec = mapFileNameToLineVector.get(orgFileName);
+
+ try {
+
+ FileWriter fileWriter = new FileWriter("./infer/" + outputFileName);
+ BufferedWriter out = new BufferedWriter(fileWriter);
+
+ for (int i = 0; i < sourceVec.size(); i++) {
+ out.write(sourceVec.get(i));
+ out.newLine();
+ }
+ out.close();
+ } catch (IOException e) {
+ e.printStackTrace();
+ }
+
+ }
+
+ }
+
+ 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();
+ SSJavaLattice<String> methodLattice = md2lattice.get(md);
+ if (methodLattice != null) {
+ methodLattice.removeRedundantEdges();
+ }
+ }
+ }
+
+ }
+
+ private void checkLattices() {
+
+ LinkedList<MethodDescriptor> descriptorListToAnalyze = ssjava.getSortedDescriptors();
+
+ // current descriptors to visit in fixed-point interprocedural analysis,
+ // prioritized by
+ // dependency in the call graph
+ methodDescriptorsToVisitStack.clear();
+
+ descriptorListToAnalyze.removeFirst();
+
+ Set<MethodDescriptor> methodDescriptorToVistSet = new HashSet<MethodDescriptor>();
+ methodDescriptorToVistSet.addAll(descriptorListToAnalyze);
+
+ while (!descriptorListToAnalyze.isEmpty()) {
+ MethodDescriptor md = descriptorListToAnalyze.removeFirst();
+ checkLatticesOfVirtualMethods(md);
+ }
+
+ }
+
+ private void debug_writeLatticeDotFile() {
+ // generate lattice dot file
+
+ setupToAnalyze();
+
+ while (!toAnalyzeIsEmpty()) {
+ ClassDescriptor cd = toAnalyzeNext();
+
+ setupToAnalazeMethod(cd);
+
+ SSJavaLattice<String> classLattice = cd2lattice.get(cd);
+ if (classLattice != null) {
+ ssjava.writeLatticeDotFile(cd, null, classLattice);
+ debug_printDescriptorToLocNameMapping(cd);
+ }
+
+ while (!toAnalyzeMethodIsEmpty()) {
+ MethodDescriptor md = toAnalyzeMethodNext();
+ 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
+
+ LinkedList<MethodDescriptor> descriptorListToAnalyze = ssjava.getSortedDescriptors();
+
+ Collections.sort(descriptorListToAnalyze, new Comparator<MethodDescriptor>() {
+ public int compare(MethodDescriptor o1, MethodDescriptor o2) {
+ return o1.getSymbol().compareToIgnoreCase(o2.getSymbol());
+ }
+ });
+
+ // current descriptors to visit in fixed-point interprocedural analysis,
+ // prioritized by
+ // dependency in the call graph
+ methodDescriptorsToVisitStack.clear();
+
+ // descriptorListToAnalyze.removeFirst();
+
+ Set<MethodDescriptor> methodDescriptorToVistSet = new HashSet<MethodDescriptor>();
+ methodDescriptorToVistSet.addAll(descriptorListToAnalyze);
+
+ while (!descriptorListToAnalyze.isEmpty()) {
+ MethodDescriptor md = descriptorListToAnalyze.removeFirst();
+ methodDescriptorsToVisitStack.add(md);
+ }
+
+ // analyze scheduled methods until there are no more to visit
+ while (!methodDescriptorsToVisitStack.isEmpty()) {
+ // start to analyze leaf node
+ MethodDescriptor md = methodDescriptorsToVisitStack.pop();
+
+ SSJavaLattice<String> methodLattice =
+ new SSJavaLattice<String>(SSJavaAnalysis.TOP, SSJavaAnalysis.BOTTOM);
+
+ MethodLocationInfo methodInfo = new MethodLocationInfo(md);
+ curMethodInfo = methodInfo;
+
+ System.out.println();
+ System.out.println("SSJAVA: Inferencing the lattice from " + md);
+
+ try {
+ analyzeMethodLattice(md, methodLattice, methodInfo);
+ } catch (CyclicFlowException e) {
+ throw new Error("Fail to generate the method lattice for " + md);
+ }
+
+ SSJavaLattice<String> prevMethodLattice = getMethodLattice(md);
+ MethodLocationInfo prevMethodInfo = getMethodLocationInfo(md);
+
+ if ((!methodLattice.equals(prevMethodLattice)) || (!methodInfo.equals(prevMethodInfo))) {
+
+ setMethodLattice(md, methodLattice);
+ setMethodLocInfo(md, methodInfo);
+
+ // results for callee changed, so enqueue dependents caller for
+ // further analysis
+ Iterator<MethodDescriptor> depsItr = ssjava.getDependents(md).iterator();
+ while (depsItr.hasNext()) {
+ MethodDescriptor methodNext = depsItr.next();
+ if (!methodDescriptorsToVisitStack.contains(methodNext)
+ && methodDescriptorToVistSet.contains(methodNext)) {
+ methodDescriptorsToVisitStack.add(methodNext);
+ }
+ }
+
+ }
+
+ }
+ }
+
+ private void setMethodLocInfo(MethodDescriptor md, MethodLocationInfo methodInfo) {
+ mapMethodDescToMethodLocationInfo.put(md, methodInfo);
+ }
+
+ private void checkLatticesOfVirtualMethods(MethodDescriptor md) {
+
+ if (!md.isStatic()) {
+ Set<MethodDescriptor> setPossibleCallees = new HashSet<MethodDescriptor>();
+ setPossibleCallees.addAll(ssjava.getCallGraph().getMethods(md));
+
+ for (Iterator iterator = setPossibleCallees.iterator(); iterator.hasNext();) {
+ MethodDescriptor mdCallee = (MethodDescriptor) iterator.next();
+ if (!md.equals(mdCallee)) {
+ checkConsistency(md, mdCallee);
+ }
+ }
+
+ }
+
+ }
+
+ private void checkConsistency(MethodDescriptor md1, MethodDescriptor md2) {
+
+ // check that two lattice have the same relations between parameters(+PC
+ // LOC, GLOBAL_LOC RETURN LOC)
+
+ List<CompositeLocation> list1 = new ArrayList<CompositeLocation>();
+ List<CompositeLocation> list2 = new ArrayList<CompositeLocation>();
+
+ MethodLocationInfo locInfo1 = getMethodLocationInfo(md1);
+ MethodLocationInfo locInfo2 = getMethodLocationInfo(md2);
+
+ Map<Integer, CompositeLocation> paramMap1 = locInfo1.getMapParamIdxToInferLoc();
+ Map<Integer, CompositeLocation> paramMap2 = locInfo2.getMapParamIdxToInferLoc();
+
+ int numParam = locInfo1.getMapParamIdxToInferLoc().keySet().size();
+
+ // add location types of paramters
+ for (int idx = 0; idx < numParam; idx++) {
+ list1.add(paramMap1.get(Integer.valueOf(idx)));
+ list2.add(paramMap2.get(Integer.valueOf(idx)));
+ }
+
+ // add program counter location
+ list1.add(locInfo1.getPCLoc());
+ list2.add(locInfo2.getPCLoc());
+
+ if (!md1.getReturnType().isVoid()) {
+ // add return value location
+ CompositeLocation rtrLoc1 =
+ new CompositeLocation(new Location(md1, locInfo1.getReturnLocName()));
+ CompositeLocation rtrLoc2 =
+ new CompositeLocation(new Location(md2, locInfo2.getReturnLocName()));
+ list1.add(rtrLoc1);
+ list2.add(rtrLoc2);
+ }
+
+ // add global location type
+ if (md1.isStatic()) {
+ CompositeLocation globalLoc1 =
+ new CompositeLocation(new Location(md1, locInfo1.getGlobalLocName()));
+ CompositeLocation globalLoc2 =
+ new CompositeLocation(new Location(md2, locInfo2.getGlobalLocName()));
+ list1.add(globalLoc1);
+ list2.add(globalLoc2);
+ }
+
+ for (int i = 0; i < list1.size(); i++) {
+ CompositeLocation locA1 = list1.get(i);
+ CompositeLocation locA2 = list2.get(i);
+ for (int k = 0; k < list1.size(); k++) {
+ if (i != k) {
+ CompositeLocation locB1 = list1.get(k);
+ CompositeLocation locB2 = list2.get(k);
+ boolean r1 = isGreaterThan(getLattice(md1), locA1, locB1);
+
+ boolean r2 = isGreaterThan(getLattice(md1), locA2, locB2);
+
+ if (r1 != r2) {
+ throw new Error("The method " + md1 + " is not consistent with the method " + md2
+ + ".:: They have a different ordering relation between locations (" + locA1 + ","
+ + locB1 + ") and (" + locA2 + "," + locB2 + ").");
+ }
+ }
+ }
+ }
+
+ }
+
+ private String getSymbol(int idx, FlowNode node) {
+ Descriptor desc = node.getDescTuple().get(idx);
+ return desc.getSymbol();
+ }
+
+ private Descriptor getDescriptor(int idx, FlowNode node) {
+ Descriptor desc = node.getDescTuple().get(idx);
+ return desc;
+ }
+
+ private void analyzeMethodLattice(MethodDescriptor md, SSJavaLattice<String> methodLattice,
+ MethodLocationInfo methodInfo) throws CyclicFlowException {
+
+ // first take a look at method invocation nodes to newly added relations
+ // from the callee
+ analyzeLatticeMethodInvocationNode(md, methodLattice, methodInfo);
+
+ if (!md.isStatic()) {
+ // set the this location
+ String thisLocSymbol = md.getThis().getSymbol();
+ methodInfo.setThisLocName(thisLocSymbol);
+ }
+
+ // set the global location
+ methodInfo.setGlobalLocName(LocationInference.GLOBALLOC);
+ methodInfo.mapDescriptorToLocation(GLOBALDESC, new CompositeLocation(
+ new Location(md, GLOBALLOC)));
+
+ // visit each node of method flow graph
+ FlowGraph fg = getFlowGraph(md);
+ Set<FlowNode> nodeSet = fg.getNodeSet();
+
+ // for the method lattice, we need to look at the first element of
+ // NTuple<Descriptor>
+ for (Iterator iterator = nodeSet.iterator(); iterator.hasNext();) {
+ FlowNode srcNode = (FlowNode) iterator.next();
+
+ Set<FlowEdge> outEdgeSet = srcNode.getOutEdgeSet();
+ for (Iterator iterator2 = outEdgeSet.iterator(); iterator2.hasNext();) {
+ FlowEdge outEdge = (FlowEdge) iterator2.next();
+ FlowNode dstNode = outEdge.getDst();
+
+ NTuple<Descriptor> srcNodeTuple = srcNode.getDescTuple();
+ NTuple<Descriptor> dstNodeTuple = dstNode.getDescTuple();
+
+ if (outEdge.getInitTuple().equals(srcNodeTuple)
+ && outEdge.getEndTuple().equals(dstNodeTuple)) {
+
+ if ((srcNodeTuple.size() > 1 && dstNodeTuple.size() > 1)
+ && srcNodeTuple.get(0).equals(dstNodeTuple.get(0))) {
+
+ // value flows between fields
+ Descriptor desc = srcNodeTuple.get(0);
+ ClassDescriptor classDesc;
+
+ if (desc.equals(GLOBALDESC)) {
+ classDesc = md.getClassDesc();
+ } else {
+ VarDescriptor varDesc = (VarDescriptor) srcNodeTuple.get(0);
+ classDesc = varDesc.getType().getClassDesc();
+ }
+ extractRelationFromFieldFlows(classDesc, srcNode, dstNode, 1);
+
+ } else {
+ // value flow between local var - local var or local var - field
+ addRelationToLattice(md, methodLattice, methodInfo, srcNode, dstNode);
+ }
+
+ // else if (srcNodeTuple.size() == 1 || dstNodeTuple.size() == 1) {
+ // // for the method lattice, we need to look at the first element of
+ // // NTuple<Descriptor>
+ // // 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, 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);
+ // }
+ // }
+
+ }
+ }
+ }
+
+ for (Iterator iterator = nodeSet.iterator(); iterator.hasNext();) {
+ FlowNode flowNode = (FlowNode) iterator.next();
+ if (flowNode.isDeclaratonNode()) {
+ CompositeLocation inferLoc = methodInfo.getInferLocation(flowNode.getDescTuple().get(0));
+ String locIdentifier = inferLoc.get(0).getLocIdentifier();
+ if (!methodLattice.containsKey(locIdentifier)) {
+ methodLattice.put(locIdentifier);
+ }
+
+ }
+ }
+
+ // create mapping from param idx to inferred composite location
+
+ int offset;
+ if (!md.isStatic()) {
+ // add 'this' reference location
+ offset = 1;
+ methodInfo.addMapParamIdxToInferLoc(0, methodInfo.getInferLocation(md.getThis()));
+ } else {
+ offset = 0;
+ }
+
+ for (int idx = 0; idx < md.numParameters(); idx++) {
+ Descriptor paramDesc = md.getParameter(idx);
+ CompositeLocation inferParamLoc = methodInfo.getInferLocation(paramDesc);
+ methodInfo.addMapParamIdxToInferLoc(idx + offset, inferParamLoc);
+ }
+
+ // calculate the initial program counter location
+ // PC location is higher than location types of all parameters
+ String pcLocSymbol = "PCLOC";
+ Map<Integer, CompositeLocation> mapParamToLoc = methodInfo.getMapParamIdxToInferLoc();
+ Set<Integer> keySet = mapParamToLoc.keySet();
+ for (Iterator iterator = keySet.iterator(); iterator.hasNext();) {
+ Integer paramIdx = (Integer) iterator.next();
+ CompositeLocation inferLoc = mapParamToLoc.get(paramIdx);
+ String paramLocLocalSymbol = inferLoc.get(0).getLocIdentifier();
+ if (!methodLattice.isGreaterThan(pcLocSymbol, paramLocLocalSymbol)) {
+ addRelationHigherToLower(methodLattice, methodInfo, pcLocSymbol, paramLocLocalSymbol);
+ }
+ }
+
+ // calculate a return location
+ // the return location type is lower than all parameters
+ if (!md.getReturnType().isVoid()) {
+
+ String returnLocSymbol = "RETURNLOC";
+
+ for (Iterator iterator = keySet.iterator(); iterator.hasNext();) {
+ Integer paramIdx = (Integer) iterator.next();
+ CompositeLocation inferLoc = mapParamToLoc.get(paramIdx);
+ String paramLocLocalSymbol = inferLoc.get(0).getLocIdentifier();
+ if (!methodLattice.isGreaterThan(paramLocLocalSymbol, returnLocSymbol)) {
+ addRelationHigherToLower(methodLattice, methodInfo, paramLocLocalSymbol, returnLocSymbol);
+ }
+ }
+ }
+
+ }
+
+ private boolean isGreaterThan(SSJavaLattice<String> methodLattice, CompositeLocation comp1,
+ CompositeLocation comp2) {
+
+ int size = comp1.getSize() >= comp2.getSize() ? comp2.getSize() : comp1.getSize();
+
+ for (int idx = 0; idx < size; idx++) {
+ Location loc1 = comp1.get(idx);
+ Location loc2 = comp2.get(idx);
+
+ Descriptor desc1 = loc1.getDescriptor();
+ Descriptor desc2 = loc2.getDescriptor();
+
+ if (!desc1.equals(desc2)) {
+ throw new Error("Fail to compare " + comp1 + " and " + comp2);
+ }
+
+ String symbol1 = loc1.getLocIdentifier();
+ String symbol2 = loc2.getLocIdentifier();
+
+ SSJavaLattice<String> lattice;
+ if (idx == 0) {
+ lattice = methodLattice;
+ } else {
+ lattice = getLattice(desc1);
+ }
+ if (symbol1.equals(symbol2)) {
+ continue;
+ } else if (lattice.isGreaterThan(symbol1, symbol2)) {
+ return true;
+ } else {
+ return false;
+ }
+
+ }
+
+ return false;
+ }
+
+ private void recursiveAddRelationToLattice(int idx, MethodDescriptor md,
+ CompositeLocation srcInferLoc, CompositeLocation dstInferLoc) throws CyclicFlowException {
+
+ 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,
+ SSJavaLattice<String> methodLattice, MethodLocationInfo methodInfo)
+ throws CyclicFlowException {
+
+ // the transformation for a call site propagates all relations between
+ // parameters from the callee
+ // if the method is virtual, it also grab all relations from any possible
+ // callees
+
+ Set<MethodInvokeNode> setMethodInvokeNode =
+ mapMethodDescriptorToMethodInvokeNodeSet.get(mdCaller);
+
+ if (setMethodInvokeNode != null) {
+
+ for (Iterator iterator = setMethodInvokeNode.iterator(); iterator.hasNext();) {
+ MethodInvokeNode min = (MethodInvokeNode) iterator.next();
+ MethodDescriptor mdCallee = min.getMethod();
+ Set<MethodDescriptor> setPossibleCallees = new HashSet<MethodDescriptor>();
+ if (mdCallee.isStatic()) {
+ setPossibleCallees.add(mdCallee);
+ } else {
+ Set<MethodDescriptor> calleeSet = ssjava.getCallGraph().getMethods(mdCallee);
+ // removes method descriptors that are not invoked by the caller
+ calleeSet.retainAll(mapMethodToCalleeSet.get(mdCaller));
+ setPossibleCallees.addAll(calleeSet);
+ }
+
+ for (Iterator iterator2 = setPossibleCallees.iterator(); iterator2.hasNext();) {
+ MethodDescriptor possibleMdCallee = (MethodDescriptor) iterator2.next();
+ propagateRelationToCaller(min, mdCaller, possibleMdCallee, methodLattice, methodInfo);
+ }
+
+ }
+ }
+
+ }
+
+ private void propagateRelationToCaller(MethodInvokeNode min, MethodDescriptor mdCaller,
+ MethodDescriptor possibleMdCallee, SSJavaLattice<String> methodLattice,
+ MethodLocationInfo methodInfo) throws CyclicFlowException {
+
+ SSJavaLattice<String> calleeLattice = getMethodLattice(possibleMdCallee);
+ MethodLocationInfo calleeLocInfo = getMethodLocationInfo(possibleMdCallee);
+ FlowGraph calleeFlowGraph = getFlowGraph(possibleMdCallee);
+
+ int numParam = calleeLocInfo.getNumParam();
+ for (int i = 0; i < numParam; i++) {
+ CompositeLocation param1 = calleeLocInfo.getParamCompositeLocation(i);
+ for (int k = 0; k < numParam; k++) {
+ if (i != k) {
+ CompositeLocation param2 = calleeLocInfo.getParamCompositeLocation(k);
+ if (isGreaterThan(getLattice(possibleMdCallee), param1, param2)) {
+ NodeTupleSet argDescTupleSet1 = getNodeTupleSetByArgIdx(min, i);
+ NodeTupleSet argDescTupleSet2 = getNodeTupleSetByArgIdx(min, k);
+
+ // the callee has the relation in which param1 is higher than param2
+ // therefore, the caller has to have the relation in which arg1 is
+ // higher than arg2
+
+ for (Iterator<NTuple<Descriptor>> iterator = argDescTupleSet1.iterator(); iterator
+ .hasNext();) {
+ NTuple<Descriptor> argDescTuple1 = iterator.next();
+
+ for (Iterator<NTuple<Descriptor>> iterator2 = argDescTupleSet2.iterator(); iterator2
+ .hasNext();) {
+ NTuple<Descriptor> argDescTuple2 = iterator2.next();
+
+ // retreive inferred location by the local var descriptor
+
+ NTuple<Location> tuple1 = getFlowGraph(mdCaller).getLocationTuple(argDescTuple1);
+ NTuple<Location> tuple2 = getFlowGraph(mdCaller).getLocationTuple(argDescTuple2);
+
+ // CompositeLocation higherInferLoc =
+ // methodInfo.getInferLocation(argTuple1.get(0));
+ // CompositeLocation lowerInferLoc =
+ // methodInfo.getInferLocation(argTuple2.get(0));
+
+ CompositeLocation inferLoc1 = generateInferredCompositeLocation(methodInfo, tuple1);
+ CompositeLocation inferLoc2 = generateInferredCompositeLocation(methodInfo, tuple2);
+
+ // addRelation(methodLattice, methodInfo, inferLoc1, inferLoc2);
+
+ addFlowGraphEdge(mdCaller, argDescTuple1, argDescTuple2);
+
+ }
+
+ }
+
+ }
+ }
+ }
+ }
+
+ }
+
+ private CompositeLocation generateInferredCompositeLocation(MethodLocationInfo methodInfo,
+ NTuple<Location> tuple) {
+
+ // first, retrieve inferred location by the local var descriptor
+ CompositeLocation inferLoc = new CompositeLocation();
+
+ CompositeLocation localVarInferLoc =
+ methodInfo.getInferLocation(tuple.get(0).getLocDescriptor());
+
+ localVarInferLoc.get(0).setLocDescriptor(tuple.get(0).getLocDescriptor());
+
+ for (int i = 0; i < localVarInferLoc.getSize(); i++) {
+ inferLoc.addLocation(localVarInferLoc.get(i));
+ }
+ // System.out.println("@@@@@localVarInferLoc=" + localVarInferLoc);
+
+ for (int i = 1; i < tuple.size(); i++) {
+ Location cur = tuple.get(i);
+ Descriptor enclosingDesc = cur.getDescriptor();
+ Descriptor curDesc = cur.getLocDescriptor();
+
+ Location inferLocElement;
+ if (curDesc == null) {
+ // in this case, we have a newly generated location.
+ // System.out.println("!!! generated location=" +
+ // cur.getLocIdentifier());
+ inferLocElement = new Location(enclosingDesc, cur.getLocIdentifier());
+ } else {
+ String fieldLocSymbol =
+ getLocationInfo(enclosingDesc).getInferLocation(curDesc).get(0).getLocIdentifier();
+ inferLocElement = new Location(enclosingDesc, fieldLocSymbol);
+ inferLocElement.setLocDescriptor(curDesc);
+ }
+
+ inferLoc.addLocation(inferLocElement);
+
+ }
+
+ assert (inferLoc.get(0).getLocDescriptor().getSymbol() == inferLoc.get(0).getLocIdentifier());
+ return inferLoc;
+ }
+
+ private void addRelation(SSJavaLattice<String> methodLattice, MethodLocationInfo methodInfo,
+ CompositeLocation srcInferLoc, CompositeLocation dstInferLoc) throws CyclicFlowException {
+
+ System.out.println("addRelation --- srcInferLoc=" + srcInferLoc + " dstInferLoc="
+ + dstInferLoc);
+ String srcLocalLocSymbol = srcInferLoc.get(0).getLocIdentifier();
+ String dstLocalLocSymbol = dstInferLoc.get(0).getLocIdentifier();
+
+ if (srcInferLoc.getSize() == 1 && dstInferLoc.getSize() == 1) {
+ // add a new relation to the local lattice
+ addRelationHigherToLower(methodLattice, methodInfo, srcLocalLocSymbol, dstLocalLocSymbol);
+ } else if (srcInferLoc.getSize() > 1 && dstInferLoc.getSize() > 1) {
+ // both src and dst have assigned to a composite location
+
+ if (!srcLocalLocSymbol.equals(dstLocalLocSymbol)) {
+ addRelationHigherToLower(methodLattice, methodInfo, srcLocalLocSymbol, dstLocalLocSymbol);
+ } else {
+ recursivelyAddRelation(1, srcInferLoc, dstInferLoc);
+ }
+ } else {
+ // either src or dst has assigned to a composite location
+ if (!srcLocalLocSymbol.equals(dstLocalLocSymbol)) {
+ addRelationHigherToLower(methodLattice, methodInfo, srcLocalLocSymbol, dstLocalLocSymbol);
+ }
+ }
+
+ System.out.println();
+
+ }
+
+ public LocationInfo getLocationInfo(Descriptor d) {
+ if (d instanceof MethodDescriptor) {
+ return getMethodLocationInfo((MethodDescriptor) d);
+ } else {
+ return getFieldLocationInfo((ClassDescriptor) d);
+ }
+ }
+
+ private MethodLocationInfo getMethodLocationInfo(MethodDescriptor md) {
+
+ if (!mapMethodDescToMethodLocationInfo.containsKey(md)) {
+ mapMethodDescToMethodLocationInfo.put(md, new MethodLocationInfo(md));
+ }
+
+ return mapMethodDescToMethodLocationInfo.get(md);
+
+ }
+
+ private LocationInfo getFieldLocationInfo(ClassDescriptor cd) {
+
+ if (!mapClassToLocationInfo.containsKey(cd)) {
+ mapClassToLocationInfo.put(cd, new LocationInfo(cd));
+ }
+
+ return mapClassToLocationInfo.get(cd);
+
+ }
+
+ private void addRelationToLattice(MethodDescriptor md, SSJavaLattice<String> methodLattice,
+ MethodLocationInfo methodInfo, FlowNode srcNode, FlowNode dstNode) throws CyclicFlowException {
+
+ System.out.println();
+ System.out.println("### addRelationToLattice src=" + srcNode + " dst=" + dstNode);
+
+ // add a new binary relation of dstNode < srcNode
+ FlowGraph flowGraph = getFlowGraph(md);
+ try {
+ System.out.println("***** src composite case::");
+ calculateCompositeLocation(flowGraph, methodLattice, methodInfo, srcNode);
+
+ CompositeLocation srcInferLoc =
+ generateInferredCompositeLocation(methodInfo, flowGraph.getLocationTuple(srcNode));
+ CompositeLocation dstInferLoc =
+ generateInferredCompositeLocation(methodInfo, flowGraph.getLocationTuple(dstNode));
+ addRelation(methodLattice, methodInfo, srcInferLoc, dstInferLoc);
+ } catch (CyclicFlowException e) {
+ // there is a cyclic value flow... try to calculate a composite location
+ // for the destination node
+ System.out.println("***** dst composite case::");
+ calculateCompositeLocation(flowGraph, methodLattice, methodInfo, dstNode);
+ CompositeLocation srcInferLoc =
+ generateInferredCompositeLocation(methodInfo, flowGraph.getLocationTuple(srcNode));
+ CompositeLocation dstInferLoc =
+ generateInferredCompositeLocation(methodInfo, flowGraph.getLocationTuple(dstNode));
+ try {
+ addRelation(methodLattice, methodInfo, srcInferLoc, dstInferLoc);
+ } catch (CyclicFlowException e1) {
+ throw new Error("Failed to merge cyclic value flows into a shared location.");
+ }
+ }
+
+ }
+
+ private void recursivelyAddRelation(int idx, CompositeLocation srcInferLoc,
+ CompositeLocation dstInferLoc) throws CyclicFlowException {
+
+ String srcLocSymbol = srcInferLoc.get(idx).getLocIdentifier();
+ String dstLocSymbol = dstInferLoc.get(idx).getLocIdentifier();
+
+ Descriptor parentDesc = srcInferLoc.get(idx).getDescriptor();
+
+ if (srcLocSymbol.equals(dstLocSymbol)) {
+ // check if it is the case of shared location
+ if (srcInferLoc.getSize() == (idx + 1) && dstInferLoc.getSize() == (idx + 1)) {
+ Location inferLocElement = srcInferLoc.get(idx);
+ System.out.println("SET SHARED LOCATION=" + inferLocElement);
+ getLattice(inferLocElement.getDescriptor())
+ .addSharedLoc(inferLocElement.getLocIdentifier());
+ } else if (srcInferLoc.getSize() > (idx + 1) && dstInferLoc.getSize() > (idx + 1)) {
+ recursivelyAddRelation(idx + 1, srcInferLoc, dstInferLoc);
+ }
+ } else {
+ addRelationHigherToLower(getLattice(parentDesc), getLocationInfo(parentDesc), srcLocSymbol,
+ dstLocSymbol);
+ }
+ }
+
+ private void recursivelyAddCompositeRelation(MethodDescriptor md, FlowGraph flowGraph,
+ MethodLocationInfo methodInfo, FlowNode srcNode, FlowNode dstNode, Descriptor srcDesc,
+ Descriptor dstDesc) throws CyclicFlowException {
+
+ 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);
+ }
+
+ 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,
+ NTuple<Location> prefix, NTuple<Location> element) {
+
+ if (!map.containsKey(prefix)) {
+ map.put(prefix, new HashSet<NTuple<Location>>());
+ }
+ map.get(prefix).add(element);
+ }
+
+ private boolean calculateCompositeLocation(FlowGraph flowGraph,
+ SSJavaLattice<String> methodLattice, MethodLocationInfo methodInfo, FlowNode flowNode)
+ throws CyclicFlowException {
+
+ Descriptor localVarDesc = flowNode.getDescTuple().get(0);
+ NTuple<Location> flowNodelocTuple = flowGraph.getLocationTuple(flowNode);
+
+ if (localVarDesc.equals(methodInfo.getMethodDesc())) {
+ return false;
+ }
+
+ 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>>>();
+
+ List<NTuple<Location>> prefixList = new ArrayList<NTuple<Location>>();
+
+ for (Iterator iterator = inNodeSet.iterator(); iterator.hasNext();) {
+ FlowNode inNode = (FlowNode) iterator.next();
+ NTuple<Location> inNodeTuple = flowGraph.getLocationTuple(inNode);
+
+ CompositeLocation inNodeInferredLoc =
+ generateInferredCompositeLocation(methodInfo, inNodeTuple);
+
+ NTuple<Location> inNodeInferredLocTuple = inNodeInferredLoc.getTuple();
+
+ for (int i = 1; i < inNodeInferredLocTuple.size(); i++) {
+ NTuple<Location> prefix = inNodeInferredLocTuple.subList(0, i);
+ if (!prefixList.contains(prefix)) {
+ prefixList.add(prefix);
+ }
+ addPrefixMapping(mapPrefixToIncomingLocTupleSet, prefix, inNodeInferredLocTuple);
+ }
+ }
+
+ Collections.sort(prefixList, new Comparator<NTuple<Location>>() {
+ public int compare(NTuple<Location> arg0, NTuple<Location> arg1) {
+ int s0 = arg0.size();
+ int s1 = arg1.size();
+ if (s0 > s1) {
+ return -1;
+ } else if (s0 == s1) {
+ return 0;
+ } else {
+ return 1;
+ }
+ }
+ });
+
+ // find out reachable nodes that have the longest common prefix
+ for (int i = 0; i < prefixList.size(); i++) {
+ NTuple<Location> curPrefix = prefixList.get(i);
+ Set<NTuple<Location>> reachableCommonPrefixSet = new HashSet<NTuple<Location>>();
+
+ for (Iterator iterator2 = reachableNodeSet.iterator(); iterator2.hasNext();) {
+ FlowNode reachableNode = (FlowNode) iterator2.next();
+ NTuple<Location> reachLocTuple = flowGraph.getLocationTuple(reachableNode);
+ CompositeLocation reachLocInferLoc =
+ generateInferredCompositeLocation(methodInfo, reachLocTuple);
+ if (reachLocInferLoc.getTuple().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);
+
+ int idx = curPrefix.size();
+ NTuple<Location> element = incomingCommonPrefixSet.iterator().next();
+ Descriptor desc = element.get(idx).getDescriptor();
+
+ SSJavaLattice<String> lattice = getLattice(desc);
+ LocationInfo locInfo = getLocationInfo(desc);
+
+ CompositeLocation inferLocation =
+ generateInferredCompositeLocation(methodInfo, flowNodelocTuple);
+
+ // methodInfo.getInferLocation(localVarDesc);
+ CompositeLocation newInferLocation = new CompositeLocation();
+
+ if (inferLocation.getTuple().startsWith(curPrefix)) {
+ // the same infer location is already existed. no need to do
+ // anything
+ return true;
+ } else {
+ // assign a new composite location
+
+ // String oldMethodLocationSymbol =
+ // inferLocation.get(0).getLocIdentifier();
+ String newLocSymbol = "Loc" + (SSJavaLattice.seed++);
+ for (int locIdx = 0; locIdx < curPrefix.size(); locIdx++) {
+ newInferLocation.addLocation(curPrefix.get(locIdx));
+ }
+ Location newLocationElement = new Location(desc, newLocSymbol);
+ newInferLocation.addLocation(newLocationElement);
+
+ // maps local variable to location types of the common prefix
+ methodInfo.mapDescriptorToLocation(localVarDesc, newInferLocation.clone());
+
+ // methodInfo.mapDescriptorToLocation(localVarDesc, newInferLocation);
+ addMapLocSymbolToInferredLocation(methodInfo.getMethodDesc(), localVarDesc,
+ newInferLocation);
+ methodInfo.removeMaplocalVarToLocSet(localVarDesc);
+
+ // add the field/var descriptor to the set of the location symbol
+ int lastIdx = flowNode.getDescTuple().size() - 1;
+ Descriptor lastFlowNodeDesc = flowNode.getDescTuple().get(lastIdx);
+ Descriptor enclosinglastLastFlowNodeDesc = flowNodelocTuple.get(lastIdx).getDescriptor();
+
+ CompositeLocation newlyInferredLocForFlowNode =
+ generateInferredCompositeLocation(methodInfo, flowNodelocTuple);
+ Location lastInferLocElement =
+ newlyInferredLocForFlowNode.get(newlyInferredLocForFlowNode.getSize() - 1);
+ Descriptor enclosingLastInferLocElement = lastInferLocElement.getDescriptor();
+
+ // getLocationInfo(enclosingLastInferLocElement).addMapLocSymbolToDescSet(
+ // lastInferLocElement.getLocIdentifier(), lastFlowNodeDesc);
+ getLocationInfo(enclosingLastInferLocElement).addMapLocSymbolToRelatedInferLoc(
+ lastInferLocElement.getLocIdentifier(), enclosinglastLastFlowNodeDesc,
+ lastFlowNodeDesc);
+
+ // clean up the previous location
+ // Location prevInferLocElement =
+ // inferLocation.get(inferLocation.getSize() - 1);
+ // Descriptor prevEnclosingDesc = prevInferLocElement.getDescriptor();
+ //
+ // SSJavaLattice<String> targetLattice;
+ // LocationInfo targetInfo;
+ // if (prevEnclosingDesc.equals(methodInfo.getMethodDesc())) {
+ // targetLattice = methodLattice;
+ // targetInfo = methodInfo;
+ // } else {
+ // targetLattice = getLattice(prevInferLocElement.getDescriptor());
+ // targetInfo = getLocationInfo(prevInferLocElement.getDescriptor());
+ // }
+ //
+ // Set<Pair<Descriptor, Descriptor>> associstedDescSet =
+ // targetInfo.getRelatedInferLocSet(prevInferLocElement.getLocIdentifier());
+ //
+ // if (associstedDescSet.size() == 1) {
+ // targetLattice.remove(prevInferLocElement.getLocIdentifier());
+ // } else {
+ // associstedDescSet.remove(lastFlowNodeDesc);
+ // }
+
+ }
+
+ System.out.println("ASSIGN NEW COMPOSITE LOCATION =" + newInferLocation + " to "
+ + flowNode);
+
+ String newlyInsertedLocName =
+ newInferLocation.get(newInferLocation.getSize() - 1).getLocIdentifier();
+
+ System.out.println("-- add in-flow");
+ for (Iterator iterator = incomingCommonPrefixSet.iterator(); iterator.hasNext();) {
+ NTuple<Location> tuple = (NTuple<Location>) iterator.next();
+ Location loc = tuple.get(idx);
+ String higher = loc.getLocIdentifier();
+ addRelationHigherToLower(lattice, locInfo, higher, newlyInsertedLocName);
+ }
+
+ System.out.println("-- add out flow");
+ for (Iterator iterator = reachableCommonPrefixSet.iterator(); iterator.hasNext();) {
+ NTuple<Location> tuple = (NTuple<Location>) iterator.next();
+ if (tuple.size() > idx) {
+ Location loc = tuple.get(idx);
+ String lower = loc.getLocIdentifier();
+ // String lower =
+ // locInfo.getFieldInferLocation(loc.getLocDescriptor()).getLocIdentifier();
+ addRelationHigherToLower(lattice, locInfo, newlyInsertedLocName, lower);
+ }
+ }
+
+ return true;
+ }
+
+ }
+
+ return false;
+
}
- public void setupToAnalyze() {
- SymbolTable classtable = state.getClassSymbolTable();
- toanalyzeList.clear();
- toanalyzeList.addAll(classtable.getValueSet());
- Collections.sort(toanalyzeList, new Comparator<ClassDescriptor>() {
- public int compare(ClassDescriptor o1, ClassDescriptor o2) {
- return o1.getClassName().compareToIgnoreCase(o2.getClassName());
+ private void addMapLocSymbolToInferredLocation(MethodDescriptor md, Descriptor localVar,
+ CompositeLocation inferLoc) {
+
+ Location locElement = inferLoc.get((inferLoc.getSize() - 1));
+ Descriptor enclosingDesc = locElement.getDescriptor();
+ LocationInfo locInfo = getLocationInfo(enclosingDesc);
+ locInfo.addMapLocSymbolToRelatedInferLoc(locElement.getLocIdentifier(), md, localVar);
+ }
+
+ 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.equals(LocationInference.GLOBALDESC)) {
+ return true;
+ } else 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;
}
- public void setupToAnalazeMethod(ClassDescriptor cd) {
+ private void addRelationHigherToLower(SSJavaLattice<String> lattice, LocationInfo locInfo,
+ String higher, String lower) throws CyclicFlowException {
- SymbolTable methodtable = cd.getMethodTable();
- toanalyzeMethodList.clear();
- toanalyzeMethodList.addAll(methodtable.getValueSet());
- Collections.sort(toanalyzeMethodList, new Comparator<MethodDescriptor>() {
- public int compare(MethodDescriptor o1, MethodDescriptor o2) {
- return o1.getSymbol().compareToIgnoreCase(o2.getSymbol());
+ System.out.println("---addRelationHigherToLower " + higher + " -> " + lower
+ + " to the lattice of " + locInfo.getDescIdentifier());
+ // if (higher.equals(lower) && lattice.isSharedLoc(higher)) {
+ // return;
+ // }
+ 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) {
+ System.out.println("#Check cycle= " + lower + " < " + higher + " cycleElementSet="
+ + cycleElementSet);
+ // if there is non-primitive element in the cycle, no way to merge cyclic
+ // elements into the shared location
+ throw new CyclicFlowException();
+ }
+
+ if (cycleElementSet.size() > 0) {
+
+ String newSharedLoc = "SharedLoc" + (SSJavaLattice.seed++);
+
+ System.out.println("---ASSIGN NEW SHARED LOC=" + newSharedLoc + " to " + cycleElementSet);
+ lattice.mergeIntoSharedLocation(cycleElementSet, newSharedLoc);
+
+ for (Iterator iterator = cycleElementSet.iterator(); iterator.hasNext();) {
+ String oldLocSymbol = (String) iterator.next();
+
+ Set<Pair<Descriptor, Descriptor>> inferLocSet = locInfo.getRelatedInferLocSet(oldLocSymbol);
+ System.out.println("---update related locations=" + inferLocSet);
+ for (Iterator iterator2 = inferLocSet.iterator(); iterator2.hasNext();) {
+ Pair<Descriptor, Descriptor> pair = (Pair<Descriptor, Descriptor>) iterator2.next();
+ Descriptor enclosingDesc = pair.getFirst();
+ Descriptor desc = pair.getSecond();
+
+ CompositeLocation inferLoc;
+ if (curMethodInfo.md.equals(enclosingDesc)) {
+ inferLoc = curMethodInfo.getInferLocation(desc);
+ } else {
+ inferLoc = getLocationInfo(enclosingDesc).getInferLocation(desc);
+ }
+
+ Location locElement = inferLoc.get(inferLoc.getSize() - 1);
+
+ locElement.setLocIdentifier(newSharedLoc);
+ locInfo.addMapLocSymbolToRelatedInferLoc(newSharedLoc, enclosingDesc, desc);
+
+ if (curMethodInfo.md.equals(enclosingDesc)) {
+ inferLoc = curMethodInfo.getInferLocation(desc);
+ } else {
+ inferLoc = getLocationInfo(enclosingDesc).getInferLocation(desc);
+ }
+ System.out.println("---New Infer Loc=" + inferLoc);
+
+ }
+ locInfo.removeRelatedInferLocSet(oldLocSymbol, newSharedLoc);
+
+ }
+
+ lattice.addSharedLoc(newSharedLoc);
+
+ } else if (!lattice.isGreaterThan(higher, lower)) {
+ lattice.addRelationHigherToLower(higher, lower);
+ }
}
- public boolean toAnalyzeMethodIsEmpty() {
- return toanalyzeMethodList.isEmpty();
+ private void replaceOldLocWithNewLoc(SSJavaLattice<String> methodLattice, String oldLocSymbol,
+ String newLocSymbol) {
+
+ if (methodLattice.containsKey(oldLocSymbol)) {
+ methodLattice.substituteLocation(oldLocSymbol, newLocSymbol);
+ }
+
}
- public boolean toAnalyzeIsEmpty() {
- return toanalyzeList.isEmpty();
+ private void prefixSanityCheck(List<NTuple<Location>> prefixList, int curIdx,
+ FlowGraph flowGraph, Set<FlowNode> reachableNodeSet) {
+
+ 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 ClassDescriptor toAnalyzeNext() {
- return toanalyzeList.remove(0);
+ public boolean isPrimitiveLocalVariable(FlowNode node) {
+ VarDescriptor varDesc = (VarDescriptor) node.getDescTuple().get(0);
+ return varDesc.getType().isPrimitive();
}
- public MethodDescriptor toAnalyzeMethodNext() {
- return toanalyzeMethodList.remove(0);
+ private SSJavaLattice<String> getLattice(Descriptor d) {
+ if (d instanceof MethodDescriptor) {
+ return getMethodLattice((MethodDescriptor) d);
+ } else {
+ return getFieldLattice((ClassDescriptor) d);
+ }
}
- public void inference() {
+ private SSJavaLattice<String> getMethodLattice(MethodDescriptor md) {
+ if (!md2lattice.containsKey(md)) {
+ md2lattice.put(md, new SSJavaLattice<String>(SSJavaAnalysis.TOP, SSJavaAnalysis.BOTTOM));
+ }
+ return md2lattice.get(md);
+ }
+
+ private void setMethodLattice(MethodDescriptor md, SSJavaLattice<String> lattice) {
+ md2lattice.put(md, lattice);
+ }
+
+ private void extractRelationFromFieldFlows(ClassDescriptor cd, FlowNode srcNode,
+ FlowNode dstNode, int idx) throws CyclicFlowException {
+
+ 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
+ // for this case
+
+ Descriptor desc = srcNode.getDescTuple().get(idx);
+ ClassDescriptor classDesc;
+
+ if (idx == 0) {
+ classDesc = ((VarDescriptor) desc).getType().getClassDesc();
+ } else {
+ classDesc = ((FieldDescriptor) desc).getType().getClassDesc();
+ }
- // 2) construct value flow graph
+ extractRelationFromFieldFlows(classDesc, srcNode, dstNode, idx + 1);
+
+ } else {
+
+ Descriptor srcFieldDesc = srcNode.getDescTuple().get(idx);
+ Descriptor dstFieldDesc = dstNode.getDescTuple().get(idx);
+
+ // add a new binary relation of dstNode < srcNode
+ SSJavaLattice<String> fieldLattice = getFieldLattice(cd);
+ LocationInfo fieldInfo = getFieldLocationInfo(cd);
+
+ String srcSymbol = fieldInfo.getFieldInferLocation(srcFieldDesc).getLocIdentifier();
+ String dstSymbol = fieldInfo.getFieldInferLocation(dstFieldDesc).getLocIdentifier();
+
+ addRelationHigherToLower(fieldLattice, fieldInfo, srcSymbol, dstSymbol);
+
+ }
+
+ }
+
+ public SSJavaLattice<String> getFieldLattice(ClassDescriptor cd) {
+ if (!cd2lattice.containsKey(cd)) {
+ cd2lattice.put(cd, new SSJavaLattice<String>(SSJavaAnalysis.TOP, SSJavaAnalysis.BOTTOM));
+ }
+ return cd2lattice.get(cd);
+ }
+
+ public void constructFlowGraph() {
setupToAnalyze();
+ Set<MethodDescriptor> visited = new HashSet<MethodDescriptor>();
+ Set<MethodDescriptor> reachableCallee = new HashSet<MethodDescriptor>();
+
while (!toAnalyzeIsEmpty()) {
ClassDescriptor cd = toAnalyzeNext();
setupToAnalazeMethod(cd);
+ toanalyzeMethodList.removeAll(visited);
+
while (!toAnalyzeMethodIsEmpty()) {
MethodDescriptor md = toAnalyzeMethodNext();
- if (ssjava.needTobeAnnotated(md)) {
+ if ((!visited.contains(md))
+ && (ssjava.needTobeAnnotated(md) || reachableCallee.contains(md))) {
if (state.SSJAVADEBUG) {
+ System.out.println();
System.out.println("SSJAVA: Constructing a flow graph: " + md);
}
- FlowGraph fg = new FlowGraph(md);
+
+ // creates a mapping from a method descriptor to virtual methods
+ Set<MethodDescriptor> setPossibleCallees = new HashSet<MethodDescriptor>();
+ if (md.isStatic()) {
+ setPossibleCallees.add(md);
+ } else {
+ setPossibleCallees.addAll(ssjava.getCallGraph().getMethods(md));
+ }
+
+ Set<MethodDescriptor> calleeSet = ssjava.getCallGraph().getCalleeSet(md);
+ Set<MethodDescriptor> needToAnalyzeCalleeSet = new HashSet<MethodDescriptor>();
+
+ for (Iterator iterator = calleeSet.iterator(); iterator.hasNext();) {
+ MethodDescriptor calleemd = (MethodDescriptor) iterator.next();
+ if ((!ssjava.isTrustMethod(calleemd))
+ && (!ssjava.isSSJavaUtil(calleemd.getClassDesc()))) {
+ if (!visited.contains(calleemd)) {
+ toanalyzeMethodList.add(calleemd);
+ }
+ reachableCallee.add(calleemd);
+ needToAnalyzeCalleeSet.add(calleemd);
+ }
+ }
+
+ mapMethodToCalleeSet.put(md, needToAnalyzeCalleeSet);
+
+ // creates a mapping from a parameter descriptor to its index
+ Map<Descriptor, Integer> mapParamDescToIdx = new HashMap<Descriptor, Integer>();
+ int offset = md.isStatic() ? 0 : 1;
+ for (int i = 0; i < md.numParameters(); i++) {
+ Descriptor paramDesc = (Descriptor) md.getParameter(i);
+ mapParamDescToIdx.put(paramDesc, new Integer(i + offset));
+ }
+
+ FlowGraph fg = new FlowGraph(md, mapParamDescToIdx);
mapMethodDescriptorToFlowGraph.put(md, fg);
+
+ visited.add(md);
analyzeMethodBody(cd, md);
+
}
}
}
_debug_printGraph();
-
}
private void analyzeMethodBody(ClassDescriptor cd, MethodDescriptor md) {
BlockNode bn = state.getMethodBody(md);
- analyzeFlowBlockNode(md, md.getParameterTable(), bn, null);
+ NodeTupleSet implicitFlowTupleSet = new NodeTupleSet();
+ analyzeFlowBlockNode(md, md.getParameterTable(), bn, implicitFlowTupleSet);
}
private void analyzeFlowBlockNode(MethodDescriptor md, SymbolTable nametable, BlockNode bn,
break;
case Kind.ReturnNode:
- analyzeReturnNode(md, nametable, (ReturnNode) bsn);
+ analyzeFlowReturnNode(md, nametable, (ReturnNode) bsn, implicitFlowTupleSet);
break;
case Kind.SubBlockNode:
private void analyzeSwitchStatementNode(MethodDescriptor md, SymbolTable nametable,
SwitchStatementNode bsn) {
// TODO Auto-generated method stub
-
}
private void analyzeFlowSubBlockNode(MethodDescriptor md, SymbolTable nametable,
analyzeFlowBlockNode(md, nametable, sbn.getBlockNode(), implicitFlowTupleSet);
}
- private void analyzeReturnNode(MethodDescriptor md, SymbolTable nametable, ReturnNode bsn) {
- // TODO Auto-generated method stub
+ private void analyzeFlowReturnNode(MethodDescriptor md, SymbolTable nametable, ReturnNode rn,
+ NodeTupleSet implicitFlowTupleSet) {
+
+ ExpressionNode returnExp = rn.getReturnExpression();
+
+ if (returnExp != null) {
+ NodeTupleSet nodeSet = new NodeTupleSet();
+ analyzeFlowExpressionNode(md, nametable, returnExp, nodeSet, false);
+
+ FlowGraph fg = getFlowGraph(md);
+
+ // annotate the elements of the node set as the return location
+ for (Iterator iterator = nodeSet.iterator(); iterator.hasNext();) {
+ NTuple<Descriptor> returnDescTuple = (NTuple<Descriptor>) iterator.next();
+ fg.setReturnFlowNode(returnDescTuple);
+ for (Iterator iterator2 = implicitFlowTupleSet.iterator(); iterator2.hasNext();) {
+ NTuple<Descriptor> implicitFlowDescTuple = (NTuple<Descriptor>) iterator2.next();
+ fg.addValueFlowEdge(implicitFlowDescTuple, returnDescTuple);
+ }
+ }
+ }
}
NodeTupleSet condTupleNode = new NodeTupleSet();
analyzeFlowExpressionNode(md, nametable, ln.getCondition(), condTupleNode, null,
- implicitFlowTupleSet);
+ implicitFlowTupleSet, false);
condTupleNode.addTupleSet(implicitFlowTupleSet);
- System.out.println("condTupleNode=" + condTupleNode);
// add edges from condNodeTupleSet to all nodes of conditional nodes
analyzeFlowBlockNode(md, nametable, ln.getBody(), condTupleNode);
} else {
// check 'for loop' case
BlockNode bn = ln.getInitializer();
- analyzeFlowBlockNode(md, nametable, 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, nametable, ln.getCondition(), condTupleNode, null,
- implicitFlowTupleSet);
+ analyzeFlowExpressionNode(md, bn.getVarTable(), ln.getCondition(), condTupleNode, null,
+ implicitFlowTupleSet, false);
condTupleNode.addTupleSet(implicitFlowTupleSet);
- System.out.println("condTupleNode=" + condTupleNode);
analyzeFlowBlockNode(md, bn.getVarTable(), ln.getUpdate(), condTupleNode);
analyzeFlowBlockNode(md, bn.getVarTable(), ln.getBody(), condTupleNode);
NodeTupleSet condTupleNode = new NodeTupleSet();
analyzeFlowExpressionNode(md, nametable, isn.getCondition(), condTupleNode, null,
- implicitFlowTupleSet);
+ implicitFlowTupleSet, false);
// add edges from condNodeTupleSet to all nodes of conditional nodes
condTupleNode.addTupleSet(implicitFlowTupleSet);
DeclarationNode dn, NodeTupleSet implicitFlowTupleSet) {
VarDescriptor vd = dn.getVarDescriptor();
+ mapDescToDefinitionLine.put(vd, dn.getNumLine());
NTuple<Descriptor> tupleLHS = new NTuple<Descriptor>();
tupleLHS.add(vd);
- getFlowGraph(md).createNewFlowNode(tupleLHS);
+ FlowNode fn = getFlowGraph(md).createNewFlowNode(tupleLHS);
+ fn.setDeclarationNode();
if (dn.getExpression() != null) {
NodeTupleSet tupleSetRHS = new NodeTupleSet();
analyzeFlowExpressionNode(md, nametable, dn.getExpression(), tupleSetRHS, null,
- implicitFlowTupleSet);
+ implicitFlowTupleSet, false);
// add a new flow edge from rhs to lhs
for (Iterator<NTuple<Descriptor>> iter = tupleSetRHS.iterator(); iter.hasNext();) {
private void analyzeBlockExpressionNode(MethodDescriptor md, SymbolTable nametable,
BlockExpressionNode ben, NodeTupleSet implicitFlowTupleSet) {
- analyzeFlowExpressionNode(md, nametable, ben.getExpression(), null, null, implicitFlowTupleSet);
+ analyzeFlowExpressionNode(md, nametable, ben.getExpression(), null, null, implicitFlowTupleSet,
+ false);
+ }
+
+ private NTuple<Descriptor> analyzeFlowExpressionNode(MethodDescriptor md, SymbolTable nametable,
+ ExpressionNode en, NodeTupleSet nodeSet, boolean isLHS) {
+ return analyzeFlowExpressionNode(md, nametable, en, nodeSet, null, new NodeTupleSet(), isLHS);
}
private NTuple<Descriptor> analyzeFlowExpressionNode(MethodDescriptor md, SymbolTable nametable,
ExpressionNode en, NodeTupleSet nodeSet, NTuple<Descriptor> base,
- NodeTupleSet implicitFlowTupleSet) {
+ NodeTupleSet implicitFlowTupleSet, boolean isLHS) {
// note that expression node can create more than one flow node
// nodeSet contains of flow nodes
- // base is always assigned to null except name node case!
+ // base is always assigned to null except the case of a name node!
NTuple<Descriptor> flowTuple;
switch (en.kind()) {
case Kind.AssignmentNode:
- analyzeFlowAssignmentNode(md, nametable, (AssignmentNode) en, base, implicitFlowTupleSet);
+ analyzeFlowAssignmentNode(md, nametable, (AssignmentNode) en, nodeSet, base,
+ implicitFlowTupleSet);
break;
case Kind.FieldAccessNode:
flowTuple =
analyzeFlowFieldAccessNode(md, nametable, (FieldAccessNode) en, nodeSet, base,
- implicitFlowTupleSet);
- nodeSet.addTuple(flowTuple);
+ implicitFlowTupleSet, isLHS);
+ if (flowTuple != null) {
+ nodeSet.addTuple(flowTuple);
+ }
return flowTuple;
case Kind.NameNode:
NodeTupleSet nameNodeSet = new NodeTupleSet();
flowTuple =
analyzeFlowNameNode(md, nametable, (NameNode) en, nameNodeSet, base, implicitFlowTupleSet);
- nodeSet.addTuple(flowTuple);
+ if (flowTuple != null) {
+ nodeSet.addTuple(flowTuple);
+ }
return flowTuple;
case Kind.OpNode:
break;
case Kind.ArrayAccessNode:
- analyzeArrayAccessNode(md, nametable, (ArrayAccessNode) en);
+ analyzeFlowArrayAccessNode(md, nametable, (ArrayAccessNode) en, nodeSet, isLHS);
break;
case Kind.LiteralNode:
break;
case Kind.MethodInvokeNode:
- analyzeMethodInvokeNode(md, nametable, (MethodInvokeNode) en);
+ analyzeFlowMethodInvokeNode(md, nametable, (MethodInvokeNode) en, implicitFlowTupleSet);
break;
case Kind.TertiaryNode:
- analyzeTertiaryNode(md, nametable, (TertiaryNode) en);
+ analyzeFlowTertiaryNode(md, nametable, (TertiaryNode) en, nodeSet, implicitFlowTupleSet);
break;
case Kind.CastNode:
- analyzeCastNode(md, nametable, (CastNode) en);
+ analyzeFlowCastNode(md, nametable, (CastNode) en, nodeSet, base, implicitFlowTupleSet);
break;
-
// case Kind.InstanceOfNode:
// checkInstanceOfNode(md, nametable, (InstanceOfNode) en, td);
// return null;
}
- private void analyzeCastNode(MethodDescriptor md, SymbolTable nametable, CastNode en) {
- // TODO Auto-generated method stub
+ private void analyzeFlowCastNode(MethodDescriptor md, SymbolTable nametable, CastNode cn,
+ NodeTupleSet nodeSet, NTuple<Descriptor> base, NodeTupleSet implicitFlowTupleSet) {
+
+ analyzeFlowExpressionNode(md, nametable, cn.getExpression(), nodeSet, base,
+ implicitFlowTupleSet, false);
}
- private void analyzeTertiaryNode(MethodDescriptor md, SymbolTable nametable, TertiaryNode en) {
- // TODO Auto-generated method stub
+ private void analyzeFlowTertiaryNode(MethodDescriptor md, SymbolTable nametable, TertiaryNode tn,
+ NodeTupleSet nodeSet, NodeTupleSet implicitFlowTupleSet) {
+
+ NodeTupleSet tertiaryTupleNode = new NodeTupleSet();
+ analyzeFlowExpressionNode(md, nametable, tn.getCond(), tertiaryTupleNode, null,
+ implicitFlowTupleSet, false);
+
+ // add edges from tertiaryTupleNode to all nodes of conditional nodes
+ tertiaryTupleNode.addTupleSet(implicitFlowTupleSet);
+ analyzeFlowExpressionNode(md, nametable, tn.getTrueExpr(), tertiaryTupleNode, null,
+ implicitFlowTupleSet, false);
+
+ analyzeFlowExpressionNode(md, nametable, tn.getFalseExpr(), tertiaryTupleNode, null,
+ implicitFlowTupleSet, false);
+
+ nodeSet.addTupleSet(tertiaryTupleNode);
}
- private void analyzeMethodInvokeNode(MethodDescriptor md, SymbolTable nametable,
- MethodInvokeNode en) {
- // TODO Auto-generated method stub
+ private void addMapCallerMethodDescToMethodInvokeNodeSet(MethodDescriptor caller,
+ MethodInvokeNode min) {
+ Set<MethodInvokeNode> set = mapMethodDescriptorToMethodInvokeNodeSet.get(caller);
+ if (set == null) {
+ set = new HashSet<MethodInvokeNode>();
+ mapMethodDescriptorToMethodInvokeNodeSet.put(caller, set);
+ }
+ set.add(min);
+ }
+
+ private void analyzeFlowMethodInvokeNode(MethodDescriptor md, SymbolTable nametable,
+ MethodInvokeNode min, NodeTupleSet implicitFlowTupleSet) {
+
+ addMapCallerMethodDescToMethodInvokeNodeSet(md, min);
+
+ MethodDescriptor calleeMD = min.getMethod();
+
+ NameDescriptor baseName = min.getBaseName();
+ boolean isSystemout = false;
+ if (baseName != null) {
+ isSystemout = baseName.getSymbol().equals("System.out");
+ }
+
+ if (!ssjava.isSSJavaUtil(calleeMD.getClassDesc()) && !ssjava.isTrustMethod(calleeMD)
+ && !calleeMD.getModifiers().isNative() && !isSystemout) {
+
+ // CompositeLocation baseLocation = null;
+ if (min.getExpression() != null) {
+
+ NodeTupleSet baseNodeSet = new NodeTupleSet();
+ analyzeFlowExpressionNode(md, nametable, min.getExpression(), baseNodeSet, null,
+ implicitFlowTupleSet, false);
+
+ } else {
+ if (min.getMethod().isStatic()) {
+ // String globalLocId = ssjava.getMethodLattice(md).getGlobalLoc();
+ // if (globalLocId == null) {
+ // throw new
+ // Error("Method lattice does not define global variable location at "
+ // + generateErrorMessage(md.getClassDesc(), min));
+ // }
+ // baseLocation = new CompositeLocation(new Location(md,
+ // globalLocId));
+ } else {
+ // 'this' var case
+ // String thisLocId = ssjava.getMethodLattice(md).getThisLoc();
+ // baseLocation = new CompositeLocation(new Location(md, thisLocId));
+ }
+ }
+
+ // constraint case:
+ // if (constraint != null) {
+ // int compareResult =
+ // CompositeLattice.compare(constraint, baseLocation, true,
+ // generateErrorMessage(cd, min));
+ // if (compareResult != ComparisonResult.GREATER) {
+ // // if the current constraint is higher than method's THIS location
+ // // no need to check constraints!
+ // CompositeLocation calleeConstraint =
+ // translateCallerLocToCalleeLoc(calleeMD, baseLocation, constraint);
+ // // System.out.println("check method body for constraint:" + calleeMD +
+ // // " calleeConstraint="
+ // // + calleeConstraint);
+ // checkMethodBody(calleeMD.getClassDesc(), calleeMD, calleeConstraint);
+ // }
+ // }
+
+ analyzeFlowMethodParameters(md, nametable, min);
+
+ // checkCalleeConstraints(md, nametable, min, baseLocation, constraint);
+
+ // checkCallerArgumentLocationConstraints(md, nametable, min,
+ // baseLocation, constraint);
+
+ if (min.getMethod().getReturnType() != null && !min.getMethod().getReturnType().isVoid()) {
+ // If method has a return value, compute the highest possible return
+ // location in the caller's perspective
+ // CompositeLocation ceilingLoc =
+ // computeCeilingLocationForCaller(md, nametable, min, baseLocation,
+ // constraint);
+ // return ceilingLoc;
+ }
+ }
+
+ // return new CompositeLocation(Location.createTopLocation(md));
+
+ }
+
+ private NodeTupleSet getNodeTupleSetByArgIdx(MethodInvokeNode min, int idx) {
+ return mapMethodInvokeNodeToArgIdxMap.get(min).get(new Integer(idx));
+ }
+
+ private void addArgIdxMap(MethodInvokeNode min, int idx, NodeTupleSet tupleSet) {
+ Map<Integer, NodeTupleSet> mapIdxToTupleSet = mapMethodInvokeNodeToArgIdxMap.get(min);
+ if (mapIdxToTupleSet == null) {
+ mapIdxToTupleSet = new HashMap<Integer, NodeTupleSet>();
+ mapMethodInvokeNodeToArgIdxMap.put(min, mapIdxToTupleSet);
+ }
+ mapIdxToTupleSet.put(new Integer(idx), tupleSet);
+ }
+
+ private void analyzeFlowMethodParameters(MethodDescriptor callermd, SymbolTable nametable,
+ MethodInvokeNode min) {
+
+ if (min.numArgs() > 0) {
+
+ int offset;
+ if (min.getMethod().isStatic()) {
+ offset = 0;
+ } else {
+ offset = 1;
+ NTuple<Descriptor> thisArgTuple = new NTuple<Descriptor>();
+ thisArgTuple.add(callermd.getThis());
+ NodeTupleSet argTupleSet = new NodeTupleSet();
+ argTupleSet.addTuple(thisArgTuple);
+ addArgIdxMap(min, 0, argTupleSet);
+ }
+
+ for (int i = 0; i < min.numArgs(); i++) {
+ ExpressionNode en = min.getArg(i);
+ NodeTupleSet argTupleSet = new NodeTupleSet();
+ analyzeFlowExpressionNode(callermd, nametable, en, argTupleSet, false);
+ // if argument is liternal node, argTuple is set to NULL.
+ addArgIdxMap(min, i + offset, argTupleSet);
+ }
+
+ }
}
private void analyzeLiteralNode(MethodDescriptor md, SymbolTable nametable, LiteralNode en) {
- // TODO Auto-generated method stub
}
- private void analyzeArrayAccessNode(MethodDescriptor md, SymbolTable nametable, ArrayAccessNode en) {
- // TODO Auto-generated method stub
+ private void analyzeFlowArrayAccessNode(MethodDescriptor md, SymbolTable nametable,
+ ArrayAccessNode aan, NodeTupleSet nodeSet, boolean isLHS) {
+
+ NodeTupleSet expNodeTupleSet = new NodeTupleSet();
+ analyzeFlowExpressionNode(md, nametable, aan.getExpression(), expNodeTupleSet, isLHS);
+
+ NodeTupleSet idxNodeTupleSet = new NodeTupleSet();
+ analyzeFlowExpressionNode(md, nametable, aan.getIndex(), idxNodeTupleSet, isLHS);
+ if (isLHS) {
+ // need to create an edge from idx to array
+ for (Iterator<NTuple<Descriptor>> idxIter = idxNodeTupleSet.iterator(); idxIter.hasNext();) {
+ NTuple<Descriptor> idxTuple = idxIter.next();
+ for (Iterator<NTuple<Descriptor>> arrIter = expNodeTupleSet.iterator(); arrIter.hasNext();) {
+ NTuple<Descriptor> arrTuple = arrIter.next();
+ getFlowGraph(md).addValueFlowEdge(idxTuple, arrTuple);
+ }
+ }
+
+ nodeSet.addTupleSet(expNodeTupleSet);
+ } else {
+ nodeSet.addTupleSet(expNodeTupleSet);
+ nodeSet.addTupleSet(idxNodeTupleSet);
+ }
}
private void analyzeCreateObjectNode(MethodDescriptor md, SymbolTable nametable,
NodeTupleSet rightOpSet = new NodeTupleSet();
// left operand
- analyzeFlowExpressionNode(md, nametable, on.getLeft(), leftOpSet, null, implicitFlowTupleSet);
- System.out.println("leftOpSet=" + leftOpSet);
+ analyzeFlowExpressionNode(md, nametable, on.getLeft(), leftOpSet, null, implicitFlowTupleSet,
+ false);
if (on.getRight() != null) {
// right operand
analyzeFlowExpressionNode(md, nametable, on.getRight(), rightOpSet, null,
- implicitFlowTupleSet);
- System.out.println("rightOpSet=" + rightOpSet);
+ implicitFlowTupleSet, false);
}
Operation op = on.getOp();
default:
throw new Error(op.toString());
}
+
}
private NTuple<Descriptor> analyzeFlowNameNode(MethodDescriptor md, SymbolTable nametable,
}
NameDescriptor nd = nn.getName();
+
if (nd.getBase() != null) {
- analyzeFlowExpressionNode(md, nametable, nn.getExpression(), nodeSet, base,
- implicitFlowTupleSet);
+ base =
+ analyzeFlowExpressionNode(md, nametable, nn.getExpression(), nodeSet, base,
+ implicitFlowTupleSet, false);
+ if (base == null) {
+ // base node has the top location
+ return base;
+ }
} else {
String varname = nd.toString();
if (varname.equals("this")) {
Descriptor d = (Descriptor) nametable.get(varname);
- // CompositeLocation localLoc = null;
if (d instanceof VarDescriptor) {
VarDescriptor vd = (VarDescriptor) d;
- // localLoc = d2loc.get(vd);
- // the type of var descriptor has a composite location!
- // loc = ((SSJavaType)
- // vd.getType().getExtension()).getCompLoc().clone();
base.add(vd);
} else if (d instanceof FieldDescriptor) {
// the type of field descriptor has a location!
FieldDescriptor fd = (FieldDescriptor) d;
if (fd.isStatic()) {
if (fd.isFinal()) {
- // if it is 'static final', the location has TOP since no one can
- // change its value
- // loc.addLocation(Location.createTopLocation(md));
- // return loc;
+ // if it is 'static final', no need to have flow node for the TOP
+ // location
+ return null;
} else {
- // if 'static', the location has pre-assigned global loc
- // MethodLattice<String> localLattice = ssjava.getMethodLattice(md);
- // String globalLocId = localLattice.getGlobalLoc();
- // if (globalLocId == null) {
- // throw new
- // Error("Global location element is not defined in the method " +
- // md);
- // }
- // Location globalLoc = new Location(md, globalLocId);
- //
- // loc.addLocation(globalLoc);
+ // if 'static', assign the default GLOBAL LOCATION to the first
+ // element of the tuple
+ base.add(GLOBALDESC);
}
} else {
// the location of field access starts from this, followed by field
base.add(fd);
} else if (d == null) {
// access static field
+ base.add(GLOBALDESC);
+ // base.add(nn.getField());
+ return base;
+
// FieldDescriptor fd = nn.getField();addFlowGraphEdge
//
// MethodLattice<String> localLattice = ssjava.getMethodLattice(md);
private NTuple<Descriptor> analyzeFlowFieldAccessNode(MethodDescriptor md, SymbolTable nametable,
FieldAccessNode fan, NodeTupleSet nodeSet, NTuple<Descriptor> base,
- NodeTupleSet implicitFlowTupleSet) {
+ NodeTupleSet implicitFlowTupleSet, boolean isLHS) {
ExpressionNode left = fan.getExpression();
TypeDescriptor ltd = left.getType();
if (ltd.isClassNameRef() || (varName != null && varName.equals("this"))) {
// using a class name directly or access using this
if (fd.isStatic() && fd.isFinal()) {
- // loc.addLocation(Location.createTopLocation(md));
- // return loc;
+ return null;
}
}
- // if (left instanceof ArrayAccessNode) {
- // ArrayAccessNode aan = (ArrayAccessNode) left;
- // left = aan.getExpression();
- // }
- // fanNodeSet
- base = analyzeFlowExpressionNode(md, nametable, left, nodeSet, base, implicitFlowTupleSet);
+ NodeTupleSet idxNodeTupleSet = new NodeTupleSet();
+ if (left instanceof ArrayAccessNode) {
- if (!left.getType().isPrimitive()) {
+ ArrayAccessNode aan = (ArrayAccessNode) left;
+ left = aan.getExpression();
+ analyzeFlowExpressionNode(md, nametable, aan.getIndex(), idxNodeTupleSet, base,
+ implicitFlowTupleSet, isLHS);
+ nodeSet.addTupleSet(idxNodeTupleSet);
+ }
+ base =
+ analyzeFlowExpressionNode(md, nametable, left, nodeSet, base, implicitFlowTupleSet, isLHS);
- if (fd.getSymbol().equals("length")) {
- // TODO
- // array.length access, return the location of the array
- // return loc;
+ if (base == null) {
+ // in this case, field is TOP location
+ return null;
+ } else {
+
+ NTuple<Descriptor> flowFieldTuple = new NTuple<Descriptor>(base.toList());
+
+ if (!left.getType().isPrimitive()) {
+
+ if (!fd.getSymbol().equals("length")) {
+ // array.length access, just have the location of the array
+ flowFieldTuple.add(fd);
+ nodeSet.removeTuple(base);
+ }
+
+ }
+ getFlowGraph(md).createNewFlowNode(flowFieldTuple);
+
+ if (isLHS) {
+ for (Iterator<NTuple<Descriptor>> idxIter = idxNodeTupleSet.iterator(); idxIter.hasNext();) {
+ NTuple<Descriptor> idxTuple = idxIter.next();
+ getFlowGraph(md).addValueFlowEdge(idxTuple, flowFieldTuple);
+ }
}
- base.add(fd);
+ return flowFieldTuple;
+
}
- return base;
+ }
+
+ private void debug_printTreeNode(TreeNode tn) {
+
+ System.out.println("DEBUG: " + tn.printNode(0) + " line#=" + tn.getNumLine());
}
private void analyzeFlowAssignmentNode(MethodDescriptor md, SymbolTable nametable,
- AssignmentNode an, NTuple<Descriptor> base, NodeTupleSet implicitFlowTupleSet) {
-
- System.out.println("analyzeFlowAssignmentNode=" + an);
+ AssignmentNode an, NodeTupleSet nodeSet, NTuple<Descriptor> base,
+ NodeTupleSet implicitFlowTupleSet) {
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);
- System.out.println("ASSIGNMENT NODE nodeSetLHS=" + nodeSetLHS);
- // NTuple<Descriptor> lhsDescTuple = analyzeFlowExpressionNode(md,
- // nametable, an.getDest(), base);
+ analyzeFlowExpressionNode(md, nametable, an.getDest(), nodeSetLHS, null, implicitFlowTupleSet,
+ true);
if (!postinc) {
// analyze value flows of rhs expression
- analyzeFlowExpressionNode(md, nametable, an.getSrc(), nodeSetRHS, null, implicitFlowTupleSet);
- System.out.println("ASSIGNMENT NODE nodeSetRHS=" + nodeSetRHS);
+ analyzeFlowExpressionNode(md, nametable, an.getSrc(), nodeSetRHS, null, implicitFlowTupleSet,
+ false);
+
+ // System.out.println("-analyzeFlowAssignmentNode=" + an.printNode(0));
+ // System.out.println("-nodeSetLHS=" + nodeSetLHS);
+ // System.out.println("-nodeSetRHS=" + nodeSetRHS);
+ // System.out.println("-implicitFlowTupleSet=" + implicitFlowTupleSet);
+ // System.out.println("-");
+
+ if (an.getOperation().getOp() >= 2 && an.getOperation().getOp() <= 12) {
+ // if assignment contains OP+EQ operator, creates edges from LHS to LHS
+ for (Iterator<NTuple<Descriptor>> iter = nodeSetLHS.iterator(); iter.hasNext();) {
+ NTuple<Descriptor> fromTuple = iter.next();
+ for (Iterator<NTuple<Descriptor>> iter2 = nodeSetLHS.iterator(); iter2.hasNext();) {
+ NTuple<Descriptor> toTuple = iter2.next();
+ addFlowGraphEdge(md, fromTuple, toTuple);
+ }
+ }
+ }
// creates edges from RHS to LHS
for (Iterator<NTuple<Descriptor>> iter = nodeSetRHS.iterator(); iter.hasNext();) {
addFlowGraphEdge(md, tuple, tuple);
}
+ // creates edges from implicitFlowTupleSet to LHS
+ for (Iterator<NTuple<Descriptor>> iter = implicitFlowTupleSet.iterator(); iter.hasNext();) {
+ NTuple<Descriptor> fromTuple = iter.next();
+ for (Iterator<NTuple<Descriptor>> iter2 = nodeSetLHS.iterator(); iter2.hasNext();) {
+ NTuple<Descriptor> toTuple = iter2.next();
+ addFlowGraphEdge(md, fromTuple, toTuple);
+ }
+ }
+
}
+ if (nodeSet != null) {
+ nodeSet.addTupleSet(nodeSetLHS);
+ }
}
public FlowGraph getFlowGraph(MethodDescriptor md) {
return mapMethodDescriptorToFlowGraph.get(md);
}
- public void addFlowGraphEdge(MethodDescriptor md, NTuple<Descriptor> from, NTuple<Descriptor> to) {
+ private boolean addFlowGraphEdge(MethodDescriptor md, NTuple<Descriptor> from,
+ NTuple<Descriptor> to) {
+ // TODO
+ // return true if it adds a new edge
FlowGraph graph = getFlowGraph(md);
graph.addValueFlowEdge(from, to);
+ return true;
}
public void _debug_printGraph() {
}
}
+
+class CyclicFlowException extends Exception {
+
+}
projects / IRC.git / blobdiff