private final PrintWriter out;
private final HashSet<String> conflictSet = new HashSet<String>(); // Variables we want to track
private final HashSet<String> appSet = new HashSet<String>(); // Apps we want to find their conflicts
+ private final HashSet<String> manualSet = new HashSet<String>(); // Writer classes with manual inputs to detect direct-direct(No Conflict) interactions
private final HashMap<Integer, Node> nodes = new HashMap<Integer, Node>(); // Nodes of a graph
- private final DataSet tempSetSet = new DataSet(false, "NA", false, "NA");
- volatile private Node parentNode = new Node(-2);
- volatile private String operation;
- volatile private String detail;
- volatile private int depth;
- volatile private int id;
- volatile private boolean conflictFound = false;
- volatile private boolean isSet = false;
- Transition transition;
- Object annotation;
- String label;
+ private HashSet<NameValuePair> tempSetSet = new HashSet<NameValuePair>();
+ private long timeout;
+ private long startTime;
+ private Node parentNode = new Node(-2);
+ private String operation;
+ private String detail;
+ private String errorMessage;
+ private int depth;
+ private int id;
+ private boolean conflictFound = false;
+ private boolean isSet = false;
+ private boolean manual = false;
- public ConflictTracker(Config conf, JPF jpf) {
+ public ConflictTracker(Config config, JPF jpf) {
out = new PrintWriter(System.out, true);
- String[] conflictVars = conf.getStringArray("variables");
+ String[] conflictVars = config.getStringArray("variables");
// We are not tracking anything if it is null
if (conflictVars != null) {
for (String var : conflictVars) {
conflictSet.add(var);
}
}
- String[] apps = conf.getStringArray("apps");
+ String[] apps = config.getStringArray("apps");
// We are not tracking anything if it is null
if (apps != null) {
for (String var : apps) {
appSet.add(var);
}
}
+ String[] manualClasses = config.getStringArray("manualClasses");
+ // We are not tracking anything if it is null
+ if (manualClasses != null) {
+ for (String var : manualClasses) {
+ manualSet.add(var);
+ }
+ }
+
+ // Timeout input from config is in minutes, so we need to convert into millis
+ timeout = config.getInt("timeout", 0) * 60 * 1000;
+ startTime = System.currentTimeMillis();
+ }
+
+ boolean propagateTheChange(Node currentNode) {
+ HashSet<Node> changed = new HashSet<Node>(currentNode.getSuccessors());
+
+ while(!changed.isEmpty()) {
+ // Get the first element of HashSet and remove it from the changed set
+ Node nodeToProcess = changed.iterator().next();
+ changed.remove(nodeToProcess);
+
+ // Update the sets, store the outSet to temp before its changes
+ boolean isChanged = updateSets(nodeToProcess);
+
+ // Check for a conflict
+ if (checkForConflict(nodeToProcess))
+ return true;
+
+ // Checking if the out set has changed or not(Add its successors to the change list!)
+ if (isChanged) {
+ for (Node i : nodeToProcess.getSuccessors()) {
+ if (!changed.contains(i))
+ changed.add(i);
+ }
+ }
+ }
+
+ return false;
}
- public void setOutSet(Node currentNode) {
- DataList inSetApp1List = currentNode.getInSet().getApp1DataList(); //Store the app1List of inSet of current node to temp data set
- DataList inSetApp2List = currentNode.getInSet().getApp2DataList(); //Store the app2List of inSet of current node to temp data set
- DataList setSetApp1List = currentNode.getSetSet().getApp1DataList(); //Store the app1List of setSet of current node to temp data set
- DataList setSetApp2List = currentNode.getSetSet().getApp2DataList(); //Store the app2List of setSet of current node to temp data set
- DataSet outSetTemp = currentNode.getOutSet(); //Store the outSet of current node to temp data set
-
- if ((setSetApp1List.getAppSet())&&(setSetApp2List.getAppSet())) {
- //App1 & App2 are writers
- outSetTemp.setApp1DataList(setSetApp1List.getAppSet(), setSetApp1List.getValue());
- outSetTemp.setApp2DataList(setSetApp2List.getAppSet(), setSetApp2List.getValue());
- } else if (setSetApp2List.getAppSet()) {
- //App1 is a writer
- outSetTemp.setApp1DataList(setSetApp1List.getAppSet(), setSetApp1List.getValue());
- outSetTemp.setApp2DataList(inSetApp2List.getAppSet(), inSetApp2List.getValue());
- } else if (setSetApp2List.getAppSet()) {
- //App2 is a writer
- outSetTemp.setApp1DataList(inSetApp1List.getAppSet(),inSetApp1List.getValue());
- outSetTemp.setApp2DataList(setSetApp2List.getAppSet(), setSetApp2List.getValue());
- } else {
- //No writer for this node => outSet = inSet
- outSetTemp.setApp1DataList(inSetApp1List.getAppSet(), inSetApp1List.getValue());
- outSetTemp.setApp2DataList(inSetApp2List.getAppSet(), inSetApp2List.getValue());
+ boolean setOutSet(Node currentNode) {
+ Integer prevSize = currentNode.getOutSet().size();
+
+ // Update based on setSet
+ for (NameValuePair i : currentNode.getSetSet()) {
+ if (currentNode.getOutSet().contains(i))
+ currentNode.getOutSet().remove(i);
+ currentNode.getOutSet().add(i);
}
+
+ // Add all the inSet
+ currentNode.getOutSet().addAll(currentNode.getInSet());
+
+ // Check if the outSet is changed
+ if (!prevSize.equals(currentNode.getOutSet().size()))
+ return true;
+
+ return false;
}
- public void setInSet(Node currentNode) {
+ void setInSet(Node currentNode) {
for (Node i : currentNode.getPredecessors()) {
- //Check to see if dataList1 of predNode(i) is valid or not: if valid get its value
- if (i.getOutSet().getApp1DataList().getAppSet()) {
- currentNode.getInSet().setApp1DataList(true, i.getOutSet().getApp1DataList().getValue());
- }
-
- //Check to see if dataList2 of predNode(i) is valid or not: if valid get its value
- if (i.getOutSet().getApp2DataList().getAppSet()) {
- currentNode.getInSet().setApp2DataList(true, i.getOutSet().getApp2DataList().getValue());
- }
+ currentNode.getInSet().addAll(i.getOutSet());
}
}
- boolean checkOutSetChange(Node currentNode, DataSet tempOutSet) {
- DataList outSetApp1List = currentNode.getOutSet().getApp1DataList(); //Store the app1List of inSet of current node to temp data set
- DataList outSetApp2List = currentNode.getOutSet().getApp2DataList(); //Store the app2List of inSet of current node to temp data set
- DataList tempSetApp1List = tempOutSet.getApp1DataList(); //Store the app1List of tempOutSet of current node to temp data set
- DataList tempSetApp2List = tempOutSet.getApp2DataList(); //Store the app1List of tempOutSet of current node to temp data set
-
- //Return 1 if the outSet has changed!
- return ((outSetApp1List.getAppSet() != tempSetApp1List.getAppSet())||
- !(outSetApp1List.getValue().equals(tempSetApp1List.getValue()))||
- (outSetApp2List.getAppSet() != tempSetApp2List.getAppSet())||
- !(outSetApp2List.getValue().equals(tempSetApp2List.getValue())));
- }
+ boolean checkForConflict(Node currentNode) {
+ HashMap<String, String> valueMap = new HashMap<String, String>(); // HashMap from varName to value
+ HashMap<String, Integer> writerMap = new HashMap<String, Integer>(); // HashMap from varName to appNum
- public void checkForConflict(Node currentNode) {
- DataList outSetApp1List = currentNode.getOutSet().getApp1DataList(); //Store the app1List of inSet of current node to temp data set
- DataList outSetApp2List = currentNode.getOutSet().getApp2DataList(); //Store the app2List of inSet of current node to temp data set
+ for (NameValuePair i : currentNode.getSetSet()) {
+ if (i.getIsManual()) // Manual input: we have no conflict
+ continue;
- if ((outSetApp1List.getAppSet() == true)&&(outSetApp2List.getAppSet() == true)) {
- //Both apps have set the device
- if (!(outSetApp1List.getValue().equals(outSetApp2List.getValue()))) {
- //Values set by the apps are not the same, and we have a conflict!
- conflictFound = true;
+ valueMap.put(i.getVarName(), i.getValue());
+ if (writerMap.containsKey(i.getVarName()))
+ writerMap.put(i.getVarName(), i.getAppNum()+writerMap.get(i.getVarName())); // We have two writers?
+ else
+ writerMap.put(i.getVarName(), i.getAppNum());
+ }
+
+ // Comparing the inSet and setSet to find the conflict
+ for (NameValuePair i : currentNode.getInSet()) {
+ if (valueMap.containsKey(i.getVarName())) {
+ if (!(valueMap.get(i.getVarName()).equals(i.getValue()))) // We have different values
+ if (!(writerMap.get(i.getVarName()).equals(i.getAppNum()))) {// We have different writers
+ errorMessage = "Conflict found between the two apps. App"+i.getAppNum()+" has written the value: "+i.getValue()+
+ " to the variable: "+i.getVarName()+" while App"+writerMap.get(i.getVarName())+" is overwriting the value: "
+ +valueMap.get(i.getVarName())+" to the same variable!";
+ return true;
+ }
}
}
+
+ return false;
}
- class Node {
+ boolean updateSets(Node currentNode) {
+ // Set input set according to output set of pred states of current state
+ setInSet(currentNode);
+
+ // Set outSet according to inSet, and setSet of current node, check if there is a change
+ return setOutSet(currentNode);
+ }
+
+ static class Node {
Integer id;
- ArrayList<Node> predecessors = new ArrayList<Node>();
- ArrayList<Node> successors = new ArrayList<Node>();
- DataSet inSet = new DataSet(false, "NA", false, "NA");
- DataSet setSet = new DataSet(false, "NA", false, "NA");
- DataSet outSet = new DataSet(false, "NA", false, "NA");
+ HashSet<Node> predecessors = new HashSet<Node>();
+ HashSet<Node> successors = new HashSet<Node>();
+ HashSet<NameValuePair> inSet = new HashSet<NameValuePair>();
+ HashSet<NameValuePair> setSet = new HashSet<NameValuePair>();
+ HashSet<NameValuePair> outSet = new HashSet<NameValuePair>();
Node(Integer id) {
this.id = id;
successors.add(node);
}
- void emptyInSet() {
- this.inSet = new DataSet(false, "NA", false, "NA");
- }
-
- void setInSet(DataSet inSet) {
- this.inSet.setApp1DataList(inSet.getApp1DataList().getAppSet(), inSet.getApp1DataList().getValue());
- this.inSet.setApp2DataList(inSet.getApp2DataList().getAppSet(), inSet.getApp2DataList().getValue());
- }
-
- void setSetSet(DataSet setSet) {
- this.setSet.setApp1DataList(setSet.getApp1DataList().getAppSet(), setSet.getApp1DataList().getValue());
- this.setSet.setApp2DataList(setSet.getApp2DataList().getAppSet(), setSet.getApp2DataList().getValue());
- }
-
- void setOutSet(DataSet outSet) {
- this.outSet.setApp1DataList(outSet.getApp1DataList().getAppSet(), outSet.getApp1DataList().getValue());
- this.outSet.setApp2DataList(outSet.getApp2DataList().getAppSet(), outSet.getApp2DataList().getValue());
+ void setSetSet(HashSet<NameValuePair> setSet, boolean isManual) {
+ if (isManual)
+ this.setSet = new HashSet<NameValuePair>();
+ for (NameValuePair i : setSet) {
+ this.setSet.add(new NameValuePair(i.getAppNum(), i.getValue(), i.getVarName(), i.getIsManual()));
+ }
}
Integer getId() {
return id;
}
- ArrayList<Node> getPredecessors() {
+ HashSet<Node> getPredecessors() {
return predecessors;
}
- ArrayList<Node> getSuccessors() {
+ HashSet<Node> getSuccessors() {
return successors;
}
- DataSet getInSet() {
+ HashSet<NameValuePair> getInSet() {
return inSet;
}
- DataSet getOutSet() {
- return outSet;
+ HashSet<NameValuePair> getSetSet() {
+ return setSet;
}
- DataSet getSetSet() {
- return setSet;
+ HashSet<NameValuePair> getOutSet() {
+ return outSet;
}
}
- class DataList {
- boolean appSet;
+ static class NameValuePair {
+ Integer appNum;
String value;
+ String varName;
+ boolean isManual;
- DataList(boolean appSet, String value) {
- this.appSet = appSet;
+ NameValuePair(Integer appNum, String value, String varName, boolean isManual) {
+ this.appNum = appNum;
this.value = value;
+ this.varName = varName;
+ this.isManual = isManual;
}
- void setAppSet(boolean appSet) {
- this.appSet = appSet;
+ void setAppNum(Integer appNum) {
+ this.appNum = appNum;
}
void setValue(String value) {
this.value = value;
}
- boolean getAppSet() {
- return appSet;
+ void setVarName(String varName) {
+ this.varName = varName;
}
- String getValue() {
- return value;
+ void setIsManual(String varName) {
+ this.isManual = isManual;
}
- }
- class DataSet {
- DataList app1DataList = new DataList(false, "NA");
- DataList app2DataList = new DataList(false, "NA");
+ Integer getAppNum() {
+ return appNum;
+ }
- DataSet(boolean app1Set, String app1Value, boolean app2Set, String app2Value) {
- app1DataList.setAppSet(app1Set);
- app1DataList.setValue(app1Value);
- app2DataList.setAppSet(app2Set);
- app2DataList.setValue(app2Value);
+ String getValue() {
+ return value;
}
- void setApp1DataList(boolean appSet, String value) {
- app1DataList.setAppSet(appSet);
- app1DataList.setValue(value);
+ String getVarName() {
+ return varName;
}
- void setApp2DataList(boolean appSet, String value) {
- app2DataList.setAppSet(appSet);
- app2DataList.setValue(value);
+ boolean getIsManual() {
+ return isManual;
}
- DataList getApp1DataList() {
- return app1DataList;
+ @Override
+ public boolean equals(Object o) {
+ if (o instanceof NameValuePair) {
+ NameValuePair other = (NameValuePair) o;
+ if (varName.equals(other.getVarName()))
+ return appNum.equals(other.getAppNum());
+ }
+ return false;
}
- DataList getApp2DataList() {
- return app2DataList;
+ @Override
+ public int hashCode() {
+ return appNum.hashCode() * 31 + varName.hashCode();
}
}
out.println("The state is restored to state with id: "+id+", depth: "+depth);
- //Update the parent node
- parentNode = new Node(id);
+ // Update the parent node
+ if (nodes.containsKey(id)) {
+ parentNode = nodes.get(id);
+ } else {
+ parentNode = new Node(id);
+ }
}
@Override
depth = search.getDepth();
operation = "forward";
- //Add the node to the list of nodes
+ // Add the node to the list of nodes
nodes.put(id, new Node(id));
- Node currentNode = nodes.get(id);
+ Node currentNode = nodes.get(id);
+
+ // Update the setSet for this new node
+ if (isSet) {
+ currentNode.setSetSet(tempSetSet, manual);
+ tempSetSet = new HashSet<NameValuePair>();
+ isSet = false;
+ manual = false;
+ }
if (search.isNewState()) {
- //Add this new node
detail = "new";
- //Update the setSet for this new node
- if (isSet) {
- currentNode.setSetSet(tempSetSet);
- isSet = false;
- }
} else {
detail = "visited";
}
out.println("The state is forwarded to state with id: "+id+", depth: "+depth+" which is "+detail+" state: "+"% "+theEnd);
- //Updating the predecessors for this node
- //Check if parent node is already in successors of the current node or not
+ // Updating the predecessors for this node
+ // Check if parent node is already in successors of the current node or not
if (!(currentNode.getPredecessors().contains(parentNode)))
currentNode.addPredecessor(parentNode);
- //Update the successors for this node
- //Check if current node is already in successors of the parent node or not
+ // Update the successors for this node
+ // Check if current node is already in successors of the parent node or not
if (!(parentNode.getSuccessors().contains(currentNode)))
parentNode.addSuccessor(currentNode);
-
-
- //Set the input set of this state to empty
- currentNode.emptyInSet();
-
-
- //Store the out set of this state to the temporary data set
- DataSet tempOutSet = new DataSet(currentNode.getOutSet().getApp1DataList().getAppSet(),
- currentNode.getOutSet().getApp1DataList().getValue(),
- currentNode.getOutSet().getApp2DataList().getAppSet(),
- currentNode.getOutSet().getApp2DataList().getValue());
-
-
- //Set input set according to output set of pred states of current state
- setInSet(currentNode);
-
-
-
- //Set dataLists of outSet to dataLists of setSet if it is valid, otherwise to dataLists of inSet
- setOutSet(currentNode);
-
-
- //Check for a conflict
- checkForConflict(currentNode);
-
-
-
- //Check if the outSet of this state has changed, update all of its successors' sets if any
- if (checkOutSetChange(currentNode, tempOutSet)) {
- ArrayList<Node> changed = new ArrayList<Node>(currentNode.getSuccessors());
- while(!changed.isEmpty()) {
- //Get a random node inside the changed list and remove it from the list
- Integer rnd = new Random().nextInt(changed.size());
- Node nodeToProcess = changed.get(rnd);
- changed.remove(nodeToProcess);
- //Initialize the empty input set for current node
- nodeToProcess.emptyInSet();
+ // Update the sets, check if the outSet is changed or not
+ boolean isChanged = updateSets(currentNode);
+
+ // Check for a conflict
+ conflictFound = checkForConflict(currentNode);
- //Store the out set of this state to the temporary data set
- tempOutSet = new DataSet(nodeToProcess.getOutSet().getApp1DataList().getAppSet(),
- nodeToProcess.getOutSet().getApp1DataList().getValue(),
- nodeToProcess.getOutSet().getApp2DataList().getAppSet(),
- nodeToProcess.getOutSet().getApp2DataList().getValue());
+ // Check if the outSet of this state has changed, update all of its successors' sets if any
+ if (isChanged)
+ conflictFound = conflictFound || propagateTheChange(currentNode);
-
- //Set input set according to output set of pred states of current state
- setInSet(nodeToProcess);
-
-
- //Set outSet to setSet if it is valid, otherwise to inSet
- setOutSet(nodeToProcess);
-
-
- //Checking if the out set has changed or not(Add its successors to the change list!)
- if (checkOutSetChange(nodeToProcess, tempOutSet)) {
- for (Node i : nodeToProcess.getSuccessors()) {
- if (!changed.contains(i))
- changed.add(i);
- }
- }
- }
+ // Update the parent node
+ if (nodes.containsKey(id)) {
+ parentNode = nodes.get(id);
+ } else {
+ parentNode = new Node(id);
}
-
- //Update the parent node
- parentNode = new Node(id);
-
}
@Override
out.println("The state is backtracked to state with id: "+id+", depth: "+depth);
- //Update the parent node
- parentNode = new Node(id);
+ // Update the parent node
+ if (nodes.containsKey(id)) {
+ parentNode = nodes.get(id);
+ } else {
+ parentNode = new Node(id);
+ }
}
@Override
// Find the variable writer
// It should be one of the apps listed in the .jpf file
- private String getWriter(List<StackFrame> sfList) {
+ private String getWriter(List<StackFrame> sfList, HashSet<String> writerSet) {
// Start looking from the top of the stack backward
for(int i=sfList.size()-1; i>=0; i--) {
MethodInfo mi = sfList.get(i).getMethodInfo();
if(!mi.isJPFInternal()) {
String method = mi.getStackTraceName();
- // Check against the apps in the appSet
- for(String app : appSet) {
- // There is only one writer at a time but we need to always
- // check all the potential writers in the list
- if (method.contains(app)) {
- return app;
+ // Check against the writers in the writerSet
+ for(String writer : writerSet) {
+ if (method.contains(writer)) {
+ return writer;
}
}
}
@Override
public void instructionExecuted(VM vm, ThreadInfo ti, Instruction nextInsn, Instruction executedInsn) {
+ // Instantiate timeoutTimer
+ if (timeout > 0) {
+ if (System.currentTimeMillis() - startTime > timeout) {
+ StringBuilder sbTimeOut = new StringBuilder();
+ sbTimeOut.append("Execution timeout: " + (timeout / (60 * 1000)) + " minutes have passed!");
+ Instruction nextIns = ti.createAndThrowException("java.lang.RuntimeException", sbTimeOut.toString());
+ ti.setNextPC(nextIns);
+ }
+ }
+
if (conflictFound) {
StringBuilder sb = new StringBuilder();
- sb.append("Conflict found between two apps!");
+ sb.append(errorMessage);
Instruction nextIns = ti.createAndThrowException("java.lang.RuntimeException", sb.toString());
ti.setNextPC(nextIns);
} else if (executedInsn instanceof WriteInstruction) {
// Get variable info
byte type = getType(ti, executedInsn);
String value = getValue(ti, executedInsn, type);
- String writer = getWriter(ti.getStack());
+ String writer = getWriter(ti.getStack(), appSet);
// Just return if the writer is not one of the listed apps in the .jpf file
if (writer == null)
return;
- //Update the temporary Set set.
- if (writer.equals("App1"))
- tempSetSet.setApp1DataList(true, value);
- else if (writer.equals("App2"))
- tempSetSet.setApp2DataList(true, value);
- //Set isSet to 1
- isSet = true;
+ if (getWriter(ti.getStack(), manualSet) != null)
+ manual = true;
+
+ // Update the temporary Set set.
+ if (writer.equals("App1"))
+ tempSetSet.add(new NameValuePair(1, value, var, manual));
+ else if (writer.equals("App2"))
+ tempSetSet.add(new NameValuePair(2, value, var, manual));
+ // Set isSet to true
+ isSet = true;
}
- }
+ }
- }
-
}
+
+ }
}
projects / jpf-core.git / blobdiff