X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=cyclegraph.h;h=749abf8ca847d9969016356101b153c4d0688a84;hb=00b14c0561d3838aeb798d3c22f4136f8c4d136b;hp=9fc789c1913edd590f59c497f6cee1ff0b59eff2;hpb=096afcb50341ae3e0b8fccb4ee06881086bc0953;p=model-checker.git

diff --git a/cyclegraph.h b/cyclegraph.h
index 9fc789c..749abf8 100644
--- a/cyclegraph.h
+++ b/cyclegraph.h
@@ -28,7 +28,7 @@ class CycleGraph {
 	~CycleGraph();
 
 	template <typename T, typename U>
-	void addEdge(const T from, const U to);
+	bool addEdge(const T from, const U to);
 
 	bool checkForCycles() const;
 	void addRMWEdge(const ModelAction *from, const ModelAction *rmw);
@@ -50,7 +50,7 @@ class CycleGraph {
 
 	SNAPSHOTALLOC
  private:
-	void addNodeEdge(CycleNode *fromnode, CycleNode *tonode);
+	bool addNodeEdge(CycleNode *fromnode, CycleNode *tonode);
 	void putNode(const ModelAction *act, CycleNode *node);
 	CycleNode * getNode(const ModelAction *act);
 	CycleNode * getNode(const Promise *promise);
@@ -141,9 +141,10 @@ class CycleNode {
  *
  * @param to The edge points to this object, of type T
  * @param from The edge comes from this object, of type U
+ * @return True, if new edge(s) are added; otherwise false
  */
 template <typename T, typename U>
-void CycleGraph::addEdge(const T from, const U to)
+bool CycleGraph::addEdge(const T from, const U to)
 {
 	ASSERT(from);
 	ASSERT(to);
@@ -151,7 +152,25 @@ void CycleGraph::addEdge(const T from, const U to)
 	CycleNode *fromnode = getNode(from);
 	CycleNode *tonode = getNode(to);
 
-	addNodeEdge(fromnode, tonode);
+	return addNodeEdge(fromnode, tonode);
+}
+
+/**
+ * Checks whether one ModelAction can reach another ModelAction/Promise
+ * @param from The ModelAction from which to begin exploration
+ * @param to The ModelAction or Promise to reach
+ * @return True, @a from can reach @a to; otherwise, false
+ */
+template <typename T>
+bool CycleGraph::checkReachable(const ModelAction *from, const T *to) const
+{
+	CycleNode *fromnode = getNode_noCreate(from);
+	CycleNode *tonode = getNode_noCreate(to);
+
+	if (!fromnode || !tonode)
+		return false;
+
+	return checkReachable(fromnode, tonode);
 }
 
 #endif /* __CYCLEGRAPH_H__ */