+}
+
+void OrderGraph::DFSReverse(Vector<OrderNode *> *finishNodes) {
+ uint size = finishNodes->getSize();
+ uint sccNum = 1;
+ for (int i = size - 1; i >= 0; i--) {
+ OrderNode *node = finishNodes->get(i);
+ if (node->status == NOTVISITED) {
+ node->status = VISITED;
+ DFSNodeVisit(node, NULL, true, false, sccNum);
+ node->sccNum = sccNum;
+ node->status = FINISHED;
+ sccNum++;
+ }
+ }
+}
+
+void OrderGraph::DFSNodeVisit(OrderNode *node, Vector<OrderNode *> *finishNodes, bool isReverse, bool mustvisit, uint sccNum) {
+ SetIteratorOrderEdge *iterator = isReverse ? node->inEdges.iterator() : node->outEdges.iterator();
+ while (iterator->hasNext()) {
+ OrderEdge *edge = iterator->next();
+ if (mustvisit) {
+ if (!edge->mustPos)
+ continue;
+ } else
+ if (!edge->polPos && !edge->pseudoPos) //Ignore edges that do not have positive polarity
+ continue;
+
+ OrderNode *child = isReverse ? edge->source : edge->sink;
+ if (child->status == NOTVISITED) {
+ child->status = VISITED;
+ DFSNodeVisit(child, finishNodes, isReverse, mustvisit, sccNum);
+ child->status = FINISHED;
+ if (finishNodes != NULL) {
+ finishNodes->push(child);
+ }
+ if (isReverse)
+ child->sccNum = sccNum;
+ }
+ }
+ delete iterator;
+}
+
+void OrderGraph::resetNodeInfoStatusSCC() {
+ SetIteratorOrderNode *iterator = getNodes();
+ while (iterator->hasNext()) {
+ ((OrderNode *)iterator->next())->status = NOTVISITED;
+ }
+ delete iterator;
+}
+
+void OrderGraph::computeStronglyConnectedComponentGraph() {
+ Vector<OrderNode *> finishNodes;
+ DFS(&finishNodes);
+ resetNodeInfoStatusSCC();
+ DFSReverse(&finishNodes);
+ resetNodeInfoStatusSCC();
+}
+
+/** This function computes a source set for every nodes, the set of
+ nodes that can reach that node via pospolarity edges. It then
+ looks for negative polarity edges from nodes in the the source set
+ to determine whether we need to generate pseudoPos edges. */
+
+void OrderGraph::completePartialOrderGraph() {
+ Vector<OrderNode *> finishNodes;
+ DFS(&finishNodes);
+ resetNodeInfoStatusSCC();
+ HashtableNodeToNodeSet *table = new HashtableNodeToNodeSet(128, 0.25);
+
+ Vector<OrderNode *> sccNodes;
+
+ uint size = finishNodes.getSize();
+ uint sccNum = 1;
+ for (int i = size - 1; i >= 0; i--) {
+ OrderNode *node = finishNodes.get(i);
+ HashsetOrderNode *sources = new HashsetOrderNode(4, 0.25);
+ table->put(node, sources);
+
+ if (node->status == NOTVISITED) {
+ //Need to do reverse traversal here...
+ node->status = VISITED;
+ DFSNodeVisit(node, &sccNodes, true, false, sccNum);
+ node->status = FINISHED;
+ node->sccNum = sccNum;
+ sccNum++;
+ sccNodes.push(node);
+
+ //Compute in set for entire SCC
+ uint rSize = sccNodes.getSize();
+ for (uint j = 0; j < rSize; j++) {
+ OrderNode *rnode = sccNodes.get(j);
+ //Compute source sets
+ SetIteratorOrderEdge *iterator = rnode->inEdges.iterator();
+ while (iterator->hasNext()) {
+ OrderEdge *edge = iterator->next();
+ OrderNode *parent = edge->source;
+ if (edge->polPos) {
+ sources->add(parent);
+ HashsetOrderNode *parent_srcs = (HashsetOrderNode *)table->get(parent);
+ sources->addAll(parent_srcs);
+ }
+ }
+ delete iterator;
+ }
+ for (uint j = 0; j < rSize; j++) {
+ //Copy in set of entire SCC
+ OrderNode *rnode = sccNodes.get(j);
+ HashsetOrderNode *set = (j == 0) ? sources : sources->copy();
+ table->put(rnode, set);
+
+ //Use source sets to compute pseudoPos edges
+ SetIteratorOrderEdge *iterator = node->inEdges.iterator();
+ while (iterator->hasNext()) {
+ OrderEdge *edge = iterator->next();
+ OrderNode *parent = edge->source;
+ ASSERT(parent != rnode);
+ if (edge->polNeg && parent->sccNum != rnode->sccNum &&
+ sources->contains(parent)) {
+ OrderEdge *newedge = getOrderEdgeFromOrderGraph(rnode, parent);
+ newedge->pseudoPos = true;
+ }
+ }
+ delete iterator;
+ }
+
+ sccNodes.clear();
+ }
+ }
+
+ table->resetAndDeleteVals();
+ delete table;
+ resetNodeInfoStatusSCC();