#include "cyclegraph.h"
#include "action.h"
+#include "common.h"
+#include "promise.h"
+#include "model.h"
/** Initializes a CycleGraph object. */
+CycleGraph::CycleGraph() :
+ discovered(new HashTable<const CycleNode *, const CycleNode *, uintptr_t, 4, model_malloc, model_calloc, model_free>(16)),
+ hasCycles(false),
+ oldCycles(false),
+ hasRMWViolation(false),
+ oldRMWViolation(false)
+{
+}
-CycleGraph::CycleGraph() {
- hasCycles=false;
+/** CycleGraph destructor */
+CycleGraph::~CycleGraph()
+{
+ delete discovered;
}
-/** Returns the CycleNode for a given ModelAction. */
+/**
+ * Add a CycleNode to the graph, corresponding to a store ModelAction
+ * @param act The write action that should be added
+ * @param node The CycleNode that corresponds to the store
+ */
+void CycleGraph::putNode(const ModelAction *act, CycleNode *node)
+{
+ actionToNode.put(act, node);
+#if SUPPORT_MOD_ORDER_DUMP
+ nodeList.push_back(node);
+#endif
+}
-CycleNode * CycleGraph::getNode(ModelAction * action) {
- CycleNode *node=actionToNode.get(action);
- if (node==NULL) {
- node=new CycleNode(action);
- actionToNode.put(action, node);
+/**
+ * @brief Returns the CycleNode corresponding to a given ModelAction
+ * @param action The ModelAction to find a node for
+ * @return The CycleNode paired with this action
+ */
+CycleNode * CycleGraph::getNode(const ModelAction *action)
+{
+ CycleNode *node = actionToNode.get(action);
+ if (node == NULL) {
+ node = new CycleNode(action);
+ putNode(action, node);
}
return node;
}
-/** Adds an edge between two ModelActions. */
+/**
+ * Adds an edge between two ModelActions. The ModelAction @a to is ordered
+ * after the ModelAction @a from.
+ * @param to The edge points to this ModelAction
+ * @param from The edge comes from this ModelAction
+ */
+void CycleGraph::addEdge(const ModelAction *from, const ModelAction *to)
+{
+ ASSERT(from);
+ ASSERT(to);
+
+ CycleNode *fromnode = getNode(from);
+ CycleNode *tonode = getNode(to);
+
+ if (!hasCycles)
+ hasCycles = edgeCreatesCycle(fromnode, tonode);
+
+ if (fromnode->addEdge(tonode))
+ rollbackvector.push_back(fromnode);
+
+
+ CycleNode *rmwnode = fromnode->getRMW();
+
+ /*
+ * If the fromnode has a rmwnode that is not the tonode, we should add
+ * an edge between its rmwnode and the tonode
+ *
+ * If tonode is also a rmw, don't do this check as the execution is
+ * doomed and we'll catch the problem elsewhere, but we want to allow
+ * for the possibility of sending to's write value to rmwnode
+ */
+ if (rmwnode != NULL && !to->is_rmw()) {
+ if (!hasCycles)
+ hasCycles = edgeCreatesCycle(rmwnode, tonode);
+
+ if (rmwnode->addEdge(tonode))
+ rollbackvector.push_back(rmwnode);
+ }
+}
+
+/** Handles special case of a RMW action. The ModelAction rmw reads
+ * from the ModelAction from. The key differences are: (1) no write
+ * can occur in between the rmw and the from action. Only one RMW
+ * action can read from a given write.
+ */
+void CycleGraph::addRMWEdge(const ModelAction *from, const ModelAction *rmw)
+{
+ ASSERT(from);
+ ASSERT(rmw);
+
+ CycleNode *fromnode = getNode(from);
+ CycleNode *rmwnode = getNode(rmw);
+
+ /* Two RMW actions cannot read from the same write. */
+ if (fromnode->setRMW(rmwnode)) {
+ hasRMWViolation = true;
+ } else {
+ rmwrollbackvector.push_back(fromnode);
+ }
+
+ /* Transfer all outgoing edges from the from node to the rmw node */
+ /* This process should not add a cycle because either:
+ * (1) The rmw should not have any incoming edges yet if it is the
+ * new node or
+ * (2) the fromnode is the new node and therefore it should not
+ * have any outgoing edges.
+ */
+ for (unsigned int i = 0; i < fromnode->getNumEdges(); i++) {
+ CycleNode *tonode = fromnode->getEdge(i);
+ if (tonode != rmwnode) {
+ if (rmwnode->addEdge(tonode))
+ rollbackvector.push_back(rmwnode);
+ }
+ }
+
+ if (!hasCycles)
+ hasCycles = edgeCreatesCycle(fromnode, rmwnode);
+
+ if (fromnode->addEdge(rmwnode))
+ rollbackvector.push_back(fromnode);
+}
-void CycleGraph::addEdge(ModelAction *from, ModelAction *to) {
- CycleNode *fromnode=getNode(from);
- CycleNode *tonode=getNode(to);
- if (!hasCycles) {
- // Check for Cycles
- hasCycles=checkReachable(fromnode, tonode);
+#if SUPPORT_MOD_ORDER_DUMP
+void CycleGraph::dumpNodes(FILE *file) const
+{
+ for (unsigned int i = 0; i < nodeList.size(); i++) {
+ CycleNode *cn = nodeList[i];
+ const ModelAction *action = cn->getAction();
+ fprintf(file, "N%u [label=\"%u, T%u\"];\n", action->get_seq_number(), action->get_seq_number(), action->get_tid());
+ if (cn->getRMW() != NULL) {
+ fprintf(file, "N%u -> N%u[style=dotted];\n", action->get_seq_number(), cn->getRMW()->getAction()->get_seq_number());
+ }
+ for (unsigned int j = 0; j < cn->getNumEdges(); j++) {
+ CycleNode *dst = cn->getEdge(j);
+ const ModelAction *dstaction = dst->getAction();
+ fprintf(file, "N%u -> N%u;\n", action->get_seq_number(), dstaction->get_seq_number());
+ }
}
- fromnode->addEdge(tonode);
}
-/** Checks whether the first CycleNode can reach the second one. */
+void CycleGraph::dumpGraphToFile(const char *filename) const
+{
+ char buffer[200];
+ sprintf(buffer, "%s.dot", filename);
+ FILE *file = fopen(buffer, "w");
+ fprintf(file, "digraph %s {\n", filename);
+ dumpNodes(file);
+ fprintf(file, "}\n");
+ fclose(file);
+}
+#endif
+
+/**
+ * Checks whether the addition of an edge between these two nodes would create
+ * a cycle in the graph.
+ * @param from The CycleNode from which the edge would start
+ * @param to The CycleNode to which the edge would point
+ * @return True if this edge would create a cycle; false otherwise
+ */
+bool CycleGraph::edgeCreatesCycle(const CycleNode *from, const CycleNode *to) const
+{
+ return (from == to) || checkReachable(to, from);
+}
+
+/**
+ * Checks whether one ModelAction can reach another.
+ * @param from The ModelAction from which to begin exploration
+ * @param to The ModelAction to reach
+ * @return True, @a from can reach @a to; otherwise, false
+ */
+bool CycleGraph::checkReachable(const ModelAction *from, const ModelAction *to) const
+{
+ CycleNode *fromnode = actionToNode.get(from);
+ CycleNode *tonode = actionToNode.get(to);
+
+ if (!fromnode || !tonode)
+ return false;
+
+ return checkReachable(fromnode, tonode);
+}
+
+/**
+ * Checks whether one CycleNode can reach another.
+ * @param from The CycleNode from which to begin exploration
+ * @param to The CycleNode to reach
+ * @return True, @a from can reach @a to; otherwise, false
+ */
+bool CycleGraph::checkReachable(const CycleNode *from, const CycleNode *to) const
+{
+ std::vector< const CycleNode *, ModelAlloc<const CycleNode *> > queue;
+ discovered->reset();
+
+ queue.push_back(from);
+ discovered->put(from, from);
+ while (!queue.empty()) {
+ const CycleNode *node = queue.back();
+ queue.pop_back();
+ if (node == to)
+ return true;
+
+ for (unsigned int i = 0; i < node->getNumEdges(); i++) {
+ CycleNode *next = node->getEdge(i);
+ if (!discovered->contains(next)) {
+ discovered->put(next, next);
+ queue.push_back(next);
+ }
+ }
+ }
+ return false;
+}
-bool CycleGraph::checkReachable(CycleNode *from, CycleNode *to) {
- std::vector<CycleNode *> queue;
- HashTable<CycleNode *, CycleNode *, uintptr_t, 4> discovered;
+bool CycleGraph::checkPromise(const ModelAction *fromact, Promise *promise) const
+{
+ std::vector< CycleNode *, ModelAlloc<CycleNode *> > queue;
+ discovered->reset();
+ CycleNode *from = actionToNode.get(fromact);
queue.push_back(from);
- discovered.put(from, from);
- while(!queue.empty()) {
- CycleNode * node=queue.back();
+ discovered->put(from, from);
+ while (!queue.empty()) {
+ CycleNode *node = queue.back();
queue.pop_back();
- if (node==to)
+
+ if (promise->increment_threads(node->getAction()->get_tid())) {
return true;
+ }
- for(unsigned int i=0;i<node->getEdges()->size();i++) {
- CycleNode *next=(*node->getEdges())[i];
- if (!discovered.contains(next)) {
- discovered.put(next,next);
+ for (unsigned int i = 0; i < node->getNumEdges(); i++) {
+ CycleNode *next = node->getEdge(i);
+ if (!discovered->contains(next)) {
+ discovered->put(next, next);
queue.push_back(next);
}
}
return false;
}
-/** Returns whether a CycleGraph contains cycles. */
-bool CycleGraph::checkForCycles() {
+void CycleGraph::startChanges()
+{
+ ASSERT(rollbackvector.size() == 0);
+ ASSERT(rmwrollbackvector.size() == 0);
+ ASSERT(oldCycles == hasCycles);
+ ASSERT(oldRMWViolation == hasRMWViolation);
+}
+
+/** Commit changes to the cyclegraph. */
+void CycleGraph::commitChanges()
+{
+ rollbackvector.resize(0);
+ rmwrollbackvector.resize(0);
+ oldCycles = hasCycles;
+ oldRMWViolation = hasRMWViolation;
+}
+
+/** Rollback changes to the previous commit. */
+void CycleGraph::rollbackChanges()
+{
+ for (unsigned int i = 0; i < rollbackvector.size(); i++) {
+ rollbackvector[i]->popEdge();
+ }
+
+ for (unsigned int i = 0; i < rmwrollbackvector.size(); i++) {
+ rmwrollbackvector[i]->clearRMW();
+ }
+
+ hasCycles = oldCycles;
+ hasRMWViolation = oldRMWViolation;
+ rollbackvector.resize(0);
+ rmwrollbackvector.resize(0);
+}
+
+/** @returns whether a CycleGraph contains cycles. */
+bool CycleGraph::checkForCycles() const
+{
return hasCycles;
}
-/** Constructor for a CycleNode. */
+bool CycleGraph::checkForRMWViolation() const
+{
+ return hasRMWViolation;
+}
+
+/**
+ * @brief Constructor for a CycleNode
+ * @param act The ModelAction for this node
+ */
+CycleNode::CycleNode(const ModelAction *act) :
+ action(act),
+ hasRMW(NULL)
+{
+}
-CycleNode::CycleNode(ModelAction *modelaction) {
- action=modelaction;
+/**
+ * @param i The index of the edge to return
+ * @returns The a CycleNode edge indexed by i
+ */
+CycleNode * CycleNode::getEdge(unsigned int i) const
+{
+ return edges[i];
}
-/** Returns a vector of the edges from a CycleNode. */
+/** @returns The number of edges leaving this CycleNode */
+unsigned int CycleNode::getNumEdges() const
+{
+ return edges.size();
+}
-std::vector<CycleNode *> * CycleNode::getEdges() {
- return &edges;
+CycleNode * CycleNode::getBackEdge(unsigned int i) const
+{
+ return back_edges[i];
}
-/** Adds an edge to a CycleNode. */
+unsigned int CycleNode::getNumBackEdges() const
+{
+ return back_edges.size();
+}
-void CycleNode::addEdge(CycleNode * node) {
+/**
+ * Adds an edge from this CycleNode to another CycleNode.
+ * @param node The node to which we add a directed edge
+ */
+bool CycleNode::addEdge(CycleNode *node)
+{
+ for (unsigned int i = 0; i < edges.size(); i++)
+ if (edges[i] == node)
+ return false;
edges.push_back(node);
+ node->back_edges.push_back(this);
+ return true;
+}
+
+/** @returns the RMW CycleNode that reads from the current CycleNode */
+CycleNode * CycleNode::getRMW() const
+{
+ return hasRMW;
+}
+
+/**
+ * Set a RMW action node that reads from the current CycleNode.
+ * @param node The RMW that reads from the current node
+ * @return True, if this node already was read by another RMW; false otherwise
+ * @see CycleGraph::addRMWEdge
+ */
+bool CycleNode::setRMW(CycleNode *node)
+{
+ if (hasRMW != NULL)
+ return true;
+ hasRMW = node;
+ return false;
}
projects / c11tester.git / blobdiff