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)
+ oldCycles(false)
{
}
CycleNode *fromnode = getNode(from);
CycleNode *tonode = getNode(to);
+ addEdge(fromnode, tonode);
+}
+
+/**
+ * Adds an edge between two CycleNodes.
+ * @param fromnode The edge comes from this CycleNode
+ * @param tonode The edge points to this CycleNode
+ */
+void CycleGraph::addEdge(CycleNode *fromnode, CycleNode *tonode)
+{
if (!hasCycles)
hasCycles = checkReachable(tonode, fromnode);
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()) {
+ CycleNode *rmwnode = fromnode->getRMW();
+ if (rmwnode && rmwnode != tonode) {
if (!hasCycles)
hasCycles = checkReachable(tonode, 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.
+/**
+ * @brief Add an edge between a write and the RMW which reads from it
+ *
+ * Handles special case of a RMW action, where 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.
+ * (2) Only one RMW action can read from a given write.
+ *
+ * @param from The edge comes from this ModelAction
+ * @param rmw The edge points to this ModelAction; this action must read from
+ * ModelAction from
*/
void CycleGraph::addRMWEdge(const ModelAction *from, const ModelAction *rmw)
{
CycleNode *rmwnode = getNode(rmw);
/* Two RMW actions cannot read from the same write. */
- if (fromnode->setRMW(rmwnode)) {
- hasRMWViolation = true;
- } else {
+ if (fromnode->setRMW(rmwnode))
+ hasCycles = 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:
}
}
- if (!hasCycles)
- hasCycles = checkReachable(rmwnode, fromnode);
-
- if (fromnode->addEdge(rmwnode))
- rollbackvector.push_back(fromnode);
+ addEdge(fromnode, rmwnode);
}
#if SUPPORT_MOD_ORDER_DUMP
void CycleGraph::startChanges()
{
- ASSERT(rollbackvector.size() == 0);
- ASSERT(rmwrollbackvector.size() == 0);
+ ASSERT(rollbackvector.empty());
+ ASSERT(rmwrollbackvector.empty());
ASSERT(oldCycles == hasCycles);
- ASSERT(oldRMWViolation == hasRMWViolation);
}
/** Commit changes to the cyclegraph. */
void CycleGraph::commitChanges()
{
- rollbackvector.resize(0);
- rmwrollbackvector.resize(0);
+ rollbackvector.clear();
+ rmwrollbackvector.clear();
oldCycles = hasCycles;
- oldRMWViolation = hasRMWViolation;
}
/** Rollback changes to the previous commit. */
void CycleGraph::rollbackChanges()
{
- for (unsigned int i = 0; i < rollbackvector.size(); i++) {
+ for (unsigned int i = 0; i < rollbackvector.size(); i++)
rollbackvector[i]->popEdge();
- }
- for (unsigned int i = 0; i < rmwrollbackvector.size(); i++) {
+ for (unsigned int i = 0; i < rmwrollbackvector.size(); i++)
rmwrollbackvector[i]->clearRMW();
- }
hasCycles = oldCycles;
- hasRMWViolation = oldRMWViolation;
- rollbackvector.resize(0);
- rmwrollbackvector.resize(0);
+ rollbackvector.clear();
+ rmwrollbackvector.clear();
}
/** @returns whether a CycleGraph contains cycles. */
return hasCycles;
}
-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),
+ promise(NULL),
+ hasRMW(NULL)
+{
+}
+
+/**
+ * @brief Constructor for a Promise CycleNode
+ * @param promise The Promise which was generated
+ */
+CycleNode::CycleNode(const Promise *promise) :
+ action(NULL),
+ promise(promise),
hasRMW(NULL)
{
}