1 #include "cyclegraph.h"
4 #include "threads-model.h"
5 #include "clockvector.h"
7 /** Initializes a CycleGraph object. */
8 CycleGraph::CycleGraph() :
9 queue(new SnapVector<const CycleNode *>())
13 /** CycleGraph destructor */
14 CycleGraph::~CycleGraph()
20 * Add a CycleNode to the graph, corresponding to a store ModelAction
21 * @param act The write action that should be added
22 * @param node The CycleNode that corresponds to the store
24 void CycleGraph::putNode(const ModelAction *act, CycleNode *node)
26 actionToNode.put(act, node);
27 #if SUPPORT_MOD_ORDER_DUMP
28 nodeList.push_back(node);
32 /** @return The corresponding CycleNode, if exists; otherwise NULL */
33 CycleNode * CycleGraph::getNode_noCreate(const ModelAction *act) const
35 return actionToNode.get(act);
39 * @brief Returns the CycleNode corresponding to a given ModelAction
41 * Gets (or creates, if none exist) a CycleNode corresponding to a ModelAction
43 * @param action The ModelAction to find a node for
44 * @return The CycleNode paired with this action
46 CycleNode * CycleGraph::getNode(const ModelAction *action)
48 CycleNode *node = getNode_noCreate(action);
50 node = new CycleNode(action);
51 putNode(action, node);
57 * Adds an edge between two CycleNodes.
58 * @param fromnode The edge comes from this CycleNode
59 * @param tonode The edge points to this CycleNode
60 * @return True, if new edge(s) are added; otherwise false
62 void CycleGraph::addNodeEdge(CycleNode *fromnode, CycleNode *tonode)
64 //quick check whether edge is redundant
65 if (checkReachable(fromnode, tonode))
68 CycleNode *edgeSrcNode = fromnode;
71 * If the fromnode has a rmwnode, we should
72 * follow its RMW chain to add an edge at the end.
74 CycleNode *rmwnode = fromnode->getRMW();
76 while (rmwnode->getRMW())
77 rmwnode = rmwnode->getRMW();
78 edgeSrcNode = rmwnode;
81 edgeSrcNode->addEdge(tonode); //Add edge to edgeSrcNode
83 /* Propagate clock vector changes */
84 if (tonode->cv->merge(edgeSrcNode->cv)) {
85 queue->push_back(edgeSrcNode);
86 while(!queue->empty()) {
87 const CycleNode *node = queue->back();
88 unsigned int numedges = node->getNumEdges();
89 for(unsigned int i = 0;i < numedges;i++) {
90 CycleNode * enode = node->getEdge(i);
91 if (enode->cv->merge(node->cv))
92 queue->push_back(enode);
99 * @brief Add an edge between a write and the RMW which reads from it
101 * Handles special case of a RMW action, where the ModelAction rmw reads from
102 * the ModelAction from. The key differences are:
103 * -# No write can occur in between the @a rmw and @a from actions.
104 * -# Only one RMW action can read from a given write.
106 * @param from The edge comes from this ModelAction
107 * @param rmw The edge points to this ModelAction; this action must read from
108 * the ModelAction from
110 void CycleGraph::addRMWEdge(const ModelAction *from, const ModelAction *rmw)
115 CycleNode *fromnode = getNode(from);
116 CycleNode *rmwnode = getNode(rmw);
118 /* We assume that this RMW has no RMW reading from it yet */
119 ASSERT(!rmwnode->getRMW());
121 fromnode->setRMW(rmwnode);
123 /* Transfer all outgoing edges from the from node to the rmw node */
124 /* This process should not add a cycle because either:
125 * (1) The rmw should not have any incoming edges yet if it is the
127 * (2) the fromnode is the new node and therefore it should not
128 * have any outgoing edges.
130 for (unsigned int i = 0;i < fromnode->getNumEdges();i++) {
131 CycleNode *tonode = fromnode->getEdge(i);
132 if (tonode != rmwnode) {
133 rmwnode->addEdge(tonode);
137 addNodeEdge(fromnode, rmwnode);
141 * @brief Adds an edge between objects
143 * This function will add an edge between any two objects which can be
144 * associated with a CycleNode. That is, if they have a CycleGraph::getNode
147 * The object to is ordered after the object from.
149 * @param to The edge points to this object, of type T
150 * @param from The edge comes from this object, of type U
151 * @return True, if new edge(s) are added; otherwise false
154 void CycleGraph::addEdge(const ModelAction *from, const ModelAction *to)
159 CycleNode *fromnode = getNode(from);
160 CycleNode *tonode = getNode(to);
162 addNodeEdge(fromnode, tonode);
165 #if SUPPORT_MOD_ORDER_DUMP
167 static void print_node(FILE *file, const CycleNode *node, int label)
169 const ModelAction *act = node->getAction();
170 modelclock_t idx = act->get_seq_number();
171 fprintf(file, "N%u", idx);
173 fprintf(file, " [label=\"N%u, T%u\"]", idx, act->get_tid());
176 static void print_edge(FILE *file, const CycleNode *from, const CycleNode *to, const char *prop)
178 print_node(file, from, 0);
179 fprintf(file, " -> ");
180 print_node(file, to, 0);
181 if (prop && strlen(prop))
182 fprintf(file, " [%s]", prop);
183 fprintf(file, ";\n");
186 void CycleGraph::dot_print_node(FILE *file, const ModelAction *act)
188 print_node(file, getNode(act), 1);
191 void CycleGraph::dot_print_edge(FILE *file, const ModelAction *from, const ModelAction *to, const char *prop)
193 CycleNode *fromnode = getNode(from);
194 CycleNode *tonode = getNode(to);
196 print_edge(file, fromnode, tonode, prop);
199 void CycleGraph::dumpNodes(FILE *file) const
201 for (unsigned int i = 0;i < nodeList.size();i++) {
202 CycleNode *n = nodeList[i];
203 print_node(file, n, 1);
204 fprintf(file, ";\n");
206 print_edge(file, n, n->getRMW(), "style=dotted");
207 for (unsigned int j = 0;j < n->getNumEdges();j++)
208 print_edge(file, n, n->getEdge(j), NULL);
212 void CycleGraph::dumpGraphToFile(const char *filename) const
215 sprintf(buffer, "%s.dot", filename);
216 FILE *file = fopen(buffer, "w");
217 fprintf(file, "digraph %s {\n", filename);
219 fprintf(file, "}\n");
225 * Checks whether one CycleNode can reach another.
226 * @param from The CycleNode from which to begin exploration
227 * @param to The CycleNode to reach
228 * @return True, @a from can reach @a to; otherwise, false
230 bool CycleGraph::checkReachable(const CycleNode *from, const CycleNode *to) const
232 return to->cv->synchronized_since(from->action);
236 * Checks whether one ModelAction can reach another ModelAction
237 * @param from The ModelAction from which to begin exploration
238 * @param to The ModelAction to reach
239 * @return True, @a from can reach @a to; otherwise, false
241 bool CycleGraph::checkReachable(const ModelAction *from, const ModelAction *to) const
243 CycleNode *fromnode = getNode_noCreate(from);
244 CycleNode *tonode = getNode_noCreate(to);
246 if (!fromnode || !tonode)
249 return checkReachable(fromnode, tonode);
253 * @brief Constructor for a CycleNode
254 * @param act The ModelAction for this node
256 CycleNode::CycleNode(const ModelAction *act) :
259 cv(new ClockVector(NULL, act))
264 * @param i The index of the edge to return
265 * @returns The CycleNode edge indexed by i
267 CycleNode * CycleNode::getEdge(unsigned int i) const
272 /** @returns The number of edges leaving this CycleNode */
273 unsigned int CycleNode::getNumEdges() const
279 * @brief Remove a (forward) edge from this CycleNode
280 * @return The CycleNode which was popped, if one exists; otherwise NULL
282 CycleNode * CycleNode::removeEdge()
287 CycleNode *ret = edges.back();
293 * Adds an edge from this CycleNode to another CycleNode.
294 * @param node The node to which we add a directed edge
295 * @return True if this edge is a new edge; false otherwise
297 void CycleNode::addEdge(CycleNode *node)
299 for (unsigned int i = 0;i < edges.size();i++)
300 if (edges[i] == node)
302 edges.push_back(node);
305 /** @returns the RMW CycleNode that reads from the current CycleNode */
306 CycleNode * CycleNode::getRMW() const
312 * Set a RMW action node that reads from the current CycleNode.
313 * @param node The RMW that reads from the current node
314 * @return True, if this node already was read by another RMW; false otherwise
315 * @see CycleGraph::addRMWEdge
317 bool CycleNode::setRMW(CycleNode *node)