X-Git-Url: http://plrg.eecs.uci.edu/git/?p=c11tester.git;a=blobdiff_plain;f=cyclegraph.cc;h=1d9533f4ba9b6f2fa61ae0018bb36dc22de5abcc;hp=eaddc8e1714629f8834a5b11c891f8009b2e1237;hb=251ac4b4bf3a9f2d3cfacc1e6618200ca1c431ac;hpb=62dbff8dbca80ded5959e88ec9c177bef9108546 diff --git a/cyclegraph.cc b/cyclegraph.cc index eaddc8e1..1d9533f4 100644 --- a/cyclegraph.cc +++ b/cyclegraph.cc @@ -1,21 +1,19 @@ #include "cyclegraph.h" #include "action.h" #include "common.h" -#include "promise.h" -#include "model.h" +#include "threads-model.h" +#include "clockvector.h" /** Initializes a CycleGraph object. */ CycleGraph::CycleGraph() : - discovered(new HashTable(16)), - hasCycles(false), - oldCycles(false) + queue(new SnapVector()) { } /** CycleGraph destructor */ CycleGraph::~CycleGraph() { - delete discovered; + delete queue; } /** @@ -37,12 +35,6 @@ CycleNode * CycleGraph::getNode_noCreate(const ModelAction *act) const return actionToNode.get(act); } -/** @return The corresponding CycleNode, if exists; otherwise NULL */ -CycleNode * CycleGraph::getNode_noCreate(const Promise *promise) const -{ - return readerToPromiseNode.get(promise->get_action()); -} - /** * @brief Returns the CycleNode corresponding to a given ModelAction * @@ -51,7 +43,7 @@ CycleNode * CycleGraph::getNode_noCreate(const Promise *promise) const * @param action The ModelAction to find a node for * @return The CycleNode paired with this action */ -CycleNode * CycleGraph::getNode(const ModelAction *action) +CycleNode * CycleGraph::getNode(ModelAction *action) { CycleNode *node = getNode_noCreate(action); if (node == NULL) { @@ -61,140 +53,45 @@ CycleNode * CycleGraph::getNode(const ModelAction *action) return node; } -/** - * @brief Returns a CycleNode corresponding to a promise - * - * Gets (or creates, if none exist) a CycleNode corresponding to a promised - * value. - * - * @param promise The Promise generated by a reader - * @return The CycleNode corresponding to the Promise - */ -CycleNode * CycleGraph::getNode(const Promise *promise) -{ - const ModelAction *reader = promise->get_action(); - CycleNode *node = getNode_noCreate(promise); - if (node == NULL) { - node = new CycleNode(promise); - readerToPromiseNode.put(reader, node); - } - return node; -} - -/** - * @return false if the resolution results in a cycle; true otherwise - */ -bool CycleGraph::resolvePromise(ModelAction *reader, ModelAction *writer, - promise_list_t *mustResolve) -{ - CycleNode *promise_node = readerToPromiseNode.get(reader); - CycleNode *w_node = actionToNode.get(writer); - ASSERT(promise_node); - - if (w_node) - return mergeNodes(w_node, promise_node, mustResolve); - /* No existing write-node; just convert the promise-node */ - promise_node->resolvePromise(writer); - readerToPromiseNode.put(reader, NULL); /* erase promise_node */ - putNode(writer, promise_node); - return true; -} - -/** - * @brief Merge two CycleNodes that represent the same write - * - * Note that this operation cannot be rolled back. - * - * @param w_node The write ModelAction node with which to merge - * @param p_node The Promise node to merge. Will be destroyed after this - * function. - * @param mustMerge Return (pass-by-reference) any additional Promises that - * must also be merged with w_node - * - * @return false if the merge results in a cycle; true otherwise - */ -bool CycleGraph::mergeNodes(CycleNode *w_node, CycleNode *p_node, - promise_list_t *mustMerge) -{ - ASSERT(!w_node->is_promise()); - ASSERT(p_node->is_promise()); - const Promise *promise = p_node->getPromise(); - if (!promise->is_compatible(w_node->getAction())) { - hasCycles = true; - return false; - } - - /* Transfer back edges to w_node */ - while (p_node->getNumBackEdges() > 0) { - CycleNode *back = p_node->removeBackEdge(); - if (back != w_node) { - if (back->is_promise()) { - if (checkReachable(w_node, back)) { - /* Edge would create cycle; merge instead */ - mustMerge->push_back(back->getPromise()); - if (!mergeNodes(w_node, back, mustMerge)) - return false; - } else - back->addEdge(w_node); - } else - addNodeEdge(back, w_node); - } - } - - /* Transfer forward edges to w_node */ - while (p_node->getNumEdges() > 0) { - CycleNode *forward = p_node->removeEdge(); - if (forward != w_node) { - if (forward->is_promise()) { - if (checkReachable(forward, w_node)) { - mustMerge->push_back(forward->getPromise()); - if (!mergeNodes(w_node, forward, mustMerge)) - return false; - } else - w_node->addEdge(forward); - } else - addNodeEdge(w_node, forward); - } - } - - /* erase p_node */ - readerToPromiseNode.put(promise->get_action(), NULL); - delete p_node; - - return !hasCycles; -} - /** * Adds an edge between two CycleNodes. * @param fromnode The edge comes from this CycleNode * @param tonode The edge points to this CycleNode * @return True, if new edge(s) are added; otherwise false */ -bool CycleGraph::addNodeEdge(CycleNode *fromnode, CycleNode *tonode) +void CycleGraph::addNodeEdge(CycleNode *fromnode, CycleNode *tonode, bool forceedge) { - bool added; - - if (!hasCycles) - hasCycles = checkReachable(tonode, fromnode); - - if ((added = fromnode->addEdge(tonode))) - rollbackvector.push_back(fromnode); + //quick check whether edge is redundant + if (checkReachable(fromnode, tonode) && !forceedge) { + return; + } /* - * If the fromnode has a rmwnode that is not the tonode, we should add - * an edge between its rmwnode and the tonode + * If the fromnode has a rmwnode, we should + * follow its RMW chain to add an edge at the end. */ - CycleNode *rmwnode = fromnode->getRMW(); - if (rmwnode && rmwnode != tonode) { - if (!hasCycles) - hasCycles = checkReachable(tonode, rmwnode); - - if (rmwnode->addEdge(tonode)) { - rollbackvector.push_back(rmwnode); - added = true; + while (CycleNode * nextnode = fromnode->getRMW()) { + if (nextnode == tonode) + break; + fromnode = nextnode; + } + + fromnode->addEdge(tonode); //Add edge to edgeSrcNode + + /* Propagate clock vector changes */ + if (tonode->cv->merge(fromnode->cv)) { + queue->push_back(tonode); + while(!queue->empty()) { + const CycleNode *node = queue->back(); + queue->pop_back(); + unsigned int numedges = node->getNumEdges(); + for(unsigned int i = 0;i < numedges;i++) { + CycleNode * enode = node->getEdge(i); + if (enode->cv->merge(node->cv)) + queue->push_back(enode); + } } } - return added; } /** @@ -202,26 +99,24 @@ bool CycleGraph::addNodeEdge(CycleNode *fromnode, CycleNode *tonode) * * 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. + * -# No write can occur in between the @a rmw and @a from actions. + * -# 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 + * the ModelAction from */ -void CycleGraph::addRMWEdge(const ModelAction *from, const ModelAction *rmw) +void CycleGraph::addRMWEdge(ModelAction *from, ModelAction *rmw) { ASSERT(from); ASSERT(rmw); CycleNode *fromnode = getNode(from); CycleNode *rmwnode = getNode(rmw); + /* We assume that this RMW has no RMW reading from it yet */ + ASSERT(!rmwnode->getRMW()); - /* Two RMW actions cannot read from the same write. */ - if (fromnode->setRMW(rmwnode)) - hasCycles = true; - else - rmwrollbackvector.push_back(fromnode); + fromnode->setRMW(rmwnode); /* Transfer all outgoing edges from the from node to the rmw node */ /* This process should not add a cycle because either: @@ -230,32 +125,128 @@ void CycleGraph::addRMWEdge(const ModelAction *from, const ModelAction *rmw) * (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++) { + 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); + rmwnode->addEdge(tonode); + } + tonode->removeInEdge(fromnode); + } + fromnode->edges.clear(); + + addNodeEdge(fromnode, rmwnode, true); +} + +void CycleGraph::addEdges(SnapList * edgeset, ModelAction *to) { + for(sllnode * it = edgeset->begin();it!=NULL;) { + ModelAction *act = it->getVal(); + CycleNode *node = getNode(act); + sllnode * it2 = it; + it2=it2->getNext(); + for(;it2!=NULL; ) { + ModelAction *act2 = it2->getVal(); + CycleNode *node2 = getNode(act2); + if (checkReachable(node, node2)) { + it = edgeset->erase(it); + goto endouterloop; + } else if (checkReachable(node2, node)) { + it2 = edgeset->erase(it2); + goto endinnerloop; + } + it2=it2->getNext(); +endinnerloop: + ; } + it=it->getNext(); +endouterloop: + ; } + for(sllnode *it = edgeset->begin();it!=NULL;it=it->getNext()) { + ModelAction *from = it->getVal(); + addEdge(from, to, from->get_tid() == to->get_tid()); + } +} + +/** + * @brief Adds an edge between objects + * + * This function will add an edge between any two objects which can be + * associated with a CycleNode. That is, if they have a CycleGraph::getNode + * implementation. + * + * The object to is ordered after the object from. + * + * @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 + */ - addNodeEdge(fromnode, rmwnode); +void CycleGraph::addEdge(ModelAction *from, ModelAction *to) +{ + ASSERT(from); + ASSERT(to); + + CycleNode *fromnode = getNode(from); + CycleNode *tonode = getNode(to); + + addNodeEdge(fromnode, tonode, false); +} + +void CycleGraph::addEdge(ModelAction *from, ModelAction *to, bool forceedge) +{ + ASSERT(from); + ASSERT(to); + + CycleNode *fromnode = getNode(from); + CycleNode *tonode = getNode(to); + + addNodeEdge(fromnode, tonode, forceedge); } #if SUPPORT_MOD_ORDER_DUMP + +static void print_node(FILE *file, const CycleNode *node, int label) +{ + const ModelAction *act = node->getAction(); + modelclock_t idx = act->get_seq_number(); + fprintf(file, "N%u", idx); + if (label) + fprintf(file, " [label=\"N%u, T%u\"]", idx, act->get_tid()); +} + +static void print_edge(FILE *file, const CycleNode *from, const CycleNode *to, const char *prop) +{ + print_node(file, from, 0); + fprintf(file, " -> "); + print_node(file, to, 0); + if (prop && strlen(prop)) + fprintf(file, " [%s]", prop); + fprintf(file, ";\n"); +} + +void CycleGraph::dot_print_node(FILE *file, const ModelAction *act) +{ + print_node(file, getNode(act), 1); +} + +void CycleGraph::dot_print_edge(FILE *file, const ModelAction *from, const ModelAction *to, const char *prop) +{ + CycleNode *fromnode = getNode(from); + CycleNode *tonode = getNode(to); + + print_edge(file, fromnode, tonode, prop); +} + 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()); - } + for (unsigned int i = 0;i < nodeList.size();i++) { + CycleNode *n = nodeList[i]; + print_node(file, n, 1); + fprintf(file, ";\n"); + if (n->getRMW()) + print_edge(file, n, n->getRMW(), "style=dotted"); + for (unsigned int j = 0;j < n->getNumEdges();j++) + print_edge(file, n, n->getEdge(j), NULL); } } @@ -279,116 +270,77 @@ void CycleGraph::dumpGraphToFile(const char *filename) const */ bool CycleGraph::checkReachable(const CycleNode *from, const CycleNode *to) const { - std::vector< const CycleNode *, ModelAlloc > 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; -} - -/** @return True, if the promise has failed; false otherwise */ -bool CycleGraph::checkPromise(const ModelAction *fromact, Promise *promise) const -{ - std::vector< CycleNode *, ModelAlloc > queue; - discovered->reset(); - CycleNode *from = actionToNode.get(fromact); - - queue.push_back(from); - discovered->put(from, from); - while (!queue.empty()) { - CycleNode *node = queue.back(); - queue.pop_back(); - - if (!node->is_promise() && - promise->eliminate_thread(node->getAction()->get_tid())) - 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; -} - -void CycleGraph::startChanges() -{ - ASSERT(rollbackvector.empty()); - ASSERT(rmwrollbackvector.empty()); - ASSERT(oldCycles == hasCycles); -} - -/** Commit changes to the cyclegraph. */ -void CycleGraph::commitChanges() -{ - rollbackvector.clear(); - rmwrollbackvector.clear(); - oldCycles = hasCycles; + return to->cv->synchronized_since(from->action); } -/** Rollback changes to the previous commit. */ -void CycleGraph::rollbackChanges() +/** + * Checks whether one ModelAction can reach another ModelAction + * @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 { - for (unsigned int i = 0; i < rollbackvector.size(); i++) - rollbackvector[i]->popEdge(); + CycleNode *fromnode = getNode_noCreate(from); + CycleNode *tonode = getNode_noCreate(to); - for (unsigned int i = 0; i < rmwrollbackvector.size(); i++) - rmwrollbackvector[i]->clearRMW(); + if (!fromnode || !tonode) + return false; - hasCycles = oldCycles; - rollbackvector.clear(); - rmwrollbackvector.clear(); + return checkReachable(fromnode, tonode); } -/** @returns whether a CycleGraph contains cycles. */ -bool CycleGraph::checkForCycles() const -{ - return hasCycles; +void CycleGraph::freeAction(const ModelAction * act) { + CycleNode *cn = actionToNode.remove(act); + for(unsigned int i=0;iedges.size();i++) { + CycleNode *dst = cn->edges[i]; + dst->removeInEdge(cn); + } + for(unsigned int i=0;iinedges.size();i++) { + CycleNode *src = cn->inedges[i]; + src->removeEdge(cn); + } + delete cn; } /** * @brief Constructor for a CycleNode * @param act The ModelAction for this node */ -CycleNode::CycleNode(const ModelAction *act) : +CycleNode::CycleNode(ModelAction *act) : action(act), - promise(NULL), - hasRMW(NULL) + hasRMW(NULL), + cv(new ClockVector(NULL, act)) { } -/** - * @brief Constructor for a Promise CycleNode - * @param promise The Promise which was generated - */ -CycleNode::CycleNode(const Promise *promise) : - action(NULL), - promise(promise), - hasRMW(NULL) -{ +CycleNode::~CycleNode() { + delete cv; +} + +void CycleNode::removeInEdge(CycleNode *src) { + for(unsigned int i=0;i < inedges.size();i++) { + if (inedges[i] == src) { + inedges[i] = inedges[inedges.size()-1]; + inedges.pop_back(); + break; + } + } +} + +void CycleNode::removeEdge(CycleNode *dst) { + for(unsigned int i=0;i < edges.size();i++) { + if (edges[i] == dst) { + edges[i] = edges[edges.size()-1]; + edges.pop_back(); + break; + } + } } /** * @param i The index of the edge to return - * @returns The a CycleNode edge indexed by i + * @returns The CycleNode edge indexed by i */ CycleNode * CycleNode::getEdge(unsigned int i) const { @@ -401,62 +353,19 @@ unsigned int CycleNode::getNumEdges() const return edges.size(); } -CycleNode * CycleNode::getBackEdge(unsigned int i) const -{ - return back_edges[i]; -} - -unsigned int CycleNode::getNumBackEdges() const -{ - return back_edges.size(); -} - -/** - * @brief Remove an element from a vector - * @param v The vector - * @param n The element to remove - * @return True if the element was found; false otherwise - */ -template -static bool vector_remove_node(std::vector >& v, const T n) -{ - for (unsigned int i = 0; i < v.size(); i++) { - if (v[i] == n) { - v.erase(v.begin() + i); - return true; - } - } - return false; -} - /** - * @brief Remove a (forward) edge from this CycleNode - * @return The CycleNode which was popped, if one exists; otherwise NULL + * @param i The index of the edge to return + * @returns The CycleNode edge indexed by i */ -CycleNode * CycleNode::removeEdge() +CycleNode * CycleNode::getInEdge(unsigned int i) const { - if (edges.empty()) - return NULL; - - CycleNode *ret = edges.back(); - edges.pop_back(); - vector_remove_node(ret->back_edges, this); - return ret; + return inedges[i]; } -/** - * @brief Remove a (back) edge from this CycleNode - * @return The CycleNode which was popped, if one exists; otherwise NULL - */ -CycleNode * CycleNode::removeBackEdge() +/** @returns The number of edges leaving this CycleNode */ +unsigned int CycleNode::getNumInEdges() const { - if (back_edges.empty()) - return NULL; - - CycleNode *ret = back_edges.back(); - back_edges.pop_back(); - vector_remove_node(ret->edges, this); - return ret; + return inedges.size(); } /** @@ -464,14 +373,13 @@ CycleNode * CycleNode::removeBackEdge() * @param node The node to which we add a directed edge * @return True if this edge is a new edge; false otherwise */ -bool CycleNode::addEdge(CycleNode *node) +void CycleNode::addEdge(CycleNode *node) { - for (unsigned int i = 0; i < edges.size(); i++) + for (unsigned int i = 0;i < edges.size();i++) if (edges[i] == node) - return false; + return; edges.push_back(node); - node->back_edges.push_back(this); - return true; + node->inedges.push_back(this); } /** @returns the RMW CycleNode that reads from the current CycleNode */ @@ -493,19 +401,3 @@ bool CycleNode::setRMW(CycleNode *node) hasRMW = node; return false; } - -/** - * Convert a Promise CycleNode into a concrete-valued CycleNode. Should only be - * used when there's no existing ModelAction CycleNode for this write. - * - * @param writer The ModelAction which wrote the future value represented by - * this CycleNode - */ -void CycleNode::resolvePromise(const ModelAction *writer) -{ - ASSERT(is_promise()); - ASSERT(promise->is_compatible(writer)); - action = writer; - promise = NULL; - ASSERT(!is_promise()); -}