#include "nodestack.h"
#include "action.h"
#include "common.h"
-#include "model.h"
#include "threads-model.h"
#include "modeltypes.h"
+#include "execution.h"
+#include "params.h"
/**
* @brief Node constructor
* as an empty stub, to represent the first thread "choice") and up to one
* parent.
*
+ * @param params The model-checker parameters
* @param act The ModelAction to associate with this Node. May be NULL.
* @param par The parent Node in the NodeStack. May be NULL if there is no
* parent.
* @param nthreads The number of threads which exist at this point in the
* execution trace.
*/
-Node::Node(ModelAction *act, Node *par, int nthreads, Node *prevfairness) :
+Node::Node(const struct model_params *params, ModelAction *act, Node *par,
+ int nthreads, Node *prevfairness) :
read_from_status(READ_FROM_PAST),
action(act),
+ params(params),
+ uninit_action(NULL),
parent(par),
num_threads(nthreads),
explored_children(num_threads),
relseq_break_writes(),
relseq_break_index(0),
misc_index(0),
- misc_max(0)
+ misc_max(0),
+ yield_data(NULL)
{
ASSERT(act);
act->set_node(this);
int currtid = id_to_int(act->get_tid());
int prevtid = prevfairness ? id_to_int(prevfairness->action->get_tid()) : 0;
- if (model->params.fairwindow != 0) {
+ if (get_params()->fairwindow != 0) {
for (int i = 0; i < num_threads; i++) {
ASSERT(i < ((int)fairness.size()));
struct fairness_info *fi = &fairness[i];
* conditions
* If we meet the enabled count and have no
* turns, give us priority */
- if ((fi->enabled_count >= model->params.enabledcount) &&
+ if ((fi->enabled_count >= get_params()->enabledcount) &&
(fi->turns == 0))
fi->priority = true;
}
}
}
+int Node::get_yield_data(int tid1, int tid2) const {
+ if (tid1<num_threads && tid2 < num_threads)
+ return yield_data[YIELD_INDEX(tid1,tid2,num_threads)];
+ else
+ return YIELD_S | YIELD_D;
+}
+
+void Node::update_yield(Scheduler * scheduler) {
+ if (yield_data==NULL)
+ yield_data=(int *) model_calloc(1, sizeof(int)*num_threads*num_threads);
+ //handle base case
+ if (parent == NULL) {
+ for(int i = 0; i < num_threads*num_threads; i++) {
+ yield_data[i] = YIELD_S | YIELD_D;
+ }
+ return;
+ }
+ int curr_tid=id_to_int(action->get_tid());
+
+ for(int u = 0; u < num_threads; u++) {
+ for(int v = 0; v < num_threads; v++) {
+ int yield_state=parent->get_yield_data(u, v);
+ bool next_enabled=scheduler->is_enabled(int_to_id(v));
+ bool curr_enabled=parent->is_enabled(int_to_id(v));
+ if (!next_enabled) {
+ //Compute intersection of ES and E
+ yield_state&=~YIELD_E;
+ //Check to see if we disabled the thread
+ if (u==curr_tid && curr_enabled)
+ yield_state|=YIELD_D;
+ }
+ yield_data[YIELD_INDEX(u, v, num_threads)]=yield_state;
+ }
+ yield_data[YIELD_INDEX(u, curr_tid, num_threads)]=(yield_data[YIELD_INDEX(u, curr_tid, num_threads)]&~YIELD_P)|YIELD_S;
+ }
+ //handle curr.yield(t) part of computation
+ if (action->is_yield()) {
+ for(int v = 0; v < num_threads; v++) {
+ int yield_state=yield_data[YIELD_INDEX(curr_tid, v, num_threads)];
+ if ((yield_state & (YIELD_E | YIELD_D)) && (!(yield_state & YIELD_S)))
+ yield_state |= YIELD_P;
+ yield_state &= YIELD_P;
+ if (scheduler->is_enabled(int_to_id(v))) {
+ yield_state|=YIELD_E;
+ }
+ yield_data[YIELD_INDEX(curr_tid, v, num_threads)]=yield_state;
+ }
+ }
+}
+
/** @brief Node desctructor */
Node::~Node()
{
delete action;
+ if (uninit_action)
+ delete uninit_action;
if (enabled_array)
model_free(enabled_array);
+ if (yield_data)
+ model_free(yield_data);
}
/** Prints debugging info for the ModelAction associated with this Node */
void Node::print() const
{
action->print();
+ model_print(" thread status: ");
+ if (enabled_array) {
+ for (int i = 0; i < num_threads; i++) {
+ char str[20];
+ enabled_type_to_string(enabled_array[i], str);
+ model_print("[%d: %s]", i, str);
+ }
+ model_print("\n");
+ } else
+ model_print("(info not available)\n");
model_print(" backtrack: %s", backtrack_empty() ? "empty" : "non-empty ");
for (int i = 0; i < (int)backtrack.size(); i++)
if (backtrack[i] == true)
model_print(" rel seq break: %s\n", relseq_break_empty() ? "empty" : "non-empty");
}
-/*********************************** promise **********************************/
-
-/**
- * Sets a promise to explore meeting with the given node.
- * @param i is the promise index.
- */
-void Node::set_promise(unsigned int i)
-{
- if (i >= resolve_promise.size())
- resolve_promise.resize(i + 1, false);
- resolve_promise[i] = true;
-}
-
-/**
- * Looks up whether a given promise should be satisfied by this node.
- * @param i The promise index.
- * @return true if the promise should be satisfied by the given ModelAction.
- */
-bool Node::get_promise(unsigned int i) const
-{
- return (i < resolve_promise.size()) && (int)i == resolve_promise_idx;
-}
-
-/**
- * Increments to the next promise to resolve.
- * @return true if we have a valid combination.
- */
-bool Node::increment_promise()
-{
- DBG();
- if (resolve_promise.empty())
- return false;
- int prev_idx = resolve_promise_idx;
- resolve_promise_idx++;
- for ( ; resolve_promise_idx < (int)resolve_promise.size(); resolve_promise_idx++)
- if (resolve_promise[resolve_promise_idx])
- return true;
- resolve_promise_idx = prev_idx;
- return false;
-}
-
-/**
- * Returns whether the promise set is empty.
- * @return true if we have explored all promise combinations.
- */
-bool Node::promise_empty() const
-{
- for (int i = resolve_promise_idx + 1; i < (int)resolve_promise.size(); i++)
- if (i >= 0 && resolve_promise[i])
- return false;
- return true;
-}
-
-/** @brief Clear any promise-resolution information for this Node */
-void Node::clear_promise_resolutions()
-{
- resolve_promise.clear();
- resolve_promise_idx = -1;
-}
-
-/******************************* end promise **********************************/
-
-void Node::set_misc_max(int i)
-{
- misc_max = i;
-}
-
-int Node::get_misc() const
-{
- return misc_index;
-}
-
-bool Node::increment_misc()
-{
- return (misc_index < misc_max) && ((++misc_index) < misc_max);
-}
-
-bool Node::misc_empty() const
-{
- return (misc_index + 1) >= misc_max;
-}
+/****************************** threads backtracking **************************/
/**
* Checks if the Thread associated with this thread ID has been explored from
return (numBacktracks == 0);
}
+void Node::explore(thread_id_t tid)
+{
+ int i = id_to_int(tid);
+ ASSERT(i < ((int)backtrack.size()));
+ if (backtrack[i]) {
+ backtrack[i] = false;
+ numBacktracks--;
+ }
+ explored_children[i] = true;
+}
+
/**
* Mark the appropriate backtracking information for exploring a thread choice.
* @param act The ModelAction to explore
backtrack[i] = false;
for (unsigned int i = 0; i < explored_children.size(); i++)
explored_children[i] = false;
+ numBacktracks = 0;
+}
+
+/************************** end threads backtracking **************************/
+
+/*********************************** promise **********************************/
+
+/**
+ * Sets a promise to explore meeting with the given node.
+ * @param i is the promise index.
+ */
+void Node::set_promise(unsigned int i)
+{
+ if (i >= resolve_promise.size())
+ resolve_promise.resize(i + 1, false);
+ resolve_promise[i] = true;
+}
+
+/**
+ * Looks up whether a given promise should be satisfied by this node.
+ * @param i The promise index.
+ * @return true if the promise should be satisfied by the given ModelAction.
+ */
+bool Node::get_promise(unsigned int i) const
+{
+ return (i < resolve_promise.size()) && (int)i == resolve_promise_idx;
+}
+
+/**
+ * Increments to the next promise to resolve.
+ * @return true if we have a valid combination.
+ */
+bool Node::increment_promise()
+{
+ DBG();
+ if (resolve_promise.empty())
+ return false;
+ int prev_idx = resolve_promise_idx;
+ resolve_promise_idx++;
+ for ( ; resolve_promise_idx < (int)resolve_promise.size(); resolve_promise_idx++)
+ if (resolve_promise[resolve_promise_idx])
+ return true;
+ resolve_promise_idx = prev_idx;
+ return false;
+}
+
+/**
+ * Returns whether the promise set is empty.
+ * @return true if we have explored all promise combinations.
+ */
+bool Node::promise_empty() const
+{
+ for (int i = resolve_promise_idx + 1; i < (int)resolve_promise.size(); i++)
+ if (i >= 0 && resolve_promise[i])
+ return false;
+ return true;
+}
+
+/** @brief Clear any promise-resolution information for this Node */
+void Node::clear_promise_resolutions()
+{
+ resolve_promise.clear();
+ resolve_promise_idx = -1;
+}
+
+/******************************* end promise **********************************/
+
+void Node::set_misc_max(int i)
+{
+ misc_max = i;
+}
+
+int Node::get_misc() const
+{
+ return misc_index;
+}
+
+bool Node::increment_misc()
+{
+ return (misc_index < misc_max) && ((++misc_index) < misc_max);
+}
+
+bool Node::misc_empty() const
+{
+ return (misc_index + 1) >= misc_max;
}
bool Node::is_enabled(Thread *t) const
return fairness[id_to_int(tid)].priority;
}
+bool Node::has_priority_over(thread_id_t tid1, thread_id_t tid2) const
+{
+ return get_yield_data(id_to_int(tid1), id_to_int(tid2)) & YIELD_P;
+}
+
/*********************************** read from ********************************/
/**
* where this->action is a 'read'.
* @return The current element in read_from_promises
*/
-const Promise * Node::get_read_from_promise() const
+Promise * Node::get_read_from_promise() const
{
- if (read_from_promise_idx < 0 || read_from_promise_idx >= ((int)read_from_promises.size()))
- return NULL;
+ ASSERT(read_from_promise_idx >= 0 && read_from_promise_idx < ((int)read_from_promises.size()));
return read_from_promises[read_from_promise_idx]->get_reads_from_promise();
}
+/**
+ * Gets a particular 'read-from-promise' form this Node. Only vlaid for a node
+ * where this->action is a 'read'.
+ * @param i The index of the Promise to get
+ * @return The Promise at index i, if the Promise is still available; NULL
+ * otherwise
+ */
+Promise * Node::get_read_from_promise(int i) const
+{
+ return read_from_promises[i]->get_reads_from_promise();
+}
+
+/** @return The size of the read-from-promise set */
+int Node::get_read_from_promise_size() const
+{
+ return read_from_promises.size();
+}
+
/**
* Checks whether the read_from_promises set for this node is empty.
* @return true if the read_from_promises set is empty.
/* Future value hasn't been explored; update expiration */
future_values[idx].expiration = expiration;
return true;
- } else if (idx >= 0 && expiration <= future_values[idx].expiration + model->params.expireslop) {
+ } else if (idx >= 0 && expiration <= future_values[idx].expiration + get_params()->expireslop) {
/* Future value has been explored and is within the "sloppy" window */
return false;
}
/* Limit the size of the future-values set */
- if (model->params.maxfuturevalues > 0 &&
- (int)future_values.size() >= model->params.maxfuturevalues)
+ if (get_params()->maxfuturevalues > 0 &&
+ (int)future_values.size() >= get_params()->maxfuturevalues)
return false;
future_values.push_back(fv);
/************************** end future values *********************************/
+/*********************** breaking release sequences ***************************/
+
/**
* Add a write ModelAction to the set of writes that may break the release
* sequence. This is used during replay exploration of pending release
return ((relseq_break_index + 1) >= ((int)relseq_break_writes.size()));
}
-void Node::explore(thread_id_t tid)
+/******************* end breaking release sequences ***************************/
+
+/**
+ * Increments some behavior's index, if a new behavior is available
+ * @return True if there is a new behavior available; otherwise false
+ */
+bool Node::increment_behaviors()
{
- int i = id_to_int(tid);
- ASSERT(i < ((int)backtrack.size()));
- if (backtrack[i]) {
- backtrack[i] = false;
- numBacktracks--;
- }
- explored_children[i] = true;
+ /* satisfy a different misc_index values */
+ if (increment_misc())
+ return true;
+ /* satisfy a different set of promises */
+ if (increment_promise())
+ return true;
+ /* read from a different value */
+ if (increment_read_from())
+ return true;
+ /* resolve a release sequence differently */
+ if (increment_relseq_break())
+ return true;
+ return false;
}
NodeStack::NodeStack() :
delete node_list[i];
}
+/**
+ * @brief Register the model-checker object with this NodeStack
+ * @param exec The execution structure for the ModelChecker
+ */
+void NodeStack::register_engine(const ModelExecution *exec)
+{
+ this->execution = exec;
+}
+
+const struct model_params * NodeStack::get_params() const
+{
+ return execution->get_params();
+}
+
void NodeStack::print() const
{
model_print("............................................\n");
Node *prevfairness = NULL;
if (head) {
head->explore_child(act, is_enabled);
- if (model->params.fairwindow != 0 && head_idx > (int)model->params.fairwindow)
- prevfairness = node_list[head_idx - model->params.fairwindow];
+ if (get_params()->fairwindow != 0 && head_idx > (int)get_params()->fairwindow)
+ prevfairness = node_list[head_idx - get_params()->fairwindow];
}
- int next_threads = model->get_num_threads();
+ int next_threads = execution->get_num_threads();
if (act->get_type() == THREAD_CREATE)
next_threads++;
- node_list.push_back(new Node(act, head, next_threads, prevfairness));
+ node_list.push_back(new Node(get_params(), act, head, next_threads, prevfairness));
total_nodes++;
head_idx++;
return NULL;
node_list.back()->clear_backtracking();
}
+/** Reset the node stack. */
+void NodeStack::full_reset()
+{
+ for (unsigned int i = 0; i < node_list.size(); i++)
+ delete node_list[i];
+ node_list.clear();
+ reset_execution();
+ total_nodes = 1;
+}
+
Node * NodeStack::get_head() const
{
if (node_list.empty() || head_idx < 0)
projects / model-checker.git / blobdiff