class ModelAction;
+typedef std::list< const ModelAction *, MyAlloc< const ModelAction * > > readfrom_set_t;
+
+/**
+ * @brief A single node in a NodeStack
+ *
+ * Represents a single node in the NodeStack. Each Node is associated with up
+ * to one action and up to one parent node. A node holds information
+ * regarding the last action performed (the "associated action"), the thread
+ * choices that have been explored (explored_children) and should be explored
+ * (backtrack), and the actions that the last action may read from.
+ */
class Node {
public:
- Node(ModelAction *act = NULL, int nthreads = 1);
+ Node(ModelAction *act = NULL, Node *par = NULL, int nthreads = 1);
~Node();
/* return true = thread choice has already been explored */
bool has_been_explored(thread_id_t tid);
bool is_enabled(Thread *t);
ModelAction * get_action() { return action; }
+ /** @return the parent Node to this Node; that is, the action that
+ * occurred previously in the stack. */
+ Node * get_parent() const { return parent; }
+
+ void add_read_from(const ModelAction *act);
+
void print();
+ void print_may_read_from();
MEMALLOC
private:
void explore(thread_id_t tid);
ModelAction *action;
+ Node *parent;
int num_threads;
std::vector< bool, MyAlloc<bool> > explored_children;
std::vector< bool, MyAlloc<bool> > backtrack;
+ int numBacktracks;
+
+ /** The set of ModelActions that this the action at this Node may read
+ * from. Only meaningful if this Node represents a 'read' action. */
+ readfrom_set_t may_read_from;
};
-typedef std::list<class Node *, MyAlloc< class Node * > > node_list_t;
+typedef std::list< Node *, MyAlloc< Node * > > node_list_t;
+/**
+ * @brief A stack of nodes
+ *
+ * Holds a Node linked-list that can be used for holding backtracking,
+ * may-read-from, and replay information. It is used primarily as a
+ * stack-like structure, in that backtracking points and replay nodes are
+ * only removed from the top (most recent).
+ */
class NodeStack {
public:
NodeStack();