+/** @file nodestack.h
+ * @brief Stack of operations for use in backtracking.
+ */
+
#ifndef __NODESTACK_H__
#define __NODESTACK_H__
-#include <list>
-#include <vector>
#include <cstddef>
-#include "threads.h"
+#include <inttypes.h>
-class ModelAction;
+#include "mymemory.h"
+#include "schedule.h"
+#include "stl-model.h"
+#include "classlist.h"
+/**
+ * @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, Node *parent = NULL);
+ Node(ModelAction *act);
~Node();
- /* return true = thread choice has already been explored */
- bool has_been_explored(thread_id_t tid);
- /* return true = backtrack set is empty */
- bool backtrack_empty();
- void explore_child(ModelAction *act);
- /* return false = thread was already in backtrack */
- bool set_backtrack(thread_id_t id);
- thread_id_t get_next_backtrack();
- bool is_enabled(Thread *t);
- ModelAction * get_action() { return action; }
-
- void print();
-
- static int get_total_nodes() { return total_nodes; }
+
+ ModelAction * get_action() const { return action; }
+ void set_uninit_action(ModelAction *act) { uninit_action = act; }
+ ModelAction * get_uninit_action() const { return uninit_action; }
+ void print() const;
+
+ SNAPSHOTALLOC
private:
- void explore(thread_id_t tid);
+ ModelAction * const action;
- static int total_nodes;
- ModelAction *action;
- int num_threads;
- std::vector<bool> explored_children;
- std::vector<bool> backtrack;
+ /** @brief ATOMIC_UNINIT action which was created at this Node */
+ ModelAction *uninit_action;
};
-typedef std::list<class Node *> node_list_t;
+typedef SnapVector<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();
~NodeStack();
- ModelAction * explore_action(ModelAction *act);
- Node * get_head();
- Node * get_next();
+
+ void register_engine(const ModelExecution *exec);
+ void add_action(ModelAction *act);
+ Node * get_head() const;
+ Node * get_next() const;
void reset_execution();
+ void full_reset();
+ void print() const;
- void print();
+ SNAPSHOTALLOC
private:
node_list_t node_list;
- node_list_t::iterator iter;
+ const struct model_params * get_params() const;
+
+ /** @brief The model-checker execution object */
+ const ModelExecution *execution;
+
+ /**
+ * @brief the index position of the current head Node
+ *
+ * This index is relative to node_list. The index should point to the
+ * current head Node. It is negative when the list is empty.
+ */
+ int head_idx;
};
-#endif /* __NODESTACK_H__ */
+#endif /* __NODESTACK_H__ */