X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=model.h;h=fa11cb8cbbf5f0e5ed3f3ffa727b6ac9aea8ce66;hb=20d006a8c581117c6636e835cdbe36dac5d6ef93;hp=aac968a9f14077ca17953f934c82881266dc781b;hpb=cfbd2bd9b7c20f27d474142f56ad49d6b7bd0a4a;p=model-checker.git

diff --git a/model.h b/model.h
index aac968a..fa11cb8 100644
--- a/model.h
+++ b/model.h
@@ -1,111 +1,200 @@
+/** @file model.h
+ *  @brief Core model checker.
+ */
+
 #ifndef __MODEL_H__
 #define __MODEL_H__
 
 #include <list>
-#include <map>
+#include <vector>
 #include <cstddef>
+#include <ucontext.h>
 
 #include "schedule.h"
+#include "mymemory.h"
 #include "libthreads.h"
-#include "libatomic.h"
 #include "threads.h"
-#include "tree.h"
-
-#define VALUE_NONE -1
-
-typedef enum action_type {
-	THREAD_CREATE,
-	THREAD_YIELD,
-	THREAD_JOIN,
-	ATOMIC_READ,
-	ATOMIC_WRITE
-} action_type_t;
-
-typedef std::list<class ModelAction *> action_list_t;
-
-class ModelAction {
-public:
-	ModelAction(action_type_t type, memory_order order, void *loc, int value);
-	void print(void);
-
-	thread_id_t get_tid() { return tid; }
-	action_type get_type() { return type; }
-	memory_order get_mo() { return order; }
-	void * get_location() { return location; }
+#include "action.h"
+#include "clockvector.h"
+#include "hashtable.h"
+#include "workqueue.h"
+
+/* Forward declaration */
+class NodeStack;
+class CycleGraph;
+class Promise;
+
+/** @brief Shorthand for a list of release sequence heads */
+typedef std::vector< const ModelAction *, MyAlloc<const ModelAction *> > rel_heads_list_t;
+
+/**
+ * Model checker parameter structure. Holds run-time configuration options for
+ * the model checker.
+ */
+struct model_params {
+	int maxreads;
+	int maxfuturedelay;
+	unsigned int fairwindow;
+	unsigned int enabledcount;
+};
 
-	TreeNode * get_node() { return node; }
-	void set_node(TreeNode *n) { node = n; }
-private:
-	action_type type;
-	memory_order order;
-	void *location;
-	thread_id_t tid;
-	int value;
-	TreeNode *node;
+struct PendingFutureValue {
+	uint64_t value;
+	modelclock_t expiration;
+	ModelAction * act;
 };
 
-class Backtrack {
-public:
-	Backtrack(ModelAction *d, action_list_t *t) {
-		diverge = d;
-		actionTrace = t;
-		iter = actionTrace->begin();
-	}
-	ModelAction * get_diverge() { return diverge; }
-	action_list_t * get_trace() { return actionTrace; }
-	void advance_state() { iter++; }
-	ModelAction * get_state() {
-		return iter == actionTrace->end() ? NULL : *iter;
-	}
-private:
-	ModelAction *diverge;
-	action_list_t *actionTrace;
-	/* points to position in actionTrace as we replay */
-	action_list_t::iterator iter;
+/**
+ * Structure for holding small ModelChecker members that should be snapshotted
+ */
+struct model_snapshot_members {
+	ModelAction *current_action;
+	int next_thread_id;
+	modelclock_t used_sequence_numbers;
+	Thread *nextThread;
+	ModelAction *next_backtrack;
 };
 
+/** @brief The central structure for model-checking */
 class ModelChecker {
 public:
-	ModelChecker();
+	ModelChecker(struct model_params params);
 	~ModelChecker();
-	class Scheduler *scheduler;
-	Thread *system_thread;
 
-	void add_system_thread(Thread *t);
+	/** @returns the context for the main model-checking system thread */
+	ucontext_t * get_system_context() { return &system_context; }
 
-	void set_current_action(ModelAction *act) { current_action = act; }
-	void check_current_action(void);
-	void print_summary(void);
-	Thread * schedule_next_thread();
+	/** Prints an execution summary with trace information. */
+	void print_summary();
 
-	int add_thread(Thread *t);
+	void add_thread(Thread *t);
 	void remove_thread(Thread *t);
-	Thread * get_thread(thread_id_t tid) { return thread_map[tid]; }
+	Thread * get_thread(thread_id_t tid) { return thread_map->get(id_to_int(tid)); }
+	Thread * get_thread(ModelAction *act) { return get_thread(act->get_tid()); }
 
-	int get_next_id();
+	thread_id_t get_next_id();
+	int get_num_threads();
+	modelclock_t get_next_seq_num();
 
-	int switch_to_master(ModelAction *act);
+	/** @return The currently executing Thread. */
+	Thread * get_current_thread() { return scheduler->get_current_thread(); }
 
+	int switch_to_master(ModelAction *act);
+	ClockVector * get_cv(thread_id_t tid);
+	ModelAction * get_parent_action(thread_id_t tid);
 	bool next_execution();
+	bool isfeasible();
+	bool isfeasibleotherthanRMW();
+	bool isfinalfeasible();
+	void check_promises(ClockVector *old_cv, ClockVector * merge_cv);
+	void get_release_seq_heads(ModelAction *act, rel_heads_list_t *release_heads);
+	void finish_execution();
+	bool isfeasibleprefix();
+	void set_assert() {asserted=true;}
+	const model_params params;
+
+	MEMALLOC
 private:
-	int used_thread_id;
-	int num_executions;
+	/** The scheduler to use: tracks the running/ready Threads */
+	Scheduler *scheduler;
 
+	bool thin_air_constraint_may_allow(const ModelAction * writer, const ModelAction *reader);
+	bool has_asserted() {return asserted;}
+	void reset_asserted() {asserted=false;}
+	int num_executions;
+	int num_feasible_executions;
+	bool promises_expired();
+
+	/**
+	 * Stores the ModelAction for the current thread action.  Call this
+	 * immediately before switching from user- to system-context to pass
+	 * data between them.
+	 * @param act The ModelAction created by the user-thread action
+	 */
+	void set_current_action(ModelAction *act) { priv->current_action = act; }
+	Thread * check_current_action(ModelAction *curr);
+	ModelAction * initialize_curr_action(ModelAction *curr);
+	bool process_read(ModelAction *curr, bool second_part_of_rmw);
+	bool process_write(ModelAction *curr);
+	void process_mutex(ModelAction *curr);
+	bool check_action_enabled(ModelAction *curr);
+
+	bool take_step();
+
+	void check_recency(ModelAction *curr);
 	ModelAction * get_last_conflict(ModelAction *act);
 	void set_backtracking(ModelAction *act);
-	thread_id_t advance_backtracking_state();
-	thread_id_t get_next_replay_thread();
-	Backtrack * get_next_backtrack();
+	Thread * get_next_thread(ModelAction *curr);
+	ModelAction * get_next_backtrack();
 	void reset_to_initial_state();
+	bool resolve_promises(ModelAction *curr);
+	void compute_promises(ModelAction *curr);
+
+	void check_curr_backtracking(ModelAction * curr);
+	void add_action_to_lists(ModelAction *act);
+	ModelAction * get_last_action(thread_id_t tid) const;
+	ModelAction * get_last_seq_cst(ModelAction *curr) const;
+	ModelAction * get_last_unlock(ModelAction *curr) const;
+	void build_reads_from_past(ModelAction *curr);
+	ModelAction * process_rmw(ModelAction *curr);
+	void post_r_modification_order(ModelAction *curr, const ModelAction *rf);
+	bool r_modification_order(ModelAction *curr, const ModelAction *rf);
+	bool w_modification_order(ModelAction *curr);
+	bool release_seq_head(const ModelAction *rf, rel_heads_list_t *release_heads) const;
+	bool resolve_release_sequences(void *location, work_queue_t *work_queue);
+	void do_complete_join(ModelAction *join);
 
-	class ModelAction *current_action;
-	Backtrack *exploring;
-	thread_id_t nextThread;
+	ModelAction *diverge;
 
+	ucontext_t system_context;
 	action_list_t *action_trace;
-	std::map<thread_id_t, class Thread *> thread_map;
-	class TreeNode *rootNode, *currentNode;
-	std::list<class Backtrack *> backtrack_list;
+	HashTable<int, Thread *, int> *thread_map;
+
+	/** Per-object list of actions. Maps an object (i.e., memory location)
+	 * to a trace of all actions performed on the object. */
+	HashTable<const void *, action_list_t, uintptr_t, 4> *obj_map;
+
+	/** Per-object list of actions. Maps an object (i.e., memory location)
+	 * to a trace of all actions performed on the object. */
+	HashTable<const void *, action_list_t, uintptr_t, 4> *lock_waiters_map;
+
+	HashTable<void *, std::vector<action_list_t>, uintptr_t, 4 > *obj_thrd_map;
+	std::vector<Promise *> *promises;
+	std::vector<struct PendingFutureValue> *futurevalues;
+
+	/**
+	 * List of acquire actions that might synchronize with one or more
+	 * release sequence. Release sequences might be determined lazily as
+	 * promises are fulfilled and modification orders are established. Each
+	 * ModelAction in this list must be an acquire operation.
+	 */
+	std::vector<ModelAction *> *pending_acq_rel_seq;
+
+	std::vector<ModelAction *> *thrd_last_action;
+	NodeStack *node_stack;
+
+	/** Private data members that should be snapshotted. They are grouped
+	 * together for efficiency and maintainability. */
+	struct model_snapshot_members *priv;
+
+	/**
+	 * @brief The modification order graph
+	 *
+	 * A directed acyclic graph recording observations of the modification
+	 * order on all the atomic objects in the system. This graph should
+	 * never contain any cycles, as that represents a violation of the
+	 * memory model (total ordering). This graph really consists of many
+	 * disjoint (unconnected) subgraphs, each graph corresponding to a
+	 * separate ordering on a distinct object.
+	 *
+	 * The edges in this graph represent the "ordered before" relation,
+	 * such that <tt>a --> b</tt> means <tt>a</tt> was ordered before
+	 * <tt>b</tt>.
+	 */
+	CycleGraph *mo_graph;
+	bool failed_promise;
+	bool too_many_reads;
+	bool asserted;
 };
 
 extern ModelChecker *model;