/** @file model.h
- * @brief Core model checker.
+ * @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 <utility>
#include "libthreads.h"
-#include "libatomic.h"
#include "threads.h"
#include "action.h"
+#include "clockvector.h"
+#include "hashtable.h"
/* Forward declaration */
class NodeStack;
+class CycleGraph;
+class Promise;
+
+/**
+ * Model checker parameter structure. Holds run-time configuration options for
+ * the model checker.
+ */
+struct model_params {
+};
/** @brief The central structure for model-checking */
class ModelChecker {
public:
- ModelChecker();
+ ModelChecker(struct model_params params);
~ModelChecker();
- /** The scheduler to use: tracks the running/ready Threads */
- class Scheduler *scheduler;
-
- /** Stores the context for the main model-checking system thread (call
- * once)
- * @param ctxt The system context structure
- */
- void set_system_context(ucontext_t *ctxt) { system_context = ctxt; }
-
/** @returns the context for the main model-checking system thread */
- ucontext_t * get_system_context(void) { return system_context; }
+ ucontext_t * get_system_context() { return &system_context; }
- /**
- * 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) { 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)[id_to_int(tid)]; }
+ Thread * get_thread(thread_id_t tid) { return thread_map->get(id_to_int(tid)); }
thread_id_t get_next_id();
int get_num_threads();
- int get_next_seq_num();
+ 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 isfinalfeasible();
+ void check_promises(ClockVector *old_cv, ClockVector * merge_cv);
+ void get_release_seq_heads(ModelAction *act,
+ std::vector<const ModelAction *> *release_heads);
+
+ void finish_execution();
+ bool isfeasibleprefix();
+ void set_assert() {asserted=true;}
MEMALLOC
private:
+ /** The scheduler to use: tracks the running/ready Threads */
+ Scheduler *scheduler;
+
+ bool has_asserted() {return asserted;}
+ void reset_asserted() {asserted=false;}
int next_thread_id;
- int used_sequence_numbers;
+ modelclock_t used_sequence_numbers;
int num_executions;
+ const model_params params;
+
+ /**
+ * 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) { current_action = act; }
+ Thread * check_current_action(ModelAction *curr);
+
+ bool take_step();
+
ModelAction * get_last_conflict(ModelAction *act);
void set_backtracking(ModelAction *act);
- thread_id_t get_next_replay_thread();
+ Thread * get_next_replay_thread();
ModelAction * get_next_backtrack();
void reset_to_initial_state();
+ bool resolve_promises(ModelAction *curr);
+ void compute_promises(ModelAction *curr);
void add_action_to_lists(ModelAction *act);
ModelAction * get_last_action(thread_id_t tid);
- ModelAction * get_parent_action(thread_id_t tid);
+ ModelAction * get_last_seq_cst(const void *location);
void build_reads_from_past(ModelAction *curr);
-
- void print_list(action_list_t *list);
+ 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,
+ std::vector<const ModelAction *> *release_heads) const;
+ bool resolve_release_sequences(void *location);
ModelAction *current_action;
ModelAction *diverge;
- thread_id_t nextThread;
+ Thread *nextThread;
- ucontext_t *system_context;
+ ucontext_t system_context;
action_list_t *action_trace;
- std::map<int, class Thread *> *thread_map;
- std::map<void *, std::vector<action_list_t> > *obj_thrd_map;
+ 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;
+
+ HashTable<void *, std::vector<action_list_t>, uintptr_t, 4 > *obj_thrd_map;
+ std::vector<Promise *> *promises;
+
+ /**
+ * Collection of lists of objects that might synchronize with one or
+ * more release sequence. Release sequences might be determined lazily
+ * as promises are fulfilled and modification orders are established.
+ * This structure maps its lists by object location. Each ModelAction
+ * in the lists should be an acquire operation.
+ */
+ HashTable<void *, std::list<ModelAction *>, uintptr_t, 4> *lazy_sync_with_release;
+
std::vector<ModelAction *> *thrd_last_action;
- class NodeStack *node_stack;
+ NodeStack *node_stack;
ModelAction *next_backtrack;
+
+ /**
+ * @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 asserted;
};
extern ModelChecker *model;
projects / model-checker.git / blobdiff