X-Git-Url: http://plrg.eecs.uci.edu/git/?p=model-checker.git;a=blobdiff_plain;f=model.h;h=d5dc42266769004d542d72f472f6e1029c1a7e5c;hp=74e3b068c39f356570daf491c3715865a1382d38;hb=2c830a91c32a55de67c21e03f36529f994d9139d;hpb=3c82af9a449b5cb3322809fd195a02e4a2ae37f4 diff --git a/model.h b/model.h index 74e3b06..d5dc422 100644 --- a/model.h +++ b/model.h @@ -10,24 +10,62 @@ #include #include -#include "schedule.h" #include "mymemory.h" -#include "libthreads.h" -#include "threads.h" #include "action.h" -#include "clockvector.h" #include "hashtable.h" +#include "workqueue.h" +#include "config.h" +#include "modeltypes.h" /* Forward declaration */ class NodeStack; class CycleGraph; class Promise; +class Scheduler; +class Thread; + +/** @brief Shorthand for a list of release sequence heads */ +typedef std::vector< const ModelAction *, ModelAlloc > 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; +}; + +struct PendingFutureValue { + uint64_t value; + modelclock_t expiration; + ModelAction * act; +}; + +/** + * Structure for holding small ModelChecker members that should be snapshotted + */ +struct model_snapshot_members { + ModelAction *current_action; + unsigned int next_thread_id; + modelclock_t used_sequence_numbers; + Thread *nextThread; + ModelAction *next_backtrack; +}; + +/** @brief Records information regarding a single pending release sequence */ +struct release_seq { + /** @brief The acquire operation */ + ModelAction *acquire; + /** @brief The head of the RMW chain from which 'acquire' reads; may be + * equal to 'release' */ + const ModelAction *rf; + /** @brief The head of the potential longest release sequence chain */ + const ModelAction *release; + /** @brief The write(s) that may break the release sequence */ + std::vector writes; }; /** @brief The central structure for model-checking */ @@ -41,44 +79,53 @@ public: /** Prints an execution summary with trace information. */ void print_summary(); +#if SUPPORT_MOD_ORDER_DUMP + void dumpGraph(char *filename); +#endif void add_thread(Thread *t); void remove_thread(Thread *t); - Thread * get_thread(thread_id_t tid) { return thread_map->get(id_to_int(tid)); } + Thread * get_thread(thread_id_t tid) const; + Thread * get_thread(ModelAction *act) const; thread_id_t get_next_id(); - int get_num_threads(); - modelclock_t get_next_seq_num(); - - /** @return The currently executing Thread. */ - Thread * get_current_thread() { return scheduler->get_current_thread(); } + unsigned int get_num_threads(); + Thread * 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, - std::vector *release_heads); - + void mo_check_promises(thread_id_t tid, const ModelAction *write); + void check_promises(thread_id_t tid, 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;} + /** @brief Alert the model-checker that an incorrectly-ordered + * synchronization was made */ + void set_bad_synchronization() { bad_synchronization = true; } + + const model_params params; + Scheduler * get_scheduler() { return scheduler;} + MEMALLOC private: /** 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 next_thread_id; - modelclock_t used_sequence_numbers; int num_executions; + int num_feasible_executions; + bool promises_expired(); - const model_params params; + modelclock_t get_next_seq_num(); /** * Stores the ModelAction for the current thread action. Call this @@ -86,34 +133,42 @@ private: * data between them. * @param act The ModelAction created by the user-thread action */ - void set_current_action(ModelAction *act) { current_action = act; } + 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); + bool process_mutex(ModelAction *curr); + bool process_thread_action(ModelAction *curr); + bool check_action_enabled(ModelAction *curr); bool take_step(); + void check_recency(ModelAction *curr, const ModelAction *rf); ModelAction * get_last_conflict(ModelAction *act); void set_backtracking(ModelAction *act); - Thread * get_next_replay_thread(); + 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); - ModelAction * get_last_seq_cst(const void *location); + 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, - std::vector *release_heads) const; - bool resolve_release_sequences(void *location); + bool release_seq_heads(const ModelAction *rf, rel_heads_list_t *release_heads, struct release_seq *pending) const; + bool resolve_release_sequences(void *location, work_queue_t *work_queue); + void do_complete_join(ModelAction *join); - ModelAction *current_action; ModelAction *diverge; - Thread *nextThread; + ModelAction *earliest_diverge; ucontext_t system_context; action_list_t *action_trace; @@ -123,21 +178,28 @@ private: * to a trace of all actions performed on the object. */ HashTable *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 *lock_waiters_map; + HashTable, uintptr_t, 4 > *obj_thrd_map; std::vector *promises; + std::vector *futurevalues; /** - * 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. + * List of pending release sequences. Release sequences might be + * determined lazily as promises are fulfilled and modification orders + * are established. Each entry in the list may only be partially + * filled, depending on its pending status. */ - HashTable, uintptr_t, 4> *lazy_sync_with_release; + std::vector *pending_rel_seqs; std::vector *thrd_last_action; NodeStack *node_stack; - ModelAction *next_backtrack; + + /** 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 @@ -155,7 +217,10 @@ private: */ CycleGraph *mo_graph; bool failed_promise; + bool too_many_reads; bool asserted; + /** @brief Incorrectly-ordered synchronization was made */ + bool bad_synchronization; }; extern ModelChecker *model;