#include <cstddef>
#include <ucontext.h>
-#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;
+struct model_snapshot_members;
+
+/** @brief Shorthand for a list of release sequence heads */
+typedef std::vector< const ModelAction *, ModelAlloc<const ModelAction *> > rel_heads_list_t;
/**
* Model checker parameter structure. Holds run-time configuration options for
struct model_params {
int maxreads;
int maxfuturedelay;
+ unsigned int fairwindow;
+ unsigned int enabledcount;
+ unsigned int bound;
+
+ /** @brief Maximum number of future values that can be sent to the same
+ * read */
+ int maxfuturevalues;
+
+ /** @brief Only generate a new future value/expiration pair if the
+ * expiration time exceeds the existing one by more than the slop
+ * value */
+ unsigned int expireslop;
+
+ /** @brief Verbosity (0 = quiet; 1 = noisy) */
+ int verbose;
+};
+
+/** @brief Model checker execution stats */
+struct execution_stats {
+ int num_total; /**< @brief Total number of executions */
+ int num_infeasible; /**< @brief Number of infeasible executions */
+ int num_buggy_executions; /** @brief Number of buggy executions */
+ int num_complete; /**< @brief Number of feasible, non-buggy, complete executions */
+ int num_redundant; /**< @brief Number of redundant, aborted executions */
};
struct PendingFutureValue {
- uint64_t value;
- modelclock_t expiration;
- ModelAction * act;
+ ModelAction *writer;
+ ModelAction *act;
};
-/**
- * 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;
-
- /** @see ModelChecker::lazy_sync_size */
- unsigned int lazy_sync_size;
+/** @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<const ModelAction *> writes;
};
/** @brief The central structure for model-checking */
/** @returns the context for the main model-checking system thread */
ucontext_t * get_system_context() { return &system_context; }
- /** Prints an execution summary with trace information. */
- void print_summary();
+ void print_summary() const;
+#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(ModelAction *act) { return get_thread(act->get_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();
+ bool is_enabled(Thread *t) const;
+ bool is_enabled(thread_id_t tid) const;
- /** @return The currently executing Thread. */
- Thread * get_current_thread() { return scheduler->get_current_thread(); }
+ thread_id_t get_next_id();
+ unsigned int get_num_threads() const;
+ 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< const ModelAction *, MyAlloc<const ModelAction *> > *release_heads);
+ bool isfeasible() const;
+ bool isfeasibleotherthanRMW() const;
+ bool isfinalfeasible() const;
+ void check_promises_thread_disabled();
+ 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();
+ bool isfeasibleprefix() const;
+
+ bool assert_bug(const char *msg);
+ void assert_user_bug(const char *msg);
+
void set_assert() {asserted=true;}
+ bool is_deadlocked() const;
+ bool is_complete_execution() const;
+ void print_stats() const;
+
+ /** @brief Alert the model-checker that an incorrectly-ordered
+ * synchronization was made */
+ void set_bad_synchronization() { bad_synchronization = true; }
+
+ const model_params params;
+ Node * get_curr_node();
MEMALLOC
private:
/** The scheduler to use: tracks the running/ready Threads */
Scheduler *scheduler;
+ bool sleep_can_read_from(ModelAction * curr, const ModelAction *write);
bool thin_air_constraint_may_allow(const ModelAction * writer, const ModelAction *reader);
+ bool mo_may_allow(const ModelAction * writer, const ModelAction *reader);
bool has_asserted() {return asserted;}
void reset_asserted() {asserted=false;}
- int num_executions;
- bool promises_expired();
- const model_params params;
+ bool promises_expired() const;
+ void execute_sleep_set();
+ void wake_up_sleeping_actions(ModelAction * curr);
+ modelclock_t get_next_seq_num();
- /**
- * 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; }
+ void set_current_action(ModelAction *act);
Thread * check_current_action(ModelAction *curr);
- bool process_read(ModelAction *curr, Thread * th, bool second_part_of_rmw);
+ bool 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);
+ void process_relseq_fixup(ModelAction *curr, work_queue_t *work_queue);
+ bool check_action_enabled(ModelAction *curr);
bool take_step();
- void check_recency(ModelAction *curr, bool already_added);
+ void check_recency(ModelAction *curr, const ModelAction *rf);
ModelAction * get_last_conflict(ModelAction *act);
void set_backtracking(ModelAction *act);
Thread * get_next_thread(ModelAction *curr);
void reset_to_initial_state();
bool resolve_promises(ModelAction *curr);
void compute_promises(ModelAction *curr);
+ void compute_relseq_breakwrites(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< const ModelAction *, MyAlloc<const ModelAction *> > *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);
ModelAction *diverge;
+ ModelAction *earliest_diverge;
ucontext_t system_context;
action_list_t *action_trace;
/** 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<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;
- std::vector<struct PendingFutureValue> *futurevalues;
+ /** 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;
- /**
- * 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;
+ /** 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> *condvar_waiters_map;
+
+ HashTable<void *, std::vector<action_list_t> *, uintptr_t, 4 > *obj_thrd_map;
+ std::vector< Promise *, SnapshotAlloc<Promise *> > *promises;
+ std::vector< struct PendingFutureValue, SnapshotAlloc<struct PendingFutureValue> > *futurevalues;
/**
- * Represents the total size of the
- * ModelChecker::lazy_sync_with_release lists. This count should be
- * snapshotted, so it is actually a pointer to a location within
- * ModelChecker::priv
+ * 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.
*/
- unsigned int *lazy_sync_size;
+ std::vector< struct release_seq *, SnapshotAlloc<struct release_seq *> > *pending_rel_seqs;
- std::vector<ModelAction *> *thrd_last_action;
+ std::vector< ModelAction *, SnapshotAlloc<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;
+ /** A special model-checker Thread; used for associating with
+ * model-checker-related ModelAcitons */
+ Thread *model_thread;
+
/**
* @brief The modification order graph
*
bool failed_promise;
bool too_many_reads;
bool asserted;
+ /** @brief Incorrectly-ordered synchronization was made */
+ bool bad_synchronization;
+
+ /** @brief The cumulative execution stats */
+ struct execution_stats stats;
+ void record_stats();
+
+ bool have_bug_reports() const;
+ void print_bugs() const;
+ void print_execution(bool printbugs) const;
};
extern ModelChecker *model;
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