#include "funcinst.h"
#include "common.h"
#include "concretepredicate.h"
+#include "waitobj.h"
#include "model.h"
#include "execution.h"
func_nodes()
{
/* The following are snapshot data structures */
- write_history = new HashTable<void *, value_set_t *, uintptr_t, 4>();
- loc_func_nodes_map = new HashTable<void *, SnapList<FuncNode *> *, uintptr_t, 0>();
- loc_wr_func_nodes_map = new HashTable<void *, SnapList<FuncNode *> *, uintptr_t, 0>();
+ write_history = new HashTable<void *, value_set_t *, uintptr_t, 0>();
+ loc_rd_func_nodes_map = new HashTable<void *, SnapVector<FuncNode *> *, uintptr_t, 0>();
+ loc_wr_func_nodes_map = new HashTable<void *, SnapVector<FuncNode *> *, uintptr_t, 0>();
loc_waiting_writes_map = new HashTable<void *, SnapVector<ConcretePredicate *> *, uintptr_t, 0>();
thrd_waiting_write = new SnapVector<ConcretePredicate *>();
- func_inst_act_maps = new HashTable<uint32_t, SnapVector<inst_act_map_t *> *, int, 0>();
+ thrd_wait_obj = new SnapVector<WaitObj *>();
+ func_inst_act_maps = new HashTable<uint32_t, SnapVector<inst_act_map_t *> *, int, 0>(128);
+}
+
+ModelHistory::~ModelHistory()
+{
+ // TODO: complete deconstructor; maybe not needed
+ for (uint i = 0; i < thrd_wait_obj->size(); i++)
+ delete (*thrd_wait_obj)[i];
}
void ModelHistory::enter_function(const uint32_t func_id, thread_id_t tid)
//model_print("thread %d entering func %d\n", tid, func_id);
ModelExecution * execution = model->get_execution();
uint id = id_to_int(tid);
+
SnapVector<func_id_list_t> * thrd_func_list = execution->get_thrd_func_list();
SnapVector< SnapList<action_list_t *> *> *
thrd_func_act_lists = execution->get_thrd_func_act_lists();
FuncNode * last_func_node = func_nodes[last_entered_func_id];
last_func_node->add_out_edge(func_node);
}
+
+ /* Monitor the statuses of threads waiting for tid */
+ monitor_waiting_thread(func_id, tid);
}
/* @param func_id a non-zero value */
void ModelHistory::process_action(ModelAction *act, thread_id_t tid)
{
ModelExecution * execution = model->get_execution();
- /* return if thread i has not entered any function or has exited
- from all functions */
SnapVector<func_id_list_t> * thrd_func_list = execution->get_thrd_func_list();
SnapVector< SnapList<action_list_t *> *> *
thrd_func_act_lists = execution->get_thrd_func_act_lists();
- uint32_t id = id_to_int(tid);
- if ( thrd_func_list->size() <= id )
+ uint32_t thread_id = id_to_int(tid);
+ /* Return if thread tid has not entered any function that contains atomics */
+ if ( thrd_func_list->size() <= thread_id )
return;
- /* get the function id that thread i is currently in */
- uint32_t func_id = (*thrd_func_list)[id].back();
- SnapList<action_list_t *> * func_act_lists = (*thrd_func_act_lists)[id];
+ /* Monitor the statuses of threads waiting for tid */
+ monitor_waiting_thread_counter(tid);
+ /* Every write action should be processed, including
+ * nonatomic writes (which have no position) */
if (act->is_write()) {
void * location = act->get_location();
uint64_t value = act->get_write_value();
update_write_history(location, value);
- /* Update FuncNodes that may read from this location */
- SnapList<FuncNode *> * func_nodes = loc_func_nodes_map->get(location);
- if (func_nodes != NULL) {
- sllnode<FuncNode *> * it = func_nodes->begin();
- for (; it != NULL; it = it->getNext()) {
- FuncNode * func_node = it->getVal();
- func_node->add_to_val_loc_map(value, location);
- }
+ /* Notify FuncNodes that may read from this location */
+ SnapVector<FuncNode *> * func_node_list = getRdFuncNodes(location);
+ for (uint i = 0; i < func_node_list->size(); i++) {
+ FuncNode * func_node = (*func_node_list)[i];
+ func_node->add_to_val_loc_map(value, location);
}
check_waiting_write(act);
}
- /* the following does not care about actions without a position */
+ uint32_t func_id = (*thrd_func_list)[thread_id].back();
+
+ /* The following does not care about actions that are not inside
+ * any function that contains atomics or actions without a position */
if (func_id == 0 || act->get_position() == NULL)
return;
- bool second_part_of_rmw = act->is_rmwc() || act->is_rmw();
+ SnapList<action_list_t *> * func_act_lists = (*thrd_func_act_lists)[thread_id];
+ /* The list of actions that thread tid has taken in its current function */
action_list_t * curr_act_list = func_act_lists->back();
- ASSERT(curr_act_list != NULL);
-
- modelclock_t curr_seq_number = act->get_seq_number();
- /* Skip actions that are second part of a read modify write or actions with the same sequence number */
- if (curr_act_list->size() != 0) {
- ModelAction * last_act = curr_act_list->back();
- if (second_part_of_rmw || last_act->get_seq_number() == curr_seq_number)
- return;
- }
- /* skip actions that are paused by fuzzer (sequence number is 0) */
- if (curr_seq_number == 0)
+ if (skip_action(act, curr_act_list))
return;
- FuncNode * func_node = func_nodes[func_id];
-
- /* add to curr_inst_list */
+ /* Add to curr_inst_list */
curr_act_list->push_back(act);
+
+ FuncNode * func_node = func_nodes[func_id];
func_node->add_inst(act);
if (act->is_read()) {
write_set->add(write_val);
}
-void ModelHistory::update_loc_func_nodes_map(void * location, FuncNode * node)
+void ModelHistory::update_loc_rd_func_nodes_map(void * location, FuncNode * node)
{
- SnapList<FuncNode *> * func_node_list = loc_func_nodes_map->get(location);
+ SnapVector<FuncNode *> * func_node_list = getRdFuncNodes(location);
+ func_node_list->push_back(node);
+}
+
+void ModelHistory::update_loc_wr_func_nodes_map(void * location, FuncNode * node)
+{
+ SnapVector<FuncNode *> * func_node_list = getWrFuncNodes(location);
+ func_node_list->push_back(node);
+}
+
+SnapVector<FuncNode *> * ModelHistory::getRdFuncNodes(void * location)
+{
+ SnapVector<FuncNode *> * func_node_list = loc_rd_func_nodes_map->get(location);
if (func_node_list == NULL) {
- func_node_list = new SnapList<FuncNode *>();
- loc_func_nodes_map->put(location, func_node_list);
+ func_node_list = new SnapVector<FuncNode *>();
+ loc_rd_func_nodes_map->put(location, func_node_list);
}
- func_node_list->push_back(node);
+ return func_node_list;
}
-void ModelHistory::update_loc_wr_func_nodes_map(void * location, FuncNode * node)
+SnapVector<FuncNode *> * ModelHistory::getWrFuncNodes(void * location)
{
- SnapList<FuncNode *> * func_node_list = loc_wr_func_nodes_map->get(location);
+ SnapVector<FuncNode *> * func_node_list = loc_wr_func_nodes_map->get(location);
if (func_node_list == NULL) {
- func_node_list = new SnapList<FuncNode *>();
- loc_func_nodes_map->put(location, func_node_list);
+ func_node_list = new SnapVector<FuncNode *>();
+ loc_wr_func_nodes_map->put(location, func_node_list);
}
- func_node_list->push_back(node);
+ return func_node_list;
}
/* When a thread is paused by Fuzzer, keep track of the condition it is waiting for */
void * location = concrete->get_location();
SnapVector<ConcretePredicate *> * concrete_preds = loc_waiting_writes_map->get(location);
+ /* Linear search should be fine because presumably not many ConcretePredicates
+ * are at the same memory location */
for (uint i = 0; i < concrete_preds->size(); i++) {
ConcretePredicate * current = (*concrete_preds)[i];
if (concrete == current) {
void * location = write_act->get_location();
uint64_t value = write_act->get_write_value();
SnapVector<ConcretePredicate *> * concrete_preds = loc_waiting_writes_map->get(location);
- SnapVector<ConcretePredicate *> to_remove = SnapVector<ConcretePredicate *>();
if (concrete_preds == NULL)
return;
}
if (satisfy_predicate) {
- to_remove.push_back(concrete_pred);
+ /* Wake up threads */
+ thread_id_t tid = concrete_pred->get_tid();
+ Thread * thread = model->get_thread(tid);
+
+ //model_print("** thread %d is woken up\n", thread->get_id());
+ model->get_execution()->getFuzzer()->notify_paused_thread(thread);
}
index++;
}
+}
+
+WaitObj * ModelHistory::getWaitObj(thread_id_t tid)
+{
+ int thread_id = id_to_int(tid);
+ int old_size = thrd_wait_obj->size();
+ if (old_size <= thread_id) {
+ thrd_wait_obj->resize(thread_id + 1);
+ for (int i = old_size; i < thread_id + 1; i++) {
+ (*thrd_wait_obj)[i] = new WaitObj( int_to_id(i) );
+ }
+ }
+
+ return (*thrd_wait_obj)[thread_id];
+}
- for (uint i = 0; i < to_remove.size(); i++) {
- ConcretePredicate * concrete_pred = to_remove[i];
+void ModelHistory::add_waiting_thread(thread_id_t self_id,
+ thread_id_t waiting_for_id, FuncNode * target_node, int dist)
+{
+ WaitObj * self_wait_obj = getWaitObj(self_id);
+ self_wait_obj->add_waiting_for(waiting_for_id, target_node, dist);
- /* Wake up threads */
- thread_id_t tid = concrete_pred->get_tid();
- Thread * thread = model->get_thread(tid);
+ /* Update waited-by relation */
+ WaitObj * other_wait_obj = getWaitObj(waiting_for_id);
+ other_wait_obj->add_waited_by(self_id);
+}
- model_print("** thread %d is woken up\n", thread->get_id());
- model->get_execution()->getFuzzer()->notify_paused_thread(thread);
+/* Thread tid is woken up (or notified), so it is not waiting for others anymore */
+void ModelHistory::remove_waiting_thread(thread_id_t tid)
+{
+ WaitObj * self_wait_obj = getWaitObj(tid);
+ thrd_id_set_t * waiting_for = self_wait_obj->getWaitingFor();
+
+ /* Remove tid from waited_by's */
+ thrd_id_set_iter * iter = waiting_for->iterator();
+ while (iter->hasNext()) {
+ thread_id_t other_id = iter->next();
+ WaitObj * other_wait_obj = getWaitObj(other_id);
+ other_wait_obj->remove_waited_by(tid);
+ }
+
+ self_wait_obj->clear_waiting_for();
+}
+
+void ModelHistory::stop_waiting_for_node(thread_id_t self_id,
+ thread_id_t waiting_for_id, FuncNode * target_node)
+{
+ WaitObj * self_wait_obj = getWaitObj(self_id);
+ bool thread_removed = self_wait_obj->remove_waiting_for_node(waiting_for_id, target_node);
+
+ // model_print("\t%d gives up %d on node %d\n", self_id, waiting_for_id, target_node->get_func_id());
+
+ /* If thread self_id is not waiting for waiting_for_id anymore */
+ if (thread_removed) {
+ WaitObj * other_wait_obj = getWaitObj(waiting_for_id);
+ other_wait_obj->remove_waited_by(self_id);
+
+ thrd_id_set_t * self_waiting_for = self_wait_obj->getWaitingFor();
+ if ( self_waiting_for->isEmpty() ) {
+ // model_print("\tthread %d waits for nobody, wake up\n", self_id);
+ ModelExecution * execution = model->get_execution();
+ Thread * thread = execution->get_thread(self_id);
+ execution->getFuzzer()->notify_paused_thread(thread);
+ }
}
}
return maps;
}
+bool ModelHistory::skip_action(ModelAction * act, SnapList<ModelAction *> * curr_act_list)
+{
+ ASSERT(curr_act_list != NULL);
+
+ bool second_part_of_rmw = act->is_rmwc() || act->is_rmw();
+ modelclock_t curr_seq_number = act->get_seq_number();
+
+ /* Skip actions that are second part of a read modify write */
+ if (second_part_of_rmw)
+ return true;
+
+ /* Skip actions with the same sequence number */
+ if (curr_act_list->size() != 0) {
+ ModelAction * last_act = curr_act_list->back();
+ if (last_act->get_seq_number() == curr_seq_number)
+ return true;
+ }
+
+ /* Skip actions that are paused by fuzzer (sequence number is 0) */
+ if (curr_seq_number == 0)
+ return true;
+
+ return false;
+}
+
+/* Monitor thread tid and decide whether other threads (that are waiting for tid)
+ * should keep waiting for this thread or not. Shall only be called when a thread
+ * enters a function.
+ *
+ * Heuristics: If the distance from the current FuncNode to some target node
+ * ever increases, stop waiting for this thread on this target node.
+ */
+void ModelHistory::monitor_waiting_thread(uint32_t func_id, thread_id_t tid)
+{
+ WaitObj * wait_obj = getWaitObj(tid);
+ thrd_id_set_t * waited_by = wait_obj->getWaitedBy();
+ FuncNode * curr_node = func_nodes[func_id];
+
+ /* For each thread waiting for tid */
+ thrd_id_set_iter * tid_iter = waited_by->iterator();
+ while (tid_iter->hasNext()) {
+ thread_id_t waited_by_id = tid_iter->next();
+ WaitObj * other_wait_obj = getWaitObj(waited_by_id);
+
+ node_set_t * target_nodes = other_wait_obj->getTargetNodes(tid);
+ node_set_iter * node_iter = target_nodes->iterator();
+ while (node_iter->hasNext()) {
+ FuncNode * target = node_iter->next();
+ int old_dist = other_wait_obj->lookup_dist(tid, target);
+ int new_dist = curr_node->compute_distance(target, old_dist);
+
+ if (new_dist == -1) {
+ stop_waiting_for_node(waited_by_id, tid, target);
+ }
+ }
+ }
+}
+
+void ModelHistory::monitor_waiting_thread_counter(thread_id_t tid)
+{
+ WaitObj * wait_obj = getWaitObj(tid);
+ thrd_id_set_t * waited_by = wait_obj->getWaitedBy();
+
+ // Thread tid has taken an action, update the counter for threads waiting for tid
+ thrd_id_set_iter * tid_iter = waited_by->iterator();
+ while (tid_iter->hasNext()) {
+ thread_id_t waited_by_id = tid_iter->next();
+ WaitObj * other_wait_obj = getWaitObj(waited_by_id);
+
+ bool expire = other_wait_obj->incr_counter(tid);
+ if (expire) {
+// model_print("thread %d stops waiting for thread %d\n", waited_by_id, tid);
+ wait_obj->remove_waited_by(waited_by_id);
+ other_wait_obj->remove_waiting_for(tid);
+
+ thrd_id_set_t * other_waiting_for = other_wait_obj->getWaitingFor();
+ if ( other_waiting_for->isEmpty() ) {
+ // model_print("\tthread %d waits for nobody, wake up\n", self_id);
+ ModelExecution * execution = model->get_execution();
+ Thread * thread = execution->get_thread(waited_by_id);
+ execution->getFuzzer()->notify_paused_thread(thread);
+ }
+ }
+ }
+}
+
/* Reallocate some snapshotted memories when new executions start */
void ModelHistory::set_new_exec_flag()
{
}
}
}
+
+void ModelHistory::print_waiting_threads()
+{
+ ModelExecution * execution = model->get_execution();
+ for (unsigned int i = 0; i < execution->get_num_threads();i++) {
+ thread_id_t tid = int_to_id(i);
+ WaitObj * wait_obj = getWaitObj(tid);
+ wait_obj->print_waiting_for();
+ }
+
+ for (unsigned int i = 0; i < execution->get_num_threads();i++) {
+ thread_id_t tid = int_to_id(i);
+ WaitObj * wait_obj = getWaitObj(tid);
+ wait_obj->print_waited_by();
+ }
+}
projects / c11tester.git / blobdiff