thrd_curr_pred(),
thrd_selected_child_branch(),
thrd_pruned_writes(),
- paused_thread_set()
+ paused_thread_set(),
+ paused_thread_table(128)
{}
/**
if (read != thrd_last_read_act[thread_id]) {
thrd_last_read_act[thread_id] = read;
- SnapVector<func_id_list_t> * thrd_func_list = execution->get_thrd_func_list();
- uint32_t func_id = (*thrd_func_list)[thread_id].back();
- FuncNode * func_node = history->get_func_node(func_id);
- inst_act_map_t * inst_act_map = func_node->get_inst_act_map(tid);
+ FuncNode * func_node = history->get_curr_func_node(tid);
Predicate * curr_pred = func_node->get_predicate_tree_position(tid);
FuncInst * read_inst = func_node->get_inst(read);
-
Predicate * selected_branch = selectBranch(tid, curr_pred, read_inst);
+
+ inst_act_map_t * inst_act_map = func_node->get_inst_act_map(tid);
prune_writes(tid, selected_branch, rf_set, inst_act_map);
}
- // No write satisfies the selected predicate
+ // No write satisfies the selected predicate, so pause this thread.
if ( rf_set->size() == 0 ) {
Thread * read_thread = execution->get_thread(tid);
- model_print("the %d read action of thread %d is unsuccessful\n", read->get_seq_number(), read_thread->get_id());
+ model_print("the %d read action of thread %d at %p is unsuccessful\n", read->get_seq_number(), read_thread->get_id(), read->get_location());
// reset thread pending action and revert sequence numbers
read_thread->set_pending(read);
execution->restore_last_seq_num();
conditional_sleep(read_thread);
+
+ find_threads(read);
+
return -1;
/*
SnapVector<ModelAction *> * pruned_writes = thrd_pruned_writes[thread_id];
index++;
}
+ delete concrete_pred;
+
return pruned;
}
*/
void NewFuzzer::conditional_sleep(Thread * thread)
{
+ int index = paused_thread_set.size();
+
model->getScheduler()->add_sleep(thread);
paused_thread_set.push_back(thread);
+ paused_thread_table.put(thread, index); // Update table
+
+ /* Add the waiting condition to ModelHistory */
+ ModelAction * read = thread->get_pending();
+ thread_id_t tid = thread->get_id();
+ FuncNode * func_node = history->get_curr_func_node(tid);
+ inst_act_map_t * inst_act_map = func_node->get_inst_act_map(tid);
+
+ Predicate * selected_branch = get_selected_child_branch(tid);
+ ConcretePredicate * concrete = selected_branch->evaluate(inst_act_map, tid);
+ concrete->set_location(read->get_location());
+
+ history->add_waiting_write(concrete);
}
bool NewFuzzer::has_paused_threads()
{
if (numthreads == 0 && has_paused_threads()) {
wake_up_paused_threads(threadlist, &numthreads);
- model_print("list size: %d\n", numthreads);
- model_print("active t id: %d\n", threadlist[0]);
+ model_print("list size: %d, active t id: %d\n", numthreads, threadlist[0]);
}
int random_index = random() % numthreads;
return model->get_thread(curr_tid);
}
-/* Force waking up one of threads paused by Fuzzer */
+/* Force waking up one of threads paused by Fuzzer, because otherwise
+ * the Fuzzer is not making progress
+ */
void NewFuzzer::wake_up_paused_threads(int * threadlist, int * numthreads)
{
int random_index = random() % paused_thread_set.size();
Thread * thread = paused_thread_set[random_index];
model->getScheduler()->remove_sleep(thread);
- paused_thread_set[random_index] = paused_thread_set.back();
+ Thread * last_thread = paused_thread_set.back();
+ paused_thread_set[random_index] = last_thread;
paused_thread_set.pop_back();
+ paused_thread_table.put(last_thread, random_index); // Update table
+ paused_thread_table.remove(thread);
+
+ thread_id_t tid = thread->get_id();
+ history->remove_waiting_write(tid);
- model_print("thread %d is woken up\n", thread->get_id());
- threadlist[*numthreads] = thread->get_id();
+ model_print("thread %d is woken up\n", tid);
+ threadlist[*numthreads] = tid;
(*numthreads)++;
}
-/* Notify one of conditional sleeping threads if the desired write is available */
-bool NewFuzzer::notify_conditional_sleep(Thread * thread)
+/* Wake up conditional sleeping threads if the desired write is available */
+void NewFuzzer::notify_paused_thread(Thread * thread)
{
-
+ ASSERT(paused_thread_table.contains(thread));
+
+ int index = paused_thread_table.get(thread);
+ model->getScheduler()->remove_sleep(thread);
+
+ Thread * last_thread = paused_thread_set.back();
+ paused_thread_set[index] = last_thread;
+ paused_thread_set.pop_back();
+ paused_thread_table.put(last_thread, index); // Update table
+ paused_thread_table.remove(thread);
+
+ thread_id_t tid = thread->get_id();
+ history->remove_waiting_write(tid);
+}
+
+/* Find threads that may write values that the pending read action is waiting for */
+void NewFuzzer::find_threads(ModelAction * pending_read)
+{
+ void * location = pending_read->get_location();
+ thread_id_t self_id = pending_read->get_tid();
+
+ SnapVector<FuncNode *> * func_node_list = history->getWrFuncNodes(location);
+ for (uint i = 0; i < func_node_list->size(); i++) {
+ FuncNode * target_node = (*func_node_list)[i];
+ model_print("node %s may write to loc %p\n", target_node->get_func_name(), location);
+
+ for (uint i = 1; i < execution->get_num_threads(); i++) {
+ thread_id_t tid = int_to_id(i);
+ if (tid == self_id)
+ continue;
+
+ FuncNode * node = history->get_curr_func_node(tid);
+ if (node == NULL)
+ continue;
+
+ int distance = node->compute_distance(target_node);
+ model_print("thread: %d; distance from node %d to node %d: %d\n", tid, node->get_func_id(), target_node->get_func_id(), distance);
+ }
+ }
}
bool NewFuzzer::shouldWait(const ModelAction * act)
projects / c11tester.git / blobdiff