+++ /dev/null
-#include "newfuzzer.h"
-#include "threads-model.h"
-#include "action.h"
-#include "history.h"
-#include "funcnode.h"
-#include "funcinst.h"
-#include "concretepredicate.h"
-#include "waitobj.h"
-
-#include "model.h"
-#include "schedule.h"
-#include "execution.h"
-
-NewFuzzer::NewFuzzer() :
- thrd_last_read_act(),
- thrd_last_func_inst(),
- available_branches_tmp_storage(),
- thrd_selected_child_branch(),
- thrd_pruned_writes(),
- paused_thread_list(),
- paused_thread_table(128),
- dist_info_vec()
-{}
-
-/**
- * @brief Register the ModelHistory and ModelExecution engine
- */
-void NewFuzzer::register_engine(ModelChecker *_model, ModelExecution *execution)
-{
- this->history = _model->get_history();
- this->execution = execution;
-}
-
-int NewFuzzer::selectWrite(ModelAction *read, SnapVector<ModelAction *> * rf_set)
-{
- return random() % rf_set->size();
-
- thread_id_t tid = read->get_tid();
- int thread_id = id_to_int(tid);
-
- if (thrd_last_read_act.size() <= (uint) thread_id) {
- thrd_last_read_act.resize(thread_id + 1);
- thrd_last_func_inst.resize(thread_id + 1);
- }
-
- // A new read action is encountered, select a random child branch of current predicate
- if (read != thrd_last_read_act[thread_id]) {
- 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);
-
- if (curr_pred != NULL) {
- Predicate * selected_branch = NULL;
-
- if (check_branch_inst(curr_pred, read_inst, rf_set))
- selected_branch = selectBranch(tid, curr_pred, read_inst);
- else {
- // no child of curr_pred matches read_inst, check back edges
- PredSet * back_edges = curr_pred->get_backedges();
- PredSetIter * it = back_edges->iterator();
-
- while (it->hasNext()) {
- curr_pred = it->next();
- if (check_branch_inst(curr_pred, read_inst, rf_set)) {
- selected_branch = selectBranch(tid, curr_pred, read_inst);
- break;
- }
- }
-
- delete it;
- }
-
- thrd_selected_child_branch[thread_id] = selected_branch;
- prune_writes(tid, selected_branch, rf_set);
- }
-
- thrd_last_read_act[thread_id] = read;
- thrd_last_func_inst[thread_id] = read_inst;
- }
-
- // The chosen branch fails, reselect new branches
- while ( rf_set->size() == 0 ) {
- Predicate * selected_branch = get_selected_child_branch(tid);
- FuncNode * func_node = history->get_curr_func_node(tid);
-
- // Increment failure count
- selected_branch->incr_fail_count();
- func_node->add_predicate_to_trace(tid, selected_branch); // For updating predicate weight
-
- //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());
-
- SnapVector<ModelAction *> * pruned_writes = thrd_pruned_writes[thread_id];
- for (uint i = 0;i < pruned_writes->size();i++) {
- rf_set->push_back( (*pruned_writes)[i] );
- }
-
- // Reselect a predicate and prune writes
- Predicate * curr_pred = selected_branch->get_parent();
- FuncInst * read_inst = thrd_last_func_inst[thread_id];
- selected_branch = selectBranch(tid, curr_pred, read_inst);
- thrd_selected_child_branch[thread_id] = selected_branch;
-
- prune_writes(tid, selected_branch, rf_set);
-
- ASSERT(selected_branch);
- }
-
- int random_index = random() % rf_set->size();
-
- return random_index;
-}
-
-/* Check if children of curr_pred match read_inst.
- * @return False if no child matches read_inst
- */
-bool NewFuzzer::check_branch_inst(Predicate * curr_pred, FuncInst * read_inst,
- SnapVector<ModelAction *> * rf_set)
-{
- available_branches_tmp_storage.clear();
-
- ASSERT(!rf_set->empty());
- if (curr_pred == NULL || read_inst == NULL)
- return false;
-
- ModelVector<Predicate *> * children = curr_pred->get_children();
- bool any_child_match = false;
-
- /* Iterate over all predicate children */
- for (uint i = 0;i < children->size();i++) {
- Predicate * branch = (*children)[i];
-
- /* The children predicates may have different FuncInsts */
- if (branch->get_func_inst() == read_inst) {
- any_child_match = true;
- branch->incr_total_checking_count();
- available_branches_tmp_storage.push_back(branch);
- }
- }
-
- return any_child_match;
-}
-
-/* Select a random branch from the children of curr_pred
- * @return The selected branch
- */
-Predicate * NewFuzzer::selectBranch(thread_id_t tid, Predicate * curr_pred, FuncInst * read_inst)
-{
- int thread_id = id_to_int(tid);
- if ( thrd_selected_child_branch.size() <= (uint) thread_id)
- thrd_selected_child_branch.resize(thread_id + 1);
-
- if (curr_pred == NULL || read_inst == NULL) {
- thrd_selected_child_branch[thread_id] = NULL;
- return NULL;
- }
-
- // predicate children have not been generated
- if (available_branches_tmp_storage.size() == 0) {
- thrd_selected_child_branch[thread_id] = NULL;
- return NULL;
- }
-
- int index = choose_branch_index(&available_branches_tmp_storage);
- Predicate * selected_branch = available_branches_tmp_storage[ index ];
-
- /* Remove the chosen branch from vec in case that this
- * branch fails and need to choose another one */
- available_branches_tmp_storage[index] = available_branches_tmp_storage.back();
- available_branches_tmp_storage.pop_back();
-
- return selected_branch;
-}
-
-/**
- * @brief Select a branch from the given predicate branch
- */
-int NewFuzzer::choose_branch_index(SnapVector<Predicate *> * branches)
-{
- if (branches->size() == 1)
- return 0;
-
- double total_weight = 0;
- SnapVector<double> weights;
- for (uint i = 0;i < branches->size();i++) {
- Predicate * branch = (*branches)[i];
- double weight = branch->get_weight();
- total_weight += weight;
- weights.push_back(weight);
- }
-
- double prob = (double) random() / RAND_MAX;
- double prob_sum = 0;
- int index = 0;
-
- for (uint i = 0;i < weights.size();i++) {
- index = i;
- prob_sum += (double) (weights[i] / total_weight);
- if (prob_sum > prob) {
- break;
- }
- }
-
- return index;
-// return random() % branches->size();
-}
-
-Predicate * NewFuzzer::get_selected_child_branch(thread_id_t tid)
-{
- int thread_id = id_to_int(tid);
- if (thrd_selected_child_branch.size() <= (uint) thread_id)
- return NULL;
-
- return thrd_selected_child_branch[thread_id];
-}
-
-/* Remove writes from the rf_set that do not satisfie the selected predicate,
- * and store them in thrd_pruned_writes
- *
- * @return true if rf_set is pruned
- */
-bool NewFuzzer::prune_writes(thread_id_t tid, Predicate * pred, SnapVector<ModelAction *> * rf_set)
-{
- if (pred == NULL)
- return false;
-
- PredExprSet * pred_expressions = pred->get_pred_expressions();
- if (pred_expressions->getSize() == 0) // unset predicates
- return false;
-
- int thread_id = id_to_int(tid);
- uint old_size = thrd_pruned_writes.size();
- if (thrd_pruned_writes.size() <= (uint) thread_id) {
- uint new_size = thread_id + 1;
- thrd_pruned_writes.resize(new_size);
- for (uint i = old_size;i < new_size;i++)
- thrd_pruned_writes[i] = new SnapVector<ModelAction *>();
- }
- SnapVector<ModelAction *> * pruned_writes = thrd_pruned_writes[thread_id];
- pruned_writes->clear(); // clear the old pruned_writes set
-
- bool pruned = false;
- uint rf_index = 0;
-
- while ( rf_index < rf_set->size() ) {
- ModelAction * write_act = (*rf_set)[rf_index];
- uint64_t write_val = write_act->get_write_value();
- bool no_predicate = false;
- bool satisfy_predicate = true;
-
- // Check if the write value satisfies the predicates
- PredExprSetIter * pred_expr_it = pred_expressions->iterator();
- while (pred_expr_it->hasNext()) {
- struct pred_expr * expression = pred_expr_it->next();
- bool equality;
-
- switch (expression->token) {
- case NOPREDICATE:
- no_predicate = true;
- break;
- case EQUALITY:
- FuncInst * to_be_compared;
- FuncNode * func_node;
- uint64_t last_read;
-
- to_be_compared = expression->func_inst;
- func_node = history->get_curr_func_node(tid);
- last_read = func_node->get_associated_read(tid, to_be_compared);
- ASSERT(last_read != VALUE_NONE);
-
- equality = (write_val == last_read);
- if (equality != expression->value)
- satisfy_predicate = false;
- break;
- case NULLITY:
- // TODO: implement likely to be null
- equality = ((void*) (write_val & 0xffffffff) == NULL);
- if (equality != expression->value)
- satisfy_predicate = false;
- break;
- default:
- model_print("unknown predicate token\n");
- break;
- }
-
- if (!satisfy_predicate)
- break;
- }
- delete pred_expr_it;
-
- if (no_predicate)
- return false;
-
- if (!satisfy_predicate) {
- ASSERT(rf_set != NULL);
- (*rf_set)[rf_index] = rf_set->back();
- rf_set->pop_back();
- pruned_writes->push_back(write_act);
- pruned = true;
- } else
- rf_index++;
- }
-
- return pruned;
-}
-
-/* @brief Put a thread to sleep because no writes in rf_set satisfies the selected predicate.
- *
- * @param thread A thread whose last action is a read
- */
-void NewFuzzer::conditional_sleep(Thread * thread)
-{
-/*
- int index = paused_thread_list.size();
-
- model->getScheduler()->add_sleep(thread);
- paused_thread_list.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());
-
- ASSERT(false);
-
- // history->add_waiting_write(concrete);
- // history->add_waiting_thread is already called in find_threads
- */
-}
-
-bool NewFuzzer::has_paused_threads()
-{
- return paused_thread_list.size() != 0;
-}
-
-Thread * NewFuzzer::selectThread(int * threadlist, int numthreads)
-{
- if (numthreads == 0 && has_paused_threads()) {
- wake_up_paused_threads(threadlist, &numthreads);
- //model_print("list size: %d, active t id: %d\n", numthreads, threadlist[0]);
- }
- int random_index = random() % numthreads;
- int thread = threadlist[random_index];
- thread_id_t curr_tid = int_to_id(thread);
- return execution->get_thread(curr_tid);
-}
-
-/* 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_list.size();
- Thread * thread = paused_thread_list[random_index];
- model->getScheduler()->remove_sleep(thread);
-
- Thread * last_thread = paused_thread_list.back();
- paused_thread_list[random_index] = last_thread;
- paused_thread_list.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);
- history->remove_waiting_thread(tid);
-
- threadlist[*numthreads] = tid;
- (*numthreads)++;
-
-/*--
- Predicate * selected_branch = get_selected_child_branch(tid);
- update_predicate_score(selected_branch, SLEEP_FAIL_TYPE3);
- */
-
- model_print("thread %d is woken up\n", tid);
-}
-
-/* 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_list.back();
- paused_thread_list[index] = last_thread;
- paused_thread_list.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);
- history->remove_waiting_thread(tid);
-
-/*--
- Predicate * selected_branch = get_selected_child_branch(tid);
- update_predicate_score(selected_branch, SLEEP_SUCCESS);
- */
-
- model_print("** thread %d is woken up\n", tid);
-}
-
-/* Find threads that may write values that the pending read action is waiting for.
- * Side effect: waiting thread related info are stored in dist_info_vec
- *
- * @return True if any thread is found
- */
-bool NewFuzzer::find_threads(ModelAction * pending_read)
-{
- ASSERT(pending_read->is_read());
-
- void * location = pending_read->get_location();
- thread_id_t self_id = pending_read->get_tid();
- bool finds_waiting_for = false;
-
- 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];
- 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);
- /* It is possible that thread tid is not in any FuncNode */
- if (node == NULL)
- continue;
-
- int distance = node->compute_distance(target_node);
- if (distance != -1) {
- finds_waiting_for = true;
- //model_print("thread: %d; distance from node %d to node %d: %d\n", tid, node->get_func_id(), target_node->get_func_id(), distance);
-
- dist_info_vec.push_back(node_dist_info(tid, target_node, distance));
- }
- }
- }
-
- return finds_waiting_for;
-}
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