X-Git-Url: http://plrg.eecs.uci.edu/git/?p=c11tester.git;a=blobdiff_plain;f=newfuzzer.cc;h=7d4e8b1810880f600393e76f5618af8dc2b9516b;hp=68efd37d437a47d4a6ad064f90d67d4f0f181719;hb=7742256df627848c1c375f979f5369a45c92057b;hpb=eed2c95c816686f295d6baa6743f74d9265b40c2 diff --git a/newfuzzer.cc b/newfuzzer.cc index 68efd37d..7d4e8b18 100644 --- a/newfuzzer.cc +++ b/newfuzzer.cc @@ -1,78 +1,146 @@ #include "newfuzzer.h" #include "threads-model.h" -#include "model.h" #include "action.h" -#include "execution.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_curr_pred(), + thrd_last_func_inst(), + available_branches_tmp_storage(), thrd_selected_child_branch(), thrd_pruned_writes(), - paused_thread_set() + paused_thread_list(), + paused_thread_table(128), + dist_info_vec() {} /** * @brief Register the ModelHistory and ModelExecution engine */ -void NewFuzzer::register_engine(ModelHistory * history, ModelExecution *execution) +void NewFuzzer::register_engine(ModelChecker *_model, ModelExecution *execution) { - this->history = history; + this->history = _model->get_history(); this->execution = execution; } int NewFuzzer::selectWrite(ModelAction *read, SnapVector * 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) + 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]) { - thrd_last_read_act[thread_id] = read; - - SnapVector * 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); - prune_writes(tid, selected_branch, rf_set, inst_act_map); + 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; } - // TODO: make this thread sleep if no write satisfies the chosen predicate - // if no read satisfies the selected predicate - 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()); - - read_thread->set_pending(read); - read->reset_seq_number(); // revert some operations - execution->restore_last_seq_num(); - - conditional_sleep(read_thread); - return -1; -/* + // 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 * pruned_writes = thrd_pruned_writes[thread_id]; - for (uint i = 0; i < pruned_writes->size(); i++) + for (uint i = 0;i < pruned_writes->size();i++) { rf_set->push_back( (*pruned_writes)[i] ); - pruned_writes->clear(); -*/ + } + + // 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); } - ASSERT(rf_set->size() != 0); int random_index = random() % rf_set->size(); return random_index; } -/* Select a random branch from the children of curr_pred +/* 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 * rf_set) +{ + available_branches_tmp_storage.clear(); + + ASSERT(!rf_set->empty()); + if (curr_pred == NULL || read_inst == NULL) + return false; + + ModelVector * 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) @@ -86,27 +154,54 @@ Predicate * NewFuzzer::selectBranch(thread_id_t tid, Predicate * curr_pred, Func return NULL; } - ModelVector * children = curr_pred->get_children(); - SnapVector branches; - - for (uint i = 0; i < children->size(); i++) { - Predicate * child = (*children)[i]; - if (child->get_func_inst() == read_inst) - branches.push_back(child); - } - // predicate children have not been generated - if (branches.size() == 0) { + if (available_branches_tmp_storage.size() == 0) { thrd_selected_child_branch[thread_id] = NULL; return NULL; } - // randomly select a branch - int random_index = random() % branches.size(); - Predicate * random_branch = branches[ random_index ]; - thrd_selected_child_branch[thread_id] = random_branch; + 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 * branches) +{ + if (branches->size() == 1) + return 0; + + double total_weight = 0; + SnapVector 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 random_branch; + return index; +// return random() % branches->size(); } Predicate * NewFuzzer::get_selected_child_branch(thread_id_t tid) @@ -118,13 +213,12 @@ Predicate * NewFuzzer::get_selected_child_branch(thread_id_t tid) return thrd_selected_child_branch[thread_id]; } -/* Remove writes from the rf_set that do not satisfie the selected predicate, +/* 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 * rf_set, inst_act_map_t * inst_act_map) +bool NewFuzzer::prune_writes(thread_id_t tid, Predicate * pred, SnapVector * rf_set) { if (pred == NULL) return false; @@ -138,108 +232,220 @@ bool NewFuzzer::prune_writes(thread_id_t tid, Predicate * pred, 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++) + for (uint i = old_size;i < new_size;i++) thrd_pruned_writes[i] = new SnapVector(); } SnapVector * pruned_writes = thrd_pruned_writes[thread_id]; pruned_writes->clear(); // clear the old pruned_writes set bool pruned = false; - uint index = 0; - while ( index < rf_set->size() ) { - ModelAction * write_act = (*rf_set)[index]; + 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(); - uint64_t write_val = write_act->get_write_value(); bool equality; - // No predicate, return false - if (expression->token == NOPREDICATE) - return pruned; - - switch(expression->token) { - case EQUALITY: - FuncInst * to_be_compared; - ModelAction * last_act; - uint64_t last_read; - - to_be_compared = expression->func_inst; - last_act = inst_act_map->get(to_be_compared); - last_read = last_act->get_reads_from_value(); - - equality = (write_val == last_read); - if (equality != expression->value) - satisfy_predicate = false; - break; - case NULLITY: - equality = ((void*)write_val == NULL); - if (equality != expression->value) - satisfy_predicate = false; - break; - default: - model_print("unknown predicate token\n"); - break; + 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)[index] = rf_set->back(); + (*rf_set)[rf_index] = rf_set->back(); rf_set->pop_back(); pruned_writes->push_back(write_act); pruned = true; } else - index++; + rf_index++; } return pruned; } -/* @brief Put a thread to sleep because no writes in rf_set satisfies the selected predicate. +/* @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) { - model->getScheduler()->add_sleep(thread); - paused_thread_set.push_back(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_set.size() != 0; + 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\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; int thread = threadlist[random_index]; thread_id_t curr_tid = int_to_id(thread); - return model->get_thread(curr_tid); + 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_set.size(); - Thread * thread = paused_thread_set[random_index]; + int random_index = random() % paused_thread_list.size(); + Thread * thread = paused_thread_list[random_index]; model->getScheduler()->remove_sleep(thread); - paused_thread_set[random_index] = paused_thread_set.back(); - paused_thread_set.pop_back(); + 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); - model_print("thread %d is woken up\n", thread->get_id()); - threadlist[*numthreads] = thread->get_id(); + 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 * 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; +} + +bool NewFuzzer::shouldWait(const ModelAction * act) +{ + return true; }