#include "history.h"
#include "funcnode.h"
#include "funcinst.h"
-#include "predicate.h"
#include "concretepredicate.h"
#include "waitobj.h"
thrd_pruned_writes(),
paused_thread_list(),
paused_thread_table(128),
- failed_predicates(32)
+ failed_predicates(32),
+ dist_info_vec()
{}
/**
int NewFuzzer::selectWrite(ModelAction *read, SnapVector<ModelAction *> * rf_set)
{
-// return random() % rf_set->size();
+ return random() % rf_set->size();
thread_id_t tid = read->get_tid();
int thread_id = id_to_int(tid);
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);
- Predicate * selected_branch = selectBranch(tid, curr_pred, read_inst);
-
inst_act_map_t * inst_act_map = func_node->get_inst_act_map(tid);
+
+ check_store_visibility(curr_pred, read_inst, inst_act_map, rf_set);
+ Predicate * selected_branch = selectBranch(tid, curr_pred, read_inst);
prune_writes(tid, selected_branch, rf_set, inst_act_map);
if (!failed_predicates.isEmpty())
// No write satisfies the selected predicate, so pause this thread.
while ( rf_set->size() == 0 ) {
- Thread * read_thread = execution->get_thread(tid);
+ Predicate * selected_branch = get_selected_child_branch(tid);
+
//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());
- if (find_threads(read)) {
- // reset thread pending action and revert sequence numbers
- read_thread->set_pending(read);
- read->reset_seq_number();
- execution->restore_last_seq_num();
-
- conditional_sleep(read_thread);
- // Returning -1 stops the while loop of ModelExecution::process_read
- return -1;
- } else {
- Predicate * selected_branch = get_selected_child_branch(tid);
- update_predicate_score(selected_branch, 1);
-
- 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] );
- }
+ 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);
+ // 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);
- FuncNode * func_node = history->get_curr_func_node(tid);
- inst_act_map_t * inst_act_map = func_node->get_inst_act_map(tid);
- prune_writes(tid, selected_branch, rf_set, inst_act_map);
+ FuncNode * func_node = history->get_curr_func_node(tid);
+ inst_act_map_t * inst_act_map = func_node->get_inst_act_map(tid);
+ prune_writes(tid, selected_branch, rf_set, inst_act_map);
- ASSERT(selected_branch);
- }
+ ASSERT(selected_branch);
}
ASSERT(rf_set->size() != 0);
return random_index;
}
-/* Select a random branch from the children of curr_pred
+void NewFuzzer::check_store_visibility(Predicate * curr_pred, FuncInst * read_inst,
+ inst_act_map_t * inst_act_map, SnapVector<ModelAction *> * rf_set)
+{
+ ASSERT(!rf_set->empty());
+ if (curr_pred == NULL || read_inst == NULL)
+ return;
+
+ ModelVector<Predicate *> * children = curr_pred->get_children();
+
+ /* 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) {
+ PredExprSet * pred_expressions = branch->get_pred_expressions();
+
+ /* Do not check unset predicates */
+ if (pred_expressions->isEmpty())
+ continue;
+
+ branch->incr_total_checking_count();
+
+ /* Iterate over all write actions */
+ for (uint j = 0;j < rf_set->size();j++) {
+ ModelAction * write_act = (*rf_set)[j];
+ uint64_t write_val = write_act->get_write_value();
+ bool dummy = true;
+ bool satisfy_predicate = check_predicate_expressions(pred_expressions, inst_act_map, write_val, &dummy);
+
+ /* If one write value satisfies the predicate, go to check the next predicate */
+ if (satisfy_predicate) {
+ branch->incr_store_visible_count();
+ break;
+ }
+ }
+ }
+
+ }
+}
+
+
+/* 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)
ModelVector<Predicate *> * children = curr_pred->get_children();
SnapVector<Predicate *> branches;
- uint32_t numerator = 1;
- for (uint i = 0; i < children->size(); i++) {
+ for (uint i = 0;i < children->size();i++) {
Predicate * child = (*children)[i];
if (child->get_func_inst() == read_inst && !failed_predicates.contains(child)) {
branches.push_back(child);
-
- // max of (exploration counts + 1)
- if (child->get_expl_count() + 1 > numerator)
- numerator = child->get_expl_count() + 1;
}
}
return NULL;
}
- // randomly select a branch
- // int random_index = random() % branches.size();
- // Predicate * random_branch = branches[ random_index ];
-
- int index = choose_index(&branches, numerator);
+ int index = choose_index(&branches, 0);
Predicate * random_branch = branches[ index ];
thrd_selected_child_branch[thread_id] = random_branch;
*
* Note: (1) c_i + 1 is used because counts may be 0.
* (2) The numerator of f_i is chosen to reduce the effect of underflow
- *
+ *
* @param numerator is M defined above
*/
int NewFuzzer::choose_index(SnapVector<Predicate *> * branches, uint32_t numerator)
{
- if (branches->size() == 1)
- return 0;
-
- double total_factor = 0;
- SnapVector<double> factors = SnapVector<double>( branches->size() + 1 );
- for (uint i = 0; i < branches->size(); i++) {
- Predicate * branch = (*branches)[i];
- double factor = (double) numerator / (branch->get_expl_count() + 5 * branch->get_fail_count() + 1);
- total_factor += factor;
- factors.push_back(factor);
- }
-
- double prob = (double) random() / RAND_MAX;
- double prob_sum = 0;
- int index = 0;
-
- for (uint i = 0; i < factors.size(); i++) {
- index = i;
- prob_sum += (double) (factors[i] / total_factor);
- if (prob_sum > prob) {
- break;
- }
- }
-
- return index;
+ return random() % branches->size();
+/*--
+ if (branches->size() == 1)
+ return 0;
+
+ double total_factor = 0;
+ SnapVector<double> factors = SnapVector<double>( branches->size() + 1 );
+ for (uint i = 0; i < branches->size(); i++) {
+ Predicate * branch = (*branches)[i];
+ double factor = (double) numerator / (branch->get_expl_count() + 5 * branch->get_fail_count() + 1);
+ total_factor += factor;
+ factors.push_back(factor);
+ }
+
+ double prob = (double) random() / RAND_MAX;
+ double prob_sum = 0;
+ int index = 0;
+
+ for (uint i = 0; i < factors.size(); i++) {
+ index = i;
+ prob_sum += (double) (factors[i] / total_factor);
+ if (prob_sum > prob) {
+ break;
+ }
+ }
+
+ return index;
+ */
}
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<ModelAction *> * rf_set, inst_act_map_t * inst_act_map)
+ SnapVector<ModelAction *> * rf_set, inst_act_map_t * inst_act_map)
{
if (pred == NULL)
return false;
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<ModelAction *>();
}
SnapVector<ModelAction *> * pruned_writes = thrd_pruned_writes[thread_id];
while ( index < rf_set->size() ) {
ModelAction * write_act = (*rf_set)[index];
uint64_t write_val = write_act->get_write_value();
- bool satisfy_predicate = true;
-
- 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:
- return false;
- 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;
- }
+ bool no_predicate = false;
+ bool satisfy_predicate = check_predicate_expressions(pred_expressions, inst_act_map, write_val, &no_predicate);
- if (!satisfy_predicate)
- break;
- }
+ if (no_predicate)
+ return false;
if (!satisfy_predicate) {
ASSERT(rf_set != NULL);
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
*/
/* history->add_waiting_thread is already called in find_threads */
}
+/**
+ * Decides whether a thread should condition sleep based on
+ * the sleep score of the chosen predicate.
+ *
+ * sleep_score = 0: never sleeps
+ * sleep_score = 100: always sleeps
+ **/
+bool NewFuzzer::should_conditional_sleep(Predicate * predicate)
+{
+ return false;
+ /*
+ int sleep_score = predicate->get_sleep_score();
+ int random_num = random() % 100;
+
+ // should sleep if random_num falls within [0, sleep_score)
+ if (random_num < sleep_score)
+ return true;
+
+ return false;
+ */
+}
+
bool NewFuzzer::has_paused_threads()
{
return paused_thread_list.size() != 0;
threadlist[*numthreads] = tid;
(*numthreads)++;
- Predicate * selected_branch = get_selected_child_branch(tid);
- update_predicate_score(selected_branch, 3);
+/*--
+ 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);
}
history->remove_waiting_write(tid);
history->remove_waiting_thread(tid);
- Predicate * selected_branch = get_selected_child_branch(tid);
- update_predicate_score(selected_branch, 4);
+/*--
+ 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
+/* 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)
bool finds_waiting_for = false;
SnapVector<FuncNode *> * func_node_list = history->getWrFuncNodes(location);
- for (uint i = 0; i < func_node_list->size(); i++) {
+ 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++) {
+ for (uint i = 1;i < execution->get_num_threads();i++) {
thread_id_t tid = int_to_id(i);
if (tid == self_id)
continue;
int distance = node->compute_distance(target_node);
if (distance != -1) {
- history->add_waiting_thread(self_id, tid, target_node, distance);
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));
}
}
}
* type 3: threads are put to sleep but woken up before the waited value appears
* type 4: threads are put to sleep and the waited vaule appears (success)
*/
-void NewFuzzer::update_predicate_score(Predicate * predicate, int type)
+
+/*--
+ void NewFuzzer::update_predicate_score(Predicate * predicate, sleep_result_t type)
+ {
+ switch (type) {
+ case SLEEP_FAIL_TYPE1:
+ predicate->incr_fail_count();
+
+ // Do not choose this predicate when reselecting a new branch
+ failed_predicates.put(predicate, true);
+ break;
+ case SLEEP_FAIL_TYPE2:
+ predicate->incr_fail_count();
+ predicate->incr_sleep_score(1);
+ failed_predicates.put(predicate, true);
+ break;
+ case SLEEP_FAIL_TYPE3:
+ predicate->incr_fail_count();
+ predicate->decr_sleep_score(10);
+ break;
+ case SLEEP_SUCCESS:
+ predicate->incr_sleep_score(10);
+ break;
+ default:
+ model_print("unknown predicate result type.\n");
+ break;
+ }
+ }
+ */
+
+bool NewFuzzer::check_predicate_expressions(PredExprSet * pred_expressions,
+ inst_act_map_t * inst_act_map, uint64_t write_val, bool * no_predicate)
{
- switch (type) {
- case 1:
- predicate->incr_fail_count();
-
- /* Do not choose this predicate when reselecting a new branch */
- failed_predicates.put(predicate, true);
- case 2:
- predicate->incr_fail_count();
- predicate->decr_sleep_score(1);
- case 3:
- predicate->incr_fail_count();
- predicate->incr_sleep_score(10);
- case 4:
- predicate->decr_sleep_score(10);
+ bool satisfy_predicate = true;
+
+ 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;
+ 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;
+ }
+
+ if (!satisfy_predicate)
+ break;
}
+
+ return satisfy_predicate;
}
bool NewFuzzer::shouldWait(const ModelAction * act)
projects / c11tester.git / blobdiff