+++ /dev/null
-#include <inttypes.h>
-#include "history.h"
-#include "action.h"
-#include "funcnode.h"
-#include "funcinst.h"
-#include "common.h"
-#include "concretepredicate.h"
-#include "waitobj.h"
-
-#include "model.h"
-#include "execution.h"
-#include "newfuzzer.h"
-
-/** @brief Constructor */
-ModelHistory::ModelHistory() :
- func_counter(1), /* function id starts with 1 */
- last_seq_number(INIT_SEQ_NUMBER),
- func_map(),
- func_map_rev(),
- func_nodes()
-{
- /* The following are snapshot data structures */
- 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_func_list = new SnapVector<func_id_list_t>();
- thrd_last_entered_func = new SnapVector<uint32_t>();
- thrd_waiting_write = new SnapVector<ConcretePredicate *>();
- thrd_wait_obj = new SnapVector<WaitObj *>();
-}
-
-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);
- uint id = id_to_int(tid);
-
- if ( thrd_func_list->size() <= id ) {
- uint oldsize = thrd_func_list->size();
- thrd_func_list->resize( id + 1 );
-
- for (uint i = oldsize;i < id + 1;i++) {
- // push 0 as a dummy function id to a void seg fault
- new (&(*thrd_func_list)[i]) func_id_list_t();
- (*thrd_func_list)[i].push_back(0);
- thrd_last_entered_func->push_back(0);
- }
- }
-
- uint32_t last_entered_func_id = (*thrd_last_entered_func)[id];
- (*thrd_last_entered_func)[id] = func_id;
- (*thrd_func_list)[id].push_back(func_id);
-
- if ( func_nodes.size() <= func_id )
- resize_func_nodes( func_id + 1 );
-
- FuncNode * func_node = func_nodes[func_id];
- func_node->function_entry_handler(tid);
-
- /* Add edges between FuncNodes */
- if (last_entered_func_id != 0) {
- 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::exit_function(const uint32_t func_id, thread_id_t tid)
-{
- uint32_t id = id_to_int(tid);
- uint32_t last_func_id = (*thrd_func_list)[id].back();
-
- if (last_func_id == func_id) {
- FuncNode * func_node = func_nodes[func_id];
- func_node->function_exit_handler(tid);
-
- (*thrd_func_list)[id].pop_back();
- } else {
- ASSERT(false);
- }
- //model_print("thread %d exiting func %d\n", tid, func_id);
-}
-
-void ModelHistory::resize_func_nodes(uint32_t new_size)
-{
- uint32_t old_size = func_nodes.size();
-
- if ( old_size < new_size )
- func_nodes.resize(new_size);
-
- for (uint32_t id = old_size;id < new_size;id++) {
- const char * func_name = func_map_rev[id];
- FuncNode * func_node = new FuncNode(this);
- func_node->set_func_id(id);
- func_node->set_func_name(func_name);
- func_nodes[id] = func_node;
- }
-}
-
-void ModelHistory::process_action(ModelAction *act, thread_id_t tid)
-{
- 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;
-
- /* 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);
-
- /* 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);
- }
-
- 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;
-
- if (skip_action(act))
- return;
-
- FuncNode * func_node = func_nodes[func_id];
- func_node->add_inst(act);
-
- func_node->update_tree(act);
- last_seq_number = act->get_seq_number();
-}
-
-/* Return the FuncNode given its func_id */
-FuncNode * ModelHistory::get_func_node(uint32_t func_id)
-{
- if (func_id == 0)
- return NULL;
-
- // This node has not been added to func_nodes
- if (func_nodes.size() <= func_id)
- return NULL;
-
- return func_nodes[func_id];
-}
-
-/* Return the current FuncNode when given a thread id */
-FuncNode * ModelHistory::get_curr_func_node(thread_id_t tid)
-{
- int thread_id = id_to_int(tid);
- uint32_t func_id = (*thrd_func_list)[thread_id].back();
-
- if (func_id != 0) {
- return func_nodes[func_id];
- }
-
- return NULL;
-}
-
-void ModelHistory::update_write_history(void * location, uint64_t write_val)
-{
- value_set_t * write_set = write_history->get(location);
-
- if (write_set == NULL) {
- write_set = new value_set_t();
- write_history->put(location, write_set);
- }
-
- write_set->add(write_val);
-}
-
-void ModelHistory::update_loc_rd_func_nodes_map(void * location, FuncNode * node)
-{
- 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 SnapVector<FuncNode *>();
- loc_rd_func_nodes_map->put(location, func_node_list);
- }
-
- return func_node_list;
-}
-
-SnapVector<FuncNode *> * ModelHistory::getWrFuncNodes(void * location)
-{
- SnapVector<FuncNode *> * func_node_list = loc_wr_func_nodes_map->get(location);
- if (func_node_list == NULL) {
- func_node_list = new SnapVector<FuncNode *>();
- loc_wr_func_nodes_map->put(location, func_node_list);
- }
-
- return func_node_list;
-}
-
-/* When a thread is paused by Fuzzer, keep track of the condition it is waiting for */
-void ModelHistory::add_waiting_write(ConcretePredicate * concrete)
-{
- void * location = concrete->get_location();
- SnapVector<ConcretePredicate *> * waiting_conditions = loc_waiting_writes_map->get(location);
- if (waiting_conditions == NULL) {
- waiting_conditions = new SnapVector<ConcretePredicate *>();
- loc_waiting_writes_map->put(location, waiting_conditions);
- }
-
- /* waiting_conditions should not have duplications */
- waiting_conditions->push_back(concrete);
-
- int thread_id = id_to_int(concrete->get_tid());
- if (thrd_waiting_write->size() <= (uint) thread_id) {
- thrd_waiting_write->resize(thread_id + 1);
- }
-
- (*thrd_waiting_write)[thread_id] = concrete;
-}
-
-void ModelHistory::remove_waiting_write(thread_id_t tid)
-{
- ConcretePredicate * concrete = (*thrd_waiting_write)[ id_to_int(tid) ];
- 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) {
- (*concrete_preds)[i] = concrete_preds->back();
- concrete_preds->pop_back();
- break;
- }
- }
-
- int thread_id = id_to_int( concrete->get_tid() );
- (*thrd_waiting_write)[thread_id] = NULL;
- delete concrete;
-}
-
-/* Check if any other thread is waiting for this write action. If so, "notify" them */
-void ModelHistory::check_waiting_write(ModelAction * write_act)
-{
- void * location = write_act->get_location();
- uint64_t value = write_act->get_write_value();
- SnapVector<ConcretePredicate *> * concrete_preds = loc_waiting_writes_map->get(location);
- if (concrete_preds == NULL)
- return;
-
- uint index = 0;
- while (index < concrete_preds->size()) {
- ConcretePredicate * concrete_pred = (*concrete_preds)[index];
- SnapVector<struct concrete_pred_expr> * concrete_exprs = concrete_pred->getExpressions();
- bool satisfy_predicate = true;
- /* Check if the written value satisfies every predicate expression */
- for (uint i = 0;i < concrete_exprs->size();i++) {
- struct concrete_pred_expr concrete = (*concrete_exprs)[i];
- bool equality = false;
- switch (concrete.token) {
- case EQUALITY:
- equality = (value == concrete.value);
- break;
- case NULLITY:
- equality = ((void*)value == NULL);
- break;
- default:
- model_print("unknown predicate token");
- break;
- }
-
- if (equality != concrete.equality) {
- satisfy_predicate = false;
- break;
- }
- }
-
- if (satisfy_predicate) {
- /* 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());
- ((NewFuzzer *)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];
-}
-
-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);
-
- /* Update waited-by relation */
- WaitObj * other_wait_obj = getWaitObj(waiting_for_id);
- other_wait_obj->add_waited_by(self_id);
-}
-
-/* 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();
- delete iter;
-}
-
-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);
- ((NewFuzzer *)execution->getFuzzer())->notify_paused_thread(thread);
- }
- }
-}
-
-bool ModelHistory::skip_action(ModelAction * act)
-{
- 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 (last_seq_number != INIT_SEQ_NUMBER && last_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);
- }
- }
-
- delete node_iter;
- }
-
- delete tid_iter;
-}
-
-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);
- ((NewFuzzer *)execution->getFuzzer())->notify_paused_thread(thread);
- }
- }
- }
-
- delete tid_iter;
-}
-
-/* Reallocate some snapshotted memories when new executions start */
-void ModelHistory::set_new_exec_flag()
-{
- for (uint i = 1;i < func_nodes.size();i++) {
- FuncNode * func_node = func_nodes[i];
- func_node->set_new_exec_flag();
- }
-}
-
-void ModelHistory::dump_func_node_graph()
-{
- model_print("digraph func_node_graph {\n");
- for (uint i = 1;i < func_nodes.size();i++) {
- FuncNode * node = func_nodes[i];
- ModelList<FuncNode *> * out_edges = node->get_out_edges();
-
- model_print("\"%p\" [label=\"%s\"]\n", node, node->get_func_name());
- mllnode<FuncNode *> * it;
- for (it = out_edges->begin();it != NULL;it = it->getNext()) {
- FuncNode * other = it->getVal();
- model_print("\"%p\" -> \"%p\"\n", node, other);
- }
- }
- model_print("}\n");
-}
-
-void ModelHistory::print_func_node()
-{
- /* function id starts with 1 */
- for (uint32_t i = 1;i < func_nodes.size();i++) {
- FuncNode * func_node = func_nodes[i];
- func_node->print_predicate_tree();
-
-/*
- func_inst_list_mt * entry_insts = func_node->get_entry_insts();
- model_print("function %s has entry actions\n", func_node->get_func_name());
-
- mllnode<FuncInst*>* it;
- for (it = entry_insts->begin();it != NULL;it=it->getNext()) {
- FuncInst *inst = it->getVal();
- model_print("type: %d, at: %s\n", inst->get_type(), inst->get_position());
- }
- */
- }
-}
-
-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();
- }
-}
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