ASSERT(0);
}
+#include <signal.h>
+
+#define SIGSTACKSIZE 65536
+static void mprot_handle_pf(int sig, siginfo_t *si, void *unused)
+{
+ model_print("Segmentation fault at %p\n", si->si_addr);
+ model_print("For debugging, place breakpoint at: %s:%d\n",
+ __FILE__, __LINE__);
+ print_trace(); // Trace printing may cause dynamic memory allocation
+ while(1)
+ ;
+}
+
+void install_handler() {
+ stack_t ss;
+ ss.ss_sp = model_malloc(SIGSTACKSIZE);
+ ss.ss_size = SIGSTACKSIZE;
+ ss.ss_flags = 0;
+ sigaltstack(&ss, NULL);
+ struct sigaction sa;
+ sa.sa_flags = SA_SIGINFO | SA_NODEFER | SA_RESTART | SA_ONSTACK;
+ sigemptyset(&sa.sa_mask);
+ sa.sa_sigaction = mprot_handle_pf;
+
+ if (sigaction(SIGSEGV, &sa, NULL) == -1) {
+ perror("sigaction(SIGSEGV)");
+ exit(EXIT_FAILURE);
+ }
+
+}
+
/** @brief Constructor */
ModelChecker::ModelChecker() :
/* Initialize default scheduler */
parse_options(¶ms);
initRaceDetector();
/* Configure output redirection for the model-checker */
- redirect_output();
- install_trace_analyses(get_execution());
+ install_handler();
}
/** @brief Destructor */
execution_number ++;
if (more_executions)
reset_to_initial_state();
+
history->set_new_exec_flag();
}
return old->get_return_value();
}
+void ModelChecker::startRunExecution(Thread *old)
+{
+ if (params.traceminsize != 0 &&
+ execution->get_curr_seq_num() > checkfree) {
+ checkfree += params.checkthreshold;
+ execution->collectActions();
+ }
+
+ thread_chosen = false;
+ curr_thread_num = 1;
+ Thread *thr = getNextThread();
+ if (thr != nullptr) {
+ scheduler->set_current_thread(thr);
+ if (old) {
+ if (Thread::swap(old, thr) < 0) {
+ perror("swap threads");
+ exit(EXIT_FAILURE);
+ }
+ } else {
+ if (Thread::swap(&system_context, thr) < 0) {
+ perror("swap threads");
+ exit(EXIT_FAILURE);
+ }
+ }
+ } else
+ handleChosenThread(old);
+}
+
+Thread* ModelChecker::getNextThread()
+{
+ Thread *nextThread = nullptr;
+ for (unsigned int i = curr_thread_num; i < get_num_threads(); i++) {
+ thread_id_t tid = int_to_id(i);
+ Thread *thr = get_thread(tid);
+
+ if (!thr->is_complete() && !thr->get_pending()) {
+ curr_thread_num = i;
+ nextThread = thr;
+ break;
+ }
+ ModelAction *act = thr->get_pending();
+
+ if (act && execution->is_enabled(thr) && !execution->check_action_enabled(act)) {
+ scheduler->sleep(thr);
+ }
+ chooseThread(act, thr);
+ }
+ return nextThread;
+}
+
+/* Swap back to system_context and terminate this execution */
+void ModelChecker::finishRunExecution(Thread *old)
+{
+ scheduler->set_current_thread(NULL);
+ if (old != NULL) {
+ if (Thread::swap(old, &system_context) < 0) {
+ perror("swap threads");
+ exit(EXIT_FAILURE);
+ }
+ }
+ break_execution = true;
+}
+
+void ModelChecker::consumeAction()
+{
+ ModelAction *curr = chosen_thread->get_pending();
+ Thread * th = thread_current();
+ if (curr->get_type() == THREAD_FINISH && th != NULL) {
+ // Thread finish must be consumed in the master context
+ scheduler->set_current_thread(NULL);
+ if (Thread::swap(th, &system_context) < 0) {
+ perror("swap threads");
+ exit(EXIT_FAILURE);
+ }
+ } else {
+ chosen_thread->set_pending(NULL);
+ chosen_thread = execution->take_step(curr);
+ }
+}
+
+void ModelChecker::chooseThread(ModelAction *act, Thread *thr)
+{
+ if (!thread_chosen && act && execution->is_enabled(thr) && (thr->get_state() != THREAD_BLOCKED) ) {
+ if (act->is_write()) {
+ std::memory_order order = act->get_mo();
+ if (order == std::memory_order_relaxed || \
+ order == std::memory_order_release) {
+ chosen_thread = thr;
+ thread_chosen = true;
+ }
+ } else if (act->get_type() == THREAD_CREATE || \
+ act->get_type() == PTHREAD_CREATE || \
+ act->get_type() == THREAD_START || \
+ act->get_type() == THREAD_FINISH) {
+ chosen_thread = thr;
+ thread_chosen = true;
+ }
+ }
+}
+
uint64_t ModelChecker::switch_thread(ModelAction *act)
{
if (modellock) {
}
old->set_pending(act);
+
+ if (old->is_waiting_on(old))
+ assert_bug("Deadlock detected (thread %u)", curr_thread_num);
+
+ if (act && execution->is_enabled(old) && !execution->check_action_enabled(act)) {
+ scheduler->sleep(old);
+ }
+ chooseThread(act, old);
- Thread *next = NULL;
curr_thread_num++;
- while (curr_thread_num < get_num_threads()) {
- thread_id_t tid = int_to_id(curr_thread_num);
- next = get_thread(tid);
- if (!next->is_model_thread() && !next->is_complete() && !next->get_pending())
- break;
- curr_thread_num++;
+ Thread* next = getNextThread();
+ if (next != nullptr)
+ handleNewValidThread(old, next);
+ else {
+ old->set_state(THREAD_READY); // Just to avoid the first ASSERT in ModelExecution::take_step
+ handleChosenThread(old);
}
- if (curr_thread_num < get_num_threads()) {
- scheduler->set_current_thread(next);
- if (old->is_waiting_on(old))
- assert_bug("Deadlock detected (thread %u)", curr_thread_num);
- ModelAction *act = old->get_pending();
-
- if (act && execution->is_enabled(old) && !execution->check_action_enabled(act)) {
- scheduler->sleep(old);
- }
- if (!thread_chosen && act && execution->is_enabled(old) && (old->get_state() != THREAD_BLOCKED) ) {
- if (act->is_write()) {
- std::memory_order order = act->get_mo();
- if (order == std::memory_order_relaxed || \
- order == std::memory_order_release) {
- chosen_thread = old;
- thread_chosen = true;
- }
- } else if (act->get_type() == THREAD_CREATE || \
- act->get_type() == PTHREAD_CREATE || \
- act->get_type() == THREAD_START || \
- act->get_type() == THREAD_FINISH) {
- chosen_thread = old;
- thread_chosen = true;
- }
- }
+ return old->get_return_value();
+}
- if (Thread::swap(old, next) < 0) {
- perror("swap threads");
- exit(EXIT_FAILURE);
- }
+void ModelChecker::handleNewValidThread(Thread *old, Thread *next)
+{
+ scheduler->set_current_thread(next);
+
+ if (Thread::swap(old, next) < 0) {
+ perror("swap threads");
+ exit(EXIT_FAILURE);
+ }
+}
+
+void ModelChecker::handleChosenThread(Thread *old)
+{
+ Thread * th = old ? old : thread_current();
+ if (execution->has_asserted()) {
+ finishRunExecution(th);
+ return;
+ }
+ if (!chosen_thread)
+ chosen_thread = get_next_thread();
+ if (!chosen_thread || chosen_thread->is_model_thread()) {
+ finishRunExecution(th);
+ return;
+ }
+ if (chosen_thread->just_woken_up()) {
+ chosen_thread->set_wakeup_state(false);
+ chosen_thread->set_pending(NULL);
+ chosen_thread = NULL;
+ // Allow this thread to stash the next pending action
+// if (should_terminate_execution())
+// finishRunExecution(th);
+// else
+ startRunExecution(th);
} else {
- scheduler->set_current_thread(NULL);
+ /* Consume the next action for a Thread */
+ consumeAction();
- if (Thread::swap(old, &system_context) < 0) {
- perror("swap threads");
- exit(EXIT_FAILURE);
- }
+ if (should_terminate_execution())
+ finishRunExecution(th);
+ else
+ startRunExecution(th);
}
- return old->get_return_value();
}
static void runChecker() {
void ModelChecker::startChecker() {
startExecution(get_system_context(), runChecker);
snapshot = take_snapshot();
+
+ install_trace_analyses(get_execution());
+ redirect_output();
initMainThread();
}
//Need to initial random number generator state to avoid resets on rollback
char random_state[256];
initstate(423121, random_state, sizeof(random_state));
- modelclock_t checkfree = params.checkthreshold;
+ checkfree = params.checkthreshold;
for(int exec = 0;exec < params.maxexecutions;exec++) {
chosen_thread = init_thread;
- thread_chosen = false;
+ break_execution = false;
do {
- /* Check whether we need to free model actions. */
-
- if (params.traceminsize != 0 &&
- execution->get_curr_seq_num() > checkfree) {
- checkfree += params.checkthreshold;
- execution->collectActions();
- }
-
- /*
- * Stash next pending action(s) for thread(s). There
- * should only need to stash one thread's action--the
- * thread which just took a step--plus the first step
- * for any newly-created thread
- */
- curr_thread_num = 0;
- thread_id_t tid = int_to_id(0);
- Thread *thr = get_thread(tid);
- switch_from_master(thr);
- /*
- for (unsigned int i = 0;i < get_num_threads();i++) {
- thread_id_t tid = int_to_id(i);
- Thread *thr = get_thread(tid);
- if (!thr->is_model_thread() && !thr->is_complete() && !thr->get_pending()) {
- switch_from_master(thr);
- if (thr->is_waiting_on(thr))
- assert_bug("Deadlock detected (thread %u)", i);
- }
- }
- */
- /* Don't schedule threads which should be disabled */
- /*for (unsigned int i = 0;i < get_num_threads();i++) {
- Thread *th = get_thread(int_to_id(i));
- ModelAction *act = th->get_pending();
- if (act && execution->is_enabled(th) && !execution->check_action_enabled(act)) {
- scheduler->sleep(th);
- }
- }
- */
- /*for (unsigned int i = 1;i < get_num_threads();i++) {
- Thread *th = get_thread(int_to_id(i));
- ModelAction *act = th->get_pending();
- if (act && execution->is_enabled(th) && (th->get_state() != THREAD_BLOCKED) ) {
- if (act->is_write()) {
- std::memory_order order = act->get_mo();
- if (order == std::memory_order_relaxed || \
- order == std::memory_order_release) {
- t = th;
- break;
- }
- } else if (act->get_type() == THREAD_CREATE || \
- act->get_type() == PTHREAD_CREATE || \
- act->get_type() == THREAD_START || \
- act->get_type() == THREAD_FINISH) {
- t = th;
- break;
- }
- }
- }
- */
- /* Catch assertions from prior take_step or from
- * between-ModelAction bugs (e.g., data races) */
-
- if (execution->has_asserted())
- break;
- if (!chosen_thread)
- chosen_thread = get_next_thread();
- if (!chosen_thread || chosen_thread->is_model_thread())
+ if (break_execution)
break;
- if (chosen_thread->just_woken_up()) {
- chosen_thread->set_wakeup_state(false);
- chosen_thread->set_pending(NULL);
- chosen_thread = NULL;
- continue; // Allow this thread to stash the next pending action
- }
- /* Consume the next action for a Thread */
- ModelAction *curr = chosen_thread->get_pending();
- chosen_thread->set_pending(NULL);
- chosen_thread = execution->take_step(curr);
+ startRunExecution(NULL);
} while (!should_terminate_execution());
+
finish_execution((exec+1) < params.maxexecutions);
//restore random number generator state after rollback
setstate(random_state);
projects / c11tester.git / blobdiff