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::continueRunExecution(Thread *old)
+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 (Thread::swap(old, thr) < 0) {
- perror("swap threads");
- exit(EXIT_FAILURE);
- }
- } else
- handleChosenThread(old);
-}
-void ModelChecker::startRunExecution(ucontext_t *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 (Thread::swap(old, thr) < 0) {
- perror("swap threads");
- exit(EXIT_FAILURE);
+ 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);
+ handleChosenThread(old);
}
Thread* ModelChecker::getNextThread()
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 (Thread::swap(old, &system_context) < 0) {
- perror("swap threads");
- exit(EXIT_FAILURE);
+ if (old != NULL) {
+ if (Thread::swap(old, &system_context) < 0) {
+ perror("swap threads");
+ exit(EXIT_FAILURE);
+ }
}
-}
-
-void ModelChecker::finishRunExecution(ucontext_t *old)
-{
- scheduler->set_current_thread(NULL);
+ break_execution = true;
}
void ModelChecker::consumeAction()
{
ModelAction *curr = chosen_thread->get_pending();
- chosen_thread->set_pending(NULL);
- chosen_thread = execution->take_step(curr);
+ 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 (old->is_waiting_on(old))
assert_bug("Deadlock detected (thread %u)", curr_thread_num);
- ModelAction *act2 = old->get_pending();
-
- if (act2 && execution->is_enabled(old) && !execution->check_action_enabled(act2)) {
+ if (act && execution->is_enabled(old) && !execution->check_action_enabled(act)) {
scheduler->sleep(old);
}
- chooseThread(act2, old);
+ chooseThread(act, old);
curr_thread_num++;
Thread* next = getNextThread();
if (next != nullptr)
handleNewValidThread(old, next);
- else
+ else {
+ old->set_state(THREAD_READY); // Just to avoid the first ASSERT in ModelExecution::take_step
handleChosenThread(old);
+ }
return old->get_return_value();
}
void ModelChecker::handleNewValidThread(Thread *old, Thread *next)
{
- scheduler->set_current_thread(next);
+ scheduler->set_current_thread(next);
if (Thread::swap(old, next) < 0) {
perror("swap threads");
exit(EXIT_FAILURE);
- }
+ }
}
void ModelChecker::handleChosenThread(Thread *old)
{
- if (execution->has_asserted())
- finishRunExecution(old);
- if (!chosen_thread)
- chosen_thread = get_next_thread();
- if (!chosen_thread || chosen_thread->is_model_thread())
- finishRunExecution(old);
- 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(old);
- else
- continueRunExecution(old);
- } else {
- /* Consume the next action for a Thread */
- consumeAction();
-
- if (should_terminate_execution())
- finishRunExecution(old);
- else
- continueRunExecution(old);
+ Thread * th = old ? old : thread_current();
+ if (execution->has_asserted()) {
+ finishRunExecution(th);
+ return;
}
-}
-
-void ModelChecker::handleChosenThread(ucontext_t *old)
-{
- if (execution->has_asserted())
- finishRunExecution(old);
if (!chosen_thread)
chosen_thread = get_next_thread();
- if (!chosen_thread || chosen_thread->is_model_thread())
- finishRunExecution(old);
+ 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(old);
- else
- startRunExecution(old);
+// if (should_terminate_execution())
+// finishRunExecution(th);
+// else
+ startRunExecution(th);
} else {
/* Consume the next action for a Thread */
consumeAction();
if (should_terminate_execution())
- finishRunExecution(old);
+ finishRunExecution(th);
else
- startRunExecution(old);
+ startRunExecution(th);
}
}
-
static void runChecker() {
model->run();
delete model;
void ModelChecker::startChecker() {
startExecution(get_system_context(), runChecker);
snapshot = take_snapshot();
+
+ install_trace_analyses(get_execution());
+ redirect_output();
initMainThread();
}
checkfree = params.checkthreshold;
for(int exec = 0;exec < params.maxexecutions;exec++) {
chosen_thread = init_thread;
- thread_chosen = false;
- curr_thread_num = 1;
- startRunExecution(&system_context);
+ break_execution = false;
+ do {
+ if (break_execution)
+ break;
+
+ 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