#include "history.h"
#include "bugmessage.h"
#include "params.h"
+#include "plugins.h"
ModelChecker *model = NULL;
-/** Wrapper to run the user's main function, with appropriate arguments */
-void user_main_wrapper(void *)
+void placeholder(void *) {
+ ASSERT(0);
+}
+
+#include <signal.h>
+
+#define SIGSTACKSIZE 65536
+static void mprot_handle_pf(int sig, siginfo_t *si, void *unused)
{
- user_main(model->params.argc, model->params.argv);
+ 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 */
params(),
- restart_flag(false),
scheduler(new Scheduler()),
- execution(new ModelExecution(this, scheduler)),
history(new ModelHistory()),
+ execution(new ModelExecution(this, scheduler)),
execution_number(1),
trace_analyses(),
inspect_plugin(NULL)
{
+ model_print("C11Tester\n"
+ "Copyright (c) 2013 and 2019 Regents of the University of California. All rights reserved.\n"
+ "Distributed under the GPLv2\n"
+ "Written by Weiyu Luo, Brian Norris, and Brian Demsky\n\n");
memset(&stats,0,sizeof(struct execution_stats));
- init_thread = new Thread(execution->get_next_id(), (thrd_t *) model_malloc(sizeof(thrd_t)), &user_main_wrapper, NULL, NULL); // L: user_main_wrapper passes the user program
+ init_thread = new Thread(execution->get_next_id(), (thrd_t *) model_malloc(sizeof(thrd_t)), &placeholder, NULL, NULL);
+#ifdef TLS
+ init_thread->setTLS((char *)get_tls_addr());
+#endif
execution->add_thread(init_thread);
scheduler->set_current_thread(init_thread);
+ register_plugins();
execution->setParams(¶ms);
param_defaults(¶ms);
+ parse_options(¶ms);
+ initRaceDetector();
+ /* Configure output redirection for the model-checker */
+ redirect_output();
+ install_trace_analyses(get_execution());
+ install_handler();
}
/** @brief Destructor */
for (unsigned int i = 0;i < get_num_threads();i++)
delete get_thread(int_to_id(i))->get_pending();
- snapshot_backtrack_before(0);
+ snapshot_roll_back(snapshot);
}
/** @return the number of user threads created during this execution */
* @param msg Descriptive message for the bug (do not include newline char)
* @return True if bug is immediately-feasible
*/
-bool ModelChecker::assert_bug(const char *msg, ...)
+void ModelChecker::assert_bug(const char *msg, ...)
{
char str[800];
vsnprintf(str, sizeof(str), msg, ap);
va_end(ap);
- return execution->assert_bug(str);
+ execution->assert_bug(str);
}
/**
void ModelChecker::assert_user_bug(const char *msg)
{
/* If feasible bug, bail out now */
- if (assert_bug(msg))
- switch_to_master(NULL);
+ assert_bug(msg);
+ switch_to_master(NULL);
}
/** @brief Print bug report listing for this execution (if any bugs exist) */
bugs->size(),
bugs->size() > 1 ? "s" : "");
for (unsigned int i = 0;i < bugs->size();i++)
- (*bugs)[i]->print();
+ (*bugs)[i] -> print();
}
/**
*/
void ModelChecker::record_stats()
{
- stats.num_total++;
- if (!execution->isfeasibleprefix())
- stats.num_infeasible++;
- else if (execution->have_bug_reports())
- stats.num_buggy_executions++;
+ stats.num_total ++;
+ if (execution->have_bug_reports())
+ stats.num_buggy_executions ++;
else if (execution->is_complete_execution())
- stats.num_complete++;
+ stats.num_complete ++;
else {
- stats.num_redundant++;
-
+ //All threads are sleeping
/**
* @todo We can violate this ASSERT() when fairness/sleep sets
* conflict to cause an execution to terminate, e.g. with:
void ModelChecker::print_stats() const
{
model_print("Number of complete, bug-free executions: %d\n", stats.num_complete);
- model_print("Number of redundant executions: %d\n", stats.num_redundant);
model_print("Number of buggy executions: %d\n", stats.num_buggy_executions);
- model_print("Number of infeasible executions: %d\n", stats.num_infeasible);
model_print("Total executions: %d\n", stats.num_total);
}
* @return If there are more executions to explore, return true. Otherwise,
* return false.
*/
-bool ModelChecker::next_execution()
+void ModelChecker::finish_execution(bool more_executions)
{
DBG();
/* Is this execution a feasible execution that's worth bug-checking? */
- bool complete = execution->isfeasibleprefix() &&
- (execution->is_complete_execution() ||
+ bool complete = (execution->is_complete_execution() ||
execution->have_bug_reports());
/* End-of-execution bug checks */
if (execution->is_deadlocked())
assert_bug("Deadlock detected");
- checkDataRaces();
run_trace_analyses();
}
else
clear_program_output();
- if (restart_flag) {
- do_restart();
- return true;
- }
// test code
- execution_number++;
- reset_to_initial_state();
- return false;
+ execution_number ++;
+ if (more_executions)
+ reset_to_initial_state();
+ history->set_new_exec_flag();
}
/** @brief Run trace analyses on complete trace */
void ModelChecker::run_trace_analyses() {
- for (unsigned int i = 0;i < trace_analyses.size();i++)
- trace_analyses[i]->analyze(execution->get_action_trace());
+ for (unsigned int i = 0;i < trace_analyses.size();i ++)
+ trace_analyses[i] -> analyze(execution->get_action_trace());
}
/**
*/
uint64_t ModelChecker::switch_to_master(ModelAction *act)
{
- if (forklock) {
+ if (modellock) {
static bool fork_message_printed = false;
if (!fork_message_printed) {
- model_print("Fork handler trying to call into model checker...\n");
+ model_print("Fork handler or dead thread trying to call into model checker...\n");
fork_message_printed = true;
}
delete act;
void ModelChecker::startChecker() {
startExecution(get_system_context(), runChecker);
+ snapshot = take_snapshot();
+ initMainThread();
}
bool ModelChecker::should_terminate_execution()
{
- /* Infeasible -> don't take any more steps */
- if (execution->is_infeasible())
- return true;
- else if (execution->isfeasibleprefix() && execution->have_bug_reports()) {
+ if (execution->have_bug_reports()) {
execution->set_assert();
return true;
- }
- return false;
-}
-
-/** @brief Restart ModelChecker upon returning to the run loop of the
- * model checker. */
-void ModelChecker::restart()
-{
- restart_flag = true;
-}
-
-void ModelChecker::do_restart()
-{
- restart_flag = false;
- reset_to_initial_state();
- memset(&stats,0,sizeof(struct execution_stats));
- execution_number = 1;
-}
-
-void ModelChecker::startMainThread() {
- init_thread->set_state(THREAD_RUNNING);
- scheduler->set_current_thread(init_thread);
- thread_startup();
-}
-
-static bool is_nonsc_write(const ModelAction *act) {
- if (act->get_type() == ATOMIC_WRITE) {
- std::memory_order order = act->get_mo();
- switch(order) {
- case std::memory_order_relaxed:
- case std::memory_order_release:
- return true;
- default:
- return false;
- }
+ } else if (execution->isFinished()) {
+ return true;
}
return false;
}
//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;
for(int exec = 0;exec < params.maxexecutions;exec++) {
Thread * t = init_thread;
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
*/
- ModelAction * pending;
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() && ((!(pending=thr->get_pending())) || is_nonsc_write(pending)) ) {
- switch_from_master(thr); // L: context swapped, and action type of thr changed.
+ 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);
}
t = get_next_thread();
if (!t || t->is_model_thread())
break;
+ if (t->just_woken_up()) {
+ t->set_wakeup_state(false);
+ t->set_pending(NULL);
+ t = NULL;
+ continue; // Allow this thread to stash the next pending action
+ }
/* Consume the next action for a Thread */
ModelAction *curr = t->get_pending();
t->set_pending(NULL);
t = execution->take_step(curr);
} while (!should_terminate_execution());
- next_execution();
+ finish_execution((exec+1) < params.maxexecutions);
//restore random number generator state after rollback
setstate(random_state);
}
/* Have the trace analyses dump their output. */
for (unsigned int i = 0;i < trace_analyses.size();i++)
trace_analyses[i]->finish();
+
+ /* unlink tmp file created by last child process */
+ char filename[256];
+ snprintf_(filename, sizeof(filename), "C11FuzzerTmp%d", getpid());
+ unlink(filename);
}
projects / c11tester.git / blobdiff