+ModelChecker::ModelChecker(std::unique_ptr<RemoteClient> process)
+ : base_(nullptr)
+ , socket_event_(nullptr)
+ , signal_event_(nullptr)
+ , page_store_(500)
+ , process_(std::move(process))
+ , parent_snapshot_(nullptr)
+{
+
+}
+
+ModelChecker::~ModelChecker() {
+ if (socket_event_ != nullptr)
+ event_free(socket_event_);
+ if (signal_event_ != nullptr)
+ event_free(signal_event_);
+ if (base_ != nullptr)
+ event_base_free(base_);
+}
+
+void ModelChecker::start()
+{
+ const pid_t pid = process_->pid();
+
+ base_ = event_base_new();
+ event_callback_fn event_callback = [](evutil_socket_t fd, short events, void *arg)
+ {
+ ((ModelChecker *)arg)->handle_events(fd, events);
+ };
+ socket_event_ = event_new(base_,
+ process_->getChannel().getSocket(),
+ EV_READ|EV_PERSIST,
+ event_callback, this);
+ event_add(socket_event_, NULL);
+ signal_event_ = event_new(base_,
+ SIGCHLD,
+ EV_SIGNAL|EV_PERSIST,
+ event_callback, this);
+ event_add(signal_event_, NULL);
+
+ XBT_DEBUG("Waiting for the model-checked process");
+ int status;
+
+ // The model-checked process SIGSTOP itself to signal it's ready:
+ pid_t res = waitpid(pid, &status, WAITPID_CHECKED_FLAGS);
+ if (res < 0 || not WIFSTOPPED(status) || WSTOPSIG(status) != SIGSTOP)
+ xbt_die("Could not wait model-checked process");
+
+ process_->init();
+
+ if (not _sg_mc_dot_output_file.empty())
+ MC_init_dot_output();
+
+ setup_ignore();
+
+#ifdef __linux__
+ ptrace(PTRACE_SETOPTIONS, pid, nullptr, PTRACE_O_TRACEEXIT);
+ ptrace(PTRACE_CONT, pid, 0, 0);
+#elif defined BSD
+ ptrace(PT_CONTINUE, pid, (caddr_t)1, 0);
+#else
+# error "no ptrace equivalent coded for this platform"
+#endif
+}
+
+static const std::pair<const char*, const char*> ignored_local_variables[] = {
+ std::pair<const char*, const char*>{ "e", "*" },
+ std::pair<const char*, const char*>{ "__ex_cleanup", "*" },
+ std::pair<const char*, const char*>{ "__ex_mctx_en", "*" },
+ std::pair<const char*, const char*>{ "__ex_mctx_me", "*" },
+ std::pair<const char*, const char*>{ "__xbt_ex_ctx_ptr", "*" },
+ std::pair<const char*, const char*>{ "_log_ev", "*" },
+ std::pair<const char*, const char*>{ "_throw_ctx", "*" },
+ std::pair<const char*, const char*>{ "ctx", "*" },
+
+ std::pair<const char*, const char*>{ "self", "simcall_BODY_mc_snapshot" },
+ std::pair<const char*, const char*>{ "next_context", "smx_ctx_sysv_suspend_serial" },
+ std::pair<const char*, const char*>{ "i", "smx_ctx_sysv_suspend_serial" },
+
+ /* Ignore local variable about time used for tracing */
+ std::pair<const char*, const char*>{ "start_time", "*" },
+};
+
+void ModelChecker::setup_ignore()
+{
+ RemoteClient& process = this->process();
+ for (std::pair<const char*, const char*> const& var :
+ ignored_local_variables)
+ process.ignore_local_variable(var.first, var.second);
+
+ /* Static variable used for tracing */
+ process.ignore_global_variable("counter");
+}
+
+void ModelChecker::shutdown()
+{
+ XBT_DEBUG("Shuting down model-checker");
+
+ simgrid::mc::RemoteClient* process = &this->process();
+ if (process->running()) {
+ XBT_DEBUG("Killing process");
+ kill(process->pid(), SIGKILL);
+ process->terminate();
+ }
+}
+
+void ModelChecker::resume(simgrid::mc::RemoteClient& process)
+{
+ int res = process.getChannel().send(MC_MESSAGE_CONTINUE);
+ if (res)
+ throw simgrid::xbt::errno_error();
+ process.clear_cache();
+}
+
+static void MC_report_crash(int status)
+{
+ XBT_INFO("**************************");
+ XBT_INFO("** CRASH IN THE PROGRAM **");
+ XBT_INFO("**************************");
+ if (WIFSIGNALED(status))
+ XBT_INFO("From signal: %s", strsignal(WTERMSIG(status)));
+ else if (WIFEXITED(status))
+ XBT_INFO("From exit: %i", WEXITSTATUS(status));
+ if (WCOREDUMP(status))
+ XBT_INFO("A core dump was generated by the system.");
+ else
+ XBT_INFO("No core dump was generated by the system.");
+ XBT_INFO("Counter-example execution trace:");
+ simgrid::mc::dumpRecordPath();
+ for (auto const& s : mc_model_checker->getChecker()->getTextualTrace())
+ XBT_INFO("%s", s.c_str());
+ simgrid::mc::session->logState();
+ XBT_INFO("Stack trace:");
+ mc_model_checker->process().dumpStack();
+}
+
+static void MC_report_assertion_error()
+{
+ XBT_INFO("**************************");
+ XBT_INFO("*** PROPERTY NOT VALID ***");
+ XBT_INFO("**************************");
+ XBT_INFO("Counter-example execution trace:");
+ simgrid::mc::dumpRecordPath();
+ for (auto const& s : mc_model_checker->getChecker()->getTextualTrace())
+ XBT_INFO("%s", s.c_str());
+ simgrid::mc::session->logState();
+}
+
+bool ModelChecker::handle_message(char* buffer, ssize_t size)
+{
+ s_mc_message_t base_message;
+ if (size < (ssize_t) sizeof(base_message))
+ xbt_die("Broken message");
+ memcpy(&base_message, buffer, sizeof(base_message));
+
+ switch(base_message.type) {
+
+ case MC_MESSAGE_IGNORE_HEAP:
+ {
+ s_mc_message_ignore_heap_t message;
+ if (size != sizeof(message))
+ xbt_die("Broken messsage");
+ memcpy(&message, buffer, sizeof(message));
+
+ IgnoredHeapRegion region;
+ region.block = message.block;
+ region.fragment = message.fragment;
+ region.address = message.address;
+ region.size = message.size;
+ process().ignore_heap(region);
+ break;
+ }
+
+ case MC_MESSAGE_UNIGNORE_HEAP:
+ {
+ s_mc_message_ignore_memory_t message;
+ if (size != sizeof(message))
+ xbt_die("Broken messsage");
+ memcpy(&message, buffer, sizeof(message));
+ process().unignore_heap((void*)(std::uintptr_t)message.addr, message.size);
+ break;
+ }
+
+ case MC_MESSAGE_IGNORE_MEMORY:
+ {
+ s_mc_message_ignore_memory_t message;
+ if (size != sizeof(message))
+ xbt_die("Broken messsage");
+ memcpy(&message, buffer, sizeof(message));
+ this->process().ignore_region(message.addr, message.size);
+ break;
+ }
+
+ case MC_MESSAGE_STACK_REGION:
+ {
+ s_mc_message_stack_region_t message;
+ if (size != sizeof(message))
+ xbt_die("Broken messsage");
+ memcpy(&message, buffer, sizeof(message));
+ this->process().stack_areas().push_back(message.stack_region);
+ }
+ break;
+
+ case MC_MESSAGE_REGISTER_SYMBOL:
+ {
+ s_mc_message_register_symbol_t message;
+ if (size != sizeof(message))
+ xbt_die("Broken message");
+ memcpy(&message, buffer, sizeof(message));
+ if (message.callback)
+ xbt_die("Support for client-side function proposition is not implemented.");
+ XBT_DEBUG("Received symbol: %s", message.name);
+
+ if (simgrid::mc::property_automaton == nullptr)
+ simgrid::mc::property_automaton = xbt_automaton_new();
+
+ simgrid::mc::RemoteClient* process = &this->process();
+ simgrid::mc::RemotePtr<int> address = simgrid::mc::remote((int*)message.data);
+ simgrid::xbt::add_proposition(simgrid::mc::property_automaton, message.name,
+ [process, address]() { return process->read(address); });
+
+ break;
+ }
+
+ case MC_MESSAGE_WAITING:
+ return false;
+
+ case MC_MESSAGE_ASSERTION_FAILED:
+ MC_report_assertion_error();
+ this->exit(SIMGRID_MC_EXIT_SAFETY);
+ break;
+
+ default:
+ xbt_die("Unexpected message from model-checked application");
+
+ }
+ return true;
+}
+
+/** Terminate the model-checker application */
+void ModelChecker::exit(int status)
+{
+ // TODO, terminate the model checker politely instead of exiting rudely
+ if (process().running())
+ kill(process().pid(), SIGKILL);
+ ::exit(status);
+}
+
+void ModelChecker::handle_events(int fd, short events)