X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/369179f3c31aef08145ac49d3af8b44df749ffae..d0a8cb4f92bd372f091430671bd30f4422674d76:/src/mc/remote/AppSide.cpp diff --git a/src/mc/remote/AppSide.cpp b/src/mc/remote/AppSide.cpp index 80e4c5230a..a74b1260d9 100644 --- a/src/mc/remote/AppSide.cpp +++ b/src/mc/remote/AppSide.cpp @@ -11,25 +11,29 @@ #include "src/kernel/actor/SimcallObserver.hpp" #include "src/mc/mc_base.hpp" #include "src/mc/mc_config.hpp" -#include "src/mc/remote/RemoteProcess.hpp" +#include "src/mc/mc_environ.h" +#if SIMGRID_HAVE_STATEFUL_MC +#include "src/mc/sosp/RemoteProcessMemory.hpp" +#endif #if HAVE_SMPI #include "src/smpi/include/private.hpp" #endif #include "src/sthread/sthread.h" -#include "xbt/coverage.h" +#include "src/xbt/coverage.h" #include "xbt/str.h" -#include "xbt/xbt_modinter.h" /* mmalloc_preinit to get the default mmalloc arena address */ #include #include +#include #include // setvbuf #include -#include #include #include #include #include #include +#include +#include XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_client, mc, "MC client logic"); XBT_LOG_EXTERNAL_CATEGORY(mc_global); @@ -38,16 +42,18 @@ namespace simgrid::mc { std::unique_ptr AppSide::instance_; -AppSide* AppSide::initialize() +AppSide* AppSide::get() { - if (not std::getenv(MC_ENV_SOCKET_FD)) // We are not in MC mode: don't initialize the MC world + // Only initialize the MC world once + if (instance_ != nullptr) + return instance_.get(); + + if (std::getenv(MC_ENV_SOCKET_FD) == nullptr) // We are not in MC mode: don't initialize the MC world return nullptr; - // Do not break if we are called multiple times: - if (instance_) - return instance_.get(); + XBT_DEBUG("Initialize the MC world. %s=%s", MC_ENV_NEED_PTRACE, std::getenv(MC_ENV_NEED_PTRACE)); - simgrid::mc::cfg_do_model_check = true; + simgrid::mc::set_model_checking_mode(ModelCheckingMode::APP_SIDE); setvbuf(stdout, nullptr, _IOLBF, 0); @@ -56,30 +62,22 @@ AppSide* AppSide::initialize() int fd = xbt_str_parse_int(fd_env, "Not a number in variable '" MC_ENV_SOCKET_FD "'"); XBT_DEBUG("Model-checked application found socket FD %i", fd); - // Check the socket type/validity: - int type; - socklen_t socklen = sizeof(type); - xbt_assert(getsockopt(fd, SOL_SOCKET, SO_TYPE, &type, &socklen) == 0, "Could not check socket type"); - xbt_assert(type == SOCK_SEQPACKET, "Unexpected socket type %i", type); - XBT_DEBUG("Model-checked application found expected socket type"); - instance_ = std::make_unique(fd); // Wait for the model-checker: - errno = 0; + if (getenv(MC_ENV_NEED_PTRACE) != nullptr) { + errno = 0; #if defined __linux__ - ptrace(PTRACE_TRACEME, 0, nullptr, nullptr); + ptrace(PTRACE_TRACEME, 0, nullptr, nullptr); #elif defined BSD - ptrace(PT_TRACE_ME, 0, nullptr, 0); + ptrace(PT_TRACE_ME, 0, nullptr, 0); #else -#error "no ptrace equivalent coded for this platform" + xbt_die("no ptrace equivalent coded for this platform, please don't use the liveness checker here."); #endif - xbt_assert(errno == 0 && raise(SIGSTOP) == 0, "Could not wait for the model-checker (errno = %d: %s)", errno, - strerror(errno)); - s_mc_message_initial_addresses_t message{MessageType::INITIAL_ADDRESSES, mmalloc_get_current_heap(), - kernel::actor::ActorImpl::get_maxpid_addr()}; - xbt_assert(instance_->channel_.send(message) == 0, "Could not send the initial message with addresses."); + xbt_assert(errno == 0 && raise(SIGSTOP) == 0, "Could not wait for the model-checker (errno = %d: %s)", errno, + strerror(errno)); + } instance_->handle_messages(); return instance_.get(); @@ -100,8 +98,10 @@ void AppSide::handle_deadlock_check(const s_mc_message_t*) const engine->display_all_actor_status(); } // Send result: - s_mc_message_int_t answer{MessageType::DEADLOCK_CHECK_REPLY, deadlock}; - xbt_assert(channel_.send(answer) == 0, "Could not send response"); + s_mc_message_int_t answer = {}; + answer.type = MessageType::DEADLOCK_CHECK_REPLY; + answer.value = deadlock; + xbt_assert(channel_.send(answer) == 0, "Could not send response: %s", strerror(errno)); } void AppSide::handle_simcall_execute(const s_mc_message_simcall_execute_t* message) const { @@ -111,12 +111,12 @@ void AppSide::handle_simcall_execute(const s_mc_message_simcall_execute_t* messa // The client may send some messages to the server while processing the transition actor->simcall_handle(message->times_considered_); // Say the server that the transition is over and that it should proceed - xbt_assert(channel_.send(MessageType::WAITING) == 0, "Could not send MESSAGE_WAITING to model-checker"); + xbt_assert(channel_.send(MessageType::WAITING) == 0, "Could not send MESSAGE_WAITING to model-checker: %s", + strerror(errno)); // Finish the RPC from the server: return a serialized observer, to build a Transition on Checker side - s_mc_message_simcall_execute_answer_t answer; - memset(&answer, 0, sizeof(answer)); - answer.type = MessageType::SIMCALL_EXECUTE_ANSWER; + s_mc_message_simcall_execute_answer_t answer = {}; + answer.type = MessageType::SIMCALL_EXECUTE_REPLY; std::stringstream stream; if (actor->simcall_.observer_ != nullptr) { actor->simcall_.observer_->serialize(stream); @@ -130,7 +130,7 @@ void AppSide::handle_simcall_execute(const s_mc_message_simcall_execute_t* messa answer.buffer.back() = '\0'; XBT_DEBUG("send SIMCALL_EXECUTE_ANSWER(%s) ~> '%s'", actor->get_cname(), str.c_str()); - xbt_assert(channel_.send(answer) == 0, "Could not send response"); + xbt_assert(channel_.send(answer) == 0, "Could not send response: %s", strerror(errno)); } void AppSide::handle_finalize(const s_mc_message_int_t* msg) const @@ -147,107 +147,178 @@ void AppSide::handle_finalize(const s_mc_message_int_t* msg) const #endif } coverage_checkpoint(); - xbt_assert(channel_.send(MessageType::FINALIZE_REPLY) == 0, "Could not answer to FINALIZE"); + xbt_assert(channel_.send(MessageType::FINALIZE_REPLY) == 0, "Could not answer to FINALIZE: %s", strerror(errno)); std::fflush(stdout); if (terminate_asap) ::_Exit(0); } +void AppSide::handle_fork(const s_mc_message_fork_t* msg) +{ + int status; + int pid; + /* Reap any zombie child, saving its status for later use in AppSide::handle_wait_child() */ + while ((pid = waitpid(-1, &status, WNOHANG)) > 0) + child_statuses_[pid] = status; + + pid = fork(); + xbt_assert(pid >= 0, "Could not fork application sub-process: %s.", strerror(errno)); + + if (pid == 0) { // Child + int sock = socket(AF_UNIX, +#ifdef __APPLE__ + SOCK_STREAM, /* Mac OSX does not have AF_UNIX + SOCK_SEQPACKET, even if that's faster*/ +#else + SOCK_SEQPACKET, +#endif + 0); + + struct sockaddr_un addr = {}; + addr.sun_family = AF_UNIX; + std::copy_n(begin(msg->socket_name), MC_SOCKET_NAME_LEN, addr.sun_path); + + xbt_assert(connect(sock, (struct sockaddr*)&addr, sizeof addr) >= 0, "Cannot connect to Checker on %c%s: %s.", + (addr.sun_path[0] ? addr.sun_path[0] : '@'), addr.sun_path + 1, strerror(errno)); + + channel_.reset_socket(sock); + + s_mc_message_int_t answer = {}; + answer.type = MessageType::FORK_REPLY; + answer.value = getpid(); + xbt_assert(channel_.send(answer) == 0, "Could not send response to WAIT_CHILD_REPLY: %s", strerror(errno)); + } else { + XBT_VERB("App %d forks subprocess %d.", getpid(), pid); + } +} +void AppSide::handle_wait_child(const s_mc_message_int_t* msg) +{ + int status; + errno = 0; + if (auto search = child_statuses_.find(msg->value); search != child_statuses_.end()) { + status = search->second; + child_statuses_.erase(search); // We only need this info once + } else { + waitpid(msg->value, &status, 0); + } + xbt_assert(errno == 0, "Cannot wait on behalf of the checker: %s.", strerror(errno)); + + s_mc_message_int_t answer = {}; + answer.type = MessageType::WAIT_CHILD_REPLY; + answer.value = status; + xbt_assert(channel_.send(answer) == 0, "Could not send response to WAIT_CHILD: %s", strerror(errno)); +} +void AppSide::handle_need_meminfo() +{ +#if SIMGRID_HAVE_STATEFUL_MC + this->need_memory_info_ = true; + s_mc_message_need_meminfo_reply_t answer = {}; + answer.type = MessageType::NEED_MEMINFO_REPLY; + answer.mmalloc_default_mdp = mmalloc_get_current_heap(); + xbt_assert(channel_.send(answer) == 0, "Could not send response to the request for meminfo: %s", strerror(errno)); +#else + xbt_die("SimGrid was compiled without MC suppport, so liveness and similar features are not available."); +#endif +} void AppSide::handle_actors_status() const { auto const& actor_list = kernel::EngineImpl::get_instance()->get_actor_list(); - const int num_actors = actor_list.size(); - XBT_DEBUG("Serialize the actors to answer ACTORS_STATUS from the checker. %d actors to go.", num_actors); - - std::vector status(num_actors); - int i = 0; - int total_transitions = 0; + XBT_DEBUG("Serialize the actors to answer ACTORS_STATUS from the checker. %zu actors to go.", actor_list.size()); + std::vector status; for (auto const& [aid, actor] : actor_list) { - status[i].aid = aid; - status[i].enabled = mc::actor_is_enabled(actor); - status[i].max_considered = actor->simcall_.observer_->get_max_consider(); - status[i].n_transitions = mc::actor_is_enabled(actor) ? status[i].max_considered : 0; - total_transitions += status[i].n_transitions; - i++; + xbt_assert(actor); + xbt_assert(actor->simcall_.observer_, "simcall %s in actor %s has no observer.", actor->simcall_.get_cname(), + actor->get_cname()); + s_mc_message_actors_status_one_t one = {}; + one.type = MessageType::ACTORS_STATUS_REPLY_TRANSITION; + one.aid = aid; + one.enabled = mc::actor_is_enabled(actor); + one.max_considered = actor->simcall_.observer_->get_max_consider(); + status.push_back(one); } - struct s_mc_message_actors_status_answer_t answer { - MessageType::ACTORS_STATUS_REPLY, num_actors, total_transitions - }; + struct s_mc_message_actors_status_answer_t answer = {}; + answer.type = MessageType::ACTORS_STATUS_REPLY_COUNT; + answer.count = static_cast(status.size()); - xbt_assert(channel_.send(answer) == 0, "Could not send ACTORS_STATUS_REPLY msg"); + xbt_assert(channel_.send(answer) == 0, "Could not send ACTORS_STATUS_REPLY msg: %s", strerror(errno)); if (answer.count > 0) { size_t size = status.size() * sizeof(s_mc_message_actors_status_one_t); - xbt_assert(channel_.send(status.data(), size) == 0, "Could not send ACTORS_STATUS_REPLY data"); + xbt_assert(channel_.send(status.data(), size) == 0, "Could not send ACTORS_STATUS_REPLY data: %s", strerror(errno)); } // Serialize each transition to describe what each actor is doing - if (total_transitions > 0) { - std::vector probes(total_transitions); - auto probes_iter = probes.begin(); - - for (const auto& actor_status : status) { - if (not actor_status.enabled) - continue; - - const auto& actor = actor_list.at(actor_status.aid); - const int max_considered = actor_status.max_considered; - - for (int times_considered = 0; times_considered < max_considered; times_considered++, probes_iter++) { - std::stringstream stream; - s_mc_message_simcall_probe_one_t& probe = *probes_iter; - - if (actor->simcall_.observer_ != nullptr) { - actor->simcall_.observer_->prepare(times_considered); - actor->simcall_.observer_->serialize(stream); - } else { - stream << (short)mc::Transition::Type::UNKNOWN; - } - - std::string str = stream.str(); - xbt_assert(str.size() + 1 <= probe.buffer.size(), - "The serialized transition is too large for the buffer. Please fix the code."); - strncpy(probe.buffer.data(), str.c_str(), probe.buffer.size() - 1); - probe.buffer.back() = '\0'; + XBT_DEBUG("Deliver ACTOR_TRANSITION_PROBE payload"); + for (const auto& actor_status : status) { + const auto& actor = actor_list.at(actor_status.aid); + const int max_considered = actor_status.max_considered; + + for (int times_considered = 0; times_considered < max_considered; times_considered++) { + std::stringstream stream; + s_mc_message_simcall_probe_one_t probe; + probe.type = MessageType::ACTORS_STATUS_REPLY_SIMCALL; + + if (actor->simcall_.observer_ != nullptr) { + actor->simcall_.observer_->prepare(times_considered); + actor->simcall_.observer_->serialize(stream); + } else { + stream << (short)mc::Transition::Type::UNKNOWN; } - // NOTE: We do NOT need to reset `times_considered` for each actor's - // simcall observer here to the "original" value (i.e. the value BEFORE - // multiple prepare() calls were made for serialization purposes) since - // each SIMCALL_EXECUTE provides a `times_considered` to be used to prepare - // the transition before execution. - } - size_t size = probes.size() * sizeof(s_mc_message_simcall_probe_one_t); - XBT_DEBUG("Deliver ACTOR_TRANSITION_PROBE payload"); - xbt_assert(channel_.send(probes.data(), size) == 0, "Could not send ACTOR_TRANSITION_PROBE payload"); + std::string str = stream.str(); + xbt_assert(str.size() + 1 <= probe.buffer.size(), + "The serialized transition is too large for the buffer. Please fix the code."); + strncpy(probe.buffer.data(), str.c_str(), probe.buffer.size() - 1); + probe.buffer.back() = '\0'; + + XBT_DEBUG("send ACTOR_TRANSITION_PROBE(%s) ~> '%s'", actor->get_cname(), str.c_str()); + xbt_assert(channel_.send(probe) == 0, "Could not send ACTOR_TRANSITION_PROBE payload: %s", strerror(errno)); + } + // NOTE: We do NOT need to reset `times_considered` for each actor's + // simcall observer here to the "original" value (i.e. the value BEFORE + // multiple prepare() calls were made for serialization purposes) since + // each SIMCALL_EXECUTE provides a `times_considered` to be used to prepare + // the transition before execution. } } +void AppSide::handle_actors_maxpid() const +{ + s_mc_message_int_t answer = {}; + answer.type = MessageType::ACTORS_MAXPID_REPLY; + answer.value = kernel::actor::ActorImpl::get_maxpid(); + xbt_assert(channel_.send(answer) == 0, "Could not send response: %s", strerror(errno)); +} #define assert_msg_size(_name_, _type_) \ xbt_assert(received_size == sizeof(_type_), "Unexpected size for " _name_ " (%zd != %zu)", received_size, \ sizeof(_type_)) -void AppSide::handle_messages() const +void AppSide::handle_messages() { while (true) { // Until we get a CONTINUE message - XBT_DEBUG("Waiting messages from model-checker"); + XBT_DEBUG("Waiting messages from the model-checker"); std::array message_buffer; ssize_t received_size = channel_.receive(message_buffer.data(), message_buffer.size()); - xbt_assert(received_size >= 0, "Could not receive commands from the model-checker"); + if (received_size == 0) { + XBT_DEBUG("Socket closed on the Checker side, bailing out."); + ::_Exit(0); // Nobody's listening to that process anymore => exit as quickly as possible. + } + xbt_assert(received_size >= 0, "Could not receive commands from the model-checker: %s", strerror(errno)); + xbt_assert(static_cast(received_size) >= sizeof(s_mc_message_t), "Cannot handle short message (size=%zd)", + received_size); const s_mc_message_t* message = (s_mc_message_t*)message_buffer.data(); switch (message->type) { + case MessageType::CONTINUE: + assert_msg_size("MESSAGE_CONTINUE", s_mc_message_t); + return; + case MessageType::DEADLOCK_CHECK: assert_msg_size("DEADLOCK_CHECK", s_mc_message_t); handle_deadlock_check(message); break; - case MessageType::CONTINUE: - assert_msg_size("MESSAGE_CONTINUE", s_mc_message_t); - return; - case MessageType::SIMCALL_EXECUTE: assert_msg_size("SIMCALL_EXECUTE", s_mc_message_simcall_execute_t); handle_simcall_execute((s_mc_message_simcall_execute_t*)message_buffer.data()); @@ -258,11 +329,31 @@ void AppSide::handle_messages() const handle_finalize((s_mc_message_int_t*)message_buffer.data()); break; + case MessageType::FORK: + assert_msg_size("FORK", s_mc_message_fork_t); + handle_fork((s_mc_message_fork_t*)message_buffer.data()); + break; + + case MessageType::WAIT_CHILD: + assert_msg_size("WAIT_CHILD", s_mc_message_int_t); + handle_wait_child((s_mc_message_int_t*)message_buffer.data()); + break; + + case MessageType::NEED_MEMINFO: + assert_msg_size("NEED_MEMINFO", s_mc_message_t); + handle_need_meminfo(); + break; + case MessageType::ACTORS_STATUS: assert_msg_size("ACTORS_STATUS", s_mc_message_t); handle_actors_status(); break; + case MessageType::ACTORS_MAXPID: + assert_msg_size("ACTORS_MAXPID", s_mc_message_t); + handle_actors_maxpid(); + break; + default: xbt_die("Received unexpected message %s (%i)", to_c_str(message->type), static_cast(message->type)); break; @@ -270,48 +361,73 @@ void AppSide::handle_messages() const } } -void AppSide::main_loop() const +void AppSide::main_loop() { simgrid::mc::processes_time.resize(simgrid::kernel::actor::ActorImpl::get_maxpid()); MC_ignore_heap(simgrid::mc::processes_time.data(), simgrid::mc::processes_time.size() * sizeof(simgrid::mc::processes_time[0])); + kernel::activity::CommImpl::setup_mc(); sthread_disable(); coverage_checkpoint(); sthread_enable(); while (true) { simgrid::mc::execute_actors(); - xbt_assert(channel_.send(MessageType::WAITING) == 0, "Could not send WAITING message to model-checker"); + xbt_assert(channel_.send(MessageType::WAITING) == 0, "Could not send WAITING message to model-checker: %s", + strerror(errno)); this->handle_messages(); } } -void AppSide::report_assertion_failure() const +void AppSide::report_assertion_failure() { - xbt_assert(channel_.send(MessageType::ASSERTION_FAILED) == 0, "Could not send assertion to model-checker"); + xbt_assert(channel_.send(MessageType::ASSERTION_FAILED) == 0, "Could not send assertion to model-checker: %s", + strerror(errno)); this->handle_messages(); } void AppSide::ignore_memory(void* addr, std::size_t size) const { - if (not MC_is_active()) + if (not MC_is_active() || not need_memory_info_) return; - s_mc_message_ignore_memory_t message; +#if SIMGRID_HAVE_STATEFUL_MC + s_mc_message_ignore_memory_t message = {}; message.type = MessageType::IGNORE_MEMORY; message.addr = (std::uintptr_t)addr; message.size = size; - xbt_assert(channel_.send(message) == 0, "Could not send IGNORE_MEMORY message to model-checker"); + xbt_assert(channel_.send(message) == 0, "Could not send IGNORE_MEMORY message to model-checker: %s", strerror(errno)); +#else + xbt_die("Cannot really call ignore_memory() in non-SIMGRID_MC mode."); +#endif +} + +void AppSide::unignore_memory(void* addr, std::size_t size) const +{ + if (not MC_is_active() || not need_memory_info_) + return; + +#if SIMGRID_HAVE_STATEFUL_MC + s_mc_message_ignore_memory_t message = {}; + message.type = MessageType::UNIGNORE_MEMORY; + message.addr = (std::uintptr_t)addr; + message.size = size; + xbt_assert(channel_.send(message) == 0, "Could not send UNIGNORE_MEMORY message to model-checker: %s", + strerror(errno)); +#else + xbt_die("Cannot really call unignore_memory() in non-SIMGRID_MC mode."); +#endif } void AppSide::ignore_heap(void* address, std::size_t size) const { - if (not MC_is_active()) + if (not MC_is_active() || not need_memory_info_) return; +#if SIMGRID_HAVE_STATEFUL_MC const s_xbt_mheap_t* heap = mmalloc_get_current_heap(); - s_mc_message_ignore_heap_t message; + s_mc_message_ignore_heap_t message = {}; message.type = MessageType::IGNORE_HEAP; message.address = address; message.size = size; @@ -324,34 +440,46 @@ void AppSide::ignore_heap(void* address, std::size_t size) const heap->heapinfo[message.block].busy_frag.ignore[message.fragment]++; } - xbt_assert(channel_.send(message) == 0, "Could not send ignored region to MCer"); + xbt_assert(channel_.send(message) == 0, "Could not send ignored region to MCer: %s", strerror(errno)); +#else + xbt_die("Cannot really call ignore_heap() in non-SIMGRID_MC mode."); +#endif } void AppSide::unignore_heap(void* address, std::size_t size) const { - if (not MC_is_active()) + if (not MC_is_active() || not need_memory_info_) return; - s_mc_message_ignore_memory_t message; +#if SIMGRID_HAVE_STATEFUL_MC + s_mc_message_ignore_memory_t message = {}; message.type = MessageType::UNIGNORE_HEAP; message.addr = (std::uintptr_t)address; message.size = size; - xbt_assert(channel_.send(message) == 0, "Could not send IGNORE_HEAP message to model-checker"); + xbt_assert(channel_.send(message) == 0, "Could not send IGNORE_HEAP message to model-checker: %s", strerror(errno)); +#else + xbt_die("Cannot really call unignore_heap() in non-SIMGRID_MC mode."); +#endif } void AppSide::declare_symbol(const char* name, int* value) const { - if (not MC_is_active()) + if (not MC_is_active() || not need_memory_info_) { + XBT_CRITICAL("Ignore AppSide::declare_symbol(%s)", name); return; + } - s_mc_message_register_symbol_t message; - memset(&message, 0, sizeof(message)); +#if SIMGRID_HAVE_STATEFUL_MC + s_mc_message_register_symbol_t message = {}; message.type = MessageType::REGISTER_SYMBOL; xbt_assert(strlen(name) + 1 <= message.name.size(), "Symbol is too long"); strncpy(message.name.data(), name, message.name.size() - 1); message.callback = nullptr; message.data = value; - xbt_assert(channel_.send(message) == 0, "Could send REGISTER_SYMBOL message to model-checker"); + xbt_assert(channel_.send(message) == 0, "Could send REGISTER_SYMBOL message to model-checker: %s", strerror(errno)); +#else + xbt_die("Cannot really call declare_symbol() in non-SIMGRID_MC mode."); +#endif } /** Register a stack in the model checker @@ -360,23 +488,29 @@ void AppSide::declare_symbol(const char* name, int* value) const * when we analyze/compare the content of the heap so it must be told where * they are with this function. */ +#if HAVE_UCONTEXT_H /* Apple don't want us to use ucontexts */ void AppSide::declare_stack(void* stack, size_t size, ucontext_t* context) const { - if (not MC_is_active()) + if (not MC_is_active() || not need_memory_info_) return; +#if SIMGRID_HAVE_STATEFUL_MC const s_xbt_mheap_t* heap = mmalloc_get_current_heap(); - s_stack_region_t region; - memset(®ion, 0, sizeof(region)); + s_stack_region_t region = {}; region.address = stack; region.context = context; region.size = size; region.block = ((char*)stack - (char*)heap->heapbase) / BLOCKSIZE + 1; - s_mc_message_stack_region_t message; + s_mc_message_stack_region_t message = {}; message.type = MessageType::STACK_REGION; message.stack_region = region; - xbt_assert(channel_.send(message) == 0, "Could not send STACK_REGION to model-checker"); + xbt_assert(channel_.send(message) == 0, "Could not send STACK_REGION to model-checker: %s", strerror(errno)); +#else + xbt_die("Cannot really call declare_stack() in non-SIMGRID_MC mode."); +#endif } +#endif + } // namespace simgrid::mc