* under the terms of the license (GNU LGPL) which comes with this package. */
#include "src/mc/remote/CheckerSide.hpp"
-#include "src/mc/ModelChecker.hpp"
+#include "src/mc/explo/Exploration.hpp"
+#include "src/mc/explo/LivenessChecker.hpp"
#include "src/mc/sosp/RemoteProcessMemory.hpp"
#include "xbt/system_error.hpp"
+
#include <csignal>
+#include <sys/ptrace.h>
#include <sys/wait.h>
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_checkerside, mc, "MC communication with the application");
namespace simgrid::mc {
-CheckerSide::CheckerSide(int sockfd, ModelChecker* mc) : channel_(sockfd)
+CheckerSide::CheckerSide(int sockfd, pid_t pid) : channel_(sockfd), running_(true), pid_(pid)
{
auto* base = event_base_new();
base_.reset(base);
throw simgrid::xbt::errno_error();
}
- if (not mc_model_checker->handle_message(buffer.data(), size))
+ if (not checker->handle_message(buffer.data(), size))
checker->break_loop();
} else {
xbt_die("Unexpected event");
auto* signal_event = event_new(
base, SIGCHLD, EV_SIGNAL | EV_PERSIST,
[](evutil_socket_t sig, short events, void* arg) {
- auto mc = static_cast<simgrid::mc::ModelChecker*>(arg);
+ auto checker = static_cast<simgrid::mc::CheckerSide*>(arg);
if (events == EV_SIGNAL) {
if (sig == SIGCHLD)
- mc->handle_waitpid(mc->get_remote_process_memory().pid());
+ checker->handle_waitpid();
else
xbt_die("Unexpected signal: %d", sig);
} else {
xbt_die("Unexpected event");
}
},
- mc);
+ this);
event_add(signal_event, nullptr);
signal_event_.reset(signal_event);
}
event_base_loopbreak(base_.get());
}
+bool CheckerSide::handle_message(const char* buffer, ssize_t size)
+{
+ s_mc_message_t base_message;
+ xbt_assert(size >= (ssize_t)sizeof(base_message), "Broken message");
+ memcpy(&base_message, buffer, sizeof(base_message));
+
+ switch (base_message.type) {
+ case MessageType::INITIAL_ADDRESSES: {
+ s_mc_message_initial_addresses_t message;
+ xbt_assert(size == sizeof(message), "Broken message. Got %d bytes instead of %d.", (int)size,
+ (int)sizeof(message));
+ memcpy(&message, buffer, sizeof(message));
+ /* Create the memory address space, now that we have the mandatory information */
+ remote_memory_ = std::make_unique<simgrid::mc::RemoteProcessMemory>(pid_, message.mmalloc_default_mdp);
+ break;
+ }
+
+ case MessageType::IGNORE_HEAP: {
+ s_mc_message_ignore_heap_t message;
+ xbt_assert(size == sizeof(message), "Broken message");
+ memcpy(&message, buffer, sizeof(message));
+
+ IgnoredHeapRegion region;
+ region.block = message.block;
+ region.fragment = message.fragment;
+ region.address = message.address;
+ region.size = message.size;
+ get_remote_memory().ignore_heap(region);
+ break;
+ }
+
+ case MessageType::UNIGNORE_HEAP: {
+ s_mc_message_ignore_memory_t message;
+ xbt_assert(size == sizeof(message), "Broken message");
+ memcpy(&message, buffer, sizeof(message));
+ get_remote_memory().unignore_heap((void*)(std::uintptr_t)message.addr, message.size);
+ break;
+ }
+
+ case MessageType::IGNORE_MEMORY: {
+ s_mc_message_ignore_memory_t message;
+ xbt_assert(size == sizeof(message), "Broken message");
+ memcpy(&message, buffer, sizeof(message));
+ get_remote_memory().ignore_region(message.addr, message.size);
+ break;
+ }
+
+ case MessageType::STACK_REGION: {
+ s_mc_message_stack_region_t message;
+ xbt_assert(size == sizeof(message), "Broken message");
+ memcpy(&message, buffer, sizeof(message));
+ get_remote_memory().stack_areas().push_back(message.stack_region);
+ } break;
+
+ case MessageType::REGISTER_SYMBOL: {
+ s_mc_message_register_symbol_t message;
+ xbt_assert(size == sizeof(message), "Broken message");
+ memcpy(&message, buffer, sizeof(message));
+ xbt_assert(not message.callback, "Support for client-side function proposition is not implemented.");
+ XBT_DEBUG("Received symbol: %s", message.name.data());
+
+ LivenessChecker::automaton_register_symbol(get_remote_memory(), message.name.data(), remote((int*)message.data));
+ break;
+ }
+
+ case MessageType::WAITING:
+ return false;
+
+ case MessageType::ASSERTION_FAILED:
+ Exploration::get_instance()->report_assertion_failure();
+ break;
+
+ default:
+ xbt_die("Unexpected message from model-checked application");
+ }
+ return true;
+}
+
+void CheckerSide::clear_memory_cache()
+{
+ if (remote_memory_)
+ remote_memory_->clear_cache();
+}
+
+void CheckerSide::handle_waitpid()
+{
+ XBT_DEBUG("Check for wait event");
+ int status;
+ pid_t pid;
+ while ((pid = waitpid(-1, &status, WNOHANG)) != 0) {
+ if (pid == -1) {
+ if (errno == ECHILD) { // No more children:
+ xbt_assert(not this->running(), "Inconsistent state");
+ break;
+ } else {
+ XBT_ERROR("Could not wait for pid");
+ throw simgrid::xbt::errno_error();
+ }
+ }
+
+ if (pid == get_pid()) {
+ // From PTRACE_O_TRACEEXIT:
+#ifdef __linux__
+ if (status >> 8 == (SIGTRAP | (PTRACE_EVENT_EXIT << 8))) {
+ unsigned long eventmsg;
+ xbt_assert(ptrace(PTRACE_GETEVENTMSG, pid, 0, &eventmsg) != -1, "Could not get exit status");
+ status = static_cast<int>(eventmsg);
+ if (WIFSIGNALED(status)) {
+ this->terminate();
+ Exploration::get_instance()->report_crash(status);
+ }
+ }
+#endif
+
+ // We don't care about non-lethal signals, just reinject them:
+ if (WIFSTOPPED(status)) {
+ XBT_DEBUG("Stopped with signal %i", (int)WSTOPSIG(status));
+ errno = 0;
+#ifdef __linux__
+ ptrace(PTRACE_CONT, pid, 0, WSTOPSIG(status));
+#elif defined BSD
+ ptrace(PT_CONTINUE, pid, (caddr_t)1, WSTOPSIG(status));
+#endif
+ xbt_assert(errno == 0, "Could not PTRACE_CONT");
+ }
+
+ else if (WIFSIGNALED(status)) {
+ this->terminate();
+ Exploration::get_instance()->report_crash(status);
+ } else if (WIFEXITED(status)) {
+ XBT_DEBUG("Child process is over");
+ this->terminate();
+ }
+ }
+ }
+}
+
} // namespace simgrid::mc
