src/mc/api.cpp

   1 /* Copyright (c) 2020-2022. The SimGrid Team. All rights reserved.          */
   2
   3 /* This program is free software; you can redistribute it and/or modify it
   4  * under the terms of the license (GNU LGPL) which comes with this package. */
   5
   6 #include "api.hpp"
   7
   8 #include "src/kernel/activity/MailboxImpl.hpp"
   9 #include "src/kernel/activity/MutexImpl.hpp"
  10 #include "src/kernel/actor/SimcallObserver.hpp"
  11 #include "src/mc/Session.hpp"
  12 #include "src/mc/checker/Checker.hpp"
  13 #include "src/mc/mc_base.hpp"
  14 #include "src/mc/mc_comm_pattern.hpp"
  15 #include "src/mc/mc_exit.hpp"
  16 #include "src/mc/mc_pattern.hpp"
  17 #include "src/mc/mc_private.hpp"
  18 #include "src/mc/remote/RemoteProcess.hpp"
  19 #include "src/surf/HostImpl.hpp"
  20
  21 #include <xbt/asserts.h>
  22 #include <xbt/log.h>
  23 #include "simgrid/s4u/Host.hpp"
  24 #include "xbt/string.hpp"
  25 #if HAVE_SMPI
  26 #include "src/smpi/include/smpi_request.hpp"
  27 #endif
  28
  29 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(Api, mc, "Logging specific to MC Facade APIs ");
  30 XBT_LOG_EXTERNAL_CATEGORY(mc_global);
  31
  32 using Simcall = simgrid::simix::Simcall;
  33
  34 namespace simgrid {
  35 namespace mc {
  36
  37 static inline const char* get_color(int id)
  38 {
  39   static constexpr std::array<const char*, 13> colors{{"blue", "red", "green3", "goldenrod", "brown", "purple",
  40                                                        "magenta", "turquoise4", "gray25", "forestgreen", "hotpink",
  41                                                        "lightblue", "tan"}};
  42   return colors[id % colors.size()];
  43 }
  44
  45 static std::string pointer_to_string(void* pointer)
  46 {
  47   return XBT_LOG_ISENABLED(Api, xbt_log_priority_verbose) ? xbt::string_printf("%p", pointer) : "(verbose only)";
  48 }
  49
  50 static std::string buff_size_to_string(size_t buff_size)
  51 {
  52   return XBT_LOG_ISENABLED(Api, xbt_log_priority_verbose) ? std::to_string(buff_size) : "(verbose only)";
  53 }
  54
  55 /* Search an enabled transition for the given process.
  56  *
  57  * This can be seen as an iterator returning the next transition of the process.
  58  *
  59  * We only consider the processes that are both
  60  *  - marked "to be interleaved" in their ActorState (controlled by the checker algorithm).
  61  *  - which simcall can currently be executed (like a comm where the other partner is already known)
  62  * Once we returned the last enabled transition of a process, it is marked done.
  63  *
  64  * Things can get muddled with the WAITANY and TESTANY simcalls, that are rewritten on the fly to a bunch of WAIT
  65  * (resp TEST) transitions using the transition.argument field to remember what was the last returned sub-transition.
  66  */
  67 static inline smx_simcall_t MC_state_choose_request_for_process(const RemoteProcess& process, simgrid::mc::State* state,
  68                                                                 smx_actor_t actor)
  69 {
  70   /* reset the outgoing transition */
  71   simgrid::mc::ActorState* procstate = &state->actor_states_[actor->get_pid()];
  72   state->transition_.aid_              = -1;
  73   state->transition_.times_considered_ = -1;
  74   state->transition_.textual[0]        = '\0';
  75   state->executed_req_.call_         = Simcall::NONE;
  76
  77   if (not simgrid::mc::actor_is_enabled(actor))
  78     return nullptr; // Not executable in the application
  79
  80   smx_simcall_t req = nullptr;
  81   if (actor->simcall_.observer_ != nullptr) {
  82     state->transition_.times_considered_ = procstate->get_times_considered_and_inc();
  83     if (actor->simcall_.mc_max_consider_ <= procstate->get_times_considered())
  84       procstate->set_done();
  85     req = &actor->simcall_;
  86   } else {
  87     procstate->set_done();
  88     state->transition_.times_considered_ = 0;
  89     req                                  = &actor->simcall_;
  90   }
  91   if (not req)
  92     return nullptr;
  93
  94   state->transition_.aid_ = actor->get_pid();
  95   state->executed_req_    = *req;
  96
  97   // Fetch the data of the request and translate it:
  98   state->internal_req_ = *req;
  99   state->internal_req_.mc_value_ = state->transition_.times_considered_;
 100
 101   return req;
 102 }
 103
 104 kernel::activity::CommImpl* Api::get_comm_or_nullptr(smx_simcall_t const r) const
 105 {
 106   if (auto wait = dynamic_cast<kernel::actor::ActivityWaitSimcall*>(r->observer_))
 107     return static_cast<kernel::activity::CommImpl*>(wait->get_activity());
 108   if (auto test = dynamic_cast<kernel::actor::ActivityTestSimcall*>(r->observer_))
 109     return static_cast<kernel::activity::CommImpl*>(test->get_activity());
 110   return nullptr;
 111 }
 112
 113 /** Statically "upcast" a s_smx_actor_t into an ActorInformation
 114  *
 115  *  This gets 'actorInfo' from '&actorInfo->copy'. It upcasts in the
 116  *  sense that we could achieve the same thing by having ActorInformation
 117  *  inherit from s_smx_actor_t but we don't really want to do that.
 118  */
 119 simgrid::mc::ActorInformation* Api::actor_info_cast(smx_actor_t actor) const
 120 {
 121   simgrid::mc::ActorInformation temp;
 122   std::size_t offset = (char*)temp.copy.get_buffer() - (char*)&temp;
 123
 124   auto* process_info = reinterpret_cast<simgrid::mc::ActorInformation*>((char*)actor - offset);
 125   return process_info;
 126 }
 127
 128 bool Api::requests_are_dependent(RemotePtr<kernel::actor::SimcallObserver> obs1,
 129                                  RemotePtr<kernel::actor::SimcallObserver> obs2) const
 130 {
 131   xbt_assert(mc_model_checker != nullptr, "Must be called from MCer");
 132
 133   return mc_model_checker->requests_are_dependent(obs1, obs2);
 134 }
 135
 136 xbt::string const& Api::get_actor_host_name(smx_actor_t actor) const
 137 {
 138   if (mc_model_checker == nullptr)
 139     return actor->get_host()->get_name();
 140
 141   const simgrid::mc::RemoteProcess* process = &mc_model_checker->get_remote_process();
 142
 143   // Read the simgrid::xbt::string in the MCed process:
 144   simgrid::mc::ActorInformation* info = actor_info_cast(actor);
 145
 146   if (not info->hostname) {
 147     Remote<s4u::Host> temp_host = process->read(remote(actor->get_host()));
 148     auto remote_string_address  = remote(&xbt::string::to_string_data(temp_host.get_buffer()->get_impl()->get_name()));
 149     simgrid::xbt::string_data remote_string = process->read(remote_string_address);
 150     std::vector<char> hostname(remote_string.len + 1);
 151     // no need to read the terminating null byte, and thus hostname[remote_string.len] is guaranteed to be '\0'
 152     process->read_bytes(hostname.data(), remote_string.len, remote(remote_string.data));
 153     info->hostname = &mc_model_checker->get_host_name(hostname.data());
 154   }
 155   return *info->hostname;
 156 }
 157
 158 xbt::string const& Api::get_actor_name(smx_actor_t actor) const
 159 {
 160   if (mc_model_checker == nullptr)
 161     return actor->get_name();
 162
 163   simgrid::mc::ActorInformation* info = actor_info_cast(actor);
 164   if (info->name.empty()) {
 165     const simgrid::mc::RemoteProcess* process = &mc_model_checker->get_remote_process();
 166
 167     simgrid::xbt::string_data string_data = simgrid::xbt::string::to_string_data(actor->name_);
 168     info->name = process->read_string(remote(string_data.data), string_data.len);
 169   }
 170   return info->name;
 171 }
 172
 173 std::string Api::get_actor_string(smx_actor_t actor) const
 174 {
 175   std::string res;
 176   if (actor) {
 177     res = "(" + std::to_string(actor->get_pid()) + ")";
 178     if (actor->get_host())
 179       res += std::string(get_actor_host_name(actor)) + " (" + std::string(get_actor_name(actor)) + ")";
 180     else
 181       res += get_actor_name(actor);
 182   } else
 183     res = "(0) ()";
 184   return res;
 185 }
 186
 187 std::string Api::get_actor_dot_label(smx_actor_t actor) const
 188 {
 189   std::string res = "(" + std::to_string(actor->get_pid()) + ")";
 190   if (actor->get_host())
 191     res += get_actor_host_name(actor);
 192   return res;
 193 }
 194
 195 simgrid::mc::Checker* Api::initialize(char** argv, simgrid::mc::CheckerAlgorithm algo) const
 196 {
 197   auto session = new simgrid::mc::Session([argv] {
 198     int i = 1;
 199     while (argv[i] != nullptr && argv[i][0] == '-')
 200       i++;
 201     xbt_assert(argv[i] != nullptr,
 202                "Unable to find a binary to exec on the command line. Did you only pass config flags?");
 203     execvp(argv[i], argv + i);
 204     xbt_die("The model-checked process failed to exec(%s): %s", argv[i], strerror(errno));
 205   });
 206
 207   simgrid::mc::Checker* checker;
 208   switch (algo) {
 209     case CheckerAlgorithm::CommDeterminism:
 210       checker = simgrid::mc::create_communication_determinism_checker(session);
 211       break;
 212
 213     case CheckerAlgorithm::UDPOR:
 214       checker = simgrid::mc::create_udpor_checker(session);
 215       break;
 216
 217     case CheckerAlgorithm::Safety:
 218       checker = simgrid::mc::create_safety_checker(session);
 219       break;
 220
 221     case CheckerAlgorithm::Liveness:
 222       checker = simgrid::mc::create_liveness_checker(session);
 223       break;
 224
 225     default:
 226       THROW_IMPOSSIBLE;
 227   }
 228
 229   // FIXME: session and checker are never deleted
 230   simgrid::mc::session_singleton = session;
 231   mc_model_checker->setChecker(checker);
 232   return checker;
 233 }
 234
 235 std::vector<simgrid::mc::ActorInformation>& Api::get_actors() const
 236 {
 237   return mc_model_checker->get_remote_process().actors();
 238 }
 239
 240 unsigned long Api::get_maxpid() const
 241 {
 242   return mc_model_checker->get_remote_process().get_maxpid();
 243 }
 244
 245 int Api::get_actors_size() const
 246 {
 247   return mc_model_checker->get_remote_process().actors().size();
 248 }
 249
 250 RemotePtr<kernel::activity::CommImpl> Api::get_comm_isend_raw_addr(smx_simcall_t request) const
 251 {
 252   return remote(static_cast<kernel::activity::CommImpl*>(simcall_comm_isend__getraw__result(request)));
 253 }
 254
 255 RemotePtr<kernel::activity::CommImpl> Api::get_comm_waitany_raw_addr(smx_simcall_t request, int value) const
 256 {
 257   auto addr      = simcall_comm_waitany__getraw__comms(request) + value;
 258   auto comm_addr = mc_model_checker->get_remote_process().read(remote(addr));
 259   return RemotePtr<kernel::activity::CommImpl>(static_cast<kernel::activity::CommImpl*>(comm_addr));
 260 }
 261
 262 std::string Api::get_pattern_comm_rdv(RemotePtr<kernel::activity::CommImpl> const& addr) const
 263 {
 264   Remote<kernel::activity::CommImpl> temp_activity;
 265   mc_model_checker->get_remote_process().read(temp_activity, addr);
 266   const kernel::activity::CommImpl* activity = temp_activity.get_buffer();
 267
 268   char* remote_name = mc_model_checker->get_remote_process().read<char*>(RemotePtr<char*>(
 269       (uint64_t)(activity->get_mailbox() ? &activity->get_mailbox()->get_name() : &activity->mbox_cpy->get_name())));
 270   auto rdv          = mc_model_checker->get_remote_process().read_string(RemotePtr<char>(remote_name));
 271   return rdv;
 272 }
 273
 274 unsigned long Api::get_pattern_comm_src_proc(RemotePtr<kernel::activity::CommImpl> const& addr) const
 275 {
 276   Remote<kernel::activity::CommImpl> temp_activity;
 277   mc_model_checker->get_remote_process().read(temp_activity, addr);
 278   const kernel::activity::CommImpl* activity = temp_activity.get_buffer();
 279   auto src_proc =
 280       mc_model_checker->get_remote_process().resolve_actor(mc::remote(activity->src_actor_.get()))->get_pid();
 281   return src_proc;
 282 }
 283
 284 unsigned long Api::get_pattern_comm_dst_proc(RemotePtr<kernel::activity::CommImpl> const& addr) const
 285 {
 286   Remote<kernel::activity::CommImpl> temp_activity;
 287   mc_model_checker->get_remote_process().read(temp_activity, addr);
 288   const kernel::activity::CommImpl* activity = temp_activity.get_buffer();
 289   auto src_proc =
 290       mc_model_checker->get_remote_process().resolve_actor(mc::remote(activity->dst_actor_.get()))->get_pid();
 291   return src_proc;
 292 }
 293
 294 std::vector<char> Api::get_pattern_comm_data(RemotePtr<kernel::activity::CommImpl> const& addr) const
 295 {
 296   simgrid::mc::Remote<simgrid::kernel::activity::CommImpl> temp_comm;
 297   mc_model_checker->get_remote_process().read(temp_comm, addr);
 298   const simgrid::kernel::activity::CommImpl* comm = temp_comm.get_buffer();
 299
 300   std::vector<char> buffer{};
 301   if (comm->src_buff_ != nullptr) {
 302     buffer.resize(comm->src_buff_size_);
 303     mc_model_checker->get_remote_process().read_bytes(buffer.data(), buffer.size(), remote(comm->src_buff_));
 304   }
 305   return buffer;
 306 }
 307
 308 #if HAVE_SMPI
 309 bool Api::check_send_request_detached(smx_simcall_t const& simcall) const
 310 {
 311   Remote<simgrid::smpi::Request> mpi_request;
 312   mc_model_checker->get_remote_process().read(
 313       mpi_request, remote(static_cast<smpi::Request*>(simcall_comm_isend__get__data(simcall))));
 314   return mpi_request.get_buffer()->detached();
 315 }
 316 #endif
 317
 318 smx_actor_t Api::get_src_actor(RemotePtr<kernel::activity::CommImpl> const& comm_addr) const
 319 {
 320   simgrid::mc::Remote<simgrid::kernel::activity::CommImpl> temp_comm;
 321   mc_model_checker->get_remote_process().read(temp_comm, comm_addr);
 322   const simgrid::kernel::activity::CommImpl* comm = temp_comm.get_buffer();
 323
 324   auto src_proc = mc_model_checker->get_remote_process().resolve_actor(simgrid::mc::remote(comm->src_actor_.get()));
 325   return src_proc;
 326 }
 327
 328 smx_actor_t Api::get_dst_actor(RemotePtr<kernel::activity::CommImpl> const& comm_addr) const
 329 {
 330   simgrid::mc::Remote<simgrid::kernel::activity::CommImpl> temp_comm;
 331   mc_model_checker->get_remote_process().read(temp_comm, comm_addr);
 332   const simgrid::kernel::activity::CommImpl* comm = temp_comm.get_buffer();
 333
 334   auto dst_proc = mc_model_checker->get_remote_process().resolve_actor(simgrid::mc::remote(comm->dst_actor_.get()));
 335   return dst_proc;
 336 }
 337
 338 std::size_t Api::get_remote_heap_bytes() const
 339 {
 340   RemoteProcess& process    = mc_model_checker->get_remote_process();
 341   auto heap_bytes_used      = mmalloc_get_bytes_used_remote(process.get_heap()->heaplimit, process.get_malloc_info());
 342   return heap_bytes_used;
 343 }
 344
 345 void Api::mc_inc_visited_states() const
 346 {
 347   mc_model_checker->visited_states++;
 348 }
 349
 350 void Api::mc_inc_executed_trans() const
 351 {
 352   mc_model_checker->executed_transitions++;
 353 }
 354
 355 unsigned long Api::mc_get_visited_states() const
 356 {
 357   return mc_model_checker->visited_states;
 358 }
 359
 360 unsigned long Api::mc_get_executed_trans() const
 361 {
 362   return mc_model_checker->executed_transitions;
 363 }
 364
 365 void Api::mc_check_deadlock() const
 366 {
 367   if (mc_model_checker->checkDeadlock()) {
 368     XBT_CINFO(mc_global, "**************************");
 369     XBT_CINFO(mc_global, "*** DEADLOCK DETECTED ***");
 370     XBT_CINFO(mc_global, "**************************");
 371     XBT_CINFO(mc_global, "Counter-example execution trace:");
 372     for (auto const& s : mc_model_checker->getChecker()->get_textual_trace())
 373       XBT_CINFO(mc_global, "  %s", s.c_str());
 374     simgrid::mc::dumpRecordPath();
 375     simgrid::mc::session_singleton->log_state();
 376     throw DeadlockError();
 377   }
 378 }
 379
 380 /** Get the issuer of a simcall (`req->issuer`)
 381  *
 382  *  In split-process mode, it does the black magic necessary to get an address
 383  *  of a (shallow) copy of the data structure the issuer SIMIX actor in the local
 384  *  address space.
 385  *
 386  *  @param process the MCed process
 387  *  @param req     the simcall (copied in the local process)
 388  */
 389 smx_actor_t Api::simcall_get_issuer(s_smx_simcall const* req) const
 390 {
 391   xbt_assert(mc_model_checker != nullptr);
 392
 393   // This is the address of the smx_actor in the MCed process:
 394   auto address = simgrid::mc::remote(req->issuer_);
 395
 396   // Lookup by address:
 397   for (auto& actor : mc_model_checker->get_remote_process().actors())
 398     if (actor.address == address)
 399       return actor.copy.get_buffer();
 400   for (auto& actor : mc_model_checker->get_remote_process().dead_actors())
 401     if (actor.address == address)
 402       return actor.copy.get_buffer();
 403
 404   xbt_die("Issuer not found");
 405 }
 406
 407 RemotePtr<kernel::activity::MailboxImpl> Api::get_mbox_remote_addr(smx_simcall_t const req) const
 408 {
 409   if (req->call_ == Simcall::COMM_ISEND)
 410     return remote(simcall_comm_isend__get__mbox(req));
 411   if (req->call_ == Simcall::COMM_IRECV)
 412     return remote(simcall_comm_irecv__get__mbox(req));
 413   THROW_IMPOSSIBLE;
 414 }
 415
 416 RemotePtr<kernel::activity::ActivityImpl> Api::get_comm_remote_addr(smx_simcall_t const req) const
 417 {
 418   if (req->call_ == Simcall::COMM_ISEND)
 419     return remote(simcall_comm_isend__getraw__result(req));
 420   if (req->call_ == Simcall::COMM_IRECV)
 421     return remote(simcall_comm_irecv__getraw__result(req));
 422   THROW_IMPOSSIBLE;
 423 }
 424
 425 void Api::handle_simcall(Transition const& transition) const
 426 {
 427   mc_model_checker->handle_simcall(transition);
 428 }
 429
 430 void Api::mc_wait_for_requests() const
 431 {
 432   mc_model_checker->wait_for_requests();
 433 }
 434
 435 void Api::mc_exit(int status) const
 436 {
 437   mc_model_checker->exit(status);
 438 }
 439
 440 void Api::dump_record_path() const
 441 {
 442   simgrid::mc::dumpRecordPath();
 443 }
 444
 445 smx_simcall_t Api::mc_state_choose_request(simgrid::mc::State* state) const
 446 {
 447   RemoteProcess& process = mc_model_checker->get_remote_process();
 448   XBT_DEBUG("Search for an actor to run. %zu actors to consider", process.actors().size());
 449   for (auto& actor : process.actors()) {
 450     /* Only consider the actors that were marked as interleaving by the checker algorithm */
 451     if (not state->actor_states_[actor.copy.get_buffer()->get_pid()].is_todo())
 452       continue;
 453
 454     smx_simcall_t res = MC_state_choose_request_for_process(process, state, actor.copy.get_buffer());
 455     if (res) {
 456       XBT_DEBUG("Let's run actor %ld, going for transition %s", actor.copy.get_buffer()->get_pid(),
 457                 SIMIX_simcall_name(*res));
 458       return res;
 459     }
 460   }
 461   return nullptr;
 462 }
 463
 464 std::list<transition_detail_t> Api::get_enabled_transitions(simgrid::mc::State* state) const
 465 {
 466   std::list<transition_detail_t> tr_list{};
 467
 468   for (auto& actor : mc_model_checker->get_remote_process().actors()) {
 469     auto actor_pid  = actor.copy.get_buffer()->get_pid();
 470     auto actor_impl = actor.copy.get_buffer();
 471
 472     // Only consider the actors that were marked as interleaving by the checker algorithm
 473     if (not state->actor_states_[actor_pid].is_todo())
 474       continue;
 475     // Not executable in the application
 476     if (not simgrid::mc::actor_is_enabled(actor_impl))
 477       continue;
 478
 479     auto transition       = std::make_unique<s_transition_detail>();
 480     Simcall simcall_call  = actor_impl->simcall_.call_;
 481     smx_simcall_t simcall = &actor_impl->simcall_;
 482     transition->call_     = simcall_call;
 483     switch (simcall_call) {
 484       case Simcall::COMM_ISEND:
 485       case Simcall::COMM_IRECV:
 486         transition->mbox_remote_addr = get_mbox_remote_addr(simcall);
 487         transition->comm_remote_addr = get_comm_remote_addr(simcall);
 488         break;
 489
 490       default:
 491         break;
 492     }
 493     tr_list.emplace_back(std::move(transition));
 494   }
 495
 496   return tr_list;
 497 }
 498
 499 std::string Api::request_to_string(smx_simcall_t req, int value) const
 500 {
 501   xbt_assert(mc_model_checker != nullptr, "Must be called from MCer");
 502
 503   smx_actor_t issuer = simcall_get_issuer(req);
 504
 505   if (issuer->simcall_.observer_ != nullptr)
 506     return mc_model_checker->simcall_to_string(issuer->get_pid(), value);
 507   else
 508     return "[" + get_actor_string(issuer) + "] " + SIMIX_simcall_name(*req) + "(unknown?)";
 509 }
 510
 511 std::string Api::request_get_dot_output(smx_simcall_t req, int value) const
 512 {
 513   if (req->observer_ != nullptr) {
 514     const smx_actor_t issuer = simcall_get_issuer(req);
 515     const char* color        = get_color(issuer->get_pid() - 1);
 516     return "label = \"" + mc_model_checker->simcall_dot_label(issuer->get_pid(), value) + "\", color = " + color +
 517            ", fontcolor = " + color;
 518   } else
 519     return "UNIMPLEMENTED";
 520 }
 521
 522 #if HAVE_SMPI
 523 int Api::get_smpi_request_tag(smx_simcall_t const& simcall, simgrid::simix::Simcall type) const
 524 {
 525   void* simcall_data = nullptr;
 526   if (type == Simcall::COMM_ISEND)
 527     simcall_data = simcall_comm_isend__get__data(simcall);
 528   else if (type == Simcall::COMM_IRECV)
 529     simcall_data = simcall_comm_irecv__get__data(simcall);
 530   Remote<simgrid::smpi::Request> mpi_request;
 531   mc_model_checker->get_remote_process().read(mpi_request, remote(static_cast<smpi::Request*>(simcall_data)));
 532   return mpi_request.get_buffer()->tag();
 533 }
 534 #endif
 535
 536 void Api::restore_state(std::shared_ptr<simgrid::mc::Snapshot> system_state) const
 537 {
 538   system_state->restore(&mc_model_checker->get_remote_process());
 539 }
 540
 541 void Api::log_state() const
 542 {
 543   session_singleton->log_state();
 544 }
 545
 546 bool Api::snapshot_equal(const Snapshot* s1, const Snapshot* s2) const
 547 {
 548   return simgrid::mc::snapshot_equal(s1, s2);
 549 }
 550
 551 simgrid::mc::Snapshot* Api::take_snapshot(int num_state) const
 552 {
 553   auto snapshot = new simgrid::mc::Snapshot(num_state);
 554   return snapshot;
 555 }
 556
 557 void Api::s_close() const
 558 {
 559   session_singleton->close();
 560 }
 561
 562 RemotePtr<simgrid::kernel::actor::SimcallObserver> Api::execute(Transition& transition, smx_simcall_t simcall) const
 563 {
 564   /* FIXME: once all simcalls have observers, kill the simcall parameter and use mc_model_checker->simcall_to_string() */
 565   transition.textual = request_to_string(simcall, transition.times_considered_);
 566   return session_singleton->execute(transition);
 567 }
 568
 569 void Api::automaton_load(const char* file) const
 570 {
 571   MC_automaton_load(file);
 572 }
 573
 574 std::vector<int> Api::automaton_propositional_symbol_evaluate() const
 575 {
 576   unsigned int cursor = 0;
 577   std::vector<int> values;
 578   xbt_automaton_propositional_symbol_t ps = nullptr;
 579   xbt_dynar_foreach (mc::property_automaton->propositional_symbols, cursor, ps)
 580     values.push_back(xbt_automaton_propositional_symbol_evaluate(ps));
 581   return values;
 582 }
 583
 584 std::vector<xbt_automaton_state_t> Api::get_automaton_state() const
 585 {
 586   std::vector<xbt_automaton_state_t> automaton_stack;
 587   unsigned int cursor = 0;
 588   xbt_automaton_state_t automaton_state;
 589   xbt_dynar_foreach (mc::property_automaton->states, cursor, automaton_state)
 590     if (automaton_state->type == -1)
 591       automaton_stack.push_back(automaton_state);
 592   return automaton_stack;
 593 }
 594
 595 int Api::compare_automaton_exp_label(const xbt_automaton_exp_label* l) const
 596 {
 597   unsigned int cursor                    = 0;
 598   xbt_automaton_propositional_symbol_t p = nullptr;
 599   xbt_dynar_foreach (simgrid::mc::property_automaton->propositional_symbols, cursor, p) {
 600     if (std::strcmp(xbt_automaton_propositional_symbol_get_name(p), l->u.predicat) == 0)
 601       return cursor;
 602   }
 603   return -1;
 604 }
 605
 606 void Api::set_property_automaton(xbt_automaton_state_t const& automaton_state) const
 607 {
 608   mc::property_automaton->current_state = automaton_state;
 609 }
 610
 611 xbt_automaton_exp_label_t Api::get_automaton_transition_label(xbt_dynar_t const& dynar, int index) const
 612 {
 613   const xbt_automaton_transition* transition = xbt_dynar_get_as(dynar, index, xbt_automaton_transition_t);
 614   return transition->label;
 615 }
 616
 617 xbt_automaton_state_t Api::get_automaton_transition_dst(xbt_dynar_t const& dynar, int index) const
 618 {
 619   const xbt_automaton_transition* transition = xbt_dynar_get_as(dynar, index, xbt_automaton_transition_t);
 620   return transition->dst;
 621 }
 622
 623 } // namespace mc
 624 } // namespace simgrid