src/mc/mc_smx.cpp

   1 /* Copyright (c) 2015-2021. 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 "simgrid/s4u/Host.hpp"
   7
   8 #include "src/mc/ModelChecker.hpp"
   9 #include "src/mc/mc_smx.hpp"
  10
  11 using simgrid::mc::remote;
  12
  13 /** Load the remote list of processes into a vector
  14  *
  15  *  @param process      MCed process
  16  *  @param target       Local vector (to be filled with copies of `s_smx_actor_t`)
  17  *  @param remote_dynar Address of the process dynar in the remote list
  18  */
  19 static void MC_process_refresh_simix_actor_dynar(const simgrid::mc::RemoteSimulation* process,
  20                                                  std::vector<simgrid::mc::ActorInformation>& target,
  21                                                  simgrid::mc::RemotePtr<s_xbt_dynar_t> remote_dynar)
  22 {
  23   target.clear();
  24
  25   s_xbt_dynar_t dynar;
  26   process->read_bytes(&dynar, sizeof(dynar), remote_dynar);
  27
  28   auto* data = static_cast<smx_actor_t*>(::operator new(dynar.elmsize * dynar.used));
  29   process->read_bytes(data, dynar.elmsize * dynar.used, simgrid::mc::RemotePtr<void>(dynar.data));
  30
  31   // Load each element of the vector from the MCed process:
  32   for (unsigned int i = 0; i < dynar.used; ++i) {
  33     simgrid::mc::ActorInformation info;
  34
  35     info.address  = simgrid::mc::RemotePtr<simgrid::kernel::actor::ActorImpl>(data[i]);
  36     info.hostname = nullptr;
  37     process->read_bytes(&info.copy, sizeof(info.copy), remote(data[i]));
  38     target.push_back(std::move(info));
  39   }
  40   ::operator delete(data);
  41 }
  42 namespace simgrid {
  43 namespace mc {
  44
  45 void RemoteSimulation::refresh_simix()
  46 {
  47   if (this->cache_flags_ & RemoteSimulation::cache_simix_processes)
  48     return;
  49
  50   // TODO, avoid to reload `&simix_global`, `simix_global`, `*simix_global`
  51
  52   static_assert(std::is_same<
  53       std::unique_ptr<simgrid::simix::Global>,
  54       decltype(simix_global)
  55     >::value, "Unexpected type for simix_global");
  56   static_assert(sizeof(simix_global) == sizeof(simgrid::simix::Global*),
  57     "Bad size for simix_global");
  58
  59   RemotePtr<simgrid::simix::Global> simix_global_p{this->read_variable<simgrid::simix::Global*>("simix_global")};
  60
  61   // simix_global = REMOTE(*simix_global)
  62   Remote<simgrid::simix::Global> simix_global =
  63     this->read<simgrid::simix::Global>(simix_global_p);
  64
  65   MC_process_refresh_simix_actor_dynar(this, this->smx_actors_infos, remote(simix_global.get_buffer()->actors_vector));
  66   MC_process_refresh_simix_actor_dynar(this, this->smx_dead_actors_infos,
  67                                        remote(simix_global.get_buffer()->dead_actors_vector));
  68
  69   this->cache_flags_ |= RemoteSimulation::cache_simix_processes;
  70 }
  71
  72 }
  73 }
  74
  75 unsigned long MC_smx_get_maxpid()
  76 {
  77   unsigned long maxpid;
  78   const char* name = "simgrid::kernel::actor::maxpid";
  79   if (mc_model_checker->get_remote_simulation().find_variable(name) == nullptr)
  80     name = "maxpid"; // We seem to miss the namespaces when compiling with GCC
  81   mc_model_checker->get_remote_simulation().read_variable(name, &maxpid, sizeof(maxpid));
  82   return maxpid;
  83 }