src/mc/mc_smx.cpp

   1 /* Copyright (c) 2015-2019. 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 /** HACK, Statically "upcast" a s_smx_actor_t into a ActorInformation
  14  *
  15  *  This gets 'actorInfo' from '&actorInfo->copy'. It upcasts in the
  16  *  sense that we could achieve the same thing by having ActorInformation
  17  *  inherit from s_smx_actor_t but we don't really want to do that.
  18  */
  19 static inline simgrid::mc::ActorInformation* actor_info_cast(smx_actor_t actor)
  20 {
  21   simgrid::mc::ActorInformation temp;
  22   std::size_t offset = (char*) temp.copy.getBuffer() - (char*)&temp;
  23
  24   simgrid::mc::ActorInformation* process_info = (simgrid::mc::ActorInformation*)((char*)actor - offset);
  25   return process_info;
  26 }
  27
  28 /** Load the remote list of processes into a vector
  29  *
  30  *  @param process      MCed process
  31  *  @param target       Local vector (to be filled with copies of `s_smx_actor_t`)
  32  *  @param remote_dynar Address of the process dynar in the remote list
  33  */
  34 static void MC_process_refresh_simix_actor_dynar(simgrid::mc::RemoteClient* process,
  35                                                  std::vector<simgrid::mc::ActorInformation>& target,
  36                                                  simgrid::mc::RemotePtr<s_xbt_dynar_t> remote_dynar)
  37 {
  38   target.clear();
  39
  40   s_xbt_dynar_t dynar;
  41   process->read_bytes(&dynar, sizeof(dynar), remote_dynar);
  42
  43   smx_actor_t* data = static_cast<smx_actor_t*>(::operator new(dynar.elmsize * dynar.used));
  44   process->read_bytes(data, dynar.elmsize * dynar.used, simgrid::mc::RemotePtr<void>(dynar.data));
  45
  46   // Load each element of the vector from the MCed process:
  47   for (unsigned int i = 0; i < dynar.used; ++i) {
  48
  49     simgrid::mc::ActorInformation info;
  50     info.address  = simgrid::mc::RemotePtr<simgrid::kernel::actor::ActorImpl>(data[i]);
  51     info.hostname = nullptr;
  52     process->read_bytes(&info.copy, sizeof(info.copy), remote(data[i]));
  53     target.push_back(std::move(info));
  54   }
  55   ::operator delete(data);
  56 }
  57 namespace simgrid {
  58 namespace mc {
  59
  60 void RemoteClient::refresh_simix()
  61 {
  62   if (this->cache_flags_ & RemoteClient::cache_simix_processes)
  63     return;
  64
  65   // TODO, avoid to reload `&simix_global`, `simix_global`, `*simix_global`
  66
  67   static_assert(std::is_same<
  68       std::unique_ptr<simgrid::simix::Global>,
  69       decltype(simix_global)
  70     >::value, "Unexpected type for simix_global");
  71   static_assert(sizeof(simix_global) == sizeof(simgrid::simix::Global*),
  72     "Bad size for simix_global");
  73
  74   RemotePtr<simgrid::simix::Global> simix_global_p{this->read_variable<simgrid::simix::Global*>("simix_global")};
  75
  76   // simix_global = REMOTE(*simix_global)
  77   Remote<simgrid::simix::Global> simix_global =
  78     this->read<simgrid::simix::Global>(simix_global_p);
  79
  80   MC_process_refresh_simix_actor_dynar(this, this->smx_actors_infos, remote(simix_global.getBuffer()->actors_vector));
  81   MC_process_refresh_simix_actor_dynar(this, this->smx_dead_actors_infos,
  82                                        remote(simix_global.getBuffer()->dead_actors_vector));
  83
  84   this->cache_flags_ |= RemoteClient::cache_simix_processes;
  85 }
  86
  87 }
  88 }
  89
  90 /** Get the issuer of a simcall (`req->issuer`)
  91  *
  92  *  In split-process mode, it does the black magic necessary to get an address
  93  *  of a (shallow) copy of the data structure the issuer SIMIX actor in the local
  94  *  address space.
  95  *
  96  *  @param process the MCed process
  97  *  @param req     the simcall (copied in the local process)
  98  */
  99 smx_actor_t MC_smx_simcall_get_issuer(s_smx_simcall const* req)
 100 {
 101   xbt_assert(mc_model_checker != nullptr);
 102
 103   // This is the address of the smx_actor in the MCed process:
 104   auto address = simgrid::mc::remote(req->issuer);
 105
 106   // Lookup by address:
 107   for (auto& actor : mc_model_checker->process().actors())
 108     if (actor.address == address)
 109       return actor.copy.getBuffer();
 110   for (auto& actor : mc_model_checker->process().dead_actors())
 111     if (actor.address == address)
 112       return actor.copy.getBuffer();
 113
 114   xbt_die("Issuer not found");
 115 }
 116
 117 const char* MC_smx_actor_get_host_name(smx_actor_t actor)
 118 {
 119   if (mc_model_checker == nullptr)
 120     return actor->get_host()->get_cname();
 121
 122   simgrid::mc::RemoteClient* process = &mc_model_checker->process();
 123
 124   // Read the simgrid::xbt::string in the MCed process:
 125   simgrid::mc::ActorInformation* info     = actor_info_cast(actor);
 126   auto remote_string_address              = remote((simgrid::xbt::string_data*)&actor->get_host()->get_name());
 127   simgrid::xbt::string_data remote_string = process->read(remote_string_address);
 128   char hostname[remote_string.len];
 129   process->read_bytes(hostname, remote_string.len + 1, remote(remote_string.data));
 130   info->hostname = mc_model_checker->get_host_name(hostname).c_str();
 131   return info->hostname;
 132 }
 133
 134 const char* MC_smx_actor_get_name(smx_actor_t actor)
 135 {
 136   simgrid::mc::RemoteClient* process = &mc_model_checker->process();
 137   if (mc_model_checker == nullptr)
 138     return actor->get_cname();
 139
 140   simgrid::mc::ActorInformation* info = actor_info_cast(actor);
 141   if (info->name.empty()) {
 142     simgrid::xbt::string_data string_data = simgrid::xbt::string::to_string_data(actor->name_);
 143     info->name = process->read_string(remote(string_data.data), string_data.len);
 144   }
 145   return info->name.c_str();
 146 }
 147
 148 #if HAVE_SMPI
 149 int MC_smpi_process_count()
 150 {
 151   if (mc_model_checker == nullptr)
 152     return smpi_process_count();
 153   int res;
 154   mc_model_checker->process().read_variable("process_count", &res, sizeof(res));
 155   return res;
 156 }
 157 #endif
 158
 159 unsigned long MC_smx_get_maxpid()
 160 {
 161   unsigned long maxpid;
 162   mc_model_checker->process().read_variable("simix_process_maxpid",
 163     &maxpid, sizeof(maxpid));
 164   return maxpid;
 165 }