src/mc/mc_state.cpp

   1 /* Copyright (c) 2008-2015. The SimGrid Team.
   2  * All rights reserved.                                                     */
   3
   4 /* This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the license (GNU LGPL) which comes with this package. */
   6
   7 #include <assert.h>
   8
   9 #include <boost/range/algorithm.hpp>
  10
  11 #include <xbt/log.h>
  12 #include <xbt/sysdep.h>
  13
  14 #include "src/simix/smx_private.h"
  15 #include "src/mc/mc_state.h"
  16 #include "src/mc/mc_request.h"
  17 #include "src/mc/mc_private.h"
  18 #include "src/mc/mc_comm_pattern.h"
  19 #include "src/mc/mc_smx.h"
  20 #include "src/mc/mc_xbt.hpp"
  21 #include "src/mc/Transition.hpp"
  22
  23 using simgrid::mc::remote;
  24
  25 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_state, mc,
  26                                 "Logging specific to MC (state)");
  27
  28 /**
  29  * \brief Creates a state data structure used by the exploration algorithm
  30  */
  31 simgrid::mc::State* MC_state_new(unsigned long state_number)
  32 {
  33   simgrid::mc::State* state = new simgrid::mc::State();
  34   state->processStates.resize(MC_smx_get_maxpid());
  35   state->num = state_number;
  36   /* Stateful model checking */
  37   if((_sg_mc_checkpoint > 0 && (state_number % _sg_mc_checkpoint == 0)) ||  _sg_mc_termination){
  38     state->system_state = simgrid::mc::take_snapshot(state->num);
  39     if(_sg_mc_comms_determinism || _sg_mc_send_determinism){
  40       MC_state_copy_incomplete_communications_pattern(state);
  41       MC_state_copy_index_communications_pattern(state);
  42     }
  43   }
  44   return state;
  45 }
  46
  47 namespace simgrid {
  48 namespace mc {
  49
  50 State::State()
  51 {
  52   this->internal_comm.clear();
  53   std::memset(&this->internal_req, 0, sizeof(this->internal_req));
  54   std::memset(&this->executed_req, 0, sizeof(this->executed_req));
  55 }
  56
  57 std::size_t State::interleaveSize() const
  58 {
  59   return boost::range::count_if(this->processStates,
  60     [](simgrid::mc::ProcessState const& p) { return p.isToInterleave(); });
  61 }
  62
  63 Transition State::getTransition() const
  64 {
  65   return this->transition;
  66 }
  67
  68 }
  69 }
  70
  71 static inline smx_simcall_t MC_state_get_request_for_process(
  72   simgrid::mc::State* state, smx_process_t process)
  73 {
  74   simgrid::mc::ProcessState* procstate = &state->processStates[process->pid];
  75   state->transition.pid = -1;
  76   state->transition.argument = -1;
  77
  78   if (!procstate->isToInterleave())
  79     return nullptr;
  80   if (!simgrid::mc::process_is_enabled(process))
  81     return nullptr;
  82
  83   smx_simcall_t req = nullptr;
  84   switch (process->simcall.call) {
  85       case SIMCALL_COMM_WAITANY:
  86         state->transition.argument = -1;
  87         while (procstate->interleave_count <
  88               read_length(mc_model_checker->process(),
  89                 remote(simcall_comm_waitany__get__comms(&process->simcall)))) {
  90           if (simgrid::mc::request_is_enabled_by_idx(&process->simcall,
  91               procstate->interleave_count++)) {
  92             state->transition.argument = procstate->interleave_count - 1;
  93             break;
  94           }
  95         }
  96
  97         if (procstate->interleave_count >=
  98             simgrid::mc::read_length(mc_model_checker->process(),
  99               simgrid::mc::remote(simcall_comm_waitany__get__comms(&process->simcall))))
 100           procstate->setDone();
 101         if (state->transition.argument != -1)
 102           req = &process->simcall;
 103         break;
 104
 105       case SIMCALL_COMM_TESTANY: {
 106         unsigned start_count = procstate->interleave_count;
 107         state->transition.argument = -1;
 108         while (procstate->interleave_count <
 109                 read_length(mc_model_checker->process(),
 110                   remote(simcall_comm_testany__get__comms(&process->simcall))))
 111           if (simgrid::mc::request_is_enabled_by_idx(&process->simcall,
 112               procstate->interleave_count++)) {
 113             state->transition.argument = procstate->interleave_count - 1;
 114             break;
 115           }
 116
 117         if (procstate->interleave_count >=
 118             read_length(mc_model_checker->process(),
 119               remote(simcall_comm_testany__get__comms(&process->simcall))))
 120           procstate->setDone();
 121
 122         if (state->transition.argument != -1 || start_count == 0)
 123            req = &process->simcall;
 124
 125         break;
 126       }
 127
 128       case SIMCALL_COMM_WAIT: {
 129         simgrid::mc::RemotePtr<simgrid::simix::Comm> remote_act = remote(
 130           static_cast<simgrid::simix::Comm*>(simcall_comm_wait__get__comm(&process->simcall)));
 131         simgrid::mc::Remote<simgrid::simix::Comm> temp_act;
 132         mc_model_checker->process().read(temp_act, remote_act);
 133         simgrid::simix::Comm* act = temp_act.getBuffer();
 134         if (act->src_proc && act->dst_proc)
 135           state->transition.argument = 0;
 136         else if (act->src_proc == nullptr && act->type == SIMIX_COMM_READY
 137               && act->detached == 1)
 138           state->transition.argument = 0;
 139         else
 140           state->transition.argument = -1;
 141         procstate->setDone();
 142         req = &process->simcall;
 143         break;
 144       }
 145
 146       case SIMCALL_MC_RANDOM: {
 147         int min_value = simcall_mc_random__get__min(&process->simcall);
 148         state->transition.argument = procstate->interleave_count + min_value;
 149         procstate->interleave_count++;
 150         if (state->transition.argument == simcall_mc_random__get__max(&process->simcall))
 151           procstate->setDone();
 152         req = &process->simcall;
 153         break;
 154       }
 155
 156       default:
 157         procstate->setDone();
 158         state->transition.argument = 0;
 159         req = &process->simcall;
 160         break;
 161   }
 162   if (!req)
 163     return nullptr;
 164
 165   // Fetch the data of the request and translate it:
 166
 167   state->transition.pid = process->pid;
 168
 169   state->executed_req = *req;
 170
 171   /* The waitany and testany request are transformed into a wait or test request
 172    * over the corresponding communication action so it can be treated later by
 173    * the dependence function. */
 174   switch (req->call) {
 175   case SIMCALL_COMM_WAITANY: {
 176     state->internal_req.call = SIMCALL_COMM_WAIT;
 177     state->internal_req.issuer = req->issuer;
 178     smx_synchro_t remote_comm;
 179     read_element(mc_model_checker->process(),
 180       &remote_comm, remote(simcall_comm_waitany__get__comms(req)),
 181       state->transition.argument, sizeof(remote_comm));
 182     mc_model_checker->process().read(state->internal_comm, remote(
 183       static_cast<simgrid::simix::Comm*>(remote_comm)));
 184     simcall_comm_wait__set__comm(&state->internal_req, state->internal_comm.getBuffer());
 185     simcall_comm_wait__set__timeout(&state->internal_req, 0);
 186     break;
 187   }
 188
 189   case SIMCALL_COMM_TESTANY:
 190     state->internal_req.call = SIMCALL_COMM_TEST;
 191     state->internal_req.issuer = req->issuer;
 192
 193     if (state->transition.argument > 0) {
 194       smx_synchro_t remote_comm;
 195       read_element(mc_model_checker->process(),
 196         &remote_comm, remote(simcall_comm_testany__get__comms(req)),
 197         state->transition.argument, sizeof(remote_comm));
 198       mc_model_checker->process().read(state->internal_comm, remote(
 199         static_cast<simgrid::simix::Comm*>(remote_comm)));
 200     }
 201
 202     simcall_comm_test__set__comm(&state->internal_req, state->internal_comm.getBuffer());
 203     simcall_comm_test__set__result(&state->internal_req, state->transition.argument);
 204     break;
 205
 206   case SIMCALL_COMM_WAIT:
 207     state->internal_req = *req;
 208     mc_model_checker->process().read_bytes(&state->internal_comm ,
 209       sizeof(state->internal_comm), remote(simcall_comm_wait__get__comm(req)));
 210     simcall_comm_wait__set__comm(&state->executed_req, state->internal_comm.getBuffer());
 211     simcall_comm_wait__set__comm(&state->internal_req, state->internal_comm.getBuffer());
 212     break;
 213
 214   case SIMCALL_COMM_TEST:
 215     state->internal_req = *req;
 216     mc_model_checker->process().read_bytes(&state->internal_comm,
 217       sizeof(state->internal_comm), remote(simcall_comm_test__get__comm(req)));
 218     simcall_comm_test__set__comm(&state->executed_req, state->internal_comm.getBuffer());
 219     simcall_comm_test__set__comm(&state->internal_req, state->internal_comm.getBuffer());
 220     break;
 221
 222   default:
 223     state->internal_req = *req;
 224     break;
 225   }
 226
 227   return req;
 228 }
 229
 230 smx_simcall_t MC_state_get_request(simgrid::mc::State* state)
 231 {
 232   for (auto& p : mc_model_checker->process().simix_processes()) {
 233     smx_simcall_t res = MC_state_get_request_for_process(state, p.copy.getBuffer());
 234     if (res)
 235       return res;
 236   }
 237   return nullptr;
 238 }