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 <algorithm>
  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   std::memset(&this->internal_comm, 0, sizeof(this->internal_comm));
  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 std::count_if(this->processStates.begin(), this->processStates.end(),
  60     [](simgrid::mc::ProcessState const& state) { return state.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         smx_synchro_t remote_act = simcall_comm_wait__get__comm(&process->simcall);
 130         s_smx_synchro_t act;
 131         mc_model_checker->process().read_bytes(
 132           &act, sizeof(act), remote(remote_act));
 133         if (act.comm.src_proc && act.comm.dst_proc)
 134           state->transition.argument = 0;
 135         else if (act.comm.src_proc == nullptr && act.comm.type == SIMIX_COMM_READY
 136               && act.comm.detached == 1)
 137           state->transition.argument = 0;
 138         else
 139           state->transition.argument = -1;
 140         procstate->setDone();
 141         req = &process->simcall;
 142         break;
 143       }
 144
 145       case SIMCALL_MC_RANDOM: {
 146         int min_value = simcall_mc_random__get__min(&process->simcall);
 147         state->transition.argument = procstate->interleave_count + min_value;
 148         procstate->interleave_count++;
 149         if (state->transition.argument == simcall_mc_random__get__max(&process->simcall))
 150           procstate->setDone();
 151         req = &process->simcall;
 152         break;
 153       }
 154
 155       default:
 156         procstate->setDone();
 157         state->transition.argument = 0;
 158         req = &process->simcall;
 159         break;
 160   }
 161   if (!req)
 162     return nullptr;
 163
 164   // Fetch the data of the request and translate it:
 165
 166   state->transition.pid = process->pid;
 167
 168   state->executed_req = *req;
 169
 170   /* The waitany and testany request are transformed into a wait or test request
 171    * over the corresponding communication action so it can be treated later by
 172    * the dependence function. */
 173   switch (req->call) {
 174   case SIMCALL_COMM_WAITANY: {
 175     state->internal_req.call = SIMCALL_COMM_WAIT;
 176     state->internal_req.issuer = req->issuer;
 177     smx_synchro_t remote_comm;
 178     read_element(mc_model_checker->process(),
 179       &remote_comm, remote(simcall_comm_waitany__get__comms(req)),
 180       state->transition.argument, sizeof(remote_comm));
 181     mc_model_checker->process().read(&state->internal_comm, remote(remote_comm));
 182     simcall_comm_wait__set__comm(&state->internal_req, &state->internal_comm);
 183     simcall_comm_wait__set__timeout(&state->internal_req, 0);
 184     break;
 185   }
 186
 187   case SIMCALL_COMM_TESTANY:
 188     state->internal_req.call = SIMCALL_COMM_TEST;
 189     state->internal_req.issuer = req->issuer;
 190
 191     if (state->transition.argument > 0) {
 192       smx_synchro_t remote_comm;
 193       read_element(mc_model_checker->process(),
 194         &remote_comm, remote(simcall_comm_testany__get__comms(req)),
 195         state->transition.argument, sizeof(remote_comm));
 196       mc_model_checker->process().read(&state->internal_comm, remote(remote_comm));
 197     }
 198
 199     simcall_comm_test__set__comm(&state->internal_req, &state->internal_comm);
 200     simcall_comm_test__set__result(&state->internal_req, state->transition.argument);
 201     break;
 202
 203   case SIMCALL_COMM_WAIT:
 204     state->internal_req = *req;
 205     mc_model_checker->process().read_bytes(&state->internal_comm ,
 206       sizeof(state->internal_comm), remote(simcall_comm_wait__get__comm(req)));
 207     simcall_comm_wait__set__comm(&state->executed_req, &state->internal_comm);
 208     simcall_comm_wait__set__comm(&state->internal_req, &state->internal_comm);
 209     break;
 210
 211   case SIMCALL_COMM_TEST:
 212     state->internal_req = *req;
 213     mc_model_checker->process().read_bytes(&state->internal_comm,
 214       sizeof(state->internal_comm), remote(simcall_comm_test__get__comm(req)));
 215     simcall_comm_test__set__comm(&state->executed_req, &state->internal_comm);
 216     simcall_comm_test__set__comm(&state->internal_req, &state->internal_comm);
 217     break;
 218
 219   default:
 220     state->internal_req = *req;
 221     break;
 222   }
 223
 224   return req;
 225 }
 226
 227 smx_simcall_t MC_state_get_request(simgrid::mc::State* state)
 228 {
 229   for (auto& p : mc_model_checker->process().simix_processes()) {
 230     smx_simcall_t res = MC_state_get_request_for_process(state, &p.copy);
 231     if (res)
 232       return res;
 233   }
 234   return nullptr;
 235 }