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                 simcall_comm_testany__get__count(&process->simcall))
 110           if (simgrid::mc::request_is_enabled_by_idx(&process->simcall,
 111               procstate->interleave_count++)) {
 112             state->transition.argument = procstate->interleave_count - 1;
 113             break;
 114           }
 115
 116         if (procstate->interleave_count >=
 117             simcall_comm_testany__get__count(&process->simcall))
 118           procstate->setDone();
 119
 120         if (state->transition.argument != -1 || start_count == 0)
 121            req = &process->simcall;
 122
 123         break;
 124       }
 125
 126       case SIMCALL_COMM_WAIT: {
 127         simgrid::mc::RemotePtr<simgrid::simix::Comm> remote_act = remote(
 128           static_cast<simgrid::simix::Comm*>(simcall_comm_wait__get__comm(&process->simcall)));
 129         simgrid::mc::Remote<simgrid::simix::Comm> temp_act;
 130         mc_model_checker->process().read(temp_act, remote_act);
 131         simgrid::simix::Comm* act = temp_act.getBuffer();
 132         if (act->src_proc && act->dst_proc)
 133           state->transition.argument = 0;
 134         else if (act->src_proc == nullptr && act->type == SIMIX_COMM_READY
 135               && act->detached == 1)
 136           state->transition.argument = 0;
 137         else
 138           state->transition.argument = -1;
 139         procstate->setDone();
 140         req = &process->simcall;
 141         break;
 142       }
 143
 144       case SIMCALL_MC_RANDOM: {
 145         int min_value = simcall_mc_random__get__min(&process->simcall);
 146         state->transition.argument = procstate->interleave_count + min_value;
 147         procstate->interleave_count++;
 148         if (state->transition.argument == simcall_mc_random__get__max(&process->simcall))
 149           procstate->setDone();
 150         req = &process->simcall;
 151         break;
 152       }
 153
 154       default:
 155         procstate->setDone();
 156         state->transition.argument = 0;
 157         req = &process->simcall;
 158         break;
 159   }
 160   if (!req)
 161     return nullptr;
 162
 163   // Fetch the data of the request and translate it:
 164
 165   state->transition.pid = process->pid;
 166
 167   state->executed_req = *req;
 168
 169   /* The waitany and testany request are transformed into a wait or test request
 170    * over the corresponding communication action so it can be treated later by
 171    * the dependence function. */
 172   switch (req->call) {
 173   case SIMCALL_COMM_WAITANY: {
 174     state->internal_req.call = SIMCALL_COMM_WAIT;
 175     state->internal_req.issuer = req->issuer;
 176     smx_synchro_t remote_comm;
 177     read_element(mc_model_checker->process(),
 178       &remote_comm, remote(simcall_comm_waitany__get__comms(req)),
 179       state->transition.argument, sizeof(remote_comm));
 180     mc_model_checker->process().read(state->internal_comm, remote(
 181       static_cast<simgrid::simix::Comm*>(remote_comm)));
 182     simcall_comm_wait__set__comm(&state->internal_req, state->internal_comm.getBuffer());
 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 = mc_model_checker->process().read(
 193         remote(simcall_comm_testany__get__comms(req) + state->transition.argument));
 194       mc_model_checker->process().read(state->internal_comm, remote(
 195         static_cast<simgrid::simix::Comm*>(remote_comm)));
 196     }
 197
 198     simcall_comm_test__set__comm(&state->internal_req, state->internal_comm.getBuffer());
 199     simcall_comm_test__set__result(&state->internal_req, state->transition.argument);
 200     break;
 201
 202   case SIMCALL_COMM_WAIT:
 203     state->internal_req = *req;
 204     mc_model_checker->process().read_bytes(&state->internal_comm ,
 205       sizeof(state->internal_comm), remote(simcall_comm_wait__get__comm(req)));
 206     simcall_comm_wait__set__comm(&state->executed_req, state->internal_comm.getBuffer());
 207     simcall_comm_wait__set__comm(&state->internal_req, state->internal_comm.getBuffer());
 208     break;
 209
 210   case SIMCALL_COMM_TEST:
 211     state->internal_req = *req;
 212     mc_model_checker->process().read_bytes(&state->internal_comm,
 213       sizeof(state->internal_comm), remote(simcall_comm_test__get__comm(req)));
 214     simcall_comm_test__set__comm(&state->executed_req, state->internal_comm.getBuffer());
 215     simcall_comm_test__set__comm(&state->internal_req, state->internal_comm.getBuffer());
 216     break;
 217
 218   default:
 219     state->internal_req = *req;
 220     break;
 221   }
 222
 223   return req;
 224 }
 225
 226 smx_simcall_t MC_state_get_request(simgrid::mc::State* state)
 227 {
 228   for (auto& p : mc_model_checker->process().simix_processes()) {
 229     smx_simcall_t res = MC_state_get_request_for_process(state, p.copy.getBuffer());
 230     if (res)
 231       return res;
 232   }
 233   return nullptr;
 234 }