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