src/mc/mc_state.cpp

   1 /* Copyright (c) 2008-2017. 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 <assert.h>
   7
   8 #include <boost/range/algorithm.hpp>
   9
  10 #include <xbt/log.h>
  11 #include <xbt/sysdep.h>
  12
  13 #include "src/simix/smx_private.h"
  14 #include "src/mc/mc_state.h"
  15 #include "src/mc/mc_request.h"
  16 #include "src/mc/mc_private.h"
  17 #include "src/mc/mc_comm_pattern.h"
  18 #include "src/mc/mc_smx.h"
  19 #include "src/mc/mc_xbt.hpp"
  20 #include "src/mc/Transition.hpp"
  21
  22 using simgrid::mc::remote;
  23
  24 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_state, mc, "Logging specific to MC (state)");
  25
  26 namespace simgrid {
  27 namespace mc {
  28
  29 State::State(unsigned long state_number)
  30 {
  31   this->internal_comm.clear();
  32   std::memset(&this->internal_req, 0, sizeof(this->internal_req));
  33   std::memset(&this->executed_req, 0, sizeof(this->executed_req));
  34
  35   processStates.resize(MC_smx_get_maxpid());
  36   num = state_number;
  37   /* Stateful model checking */
  38   if ((_sg_mc_checkpoint > 0 && (state_number % _sg_mc_checkpoint == 0)) || _sg_mc_termination) {
  39     system_state = simgrid::mc::take_snapshot(num);
  40     if (_sg_mc_comms_determinism || _sg_mc_send_determinism) {
  41       MC_state_copy_incomplete_communications_pattern(this);
  42       MC_state_copy_index_communications_pattern(this);
  43     }
  44   }
  45 }
  46
  47 std::size_t State::interleaveSize() const
  48 {
  49   return boost::range::count_if(this->processStates,
  50     [](simgrid::mc::ProcessState const& p) { return p.isToInterleave(); });
  51 }
  52
  53 Transition State::getTransition() const
  54 {
  55   return this->transition;
  56 }
  57
  58 }
  59 }
  60
  61 static inline smx_simcall_t MC_state_get_request_for_process(
  62   simgrid::mc::State* state, smx_actor_t process)
  63 {
  64   simgrid::mc::ProcessState* procstate = &state->processStates[process->pid];
  65   state->transition.pid = -1;
  66   state->transition.argument = -1;
  67
  68   if (!procstate->isToInterleave())
  69     return nullptr;
  70   if (!simgrid::mc::actor_is_enabled(process))
  71     return nullptr;
  72
  73   smx_simcall_t req = nullptr;
  74   switch (process->simcall.call) {
  75       case SIMCALL_COMM_WAITANY:
  76         state->transition.argument = -1;
  77         while (procstate->interleave_count <
  78               read_length(mc_model_checker->process(),
  79                 remote(simcall_comm_waitany__get__comms(&process->simcall)))) {
  80           if (simgrid::mc::request_is_enabled_by_idx(&process->simcall,
  81               procstate->interleave_count++)) {
  82             state->transition.argument = procstate->interleave_count - 1;
  83             break;
  84           }
  85         }
  86
  87         if (procstate->interleave_count >=
  88             simgrid::mc::read_length(mc_model_checker->process(),
  89               simgrid::mc::remote(simcall_comm_waitany__get__comms(&process->simcall))))
  90           procstate->setDone();
  91         if (state->transition.argument != -1)
  92           req = &process->simcall;
  93         break;
  94
  95       case SIMCALL_COMM_TESTANY: {
  96         unsigned start_count = procstate->interleave_count;
  97         state->transition.argument = -1;
  98         while (procstate->interleave_count <
  99                 simcall_comm_testany__get__count(&process->simcall))
 100           if (simgrid::mc::request_is_enabled_by_idx(&process->simcall,
 101               procstate->interleave_count++)) {
 102             state->transition.argument = procstate->interleave_count - 1;
 103             break;
 104           }
 105
 106         if (procstate->interleave_count >=
 107             simcall_comm_testany__get__count(&process->simcall))
 108           procstate->setDone();
 109
 110         if (state->transition.argument != -1 || start_count == 0)
 111            req = &process->simcall;
 112
 113         break;
 114       }
 115
 116       case SIMCALL_COMM_WAIT: {
 117         simgrid::mc::RemotePtr<simgrid::kernel::activity::Comm> remote_act = remote(
 118           static_cast<simgrid::kernel::activity::Comm*>(simcall_comm_wait__get__comm(&process->simcall)));
 119         simgrid::mc::Remote<simgrid::kernel::activity::Comm> temp_act;
 120         mc_model_checker->process().read(temp_act, remote_act);
 121         simgrid::kernel::activity::Comm* act = temp_act.getBuffer();
 122         if (act->src_proc && act->dst_proc)
 123           state->transition.argument = 0;
 124         else if (act->src_proc == nullptr && act->type == SIMIX_COMM_READY
 125               && act->detached == 1)
 126           state->transition.argument = 0;
 127         else
 128           state->transition.argument = -1;
 129         procstate->setDone();
 130         req = &process->simcall;
 131         break;
 132       }
 133
 134       case SIMCALL_MC_RANDOM: {
 135         int min_value = simcall_mc_random__get__min(&process->simcall);
 136         state->transition.argument = procstate->interleave_count + min_value;
 137         procstate->interleave_count++;
 138         if (state->transition.argument == simcall_mc_random__get__max(&process->simcall))
 139           procstate->setDone();
 140         req = &process->simcall;
 141         break;
 142       }
 143
 144       default:
 145         procstate->setDone();
 146         state->transition.argument = 0;
 147         req = &process->simcall;
 148         break;
 149   }
 150   if (!req)
 151     return nullptr;
 152
 153   // Fetch the data of the request and translate it:
 154
 155   state->transition.pid = process->pid;
 156
 157   state->executed_req = *req;
 158
 159   /* The waitany and testany request are transformed into a wait or test request
 160    * over the corresponding communication action so it can be treated later by
 161    * the dependence function. */
 162   switch (req->call) {
 163   case SIMCALL_COMM_WAITANY: {
 164     state->internal_req.call = SIMCALL_COMM_WAIT;
 165     state->internal_req.issuer = req->issuer;
 166     smx_activity_t remote_comm;
 167     read_element(mc_model_checker->process(),
 168       &remote_comm, remote(simcall_comm_waitany__get__comms(req)),
 169       state->transition.argument, sizeof(remote_comm));
 170     mc_model_checker->process().read(state->internal_comm, remote(
 171       static_cast<simgrid::kernel::activity::Comm*>(remote_comm)));
 172     simcall_comm_wait__set__comm(&state->internal_req, state->internal_comm.getBuffer());
 173     simcall_comm_wait__set__timeout(&state->internal_req, 0);
 174     break;
 175   }
 176
 177   case SIMCALL_COMM_TESTANY:
 178     state->internal_req.call = SIMCALL_COMM_TEST;
 179     state->internal_req.issuer = req->issuer;
 180
 181     if (state->transition.argument > 0) {
 182       smx_activity_t remote_comm = mc_model_checker->process().read(
 183         remote(simcall_comm_testany__get__comms(req) + state->transition.argument));
 184       mc_model_checker->process().read(state->internal_comm, remote(
 185         static_cast<simgrid::kernel::activity::Comm*>(remote_comm)));
 186     }
 187
 188     simcall_comm_test__set__comm(&state->internal_req, state->internal_comm.getBuffer());
 189     simcall_comm_test__set__result(&state->internal_req, state->transition.argument);
 190     break;
 191
 192   case SIMCALL_COMM_WAIT:
 193     state->internal_req = *req;
 194     mc_model_checker->process().read_bytes(&state->internal_comm ,
 195       sizeof(state->internal_comm), remote(simcall_comm_wait__get__comm(req)));
 196     simcall_comm_wait__set__comm(&state->executed_req, state->internal_comm.getBuffer());
 197     simcall_comm_wait__set__comm(&state->internal_req, state->internal_comm.getBuffer());
 198     break;
 199
 200   case SIMCALL_COMM_TEST:
 201     state->internal_req = *req;
 202     mc_model_checker->process().read_bytes(&state->internal_comm,
 203       sizeof(state->internal_comm), remote(simcall_comm_test__get__comm(req)));
 204     simcall_comm_test__set__comm(&state->executed_req, state->internal_comm.getBuffer());
 205     simcall_comm_test__set__comm(&state->internal_req, state->internal_comm.getBuffer());
 206     break;
 207
 208   default:
 209     state->internal_req = *req;
 210     break;
 211   }
 212
 213   return req;
 214 }
 215
 216 smx_simcall_t MC_state_get_request(simgrid::mc::State* state)
 217 {
 218   for (auto& p : mc_model_checker->process().actors()) {
 219     smx_simcall_t res = MC_state_get_request_for_process(state, p.copy.getBuffer());
 220     if (res)
 221       return res;
 222   }
 223   return nullptr;
 224 }