src/mc/mc_state.cpp

   1 /* Copyright (c) 2008-2014. 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 "../simix/smx_private.h"
  10 #include "xbt/fifo.h"
  11 #include "mc_state.h"
  12 #include "mc_request.h"
  13 #include "mc_private.h"
  14 #include "mc_comm_pattern.h"
  15 #include "mc_smx.h"
  16 #include "mc_xbt.hpp"
  17
  18 using simgrid::mc::remote;
  19
  20 extern "C" {
  21
  22 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_state, mc,
  23                                 "Logging specific to MC (state)");
  24
  25 /**
  26  * \brief Creates a state data structure used by the exploration algorithm
  27  */
  28 mc_state_t MC_state_new()
  29 {
  30   mc_state_t state = xbt_new0(s_mc_state_t, 1);
  31
  32   state->max_pid = MC_smx_get_maxpid();
  33   state->proc_status = xbt_new0(s_mc_procstate_t, state->max_pid);
  34   state->system_state = NULL;
  35   state->num = ++mc_stats->expanded_states;
  36   state->in_visited_states = 0;
  37   state->incomplete_comm_pattern = NULL;
  38   /* Stateful model checking */
  39   if((_sg_mc_checkpoint > 0 && (mc_stats->expanded_states % _sg_mc_checkpoint == 0)) ||  _sg_mc_termination){
  40     state->system_state = MC_take_snapshot(state->num);
  41     if(_sg_mc_comms_determinism || _sg_mc_send_determinism){
  42       MC_state_copy_incomplete_communications_pattern(state);
  43       MC_state_copy_index_communications_pattern(state);
  44     }
  45   }
  46   return state;
  47 }
  48
  49 /**
  50  * \brief Deletes a state data structure
  51  * \param trans The state to be deleted
  52  */
  53 void MC_state_delete(mc_state_t state, int free_snapshot){
  54   if (state->system_state && free_snapshot){
  55     delete state->system_state;
  56   }
  57   if(_sg_mc_comms_determinism || _sg_mc_send_determinism){
  58     xbt_free(state->index_comm);
  59     xbt_free(state->incomplete_comm_pattern);
  60   }
  61   xbt_free(state->proc_status);
  62   xbt_free(state);
  63 }
  64
  65 void MC_state_interleave_process(mc_state_t state, smx_process_t process)
  66 {
  67   assert(state);
  68   state->proc_status[process->pid].state = MC_INTERLEAVE;
  69   state->proc_status[process->pid].interleave_count = 0;
  70 }
  71
  72 void MC_state_remove_interleave_process(mc_state_t state, smx_process_t process)
  73 {
  74   if (state->proc_status[process->pid].state == MC_INTERLEAVE)
  75     state->proc_status[process->pid].state = MC_DONE;
  76 }
  77
  78 unsigned int MC_state_interleave_size(mc_state_t state)
  79 {
  80   unsigned int i, size = 0;
  81
  82   for (i = 0; i < state->max_pid; i++) {
  83     if ((state->proc_status[i].state == MC_INTERLEAVE)
  84         || (state->proc_status[i].state == MC_MORE_INTERLEAVE))
  85       size++;
  86   }
  87
  88   return size;
  89 }
  90
  91 int MC_state_process_is_done(mc_state_t state, smx_process_t process)
  92 {
  93   return state->proc_status[process->pid].state == MC_DONE ? TRUE : FALSE;
  94 }
  95
  96 void MC_state_set_executed_request(mc_state_t state, smx_simcall_t req,
  97                                    int value)
  98 {
  99   state->executed_req = *req;
 100   state->req_num = value;
 101
 102   smx_process_t process = NULL;
 103
 104   /* The waitany and testany request are transformed into a wait or test request over the
 105    * corresponding communication action so it can be treated later by the dependence
 106    * function. */
 107   switch (req->call) {
 108   case SIMCALL_COMM_WAITANY:
 109     state->internal_req.call = SIMCALL_COMM_WAIT;
 110     state->internal_req.issuer = req->issuer;
 111     read_element(mc_model_checker->process(),
 112       &state->internal_comm, remote(simcall_comm_waitany__get__comms(req)),
 113       value, sizeof(state->internal_comm));
 114     simcall_comm_wait__set__comm(&state->internal_req, &state->internal_comm);
 115     simcall_comm_wait__set__timeout(&state->internal_req, 0);
 116     break;
 117
 118   case SIMCALL_COMM_TESTANY:
 119     state->internal_req.call = SIMCALL_COMM_TEST;
 120     state->internal_req.issuer = req->issuer;
 121
 122     if (value > 0)
 123         read_element(mc_model_checker->process(),
 124           &state->internal_comm, remote(simcall_comm_testany__get__comms(req)),
 125           value, sizeof(state->internal_comm));
 126
 127     simcall_comm_test__set__comm(&state->internal_req, &state->internal_comm);
 128     simcall_comm_test__set__result(&state->internal_req, value);
 129     break;
 130
 131   case SIMCALL_COMM_WAIT:
 132     state->internal_req = *req;
 133     mc_model_checker->process().read_bytes(&state->internal_comm ,
 134       sizeof(state->internal_comm), remote(simcall_comm_wait__get__comm(req)));
 135     simcall_comm_wait__set__comm(&state->executed_req, &state->internal_comm);
 136     simcall_comm_wait__set__comm(&state->internal_req, &state->internal_comm);
 137     break;
 138
 139   case SIMCALL_COMM_TEST:
 140     state->internal_req = *req;
 141     mc_model_checker->process().read_bytes(&state->internal_comm,
 142       sizeof(state->internal_comm), remote(simcall_comm_test__get__comm(req)));
 143     simcall_comm_test__set__comm(&state->executed_req, &state->internal_comm);
 144     simcall_comm_test__set__comm(&state->internal_req, &state->internal_comm);
 145     break;
 146
 147   case SIMCALL_MC_RANDOM: {
 148     state->internal_req = *req;
 149     int random_max = simcall_mc_random__get__max(req);
 150     if (value != random_max) {
 151       MC_EACH_SIMIX_PROCESS(process,
 152         mc_procstate_t procstate = &state->proc_status[process->pid];
 153         const smx_process_t issuer = MC_smx_simcall_get_issuer(req);
 154         if (process->pid == issuer->pid) {
 155           procstate->state = MC_MORE_INTERLEAVE;
 156           break;
 157         }
 158       );
 159     }
 160     break;
 161   }
 162
 163   default:
 164     state->internal_req = *req;
 165     break;
 166   }
 167 }
 168
 169 smx_simcall_t MC_state_get_executed_request(mc_state_t state, int *value)
 170 {
 171   *value = state->req_num;
 172   return &state->executed_req;
 173 }
 174
 175 smx_simcall_t MC_state_get_internal_request(mc_state_t state)
 176 {
 177   return &state->internal_req;
 178 }
 179
 180 static inline smx_simcall_t MC_state_get_request_for_process(
 181   mc_state_t state, int*value, smx_process_t process)
 182 {
 183   mc_procstate_t procstate = &state->proc_status[process->pid];
 184
 185   if (procstate->state != MC_INTERLEAVE
 186       && procstate->state != MC_MORE_INTERLEAVE)
 187       return NULL;
 188   if (!MC_process_is_enabled(process))
 189     return NULL;
 190
 191   switch (process->simcall.call) {
 192
 193       case SIMCALL_COMM_WAITANY:
 194         *value = -1;
 195         while (procstate->interleave_count <
 196               read_length(mc_model_checker->process(),
 197                 remote(simcall_comm_waitany__get__comms(&process->simcall)))) {
 198           if (MC_request_is_enabled_by_idx
 199               (&process->simcall, procstate->interleave_count++)) {
 200             *value = procstate->interleave_count - 1;
 201             break;
 202           }
 203         }
 204
 205         if (procstate->interleave_count >=
 206             simgrid::mc::read_length(mc_model_checker->process(),
 207               simgrid::mc::remote(simcall_comm_waitany__get__comms(&process->simcall))))
 208           procstate->state = MC_DONE;
 209
 210         if (*value != -1)
 211           return &process->simcall;
 212
 213         break;
 214
 215       case SIMCALL_COMM_TESTANY: {
 216         unsigned start_count = procstate->interleave_count;
 217         *value = -1;
 218         while (procstate->interleave_count <
 219                 read_length(mc_model_checker->process(),
 220                   remote(simcall_comm_testany__get__comms(&process->simcall)))) {
 221           if (MC_request_is_enabled_by_idx
 222               (&process->simcall, procstate->interleave_count++)) {
 223             *value = procstate->interleave_count - 1;
 224             break;
 225           }
 226         }
 227
 228         if (procstate->interleave_count >=
 229             read_length(mc_model_checker->process(),
 230               remote(simcall_comm_testany__get__comms(&process->simcall))))
 231           procstate->state = MC_DONE;
 232
 233         if (*value != -1 || start_count == 0)
 234           return &process->simcall;
 235
 236         break;
 237       }
 238
 239       case SIMCALL_COMM_WAIT: {
 240         smx_synchro_t remote_act = simcall_comm_wait__get__comm(&process->simcall);
 241         s_smx_synchro_t act;
 242         mc_model_checker->process().read_bytes(
 243           &act, sizeof(act), remote(remote_act));
 244         if (act.comm.src_proc && act.comm.dst_proc) {
 245           *value = 0;
 246         } else {
 247           if (act.comm.src_proc == NULL && act.comm.type == SIMIX_COMM_READY
 248               && act.comm.detached == 1)
 249             *value = 0;
 250           else
 251             *value = -1;
 252         }
 253         procstate->state = MC_DONE;
 254         return &process->simcall;
 255       }
 256
 257       case SIMCALL_MC_RANDOM:
 258         if (procstate->state == MC_INTERLEAVE)
 259           *value = simcall_mc_random__get__min(&process->simcall);
 260         else {
 261           if (state->req_num < simcall_mc_random__get__max(&process->simcall))
 262             *value = state->req_num + 1;
 263         }
 264         procstate->state = MC_DONE;
 265         return &process->simcall;
 266
 267       default:
 268         procstate->state = MC_DONE;
 269         *value = 0;
 270         return &process->simcall;
 271   }
 272   return NULL;
 273 }
 274
 275 smx_simcall_t MC_state_get_request(mc_state_t state, int *value)
 276 {
 277   smx_process_t process = NULL;
 278   MC_EACH_SIMIX_PROCESS(process,
 279     smx_simcall_t res = MC_state_get_request_for_process(state, value, process);
 280     if (res)
 281       return res;
 282   );
 283
 284   return NULL;
 285 }
 286
 287 }