src/mc/mc_liveness.c

   1 /* Copyright (c) 2011-2014. 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 "mc_private.h"
   8 #include <unistd.h>
   9 #include <sys/wait.h>
  10
  11 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_liveness, mc,
  12                                 "Logging specific to algorithms for liveness properties verification");
  13
  14 /********* Global variables *********/
  15
  16 xbt_dynar_t acceptance_pairs;
  17 xbt_dynar_t successors;
  18 xbt_parmap_t parmap;
  19
  20 /********* Static functions *********/
  21
  22 static xbt_dynar_t get_atomic_propositions_values()
  23 {
  24   int res;
  25   int_f_void_t f;
  26   unsigned int cursor = 0;
  27   xbt_automaton_propositional_symbol_t ps = NULL;
  28   xbt_dynar_t values = xbt_dynar_new(sizeof(int), NULL);
  29
  30   xbt_dynar_foreach(_mc_property_automaton->propositional_symbols, cursor, ps) {
  31     f = (int_f_void_t) ps->function;
  32     res = f();
  33     xbt_dynar_push_as(values, int, res);
  34   }
  35
  36   return values;
  37 }
  38
  39
  40 static mc_visited_pair_t is_reached_acceptance_pair(int pair_num,
  41                                                     xbt_automaton_state_t
  42                                                     automaton_state,
  43                                                     xbt_dynar_t
  44                                                     atomic_propositions)
  45 {
  46
  47   int raw_mem_set = (mmalloc_get_current_heap() == mc_heap);
  48
  49   MC_SET_MC_HEAP;
  50
  51   mc_visited_pair_t pair = NULL;
  52   pair = MC_visited_pair_new(pair_num, automaton_state, atomic_propositions);
  53   pair->acceptance_pair = 1;
  54
  55   if (xbt_dynar_is_empty(acceptance_pairs)) {
  56
  57     xbt_dynar_push(acceptance_pairs, &pair);
  58
  59   } else {
  60
  61     int min = -1, max = -1, index;
  62     //int res;
  63     mc_visited_pair_t pair_test;
  64     int cursor;
  65
  66     index = get_search_interval(acceptance_pairs, pair, &min, &max);
  67
  68     if (min != -1 && max != -1) {       // Acceptance pair with same number of processes and same heap bytes used exists
  69
  70       // Parallell implementation
  71       /*res = xbt_parmap_mc_apply(parmap, snapshot_compare, xbt_dynar_get_ptr(acceptance_pairs, min), (max-min)+1, pair);
  72          if(res != -1){
  73          if(!raw_mem_set)
  74          MC_SET_STD_HEAP;
  75          return ((mc_pair_t)xbt_dynar_get_as(acceptance_pairs, (min+res)-1, mc_pair_t))->num;
  76          } */
  77
  78       cursor = min;
  79       while (cursor <= max) {
  80         pair_test =
  81             (mc_visited_pair_t) xbt_dynar_get_as(acceptance_pairs, cursor,
  82                                                  mc_visited_pair_t);
  83         if (xbt_automaton_state_compare
  84             (pair_test->automaton_state, pair->automaton_state) == 0) {
  85           if (xbt_automaton_propositional_symbols_compare_value
  86               (pair_test->atomic_propositions,
  87                pair->atomic_propositions) == 0) {
  88             if (snapshot_compare(pair_test, pair) == 0) {
  89               XBT_INFO("Pair %d already reached (equal to pair %d) !",
  90                        pair->num, pair_test->num);
  91
  92               xbt_fifo_shift(mc_stack);
  93               if (dot_output != NULL)
  94                 fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n",
  95                         initial_global_state->prev_pair, pair_test->num,
  96                         initial_global_state->prev_req);
  97
  98               if (!raw_mem_set)
  99                 MC_SET_STD_HEAP;
 100
 101               return NULL;
 102             }
 103           }
 104         }
 105         cursor++;
 106       }
 107       xbt_dynar_insert_at(acceptance_pairs, min, &pair);
 108     } else {
 109       pair_test =
 110           (mc_visited_pair_t) xbt_dynar_get_as(acceptance_pairs, index,
 111                                                mc_visited_pair_t);
 112       if (pair_test->nb_processes < pair->nb_processes) {
 113         xbt_dynar_insert_at(acceptance_pairs, index + 1, &pair);
 114       } else {
 115         if (pair_test->heap_bytes_used < pair->heap_bytes_used)
 116           xbt_dynar_insert_at(acceptance_pairs, index + 1, &pair);
 117         else
 118           xbt_dynar_insert_at(acceptance_pairs, index, &pair);
 119       }
 120     }
 121
 122   }
 123
 124   if (!raw_mem_set)
 125     MC_SET_STD_HEAP;
 126
 127   return pair;
 128
 129 }
 130
 131 static void remove_acceptance_pair(int pair_num)
 132 {
 133
 134   int raw_mem_set = (mmalloc_get_current_heap() == mc_heap);
 135
 136   MC_SET_MC_HEAP;
 137
 138   unsigned int cursor = 0;
 139   mc_visited_pair_t pair_test = NULL;
 140
 141   xbt_dynar_foreach(acceptance_pairs, cursor, pair_test) {
 142     if (pair_test->num == pair_num) {
 143       break;
 144     }
 145   }
 146
 147   xbt_dynar_remove_at(acceptance_pairs, cursor, &pair_test);
 148
 149   pair_test->acceptance_removed = 1;
 150
 151   if (_sg_mc_visited == 0) {
 152     MC_visited_pair_delete(pair_test);
 153   } else if (pair_test->visited_removed == 1) {
 154     MC_visited_pair_delete(pair_test);
 155   }
 156
 157   if (!raw_mem_set)
 158     MC_SET_STD_HEAP;
 159 }
 160
 161
 162 static int MC_automaton_evaluate_label(xbt_automaton_exp_label_t l,
 163                                        xbt_dynar_t atomic_propositions_values)
 164 {
 165
 166   switch (l->type) {
 167   case 0:{
 168       int left_res =
 169           MC_automaton_evaluate_label(l->u.or_and.left_exp,
 170                                       atomic_propositions_values);
 171       int right_res =
 172           MC_automaton_evaluate_label(l->u.or_and.right_exp,
 173                                       atomic_propositions_values);
 174       return (left_res || right_res);
 175     }
 176   case 1:{
 177       int left_res =
 178           MC_automaton_evaluate_label(l->u.or_and.left_exp,
 179                                       atomic_propositions_values);
 180       int right_res =
 181           MC_automaton_evaluate_label(l->u.or_and.right_exp,
 182                                       atomic_propositions_values);
 183       return (left_res && right_res);
 184     }
 185   case 2:{
 186       int res =
 187           MC_automaton_evaluate_label(l->u.exp_not, atomic_propositions_values);
 188       return (!res);
 189     }
 190   case 3:{
 191       unsigned int cursor = 0;
 192       xbt_automaton_propositional_symbol_t p = NULL;
 193       xbt_dynar_foreach(_mc_property_automaton->propositional_symbols, cursor,
 194                         p) {
 195         if (strcmp(p->pred, l->u.predicat) == 0)
 196           return (int) xbt_dynar_get_as(atomic_propositions_values, cursor,
 197                                         int);
 198       }
 199       return -1;
 200     }
 201   case 4:{
 202       return 2;
 203     }
 204   default:
 205     return -1;
 206   }
 207 }
 208
 209 void MC_pre_modelcheck_liveness(void)
 210 {
 211
 212   initial_global_state->raw_mem_set = (mmalloc_get_current_heap() == mc_heap);
 213
 214   mc_pair_t initial_pair = NULL;
 215   smx_process_t process;
 216
 217   MC_wait_for_requests();
 218
 219   MC_SET_MC_HEAP;
 220
 221   acceptance_pairs = xbt_dynar_new(sizeof(mc_visited_pair_t), NULL);
 222   visited_pairs = xbt_dynar_new(sizeof(mc_visited_pair_t), NULL);
 223   successors = xbt_dynar_new(sizeof(mc_pair_t), NULL);
 224
 225   initial_global_state->snapshot = MC_take_snapshot(0);
 226   initial_global_state->prev_pair = 0;
 227
 228   MC_SET_STD_HEAP;
 229
 230   unsigned int cursor = 0;
 231   xbt_automaton_state_t automaton_state;
 232
 233   xbt_dynar_foreach(_mc_property_automaton->states, cursor, automaton_state) {
 234     if (automaton_state->type == -1) {  /* Initial automaton state */
 235
 236       MC_SET_MC_HEAP;
 237
 238       initial_pair = MC_pair_new();
 239       initial_pair->automaton_state = automaton_state;
 240       initial_pair->graph_state = MC_state_new();
 241       initial_pair->atomic_propositions = get_atomic_propositions_values();
 242
 243       /* Get enabled process and insert it in the interleave set of the graph_state */
 244       xbt_swag_foreach(process, simix_global->process_list) {
 245         if (MC_process_is_enabled(process)) {
 246           MC_state_interleave_process(initial_pair->graph_state, process);
 247         }
 248       }
 249
 250       initial_pair->requests =
 251           MC_state_interleave_size(initial_pair->graph_state);
 252       initial_pair->search_cycle = 0;
 253
 254       xbt_fifo_unshift(mc_stack, initial_pair);
 255
 256       MC_SET_STD_HEAP;
 257
 258       MC_modelcheck_liveness();
 259
 260       if (cursor != 0) {
 261         MC_restore_snapshot(initial_global_state->snapshot);
 262         MC_SET_STD_HEAP;
 263       }
 264     }
 265   }
 266
 267   if (initial_global_state->raw_mem_set)
 268     MC_SET_MC_HEAP;
 269   else
 270     MC_SET_STD_HEAP;
 271
 272
 273 }
 274
 275
 276 void MC_modelcheck_liveness()
 277 {
 278
 279   smx_process_t process;
 280   mc_pair_t current_pair = NULL;
 281
 282   if (xbt_fifo_size(mc_stack) == 0)
 283     return;
 284
 285   /* Get current pair */
 286   current_pair =
 287       (mc_pair_t) xbt_fifo_get_item_content(xbt_fifo_get_first_item(mc_stack));
 288
 289   /* Update current state in buchi automaton */
 290   _mc_property_automaton->current_state = current_pair->automaton_state;
 291
 292   XBT_DEBUG
 293       ("********************* ( Depth = %d, search_cycle = %d, interleave size %d, pair_num %d)",
 294        xbt_fifo_size(mc_stack), current_pair->search_cycle,
 295        MC_state_interleave_size(current_pair->graph_state), current_pair->num);
 296
 297   mc_stats->visited_pairs++;
 298
 299   int value;
 300   smx_simcall_t req = NULL;
 301   char *req_str;
 302
 303   xbt_automaton_transition_t transition_succ;
 304   unsigned int cursor = 0;
 305   int res;
 306   int visited_num;
 307
 308   mc_pair_t next_pair = NULL;
 309   xbt_dynar_t prop_values = NULL;
 310   mc_visited_pair_t reached_pair = NULL;
 311   int counter_example_depth = 0;
 312
 313   if (xbt_fifo_size(mc_stack) < _sg_mc_max_depth) {
 314
 315     if (current_pair->requests > 0) {
 316
 317       if (current_pair->search_cycle) {
 318
 319         if ((current_pair->automaton_state->type == 1)
 320             || (current_pair->automaton_state->type == 2)) {
 321           if ((reached_pair =
 322                is_reached_acceptance_pair(current_pair->num,
 323                                           current_pair->automaton_state,
 324                                           current_pair->atomic_propositions)) ==
 325               NULL) {
 326
 327             counter_example_depth = xbt_fifo_size(mc_stack);
 328             XBT_INFO("*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*");
 329             XBT_INFO("|             ACCEPTANCE CYCLE            |");
 330             XBT_INFO("*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*");
 331             XBT_INFO("Counter-example that violates formula :");
 332             MC_show_stack_liveness(mc_stack);
 333             MC_dump_stack_liveness(mc_stack);
 334             MC_print_statistics(mc_stats);
 335             XBT_INFO("Counter-example depth : %d", counter_example_depth);
 336             xbt_abort();
 337
 338           }
 339         }
 340       }
 341
 342       if ((visited_num =
 343            is_visited_pair(reached_pair, current_pair->num,
 344                            current_pair->automaton_state,
 345                            current_pair->atomic_propositions)) != -1) {
 346
 347         MC_SET_MC_HEAP;
 348         if (dot_output != NULL)
 349           fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n",
 350                   initial_global_state->prev_pair, visited_num,
 351                   initial_global_state->prev_req);
 352         MC_SET_STD_HEAP;
 353
 354       } else {
 355
 356         while ((req =
 357                 MC_state_get_request(current_pair->graph_state,
 358                                      &value)) != NULL) {
 359
 360           MC_SET_MC_HEAP;
 361           if (dot_output != NULL) {
 362             if (initial_global_state->prev_pair != 0
 363                 && initial_global_state->prev_pair != current_pair->num) {
 364               fprintf(dot_output, "\"%d\" -> \"%d\" [%s];\n",
 365                       initial_global_state->prev_pair, current_pair->num,
 366                       initial_global_state->prev_req);
 367               xbt_free(initial_global_state->prev_req);
 368             }
 369             initial_global_state->prev_pair = current_pair->num;
 370           }
 371           MC_SET_STD_HEAP;
 372
 373           /* Debug information */
 374           if (XBT_LOG_ISENABLED(mc_liveness, xbt_log_priority_debug)) {
 375             req_str = MC_request_to_string(req, value);
 376             XBT_DEBUG("Execute: %s", req_str);
 377             xbt_free(req_str);
 378           }
 379
 380           MC_SET_MC_HEAP;
 381           if (dot_output != NULL) {
 382             initial_global_state->prev_req =
 383                 MC_request_get_dot_output(req, value);
 384             if (current_pair->search_cycle)
 385               fprintf(dot_output, "%d [shape=doublecircle];\n",
 386                       current_pair->num);
 387           }
 388           MC_SET_STD_HEAP;
 389
 390           MC_state_set_executed_request(current_pair->graph_state, req, value);
 391           mc_stats->executed_transitions++;
 392
 393           /* Answer the request */
 394           SIMIX_simcall_pre(req, value);
 395
 396           /* Wait for requests (schedules processes) */
 397           MC_wait_for_requests();
 398
 399           MC_SET_MC_HEAP;
 400           prop_values = get_atomic_propositions_values();
 401           MC_SET_STD_HEAP;
 402
 403           int new_pair = 0;
 404
 405           /* Evaluate enabled transition according to atomic propositions values */
 406           cursor = 0;
 407           xbt_dynar_foreach(current_pair->automaton_state->out, cursor,
 408                             transition_succ) {
 409
 410             res =
 411                 MC_automaton_evaluate_label(transition_succ->label,
 412                                             prop_values);
 413
 414             if (res == 1) {     // enabled transition in automaton
 415
 416               if (new_pair)
 417                 MC_replay_liveness(mc_stack, 1);
 418
 419               MC_SET_MC_HEAP;
 420
 421               next_pair = MC_pair_new();
 422               next_pair->graph_state = MC_state_new();
 423               next_pair->automaton_state = transition_succ->dst;
 424               next_pair->atomic_propositions = get_atomic_propositions_values();
 425
 426               /* Get enabled process and insert it in the interleave set of the next graph_state */
 427               xbt_swag_foreach(process, simix_global->process_list) {
 428                 if (MC_process_is_enabled(process)) {
 429                   MC_state_interleave_process(next_pair->graph_state, process);
 430                 }
 431               }
 432
 433               next_pair->requests =
 434                   MC_state_interleave_size(next_pair->graph_state);
 435
 436               if (next_pair->automaton_state->type == 1
 437                   || next_pair->automaton_state->type == 2
 438                   || current_pair->search_cycle)
 439                 next_pair->search_cycle = 1;
 440
 441               xbt_fifo_unshift(mc_stack, next_pair);
 442
 443               if (mc_stats->expanded_pairs % 1000000 == 0)
 444                 XBT_INFO("Expanded pairs : %lu", mc_stats->expanded_pairs);
 445
 446               MC_SET_STD_HEAP;
 447
 448               new_pair = 1;
 449
 450               MC_modelcheck_liveness();
 451
 452             }
 453
 454           }
 455
 456           /* Then, evaluate true transitions (always true, whatever atomic propositions values) */
 457           cursor = 0;
 458           xbt_dynar_foreach(current_pair->automaton_state->out, cursor,
 459                             transition_succ) {
 460
 461             res =
 462                 MC_automaton_evaluate_label(transition_succ->label,
 463                                             prop_values);
 464
 465             if (res == 2) {     // true transition in automaton
 466
 467               if (new_pair)
 468                 MC_replay_liveness(mc_stack, 1);
 469
 470               MC_SET_MC_HEAP;
 471
 472               next_pair = MC_pair_new();
 473               next_pair->graph_state = MC_state_new();
 474               next_pair->automaton_state = transition_succ->dst;
 475               next_pair->atomic_propositions = get_atomic_propositions_values();
 476
 477               /* Get enabled process and insert it in the interleave set of the next graph_state */
 478               xbt_swag_foreach(process, simix_global->process_list) {
 479                 if (MC_process_is_enabled(process)) {
 480                   MC_state_interleave_process(next_pair->graph_state, process);
 481                 }
 482               }
 483
 484               next_pair->requests =
 485                   MC_state_interleave_size(next_pair->graph_state);
 486
 487               if (next_pair->automaton_state->type == 1
 488                   || next_pair->automaton_state->type == 2
 489                   || current_pair->search_cycle)
 490                 next_pair->search_cycle = 1;
 491
 492               xbt_fifo_unshift(mc_stack, next_pair);
 493
 494               if (mc_stats->expanded_pairs % 1000000 == 0)
 495                 XBT_INFO("Expanded pairs : %lu", mc_stats->expanded_pairs);
 496
 497               MC_SET_STD_HEAP;
 498
 499               new_pair = 1;
 500
 501               MC_modelcheck_liveness();
 502
 503             }
 504
 505           }
 506
 507           if (MC_state_interleave_size(current_pair->graph_state) > 0) {
 508             XBT_DEBUG("Backtracking to depth %d", xbt_fifo_size(mc_stack));
 509             MC_replay_liveness(mc_stack, 0);
 510           }
 511
 512         }
 513
 514       }
 515
 516     }
 517
 518   } else {
 519
 520     XBT_WARN("/!\\ Max depth reached ! /!\\ ");
 521     if (MC_state_interleave_size(current_pair->graph_state) > 0) {
 522       XBT_WARN
 523           ("/!\\ But, there are still processes to interleave. Model-checker will not be able to ensure the soundness of the verification from now. /!\\ ");
 524       if (_sg_mc_max_depth == 1000)
 525         XBT_WARN
 526             ("Notice : the default value of max depth is 1000 but you can change it with cfg=model-check/max_depth:value.");
 527     }
 528
 529   }
 530
 531   if (xbt_fifo_size(mc_stack) == _sg_mc_max_depth) {
 532     XBT_DEBUG("Pair %d (depth = %d) shifted in stack, maximum depth reached",
 533               current_pair->num, xbt_fifo_size(mc_stack));
 534   } else {
 535     XBT_DEBUG("Pair %d (depth = %d) shifted in stack", current_pair->num,
 536               xbt_fifo_size(mc_stack));
 537   }
 538
 539
 540   MC_SET_MC_HEAP;
 541   xbt_dynar_free(&prop_values);
 542   current_pair = xbt_fifo_shift(mc_stack);
 543   if (xbt_fifo_size(mc_stack) != _sg_mc_max_depth - 1
 544       && current_pair->requests > 0 && current_pair->search_cycle) {
 545     remove_acceptance_pair(current_pair->num);
 546   }
 547   MC_pair_delete(current_pair);
 548
 549   MC_SET_STD_HEAP;
 550
 551 }