X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/403e0e03205591d9b723d0f032fe9b72651066b4..5ff7a0f00eab7d7005451ad66f517ac9c4bfd68a:/src/mc/mc_liveness.c

diff --git a/src/mc/mc_liveness.c b/src/mc/mc_liveness.c
index c693825661..08ee45f0f1 100644
--- a/src/mc/mc_liveness.c
+++ b/src/mc/mc_liveness.c
@@ -1,20 +1,149 @@
-#include "private.h"
-#include "unistd.h"
+/* Copyright (c) 2008-2012 Da SimGrid Team. All rights reserved.            */
+
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
+#include "mc_private.h"
+#include <unistd.h>
 
 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_liveness, mc,
                                 "Logging specific to algorithms for liveness properties verification");
 
-xbt_dynar_t initial_pairs = NULL;
-xbt_fifo_t reached_pairs;
-xbt_dynar_t successors = NULL;
-extern mc_snapshot_t initial_snapshot;
+xbt_dynar_t reached_pairs;
+xbt_dynar_t reached_pairs_hash;
+xbt_dynar_t visited_pairs;
+xbt_dynar_t visited_pairs_hash;
+xbt_dynar_t successors;
+
+xbt_dynar_t hosts_table;
+
 
-int snapshot_compare(mc_snapshot_t s1, mc_snapshot_t s2){
+/* fast implementation of djb2 algorithm */
+unsigned int hash_region(char *str, int str_len){
+
+  int c;
+  register unsigned int hash = 5381;
+
+  while (str_len--) {
+    c = *str++;
+    hash = ((hash << 5) + hash) + c;    /* hash * 33 + c */
+  }
+
+  return hash;
+
+}
+
+const char* get_memory_map_addr(void *addr){
+
+  FILE *fp;                     /* File pointer to process's proc maps file */
+  char *line = NULL;            /* Temporal storage for each line that is readed */
+  ssize_t read;                 /* Number of bytes readed */
+  size_t n = 0;                 /* Amount of bytes to read by getline */
+
+  fp = fopen("/proc/self/maps", "r");
+  
+  if(fp == NULL)
+    perror("fopen failed");
+
+  if(addr == NULL){
+    free(line);
+    fclose(fp);
+    return "nil";
+  }
+
+  xbt_dynar_t lfields = NULL;
+  xbt_dynar_t start_end  = NULL;
+  void *start_addr;
+  void *end_addr;
+
+  while ((read = getline(&line, &n, fp)) != -1) {
+
+    xbt_str_trim(line, NULL);
+    xbt_str_strip_spaces(line);
+    lfields = xbt_str_split(line,NULL);
+
+    start_end = xbt_str_split(xbt_dynar_get_as(lfields, 0, char*), "-");
+    start_addr = (void *) strtoul(xbt_dynar_get_as(start_end, 0, char*), NULL, 16);
+    end_addr = (void *) strtoul(xbt_dynar_get_as(start_end, 1, char*), NULL, 16);
+
+    if((addr > start_addr) && ( addr < end_addr)){
+      free(line);
+      fclose(fp);
+      if(start_addr == std_heap)
+	return "std_heap";
+      if(start_addr == raw_heap)
+	return "raw_heap";
+      if(xbt_dynar_length(lfields) == 6)
+	return xbt_dynar_get_as(lfields, xbt_dynar_length(lfields) - 1, char*);
+      else
+	return "Anonymous";
+    }
+
+  }
+
+  free(line);
+  fclose(fp);
+  return "Unknown area";
+
+}
+
+int data_program_region_compare(void *d1, void *d2, size_t size){
+  int distance = 0;
+  int pointer_align;
+  int i;
+  char *pointed_address1 = NULL, *pointed_address2 = NULL;
+  
+  for(i=0; i<size; i++){
+    if(memcmp(((char *)d1) + i, ((char *)d2) + i, 1) != 0){
+      fprintf(stderr,"Different byte (offset=%d) (%p - %p) in data program region\n", i, (char *)d1 + i, (char *)d2 + i);
+      distance++;
+      pointer_align = (i /sizeof(void *)) * sizeof(void *);
+      pointed_address1 = strdup(get_memory_map_addr(*((void **)((char *)d1 + pointer_align))));
+      pointed_address2 = strdup(get_memory_map_addr(*((void **)((char *)d2 + pointer_align))));
+      fprintf(stderr, "Pointed address : %p (in %s) - %p (in %s)\n", *((void **)((char *)d1 + pointer_align)), pointed_address1, *((void **)((char *)d2 + pointer_align)), pointed_address2);
+      /* FIXME : compare values in pointed address thanks to DWARF */
+    }
+  }
+  
+  fprintf(stderr, "Hamming distance between data program regions : %d\n", distance);
+
+  free(pointed_address1);
+  free(pointed_address2);
+
+  return distance;
+}
+
+int data_libsimgrid_region_compare(void *d1, void *d2, size_t size){
+  int distance = 0;
+  int pointer_align;
+  int i;
+  char *pointed_address1 = NULL, *pointed_address2 = NULL;
+  
+  for(i=0; i<size; i++){
+    if(memcmp(((char *)d1) + i, ((char *)d2) + i, 1) != 0){
+      fprintf(stderr, "Different byte (offset=%d) (%p - %p) in data libsimgrid region\n", i, (char *)d1 + i, (char *)d2 + i);
+      distance++;
+      pointer_align = (i /sizeof(void *)) * sizeof(void *);
+      pointed_address1 = strdup(get_memory_map_addr(*((void **)((char *)d1 + pointer_align))));
+      pointed_address2 = strdup(get_memory_map_addr(*((void **)((char *)d2 + pointer_align))));
+      fprintf(stderr, "Pointed address : %p (in %s) - %p (in %s)\n", *((void **)((char *)d1 + pointer_align)), pointed_address1, *((void **)((char *)d2 + pointer_align)), pointed_address2);
+      /* FIXME : compare values in pointed address thanks to DWARF */
+    }
+  }
+  
+  fprintf(stderr, "Hamming distance between data libsimgrid regions : %d\n", distance);
+
+  free(pointed_address1);
+  free(pointed_address2);
+  
+  return distance;
+}
+
+int snapshot_compare(mc_snapshot_t s1, mc_snapshot_t s2, void* s_heap, void* r_heap){
 
-  XBT_DEBUG("Compare snapshot");
   
   if(s1->num_reg != s2->num_reg){
-    XBT_DEBUG("Different num_reg");
+    XBT_INFO("Different num_reg (s1 = %u, s2 = %u)", s1->num_reg, s2->num_reg);
     return 1;
   }
 
@@ -22,116 +151,683 @@ int snapshot_compare(mc_snapshot_t s1, mc_snapshot_t s2){
   int errors = 0;
 
   for(i=0 ; i< s1->num_reg ; i++){
-    
-    if(s1->regions[i]->size != s2->regions[i]->size){
-      XBT_DEBUG("Different size of region");
-      return 1;
-    }
-    
-    if(s1->regions[i]->start_addr != s2->regions[i]->start_addr){
-      XBT_DEBUG("Different start addr of region");
-      return 1;
-    }
-    
+
     if(s1->regions[i]->type != s2->regions[i]->type){
-      XBT_DEBUG("Different type of region");
-      return 1;
+	XBT_INFO("Different type of region");
+	errors++;
     }
 
-
-    if(s1->regions[i]->type == 0){ 
-      if(mmalloc_compare_heap(s1->regions[i]->start_addr, s2->regions[i]->start_addr)){
-	XBT_DEBUG("Different heap (mmalloc_compare)");
+    switch(s1->regions[i]->type){
+      case 0:
+      if(s1->regions[i]->size != s2->regions[i]->size){
+	XBT_INFO("Different size of heap (s1 = %zu, s2 = %zu)", s1->regions[i]->size, s2->regions[i]->size);
+	errors++;
+      }
+      if(s1->regions[i]->start_addr != s2->regions[i]->start_addr){
+	XBT_INFO("Different start addr of heap (s1 = %p, s2 = %p)", s1->regions[i]->start_addr, s2->regions[i]->start_addr);
+	errors++;
+      }
+      if(mmalloc_compare_heap(s1->regions[i]->data, s2->regions[i]->data, s_heap, r_heap)){
+	XBT_INFO("Different heap (mmalloc_compare)");
 	errors++; 
       }
-    }else{
-      if(memcmp(s1->regions[i]->data, s2->regions[i]->data, s1->regions[i]->size) != 0){
-    	XBT_DEBUG("Different memcmp for data in libsimgrid or program");
-    	errors++;
+      break;
+    case 1 :
+      if(s1->regions[i]->size != s2->regions[i]->size){
+	XBT_INFO("Different size of libsimgrid (s1 = %zu, s2 = %zu)", s1->regions[i]->size, s2->regions[i]->size);
+	errors++;
+      }
+      if(s1->regions[i]->start_addr != s2->regions[i]->start_addr){
+	XBT_INFO("Different start addr of libsimgrid (s1 = %p, s2 = %p)", s1->regions[i]->start_addr, s2->regions[i]->start_addr);
+	errors++;
+      }
+      if(data_libsimgrid_region_compare(s1->regions[i]->data, s2->regions[i]->data, s1->regions[i]->size) != 0){
+	XBT_INFO("Different memcmp for data in libsimgrid");
+	errors++;
+      }
+      break;
+    case 2 :
+      if(s1->regions[i]->size != s2->regions[i]->size){
+	XBT_INFO("Different size of data program (s1 = %zu, s2 = %zu)", s1->regions[i]->size, s2->regions[i]->size);
+	errors++;
       }
+      if(s1->regions[i]->start_addr != s2->regions[i]->start_addr){
+	XBT_INFO("Different start addr of data program (s1 = %p, s2 = %p)", s1->regions[i]->start_addr, s2->regions[i]->start_addr);
+	errors++;
+      }
+      if(data_program_region_compare(s1->regions[i]->data, s2->regions[i]->data, s1->regions[i]->size) != 0){
+	XBT_INFO("Different memcmp for data in program");
+	errors++;
+      }
+      break;
+    default:
+      break;
     }
+  }
+
+  return (errors > 0);
+  
+}
+
+int reached(xbt_state_t st){
+
+
+  if(xbt_dynar_is_empty(reached_pairs)){
+
+    return 0;
+
+  }else{
+
+    MC_SET_RAW_MEM;
+
+    mc_snapshot_t sn = xbt_new0(s_mc_snapshot_t, 1);
+    MC_take_snapshot_liveness(sn);    
     
+    xbt_dynar_t prop_ato = xbt_dynar_new(sizeof(int), NULL);
+    int res;
+    int_f_void_t f;
+
+    /* Get values of propositional symbols */
+    unsigned int cursor = 0;
+    xbt_propositional_symbol_t ps = NULL;
+    xbt_dynar_foreach(automaton->propositional_symbols, cursor, ps){
+      f = (int_f_void_t)ps->function;
+      res = (*f)();
+      xbt_dynar_push_as(prop_ato, int, res);
+    }
+
+    cursor = 0;
+    mc_pair_reached_t pair_test = NULL;
+
+    //xbt_dict_t current_rdv_points = SIMIX_get_rdv_points();
+     
+    xbt_dynar_foreach(reached_pairs, cursor, pair_test){
+      XBT_INFO("Pair reached #%d", pair_test->nb);
+      if(automaton_state_compare(pair_test->automaton_state, st) == 0){
+	if(propositional_symbols_compare_value(pair_test->prop_ato, prop_ato) == 0){
+	  //XBT_INFO("Rdv points size %d - %d", xbt_dict_length(pair_test->rdv_points), xbt_dict_length(current_rdv_points));
+	  //if(xbt_dict_length(pair_test->rdv_points) == xbt_dict_length(current_rdv_points)){
+	  //if(rdv_points_compare(pair_test->rdv_points, current_rdv_points) == 0){
+	  if(snapshot_compare(pair_test->system_state, sn, std_heap, raw_heap) == 0){
+	   
+	    MC_free_snapshot(sn);
+	    xbt_dynar_reset(prop_ato);
+	    xbt_free(prop_ato);
+	    MC_UNSET_RAW_MEM;
+	    return 1;
+	  }
+	  /* }
+	  }else{
+	    XBT_INFO("Different size of rdv points (%d - %d)",xbt_dict_length(pair_test->rdv_points), xbt_dict_length(current_rdv_points) );
+	    }*/
+	}else{
+	  XBT_INFO("Different values of propositional symbols");
+	}
+      }else{
+	XBT_INFO("Different automaton state");
+      }
+    }
+
+    MC_free_snapshot(sn);
+    xbt_dynar_reset(prop_ato);
+    xbt_free(prop_ato);
+    MC_UNSET_RAW_MEM;
+    return 0;
     
   }
+}
+
+int rdv_points_compare(xbt_dict_t d1, xbt_dict_t d2){ /* d1 = pair_test, d2 = current_pair */ 
+  
+   xbt_dict_cursor_t cursor_dict = NULL;
+   char *key;
+   char *data;
+   smx_rdv_t rdv1, rdv2;
+   xbt_fifo_item_t item1, item2;
+   smx_action_t action1, action2;
+   xbt_fifo_item_t item_req1, item_req2;
+   smx_simcall_t req1, req2;
+   int i=0;
+   int j=0;
+
+   xbt_dict_foreach(d1, cursor_dict, key, data){
+     rdv1 = (smx_rdv_t)data;
+     rdv2 = xbt_dict_get_or_null(d2, rdv1->name);
+     if(rdv2 == NULL){
+       XBT_INFO("Rdv point unknown");
+       return 1;
+     }else{
+       if(xbt_fifo_size(rdv1->comm_fifo) != xbt_fifo_size(rdv2->comm_fifo)){
+	 XBT_INFO("Different total of actions in mailbox \"%s\" (%d - %d)", rdv1->name, xbt_fifo_size(rdv1->comm_fifo),xbt_fifo_size(rdv2->comm_fifo) );
+	 return 1;
+       }else{
+	 
+	 XBT_INFO("Total of actions in mailbox \"%s\" : %d", rdv1->name, xbt_fifo_size(rdv1->comm_fifo)); 
+	 
+	 item1 = xbt_fifo_get_first_item(rdv1->comm_fifo);	
+	 item2 = xbt_fifo_get_first_item(rdv2->comm_fifo);
+
+	 while(i<xbt_fifo_size(rdv1->comm_fifo)){
+	   action1 = (smx_action_t) xbt_fifo_get_item_content(item1);
+	   action2 = (smx_action_t) xbt_fifo_get_item_content(item2);
+
+	   if(action1->type != action2->type){
+	     XBT_INFO("Different type of action");
+	     return 1;
+	   }
+
+	   if(action1->state != action2->state){
+	     XBT_INFO("Different state of action");
+	     return 1;
+	   }
+
+	   if(xbt_fifo_size(action1->simcalls) != xbt_fifo_size(action2->simcalls)){
+	     XBT_INFO("Different size of simcall list (%d - %d", xbt_fifo_size(action1->simcalls), xbt_fifo_size(action2->simcalls));
+	     return 1;
+	   }else{
+
+	     item_req1 = xbt_fifo_get_first_item(action1->simcalls);	
+	     item_req2 = xbt_fifo_get_first_item(action2->simcalls);
+
+	     while(j<xbt_fifo_size(action1->simcalls)){
+
+	       req1 = (smx_simcall_t) xbt_fifo_get_item_content(item_req1);
+	       req2 = (smx_simcall_t) xbt_fifo_get_item_content(item_req2);
+	       
+	       if(req1->call != req2->call){
+		 XBT_INFO("Different simcall call in simcalls of action (%d - %d)", (int)req1->call, (int)req2->call);
+		 return 1;
+	       }
+	       if(req1->issuer->pid != req2->issuer->pid){
+		 XBT_INFO("Different simcall issuer in simcalls of action (%lu- %lu)", req1->issuer->pid, req2->issuer->pid);
+		 return 1;
+	       }
+
+	       item_req1 = xbt_fifo_get_next_item(item_req1);	
+	       item_req2 = xbt_fifo_get_next_item(item_req2);
+	       j++;
+	       
+	     }
+	   }
+
+	   switch(action1->type){
+	   case 0: /* execution */
+	   case 1: /* parallel execution */
+	     if(strcmp(action1->execution.host->name, action2->execution.host->name) != 0)
+	       return 1;
+	     break;
+	   case 2: /* comm */
+	     if(action1->comm.type != action2->comm.type)
+	       return 1;
+	     //XBT_INFO("Type of comm : %d", action1->comm.type);
+	     
+	     switch(action1->comm.type){
+	     case 0: /* SEND */
+	       if(action1->comm.src_proc->pid != action2->comm.src_proc->pid)
+		 return 1;
+	       if(strcmp(action1->comm.src_proc->smx_host->name, action2->comm.src_proc->smx_host->name) != 0)
+		 return 1;
+	       break;
+	     case 1: /* RECEIVE */
+	       if(action1->comm.dst_proc->pid != action2->comm.dst_proc->pid)
+		 return 1;
+	       if(strcmp(action1->comm.dst_proc->smx_host->name, action2->comm.dst_proc->smx_host->name) != 0)
+		 return 1;
+	       break;
+	     case 2: /* READY */
+	       if(action1->comm.src_proc->pid != action2->comm.src_proc->pid)
+		 return 1;
+	       if(strcmp(action1->comm.src_proc->smx_host->name, action2->comm.src_proc->smx_host->name) != 0)
+		 return 1;
+	       if(action1->comm.dst_proc->pid != action2->comm.dst_proc->pid)
+		 return 1;
+	       if(strcmp(action1->comm.dst_proc->smx_host->name, action2->comm.dst_proc->smx_host->name) != 0)
+		 return 1;
+	       break;
+	     case 3: /* DONE */
+	       if(action1->comm.src_proc->pid != action2->comm.src_proc->pid)
+		 return 1;
+	       if(strcmp(action1->comm.src_proc->smx_host->name, action2->comm.src_proc->smx_host->name) != 0)
+		 return 1;
+	       if(action1->comm.dst_proc->pid != action2->comm.dst_proc->pid)
+		 return 1;
+	       if(strcmp(action1->comm.dst_proc->smx_host->name, action2->comm.dst_proc->smx_host->name) != 0)
+		 return 1;
+	       break;
+	       
+	     } /* end of switch on type of comm */
+	     
+	     if(action1->comm.refcount != action2->comm.refcount)
+	       return 1;
+	     if(action1->comm.detached != action2->comm.detached)
+	       return 1;
+	     if(action1->comm.rate != action2->comm.rate)
+	       return 1;
+	     if(action1->comm.task_size != action2->comm.task_size)
+	       return 1;
+	     if(action1->comm.src_buff != action2->comm.src_buff)
+	       return 1;
+	     if(action1->comm.dst_buff != action2->comm.dst_buff)
+	       return 1;
+	     if(action1->comm.src_data != action2->comm.src_data)
+	       return 1;
+	     if(action1->comm.dst_data != action2->comm.dst_data)
+	       return 1;
+	     
+	     break;
+	   case 3: /* sleep */
+	     if(strcmp(action1->sleep.host->name, action2->sleep.host->name) != 0)
+	       return 1;
+	     break;
+	   case 4: /* synchro */
+	     
+	     break;
+	   default:
+	     break;
+	   }
+
+	   item1 = xbt_fifo_get_next_item(item1);	
+	   item2 = xbt_fifo_get_next_item(item2);
+	   i++;
+	 }
+       }
+     }
+   }
+
+   return 0;
+   
+}
+
+void set_pair_reached(xbt_state_t st){
+
+ 
+  MC_SET_RAW_MEM;
+  
+  mc_pair_reached_t pair = NULL;
+  pair = xbt_new0(s_mc_pair_reached_t, 1);
+  pair->nb = xbt_dynar_length(reached_pairs) + 1;
+  pair->automaton_state = st;
+  pair->prop_ato = xbt_dynar_new(sizeof(int), NULL);
+  pair->system_state = xbt_new0(s_mc_snapshot_t, 1);
+  //pair->rdv_points = xbt_dict_new();  
+  MC_take_snapshot_liveness(pair->system_state);
+
+  /* Get values of propositional symbols */
+  unsigned int cursor = 0;
+  xbt_propositional_symbol_t ps = NULL;
+  int res;
+  int_f_void_t f;
+
+  xbt_dynar_foreach(automaton->propositional_symbols, cursor, ps){
+    f = (int_f_void_t)ps->function;
+    res = (*f)();
+    xbt_dynar_push_as(pair->prop_ato, int, res);
+  }
 
-  return (errors>0);
+  /*xbt_dict_t rdv_points = SIMIX_get_rdv_points();
+
+  xbt_dict_cursor_t cursor_dict = NULL;
+  char *key;
+  char *data;
+  xbt_fifo_item_t item;
+  smx_action_t action;
+
+  xbt_dict_foreach(rdv_points, cursor_dict, key, data){
+    smx_rdv_t new_rdv = xbt_new0(s_smx_rvpoint_t, 1);
+    new_rdv->name = strdup(((smx_rdv_t)data)->name);
+    new_rdv->comm_fifo = xbt_fifo_new();
+    xbt_fifo_foreach(((smx_rdv_t)data)->comm_fifo, item, action, smx_action_t) {
+      smx_action_t a = xbt_new0(s_smx_action_t, 1);
+      memcpy(a, action, sizeof(s_smx_action_t));
+      xbt_fifo_push(new_rdv->comm_fifo, a);
+      XBT_INFO("New action (type = %d, state = %d) in mailbox \"%s\"", action->type, action->state, key);
+      if(action->type==2)
+	XBT_INFO("Type of communication : %d, Ref count = %d", action->comm.type, action->comm.refcount);
+    }
+    //new_rdv->comm_fifo = xbt_fifo_copy(((smx_rdv_t)data)->comm_fifo);
+    xbt_dict_set(pair->rdv_points, new_rdv->name, new_rdv, NULL);
+    }*/
+ 
+  xbt_dynar_push(reached_pairs, &pair); 
 
+  MC_UNSET_RAW_MEM;
+  
 }
 
-int reached(xbt_automaton_t a, xbt_state_t st, mc_snapshot_t s){
+
+int reached_hash(xbt_state_t st){
 
 
-  if(xbt_fifo_size(reached_pairs) == 0){
+  if(xbt_dynar_is_empty(reached_pairs_hash)){
 
     return 0;
 
   }else{
 
     MC_SET_RAW_MEM;
-    
-    xbt_dynar_t prop_ato = xbt_dynar_new(sizeof(int), NULL);
+
+    mc_snapshot_t sn = xbt_new0(s_mc_snapshot_t, 1);
+    MC_take_snapshot_liveness(sn);
+
+    int j;
+    unsigned int hash_regions[sn->num_reg];
+    for(j=0; j<sn->num_reg; j++){
+      hash_regions[j] = hash_region(sn->regions[j]->data, sn->regions[j]->size);
+    }
+
 
     /* Get values of propositional symbols */
+    xbt_dynar_t prop_ato = xbt_dynar_new(sizeof(int), NULL);
     unsigned int cursor = 0;
     xbt_propositional_symbol_t ps = NULL;
-    xbt_dynar_foreach(a->propositional_symbols, cursor, ps){
-      int (*f)() = ps->function;
-      int res = (*f)();
+    int res;
+    int_f_void_t f;
+
+    xbt_dynar_foreach(automaton->propositional_symbols, cursor, ps){
+      f = (int_f_void_t)ps->function;
+      res = (*f)();
       xbt_dynar_push_as(prop_ato, int, res);
     }
 
+    mc_pair_reached_hash_t pair_test = NULL;
 
+    int region_diff = 0;
 
-    int i=0;
-    xbt_fifo_item_t item = xbt_fifo_get_first_item(reached_pairs);
-    mc_pair_reached_t pair_test = NULL;
+    cursor = 0;
 
-    while(i < xbt_fifo_size(reached_pairs)){
+    xbt_dynar_foreach(reached_pairs_hash, cursor, pair_test){
 
-      pair_test = (mc_pair_reached_t) xbt_fifo_get_item_content(item);
-      
       if(automaton_state_compare(pair_test->automaton_state, st) == 0){
 	if(propositional_symbols_compare_value(pair_test->prop_ato, prop_ato) == 0){
-	  if(snapshot_compare(s, pair_test->system_state) == 0){
+	  for(j=0 ; j< sn->num_reg ; j++){
+	    if(hash_regions[j] != pair_test->hash_regions[j]){
+	      region_diff++;
+	    }
+	  }
+	  if(region_diff == 0){
+	    MC_free_snapshot(sn);
+	    xbt_dynar_reset(prop_ato);
+	    xbt_free(prop_ato);
 	    MC_UNSET_RAW_MEM;
 	    return 1;
+	  }else{
+	    XBT_INFO("Different snapshot");
 	  }
+	}else{
+	  XBT_INFO("Different values of propositional symbols");
 	}
+      }else{
+	XBT_INFO("Different automaton state");
       }
 
-      item = xbt_fifo_get_next_item(item);
-      
-      i++;
+      region_diff = 0;
+    }
+    
+    MC_free_snapshot(sn);
+    xbt_dynar_reset(prop_ato);
+    xbt_free(prop_ato);
+    MC_UNSET_RAW_MEM;
+    return 0;
+    
+  }
+}
 
+void set_pair_reached_hash(xbt_state_t st){
+ 
+  MC_SET_RAW_MEM;
+
+  mc_snapshot_t sn = xbt_new0(s_mc_snapshot_t, 1);
+  MC_take_snapshot_liveness(sn);
+ 
+  mc_pair_reached_hash_t pair = NULL;
+  pair = xbt_new0(s_mc_pair_reached_hash_t, 1);
+  pair->automaton_state = st;
+  pair->prop_ato = xbt_dynar_new(sizeof(int), NULL);
+  pair->hash_regions = malloc(sizeof(unsigned int) * sn->num_reg);
+  
+  int i;
+
+  for(i=0 ; i< sn->num_reg ; i++){
+    pair->hash_regions[i] = hash_region(sn->regions[i]->data, sn->regions[i]->size);
+  }
+  
+  /* Get values of propositional symbols */
+  unsigned int cursor = 0;
+  xbt_propositional_symbol_t ps = NULL;
+  int res;
+  int_f_void_t f;
+
+  xbt_dynar_foreach(automaton->propositional_symbols, cursor, ps){
+    f = (int_f_void_t)ps->function;
+    res = (*f)();
+    xbt_dynar_push_as(pair->prop_ato, int, res);
+  }
+  
+  xbt_dynar_push(reached_pairs_hash, &pair);
+
+  MC_free_snapshot(sn);
+  
+  MC_UNSET_RAW_MEM;
+    
+}
+
+
+int visited(xbt_state_t st, int sc){
+
+
+  if(xbt_dynar_is_empty(visited_pairs)){
+
+    return 0;
+
+  }else{
+
+    MC_SET_RAW_MEM;
+
+    mc_snapshot_t sn = xbt_new0(s_mc_snapshot_t, 1);
+    MC_take_snapshot_liveness(sn);
+
+    xbt_dynar_t prop_ato = xbt_dynar_new(sizeof(int), NULL);
+
+    /* Get values of propositional symbols */
+    unsigned int cursor = 0;
+    xbt_propositional_symbol_t ps = NULL;
+    int res;
+    int_f_void_t f;
+
+    xbt_dynar_foreach(automaton->propositional_symbols, cursor, ps){
+      f = (int_f_void_t)ps->function;
+      res = (*f)();
+      xbt_dynar_push_as(prop_ato, int, res);
+    }
+
+    cursor = 0;
+    mc_pair_visited_t pair_test = NULL;
+
+    xbt_dynar_foreach(visited_pairs, cursor, pair_test){
+      if(pair_test->search_cycle == sc) {
+	if(automaton_state_compare(pair_test->automaton_state, st) == 0){
+	  if(propositional_symbols_compare_value(pair_test->prop_ato, prop_ato) == 0){
+	    if(snapshot_compare(pair_test->system_state, sn, std_heap, raw_heap) == 0){
+	    
+	      MC_free_snapshot(sn);
+	      xbt_dynar_reset(prop_ato);
+	      xbt_free(prop_ato);
+	      MC_UNSET_RAW_MEM;
+		
+	      return 1;
+	
+	    }else{
+	      XBT_INFO("Different snapshot");
+	    }
+	  }else{
+	    XBT_INFO("Different values of propositional symbols"); 
+	  }
+	}else{
+	  XBT_INFO("Different automaton state");
+	}
+      }else{
+	XBT_INFO("Different value of search_cycle");
+      }
     }
 
+
+    MC_free_snapshot(sn);
+    xbt_dynar_reset(prop_ato);
+    xbt_free(prop_ato);
     MC_UNSET_RAW_MEM;
     return 0;
     
   }
 }
 
-void set_pair_reached(xbt_automaton_t a, xbt_state_t st, mc_snapshot_t sn){
 
+int visited_hash(xbt_state_t st, int sc){
+
+
+  if(xbt_dynar_is_empty(visited_pairs_hash)){
+
+    return 0;
+
+  }else{
+
+    MC_SET_RAW_MEM;
+
+    mc_snapshot_t sn = xbt_new0(s_mc_snapshot_t, 1);
+    MC_take_snapshot_liveness(sn);
+
+    int j;
+    unsigned int hash_regions[sn->num_reg];
+    for(j=0; j<sn->num_reg; j++){
+      hash_regions[j] = hash_region(sn->regions[j]->data, sn->regions[j]->size);
+    }
+
+    
+    /* Get values of propositional symbols */
+    xbt_dynar_t prop_ato = xbt_dynar_new(sizeof(int), NULL);
+    unsigned int cursor = 0;
+    xbt_propositional_symbol_t ps = NULL;
+    int res;
+    int_f_void_t f;
+
+    xbt_dynar_foreach(automaton->propositional_symbols, cursor, ps){
+      f = (int_f_void_t)ps->function;
+      res = (*f)();
+      xbt_dynar_push_as(prop_ato, int, res);
+    }
+
+    mc_pair_visited_hash_t pair_test = NULL;
+
+    int region_diff = 0;
+    cursor = 0;
+
+    xbt_dynar_foreach(visited_pairs_hash, cursor, pair_test){
+  
+      if(pair_test->search_cycle == sc) {
+	if(automaton_state_compare(pair_test->automaton_state, st) == 0){
+	  if(propositional_symbols_compare_value(pair_test->prop_ato, prop_ato) == 0){
+	    for(j=0 ; j< sn->num_reg ; j++){
+	      if(hash_regions[j] != pair_test->hash_regions[j]){
+		region_diff++;
+	      }
+	    }
+	    if(region_diff == 0){
+	      MC_free_snapshot(sn);
+	      xbt_dynar_reset(prop_ato);
+	      xbt_free(prop_ato);
+	      MC_UNSET_RAW_MEM;
+	      return 1;
+	    }else{
+	      //XBT_INFO("Different snapshot");
+	    }
+	  }else{
+	    //XBT_INFO("Different values of propositional symbols"); 
+	  }
+	}else{
+	  //XBT_INFO("Different automaton state");
+	}
+      }else{
+	//XBT_INFO("Different value of search_cycle");
+      }
+      
+      region_diff = 0;
+    }
+    
+    MC_free_snapshot(sn);
+    xbt_dynar_reset(prop_ato);
+    xbt_free(prop_ato);
+    MC_UNSET_RAW_MEM;
+    return 0;
+    
+  }
+}
+
+void set_pair_visited_hash(xbt_state_t st, int sc){
  
   MC_SET_RAW_MEM;
+
+  mc_snapshot_t sn = xbt_new0(s_mc_snapshot_t, 1);
+  MC_take_snapshot_liveness(sn);
+ 
+  mc_pair_visited_hash_t pair = NULL;
+  pair = xbt_new0(s_mc_pair_visited_hash_t, 1);
+  pair->automaton_state = st;
+  pair->prop_ato = xbt_dynar_new(sizeof(int), NULL);
+  pair->search_cycle = sc;
+  pair->hash_regions = malloc(sizeof(unsigned int) * sn->num_reg);
   
-  mc_pair_reached_t pair = NULL;
-  pair = xbt_new0(s_mc_pair_reached_t, 1);
+  int i;
+
+  for(i=0 ; i< sn->num_reg ; i++){
+    pair->hash_regions[i] = hash_region(sn->regions[i]->data, sn->regions[i]->size);
+  }
+  
+  /* Get values of propositional symbols */
+  unsigned int cursor = 0;
+  xbt_propositional_symbol_t ps = NULL;
+  int res;
+  int_f_void_t f;
+
+  xbt_dynar_foreach(automaton->propositional_symbols, cursor, ps){
+    f = (int_f_void_t)ps->function;
+    res = (*f)();
+    xbt_dynar_push_as(pair->prop_ato, int, res);
+  }
+  
+  xbt_dynar_push(visited_pairs_hash, &pair);
+
+  MC_free_snapshot(sn);
+  
+  MC_UNSET_RAW_MEM;
+    
+}
+
+void set_pair_visited(xbt_state_t st, int sc){
+
+ 
+  MC_SET_RAW_MEM;
+ 
+  mc_pair_visited_t pair = NULL;
+  pair = xbt_new0(s_mc_pair_visited_t, 1);
   pair->automaton_state = st;
   pair->prop_ato = xbt_dynar_new(sizeof(int), NULL);
-  pair->system_state = sn;
+  pair->search_cycle = sc;
+  pair->system_state = xbt_new0(s_mc_snapshot_t, 1);
+  MC_take_snapshot_liveness(pair->system_state);
+
 
   /* Get values of propositional symbols */
   unsigned int cursor = 0;
   xbt_propositional_symbol_t ps = NULL;
-  xbt_dynar_foreach(a->propositional_symbols, cursor, ps){
-    int (*f)() = ps->function;
-    int res = (*f)();
+  int res;
+  int_f_void_t f;
+
+  xbt_dynar_foreach(automaton->propositional_symbols, cursor, ps){
+    f = (int_f_void_t)ps->function;
+    res = (*f)();
     xbt_dynar_push_as(pair->prop_ato, int, res);
   }
   
-  xbt_fifo_unshift(reached_pairs, pair); 
+  xbt_dynar_push(visited_pairs, &pair);
   
   MC_UNSET_RAW_MEM;
   
@@ -141,47 +837,42 @@ void set_pair_reached(xbt_automaton_t a, xbt_state_t st, mc_snapshot_t sn){
 void MC_pair_delete(mc_pair_t pair){
   xbt_free(pair->graph_state->proc_status);
   xbt_free(pair->graph_state);
-  //xbt_free(pair->automaton_state); -> FIXME : à implémenter
   xbt_free(pair);
 }
 
 
 
-int MC_automaton_evaluate_label(xbt_automaton_t a, xbt_exp_label_t l){
+int MC_automaton_evaluate_label(xbt_exp_label_t l){
   
   switch(l->type){
   case 0 : {
-    int left_res = MC_automaton_evaluate_label(a, l->u.or_and.left_exp);
-    int right_res = MC_automaton_evaluate_label(a, l->u.or_and.right_exp);
+    int left_res = MC_automaton_evaluate_label(l->u.or_and.left_exp);
+    int right_res = MC_automaton_evaluate_label(l->u.or_and.right_exp);
     return (left_res || right_res);
-    break;
   }
   case 1 : {
-    int left_res = MC_automaton_evaluate_label(a, l->u.or_and.left_exp);
-    int right_res = MC_automaton_evaluate_label(a, l->u.or_and.right_exp);
+    int left_res = MC_automaton_evaluate_label(l->u.or_and.left_exp);
+    int right_res = MC_automaton_evaluate_label(l->u.or_and.right_exp);
     return (left_res && right_res);
-    break;
   }
   case 2 : {
-    int res = MC_automaton_evaluate_label(a, l->u.exp_not);
+    int res = MC_automaton_evaluate_label(l->u.exp_not);
     return (!res);
-    break;
   }
   case 3 : { 
     unsigned int cursor = 0;
     xbt_propositional_symbol_t p = NULL;
-    xbt_dynar_foreach(a->propositional_symbols, cursor, p){
+    int_f_void_t f;
+    xbt_dynar_foreach(automaton->propositional_symbols, cursor, p){
       if(strcmp(p->pred, l->u.predicat) == 0){
-	int (*f)() = p->function;
+	f = (int_f_void_t)p->function;
 	return (*f)();
       }
     }
     return -1;
-    break;
   }
   case 4 : {
     return 2;
-    break;
   }
   default : 
     return -1;
@@ -189,15 +880,11 @@ int MC_automaton_evaluate_label(xbt_automaton_t a, xbt_exp_label_t l){
 }
 
 
-
-
-
 /********************* Double-DFS stateless *******************/
 
 void MC_pair_stateless_delete(mc_pair_stateless_t pair){
   xbt_free(pair->graph_state->proc_status);
   xbt_free(pair->graph_state);
-  //xbt_free(pair->automaton_state); -> FIXME : à implémenter
   xbt_free(pair);
 }
 
@@ -211,15 +898,16 @@ mc_pair_stateless_t new_pair_stateless(mc_state_t sg, xbt_state_t st, int r){
   return p;
 }
 
-void MC_ddfs_stateless_init(xbt_automaton_t a, char *prgm){
+void MC_ddfs_init(void){
+
+  XBT_INFO("**************************************************");
+  XBT_INFO("Double-DFS init");
+  XBT_INFO("**************************************************");
 
-  XBT_DEBUG("**************************************************");
-  XBT_DEBUG("Double-DFS stateless init");
-  XBT_DEBUG("**************************************************");
- 
   mc_pair_stateless_t mc_initial_pair = NULL;
   mc_state_t initial_graph_state = NULL;
   smx_process_t process; 
+
  
   MC_wait_for_requests();
 
@@ -232,49 +920,53 @@ void MC_ddfs_stateless_init(xbt_automaton_t a, char *prgm){
     }
   }
 
-  reached_pairs = xbt_fifo_new(); 
+  reached_pairs = xbt_dynar_new(sizeof(mc_pair_reached_t), NULL);
+  //reached_pairs_hash = xbt_dynar_new(sizeof(mc_pair_reached_hash_t), NULL);
+  //visited_pairs = xbt_dynar_new(sizeof(mc_pair_visited_t), NULL);
+  visited_pairs_hash = xbt_dynar_new(sizeof(mc_pair_visited_hash_t), NULL);
   successors = xbt_dynar_new(sizeof(mc_pair_stateless_t), NULL);
-  //snapshot = xbt_new0(s_mc_snapshot_t, 1);
 
-  initial_snapshot = xbt_new0(s_mc_snapshot_t, 1);
-  MC_take_snapshot_liveness(initial_snapshot, prgm);
+  /* Save the initial state */
+  initial_snapshot_liveness = xbt_new0(s_mc_snapshot_t, 1);
+  MC_take_snapshot_liveness(initial_snapshot_liveness);
 
   MC_UNSET_RAW_MEM; 
 
   unsigned int cursor = 0;
   xbt_state_t state;
 
-  xbt_dynar_foreach(a->states, cursor, state){
+  xbt_dynar_foreach(automaton->states, cursor, state){
     if(state->type == -1){
       
       MC_SET_RAW_MEM;
       mc_initial_pair = new_pair_stateless(initial_graph_state, state, MC_state_interleave_size(initial_graph_state));
-      xbt_fifo_unshift(mc_stack_liveness_stateless, mc_initial_pair);
+      xbt_fifo_unshift(mc_stack_liveness, mc_initial_pair);
       MC_UNSET_RAW_MEM;
       
       if(cursor != 0){
-	MC_restore_snapshot(initial_snapshot);
+	MC_restore_snapshot(initial_snapshot_liveness);
 	MC_UNSET_RAW_MEM;
       }
 
-      MC_ddfs_stateless(a, 0, 0, prgm);
+      MC_ddfs(0);
 
     }else{
       if(state->type == 2){
       
 	MC_SET_RAW_MEM;
 	mc_initial_pair = new_pair_stateless(initial_graph_state, state, MC_state_interleave_size(initial_graph_state));
-	xbt_fifo_unshift(mc_stack_liveness_stateless, mc_initial_pair);
+	xbt_fifo_unshift(mc_stack_liveness, mc_initial_pair);
 	MC_UNSET_RAW_MEM;
 
-	set_pair_reached(a, state, initial_snapshot);
-	
+	set_pair_reached(state);
+	//set_pair_reached_hash(state);
+
 	if(cursor != 0){
-	  MC_restore_snapshot(initial_snapshot);
+	  MC_restore_snapshot(initial_snapshot_liveness);
 	  MC_UNSET_RAW_MEM;
 	}
 	
-	MC_ddfs_stateless(a, 1, 0, prgm);
+	MC_ddfs(1);
 	
       }
     }
@@ -283,40 +975,32 @@ void MC_ddfs_stateless_init(xbt_automaton_t a, char *prgm){
 }
 
 
-void MC_ddfs_stateless(xbt_automaton_t a, int search_cycle, int replay, char *prgm){
+void MC_ddfs(int search_cycle){
 
   smx_process_t process;
   mc_pair_stateless_t current_pair = NULL;
-  mc_snapshot_t snapshot = NULL;
 
-  if(xbt_fifo_size(mc_stack_liveness_stateless) == 0)
+  if(xbt_fifo_size(mc_stack_liveness) == 0)
     return;
 
-  if(replay == 1){
-    MC_replay_liveness(mc_stack_liveness_stateless, 0);
-    current_pair = (mc_pair_stateless_t)xbt_fifo_get_item_content(xbt_fifo_get_first_item(mc_stack_liveness_stateless));
-    xbt_swag_foreach(process, simix_global->process_list){
-      if(MC_process_is_enabled(process)){
-	MC_state_interleave_process(current_pair->graph_state, process);
-      }
-    }
-  }
 
   /* Get current pair */
-  current_pair = (mc_pair_stateless_t)xbt_fifo_get_item_content(xbt_fifo_get_first_item(mc_stack_liveness_stateless));
+  current_pair = (mc_pair_stateless_t)xbt_fifo_get_item_content(xbt_fifo_get_first_item(mc_stack_liveness));
 
   /* Update current state in buchi automaton */
-  a->current_state = current_pair->automaton_state;
+  automaton->current_state = current_pair->automaton_state;
 
  
-  XBT_DEBUG("********************* ( Depth = %d, search_cycle = %d )", xbt_fifo_size(mc_stack_liveness_stateless), search_cycle);
-  XBT_DEBUG("Pair : graph=%p, automaton=%p(%s), %u interleave", current_pair->graph_state, current_pair->automaton_state, current_pair->automaton_state->id, MC_state_interleave_size(current_pair->graph_state));
+  XBT_INFO("********************* ( Depth = %d, search_cycle = %d )", xbt_fifo_size(mc_stack_liveness), search_cycle);
+  XBT_INFO("Pair : graph=%p, automaton=%p(%s), %u interleave", current_pair->graph_state, current_pair->automaton_state, current_pair->automaton_state->id, MC_state_interleave_size(current_pair->graph_state));
  
   mc_stats_pair->visited_pairs++;
 
+  //sleep(1);
+
   int value;
   mc_state_t next_graph_state = NULL;
-  smx_req_t req = NULL;
+  smx_simcall_t req = NULL;
   char *req_str;
 
   xbt_transition_t transition_succ;
@@ -325,24 +1009,29 @@ void MC_ddfs_stateless(xbt_automaton_t a, int search_cycle, int replay, char *pr
 
   mc_pair_stateless_t next_pair = NULL;
   mc_pair_stateless_t pair_succ;
+  
+  if(xbt_fifo_size(mc_stack_liveness) < MAX_DEPTH_LIVENESS){
 
-  if(xbt_fifo_size(mc_stack_liveness_stateless) < MAX_DEPTH_LIVENESS){
+    //set_pair_visited(current_pair->automaton_state, search_cycle);
+    set_pair_visited_hash(current_pair->automaton_state, search_cycle);
+
+    //XBT_INFO("Visited pairs : %lu", xbt_dynar_length(visited_pairs));
+    XBT_INFO("Visited pairs : %lu", xbt_dynar_length(visited_pairs_hash));
 
     if(current_pair->requests > 0){
 
       while((req = MC_state_get_request(current_pair->graph_state, &value)) != NULL){
    
 	/* Debug information */
-	if(XBT_LOG_ISENABLED(mc_liveness, xbt_log_priority_debug)){
-	  req_str = MC_request_to_string(req, value);
-	  XBT_DEBUG("Execute: %s", req_str);
-	  xbt_free(req_str);
-	}
+
+	req_str = MC_request_to_string(req, value);
+	XBT_INFO("Execute: %s", req_str);
+	xbt_free(req_str);
 
 	MC_state_set_executed_request(current_pair->graph_state, req, value);   
-    
+
 	/* Answer the request */
-	SIMIX_request_pre(req, value);
+	SIMIX_simcall_pre(req, value);
 
 	/* Wait for requests (schedules processes) */
 	MC_wait_for_requests();
@@ -368,7 +1057,7 @@ void MC_ddfs_stateless(xbt_automaton_t a, int search_cycle, int replay, char *pr
 	cursor= 0;
 	xbt_dynar_foreach(current_pair->automaton_state->out, cursor, transition_succ){
 
-	  res = MC_automaton_evaluate_label(a, transition_succ->label);
+	  res = MC_automaton_evaluate_label(transition_succ->label);
 
 	  if(res == 1){ // enabled transition in automaton
 	    MC_SET_RAW_MEM;
@@ -383,7 +1072,7 @@ void MC_ddfs_stateless(xbt_automaton_t a, int search_cycle, int replay, char *pr
    
 	xbt_dynar_foreach(current_pair->automaton_state->out, cursor, transition_succ){
       
-	  res = MC_automaton_evaluate_label(a, transition_succ->label);
+	  res = MC_automaton_evaluate_label(transition_succ->label);
 	
 	  if(res == 2){ // true transition in automaton
 	    MC_SET_RAW_MEM;
@@ -394,84 +1083,109 @@ void MC_ddfs_stateless(xbt_automaton_t a, int search_cycle, int replay, char *pr
 
 	}
 
-   
-	if(xbt_dynar_length(successors) == 0){
-	  MC_SET_RAW_MEM;
-	  next_pair = new_pair_stateless(next_graph_state, current_pair->automaton_state, MC_state_interleave_size(next_graph_state));
-	  xbt_dynar_push(successors, &next_pair);
-	  MC_UNSET_RAW_MEM;
-	}
-
 	cursor = 0; 
-
+	
 	xbt_dynar_foreach(successors, cursor, pair_succ){
 
 	  if(search_cycle == 1){
 
 	    if((pair_succ->automaton_state->type == 1) || (pair_succ->automaton_state->type == 2)){ 
 		      
-	      MC_SET_RAW_MEM;
-	      snapshot = xbt_new0(s_mc_snapshot_t, 1);
-	      MC_take_snapshot_liveness(snapshot, prgm);
-	      MC_UNSET_RAW_MEM;
-
-	      if(reached(a, pair_succ->automaton_state, snapshot) == 1){
-
-		XBT_DEBUG("Next pair (depth = %d, %d interleave) already reached !", xbt_fifo_size(mc_stack_liveness_stateless) + 1, MC_state_interleave_size(pair_succ->graph_state));
+	      if(reached(pair_succ->automaton_state)){
+		//if(reached_hash(pair_succ->automaton_state)){
+	      
+		XBT_INFO("Next pair (depth = %d, %u interleave) already reached !", xbt_fifo_size(mc_stack_liveness) + 1, MC_state_interleave_size(pair_succ->graph_state));
 
 		XBT_INFO("*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*");
 		XBT_INFO("|             ACCEPTANCE CYCLE            |");
 		XBT_INFO("*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*");
 		XBT_INFO("Counter-example that violates formula :");
-		MC_show_stack_liveness_stateless(mc_stack_liveness_stateless);
-		MC_dump_stack_liveness_stateless(mc_stack_liveness_stateless);
+		MC_show_stack_liveness(mc_stack_liveness);
+		MC_dump_stack_liveness(mc_stack_liveness);
 		MC_print_statistics_pairs(mc_stats_pair);
 		exit(0);
 
 	      }else{
 
-		XBT_DEBUG("Next pair (depth =%d) -> Acceptance pair : graph=%p, automaton=%p(%s)", xbt_fifo_size(mc_stack_liveness_stateless) + 1, pair_succ->graph_state, pair_succ->automaton_state, pair_succ->automaton_state->id);
+		XBT_INFO("Next pair (depth =%d) -> Acceptance pair : graph=%p, automaton=%p(%s)", xbt_fifo_size(mc_stack_liveness) + 1, pair_succ->graph_state, pair_succ->automaton_state, pair_succ->automaton_state->id);
 	      
-		set_pair_reached(a, pair_succ->automaton_state, snapshot); 
+		set_pair_reached(pair_succ->automaton_state);
+		//set_pair_reached_hash(pair_succ->automaton_state);
+
+		XBT_INFO("Reached pairs : %lu", xbt_dynar_length(reached_pairs));
+		//XBT_INFO("Reached pairs : %lu", xbt_dynar_length(reached_pairs_hash));
+
+		MC_SET_RAW_MEM;
+		xbt_fifo_unshift(mc_stack_liveness, pair_succ);
+		MC_UNSET_RAW_MEM;
+		
+		MC_ddfs(search_cycle);
 
 	      }
 
+	    }else{
+
+	      if(!visited_hash(pair_succ->automaton_state, search_cycle)){
+		//if(!visited(pair_succ->automaton_state, search_cycle)){
+		
+		MC_SET_RAW_MEM;
+		xbt_fifo_unshift(mc_stack_liveness, pair_succ);
+		MC_UNSET_RAW_MEM;
+		
+		MC_ddfs(search_cycle);
+		
+	      }else{
+
+		XBT_INFO("Next pair already visited ! ");
+
+	      }
+	      
 	    }
 
 	  }else{
 	  
 	    if(((pair_succ->automaton_state->type == 1) || (pair_succ->automaton_state->type == 2))){
 
-	      XBT_DEBUG("Next pair (depth =%d) -> Acceptance pair : graph=%p, automaton=%p(%s)", xbt_fifo_size(mc_stack_liveness_stateless) + 1, pair_succ->graph_state, pair_succ->automaton_state, pair_succ->automaton_state->id);
+	      XBT_INFO("Next pair (depth =%d) -> Acceptance pair : graph=%p, automaton=%p(%s)", xbt_fifo_size(mc_stack_liveness) + 1, pair_succ->graph_state, pair_succ->automaton_state, pair_succ->automaton_state->id);
+	    
+	      set_pair_reached(pair_succ->automaton_state); 
+	      //set_pair_reached_hash(pair_succ->automaton_state);
 
+	      search_cycle = 1;
+
+	      XBT_INFO("Reached pairs : %lu", xbt_dynar_length(reached_pairs));
+	      //XBT_INFO("Reached pairs : %lu", xbt_dynar_length(reached_pairs_hash));
+
+	    }
+
+	    if(!visited_hash(pair_succ->automaton_state, search_cycle)){
+	      //if(!visited(pair_succ->automaton_state, search_cycle)){
+	      
 	      MC_SET_RAW_MEM;
-	      snapshot = xbt_new0(s_mc_snapshot_t, 1);
-	      MC_take_snapshot_liveness(snapshot, prgm);
+	      xbt_fifo_unshift(mc_stack_liveness, pair_succ);
 	      MC_UNSET_RAW_MEM;
-	    
-	      set_pair_reached(a, pair_succ->automaton_state, snapshot); 
 	      
-	      search_cycle = 1;
+	      MC_ddfs(search_cycle);
+	      
+	    }else{
+
+	      XBT_INFO("Next pair already visited ! ");
 
 	    }
 
 	  }
 
-	  MC_SET_RAW_MEM;
-	  xbt_fifo_unshift(mc_stack_liveness_stateless, pair_succ);
-	  MC_UNSET_RAW_MEM;
-
-	  MC_ddfs_stateless(a, search_cycle, 0, prgm);
-
+	 
 	  /* Restore system before checking others successors */
 	  if(cursor != (xbt_dynar_length(successors) - 1))
-	    MC_replay_liveness(mc_stack_liveness_stateless, 1);
+	    MC_replay_liveness(mc_stack_liveness, 1);
 	
+	  
 	}
 
 	if(MC_state_interleave_size(current_pair->graph_state) > 0){
-	  XBT_DEBUG("Backtracking to depth %u", xbt_fifo_size(mc_stack_liveness_stateless));
-	  MC_replay_liveness(mc_stack_liveness_stateless, 0);
+	  XBT_INFO("Backtracking to depth %d", xbt_fifo_size(mc_stack_liveness));
+	  MC_replay_liveness(mc_stack_liveness, 0);
 	}
       }
 
@@ -491,7 +1205,7 @@ void MC_ddfs_stateless(xbt_automaton_t a, int search_cycle, int replay, char *pr
       cursor= 0;
       xbt_dynar_foreach(current_pair->automaton_state->out, cursor, transition_succ){
 
-	res = MC_automaton_evaluate_label(a, transition_succ->label);
+	res = MC_automaton_evaluate_label(transition_succ->label);
 
 	if(res == 1){ // enabled transition in automaton
 	  MC_SET_RAW_MEM;
@@ -506,7 +1220,7 @@ void MC_ddfs_stateless(xbt_automaton_t a, int search_cycle, int replay, char *pr
    
       xbt_dynar_foreach(current_pair->automaton_state->out, cursor, transition_succ){
       
-	res = MC_automaton_evaluate_label(a, transition_succ->label);
+	res = MC_automaton_evaluate_label(transition_succ->label);
 	
 	if(res == 2){ // true transition in automaton
 	  MC_SET_RAW_MEM;
@@ -517,101 +1231,126 @@ void MC_ddfs_stateless(xbt_automaton_t a, int search_cycle, int replay, char *pr
 
       }
 
-   
-      if(xbt_dynar_length(successors) == 0){
-	MC_SET_RAW_MEM;
-	next_pair = new_pair_stateless(next_graph_state, current_pair->automaton_state, MC_state_interleave_size(next_graph_state));
-	xbt_dynar_push(successors, &next_pair);
-	MC_UNSET_RAW_MEM;
-      }
-
       cursor = 0; 
-
+     
       xbt_dynar_foreach(successors, cursor, pair_succ){
 
 	if(search_cycle == 1){
 
 	  if((pair_succ->automaton_state->type == 1) || (pair_succ->automaton_state->type == 2)){ 
 
-	    MC_SET_RAW_MEM;
-	    snapshot = xbt_new0(s_mc_snapshot_t, 1);
-	    MC_take_snapshot_liveness(snapshot, prgm);
-	    MC_UNSET_RAW_MEM;
-	
-	    if(reached(a, pair_succ->automaton_state, snapshot) == 1){
-
-	      XBT_DEBUG("Next pair (depth = %d) already reached !", xbt_fifo_size(mc_stack_liveness_stateless) + 1);
+	    if(reached(pair_succ->automaton_state)){
+	      //if(reached_hash(pair_succ->automaton_state)){
 
+	      XBT_INFO("Next pair (depth = %d) already reached !", xbt_fifo_size(mc_stack_liveness) + 1);
+	      
 	      XBT_INFO("*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*");
 	      XBT_INFO("|             ACCEPTANCE CYCLE            |");
 	      XBT_INFO("*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*");
 	      XBT_INFO("Counter-example that violates formula :");
-	      MC_show_stack_liveness_stateless(mc_stack_liveness_stateless);
-	      MC_dump_stack_liveness_stateless(mc_stack_liveness_stateless);
+	      MC_show_stack_liveness(mc_stack_liveness);
+	      MC_dump_stack_liveness(mc_stack_liveness);
 	      MC_print_statistics_pairs(mc_stats_pair);
 	      exit(0);
 
 	    }else{
 
-	      XBT_DEBUG("Next pair (depth =%d) -> Acceptance pair : graph=%p, automaton=%p(%s)", xbt_fifo_size(mc_stack_liveness_stateless) + 1, pair_succ->graph_state, pair_succ->automaton_state, pair_succ->automaton_state->id);
+	      XBT_INFO("Next pair (depth = %d) -> Acceptance pair : graph=%p, automaton=%p(%s)", xbt_fifo_size(mc_stack_liveness) + 1, pair_succ->graph_state, pair_succ->automaton_state, pair_succ->automaton_state->id);
+	      
+	      set_pair_reached(pair_succ->automaton_state);
+	      //set_pair_reached_hash(pair_succ->automaton_state);
+		
+	      XBT_INFO("Reached pairs : %lu", xbt_dynar_length(reached_pairs));
+	      //XBT_INFO("Reached pairs : %lu", xbt_dynar_length(reached_pairs_hash));
+
+	      MC_SET_RAW_MEM;
+	      xbt_fifo_unshift(mc_stack_liveness, pair_succ);
+	      MC_UNSET_RAW_MEM;
 	      
-	      set_pair_reached(a, pair_succ->automaton_state, snapshot); 
+	      MC_ddfs(search_cycle);
 
 	    }
 
+	  }else{
+
+	    if(!visited_hash(pair_succ->automaton_state, search_cycle)){
+	      //if(!visited(pair_succ->automaton_state, search_cycle)){
+
+	      MC_SET_RAW_MEM;
+	      xbt_fifo_unshift(mc_stack_liveness, pair_succ);
+	      MC_UNSET_RAW_MEM;
+	      
+	      MC_ddfs(search_cycle);
+	      
+	    }else{
+
+	      XBT_INFO("Next pair already visited ! ");
+
+	    }
 	  }
+	    
 
 	}else{
-	  
-	  if(((pair_succ->automaton_state->type == 1) || (pair_succ->automaton_state->type == 2)) && (xbt_fifo_size(mc_stack_liveness_stateless) < (MAX_DEPTH_LIVENESS - 1))){
-
-	    MC_SET_RAW_MEM;
-	    snapshot = xbt_new0(s_mc_snapshot_t, 1);
-	    MC_take_snapshot_liveness(snapshot, prgm);
-	    MC_UNSET_RAW_MEM;
 	    
-	    set_pair_reached(a, pair_succ->automaton_state, snapshot); 
+	  if(((pair_succ->automaton_state->type == 1) || (pair_succ->automaton_state->type == 2))){
+
+	    set_pair_reached(pair_succ->automaton_state);
+	    //set_pair_reached_hash(pair_succ->automaton_state);
 	    	    
 	    search_cycle = 1;
 
+	    XBT_INFO("Reached pairs : %lu", xbt_dynar_length(reached_pairs));
+	    //XBT_INFO("Reached pairs : %lu", xbt_dynar_length(reached_pairs_hash));
+
 	  }
 
-	}
+	  if(!visited_hash(pair_succ->automaton_state, search_cycle)){
+	    //if(!visited(pair_succ->automaton_state, search_cycle)){
 
-	MC_SET_RAW_MEM;
-	xbt_fifo_unshift(mc_stack_liveness_stateless, pair_succ);
-	MC_UNSET_RAW_MEM;
+	    MC_SET_RAW_MEM;
+	    xbt_fifo_unshift(mc_stack_liveness, pair_succ);
+	    MC_UNSET_RAW_MEM;
+	    
+	    MC_ddfs(search_cycle);
+	    
+	  }else{
+
+	    XBT_INFO("Next pair already visited ! ");
+
+	  }
 
-	MC_ddfs_stateless(a, search_cycle, 0, prgm);
+	}
 
 	/* Restore system before checking others successors */
 	if(cursor != xbt_dynar_length(successors) - 1)
-	  MC_replay_liveness(mc_stack_liveness_stateless, 1);
+	  MC_replay_liveness(mc_stack_liveness, 1);
 
+	 
       }
-     
+           
     }
+    
+  }else{
+    
+    XBT_INFO("Max depth reached");
+
   }
 
-  if(xbt_fifo_size(mc_stack_liveness_stateless) == MAX_DEPTH_LIVENESS ){
-    XBT_DEBUG("Pair (graph=%p, automaton =%p, search_cycle = %u) shifted in stack, maximum depth reached", current_pair->graph_state, current_pair->automaton_state, search_cycle);
+  if(xbt_fifo_size(mc_stack_liveness) == MAX_DEPTH_LIVENESS ){
+    XBT_INFO("Pair (graph=%p, automaton =%p, search_cycle = %d, depth = %d) shifted in stack, maximum depth reached", current_pair->graph_state, current_pair->automaton_state, search_cycle, xbt_fifo_size(mc_stack_liveness) );
   }else{
-    XBT_DEBUG("Pair (graph=%p, automaton =%p, search_cycle = %u) shifted in stack", current_pair->graph_state, current_pair->automaton_state, search_cycle);
+    XBT_INFO("Pair (graph=%p, automaton =%p, search_cycle = %d, depth = %d) shifted in stack", current_pair->graph_state, current_pair->automaton_state, search_cycle, xbt_fifo_size(mc_stack_liveness) );
   }
 
   
   MC_SET_RAW_MEM;
-  xbt_fifo_shift(mc_stack_liveness_stateless);
+  xbt_fifo_shift(mc_stack_liveness);
   if((current_pair->automaton_state->type == 1) || (current_pair->automaton_state->type == 2)){
-    xbt_fifo_shift(reached_pairs);
+    xbt_dynar_pop(reached_pairs, NULL);
+    //xbt_dynar_pop(reached_pairs_hash, NULL);
   }
-  if(snapshot != NULL)
-    MC_free_snapshot(snapshot);
   MC_UNSET_RAW_MEM;
-
-  MC_pair_stateless_delete(current_pair);
-
-  /* FIXME : free memory (pair, snapshot)*/
+  
+  
 
 }
-