X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/9b8c19c2b3028ebeef9f76f159af56acd5739c6d..3f3d8226150530c1653f25c8c7834aa82b4b2e33:/src/mc/mc_compare.c

diff --git a/src/mc/mc_compare.c b/src/mc/mc_compare.c
index 5d8ac72471..8d71ad4449 100644
--- a/src/mc/mc_compare.c
+++ b/src/mc/mc_compare.c
@@ -1,4 +1,5 @@
-/* Copyright (c) 2012-2013 Da SimGrid Team. All rights reserved.            */
+/* Copyright (c) 2012-2013. The 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. */
@@ -15,16 +16,32 @@ typedef struct s_pointers_pair{
   void *p2;
 }s_pointers_pair_t, *pointers_pair_t;
 
-xbt_dynar_t compared_pointers;
+__thread xbt_dynar_t compared_pointers;
 
-static int heap_region_compare(void *d1, void *d2, size_t size);
+/************************** Free functions ****************************/
+/********************************************************************/
 
-static void stack_region_free(stack_region_t s);
+static void stack_region_free(stack_region_t s){
+  if(s){
+    xbt_free(s->process_name);
+    xbt_free(s);
+  }
+}
+
+static void stack_region_free_voidp(void *s){
+  stack_region_free((stack_region_t) * (void **) s);
+}
 
-static int compare_local_variables(mc_snapshot_stack_t stack1, mc_snapshot_stack_t stack2, void *heap1, void *heap2);
-static int compare_global_variables(int region_type, mc_mem_region_t r1, mc_mem_region_t r2);
-static int compare_pointer(char *pointer_type, void *addr_pointed1, void *addr_pointed2, int region_size, int region_type);
-static int compare_areas_with_type(void *area1, void *area2, xbt_dict_t types, xbt_dict_t other_types, char *type_id, int region_size, int region_type, void *start_data, int pointer_level);
+static void pointers_pair_free(pointers_pair_t p){
+  xbt_free(p);
+}
+
+static void pointers_pair_free_voidp(void *p){
+  pointers_pair_free((pointers_pair_t) * (void **)p);
+}
+
+/************************** Snapshot comparison *******************************/
+/******************************************************************************/
 
 static int already_compared_pointers(void *p1, void *p2){
 
@@ -77,9 +94,10 @@ static void add_compared_pointers(void *p1, void *p2){
     cursor = (start + end) / 2;
     pair = (pointers_pair_t)xbt_dynar_get_as(compared_pointers, cursor, pointers_pair_t);
     if(pair->p1 == p1){
-      if(pair->p2 == p2)
+      if(pair->p2 == p2){
+        pointers_pair_free(new_pair);
         return;
-      else if(pair->p2 < p2)
+      }else if(pair->p2 < p2)
         start = cursor + 1;
       else
         end = cursor - 1;
@@ -111,65 +129,63 @@ static int compare_areas_with_type(void *area1, void *area2, xbt_dict_t types, x
   dw_type_t member, subtype, subsubtype;
   int elm_size, i, res, switch_types = 0;
   void *addr_pointed1, *addr_pointed2;
-  int pointed_area_size1, pointed_area_size2;
 
   switch(type->type){
-  case e_dw_base_type:
-  case e_dw_enumeration_type:
-  case e_dw_union_type:
-    return (memcmp(area1, area2, type->size) != 0);
+  case DW_TAG_base_type:
+  case DW_TAG_enumeration_type:
+  case DW_TAG_union_type:
+    return (memcmp(area1, area2, type->byte_size) != 0);
     break;
-  case e_dw_typedef:
-  case e_dw_volatile_type:
+  case DW_TAG_typedef:
+  case DW_TAG_volatile_type:
+  case DW_TAG_const_type:
     return compare_areas_with_type(area1, area2, types, other_types, type->dw_type_id, region_size, region_type, start_data, pointer_level);
     break;
-  case e_dw_const_type: /* Const variable cannot be modified */
-    return -1;
-    break;
-  case e_dw_array_type:
+  case DW_TAG_array_type:
     subtype = xbt_dict_get_or_null(types, type->dw_type_id);
     switch(subtype->type){
-    case e_dw_base_type:
-    case e_dw_enumeration_type:
-    case e_dw_pointer_type:
-    case e_dw_structure_type:
-    case e_dw_union_type:
-      if(subtype->size == 0){ /*declaration of the type, need the complete description */
+    case DW_TAG_base_type:
+    case DW_TAG_enumeration_type:
+    case DW_TAG_pointer_type:
+    case DW_TAG_structure_type:
+    case DW_TAG_union_type:
+      if(subtype->byte_size == 0){ /*declaration of the type, need the complete description */
         subtype = xbt_dict_get_or_null(types, get_type_description(types, subtype->name));
         if(subtype == NULL){
           subtype = xbt_dict_get_or_null(other_types, get_type_description(other_types, subtype->name));
           switch_types = 1;
         }
       }
-      elm_size = subtype->size;
+      elm_size = subtype->byte_size;
       break;
-    case e_dw_typedef:
-    case e_dw_volatile_type:
+    case DW_TAG_const_type:
+    case DW_TAG_typedef:
+    case DW_TAG_volatile_type:
       subsubtype = xbt_dict_get_or_null(types, subtype->dw_type_id);
-      if(subsubtype->size == 0){ /*declaration of the type, need the complete description */
+      if(subsubtype->byte_size == 0){ /*declaration of the type, need the complete description */
         subsubtype = xbt_dict_get_or_null(types, get_type_description(types, subsubtype->name));
         if(subsubtype == NULL){
           subsubtype = xbt_dict_get_or_null(other_types, get_type_description(other_types, subsubtype->name));
           switch_types = 1;
         }
       }
-      elm_size = subsubtype->size;
+      elm_size = subsubtype->byte_size;
       break;
     default : 
       return 0;
       break;
     }
-    for(i=0; i<type->size; i++){
+    for(i=0; i<type->element_count; i++){
       if(switch_types)
         res = compare_areas_with_type((char *)area1 + (i*elm_size), (char *)area2 + (i*elm_size), other_types, types, type->dw_type_id, region_size, region_type, start_data, pointer_level);
       else
         res = compare_areas_with_type((char *)area1 + (i*elm_size), (char *)area2 + (i*elm_size), types, other_types, type->dw_type_id, region_size, region_type, start_data, pointer_level);
-      if(res != 0)
+      if(res == 1)
         return res;
     }
     break;
-  case e_dw_pointer_type: 
-    if(type->dw_type_id && ((dw_type_t)xbt_dict_get_or_null(types, type->dw_type_id))->type == e_dw_subroutine_type){
+  case DW_TAG_pointer_type:
+    if(type->dw_type_id && ((dw_type_t)xbt_dict_get_or_null(types, type->dw_type_id))->type == DW_TAG_subroutine_type){
       addr_pointed1 = *((void **)(area1)); 
       addr_pointed2 = *((void **)(area2));
       return (addr_pointed1 != addr_pointed2);
@@ -177,8 +193,6 @@ static int compare_areas_with_type(void *area1, void *area2, xbt_dict_t types, x
       addr_pointed1 = *((void **)(area1)); 
       addr_pointed2 = *((void **)(area2));
       
-      if((addr_pointed1 == addr_pointed2) && ((pointed_area_size1 = get_pointed_area_size(addr_pointed1, 1)) != (pointed_area_size2 = get_pointed_area_size(addr_pointed2, 2))))
-        return -1;
       if(addr_pointed1 == NULL && addr_pointed2 == NULL)
         return 0;
       if(already_compared_pointers(addr_pointed1, addr_pointed2) != -1)
@@ -187,26 +201,41 @@ static int compare_areas_with_type(void *area1, void *area2, xbt_dict_t types, x
 
       pointer_level++;
       
-      if(addr_pointed1 > std_heap && (char *)addr_pointed1 < (char*) std_heap + STD_HEAP_SIZE && addr_pointed2 > std_heap && (char *)addr_pointed2 < (char*) std_heap + STD_HEAP_SIZE){
+      // Some cases are not handled here:
+      // * the pointers lead to different areas (one to the heap, the other to the RW segment ...);
+      // * a pointer leads to the read-only segment of the current object;
+      // * a pointer lead to a different ELF object.
+
+      // The pointers are both in the heap:
+      if(addr_pointed1 > std_heap && (char *)addr_pointed1 < (char*) std_heap + STD_HEAP_SIZE){
+        if(!(addr_pointed2 > std_heap && (char *)addr_pointed2 < (char*) std_heap + STD_HEAP_SIZE))
+          return 1;
         return compare_heap_area(addr_pointed1, addr_pointed2, NULL, types, other_types, type->dw_type_id, pointer_level); 
-      }else if(addr_pointed1 > start_data && (char*)addr_pointed1 <= (char *)start_data + region_size && addr_pointed2 > start_data && (char*)addr_pointed2 <= (char *)start_data + region_size){
+      }
+
+      // The pointers are both in the current object R/W segment:
+      else if(addr_pointed1 > start_data && (char*)addr_pointed1 <= (char *)start_data + region_size){
+        if(!(addr_pointed2 > start_data && (char*)addr_pointed2 <= (char *)start_data + region_size))
+          return 1;
         if(type->dw_type_id == NULL)
           return  (addr_pointed1 != addr_pointed2);
         else
-          return compare_areas_with_type(addr_pointed1, addr_pointed2, types, other_types, type->dw_type_id, region_size, region_type, start_data, pointer_level); 
-      }else{
-        return  (addr_pointed1 != addr_pointed2);
+          return  compare_areas_with_type(addr_pointed1, addr_pointed2, types, other_types, type->dw_type_id, region_size, region_type, start_data, pointer_level); 
+      }
+
+      else{
+        return (addr_pointed1 != addr_pointed2);
       }
     }
     break;
-  case e_dw_structure_type:
+  case DW_TAG_structure_type:
     xbt_dynar_foreach(type->members, cursor, member){
       res = compare_areas_with_type((char *)area1 + member->offset, (char *)area2 + member->offset, types, other_types, member->dw_type_id, region_size, region_type, start_data, pointer_level);
       if(res == 1)
         return res;
     }
     break;
-  case e_dw_subroutine_type:
+  case DW_TAG_subroutine_type:
     return -1;
     break;
   default:
@@ -220,8 +249,8 @@ static int compare_areas_with_type(void *area1, void *area2, xbt_dict_t types, x
 static int compare_global_variables(int region_type, mc_mem_region_t r1, mc_mem_region_t r2){
 
   if(!compared_pointers){
-    compared_pointers = xbt_dynar_new(sizeof(pointers_pair_t), NULL);
-    MC_ignore_global_variable("compared_pointers", 1);
+    compared_pointers = xbt_dynar_new(sizeof(pointers_pair_t), pointers_pair_free_voidp);
+    MC_ignore_global_variable("compared_pointers");
   }else{
     xbt_dynar_reset(compared_pointers);
   }
@@ -233,50 +262,67 @@ static int compare_global_variables(int region_type, mc_mem_region_t r1, mc_mem_
   dw_variable_t current_var;
   size_t offset;
   void *start_data;
+  void* start_data_binary = mc_binary_info->start_rw;
+  void* start_data_libsimgrid = mc_libsimgrid_info->start_rw;
 
+  mc_object_info_t object_info = NULL;
+  mc_object_info_t other_object_info = NULL;
   if(region_type == 2){
-    variables = mc_global_variables_binary;
-    types = mc_variables_type_binary;
-    other_types = mc_variables_type_libsimgrid;
+    object_info = mc_binary_info;
+    other_object_info = mc_libsimgrid_info;
     start_data = start_data_binary;
   }else{
-    variables = mc_global_variables_libsimgrid;
-    types = mc_variables_type_libsimgrid;
-    other_types = mc_variables_type_binary;
+    object_info = mc_libsimgrid_info;
+    other_object_info = mc_binary_info;
     start_data = start_data_libsimgrid;
   }
+  variables = object_info->global_variables;
+  types = object_info->types;
+  other_types = other_object_info->types;
 
   xbt_dynar_foreach(variables, cursor, current_var){
 
-    if(region_type == 2)
-      offset = (char *)current_var->address.address - (char *)start_data_binary;
-    else
-      offset = (char *)current_var->address.address - (char *)start_data_libsimgrid;
+    // If the variable is not in this object, skip it:
+    // We do not expect to find a pointer to something which is not reachable
+    // by the global variables.
+    if((char*) current_var->address < (char*) object_info->start_rw
+      || (char*) current_var->address > (char*) object_info->end_rw)
+       continue;
+
+    offset = (char *)current_var->address - (char *)object_info->start_rw;
 
     res = compare_areas_with_type((char *)r1->data + offset, (char *)r2->data + offset, types, other_types, current_var->type_origin, r1->size, region_type, start_data, 0);
-    if(res == -1){
-      xbt_dynar_cursor_rm(variables, &cursor);
-    }else if(res == 1){
-      XBT_VERB("Global variable %s is different between snapshots", current_var->name);
+    if(res == 1){
+      XBT_VERB("Global variable %s (%p - %p) is different between snapshots", current_var->name, (char *)r1->data + offset, (char *)r2->data + offset);
+      xbt_dynar_free(&compared_pointers);
+      compared_pointers = NULL;
       return 1;
     }
 
   }
+
+  xbt_dynar_free(&compared_pointers);
+  compared_pointers = NULL;
+
   return 0;
 
 }
 
 static int compare_local_variables(mc_snapshot_stack_t stack1, mc_snapshot_stack_t stack2, void *heap1, void *heap2){
+  void* start_data_binary = mc_binary_info->start_rw;
+  void* start_data_libsimgrid = mc_libsimgrid_info->start_rw;
 
   if(!compared_pointers){
-    compared_pointers = xbt_dynar_new(sizeof(pointers_pair_t), NULL);
-    MC_ignore_global_variable("compared_pointers", 1);
+    compared_pointers = xbt_dynar_new(sizeof(pointers_pair_t), pointers_pair_free_voidp);
+    MC_ignore_global_variable("compared_pointers");
   }else{
     xbt_dynar_reset(compared_pointers);
   }
 
   if(xbt_dynar_length(stack1->local_variables) != xbt_dynar_length(stack2->local_variables)){
     XBT_VERB("Different number of local variables");
+    xbt_dynar_free(&compared_pointers);
+    compared_pointers = NULL;
     return 1;
   }else{
     unsigned int cursor = 0;
@@ -285,64 +331,55 @@ static int compare_local_variables(mc_snapshot_stack_t stack1, mc_snapshot_stack
     while(cursor < xbt_dynar_length(stack1->local_variables)){
       current_var1 = (local_variable_t)xbt_dynar_get_as(stack1->local_variables, cursor, local_variable_t);
       current_var2 = (local_variable_t)xbt_dynar_get_as(stack2->local_variables, cursor, local_variable_t);
-      if(strcmp(current_var1->name, current_var2->name) != 0 || strcmp(current_var1->frame, current_var2->frame) != 0 || current_var1->ip != current_var2->ip)
+      if(strcmp(current_var1->name, current_var2->name) != 0 || strcmp(current_var1->frame, current_var2->frame) != 0 || current_var1->ip != current_var2->ip){
+        xbt_dynar_free(&compared_pointers);
+        XBT_VERB("Different name of variable (%s - %s) or frame (%s - %s) or ip (%lu - %lu)", current_var1->name, current_var2->name, current_var1->frame, current_var2->frame, current_var1->ip, current_var2->ip);
         return 1;
+      }
       offset1 = (char *)current_var1->address - (char *)std_heap;
       offset2 = (char *)current_var2->address - (char *)std_heap;
       if(current_var1->region == 1)
-        res = compare_areas_with_type( (char *)heap1 + offset1, (char *)heap2 + offset2, mc_variables_type_libsimgrid, mc_variables_type_binary, current_var1->type, 0, 1, start_data_libsimgrid, 0l);
+        res = compare_areas_with_type( (char *)heap1 + offset1, (char *)heap2 + offset2, mc_libsimgrid_info->types, mc_binary_info->types, current_var1->type, 0, 1, start_data_libsimgrid, 0);
       else
-        res = compare_areas_with_type( (char *)heap1 + offset1, (char *)heap2 + offset2, mc_variables_type_binary, mc_variables_type_libsimgrid, current_var1->type, 0, 2, start_data_binary, 0l);
-      if(res != 0){
-        XBT_VERB("Local variable %s in frame %s  is different between snapshots", current_var1->name, current_var1->frame);
+        res = compare_areas_with_type( (char *)heap1 + offset1, (char *)heap2 + offset2, mc_binary_info->types, mc_libsimgrid_info->types, current_var1->type, 0, 2, start_data_binary, 0);
+      if(res == 1){
+        XBT_VERB("Local variable %s (%p - %p) in frame %s  is different between snapshots", current_var1->name,(char *)heap1 + offset1, (char *)heap2 + offset2, current_var1->frame);
+        xbt_dynar_free(&compared_pointers);
+        compared_pointers = NULL;
         return res;
       }
       cursor++;
     }
+    xbt_dynar_free(&compared_pointers);
+    compared_pointers = NULL;
     return 0;
   }
 }
 
+int snapshot_compare(void *state1, void *state2){
 
-static int heap_region_compare(void *d1, void *d2, size_t size){
+  mc_snapshot_t s1, s2;
+  int num1, num2;
   
-  size_t i = 0;
-  
-  for(i=0; i<size; i++){
-    if(memcmp(((char *)d1) + i, ((char *)d2) + i, 1) != 0){
-      if(XBT_LOG_ISENABLED(mc_compare, xbt_log_priority_verbose)){
-        XBT_VERB("Different byte (offset=%zu) (%p - %p) in heap region", i, (char *)d1 + i, (char *)d2 + i);
-      }
+  if(_sg_mc_property_file && _sg_mc_property_file[0] != '\0'){ /* Liveness MC */
+    s1 = ((mc_visited_pair_t)state1)->graph_state->system_state;
+    s2 = ((mc_visited_pair_t)state2)->graph_state->system_state;
+    num1 = ((mc_visited_pair_t)state1)->num;
+    num2 =  ((mc_visited_pair_t)state2)->num;
+    /* Firstly compare automaton state */
+    /*if(xbt_automaton_state_compare(((mc_pair_t)state1)->automaton_state, ((mc_pair_t)state2)->automaton_state) != 0)
       return 1;
-    }
+    if(xbt_automaton_propositional_symbols_compare_value(((mc_pair_t)state1)->atomic_propositions, ((mc_pair_t)state2)->atomic_propositions) != 0)
+    return 1;*/
+  }else{ /* Safety MC */
+    s1 = ((mc_visited_state_t)state1)->system_state;
+    s2 = ((mc_visited_state_t)state2)->system_state;
+    num1 = ((mc_visited_state_t)state1)->num;
+    num2 = ((mc_visited_state_t)state2)->num;
   }
-  
-  return 0;
-}
 
-static void stack_region_free(stack_region_t s){
-  if(s){
-    xbt_free(s->process_name);
-    xbt_free(s);
-  }
-}
-
-void stack_region_free_voidp(void *s){
-  stack_region_free((stack_region_t) * (void **) s);
-}
-
-int SIMIX_pre_mc_compare_snapshots(smx_simcall_t simcall,
-                                   mc_snapshot_t s1, mc_snapshot_t s2){
-  return snapshot_compare(s1, s2);
-}
-
-int snapshot_compare(mc_snapshot_t s1, mc_snapshot_t s2){
-
-  int raw_mem = (mmalloc_get_current_heap() == raw_heap);
-  
-  MC_SET_RAW_MEM;
-     
   int errors = 0;
+  int res_init;
 
   xbt_os_timer_t global_timer = xbt_os_timer_new();
   xbt_os_timer_t timer = xbt_os_timer_new();
@@ -366,22 +403,20 @@ int snapshot_compare(mc_snapshot_t s1, mc_snapshot_t s2){
         xbt_os_walltimer_stop(timer);
         mc_comp_times->stacks_sizes_comparison_time = xbt_os_timer_elapsed(timer);
       }
-      XBT_DEBUG("Different size used in stacks : %zu - %zu", size_used1, size_used2);
+      XBT_DEBUG("(%d - %d) Different size used in stacks : %zu - %zu", num1, num2, size_used1, size_used2);
       errors++;
       is_diff = 1;
     #else
       #ifdef MC_VERBOSE
-        XBT_VERB("Different size used in stacks : %zu - %zu", size_used1, size_used2);
+      XBT_VERB("(%d - %d) Different size used in stacks : %zu - %zu", num1, num2, size_used1, size_used2);
       #endif
 
+      xbt_os_walltimer_stop(timer);
       xbt_os_timer_free(timer);
       xbt_os_walltimer_stop(global_timer);
       mc_snapshot_comparison_time = xbt_os_timer_elapsed(global_timer);
       xbt_os_timer_free(global_timer);
 
-      if(!raw_mem)
-        MC_UNSET_RAW_MEM;
-
       return 1;
     #endif  
     }
@@ -407,13 +442,11 @@ int snapshot_compare(mc_snapshot_t s1, mc_snapshot_t s2){
           XBT_VERB("Different hash of global variables : %s - %s", s1->hash_global, s2->hash_global); 
         #endif
 
+        xbt_os_walltimer_stop(timer);
         xbt_os_timer_free(timer);
         xbt_os_walltimer_stop(global_timer);
         mc_snapshot_comparison_time = xbt_os_timer_elapsed(global_timer);
         xbt_os_timer_free(global_timer);
-    
-        if(!raw_mem)
-          MC_UNSET_RAW_MEM;
 
         return 1;
       #endif
@@ -437,14 +470,12 @@ int snapshot_compare(mc_snapshot_t s1, mc_snapshot_t s2){
           XBT_VERB("Different hash of local variables : %s - %s", s1->hash_local, s2->hash_local); 
         #endif
 
+        xbt_os_walltimer_stop(timer);
         xbt_os_timer_free(timer);
         xbt_os_walltimer_stop(global_timer);
         mc_snapshot_comparison_time = xbt_os_timer_elapsed(global_timer);
         xbt_os_timer_free(global_timer);
-        
-        if(!raw_mem)
-          MC_UNSET_RAW_MEM;
-        
+
         return 1;
       #endif
     }
@@ -455,7 +486,27 @@ int snapshot_compare(mc_snapshot_t s1, mc_snapshot_t s2){
   #endif
 
   /* Init heap information used in heap comparison algorithm */
-  init_heap_information((xbt_mheap_t)s1->regions[0]->data, (xbt_mheap_t)s2->regions[0]->data, s1->to_ignore, s2->to_ignore);
+  res_init = init_heap_information((xbt_mheap_t)s1->regions[0]->data, (xbt_mheap_t)s2->regions[0]->data, s1->to_ignore, s2->to_ignore);
+  if(res_init == -1){
+     #ifdef MC_DEBUG
+    XBT_DEBUG("(%d - %d) Different heap information", num1, num2); 
+        errors++; 
+      #else
+        #ifdef MC_VERBOSE
+        XBT_VERB("(%d - %d) Different heap information", num1, num2); 
+        #endif
+
+        xbt_os_walltimer_stop(global_timer);
+        mc_snapshot_comparison_time = xbt_os_timer_elapsed(global_timer);
+        xbt_os_timer_free(global_timer);
+
+        return 1;
+      #endif
+  }
+
+  #ifdef MC_DEBUG
+    xbt_os_walltimer_start(timer);
+  #endif
 
   /* Stacks comparison */
   unsigned int  cursor = 0;
@@ -473,122 +524,100 @@ int snapshot_compare(mc_snapshot_t s1, mc_snapshot_t s2){
           xbt_os_walltimer_stop(timer);
           mc_comp_times->stacks_comparison_time = xbt_os_timer_elapsed(timer);
         }
-        XBT_DEBUG("Different local variables between stacks %d", cursor + 1);
+        XBT_DEBUG("(%d - %d) Different local variables between stacks %d", num1, num2, cursor + 1);
         errors++;
         is_diff = 1;
       #else
         
         #ifdef MC_VERBOSE
-          XBT_VERB("Different local variables between stacks %d", cursor + 1);
+        XBT_VERB("(%d - %d) Different local variables between stacks %d", num1, num2, cursor + 1);
         #endif
           
         reset_heap_information();
+        xbt_os_walltimer_stop(timer);
         xbt_os_timer_free(timer);
         xbt_os_walltimer_stop(global_timer);
         mc_snapshot_comparison_time = xbt_os_timer_elapsed(global_timer);
         xbt_os_timer_free(global_timer);
-        
-        if(!raw_mem)
-          MC_UNSET_RAW_MEM;
-        
+ 
         return 1;
       #endif
     }
     cursor++;
   }
 
-  #ifdef MC_DEBUG
-    if(is_diff == 0)
-      xbt_os_walltimer_stop(timer);
-    xbt_os_walltimer_start(timer);
-  #endif
 
-  /* Compare binary global variables */
-  is_diff = compare_global_variables(2, s1->regions[2], s2->regions[2]);
-  if(is_diff != 0){
-    #ifdef MC_DEBUG
-      xbt_os_walltimer_stop(timer);
-      mc_comp_times->binary_global_variables_comparison_time = xbt_os_timer_elapsed(timer);
-      XBT_DEBUG("Different global variables in binary");
-      errors++;
-    #else
-      #ifdef MC_VERBOSE
-        XBT_VERB("Different global variables in binary");
-      #endif
 
-      reset_heap_information();
-      xbt_os_timer_free(timer);
-      xbt_os_walltimer_stop(global_timer);
-      mc_snapshot_comparison_time = xbt_os_timer_elapsed(global_timer);
-      xbt_os_timer_free(global_timer);
-    
-      if(!raw_mem)
-        MC_UNSET_RAW_MEM;
+ const char* names[3] = { "?", "libsimgrid", "binary" };
+#ifdef MC_DEBUG
+ double *times[3] = {
+   NULL,
+   &mc_comp_times->libsimgrid_global_variables_comparison_time,
+   &mc_comp_times->binary_global_variables_comparison_time
+ };
+#endif
 
-      return 1;
+ int k=0;
+ for(k=2; k!=0; --k) {
+    #ifdef MC_DEBUG
+      if(is_diff == 0)
+        xbt_os_walltimer_stop(timer);
+      xbt_os_walltimer_start(timer);
     #endif
-  }
-
-  #ifdef MC_DEBUG
-    if(is_diff == 0)
-      xbt_os_walltimer_stop(timer);
-    xbt_os_walltimer_start(timer);
-  #endif
 
-  /* Compare libsimgrid global variables */
-  is_diff = compare_global_variables(1, s1->regions[1], s2->regions[1]);
+  /* Compare global variables */
+  is_diff = compare_global_variables(k, s1->regions[k], s2->regions[k]);
   if(is_diff != 0){
     #ifdef MC_DEBUG
       xbt_os_walltimer_stop(timer);
-      mc_comp_times->libsimgrid_global_variables_comparison_time = xbt_os_timer_elapsed(timer);
-      XBT_DEBUG("Different global variables in libsimgrid");
+      *times[k] = xbt_os_timer_elapsed(timer);
+      XBT_DEBUG("(%d - %d) Different global variables in %s", num1, num2, names[k]);
       errors++;
     #else
       #ifdef MC_VERBOSE
-        XBT_VERB("Different global variables in libsimgrid");
+      XBT_VERB("(%d - %d) Different global variables in %s", num1, num2, names[k]);
       #endif
-        
+
       reset_heap_information();
+      xbt_os_walltimer_stop(timer);
       xbt_os_timer_free(timer);
       xbt_os_walltimer_stop(global_timer);
       mc_snapshot_comparison_time = xbt_os_timer_elapsed(global_timer);
       xbt_os_timer_free(global_timer);
-    
-      if(!raw_mem)
-        MC_UNSET_RAW_MEM;
 
       return 1;
     #endif
   }
-    
+ }
+
   #ifdef MC_DEBUG
     xbt_os_walltimer_start(timer);
   #endif
 
   /* Compare heap */
-  if(mmalloc_compare_heap((xbt_mheap_t)s1->regions[0]->data, (xbt_mheap_t)s2->regions[0]->data) > 0){
+    if(mmalloc_compare_heap((xbt_mheap_t)s1->regions[0]->data,
+                            (xbt_mheap_t)s2->regions[0]->data,
+                            mc_libsimgrid_info->types,
+                            mc_binary_info->types) > 0){
 
     #ifdef MC_DEBUG
       xbt_os_walltimer_stop(timer);
       mc_comp_times->heap_comparison_time = xbt_os_timer_elapsed(timer); 
-      XBT_DEBUG("Different heap (mmalloc_compare)");
+      XBT_DEBUG("(%d - %d) Different heap (mmalloc_compare)", num1, num2);
       errors++;
     #else
-
-      xbt_os_timer_free(timer);
  
       #ifdef MC_VERBOSE
-        XBT_VERB("Different heap (mmalloc_compare)");
+      XBT_VERB("(%d - %d) Different heap (mmalloc_compare)", num1, num2);
       #endif
        
       reset_heap_information();
+      xbt_os_walltimer_stop(timer);
+      xbt_os_timer_free(timer);
       xbt_os_walltimer_stop(global_timer);
       mc_snapshot_comparison_time = xbt_os_timer_elapsed(global_timer);
       xbt_os_timer_free(global_timer);
 
-      if(!raw_mem)
-        MC_UNSET_RAW_MEM;
-
       return 1;
     #endif
   }else{
@@ -598,7 +627,8 @@ int snapshot_compare(mc_snapshot_t s1, mc_snapshot_t s2){
   }
 
   reset_heap_information();
-   
+  
+  xbt_os_walltimer_stop(timer);
   xbt_os_timer_free(timer);
 
   #ifdef MC_VERBOSE
@@ -612,20 +642,12 @@ int snapshot_compare(mc_snapshot_t s1, mc_snapshot_t s2){
     print_comparison_times();
   #endif
 
-  if(!raw_mem)
-    MC_UNSET_RAW_MEM;
-
   return errors > 0;
   
 }
 
-int MC_compare_snapshots(void *s1, void *s2){
-  
-  MC_ignore_local_variable("self", "simcall_BODY_mc_snapshot", 1);
- 
-  return simcall_mc_compare_snapshots(s1, s2);
-
-}
+/***************************** Statistics *****************************/
+/*******************************************************************/
 
 void print_comparison_times(){
   XBT_DEBUG("*** Comparison times ***");
@@ -637,3 +659,18 @@ void print_comparison_times(){
   XBT_DEBUG("- Heap : %f", mc_comp_times->heap_comparison_time);
   XBT_DEBUG("- Stacks : %f", mc_comp_times->stacks_comparison_time);
 }
+
+/**************************** MC snapshot compare simcall **************************/
+/***********************************************************************************/
+
+int SIMIX_pre_mc_compare_snapshots(smx_simcall_t simcall,
+                                   mc_snapshot_t s1, mc_snapshot_t s2){
+  return snapshot_compare(s1, s2);
+}
+
+int MC_compare_snapshots(void *s1, void *s2){
+  
+  MC_ignore_local_variable("self", "simcall_BODY_mc_snapshot");
+  return simcall_mc_compare_snapshots(s1, s2);
+
+}