src/xbt/mmalloc/mm_diff.c

   1 /* mm_diff - Memory snapshooting and comparison                             */
   2
   3 /* Copyright (c) 2008-2012. The SimGrid Team. All rights reserved.          */
   4
   5 /* This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the license (GNU LGPL) which comes with this package. */
   7
   8 #include "xbt/ex_interface.h" /* internals of backtrace setup */
   9 #include "xbt/str.h"
  10 #include "mc/mc.h"
  11 #include "xbt/mmalloc.h"
  12
  13 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mm_diff, xbt,
  14                                 "Logging specific to mm_diff in mmalloc");
  15
  16 xbt_dynar_t mc_heap_comparison_ignore;
  17 xbt_dynar_t stacks_areas;
  18 void *maestro_stack_start, *maestro_stack_end;
  19
  20 static void heap_area_pair_free(heap_area_pair_t pair);
  21 static void heap_area_pair_free_voidp(void *d);
  22 static int add_heap_area_pair(xbt_dynar_t list, int block1, int fragment1, int block2, int fragment2);
  23 static int is_new_heap_area_pair(xbt_dynar_t list, int block1, int fragment1, int block2, int fragment2);
  24 static heap_area_t new_heap_area(int block, int fragment);
  25
  26 static size_t heap_comparison_ignore_size(xbt_dynar_t list, void *address);
  27 static void add_heap_equality(xbt_dynar_t equals, void *a1, void *a2);
  28 static void remove_heap_equality(xbt_dynar_t equals, int address, void *a);
  29
  30 static int is_stack(void *address);
  31 static int is_block_stack(int block);
  32 static int equal_blocks(int b1, int b2);
  33 static int equal_fragments(int b1, int f1, int b2, int f2);
  34
  35 void mmalloc_backtrace_block_display(void* heapinfo, int block){
  36
  37   /* xbt_ex_t e; */
  38
  39   /* if (((malloc_info *)heapinfo)[block].busy_block.bt_size == 0) { */
  40   /*   fprintf(stderr, "No backtrace available for that block, sorry.\n"); */
  41   /*   return; */
  42   /* } */
  43
  44   /* memcpy(&e.bt,&(((malloc_info *)heapinfo)[block].busy_block.bt),sizeof(void*)*XBT_BACKTRACE_SIZE); */
  45   /* e.used = ((malloc_info *)heapinfo)[block].busy_block.bt_size; */
  46
  47   /* xbt_ex_setup_backtrace(&e); */
  48   /* if (e.used == 0) { */
  49   /*   fprintf(stderr, "(backtrace not set)\n"); */
  50   /* } else if (e.bt_strings == NULL) { */
  51   /*   fprintf(stderr, "(backtrace not ready to be computed. %s)\n",xbt_binary_name?"Dunno why":"xbt_binary_name not setup yet"); */
  52   /* } else { */
  53   /*   int i; */
  54
  55   /*   fprintf(stderr, "Backtrace of where the block %d was malloced (%d frames):\n", block ,e.used); */
  56   /*   for (i = 0; i < e.used; i++)       /\* no need to display "xbt_backtrace_display" *\/{ */
  57   /*     fprintf(stderr, "%d ---> %s\n",i, e.bt_strings[i] + 4); */
  58   /*   } */
  59   /* } */
  60 }
  61
  62 void mmalloc_backtrace_fragment_display(void* heapinfo, int block, int frag){
  63
  64   /* xbt_ex_t e; */
  65
  66   /* memcpy(&e.bt,&(((malloc_info *)heapinfo)[block].busy_frag.bt[frag]),sizeof(void*)*XBT_BACKTRACE_SIZE); */
  67   /* e.used = XBT_BACKTRACE_SIZE; */
  68
  69   /* xbt_ex_setup_backtrace(&e); */
  70   /* if (e.used == 0) { */
  71   /*   fprintf(stderr, "(backtrace not set)\n"); */
  72   /* } else if (e.bt_strings == NULL) { */
  73   /*   fprintf(stderr, "(backtrace not ready to be computed. %s)\n",xbt_binary_name?"Dunno why":"xbt_binary_name not setup yet"); */
  74   /* } else { */
  75   /*   int i; */
  76
  77   /*   fprintf(stderr, "Backtrace of where the fragment %d in block %d was malloced (%d frames):\n", frag, block ,e.used); */
  78   /*   for (i = 0; i < e.used; i++)       /\* no need to display "xbt_backtrace_display" *\/{ */
  79   /*     fprintf(stderr, "%d ---> %s\n",i, e.bt_strings[i] + 4); */
  80   /*   } */
  81   /* } */
  82
  83 }
  84
  85 void mmalloc_backtrace_display(void *addr){
  86
  87   /* size_t block, frag_nb; */
  88   /* int type; */
  89
  90   /* xbt_mheap_t heap = __mmalloc_current_heap ?: (xbt_mheap_t) mmalloc_preinit(); */
  91
  92   /* block = (((char*) (addr) - (char*) heap -> heapbase) / BLOCKSIZE + 1); */
  93
  94   /* type = heap->heapinfo[block].type; */
  95
  96   /* switch(type){ */
  97   /* case -1 : /\* Free block *\/ */
  98   /*   fprintf(stderr, "Asked to display the backtrace of a block that is free. I'm puzzled\n"); */
  99   /*   xbt_abort(); */
 100   /*   break;  */
 101   /* case 0: /\* Large block *\/ */
 102   /*   mmalloc_backtrace_block_display(heap->heapinfo, block); */
 103   /*   break; */
 104   /* default: /\* Fragmented block *\/ */
 105   /*   frag_nb = RESIDUAL(addr, BLOCKSIZE) >> type; */
 106   /*   if(heap->heapinfo[block].busy_frag.frag_size[frag_nb] == -1){ */
 107   /*     fprintf(stderr , "Asked to display the backtrace of a fragment that is free. I'm puzzled\n"); */
 108   /*     xbt_abort(); */
 109   /*   } */
 110   /*   mmalloc_backtrace_fragment_display(heap->heapinfo, block, frag_nb); */
 111   /*   break; */
 112   /* } */
 113 }
 114
 115
 116 void *s_heap = NULL, *heapbase1 = NULL, *heapbase2 = NULL;
 117 malloc_info *heapinfo1 = NULL, *heapinfo2 = NULL;
 118 size_t heaplimit = 0, heapsize1 = 0, heapsize2 = 0;
 119 xbt_dynar_t to_ignore1 = NULL, to_ignore2 = NULL;
 120
 121 void init_heap_information(xbt_mheap_t heap1, xbt_mheap_t heap2, xbt_dynar_t i1, xbt_dynar_t i2){
 122
 123   heaplimit = ((struct mdesc *)heap1)->heaplimit;
 124
 125   s_heap = (char *)mmalloc_get_current_heap() - STD_HEAP_SIZE - getpagesize();
 126
 127   heapbase1 = (char *)heap1 + BLOCKSIZE;
 128   heapbase2 = (char *)heap2 + BLOCKSIZE;
 129
 130   heapinfo1 = (malloc_info *)((char *)heap1 + ((uintptr_t)((char *)((struct mdesc *)heap1)->heapinfo - (char *)s_heap)));
 131   heapinfo2 = (malloc_info *)((char *)heap2 + ((uintptr_t)((char *)((struct mdesc *)heap2)->heapinfo - (char *)s_heap)));
 132
 133   heapsize1 = heap1->heapsize;
 134   heapsize2 = heap2->heapsize;
 135
 136   to_ignore1 = i1;
 137   to_ignore2 = i2;
 138
 139   if(MC_is_active()){
 140     MC_ignore_data_bss(&heaplimit, sizeof(heaplimit));
 141     MC_ignore_data_bss(&s_heap, sizeof(s_heap));
 142     MC_ignore_data_bss(&heapbase1, sizeof(heapbase1));
 143     MC_ignore_data_bss(&heapbase2, sizeof(heapbase2));
 144     MC_ignore_data_bss(&heapinfo1, sizeof(heapinfo1));
 145     MC_ignore_data_bss(&heapinfo2, sizeof(heapinfo2));
 146     MC_ignore_data_bss(&heapsize1, sizeof(heapsize1));
 147     MC_ignore_data_bss(&heapsize2, sizeof(heapsize2));
 148     MC_ignore_data_bss(&to_ignore1, sizeof(to_ignore1));
 149     MC_ignore_data_bss(&to_ignore2, sizeof(to_ignore2));
 150   }
 151 }
 152
 153 int mmalloc_compare_heap(xbt_mheap_t heap1, xbt_mheap_t heap2){
 154
 155   if(heap1 == NULL && heap1 == NULL){
 156     XBT_DEBUG("Malloc descriptors null");
 157     return 0;
 158   }
 159
 160   if(heap1->heaplimit != heap2->heaplimit){
 161     XBT_DEBUG("Different limit of valid info table indices");
 162     return 1;
 163   }
 164
 165   /* Start comparison */
 166   size_t i1, i2, j1, j2, k;
 167   size_t current_block = -1;    /* avoid "maybe uninitialized" warning */
 168   size_t current_fragment;
 169   void *addr_block1, *addr_block2, *addr_frag1, *addr_frag2;
 170   int nb_diff1 = 0, nb_diff2 = 0;
 171
 172   xbt_dynar_t previous = xbt_dynar_new(sizeof(heap_area_pair_t), heap_area_pair_free_voidp);
 173
 174   int equal, res_compare = 0;
 175
 176   /* Check busy blocks*/
 177
 178   i1 = 1;
 179
 180   while(i1 <= heaplimit){
 181
 182     current_block = i1;
 183
 184     if(heapinfo1[i1].type == -1){ /* Free block */
 185       i1++;
 186       continue;
 187     }
 188
 189     addr_block1 = ((void*) (((ADDR2UINT(i1)) - 1) * BLOCKSIZE + (char*)((xbt_mheap_t)s_heap)->heapbase));
 190
 191     if(heapinfo1[i1].type == 0){  /* Large block */
 192
 193       if(is_stack(addr_block1)){
 194         for(k=0; k < heapinfo1[i1].busy_block.size; k++)
 195           heapinfo1[i1+k].busy_block.equal_to = new_heap_area(i1, -1);
 196         for(k=0; k < heapinfo2[i1].busy_block.size; k++)
 197           heapinfo2[i1+k].busy_block.equal_to = new_heap_area(i1, -1);
 198         i1 = i1 + heapinfo1[current_block].busy_block.size;
 199         continue;
 200       }
 201
 202       if(heapinfo1[i1].busy_block.equal_to != NULL){
 203         i1++;
 204         continue;
 205       }
 206
 207       i2 = 1;
 208       equal = 0;
 209       res_compare = 0;
 210
 211       /* Try first to associate to same block in the other heap */
 212       if(heapinfo2[current_block].type == heapinfo1[current_block].type){
 213
 214         if(heapinfo2[current_block].busy_block.equal_to == NULL){
 215
 216           addr_block2 = ((void*) (((ADDR2UINT(current_block)) - 1) * BLOCKSIZE + (char*)((xbt_mheap_t)s_heap)->heapbase));
 217
 218           res_compare = compare_area(addr_block1, addr_block2, previous);
 219
 220           if(res_compare == 0){
 221             for(k=1; k < heapinfo2[current_block].busy_block.size; k++)
 222               heapinfo2[current_block+k].busy_block.equal_to = new_heap_area(i1, -1);
 223             for(k=1; k < heapinfo1[current_block].busy_block.size; k++)
 224               heapinfo1[current_block+k].busy_block.equal_to = new_heap_area(i1, -1);
 225             equal = 1;
 226             match_equals(previous);
 227             i1 = i1 + heapinfo1[current_block].busy_block.size;
 228           }
 229
 230           xbt_dynar_reset(previous);
 231
 232         }
 233
 234       }
 235
 236       while(i2 <= heaplimit && !equal){
 237
 238         addr_block2 = ((void*) (((ADDR2UINT(i2)) - 1) * BLOCKSIZE + (char*)((xbt_mheap_t)s_heap)->heapbase));
 239
 240         if(i2 == current_block){
 241           i2++;
 242           continue;
 243         }
 244
 245         if(heapinfo2[i2].type != 0){
 246           i2++;
 247           continue;
 248         }
 249
 250         if(heapinfo2[i2].busy_block.equal_to != NULL){
 251           i2++;
 252           continue;
 253         }
 254
 255         res_compare = compare_area(addr_block1, addr_block2, previous);
 256
 257         if(res_compare == 0){
 258           for(k=1; k < heapinfo2[i2].busy_block.size; k++)
 259             heapinfo2[i2+k].busy_block.equal_to = new_heap_area(i1, -1);
 260           for(k=1; k < heapinfo1[i1].busy_block.size; k++)
 261             heapinfo1[i1+k].busy_block.equal_to = new_heap_area(i2, -1);
 262           equal = 1;
 263           match_equals(previous);
 264           i1 = i1 + heapinfo1[i1].busy_block.size;
 265         }
 266
 267         xbt_dynar_reset(previous);
 268
 269         i2++;
 270
 271       }
 272
 273       if(!equal){
 274         XBT_DEBUG("Block %zu not found (size_used = %zu, addr = %p)", i1, heapinfo1[i1].busy_block.busy_size, addr_block1);
 275         i1 = heaplimit + 1;
 276         nb_diff1++;
 277       }
 278
 279     }else{ /* Fragmented block */
 280
 281       for(j1=0; j1 < (size_t) (BLOCKSIZE >> heapinfo1[i1].type); j1++){
 282
 283         current_fragment = j1;
 284
 285         if(heapinfo1[i1].busy_frag.frag_size[j1] == -1) /* Free fragment */
 286           continue;
 287
 288         if(heapinfo1[i1].busy_frag.equal_to[j1] != NULL)
 289           continue;
 290
 291         addr_frag1 = (void*) ((char *)addr_block1 + (j1 << heapinfo1[i1].type));
 292
 293         i2 = 1;
 294         equal = 0;
 295
 296         /* Try first to associate to same fragment in the other heap */
 297         if(heapinfo2[current_block].type == heapinfo1[current_block].type){
 298
 299           if(heapinfo2[current_block].busy_frag.equal_to[current_fragment] == NULL){
 300
 301             addr_block2 = ((void*) (((ADDR2UINT(current_block)) - 1) * BLOCKSIZE + (char*)((xbt_mheap_t)s_heap)->heapbase));
 302             addr_frag2 = (void*) ((char *)addr_block2 + (current_fragment << ((xbt_mheap_t)s_heap)->heapinfo[current_block].type));
 303
 304             res_compare = compare_area(addr_frag1, addr_frag2, previous);
 305
 306             if(res_compare == 0){
 307               equal = 1;
 308               match_equals(previous);
 309             }
 310
 311             xbt_dynar_reset(previous);
 312
 313             }
 314         }
 315
 316         while(i2 <= heaplimit && !equal){
 317
 318
 319           if(heapinfo2[i2].type <= 0){
 320             i2++;
 321             continue;
 322           }
 323
 324           for(j2=0; j2 < (size_t) (BLOCKSIZE >> heapinfo2[i2].type); j2++){
 325
 326             if(heapinfo2[i2].type == heapinfo1[i1].type && i2 == current_block && j2 == current_fragment)
 327               continue;
 328
 329             if(heapinfo2[i2].busy_frag.equal_to[j2] != NULL)
 330               continue;
 331
 332             addr_block2 = ((void*) (((ADDR2UINT(i2)) - 1) * BLOCKSIZE + (char*)((xbt_mheap_t)s_heap)->heapbase));
 333             addr_frag2 = (void*) ((char *)addr_block2 + (j2 << ((xbt_mheap_t)s_heap)->heapinfo[i2].type));
 334
 335             res_compare = compare_area(addr_frag1, addr_frag2, previous);
 336
 337             if(res_compare == 0){
 338               equal = 1;
 339               match_equals(previous);
 340               xbt_dynar_reset(previous);
 341               break;
 342             }
 343
 344             xbt_dynar_reset(previous);
 345
 346           }
 347
 348           i2++;
 349
 350         }
 351
 352         if(heapinfo1[i1].busy_frag.equal_to[j1] == NULL){
 353           XBT_DEBUG("Block %zu, fragment %zu not found (size_used = %zd, address = %p, ignore %d)", i1, j1, heapinfo1[i1].busy_frag.frag_size[j1], addr_frag1, heapinfo1[i1].busy_frag.ignore[j1]);
 354           i2 = heaplimit + 1;
 355           i1 = heaplimit + 1;
 356           nb_diff1++;
 357           break;
 358         }
 359
 360       }
 361
 362       i1++;
 363
 364     }
 365
 366   }
 367
 368   /* All blocks/fragments are equal to another block/fragment ? */
 369   size_t i = 1, j = 0;
 370   void *real_addr_frag1 = NULL, *real_addr_block1 = NULL, *real_addr_block2 = NULL, *real_addr_frag2 = NULL;
 371
 372   while(i<=heaplimit){
 373     if(heapinfo1[i].type == 0){
 374       if(current_block == heaplimit){
 375         if(heapinfo1[i].busy_block.busy_size > 0){
 376           if(heapinfo1[i].busy_block.equal_to == NULL){
 377             if(XBT_LOG_ISENABLED(mm_diff, xbt_log_priority_debug)){
 378               addr_block1 = ((void*) (((ADDR2UINT(i)) - 1) * BLOCKSIZE + (char*)heapbase1));
 379               XBT_DEBUG("Block %zu (%p) not found (size used = %zu)", i, addr_block1, heapinfo1[i].busy_block.busy_size);
 380               //mmalloc_backtrace_block_display((void*)heapinfo1, i);
 381             }
 382             nb_diff1++;
 383           }
 384         }
 385       }
 386     }
 387     if(heapinfo1[i].type > 0){
 388       addr_block1 = ((void*) (((ADDR2UINT(i)) - 1) * BLOCKSIZE + (char*)heapbase1));
 389       real_addr_block1 =  ((void*) (((ADDR2UINT(i)) - 1) * BLOCKSIZE + (char*)((struct mdesc *)s_heap)->heapbase));
 390       for(j=0; j < (size_t) (BLOCKSIZE >> heapinfo1[i].type); j++){
 391         if(current_block == heaplimit){
 392           if(heapinfo1[i].busy_frag.frag_size[j] > 0){
 393             if(heapinfo1[i].busy_frag.equal_to[j] == NULL){
 394               if(XBT_LOG_ISENABLED(mm_diff, xbt_log_priority_debug)){
 395                 addr_frag1 = (void*) ((char *)addr_block1 + (j << heapinfo1[i].type));
 396                 real_addr_frag1 = (void*) ((char *)real_addr_block1 + (j << ((struct mdesc *)s_heap)->heapinfo[i].type));
 397                 XBT_DEBUG("Block %zu, Fragment %zu (%p - %p) not found (size used = %zd)", i, j, addr_frag1, real_addr_frag1, heapinfo1[i].busy_frag.frag_size[j]);
 398                 //mmalloc_backtrace_fragment_display((void*)heapinfo1, i, j);
 399               }
 400               nb_diff1++;
 401             }
 402           }
 403         }
 404       }
 405     }
 406     i++;
 407   }
 408
 409   if(current_block == heaplimit)
 410     XBT_DEBUG("Number of blocks/fragments not found in heap1 : %d", nb_diff1);
 411
 412   i = 1;
 413
 414   while(i<=heaplimit){
 415     if(heapinfo2[i].type == 0){
 416       if(current_block == heaplimit){
 417         if(heapinfo2[i].busy_block.busy_size > 0){
 418           if(heapinfo2[i].busy_block.equal_to == NULL){
 419             if(XBT_LOG_ISENABLED(mm_diff, xbt_log_priority_debug)){
 420               addr_block2 = ((void*) (((ADDR2UINT(i)) - 1) * BLOCKSIZE + (char*)heapbase2));
 421               XBT_DEBUG("Block %zu (%p) not found (size used = %zu)", i, addr_block2, heapinfo2[i].busy_block.busy_size);
 422               //mmalloc_backtrace_block_display((void*)heapinfo2, i);
 423             }
 424             nb_diff2++;
 425           }
 426         }
 427       }
 428     }
 429     if(heapinfo2[i].type > 0){
 430       addr_block2 = ((void*) (((ADDR2UINT(i)) - 1) * BLOCKSIZE + (char*)heapbase2));
 431       real_addr_block2 =  ((void*) (((ADDR2UINT(i)) - 1) * BLOCKSIZE + (char*)((struct mdesc *)s_heap)->heapbase));
 432       for(j=0; j < (size_t) (BLOCKSIZE >> heapinfo2[i].type); j++){
 433         if(current_block == heaplimit){
 434           if(heapinfo2[i].busy_frag.frag_size[j] > 0){
 435             if(heapinfo2[i].busy_frag.equal_to[j] == NULL){
 436               if(XBT_LOG_ISENABLED(mm_diff, xbt_log_priority_debug)){
 437                 addr_frag2 = (void*) ((char *)addr_block2 + (j << heapinfo2[i].type));
 438                 real_addr_frag2 = (void*) ((char *)real_addr_block2 + (j << ((struct mdesc *)s_heap)->heapinfo[i].type));
 439                 XBT_DEBUG( "Block %zu, Fragment %zu (%p - %p) not found (size used = %zd)", i, j, addr_frag2, real_addr_frag2, heapinfo2[i].busy_frag.frag_size[j]);
 440                 //mmalloc_backtrace_fragment_display((void*)heapinfo2, i, j);
 441               }
 442               nb_diff2++;
 443             }
 444           }
 445         }
 446       }
 447     }
 448     i++;
 449   }
 450
 451   if(current_block == heaplimit)
 452     XBT_DEBUG("Number of blocks/fragments not found in heap2 : %d", nb_diff2);
 453
 454   xbt_dynar_free(&previous);
 455   real_addr_frag1 = NULL, real_addr_block1 = NULL, real_addr_block2 = NULL, real_addr_frag2 = NULL;
 456
 457   return ((nb_diff1 > 0) || (nb_diff2 > 0));
 458 }
 459
 460 void reset_heap_information(){
 461
 462   size_t i = 0, j;
 463
 464   while(i<=heaplimit){
 465     if(heapinfo1[i].type == 0){
 466       xbt_free(heapinfo1[i].busy_block.equal_to);
 467       heapinfo1[i].busy_block.equal_to = NULL;
 468     }
 469     if(heapinfo1[i].type > 0){
 470       for(j=0; j < (size_t) (BLOCKSIZE >> heapinfo1[i].type); j++){
 471         xbt_free(heapinfo1[i].busy_frag.equal_to[j]);
 472         heapinfo1[i].busy_frag.equal_to[j] = NULL;
 473       }
 474     }
 475     i++;
 476   }
 477
 478   i = 0;
 479
 480   while(i<=heaplimit){
 481     if(heapinfo2[i].type == 0){
 482       xbt_free(heapinfo2[i].busy_block.equal_to);
 483       heapinfo2[i].busy_block.equal_to = NULL;
 484     }
 485     if(heapinfo2[i].type > 0){
 486       for(j=0; j < (size_t) (BLOCKSIZE >> heapinfo2[i].type); j++){
 487         xbt_free(heapinfo2[i].busy_frag.equal_to[j]);
 488         heapinfo2[i].busy_frag.equal_to[j] = NULL;
 489       }
 490     }
 491     i++;
 492   }
 493
 494   s_heap = NULL, heapbase1 = NULL, heapbase2 = NULL;
 495   heapinfo1 = NULL, heapinfo2 = NULL;
 496   heaplimit = 0, heapsize1 = 0, heapsize2 = 0;
 497   to_ignore1 = NULL, to_ignore2 = NULL;
 498
 499 }
 500
 501 static heap_area_t new_heap_area(int block, int fragment){
 502   heap_area_t area = NULL;
 503   area = xbt_new0(s_heap_area_t, 1);
 504   area->block = block;
 505   area->fragment = fragment;
 506   return area;
 507 }
 508
 509
 510 static size_t heap_comparison_ignore_size(xbt_dynar_t ignore_list, void *address){
 511
 512   unsigned int cursor = 0;
 513   int start = 0;
 514   int end = xbt_dynar_length(ignore_list) - 1;
 515   mc_heap_ignore_region_t region;
 516
 517   while(start <= end){
 518     cursor = (start + end) / 2;
 519     region = (mc_heap_ignore_region_t)xbt_dynar_get_as(ignore_list, cursor, mc_heap_ignore_region_t);
 520     if(region->address == address)
 521       return region->size;
 522     if(region->address < address)
 523       start = cursor + 1;
 524     if(region->address > address)
 525       end = cursor - 1;
 526   }
 527
 528   return 0;
 529 }
 530
 531
 532 int compare_area(void *area1, void* area2, xbt_dynar_t previous){ /* Return code : 0 = equal, 1 = same size but different bytes, 2 = different size used */
 533
 534   size_t i = 0, pointer_align = 0, ignore1 = 0, ignore2 = 0;
 535   void *addr_pointed1, *addr_pointed2;
 536   int res_compare;
 537   ssize_t block1, frag1, block2, frag2;
 538   ssize_t size;
 539   int check_ignore = 0;
 540   int j;
 541
 542   void *addr_block1, *addr_block2, *addr_frag1, *addr_frag2;
 543   void *area1_to_compare, *area2_to_compare;
 544
 545   int match_pairs = 0;
 546
 547   if(previous == NULL){
 548     previous = xbt_dynar_new(sizeof(heap_area_pair_t), heap_area_pair_free_voidp);
 549     match_pairs = 1;
 550   }
 551
 552   block1 = ((char*)area1 - (char*)((xbt_mheap_t)s_heap)->heapbase) / BLOCKSIZE + 1;
 553   block2 = ((char*)area2 - (char*)((xbt_mheap_t)s_heap)->heapbase) / BLOCKSIZE + 1;
 554
 555   if(is_block_stack((int)block1) && is_block_stack((int)block2)){
 556     add_heap_area_pair(previous, block1, -1, block2, -1);
 557     if(match_pairs){
 558       match_equals(previous);
 559       xbt_dynar_free(&previous);
 560     }
 561     return 0;
 562   }
 563
 564   if(((char *)area1 < (char*)((xbt_mheap_t)s_heap)->heapbase)  || (block1 > heapsize1) || (block1 < 1) || ((char *)area2 < (char*)((xbt_mheap_t)s_heap)->heapbase) || (block2 > heapsize2) || (block2 < 1)){
 565     if(match_pairs){
 566       xbt_dynar_free(&previous);
 567     }
 568     return 1;
 569   }
 570
 571   addr_block1 = ((void*) (((ADDR2UINT(block1)) - 1) * BLOCKSIZE + (char*)heapbase1));
 572   addr_block2 = ((void*) (((ADDR2UINT(block2)) - 1) * BLOCKSIZE + (char*)heapbase2));
 573
 574   if(heapinfo1[block1].type == heapinfo2[block2].type){
 575
 576     if(heapinfo1[block1].type == -1){
 577       if(match_pairs){
 578         match_equals(previous);
 579         xbt_dynar_free(&previous);
 580       }
 581       return 0;
 582     }else if(heapinfo1[block1].type == 0){
 583
 584       if(heapinfo1[block1].busy_block.equal_to != NULL || heapinfo2[block2].busy_block.equal_to != NULL){
 585         if(equal_blocks(block1, block2)){
 586           if(match_pairs){
 587             match_equals(previous);
 588             xbt_dynar_free(&previous);
 589           }
 590           return 0;
 591         }else{
 592           if(match_pairs){
 593             xbt_dynar_free(&previous);
 594           }
 595           return 1;
 596         }
 597       }
 598
 599       if(heapinfo1[block1].busy_block.size != heapinfo2[block2].busy_block.size){
 600         if(match_pairs){
 601           xbt_dynar_free(&previous);
 602         }
 603         return 1;
 604       }
 605
 606       if(heapinfo1[block1].busy_block.busy_size != heapinfo2[block2].busy_block.busy_size){
 607         if(match_pairs){
 608           xbt_dynar_free(&previous);
 609         }
 610         return 2;
 611       }
 612
 613       if(!add_heap_area_pair(previous, block1, -1, block2, -1)){
 614         if(match_pairs){
 615           match_equals(previous);
 616           xbt_dynar_free(&previous);
 617         }
 618         return 0;
 619       }
 620
 621       size = heapinfo1[block1].busy_block.busy_size;
 622
 623       if(size <= 0){
 624         if(match_pairs){
 625           match_equals(previous);
 626           xbt_dynar_free(&previous);
 627         }
 628         return 0;
 629       }
 630
 631       frag1 = -1;
 632       frag2 = -1;
 633
 634       area1_to_compare = addr_block1;
 635       area2_to_compare = addr_block2;
 636
 637       if(heapinfo1[block1].busy_block.ignore == 1 && heapinfo2[block2].busy_block.ignore == 1)
 638         check_ignore = 1;
 639
 640     }else{
 641       frag1 = ((uintptr_t) (ADDR2UINT (area1) % (BLOCKSIZE))) >> heapinfo1[block1].type;
 642       frag2 = ((uintptr_t) (ADDR2UINT (area2) % (BLOCKSIZE))) >> heapinfo2[block2].type;
 643
 644       addr_frag1 = (void*) ((char *)addr_block1 + (frag1 << heapinfo1[block1].type));
 645       addr_frag2 = (void*) ((char *)addr_block2 + (frag2 << heapinfo2[block2].type));
 646
 647       area1_to_compare = addr_frag1;
 648       area2_to_compare = addr_frag2;
 649
 650       if(heapinfo1[block1].busy_frag.equal_to[frag1] != NULL || heapinfo2[block2].busy_frag.equal_to[frag2] != NULL){
 651         if(equal_fragments(block1, frag1, block2, frag2)){
 652           if(match_pairs){
 653             match_equals(previous);
 654             xbt_dynar_free(&previous);
 655           }
 656           return 0;
 657         }else{
 658           if(match_pairs){
 659             xbt_dynar_free(&previous);
 660           }
 661           return 1;
 662         }
 663       }
 664
 665       if(heapinfo1[block1].busy_frag.frag_size[frag1] != heapinfo2[block2].busy_frag.frag_size[frag2]){
 666         if(match_pairs){
 667           xbt_dynar_free(&previous);
 668         }
 669         return 2;
 670       }
 671
 672       if(!add_heap_area_pair(previous, block1, frag1, block2, frag2)){
 673         if(match_pairs){
 674           match_equals(previous);
 675           xbt_dynar_free(&previous);
 676         }
 677         return 0;
 678       }
 679
 680       size = heapinfo1[block1].busy_frag.frag_size[frag1];
 681
 682       if(size <= 0){
 683         if(match_pairs){
 684           match_equals(previous);
 685           xbt_dynar_free(&previous);
 686         }
 687         return 0;
 688       }
 689
 690       if(heapinfo1[block1].busy_frag.ignore[frag1] == 1 && heapinfo2[block2].busy_frag.ignore[frag2] == 1)
 691         check_ignore = 1;
 692
 693     }
 694
 695   }else if((heapinfo1[block1].type > 0) && (heapinfo2[block2].type > 0)){
 696
 697     frag1 = ((uintptr_t) (ADDR2UINT (area1) % (BLOCKSIZE))) >> heapinfo1[block1].type;
 698     frag2 = ((uintptr_t) (ADDR2UINT (area2) % (BLOCKSIZE))) >> heapinfo2[block2].type;
 699
 700     if(heapinfo1[block1].busy_frag.equal_to[frag1] != NULL || heapinfo2[block2].busy_frag.equal_to[frag2] != NULL){
 701       if(equal_fragments(block1, frag1, block2, frag2)){
 702         if(match_pairs){
 703           match_equals(previous);
 704           xbt_dynar_free(&previous);
 705         }
 706         return 0;
 707       }else{
 708         if(match_pairs){
 709           xbt_dynar_free(&previous);
 710         }
 711         return 1;
 712       }
 713     }
 714
 715     if(heapinfo1[block1].busy_frag.frag_size[frag1] != heapinfo2[block2].busy_frag.frag_size[frag2]){
 716       if(match_pairs){
 717         xbt_dynar_free(&previous);
 718       }
 719       return 2;
 720     }
 721
 722     if(!add_heap_area_pair(previous, block1, frag1, block2, frag2)){
 723       if(match_pairs){
 724         match_equals(previous);
 725         xbt_dynar_free(&previous);
 726       }
 727       return 0;
 728     }
 729
 730     addr_frag1 = (void*) ((char *)addr_block1 + (frag1 << heapinfo1[block1].type));
 731     addr_frag2 = (void*) ((char *)addr_block2 + (frag2 << heapinfo2[block2].type));
 732
 733     area1_to_compare = addr_frag1;
 734     area2_to_compare = addr_frag2;
 735
 736     size = heapinfo1[block1].busy_frag.frag_size[frag1];
 737
 738     if(size <= 0){
 739       if(match_pairs){
 740         match_equals(previous);
 741         xbt_dynar_free(&previous);
 742       }
 743       return 0;
 744     }
 745
 746     if(heapinfo1[block1].busy_frag.ignore[frag1] == 1 && heapinfo2[block2].busy_frag.ignore[frag2] == 1)
 747       check_ignore = 1;
 748
 749   }else{
 750     if(match_pairs){
 751       xbt_dynar_free(&previous);
 752     }
 753     return 1;
 754   }
 755
 756   while(i<size){
 757
 758     if(check_ignore){
 759       if((ignore1 = heap_comparison_ignore_size(to_ignore1, (char *)area1 + i)) > 0){
 760         if((ignore2 = heap_comparison_ignore_size(to_ignore2, (char *)area2 + i))  == ignore1){
 761           i = i + ignore2;
 762           continue;
 763         }
 764       }
 765     }
 766
 767     pointer_align = (i / sizeof(void*)) * sizeof(void*);
 768     addr_pointed1 = *((void **)((char *)area1_to_compare + pointer_align));
 769     addr_pointed2 = *((void **)((char *)area2_to_compare + pointer_align));
 770
 771     if(addr_pointed1 > maestro_stack_start && addr_pointed1 < maestro_stack_end && addr_pointed2 > maestro_stack_start && addr_pointed2 < maestro_stack_end){
 772       i = pointer_align + sizeof(void *);
 773       continue;
 774     }else if((addr_pointed1 > s_heap) && ((char *)addr_pointed1 < (char *)s_heap + STD_HEAP_SIZE)
 775            && (addr_pointed2 > s_heap) && ((char *)addr_pointed2 < (char *)s_heap + STD_HEAP_SIZE)){
 776       res_compare = compare_area(addr_pointed1, addr_pointed2, previous);
 777       if(res_compare != 0){
 778         if(match_pairs)
 779           xbt_dynar_free(&previous);
 780         return res_compare;
 781       }
 782     }else{
 783       j=0;
 784       while(j<sizeof(void*) && (i + j) < size){
 785         if(memcmp(((char *)area1_to_compare) + i + j, ((char *)area2_to_compare) + i + j , 1) != 0){
 786           if(match_pairs)
 787             xbt_dynar_free(&previous);
 788           return 1;
 789         }
 790         j++;
 791       }
 792     }
 793
 794     i = pointer_align + sizeof(void *);
 795   }
 796
 797   if(match_pairs){
 798     match_equals(previous);
 799     xbt_dynar_free(&previous);
 800   }
 801
 802   return 0;
 803
 804
 805 }
 806
 807 static void heap_area_pair_free(heap_area_pair_t pair){
 808   xbt_free(pair);
 809   pair = NULL;
 810 }
 811
 812 static void heap_area_pair_free_voidp(void *d)
 813 {
 814   heap_area_pair_free((heap_area_pair_t) * (void **) d);
 815 }
 816
 817 static int add_heap_area_pair(xbt_dynar_t list, int block1, int fragment1, int block2, int fragment2){
 818
 819   if(is_new_heap_area_pair(list, block1, fragment1, block2, fragment2)){
 820     heap_area_pair_t pair = NULL;
 821     pair = xbt_new0(s_heap_area_pair_t, 1);
 822     pair->block1 = block1;
 823     pair->fragment1 = fragment1;
 824     pair->block2 = block2;
 825     pair->fragment2 = fragment2;
 826
 827     xbt_dynar_push(list, &pair);
 828
 829     return 1;
 830   }
 831
 832   return 0;
 833 }
 834
 835 static int is_new_heap_area_pair(xbt_dynar_t list, int block1, int fragment1, int block2, int fragment2){
 836
 837   unsigned int cursor = 0;
 838   heap_area_pair_t current_pair;
 839
 840   xbt_dynar_foreach(list, cursor, current_pair){
 841     if(current_pair->block1 == block1 && current_pair->block2 == block2 && current_pair->fragment1 == fragment1 && current_pair->fragment2 == fragment2)
 842       return 0;
 843   }
 844
 845   return 1;
 846 }
 847
 848
 849 void match_equals(xbt_dynar_t list){
 850
 851   unsigned int cursor = 0;
 852   heap_area_pair_t current_pair;
 853   heap_area_t previous_area;
 854
 855   xbt_dynar_foreach(list, cursor, current_pair){
 856
 857     if(current_pair->fragment1 != -1){
 858
 859       if(heapinfo1[current_pair->block1].busy_frag.equal_to[current_pair->fragment1] != NULL){
 860         previous_area = heapinfo1[current_pair->block1].busy_frag.equal_to[current_pair->fragment1];
 861         xbt_free(heapinfo2[previous_area->block].busy_frag.equal_to[previous_area->fragment]);
 862         heapinfo2[previous_area->block].busy_frag.equal_to[previous_area->fragment] = NULL;
 863         xbt_free(previous_area);
 864       }
 865       if(heapinfo2[current_pair->block2].busy_frag.equal_to[current_pair->fragment2] != NULL){
 866         previous_area = heapinfo2[current_pair->block2].busy_frag.equal_to[current_pair->fragment2];
 867         xbt_free(heapinfo1[previous_area->block].busy_frag.equal_to[previous_area->fragment]);
 868         heapinfo1[previous_area->block].busy_frag.equal_to[previous_area->fragment] = NULL;
 869         xbt_free(previous_area);
 870       }
 871
 872       heapinfo1[current_pair->block1].busy_frag.equal_to[current_pair->fragment1] = new_heap_area(current_pair->block2, current_pair->fragment2);
 873       heapinfo2[current_pair->block2].busy_frag.equal_to[current_pair->fragment2] = new_heap_area(current_pair->block1, current_pair->fragment1);
 874
 875     }else{
 876
 877       if(heapinfo1[current_pair->block1].busy_block.equal_to != NULL){
 878         previous_area = heapinfo1[current_pair->block1].busy_block.equal_to;
 879         xbt_free(heapinfo2[previous_area->block].busy_block.equal_to);
 880         heapinfo2[previous_area->block].busy_block.equal_to = NULL;
 881         xbt_free(previous_area);
 882       }
 883       if(heapinfo2[current_pair->block2].busy_block.equal_to != NULL){
 884         previous_area = heapinfo2[current_pair->block2].busy_block.equal_to;
 885         xbt_free(heapinfo1[previous_area->block].busy_block.equal_to);
 886         heapinfo1[previous_area->block].busy_block.equal_to = NULL;
 887         xbt_free(previous_area);
 888       }
 889
 890       heapinfo1[current_pair->block1].busy_block.equal_to = new_heap_area(current_pair->block2, current_pair->fragment2);
 891       heapinfo2[current_pair->block2].busy_block.equal_to = new_heap_area(current_pair->block1, current_pair->fragment1);
 892
 893     }
 894   }
 895
 896 }
 897
 898 #ifndef max
 899 #define max( a, b ) ( ((a) > (b)) ? (a) : (b) )
 900 #endif
 901
 902 int mmalloc_linear_compare_heap(xbt_mheap_t heap1, xbt_mheap_t heap2){
 903
 904   if(heap1 == NULL && heap1 == NULL){
 905     XBT_DEBUG("Malloc descriptors null");
 906     return 0;
 907   }
 908
 909   if(heap1->heaplimit != heap2->heaplimit){
 910     XBT_DEBUG("Different limit of valid info table indices");
 911     return 1;
 912   }
 913
 914   /* Heap information */
 915   heaplimit = ((struct mdesc *)heap1)->heaplimit;
 916
 917   s_heap = (char *)mmalloc_get_current_heap() - STD_HEAP_SIZE - getpagesize();
 918
 919   heapbase1 = (char *)heap1 + BLOCKSIZE;
 920   heapbase2 = (char *)heap2 + BLOCKSIZE;
 921
 922   heapinfo1 = (malloc_info *)((char *)heap1 + ((uintptr_t)((char *)heap1->heapinfo - (char *)s_heap)));
 923   heapinfo2 = (malloc_info *)((char *)heap2 + ((uintptr_t)((char *)heap2->heapinfo - (char *)s_heap)));
 924
 925   heapsize1 = heap1->heapsize;
 926   heapsize2 = heap2->heapsize;
 927
 928   /* Start comparison */
 929   size_t i, j, k;
 930   void *addr_block1, *addr_block2, *addr_frag1, *addr_frag2;
 931
 932   int distance = 0;
 933
 934   /* Check busy blocks*/
 935
 936   i = 1;
 937
 938   while(i <= heaplimit){
 939
 940     addr_block1 = ((void*) (((ADDR2UINT(i)) - 1) * BLOCKSIZE + (char*)heapbase1));
 941     addr_block2 = ((void*) (((ADDR2UINT(i)) - 1) * BLOCKSIZE + (char*)heapbase2));
 942
 943     if(heapinfo1[i].type != heapinfo2[i].type){
 944
 945       distance += BLOCKSIZE;
 946       XBT_DEBUG("Different type of blocks (%zu) : %d - %d -> distance = %d", i, heapinfo1[i].type, heapinfo2[i].type, distance);
 947       i++;
 948
 949     }else{
 950
 951       if(heapinfo1[i].type == -1){ /* Free block */
 952         i++;
 953         continue;
 954       }
 955
 956       if(heapinfo1[i].type == 0){ /* Large block */
 957
 958         if(heapinfo1[i].busy_block.size != heapinfo2[i].busy_block.size){
 959           distance += BLOCKSIZE * max(heapinfo1[i].busy_block.size, heapinfo2[i].busy_block.size);
 960           i += max(heapinfo1[i].busy_block.size, heapinfo2[i].busy_block.size);
 961           XBT_DEBUG("Different larger of cluster at block %zu : %zu - %zu -> distance = %d", i, heapinfo1[i].busy_block.size, heapinfo2[i].busy_block.size, distance);
 962           continue;
 963         }
 964
 965         /*if(heapinfo1[i].busy_block.busy_size != heapinfo2[i].busy_block.busy_size){
 966           distance += max(heapinfo1[i].busy_block.busy_size, heapinfo2[i].busy_block.busy_size);
 967           i += max(heapinfo1[i].busy_block.size, heapinfo2[i].busy_block.size);
 968           XBT_DEBUG("Different size used oin large cluster at block %zu : %zu - %zu -> distance = %d", i, heapinfo1[i].busy_block.busy_size, heapinfo2[i].busy_block.busy_size, distance);
 969           continue;
 970           }*/
 971
 972         k = 0;
 973
 974         //while(k < (heapinfo1[i].busy_block.busy_size)){
 975         while(k < heapinfo1[i].busy_block.size * BLOCKSIZE){
 976           if(memcmp((char *)addr_block1 + k, (char *)addr_block2 + k, 1) != 0){
 977             distance ++;
 978           }
 979           k++;
 980         }
 981
 982         i++;
 983
 984       }else { /* Fragmented block */
 985
 986         for(j=0; j < (size_t) (BLOCKSIZE >> heapinfo1[i].type); j++){
 987
 988           addr_frag1 = (void*) ((char *)addr_block1 + (j << heapinfo1[i].type));
 989           addr_frag2 = (void*) ((char *)addr_block2 + (j << heapinfo2[i].type));
 990
 991           if(heapinfo1[i].busy_frag.frag_size[j] == 0 && heapinfo2[i].busy_frag.frag_size[j] == 0){
 992             continue;
 993           }
 994
 995
 996           /*if(heapinfo1[i].busy_frag.frag_size[j] != heapinfo2[i].busy_frag.frag_size[j]){
 997             distance += max(heapinfo1[i].busy_frag.frag_size[j], heapinfo2[i].busy_frag.frag_size[j]);
 998             XBT_DEBUG("Different size used in fragment %zu in block %zu : %d - %d -> distance = %d", j, i, heapinfo1[i].busy_frag.frag_size[j], heapinfo2[i].busy_frag.frag_size[j], distance);
 999             continue;
1000             }*/
1001
1002           k=0;
1003
1004           //while(k < max(heapinfo1[i].busy_frag.frag_size[j], heapinfo2[i].busy_frag.frag_size[j])){
1005           while(k < (BLOCKSIZE / (BLOCKSIZE >> heapinfo1[i].type))){
1006             if(memcmp((char *)addr_frag1 + k, (char *)addr_frag2 + k, 1) != 0){
1007               distance ++;
1008             }
1009             k++;
1010           }
1011
1012         }
1013
1014         i++;
1015
1016       }
1017
1018     }
1019
1020   }
1021
1022   return distance;
1023
1024 }
1025
1026 static int is_stack(void *address){
1027   unsigned int cursor = 0;
1028   stack_region_t stack;
1029
1030   xbt_dynar_foreach(stacks_areas, cursor, stack){
1031     if(address == stack->address)
1032       return 1;
1033   }
1034
1035   return 0;
1036 }
1037
1038 static int is_block_stack(int block){
1039   unsigned int cursor = 0;
1040   stack_region_t stack;
1041
1042   xbt_dynar_foreach(stacks_areas, cursor, stack){
1043     if(block == stack->block)
1044       return 1;
1045   }
1046
1047   return 0;
1048 }
1049
1050 static void add_heap_equality(xbt_dynar_t equals, void *a1, void *a2){
1051
1052   if(xbt_dynar_is_empty(equals)){
1053
1054     heap_equality_t he = xbt_new0(s_heap_equality_t, 1);
1055     he->address1 = a1;
1056     he->address2 = a2;
1057
1058     xbt_dynar_insert_at(equals, 0, &he);
1059
1060   }else{
1061
1062     unsigned int cursor = 0;
1063     int start = 0;
1064     int end = xbt_dynar_length(equals) - 1;
1065     heap_equality_t current_equality = NULL;
1066
1067     while(start <= end){
1068       cursor = (start + end) / 2;
1069       current_equality = (heap_equality_t)xbt_dynar_get_as(equals, cursor, heap_equality_t);
1070       if(current_equality->address1 == a1){
1071         if(current_equality->address2 == a2)
1072           return;
1073         if(current_equality->address2 < a2)
1074           start = cursor + 1;
1075         if(current_equality->address2 > a2)
1076           end = cursor - 1;
1077       }
1078       if(current_equality->address1 < a1)
1079         start = cursor + 1;
1080       if(current_equality->address1 > a1)
1081         end = cursor - 1;
1082     }
1083
1084     heap_equality_t he = xbt_new0(s_heap_equality_t, 1);
1085     he->address1 = a1;
1086     he->address2 = a2;
1087
1088     if(current_equality->address1 < a1)
1089       xbt_dynar_insert_at(equals, cursor + 1 , &he);
1090     else
1091        xbt_dynar_insert_at(equals, cursor, &he);
1092
1093   }
1094
1095 }
1096
1097 static void remove_heap_equality(xbt_dynar_t equals, int address, void *a){
1098
1099   unsigned int cursor = 0;
1100   heap_equality_t current_equality;
1101   int found = 0;
1102
1103   if(address == 1){
1104
1105     int start = 0;
1106     int end = xbt_dynar_length(equals) - 1;
1107
1108
1109     while(start <= end && found == 0){
1110       cursor = (start + end) / 2;
1111       current_equality = (heap_equality_t)xbt_dynar_get_as(equals, cursor, heap_equality_t);
1112       if(current_equality->address1 == a)
1113         found = 1;
1114       if(current_equality->address1 < a)
1115         start = cursor + 1;
1116       if(current_equality->address1 > a)
1117         end = cursor - 1;
1118     }
1119
1120     if(found == 1)
1121       xbt_dynar_remove_at(equals, cursor, NULL);
1122
1123   }else{
1124
1125     xbt_dynar_foreach(equals, cursor, current_equality){
1126       if(current_equality->address2 == a){
1127         found = 1;
1128         break;
1129       }
1130     }
1131
1132     if(found == 1)
1133       xbt_dynar_remove_at(equals, cursor, NULL);
1134
1135   }
1136
1137 }
1138
1139 int is_free_area(void *area, xbt_mheap_t heap){
1140
1141   void *sheap = (char *)mmalloc_get_current_heap() - STD_HEAP_SIZE - getpagesize();
1142   malloc_info *heapinfo = (malloc_info *)((char *)heap + ((uintptr_t)((char *)heap->heapinfo - (char *)sheap)));
1143   size_t heapsize = heap->heapsize;
1144
1145   /* Get block number */
1146   size_t block = ((char*)area - (char*)((xbt_mheap_t)sheap)->heapbase) / BLOCKSIZE + 1;
1147   size_t fragment;
1148
1149   /* Check if valid block number */
1150   if((char *)area < (char*)((xbt_mheap_t)sheap)->heapbase || block > heapsize || block < 1)
1151     return 0;
1152
1153   if(heapinfo[block].type < 0)
1154     return 1;
1155
1156   if(heapinfo[block].type == 0)
1157     return 0;
1158
1159   if(heapinfo[block].type > 0){
1160     fragment = ((uintptr_t) (ADDR2UINT(area) % (BLOCKSIZE))) >> heapinfo[block].type;
1161     if(heapinfo[block].busy_frag.frag_size[fragment] == 0)
1162       return 1;
1163   }
1164
1165   return 0;
1166
1167 }
1168
1169 static int equal_blocks(int b1, int b2){
1170   if(heapinfo1[b1].busy_block.equal_to != NULL){
1171     if(heapinfo2[b2].busy_block.equal_to != NULL){
1172       if(((heap_area_t)(heapinfo1[b1].busy_block.equal_to))->block == b2 && ((heap_area_t)(heapinfo2[b2].busy_block.equal_to))->block == b1)
1173         return 1;
1174     }
1175   }
1176   return 0;
1177 }
1178
1179 static int equal_fragments(int b1, int f1, int b2, int f2){
1180   if(heapinfo1[b1].busy_frag.equal_to[f1] != NULL){
1181     if(heapinfo2[b2].busy_frag.equal_to[f2] != NULL){
1182       if(((heap_area_t)(heapinfo1[b1].busy_frag.equal_to[f1]))->block == b2 && ((heap_area_t)(heapinfo2[b2].busy_frag.equal_to[f2]))->block == b1 && ((heap_area_t)(heapinfo1[b1].busy_frag.equal_to[f1]))->fragment == f2 && ((heap_area_t)(heapinfo2[b2].busy_frag.equal_to[f2]))->fragment == f1)
1183         return 1;
1184     }
1185   }
1186   return 0;
1187 }