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   size_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       if(heapinfo1[block1].busy_block.size != heapinfo2[block2].busy_block.size){
 599         if(match_pairs){
 600           xbt_dynar_free(&previous);
 601         }
 602         return 1;
 603       }
 604       if(heapinfo1[block1].busy_block.busy_size != heapinfo2[block2].busy_block.busy_size){
 605         if(match_pairs){
 606           xbt_dynar_free(&previous);
 607         }
 608         return 2;
 609       }
 610       if(!add_heap_area_pair(previous, block1, -1, block2, -1)){
 611         if(match_pairs){
 612           match_equals(previous);
 613           xbt_dynar_free(&previous);
 614         }
 615         return 0;
 616       }
 617
 618       size = heapinfo1[block1].busy_block.busy_size;
 619       frag1 = -1;
 620       frag2 = -1;
 621
 622       area1_to_compare = addr_block1;
 623       area2_to_compare = addr_block2;
 624
 625       if(heapinfo1[block1].busy_block.ignore == 1 || heapinfo2[block2].busy_block.ignore == 1)
 626         check_ignore = 1;
 627
 628     }else{
 629       frag1 = ((uintptr_t) (ADDR2UINT (area1) % (BLOCKSIZE))) >> heapinfo1[block1].type;
 630       frag2 = ((uintptr_t) (ADDR2UINT (area2) % (BLOCKSIZE))) >> heapinfo2[block2].type;
 631
 632       addr_frag1 = (void*) ((char *)addr_block1 + (frag1 << heapinfo1[block1].type));
 633       addr_frag2 = (void*) ((char *)addr_block2 + (frag2 << heapinfo2[block2].type));
 634
 635       area1_to_compare = addr_frag1;
 636       area2_to_compare = addr_frag2;
 637
 638       if(heapinfo1[block1].busy_frag.equal_to[frag1] != NULL || heapinfo2[block2].busy_frag.equal_to[frag2] != NULL){
 639         if(equal_fragments(block1, frag1, block2, frag2)){
 640           if(match_pairs){
 641             match_equals(previous);
 642             xbt_dynar_free(&previous);
 643           }
 644           return 0;
 645         }else{
 646           if(match_pairs){
 647             xbt_dynar_free(&previous);
 648           }
 649           return 1;
 650         }
 651       }
 652
 653       if(heapinfo1[block1].busy_frag.frag_size[frag1] != heapinfo2[block2].busy_frag.frag_size[frag2]){
 654         if(match_pairs){
 655           xbt_dynar_free(&previous);
 656         }
 657         return 2;
 658       }
 659
 660       if(!add_heap_area_pair(previous, block1, frag1, block2, frag2)){
 661         if(match_pairs){
 662           match_equals(previous);
 663           xbt_dynar_free(&previous);
 664         }
 665         return 0;
 666       }
 667
 668       size = heapinfo1[block1].busy_frag.frag_size[frag1];
 669
 670       if(size == -1){
 671         if(match_pairs){
 672           match_equals(previous);
 673           xbt_dynar_free(&previous);
 674         }
 675         return 0;
 676       }
 677
 678       if(heapinfo1[block1].busy_frag.ignore[frag1] == 1 || heapinfo2[block2].busy_frag.ignore[frag2] == 1)
 679         check_ignore = 1;
 680
 681     }
 682   }else if((heapinfo1[block1].type > 0) && (heapinfo2[block2].type > 0)){
 683
 684     frag1 = ((uintptr_t) (ADDR2UINT (area1) % (BLOCKSIZE))) >> heapinfo1[block1].type;
 685     frag2 = ((uintptr_t) (ADDR2UINT (area2) % (BLOCKSIZE))) >> heapinfo2[block2].type;
 686
 687     if(heapinfo1[block1].busy_frag.equal_to[frag1] != NULL || heapinfo2[block2].busy_frag.equal_to[frag2] != NULL){
 688       if(equal_fragments(block1, frag1, block2, frag2)){
 689         if(match_pairs){
 690           match_equals(previous);
 691           xbt_dynar_free(&previous);
 692         }
 693         return 0;
 694       }else{
 695         if(match_pairs){
 696           xbt_dynar_free(&previous);
 697         }
 698         return 1;
 699       }
 700     }
 701
 702     if(heapinfo1[block1].busy_frag.frag_size[frag1] != heapinfo2[block2].busy_frag.frag_size[frag2]){
 703       if(match_pairs){
 704         xbt_dynar_free(&previous);
 705       }
 706       return 2;
 707     }
 708
 709     if(!add_heap_area_pair(previous, block1, frag1, block2, frag2)){
 710       if(match_pairs){
 711         match_equals(previous);
 712         xbt_dynar_free(&previous);
 713       }
 714       return 0;
 715     }
 716
 717     addr_frag1 = (void*) ((char *)addr_block1 + (frag1 << heapinfo1[block1].type));
 718     addr_frag2 = (void*) ((char *)addr_block2 + (frag2 << heapinfo2[block2].type));
 719
 720     area1_to_compare = addr_frag1;
 721     area2_to_compare = addr_frag2;
 722
 723     size = heapinfo1[block1].busy_frag.frag_size[frag1];
 724
 725     if(size == -1){
 726       if(match_pairs){
 727         xbt_dynar_free(&previous);
 728       }
 729       return 0;
 730     }
 731
 732     if(heapinfo1[block1].busy_frag.ignore[frag1] == 1 || heapinfo2[block2].busy_frag.ignore[frag2] == 1)
 733       check_ignore = 1;
 734
 735   }else{
 736     if(match_pairs){
 737       xbt_dynar_free(&previous);
 738     }
 739     return 1;
 740   }
 741
 742   while(i<size){
 743
 744     if(check_ignore){
 745       if((ignore1 = heap_comparison_ignore_size(to_ignore1, (char *)area1 + i)) > 0){
 746         if((ignore2 = heap_comparison_ignore_size(to_ignore2, (char *)area2 + i))  == ignore1){
 747           i = i + ignore2;
 748           continue;
 749         }
 750       }
 751     }
 752
 753     pointer_align = (i / sizeof(void*)) * sizeof(void*);
 754     addr_pointed1 = *((void **)((char *)area1_to_compare + pointer_align));
 755     addr_pointed2 = *((void **)((char *)area2_to_compare + pointer_align));
 756
 757     if(addr_pointed1 > maestro_stack_start && addr_pointed1 < maestro_stack_end && addr_pointed2 > maestro_stack_start && addr_pointed2 < maestro_stack_end){
 758       i = pointer_align + sizeof(void *);
 759       continue;
 760     }else if((addr_pointed1 > s_heap) && ((char *)addr_pointed1 < (char *)s_heap + STD_HEAP_SIZE)
 761            && (addr_pointed2 > s_heap) && ((char *)addr_pointed2 < (char *)s_heap + STD_HEAP_SIZE)){
 762       res_compare = compare_area(addr_pointed1, addr_pointed2, previous);
 763       if(res_compare != 0)
 764         return res_compare;
 765     }else{
 766       j=0;
 767       while(j<sizeof(void*) && (i + j) < size){
 768         if(memcmp(((char *)area1_to_compare) + i + j, ((char *)area2_to_compare) + i + j , 1) != 0)
 769           return 1;
 770         j++;
 771       }
 772     }
 773
 774     i = pointer_align + sizeof(void *);
 775   }
 776
 777   if(match_pairs){
 778     match_equals(previous);
 779   }
 780
 781   return 0;
 782
 783
 784 }
 785
 786 static void heap_area_pair_free(heap_area_pair_t pair){
 787   xbt_free(pair);
 788   pair = NULL;
 789 }
 790
 791 static void heap_area_pair_free_voidp(void *d)
 792 {
 793   heap_area_pair_free((heap_area_pair_t) * (void **) d);
 794 }
 795
 796 static int add_heap_area_pair(xbt_dynar_t list, int block1, int fragment1, int block2, int fragment2){
 797
 798   if(is_new_heap_area_pair(list, block1, fragment1, block2, fragment2)){
 799     heap_area_pair_t pair = NULL;
 800     pair = xbt_new0(s_heap_area_pair_t, 1);
 801     pair->block1 = block1;
 802     pair->fragment1 = fragment1;
 803     pair->block2 = block2;
 804     pair->fragment2 = fragment2;
 805
 806     xbt_dynar_push(list, &pair);
 807
 808     return 1;
 809   }
 810
 811   return 0;
 812 }
 813
 814 static int is_new_heap_area_pair(xbt_dynar_t list, int block1, int fragment1, int block2, int fragment2){
 815
 816   unsigned int cursor = 0;
 817   heap_area_pair_t current_pair;
 818
 819   xbt_dynar_foreach(list, cursor, current_pair){
 820     if(current_pair->block1 == block1 && current_pair->block2 == block2 && current_pair->fragment1 == fragment1 && current_pair->fragment2 == fragment2)
 821       return 0;
 822   }
 823
 824   return 1;
 825 }
 826
 827
 828 void match_equals(xbt_dynar_t list){
 829
 830   unsigned int cursor = 0;
 831   heap_area_pair_t current_pair;
 832   heap_area_t previous_area;
 833
 834   xbt_dynar_foreach(list, cursor, current_pair){
 835
 836     if(current_pair->fragment1 != -1){
 837
 838       if(heapinfo1[current_pair->block1].busy_frag.equal_to[current_pair->fragment1] != NULL){
 839         previous_area = heapinfo1[current_pair->block1].busy_frag.equal_to[current_pair->fragment1];
 840         xbt_free(heapinfo2[previous_area->block].busy_frag.equal_to[previous_area->fragment]);
 841         heapinfo2[previous_area->block].busy_frag.equal_to[previous_area->fragment] = NULL;
 842         xbt_free(previous_area);
 843       }
 844       if(heapinfo2[current_pair->block2].busy_frag.equal_to[current_pair->fragment2] != NULL){
 845         previous_area = heapinfo2[current_pair->block2].busy_frag.equal_to[current_pair->fragment2];
 846         xbt_free(heapinfo1[previous_area->block].busy_frag.equal_to[previous_area->fragment]);
 847         heapinfo1[previous_area->block].busy_frag.equal_to[previous_area->fragment] = NULL;
 848         xbt_free(previous_area);
 849       }
 850
 851       heapinfo1[current_pair->block1].busy_frag.equal_to[current_pair->fragment1] = new_heap_area(current_pair->block2, current_pair->fragment2);
 852       heapinfo2[current_pair->block2].busy_frag.equal_to[current_pair->fragment2] = new_heap_area(current_pair->block1, current_pair->fragment1);
 853
 854     }else{
 855
 856       if(heapinfo1[current_pair->block1].busy_block.equal_to != NULL){
 857         previous_area = heapinfo1[current_pair->block1].busy_block.equal_to;
 858         xbt_free(heapinfo2[previous_area->block].busy_block.equal_to);
 859         heapinfo2[previous_area->block].busy_block.equal_to = NULL;
 860         xbt_free(previous_area);
 861       }
 862       if(heapinfo2[current_pair->block2].busy_block.equal_to != NULL){
 863         previous_area = heapinfo2[current_pair->block2].busy_block.equal_to;
 864         xbt_free(heapinfo1[previous_area->block].busy_block.equal_to);
 865         heapinfo1[previous_area->block].busy_block.equal_to = NULL;
 866         xbt_free(previous_area);
 867       }
 868
 869       heapinfo1[current_pair->block1].busy_block.equal_to = new_heap_area(current_pair->block2, current_pair->fragment2);
 870       heapinfo2[current_pair->block2].busy_block.equal_to = new_heap_area(current_pair->block1, current_pair->fragment1);
 871
 872     }
 873   }
 874
 875 }
 876
 877 #ifndef max
 878 #define max( a, b ) ( ((a) > (b)) ? (a) : (b) )
 879 #endif
 880
 881 int mmalloc_linear_compare_heap(xbt_mheap_t heap1, xbt_mheap_t heap2){
 882
 883   if(heap1 == NULL && heap1 == NULL){
 884     XBT_DEBUG("Malloc descriptors null");
 885     return 0;
 886   }
 887
 888   if(heap1->heaplimit != heap2->heaplimit){
 889     XBT_DEBUG("Different limit of valid info table indices");
 890     return 1;
 891   }
 892
 893   /* Heap information */
 894   heaplimit = ((struct mdesc *)heap1)->heaplimit;
 895
 896   s_heap = (char *)mmalloc_get_current_heap() - STD_HEAP_SIZE - getpagesize();
 897
 898   heapbase1 = (char *)heap1 + BLOCKSIZE;
 899   heapbase2 = (char *)heap2 + BLOCKSIZE;
 900
 901   heapinfo1 = (malloc_info *)((char *)heap1 + ((uintptr_t)((char *)heap1->heapinfo - (char *)s_heap)));
 902   heapinfo2 = (malloc_info *)((char *)heap2 + ((uintptr_t)((char *)heap2->heapinfo - (char *)s_heap)));
 903
 904   heapsize1 = heap1->heapsize;
 905   heapsize2 = heap2->heapsize;
 906
 907   /* Start comparison */
 908   size_t i, j, k;
 909   void *addr_block1, *addr_block2, *addr_frag1, *addr_frag2;
 910
 911   int distance = 0;
 912
 913   /* Check busy blocks*/
 914
 915   i = 1;
 916
 917   while(i <= heaplimit){
 918
 919     addr_block1 = ((void*) (((ADDR2UINT(i)) - 1) * BLOCKSIZE + (char*)heapbase1));
 920     addr_block2 = ((void*) (((ADDR2UINT(i)) - 1) * BLOCKSIZE + (char*)heapbase2));
 921
 922     if(heapinfo1[i].type != heapinfo2[i].type){
 923
 924       distance += BLOCKSIZE;
 925       XBT_DEBUG("Different type of blocks (%zu) : %d - %d -> distance = %d", i, heapinfo1[i].type, heapinfo2[i].type, distance);
 926       i++;
 927
 928     }else{
 929
 930       if(heapinfo1[i].type == -1){ /* Free block */
 931         i++;
 932         continue;
 933       }
 934
 935       if(heapinfo1[i].type == 0){ /* Large block */
 936
 937         if(heapinfo1[i].busy_block.size != heapinfo2[i].busy_block.size){
 938           distance += BLOCKSIZE * max(heapinfo1[i].busy_block.size, heapinfo2[i].busy_block.size);
 939           i += max(heapinfo1[i].busy_block.size, heapinfo2[i].busy_block.size);
 940           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);
 941           continue;
 942         }
 943
 944         /*if(heapinfo1[i].busy_block.busy_size != heapinfo2[i].busy_block.busy_size){
 945           distance += max(heapinfo1[i].busy_block.busy_size, heapinfo2[i].busy_block.busy_size);
 946           i += max(heapinfo1[i].busy_block.size, heapinfo2[i].busy_block.size);
 947           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);
 948           continue;
 949           }*/
 950
 951         k = 0;
 952
 953         //while(k < (heapinfo1[i].busy_block.busy_size)){
 954         while(k < heapinfo1[i].busy_block.size * BLOCKSIZE){
 955           if(memcmp((char *)addr_block1 + k, (char *)addr_block2 + k, 1) != 0){
 956             distance ++;
 957           }
 958           k++;
 959         }
 960
 961         i++;
 962
 963       }else { /* Fragmented block */
 964
 965         for(j=0; j < (size_t) (BLOCKSIZE >> heapinfo1[i].type); j++){
 966
 967           addr_frag1 = (void*) ((char *)addr_block1 + (j << heapinfo1[i].type));
 968           addr_frag2 = (void*) ((char *)addr_block2 + (j << heapinfo2[i].type));
 969
 970           if(heapinfo1[i].busy_frag.frag_size[j] == 0 && heapinfo2[i].busy_frag.frag_size[j] == 0){
 971             continue;
 972           }
 973
 974
 975           /*if(heapinfo1[i].busy_frag.frag_size[j] != heapinfo2[i].busy_frag.frag_size[j]){
 976             distance += max(heapinfo1[i].busy_frag.frag_size[j], heapinfo2[i].busy_frag.frag_size[j]);
 977             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);
 978             continue;
 979             }*/
 980
 981           k=0;
 982
 983           //while(k < max(heapinfo1[i].busy_frag.frag_size[j], heapinfo2[i].busy_frag.frag_size[j])){
 984           while(k < (BLOCKSIZE / (BLOCKSIZE >> heapinfo1[i].type))){
 985             if(memcmp((char *)addr_frag1 + k, (char *)addr_frag2 + k, 1) != 0){
 986               distance ++;
 987             }
 988             k++;
 989           }
 990
 991         }
 992
 993         i++;
 994
 995       }
 996
 997     }
 998
 999   }
1000
1001   return distance;
1002
1003 }
1004
1005 static int is_stack(void *address){
1006   unsigned int cursor = 0;
1007   stack_region_t stack;
1008
1009   xbt_dynar_foreach(stacks_areas, cursor, stack){
1010     if(address == stack->address)
1011       return 1;
1012   }
1013
1014   return 0;
1015 }
1016
1017 static int is_block_stack(int block){
1018   unsigned int cursor = 0;
1019   stack_region_t stack;
1020
1021   xbt_dynar_foreach(stacks_areas, cursor, stack){
1022     if(block == stack->block)
1023       return 1;
1024   }
1025
1026   return 0;
1027 }
1028
1029 static void add_heap_equality(xbt_dynar_t equals, void *a1, void *a2){
1030
1031   if(xbt_dynar_is_empty(equals)){
1032
1033     heap_equality_t he = xbt_new0(s_heap_equality_t, 1);
1034     he->address1 = a1;
1035     he->address2 = a2;
1036
1037     xbt_dynar_insert_at(equals, 0, &he);
1038
1039   }else{
1040
1041     unsigned int cursor = 0;
1042     int start = 0;
1043     int end = xbt_dynar_length(equals) - 1;
1044     heap_equality_t current_equality = NULL;
1045
1046     while(start <= end){
1047       cursor = (start + end) / 2;
1048       current_equality = (heap_equality_t)xbt_dynar_get_as(equals, cursor, heap_equality_t);
1049       if(current_equality->address1 == a1){
1050         if(current_equality->address2 == a2)
1051           return;
1052         if(current_equality->address2 < a2)
1053           start = cursor + 1;
1054         if(current_equality->address2 > a2)
1055           end = cursor - 1;
1056       }
1057       if(current_equality->address1 < a1)
1058         start = cursor + 1;
1059       if(current_equality->address1 > a1)
1060         end = cursor - 1;
1061     }
1062
1063     heap_equality_t he = xbt_new0(s_heap_equality_t, 1);
1064     he->address1 = a1;
1065     he->address2 = a2;
1066
1067     if(current_equality->address1 < a1)
1068       xbt_dynar_insert_at(equals, cursor + 1 , &he);
1069     else
1070        xbt_dynar_insert_at(equals, cursor, &he);
1071
1072   }
1073
1074 }
1075
1076 static void remove_heap_equality(xbt_dynar_t equals, int address, void *a){
1077
1078   unsigned int cursor = 0;
1079   heap_equality_t current_equality;
1080   int found = 0;
1081
1082   if(address == 1){
1083
1084     int start = 0;
1085     int end = xbt_dynar_length(equals) - 1;
1086
1087
1088     while(start <= end && found == 0){
1089       cursor = (start + end) / 2;
1090       current_equality = (heap_equality_t)xbt_dynar_get_as(equals, cursor, heap_equality_t);
1091       if(current_equality->address1 == a)
1092         found = 1;
1093       if(current_equality->address1 < a)
1094         start = cursor + 1;
1095       if(current_equality->address1 > a)
1096         end = cursor - 1;
1097     }
1098
1099     if(found == 1)
1100       xbt_dynar_remove_at(equals, cursor, NULL);
1101
1102   }else{
1103
1104     xbt_dynar_foreach(equals, cursor, current_equality){
1105       if(current_equality->address2 == a){
1106         found = 1;
1107         break;
1108       }
1109     }
1110
1111     if(found == 1)
1112       xbt_dynar_remove_at(equals, cursor, NULL);
1113
1114   }
1115
1116 }
1117
1118 int is_free_area(void *area, xbt_mheap_t heap){
1119
1120   void *sheap = (char *)mmalloc_get_current_heap() - STD_HEAP_SIZE - getpagesize();
1121   malloc_info *heapinfo = (malloc_info *)((char *)heap + ((uintptr_t)((char *)heap->heapinfo - (char *)sheap)));
1122   size_t heapsize = heap->heapsize;
1123
1124   /* Get block number */
1125   size_t block = ((char*)area - (char*)((xbt_mheap_t)sheap)->heapbase) / BLOCKSIZE + 1;
1126   size_t fragment;
1127
1128   /* Check if valid block number */
1129   if((char *)area < (char*)((xbt_mheap_t)sheap)->heapbase || block > heapsize || block < 1)
1130     return 0;
1131
1132   if(heapinfo[block].type < 0)
1133     return 1;
1134
1135   if(heapinfo[block].type == 0)
1136     return 0;
1137
1138   if(heapinfo[block].type > 0){
1139     fragment = ((uintptr_t) (ADDR2UINT(area) % (BLOCKSIZE))) >> heapinfo[block].type;
1140     if(heapinfo[block].busy_frag.frag_size[fragment] == 0)
1141       return 1;
1142   }
1143
1144   return 0;
1145
1146 }
1147
1148 static int equal_blocks(int b1, int b2){
1149   if(heapinfo1[b1].busy_block.equal_to != NULL){
1150     if(heapinfo2[b2].busy_block.equal_to != NULL){
1151       if(((heap_area_t)(heapinfo1[b1].busy_block.equal_to))->block == b2 && ((heap_area_t)(heapinfo2[b2].busy_block.equal_to))->block == b1)
1152         return 1;
1153     }
1154   }
1155   return 0;
1156 }
1157
1158 static int equal_fragments(int b1, int f1, int b2, int f2){
1159   if(heapinfo1[b1].busy_frag.equal_to[f1] != NULL){
1160     if(heapinfo2[b2].busy_frag.equal_to[f2] != NULL){
1161       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)
1162         return 1;
1163     }
1164   }
1165   return 0;
1166 }