summaryrefslogtreecommitdiff
path: root/src/base/ftdbgmem.c
blob: 12fed04bb9490d6842060b33a5c9b1c85d7e2832 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
/***************************************************************************/
/*                                                                         */
/*  ftdbgmem.c                                                             */
/*                                                                         */
/*    Memory debugger (body).                                              */
/*                                                                         */
/*  Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2009 by                  */
/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
/*                                                                         */
/*  This file is part of the FreeType project, and may only be used,       */
/*  modified, and distributed under the terms of the FreeType project      */
/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
/*  this file you indicate that you have read the license and              */
/*  understand and accept it fully.                                        */
/*                                                                         */
/***************************************************************************/


#include <ft2build.h>
#include FT_CONFIG_CONFIG_H
#include FT_INTERNAL_DEBUG_H
#include FT_INTERNAL_MEMORY_H
#include FT_SYSTEM_H
#include FT_ERRORS_H
#include FT_TYPES_H


#ifdef FT_DEBUG_MEMORY

#define  KEEPALIVE /* `Keep alive' means that freed blocks aren't released
                    * to the heap.  This is useful to detect double-frees
                    * or weird heap corruption, but it uses large amounts of
                    * memory, however.
                    */

#include FT_CONFIG_STANDARD_LIBRARY_H

  FT_BASE_DEF( const char* )  _ft_debug_file   = 0;
  FT_BASE_DEF( long )         _ft_debug_lineno = 0;

  extern void
  FT_DumpMemory( FT_Memory  memory );


  typedef struct FT_MemSourceRec_*  FT_MemSource;
  typedef struct FT_MemNodeRec_*    FT_MemNode;
  typedef struct FT_MemTableRec_*   FT_MemTable;


#define FT_MEM_VAL( addr )  ((FT_PtrDist)(FT_Pointer)( addr ))

  /*
   *  This structure holds statistics for a single allocation/release
   *  site.  This is useful to know where memory operations happen the
   *  most.
   */
  typedef struct  FT_MemSourceRec_
  {
    const char*   file_name;
    long          line_no;

    FT_Long       cur_blocks;   /* current number of allocated blocks */
    FT_Long       max_blocks;   /* max. number of allocated blocks    */
    FT_Long       all_blocks;   /* total number of blocks allocated   */

    FT_Long       cur_size;     /* current cumulative allocated size */
    FT_Long       max_size;     /* maximum cumulative allocated size */
    FT_Long       all_size;     /* total cumulative allocated size   */

    FT_Long       cur_max;      /* current maximum allocated size */

    FT_UInt32     hash;
    FT_MemSource  link;

  } FT_MemSourceRec;


  /*
   *  We don't need a resizable array for the memory sources, because
   *  their number is pretty limited within FreeType.
   */
#define FT_MEM_SOURCE_BUCKETS  128

  /*
   *  This structure holds information related to a single allocated
   *  memory block.  If KEEPALIVE is defined, blocks that are freed by
   *  FreeType are never released to the system.  Instead, their `size'
   *  field is set to -size.  This is mainly useful to detect double frees,
   *  at the price of large memory footprint during execution.
   */
  typedef struct  FT_MemNodeRec_
  {
    FT_Byte*      address;
    FT_Long       size;     /* < 0 if the block was freed */

    FT_MemSource  source;

#ifdef KEEPALIVE
    const char*   free_file_name;
    FT_Long       free_line_no;
#endif

    FT_MemNode    link;

  } FT_MemNodeRec;


  /*
   *  The global structure, containing compound statistics and all hash
   *  tables.
   */
  typedef struct  FT_MemTableRec_
  {
    FT_ULong         size;
    FT_ULong         nodes;
    FT_MemNode*      buckets;

    FT_ULong         alloc_total;
    FT_ULong         alloc_current;
    FT_ULong         alloc_max;
    FT_ULong         alloc_count;

    FT_Bool          bound_total;
    FT_ULong         alloc_total_max;

    FT_Bool          bound_count;
    FT_ULong         alloc_count_max;

    FT_MemSource     sources[FT_MEM_SOURCE_BUCKETS];

    FT_Bool          keep_alive;

    FT_Memory        memory;
    FT_Pointer       memory_user;
    FT_Alloc_Func    alloc;
    FT_Free_Func     free;
    FT_Realloc_Func  realloc;

  } FT_MemTableRec;


#define FT_MEM_SIZE_MIN  7
#define FT_MEM_SIZE_MAX  13845163

#define FT_FILENAME( x )  ((x) ? (x) : "unknown file")


  /*
   *  Prime numbers are ugly to handle.  It would be better to implement
   *  L-Hashing, which is 10% faster and doesn't require divisions.
   */
  static const FT_UInt  ft_mem_primes[] =
  {
    7,
    11,
    19,
    37,
    73,
    109,
    163,
    251,
    367,
    557,
    823,
    1237,
    1861,
    2777,
    4177,
    6247,
    9371,
    14057,
    21089,
    31627,
    47431,
    71143,
    106721,
    160073,
    240101,
    360163,
    540217,
    810343,
    1215497,
    1823231,
    2734867,
    4102283,
    6153409,
    9230113,
    13845163,
  };


  static FT_ULong
  ft_mem_closest_prime( FT_ULong  num )
  {
    FT_UInt  i;


    for ( i = 0;
          i < sizeof ( ft_mem_primes ) / sizeof ( ft_mem_primes[0] ); i++ )
      if ( ft_mem_primes[i] > num )
        return ft_mem_primes[i];

    return FT_MEM_SIZE_MAX;
  }


  extern void
  ft_mem_debug_panic( const char*  fmt,
                      ... )
  {
    va_list  ap;


    printf( "FreeType.Debug: " );

    va_start( ap, fmt );
    vprintf( fmt, ap );
    va_end( ap );

    printf( "\n" );
    exit( EXIT_FAILURE );
  }


  static FT_Pointer
  ft_mem_table_alloc( FT_MemTable  table,
                      FT_Long      size )
  {
    FT_Memory   memory = table->memory;
    FT_Pointer  block;


    memory->user = table->memory_user;
    block = table->alloc( memory, size );
    memory->user = table;

    return block;
  }


  static void
  ft_mem_table_free( FT_MemTable  table,
                     FT_Pointer   block )
  {
    FT_Memory  memory = table->memory;


    memory->user = table->memory_user;
    table->free( memory, block );
    memory->user = table;
  }


  static void
  ft_mem_table_resize( FT_MemTable  table )
  {
    FT_ULong  new_size;


    new_size = ft_mem_closest_prime( table->nodes );
    if ( new_size != table->size )
    {
      FT_MemNode*  new_buckets;
      FT_ULong     i;


      new_buckets = (FT_MemNode *)
                      ft_mem_table_alloc( table,
                                          new_size * sizeof ( FT_MemNode ) );
      if ( new_buckets == NULL )
        return;

      FT_ARRAY_ZERO( new_buckets, new_size );

      for ( i = 0; i < table->size; i++ )
      {
        FT_MemNode  node, next, *pnode;
        FT_PtrDist  hash;


        node = table->buckets[i];
        while ( node )
        {
          next  = node->link;
          hash  = FT_MEM_VAL( node->address ) % new_size;
          pnode = new_buckets + hash;

          node->link = pnode[0];
          pnode[0]   = node;

          node = next;
        }
      }

      if ( table->buckets )
        ft_mem_table_free( table, table->buckets );

      table->buckets = new_buckets;
      table->size    = new_size;
    }
  }


  static FT_MemTable
  ft_mem_table_new( FT_Memory  memory )
  {
    FT_MemTable  table;


    table = (FT_MemTable)memory->alloc( memory, sizeof ( *table ) );
    if ( table == NULL )
      goto Exit;

    FT_ZERO( table );

    table->size  = FT_MEM_SIZE_MIN;
    table->nodes = 0;

    table->memory = memory;

    table->memory_user = memory->user;

    table->alloc   = memory->alloc;
    table->realloc = memory->realloc;
    table->free    = memory->free;

    table->buckets = (FT_MemNode *)
                       memory->alloc( memory,
                                      table->size * sizeof ( FT_MemNode ) );
    if ( table->buckets )
      FT_ARRAY_ZERO( table->buckets, table->size );
    else
    {
      memory->free( memory, table );
      table = NULL;
    }

  Exit:
    return table;
  }


  static void
  ft_mem_table_destroy( FT_MemTable  table )
  {
    FT_ULong  i;


    FT_DumpMemory( table->memory );

    if ( table )
    {
      FT_Long   leak_count = 0;
      FT_ULong  leaks      = 0;


      /* remove all blocks from the table, revealing leaked ones */
      for ( i = 0; i < table->size; i++ )
      {
        FT_MemNode  *pnode = table->buckets + i, next, node = *pnode;


        while ( node )
        {
          next       = node->link;
          node->link = 0;

          if ( node->size > 0 )
          {
            printf(
              "leaked memory block at address %p, size %8ld in (%s:%ld)\n",
              node->address, node->size,
              FT_FILENAME( node->source->file_name ),
              node->source->line_no );

            leak_count++;
            leaks += node->size;

            ft_mem_table_free( table, node->address );
          }

          node->address = NULL;
          node->size    = 0;

          ft_mem_table_free( table, node );
          node = next;
        }
        table->buckets[i] = 0;
      }

      ft_mem_table_free( table, table->buckets );
      table->buckets = NULL;

      table->size  = 0;
      table->nodes = 0;

      /* remove all sources */
      for ( i = 0; i < FT_MEM_SOURCE_BUCKETS; i++ )
      {
        FT_MemSource  source, next;


        for ( source = table->sources[i]; source != NULL; source = next )
        {
          next = source->link;
          ft_mem_table_free( table, source );
        }

        table->sources[i] = NULL;
      }

      printf(
        "FreeType: total memory allocations = %ld\n", table->alloc_total );
      printf(
        "FreeType: maximum memory footprint = %ld\n", table->alloc_max );

      ft_mem_table_free( table, table );

      if ( leak_count > 0 )
        ft_mem_debug_panic(
          "FreeType: %ld bytes of memory leaked in %ld blocks\n",
          leaks, leak_count );

      printf( "FreeType: no memory leaks detected\n" );
    }
  }


  static FT_MemNode*
  ft_mem_table_get_nodep( FT_MemTable  table,
                          FT_Byte*     address )
  {
    FT_PtrDist   hash;
    FT_MemNode  *pnode, node;


    hash  = FT_MEM_VAL( address );
    pnode = table->buckets + ( hash % table->size );

    for (;;)
    {
      node = pnode[0];
      if ( !node )
        break;

      if ( node->address == address )
        break;

      pnode = &node->link;
    }
    return pnode;
  }


  static FT_MemSource
  ft_mem_table_get_source( FT_MemTable  table )
  {
    FT_UInt32     hash;
    FT_MemSource  node, *pnode;


    /* cast to FT_PtrDist first since void* can be larger */
    /* than FT_UInt32 and GCC 4.1.1 emits a warning       */
    hash  = (FT_UInt32)(FT_PtrDist)(void*)_ft_debug_file +
              (FT_UInt32)( 5 * _ft_debug_lineno );
    pnode = &table->sources[hash % FT_MEM_SOURCE_BUCKETS];

    for ( ;; )
    {
      node = *pnode;
      if ( node == NULL )
        break;

      if ( node->file_name == _ft_debug_file &&
           node->line_no   == _ft_debug_lineno   )
        goto Exit;

      pnode = &node->link;
    }

    node = (FT_MemSource)ft_mem_table_alloc( table, sizeof ( *node ) );
    if ( node == NULL )
      ft_mem_debug_panic(
        "not enough memory to perform memory debugging\n" );

    node->file_name = _ft_debug_file;
    node->line_no   = _ft_debug_lineno;

    node->cur_blocks = 0;
    node->max_blocks = 0;
    node->all_blocks = 0;

    node->cur_size   = 0;
    node->max_size   = 0;
    node->all_size   = 0;

    node->cur_max    = 0;

    node->link = NULL;
    node->hash = hash;
    *pnode     = node;

  Exit:
    return node;
  }


  static void
  ft_mem_table_set( FT_MemTable  table,
                    FT_Byte*     address,
                    FT_ULong     size,
                    FT_Long      delta )
  {
    FT_MemNode  *pnode, node;


    if ( table )
    {
      FT_MemSource  source;


      pnode = ft_mem_table_get_nodep( table, address );
      node  = *pnode;
      if ( node )
      {
        if ( node->size < 0 )
        {
          /* This block was already freed.  Our memory is now completely */
          /* corrupted!                                                  */
          /* This can only happen in keep-alive mode.                    */
          ft_mem_debug_panic(
            "memory heap corrupted (allocating freed block)" );
        }
        else
        {
          /* This block was already allocated.  This means that our memory */
          /* is also corrupted!                                            */
          ft_mem_debug_panic(
            "memory heap corrupted (re-allocating allocated block at"
            " %p, of size %ld)\n"
            "org=%s:%d new=%s:%d\n",
            node->address, node->size,
            FT_FILENAME( node->source->file_name ), node->source->line_no,
            FT_FILENAME( _ft_debug_file ), _ft_debug_lineno );
        }
      }

      /* we need to create a new node in this table */
      node = (FT_MemNode)ft_mem_table_alloc( table, sizeof ( *node ) );
      if ( node == NULL )
        ft_mem_debug_panic( "not enough memory to run memory tests" );

      node->address = address;
      node->size    = size;
      node->source  = source = ft_mem_table_get_source( table );

      if ( delta == 0 )
      {
        /* this is an allocation */
        source->all_blocks++;
        source->cur_blocks++;
        if ( source->cur_blocks > source->max_blocks )
          source->max_blocks = source->cur_blocks;
      }

      if ( size > (FT_ULong)source->cur_max )
        source->cur_max = size;

      if ( delta != 0 )
      {
        /* we are growing or shrinking a reallocated block */
        source->cur_size     += delta;
        table->alloc_current += delta;
      }
      else
      {
        /* we are allocating a new block */
        source->cur_size     += size;
        table->alloc_current += size;
      }

      source->all_size += size;

      if ( source->cur_size > source->max_size )
        source->max_size = source->cur_size;

      node->free_file_name = NULL;
      node->free_line_no   = 0;

      node->link = pnode[0];

      pnode[0] = node;
      table->nodes++;

      table->alloc_total += size;

      if ( table->alloc_current > table->alloc_max )
        table->alloc_max = table->alloc_current;

      if ( table->nodes * 3 < table->size  ||
           table->size  * 3 < table->nodes )
        ft_mem_table_resize( table );
    }
  }


  static void
  ft_mem_table_remove( FT_MemTable  table,
                       FT_Byte*     address,
                       FT_Long      delta )
  {
    if ( table )
    {
      FT_MemNode  *pnode, node;


      pnode = ft_mem_table_get_nodep( table, address );
      node  = *pnode;
      if ( node )
      {
        FT_MemSource  source;


        if ( node->size < 0 )
          ft_mem_debug_panic(
            "freeing memory block at %p more than once at (%s:%ld)\n"
            "block allocated at (%s:%ld) and released at (%s:%ld)",
            address,
            FT_FILENAME( _ft_debug_file ), _ft_debug_lineno,
            FT_FILENAME( node->source->file_name ), node->source->line_no,
            FT_FILENAME( node->free_file_name ), node->free_line_no );

        /* scramble the node's content for additional safety */
        FT_MEM_SET( address, 0xF3, node->size );

        if ( delta == 0 )
        {
          source = node->source;

          source->cur_blocks--;
          source->cur_size -= node->size;

          table->alloc_current -= node->size;
        }

        if ( table->keep_alive )
        {
          /* we simply invert the node's size to indicate that the node */
          /* was freed.                                                 */
          node->size           = -node->size;
          node->free_file_name = _ft_debug_file;
          node->free_line_no   = _ft_debug_lineno;
        }
        else
        {
          table->nodes--;

          *pnode = node->link;

          node->size   = 0;
          node->source = NULL;

          ft_mem_table_free( table, node );

          if ( table->nodes * 3 < table->size  ||
               table->size  * 3 < table->nodes )
            ft_mem_table_resize( table );
        }
      }
      else
        ft_mem_debug_panic(
          "trying to free unknown block at %p in (%s:%ld)\n",
          address,
          FT_FILENAME( _ft_debug_file ), _ft_debug_lineno );
    }
  }


  extern FT_Pointer
  ft_mem_debug_alloc( FT_Memory  memory,
                      FT_Long    size )
  {
    FT_MemTable  table = (FT_MemTable)memory->user;
    FT_Byte*     block;


    if ( size <= 0 )
      ft_mem_debug_panic( "negative block size allocation (%ld)", size );

    /* return NULL if the maximum number of allocations was reached */
    if ( table->bound_count                           &&
         table->alloc_count >= table->alloc_count_max )
      return NULL;

    /* return NULL if this allocation would overflow the maximum heap size */
    if ( table->bound_total                                             &&
         table->alloc_total_max - table->alloc_current > (FT_ULong)size )
      return NULL;

    block = (FT_Byte *)ft_mem_table_alloc( table, size );
    if ( block )
    {
      ft_mem_table_set( table, block, (FT_ULong)size, 0 );

      table->alloc_count++;
    }

    _ft_debug_file   = "<unknown>";
    _ft_debug_lineno = 0;

    return (FT_Pointer)block;
  }


  extern void
  ft_mem_debug_free( FT_Memory   memory,
                     FT_Pointer  block )
  {
    FT_MemTable  table = (FT_MemTable)memory->user;


    if ( block == NULL )
      ft_mem_debug_panic( "trying to free NULL in (%s:%ld)",
                          FT_FILENAME( _ft_debug_file ),
                          _ft_debug_lineno );

    ft_mem_table_remove( table, (FT_Byte*)block, 0 );

    if ( !table->keep_alive )
      ft_mem_table_free( table, block );

    table->alloc_count--;

    _ft_debug_file   = "<unknown>";
    _ft_debug_lineno = 0;
  }


  extern FT_Pointer
  ft_mem_debug_realloc( FT_Memory   memory,
                        FT_Long     cur_size,
                        FT_Long     new_size,
                        FT_Pointer  block )
  {
    FT_MemTable  table = (FT_MemTable)memory->user;
    FT_MemNode   node, *pnode;
    FT_Pointer   new_block;
    FT_Long      delta;

    const char*  file_name = FT_FILENAME( _ft_debug_file );
    FT_Long      line_no   = _ft_debug_lineno;


    /* unlikely, but possible */
    if ( new_size == cur_size )
      return block;

    /* the following is valid according to ANSI C */
#if 0
    if ( block == NULL || cur_size == 0 )
      ft_mem_debug_panic( "trying to reallocate NULL in (%s:%ld)",
                          file_name, line_no );
#endif

    /* while the following is allowed in ANSI C also, we abort since */
    /* such case should be handled by FreeType.                      */
    if ( new_size <= 0 )
      ft_mem_debug_panic(
        "trying to reallocate %p to size 0 (current is %ld) in (%s:%ld)",
        block, cur_size, file_name, line_no );

    /* check `cur_size' value */
    pnode = ft_mem_table_get_nodep( table, (FT_Byte*)block );
    node  = *pnode;
    if ( !node )
      ft_mem_debug_panic(
        "trying to reallocate unknown block at %p in (%s:%ld)",
        block, file_name, line_no );

    if ( node->size <= 0 )
      ft_mem_debug_panic(
        "trying to reallocate freed block at %p in (%s:%ld)",
        block, file_name, line_no );

    if ( node->size != cur_size )
      ft_mem_debug_panic( "invalid ft_realloc request for %p. cur_size is "
                          "%ld instead of %ld in (%s:%ld)",
                          block, cur_size, node->size, file_name, line_no );

    /* return NULL if the maximum number of allocations was reached */
    if ( table->bound_count                           &&
         table->alloc_count >= table->alloc_count_max )
      return NULL;

    delta = (FT_Long)( new_size - cur_size );

    /* return NULL if this allocation would overflow the maximum heap size */
    if ( delta > 0                                                       &&
         table->bound_total                                              &&
         table->alloc_current + (FT_ULong)delta > table->alloc_total_max )
      return NULL;

    new_block = (FT_Byte *)ft_mem_table_alloc( table, new_size );
    if ( new_block == NULL )
      return NULL;

    ft_mem_table_set( table, (FT_Byte*)new_block, new_size, delta );

    ft_memcpy( new_block, block, cur_size < new_size ? cur_size : new_size );

    ft_mem_table_remove( table, (FT_Byte*)block, delta );

    _ft_debug_file   = "<unknown>";
    _ft_debug_lineno = 0;

    if ( !table->keep_alive )
      ft_mem_table_free( table, block );

    return new_block;
  }


  extern FT_Int
  ft_mem_debug_init( FT_Memory  memory )
  {
    FT_MemTable  table;
    FT_Int       result = 0;


    if ( getenv( "FT2_DEBUG_MEMORY" ) )
    {
      table = ft_mem_table_new( memory );
      if ( table )
      {
        const char*  p;


        memory->user    = table;
        memory->alloc   = ft_mem_debug_alloc;
        memory->realloc = ft_mem_debug_realloc;
        memory->free    = ft_mem_debug_free;

        p = getenv( "FT2_ALLOC_TOTAL_MAX" );
        if ( p != NULL )
        {
          FT_Long   total_max = ft_atol( p );


          if ( total_max > 0 )
          {
            table->bound_total     = 1;
            table->alloc_total_max = (FT_ULong)total_max;
          }
        }

        p = getenv( "FT2_ALLOC_COUNT_MAX" );
        if ( p != NULL )
        {
          FT_Long  total_count = ft_atol( p );


          if ( total_count > 0 )
          {
            table->bound_count     = 1;
            table->alloc_count_max = (FT_ULong)total_count;
          }
        }

        p = getenv( "FT2_KEEP_ALIVE" );
        if ( p != NULL )
        {
          FT_Long  keep_alive = ft_atol( p );


          if ( keep_alive > 0 )
            table->keep_alive = 1;
        }

        result = 1;
      }
    }
    return result;
  }


  extern void
  ft_mem_debug_done( FT_Memory  memory )
  {
    FT_MemTable  table = (FT_MemTable)memory->user;


    if ( table )
    {
      memory->free    = table->free;
      memory->realloc = table->realloc;
      memory->alloc   = table->alloc;

      ft_mem_table_destroy( table );
      memory->user = NULL;
    }
  }



  static int
  ft_mem_source_compare( const void*  p1,
                         const void*  p2 )
  {
    FT_MemSource  s1 = *(FT_MemSource*)p1;
    FT_MemSource  s2 = *(FT_MemSource*)p2;


    if ( s2->max_size > s1->max_size )
      return 1;
    else if ( s2->max_size < s1->max_size )
      return -1;
    else
      return 0;
  }


  extern void
  FT_DumpMemory( FT_Memory  memory )
  {
    FT_MemTable  table = (FT_MemTable)memory->user;


    if ( table )
    {
      FT_MemSource*  bucket = table->sources;
      FT_MemSource*  limit  = bucket + FT_MEM_SOURCE_BUCKETS;
      FT_MemSource*  sources;
      FT_UInt        nn, count;
      const char*    fmt;


      count = 0;
      for ( ; bucket < limit; bucket++ )
      {
        FT_MemSource  source = *bucket;


        for ( ; source; source = source->link )
          count++;
      }

      sources = (FT_MemSource*)ft_mem_table_alloc(
                                 table, sizeof ( *sources ) * count );

      count = 0;
      for ( bucket = table->sources; bucket < limit; bucket++ )
      {
        FT_MemSource  source = *bucket;


        for ( ; source; source = source->link )
          sources[count++] = source;
      }

      ft_qsort( sources, count, sizeof ( *sources ), ft_mem_source_compare );

      printf( "FreeType Memory Dump: "
              "current=%ld max=%ld total=%ld count=%ld\n",
              table->alloc_current, table->alloc_max,
              table->alloc_total, table->alloc_count );
      printf( " block  block    sizes    sizes    sizes   source\n" );
      printf( " count   high      sum  highsum      max   location\n" );
      printf( "-------------------------------------------------\n" );

      fmt = "%6ld %6ld %8ld %8ld %8ld %s:%d\n";

      for ( nn = 0; nn < count; nn++ )
      {
        FT_MemSource  source = sources[nn];


        printf( fmt,
                source->cur_blocks, source->max_blocks,
                source->cur_size, source->max_size, source->cur_max,
                FT_FILENAME( source->file_name ),
                source->line_no );
      }
      printf( "------------------------------------------------\n" );

      ft_mem_table_free( table, sources );
    }
  }

#else  /* !FT_DEBUG_MEMORY */

  /* ANSI C doesn't like empty source files */
  typedef int  _debug_mem_dummy;

#endif /* !FT_DEBUG_MEMORY */


/* END */