release/src/router/e2fsprogs/e2fsck/mtrace.h

   1 /* Declarations for `malloc' and friends.
   2    Copyright 1990, 1991, 1992 Free Software Foundation, Inc.
   3                   Written May 1989 by Mike Haertel.
   4
   5 This library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 License, or (at your option) any later version.
   9
  10 This library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with this library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.
  19
  20    The author may be reached (Email) at the address mike@ai.mit.edu,
  21    or (US mail) as Mike Haertel c/o Free Software Foundation.  */
  22
  23 #ifndef _MTRACE_H
  24
  25 #define _MTRACE_H       1
  26
  27 #ifdef  __cplusplus
  28 extern "C"
  29 {
  30 #endif
  31
  32 #if defined (__cplusplus) || (defined (__STDC__) && __STDC__)
  33 #undef  __P
  34 #define __P(args)       args
  35 #undef  __ptr_t
  36 #define __ptr_t         void *
  37 #else /* Not C++ or ANSI C.  */
  38 #undef  __P
  39 #define __P(args)       ()
  40 #undef  const
  41 #define const
  42 #undef  __ptr_t
  43 #define __ptr_t         char *
  44 #endif /* C++ or ANSI C.  */
  45
  46 #ifndef NULL
  47 #define NULL    0
  48 #endif
  49
  50 #ifdef  __STDC__
  51 #include <stddef.h>
  52 #else
  53 #undef  size_t
  54 #define size_t          unsigned int
  55 #undef  ptrdiff_t
  56 #define ptrdiff_t       int
  57 #endif
  58
  59
  60 /* Allocate SIZE bytes of memory.  */
  61 extern __ptr_t malloc __P ((size_t __size));
  62 /* Re-allocate the previously allocated block
  63    in __ptr_t, making the new block SIZE bytes long.  */
  64 extern __ptr_t realloc __P ((__ptr_t __ptr, size_t __size));
  65 /* Allocate NMEMB elements of SIZE bytes each, all initialized to 0.  */
  66 extern __ptr_t calloc __P ((size_t __nmemb, size_t __size));
  67 /* Free a block allocated by `malloc', `realloc' or `calloc'.  */
  68 extern void free __P ((__ptr_t __ptr));
  69
  70 /* Allocate SIZE bytes allocated to ALIGNMENT bytes.  */
  71 extern __ptr_t memalign __P ((size_t __alignment, size_t __size));
  72
  73 /* Allocate SIZE bytes on a page boundary.  */
  74 extern __ptr_t valloc __P ((size_t __size));
  75
  76
  77 #ifdef _MALLOC_INTERNAL
  78
  79 #include <stdio.h>              /* Harmless, gets __GNU_LIBRARY__ defined.  */
  80
  81 #if     defined(__GNU_LIBRARY__) || defined(STDC_HEADERS) || defined(USG)
  82 #include <string.h>
  83 #else
  84 #ifndef memset
  85 #define memset(s, zero, n)      bzero ((s), (n))
  86 #endif
  87 #ifndef memcpy
  88 #define memcpy(d, s, n)         bcopy ((s), (d), (n))
  89 #endif
  90 #endif
  91
  92
  93 #if     defined(__GNU_LIBRARY__) || defined(__STDC__)
  94 #include <limits.h>
  95 #else
  96 #define CHAR_BIT        8
  97 #endif
  98
  99 /* The allocator divides the heap into blocks of fixed size; large
 100    requests receive one or more whole blocks, and small requests
 101    receive a fragment of a block.  Fragment sizes are powers of two,
 102    and all fragments of a block are the same size.  When all the
 103    fragments in a block have been freed, the block itself is freed.  */
 104 #define INT_BIT         (CHAR_BIT * sizeof(int))
 105 #define BLOCKLOG        (INT_BIT > 16 ? 12 : 9)
 106 #define BLOCKSIZE       (1 << BLOCKLOG)
 107 #define BLOCKIFY(SIZE)  (((SIZE) + BLOCKSIZE - 1) / BLOCKSIZE)
 108
 109 /* Determine the amount of memory spanned by the initial heap table
 110    (not an absolute limit).  */
 111 #define HEAP            (INT_BIT > 16 ? 4194304 : 65536)
 112
 113 /* Number of contiguous free blocks allowed to build up at the end of
 114    memory before they will be returned to the system.  */
 115 #define FINAL_FREE_BLOCKS       8
 116
 117 /* Data structure giving per-block information.  */
 118 typedef union
 119   {
 120     /* Heap information for a busy block.  */
 121     struct
 122       {
 123         /* Zero for a large block, or positive giving the
 124            logarithm to the base two of the fragment size.  */
 125         int type;
 126         union
 127           {
 128             struct
 129               {
 130                 size_t nfree;   /* Free fragments in a fragmented block.  */
 131                 size_t first;   /* First free fragment of the block.  */
 132               } frag;
 133             /* Size (in blocks) of a large cluster.  */
 134             size_t size;
 135           } info;
 136       } busy;
 137     /* Heap information for a free block
 138        (that may be the first of a free cluster).  */
 139     struct
 140       {
 141         size_t size;            /* Size (in blocks) of a free cluster.  */
 142         size_t next;            /* Index of next free cluster.  */
 143         size_t prev;            /* Index of previous free cluster.  */
 144       } free;
 145   } malloc_info;
 146
 147 /* Pointer to first block of the heap.  */
 148 extern char *_heapbase;
 149
 150 /* Table indexed by block number giving per-block information.  */
 151 extern malloc_info *_heapinfo;
 152
 153 /* Address to block number and vice versa.  */
 154 #define BLOCK(A)        (((char *) (A) - _heapbase) / BLOCKSIZE + 1)
 155 #define ADDRESS(B)      ((__ptr_t) (((B) - 1) * BLOCKSIZE + _heapbase))
 156
 157 /* Current search index for the heap table.  */
 158 extern size_t _heapindex;
 159
 160 /* Limit of valid info table indices.  */
 161 extern size_t _heaplimit;
 162
 163 /* Doubly linked lists of free fragments.  */
 164 struct list
 165   {
 166     struct list *next;
 167     struct list *prev;
 168   };
 169
 170 /* Free list headers for each fragment size.  */
 171 extern struct list _fraghead[];
 172
 173 /* List of blocks allocated with `memalign' (or `valloc').  */
 174 struct alignlist
 175   {
 176     struct alignlist *next;
 177     __ptr_t aligned;            /* The address that memaligned returned.  */
 178     __ptr_t exact;              /* The address that malloc returned.  */
 179   };
 180 extern struct alignlist *_aligned_blocks;
 181
 182 /* Instrumentation.  */
 183 extern size_t _chunks_used;
 184 extern size_t _bytes_used;
 185 extern size_t _chunks_free;
 186 extern size_t _bytes_free;
 187
 188 /* Internal version of `free' used in `morecore' (malloc.c). */
 189 extern void _free_internal __P ((__ptr_t __ptr));
 190
 191 #endif /* _MALLOC_INTERNAL.  */
 192
 193 /* Underlying allocation function; successive calls should
 194    return contiguous pieces of memory.  */
 195 extern __ptr_t (*__morecore) __P ((ptrdiff_t __size));
 196
 197 /* Default value of `__morecore'.  */
 198 extern __ptr_t __default_morecore __P ((ptrdiff_t __size));
 199
 200 /* Nonzero if `malloc' has been called and done its initialization.  */
 201 extern int __malloc_initialized;
 202
 203 /* Hooks for debugging versions.  */
 204 extern void (*__free_hook) __P ((__ptr_t __ptr));
 205 extern __ptr_t (*__malloc_hook) __P ((size_t __size));
 206 extern __ptr_t (*__realloc_hook) __P ((__ptr_t __ptr, size_t __size));
 207
 208 /* Activate a standard collection of debugging hooks.  */
 209 extern void mcheck __P ((void (*__func) __P ((void))));
 210
 211 /* Activate a standard collection of tracing hooks.  */
 212 extern void mtrace __P ((void));
 213
 214 /* Statistics available to the user.  */
 215 struct mstats
 216   {
 217     size_t bytes_total;         /* Total size of the heap. */
 218     size_t chunks_used;         /* Chunks allocated by the user. */
 219     size_t bytes_used;          /* Byte total of user-allocated chunks. */
 220     size_t chunks_free;         /* Chunks in the free list. */
 221     size_t bytes_free;          /* Byte total of chunks in the free list. */
 222   };
 223
 224 /* Pick up the current statistics. */
 225 extern struct mstats mstats __P ((void));
 226
 227 #ifdef  __cplusplus
 228 }
 229 #endif
 230
 231 #endif /* mtrace.h  */