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 (at) 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 */ 232
