| 1 | /* |
| 2 | * This file is part of DisOrder. |
| 3 | * Copyright (C) 2004, 2005, 2006, 2007 Richard Kettlewell |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| 18 | * USA |
| 19 | */ |
| 20 | /** @file lib/mem.c |
| 21 | * @brief Memory management |
| 22 | */ |
| 23 | |
| 24 | #include "common.h" |
| 25 | |
| 26 | #if GC |
| 27 | #include <gc.h> |
| 28 | #endif |
| 29 | #include <errno.h> |
| 30 | |
| 31 | #include "mem.h" |
| 32 | #include "log.h" |
| 33 | #include "printf.h" |
| 34 | |
| 35 | #include "disorder.h" |
| 36 | |
| 37 | /** @brief Allocate and zero out |
| 38 | * @param n Number of bytes to allocate |
| 39 | * @return Pointer to allocated memory, or 0 |
| 40 | */ |
| 41 | static void *malloc_and_zero(size_t n) { |
| 42 | void *ptr = malloc(n); |
| 43 | |
| 44 | if(ptr) memset(ptr, 0, n); |
| 45 | return ptr; |
| 46 | } |
| 47 | |
| 48 | #if GC |
| 49 | static void *(*do_malloc)(size_t) = GC_malloc; |
| 50 | static void *(*do_realloc)(void *, size_t) = GC_realloc; |
| 51 | static void *(*do_malloc_atomic)(size_t) = GC_malloc_atomic; |
| 52 | static void (*do_free)(void *) = GC_free; |
| 53 | #else |
| 54 | static void *(*do_malloc)(size_t) = malloc_and_zero; |
| 55 | static void *(*do_realloc)(void *, size_t) = realloc; |
| 56 | static void *(*do_malloc_atomic)(size_t) = malloc; |
| 57 | static void (*do_free)(void *) = free; |
| 58 | #endif |
| 59 | |
| 60 | /** @brief Initialize memory management |
| 61 | * |
| 62 | * Must be called by all programs that use garbage collection. Define |
| 63 | * @c ${DISORDER_GC} to @c no to suppress use of the collector |
| 64 | * (e.g. for debugging purposes). |
| 65 | */ |
| 66 | void mem_init(void) { |
| 67 | #if GC |
| 68 | const char *e; |
| 69 | |
| 70 | if(((e = getenv("DISORDER_GC")) && !strcmp(e, "no"))) { |
| 71 | do_malloc = malloc_and_zero; |
| 72 | do_malloc_atomic = malloc; |
| 73 | do_realloc = realloc; |
| 74 | do_free = free; |
| 75 | } else { |
| 76 | GC_init(); |
| 77 | assert(GC_all_interior_pointers); |
| 78 | } |
| 79 | #endif |
| 80 | } |
| 81 | |
| 82 | /** @brief Allocate memory |
| 83 | * @param n Bytes to allocate |
| 84 | * @return Pointer to allocated memory |
| 85 | * |
| 86 | * Terminates the process on error. The allocated memory is always |
| 87 | * 0-filled. |
| 88 | */ |
| 89 | void *xmalloc(size_t n) { |
| 90 | void *ptr; |
| 91 | |
| 92 | if(!(ptr = do_malloc(n)) && n) |
| 93 | fatal(errno, "error allocating memory"); |
| 94 | return ptr; |
| 95 | } |
| 96 | |
| 97 | /** @brief Reallocate memory |
| 98 | * @param ptr Block to reallocated |
| 99 | * @param n Bytes to allocate |
| 100 | * @return Pointer to allocated memory |
| 101 | * |
| 102 | * Terminates the process on error. It is NOT guaranteed that any |
| 103 | * additional memory allocated is 0-filled. |
| 104 | */ |
| 105 | void *xrealloc(void *ptr, size_t n) { |
| 106 | if(!(ptr = do_realloc(ptr, n)) && n) |
| 107 | fatal(errno, "error allocating memory"); |
| 108 | return ptr; |
| 109 | } |
| 110 | |
| 111 | /** @brief Allocate memory |
| 112 | * @param count Number of objects to allocate |
| 113 | * @param size Size of one object |
| 114 | * @return Pointer to allocated memory |
| 115 | * |
| 116 | * Terminates the process on error. The allocated memory is always |
| 117 | * 0-filled. |
| 118 | */ |
| 119 | void *xcalloc(size_t count, size_t size) { |
| 120 | if(count > SIZE_MAX / size) |
| 121 | fatal(0, "excessively large calloc"); |
| 122 | return xmalloc(count * size); |
| 123 | } |
| 124 | |
| 125 | /** @brief Allocate memory |
| 126 | * @param n Bytes to allocate |
| 127 | * @return Pointer to allocated memory |
| 128 | * |
| 129 | * Terminates the process on error. The allocated memory is not |
| 130 | * guaranteed to be 0-filled and is not suitable for storing pointers |
| 131 | * in. |
| 132 | */ |
| 133 | void *xmalloc_noptr(size_t n) { |
| 134 | void *ptr; |
| 135 | |
| 136 | if(!(ptr = do_malloc_atomic(n)) && n) |
| 137 | fatal(errno, "error allocating memory"); |
| 138 | return ptr; |
| 139 | } |
| 140 | |
| 141 | /** @brief Reallocate memory |
| 142 | * @param ptr Block to reallocated |
| 143 | * @param n Bytes to allocate |
| 144 | * @return Pointer to allocated memory |
| 145 | * |
| 146 | * Terminates the processf on error. It is NOT guaranteed that any |
| 147 | * additional memory allocated is 0-filled. The block must have been |
| 148 | * allocated with xmalloc_noptr() (or xrealloc_noptr()) initially. |
| 149 | */ |
| 150 | void *xrealloc_noptr(void *ptr, size_t n) { |
| 151 | if(ptr == 0) |
| 152 | return xmalloc_noptr(n); |
| 153 | if(!(ptr = do_realloc(ptr, n)) && n) |
| 154 | fatal(errno, "error allocating memory"); |
| 155 | return ptr; |
| 156 | } |
| 157 | |
| 158 | /** @brief Duplicate a string |
| 159 | * @param s String to copy |
| 160 | * @return New copy of string |
| 161 | * |
| 162 | * This uses the equivalent of xmalloc_noptr() to allocate the new string. |
| 163 | */ |
| 164 | char *xstrdup(const char *s) { |
| 165 | char *t; |
| 166 | |
| 167 | if(!(t = do_malloc_atomic(strlen(s) + 1))) |
| 168 | fatal(errno, "error allocating memory"); |
| 169 | return strcpy(t, s); |
| 170 | } |
| 171 | |
| 172 | /** @brief Duplicate a prefix of a string |
| 173 | * @param s String to copy |
| 174 | * @param n Prefix of string to copy |
| 175 | * @return New copy of string |
| 176 | * |
| 177 | * This uses the equivalent of xmalloc_noptr() to allocate the new string. |
| 178 | * @p n must not exceed the length of the string. |
| 179 | */ |
| 180 | char *xstrndup(const char *s, size_t n) { |
| 181 | char *t; |
| 182 | |
| 183 | if(!(t = do_malloc_atomic(n + 1))) |
| 184 | fatal(errno, "error allocating memory"); |
| 185 | memcpy(t, s, n); |
| 186 | t[n] = 0; |
| 187 | return t; |
| 188 | } |
| 189 | |
| 190 | /** @brief Free memory |
| 191 | * @param ptr Block to free or 0 |
| 192 | */ |
| 193 | void xfree(void *ptr) { |
| 194 | do_free(ptr); |
| 195 | } |
| 196 | |
| 197 | /* |
| 198 | Local Variables: |
| 199 | c-basic-offset:2 |
| 200 | comment-column:40 |
| 201 | End: |
| 202 | */ |