Mercurial > hg > octave-kai > gnulib-hg
annotate lib/obstack.c @ 7550:0d3d27f21643
Make it possible to rename obstack_free.
| author | Bruno Haible <bruno@clisp.org> |
|---|---|
| date | Mon, 23 Oct 2006 19:40:24 +0000 |
| parents | 8a1a9361108c |
| children | bbbbbf4cd1c5 |
| rev | line source |
|---|---|
| 334 | 1 /* obstack.c - subroutines used implicitly by object stack macros |
| 4667 | 2 |
| 3 Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1996, 1997, | |
|
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4 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software |
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5 Foundation, Inc. |
| 4667 | 6 |
| 4020 | 7 This program is free software; you can redistribute it and/or modify |
| 8 it under the terms of the GNU General Public License as published by | |
| 9 the Free Software Foundation; either version 2, or (at your option) | |
| 10 any later version. | |
| 334 | 11 |
| 4020 | 12 This program is distributed in the hope that it will be useful, |
| 881 | 13 but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 4020 | 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 GNU General Public License for more details. | |
| 334 | 16 |
| 4020 | 17 You should have received a copy of the GNU General Public License along |
| 18 with this program; if not, write to the Free Software Foundation, | |
|
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19 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ |
| 334 | 20 |
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21 #ifdef _LIBC |
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22 # include <obstack.h> |
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23 # include <shlib-compat.h> |
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24 #else |
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25 # include <config.h> |
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26 # include "obstack.h" |
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27 #endif |
| 334 | 28 |
| 779 | 29 /* NOTE BEFORE MODIFYING THIS FILE: This version number must be |
| 30 incremented whenever callers compiled using an old obstack.h can no | |
| 31 longer properly call the functions in this obstack.c. */ | |
| 32 #define OBSTACK_INTERFACE_VERSION 1 | |
| 334 | 33 |
| 34 /* Comment out all this code if we are using the GNU C Library, and are not | |
| 779 | 35 actually compiling the library itself, and the installed library |
| 36 supports the same library interface we do. This code is part of the GNU | |
| 37 C Library, but also included in many other GNU distributions. Compiling | |
| 334 | 38 and linking in this code is a waste when using the GNU C library |
| 39 (especially if it is a shared library). Rather than having every GNU | |
| 779 | 40 program understand `configure --with-gnu-libc' and omit the object |
| 41 files, it is simpler to just do this in the source for each such file. */ | |
| 334 | 42 |
| 779 | 43 #include <stdio.h> /* Random thing to get __GNU_LIBRARY__. */ |
| 3362 | 44 #if !defined _LIBC && defined __GNU_LIBRARY__ && __GNU_LIBRARY__ > 1 |
| 2475 | 45 # include <gnu-versions.h> |
| 46 # if _GNU_OBSTACK_INTERFACE_VERSION == OBSTACK_INTERFACE_VERSION | |
| 47 # define ELIDE_CODE | |
| 48 # endif | |
| 779 | 49 #endif |
| 50 | |
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51 #include <stddef.h> |
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52 |
| 779 | 53 #ifndef ELIDE_CODE |
| 334 | 54 |
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55 # include <stdint.h> |
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56 |
| 334 | 57 /* Determine default alignment. */ |
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58 union fooround |
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59 { |
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60 uintmax_t i; |
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61 long double d; |
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62 void *p; |
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63 }; |
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64 struct fooalign |
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65 { |
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66 char c; |
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67 union fooround u; |
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68 }; |
| 334 | 69 /* If malloc were really smart, it would round addresses to DEFAULT_ALIGNMENT. |
| 70 But in fact it might be less smart and round addresses to as much as | |
| 71 DEFAULT_ROUNDING. So we prepare for it to do that. */ | |
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72 enum |
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73 { |
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74 DEFAULT_ALIGNMENT = offsetof (struct fooalign, u), |
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75 DEFAULT_ROUNDING = sizeof (union fooround) |
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76 }; |
| 334 | 77 |
| 78 /* When we copy a long block of data, this is the unit to do it with. | |
| 79 On some machines, copying successive ints does not work; | |
| 80 in such a case, redefine COPYING_UNIT to `long' (if that works) | |
| 81 or `char' as a last resort. */ | |
| 2475 | 82 # ifndef COPYING_UNIT |
| 83 # define COPYING_UNIT int | |
| 84 # endif | |
| 334 | 85 |
| 881 | 86 |
| 87 /* The functions allocating more room by calling `obstack_chunk_alloc' | |
| 88 jump to the handler pointed to by `obstack_alloc_failed_handler'. | |
| 2475 | 89 This can be set to a user defined function which should either |
| 90 abort gracefully or use longjump - but shouldn't return. This | |
| 91 variable by default points to the internal function | |
| 881 | 92 `print_and_abort'. */ |
| 93 static void print_and_abort (void); | |
| 94 void (*obstack_alloc_failed_handler) (void) = print_and_abort; | |
| 95 | |
| 96 /* Exit value used when `print_and_abort' is used. */ | |
| 4667 | 97 # include <stdlib.h> |
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98 # ifdef _LIBC |
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99 int obstack_exit_failure = EXIT_FAILURE; |
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100 # else |
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101 # include "exitfail.h" |
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102 # define obstack_exit_failure exit_failure |
| 2475 | 103 # endif |
| 881 | 104 |
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105 # ifdef _LIBC |
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106 # if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_3_4) |
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107 /* A looong time ago (before 1994, anyway; we're not sure) this global variable |
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108 was used by non-GNU-C macros to avoid multiple evaluation. The GNU C |
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109 library still exports it because somebody might use it. */ |
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110 struct obstack *_obstack_compat; |
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111 compat_symbol (libc, _obstack_compat, _obstack, GLIBC_2_0); |
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112 # endif |
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113 # endif |
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114 |
| 334 | 115 /* Define a macro that either calls functions with the traditional malloc/free |
| 116 calling interface, or calls functions with the mmalloc/mfree interface | |
| 117 (that adds an extra first argument), based on the state of use_extra_arg. | |
| 118 For free, do not use ?:, since some compilers, like the MIPS compilers, | |
| 119 do not allow (expr) ? void : void. */ | |
| 120 | |
| 4667 | 121 # define CALL_CHUNKFUN(h, size) \ |
| 881 | 122 (((h) -> use_extra_arg) \ |
| 123 ? (*(h)->chunkfun) ((h)->extra_arg, (size)) \ | |
| 124 : (*(struct _obstack_chunk *(*) (long)) (h)->chunkfun) ((size))) | |
| 125 | |
| 4667 | 126 # define CALL_FREEFUN(h, old_chunk) \ |
| 881 | 127 do { \ |
| 128 if ((h) -> use_extra_arg) \ | |
| 129 (*(h)->freefun) ((h)->extra_arg, (old_chunk)); \ | |
| 130 else \ | |
| 131 (*(void (*) (void *)) (h)->freefun) ((old_chunk)); \ | |
| 132 } while (0) | |
| 334 | 133 |
| 134 | |
| 135 /* Initialize an obstack H for use. Specify chunk size SIZE (0 means default). | |
| 136 Objects start on multiples of ALIGNMENT (0 means use default). | |
| 137 CHUNKFUN is the function to use to allocate chunks, | |
| 138 and FREEFUN the function to free them. | |
| 139 | |
| 2475 | 140 Return nonzero if successful, calls obstack_alloc_failed_handler if |
| 141 allocation fails. */ | |
| 334 | 142 |
| 143 int | |
| 4667 | 144 _obstack_begin (struct obstack *h, |
| 145 int size, int alignment, | |
| 146 void *(*chunkfun) (long), | |
| 147 void (*freefun) (void *)) | |
| 334 | 148 { |
| 881 | 149 register struct _obstack_chunk *chunk; /* points to new chunk */ |
| 334 | 150 |
| 151 if (alignment == 0) | |
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152 alignment = DEFAULT_ALIGNMENT; |
| 334 | 153 if (size == 0) |
| 154 /* Default size is what GNU malloc can fit in a 4096-byte block. */ | |
| 155 { | |
| 156 /* 12 is sizeof (mhead) and 4 is EXTRA from GNU malloc. | |
| 157 Use the values for range checking, because if range checking is off, | |
| 158 the extra bytes won't be missed terribly, but if range checking is on | |
| 159 and we used a larger request, a whole extra 4096 bytes would be | |
| 160 allocated. | |
| 161 | |
| 162 These number are irrelevant to the new GNU malloc. I suspect it is | |
| 163 less sensitive to the size of the request. */ | |
| 164 int extra = ((((12 + DEFAULT_ROUNDING - 1) & ~(DEFAULT_ROUNDING - 1)) | |
| 165 + 4 + DEFAULT_ROUNDING - 1) | |
| 166 & ~(DEFAULT_ROUNDING - 1)); | |
| 167 size = 4096 - extra; | |
| 168 } | |
| 169 | |
| 881 | 170 h->chunkfun = (struct _obstack_chunk * (*)(void *, long)) chunkfun; |
| 171 h->freefun = (void (*) (void *, struct _obstack_chunk *)) freefun; | |
| 334 | 172 h->chunk_size = size; |
| 173 h->alignment_mask = alignment - 1; | |
| 174 h->use_extra_arg = 0; | |
| 175 | |
| 176 chunk = h->chunk = CALL_CHUNKFUN (h, h -> chunk_size); | |
| 177 if (!chunk) | |
| 881 | 178 (*obstack_alloc_failed_handler) (); |
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179 h->next_free = h->object_base = __PTR_ALIGN ((char *) chunk, chunk->contents, |
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180 alignment - 1); |
| 334 | 181 h->chunk_limit = chunk->limit |
| 182 = (char *) chunk + h->chunk_size; | |
| 183 chunk->prev = 0; | |
| 184 /* The initial chunk now contains no empty object. */ | |
| 185 h->maybe_empty_object = 0; | |
| 881 | 186 h->alloc_failed = 0; |
| 334 | 187 return 1; |
| 188 } | |
| 189 | |
| 190 int | |
| 4667 | 191 _obstack_begin_1 (struct obstack *h, int size, int alignment, |
| 192 void *(*chunkfun) (void *, long), | |
| 193 void (*freefun) (void *, void *), | |
| 194 void *arg) | |
| 334 | 195 { |
| 881 | 196 register struct _obstack_chunk *chunk; /* points to new chunk */ |
| 334 | 197 |
| 198 if (alignment == 0) | |
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199 alignment = DEFAULT_ALIGNMENT; |
| 334 | 200 if (size == 0) |
| 201 /* Default size is what GNU malloc can fit in a 4096-byte block. */ | |
| 202 { | |
| 203 /* 12 is sizeof (mhead) and 4 is EXTRA from GNU malloc. | |
| 204 Use the values for range checking, because if range checking is off, | |
| 205 the extra bytes won't be missed terribly, but if range checking is on | |
| 206 and we used a larger request, a whole extra 4096 bytes would be | |
| 207 allocated. | |
| 208 | |
| 209 These number are irrelevant to the new GNU malloc. I suspect it is | |
| 210 less sensitive to the size of the request. */ | |
| 211 int extra = ((((12 + DEFAULT_ROUNDING - 1) & ~(DEFAULT_ROUNDING - 1)) | |
| 212 + 4 + DEFAULT_ROUNDING - 1) | |
| 213 & ~(DEFAULT_ROUNDING - 1)); | |
| 214 size = 4096 - extra; | |
| 215 } | |
| 216 | |
| 881 | 217 h->chunkfun = (struct _obstack_chunk * (*)(void *,long)) chunkfun; |
| 218 h->freefun = (void (*) (void *, struct _obstack_chunk *)) freefun; | |
| 334 | 219 h->chunk_size = size; |
| 220 h->alignment_mask = alignment - 1; | |
| 221 h->extra_arg = arg; | |
| 222 h->use_extra_arg = 1; | |
| 223 | |
| 224 chunk = h->chunk = CALL_CHUNKFUN (h, h -> chunk_size); | |
| 225 if (!chunk) | |
| 881 | 226 (*obstack_alloc_failed_handler) (); |
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227 h->next_free = h->object_base = __PTR_ALIGN ((char *) chunk, chunk->contents, |
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228 alignment - 1); |
| 334 | 229 h->chunk_limit = chunk->limit |
| 230 = (char *) chunk + h->chunk_size; | |
| 231 chunk->prev = 0; | |
| 232 /* The initial chunk now contains no empty object. */ | |
| 233 h->maybe_empty_object = 0; | |
| 881 | 234 h->alloc_failed = 0; |
| 334 | 235 return 1; |
| 236 } | |
| 237 | |
| 238 /* Allocate a new current chunk for the obstack *H | |
| 239 on the assumption that LENGTH bytes need to be added | |
| 240 to the current object, or a new object of length LENGTH allocated. | |
| 241 Copies any partial object from the end of the old chunk | |
| 242 to the beginning of the new one. */ | |
| 243 | |
| 244 void | |
| 4667 | 245 _obstack_newchunk (struct obstack *h, int length) |
| 334 | 246 { |
| 881 | 247 register struct _obstack_chunk *old_chunk = h->chunk; |
| 248 register struct _obstack_chunk *new_chunk; | |
| 334 | 249 register long new_size; |
| 2475 | 250 register long obj_size = h->next_free - h->object_base; |
| 251 register long i; | |
| 252 long already; | |
| 2915 | 253 char *object_base; |
| 334 | 254 |
| 255 /* Compute size for new chunk. */ | |
| 2915 | 256 new_size = (obj_size + length) + (obj_size >> 3) + h->alignment_mask + 100; |
| 334 | 257 if (new_size < h->chunk_size) |
| 258 new_size = h->chunk_size; | |
| 259 | |
| 260 /* Allocate and initialize the new chunk. */ | |
| 261 new_chunk = CALL_CHUNKFUN (h, new_size); | |
| 262 if (!new_chunk) | |
| 881 | 263 (*obstack_alloc_failed_handler) (); |
| 334 | 264 h->chunk = new_chunk; |
| 265 new_chunk->prev = old_chunk; | |
| 266 new_chunk->limit = h->chunk_limit = (char *) new_chunk + new_size; | |
| 267 | |
| 2915 | 268 /* Compute an aligned object_base in the new chunk */ |
| 269 object_base = | |
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270 __PTR_ALIGN ((char *) new_chunk, new_chunk->contents, h->alignment_mask); |
| 2915 | 271 |
| 334 | 272 /* Move the existing object to the new chunk. |
| 273 Word at a time is fast and is safe if the object | |
| 274 is sufficiently aligned. */ | |
| 275 if (h->alignment_mask + 1 >= DEFAULT_ALIGNMENT) | |
| 276 { | |
| 277 for (i = obj_size / sizeof (COPYING_UNIT) - 1; | |
| 278 i >= 0; i--) | |
| 2915 | 279 ((COPYING_UNIT *)object_base)[i] |
| 334 | 280 = ((COPYING_UNIT *)h->object_base)[i]; |
| 281 /* We used to copy the odd few remaining bytes as one extra COPYING_UNIT, | |
| 282 but that can cross a page boundary on a machine | |
| 283 which does not do strict alignment for COPYING_UNITS. */ | |
| 284 already = obj_size / sizeof (COPYING_UNIT) * sizeof (COPYING_UNIT); | |
| 285 } | |
| 286 else | |
| 287 already = 0; | |
| 288 /* Copy remaining bytes one by one. */ | |
| 289 for (i = already; i < obj_size; i++) | |
| 2915 | 290 object_base[i] = h->object_base[i]; |
| 334 | 291 |
| 292 /* If the object just copied was the only data in OLD_CHUNK, | |
| 293 free that chunk and remove it from the chain. | |
| 294 But not if that chunk might contain an empty object. */ | |
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295 if (! h->maybe_empty_object |
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296 && (h->object_base |
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297 == __PTR_ALIGN ((char *) old_chunk, old_chunk->contents, |
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298 h->alignment_mask))) |
| 334 | 299 { |
| 300 new_chunk->prev = old_chunk->prev; | |
| 301 CALL_FREEFUN (h, old_chunk); | |
| 302 } | |
| 303 | |
| 2915 | 304 h->object_base = object_base; |
| 334 | 305 h->next_free = h->object_base + obj_size; |
| 306 /* The new chunk certainly contains no empty object yet. */ | |
| 307 h->maybe_empty_object = 0; | |
| 308 } | |
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309 # ifdef _LIBC |
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310 libc_hidden_def (_obstack_newchunk) |
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311 # endif |
| 334 | 312 |
| 313 /* Return nonzero if object OBJ has been allocated from obstack H. | |
| 314 This is here for debugging. | |
| 315 If you use it in a program, you are probably losing. */ | |
| 316 | |
| 317 /* Suppress -Wmissing-prototypes warning. We don't want to declare this in | |
| 318 obstack.h because it is just for debugging. */ | |
| 4667 | 319 int _obstack_allocated_p (struct obstack *h, void *obj); |
| 334 | 320 |
| 321 int | |
| 4667 | 322 _obstack_allocated_p (struct obstack *h, void *obj) |
| 334 | 323 { |
| 881 | 324 register struct _obstack_chunk *lp; /* below addr of any objects in this chunk */ |
| 325 register struct _obstack_chunk *plp; /* point to previous chunk if any */ | |
| 334 | 326 |
| 327 lp = (h)->chunk; | |
| 328 /* We use >= rather than > since the object cannot be exactly at | |
| 329 the beginning of the chunk but might be an empty object exactly | |
| 881 | 330 at the end of an adjacent chunk. */ |
| 4667 | 331 while (lp != 0 && ((void *) lp >= obj || (void *) (lp)->limit < obj)) |
| 334 | 332 { |
| 333 plp = lp->prev; | |
| 334 lp = plp; | |
| 335 } | |
| 336 return lp != 0; | |
| 337 } | |
| 338 | |
| 339 /* Free objects in obstack H, including OBJ and everything allocate | |
| 340 more recently than OBJ. If OBJ is zero, free everything in H. */ | |
| 341 | |
| 2475 | 342 # undef obstack_free |
| 334 | 343 |
| 344 void | |
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345 __obstack_free (struct obstack *h, void *obj) |
| 334 | 346 { |
| 881 | 347 register struct _obstack_chunk *lp; /* below addr of any objects in this chunk */ |
| 348 register struct _obstack_chunk *plp; /* point to previous chunk if any */ | |
| 334 | 349 |
| 350 lp = h->chunk; | |
| 351 /* We use >= because there cannot be an object at the beginning of a chunk. | |
| 352 But there can be an empty object at that address | |
| 353 at the end of another chunk. */ | |
| 4667 | 354 while (lp != 0 && ((void *) lp >= obj || (void *) (lp)->limit < obj)) |
| 334 | 355 { |
| 356 plp = lp->prev; | |
| 357 CALL_FREEFUN (h, lp); | |
| 358 lp = plp; | |
| 359 /* If we switch chunks, we can't tell whether the new current | |
| 360 chunk contains an empty object, so assume that it may. */ | |
| 361 h->maybe_empty_object = 1; | |
| 362 } | |
| 363 if (lp) | |
| 364 { | |
| 881 | 365 h->object_base = h->next_free = (char *) (obj); |
| 334 | 366 h->chunk_limit = lp->limit; |
| 367 h->chunk = lp; | |
| 368 } | |
| 369 else if (obj != 0) | |
| 370 /* obj is not in any of the chunks! */ | |
| 371 abort (); | |
| 372 } | |
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373 |
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374 # ifdef _LIBC |
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375 /* Older versions of libc used a function _obstack_free intended to be |
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376 called by non-GCC compilers. */ |
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377 strong_alias (obstack_free, _obstack_free) |
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378 # endif |
| 334 | 379 |
| 881 | 380 int |
| 4667 | 381 _obstack_memory_used (struct obstack *h) |
| 881 | 382 { |
| 383 register struct _obstack_chunk* lp; | |
| 384 register int nbytes = 0; | |
| 385 | |
| 386 for (lp = h->chunk; lp != 0; lp = lp->prev) | |
| 387 { | |
| 388 nbytes += lp->limit - (char *) lp; | |
| 389 } | |
| 390 return nbytes; | |
| 391 } | |
| 392 | |
| 393 /* Define the error handler. */ | |
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394 # ifdef _LIBC |
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395 # include <libintl.h> |
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396 # else |
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397 # include "gettext.h" |
| 881 | 398 # endif |
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399 # ifndef _ |
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400 # define _(msgid) gettext (msgid) |
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401 # endif |
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402 |
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403 # ifdef _LIBC |
| 2475 | 404 # include <libio/iolibio.h> |
| 405 # endif | |
| 881 | 406 |
| 3361 | 407 # ifndef __attribute__ |
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408 /* This feature is available in gcc versions 2.5 and later. */ |
| 3361 | 409 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5) |
| 410 # define __attribute__(Spec) /* empty */ | |
| 411 # endif | |
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412 # endif |
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413 |
| 881 | 414 static void |
| 3280 | 415 __attribute__ ((noreturn)) |
| 4667 | 416 print_and_abort (void) |
| 881 | 417 { |
| 3361 | 418 /* Don't change any of these strings. Yes, it would be possible to add |
| 419 the newline to the string and use fputs or so. But this must not | |
| 420 happen because the "memory exhausted" message appears in other places | |
| 421 like this and the translation should be reused instead of creating | |
| 422 a very similar string which requires a separate translation. */ | |
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423 # ifdef _LIBC |
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424 (void) __fxprintf (NULL, "%s\n", _("memory exhausted")); |
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425 # else |
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426 fprintf (stderr, "%s\n", _("memory exhausted")); |
| 3361 | 427 # endif |
| 881 | 428 exit (obstack_exit_failure); |
| 429 } | |
| 334 | 430 |
| 779 | 431 #endif /* !ELIDE_CODE */ |