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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-6.8/] [libiberty/] [obstack.c] - Blame information for rev 816

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1 24 jeremybenn
/* obstack.c - subroutines used implicitly by object stack macros
2
   Copyright (C) 1988,89,90,91,92,93,94,96,97 Free Software Foundation, Inc.
3
 
4
 
5
   NOTE: This source is derived from an old version taken from the GNU C
6
   Library (glibc).
7
 
8
   This program is free software; you can redistribute it and/or modify it
9
   under the terms of the GNU General Public License as published by the
10
   Free Software Foundation; either version 2, or (at your option) any
11
   later version.
12
 
13
   This program is distributed in the hope that it will be useful,
14
   but WITHOUT ANY WARRANTY; without even the implied warranty of
15
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16
   GNU General Public License for more details.
17
 
18
   You should have received a copy of the GNU General Public License
19
   along with this program; if not, write to the Free Software
20
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301,
21
   USA.  */
22
 
23
#ifdef HAVE_CONFIG_H
24
#include <config.h>
25
#endif
26
 
27
#include "obstack.h"
28
 
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
33
 
34
/* Comment out all this code if we are using the GNU C Library, and are not
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
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
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.  */
42
 
43
#include <stdio.h>              /* Random thing to get __GNU_LIBRARY__.  */
44
#if !defined (_LIBC) && defined (__GNU_LIBRARY__) && __GNU_LIBRARY__ > 1
45
#include <gnu-versions.h>
46
#if _GNU_OBSTACK_INTERFACE_VERSION == OBSTACK_INTERFACE_VERSION
47
#define ELIDE_CODE
48
#endif
49
#endif
50
 
51
 
52
#ifndef ELIDE_CODE
53
 
54
 
55
#define POINTER void *
56
 
57
/* Determine default alignment.  */
58
struct fooalign {char x; double d;};
59
#define DEFAULT_ALIGNMENT  \
60
  ((PTR_INT_TYPE) ((char *) &((struct fooalign *) 0)->d - (char *) 0))
61
/* If malloc were really smart, it would round addresses to DEFAULT_ALIGNMENT.
62
   But in fact it might be less smart and round addresses to as much as
63
   DEFAULT_ROUNDING.  So we prepare for it to do that.  */
64
union fooround {long x; double d;};
65
#define DEFAULT_ROUNDING (sizeof (union fooround))
66
 
67
/* When we copy a long block of data, this is the unit to do it with.
68
   On some machines, copying successive ints does not work;
69
   in such a case, redefine COPYING_UNIT to `long' (if that works)
70
   or `char' as a last resort.  */
71
#ifndef COPYING_UNIT
72
#define COPYING_UNIT int
73
#endif
74
 
75
 
76
/* The functions allocating more room by calling `obstack_chunk_alloc'
77
   jump to the handler pointed to by `obstack_alloc_failed_handler'.
78
   This variable by default points to the internal function
79
   `print_and_abort'.  */
80
static void print_and_abort (void);
81
void (*obstack_alloc_failed_handler) (void) = print_and_abort;
82
 
83
/* Exit value used when `print_and_abort' is used.  */
84
#if defined __GNU_LIBRARY__ || defined HAVE_STDLIB_H
85
#include <stdlib.h>
86
#endif
87
#ifndef EXIT_FAILURE
88
#define EXIT_FAILURE 1
89
#endif
90
int obstack_exit_failure = EXIT_FAILURE;
91
 
92
/* The non-GNU-C macros copy the obstack into this global variable
93
   to avoid multiple evaluation.  */
94
 
95
struct obstack *_obstack;
96
 
97
/* Define a macro that either calls functions with the traditional malloc/free
98
   calling interface, or calls functions with the mmalloc/mfree interface
99
   (that adds an extra first argument), based on the state of use_extra_arg.
100
   For free, do not use ?:, since some compilers, like the MIPS compilers,
101
   do not allow (expr) ? void : void.  */
102
 
103
#if defined (__STDC__) && __STDC__
104
#define CALL_CHUNKFUN(h, size) \
105
  (((h) -> use_extra_arg) \
106
   ? (*(h)->chunkfun) ((h)->extra_arg, (size)) \
107
   : (*(struct _obstack_chunk *(*) (long)) (h)->chunkfun) ((size)))
108
 
109
#define CALL_FREEFUN(h, old_chunk) \
110
  do { \
111
    if ((h) -> use_extra_arg) \
112
      (*(h)->freefun) ((h)->extra_arg, (old_chunk)); \
113
    else \
114
      (*(void (*) (void *)) (h)->freefun) ((old_chunk)); \
115
  } while (0)
116
#else
117
#define CALL_CHUNKFUN(h, size) \
118
  (((h) -> use_extra_arg) \
119
   ? (*(h)->chunkfun) ((h)->extra_arg, (size)) \
120
   : (*(struct _obstack_chunk *(*) ()) (h)->chunkfun) ((size)))
121
 
122
#define CALL_FREEFUN(h, old_chunk) \
123
  do { \
124
    if ((h) -> use_extra_arg) \
125
      (*(h)->freefun) ((h)->extra_arg, (old_chunk)); \
126
    else \
127
      (*(void (*) ()) (h)->freefun) ((old_chunk)); \
128
  } while (0)
129
#endif
130
 
131
 
132
/* Initialize an obstack H for use.  Specify chunk size SIZE (0 means default).
133
   Objects start on multiples of ALIGNMENT (0 means use default).
134
   CHUNKFUN is the function to use to allocate chunks,
135
   and FREEFUN the function to free them.
136
 
137
   Return nonzero if successful, zero if out of memory.
138
   To recover from an out of memory error,
139
   free up some memory, then call this again.  */
140
 
141
int
142
_obstack_begin (struct obstack *h, int size, int alignment,
143
                POINTER (*chunkfun) (long), void (*freefun) (void *))
144
{
145
  register struct _obstack_chunk *chunk; /* points to new chunk */
146
 
147
  if (alignment == 0)
148
    alignment = (int) DEFAULT_ALIGNMENT;
149
  if (size == 0)
150
    /* Default size is what GNU malloc can fit in a 4096-byte block.  */
151
    {
152
      /* 12 is sizeof (mhead) and 4 is EXTRA from GNU malloc.
153
         Use the values for range checking, because if range checking is off,
154
         the extra bytes won't be missed terribly, but if range checking is on
155
         and we used a larger request, a whole extra 4096 bytes would be
156
         allocated.
157
 
158
         These number are irrelevant to the new GNU malloc.  I suspect it is
159
         less sensitive to the size of the request.  */
160
      int extra = ((((12 + DEFAULT_ROUNDING - 1) & ~(DEFAULT_ROUNDING - 1))
161
                    + 4 + DEFAULT_ROUNDING - 1)
162
                   & ~(DEFAULT_ROUNDING - 1));
163
      size = 4096 - extra;
164
    }
165
 
166
  h->chunkfun = (struct _obstack_chunk * (*)(void *, long)) chunkfun;
167
  h->freefun = (void (*) (void *, struct _obstack_chunk *)) freefun;
168
  h->chunk_size = size;
169
  h->alignment_mask = alignment - 1;
170
  h->use_extra_arg = 0;
171
 
172
  chunk = h->chunk = CALL_CHUNKFUN (h, h -> chunk_size);
173
  if (!chunk)
174
    (*obstack_alloc_failed_handler) ();
175
  h->next_free = h->object_base = chunk->contents;
176
  h->chunk_limit = chunk->limit
177
    = (char *) chunk + h->chunk_size;
178
  chunk->prev = 0;
179
  /* The initial chunk now contains no empty object.  */
180
  h->maybe_empty_object = 0;
181
  h->alloc_failed = 0;
182
  return 1;
183
}
184
 
185
int
186
_obstack_begin_1 (struct obstack *h, int size, int alignment,
187
                  POINTER (*chunkfun) (POINTER, long),
188
                  void (*freefun) (POINTER, POINTER), POINTER arg)
189
{
190
  register struct _obstack_chunk *chunk; /* points to new chunk */
191
 
192
  if (alignment == 0)
193
    alignment = (int) DEFAULT_ALIGNMENT;
194
  if (size == 0)
195
    /* Default size is what GNU malloc can fit in a 4096-byte block.  */
196
    {
197
      /* 12 is sizeof (mhead) and 4 is EXTRA from GNU malloc.
198
         Use the values for range checking, because if range checking is off,
199
         the extra bytes won't be missed terribly, but if range checking is on
200
         and we used a larger request, a whole extra 4096 bytes would be
201
         allocated.
202
 
203
         These number are irrelevant to the new GNU malloc.  I suspect it is
204
         less sensitive to the size of the request.  */
205
      int extra = ((((12 + DEFAULT_ROUNDING - 1) & ~(DEFAULT_ROUNDING - 1))
206
                    + 4 + DEFAULT_ROUNDING - 1)
207
                   & ~(DEFAULT_ROUNDING - 1));
208
      size = 4096 - extra;
209
    }
210
 
211
  h->chunkfun = (struct _obstack_chunk * (*)(void *,long)) chunkfun;
212
  h->freefun = (void (*) (void *, struct _obstack_chunk *)) freefun;
213
  h->chunk_size = size;
214
  h->alignment_mask = alignment - 1;
215
  h->extra_arg = arg;
216
  h->use_extra_arg = 1;
217
 
218
  chunk = h->chunk = CALL_CHUNKFUN (h, h -> chunk_size);
219
  if (!chunk)
220
    (*obstack_alloc_failed_handler) ();
221
  h->next_free = h->object_base = chunk->contents;
222
  h->chunk_limit = chunk->limit
223
    = (char *) chunk + h->chunk_size;
224
  chunk->prev = 0;
225
  /* The initial chunk now contains no empty object.  */
226
  h->maybe_empty_object = 0;
227
  h->alloc_failed = 0;
228
  return 1;
229
}
230
 
231
/* Allocate a new current chunk for the obstack *H
232
   on the assumption that LENGTH bytes need to be added
233
   to the current object, or a new object of length LENGTH allocated.
234
   Copies any partial object from the end of the old chunk
235
   to the beginning of the new one.  */
236
 
237
void
238
_obstack_newchunk (struct obstack *h, int length)
239
{
240
  register struct _obstack_chunk *old_chunk = h->chunk;
241
  register struct _obstack_chunk *new_chunk;
242
  register long new_size;
243
  register long obj_size = h->next_free - h->object_base;
244
  register long i;
245
  long already;
246
 
247
  /* Compute size for new chunk.  */
248
  new_size = (obj_size + length) + (obj_size >> 3) + 100;
249
  if (new_size < h->chunk_size)
250
    new_size = h->chunk_size;
251
 
252
  /* Allocate and initialize the new chunk.  */
253
  new_chunk = CALL_CHUNKFUN (h, new_size);
254
  if (!new_chunk)
255
    (*obstack_alloc_failed_handler) ();
256
  h->chunk = new_chunk;
257
  new_chunk->prev = old_chunk;
258
  new_chunk->limit = h->chunk_limit = (char *) new_chunk + new_size;
259
 
260
  /* Move the existing object to the new chunk.
261
     Word at a time is fast and is safe if the object
262
     is sufficiently aligned.  */
263
  if (h->alignment_mask + 1 >= DEFAULT_ALIGNMENT)
264
    {
265
      for (i = obj_size / sizeof (COPYING_UNIT) - 1;
266
           i >= 0; i--)
267
        ((COPYING_UNIT *)new_chunk->contents)[i]
268
          = ((COPYING_UNIT *)h->object_base)[i];
269
      /* We used to copy the odd few remaining bytes as one extra COPYING_UNIT,
270
         but that can cross a page boundary on a machine
271
         which does not do strict alignment for COPYING_UNITS.  */
272
      already = obj_size / sizeof (COPYING_UNIT) * sizeof (COPYING_UNIT);
273
    }
274
  else
275
    already = 0;
276
  /* Copy remaining bytes one by one.  */
277
  for (i = already; i < obj_size; i++)
278
    new_chunk->contents[i] = h->object_base[i];
279
 
280
  /* If the object just copied was the only data in OLD_CHUNK,
281
     free that chunk and remove it from the chain.
282
     But not if that chunk might contain an empty object.  */
283
  if (h->object_base == old_chunk->contents && ! h->maybe_empty_object)
284
    {
285
      new_chunk->prev = old_chunk->prev;
286
      CALL_FREEFUN (h, old_chunk);
287
    }
288
 
289
  h->object_base = new_chunk->contents;
290
  h->next_free = h->object_base + obj_size;
291
  /* The new chunk certainly contains no empty object yet.  */
292
  h->maybe_empty_object = 0;
293
}
294
 
295
/* Return nonzero if object OBJ has been allocated from obstack H.
296
   This is here for debugging.
297
   If you use it in a program, you are probably losing.  */
298
 
299
/* Suppress -Wmissing-prototypes warning.  We don't want to declare this in
300
   obstack.h because it is just for debugging.  */
301
int _obstack_allocated_p (struct obstack *h, POINTER obj);
302
 
303
int
304
_obstack_allocated_p (struct obstack *h, POINTER obj)
305
{
306
  register struct _obstack_chunk *lp;   /* below addr of any objects in this chunk */
307
  register struct _obstack_chunk *plp;  /* point to previous chunk if any */
308
 
309
  lp = (h)->chunk;
310
  /* We use >= rather than > since the object cannot be exactly at
311
     the beginning of the chunk but might be an empty object exactly
312
     at the end of an adjacent chunk.  */
313
  while (lp != 0 && ((POINTER) lp >= obj || (POINTER) (lp)->limit < obj))
314
    {
315
      plp = lp->prev;
316
      lp = plp;
317
    }
318
  return lp != 0;
319
}
320
 
321
/* Free objects in obstack H, including OBJ and everything allocate
322
   more recently than OBJ.  If OBJ is zero, free everything in H.  */
323
 
324
#undef obstack_free
325
 
326
/* This function has two names with identical definitions.
327
   This is the first one, called from non-ANSI code.  */
328
 
329
void
330
_obstack_free (struct obstack *h, POINTER obj)
331
{
332
  register struct _obstack_chunk *lp;   /* below addr of any objects in this chunk */
333
  register struct _obstack_chunk *plp;  /* point to previous chunk if any */
334
 
335
  lp = h->chunk;
336
  /* We use >= because there cannot be an object at the beginning of a chunk.
337
     But there can be an empty object at that address
338
     at the end of another chunk.  */
339
  while (lp != 0 && ((POINTER) lp >= obj || (POINTER) (lp)->limit < obj))
340
    {
341
      plp = lp->prev;
342
      CALL_FREEFUN (h, lp);
343
      lp = plp;
344
      /* If we switch chunks, we can't tell whether the new current
345
         chunk contains an empty object, so assume that it may.  */
346
      h->maybe_empty_object = 1;
347
    }
348
  if (lp)
349
    {
350
      h->object_base = h->next_free = (char *) (obj);
351
      h->chunk_limit = lp->limit;
352
      h->chunk = lp;
353
    }
354
  else if (obj != 0)
355
    /* obj is not in any of the chunks! */
356
    abort ();
357
}
358
 
359
/* This function is used from ANSI code.  */
360
 
361
void
362
obstack_free (struct obstack *h, POINTER obj)
363
{
364
  register struct _obstack_chunk *lp;   /* below addr of any objects in this chunk */
365
  register struct _obstack_chunk *plp;  /* point to previous chunk if any */
366
 
367
  lp = h->chunk;
368
  /* We use >= because there cannot be an object at the beginning of a chunk.
369
     But there can be an empty object at that address
370
     at the end of another chunk.  */
371
  while (lp != 0 && ((POINTER) lp >= obj || (POINTER) (lp)->limit < obj))
372
    {
373
      plp = lp->prev;
374
      CALL_FREEFUN (h, lp);
375
      lp = plp;
376
      /* If we switch chunks, we can't tell whether the new current
377
         chunk contains an empty object, so assume that it may.  */
378
      h->maybe_empty_object = 1;
379
    }
380
  if (lp)
381
    {
382
      h->object_base = h->next_free = (char *) (obj);
383
      h->chunk_limit = lp->limit;
384
      h->chunk = lp;
385
    }
386
  else if (obj != 0)
387
    /* obj is not in any of the chunks! */
388
    abort ();
389
}
390
 
391
int
392
_obstack_memory_used (struct obstack *h)
393
{
394
  register struct _obstack_chunk* lp;
395
  register int nbytes = 0;
396
 
397
  for (lp = h->chunk; lp != 0; lp = lp->prev)
398
    {
399
      nbytes += lp->limit - (char *) lp;
400
    }
401
  return nbytes;
402
}
403
 
404
/* Define the error handler.  */
405
#ifndef _
406
# if (HAVE_LIBINTL_H && ENABLE_NLS) || defined _LIBC
407
#  include <libintl.h>
408
#  ifndef _
409
#   define _(Str) gettext (Str)
410
#  endif
411
# else
412
#  define _(Str) (Str)
413
# endif
414
#endif
415
 
416
static void
417
print_and_abort (void)
418
{
419
  fputs (_("memory exhausted\n"), stderr);
420
  exit (obstack_exit_failure);
421
}
422
 
423
#if 0
424
/* These are now turned off because the applications do not use it
425
   and it uses bcopy via obstack_grow, which causes trouble on sysV.  */
426
 
427
/* Now define the functional versions of the obstack macros.
428
   Define them to simply use the corresponding macros to do the job.  */
429
 
430
/* The function names appear in parentheses in order to prevent
431
   the macro-definitions of the names from being expanded there.  */
432
 
433
POINTER (obstack_base) (struct obstack *obstack)
434
{
435
  return obstack_base (obstack);
436
}
437
 
438
POINTER (obstack_next_free) (struct obstack *obstack)
439
{
440
  return obstack_next_free (obstack);
441
}
442
 
443
int (obstack_object_size) (struct obstack *obstack)
444
{
445
  return obstack_object_size (obstack);
446
}
447
 
448
int (obstack_room) (struct obstack *obstack)
449
{
450
  return obstack_room (obstack);
451
}
452
 
453
int (obstack_make_room) (struct obstack *obstack, int length)
454
{
455
  return obstack_make_room (obstack, length);
456
}
457
 
458
void (obstack_grow) (struct obstack *obstack, POINTER pointer, int length)
459
{
460
  obstack_grow (obstack, pointer, length);
461
}
462
 
463
void (obstack_grow0) (struct obstack *obstack, POINTER pointer, int length)
464
{
465
  obstack_grow0 (obstack, pointer, length);
466
}
467
 
468
void (obstack_1grow) (struct obstack *obstack, int character)
469
{
470
  obstack_1grow (obstack, character);
471
}
472
 
473
void (obstack_blank) (struct obstack *obstack, int length)
474
{
475
  obstack_blank (obstack, length);
476
}
477
 
478
void (obstack_1grow_fast) (struct obstack *obstack, int character)
479
{
480
  obstack_1grow_fast (obstack, character);
481
}
482
 
483
void (obstack_blank_fast) (struct obstack *obstack, int length)
484
{
485
  obstack_blank_fast (obstack, length);
486
}
487
 
488
POINTER (obstack_finish) (struct obstack *obstack)
489
{
490
  return obstack_finish (obstack);
491
}
492
 
493
POINTER (obstack_alloc) (struct obstack *obstack, int length)
494
{
495
  return obstack_alloc (obstack, length);
496
}
497
 
498
POINTER (obstack_copy) (struct obstack *obstack, POINTER pointer, int length)
499
{
500
  return obstack_copy (obstack, pointer, length);
501
}
502
 
503
POINTER (obstack_copy0) (struct obstack *obstack, POINTER pointer, int length)
504
{
505
  return obstack_copy0 (obstack, pointer, length);
506
}
507
 
508
#endif /* 0 */
509
 
510
#endif  /* !ELIDE_CODE */

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