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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [boehm-gc/] [mallocx.c] - Blame information for rev 753

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Line No. Rev Author Line
1 721 jeremybenn
/*
2
 * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
3
 * Copyright (c) 1991-1994 by Xerox Corporation.  All rights reserved.
4
 * Copyright (c) 1996 by Silicon Graphics.  All rights reserved.
5
 * Copyright (c) 2000 by Hewlett-Packard Company.  All rights reserved.
6
 *
7
 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
8
 * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
9
 *
10
 * Permission is hereby granted to use or copy this program
11
 * for any purpose,  provided the above notices are retained on all copies.
12
 * Permission to modify the code and to distribute modified code is granted,
13
 * provided the above notices are retained, and a notice that the code was
14
 * modified is included with the above copyright notice.
15
 */
16
 
17
/*
18
 * These are extra allocation routines which are likely to be less
19
 * frequently used than those in malloc.c.  They are separate in the
20
 * hope that the .o file will be excluded from statically linked
21
 * executables.  We should probably break this up further.
22
 */
23
 
24
#include <stdio.h>
25
#include "private/gc_priv.h"
26
 
27
extern ptr_t GC_clear_stack();  /* in misc.c, behaves like identity */
28
void GC_extend_size_map();      /* in misc.c. */
29
GC_bool GC_alloc_reclaim_list();        /* in malloc.c */
30
 
31
/* Some externally visible but unadvertised variables to allow access to */
32
/* free lists from inlined allocators without including gc_priv.h        */
33
/* or introducing dependencies on internal data structure layouts.       */
34
ptr_t * GC_CONST GC_objfreelist_ptr = GC_objfreelist;
35
ptr_t * GC_CONST GC_aobjfreelist_ptr = GC_aobjfreelist;
36
ptr_t * GC_CONST GC_uobjfreelist_ptr = GC_uobjfreelist;
37
# ifdef ATOMIC_UNCOLLECTABLE
38
    ptr_t * GC_CONST GC_auobjfreelist_ptr = GC_auobjfreelist;
39
# endif
40
 
41
 
42
GC_PTR GC_generic_or_special_malloc(lb,knd)
43
word lb;
44
int knd;
45
{
46
    switch(knd) {
47
#     ifdef STUBBORN_ALLOC
48
        case STUBBORN:
49
            return(GC_malloc_stubborn((size_t)lb));
50
#     endif
51
        case PTRFREE:
52
            return(GC_malloc_atomic((size_t)lb));
53
        case NORMAL:
54
            return(GC_malloc((size_t)lb));
55
        case UNCOLLECTABLE:
56
            return(GC_malloc_uncollectable((size_t)lb));
57
#       ifdef ATOMIC_UNCOLLECTABLE
58
          case AUNCOLLECTABLE:
59
            return(GC_malloc_atomic_uncollectable((size_t)lb));
60
#       endif /* ATOMIC_UNCOLLECTABLE */
61
        default:
62
            return(GC_generic_malloc(lb,knd));
63
    }
64
}
65
 
66
 
67
/* Change the size of the block pointed to by p to contain at least   */
68
/* lb bytes.  The object may be (and quite likely will be) moved.     */
69
/* The kind (e.g. atomic) is the same as that of the old.             */
70
/* Shrinking of large blocks is not implemented well.                 */
71
# ifdef __STDC__
72
    GC_PTR GC_realloc(GC_PTR p, size_t lb)
73
# else
74
    GC_PTR GC_realloc(p,lb)
75
    GC_PTR p;
76
    size_t lb;
77
# endif
78
{
79
register struct hblk * h;
80
register hdr * hhdr;
81
register word sz;        /* Current size in bytes       */
82
register word orig_sz;   /* Original sz in bytes        */
83
int obj_kind;
84
 
85
    if (p == 0) return(GC_malloc(lb));   /* Required by ANSI */
86
    h = HBLKPTR(p);
87
    hhdr = HDR(h);
88
    sz = hhdr -> hb_sz;
89
    obj_kind = hhdr -> hb_obj_kind;
90
    sz = WORDS_TO_BYTES(sz);
91
    orig_sz = sz;
92
 
93
    if (sz > MAXOBJBYTES) {
94
        /* Round it up to the next whole heap block */
95
          register word descr;
96
 
97
          sz = (sz+HBLKSIZE-1) & (~HBLKMASK);
98
          hhdr -> hb_sz = BYTES_TO_WORDS(sz);
99
          descr = GC_obj_kinds[obj_kind].ok_descriptor;
100
          if (GC_obj_kinds[obj_kind].ok_relocate_descr) descr += sz;
101
          hhdr -> hb_descr = descr;
102
          if (IS_UNCOLLECTABLE(obj_kind)) GC_non_gc_bytes += (sz - orig_sz);
103
          /* Extra area is already cleared by GC_alloc_large_and_clear. */
104
    }
105
    if (ADD_SLOP(lb) <= sz) {
106
        if (lb >= (sz >> 1)) {
107
#           ifdef STUBBORN_ALLOC
108
                if (obj_kind == STUBBORN) GC_change_stubborn(p);
109
#           endif
110
            if (orig_sz > lb) {
111
              /* Clear unneeded part of object to avoid bogus pointer */
112
              /* tracing.                                             */
113
              /* Safe for stubborn objects.                           */
114
                BZERO(((ptr_t)p) + lb, orig_sz - lb);
115
            }
116
            return(p);
117
        } else {
118
            /* shrink */
119
              GC_PTR result =
120
                        GC_generic_or_special_malloc((word)lb, obj_kind);
121
 
122
              if (result == 0) return(0);
123
                  /* Could also return original object.  But this       */
124
                  /* gives the client warning of imminent disaster.     */
125
              BCOPY(p, result, lb);
126
#             ifndef IGNORE_FREE
127
                GC_free(p);
128
#             endif
129
              return(result);
130
        }
131
    } else {
132
        /* grow */
133
          GC_PTR result =
134
                GC_generic_or_special_malloc((word)lb, obj_kind);
135
 
136
          if (result == 0) return(0);
137
          BCOPY(p, result, sz);
138
#         ifndef IGNORE_FREE
139
            GC_free(p);
140
#         endif
141
          return(result);
142
    }
143
}
144
 
145
# if defined(REDIRECT_MALLOC) && !defined(REDIRECT_REALLOC)
146
#   define REDIRECT_REALLOC GC_realloc
147
# endif
148
 
149
# ifdef REDIRECT_REALLOC
150
 
151
/* As with malloc, avoid two levels of extra calls here.        */
152
# ifdef GC_ADD_CALLER
153
#   define RA GC_RETURN_ADDR,
154
# else
155
#   define RA
156
# endif
157
# define GC_debug_realloc_replacement(p, lb) \
158
        GC_debug_realloc(p, lb, RA "unknown", 0)
159
 
160
# ifdef __STDC__
161
    GC_PTR realloc(GC_PTR p, size_t lb)
162
# else
163
    GC_PTR realloc(p,lb)
164
    GC_PTR p;
165
    size_t lb;
166
# endif
167
  {
168
    return(REDIRECT_REALLOC(p, lb));
169
  }
170
 
171
# undef GC_debug_realloc_replacement
172
# endif /* REDIRECT_REALLOC */
173
 
174
 
175
/* Allocate memory such that only pointers to near the          */
176
/* beginning of the object are considered.                      */
177
/* We avoid holding allocation lock while we clear memory.      */
178
ptr_t GC_generic_malloc_ignore_off_page(lb, k)
179
register size_t lb;
180
register int k;
181
{
182
    register ptr_t result;
183
    word lw;
184
    word n_blocks;
185
    GC_bool init;
186
    DCL_LOCK_STATE;
187
 
188
    if (SMALL_OBJ(lb))
189
        return(GC_generic_malloc((word)lb, k));
190
    lw = ROUNDED_UP_WORDS(lb);
191
    n_blocks = OBJ_SZ_TO_BLOCKS(lw);
192
    init = GC_obj_kinds[k].ok_init;
193
    if (GC_have_errors) GC_print_all_errors();
194
    GC_INVOKE_FINALIZERS();
195
    DISABLE_SIGNALS();
196
    LOCK();
197
    result = (ptr_t)GC_alloc_large(lw, k, IGNORE_OFF_PAGE);
198
    if (0 != result) {
199
        if (GC_debugging_started) {
200
            BZERO(result, n_blocks * HBLKSIZE);
201
        } else {
202
#           ifdef THREADS
203
              /* Clear any memory that might be used for GC descriptors */
204
              /* before we release the lock.                          */
205
                ((word *)result)[0] = 0;
206
                ((word *)result)[1] = 0;
207
                ((word *)result)[lw-1] = 0;
208
                ((word *)result)[lw-2] = 0;
209
#           endif
210
        }
211
    }
212
    GC_words_allocd += lw;
213
    UNLOCK();
214
    ENABLE_SIGNALS();
215
    if (0 == result) {
216
        return((*GC_oom_fn)(lb));
217
    } else {
218
        if (init && !GC_debugging_started) {
219
            BZERO(result, n_blocks * HBLKSIZE);
220
        }
221
        return(result);
222
    }
223
}
224
 
225
# if defined(__STDC__) || defined(__cplusplus)
226
  void * GC_malloc_ignore_off_page(size_t lb)
227
# else
228
  char * GC_malloc_ignore_off_page(lb)
229
  register size_t lb;
230
# endif
231
{
232
    return((GC_PTR)GC_generic_malloc_ignore_off_page(lb, NORMAL));
233
}
234
 
235
# if defined(__STDC__) || defined(__cplusplus)
236
  void * GC_malloc_atomic_ignore_off_page(size_t lb)
237
# else
238
  char * GC_malloc_atomic_ignore_off_page(lb)
239
  register size_t lb;
240
# endif
241
{
242
    return((GC_PTR)GC_generic_malloc_ignore_off_page(lb, PTRFREE));
243
}
244
 
245
/* Increment GC_words_allocd from code that doesn't have direct access  */
246
/* to GC_arrays.                                                        */
247
# ifdef __STDC__
248
void GC_incr_words_allocd(size_t n)
249
{
250
    GC_words_allocd += n;
251
}
252
 
253
/* The same for GC_mem_freed.                           */
254
void GC_incr_mem_freed(size_t n)
255
{
256
    GC_mem_freed += n;
257
}
258
# endif /* __STDC__ */
259
 
260
/* Analogous to the above, but assumes a small object size, and         */
261
/* bypasses MERGE_SIZES mechanism.  Used by gc_inline.h.                */
262
ptr_t GC_generic_malloc_words_small_inner(lw, k)
263
register word lw;
264
register int k;
265
{
266
register ptr_t op;
267
register ptr_t *opp;
268
register struct obj_kind * kind = GC_obj_kinds + k;
269
 
270
    opp = &(kind -> ok_freelist[lw]);
271
    if( (op = *opp) == 0 ) {
272
        if (!GC_is_initialized) {
273
            GC_init_inner();
274
        }
275
        if (kind -> ok_reclaim_list != 0 || GC_alloc_reclaim_list(kind)) {
276
            op = GC_clear_stack(GC_allocobj((word)lw, k));
277
        }
278
        if (op == 0) {
279
            UNLOCK();
280
            ENABLE_SIGNALS();
281
            return ((*GC_oom_fn)(WORDS_TO_BYTES(lw)));
282
        }
283
    }
284
    *opp = obj_link(op);
285
    obj_link(op) = 0;
286
    GC_words_allocd += lw;
287
    return((ptr_t)op);
288
}
289
 
290
/* Analogous to the above, but assumes a small object size, and         */
291
/* bypasses MERGE_SIZES mechanism.  Used by gc_inline.h.                */
292
#ifdef __STDC__
293
     ptr_t GC_generic_malloc_words_small(size_t lw, int k)
294
#else 
295
     ptr_t GC_generic_malloc_words_small(lw, k)
296
     register word lw;
297
     register int k;
298
#endif
299
{
300
register ptr_t op;
301
DCL_LOCK_STATE;
302
 
303
    if (GC_have_errors) GC_print_all_errors();
304
    GC_INVOKE_FINALIZERS();
305
    DISABLE_SIGNALS();
306
    LOCK();
307
    op = GC_generic_malloc_words_small_inner(lw, k);
308
    UNLOCK();
309
    ENABLE_SIGNALS();
310
    return((ptr_t)op);
311
}
312
 
313
#if defined(THREADS) && !defined(SRC_M3)
314
 
315
extern signed_word GC_mem_found;   /* Protected by GC lock.  */
316
 
317
#ifdef PARALLEL_MARK
318
volatile signed_word GC_words_allocd_tmp = 0;
319
                        /* Number of words of memory allocated since    */
320
                        /* we released the GC lock.  Instead of         */
321
                        /* reacquiring the GC lock just to add this in, */
322
                        /* we add it in the next time we reacquire      */
323
                        /* the lock.  (Atomically adding it doesn't     */
324
                        /* work, since we would have to atomically      */
325
                        /* update it in GC_malloc, which is too         */
326
                        /* expensive.                                   */
327
#endif /* PARALLEL_MARK */
328
 
329
/* See reclaim.c: */
330
extern ptr_t GC_reclaim_generic();
331
 
332
/* Return a list of 1 or more objects of the indicated size, linked     */
333
/* through the first word in the object.  This has the advantage that   */
334
/* it acquires the allocation lock only once, and may greatly reduce    */
335
/* time wasted contending for the allocation lock.  Typical usage would */
336
/* be in a thread that requires many items of the same size.  It would  */
337
/* keep its own free list in thread-local storage, and call             */
338
/* GC_malloc_many or friends to replenish it.  (We do not round up      */
339
/* object sizes, since a call indicates the intention to consume many   */
340
/* objects of exactly this size.)                                       */
341
/* We return the free-list by assigning it to *result, since it is      */
342
/* not safe to return, e.g. a linked list of pointer-free objects,      */
343
/* since the collector would not retain the entire list if it were      */
344
/* invoked just as we were returning.                                   */
345
/* Note that the client should usually clear the link field.            */
346
void GC_generic_malloc_many(lb, k, result)
347
register word lb;
348
register int k;
349
ptr_t *result;
350
{
351
ptr_t op;
352
ptr_t p;
353
ptr_t *opp;
354
word lw;
355
word my_words_allocd = 0;
356
struct obj_kind * ok = &(GC_obj_kinds[k]);
357
DCL_LOCK_STATE;
358
 
359
#   if defined(GATHERSTATS) || defined(PARALLEL_MARK)
360
#     define COUNT_ARG , &my_words_allocd
361
#   else
362
#     define COUNT_ARG
363
#     define NEED_TO_COUNT
364
#   endif
365
    if (!SMALL_OBJ(lb)) {
366
        op = GC_generic_malloc(lb, k);
367
        if(0 != op) obj_link(op) = 0;
368
        *result = op;
369
        return;
370
    }
371
    lw = ALIGNED_WORDS(lb);
372
    if (GC_have_errors) GC_print_all_errors();
373
    GC_INVOKE_FINALIZERS();
374
    DISABLE_SIGNALS();
375
    LOCK();
376
    if (!GC_is_initialized) GC_init_inner();
377
    /* Do our share of marking work */
378
      if (GC_incremental && !GC_dont_gc) {
379
        ENTER_GC();
380
        GC_collect_a_little_inner(1);
381
        EXIT_GC();
382
      }
383
    /* First see if we can reclaim a page of objects waiting to be */
384
    /* reclaimed.                                                  */
385
    {
386
        struct hblk ** rlh = ok -> ok_reclaim_list;
387
        struct hblk * hbp;
388
        hdr * hhdr;
389
 
390
        rlh += lw;
391
        while ((hbp = *rlh) != 0) {
392
            hhdr = HDR(hbp);
393
            *rlh = hhdr -> hb_next;
394
            hhdr -> hb_last_reclaimed = (unsigned short) GC_gc_no;
395
#           ifdef PARALLEL_MARK
396
                {
397
                  signed_word my_words_allocd_tmp = GC_words_allocd_tmp;
398
 
399
                  GC_ASSERT(my_words_allocd_tmp >= 0);
400
                  /* We only decrement it while holding the GC lock.    */
401
                  /* Thus we can't accidentally adjust it down in more  */
402
                  /* than one thread simultaneously.                    */
403
                  if (my_words_allocd_tmp != 0) {
404
                    (void)GC_atomic_add(
405
                                (volatile GC_word *)(&GC_words_allocd_tmp),
406
                                (GC_word)(-my_words_allocd_tmp));
407
                    GC_words_allocd += my_words_allocd_tmp;
408
                  }
409
                }
410
                GC_acquire_mark_lock();
411
                ++ GC_fl_builder_count;
412
                UNLOCK();
413
                ENABLE_SIGNALS();
414
                GC_release_mark_lock();
415
#           endif
416
            op = GC_reclaim_generic(hbp, hhdr, lw,
417
                                    ok -> ok_init, 0 COUNT_ARG);
418
            if (op != 0) {
419
#             ifdef NEED_TO_COUNT
420
                /* We are neither gathering statistics, nor marking in  */
421
                /* parallel.  Thus GC_reclaim_generic doesn't count     */
422
                /* for us.                                              */
423
                for (p = op; p != 0; p = obj_link(p)) {
424
                  my_words_allocd += lw;
425
                }
426
#             endif
427
#             if defined(GATHERSTATS)
428
                /* We also reclaimed memory, so we need to adjust       */
429
                /* that count.                                          */
430
                /* This should be atomic, so the results may be         */
431
                /* inaccurate.                                          */
432
                GC_mem_found += my_words_allocd;
433
#             endif
434
#             ifdef PARALLEL_MARK
435
                *result = op;
436
                (void)GC_atomic_add(
437
                                (volatile GC_word *)(&GC_words_allocd_tmp),
438
                                (GC_word)(my_words_allocd));
439
                GC_acquire_mark_lock();
440
                -- GC_fl_builder_count;
441
                if (GC_fl_builder_count == 0) GC_notify_all_builder();
442
                GC_release_mark_lock();
443
                (void) GC_clear_stack(0);
444
                return;
445
#             else
446
                GC_words_allocd += my_words_allocd;
447
                goto out;
448
#             endif
449
            }
450
#           ifdef PARALLEL_MARK
451
              GC_acquire_mark_lock();
452
              -- GC_fl_builder_count;
453
              if (GC_fl_builder_count == 0) GC_notify_all_builder();
454
              GC_release_mark_lock();
455
              DISABLE_SIGNALS();
456
              LOCK();
457
              /* GC lock is needed for reclaim list access.     We      */
458
              /* must decrement fl_builder_count before reaquiring GC   */
459
              /* lock.  Hopefully this path is rare.                    */
460
#           endif
461
        }
462
    }
463
    /* Next try to use prefix of global free list if there is one.      */
464
    /* We don't refill it, but we need to use it up before allocating   */
465
    /* a new block ourselves.                                           */
466
      opp = &(GC_obj_kinds[k].ok_freelist[lw]);
467
      if ( (op = *opp) != 0 ) {
468
        *opp = 0;
469
        my_words_allocd = 0;
470
        for (p = op; p != 0; p = obj_link(p)) {
471
          my_words_allocd += lw;
472
          if (my_words_allocd >= BODY_SZ) {
473
            *opp = obj_link(p);
474
            obj_link(p) = 0;
475
            break;
476
          }
477
        }
478
        GC_words_allocd += my_words_allocd;
479
        goto out;
480
      }
481
    /* Next try to allocate a new block worth of objects of this size.  */
482
    {
483
        struct hblk *h = GC_allochblk(lw, k, 0);
484
        if (h != 0) {
485
          if (IS_UNCOLLECTABLE(k)) GC_set_hdr_marks(HDR(h));
486
          GC_words_allocd += BYTES_TO_WORDS(HBLKSIZE)
487
                               - BYTES_TO_WORDS(HBLKSIZE) % lw;
488
#         ifdef PARALLEL_MARK
489
            GC_acquire_mark_lock();
490
            ++ GC_fl_builder_count;
491
            UNLOCK();
492
            ENABLE_SIGNALS();
493
            GC_release_mark_lock();
494
#         endif
495
 
496
          op = GC_build_fl(h, lw, ok -> ok_init, 0);
497
#         ifdef PARALLEL_MARK
498
            *result = op;
499
            GC_acquire_mark_lock();
500
            -- GC_fl_builder_count;
501
            if (GC_fl_builder_count == 0) GC_notify_all_builder();
502
            GC_release_mark_lock();
503
            (void) GC_clear_stack(0);
504
            return;
505
#         else
506
            goto out;
507
#         endif
508
        }
509
    }
510
 
511
    /* As a last attempt, try allocating a single object.  Note that    */
512
    /* this may trigger a collection or expand the heap.                */
513
      op = GC_generic_malloc_inner(lb, k);
514
      if (0 != op) obj_link(op) = 0;
515
 
516
  out:
517
    *result = op;
518
    UNLOCK();
519
    ENABLE_SIGNALS();
520
    (void) GC_clear_stack(0);
521
}
522
 
523
GC_PTR GC_malloc_many(size_t lb)
524
{
525
    ptr_t result;
526
    GC_generic_malloc_many(lb, NORMAL, &result);
527
    return result;
528
}
529
 
530
/* Note that the "atomic" version of this would be unsafe, since the    */
531
/* links would not be seen by the collector.                            */
532
# endif
533
 
534
/* Allocate lb bytes of pointerful, traced, but not collectable data */
535
# ifdef __STDC__
536
    GC_PTR GC_malloc_uncollectable(size_t lb)
537
# else
538
    GC_PTR GC_malloc_uncollectable(lb)
539
    size_t lb;
540
# endif
541
{
542
register ptr_t op;
543
register ptr_t *opp;
544
register word lw;
545
DCL_LOCK_STATE;
546
 
547
    if( SMALL_OBJ(lb) ) {
548
#       ifdef MERGE_SIZES
549
          if (EXTRA_BYTES != 0 && lb != 0) lb--;
550
                  /* We don't need the extra byte, since this won't be  */
551
                  /* collected anyway.                                  */
552
          lw = GC_size_map[lb];
553
#       else
554
          lw = ALIGNED_WORDS(lb);
555
#       endif
556
        opp = &(GC_uobjfreelist[lw]);
557
        FASTLOCK();
558
        if( FASTLOCK_SUCCEEDED() && (op = *opp) != 0 ) {
559
            /* See above comment on signals.    */
560
            *opp = obj_link(op);
561
            obj_link(op) = 0;
562
            GC_words_allocd += lw;
563
            /* Mark bit ws already set on free list.  It will be        */
564
            /* cleared only temporarily during a collection, as a       */
565
            /* result of the normal free list mark bit clearing.        */
566
            GC_non_gc_bytes += WORDS_TO_BYTES(lw);
567
            FASTUNLOCK();
568
            return((GC_PTR) op);
569
        }
570
        FASTUNLOCK();
571
        op = (ptr_t)GC_generic_malloc((word)lb, UNCOLLECTABLE);
572
    } else {
573
        op = (ptr_t)GC_generic_malloc((word)lb, UNCOLLECTABLE);
574
    }
575
    if (0 == op) return(0);
576
    /* We don't need the lock here, since we have an undisguised        */
577
    /* pointer.  We do need to hold the lock while we adjust            */
578
    /* mark bits.                                                       */
579
    {
580
        register struct hblk * h;
581
 
582
        h = HBLKPTR(op);
583
        lw = HDR(h) -> hb_sz;
584
 
585
        DISABLE_SIGNALS();
586
        LOCK();
587
        GC_set_mark_bit(op);
588
        GC_non_gc_bytes += WORDS_TO_BYTES(lw);
589
        UNLOCK();
590
        ENABLE_SIGNALS();
591
        return((GC_PTR) op);
592
    }
593
}
594
 
595
#ifdef __STDC__
596
/* Not well tested nor integrated.      */
597
/* Debug version is tricky and currently missing.       */
598
#include <limits.h>
599
 
600
GC_PTR GC_memalign(size_t align, size_t lb)
601
{
602
    size_t new_lb;
603
    size_t offset;
604
    ptr_t result;
605
 
606
#   ifdef ALIGN_DOUBLE
607
        if (align <= WORDS_TO_BYTES(2) && lb > align) return GC_malloc(lb);
608
#   endif
609
    if (align <= WORDS_TO_BYTES(1)) return GC_malloc(lb);
610
    if (align >= HBLKSIZE/2 || lb >= HBLKSIZE/2) {
611
        if (align > HBLKSIZE) return GC_oom_fn(LONG_MAX-1024) /* Fail */;
612
        return GC_malloc(lb <= HBLKSIZE? HBLKSIZE : lb);
613
            /* Will be HBLKSIZE aligned.        */
614
    }
615
    /* We could also try to make sure that the real rounded-up object size */
616
    /* is a multiple of align.  That would be correct up to HBLKSIZE.      */
617
    new_lb = lb + align - 1;
618
    result = GC_malloc(new_lb);
619
    offset = (word)result % align;
620
    if (offset != 0) {
621
        offset = align - offset;
622
        if (!GC_all_interior_pointers) {
623
            if (offset >= VALID_OFFSET_SZ) return GC_malloc(HBLKSIZE);
624
            GC_register_displacement(offset);
625
        }
626
    }
627
    result = (GC_PTR) ((ptr_t)result + offset);
628
    GC_ASSERT((word)result % align == 0);
629
    return result;
630
}
631
#endif 
632
 
633
# ifdef ATOMIC_UNCOLLECTABLE
634
/* Allocate lb bytes of pointerfree, untraced, uncollectable data       */
635
/* This is normally roughly equivalent to the system malloc.            */
636
/* But it may be useful if malloc is redefined.                         */
637
# ifdef __STDC__
638
    GC_PTR GC_malloc_atomic_uncollectable(size_t lb)
639
# else
640
    GC_PTR GC_malloc_atomic_uncollectable(lb)
641
    size_t lb;
642
# endif
643
{
644
register ptr_t op;
645
register ptr_t *opp;
646
register word lw;
647
DCL_LOCK_STATE;
648
 
649
    if( SMALL_OBJ(lb) ) {
650
#       ifdef MERGE_SIZES
651
          if (EXTRA_BYTES != 0 && lb != 0) lb--;
652
                  /* We don't need the extra byte, since this won't be  */
653
                  /* collected anyway.                                  */
654
          lw = GC_size_map[lb];
655
#       else
656
          lw = ALIGNED_WORDS(lb);
657
#       endif
658
        opp = &(GC_auobjfreelist[lw]);
659
        FASTLOCK();
660
        if( FASTLOCK_SUCCEEDED() && (op = *opp) != 0 ) {
661
            /* See above comment on signals.    */
662
            *opp = obj_link(op);
663
            obj_link(op) = 0;
664
            GC_words_allocd += lw;
665
            /* Mark bit was already set while object was on free list. */
666
            GC_non_gc_bytes += WORDS_TO_BYTES(lw);
667
            FASTUNLOCK();
668
            return((GC_PTR) op);
669
        }
670
        FASTUNLOCK();
671
        op = (ptr_t)GC_generic_malloc((word)lb, AUNCOLLECTABLE);
672
    } else {
673
        op = (ptr_t)GC_generic_malloc((word)lb, AUNCOLLECTABLE);
674
    }
675
    if (0 == op) return(0);
676
    /* We don't need the lock here, since we have an undisguised        */
677
    /* pointer.  We do need to hold the lock while we adjust            */
678
    /* mark bits.                                                       */
679
    {
680
        register struct hblk * h;
681
 
682
        h = HBLKPTR(op);
683
        lw = HDR(h) -> hb_sz;
684
 
685
        DISABLE_SIGNALS();
686
        LOCK();
687
        GC_set_mark_bit(op);
688
        GC_non_gc_bytes += WORDS_TO_BYTES(lw);
689
        UNLOCK();
690
        ENABLE_SIGNALS();
691
        return((GC_PTR) op);
692
    }
693
}
694
 
695
#endif /* ATOMIC_UNCOLLECTABLE */

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