summaryrefslogtreecommitdiffstats
path: root/boehm-gc/mallocx.c
blob: 5ad593dabb9961d1a1792428744f214ac61132e2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
/*
 * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
 * Copyright (c) 1991-1994 by Xerox Corporation.  All rights reserved.
 * Copyright (c) 1996 by Silicon Graphics.  All rights reserved.
 * Copyright (c) 2000 by Hewlett-Packard Company.  All rights reserved.
 *
 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
 * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
 *
 * Permission is hereby granted to use or copy this program
 * for any purpose,  provided the above notices are retained on all copies.
 * Permission to modify the code and to distribute modified code is granted,
 * provided the above notices are retained, and a notice that the code was
 * modified is included with the above copyright notice.
 */

/*
 * These are extra allocation routines which are likely to be less
 * frequently used than those in malloc.c.  They are separate in the
 * hope that the .o file will be excluded from statically linked
 * executables.  We should probably break this up further.
 */

#include <stdio.h>
#include "private/gc_priv.h"

extern ptr_t GC_clear_stack();  /* in misc.c, behaves like identity */
void GC_extend_size_map();      /* in misc.c. */
GC_bool GC_alloc_reclaim_list();	/* in malloc.c */

/* Some externally visible but unadvertised variables to allow access to */
/* free lists from inlined allocators without including gc_priv.h	 */
/* or introducing dependencies on internal data structure layouts.	 */
ptr_t * GC_CONST GC_objfreelist_ptr = GC_objfreelist;
ptr_t * GC_CONST GC_aobjfreelist_ptr = GC_aobjfreelist;
ptr_t * GC_CONST GC_uobjfreelist_ptr = GC_uobjfreelist;
# ifdef ATOMIC_UNCOLLECTABLE
    ptr_t * GC_CONST GC_auobjfreelist_ptr = GC_auobjfreelist;
# endif


GC_PTR GC_generic_or_special_malloc(lb,knd)
word lb;
int knd;
{
    switch(knd) {
#     ifdef STUBBORN_ALLOC
	case STUBBORN:
	    return(GC_malloc_stubborn((size_t)lb));
#     endif
	case PTRFREE:
	    return(GC_malloc_atomic((size_t)lb));
	case NORMAL:
	    return(GC_malloc((size_t)lb));
	case UNCOLLECTABLE:
	    return(GC_malloc_uncollectable((size_t)lb));
#       ifdef ATOMIC_UNCOLLECTABLE
	  case AUNCOLLECTABLE:
	    return(GC_malloc_atomic_uncollectable((size_t)lb));
#	endif /* ATOMIC_UNCOLLECTABLE */
	default:
	    return(GC_generic_malloc(lb,knd));
    }
}


/* Change the size of the block pointed to by p to contain at least   */
/* lb bytes.  The object may be (and quite likely will be) moved.     */
/* The kind (e.g. atomic) is the same as that of the old.	      */
/* Shrinking of large blocks is not implemented well.                 */
# ifdef __STDC__
    GC_PTR GC_realloc(GC_PTR p, size_t lb)
# else
    GC_PTR GC_realloc(p,lb)
    GC_PTR p;
    size_t lb;
# endif
{
register struct hblk * h;
register hdr * hhdr;
register word sz;	 /* Current size in bytes	*/
register word orig_sz;	 /* Original sz in bytes	*/
int obj_kind;

    if (p == 0) return(GC_malloc(lb));	/* Required by ANSI */
    h = HBLKPTR(p);
    hhdr = HDR(h);
    sz = hhdr -> hb_sz;
    obj_kind = hhdr -> hb_obj_kind;
    sz = WORDS_TO_BYTES(sz);
    orig_sz = sz;

    if (sz > MAXOBJBYTES) {
	/* Round it up to the next whole heap block */
	  register word descr;
	  
	  sz = (sz+HBLKSIZE-1) & (~HBLKMASK);
	  hhdr -> hb_sz = BYTES_TO_WORDS(sz);
	  descr = GC_obj_kinds[obj_kind].ok_descriptor;
          if (GC_obj_kinds[obj_kind].ok_relocate_descr) descr += sz;
          hhdr -> hb_descr = descr;
	  if (IS_UNCOLLECTABLE(obj_kind)) GC_non_gc_bytes += (sz - orig_sz);
	  /* Extra area is already cleared by GC_alloc_large_and_clear. */
    }
    if (ADD_SLOP(lb) <= sz) {
	if (lb >= (sz >> 1)) {
#	    ifdef STUBBORN_ALLOC
	        if (obj_kind == STUBBORN) GC_change_stubborn(p);
#	    endif
	    if (orig_sz > lb) {
	      /* Clear unneeded part of object to avoid bogus pointer */
	      /* tracing.					      */
	      /* Safe for stubborn objects.			      */
	        BZERO(((ptr_t)p) + lb, orig_sz - lb);
	    }
	    return(p);
	} else {
	    /* shrink */
	      GC_PTR result =
	      		GC_generic_or_special_malloc((word)lb, obj_kind);

	      if (result == 0) return(0);
	          /* Could also return original object.  But this 	*/
	          /* gives the client warning of imminent disaster.	*/
	      BCOPY(p, result, lb);
#	      ifndef IGNORE_FREE
	        GC_free(p);
#	      endif
	      return(result);
	}
    } else {
	/* grow */
	  GC_PTR result =
	  	GC_generic_or_special_malloc((word)lb, obj_kind);

	  if (result == 0) return(0);
	  BCOPY(p, result, sz);
#	  ifndef IGNORE_FREE
	    GC_free(p);
#	  endif
	  return(result);
    }
}

# if defined(REDIRECT_MALLOC) && !defined(REDIRECT_REALLOC)
#   define REDIRECT_REALLOC GC_realloc
# endif

# ifdef REDIRECT_REALLOC

/* As with malloc, avoid two levels of extra calls here.	*/
# ifdef GC_ADD_CALLER
#   define RA GC_RETURN_ADDR,
# else
#   define RA
# endif
# define GC_debug_realloc_replacement(p, lb) \
	GC_debug_realloc(p, lb, RA "unknown", 0)

# ifdef __STDC__
    GC_PTR realloc(GC_PTR p, size_t lb)
# else
    GC_PTR realloc(p,lb)
    GC_PTR p;
    size_t lb;
# endif
  {
    return(REDIRECT_REALLOC(p, lb));
  }

# undef GC_debug_realloc_replacement
# endif /* REDIRECT_REALLOC */


/* Allocate memory such that only pointers to near the 		*/
/* beginning of the object are considered.			*/
/* We avoid holding allocation lock while we clear memory.	*/
ptr_t GC_generic_malloc_ignore_off_page(lb, k)
register size_t lb;
register int k;
{
    register ptr_t result;
    word lw;
    word n_blocks;
    GC_bool init;
    DCL_LOCK_STATE;
    
    if (SMALL_OBJ(lb))
        return(GC_generic_malloc((word)lb, k));
    lw = ROUNDED_UP_WORDS(lb);
    n_blocks = OBJ_SZ_TO_BLOCKS(lw);
    init = GC_obj_kinds[k].ok_init;
    if (GC_have_errors) GC_print_all_errors();
    GC_INVOKE_FINALIZERS();
    DISABLE_SIGNALS();
    LOCK();
    result = (ptr_t)GC_alloc_large(lw, k, IGNORE_OFF_PAGE);
    if (0 != result) {
        if (GC_debugging_started) {
	    BZERO(result, n_blocks * HBLKSIZE);
        } else {
#           ifdef THREADS
	      /* Clear any memory that might be used for GC descriptors */
	      /* before we release the lock.			      */
	        ((word *)result)[0] = 0;
	        ((word *)result)[1] = 0;
	        ((word *)result)[lw-1] = 0;
	        ((word *)result)[lw-2] = 0;
#	    endif
        }
    }
    GC_words_allocd += lw;
    UNLOCK();
    ENABLE_SIGNALS();
    if (0 == result) {
        return((*GC_oom_fn)(lb));
    } else {
    	if (init && !GC_debugging_started) {
	    BZERO(result, n_blocks * HBLKSIZE);
        }
        return(result);
    }
}

# if defined(__STDC__) || defined(__cplusplus)
  void * GC_malloc_ignore_off_page(size_t lb)
# else
  char * GC_malloc_ignore_off_page(lb)
  register size_t lb;
# endif
{
    return((GC_PTR)GC_generic_malloc_ignore_off_page(lb, NORMAL));
}

# if defined(__STDC__) || defined(__cplusplus)
  void * GC_malloc_atomic_ignore_off_page(size_t lb)
# else
  char * GC_malloc_atomic_ignore_off_page(lb)
  register size_t lb;
# endif
{
    return((GC_PTR)GC_generic_malloc_ignore_off_page(lb, PTRFREE));
}

/* Increment GC_words_allocd from code that doesn't have direct access 	*/
/* to GC_arrays.							*/
# ifdef __STDC__
void GC_incr_words_allocd(size_t n)
{
    GC_words_allocd += n;
}

/* The same for GC_mem_freed.				*/
void GC_incr_mem_freed(size_t n)
{
    GC_mem_freed += n;
}
# endif /* __STDC__ */

/* Analogous to the above, but assumes a small object size, and 	*/
/* bypasses MERGE_SIZES mechanism.  Used by gc_inline.h.		*/
ptr_t GC_generic_malloc_words_small_inner(lw, k)
register word lw;
register int k;
{
register ptr_t op;
register ptr_t *opp;
register struct obj_kind * kind = GC_obj_kinds + k;

    opp = &(kind -> ok_freelist[lw]);
    if( (op = *opp) == 0 ) {
        if (!GC_is_initialized) {
            GC_init_inner();
        }
	if (kind -> ok_reclaim_list != 0 || GC_alloc_reclaim_list(kind)) {
	    op = GC_clear_stack(GC_allocobj((word)lw, k));
	}
	if (op == 0) {
	    UNLOCK();
	    ENABLE_SIGNALS();
	    return ((*GC_oom_fn)(WORDS_TO_BYTES(lw)));
	}
    }
    *opp = obj_link(op);
    obj_link(op) = 0;
    GC_words_allocd += lw;
    return((ptr_t)op);
}

/* Analogous to the above, but assumes a small object size, and 	*/
/* bypasses MERGE_SIZES mechanism.  Used by gc_inline.h.		*/
#ifdef __STDC__
     ptr_t GC_generic_malloc_words_small(size_t lw, int k)
#else 
     ptr_t GC_generic_malloc_words_small(lw, k)
     register word lw;
     register int k;
#endif
{
register ptr_t op;
DCL_LOCK_STATE;

    if (GC_have_errors) GC_print_all_errors();
    GC_INVOKE_FINALIZERS();
    DISABLE_SIGNALS();
    LOCK();
    op = GC_generic_malloc_words_small_inner(lw, k);
    UNLOCK();
    ENABLE_SIGNALS();
    return((ptr_t)op);
}

#if defined(THREADS) && !defined(SRC_M3)

extern signed_word GC_mem_found;   /* Protected by GC lock.  */

#ifdef PARALLEL_MARK
volatile signed_word GC_words_allocd_tmp = 0;
                        /* Number of words of memory allocated since    */
                        /* we released the GC lock.  Instead of         */
                        /* reacquiring the GC lock just to add this in, */
                        /* we add it in the next time we reacquire      */
                        /* the lock.  (Atomically adding it doesn't     */
                        /* work, since we would have to atomically      */
                        /* update it in GC_malloc, which is too         */
                        /* expensive.                                   */
#endif /* PARALLEL_MARK */

/* See reclaim.c: */
extern ptr_t GC_reclaim_generic();

/* Return a list of 1 or more objects of the indicated size, linked	*/
/* through the first word in the object.  This has the advantage that	*/
/* it acquires the allocation lock only once, and may greatly reduce	*/
/* time wasted contending for the allocation lock.  Typical usage would */
/* be in a thread that requires many items of the same size.  It would	*/
/* keep its own free list in thread-local storage, and call		*/
/* GC_malloc_many or friends to replenish it.  (We do not round up	*/
/* object sizes, since a call indicates the intention to consume many	*/
/* objects of exactly this size.)					*/
/* We return the free-list by assigning it to *result, since it is	*/
/* not safe to return, e.g. a linked list of pointer-free objects,	*/
/* since the collector would not retain the entire list if it were 	*/
/* invoked just as we were returning.					*/
/* Note that the client should usually clear the link field.		*/
void GC_generic_malloc_many(lb, k, result)
register word lb;
register int k;
ptr_t *result;
{
ptr_t op;
ptr_t p;
ptr_t *opp;
word lw;
word my_words_allocd = 0;
struct obj_kind * ok = &(GC_obj_kinds[k]);
DCL_LOCK_STATE;

#   if defined(GATHERSTATS) || defined(PARALLEL_MARK)
#     define COUNT_ARG , &my_words_allocd
#   else
#     define COUNT_ARG
#     define NEED_TO_COUNT
#   endif
    if (!SMALL_OBJ(lb)) {
        op = GC_generic_malloc(lb, k);
        if(0 != op) obj_link(op) = 0;
	*result = op;
        return;
    }
    lw = ALIGNED_WORDS(lb);
    if (GC_have_errors) GC_print_all_errors();
    GC_INVOKE_FINALIZERS();
    DISABLE_SIGNALS();
    LOCK();
    if (!GC_is_initialized) GC_init_inner();
    /* Do our share of marking work */
      if (GC_incremental && !GC_dont_gc) {
        ENTER_GC();
	GC_collect_a_little_inner(1);
        EXIT_GC();
      }
    /* First see if we can reclaim a page of objects waiting to be */
    /* reclaimed.						   */
    {
	struct hblk ** rlh = ok -> ok_reclaim_list;
	struct hblk * hbp;
	hdr * hhdr;

	rlh += lw;
    	while ((hbp = *rlh) != 0) {
            hhdr = HDR(hbp);
            *rlh = hhdr -> hb_next;
	    hhdr -> hb_last_reclaimed = (unsigned short) GC_gc_no;
#	    ifdef PARALLEL_MARK
		{
		  signed_word my_words_allocd_tmp = GC_words_allocd_tmp;

		  GC_ASSERT(my_words_allocd_tmp >= 0);
		  /* We only decrement it while holding the GC lock.	*/
		  /* Thus we can't accidentally adjust it down in more	*/
		  /* than one thread simultaneously.			*/
		  if (my_words_allocd_tmp != 0) {
		    (void)GC_atomic_add(
				(volatile GC_word *)(&GC_words_allocd_tmp),
				(GC_word)(-my_words_allocd_tmp));
		    GC_words_allocd += my_words_allocd_tmp;
		  }
		}
		GC_acquire_mark_lock();
		++ GC_fl_builder_count;
		UNLOCK();
		ENABLE_SIGNALS();
		GC_release_mark_lock();
#	    endif
	    op = GC_reclaim_generic(hbp, hhdr, lw,
				    ok -> ok_init, 0 COUNT_ARG);
            if (op != 0) {
#	      ifdef NEED_TO_COUNT
		/* We are neither gathering statistics, nor marking in	*/
		/* parallel.  Thus GC_reclaim_generic doesn't count	*/
		/* for us.						*/
    		for (p = op; p != 0; p = obj_link(p)) {
        	  my_words_allocd += lw;
		}
#	      endif
#	      if defined(GATHERSTATS)
	        /* We also reclaimed memory, so we need to adjust 	*/
	        /* that count.						*/
		/* This should be atomic, so the results may be		*/
		/* inaccurate.						*/
		GC_mem_found += my_words_allocd;
#	      endif
#	      ifdef PARALLEL_MARK
		*result = op;
		(void)GC_atomic_add(
				(volatile GC_word *)(&GC_words_allocd_tmp),
				(GC_word)(my_words_allocd));
		GC_acquire_mark_lock();
		-- GC_fl_builder_count;
		if (GC_fl_builder_count == 0) GC_notify_all_builder();
		GC_release_mark_lock();
		(void) GC_clear_stack(0);
		return;
#	      else
	        GC_words_allocd += my_words_allocd;
	        goto out;
#	      endif
	    }
#	    ifdef PARALLEL_MARK
	      GC_acquire_mark_lock();
	      -- GC_fl_builder_count;
	      if (GC_fl_builder_count == 0) GC_notify_all_builder();
	      GC_release_mark_lock();
	      DISABLE_SIGNALS();
	      LOCK();
	      /* GC lock is needed for reclaim list access.	We	*/
	      /* must decrement fl_builder_count before reaquiring GC	*/
	      /* lock.  Hopefully this path is rare.			*/
#	    endif
    	}
    }
    /* Next try to use prefix of global free list if there is one.	*/
    /* We don't refill it, but we need to use it up before allocating	*/
    /* a new block ourselves.						*/
      opp = &(GC_obj_kinds[k].ok_freelist[lw]);
      if ( (op = *opp) != 0 ) {
	*opp = 0;
        my_words_allocd = 0;
        for (p = op; p != 0; p = obj_link(p)) {
          my_words_allocd += lw;
          if (my_words_allocd >= BODY_SZ) {
            *opp = obj_link(p);
            obj_link(p) = 0;
            break;
	  }
        }
	GC_words_allocd += my_words_allocd;
	goto out;
      }
    /* Next try to allocate a new block worth of objects of this size.	*/
    {
	struct hblk *h = GC_allochblk(lw, k, 0);
	if (h != 0) {
	  if (IS_UNCOLLECTABLE(k)) GC_set_hdr_marks(HDR(h));
	  GC_words_allocd += BYTES_TO_WORDS(HBLKSIZE)
			       - BYTES_TO_WORDS(HBLKSIZE) % lw;
#	  ifdef PARALLEL_MARK
	    GC_acquire_mark_lock();
	    ++ GC_fl_builder_count;
	    UNLOCK();
	    ENABLE_SIGNALS();
	    GC_release_mark_lock();
#	  endif

	  op = GC_build_fl(h, lw, ok -> ok_init, 0);
#	  ifdef PARALLEL_MARK
	    *result = op;
	    GC_acquire_mark_lock();
	    -- GC_fl_builder_count;
	    if (GC_fl_builder_count == 0) GC_notify_all_builder();
	    GC_release_mark_lock();
	    (void) GC_clear_stack(0);
	    return;
#	  else
	    goto out;
#	  endif
	}
    }
    
    /* As a last attempt, try allocating a single object.  Note that	*/
    /* this may trigger a collection or expand the heap.		*/
      op = GC_generic_malloc_inner(lb, k);
      if (0 != op) obj_link(op) = 0;
    
  out:
    *result = op;
    UNLOCK();
    ENABLE_SIGNALS();
    (void) GC_clear_stack(0);
}

GC_PTR GC_malloc_many(size_t lb)
{
    ptr_t result;
    GC_generic_malloc_many(lb, NORMAL, &result);
    return result;
}

/* Note that the "atomic" version of this would be unsafe, since the	*/
/* links would not be seen by the collector.				*/
# endif

/* Allocate lb bytes of pointerful, traced, but not collectable data */
# ifdef __STDC__
    GC_PTR GC_malloc_uncollectable(size_t lb)
# else
    GC_PTR GC_malloc_uncollectable(lb)
    size_t lb;
# endif
{
register ptr_t op;
register ptr_t *opp;
register word lw;
DCL_LOCK_STATE;

    if( SMALL_OBJ(lb) ) {
#       ifdef MERGE_SIZES
	  if (EXTRA_BYTES != 0 && lb != 0) lb--;
	    	  /* We don't need the extra byte, since this won't be	*/
	    	  /* collected anyway.					*/
	  lw = GC_size_map[lb];
#	else
	  lw = ALIGNED_WORDS(lb);
#       endif
	opp = &(GC_uobjfreelist[lw]);
	FASTLOCK();
        if( FASTLOCK_SUCCEEDED() && (op = *opp) != 0 ) {
            /* See above comment on signals.	*/
            *opp = obj_link(op);
            obj_link(op) = 0;
            GC_words_allocd += lw;
            /* Mark bit ws already set on free list.  It will be	*/
	    /* cleared only temporarily during a collection, as a 	*/
	    /* result of the normal free list mark bit clearing.	*/
            GC_non_gc_bytes += WORDS_TO_BYTES(lw);
            FASTUNLOCK();
            return((GC_PTR) op);
        }
        FASTUNLOCK();
        op = (ptr_t)GC_generic_malloc((word)lb, UNCOLLECTABLE);
    } else {
	op = (ptr_t)GC_generic_malloc((word)lb, UNCOLLECTABLE);
    }
    if (0 == op) return(0);
    /* We don't need the lock here, since we have an undisguised 	*/
    /* pointer.  We do need to hold the lock while we adjust		*/
    /* mark bits.							*/
    {
	register struct hblk * h;
	
	h = HBLKPTR(op);
	lw = HDR(h) -> hb_sz;
	
	DISABLE_SIGNALS();
	LOCK();
	GC_set_mark_bit(op);
	GC_non_gc_bytes += WORDS_TO_BYTES(lw);
	UNLOCK();
	ENABLE_SIGNALS();
	return((GC_PTR) op);
    }
}

#ifdef __STDC__
/* Not well tested nor integrated.	*/
/* Debug version is tricky and currently missing.	*/
#include <limits.h>

GC_PTR GC_memalign(size_t align, size_t lb) 
{ 
    size_t new_lb;
    size_t offset;
    ptr_t result;

#   ifdef ALIGN_DOUBLE
	if (align <= WORDS_TO_BYTES(2) && lb > align) return GC_malloc(lb);
#   endif
    if (align <= WORDS_TO_BYTES(1)) return GC_malloc(lb);
    if (align >= HBLKSIZE/2 || lb >= HBLKSIZE/2) {
        if (align > HBLKSIZE) return GC_oom_fn(LONG_MAX-1024) /* Fail */;
	return GC_malloc(lb <= HBLKSIZE? HBLKSIZE : lb);
	    /* Will be HBLKSIZE aligned.	*/
    }
    /* We could also try to make sure that the real rounded-up object size */
    /* is a multiple of align.  That would be correct up to HBLKSIZE.	   */
    new_lb = lb + align - 1;
    result = GC_malloc(new_lb);
    offset = (word)result % align;
    if (offset != 0) {
	offset = align - offset;
        if (!GC_all_interior_pointers) {
	    if (offset >= VALID_OFFSET_SZ) return GC_malloc(HBLKSIZE);
	    GC_register_displacement(offset);
	}
    }
    result = (GC_PTR) ((ptr_t)result + offset);
    GC_ASSERT((word)result % align == 0);
    return result;
}
#endif 

# ifdef ATOMIC_UNCOLLECTABLE
/* Allocate lb bytes of pointerfree, untraced, uncollectable data 	*/
/* This is normally roughly equivalent to the system malloc.		*/
/* But it may be useful if malloc is redefined.				*/
# ifdef __STDC__
    GC_PTR GC_malloc_atomic_uncollectable(size_t lb)
# else
    GC_PTR GC_malloc_atomic_uncollectable(lb)
    size_t lb;
# endif
{
register ptr_t op;
register ptr_t *opp;
register word lw;
DCL_LOCK_STATE;

    if( SMALL_OBJ(lb) ) {
#       ifdef MERGE_SIZES
	  if (EXTRA_BYTES != 0 && lb != 0) lb--;
	    	  /* We don't need the extra byte, since this won't be	*/
	    	  /* collected anyway.					*/
	  lw = GC_size_map[lb];
#	else
	  lw = ALIGNED_WORDS(lb);
#       endif
	opp = &(GC_auobjfreelist[lw]);
	FASTLOCK();
        if( FASTLOCK_SUCCEEDED() && (op = *opp) != 0 ) {
            /* See above comment on signals.	*/
            *opp = obj_link(op);
            obj_link(op) = 0;
            GC_words_allocd += lw;
	    /* Mark bit was already set while object was on free list. */
            GC_non_gc_bytes += WORDS_TO_BYTES(lw);
            FASTUNLOCK();
            return((GC_PTR) op);
        }
        FASTUNLOCK();
        op = (ptr_t)GC_generic_malloc((word)lb, AUNCOLLECTABLE);
    } else {
	op = (ptr_t)GC_generic_malloc((word)lb, AUNCOLLECTABLE);
    }
    if (0 == op) return(0);
    /* We don't need the lock here, since we have an undisguised 	*/
    /* pointer.  We do need to hold the lock while we adjust		*/
    /* mark bits.							*/
    {
	register struct hblk * h;
	
	h = HBLKPTR(op);
	lw = HDR(h) -> hb_sz;
	
	DISABLE_SIGNALS();
	LOCK();
	GC_set_mark_bit(op);
	GC_non_gc_bytes += WORDS_TO_BYTES(lw);
	UNLOCK();
	ENABLE_SIGNALS();
	return((GC_PTR) op);
    }
}

#endif /* ATOMIC_UNCOLLECTABLE */
OpenPOWER on IntegriCloud