-
Notifications
You must be signed in to change notification settings - Fork 3.8k
/
finalize.c
1153 lines (1036 loc) · 33.2 KB
/
finalize.c
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
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
* Copyright (c) 1991-1996 by Xerox Corporation. All rights reserved.
* Copyright (c) 1996-1999 by Silicon Graphics. 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.
*/
/* Boehm, February 1, 1996 1:19 pm PST */
# define I_HIDE_POINTERS
# include "private/gc_pmark.h"
# ifdef FINALIZE_ON_DEMAND
int GC_finalize_on_demand = 1;
# else
int GC_finalize_on_demand = 0;
# endif
# ifdef JAVA_FINALIZATION
int GC_java_finalization = 1;
# else
int GC_java_finalization = 0;
# endif
/* Type of mark procedure used for marking from finalizable object. */
/* This procedure normally does not mark the object, only its */
/* descendents. */
typedef void finalization_mark_proc(/* ptr_t finalizable_obj_ptr */);
# define HASH3(addr,size,log_size) \
((((word)(addr) >> 3) ^ ((word)(addr) >> (3+(log_size)))) \
& ((size) - 1))
#define HASH2(addr,log_size) HASH3(addr, 1 << log_size, log_size)
struct hash_chain_entry {
word hidden_key;
struct hash_chain_entry * next;
};
unsigned GC_finalization_failures = 0;
/* Number of finalization requests that failed for lack of memory. */
struct disappearing_link {
struct hash_chain_entry prolog;
# define dl_hidden_link prolog.hidden_key
/* Field to be cleared. */
# define dl_next(x) (struct disappearing_link *)((x) -> prolog.next)
# define dl_set_next(x,y) (x) -> prolog.next = (struct hash_chain_entry *)(y)
word dl_hidden_obj; /* Pointer to object base */
};
struct dl_hashtbl_s {
struct disappearing_link **head;
signed_word log_size;
word entries;
};
/* Forward decls. */
static int GC_register_disappearing_link_inner(struct dl_hashtbl_s *dl_hashtbl, GC_PTR * link, GC_PTR obj);
static int GC_unregister_disappearing_link_inner(struct dl_hashtbl_s *dl_hashtbl, GC_PTR * link);
static struct dl_hashtbl_s GC_dl_hashtbl = {
/* head */ NULL, /* log_size */ -1, /* entries */ 0 };
static struct dl_hashtbl_s GC_ll_hashtbl = { NULL, -1, 0 };
static struct finalizable_object {
struct hash_chain_entry prolog;
# define fo_hidden_base prolog.hidden_key
/* Pointer to object base. */
/* No longer hidden once object */
/* is on finalize_now queue. */
# define fo_next(x) (struct finalizable_object *)((x) -> prolog.next)
# define fo_set_next(x,y) (x) -> prolog.next = (struct hash_chain_entry *)(y)
GC_finalization_proc fo_fn; /* Finalizer. */
ptr_t fo_client_data;
word fo_object_size; /* In bytes. */
finalization_mark_proc * fo_mark_proc; /* Mark-through procedure */
} **fo_head = 0;
struct finalizable_object * GC_finalize_now = 0;
/* LIst of objects that should be finalized now. */
static signed_word log_fo_table_size = -1;
word GC_fo_entries = 0;
void GC_push_finalizer_structures GC_PROTO((void))
{
GC_push_all((ptr_t)(&GC_ll_hashtbl.head),
(ptr_t)(&GC_ll_hashtbl.head) + sizeof(word));
GC_push_all((ptr_t)(&GC_dl_hashtbl.head),
(ptr_t)(&GC_dl_hashtbl.head) + sizeof(word));
GC_push_all((ptr_t)(&fo_head), (ptr_t)(&fo_head) + sizeof(word));
GC_push_all((ptr_t)(&GC_finalize_now),
(ptr_t)(&GC_finalize_now) + sizeof(word));
}
/* Double the size of a hash table. *size_ptr is the log of its current */
/* size. May be a noop. */
/* *table is a pointer to an array of hash headers. If we succeed, we */
/* update both *table and *log_size_ptr. */
/* Lock is held. Signals are disabled. */
void GC_grow_table(table, log_size_ptr)
struct hash_chain_entry ***table;
signed_word * log_size_ptr;
{
register word i;
register struct hash_chain_entry *p;
int log_old_size = *log_size_ptr;
register int log_new_size = log_old_size + 1;
word old_size = ((log_old_size == -1)? 0: (1 << log_old_size));
register word new_size = 1 << log_new_size;
struct hash_chain_entry **new_table = (struct hash_chain_entry **)
GC_INTERNAL_MALLOC_IGNORE_OFF_PAGE(
(size_t)new_size * sizeof(struct hash_chain_entry *), NORMAL);
if (new_table == 0) {
if (table == 0) {
ABORT("Insufficient space for initial table allocation");
} else {
return;
}
}
for (i = 0; i < old_size; i++) {
p = (*table)[i];
while (p != 0) {
register ptr_t real_key = (ptr_t)REVEAL_POINTER(p -> hidden_key);
register struct hash_chain_entry *next = p -> next;
register int new_hash = HASH3(real_key, new_size, log_new_size);
p -> next = new_table[new_hash];
new_table[new_hash] = p;
p = next;
}
}
*log_size_ptr = log_new_size;
*table = new_table;
}
# if defined(__STDC__) || defined(__cplusplus)
int GC_register_disappearing_link(GC_PTR * link)
# else
int GC_register_disappearing_link(link)
GC_PTR * link;
# endif
{
ptr_t base;
base = (ptr_t)GC_base((GC_PTR)link);
if (base == 0)
ABORT("Bad arg to GC_register_disappearing_link");
return(GC_general_register_disappearing_link(link, base));
}
# if defined(__STDC__) || defined(__cplusplus)
int GC_general_register_disappearing_link(GC_PTR * link,
GC_PTR obj)
# else
int GC_general_register_disappearing_link(link, obj)
GC_PTR * link;
GC_PTR obj;
# endif
{
return GC_register_disappearing_link_inner(&GC_dl_hashtbl, link, obj);
}
# if defined(__STDC__) || defined(__cplusplus)
static int GC_register_disappearing_link_inner(struct dl_hashtbl_s *dl_hashtbl, GC_PTR * link,
GC_PTR obj)
# else
static int GC_register_disappearing_link_inner(dl_hashtbl, link, obj)
struct dl_hashtbl_s *dl_hashtbl
GC_PTR * link;
GC_PTR obj;
# endif
{
struct disappearing_link *curr_dl;
int index;
struct disappearing_link * new_dl;
DCL_LOCK_STATE;
if ((word)link & (ALIGNMENT-1))
ABORT("Bad arg to GC_general_register_disappearing_link");
# ifdef THREADS
DISABLE_SIGNALS();
LOCK();
# endif
if (dl_hashtbl -> log_size == -1
|| dl_hashtbl -> entries > ((word)1 << dl_hashtbl -> log_size)) {
# ifndef THREADS
DISABLE_SIGNALS();
# endif
GC_grow_table((struct hash_chain_entry ***)(&dl_hashtbl -> head),
&dl_hashtbl -> log_size);
# ifdef CONDPRINT
if (GC_print_stats) {
GC_printf1("Grew dl table to %lu entries\n",
(unsigned long)(1 << dl_hashtbl -> log_size));
}
# endif
# ifndef THREADS
ENABLE_SIGNALS();
# endif
}
index = HASH2(link, dl_hashtbl -> log_size);
curr_dl = dl_hashtbl -> head[index];
for (curr_dl = dl_hashtbl -> head[index]; curr_dl != 0; curr_dl = dl_next(curr_dl)) {
if (curr_dl -> dl_hidden_link == HIDE_POINTER(link)) {
curr_dl -> dl_hidden_obj = HIDE_POINTER(obj);
# ifdef THREADS
UNLOCK();
ENABLE_SIGNALS();
# endif
return(1);
}
}
new_dl = (struct disappearing_link *)
GC_INTERNAL_MALLOC(sizeof(struct disappearing_link),NORMAL);
if (0 == new_dl) {
# ifdef THREADS
UNLOCK();
ENABLE_SIGNALS();
# endif
new_dl = (struct disappearing_link *)
GC_oom_fn(sizeof(struct disappearing_link));
if (0 == new_dl) {
GC_finalization_failures++;
return(0);
}
/* It's not likely we'll make it here, but ... */
# ifdef THREADS
DISABLE_SIGNALS();
LOCK();
# endif
}
new_dl -> dl_hidden_obj = HIDE_POINTER(obj);
new_dl -> dl_hidden_link = HIDE_POINTER(link);
dl_set_next(new_dl, dl_hashtbl -> head[index]);
dl_hashtbl -> head[index] = new_dl;
dl_hashtbl -> entries++;
# ifdef THREADS
UNLOCK();
ENABLE_SIGNALS();
# endif
return(0);
}
# if defined(__STDC__) || defined(__cplusplus)
int GC_unregister_disappearing_link(GC_PTR * link)
# else
int GC_unregister_disappearing_link(link)
GC_PTR * link;
# endif
{
return GC_unregister_disappearing_link_inner(&GC_dl_hashtbl, link);
}
# if defined(__STDC__) || defined(__cplusplus)
static int GC_unregister_disappearing_link_inner(struct dl_hashtbl_s *dl_hashtbl, GC_PTR * link)
# else
static int GC_unregister_disappearing_link_inner(dl_hashtbl, link)
struct dl_hashtbl_s *dl_hashtbl;
GC_PTR * link;
# endif
{
struct disappearing_link *curr_dl, *prev_dl;
int index;
DCL_LOCK_STATE;
DISABLE_SIGNALS();
LOCK();
index = HASH2(link, dl_hashtbl->log_size);
if (((unsigned long)link & (ALIGNMENT-1))) goto out;
prev_dl = 0; curr_dl = dl_hashtbl -> head[index];
while (curr_dl != 0) {
if (curr_dl -> dl_hidden_link == HIDE_POINTER(link)) {
if (prev_dl == 0) {
dl_hashtbl -> head[index] = dl_next(curr_dl);
} else {
dl_set_next(prev_dl, dl_next(curr_dl));
}
dl_hashtbl -> entries--;
UNLOCK();
ENABLE_SIGNALS();
# ifdef DBG_HDRS_ALL
dl_set_next(curr_dl, 0);
# else
GC_free((GC_PTR)curr_dl);
# endif
return(1);
}
prev_dl = curr_dl;
curr_dl = dl_next(curr_dl);
}
out:
UNLOCK();
ENABLE_SIGNALS();
return(0);
}
/* toggleref support */
typedef struct {
GC_PTR strong_ref;
GC_hidden_pointer weak_ref;
} GCToggleRef;
static int (*GC_toggleref_callback) (GC_PTR obj);
static GCToggleRef *GC_toggleref_array;
static int GC_toggleref_array_size;
static int GC_toggleref_array_capacity;
void
GC_process_togglerefs (void)
{
int i, w;
int toggle_ref_counts [3] = { 0, 0, 0 };
for (i = w = 0; i < GC_toggleref_array_size; ++i) {
int res;
GCToggleRef r = GC_toggleref_array [i];
GC_PTR obj;
if (r.strong_ref)
obj = r.strong_ref;
else if (r.weak_ref)
obj = REVEAL_POINTER (r.weak_ref);
else
continue;
res = GC_toggleref_callback (obj);
++toggle_ref_counts [res];
switch (res) {
case 0:
break;
case 1:
GC_toggleref_array [w].strong_ref = obj;
GC_toggleref_array [w].weak_ref = (GC_hidden_pointer)NULL;
++w;
break;
case 2:
GC_toggleref_array [w].strong_ref = NULL;
GC_toggleref_array [w].weak_ref = HIDE_POINTER (obj);
++w;
break;
default:
ABORT("Invalid callback result");
}
}
for (i = w; i < GC_toggleref_array_size; ++i) {
GC_toggleref_array [w].strong_ref = NULL;
GC_toggleref_array [w].weak_ref = (GC_hidden_pointer)NULL;
}
GC_toggleref_array_size = w;
}
static void push_and_mark_object (GC_PTR p)
{
hdr * hhdr = HDR(p);
PUSH_OBJ((word *)p, hhdr, GC_mark_stack_top,
&(GC_mark_stack[GC_mark_stack_size]));
while (!GC_mark_stack_empty()) MARK_FROM_MARK_STACK();
GC_set_mark_bit (p);
if (GC_mark_state != MS_NONE)
while (!GC_mark_some((ptr_t)0)) {}
}
static void GC_mark_togglerefs ()
{
int i;
if (!GC_toggleref_array)
return;
GC_set_mark_bit (GC_toggleref_array);
for (i = 0; i < GC_toggleref_array_size; ++i) {
if (GC_toggleref_array [i].strong_ref) {
GC_PTR object = GC_toggleref_array [i].strong_ref;
push_and_mark_object (object);
}
}
}
static void GC_clear_togglerefs ()
{
int i;
for (i = 0; i < GC_toggleref_array_size; ++i) {
if (GC_toggleref_array [i].weak_ref) {
GC_PTR object = REVEAL_POINTER (GC_toggleref_array [i].weak_ref);
if (!GC_is_marked (object)) {
GC_toggleref_array [i].weak_ref = (GC_hidden_pointer)NULL; /* We defer compaction to only happen on the callback step. */
} else {
/*No need to copy, boehm is non-moving */
}
}
}
}
void GC_toggleref_register_callback(int (*proccess_toggleref) (GC_PTR obj))
{
GC_toggleref_callback = proccess_toggleref;
}
static void
ensure_toggleref_capacity (int capacity)
{
if (!GC_toggleref_array) {
GC_toggleref_array_capacity = 32;
GC_toggleref_array = (GCToggleRef *) GC_INTERNAL_MALLOC (GC_toggleref_array_capacity * sizeof (GCToggleRef), NORMAL);
}
if (GC_toggleref_array_size + capacity >= GC_toggleref_array_capacity) {
GCToggleRef *tmp;
int old_capacity = GC_toggleref_array_capacity;
while (GC_toggleref_array_capacity < GC_toggleref_array_size + capacity)
GC_toggleref_array_capacity *= 2;
tmp = (GCToggleRef *) GC_INTERNAL_MALLOC (GC_toggleref_array_capacity * sizeof (GCToggleRef), NORMAL);
memcpy (tmp, GC_toggleref_array, GC_toggleref_array_size * sizeof (GCToggleRef));
GC_free((GC_PTR)GC_toggleref_array);
GC_toggleref_array = tmp;
}
}
void
GC_toggleref_add (GC_PTR object, int strong_ref)
{
DCL_LOCK_STATE;
# ifdef THREADS
DISABLE_SIGNALS();
LOCK();
# endif
if (!GC_toggleref_callback)
goto end;
ensure_toggleref_capacity (1);
GC_toggleref_array [GC_toggleref_array_size].strong_ref = strong_ref ? object : NULL;
GC_toggleref_array [GC_toggleref_array_size].weak_ref = strong_ref ? (GC_hidden_pointer)NULL : HIDE_POINTER (object);
++GC_toggleref_array_size;
end:
# ifdef THREADS
UNLOCK();
ENABLE_SIGNALS();
# endif
}
# if defined(__STDC__) || defined(__cplusplus)
int GC_register_long_link(GC_PTR * link, GC_PTR obj)
# else
int GC_register_long_link(link, obj)
GC_PTR * link;
GC_PTR obj;
# endif
{
return GC_register_disappearing_link_inner(&GC_ll_hashtbl, link, obj);
}
# if defined(__STDC__) || defined(__cplusplus)
int GC_unregister_long_link(GC_PTR * link)
# else
int GC_unregister_long_link(link)
GC_PTR * link;
# endif
{
return GC_unregister_disappearing_link_inner(&GC_ll_hashtbl, link);
}
/* Possible finalization_marker procedures. Note that mark stack */
/* overflow is handled by the caller, and is not a disaster. */
GC_API void GC_normal_finalize_mark_proc(p)
ptr_t p;
{
hdr * hhdr = HDR(p);
PUSH_OBJ((word *)p, hhdr, GC_mark_stack_top,
&(GC_mark_stack[GC_mark_stack_size]));
}
/* This only pays very partial attention to the mark descriptor. */
/* It does the right thing for normal and atomic objects, and treats */
/* most others as normal. */
GC_API void GC_ignore_self_finalize_mark_proc(p)
ptr_t p;
{
hdr * hhdr = HDR(p);
word descr = hhdr -> hb_descr;
ptr_t q, r;
ptr_t scan_limit;
ptr_t target_limit = p + WORDS_TO_BYTES(hhdr -> hb_sz) - 1;
if ((descr & GC_DS_TAGS) == GC_DS_LENGTH) {
scan_limit = p + descr - sizeof(word);
} else {
scan_limit = target_limit + 1 - sizeof(word);
}
for (q = p; q <= scan_limit; q += ALIGNMENT) {
r = *(ptr_t *)q;
if (r < p || r > target_limit) {
GC_PUSH_ONE_HEAP((word)r, q);
}
}
}
/*ARGSUSED*/
GC_API void GC_null_finalize_mark_proc(p)
ptr_t p;
{
}
/* Register a finalization function. See gc.h for details. */
/* in the nonthreads case, we try to avoid disabling signals, */
/* since it can be expensive. Threads packages typically */
/* make it cheaper. */
/* The last parameter is a procedure that determines */
/* marking for finalization ordering. Any objects marked */
/* by that procedure will be guaranteed to not have been */
/* finalized when this finalizer is invoked. */
GC_API void GC_register_finalizer_inner(obj, fn, cd, ofn, ocd, mp)
GC_PTR obj;
GC_finalization_proc fn;
GC_PTR cd;
GC_finalization_proc * ofn;
GC_PTR * ocd;
finalization_mark_proc * mp;
{
ptr_t base;
struct finalizable_object * curr_fo, * prev_fo;
int index;
struct finalizable_object *new_fo;
hdr *hhdr;
DCL_LOCK_STATE;
# ifdef THREADS
DISABLE_SIGNALS();
LOCK();
# endif
if (log_fo_table_size == -1
|| GC_fo_entries > ((word)1 << log_fo_table_size)) {
# ifndef THREADS
DISABLE_SIGNALS();
# endif
GC_grow_table((struct hash_chain_entry ***)(&fo_head),
&log_fo_table_size);
# ifdef CONDPRINT
if (GC_print_stats) {
GC_printf1("Grew fo table to %lu entries\n",
(unsigned long)(1 << log_fo_table_size));
}
# endif
# ifndef THREADS
ENABLE_SIGNALS();
# endif
}
/* in the THREADS case signals are disabled and we hold allocation */
/* lock; otherwise neither is true. Proceed carefully. */
base = (ptr_t)obj;
index = HASH2(base, log_fo_table_size);
prev_fo = 0; curr_fo = fo_head[index];
while (curr_fo != 0) {
if (curr_fo -> fo_hidden_base == HIDE_POINTER(base)) {
/* Interruption by a signal in the middle of this */
/* should be safe. The client may see only *ocd */
/* updated, but we'll declare that to be his */
/* problem. */
if (ocd) *ocd = (GC_PTR) curr_fo -> fo_client_data;
if (ofn) *ofn = curr_fo -> fo_fn;
/* Delete the structure for base. */
if (prev_fo == 0) {
fo_head[index] = fo_next(curr_fo);
} else {
fo_set_next(prev_fo, fo_next(curr_fo));
}
if (fn == 0) {
GC_fo_entries--;
/* May not happen if we get a signal. But a high */
/* estimate will only make the table larger than */
/* necessary. */
# if !defined(THREADS) && !defined(DBG_HDRS_ALL)
GC_free((GC_PTR)curr_fo);
# endif
} else {
curr_fo -> fo_fn = fn;
curr_fo -> fo_client_data = (ptr_t)cd;
curr_fo -> fo_mark_proc = mp;
/* Reinsert it. We deleted it first to maintain */
/* consistency in the event of a signal. */
if (prev_fo == 0) {
fo_head[index] = curr_fo;
} else {
fo_set_next(prev_fo, curr_fo);
}
}
# ifdef THREADS
UNLOCK();
ENABLE_SIGNALS();
# endif
return;
}
prev_fo = curr_fo;
curr_fo = fo_next(curr_fo);
}
if (ofn) *ofn = 0;
if (ocd) *ocd = 0;
if (fn == 0) {
# ifdef THREADS
UNLOCK();
ENABLE_SIGNALS();
# endif
return;
}
GET_HDR(base, hhdr);
if (0 == hhdr) {
/* We won't collect it, hence finalizer wouldn't be run. */
# ifdef THREADS
UNLOCK();
ENABLE_SIGNALS();
# endif
return;
}
new_fo = (struct finalizable_object *)
GC_INTERNAL_MALLOC(sizeof(struct finalizable_object),NORMAL);
if (0 == new_fo) {
# ifdef THREADS
UNLOCK();
ENABLE_SIGNALS();
# endif
new_fo = (struct finalizable_object *)
GC_oom_fn(sizeof(struct finalizable_object));
if (0 == new_fo) {
GC_finalization_failures++;
return;
}
/* It's not likely we'll make it here, but ... */
# ifdef THREADS
DISABLE_SIGNALS();
LOCK();
# endif
}
new_fo -> fo_hidden_base = (word)HIDE_POINTER(base);
new_fo -> fo_fn = fn;
new_fo -> fo_client_data = (ptr_t)cd;
new_fo -> fo_object_size = hhdr -> hb_sz;
new_fo -> fo_mark_proc = mp;
fo_set_next(new_fo, fo_head[index]);
GC_fo_entries++;
fo_head[index] = new_fo;
# ifdef THREADS
UNLOCK();
ENABLE_SIGNALS();
# endif
}
# if defined(__STDC__)
void GC_register_finalizer(void * obj,
GC_finalization_proc fn, void * cd,
GC_finalization_proc *ofn, void ** ocd)
# else
void GC_register_finalizer(obj, fn, cd, ofn, ocd)
GC_PTR obj;
GC_finalization_proc fn;
GC_PTR cd;
GC_finalization_proc * ofn;
GC_PTR * ocd;
# endif
{
GC_register_finalizer_inner(obj, fn, cd, ofn,
ocd, GC_normal_finalize_mark_proc);
}
# if defined(__STDC__)
void GC_register_finalizer_ignore_self(void * obj,
GC_finalization_proc fn, void * cd,
GC_finalization_proc *ofn, void ** ocd)
# else
void GC_register_finalizer_ignore_self(obj, fn, cd, ofn, ocd)
GC_PTR obj;
GC_finalization_proc fn;
GC_PTR cd;
GC_finalization_proc * ofn;
GC_PTR * ocd;
# endif
{
GC_register_finalizer_inner(obj, fn, cd, ofn,
ocd, GC_ignore_self_finalize_mark_proc);
}
# if defined(__STDC__)
void GC_register_finalizer_no_order(void * obj,
GC_finalization_proc fn, void * cd,
GC_finalization_proc *ofn, void ** ocd)
# else
void GC_register_finalizer_no_order(obj, fn, cd, ofn, ocd)
GC_PTR obj;
GC_finalization_proc fn;
GC_PTR cd;
GC_finalization_proc * ofn;
GC_PTR * ocd;
# endif
{
GC_register_finalizer_inner(obj, fn, cd, ofn,
ocd, GC_null_finalize_mark_proc);
}
#ifndef NO_DEBUGGING
static void GC_dump_finalization_links(struct dl_hashtbl_s *dl_hashtbl)
{
struct disappearing_link *curr_dl;
ptr_t real_ptr, real_link;
size_t dl_size = dl_hashtbl->log_size == -1 ? 0 :
1 << dl_hashtbl->log_size;
int i;
for (i = 0; i < dl_size; i++) {
for (curr_dl = dl_hashtbl -> head[i]; curr_dl != 0;
curr_dl = dl_next(curr_dl)) {
real_ptr = (ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_obj);
real_link = (ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_link);
GC_printf2("Object: %lx, link: %lx\n", real_ptr, real_link);
}
}
}
void GC_dump_finalization()
{
struct finalizable_object * curr_fo;
ptr_t real_ptr;
int fo_size = (log_fo_table_size == -1 ) ? 0 : (1 << log_fo_table_size);
int i;
GC_printf0("Disappearing (short) links:\n");
GC_dump_finalization_links(&GC_dl_hashtbl);
GC_printf0("Disappearing long links:\n");
GC_dump_finalization_links(&GC_ll_hashtbl);
GC_printf0("Finalizers:\n");
for (i = 0; i < fo_size; i++) {
for (curr_fo = fo_head[i]; curr_fo != 0; curr_fo = fo_next(curr_fo)) {
real_ptr = (ptr_t)REVEAL_POINTER(curr_fo -> fo_hidden_base);
GC_printf1("Finalizable object: 0x%lx\n", real_ptr);
}
}
}
#endif
static void GC_make_disappearing_links_disappear(struct dl_hashtbl_s *dl_hashtbl)
{
struct disappearing_link * curr_dl, * prev_dl, * next_dl;
ptr_t real_ptr, real_link;
register int i;
int dl_size = (dl_hashtbl -> log_size == -1 ) ? 0 : (1 << dl_hashtbl -> log_size);
for (i = 0; i < dl_size; i++) {
curr_dl = dl_hashtbl -> head[i];
prev_dl = 0;
while (curr_dl != 0) {
real_ptr = (ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_obj);
real_link = (ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_link);
if (!GC_is_marked(real_ptr)) {
*(word *)real_link = 0;
next_dl = dl_next(curr_dl);
if (prev_dl == 0) {
dl_hashtbl -> head[i] = next_dl;
} else {
dl_set_next(prev_dl, next_dl);
}
GC_clear_mark_bit((ptr_t)curr_dl);
dl_hashtbl -> entries--;
curr_dl = next_dl;
} else {
prev_dl = curr_dl;
curr_dl = dl_next(curr_dl);
}
}
}
}
static void GC_remove_dangling_disappearing_links(struct dl_hashtbl_s *dl_hashtbl)
{
struct disappearing_link * curr_dl, * prev_dl, * next_dl;
ptr_t real_ptr, real_link;
register int i;
int dl_size = (dl_hashtbl -> log_size == -1 ) ? 0 : (1 << dl_hashtbl -> log_size);
for (i = 0; i < dl_size; i++) {
curr_dl = dl_hashtbl -> head[i];
prev_dl = 0;
while (curr_dl != 0) {
real_link = GC_base((ptr_t)REVEAL_POINTER(curr_dl -> dl_hidden_link));
if (real_link != 0 && !GC_is_marked(real_link)) {
next_dl = dl_next(curr_dl);
if (prev_dl == 0) {
dl_hashtbl -> head[i] = next_dl;
} else {
dl_set_next(prev_dl, next_dl);
}
GC_clear_mark_bit((ptr_t)curr_dl);
dl_hashtbl -> entries--;
curr_dl = next_dl;
} else {
prev_dl = curr_dl;
curr_dl = dl_next(curr_dl);
}
}
}
}
/* Called with world stopped. Cause disappearing links to disappear, */
/* and invoke finalizers. */
void GC_finalize()
{
struct finalizable_object * curr_fo, * prev_fo, * next_fo;
ptr_t real_ptr;
register int i;
int fo_size = (log_fo_table_size == -1 ) ? 0 : (1 << log_fo_table_size);
GC_mark_togglerefs();
/* Make non-tracking disappearing links disappear */
GC_make_disappearing_links_disappear(&GC_dl_hashtbl);
/* Mark all objects reachable via chains of 1 or more pointers */
/* from finalizable objects. */
GC_ASSERT(GC_mark_state == MS_NONE);
for (i = 0; i < fo_size; i++) {
for (curr_fo = fo_head[i]; curr_fo != 0; curr_fo = fo_next(curr_fo)) {
real_ptr = (ptr_t)REVEAL_POINTER(curr_fo -> fo_hidden_base);
if (!GC_is_marked(real_ptr)) {
GC_MARKED_FOR_FINALIZATION(real_ptr);
GC_MARK_FO(real_ptr, curr_fo -> fo_mark_proc);
if (GC_is_marked(real_ptr)) {
WARN("Finalization cycle involving %lx\n", real_ptr);
}
}
}
}
/* Enqueue for finalization all objects that are still */
/* unreachable. */
GC_words_finalized = 0;
for (i = 0; i < fo_size; i++) {
curr_fo = fo_head[i];
prev_fo = 0;
while (curr_fo != 0) {
real_ptr = (ptr_t)REVEAL_POINTER(curr_fo -> fo_hidden_base);
if (!GC_is_marked(real_ptr)) {
if (!GC_java_finalization) {
GC_set_mark_bit(real_ptr);
}
/* Delete from hash table */
next_fo = fo_next(curr_fo);
if (prev_fo == 0) {
fo_head[i] = next_fo;
} else {
fo_set_next(prev_fo, next_fo);
}
GC_fo_entries--;
/* Add to list of objects awaiting finalization. */
fo_set_next(curr_fo, GC_finalize_now);
GC_finalize_now = curr_fo;
/* unhide object pointer so any future collections will */
/* see it. */
curr_fo -> fo_hidden_base =
(word) REVEAL_POINTER(curr_fo -> fo_hidden_base);
GC_words_finalized +=
ALIGNED_WORDS(curr_fo -> fo_object_size)
+ ALIGNED_WORDS(sizeof(struct finalizable_object));
GC_ASSERT(GC_is_marked(GC_base((ptr_t)curr_fo)));
curr_fo = next_fo;
} else {
prev_fo = curr_fo;
curr_fo = fo_next(curr_fo);
}
}
}
if (GC_java_finalization) {
/* make sure we mark everything reachable from objects finalized
using the no_order mark_proc */
for (curr_fo = GC_finalize_now;
curr_fo != NULL; curr_fo = fo_next(curr_fo)) {
real_ptr = (ptr_t)curr_fo -> fo_hidden_base;
if (!GC_is_marked(real_ptr)) {
if (curr_fo -> fo_mark_proc == GC_null_finalize_mark_proc) {
GC_MARK_FO(real_ptr, GC_normal_finalize_mark_proc);
}
GC_set_mark_bit(real_ptr);
}
}
}
/* Remove dangling disappearing links. */
GC_remove_dangling_disappearing_links(&GC_dl_hashtbl);
GC_clear_togglerefs ();
/* Make long links disappear and remove dangling ones. */
GC_make_disappearing_links_disappear(&GC_ll_hashtbl);
GC_remove_dangling_disappearing_links(&GC_ll_hashtbl);
}
#ifndef JAVA_FINALIZATION_NOT_NEEDED
/* Enqueue all remaining finalizers to be run - Assumes lock is
* held, and signals are disabled */
void GC_enqueue_all_finalizers()
{
struct finalizable_object * curr_fo, * prev_fo, * next_fo;
ptr_t real_ptr;
register int i;
int fo_size;
fo_size = (log_fo_table_size == -1 ) ? 0 : (1 << log_fo_table_size);
GC_words_finalized = 0;
for (i = 0; i < fo_size; i++) {
curr_fo = fo_head[i];
prev_fo = 0;
while (curr_fo != 0) {
real_ptr = (ptr_t)REVEAL_POINTER(curr_fo -> fo_hidden_base);
GC_MARK_FO(real_ptr, GC_normal_finalize_mark_proc);
GC_set_mark_bit(real_ptr);
/* Delete from hash table */
next_fo = fo_next(curr_fo);
if (prev_fo == 0) {
fo_head[i] = next_fo;
} else {
fo_set_next(prev_fo, next_fo);
}
GC_fo_entries--;
/* Add to list of objects awaiting finalization. */
fo_set_next(curr_fo, GC_finalize_now);
GC_finalize_now = curr_fo;
/* unhide object pointer so any future collections will */
/* see it. */
curr_fo -> fo_hidden_base =
(word) REVEAL_POINTER(curr_fo -> fo_hidden_base);
GC_words_finalized +=
ALIGNED_WORDS(curr_fo -> fo_object_size)
+ ALIGNED_WORDS(sizeof(struct finalizable_object));
curr_fo = next_fo;
}
}
return;
}
/* Invoke all remaining finalizers that haven't yet been run.
* This is needed for strict compliance with the Java standard,
* which can make the runtime guarantee that all finalizers are run.
* Unfortunately, the Java standard implies we have to keep running
* finalizers until there are no more left, a potential infinite loop.
* YUCK.
* Note that this is even more dangerous than the usual Java
* finalizers, in that objects reachable from static variables
* may have been finalized when these finalizers are run.
* Finalizers run at this point must be prepared to deal with a
* mostly broken world.
* This routine is externally callable, so is called without
* the allocation lock.
*/
GC_API void GC_finalize_all()
{
DCL_LOCK_STATE;
DISABLE_SIGNALS();
LOCK();
while (GC_fo_entries > 0) {
GC_enqueue_all_finalizers();
UNLOCK();
ENABLE_SIGNALS();
GC_INVOKE_FINALIZERS();
DISABLE_SIGNALS();
LOCK();