summaryrefslogtreecommitdiff
path: root/boehm-gc/misc.c
blob: 2b69a00055ad63198894228b98ce09be660e908e (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
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
/* 
 * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
 * Copyright (c) 1991-1994 by Xerox Corporation.  All rights reserved.
 * Copyright (c) 1999-2001 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.
 */
/* Boehm, July 31, 1995 5:02 pm PDT */


#include <stdio.h>
#include <limits.h>
#ifndef _WIN32_WCE
#include <signal.h>
#endif

#define I_HIDE_POINTERS	/* To make GC_call_with_alloc_lock visible */
#include "private/gc_pmark.h"

#ifdef GC_SOLARIS_THREADS
# include <sys/syscall.h>
#endif
#if defined(MSWIN32) || defined(MSWINCE)
# define WIN32_LEAN_AND_MEAN
# define NOSERVICE
# include <windows.h>
# include <tchar.h>
#endif

# ifdef THREADS
#   ifdef PCR
#     include "il/PCR_IL.h"
      PCR_Th_ML GC_allocate_ml;
#   else
#     ifdef SRC_M3
	/* Critical section counter is defined in the M3 runtime 	*/
	/* That's all we use.						*/
#     else
#	ifdef GC_SOLARIS_THREADS
	  mutex_t GC_allocate_ml;	/* Implicitly initialized.	*/
#	else
#          if defined(GC_WIN32_THREADS) 
#             if defined(GC_PTHREADS)
		  pthread_mutex_t GC_allocate_ml = PTHREAD_MUTEX_INITIALIZER;
#	      elif defined(GC_DLL)
		 __declspec(dllexport) CRITICAL_SECTION GC_allocate_ml;
#	      else
		 CRITICAL_SECTION GC_allocate_ml;
#	      endif
#          else
#             if defined(GC_PTHREADS) && !defined(GC_SOLARIS_THREADS)
#		if defined(USE_SPIN_LOCK)
	          pthread_t GC_lock_holder = NO_THREAD;
#	        else
		  pthread_mutex_t GC_allocate_ml = PTHREAD_MUTEX_INITIALIZER;
	          pthread_t GC_lock_holder = NO_THREAD;
			/* Used only for assertions, and to prevent	 */
			/* recursive reentry in the system call wrapper. */
#		endif 
#    	      else
	          --> declare allocator lock here
#	      endif
#	   endif
#	endif
#     endif
#   endif
# endif

#if defined(NOSYS) || defined(ECOS)
#undef STACKBASE
#endif

/* Dont unnecessarily call GC_register_main_static_data() in case 	*/
/* dyn_load.c isn't linked in.						*/
#ifdef DYNAMIC_LOADING
# define GC_REGISTER_MAIN_STATIC_DATA() GC_register_main_static_data()
#else
# define GC_REGISTER_MAIN_STATIC_DATA() TRUE
#endif

GC_FAR struct _GC_arrays GC_arrays /* = { 0 } */;


GC_bool GC_debugging_started = FALSE;
	/* defined here so we don't have to load debug_malloc.o */

void (*GC_check_heap) GC_PROTO((void)) = (void (*) GC_PROTO((void)))0;
void (*GC_print_all_smashed) GC_PROTO((void)) = (void (*) GC_PROTO((void)))0;

void (*GC_start_call_back) GC_PROTO((void)) = (void (*) GC_PROTO((void)))0;

ptr_t GC_stackbottom = 0;

#ifdef IA64
  ptr_t GC_register_stackbottom = 0;
#endif

GC_bool GC_dont_gc = 0;

GC_bool GC_dont_precollect = 0;

GC_bool GC_quiet = 0;

GC_bool GC_print_stats = 0;

GC_bool GC_print_back_height = 0;

#ifndef NO_DEBUGGING
  GC_bool GC_dump_regularly = 0;  /* Generate regular debugging dumps. */
#endif

#ifdef KEEP_BACK_PTRS
  long GC_backtraces = 0;	/* Number of random backtraces to 	*/
  				/* generate for each GC.		*/
#endif

#ifdef FIND_LEAK
  int GC_find_leak = 1;
#else
  int GC_find_leak = 0;
#endif

#ifdef ALL_INTERIOR_POINTERS
  int GC_all_interior_pointers = 1;
#else
  int GC_all_interior_pointers = 0;
#endif

long GC_large_alloc_warn_interval = 5;
	/* Interval between unsuppressed warnings.	*/

long GC_large_alloc_warn_suppressed = 0;
	/* Number of warnings suppressed so far.	*/

/*ARGSUSED*/
GC_PTR GC_default_oom_fn GC_PROTO((size_t bytes_requested))
{
    return(0);
}

GC_PTR (*GC_oom_fn) GC_PROTO((size_t bytes_requested)) = GC_default_oom_fn;

extern signed_word GC_mem_found;

void * GC_project2(arg1, arg2)
void *arg1;
void *arg2;
{
  return arg2;
}

# ifdef MERGE_SIZES
    /* Set things up so that GC_size_map[i] >= words(i),		*/
    /* but not too much bigger						*/
    /* and so that size_map contains relatively few distinct entries 	*/
    /* This is stolen from Russ Atkinson's Cedar quantization		*/
    /* alogrithm (but we precompute it).				*/


    void GC_init_size_map()
    {
	register unsigned i;

	/* Map size 0 to something bigger.			*/
	/* This avoids problems at lower levels.		*/
	/* One word objects don't have to be 2 word aligned,	*/
	/* unless we're using mark bytes.	   		*/
	  for (i = 0; i < sizeof(word); i++) {
	      GC_size_map[i] = MIN_WORDS;
	  }
#	  if MIN_WORDS > 1
	    GC_size_map[sizeof(word)] = MIN_WORDS;
#	  else
	    GC_size_map[sizeof(word)] = ROUNDED_UP_WORDS(sizeof(word));
#	  endif
	for (i = sizeof(word) + 1; i <= 8 * sizeof(word); i++) {
	    GC_size_map[i] = ALIGNED_WORDS(i);
	}
	for (i = 8*sizeof(word) + 1; i <= 16 * sizeof(word); i++) {
	      GC_size_map[i] = (ROUNDED_UP_WORDS(i) + 1) & (~1);
	}
#	ifdef GC_GCJ_SUPPORT
	   /* Make all sizes up to 32 words predictable, so that a 	*/
	   /* compiler can statically perform the same computation,	*/
	   /* or at least a computation that results in similar size	*/
	   /* classes.							*/
	   for (i = 16*sizeof(word) + 1; i <= 32 * sizeof(word); i++) {
	      GC_size_map[i] = (ROUNDED_UP_WORDS(i) + 3) & (~3);
	   }
#	endif
	/* We leave the rest of the array to be filled in on demand. */
    }
    
    /* Fill in additional entries in GC_size_map, including the ith one */
    /* We assume the ith entry is currently 0.				*/
    /* Note that a filled in section of the array ending at n always    */
    /* has length at least n/4.						*/
    void GC_extend_size_map(i)
    word i;
    {
        word orig_word_sz = ROUNDED_UP_WORDS(i);
        word word_sz = orig_word_sz;
    	register word byte_sz = WORDS_TO_BYTES(word_sz);
    				/* The size we try to preserve.		*/
    				/* Close to to i, unless this would	*/
    				/* introduce too many distinct sizes.	*/
    	word smaller_than_i = byte_sz - (byte_sz >> 3);
    	word much_smaller_than_i = byte_sz - (byte_sz >> 2);
    	register word low_limit;	/* The lowest indexed entry we 	*/
    					/* initialize.			*/
    	register word j;
    	
    	if (GC_size_map[smaller_than_i] == 0) {
    	    low_limit = much_smaller_than_i;
    	    while (GC_size_map[low_limit] != 0) low_limit++;
    	} else {
    	    low_limit = smaller_than_i + 1;
    	    while (GC_size_map[low_limit] != 0) low_limit++;
    	    word_sz = ROUNDED_UP_WORDS(low_limit);
    	    word_sz += word_sz >> 3;
    	    if (word_sz < orig_word_sz) word_sz = orig_word_sz;
    	}
#	ifdef ALIGN_DOUBLE
	    word_sz += 1;
	    word_sz &= ~1;
#	endif
	if (word_sz > MAXOBJSZ) {
	    word_sz = MAXOBJSZ;
	}
	/* If we can fit the same number of larger objects in a block,	*/
	/* do so.							*/ 
	{
	    size_t number_of_objs = BODY_SZ/word_sz;
	    word_sz = BODY_SZ/number_of_objs;
#	    ifdef ALIGN_DOUBLE
		word_sz &= ~1;
#	    endif
	}
    	byte_sz = WORDS_TO_BYTES(word_sz);
	if (GC_all_interior_pointers) {
	    /* We need one extra byte; don't fill in GC_size_map[byte_sz] */
	    byte_sz--;
	}

    	for (j = low_limit; j <= byte_sz; j++) GC_size_map[j] = word_sz;  
    }
# endif


/*
 * The following is a gross hack to deal with a problem that can occur
 * on machines that are sloppy about stack frame sizes, notably SPARC.
 * Bogus pointers may be written to the stack and not cleared for
 * a LONG time, because they always fall into holes in stack frames
 * that are not written.  We partially address this by clearing
 * sections of the stack whenever we get control.
 */
word GC_stack_last_cleared = 0;	/* GC_no when we last did this */
# ifdef THREADS
#   define BIG_CLEAR_SIZE 2048	/* Clear this much now and then.	*/
#   define SMALL_CLEAR_SIZE 256 /* Clear this much every time.		*/
# endif
# define CLEAR_SIZE 213  /* Granularity for GC_clear_stack_inner */
# define DEGRADE_RATE 50

word GC_min_sp;		/* Coolest stack pointer value from which we've */
			/* already cleared the stack.			*/
			
word GC_high_water;
			/* "hottest" stack pointer value we have seen	*/
			/* recently.  Degrades over time.		*/

word GC_words_allocd_at_reset;

#if defined(ASM_CLEAR_CODE)
  extern ptr_t GC_clear_stack_inner();
#else  
/* Clear the stack up to about limit.  Return arg. */
/*ARGSUSED*/
ptr_t GC_clear_stack_inner(arg, limit)
ptr_t arg;
word limit;
{
    word dummy[CLEAR_SIZE];
    
    BZERO(dummy, CLEAR_SIZE*sizeof(word));
    if ((word)(dummy) COOLER_THAN limit) {
        (void) GC_clear_stack_inner(arg, limit);
    }
    /* Make sure the recursive call is not a tail call, and the bzero	*/
    /* call is not recognized as dead code.				*/
    GC_noop1((word)dummy);
    return(arg);
}
#endif

/* Clear some of the inaccessible part of the stack.  Returns its	*/
/* argument, so it can be used in a tail call position, hence clearing  */
/* another frame.							*/
ptr_t GC_clear_stack(arg)
ptr_t arg;
{
    register word sp = (word)GC_approx_sp();  /* Hotter than actual sp */
#   ifdef THREADS
        word dummy[SMALL_CLEAR_SIZE];
	static unsigned random_no = 0;
       			 	 /* Should be more random than it is ... */
				 /* Used to occasionally clear a bigger	 */
				 /* chunk.				 */
#   endif
    register word limit;
    
#   define SLOP 400
	/* Extra bytes we clear every time.  This clears our own	*/
	/* activation record, and should cause more frequent		*/
	/* clearing near the cold end of the stack, a good thing.	*/
#   define GC_SLOP 4000
	/* We make GC_high_water this much hotter than we really saw   	*/
	/* saw it, to cover for GC noise etc. above our current frame.	*/
#   define CLEAR_THRESHOLD 100000
	/* We restart the clearing process after this many bytes of	*/
	/* allocation.  Otherwise very heavily recursive programs	*/
	/* with sparse stacks may result in heaps that grow almost	*/
	/* without bounds.  As the heap gets larger, collection 	*/
	/* frequency decreases, thus clearing frequency would decrease, */
	/* thus more junk remains accessible, thus the heap gets	*/
	/* larger ...							*/
# ifdef THREADS
    if (++random_no % 13 == 0) {
	limit = sp;
	MAKE_HOTTER(limit, BIG_CLEAR_SIZE*sizeof(word));
        limit &= ~0xf;	/* Make it sufficiently aligned for assembly	*/
        		/* implementations of GC_clear_stack_inner.	*/
	return GC_clear_stack_inner(arg, limit);
    } else {
	BZERO(dummy, SMALL_CLEAR_SIZE*sizeof(word));
	return arg;
    }
# else
    if (GC_gc_no > GC_stack_last_cleared) {
        /* Start things over, so we clear the entire stack again */
        if (GC_stack_last_cleared == 0) GC_high_water = (word) GC_stackbottom;
        GC_min_sp = GC_high_water;
        GC_stack_last_cleared = GC_gc_no;
        GC_words_allocd_at_reset = GC_words_allocd;
    }
    /* Adjust GC_high_water */
        MAKE_COOLER(GC_high_water, WORDS_TO_BYTES(DEGRADE_RATE) + GC_SLOP);
        if (sp HOTTER_THAN GC_high_water) {
            GC_high_water = sp;
        }
        MAKE_HOTTER(GC_high_water, GC_SLOP);
    limit = GC_min_sp;
    MAKE_HOTTER(limit, SLOP);
    if (sp COOLER_THAN limit) {
        limit &= ~0xf;	/* Make it sufficiently aligned for assembly	*/
        		/* implementations of GC_clear_stack_inner.	*/
        GC_min_sp = sp;
        return(GC_clear_stack_inner(arg, limit));
    } else if (WORDS_TO_BYTES(GC_words_allocd - GC_words_allocd_at_reset)
    	       > CLEAR_THRESHOLD) {
    	/* Restart clearing process, but limit how much clearing we do. */
    	GC_min_sp = sp;
    	MAKE_HOTTER(GC_min_sp, CLEAR_THRESHOLD/4);
    	if (GC_min_sp HOTTER_THAN GC_high_water) GC_min_sp = GC_high_water;
    	GC_words_allocd_at_reset = GC_words_allocd;
    }  
    return(arg);
# endif
}


/* Return a pointer to the base address of p, given a pointer to a	*/
/* an address within an object.  Return 0 o.w.				*/
# ifdef __STDC__
    GC_PTR GC_base(GC_PTR p)
# else
    GC_PTR GC_base(p)
    GC_PTR p;
# endif
{
    register word r;
    register struct hblk *h;
    register bottom_index *bi;
    register hdr *candidate_hdr;
    register word limit;
    
    r = (word)p;
    if (!GC_is_initialized) return 0;
    h = HBLKPTR(r);
    GET_BI(r, bi);
    candidate_hdr = HDR_FROM_BI(bi, r);
    if (candidate_hdr == 0) return(0);
    /* If it's a pointer to the middle of a large object, move it	*/
    /* to the beginning.						*/
	while (IS_FORWARDING_ADDR_OR_NIL(candidate_hdr)) {
	   h = FORWARDED_ADDR(h,candidate_hdr);
	   r = (word)h;
	   candidate_hdr = HDR(h);
	}
    if (candidate_hdr -> hb_map == GC_invalid_map) return(0);
    /* Make sure r points to the beginning of the object */
	r &= ~(WORDS_TO_BYTES(1) - 1);
        {
	    register int offset = HBLKDISPL(r);
	    register signed_word sz = candidate_hdr -> hb_sz;
	    register signed_word map_entry;
	      
	    map_entry = MAP_ENTRY((candidate_hdr -> hb_map), offset);
	    if (map_entry > CPP_MAX_OFFSET) {
            	map_entry = (signed_word)(BYTES_TO_WORDS(offset)) % sz;
            }
            r -= WORDS_TO_BYTES(map_entry);
            limit = r + WORDS_TO_BYTES(sz);
	    if (limit > (word)(h + 1)
	        && sz <= BYTES_TO_WORDS(HBLKSIZE)) {
	        return(0);
	    }
	    if ((word)p >= limit) return(0);
	}
    return((GC_PTR)r);
}


/* Return the size of an object, given a pointer to its base.		*/
/* (For small obects this also happens to work from interior pointers,	*/
/* but that shouldn't be relied upon.)					*/
# ifdef __STDC__
    size_t GC_size(GC_PTR p)
# else
    size_t GC_size(p)
    GC_PTR p;
# endif
{
    register int sz;
    register hdr * hhdr = HDR(p);
    
    sz = WORDS_TO_BYTES(hhdr -> hb_sz);
    return(sz);
}

size_t GC_get_heap_size GC_PROTO(())
{
    return ((size_t) GC_heapsize);
}

size_t GC_get_free_bytes GC_PROTO(())
{
    return ((size_t) GC_large_free_bytes);
}

size_t GC_get_bytes_since_gc GC_PROTO(())
{
    return ((size_t) WORDS_TO_BYTES(GC_words_allocd));
}

size_t GC_get_total_bytes GC_PROTO(())
{
    return ((size_t) WORDS_TO_BYTES(GC_words_allocd+GC_words_allocd_before_gc));
}

GC_bool GC_is_initialized = FALSE;

void GC_init()
{
    DCL_LOCK_STATE;
    
    DISABLE_SIGNALS();

#if defined(GC_WIN32_THREADS) && !defined(GC_PTHREADS)
    if (!GC_is_initialized) {
      BOOL (WINAPI *pfn) (LPCRITICAL_SECTION, DWORD) = NULL;
      HMODULE hK32 = GetModuleHandle("kernel32.dll");
      if (hK32)
	  pfn = (BOOL (WINAPI *) (LPCRITICAL_SECTION, DWORD))
		GetProcAddress (hK32,
				"InitializeCriticalSectionAndSpinCount");
      if (pfn)
          pfn(&GC_allocate_ml, 4000);
      else
	  InitializeCriticalSection (&GC_allocate_ml);
    }
#endif /* MSWIN32 */

    LOCK();
    GC_init_inner();
    UNLOCK();
    ENABLE_SIGNALS();

#   if defined(PARALLEL_MARK) || defined(THREAD_LOCAL_ALLOC)
	/* Make sure marker threads and started and thread local */
	/* allocation is initialized, in case we didn't get 	 */
	/* called from GC_init_parallel();			 */
        {
	  extern void GC_init_parallel(void);
	  GC_init_parallel();
	}
#   endif /* PARALLEL_MARK || THREAD_LOCAL_ALLOC */

#   if defined(DYNAMIC_LOADING) && defined(DARWIN)
    {
        /* This must be called WITHOUT the allocation lock held
        and before any threads are created */
        extern void GC_init_dyld();
        GC_init_dyld();
    }
#   endif
}

#if defined(MSWIN32) || defined(MSWINCE)
    CRITICAL_SECTION GC_write_cs;
#endif

#ifdef MSWIN32
    extern void GC_init_win32 GC_PROTO((void));
#endif

extern void GC_setpagesize();


#ifdef MSWIN32
extern GC_bool GC_no_win32_dlls;
#else
# define GC_no_win32_dlls FALSE
#endif

void GC_exit_check GC_PROTO((void))
{
   GC_gcollect();
}

#ifdef SEARCH_FOR_DATA_START
  extern void GC_init_linux_data_start GC_PROTO((void));
#endif

#ifdef UNIX_LIKE

extern void GC_set_and_save_fault_handler GC_PROTO((void (*handler)(int)));

static void looping_handler(sig)
int sig;
{
    GC_err_printf1("Caught signal %d: looping in handler\n", sig);
    for(;;);
}

static GC_bool installed_looping_handler = FALSE;

static void maybe_install_looping_handler()
{
    /* Install looping handler before the write fault handler, so we	*/
    /* handle write faults correctly.					*/
      if (!installed_looping_handler && 0 != GETENV("GC_LOOP_ON_ABORT")) {
        GC_set_and_save_fault_handler(looping_handler);
        installed_looping_handler = TRUE;
      }
}

#else /* !UNIX_LIKE */

# define maybe_install_looping_handler()

#endif

void GC_init_inner()
{
#   if !defined(THREADS) && defined(GC_ASSERTIONS)
        word dummy;
#   endif
    word initial_heap_sz = (word)MINHINCR;
    
    if (GC_is_initialized) return;
#   ifdef PRINTSTATS
      GC_print_stats = 1;
#   endif
#   if defined(MSWIN32) || defined(MSWINCE)
      InitializeCriticalSection(&GC_write_cs);
#   endif
    if (0 != GETENV("GC_PRINT_STATS")) {
      GC_print_stats = 1;
    } 
#   ifndef NO_DEBUGGING
      if (0 != GETENV("GC_DUMP_REGULARLY")) {
        GC_dump_regularly = 1;
      }
#   endif
#   ifdef KEEP_BACK_PTRS
      {
        char * backtraces_string = GETENV("GC_BACKTRACES");
        if (0 != backtraces_string) {
          GC_backtraces = atol(backtraces_string);
	  if (backtraces_string[0] == '\0') GC_backtraces = 1;
        }
      }
#   endif
    if (0 != GETENV("GC_FIND_LEAK")) {
      GC_find_leak = 1;
#     ifdef __STDC__
        atexit(GC_exit_check);
#     endif
    }
    if (0 != GETENV("GC_ALL_INTERIOR_POINTERS")) {
      GC_all_interior_pointers = 1;
    }
    if (0 != GETENV("GC_DONT_GC")) {
      GC_dont_gc = 1;
    }
    if (0 != GETENV("GC_PRINT_BACK_HEIGHT")) {
      GC_print_back_height = 1;
    }
    if (0 != GETENV("GC_NO_BLACKLIST_WARNING")) {
      GC_large_alloc_warn_interval = LONG_MAX;
    }
    {
      char * time_limit_string = GETENV("GC_PAUSE_TIME_TARGET");
      if (0 != time_limit_string) {
        long time_limit = atol(time_limit_string);
        if (time_limit < 5) {
	  WARN("GC_PAUSE_TIME_TARGET environment variable value too small "
	       "or bad syntax: Ignoring\n", 0);
        } else {
	  GC_time_limit = time_limit;
        }
      }
    }
    {
      char * interval_string = GETENV("GC_LARGE_ALLOC_WARN_INTERVAL");
      if (0 != interval_string) {
        long interval = atol(interval_string);
        if (interval <= 0) {
	  WARN("GC_LARGE_ALLOC_WARN_INTERVAL environment variable has "
	       "bad value: Ignoring\n", 0);
        } else {
	  GC_large_alloc_warn_interval = interval;
        }
      }
    }
    maybe_install_looping_handler();
    /* Adjust normal object descriptor for extra allocation.	*/
    if (ALIGNMENT > GC_DS_TAGS && EXTRA_BYTES != 0) {
      GC_obj_kinds[NORMAL].ok_descriptor = ((word)(-ALIGNMENT) | GC_DS_LENGTH);
    }
    GC_setpagesize();
    GC_exclude_static_roots(beginGC_arrays, endGC_arrays);
    GC_exclude_static_roots(beginGC_obj_kinds, endGC_obj_kinds);
#   ifdef SEPARATE_GLOBALS
      GC_exclude_static_roots(beginGC_objfreelist, endGC_objfreelist);
      GC_exclude_static_roots(beginGC_aobjfreelist, endGC_aobjfreelist);
#   endif
#   ifdef MSWIN32
 	GC_init_win32();
#   endif
#   if defined(SEARCH_FOR_DATA_START)
	GC_init_linux_data_start();
#   endif
#   if (defined(NETBSD) || defined(OPENBSD)) && defined(__ELF__)
	GC_init_netbsd_elf();
#   endif
#   if defined(GC_PTHREADS) || defined(GC_SOLARIS_THREADS) \
       || defined(GC_WIN32_THREADS)
        GC_thr_init();
#   endif
#   ifdef GC_SOLARIS_THREADS
	/* We need dirty bits in order to find live stack sections.	*/
        GC_dirty_init();
#   endif
#   if !defined(THREADS) || defined(GC_PTHREADS) || defined(GC_WIN32_THREADS) \
	|| defined(GC_SOLARIS_THREADS)
      if (GC_stackbottom == 0) {
	GC_stackbottom = GC_get_stack_base();
#       if (defined(LINUX) || defined(HPUX)) && defined(IA64)
	  GC_register_stackbottom = GC_get_register_stack_base();
#       endif
      } else {
#       if (defined(LINUX) || defined(HPUX)) && defined(IA64)
	  if (GC_register_stackbottom == 0) {
	    WARN("GC_register_stackbottom should be set with GC_stackbottom", 0);
	    /* The following may fail, since we may rely on	 	*/
	    /* alignment properties that may not hold with a user set	*/
	    /* GC_stackbottom.						*/
	    GC_register_stackbottom = GC_get_register_stack_base();
	  }
#	endif
      }
#   endif
    GC_STATIC_ASSERT(sizeof (ptr_t) == sizeof(word));
    GC_STATIC_ASSERT(sizeof (signed_word) == sizeof(word));
    GC_STATIC_ASSERT(sizeof (struct hblk) == HBLKSIZE);
#   ifndef THREADS
#     if defined(STACK_GROWS_UP) && defined(STACK_GROWS_DOWN)
  	ABORT(
  	  "Only one of STACK_GROWS_UP and STACK_GROWS_DOWN should be defd\n");
#     endif
#     if !defined(STACK_GROWS_UP) && !defined(STACK_GROWS_DOWN)
  	ABORT(
  	  "One of STACK_GROWS_UP and STACK_GROWS_DOWN should be defd\n");
#     endif
#     ifdef STACK_GROWS_DOWN
        GC_ASSERT((word)(&dummy) <= (word)GC_stackbottom);
#     else
        GC_ASSERT((word)(&dummy) >= (word)GC_stackbottom);
#     endif
#   endif
#   if !defined(_AUX_SOURCE) || defined(__GNUC__)
      GC_ASSERT((word)(-1) > (word)0);
      /* word should be unsigned */
#   endif
    GC_ASSERT((signed_word)(-1) < (signed_word)0);
    
    /* Add initial guess of root sets.  Do this first, since sbrk(0)	*/
    /* might be used.							*/
      if (GC_REGISTER_MAIN_STATIC_DATA()) GC_register_data_segments();
    GC_init_headers();
    GC_bl_init();
    GC_mark_init();
    {
	char * sz_str = GETENV("GC_INITIAL_HEAP_SIZE");
	if (sz_str != NULL) {
	  initial_heap_sz = atoi(sz_str);
	  if (initial_heap_sz <= MINHINCR * HBLKSIZE) {
	    WARN("Bad initial heap size %s - ignoring it.\n",
		 sz_str);
	  } 
	  initial_heap_sz = divHBLKSZ(initial_heap_sz);
	}
    }
    {
	char * sz_str = GETENV("GC_MAXIMUM_HEAP_SIZE");
	if (sz_str != NULL) {
	  word max_heap_sz = (word)atol(sz_str);
	  if (max_heap_sz < initial_heap_sz * HBLKSIZE) {
	    WARN("Bad maximum heap size %s - ignoring it.\n",
		 sz_str);
	  } 
	  if (0 == GC_max_retries) GC_max_retries = 2;
	  GC_set_max_heap_size(max_heap_sz);
	}
    }
    if (!GC_expand_hp_inner(initial_heap_sz)) {
        GC_err_printf0("Can't start up: not enough memory\n");
        EXIT();
    }
    /* Preallocate large object map.  It's otherwise inconvenient to 	*/
    /* deal with failure.						*/
      if (!GC_add_map_entry((word)0)) {
        GC_err_printf0("Can't start up: not enough memory\n");
        EXIT();
      }
    GC_register_displacement_inner(0L);
#   ifdef MERGE_SIZES
      GC_init_size_map();
#   endif
#   ifdef PCR
      if (PCR_IL_Lock(PCR_Bool_false, PCR_allSigsBlocked, PCR_waitForever)
          != PCR_ERes_okay) {
          ABORT("Can't lock load state\n");
      } else if (PCR_IL_Unlock() != PCR_ERes_okay) {
          ABORT("Can't unlock load state\n");
      }
      PCR_IL_Unlock();
      GC_pcr_install();
#   endif
#   if !defined(SMALL_CONFIG)
      if (!GC_no_win32_dlls && 0 != GETENV("GC_ENABLE_INCREMENTAL")) {
	GC_ASSERT(!GC_incremental);
        GC_setpagesize();
#       ifndef GC_SOLARIS_THREADS
          GC_dirty_init();
#       endif
        GC_ASSERT(GC_words_allocd == 0)
    	GC_incremental = TRUE;
      }
#   endif /* !SMALL_CONFIG */
    COND_DUMP;
    /* Get black list set up and/or incremental GC started */
      if (!GC_dont_precollect || GC_incremental) GC_gcollect_inner();
    GC_is_initialized = TRUE;
#   ifdef STUBBORN_ALLOC
    	GC_stubborn_init();
#   endif
    /* Convince lint that some things are used */
#   ifdef LINT
      {
          extern char * GC_copyright[];
          extern int GC_read();
          extern void GC_register_finalizer_no_order();
          
          GC_noop(GC_copyright, GC_find_header,
                  GC_push_one, GC_call_with_alloc_lock, GC_read,
                  GC_dont_expand,
#		  ifndef NO_DEBUGGING
		    GC_dump,
#		  endif
                  GC_register_finalizer_no_order);
      }
#   endif
}

void GC_enable_incremental GC_PROTO(())
{
# if !defined(SMALL_CONFIG)
  if (!GC_find_leak) {
    DCL_LOCK_STATE;
    
    DISABLE_SIGNALS();
    LOCK();
    if (GC_incremental) goto out;
    GC_setpagesize();
    if (GC_no_win32_dlls) goto out;
#   ifndef GC_SOLARIS_THREADS 
      maybe_install_looping_handler();  /* Before write fault handler! */
      GC_dirty_init();
#   endif
    if (!GC_is_initialized) {
        GC_init_inner();
    }
    if (GC_incremental) goto out;
    if (GC_dont_gc) {
        /* Can't easily do it. */
        UNLOCK();
    	ENABLE_SIGNALS();
    	return;
    }
    if (GC_words_allocd > 0) {
    	/* There may be unmarked reachable objects	*/
    	GC_gcollect_inner();
    }   /* else we're OK in assuming everything's	*/
    	/* clean since nothing can point to an	  	*/
    	/* unmarked object.			  	*/
    GC_read_dirty();
    GC_incremental = TRUE;
out:
    UNLOCK();
    ENABLE_SIGNALS();
  }
# endif
}


#if defined(MSWIN32) || defined(MSWINCE)
# define LOG_FILE _T("gc.log")

  HANDLE GC_stdout = 0;

  void GC_deinit()
  {
      if (GC_is_initialized) {
  	DeleteCriticalSection(&GC_write_cs);
      }
  }

  int GC_write(buf, len)
  GC_CONST char * buf;
  size_t len;
  {
      BOOL tmp;
      DWORD written;
      if (len == 0)
	  return 0;
      EnterCriticalSection(&GC_write_cs);
      if (GC_stdout == INVALID_HANDLE_VALUE) {
	  return -1;
      } else if (GC_stdout == 0) {
	  GC_stdout = CreateFile(LOG_FILE, GENERIC_WRITE,
        			 FILE_SHARE_READ | FILE_SHARE_WRITE,
        			 NULL, CREATE_ALWAYS, FILE_FLAG_WRITE_THROUGH,
        			 NULL); 
    	  if (GC_stdout == INVALID_HANDLE_VALUE) ABORT("Open of log file failed");
      }
      tmp = WriteFile(GC_stdout, buf, len, &written, NULL);
      if (!tmp)
	  DebugBreak();
      LeaveCriticalSection(&GC_write_cs);
      return tmp ? (int)written : -1;
  }

#endif

#if defined(OS2) || defined(MACOS)
FILE * GC_stdout = NULL;
FILE * GC_stderr = NULL;
int GC_tmp;  /* Should really be local ... */

  void GC_set_files()
  {
      if (GC_stdout == NULL) {
	GC_stdout = stdout;
    }
    if (GC_stderr == NULL) {
	GC_stderr = stderr;
    }
  }
#endif

#if !defined(OS2) && !defined(MACOS) && !defined(MSWIN32) && !defined(MSWINCE)
  int GC_stdout = 1;
  int GC_stderr = 2;
# if !defined(AMIGA)
#   include <unistd.h>
# endif
#endif

#if !defined(MSWIN32) && !defined(MSWINCE) && !defined(OS2) \
    && !defined(MACOS)  && !defined(ECOS) && !defined(NOSYS)
int GC_write(fd, buf, len)
int fd;
GC_CONST char *buf;
size_t len;
{
     register int bytes_written = 0;
     register int result;
     
     while (bytes_written < len) {
#	ifdef GC_SOLARIS_THREADS
	    result = syscall(SYS_write, fd, buf + bytes_written,
	    			  	    len - bytes_written);
#	else
     	    result = write(fd, buf + bytes_written, len - bytes_written);
#	endif
	if (-1 == result) return(result);
	bytes_written += result;
    }
    return(bytes_written);
}
#endif /* UN*X */

#ifdef ECOS
int GC_write(fd, buf, len)
{
  _Jv_diag_write (buf, len);
  return len;
}
#endif

#ifdef NOSYS
int GC_write(fd, buf, len)
{
  /* No writing.  */
  return len;
}
#endif


#if defined(MSWIN32) || defined(MSWINCE)
#   define WRITE(f, buf, len) GC_write(buf, len)
#else
#   if defined(OS2) || defined(MACOS)
#   define WRITE(f, buf, len) (GC_set_files(), \
			       GC_tmp = fwrite((buf), 1, (len), (f)), \
			       fflush(f), GC_tmp)
#   else
#     define WRITE(f, buf, len) GC_write((f), (buf), (len))
#   endif
#endif

/* A version of printf that is unlikely to call malloc, and is thus safer */
/* to call from the collector in case malloc has been bound to GC_malloc. */
/* Assumes that no more than 1023 characters are written at once.	  */
/* Assumes that all arguments have been converted to something of the	  */
/* same size as long, and that the format conversions expect something	  */
/* of that size.							  */
void GC_printf(format, a, b, c, d, e, f)
GC_CONST char * format;
long a, b, c, d, e, f;
{
    char buf[1025];
    
    if (GC_quiet) return;
    buf[1024] = 0x15;
    (void) sprintf(buf, format, a, b, c, d, e, f);
    if (buf[1024] != 0x15) ABORT("GC_printf clobbered stack");
    if (WRITE(GC_stdout, buf, strlen(buf)) < 0) ABORT("write to stdout failed");
}

void GC_err_printf(format, a, b, c, d, e, f)
GC_CONST char * format;
long a, b, c, d, e, f;
{
    char buf[1025];
    
    buf[1024] = 0x15;
    (void) sprintf(buf, format, a, b, c, d, e, f);
    if (buf[1024] != 0x15) ABORT("GC_err_printf clobbered stack");
    if (WRITE(GC_stderr, buf, strlen(buf)) < 0) ABORT("write to stderr failed");
}

void GC_err_puts(s)
GC_CONST char *s;
{
    if (WRITE(GC_stderr, s, strlen(s)) < 0) ABORT("write to stderr failed");
}

#if defined(LINUX) && !defined(SMALL_CONFIG)
void GC_err_write(buf, len)
GC_CONST char *buf;
size_t len;
{
    if (WRITE(GC_stderr, buf, len) < 0) ABORT("write to stderr failed");
}
#endif

# if defined(__STDC__) || defined(__cplusplus)
    void GC_default_warn_proc(char *msg, GC_word arg)
# else
    void GC_default_warn_proc(msg, arg)
    char *msg;
    GC_word arg;
# endif
{
    GC_err_printf1(msg, (unsigned long)arg);
}

GC_warn_proc GC_current_warn_proc = GC_default_warn_proc;

# if defined(__STDC__) || defined(__cplusplus)
    GC_warn_proc GC_set_warn_proc(GC_warn_proc p)
# else
    GC_warn_proc GC_set_warn_proc(p)
    GC_warn_proc p;
# endif
{
    GC_warn_proc result;

#   ifdef GC_WIN32_THREADS
      GC_ASSERT(GC_is_initialized);
#   endif
    LOCK();
    result = GC_current_warn_proc;
    GC_current_warn_proc = p;
    UNLOCK();
    return(result);
}

# if defined(__STDC__) || defined(__cplusplus)
    GC_word GC_set_free_space_divisor (GC_word value)
# else
    GC_word GC_set_free_space_divisor (value)
    GC_word value;
# endif
{
    GC_word old = GC_free_space_divisor;
    GC_free_space_divisor = value;
    return old;
}

#ifndef PCR
void GC_abort(msg)
GC_CONST char * msg;
{
#   if defined(MSWIN32)
      (void) MessageBoxA(NULL, msg, "Fatal error in gc", MB_ICONERROR|MB_OK);
#   else
      GC_err_printf1("%s\n", msg);
#   endif
    if (GETENV("GC_LOOP_ON_ABORT") != NULL) {
	    /* In many cases it's easier to debug a running process.	*/
	    /* It's arguably nicer to sleep, but that makes it harder	*/
	    /* to look at the thread if the debugger doesn't know much	*/
	    /* about threads.						*/
	    for(;;) {}
    }
#   if defined(MSWIN32) || defined(MSWINCE)
	DebugBreak();
#   else
        (void) abort();
#   endif
}
#endif

void GC_enable()
{
    LOCK();
    GC_dont_gc--;
    UNLOCK();
}

void GC_disable()
{
    LOCK();
    GC_dont_gc++;
    UNLOCK();
}

/* Helper procedures for new kind creation.	*/
void ** GC_new_free_list_inner()
{
    void *result = GC_INTERNAL_MALLOC((MAXOBJSZ+1)*sizeof(ptr_t), PTRFREE);
    if (result == 0) ABORT("Failed to allocate freelist for new kind");
    BZERO(result, (MAXOBJSZ+1)*sizeof(ptr_t));
    return result;
}

void ** GC_new_free_list()
{
    void *result;
    LOCK(); DISABLE_SIGNALS();
    result = GC_new_free_list_inner();
    UNLOCK(); ENABLE_SIGNALS();
    return result;
}

int GC_new_kind_inner(fl, descr, adjust, clear)
void **fl;
GC_word descr;
int adjust;
int clear;
{
    int result = GC_n_kinds++;

    if (GC_n_kinds > MAXOBJKINDS) ABORT("Too many kinds");
    GC_obj_kinds[result].ok_freelist = (ptr_t *)fl;
    GC_obj_kinds[result].ok_reclaim_list = 0;
    GC_obj_kinds[result].ok_descriptor = descr;
    GC_obj_kinds[result].ok_relocate_descr = adjust;
    GC_obj_kinds[result].ok_init = clear;
    return result;
}

int GC_new_kind(fl, descr, adjust, clear)
void **fl;
GC_word descr;
int adjust;
int clear;
{
    int result;
    LOCK(); DISABLE_SIGNALS();
    result = GC_new_kind_inner(fl, descr, adjust, clear);
    UNLOCK(); ENABLE_SIGNALS();
    return result;
}

int GC_new_proc_inner(proc)
GC_mark_proc proc;
{
    int result = GC_n_mark_procs++;

    if (GC_n_mark_procs > MAX_MARK_PROCS) ABORT("Too many mark procedures");
    GC_mark_procs[result] = proc;
    return result;
}

int GC_new_proc(proc)
GC_mark_proc proc;
{
    int result;
    LOCK(); DISABLE_SIGNALS();
    result = GC_new_proc_inner(proc);
    UNLOCK(); ENABLE_SIGNALS();
    return result;
}


#if !defined(NO_DEBUGGING)

void GC_dump()
{
    GC_printf0("***Static roots:\n");
    GC_print_static_roots();
    GC_printf0("\n***Heap sections:\n");
    GC_print_heap_sects();
    GC_printf0("\n***Free blocks:\n");
    GC_print_hblkfreelist();
    GC_printf0("\n***Blocks in use:\n");
    GC_print_block_list();
    GC_printf0("\n***Finalization statistics:\n");
    GC_print_finalization_stats();
}

#endif /* NO_DEBUGGING */