forked from ruby/ruby
/
gc.c
9605 lines (8352 loc) · 250 KB
/
gc.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
/**********************************************************************
gc.c -
$Author$
created at: Tue Oct 5 09:44:46 JST 1993
Copyright (C) 1993-2007 Yukihiro Matsumoto
Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
Copyright (C) 2000 Information-technology Promotion Agency, Japan
**********************************************************************/
#define rb_data_object_alloc rb_data_object_alloc
#define rb_data_typed_object_alloc rb_data_typed_object_alloc
#include "internal.h"
#include "ruby/st.h"
#include "ruby/re.h"
#include "ruby/io.h"
#include "ruby/thread.h"
#include "ruby/util.h"
#include "ruby/debug.h"
#include "eval_intern.h"
#include "vm_core.h"
#include "gc.h"
#include "constant.h"
#include "ruby_atomic.h"
#include "probes.h"
#include "id_table.h"
#include <stdio.h>
#include <stdarg.h>
#include <setjmp.h>
#include <sys/types.h>
#include "ruby_assert.h"
#undef rb_data_object_wrap
#ifndef HAVE_MALLOC_USABLE_SIZE
# ifdef _WIN32
# define HAVE_MALLOC_USABLE_SIZE
# define malloc_usable_size(a) _msize(a)
# elif defined HAVE_MALLOC_SIZE
# define HAVE_MALLOC_USABLE_SIZE
# define malloc_usable_size(a) malloc_size(a)
# endif
#endif
#ifdef HAVE_MALLOC_USABLE_SIZE
# ifdef HAVE_MALLOC_H
# include <malloc.h>
# elif defined(HAVE_MALLOC_NP_H)
# include <malloc_np.h>
# elif defined(HAVE_MALLOC_MALLOC_H)
# include <malloc/malloc.h>
# endif
#endif
#if /* is ASAN enabled? */ \
__has_feature(address_sanitizer) /* Clang */ || \
defined(__SANITIZE_ADDRESS__) /* GCC 4.8.x */
#define ATTRIBUTE_NO_ADDRESS_SAFETY_ANALYSIS \
__attribute__((no_address_safety_analysis)) \
__attribute__((noinline))
#else
#define ATTRIBUTE_NO_ADDRESS_SAFETY_ANALYSIS
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#if defined(__native_client__) && defined(NACL_NEWLIB)
# include "nacl/resource.h"
# undef HAVE_POSIX_MEMALIGN
# undef HAVE_MEMALIGN
#endif
#if defined _WIN32 || defined __CYGWIN__
#include <windows.h>
#elif defined(HAVE_POSIX_MEMALIGN)
#elif defined(HAVE_MEMALIGN)
#include <malloc.h>
#endif
#define rb_setjmp(env) RUBY_SETJMP(env)
#define rb_jmp_buf rb_jmpbuf_t
#if defined(HAVE_RB_GC_GUARDED_PTR_VAL) && HAVE_RB_GC_GUARDED_PTR_VAL
/* trick the compiler into thinking a external signal handler uses this */
volatile VALUE rb_gc_guarded_val;
volatile VALUE *
rb_gc_guarded_ptr_val(volatile VALUE *ptr, VALUE val)
{
rb_gc_guarded_val = val;
return ptr;
}
#endif
#ifndef GC_HEAP_INIT_SLOTS
#define GC_HEAP_INIT_SLOTS 10000
#endif
#ifndef GC_HEAP_FREE_SLOTS
#define GC_HEAP_FREE_SLOTS 4096
#endif
#ifndef GC_HEAP_GROWTH_FACTOR
#define GC_HEAP_GROWTH_FACTOR 1.8
#endif
#ifndef GC_HEAP_GROWTH_MAX_SLOTS
#define GC_HEAP_GROWTH_MAX_SLOTS 0 /* 0 is disable */
#endif
#ifndef GC_HEAP_OLDOBJECT_LIMIT_FACTOR
#define GC_HEAP_OLDOBJECT_LIMIT_FACTOR 2.0
#endif
#ifndef GC_HEAP_FREE_SLOTS_MIN_RATIO
#define GC_HEAP_FREE_SLOTS_MIN_RATIO 0.20
#endif
#ifndef GC_HEAP_FREE_SLOTS_GOAL_RATIO
#define GC_HEAP_FREE_SLOTS_GOAL_RATIO 0.40
#endif
#ifndef GC_HEAP_FREE_SLOTS_MAX_RATIO
#define GC_HEAP_FREE_SLOTS_MAX_RATIO 0.65
#endif
#ifndef GC_MALLOC_LIMIT_MIN
#define GC_MALLOC_LIMIT_MIN (16 * 1024 * 1024 /* 16MB */)
#endif
#ifndef GC_MALLOC_LIMIT_MAX
#define GC_MALLOC_LIMIT_MAX (32 * 1024 * 1024 /* 32MB */)
#endif
#ifndef GC_MALLOC_LIMIT_GROWTH_FACTOR
#define GC_MALLOC_LIMIT_GROWTH_FACTOR 1.4
#endif
#ifndef GC_OLDMALLOC_LIMIT_MIN
#define GC_OLDMALLOC_LIMIT_MIN (16 * 1024 * 1024 /* 16MB */)
#endif
#ifndef GC_OLDMALLOC_LIMIT_GROWTH_FACTOR
#define GC_OLDMALLOC_LIMIT_GROWTH_FACTOR 1.2
#endif
#ifndef GC_OLDMALLOC_LIMIT_MAX
#define GC_OLDMALLOC_LIMIT_MAX (128 * 1024 * 1024 /* 128MB */)
#endif
#ifndef PRINT_MEASURE_LINE
#define PRINT_MEASURE_LINE 0
#endif
#ifndef PRINT_ENTER_EXIT_TICK
#define PRINT_ENTER_EXIT_TICK 0
#endif
#ifndef PRINT_ROOT_TICKS
#define PRINT_ROOT_TICKS 0
#endif
#define USE_TICK_T (PRINT_ENTER_EXIT_TICK || PRINT_MEASURE_LINE || PRINT_ROOT_TICKS)
#define TICK_TYPE 1
typedef struct {
size_t heap_init_slots;
size_t heap_free_slots;
double growth_factor;
size_t growth_max_slots;
double heap_free_slots_min_ratio;
double heap_free_slots_goal_ratio;
double heap_free_slots_max_ratio;
double oldobject_limit_factor;
size_t malloc_limit_min;
size_t malloc_limit_max;
double malloc_limit_growth_factor;
size_t oldmalloc_limit_min;
size_t oldmalloc_limit_max;
double oldmalloc_limit_growth_factor;
VALUE gc_stress;
} ruby_gc_params_t;
static ruby_gc_params_t gc_params = {
GC_HEAP_INIT_SLOTS,
GC_HEAP_FREE_SLOTS,
GC_HEAP_GROWTH_FACTOR,
GC_HEAP_GROWTH_MAX_SLOTS,
GC_HEAP_FREE_SLOTS_MIN_RATIO,
GC_HEAP_FREE_SLOTS_GOAL_RATIO,
GC_HEAP_FREE_SLOTS_MAX_RATIO,
GC_HEAP_OLDOBJECT_LIMIT_FACTOR,
GC_MALLOC_LIMIT_MIN,
GC_MALLOC_LIMIT_MAX,
GC_MALLOC_LIMIT_GROWTH_FACTOR,
GC_OLDMALLOC_LIMIT_MIN,
GC_OLDMALLOC_LIMIT_MAX,
GC_OLDMALLOC_LIMIT_GROWTH_FACTOR,
FALSE,
};
/* GC_DEBUG:
* enable to embed GC debugging information.
*/
#ifndef GC_DEBUG
#define GC_DEBUG 0
#endif
#if USE_RGENGC
/* RGENGC_DEBUG:
* 1: basic information
* 2: remember set operation
* 3: mark
* 4:
* 5: sweep
*/
#ifndef RGENGC_DEBUG
#define RGENGC_DEBUG 0
#endif
/* RGENGC_CHECK_MODE
* 0: disable all assertions
* 1: enable assertions (to debug RGenGC)
* 2: enable internal consistency check at each GC (for debugging)
* 3: enable internal consistency check at each GC steps (for debugging)
* 4: enable liveness check
* 5: show all references
*/
#ifndef RGENGC_CHECK_MODE
#define RGENGC_CHECK_MODE 0
#endif
/* RGENGC_OLD_NEWOBJ_CHECK
* 0: disable all assertions
* >0: make a OLD object when new object creation.
*
* Make one OLD object per RGENGC_OLD_NEWOBJ_CHECK WB protected objects creation.
*/
#ifndef RGENGC_OLD_NEWOBJ_CHECK
#define RGENGC_OLD_NEWOBJ_CHECK 0
#endif
/* RGENGC_PROFILE
* 0: disable RGenGC profiling
* 1: enable profiling for basic information
* 2: enable profiling for each types
*/
#ifndef RGENGC_PROFILE
#define RGENGC_PROFILE 0
#endif
/* RGENGC_ESTIMATE_OLDMALLOC
* Enable/disable to estimate increase size of malloc'ed size by old objects.
* If estimation exceeds threshold, then will invoke full GC.
* 0: disable estimation.
* 1: enable estimation.
*/
#ifndef RGENGC_ESTIMATE_OLDMALLOC
#define RGENGC_ESTIMATE_OLDMALLOC 1
#endif
/* RGENGC_FORCE_MAJOR_GC
* Force major/full GC if this macro is not 0.
*/
#ifndef RGENGC_FORCE_MAJOR_GC
#define RGENGC_FORCE_MAJOR_GC 0
#endif
#else /* USE_RGENGC */
#ifdef RGENGC_DEBUG
#undef RGENGC_DEBUG
#endif
#define RGENGC_DEBUG 0
#ifdef RGENGC_CHECK_MODE
#undef RGENGC_CHECK_MODE
#endif
#define RGENGC_CHECK_MODE 0
#define RGENGC_PROFILE 0
#define RGENGC_ESTIMATE_OLDMALLOC 0
#define RGENGC_FORCE_MAJOR_GC 0
#endif /* USE_RGENGC */
#ifndef GC_PROFILE_MORE_DETAIL
#define GC_PROFILE_MORE_DETAIL 0
#endif
#ifndef GC_PROFILE_DETAIL_MEMORY
#define GC_PROFILE_DETAIL_MEMORY 0
#endif
#ifndef GC_ENABLE_INCREMENTAL_MARK
#define GC_ENABLE_INCREMENTAL_MARK USE_RINCGC
#endif
#ifndef GC_ENABLE_LAZY_SWEEP
#define GC_ENABLE_LAZY_SWEEP 1
#endif
#ifndef CALC_EXACT_MALLOC_SIZE
#define CALC_EXACT_MALLOC_SIZE 0
#endif
#if defined(HAVE_MALLOC_USABLE_SIZE) || CALC_EXACT_MALLOC_SIZE > 0
#ifndef MALLOC_ALLOCATED_SIZE
#define MALLOC_ALLOCATED_SIZE 0
#endif
#else
#define MALLOC_ALLOCATED_SIZE 0
#endif
#ifndef MALLOC_ALLOCATED_SIZE_CHECK
#define MALLOC_ALLOCATED_SIZE_CHECK 0
#endif
#ifndef GC_DEBUG_STRESS_TO_CLASS
#define GC_DEBUG_STRESS_TO_CLASS 0
#endif
#ifndef RGENGC_OBJ_INFO
#define RGENGC_OBJ_INFO (RGENGC_DEBUG | RGENGC_CHECK_MODE)
#endif
typedef enum {
GPR_FLAG_NONE = 0x000,
/* major reason */
GPR_FLAG_MAJOR_BY_NOFREE = 0x001,
GPR_FLAG_MAJOR_BY_OLDGEN = 0x002,
GPR_FLAG_MAJOR_BY_SHADY = 0x004,
GPR_FLAG_MAJOR_BY_FORCE = 0x008,
#if RGENGC_ESTIMATE_OLDMALLOC
GPR_FLAG_MAJOR_BY_OLDMALLOC = 0x020,
#endif
GPR_FLAG_MAJOR_MASK = 0x0ff,
/* gc reason */
GPR_FLAG_NEWOBJ = 0x100,
GPR_FLAG_MALLOC = 0x200,
GPR_FLAG_METHOD = 0x400,
GPR_FLAG_CAPI = 0x800,
GPR_FLAG_STRESS = 0x1000,
/* others */
GPR_FLAG_IMMEDIATE_SWEEP = 0x2000,
GPR_FLAG_HAVE_FINALIZE = 0x4000
} gc_profile_record_flag;
typedef struct gc_profile_record {
int flags;
double gc_time;
double gc_invoke_time;
size_t heap_total_objects;
size_t heap_use_size;
size_t heap_total_size;
#if GC_PROFILE_MORE_DETAIL
double gc_mark_time;
double gc_sweep_time;
size_t heap_use_pages;
size_t heap_live_objects;
size_t heap_free_objects;
size_t allocate_increase;
size_t allocate_limit;
double prepare_time;
size_t removing_objects;
size_t empty_objects;
#if GC_PROFILE_DETAIL_MEMORY
long maxrss;
long minflt;
long majflt;
#endif
#endif
#if MALLOC_ALLOCATED_SIZE
size_t allocated_size;
#endif
#if RGENGC_PROFILE > 0
size_t old_objects;
size_t remembered_normal_objects;
size_t remembered_shady_objects;
#endif
} gc_profile_record;
#if defined(_MSC_VER) || defined(__CYGWIN__)
#pragma pack(push, 1) /* magic for reducing sizeof(RVALUE): 24 -> 20 */
#endif
typedef struct RVALUE {
union {
struct {
VALUE flags; /* always 0 for freed obj */
struct RVALUE *next;
} free;
struct RBasic basic;
struct RObject object;
struct RClass klass;
struct RFloat flonum;
struct RString string;
struct RArray array;
struct RRegexp regexp;
struct RHash hash;
struct RData data;
struct RTypedData typeddata;
struct RStruct rstruct;
struct RBignum bignum;
struct RFile file;
struct RNode node;
struct RMatch match;
struct RRational rational;
struct RComplex complex;
union {
rb_cref_t cref;
struct vm_svar svar;
struct vm_throw_data throw_data;
struct vm_ifunc ifunc;
struct MEMO memo;
struct rb_method_entry_struct ment;
const rb_iseq_t iseq;
rb_env_t env;
} imemo;
struct {
struct RBasic basic;
VALUE v1;
VALUE v2;
VALUE v3;
} values;
} as;
#if GC_DEBUG
const char *file;
int line;
#endif
} RVALUE;
#if defined(_MSC_VER) || defined(__CYGWIN__)
#pragma pack(pop)
#endif
typedef uintptr_t bits_t;
enum {
BITS_SIZE = sizeof(bits_t),
BITS_BITLENGTH = ( BITS_SIZE * CHAR_BIT )
};
struct heap_page_header {
struct heap_page *page;
};
struct heap_page_body {
struct heap_page_header header;
/* char gap[]; */
/* RVALUE values[]; */
};
struct gc_list {
VALUE *varptr;
struct gc_list *next;
};
#define STACK_CHUNK_SIZE 500
typedef struct stack_chunk {
VALUE data[STACK_CHUNK_SIZE];
struct stack_chunk *next;
} stack_chunk_t;
typedef struct mark_stack {
stack_chunk_t *chunk;
stack_chunk_t *cache;
int index;
int limit;
size_t cache_size;
size_t unused_cache_size;
} mark_stack_t;
typedef struct rb_heap_struct {
RVALUE *freelist;
struct heap_page *free_pages;
struct heap_page *using_page;
struct heap_page *pages;
struct heap_page *sweep_pages;
#if GC_ENABLE_INCREMENTAL_MARK
struct heap_page *pooled_pages;
#endif
size_t total_pages; /* total page count in a heap */
size_t total_slots; /* total slot count (about total_pages * HEAP_PAGE_OBJ_LIMIT) */
} rb_heap_t;
enum gc_mode {
gc_mode_none,
gc_mode_marking,
gc_mode_sweeping
};
typedef struct rb_objspace {
struct {
size_t limit;
size_t increase;
#if MALLOC_ALLOCATED_SIZE
size_t allocated_size;
size_t allocations;
#endif
} malloc_params;
struct {
unsigned int mode : 2;
unsigned int immediate_sweep : 1;
unsigned int dont_gc : 1;
unsigned int dont_incremental : 1;
unsigned int during_gc : 1;
unsigned int gc_stressful: 1;
unsigned int has_hook: 1;
#if USE_RGENGC
unsigned int during_minor_gc : 1;
#endif
#if GC_ENABLE_INCREMENTAL_MARK
unsigned int during_incremental_marking : 1;
#endif
} flags;
rb_event_flag_t hook_events;
size_t total_allocated_objects;
rb_heap_t eden_heap;
rb_heap_t tomb_heap; /* heap for zombies and ghosts */
struct {
rb_atomic_t finalizing;
} atomic_flags;
struct mark_func_data_struct {
void *data;
void (*mark_func)(VALUE v, void *data);
} *mark_func_data;
mark_stack_t mark_stack;
size_t marked_slots;
struct {
struct heap_page **sorted;
size_t allocated_pages;
size_t allocatable_pages;
size_t sorted_length;
RVALUE *range[2];
size_t freeable_pages;
/* final */
size_t final_slots;
VALUE deferred_final;
} heap_pages;
st_table *finalizer_table;
struct {
int run;
int latest_gc_info;
gc_profile_record *records;
gc_profile_record *current_record;
size_t next_index;
size_t size;
#if GC_PROFILE_MORE_DETAIL
double prepare_time;
#endif
double invoke_time;
#if USE_RGENGC
size_t minor_gc_count;
size_t major_gc_count;
#if RGENGC_PROFILE > 0
size_t total_generated_normal_object_count;
size_t total_generated_shady_object_count;
size_t total_shade_operation_count;
size_t total_promoted_count;
size_t total_remembered_normal_object_count;
size_t total_remembered_shady_object_count;
#if RGENGC_PROFILE >= 2
size_t generated_normal_object_count_types[RUBY_T_MASK];
size_t generated_shady_object_count_types[RUBY_T_MASK];
size_t shade_operation_count_types[RUBY_T_MASK];
size_t promoted_types[RUBY_T_MASK];
size_t remembered_normal_object_count_types[RUBY_T_MASK];
size_t remembered_shady_object_count_types[RUBY_T_MASK];
#endif
#endif /* RGENGC_PROFILE */
#endif /* USE_RGENGC */
/* temporary profiling space */
double gc_sweep_start_time;
size_t total_allocated_objects_at_gc_start;
size_t heap_used_at_gc_start;
/* basic statistics */
size_t count;
size_t total_freed_objects;
size_t total_allocated_pages;
size_t total_freed_pages;
} profile;
struct gc_list *global_list;
VALUE gc_stress_mode;
#if USE_RGENGC
struct {
VALUE parent_object;
int need_major_gc;
size_t last_major_gc;
size_t uncollectible_wb_unprotected_objects;
size_t uncollectible_wb_unprotected_objects_limit;
size_t old_objects;
size_t old_objects_limit;
#if RGENGC_ESTIMATE_OLDMALLOC
size_t oldmalloc_increase;
size_t oldmalloc_increase_limit;
#endif
#if RGENGC_CHECK_MODE >= 2
struct st_table *allrefs_table;
size_t error_count;
#endif
} rgengc;
#if GC_ENABLE_INCREMENTAL_MARK
struct {
size_t pooled_slots;
size_t step_slots;
} rincgc;
#endif
#endif /* USE_RGENGC */
#if GC_DEBUG_STRESS_TO_CLASS
VALUE stress_to_class;
#endif
} rb_objspace_t;
#ifndef HEAP_PAGE_ALIGN_LOG
/* default tiny heap size: 16KB */
#define HEAP_PAGE_ALIGN_LOG 14
#endif
#define CEILDIV(i, mod) (((i) + (mod) - 1)/(mod))
enum {
HEAP_PAGE_ALIGN = (1UL << HEAP_PAGE_ALIGN_LOG),
HEAP_PAGE_ALIGN_MASK = (~(~0UL << HEAP_PAGE_ALIGN_LOG)),
REQUIRED_SIZE_BY_MALLOC = (sizeof(size_t) * 5),
HEAP_PAGE_SIZE = (HEAP_PAGE_ALIGN - REQUIRED_SIZE_BY_MALLOC),
HEAP_PAGE_OBJ_LIMIT = (unsigned int)((HEAP_PAGE_SIZE - sizeof(struct heap_page_header))/sizeof(struct RVALUE)),
HEAP_PAGE_BITMAP_LIMIT = CEILDIV(CEILDIV(HEAP_PAGE_SIZE, sizeof(struct RVALUE)), BITS_BITLENGTH),
HEAP_PAGE_BITMAP_SIZE = (BITS_SIZE * HEAP_PAGE_BITMAP_LIMIT),
HEAP_PAGE_BITMAP_PLANES = USE_RGENGC ? 4 : 1 /* RGENGC: mark, unprotected, uncollectible, marking */
};
struct heap_page {
struct heap_page *prev;
short total_slots;
short free_slots;
short final_slots;
struct {
unsigned int before_sweep : 1;
unsigned int has_remembered_objects : 1;
unsigned int has_uncollectible_shady_objects : 1;
unsigned int in_tomb : 1;
} flags;
struct heap_page *free_next;
RVALUE *start;
RVALUE *freelist;
struct heap_page *next;
#if USE_RGENGC
bits_t wb_unprotected_bits[HEAP_PAGE_BITMAP_LIMIT];
#endif
/* the following three bitmaps are cleared at the beginning of full GC */
bits_t mark_bits[HEAP_PAGE_BITMAP_LIMIT];
#if USE_RGENGC
bits_t uncollectible_bits[HEAP_PAGE_BITMAP_LIMIT];
bits_t marking_bits[HEAP_PAGE_BITMAP_LIMIT];
#endif
};
#define GET_PAGE_BODY(x) ((struct heap_page_body *)((bits_t)(x) & ~(HEAP_PAGE_ALIGN_MASK)))
#define GET_PAGE_HEADER(x) (&GET_PAGE_BODY(x)->header)
#define GET_HEAP_PAGE(x) (GET_PAGE_HEADER(x)->page)
#define NUM_IN_PAGE(p) (((bits_t)(p) & HEAP_PAGE_ALIGN_MASK)/sizeof(RVALUE))
#define BITMAP_INDEX(p) (NUM_IN_PAGE(p) / BITS_BITLENGTH )
#define BITMAP_OFFSET(p) (NUM_IN_PAGE(p) & (BITS_BITLENGTH-1))
#define BITMAP_BIT(p) ((bits_t)1 << BITMAP_OFFSET(p))
/* Bitmap Operations */
#define MARKED_IN_BITMAP(bits, p) ((bits)[BITMAP_INDEX(p)] & BITMAP_BIT(p))
#define MARK_IN_BITMAP(bits, p) ((bits)[BITMAP_INDEX(p)] = (bits)[BITMAP_INDEX(p)] | BITMAP_BIT(p))
#define CLEAR_IN_BITMAP(bits, p) ((bits)[BITMAP_INDEX(p)] = (bits)[BITMAP_INDEX(p)] & ~BITMAP_BIT(p))
/* getting bitmap */
#define GET_HEAP_MARK_BITS(x) (&GET_HEAP_PAGE(x)->mark_bits[0])
#if USE_RGENGC
#define GET_HEAP_UNCOLLECTIBLE_BITS(x) (&GET_HEAP_PAGE(x)->uncollectible_bits[0])
#define GET_HEAP_WB_UNPROTECTED_BITS(x) (&GET_HEAP_PAGE(x)->wb_unprotected_bits[0])
#define GET_HEAP_MARKING_BITS(x) (&GET_HEAP_PAGE(x)->marking_bits[0])
#endif
/* Aliases */
#if defined(ENABLE_VM_OBJSPACE) && ENABLE_VM_OBJSPACE
#define rb_objspace (*rb_objspace_of(GET_VM()))
#define rb_objspace_of(vm) ((vm)->objspace)
#else
static rb_objspace_t rb_objspace = {{GC_MALLOC_LIMIT_MIN}};
#define rb_objspace_of(vm) (&rb_objspace)
#endif
#define ruby_initial_gc_stress gc_params.gc_stress
VALUE *ruby_initial_gc_stress_ptr = &ruby_initial_gc_stress;
#define malloc_limit objspace->malloc_params.limit
#define malloc_increase objspace->malloc_params.increase
#define malloc_allocated_size objspace->malloc_params.allocated_size
#define heap_pages_sorted objspace->heap_pages.sorted
#define heap_allocated_pages objspace->heap_pages.allocated_pages
#define heap_pages_sorted_length objspace->heap_pages.sorted_length
#define heap_pages_lomem objspace->heap_pages.range[0]
#define heap_pages_himem objspace->heap_pages.range[1]
#define heap_allocatable_pages objspace->heap_pages.allocatable_pages
#define heap_pages_freeable_pages objspace->heap_pages.freeable_pages
#define heap_pages_final_slots objspace->heap_pages.final_slots
#define heap_pages_deferred_final objspace->heap_pages.deferred_final
#define heap_eden (&objspace->eden_heap)
#define heap_tomb (&objspace->tomb_heap)
#define dont_gc objspace->flags.dont_gc
#define during_gc objspace->flags.during_gc
#define finalizing objspace->atomic_flags.finalizing
#define finalizer_table objspace->finalizer_table
#define global_list objspace->global_list
#define ruby_gc_stressful objspace->flags.gc_stressful
#define ruby_gc_stress_mode objspace->gc_stress_mode
#if GC_DEBUG_STRESS_TO_CLASS
#define stress_to_class objspace->stress_to_class
#else
#define stress_to_class 0
#endif
static inline enum gc_mode
gc_mode_verify(enum gc_mode mode)
{
#if RGENGC_CHECK_MODE > 0
switch (mode) {
case gc_mode_none:
case gc_mode_marking:
case gc_mode_sweeping:
break;
default:
rb_bug("gc_mode_verify: unreachable (%d)", (int)mode);
}
#endif
return mode;
}
#define gc_mode(objspace) gc_mode_verify((enum gc_mode)(objspace)->flags.mode)
#define gc_mode_set(objspace, mode) ((objspace)->flags.mode = (unsigned int)gc_mode_verify(mode))
#define is_marking(objspace) (gc_mode(objspace) == gc_mode_marking)
#define is_sweeping(objspace) (gc_mode(objspace) == gc_mode_sweeping)
#if USE_RGENGC
#define is_full_marking(objspace) ((objspace)->flags.during_minor_gc == FALSE)
#else
#define is_full_marking(objspace) TRUE
#endif
#if GC_ENABLE_INCREMENTAL_MARK
#define is_incremental_marking(objspace) ((objspace)->flags.during_incremental_marking != FALSE)
#else
#define is_incremental_marking(objspace) FALSE
#endif
#if GC_ENABLE_INCREMENTAL_MARK
#define will_be_incremental_marking(objspace) ((objspace)->rgengc.need_major_gc != GPR_FLAG_NONE)
#else
#define will_be_incremental_marking(objspace) FALSE
#endif
#define has_sweeping_pages(heap) ((heap)->sweep_pages != 0)
#define is_lazy_sweeping(heap) (GC_ENABLE_LAZY_SWEEP && has_sweeping_pages(heap))
#if SIZEOF_LONG == SIZEOF_VOIDP
# define nonspecial_obj_id(obj) (VALUE)((SIGNED_VALUE)(obj)|FIXNUM_FLAG)
# define obj_id_to_ref(objid) ((objid) ^ FIXNUM_FLAG) /* unset FIXNUM_FLAG */
#elif SIZEOF_LONG_LONG == SIZEOF_VOIDP
# define nonspecial_obj_id(obj) LL2NUM((SIGNED_VALUE)(obj) / 2)
# define obj_id_to_ref(objid) (FIXNUM_P(objid) ? \
((objid) ^ FIXNUM_FLAG) : (NUM2PTR(objid) << 1))
#else
# error not supported
#endif
#define RANY(o) ((RVALUE*)(o))
struct RZombie {
struct RBasic basic;
VALUE next;
void (*dfree)(void *);
void *data;
};
#define RZOMBIE(o) ((struct RZombie *)(o))
#define nomem_error GET_VM()->special_exceptions[ruby_error_nomemory]
int ruby_gc_debug_indent = 0;
VALUE rb_mGC;
int ruby_disable_gc = 0;
void rb_iseq_mark(const rb_iseq_t *iseq);
void rb_iseq_free(const rb_iseq_t *iseq);
void rb_gcdebug_print_obj_condition(VALUE obj);
static void rb_objspace_call_finalizer(rb_objspace_t *objspace);
static VALUE define_final0(VALUE obj, VALUE block);
static void negative_size_allocation_error(const char *);
static void *aligned_malloc(size_t, size_t);
static void aligned_free(void *);
static void init_mark_stack(mark_stack_t *stack);
static int ready_to_gc(rb_objspace_t *objspace);
static int garbage_collect(rb_objspace_t *, int full_mark, int immediate_mark, int immediate_sweep, int reason);
static int gc_start(rb_objspace_t *objspace, const int full_mark, const int immediate_mark, const unsigned int immediate_sweep, int reason);
static void gc_rest(rb_objspace_t *objspace);
static inline void gc_enter(rb_objspace_t *objspace, const char *event);
static inline void gc_exit(rb_objspace_t *objspace, const char *event);
static void gc_marks(rb_objspace_t *objspace, int full_mark);
static void gc_marks_start(rb_objspace_t *objspace, int full);
static int gc_marks_finish(rb_objspace_t *objspace);
static void gc_marks_rest(rb_objspace_t *objspace);
#if GC_ENABLE_INCREMENTAL_MARK
static void gc_marks_step(rb_objspace_t *objspace, int slots);
static void gc_marks_continue(rb_objspace_t *objspace, rb_heap_t *heap);
#endif
static void gc_sweep(rb_objspace_t *objspace);
static void gc_sweep_start(rb_objspace_t *objspace);
static void gc_sweep_finish(rb_objspace_t *objspace);
static int gc_sweep_step(rb_objspace_t *objspace, rb_heap_t *heap);
static void gc_sweep_rest(rb_objspace_t *objspace);
#if GC_ENABLE_LAZY_SWEEP
static void gc_sweep_continue(rb_objspace_t *objspace, rb_heap_t *heap);
#endif
static inline void gc_mark(rb_objspace_t *objspace, VALUE ptr);
static void gc_mark_ptr(rb_objspace_t *objspace, VALUE ptr);
static void gc_mark_maybe(rb_objspace_t *objspace, VALUE ptr);
static void gc_mark_children(rb_objspace_t *objspace, VALUE ptr);
static int gc_mark_stacked_objects_incremental(rb_objspace_t *, size_t count);
static int gc_mark_stacked_objects_all(rb_objspace_t *);
static void gc_grey(rb_objspace_t *objspace, VALUE ptr);
static inline int gc_mark_set(rb_objspace_t *objspace, VALUE obj);
static inline int is_pointer_to_heap(rb_objspace_t *objspace, void *ptr);
static void push_mark_stack(mark_stack_t *, VALUE);
static int pop_mark_stack(mark_stack_t *, VALUE *);
static size_t mark_stack_size(mark_stack_t *stack);
static void shrink_stack_chunk_cache(mark_stack_t *stack);
static size_t obj_memsize_of(VALUE obj, int use_all_types);
static VALUE gc_verify_internal_consistency(VALUE self);
static int gc_verify_heap_page(rb_objspace_t *objspace, struct heap_page *page, VALUE obj);
static int gc_verify_heap_pages(rb_objspace_t *objspace);
static void gc_stress_set(rb_objspace_t *objspace, VALUE flag);
static double getrusage_time(void);
static inline void gc_prof_setup_new_record(rb_objspace_t *objspace, int reason);
static inline void gc_prof_timer_start(rb_objspace_t *);
static inline void gc_prof_timer_stop(rb_objspace_t *);
static inline void gc_prof_mark_timer_start(rb_objspace_t *);
static inline void gc_prof_mark_timer_stop(rb_objspace_t *);
static inline void gc_prof_sweep_timer_start(rb_objspace_t *);
static inline void gc_prof_sweep_timer_stop(rb_objspace_t *);
static inline void gc_prof_set_malloc_info(rb_objspace_t *);
static inline void gc_prof_set_heap_info(rb_objspace_t *);
#define gc_prof_record(objspace) (objspace)->profile.current_record
#define gc_prof_enabled(objspace) ((objspace)->profile.run && (objspace)->profile.current_record)
#ifdef HAVE_VA_ARGS_MACRO
# define gc_report(level, objspace, fmt, ...) \
if ((level) > RGENGC_DEBUG) {} else gc_report_body(level, objspace, fmt, ##__VA_ARGS__)
#else
# define gc_report if (!(RGENGC_DEBUG)) {} else gc_report_body
#endif
PRINTF_ARGS(static void gc_report_body(int level, rb_objspace_t *objspace, const char *fmt, ...), 3, 4);
static const char *obj_info(VALUE obj);
#define PUSH_MARK_FUNC_DATA(v) do { \
struct mark_func_data_struct *prev_mark_func_data = objspace->mark_func_data; \
objspace->mark_func_data = (v);
#define POP_MARK_FUNC_DATA() objspace->mark_func_data = prev_mark_func_data;} while (0)
/*
* 1 - TSC (H/W Time Stamp Counter)
* 2 - getrusage
*/
#ifndef TICK_TYPE
#define TICK_TYPE 1
#endif
#if USE_TICK_T
#if TICK_TYPE == 1
/* the following code is only for internal tuning. */
/* Source code to use RDTSC is quoted and modified from
* http://www.mcs.anl.gov/~kazutomo/rdtsc.html
* written by Kazutomo Yoshii <kazutomo@mcs.anl.gov>
*/
#if defined(__GNUC__) && defined(__i386__)
typedef unsigned long long tick_t;
#define PRItick "llu"
static inline tick_t
tick(void)
{
unsigned long long int x;
__asm__ __volatile__ ("rdtsc" : "=A" (x));
return x;
}
#elif defined(__GNUC__) && defined(__x86_64__)
typedef unsigned long long tick_t;
#define PRItick "llu"
static __inline__ tick_t
tick(void)
{
unsigned long hi, lo;
__asm__ __volatile__ ("rdtsc" : "=a"(lo), "=d"(hi));
return ((unsigned long long)lo)|( ((unsigned long long)hi)<<32);
}
#elif defined(__powerpc64__) && GCC_VERSION_SINCE(4,8,0)
typedef unsigned long long tick_t;
#define PRItick "llu"
static __inline__ tick_t
tick(void)
{
unsigned long long val = __builtin_ppc_get_timebase();
return val;
}
#elif defined(_WIN32) && defined(_MSC_VER)
#include <intrin.h>
typedef unsigned __int64 tick_t;
#define PRItick "llu"
static inline tick_t
tick(void)
{
return __rdtsc();
}
#else /* use clock */
typedef clock_t tick_t;
#define PRItick "llu"
static inline tick_t
tick(void)
{
return clock();
}
#endif /* TSC */
#elif TICK_TYPE == 2
typedef double tick_t;
#define PRItick "4.9f"
static inline tick_t
tick(void)
{
return getrusage_time();
}
#else /* TICK_TYPE */
#error "choose tick type"
#endif /* TICK_TYPE */
#define MEASURE_LINE(expr) do { \
volatile tick_t start_time = tick(); \
volatile tick_t end_time; \
expr; \