-
Notifications
You must be signed in to change notification settings - Fork 24
/
class.c
2643 lines (2316 loc) · 71.9 KB
/
class.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
/**********************************************************************
class.c -
$Author$
created at: Tue Aug 10 15:05:44 JST 1993
Copyright (C) 1993-2007 Yukihiro Matsumoto
**********************************************************************/
/*!
* \addtogroup class
* \{
*/
#include "ruby/internal/config.h"
#include <ctype.h>
#include "constant.h"
#include "debug_counter.h"
#include "id_table.h"
#include "internal.h"
#include "internal/class.h"
#include "internal/eval.h"
#include "internal/hash.h"
#include "internal/object.h"
#include "internal/string.h"
#include "internal/variable.h"
#include "ruby/st.h"
#include "vm_core.h"
/* Flags of T_CLASS
*
* 2: RCLASS_SUPERCLASSES_INCLUDE_SELF
* The RCLASS_SUPERCLASSES contains the class as the last element.
* This means that this class owns the RCLASS_SUPERCLASSES list.
* if !SHAPE_IN_BASIC_FLAGS
* 4-19: SHAPE_FLAG_MASK
* Shape ID for the class.
* endif
*/
/* Flags of T_ICLASS
*
* 0: RICLASS_IS_ORIGIN
* 3: RICLASS_ORIGIN_SHARED_MTBL
* The T_ICLASS does not own the method table.
* if !SHAPE_IN_BASIC_FLAGS
* 4-19: SHAPE_FLAG_MASK
* Shape ID. This is set but not used.
* endif
*/
/* Flags of T_MODULE
*
* 1: RMODULE_ALLOCATED_BUT_NOT_INITIALIZED
* Module has not been initialized.
* 2: RCLASS_SUPERCLASSES_INCLUDE_SELF
* See RCLASS_SUPERCLASSES_INCLUDE_SELF in T_CLASS.
* 3: RMODULE_IS_REFINEMENT
* Module is used for refinements.
* if !SHAPE_IN_BASIC_FLAGS
* 4-19: SHAPE_FLAG_MASK
* Shape ID for the module.
* endif
*/
#define METACLASS_OF(k) RBASIC(k)->klass
#define SET_METACLASS_OF(k, cls) RBASIC_SET_CLASS(k, cls)
RUBY_EXTERN rb_serial_t ruby_vm_global_cvar_state;
static rb_subclass_entry_t *
push_subclass_entry_to_list(VALUE super, VALUE klass)
{
rb_subclass_entry_t *entry, *head;
entry = ZALLOC(rb_subclass_entry_t);
entry->klass = klass;
head = RCLASS_SUBCLASSES(super);
if (!head) {
head = ZALLOC(rb_subclass_entry_t);
RCLASS_SUBCLASSES(super) = head;
}
entry->next = head->next;
entry->prev = head;
if (head->next) {
head->next->prev = entry;
}
head->next = entry;
return entry;
}
void
rb_class_subclass_add(VALUE super, VALUE klass)
{
if (super && !UNDEF_P(super)) {
rb_subclass_entry_t *entry = push_subclass_entry_to_list(super, klass);
RCLASS_SUBCLASS_ENTRY(klass) = entry;
}
}
static void
rb_module_add_to_subclasses_list(VALUE module, VALUE iclass)
{
rb_subclass_entry_t *entry = push_subclass_entry_to_list(module, iclass);
RCLASS_MODULE_SUBCLASS_ENTRY(iclass) = entry;
}
void
rb_class_remove_subclass_head(VALUE klass)
{
rb_subclass_entry_t *head = RCLASS_SUBCLASSES(klass);
if (head) {
if (head->next) {
head->next->prev = NULL;
}
RCLASS_SUBCLASSES(klass) = NULL;
xfree(head);
}
}
void
rb_class_remove_from_super_subclasses(VALUE klass)
{
rb_subclass_entry_t *entry = RCLASS_SUBCLASS_ENTRY(klass);
if (entry) {
rb_subclass_entry_t *prev = entry->prev, *next = entry->next;
if (prev) {
prev->next = next;
}
if (next) {
next->prev = prev;
}
xfree(entry);
}
RCLASS_SUBCLASS_ENTRY(klass) = NULL;
}
void
rb_class_remove_from_module_subclasses(VALUE klass)
{
rb_subclass_entry_t *entry = RCLASS_MODULE_SUBCLASS_ENTRY(klass);
if (entry) {
rb_subclass_entry_t *prev = entry->prev, *next = entry->next;
if (prev) {
prev->next = next;
}
if (next) {
next->prev = prev;
}
xfree(entry);
}
RCLASS_MODULE_SUBCLASS_ENTRY(klass) = NULL;
}
void
rb_class_foreach_subclass(VALUE klass, void (*f)(VALUE, VALUE), VALUE arg)
{
// RCLASS_SUBCLASSES should always point to our head element which has NULL klass
rb_subclass_entry_t *cur = RCLASS_SUBCLASSES(klass);
// if we have a subclasses list, then the head is a placeholder with no valid
// class. So ignore it and use the next element in the list (if one exists)
if (cur) {
RUBY_ASSERT(!cur->klass);
cur = cur->next;
}
/* do not be tempted to simplify this loop into a for loop, the order of
operations is important here if `f` modifies the linked list */
while (cur) {
VALUE curklass = cur->klass;
cur = cur->next;
// do not trigger GC during f, otherwise the cur will become
// a dangling pointer if the subclass is collected
f(curklass, arg);
}
}
static void
class_detach_subclasses(VALUE klass, VALUE arg)
{
rb_class_remove_from_super_subclasses(klass);
}
void
rb_class_detach_subclasses(VALUE klass)
{
rb_class_foreach_subclass(klass, class_detach_subclasses, Qnil);
}
static void
class_detach_module_subclasses(VALUE klass, VALUE arg)
{
rb_class_remove_from_module_subclasses(klass);
}
void
rb_class_detach_module_subclasses(VALUE klass)
{
rb_class_foreach_subclass(klass, class_detach_module_subclasses, Qnil);
}
/**
* Allocates a struct RClass for a new class.
*
* \param flags initial value for basic.flags of the returned class.
* \param klass the class of the returned class.
* \return an uninitialized Class object.
* \pre \p klass must refer \c Class class or an ancestor of Class.
* \pre \code (flags | T_CLASS) != 0 \endcode
* \post the returned class can safely be \c #initialize 'd.
*
* \note this function is not Class#allocate.
*/
static VALUE
class_alloc(VALUE flags, VALUE klass)
{
size_t alloc_size = sizeof(struct RClass) + sizeof(rb_classext_t);
flags &= T_MASK;
flags |= FL_PROMOTED1 /* start from age == 2 */;
if (RGENGC_WB_PROTECTED_CLASS) flags |= FL_WB_PROTECTED;
NEWOBJ_OF(obj, struct RClass, klass, flags, alloc_size, 0);
memset(RCLASS_EXT(obj), 0, sizeof(rb_classext_t));
/* ZALLOC
RCLASS_CONST_TBL(obj) = 0;
RCLASS_M_TBL(obj) = 0;
RCLASS_IV_INDEX_TBL(obj) = 0;
RCLASS_SET_SUPER((VALUE)obj, 0);
RCLASS_SUBCLASSES(obj) = NULL;
RCLASS_PARENT_SUBCLASSES(obj) = NULL;
RCLASS_MODULE_SUBCLASSES(obj) = NULL;
*/
RCLASS_SET_ORIGIN((VALUE)obj, (VALUE)obj);
RB_OBJ_WRITE(obj, &RCLASS_REFINED_CLASS(obj), Qnil);
RCLASS_SET_ALLOCATOR((VALUE)obj, NULL);
return (VALUE)obj;
}
static void
RCLASS_M_TBL_INIT(VALUE c)
{
RCLASS_M_TBL(c) = rb_id_table_create(0);
}
/*!
* A utility function that wraps class_alloc.
*
* allocates a class and initializes safely.
* \param super a class from which the new class derives.
* \return a class object.
* \pre \a super must be a class.
* \post the metaclass of the new class is Class.
*/
VALUE
rb_class_boot(VALUE super)
{
VALUE klass = class_alloc(T_CLASS, rb_cClass);
RCLASS_SET_SUPER(klass, super);
RCLASS_M_TBL_INIT(klass);
return (VALUE)klass;
}
static VALUE *
class_superclasses_including_self(VALUE klass)
{
if (FL_TEST_RAW(klass, RCLASS_SUPERCLASSES_INCLUDE_SELF))
return RCLASS_SUPERCLASSES(klass);
size_t depth = RCLASS_SUPERCLASS_DEPTH(klass);
VALUE *superclasses = xmalloc(sizeof(VALUE) * (depth + 1));
if (depth > 0)
memcpy(superclasses, RCLASS_SUPERCLASSES(klass), sizeof(VALUE) * depth);
superclasses[depth] = klass;
RCLASS_SUPERCLASSES(klass) = superclasses;
FL_SET_RAW(klass, RCLASS_SUPERCLASSES_INCLUDE_SELF);
return superclasses;
}
void
rb_class_update_superclasses(VALUE klass)
{
VALUE super = RCLASS_SUPER(klass);
if (!RB_TYPE_P(klass, T_CLASS)) return;
if (UNDEF_P(super)) return;
// If the superclass array is already built
if (RCLASS_SUPERCLASSES(klass))
return;
// find the proper superclass
while (super != Qfalse && !RB_TYPE_P(super, T_CLASS)) {
super = RCLASS_SUPER(super);
}
// For BasicObject and uninitialized classes, depth=0 and ary=NULL
if (super == Qfalse)
return;
// Sometimes superclasses are set before the full ancestry tree is built
// This happens during metaclass construction
if (super != rb_cBasicObject && !RCLASS_SUPERCLASS_DEPTH(super)) {
rb_class_update_superclasses(super);
// If it is still unset we need to try later
if (!RCLASS_SUPERCLASS_DEPTH(super))
return;
}
RCLASS_SUPERCLASSES(klass) = class_superclasses_including_self(super);
RCLASS_SUPERCLASS_DEPTH(klass) = RCLASS_SUPERCLASS_DEPTH(super) + 1;
}
void
rb_check_inheritable(VALUE super)
{
if (!RB_TYPE_P(super, T_CLASS)) {
rb_raise(rb_eTypeError, "superclass must be an instance of Class (given an instance of %"PRIsVALUE")",
rb_obj_class(super));
}
if (RBASIC(super)->flags & FL_SINGLETON) {
rb_raise(rb_eTypeError, "can't make subclass of singleton class");
}
if (super == rb_cClass) {
rb_raise(rb_eTypeError, "can't make subclass of Class");
}
}
VALUE
rb_class_new(VALUE super)
{
Check_Type(super, T_CLASS);
rb_check_inheritable(super);
VALUE klass = rb_class_boot(super);
if (super != rb_cObject && super != rb_cBasicObject) {
RCLASS_EXT(klass)->max_iv_count = RCLASS_EXT(super)->max_iv_count;
}
return klass;
}
VALUE
rb_class_s_alloc(VALUE klass)
{
return rb_class_boot(0);
}
static void
clone_method(VALUE old_klass, VALUE new_klass, ID mid, const rb_method_entry_t *me)
{
if (me->def->type == VM_METHOD_TYPE_ISEQ) {
rb_cref_t *new_cref;
rb_vm_rewrite_cref(me->def->body.iseq.cref, old_klass, new_klass, &new_cref);
rb_add_method_iseq(new_klass, mid, me->def->body.iseq.iseqptr, new_cref, METHOD_ENTRY_VISI(me));
}
else {
rb_method_entry_set(new_klass, mid, me, METHOD_ENTRY_VISI(me));
}
}
struct clone_method_arg {
VALUE new_klass;
VALUE old_klass;
};
static enum rb_id_table_iterator_result
clone_method_i(ID key, VALUE value, void *data)
{
const struct clone_method_arg *arg = (struct clone_method_arg *)data;
clone_method(arg->old_klass, arg->new_klass, key, (const rb_method_entry_t *)value);
return ID_TABLE_CONTINUE;
}
struct clone_const_arg {
VALUE klass;
struct rb_id_table *tbl;
};
static int
clone_const(ID key, const rb_const_entry_t *ce, struct clone_const_arg *arg)
{
rb_const_entry_t *nce = ALLOC(rb_const_entry_t);
MEMCPY(nce, ce, rb_const_entry_t, 1);
RB_OBJ_WRITTEN(arg->klass, Qundef, ce->value);
RB_OBJ_WRITTEN(arg->klass, Qundef, ce->file);
rb_id_table_insert(arg->tbl, key, (VALUE)nce);
return ID_TABLE_CONTINUE;
}
static enum rb_id_table_iterator_result
clone_const_i(ID key, VALUE value, void *data)
{
return clone_const(key, (const rb_const_entry_t *)value, data);
}
static void
class_init_copy_check(VALUE clone, VALUE orig)
{
if (orig == rb_cBasicObject) {
rb_raise(rb_eTypeError, "can't copy the root class");
}
if (RCLASS_SUPER(clone) != 0 || clone == rb_cBasicObject) {
rb_raise(rb_eTypeError, "already initialized class");
}
if (FL_TEST(orig, FL_SINGLETON)) {
rb_raise(rb_eTypeError, "can't copy singleton class");
}
}
struct cvc_table_copy_ctx {
VALUE clone;
struct rb_id_table * new_table;
};
static enum rb_id_table_iterator_result
cvc_table_copy(ID id, VALUE val, void *data)
{
struct cvc_table_copy_ctx *ctx = (struct cvc_table_copy_ctx *)data;
struct rb_cvar_class_tbl_entry * orig_entry;
orig_entry = (struct rb_cvar_class_tbl_entry *)val;
struct rb_cvar_class_tbl_entry *ent;
ent = ALLOC(struct rb_cvar_class_tbl_entry);
ent->class_value = ctx->clone;
ent->global_cvar_state = orig_entry->global_cvar_state;
rb_id_table_insert(ctx->new_table, id, (VALUE)ent);
return ID_TABLE_CONTINUE;
}
static void
copy_tables(VALUE clone, VALUE orig)
{
if (RCLASS_CONST_TBL(clone)) {
rb_free_const_table(RCLASS_CONST_TBL(clone));
RCLASS_CONST_TBL(clone) = 0;
}
if (RCLASS_CVC_TBL(orig)) {
struct rb_id_table *rb_cvc_tbl = RCLASS_CVC_TBL(orig);
struct rb_id_table *rb_cvc_tbl_dup = rb_id_table_create(rb_id_table_size(rb_cvc_tbl));
struct cvc_table_copy_ctx ctx;
ctx.clone = clone;
ctx.new_table = rb_cvc_tbl_dup;
rb_id_table_foreach(rb_cvc_tbl, cvc_table_copy, &ctx);
RCLASS_CVC_TBL(clone) = rb_cvc_tbl_dup;
}
RCLASS_M_TBL(clone) = 0;
if (!RB_TYPE_P(clone, T_ICLASS)) {
st_data_t id;
rb_iv_tbl_copy(clone, orig);
CONST_ID(id, "__tmp_classpath__");
rb_attr_delete(clone, id);
CONST_ID(id, "__classpath__");
rb_attr_delete(clone, id);
}
if (RCLASS_CONST_TBL(orig)) {
struct clone_const_arg arg;
arg.tbl = RCLASS_CONST_TBL(clone) = rb_id_table_create(0);
arg.klass = clone;
rb_id_table_foreach(RCLASS_CONST_TBL(orig), clone_const_i, &arg);
}
}
static bool ensure_origin(VALUE klass);
/**
* If this flag is set, that module is allocated but not initialized yet.
*/
enum {RMODULE_ALLOCATED_BUT_NOT_INITIALIZED = RUBY_FL_USER1};
static inline bool
RMODULE_UNINITIALIZED(VALUE module)
{
return FL_TEST_RAW(module, RMODULE_ALLOCATED_BUT_NOT_INITIALIZED);
}
void
rb_module_set_initialized(VALUE mod)
{
FL_UNSET_RAW(mod, RMODULE_ALLOCATED_BUT_NOT_INITIALIZED);
/* no more re-initialization */
}
void
rb_module_check_initializable(VALUE mod)
{
if (!RMODULE_UNINITIALIZED(mod)) {
rb_raise(rb_eTypeError, "already initialized module");
}
}
/* :nodoc: */
VALUE
rb_mod_init_copy(VALUE clone, VALUE orig)
{
switch (BUILTIN_TYPE(clone)) {
case T_CLASS:
case T_ICLASS:
class_init_copy_check(clone, orig);
break;
case T_MODULE:
rb_module_check_initializable(clone);
break;
default:
break;
}
if (!OBJ_INIT_COPY(clone, orig)) return clone;
/* cloned flag is refer at constant inline cache
* see vm_get_const_key_cref() in vm_insnhelper.c
*/
RCLASS_EXT(clone)->cloned = true;
RCLASS_EXT(orig)->cloned = true;
if (!FL_TEST(CLASS_OF(clone), FL_SINGLETON)) {
RBASIC_SET_CLASS(clone, rb_singleton_class_clone(orig));
rb_singleton_class_attached(METACLASS_OF(clone), (VALUE)clone);
}
RCLASS_SET_ALLOCATOR(clone, RCLASS_ALLOCATOR(orig));
copy_tables(clone, orig);
if (RCLASS_M_TBL(orig)) {
struct clone_method_arg arg;
arg.old_klass = orig;
arg.new_klass = clone;
RCLASS_M_TBL_INIT(clone);
rb_id_table_foreach(RCLASS_M_TBL(orig), clone_method_i, &arg);
}
if (RCLASS_ORIGIN(orig) == orig) {
RCLASS_SET_SUPER(clone, RCLASS_SUPER(orig));
}
else {
VALUE p = RCLASS_SUPER(orig);
VALUE orig_origin = RCLASS_ORIGIN(orig);
VALUE prev_clone_p = clone;
VALUE origin_stack = rb_ary_hidden_new(2);
VALUE origin[2];
VALUE clone_p = 0;
long origin_len;
int add_subclass;
VALUE clone_origin;
ensure_origin(clone);
clone_origin = RCLASS_ORIGIN(clone);
while (p && p != orig_origin) {
if (BUILTIN_TYPE(p) != T_ICLASS) {
rb_bug("non iclass between module/class and origin");
}
clone_p = class_alloc(RBASIC(p)->flags, METACLASS_OF(p));
RCLASS_SET_SUPER(prev_clone_p, clone_p);
prev_clone_p = clone_p;
RCLASS_M_TBL(clone_p) = RCLASS_M_TBL(p);
RCLASS_CONST_TBL(clone_p) = RCLASS_CONST_TBL(p);
RCLASS_SET_ALLOCATOR(clone_p, RCLASS_ALLOCATOR(p));
if (RB_TYPE_P(clone, T_CLASS)) {
RCLASS_SET_INCLUDER(clone_p, clone);
}
add_subclass = TRUE;
if (p != RCLASS_ORIGIN(p)) {
origin[0] = clone_p;
origin[1] = RCLASS_ORIGIN(p);
rb_ary_cat(origin_stack, origin, 2);
}
else if ((origin_len = RARRAY_LEN(origin_stack)) > 1 &&
RARRAY_AREF(origin_stack, origin_len - 1) == p) {
RCLASS_SET_ORIGIN(RARRAY_AREF(origin_stack, (origin_len -= 2)), clone_p);
RICLASS_SET_ORIGIN_SHARED_MTBL(clone_p);
rb_ary_resize(origin_stack, origin_len);
add_subclass = FALSE;
}
if (add_subclass) {
rb_module_add_to_subclasses_list(METACLASS_OF(p), clone_p);
}
p = RCLASS_SUPER(p);
}
if (p == orig_origin) {
if (clone_p) {
RCLASS_SET_SUPER(clone_p, clone_origin);
RCLASS_SET_SUPER(clone_origin, RCLASS_SUPER(orig_origin));
}
copy_tables(clone_origin, orig_origin);
if (RCLASS_M_TBL(orig_origin)) {
struct clone_method_arg arg;
arg.old_klass = orig;
arg.new_klass = clone;
RCLASS_M_TBL_INIT(clone_origin);
rb_id_table_foreach(RCLASS_M_TBL(orig_origin), clone_method_i, &arg);
}
}
else {
rb_bug("no origin for class that has origin");
}
rb_class_update_superclasses(clone);
}
return clone;
}
VALUE
rb_singleton_class_clone(VALUE obj)
{
return rb_singleton_class_clone_and_attach(obj, Qundef);
}
// Clone and return the singleton class of `obj` if it has been created and is attached to `obj`.
VALUE
rb_singleton_class_clone_and_attach(VALUE obj, VALUE attach)
{
const VALUE klass = METACLASS_OF(obj);
// Note that `rb_singleton_class()` can create situations where `klass` is
// attached to an object other than `obj`. In which case `obj` does not have
// a material singleton class attached yet and there is no singleton class
// to clone.
if (!(FL_TEST(klass, FL_SINGLETON) && RCLASS_ATTACHED_OBJECT(klass) == obj)) {
// nothing to clone
return klass;
}
else {
/* copy singleton(unnamed) class */
bool klass_of_clone_is_new;
VALUE clone = class_alloc(RBASIC(klass)->flags, 0);
if (BUILTIN_TYPE(obj) == T_CLASS) {
klass_of_clone_is_new = true;
RBASIC_SET_CLASS(clone, clone);
}
else {
VALUE klass_metaclass_clone = rb_singleton_class_clone(klass);
// When `METACLASS_OF(klass) == klass_metaclass_clone`, it means the
// recursive call did not clone `METACLASS_OF(klass)`.
klass_of_clone_is_new = (METACLASS_OF(klass) != klass_metaclass_clone);
RBASIC_SET_CLASS(clone, klass_metaclass_clone);
}
RCLASS_SET_SUPER(clone, RCLASS_SUPER(klass));
rb_iv_tbl_copy(clone, klass);
if (RCLASS_CONST_TBL(klass)) {
struct clone_const_arg arg;
arg.tbl = RCLASS_CONST_TBL(clone) = rb_id_table_create(0);
arg.klass = clone;
rb_id_table_foreach(RCLASS_CONST_TBL(klass), clone_const_i, &arg);
}
if (!UNDEF_P(attach)) {
rb_singleton_class_attached(clone, attach);
}
RCLASS_M_TBL_INIT(clone);
{
struct clone_method_arg arg;
arg.old_klass = klass;
arg.new_klass = clone;
rb_id_table_foreach(RCLASS_M_TBL(klass), clone_method_i, &arg);
}
if (klass_of_clone_is_new) {
rb_singleton_class_attached(METACLASS_OF(clone), clone);
}
FL_SET(clone, FL_SINGLETON);
return clone;
}
}
void
rb_singleton_class_attached(VALUE klass, VALUE obj)
{
if (FL_TEST(klass, FL_SINGLETON)) {
RCLASS_SET_ATTACHED_OBJECT(klass, obj);
}
}
/*!
* whether k is a meta^(n)-class of Class class
* @retval 1 if \a k is a meta^(n)-class of Class class (n >= 0)
* @retval 0 otherwise
*/
#define META_CLASS_OF_CLASS_CLASS_P(k) (METACLASS_OF(k) == (k))
static int
rb_singleton_class_has_metaclass_p(VALUE sklass)
{
return RCLASS_ATTACHED_OBJECT(METACLASS_OF(sklass)) == sklass;
}
int
rb_singleton_class_internal_p(VALUE sklass)
{
return (RB_TYPE_P(RCLASS_ATTACHED_OBJECT(sklass), T_CLASS) &&
!rb_singleton_class_has_metaclass_p(sklass));
}
/*!
* whether k has a metaclass
* @retval 1 if \a k has a metaclass
* @retval 0 otherwise
*/
#define HAVE_METACLASS_P(k) \
(FL_TEST(METACLASS_OF(k), FL_SINGLETON) && \
rb_singleton_class_has_metaclass_p(k))
/*!
* ensures \a klass belongs to its own eigenclass.
* @return the eigenclass of \a klass
* @post \a klass belongs to the returned eigenclass.
* i.e. the attached object of the eigenclass is \a klass.
* @note this macro creates a new eigenclass if necessary.
*/
#define ENSURE_EIGENCLASS(klass) \
(HAVE_METACLASS_P(klass) ? METACLASS_OF(klass) : make_metaclass(klass))
/*!
* Creates a metaclass of \a klass
* \param klass a class
* \return created metaclass for the class
* \pre \a klass is a Class object
* \pre \a klass has no singleton class.
* \post the class of \a klass is the returned class.
* \post the returned class is meta^(n+1)-class when \a klass is a meta^(n)-klass for n >= 0
*/
static inline VALUE
make_metaclass(VALUE klass)
{
VALUE super;
VALUE metaclass = rb_class_boot(Qundef);
FL_SET(metaclass, FL_SINGLETON);
rb_singleton_class_attached(metaclass, klass);
if (META_CLASS_OF_CLASS_CLASS_P(klass)) {
SET_METACLASS_OF(klass, metaclass);
SET_METACLASS_OF(metaclass, metaclass);
}
else {
VALUE tmp = METACLASS_OF(klass); /* for a meta^(n)-class klass, tmp is meta^(n)-class of Class class */
SET_METACLASS_OF(klass, metaclass);
SET_METACLASS_OF(metaclass, ENSURE_EIGENCLASS(tmp));
}
super = RCLASS_SUPER(klass);
while (RB_TYPE_P(super, T_ICLASS)) super = RCLASS_SUPER(super);
RCLASS_SET_SUPER(metaclass, super ? ENSURE_EIGENCLASS(super) : rb_cClass);
// Full class ancestry may not have been filled until we reach here.
rb_class_update_superclasses(METACLASS_OF(metaclass));
return metaclass;
}
/*!
* Creates a singleton class for \a obj.
* \pre \a obj must not a immediate nor a special const.
* \pre \a obj must not a Class object.
* \pre \a obj has no singleton class.
*/
static inline VALUE
make_singleton_class(VALUE obj)
{
VALUE orig_class = METACLASS_OF(obj);
VALUE klass = rb_class_boot(orig_class);
FL_SET(klass, FL_SINGLETON);
RBASIC_SET_CLASS(obj, klass);
rb_singleton_class_attached(klass, obj);
SET_METACLASS_OF(klass, METACLASS_OF(rb_class_real(orig_class)));
return klass;
}
static VALUE
boot_defclass(const char *name, VALUE super)
{
VALUE obj = rb_class_boot(super);
ID id = rb_intern(name);
rb_const_set((rb_cObject ? rb_cObject : obj), id, obj);
rb_vm_add_root_module(obj);
return obj;
}
/***********************************************************************
*
* Document-class: Refinement
*
* Refinement is a class of the +self+ (current context) inside +refine+
* statement. It allows to import methods from other modules, see #import_methods.
*/
#if 0 /* for RDoc */
/*
* Document-method: Refinement#import_methods
*
* call-seq:
* import_methods(module, ...) -> self
*
* Imports methods from modules. Unlike Module#include,
* Refinement#import_methods copies methods and adds them into the refinement,
* so the refinement is activated in the imported methods.
*
* Note that due to method copying, only methods defined in Ruby code can be imported.
*
* module StrUtils
* def indent(level)
* ' ' * level + self
* end
* end
*
* module M
* refine String do
* import_methods StrUtils
* end
* end
*
* using M
* "foo".indent(3)
* #=> " foo"
*
* module M
* refine String do
* import_methods Enumerable
* # Can't import method which is not defined with Ruby code: Enumerable#drop
* end
* end
*
*/
static VALUE
refinement_import_methods(int argc, VALUE *argv, VALUE refinement)
{
}
# endif
/*!
*--
* \private
* Initializes the world of objects and classes.
*
* At first, the function bootstraps the class hierarchy.
* It initializes the most fundamental classes and their metaclasses.
* - \c BasicObject
* - \c Object
* - \c Module
* - \c Class
* After the bootstrap step, the class hierarchy becomes as the following
* diagram.
*
* \image html boottime-classes.png
*
* Then, the function defines classes, modules and methods as usual.
* \ingroup class
*++
*/
void
Init_class_hierarchy(void)
{
rb_cBasicObject = boot_defclass("BasicObject", 0);
rb_cObject = boot_defclass("Object", rb_cBasicObject);
rb_gc_register_mark_object(rb_cObject);
/* resolve class name ASAP for order-independence */
rb_set_class_path_string(rb_cObject, rb_cObject, rb_fstring_lit("Object"));
rb_cModule = boot_defclass("Module", rb_cObject);
rb_cClass = boot_defclass("Class", rb_cModule);
rb_cRefinement = boot_defclass("Refinement", rb_cModule);
#if 0 /* for RDoc */
// we pretend it to be public, otherwise RDoc will ignore it
rb_define_method(rb_cRefinement, "import_methods", refinement_import_methods, -1);
#endif
rb_const_set(rb_cObject, rb_intern_const("BasicObject"), rb_cBasicObject);
RBASIC_SET_CLASS(rb_cClass, rb_cClass);
RBASIC_SET_CLASS(rb_cModule, rb_cClass);
RBASIC_SET_CLASS(rb_cObject, rb_cClass);
RBASIC_SET_CLASS(rb_cRefinement, rb_cClass);
RBASIC_SET_CLASS(rb_cBasicObject, rb_cClass);
ENSURE_EIGENCLASS(rb_cRefinement);
}
/*!
* \internal
* Creates a new *singleton class* for an object.
*
* \pre \a obj has no singleton class.
* \note DO NOT USE the function in an extension libraries. Use \ref rb_singleton_class.
* \param obj An object.
* \param unused ignored.
* \return The singleton class of the object.
*/
VALUE
rb_make_metaclass(VALUE obj, VALUE unused)
{
if (BUILTIN_TYPE(obj) == T_CLASS) {
return make_metaclass(obj);
}
else {
return make_singleton_class(obj);
}
}
VALUE
rb_define_class_id(ID id, VALUE super)
{
VALUE klass;
if (!super) super = rb_cObject;
klass = rb_class_new(super);
rb_make_metaclass(klass, METACLASS_OF(super));
return klass;
}
/*!
* Calls Class#inherited.
* \param super A class which will be called #inherited.
* NULL means Object class.
* \param klass A Class object which derived from \a super
* \return the value \c Class#inherited's returns
* \pre Each of \a super and \a klass must be a \c Class object.
*/
VALUE
rb_class_inherited(VALUE super, VALUE klass)
{
ID inherited;
if (!super) super = rb_cObject;
CONST_ID(inherited, "inherited");
return rb_funcall(super, inherited, 1, klass);
}
VALUE
rb_define_class(const char *name, VALUE super)
{
VALUE klass;
ID id;
id = rb_intern(name);
if (rb_const_defined(rb_cObject, id)) {
klass = rb_const_get(rb_cObject, id);
if (!RB_TYPE_P(klass, T_CLASS)) {
rb_raise(rb_eTypeError, "%s is not a class (%"PRIsVALUE")",
name, rb_obj_class(klass));
}
if (rb_class_real(RCLASS_SUPER(klass)) != super) {
rb_raise(rb_eTypeError, "superclass mismatch for class %s", name);
}
/* Class may have been defined in Ruby and not pin-rooted */
rb_vm_add_root_module(klass);
return klass;
}
if (!super) {
rb_raise(rb_eArgError, "no super class for `%s'", name);
}
klass = rb_define_class_id(id, super);
rb_vm_add_root_module(klass);
rb_const_set(rb_cObject, id, klass);
rb_class_inherited(super, klass);
return klass;
}
VALUE
rb_define_class_under(VALUE outer, const char *name, VALUE super)
{
return rb_define_class_id_under(outer, rb_intern(name), super);