ObjFW  Diff

Differences From Artifact [93b6de8609]:

To Artifact [a72b4d25e1]:


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
static struct objc_sparsearray *fastPath = NULL;

static void
registerClass(Class class)
{
	if (classes == NULL)
		classes = objc_hashtable_new(
		    objc_hash_string, objc_equal_string, 2);

	objc_hashtable_set(classes, class->name, class);

	if (emptyDTable == NULL)
		emptyDTable = objc_dtable_new();

	class->DTable = emptyDTable;
	class->isa->DTable = emptyDTable;

	if (strcmp(class->name, "Protocol") != 0)
		classesCount++;
}

bool
class_registerAlias_np(Class class, const char *name)
{
	objc_global_mutex_lock();

	if (classes == NULL) {
		objc_global_mutex_unlock();

		return NO;
	}

	objc_hashtable_set(classes, name, (Class)((uintptr_t)class | 1));

	objc_global_mutex_unlock();

	return YES;
}

static void
registerSelectors(Class class)
{
	struct objc_method_list *iter;
	unsigned int i;

	for (iter = class->methodList; iter != NULL; iter = iter->next)
		for (i = 0; i < iter->count; i++)
			objc_register_selector(&iter->methods[i].selector);
}

Class
objc_classname_to_class(const char *name, bool cache)
{
	Class class;

	if (classes == NULL)
		return Nil;

	/*







|






|
|








|


|






|












|



|







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
static struct objc_sparsearray *fastPath = NULL;

static void
registerClass(Class class)
{
	if (classes == NULL)
		classes = objc_hashtable_new(
		    objc_string_hash, objc_string_equal, 2);

	objc_hashtable_set(classes, class->name, class);

	if (emptyDTable == NULL)
		emptyDTable = objc_dtable_new();

	class->dTable = emptyDTable;
	class->isa->dTable = emptyDTable;

	if (strcmp(class->name, "Protocol") != 0)
		classesCount++;
}

bool
class_registerAlias_np(Class class, const char *name)
{
	objc_globalMutex_lock();

	if (classes == NULL) {
		objc_globalMutex_unlock();

		return NO;
	}

	objc_hashtable_set(classes, name, (Class)((uintptr_t)class | 1));

	objc_globalMutex_unlock();

	return YES;
}

static void
registerSelectors(Class class)
{
	struct objc_method_list *iter;
	unsigned int i;

	for (iter = class->methodList; iter != NULL; iter = iter->next)
		for (i = 0; i < iter->count; i++)
			objc_registerSelector(&iter->methods[i].selector);
}

Class
objc_classnameToClass(const char *name, bool cache)
{
	Class class;

	if (classes == NULL)
		return Nil;

	/*
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
	if (cache && fastPath != NULL) {
		class = objc_sparsearray_get(fastPath, (uintptr_t)name);

		if (class != Nil)
			return class;
	}

	objc_global_mutex_lock();

	class = (Class)((uintptr_t)objc_hashtable_get(classes, name) & ~1);

	if (cache && fastPath == NULL && --lookupsUntilFastPath == 0)
		fastPath = objc_sparsearray_new(sizeof(uintptr_t));

	if (cache && fastPath != NULL)
		objc_sparsearray_set(fastPath, (uintptr_t)name, class);

	objc_global_mutex_unlock();

	return class;
}

static void
callSelector(Class class, SEL selector)
{







|









|







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
	if (cache && fastPath != NULL) {
		class = objc_sparsearray_get(fastPath, (uintptr_t)name);

		if (class != Nil)
			return class;
	}

	objc_globalMutex_lock();

	class = (Class)((uintptr_t)objc_hashtable_get(classes, name) & ~1);

	if (cache && fastPath == NULL && --lookupsUntilFastPath == 0)
		fastPath = objc_sparsearray_new(sizeof(uintptr_t));

	if (cache && fastPath != NULL)
		objc_sparsearray_set(fastPath, (uintptr_t)name, class);

	objc_globalMutex_unlock();

	return class;
}

static void
callSelector(Class class, SEL selector)
{
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

	callSelector(class, loadSel);

	class->info |= OBJC_CLASS_INFO_LOADED;
}

void
objc_update_dtable(Class class)
{
	struct objc_category **categories;

	if (!(class->info & OBJC_CLASS_INFO_DTABLE))
		return;

	if (class->DTable == emptyDTable)
		class->DTable = objc_dtable_new();

	if (class->superclass != Nil)
		objc_dtable_copy(class->DTable, class->superclass->DTable);

	for (struct objc_method_list *methodList = class->methodList;
	    methodList != NULL; methodList = methodList->next)
		for (unsigned int i = 0; i < methodList->count; i++)
			objc_dtable_set(class->DTable,
			    (uint32_t)methodList->methods[i].selector.UID,
			    methodList->methods[i].implementation);

	if ((categories = objc_categories_for_class(class)) != NULL) {
		for (unsigned int i = 0; categories[i] != NULL; i++) {
			struct objc_method_list *methodList =
			    (class->info & OBJC_CLASS_INFO_CLASS
			    ? categories[i]->instanceMethods
			    : categories[i]->classMethods);

			for (; methodList != NULL;
			    methodList = methodList->next)
				for (unsigned int j = 0;
				    j < methodList->count; j++)
					objc_dtable_set(class->DTable,
					    (uint32_t)methodList->methods[j]
					    .selector.UID,
					    methodList->methods[j]
					    .implementation);
		}
	}

	if (class->subclassList != NULL)
		for (Class *iter = class->subclassList; *iter != NULL; iter++)
			objc_update_dtable(*iter);
}

static void
addSubclass(Class class)
{
	size_t i;








|






|
|


|




|



|










|









|







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

	callSelector(class, loadSel);

	class->info |= OBJC_CLASS_INFO_LOADED;
}

void
objc_updateDTable(Class class)
{
	struct objc_category **categories;

	if (!(class->info & OBJC_CLASS_INFO_DTABLE))
		return;

	if (class->dTable == emptyDTable)
		class->dTable = objc_dtable_new();

	if (class->superclass != Nil)
		objc_dtable_copy(class->dTable, class->superclass->dTable);

	for (struct objc_method_list *methodList = class->methodList;
	    methodList != NULL; methodList = methodList->next)
		for (unsigned int i = 0; i < methodList->count; i++)
			objc_dtable_set(class->dTable,
			    (uint32_t)methodList->methods[i].selector.UID,
			    methodList->methods[i].implementation);

	if ((categories = objc_categoriesForClass(class)) != NULL) {
		for (unsigned int i = 0; categories[i] != NULL; i++) {
			struct objc_method_list *methodList =
			    (class->info & OBJC_CLASS_INFO_CLASS
			    ? categories[i]->instanceMethods
			    : categories[i]->classMethods);

			for (; methodList != NULL;
			    methodList = methodList->next)
				for (unsigned int j = 0;
				    j < methodList->count; j++)
					objc_dtable_set(class->dTable,
					    (uint32_t)methodList->methods[j]
					    .selector.UID,
					    methodList->methods[j]
					    .implementation);
		}
	}

	if (class->subclassList != NULL)
		for (Class *iter = class->subclassList; *iter != NULL; iter++)
			objc_updateDTable(*iter);
}

static void
addSubclass(Class class)
{
	size_t i;

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
		}
	} else
		for (unsigned int i = 0; i < class->ivars->count; i++)
			*class->ivarOffsets[i] = class->ivars->ivars[i].offset;
}

static void
setupClass(Class class)
{
	const char *superclassName;

	if (class->info & OBJC_CLASS_INFO_SETUP)
		return;

	superclassName = (const char *)class->superclass;
	if (superclassName != NULL) {
		Class super = objc_classname_to_class(superclassName, false);
		Class rootClass;

		if (super == Nil)
			return;

		setupClass(super);

		if (!(super->info & OBJC_CLASS_INFO_SETUP))
			return;

		/*
		 * GCC sets class->isa->isa to the name of the root class,
		 * while Clang just sets it to Nil. Therefore always calculate







|








|





|







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
		}
	} else
		for (unsigned int i = 0; i < class->ivars->count; i++)
			*class->ivarOffsets[i] = class->ivars->ivars[i].offset;
}

static void
setUpClass(Class class)
{
	const char *superclassName;

	if (class->info & OBJC_CLASS_INFO_SETUP)
		return;

	superclassName = (const char *)class->superclass;
	if (superclassName != NULL) {
		Class super = objc_classnameToClass(superclassName, false);
		Class rootClass;

		if (super == Nil)
			return;

		setUpClass(super);

		if (!(super->info & OBJC_CLASS_INFO_SETUP))
			return;

		/*
		 * GCC sets class->isa->isa to the name of the root class,
		 * while Clang just sets it to Nil. Therefore always calculate
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
	 */
	if (class->info & OBJC_CLASS_INFO_INITIALIZED)
		return;

	class->info |= OBJC_CLASS_INFO_DTABLE;
	class->isa->info |= OBJC_CLASS_INFO_DTABLE;

	objc_update_dtable(class);
	objc_update_dtable(class->isa);

	/*
	 * Set it first to prevent calling it recursively due to message sends
	 * in the initialize method
	 */
	class->info |= OBJC_CLASS_INFO_INITIALIZED;
	class->isa->info |= OBJC_CLASS_INFO_INITIALIZED;







|
|







347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
	 */
	if (class->info & OBJC_CLASS_INFO_INITIALIZED)
		return;

	class->info |= OBJC_CLASS_INFO_DTABLE;
	class->isa->info |= OBJC_CLASS_INFO_DTABLE;

	objc_updateDTable(class);
	objc_updateDTable(class->isa);

	/*
	 * Set it first to prevent calling it recursively due to message sends
	 * in the initialize method
	 */
	class->info |= OBJC_CLASS_INFO_INITIALIZED;
	class->isa->info |= OBJC_CLASS_INFO_INITIALIZED;
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
		    objc_msg_lookup(class, initializeSel);

		initialize(class, initializeSel);
	}
}

void
objc_initialize_class(Class class)
{
	if (class->info & OBJC_CLASS_INFO_INITIALIZED)
		return;

	objc_global_mutex_lock();

	/*
	 * It's possible that two threads try to initialize a class at the same
	 * time. Make sure that the thread which held the lock did not already
	 * initialize it.
	 */
	if (class->info & OBJC_CLASS_INFO_INITIALIZED) {
		objc_global_mutex_unlock();
		return;
	}

	setupClass(class);

	if (!(class->info & OBJC_CLASS_INFO_SETUP)) {
		objc_global_mutex_unlock();
		return;
	}

	initializeClass(class);

	objc_global_mutex_unlock();
}

static void
processLoadQueue()
{
	for (size_t i = 0; i < loadQueueCount; i++) {
		setupClass(loadQueue[i]);

		if (loadQueue[i]->info & OBJC_CLASS_INFO_SETUP) {
			callLoad(loadQueue[i]);

			loadQueueCount--;

			if (loadQueueCount == 0) {







|




|







|



|


|





|






|







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
		    objc_msg_lookup(class, initializeSel);

		initialize(class, initializeSel);
	}
}

void
objc_initializeClass(Class class)
{
	if (class->info & OBJC_CLASS_INFO_INITIALIZED)
		return;

	objc_globalMutex_lock();

	/*
	 * It's possible that two threads try to initialize a class at the same
	 * time. Make sure that the thread which held the lock did not already
	 * initialize it.
	 */
	if (class->info & OBJC_CLASS_INFO_INITIALIZED) {
		objc_globalMutex_unlock();
		return;
	}

	setUpClass(class);

	if (!(class->info & OBJC_CLASS_INFO_SETUP)) {
		objc_globalMutex_unlock();
		return;
	}

	initializeClass(class);

	objc_globalMutex_unlock();
}

static void
processLoadQueue()
{
	for (size_t i = 0; i < loadQueueCount; i++) {
		setUpClass(loadQueue[i]);

		if (loadQueue[i]->info & OBJC_CLASS_INFO_SETUP) {
			callLoad(loadQueue[i]);

			loadQueueCount--;

			if (loadQueueCount == 0) {
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
			if (loadQueue == NULL)
				OBJC_ERROR("Not enough memory for load queue!");
		}
	}
}

void
objc_register_all_classes(struct objc_symtab *symtab)
{
	for (uint16_t i = 0; i < symtab->classDefsCount; i++) {
		Class class = (Class)symtab->defs[i];

		registerClass(class);
		registerSelectors(class);
		registerSelectors(class->isa);
	}

	for (uint16_t i = 0; i < symtab->classDefsCount; i++) {
		Class class = (Class)symtab->defs[i];

		if (hasLoad(class)) {
			setupClass(class);

			if (class->info & OBJC_CLASS_INFO_SETUP)
				callLoad(class);
			else {
				loadQueue = realloc(loadQueue,
				    sizeof(Class) * (loadQueueCount + 1));








|













|







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
			if (loadQueue == NULL)
				OBJC_ERROR("Not enough memory for load queue!");
		}
	}
}

void
objc_registerAllClasses(struct objc_symtab *symtab)
{
	for (uint16_t i = 0; i < symtab->classDefsCount; i++) {
		Class class = (Class)symtab->defs[i];

		registerClass(class);
		registerSelectors(class);
		registerSelectors(class->isa);
	}

	for (uint16_t i = 0; i < symtab->classDefsCount; i++) {
		Class class = (Class)symtab->defs[i];

		if (hasLoad(class)) {
			setUpClass(class);

			if (class->info & OBJC_CLASS_INFO_SETUP)
				callLoad(class);
			else {
				loadQueue = realloc(loadQueue,
				    sizeof(Class) * (loadQueueCount + 1));

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

	return class;
}

void
objc_registerClassPair(Class class)
{
	objc_global_mutex_lock();

	registerClass(class);

	if (class->superclass != Nil) {
		addSubclass(class);
		addSubclass(class->isa);
	}

	class->info |= OBJC_CLASS_INFO_SETUP;
	class->isa->info |= OBJC_CLASS_INFO_SETUP;

	if (hasLoad(class))
		callLoad(class);
	else
		class->info |= OBJC_CLASS_INFO_LOADED;

	processLoadQueue();

	objc_global_mutex_unlock();
}

Class
objc_lookUpClass(const char *name)
{
	Class class;

	if ((class = objc_classname_to_class(name, true)) == NULL)
		return Nil;

	if (class->info & OBJC_CLASS_INFO_SETUP)
		return class;

	objc_global_mutex_lock();

	setupClass(class);

	objc_global_mutex_unlock();

	if (!(class->info & OBJC_CLASS_INFO_SETUP))
		return Nil;

	return class;
}








|


















|







|





|

|

|







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

	return class;
}

void
objc_registerClassPair(Class class)
{
	objc_globalMutex_lock();

	registerClass(class);

	if (class->superclass != Nil) {
		addSubclass(class);
		addSubclass(class->isa);
	}

	class->info |= OBJC_CLASS_INFO_SETUP;
	class->isa->info |= OBJC_CLASS_INFO_SETUP;

	if (hasLoad(class))
		callLoad(class);
	else
		class->info |= OBJC_CLASS_INFO_LOADED;

	processLoadQueue();

	objc_globalMutex_unlock();
}

Class
objc_lookUpClass(const char *name)
{
	Class class;

	if ((class = objc_classnameToClass(name, true)) == NULL)
		return Nil;

	if (class->info & OBJC_CLASS_INFO_SETUP)
		return class;

	objc_globalMutex_lock();

	setUpClass(class);

	objc_globalMutex_unlock();

	if (!(class->info & OBJC_CLASS_INFO_SETUP))
		return Nil;

	return class;
}

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
	return objc_getRequiredClass(name);
}

unsigned int
objc_getClassList(Class *buffer, unsigned int count)
{
	unsigned int j;
	objc_global_mutex_lock();

	if (buffer == NULL)
		return classesCount;

	if (classesCount < count)
		count = classesCount;

	j = 0;
	for (uint32_t i = 0; i < classes->size; i++) {
		void *class;

		if (j >= count) {
			objc_global_mutex_unlock();
			return j;
		}

		if (classes->data[i] == NULL)
			continue;

		if (strcmp(classes->data[i]->key, "Protocol") == 0)
			continue;

		class = (Class)classes->data[i]->object;

		if (class == Nil || (uintptr_t)class & 1)
			continue;

		buffer[j++] = class;
	}

	objc_global_mutex_unlock();

	return j;
}

Class *
objc_copyClassList(unsigned int *length)
{
	Class *ret;
	unsigned int count;

	objc_global_mutex_lock();

	if ((ret = malloc((classesCount + 1) * sizeof(Class))) == NULL)
		OBJC_ERROR("Failed to allocate memory for class list!");

	count = objc_getClassList(ret, classesCount);
	OFEnsure(count == classesCount);

	ret[count] = Nil;

	if (length != NULL)
		*length = count;

	objc_global_mutex_unlock();

	return ret;
}

bool
class_isMetaClass(Class class)
{







|












|

















|










|












|







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
	return objc_getRequiredClass(name);
}

unsigned int
objc_getClassList(Class *buffer, unsigned int count)
{
	unsigned int j;
	objc_globalMutex_lock();

	if (buffer == NULL)
		return classesCount;

	if (classesCount < count)
		count = classesCount;

	j = 0;
	for (uint32_t i = 0; i < classes->size; i++) {
		void *class;

		if (j >= count) {
			objc_globalMutex_unlock();
			return j;
		}

		if (classes->data[i] == NULL)
			continue;

		if (strcmp(classes->data[i]->key, "Protocol") == 0)
			continue;

		class = (Class)classes->data[i]->object;

		if (class == Nil || (uintptr_t)class & 1)
			continue;

		buffer[j++] = class;
	}

	objc_globalMutex_unlock();

	return j;
}

Class *
objc_copyClassList(unsigned int *length)
{
	Class *ret;
	unsigned int count;

	objc_globalMutex_lock();

	if ((ret = malloc((classesCount + 1) * sizeof(Class))) == NULL)
		OBJC_ERROR("Failed to allocate memory for class list!");

	count = objc_getClassList(ret, classesCount);
	OFEnsure(count == classesCount);

	ret[count] = Nil;

	if (length != NULL)
		*length = count;

	objc_globalMutex_unlock();

	return ret;
}

bool
class_isMetaClass(Class class)
{
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
}

static struct objc_method *
getMethod(Class class, SEL selector)
{
	struct objc_category **categories;

	if ((categories = objc_categories_for_class(class)) != NULL) {
		for (; *categories != NULL; categories++) {
			struct objc_method_list *methodList =
			    (class->info & OBJC_CLASS_INFO_METACLASS
			    ? (*categories)->classMethods
			    : (*categories)->instanceMethods);

			for (; methodList != NULL;







|







722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
}

static struct objc_method *
getMethod(Class class, SEL selector)
{
	struct objc_category **categories;

	if ((categories = objc_categoriesForClass(class)) != NULL) {
		for (; *categories != NULL; categories++) {
			struct objc_method_list *methodList =
			    (class->info & OBJC_CLASS_INFO_METACLASS
			    ? (*categories)->classMethods
			    : (*categories)->instanceMethods);

			for (; methodList != NULL;
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

static void
addMethod(Class class, SEL selector, IMP implementation,
    const char *typeEncoding)
{
	struct objc_method_list *methodList;

	/* FIXME: We need a way to free this at objc_exit() */
	if ((methodList = malloc(sizeof(*methodList))) == NULL)
		OBJC_ERROR("Not enough memory to replace method!");

	methodList->next = class->methodList;
	methodList->count = 1;
	methodList->methods[0].selector.UID = selector->UID;
	methodList->methods[0].selector.typeEncoding = typeEncoding;
	methodList->methods[0].implementation = implementation;

	class->methodList = methodList;

	objc_update_dtable(class);
}

Method
class_getInstanceMethod(Class class, SEL selector)
{
	Method method;
	Class superclass;

	if (class == Nil)
		return NULL;

	objc_global_mutex_lock();

	if ((method = getMethod(class, selector)) != NULL) {
		objc_global_mutex_unlock();
		return method;
	}

	superclass = class->superclass;

	objc_global_mutex_unlock();

	if (superclass != Nil)
		return class_getInstanceMethod(superclass, selector);

	return NULL;
}

bool
class_addMethod(Class class, SEL selector, IMP implementation,
    const char *typeEncoding)
{
	bool ret;

	objc_global_mutex_lock();

	if (getMethod(class, selector) == NULL) {
		addMethod(class, selector, implementation, typeEncoding);
		ret = true;
	} else
		ret = false;

	objc_global_mutex_unlock();

	return ret;
}

IMP
class_replaceMethod(Class class, SEL selector, IMP implementation,
    const char *typeEncoding)
{
	struct objc_method *method;
	IMP oldImplementation;

	objc_global_mutex_lock();

	if ((method = getMethod(class, selector)) != NULL) {
		oldImplementation = method->implementation;
		method->implementation = implementation;
		objc_update_dtable(class);
	} else {
		oldImplementation = NULL;
		addMethod(class, selector, implementation, typeEncoding);
	}

	objc_global_mutex_unlock();

	return oldImplementation;
}

Class
object_getClass(id object_)
{







|











|











|


|





|













|







|











|




|





|







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

static void
addMethod(Class class, SEL selector, IMP implementation,
    const char *typeEncoding)
{
	struct objc_method_list *methodList;

	/* FIXME: We need a way to free this at objc_deinit() */
	if ((methodList = malloc(sizeof(*methodList))) == NULL)
		OBJC_ERROR("Not enough memory to replace method!");

	methodList->next = class->methodList;
	methodList->count = 1;
	methodList->methods[0].selector.UID = selector->UID;
	methodList->methods[0].selector.typeEncoding = typeEncoding;
	methodList->methods[0].implementation = implementation;

	class->methodList = methodList;

	objc_updateDTable(class);
}

Method
class_getInstanceMethod(Class class, SEL selector)
{
	Method method;
	Class superclass;

	if (class == Nil)
		return NULL;

	objc_globalMutex_lock();

	if ((method = getMethod(class, selector)) != NULL) {
		objc_globalMutex_unlock();
		return method;
	}

	superclass = class->superclass;

	objc_globalMutex_unlock();

	if (superclass != Nil)
		return class_getInstanceMethod(superclass, selector);

	return NULL;
}

bool
class_addMethod(Class class, SEL selector, IMP implementation,
    const char *typeEncoding)
{
	bool ret;

	objc_globalMutex_lock();

	if (getMethod(class, selector) == NULL) {
		addMethod(class, selector, implementation, typeEncoding);
		ret = true;
	} else
		ret = false;

	objc_globalMutex_unlock();

	return ret;
}

IMP
class_replaceMethod(Class class, SEL selector, IMP implementation,
    const char *typeEncoding)
{
	struct objc_method *method;
	IMP oldImplementation;

	objc_globalMutex_lock();

	if ((method = getMethod(class, selector)) != NULL) {
		oldImplementation = method->implementation;
		method->implementation = implementation;
		objc_updateDTable(class);
	} else {
		oldImplementation = NULL;
		addMethod(class, selector, implementation, typeEncoding);
	}

	objc_globalMutex_unlock();

	return oldImplementation;
}

Class
object_getClass(id object_)
{
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
	}

	if (class->subclassList != NULL) {
		free(class->subclassList);
		class->subclassList = NULL;
	}

	if (class->DTable != NULL && class->DTable != emptyDTable)
		objc_dtable_free(class->DTable);

	class->DTable = NULL;

	if ((class->info & OBJC_CLASS_INFO_SETUP) && class->superclass != Nil)
		class->superclass = (Class)class->superclass->name;

	class->info &= ~OBJC_CLASS_INFO_SETUP;
}

void
objc_unregister_class(Class class)
{
	static SEL unloadSel = NULL;

	if (unloadSel == NULL)
		unloadSel = sel_registerName("unload");

	while (class->subclassList != NULL && class->subclassList[0] != Nil)
		objc_unregister_class(class->subclassList[0]);

	if (class->info & OBJC_CLASS_INFO_LOADED)
		callSelector(class, unloadSel);

	objc_hashtable_delete(classes, class->name);

	if (strcmp(class_getName(class), "Protocol") != 0)
		classesCount--;

	unregisterClass(class);
	unregisterClass(class->isa);
}

void
objc_unregister_all_classes(void)
{
	if (classes == NULL)
		return;

	for (uint32_t i = 0; i < classes->size; i++) {
		if (classes->data[i] != NULL &&
		    classes->data[i] != &objc_deleted_bucket) {
			void *class = (Class)classes->data[i]->object;

			if (class == Nil || (uintptr_t)class & 1)
				continue;

			objc_unregister_class(class);

			/*
			 * The table might have been resized, so go back to the
			 * start again.
			 *
			 * Due to the i++ in the for loop, we need to set it to
			 * UINT32_MAX so that it will get increased at the end







|
|

|








|







|














|






|





|







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
	}

	if (class->subclassList != NULL) {
		free(class->subclassList);
		class->subclassList = NULL;
	}

	if (class->dTable != NULL && class->dTable != emptyDTable)
		objc_dtable_free(class->dTable);

	class->dTable = NULL;

	if ((class->info & OBJC_CLASS_INFO_SETUP) && class->superclass != Nil)
		class->superclass = (Class)class->superclass->name;

	class->info &= ~OBJC_CLASS_INFO_SETUP;
}

void
objc_unregisterClass(Class class)
{
	static SEL unloadSel = NULL;

	if (unloadSel == NULL)
		unloadSel = sel_registerName("unload");

	while (class->subclassList != NULL && class->subclassList[0] != Nil)
		objc_unregisterClass(class->subclassList[0]);

	if (class->info & OBJC_CLASS_INFO_LOADED)
		callSelector(class, unloadSel);

	objc_hashtable_delete(classes, class->name);

	if (strcmp(class_getName(class), "Protocol") != 0)
		classesCount--;

	unregisterClass(class);
	unregisterClass(class->isa);
}

void
objc_unregisterAllClasses(void)
{
	if (classes == NULL)
		return;

	for (uint32_t i = 0; i < classes->size; i++) {
		if (classes->data[i] != NULL &&
		    classes->data[i] != &objc_deletedBucket) {
			void *class = (Class)classes->data[i]->object;

			if (class == Nil || (uintptr_t)class & 1)
				continue;

			objc_unregisterClass(class);

			/*
			 * The table might have been resized, so go back to the
			 * start again.
			 *
			 * Due to the i++ in the for loop, we need to set it to
			 * UINT32_MAX so that it will get increased at the end