3 * SGen features specific to Mono.
5 * Copyright (C) 2014 Xamarin Inc
7 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
13 #include "sgen/sgen-gc.h"
14 #include "sgen/sgen-protocol.h"
15 #include "metadata/monitor.h"
16 #include "sgen/sgen-layout-stats.h"
17 #include "sgen/sgen-client.h"
18 #include "sgen/sgen-cardtable.h"
19 #include "sgen/sgen-pinning.h"
20 #include "sgen/sgen-thread-pool.h"
21 #include "metadata/marshal.h"
22 #include "metadata/method-builder.h"
23 #include "metadata/abi-details.h"
24 #include "metadata/mono-gc.h"
25 #include "metadata/runtime.h"
26 #include "metadata/sgen-bridge-internals.h"
27 #include "metadata/gc-internals.h"
28 #include "metadata/handle.h"
29 #include "utils/mono-memory-model.h"
30 #include "utils/mono-logger-internals.h"
31 #include "utils/mono-threads-coop.h"
32 #include "utils/mono-threads.h"
33 #include "metadata/w32handle.h"
35 #ifdef HEAVY_STATISTICS
36 static guint64 stat_wbarrier_set_arrayref = 0;
37 static guint64 stat_wbarrier_value_copy = 0;
38 static guint64 stat_wbarrier_object_copy = 0;
40 static guint64 los_marked_cards;
41 static guint64 los_array_cards;
42 static guint64 los_array_remsets;
45 /* If set, mark stacks conservatively, even if precise marking is possible */
46 static gboolean conservative_stack_mark = FALSE;
47 /* If set, check that there are no references to the domain left at domain unload */
48 gboolean sgen_mono_xdomain_checks = FALSE;
50 /* Functions supplied by the runtime to be called by the GC */
51 static MonoGCCallbacks gc_callbacks;
53 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
55 #define OPDEF(a,b,c,d,e,f,g,h,i,j) \
59 #include "mono/cil/opcode.def"
70 ptr_on_stack (void *ptr)
72 gpointer stack_start = &stack_start;
73 SgenThreadInfo *info = mono_thread_info_current ();
75 if (ptr >= stack_start && ptr < (gpointer)info->client_info.stack_end)
80 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
82 #define HANDLE_PTR(ptr,obj) do { \
83 gpointer o = *(gpointer*)(ptr); \
85 gpointer d = ((char*)dest) + ((char*)(ptr) - (char*)(obj)); \
86 binary_protocol_wbarrier (d, o, (gpointer) SGEN_LOAD_VTABLE (o)); \
91 scan_object_for_binary_protocol_copy_wbarrier (gpointer dest, char *start, mword desc)
93 #define SCAN_OBJECT_NOVTABLE
94 #include "sgen/sgen-scan-object.h"
99 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
101 HEAVY_STAT (++stat_wbarrier_value_copy);
102 g_assert (klass->valuetype);
104 SGEN_LOG (8, "Adding value remset at %p, count %d, descr %p for class %s (%p)", dest, count, (gpointer)klass->gc_descr, klass->name, klass);
106 if (sgen_ptr_in_nursery (dest) || ptr_on_stack (dest) || !sgen_gc_descr_has_references ((mword)klass->gc_descr)) {
107 size_t element_size = mono_class_value_size (klass, NULL);
108 size_t size = count * element_size;
109 mono_gc_memmove_atomic (dest, src, size);
113 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
114 if (binary_protocol_is_heavy_enabled ()) {
115 size_t element_size = mono_class_value_size (klass, NULL);
117 for (i = 0; i < count; ++i) {
118 scan_object_for_binary_protocol_copy_wbarrier ((char*)dest + i * element_size,
119 (char*)src + i * element_size - sizeof (MonoObject),
120 (mword) klass->gc_descr);
125 sgen_get_remset ()->wbarrier_value_copy (dest, src, count, mono_class_value_size (klass, NULL));
129 * mono_gc_wbarrier_object_copy:
131 * Write barrier to call when \p obj is the result of a clone or copy of an object.
134 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
138 HEAVY_STAT (++stat_wbarrier_object_copy);
140 SGEN_ASSERT (6, !ptr_on_stack (obj), "Why is this called for a non-reference type?");
141 if (sgen_ptr_in_nursery (obj) || !SGEN_OBJECT_HAS_REFERENCES (src)) {
142 size = mono_object_class (obj)->instance_size;
143 mono_gc_memmove_aligned ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
144 size - sizeof (MonoObject));
148 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
149 if (binary_protocol_is_heavy_enabled ())
150 scan_object_for_binary_protocol_copy_wbarrier (obj, (char*)src, (mword) src->vtable->gc_descr);
153 sgen_get_remset ()->wbarrier_object_copy (obj, src);
157 * mono_gc_wbarrier_set_arrayref:
160 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
162 HEAVY_STAT (++stat_wbarrier_set_arrayref);
163 if (sgen_ptr_in_nursery (slot_ptr)) {
164 *(void**)slot_ptr = value;
167 SGEN_LOG (8, "Adding remset at %p", slot_ptr);
169 binary_protocol_wbarrier (slot_ptr, value, value->vtable);
171 sgen_get_remset ()->wbarrier_set_field ((GCObject*)arr, slot_ptr, value);
175 * mono_gc_wbarrier_set_field:
178 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
180 mono_gc_wbarrier_set_arrayref ((MonoArray*)obj, field_ptr, value);
184 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
186 sgen_wbarrier_value_copy_bitmap (_dest, _src, size, bitmap);
190 mono_gc_get_suspend_signal (void)
192 return mono_threads_suspend_get_suspend_signal ();
196 mono_gc_get_restart_signal (void)
198 return mono_threads_suspend_get_restart_signal ();
201 static MonoMethod *write_barrier_conc_method;
202 static MonoMethod *write_barrier_noconc_method;
205 sgen_is_critical_method (MonoMethod *method)
207 return sgen_is_managed_allocator (method);
211 sgen_has_critical_method (void)
213 return sgen_has_managed_allocator ();
217 ip_in_critical_region (MonoDomain *domain, gpointer ip)
223 * We pass false for 'try_aot' so this becomes async safe.
224 * It won't find aot methods whose jit info is not yet loaded,
225 * so we preload their jit info in the JIT.
227 ji = mono_jit_info_table_find_internal (domain, ip, FALSE, FALSE);
231 method = mono_jit_info_get_method (ji);
233 return mono_runtime_is_critical_method (method) || sgen_is_critical_method (method);
237 mono_gc_is_critical_method (MonoMethod *method)
239 return sgen_is_critical_method (method);
245 emit_nursery_check (MonoMethodBuilder *mb, int *nursery_check_return_labels, gboolean is_concurrent)
247 int shifted_nursery_start = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
249 memset (nursery_check_return_labels, 0, sizeof (int) * 2);
250 // if (ptr_in_nursery (ptr)) return;
252 * Masking out the bits might be faster, but we would have to use 64 bit
253 * immediates, which might be slower.
255 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
256 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_START);
257 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
258 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
259 mono_mb_emit_byte (mb, CEE_SHR_UN);
260 mono_mb_emit_stloc (mb, shifted_nursery_start);
262 mono_mb_emit_ldarg (mb, 0);
263 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
264 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
265 mono_mb_emit_byte (mb, CEE_SHR_UN);
266 mono_mb_emit_ldloc (mb, shifted_nursery_start);
267 nursery_check_return_labels [0] = mono_mb_emit_branch (mb, CEE_BEQ);
269 if (!is_concurrent) {
270 // if (!ptr_in_nursery (*ptr)) return;
271 mono_mb_emit_ldarg (mb, 0);
272 mono_mb_emit_byte (mb, CEE_LDIND_I);
273 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
274 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
275 mono_mb_emit_byte (mb, CEE_SHR_UN);
276 mono_mb_emit_ldloc (mb, shifted_nursery_start);
277 nursery_check_return_labels [1] = mono_mb_emit_branch (mb, CEE_BNE_UN);
283 mono_gc_get_specific_write_barrier (gboolean is_concurrent)
286 MonoMethodBuilder *mb;
287 MonoMethodSignature *sig;
288 MonoMethod **write_barrier_method_addr;
290 #ifdef MANAGED_WBARRIER
291 int i, nursery_check_labels [2];
294 // FIXME: Maybe create a separate version for ctors (the branch would be
295 // correctly predicted more times)
297 write_barrier_method_addr = &write_barrier_conc_method;
299 write_barrier_method_addr = &write_barrier_noconc_method;
301 if (*write_barrier_method_addr)
302 return *write_barrier_method_addr;
304 /* Create the IL version of mono_gc_barrier_generic_store () */
305 sig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
306 sig->ret = &mono_defaults.void_class->byval_arg;
307 sig->params [0] = &mono_defaults.int_class->byval_arg;
310 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_conc", MONO_WRAPPER_WRITE_BARRIER);
312 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_noconc", MONO_WRAPPER_WRITE_BARRIER);
315 #ifdef MANAGED_WBARRIER
316 emit_nursery_check (mb, nursery_check_labels, is_concurrent);
318 addr = sgen_cardtable + ((address >> CARD_BITS) & CARD_MASK)
322 LDC_PTR sgen_cardtable
328 if (SGEN_HAVE_OVERLAPPING_CARDS) {
329 LDC_PTR card_table_mask
336 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
337 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_CARD_TABLE);
338 mono_mb_emit_ldarg (mb, 0);
339 mono_mb_emit_icon (mb, CARD_BITS);
340 mono_mb_emit_byte (mb, CEE_SHR_UN);
341 mono_mb_emit_byte (mb, CEE_CONV_I);
342 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
343 #if SIZEOF_VOID_P == 8
344 mono_mb_emit_icon8 (mb, CARD_MASK);
346 mono_mb_emit_icon (mb, CARD_MASK);
348 mono_mb_emit_byte (mb, CEE_CONV_I);
349 mono_mb_emit_byte (mb, CEE_AND);
351 mono_mb_emit_byte (mb, CEE_ADD);
352 mono_mb_emit_icon (mb, 1);
353 mono_mb_emit_byte (mb, CEE_STIND_I1);
356 for (i = 0; i < 2; ++i) {
357 if (nursery_check_labels [i])
358 mono_mb_patch_branch (mb, nursery_check_labels [i]);
360 mono_mb_emit_byte (mb, CEE_RET);
362 mono_mb_emit_ldarg (mb, 0);
363 mono_mb_emit_icall (mb, mono_gc_wbarrier_generic_nostore);
364 mono_mb_emit_byte (mb, CEE_RET);
367 res = mono_mb_create_method (mb, sig, 16);
368 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
369 mono_marshal_set_wrapper_info (res, info);
373 if (*write_barrier_method_addr) {
374 /* Already created */
375 mono_free_method (res);
377 /* double-checked locking */
378 mono_memory_barrier ();
379 *write_barrier_method_addr = res;
383 return *write_barrier_method_addr;
387 mono_gc_get_write_barrier (void)
389 return mono_gc_get_specific_write_barrier (major_collector.is_concurrent);
393 * Dummy filler objects
396 /* Vtable of the objects used to fill out nursery fragments before a collection */
397 static GCVTable array_fill_vtable;
400 get_array_fill_vtable (void)
402 if (!array_fill_vtable) {
403 static MonoClass klass;
404 static char _vtable[sizeof(MonoVTable)+8];
405 MonoVTable* vtable = (MonoVTable*) ALIGN_TO((mword)_vtable, 8);
408 MonoDomain *domain = mono_get_root_domain ();
411 klass.element_class = mono_defaults.byte_class;
413 klass.instance_size = MONO_SIZEOF_MONO_ARRAY;
414 klass.sizes.element_size = 1;
415 klass.name = "array_filler_type";
417 vtable->klass = &klass;
419 vtable->gc_descr = mono_gc_make_descr_for_array (TRUE, &bmap, 0, 1);
422 array_fill_vtable = vtable;
424 return array_fill_vtable;
428 sgen_client_array_fill_range (char *start, size_t size)
432 if (size < MONO_SIZEOF_MONO_ARRAY) {
433 memset (start, 0, size);
437 o = (MonoArray*)start;
438 o->obj.vtable = (MonoVTable*)get_array_fill_vtable ();
439 /* Mark this as not a real object */
440 o->obj.synchronisation = (MonoThreadsSync *)GINT_TO_POINTER (-1);
442 o->max_length = (mono_array_size_t)(size - MONO_SIZEOF_MONO_ARRAY);
448 sgen_client_zero_array_fill_header (void *p, size_t size)
450 if (size >= MONO_SIZEOF_MONO_ARRAY) {
451 memset (p, 0, MONO_SIZEOF_MONO_ARRAY);
453 static guint8 zeros [MONO_SIZEOF_MONO_ARRAY];
455 SGEN_ASSERT (0, !memcmp (p, zeros, size), "TLAB segment must be zeroed out.");
463 static MonoGCFinalizerCallbacks fin_callbacks;
466 mono_gc_get_vtable_bits (MonoClass *klass)
469 /* FIXME move this to the bridge code */
470 if (sgen_need_bridge_processing ()) {
471 switch (sgen_bridge_class_kind (klass)) {
472 case GC_BRIDGE_TRANSPARENT_BRIDGE_CLASS:
473 case GC_BRIDGE_OPAQUE_BRIDGE_CLASS:
474 res = SGEN_GC_BIT_BRIDGE_OBJECT;
476 case GC_BRIDGE_OPAQUE_CLASS:
477 res = SGEN_GC_BIT_BRIDGE_OPAQUE_OBJECT;
479 case GC_BRIDGE_TRANSPARENT_CLASS:
483 if (fin_callbacks.is_class_finalization_aware) {
484 if (fin_callbacks.is_class_finalization_aware (klass))
485 res |= SGEN_GC_BIT_FINALIZER_AWARE;
491 is_finalization_aware (MonoObject *obj)
493 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
494 return (vt->gc_bits & SGEN_GC_BIT_FINALIZER_AWARE) == SGEN_GC_BIT_FINALIZER_AWARE;
498 sgen_client_object_queued_for_finalization (GCObject *obj)
500 if (fin_callbacks.object_queued_for_finalization && is_finalization_aware (obj))
501 fin_callbacks.object_queued_for_finalization (obj);
504 if (G_UNLIKELY (MONO_GC_FINALIZE_ENQUEUE_ENABLED ())) {
505 int gen = sgen_ptr_in_nursery (obj) ? GENERATION_NURSERY : GENERATION_OLD;
506 GCVTable vt = SGEN_LOAD_VTABLE (obj);
507 MONO_GC_FINALIZE_ENQUEUE ((mword)obj, sgen_safe_object_get_size (obj),
508 sgen_client_vtable_get_namespace (vt), sgen_client_vtable_get_name (vt), gen,
509 sgen_client_object_has_critical_finalizer (obj));
515 mono_gc_register_finalizer_callbacks (MonoGCFinalizerCallbacks *callbacks)
517 if (callbacks->version != MONO_GC_FINALIZER_EXTENSION_VERSION)
518 g_error ("Invalid finalizer callback version. Expected %d but got %d\n", MONO_GC_FINALIZER_EXTENSION_VERSION, callbacks->version);
520 fin_callbacks = *callbacks;
524 sgen_client_run_finalize (MonoObject *obj)
526 mono_gc_run_finalize (obj, NULL);
530 mono_gc_invoke_finalizers (void)
532 return sgen_gc_invoke_finalizers ();
536 mono_gc_pending_finalizers (void)
538 return sgen_have_pending_finalizers ();
542 sgen_client_finalize_notify (void)
544 mono_gc_finalize_notify ();
548 mono_gc_register_for_finalization (MonoObject *obj, void *user_data)
550 sgen_object_register_for_finalization (obj, user_data);
554 object_in_domain_predicate (MonoObject *obj, void *user_data)
556 MonoDomain *domain = (MonoDomain *)user_data;
557 if (mono_object_domain (obj) == domain) {
558 SGEN_LOG (5, "Unregistering finalizer for object: %p (%s)", obj, sgen_client_vtable_get_name (SGEN_LOAD_VTABLE (obj)));
565 * mono_gc_finalizers_for_domain:
566 * \param domain the unloading appdomain
567 * \param out_array output array
568 * \param out_size size of output array
569 * Enqueue for finalization all objects that belong to the unloading appdomain \p domain.
570 * \p suspend is used for early termination of the enqueuing process.
573 mono_gc_finalize_domain (MonoDomain *domain)
575 sgen_finalize_if (object_in_domain_predicate, domain);
579 mono_gc_suspend_finalizers (void)
581 sgen_set_suspend_finalizers ();
588 typedef struct _EphemeronLinkNode EphemeronLinkNode;
590 struct _EphemeronLinkNode {
591 EphemeronLinkNode *next;
600 static EphemeronLinkNode *ephemeron_list;
602 /* LOCKING: requires that the GC lock is held */
604 null_ephemerons_for_domain (MonoDomain *domain)
606 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
609 MonoObject *object = (MonoObject*)current->array;
612 SGEN_ASSERT (0, object->vtable, "Can't have objects without vtables.");
614 if (object && object->vtable->domain == domain) {
615 EphemeronLinkNode *tmp = current;
618 prev->next = current->next;
620 ephemeron_list = current->next;
622 current = current->next;
623 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
626 current = current->next;
631 /* LOCKING: requires that the GC lock is held */
633 sgen_client_clear_unreachable_ephemerons (ScanCopyContext ctx)
635 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
636 SgenGrayQueue *queue = ctx.queue;
637 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
638 Ephemeron *cur, *array_end;
642 MonoArray *array = current->array;
644 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
645 EphemeronLinkNode *tmp = current;
647 SGEN_LOG (5, "Dead Ephemeron array at %p", array);
650 prev->next = current->next;
652 ephemeron_list = current->next;
654 current = current->next;
655 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
660 copy_func ((GCObject**)&array, queue);
661 current->array = array;
663 SGEN_LOG (5, "Clearing unreachable entries for ephemeron array at %p", array);
665 cur = mono_array_addr (array, Ephemeron, 0);
666 array_end = cur + mono_array_length_fast (array);
667 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
669 for (; cur < array_end; ++cur) {
670 GCObject *key = cur->key;
672 if (!key || key == tombstone)
675 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
676 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
677 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
679 if (!sgen_is_object_alive_for_current_gen (key)) {
680 cur->key = tombstone;
686 current = current->next;
691 LOCKING: requires that the GC lock is held
693 Limitations: We scan all ephemerons on every collection since the current design doesn't allow for a simple nursery/mature split.
696 sgen_client_mark_ephemerons (ScanCopyContext ctx)
698 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
699 SgenGrayQueue *queue = ctx.queue;
700 gboolean nothing_marked = TRUE;
701 EphemeronLinkNode *current = ephemeron_list;
702 Ephemeron *cur, *array_end;
705 for (current = ephemeron_list; current; current = current->next) {
706 MonoArray *array = current->array;
707 SGEN_LOG (5, "Ephemeron array at %p", array);
709 /*It has to be alive*/
710 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
711 SGEN_LOG (5, "\tnot reachable");
715 copy_func ((GCObject**)&array, queue);
717 cur = mono_array_addr (array, Ephemeron, 0);
718 array_end = cur + mono_array_length_fast (array);
719 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
721 for (; cur < array_end; ++cur) {
722 GCObject *key = cur->key;
724 if (!key || key == tombstone)
727 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
728 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
729 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
731 if (sgen_is_object_alive_for_current_gen (key)) {
732 GCObject *value = cur->value;
734 copy_func (&cur->key, queue);
736 if (!sgen_is_object_alive_for_current_gen (value))
737 nothing_marked = FALSE;
738 copy_func (&cur->value, queue);
744 SGEN_LOG (5, "Ephemeron run finished. Is it done %d", nothing_marked);
745 return nothing_marked;
749 mono_gc_ephemeron_array_add (MonoObject *obj)
751 EphemeronLinkNode *node;
755 node = (EphemeronLinkNode *)sgen_alloc_internal (INTERNAL_MEM_EPHEMERON_LINK);
760 node->array = (MonoArray*)obj;
761 node->next = ephemeron_list;
762 ephemeron_list = node;
764 SGEN_LOG (5, "Registered ephemeron array %p", obj);
775 need_remove_object_for_domain (GCObject *start, MonoDomain *domain)
777 if (mono_object_domain (start) == domain) {
778 SGEN_LOG (4, "Need to cleanup object %p", start);
779 binary_protocol_cleanup (start, (gpointer)SGEN_LOAD_VTABLE (start), sgen_safe_object_get_size ((GCObject*)start));
786 process_object_for_domain_clearing (GCObject *start, MonoDomain *domain)
788 MonoVTable *vt = SGEN_LOAD_VTABLE (start);
789 if (vt->klass == mono_defaults.internal_thread_class)
790 g_assert (mono_object_domain (start) == mono_get_root_domain ());
791 /* The object could be a proxy for an object in the domain
793 #ifndef DISABLE_REMOTING
794 if (mono_defaults.real_proxy_class->supertypes && mono_class_has_parent_fast (vt->klass, mono_defaults.real_proxy_class)) {
795 MonoObject *server = ((MonoRealProxy*)start)->unwrapped_server;
797 /* The server could already have been zeroed out, so
798 we need to check for that, too. */
799 if (server && (!SGEN_LOAD_VTABLE (server) || mono_object_domain (server) == domain)) {
800 SGEN_LOG (4, "Cleaning up remote pointer in %p to object %p", start, server);
801 ((MonoRealProxy*)start)->unwrapped_server = NULL;
808 clear_domain_process_object (GCObject *obj, MonoDomain *domain)
812 process_object_for_domain_clearing (obj, domain);
813 remove = need_remove_object_for_domain (obj, domain);
815 if (remove && obj->synchronisation) {
816 guint32 dislink = mono_monitor_get_object_monitor_gchandle (obj);
818 mono_gchandle_free (dislink);
825 clear_domain_process_minor_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
827 if (clear_domain_process_object (obj, domain)) {
828 CANARIFY_SIZE (size);
829 memset (obj, 0, size);
834 clear_domain_process_major_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
836 clear_domain_process_object (obj, domain);
840 clear_domain_free_major_non_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
842 if (need_remove_object_for_domain (obj, domain))
843 major_collector.free_non_pinned_object (obj, size);
847 clear_domain_free_major_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
849 if (need_remove_object_for_domain (obj, domain))
850 major_collector.free_pinned_object (obj, size);
854 * When appdomains are unloaded we can easily remove objects that have finalizers,
855 * but all the others could still be present in random places on the heap.
856 * We need a sweep to get rid of them even though it's going to be costly
858 * The reason we need to remove them is because we access the vtable and class
859 * structures to know the object size and the reference bitmap: once the domain is
860 * unloaded the point to random memory.
863 mono_gc_clear_domain (MonoDomain * domain)
865 LOSObject *bigobj, *prev;
870 binary_protocol_domain_unload_begin (domain);
874 if (sgen_concurrent_collection_in_progress ())
875 sgen_perform_collection (0, GENERATION_OLD, "clear domain", TRUE, FALSE);
876 SGEN_ASSERT (0, !sgen_concurrent_collection_in_progress (), "We just ordered a synchronous collection. Why are we collecting concurrently?");
878 major_collector.finish_sweeping ();
880 sgen_process_fin_stage_entries ();
882 sgen_clear_nursery_fragments ();
884 if (sgen_mono_xdomain_checks && domain != mono_get_root_domain ()) {
885 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_NORMAL);
886 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_WBARRIER);
887 sgen_check_for_xdomain_refs ();
890 /*Ephemerons and dislinks must be processed before LOS since they might end up pointing
891 to memory returned to the OS.*/
892 null_ephemerons_for_domain (domain);
893 sgen_null_links_for_domain (domain);
895 for (i = GENERATION_NURSERY; i < GENERATION_MAX; ++i)
896 sgen_remove_finalizers_if (object_in_domain_predicate, domain, i);
898 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
899 (IterateObjectCallbackFunc)clear_domain_process_minor_object_callback, domain, FALSE, TRUE);
901 /* We need two passes over major and large objects because
902 freeing such objects might give their memory back to the OS
903 (in the case of large objects) or obliterate its vtable
904 (pinned objects with major-copying or pinned and non-pinned
905 objects with major-mark&sweep), but we might need to
906 dereference a pointer from an object to another object if
907 the first object is a proxy. */
908 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, (IterateObjectCallbackFunc)clear_domain_process_major_object_callback, domain);
909 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
910 clear_domain_process_object ((GCObject*)bigobj->data, domain);
913 for (bigobj = los_object_list; bigobj;) {
914 if (need_remove_object_for_domain ((GCObject*)bigobj->data, domain)) {
915 LOSObject *to_free = bigobj;
917 prev->next = bigobj->next;
919 los_object_list = bigobj->next;
920 bigobj = bigobj->next;
921 SGEN_LOG (4, "Freeing large object %p", bigobj->data);
922 sgen_los_free_object (to_free);
926 bigobj = bigobj->next;
928 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_NON_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_non_pinned_object_callback, domain);
929 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_pinned_object_callback, domain);
931 if (domain == mono_get_root_domain ()) {
932 sgen_pin_stats_report ();
933 sgen_object_layout_dump (stdout);
936 sgen_restart_world (0);
938 binary_protocol_domain_unload_end (domain);
939 binary_protocol_flush_buffers (FALSE);
949 mono_gc_alloc_obj (MonoVTable *vtable, size_t size)
951 MonoObject *obj = sgen_alloc_obj (vtable, size);
953 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
955 mono_profiler_allocation (obj);
962 mono_gc_alloc_pinned_obj (MonoVTable *vtable, size_t size)
964 MonoObject *obj = sgen_alloc_obj_pinned (vtable, size);
966 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
968 mono_profiler_allocation (obj);
975 mono_gc_alloc_mature (MonoVTable *vtable, size_t size)
977 MonoObject *obj = sgen_alloc_obj_mature (vtable, size);
979 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
981 mono_profiler_allocation (obj);
988 mono_gc_alloc_fixed (size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
990 /* FIXME: do a single allocation */
991 void *res = g_calloc (1, size);
994 if (!mono_gc_register_root ((char *)res, size, descr, source, msg)) {
1002 mono_gc_free_fixed (void* addr)
1004 mono_gc_deregister_root ((char *)addr);
1012 static MonoMethod* alloc_method_cache [ATYPE_NUM];
1013 static MonoMethod* slowpath_alloc_method_cache [ATYPE_NUM];
1014 static gboolean use_managed_allocator = TRUE;
1016 #ifdef MANAGED_ALLOCATION
1017 // Cache the SgenThreadInfo pointer in a local 'var'.
1018 #define EMIT_TLS_ACCESS_VAR(mb, var) \
1020 var = mono_mb_add_local ((mb), &mono_defaults.int_class->byval_arg); \
1021 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1022 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1023 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1024 mono_mb_emit_stloc ((mb), (var)); \
1027 #define EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR(mb, var) \
1029 mono_mb_emit_ldloc ((mb), (var)); \
1030 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenClientThreadInfo, in_critical_region)); \
1031 mono_mb_emit_byte ((mb), CEE_ADD); \
1034 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb, var) do { \
1035 mono_mb_emit_ldloc ((mb), (var)); \
1036 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_next)); \
1037 mono_mb_emit_byte ((mb), CEE_ADD); \
1040 #define EMIT_TLS_ACCESS_TEMP_END(mb, var) do { \
1041 mono_mb_emit_ldloc ((mb), (var)); \
1042 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_temp_end)); \
1043 mono_mb_emit_byte ((mb), CEE_ADD); \
1044 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1047 /* FIXME: Do this in the JIT, where specialized allocation sequences can be created
1048 * for each class. This is currently not easy to do, as it is hard to generate basic
1049 * blocks + branches, but it is easy with the linear IL codebase.
1051 * For this to work we'd need to solve the TLAB race, first. Now we
1052 * require the allocator to be in a few known methods to make sure
1053 * that they are executed atomically via the restart mechanism.
1056 create_allocator (int atype, ManagedAllocatorVariant variant)
1058 int p_var, size_var, real_size_var, thread_var G_GNUC_UNUSED;
1059 gboolean slowpath = variant == MANAGED_ALLOCATOR_SLOW_PATH;
1060 guint32 fastpath_branch, max_size_branch, no_oom_branch;
1061 MonoMethodBuilder *mb;
1063 MonoMethodSignature *csig;
1064 static gboolean registered = FALSE;
1065 int tlab_next_addr_var, new_next_var;
1066 const char *name = NULL;
1071 mono_register_jit_icall (mono_gc_alloc_obj, "mono_gc_alloc_obj", mono_create_icall_signature ("object ptr int"), FALSE);
1072 mono_register_jit_icall (mono_gc_alloc_vector, "mono_gc_alloc_vector", mono_create_icall_signature ("object ptr int int"), FALSE);
1073 mono_register_jit_icall (mono_gc_alloc_string, "mono_gc_alloc_string", mono_create_icall_signature ("object ptr int int32"), FALSE);
1077 if (atype == ATYPE_SMALL) {
1078 name = slowpath ? "SlowAllocSmall" : "AllocSmall";
1079 } else if (atype == ATYPE_NORMAL) {
1080 name = slowpath ? "SlowAlloc" : "Alloc";
1081 } else if (atype == ATYPE_VECTOR) {
1082 name = slowpath ? "SlowAllocVector" : "AllocVector";
1083 } else if (atype == ATYPE_STRING) {
1084 name = slowpath ? "SlowAllocString" : "AllocString";
1086 g_assert_not_reached ();
1089 if (atype == ATYPE_NORMAL)
1094 csig = mono_metadata_signature_alloc (mono_defaults.corlib, num_params);
1095 if (atype == ATYPE_STRING) {
1096 csig->ret = &mono_defaults.string_class->byval_arg;
1097 csig->params [0] = &mono_defaults.int_class->byval_arg;
1098 csig->params [1] = &mono_defaults.int32_class->byval_arg;
1100 csig->ret = &mono_defaults.object_class->byval_arg;
1101 for (i = 0; i < num_params; i++)
1102 csig->params [i] = &mono_defaults.int_class->byval_arg;
1105 mb = mono_mb_new (mono_defaults.object_class, name, MONO_WRAPPER_ALLOC);
1112 mono_mb_emit_ldarg (mb, 0);
1113 mono_mb_emit_icall (mb, ves_icall_object_new_specific);
1116 mono_mb_emit_ldarg (mb, 0);
1117 mono_mb_emit_ldarg (mb, 1);
1118 mono_mb_emit_icall (mb, ves_icall_array_new_specific);
1121 mono_mb_emit_ldarg (mb, 1);
1122 mono_mb_emit_icall (mb, ves_icall_string_alloc);
1125 g_assert_not_reached ();
1132 * Tls access might call foreign code or code without jinfo. This can
1133 * only happen if we are outside of the critical region.
1135 EMIT_TLS_ACCESS_VAR (mb, thread_var);
1137 size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1138 if (atype == ATYPE_SMALL) {
1139 /* size_var = size_arg */
1140 mono_mb_emit_ldarg (mb, 1);
1141 mono_mb_emit_stloc (mb, size_var);
1142 } else if (atype == ATYPE_NORMAL) {
1143 /* size = vtable->klass->instance_size; */
1144 mono_mb_emit_ldarg (mb, 0);
1145 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1146 mono_mb_emit_byte (mb, CEE_ADD);
1147 mono_mb_emit_byte (mb, CEE_LDIND_I);
1148 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, instance_size));
1149 mono_mb_emit_byte (mb, CEE_ADD);
1150 /* FIXME: assert instance_size stays a 4 byte integer */
1151 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1152 mono_mb_emit_byte (mb, CEE_CONV_I);
1153 mono_mb_emit_stloc (mb, size_var);
1154 } else if (atype == ATYPE_VECTOR) {
1155 MonoExceptionClause *clause;
1156 int pos, pos_leave, pos_error;
1157 MonoClass *oom_exc_class;
1161 * n > MONO_ARRAY_MAX_INDEX => OutOfMemoryException
1162 * n < 0 => OverflowException
1164 * We can do an unsigned comparison to catch both cases, then in the error
1165 * case compare signed to distinguish between them.
1167 mono_mb_emit_ldarg (mb, 1);
1168 mono_mb_emit_icon (mb, MONO_ARRAY_MAX_INDEX);
1169 mono_mb_emit_byte (mb, CEE_CONV_U);
1170 pos = mono_mb_emit_short_branch (mb, CEE_BLE_UN_S);
1172 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1173 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1174 mono_mb_emit_ldarg (mb, 1);
1175 mono_mb_emit_icon (mb, 0);
1176 pos_error = mono_mb_emit_short_branch (mb, CEE_BLT_S);
1177 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1178 mono_mb_patch_short_branch (mb, pos_error);
1179 mono_mb_emit_exception (mb, "OverflowException", NULL);
1181 mono_mb_patch_short_branch (mb, pos);
1183 clause = (MonoExceptionClause *)mono_image_alloc0 (mono_defaults.corlib, sizeof (MonoExceptionClause));
1184 clause->try_offset = mono_mb_get_label (mb);
1186 /* vtable->klass->sizes.element_size */
1187 mono_mb_emit_ldarg (mb, 0);
1188 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1189 mono_mb_emit_byte (mb, CEE_ADD);
1190 mono_mb_emit_byte (mb, CEE_LDIND_I);
1191 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, sizes));
1192 mono_mb_emit_byte (mb, CEE_ADD);
1193 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1194 mono_mb_emit_byte (mb, CEE_CONV_I);
1197 mono_mb_emit_ldarg (mb, 1);
1198 mono_mb_emit_byte (mb, CEE_MUL_OVF_UN);
1199 /* + sizeof (MonoArray) */
1200 mono_mb_emit_icon (mb, MONO_SIZEOF_MONO_ARRAY);
1201 mono_mb_emit_byte (mb, CEE_ADD_OVF_UN);
1202 mono_mb_emit_stloc (mb, size_var);
1204 pos_leave = mono_mb_emit_branch (mb, CEE_LEAVE);
1207 clause->flags = MONO_EXCEPTION_CLAUSE_NONE;
1208 clause->try_len = mono_mb_get_pos (mb) - clause->try_offset;
1209 clause->data.catch_class = mono_class_load_from_name (mono_defaults.corlib,
1210 "System", "OverflowException");
1211 clause->handler_offset = mono_mb_get_label (mb);
1213 oom_exc_class = mono_class_load_from_name (mono_defaults.corlib,
1214 "System", "OutOfMemoryException");
1215 ctor = mono_class_get_method_from_name (oom_exc_class, ".ctor", 0);
1218 mono_mb_emit_byte (mb, CEE_POP);
1219 mono_mb_emit_op (mb, CEE_NEWOBJ, ctor);
1220 mono_mb_emit_byte (mb, CEE_THROW);
1222 clause->handler_len = mono_mb_get_pos (mb) - clause->handler_offset;
1223 mono_mb_set_clauses (mb, 1, clause);
1224 mono_mb_patch_branch (mb, pos_leave);
1226 } else if (atype == ATYPE_STRING) {
1230 * a string allocator method takes the args: (vtable, len)
1232 * bytes = offsetof (MonoString, chars) + ((len + 1) * 2)
1236 * bytes <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1240 * offsetof (MonoString, chars) + ((len + 1) * 2) <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1241 * len <= (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - offsetof (MonoString, chars)) / 2 - 1
1243 mono_mb_emit_ldarg (mb, 1);
1244 mono_mb_emit_icon (mb, (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - MONO_STRUCT_OFFSET (MonoString, chars)) / 2 - 1);
1245 pos = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
1247 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1248 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1249 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1250 mono_mb_patch_short_branch (mb, pos);
1252 mono_mb_emit_ldarg (mb, 1);
1253 mono_mb_emit_icon (mb, 1);
1254 mono_mb_emit_byte (mb, MONO_CEE_SHL);
1255 //WE manually fold the above + 2 here
1256 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, chars) + 2);
1257 mono_mb_emit_byte (mb, CEE_ADD);
1258 mono_mb_emit_stloc (mb, size_var);
1260 g_assert_not_reached ();
1263 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1264 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1265 mono_mb_emit_byte (mb, CEE_LDC_I4_1);
1266 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1267 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1268 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_NONE);
1271 if (nursery_canaries_enabled ()) {
1272 real_size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1273 mono_mb_emit_ldloc (mb, size_var);
1274 mono_mb_emit_stloc(mb, real_size_var);
1277 real_size_var = size_var;
1279 /* size += ALLOC_ALIGN - 1; */
1280 mono_mb_emit_ldloc (mb, size_var);
1281 mono_mb_emit_icon (mb, SGEN_ALLOC_ALIGN - 1);
1282 mono_mb_emit_byte (mb, CEE_ADD);
1283 /* size &= ~(ALLOC_ALIGN - 1); */
1284 mono_mb_emit_icon (mb, ~(SGEN_ALLOC_ALIGN - 1));
1285 mono_mb_emit_byte (mb, CEE_AND);
1286 mono_mb_emit_stloc (mb, size_var);
1288 /* if (size > MAX_SMALL_OBJ_SIZE) goto slowpath */
1289 if (atype != ATYPE_SMALL) {
1290 mono_mb_emit_ldloc (mb, size_var);
1291 mono_mb_emit_icon (mb, SGEN_MAX_SMALL_OBJ_SIZE);
1292 max_size_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
1296 * We need to modify tlab_next, but the JIT only supports reading, so we read
1297 * another tls var holding its address instead.
1300 /* tlab_next_addr (local) = tlab_next_addr (TLS var) */
1301 tlab_next_addr_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1302 EMIT_TLS_ACCESS_NEXT_ADDR (mb, thread_var);
1303 mono_mb_emit_stloc (mb, tlab_next_addr_var);
1305 /* p = (void**)tlab_next; */
1306 p_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1307 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1308 mono_mb_emit_byte (mb, CEE_LDIND_I);
1309 mono_mb_emit_stloc (mb, p_var);
1311 /* new_next = (char*)p + size; */
1312 new_next_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1313 mono_mb_emit_ldloc (mb, p_var);
1314 mono_mb_emit_ldloc (mb, size_var);
1315 mono_mb_emit_byte (mb, CEE_CONV_I);
1316 mono_mb_emit_byte (mb, CEE_ADD);
1318 if (nursery_canaries_enabled ()) {
1319 mono_mb_emit_icon (mb, CANARY_SIZE);
1320 mono_mb_emit_byte (mb, CEE_ADD);
1322 mono_mb_emit_stloc (mb, new_next_var);
1324 /* if (G_LIKELY (new_next < tlab_temp_end)) */
1325 mono_mb_emit_ldloc (mb, new_next_var);
1326 EMIT_TLS_ACCESS_TEMP_END (mb, thread_var);
1327 fastpath_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
1330 if (atype != ATYPE_SMALL)
1331 mono_mb_patch_short_branch (mb, max_size_branch);
1333 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1334 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1336 * We are no longer in a critical section. We need to do this before calling
1337 * to unmanaged land in order to avoid stw deadlocks since unmanaged code
1340 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1341 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1342 mono_mb_emit_byte (mb, CEE_LDC_I4_0);
1343 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1344 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1345 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_NONE);
1348 /* FIXME: mono_gc_alloc_obj takes a 'size_t' as an argument, not an int32 */
1349 mono_mb_emit_ldarg (mb, 0);
1350 mono_mb_emit_ldloc (mb, real_size_var);
1351 if (atype == ATYPE_NORMAL || atype == ATYPE_SMALL) {
1352 mono_mb_emit_icall (mb, mono_gc_alloc_obj);
1353 } else if (atype == ATYPE_VECTOR) {
1354 mono_mb_emit_ldarg (mb, 1);
1355 mono_mb_emit_icall (mb, mono_gc_alloc_vector);
1356 } else if (atype == ATYPE_STRING) {
1357 mono_mb_emit_ldarg (mb, 1);
1358 mono_mb_emit_icall (mb, mono_gc_alloc_string);
1360 g_assert_not_reached ();
1363 /* if (ret == NULL) throw OOM; */
1364 mono_mb_emit_byte (mb, CEE_DUP);
1365 no_oom_branch = mono_mb_emit_branch (mb, CEE_BRTRUE);
1366 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1368 mono_mb_patch_branch (mb, no_oom_branch);
1369 mono_mb_emit_byte (mb, CEE_RET);
1372 mono_mb_patch_short_branch (mb, fastpath_branch);
1374 /* FIXME: Memory barrier */
1376 /* tlab_next = new_next */
1377 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1378 mono_mb_emit_ldloc (mb, new_next_var);
1379 mono_mb_emit_byte (mb, CEE_STIND_I);
1382 mono_mb_emit_ldloc (mb, p_var);
1383 mono_mb_emit_ldarg (mb, 0);
1384 mono_mb_emit_byte (mb, CEE_STIND_I);
1386 /* mark object end with nursery word */
1387 if (nursery_canaries_enabled ()) {
1388 mono_mb_emit_ldloc (mb, p_var);
1389 mono_mb_emit_ldloc (mb, real_size_var);
1390 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1391 mono_mb_emit_icon8 (mb, (mword) CANARY_STRING);
1392 mono_mb_emit_icon (mb, CANARY_SIZE);
1393 mono_mb_emit_byte (mb, MONO_CEE_PREFIX1);
1394 mono_mb_emit_byte (mb, CEE_CPBLK);
1397 if (atype == ATYPE_VECTOR) {
1398 /* arr->max_length = max_length; */
1399 mono_mb_emit_ldloc (mb, p_var);
1400 mono_mb_emit_ldflda (mb, MONO_STRUCT_OFFSET (MonoArray, max_length));
1401 mono_mb_emit_ldarg (mb, 1);
1402 #ifdef MONO_BIG_ARRAYS
1403 mono_mb_emit_byte (mb, CEE_STIND_I);
1405 mono_mb_emit_byte (mb, CEE_STIND_I4);
1407 } else if (atype == ATYPE_STRING) {
1408 /* need to set length and clear the last char */
1409 /* s->length = len; */
1410 mono_mb_emit_ldloc (mb, p_var);
1411 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, length));
1412 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1413 mono_mb_emit_ldarg (mb, 1);
1414 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
1417 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1418 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1419 mono_mb_emit_byte (mb, CEE_LDC_I4_0);
1420 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1421 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1423 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1424 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1427 We must make sure both vtable and max_length are globaly visible before returning to managed land.
1429 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1432 mono_mb_emit_ldloc (mb, p_var);
1435 mono_mb_emit_byte (mb, CEE_RET);
1438 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
1439 info->d.alloc.gc_name = "sgen";
1440 info->d.alloc.alloc_type = atype;
1443 mb->init_locals = FALSE;
1446 res = mono_mb_create (mb, csig, 8, info);
1455 mono_gc_get_aligned_size_for_allocator (int size)
1457 return SGEN_ALIGN_UP (size);
1461 * Generate an allocator method implementing the fast path of mono_gc_alloc_obj ().
1462 * The signature of the called method is:
1463 * object allocate (MonoVTable *vtable)
1466 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box, gboolean known_instance_size)
1468 #ifdef MANAGED_ALLOCATION
1469 if (collect_before_allocs)
1471 if (klass->instance_size > tlab_size)
1473 if (known_instance_size && ALIGN_TO (klass->instance_size, SGEN_ALLOC_ALIGN) >= SGEN_MAX_SMALL_OBJ_SIZE)
1475 if (mono_class_has_finalizer (klass) || mono_class_is_marshalbyref (klass))
1479 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1481 if (klass->byval_arg.type == MONO_TYPE_STRING)
1482 return mono_gc_get_managed_allocator_by_type (ATYPE_STRING, MANAGED_ALLOCATOR_REGULAR);
1483 /* Generic classes have dynamic field and can go above MAX_SMALL_OBJ_SIZE. */
1484 if (known_instance_size)
1485 return mono_gc_get_managed_allocator_by_type (ATYPE_SMALL, MANAGED_ALLOCATOR_REGULAR);
1487 return mono_gc_get_managed_allocator_by_type (ATYPE_NORMAL, MANAGED_ALLOCATOR_REGULAR);
1494 mono_gc_get_managed_array_allocator (MonoClass *klass)
1496 #ifdef MANAGED_ALLOCATION
1497 if (klass->rank != 1)
1499 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1501 if (has_per_allocation_action)
1503 g_assert (!mono_class_has_finalizer (klass) && !mono_class_is_marshalbyref (klass));
1505 return mono_gc_get_managed_allocator_by_type (ATYPE_VECTOR, MANAGED_ALLOCATOR_REGULAR);
1512 sgen_set_use_managed_allocator (gboolean flag)
1514 use_managed_allocator = flag;
1518 mono_gc_get_managed_allocator_by_type (int atype, ManagedAllocatorVariant variant)
1520 #ifdef MANAGED_ALLOCATION
1524 if (variant == MANAGED_ALLOCATOR_REGULAR && !use_managed_allocator)
1528 case MANAGED_ALLOCATOR_REGULAR: cache = alloc_method_cache; break;
1529 case MANAGED_ALLOCATOR_SLOW_PATH: cache = slowpath_alloc_method_cache; break;
1530 default: g_assert_not_reached (); break;
1533 res = cache [atype];
1537 res = create_allocator (atype, variant);
1539 if (cache [atype]) {
1540 mono_free_method (res);
1541 res = cache [atype];
1543 mono_memory_barrier ();
1544 cache [atype] = res;
1555 mono_gc_get_managed_allocator_types (void)
1561 sgen_is_managed_allocator (MonoMethod *method)
1565 for (i = 0; i < ATYPE_NUM; ++i)
1566 if (method == alloc_method_cache [i] || method == slowpath_alloc_method_cache [i])
1572 sgen_has_managed_allocator (void)
1576 for (i = 0; i < ATYPE_NUM; ++i)
1577 if (alloc_method_cache [i] || slowpath_alloc_method_cache [i])
1582 #define ARRAY_OBJ_INDEX(ptr,array,elem_size) (((char*)(ptr) - ((char*)(array) + G_STRUCT_OFFSET (MonoArray, vector))) / (elem_size))
1585 sgen_client_cardtable_scan_object (GCObject *obj, guint8 *cards, ScanCopyContext ctx)
1587 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
1588 MonoClass *klass = vt->klass;
1590 SGEN_ASSERT (0, SGEN_VTABLE_HAS_REFERENCES (vt), "Why would we ever call this on reference-free objects?");
1593 MonoArray *arr = (MonoArray*)obj;
1594 guint8 *card_data, *card_base;
1595 guint8 *card_data_end;
1596 char *obj_start = (char *)sgen_card_table_align_pointer (obj);
1598 mword obj_size = sgen_mono_array_size (vt, arr, &bounds_size, sgen_vtable_get_descriptor (vt));
1599 /* We don't want to scan the bounds entries at the end of multidimensional arrays */
1600 char *obj_end = (char*)obj + obj_size - bounds_size;
1602 size_t extra_idx = 0;
1604 mword desc = (mword)klass->element_class->gc_descr;
1605 int elem_size = mono_array_element_size (klass);
1607 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1608 guint8 *overflow_scan_end = NULL;
1611 #ifdef SGEN_OBJECT_LAYOUT_STATISTICS
1612 if (klass->element_class->valuetype)
1613 sgen_object_layout_scanned_vtype_array ();
1615 sgen_object_layout_scanned_ref_array ();
1621 card_data = sgen_card_table_get_card_scan_address ((mword)obj);
1623 card_base = card_data;
1624 card_count = sgen_card_table_number_of_cards_in_range ((mword)obj, obj_size);
1625 card_data_end = card_data + card_count;
1628 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1629 /*Check for overflow and if so, setup to scan in two steps*/
1630 if (!cards && card_data_end >= SGEN_SHADOW_CARDTABLE_END) {
1631 overflow_scan_end = sgen_shadow_cardtable + (card_data_end - SGEN_SHADOW_CARDTABLE_END);
1632 card_data_end = SGEN_SHADOW_CARDTABLE_END;
1638 card_data = sgen_find_next_card (card_data, card_data_end);
1639 for (; card_data < card_data_end; card_data = sgen_find_next_card (card_data + 1, card_data_end)) {
1641 size_t idx = (card_data - card_base) + extra_idx;
1642 char *start = (char*)(obj_start + idx * CARD_SIZE_IN_BYTES);
1643 char *card_end = start + CARD_SIZE_IN_BYTES;
1644 char *first_elem, *elem;
1646 HEAVY_STAT (++los_marked_cards);
1649 sgen_card_table_prepare_card_for_scanning (card_data);
1651 card_end = MIN (card_end, obj_end);
1653 if (start <= (char*)arr->vector)
1656 index = ARRAY_OBJ_INDEX (start, obj, elem_size);
1658 elem = first_elem = (char*)mono_array_addr_with_size_fast ((MonoArray*)obj, elem_size, index);
1659 if (klass->element_class->valuetype) {
1660 ScanVTypeFunc scan_vtype_func = ctx.ops->scan_vtype;
1662 for (; elem < card_end; elem += elem_size)
1663 scan_vtype_func (obj, elem, desc, ctx.queue BINARY_PROTOCOL_ARG (elem_size));
1665 ScanPtrFieldFunc scan_ptr_field_func = ctx.ops->scan_ptr_field;
1667 HEAVY_STAT (++los_array_cards);
1668 for (; elem < card_end; elem += SIZEOF_VOID_P)
1669 scan_ptr_field_func (obj, (GCObject**)elem, ctx.queue);
1672 binary_protocol_card_scan (first_elem, elem - first_elem);
1675 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1676 if (overflow_scan_end) {
1677 extra_idx = card_data - card_base;
1678 card_base = card_data = sgen_shadow_cardtable;
1679 card_data_end = overflow_scan_end;
1680 overflow_scan_end = NULL;
1691 * Array and string allocation
1695 mono_gc_alloc_vector (MonoVTable *vtable, size_t size, uintptr_t max_length)
1700 if (!SGEN_CAN_ALIGN_UP (size))
1703 #ifndef DISABLE_CRITICAL_REGION
1704 ENTER_CRITICAL_REGION;
1705 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1707 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1708 arr->max_length = (mono_array_size_t)max_length;
1709 EXIT_CRITICAL_REGION;
1712 EXIT_CRITICAL_REGION;
1717 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1718 if (G_UNLIKELY (!arr)) {
1723 arr->max_length = (mono_array_size_t)max_length;
1728 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1729 mono_profiler_allocation (&arr->obj);
1731 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Vector has incorrect size.");
1736 mono_gc_alloc_array (MonoVTable *vtable, size_t size, uintptr_t max_length, uintptr_t bounds_size)
1739 MonoArrayBounds *bounds;
1742 if (!SGEN_CAN_ALIGN_UP (size))
1745 #ifndef DISABLE_CRITICAL_REGION
1746 ENTER_CRITICAL_REGION;
1747 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1749 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1750 arr->max_length = (mono_array_size_t)max_length;
1752 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1753 arr->bounds = bounds;
1754 EXIT_CRITICAL_REGION;
1757 EXIT_CRITICAL_REGION;
1762 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1763 if (G_UNLIKELY (!arr)) {
1768 arr->max_length = (mono_array_size_t)max_length;
1770 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1771 arr->bounds = bounds;
1776 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1777 mono_profiler_allocation (&arr->obj);
1779 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Array has incorrect size.");
1784 mono_gc_alloc_string (MonoVTable *vtable, size_t size, gint32 len)
1789 if (!SGEN_CAN_ALIGN_UP (size))
1792 #ifndef DISABLE_CRITICAL_REGION
1793 ENTER_CRITICAL_REGION;
1794 str = (MonoString*)sgen_try_alloc_obj_nolock (vtable, size);
1796 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1798 EXIT_CRITICAL_REGION;
1801 EXIT_CRITICAL_REGION;
1806 str = (MonoString*)sgen_alloc_obj_nolock (vtable, size);
1807 if (G_UNLIKELY (!str)) {
1817 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1818 mono_profiler_allocation (&str->object);
1828 mono_gc_set_string_length (MonoString *str, gint32 new_length)
1830 mono_unichar2 *new_end = str->chars + new_length;
1832 /* zero the discarded string. This null-delimits the string and allows
1833 * the space to be reclaimed by SGen. */
1835 if (nursery_canaries_enabled () && sgen_ptr_in_nursery (str)) {
1836 CHECK_CANARY_FOR_OBJECT ((GCObject*)str, TRUE);
1837 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2) + CANARY_SIZE);
1838 memcpy (new_end + 1 , CANARY_STRING, CANARY_SIZE);
1840 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2));
1843 str->length = new_length;
1850 #define GC_ROOT_NUM 32
1852 int count; /* must be the first field */
1853 void *objects [GC_ROOT_NUM];
1854 int root_types [GC_ROOT_NUM];
1855 uintptr_t extra_info [GC_ROOT_NUM];
1859 notify_gc_roots (GCRootReport *report)
1863 mono_profiler_gc_roots (report->count, report->objects, report->root_types, report->extra_info);
1868 add_profile_gc_root (GCRootReport *report, void *object, int rtype, uintptr_t extra_info)
1870 if (report->count == GC_ROOT_NUM)
1871 notify_gc_roots (report);
1872 report->objects [report->count] = object;
1873 report->root_types [report->count] = rtype;
1874 report->extra_info [report->count++] = (uintptr_t)SGEN_LOAD_VTABLE (object)->klass;
1878 sgen_client_nursery_objects_pinned (void **definitely_pinned, int count)
1880 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS) {
1881 GCRootReport report;
1884 for (idx = 0; idx < count; ++idx)
1885 add_profile_gc_root (&report, definitely_pinned [idx], MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
1886 notify_gc_roots (&report);
1891 report_finalizer_roots_from_queue (SgenPointerQueue *queue)
1893 GCRootReport report;
1897 for (i = 0; i < queue->next_slot; ++i) {
1898 void *obj = queue->data [i];
1901 add_profile_gc_root (&report, obj, MONO_PROFILE_GC_ROOT_FINALIZER, 0);
1903 notify_gc_roots (&report);
1907 report_finalizer_roots (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
1909 report_finalizer_roots_from_queue (fin_ready_queue);
1910 report_finalizer_roots_from_queue (critical_fin_queue);
1913 static GCRootReport *root_report;
1916 single_arg_report_root (MonoObject **obj, void *gc_data)
1919 add_profile_gc_root (root_report, *obj, MONO_PROFILE_GC_ROOT_OTHER, 0);
1923 precisely_report_roots_from (GCRootReport *report, void** start_root, void** end_root, mword desc)
1925 switch (desc & ROOT_DESC_TYPE_MASK) {
1926 case ROOT_DESC_BITMAP:
1927 desc >>= ROOT_DESC_TYPE_SHIFT;
1929 if ((desc & 1) && *start_root) {
1930 add_profile_gc_root (report, *start_root, MONO_PROFILE_GC_ROOT_OTHER, 0);
1936 case ROOT_DESC_COMPLEX: {
1937 gsize *bitmap_data = (gsize *)sgen_get_complex_descriptor_bitmap (desc);
1938 gsize bwords = (*bitmap_data) - 1;
1939 void **start_run = start_root;
1941 while (bwords-- > 0) {
1942 gsize bmap = *bitmap_data++;
1943 void **objptr = start_run;
1945 if ((bmap & 1) && *objptr) {
1946 add_profile_gc_root (report, *objptr, MONO_PROFILE_GC_ROOT_OTHER, 0);
1951 start_run += GC_BITS_PER_WORD;
1955 case ROOT_DESC_VECTOR: {
1958 for (p = start_root; p < end_root; p++) {
1960 add_profile_gc_root (report, *p, MONO_PROFILE_GC_ROOT_OTHER, 0);
1964 case ROOT_DESC_USER: {
1965 MonoGCRootMarkFunc marker = (MonoGCRootMarkFunc)sgen_get_user_descriptor_func (desc);
1966 root_report = report;
1967 marker ((MonoObject**)start_root, single_arg_report_root, NULL);
1970 case ROOT_DESC_RUN_LEN:
1971 g_assert_not_reached ();
1973 g_assert_not_reached ();
1978 report_registered_roots_by_type (int root_type)
1980 GCRootReport report;
1984 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], void **, start_root, RootRecord *, root) {
1985 SGEN_LOG (6, "Precise root scan %p-%p (desc: %p)", start_root, root->end_root, (void*)root->root_desc);
1986 precisely_report_roots_from (&report, start_root, (void**)root->end_root, root->root_desc);
1987 } SGEN_HASH_TABLE_FOREACH_END;
1988 notify_gc_roots (&report);
1992 report_registered_roots (void)
1994 report_registered_roots_by_type (ROOT_TYPE_NORMAL);
1995 report_registered_roots_by_type (ROOT_TYPE_WBARRIER);
1999 sgen_client_collecting_minor (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2001 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2002 report_registered_roots ();
2003 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2004 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2007 static GCRootReport major_root_report;
2008 static gboolean profile_roots;
2011 sgen_client_collecting_major_1 (void)
2013 profile_roots = mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS;
2014 memset (&major_root_report, 0, sizeof (GCRootReport));
2018 sgen_client_pinned_los_object (GCObject *obj)
2021 add_profile_gc_root (&major_root_report, (char*)obj, MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
2025 sgen_client_collecting_major_2 (void)
2028 notify_gc_roots (&major_root_report);
2030 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2031 report_registered_roots ();
2035 sgen_client_collecting_major_3 (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2037 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2038 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2041 #define MOVED_OBJECTS_NUM 64
2042 static void *moved_objects [MOVED_OBJECTS_NUM];
2043 static int moved_objects_idx = 0;
2045 static SgenPointerQueue moved_objects_queue = SGEN_POINTER_QUEUE_INIT (INTERNAL_MEM_MOVED_OBJECT);
2048 mono_sgen_register_moved_object (void *obj, void *destination)
2051 * This function can be called from SGen's worker threads. We want to try
2052 * and avoid exposing those threads to the profiler API, so queue up move
2053 * events and send them later when the main GC thread calls
2054 * mono_sgen_gc_event_moves ().
2056 * TODO: Once SGen has multiple worker threads, we need to switch to a
2057 * lock-free data structure for the queue as multiple threads will be
2058 * adding to it at the same time.
2060 if (sgen_thread_pool_is_thread_pool_thread (mono_native_thread_id_get ())) {
2061 sgen_pointer_queue_add (&moved_objects_queue, obj);
2062 sgen_pointer_queue_add (&moved_objects_queue, destination);
2064 if (moved_objects_idx == MOVED_OBJECTS_NUM) {
2065 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2066 moved_objects_idx = 0;
2069 moved_objects [moved_objects_idx++] = obj;
2070 moved_objects [moved_objects_idx++] = destination;
2075 mono_sgen_gc_event_moves (void)
2077 while (!sgen_pointer_queue_is_empty (&moved_objects_queue)) {
2078 void *dst = sgen_pointer_queue_pop (&moved_objects_queue);
2079 void *src = sgen_pointer_queue_pop (&moved_objects_queue);
2081 mono_sgen_register_moved_object (src, dst);
2084 if (moved_objects_idx) {
2085 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2086 moved_objects_idx = 0;
2094 #define REFS_SIZE 128
2097 MonoGCReferences callback;
2101 MonoObject *refs [REFS_SIZE];
2102 uintptr_t offsets [REFS_SIZE];
2106 #define HANDLE_PTR(ptr,obj) do { \
2108 if (hwi->count == REFS_SIZE) { \
2109 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data); \
2113 hwi->offsets [hwi->count] = (char*)(ptr)-(char*)start; \
2114 hwi->refs [hwi->count++] = *(ptr); \
2119 collect_references (HeapWalkInfo *hwi, GCObject *obj, size_t size)
2121 char *start = (char*)obj;
2122 mword desc = sgen_obj_get_descriptor (obj);
2124 #include "sgen/sgen-scan-object.h"
2128 walk_references (GCObject *start, size_t size, void *data)
2130 HeapWalkInfo *hwi = (HeapWalkInfo *)data;
2133 collect_references (hwi, start, size);
2134 if (hwi->count || !hwi->called)
2135 hwi->callback (start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data);
2139 * mono_gc_walk_heap:
2140 * \param flags flags for future use
2141 * \param callback a function pointer called for each object in the heap
2142 * \param data a user data pointer that is passed to callback
2143 * This function can be used to iterate over all the live objects in the heap;
2144 * for each object, \p callback is invoked, providing info about the object's
2145 * location in memory, its class, its size and the objects it references.
2146 * For each referenced object its offset from the object address is
2147 * reported in the offsets array.
2148 * The object references may be buffered, so the callback may be invoked
2149 * multiple times for the same object: in all but the first call, the size
2150 * argument will be zero.
2151 * Note that this function can be only called in the \c MONO_GC_EVENT_PRE_START_WORLD
2152 * profiler event handler.
2153 * \returns a non-zero value if the GC doesn't support heap walking
2156 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
2161 hwi.callback = callback;
2164 sgen_clear_nursery_fragments ();
2165 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data, walk_references, &hwi, FALSE, TRUE);
2167 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, walk_references, &hwi);
2168 sgen_los_iterate_objects (walk_references, &hwi);
2178 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
2180 gc_callbacks = *callbacks;
2184 mono_gc_get_gc_callbacks ()
2186 return &gc_callbacks;
2190 sgen_client_thread_register (SgenThreadInfo* info, void *stack_bottom_fallback)
2193 guint8 *staddr = NULL;
2195 mono_tls_set_sgen_thread_info (info);
2197 info->client_info.skip = 0;
2199 info->client_info.stack_start = NULL;
2201 #ifdef SGEN_POSIX_STW
2202 info->client_info.stop_count = -1;
2203 info->client_info.signal = 0;
2206 mono_thread_info_get_stack_bounds (&staddr, &stsize);
2208 info->client_info.stack_start_limit = staddr;
2209 info->client_info.stack_end = staddr + stsize;
2211 gsize stack_bottom = (gsize)stack_bottom_fallback;
2212 stack_bottom += 4095;
2213 stack_bottom &= ~4095;
2214 info->client_info.stack_end = (char*)stack_bottom;
2217 memset (&info->client_info.ctx, 0, sizeof (MonoContext));
2219 if (mono_gc_get_gc_callbacks ()->thread_attach_func)
2220 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2222 binary_protocol_thread_register ((gpointer)mono_thread_info_get_tid (info));
2224 SGEN_LOG (3, "registered thread %p (%p) stack end %p", info, (gpointer)mono_thread_info_get_tid (info), info->client_info.stack_end);
2226 info->client_info.info.handle_stack = mono_handle_stack_alloc ();
2230 sgen_client_thread_unregister (SgenThreadInfo *p)
2232 MonoNativeThreadId tid;
2234 mono_tls_set_sgen_thread_info (NULL);
2236 tid = mono_thread_info_get_tid (p);
2238 if (p->client_info.info.runtime_thread)
2239 mono_threads_add_joinable_thread ((gpointer)tid);
2241 if (mono_gc_get_gc_callbacks ()->thread_detach_func) {
2242 mono_gc_get_gc_callbacks ()->thread_detach_func (p->client_info.runtime_data);
2243 p->client_info.runtime_data = NULL;
2246 binary_protocol_thread_unregister ((gpointer)tid);
2247 SGEN_LOG (3, "unregister thread %p (%p)", p, (gpointer)tid);
2249 HandleStack *handles = (HandleStack*) p->client_info.info.handle_stack;
2250 p->client_info.info.handle_stack = NULL;
2251 mono_handle_stack_free (handles);
2255 mono_gc_set_skip_thread (gboolean skip)
2257 SgenThreadInfo *info = mono_thread_info_current ();
2260 info->client_info.gc_disabled = skip;
2264 /* If we skip scanning a thread with a non-empty handle stack, we may move an
2265 * object but fail to update the reference in the handle.
2267 HandleStack *stack = info->client_info.info.handle_stack;
2268 g_assert (stack == NULL || mono_handle_stack_is_empty (stack));
2273 thread_in_critical_region (SgenThreadInfo *info)
2275 return info->client_info.in_critical_region;
2279 sgen_thread_attach (SgenThreadInfo *info)
2281 if (mono_gc_get_gc_callbacks ()->thread_attach_func && !info->client_info.runtime_data)
2282 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2286 sgen_thread_detach (SgenThreadInfo *p)
2288 /* If a delegate is passed to native code and invoked on a thread we dont
2289 * know about, marshal will register it with mono_threads_attach_coop, but
2290 * we have no way of knowing when that thread goes away. SGen has a TSD
2291 * so we assume that if the domain is still registered, we can detach
2294 if (mono_thread_internal_current_is_attached ())
2295 mono_thread_detach_internal (mono_thread_internal_current ());
2299 mono_gc_register_thread (void *baseptr)
2301 return mono_thread_info_attach (baseptr) != NULL;
2305 mono_gc_is_gc_thread (void)
2309 result = mono_thread_info_current () != NULL;
2315 sgen_client_thread_register_worker (void)
2317 mono_thread_info_register_small_id ();
2318 mono_native_thread_set_name (mono_native_thread_id_get (), "SGen worker");
2321 /* Variables holding start/end nursery so it won't have to be passed at every call */
2322 static void *scan_area_arg_start, *scan_area_arg_end;
2325 mono_gc_conservatively_scan_area (void *start, void *end)
2327 sgen_conservatively_pin_objects_from ((void **)start, (void **)end, scan_area_arg_start, scan_area_arg_end, PIN_TYPE_STACK);
2331 mono_gc_scan_object (void *obj, void *gc_data)
2333 ScanCopyContext *ctx = (ScanCopyContext *)gc_data;
2334 ctx->ops->copy_or_mark_object ((GCObject**)&obj, ctx->queue);
2339 void **start_nursery;
2341 } PinHandleStackInteriorPtrData;
2343 /* Called when we're scanning the handle stack imprecisely and we encounter a pointer into the
2344 middle of an object.
2347 pin_handle_stack_interior_ptrs (void **ptr_slot, void *user_data)
2349 PinHandleStackInteriorPtrData *ud = (PinHandleStackInteriorPtrData *)user_data;
2350 sgen_conservatively_pin_objects_from (ptr_slot, ptr_slot+1, ud->start_nursery, ud->end_nursery, PIN_TYPE_STACK);
2355 * Mark from thread stacks and registers.
2358 sgen_client_scan_thread_data (void *start_nursery, void *end_nursery, gboolean precise, ScanCopyContext ctx)
2360 scan_area_arg_start = start_nursery;
2361 scan_area_arg_end = end_nursery;
2363 FOREACH_THREAD (info) {
2364 int skip_reason = 0;
2365 void *aligned_stack_start;
2367 if (info->client_info.skip) {
2368 SGEN_LOG (3, "Skipping dead thread %p, range: %p-%p, size: %zd", info, info->client_info.stack_start, info->client_info.stack_end, (char*)info->client_info.stack_end - (char*)info->client_info.stack_start);
2370 } else if (info->client_info.gc_disabled) {
2371 SGEN_LOG (3, "GC disabled for thread %p, range: %p-%p, size: %zd", info, info->client_info.stack_start, info->client_info.stack_end, (char*)info->client_info.stack_end - (char*)info->client_info.stack_start);
2373 } else if (!mono_thread_info_is_live (info)) {
2374 SGEN_LOG (3, "Skipping non-running thread %p, range: %p-%p, size: %zd (state %x)", info, info->client_info.stack_start, info->client_info.stack_end, (char*)info->client_info.stack_end - (char*)info->client_info.stack_start, info->client_info.info.thread_state);
2376 } else if (!info->client_info.stack_start) {
2377 SGEN_LOG (3, "Skipping starting or detaching thread %p", info);
2381 binary_protocol_scan_stack ((gpointer)mono_thread_info_get_tid (info), info->client_info.stack_start, info->client_info.stack_end, skip_reason);
2385 /* If we skip a thread with a non-empty handle stack and then it
2386 * resumes running we may potentially move an object but fail to
2387 * update the reference in the handle.
2389 HandleStack *stack = info->client_info.info.handle_stack;
2390 g_assert (stack == NULL || mono_handle_stack_is_empty (stack));
2395 g_assert (info->client_info.stack_start);
2396 g_assert (info->client_info.stack_end);
2398 aligned_stack_start = (void*)(mword) ALIGN_TO ((mword)info->client_info.stack_start, SIZEOF_VOID_P);
2400 /* Windows uses a guard page before the committed stack memory pages to detect when the
2401 stack needs to be grown. If we suspend a thread just after a function prolog has
2402 decremented the stack pointer to point into the guard page but before the thread has
2403 been able to read or write to that page, starting the stack scan at aligned_stack_start
2404 will raise a STATUS_GUARD_PAGE_VIOLATION and the process will crash. This code uses
2405 VirtualQuery() to determine whether stack_start points into the guard page and then
2406 updates aligned_stack_start to point at the next non-guard page. */
2407 MEMORY_BASIC_INFORMATION mem_info;
2408 SIZE_T result = VirtualQuery(info->client_info.stack_start, &mem_info, sizeof(mem_info));
2409 g_assert (result != 0);
2410 if (mem_info.Protect & PAGE_GUARD) {
2411 aligned_stack_start = ((char*) mem_info.BaseAddress) + mem_info.RegionSize;
2415 g_assert (info->client_info.suspend_done);
2416 SGEN_LOG (3, "Scanning thread %p, range: %p-%p, size: %zd, pinned=%zd", info, info->client_info.stack_start, info->client_info.stack_end, (char*)info->client_info.stack_end - (char*)info->client_info.stack_start, sgen_get_pinned_count ());
2417 if (mono_gc_get_gc_callbacks ()->thread_mark_func && !conservative_stack_mark) {
2418 mono_gc_get_gc_callbacks ()->thread_mark_func (info->client_info.runtime_data, (guint8 *)aligned_stack_start, (guint8 *)info->client_info.stack_end, precise, &ctx);
2419 } else if (!precise) {
2420 if (!conservative_stack_mark) {
2421 fprintf (stderr, "Precise stack mark not supported - disabling.\n");
2422 conservative_stack_mark = TRUE;
2424 //FIXME we should eventually use the new stack_mark from coop
2425 sgen_conservatively_pin_objects_from ((void **)aligned_stack_start, (void **)info->client_info.stack_end, start_nursery, end_nursery, PIN_TYPE_STACK);
2429 sgen_conservatively_pin_objects_from ((void**)&info->client_info.ctx, (void**)(&info->client_info.ctx + 1),
2430 start_nursery, end_nursery, PIN_TYPE_STACK);
2433 // This is used on Coop GC for platforms where we cannot get the data for individual registers.
2434 // We force a spill of all registers into the stack and pass a chunk of data into sgen.
2435 //FIXME under coop, for now, what we need to ensure is that we scan any extra memory from info->client_info.stack_end to stack_mark
2436 MonoThreadUnwindState *state = &info->client_info.info.thread_saved_state [SELF_SUSPEND_STATE_INDEX];
2437 if (state && state->gc_stackdata) {
2438 sgen_conservatively_pin_objects_from ((void **)state->gc_stackdata, (void**)((char*)state->gc_stackdata + state->gc_stackdata_size),
2439 start_nursery, end_nursery, PIN_TYPE_STACK);
2443 if (info->client_info.info.handle_stack) {
2445 Make two passes over the handle stack. On the imprecise pass, pin all
2446 objects where the handle points into the interior of the object. On the
2447 precise pass, copy or mark all the objects that have handles to the
2448 beginning of the object.
2451 mono_handle_stack_scan ((HandleStack*)info->client_info.info.handle_stack, (GcScanFunc)ctx.ops->copy_or_mark_object, ctx.queue, precise);
2453 PinHandleStackInteriorPtrData ud = { .start_nursery = start_nursery,
2454 .end_nursery = end_nursery,
2456 mono_handle_stack_scan ((HandleStack*)info->client_info.info.handle_stack, pin_handle_stack_interior_ptrs, &ud, precise);
2459 } FOREACH_THREAD_END
2463 * mono_gc_set_stack_end:
2465 * Set the end of the current threads stack to STACK_END. The stack space between
2466 * STACK_END and the real end of the threads stack will not be scanned during collections.
2469 mono_gc_set_stack_end (void *stack_end)
2471 SgenThreadInfo *info;
2474 info = mono_thread_info_current ();
2476 SGEN_ASSERT (0, stack_end < info->client_info.stack_end, "Can only lower stack end");
2477 info->client_info.stack_end = stack_end;
2487 mono_gc_register_root (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2489 return sgen_register_root (start, size, descr, descr ? ROOT_TYPE_NORMAL : ROOT_TYPE_PINNED, source, msg);
2493 mono_gc_register_root_wbarrier (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2495 return sgen_register_root (start, size, descr, ROOT_TYPE_WBARRIER, source, msg);
2499 mono_gc_deregister_root (char* addr)
2501 sgen_deregister_root (addr);
2510 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
2514 mono_threads_join_lock ();
2515 res = pthread_create (new_thread, attr, start_routine, arg);
2516 mono_threads_join_unlock ();
2527 sgen_client_total_allocated_heap_changed (size_t allocated_heap)
2529 mono_runtime_resource_check_limit (MONO_RESOURCE_GC_HEAP, allocated_heap);
2533 mono_gc_user_markers_supported (void)
2539 mono_object_is_alive (MonoObject* o)
2545 mono_gc_get_generation (MonoObject *obj)
2547 if (sgen_ptr_in_nursery (obj))
2553 mono_gc_get_gc_name (void)
2559 mono_gc_get_description (void)
2561 #ifdef HAVE_CONC_GC_AS_DEFAULT
2562 return g_strdup ("sgen (concurrent by default)");
2564 return g_strdup ("sgen");
2569 mono_gc_set_desktop_mode (void)
2574 mono_gc_is_moving (void)
2580 mono_gc_is_disabled (void)
2586 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
2593 mono_gc_max_generation (void)
2599 mono_gc_precise_stack_mark_enabled (void)
2601 return !conservative_stack_mark;
2605 mono_gc_collect (int generation)
2607 sgen_gc_collect (generation);
2611 mono_gc_collection_count (int generation)
2613 return sgen_gc_collection_count (generation);
2617 mono_gc_get_used_size (void)
2619 return (int64_t)sgen_gc_get_used_size ();
2623 mono_gc_get_heap_size (void)
2625 return (int64_t)sgen_gc_get_total_heap_allocation ();
2629 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
2631 return sgen_make_user_root_descriptor (marker);
2635 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
2637 return SGEN_DESC_STRING;
2641 mono_gc_get_nursery (int *shift_bits, size_t *size)
2643 *size = sgen_nursery_size;
2644 *shift_bits = DEFAULT_NURSERY_BITS;
2645 return sgen_get_nursery_start ();
2649 mono_gc_get_los_limit (void)
2651 return SGEN_MAX_SMALL_OBJ_SIZE;
2655 sgen_client_default_metadata (void)
2657 return mono_domain_get ();
2661 sgen_client_metadata_for_object (GCObject *obj)
2663 return mono_object_domain (obj);
2667 * mono_gchandle_is_in_domain:
2668 * \param gchandle a GCHandle's handle.
2669 * \param domain An application domain.
2670 * \returns TRUE if the object wrapped by the \p gchandle belongs to the specific \p domain.
2673 mono_gchandle_is_in_domain (guint32 gchandle, MonoDomain *domain)
2675 MonoDomain *gchandle_domain = (MonoDomain *)sgen_gchandle_get_metadata (gchandle);
2676 return domain->domain_id == gchandle_domain->domain_id;
2680 * mono_gchandle_free_domain:
2681 * \param unloading domain that is unloading
2683 * Function used internally to cleanup any GC handle for objects belonging
2684 * to the specified domain during appdomain unload.
2687 mono_gchandle_free_domain (MonoDomain *unloading)
2692 null_link_if_in_domain (gpointer hidden, GCHandleType handle_type, int max_generation, gpointer user)
2694 MonoDomain *unloading_domain = (MonoDomain *)user;
2695 MonoDomain *obj_domain;
2696 gboolean is_weak = MONO_GC_HANDLE_TYPE_IS_WEAK (handle_type);
2697 if (MONO_GC_HANDLE_IS_OBJECT_POINTER (hidden)) {
2698 MonoObject *obj = (MonoObject *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2699 obj_domain = mono_object_domain (obj);
2701 obj_domain = (MonoDomain *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2703 if (unloading_domain->domain_id == obj_domain->domain_id)
2709 sgen_null_links_for_domain (MonoDomain *domain)
2712 for (type = HANDLE_TYPE_MIN; type < HANDLE_TYPE_MAX; ++type)
2713 sgen_gchandle_iterate ((GCHandleType)type, GENERATION_OLD, null_link_if_in_domain, domain);
2717 mono_gchandle_set_target (guint32 gchandle, MonoObject *obj)
2719 sgen_gchandle_set_target (gchandle, obj);
2723 sgen_client_gchandle_created (int handle_type, GCObject *obj, guint32 handle)
2725 #ifndef DISABLE_PERFCOUNTERS
2726 mono_perfcounters->gc_num_handles++;
2728 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_CREATED, handle_type, handle, obj);
2732 sgen_client_gchandle_destroyed (int handle_type, guint32 handle)
2734 #ifndef DISABLE_PERFCOUNTERS
2735 mono_perfcounters->gc_num_handles--;
2737 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_DESTROYED, handle_type, handle, NULL);
2741 sgen_client_ensure_weak_gchandles_accessible (void)
2744 * During the second bridge processing step the world is
2745 * running again. That step processes all weak links once
2746 * more to null those that refer to dead objects. Before that
2747 * is completed, those links must not be followed, so we
2748 * conservatively wait for bridge processing when any weak
2749 * link is dereferenced.
2751 /* FIXME: A GC can occur after this check fails, in which case we
2752 * should wait for bridge processing but would fail to do so.
2754 if (G_UNLIKELY (bridge_processing_in_progress))
2755 mono_gc_wait_for_bridge_processing ();
2759 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
2763 result = func (data);
2764 UNLOCK_INTERRUPTION;
2769 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
2775 mono_gc_get_card_table (int *shift_bits, gpointer *mask)
2777 return sgen_get_card_table_configuration (shift_bits, mask);
2781 mono_gc_card_table_nursery_check (void)
2783 return !sgen_get_major_collector ()->is_concurrent;
2786 /* Negative value to remove */
2788 mono_gc_add_memory_pressure (gint64 value)
2790 /* FIXME: Implement at some point? */
2798 sgen_client_degraded_allocation (size_t size)
2800 static int last_major_gc_warned = -1;
2801 static int num_degraded = 0;
2803 if (last_major_gc_warned < (int)gc_stats.major_gc_count) {
2805 if (num_degraded == 1 || num_degraded == 3)
2806 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Degraded allocation. Consider increasing nursery-size if the warning persists.");
2807 else if (num_degraded == 10)
2808 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Repeated degraded allocation. Consider increasing nursery-size.");
2809 last_major_gc_warned = gc_stats.major_gc_count;
2818 sgen_client_description_for_internal_mem_type (int type)
2821 case INTERNAL_MEM_EPHEMERON_LINK: return "ephemeron-link";
2822 case INTERNAL_MEM_MOVED_OBJECT: return "moved-object";
2829 sgen_client_pre_collection_checks (void)
2831 if (sgen_mono_xdomain_checks) {
2832 sgen_clear_nursery_fragments ();
2833 sgen_check_for_xdomain_refs ();
2838 sgen_client_vtable_is_inited (MonoVTable *vt)
2840 return vt->klass->inited;
2844 sgen_client_vtable_get_namespace (MonoVTable *vt)
2846 return vt->klass->name_space;
2850 sgen_client_vtable_get_name (MonoVTable *vt)
2852 return vt->klass->name;
2860 sgen_client_init (void)
2863 MonoThreadInfoCallbacks cb;
2865 cb.thread_register = sgen_thread_register;
2866 cb.thread_detach = sgen_thread_detach;
2867 cb.thread_unregister = sgen_thread_unregister;
2868 cb.thread_attach = sgen_thread_attach;
2869 cb.mono_thread_in_critical_region = thread_in_critical_region;
2870 cb.ip_in_critical_region = ip_in_critical_region;
2872 mono_threads_init (&cb, sizeof (SgenThreadInfo));
2874 ///* Keep this the default for now */
2875 /* Precise marking is broken on all supported targets. Disable until fixed. */
2876 conservative_stack_mark = TRUE;
2878 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_EPHEMERON_LINK, sizeof (EphemeronLinkNode));
2880 mono_sgen_init_stw ();
2882 mono_tls_init_gc_keys ();
2884 mono_gc_register_thread (&dummy);
2888 sgen_client_handle_gc_param (const char *opt)
2890 if (g_str_has_prefix (opt, "stack-mark=")) {
2891 opt = strchr (opt, '=') + 1;
2892 if (!strcmp (opt, "precise")) {
2893 conservative_stack_mark = FALSE;
2894 } else if (!strcmp (opt, "conservative")) {
2895 conservative_stack_mark = TRUE;
2897 sgen_env_var_error (MONO_GC_PARAMS_NAME, conservative_stack_mark ? "Using `conservative`." : "Using `precise`.",
2898 "Invalid value `%s` for `stack-mark` option, possible values are: `precise`, `conservative`.", opt);
2900 } else if (g_str_has_prefix (opt, "bridge-implementation=")) {
2901 opt = strchr (opt, '=') + 1;
2902 sgen_set_bridge_implementation (opt);
2903 } else if (g_str_has_prefix (opt, "toggleref-test")) {
2904 /* FIXME: This should probably in MONO_GC_DEBUG */
2905 sgen_register_test_toggleref_callback ();
2906 } else if (!sgen_bridge_handle_gc_param (opt)) {
2913 sgen_client_print_gc_params_usage (void)
2915 fprintf (stderr, " stack-mark=MARK-METHOD (where MARK-METHOD is 'precise' or 'conservative')\n");
2919 sgen_client_handle_gc_debug (const char *opt)
2921 if (!strcmp (opt, "xdomain-checks")) {
2922 sgen_mono_xdomain_checks = TRUE;
2923 } else if (!strcmp (opt, "do-not-finalize")) {
2924 mono_do_not_finalize = TRUE;
2925 } else if (g_str_has_prefix (opt, "do-not-finalize=")) {
2926 opt = strchr (opt, '=') + 1;
2927 mono_do_not_finalize = TRUE;
2928 mono_do_not_finalize_class_names = g_strsplit (opt, ",", 0);
2929 } else if (!strcmp (opt, "log-finalizers")) {
2930 log_finalizers = TRUE;
2931 } else if (!strcmp (opt, "no-managed-allocator")) {
2932 sgen_set_use_managed_allocator (FALSE);
2933 } else if (!sgen_bridge_handle_gc_debug (opt)) {
2940 sgen_client_print_gc_debug_usage (void)
2942 fprintf (stderr, " xdomain-checks\n");
2943 fprintf (stderr, " do-not-finalize\n");
2944 fprintf (stderr, " log-finalizers\n");
2945 fprintf (stderr, " no-managed-allocator\n");
2946 sgen_bridge_print_gc_debug_usage ();
2951 sgen_client_get_provenance (void)
2953 #ifdef SGEN_OBJECT_PROVENANCE
2954 MonoGCCallbacks *cb = mono_gc_get_gc_callbacks ();
2955 gpointer (*get_provenance_func) (void);
2958 get_provenance_func = cb->get_provenance_func;
2959 if (get_provenance_func)
2960 return get_provenance_func ();
2968 sgen_client_describe_invalid_pointer (GCObject *ptr)
2970 sgen_bridge_describe_pointer (ptr);
2973 static gboolean gc_inited;
2976 mono_gc_base_init (void)
2981 mono_counters_init ();
2984 mono_w32handle_init ();
2987 #ifdef HEAVY_STATISTICS
2988 mono_counters_register ("los marked cards", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_marked_cards);
2989 mono_counters_register ("los array cards scanned ", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_cards);
2990 mono_counters_register ("los array remsets", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_remsets);
2992 mono_counters_register ("WBarrier set arrayref", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_set_arrayref);
2993 mono_counters_register ("WBarrier value copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_value_copy);
2994 mono_counters_register ("WBarrier object copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_object_copy);
3003 mono_gc_base_cleanup (void)
3005 sgen_thread_pool_shutdown ();
3007 // We should have consumed any outstanding moves.
3008 g_assert (sgen_pointer_queue_is_empty (&moved_objects_queue));
3012 mono_gc_is_null (void)