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-workers.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:
533 mono_gc_invoke_finalizers (void)
535 return sgen_gc_invoke_finalizers ();
539 * mono_gc_pending_finalizers:
542 mono_gc_pending_finalizers (void)
544 return sgen_have_pending_finalizers ();
548 sgen_client_finalize_notify (void)
550 mono_gc_finalize_notify ();
554 mono_gc_register_for_finalization (MonoObject *obj, void *user_data)
556 sgen_object_register_for_finalization (obj, user_data);
560 object_in_domain_predicate (MonoObject *obj, void *user_data)
562 MonoDomain *domain = (MonoDomain *)user_data;
563 if (mono_object_domain (obj) == domain) {
564 SGEN_LOG (5, "Unregistering finalizer for object: %p (%s)", obj, sgen_client_vtable_get_name (SGEN_LOAD_VTABLE (obj)));
571 * mono_gc_finalizers_for_domain:
572 * \param domain the unloading appdomain
573 * \param out_array output array
574 * \param out_size size of output array
575 * Enqueue for finalization all objects that belong to the unloading appdomain \p domain.
576 * \p suspend is used for early termination of the enqueuing process.
579 mono_gc_finalize_domain (MonoDomain *domain)
581 sgen_finalize_if (object_in_domain_predicate, domain);
585 mono_gc_suspend_finalizers (void)
587 sgen_set_suspend_finalizers ();
594 typedef struct _EphemeronLinkNode EphemeronLinkNode;
596 struct _EphemeronLinkNode {
597 EphemeronLinkNode *next;
606 static EphemeronLinkNode *ephemeron_list;
608 /* LOCKING: requires that the GC lock is held */
610 null_ephemerons_for_domain (MonoDomain *domain)
612 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
615 MonoObject *object = (MonoObject*)current->array;
618 SGEN_ASSERT (0, object->vtable, "Can't have objects without vtables.");
620 if (object && object->vtable->domain == domain) {
621 EphemeronLinkNode *tmp = current;
624 prev->next = current->next;
626 ephemeron_list = current->next;
628 current = current->next;
629 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
632 current = current->next;
637 /* LOCKING: requires that the GC lock is held */
639 sgen_client_clear_unreachable_ephemerons (ScanCopyContext ctx)
641 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
642 SgenGrayQueue *queue = ctx.queue;
643 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
644 Ephemeron *cur, *array_end;
648 MonoArray *array = current->array;
650 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
651 EphemeronLinkNode *tmp = current;
653 SGEN_LOG (5, "Dead Ephemeron array at %p", array);
656 prev->next = current->next;
658 ephemeron_list = current->next;
660 current = current->next;
661 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
666 copy_func ((GCObject**)&array, queue);
667 current->array = array;
669 SGEN_LOG (5, "Clearing unreachable entries for ephemeron array at %p", array);
671 cur = mono_array_addr (array, Ephemeron, 0);
672 array_end = cur + mono_array_length_fast (array);
673 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
675 for (; cur < array_end; ++cur) {
676 GCObject *key = cur->key;
678 if (!key || key == tombstone)
681 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
682 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
683 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
685 if (!sgen_is_object_alive_for_current_gen (key)) {
686 cur->key = tombstone;
692 current = current->next;
697 LOCKING: requires that the GC lock is held
699 Limitations: We scan all ephemerons on every collection since the current design doesn't allow for a simple nursery/mature split.
702 sgen_client_mark_ephemerons (ScanCopyContext ctx)
704 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
705 SgenGrayQueue *queue = ctx.queue;
706 gboolean nothing_marked = TRUE;
707 EphemeronLinkNode *current = ephemeron_list;
708 Ephemeron *cur, *array_end;
711 for (current = ephemeron_list; current; current = current->next) {
712 MonoArray *array = current->array;
713 SGEN_LOG (5, "Ephemeron array at %p", array);
715 /*It has to be alive*/
716 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
717 SGEN_LOG (5, "\tnot reachable");
721 copy_func ((GCObject**)&array, queue);
723 cur = mono_array_addr (array, Ephemeron, 0);
724 array_end = cur + mono_array_length_fast (array);
725 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
727 for (; cur < array_end; ++cur) {
728 GCObject *key = cur->key;
730 if (!key || key == tombstone)
733 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
734 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
735 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
737 if (sgen_is_object_alive_for_current_gen (key)) {
738 GCObject *value = cur->value;
740 copy_func (&cur->key, queue);
742 if (!sgen_is_object_alive_for_current_gen (value))
743 nothing_marked = FALSE;
744 copy_func (&cur->value, queue);
750 SGEN_LOG (5, "Ephemeron run finished. Is it done %d", nothing_marked);
751 return nothing_marked;
755 mono_gc_ephemeron_array_add (MonoObject *obj)
757 EphemeronLinkNode *node;
761 node = (EphemeronLinkNode *)sgen_alloc_internal (INTERNAL_MEM_EPHEMERON_LINK);
766 node->array = (MonoArray*)obj;
767 node->next = ephemeron_list;
768 ephemeron_list = node;
770 SGEN_LOG (5, "Registered ephemeron array %p", obj);
781 need_remove_object_for_domain (GCObject *start, MonoDomain *domain)
783 if (mono_object_domain (start) == domain) {
784 SGEN_LOG (4, "Need to cleanup object %p", start);
785 binary_protocol_cleanup (start, (gpointer)SGEN_LOAD_VTABLE (start), sgen_safe_object_get_size ((GCObject*)start));
792 process_object_for_domain_clearing (GCObject *start, MonoDomain *domain)
794 MonoVTable *vt = SGEN_LOAD_VTABLE (start);
795 if (vt->klass == mono_defaults.internal_thread_class)
796 g_assert (mono_object_domain (start) == mono_get_root_domain ());
797 /* The object could be a proxy for an object in the domain
799 #ifndef DISABLE_REMOTING
800 if (mono_defaults.real_proxy_class->supertypes && mono_class_has_parent_fast (vt->klass, mono_defaults.real_proxy_class)) {
801 MonoObject *server = ((MonoRealProxy*)start)->unwrapped_server;
803 /* The server could already have been zeroed out, so
804 we need to check for that, too. */
805 if (server && (!SGEN_LOAD_VTABLE (server) || mono_object_domain (server) == domain)) {
806 SGEN_LOG (4, "Cleaning up remote pointer in %p to object %p", start, server);
807 ((MonoRealProxy*)start)->unwrapped_server = NULL;
814 clear_domain_process_object (GCObject *obj, MonoDomain *domain)
818 process_object_for_domain_clearing (obj, domain);
819 remove = need_remove_object_for_domain (obj, domain);
821 if (remove && obj->synchronisation) {
822 guint32 dislink = mono_monitor_get_object_monitor_gchandle (obj);
824 mono_gchandle_free (dislink);
831 clear_domain_process_minor_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
833 if (clear_domain_process_object (obj, domain)) {
834 CANARIFY_SIZE (size);
835 memset (obj, 0, size);
840 clear_domain_process_major_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
842 clear_domain_process_object (obj, domain);
846 clear_domain_free_major_non_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
848 if (need_remove_object_for_domain (obj, domain))
849 major_collector.free_non_pinned_object (obj, size);
853 clear_domain_free_major_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
855 if (need_remove_object_for_domain (obj, domain))
856 major_collector.free_pinned_object (obj, size);
860 * When appdomains are unloaded we can easily remove objects that have finalizers,
861 * but all the others could still be present in random places on the heap.
862 * We need a sweep to get rid of them even though it's going to be costly
864 * The reason we need to remove them is because we access the vtable and class
865 * structures to know the object size and the reference bitmap: once the domain is
866 * unloaded the point to random memory.
869 mono_gc_clear_domain (MonoDomain * domain)
871 LOSObject *bigobj, *prev;
876 binary_protocol_domain_unload_begin (domain);
880 if (sgen_concurrent_collection_in_progress ())
881 sgen_perform_collection (0, GENERATION_OLD, "clear domain", TRUE, FALSE);
882 SGEN_ASSERT (0, !sgen_concurrent_collection_in_progress (), "We just ordered a synchronous collection. Why are we collecting concurrently?");
884 major_collector.finish_sweeping ();
886 sgen_process_fin_stage_entries ();
888 sgen_clear_nursery_fragments ();
890 if (sgen_mono_xdomain_checks && domain != mono_get_root_domain ()) {
891 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_NORMAL);
892 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_WBARRIER);
893 sgen_check_for_xdomain_refs ();
896 /*Ephemerons and dislinks must be processed before LOS since they might end up pointing
897 to memory returned to the OS.*/
898 null_ephemerons_for_domain (domain);
899 sgen_null_links_for_domain (domain);
901 for (i = GENERATION_NURSERY; i < GENERATION_MAX; ++i)
902 sgen_remove_finalizers_if (object_in_domain_predicate, domain, i);
904 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
905 (IterateObjectCallbackFunc)clear_domain_process_minor_object_callback, domain, FALSE, TRUE);
907 /* We need two passes over major and large objects because
908 freeing such objects might give their memory back to the OS
909 (in the case of large objects) or obliterate its vtable
910 (pinned objects with major-copying or pinned and non-pinned
911 objects with major-mark&sweep), but we might need to
912 dereference a pointer from an object to another object if
913 the first object is a proxy. */
914 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, (IterateObjectCallbackFunc)clear_domain_process_major_object_callback, domain);
915 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
916 clear_domain_process_object ((GCObject*)bigobj->data, domain);
919 for (bigobj = los_object_list; bigobj;) {
920 if (need_remove_object_for_domain ((GCObject*)bigobj->data, domain)) {
921 LOSObject *to_free = bigobj;
923 prev->next = bigobj->next;
925 los_object_list = bigobj->next;
926 bigobj = bigobj->next;
927 SGEN_LOG (4, "Freeing large object %p", bigobj->data);
928 sgen_los_free_object (to_free);
932 bigobj = bigobj->next;
934 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_NON_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_non_pinned_object_callback, domain);
935 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_pinned_object_callback, domain);
937 if (domain == mono_get_root_domain ()) {
938 sgen_pin_stats_report ();
939 sgen_object_layout_dump (stdout);
942 sgen_restart_world (0);
944 binary_protocol_domain_unload_end (domain);
945 binary_protocol_flush_buffers (FALSE);
955 mono_gc_alloc_obj (MonoVTable *vtable, size_t size)
957 MonoObject *obj = sgen_alloc_obj (vtable, size);
959 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
961 mono_profiler_allocation (obj);
968 mono_gc_alloc_pinned_obj (MonoVTable *vtable, size_t size)
970 MonoObject *obj = sgen_alloc_obj_pinned (vtable, size);
972 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
974 mono_profiler_allocation (obj);
981 mono_gc_alloc_mature (MonoVTable *vtable, size_t size)
983 MonoObject *obj = sgen_alloc_obj_mature (vtable, size);
985 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
987 mono_profiler_allocation (obj);
994 * mono_gc_alloc_fixed:
997 mono_gc_alloc_fixed (size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
999 /* FIXME: do a single allocation */
1000 void *res = g_calloc (1, size);
1003 if (!mono_gc_register_root ((char *)res, size, descr, source, msg)) {
1011 * mono_gc_free_fixed:
1014 mono_gc_free_fixed (void* addr)
1016 mono_gc_deregister_root ((char *)addr);
1024 static MonoMethod* alloc_method_cache [ATYPE_NUM];
1025 static MonoMethod* slowpath_alloc_method_cache [ATYPE_NUM];
1026 static gboolean use_managed_allocator = TRUE;
1028 #ifdef MANAGED_ALLOCATION
1029 // Cache the SgenThreadInfo pointer in a local 'var'.
1030 #define EMIT_TLS_ACCESS_VAR(mb, var) \
1032 var = mono_mb_add_local ((mb), &mono_defaults.int_class->byval_arg); \
1033 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1034 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1035 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1036 mono_mb_emit_stloc ((mb), (var)); \
1039 #define EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR(mb, var) \
1041 mono_mb_emit_ldloc ((mb), (var)); \
1042 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenClientThreadInfo, in_critical_region)); \
1043 mono_mb_emit_byte ((mb), CEE_ADD); \
1046 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb, var) do { \
1047 mono_mb_emit_ldloc ((mb), (var)); \
1048 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_next)); \
1049 mono_mb_emit_byte ((mb), CEE_ADD); \
1052 #define EMIT_TLS_ACCESS_TEMP_END(mb, var) do { \
1053 mono_mb_emit_ldloc ((mb), (var)); \
1054 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_temp_end)); \
1055 mono_mb_emit_byte ((mb), CEE_ADD); \
1056 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1059 /* FIXME: Do this in the JIT, where specialized allocation sequences can be created
1060 * for each class. This is currently not easy to do, as it is hard to generate basic
1061 * blocks + branches, but it is easy with the linear IL codebase.
1063 * For this to work we'd need to solve the TLAB race, first. Now we
1064 * require the allocator to be in a few known methods to make sure
1065 * that they are executed atomically via the restart mechanism.
1068 create_allocator (int atype, ManagedAllocatorVariant variant)
1070 int p_var, size_var, real_size_var, thread_var G_GNUC_UNUSED;
1071 gboolean slowpath = variant == MANAGED_ALLOCATOR_SLOW_PATH;
1072 guint32 fastpath_branch, max_size_branch, no_oom_branch;
1073 MonoMethodBuilder *mb;
1075 MonoMethodSignature *csig;
1076 static gboolean registered = FALSE;
1077 int tlab_next_addr_var, new_next_var;
1078 const char *name = NULL;
1083 mono_register_jit_icall (mono_gc_alloc_obj, "mono_gc_alloc_obj", mono_create_icall_signature ("object ptr int"), FALSE);
1084 mono_register_jit_icall (mono_gc_alloc_vector, "mono_gc_alloc_vector", mono_create_icall_signature ("object ptr int int"), FALSE);
1085 mono_register_jit_icall (mono_gc_alloc_string, "mono_gc_alloc_string", mono_create_icall_signature ("object ptr int int32"), FALSE);
1089 if (atype == ATYPE_SMALL) {
1090 name = slowpath ? "SlowAllocSmall" : "AllocSmall";
1091 } else if (atype == ATYPE_NORMAL) {
1092 name = slowpath ? "SlowAlloc" : "Alloc";
1093 } else if (atype == ATYPE_VECTOR) {
1094 name = slowpath ? "SlowAllocVector" : "AllocVector";
1095 } else if (atype == ATYPE_STRING) {
1096 name = slowpath ? "SlowAllocString" : "AllocString";
1098 g_assert_not_reached ();
1101 if (atype == ATYPE_NORMAL)
1106 csig = mono_metadata_signature_alloc (mono_defaults.corlib, num_params);
1107 if (atype == ATYPE_STRING) {
1108 csig->ret = &mono_defaults.string_class->byval_arg;
1109 csig->params [0] = &mono_defaults.int_class->byval_arg;
1110 csig->params [1] = &mono_defaults.int32_class->byval_arg;
1112 csig->ret = &mono_defaults.object_class->byval_arg;
1113 for (i = 0; i < num_params; i++)
1114 csig->params [i] = &mono_defaults.int_class->byval_arg;
1117 mb = mono_mb_new (mono_defaults.object_class, name, MONO_WRAPPER_ALLOC);
1124 mono_mb_emit_ldarg (mb, 0);
1125 mono_mb_emit_icall (mb, ves_icall_object_new_specific);
1128 mono_mb_emit_ldarg (mb, 0);
1129 mono_mb_emit_ldarg (mb, 1);
1130 mono_mb_emit_icall (mb, ves_icall_array_new_specific);
1133 mono_mb_emit_ldarg (mb, 1);
1134 mono_mb_emit_icall (mb, ves_icall_string_alloc);
1137 g_assert_not_reached ();
1144 * Tls access might call foreign code or code without jinfo. This can
1145 * only happen if we are outside of the critical region.
1147 EMIT_TLS_ACCESS_VAR (mb, thread_var);
1149 size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1150 if (atype == ATYPE_SMALL) {
1151 /* size_var = size_arg */
1152 mono_mb_emit_ldarg (mb, 1);
1153 mono_mb_emit_stloc (mb, size_var);
1154 } else if (atype == ATYPE_NORMAL) {
1155 /* size = vtable->klass->instance_size; */
1156 mono_mb_emit_ldarg (mb, 0);
1157 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1158 mono_mb_emit_byte (mb, CEE_ADD);
1159 mono_mb_emit_byte (mb, CEE_LDIND_I);
1160 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, instance_size));
1161 mono_mb_emit_byte (mb, CEE_ADD);
1162 /* FIXME: assert instance_size stays a 4 byte integer */
1163 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1164 mono_mb_emit_byte (mb, CEE_CONV_I);
1165 mono_mb_emit_stloc (mb, size_var);
1166 } else if (atype == ATYPE_VECTOR) {
1167 MonoExceptionClause *clause;
1168 int pos, pos_leave, pos_error;
1169 MonoClass *oom_exc_class;
1173 * n > MONO_ARRAY_MAX_INDEX => OutOfMemoryException
1174 * n < 0 => OverflowException
1176 * We can do an unsigned comparison to catch both cases, then in the error
1177 * case compare signed to distinguish between them.
1179 mono_mb_emit_ldarg (mb, 1);
1180 mono_mb_emit_icon (mb, MONO_ARRAY_MAX_INDEX);
1181 mono_mb_emit_byte (mb, CEE_CONV_U);
1182 pos = mono_mb_emit_short_branch (mb, CEE_BLE_UN_S);
1184 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1185 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1186 mono_mb_emit_ldarg (mb, 1);
1187 mono_mb_emit_icon (mb, 0);
1188 pos_error = mono_mb_emit_short_branch (mb, CEE_BLT_S);
1189 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1190 mono_mb_patch_short_branch (mb, pos_error);
1191 mono_mb_emit_exception (mb, "OverflowException", NULL);
1193 mono_mb_patch_short_branch (mb, pos);
1195 clause = (MonoExceptionClause *)mono_image_alloc0 (mono_defaults.corlib, sizeof (MonoExceptionClause));
1196 clause->try_offset = mono_mb_get_label (mb);
1198 /* vtable->klass->sizes.element_size */
1199 mono_mb_emit_ldarg (mb, 0);
1200 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1201 mono_mb_emit_byte (mb, CEE_ADD);
1202 mono_mb_emit_byte (mb, CEE_LDIND_I);
1203 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, sizes));
1204 mono_mb_emit_byte (mb, CEE_ADD);
1205 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1206 mono_mb_emit_byte (mb, CEE_CONV_I);
1209 mono_mb_emit_ldarg (mb, 1);
1210 mono_mb_emit_byte (mb, CEE_MUL_OVF_UN);
1211 /* + sizeof (MonoArray) */
1212 mono_mb_emit_icon (mb, MONO_SIZEOF_MONO_ARRAY);
1213 mono_mb_emit_byte (mb, CEE_ADD_OVF_UN);
1214 mono_mb_emit_stloc (mb, size_var);
1216 pos_leave = mono_mb_emit_branch (mb, CEE_LEAVE);
1219 clause->flags = MONO_EXCEPTION_CLAUSE_NONE;
1220 clause->try_len = mono_mb_get_pos (mb) - clause->try_offset;
1221 clause->data.catch_class = mono_class_load_from_name (mono_defaults.corlib,
1222 "System", "OverflowException");
1223 clause->handler_offset = mono_mb_get_label (mb);
1225 oom_exc_class = mono_class_load_from_name (mono_defaults.corlib,
1226 "System", "OutOfMemoryException");
1227 ctor = mono_class_get_method_from_name (oom_exc_class, ".ctor", 0);
1230 mono_mb_emit_byte (mb, CEE_POP);
1231 mono_mb_emit_op (mb, CEE_NEWOBJ, ctor);
1232 mono_mb_emit_byte (mb, CEE_THROW);
1234 clause->handler_len = mono_mb_get_pos (mb) - clause->handler_offset;
1235 mono_mb_set_clauses (mb, 1, clause);
1236 mono_mb_patch_branch (mb, pos_leave);
1238 } else if (atype == ATYPE_STRING) {
1242 * a string allocator method takes the args: (vtable, len)
1244 * bytes = offsetof (MonoString, chars) + ((len + 1) * 2)
1248 * bytes <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1252 * offsetof (MonoString, chars) + ((len + 1) * 2) <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1253 * len <= (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - offsetof (MonoString, chars)) / 2 - 1
1255 mono_mb_emit_ldarg (mb, 1);
1256 mono_mb_emit_icon (mb, (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - MONO_STRUCT_OFFSET (MonoString, chars)) / 2 - 1);
1257 pos = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
1259 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1260 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1261 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1262 mono_mb_patch_short_branch (mb, pos);
1264 mono_mb_emit_ldarg (mb, 1);
1265 mono_mb_emit_icon (mb, 1);
1266 mono_mb_emit_byte (mb, MONO_CEE_SHL);
1267 //WE manually fold the above + 2 here
1268 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, chars) + 2);
1269 mono_mb_emit_byte (mb, CEE_ADD);
1270 mono_mb_emit_stloc (mb, size_var);
1272 g_assert_not_reached ();
1275 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1276 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1277 mono_mb_emit_byte (mb, CEE_LDC_I4_1);
1278 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1279 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1280 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_NONE);
1283 if (nursery_canaries_enabled ()) {
1284 real_size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1285 mono_mb_emit_ldloc (mb, size_var);
1286 mono_mb_emit_stloc(mb, real_size_var);
1289 real_size_var = size_var;
1291 /* size += ALLOC_ALIGN - 1; */
1292 mono_mb_emit_ldloc (mb, size_var);
1293 mono_mb_emit_icon (mb, SGEN_ALLOC_ALIGN - 1);
1294 mono_mb_emit_byte (mb, CEE_ADD);
1295 /* size &= ~(ALLOC_ALIGN - 1); */
1296 mono_mb_emit_icon (mb, ~(SGEN_ALLOC_ALIGN - 1));
1297 mono_mb_emit_byte (mb, CEE_AND);
1298 mono_mb_emit_stloc (mb, size_var);
1300 /* if (size > MAX_SMALL_OBJ_SIZE) goto slowpath */
1301 if (atype != ATYPE_SMALL) {
1302 mono_mb_emit_ldloc (mb, size_var);
1303 mono_mb_emit_icon (mb, SGEN_MAX_SMALL_OBJ_SIZE);
1304 max_size_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
1308 * We need to modify tlab_next, but the JIT only supports reading, so we read
1309 * another tls var holding its address instead.
1312 /* tlab_next_addr (local) = tlab_next_addr (TLS var) */
1313 tlab_next_addr_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1314 EMIT_TLS_ACCESS_NEXT_ADDR (mb, thread_var);
1315 mono_mb_emit_stloc (mb, tlab_next_addr_var);
1317 /* p = (void**)tlab_next; */
1318 p_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1319 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1320 mono_mb_emit_byte (mb, CEE_LDIND_I);
1321 mono_mb_emit_stloc (mb, p_var);
1323 /* new_next = (char*)p + size; */
1324 new_next_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1325 mono_mb_emit_ldloc (mb, p_var);
1326 mono_mb_emit_ldloc (mb, size_var);
1327 mono_mb_emit_byte (mb, CEE_CONV_I);
1328 mono_mb_emit_byte (mb, CEE_ADD);
1330 if (nursery_canaries_enabled ()) {
1331 mono_mb_emit_icon (mb, CANARY_SIZE);
1332 mono_mb_emit_byte (mb, CEE_ADD);
1334 mono_mb_emit_stloc (mb, new_next_var);
1336 /* if (G_LIKELY (new_next < tlab_temp_end)) */
1337 mono_mb_emit_ldloc (mb, new_next_var);
1338 EMIT_TLS_ACCESS_TEMP_END (mb, thread_var);
1339 fastpath_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
1342 if (atype != ATYPE_SMALL)
1343 mono_mb_patch_short_branch (mb, max_size_branch);
1345 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1346 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1348 * We are no longer in a critical section. We need to do this before calling
1349 * to unmanaged land in order to avoid stw deadlocks since unmanaged code
1352 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1353 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1354 mono_mb_emit_byte (mb, CEE_LDC_I4_0);
1355 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1356 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1357 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_NONE);
1360 /* FIXME: mono_gc_alloc_obj takes a 'size_t' as an argument, not an int32 */
1361 mono_mb_emit_ldarg (mb, 0);
1362 mono_mb_emit_ldloc (mb, real_size_var);
1363 if (atype == ATYPE_NORMAL || atype == ATYPE_SMALL) {
1364 mono_mb_emit_icall (mb, mono_gc_alloc_obj);
1365 } else if (atype == ATYPE_VECTOR) {
1366 mono_mb_emit_ldarg (mb, 1);
1367 mono_mb_emit_icall (mb, mono_gc_alloc_vector);
1368 } else if (atype == ATYPE_STRING) {
1369 mono_mb_emit_ldarg (mb, 1);
1370 mono_mb_emit_icall (mb, mono_gc_alloc_string);
1372 g_assert_not_reached ();
1375 /* if (ret == NULL) throw OOM; */
1376 mono_mb_emit_byte (mb, CEE_DUP);
1377 no_oom_branch = mono_mb_emit_branch (mb, CEE_BRTRUE);
1378 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1380 mono_mb_patch_branch (mb, no_oom_branch);
1381 mono_mb_emit_byte (mb, CEE_RET);
1384 mono_mb_patch_short_branch (mb, fastpath_branch);
1386 /* FIXME: Memory barrier */
1388 /* tlab_next = new_next */
1389 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1390 mono_mb_emit_ldloc (mb, new_next_var);
1391 mono_mb_emit_byte (mb, CEE_STIND_I);
1394 mono_mb_emit_ldloc (mb, p_var);
1395 mono_mb_emit_ldarg (mb, 0);
1396 mono_mb_emit_byte (mb, CEE_STIND_I);
1398 /* mark object end with nursery word */
1399 if (nursery_canaries_enabled ()) {
1400 mono_mb_emit_ldloc (mb, p_var);
1401 mono_mb_emit_ldloc (mb, real_size_var);
1402 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1403 mono_mb_emit_icon8 (mb, (mword) CANARY_STRING);
1404 mono_mb_emit_icon (mb, CANARY_SIZE);
1405 mono_mb_emit_byte (mb, MONO_CEE_PREFIX1);
1406 mono_mb_emit_byte (mb, CEE_CPBLK);
1409 if (atype == ATYPE_VECTOR) {
1410 /* arr->max_length = max_length; */
1411 mono_mb_emit_ldloc (mb, p_var);
1412 mono_mb_emit_ldflda (mb, MONO_STRUCT_OFFSET (MonoArray, max_length));
1413 mono_mb_emit_ldarg (mb, 1);
1414 #ifdef MONO_BIG_ARRAYS
1415 mono_mb_emit_byte (mb, CEE_STIND_I);
1417 mono_mb_emit_byte (mb, CEE_STIND_I4);
1419 } else if (atype == ATYPE_STRING) {
1420 /* need to set length and clear the last char */
1421 /* s->length = len; */
1422 mono_mb_emit_ldloc (mb, p_var);
1423 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, length));
1424 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1425 mono_mb_emit_ldarg (mb, 1);
1426 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
1429 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1430 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1431 mono_mb_emit_byte (mb, CEE_LDC_I4_0);
1432 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1433 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1435 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1436 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1439 We must make sure both vtable and max_length are globaly visible before returning to managed land.
1441 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1444 mono_mb_emit_ldloc (mb, p_var);
1447 mono_mb_emit_byte (mb, CEE_RET);
1450 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
1451 info->d.alloc.gc_name = "sgen";
1452 info->d.alloc.alloc_type = atype;
1455 mb->init_locals = FALSE;
1458 res = mono_mb_create (mb, csig, 8, info);
1467 mono_gc_get_aligned_size_for_allocator (int size)
1469 return SGEN_ALIGN_UP (size);
1473 * Generate an allocator method implementing the fast path of mono_gc_alloc_obj ().
1474 * The signature of the called method is:
1475 * object allocate (MonoVTable *vtable)
1478 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box, gboolean known_instance_size)
1480 #ifdef MANAGED_ALLOCATION
1481 if (collect_before_allocs)
1483 if (klass->instance_size > tlab_size)
1485 if (known_instance_size && ALIGN_TO (klass->instance_size, SGEN_ALLOC_ALIGN) >= SGEN_MAX_SMALL_OBJ_SIZE)
1487 if (mono_class_has_finalizer (klass) || mono_class_is_marshalbyref (klass))
1491 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1493 if (klass->byval_arg.type == MONO_TYPE_STRING)
1494 return mono_gc_get_managed_allocator_by_type (ATYPE_STRING, MANAGED_ALLOCATOR_REGULAR);
1495 /* Generic classes have dynamic field and can go above MAX_SMALL_OBJ_SIZE. */
1496 if (known_instance_size)
1497 return mono_gc_get_managed_allocator_by_type (ATYPE_SMALL, MANAGED_ALLOCATOR_REGULAR);
1499 return mono_gc_get_managed_allocator_by_type (ATYPE_NORMAL, MANAGED_ALLOCATOR_REGULAR);
1506 mono_gc_get_managed_array_allocator (MonoClass *klass)
1508 #ifdef MANAGED_ALLOCATION
1509 if (klass->rank != 1)
1511 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1513 if (has_per_allocation_action)
1515 g_assert (!mono_class_has_finalizer (klass) && !mono_class_is_marshalbyref (klass));
1517 return mono_gc_get_managed_allocator_by_type (ATYPE_VECTOR, MANAGED_ALLOCATOR_REGULAR);
1524 sgen_set_use_managed_allocator (gboolean flag)
1526 use_managed_allocator = flag;
1530 mono_gc_get_managed_allocator_by_type (int atype, ManagedAllocatorVariant variant)
1532 #ifdef MANAGED_ALLOCATION
1536 if (variant == MANAGED_ALLOCATOR_REGULAR && !use_managed_allocator)
1540 case MANAGED_ALLOCATOR_REGULAR: cache = alloc_method_cache; break;
1541 case MANAGED_ALLOCATOR_SLOW_PATH: cache = slowpath_alloc_method_cache; break;
1542 default: g_assert_not_reached (); break;
1545 res = cache [atype];
1549 res = create_allocator (atype, variant);
1551 if (cache [atype]) {
1552 mono_free_method (res);
1553 res = cache [atype];
1555 mono_memory_barrier ();
1556 cache [atype] = res;
1567 mono_gc_get_managed_allocator_types (void)
1573 sgen_is_managed_allocator (MonoMethod *method)
1577 for (i = 0; i < ATYPE_NUM; ++i)
1578 if (method == alloc_method_cache [i] || method == slowpath_alloc_method_cache [i])
1584 sgen_has_managed_allocator (void)
1588 for (i = 0; i < ATYPE_NUM; ++i)
1589 if (alloc_method_cache [i] || slowpath_alloc_method_cache [i])
1594 #define ARRAY_OBJ_INDEX(ptr,array,elem_size) (((char*)(ptr) - ((char*)(array) + G_STRUCT_OFFSET (MonoArray, vector))) / (elem_size))
1597 sgen_client_cardtable_scan_object (GCObject *obj, guint8 *cards, ScanCopyContext ctx)
1599 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
1600 MonoClass *klass = vt->klass;
1602 SGEN_ASSERT (0, SGEN_VTABLE_HAS_REFERENCES (vt), "Why would we ever call this on reference-free objects?");
1605 MonoArray *arr = (MonoArray*)obj;
1606 guint8 *card_data, *card_base;
1607 guint8 *card_data_end;
1608 char *obj_start = (char *)sgen_card_table_align_pointer (obj);
1610 mword obj_size = sgen_mono_array_size (vt, arr, &bounds_size, sgen_vtable_get_descriptor (vt));
1611 /* We don't want to scan the bounds entries at the end of multidimensional arrays */
1612 char *obj_end = (char*)obj + obj_size - bounds_size;
1614 size_t extra_idx = 0;
1616 mword desc = (mword)klass->element_class->gc_descr;
1617 int elem_size = mono_array_element_size (klass);
1619 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1620 guint8 *overflow_scan_end = NULL;
1623 #ifdef SGEN_OBJECT_LAYOUT_STATISTICS
1624 if (klass->element_class->valuetype)
1625 sgen_object_layout_scanned_vtype_array ();
1627 sgen_object_layout_scanned_ref_array ();
1633 card_data = sgen_card_table_get_card_scan_address ((mword)obj);
1635 card_base = card_data;
1636 card_count = sgen_card_table_number_of_cards_in_range ((mword)obj, obj_size);
1637 card_data_end = card_data + card_count;
1640 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1641 /*Check for overflow and if so, setup to scan in two steps*/
1642 if (!cards && card_data_end >= SGEN_SHADOW_CARDTABLE_END) {
1643 overflow_scan_end = sgen_shadow_cardtable + (card_data_end - SGEN_SHADOW_CARDTABLE_END);
1644 card_data_end = SGEN_SHADOW_CARDTABLE_END;
1650 card_data = sgen_find_next_card (card_data, card_data_end);
1651 for (; card_data < card_data_end; card_data = sgen_find_next_card (card_data + 1, card_data_end)) {
1653 size_t idx = (card_data - card_base) + extra_idx;
1654 char *start = (char*)(obj_start + idx * CARD_SIZE_IN_BYTES);
1655 char *card_end = start + CARD_SIZE_IN_BYTES;
1656 char *first_elem, *elem;
1658 HEAVY_STAT (++los_marked_cards);
1661 sgen_card_table_prepare_card_for_scanning (card_data);
1663 card_end = MIN (card_end, obj_end);
1665 if (start <= (char*)arr->vector)
1668 index = ARRAY_OBJ_INDEX (start, obj, elem_size);
1670 elem = first_elem = (char*)mono_array_addr_with_size_fast ((MonoArray*)obj, elem_size, index);
1671 if (klass->element_class->valuetype) {
1672 ScanVTypeFunc scan_vtype_func = ctx.ops->scan_vtype;
1674 for (; elem < card_end; elem += elem_size)
1675 scan_vtype_func (obj, elem, desc, ctx.queue BINARY_PROTOCOL_ARG (elem_size));
1677 ScanPtrFieldFunc scan_ptr_field_func = ctx.ops->scan_ptr_field;
1679 HEAVY_STAT (++los_array_cards);
1680 for (; elem < card_end; elem += SIZEOF_VOID_P)
1681 scan_ptr_field_func (obj, (GCObject**)elem, ctx.queue);
1684 binary_protocol_card_scan (first_elem, elem - first_elem);
1687 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1688 if (overflow_scan_end) {
1689 extra_idx = card_data - card_base;
1690 card_base = card_data = sgen_shadow_cardtable;
1691 card_data_end = overflow_scan_end;
1692 overflow_scan_end = NULL;
1703 * Array and string allocation
1707 mono_gc_alloc_vector (MonoVTable *vtable, size_t size, uintptr_t max_length)
1712 if (!SGEN_CAN_ALIGN_UP (size))
1715 #ifndef DISABLE_CRITICAL_REGION
1716 ENTER_CRITICAL_REGION;
1717 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1719 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1720 arr->max_length = (mono_array_size_t)max_length;
1721 EXIT_CRITICAL_REGION;
1724 EXIT_CRITICAL_REGION;
1729 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1730 if (G_UNLIKELY (!arr)) {
1735 arr->max_length = (mono_array_size_t)max_length;
1740 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1741 mono_profiler_allocation (&arr->obj);
1743 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Vector has incorrect size.");
1748 mono_gc_alloc_array (MonoVTable *vtable, size_t size, uintptr_t max_length, uintptr_t bounds_size)
1751 MonoArrayBounds *bounds;
1754 if (!SGEN_CAN_ALIGN_UP (size))
1757 #ifndef DISABLE_CRITICAL_REGION
1758 ENTER_CRITICAL_REGION;
1759 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1761 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1762 arr->max_length = (mono_array_size_t)max_length;
1764 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1765 arr->bounds = bounds;
1766 EXIT_CRITICAL_REGION;
1769 EXIT_CRITICAL_REGION;
1774 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1775 if (G_UNLIKELY (!arr)) {
1780 arr->max_length = (mono_array_size_t)max_length;
1782 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1783 arr->bounds = bounds;
1788 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1789 mono_profiler_allocation (&arr->obj);
1791 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Array has incorrect size.");
1796 mono_gc_alloc_string (MonoVTable *vtable, size_t size, gint32 len)
1801 if (!SGEN_CAN_ALIGN_UP (size))
1804 #ifndef DISABLE_CRITICAL_REGION
1805 ENTER_CRITICAL_REGION;
1806 str = (MonoString*)sgen_try_alloc_obj_nolock (vtable, size);
1808 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1810 EXIT_CRITICAL_REGION;
1813 EXIT_CRITICAL_REGION;
1818 str = (MonoString*)sgen_alloc_obj_nolock (vtable, size);
1819 if (G_UNLIKELY (!str)) {
1829 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1830 mono_profiler_allocation (&str->object);
1840 mono_gc_set_string_length (MonoString *str, gint32 new_length)
1842 mono_unichar2 *new_end = str->chars + new_length;
1844 /* zero the discarded string. This null-delimits the string and allows
1845 * the space to be reclaimed by SGen. */
1847 if (nursery_canaries_enabled () && sgen_ptr_in_nursery (str)) {
1848 CHECK_CANARY_FOR_OBJECT ((GCObject*)str, TRUE);
1849 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2) + CANARY_SIZE);
1850 memcpy (new_end + 1 , CANARY_STRING, CANARY_SIZE);
1852 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2));
1855 str->length = new_length;
1862 #define GC_ROOT_NUM 32
1864 int count; /* must be the first field */
1865 void *objects [GC_ROOT_NUM];
1866 int root_types [GC_ROOT_NUM];
1867 uintptr_t extra_info [GC_ROOT_NUM];
1871 notify_gc_roots (GCRootReport *report)
1875 mono_profiler_gc_roots (report->count, report->objects, report->root_types, report->extra_info);
1880 add_profile_gc_root (GCRootReport *report, void *object, int rtype, uintptr_t extra_info)
1882 if (report->count == GC_ROOT_NUM)
1883 notify_gc_roots (report);
1884 report->objects [report->count] = object;
1885 report->root_types [report->count] = rtype;
1886 report->extra_info [report->count++] = (uintptr_t)SGEN_LOAD_VTABLE (object)->klass;
1890 sgen_client_nursery_objects_pinned (void **definitely_pinned, int count)
1892 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS) {
1893 GCRootReport report;
1896 for (idx = 0; idx < count; ++idx)
1897 add_profile_gc_root (&report, definitely_pinned [idx], MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
1898 notify_gc_roots (&report);
1903 report_finalizer_roots_from_queue (SgenPointerQueue *queue)
1905 GCRootReport report;
1909 for (i = 0; i < queue->next_slot; ++i) {
1910 void *obj = queue->data [i];
1913 add_profile_gc_root (&report, obj, MONO_PROFILE_GC_ROOT_FINALIZER, 0);
1915 notify_gc_roots (&report);
1919 report_finalizer_roots (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
1921 report_finalizer_roots_from_queue (fin_ready_queue);
1922 report_finalizer_roots_from_queue (critical_fin_queue);
1925 static GCRootReport *root_report;
1928 single_arg_report_root (MonoObject **obj, void *gc_data)
1931 add_profile_gc_root (root_report, *obj, MONO_PROFILE_GC_ROOT_OTHER, 0);
1935 precisely_report_roots_from (GCRootReport *report, void** start_root, void** end_root, mword desc)
1937 switch (desc & ROOT_DESC_TYPE_MASK) {
1938 case ROOT_DESC_BITMAP:
1939 desc >>= ROOT_DESC_TYPE_SHIFT;
1941 if ((desc & 1) && *start_root) {
1942 add_profile_gc_root (report, *start_root, MONO_PROFILE_GC_ROOT_OTHER, 0);
1948 case ROOT_DESC_COMPLEX: {
1949 gsize *bitmap_data = (gsize *)sgen_get_complex_descriptor_bitmap (desc);
1950 gsize bwords = (*bitmap_data) - 1;
1951 void **start_run = start_root;
1953 while (bwords-- > 0) {
1954 gsize bmap = *bitmap_data++;
1955 void **objptr = start_run;
1957 if ((bmap & 1) && *objptr) {
1958 add_profile_gc_root (report, *objptr, MONO_PROFILE_GC_ROOT_OTHER, 0);
1963 start_run += GC_BITS_PER_WORD;
1967 case ROOT_DESC_VECTOR: {
1970 for (p = start_root; p < end_root; p++) {
1972 add_profile_gc_root (report, *p, MONO_PROFILE_GC_ROOT_OTHER, 0);
1976 case ROOT_DESC_USER: {
1977 MonoGCRootMarkFunc marker = (MonoGCRootMarkFunc)sgen_get_user_descriptor_func (desc);
1978 root_report = report;
1979 marker ((MonoObject**)start_root, single_arg_report_root, NULL);
1982 case ROOT_DESC_RUN_LEN:
1983 g_assert_not_reached ();
1985 g_assert_not_reached ();
1990 report_registered_roots_by_type (int root_type)
1992 GCRootReport report;
1996 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], void **, start_root, RootRecord *, root) {
1997 SGEN_LOG (6, "Precise root scan %p-%p (desc: %p)", start_root, root->end_root, (void*)root->root_desc);
1998 precisely_report_roots_from (&report, start_root, (void**)root->end_root, root->root_desc);
1999 } SGEN_HASH_TABLE_FOREACH_END;
2000 notify_gc_roots (&report);
2004 report_registered_roots (void)
2006 report_registered_roots_by_type (ROOT_TYPE_NORMAL);
2007 report_registered_roots_by_type (ROOT_TYPE_WBARRIER);
2011 sgen_client_collecting_minor (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2013 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2014 report_registered_roots ();
2015 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2016 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2019 static GCRootReport major_root_report;
2020 static gboolean profile_roots;
2023 sgen_client_collecting_major_1 (void)
2025 profile_roots = mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS;
2026 memset (&major_root_report, 0, sizeof (GCRootReport));
2030 sgen_client_pinned_los_object (GCObject *obj)
2033 add_profile_gc_root (&major_root_report, (char*)obj, MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
2037 sgen_client_collecting_major_2 (void)
2040 notify_gc_roots (&major_root_report);
2042 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2043 report_registered_roots ();
2047 sgen_client_collecting_major_3 (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2049 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2050 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2053 #define MOVED_OBJECTS_NUM 64
2054 static void *moved_objects [MOVED_OBJECTS_NUM];
2055 static int moved_objects_idx = 0;
2057 static SgenPointerQueue moved_objects_queue = SGEN_POINTER_QUEUE_INIT (INTERNAL_MEM_MOVED_OBJECT);
2060 mono_sgen_register_moved_object (void *obj, void *destination)
2063 * This function can be called from SGen's worker threads. We want to try
2064 * and avoid exposing those threads to the profiler API, so queue up move
2065 * events and send them later when the main GC thread calls
2066 * mono_sgen_gc_event_moves ().
2068 * TODO: Once SGen has multiple worker threads, we need to switch to a
2069 * lock-free data structure for the queue as multiple threads will be
2070 * adding to it at the same time.
2072 if (sgen_workers_is_worker_thread (mono_native_thread_id_get ())) {
2073 sgen_pointer_queue_add (&moved_objects_queue, obj);
2074 sgen_pointer_queue_add (&moved_objects_queue, destination);
2076 if (moved_objects_idx == MOVED_OBJECTS_NUM) {
2077 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2078 moved_objects_idx = 0;
2081 moved_objects [moved_objects_idx++] = obj;
2082 moved_objects [moved_objects_idx++] = destination;
2087 mono_sgen_gc_event_moves (void)
2089 while (!sgen_pointer_queue_is_empty (&moved_objects_queue)) {
2090 void *dst = sgen_pointer_queue_pop (&moved_objects_queue);
2091 void *src = sgen_pointer_queue_pop (&moved_objects_queue);
2093 mono_sgen_register_moved_object (src, dst);
2096 if (moved_objects_idx) {
2097 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2098 moved_objects_idx = 0;
2106 #define REFS_SIZE 128
2109 MonoGCReferences callback;
2113 MonoObject *refs [REFS_SIZE];
2114 uintptr_t offsets [REFS_SIZE];
2118 #define HANDLE_PTR(ptr,obj) do { \
2120 if (hwi->count == REFS_SIZE) { \
2121 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data); \
2125 hwi->offsets [hwi->count] = (char*)(ptr)-(char*)start; \
2126 hwi->refs [hwi->count++] = *(ptr); \
2131 collect_references (HeapWalkInfo *hwi, GCObject *obj, size_t size)
2133 char *start = (char*)obj;
2134 mword desc = sgen_obj_get_descriptor (obj);
2136 #include "sgen/sgen-scan-object.h"
2140 walk_references (GCObject *start, size_t size, void *data)
2142 HeapWalkInfo *hwi = (HeapWalkInfo *)data;
2145 collect_references (hwi, start, size);
2146 if (hwi->count || !hwi->called)
2147 hwi->callback (start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data);
2151 * mono_gc_walk_heap:
2152 * \param flags flags for future use
2153 * \param callback a function pointer called for each object in the heap
2154 * \param data a user data pointer that is passed to callback
2155 * This function can be used to iterate over all the live objects in the heap;
2156 * for each object, \p callback is invoked, providing info about the object's
2157 * location in memory, its class, its size and the objects it references.
2158 * For each referenced object its offset from the object address is
2159 * reported in the offsets array.
2160 * The object references may be buffered, so the callback may be invoked
2161 * multiple times for the same object: in all but the first call, the size
2162 * argument will be zero.
2163 * Note that this function can be only called in the \c MONO_GC_EVENT_PRE_START_WORLD
2164 * profiler event handler.
2165 * \returns a non-zero value if the GC doesn't support heap walking
2168 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
2173 hwi.callback = callback;
2176 sgen_clear_nursery_fragments ();
2177 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data, walk_references, &hwi, FALSE, TRUE);
2179 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, walk_references, &hwi);
2180 sgen_los_iterate_objects (walk_references, &hwi);
2190 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
2192 gc_callbacks = *callbacks;
2196 mono_gc_get_gc_callbacks ()
2198 return &gc_callbacks;
2202 sgen_client_thread_register (SgenThreadInfo* info, void *stack_bottom_fallback)
2205 guint8 *staddr = NULL;
2207 mono_tls_set_sgen_thread_info (info);
2209 info->client_info.skip = 0;
2211 info->client_info.stack_start = NULL;
2213 #ifdef SGEN_POSIX_STW
2214 info->client_info.stop_count = -1;
2215 info->client_info.signal = 0;
2218 mono_thread_info_get_stack_bounds (&staddr, &stsize);
2220 info->client_info.stack_start_limit = staddr;
2221 info->client_info.stack_end = staddr + stsize;
2223 gsize stack_bottom = (gsize)stack_bottom_fallback;
2224 stack_bottom += 4095;
2225 stack_bottom &= ~4095;
2226 info->client_info.stack_end = (char*)stack_bottom;
2229 memset (&info->client_info.ctx, 0, sizeof (MonoContext));
2231 if (mono_gc_get_gc_callbacks ()->thread_attach_func)
2232 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2234 binary_protocol_thread_register ((gpointer)mono_thread_info_get_tid (info));
2236 SGEN_LOG (3, "registered thread %p (%p) stack end %p", info, (gpointer)mono_thread_info_get_tid (info), info->client_info.stack_end);
2238 info->client_info.info.handle_stack = mono_handle_stack_alloc ();
2242 sgen_client_thread_unregister (SgenThreadInfo *p)
2244 MonoNativeThreadId tid;
2246 mono_tls_set_sgen_thread_info (NULL);
2248 tid = mono_thread_info_get_tid (p);
2250 if (p->client_info.info.runtime_thread)
2251 mono_threads_add_joinable_thread ((gpointer)tid);
2253 if (mono_gc_get_gc_callbacks ()->thread_detach_func) {
2254 mono_gc_get_gc_callbacks ()->thread_detach_func (p->client_info.runtime_data);
2255 p->client_info.runtime_data = NULL;
2258 binary_protocol_thread_unregister ((gpointer)tid);
2259 SGEN_LOG (3, "unregister thread %p (%p)", p, (gpointer)tid);
2261 HandleStack *handles = (HandleStack*) p->client_info.info.handle_stack;
2262 p->client_info.info.handle_stack = NULL;
2263 mono_handle_stack_free (handles);
2267 mono_gc_set_skip_thread (gboolean skip)
2269 SgenThreadInfo *info = mono_thread_info_current ();
2272 info->client_info.gc_disabled = skip;
2276 /* If we skip scanning a thread with a non-empty handle stack, we may move an
2277 * object but fail to update the reference in the handle.
2279 HandleStack *stack = info->client_info.info.handle_stack;
2280 g_assert (stack == NULL || mono_handle_stack_is_empty (stack));
2285 thread_in_critical_region (SgenThreadInfo *info)
2287 return info->client_info.in_critical_region;
2291 sgen_thread_attach (SgenThreadInfo *info)
2293 if (mono_gc_get_gc_callbacks ()->thread_attach_func && !info->client_info.runtime_data)
2294 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2298 sgen_thread_detach (SgenThreadInfo *p)
2300 /* If a delegate is passed to native code and invoked on a thread we dont
2301 * know about, marshal will register it with mono_threads_attach_coop, but
2302 * we have no way of knowing when that thread goes away. SGen has a TSD
2303 * so we assume that if the domain is still registered, we can detach
2306 if (mono_thread_internal_current_is_attached ())
2307 mono_thread_detach_internal (mono_thread_internal_current ());
2311 * mono_gc_register_thread:
2314 mono_gc_register_thread (void *baseptr)
2316 return mono_thread_info_attach (baseptr) != NULL;
2320 * mono_gc_is_gc_thread:
2323 mono_gc_is_gc_thread (void)
2327 result = mono_thread_info_current () != NULL;
2333 sgen_client_thread_register_worker (void)
2335 mono_thread_info_register_small_id ();
2336 mono_native_thread_set_name (mono_native_thread_id_get (), "SGen worker");
2339 /* Variables holding start/end nursery so it won't have to be passed at every call */
2340 static void *scan_area_arg_start, *scan_area_arg_end;
2343 mono_gc_conservatively_scan_area (void *start, void *end)
2345 sgen_conservatively_pin_objects_from ((void **)start, (void **)end, scan_area_arg_start, scan_area_arg_end, PIN_TYPE_STACK);
2349 mono_gc_scan_object (void *obj, void *gc_data)
2351 ScanCopyContext *ctx = (ScanCopyContext *)gc_data;
2352 ctx->ops->copy_or_mark_object ((GCObject**)&obj, ctx->queue);
2357 void **start_nursery;
2359 } PinHandleStackInteriorPtrData;
2361 /* Called when we're scanning the handle stack imprecisely and we encounter a pointer into the
2362 middle of an object.
2365 pin_handle_stack_interior_ptrs (void **ptr_slot, void *user_data)
2367 PinHandleStackInteriorPtrData *ud = (PinHandleStackInteriorPtrData *)user_data;
2368 sgen_conservatively_pin_objects_from (ptr_slot, ptr_slot+1, ud->start_nursery, ud->end_nursery, PIN_TYPE_STACK);
2373 * Mark from thread stacks and registers.
2376 sgen_client_scan_thread_data (void *start_nursery, void *end_nursery, gboolean precise, ScanCopyContext ctx)
2378 scan_area_arg_start = start_nursery;
2379 scan_area_arg_end = end_nursery;
2381 FOREACH_THREAD (info) {
2382 int skip_reason = 0;
2383 void *aligned_stack_start;
2385 if (info->client_info.skip) {
2386 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);
2388 } else if (info->client_info.gc_disabled) {
2389 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);
2391 } else if (!mono_thread_info_is_live (info)) {
2392 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);
2394 } else if (!info->client_info.stack_start) {
2395 SGEN_LOG (3, "Skipping starting or detaching thread %p", info);
2399 binary_protocol_scan_stack ((gpointer)mono_thread_info_get_tid (info), info->client_info.stack_start, info->client_info.stack_end, skip_reason);
2403 /* If we skip a thread with a non-empty handle stack and then it
2404 * resumes running we may potentially move an object but fail to
2405 * update the reference in the handle.
2407 HandleStack *stack = info->client_info.info.handle_stack;
2408 g_assert (stack == NULL || mono_handle_stack_is_empty (stack));
2413 g_assert (info->client_info.stack_start);
2414 g_assert (info->client_info.stack_end);
2416 aligned_stack_start = (void*)(mword) ALIGN_TO ((mword)info->client_info.stack_start, SIZEOF_VOID_P);
2418 /* Windows uses a guard page before the committed stack memory pages to detect when the
2419 stack needs to be grown. If we suspend a thread just after a function prolog has
2420 decremented the stack pointer to point into the guard page but before the thread has
2421 been able to read or write to that page, starting the stack scan at aligned_stack_start
2422 will raise a STATUS_GUARD_PAGE_VIOLATION and the process will crash. This code uses
2423 VirtualQuery() to determine whether stack_start points into the guard page and then
2424 updates aligned_stack_start to point at the next non-guard page. */
2425 MEMORY_BASIC_INFORMATION mem_info;
2426 SIZE_T result = VirtualQuery(info->client_info.stack_start, &mem_info, sizeof(mem_info));
2427 g_assert (result != 0);
2428 if (mem_info.Protect & PAGE_GUARD) {
2429 aligned_stack_start = ((char*) mem_info.BaseAddress) + mem_info.RegionSize;
2433 g_assert (info->client_info.suspend_done);
2434 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 ());
2435 if (mono_gc_get_gc_callbacks ()->thread_mark_func && !conservative_stack_mark) {
2436 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);
2437 } else if (!precise) {
2438 if (!conservative_stack_mark) {
2439 fprintf (stderr, "Precise stack mark not supported - disabling.\n");
2440 conservative_stack_mark = TRUE;
2442 //FIXME we should eventually use the new stack_mark from coop
2443 sgen_conservatively_pin_objects_from ((void **)aligned_stack_start, (void **)info->client_info.stack_end, start_nursery, end_nursery, PIN_TYPE_STACK);
2447 sgen_conservatively_pin_objects_from ((void**)&info->client_info.ctx, (void**)(&info->client_info.ctx + 1),
2448 start_nursery, end_nursery, PIN_TYPE_STACK);
2451 // This is used on Coop GC for platforms where we cannot get the data for individual registers.
2452 // We force a spill of all registers into the stack and pass a chunk of data into sgen.
2453 //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
2454 MonoThreadUnwindState *state = &info->client_info.info.thread_saved_state [SELF_SUSPEND_STATE_INDEX];
2455 if (state && state->gc_stackdata) {
2456 sgen_conservatively_pin_objects_from ((void **)state->gc_stackdata, (void**)((char*)state->gc_stackdata + state->gc_stackdata_size),
2457 start_nursery, end_nursery, PIN_TYPE_STACK);
2461 if (info->client_info.info.handle_stack) {
2463 Make two passes over the handle stack. On the imprecise pass, pin all
2464 objects where the handle points into the interior of the object. On the
2465 precise pass, copy or mark all the objects that have handles to the
2466 beginning of the object.
2469 mono_handle_stack_scan ((HandleStack*)info->client_info.info.handle_stack, (GcScanFunc)ctx.ops->copy_or_mark_object, ctx.queue, precise);
2471 PinHandleStackInteriorPtrData ud = { .start_nursery = start_nursery,
2472 .end_nursery = end_nursery,
2474 mono_handle_stack_scan ((HandleStack*)info->client_info.info.handle_stack, pin_handle_stack_interior_ptrs, &ud, precise);
2477 } FOREACH_THREAD_END
2481 * mono_gc_set_stack_end:
2483 * Set the end of the current threads stack to STACK_END. The stack space between
2484 * STACK_END and the real end of the threads stack will not be scanned during collections.
2487 mono_gc_set_stack_end (void *stack_end)
2489 SgenThreadInfo *info;
2492 info = mono_thread_info_current ();
2494 SGEN_ASSERT (0, stack_end < info->client_info.stack_end, "Can only lower stack end");
2495 info->client_info.stack_end = stack_end;
2505 mono_gc_register_root (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2507 return sgen_register_root (start, size, descr, descr ? ROOT_TYPE_NORMAL : ROOT_TYPE_PINNED, source, msg);
2511 mono_gc_register_root_wbarrier (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2513 return sgen_register_root (start, size, descr, ROOT_TYPE_WBARRIER, source, msg);
2517 mono_gc_deregister_root (char* addr)
2519 sgen_deregister_root (addr);
2528 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
2532 mono_threads_join_lock ();
2533 res = pthread_create (new_thread, attr, start_routine, arg);
2534 mono_threads_join_unlock ();
2545 sgen_client_total_allocated_heap_changed (size_t allocated_heap)
2547 mono_runtime_resource_check_limit (MONO_RESOURCE_GC_HEAP, allocated_heap);
2551 mono_gc_user_markers_supported (void)
2557 mono_object_is_alive (MonoObject* o)
2563 mono_gc_get_generation (MonoObject *obj)
2565 if (sgen_ptr_in_nursery (obj))
2571 mono_gc_get_gc_name (void)
2577 mono_gc_get_description (void)
2579 #ifdef HAVE_CONC_GC_AS_DEFAULT
2580 return g_strdup ("sgen (concurrent by default)");
2582 return g_strdup ("sgen");
2587 mono_gc_set_desktop_mode (void)
2592 mono_gc_is_moving (void)
2598 mono_gc_is_disabled (void)
2604 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
2611 mono_gc_max_generation (void)
2617 mono_gc_precise_stack_mark_enabled (void)
2619 return !conservative_stack_mark;
2623 mono_gc_collect (int generation)
2625 sgen_gc_collect (generation);
2629 mono_gc_collection_count (int generation)
2631 return sgen_gc_collection_count (generation);
2635 mono_gc_get_used_size (void)
2637 return (int64_t)sgen_gc_get_used_size ();
2641 mono_gc_get_heap_size (void)
2643 return (int64_t)sgen_gc_get_total_heap_allocation ();
2647 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
2649 return sgen_make_user_root_descriptor (marker);
2653 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
2655 return SGEN_DESC_STRING;
2659 mono_gc_get_nursery (int *shift_bits, size_t *size)
2661 *size = sgen_nursery_size;
2662 *shift_bits = DEFAULT_NURSERY_BITS;
2663 return sgen_get_nursery_start ();
2667 mono_gc_get_los_limit (void)
2669 return SGEN_MAX_SMALL_OBJ_SIZE;
2673 sgen_client_default_metadata (void)
2675 return mono_domain_get ();
2679 sgen_client_metadata_for_object (GCObject *obj)
2681 return mono_object_domain (obj);
2685 * mono_gchandle_is_in_domain:
2686 * \param gchandle a GCHandle's handle.
2687 * \param domain An application domain.
2688 * \returns TRUE if the object wrapped by the \p gchandle belongs to the specific \p domain.
2691 mono_gchandle_is_in_domain (guint32 gchandle, MonoDomain *domain)
2693 MonoDomain *gchandle_domain = (MonoDomain *)sgen_gchandle_get_metadata (gchandle);
2694 return domain->domain_id == gchandle_domain->domain_id;
2698 * mono_gchandle_free_domain:
2699 * \param unloading domain that is unloading
2701 * Function used internally to cleanup any GC handle for objects belonging
2702 * to the specified domain during appdomain unload.
2705 mono_gchandle_free_domain (MonoDomain *unloading)
2710 null_link_if_in_domain (gpointer hidden, GCHandleType handle_type, int max_generation, gpointer user)
2712 MonoDomain *unloading_domain = (MonoDomain *)user;
2713 MonoDomain *obj_domain;
2714 gboolean is_weak = MONO_GC_HANDLE_TYPE_IS_WEAK (handle_type);
2715 if (MONO_GC_HANDLE_IS_OBJECT_POINTER (hidden)) {
2716 MonoObject *obj = (MonoObject *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2717 obj_domain = mono_object_domain (obj);
2719 obj_domain = (MonoDomain *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2721 if (unloading_domain->domain_id == obj_domain->domain_id)
2727 sgen_null_links_for_domain (MonoDomain *domain)
2730 for (type = HANDLE_TYPE_MIN; type < HANDLE_TYPE_MAX; ++type)
2731 sgen_gchandle_iterate ((GCHandleType)type, GENERATION_OLD, null_link_if_in_domain, domain);
2735 mono_gchandle_set_target (guint32 gchandle, MonoObject *obj)
2737 sgen_gchandle_set_target (gchandle, obj);
2741 sgen_client_gchandle_created (int handle_type, GCObject *obj, guint32 handle)
2743 #ifndef DISABLE_PERFCOUNTERS
2744 mono_perfcounters->gc_num_handles++;
2746 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_CREATED, handle_type, handle, obj);
2750 sgen_client_gchandle_destroyed (int handle_type, guint32 handle)
2752 #ifndef DISABLE_PERFCOUNTERS
2753 mono_perfcounters->gc_num_handles--;
2755 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_DESTROYED, handle_type, handle, NULL);
2759 sgen_client_ensure_weak_gchandles_accessible (void)
2762 * During the second bridge processing step the world is
2763 * running again. That step processes all weak links once
2764 * more to null those that refer to dead objects. Before that
2765 * is completed, those links must not be followed, so we
2766 * conservatively wait for bridge processing when any weak
2767 * link is dereferenced.
2769 /* FIXME: A GC can occur after this check fails, in which case we
2770 * should wait for bridge processing but would fail to do so.
2772 if (G_UNLIKELY (bridge_processing_in_progress))
2773 mono_gc_wait_for_bridge_processing ();
2777 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
2781 result = func (data);
2782 UNLOCK_INTERRUPTION;
2787 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
2793 mono_gc_get_card_table (int *shift_bits, gpointer *mask)
2795 return sgen_get_card_table_configuration (shift_bits, mask);
2799 mono_gc_card_table_nursery_check (void)
2801 return !sgen_get_major_collector ()->is_concurrent;
2804 /* Negative value to remove */
2806 mono_gc_add_memory_pressure (gint64 value)
2808 /* FIXME: Implement at some point? */
2816 sgen_client_degraded_allocation (size_t size)
2818 static int last_major_gc_warned = -1;
2819 static int num_degraded = 0;
2821 if (last_major_gc_warned < (int)gc_stats.major_gc_count) {
2823 if (num_degraded == 1 || num_degraded == 3)
2824 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Degraded allocation. Consider increasing nursery-size if the warning persists.");
2825 else if (num_degraded == 10)
2826 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Repeated degraded allocation. Consider increasing nursery-size.");
2827 last_major_gc_warned = gc_stats.major_gc_count;
2836 sgen_client_description_for_internal_mem_type (int type)
2839 case INTERNAL_MEM_EPHEMERON_LINK: return "ephemeron-link";
2840 case INTERNAL_MEM_MOVED_OBJECT: return "moved-object";
2847 sgen_client_pre_collection_checks (void)
2849 if (sgen_mono_xdomain_checks) {
2850 sgen_clear_nursery_fragments ();
2851 sgen_check_for_xdomain_refs ();
2856 sgen_client_vtable_is_inited (MonoVTable *vt)
2858 return vt->klass->inited;
2862 sgen_client_vtable_get_namespace (MonoVTable *vt)
2864 return vt->klass->name_space;
2868 sgen_client_vtable_get_name (MonoVTable *vt)
2870 return vt->klass->name;
2878 sgen_client_init (void)
2881 MonoThreadInfoCallbacks cb;
2883 cb.thread_register = sgen_thread_register;
2884 cb.thread_detach = sgen_thread_detach;
2885 cb.thread_unregister = sgen_thread_unregister;
2886 cb.thread_attach = sgen_thread_attach;
2887 cb.mono_thread_in_critical_region = thread_in_critical_region;
2888 cb.ip_in_critical_region = ip_in_critical_region;
2890 mono_threads_init (&cb, sizeof (SgenThreadInfo));
2892 ///* Keep this the default for now */
2893 /* Precise marking is broken on all supported targets. Disable until fixed. */
2894 conservative_stack_mark = TRUE;
2896 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_EPHEMERON_LINK, sizeof (EphemeronLinkNode));
2898 mono_sgen_init_stw ();
2900 mono_tls_init_gc_keys ();
2902 mono_gc_register_thread (&dummy);
2906 sgen_client_handle_gc_param (const char *opt)
2908 if (g_str_has_prefix (opt, "stack-mark=")) {
2909 opt = strchr (opt, '=') + 1;
2910 if (!strcmp (opt, "precise")) {
2911 conservative_stack_mark = FALSE;
2912 } else if (!strcmp (opt, "conservative")) {
2913 conservative_stack_mark = TRUE;
2915 sgen_env_var_error (MONO_GC_PARAMS_NAME, conservative_stack_mark ? "Using `conservative`." : "Using `precise`.",
2916 "Invalid value `%s` for `stack-mark` option, possible values are: `precise`, `conservative`.", opt);
2918 } else if (g_str_has_prefix (opt, "bridge-implementation=")) {
2919 opt = strchr (opt, '=') + 1;
2920 sgen_set_bridge_implementation (opt);
2921 } else if (g_str_has_prefix (opt, "toggleref-test")) {
2922 /* FIXME: This should probably in MONO_GC_DEBUG */
2923 sgen_register_test_toggleref_callback ();
2924 } else if (!sgen_bridge_handle_gc_param (opt)) {
2931 sgen_client_print_gc_params_usage (void)
2933 fprintf (stderr, " stack-mark=MARK-METHOD (where MARK-METHOD is 'precise' or 'conservative')\n");
2937 sgen_client_handle_gc_debug (const char *opt)
2939 if (!strcmp (opt, "xdomain-checks")) {
2940 sgen_mono_xdomain_checks = TRUE;
2941 } else if (!strcmp (opt, "do-not-finalize")) {
2942 mono_do_not_finalize = TRUE;
2943 } else if (g_str_has_prefix (opt, "do-not-finalize=")) {
2944 opt = strchr (opt, '=') + 1;
2945 mono_do_not_finalize = TRUE;
2946 mono_do_not_finalize_class_names = g_strsplit (opt, ",", 0);
2947 } else if (!strcmp (opt, "log-finalizers")) {
2948 log_finalizers = TRUE;
2949 } else if (!strcmp (opt, "no-managed-allocator")) {
2950 sgen_set_use_managed_allocator (FALSE);
2951 } else if (!sgen_bridge_handle_gc_debug (opt)) {
2958 sgen_client_print_gc_debug_usage (void)
2960 fprintf (stderr, " xdomain-checks\n");
2961 fprintf (stderr, " do-not-finalize\n");
2962 fprintf (stderr, " log-finalizers\n");
2963 fprintf (stderr, " no-managed-allocator\n");
2964 sgen_bridge_print_gc_debug_usage ();
2969 sgen_client_get_provenance (void)
2971 #ifdef SGEN_OBJECT_PROVENANCE
2972 MonoGCCallbacks *cb = mono_gc_get_gc_callbacks ();
2973 gpointer (*get_provenance_func) (void);
2976 get_provenance_func = cb->get_provenance_func;
2977 if (get_provenance_func)
2978 return get_provenance_func ();
2986 sgen_client_describe_invalid_pointer (GCObject *ptr)
2988 sgen_bridge_describe_pointer (ptr);
2991 static gboolean gc_inited;
2994 * mono_gc_base_init:
2997 mono_gc_base_init (void)
3002 mono_counters_init ();
3005 mono_w32handle_init ();
3008 #ifdef HEAVY_STATISTICS
3009 mono_counters_register ("los marked cards", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_marked_cards);
3010 mono_counters_register ("los array cards scanned ", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_cards);
3011 mono_counters_register ("los array remsets", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_remsets);
3013 mono_counters_register ("WBarrier set arrayref", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_set_arrayref);
3014 mono_counters_register ("WBarrier value copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_value_copy);
3015 mono_counters_register ("WBarrier object copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_object_copy);
3024 mono_gc_base_cleanup (void)
3026 sgen_thread_pool_shutdown (major_collector.get_sweep_pool ());
3028 sgen_workers_shutdown ();
3030 // We should have consumed any outstanding moves.
3031 g_assert (sgen_pointer_queue_is_empty (&moved_objects_queue));
3035 mono_gc_is_null (void)