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 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 (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
159 HEAVY_STAT (++stat_wbarrier_set_arrayref);
160 if (sgen_ptr_in_nursery (slot_ptr)) {
161 *(void**)slot_ptr = value;
164 SGEN_LOG (8, "Adding remset at %p", slot_ptr);
166 binary_protocol_wbarrier (slot_ptr, value, value->vtable);
168 sgen_get_remset ()->wbarrier_set_field ((GCObject*)arr, slot_ptr, value);
172 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
174 mono_gc_wbarrier_set_arrayref ((MonoArray*)obj, field_ptr, value);
178 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
180 sgen_wbarrier_value_copy_bitmap (_dest, _src, size, bitmap);
184 mono_gc_get_suspend_signal (void)
186 return mono_threads_suspend_get_suspend_signal ();
190 mono_gc_get_restart_signal (void)
192 return mono_threads_suspend_get_restart_signal ();
195 static MonoMethod *write_barrier_conc_method;
196 static MonoMethod *write_barrier_noconc_method;
199 sgen_is_critical_method (MonoMethod *method)
201 return sgen_is_managed_allocator (method);
205 sgen_has_critical_method (void)
207 return sgen_has_managed_allocator ();
211 ip_in_critical_region (MonoDomain *domain, gpointer ip)
217 * We pass false for 'try_aot' so this becomes async safe.
218 * It won't find aot methods whose jit info is not yet loaded,
219 * so we preload their jit info in the JIT.
221 ji = mono_jit_info_table_find_internal (domain, ip, FALSE, FALSE);
225 method = mono_jit_info_get_method (ji);
227 return mono_runtime_is_critical_method (method) || sgen_is_critical_method (method);
231 mono_gc_is_critical_method (MonoMethod *method)
233 return sgen_is_critical_method (method);
239 emit_nursery_check (MonoMethodBuilder *mb, int *nursery_check_return_labels, gboolean is_concurrent)
241 int shifted_nursery_start = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
243 memset (nursery_check_return_labels, 0, sizeof (int) * 2);
244 // if (ptr_in_nursery (ptr)) return;
246 * Masking out the bits might be faster, but we would have to use 64 bit
247 * immediates, which might be slower.
249 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
250 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_START);
251 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
252 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
253 mono_mb_emit_byte (mb, CEE_SHR_UN);
254 mono_mb_emit_stloc (mb, shifted_nursery_start);
256 mono_mb_emit_ldarg (mb, 0);
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_ldloc (mb, shifted_nursery_start);
261 nursery_check_return_labels [0] = mono_mb_emit_branch (mb, CEE_BEQ);
263 if (!is_concurrent) {
264 // if (!ptr_in_nursery (*ptr)) return;
265 mono_mb_emit_ldarg (mb, 0);
266 mono_mb_emit_byte (mb, CEE_LDIND_I);
267 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
268 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
269 mono_mb_emit_byte (mb, CEE_SHR_UN);
270 mono_mb_emit_ldloc (mb, shifted_nursery_start);
271 nursery_check_return_labels [1] = mono_mb_emit_branch (mb, CEE_BNE_UN);
277 mono_gc_get_specific_write_barrier (gboolean is_concurrent)
280 MonoMethodBuilder *mb;
281 MonoMethodSignature *sig;
282 MonoMethod **write_barrier_method_addr;
284 #ifdef MANAGED_WBARRIER
285 int i, nursery_check_labels [2];
288 // FIXME: Maybe create a separate version for ctors (the branch would be
289 // correctly predicted more times)
291 write_barrier_method_addr = &write_barrier_conc_method;
293 write_barrier_method_addr = &write_barrier_noconc_method;
295 if (*write_barrier_method_addr)
296 return *write_barrier_method_addr;
298 /* Create the IL version of mono_gc_barrier_generic_store () */
299 sig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
300 sig->ret = &mono_defaults.void_class->byval_arg;
301 sig->params [0] = &mono_defaults.int_class->byval_arg;
304 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_conc", MONO_WRAPPER_WRITE_BARRIER);
306 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_noconc", MONO_WRAPPER_WRITE_BARRIER);
309 #ifdef MANAGED_WBARRIER
310 emit_nursery_check (mb, nursery_check_labels, is_concurrent);
312 addr = sgen_cardtable + ((address >> CARD_BITS) & CARD_MASK)
316 LDC_PTR sgen_cardtable
322 if (SGEN_HAVE_OVERLAPPING_CARDS) {
323 LDC_PTR card_table_mask
330 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
331 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_CARD_TABLE);
332 mono_mb_emit_ldarg (mb, 0);
333 mono_mb_emit_icon (mb, CARD_BITS);
334 mono_mb_emit_byte (mb, CEE_SHR_UN);
335 mono_mb_emit_byte (mb, CEE_CONV_I);
336 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
337 #if SIZEOF_VOID_P == 8
338 mono_mb_emit_icon8 (mb, CARD_MASK);
340 mono_mb_emit_icon (mb, CARD_MASK);
342 mono_mb_emit_byte (mb, CEE_CONV_I);
343 mono_mb_emit_byte (mb, CEE_AND);
345 mono_mb_emit_byte (mb, CEE_ADD);
346 mono_mb_emit_icon (mb, 1);
347 mono_mb_emit_byte (mb, CEE_STIND_I1);
350 for (i = 0; i < 2; ++i) {
351 if (nursery_check_labels [i])
352 mono_mb_patch_branch (mb, nursery_check_labels [i]);
354 mono_mb_emit_byte (mb, CEE_RET);
356 mono_mb_emit_ldarg (mb, 0);
357 mono_mb_emit_icall (mb, mono_gc_wbarrier_generic_nostore);
358 mono_mb_emit_byte (mb, CEE_RET);
361 res = mono_mb_create_method (mb, sig, 16);
362 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
363 mono_marshal_set_wrapper_info (res, info);
367 if (*write_barrier_method_addr) {
368 /* Already created */
369 mono_free_method (res);
371 /* double-checked locking */
372 mono_memory_barrier ();
373 *write_barrier_method_addr = res;
377 return *write_barrier_method_addr;
381 mono_gc_get_write_barrier (void)
383 return mono_gc_get_specific_write_barrier (major_collector.is_concurrent);
387 * Dummy filler objects
390 /* Vtable of the objects used to fill out nursery fragments before a collection */
391 static GCVTable array_fill_vtable;
394 get_array_fill_vtable (void)
396 if (!array_fill_vtable) {
397 static MonoClass klass;
398 static char _vtable[sizeof(MonoVTable)+8];
399 MonoVTable* vtable = (MonoVTable*) ALIGN_TO((mword)_vtable, 8);
402 MonoDomain *domain = mono_get_root_domain ();
405 klass.element_class = mono_defaults.byte_class;
407 klass.instance_size = MONO_SIZEOF_MONO_ARRAY;
408 klass.sizes.element_size = 1;
409 klass.name = "array_filler_type";
411 vtable->klass = &klass;
413 vtable->gc_descr = mono_gc_make_descr_for_array (TRUE, &bmap, 0, 1);
416 array_fill_vtable = vtable;
418 return array_fill_vtable;
422 sgen_client_array_fill_range (char *start, size_t size)
426 if (size < MONO_SIZEOF_MONO_ARRAY) {
427 memset (start, 0, size);
431 o = (MonoArray*)start;
432 o->obj.vtable = (MonoVTable*)get_array_fill_vtable ();
433 /* Mark this as not a real object */
434 o->obj.synchronisation = (MonoThreadsSync *)GINT_TO_POINTER (-1);
436 o->max_length = (mono_array_size_t)(size - MONO_SIZEOF_MONO_ARRAY);
442 sgen_client_zero_array_fill_header (void *p, size_t size)
444 if (size >= MONO_SIZEOF_MONO_ARRAY) {
445 memset (p, 0, MONO_SIZEOF_MONO_ARRAY);
447 static guint8 zeros [MONO_SIZEOF_MONO_ARRAY];
449 SGEN_ASSERT (0, !memcmp (p, zeros, size), "TLAB segment must be zeroed out.");
457 static MonoGCFinalizerCallbacks fin_callbacks;
460 mono_gc_get_vtable_bits (MonoClass *klass)
463 /* FIXME move this to the bridge code */
464 if (sgen_need_bridge_processing ()) {
465 switch (sgen_bridge_class_kind (klass)) {
466 case GC_BRIDGE_TRANSPARENT_BRIDGE_CLASS:
467 case GC_BRIDGE_OPAQUE_BRIDGE_CLASS:
468 res = SGEN_GC_BIT_BRIDGE_OBJECT;
470 case GC_BRIDGE_OPAQUE_CLASS:
471 res = SGEN_GC_BIT_BRIDGE_OPAQUE_OBJECT;
473 case GC_BRIDGE_TRANSPARENT_CLASS:
477 if (fin_callbacks.is_class_finalization_aware) {
478 if (fin_callbacks.is_class_finalization_aware (klass))
479 res |= SGEN_GC_BIT_FINALIZER_AWARE;
485 is_finalization_aware (MonoObject *obj)
487 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
488 return (vt->gc_bits & SGEN_GC_BIT_FINALIZER_AWARE) == SGEN_GC_BIT_FINALIZER_AWARE;
492 sgen_client_object_queued_for_finalization (GCObject *obj)
494 if (fin_callbacks.object_queued_for_finalization && is_finalization_aware (obj))
495 fin_callbacks.object_queued_for_finalization (obj);
498 if (G_UNLIKELY (MONO_GC_FINALIZE_ENQUEUE_ENABLED ())) {
499 int gen = sgen_ptr_in_nursery (obj) ? GENERATION_NURSERY : GENERATION_OLD;
500 GCVTable vt = SGEN_LOAD_VTABLE (obj);
501 MONO_GC_FINALIZE_ENQUEUE ((mword)obj, sgen_safe_object_get_size (obj),
502 sgen_client_vtable_get_namespace (vt), sgen_client_vtable_get_name (vt), gen,
503 sgen_client_object_has_critical_finalizer (obj));
509 mono_gc_register_finalizer_callbacks (MonoGCFinalizerCallbacks *callbacks)
511 if (callbacks->version != MONO_GC_FINALIZER_EXTENSION_VERSION)
512 g_error ("Invalid finalizer callback version. Expected %d but got %d\n", MONO_GC_FINALIZER_EXTENSION_VERSION, callbacks->version);
514 fin_callbacks = *callbacks;
518 sgen_client_run_finalize (MonoObject *obj)
520 mono_gc_run_finalize (obj, NULL);
524 mono_gc_invoke_finalizers (void)
526 return sgen_gc_invoke_finalizers ();
530 mono_gc_pending_finalizers (void)
532 return sgen_have_pending_finalizers ();
536 sgen_client_finalize_notify (void)
538 mono_gc_finalize_notify ();
542 mono_gc_register_for_finalization (MonoObject *obj, void *user_data)
544 sgen_object_register_for_finalization (obj, user_data);
548 object_in_domain_predicate (MonoObject *obj, void *user_data)
550 MonoDomain *domain = (MonoDomain *)user_data;
551 if (mono_object_domain (obj) == domain) {
552 SGEN_LOG (5, "Unregistering finalizer for object: %p (%s)", obj, sgen_client_vtable_get_name (SGEN_LOAD_VTABLE (obj)));
559 * mono_gc_finalizers_for_domain:
560 * \param domain the unloading appdomain
561 * \param out_array output array
562 * \param out_size size of output array
563 * Enqueue for finalization all objects that belong to the unloading appdomain \p domain.
564 * \p suspend is used for early termination of the enqueuing process.
567 mono_gc_finalize_domain (MonoDomain *domain)
569 sgen_finalize_if (object_in_domain_predicate, domain);
573 mono_gc_suspend_finalizers (void)
575 sgen_set_suspend_finalizers ();
582 typedef struct _EphemeronLinkNode EphemeronLinkNode;
584 struct _EphemeronLinkNode {
585 EphemeronLinkNode *next;
594 static EphemeronLinkNode *ephemeron_list;
596 /* LOCKING: requires that the GC lock is held */
598 null_ephemerons_for_domain (MonoDomain *domain)
600 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
603 MonoObject *object = (MonoObject*)current->array;
606 SGEN_ASSERT (0, object->vtable, "Can't have objects without vtables.");
608 if (object && object->vtable->domain == domain) {
609 EphemeronLinkNode *tmp = current;
612 prev->next = current->next;
614 ephemeron_list = current->next;
616 current = current->next;
617 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
620 current = current->next;
625 /* LOCKING: requires that the GC lock is held */
627 sgen_client_clear_unreachable_ephemerons (ScanCopyContext ctx)
629 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
630 SgenGrayQueue *queue = ctx.queue;
631 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
632 Ephemeron *cur, *array_end;
636 MonoArray *array = current->array;
638 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
639 EphemeronLinkNode *tmp = current;
641 SGEN_LOG (5, "Dead Ephemeron array at %p", array);
644 prev->next = current->next;
646 ephemeron_list = current->next;
648 current = current->next;
649 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
654 copy_func ((GCObject**)&array, queue);
655 current->array = array;
657 SGEN_LOG (5, "Clearing unreachable entries for ephemeron array at %p", array);
659 cur = mono_array_addr (array, Ephemeron, 0);
660 array_end = cur + mono_array_length_fast (array);
661 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
663 for (; cur < array_end; ++cur) {
664 GCObject *key = cur->key;
666 if (!key || key == tombstone)
669 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
670 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
671 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
673 if (!sgen_is_object_alive_for_current_gen (key)) {
674 cur->key = tombstone;
680 current = current->next;
685 LOCKING: requires that the GC lock is held
687 Limitations: We scan all ephemerons on every collection since the current design doesn't allow for a simple nursery/mature split.
690 sgen_client_mark_ephemerons (ScanCopyContext ctx)
692 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
693 SgenGrayQueue *queue = ctx.queue;
694 gboolean nothing_marked = TRUE;
695 EphemeronLinkNode *current = ephemeron_list;
696 Ephemeron *cur, *array_end;
699 for (current = ephemeron_list; current; current = current->next) {
700 MonoArray *array = current->array;
701 SGEN_LOG (5, "Ephemeron array at %p", array);
703 /*It has to be alive*/
704 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
705 SGEN_LOG (5, "\tnot reachable");
709 copy_func ((GCObject**)&array, queue);
711 cur = mono_array_addr (array, Ephemeron, 0);
712 array_end = cur + mono_array_length_fast (array);
713 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
715 for (; cur < array_end; ++cur) {
716 GCObject *key = cur->key;
718 if (!key || key == tombstone)
721 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
722 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
723 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
725 if (sgen_is_object_alive_for_current_gen (key)) {
726 GCObject *value = cur->value;
728 copy_func (&cur->key, queue);
730 if (!sgen_is_object_alive_for_current_gen (value))
731 nothing_marked = FALSE;
732 copy_func (&cur->value, queue);
738 SGEN_LOG (5, "Ephemeron run finished. Is it done %d", nothing_marked);
739 return nothing_marked;
743 mono_gc_ephemeron_array_add (MonoObject *obj)
745 EphemeronLinkNode *node;
749 node = (EphemeronLinkNode *)sgen_alloc_internal (INTERNAL_MEM_EPHEMERON_LINK);
754 node->array = (MonoArray*)obj;
755 node->next = ephemeron_list;
756 ephemeron_list = node;
758 SGEN_LOG (5, "Registered ephemeron array %p", obj);
769 need_remove_object_for_domain (GCObject *start, MonoDomain *domain)
771 if (mono_object_domain (start) == domain) {
772 SGEN_LOG (4, "Need to cleanup object %p", start);
773 binary_protocol_cleanup (start, (gpointer)SGEN_LOAD_VTABLE (start), sgen_safe_object_get_size ((GCObject*)start));
780 process_object_for_domain_clearing (GCObject *start, MonoDomain *domain)
782 MonoVTable *vt = SGEN_LOAD_VTABLE (start);
783 if (vt->klass == mono_defaults.internal_thread_class)
784 g_assert (mono_object_domain (start) == mono_get_root_domain ());
785 /* The object could be a proxy for an object in the domain
787 #ifndef DISABLE_REMOTING
788 if (mono_defaults.real_proxy_class->supertypes && mono_class_has_parent_fast (vt->klass, mono_defaults.real_proxy_class)) {
789 MonoObject *server = ((MonoRealProxy*)start)->unwrapped_server;
791 /* The server could already have been zeroed out, so
792 we need to check for that, too. */
793 if (server && (!SGEN_LOAD_VTABLE (server) || mono_object_domain (server) == domain)) {
794 SGEN_LOG (4, "Cleaning up remote pointer in %p to object %p", start, server);
795 ((MonoRealProxy*)start)->unwrapped_server = NULL;
802 clear_domain_process_object (GCObject *obj, MonoDomain *domain)
806 process_object_for_domain_clearing (obj, domain);
807 remove = need_remove_object_for_domain (obj, domain);
809 if (remove && obj->synchronisation) {
810 guint32 dislink = mono_monitor_get_object_monitor_gchandle (obj);
812 mono_gchandle_free (dislink);
819 clear_domain_process_minor_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
821 if (clear_domain_process_object (obj, domain)) {
822 CANARIFY_SIZE (size);
823 memset (obj, 0, size);
828 clear_domain_process_major_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
830 clear_domain_process_object (obj, domain);
834 clear_domain_free_major_non_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
836 if (need_remove_object_for_domain (obj, domain))
837 major_collector.free_non_pinned_object (obj, size);
841 clear_domain_free_major_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
843 if (need_remove_object_for_domain (obj, domain))
844 major_collector.free_pinned_object (obj, size);
848 * When appdomains are unloaded we can easily remove objects that have finalizers,
849 * but all the others could still be present in random places on the heap.
850 * We need a sweep to get rid of them even though it's going to be costly
852 * The reason we need to remove them is because we access the vtable and class
853 * structures to know the object size and the reference bitmap: once the domain is
854 * unloaded the point to random memory.
857 mono_gc_clear_domain (MonoDomain * domain)
859 LOSObject *bigobj, *prev;
864 binary_protocol_domain_unload_begin (domain);
868 if (sgen_concurrent_collection_in_progress ())
869 sgen_perform_collection (0, GENERATION_OLD, "clear domain", TRUE, FALSE);
870 SGEN_ASSERT (0, !sgen_concurrent_collection_in_progress (), "We just ordered a synchronous collection. Why are we collecting concurrently?");
872 major_collector.finish_sweeping ();
874 sgen_process_fin_stage_entries ();
876 sgen_clear_nursery_fragments ();
878 if (sgen_mono_xdomain_checks && domain != mono_get_root_domain ()) {
879 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_NORMAL);
880 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_WBARRIER);
881 sgen_check_for_xdomain_refs ();
884 /*Ephemerons and dislinks must be processed before LOS since they might end up pointing
885 to memory returned to the OS.*/
886 null_ephemerons_for_domain (domain);
887 sgen_null_links_for_domain (domain);
889 for (i = GENERATION_NURSERY; i < GENERATION_MAX; ++i)
890 sgen_remove_finalizers_if (object_in_domain_predicate, domain, i);
892 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
893 (IterateObjectCallbackFunc)clear_domain_process_minor_object_callback, domain, FALSE, TRUE);
895 /* We need two passes over major and large objects because
896 freeing such objects might give their memory back to the OS
897 (in the case of large objects) or obliterate its vtable
898 (pinned objects with major-copying or pinned and non-pinned
899 objects with major-mark&sweep), but we might need to
900 dereference a pointer from an object to another object if
901 the first object is a proxy. */
902 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, (IterateObjectCallbackFunc)clear_domain_process_major_object_callback, domain);
903 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
904 clear_domain_process_object ((GCObject*)bigobj->data, domain);
907 for (bigobj = los_object_list; bigobj;) {
908 if (need_remove_object_for_domain ((GCObject*)bigobj->data, domain)) {
909 LOSObject *to_free = bigobj;
911 prev->next = bigobj->next;
913 los_object_list = bigobj->next;
914 bigobj = bigobj->next;
915 SGEN_LOG (4, "Freeing large object %p", bigobj->data);
916 sgen_los_free_object (to_free);
920 bigobj = bigobj->next;
922 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_NON_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_non_pinned_object_callback, domain);
923 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_pinned_object_callback, domain);
925 if (domain == mono_get_root_domain ()) {
926 sgen_pin_stats_report ();
927 sgen_object_layout_dump (stdout);
930 sgen_restart_world (0);
932 binary_protocol_domain_unload_end (domain);
933 binary_protocol_flush_buffers (FALSE);
943 mono_gc_alloc_obj (MonoVTable *vtable, size_t size)
945 MonoObject *obj = sgen_alloc_obj (vtable, size);
947 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
949 mono_profiler_allocation (obj);
956 mono_gc_alloc_pinned_obj (MonoVTable *vtable, size_t size)
958 MonoObject *obj = sgen_alloc_obj_pinned (vtable, size);
960 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
962 mono_profiler_allocation (obj);
969 mono_gc_alloc_mature (MonoVTable *vtable, size_t size)
971 MonoObject *obj = sgen_alloc_obj_mature (vtable, size);
973 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
975 mono_profiler_allocation (obj);
982 mono_gc_alloc_fixed (size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
984 /* FIXME: do a single allocation */
985 void *res = g_calloc (1, size);
988 if (!mono_gc_register_root ((char *)res, size, descr, source, msg)) {
996 mono_gc_free_fixed (void* addr)
998 mono_gc_deregister_root ((char *)addr);
1006 static MonoMethod* alloc_method_cache [ATYPE_NUM];
1007 static MonoMethod* slowpath_alloc_method_cache [ATYPE_NUM];
1008 static gboolean use_managed_allocator = TRUE;
1010 #ifdef MANAGED_ALLOCATION
1011 // Cache the SgenThreadInfo pointer in a local 'var'.
1012 #define EMIT_TLS_ACCESS_VAR(mb, var) \
1014 var = mono_mb_add_local ((mb), &mono_defaults.int_class->byval_arg); \
1015 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1016 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1017 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1018 mono_mb_emit_stloc ((mb), (var)); \
1021 #define EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR(mb, var) \
1023 mono_mb_emit_ldloc ((mb), (var)); \
1024 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenClientThreadInfo, in_critical_region)); \
1025 mono_mb_emit_byte ((mb), CEE_ADD); \
1028 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb, var) do { \
1029 mono_mb_emit_ldloc ((mb), (var)); \
1030 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_next)); \
1031 mono_mb_emit_byte ((mb), CEE_ADD); \
1034 #define EMIT_TLS_ACCESS_TEMP_END(mb, var) do { \
1035 mono_mb_emit_ldloc ((mb), (var)); \
1036 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_temp_end)); \
1037 mono_mb_emit_byte ((mb), CEE_ADD); \
1038 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1041 /* FIXME: Do this in the JIT, where specialized allocation sequences can be created
1042 * for each class. This is currently not easy to do, as it is hard to generate basic
1043 * blocks + branches, but it is easy with the linear IL codebase.
1045 * For this to work we'd need to solve the TLAB race, first. Now we
1046 * require the allocator to be in a few known methods to make sure
1047 * that they are executed atomically via the restart mechanism.
1050 create_allocator (int atype, ManagedAllocatorVariant variant)
1052 int p_var, size_var, real_size_var, thread_var G_GNUC_UNUSED;
1053 gboolean slowpath = variant == MANAGED_ALLOCATOR_SLOW_PATH;
1054 guint32 fastpath_branch, max_size_branch, no_oom_branch;
1055 MonoMethodBuilder *mb;
1057 MonoMethodSignature *csig;
1058 static gboolean registered = FALSE;
1059 int tlab_next_addr_var, new_next_var;
1060 const char *name = NULL;
1065 mono_register_jit_icall (mono_gc_alloc_obj, "mono_gc_alloc_obj", mono_create_icall_signature ("object ptr int"), FALSE);
1066 mono_register_jit_icall (mono_gc_alloc_vector, "mono_gc_alloc_vector", mono_create_icall_signature ("object ptr int int"), FALSE);
1067 mono_register_jit_icall (mono_gc_alloc_string, "mono_gc_alloc_string", mono_create_icall_signature ("object ptr int int32"), FALSE);
1071 if (atype == ATYPE_SMALL) {
1072 name = slowpath ? "SlowAllocSmall" : "AllocSmall";
1073 } else if (atype == ATYPE_NORMAL) {
1074 name = slowpath ? "SlowAlloc" : "Alloc";
1075 } else if (atype == ATYPE_VECTOR) {
1076 name = slowpath ? "SlowAllocVector" : "AllocVector";
1077 } else if (atype == ATYPE_STRING) {
1078 name = slowpath ? "SlowAllocString" : "AllocString";
1080 g_assert_not_reached ();
1083 if (atype == ATYPE_NORMAL)
1088 csig = mono_metadata_signature_alloc (mono_defaults.corlib, num_params);
1089 if (atype == ATYPE_STRING) {
1090 csig->ret = &mono_defaults.string_class->byval_arg;
1091 csig->params [0] = &mono_defaults.int_class->byval_arg;
1092 csig->params [1] = &mono_defaults.int32_class->byval_arg;
1094 csig->ret = &mono_defaults.object_class->byval_arg;
1095 for (i = 0; i < num_params; i++)
1096 csig->params [i] = &mono_defaults.int_class->byval_arg;
1099 mb = mono_mb_new (mono_defaults.object_class, name, MONO_WRAPPER_ALLOC);
1106 mono_mb_emit_ldarg (mb, 0);
1107 mono_mb_emit_icall (mb, ves_icall_object_new_specific);
1110 mono_mb_emit_ldarg (mb, 0);
1111 mono_mb_emit_ldarg (mb, 1);
1112 mono_mb_emit_icall (mb, ves_icall_array_new_specific);
1115 mono_mb_emit_ldarg (mb, 1);
1116 mono_mb_emit_icall (mb, ves_icall_string_alloc);
1119 g_assert_not_reached ();
1126 * Tls access might call foreign code or code without jinfo. This can
1127 * only happen if we are outside of the critical region.
1129 EMIT_TLS_ACCESS_VAR (mb, thread_var);
1131 size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1132 if (atype == ATYPE_SMALL) {
1133 /* size_var = size_arg */
1134 mono_mb_emit_ldarg (mb, 1);
1135 mono_mb_emit_stloc (mb, size_var);
1136 } else if (atype == ATYPE_NORMAL) {
1137 /* size = vtable->klass->instance_size; */
1138 mono_mb_emit_ldarg (mb, 0);
1139 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1140 mono_mb_emit_byte (mb, CEE_ADD);
1141 mono_mb_emit_byte (mb, CEE_LDIND_I);
1142 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, instance_size));
1143 mono_mb_emit_byte (mb, CEE_ADD);
1144 /* FIXME: assert instance_size stays a 4 byte integer */
1145 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1146 mono_mb_emit_byte (mb, CEE_CONV_I);
1147 mono_mb_emit_stloc (mb, size_var);
1148 } else if (atype == ATYPE_VECTOR) {
1149 MonoExceptionClause *clause;
1150 int pos, pos_leave, pos_error;
1151 MonoClass *oom_exc_class;
1155 * n > MONO_ARRAY_MAX_INDEX => OutOfMemoryException
1156 * n < 0 => OverflowException
1158 * We can do an unsigned comparison to catch both cases, then in the error
1159 * case compare signed to distinguish between them.
1161 mono_mb_emit_ldarg (mb, 1);
1162 mono_mb_emit_icon (mb, MONO_ARRAY_MAX_INDEX);
1163 mono_mb_emit_byte (mb, CEE_CONV_U);
1164 pos = mono_mb_emit_short_branch (mb, CEE_BLE_UN_S);
1166 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1167 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1168 mono_mb_emit_ldarg (mb, 1);
1169 mono_mb_emit_icon (mb, 0);
1170 pos_error = mono_mb_emit_short_branch (mb, CEE_BLT_S);
1171 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1172 mono_mb_patch_short_branch (mb, pos_error);
1173 mono_mb_emit_exception (mb, "OverflowException", NULL);
1175 mono_mb_patch_short_branch (mb, pos);
1177 clause = (MonoExceptionClause *)mono_image_alloc0 (mono_defaults.corlib, sizeof (MonoExceptionClause));
1178 clause->try_offset = mono_mb_get_label (mb);
1180 /* vtable->klass->sizes.element_size */
1181 mono_mb_emit_ldarg (mb, 0);
1182 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1183 mono_mb_emit_byte (mb, CEE_ADD);
1184 mono_mb_emit_byte (mb, CEE_LDIND_I);
1185 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, sizes));
1186 mono_mb_emit_byte (mb, CEE_ADD);
1187 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1188 mono_mb_emit_byte (mb, CEE_CONV_I);
1191 mono_mb_emit_ldarg (mb, 1);
1192 mono_mb_emit_byte (mb, CEE_MUL_OVF_UN);
1193 /* + sizeof (MonoArray) */
1194 mono_mb_emit_icon (mb, MONO_SIZEOF_MONO_ARRAY);
1195 mono_mb_emit_byte (mb, CEE_ADD_OVF_UN);
1196 mono_mb_emit_stloc (mb, size_var);
1198 pos_leave = mono_mb_emit_branch (mb, CEE_LEAVE);
1201 clause->flags = MONO_EXCEPTION_CLAUSE_NONE;
1202 clause->try_len = mono_mb_get_pos (mb) - clause->try_offset;
1203 clause->data.catch_class = mono_class_load_from_name (mono_defaults.corlib,
1204 "System", "OverflowException");
1205 clause->handler_offset = mono_mb_get_label (mb);
1207 oom_exc_class = mono_class_load_from_name (mono_defaults.corlib,
1208 "System", "OutOfMemoryException");
1209 ctor = mono_class_get_method_from_name (oom_exc_class, ".ctor", 0);
1212 mono_mb_emit_byte (mb, CEE_POP);
1213 mono_mb_emit_op (mb, CEE_NEWOBJ, ctor);
1214 mono_mb_emit_byte (mb, CEE_THROW);
1216 clause->handler_len = mono_mb_get_pos (mb) - clause->handler_offset;
1217 mono_mb_set_clauses (mb, 1, clause);
1218 mono_mb_patch_branch (mb, pos_leave);
1220 } else if (atype == ATYPE_STRING) {
1224 * a string allocator method takes the args: (vtable, len)
1226 * bytes = offsetof (MonoString, chars) + ((len + 1) * 2)
1230 * bytes <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1234 * offsetof (MonoString, chars) + ((len + 1) * 2) <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1235 * len <= (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - offsetof (MonoString, chars)) / 2 - 1
1237 mono_mb_emit_ldarg (mb, 1);
1238 mono_mb_emit_icon (mb, (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - MONO_STRUCT_OFFSET (MonoString, chars)) / 2 - 1);
1239 pos = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
1241 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1242 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1243 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1244 mono_mb_patch_short_branch (mb, pos);
1246 mono_mb_emit_ldarg (mb, 1);
1247 mono_mb_emit_icon (mb, 1);
1248 mono_mb_emit_byte (mb, MONO_CEE_SHL);
1249 //WE manually fold the above + 2 here
1250 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, chars) + 2);
1251 mono_mb_emit_byte (mb, CEE_ADD);
1252 mono_mb_emit_stloc (mb, size_var);
1254 g_assert_not_reached ();
1257 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1258 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1259 mono_mb_emit_byte (mb, CEE_LDC_I4_1);
1260 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1261 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1262 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_NONE);
1265 if (nursery_canaries_enabled ()) {
1266 real_size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1267 mono_mb_emit_ldloc (mb, size_var);
1268 mono_mb_emit_stloc(mb, real_size_var);
1271 real_size_var = size_var;
1273 /* size += ALLOC_ALIGN - 1; */
1274 mono_mb_emit_ldloc (mb, size_var);
1275 mono_mb_emit_icon (mb, SGEN_ALLOC_ALIGN - 1);
1276 mono_mb_emit_byte (mb, CEE_ADD);
1277 /* size &= ~(ALLOC_ALIGN - 1); */
1278 mono_mb_emit_icon (mb, ~(SGEN_ALLOC_ALIGN - 1));
1279 mono_mb_emit_byte (mb, CEE_AND);
1280 mono_mb_emit_stloc (mb, size_var);
1282 /* if (size > MAX_SMALL_OBJ_SIZE) goto slowpath */
1283 if (atype != ATYPE_SMALL) {
1284 mono_mb_emit_ldloc (mb, size_var);
1285 mono_mb_emit_icon (mb, SGEN_MAX_SMALL_OBJ_SIZE);
1286 max_size_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
1290 * We need to modify tlab_next, but the JIT only supports reading, so we read
1291 * another tls var holding its address instead.
1294 /* tlab_next_addr (local) = tlab_next_addr (TLS var) */
1295 tlab_next_addr_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1296 EMIT_TLS_ACCESS_NEXT_ADDR (mb, thread_var);
1297 mono_mb_emit_stloc (mb, tlab_next_addr_var);
1299 /* p = (void**)tlab_next; */
1300 p_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1301 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1302 mono_mb_emit_byte (mb, CEE_LDIND_I);
1303 mono_mb_emit_stloc (mb, p_var);
1305 /* new_next = (char*)p + size; */
1306 new_next_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1307 mono_mb_emit_ldloc (mb, p_var);
1308 mono_mb_emit_ldloc (mb, size_var);
1309 mono_mb_emit_byte (mb, CEE_CONV_I);
1310 mono_mb_emit_byte (mb, CEE_ADD);
1312 if (nursery_canaries_enabled ()) {
1313 mono_mb_emit_icon (mb, CANARY_SIZE);
1314 mono_mb_emit_byte (mb, CEE_ADD);
1316 mono_mb_emit_stloc (mb, new_next_var);
1318 /* if (G_LIKELY (new_next < tlab_temp_end)) */
1319 mono_mb_emit_ldloc (mb, new_next_var);
1320 EMIT_TLS_ACCESS_TEMP_END (mb, thread_var);
1321 fastpath_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
1324 if (atype != ATYPE_SMALL)
1325 mono_mb_patch_short_branch (mb, max_size_branch);
1327 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1328 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1330 * We are no longer in a critical section. We need to do this before calling
1331 * to unmanaged land in order to avoid stw deadlocks since unmanaged code
1334 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1335 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1336 mono_mb_emit_byte (mb, CEE_LDC_I4_0);
1337 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1338 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1339 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_NONE);
1342 /* FIXME: mono_gc_alloc_obj takes a 'size_t' as an argument, not an int32 */
1343 mono_mb_emit_ldarg (mb, 0);
1344 mono_mb_emit_ldloc (mb, real_size_var);
1345 if (atype == ATYPE_NORMAL || atype == ATYPE_SMALL) {
1346 mono_mb_emit_icall (mb, mono_gc_alloc_obj);
1347 } else if (atype == ATYPE_VECTOR) {
1348 mono_mb_emit_ldarg (mb, 1);
1349 mono_mb_emit_icall (mb, mono_gc_alloc_vector);
1350 } else if (atype == ATYPE_STRING) {
1351 mono_mb_emit_ldarg (mb, 1);
1352 mono_mb_emit_icall (mb, mono_gc_alloc_string);
1354 g_assert_not_reached ();
1357 /* if (ret == NULL) throw OOM; */
1358 mono_mb_emit_byte (mb, CEE_DUP);
1359 no_oom_branch = mono_mb_emit_branch (mb, CEE_BRTRUE);
1360 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1362 mono_mb_patch_branch (mb, no_oom_branch);
1363 mono_mb_emit_byte (mb, CEE_RET);
1366 mono_mb_patch_short_branch (mb, fastpath_branch);
1368 /* FIXME: Memory barrier */
1370 /* tlab_next = new_next */
1371 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1372 mono_mb_emit_ldloc (mb, new_next_var);
1373 mono_mb_emit_byte (mb, CEE_STIND_I);
1376 mono_mb_emit_ldloc (mb, p_var);
1377 mono_mb_emit_ldarg (mb, 0);
1378 mono_mb_emit_byte (mb, CEE_STIND_I);
1380 /* mark object end with nursery word */
1381 if (nursery_canaries_enabled ()) {
1382 mono_mb_emit_ldloc (mb, p_var);
1383 mono_mb_emit_ldloc (mb, real_size_var);
1384 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1385 mono_mb_emit_icon8 (mb, (mword) CANARY_STRING);
1386 mono_mb_emit_icon (mb, CANARY_SIZE);
1387 mono_mb_emit_byte (mb, MONO_CEE_PREFIX1);
1388 mono_mb_emit_byte (mb, CEE_CPBLK);
1391 if (atype == ATYPE_VECTOR) {
1392 /* arr->max_length = max_length; */
1393 mono_mb_emit_ldloc (mb, p_var);
1394 mono_mb_emit_ldflda (mb, MONO_STRUCT_OFFSET (MonoArray, max_length));
1395 mono_mb_emit_ldarg (mb, 1);
1396 #ifdef MONO_BIG_ARRAYS
1397 mono_mb_emit_byte (mb, CEE_STIND_I);
1399 mono_mb_emit_byte (mb, CEE_STIND_I4);
1401 } else if (atype == ATYPE_STRING) {
1402 /* need to set length and clear the last char */
1403 /* s->length = len; */
1404 mono_mb_emit_ldloc (mb, p_var);
1405 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, length));
1406 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1407 mono_mb_emit_ldarg (mb, 1);
1408 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
1411 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1412 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1413 mono_mb_emit_byte (mb, CEE_LDC_I4_0);
1414 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1415 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1417 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1418 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1421 We must make sure both vtable and max_length are globaly visible before returning to managed land.
1423 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1426 mono_mb_emit_ldloc (mb, p_var);
1429 mono_mb_emit_byte (mb, CEE_RET);
1432 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
1433 info->d.alloc.gc_name = "sgen";
1434 info->d.alloc.alloc_type = atype;
1437 mb->init_locals = FALSE;
1440 res = mono_mb_create (mb, csig, 8, info);
1449 mono_gc_get_aligned_size_for_allocator (int size)
1451 return SGEN_ALIGN_UP (size);
1455 * Generate an allocator method implementing the fast path of mono_gc_alloc_obj ().
1456 * The signature of the called method is:
1457 * object allocate (MonoVTable *vtable)
1460 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box, gboolean known_instance_size)
1462 #ifdef MANAGED_ALLOCATION
1463 if (collect_before_allocs)
1465 if (klass->instance_size > tlab_size)
1467 if (known_instance_size && ALIGN_TO (klass->instance_size, SGEN_ALLOC_ALIGN) >= SGEN_MAX_SMALL_OBJ_SIZE)
1469 if (mono_class_has_finalizer (klass) || mono_class_is_marshalbyref (klass))
1473 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1475 if (klass->byval_arg.type == MONO_TYPE_STRING)
1476 return mono_gc_get_managed_allocator_by_type (ATYPE_STRING, MANAGED_ALLOCATOR_REGULAR);
1477 /* Generic classes have dynamic field and can go above MAX_SMALL_OBJ_SIZE. */
1478 if (known_instance_size)
1479 return mono_gc_get_managed_allocator_by_type (ATYPE_SMALL, MANAGED_ALLOCATOR_REGULAR);
1481 return mono_gc_get_managed_allocator_by_type (ATYPE_NORMAL, MANAGED_ALLOCATOR_REGULAR);
1488 mono_gc_get_managed_array_allocator (MonoClass *klass)
1490 #ifdef MANAGED_ALLOCATION
1491 if (klass->rank != 1)
1493 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1495 if (has_per_allocation_action)
1497 g_assert (!mono_class_has_finalizer (klass) && !mono_class_is_marshalbyref (klass));
1499 return mono_gc_get_managed_allocator_by_type (ATYPE_VECTOR, MANAGED_ALLOCATOR_REGULAR);
1506 sgen_set_use_managed_allocator (gboolean flag)
1508 use_managed_allocator = flag;
1512 mono_gc_get_managed_allocator_by_type (int atype, ManagedAllocatorVariant variant)
1514 #ifdef MANAGED_ALLOCATION
1518 if (variant == MANAGED_ALLOCATOR_REGULAR && !use_managed_allocator)
1522 case MANAGED_ALLOCATOR_REGULAR: cache = alloc_method_cache; break;
1523 case MANAGED_ALLOCATOR_SLOW_PATH: cache = slowpath_alloc_method_cache; break;
1524 default: g_assert_not_reached (); break;
1527 res = cache [atype];
1531 res = create_allocator (atype, variant);
1533 if (cache [atype]) {
1534 mono_free_method (res);
1535 res = cache [atype];
1537 mono_memory_barrier ();
1538 cache [atype] = res;
1549 mono_gc_get_managed_allocator_types (void)
1555 sgen_is_managed_allocator (MonoMethod *method)
1559 for (i = 0; i < ATYPE_NUM; ++i)
1560 if (method == alloc_method_cache [i] || method == slowpath_alloc_method_cache [i])
1566 sgen_has_managed_allocator (void)
1570 for (i = 0; i < ATYPE_NUM; ++i)
1571 if (alloc_method_cache [i] || slowpath_alloc_method_cache [i])
1576 #define ARRAY_OBJ_INDEX(ptr,array,elem_size) (((char*)(ptr) - ((char*)(array) + G_STRUCT_OFFSET (MonoArray, vector))) / (elem_size))
1579 sgen_client_cardtable_scan_object (GCObject *obj, guint8 *cards, ScanCopyContext ctx)
1581 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
1582 MonoClass *klass = vt->klass;
1584 SGEN_ASSERT (0, SGEN_VTABLE_HAS_REFERENCES (vt), "Why would we ever call this on reference-free objects?");
1587 MonoArray *arr = (MonoArray*)obj;
1588 guint8 *card_data, *card_base;
1589 guint8 *card_data_end;
1590 char *obj_start = (char *)sgen_card_table_align_pointer (obj);
1592 mword obj_size = sgen_mono_array_size (vt, arr, &bounds_size, sgen_vtable_get_descriptor (vt));
1593 /* We don't want to scan the bounds entries at the end of multidimensional arrays */
1594 char *obj_end = (char*)obj + obj_size - bounds_size;
1596 size_t extra_idx = 0;
1598 mword desc = (mword)klass->element_class->gc_descr;
1599 int elem_size = mono_array_element_size (klass);
1601 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1602 guint8 *overflow_scan_end = NULL;
1605 #ifdef SGEN_OBJECT_LAYOUT_STATISTICS
1606 if (klass->element_class->valuetype)
1607 sgen_object_layout_scanned_vtype_array ();
1609 sgen_object_layout_scanned_ref_array ();
1615 card_data = sgen_card_table_get_card_scan_address ((mword)obj);
1617 card_base = card_data;
1618 card_count = sgen_card_table_number_of_cards_in_range ((mword)obj, obj_size);
1619 card_data_end = card_data + card_count;
1622 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1623 /*Check for overflow and if so, setup to scan in two steps*/
1624 if (!cards && card_data_end >= SGEN_SHADOW_CARDTABLE_END) {
1625 overflow_scan_end = sgen_shadow_cardtable + (card_data_end - SGEN_SHADOW_CARDTABLE_END);
1626 card_data_end = SGEN_SHADOW_CARDTABLE_END;
1632 card_data = sgen_find_next_card (card_data, card_data_end);
1633 for (; card_data < card_data_end; card_data = sgen_find_next_card (card_data + 1, card_data_end)) {
1635 size_t idx = (card_data - card_base) + extra_idx;
1636 char *start = (char*)(obj_start + idx * CARD_SIZE_IN_BYTES);
1637 char *card_end = start + CARD_SIZE_IN_BYTES;
1638 char *first_elem, *elem;
1640 HEAVY_STAT (++los_marked_cards);
1643 sgen_card_table_prepare_card_for_scanning (card_data);
1645 card_end = MIN (card_end, obj_end);
1647 if (start <= (char*)arr->vector)
1650 index = ARRAY_OBJ_INDEX (start, obj, elem_size);
1652 elem = first_elem = (char*)mono_array_addr_with_size_fast ((MonoArray*)obj, elem_size, index);
1653 if (klass->element_class->valuetype) {
1654 ScanVTypeFunc scan_vtype_func = ctx.ops->scan_vtype;
1656 for (; elem < card_end; elem += elem_size)
1657 scan_vtype_func (obj, elem, desc, ctx.queue BINARY_PROTOCOL_ARG (elem_size));
1659 ScanPtrFieldFunc scan_ptr_field_func = ctx.ops->scan_ptr_field;
1661 HEAVY_STAT (++los_array_cards);
1662 for (; elem < card_end; elem += SIZEOF_VOID_P)
1663 scan_ptr_field_func (obj, (GCObject**)elem, ctx.queue);
1666 binary_protocol_card_scan (first_elem, elem - first_elem);
1669 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1670 if (overflow_scan_end) {
1671 extra_idx = card_data - card_base;
1672 card_base = card_data = sgen_shadow_cardtable;
1673 card_data_end = overflow_scan_end;
1674 overflow_scan_end = NULL;
1685 * Array and string allocation
1689 mono_gc_alloc_vector (MonoVTable *vtable, size_t size, uintptr_t max_length)
1694 if (!SGEN_CAN_ALIGN_UP (size))
1697 #ifndef DISABLE_CRITICAL_REGION
1698 ENTER_CRITICAL_REGION;
1699 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1701 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1702 arr->max_length = (mono_array_size_t)max_length;
1703 EXIT_CRITICAL_REGION;
1706 EXIT_CRITICAL_REGION;
1711 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1712 if (G_UNLIKELY (!arr)) {
1717 arr->max_length = (mono_array_size_t)max_length;
1722 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1723 mono_profiler_allocation (&arr->obj);
1725 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Vector has incorrect size.");
1730 mono_gc_alloc_array (MonoVTable *vtable, size_t size, uintptr_t max_length, uintptr_t bounds_size)
1733 MonoArrayBounds *bounds;
1736 if (!SGEN_CAN_ALIGN_UP (size))
1739 #ifndef DISABLE_CRITICAL_REGION
1740 ENTER_CRITICAL_REGION;
1741 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1743 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1744 arr->max_length = (mono_array_size_t)max_length;
1746 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1747 arr->bounds = bounds;
1748 EXIT_CRITICAL_REGION;
1751 EXIT_CRITICAL_REGION;
1756 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1757 if (G_UNLIKELY (!arr)) {
1762 arr->max_length = (mono_array_size_t)max_length;
1764 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1765 arr->bounds = bounds;
1770 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1771 mono_profiler_allocation (&arr->obj);
1773 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Array has incorrect size.");
1778 mono_gc_alloc_string (MonoVTable *vtable, size_t size, gint32 len)
1783 if (!SGEN_CAN_ALIGN_UP (size))
1786 #ifndef DISABLE_CRITICAL_REGION
1787 ENTER_CRITICAL_REGION;
1788 str = (MonoString*)sgen_try_alloc_obj_nolock (vtable, size);
1790 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1792 EXIT_CRITICAL_REGION;
1795 EXIT_CRITICAL_REGION;
1800 str = (MonoString*)sgen_alloc_obj_nolock (vtable, size);
1801 if (G_UNLIKELY (!str)) {
1811 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1812 mono_profiler_allocation (&str->object);
1822 mono_gc_set_string_length (MonoString *str, gint32 new_length)
1824 mono_unichar2 *new_end = str->chars + new_length;
1826 /* zero the discarded string. This null-delimits the string and allows
1827 * the space to be reclaimed by SGen. */
1829 if (nursery_canaries_enabled () && sgen_ptr_in_nursery (str)) {
1830 CHECK_CANARY_FOR_OBJECT ((GCObject*)str, TRUE);
1831 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2) + CANARY_SIZE);
1832 memcpy (new_end + 1 , CANARY_STRING, CANARY_SIZE);
1834 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2));
1837 str->length = new_length;
1844 #define GC_ROOT_NUM 32
1846 int count; /* must be the first field */
1847 void *objects [GC_ROOT_NUM];
1848 int root_types [GC_ROOT_NUM];
1849 uintptr_t extra_info [GC_ROOT_NUM];
1853 notify_gc_roots (GCRootReport *report)
1857 mono_profiler_gc_roots (report->count, report->objects, report->root_types, report->extra_info);
1862 add_profile_gc_root (GCRootReport *report, void *object, int rtype, uintptr_t extra_info)
1864 if (report->count == GC_ROOT_NUM)
1865 notify_gc_roots (report);
1866 report->objects [report->count] = object;
1867 report->root_types [report->count] = rtype;
1868 report->extra_info [report->count++] = (uintptr_t)SGEN_LOAD_VTABLE (object)->klass;
1872 sgen_client_nursery_objects_pinned (void **definitely_pinned, int count)
1874 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS) {
1875 GCRootReport report;
1878 for (idx = 0; idx < count; ++idx)
1879 add_profile_gc_root (&report, definitely_pinned [idx], MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
1880 notify_gc_roots (&report);
1885 report_finalizer_roots_from_queue (SgenPointerQueue *queue)
1887 GCRootReport report;
1891 for (i = 0; i < queue->next_slot; ++i) {
1892 void *obj = queue->data [i];
1895 add_profile_gc_root (&report, obj, MONO_PROFILE_GC_ROOT_FINALIZER, 0);
1897 notify_gc_roots (&report);
1901 report_finalizer_roots (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
1903 report_finalizer_roots_from_queue (fin_ready_queue);
1904 report_finalizer_roots_from_queue (critical_fin_queue);
1907 static GCRootReport *root_report;
1910 single_arg_report_root (MonoObject **obj, void *gc_data)
1913 add_profile_gc_root (root_report, *obj, MONO_PROFILE_GC_ROOT_OTHER, 0);
1917 precisely_report_roots_from (GCRootReport *report, void** start_root, void** end_root, mword desc)
1919 switch (desc & ROOT_DESC_TYPE_MASK) {
1920 case ROOT_DESC_BITMAP:
1921 desc >>= ROOT_DESC_TYPE_SHIFT;
1923 if ((desc & 1) && *start_root) {
1924 add_profile_gc_root (report, *start_root, MONO_PROFILE_GC_ROOT_OTHER, 0);
1930 case ROOT_DESC_COMPLEX: {
1931 gsize *bitmap_data = (gsize *)sgen_get_complex_descriptor_bitmap (desc);
1932 gsize bwords = (*bitmap_data) - 1;
1933 void **start_run = start_root;
1935 while (bwords-- > 0) {
1936 gsize bmap = *bitmap_data++;
1937 void **objptr = start_run;
1939 if ((bmap & 1) && *objptr) {
1940 add_profile_gc_root (report, *objptr, MONO_PROFILE_GC_ROOT_OTHER, 0);
1945 start_run += GC_BITS_PER_WORD;
1949 case ROOT_DESC_VECTOR: {
1952 for (p = start_root; p < end_root; p++) {
1954 add_profile_gc_root (report, *p, MONO_PROFILE_GC_ROOT_OTHER, 0);
1958 case ROOT_DESC_USER: {
1959 MonoGCRootMarkFunc marker = (MonoGCRootMarkFunc)sgen_get_user_descriptor_func (desc);
1960 root_report = report;
1961 marker ((MonoObject**)start_root, single_arg_report_root, NULL);
1964 case ROOT_DESC_RUN_LEN:
1965 g_assert_not_reached ();
1967 g_assert_not_reached ();
1972 report_registered_roots_by_type (int root_type)
1974 GCRootReport report;
1978 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], void **, start_root, RootRecord *, root) {
1979 SGEN_LOG (6, "Precise root scan %p-%p (desc: %p)", start_root, root->end_root, (void*)root->root_desc);
1980 precisely_report_roots_from (&report, start_root, (void**)root->end_root, root->root_desc);
1981 } SGEN_HASH_TABLE_FOREACH_END;
1982 notify_gc_roots (&report);
1986 report_registered_roots (void)
1988 report_registered_roots_by_type (ROOT_TYPE_NORMAL);
1989 report_registered_roots_by_type (ROOT_TYPE_WBARRIER);
1993 sgen_client_collecting_minor (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
1995 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
1996 report_registered_roots ();
1997 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
1998 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2001 static GCRootReport major_root_report;
2002 static gboolean profile_roots;
2005 sgen_client_collecting_major_1 (void)
2007 profile_roots = mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS;
2008 memset (&major_root_report, 0, sizeof (GCRootReport));
2012 sgen_client_pinned_los_object (GCObject *obj)
2015 add_profile_gc_root (&major_root_report, (char*)obj, MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
2019 sgen_client_collecting_major_2 (void)
2022 notify_gc_roots (&major_root_report);
2024 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2025 report_registered_roots ();
2029 sgen_client_collecting_major_3 (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2031 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2032 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2035 #define MOVED_OBJECTS_NUM 64
2036 static void *moved_objects [MOVED_OBJECTS_NUM];
2037 static int moved_objects_idx = 0;
2039 static SgenPointerQueue moved_objects_queue = SGEN_POINTER_QUEUE_INIT (INTERNAL_MEM_MOVED_OBJECT);
2042 mono_sgen_register_moved_object (void *obj, void *destination)
2045 * This function can be called from SGen's worker threads. We want to try
2046 * and avoid exposing those threads to the profiler API, so queue up move
2047 * events and send them later when the main GC thread calls
2048 * mono_sgen_gc_event_moves ().
2050 * TODO: Once SGen has multiple worker threads, we need to switch to a
2051 * lock-free data structure for the queue as multiple threads will be
2052 * adding to it at the same time.
2054 if (sgen_thread_pool_is_thread_pool_thread (mono_native_thread_id_get ())) {
2055 sgen_pointer_queue_add (&moved_objects_queue, obj);
2056 sgen_pointer_queue_add (&moved_objects_queue, destination);
2058 if (moved_objects_idx == MOVED_OBJECTS_NUM) {
2059 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2060 moved_objects_idx = 0;
2063 moved_objects [moved_objects_idx++] = obj;
2064 moved_objects [moved_objects_idx++] = destination;
2069 mono_sgen_gc_event_moves (void)
2071 while (!sgen_pointer_queue_is_empty (&moved_objects_queue)) {
2072 void *dst = sgen_pointer_queue_pop (&moved_objects_queue);
2073 void *src = sgen_pointer_queue_pop (&moved_objects_queue);
2075 mono_sgen_register_moved_object (src, dst);
2078 if (moved_objects_idx) {
2079 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2080 moved_objects_idx = 0;
2088 #define REFS_SIZE 128
2091 MonoGCReferences callback;
2095 MonoObject *refs [REFS_SIZE];
2096 uintptr_t offsets [REFS_SIZE];
2100 #define HANDLE_PTR(ptr,obj) do { \
2102 if (hwi->count == REFS_SIZE) { \
2103 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data); \
2107 hwi->offsets [hwi->count] = (char*)(ptr)-(char*)start; \
2108 hwi->refs [hwi->count++] = *(ptr); \
2113 collect_references (HeapWalkInfo *hwi, GCObject *obj, size_t size)
2115 char *start = (char*)obj;
2116 mword desc = sgen_obj_get_descriptor (obj);
2118 #include "sgen/sgen-scan-object.h"
2122 walk_references (GCObject *start, size_t size, void *data)
2124 HeapWalkInfo *hwi = (HeapWalkInfo *)data;
2127 collect_references (hwi, start, size);
2128 if (hwi->count || !hwi->called)
2129 hwi->callback (start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data);
2133 * mono_gc_walk_heap:
2134 * \param flags flags for future use
2135 * \param callback a function pointer called for each object in the heap
2136 * \param data a user data pointer that is passed to callback
2137 * This function can be used to iterate over all the live objects in the heap:
2138 * for each object, \p callback is invoked, providing info about the object's
2139 * location in memory, its class, its size and the objects it references.
2140 * For each referenced object it's offset from the object address is
2141 * reported in the offsets array.
2142 * The object references may be buffered, so the callback may be invoked
2143 * multiple times for the same object: in all but the first call, the size
2144 * argument will be zero.
2145 * Note that this function can be only called in the \c MONO_GC_EVENT_PRE_START_WORLD
2146 * profiler event handler.
2147 * \returns a non-zero value if the GC doesn't support heap walking
2150 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
2155 hwi.callback = callback;
2158 sgen_clear_nursery_fragments ();
2159 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data, walk_references, &hwi, FALSE, TRUE);
2161 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, walk_references, &hwi);
2162 sgen_los_iterate_objects (walk_references, &hwi);
2172 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
2174 gc_callbacks = *callbacks;
2178 mono_gc_get_gc_callbacks ()
2180 return &gc_callbacks;
2184 sgen_client_thread_register (SgenThreadInfo* info, void *stack_bottom_fallback)
2187 guint8 *staddr = NULL;
2189 mono_tls_set_sgen_thread_info (info);
2191 info->client_info.skip = 0;
2193 info->client_info.stack_start = NULL;
2195 #ifdef SGEN_POSIX_STW
2196 info->client_info.stop_count = -1;
2197 info->client_info.signal = 0;
2200 mono_thread_info_get_stack_bounds (&staddr, &stsize);
2202 info->client_info.stack_start_limit = staddr;
2203 info->client_info.stack_end = staddr + stsize;
2205 gsize stack_bottom = (gsize)stack_bottom_fallback;
2206 stack_bottom += 4095;
2207 stack_bottom &= ~4095;
2208 info->client_info.stack_end = (char*)stack_bottom;
2211 memset (&info->client_info.ctx, 0, sizeof (MonoContext));
2213 if (mono_gc_get_gc_callbacks ()->thread_attach_func)
2214 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2216 binary_protocol_thread_register ((gpointer)mono_thread_info_get_tid (info));
2218 SGEN_LOG (3, "registered thread %p (%p) stack end %p", info, (gpointer)mono_thread_info_get_tid (info), info->client_info.stack_end);
2220 info->client_info.info.handle_stack = mono_handle_stack_alloc ();
2224 sgen_client_thread_unregister (SgenThreadInfo *p)
2226 MonoNativeThreadId tid;
2228 mono_tls_set_sgen_thread_info (NULL);
2230 tid = mono_thread_info_get_tid (p);
2232 if (p->client_info.info.runtime_thread)
2233 mono_threads_add_joinable_thread ((gpointer)tid);
2235 if (mono_gc_get_gc_callbacks ()->thread_detach_func) {
2236 mono_gc_get_gc_callbacks ()->thread_detach_func (p->client_info.runtime_data);
2237 p->client_info.runtime_data = NULL;
2240 binary_protocol_thread_unregister ((gpointer)tid);
2241 SGEN_LOG (3, "unregister thread %p (%p)", p, (gpointer)tid);
2243 HandleStack *handles = (HandleStack*) p->client_info.info.handle_stack;
2244 p->client_info.info.handle_stack = NULL;
2245 mono_handle_stack_free (handles);
2249 mono_gc_set_skip_thread (gboolean skip)
2251 SgenThreadInfo *info = mono_thread_info_current ();
2254 info->client_info.gc_disabled = skip;
2258 /* If we skip scanning a thread with a non-empty handle stack, we may move an
2259 * object but fail to update the reference in the handle.
2261 HandleStack *stack = info->client_info.info.handle_stack;
2262 g_assert (stack == NULL || mono_handle_stack_is_empty (stack));
2267 thread_in_critical_region (SgenThreadInfo *info)
2269 return info->client_info.in_critical_region;
2273 sgen_thread_attach (SgenThreadInfo *info)
2275 if (mono_gc_get_gc_callbacks ()->thread_attach_func && !info->client_info.runtime_data)
2276 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2280 sgen_thread_detach (SgenThreadInfo *p)
2282 /* If a delegate is passed to native code and invoked on a thread we dont
2283 * know about, marshal will register it with mono_threads_attach_coop, but
2284 * we have no way of knowing when that thread goes away. SGen has a TSD
2285 * so we assume that if the domain is still registered, we can detach
2288 if (mono_thread_internal_current_is_attached ())
2289 mono_thread_detach_internal (mono_thread_internal_current ());
2293 mono_gc_register_thread (void *baseptr)
2295 return mono_thread_info_attach (baseptr) != NULL;
2299 mono_gc_is_gc_thread (void)
2303 result = mono_thread_info_current () != NULL;
2309 sgen_client_thread_register_worker (void)
2311 mono_thread_info_register_small_id ();
2312 mono_native_thread_set_name (mono_native_thread_id_get (), "SGen worker");
2315 /* Variables holding start/end nursery so it won't have to be passed at every call */
2316 static void *scan_area_arg_start, *scan_area_arg_end;
2319 mono_gc_conservatively_scan_area (void *start, void *end)
2321 sgen_conservatively_pin_objects_from ((void **)start, (void **)end, scan_area_arg_start, scan_area_arg_end, PIN_TYPE_STACK);
2325 mono_gc_scan_object (void *obj, void *gc_data)
2327 ScanCopyContext *ctx = (ScanCopyContext *)gc_data;
2328 ctx->ops->copy_or_mark_object ((GCObject**)&obj, ctx->queue);
2333 void **start_nursery;
2335 } PinHandleStackInteriorPtrData;
2337 /* Called when we're scanning the handle stack imprecisely and we encounter a pointer into the
2338 middle of an object.
2341 pin_handle_stack_interior_ptrs (void **ptr_slot, void *user_data)
2343 PinHandleStackInteriorPtrData *ud = (PinHandleStackInteriorPtrData *)user_data;
2344 sgen_conservatively_pin_objects_from (ptr_slot, ptr_slot+1, ud->start_nursery, ud->end_nursery, PIN_TYPE_STACK);
2349 * Mark from thread stacks and registers.
2352 sgen_client_scan_thread_data (void *start_nursery, void *end_nursery, gboolean precise, ScanCopyContext ctx)
2354 scan_area_arg_start = start_nursery;
2355 scan_area_arg_end = end_nursery;
2357 FOREACH_THREAD (info) {
2358 int skip_reason = 0;
2359 void *aligned_stack_start;
2361 if (info->client_info.skip) {
2362 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);
2364 } else if (info->client_info.gc_disabled) {
2365 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);
2367 } else if (!mono_thread_info_is_live (info)) {
2368 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);
2370 } else if (!info->client_info.stack_start) {
2371 SGEN_LOG (3, "Skipping starting or detaching thread %p", info);
2375 binary_protocol_scan_stack ((gpointer)mono_thread_info_get_tid (info), info->client_info.stack_start, info->client_info.stack_end, skip_reason);
2379 /* If we skip a thread with a non-empty handle stack and then it
2380 * resumes running we may potentially move an object but fail to
2381 * update the reference in the handle.
2383 HandleStack *stack = info->client_info.info.handle_stack;
2384 g_assert (stack == NULL || mono_handle_stack_is_empty (stack));
2389 g_assert (info->client_info.stack_start);
2390 g_assert (info->client_info.stack_end);
2392 aligned_stack_start = (void*)(mword) ALIGN_TO ((mword)info->client_info.stack_start, SIZEOF_VOID_P);
2394 /* Windows uses a guard page before the committed stack memory pages to detect when the
2395 stack needs to be grown. If we suspend a thread just after a function prolog has
2396 decremented the stack pointer to point into the guard page but before the thread has
2397 been able to read or write to that page, starting the stack scan at aligned_stack_start
2398 will raise a STATUS_GUARD_PAGE_VIOLATION and the process will crash. This code uses
2399 VirtualQuery() to determine whether stack_start points into the guard page and then
2400 updates aligned_stack_start to point at the next non-guard page. */
2401 MEMORY_BASIC_INFORMATION mem_info;
2402 SIZE_T result = VirtualQuery(info->client_info.stack_start, &mem_info, sizeof(mem_info));
2403 g_assert (result != 0);
2404 if (mem_info.Protect & PAGE_GUARD) {
2405 aligned_stack_start = ((char*) mem_info.BaseAddress) + mem_info.RegionSize;
2409 g_assert (info->client_info.suspend_done);
2410 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 ());
2411 if (mono_gc_get_gc_callbacks ()->thread_mark_func && !conservative_stack_mark) {
2412 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);
2413 } else if (!precise) {
2414 if (!conservative_stack_mark) {
2415 fprintf (stderr, "Precise stack mark not supported - disabling.\n");
2416 conservative_stack_mark = TRUE;
2418 //FIXME we should eventually use the new stack_mark from coop
2419 sgen_conservatively_pin_objects_from ((void **)aligned_stack_start, (void **)info->client_info.stack_end, start_nursery, end_nursery, PIN_TYPE_STACK);
2423 sgen_conservatively_pin_objects_from ((void**)&info->client_info.ctx, (void**)(&info->client_info.ctx + 1),
2424 start_nursery, end_nursery, PIN_TYPE_STACK);
2427 // This is used on Coop GC for platforms where we cannot get the data for individual registers.
2428 // We force a spill of all registers into the stack and pass a chunk of data into sgen.
2429 //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
2430 MonoThreadUnwindState *state = &info->client_info.info.thread_saved_state [SELF_SUSPEND_STATE_INDEX];
2431 if (state && state->gc_stackdata) {
2432 sgen_conservatively_pin_objects_from ((void **)state->gc_stackdata, (void**)((char*)state->gc_stackdata + state->gc_stackdata_size),
2433 start_nursery, end_nursery, PIN_TYPE_STACK);
2437 if (info->client_info.info.handle_stack) {
2439 Make two passes over the handle stack. On the imprecise pass, pin all
2440 objects where the handle points into the interior of the object. On the
2441 precise pass, copy or mark all the objects that have handles to the
2442 beginning of the object.
2445 mono_handle_stack_scan ((HandleStack*)info->client_info.info.handle_stack, (GcScanFunc)ctx.ops->copy_or_mark_object, ctx.queue, precise);
2447 PinHandleStackInteriorPtrData ud = { .start_nursery = start_nursery,
2448 .end_nursery = end_nursery,
2450 mono_handle_stack_scan ((HandleStack*)info->client_info.info.handle_stack, pin_handle_stack_interior_ptrs, &ud, precise);
2453 } FOREACH_THREAD_END
2457 * mono_gc_set_stack_end:
2459 * Set the end of the current threads stack to STACK_END. The stack space between
2460 * STACK_END and the real end of the threads stack will not be scanned during collections.
2463 mono_gc_set_stack_end (void *stack_end)
2465 SgenThreadInfo *info;
2468 info = mono_thread_info_current ();
2470 SGEN_ASSERT (0, stack_end < info->client_info.stack_end, "Can only lower stack end");
2471 info->client_info.stack_end = stack_end;
2481 mono_gc_register_root (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2483 return sgen_register_root (start, size, descr, descr ? ROOT_TYPE_NORMAL : ROOT_TYPE_PINNED, source, msg);
2487 mono_gc_register_root_wbarrier (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2489 return sgen_register_root (start, size, descr, ROOT_TYPE_WBARRIER, source, msg);
2493 mono_gc_deregister_root (char* addr)
2495 sgen_deregister_root (addr);
2504 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
2508 mono_threads_join_lock ();
2509 res = pthread_create (new_thread, attr, start_routine, arg);
2510 mono_threads_join_unlock ();
2521 sgen_client_total_allocated_heap_changed (size_t allocated_heap)
2523 mono_runtime_resource_check_limit (MONO_RESOURCE_GC_HEAP, allocated_heap);
2527 mono_gc_user_markers_supported (void)
2533 mono_object_is_alive (MonoObject* o)
2539 mono_gc_get_generation (MonoObject *obj)
2541 if (sgen_ptr_in_nursery (obj))
2547 mono_gc_get_gc_name (void)
2553 mono_gc_get_description (void)
2555 #ifdef HAVE_CONC_GC_AS_DEFAULT
2556 return g_strdup ("sgen (concurrent by default)");
2558 return g_strdup ("sgen");
2563 mono_gc_set_desktop_mode (void)
2568 mono_gc_is_moving (void)
2574 mono_gc_is_disabled (void)
2580 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
2587 mono_gc_max_generation (void)
2593 mono_gc_precise_stack_mark_enabled (void)
2595 return !conservative_stack_mark;
2599 mono_gc_collect (int generation)
2601 sgen_gc_collect (generation);
2605 mono_gc_collection_count (int generation)
2607 return sgen_gc_collection_count (generation);
2611 mono_gc_get_used_size (void)
2613 return (int64_t)sgen_gc_get_used_size ();
2617 mono_gc_get_heap_size (void)
2619 return (int64_t)sgen_gc_get_total_heap_allocation ();
2623 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
2625 return sgen_make_user_root_descriptor (marker);
2629 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
2631 return SGEN_DESC_STRING;
2635 mono_gc_get_nursery (int *shift_bits, size_t *size)
2637 *size = sgen_nursery_size;
2638 *shift_bits = DEFAULT_NURSERY_BITS;
2639 return sgen_get_nursery_start ();
2643 mono_gc_get_los_limit (void)
2645 return SGEN_MAX_SMALL_OBJ_SIZE;
2649 sgen_client_default_metadata (void)
2651 return mono_domain_get ();
2655 sgen_client_metadata_for_object (GCObject *obj)
2657 return mono_object_domain (obj);
2661 * mono_gchandle_is_in_domain:
2662 * \param gchandle a GCHandle's handle.
2663 * \param domain An application domain.
2664 * \returns TRUE if the object wrapped by the \p gchandle belongs to the specific \p domain.
2667 mono_gchandle_is_in_domain (guint32 gchandle, MonoDomain *domain)
2669 MonoDomain *gchandle_domain = (MonoDomain *)sgen_gchandle_get_metadata (gchandle);
2670 return domain->domain_id == gchandle_domain->domain_id;
2674 * mono_gchandle_free_domain:
2675 * \param unloading domain that is unloading
2677 * Function used internally to cleanup any GC handle for objects belonging
2678 * to the specified domain during appdomain unload.
2681 mono_gchandle_free_domain (MonoDomain *unloading)
2686 null_link_if_in_domain (gpointer hidden, GCHandleType handle_type, int max_generation, gpointer user)
2688 MonoDomain *unloading_domain = (MonoDomain *)user;
2689 MonoDomain *obj_domain;
2690 gboolean is_weak = MONO_GC_HANDLE_TYPE_IS_WEAK (handle_type);
2691 if (MONO_GC_HANDLE_IS_OBJECT_POINTER (hidden)) {
2692 MonoObject *obj = (MonoObject *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2693 obj_domain = mono_object_domain (obj);
2695 obj_domain = (MonoDomain *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2697 if (unloading_domain->domain_id == obj_domain->domain_id)
2703 sgen_null_links_for_domain (MonoDomain *domain)
2706 for (type = HANDLE_TYPE_MIN; type < HANDLE_TYPE_MAX; ++type)
2707 sgen_gchandle_iterate ((GCHandleType)type, GENERATION_OLD, null_link_if_in_domain, domain);
2711 mono_gchandle_set_target (guint32 gchandle, MonoObject *obj)
2713 sgen_gchandle_set_target (gchandle, obj);
2717 sgen_client_gchandle_created (int handle_type, GCObject *obj, guint32 handle)
2719 #ifndef DISABLE_PERFCOUNTERS
2720 mono_perfcounters->gc_num_handles++;
2722 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_CREATED, handle_type, handle, obj);
2726 sgen_client_gchandle_destroyed (int handle_type, guint32 handle)
2728 #ifndef DISABLE_PERFCOUNTERS
2729 mono_perfcounters->gc_num_handles--;
2731 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_DESTROYED, handle_type, handle, NULL);
2735 sgen_client_ensure_weak_gchandles_accessible (void)
2738 * During the second bridge processing step the world is
2739 * running again. That step processes all weak links once
2740 * more to null those that refer to dead objects. Before that
2741 * is completed, those links must not be followed, so we
2742 * conservatively wait for bridge processing when any weak
2743 * link is dereferenced.
2745 /* FIXME: A GC can occur after this check fails, in which case we
2746 * should wait for bridge processing but would fail to do so.
2748 if (G_UNLIKELY (bridge_processing_in_progress))
2749 mono_gc_wait_for_bridge_processing ();
2753 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
2757 result = func (data);
2758 UNLOCK_INTERRUPTION;
2763 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
2769 mono_gc_get_card_table (int *shift_bits, gpointer *mask)
2771 return sgen_get_card_table_configuration (shift_bits, mask);
2775 mono_gc_card_table_nursery_check (void)
2777 return !sgen_get_major_collector ()->is_concurrent;
2780 /* Negative value to remove */
2782 mono_gc_add_memory_pressure (gint64 value)
2784 /* FIXME: Implement at some point? */
2792 sgen_client_degraded_allocation (size_t size)
2794 static int last_major_gc_warned = -1;
2795 static int num_degraded = 0;
2797 if (last_major_gc_warned < (int)gc_stats.major_gc_count) {
2799 if (num_degraded == 1 || num_degraded == 3)
2800 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Degraded allocation. Consider increasing nursery-size if the warning persists.");
2801 else if (num_degraded == 10)
2802 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Repeated degraded allocation. Consider increasing nursery-size.");
2803 last_major_gc_warned = gc_stats.major_gc_count;
2812 sgen_client_description_for_internal_mem_type (int type)
2815 case INTERNAL_MEM_EPHEMERON_LINK: return "ephemeron-link";
2816 case INTERNAL_MEM_MOVED_OBJECT: return "moved-object";
2823 sgen_client_pre_collection_checks (void)
2825 if (sgen_mono_xdomain_checks) {
2826 sgen_clear_nursery_fragments ();
2827 sgen_check_for_xdomain_refs ();
2832 sgen_client_vtable_is_inited (MonoVTable *vt)
2834 return vt->klass->inited;
2838 sgen_client_vtable_get_namespace (MonoVTable *vt)
2840 return vt->klass->name_space;
2844 sgen_client_vtable_get_name (MonoVTable *vt)
2846 return vt->klass->name;
2854 sgen_client_init (void)
2857 MonoThreadInfoCallbacks cb;
2859 cb.thread_register = sgen_thread_register;
2860 cb.thread_detach = sgen_thread_detach;
2861 cb.thread_unregister = sgen_thread_unregister;
2862 cb.thread_attach = sgen_thread_attach;
2863 cb.mono_thread_in_critical_region = thread_in_critical_region;
2864 cb.ip_in_critical_region = ip_in_critical_region;
2866 mono_threads_init (&cb, sizeof (SgenThreadInfo));
2868 ///* Keep this the default for now */
2869 /* Precise marking is broken on all supported targets. Disable until fixed. */
2870 conservative_stack_mark = TRUE;
2872 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_EPHEMERON_LINK, sizeof (EphemeronLinkNode));
2874 mono_sgen_init_stw ();
2876 mono_tls_init_gc_keys ();
2878 mono_gc_register_thread (&dummy);
2882 sgen_client_handle_gc_param (const char *opt)
2884 if (g_str_has_prefix (opt, "stack-mark=")) {
2885 opt = strchr (opt, '=') + 1;
2886 if (!strcmp (opt, "precise")) {
2887 conservative_stack_mark = FALSE;
2888 } else if (!strcmp (opt, "conservative")) {
2889 conservative_stack_mark = TRUE;
2891 sgen_env_var_error (MONO_GC_PARAMS_NAME, conservative_stack_mark ? "Using `conservative`." : "Using `precise`.",
2892 "Invalid value `%s` for `stack-mark` option, possible values are: `precise`, `conservative`.", opt);
2894 } else if (g_str_has_prefix (opt, "bridge-implementation=")) {
2895 opt = strchr (opt, '=') + 1;
2896 sgen_set_bridge_implementation (opt);
2897 } else if (g_str_has_prefix (opt, "toggleref-test")) {
2898 /* FIXME: This should probably in MONO_GC_DEBUG */
2899 sgen_register_test_toggleref_callback ();
2900 } else if (!sgen_bridge_handle_gc_param (opt)) {
2907 sgen_client_print_gc_params_usage (void)
2909 fprintf (stderr, " stack-mark=MARK-METHOD (where MARK-METHOD is 'precise' or 'conservative')\n");
2913 sgen_client_handle_gc_debug (const char *opt)
2915 if (!strcmp (opt, "xdomain-checks")) {
2916 sgen_mono_xdomain_checks = TRUE;
2917 } else if (!strcmp (opt, "do-not-finalize")) {
2918 mono_do_not_finalize = TRUE;
2919 } else if (g_str_has_prefix (opt, "do-not-finalize=")) {
2920 opt = strchr (opt, '=') + 1;
2921 mono_do_not_finalize = TRUE;
2922 mono_do_not_finalize_class_names = g_strsplit (opt, ",", 0);
2923 } else if (!strcmp (opt, "log-finalizers")) {
2924 log_finalizers = TRUE;
2925 } else if (!strcmp (opt, "no-managed-allocator")) {
2926 sgen_set_use_managed_allocator (FALSE);
2927 } else if (!sgen_bridge_handle_gc_debug (opt)) {
2934 sgen_client_print_gc_debug_usage (void)
2936 fprintf (stderr, " xdomain-checks\n");
2937 fprintf (stderr, " do-not-finalize\n");
2938 fprintf (stderr, " log-finalizers\n");
2939 fprintf (stderr, " no-managed-allocator\n");
2940 sgen_bridge_print_gc_debug_usage ();
2945 sgen_client_get_provenance (void)
2947 #ifdef SGEN_OBJECT_PROVENANCE
2948 MonoGCCallbacks *cb = mono_gc_get_gc_callbacks ();
2949 gpointer (*get_provenance_func) (void);
2952 get_provenance_func = cb->get_provenance_func;
2953 if (get_provenance_func)
2954 return get_provenance_func ();
2962 sgen_client_describe_invalid_pointer (GCObject *ptr)
2964 sgen_bridge_describe_pointer (ptr);
2967 static gboolean gc_inited;
2970 mono_gc_base_init (void)
2975 mono_counters_init ();
2978 mono_w32handle_init ();
2981 #ifdef HEAVY_STATISTICS
2982 mono_counters_register ("los marked cards", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_marked_cards);
2983 mono_counters_register ("los array cards scanned ", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_cards);
2984 mono_counters_register ("los array remsets", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_remsets);
2986 mono_counters_register ("WBarrier set arrayref", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_set_arrayref);
2987 mono_counters_register ("WBarrier value copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_value_copy);
2988 mono_counters_register ("WBarrier object copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_object_copy);
2997 mono_gc_base_cleanup (void)
2999 sgen_thread_pool_shutdown ();
3001 // We should have consumed any outstanding moves.
3002 g_assert (sgen_pointer_queue_is_empty (&moved_objects_queue));
3006 mono_gc_is_null (void)