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 * @domain: the unloading appdomain
561 * @out_array: output array
562 * @out_size: size of output array
564 * Enqueue for finalization all objects that belong to the unloading appdomain @domain
565 * @suspend is used for early termination of the enqueuing process.
568 mono_gc_finalize_domain (MonoDomain *domain)
570 sgen_finalize_if (object_in_domain_predicate, domain);
574 mono_gc_suspend_finalizers (void)
576 sgen_set_suspend_finalizers ();
583 typedef struct _EphemeronLinkNode EphemeronLinkNode;
585 struct _EphemeronLinkNode {
586 EphemeronLinkNode *next;
595 static EphemeronLinkNode *ephemeron_list;
597 /* LOCKING: requires that the GC lock is held */
599 null_ephemerons_for_domain (MonoDomain *domain)
601 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
604 MonoObject *object = (MonoObject*)current->array;
607 SGEN_ASSERT (0, object->vtable, "Can't have objects without vtables.");
609 if (object && object->vtable->domain == domain) {
610 EphemeronLinkNode *tmp = current;
613 prev->next = current->next;
615 ephemeron_list = current->next;
617 current = current->next;
618 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
621 current = current->next;
626 /* LOCKING: requires that the GC lock is held */
628 sgen_client_clear_unreachable_ephemerons (ScanCopyContext ctx)
630 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
631 SgenGrayQueue *queue = ctx.queue;
632 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
633 Ephemeron *cur, *array_end;
637 MonoArray *array = current->array;
639 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
640 EphemeronLinkNode *tmp = current;
642 SGEN_LOG (5, "Dead Ephemeron array at %p", array);
645 prev->next = current->next;
647 ephemeron_list = current->next;
649 current = current->next;
650 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
655 copy_func ((GCObject**)&array, queue);
656 current->array = array;
658 SGEN_LOG (5, "Clearing unreachable entries for ephemeron array at %p", array);
660 cur = mono_array_addr (array, Ephemeron, 0);
661 array_end = cur + mono_array_length_fast (array);
662 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
664 for (; cur < array_end; ++cur) {
665 GCObject *key = cur->key;
667 if (!key || key == tombstone)
670 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
671 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
672 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
674 if (!sgen_is_object_alive_for_current_gen (key)) {
675 cur->key = tombstone;
681 current = current->next;
686 LOCKING: requires that the GC lock is held
688 Limitations: We scan all ephemerons on every collection since the current design doesn't allow for a simple nursery/mature split.
691 sgen_client_mark_ephemerons (ScanCopyContext ctx)
693 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
694 SgenGrayQueue *queue = ctx.queue;
695 gboolean nothing_marked = TRUE;
696 EphemeronLinkNode *current = ephemeron_list;
697 Ephemeron *cur, *array_end;
700 for (current = ephemeron_list; current; current = current->next) {
701 MonoArray *array = current->array;
702 SGEN_LOG (5, "Ephemeron array at %p", array);
704 /*It has to be alive*/
705 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
706 SGEN_LOG (5, "\tnot reachable");
710 copy_func ((GCObject**)&array, queue);
712 cur = mono_array_addr (array, Ephemeron, 0);
713 array_end = cur + mono_array_length_fast (array);
714 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
716 for (; cur < array_end; ++cur) {
717 GCObject *key = cur->key;
719 if (!key || key == tombstone)
722 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
723 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
724 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
726 if (sgen_is_object_alive_for_current_gen (key)) {
727 GCObject *value = cur->value;
729 copy_func (&cur->key, queue);
731 if (!sgen_is_object_alive_for_current_gen (value))
732 nothing_marked = FALSE;
733 copy_func (&cur->value, queue);
739 SGEN_LOG (5, "Ephemeron run finished. Is it done %d", nothing_marked);
740 return nothing_marked;
744 mono_gc_ephemeron_array_add (MonoObject *obj)
746 EphemeronLinkNode *node;
750 node = (EphemeronLinkNode *)sgen_alloc_internal (INTERNAL_MEM_EPHEMERON_LINK);
755 node->array = (MonoArray*)obj;
756 node->next = ephemeron_list;
757 ephemeron_list = node;
759 SGEN_LOG (5, "Registered ephemeron array %p", obj);
770 need_remove_object_for_domain (GCObject *start, MonoDomain *domain)
772 if (mono_object_domain (start) == domain) {
773 SGEN_LOG (4, "Need to cleanup object %p", start);
774 binary_protocol_cleanup (start, (gpointer)SGEN_LOAD_VTABLE (start), sgen_safe_object_get_size ((GCObject*)start));
781 process_object_for_domain_clearing (GCObject *start, MonoDomain *domain)
783 MonoVTable *vt = SGEN_LOAD_VTABLE (start);
784 if (vt->klass == mono_defaults.internal_thread_class)
785 g_assert (mono_object_domain (start) == mono_get_root_domain ());
786 /* The object could be a proxy for an object in the domain
788 #ifndef DISABLE_REMOTING
789 if (mono_defaults.real_proxy_class->supertypes && mono_class_has_parent_fast (vt->klass, mono_defaults.real_proxy_class)) {
790 MonoObject *server = ((MonoRealProxy*)start)->unwrapped_server;
792 /* The server could already have been zeroed out, so
793 we need to check for that, too. */
794 if (server && (!SGEN_LOAD_VTABLE (server) || mono_object_domain (server) == domain)) {
795 SGEN_LOG (4, "Cleaning up remote pointer in %p to object %p", start, server);
796 ((MonoRealProxy*)start)->unwrapped_server = NULL;
803 clear_domain_process_object (GCObject *obj, MonoDomain *domain)
807 process_object_for_domain_clearing (obj, domain);
808 remove = need_remove_object_for_domain (obj, domain);
810 if (remove && obj->synchronisation) {
811 guint32 dislink = mono_monitor_get_object_monitor_gchandle (obj);
813 mono_gchandle_free (dislink);
820 clear_domain_process_minor_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
822 if (clear_domain_process_object (obj, domain)) {
823 CANARIFY_SIZE (size);
824 memset (obj, 0, size);
829 clear_domain_process_major_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
831 clear_domain_process_object (obj, domain);
835 clear_domain_free_major_non_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
837 if (need_remove_object_for_domain (obj, domain))
838 major_collector.free_non_pinned_object (obj, size);
842 clear_domain_free_major_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
844 if (need_remove_object_for_domain (obj, domain))
845 major_collector.free_pinned_object (obj, size);
849 * When appdomains are unloaded we can easily remove objects that have finalizers,
850 * but all the others could still be present in random places on the heap.
851 * We need a sweep to get rid of them even though it's going to be costly
853 * The reason we need to remove them is because we access the vtable and class
854 * structures to know the object size and the reference bitmap: once the domain is
855 * unloaded the point to random memory.
858 mono_gc_clear_domain (MonoDomain * domain)
860 LOSObject *bigobj, *prev;
865 binary_protocol_domain_unload_begin (domain);
869 if (sgen_concurrent_collection_in_progress ())
870 sgen_perform_collection (0, GENERATION_OLD, "clear domain", TRUE, FALSE);
871 SGEN_ASSERT (0, !sgen_concurrent_collection_in_progress (), "We just ordered a synchronous collection. Why are we collecting concurrently?");
873 major_collector.finish_sweeping ();
875 sgen_process_fin_stage_entries ();
877 sgen_clear_nursery_fragments ();
879 if (sgen_mono_xdomain_checks && domain != mono_get_root_domain ()) {
880 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_NORMAL);
881 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_WBARRIER);
882 sgen_check_for_xdomain_refs ();
885 /*Ephemerons and dislinks must be processed before LOS since they might end up pointing
886 to memory returned to the OS.*/
887 null_ephemerons_for_domain (domain);
888 sgen_null_links_for_domain (domain);
890 for (i = GENERATION_NURSERY; i < GENERATION_MAX; ++i)
891 sgen_remove_finalizers_if (object_in_domain_predicate, domain, i);
893 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
894 (IterateObjectCallbackFunc)clear_domain_process_minor_object_callback, domain, FALSE, TRUE);
896 /* We need two passes over major and large objects because
897 freeing such objects might give their memory back to the OS
898 (in the case of large objects) or obliterate its vtable
899 (pinned objects with major-copying or pinned and non-pinned
900 objects with major-mark&sweep), but we might need to
901 dereference a pointer from an object to another object if
902 the first object is a proxy. */
903 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, (IterateObjectCallbackFunc)clear_domain_process_major_object_callback, domain);
904 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
905 clear_domain_process_object ((GCObject*)bigobj->data, domain);
908 for (bigobj = los_object_list; bigobj;) {
909 if (need_remove_object_for_domain ((GCObject*)bigobj->data, domain)) {
910 LOSObject *to_free = bigobj;
912 prev->next = bigobj->next;
914 los_object_list = bigobj->next;
915 bigobj = bigobj->next;
916 SGEN_LOG (4, "Freeing large object %p", bigobj->data);
917 sgen_los_free_object (to_free);
921 bigobj = bigobj->next;
923 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_NON_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_non_pinned_object_callback, domain);
924 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_pinned_object_callback, domain);
926 if (domain == mono_get_root_domain ()) {
927 sgen_pin_stats_report ();
928 sgen_object_layout_dump (stdout);
931 sgen_restart_world (0);
933 binary_protocol_domain_unload_end (domain);
934 binary_protocol_flush_buffers (FALSE);
944 mono_gc_alloc_obj (MonoVTable *vtable, size_t size)
946 MonoObject *obj = sgen_alloc_obj (vtable, size);
948 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
950 mono_profiler_allocation (obj);
957 mono_gc_alloc_pinned_obj (MonoVTable *vtable, size_t size)
959 MonoObject *obj = sgen_alloc_obj_pinned (vtable, size);
961 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
963 mono_profiler_allocation (obj);
970 mono_gc_alloc_mature (MonoVTable *vtable, size_t size)
972 MonoObject *obj = sgen_alloc_obj_mature (vtable, size);
974 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
976 mono_profiler_allocation (obj);
983 mono_gc_alloc_fixed (size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
985 /* FIXME: do a single allocation */
986 void *res = g_calloc (1, size);
989 if (!mono_gc_register_root ((char *)res, size, descr, source, msg)) {
997 mono_gc_free_fixed (void* addr)
999 mono_gc_deregister_root ((char *)addr);
1007 static MonoMethod* alloc_method_cache [ATYPE_NUM];
1008 static MonoMethod* slowpath_alloc_method_cache [ATYPE_NUM];
1009 static gboolean use_managed_allocator = TRUE;
1011 #ifdef MANAGED_ALLOCATION
1012 // Cache the SgenThreadInfo pointer in a local 'var'.
1013 #define EMIT_TLS_ACCESS_VAR(mb, var) \
1015 var = mono_mb_add_local ((mb), &mono_defaults.int_class->byval_arg); \
1016 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1017 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1018 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1019 mono_mb_emit_stloc ((mb), (var)); \
1022 #define EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR(mb, var) \
1024 mono_mb_emit_ldloc ((mb), (var)); \
1025 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenClientThreadInfo, in_critical_region)); \
1026 mono_mb_emit_byte ((mb), CEE_ADD); \
1029 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb, var) do { \
1030 mono_mb_emit_ldloc ((mb), (var)); \
1031 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_next)); \
1032 mono_mb_emit_byte ((mb), CEE_ADD); \
1035 #define EMIT_TLS_ACCESS_TEMP_END(mb, var) do { \
1036 mono_mb_emit_ldloc ((mb), (var)); \
1037 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_temp_end)); \
1038 mono_mb_emit_byte ((mb), CEE_ADD); \
1039 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1042 /* FIXME: Do this in the JIT, where specialized allocation sequences can be created
1043 * for each class. This is currently not easy to do, as it is hard to generate basic
1044 * blocks + branches, but it is easy with the linear IL codebase.
1046 * For this to work we'd need to solve the TLAB race, first. Now we
1047 * require the allocator to be in a few known methods to make sure
1048 * that they are executed atomically via the restart mechanism.
1051 create_allocator (int atype, ManagedAllocatorVariant variant)
1053 int p_var, size_var, real_size_var, thread_var G_GNUC_UNUSED;
1054 gboolean slowpath = variant == MANAGED_ALLOCATOR_SLOW_PATH;
1055 guint32 fastpath_branch, max_size_branch, no_oom_branch;
1056 MonoMethodBuilder *mb;
1058 MonoMethodSignature *csig;
1059 static gboolean registered = FALSE;
1060 int tlab_next_addr_var, new_next_var;
1061 const char *name = NULL;
1066 mono_register_jit_icall (mono_gc_alloc_obj, "mono_gc_alloc_obj", mono_create_icall_signature ("object ptr int"), FALSE);
1067 mono_register_jit_icall (mono_gc_alloc_vector, "mono_gc_alloc_vector", mono_create_icall_signature ("object ptr int int"), FALSE);
1068 mono_register_jit_icall (mono_gc_alloc_string, "mono_gc_alloc_string", mono_create_icall_signature ("object ptr int int32"), FALSE);
1072 if (atype == ATYPE_SMALL) {
1073 name = slowpath ? "SlowAllocSmall" : "AllocSmall";
1074 } else if (atype == ATYPE_NORMAL) {
1075 name = slowpath ? "SlowAlloc" : "Alloc";
1076 } else if (atype == ATYPE_VECTOR) {
1077 name = slowpath ? "SlowAllocVector" : "AllocVector";
1078 } else if (atype == ATYPE_STRING) {
1079 name = slowpath ? "SlowAllocString" : "AllocString";
1081 g_assert_not_reached ();
1084 if (atype == ATYPE_NORMAL)
1089 csig = mono_metadata_signature_alloc (mono_defaults.corlib, num_params);
1090 if (atype == ATYPE_STRING) {
1091 csig->ret = &mono_defaults.string_class->byval_arg;
1092 csig->params [0] = &mono_defaults.int_class->byval_arg;
1093 csig->params [1] = &mono_defaults.int32_class->byval_arg;
1095 csig->ret = &mono_defaults.object_class->byval_arg;
1096 for (i = 0; i < num_params; i++)
1097 csig->params [i] = &mono_defaults.int_class->byval_arg;
1100 mb = mono_mb_new (mono_defaults.object_class, name, MONO_WRAPPER_ALLOC);
1107 mono_mb_emit_ldarg (mb, 0);
1108 mono_mb_emit_icall (mb, ves_icall_object_new_specific);
1111 mono_mb_emit_ldarg (mb, 0);
1112 mono_mb_emit_ldarg (mb, 1);
1113 mono_mb_emit_icall (mb, ves_icall_array_new_specific);
1116 mono_mb_emit_ldarg (mb, 1);
1117 mono_mb_emit_icall (mb, ves_icall_string_alloc);
1120 g_assert_not_reached ();
1127 * Tls access might call foreign code or code without jinfo. This can
1128 * only happen if we are outside of the critical region.
1130 EMIT_TLS_ACCESS_VAR (mb, thread_var);
1132 size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1133 if (atype == ATYPE_SMALL) {
1134 /* size_var = size_arg */
1135 mono_mb_emit_ldarg (mb, 1);
1136 mono_mb_emit_stloc (mb, size_var);
1137 } else if (atype == ATYPE_NORMAL) {
1138 /* size = vtable->klass->instance_size; */
1139 mono_mb_emit_ldarg (mb, 0);
1140 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1141 mono_mb_emit_byte (mb, CEE_ADD);
1142 mono_mb_emit_byte (mb, CEE_LDIND_I);
1143 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, instance_size));
1144 mono_mb_emit_byte (mb, CEE_ADD);
1145 /* FIXME: assert instance_size stays a 4 byte integer */
1146 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1147 mono_mb_emit_byte (mb, CEE_CONV_I);
1148 mono_mb_emit_stloc (mb, size_var);
1149 } else if (atype == ATYPE_VECTOR) {
1150 MonoExceptionClause *clause;
1151 int pos, pos_leave, pos_error;
1152 MonoClass *oom_exc_class;
1156 * n > MONO_ARRAY_MAX_INDEX => OutOfMemoryException
1157 * n < 0 => OverflowException
1159 * We can do an unsigned comparison to catch both cases, then in the error
1160 * case compare signed to distinguish between them.
1162 mono_mb_emit_ldarg (mb, 1);
1163 mono_mb_emit_icon (mb, MONO_ARRAY_MAX_INDEX);
1164 mono_mb_emit_byte (mb, CEE_CONV_U);
1165 pos = mono_mb_emit_short_branch (mb, CEE_BLE_UN_S);
1167 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1168 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1169 mono_mb_emit_ldarg (mb, 1);
1170 mono_mb_emit_icon (mb, 0);
1171 pos_error = mono_mb_emit_short_branch (mb, CEE_BLT_S);
1172 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1173 mono_mb_patch_short_branch (mb, pos_error);
1174 mono_mb_emit_exception (mb, "OverflowException", NULL);
1176 mono_mb_patch_short_branch (mb, pos);
1178 clause = (MonoExceptionClause *)mono_image_alloc0 (mono_defaults.corlib, sizeof (MonoExceptionClause));
1179 clause->try_offset = mono_mb_get_label (mb);
1181 /* vtable->klass->sizes.element_size */
1182 mono_mb_emit_ldarg (mb, 0);
1183 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1184 mono_mb_emit_byte (mb, CEE_ADD);
1185 mono_mb_emit_byte (mb, CEE_LDIND_I);
1186 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, sizes));
1187 mono_mb_emit_byte (mb, CEE_ADD);
1188 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1189 mono_mb_emit_byte (mb, CEE_CONV_I);
1192 mono_mb_emit_ldarg (mb, 1);
1193 mono_mb_emit_byte (mb, CEE_MUL_OVF_UN);
1194 /* + sizeof (MonoArray) */
1195 mono_mb_emit_icon (mb, MONO_SIZEOF_MONO_ARRAY);
1196 mono_mb_emit_byte (mb, CEE_ADD_OVF_UN);
1197 mono_mb_emit_stloc (mb, size_var);
1199 pos_leave = mono_mb_emit_branch (mb, CEE_LEAVE);
1202 clause->flags = MONO_EXCEPTION_CLAUSE_NONE;
1203 clause->try_len = mono_mb_get_pos (mb) - clause->try_offset;
1204 clause->data.catch_class = mono_class_load_from_name (mono_defaults.corlib,
1205 "System", "OverflowException");
1206 clause->handler_offset = mono_mb_get_label (mb);
1208 oom_exc_class = mono_class_load_from_name (mono_defaults.corlib,
1209 "System", "OutOfMemoryException");
1210 ctor = mono_class_get_method_from_name (oom_exc_class, ".ctor", 0);
1213 mono_mb_emit_byte (mb, CEE_POP);
1214 mono_mb_emit_op (mb, CEE_NEWOBJ, ctor);
1215 mono_mb_emit_byte (mb, CEE_THROW);
1217 clause->handler_len = mono_mb_get_pos (mb) - clause->handler_offset;
1218 mono_mb_set_clauses (mb, 1, clause);
1219 mono_mb_patch_branch (mb, pos_leave);
1221 } else if (atype == ATYPE_STRING) {
1225 * a string allocator method takes the args: (vtable, len)
1227 * bytes = offsetof (MonoString, chars) + ((len + 1) * 2)
1231 * bytes <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1235 * offsetof (MonoString, chars) + ((len + 1) * 2) <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1236 * len <= (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - offsetof (MonoString, chars)) / 2 - 1
1238 mono_mb_emit_ldarg (mb, 1);
1239 mono_mb_emit_icon (mb, (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - MONO_STRUCT_OFFSET (MonoString, chars)) / 2 - 1);
1240 pos = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
1242 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1243 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1244 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1245 mono_mb_patch_short_branch (mb, pos);
1247 mono_mb_emit_ldarg (mb, 1);
1248 mono_mb_emit_icon (mb, 1);
1249 mono_mb_emit_byte (mb, MONO_CEE_SHL);
1250 //WE manually fold the above + 2 here
1251 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, chars) + 2);
1252 mono_mb_emit_byte (mb, CEE_ADD);
1253 mono_mb_emit_stloc (mb, size_var);
1255 g_assert_not_reached ();
1258 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1259 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1260 mono_mb_emit_byte (mb, CEE_LDC_I4_1);
1261 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1262 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1263 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_NONE);
1266 if (nursery_canaries_enabled ()) {
1267 real_size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1268 mono_mb_emit_ldloc (mb, size_var);
1269 mono_mb_emit_stloc(mb, real_size_var);
1272 real_size_var = size_var;
1274 /* size += ALLOC_ALIGN - 1; */
1275 mono_mb_emit_ldloc (mb, size_var);
1276 mono_mb_emit_icon (mb, SGEN_ALLOC_ALIGN - 1);
1277 mono_mb_emit_byte (mb, CEE_ADD);
1278 /* size &= ~(ALLOC_ALIGN - 1); */
1279 mono_mb_emit_icon (mb, ~(SGEN_ALLOC_ALIGN - 1));
1280 mono_mb_emit_byte (mb, CEE_AND);
1281 mono_mb_emit_stloc (mb, size_var);
1283 /* if (size > MAX_SMALL_OBJ_SIZE) goto slowpath */
1284 if (atype != ATYPE_SMALL) {
1285 mono_mb_emit_ldloc (mb, size_var);
1286 mono_mb_emit_icon (mb, SGEN_MAX_SMALL_OBJ_SIZE);
1287 max_size_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
1291 * We need to modify tlab_next, but the JIT only supports reading, so we read
1292 * another tls var holding its address instead.
1295 /* tlab_next_addr (local) = tlab_next_addr (TLS var) */
1296 tlab_next_addr_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1297 EMIT_TLS_ACCESS_NEXT_ADDR (mb, thread_var);
1298 mono_mb_emit_stloc (mb, tlab_next_addr_var);
1300 /* p = (void**)tlab_next; */
1301 p_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1302 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1303 mono_mb_emit_byte (mb, CEE_LDIND_I);
1304 mono_mb_emit_stloc (mb, p_var);
1306 /* new_next = (char*)p + size; */
1307 new_next_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1308 mono_mb_emit_ldloc (mb, p_var);
1309 mono_mb_emit_ldloc (mb, size_var);
1310 mono_mb_emit_byte (mb, CEE_CONV_I);
1311 mono_mb_emit_byte (mb, CEE_ADD);
1313 if (nursery_canaries_enabled ()) {
1314 mono_mb_emit_icon (mb, CANARY_SIZE);
1315 mono_mb_emit_byte (mb, CEE_ADD);
1317 mono_mb_emit_stloc (mb, new_next_var);
1319 /* if (G_LIKELY (new_next < tlab_temp_end)) */
1320 mono_mb_emit_ldloc (mb, new_next_var);
1321 EMIT_TLS_ACCESS_TEMP_END (mb, thread_var);
1322 fastpath_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
1325 if (atype != ATYPE_SMALL)
1326 mono_mb_patch_short_branch (mb, max_size_branch);
1328 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1329 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1331 * We are no longer in a critical section. We need to do this before calling
1332 * to unmanaged land in order to avoid stw deadlocks since unmanaged code
1335 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1336 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1337 mono_mb_emit_byte (mb, CEE_LDC_I4_0);
1338 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1339 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1340 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_NONE);
1343 /* FIXME: mono_gc_alloc_obj takes a 'size_t' as an argument, not an int32 */
1344 mono_mb_emit_ldarg (mb, 0);
1345 mono_mb_emit_ldloc (mb, real_size_var);
1346 if (atype == ATYPE_NORMAL || atype == ATYPE_SMALL) {
1347 mono_mb_emit_icall (mb, mono_gc_alloc_obj);
1348 } else if (atype == ATYPE_VECTOR) {
1349 mono_mb_emit_ldarg (mb, 1);
1350 mono_mb_emit_icall (mb, mono_gc_alloc_vector);
1351 } else if (atype == ATYPE_STRING) {
1352 mono_mb_emit_ldarg (mb, 1);
1353 mono_mb_emit_icall (mb, mono_gc_alloc_string);
1355 g_assert_not_reached ();
1358 /* if (ret == NULL) throw OOM; */
1359 mono_mb_emit_byte (mb, CEE_DUP);
1360 no_oom_branch = mono_mb_emit_branch (mb, CEE_BRTRUE);
1361 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1363 mono_mb_patch_branch (mb, no_oom_branch);
1364 mono_mb_emit_byte (mb, CEE_RET);
1367 mono_mb_patch_short_branch (mb, fastpath_branch);
1369 /* FIXME: Memory barrier */
1371 /* tlab_next = new_next */
1372 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1373 mono_mb_emit_ldloc (mb, new_next_var);
1374 mono_mb_emit_byte (mb, CEE_STIND_I);
1377 mono_mb_emit_ldloc (mb, p_var);
1378 mono_mb_emit_ldarg (mb, 0);
1379 mono_mb_emit_byte (mb, CEE_STIND_I);
1381 /* mark object end with nursery word */
1382 if (nursery_canaries_enabled ()) {
1383 mono_mb_emit_ldloc (mb, p_var);
1384 mono_mb_emit_ldloc (mb, real_size_var);
1385 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1386 mono_mb_emit_icon8 (mb, (mword) CANARY_STRING);
1387 mono_mb_emit_icon (mb, CANARY_SIZE);
1388 mono_mb_emit_byte (mb, MONO_CEE_PREFIX1);
1389 mono_mb_emit_byte (mb, CEE_CPBLK);
1392 if (atype == ATYPE_VECTOR) {
1393 /* arr->max_length = max_length; */
1394 mono_mb_emit_ldloc (mb, p_var);
1395 mono_mb_emit_ldflda (mb, MONO_STRUCT_OFFSET (MonoArray, max_length));
1396 mono_mb_emit_ldarg (mb, 1);
1397 #ifdef MONO_BIG_ARRAYS
1398 mono_mb_emit_byte (mb, CEE_STIND_I);
1400 mono_mb_emit_byte (mb, CEE_STIND_I4);
1402 } else if (atype == ATYPE_STRING) {
1403 /* need to set length and clear the last char */
1404 /* s->length = len; */
1405 mono_mb_emit_ldloc (mb, p_var);
1406 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, length));
1407 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1408 mono_mb_emit_ldarg (mb, 1);
1409 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
1412 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1413 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1414 mono_mb_emit_byte (mb, CEE_LDC_I4_0);
1415 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1416 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1418 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1419 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1422 We must make sure both vtable and max_length are globaly visible before returning to managed land.
1424 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1427 mono_mb_emit_ldloc (mb, p_var);
1430 mono_mb_emit_byte (mb, CEE_RET);
1433 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
1434 info->d.alloc.gc_name = "sgen";
1435 info->d.alloc.alloc_type = atype;
1438 mb->init_locals = FALSE;
1441 res = mono_mb_create (mb, csig, 8, info);
1450 mono_gc_get_aligned_size_for_allocator (int size)
1452 return SGEN_ALIGN_UP (size);
1456 * Generate an allocator method implementing the fast path of mono_gc_alloc_obj ().
1457 * The signature of the called method is:
1458 * object allocate (MonoVTable *vtable)
1461 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box, gboolean known_instance_size)
1463 #ifdef MANAGED_ALLOCATION
1464 if (collect_before_allocs)
1466 if (klass->instance_size > tlab_size)
1468 if (known_instance_size && ALIGN_TO (klass->instance_size, SGEN_ALLOC_ALIGN) >= SGEN_MAX_SMALL_OBJ_SIZE)
1470 if (mono_class_has_finalizer (klass) || mono_class_is_marshalbyref (klass))
1474 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1476 if (klass->byval_arg.type == MONO_TYPE_STRING)
1477 return mono_gc_get_managed_allocator_by_type (ATYPE_STRING, MANAGED_ALLOCATOR_REGULAR);
1478 /* Generic classes have dynamic field and can go above MAX_SMALL_OBJ_SIZE. */
1479 if (known_instance_size)
1480 return mono_gc_get_managed_allocator_by_type (ATYPE_SMALL, MANAGED_ALLOCATOR_REGULAR);
1482 return mono_gc_get_managed_allocator_by_type (ATYPE_NORMAL, MANAGED_ALLOCATOR_REGULAR);
1489 mono_gc_get_managed_array_allocator (MonoClass *klass)
1491 #ifdef MANAGED_ALLOCATION
1492 if (klass->rank != 1)
1494 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1496 if (has_per_allocation_action)
1498 g_assert (!mono_class_has_finalizer (klass) && !mono_class_is_marshalbyref (klass));
1500 return mono_gc_get_managed_allocator_by_type (ATYPE_VECTOR, MANAGED_ALLOCATOR_REGULAR);
1507 sgen_set_use_managed_allocator (gboolean flag)
1509 use_managed_allocator = flag;
1513 mono_gc_get_managed_allocator_by_type (int atype, ManagedAllocatorVariant variant)
1515 #ifdef MANAGED_ALLOCATION
1519 if (variant == MANAGED_ALLOCATOR_REGULAR && !use_managed_allocator)
1523 case MANAGED_ALLOCATOR_REGULAR: cache = alloc_method_cache; break;
1524 case MANAGED_ALLOCATOR_SLOW_PATH: cache = slowpath_alloc_method_cache; break;
1525 default: g_assert_not_reached (); break;
1528 res = cache [atype];
1532 res = create_allocator (atype, variant);
1534 if (cache [atype]) {
1535 mono_free_method (res);
1536 res = cache [atype];
1538 mono_memory_barrier ();
1539 cache [atype] = res;
1550 mono_gc_get_managed_allocator_types (void)
1556 sgen_is_managed_allocator (MonoMethod *method)
1560 for (i = 0; i < ATYPE_NUM; ++i)
1561 if (method == alloc_method_cache [i] || method == slowpath_alloc_method_cache [i])
1567 sgen_has_managed_allocator (void)
1571 for (i = 0; i < ATYPE_NUM; ++i)
1572 if (alloc_method_cache [i] || slowpath_alloc_method_cache [i])
1577 #define ARRAY_OBJ_INDEX(ptr,array,elem_size) (((char*)(ptr) - ((char*)(array) + G_STRUCT_OFFSET (MonoArray, vector))) / (elem_size))
1580 sgen_client_cardtable_scan_object (GCObject *obj, guint8 *cards, ScanCopyContext ctx)
1582 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
1583 MonoClass *klass = vt->klass;
1585 SGEN_ASSERT (0, SGEN_VTABLE_HAS_REFERENCES (vt), "Why would we ever call this on reference-free objects?");
1588 MonoArray *arr = (MonoArray*)obj;
1589 guint8 *card_data, *card_base;
1590 guint8 *card_data_end;
1591 char *obj_start = (char *)sgen_card_table_align_pointer (obj);
1593 mword obj_size = sgen_mono_array_size (vt, arr, &bounds_size, sgen_vtable_get_descriptor (vt));
1594 /* We don't want to scan the bounds entries at the end of multidimensional arrays */
1595 char *obj_end = (char*)obj + obj_size - bounds_size;
1597 size_t extra_idx = 0;
1599 mword desc = (mword)klass->element_class->gc_descr;
1600 int elem_size = mono_array_element_size (klass);
1602 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1603 guint8 *overflow_scan_end = NULL;
1606 #ifdef SGEN_OBJECT_LAYOUT_STATISTICS
1607 if (klass->element_class->valuetype)
1608 sgen_object_layout_scanned_vtype_array ();
1610 sgen_object_layout_scanned_ref_array ();
1616 card_data = sgen_card_table_get_card_scan_address ((mword)obj);
1618 card_base = card_data;
1619 card_count = sgen_card_table_number_of_cards_in_range ((mword)obj, obj_size);
1620 card_data_end = card_data + card_count;
1623 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1624 /*Check for overflow and if so, setup to scan in two steps*/
1625 if (!cards && card_data_end >= SGEN_SHADOW_CARDTABLE_END) {
1626 overflow_scan_end = sgen_shadow_cardtable + (card_data_end - SGEN_SHADOW_CARDTABLE_END);
1627 card_data_end = SGEN_SHADOW_CARDTABLE_END;
1633 card_data = sgen_find_next_card (card_data, card_data_end);
1634 for (; card_data < card_data_end; card_data = sgen_find_next_card (card_data + 1, card_data_end)) {
1636 size_t idx = (card_data - card_base) + extra_idx;
1637 char *start = (char*)(obj_start + idx * CARD_SIZE_IN_BYTES);
1638 char *card_end = start + CARD_SIZE_IN_BYTES;
1639 char *first_elem, *elem;
1641 HEAVY_STAT (++los_marked_cards);
1644 sgen_card_table_prepare_card_for_scanning (card_data);
1646 card_end = MIN (card_end, obj_end);
1648 if (start <= (char*)arr->vector)
1651 index = ARRAY_OBJ_INDEX (start, obj, elem_size);
1653 elem = first_elem = (char*)mono_array_addr_with_size_fast ((MonoArray*)obj, elem_size, index);
1654 if (klass->element_class->valuetype) {
1655 ScanVTypeFunc scan_vtype_func = ctx.ops->scan_vtype;
1657 for (; elem < card_end; elem += elem_size)
1658 scan_vtype_func (obj, elem, desc, ctx.queue BINARY_PROTOCOL_ARG (elem_size));
1660 ScanPtrFieldFunc scan_ptr_field_func = ctx.ops->scan_ptr_field;
1662 HEAVY_STAT (++los_array_cards);
1663 for (; elem < card_end; elem += SIZEOF_VOID_P)
1664 scan_ptr_field_func (obj, (GCObject**)elem, ctx.queue);
1667 binary_protocol_card_scan (first_elem, elem - first_elem);
1670 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1671 if (overflow_scan_end) {
1672 extra_idx = card_data - card_base;
1673 card_base = card_data = sgen_shadow_cardtable;
1674 card_data_end = overflow_scan_end;
1675 overflow_scan_end = NULL;
1686 * Array and string allocation
1690 mono_gc_alloc_vector (MonoVTable *vtable, size_t size, uintptr_t max_length)
1695 if (!SGEN_CAN_ALIGN_UP (size))
1698 #ifndef DISABLE_CRITICAL_REGION
1699 ENTER_CRITICAL_REGION;
1700 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1702 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1703 arr->max_length = (mono_array_size_t)max_length;
1704 EXIT_CRITICAL_REGION;
1707 EXIT_CRITICAL_REGION;
1712 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1713 if (G_UNLIKELY (!arr)) {
1718 arr->max_length = (mono_array_size_t)max_length;
1723 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1724 mono_profiler_allocation (&arr->obj);
1726 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Vector has incorrect size.");
1731 mono_gc_alloc_array (MonoVTable *vtable, size_t size, uintptr_t max_length, uintptr_t bounds_size)
1734 MonoArrayBounds *bounds;
1737 if (!SGEN_CAN_ALIGN_UP (size))
1740 #ifndef DISABLE_CRITICAL_REGION
1741 ENTER_CRITICAL_REGION;
1742 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1744 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1745 arr->max_length = (mono_array_size_t)max_length;
1747 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1748 arr->bounds = bounds;
1749 EXIT_CRITICAL_REGION;
1752 EXIT_CRITICAL_REGION;
1757 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1758 if (G_UNLIKELY (!arr)) {
1763 arr->max_length = (mono_array_size_t)max_length;
1765 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1766 arr->bounds = bounds;
1771 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1772 mono_profiler_allocation (&arr->obj);
1774 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Array has incorrect size.");
1779 mono_gc_alloc_string (MonoVTable *vtable, size_t size, gint32 len)
1784 if (!SGEN_CAN_ALIGN_UP (size))
1787 #ifndef DISABLE_CRITICAL_REGION
1788 ENTER_CRITICAL_REGION;
1789 str = (MonoString*)sgen_try_alloc_obj_nolock (vtable, size);
1791 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1793 EXIT_CRITICAL_REGION;
1796 EXIT_CRITICAL_REGION;
1801 str = (MonoString*)sgen_alloc_obj_nolock (vtable, size);
1802 if (G_UNLIKELY (!str)) {
1812 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1813 mono_profiler_allocation (&str->object);
1823 mono_gc_set_string_length (MonoString *str, gint32 new_length)
1825 mono_unichar2 *new_end = str->chars + new_length;
1827 /* zero the discarded string. This null-delimits the string and allows
1828 * the space to be reclaimed by SGen. */
1830 if (nursery_canaries_enabled () && sgen_ptr_in_nursery (str)) {
1831 CHECK_CANARY_FOR_OBJECT ((GCObject*)str, TRUE);
1832 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2) + CANARY_SIZE);
1833 memcpy (new_end + 1 , CANARY_STRING, CANARY_SIZE);
1835 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2));
1838 str->length = new_length;
1845 #define GC_ROOT_NUM 32
1847 int count; /* must be the first field */
1848 void *objects [GC_ROOT_NUM];
1849 int root_types [GC_ROOT_NUM];
1850 uintptr_t extra_info [GC_ROOT_NUM];
1854 notify_gc_roots (GCRootReport *report)
1858 mono_profiler_gc_roots (report->count, report->objects, report->root_types, report->extra_info);
1863 add_profile_gc_root (GCRootReport *report, void *object, int rtype, uintptr_t extra_info)
1865 if (report->count == GC_ROOT_NUM)
1866 notify_gc_roots (report);
1867 report->objects [report->count] = object;
1868 report->root_types [report->count] = rtype;
1869 report->extra_info [report->count++] = (uintptr_t)SGEN_LOAD_VTABLE (object)->klass;
1873 sgen_client_nursery_objects_pinned (void **definitely_pinned, int count)
1875 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS) {
1876 GCRootReport report;
1879 for (idx = 0; idx < count; ++idx)
1880 add_profile_gc_root (&report, definitely_pinned [idx], MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
1881 notify_gc_roots (&report);
1886 report_finalizer_roots_from_queue (SgenPointerQueue *queue)
1888 GCRootReport report;
1892 for (i = 0; i < queue->next_slot; ++i) {
1893 void *obj = queue->data [i];
1896 add_profile_gc_root (&report, obj, MONO_PROFILE_GC_ROOT_FINALIZER, 0);
1898 notify_gc_roots (&report);
1902 report_finalizer_roots (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
1904 report_finalizer_roots_from_queue (fin_ready_queue);
1905 report_finalizer_roots_from_queue (critical_fin_queue);
1908 static GCRootReport *root_report;
1911 single_arg_report_root (MonoObject **obj, void *gc_data)
1914 add_profile_gc_root (root_report, *obj, MONO_PROFILE_GC_ROOT_OTHER, 0);
1918 precisely_report_roots_from (GCRootReport *report, void** start_root, void** end_root, mword desc)
1920 switch (desc & ROOT_DESC_TYPE_MASK) {
1921 case ROOT_DESC_BITMAP:
1922 desc >>= ROOT_DESC_TYPE_SHIFT;
1924 if ((desc & 1) && *start_root) {
1925 add_profile_gc_root (report, *start_root, MONO_PROFILE_GC_ROOT_OTHER, 0);
1931 case ROOT_DESC_COMPLEX: {
1932 gsize *bitmap_data = (gsize *)sgen_get_complex_descriptor_bitmap (desc);
1933 gsize bwords = (*bitmap_data) - 1;
1934 void **start_run = start_root;
1936 while (bwords-- > 0) {
1937 gsize bmap = *bitmap_data++;
1938 void **objptr = start_run;
1940 if ((bmap & 1) && *objptr) {
1941 add_profile_gc_root (report, *objptr, MONO_PROFILE_GC_ROOT_OTHER, 0);
1946 start_run += GC_BITS_PER_WORD;
1950 case ROOT_DESC_VECTOR: {
1953 for (p = start_root; p < end_root; p++) {
1955 add_profile_gc_root (report, *p, MONO_PROFILE_GC_ROOT_OTHER, 0);
1959 case ROOT_DESC_USER: {
1960 MonoGCRootMarkFunc marker = (MonoGCRootMarkFunc)sgen_get_user_descriptor_func (desc);
1961 root_report = report;
1962 marker ((MonoObject**)start_root, single_arg_report_root, NULL);
1965 case ROOT_DESC_RUN_LEN:
1966 g_assert_not_reached ();
1968 g_assert_not_reached ();
1973 report_registered_roots_by_type (int root_type)
1975 GCRootReport report;
1979 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], void **, start_root, RootRecord *, root) {
1980 SGEN_LOG (6, "Precise root scan %p-%p (desc: %p)", start_root, root->end_root, (void*)root->root_desc);
1981 precisely_report_roots_from (&report, start_root, (void**)root->end_root, root->root_desc);
1982 } SGEN_HASH_TABLE_FOREACH_END;
1983 notify_gc_roots (&report);
1987 report_registered_roots (void)
1989 report_registered_roots_by_type (ROOT_TYPE_NORMAL);
1990 report_registered_roots_by_type (ROOT_TYPE_WBARRIER);
1994 sgen_client_collecting_minor (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
1996 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
1997 report_registered_roots ();
1998 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
1999 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2002 static GCRootReport major_root_report;
2003 static gboolean profile_roots;
2006 sgen_client_collecting_major_1 (void)
2008 profile_roots = mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS;
2009 memset (&major_root_report, 0, sizeof (GCRootReport));
2013 sgen_client_pinned_los_object (GCObject *obj)
2016 add_profile_gc_root (&major_root_report, (char*)obj, MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
2020 sgen_client_collecting_major_2 (void)
2023 notify_gc_roots (&major_root_report);
2025 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2026 report_registered_roots ();
2030 sgen_client_collecting_major_3 (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2032 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2033 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2036 #define MOVED_OBJECTS_NUM 64
2037 static void *moved_objects [MOVED_OBJECTS_NUM];
2038 static int moved_objects_idx = 0;
2040 static SgenPointerQueue moved_objects_queue = SGEN_POINTER_QUEUE_INIT (INTERNAL_MEM_MOVED_OBJECT);
2043 mono_sgen_register_moved_object (void *obj, void *destination)
2046 * This function can be called from SGen's worker threads. We want to try
2047 * and avoid exposing those threads to the profiler API, so queue up move
2048 * events and send them later when the main GC thread calls
2049 * mono_sgen_gc_event_moves ().
2051 * TODO: Once SGen has multiple worker threads, we need to switch to a
2052 * lock-free data structure for the queue as multiple threads will be
2053 * adding to it at the same time.
2055 if (sgen_thread_pool_is_thread_pool_thread (mono_native_thread_id_get ())) {
2056 sgen_pointer_queue_add (&moved_objects_queue, obj);
2057 sgen_pointer_queue_add (&moved_objects_queue, destination);
2059 if (moved_objects_idx == MOVED_OBJECTS_NUM) {
2060 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2061 moved_objects_idx = 0;
2064 moved_objects [moved_objects_idx++] = obj;
2065 moved_objects [moved_objects_idx++] = destination;
2070 mono_sgen_gc_event_moves (void)
2072 while (!sgen_pointer_queue_is_empty (&moved_objects_queue)) {
2073 void *dst = sgen_pointer_queue_pop (&moved_objects_queue);
2074 void *src = sgen_pointer_queue_pop (&moved_objects_queue);
2076 mono_sgen_register_moved_object (src, dst);
2079 if (moved_objects_idx) {
2080 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2081 moved_objects_idx = 0;
2089 #define REFS_SIZE 128
2092 MonoGCReferences callback;
2096 MonoObject *refs [REFS_SIZE];
2097 uintptr_t offsets [REFS_SIZE];
2101 #define HANDLE_PTR(ptr,obj) do { \
2103 if (hwi->count == REFS_SIZE) { \
2104 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data); \
2108 hwi->offsets [hwi->count] = (char*)(ptr)-(char*)start; \
2109 hwi->refs [hwi->count++] = *(ptr); \
2114 collect_references (HeapWalkInfo *hwi, GCObject *obj, size_t size)
2116 char *start = (char*)obj;
2117 mword desc = sgen_obj_get_descriptor (obj);
2119 #include "sgen/sgen-scan-object.h"
2123 walk_references (GCObject *start, size_t size, void *data)
2125 HeapWalkInfo *hwi = (HeapWalkInfo *)data;
2128 collect_references (hwi, start, size);
2129 if (hwi->count || !hwi->called)
2130 hwi->callback (start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data);
2134 * mono_gc_walk_heap:
2135 * @flags: flags for future use
2136 * @callback: a function pointer called for each object in the heap
2137 * @data: a user data pointer that is passed to callback
2139 * This function can be used to iterate over all the live objects in the heap:
2140 * for each object, @callback is invoked, providing info about the object's
2141 * location in memory, its class, its size and the objects it references.
2142 * For each referenced object it's offset from the object address is
2143 * reported in the offsets array.
2144 * The object references may be buffered, so the callback may be invoked
2145 * multiple times for the same object: in all but the first call, the size
2146 * argument will be zero.
2147 * Note that this function can be only called in the #MONO_GC_EVENT_PRE_START_WORLD
2148 * profiler event handler.
2150 * Returns: a non-zero value if the GC doesn't support heap walking
2153 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
2158 hwi.callback = callback;
2161 sgen_clear_nursery_fragments ();
2162 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data, walk_references, &hwi, FALSE, TRUE);
2164 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, walk_references, &hwi);
2165 sgen_los_iterate_objects (walk_references, &hwi);
2175 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
2177 gc_callbacks = *callbacks;
2181 mono_gc_get_gc_callbacks ()
2183 return &gc_callbacks;
2187 sgen_client_thread_register (SgenThreadInfo* info, void *stack_bottom_fallback)
2190 guint8 *staddr = NULL;
2192 mono_tls_set_sgen_thread_info (info);
2194 info->client_info.skip = 0;
2196 info->client_info.stack_start = NULL;
2198 #ifdef SGEN_POSIX_STW
2199 info->client_info.stop_count = -1;
2200 info->client_info.signal = 0;
2203 mono_thread_info_get_stack_bounds (&staddr, &stsize);
2205 info->client_info.stack_start_limit = staddr;
2206 info->client_info.stack_end = staddr + stsize;
2208 gsize stack_bottom = (gsize)stack_bottom_fallback;
2209 stack_bottom += 4095;
2210 stack_bottom &= ~4095;
2211 info->client_info.stack_end = (char*)stack_bottom;
2214 memset (&info->client_info.ctx, 0, sizeof (MonoContext));
2216 if (mono_gc_get_gc_callbacks ()->thread_attach_func)
2217 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2219 binary_protocol_thread_register ((gpointer)mono_thread_info_get_tid (info));
2221 SGEN_LOG (3, "registered thread %p (%p) stack end %p", info, (gpointer)mono_thread_info_get_tid (info), info->client_info.stack_end);
2223 info->client_info.info.handle_stack = mono_handle_stack_alloc ();
2227 sgen_client_thread_unregister (SgenThreadInfo *p)
2229 MonoNativeThreadId tid;
2231 mono_tls_set_sgen_thread_info (NULL);
2233 tid = mono_thread_info_get_tid (p);
2235 if (p->client_info.info.runtime_thread)
2236 mono_threads_add_joinable_thread ((gpointer)tid);
2238 if (mono_gc_get_gc_callbacks ()->thread_detach_func) {
2239 mono_gc_get_gc_callbacks ()->thread_detach_func (p->client_info.runtime_data);
2240 p->client_info.runtime_data = NULL;
2243 binary_protocol_thread_unregister ((gpointer)tid);
2244 SGEN_LOG (3, "unregister thread %p (%p)", p, (gpointer)tid);
2246 HandleStack *handles = (HandleStack*) p->client_info.info.handle_stack;
2247 p->client_info.info.handle_stack = NULL;
2248 mono_handle_stack_free (handles);
2252 mono_gc_set_skip_thread (gboolean skip)
2254 SgenThreadInfo *info = mono_thread_info_current ();
2257 info->client_info.gc_disabled = skip;
2261 /* If we skip scanning a thread with a non-empty handle stack, we may move an
2262 * object but fail to update the reference in the handle.
2264 HandleStack *stack = info->client_info.info.handle_stack;
2265 g_assert (stack == NULL || mono_handle_stack_is_empty (stack));
2270 thread_in_critical_region (SgenThreadInfo *info)
2272 return info->client_info.in_critical_region;
2276 sgen_thread_attach (SgenThreadInfo *info)
2278 if (mono_gc_get_gc_callbacks ()->thread_attach_func && !info->client_info.runtime_data)
2279 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2283 sgen_thread_detach (SgenThreadInfo *p)
2285 /* If a delegate is passed to native code and invoked on a thread we dont
2286 * know about, marshal will register it with mono_threads_attach_coop, but
2287 * we have no way of knowing when that thread goes away. SGen has a TSD
2288 * so we assume that if the domain is still registered, we can detach
2291 if (mono_thread_internal_current_is_attached ())
2292 mono_thread_detach_internal (mono_thread_internal_current ());
2296 mono_gc_register_thread (void *baseptr)
2298 return mono_thread_info_attach (baseptr) != NULL;
2302 mono_gc_is_gc_thread (void)
2306 result = mono_thread_info_current () != NULL;
2312 sgen_client_thread_register_worker (void)
2314 mono_thread_info_register_small_id ();
2315 mono_native_thread_set_name (mono_native_thread_id_get (), "SGen worker");
2318 /* Variables holding start/end nursery so it won't have to be passed at every call */
2319 static void *scan_area_arg_start, *scan_area_arg_end;
2322 mono_gc_conservatively_scan_area (void *start, void *end)
2324 sgen_conservatively_pin_objects_from ((void **)start, (void **)end, scan_area_arg_start, scan_area_arg_end, PIN_TYPE_STACK);
2328 mono_gc_scan_object (void *obj, void *gc_data)
2330 ScanCopyContext *ctx = (ScanCopyContext *)gc_data;
2331 ctx->ops->copy_or_mark_object ((GCObject**)&obj, ctx->queue);
2336 void **start_nursery;
2338 } PinHandleStackInteriorPtrData;
2340 /* Called when we're scanning the handle stack imprecisely and we encounter a pointer into the
2341 middle of an object.
2344 pin_handle_stack_interior_ptrs (void **ptr_slot, void *user_data)
2346 PinHandleStackInteriorPtrData *ud = (PinHandleStackInteriorPtrData *)user_data;
2347 sgen_conservatively_pin_objects_from (ptr_slot, ptr_slot+1, ud->start_nursery, ud->end_nursery, PIN_TYPE_STACK);
2352 * Mark from thread stacks and registers.
2355 sgen_client_scan_thread_data (void *start_nursery, void *end_nursery, gboolean precise, ScanCopyContext ctx)
2357 scan_area_arg_start = start_nursery;
2358 scan_area_arg_end = end_nursery;
2360 FOREACH_THREAD (info) {
2361 int skip_reason = 0;
2362 void *aligned_stack_start;
2364 if (info->client_info.skip) {
2365 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);
2367 } else if (info->client_info.gc_disabled) {
2368 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);
2370 } else if (!mono_thread_info_is_live (info)) {
2371 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);
2373 } else if (!info->client_info.stack_start) {
2374 SGEN_LOG (3, "Skipping starting or detaching thread %p", info);
2378 binary_protocol_scan_stack ((gpointer)mono_thread_info_get_tid (info), info->client_info.stack_start, info->client_info.stack_end, skip_reason);
2382 /* If we skip a thread with a non-empty handle stack and then it
2383 * resumes running we may potentially move an object but fail to
2384 * update the reference in the handle.
2386 HandleStack *stack = info->client_info.info.handle_stack;
2387 g_assert (stack == NULL || mono_handle_stack_is_empty (stack));
2392 g_assert (info->client_info.stack_start);
2393 g_assert (info->client_info.stack_end);
2395 aligned_stack_start = (void*)(mword) ALIGN_TO ((mword)info->client_info.stack_start, SIZEOF_VOID_P);
2397 /* Windows uses a guard page before the committed stack memory pages to detect when the
2398 stack needs to be grown. If we suspend a thread just after a function prolog has
2399 decremented the stack pointer to point into the guard page but before the thread has
2400 been able to read or write to that page, starting the stack scan at aligned_stack_start
2401 will raise a STATUS_GUARD_PAGE_VIOLATION and the process will crash. This code uses
2402 VirtualQuery() to determine whether stack_start points into the guard page and then
2403 updates aligned_stack_start to point at the next non-guard page. */
2404 MEMORY_BASIC_INFORMATION mem_info;
2405 SIZE_T result = VirtualQuery(info->client_info.stack_start, &mem_info, sizeof(mem_info));
2406 g_assert (result != 0);
2407 if (mem_info.Protect & PAGE_GUARD) {
2408 aligned_stack_start = ((char*) mem_info.BaseAddress) + mem_info.RegionSize;
2412 g_assert (info->client_info.suspend_done);
2413 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 ());
2414 if (mono_gc_get_gc_callbacks ()->thread_mark_func && !conservative_stack_mark) {
2415 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);
2416 } else if (!precise) {
2417 if (!conservative_stack_mark) {
2418 fprintf (stderr, "Precise stack mark not supported - disabling.\n");
2419 conservative_stack_mark = TRUE;
2421 //FIXME we should eventually use the new stack_mark from coop
2422 sgen_conservatively_pin_objects_from ((void **)aligned_stack_start, (void **)info->client_info.stack_end, start_nursery, end_nursery, PIN_TYPE_STACK);
2426 sgen_conservatively_pin_objects_from ((void**)&info->client_info.ctx, (void**)(&info->client_info.ctx + 1),
2427 start_nursery, end_nursery, PIN_TYPE_STACK);
2430 // This is used on Coop GC for platforms where we cannot get the data for individual registers.
2431 // We force a spill of all registers into the stack and pass a chunk of data into sgen.
2432 //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
2433 MonoThreadUnwindState *state = &info->client_info.info.thread_saved_state [SELF_SUSPEND_STATE_INDEX];
2434 if (state && state->gc_stackdata) {
2435 sgen_conservatively_pin_objects_from ((void **)state->gc_stackdata, (void**)((char*)state->gc_stackdata + state->gc_stackdata_size),
2436 start_nursery, end_nursery, PIN_TYPE_STACK);
2440 if (info->client_info.info.handle_stack) {
2442 Make two passes over the handle stack. On the imprecise pass, pin all
2443 objects where the handle points into the interior of the object. On the
2444 precise pass, copy or mark all the objects that have handles to the
2445 beginning of the object.
2448 mono_handle_stack_scan ((HandleStack*)info->client_info.info.handle_stack, (GcScanFunc)ctx.ops->copy_or_mark_object, ctx.queue, precise);
2450 PinHandleStackInteriorPtrData ud = { .start_nursery = start_nursery,
2451 .end_nursery = end_nursery,
2453 mono_handle_stack_scan ((HandleStack*)info->client_info.info.handle_stack, pin_handle_stack_interior_ptrs, &ud, precise);
2456 } FOREACH_THREAD_END
2460 * mono_gc_set_stack_end:
2462 * Set the end of the current threads stack to STACK_END. The stack space between
2463 * STACK_END and the real end of the threads stack will not be scanned during collections.
2466 mono_gc_set_stack_end (void *stack_end)
2468 SgenThreadInfo *info;
2471 info = mono_thread_info_current ();
2473 SGEN_ASSERT (0, stack_end < info->client_info.stack_end, "Can only lower stack end");
2474 info->client_info.stack_end = stack_end;
2484 mono_gc_register_root (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2486 return sgen_register_root (start, size, descr, descr ? ROOT_TYPE_NORMAL : ROOT_TYPE_PINNED, source, msg);
2490 mono_gc_register_root_wbarrier (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2492 return sgen_register_root (start, size, descr, ROOT_TYPE_WBARRIER, source, msg);
2496 mono_gc_deregister_root (char* addr)
2498 sgen_deregister_root (addr);
2507 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
2511 mono_threads_join_lock ();
2512 res = pthread_create (new_thread, attr, start_routine, arg);
2513 mono_threads_join_unlock ();
2524 sgen_client_total_allocated_heap_changed (size_t allocated_heap)
2526 mono_runtime_resource_check_limit (MONO_RESOURCE_GC_HEAP, allocated_heap);
2530 mono_gc_user_markers_supported (void)
2536 mono_object_is_alive (MonoObject* o)
2542 mono_gc_get_generation (MonoObject *obj)
2544 if (sgen_ptr_in_nursery (obj))
2550 mono_gc_get_gc_name (void)
2556 mono_gc_get_description (void)
2558 #ifdef HAVE_CONC_GC_AS_DEFAULT
2559 return g_strdup ("sgen (concurrent by default)");
2561 return g_strdup ("sgen");
2566 mono_gc_set_desktop_mode (void)
2571 mono_gc_is_moving (void)
2577 mono_gc_is_disabled (void)
2583 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
2590 mono_gc_max_generation (void)
2596 mono_gc_precise_stack_mark_enabled (void)
2598 return !conservative_stack_mark;
2602 mono_gc_collect (int generation)
2604 sgen_gc_collect (generation);
2608 mono_gc_collection_count (int generation)
2610 return sgen_gc_collection_count (generation);
2614 mono_gc_get_used_size (void)
2616 return (int64_t)sgen_gc_get_used_size ();
2620 mono_gc_get_heap_size (void)
2622 return (int64_t)sgen_gc_get_total_heap_allocation ();
2626 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
2628 return sgen_make_user_root_descriptor (marker);
2632 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
2634 return SGEN_DESC_STRING;
2638 mono_gc_get_nursery (int *shift_bits, size_t *size)
2640 *size = sgen_nursery_size;
2641 *shift_bits = DEFAULT_NURSERY_BITS;
2642 return sgen_get_nursery_start ();
2646 mono_gc_get_los_limit (void)
2648 return SGEN_MAX_SMALL_OBJ_SIZE;
2652 sgen_client_default_metadata (void)
2654 return mono_domain_get ();
2658 sgen_client_metadata_for_object (GCObject *obj)
2660 return mono_object_domain (obj);
2664 * mono_gchandle_is_in_domain:
2665 * @gchandle: a GCHandle's handle.
2666 * @domain: An application domain.
2668 * Returns: TRUE if the object wrapped by the @gchandle belongs to the specific @domain.
2671 mono_gchandle_is_in_domain (guint32 gchandle, MonoDomain *domain)
2673 MonoDomain *gchandle_domain = (MonoDomain *)sgen_gchandle_get_metadata (gchandle);
2674 return domain->domain_id == gchandle_domain->domain_id;
2678 * mono_gchandle_free_domain:
2679 * @unloading: domain that is unloading
2681 * Function used internally to cleanup any GC handle for objects belonging
2682 * to the specified domain during appdomain unload.
2685 mono_gchandle_free_domain (MonoDomain *unloading)
2690 null_link_if_in_domain (gpointer hidden, GCHandleType handle_type, int max_generation, gpointer user)
2692 MonoDomain *unloading_domain = (MonoDomain *)user;
2693 MonoDomain *obj_domain;
2694 gboolean is_weak = MONO_GC_HANDLE_TYPE_IS_WEAK (handle_type);
2695 if (MONO_GC_HANDLE_IS_OBJECT_POINTER (hidden)) {
2696 MonoObject *obj = (MonoObject *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2697 obj_domain = mono_object_domain (obj);
2699 obj_domain = (MonoDomain *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2701 if (unloading_domain->domain_id == obj_domain->domain_id)
2707 sgen_null_links_for_domain (MonoDomain *domain)
2710 for (type = HANDLE_TYPE_MIN; type < HANDLE_TYPE_MAX; ++type)
2711 sgen_gchandle_iterate ((GCHandleType)type, GENERATION_OLD, null_link_if_in_domain, domain);
2715 mono_gchandle_set_target (guint32 gchandle, MonoObject *obj)
2717 sgen_gchandle_set_target (gchandle, obj);
2721 sgen_client_gchandle_created (int handle_type, GCObject *obj, guint32 handle)
2723 #ifndef DISABLE_PERFCOUNTERS
2724 mono_perfcounters->gc_num_handles++;
2726 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_CREATED, handle_type, handle, obj);
2730 sgen_client_gchandle_destroyed (int handle_type, guint32 handle)
2732 #ifndef DISABLE_PERFCOUNTERS
2733 mono_perfcounters->gc_num_handles--;
2735 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_DESTROYED, handle_type, handle, NULL);
2739 sgen_client_ensure_weak_gchandles_accessible (void)
2742 * During the second bridge processing step the world is
2743 * running again. That step processes all weak links once
2744 * more to null those that refer to dead objects. Before that
2745 * is completed, those links must not be followed, so we
2746 * conservatively wait for bridge processing when any weak
2747 * link is dereferenced.
2749 /* FIXME: A GC can occur after this check fails, in which case we
2750 * should wait for bridge processing but would fail to do so.
2752 if (G_UNLIKELY (bridge_processing_in_progress))
2753 mono_gc_wait_for_bridge_processing ();
2757 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
2761 result = func (data);
2762 UNLOCK_INTERRUPTION;
2767 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
2773 mono_gc_get_card_table (int *shift_bits, gpointer *mask)
2775 return sgen_get_card_table_configuration (shift_bits, mask);
2779 mono_gc_card_table_nursery_check (void)
2781 return !sgen_get_major_collector ()->is_concurrent;
2784 /* Negative value to remove */
2786 mono_gc_add_memory_pressure (gint64 value)
2788 /* FIXME: Implement at some point? */
2796 sgen_client_degraded_allocation (size_t size)
2798 static int last_major_gc_warned = -1;
2799 static int num_degraded = 0;
2801 if (last_major_gc_warned < (int)gc_stats.major_gc_count) {
2803 if (num_degraded == 1 || num_degraded == 3)
2804 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Degraded allocation. Consider increasing nursery-size if the warning persists.");
2805 else if (num_degraded == 10)
2806 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Repeated degraded allocation. Consider increasing nursery-size.");
2807 last_major_gc_warned = gc_stats.major_gc_count;
2816 sgen_client_description_for_internal_mem_type (int type)
2819 case INTERNAL_MEM_EPHEMERON_LINK: return "ephemeron-link";
2820 case INTERNAL_MEM_MOVED_OBJECT: return "moved-object";
2827 sgen_client_pre_collection_checks (void)
2829 if (sgen_mono_xdomain_checks) {
2830 sgen_clear_nursery_fragments ();
2831 sgen_check_for_xdomain_refs ();
2836 sgen_client_vtable_is_inited (MonoVTable *vt)
2838 return vt->klass->inited;
2842 sgen_client_vtable_get_namespace (MonoVTable *vt)
2844 return vt->klass->name_space;
2848 sgen_client_vtable_get_name (MonoVTable *vt)
2850 return vt->klass->name;
2858 sgen_client_init (void)
2861 MonoThreadInfoCallbacks cb;
2863 cb.thread_register = sgen_thread_register;
2864 cb.thread_detach = sgen_thread_detach;
2865 cb.thread_unregister = sgen_thread_unregister;
2866 cb.thread_attach = sgen_thread_attach;
2867 cb.mono_thread_in_critical_region = thread_in_critical_region;
2868 cb.ip_in_critical_region = ip_in_critical_region;
2870 mono_threads_init (&cb, sizeof (SgenThreadInfo));
2872 ///* Keep this the default for now */
2873 /* Precise marking is broken on all supported targets. Disable until fixed. */
2874 conservative_stack_mark = TRUE;
2876 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_EPHEMERON_LINK, sizeof (EphemeronLinkNode));
2878 mono_sgen_init_stw ();
2880 mono_tls_init_gc_keys ();
2882 mono_gc_register_thread (&dummy);
2886 sgen_client_handle_gc_param (const char *opt)
2888 if (g_str_has_prefix (opt, "stack-mark=")) {
2889 opt = strchr (opt, '=') + 1;
2890 if (!strcmp (opt, "precise")) {
2891 conservative_stack_mark = FALSE;
2892 } else if (!strcmp (opt, "conservative")) {
2893 conservative_stack_mark = TRUE;
2895 sgen_env_var_error (MONO_GC_PARAMS_NAME, conservative_stack_mark ? "Using `conservative`." : "Using `precise`.",
2896 "Invalid value `%s` for `stack-mark` option, possible values are: `precise`, `conservative`.", opt);
2898 } else if (g_str_has_prefix (opt, "bridge-implementation=")) {
2899 opt = strchr (opt, '=') + 1;
2900 sgen_set_bridge_implementation (opt);
2901 } else if (g_str_has_prefix (opt, "toggleref-test")) {
2902 /* FIXME: This should probably in MONO_GC_DEBUG */
2903 sgen_register_test_toggleref_callback ();
2904 } else if (!sgen_bridge_handle_gc_param (opt)) {
2911 sgen_client_print_gc_params_usage (void)
2913 fprintf (stderr, " stack-mark=MARK-METHOD (where MARK-METHOD is 'precise' or 'conservative')\n");
2917 sgen_client_handle_gc_debug (const char *opt)
2919 if (!strcmp (opt, "xdomain-checks")) {
2920 sgen_mono_xdomain_checks = TRUE;
2921 } else if (!strcmp (opt, "do-not-finalize")) {
2922 mono_do_not_finalize = TRUE;
2923 } else if (g_str_has_prefix (opt, "do-not-finalize=")) {
2924 opt = strchr (opt, '=') + 1;
2925 mono_do_not_finalize = TRUE;
2926 mono_do_not_finalize_class_names = g_strsplit (opt, ",", 0);
2927 } else if (!strcmp (opt, "log-finalizers")) {
2928 log_finalizers = TRUE;
2929 } else if (!strcmp (opt, "no-managed-allocator")) {
2930 sgen_set_use_managed_allocator (FALSE);
2931 } else if (!sgen_bridge_handle_gc_debug (opt)) {
2938 sgen_client_print_gc_debug_usage (void)
2940 fprintf (stderr, " xdomain-checks\n");
2941 fprintf (stderr, " do-not-finalize\n");
2942 fprintf (stderr, " log-finalizers\n");
2943 fprintf (stderr, " no-managed-allocator\n");
2944 sgen_bridge_print_gc_debug_usage ();
2949 sgen_client_get_provenance (void)
2951 #ifdef SGEN_OBJECT_PROVENANCE
2952 MonoGCCallbacks *cb = mono_gc_get_gc_callbacks ();
2953 gpointer (*get_provenance_func) (void);
2956 get_provenance_func = cb->get_provenance_func;
2957 if (get_provenance_func)
2958 return get_provenance_func ();
2966 sgen_client_describe_invalid_pointer (GCObject *ptr)
2968 sgen_bridge_describe_pointer (ptr);
2971 static gboolean gc_inited;
2974 mono_gc_base_init (void)
2979 mono_counters_init ();
2982 mono_w32handle_init ();
2985 #ifdef HEAVY_STATISTICS
2986 mono_counters_register ("los marked cards", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_marked_cards);
2987 mono_counters_register ("los array cards scanned ", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_cards);
2988 mono_counters_register ("los array remsets", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_remsets);
2990 mono_counters_register ("WBarrier set arrayref", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_set_arrayref);
2991 mono_counters_register ("WBarrier value copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_value_copy);
2992 mono_counters_register ("WBarrier object copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_object_copy);
3001 mono_gc_base_cleanup (void)
3003 sgen_thread_pool_shutdown ();
3005 // We should have consumed any outstanding moves.
3006 g_assert (sgen_pointer_queue_is_empty (&moved_objects_queue));
3010 mono_gc_is_null (void)