3 * SGen features specific to Mono.
5 * Copyright (C) 2014 Xamarin Inc
7 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
13 #include "sgen/sgen-gc.h"
14 #include "sgen/sgen-protocol.h"
15 #include "metadata/monitor.h"
16 #include "sgen/sgen-layout-stats.h"
17 #include "sgen/sgen-client.h"
18 #include "sgen/sgen-cardtable.h"
19 #include "sgen/sgen-pinning.h"
20 #include "sgen/sgen-workers.h"
21 #include "metadata/marshal.h"
22 #include "metadata/method-builder.h"
23 #include "metadata/abi-details.h"
24 #include "metadata/mono-gc.h"
25 #include "metadata/runtime.h"
26 #include "metadata/sgen-bridge-internals.h"
27 #include "metadata/gc-internals.h"
28 #include "metadata/handle.h"
29 #include "utils/mono-memory-model.h"
30 #include "utils/mono-logger-internals.h"
31 #include "utils/mono-threads-coop.h"
32 #include "utils/mono-threads.h"
33 #include "metadata/w32handle.h"
35 #ifdef HEAVY_STATISTICS
36 static guint64 stat_wbarrier_set_arrayref = 0;
37 static guint64 stat_wbarrier_value_copy = 0;
38 static guint64 stat_wbarrier_object_copy = 0;
40 static guint64 los_marked_cards;
41 static guint64 los_array_cards;
42 static guint64 los_array_remsets;
45 /* If set, mark stacks conservatively, even if precise marking is possible */
46 static gboolean conservative_stack_mark = FALSE;
47 /* If set, check that there are no references to the domain left at domain unload */
48 gboolean sgen_mono_xdomain_checks = FALSE;
50 /* Functions supplied by the runtime to be called by the GC */
51 static MonoGCCallbacks gc_callbacks;
53 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
55 #define OPDEF(a,b,c,d,e,f,g,h,i,j) \
59 #include "mono/cil/opcode.def"
70 ptr_on_stack (void *ptr)
72 gpointer stack_start = &stack_start;
73 SgenThreadInfo *info = mono_thread_info_current ();
75 if (ptr >= stack_start && ptr < (gpointer)info->client_info.stack_end)
80 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
82 #define HANDLE_PTR(ptr,obj) do { \
83 gpointer o = *(gpointer*)(ptr); \
85 gpointer d = ((char*)dest) + ((char*)(ptr) - (char*)(obj)); \
86 binary_protocol_wbarrier (d, o, (gpointer) SGEN_LOAD_VTABLE (o)); \
91 scan_object_for_binary_protocol_copy_wbarrier (gpointer dest, char *start, mword desc)
93 #define SCAN_OBJECT_NOVTABLE
94 #include "sgen/sgen-scan-object.h"
99 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
101 HEAVY_STAT (++stat_wbarrier_value_copy);
102 g_assert (klass->valuetype);
104 SGEN_LOG (8, "Adding value remset at %p, count %d, descr %p for class %s (%p)", dest, count, (gpointer)klass->gc_descr, klass->name, klass);
106 if (sgen_ptr_in_nursery (dest) || ptr_on_stack (dest) || !sgen_gc_descr_has_references ((mword)klass->gc_descr)) {
107 size_t element_size = mono_class_value_size (klass, NULL);
108 size_t size = count * element_size;
109 mono_gc_memmove_atomic (dest, src, size);
113 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
114 if (binary_protocol_is_heavy_enabled ()) {
115 size_t element_size = mono_class_value_size (klass, NULL);
117 for (i = 0; i < count; ++i) {
118 scan_object_for_binary_protocol_copy_wbarrier ((char*)dest + i * element_size,
119 (char*)src + i * element_size - sizeof (MonoObject),
120 (mword) klass->gc_descr);
125 sgen_get_remset ()->wbarrier_value_copy (dest, src, count, mono_class_value_size (klass, NULL));
129 * mono_gc_wbarrier_object_copy:
131 * Write barrier to call when \p obj is the result of a clone or copy of an object.
134 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
138 HEAVY_STAT (++stat_wbarrier_object_copy);
140 SGEN_ASSERT (6, !ptr_on_stack (obj), "Why is this called for a non-reference type?");
141 if (sgen_ptr_in_nursery (obj) || !SGEN_OBJECT_HAS_REFERENCES (src)) {
142 size = mono_object_class (obj)->instance_size;
143 mono_gc_memmove_aligned ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
144 size - sizeof (MonoObject));
148 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
149 if (binary_protocol_is_heavy_enabled ())
150 scan_object_for_binary_protocol_copy_wbarrier (obj, (char*)src, (mword) src->vtable->gc_descr);
153 sgen_get_remset ()->wbarrier_object_copy (obj, src);
157 * mono_gc_wbarrier_set_arrayref:
160 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
162 HEAVY_STAT (++stat_wbarrier_set_arrayref);
163 if (sgen_ptr_in_nursery (slot_ptr)) {
164 *(void**)slot_ptr = value;
167 SGEN_LOG (8, "Adding remset at %p", slot_ptr);
169 binary_protocol_wbarrier (slot_ptr, value, value->vtable);
171 sgen_get_remset ()->wbarrier_set_field ((GCObject*)arr, slot_ptr, value);
175 * mono_gc_wbarrier_set_field:
178 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
180 mono_gc_wbarrier_set_arrayref ((MonoArray*)obj, field_ptr, value);
184 mono_gc_wbarrier_range_copy (gpointer _dest, gpointer _src, int size)
186 sgen_wbarrier_range_copy (_dest, _src, size);
190 mono_gc_get_range_copy_func (void)
192 return sgen_get_remset ()->wbarrier_range_copy;
196 mono_gc_get_suspend_signal (void)
198 return mono_threads_suspend_get_suspend_signal ();
202 mono_gc_get_restart_signal (void)
204 return mono_threads_suspend_get_restart_signal ();
207 static MonoMethod *write_barrier_conc_method;
208 static MonoMethod *write_barrier_noconc_method;
211 sgen_is_critical_method (MonoMethod *method)
213 return sgen_is_managed_allocator (method);
217 sgen_has_critical_method (void)
219 return sgen_has_managed_allocator ();
223 ip_in_critical_region (MonoDomain *domain, gpointer ip)
229 * We pass false for 'try_aot' so this becomes async safe.
230 * It won't find aot methods whose jit info is not yet loaded,
231 * so we preload their jit info in the JIT.
233 ji = mono_jit_info_table_find_internal (domain, ip, FALSE, FALSE);
237 method = mono_jit_info_get_method (ji);
239 return mono_runtime_is_critical_method (method) || sgen_is_critical_method (method);
243 mono_gc_is_critical_method (MonoMethod *method)
245 return sgen_is_critical_method (method);
251 emit_nursery_check (MonoMethodBuilder *mb, int *nursery_check_return_labels, gboolean is_concurrent)
253 int shifted_nursery_start = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
255 memset (nursery_check_return_labels, 0, sizeof (int) * 2);
256 // if (ptr_in_nursery (ptr)) return;
258 * Masking out the bits might be faster, but we would have to use 64 bit
259 * immediates, which might be slower.
261 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
262 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_START);
263 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
264 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
265 mono_mb_emit_byte (mb, CEE_SHR_UN);
266 mono_mb_emit_stloc (mb, shifted_nursery_start);
268 mono_mb_emit_ldarg (mb, 0);
269 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
270 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
271 mono_mb_emit_byte (mb, CEE_SHR_UN);
272 mono_mb_emit_ldloc (mb, shifted_nursery_start);
273 nursery_check_return_labels [0] = mono_mb_emit_branch (mb, CEE_BEQ);
275 if (!is_concurrent) {
276 // if (!ptr_in_nursery (*ptr)) return;
277 mono_mb_emit_ldarg (mb, 0);
278 mono_mb_emit_byte (mb, CEE_LDIND_I);
279 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
280 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
281 mono_mb_emit_byte (mb, CEE_SHR_UN);
282 mono_mb_emit_ldloc (mb, shifted_nursery_start);
283 nursery_check_return_labels [1] = mono_mb_emit_branch (mb, CEE_BNE_UN);
289 mono_gc_get_specific_write_barrier (gboolean is_concurrent)
292 MonoMethodBuilder *mb;
293 MonoMethodSignature *sig;
294 MonoMethod **write_barrier_method_addr;
296 #ifdef MANAGED_WBARRIER
297 int i, nursery_check_labels [2];
300 // FIXME: Maybe create a separate version for ctors (the branch would be
301 // correctly predicted more times)
303 write_barrier_method_addr = &write_barrier_conc_method;
305 write_barrier_method_addr = &write_barrier_noconc_method;
307 if (*write_barrier_method_addr)
308 return *write_barrier_method_addr;
310 /* Create the IL version of mono_gc_barrier_generic_store () */
311 sig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
312 sig->ret = &mono_defaults.void_class->byval_arg;
313 sig->params [0] = &mono_defaults.int_class->byval_arg;
316 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_conc", MONO_WRAPPER_WRITE_BARRIER);
318 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_noconc", MONO_WRAPPER_WRITE_BARRIER);
321 #ifdef MANAGED_WBARRIER
322 emit_nursery_check (mb, nursery_check_labels, is_concurrent);
324 addr = sgen_cardtable + ((address >> CARD_BITS) & CARD_MASK)
328 LDC_PTR sgen_cardtable
334 if (SGEN_HAVE_OVERLAPPING_CARDS) {
335 LDC_PTR card_table_mask
342 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
343 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_CARD_TABLE);
344 mono_mb_emit_ldarg (mb, 0);
345 mono_mb_emit_icon (mb, CARD_BITS);
346 mono_mb_emit_byte (mb, CEE_SHR_UN);
347 mono_mb_emit_byte (mb, CEE_CONV_I);
348 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
349 #if SIZEOF_VOID_P == 8
350 mono_mb_emit_icon8 (mb, CARD_MASK);
352 mono_mb_emit_icon (mb, CARD_MASK);
354 mono_mb_emit_byte (mb, CEE_CONV_I);
355 mono_mb_emit_byte (mb, CEE_AND);
357 mono_mb_emit_byte (mb, CEE_ADD);
358 mono_mb_emit_icon (mb, 1);
359 mono_mb_emit_byte (mb, CEE_STIND_I1);
362 for (i = 0; i < 2; ++i) {
363 if (nursery_check_labels [i])
364 mono_mb_patch_branch (mb, nursery_check_labels [i]);
366 mono_mb_emit_byte (mb, CEE_RET);
368 mono_mb_emit_ldarg (mb, 0);
369 mono_mb_emit_icall (mb, mono_gc_wbarrier_generic_nostore);
370 mono_mb_emit_byte (mb, CEE_RET);
373 res = mono_mb_create_method (mb, sig, 16);
374 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
375 mono_marshal_set_wrapper_info (res, info);
379 if (*write_barrier_method_addr) {
380 /* Already created */
381 mono_free_method (res);
383 /* double-checked locking */
384 mono_memory_barrier ();
385 *write_barrier_method_addr = res;
389 return *write_barrier_method_addr;
393 mono_gc_get_write_barrier (void)
395 return mono_gc_get_specific_write_barrier (major_collector.is_concurrent);
399 * Dummy filler objects
402 /* Vtable of the objects used to fill out nursery fragments before a collection */
403 static GCVTable array_fill_vtable;
406 get_array_fill_vtable (void)
408 if (!array_fill_vtable) {
409 static MonoClass klass;
410 static char _vtable[sizeof(MonoVTable)+8];
411 MonoVTable* vtable = (MonoVTable*) ALIGN_TO((mword)_vtable, 8);
414 MonoDomain *domain = mono_get_root_domain ();
417 klass.element_class = mono_defaults.byte_class;
419 klass.instance_size = MONO_SIZEOF_MONO_ARRAY;
420 klass.sizes.element_size = 1;
421 klass.name = "array_filler_type";
423 vtable->klass = &klass;
425 vtable->gc_descr = mono_gc_make_descr_for_array (TRUE, &bmap, 0, 1);
428 array_fill_vtable = vtable;
430 return array_fill_vtable;
434 sgen_client_array_fill_range (char *start, size_t size)
438 if (size < MONO_SIZEOF_MONO_ARRAY) {
439 memset (start, 0, size);
443 o = (MonoArray*)start;
444 o->obj.vtable = (MonoVTable*)get_array_fill_vtable ();
445 /* Mark this as not a real object */
446 o->obj.synchronisation = (MonoThreadsSync *)GINT_TO_POINTER (-1);
448 o->max_length = (mono_array_size_t)(size - MONO_SIZEOF_MONO_ARRAY);
454 sgen_client_zero_array_fill_header (void *p, size_t size)
456 if (size >= MONO_SIZEOF_MONO_ARRAY) {
457 memset (p, 0, MONO_SIZEOF_MONO_ARRAY);
459 static guint8 zeros [MONO_SIZEOF_MONO_ARRAY];
461 SGEN_ASSERT (0, !memcmp (p, zeros, size), "TLAB segment must be zeroed out.");
469 static MonoGCFinalizerCallbacks fin_callbacks;
472 mono_gc_get_vtable_bits (MonoClass *klass)
475 /* FIXME move this to the bridge code */
476 if (sgen_need_bridge_processing ()) {
477 switch (sgen_bridge_class_kind (klass)) {
478 case GC_BRIDGE_TRANSPARENT_BRIDGE_CLASS:
479 case GC_BRIDGE_OPAQUE_BRIDGE_CLASS:
480 res = SGEN_GC_BIT_BRIDGE_OBJECT;
482 case GC_BRIDGE_OPAQUE_CLASS:
483 res = SGEN_GC_BIT_BRIDGE_OPAQUE_OBJECT;
485 case GC_BRIDGE_TRANSPARENT_CLASS:
489 if (fin_callbacks.is_class_finalization_aware) {
490 if (fin_callbacks.is_class_finalization_aware (klass))
491 res |= SGEN_GC_BIT_FINALIZER_AWARE;
497 is_finalization_aware (MonoObject *obj)
499 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
500 return (vt->gc_bits & SGEN_GC_BIT_FINALIZER_AWARE) == SGEN_GC_BIT_FINALIZER_AWARE;
504 sgen_client_object_queued_for_finalization (GCObject *obj)
506 if (fin_callbacks.object_queued_for_finalization && is_finalization_aware (obj))
507 fin_callbacks.object_queued_for_finalization (obj);
510 if (G_UNLIKELY (MONO_GC_FINALIZE_ENQUEUE_ENABLED ())) {
511 int gen = sgen_ptr_in_nursery (obj) ? GENERATION_NURSERY : GENERATION_OLD;
512 GCVTable vt = SGEN_LOAD_VTABLE (obj);
513 MONO_GC_FINALIZE_ENQUEUE ((mword)obj, sgen_safe_object_get_size (obj),
514 sgen_client_vtable_get_namespace (vt), sgen_client_vtable_get_name (vt), gen,
515 sgen_client_object_has_critical_finalizer (obj));
521 mono_gc_register_finalizer_callbacks (MonoGCFinalizerCallbacks *callbacks)
523 if (callbacks->version != MONO_GC_FINALIZER_EXTENSION_VERSION)
524 g_error ("Invalid finalizer callback version. Expected %d but got %d\n", MONO_GC_FINALIZER_EXTENSION_VERSION, callbacks->version);
526 fin_callbacks = *callbacks;
530 sgen_client_run_finalize (MonoObject *obj)
532 mono_gc_run_finalize (obj, NULL);
536 * mono_gc_invoke_finalizers:
539 mono_gc_invoke_finalizers (void)
541 return sgen_gc_invoke_finalizers ();
545 * mono_gc_pending_finalizers:
548 mono_gc_pending_finalizers (void)
550 return sgen_have_pending_finalizers ();
554 sgen_client_finalize_notify (void)
556 mono_gc_finalize_notify ();
560 mono_gc_register_for_finalization (MonoObject *obj, void *user_data)
562 sgen_object_register_for_finalization (obj, user_data);
566 object_in_domain_predicate (MonoObject *obj, void *user_data)
568 MonoDomain *domain = (MonoDomain *)user_data;
569 if (mono_object_domain (obj) == domain) {
570 SGEN_LOG (5, "Unregistering finalizer for object: %p (%s)", obj, sgen_client_vtable_get_name (SGEN_LOAD_VTABLE (obj)));
577 * mono_gc_finalizers_for_domain:
578 * \param domain the unloading appdomain
579 * \param out_array output array
580 * \param out_size size of output array
581 * Enqueue for finalization all objects that belong to the unloading appdomain \p domain.
582 * \p suspend is used for early termination of the enqueuing process.
585 mono_gc_finalize_domain (MonoDomain *domain)
587 sgen_finalize_if (object_in_domain_predicate, domain);
591 mono_gc_suspend_finalizers (void)
593 sgen_set_suspend_finalizers ();
600 typedef struct _EphemeronLinkNode EphemeronLinkNode;
602 struct _EphemeronLinkNode {
603 EphemeronLinkNode *next;
612 static EphemeronLinkNode *ephemeron_list;
614 /* LOCKING: requires that the GC lock is held */
616 null_ephemerons_for_domain (MonoDomain *domain)
618 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
621 MonoObject *object = (MonoObject*)current->array;
624 SGEN_ASSERT (0, object->vtable, "Can't have objects without vtables.");
626 if (object && object->vtable->domain == domain) {
627 EphemeronLinkNode *tmp = current;
630 prev->next = current->next;
632 ephemeron_list = current->next;
634 current = current->next;
635 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
638 current = current->next;
643 /* LOCKING: requires that the GC lock is held */
645 sgen_client_clear_unreachable_ephemerons (ScanCopyContext ctx)
647 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
648 SgenGrayQueue *queue = ctx.queue;
649 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
650 Ephemeron *cur, *array_end;
654 MonoArray *array = current->array;
656 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
657 EphemeronLinkNode *tmp = current;
659 SGEN_LOG (5, "Dead Ephemeron array at %p", array);
662 prev->next = current->next;
664 ephemeron_list = current->next;
666 current = current->next;
667 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
672 copy_func ((GCObject**)&array, queue);
673 current->array = array;
675 SGEN_LOG (5, "Clearing unreachable entries for ephemeron array at %p", array);
677 cur = mono_array_addr (array, Ephemeron, 0);
678 array_end = cur + mono_array_length_fast (array);
679 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
681 for (; cur < array_end; ++cur) {
682 GCObject *key = cur->key;
684 if (!key || key == tombstone)
687 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
688 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
689 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
691 if (!sgen_is_object_alive_for_current_gen (key)) {
692 cur->key = tombstone;
698 current = current->next;
703 LOCKING: requires that the GC lock is held
705 Limitations: We scan all ephemerons on every collection since the current design doesn't allow for a simple nursery/mature split.
708 sgen_client_mark_ephemerons (ScanCopyContext ctx)
710 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
711 SgenGrayQueue *queue = ctx.queue;
712 gboolean nothing_marked = TRUE;
713 EphemeronLinkNode *current = ephemeron_list;
714 Ephemeron *cur, *array_end;
717 for (current = ephemeron_list; current; current = current->next) {
718 MonoArray *array = current->array;
719 SGEN_LOG (5, "Ephemeron array at %p", array);
721 /*It has to be alive*/
722 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
723 SGEN_LOG (5, "\tnot reachable");
727 copy_func ((GCObject**)&array, queue);
729 cur = mono_array_addr (array, Ephemeron, 0);
730 array_end = cur + mono_array_length_fast (array);
731 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
733 for (; cur < array_end; ++cur) {
734 GCObject *key = cur->key;
736 if (!key || key == tombstone)
739 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
740 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
741 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
743 if (sgen_is_object_alive_for_current_gen (key)) {
744 GCObject *value = cur->value;
746 copy_func (&cur->key, queue);
748 if (!sgen_is_object_alive_for_current_gen (value))
749 nothing_marked = FALSE;
750 copy_func (&cur->value, queue);
756 SGEN_LOG (5, "Ephemeron run finished. Is it done %d", nothing_marked);
757 return nothing_marked;
761 mono_gc_ephemeron_array_add (MonoObject *obj)
763 EphemeronLinkNode *node;
767 node = (EphemeronLinkNode *)sgen_alloc_internal (INTERNAL_MEM_EPHEMERON_LINK);
772 node->array = (MonoArray*)obj;
773 node->next = ephemeron_list;
774 ephemeron_list = node;
776 SGEN_LOG (5, "Registered ephemeron array %p", obj);
787 need_remove_object_for_domain (GCObject *start, MonoDomain *domain)
789 if (mono_object_domain (start) == domain) {
790 SGEN_LOG (4, "Need to cleanup object %p", start);
791 binary_protocol_cleanup (start, (gpointer)SGEN_LOAD_VTABLE (start), sgen_safe_object_get_size ((GCObject*)start));
798 process_object_for_domain_clearing (GCObject *start, MonoDomain *domain)
800 MonoVTable *vt = SGEN_LOAD_VTABLE (start);
801 if (vt->klass == mono_defaults.internal_thread_class)
802 g_assert (mono_object_domain (start) == mono_get_root_domain ());
803 /* The object could be a proxy for an object in the domain
805 #ifndef DISABLE_REMOTING
806 if (mono_defaults.real_proxy_class->supertypes && mono_class_has_parent_fast (vt->klass, mono_defaults.real_proxy_class)) {
807 MonoObject *server = ((MonoRealProxy*)start)->unwrapped_server;
809 /* The server could already have been zeroed out, so
810 we need to check for that, too. */
811 if (server && (!SGEN_LOAD_VTABLE (server) || mono_object_domain (server) == domain)) {
812 SGEN_LOG (4, "Cleaning up remote pointer in %p to object %p", start, server);
813 ((MonoRealProxy*)start)->unwrapped_server = NULL;
820 clear_domain_process_object (GCObject *obj, MonoDomain *domain)
824 process_object_for_domain_clearing (obj, domain);
825 remove = need_remove_object_for_domain (obj, domain);
827 if (remove && obj->synchronisation) {
828 guint32 dislink = mono_monitor_get_object_monitor_gchandle (obj);
830 mono_gchandle_free (dislink);
837 clear_domain_process_minor_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
839 if (clear_domain_process_object (obj, domain)) {
840 CANARIFY_SIZE (size);
841 memset (obj, 0, size);
846 clear_domain_process_major_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
848 clear_domain_process_object (obj, domain);
852 clear_domain_free_major_non_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
854 if (need_remove_object_for_domain (obj, domain))
855 major_collector.free_non_pinned_object (obj, size);
859 clear_domain_free_major_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
861 if (need_remove_object_for_domain (obj, domain))
862 major_collector.free_pinned_object (obj, size);
866 * When appdomains are unloaded we can easily remove objects that have finalizers,
867 * but all the others could still be present in random places on the heap.
868 * We need a sweep to get rid of them even though it's going to be costly
870 * The reason we need to remove them is because we access the vtable and class
871 * structures to know the object size and the reference bitmap: once the domain is
872 * unloaded the point to random memory.
875 mono_gc_clear_domain (MonoDomain * domain)
877 LOSObject *bigobj, *prev;
882 binary_protocol_domain_unload_begin (domain);
886 if (sgen_concurrent_collection_in_progress ())
887 sgen_perform_collection (0, GENERATION_OLD, "clear domain", TRUE, FALSE);
888 SGEN_ASSERT (0, !sgen_concurrent_collection_in_progress (), "We just ordered a synchronous collection. Why are we collecting concurrently?");
890 major_collector.finish_sweeping ();
892 sgen_process_fin_stage_entries ();
894 sgen_clear_nursery_fragments ();
896 if (sgen_mono_xdomain_checks && domain != mono_get_root_domain ()) {
897 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_NORMAL);
898 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_WBARRIER);
899 sgen_check_for_xdomain_refs ();
902 /*Ephemerons and dislinks must be processed before LOS since they might end up pointing
903 to memory returned to the OS.*/
904 null_ephemerons_for_domain (domain);
905 sgen_null_links_for_domain (domain);
907 for (i = GENERATION_NURSERY; i < GENERATION_MAX; ++i)
908 sgen_remove_finalizers_if (object_in_domain_predicate, domain, i);
910 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
911 (IterateObjectCallbackFunc)clear_domain_process_minor_object_callback, domain, FALSE, TRUE);
913 /* We need two passes over major and large objects because
914 freeing such objects might give their memory back to the OS
915 (in the case of large objects) or obliterate its vtable
916 (pinned objects with major-copying or pinned and non-pinned
917 objects with major-mark&sweep), but we might need to
918 dereference a pointer from an object to another object if
919 the first object is a proxy. */
920 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, (IterateObjectCallbackFunc)clear_domain_process_major_object_callback, domain);
921 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
922 clear_domain_process_object ((GCObject*)bigobj->data, domain);
925 for (bigobj = los_object_list; bigobj;) {
926 if (need_remove_object_for_domain ((GCObject*)bigobj->data, domain)) {
927 LOSObject *to_free = bigobj;
929 prev->next = bigobj->next;
931 los_object_list = bigobj->next;
932 bigobj = bigobj->next;
933 SGEN_LOG (4, "Freeing large object %p", bigobj->data);
934 sgen_los_free_object (to_free);
938 bigobj = bigobj->next;
940 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_NON_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_non_pinned_object_callback, domain);
941 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_pinned_object_callback, domain);
943 if (domain == mono_get_root_domain ()) {
944 sgen_pin_stats_report ();
945 sgen_object_layout_dump (stdout);
948 sgen_restart_world (0);
950 binary_protocol_domain_unload_end (domain);
951 binary_protocol_flush_buffers (FALSE);
961 mono_gc_alloc_obj (MonoVTable *vtable, size_t size)
963 MonoObject *obj = sgen_alloc_obj (vtable, size);
965 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
967 mono_profiler_allocation (obj);
974 mono_gc_alloc_pinned_obj (MonoVTable *vtable, size_t size)
976 MonoObject *obj = sgen_alloc_obj_pinned (vtable, size);
978 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
980 mono_profiler_allocation (obj);
987 mono_gc_alloc_mature (MonoVTable *vtable, size_t size)
989 MonoObject *obj = sgen_alloc_obj_mature (vtable, size);
991 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
993 mono_profiler_allocation (obj);
1000 * mono_gc_alloc_fixed:
1003 mono_gc_alloc_fixed (size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
1005 /* FIXME: do a single allocation */
1006 void *res = g_calloc (1, size);
1009 if (!mono_gc_register_root ((char *)res, size, descr, source, msg)) {
1017 * mono_gc_free_fixed:
1020 mono_gc_free_fixed (void* addr)
1022 mono_gc_deregister_root ((char *)addr);
1030 static MonoMethod* alloc_method_cache [ATYPE_NUM];
1031 static MonoMethod* slowpath_alloc_method_cache [ATYPE_NUM];
1032 static gboolean use_managed_allocator = TRUE;
1034 #ifdef MANAGED_ALLOCATION
1035 // Cache the SgenThreadInfo pointer in a local 'var'.
1036 #define EMIT_TLS_ACCESS_VAR(mb, var) \
1038 var = mono_mb_add_local ((mb), &mono_defaults.int_class->byval_arg); \
1039 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1040 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1041 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1042 mono_mb_emit_stloc ((mb), (var)); \
1045 #define EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR(mb, var) \
1047 mono_mb_emit_ldloc ((mb), (var)); \
1048 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenClientThreadInfo, in_critical_region)); \
1049 mono_mb_emit_byte ((mb), CEE_ADD); \
1052 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb, var) do { \
1053 mono_mb_emit_ldloc ((mb), (var)); \
1054 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_next)); \
1055 mono_mb_emit_byte ((mb), CEE_ADD); \
1058 #define EMIT_TLS_ACCESS_TEMP_END(mb, var) do { \
1059 mono_mb_emit_ldloc ((mb), (var)); \
1060 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_temp_end)); \
1061 mono_mb_emit_byte ((mb), CEE_ADD); \
1062 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1065 /* FIXME: Do this in the JIT, where specialized allocation sequences can be created
1066 * for each class. This is currently not easy to do, as it is hard to generate basic
1067 * blocks + branches, but it is easy with the linear IL codebase.
1069 * For this to work we'd need to solve the TLAB race, first. Now we
1070 * require the allocator to be in a few known methods to make sure
1071 * that they are executed atomically via the restart mechanism.
1074 create_allocator (int atype, ManagedAllocatorVariant variant)
1076 int p_var, size_var, real_size_var, thread_var G_GNUC_UNUSED;
1077 gboolean slowpath = variant == MANAGED_ALLOCATOR_SLOW_PATH;
1078 guint32 fastpath_branch, max_size_branch, no_oom_branch;
1079 MonoMethodBuilder *mb;
1081 MonoMethodSignature *csig;
1082 static gboolean registered = FALSE;
1083 int tlab_next_addr_var, new_next_var;
1084 const char *name = NULL;
1089 mono_register_jit_icall (mono_gc_alloc_obj, "mono_gc_alloc_obj", mono_create_icall_signature ("object ptr int"), FALSE);
1090 mono_register_jit_icall (mono_gc_alloc_vector, "mono_gc_alloc_vector", mono_create_icall_signature ("object ptr int int"), FALSE);
1091 mono_register_jit_icall (mono_gc_alloc_string, "mono_gc_alloc_string", mono_create_icall_signature ("object ptr int int32"), FALSE);
1095 if (atype == ATYPE_SMALL) {
1096 name = slowpath ? "SlowAllocSmall" : "AllocSmall";
1097 } else if (atype == ATYPE_NORMAL) {
1098 name = slowpath ? "SlowAlloc" : "Alloc";
1099 } else if (atype == ATYPE_VECTOR) {
1100 name = slowpath ? "SlowAllocVector" : "AllocVector";
1101 } else if (atype == ATYPE_STRING) {
1102 name = slowpath ? "SlowAllocString" : "AllocString";
1104 g_assert_not_reached ();
1107 if (atype == ATYPE_NORMAL)
1112 csig = mono_metadata_signature_alloc (mono_defaults.corlib, num_params);
1113 if (atype == ATYPE_STRING) {
1114 csig->ret = &mono_defaults.string_class->byval_arg;
1115 csig->params [0] = &mono_defaults.int_class->byval_arg;
1116 csig->params [1] = &mono_defaults.int32_class->byval_arg;
1118 csig->ret = &mono_defaults.object_class->byval_arg;
1119 for (i = 0; i < num_params; i++)
1120 csig->params [i] = &mono_defaults.int_class->byval_arg;
1123 mb = mono_mb_new (mono_defaults.object_class, name, MONO_WRAPPER_ALLOC);
1130 mono_mb_emit_ldarg (mb, 0);
1131 mono_mb_emit_icall (mb, ves_icall_object_new_specific);
1134 mono_mb_emit_ldarg (mb, 0);
1135 mono_mb_emit_ldarg (mb, 1);
1136 mono_mb_emit_icall (mb, ves_icall_array_new_specific);
1139 mono_mb_emit_ldarg (mb, 1);
1140 mono_mb_emit_icall (mb, ves_icall_string_alloc);
1143 g_assert_not_reached ();
1150 * Tls access might call foreign code or code without jinfo. This can
1151 * only happen if we are outside of the critical region.
1153 EMIT_TLS_ACCESS_VAR (mb, thread_var);
1155 size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1156 if (atype == ATYPE_SMALL) {
1157 /* size_var = size_arg */
1158 mono_mb_emit_ldarg (mb, 1);
1159 mono_mb_emit_stloc (mb, size_var);
1160 } else if (atype == ATYPE_NORMAL) {
1161 /* size = vtable->klass->instance_size; */
1162 mono_mb_emit_ldarg (mb, 0);
1163 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1164 mono_mb_emit_byte (mb, CEE_ADD);
1165 mono_mb_emit_byte (mb, CEE_LDIND_I);
1166 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, instance_size));
1167 mono_mb_emit_byte (mb, CEE_ADD);
1168 /* FIXME: assert instance_size stays a 4 byte integer */
1169 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1170 mono_mb_emit_byte (mb, CEE_CONV_I);
1171 mono_mb_emit_stloc (mb, size_var);
1172 } else if (atype == ATYPE_VECTOR) {
1173 MonoExceptionClause *clause;
1174 int pos, pos_leave, pos_error;
1175 MonoClass *oom_exc_class;
1179 * n > MONO_ARRAY_MAX_INDEX => OutOfMemoryException
1180 * n < 0 => OverflowException
1182 * We can do an unsigned comparison to catch both cases, then in the error
1183 * case compare signed to distinguish between them.
1185 mono_mb_emit_ldarg (mb, 1);
1186 mono_mb_emit_icon (mb, MONO_ARRAY_MAX_INDEX);
1187 mono_mb_emit_byte (mb, CEE_CONV_U);
1188 pos = mono_mb_emit_short_branch (mb, CEE_BLE_UN_S);
1190 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1191 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1192 mono_mb_emit_ldarg (mb, 1);
1193 mono_mb_emit_icon (mb, 0);
1194 pos_error = mono_mb_emit_short_branch (mb, CEE_BLT_S);
1195 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1196 mono_mb_patch_short_branch (mb, pos_error);
1197 mono_mb_emit_exception (mb, "OverflowException", NULL);
1199 mono_mb_patch_short_branch (mb, pos);
1201 clause = (MonoExceptionClause *)mono_image_alloc0 (mono_defaults.corlib, sizeof (MonoExceptionClause));
1202 clause->try_offset = mono_mb_get_label (mb);
1204 /* vtable->klass->sizes.element_size */
1205 mono_mb_emit_ldarg (mb, 0);
1206 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1207 mono_mb_emit_byte (mb, CEE_ADD);
1208 mono_mb_emit_byte (mb, CEE_LDIND_I);
1209 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, sizes));
1210 mono_mb_emit_byte (mb, CEE_ADD);
1211 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1212 mono_mb_emit_byte (mb, CEE_CONV_I);
1215 mono_mb_emit_ldarg (mb, 1);
1216 mono_mb_emit_byte (mb, CEE_MUL_OVF_UN);
1217 /* + sizeof (MonoArray) */
1218 mono_mb_emit_icon (mb, MONO_SIZEOF_MONO_ARRAY);
1219 mono_mb_emit_byte (mb, CEE_ADD_OVF_UN);
1220 mono_mb_emit_stloc (mb, size_var);
1222 pos_leave = mono_mb_emit_branch (mb, CEE_LEAVE);
1225 clause->flags = MONO_EXCEPTION_CLAUSE_NONE;
1226 clause->try_len = mono_mb_get_pos (mb) - clause->try_offset;
1227 clause->data.catch_class = mono_class_load_from_name (mono_defaults.corlib,
1228 "System", "OverflowException");
1229 clause->handler_offset = mono_mb_get_label (mb);
1231 oom_exc_class = mono_class_load_from_name (mono_defaults.corlib,
1232 "System", "OutOfMemoryException");
1233 ctor = mono_class_get_method_from_name (oom_exc_class, ".ctor", 0);
1236 mono_mb_emit_byte (mb, CEE_POP);
1237 mono_mb_emit_op (mb, CEE_NEWOBJ, ctor);
1238 mono_mb_emit_byte (mb, CEE_THROW);
1240 clause->handler_len = mono_mb_get_pos (mb) - clause->handler_offset;
1241 mono_mb_set_clauses (mb, 1, clause);
1242 mono_mb_patch_branch (mb, pos_leave);
1244 } else if (atype == ATYPE_STRING) {
1248 * a string allocator method takes the args: (vtable, len)
1250 * bytes = offsetof (MonoString, chars) + ((len + 1) * 2)
1254 * bytes <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1258 * offsetof (MonoString, chars) + ((len + 1) * 2) <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1259 * len <= (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - offsetof (MonoString, chars)) / 2 - 1
1261 mono_mb_emit_ldarg (mb, 1);
1262 mono_mb_emit_icon (mb, (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - MONO_STRUCT_OFFSET (MonoString, chars)) / 2 - 1);
1263 pos = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
1265 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1266 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1267 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1268 mono_mb_patch_short_branch (mb, pos);
1270 mono_mb_emit_ldarg (mb, 1);
1271 mono_mb_emit_icon (mb, 1);
1272 mono_mb_emit_byte (mb, MONO_CEE_SHL);
1273 //WE manually fold the above + 2 here
1274 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, chars) + 2);
1275 mono_mb_emit_byte (mb, CEE_ADD);
1276 mono_mb_emit_stloc (mb, size_var);
1278 g_assert_not_reached ();
1281 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1282 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1283 mono_mb_emit_byte (mb, CEE_LDC_I4_1);
1284 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1285 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1286 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_NONE);
1289 if (nursery_canaries_enabled ()) {
1290 real_size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1291 mono_mb_emit_ldloc (mb, size_var);
1292 mono_mb_emit_stloc(mb, real_size_var);
1295 real_size_var = size_var;
1297 /* size += ALLOC_ALIGN - 1; */
1298 mono_mb_emit_ldloc (mb, size_var);
1299 mono_mb_emit_icon (mb, SGEN_ALLOC_ALIGN - 1);
1300 mono_mb_emit_byte (mb, CEE_ADD);
1301 /* size &= ~(ALLOC_ALIGN - 1); */
1302 mono_mb_emit_icon (mb, ~(SGEN_ALLOC_ALIGN - 1));
1303 mono_mb_emit_byte (mb, CEE_AND);
1304 mono_mb_emit_stloc (mb, size_var);
1306 /* if (size > MAX_SMALL_OBJ_SIZE) goto slowpath */
1307 if (atype != ATYPE_SMALL) {
1308 mono_mb_emit_ldloc (mb, size_var);
1309 mono_mb_emit_icon (mb, SGEN_MAX_SMALL_OBJ_SIZE);
1310 max_size_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
1314 * We need to modify tlab_next, but the JIT only supports reading, so we read
1315 * another tls var holding its address instead.
1318 /* tlab_next_addr (local) = tlab_next_addr (TLS var) */
1319 tlab_next_addr_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1320 EMIT_TLS_ACCESS_NEXT_ADDR (mb, thread_var);
1321 mono_mb_emit_stloc (mb, tlab_next_addr_var);
1323 /* p = (void**)tlab_next; */
1324 p_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1325 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1326 mono_mb_emit_byte (mb, CEE_LDIND_I);
1327 mono_mb_emit_stloc (mb, p_var);
1329 /* new_next = (char*)p + size; */
1330 new_next_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1331 mono_mb_emit_ldloc (mb, p_var);
1332 mono_mb_emit_ldloc (mb, size_var);
1333 mono_mb_emit_byte (mb, CEE_CONV_I);
1334 mono_mb_emit_byte (mb, CEE_ADD);
1336 if (nursery_canaries_enabled ()) {
1337 mono_mb_emit_icon (mb, CANARY_SIZE);
1338 mono_mb_emit_byte (mb, CEE_ADD);
1340 mono_mb_emit_stloc (mb, new_next_var);
1342 /* if (G_LIKELY (new_next < tlab_temp_end)) */
1343 mono_mb_emit_ldloc (mb, new_next_var);
1344 EMIT_TLS_ACCESS_TEMP_END (mb, thread_var);
1345 fastpath_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
1348 if (atype != ATYPE_SMALL)
1349 mono_mb_patch_short_branch (mb, max_size_branch);
1351 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1352 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1354 * We are no longer in a critical section. We need to do this before calling
1355 * to unmanaged land in order to avoid stw deadlocks since unmanaged code
1358 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1359 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1360 mono_mb_emit_byte (mb, CEE_LDC_I4_0);
1361 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1362 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1363 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_NONE);
1366 /* FIXME: mono_gc_alloc_obj takes a 'size_t' as an argument, not an int32 */
1367 mono_mb_emit_ldarg (mb, 0);
1368 mono_mb_emit_ldloc (mb, real_size_var);
1369 if (atype == ATYPE_NORMAL || atype == ATYPE_SMALL) {
1370 mono_mb_emit_icall (mb, mono_gc_alloc_obj);
1371 } else if (atype == ATYPE_VECTOR) {
1372 mono_mb_emit_ldarg (mb, 1);
1373 mono_mb_emit_icall (mb, mono_gc_alloc_vector);
1374 } else if (atype == ATYPE_STRING) {
1375 mono_mb_emit_ldarg (mb, 1);
1376 mono_mb_emit_icall (mb, mono_gc_alloc_string);
1378 g_assert_not_reached ();
1381 /* if (ret == NULL) throw OOM; */
1382 mono_mb_emit_byte (mb, CEE_DUP);
1383 no_oom_branch = mono_mb_emit_branch (mb, CEE_BRTRUE);
1384 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1386 mono_mb_patch_branch (mb, no_oom_branch);
1387 mono_mb_emit_byte (mb, CEE_RET);
1390 mono_mb_patch_short_branch (mb, fastpath_branch);
1392 /* FIXME: Memory barrier */
1394 /* tlab_next = new_next */
1395 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1396 mono_mb_emit_ldloc (mb, new_next_var);
1397 mono_mb_emit_byte (mb, CEE_STIND_I);
1400 mono_mb_emit_ldloc (mb, p_var);
1401 mono_mb_emit_ldarg (mb, 0);
1402 mono_mb_emit_byte (mb, CEE_STIND_I);
1404 /* mark object end with nursery word */
1405 if (nursery_canaries_enabled ()) {
1406 mono_mb_emit_ldloc (mb, p_var);
1407 mono_mb_emit_ldloc (mb, real_size_var);
1408 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1409 mono_mb_emit_icon8 (mb, (mword) CANARY_STRING);
1410 mono_mb_emit_icon (mb, CANARY_SIZE);
1411 mono_mb_emit_byte (mb, MONO_CEE_PREFIX1);
1412 mono_mb_emit_byte (mb, CEE_CPBLK);
1415 if (atype == ATYPE_VECTOR) {
1416 /* arr->max_length = max_length; */
1417 mono_mb_emit_ldloc (mb, p_var);
1418 mono_mb_emit_ldflda (mb, MONO_STRUCT_OFFSET (MonoArray, max_length));
1419 mono_mb_emit_ldarg (mb, 1);
1420 #ifdef MONO_BIG_ARRAYS
1421 mono_mb_emit_byte (mb, CEE_STIND_I);
1423 mono_mb_emit_byte (mb, CEE_STIND_I4);
1425 } else if (atype == ATYPE_STRING) {
1426 /* need to set length and clear the last char */
1427 /* s->length = len; */
1428 mono_mb_emit_ldloc (mb, p_var);
1429 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, length));
1430 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1431 mono_mb_emit_ldarg (mb, 1);
1432 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
1435 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1436 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1437 mono_mb_emit_byte (mb, CEE_LDC_I4_0);
1438 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1439 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1441 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1442 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1445 We must make sure both vtable and max_length are globaly visible before returning to managed land.
1447 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1450 mono_mb_emit_ldloc (mb, p_var);
1453 mono_mb_emit_byte (mb, CEE_RET);
1456 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
1457 info->d.alloc.gc_name = "sgen";
1458 info->d.alloc.alloc_type = atype;
1461 mb->init_locals = FALSE;
1464 res = mono_mb_create (mb, csig, 8, info);
1473 mono_gc_get_aligned_size_for_allocator (int size)
1475 return SGEN_ALIGN_UP (size);
1479 * Generate an allocator method implementing the fast path of mono_gc_alloc_obj ().
1480 * The signature of the called method is:
1481 * object allocate (MonoVTable *vtable)
1484 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box, gboolean known_instance_size)
1486 #ifdef MANAGED_ALLOCATION
1487 if (collect_before_allocs)
1489 if (klass->instance_size > tlab_size)
1491 if (known_instance_size && ALIGN_TO (klass->instance_size, SGEN_ALLOC_ALIGN) >= SGEN_MAX_SMALL_OBJ_SIZE)
1493 if (mono_class_has_finalizer (klass) || mono_class_is_marshalbyref (klass))
1497 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1499 if (klass->byval_arg.type == MONO_TYPE_STRING)
1500 return mono_gc_get_managed_allocator_by_type (ATYPE_STRING, MANAGED_ALLOCATOR_REGULAR);
1501 /* Generic classes have dynamic field and can go above MAX_SMALL_OBJ_SIZE. */
1502 if (known_instance_size)
1503 return mono_gc_get_managed_allocator_by_type (ATYPE_SMALL, MANAGED_ALLOCATOR_REGULAR);
1505 return mono_gc_get_managed_allocator_by_type (ATYPE_NORMAL, MANAGED_ALLOCATOR_REGULAR);
1512 mono_gc_get_managed_array_allocator (MonoClass *klass)
1514 #ifdef MANAGED_ALLOCATION
1515 if (klass->rank != 1)
1517 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1519 if (has_per_allocation_action)
1521 g_assert (!mono_class_has_finalizer (klass) && !mono_class_is_marshalbyref (klass));
1523 return mono_gc_get_managed_allocator_by_type (ATYPE_VECTOR, MANAGED_ALLOCATOR_REGULAR);
1530 sgen_set_use_managed_allocator (gboolean flag)
1532 use_managed_allocator = flag;
1536 mono_gc_get_managed_allocator_by_type (int atype, ManagedAllocatorVariant variant)
1538 #ifdef MANAGED_ALLOCATION
1542 if (variant == MANAGED_ALLOCATOR_REGULAR && !use_managed_allocator)
1546 case MANAGED_ALLOCATOR_REGULAR: cache = alloc_method_cache; break;
1547 case MANAGED_ALLOCATOR_SLOW_PATH: cache = slowpath_alloc_method_cache; break;
1548 default: g_assert_not_reached (); break;
1551 res = cache [atype];
1555 res = create_allocator (atype, variant);
1557 if (cache [atype]) {
1558 mono_free_method (res);
1559 res = cache [atype];
1561 mono_memory_barrier ();
1562 cache [atype] = res;
1573 mono_gc_get_managed_allocator_types (void)
1579 sgen_is_managed_allocator (MonoMethod *method)
1583 for (i = 0; i < ATYPE_NUM; ++i)
1584 if (method == alloc_method_cache [i] || method == slowpath_alloc_method_cache [i])
1590 sgen_has_managed_allocator (void)
1594 for (i = 0; i < ATYPE_NUM; ++i)
1595 if (alloc_method_cache [i] || slowpath_alloc_method_cache [i])
1600 #define ARRAY_OBJ_INDEX(ptr,array,elem_size) (((char*)(ptr) - ((char*)(array) + G_STRUCT_OFFSET (MonoArray, vector))) / (elem_size))
1603 sgen_client_cardtable_scan_object (GCObject *obj, guint8 *cards, ScanCopyContext ctx)
1605 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
1606 MonoClass *klass = vt->klass;
1608 SGEN_ASSERT (0, SGEN_VTABLE_HAS_REFERENCES (vt), "Why would we ever call this on reference-free objects?");
1611 MonoArray *arr = (MonoArray*)obj;
1612 guint8 *card_data, *card_base;
1613 guint8 *card_data_end;
1614 char *obj_start = (char *)sgen_card_table_align_pointer (obj);
1616 mword obj_size = sgen_mono_array_size (vt, arr, &bounds_size, sgen_vtable_get_descriptor (vt));
1617 /* We don't want to scan the bounds entries at the end of multidimensional arrays */
1618 char *obj_end = (char*)obj + obj_size - bounds_size;
1620 size_t extra_idx = 0;
1622 mword desc = (mword)klass->element_class->gc_descr;
1623 int elem_size = mono_array_element_size (klass);
1625 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1626 guint8 *overflow_scan_end = NULL;
1629 #ifdef SGEN_OBJECT_LAYOUT_STATISTICS
1630 if (klass->element_class->valuetype)
1631 sgen_object_layout_scanned_vtype_array ();
1633 sgen_object_layout_scanned_ref_array ();
1639 card_data = sgen_card_table_get_card_scan_address ((mword)obj);
1641 card_base = card_data;
1642 card_count = sgen_card_table_number_of_cards_in_range ((mword)obj, obj_size);
1643 card_data_end = card_data + card_count;
1646 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1647 /*Check for overflow and if so, setup to scan in two steps*/
1648 if (!cards && card_data_end >= SGEN_SHADOW_CARDTABLE_END) {
1649 overflow_scan_end = sgen_shadow_cardtable + (card_data_end - SGEN_SHADOW_CARDTABLE_END);
1650 card_data_end = SGEN_SHADOW_CARDTABLE_END;
1656 card_data = sgen_find_next_card (card_data, card_data_end);
1657 for (; card_data < card_data_end; card_data = sgen_find_next_card (card_data + 1, card_data_end)) {
1659 size_t idx = (card_data - card_base) + extra_idx;
1660 char *start = (char*)(obj_start + idx * CARD_SIZE_IN_BYTES);
1661 char *card_end = start + CARD_SIZE_IN_BYTES;
1662 char *first_elem, *elem;
1664 HEAVY_STAT (++los_marked_cards);
1667 sgen_card_table_prepare_card_for_scanning (card_data);
1669 card_end = MIN (card_end, obj_end);
1671 if (start <= (char*)arr->vector)
1674 index = ARRAY_OBJ_INDEX (start, obj, elem_size);
1676 elem = first_elem = (char*)mono_array_addr_with_size_fast ((MonoArray*)obj, elem_size, index);
1677 if (klass->element_class->valuetype) {
1678 ScanVTypeFunc scan_vtype_func = ctx.ops->scan_vtype;
1680 for (; elem < card_end; elem += elem_size)
1681 scan_vtype_func (obj, elem, desc, ctx.queue BINARY_PROTOCOL_ARG (elem_size));
1683 ScanPtrFieldFunc scan_ptr_field_func = ctx.ops->scan_ptr_field;
1685 HEAVY_STAT (++los_array_cards);
1686 for (; elem < card_end; elem += SIZEOF_VOID_P)
1687 scan_ptr_field_func (obj, (GCObject**)elem, ctx.queue);
1690 binary_protocol_card_scan (first_elem, elem - first_elem);
1693 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1694 if (overflow_scan_end) {
1695 extra_idx = card_data - card_base;
1696 card_base = card_data = sgen_shadow_cardtable;
1697 card_data_end = overflow_scan_end;
1698 overflow_scan_end = NULL;
1709 * Array and string allocation
1713 mono_gc_alloc_vector (MonoVTable *vtable, size_t size, uintptr_t max_length)
1718 if (!SGEN_CAN_ALIGN_UP (size))
1721 #ifndef DISABLE_CRITICAL_REGION
1722 ENTER_CRITICAL_REGION;
1723 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1725 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1726 arr->max_length = (mono_array_size_t)max_length;
1727 EXIT_CRITICAL_REGION;
1730 EXIT_CRITICAL_REGION;
1735 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1736 if (G_UNLIKELY (!arr)) {
1741 arr->max_length = (mono_array_size_t)max_length;
1746 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1747 mono_profiler_allocation (&arr->obj);
1749 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Vector has incorrect size.");
1754 mono_gc_alloc_array (MonoVTable *vtable, size_t size, uintptr_t max_length, uintptr_t bounds_size)
1757 MonoArrayBounds *bounds;
1760 if (!SGEN_CAN_ALIGN_UP (size))
1763 #ifndef DISABLE_CRITICAL_REGION
1764 ENTER_CRITICAL_REGION;
1765 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1767 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1768 arr->max_length = (mono_array_size_t)max_length;
1770 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1771 arr->bounds = bounds;
1772 EXIT_CRITICAL_REGION;
1775 EXIT_CRITICAL_REGION;
1780 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1781 if (G_UNLIKELY (!arr)) {
1786 arr->max_length = (mono_array_size_t)max_length;
1788 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1789 arr->bounds = bounds;
1794 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1795 mono_profiler_allocation (&arr->obj);
1797 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Array has incorrect size.");
1802 mono_gc_alloc_string (MonoVTable *vtable, size_t size, gint32 len)
1807 if (!SGEN_CAN_ALIGN_UP (size))
1810 #ifndef DISABLE_CRITICAL_REGION
1811 ENTER_CRITICAL_REGION;
1812 str = (MonoString*)sgen_try_alloc_obj_nolock (vtable, size);
1814 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1816 EXIT_CRITICAL_REGION;
1819 EXIT_CRITICAL_REGION;
1824 str = (MonoString*)sgen_alloc_obj_nolock (vtable, size);
1825 if (G_UNLIKELY (!str)) {
1835 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1836 mono_profiler_allocation (&str->object);
1846 mono_gc_set_string_length (MonoString *str, gint32 new_length)
1848 mono_unichar2 *new_end = str->chars + new_length;
1850 /* zero the discarded string. This null-delimits the string and allows
1851 * the space to be reclaimed by SGen. */
1853 if (nursery_canaries_enabled () && sgen_ptr_in_nursery (str)) {
1854 CHECK_CANARY_FOR_OBJECT ((GCObject*)str, TRUE);
1855 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2) + CANARY_SIZE);
1856 memcpy (new_end + 1 , CANARY_STRING, CANARY_SIZE);
1858 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2));
1861 str->length = new_length;
1868 #define GC_ROOT_NUM 32
1870 int count; /* must be the first field */
1871 void *objects [GC_ROOT_NUM];
1872 int root_types [GC_ROOT_NUM];
1873 uintptr_t extra_info [GC_ROOT_NUM];
1877 notify_gc_roots (GCRootReport *report)
1881 mono_profiler_gc_roots (report->count, report->objects, report->root_types, report->extra_info);
1886 add_profile_gc_root (GCRootReport *report, void *object, int rtype, uintptr_t extra_info)
1888 if (report->count == GC_ROOT_NUM)
1889 notify_gc_roots (report);
1890 report->objects [report->count] = object;
1891 report->root_types [report->count] = rtype;
1892 report->extra_info [report->count++] = (uintptr_t)SGEN_LOAD_VTABLE (object)->klass;
1896 sgen_client_nursery_objects_pinned (void **definitely_pinned, int count)
1898 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS) {
1899 GCRootReport report;
1902 for (idx = 0; idx < count; ++idx)
1903 add_profile_gc_root (&report, definitely_pinned [idx], MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
1904 notify_gc_roots (&report);
1909 report_finalizer_roots_from_queue (SgenPointerQueue *queue)
1911 GCRootReport report;
1915 for (i = 0; i < queue->next_slot; ++i) {
1916 void *obj = queue->data [i];
1919 add_profile_gc_root (&report, obj, MONO_PROFILE_GC_ROOT_FINALIZER, 0);
1921 notify_gc_roots (&report);
1925 report_finalizer_roots (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
1927 report_finalizer_roots_from_queue (fin_ready_queue);
1928 report_finalizer_roots_from_queue (critical_fin_queue);
1931 static GCRootReport *root_report;
1934 single_arg_report_root (MonoObject **obj, void *gc_data)
1937 add_profile_gc_root (root_report, *obj, MONO_PROFILE_GC_ROOT_OTHER, 0);
1941 precisely_report_roots_from (GCRootReport *report, void** start_root, void** end_root, mword desc)
1943 switch (desc & ROOT_DESC_TYPE_MASK) {
1944 case ROOT_DESC_BITMAP:
1945 desc >>= ROOT_DESC_TYPE_SHIFT;
1947 if ((desc & 1) && *start_root) {
1948 add_profile_gc_root (report, *start_root, MONO_PROFILE_GC_ROOT_OTHER, 0);
1954 case ROOT_DESC_COMPLEX: {
1955 gsize *bitmap_data = (gsize *)sgen_get_complex_descriptor_bitmap (desc);
1956 gsize bwords = (*bitmap_data) - 1;
1957 void **start_run = start_root;
1959 while (bwords-- > 0) {
1960 gsize bmap = *bitmap_data++;
1961 void **objptr = start_run;
1963 if ((bmap & 1) && *objptr) {
1964 add_profile_gc_root (report, *objptr, MONO_PROFILE_GC_ROOT_OTHER, 0);
1969 start_run += GC_BITS_PER_WORD;
1973 case ROOT_DESC_VECTOR: {
1976 for (p = start_root; p < end_root; p++) {
1978 add_profile_gc_root (report, *p, MONO_PROFILE_GC_ROOT_OTHER, 0);
1982 case ROOT_DESC_USER: {
1983 MonoGCRootMarkFunc marker = (MonoGCRootMarkFunc)sgen_get_user_descriptor_func (desc);
1984 root_report = report;
1985 marker ((MonoObject**)start_root, single_arg_report_root, NULL);
1988 case ROOT_DESC_RUN_LEN:
1989 g_assert_not_reached ();
1991 g_assert_not_reached ();
1996 report_registered_roots_by_type (int root_type)
1998 GCRootReport report;
2002 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], void **, start_root, RootRecord *, root) {
2003 SGEN_LOG (6, "Precise root scan %p-%p (desc: %p)", start_root, root->end_root, (void*)root->root_desc);
2004 precisely_report_roots_from (&report, start_root, (void**)root->end_root, root->root_desc);
2005 } SGEN_HASH_TABLE_FOREACH_END;
2006 notify_gc_roots (&report);
2010 report_registered_roots (void)
2012 report_registered_roots_by_type (ROOT_TYPE_NORMAL);
2013 report_registered_roots_by_type (ROOT_TYPE_WBARRIER);
2017 sgen_client_collecting_minor (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2019 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2020 report_registered_roots ();
2021 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2022 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2025 static GCRootReport major_root_report;
2026 static gboolean profile_roots;
2029 sgen_client_collecting_major_1 (void)
2031 profile_roots = mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS;
2032 memset (&major_root_report, 0, sizeof (GCRootReport));
2036 sgen_client_pinned_los_object (GCObject *obj)
2039 add_profile_gc_root (&major_root_report, (char*)obj, MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
2043 sgen_client_collecting_major_2 (void)
2046 notify_gc_roots (&major_root_report);
2048 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2049 report_registered_roots ();
2053 sgen_client_collecting_major_3 (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2055 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2056 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2059 #define MOVED_OBJECTS_NUM 64
2060 static void *moved_objects [MOVED_OBJECTS_NUM];
2061 static int moved_objects_idx = 0;
2063 static SgenPointerQueue moved_objects_queue = SGEN_POINTER_QUEUE_INIT (INTERNAL_MEM_MOVED_OBJECT);
2066 mono_sgen_register_moved_object (void *obj, void *destination)
2069 * This function can be called from SGen's worker threads. We want to try
2070 * and avoid exposing those threads to the profiler API, so queue up move
2071 * events and send them later when the main GC thread calls
2072 * mono_sgen_gc_event_moves ().
2074 * TODO: Once SGen has multiple worker threads, we need to switch to a
2075 * lock-free data structure for the queue as multiple threads will be
2076 * adding to it at the same time.
2078 if (sgen_workers_is_worker_thread (mono_native_thread_id_get ())) {
2079 sgen_pointer_queue_add (&moved_objects_queue, obj);
2080 sgen_pointer_queue_add (&moved_objects_queue, destination);
2082 if (moved_objects_idx == MOVED_OBJECTS_NUM) {
2083 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2084 moved_objects_idx = 0;
2087 moved_objects [moved_objects_idx++] = obj;
2088 moved_objects [moved_objects_idx++] = destination;
2093 mono_sgen_gc_event_moves (void)
2095 while (!sgen_pointer_queue_is_empty (&moved_objects_queue)) {
2096 void *dst = sgen_pointer_queue_pop (&moved_objects_queue);
2097 void *src = sgen_pointer_queue_pop (&moved_objects_queue);
2099 mono_sgen_register_moved_object (src, dst);
2102 if (moved_objects_idx) {
2103 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2104 moved_objects_idx = 0;
2112 #define REFS_SIZE 128
2115 MonoGCReferences callback;
2119 MonoObject *refs [REFS_SIZE];
2120 uintptr_t offsets [REFS_SIZE];
2124 #define HANDLE_PTR(ptr,obj) do { \
2126 if (hwi->count == REFS_SIZE) { \
2127 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data); \
2131 hwi->offsets [hwi->count] = (char*)(ptr)-(char*)start; \
2132 hwi->refs [hwi->count++] = *(ptr); \
2137 collect_references (HeapWalkInfo *hwi, GCObject *obj, size_t size)
2139 char *start = (char*)obj;
2140 mword desc = sgen_obj_get_descriptor (obj);
2142 #include "sgen/sgen-scan-object.h"
2146 walk_references (GCObject *start, size_t size, void *data)
2148 HeapWalkInfo *hwi = (HeapWalkInfo *)data;
2151 collect_references (hwi, start, size);
2152 if (hwi->count || !hwi->called)
2153 hwi->callback (start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data);
2157 * mono_gc_walk_heap:
2158 * \param flags flags for future use
2159 * \param callback a function pointer called for each object in the heap
2160 * \param data a user data pointer that is passed to callback
2161 * This function can be used to iterate over all the live objects in the heap;
2162 * for each object, \p callback is invoked, providing info about the object's
2163 * location in memory, its class, its size and the objects it references.
2164 * For each referenced object its offset from the object address is
2165 * reported in the offsets array.
2166 * The object references may be buffered, so the callback may be invoked
2167 * multiple times for the same object: in all but the first call, the size
2168 * argument will be zero.
2169 * Note that this function can be only called in the \c MONO_GC_EVENT_PRE_START_WORLD
2170 * profiler event handler.
2171 * \returns a non-zero value if the GC doesn't support heap walking
2174 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
2179 hwi.callback = callback;
2182 sgen_clear_nursery_fragments ();
2183 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data, walk_references, &hwi, FALSE, TRUE);
2185 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, walk_references, &hwi);
2186 sgen_los_iterate_objects (walk_references, &hwi);
2196 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
2198 gc_callbacks = *callbacks;
2202 mono_gc_get_gc_callbacks ()
2204 return &gc_callbacks;
2208 sgen_client_thread_register (SgenThreadInfo* info, void *stack_bottom_fallback)
2211 guint8 *staddr = NULL;
2213 mono_tls_set_sgen_thread_info (info);
2215 info->client_info.skip = 0;
2217 info->client_info.stack_start = NULL;
2219 #ifdef SGEN_POSIX_STW
2220 info->client_info.stop_count = -1;
2221 info->client_info.signal = 0;
2224 mono_thread_info_get_stack_bounds (&staddr, &stsize);
2226 info->client_info.stack_start_limit = staddr;
2227 info->client_info.stack_end = staddr + stsize;
2229 gsize stack_bottom = (gsize)stack_bottom_fallback;
2230 stack_bottom += 4095;
2231 stack_bottom &= ~4095;
2232 info->client_info.stack_end = (char*)stack_bottom;
2235 memset (&info->client_info.ctx, 0, sizeof (MonoContext));
2237 if (mono_gc_get_gc_callbacks ()->thread_attach_func)
2238 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2240 binary_protocol_thread_register ((gpointer)mono_thread_info_get_tid (info));
2242 SGEN_LOG (3, "registered thread %p (%p) stack end %p", info, (gpointer)mono_thread_info_get_tid (info), info->client_info.stack_end);
2244 info->client_info.info.handle_stack = mono_handle_stack_alloc ();
2248 sgen_client_thread_unregister (SgenThreadInfo *p)
2250 MonoNativeThreadId tid;
2252 mono_tls_set_sgen_thread_info (NULL);
2254 tid = mono_thread_info_get_tid (p);
2256 if (p->client_info.info.runtime_thread)
2257 mono_threads_add_joinable_thread ((gpointer)tid);
2259 if (mono_gc_get_gc_callbacks ()->thread_detach_func) {
2260 mono_gc_get_gc_callbacks ()->thread_detach_func (p->client_info.runtime_data);
2261 p->client_info.runtime_data = NULL;
2264 binary_protocol_thread_unregister ((gpointer)tid);
2265 SGEN_LOG (3, "unregister thread %p (%p)", p, (gpointer)tid);
2267 HandleStack *handles = (HandleStack*) p->client_info.info.handle_stack;
2268 p->client_info.info.handle_stack = NULL;
2269 mono_handle_stack_free (handles);
2273 mono_gc_set_skip_thread (gboolean skip)
2275 SgenThreadInfo *info = mono_thread_info_current ();
2278 info->client_info.gc_disabled = skip;
2282 /* If we skip scanning a thread with a non-empty handle stack, we may move an
2283 * object but fail to update the reference in the handle.
2285 HandleStack *stack = info->client_info.info.handle_stack;
2286 g_assert (stack == NULL || mono_handle_stack_is_empty (stack));
2291 thread_in_critical_region (SgenThreadInfo *info)
2293 return info->client_info.in_critical_region;
2297 sgen_thread_attach (SgenThreadInfo *info)
2299 if (mono_gc_get_gc_callbacks ()->thread_attach_func && !info->client_info.runtime_data)
2300 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2304 sgen_thread_detach (SgenThreadInfo *p)
2306 /* If a delegate is passed to native code and invoked on a thread we dont
2307 * know about, marshal will register it with mono_threads_attach_coop, but
2308 * we have no way of knowing when that thread goes away. SGen has a TSD
2309 * so we assume that if the domain is still registered, we can detach
2312 if (mono_thread_internal_current_is_attached ())
2313 mono_thread_detach_internal (mono_thread_internal_current ());
2317 * mono_gc_register_thread:
2320 mono_gc_register_thread (void *baseptr)
2322 return mono_thread_info_attach (baseptr) != NULL;
2326 * mono_gc_is_gc_thread:
2329 mono_gc_is_gc_thread (void)
2333 result = mono_thread_info_current () != NULL;
2339 sgen_client_thread_register_worker (void)
2341 mono_thread_info_register_small_id ();
2342 mono_native_thread_set_name (mono_native_thread_id_get (), "SGen worker");
2345 /* Variables holding start/end nursery so it won't have to be passed at every call */
2346 static void *scan_area_arg_start, *scan_area_arg_end;
2349 mono_gc_conservatively_scan_area (void *start, void *end)
2351 sgen_conservatively_pin_objects_from ((void **)start, (void **)end, scan_area_arg_start, scan_area_arg_end, PIN_TYPE_STACK);
2355 mono_gc_scan_object (void *obj, void *gc_data)
2357 ScanCopyContext *ctx = (ScanCopyContext *)gc_data;
2358 ctx->ops->copy_or_mark_object ((GCObject**)&obj, ctx->queue);
2363 void **start_nursery;
2365 } PinHandleStackInteriorPtrData;
2367 /* Called when we're scanning the handle stack imprecisely and we encounter a pointer into the
2368 middle of an object.
2371 pin_handle_stack_interior_ptrs (void **ptr_slot, void *user_data)
2373 PinHandleStackInteriorPtrData *ud = (PinHandleStackInteriorPtrData *)user_data;
2374 sgen_conservatively_pin_objects_from (ptr_slot, ptr_slot+1, ud->start_nursery, ud->end_nursery, PIN_TYPE_STACK);
2379 * Mark from thread stacks and registers.
2382 sgen_client_scan_thread_data (void *start_nursery, void *end_nursery, gboolean precise, ScanCopyContext ctx)
2384 scan_area_arg_start = start_nursery;
2385 scan_area_arg_end = end_nursery;
2387 FOREACH_THREAD (info) {
2388 int skip_reason = 0;
2389 void *aligned_stack_start;
2391 if (info->client_info.skip) {
2392 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);
2394 } else if (info->client_info.gc_disabled) {
2395 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);
2397 } else if (!mono_thread_info_is_live (info)) {
2398 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);
2400 } else if (!info->client_info.stack_start) {
2401 SGEN_LOG (3, "Skipping starting or detaching thread %p", info);
2405 binary_protocol_scan_stack ((gpointer)mono_thread_info_get_tid (info), info->client_info.stack_start, info->client_info.stack_end, skip_reason);
2409 /* If we skip a thread with a non-empty handle stack and then it
2410 * resumes running we may potentially move an object but fail to
2411 * update the reference in the handle.
2413 HandleStack *stack = info->client_info.info.handle_stack;
2414 g_assert (stack == NULL || mono_handle_stack_is_empty (stack));
2419 g_assert (info->client_info.stack_start);
2420 g_assert (info->client_info.stack_end);
2422 aligned_stack_start = (void*)(mword) ALIGN_TO ((mword)info->client_info.stack_start, SIZEOF_VOID_P);
2424 /* Windows uses a guard page before the committed stack memory pages to detect when the
2425 stack needs to be grown. If we suspend a thread just after a function prolog has
2426 decremented the stack pointer to point into the guard page but before the thread has
2427 been able to read or write to that page, starting the stack scan at aligned_stack_start
2428 will raise a STATUS_GUARD_PAGE_VIOLATION and the process will crash. This code uses
2429 VirtualQuery() to determine whether stack_start points into the guard page and then
2430 updates aligned_stack_start to point at the next non-guard page. */
2431 MEMORY_BASIC_INFORMATION mem_info;
2432 SIZE_T result = VirtualQuery(info->client_info.stack_start, &mem_info, sizeof(mem_info));
2433 g_assert (result != 0);
2434 if (mem_info.Protect & PAGE_GUARD) {
2435 aligned_stack_start = ((char*) mem_info.BaseAddress) + mem_info.RegionSize;
2439 g_assert (info->client_info.suspend_done);
2440 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 ());
2441 if (mono_gc_get_gc_callbacks ()->thread_mark_func && !conservative_stack_mark) {
2442 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);
2443 } else if (!precise) {
2444 if (!conservative_stack_mark) {
2445 fprintf (stderr, "Precise stack mark not supported - disabling.\n");
2446 conservative_stack_mark = TRUE;
2448 //FIXME we should eventually use the new stack_mark from coop
2449 sgen_conservatively_pin_objects_from ((void **)aligned_stack_start, (void **)info->client_info.stack_end, start_nursery, end_nursery, PIN_TYPE_STACK);
2453 sgen_conservatively_pin_objects_from ((void**)&info->client_info.ctx, (void**)(&info->client_info.ctx + 1),
2454 start_nursery, end_nursery, PIN_TYPE_STACK);
2457 // This is used on Coop GC for platforms where we cannot get the data for individual registers.
2458 // We force a spill of all registers into the stack and pass a chunk of data into sgen.
2459 //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
2460 MonoThreadUnwindState *state = &info->client_info.info.thread_saved_state [SELF_SUSPEND_STATE_INDEX];
2461 if (state && state->gc_stackdata) {
2462 sgen_conservatively_pin_objects_from ((void **)state->gc_stackdata, (void**)((char*)state->gc_stackdata + state->gc_stackdata_size),
2463 start_nursery, end_nursery, PIN_TYPE_STACK);
2467 if (info->client_info.info.handle_stack) {
2469 Make two passes over the handle stack. On the imprecise pass, pin all
2470 objects where the handle points into the interior of the object. On the
2471 precise pass, copy or mark all the objects that have handles to the
2472 beginning of the object.
2475 mono_handle_stack_scan ((HandleStack*)info->client_info.info.handle_stack, (GcScanFunc)ctx.ops->copy_or_mark_object, ctx.queue, precise);
2477 PinHandleStackInteriorPtrData ud = { .start_nursery = start_nursery,
2478 .end_nursery = end_nursery,
2480 mono_handle_stack_scan ((HandleStack*)info->client_info.info.handle_stack, pin_handle_stack_interior_ptrs, &ud, precise);
2483 } FOREACH_THREAD_END
2487 * mono_gc_set_stack_end:
2489 * Set the end of the current threads stack to STACK_END. The stack space between
2490 * STACK_END and the real end of the threads stack will not be scanned during collections.
2493 mono_gc_set_stack_end (void *stack_end)
2495 SgenThreadInfo *info;
2498 info = mono_thread_info_current ();
2500 SGEN_ASSERT (0, stack_end < info->client_info.stack_end, "Can only lower stack end");
2501 info->client_info.stack_end = stack_end;
2511 mono_gc_register_root (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2513 return sgen_register_root (start, size, descr, descr ? ROOT_TYPE_NORMAL : ROOT_TYPE_PINNED, source, msg);
2517 mono_gc_register_root_wbarrier (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2519 return sgen_register_root (start, size, descr, ROOT_TYPE_WBARRIER, source, msg);
2523 mono_gc_deregister_root (char* addr)
2525 sgen_deregister_root (addr);
2534 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
2538 mono_threads_join_lock ();
2539 res = pthread_create (new_thread, attr, start_routine, arg);
2540 mono_threads_join_unlock ();
2551 sgen_client_total_allocated_heap_changed (size_t allocated_heap)
2553 mono_runtime_resource_check_limit (MONO_RESOURCE_GC_HEAP, allocated_heap);
2557 mono_gc_user_markers_supported (void)
2563 mono_object_is_alive (MonoObject* o)
2569 mono_gc_get_generation (MonoObject *obj)
2571 if (sgen_ptr_in_nursery (obj))
2577 mono_gc_get_gc_name (void)
2583 mono_gc_get_description (void)
2585 #ifdef HAVE_CONC_GC_AS_DEFAULT
2586 return g_strdup ("sgen (concurrent by default)");
2588 return g_strdup ("sgen");
2593 mono_gc_set_desktop_mode (void)
2598 mono_gc_is_moving (void)
2604 mono_gc_is_disabled (void)
2610 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
2617 mono_gc_max_generation (void)
2623 mono_gc_precise_stack_mark_enabled (void)
2625 return !conservative_stack_mark;
2629 mono_gc_collect (int generation)
2631 sgen_gc_collect (generation);
2635 mono_gc_collection_count (int generation)
2637 return sgen_gc_collection_count (generation);
2641 mono_gc_get_used_size (void)
2643 return (int64_t)sgen_gc_get_used_size ();
2647 mono_gc_get_heap_size (void)
2649 return (int64_t)sgen_gc_get_total_heap_allocation ();
2653 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
2655 return sgen_make_user_root_descriptor (marker);
2659 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
2661 return SGEN_DESC_STRING;
2665 mono_gc_get_nursery (int *shift_bits, size_t *size)
2667 *size = sgen_nursery_size;
2668 *shift_bits = DEFAULT_NURSERY_BITS;
2669 return sgen_get_nursery_start ();
2673 mono_gc_get_los_limit (void)
2675 return SGEN_MAX_SMALL_OBJ_SIZE;
2679 sgen_client_default_metadata (void)
2681 return mono_domain_get ();
2685 sgen_client_metadata_for_object (GCObject *obj)
2687 return mono_object_domain (obj);
2691 * mono_gchandle_is_in_domain:
2692 * \param gchandle a GCHandle's handle.
2693 * \param domain An application domain.
2694 * \returns TRUE if the object wrapped by the \p gchandle belongs to the specific \p domain.
2697 mono_gchandle_is_in_domain (guint32 gchandle, MonoDomain *domain)
2699 MonoDomain *gchandle_domain = (MonoDomain *)sgen_gchandle_get_metadata (gchandle);
2700 return domain->domain_id == gchandle_domain->domain_id;
2704 * mono_gchandle_free_domain:
2705 * \param unloading domain that is unloading
2707 * Function used internally to cleanup any GC handle for objects belonging
2708 * to the specified domain during appdomain unload.
2711 mono_gchandle_free_domain (MonoDomain *unloading)
2716 null_link_if_in_domain (gpointer hidden, GCHandleType handle_type, int max_generation, gpointer user)
2718 MonoDomain *unloading_domain = (MonoDomain *)user;
2719 MonoDomain *obj_domain;
2720 gboolean is_weak = MONO_GC_HANDLE_TYPE_IS_WEAK (handle_type);
2721 if (MONO_GC_HANDLE_IS_OBJECT_POINTER (hidden)) {
2722 MonoObject *obj = (MonoObject *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2723 obj_domain = mono_object_domain (obj);
2725 obj_domain = (MonoDomain *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2727 if (unloading_domain->domain_id == obj_domain->domain_id)
2733 sgen_null_links_for_domain (MonoDomain *domain)
2736 for (type = HANDLE_TYPE_MIN; type < HANDLE_TYPE_MAX; ++type)
2737 sgen_gchandle_iterate ((GCHandleType)type, GENERATION_OLD, null_link_if_in_domain, domain);
2741 mono_gchandle_set_target (guint32 gchandle, MonoObject *obj)
2743 sgen_gchandle_set_target (gchandle, obj);
2747 sgen_client_gchandle_created (int handle_type, GCObject *obj, guint32 handle)
2749 #ifndef DISABLE_PERFCOUNTERS
2750 mono_perfcounters->gc_num_handles++;
2752 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_CREATED, handle_type, handle, obj);
2756 sgen_client_gchandle_destroyed (int handle_type, guint32 handle)
2758 #ifndef DISABLE_PERFCOUNTERS
2759 mono_perfcounters->gc_num_handles--;
2761 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_DESTROYED, handle_type, handle, NULL);
2765 sgen_client_ensure_weak_gchandles_accessible (void)
2768 * During the second bridge processing step the world is
2769 * running again. That step processes all weak links once
2770 * more to null those that refer to dead objects. Before that
2771 * is completed, those links must not be followed, so we
2772 * conservatively wait for bridge processing when any weak
2773 * link is dereferenced.
2775 /* FIXME: A GC can occur after this check fails, in which case we
2776 * should wait for bridge processing but would fail to do so.
2778 if (G_UNLIKELY (bridge_processing_in_progress))
2779 mono_gc_wait_for_bridge_processing ();
2783 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
2787 result = func (data);
2788 UNLOCK_INTERRUPTION;
2793 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
2799 mono_gc_get_card_table (int *shift_bits, gpointer *mask)
2801 return sgen_get_card_table_configuration (shift_bits, mask);
2805 mono_gc_card_table_nursery_check (void)
2807 return !sgen_get_major_collector ()->is_concurrent;
2810 /* Negative value to remove */
2812 mono_gc_add_memory_pressure (gint64 value)
2814 /* FIXME: Implement at some point? */
2822 sgen_client_degraded_allocation (size_t size)
2824 static int last_major_gc_warned = -1;
2825 static int num_degraded = 0;
2827 if (last_major_gc_warned < (int)gc_stats.major_gc_count) {
2829 if (num_degraded == 1 || num_degraded == 3)
2830 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Degraded allocation. Consider increasing nursery-size if the warning persists.");
2831 else if (num_degraded == 10)
2832 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Repeated degraded allocation. Consider increasing nursery-size.");
2833 last_major_gc_warned = gc_stats.major_gc_count;
2842 sgen_client_description_for_internal_mem_type (int type)
2845 case INTERNAL_MEM_EPHEMERON_LINK: return "ephemeron-link";
2846 case INTERNAL_MEM_MOVED_OBJECT: return "moved-object";
2853 sgen_client_pre_collection_checks (void)
2855 if (sgen_mono_xdomain_checks) {
2856 sgen_clear_nursery_fragments ();
2857 sgen_check_for_xdomain_refs ();
2862 sgen_client_vtable_is_inited (MonoVTable *vt)
2864 return vt->klass->inited;
2868 sgen_client_vtable_get_namespace (MonoVTable *vt)
2870 return vt->klass->name_space;
2874 sgen_client_vtable_get_name (MonoVTable *vt)
2876 return vt->klass->name;
2884 sgen_client_init (void)
2887 MonoThreadInfoCallbacks cb;
2889 cb.thread_register = sgen_thread_register;
2890 cb.thread_detach = sgen_thread_detach;
2891 cb.thread_unregister = sgen_thread_unregister;
2892 cb.thread_attach = sgen_thread_attach;
2893 cb.mono_thread_in_critical_region = thread_in_critical_region;
2894 cb.ip_in_critical_region = ip_in_critical_region;
2896 mono_threads_init (&cb, sizeof (SgenThreadInfo));
2898 ///* Keep this the default for now */
2899 /* Precise marking is broken on all supported targets. Disable until fixed. */
2900 conservative_stack_mark = TRUE;
2902 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_EPHEMERON_LINK, sizeof (EphemeronLinkNode));
2904 mono_sgen_init_stw ();
2906 mono_tls_init_gc_keys ();
2908 mono_gc_register_thread (&dummy);
2912 sgen_client_handle_gc_param (const char *opt)
2914 if (g_str_has_prefix (opt, "stack-mark=")) {
2915 opt = strchr (opt, '=') + 1;
2916 if (!strcmp (opt, "precise")) {
2917 conservative_stack_mark = FALSE;
2918 } else if (!strcmp (opt, "conservative")) {
2919 conservative_stack_mark = TRUE;
2921 sgen_env_var_error (MONO_GC_PARAMS_NAME, conservative_stack_mark ? "Using `conservative`." : "Using `precise`.",
2922 "Invalid value `%s` for `stack-mark` option, possible values are: `precise`, `conservative`.", opt);
2924 } else if (g_str_has_prefix (opt, "bridge-implementation=")) {
2925 opt = strchr (opt, '=') + 1;
2926 sgen_set_bridge_implementation (opt);
2927 } else if (g_str_has_prefix (opt, "toggleref-test")) {
2928 /* FIXME: This should probably in MONO_GC_DEBUG */
2929 sgen_register_test_toggleref_callback ();
2930 } else if (!sgen_bridge_handle_gc_param (opt)) {
2937 sgen_client_print_gc_params_usage (void)
2939 fprintf (stderr, " stack-mark=MARK-METHOD (where MARK-METHOD is 'precise' or 'conservative')\n");
2943 sgen_client_handle_gc_debug (const char *opt)
2945 if (!strcmp (opt, "xdomain-checks")) {
2946 sgen_mono_xdomain_checks = TRUE;
2947 } else if (!strcmp (opt, "do-not-finalize")) {
2948 mono_do_not_finalize = TRUE;
2949 } else if (g_str_has_prefix (opt, "do-not-finalize=")) {
2950 opt = strchr (opt, '=') + 1;
2951 mono_do_not_finalize = TRUE;
2952 mono_do_not_finalize_class_names = g_strsplit (opt, ",", 0);
2953 } else if (!strcmp (opt, "log-finalizers")) {
2954 log_finalizers = TRUE;
2955 } else if (!strcmp (opt, "no-managed-allocator")) {
2956 sgen_set_use_managed_allocator (FALSE);
2957 } else if (!sgen_bridge_handle_gc_debug (opt)) {
2964 sgen_client_print_gc_debug_usage (void)
2966 fprintf (stderr, " xdomain-checks\n");
2967 fprintf (stderr, " do-not-finalize\n");
2968 fprintf (stderr, " log-finalizers\n");
2969 fprintf (stderr, " no-managed-allocator\n");
2970 sgen_bridge_print_gc_debug_usage ();
2975 sgen_client_get_provenance (void)
2977 #ifdef SGEN_OBJECT_PROVENANCE
2978 MonoGCCallbacks *cb = mono_gc_get_gc_callbacks ();
2979 gpointer (*get_provenance_func) (void);
2982 get_provenance_func = cb->get_provenance_func;
2983 if (get_provenance_func)
2984 return get_provenance_func ();
2992 sgen_client_describe_invalid_pointer (GCObject *ptr)
2994 sgen_bridge_describe_pointer (ptr);
2997 static gboolean gc_inited;
3000 * mono_gc_base_init:
3003 mono_gc_base_init (void)
3008 mono_counters_init ();
3011 mono_w32handle_init ();
3014 #ifdef HEAVY_STATISTICS
3015 mono_counters_register ("los marked cards", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_marked_cards);
3016 mono_counters_register ("los array cards scanned ", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_cards);
3017 mono_counters_register ("los array remsets", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_remsets);
3019 mono_counters_register ("WBarrier set arrayref", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_set_arrayref);
3020 mono_counters_register ("WBarrier value copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_value_copy);
3021 mono_counters_register ("WBarrier object copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_object_copy);
3030 mono_gc_base_cleanup (void)
3032 sgen_thread_pool_shutdown (major_collector.get_sweep_pool ());
3034 sgen_workers_shutdown ();
3036 // We should have consumed any outstanding moves.
3037 g_assert (sgen_pointer_queue_is_empty (&moved_objects_queue));
3041 mono_gc_is_null (void)