2 * sgen-mono.c: SGen features specific to Mono.
4 * Copyright (C) 2014 Xamarin Inc
6 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
12 #include "sgen/sgen-gc.h"
13 #include "sgen/sgen-protocol.h"
14 #include "metadata/monitor.h"
15 #include "sgen/sgen-layout-stats.h"
16 #include "sgen/sgen-client.h"
17 #include "sgen/sgen-cardtable.h"
18 #include "sgen/sgen-pinning.h"
19 #include "sgen/sgen-thread-pool.h"
20 #include "metadata/marshal.h"
21 #include "metadata/method-builder.h"
22 #include "metadata/abi-details.h"
23 #include "metadata/mono-gc.h"
24 #include "metadata/runtime.h"
25 #include "metadata/sgen-bridge-internals.h"
26 #include "metadata/gc-internals.h"
27 #include "metadata/handle.h"
28 #include "utils/mono-memory-model.h"
29 #include "utils/mono-logger-internals.h"
30 #include "utils/mono-threads-coop.h"
31 #include "sgen/sgen-thread-pool.h"
32 #include "utils/mono-threads.h"
34 #ifdef HEAVY_STATISTICS
35 static guint64 stat_wbarrier_set_arrayref = 0;
36 static guint64 stat_wbarrier_value_copy = 0;
37 static guint64 stat_wbarrier_object_copy = 0;
39 static guint64 los_marked_cards;
40 static guint64 los_array_cards;
41 static guint64 los_array_remsets;
44 /* If set, mark stacks conservatively, even if precise marking is possible */
45 static gboolean conservative_stack_mark = FALSE;
46 /* If set, check that there are no references to the domain left at domain unload */
47 gboolean sgen_mono_xdomain_checks = FALSE;
49 /* Functions supplied by the runtime to be called by the GC */
50 static MonoGCCallbacks gc_callbacks;
53 __thread SgenThreadInfo *sgen_thread_info;
55 MonoNativeTlsKey thread_info_key;
58 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
60 #define OPDEF(a,b,c,d,e,f,g,h,i,j) \
64 #include "mono/cil/opcode.def"
75 ptr_on_stack (void *ptr)
77 gpointer stack_start = &stack_start;
78 SgenThreadInfo *info = mono_thread_info_current ();
80 if (ptr >= stack_start && ptr < (gpointer)info->client_info.stack_end)
85 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
87 #define HANDLE_PTR(ptr,obj) do { \
88 gpointer o = *(gpointer*)(ptr); \
90 gpointer d = ((char*)dest) + ((char*)(ptr) - (char*)(obj)); \
91 binary_protocol_wbarrier (d, o, (gpointer) SGEN_LOAD_VTABLE (o)); \
96 scan_object_for_binary_protocol_copy_wbarrier (gpointer dest, char *start, mword desc)
98 #define SCAN_OBJECT_NOVTABLE
99 #include "sgen/sgen-scan-object.h"
104 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
106 HEAVY_STAT (++stat_wbarrier_value_copy);
107 g_assert (klass->valuetype);
109 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);
111 if (sgen_ptr_in_nursery (dest) || ptr_on_stack (dest) || !sgen_gc_descr_has_references ((mword)klass->gc_descr)) {
112 size_t element_size = mono_class_value_size (klass, NULL);
113 size_t size = count * element_size;
114 mono_gc_memmove_atomic (dest, src, size);
118 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
119 if (binary_protocol_is_heavy_enabled ()) {
120 size_t element_size = mono_class_value_size (klass, NULL);
122 for (i = 0; i < count; ++i) {
123 scan_object_for_binary_protocol_copy_wbarrier ((char*)dest + i * element_size,
124 (char*)src + i * element_size - sizeof (MonoObject),
125 (mword) klass->gc_descr);
130 sgen_get_remset ()->wbarrier_value_copy (dest, src, count, mono_class_value_size (klass, NULL));
134 * mono_gc_wbarrier_object_copy:
136 * Write barrier to call when obj is the result of a clone or copy of an object.
139 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
143 HEAVY_STAT (++stat_wbarrier_object_copy);
145 SGEN_ASSERT (6, !ptr_on_stack (obj), "Why is this called for a non-reference type?");
146 if (sgen_ptr_in_nursery (obj) || !SGEN_OBJECT_HAS_REFERENCES (src)) {
147 size = mono_object_class (obj)->instance_size;
148 mono_gc_memmove_aligned ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
149 size - sizeof (MonoObject));
153 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
154 if (binary_protocol_is_heavy_enabled ())
155 scan_object_for_binary_protocol_copy_wbarrier (obj, (char*)src, (mword) src->vtable->gc_descr);
158 sgen_get_remset ()->wbarrier_object_copy (obj, src);
162 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
164 HEAVY_STAT (++stat_wbarrier_set_arrayref);
165 if (sgen_ptr_in_nursery (slot_ptr)) {
166 *(void**)slot_ptr = value;
169 SGEN_LOG (8, "Adding remset at %p", slot_ptr);
171 binary_protocol_wbarrier (slot_ptr, value, value->vtable);
173 sgen_get_remset ()->wbarrier_set_field ((GCObject*)arr, slot_ptr, value);
177 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
179 mono_gc_wbarrier_set_arrayref ((MonoArray*)obj, field_ptr, value);
183 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
185 sgen_wbarrier_value_copy_bitmap (_dest, _src, size, bitmap);
189 mono_gc_get_suspend_signal (void)
191 return mono_threads_suspend_get_suspend_signal ();
195 mono_gc_get_restart_signal (void)
197 return mono_threads_suspend_get_restart_signal ();
200 static MonoMethod *write_barrier_conc_method;
201 static MonoMethod *write_barrier_noconc_method;
204 sgen_is_critical_method (MonoMethod *method)
206 return sgen_is_managed_allocator (method);
210 sgen_has_critical_method (void)
212 return sgen_has_managed_allocator ();
216 ip_in_critical_region (MonoDomain *domain, gpointer ip)
222 * We pass false for 'try_aot' so this becomes async safe.
223 * It won't find aot methods whose jit info is not yet loaded,
224 * so we preload their jit info in the JIT.
226 ji = mono_jit_info_table_find_internal (domain, ip, FALSE, FALSE);
230 method = mono_jit_info_get_method (ji);
232 return mono_runtime_is_critical_method (method) || sgen_is_critical_method (method);
236 mono_gc_is_critical_method (MonoMethod *method)
238 return sgen_is_critical_method (method);
244 emit_nursery_check (MonoMethodBuilder *mb, int *nursery_check_return_labels, gboolean is_concurrent)
246 int shifted_nursery_start = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
248 memset (nursery_check_return_labels, 0, sizeof (int) * 2);
249 // if (ptr_in_nursery (ptr)) return;
251 * Masking out the bits might be faster, but we would have to use 64 bit
252 * immediates, which might be slower.
254 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
255 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_START);
256 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
257 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
258 mono_mb_emit_byte (mb, CEE_SHR_UN);
259 mono_mb_emit_stloc (mb, shifted_nursery_start);
261 mono_mb_emit_ldarg (mb, 0);
262 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
263 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
264 mono_mb_emit_byte (mb, CEE_SHR_UN);
265 mono_mb_emit_ldloc (mb, shifted_nursery_start);
266 nursery_check_return_labels [0] = mono_mb_emit_branch (mb, CEE_BEQ);
268 if (!is_concurrent) {
269 // if (!ptr_in_nursery (*ptr)) return;
270 mono_mb_emit_ldarg (mb, 0);
271 mono_mb_emit_byte (mb, CEE_LDIND_I);
272 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
273 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
274 mono_mb_emit_byte (mb, CEE_SHR_UN);
275 mono_mb_emit_ldloc (mb, shifted_nursery_start);
276 nursery_check_return_labels [1] = mono_mb_emit_branch (mb, CEE_BNE_UN);
282 mono_gc_get_specific_write_barrier (gboolean is_concurrent)
285 MonoMethodBuilder *mb;
286 MonoMethodSignature *sig;
287 MonoMethod **write_barrier_method_addr;
289 #ifdef MANAGED_WBARRIER
290 int i, nursery_check_labels [2];
293 // FIXME: Maybe create a separate version for ctors (the branch would be
294 // correctly predicted more times)
296 write_barrier_method_addr = &write_barrier_conc_method;
298 write_barrier_method_addr = &write_barrier_noconc_method;
300 if (*write_barrier_method_addr)
301 return *write_barrier_method_addr;
303 /* Create the IL version of mono_gc_barrier_generic_store () */
304 sig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
305 sig->ret = &mono_defaults.void_class->byval_arg;
306 sig->params [0] = &mono_defaults.int_class->byval_arg;
309 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_conc", MONO_WRAPPER_WRITE_BARRIER);
311 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_noconc", MONO_WRAPPER_WRITE_BARRIER);
314 #ifdef MANAGED_WBARRIER
315 emit_nursery_check (mb, nursery_check_labels, is_concurrent);
317 addr = sgen_cardtable + ((address >> CARD_BITS) & CARD_MASK)
321 LDC_PTR sgen_cardtable
327 if (SGEN_HAVE_OVERLAPPING_CARDS) {
328 LDC_PTR card_table_mask
335 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
336 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_CARD_TABLE);
337 mono_mb_emit_ldarg (mb, 0);
338 mono_mb_emit_icon (mb, CARD_BITS);
339 mono_mb_emit_byte (mb, CEE_SHR_UN);
340 mono_mb_emit_byte (mb, CEE_CONV_I);
341 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
342 #if SIZEOF_VOID_P == 8
343 mono_mb_emit_icon8 (mb, CARD_MASK);
345 mono_mb_emit_icon (mb, CARD_MASK);
347 mono_mb_emit_byte (mb, CEE_CONV_I);
348 mono_mb_emit_byte (mb, CEE_AND);
350 mono_mb_emit_byte (mb, CEE_ADD);
351 mono_mb_emit_icon (mb, 1);
352 mono_mb_emit_byte (mb, CEE_STIND_I1);
355 for (i = 0; i < 2; ++i) {
356 if (nursery_check_labels [i])
357 mono_mb_patch_branch (mb, nursery_check_labels [i]);
359 mono_mb_emit_byte (mb, CEE_RET);
361 mono_mb_emit_ldarg (mb, 0);
362 mono_mb_emit_icall (mb, mono_gc_wbarrier_generic_nostore);
363 mono_mb_emit_byte (mb, CEE_RET);
366 res = mono_mb_create_method (mb, sig, 16);
367 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
368 mono_marshal_set_wrapper_info (res, info);
372 if (*write_barrier_method_addr) {
373 /* Already created */
374 mono_free_method (res);
376 /* double-checked locking */
377 mono_memory_barrier ();
378 *write_barrier_method_addr = res;
382 return *write_barrier_method_addr;
386 mono_gc_get_write_barrier (void)
388 return mono_gc_get_specific_write_barrier (major_collector.is_concurrent);
392 * Dummy filler objects
395 /* Vtable of the objects used to fill out nursery fragments before a collection */
396 static GCVTable array_fill_vtable;
399 get_array_fill_vtable (void)
401 if (!array_fill_vtable) {
402 static MonoClass klass;
403 static char _vtable[sizeof(MonoVTable)+8];
404 MonoVTable* vtable = (MonoVTable*) ALIGN_TO((mword)_vtable, 8);
407 MonoDomain *domain = mono_get_root_domain ();
410 klass.element_class = mono_defaults.byte_class;
412 klass.instance_size = MONO_SIZEOF_MONO_ARRAY;
413 klass.sizes.element_size = 1;
414 klass.name = "array_filler_type";
416 vtable->klass = &klass;
418 vtable->gc_descr = mono_gc_make_descr_for_array (TRUE, &bmap, 0, 1);
421 array_fill_vtable = vtable;
423 return array_fill_vtable;
427 sgen_client_array_fill_range (char *start, size_t size)
431 if (size < MONO_SIZEOF_MONO_ARRAY) {
432 memset (start, 0, size);
436 o = (MonoArray*)start;
437 o->obj.vtable = (MonoVTable*)get_array_fill_vtable ();
438 /* Mark this as not a real object */
439 o->obj.synchronisation = (MonoThreadsSync *)GINT_TO_POINTER (-1);
441 o->max_length = (mono_array_size_t)(size - MONO_SIZEOF_MONO_ARRAY);
447 sgen_client_zero_array_fill_header (void *p, size_t size)
449 if (size >= MONO_SIZEOF_MONO_ARRAY) {
450 memset (p, 0, MONO_SIZEOF_MONO_ARRAY);
452 static guint8 zeros [MONO_SIZEOF_MONO_ARRAY];
454 SGEN_ASSERT (0, !memcmp (p, zeros, size), "TLAB segment must be zeroed out.");
462 static MonoGCFinalizerCallbacks fin_callbacks;
465 mono_gc_get_vtable_bits (MonoClass *klass)
468 /* FIXME move this to the bridge code */
469 if (sgen_need_bridge_processing ()) {
470 switch (sgen_bridge_class_kind (klass)) {
471 case GC_BRIDGE_TRANSPARENT_BRIDGE_CLASS:
472 case GC_BRIDGE_OPAQUE_BRIDGE_CLASS:
473 res = SGEN_GC_BIT_BRIDGE_OBJECT;
475 case GC_BRIDGE_OPAQUE_CLASS:
476 res = SGEN_GC_BIT_BRIDGE_OPAQUE_OBJECT;
478 case GC_BRIDGE_TRANSPARENT_CLASS:
482 if (fin_callbacks.is_class_finalization_aware) {
483 if (fin_callbacks.is_class_finalization_aware (klass))
484 res |= SGEN_GC_BIT_FINALIZER_AWARE;
490 is_finalization_aware (MonoObject *obj)
492 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
493 return (vt->gc_bits & SGEN_GC_BIT_FINALIZER_AWARE) == SGEN_GC_BIT_FINALIZER_AWARE;
497 sgen_client_object_queued_for_finalization (GCObject *obj)
499 if (fin_callbacks.object_queued_for_finalization && is_finalization_aware (obj))
500 fin_callbacks.object_queued_for_finalization (obj);
503 if (G_UNLIKELY (MONO_GC_FINALIZE_ENQUEUE_ENABLED ())) {
504 int gen = sgen_ptr_in_nursery (obj) ? GENERATION_NURSERY : GENERATION_OLD;
505 GCVTable vt = SGEN_LOAD_VTABLE (obj);
506 MONO_GC_FINALIZE_ENQUEUE ((mword)obj, sgen_safe_object_get_size (obj),
507 sgen_client_vtable_get_namespace (vt), sgen_client_vtable_get_name (vt), gen,
508 sgen_client_object_has_critical_finalizer (obj));
514 mono_gc_register_finalizer_callbacks (MonoGCFinalizerCallbacks *callbacks)
516 if (callbacks->version != MONO_GC_FINALIZER_EXTENSION_VERSION)
517 g_error ("Invalid finalizer callback version. Expected %d but got %d\n", MONO_GC_FINALIZER_EXTENSION_VERSION, callbacks->version);
519 fin_callbacks = *callbacks;
523 sgen_client_run_finalize (MonoObject *obj)
525 mono_gc_run_finalize (obj, NULL);
529 mono_gc_invoke_finalizers (void)
531 return sgen_gc_invoke_finalizers ();
535 mono_gc_pending_finalizers (void)
537 return sgen_have_pending_finalizers ();
541 sgen_client_finalize_notify (void)
543 mono_gc_finalize_notify ();
547 mono_gc_register_for_finalization (MonoObject *obj, void *user_data)
549 sgen_object_register_for_finalization (obj, user_data);
553 object_in_domain_predicate (MonoObject *obj, void *user_data)
555 MonoDomain *domain = (MonoDomain *)user_data;
556 if (mono_object_domain (obj) == domain) {
557 SGEN_LOG (5, "Unregistering finalizer for object: %p (%s)", obj, sgen_client_vtable_get_name (SGEN_LOAD_VTABLE (obj)));
564 * mono_gc_finalizers_for_domain:
565 * @domain: the unloading appdomain
566 * @out_array: output array
567 * @out_size: size of output array
569 * Enqueue for finalization all objects that belong to the unloading appdomain @domain
570 * @suspend is used for early termination of the enqueuing process.
573 mono_gc_finalize_domain (MonoDomain *domain)
575 sgen_finalize_if (object_in_domain_predicate, domain);
579 mono_gc_suspend_finalizers (void)
581 sgen_set_suspend_finalizers ();
588 typedef struct _EphemeronLinkNode EphemeronLinkNode;
590 struct _EphemeronLinkNode {
591 EphemeronLinkNode *next;
600 static EphemeronLinkNode *ephemeron_list;
602 /* LOCKING: requires that the GC lock is held */
604 null_ephemerons_for_domain (MonoDomain *domain)
606 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
609 MonoObject *object = (MonoObject*)current->array;
612 SGEN_ASSERT (0, object->vtable, "Can't have objects without vtables.");
614 if (object && object->vtable->domain == domain) {
615 EphemeronLinkNode *tmp = current;
618 prev->next = current->next;
620 ephemeron_list = current->next;
622 current = current->next;
623 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
626 current = current->next;
631 /* LOCKING: requires that the GC lock is held */
633 sgen_client_clear_unreachable_ephemerons (ScanCopyContext ctx)
635 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
636 SgenGrayQueue *queue = ctx.queue;
637 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
638 Ephemeron *cur, *array_end;
642 MonoArray *array = current->array;
644 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
645 EphemeronLinkNode *tmp = current;
647 SGEN_LOG (5, "Dead Ephemeron array at %p", array);
650 prev->next = current->next;
652 ephemeron_list = current->next;
654 current = current->next;
655 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
660 copy_func ((GCObject**)&array, queue);
661 current->array = array;
663 SGEN_LOG (5, "Clearing unreachable entries for ephemeron array at %p", array);
665 cur = mono_array_addr (array, Ephemeron, 0);
666 array_end = cur + mono_array_length_fast (array);
667 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
669 for (; cur < array_end; ++cur) {
670 GCObject *key = cur->key;
672 if (!key || key == tombstone)
675 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
676 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
677 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
679 if (!sgen_is_object_alive_for_current_gen (key)) {
680 cur->key = tombstone;
686 current = current->next;
691 LOCKING: requires that the GC lock is held
693 Limitations: We scan all ephemerons on every collection since the current design doesn't allow for a simple nursery/mature split.
696 sgen_client_mark_ephemerons (ScanCopyContext ctx)
698 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
699 SgenGrayQueue *queue = ctx.queue;
700 gboolean nothing_marked = TRUE;
701 EphemeronLinkNode *current = ephemeron_list;
702 Ephemeron *cur, *array_end;
705 for (current = ephemeron_list; current; current = current->next) {
706 MonoArray *array = current->array;
707 SGEN_LOG (5, "Ephemeron array at %p", array);
709 /*It has to be alive*/
710 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
711 SGEN_LOG (5, "\tnot reachable");
715 copy_func ((GCObject**)&array, queue);
717 cur = mono_array_addr (array, Ephemeron, 0);
718 array_end = cur + mono_array_length_fast (array);
719 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
721 for (; cur < array_end; ++cur) {
722 GCObject *key = cur->key;
724 if (!key || key == tombstone)
727 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
728 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
729 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
731 if (sgen_is_object_alive_for_current_gen (key)) {
732 GCObject *value = cur->value;
734 copy_func (&cur->key, queue);
736 if (!sgen_is_object_alive_for_current_gen (value))
737 nothing_marked = FALSE;
738 copy_func (&cur->value, queue);
744 SGEN_LOG (5, "Ephemeron run finished. Is it done %d", nothing_marked);
745 return nothing_marked;
749 mono_gc_ephemeron_array_add (MonoObject *obj)
751 EphemeronLinkNode *node;
755 node = (EphemeronLinkNode *)sgen_alloc_internal (INTERNAL_MEM_EPHEMERON_LINK);
760 node->array = (MonoArray*)obj;
761 node->next = ephemeron_list;
762 ephemeron_list = node;
764 SGEN_LOG (5, "Registered ephemeron array %p", obj);
775 need_remove_object_for_domain (GCObject *start, MonoDomain *domain)
777 if (mono_object_domain (start) == domain) {
778 SGEN_LOG (4, "Need to cleanup object %p", start);
779 binary_protocol_cleanup (start, (gpointer)SGEN_LOAD_VTABLE (start), sgen_safe_object_get_size ((GCObject*)start));
786 process_object_for_domain_clearing (GCObject *start, MonoDomain *domain)
788 MonoVTable *vt = SGEN_LOAD_VTABLE (start);
789 if (vt->klass == mono_defaults.internal_thread_class)
790 g_assert (mono_object_domain (start) == mono_get_root_domain ());
791 /* The object could be a proxy for an object in the domain
793 #ifndef DISABLE_REMOTING
794 if (mono_defaults.real_proxy_class->supertypes && mono_class_has_parent_fast (vt->klass, mono_defaults.real_proxy_class)) {
795 MonoObject *server = ((MonoRealProxy*)start)->unwrapped_server;
797 /* The server could already have been zeroed out, so
798 we need to check for that, too. */
799 if (server && (!SGEN_LOAD_VTABLE (server) || mono_object_domain (server) == domain)) {
800 SGEN_LOG (4, "Cleaning up remote pointer in %p to object %p", start, server);
801 ((MonoRealProxy*)start)->unwrapped_server = NULL;
808 clear_domain_process_object (GCObject *obj, MonoDomain *domain)
812 process_object_for_domain_clearing (obj, domain);
813 remove = need_remove_object_for_domain (obj, domain);
815 if (remove && obj->synchronisation) {
816 guint32 dislink = mono_monitor_get_object_monitor_gchandle (obj);
818 mono_gchandle_free (dislink);
825 clear_domain_process_minor_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
827 if (clear_domain_process_object (obj, domain)) {
828 CANARIFY_SIZE (size);
829 memset (obj, 0, size);
834 clear_domain_process_major_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
836 clear_domain_process_object (obj, domain);
840 clear_domain_free_major_non_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
842 if (need_remove_object_for_domain (obj, domain))
843 major_collector.free_non_pinned_object (obj, size);
847 clear_domain_free_major_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
849 if (need_remove_object_for_domain (obj, domain))
850 major_collector.free_pinned_object (obj, size);
854 * When appdomains are unloaded we can easily remove objects that have finalizers,
855 * but all the others could still be present in random places on the heap.
856 * We need a sweep to get rid of them even though it's going to be costly
858 * The reason we need to remove them is because we access the vtable and class
859 * structures to know the object size and the reference bitmap: once the domain is
860 * unloaded the point to random memory.
863 mono_gc_clear_domain (MonoDomain * domain)
865 LOSObject *bigobj, *prev;
870 binary_protocol_domain_unload_begin (domain);
874 if (sgen_concurrent_collection_in_progress ())
875 sgen_perform_collection (0, GENERATION_OLD, "clear domain", TRUE, FALSE);
876 SGEN_ASSERT (0, !sgen_concurrent_collection_in_progress (), "We just ordered a synchronous collection. Why are we collecting concurrently?");
878 major_collector.finish_sweeping ();
880 sgen_process_fin_stage_entries ();
882 sgen_clear_nursery_fragments ();
884 if (sgen_mono_xdomain_checks && domain != mono_get_root_domain ()) {
885 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_NORMAL);
886 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_WBARRIER);
887 sgen_check_for_xdomain_refs ();
890 /*Ephemerons and dislinks must be processed before LOS since they might end up pointing
891 to memory returned to the OS.*/
892 null_ephemerons_for_domain (domain);
893 sgen_null_links_for_domain (domain);
895 for (i = GENERATION_NURSERY; i < GENERATION_MAX; ++i)
896 sgen_remove_finalizers_if (object_in_domain_predicate, domain, i);
898 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
899 (IterateObjectCallbackFunc)clear_domain_process_minor_object_callback, domain, FALSE, TRUE);
901 /* We need two passes over major and large objects because
902 freeing such objects might give their memory back to the OS
903 (in the case of large objects) or obliterate its vtable
904 (pinned objects with major-copying or pinned and non-pinned
905 objects with major-mark&sweep), but we might need to
906 dereference a pointer from an object to another object if
907 the first object is a proxy. */
908 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, (IterateObjectCallbackFunc)clear_domain_process_major_object_callback, domain);
909 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
910 clear_domain_process_object ((GCObject*)bigobj->data, domain);
913 for (bigobj = los_object_list; bigobj;) {
914 if (need_remove_object_for_domain ((GCObject*)bigobj->data, domain)) {
915 LOSObject *to_free = bigobj;
917 prev->next = bigobj->next;
919 los_object_list = bigobj->next;
920 bigobj = bigobj->next;
921 SGEN_LOG (4, "Freeing large object %p", bigobj->data);
922 sgen_los_free_object (to_free);
926 bigobj = bigobj->next;
928 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_NON_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_non_pinned_object_callback, domain);
929 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_pinned_object_callback, domain);
931 if (domain == mono_get_root_domain ()) {
932 sgen_pin_stats_report ();
933 sgen_object_layout_dump (stdout);
936 sgen_restart_world (0);
938 binary_protocol_domain_unload_end (domain);
939 binary_protocol_flush_buffers (FALSE);
949 mono_gc_alloc_obj (MonoVTable *vtable, size_t size)
951 MonoObject *obj = sgen_alloc_obj (vtable, size);
953 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
955 mono_profiler_allocation (obj);
962 mono_gc_alloc_pinned_obj (MonoVTable *vtable, size_t size)
964 MonoObject *obj = sgen_alloc_obj_pinned (vtable, size);
966 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
968 mono_profiler_allocation (obj);
975 mono_gc_alloc_mature (MonoVTable *vtable, size_t size)
977 MonoObject *obj = sgen_alloc_obj_mature (vtable, size);
979 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
981 mono_profiler_allocation (obj);
988 mono_gc_alloc_fixed (size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
990 /* FIXME: do a single allocation */
991 void *res = g_calloc (1, size);
994 if (!mono_gc_register_root ((char *)res, size, descr, source, msg)) {
1002 mono_gc_free_fixed (void* addr)
1004 mono_gc_deregister_root ((char *)addr);
1012 static MonoMethod* alloc_method_cache [ATYPE_NUM];
1013 static MonoMethod* slowpath_alloc_method_cache [ATYPE_NUM];
1014 static gboolean use_managed_allocator = TRUE;
1016 #ifdef MANAGED_ALLOCATION
1018 #if defined(HAVE_KW_THREAD) || defined(TARGET_OSX) || defined(TARGET_WIN32) || defined(TARGET_ANDROID) || defined(TARGET_IOS)
1020 // Cache the SgenThreadInfo pointer in a local 'var'.
1021 #define EMIT_TLS_ACCESS_VAR(mb, var) \
1023 var = mono_mb_add_local ((mb), &mono_defaults.int_class->byval_arg); \
1024 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1025 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1026 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1027 mono_mb_emit_stloc ((mb), (var)); \
1030 #define EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR(mb, var) \
1032 mono_mb_emit_ldloc ((mb), (var)); \
1033 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenClientThreadInfo, in_critical_region)); \
1034 mono_mb_emit_byte ((mb), CEE_ADD); \
1037 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb, var) do { \
1038 mono_mb_emit_ldloc ((mb), (var)); \
1039 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_next)); \
1040 mono_mb_emit_byte ((mb), CEE_ADD); \
1043 #define EMIT_TLS_ACCESS_TEMP_END(mb, var) do { \
1044 mono_mb_emit_ldloc ((mb), (var)); \
1045 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_temp_end)); \
1046 mono_mb_emit_byte ((mb), CEE_ADD); \
1047 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1051 #define EMIT_TLS_ACCESS_VAR(mb, _var) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1052 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb, _var) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1053 #define EMIT_TLS_ACCESS_TEMP_END(mb, _var) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1054 #define EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR(mb, _var) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1058 /* FIXME: Do this in the JIT, where specialized allocation sequences can be created
1059 * for each class. This is currently not easy to do, as it is hard to generate basic
1060 * blocks + branches, but it is easy with the linear IL codebase.
1062 * For this to work we'd need to solve the TLAB race, first. Now we
1063 * require the allocator to be in a few known methods to make sure
1064 * that they are executed atomically via the restart mechanism.
1067 create_allocator (int atype, ManagedAllocatorVariant variant)
1069 int p_var, size_var, thread_var G_GNUC_UNUSED;
1070 gboolean slowpath = variant == MANAGED_ALLOCATOR_SLOW_PATH;
1071 guint32 slowpath_branch, max_size_branch;
1072 MonoMethodBuilder *mb;
1074 MonoMethodSignature *csig;
1075 static gboolean registered = FALSE;
1076 int tlab_next_addr_var, new_next_var;
1077 const char *name = NULL;
1082 mono_register_jit_icall (mono_gc_alloc_obj, "mono_gc_alloc_obj", mono_create_icall_signature ("object ptr int"), FALSE);
1083 mono_register_jit_icall (mono_gc_alloc_vector, "mono_gc_alloc_vector", mono_create_icall_signature ("object ptr int int"), FALSE);
1084 mono_register_jit_icall (mono_gc_alloc_string, "mono_gc_alloc_string", mono_create_icall_signature ("object ptr int int32"), FALSE);
1088 if (atype == ATYPE_SMALL) {
1089 name = slowpath ? "SlowAllocSmall" : "AllocSmall";
1090 } else if (atype == ATYPE_NORMAL) {
1091 name = slowpath ? "SlowAlloc" : "Alloc";
1092 } else if (atype == ATYPE_VECTOR) {
1093 name = slowpath ? "SlowAllocVector" : "AllocVector";
1094 } else if (atype == ATYPE_STRING) {
1095 name = slowpath ? "SlowAllocString" : "AllocString";
1097 g_assert_not_reached ();
1100 if (atype == ATYPE_NORMAL)
1105 csig = mono_metadata_signature_alloc (mono_defaults.corlib, num_params);
1106 if (atype == ATYPE_STRING) {
1107 csig->ret = &mono_defaults.string_class->byval_arg;
1108 csig->params [0] = &mono_defaults.int_class->byval_arg;
1109 csig->params [1] = &mono_defaults.int32_class->byval_arg;
1111 csig->ret = &mono_defaults.object_class->byval_arg;
1112 for (i = 0; i < num_params; i++)
1113 csig->params [i] = &mono_defaults.int_class->byval_arg;
1116 mb = mono_mb_new (mono_defaults.object_class, name, MONO_WRAPPER_ALLOC);
1123 mono_mb_emit_ldarg (mb, 0);
1124 mono_mb_emit_icall (mb, ves_icall_object_new_specific);
1127 mono_mb_emit_ldarg (mb, 0);
1128 mono_mb_emit_ldarg (mb, 1);
1129 mono_mb_emit_icall (mb, ves_icall_array_new_specific);
1132 mono_mb_emit_ldarg (mb, 1);
1133 mono_mb_emit_icall (mb, ves_icall_string_alloc);
1136 g_assert_not_reached ();
1143 * Tls access might call foreign code or code without jinfo. This can
1144 * only happen if we are outside of the critical region.
1146 EMIT_TLS_ACCESS_VAR (mb, thread_var);
1148 size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1149 if (atype == ATYPE_SMALL) {
1150 /* size_var = size_arg */
1151 mono_mb_emit_ldarg (mb, 1);
1152 mono_mb_emit_stloc (mb, size_var);
1153 } else if (atype == ATYPE_NORMAL) {
1154 /* size = vtable->klass->instance_size; */
1155 mono_mb_emit_ldarg (mb, 0);
1156 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1157 mono_mb_emit_byte (mb, CEE_ADD);
1158 mono_mb_emit_byte (mb, CEE_LDIND_I);
1159 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, instance_size));
1160 mono_mb_emit_byte (mb, CEE_ADD);
1161 /* FIXME: assert instance_size stays a 4 byte integer */
1162 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1163 mono_mb_emit_byte (mb, CEE_CONV_I);
1164 mono_mb_emit_stloc (mb, size_var);
1165 } else if (atype == ATYPE_VECTOR) {
1166 MonoExceptionClause *clause;
1167 int pos, pos_leave, pos_error;
1168 MonoClass *oom_exc_class;
1172 * n > MONO_ARRAY_MAX_INDEX => OutOfMemoryException
1173 * n < 0 => OverflowException
1175 * We can do an unsigned comparison to catch both cases, then in the error
1176 * case compare signed to distinguish between them.
1178 mono_mb_emit_ldarg (mb, 1);
1179 mono_mb_emit_icon (mb, MONO_ARRAY_MAX_INDEX);
1180 mono_mb_emit_byte (mb, CEE_CONV_U);
1181 pos = mono_mb_emit_short_branch (mb, CEE_BLE_UN_S);
1183 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1184 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1185 mono_mb_emit_ldarg (mb, 1);
1186 mono_mb_emit_icon (mb, 0);
1187 pos_error = mono_mb_emit_short_branch (mb, CEE_BLT_S);
1188 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1189 mono_mb_patch_short_branch (mb, pos_error);
1190 mono_mb_emit_exception (mb, "OverflowException", NULL);
1192 mono_mb_patch_short_branch (mb, pos);
1194 clause = (MonoExceptionClause *)mono_image_alloc0 (mono_defaults.corlib, sizeof (MonoExceptionClause));
1195 clause->try_offset = mono_mb_get_label (mb);
1197 /* vtable->klass->sizes.element_size */
1198 mono_mb_emit_ldarg (mb, 0);
1199 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1200 mono_mb_emit_byte (mb, CEE_ADD);
1201 mono_mb_emit_byte (mb, CEE_LDIND_I);
1202 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, sizes));
1203 mono_mb_emit_byte (mb, CEE_ADD);
1204 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1205 mono_mb_emit_byte (mb, CEE_CONV_I);
1208 mono_mb_emit_ldarg (mb, 1);
1209 mono_mb_emit_byte (mb, CEE_MUL_OVF_UN);
1210 /* + sizeof (MonoArray) */
1211 mono_mb_emit_icon (mb, MONO_SIZEOF_MONO_ARRAY);
1212 mono_mb_emit_byte (mb, CEE_ADD_OVF_UN);
1213 mono_mb_emit_stloc (mb, size_var);
1215 pos_leave = mono_mb_emit_branch (mb, CEE_LEAVE);
1218 clause->flags = MONO_EXCEPTION_CLAUSE_NONE;
1219 clause->try_len = mono_mb_get_pos (mb) - clause->try_offset;
1220 clause->data.catch_class = mono_class_load_from_name (mono_defaults.corlib,
1221 "System", "OverflowException");
1222 clause->handler_offset = mono_mb_get_label (mb);
1224 oom_exc_class = mono_class_load_from_name (mono_defaults.corlib,
1225 "System", "OutOfMemoryException");
1226 ctor = mono_class_get_method_from_name (oom_exc_class, ".ctor", 0);
1229 mono_mb_emit_byte (mb, CEE_POP);
1230 mono_mb_emit_op (mb, CEE_NEWOBJ, ctor);
1231 mono_mb_emit_byte (mb, CEE_THROW);
1233 clause->handler_len = mono_mb_get_pos (mb) - clause->handler_offset;
1234 mono_mb_set_clauses (mb, 1, clause);
1235 mono_mb_patch_branch (mb, pos_leave);
1237 } else if (atype == ATYPE_STRING) {
1241 * a string allocator method takes the args: (vtable, len)
1243 * bytes = offsetof (MonoString, chars) + ((len + 1) * 2)
1247 * bytes <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1251 * offsetof (MonoString, chars) + ((len + 1) * 2) <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1252 * len <= (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - offsetof (MonoString, chars)) / 2 - 1
1254 mono_mb_emit_ldarg (mb, 1);
1255 mono_mb_emit_icon (mb, (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - MONO_STRUCT_OFFSET (MonoString, chars)) / 2 - 1);
1256 pos = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
1258 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1259 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1260 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1261 mono_mb_patch_short_branch (mb, pos);
1263 mono_mb_emit_ldarg (mb, 1);
1264 mono_mb_emit_icon (mb, 1);
1265 mono_mb_emit_byte (mb, MONO_CEE_SHL);
1266 //WE manually fold the above + 2 here
1267 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, chars) + 2);
1268 mono_mb_emit_byte (mb, CEE_ADD);
1269 mono_mb_emit_stloc (mb, size_var);
1271 g_assert_not_reached ();
1274 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1275 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1276 mono_mb_emit_byte (mb, CEE_LDC_I4_1);
1277 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1278 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1279 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_NONE);
1282 /* size += ALLOC_ALIGN - 1; */
1283 mono_mb_emit_ldloc (mb, size_var);
1284 mono_mb_emit_icon (mb, SGEN_ALLOC_ALIGN - 1);
1285 mono_mb_emit_byte (mb, CEE_ADD);
1286 /* size &= ~(ALLOC_ALIGN - 1); */
1287 mono_mb_emit_icon (mb, ~(SGEN_ALLOC_ALIGN - 1));
1288 mono_mb_emit_byte (mb, CEE_AND);
1289 mono_mb_emit_stloc (mb, size_var);
1291 /* if (size > MAX_SMALL_OBJ_SIZE) goto slowpath */
1292 if (atype != ATYPE_SMALL) {
1293 mono_mb_emit_ldloc (mb, size_var);
1294 mono_mb_emit_icon (mb, SGEN_MAX_SMALL_OBJ_SIZE);
1295 max_size_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
1299 * We need to modify tlab_next, but the JIT only supports reading, so we read
1300 * another tls var holding its address instead.
1303 /* tlab_next_addr (local) = tlab_next_addr (TLS var) */
1304 tlab_next_addr_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1305 EMIT_TLS_ACCESS_NEXT_ADDR (mb, thread_var);
1306 mono_mb_emit_stloc (mb, tlab_next_addr_var);
1308 /* p = (void**)tlab_next; */
1309 p_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1310 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1311 mono_mb_emit_byte (mb, CEE_LDIND_I);
1312 mono_mb_emit_stloc (mb, p_var);
1314 /* new_next = (char*)p + size; */
1315 new_next_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1316 mono_mb_emit_ldloc (mb, p_var);
1317 mono_mb_emit_ldloc (mb, size_var);
1318 mono_mb_emit_byte (mb, CEE_CONV_I);
1319 mono_mb_emit_byte (mb, CEE_ADD);
1320 mono_mb_emit_stloc (mb, new_next_var);
1322 /* if (G_LIKELY (new_next < tlab_temp_end)) */
1323 mono_mb_emit_ldloc (mb, new_next_var);
1324 EMIT_TLS_ACCESS_TEMP_END (mb, thread_var);
1325 slowpath_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
1328 if (atype != ATYPE_SMALL)
1329 mono_mb_patch_short_branch (mb, max_size_branch);
1331 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1332 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1334 * We are no longer in a critical section. We need to do this before calling
1335 * to unmanaged land in order to avoid stw deadlocks since unmanaged code
1338 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1339 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1340 mono_mb_emit_byte (mb, CEE_LDC_I4_0);
1341 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1342 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1343 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_NONE);
1346 /* FIXME: mono_gc_alloc_obj takes a 'size_t' as an argument, not an int32 */
1347 mono_mb_emit_ldarg (mb, 0);
1348 mono_mb_emit_ldloc (mb, size_var);
1349 if (atype == ATYPE_NORMAL || atype == ATYPE_SMALL) {
1350 mono_mb_emit_icall (mb, mono_gc_alloc_obj);
1351 } else if (atype == ATYPE_VECTOR) {
1352 mono_mb_emit_ldarg (mb, 1);
1353 mono_mb_emit_icall (mb, mono_gc_alloc_vector);
1354 } else if (atype == ATYPE_STRING) {
1355 mono_mb_emit_ldarg (mb, 1);
1356 mono_mb_emit_icall (mb, mono_gc_alloc_string);
1358 g_assert_not_reached ();
1360 mono_mb_emit_byte (mb, CEE_RET);
1363 mono_mb_patch_short_branch (mb, slowpath_branch);
1365 /* FIXME: Memory barrier */
1367 /* tlab_next = new_next */
1368 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1369 mono_mb_emit_ldloc (mb, new_next_var);
1370 mono_mb_emit_byte (mb, CEE_STIND_I);
1373 mono_mb_emit_ldloc (mb, p_var);
1374 mono_mb_emit_ldarg (mb, 0);
1375 mono_mb_emit_byte (mb, CEE_STIND_I);
1377 if (atype == ATYPE_VECTOR) {
1378 /* arr->max_length = max_length; */
1379 mono_mb_emit_ldloc (mb, p_var);
1380 mono_mb_emit_ldflda (mb, MONO_STRUCT_OFFSET (MonoArray, max_length));
1381 mono_mb_emit_ldarg (mb, 1);
1382 #ifdef MONO_BIG_ARRAYS
1383 mono_mb_emit_byte (mb, CEE_STIND_I);
1385 mono_mb_emit_byte (mb, CEE_STIND_I4);
1387 } else if (atype == ATYPE_STRING) {
1388 /* need to set length and clear the last char */
1389 /* s->length = len; */
1390 mono_mb_emit_ldloc (mb, p_var);
1391 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, length));
1392 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1393 mono_mb_emit_ldarg (mb, 1);
1394 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
1397 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1398 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1399 mono_mb_emit_byte (mb, CEE_LDC_I4_0);
1400 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1401 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1403 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1404 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1407 We must make sure both vtable and max_length are globaly visible before returning to managed land.
1409 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1412 mono_mb_emit_ldloc (mb, p_var);
1415 mono_mb_emit_byte (mb, CEE_RET);
1418 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
1419 info->d.alloc.gc_name = "sgen";
1420 info->d.alloc.alloc_type = atype;
1423 mb->init_locals = FALSE;
1426 res = mono_mb_create (mb, csig, 8, info);
1435 mono_gc_get_aligned_size_for_allocator (int size)
1437 return SGEN_ALIGN_UP (size);
1441 * Generate an allocator method implementing the fast path of mono_gc_alloc_obj ().
1442 * The signature of the called method is:
1443 * object allocate (MonoVTable *vtable)
1446 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box, gboolean known_instance_size)
1448 #ifdef MANAGED_ALLOCATION
1449 if (collect_before_allocs)
1451 if (!mono_runtime_has_tls_get ())
1453 if (klass->instance_size > tlab_size)
1455 if (known_instance_size && ALIGN_TO (klass->instance_size, SGEN_ALLOC_ALIGN) >= SGEN_MAX_SMALL_OBJ_SIZE)
1457 if (mono_class_has_finalizer (klass) || mono_class_is_marshalbyref (klass))
1461 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1463 if (klass->byval_arg.type == MONO_TYPE_STRING)
1464 return mono_gc_get_managed_allocator_by_type (ATYPE_STRING, MANAGED_ALLOCATOR_REGULAR);
1465 /* Generic classes have dynamic field and can go above MAX_SMALL_OBJ_SIZE. */
1466 if (known_instance_size)
1467 return mono_gc_get_managed_allocator_by_type (ATYPE_SMALL, MANAGED_ALLOCATOR_REGULAR);
1469 return mono_gc_get_managed_allocator_by_type (ATYPE_NORMAL, MANAGED_ALLOCATOR_REGULAR);
1476 mono_gc_get_managed_array_allocator (MonoClass *klass)
1478 #ifdef MANAGED_ALLOCATION
1479 if (klass->rank != 1)
1481 if (!mono_runtime_has_tls_get ())
1483 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1485 if (has_per_allocation_action)
1487 g_assert (!mono_class_has_finalizer (klass) && !mono_class_is_marshalbyref (klass));
1489 return mono_gc_get_managed_allocator_by_type (ATYPE_VECTOR, MANAGED_ALLOCATOR_REGULAR);
1496 sgen_set_use_managed_allocator (gboolean flag)
1498 use_managed_allocator = flag;
1502 mono_gc_get_managed_allocator_by_type (int atype, ManagedAllocatorVariant variant)
1504 #ifdef MANAGED_ALLOCATION
1508 if (variant == MANAGED_ALLOCATOR_REGULAR && !use_managed_allocator)
1511 if (variant == MANAGED_ALLOCATOR_REGULAR && !mono_runtime_has_tls_get ())
1515 case MANAGED_ALLOCATOR_REGULAR: cache = alloc_method_cache; break;
1516 case MANAGED_ALLOCATOR_SLOW_PATH: cache = slowpath_alloc_method_cache; break;
1517 default: g_assert_not_reached (); break;
1520 res = cache [atype];
1524 res = create_allocator (atype, variant);
1526 if (cache [atype]) {
1527 mono_free_method (res);
1528 res = cache [atype];
1530 mono_memory_barrier ();
1531 cache [atype] = res;
1542 mono_gc_get_managed_allocator_types (void)
1548 sgen_is_managed_allocator (MonoMethod *method)
1552 for (i = 0; i < ATYPE_NUM; ++i)
1553 if (method == alloc_method_cache [i] || method == slowpath_alloc_method_cache [i])
1559 sgen_has_managed_allocator (void)
1563 for (i = 0; i < ATYPE_NUM; ++i)
1564 if (alloc_method_cache [i] || slowpath_alloc_method_cache [i])
1570 * Cardtable scanning
1573 #define MWORD_MASK (sizeof (mword) - 1)
1576 find_card_offset (mword card)
1578 /*XXX Use assembly as this generates some pretty bad code */
1579 #if defined(__i386__) && defined(__GNUC__)
1580 return (__builtin_ffs (card) - 1) / 8;
1581 #elif defined(__x86_64__) && defined(__GNUC__)
1582 return (__builtin_ffsll (card) - 1) / 8;
1583 #elif defined(__s390x__)
1584 return (__builtin_ffsll (GUINT64_TO_LE(card)) - 1) / 8;
1587 guint8 *ptr = (guint8 *) &card;
1588 for (i = 0; i < sizeof (mword); ++i) {
1597 find_next_card (guint8 *card_data, guint8 *end)
1599 mword *cards, *cards_end;
1602 while ((((mword)card_data) & MWORD_MASK) && card_data < end) {
1608 if (card_data == end)
1611 cards = (mword*)card_data;
1612 cards_end = (mword*)((mword)end & ~MWORD_MASK);
1613 while (cards < cards_end) {
1616 return (guint8*)cards + find_card_offset (card);
1620 card_data = (guint8*)cards_end;
1621 while (card_data < end) {
1630 #define ARRAY_OBJ_INDEX(ptr,array,elem_size) (((char*)(ptr) - ((char*)(array) + G_STRUCT_OFFSET (MonoArray, vector))) / (elem_size))
1633 sgen_client_cardtable_scan_object (GCObject *obj, mword block_obj_size, guint8 *cards, ScanCopyContext ctx)
1635 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
1636 MonoClass *klass = vt->klass;
1638 SGEN_ASSERT (0, SGEN_VTABLE_HAS_REFERENCES (vt), "Why would we ever call this on reference-free objects?");
1641 MonoArray *arr = (MonoArray*)obj;
1642 guint8 *card_data, *card_base;
1643 guint8 *card_data_end;
1644 char *obj_start = (char *)sgen_card_table_align_pointer (obj);
1646 mword obj_size = sgen_mono_array_size (vt, arr, &bounds_size, sgen_vtable_get_descriptor (vt));
1647 /* We don't want to scan the bounds entries at the end of multidimensional arrays */
1648 char *obj_end = (char*)obj + obj_size - bounds_size;
1650 size_t extra_idx = 0;
1652 mword desc = (mword)klass->element_class->gc_descr;
1653 int elem_size = mono_array_element_size (klass);
1655 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1656 guint8 *overflow_scan_end = NULL;
1659 #ifdef SGEN_OBJECT_LAYOUT_STATISTICS
1660 if (klass->element_class->valuetype)
1661 sgen_object_layout_scanned_vtype_array ();
1663 sgen_object_layout_scanned_ref_array ();
1669 card_data = sgen_card_table_get_card_scan_address ((mword)obj);
1671 card_base = card_data;
1672 card_count = sgen_card_table_number_of_cards_in_range ((mword)obj, obj_size);
1673 card_data_end = card_data + card_count;
1676 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1677 /*Check for overflow and if so, setup to scan in two steps*/
1678 if (!cards && card_data_end >= SGEN_SHADOW_CARDTABLE_END) {
1679 overflow_scan_end = sgen_shadow_cardtable + (card_data_end - SGEN_SHADOW_CARDTABLE_END);
1680 card_data_end = SGEN_SHADOW_CARDTABLE_END;
1686 card_data = find_next_card (card_data, card_data_end);
1687 for (; card_data < card_data_end; card_data = find_next_card (card_data + 1, card_data_end)) {
1689 size_t idx = (card_data - card_base) + extra_idx;
1690 char *start = (char*)(obj_start + idx * CARD_SIZE_IN_BYTES);
1691 char *card_end = start + CARD_SIZE_IN_BYTES;
1692 char *first_elem, *elem;
1694 HEAVY_STAT (++los_marked_cards);
1697 sgen_card_table_prepare_card_for_scanning (card_data);
1699 card_end = MIN (card_end, obj_end);
1701 if (start <= (char*)arr->vector)
1704 index = ARRAY_OBJ_INDEX (start, obj, elem_size);
1706 elem = first_elem = (char*)mono_array_addr_with_size_fast ((MonoArray*)obj, elem_size, index);
1707 if (klass->element_class->valuetype) {
1708 ScanVTypeFunc scan_vtype_func = ctx.ops->scan_vtype;
1710 for (; elem < card_end; elem += elem_size)
1711 scan_vtype_func (obj, elem, desc, ctx.queue BINARY_PROTOCOL_ARG (elem_size));
1713 ScanPtrFieldFunc scan_ptr_field_func = ctx.ops->scan_ptr_field;
1715 HEAVY_STAT (++los_array_cards);
1716 for (; elem < card_end; elem += SIZEOF_VOID_P)
1717 scan_ptr_field_func (obj, (GCObject**)elem, ctx.queue);
1720 binary_protocol_card_scan (first_elem, elem - first_elem);
1723 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1724 if (overflow_scan_end) {
1725 extra_idx = card_data - card_base;
1726 card_base = card_data = sgen_shadow_cardtable;
1727 card_data_end = overflow_scan_end;
1728 overflow_scan_end = NULL;
1739 * Array and string allocation
1743 mono_gc_alloc_vector (MonoVTable *vtable, size_t size, uintptr_t max_length)
1748 if (!SGEN_CAN_ALIGN_UP (size))
1751 #ifndef DISABLE_CRITICAL_REGION
1752 ENTER_CRITICAL_REGION;
1753 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1755 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1756 arr->max_length = (mono_array_size_t)max_length;
1757 EXIT_CRITICAL_REGION;
1760 EXIT_CRITICAL_REGION;
1765 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1766 if (G_UNLIKELY (!arr)) {
1771 arr->max_length = (mono_array_size_t)max_length;
1776 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1777 mono_profiler_allocation (&arr->obj);
1779 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Vector has incorrect size.");
1784 mono_gc_alloc_array (MonoVTable *vtable, size_t size, uintptr_t max_length, uintptr_t bounds_size)
1787 MonoArrayBounds *bounds;
1790 if (!SGEN_CAN_ALIGN_UP (size))
1793 #ifndef DISABLE_CRITICAL_REGION
1794 ENTER_CRITICAL_REGION;
1795 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1797 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1798 arr->max_length = (mono_array_size_t)max_length;
1800 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1801 arr->bounds = bounds;
1802 EXIT_CRITICAL_REGION;
1805 EXIT_CRITICAL_REGION;
1810 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1811 if (G_UNLIKELY (!arr)) {
1816 arr->max_length = (mono_array_size_t)max_length;
1818 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1819 arr->bounds = bounds;
1824 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1825 mono_profiler_allocation (&arr->obj);
1827 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Array has incorrect size.");
1832 mono_gc_alloc_string (MonoVTable *vtable, size_t size, gint32 len)
1837 if (!SGEN_CAN_ALIGN_UP (size))
1840 #ifndef DISABLE_CRITICAL_REGION
1841 ENTER_CRITICAL_REGION;
1842 str = (MonoString*)sgen_try_alloc_obj_nolock (vtable, size);
1844 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1846 EXIT_CRITICAL_REGION;
1849 EXIT_CRITICAL_REGION;
1854 str = (MonoString*)sgen_alloc_obj_nolock (vtable, size);
1855 if (G_UNLIKELY (!str)) {
1865 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1866 mono_profiler_allocation (&str->object);
1876 mono_gc_set_string_length (MonoString *str, gint32 new_length)
1878 mono_unichar2 *new_end = str->chars + new_length;
1880 /* zero the discarded string. This null-delimits the string and allows
1881 * the space to be reclaimed by SGen. */
1883 if (nursery_canaries_enabled () && sgen_ptr_in_nursery (str)) {
1884 CHECK_CANARY_FOR_OBJECT ((GCObject*)str, TRUE);
1885 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2) + CANARY_SIZE);
1886 memcpy (new_end + 1 , CANARY_STRING, CANARY_SIZE);
1888 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2));
1891 str->length = new_length;
1898 #define GC_ROOT_NUM 32
1900 int count; /* must be the first field */
1901 void *objects [GC_ROOT_NUM];
1902 int root_types [GC_ROOT_NUM];
1903 uintptr_t extra_info [GC_ROOT_NUM];
1907 notify_gc_roots (GCRootReport *report)
1911 mono_profiler_gc_roots (report->count, report->objects, report->root_types, report->extra_info);
1916 add_profile_gc_root (GCRootReport *report, void *object, int rtype, uintptr_t extra_info)
1918 if (report->count == GC_ROOT_NUM)
1919 notify_gc_roots (report);
1920 report->objects [report->count] = object;
1921 report->root_types [report->count] = rtype;
1922 report->extra_info [report->count++] = (uintptr_t)SGEN_LOAD_VTABLE (object)->klass;
1926 sgen_client_nursery_objects_pinned (void **definitely_pinned, int count)
1928 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS) {
1929 GCRootReport report;
1932 for (idx = 0; idx < count; ++idx)
1933 add_profile_gc_root (&report, definitely_pinned [idx], MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
1934 notify_gc_roots (&report);
1939 report_finalizer_roots_from_queue (SgenPointerQueue *queue)
1941 GCRootReport report;
1945 for (i = 0; i < queue->next_slot; ++i) {
1946 void *obj = queue->data [i];
1949 add_profile_gc_root (&report, obj, MONO_PROFILE_GC_ROOT_FINALIZER, 0);
1951 notify_gc_roots (&report);
1955 report_finalizer_roots (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
1957 report_finalizer_roots_from_queue (fin_ready_queue);
1958 report_finalizer_roots_from_queue (critical_fin_queue);
1961 static GCRootReport *root_report;
1964 single_arg_report_root (MonoObject **obj, void *gc_data)
1967 add_profile_gc_root (root_report, *obj, MONO_PROFILE_GC_ROOT_OTHER, 0);
1971 precisely_report_roots_from (GCRootReport *report, void** start_root, void** end_root, mword desc)
1973 switch (desc & ROOT_DESC_TYPE_MASK) {
1974 case ROOT_DESC_BITMAP:
1975 desc >>= ROOT_DESC_TYPE_SHIFT;
1977 if ((desc & 1) && *start_root) {
1978 add_profile_gc_root (report, *start_root, MONO_PROFILE_GC_ROOT_OTHER, 0);
1984 case ROOT_DESC_COMPLEX: {
1985 gsize *bitmap_data = (gsize *)sgen_get_complex_descriptor_bitmap (desc);
1986 gsize bwords = (*bitmap_data) - 1;
1987 void **start_run = start_root;
1989 while (bwords-- > 0) {
1990 gsize bmap = *bitmap_data++;
1991 void **objptr = start_run;
1993 if ((bmap & 1) && *objptr) {
1994 add_profile_gc_root (report, *objptr, MONO_PROFILE_GC_ROOT_OTHER, 0);
1999 start_run += GC_BITS_PER_WORD;
2003 case ROOT_DESC_USER: {
2004 MonoGCRootMarkFunc marker = (MonoGCRootMarkFunc)sgen_get_user_descriptor_func (desc);
2005 root_report = report;
2006 marker ((MonoObject**)start_root, single_arg_report_root, NULL);
2009 case ROOT_DESC_RUN_LEN:
2010 g_assert_not_reached ();
2012 g_assert_not_reached ();
2017 report_registered_roots_by_type (int root_type)
2019 GCRootReport report;
2023 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], void **, start_root, RootRecord *, root) {
2024 SGEN_LOG (6, "Precise root scan %p-%p (desc: %p)", start_root, root->end_root, (void*)root->root_desc);
2025 precisely_report_roots_from (&report, start_root, (void**)root->end_root, root->root_desc);
2026 } SGEN_HASH_TABLE_FOREACH_END;
2027 notify_gc_roots (&report);
2031 report_registered_roots (void)
2033 report_registered_roots_by_type (ROOT_TYPE_NORMAL);
2034 report_registered_roots_by_type (ROOT_TYPE_WBARRIER);
2038 sgen_client_collecting_minor (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2040 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2041 report_registered_roots ();
2042 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2043 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2046 static GCRootReport major_root_report;
2047 static gboolean profile_roots;
2050 sgen_client_collecting_major_1 (void)
2052 profile_roots = mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS;
2053 memset (&major_root_report, 0, sizeof (GCRootReport));
2057 sgen_client_pinned_los_object (GCObject *obj)
2060 add_profile_gc_root (&major_root_report, (char*)obj, MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
2064 sgen_client_collecting_major_2 (void)
2067 notify_gc_roots (&major_root_report);
2069 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2070 report_registered_roots ();
2074 sgen_client_collecting_major_3 (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2076 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2077 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2080 #define MOVED_OBJECTS_NUM 64
2081 static void *moved_objects [MOVED_OBJECTS_NUM];
2082 static int moved_objects_idx = 0;
2084 static SgenPointerQueue moved_objects_queue = SGEN_POINTER_QUEUE_INIT (INTERNAL_MEM_MOVED_OBJECT);
2087 mono_sgen_register_moved_object (void *obj, void *destination)
2090 * This function can be called from SGen's worker threads. We want to try
2091 * and avoid exposing those threads to the profiler API, so queue up move
2092 * events and send them later when the main GC thread calls
2093 * mono_sgen_gc_event_moves ().
2095 * TODO: Once SGen has multiple worker threads, we need to switch to a
2096 * lock-free data structure for the queue as multiple threads will be
2097 * adding to it at the same time.
2099 if (sgen_thread_pool_is_thread_pool_thread (mono_native_thread_id_get ())) {
2100 sgen_pointer_queue_add (&moved_objects_queue, obj);
2101 sgen_pointer_queue_add (&moved_objects_queue, destination);
2103 if (moved_objects_idx == MOVED_OBJECTS_NUM) {
2104 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2105 moved_objects_idx = 0;
2108 moved_objects [moved_objects_idx++] = obj;
2109 moved_objects [moved_objects_idx++] = destination;
2114 mono_sgen_gc_event_moves (void)
2116 while (!sgen_pointer_queue_is_empty (&moved_objects_queue)) {
2117 void *dst = sgen_pointer_queue_pop (&moved_objects_queue);
2118 void *src = sgen_pointer_queue_pop (&moved_objects_queue);
2120 mono_sgen_register_moved_object (src, dst);
2123 if (moved_objects_idx) {
2124 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2125 moved_objects_idx = 0;
2133 #define REFS_SIZE 128
2136 MonoGCReferences callback;
2140 MonoObject *refs [REFS_SIZE];
2141 uintptr_t offsets [REFS_SIZE];
2145 #define HANDLE_PTR(ptr,obj) do { \
2147 if (hwi->count == REFS_SIZE) { \
2148 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data); \
2152 hwi->offsets [hwi->count] = (char*)(ptr)-(char*)start; \
2153 hwi->refs [hwi->count++] = *(ptr); \
2158 collect_references (HeapWalkInfo *hwi, GCObject *obj, size_t size)
2160 char *start = (char*)obj;
2161 mword desc = sgen_obj_get_descriptor (obj);
2163 #include "sgen/sgen-scan-object.h"
2167 walk_references (GCObject *start, size_t size, void *data)
2169 HeapWalkInfo *hwi = (HeapWalkInfo *)data;
2172 collect_references (hwi, start, size);
2173 if (hwi->count || !hwi->called)
2174 hwi->callback (start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data);
2178 * mono_gc_walk_heap:
2179 * @flags: flags for future use
2180 * @callback: a function pointer called for each object in the heap
2181 * @data: a user data pointer that is passed to callback
2183 * This function can be used to iterate over all the live objects in the heap:
2184 * for each object, @callback is invoked, providing info about the object's
2185 * location in memory, its class, its size and the objects it references.
2186 * For each referenced object it's offset from the object address is
2187 * reported in the offsets array.
2188 * The object references may be buffered, so the callback may be invoked
2189 * multiple times for the same object: in all but the first call, the size
2190 * argument will be zero.
2191 * Note that this function can be only called in the #MONO_GC_EVENT_PRE_START_WORLD
2192 * profiler event handler.
2194 * Returns: a non-zero value if the GC doesn't support heap walking
2197 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
2202 hwi.callback = callback;
2205 sgen_clear_nursery_fragments ();
2206 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data, walk_references, &hwi, FALSE, TRUE);
2208 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, walk_references, &hwi);
2209 sgen_los_iterate_objects (walk_references, &hwi);
2219 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
2221 gc_callbacks = *callbacks;
2225 mono_gc_get_gc_callbacks ()
2227 return &gc_callbacks;
2231 sgen_client_thread_register (SgenThreadInfo* info, void *stack_bottom_fallback)
2234 guint8 *staddr = NULL;
2236 #ifndef HAVE_KW_THREAD
2237 g_assert (!mono_native_tls_get_value (thread_info_key));
2238 mono_native_tls_set_value (thread_info_key, info);
2240 sgen_thread_info = info;
2243 info->client_info.skip = 0;
2245 info->client_info.stack_start = NULL;
2247 #ifdef SGEN_POSIX_STW
2248 info->client_info.stop_count = -1;
2249 info->client_info.signal = 0;
2252 mono_thread_info_get_stack_bounds (&staddr, &stsize);
2254 info->client_info.stack_start_limit = staddr;
2255 info->client_info.stack_end = staddr + stsize;
2257 gsize stack_bottom = (gsize)stack_bottom_fallback;
2258 stack_bottom += 4095;
2259 stack_bottom &= ~4095;
2260 info->client_info.stack_end = (char*)stack_bottom;
2263 memset (&info->client_info.ctx, 0, sizeof (MonoContext));
2265 if (mono_gc_get_gc_callbacks ()->thread_attach_func)
2266 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2268 binary_protocol_thread_register ((gpointer)mono_thread_info_get_tid (info));
2270 SGEN_LOG (3, "registered thread %p (%p) stack end %p", info, (gpointer)mono_thread_info_get_tid (info), info->client_info.stack_end);
2272 info->client_info.info.handle_stack = mono_handle_stack_alloc ();
2276 sgen_client_thread_unregister (SgenThreadInfo *p)
2278 MonoNativeThreadId tid;
2280 #ifndef HAVE_KW_THREAD
2281 mono_native_tls_set_value (thread_info_key, NULL);
2283 sgen_thread_info = NULL;
2286 tid = mono_thread_info_get_tid (p);
2288 if (p->client_info.info.runtime_thread)
2289 mono_threads_add_joinable_thread ((gpointer)tid);
2291 if (mono_gc_get_gc_callbacks ()->thread_detach_func) {
2292 mono_gc_get_gc_callbacks ()->thread_detach_func (p->client_info.runtime_data);
2293 p->client_info.runtime_data = NULL;
2296 binary_protocol_thread_unregister ((gpointer)tid);
2297 SGEN_LOG (3, "unregister thread %p (%p)", p, (gpointer)tid);
2299 HandleStack *handles = (HandleStack*) p->client_info.info.handle_stack;
2300 p->client_info.info.handle_stack = NULL;
2301 mono_handle_stack_free (handles);
2305 mono_gc_set_skip_thread (gboolean skip)
2307 SgenThreadInfo *info = mono_thread_info_current ();
2310 info->client_info.gc_disabled = skip;
2315 thread_in_critical_region (SgenThreadInfo *info)
2317 return info->client_info.in_critical_region;
2321 sgen_thread_attach (SgenThreadInfo *info)
2323 if (mono_gc_get_gc_callbacks ()->thread_attach_func && !info->client_info.runtime_data)
2324 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2328 sgen_thread_detach (SgenThreadInfo *p)
2330 /* If a delegate is passed to native code and invoked on a thread we dont
2331 * know about, marshal will register it with mono_threads_attach_coop, but
2332 * we have no way of knowing when that thread goes away. SGen has a TSD
2333 * so we assume that if the domain is still registered, we can detach
2336 if (mono_thread_internal_current_is_attached ())
2337 mono_thread_detach_internal (mono_thread_internal_current ());
2341 mono_gc_register_thread (void *baseptr)
2343 return mono_thread_info_attach (baseptr) != NULL;
2347 mono_gc_is_gc_thread (void)
2351 result = mono_thread_info_current () != NULL;
2357 sgen_client_thread_register_worker (void)
2359 mono_thread_info_register_small_id ();
2360 mono_native_thread_set_name (mono_native_thread_id_get (), "SGen worker");
2363 /* Variables holding start/end nursery so it won't have to be passed at every call */
2364 static void *scan_area_arg_start, *scan_area_arg_end;
2367 mono_gc_conservatively_scan_area (void *start, void *end)
2369 sgen_conservatively_pin_objects_from ((void **)start, (void **)end, scan_area_arg_start, scan_area_arg_end, PIN_TYPE_STACK);
2373 mono_gc_scan_object (void *obj, void *gc_data)
2375 ScanCopyContext *ctx = (ScanCopyContext *)gc_data;
2376 ctx->ops->copy_or_mark_object ((GCObject**)&obj, ctx->queue);
2381 * Mark from thread stacks and registers.
2384 sgen_client_scan_thread_data (void *start_nursery, void *end_nursery, gboolean precise, ScanCopyContext ctx)
2386 scan_area_arg_start = start_nursery;
2387 scan_area_arg_end = end_nursery;
2389 FOREACH_THREAD (info) {
2390 int skip_reason = 0;
2391 void *aligned_stack_start;
2393 if (info->client_info.skip) {
2394 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);
2396 } else if (info->client_info.gc_disabled) {
2397 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);
2399 } else if (!mono_thread_info_is_live (info)) {
2400 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);
2402 } else if (!info->client_info.stack_start) {
2403 SGEN_LOG (3, "Skipping starting or detaching thread %p", info);
2407 binary_protocol_scan_stack ((gpointer)mono_thread_info_get_tid (info), info->client_info.stack_start, info->client_info.stack_end, skip_reason);
2412 g_assert (info->client_info.stack_start);
2413 g_assert (info->client_info.stack_end);
2415 aligned_stack_start = (void*)(mword) ALIGN_TO ((mword)info->client_info.stack_start, SIZEOF_VOID_P);
2417 /* Windows uses a guard page before the committed stack memory pages to detect when the
2418 stack needs to be grown. If we suspend a thread just after a function prolog has
2419 decremented the stack pointer to point into the guard page but before the thread has
2420 been able to read or write to that page, starting the stack scan at aligned_stack_start
2421 will raise a STATUS_GUARD_PAGE_VIOLATION and the process will crash. This code uses
2422 VirtualQuery() to determine whether stack_start points into the guard page and then
2423 updates aligned_stack_start to point at the next non-guard page. */
2424 MEMORY_BASIC_INFORMATION mem_info;
2425 SIZE_T result = VirtualQuery(info->client_info.stack_start, &mem_info, sizeof(mem_info));
2426 g_assert (result != 0);
2427 if (mem_info.Protect & PAGE_GUARD) {
2428 aligned_stack_start = ((char*) mem_info.BaseAddress) + mem_info.RegionSize;
2432 g_assert (info->client_info.suspend_done);
2433 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 ());
2434 if (mono_gc_get_gc_callbacks ()->thread_mark_func && !conservative_stack_mark) {
2435 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);
2436 } else if (!precise) {
2437 if (!conservative_stack_mark) {
2438 fprintf (stderr, "Precise stack mark not supported - disabling.\n");
2439 conservative_stack_mark = TRUE;
2441 //FIXME we should eventually use the new stack_mark from coop
2442 sgen_conservatively_pin_objects_from ((void **)aligned_stack_start, (void **)info->client_info.stack_end, start_nursery, end_nursery, PIN_TYPE_STACK);
2446 sgen_conservatively_pin_objects_from ((void**)&info->client_info.ctx, (void**)(&info->client_info.ctx + 1),
2447 start_nursery, end_nursery, PIN_TYPE_STACK);
2450 // This is used on Coop GC for platforms where we cannot get the data for individual registers.
2451 // We force a spill of all registers into the stack and pass a chunk of data into sgen.
2452 //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
2453 MonoThreadUnwindState *state = &info->client_info.info.thread_saved_state [SELF_SUSPEND_STATE_INDEX];
2454 if (state && state->gc_stackdata) {
2455 sgen_conservatively_pin_objects_from ((void **)state->gc_stackdata, (void**)((char*)state->gc_stackdata + state->gc_stackdata_size),
2456 start_nursery, end_nursery, PIN_TYPE_STACK);
2460 if (precise && info->client_info.info.handle_stack) {
2461 mono_handle_stack_scan ((HandleStack*)info->client_info.info.handle_stack, (GcScanFunc)ctx.ops->copy_or_mark_object, ctx.queue);
2463 } FOREACH_THREAD_END
2467 * mono_gc_set_stack_end:
2469 * Set the end of the current threads stack to STACK_END. The stack space between
2470 * STACK_END and the real end of the threads stack will not be scanned during collections.
2473 mono_gc_set_stack_end (void *stack_end)
2475 SgenThreadInfo *info;
2478 info = mono_thread_info_current ();
2480 SGEN_ASSERT (0, stack_end < info->client_info.stack_end, "Can only lower stack end");
2481 info->client_info.stack_end = stack_end;
2491 mono_gc_register_root (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2493 return sgen_register_root (start, size, descr, descr ? ROOT_TYPE_NORMAL : ROOT_TYPE_PINNED, source, msg);
2497 mono_gc_register_root_wbarrier (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2499 return sgen_register_root (start, size, descr, ROOT_TYPE_WBARRIER, source, msg);
2503 mono_gc_deregister_root (char* addr)
2505 sgen_deregister_root (addr);
2514 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
2516 return pthread_create (new_thread, attr, start_routine, arg);
2525 sgen_client_total_allocated_heap_changed (size_t allocated_heap)
2527 mono_runtime_resource_check_limit (MONO_RESOURCE_GC_HEAP, allocated_heap);
2531 mono_gc_user_markers_supported (void)
2537 mono_object_is_alive (MonoObject* o)
2543 mono_gc_get_generation (MonoObject *obj)
2545 if (sgen_ptr_in_nursery (obj))
2551 mono_gc_get_gc_name (void)
2557 mono_gc_get_description (void)
2559 #ifdef HAVE_CONC_GC_AS_DEFAULT
2560 return g_strdup ("sgen (concurrent by default)");
2562 return g_strdup ("sgen");
2567 mono_gc_set_desktop_mode (void)
2572 mono_gc_is_moving (void)
2578 mono_gc_is_disabled (void)
2584 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
2591 mono_gc_max_generation (void)
2597 mono_gc_precise_stack_mark_enabled (void)
2599 return !conservative_stack_mark;
2603 mono_gc_collect (int generation)
2605 sgen_gc_collect (generation);
2609 mono_gc_collection_count (int generation)
2611 return sgen_gc_collection_count (generation);
2615 mono_gc_get_used_size (void)
2617 return (int64_t)sgen_gc_get_used_size ();
2621 mono_gc_get_heap_size (void)
2623 return (int64_t)sgen_gc_get_total_heap_allocation ();
2627 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
2629 return sgen_make_user_root_descriptor (marker);
2633 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
2635 return SGEN_DESC_STRING;
2639 mono_gc_get_nursery (int *shift_bits, size_t *size)
2641 *size = sgen_nursery_size;
2642 *shift_bits = DEFAULT_NURSERY_BITS;
2643 return sgen_get_nursery_start ();
2647 mono_gc_get_los_limit (void)
2649 return SGEN_MAX_SMALL_OBJ_SIZE;
2653 sgen_client_default_metadata (void)
2655 return mono_domain_get ();
2659 sgen_client_metadata_for_object (GCObject *obj)
2661 return mono_object_domain (obj);
2665 * mono_gchandle_is_in_domain:
2666 * @gchandle: a GCHandle's handle.
2667 * @domain: An application domain.
2669 * Returns: TRUE if the object wrapped by the @gchandle belongs to the specific @domain.
2672 mono_gchandle_is_in_domain (guint32 gchandle, MonoDomain *domain)
2674 MonoDomain *gchandle_domain = (MonoDomain *)sgen_gchandle_get_metadata (gchandle);
2675 return domain->domain_id == gchandle_domain->domain_id;
2679 * mono_gchandle_free_domain:
2680 * @unloading: domain that is unloading
2682 * Function used internally to cleanup any GC handle for objects belonging
2683 * to the specified domain during appdomain unload.
2686 mono_gchandle_free_domain (MonoDomain *unloading)
2691 null_link_if_in_domain (gpointer hidden, GCHandleType handle_type, int max_generation, gpointer user)
2693 MonoDomain *unloading_domain = (MonoDomain *)user;
2694 MonoDomain *obj_domain;
2695 gboolean is_weak = MONO_GC_HANDLE_TYPE_IS_WEAK (handle_type);
2696 if (MONO_GC_HANDLE_IS_OBJECT_POINTER (hidden)) {
2697 MonoObject *obj = (MonoObject *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2698 obj_domain = mono_object_domain (obj);
2700 obj_domain = (MonoDomain *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2702 if (unloading_domain->domain_id == obj_domain->domain_id)
2708 sgen_null_links_for_domain (MonoDomain *domain)
2711 for (type = HANDLE_TYPE_MIN; type < HANDLE_TYPE_MAX; ++type)
2712 sgen_gchandle_iterate ((GCHandleType)type, GENERATION_OLD, null_link_if_in_domain, domain);
2716 mono_gchandle_set_target (guint32 gchandle, MonoObject *obj)
2718 sgen_gchandle_set_target (gchandle, obj);
2722 sgen_client_gchandle_created (int handle_type, GCObject *obj, guint32 handle)
2724 #ifndef DISABLE_PERFCOUNTERS
2725 mono_perfcounters->gc_num_handles++;
2727 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_CREATED, handle_type, handle, obj);
2731 sgen_client_gchandle_destroyed (int handle_type, guint32 handle)
2733 #ifndef DISABLE_PERFCOUNTERS
2734 mono_perfcounters->gc_num_handles--;
2736 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_DESTROYED, handle_type, handle, NULL);
2740 sgen_client_ensure_weak_gchandles_accessible (void)
2743 * During the second bridge processing step the world is
2744 * running again. That step processes all weak links once
2745 * more to null those that refer to dead objects. Before that
2746 * is completed, those links must not be followed, so we
2747 * conservatively wait for bridge processing when any weak
2748 * link is dereferenced.
2750 /* FIXME: A GC can occur after this check fails, in which case we
2751 * should wait for bridge processing but would fail to do so.
2753 if (G_UNLIKELY (bridge_processing_in_progress))
2754 mono_gc_wait_for_bridge_processing ();
2758 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
2762 result = func (data);
2763 UNLOCK_INTERRUPTION;
2768 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
2774 mono_gc_get_card_table (int *shift_bits, gpointer *mask)
2776 return sgen_get_card_table_configuration (shift_bits, mask);
2780 mono_gc_card_table_nursery_check (void)
2782 return !sgen_get_major_collector ()->is_concurrent;
2785 /* Negative value to remove */
2787 mono_gc_add_memory_pressure (gint64 value)
2789 /* FIXME: Implement at some point? */
2797 sgen_client_degraded_allocation (size_t size)
2799 static int last_major_gc_warned = -1;
2800 static int num_degraded = 0;
2802 if (last_major_gc_warned < (int)gc_stats.major_gc_count) {
2804 if (num_degraded == 1 || num_degraded == 3)
2805 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Degraded allocation. Consider increasing nursery-size if the warning persists.");
2806 else if (num_degraded == 10)
2807 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Repeated degraded allocation. Consider increasing nursery-size.");
2808 last_major_gc_warned = gc_stats.major_gc_count;
2817 sgen_client_description_for_internal_mem_type (int type)
2820 case INTERNAL_MEM_EPHEMERON_LINK: return "ephemeron-link";
2821 case INTERNAL_MEM_MOVED_OBJECT: return "moved-object";
2828 sgen_client_pre_collection_checks (void)
2830 if (sgen_mono_xdomain_checks) {
2831 sgen_clear_nursery_fragments ();
2832 sgen_check_for_xdomain_refs ();
2837 sgen_client_vtable_is_inited (MonoVTable *vt)
2839 return vt->klass->inited;
2843 sgen_client_vtable_get_namespace (MonoVTable *vt)
2845 return vt->klass->name_space;
2849 sgen_client_vtable_get_name (MonoVTable *vt)
2851 return vt->klass->name;
2859 sgen_client_init (void)
2862 MonoThreadInfoCallbacks cb;
2864 cb.thread_register = sgen_thread_register;
2865 cb.thread_detach = sgen_thread_detach;
2866 cb.thread_unregister = sgen_thread_unregister;
2867 cb.thread_attach = sgen_thread_attach;
2868 cb.mono_thread_in_critical_region = thread_in_critical_region;
2869 cb.ip_in_critical_region = ip_in_critical_region;
2871 mono_threads_init (&cb, sizeof (SgenThreadInfo));
2873 ///* Keep this the default for now */
2874 /* Precise marking is broken on all supported targets. Disable until fixed. */
2875 conservative_stack_mark = TRUE;
2877 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_EPHEMERON_LINK, sizeof (EphemeronLinkNode));
2879 mono_sgen_init_stw ();
2881 #ifndef HAVE_KW_THREAD
2882 mono_native_tls_alloc (&thread_info_key, NULL);
2883 #if defined(TARGET_OSX) || defined(TARGET_WIN32) || defined(TARGET_ANDROID) || defined(TARGET_IOS)
2885 * CEE_MONO_TLS requires the tls offset, not the key, so the code below only works on darwin,
2886 * where the two are the same.
2888 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO, thread_info_key);
2892 int tls_offset = -1;
2893 MONO_THREAD_VAR_OFFSET (sgen_thread_info, tls_offset);
2894 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO, tls_offset);
2898 mono_gc_register_thread (&dummy);
2902 sgen_client_handle_gc_param (const char *opt)
2904 if (g_str_has_prefix (opt, "stack-mark=")) {
2905 opt = strchr (opt, '=') + 1;
2906 if (!strcmp (opt, "precise")) {
2907 conservative_stack_mark = FALSE;
2908 } else if (!strcmp (opt, "conservative")) {
2909 conservative_stack_mark = TRUE;
2911 sgen_env_var_error (MONO_GC_PARAMS_NAME, conservative_stack_mark ? "Using `conservative`." : "Using `precise`.",
2912 "Invalid value `%s` for `stack-mark` option, possible values are: `precise`, `conservative`.", opt);
2914 } else if (g_str_has_prefix (opt, "bridge-implementation=")) {
2915 opt = strchr (opt, '=') + 1;
2916 sgen_set_bridge_implementation (opt);
2917 } else if (g_str_has_prefix (opt, "toggleref-test")) {
2918 /* FIXME: This should probably in MONO_GC_DEBUG */
2919 sgen_register_test_toggleref_callback ();
2920 } else if (!sgen_bridge_handle_gc_param (opt)) {
2927 sgen_client_print_gc_params_usage (void)
2929 fprintf (stderr, " stack-mark=MARK-METHOD (where MARK-METHOD is 'precise' or 'conservative')\n");
2933 sgen_client_handle_gc_debug (const char *opt)
2935 if (!strcmp (opt, "xdomain-checks")) {
2936 sgen_mono_xdomain_checks = TRUE;
2937 } else if (!strcmp (opt, "do-not-finalize")) {
2938 mono_do_not_finalize = TRUE;
2939 } else if (g_str_has_prefix (opt, "do-not-finalize=")) {
2940 opt = strchr (opt, '=') + 1;
2941 mono_do_not_finalize = TRUE;
2942 mono_do_not_finalize_class_names = g_strsplit (opt, ",", 0);
2943 } else if (!strcmp (opt, "log-finalizers")) {
2944 log_finalizers = TRUE;
2945 } else if (!strcmp (opt, "no-managed-allocator")) {
2946 sgen_set_use_managed_allocator (FALSE);
2947 } else if (!sgen_bridge_handle_gc_debug (opt)) {
2954 sgen_client_print_gc_debug_usage (void)
2956 fprintf (stderr, " xdomain-checks\n");
2957 fprintf (stderr, " do-not-finalize\n");
2958 fprintf (stderr, " log-finalizers\n");
2959 fprintf (stderr, " no-managed-allocator\n");
2960 sgen_bridge_print_gc_debug_usage ();
2965 sgen_client_get_provenance (void)
2967 #ifdef SGEN_OBJECT_PROVENANCE
2968 MonoGCCallbacks *cb = mono_gc_get_gc_callbacks ();
2969 gpointer (*get_provenance_func) (void);
2972 get_provenance_func = cb->get_provenance_func;
2973 if (get_provenance_func)
2974 return get_provenance_func ();
2982 sgen_client_describe_invalid_pointer (GCObject *ptr)
2984 sgen_bridge_describe_pointer (ptr);
2987 static gboolean gc_inited;
2990 mono_gc_base_init (void)
2995 mono_counters_init ();
2998 mono_w32handle_init ();
3001 #ifdef HEAVY_STATISTICS
3002 mono_counters_register ("los marked cards", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_marked_cards);
3003 mono_counters_register ("los array cards scanned ", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_cards);
3004 mono_counters_register ("los array remsets", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_remsets);
3006 mono_counters_register ("WBarrier set arrayref", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_set_arrayref);
3007 mono_counters_register ("WBarrier value copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_value_copy);
3008 mono_counters_register ("WBarrier object copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_object_copy);
3013 if (nursery_canaries_enabled ())
3014 sgen_set_use_managed_allocator (FALSE);
3016 #if defined(HAVE_KW_THREAD)
3017 /* This can happen with using libmonosgen.so */
3018 if (mono_tls_key_get_offset (TLS_KEY_SGEN_THREAD_INFO) == -1)
3019 sgen_set_use_managed_allocator (FALSE);
3026 mono_gc_base_cleanup (void)
3028 sgen_thread_pool_shutdown ();
3030 // We should have consumed any outstanding moves.
3031 g_assert (sgen_pointer_queue_is_empty (&moved_objects_queue));
3035 mono_gc_is_null (void)