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);
248 #ifdef HAVE_ONLINE_VES
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);
320 #ifdef HAVE_ONLINE_VES
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 FOREACH_THREAD (info) {
897 mono_handle_stack_free_domain ((HandleStack*)info->client_info.info.handle_stack, domain);
900 if (sgen_mono_xdomain_checks && domain != mono_get_root_domain ()) {
901 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_NORMAL);
902 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_WBARRIER);
903 sgen_check_for_xdomain_refs ();
906 /*Ephemerons and dislinks must be processed before LOS since they might end up pointing
907 to memory returned to the OS.*/
908 null_ephemerons_for_domain (domain);
909 sgen_null_links_for_domain (domain);
911 for (i = GENERATION_NURSERY; i < GENERATION_MAX; ++i)
912 sgen_remove_finalizers_if (object_in_domain_predicate, domain, i);
914 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
915 (IterateObjectCallbackFunc)clear_domain_process_minor_object_callback, domain, FALSE, TRUE);
917 /* We need two passes over major and large objects because
918 freeing such objects might give their memory back to the OS
919 (in the case of large objects) or obliterate its vtable
920 (pinned objects with major-copying or pinned and non-pinned
921 objects with major-mark&sweep), but we might need to
922 dereference a pointer from an object to another object if
923 the first object is a proxy. */
924 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, (IterateObjectCallbackFunc)clear_domain_process_major_object_callback, domain);
925 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
926 clear_domain_process_object ((GCObject*)bigobj->data, domain);
929 for (bigobj = los_object_list; bigobj;) {
930 if (need_remove_object_for_domain ((GCObject*)bigobj->data, domain)) {
931 LOSObject *to_free = bigobj;
933 prev->next = bigobj->next;
935 los_object_list = bigobj->next;
936 bigobj = bigobj->next;
937 SGEN_LOG (4, "Freeing large object %p", bigobj->data);
938 sgen_los_free_object (to_free);
942 bigobj = bigobj->next;
944 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_NON_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_non_pinned_object_callback, domain);
945 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_pinned_object_callback, domain);
947 if (domain == mono_get_root_domain ()) {
948 sgen_pin_stats_report ();
949 sgen_object_layout_dump (stdout);
952 sgen_restart_world (0);
954 binary_protocol_domain_unload_end (domain);
955 binary_protocol_flush_buffers (FALSE);
965 mono_gc_alloc_obj (MonoVTable *vtable, size_t size)
967 MonoObject *obj = sgen_alloc_obj (vtable, size);
969 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
971 mono_profiler_allocation (obj);
978 mono_gc_alloc_pinned_obj (MonoVTable *vtable, size_t size)
980 MonoObject *obj = sgen_alloc_obj_pinned (vtable, size);
982 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
984 mono_profiler_allocation (obj);
991 mono_gc_alloc_mature (MonoVTable *vtable, size_t size)
993 MonoObject *obj = sgen_alloc_obj_mature (vtable, size);
995 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
997 mono_profiler_allocation (obj);
1004 * mono_gc_alloc_fixed:
1007 mono_gc_alloc_fixed (size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
1009 /* FIXME: do a single allocation */
1010 void *res = g_calloc (1, size);
1013 if (!mono_gc_register_root ((char *)res, size, descr, source, msg)) {
1021 * mono_gc_free_fixed:
1024 mono_gc_free_fixed (void* addr)
1026 mono_gc_deregister_root ((char *)addr);
1034 static MonoMethod* alloc_method_cache [ATYPE_NUM];
1035 static MonoMethod* slowpath_alloc_method_cache [ATYPE_NUM];
1036 static gboolean use_managed_allocator = TRUE;
1038 #ifdef MANAGED_ALLOCATION
1039 // Cache the SgenThreadInfo pointer in a local 'var'.
1040 #define EMIT_TLS_ACCESS_VAR(mb, var) \
1042 var = mono_mb_add_local ((mb), &mono_defaults.int_class->byval_arg); \
1043 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1044 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1045 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1046 mono_mb_emit_stloc ((mb), (var)); \
1049 #define EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR(mb, var) \
1051 mono_mb_emit_ldloc ((mb), (var)); \
1052 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenClientThreadInfo, in_critical_region)); \
1053 mono_mb_emit_byte ((mb), CEE_ADD); \
1056 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb, var) do { \
1057 mono_mb_emit_ldloc ((mb), (var)); \
1058 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_next)); \
1059 mono_mb_emit_byte ((mb), CEE_ADD); \
1062 #define EMIT_TLS_ACCESS_TEMP_END(mb, var) do { \
1063 mono_mb_emit_ldloc ((mb), (var)); \
1064 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_temp_end)); \
1065 mono_mb_emit_byte ((mb), CEE_ADD); \
1066 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1069 /* FIXME: Do this in the JIT, where specialized allocation sequences can be created
1070 * for each class. This is currently not easy to do, as it is hard to generate basic
1071 * blocks + branches, but it is easy with the linear IL codebase.
1073 * For this to work we'd need to solve the TLAB race, first. Now we
1074 * require the allocator to be in a few known methods to make sure
1075 * that they are executed atomically via the restart mechanism.
1078 create_allocator (int atype, ManagedAllocatorVariant variant)
1080 int p_var, size_var, real_size_var, thread_var G_GNUC_UNUSED;
1081 gboolean slowpath = variant == MANAGED_ALLOCATOR_SLOW_PATH;
1082 guint32 fastpath_branch, max_size_branch, no_oom_branch;
1083 MonoMethodBuilder *mb;
1085 MonoMethodSignature *csig;
1086 static gboolean registered = FALSE;
1087 int tlab_next_addr_var, new_next_var;
1088 const char *name = NULL;
1093 mono_register_jit_icall (mono_gc_alloc_obj, "mono_gc_alloc_obj", mono_create_icall_signature ("object ptr int"), FALSE);
1094 mono_register_jit_icall (mono_gc_alloc_vector, "mono_gc_alloc_vector", mono_create_icall_signature ("object ptr int int"), FALSE);
1095 mono_register_jit_icall (mono_gc_alloc_string, "mono_gc_alloc_string", mono_create_icall_signature ("object ptr int int32"), FALSE);
1099 if (atype == ATYPE_SMALL) {
1100 name = slowpath ? "SlowAllocSmall" : "AllocSmall";
1101 } else if (atype == ATYPE_NORMAL) {
1102 name = slowpath ? "SlowAlloc" : "Alloc";
1103 } else if (atype == ATYPE_VECTOR) {
1104 name = slowpath ? "SlowAllocVector" : "AllocVector";
1105 } else if (atype == ATYPE_STRING) {
1106 name = slowpath ? "SlowAllocString" : "AllocString";
1108 g_assert_not_reached ();
1111 if (atype == ATYPE_NORMAL)
1116 csig = mono_metadata_signature_alloc (mono_defaults.corlib, num_params);
1117 if (atype == ATYPE_STRING) {
1118 csig->ret = &mono_defaults.string_class->byval_arg;
1119 csig->params [0] = &mono_defaults.int_class->byval_arg;
1120 csig->params [1] = &mono_defaults.int32_class->byval_arg;
1122 csig->ret = &mono_defaults.object_class->byval_arg;
1123 for (i = 0; i < num_params; i++)
1124 csig->params [i] = &mono_defaults.int_class->byval_arg;
1127 mb = mono_mb_new (mono_defaults.object_class, name, MONO_WRAPPER_ALLOC);
1129 #ifdef HAVE_ONLINE_VES
1134 mono_mb_emit_ldarg (mb, 0);
1135 mono_mb_emit_icall (mb, ves_icall_object_new_specific);
1138 mono_mb_emit_ldarg (mb, 0);
1139 mono_mb_emit_ldarg (mb, 1);
1140 mono_mb_emit_icall (mb, ves_icall_array_new_specific);
1143 mono_mb_emit_ldarg (mb, 1);
1144 mono_mb_emit_icall (mb, ves_icall_string_alloc);
1147 g_assert_not_reached ();
1154 * Tls access might call foreign code or code without jinfo. This can
1155 * only happen if we are outside of the critical region.
1157 EMIT_TLS_ACCESS_VAR (mb, thread_var);
1159 size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1160 if (atype == ATYPE_SMALL) {
1161 /* size_var = size_arg */
1162 mono_mb_emit_ldarg (mb, 1);
1163 mono_mb_emit_stloc (mb, size_var);
1164 } else if (atype == ATYPE_NORMAL) {
1165 /* size = vtable->klass->instance_size; */
1166 mono_mb_emit_ldarg (mb, 0);
1167 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1168 mono_mb_emit_byte (mb, CEE_ADD);
1169 mono_mb_emit_byte (mb, CEE_LDIND_I);
1170 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, instance_size));
1171 mono_mb_emit_byte (mb, CEE_ADD);
1172 /* FIXME: assert instance_size stays a 4 byte integer */
1173 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1174 mono_mb_emit_byte (mb, CEE_CONV_I);
1175 mono_mb_emit_stloc (mb, size_var);
1176 } else if (atype == ATYPE_VECTOR) {
1177 MonoExceptionClause *clause;
1178 int pos, pos_leave, pos_error;
1179 MonoClass *oom_exc_class;
1183 * n > MONO_ARRAY_MAX_INDEX => OutOfMemoryException
1184 * n < 0 => OverflowException
1186 * We can do an unsigned comparison to catch both cases, then in the error
1187 * case compare signed to distinguish between them.
1189 mono_mb_emit_ldarg (mb, 1);
1190 mono_mb_emit_icon (mb, MONO_ARRAY_MAX_INDEX);
1191 mono_mb_emit_byte (mb, CEE_CONV_U);
1192 pos = mono_mb_emit_short_branch (mb, CEE_BLE_UN_S);
1194 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1195 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1196 mono_mb_emit_ldarg (mb, 1);
1197 mono_mb_emit_icon (mb, 0);
1198 pos_error = mono_mb_emit_short_branch (mb, CEE_BLT_S);
1199 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1200 mono_mb_patch_short_branch (mb, pos_error);
1201 mono_mb_emit_exception (mb, "OverflowException", NULL);
1203 mono_mb_patch_short_branch (mb, pos);
1205 clause = (MonoExceptionClause *)mono_image_alloc0 (mono_defaults.corlib, sizeof (MonoExceptionClause));
1206 clause->try_offset = mono_mb_get_label (mb);
1208 /* vtable->klass->sizes.element_size */
1209 mono_mb_emit_ldarg (mb, 0);
1210 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1211 mono_mb_emit_byte (mb, CEE_ADD);
1212 mono_mb_emit_byte (mb, CEE_LDIND_I);
1213 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, sizes));
1214 mono_mb_emit_byte (mb, CEE_ADD);
1215 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1216 mono_mb_emit_byte (mb, CEE_CONV_I);
1219 mono_mb_emit_ldarg (mb, 1);
1220 mono_mb_emit_byte (mb, CEE_MUL_OVF_UN);
1221 /* + sizeof (MonoArray) */
1222 mono_mb_emit_icon (mb, MONO_SIZEOF_MONO_ARRAY);
1223 mono_mb_emit_byte (mb, CEE_ADD_OVF_UN);
1224 mono_mb_emit_stloc (mb, size_var);
1226 pos_leave = mono_mb_emit_branch (mb, CEE_LEAVE);
1229 clause->flags = MONO_EXCEPTION_CLAUSE_NONE;
1230 clause->try_len = mono_mb_get_pos (mb) - clause->try_offset;
1231 clause->data.catch_class = mono_class_load_from_name (mono_defaults.corlib,
1232 "System", "OverflowException");
1233 clause->handler_offset = mono_mb_get_label (mb);
1235 oom_exc_class = mono_class_load_from_name (mono_defaults.corlib,
1236 "System", "OutOfMemoryException");
1237 ctor = mono_class_get_method_from_name (oom_exc_class, ".ctor", 0);
1240 mono_mb_emit_byte (mb, CEE_POP);
1241 mono_mb_emit_op (mb, CEE_NEWOBJ, ctor);
1242 mono_mb_emit_byte (mb, CEE_THROW);
1244 clause->handler_len = mono_mb_get_pos (mb) - clause->handler_offset;
1245 mono_mb_set_clauses (mb, 1, clause);
1246 mono_mb_patch_branch (mb, pos_leave);
1248 } else if (atype == ATYPE_STRING) {
1252 * a string allocator method takes the args: (vtable, len)
1254 * bytes = offsetof (MonoString, chars) + ((len + 1) * 2)
1258 * bytes <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1262 * offsetof (MonoString, chars) + ((len + 1) * 2) <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1263 * len <= (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - offsetof (MonoString, chars)) / 2 - 1
1265 mono_mb_emit_ldarg (mb, 1);
1266 mono_mb_emit_icon (mb, (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - MONO_STRUCT_OFFSET (MonoString, chars)) / 2 - 1);
1267 pos = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
1269 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1270 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1271 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1272 mono_mb_patch_short_branch (mb, pos);
1274 mono_mb_emit_ldarg (mb, 1);
1275 mono_mb_emit_icon (mb, 1);
1276 mono_mb_emit_byte (mb, MONO_CEE_SHL);
1277 //WE manually fold the above + 2 here
1278 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, chars) + 2);
1279 mono_mb_emit_byte (mb, CEE_ADD);
1280 mono_mb_emit_stloc (mb, size_var);
1282 g_assert_not_reached ();
1285 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1286 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1287 mono_mb_emit_byte (mb, CEE_LDC_I4_1);
1288 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1289 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1290 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_NONE);
1293 if (nursery_canaries_enabled ()) {
1294 real_size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1295 mono_mb_emit_ldloc (mb, size_var);
1296 mono_mb_emit_stloc(mb, real_size_var);
1299 real_size_var = size_var;
1301 /* size += ALLOC_ALIGN - 1; */
1302 mono_mb_emit_ldloc (mb, size_var);
1303 mono_mb_emit_icon (mb, SGEN_ALLOC_ALIGN - 1);
1304 mono_mb_emit_byte (mb, CEE_ADD);
1305 /* size &= ~(ALLOC_ALIGN - 1); */
1306 mono_mb_emit_icon (mb, ~(SGEN_ALLOC_ALIGN - 1));
1307 mono_mb_emit_byte (mb, CEE_AND);
1308 mono_mb_emit_stloc (mb, size_var);
1310 /* if (size > MAX_SMALL_OBJ_SIZE) goto slowpath */
1311 if (atype != ATYPE_SMALL) {
1312 mono_mb_emit_ldloc (mb, size_var);
1313 mono_mb_emit_icon (mb, SGEN_MAX_SMALL_OBJ_SIZE);
1314 max_size_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
1318 * We need to modify tlab_next, but the JIT only supports reading, so we read
1319 * another tls var holding its address instead.
1322 /* tlab_next_addr (local) = tlab_next_addr (TLS var) */
1323 tlab_next_addr_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1324 EMIT_TLS_ACCESS_NEXT_ADDR (mb, thread_var);
1325 mono_mb_emit_stloc (mb, tlab_next_addr_var);
1327 /* p = (void**)tlab_next; */
1328 p_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1329 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1330 mono_mb_emit_byte (mb, CEE_LDIND_I);
1331 mono_mb_emit_stloc (mb, p_var);
1333 /* new_next = (char*)p + size; */
1334 new_next_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1335 mono_mb_emit_ldloc (mb, p_var);
1336 mono_mb_emit_ldloc (mb, size_var);
1337 mono_mb_emit_byte (mb, CEE_CONV_I);
1338 mono_mb_emit_byte (mb, CEE_ADD);
1340 if (nursery_canaries_enabled ()) {
1341 mono_mb_emit_icon (mb, CANARY_SIZE);
1342 mono_mb_emit_byte (mb, CEE_ADD);
1344 mono_mb_emit_stloc (mb, new_next_var);
1346 /* if (G_LIKELY (new_next < tlab_temp_end)) */
1347 mono_mb_emit_ldloc (mb, new_next_var);
1348 EMIT_TLS_ACCESS_TEMP_END (mb, thread_var);
1349 fastpath_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
1352 if (atype != ATYPE_SMALL)
1353 mono_mb_patch_short_branch (mb, max_size_branch);
1355 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1356 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1358 * We are no longer in a critical section. We need to do this before calling
1359 * to unmanaged land in order to avoid stw deadlocks since unmanaged code
1362 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1363 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1364 mono_mb_emit_byte (mb, CEE_LDC_I4_0);
1365 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1366 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1367 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_NONE);
1370 /* FIXME: mono_gc_alloc_obj takes a 'size_t' as an argument, not an int32 */
1371 mono_mb_emit_ldarg (mb, 0);
1372 mono_mb_emit_ldloc (mb, real_size_var);
1373 if (atype == ATYPE_NORMAL || atype == ATYPE_SMALL) {
1374 mono_mb_emit_icall (mb, mono_gc_alloc_obj);
1375 } else if (atype == ATYPE_VECTOR) {
1376 mono_mb_emit_ldarg (mb, 1);
1377 mono_mb_emit_icall (mb, mono_gc_alloc_vector);
1378 } else if (atype == ATYPE_STRING) {
1379 mono_mb_emit_ldarg (mb, 1);
1380 mono_mb_emit_icall (mb, mono_gc_alloc_string);
1382 g_assert_not_reached ();
1385 /* if (ret == NULL) throw OOM; */
1386 mono_mb_emit_byte (mb, CEE_DUP);
1387 no_oom_branch = mono_mb_emit_branch (mb, CEE_BRTRUE);
1388 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1390 mono_mb_patch_branch (mb, no_oom_branch);
1391 mono_mb_emit_byte (mb, CEE_RET);
1394 mono_mb_patch_short_branch (mb, fastpath_branch);
1396 /* FIXME: Memory barrier */
1398 /* tlab_next = new_next */
1399 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1400 mono_mb_emit_ldloc (mb, new_next_var);
1401 mono_mb_emit_byte (mb, CEE_STIND_I);
1404 mono_mb_emit_ldloc (mb, p_var);
1405 mono_mb_emit_ldarg (mb, 0);
1406 mono_mb_emit_byte (mb, CEE_STIND_I);
1408 /* mark object end with nursery word */
1409 if (nursery_canaries_enabled ()) {
1410 mono_mb_emit_ldloc (mb, p_var);
1411 mono_mb_emit_ldloc (mb, real_size_var);
1412 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1413 mono_mb_emit_icon8 (mb, (mword) CANARY_STRING);
1414 mono_mb_emit_icon (mb, CANARY_SIZE);
1415 mono_mb_emit_byte (mb, MONO_CEE_PREFIX1);
1416 mono_mb_emit_byte (mb, CEE_CPBLK);
1419 if (atype == ATYPE_VECTOR) {
1420 /* arr->max_length = max_length; */
1421 mono_mb_emit_ldloc (mb, p_var);
1422 mono_mb_emit_ldflda (mb, MONO_STRUCT_OFFSET (MonoArray, max_length));
1423 mono_mb_emit_ldarg (mb, 1);
1424 #ifdef MONO_BIG_ARRAYS
1425 mono_mb_emit_byte (mb, CEE_STIND_I);
1427 mono_mb_emit_byte (mb, CEE_STIND_I4);
1429 } else if (atype == ATYPE_STRING) {
1430 /* need to set length and clear the last char */
1431 /* s->length = len; */
1432 mono_mb_emit_ldloc (mb, p_var);
1433 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, length));
1434 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1435 mono_mb_emit_ldarg (mb, 1);
1436 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
1439 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1440 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1441 mono_mb_emit_byte (mb, CEE_LDC_I4_0);
1442 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1443 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1445 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1446 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1449 We must make sure both vtable and max_length are globaly visible before returning to managed land.
1451 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1454 mono_mb_emit_ldloc (mb, p_var);
1457 mono_mb_emit_byte (mb, CEE_RET);
1460 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
1461 info->d.alloc.gc_name = "sgen";
1462 info->d.alloc.alloc_type = atype;
1464 #ifdef HAVE_ONLINE_VES
1465 mb->init_locals = FALSE;
1468 res = mono_mb_create (mb, csig, 8, info);
1477 mono_gc_get_aligned_size_for_allocator (int size)
1479 return SGEN_ALIGN_UP (size);
1483 * Generate an allocator method implementing the fast path of mono_gc_alloc_obj ().
1484 * The signature of the called method is:
1485 * object allocate (MonoVTable *vtable)
1488 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box, gboolean known_instance_size)
1490 #ifdef MANAGED_ALLOCATION
1491 if (collect_before_allocs)
1493 if (klass->instance_size > tlab_size)
1495 if (known_instance_size && ALIGN_TO (klass->instance_size, SGEN_ALLOC_ALIGN) >= SGEN_MAX_SMALL_OBJ_SIZE)
1497 if (mono_class_has_finalizer (klass) || mono_class_is_marshalbyref (klass))
1501 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1503 if (klass->byval_arg.type == MONO_TYPE_STRING)
1504 return mono_gc_get_managed_allocator_by_type (ATYPE_STRING, MANAGED_ALLOCATOR_REGULAR);
1505 /* Generic classes have dynamic field and can go above MAX_SMALL_OBJ_SIZE. */
1506 if (known_instance_size)
1507 return mono_gc_get_managed_allocator_by_type (ATYPE_SMALL, MANAGED_ALLOCATOR_REGULAR);
1509 return mono_gc_get_managed_allocator_by_type (ATYPE_NORMAL, MANAGED_ALLOCATOR_REGULAR);
1516 mono_gc_get_managed_array_allocator (MonoClass *klass)
1518 #ifdef MANAGED_ALLOCATION
1519 if (klass->rank != 1)
1521 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1523 if (has_per_allocation_action)
1525 g_assert (!mono_class_has_finalizer (klass) && !mono_class_is_marshalbyref (klass));
1527 return mono_gc_get_managed_allocator_by_type (ATYPE_VECTOR, MANAGED_ALLOCATOR_REGULAR);
1534 sgen_set_use_managed_allocator (gboolean flag)
1536 use_managed_allocator = flag;
1540 mono_gc_get_managed_allocator_by_type (int atype, ManagedAllocatorVariant variant)
1542 #ifdef MANAGED_ALLOCATION
1546 if (variant == MANAGED_ALLOCATOR_REGULAR && !use_managed_allocator)
1550 case MANAGED_ALLOCATOR_REGULAR: cache = alloc_method_cache; break;
1551 case MANAGED_ALLOCATOR_SLOW_PATH: cache = slowpath_alloc_method_cache; break;
1552 default: g_assert_not_reached (); break;
1555 res = cache [atype];
1559 res = create_allocator (atype, variant);
1561 if (cache [atype]) {
1562 mono_free_method (res);
1563 res = cache [atype];
1565 mono_memory_barrier ();
1566 cache [atype] = res;
1577 mono_gc_get_managed_allocator_types (void)
1583 sgen_is_managed_allocator (MonoMethod *method)
1587 for (i = 0; i < ATYPE_NUM; ++i)
1588 if (method == alloc_method_cache [i] || method == slowpath_alloc_method_cache [i])
1594 sgen_has_managed_allocator (void)
1598 for (i = 0; i < ATYPE_NUM; ++i)
1599 if (alloc_method_cache [i] || slowpath_alloc_method_cache [i])
1604 #define ARRAY_OBJ_INDEX(ptr,array,elem_size) (((char*)(ptr) - ((char*)(array) + G_STRUCT_OFFSET (MonoArray, vector))) / (elem_size))
1607 sgen_client_cardtable_scan_object (GCObject *obj, guint8 *cards, ScanCopyContext ctx)
1609 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
1610 MonoClass *klass = vt->klass;
1612 SGEN_ASSERT (0, SGEN_VTABLE_HAS_REFERENCES (vt), "Why would we ever call this on reference-free objects?");
1615 MonoArray *arr = (MonoArray*)obj;
1616 guint8 *card_data, *card_base;
1617 guint8 *card_data_end;
1618 char *obj_start = (char *)sgen_card_table_align_pointer (obj);
1620 mword obj_size = sgen_mono_array_size (vt, arr, &bounds_size, sgen_vtable_get_descriptor (vt));
1621 /* We don't want to scan the bounds entries at the end of multidimensional arrays */
1622 char *obj_end = (char*)obj + obj_size - bounds_size;
1624 size_t extra_idx = 0;
1626 mword desc = (mword)klass->element_class->gc_descr;
1627 int elem_size = mono_array_element_size (klass);
1629 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1630 guint8 *overflow_scan_end = NULL;
1633 #ifdef SGEN_OBJECT_LAYOUT_STATISTICS
1634 if (klass->element_class->valuetype)
1635 sgen_object_layout_scanned_vtype_array ();
1637 sgen_object_layout_scanned_ref_array ();
1643 card_data = sgen_card_table_get_card_scan_address ((mword)obj);
1645 card_base = card_data;
1646 card_count = sgen_card_table_number_of_cards_in_range ((mword)obj, obj_size);
1647 card_data_end = card_data + card_count;
1650 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1651 /*Check for overflow and if so, setup to scan in two steps*/
1652 if (!cards && card_data_end >= SGEN_SHADOW_CARDTABLE_END) {
1653 overflow_scan_end = sgen_shadow_cardtable + (card_data_end - SGEN_SHADOW_CARDTABLE_END);
1654 card_data_end = SGEN_SHADOW_CARDTABLE_END;
1660 card_data = sgen_find_next_card (card_data, card_data_end);
1661 for (; card_data < card_data_end; card_data = sgen_find_next_card (card_data + 1, card_data_end)) {
1663 size_t idx = (card_data - card_base) + extra_idx;
1664 char *start = (char*)(obj_start + idx * CARD_SIZE_IN_BYTES);
1665 char *card_end = start + CARD_SIZE_IN_BYTES;
1666 char *first_elem, *elem;
1668 HEAVY_STAT (++los_marked_cards);
1671 sgen_card_table_prepare_card_for_scanning (card_data);
1673 card_end = MIN (card_end, obj_end);
1675 if (start <= (char*)arr->vector)
1678 index = ARRAY_OBJ_INDEX (start, obj, elem_size);
1680 elem = first_elem = (char*)mono_array_addr_with_size_fast ((MonoArray*)obj, elem_size, index);
1681 if (klass->element_class->valuetype) {
1682 ScanVTypeFunc scan_vtype_func = ctx.ops->scan_vtype;
1684 for (; elem < card_end; elem += elem_size)
1685 scan_vtype_func (obj, elem, desc, ctx.queue BINARY_PROTOCOL_ARG (elem_size));
1687 ScanPtrFieldFunc scan_ptr_field_func = ctx.ops->scan_ptr_field;
1689 HEAVY_STAT (++los_array_cards);
1690 for (; elem < card_end; elem += SIZEOF_VOID_P)
1691 scan_ptr_field_func (obj, (GCObject**)elem, ctx.queue);
1694 binary_protocol_card_scan (first_elem, elem - first_elem);
1697 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1698 if (overflow_scan_end) {
1699 extra_idx = card_data - card_base;
1700 card_base = card_data = sgen_shadow_cardtable;
1701 card_data_end = overflow_scan_end;
1702 overflow_scan_end = NULL;
1713 * Array and string allocation
1717 mono_gc_alloc_vector (MonoVTable *vtable, size_t size, uintptr_t max_length)
1722 if (!SGEN_CAN_ALIGN_UP (size))
1725 #ifndef DISABLE_CRITICAL_REGION
1726 ENTER_CRITICAL_REGION;
1727 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1729 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1730 arr->max_length = (mono_array_size_t)max_length;
1731 EXIT_CRITICAL_REGION;
1734 EXIT_CRITICAL_REGION;
1739 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1740 if (G_UNLIKELY (!arr)) {
1745 arr->max_length = (mono_array_size_t)max_length;
1750 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1751 mono_profiler_allocation (&arr->obj);
1753 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Vector has incorrect size.");
1758 mono_gc_alloc_array (MonoVTable *vtable, size_t size, uintptr_t max_length, uintptr_t bounds_size)
1761 MonoArrayBounds *bounds;
1764 if (!SGEN_CAN_ALIGN_UP (size))
1767 #ifndef DISABLE_CRITICAL_REGION
1768 ENTER_CRITICAL_REGION;
1769 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1771 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1772 arr->max_length = (mono_array_size_t)max_length;
1774 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1775 arr->bounds = bounds;
1776 EXIT_CRITICAL_REGION;
1779 EXIT_CRITICAL_REGION;
1784 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1785 if (G_UNLIKELY (!arr)) {
1790 arr->max_length = (mono_array_size_t)max_length;
1792 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1793 arr->bounds = bounds;
1798 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1799 mono_profiler_allocation (&arr->obj);
1801 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Array has incorrect size.");
1806 mono_gc_alloc_string (MonoVTable *vtable, size_t size, gint32 len)
1811 if (!SGEN_CAN_ALIGN_UP (size))
1814 #ifndef DISABLE_CRITICAL_REGION
1815 ENTER_CRITICAL_REGION;
1816 str = (MonoString*)sgen_try_alloc_obj_nolock (vtable, size);
1818 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1820 EXIT_CRITICAL_REGION;
1823 EXIT_CRITICAL_REGION;
1828 str = (MonoString*)sgen_alloc_obj_nolock (vtable, size);
1829 if (G_UNLIKELY (!str)) {
1839 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1840 mono_profiler_allocation (&str->object);
1850 mono_gc_set_string_length (MonoString *str, gint32 new_length)
1852 mono_unichar2 *new_end = str->chars + new_length;
1854 /* zero the discarded string. This null-delimits the string and allows
1855 * the space to be reclaimed by SGen. */
1857 if (nursery_canaries_enabled () && sgen_ptr_in_nursery (str)) {
1858 CHECK_CANARY_FOR_OBJECT ((GCObject*)str, TRUE);
1859 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2) + CANARY_SIZE);
1860 memcpy (new_end + 1 , CANARY_STRING, CANARY_SIZE);
1862 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2));
1865 str->length = new_length;
1872 #define GC_ROOT_NUM 32
1874 int count; /* must be the first field */
1875 void *objects [GC_ROOT_NUM];
1876 int root_types [GC_ROOT_NUM];
1877 uintptr_t extra_info [GC_ROOT_NUM];
1881 notify_gc_roots (GCRootReport *report)
1885 mono_profiler_gc_roots (report->count, report->objects, report->root_types, report->extra_info);
1890 add_profile_gc_root (GCRootReport *report, void *object, int rtype, uintptr_t extra_info)
1892 if (report->count == GC_ROOT_NUM)
1893 notify_gc_roots (report);
1894 report->objects [report->count] = object;
1895 report->root_types [report->count] = rtype;
1896 report->extra_info [report->count++] = (uintptr_t)SGEN_LOAD_VTABLE (object)->klass;
1900 sgen_client_nursery_objects_pinned (void **definitely_pinned, int count)
1902 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS) {
1903 GCRootReport report;
1906 for (idx = 0; idx < count; ++idx)
1907 add_profile_gc_root (&report, definitely_pinned [idx], MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
1908 notify_gc_roots (&report);
1913 report_finalizer_roots_from_queue (SgenPointerQueue *queue)
1915 GCRootReport report;
1919 for (i = 0; i < queue->next_slot; ++i) {
1920 void *obj = queue->data [i];
1923 add_profile_gc_root (&report, obj, MONO_PROFILE_GC_ROOT_FINALIZER, 0);
1925 notify_gc_roots (&report);
1929 report_finalizer_roots (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
1931 report_finalizer_roots_from_queue (fin_ready_queue);
1932 report_finalizer_roots_from_queue (critical_fin_queue);
1935 static GCRootReport *root_report;
1938 single_arg_report_root (MonoObject **obj, void *gc_data)
1941 add_profile_gc_root (root_report, *obj, MONO_PROFILE_GC_ROOT_OTHER, 0);
1945 precisely_report_roots_from (GCRootReport *report, void** start_root, void** end_root, mword desc)
1947 switch (desc & ROOT_DESC_TYPE_MASK) {
1948 case ROOT_DESC_BITMAP:
1949 desc >>= ROOT_DESC_TYPE_SHIFT;
1951 if ((desc & 1) && *start_root) {
1952 add_profile_gc_root (report, *start_root, MONO_PROFILE_GC_ROOT_OTHER, 0);
1958 case ROOT_DESC_COMPLEX: {
1959 gsize *bitmap_data = (gsize *)sgen_get_complex_descriptor_bitmap (desc);
1960 gsize bwords = (*bitmap_data) - 1;
1961 void **start_run = start_root;
1963 while (bwords-- > 0) {
1964 gsize bmap = *bitmap_data++;
1965 void **objptr = start_run;
1967 if ((bmap & 1) && *objptr) {
1968 add_profile_gc_root (report, *objptr, MONO_PROFILE_GC_ROOT_OTHER, 0);
1973 start_run += GC_BITS_PER_WORD;
1977 case ROOT_DESC_VECTOR: {
1980 for (p = start_root; p < end_root; p++) {
1982 add_profile_gc_root (report, *p, MONO_PROFILE_GC_ROOT_OTHER, 0);
1986 case ROOT_DESC_USER: {
1987 MonoGCRootMarkFunc marker = (MonoGCRootMarkFunc)sgen_get_user_descriptor_func (desc);
1988 root_report = report;
1989 marker ((MonoObject**)start_root, single_arg_report_root, NULL);
1992 case ROOT_DESC_RUN_LEN:
1993 g_assert_not_reached ();
1995 g_assert_not_reached ();
2000 report_registered_roots_by_type (int root_type)
2002 GCRootReport report;
2006 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], void **, start_root, RootRecord *, root) {
2007 SGEN_LOG (6, "Precise root scan %p-%p (desc: %p)", start_root, root->end_root, (void*)root->root_desc);
2008 precisely_report_roots_from (&report, start_root, (void**)root->end_root, root->root_desc);
2009 } SGEN_HASH_TABLE_FOREACH_END;
2010 notify_gc_roots (&report);
2014 report_registered_roots (void)
2016 report_registered_roots_by_type (ROOT_TYPE_NORMAL);
2017 report_registered_roots_by_type (ROOT_TYPE_WBARRIER);
2021 sgen_client_collecting_minor (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2023 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2024 report_registered_roots ();
2025 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2026 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2029 static GCRootReport major_root_report;
2030 static gboolean profile_roots;
2033 sgen_client_collecting_major_1 (void)
2035 profile_roots = mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS;
2036 memset (&major_root_report, 0, sizeof (GCRootReport));
2040 sgen_client_pinned_los_object (GCObject *obj)
2043 add_profile_gc_root (&major_root_report, (char*)obj, MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
2047 sgen_client_collecting_major_2 (void)
2050 notify_gc_roots (&major_root_report);
2052 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2053 report_registered_roots ();
2057 sgen_client_collecting_major_3 (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2059 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2060 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2063 #define MOVED_OBJECTS_NUM 64
2064 static void *moved_objects [MOVED_OBJECTS_NUM];
2065 static int moved_objects_idx = 0;
2067 static SgenPointerQueue moved_objects_queue = SGEN_POINTER_QUEUE_INIT (INTERNAL_MEM_MOVED_OBJECT);
2070 mono_sgen_register_moved_object (void *obj, void *destination)
2073 * This function can be called from SGen's worker threads. We want to try
2074 * and avoid exposing those threads to the profiler API, so queue up move
2075 * events and send them later when the main GC thread calls
2076 * mono_sgen_gc_event_moves ().
2078 * TODO: Once SGen has multiple worker threads, we need to switch to a
2079 * lock-free data structure for the queue as multiple threads will be
2080 * adding to it at the same time.
2082 if (sgen_workers_is_worker_thread (mono_native_thread_id_get ())) {
2083 sgen_pointer_queue_add (&moved_objects_queue, obj);
2084 sgen_pointer_queue_add (&moved_objects_queue, destination);
2086 if (moved_objects_idx == MOVED_OBJECTS_NUM) {
2087 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2088 moved_objects_idx = 0;
2091 moved_objects [moved_objects_idx++] = obj;
2092 moved_objects [moved_objects_idx++] = destination;
2097 mono_sgen_gc_event_moves (void)
2099 while (!sgen_pointer_queue_is_empty (&moved_objects_queue)) {
2100 void *dst = sgen_pointer_queue_pop (&moved_objects_queue);
2101 void *src = sgen_pointer_queue_pop (&moved_objects_queue);
2103 mono_sgen_register_moved_object (src, dst);
2106 if (moved_objects_idx) {
2107 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2108 moved_objects_idx = 0;
2116 #define REFS_SIZE 128
2119 MonoGCReferences callback;
2123 MonoObject *refs [REFS_SIZE];
2124 uintptr_t offsets [REFS_SIZE];
2128 #define HANDLE_PTR(ptr,obj) do { \
2130 if (hwi->count == REFS_SIZE) { \
2131 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data); \
2135 hwi->offsets [hwi->count] = (char*)(ptr)-(char*)start; \
2136 hwi->refs [hwi->count++] = *(ptr); \
2141 collect_references (HeapWalkInfo *hwi, GCObject *obj, size_t size)
2143 char *start = (char*)obj;
2144 mword desc = sgen_obj_get_descriptor (obj);
2146 #include "sgen/sgen-scan-object.h"
2150 walk_references (GCObject *start, size_t size, void *data)
2152 HeapWalkInfo *hwi = (HeapWalkInfo *)data;
2155 collect_references (hwi, start, size);
2156 if (hwi->count || !hwi->called)
2157 hwi->callback (start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data);
2161 * mono_gc_walk_heap:
2162 * \param flags flags for future use
2163 * \param callback a function pointer called for each object in the heap
2164 * \param data a user data pointer that is passed to callback
2165 * This function can be used to iterate over all the live objects in the heap;
2166 * for each object, \p callback is invoked, providing info about the object's
2167 * location in memory, its class, its size and the objects it references.
2168 * For each referenced object its offset from the object address is
2169 * reported in the offsets array.
2170 * The object references may be buffered, so the callback may be invoked
2171 * multiple times for the same object: in all but the first call, the size
2172 * argument will be zero.
2173 * Note that this function can be only called in the \c MONO_GC_EVENT_PRE_START_WORLD
2174 * profiler event handler.
2175 * \returns a non-zero value if the GC doesn't support heap walking
2178 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
2183 hwi.callback = callback;
2186 sgen_clear_nursery_fragments ();
2187 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data, walk_references, &hwi, FALSE, TRUE);
2189 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, walk_references, &hwi);
2190 sgen_los_iterate_objects (walk_references, &hwi);
2200 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
2202 gc_callbacks = *callbacks;
2206 mono_gc_get_gc_callbacks ()
2208 return &gc_callbacks;
2212 sgen_client_thread_register (SgenThreadInfo* info, void *stack_bottom_fallback)
2215 guint8 *staddr = NULL;
2217 mono_tls_set_sgen_thread_info (info);
2219 info->client_info.skip = 0;
2221 info->client_info.stack_start = NULL;
2223 #ifdef SGEN_POSIX_STW
2224 info->client_info.stop_count = -1;
2225 info->client_info.signal = 0;
2228 mono_thread_info_get_stack_bounds (&staddr, &stsize);
2230 info->client_info.stack_start_limit = staddr;
2231 info->client_info.stack_end = staddr + stsize;
2233 gsize stack_bottom = (gsize)stack_bottom_fallback;
2234 stack_bottom += 4095;
2235 stack_bottom &= ~4095;
2236 info->client_info.stack_end = (char*)stack_bottom;
2239 memset (&info->client_info.ctx, 0, sizeof (MonoContext));
2241 if (mono_gc_get_gc_callbacks ()->thread_attach_func)
2242 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2244 binary_protocol_thread_register ((gpointer)mono_thread_info_get_tid (info));
2246 SGEN_LOG (3, "registered thread %p (%p) stack end %p", info, (gpointer)mono_thread_info_get_tid (info), info->client_info.stack_end);
2248 info->client_info.info.handle_stack = mono_handle_stack_alloc ();
2252 sgen_client_thread_unregister (SgenThreadInfo *p)
2254 MonoNativeThreadId tid;
2256 mono_tls_set_sgen_thread_info (NULL);
2258 tid = mono_thread_info_get_tid (p);
2260 if (p->client_info.info.runtime_thread)
2261 mono_threads_add_joinable_thread ((gpointer)tid);
2263 if (mono_gc_get_gc_callbacks ()->thread_detach_func) {
2264 mono_gc_get_gc_callbacks ()->thread_detach_func (p->client_info.runtime_data);
2265 p->client_info.runtime_data = NULL;
2268 binary_protocol_thread_unregister ((gpointer)tid);
2269 SGEN_LOG (3, "unregister thread %p (%p)", p, (gpointer)tid);
2271 HandleStack *handles = (HandleStack*) p->client_info.info.handle_stack;
2272 p->client_info.info.handle_stack = NULL;
2273 mono_handle_stack_free (handles);
2277 mono_gc_set_skip_thread (gboolean skip)
2279 SgenThreadInfo *info = mono_thread_info_current ();
2282 info->client_info.gc_disabled = skip;
2286 /* If we skip scanning a thread with a non-empty handle stack, we may move an
2287 * object but fail to update the reference in the handle.
2289 HandleStack *stack = info->client_info.info.handle_stack;
2290 g_assert (stack == NULL || mono_handle_stack_is_empty (stack));
2295 thread_in_critical_region (SgenThreadInfo *info)
2297 return info->client_info.in_critical_region;
2301 sgen_thread_attach (SgenThreadInfo *info)
2303 if (mono_gc_get_gc_callbacks ()->thread_attach_func && !info->client_info.runtime_data)
2304 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2308 sgen_thread_detach (SgenThreadInfo *p)
2310 /* If a delegate is passed to native code and invoked on a thread we dont
2311 * know about, marshal will register it with mono_threads_attach_coop, but
2312 * we have no way of knowing when that thread goes away. SGen has a TSD
2313 * so we assume that if the domain is still registered, we can detach
2316 if (mono_thread_internal_current_is_attached ())
2317 mono_thread_detach_internal (mono_thread_internal_current ());
2321 * mono_gc_register_thread:
2324 mono_gc_register_thread (void *baseptr)
2326 return mono_thread_info_attach (baseptr) != NULL;
2330 * mono_gc_is_gc_thread:
2333 mono_gc_is_gc_thread (void)
2337 result = mono_thread_info_current () != NULL;
2343 sgen_client_thread_register_worker (void)
2345 mono_thread_info_register_small_id ();
2346 mono_native_thread_set_name (mono_native_thread_id_get (), "SGen worker");
2349 /* Variables holding start/end nursery so it won't have to be passed at every call */
2350 static void *scan_area_arg_start, *scan_area_arg_end;
2353 mono_gc_conservatively_scan_area (void *start, void *end)
2355 sgen_conservatively_pin_objects_from ((void **)start, (void **)end, scan_area_arg_start, scan_area_arg_end, PIN_TYPE_STACK);
2359 mono_gc_scan_object (void *obj, void *gc_data)
2361 ScanCopyContext *ctx = (ScanCopyContext *)gc_data;
2362 ctx->ops->copy_or_mark_object ((GCObject**)&obj, ctx->queue);
2367 void **start_nursery;
2369 } PinHandleStackInteriorPtrData;
2371 /* Called when we're scanning the handle stack imprecisely and we encounter a pointer into the
2372 middle of an object.
2375 pin_handle_stack_interior_ptrs (void **ptr_slot, void *user_data)
2377 PinHandleStackInteriorPtrData *ud = (PinHandleStackInteriorPtrData *)user_data;
2378 sgen_conservatively_pin_objects_from (ptr_slot, ptr_slot+1, ud->start_nursery, ud->end_nursery, PIN_TYPE_STACK);
2383 * Mark from thread stacks and registers.
2386 sgen_client_scan_thread_data (void *start_nursery, void *end_nursery, gboolean precise, ScanCopyContext ctx)
2388 scan_area_arg_start = start_nursery;
2389 scan_area_arg_end = end_nursery;
2391 FOREACH_THREAD (info) {
2392 int skip_reason = 0;
2393 void *aligned_stack_start;
2395 if (info->client_info.skip) {
2396 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);
2398 } else if (info->client_info.gc_disabled) {
2399 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);
2401 } else if (!mono_thread_info_is_live (info)) {
2402 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);
2404 } else if (!info->client_info.stack_start) {
2405 SGEN_LOG (3, "Skipping starting or detaching thread %p", info);
2409 binary_protocol_scan_stack ((gpointer)mono_thread_info_get_tid (info), info->client_info.stack_start, info->client_info.stack_end, skip_reason);
2413 /* If we skip a thread with a non-empty handle stack and then it
2414 * resumes running we may potentially move an object but fail to
2415 * update the reference in the handle.
2417 HandleStack *stack = info->client_info.info.handle_stack;
2418 g_assert (stack == NULL || mono_handle_stack_is_empty (stack));
2423 g_assert (info->client_info.stack_start);
2424 g_assert (info->client_info.stack_end);
2426 aligned_stack_start = (void*)(mword) ALIGN_TO ((mword)info->client_info.stack_start, SIZEOF_VOID_P);
2428 /* Windows uses a guard page before the committed stack memory pages to detect when the
2429 stack needs to be grown. If we suspend a thread just after a function prolog has
2430 decremented the stack pointer to point into the guard page but before the thread has
2431 been able to read or write to that page, starting the stack scan at aligned_stack_start
2432 will raise a STATUS_GUARD_PAGE_VIOLATION and the process will crash. This code uses
2433 VirtualQuery() to determine whether stack_start points into the guard page and then
2434 updates aligned_stack_start to point at the next non-guard page. */
2435 MEMORY_BASIC_INFORMATION mem_info;
2436 SIZE_T result = VirtualQuery(info->client_info.stack_start, &mem_info, sizeof(mem_info));
2437 g_assert (result != 0);
2438 if (mem_info.Protect & PAGE_GUARD) {
2439 aligned_stack_start = ((char*) mem_info.BaseAddress) + mem_info.RegionSize;
2443 g_assert (info->client_info.suspend_done);
2444 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 ());
2445 if (mono_gc_get_gc_callbacks ()->thread_mark_func && !conservative_stack_mark) {
2446 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);
2447 } else if (!precise) {
2448 if (!conservative_stack_mark) {
2449 fprintf (stderr, "Precise stack mark not supported - disabling.\n");
2450 conservative_stack_mark = TRUE;
2452 //FIXME we should eventually use the new stack_mark from coop
2453 sgen_conservatively_pin_objects_from ((void **)aligned_stack_start, (void **)info->client_info.stack_end, start_nursery, end_nursery, PIN_TYPE_STACK);
2457 sgen_conservatively_pin_objects_from ((void**)&info->client_info.ctx, (void**)(&info->client_info.ctx + 1),
2458 start_nursery, end_nursery, PIN_TYPE_STACK);
2461 // This is used on Coop GC for platforms where we cannot get the data for individual registers.
2462 // We force a spill of all registers into the stack and pass a chunk of data into sgen.
2463 //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
2464 MonoThreadUnwindState *state = &info->client_info.info.thread_saved_state [SELF_SUSPEND_STATE_INDEX];
2465 if (state && state->gc_stackdata) {
2466 sgen_conservatively_pin_objects_from ((void **)state->gc_stackdata, (void**)((char*)state->gc_stackdata + state->gc_stackdata_size),
2467 start_nursery, end_nursery, PIN_TYPE_STACK);
2471 if (info->client_info.info.handle_stack) {
2473 Make two passes over the handle stack. On the imprecise pass, pin all
2474 objects where the handle points into the interior of the object. On the
2475 precise pass, copy or mark all the objects that have handles to the
2476 beginning of the object.
2479 mono_handle_stack_scan ((HandleStack*)info->client_info.info.handle_stack, (GcScanFunc)ctx.ops->copy_or_mark_object, ctx.queue, precise);
2481 PinHandleStackInteriorPtrData ud = { .start_nursery = start_nursery,
2482 .end_nursery = end_nursery,
2484 mono_handle_stack_scan ((HandleStack*)info->client_info.info.handle_stack, pin_handle_stack_interior_ptrs, &ud, precise);
2487 } FOREACH_THREAD_END
2491 * mono_gc_set_stack_end:
2493 * Set the end of the current threads stack to STACK_END. The stack space between
2494 * STACK_END and the real end of the threads stack will not be scanned during collections.
2497 mono_gc_set_stack_end (void *stack_end)
2499 SgenThreadInfo *info;
2502 info = mono_thread_info_current ();
2504 SGEN_ASSERT (0, stack_end < info->client_info.stack_end, "Can only lower stack end");
2505 info->client_info.stack_end = stack_end;
2515 mono_gc_register_root (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2517 return sgen_register_root (start, size, descr, descr ? ROOT_TYPE_NORMAL : ROOT_TYPE_PINNED, source, msg);
2521 mono_gc_register_root_wbarrier (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2523 return sgen_register_root (start, size, descr, ROOT_TYPE_WBARRIER, source, msg);
2527 mono_gc_deregister_root (char* addr)
2529 sgen_deregister_root (addr);
2538 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
2542 mono_threads_join_lock ();
2543 res = pthread_create (new_thread, attr, start_routine, arg);
2544 mono_threads_join_unlock ();
2555 sgen_client_total_allocated_heap_changed (size_t allocated_heap)
2557 mono_runtime_resource_check_limit (MONO_RESOURCE_GC_HEAP, allocated_heap);
2561 mono_gc_user_markers_supported (void)
2567 mono_object_is_alive (MonoObject* o)
2573 mono_gc_get_generation (MonoObject *obj)
2575 if (sgen_ptr_in_nursery (obj))
2581 mono_gc_get_gc_name (void)
2587 mono_gc_get_description (void)
2589 #ifdef HAVE_CONC_GC_AS_DEFAULT
2590 return g_strdup ("sgen (concurrent by default)");
2592 return g_strdup ("sgen");
2597 mono_gc_set_desktop_mode (void)
2602 mono_gc_is_moving (void)
2608 mono_gc_is_disabled (void)
2614 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
2621 mono_gc_max_generation (void)
2627 mono_gc_precise_stack_mark_enabled (void)
2629 return !conservative_stack_mark;
2633 mono_gc_collect (int generation)
2635 sgen_gc_collect (generation);
2639 mono_gc_collection_count (int generation)
2641 return sgen_gc_collection_count (generation);
2645 mono_gc_get_used_size (void)
2647 return (int64_t)sgen_gc_get_used_size ();
2651 mono_gc_get_heap_size (void)
2653 return (int64_t)sgen_gc_get_total_heap_allocation ();
2657 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
2659 return sgen_make_user_root_descriptor (marker);
2663 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
2665 return SGEN_DESC_STRING;
2669 mono_gc_get_nursery (int *shift_bits, size_t *size)
2671 *size = sgen_nursery_size;
2672 *shift_bits = sgen_nursery_bits;
2673 return sgen_get_nursery_start ();
2677 mono_gc_get_los_limit (void)
2679 return SGEN_MAX_SMALL_OBJ_SIZE;
2683 sgen_client_default_metadata (void)
2685 return mono_domain_get ();
2689 sgen_client_metadata_for_object (GCObject *obj)
2691 return mono_object_domain (obj);
2695 * mono_gchandle_is_in_domain:
2696 * \param gchandle a GCHandle's handle.
2697 * \param domain An application domain.
2698 * \returns TRUE if the object wrapped by the \p gchandle belongs to the specific \p domain.
2701 mono_gchandle_is_in_domain (guint32 gchandle, MonoDomain *domain)
2703 MonoDomain *gchandle_domain = (MonoDomain *)sgen_gchandle_get_metadata (gchandle);
2704 return domain->domain_id == gchandle_domain->domain_id;
2708 * mono_gchandle_free_domain:
2709 * \param unloading domain that is unloading
2711 * Function used internally to cleanup any GC handle for objects belonging
2712 * to the specified domain during appdomain unload.
2715 mono_gchandle_free_domain (MonoDomain *unloading)
2720 null_link_if_in_domain (gpointer hidden, GCHandleType handle_type, int max_generation, gpointer user)
2722 MonoDomain *unloading_domain = (MonoDomain *)user;
2723 MonoDomain *obj_domain;
2724 gboolean is_weak = MONO_GC_HANDLE_TYPE_IS_WEAK (handle_type);
2725 if (MONO_GC_HANDLE_IS_OBJECT_POINTER (hidden)) {
2726 MonoObject *obj = (MonoObject *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2727 obj_domain = mono_object_domain (obj);
2729 obj_domain = (MonoDomain *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2731 if (unloading_domain->domain_id == obj_domain->domain_id)
2737 sgen_null_links_for_domain (MonoDomain *domain)
2740 for (type = HANDLE_TYPE_MIN; type < HANDLE_TYPE_MAX; ++type)
2741 sgen_gchandle_iterate ((GCHandleType)type, GENERATION_OLD, null_link_if_in_domain, domain);
2745 mono_gchandle_set_target (guint32 gchandle, MonoObject *obj)
2747 sgen_gchandle_set_target (gchandle, obj);
2751 sgen_client_gchandle_created (int handle_type, GCObject *obj, guint32 handle)
2753 #ifndef DISABLE_PERFCOUNTERS
2754 mono_perfcounters->gc_num_handles++;
2756 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_CREATED, handle_type, handle, obj);
2760 sgen_client_gchandle_destroyed (int handle_type, guint32 handle)
2762 #ifndef DISABLE_PERFCOUNTERS
2763 mono_perfcounters->gc_num_handles--;
2765 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_DESTROYED, handle_type, handle, NULL);
2769 sgen_client_ensure_weak_gchandles_accessible (void)
2772 * During the second bridge processing step the world is
2773 * running again. That step processes all weak links once
2774 * more to null those that refer to dead objects. Before that
2775 * is completed, those links must not be followed, so we
2776 * conservatively wait for bridge processing when any weak
2777 * link is dereferenced.
2779 /* FIXME: A GC can occur after this check fails, in which case we
2780 * should wait for bridge processing but would fail to do so.
2782 if (G_UNLIKELY (bridge_processing_in_progress))
2783 mono_gc_wait_for_bridge_processing ();
2787 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
2791 result = func (data);
2792 UNLOCK_INTERRUPTION;
2797 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
2803 mono_gc_get_card_table (int *shift_bits, gpointer *mask)
2805 return sgen_get_card_table_configuration (shift_bits, mask);
2809 mono_gc_card_table_nursery_check (void)
2811 return !sgen_get_major_collector ()->is_concurrent;
2814 /* Negative value to remove */
2816 mono_gc_add_memory_pressure (gint64 value)
2818 /* FIXME: Implement at some point? */
2826 sgen_client_degraded_allocation (size_t size)
2828 static int last_major_gc_warned = -1;
2829 static int num_degraded = 0;
2831 if (last_major_gc_warned < (int)gc_stats.major_gc_count) {
2833 if (num_degraded == 1 || num_degraded == 3)
2834 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Degraded allocation. Consider increasing nursery-size if the warning persists.");
2835 else if (num_degraded == 10)
2836 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Repeated degraded allocation. Consider increasing nursery-size.");
2837 last_major_gc_warned = gc_stats.major_gc_count;
2846 sgen_client_description_for_internal_mem_type (int type)
2849 case INTERNAL_MEM_EPHEMERON_LINK: return "ephemeron-link";
2850 case INTERNAL_MEM_MOVED_OBJECT: return "moved-object";
2857 sgen_client_pre_collection_checks (void)
2859 if (sgen_mono_xdomain_checks) {
2860 sgen_clear_nursery_fragments ();
2861 sgen_check_for_xdomain_refs ();
2866 sgen_client_vtable_is_inited (MonoVTable *vt)
2868 return vt->klass->inited;
2872 sgen_client_vtable_get_namespace (MonoVTable *vt)
2874 return vt->klass->name_space;
2878 sgen_client_vtable_get_name (MonoVTable *vt)
2880 return vt->klass->name;
2888 sgen_client_init (void)
2891 MonoThreadInfoCallbacks cb;
2893 cb.thread_register = sgen_thread_register;
2894 cb.thread_detach = sgen_thread_detach;
2895 cb.thread_unregister = sgen_thread_unregister;
2896 cb.thread_attach = sgen_thread_attach;
2897 cb.mono_thread_in_critical_region = thread_in_critical_region;
2898 cb.ip_in_critical_region = ip_in_critical_region;
2900 mono_threads_init (&cb, sizeof (SgenThreadInfo));
2902 ///* Keep this the default for now */
2903 /* Precise marking is broken on all supported targets. Disable until fixed. */
2904 conservative_stack_mark = TRUE;
2906 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_EPHEMERON_LINK, sizeof (EphemeronLinkNode));
2908 mono_sgen_init_stw ();
2910 mono_tls_init_gc_keys ();
2912 mono_gc_register_thread (&dummy);
2916 sgen_client_handle_gc_param (const char *opt)
2918 if (g_str_has_prefix (opt, "stack-mark=")) {
2919 opt = strchr (opt, '=') + 1;
2920 if (!strcmp (opt, "precise")) {
2921 conservative_stack_mark = FALSE;
2922 } else if (!strcmp (opt, "conservative")) {
2923 conservative_stack_mark = TRUE;
2925 sgen_env_var_error (MONO_GC_PARAMS_NAME, conservative_stack_mark ? "Using `conservative`." : "Using `precise`.",
2926 "Invalid value `%s` for `stack-mark` option, possible values are: `precise`, `conservative`.", opt);
2928 } else if (g_str_has_prefix (opt, "bridge-implementation=")) {
2929 opt = strchr (opt, '=') + 1;
2930 sgen_set_bridge_implementation (opt);
2931 } else if (g_str_has_prefix (opt, "toggleref-test")) {
2932 /* FIXME: This should probably in MONO_GC_DEBUG */
2933 sgen_register_test_toggleref_callback ();
2934 } else if (!sgen_bridge_handle_gc_param (opt)) {
2941 sgen_client_print_gc_params_usage (void)
2943 fprintf (stderr, " stack-mark=MARK-METHOD (where MARK-METHOD is 'precise' or 'conservative')\n");
2947 sgen_client_handle_gc_debug (const char *opt)
2949 if (!strcmp (opt, "xdomain-checks")) {
2950 sgen_mono_xdomain_checks = TRUE;
2951 } else if (!strcmp (opt, "do-not-finalize")) {
2952 mono_do_not_finalize = TRUE;
2953 } else if (g_str_has_prefix (opt, "do-not-finalize=")) {
2954 opt = strchr (opt, '=') + 1;
2955 mono_do_not_finalize = TRUE;
2956 mono_do_not_finalize_class_names = g_strsplit (opt, ",", 0);
2957 } else if (!strcmp (opt, "log-finalizers")) {
2958 log_finalizers = TRUE;
2959 } else if (!strcmp (opt, "no-managed-allocator")) {
2960 sgen_set_use_managed_allocator (FALSE);
2961 } else if (!sgen_bridge_handle_gc_debug (opt)) {
2968 sgen_client_print_gc_debug_usage (void)
2970 fprintf (stderr, " xdomain-checks\n");
2971 fprintf (stderr, " do-not-finalize\n");
2972 fprintf (stderr, " log-finalizers\n");
2973 fprintf (stderr, " no-managed-allocator\n");
2974 sgen_bridge_print_gc_debug_usage ();
2979 sgen_client_get_provenance (void)
2981 #ifdef SGEN_OBJECT_PROVENANCE
2982 MonoGCCallbacks *cb = mono_gc_get_gc_callbacks ();
2983 gpointer (*get_provenance_func) (void);
2986 get_provenance_func = cb->get_provenance_func;
2987 if (get_provenance_func)
2988 return get_provenance_func ();
2996 sgen_client_describe_invalid_pointer (GCObject *ptr)
2998 sgen_bridge_describe_pointer (ptr);
3001 static gboolean gc_inited;
3004 * mono_gc_base_init:
3007 mono_gc_base_init (void)
3012 mono_counters_init ();
3015 mono_w32handle_init ();
3018 #ifdef HEAVY_STATISTICS
3019 mono_counters_register ("los marked cards", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_marked_cards);
3020 mono_counters_register ("los array cards scanned ", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_cards);
3021 mono_counters_register ("los array remsets", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_remsets);
3023 mono_counters_register ("WBarrier set arrayref", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_set_arrayref);
3024 mono_counters_register ("WBarrier value copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_value_copy);
3025 mono_counters_register ("WBarrier object copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_object_copy);
3034 mono_gc_base_cleanup (void)
3036 sgen_thread_pool_shutdown (major_collector.get_sweep_pool ());
3038 sgen_workers_shutdown ();
3040 // We should have consumed any outstanding moves.
3041 g_assert (sgen_pointer_queue_is_empty (&moved_objects_queue));
3045 mono_gc_is_null (void)