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"
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;
54 __thread SgenThreadInfo *sgen_thread_info;
56 MonoNativeTlsKey thread_info_key;
59 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
61 #define OPDEF(a,b,c,d,e,f,g,h,i,j) \
65 #include "mono/cil/opcode.def"
76 ptr_on_stack (void *ptr)
78 gpointer stack_start = &stack_start;
79 SgenThreadInfo *info = mono_thread_info_current ();
81 if (ptr >= stack_start && ptr < (gpointer)info->client_info.stack_end)
86 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
88 #define HANDLE_PTR(ptr,obj) do { \
89 gpointer o = *(gpointer*)(ptr); \
91 gpointer d = ((char*)dest) + ((char*)(ptr) - (char*)(obj)); \
92 binary_protocol_wbarrier (d, o, (gpointer) SGEN_LOAD_VTABLE (o)); \
97 scan_object_for_binary_protocol_copy_wbarrier (gpointer dest, char *start, mword desc)
99 #define SCAN_OBJECT_NOVTABLE
100 #include "sgen/sgen-scan-object.h"
105 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
107 HEAVY_STAT (++stat_wbarrier_value_copy);
108 g_assert (klass->valuetype);
110 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);
112 if (sgen_ptr_in_nursery (dest) || ptr_on_stack (dest) || !sgen_gc_descr_has_references ((mword)klass->gc_descr)) {
113 size_t element_size = mono_class_value_size (klass, NULL);
114 size_t size = count * element_size;
115 mono_gc_memmove_atomic (dest, src, size);
119 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
120 if (binary_protocol_is_heavy_enabled ()) {
121 size_t element_size = mono_class_value_size (klass, NULL);
123 for (i = 0; i < count; ++i) {
124 scan_object_for_binary_protocol_copy_wbarrier ((char*)dest + i * element_size,
125 (char*)src + i * element_size - sizeof (MonoObject),
126 (mword) klass->gc_descr);
131 sgen_get_remset ()->wbarrier_value_copy (dest, src, count, mono_class_value_size (klass, NULL));
135 * mono_gc_wbarrier_object_copy:
137 * Write barrier to call when obj is the result of a clone or copy of an object.
140 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
144 HEAVY_STAT (++stat_wbarrier_object_copy);
146 SGEN_ASSERT (6, !ptr_on_stack (obj), "Why is this called for a non-reference type?");
147 if (sgen_ptr_in_nursery (obj) || !SGEN_OBJECT_HAS_REFERENCES (src)) {
148 size = mono_object_class (obj)->instance_size;
149 mono_gc_memmove_aligned ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
150 size - sizeof (MonoObject));
154 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
155 if (binary_protocol_is_heavy_enabled ())
156 scan_object_for_binary_protocol_copy_wbarrier (obj, (char*)src, (mword) src->vtable->gc_descr);
159 sgen_get_remset ()->wbarrier_object_copy (obj, src);
163 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
165 HEAVY_STAT (++stat_wbarrier_set_arrayref);
166 if (sgen_ptr_in_nursery (slot_ptr)) {
167 *(void**)slot_ptr = value;
170 SGEN_LOG (8, "Adding remset at %p", slot_ptr);
172 binary_protocol_wbarrier (slot_ptr, value, value->vtable);
174 sgen_get_remset ()->wbarrier_set_field ((GCObject*)arr, slot_ptr, value);
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_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
186 sgen_wbarrier_value_copy_bitmap (_dest, _src, size, bitmap);
190 mono_gc_get_suspend_signal (void)
192 return mono_threads_suspend_get_suspend_signal ();
196 mono_gc_get_restart_signal (void)
198 return mono_threads_suspend_get_restart_signal ();
201 static MonoMethod *write_barrier_conc_method;
202 static MonoMethod *write_barrier_noconc_method;
205 sgen_is_critical_method (MonoMethod *method)
207 return sgen_is_managed_allocator (method);
211 sgen_has_critical_method (void)
213 return sgen_has_managed_allocator ();
217 ip_in_critical_region (MonoDomain *domain, gpointer ip)
223 * We pass false for 'try_aot' so this becomes async safe.
224 * It won't find aot methods whose jit info is not yet loaded,
225 * so we preload their jit info in the JIT.
227 ji = mono_jit_info_table_find_internal (domain, ip, FALSE, FALSE);
231 method = mono_jit_info_get_method (ji);
233 return mono_runtime_is_critical_method (method) || sgen_is_critical_method (method);
237 mono_gc_is_critical_method (MonoMethod *method)
239 return sgen_is_critical_method (method);
245 emit_nursery_check (MonoMethodBuilder *mb, int *nursery_check_return_labels, gboolean is_concurrent)
247 int shifted_nursery_start = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
249 memset (nursery_check_return_labels, 0, sizeof (int) * 2);
250 // if (ptr_in_nursery (ptr)) return;
252 * Masking out the bits might be faster, but we would have to use 64 bit
253 * immediates, which might be slower.
255 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
256 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_START);
257 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
258 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
259 mono_mb_emit_byte (mb, CEE_SHR_UN);
260 mono_mb_emit_stloc (mb, shifted_nursery_start);
262 mono_mb_emit_ldarg (mb, 0);
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_ldloc (mb, shifted_nursery_start);
267 nursery_check_return_labels [0] = mono_mb_emit_branch (mb, CEE_BEQ);
269 if (!is_concurrent) {
270 // if (!ptr_in_nursery (*ptr)) return;
271 mono_mb_emit_ldarg (mb, 0);
272 mono_mb_emit_byte (mb, CEE_LDIND_I);
273 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
274 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
275 mono_mb_emit_byte (mb, CEE_SHR_UN);
276 mono_mb_emit_ldloc (mb, shifted_nursery_start);
277 nursery_check_return_labels [1] = mono_mb_emit_branch (mb, CEE_BNE_UN);
283 mono_gc_get_specific_write_barrier (gboolean is_concurrent)
286 MonoMethodBuilder *mb;
287 MonoMethodSignature *sig;
288 MonoMethod **write_barrier_method_addr;
290 #ifdef MANAGED_WBARRIER
291 int i, nursery_check_labels [2];
294 // FIXME: Maybe create a separate version for ctors (the branch would be
295 // correctly predicted more times)
297 write_barrier_method_addr = &write_barrier_conc_method;
299 write_barrier_method_addr = &write_barrier_noconc_method;
301 if (*write_barrier_method_addr)
302 return *write_barrier_method_addr;
304 /* Create the IL version of mono_gc_barrier_generic_store () */
305 sig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
306 sig->ret = &mono_defaults.void_class->byval_arg;
307 sig->params [0] = &mono_defaults.int_class->byval_arg;
310 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_conc", MONO_WRAPPER_WRITE_BARRIER);
312 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_noconc", MONO_WRAPPER_WRITE_BARRIER);
315 #ifdef MANAGED_WBARRIER
316 emit_nursery_check (mb, nursery_check_labels, is_concurrent);
318 addr = sgen_cardtable + ((address >> CARD_BITS) & CARD_MASK)
322 LDC_PTR sgen_cardtable
328 if (SGEN_HAVE_OVERLAPPING_CARDS) {
329 LDC_PTR card_table_mask
336 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
337 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_CARD_TABLE);
338 mono_mb_emit_ldarg (mb, 0);
339 mono_mb_emit_icon (mb, CARD_BITS);
340 mono_mb_emit_byte (mb, CEE_SHR_UN);
341 mono_mb_emit_byte (mb, CEE_CONV_I);
342 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
343 #if SIZEOF_VOID_P == 8
344 mono_mb_emit_icon8 (mb, CARD_MASK);
346 mono_mb_emit_icon (mb, CARD_MASK);
348 mono_mb_emit_byte (mb, CEE_CONV_I);
349 mono_mb_emit_byte (mb, CEE_AND);
351 mono_mb_emit_byte (mb, CEE_ADD);
352 mono_mb_emit_icon (mb, 1);
353 mono_mb_emit_byte (mb, CEE_STIND_I1);
356 for (i = 0; i < 2; ++i) {
357 if (nursery_check_labels [i])
358 mono_mb_patch_branch (mb, nursery_check_labels [i]);
360 mono_mb_emit_byte (mb, CEE_RET);
362 mono_mb_emit_ldarg (mb, 0);
363 mono_mb_emit_icall (mb, mono_gc_wbarrier_generic_nostore);
364 mono_mb_emit_byte (mb, CEE_RET);
367 res = mono_mb_create_method (mb, sig, 16);
368 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
369 mono_marshal_set_wrapper_info (res, info);
373 if (*write_barrier_method_addr) {
374 /* Already created */
375 mono_free_method (res);
377 /* double-checked locking */
378 mono_memory_barrier ();
379 *write_barrier_method_addr = res;
383 return *write_barrier_method_addr;
387 mono_gc_get_write_barrier (void)
389 return mono_gc_get_specific_write_barrier (major_collector.is_concurrent);
393 * Dummy filler objects
396 /* Vtable of the objects used to fill out nursery fragments before a collection */
397 static GCVTable array_fill_vtable;
400 get_array_fill_vtable (void)
402 if (!array_fill_vtable) {
403 static MonoClass klass;
404 static char _vtable[sizeof(MonoVTable)+8];
405 MonoVTable* vtable = (MonoVTable*) ALIGN_TO((mword)_vtable, 8);
408 MonoDomain *domain = mono_get_root_domain ();
411 klass.element_class = mono_defaults.byte_class;
413 klass.instance_size = MONO_SIZEOF_MONO_ARRAY;
414 klass.sizes.element_size = 1;
415 klass.name = "array_filler_type";
417 vtable->klass = &klass;
419 vtable->gc_descr = mono_gc_make_descr_for_array (TRUE, &bmap, 0, 1);
422 array_fill_vtable = vtable;
424 return array_fill_vtable;
428 sgen_client_array_fill_range (char *start, size_t size)
432 if (size < MONO_SIZEOF_MONO_ARRAY) {
433 memset (start, 0, size);
437 o = (MonoArray*)start;
438 o->obj.vtable = (MonoVTable*)get_array_fill_vtable ();
439 /* Mark this as not a real object */
440 o->obj.synchronisation = (MonoThreadsSync *)GINT_TO_POINTER (-1);
442 o->max_length = (mono_array_size_t)(size - MONO_SIZEOF_MONO_ARRAY);
448 sgen_client_zero_array_fill_header (void *p, size_t size)
450 if (size >= MONO_SIZEOF_MONO_ARRAY) {
451 memset (p, 0, MONO_SIZEOF_MONO_ARRAY);
453 static guint8 zeros [MONO_SIZEOF_MONO_ARRAY];
455 SGEN_ASSERT (0, !memcmp (p, zeros, size), "TLAB segment must be zeroed out.");
463 static MonoGCFinalizerCallbacks fin_callbacks;
466 mono_gc_get_vtable_bits (MonoClass *klass)
469 /* FIXME move this to the bridge code */
470 if (sgen_need_bridge_processing ()) {
471 switch (sgen_bridge_class_kind (klass)) {
472 case GC_BRIDGE_TRANSPARENT_BRIDGE_CLASS:
473 case GC_BRIDGE_OPAQUE_BRIDGE_CLASS:
474 res = SGEN_GC_BIT_BRIDGE_OBJECT;
476 case GC_BRIDGE_OPAQUE_CLASS:
477 res = SGEN_GC_BIT_BRIDGE_OPAQUE_OBJECT;
479 case GC_BRIDGE_TRANSPARENT_CLASS:
483 if (fin_callbacks.is_class_finalization_aware) {
484 if (fin_callbacks.is_class_finalization_aware (klass))
485 res |= SGEN_GC_BIT_FINALIZER_AWARE;
491 is_finalization_aware (MonoObject *obj)
493 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
494 return (vt->gc_bits & SGEN_GC_BIT_FINALIZER_AWARE) == SGEN_GC_BIT_FINALIZER_AWARE;
498 sgen_client_object_queued_for_finalization (GCObject *obj)
500 if (fin_callbacks.object_queued_for_finalization && is_finalization_aware (obj))
501 fin_callbacks.object_queued_for_finalization (obj);
504 if (G_UNLIKELY (MONO_GC_FINALIZE_ENQUEUE_ENABLED ())) {
505 int gen = sgen_ptr_in_nursery (obj) ? GENERATION_NURSERY : GENERATION_OLD;
506 GCVTable vt = SGEN_LOAD_VTABLE (obj);
507 MONO_GC_FINALIZE_ENQUEUE ((mword)obj, sgen_safe_object_get_size (obj),
508 sgen_client_vtable_get_namespace (vt), sgen_client_vtable_get_name (vt), gen,
509 sgen_client_object_has_critical_finalizer (obj));
515 mono_gc_register_finalizer_callbacks (MonoGCFinalizerCallbacks *callbacks)
517 if (callbacks->version != MONO_GC_FINALIZER_EXTENSION_VERSION)
518 g_error ("Invalid finalizer callback version. Expected %d but got %d\n", MONO_GC_FINALIZER_EXTENSION_VERSION, callbacks->version);
520 fin_callbacks = *callbacks;
524 sgen_client_run_finalize (MonoObject *obj)
526 mono_gc_run_finalize (obj, NULL);
530 mono_gc_invoke_finalizers (void)
532 return sgen_gc_invoke_finalizers ();
536 mono_gc_pending_finalizers (void)
538 return sgen_have_pending_finalizers ();
542 sgen_client_finalize_notify (void)
544 mono_gc_finalize_notify ();
548 mono_gc_register_for_finalization (MonoObject *obj, void *user_data)
550 sgen_object_register_for_finalization (obj, user_data);
554 object_in_domain_predicate (MonoObject *obj, void *user_data)
556 MonoDomain *domain = (MonoDomain *)user_data;
557 if (mono_object_domain (obj) == domain) {
558 SGEN_LOG (5, "Unregistering finalizer for object: %p (%s)", obj, sgen_client_vtable_get_name (SGEN_LOAD_VTABLE (obj)));
565 * mono_gc_finalizers_for_domain:
566 * @domain: the unloading appdomain
567 * @out_array: output array
568 * @out_size: size of output array
570 * Enqueue for finalization all objects that belong to the unloading appdomain @domain
571 * @suspend is used for early termination of the enqueuing process.
574 mono_gc_finalize_domain (MonoDomain *domain)
576 sgen_finalize_if (object_in_domain_predicate, domain);
580 mono_gc_suspend_finalizers (void)
582 sgen_set_suspend_finalizers ();
589 typedef struct _EphemeronLinkNode EphemeronLinkNode;
591 struct _EphemeronLinkNode {
592 EphemeronLinkNode *next;
601 static EphemeronLinkNode *ephemeron_list;
603 /* LOCKING: requires that the GC lock is held */
605 null_ephemerons_for_domain (MonoDomain *domain)
607 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
610 MonoObject *object = (MonoObject*)current->array;
613 SGEN_ASSERT (0, object->vtable, "Can't have objects without vtables.");
615 if (object && object->vtable->domain == domain) {
616 EphemeronLinkNode *tmp = current;
619 prev->next = current->next;
621 ephemeron_list = current->next;
623 current = current->next;
624 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
627 current = current->next;
632 /* LOCKING: requires that the GC lock is held */
634 sgen_client_clear_unreachable_ephemerons (ScanCopyContext ctx)
636 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
637 SgenGrayQueue *queue = ctx.queue;
638 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
639 Ephemeron *cur, *array_end;
643 MonoArray *array = current->array;
645 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
646 EphemeronLinkNode *tmp = current;
648 SGEN_LOG (5, "Dead Ephemeron array at %p", array);
651 prev->next = current->next;
653 ephemeron_list = current->next;
655 current = current->next;
656 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
661 copy_func ((GCObject**)&array, queue);
662 current->array = array;
664 SGEN_LOG (5, "Clearing unreachable entries for ephemeron array at %p", array);
666 cur = mono_array_addr (array, Ephemeron, 0);
667 array_end = cur + mono_array_length_fast (array);
668 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
670 for (; cur < array_end; ++cur) {
671 GCObject *key = cur->key;
673 if (!key || key == tombstone)
676 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
677 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
678 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
680 if (!sgen_is_object_alive_for_current_gen (key)) {
681 cur->key = tombstone;
687 current = current->next;
692 LOCKING: requires that the GC lock is held
694 Limitations: We scan all ephemerons on every collection since the current design doesn't allow for a simple nursery/mature split.
697 sgen_client_mark_ephemerons (ScanCopyContext ctx)
699 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
700 SgenGrayQueue *queue = ctx.queue;
701 gboolean nothing_marked = TRUE;
702 EphemeronLinkNode *current = ephemeron_list;
703 Ephemeron *cur, *array_end;
706 for (current = ephemeron_list; current; current = current->next) {
707 MonoArray *array = current->array;
708 SGEN_LOG (5, "Ephemeron array at %p", array);
710 /*It has to be alive*/
711 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
712 SGEN_LOG (5, "\tnot reachable");
716 copy_func ((GCObject**)&array, queue);
718 cur = mono_array_addr (array, Ephemeron, 0);
719 array_end = cur + mono_array_length_fast (array);
720 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
722 for (; cur < array_end; ++cur) {
723 GCObject *key = cur->key;
725 if (!key || key == tombstone)
728 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
729 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
730 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
732 if (sgen_is_object_alive_for_current_gen (key)) {
733 GCObject *value = cur->value;
735 copy_func (&cur->key, queue);
737 if (!sgen_is_object_alive_for_current_gen (value))
738 nothing_marked = FALSE;
739 copy_func (&cur->value, queue);
745 SGEN_LOG (5, "Ephemeron run finished. Is it done %d", nothing_marked);
746 return nothing_marked;
750 mono_gc_ephemeron_array_add (MonoObject *obj)
752 EphemeronLinkNode *node;
756 node = (EphemeronLinkNode *)sgen_alloc_internal (INTERNAL_MEM_EPHEMERON_LINK);
761 node->array = (MonoArray*)obj;
762 node->next = ephemeron_list;
763 ephemeron_list = node;
765 SGEN_LOG (5, "Registered ephemeron array %p", obj);
776 need_remove_object_for_domain (GCObject *start, MonoDomain *domain)
778 if (mono_object_domain (start) == domain) {
779 SGEN_LOG (4, "Need to cleanup object %p", start);
780 binary_protocol_cleanup (start, (gpointer)SGEN_LOAD_VTABLE (start), sgen_safe_object_get_size ((GCObject*)start));
787 process_object_for_domain_clearing (GCObject *start, MonoDomain *domain)
789 MonoVTable *vt = SGEN_LOAD_VTABLE (start);
790 if (vt->klass == mono_defaults.internal_thread_class)
791 g_assert (mono_object_domain (start) == mono_get_root_domain ());
792 /* The object could be a proxy for an object in the domain
794 #ifndef DISABLE_REMOTING
795 if (mono_defaults.real_proxy_class->supertypes && mono_class_has_parent_fast (vt->klass, mono_defaults.real_proxy_class)) {
796 MonoObject *server = ((MonoRealProxy*)start)->unwrapped_server;
798 /* The server could already have been zeroed out, so
799 we need to check for that, too. */
800 if (server && (!SGEN_LOAD_VTABLE (server) || mono_object_domain (server) == domain)) {
801 SGEN_LOG (4, "Cleaning up remote pointer in %p to object %p", start, server);
802 ((MonoRealProxy*)start)->unwrapped_server = NULL;
809 clear_domain_process_object (GCObject *obj, MonoDomain *domain)
813 process_object_for_domain_clearing (obj, domain);
814 remove = need_remove_object_for_domain (obj, domain);
816 if (remove && obj->synchronisation) {
817 guint32 dislink = mono_monitor_get_object_monitor_gchandle (obj);
819 mono_gchandle_free (dislink);
826 clear_domain_process_minor_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
828 if (clear_domain_process_object (obj, domain)) {
829 CANARIFY_SIZE (size);
830 memset (obj, 0, size);
835 clear_domain_process_major_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
837 clear_domain_process_object (obj, domain);
841 clear_domain_free_major_non_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
843 if (need_remove_object_for_domain (obj, domain))
844 major_collector.free_non_pinned_object (obj, size);
848 clear_domain_free_major_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
850 if (need_remove_object_for_domain (obj, domain))
851 major_collector.free_pinned_object (obj, size);
855 * When appdomains are unloaded we can easily remove objects that have finalizers,
856 * but all the others could still be present in random places on the heap.
857 * We need a sweep to get rid of them even though it's going to be costly
859 * The reason we need to remove them is because we access the vtable and class
860 * structures to know the object size and the reference bitmap: once the domain is
861 * unloaded the point to random memory.
864 mono_gc_clear_domain (MonoDomain * domain)
866 LOSObject *bigobj, *prev;
871 binary_protocol_domain_unload_begin (domain);
875 if (sgen_concurrent_collection_in_progress ())
876 sgen_perform_collection (0, GENERATION_OLD, "clear domain", TRUE, FALSE);
877 SGEN_ASSERT (0, !sgen_concurrent_collection_in_progress (), "We just ordered a synchronous collection. Why are we collecting concurrently?");
879 major_collector.finish_sweeping ();
881 sgen_process_fin_stage_entries ();
883 sgen_clear_nursery_fragments ();
885 if (sgen_mono_xdomain_checks && domain != mono_get_root_domain ()) {
886 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_NORMAL);
887 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_WBARRIER);
888 sgen_check_for_xdomain_refs ();
891 /*Ephemerons and dislinks must be processed before LOS since they might end up pointing
892 to memory returned to the OS.*/
893 null_ephemerons_for_domain (domain);
894 sgen_null_links_for_domain (domain);
896 for (i = GENERATION_NURSERY; i < GENERATION_MAX; ++i)
897 sgen_remove_finalizers_if (object_in_domain_predicate, domain, i);
899 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
900 (IterateObjectCallbackFunc)clear_domain_process_minor_object_callback, domain, FALSE, TRUE);
902 /* We need two passes over major and large objects because
903 freeing such objects might give their memory back to the OS
904 (in the case of large objects) or obliterate its vtable
905 (pinned objects with major-copying or pinned and non-pinned
906 objects with major-mark&sweep), but we might need to
907 dereference a pointer from an object to another object if
908 the first object is a proxy. */
909 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, (IterateObjectCallbackFunc)clear_domain_process_major_object_callback, domain);
910 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
911 clear_domain_process_object ((GCObject*)bigobj->data, domain);
914 for (bigobj = los_object_list; bigobj;) {
915 if (need_remove_object_for_domain ((GCObject*)bigobj->data, domain)) {
916 LOSObject *to_free = bigobj;
918 prev->next = bigobj->next;
920 los_object_list = bigobj->next;
921 bigobj = bigobj->next;
922 SGEN_LOG (4, "Freeing large object %p", bigobj->data);
923 sgen_los_free_object (to_free);
927 bigobj = bigobj->next;
929 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_NON_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_non_pinned_object_callback, domain);
930 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_pinned_object_callback, domain);
932 if (domain == mono_get_root_domain ()) {
933 sgen_pin_stats_report ();
934 sgen_object_layout_dump (stdout);
937 sgen_restart_world (0);
939 binary_protocol_domain_unload_end (domain);
940 binary_protocol_flush_buffers (FALSE);
950 mono_gc_alloc_obj (MonoVTable *vtable, size_t size)
952 MonoObject *obj = sgen_alloc_obj (vtable, size);
954 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
956 mono_profiler_allocation (obj);
963 mono_gc_alloc_pinned_obj (MonoVTable *vtable, size_t size)
965 MonoObject *obj = sgen_alloc_obj_pinned (vtable, size);
967 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
969 mono_profiler_allocation (obj);
976 mono_gc_alloc_mature (MonoVTable *vtable, size_t size)
978 MonoObject *obj = sgen_alloc_obj_mature (vtable, size);
980 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
982 mono_profiler_allocation (obj);
989 mono_gc_alloc_fixed (size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
991 /* FIXME: do a single allocation */
992 void *res = g_calloc (1, size);
995 if (!mono_gc_register_root ((char *)res, size, descr, source, msg)) {
1003 mono_gc_free_fixed (void* addr)
1005 mono_gc_deregister_root ((char *)addr);
1013 static MonoMethod* alloc_method_cache [ATYPE_NUM];
1014 static MonoMethod* slowpath_alloc_method_cache [ATYPE_NUM];
1015 static gboolean use_managed_allocator = TRUE;
1017 #ifdef MANAGED_ALLOCATION
1019 #if defined(HAVE_KW_THREAD) || defined(TARGET_OSX) || defined(TARGET_WIN32) || defined(TARGET_ANDROID) || defined(TARGET_IOS)
1021 // Cache the SgenThreadInfo pointer in a local 'var'.
1022 #define EMIT_TLS_ACCESS_VAR(mb, var) \
1024 var = mono_mb_add_local ((mb), &mono_defaults.int_class->byval_arg); \
1025 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1026 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1027 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1028 mono_mb_emit_stloc ((mb), (var)); \
1031 #define EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR(mb, var) \
1033 mono_mb_emit_ldloc ((mb), (var)); \
1034 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenClientThreadInfo, in_critical_region)); \
1035 mono_mb_emit_byte ((mb), CEE_ADD); \
1038 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb, var) do { \
1039 mono_mb_emit_ldloc ((mb), (var)); \
1040 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_next)); \
1041 mono_mb_emit_byte ((mb), CEE_ADD); \
1044 #define EMIT_TLS_ACCESS_TEMP_END(mb, var) do { \
1045 mono_mb_emit_ldloc ((mb), (var)); \
1046 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_temp_end)); \
1047 mono_mb_emit_byte ((mb), CEE_ADD); \
1048 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1052 #define EMIT_TLS_ACCESS_VAR(mb, _var) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1053 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb, _var) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1054 #define EMIT_TLS_ACCESS_TEMP_END(mb, _var) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1055 #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)
1059 /* FIXME: Do this in the JIT, where specialized allocation sequences can be created
1060 * for each class. This is currently not easy to do, as it is hard to generate basic
1061 * blocks + branches, but it is easy with the linear IL codebase.
1063 * For this to work we'd need to solve the TLAB race, first. Now we
1064 * require the allocator to be in a few known methods to make sure
1065 * that they are executed atomically via the restart mechanism.
1068 create_allocator (int atype, ManagedAllocatorVariant variant)
1070 int p_var, size_var, real_size_var, thread_var G_GNUC_UNUSED;
1071 gboolean slowpath = variant == MANAGED_ALLOCATOR_SLOW_PATH;
1072 guint32 slowpath_branch, max_size_branch;
1073 MonoMethodBuilder *mb;
1075 MonoMethodSignature *csig;
1076 static gboolean registered = FALSE;
1077 int tlab_next_addr_var, new_next_var;
1078 const char *name = NULL;
1083 mono_register_jit_icall (mono_gc_alloc_obj, "mono_gc_alloc_obj", mono_create_icall_signature ("object ptr int"), FALSE);
1084 mono_register_jit_icall (mono_gc_alloc_vector, "mono_gc_alloc_vector", mono_create_icall_signature ("object ptr int int"), FALSE);
1085 mono_register_jit_icall (mono_gc_alloc_string, "mono_gc_alloc_string", mono_create_icall_signature ("object ptr int int32"), FALSE);
1089 if (atype == ATYPE_SMALL) {
1090 name = slowpath ? "SlowAllocSmall" : "AllocSmall";
1091 } else if (atype == ATYPE_NORMAL) {
1092 name = slowpath ? "SlowAlloc" : "Alloc";
1093 } else if (atype == ATYPE_VECTOR) {
1094 name = slowpath ? "SlowAllocVector" : "AllocVector";
1095 } else if (atype == ATYPE_STRING) {
1096 name = slowpath ? "SlowAllocString" : "AllocString";
1098 g_assert_not_reached ();
1101 if (atype == ATYPE_NORMAL)
1106 csig = mono_metadata_signature_alloc (mono_defaults.corlib, num_params);
1107 if (atype == ATYPE_STRING) {
1108 csig->ret = &mono_defaults.string_class->byval_arg;
1109 csig->params [0] = &mono_defaults.int_class->byval_arg;
1110 csig->params [1] = &mono_defaults.int32_class->byval_arg;
1112 csig->ret = &mono_defaults.object_class->byval_arg;
1113 for (i = 0; i < num_params; i++)
1114 csig->params [i] = &mono_defaults.int_class->byval_arg;
1117 mb = mono_mb_new (mono_defaults.object_class, name, MONO_WRAPPER_ALLOC);
1124 mono_mb_emit_ldarg (mb, 0);
1125 mono_mb_emit_icall (mb, ves_icall_object_new_specific);
1128 mono_mb_emit_ldarg (mb, 0);
1129 mono_mb_emit_ldarg (mb, 1);
1130 mono_mb_emit_icall (mb, ves_icall_array_new_specific);
1133 mono_mb_emit_ldarg (mb, 1);
1134 mono_mb_emit_icall (mb, ves_icall_string_alloc);
1137 g_assert_not_reached ();
1144 * Tls access might call foreign code or code without jinfo. This can
1145 * only happen if we are outside of the critical region.
1147 EMIT_TLS_ACCESS_VAR (mb, thread_var);
1149 size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1150 if (atype == ATYPE_SMALL) {
1151 /* size_var = size_arg */
1152 mono_mb_emit_ldarg (mb, 1);
1153 mono_mb_emit_stloc (mb, size_var);
1154 } else if (atype == ATYPE_NORMAL) {
1155 /* size = vtable->klass->instance_size; */
1156 mono_mb_emit_ldarg (mb, 0);
1157 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1158 mono_mb_emit_byte (mb, CEE_ADD);
1159 mono_mb_emit_byte (mb, CEE_LDIND_I);
1160 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, instance_size));
1161 mono_mb_emit_byte (mb, CEE_ADD);
1162 /* FIXME: assert instance_size stays a 4 byte integer */
1163 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1164 mono_mb_emit_byte (mb, CEE_CONV_I);
1165 mono_mb_emit_stloc (mb, size_var);
1166 } else if (atype == ATYPE_VECTOR) {
1167 MonoExceptionClause *clause;
1168 int pos, pos_leave, pos_error;
1169 MonoClass *oom_exc_class;
1173 * n > MONO_ARRAY_MAX_INDEX => OutOfMemoryException
1174 * n < 0 => OverflowException
1176 * We can do an unsigned comparison to catch both cases, then in the error
1177 * case compare signed to distinguish between them.
1179 mono_mb_emit_ldarg (mb, 1);
1180 mono_mb_emit_icon (mb, MONO_ARRAY_MAX_INDEX);
1181 mono_mb_emit_byte (mb, CEE_CONV_U);
1182 pos = mono_mb_emit_short_branch (mb, CEE_BLE_UN_S);
1184 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1185 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1186 mono_mb_emit_ldarg (mb, 1);
1187 mono_mb_emit_icon (mb, 0);
1188 pos_error = mono_mb_emit_short_branch (mb, CEE_BLT_S);
1189 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1190 mono_mb_patch_short_branch (mb, pos_error);
1191 mono_mb_emit_exception (mb, "OverflowException", NULL);
1193 mono_mb_patch_short_branch (mb, pos);
1195 clause = (MonoExceptionClause *)mono_image_alloc0 (mono_defaults.corlib, sizeof (MonoExceptionClause));
1196 clause->try_offset = mono_mb_get_label (mb);
1198 /* vtable->klass->sizes.element_size */
1199 mono_mb_emit_ldarg (mb, 0);
1200 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1201 mono_mb_emit_byte (mb, CEE_ADD);
1202 mono_mb_emit_byte (mb, CEE_LDIND_I);
1203 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, sizes));
1204 mono_mb_emit_byte (mb, CEE_ADD);
1205 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1206 mono_mb_emit_byte (mb, CEE_CONV_I);
1209 mono_mb_emit_ldarg (mb, 1);
1210 mono_mb_emit_byte (mb, CEE_MUL_OVF_UN);
1211 /* + sizeof (MonoArray) */
1212 mono_mb_emit_icon (mb, MONO_SIZEOF_MONO_ARRAY);
1213 mono_mb_emit_byte (mb, CEE_ADD_OVF_UN);
1214 mono_mb_emit_stloc (mb, size_var);
1216 pos_leave = mono_mb_emit_branch (mb, CEE_LEAVE);
1219 clause->flags = MONO_EXCEPTION_CLAUSE_NONE;
1220 clause->try_len = mono_mb_get_pos (mb) - clause->try_offset;
1221 clause->data.catch_class = mono_class_load_from_name (mono_defaults.corlib,
1222 "System", "OverflowException");
1223 clause->handler_offset = mono_mb_get_label (mb);
1225 oom_exc_class = mono_class_load_from_name (mono_defaults.corlib,
1226 "System", "OutOfMemoryException");
1227 ctor = mono_class_get_method_from_name (oom_exc_class, ".ctor", 0);
1230 mono_mb_emit_byte (mb, CEE_POP);
1231 mono_mb_emit_op (mb, CEE_NEWOBJ, ctor);
1232 mono_mb_emit_byte (mb, CEE_THROW);
1234 clause->handler_len = mono_mb_get_pos (mb) - clause->handler_offset;
1235 mono_mb_set_clauses (mb, 1, clause);
1236 mono_mb_patch_branch (mb, pos_leave);
1238 } else if (atype == ATYPE_STRING) {
1242 * a string allocator method takes the args: (vtable, len)
1244 * bytes = offsetof (MonoString, chars) + ((len + 1) * 2)
1248 * bytes <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1252 * offsetof (MonoString, chars) + ((len + 1) * 2) <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1253 * len <= (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - offsetof (MonoString, chars)) / 2 - 1
1255 mono_mb_emit_ldarg (mb, 1);
1256 mono_mb_emit_icon (mb, (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - MONO_STRUCT_OFFSET (MonoString, chars)) / 2 - 1);
1257 pos = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
1259 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1260 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1261 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1262 mono_mb_patch_short_branch (mb, pos);
1264 mono_mb_emit_ldarg (mb, 1);
1265 mono_mb_emit_icon (mb, 1);
1266 mono_mb_emit_byte (mb, MONO_CEE_SHL);
1267 //WE manually fold the above + 2 here
1268 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, chars) + 2);
1269 mono_mb_emit_byte (mb, CEE_ADD);
1270 mono_mb_emit_stloc (mb, size_var);
1272 g_assert_not_reached ();
1275 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1276 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1277 mono_mb_emit_byte (mb, CEE_LDC_I4_1);
1278 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1279 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1280 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_NONE);
1283 if (nursery_canaries_enabled ()) {
1284 real_size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1285 mono_mb_emit_ldloc (mb, size_var);
1286 mono_mb_emit_stloc(mb, real_size_var);
1289 real_size_var = size_var;
1291 /* size += ALLOC_ALIGN - 1; */
1292 mono_mb_emit_ldloc (mb, size_var);
1293 mono_mb_emit_icon (mb, SGEN_ALLOC_ALIGN - 1);
1294 mono_mb_emit_byte (mb, CEE_ADD);
1295 /* size &= ~(ALLOC_ALIGN - 1); */
1296 mono_mb_emit_icon (mb, ~(SGEN_ALLOC_ALIGN - 1));
1297 mono_mb_emit_byte (mb, CEE_AND);
1298 mono_mb_emit_stloc (mb, size_var);
1300 /* if (size > MAX_SMALL_OBJ_SIZE) goto slowpath */
1301 if (atype != ATYPE_SMALL) {
1302 mono_mb_emit_ldloc (mb, size_var);
1303 mono_mb_emit_icon (mb, SGEN_MAX_SMALL_OBJ_SIZE);
1304 max_size_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
1308 * We need to modify tlab_next, but the JIT only supports reading, so we read
1309 * another tls var holding its address instead.
1312 /* tlab_next_addr (local) = tlab_next_addr (TLS var) */
1313 tlab_next_addr_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1314 EMIT_TLS_ACCESS_NEXT_ADDR (mb, thread_var);
1315 mono_mb_emit_stloc (mb, tlab_next_addr_var);
1317 /* p = (void**)tlab_next; */
1318 p_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1319 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1320 mono_mb_emit_byte (mb, CEE_LDIND_I);
1321 mono_mb_emit_stloc (mb, p_var);
1323 /* new_next = (char*)p + size; */
1324 new_next_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1325 mono_mb_emit_ldloc (mb, p_var);
1326 mono_mb_emit_ldloc (mb, size_var);
1327 mono_mb_emit_byte (mb, CEE_CONV_I);
1328 mono_mb_emit_byte (mb, CEE_ADD);
1330 if (nursery_canaries_enabled ()) {
1331 mono_mb_emit_icon (mb, CANARY_SIZE);
1332 mono_mb_emit_byte (mb, CEE_ADD);
1334 mono_mb_emit_stloc (mb, new_next_var);
1336 /* if (G_LIKELY (new_next < tlab_temp_end)) */
1337 mono_mb_emit_ldloc (mb, new_next_var);
1338 EMIT_TLS_ACCESS_TEMP_END (mb, thread_var);
1339 slowpath_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
1342 if (atype != ATYPE_SMALL)
1343 mono_mb_patch_short_branch (mb, max_size_branch);
1345 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1346 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1348 * We are no longer in a critical section. We need to do this before calling
1349 * to unmanaged land in order to avoid stw deadlocks since unmanaged code
1352 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1353 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1354 mono_mb_emit_byte (mb, CEE_LDC_I4_0);
1355 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1356 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1357 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_NONE);
1360 /* FIXME: mono_gc_alloc_obj takes a 'size_t' as an argument, not an int32 */
1361 mono_mb_emit_ldarg (mb, 0);
1362 mono_mb_emit_ldloc (mb, real_size_var);
1363 if (atype == ATYPE_NORMAL || atype == ATYPE_SMALL) {
1364 mono_mb_emit_icall (mb, mono_gc_alloc_obj);
1365 } else if (atype == ATYPE_VECTOR) {
1366 mono_mb_emit_ldarg (mb, 1);
1367 mono_mb_emit_icall (mb, mono_gc_alloc_vector);
1368 } else if (atype == ATYPE_STRING) {
1369 mono_mb_emit_ldarg (mb, 1);
1370 mono_mb_emit_icall (mb, mono_gc_alloc_string);
1372 g_assert_not_reached ();
1374 mono_mb_emit_byte (mb, CEE_RET);
1377 mono_mb_patch_short_branch (mb, slowpath_branch);
1379 /* FIXME: Memory barrier */
1381 /* tlab_next = new_next */
1382 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1383 mono_mb_emit_ldloc (mb, new_next_var);
1384 mono_mb_emit_byte (mb, CEE_STIND_I);
1387 mono_mb_emit_ldloc (mb, p_var);
1388 mono_mb_emit_ldarg (mb, 0);
1389 mono_mb_emit_byte (mb, CEE_STIND_I);
1391 /* mark object end with nursery word */
1392 if (nursery_canaries_enabled ()) {
1393 mono_mb_emit_ldloc (mb, p_var);
1394 mono_mb_emit_ldloc (mb, real_size_var);
1395 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1396 mono_mb_emit_icon8 (mb, (mword) CANARY_STRING);
1397 mono_mb_emit_icon (mb, CANARY_SIZE);
1398 mono_mb_emit_byte (mb, MONO_CEE_PREFIX1);
1399 mono_mb_emit_byte (mb, CEE_CPBLK);
1402 if (atype == ATYPE_VECTOR) {
1403 /* arr->max_length = max_length; */
1404 mono_mb_emit_ldloc (mb, p_var);
1405 mono_mb_emit_ldflda (mb, MONO_STRUCT_OFFSET (MonoArray, max_length));
1406 mono_mb_emit_ldarg (mb, 1);
1407 #ifdef MONO_BIG_ARRAYS
1408 mono_mb_emit_byte (mb, CEE_STIND_I);
1410 mono_mb_emit_byte (mb, CEE_STIND_I4);
1412 } else if (atype == ATYPE_STRING) {
1413 /* need to set length and clear the last char */
1414 /* s->length = len; */
1415 mono_mb_emit_ldloc (mb, p_var);
1416 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, length));
1417 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1418 mono_mb_emit_ldarg (mb, 1);
1419 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
1422 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1423 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1424 mono_mb_emit_byte (mb, CEE_LDC_I4_0);
1425 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1426 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1428 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1429 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1432 We must make sure both vtable and max_length are globaly visible before returning to managed land.
1434 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1437 mono_mb_emit_ldloc (mb, p_var);
1440 mono_mb_emit_byte (mb, CEE_RET);
1443 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
1444 info->d.alloc.gc_name = "sgen";
1445 info->d.alloc.alloc_type = atype;
1448 mb->init_locals = FALSE;
1451 res = mono_mb_create (mb, csig, 8, info);
1460 mono_gc_get_aligned_size_for_allocator (int size)
1462 return SGEN_ALIGN_UP (size);
1466 * Generate an allocator method implementing the fast path of mono_gc_alloc_obj ().
1467 * The signature of the called method is:
1468 * object allocate (MonoVTable *vtable)
1471 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box, gboolean known_instance_size)
1473 #ifdef MANAGED_ALLOCATION
1474 if (collect_before_allocs)
1476 if (!mono_runtime_has_tls_get ())
1478 if (klass->instance_size > tlab_size)
1480 if (known_instance_size && ALIGN_TO (klass->instance_size, SGEN_ALLOC_ALIGN) >= SGEN_MAX_SMALL_OBJ_SIZE)
1482 if (mono_class_has_finalizer (klass) || mono_class_is_marshalbyref (klass))
1486 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1488 if (klass->byval_arg.type == MONO_TYPE_STRING)
1489 return mono_gc_get_managed_allocator_by_type (ATYPE_STRING, MANAGED_ALLOCATOR_REGULAR);
1490 /* Generic classes have dynamic field and can go above MAX_SMALL_OBJ_SIZE. */
1491 if (known_instance_size)
1492 return mono_gc_get_managed_allocator_by_type (ATYPE_SMALL, MANAGED_ALLOCATOR_REGULAR);
1494 return mono_gc_get_managed_allocator_by_type (ATYPE_NORMAL, MANAGED_ALLOCATOR_REGULAR);
1501 mono_gc_get_managed_array_allocator (MonoClass *klass)
1503 #ifdef MANAGED_ALLOCATION
1504 if (klass->rank != 1)
1506 if (!mono_runtime_has_tls_get ())
1508 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1510 if (has_per_allocation_action)
1512 g_assert (!mono_class_has_finalizer (klass) && !mono_class_is_marshalbyref (klass));
1514 return mono_gc_get_managed_allocator_by_type (ATYPE_VECTOR, MANAGED_ALLOCATOR_REGULAR);
1521 sgen_set_use_managed_allocator (gboolean flag)
1523 use_managed_allocator = flag;
1527 mono_gc_get_managed_allocator_by_type (int atype, ManagedAllocatorVariant variant)
1529 #ifdef MANAGED_ALLOCATION
1533 if (variant == MANAGED_ALLOCATOR_REGULAR && !use_managed_allocator)
1536 if (variant == MANAGED_ALLOCATOR_REGULAR && !mono_runtime_has_tls_get ())
1540 case MANAGED_ALLOCATOR_REGULAR: cache = alloc_method_cache; break;
1541 case MANAGED_ALLOCATOR_SLOW_PATH: cache = slowpath_alloc_method_cache; break;
1542 default: g_assert_not_reached (); break;
1545 res = cache [atype];
1549 res = create_allocator (atype, variant);
1551 if (cache [atype]) {
1552 mono_free_method (res);
1553 res = cache [atype];
1555 mono_memory_barrier ();
1556 cache [atype] = res;
1567 mono_gc_get_managed_allocator_types (void)
1573 sgen_is_managed_allocator (MonoMethod *method)
1577 for (i = 0; i < ATYPE_NUM; ++i)
1578 if (method == alloc_method_cache [i] || method == slowpath_alloc_method_cache [i])
1584 sgen_has_managed_allocator (void)
1588 for (i = 0; i < ATYPE_NUM; ++i)
1589 if (alloc_method_cache [i] || slowpath_alloc_method_cache [i])
1595 * Cardtable scanning
1598 #define MWORD_MASK (sizeof (mword) - 1)
1601 find_card_offset (mword card)
1603 /*XXX Use assembly as this generates some pretty bad code */
1604 #if defined(__i386__) && defined(__GNUC__)
1605 return (__builtin_ffs (card) - 1) / 8;
1606 #elif defined(__x86_64__) && defined(__GNUC__)
1607 return (__builtin_ffsll (card) - 1) / 8;
1608 #elif defined(__s390x__)
1609 return (__builtin_ffsll (GUINT64_TO_LE(card)) - 1) / 8;
1612 guint8 *ptr = (guint8 *) &card;
1613 for (i = 0; i < sizeof (mword); ++i) {
1622 find_next_card (guint8 *card_data, guint8 *end)
1624 mword *cards, *cards_end;
1627 while ((((mword)card_data) & MWORD_MASK) && card_data < end) {
1633 if (card_data == end)
1636 cards = (mword*)card_data;
1637 cards_end = (mword*)((mword)end & ~MWORD_MASK);
1638 while (cards < cards_end) {
1641 return (guint8*)cards + find_card_offset (card);
1645 card_data = (guint8*)cards_end;
1646 while (card_data < end) {
1655 #define ARRAY_OBJ_INDEX(ptr,array,elem_size) (((char*)(ptr) - ((char*)(array) + G_STRUCT_OFFSET (MonoArray, vector))) / (elem_size))
1658 sgen_client_cardtable_scan_object (GCObject *obj, mword block_obj_size, guint8 *cards, ScanCopyContext ctx)
1660 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
1661 MonoClass *klass = vt->klass;
1663 SGEN_ASSERT (0, SGEN_VTABLE_HAS_REFERENCES (vt), "Why would we ever call this on reference-free objects?");
1666 MonoArray *arr = (MonoArray*)obj;
1667 guint8 *card_data, *card_base;
1668 guint8 *card_data_end;
1669 char *obj_start = (char *)sgen_card_table_align_pointer (obj);
1671 mword obj_size = sgen_mono_array_size (vt, arr, &bounds_size, sgen_vtable_get_descriptor (vt));
1672 /* We don't want to scan the bounds entries at the end of multidimensional arrays */
1673 char *obj_end = (char*)obj + obj_size - bounds_size;
1675 size_t extra_idx = 0;
1677 mword desc = (mword)klass->element_class->gc_descr;
1678 int elem_size = mono_array_element_size (klass);
1680 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1681 guint8 *overflow_scan_end = NULL;
1684 #ifdef SGEN_OBJECT_LAYOUT_STATISTICS
1685 if (klass->element_class->valuetype)
1686 sgen_object_layout_scanned_vtype_array ();
1688 sgen_object_layout_scanned_ref_array ();
1694 card_data = sgen_card_table_get_card_scan_address ((mword)obj);
1696 card_base = card_data;
1697 card_count = sgen_card_table_number_of_cards_in_range ((mword)obj, obj_size);
1698 card_data_end = card_data + card_count;
1701 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1702 /*Check for overflow and if so, setup to scan in two steps*/
1703 if (!cards && card_data_end >= SGEN_SHADOW_CARDTABLE_END) {
1704 overflow_scan_end = sgen_shadow_cardtable + (card_data_end - SGEN_SHADOW_CARDTABLE_END);
1705 card_data_end = SGEN_SHADOW_CARDTABLE_END;
1711 card_data = find_next_card (card_data, card_data_end);
1712 for (; card_data < card_data_end; card_data = find_next_card (card_data + 1, card_data_end)) {
1714 size_t idx = (card_data - card_base) + extra_idx;
1715 char *start = (char*)(obj_start + idx * CARD_SIZE_IN_BYTES);
1716 char *card_end = start + CARD_SIZE_IN_BYTES;
1717 char *first_elem, *elem;
1719 HEAVY_STAT (++los_marked_cards);
1722 sgen_card_table_prepare_card_for_scanning (card_data);
1724 card_end = MIN (card_end, obj_end);
1726 if (start <= (char*)arr->vector)
1729 index = ARRAY_OBJ_INDEX (start, obj, elem_size);
1731 elem = first_elem = (char*)mono_array_addr_with_size_fast ((MonoArray*)obj, elem_size, index);
1732 if (klass->element_class->valuetype) {
1733 ScanVTypeFunc scan_vtype_func = ctx.ops->scan_vtype;
1735 for (; elem < card_end; elem += elem_size)
1736 scan_vtype_func (obj, elem, desc, ctx.queue BINARY_PROTOCOL_ARG (elem_size));
1738 ScanPtrFieldFunc scan_ptr_field_func = ctx.ops->scan_ptr_field;
1740 HEAVY_STAT (++los_array_cards);
1741 for (; elem < card_end; elem += SIZEOF_VOID_P)
1742 scan_ptr_field_func (obj, (GCObject**)elem, ctx.queue);
1745 binary_protocol_card_scan (first_elem, elem - first_elem);
1748 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1749 if (overflow_scan_end) {
1750 extra_idx = card_data - card_base;
1751 card_base = card_data = sgen_shadow_cardtable;
1752 card_data_end = overflow_scan_end;
1753 overflow_scan_end = NULL;
1764 * Array and string allocation
1768 mono_gc_alloc_vector (MonoVTable *vtable, size_t size, uintptr_t max_length)
1773 if (!SGEN_CAN_ALIGN_UP (size))
1776 #ifndef DISABLE_CRITICAL_REGION
1777 ENTER_CRITICAL_REGION;
1778 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1780 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1781 arr->max_length = (mono_array_size_t)max_length;
1782 EXIT_CRITICAL_REGION;
1785 EXIT_CRITICAL_REGION;
1790 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1791 if (G_UNLIKELY (!arr)) {
1796 arr->max_length = (mono_array_size_t)max_length;
1801 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1802 mono_profiler_allocation (&arr->obj);
1804 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Vector has incorrect size.");
1809 mono_gc_alloc_array (MonoVTable *vtable, size_t size, uintptr_t max_length, uintptr_t bounds_size)
1812 MonoArrayBounds *bounds;
1815 if (!SGEN_CAN_ALIGN_UP (size))
1818 #ifndef DISABLE_CRITICAL_REGION
1819 ENTER_CRITICAL_REGION;
1820 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1822 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1823 arr->max_length = (mono_array_size_t)max_length;
1825 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1826 arr->bounds = bounds;
1827 EXIT_CRITICAL_REGION;
1830 EXIT_CRITICAL_REGION;
1835 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1836 if (G_UNLIKELY (!arr)) {
1841 arr->max_length = (mono_array_size_t)max_length;
1843 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1844 arr->bounds = bounds;
1849 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1850 mono_profiler_allocation (&arr->obj);
1852 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Array has incorrect size.");
1857 mono_gc_alloc_string (MonoVTable *vtable, size_t size, gint32 len)
1862 if (!SGEN_CAN_ALIGN_UP (size))
1865 #ifndef DISABLE_CRITICAL_REGION
1866 ENTER_CRITICAL_REGION;
1867 str = (MonoString*)sgen_try_alloc_obj_nolock (vtable, size);
1869 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1871 EXIT_CRITICAL_REGION;
1874 EXIT_CRITICAL_REGION;
1879 str = (MonoString*)sgen_alloc_obj_nolock (vtable, size);
1880 if (G_UNLIKELY (!str)) {
1890 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1891 mono_profiler_allocation (&str->object);
1901 mono_gc_set_string_length (MonoString *str, gint32 new_length)
1903 mono_unichar2 *new_end = str->chars + new_length;
1905 /* zero the discarded string. This null-delimits the string and allows
1906 * the space to be reclaimed by SGen. */
1908 if (nursery_canaries_enabled () && sgen_ptr_in_nursery (str)) {
1909 CHECK_CANARY_FOR_OBJECT ((GCObject*)str, TRUE);
1910 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2) + CANARY_SIZE);
1911 memcpy (new_end + 1 , CANARY_STRING, CANARY_SIZE);
1913 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2));
1916 str->length = new_length;
1923 #define GC_ROOT_NUM 32
1925 int count; /* must be the first field */
1926 void *objects [GC_ROOT_NUM];
1927 int root_types [GC_ROOT_NUM];
1928 uintptr_t extra_info [GC_ROOT_NUM];
1932 notify_gc_roots (GCRootReport *report)
1936 mono_profiler_gc_roots (report->count, report->objects, report->root_types, report->extra_info);
1941 add_profile_gc_root (GCRootReport *report, void *object, int rtype, uintptr_t extra_info)
1943 if (report->count == GC_ROOT_NUM)
1944 notify_gc_roots (report);
1945 report->objects [report->count] = object;
1946 report->root_types [report->count] = rtype;
1947 report->extra_info [report->count++] = (uintptr_t)SGEN_LOAD_VTABLE (object)->klass;
1951 sgen_client_nursery_objects_pinned (void **definitely_pinned, int count)
1953 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS) {
1954 GCRootReport report;
1957 for (idx = 0; idx < count; ++idx)
1958 add_profile_gc_root (&report, definitely_pinned [idx], MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
1959 notify_gc_roots (&report);
1964 report_finalizer_roots_from_queue (SgenPointerQueue *queue)
1966 GCRootReport report;
1970 for (i = 0; i < queue->next_slot; ++i) {
1971 void *obj = queue->data [i];
1974 add_profile_gc_root (&report, obj, MONO_PROFILE_GC_ROOT_FINALIZER, 0);
1976 notify_gc_roots (&report);
1980 report_finalizer_roots (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
1982 report_finalizer_roots_from_queue (fin_ready_queue);
1983 report_finalizer_roots_from_queue (critical_fin_queue);
1986 static GCRootReport *root_report;
1989 single_arg_report_root (MonoObject **obj, void *gc_data)
1992 add_profile_gc_root (root_report, *obj, MONO_PROFILE_GC_ROOT_OTHER, 0);
1996 precisely_report_roots_from (GCRootReport *report, void** start_root, void** end_root, mword desc)
1998 switch (desc & ROOT_DESC_TYPE_MASK) {
1999 case ROOT_DESC_BITMAP:
2000 desc >>= ROOT_DESC_TYPE_SHIFT;
2002 if ((desc & 1) && *start_root) {
2003 add_profile_gc_root (report, *start_root, MONO_PROFILE_GC_ROOT_OTHER, 0);
2009 case ROOT_DESC_COMPLEX: {
2010 gsize *bitmap_data = (gsize *)sgen_get_complex_descriptor_bitmap (desc);
2011 gsize bwords = (*bitmap_data) - 1;
2012 void **start_run = start_root;
2014 while (bwords-- > 0) {
2015 gsize bmap = *bitmap_data++;
2016 void **objptr = start_run;
2018 if ((bmap & 1) && *objptr) {
2019 add_profile_gc_root (report, *objptr, MONO_PROFILE_GC_ROOT_OTHER, 0);
2024 start_run += GC_BITS_PER_WORD;
2028 case ROOT_DESC_USER: {
2029 MonoGCRootMarkFunc marker = (MonoGCRootMarkFunc)sgen_get_user_descriptor_func (desc);
2030 root_report = report;
2031 marker ((MonoObject**)start_root, single_arg_report_root, NULL);
2034 case ROOT_DESC_RUN_LEN:
2035 g_assert_not_reached ();
2037 g_assert_not_reached ();
2042 report_registered_roots_by_type (int root_type)
2044 GCRootReport report;
2048 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], void **, start_root, RootRecord *, root) {
2049 SGEN_LOG (6, "Precise root scan %p-%p (desc: %p)", start_root, root->end_root, (void*)root->root_desc);
2050 precisely_report_roots_from (&report, start_root, (void**)root->end_root, root->root_desc);
2051 } SGEN_HASH_TABLE_FOREACH_END;
2052 notify_gc_roots (&report);
2056 report_registered_roots (void)
2058 report_registered_roots_by_type (ROOT_TYPE_NORMAL);
2059 report_registered_roots_by_type (ROOT_TYPE_WBARRIER);
2063 sgen_client_collecting_minor (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2065 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2066 report_registered_roots ();
2067 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2068 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2071 static GCRootReport major_root_report;
2072 static gboolean profile_roots;
2075 sgen_client_collecting_major_1 (void)
2077 profile_roots = mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS;
2078 memset (&major_root_report, 0, sizeof (GCRootReport));
2082 sgen_client_pinned_los_object (GCObject *obj)
2085 add_profile_gc_root (&major_root_report, (char*)obj, MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
2089 sgen_client_collecting_major_2 (void)
2092 notify_gc_roots (&major_root_report);
2094 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2095 report_registered_roots ();
2099 sgen_client_collecting_major_3 (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2101 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2102 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2105 #define MOVED_OBJECTS_NUM 64
2106 static void *moved_objects [MOVED_OBJECTS_NUM];
2107 static int moved_objects_idx = 0;
2109 static SgenPointerQueue moved_objects_queue = SGEN_POINTER_QUEUE_INIT (INTERNAL_MEM_MOVED_OBJECT);
2112 mono_sgen_register_moved_object (void *obj, void *destination)
2115 * This function can be called from SGen's worker threads. We want to try
2116 * and avoid exposing those threads to the profiler API, so queue up move
2117 * events and send them later when the main GC thread calls
2118 * mono_sgen_gc_event_moves ().
2120 * TODO: Once SGen has multiple worker threads, we need to switch to a
2121 * lock-free data structure for the queue as multiple threads will be
2122 * adding to it at the same time.
2124 if (sgen_thread_pool_is_thread_pool_thread (mono_native_thread_id_get ())) {
2125 sgen_pointer_queue_add (&moved_objects_queue, obj);
2126 sgen_pointer_queue_add (&moved_objects_queue, destination);
2128 if (moved_objects_idx == MOVED_OBJECTS_NUM) {
2129 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2130 moved_objects_idx = 0;
2133 moved_objects [moved_objects_idx++] = obj;
2134 moved_objects [moved_objects_idx++] = destination;
2139 mono_sgen_gc_event_moves (void)
2141 while (!sgen_pointer_queue_is_empty (&moved_objects_queue)) {
2142 void *dst = sgen_pointer_queue_pop (&moved_objects_queue);
2143 void *src = sgen_pointer_queue_pop (&moved_objects_queue);
2145 mono_sgen_register_moved_object (src, dst);
2148 if (moved_objects_idx) {
2149 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2150 moved_objects_idx = 0;
2158 #define REFS_SIZE 128
2161 MonoGCReferences callback;
2165 MonoObject *refs [REFS_SIZE];
2166 uintptr_t offsets [REFS_SIZE];
2170 #define HANDLE_PTR(ptr,obj) do { \
2172 if (hwi->count == REFS_SIZE) { \
2173 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data); \
2177 hwi->offsets [hwi->count] = (char*)(ptr)-(char*)start; \
2178 hwi->refs [hwi->count++] = *(ptr); \
2183 collect_references (HeapWalkInfo *hwi, GCObject *obj, size_t size)
2185 char *start = (char*)obj;
2186 mword desc = sgen_obj_get_descriptor (obj);
2188 #include "sgen/sgen-scan-object.h"
2192 walk_references (GCObject *start, size_t size, void *data)
2194 HeapWalkInfo *hwi = (HeapWalkInfo *)data;
2197 collect_references (hwi, start, size);
2198 if (hwi->count || !hwi->called)
2199 hwi->callback (start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data);
2203 * mono_gc_walk_heap:
2204 * @flags: flags for future use
2205 * @callback: a function pointer called for each object in the heap
2206 * @data: a user data pointer that is passed to callback
2208 * This function can be used to iterate over all the live objects in the heap:
2209 * for each object, @callback is invoked, providing info about the object's
2210 * location in memory, its class, its size and the objects it references.
2211 * For each referenced object it's offset from the object address is
2212 * reported in the offsets array.
2213 * The object references may be buffered, so the callback may be invoked
2214 * multiple times for the same object: in all but the first call, the size
2215 * argument will be zero.
2216 * Note that this function can be only called in the #MONO_GC_EVENT_PRE_START_WORLD
2217 * profiler event handler.
2219 * Returns: a non-zero value if the GC doesn't support heap walking
2222 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
2227 hwi.callback = callback;
2230 sgen_clear_nursery_fragments ();
2231 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data, walk_references, &hwi, FALSE, TRUE);
2233 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, walk_references, &hwi);
2234 sgen_los_iterate_objects (walk_references, &hwi);
2244 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
2246 gc_callbacks = *callbacks;
2250 mono_gc_get_gc_callbacks ()
2252 return &gc_callbacks;
2256 sgen_client_thread_register (SgenThreadInfo* info, void *stack_bottom_fallback)
2259 guint8 *staddr = NULL;
2261 #ifndef HAVE_KW_THREAD
2262 g_assert (!mono_native_tls_get_value (thread_info_key));
2263 mono_native_tls_set_value (thread_info_key, info);
2265 sgen_thread_info = info;
2268 info->client_info.skip = 0;
2270 info->client_info.stack_start = NULL;
2272 #ifdef SGEN_POSIX_STW
2273 info->client_info.stop_count = -1;
2274 info->client_info.signal = 0;
2277 mono_thread_info_get_stack_bounds (&staddr, &stsize);
2279 info->client_info.stack_start_limit = staddr;
2280 info->client_info.stack_end = staddr + stsize;
2282 gsize stack_bottom = (gsize)stack_bottom_fallback;
2283 stack_bottom += 4095;
2284 stack_bottom &= ~4095;
2285 info->client_info.stack_end = (char*)stack_bottom;
2288 memset (&info->client_info.ctx, 0, sizeof (MonoContext));
2290 if (mono_gc_get_gc_callbacks ()->thread_attach_func)
2291 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2293 binary_protocol_thread_register ((gpointer)mono_thread_info_get_tid (info));
2295 SGEN_LOG (3, "registered thread %p (%p) stack end %p", info, (gpointer)mono_thread_info_get_tid (info), info->client_info.stack_end);
2297 info->client_info.info.handle_stack = mono_handle_stack_alloc ();
2301 sgen_client_thread_unregister (SgenThreadInfo *p)
2303 MonoNativeThreadId tid;
2305 #ifndef HAVE_KW_THREAD
2306 mono_native_tls_set_value (thread_info_key, NULL);
2308 sgen_thread_info = NULL;
2311 tid = mono_thread_info_get_tid (p);
2313 if (p->client_info.info.runtime_thread)
2314 mono_threads_add_joinable_thread ((gpointer)tid);
2316 if (mono_gc_get_gc_callbacks ()->thread_detach_func) {
2317 mono_gc_get_gc_callbacks ()->thread_detach_func (p->client_info.runtime_data);
2318 p->client_info.runtime_data = NULL;
2321 binary_protocol_thread_unregister ((gpointer)tid);
2322 SGEN_LOG (3, "unregister thread %p (%p)", p, (gpointer)tid);
2324 HandleStack *handles = (HandleStack*) p->client_info.info.handle_stack;
2325 p->client_info.info.handle_stack = NULL;
2326 mono_handle_stack_free (handles);
2330 mono_gc_set_skip_thread (gboolean skip)
2332 SgenThreadInfo *info = mono_thread_info_current ();
2335 info->client_info.gc_disabled = skip;
2340 thread_in_critical_region (SgenThreadInfo *info)
2342 return info->client_info.in_critical_region;
2346 sgen_thread_attach (SgenThreadInfo *info)
2348 if (mono_gc_get_gc_callbacks ()->thread_attach_func && !info->client_info.runtime_data)
2349 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2353 sgen_thread_detach (SgenThreadInfo *p)
2355 /* If a delegate is passed to native code and invoked on a thread we dont
2356 * know about, marshal will register it with mono_threads_attach_coop, but
2357 * we have no way of knowing when that thread goes away. SGen has a TSD
2358 * so we assume that if the domain is still registered, we can detach
2361 if (mono_thread_internal_current_is_attached ())
2362 mono_thread_detach_internal (mono_thread_internal_current ());
2366 mono_gc_register_thread (void *baseptr)
2368 return mono_thread_info_attach (baseptr) != NULL;
2372 mono_gc_is_gc_thread (void)
2376 result = mono_thread_info_current () != NULL;
2382 sgen_client_thread_register_worker (void)
2384 mono_thread_info_register_small_id ();
2385 mono_native_thread_set_name (mono_native_thread_id_get (), "SGen worker");
2388 /* Variables holding start/end nursery so it won't have to be passed at every call */
2389 static void *scan_area_arg_start, *scan_area_arg_end;
2392 mono_gc_conservatively_scan_area (void *start, void *end)
2394 sgen_conservatively_pin_objects_from ((void **)start, (void **)end, scan_area_arg_start, scan_area_arg_end, PIN_TYPE_STACK);
2398 mono_gc_scan_object (void *obj, void *gc_data)
2400 ScanCopyContext *ctx = (ScanCopyContext *)gc_data;
2401 ctx->ops->copy_or_mark_object ((GCObject**)&obj, ctx->queue);
2406 * Mark from thread stacks and registers.
2409 sgen_client_scan_thread_data (void *start_nursery, void *end_nursery, gboolean precise, ScanCopyContext ctx)
2411 scan_area_arg_start = start_nursery;
2412 scan_area_arg_end = end_nursery;
2414 FOREACH_THREAD (info) {
2415 int skip_reason = 0;
2416 void *aligned_stack_start;
2418 if (info->client_info.skip) {
2419 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);
2421 } else if (info->client_info.gc_disabled) {
2422 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);
2424 } else if (!mono_thread_info_is_live (info)) {
2425 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);
2427 } else if (!info->client_info.stack_start) {
2428 SGEN_LOG (3, "Skipping starting or detaching thread %p", info);
2432 binary_protocol_scan_stack ((gpointer)mono_thread_info_get_tid (info), info->client_info.stack_start, info->client_info.stack_end, skip_reason);
2437 g_assert (info->client_info.stack_start);
2438 g_assert (info->client_info.stack_end);
2440 aligned_stack_start = (void*)(mword) ALIGN_TO ((mword)info->client_info.stack_start, SIZEOF_VOID_P);
2442 /* Windows uses a guard page before the committed stack memory pages to detect when the
2443 stack needs to be grown. If we suspend a thread just after a function prolog has
2444 decremented the stack pointer to point into the guard page but before the thread has
2445 been able to read or write to that page, starting the stack scan at aligned_stack_start
2446 will raise a STATUS_GUARD_PAGE_VIOLATION and the process will crash. This code uses
2447 VirtualQuery() to determine whether stack_start points into the guard page and then
2448 updates aligned_stack_start to point at the next non-guard page. */
2449 MEMORY_BASIC_INFORMATION mem_info;
2450 SIZE_T result = VirtualQuery(info->client_info.stack_start, &mem_info, sizeof(mem_info));
2451 g_assert (result != 0);
2452 if (mem_info.Protect & PAGE_GUARD) {
2453 aligned_stack_start = ((char*) mem_info.BaseAddress) + mem_info.RegionSize;
2457 g_assert (info->client_info.suspend_done);
2458 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 ());
2459 if (mono_gc_get_gc_callbacks ()->thread_mark_func && !conservative_stack_mark) {
2460 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);
2461 } else if (!precise) {
2462 if (!conservative_stack_mark) {
2463 fprintf (stderr, "Precise stack mark not supported - disabling.\n");
2464 conservative_stack_mark = TRUE;
2466 //FIXME we should eventually use the new stack_mark from coop
2467 sgen_conservatively_pin_objects_from ((void **)aligned_stack_start, (void **)info->client_info.stack_end, start_nursery, end_nursery, PIN_TYPE_STACK);
2471 sgen_conservatively_pin_objects_from ((void**)&info->client_info.ctx, (void**)(&info->client_info.ctx + 1),
2472 start_nursery, end_nursery, PIN_TYPE_STACK);
2475 // This is used on Coop GC for platforms where we cannot get the data for individual registers.
2476 // We force a spill of all registers into the stack and pass a chunk of data into sgen.
2477 //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
2478 MonoThreadUnwindState *state = &info->client_info.info.thread_saved_state [SELF_SUSPEND_STATE_INDEX];
2479 if (state && state->gc_stackdata) {
2480 sgen_conservatively_pin_objects_from ((void **)state->gc_stackdata, (void**)((char*)state->gc_stackdata + state->gc_stackdata_size),
2481 start_nursery, end_nursery, PIN_TYPE_STACK);
2485 if (precise && info->client_info.info.handle_stack) {
2486 mono_handle_stack_scan ((HandleStack*)info->client_info.info.handle_stack, (GcScanFunc)ctx.ops->copy_or_mark_object, ctx.queue);
2488 } FOREACH_THREAD_END
2492 * mono_gc_set_stack_end:
2494 * Set the end of the current threads stack to STACK_END. The stack space between
2495 * STACK_END and the real end of the threads stack will not be scanned during collections.
2498 mono_gc_set_stack_end (void *stack_end)
2500 SgenThreadInfo *info;
2503 info = mono_thread_info_current ();
2505 SGEN_ASSERT (0, stack_end < info->client_info.stack_end, "Can only lower stack end");
2506 info->client_info.stack_end = stack_end;
2516 mono_gc_register_root (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2518 return sgen_register_root (start, size, descr, descr ? ROOT_TYPE_NORMAL : ROOT_TYPE_PINNED, source, msg);
2522 mono_gc_register_root_wbarrier (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2524 return sgen_register_root (start, size, descr, ROOT_TYPE_WBARRIER, source, msg);
2528 mono_gc_deregister_root (char* addr)
2530 sgen_deregister_root (addr);
2539 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
2541 return pthread_create (new_thread, attr, start_routine, arg);
2550 sgen_client_total_allocated_heap_changed (size_t allocated_heap)
2552 mono_runtime_resource_check_limit (MONO_RESOURCE_GC_HEAP, allocated_heap);
2556 mono_gc_user_markers_supported (void)
2562 mono_object_is_alive (MonoObject* o)
2568 mono_gc_get_generation (MonoObject *obj)
2570 if (sgen_ptr_in_nursery (obj))
2576 mono_gc_get_gc_name (void)
2582 mono_gc_get_description (void)
2584 #ifdef HAVE_CONC_GC_AS_DEFAULT
2585 return g_strdup ("sgen (concurrent by default)");
2587 return g_strdup ("sgen");
2592 mono_gc_set_desktop_mode (void)
2597 mono_gc_is_moving (void)
2603 mono_gc_is_disabled (void)
2609 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
2616 mono_gc_max_generation (void)
2622 mono_gc_precise_stack_mark_enabled (void)
2624 return !conservative_stack_mark;
2628 mono_gc_collect (int generation)
2630 sgen_gc_collect (generation);
2634 mono_gc_collection_count (int generation)
2636 return sgen_gc_collection_count (generation);
2640 mono_gc_get_used_size (void)
2642 return (int64_t)sgen_gc_get_used_size ();
2646 mono_gc_get_heap_size (void)
2648 return (int64_t)sgen_gc_get_total_heap_allocation ();
2652 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
2654 return sgen_make_user_root_descriptor (marker);
2658 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
2660 return SGEN_DESC_STRING;
2664 mono_gc_get_nursery (int *shift_bits, size_t *size)
2666 *size = sgen_nursery_size;
2667 *shift_bits = DEFAULT_NURSERY_BITS;
2668 return sgen_get_nursery_start ();
2672 mono_gc_get_los_limit (void)
2674 return SGEN_MAX_SMALL_OBJ_SIZE;
2678 sgen_client_default_metadata (void)
2680 return mono_domain_get ();
2684 sgen_client_metadata_for_object (GCObject *obj)
2686 return mono_object_domain (obj);
2690 * mono_gchandle_is_in_domain:
2691 * @gchandle: a GCHandle's handle.
2692 * @domain: An application domain.
2694 * Returns: TRUE if the object wrapped by the @gchandle belongs to the specific @domain.
2697 mono_gchandle_is_in_domain (guint32 gchandle, MonoDomain *domain)
2699 MonoDomain *gchandle_domain = (MonoDomain *)sgen_gchandle_get_metadata (gchandle);
2700 return domain->domain_id == gchandle_domain->domain_id;
2704 * mono_gchandle_free_domain:
2705 * @unloading: domain that is unloading
2707 * Function used internally to cleanup any GC handle for objects belonging
2708 * to the specified domain during appdomain unload.
2711 mono_gchandle_free_domain (MonoDomain *unloading)
2716 null_link_if_in_domain (gpointer hidden, GCHandleType handle_type, int max_generation, gpointer user)
2718 MonoDomain *unloading_domain = (MonoDomain *)user;
2719 MonoDomain *obj_domain;
2720 gboolean is_weak = MONO_GC_HANDLE_TYPE_IS_WEAK (handle_type);
2721 if (MONO_GC_HANDLE_IS_OBJECT_POINTER (hidden)) {
2722 MonoObject *obj = (MonoObject *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2723 obj_domain = mono_object_domain (obj);
2725 obj_domain = (MonoDomain *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2727 if (unloading_domain->domain_id == obj_domain->domain_id)
2733 sgen_null_links_for_domain (MonoDomain *domain)
2736 for (type = HANDLE_TYPE_MIN; type < HANDLE_TYPE_MAX; ++type)
2737 sgen_gchandle_iterate ((GCHandleType)type, GENERATION_OLD, null_link_if_in_domain, domain);
2741 mono_gchandle_set_target (guint32 gchandle, MonoObject *obj)
2743 sgen_gchandle_set_target (gchandle, obj);
2747 sgen_client_gchandle_created (int handle_type, GCObject *obj, guint32 handle)
2749 #ifndef DISABLE_PERFCOUNTERS
2750 mono_perfcounters->gc_num_handles++;
2752 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_CREATED, handle_type, handle, obj);
2756 sgen_client_gchandle_destroyed (int handle_type, guint32 handle)
2758 #ifndef DISABLE_PERFCOUNTERS
2759 mono_perfcounters->gc_num_handles--;
2761 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_DESTROYED, handle_type, handle, NULL);
2765 sgen_client_ensure_weak_gchandles_accessible (void)
2768 * During the second bridge processing step the world is
2769 * running again. That step processes all weak links once
2770 * more to null those that refer to dead objects. Before that
2771 * is completed, those links must not be followed, so we
2772 * conservatively wait for bridge processing when any weak
2773 * link is dereferenced.
2775 /* FIXME: A GC can occur after this check fails, in which case we
2776 * should wait for bridge processing but would fail to do so.
2778 if (G_UNLIKELY (bridge_processing_in_progress))
2779 mono_gc_wait_for_bridge_processing ();
2783 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
2787 result = func (data);
2788 UNLOCK_INTERRUPTION;
2793 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
2799 mono_gc_get_card_table (int *shift_bits, gpointer *mask)
2801 return sgen_get_card_table_configuration (shift_bits, mask);
2805 mono_gc_card_table_nursery_check (void)
2807 return !sgen_get_major_collector ()->is_concurrent;
2810 /* Negative value to remove */
2812 mono_gc_add_memory_pressure (gint64 value)
2814 /* FIXME: Implement at some point? */
2822 sgen_client_degraded_allocation (size_t size)
2824 static int last_major_gc_warned = -1;
2825 static int num_degraded = 0;
2827 if (last_major_gc_warned < (int)gc_stats.major_gc_count) {
2829 if (num_degraded == 1 || num_degraded == 3)
2830 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Degraded allocation. Consider increasing nursery-size if the warning persists.");
2831 else if (num_degraded == 10)
2832 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Repeated degraded allocation. Consider increasing nursery-size.");
2833 last_major_gc_warned = gc_stats.major_gc_count;
2842 sgen_client_description_for_internal_mem_type (int type)
2845 case INTERNAL_MEM_EPHEMERON_LINK: return "ephemeron-link";
2846 case INTERNAL_MEM_MOVED_OBJECT: return "moved-object";
2853 sgen_client_pre_collection_checks (void)
2855 if (sgen_mono_xdomain_checks) {
2856 sgen_clear_nursery_fragments ();
2857 sgen_check_for_xdomain_refs ();
2862 sgen_client_vtable_is_inited (MonoVTable *vt)
2864 return vt->klass->inited;
2868 sgen_client_vtable_get_namespace (MonoVTable *vt)
2870 return vt->klass->name_space;
2874 sgen_client_vtable_get_name (MonoVTable *vt)
2876 return vt->klass->name;
2884 sgen_client_init (void)
2887 MonoThreadInfoCallbacks cb;
2889 cb.thread_register = sgen_thread_register;
2890 cb.thread_detach = sgen_thread_detach;
2891 cb.thread_unregister = sgen_thread_unregister;
2892 cb.thread_attach = sgen_thread_attach;
2893 cb.mono_thread_in_critical_region = thread_in_critical_region;
2894 cb.ip_in_critical_region = ip_in_critical_region;
2896 mono_threads_init (&cb, sizeof (SgenThreadInfo));
2898 ///* Keep this the default for now */
2899 /* Precise marking is broken on all supported targets. Disable until fixed. */
2900 conservative_stack_mark = TRUE;
2902 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_EPHEMERON_LINK, sizeof (EphemeronLinkNode));
2904 mono_sgen_init_stw ();
2906 #ifndef HAVE_KW_THREAD
2907 mono_native_tls_alloc (&thread_info_key, NULL);
2908 #if defined(TARGET_OSX) || defined(TARGET_WIN32) || defined(TARGET_ANDROID) || defined(TARGET_IOS)
2910 * CEE_MONO_TLS requires the tls offset, not the key, so the code below only works on darwin,
2911 * where the two are the same.
2913 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO, thread_info_key);
2917 int tls_offset = -1;
2918 MONO_THREAD_VAR_OFFSET (sgen_thread_info, tls_offset);
2919 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO, tls_offset);
2923 mono_gc_register_thread (&dummy);
2927 sgen_client_handle_gc_param (const char *opt)
2929 if (g_str_has_prefix (opt, "stack-mark=")) {
2930 opt = strchr (opt, '=') + 1;
2931 if (!strcmp (opt, "precise")) {
2932 conservative_stack_mark = FALSE;
2933 } else if (!strcmp (opt, "conservative")) {
2934 conservative_stack_mark = TRUE;
2936 sgen_env_var_error (MONO_GC_PARAMS_NAME, conservative_stack_mark ? "Using `conservative`." : "Using `precise`.",
2937 "Invalid value `%s` for `stack-mark` option, possible values are: `precise`, `conservative`.", opt);
2939 } else if (g_str_has_prefix (opt, "bridge-implementation=")) {
2940 opt = strchr (opt, '=') + 1;
2941 sgen_set_bridge_implementation (opt);
2942 } else if (g_str_has_prefix (opt, "toggleref-test")) {
2943 /* FIXME: This should probably in MONO_GC_DEBUG */
2944 sgen_register_test_toggleref_callback ();
2945 } else if (!sgen_bridge_handle_gc_param (opt)) {
2952 sgen_client_print_gc_params_usage (void)
2954 fprintf (stderr, " stack-mark=MARK-METHOD (where MARK-METHOD is 'precise' or 'conservative')\n");
2958 sgen_client_handle_gc_debug (const char *opt)
2960 if (!strcmp (opt, "xdomain-checks")) {
2961 sgen_mono_xdomain_checks = TRUE;
2962 } else if (!strcmp (opt, "do-not-finalize")) {
2963 mono_do_not_finalize = TRUE;
2964 } else if (g_str_has_prefix (opt, "do-not-finalize=")) {
2965 opt = strchr (opt, '=') + 1;
2966 mono_do_not_finalize = TRUE;
2967 mono_do_not_finalize_class_names = g_strsplit (opt, ",", 0);
2968 } else if (!strcmp (opt, "log-finalizers")) {
2969 log_finalizers = TRUE;
2970 } else if (!strcmp (opt, "no-managed-allocator")) {
2971 sgen_set_use_managed_allocator (FALSE);
2972 } else if (!sgen_bridge_handle_gc_debug (opt)) {
2979 sgen_client_print_gc_debug_usage (void)
2981 fprintf (stderr, " xdomain-checks\n");
2982 fprintf (stderr, " do-not-finalize\n");
2983 fprintf (stderr, " log-finalizers\n");
2984 fprintf (stderr, " no-managed-allocator\n");
2985 sgen_bridge_print_gc_debug_usage ();
2990 sgen_client_get_provenance (void)
2992 #ifdef SGEN_OBJECT_PROVENANCE
2993 MonoGCCallbacks *cb = mono_gc_get_gc_callbacks ();
2994 gpointer (*get_provenance_func) (void);
2997 get_provenance_func = cb->get_provenance_func;
2998 if (get_provenance_func)
2999 return get_provenance_func ();
3007 sgen_client_describe_invalid_pointer (GCObject *ptr)
3009 sgen_bridge_describe_pointer (ptr);
3012 static gboolean gc_inited;
3015 mono_gc_base_init (void)
3020 mono_counters_init ();
3023 mono_w32handle_init ();
3026 #ifdef HEAVY_STATISTICS
3027 mono_counters_register ("los marked cards", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_marked_cards);
3028 mono_counters_register ("los array cards scanned ", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_cards);
3029 mono_counters_register ("los array remsets", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_remsets);
3031 mono_counters_register ("WBarrier set arrayref", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_set_arrayref);
3032 mono_counters_register ("WBarrier value copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_value_copy);
3033 mono_counters_register ("WBarrier object copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_object_copy);
3038 #if defined(HAVE_KW_THREAD)
3039 /* This can happen with using libmonosgen.so */
3040 if (mono_tls_key_get_offset (TLS_KEY_SGEN_THREAD_INFO) == -1)
3041 sgen_set_use_managed_allocator (FALSE);
3048 mono_gc_base_cleanup (void)
3050 sgen_thread_pool_shutdown ();
3052 // We should have consumed any outstanding moves.
3053 g_assert (sgen_pointer_queue_is_empty (&moved_objects_queue));
3057 mono_gc_is_null (void)