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.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 mono_gc_is_critical_method (MonoMethod *method)
225 return sgen_is_critical_method (method);
231 emit_nursery_check (MonoMethodBuilder *mb, int *nursery_check_return_labels, gboolean is_concurrent)
233 int shifted_nursery_start = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
235 memset (nursery_check_return_labels, 0, sizeof (int) * 2);
236 // if (ptr_in_nursery (ptr)) return;
238 * Masking out the bits might be faster, but we would have to use 64 bit
239 * immediates, which might be slower.
241 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
242 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_START);
243 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
244 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
245 mono_mb_emit_byte (mb, CEE_SHR_UN);
246 mono_mb_emit_stloc (mb, shifted_nursery_start);
248 mono_mb_emit_ldarg (mb, 0);
249 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
250 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
251 mono_mb_emit_byte (mb, CEE_SHR_UN);
252 mono_mb_emit_ldloc (mb, shifted_nursery_start);
253 nursery_check_return_labels [0] = mono_mb_emit_branch (mb, CEE_BEQ);
255 if (!is_concurrent) {
256 // if (!ptr_in_nursery (*ptr)) return;
257 mono_mb_emit_ldarg (mb, 0);
258 mono_mb_emit_byte (mb, CEE_LDIND_I);
259 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
260 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
261 mono_mb_emit_byte (mb, CEE_SHR_UN);
262 mono_mb_emit_ldloc (mb, shifted_nursery_start);
263 nursery_check_return_labels [1] = mono_mb_emit_branch (mb, CEE_BNE_UN);
269 mono_gc_get_specific_write_barrier (gboolean is_concurrent)
272 MonoMethodBuilder *mb;
273 MonoMethodSignature *sig;
274 MonoMethod **write_barrier_method_addr;
276 #ifdef MANAGED_WBARRIER
277 int i, nursery_check_labels [2];
280 // FIXME: Maybe create a separate version for ctors (the branch would be
281 // correctly predicted more times)
283 write_barrier_method_addr = &write_barrier_conc_method;
285 write_barrier_method_addr = &write_barrier_noconc_method;
287 if (*write_barrier_method_addr)
288 return *write_barrier_method_addr;
290 /* Create the IL version of mono_gc_barrier_generic_store () */
291 sig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
292 sig->ret = &mono_defaults.void_class->byval_arg;
293 sig->params [0] = &mono_defaults.int_class->byval_arg;
296 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_conc", MONO_WRAPPER_WRITE_BARRIER);
298 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_noconc", MONO_WRAPPER_WRITE_BARRIER);
301 #ifdef MANAGED_WBARRIER
302 emit_nursery_check (mb, nursery_check_labels, is_concurrent);
304 addr = sgen_cardtable + ((address >> CARD_BITS) & CARD_MASK)
308 LDC_PTR sgen_cardtable
314 if (SGEN_HAVE_OVERLAPPING_CARDS) {
315 LDC_PTR card_table_mask
322 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
323 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_CARD_TABLE);
324 mono_mb_emit_ldarg (mb, 0);
325 mono_mb_emit_icon (mb, CARD_BITS);
326 mono_mb_emit_byte (mb, CEE_SHR_UN);
327 mono_mb_emit_byte (mb, CEE_CONV_I);
328 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
329 #if SIZEOF_VOID_P == 8
330 mono_mb_emit_icon8 (mb, CARD_MASK);
332 mono_mb_emit_icon (mb, CARD_MASK);
334 mono_mb_emit_byte (mb, CEE_CONV_I);
335 mono_mb_emit_byte (mb, CEE_AND);
337 mono_mb_emit_byte (mb, CEE_ADD);
338 mono_mb_emit_icon (mb, 1);
339 mono_mb_emit_byte (mb, CEE_STIND_I1);
342 for (i = 0; i < 2; ++i) {
343 if (nursery_check_labels [i])
344 mono_mb_patch_branch (mb, nursery_check_labels [i]);
346 mono_mb_emit_byte (mb, CEE_RET);
348 mono_mb_emit_ldarg (mb, 0);
349 mono_mb_emit_icall (mb, mono_gc_wbarrier_generic_nostore);
350 mono_mb_emit_byte (mb, CEE_RET);
353 res = mono_mb_create_method (mb, sig, 16);
354 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
355 mono_marshal_set_wrapper_info (res, info);
359 if (*write_barrier_method_addr) {
360 /* Already created */
361 mono_free_method (res);
363 /* double-checked locking */
364 mono_memory_barrier ();
365 *write_barrier_method_addr = res;
369 return *write_barrier_method_addr;
373 mono_gc_get_write_barrier (void)
375 return mono_gc_get_specific_write_barrier (major_collector.is_concurrent);
379 * Dummy filler objects
382 /* Vtable of the objects used to fill out nursery fragments before a collection */
383 static GCVTable array_fill_vtable;
386 get_array_fill_vtable (void)
388 if (!array_fill_vtable) {
389 static MonoClass klass;
390 static char _vtable[sizeof(MonoVTable)+8];
391 MonoVTable* vtable = (MonoVTable*) ALIGN_TO((mword)_vtable, 8);
394 MonoDomain *domain = mono_get_root_domain ();
397 klass.element_class = mono_defaults.byte_class;
399 klass.instance_size = MONO_SIZEOF_MONO_ARRAY;
400 klass.sizes.element_size = 1;
401 klass.size_inited = 1;
402 klass.name = "array_filler_type";
404 vtable->klass = &klass;
406 vtable->gc_descr = mono_gc_make_descr_for_array (TRUE, &bmap, 0, 1);
409 array_fill_vtable = vtable;
411 return array_fill_vtable;
415 sgen_client_array_fill_range (char *start, size_t size)
419 if (size < MONO_SIZEOF_MONO_ARRAY) {
420 memset (start, 0, size);
424 o = (MonoArray*)start;
425 o->obj.vtable = (MonoVTable*)get_array_fill_vtable ();
426 /* Mark this as not a real object */
427 o->obj.synchronisation = (MonoThreadsSync *)GINT_TO_POINTER (-1);
429 o->max_length = (mono_array_size_t)(size - MONO_SIZEOF_MONO_ARRAY);
435 sgen_client_zero_array_fill_header (void *p, size_t size)
437 if (size >= MONO_SIZEOF_MONO_ARRAY) {
438 memset (p, 0, MONO_SIZEOF_MONO_ARRAY);
440 static guint8 zeros [MONO_SIZEOF_MONO_ARRAY];
442 SGEN_ASSERT (0, !memcmp (p, zeros, size), "TLAB segment must be zeroed out.");
450 static MonoGCFinalizerCallbacks fin_callbacks;
453 mono_gc_get_vtable_bits (MonoClass *klass)
456 /* FIXME move this to the bridge code */
457 if (sgen_need_bridge_processing ()) {
458 switch (sgen_bridge_class_kind (klass)) {
459 case GC_BRIDGE_TRANSPARENT_BRIDGE_CLASS:
460 case GC_BRIDGE_OPAQUE_BRIDGE_CLASS:
461 res = SGEN_GC_BIT_BRIDGE_OBJECT;
463 case GC_BRIDGE_OPAQUE_CLASS:
464 res = SGEN_GC_BIT_BRIDGE_OPAQUE_OBJECT;
466 case GC_BRIDGE_TRANSPARENT_CLASS:
470 if (fin_callbacks.is_class_finalization_aware) {
471 if (fin_callbacks.is_class_finalization_aware (klass))
472 res |= SGEN_GC_BIT_FINALIZER_AWARE;
478 is_finalization_aware (MonoObject *obj)
480 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
481 return (vt->gc_bits & SGEN_GC_BIT_FINALIZER_AWARE) == SGEN_GC_BIT_FINALIZER_AWARE;
485 sgen_client_object_queued_for_finalization (GCObject *obj)
487 if (fin_callbacks.object_queued_for_finalization && is_finalization_aware (obj))
488 fin_callbacks.object_queued_for_finalization (obj);
491 if (G_UNLIKELY (MONO_GC_FINALIZE_ENQUEUE_ENABLED ())) {
492 int gen = sgen_ptr_in_nursery (obj) ? GENERATION_NURSERY : GENERATION_OLD;
493 GCVTable vt = SGEN_LOAD_VTABLE (obj);
494 MONO_GC_FINALIZE_ENQUEUE ((mword)obj, sgen_safe_object_get_size (obj),
495 sgen_client_vtable_get_namespace (vt), sgen_client_vtable_get_name (vt), gen,
496 sgen_client_object_has_critical_finalizer (obj));
502 mono_gc_register_finalizer_callbacks (MonoGCFinalizerCallbacks *callbacks)
504 if (callbacks->version != MONO_GC_FINALIZER_EXTENSION_VERSION)
505 g_error ("Invalid finalizer callback version. Expected %d but got %d\n", MONO_GC_FINALIZER_EXTENSION_VERSION, callbacks->version);
507 fin_callbacks = *callbacks;
511 sgen_client_run_finalize (MonoObject *obj)
513 mono_gc_run_finalize (obj, NULL);
517 * mono_gc_invoke_finalizers:
520 mono_gc_invoke_finalizers (void)
522 return sgen_gc_invoke_finalizers ();
526 * mono_gc_pending_finalizers:
529 mono_gc_pending_finalizers (void)
531 return sgen_have_pending_finalizers ();
535 sgen_client_finalize_notify (void)
537 mono_gc_finalize_notify ();
541 mono_gc_register_for_finalization (MonoObject *obj, void *user_data)
543 sgen_object_register_for_finalization (obj, user_data);
547 object_in_domain_predicate (MonoObject *obj, void *user_data)
549 MonoDomain *domain = (MonoDomain *)user_data;
550 if (mono_object_domain (obj) == domain) {
551 SGEN_LOG (5, "Unregistering finalizer for object: %p (%s)", obj, sgen_client_vtable_get_name (SGEN_LOAD_VTABLE (obj)));
558 * mono_gc_finalizers_for_domain:
559 * \param domain the unloading appdomain
560 * \param out_array output array
561 * \param out_size size of output array
562 * Enqueue for finalization all objects that belong to the unloading appdomain \p domain.
563 * \p suspend is used for early termination of the enqueuing process.
566 mono_gc_finalize_domain (MonoDomain *domain)
568 sgen_finalize_if (object_in_domain_predicate, domain);
572 mono_gc_suspend_finalizers (void)
574 sgen_set_suspend_finalizers ();
581 typedef struct _EphemeronLinkNode EphemeronLinkNode;
583 struct _EphemeronLinkNode {
584 EphemeronLinkNode *next;
593 static EphemeronLinkNode *ephemeron_list;
595 /* LOCKING: requires that the GC lock is held */
597 null_ephemerons_for_domain (MonoDomain *domain)
599 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
602 MonoObject *object = (MonoObject*)current->array;
605 SGEN_ASSERT (0, object->vtable, "Can't have objects without vtables.");
607 if (object && object->vtable->domain == domain) {
608 EphemeronLinkNode *tmp = current;
611 prev->next = current->next;
613 ephemeron_list = current->next;
615 current = current->next;
616 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
619 current = current->next;
624 /* LOCKING: requires that the GC lock is held */
626 sgen_client_clear_unreachable_ephemerons (ScanCopyContext ctx)
628 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
629 SgenGrayQueue *queue = ctx.queue;
630 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
631 Ephemeron *cur, *array_end;
635 MonoArray *array = current->array;
637 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
638 EphemeronLinkNode *tmp = current;
640 SGEN_LOG (5, "Dead Ephemeron array at %p", array);
643 prev->next = current->next;
645 ephemeron_list = current->next;
647 current = current->next;
648 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
653 copy_func ((GCObject**)&array, queue);
654 current->array = array;
656 SGEN_LOG (5, "Clearing unreachable entries for ephemeron array at %p", array);
658 cur = mono_array_addr (array, Ephemeron, 0);
659 array_end = cur + mono_array_length_fast (array);
660 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
662 for (; cur < array_end; ++cur) {
663 GCObject *key = cur->key;
665 if (!key || key == tombstone)
668 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
669 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
670 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
672 if (!sgen_is_object_alive_for_current_gen (key)) {
673 cur->key = tombstone;
679 current = current->next;
684 LOCKING: requires that the GC lock is held
686 Limitations: We scan all ephemerons on every collection since the current design doesn't allow for a simple nursery/mature split.
689 sgen_client_mark_ephemerons (ScanCopyContext ctx)
691 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
692 SgenGrayQueue *queue = ctx.queue;
693 gboolean nothing_marked = TRUE;
694 EphemeronLinkNode *current = ephemeron_list;
695 Ephemeron *cur, *array_end;
698 for (current = ephemeron_list; current; current = current->next) {
699 MonoArray *array = current->array;
700 SGEN_LOG (5, "Ephemeron array at %p", array);
702 /*It has to be alive*/
703 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
704 SGEN_LOG (5, "\tnot reachable");
708 copy_func ((GCObject**)&array, queue);
710 cur = mono_array_addr (array, Ephemeron, 0);
711 array_end = cur + mono_array_length_fast (array);
712 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
714 for (; cur < array_end; ++cur) {
715 GCObject *key = cur->key;
717 if (!key || key == tombstone)
720 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
721 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
722 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
724 if (sgen_is_object_alive_for_current_gen (key)) {
725 GCObject *value = cur->value;
727 copy_func (&cur->key, queue);
729 if (!sgen_is_object_alive_for_current_gen (value))
730 nothing_marked = FALSE;
731 copy_func (&cur->value, queue);
737 SGEN_LOG (5, "Ephemeron run finished. Is it done %d", nothing_marked);
738 return nothing_marked;
742 mono_gc_ephemeron_array_add (MonoObject *obj)
744 EphemeronLinkNode *node;
748 node = (EphemeronLinkNode *)sgen_alloc_internal (INTERNAL_MEM_EPHEMERON_LINK);
753 node->array = (MonoArray*)obj;
754 node->next = ephemeron_list;
755 ephemeron_list = node;
757 SGEN_LOG (5, "Registered ephemeron array %p", obj);
768 need_remove_object_for_domain (GCObject *start, MonoDomain *domain)
770 if (mono_object_domain (start) == domain) {
771 SGEN_LOG (4, "Need to cleanup object %p", start);
772 binary_protocol_cleanup (start, (gpointer)SGEN_LOAD_VTABLE (start), sgen_safe_object_get_size ((GCObject*)start));
779 process_object_for_domain_clearing (GCObject *start, MonoDomain *domain)
781 MonoVTable *vt = SGEN_LOAD_VTABLE (start);
782 if (vt->klass == mono_defaults.internal_thread_class)
783 g_assert (mono_object_domain (start) == mono_get_root_domain ());
784 /* The object could be a proxy for an object in the domain
786 #ifndef DISABLE_REMOTING
787 if (mono_defaults.real_proxy_class->supertypes && mono_class_has_parent_fast (vt->klass, mono_defaults.real_proxy_class)) {
788 MonoObject *server = ((MonoRealProxy*)start)->unwrapped_server;
790 /* The server could already have been zeroed out, so
791 we need to check for that, too. */
792 if (server && (!SGEN_LOAD_VTABLE (server) || mono_object_domain (server) == domain)) {
793 SGEN_LOG (4, "Cleaning up remote pointer in %p to object %p", start, server);
794 ((MonoRealProxy*)start)->unwrapped_server = NULL;
801 clear_domain_process_object (GCObject *obj, MonoDomain *domain)
805 process_object_for_domain_clearing (obj, domain);
806 remove = need_remove_object_for_domain (obj, domain);
808 if (remove && obj->synchronisation) {
809 guint32 dislink = mono_monitor_get_object_monitor_gchandle (obj);
811 mono_gchandle_free (dislink);
818 clear_domain_process_minor_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
820 if (clear_domain_process_object (obj, domain)) {
821 CANARIFY_SIZE (size);
822 memset (obj, 0, size);
827 clear_domain_process_major_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
829 clear_domain_process_object (obj, domain);
833 clear_domain_free_major_non_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
835 if (need_remove_object_for_domain (obj, domain))
836 major_collector.free_non_pinned_object (obj, size);
840 clear_domain_free_major_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
842 if (need_remove_object_for_domain (obj, domain))
843 major_collector.free_pinned_object (obj, size);
847 * When appdomains are unloaded we can easily remove objects that have finalizers,
848 * but all the others could still be present in random places on the heap.
849 * We need a sweep to get rid of them even though it's going to be costly
851 * The reason we need to remove them is because we access the vtable and class
852 * structures to know the object size and the reference bitmap: once the domain is
853 * unloaded the point to random memory.
856 mono_gc_clear_domain (MonoDomain * domain)
858 LOSObject *bigobj, *prev;
863 binary_protocol_domain_unload_begin (domain);
867 if (sgen_concurrent_collection_in_progress ())
868 sgen_perform_collection (0, GENERATION_OLD, "clear domain", TRUE, FALSE);
869 SGEN_ASSERT (0, !sgen_concurrent_collection_in_progress (), "We just ordered a synchronous collection. Why are we collecting concurrently?");
871 major_collector.finish_sweeping ();
873 sgen_process_fin_stage_entries ();
875 sgen_clear_nursery_fragments ();
877 FOREACH_THREAD (info) {
878 mono_handle_stack_free_domain ((HandleStack*)info->client_info.info.handle_stack, domain);
881 if (sgen_mono_xdomain_checks && domain != mono_get_root_domain ()) {
882 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_NORMAL);
883 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_WBARRIER);
884 sgen_check_for_xdomain_refs ();
887 /*Ephemerons and dislinks must be processed before LOS since they might end up pointing
888 to memory returned to the OS.*/
889 null_ephemerons_for_domain (domain);
890 sgen_null_links_for_domain (domain);
892 for (i = GENERATION_NURSERY; i < GENERATION_MAX; ++i)
893 sgen_remove_finalizers_if (object_in_domain_predicate, domain, i);
895 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
896 (IterateObjectCallbackFunc)clear_domain_process_minor_object_callback, domain, FALSE, TRUE);
898 /* We need two passes over major and large objects because
899 freeing such objects might give their memory back to the OS
900 (in the case of large objects) or obliterate its vtable
901 (pinned objects with major-copying or pinned and non-pinned
902 objects with major-mark&sweep), but we might need to
903 dereference a pointer from an object to another object if
904 the first object is a proxy. */
905 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, (IterateObjectCallbackFunc)clear_domain_process_major_object_callback, domain);
906 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
907 clear_domain_process_object ((GCObject*)bigobj->data, domain);
910 for (bigobj = los_object_list; bigobj;) {
911 if (need_remove_object_for_domain ((GCObject*)bigobj->data, domain)) {
912 LOSObject *to_free = bigobj;
914 prev->next = bigobj->next;
916 los_object_list = bigobj->next;
917 bigobj = bigobj->next;
918 SGEN_LOG (4, "Freeing large object %p", bigobj->data);
919 sgen_los_free_object (to_free);
923 bigobj = bigobj->next;
925 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_NON_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_non_pinned_object_callback, domain);
926 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_pinned_object_callback, domain);
928 if (domain == mono_get_root_domain ()) {
929 sgen_pin_stats_report ();
930 sgen_object_layout_dump (stdout);
933 sgen_restart_world (0);
935 binary_protocol_domain_unload_end (domain);
936 binary_protocol_flush_buffers (FALSE);
946 mono_gc_alloc_obj (MonoVTable *vtable, size_t size)
948 MonoObject *obj = sgen_alloc_obj (vtable, size);
950 if (G_UNLIKELY (mono_profiler_allocations_enabled ()) && obj)
951 MONO_PROFILER_RAISE (gc_allocation, (obj));
957 mono_gc_alloc_pinned_obj (MonoVTable *vtable, size_t size)
959 MonoObject *obj = sgen_alloc_obj_pinned (vtable, size);
961 if (G_UNLIKELY (mono_profiler_allocations_enabled ()) && obj)
962 MONO_PROFILER_RAISE (gc_allocation, (obj));
968 mono_gc_alloc_mature (MonoVTable *vtable, size_t size)
970 MonoObject *obj = sgen_alloc_obj_mature (vtable, size);
972 if (G_UNLIKELY (mono_profiler_allocations_enabled ()) && obj)
973 MONO_PROFILER_RAISE (gc_allocation, (obj));
979 * mono_gc_alloc_fixed:
982 mono_gc_alloc_fixed (size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
984 /* FIXME: do a single allocation */
985 void *res = g_calloc (1, size);
988 if (!mono_gc_register_root ((char *)res, size, descr, source, msg)) {
996 * mono_gc_free_fixed:
999 mono_gc_free_fixed (void* addr)
1001 mono_gc_deregister_root ((char *)addr);
1009 static MonoMethod* alloc_method_cache [ATYPE_NUM];
1010 static MonoMethod* slowpath_alloc_method_cache [ATYPE_NUM];
1011 static MonoMethod* profiler_alloc_method_cache [ATYPE_NUM];
1012 static gboolean use_managed_allocator = TRUE;
1014 #ifdef MANAGED_ALLOCATION
1015 // Cache the SgenThreadInfo pointer in a local 'var'.
1016 #define EMIT_TLS_ACCESS_VAR(mb, var) \
1018 var = mono_mb_add_local ((mb), &mono_defaults.int_class->byval_arg); \
1019 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1020 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1021 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1022 mono_mb_emit_stloc ((mb), (var)); \
1025 #define EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR(mb, var) \
1027 mono_mb_emit_ldloc ((mb), (var)); \
1028 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenClientThreadInfo, in_critical_region)); \
1029 mono_mb_emit_byte ((mb), CEE_ADD); \
1032 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb, var) do { \
1033 mono_mb_emit_ldloc ((mb), (var)); \
1034 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_next)); \
1035 mono_mb_emit_byte ((mb), CEE_ADD); \
1038 #define EMIT_TLS_ACCESS_TEMP_END(mb, var) do { \
1039 mono_mb_emit_ldloc ((mb), (var)); \
1040 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_temp_end)); \
1041 mono_mb_emit_byte ((mb), CEE_ADD); \
1042 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1045 /* FIXME: Do this in the JIT, where specialized allocation sequences can be created
1046 * for each class. This is currently not easy to do, as it is hard to generate basic
1047 * blocks + branches, but it is easy with the linear IL codebase.
1049 * For this to work we'd need to solve the TLAB race, first. Now we
1050 * require the allocator to be in a few known methods to make sure
1051 * that they are executed atomically via the restart mechanism.
1054 create_allocator (int atype, ManagedAllocatorVariant variant)
1056 int p_var, size_var, real_size_var, thread_var G_GNUC_UNUSED;
1057 gboolean slowpath = variant == MANAGED_ALLOCATOR_SLOW_PATH;
1058 gboolean profiler = variant == MANAGED_ALLOCATOR_PROFILER;
1059 guint32 fastpath_branch, max_size_branch, no_oom_branch;
1060 MonoMethodBuilder *mb;
1062 MonoMethodSignature *csig;
1063 static gboolean registered = FALSE;
1064 int tlab_next_addr_var, new_next_var;
1065 const char *name = NULL;
1070 mono_register_jit_icall (mono_gc_alloc_obj, "mono_gc_alloc_obj", mono_create_icall_signature ("object ptr int"), FALSE);
1071 mono_register_jit_icall (mono_gc_alloc_vector, "mono_gc_alloc_vector", mono_create_icall_signature ("object ptr int int"), FALSE);
1072 mono_register_jit_icall (mono_gc_alloc_string, "mono_gc_alloc_string", mono_create_icall_signature ("object ptr int int32"), FALSE);
1073 mono_register_jit_icall (mono_profiler_raise_gc_allocation, "mono_profiler_raise_gc_allocation", mono_create_icall_signature ("void object"), FALSE);
1077 if (atype == ATYPE_SMALL) {
1078 name = slowpath ? "SlowAllocSmall" : (profiler ? "ProfilerAllocSmall" : "AllocSmall");
1079 } else if (atype == ATYPE_NORMAL) {
1080 name = slowpath ? "SlowAlloc" : (profiler ? "ProfilerAlloc" : "Alloc");
1081 } else if (atype == ATYPE_VECTOR) {
1082 name = slowpath ? "SlowAllocVector" : (profiler ? "ProfilerAllocVector" : "AllocVector");
1083 } else if (atype == ATYPE_STRING) {
1084 name = slowpath ? "SlowAllocString" : (profiler ? "ProfilerAllocString" : "AllocString");
1086 g_assert_not_reached ();
1089 if (atype == ATYPE_NORMAL)
1094 csig = mono_metadata_signature_alloc (mono_defaults.corlib, num_params);
1095 if (atype == ATYPE_STRING) {
1096 csig->ret = &mono_defaults.string_class->byval_arg;
1097 csig->params [0] = &mono_defaults.int_class->byval_arg;
1098 csig->params [1] = &mono_defaults.int32_class->byval_arg;
1100 csig->ret = &mono_defaults.object_class->byval_arg;
1101 for (i = 0; i < num_params; i++)
1102 csig->params [i] = &mono_defaults.int_class->byval_arg;
1105 mb = mono_mb_new (mono_defaults.object_class, name, MONO_WRAPPER_ALLOC);
1112 mono_mb_emit_ldarg (mb, 0);
1113 mono_mb_emit_icall (mb, ves_icall_object_new_specific);
1116 mono_mb_emit_ldarg (mb, 0);
1117 mono_mb_emit_ldarg (mb, 1);
1118 mono_mb_emit_icall (mb, ves_icall_array_new_specific);
1121 mono_mb_emit_ldarg (mb, 1);
1122 mono_mb_emit_icall (mb, ves_icall_string_alloc);
1125 g_assert_not_reached ();
1132 * Tls access might call foreign code or code without jinfo. This can
1133 * only happen if we are outside of the critical region.
1135 EMIT_TLS_ACCESS_VAR (mb, thread_var);
1137 size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1138 if (atype == ATYPE_SMALL) {
1139 /* size_var = size_arg */
1140 mono_mb_emit_ldarg (mb, 1);
1141 mono_mb_emit_stloc (mb, size_var);
1142 } else if (atype == ATYPE_NORMAL) {
1143 /* size = vtable->klass->instance_size; */
1144 mono_mb_emit_ldarg (mb, 0);
1145 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1146 mono_mb_emit_byte (mb, CEE_ADD);
1147 mono_mb_emit_byte (mb, CEE_LDIND_I);
1148 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, instance_size));
1149 mono_mb_emit_byte (mb, CEE_ADD);
1150 /* FIXME: assert instance_size stays a 4 byte integer */
1151 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1152 mono_mb_emit_byte (mb, CEE_CONV_I);
1153 mono_mb_emit_stloc (mb, size_var);
1154 } else if (atype == ATYPE_VECTOR) {
1155 MonoExceptionClause *clause;
1156 int pos, pos_leave, pos_error;
1157 MonoClass *oom_exc_class;
1161 * n > MONO_ARRAY_MAX_INDEX => OutOfMemoryException
1162 * n < 0 => OverflowException
1164 * We can do an unsigned comparison to catch both cases, then in the error
1165 * case compare signed to distinguish between them.
1167 mono_mb_emit_ldarg (mb, 1);
1168 mono_mb_emit_icon (mb, MONO_ARRAY_MAX_INDEX);
1169 mono_mb_emit_byte (mb, CEE_CONV_U);
1170 pos = mono_mb_emit_short_branch (mb, CEE_BLE_UN_S);
1172 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1173 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1174 mono_mb_emit_ldarg (mb, 1);
1175 mono_mb_emit_icon (mb, 0);
1176 pos_error = mono_mb_emit_short_branch (mb, CEE_BLT_S);
1177 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1178 mono_mb_patch_short_branch (mb, pos_error);
1179 mono_mb_emit_exception (mb, "OverflowException", NULL);
1181 mono_mb_patch_short_branch (mb, pos);
1183 clause = (MonoExceptionClause *)mono_image_alloc0 (mono_defaults.corlib, sizeof (MonoExceptionClause));
1184 clause->try_offset = mono_mb_get_label (mb);
1186 /* vtable->klass->sizes.element_size */
1187 mono_mb_emit_ldarg (mb, 0);
1188 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1189 mono_mb_emit_byte (mb, CEE_ADD);
1190 mono_mb_emit_byte (mb, CEE_LDIND_I);
1191 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, sizes));
1192 mono_mb_emit_byte (mb, CEE_ADD);
1193 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1194 mono_mb_emit_byte (mb, CEE_CONV_I);
1197 mono_mb_emit_ldarg (mb, 1);
1198 mono_mb_emit_byte (mb, CEE_MUL_OVF_UN);
1199 /* + sizeof (MonoArray) */
1200 mono_mb_emit_icon (mb, MONO_SIZEOF_MONO_ARRAY);
1201 mono_mb_emit_byte (mb, CEE_ADD_OVF_UN);
1202 mono_mb_emit_stloc (mb, size_var);
1204 pos_leave = mono_mb_emit_branch (mb, CEE_LEAVE);
1207 clause->flags = MONO_EXCEPTION_CLAUSE_NONE;
1208 clause->try_len = mono_mb_get_pos (mb) - clause->try_offset;
1209 clause->data.catch_class = mono_class_load_from_name (mono_defaults.corlib,
1210 "System", "OverflowException");
1211 clause->handler_offset = mono_mb_get_label (mb);
1213 oom_exc_class = mono_class_load_from_name (mono_defaults.corlib,
1214 "System", "OutOfMemoryException");
1215 ctor = mono_class_get_method_from_name (oom_exc_class, ".ctor", 0);
1218 mono_mb_emit_byte (mb, CEE_POP);
1219 mono_mb_emit_op (mb, CEE_NEWOBJ, ctor);
1220 mono_mb_emit_byte (mb, CEE_THROW);
1222 clause->handler_len = mono_mb_get_pos (mb) - clause->handler_offset;
1223 mono_mb_set_clauses (mb, 1, clause);
1224 mono_mb_patch_branch (mb, pos_leave);
1226 } else if (atype == ATYPE_STRING) {
1230 * a string allocator method takes the args: (vtable, len)
1232 * bytes = offsetof (MonoString, chars) + ((len + 1) * 2)
1236 * bytes <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1240 * offsetof (MonoString, chars) + ((len + 1) * 2) <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1241 * len <= (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - offsetof (MonoString, chars)) / 2 - 1
1243 mono_mb_emit_ldarg (mb, 1);
1244 mono_mb_emit_icon (mb, (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - MONO_STRUCT_OFFSET (MonoString, chars)) / 2 - 1);
1245 pos = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
1247 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1248 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1249 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1250 mono_mb_patch_short_branch (mb, pos);
1252 mono_mb_emit_ldarg (mb, 1);
1253 mono_mb_emit_icon (mb, 1);
1254 mono_mb_emit_byte (mb, MONO_CEE_SHL);
1255 //WE manually fold the above + 2 here
1256 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, chars) + 2);
1257 mono_mb_emit_byte (mb, CEE_ADD);
1258 mono_mb_emit_stloc (mb, size_var);
1260 g_assert_not_reached ();
1263 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1264 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1265 mono_mb_emit_byte (mb, CEE_LDC_I4_1);
1266 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1267 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1268 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_NONE);
1271 if (nursery_canaries_enabled ()) {
1272 real_size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1273 mono_mb_emit_ldloc (mb, size_var);
1274 mono_mb_emit_stloc(mb, real_size_var);
1277 real_size_var = size_var;
1279 /* size += ALLOC_ALIGN - 1; */
1280 mono_mb_emit_ldloc (mb, size_var);
1281 mono_mb_emit_icon (mb, SGEN_ALLOC_ALIGN - 1);
1282 mono_mb_emit_byte (mb, CEE_ADD);
1283 /* size &= ~(ALLOC_ALIGN - 1); */
1284 mono_mb_emit_icon (mb, ~(SGEN_ALLOC_ALIGN - 1));
1285 mono_mb_emit_byte (mb, CEE_AND);
1286 mono_mb_emit_stloc (mb, size_var);
1288 /* if (size > MAX_SMALL_OBJ_SIZE) goto slowpath */
1289 if (atype != ATYPE_SMALL) {
1290 mono_mb_emit_ldloc (mb, size_var);
1291 mono_mb_emit_icon (mb, SGEN_MAX_SMALL_OBJ_SIZE);
1292 max_size_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
1296 * We need to modify tlab_next, but the JIT only supports reading, so we read
1297 * another tls var holding its address instead.
1300 /* tlab_next_addr (local) = tlab_next_addr (TLS var) */
1301 tlab_next_addr_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1302 EMIT_TLS_ACCESS_NEXT_ADDR (mb, thread_var);
1303 mono_mb_emit_stloc (mb, tlab_next_addr_var);
1305 /* p = (void**)tlab_next; */
1306 p_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1307 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1308 mono_mb_emit_byte (mb, CEE_LDIND_I);
1309 mono_mb_emit_stloc (mb, p_var);
1311 /* new_next = (char*)p + size; */
1312 new_next_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1313 mono_mb_emit_ldloc (mb, p_var);
1314 mono_mb_emit_ldloc (mb, size_var);
1315 mono_mb_emit_byte (mb, CEE_CONV_I);
1316 mono_mb_emit_byte (mb, CEE_ADD);
1318 if (nursery_canaries_enabled ()) {
1319 mono_mb_emit_icon (mb, CANARY_SIZE);
1320 mono_mb_emit_byte (mb, CEE_ADD);
1322 mono_mb_emit_stloc (mb, new_next_var);
1324 /* if (G_LIKELY (new_next < tlab_temp_end)) */
1325 mono_mb_emit_ldloc (mb, new_next_var);
1326 EMIT_TLS_ACCESS_TEMP_END (mb, thread_var);
1327 fastpath_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
1330 if (atype != ATYPE_SMALL)
1331 mono_mb_patch_short_branch (mb, max_size_branch);
1333 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1334 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1336 * We are no longer in a critical section. We need to do this before calling
1337 * to unmanaged land in order to avoid stw deadlocks since unmanaged code
1340 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1341 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1342 mono_mb_emit_byte (mb, CEE_LDC_I4_0);
1343 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1344 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1345 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_NONE);
1348 /* FIXME: mono_gc_alloc_obj takes a 'size_t' as an argument, not an int32 */
1349 mono_mb_emit_ldarg (mb, 0);
1350 mono_mb_emit_ldloc (mb, real_size_var);
1351 if (atype == ATYPE_NORMAL || atype == ATYPE_SMALL) {
1352 mono_mb_emit_icall (mb, mono_gc_alloc_obj);
1353 } else if (atype == ATYPE_VECTOR) {
1354 mono_mb_emit_ldarg (mb, 1);
1355 mono_mb_emit_icall (mb, mono_gc_alloc_vector);
1356 } else if (atype == ATYPE_STRING) {
1357 mono_mb_emit_ldarg (mb, 1);
1358 mono_mb_emit_icall (mb, mono_gc_alloc_string);
1360 g_assert_not_reached ();
1363 /* if (ret == NULL) throw OOM; */
1364 mono_mb_emit_byte (mb, CEE_DUP);
1365 no_oom_branch = mono_mb_emit_branch (mb, CEE_BRTRUE);
1366 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1368 mono_mb_patch_branch (mb, no_oom_branch);
1369 mono_mb_emit_byte (mb, CEE_RET);
1372 mono_mb_patch_short_branch (mb, fastpath_branch);
1374 /* FIXME: Memory barrier */
1376 /* tlab_next = new_next */
1377 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1378 mono_mb_emit_ldloc (mb, new_next_var);
1379 mono_mb_emit_byte (mb, CEE_STIND_I);
1382 mono_mb_emit_ldloc (mb, p_var);
1383 mono_mb_emit_ldarg (mb, 0);
1384 mono_mb_emit_byte (mb, CEE_STIND_I);
1386 /* mark object end with nursery word */
1387 if (nursery_canaries_enabled ()) {
1388 mono_mb_emit_ldloc (mb, p_var);
1389 mono_mb_emit_ldloc (mb, real_size_var);
1390 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1391 mono_mb_emit_icon8 (mb, (mword) CANARY_STRING);
1392 mono_mb_emit_icon (mb, CANARY_SIZE);
1393 mono_mb_emit_byte (mb, MONO_CEE_PREFIX1);
1394 mono_mb_emit_byte (mb, CEE_CPBLK);
1397 if (atype == ATYPE_VECTOR) {
1398 /* arr->max_length = max_length; */
1399 mono_mb_emit_ldloc (mb, p_var);
1400 mono_mb_emit_ldflda (mb, MONO_STRUCT_OFFSET (MonoArray, max_length));
1401 mono_mb_emit_ldarg (mb, 1);
1402 #ifdef MONO_BIG_ARRAYS
1403 mono_mb_emit_byte (mb, CEE_STIND_I);
1405 mono_mb_emit_byte (mb, CEE_STIND_I4);
1407 } else if (atype == ATYPE_STRING) {
1408 /* need to set length and clear the last char */
1409 /* s->length = len; */
1410 mono_mb_emit_ldloc (mb, p_var);
1411 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, length));
1412 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1413 mono_mb_emit_ldarg (mb, 1);
1414 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
1417 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1418 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1419 mono_mb_emit_byte (mb, CEE_LDC_I4_0);
1420 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1421 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1423 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1424 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1427 We must make sure both vtable and max_length are globaly visible before returning to managed land.
1429 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1432 mono_mb_emit_ldloc (mb, p_var);
1437 * It's important that we do this outside of the critical region as we
1438 * will be invoking arbitrary code.
1442 * if (G_UNLIKELY (*&mono_profiler_state.gc_allocation_count)) {
1443 * mono_profiler_raise_gc_allocation (p);
1447 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1448 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_PROFILER_ALLOCATION_COUNT);
1449 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1451 int prof_br = mono_mb_emit_short_branch (mb, CEE_BRFALSE_S);
1453 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1454 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1455 mono_mb_emit_byte (mb, CEE_DUP);
1456 mono_mb_emit_icall (mb, mono_profiler_raise_gc_allocation);
1458 mono_mb_patch_short_branch (mb, prof_br);
1461 mono_mb_emit_byte (mb, CEE_RET);
1464 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
1465 info->d.alloc.gc_name = "sgen";
1466 info->d.alloc.alloc_type = atype;
1469 mb->init_locals = FALSE;
1472 res = mono_mb_create (mb, csig, 8, info);
1481 mono_gc_get_aligned_size_for_allocator (int size)
1483 return SGEN_ALIGN_UP (size);
1487 * Generate an allocator method implementing the fast path of mono_gc_alloc_obj ().
1488 * The signature of the called method is:
1489 * object allocate (MonoVTable *vtable)
1492 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box, gboolean known_instance_size)
1494 #ifdef MANAGED_ALLOCATION
1495 ManagedAllocatorVariant variant = mono_profiler_allocations_enabled () ?
1496 MANAGED_ALLOCATOR_PROFILER : MANAGED_ALLOCATOR_REGULAR;
1498 if (collect_before_allocs)
1500 if (klass->instance_size > tlab_size)
1502 if (known_instance_size && ALIGN_TO (klass->instance_size, SGEN_ALLOC_ALIGN) >= SGEN_MAX_SMALL_OBJ_SIZE)
1504 if (mono_class_has_finalizer (klass) || mono_class_is_marshalbyref (klass))
1508 if (klass->byval_arg.type == MONO_TYPE_STRING)
1509 return mono_gc_get_managed_allocator_by_type (ATYPE_STRING, variant);
1510 /* Generic classes have dynamic field and can go above MAX_SMALL_OBJ_SIZE. */
1511 if (known_instance_size)
1512 return mono_gc_get_managed_allocator_by_type (ATYPE_SMALL, variant);
1514 return mono_gc_get_managed_allocator_by_type (ATYPE_NORMAL, variant);
1521 mono_gc_get_managed_array_allocator (MonoClass *klass)
1523 #ifdef MANAGED_ALLOCATION
1524 if (klass->rank != 1)
1526 if (has_per_allocation_action)
1528 g_assert (!mono_class_has_finalizer (klass) && !mono_class_is_marshalbyref (klass));
1530 return mono_gc_get_managed_allocator_by_type (ATYPE_VECTOR, mono_profiler_allocations_enabled () ?
1531 MANAGED_ALLOCATOR_PROFILER : MANAGED_ALLOCATOR_REGULAR);
1538 sgen_set_use_managed_allocator (gboolean flag)
1540 use_managed_allocator = flag;
1544 mono_gc_get_managed_allocator_by_type (int atype, ManagedAllocatorVariant variant)
1546 #ifdef MANAGED_ALLOCATION
1550 if (variant != MANAGED_ALLOCATOR_SLOW_PATH && !use_managed_allocator)
1554 case MANAGED_ALLOCATOR_REGULAR: cache = alloc_method_cache; break;
1555 case MANAGED_ALLOCATOR_SLOW_PATH: cache = slowpath_alloc_method_cache; break;
1556 case MANAGED_ALLOCATOR_PROFILER: cache = profiler_alloc_method_cache; break;
1557 default: g_assert_not_reached (); break;
1560 res = cache [atype];
1564 res = create_allocator (atype, variant);
1566 if (cache [atype]) {
1567 mono_free_method (res);
1568 res = cache [atype];
1570 mono_memory_barrier ();
1571 cache [atype] = res;
1582 mono_gc_get_managed_allocator_types (void)
1588 sgen_is_managed_allocator (MonoMethod *method)
1592 for (i = 0; i < ATYPE_NUM; ++i)
1593 if (method == alloc_method_cache [i] || method == slowpath_alloc_method_cache [i] || method == profiler_alloc_method_cache [i])
1599 sgen_has_managed_allocator (void)
1603 for (i = 0; i < ATYPE_NUM; ++i)
1604 if (alloc_method_cache [i] || slowpath_alloc_method_cache [i] || profiler_alloc_method_cache [i])
1609 #define ARRAY_OBJ_INDEX(ptr,array,elem_size) (((char*)(ptr) - ((char*)(array) + G_STRUCT_OFFSET (MonoArray, vector))) / (elem_size))
1612 sgen_client_cardtable_scan_object (GCObject *obj, guint8 *cards, ScanCopyContext ctx)
1614 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
1615 MonoClass *klass = vt->klass;
1617 SGEN_ASSERT (0, SGEN_VTABLE_HAS_REFERENCES (vt), "Why would we ever call this on reference-free objects?");
1620 MonoArray *arr = (MonoArray*)obj;
1621 guint8 *card_data, *card_base;
1622 guint8 *card_data_end;
1623 char *obj_start = (char *)sgen_card_table_align_pointer (obj);
1625 mword obj_size = sgen_mono_array_size (vt, arr, &bounds_size, sgen_vtable_get_descriptor (vt));
1626 /* We don't want to scan the bounds entries at the end of multidimensional arrays */
1627 char *obj_end = (char*)obj + obj_size - bounds_size;
1629 size_t extra_idx = 0;
1631 mword desc = (mword)klass->element_class->gc_descr;
1632 int elem_size = mono_array_element_size (klass);
1634 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1635 guint8 *overflow_scan_end = NULL;
1638 #ifdef SGEN_OBJECT_LAYOUT_STATISTICS
1639 if (klass->element_class->valuetype)
1640 sgen_object_layout_scanned_vtype_array ();
1642 sgen_object_layout_scanned_ref_array ();
1648 card_data = sgen_card_table_get_card_scan_address ((mword)obj);
1650 card_base = card_data;
1651 card_count = sgen_card_table_number_of_cards_in_range ((mword)obj, obj_size);
1652 card_data_end = card_data + card_count;
1655 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1656 /*Check for overflow and if so, setup to scan in two steps*/
1657 if (!cards && card_data_end >= SGEN_SHADOW_CARDTABLE_END) {
1658 overflow_scan_end = sgen_shadow_cardtable + (card_data_end - SGEN_SHADOW_CARDTABLE_END);
1659 card_data_end = SGEN_SHADOW_CARDTABLE_END;
1665 card_data = sgen_find_next_card (card_data, card_data_end);
1666 for (; card_data < card_data_end; card_data = sgen_find_next_card (card_data + 1, card_data_end)) {
1668 size_t idx = (card_data - card_base) + extra_idx;
1669 char *start = (char*)(obj_start + idx * CARD_SIZE_IN_BYTES);
1670 char *card_end = start + CARD_SIZE_IN_BYTES;
1671 char *first_elem, *elem;
1673 HEAVY_STAT (++los_marked_cards);
1676 sgen_card_table_prepare_card_for_scanning (card_data);
1678 card_end = MIN (card_end, obj_end);
1680 if (start <= (char*)arr->vector)
1683 index = ARRAY_OBJ_INDEX (start, obj, elem_size);
1685 elem = first_elem = (char*)mono_array_addr_with_size_fast ((MonoArray*)obj, elem_size, index);
1686 if (klass->element_class->valuetype) {
1687 ScanVTypeFunc scan_vtype_func = ctx.ops->scan_vtype;
1689 for (; elem < card_end; elem += elem_size)
1690 scan_vtype_func (obj, elem, desc, ctx.queue BINARY_PROTOCOL_ARG (elem_size));
1692 ScanPtrFieldFunc scan_ptr_field_func = ctx.ops->scan_ptr_field;
1694 HEAVY_STAT (++los_array_cards);
1695 for (; elem < card_end; elem += SIZEOF_VOID_P)
1696 scan_ptr_field_func (obj, (GCObject**)elem, ctx.queue);
1699 binary_protocol_card_scan (first_elem, elem - first_elem);
1702 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1703 if (overflow_scan_end) {
1704 extra_idx = card_data - card_base;
1705 card_base = card_data = sgen_shadow_cardtable;
1706 card_data_end = overflow_scan_end;
1707 overflow_scan_end = NULL;
1718 * Array and string allocation
1722 mono_gc_alloc_vector (MonoVTable *vtable, size_t size, uintptr_t max_length)
1727 if (!SGEN_CAN_ALIGN_UP (size))
1730 #ifndef DISABLE_CRITICAL_REGION
1731 ENTER_CRITICAL_REGION;
1732 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1734 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1735 arr->max_length = (mono_array_size_t)max_length;
1736 EXIT_CRITICAL_REGION;
1739 EXIT_CRITICAL_REGION;
1744 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1745 if (G_UNLIKELY (!arr)) {
1750 arr->max_length = (mono_array_size_t)max_length;
1755 if (G_UNLIKELY (mono_profiler_allocations_enabled ()))
1756 MONO_PROFILER_RAISE (gc_allocation, (&arr->obj));
1758 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Vector has incorrect size.");
1763 mono_gc_alloc_array (MonoVTable *vtable, size_t size, uintptr_t max_length, uintptr_t bounds_size)
1766 MonoArrayBounds *bounds;
1769 if (!SGEN_CAN_ALIGN_UP (size))
1772 #ifndef DISABLE_CRITICAL_REGION
1773 ENTER_CRITICAL_REGION;
1774 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1776 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1777 arr->max_length = (mono_array_size_t)max_length;
1779 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1780 arr->bounds = bounds;
1781 EXIT_CRITICAL_REGION;
1784 EXIT_CRITICAL_REGION;
1789 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1790 if (G_UNLIKELY (!arr)) {
1795 arr->max_length = (mono_array_size_t)max_length;
1797 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1798 arr->bounds = bounds;
1803 if (G_UNLIKELY (mono_profiler_allocations_enabled ()))
1804 MONO_PROFILER_RAISE (gc_allocation, (&arr->obj));
1806 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Array has incorrect size.");
1811 mono_gc_alloc_string (MonoVTable *vtable, size_t size, gint32 len)
1816 if (!SGEN_CAN_ALIGN_UP (size))
1819 #ifndef DISABLE_CRITICAL_REGION
1820 ENTER_CRITICAL_REGION;
1821 str = (MonoString*)sgen_try_alloc_obj_nolock (vtable, size);
1823 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1825 EXIT_CRITICAL_REGION;
1828 EXIT_CRITICAL_REGION;
1833 str = (MonoString*)sgen_alloc_obj_nolock (vtable, size);
1834 if (G_UNLIKELY (!str)) {
1844 if (G_UNLIKELY (mono_profiler_allocations_enabled ()))
1845 MONO_PROFILER_RAISE (gc_allocation, (&str->object));
1855 mono_gc_set_string_length (MonoString *str, gint32 new_length)
1857 mono_unichar2 *new_end = str->chars + new_length;
1859 /* zero the discarded string. This null-delimits the string and allows
1860 * the space to be reclaimed by SGen. */
1862 if (nursery_canaries_enabled () && sgen_ptr_in_nursery (str)) {
1863 CHECK_CANARY_FOR_OBJECT ((GCObject*)str, TRUE);
1864 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2) + CANARY_SIZE);
1865 memcpy (new_end + 1 , CANARY_STRING, CANARY_SIZE);
1867 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2));
1870 str->length = new_length;
1877 #define GC_ROOT_NUM 32
1879 int count; /* must be the first field */
1880 void *objects [GC_ROOT_NUM];
1881 int root_types [GC_ROOT_NUM];
1882 uintptr_t extra_info [GC_ROOT_NUM];
1886 notify_gc_roots (GCRootReport *report)
1890 MONO_PROFILER_RAISE (gc_roots, ((MonoObject **) report->objects, (MonoProfilerGCRootType *) report->root_types, report->extra_info, report->count));
1895 add_profile_gc_root (GCRootReport *report, void *object, int rtype, uintptr_t extra_info)
1897 if (report->count == GC_ROOT_NUM)
1898 notify_gc_roots (report);
1899 report->objects [report->count] = object;
1900 report->root_types [report->count] = rtype;
1901 report->extra_info [report->count++] = (uintptr_t)SGEN_LOAD_VTABLE (object)->klass;
1905 sgen_client_nursery_objects_pinned (void **definitely_pinned, int count)
1907 if (MONO_PROFILER_ENABLED (gc_roots)) {
1908 GCRootReport report;
1911 for (idx = 0; idx < count; ++idx)
1912 add_profile_gc_root (&report, definitely_pinned [idx], MONO_PROFILER_GC_ROOT_PINNING | MONO_PROFILER_GC_ROOT_MISC, 0);
1913 notify_gc_roots (&report);
1918 report_finalizer_roots_from_queue (SgenPointerQueue *queue)
1920 GCRootReport report;
1924 for (i = 0; i < queue->next_slot; ++i) {
1925 void *obj = queue->data [i];
1928 add_profile_gc_root (&report, obj, MONO_PROFILER_GC_ROOT_FINALIZER, 0);
1930 notify_gc_roots (&report);
1934 report_finalizer_roots (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
1936 report_finalizer_roots_from_queue (fin_ready_queue);
1937 report_finalizer_roots_from_queue (critical_fin_queue);
1940 static GCRootReport *root_report;
1943 single_arg_report_root (MonoObject **obj, void *gc_data)
1946 add_profile_gc_root (root_report, *obj, MONO_PROFILER_GC_ROOT_OTHER, 0);
1950 precisely_report_roots_from (GCRootReport *report, void** start_root, void** end_root, mword desc)
1952 switch (desc & ROOT_DESC_TYPE_MASK) {
1953 case ROOT_DESC_BITMAP:
1954 desc >>= ROOT_DESC_TYPE_SHIFT;
1956 if ((desc & 1) && *start_root) {
1957 add_profile_gc_root (report, *start_root, MONO_PROFILER_GC_ROOT_OTHER, 0);
1963 case ROOT_DESC_COMPLEX: {
1964 gsize *bitmap_data = (gsize *)sgen_get_complex_descriptor_bitmap (desc);
1965 gsize bwords = (*bitmap_data) - 1;
1966 void **start_run = start_root;
1968 while (bwords-- > 0) {
1969 gsize bmap = *bitmap_data++;
1970 void **objptr = start_run;
1972 if ((bmap & 1) && *objptr) {
1973 add_profile_gc_root (report, *objptr, MONO_PROFILER_GC_ROOT_OTHER, 0);
1978 start_run += GC_BITS_PER_WORD;
1982 case ROOT_DESC_VECTOR: {
1985 for (p = start_root; p < end_root; p++) {
1987 add_profile_gc_root (report, *p, MONO_PROFILER_GC_ROOT_OTHER, 0);
1991 case ROOT_DESC_USER: {
1992 MonoGCRootMarkFunc marker = (MonoGCRootMarkFunc)sgen_get_user_descriptor_func (desc);
1993 root_report = report;
1994 marker ((MonoObject**)start_root, single_arg_report_root, NULL);
1997 case ROOT_DESC_RUN_LEN:
1998 g_assert_not_reached ();
2000 g_assert_not_reached ();
2005 report_registered_roots_by_type (int root_type)
2007 GCRootReport report;
2011 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], void **, start_root, RootRecord *, root) {
2012 SGEN_LOG (6, "Precise root scan %p-%p (desc: %p)", start_root, root->end_root, (void*)root->root_desc);
2013 precisely_report_roots_from (&report, start_root, (void**)root->end_root, root->root_desc);
2014 } SGEN_HASH_TABLE_FOREACH_END;
2015 notify_gc_roots (&report);
2019 report_registered_roots (void)
2021 report_registered_roots_by_type (ROOT_TYPE_NORMAL);
2022 report_registered_roots_by_type (ROOT_TYPE_WBARRIER);
2026 sgen_client_collecting_minor (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2028 if (MONO_PROFILER_ENABLED (gc_roots))
2029 report_registered_roots ();
2031 if (MONO_PROFILER_ENABLED (gc_roots))
2032 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2035 static GCRootReport major_root_report;
2036 static gboolean profile_roots;
2039 sgen_client_collecting_major_1 (void)
2041 profile_roots = MONO_PROFILER_ENABLED (gc_roots);
2042 memset (&major_root_report, 0, sizeof (GCRootReport));
2046 sgen_client_pinned_los_object (GCObject *obj)
2049 add_profile_gc_root (&major_root_report, (char*)obj, MONO_PROFILER_GC_ROOT_PINNING | MONO_PROFILER_GC_ROOT_MISC, 0);
2053 sgen_client_collecting_major_2 (void)
2056 notify_gc_roots (&major_root_report);
2058 if (MONO_PROFILER_ENABLED (gc_roots))
2059 report_registered_roots ();
2063 sgen_client_collecting_major_3 (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2065 if (MONO_PROFILER_ENABLED (gc_roots))
2066 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2069 #define MOVED_OBJECTS_NUM 64
2070 static void *moved_objects [MOVED_OBJECTS_NUM];
2071 static int moved_objects_idx = 0;
2073 static SgenPointerQueue moved_objects_queue = SGEN_POINTER_QUEUE_INIT (INTERNAL_MEM_MOVED_OBJECT);
2076 mono_sgen_register_moved_object (void *obj, void *destination)
2079 * This function can be called from SGen's worker threads. We want to try
2080 * and avoid exposing those threads to the profiler API, so queue up move
2081 * events and send them later when the main GC thread calls
2082 * mono_sgen_gc_event_moves ().
2084 * TODO: Once SGen has multiple worker threads, we need to switch to a
2085 * lock-free data structure for the queue as multiple threads will be
2086 * adding to it at the same time.
2088 if (sgen_workers_is_worker_thread (mono_native_thread_id_get ())) {
2089 sgen_pointer_queue_add (&moved_objects_queue, obj);
2090 sgen_pointer_queue_add (&moved_objects_queue, destination);
2092 if (moved_objects_idx == MOVED_OBJECTS_NUM) {
2093 MONO_PROFILER_RAISE (gc_moves, ((MonoObject **) moved_objects, moved_objects_idx));
2094 moved_objects_idx = 0;
2097 moved_objects [moved_objects_idx++] = obj;
2098 moved_objects [moved_objects_idx++] = destination;
2103 mono_sgen_gc_event_moves (void)
2105 while (!sgen_pointer_queue_is_empty (&moved_objects_queue)) {
2106 void *dst = sgen_pointer_queue_pop (&moved_objects_queue);
2107 void *src = sgen_pointer_queue_pop (&moved_objects_queue);
2109 mono_sgen_register_moved_object (src, dst);
2112 if (moved_objects_idx) {
2113 MONO_PROFILER_RAISE (gc_moves, ((MonoObject **) moved_objects, moved_objects_idx));
2114 moved_objects_idx = 0;
2122 #define REFS_SIZE 128
2125 MonoGCReferences callback;
2129 MonoObject *refs [REFS_SIZE];
2130 uintptr_t offsets [REFS_SIZE];
2134 #define HANDLE_PTR(ptr,obj) do { \
2136 if (hwi->count == REFS_SIZE) { \
2137 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data); \
2141 hwi->offsets [hwi->count] = (char*)(ptr)-(char*)start; \
2142 hwi->refs [hwi->count++] = *(ptr); \
2147 collect_references (HeapWalkInfo *hwi, GCObject *obj, size_t size)
2149 char *start = (char*)obj;
2150 mword desc = sgen_obj_get_descriptor (obj);
2152 #include "sgen/sgen-scan-object.h"
2156 walk_references (GCObject *start, size_t size, void *data)
2158 HeapWalkInfo *hwi = (HeapWalkInfo *)data;
2161 collect_references (hwi, start, size);
2162 if (hwi->count || !hwi->called)
2163 hwi->callback (start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data);
2167 * mono_gc_walk_heap:
2168 * \param flags flags for future use
2169 * \param callback a function pointer called for each object in the heap
2170 * \param data a user data pointer that is passed to callback
2171 * This function can be used to iterate over all the live objects in the heap;
2172 * for each object, \p callback is invoked, providing info about the object's
2173 * location in memory, its class, its size and the objects it references.
2174 * For each referenced object its offset from the object address is
2175 * reported in the offsets array.
2176 * The object references may be buffered, so the callback may be invoked
2177 * multiple times for the same object: in all but the first call, the size
2178 * argument will be zero.
2179 * Note that this function can be only called in the \c MONO_GC_EVENT_PRE_START_WORLD
2180 * profiler event handler.
2181 * \returns a non-zero value if the GC doesn't support heap walking
2184 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
2189 hwi.callback = callback;
2192 sgen_clear_nursery_fragments ();
2193 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data, walk_references, &hwi, FALSE, TRUE);
2195 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, walk_references, &hwi);
2196 sgen_los_iterate_objects (walk_references, &hwi);
2206 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
2208 gc_callbacks = *callbacks;
2212 mono_gc_get_gc_callbacks ()
2214 return &gc_callbacks;
2218 mono_gc_thread_attach (SgenThreadInfo *info)
2220 return sgen_thread_attach (info);
2224 sgen_client_thread_attach (SgenThreadInfo* info)
2226 mono_tls_set_sgen_thread_info (info);
2228 info->client_info.skip = 0;
2230 info->client_info.stack_start = NULL;
2232 #ifdef SGEN_POSIX_STW
2233 info->client_info.stop_count = -1;
2234 info->client_info.signal = 0;
2237 memset (&info->client_info.ctx, 0, sizeof (MonoContext));
2239 if (mono_gc_get_gc_callbacks ()->thread_attach_func)
2240 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2242 binary_protocol_thread_register ((gpointer)mono_thread_info_get_tid (info));
2244 SGEN_LOG (3, "registered thread %p (%p) stack end %p", info, (gpointer)mono_thread_info_get_tid (info), info->client_info.info.stack_end);
2246 info->client_info.info.handle_stack = mono_handle_stack_alloc ();
2250 mono_gc_thread_detach_with_lock (SgenThreadInfo *info)
2252 return sgen_thread_detach_with_lock (info);
2256 sgen_client_thread_detach_with_lock (SgenThreadInfo *p)
2258 MonoNativeThreadId tid;
2260 mono_tls_set_sgen_thread_info (NULL);
2262 tid = mono_thread_info_get_tid (p);
2264 mono_threads_add_joinable_runtime_thread (&p->client_info.info);
2266 if (mono_gc_get_gc_callbacks ()->thread_detach_func) {
2267 mono_gc_get_gc_callbacks ()->thread_detach_func (p->client_info.runtime_data);
2268 p->client_info.runtime_data = NULL;
2271 binary_protocol_thread_unregister ((gpointer)tid);
2272 SGEN_LOG (3, "unregister thread %p (%p)", p, (gpointer)tid);
2274 HandleStack *handles = (HandleStack*) p->client_info.info.handle_stack;
2275 p->client_info.info.handle_stack = NULL;
2276 mono_handle_stack_free (handles);
2280 mono_gc_set_skip_thread (gboolean skip)
2282 SgenThreadInfo *info = mono_thread_info_current ();
2285 info->client_info.gc_disabled = skip;
2289 /* If we skip scanning a thread with a non-empty handle stack, we may move an
2290 * object but fail to update the reference in the handle.
2292 HandleStack *stack = info->client_info.info.handle_stack;
2293 g_assert (stack == NULL || mono_handle_stack_is_empty (stack));
2298 mono_gc_thread_in_critical_region (SgenThreadInfo *info)
2300 return info->client_info.in_critical_region;
2304 * mono_gc_is_gc_thread:
2307 mono_gc_is_gc_thread (void)
2311 result = mono_thread_info_current () != NULL;
2317 sgen_client_thread_register_worker (void)
2319 mono_thread_info_register_small_id ();
2320 mono_native_thread_set_name (mono_native_thread_id_get (), "SGen worker");
2323 /* Variables holding start/end nursery so it won't have to be passed at every call */
2324 static void *scan_area_arg_start, *scan_area_arg_end;
2327 mono_gc_conservatively_scan_area (void *start, void *end)
2329 sgen_conservatively_pin_objects_from ((void **)start, (void **)end, scan_area_arg_start, scan_area_arg_end, PIN_TYPE_STACK);
2333 mono_gc_scan_object (void *obj, void *gc_data)
2335 ScanCopyContext *ctx = (ScanCopyContext *)gc_data;
2336 ctx->ops->copy_or_mark_object ((GCObject**)&obj, ctx->queue);
2341 void **start_nursery;
2343 } PinHandleStackInteriorPtrData;
2345 /* Called when we're scanning the handle stack imprecisely and we encounter a pointer into the
2346 middle of an object.
2349 pin_handle_stack_interior_ptrs (void **ptr_slot, void *user_data)
2351 PinHandleStackInteriorPtrData *ud = (PinHandleStackInteriorPtrData *)user_data;
2352 sgen_conservatively_pin_objects_from (ptr_slot, ptr_slot+1, ud->start_nursery, ud->end_nursery, PIN_TYPE_STACK);
2357 * Mark from thread stacks and registers.
2360 sgen_client_scan_thread_data (void *start_nursery, void *end_nursery, gboolean precise, ScanCopyContext ctx)
2362 scan_area_arg_start = start_nursery;
2363 scan_area_arg_end = end_nursery;
2365 //Under WASM we don't scan thread stacks and we can't trust the values we find there either.
2369 FOREACH_THREAD (info) {
2370 int skip_reason = 0;
2371 void *aligned_stack_start;
2373 if (info->client_info.skip) {
2374 SGEN_LOG (3, "Skipping dead thread %p, range: %p-%p, size: %zd", info, info->client_info.stack_start, info->client_info.info.stack_end, (char*)info->client_info.info.stack_end - (char*)info->client_info.stack_start);
2376 } else if (info->client_info.gc_disabled) {
2377 SGEN_LOG (3, "GC disabled for thread %p, range: %p-%p, size: %zd", info, info->client_info.stack_start, info->client_info.info.stack_end, (char*)info->client_info.info.stack_end - (char*)info->client_info.stack_start);
2379 } else if (!mono_thread_info_is_live (info)) {
2380 SGEN_LOG (3, "Skipping non-running thread %p, range: %p-%p, size: %zd (state %x)", info, info->client_info.stack_start, info->client_info.info.stack_end, (char*)info->client_info.info.stack_end - (char*)info->client_info.stack_start, info->client_info.info.thread_state);
2382 } else if (!info->client_info.stack_start) {
2383 SGEN_LOG (3, "Skipping starting or detaching thread %p", info);
2387 binary_protocol_scan_stack ((gpointer)mono_thread_info_get_tid (info), info->client_info.stack_start, info->client_info.info.stack_end, skip_reason);
2391 /* If we skip a thread with a non-empty handle stack and then it
2392 * resumes running we may potentially move an object but fail to
2393 * update the reference in the handle.
2395 HandleStack *stack = info->client_info.info.handle_stack;
2396 g_assert (stack == NULL || mono_handle_stack_is_empty (stack));
2401 g_assert (info->client_info.stack_start);
2402 g_assert (info->client_info.info.stack_end);
2404 aligned_stack_start = (void*)(mword) ALIGN_TO ((mword)info->client_info.stack_start, SIZEOF_VOID_P);
2406 /* Windows uses a guard page before the committed stack memory pages to detect when the
2407 stack needs to be grown. If we suspend a thread just after a function prolog has
2408 decremented the stack pointer to point into the guard page but before the thread has
2409 been able to read or write to that page, starting the stack scan at aligned_stack_start
2410 will raise a STATUS_GUARD_PAGE_VIOLATION and the process will crash. This code uses
2411 VirtualQuery() to determine whether stack_start points into the guard page and then
2412 updates aligned_stack_start to point at the next non-guard page. */
2413 MEMORY_BASIC_INFORMATION mem_info;
2414 SIZE_T result = VirtualQuery(info->client_info.stack_start, &mem_info, sizeof(mem_info));
2415 g_assert (result != 0);
2416 if (mem_info.Protect & PAGE_GUARD) {
2417 aligned_stack_start = ((char*) mem_info.BaseAddress) + mem_info.RegionSize;
2421 g_assert (info->client_info.suspend_done);
2422 SGEN_LOG (3, "Scanning thread %p, range: %p-%p, size: %zd, pinned=%zd", info, info->client_info.stack_start, info->client_info.info.stack_end, (char*)info->client_info.info.stack_end - (char*)info->client_info.stack_start, sgen_get_pinned_count ());
2423 if (mono_gc_get_gc_callbacks ()->thread_mark_func && !conservative_stack_mark) {
2424 mono_gc_get_gc_callbacks ()->thread_mark_func (info->client_info.runtime_data, (guint8 *)aligned_stack_start, (guint8 *)info->client_info.info.stack_end, precise, &ctx);
2425 } else if (!precise) {
2426 if (!conservative_stack_mark) {
2427 fprintf (stderr, "Precise stack mark not supported - disabling.\n");
2428 conservative_stack_mark = TRUE;
2430 //FIXME we should eventually use the new stack_mark from coop
2431 sgen_conservatively_pin_objects_from ((void **)aligned_stack_start, (void **)info->client_info.info.stack_end, start_nursery, end_nursery, PIN_TYPE_STACK);
2435 sgen_conservatively_pin_objects_from ((void**)&info->client_info.ctx, (void**)(&info->client_info.ctx + 1),
2436 start_nursery, end_nursery, PIN_TYPE_STACK);
2439 // This is used on Coop GC for platforms where we cannot get the data for individual registers.
2440 // We force a spill of all registers into the stack and pass a chunk of data into sgen.
2441 //FIXME under coop, for now, what we need to ensure is that we scan any extra memory from info->client_info.info.stack_end to stack_mark
2442 MonoThreadUnwindState *state = &info->client_info.info.thread_saved_state [SELF_SUSPEND_STATE_INDEX];
2443 if (state && state->gc_stackdata) {
2444 sgen_conservatively_pin_objects_from ((void **)state->gc_stackdata, (void**)((char*)state->gc_stackdata + state->gc_stackdata_size),
2445 start_nursery, end_nursery, PIN_TYPE_STACK);
2449 if (info->client_info.info.handle_stack) {
2451 Make two passes over the handle stack. On the imprecise pass, pin all
2452 objects where the handle points into the interior of the object. On the
2453 precise pass, copy or mark all the objects that have handles to the
2454 beginning of the object.
2457 mono_handle_stack_scan ((HandleStack*)info->client_info.info.handle_stack, (GcScanFunc)ctx.ops->copy_or_mark_object, ctx.queue, precise);
2459 PinHandleStackInteriorPtrData ud = { .start_nursery = start_nursery,
2460 .end_nursery = end_nursery,
2462 mono_handle_stack_scan ((HandleStack*)info->client_info.info.handle_stack, pin_handle_stack_interior_ptrs, &ud, precise);
2465 } FOREACH_THREAD_END
2469 * mono_gc_set_stack_end:
2471 * Set the end of the current threads stack to STACK_END. The stack space between
2472 * STACK_END and the real end of the threads stack will not be scanned during collections.
2475 mono_gc_set_stack_end (void *stack_end)
2477 SgenThreadInfo *info;
2480 info = mono_thread_info_current ();
2482 SGEN_ASSERT (0, stack_end < info->client_info.info.stack_end, "Can only lower stack end");
2483 info->client_info.info.stack_end = stack_end;
2493 mono_gc_register_root (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2495 return sgen_register_root (start, size, descr, descr ? ROOT_TYPE_NORMAL : ROOT_TYPE_PINNED, source, msg);
2499 mono_gc_register_root_wbarrier (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2501 return sgen_register_root (start, size, descr, ROOT_TYPE_WBARRIER, source, msg);
2505 mono_gc_deregister_root (char* addr)
2507 sgen_deregister_root (addr);
2516 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
2520 mono_threads_join_lock ();
2521 res = pthread_create (new_thread, attr, start_routine, arg);
2522 mono_threads_join_unlock ();
2533 sgen_client_total_allocated_heap_changed (size_t allocated_heap)
2535 mono_runtime_resource_check_limit (MONO_RESOURCE_GC_HEAP, allocated_heap);
2539 mono_gc_user_markers_supported (void)
2545 mono_object_is_alive (MonoObject* o)
2551 mono_gc_get_generation (MonoObject *obj)
2553 if (sgen_ptr_in_nursery (obj))
2559 mono_gc_get_gc_name (void)
2565 mono_gc_get_description (void)
2567 #ifdef HAVE_CONC_GC_AS_DEFAULT
2568 return g_strdup ("sgen (concurrent by default)");
2570 return g_strdup ("sgen");
2575 mono_gc_set_desktop_mode (void)
2580 mono_gc_is_moving (void)
2586 mono_gc_is_disabled (void)
2592 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
2599 mono_gc_max_generation (void)
2605 mono_gc_precise_stack_mark_enabled (void)
2607 return !conservative_stack_mark;
2611 mono_gc_collect (int generation)
2613 sgen_gc_collect (generation);
2617 mono_gc_collection_count (int generation)
2619 return sgen_gc_collection_count (generation);
2623 mono_gc_get_used_size (void)
2625 return (int64_t)sgen_gc_get_used_size ();
2629 mono_gc_get_heap_size (void)
2631 return (int64_t)sgen_gc_get_total_heap_allocation ();
2635 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
2637 return sgen_make_user_root_descriptor (marker);
2641 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
2643 return SGEN_DESC_STRING;
2647 mono_gc_get_nursery (int *shift_bits, size_t *size)
2649 *size = sgen_nursery_size;
2650 *shift_bits = sgen_nursery_bits;
2651 return sgen_get_nursery_start ();
2655 mono_gc_get_los_limit (void)
2657 return SGEN_MAX_SMALL_OBJ_SIZE;
2661 sgen_client_default_metadata (void)
2663 return mono_domain_get ();
2667 sgen_client_metadata_for_object (GCObject *obj)
2669 return mono_object_domain (obj);
2673 * mono_gchandle_new:
2674 * \param obj managed object to get a handle for
2675 * \param pinned whether the object should be pinned
2676 * This returns a handle that wraps the object, this is used to keep a
2677 * reference to a managed object from the unmanaged world and preventing the
2678 * object from being disposed.
2680 * If \p pinned is false the address of the object can not be obtained, if it is
2681 * true the address of the object can be obtained. This will also pin the
2682 * object so it will not be possible by a moving garbage collector to move the
2685 * \returns a handle that can be used to access the object from unmanaged code.
2688 mono_gchandle_new (MonoObject *obj, gboolean pinned)
2690 return sgen_gchandle_new (obj, pinned);
2694 * mono_gchandle_new_weakref:
2695 * \param obj managed object to get a handle for
2696 * \param track_resurrection Determines how long to track the object, if this is set to TRUE, the object is tracked after finalization, if FALSE, the object is only tracked up until the point of finalization.
2698 * This returns a weak handle that wraps the object, this is used to
2699 * keep a reference to a managed object from the unmanaged world.
2700 * Unlike the \c mono_gchandle_new the object can be reclaimed by the
2701 * garbage collector. In this case the value of the GCHandle will be
2704 * If \p track_resurrection is TRUE the object will be tracked through
2705 * finalization and if the object is resurrected during the execution
2706 * of the finalizer, then the returned weakref will continue to hold
2707 * a reference to the object. If \p track_resurrection is FALSE, then
2708 * the weak reference's target will become NULL as soon as the object
2709 * is passed on to the finalizer.
2711 * \returns a handle that can be used to access the object from
2715 mono_gchandle_new_weakref (GCObject *obj, gboolean track_resurrection)
2717 return sgen_gchandle_new_weakref (obj, track_resurrection);
2721 * mono_gchandle_is_in_domain:
2722 * \param gchandle a GCHandle's handle.
2723 * \param domain An application domain.
2724 * \returns TRUE if the object wrapped by the \p gchandle belongs to the specific \p domain.
2727 mono_gchandle_is_in_domain (guint32 gchandle, MonoDomain *domain)
2729 MonoDomain *gchandle_domain = (MonoDomain *)sgen_gchandle_get_metadata (gchandle);
2730 return domain->domain_id == gchandle_domain->domain_id;
2734 * mono_gchandle_free:
2735 * \param gchandle a GCHandle's handle.
2737 * Frees the \p gchandle handle. If there are no outstanding
2738 * references, the garbage collector can reclaim the memory of the
2742 mono_gchandle_free (guint32 gchandle)
2744 sgen_gchandle_free (gchandle);
2748 * mono_gchandle_free_domain:
2749 * \param unloading domain that is unloading
2751 * Function used internally to cleanup any GC handle for objects belonging
2752 * to the specified domain during appdomain unload.
2755 mono_gchandle_free_domain (MonoDomain *unloading)
2760 * mono_gchandle_get_target:
2761 * \param gchandle a GCHandle's handle.
2763 * The handle was previously created by calling \c mono_gchandle_new or
2764 * \c mono_gchandle_new_weakref.
2766 * \returns a pointer to the \c MonoObject* represented by the handle or
2767 * NULL for a collected object if using a weakref handle.
2770 mono_gchandle_get_target (guint32 gchandle)
2772 return sgen_gchandle_get_target (gchandle);
2776 null_link_if_in_domain (gpointer hidden, GCHandleType handle_type, int max_generation, gpointer user)
2778 MonoDomain *unloading_domain = (MonoDomain *)user;
2779 MonoDomain *obj_domain;
2780 gboolean is_weak = MONO_GC_HANDLE_TYPE_IS_WEAK (handle_type);
2781 if (MONO_GC_HANDLE_IS_OBJECT_POINTER (hidden)) {
2782 MonoObject *obj = (MonoObject *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2783 obj_domain = mono_object_domain (obj);
2785 obj_domain = (MonoDomain *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2787 if (unloading_domain->domain_id == obj_domain->domain_id)
2793 sgen_null_links_for_domain (MonoDomain *domain)
2796 for (type = HANDLE_TYPE_MIN; type < HANDLE_TYPE_MAX; ++type)
2797 sgen_gchandle_iterate ((GCHandleType)type, GENERATION_OLD, null_link_if_in_domain, domain);
2801 mono_gchandle_set_target (guint32 gchandle, MonoObject *obj)
2803 sgen_gchandle_set_target (gchandle, obj);
2807 sgen_client_gchandle_created (int handle_type, GCObject *obj, guint32 handle)
2809 #ifndef DISABLE_PERFCOUNTERS
2810 InterlockedIncrement (&mono_perfcounters->gc_num_handles);
2813 MONO_PROFILER_RAISE (gc_handle_created, (handle, handle_type, obj));
2817 sgen_client_gchandle_destroyed (int handle_type, guint32 handle)
2819 #ifndef DISABLE_PERFCOUNTERS
2820 InterlockedDecrement (&mono_perfcounters->gc_num_handles);
2823 MONO_PROFILER_RAISE (gc_handle_deleted, (handle, handle_type));
2827 sgen_client_ensure_weak_gchandles_accessible (void)
2830 * During the second bridge processing step the world is
2831 * running again. That step processes all weak links once
2832 * more to null those that refer to dead objects. Before that
2833 * is completed, those links must not be followed, so we
2834 * conservatively wait for bridge processing when any weak
2835 * link is dereferenced.
2837 /* FIXME: A GC can occur after this check fails, in which case we
2838 * should wait for bridge processing but would fail to do so.
2840 if (G_UNLIKELY (bridge_processing_in_progress))
2841 mono_gc_wait_for_bridge_processing ();
2845 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
2849 result = func (data);
2850 UNLOCK_INTERRUPTION;
2855 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
2861 mono_gc_get_card_table (int *shift_bits, gpointer *mask)
2863 return sgen_get_card_table_configuration (shift_bits, mask);
2867 mono_gc_card_table_nursery_check (void)
2869 return !sgen_get_major_collector ()->is_concurrent;
2872 /* Negative value to remove */
2874 mono_gc_add_memory_pressure (gint64 value)
2876 /* FIXME: Implement at some point? */
2884 sgen_client_degraded_allocation (void)
2886 static gint32 last_major_gc_warned = -1;
2887 static gint32 num_degraded = 0;
2889 gint32 major_gc_count = InterlockedRead (&gc_stats.major_gc_count);
2890 if (InterlockedRead (&last_major_gc_warned) < major_gc_count) {
2891 gint32 num = InterlockedIncrement (&num_degraded);
2892 if (num == 1 || num == 3)
2893 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Degraded allocation. Consider increasing nursery-size if the warning persists.");
2895 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Repeated degraded allocation. Consider increasing nursery-size.");
2896 InterlockedWrite (&last_major_gc_warned, major_gc_count);
2905 sgen_client_description_for_internal_mem_type (int type)
2908 case INTERNAL_MEM_EPHEMERON_LINK: return "ephemeron-link";
2909 case INTERNAL_MEM_MOVED_OBJECT: return "moved-object";
2916 sgen_client_pre_collection_checks (void)
2918 if (sgen_mono_xdomain_checks) {
2919 sgen_clear_nursery_fragments ();
2920 sgen_check_for_xdomain_refs ();
2925 sgen_client_vtable_is_inited (MonoVTable *vt)
2927 return vt->klass->inited;
2931 sgen_client_vtable_get_namespace (MonoVTable *vt)
2933 return vt->klass->name_space;
2937 sgen_client_vtable_get_name (MonoVTable *vt)
2939 return vt->klass->name;
2947 sgen_client_init (void)
2949 mono_thread_callbacks_init ();
2950 mono_thread_info_init (sizeof (SgenThreadInfo));
2952 ///* Keep this the default for now */
2953 /* Precise marking is broken on all supported targets. Disable until fixed. */
2954 conservative_stack_mark = TRUE;
2956 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_EPHEMERON_LINK, sizeof (EphemeronLinkNode));
2958 mono_sgen_init_stw ();
2960 mono_tls_init_gc_keys ();
2962 mono_thread_info_attach ();
2966 sgen_client_handle_gc_param (const char *opt)
2968 if (g_str_has_prefix (opt, "stack-mark=")) {
2969 opt = strchr (opt, '=') + 1;
2970 if (!strcmp (opt, "precise")) {
2971 conservative_stack_mark = FALSE;
2972 } else if (!strcmp (opt, "conservative")) {
2973 conservative_stack_mark = TRUE;
2975 sgen_env_var_error (MONO_GC_PARAMS_NAME, conservative_stack_mark ? "Using `conservative`." : "Using `precise`.",
2976 "Invalid value `%s` for `stack-mark` option, possible values are: `precise`, `conservative`.", opt);
2978 } else if (g_str_has_prefix (opt, "bridge-implementation=")) {
2979 opt = strchr (opt, '=') + 1;
2980 sgen_set_bridge_implementation (opt);
2981 } else if (g_str_has_prefix (opt, "toggleref-test")) {
2982 /* FIXME: This should probably in MONO_GC_DEBUG */
2983 sgen_register_test_toggleref_callback ();
2984 } else if (!sgen_bridge_handle_gc_param (opt)) {
2991 sgen_client_print_gc_params_usage (void)
2993 fprintf (stderr, " stack-mark=MARK-METHOD (where MARK-METHOD is 'precise' or 'conservative')\n");
2997 sgen_client_handle_gc_debug (const char *opt)
2999 if (!strcmp (opt, "xdomain-checks")) {
3000 sgen_mono_xdomain_checks = TRUE;
3001 } else if (!strcmp (opt, "do-not-finalize")) {
3002 mono_do_not_finalize = TRUE;
3003 } else if (g_str_has_prefix (opt, "do-not-finalize=")) {
3004 opt = strchr (opt, '=') + 1;
3005 mono_do_not_finalize = TRUE;
3006 mono_do_not_finalize_class_names = g_strsplit (opt, ",", 0);
3007 } else if (!strcmp (opt, "log-finalizers")) {
3008 log_finalizers = TRUE;
3009 } else if (!strcmp (opt, "no-managed-allocator")) {
3010 sgen_set_use_managed_allocator (FALSE);
3011 } else if (!sgen_bridge_handle_gc_debug (opt)) {
3018 sgen_client_print_gc_debug_usage (void)
3020 fprintf (stderr, " xdomain-checks\n");
3021 fprintf (stderr, " do-not-finalize\n");
3022 fprintf (stderr, " log-finalizers\n");
3023 fprintf (stderr, " no-managed-allocator\n");
3024 sgen_bridge_print_gc_debug_usage ();
3029 sgen_client_get_provenance (void)
3031 #ifdef SGEN_OBJECT_PROVENANCE
3032 MonoGCCallbacks *cb = mono_gc_get_gc_callbacks ();
3033 gpointer (*get_provenance_func) (void);
3036 get_provenance_func = cb->get_provenance_func;
3037 if (get_provenance_func)
3038 return get_provenance_func ();
3046 sgen_client_describe_invalid_pointer (GCObject *ptr)
3048 sgen_bridge_describe_pointer (ptr);
3051 static gboolean gc_inited;
3054 * mono_gc_base_init:
3057 mono_gc_base_init (void)
3062 mono_counters_init ();
3065 mono_w32handle_init ();
3068 #ifdef HEAVY_STATISTICS
3069 mono_counters_register ("los marked cards", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_marked_cards);
3070 mono_counters_register ("los array cards scanned ", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_cards);
3071 mono_counters_register ("los array remsets", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_remsets);
3073 mono_counters_register ("WBarrier set arrayref", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_set_arrayref);
3074 mono_counters_register ("WBarrier value copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_value_copy);
3075 mono_counters_register ("WBarrier object copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_object_copy);
3084 mono_gc_base_cleanup (void)
3086 sgen_thread_pool_shutdown ();
3088 // We should have consumed any outstanding moves.
3089 g_assert (sgen_pointer_queue_is_empty (&moved_objects_queue));
3093 mono_gc_is_null (void)