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.name = "array_filler_type";
403 vtable->klass = &klass;
405 vtable->gc_descr = mono_gc_make_descr_for_array (TRUE, &bmap, 0, 1);
408 array_fill_vtable = vtable;
410 return array_fill_vtable;
414 sgen_client_array_fill_range (char *start, size_t size)
418 if (size < MONO_SIZEOF_MONO_ARRAY) {
419 memset (start, 0, size);
423 o = (MonoArray*)start;
424 o->obj.vtable = (MonoVTable*)get_array_fill_vtable ();
425 /* Mark this as not a real object */
426 o->obj.synchronisation = (MonoThreadsSync *)GINT_TO_POINTER (-1);
428 o->max_length = (mono_array_size_t)(size - MONO_SIZEOF_MONO_ARRAY);
434 sgen_client_zero_array_fill_header (void *p, size_t size)
436 if (size >= MONO_SIZEOF_MONO_ARRAY) {
437 memset (p, 0, MONO_SIZEOF_MONO_ARRAY);
439 static guint8 zeros [MONO_SIZEOF_MONO_ARRAY];
441 SGEN_ASSERT (0, !memcmp (p, zeros, size), "TLAB segment must be zeroed out.");
449 static MonoGCFinalizerCallbacks fin_callbacks;
452 mono_gc_get_vtable_bits (MonoClass *klass)
455 /* FIXME move this to the bridge code */
456 if (sgen_need_bridge_processing ()) {
457 switch (sgen_bridge_class_kind (klass)) {
458 case GC_BRIDGE_TRANSPARENT_BRIDGE_CLASS:
459 case GC_BRIDGE_OPAQUE_BRIDGE_CLASS:
460 res = SGEN_GC_BIT_BRIDGE_OBJECT;
462 case GC_BRIDGE_OPAQUE_CLASS:
463 res = SGEN_GC_BIT_BRIDGE_OPAQUE_OBJECT;
465 case GC_BRIDGE_TRANSPARENT_CLASS:
469 if (fin_callbacks.is_class_finalization_aware) {
470 if (fin_callbacks.is_class_finalization_aware (klass))
471 res |= SGEN_GC_BIT_FINALIZER_AWARE;
477 is_finalization_aware (MonoObject *obj)
479 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
480 return (vt->gc_bits & SGEN_GC_BIT_FINALIZER_AWARE) == SGEN_GC_BIT_FINALIZER_AWARE;
484 sgen_client_object_queued_for_finalization (GCObject *obj)
486 if (fin_callbacks.object_queued_for_finalization && is_finalization_aware (obj))
487 fin_callbacks.object_queued_for_finalization (obj);
490 if (G_UNLIKELY (MONO_GC_FINALIZE_ENQUEUE_ENABLED ())) {
491 int gen = sgen_ptr_in_nursery (obj) ? GENERATION_NURSERY : GENERATION_OLD;
492 GCVTable vt = SGEN_LOAD_VTABLE (obj);
493 MONO_GC_FINALIZE_ENQUEUE ((mword)obj, sgen_safe_object_get_size (obj),
494 sgen_client_vtable_get_namespace (vt), sgen_client_vtable_get_name (vt), gen,
495 sgen_client_object_has_critical_finalizer (obj));
501 mono_gc_register_finalizer_callbacks (MonoGCFinalizerCallbacks *callbacks)
503 if (callbacks->version != MONO_GC_FINALIZER_EXTENSION_VERSION)
504 g_error ("Invalid finalizer callback version. Expected %d but got %d\n", MONO_GC_FINALIZER_EXTENSION_VERSION, callbacks->version);
506 fin_callbacks = *callbacks;
510 sgen_client_run_finalize (MonoObject *obj)
512 mono_gc_run_finalize (obj, NULL);
516 * mono_gc_invoke_finalizers:
519 mono_gc_invoke_finalizers (void)
521 return sgen_gc_invoke_finalizers ();
525 * mono_gc_pending_finalizers:
528 mono_gc_pending_finalizers (void)
530 return sgen_have_pending_finalizers ();
534 sgen_client_finalize_notify (void)
536 mono_gc_finalize_notify ();
540 mono_gc_register_for_finalization (MonoObject *obj, void *user_data)
542 sgen_object_register_for_finalization (obj, user_data);
546 object_in_domain_predicate (MonoObject *obj, void *user_data)
548 MonoDomain *domain = (MonoDomain *)user_data;
549 if (mono_object_domain (obj) == domain) {
550 SGEN_LOG (5, "Unregistering finalizer for object: %p (%s)", obj, sgen_client_vtable_get_name (SGEN_LOAD_VTABLE (obj)));
557 * mono_gc_finalizers_for_domain:
558 * \param domain the unloading appdomain
559 * \param out_array output array
560 * \param out_size size of output array
561 * Enqueue for finalization all objects that belong to the unloading appdomain \p domain.
562 * \p suspend is used for early termination of the enqueuing process.
565 mono_gc_finalize_domain (MonoDomain *domain)
567 sgen_finalize_if (object_in_domain_predicate, domain);
571 mono_gc_suspend_finalizers (void)
573 sgen_set_suspend_finalizers ();
580 typedef struct _EphemeronLinkNode EphemeronLinkNode;
582 struct _EphemeronLinkNode {
583 EphemeronLinkNode *next;
592 static EphemeronLinkNode *ephemeron_list;
594 /* LOCKING: requires that the GC lock is held */
596 null_ephemerons_for_domain (MonoDomain *domain)
598 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
601 MonoObject *object = (MonoObject*)current->array;
604 SGEN_ASSERT (0, object->vtable, "Can't have objects without vtables.");
606 if (object && object->vtable->domain == domain) {
607 EphemeronLinkNode *tmp = current;
610 prev->next = current->next;
612 ephemeron_list = current->next;
614 current = current->next;
615 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
618 current = current->next;
623 /* LOCKING: requires that the GC lock is held */
625 sgen_client_clear_unreachable_ephemerons (ScanCopyContext ctx)
627 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
628 SgenGrayQueue *queue = ctx.queue;
629 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
630 Ephemeron *cur, *array_end;
634 MonoArray *array = current->array;
636 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
637 EphemeronLinkNode *tmp = current;
639 SGEN_LOG (5, "Dead Ephemeron array at %p", array);
642 prev->next = current->next;
644 ephemeron_list = current->next;
646 current = current->next;
647 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
652 copy_func ((GCObject**)&array, queue);
653 current->array = array;
655 SGEN_LOG (5, "Clearing unreachable entries for ephemeron array at %p", array);
657 cur = mono_array_addr (array, Ephemeron, 0);
658 array_end = cur + mono_array_length_fast (array);
659 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
661 for (; cur < array_end; ++cur) {
662 GCObject *key = cur->key;
664 if (!key || key == tombstone)
667 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
668 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
669 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
671 if (!sgen_is_object_alive_for_current_gen (key)) {
672 cur->key = tombstone;
678 current = current->next;
683 LOCKING: requires that the GC lock is held
685 Limitations: We scan all ephemerons on every collection since the current design doesn't allow for a simple nursery/mature split.
688 sgen_client_mark_ephemerons (ScanCopyContext ctx)
690 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
691 SgenGrayQueue *queue = ctx.queue;
692 gboolean nothing_marked = TRUE;
693 EphemeronLinkNode *current = ephemeron_list;
694 Ephemeron *cur, *array_end;
697 for (current = ephemeron_list; current; current = current->next) {
698 MonoArray *array = current->array;
699 SGEN_LOG (5, "Ephemeron array at %p", array);
701 /*It has to be alive*/
702 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
703 SGEN_LOG (5, "\tnot reachable");
707 copy_func ((GCObject**)&array, queue);
709 cur = mono_array_addr (array, Ephemeron, 0);
710 array_end = cur + mono_array_length_fast (array);
711 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
713 for (; cur < array_end; ++cur) {
714 GCObject *key = cur->key;
716 if (!key || key == tombstone)
719 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
720 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
721 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
723 if (sgen_is_object_alive_for_current_gen (key)) {
724 GCObject *value = cur->value;
726 copy_func (&cur->key, queue);
728 if (!sgen_is_object_alive_for_current_gen (value))
729 nothing_marked = FALSE;
730 copy_func (&cur->value, queue);
736 SGEN_LOG (5, "Ephemeron run finished. Is it done %d", nothing_marked);
737 return nothing_marked;
741 mono_gc_ephemeron_array_add (MonoObject *obj)
743 EphemeronLinkNode *node;
747 node = (EphemeronLinkNode *)sgen_alloc_internal (INTERNAL_MEM_EPHEMERON_LINK);
752 node->array = (MonoArray*)obj;
753 node->next = ephemeron_list;
754 ephemeron_list = node;
756 SGEN_LOG (5, "Registered ephemeron array %p", obj);
767 need_remove_object_for_domain (GCObject *start, MonoDomain *domain)
769 if (mono_object_domain (start) == domain) {
770 SGEN_LOG (4, "Need to cleanup object %p", start);
771 binary_protocol_cleanup (start, (gpointer)SGEN_LOAD_VTABLE (start), sgen_safe_object_get_size ((GCObject*)start));
778 process_object_for_domain_clearing (GCObject *start, MonoDomain *domain)
780 MonoVTable *vt = SGEN_LOAD_VTABLE (start);
781 if (vt->klass == mono_defaults.internal_thread_class)
782 g_assert (mono_object_domain (start) == mono_get_root_domain ());
783 /* The object could be a proxy for an object in the domain
785 #ifndef DISABLE_REMOTING
786 if (mono_defaults.real_proxy_class->supertypes && mono_class_has_parent_fast (vt->klass, mono_defaults.real_proxy_class)) {
787 MonoObject *server = ((MonoRealProxy*)start)->unwrapped_server;
789 /* The server could already have been zeroed out, so
790 we need to check for that, too. */
791 if (server && (!SGEN_LOAD_VTABLE (server) || mono_object_domain (server) == domain)) {
792 SGEN_LOG (4, "Cleaning up remote pointer in %p to object %p", start, server);
793 ((MonoRealProxy*)start)->unwrapped_server = NULL;
800 clear_domain_process_object (GCObject *obj, MonoDomain *domain)
804 process_object_for_domain_clearing (obj, domain);
805 remove = need_remove_object_for_domain (obj, domain);
807 if (remove && obj->synchronisation) {
808 guint32 dislink = mono_monitor_get_object_monitor_gchandle (obj);
810 mono_gchandle_free (dislink);
817 clear_domain_process_minor_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
819 if (clear_domain_process_object (obj, domain)) {
820 CANARIFY_SIZE (size);
821 memset (obj, 0, size);
826 clear_domain_process_major_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
828 clear_domain_process_object (obj, domain);
832 clear_domain_free_major_non_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
834 if (need_remove_object_for_domain (obj, domain))
835 major_collector.free_non_pinned_object (obj, size);
839 clear_domain_free_major_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
841 if (need_remove_object_for_domain (obj, domain))
842 major_collector.free_pinned_object (obj, size);
846 * When appdomains are unloaded we can easily remove objects that have finalizers,
847 * but all the others could still be present in random places on the heap.
848 * We need a sweep to get rid of them even though it's going to be costly
850 * The reason we need to remove them is because we access the vtable and class
851 * structures to know the object size and the reference bitmap: once the domain is
852 * unloaded the point to random memory.
855 mono_gc_clear_domain (MonoDomain * domain)
857 LOSObject *bigobj, *prev;
862 binary_protocol_domain_unload_begin (domain);
866 if (sgen_concurrent_collection_in_progress ())
867 sgen_perform_collection (0, GENERATION_OLD, "clear domain", TRUE, FALSE);
868 SGEN_ASSERT (0, !sgen_concurrent_collection_in_progress (), "We just ordered a synchronous collection. Why are we collecting concurrently?");
870 major_collector.finish_sweeping ();
872 sgen_process_fin_stage_entries ();
874 sgen_clear_nursery_fragments ();
876 FOREACH_THREAD (info) {
877 mono_handle_stack_free_domain ((HandleStack*)info->client_info.info.handle_stack, domain);
880 if (sgen_mono_xdomain_checks && domain != mono_get_root_domain ()) {
881 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_NORMAL);
882 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_WBARRIER);
883 sgen_check_for_xdomain_refs ();
886 /*Ephemerons and dislinks must be processed before LOS since they might end up pointing
887 to memory returned to the OS.*/
888 null_ephemerons_for_domain (domain);
889 sgen_null_links_for_domain (domain);
891 for (i = GENERATION_NURSERY; i < GENERATION_MAX; ++i)
892 sgen_remove_finalizers_if (object_in_domain_predicate, domain, i);
894 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
895 (IterateObjectCallbackFunc)clear_domain_process_minor_object_callback, domain, FALSE, TRUE);
897 /* We need two passes over major and large objects because
898 freeing such objects might give their memory back to the OS
899 (in the case of large objects) or obliterate its vtable
900 (pinned objects with major-copying or pinned and non-pinned
901 objects with major-mark&sweep), but we might need to
902 dereference a pointer from an object to another object if
903 the first object is a proxy. */
904 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, (IterateObjectCallbackFunc)clear_domain_process_major_object_callback, domain);
905 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
906 clear_domain_process_object ((GCObject*)bigobj->data, domain);
909 for (bigobj = los_object_list; bigobj;) {
910 if (need_remove_object_for_domain ((GCObject*)bigobj->data, domain)) {
911 LOSObject *to_free = bigobj;
913 prev->next = bigobj->next;
915 los_object_list = bigobj->next;
916 bigobj = bigobj->next;
917 SGEN_LOG (4, "Freeing large object %p", bigobj->data);
918 sgen_los_free_object (to_free);
922 bigobj = bigobj->next;
924 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_NON_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_non_pinned_object_callback, domain);
925 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_pinned_object_callback, domain);
927 if (domain == mono_get_root_domain ()) {
928 sgen_pin_stats_report ();
929 sgen_object_layout_dump (stdout);
932 sgen_restart_world (0);
934 binary_protocol_domain_unload_end (domain);
935 binary_protocol_flush_buffers (FALSE);
945 mono_gc_alloc_obj (MonoVTable *vtable, size_t size)
947 MonoObject *obj = sgen_alloc_obj (vtable, size);
949 if (G_UNLIKELY (mono_profiler_allocations_enabled ()) && obj)
950 MONO_PROFILER_RAISE (gc_allocation, (obj));
956 mono_gc_alloc_pinned_obj (MonoVTable *vtable, size_t size)
958 MonoObject *obj = sgen_alloc_obj_pinned (vtable, size);
960 if (G_UNLIKELY (mono_profiler_allocations_enabled ()) && obj)
961 MONO_PROFILER_RAISE (gc_allocation, (obj));
967 mono_gc_alloc_mature (MonoVTable *vtable, size_t size)
969 MonoObject *obj = sgen_alloc_obj_mature (vtable, size);
971 if (G_UNLIKELY (mono_profiler_allocations_enabled ()) && obj)
972 MONO_PROFILER_RAISE (gc_allocation, (obj));
978 * mono_gc_alloc_fixed:
981 mono_gc_alloc_fixed (size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
983 /* FIXME: do a single allocation */
984 void *res = g_calloc (1, size);
987 if (!mono_gc_register_root ((char *)res, size, descr, source, msg)) {
995 * mono_gc_free_fixed:
998 mono_gc_free_fixed (void* addr)
1000 mono_gc_deregister_root ((char *)addr);
1008 static MonoMethod* alloc_method_cache [ATYPE_NUM];
1009 static MonoMethod* slowpath_alloc_method_cache [ATYPE_NUM];
1010 static MonoMethod* profiler_alloc_method_cache [ATYPE_NUM];
1011 static gboolean use_managed_allocator = TRUE;
1013 #ifdef MANAGED_ALLOCATION
1014 // Cache the SgenThreadInfo pointer in a local 'var'.
1015 #define EMIT_TLS_ACCESS_VAR(mb, var) \
1017 var = mono_mb_add_local ((mb), &mono_defaults.int_class->byval_arg); \
1018 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1019 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1020 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1021 mono_mb_emit_stloc ((mb), (var)); \
1024 #define EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR(mb, var) \
1026 mono_mb_emit_ldloc ((mb), (var)); \
1027 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenClientThreadInfo, in_critical_region)); \
1028 mono_mb_emit_byte ((mb), CEE_ADD); \
1031 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb, var) do { \
1032 mono_mb_emit_ldloc ((mb), (var)); \
1033 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_next)); \
1034 mono_mb_emit_byte ((mb), CEE_ADD); \
1037 #define EMIT_TLS_ACCESS_TEMP_END(mb, var) do { \
1038 mono_mb_emit_ldloc ((mb), (var)); \
1039 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_temp_end)); \
1040 mono_mb_emit_byte ((mb), CEE_ADD); \
1041 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1044 /* FIXME: Do this in the JIT, where specialized allocation sequences can be created
1045 * for each class. This is currently not easy to do, as it is hard to generate basic
1046 * blocks + branches, but it is easy with the linear IL codebase.
1048 * For this to work we'd need to solve the TLAB race, first. Now we
1049 * require the allocator to be in a few known methods to make sure
1050 * that they are executed atomically via the restart mechanism.
1053 create_allocator (int atype, ManagedAllocatorVariant variant)
1055 int p_var, size_var, real_size_var, thread_var G_GNUC_UNUSED;
1056 gboolean slowpath = variant == MANAGED_ALLOCATOR_SLOW_PATH;
1057 gboolean profiler = variant == MANAGED_ALLOCATOR_PROFILER;
1058 guint32 fastpath_branch, max_size_branch, no_oom_branch;
1059 MonoMethodBuilder *mb;
1061 MonoMethodSignature *csig;
1062 static gboolean registered = FALSE;
1063 int tlab_next_addr_var, new_next_var;
1064 const char *name = NULL;
1069 mono_register_jit_icall (mono_gc_alloc_obj, "mono_gc_alloc_obj", mono_create_icall_signature ("object ptr int"), FALSE);
1070 mono_register_jit_icall (mono_gc_alloc_vector, "mono_gc_alloc_vector", mono_create_icall_signature ("object ptr int int"), FALSE);
1071 mono_register_jit_icall (mono_gc_alloc_string, "mono_gc_alloc_string", mono_create_icall_signature ("object ptr int int32"), FALSE);
1072 mono_register_jit_icall (mono_profiler_raise_gc_allocation, "mono_profiler_raise_gc_allocation", mono_create_icall_signature ("void object"), FALSE);
1076 if (atype == ATYPE_SMALL) {
1077 name = slowpath ? "SlowAllocSmall" : (profiler ? "ProfilerAllocSmall" : "AllocSmall");
1078 } else if (atype == ATYPE_NORMAL) {
1079 name = slowpath ? "SlowAlloc" : (profiler ? "ProfilerAlloc" : "Alloc");
1080 } else if (atype == ATYPE_VECTOR) {
1081 name = slowpath ? "SlowAllocVector" : (profiler ? "ProfilerAllocVector" : "AllocVector");
1082 } else if (atype == ATYPE_STRING) {
1083 name = slowpath ? "SlowAllocString" : (profiler ? "ProfilerAllocString" : "AllocString");
1085 g_assert_not_reached ();
1088 if (atype == ATYPE_NORMAL)
1093 csig = mono_metadata_signature_alloc (mono_defaults.corlib, num_params);
1094 if (atype == ATYPE_STRING) {
1095 csig->ret = &mono_defaults.string_class->byval_arg;
1096 csig->params [0] = &mono_defaults.int_class->byval_arg;
1097 csig->params [1] = &mono_defaults.int32_class->byval_arg;
1099 csig->ret = &mono_defaults.object_class->byval_arg;
1100 for (i = 0; i < num_params; i++)
1101 csig->params [i] = &mono_defaults.int_class->byval_arg;
1104 mb = mono_mb_new (mono_defaults.object_class, name, MONO_WRAPPER_ALLOC);
1111 mono_mb_emit_ldarg (mb, 0);
1112 mono_mb_emit_icall (mb, ves_icall_object_new_specific);
1115 mono_mb_emit_ldarg (mb, 0);
1116 mono_mb_emit_ldarg (mb, 1);
1117 mono_mb_emit_icall (mb, ves_icall_array_new_specific);
1120 mono_mb_emit_ldarg (mb, 1);
1121 mono_mb_emit_icall (mb, ves_icall_string_alloc);
1124 g_assert_not_reached ();
1131 * Tls access might call foreign code or code without jinfo. This can
1132 * only happen if we are outside of the critical region.
1134 EMIT_TLS_ACCESS_VAR (mb, thread_var);
1136 size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1137 if (atype == ATYPE_SMALL) {
1138 /* size_var = size_arg */
1139 mono_mb_emit_ldarg (mb, 1);
1140 mono_mb_emit_stloc (mb, size_var);
1141 } else if (atype == ATYPE_NORMAL) {
1142 /* size = vtable->klass->instance_size; */
1143 mono_mb_emit_ldarg (mb, 0);
1144 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1145 mono_mb_emit_byte (mb, CEE_ADD);
1146 mono_mb_emit_byte (mb, CEE_LDIND_I);
1147 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, instance_size));
1148 mono_mb_emit_byte (mb, CEE_ADD);
1149 /* FIXME: assert instance_size stays a 4 byte integer */
1150 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1151 mono_mb_emit_byte (mb, CEE_CONV_I);
1152 mono_mb_emit_stloc (mb, size_var);
1153 } else if (atype == ATYPE_VECTOR) {
1154 MonoExceptionClause *clause;
1155 int pos, pos_leave, pos_error;
1156 MonoClass *oom_exc_class;
1160 * n > MONO_ARRAY_MAX_INDEX => OutOfMemoryException
1161 * n < 0 => OverflowException
1163 * We can do an unsigned comparison to catch both cases, then in the error
1164 * case compare signed to distinguish between them.
1166 mono_mb_emit_ldarg (mb, 1);
1167 mono_mb_emit_icon (mb, MONO_ARRAY_MAX_INDEX);
1168 mono_mb_emit_byte (mb, CEE_CONV_U);
1169 pos = mono_mb_emit_short_branch (mb, CEE_BLE_UN_S);
1171 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1172 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1173 mono_mb_emit_ldarg (mb, 1);
1174 mono_mb_emit_icon (mb, 0);
1175 pos_error = mono_mb_emit_short_branch (mb, CEE_BLT_S);
1176 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1177 mono_mb_patch_short_branch (mb, pos_error);
1178 mono_mb_emit_exception (mb, "OverflowException", NULL);
1180 mono_mb_patch_short_branch (mb, pos);
1182 clause = (MonoExceptionClause *)mono_image_alloc0 (mono_defaults.corlib, sizeof (MonoExceptionClause));
1183 clause->try_offset = mono_mb_get_label (mb);
1185 /* vtable->klass->sizes.element_size */
1186 mono_mb_emit_ldarg (mb, 0);
1187 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1188 mono_mb_emit_byte (mb, CEE_ADD);
1189 mono_mb_emit_byte (mb, CEE_LDIND_I);
1190 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, sizes));
1191 mono_mb_emit_byte (mb, CEE_ADD);
1192 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1193 mono_mb_emit_byte (mb, CEE_CONV_I);
1196 mono_mb_emit_ldarg (mb, 1);
1197 mono_mb_emit_byte (mb, CEE_MUL_OVF_UN);
1198 /* + sizeof (MonoArray) */
1199 mono_mb_emit_icon (mb, MONO_SIZEOF_MONO_ARRAY);
1200 mono_mb_emit_byte (mb, CEE_ADD_OVF_UN);
1201 mono_mb_emit_stloc (mb, size_var);
1203 pos_leave = mono_mb_emit_branch (mb, CEE_LEAVE);
1206 clause->flags = MONO_EXCEPTION_CLAUSE_NONE;
1207 clause->try_len = mono_mb_get_pos (mb) - clause->try_offset;
1208 clause->data.catch_class = mono_class_load_from_name (mono_defaults.corlib,
1209 "System", "OverflowException");
1210 clause->handler_offset = mono_mb_get_label (mb);
1212 oom_exc_class = mono_class_load_from_name (mono_defaults.corlib,
1213 "System", "OutOfMemoryException");
1214 ctor = mono_class_get_method_from_name (oom_exc_class, ".ctor", 0);
1217 mono_mb_emit_byte (mb, CEE_POP);
1218 mono_mb_emit_op (mb, CEE_NEWOBJ, ctor);
1219 mono_mb_emit_byte (mb, CEE_THROW);
1221 clause->handler_len = mono_mb_get_pos (mb) - clause->handler_offset;
1222 mono_mb_set_clauses (mb, 1, clause);
1223 mono_mb_patch_branch (mb, pos_leave);
1225 } else if (atype == ATYPE_STRING) {
1229 * a string allocator method takes the args: (vtable, len)
1231 * bytes = offsetof (MonoString, chars) + ((len + 1) * 2)
1235 * bytes <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1239 * offsetof (MonoString, chars) + ((len + 1) * 2) <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1240 * len <= (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - offsetof (MonoString, chars)) / 2 - 1
1242 mono_mb_emit_ldarg (mb, 1);
1243 mono_mb_emit_icon (mb, (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - MONO_STRUCT_OFFSET (MonoString, chars)) / 2 - 1);
1244 pos = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
1246 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1247 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1248 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1249 mono_mb_patch_short_branch (mb, pos);
1251 mono_mb_emit_ldarg (mb, 1);
1252 mono_mb_emit_icon (mb, 1);
1253 mono_mb_emit_byte (mb, MONO_CEE_SHL);
1254 //WE manually fold the above + 2 here
1255 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, chars) + 2);
1256 mono_mb_emit_byte (mb, CEE_ADD);
1257 mono_mb_emit_stloc (mb, size_var);
1259 g_assert_not_reached ();
1262 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1263 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1264 mono_mb_emit_byte (mb, CEE_LDC_I4_1);
1265 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1266 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1267 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_NONE);
1270 if (nursery_canaries_enabled ()) {
1271 real_size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1272 mono_mb_emit_ldloc (mb, size_var);
1273 mono_mb_emit_stloc(mb, real_size_var);
1276 real_size_var = size_var;
1278 /* size += ALLOC_ALIGN - 1; */
1279 mono_mb_emit_ldloc (mb, size_var);
1280 mono_mb_emit_icon (mb, SGEN_ALLOC_ALIGN - 1);
1281 mono_mb_emit_byte (mb, CEE_ADD);
1282 /* size &= ~(ALLOC_ALIGN - 1); */
1283 mono_mb_emit_icon (mb, ~(SGEN_ALLOC_ALIGN - 1));
1284 mono_mb_emit_byte (mb, CEE_AND);
1285 mono_mb_emit_stloc (mb, size_var);
1287 /* if (size > MAX_SMALL_OBJ_SIZE) goto slowpath */
1288 if (atype != ATYPE_SMALL) {
1289 mono_mb_emit_ldloc (mb, size_var);
1290 mono_mb_emit_icon (mb, SGEN_MAX_SMALL_OBJ_SIZE);
1291 max_size_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
1295 * We need to modify tlab_next, but the JIT only supports reading, so we read
1296 * another tls var holding its address instead.
1299 /* tlab_next_addr (local) = tlab_next_addr (TLS var) */
1300 tlab_next_addr_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1301 EMIT_TLS_ACCESS_NEXT_ADDR (mb, thread_var);
1302 mono_mb_emit_stloc (mb, tlab_next_addr_var);
1304 /* p = (void**)tlab_next; */
1305 p_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1306 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1307 mono_mb_emit_byte (mb, CEE_LDIND_I);
1308 mono_mb_emit_stloc (mb, p_var);
1310 /* new_next = (char*)p + size; */
1311 new_next_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1312 mono_mb_emit_ldloc (mb, p_var);
1313 mono_mb_emit_ldloc (mb, size_var);
1314 mono_mb_emit_byte (mb, CEE_CONV_I);
1315 mono_mb_emit_byte (mb, CEE_ADD);
1317 if (nursery_canaries_enabled ()) {
1318 mono_mb_emit_icon (mb, CANARY_SIZE);
1319 mono_mb_emit_byte (mb, CEE_ADD);
1321 mono_mb_emit_stloc (mb, new_next_var);
1323 /* if (G_LIKELY (new_next < tlab_temp_end)) */
1324 mono_mb_emit_ldloc (mb, new_next_var);
1325 EMIT_TLS_ACCESS_TEMP_END (mb, thread_var);
1326 fastpath_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
1329 if (atype != ATYPE_SMALL)
1330 mono_mb_patch_short_branch (mb, max_size_branch);
1332 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1333 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1335 * We are no longer in a critical section. We need to do this before calling
1336 * to unmanaged land in order to avoid stw deadlocks since unmanaged code
1339 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1340 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1341 mono_mb_emit_byte (mb, CEE_LDC_I4_0);
1342 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1343 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1344 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_NONE);
1347 /* FIXME: mono_gc_alloc_obj takes a 'size_t' as an argument, not an int32 */
1348 mono_mb_emit_ldarg (mb, 0);
1349 mono_mb_emit_ldloc (mb, real_size_var);
1350 if (atype == ATYPE_NORMAL || atype == ATYPE_SMALL) {
1351 mono_mb_emit_icall (mb, mono_gc_alloc_obj);
1352 } else if (atype == ATYPE_VECTOR) {
1353 mono_mb_emit_ldarg (mb, 1);
1354 mono_mb_emit_icall (mb, mono_gc_alloc_vector);
1355 } else if (atype == ATYPE_STRING) {
1356 mono_mb_emit_ldarg (mb, 1);
1357 mono_mb_emit_icall (mb, mono_gc_alloc_string);
1359 g_assert_not_reached ();
1362 /* if (ret == NULL) throw OOM; */
1363 mono_mb_emit_byte (mb, CEE_DUP);
1364 no_oom_branch = mono_mb_emit_branch (mb, CEE_BRTRUE);
1365 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1367 mono_mb_patch_branch (mb, no_oom_branch);
1368 mono_mb_emit_byte (mb, CEE_RET);
1371 mono_mb_patch_short_branch (mb, fastpath_branch);
1373 /* FIXME: Memory barrier */
1375 /* tlab_next = new_next */
1376 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1377 mono_mb_emit_ldloc (mb, new_next_var);
1378 mono_mb_emit_byte (mb, CEE_STIND_I);
1381 mono_mb_emit_ldloc (mb, p_var);
1382 mono_mb_emit_ldarg (mb, 0);
1383 mono_mb_emit_byte (mb, CEE_STIND_I);
1385 /* mark object end with nursery word */
1386 if (nursery_canaries_enabled ()) {
1387 mono_mb_emit_ldloc (mb, p_var);
1388 mono_mb_emit_ldloc (mb, real_size_var);
1389 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1390 mono_mb_emit_icon8 (mb, (mword) CANARY_STRING);
1391 mono_mb_emit_icon (mb, CANARY_SIZE);
1392 mono_mb_emit_byte (mb, MONO_CEE_PREFIX1);
1393 mono_mb_emit_byte (mb, CEE_CPBLK);
1396 if (atype == ATYPE_VECTOR) {
1397 /* arr->max_length = max_length; */
1398 mono_mb_emit_ldloc (mb, p_var);
1399 mono_mb_emit_ldflda (mb, MONO_STRUCT_OFFSET (MonoArray, max_length));
1400 mono_mb_emit_ldarg (mb, 1);
1401 #ifdef MONO_BIG_ARRAYS
1402 mono_mb_emit_byte (mb, CEE_STIND_I);
1404 mono_mb_emit_byte (mb, CEE_STIND_I4);
1406 } else if (atype == ATYPE_STRING) {
1407 /* need to set length and clear the last char */
1408 /* s->length = len; */
1409 mono_mb_emit_ldloc (mb, p_var);
1410 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, length));
1411 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1412 mono_mb_emit_ldarg (mb, 1);
1413 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
1416 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1417 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1418 mono_mb_emit_byte (mb, CEE_LDC_I4_0);
1419 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1420 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1422 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1423 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1426 We must make sure both vtable and max_length are globaly visible before returning to managed land.
1428 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1431 mono_mb_emit_ldloc (mb, p_var);
1436 * It's important that we do this outside of the critical region as we
1437 * will be invoking arbitrary code.
1441 * if (G_UNLIKELY (*&mono_profiler_state.gc_allocation_count)) {
1442 * mono_profiler_raise_gc_allocation (p);
1446 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1447 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_PROFILER_ALLOCATION_COUNT);
1448 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1450 int prof_br = mono_mb_emit_short_branch (mb, CEE_BRFALSE_S);
1452 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1453 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1454 mono_mb_emit_byte (mb, CEE_DUP);
1455 mono_mb_emit_icall (mb, mono_profiler_raise_gc_allocation);
1457 mono_mb_patch_short_branch (mb, prof_br);
1460 mono_mb_emit_byte (mb, CEE_RET);
1463 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
1464 info->d.alloc.gc_name = "sgen";
1465 info->d.alloc.alloc_type = atype;
1468 mb->init_locals = FALSE;
1471 res = mono_mb_create (mb, csig, 8, info);
1480 mono_gc_get_aligned_size_for_allocator (int size)
1482 return SGEN_ALIGN_UP (size);
1486 * Generate an allocator method implementing the fast path of mono_gc_alloc_obj ().
1487 * The signature of the called method is:
1488 * object allocate (MonoVTable *vtable)
1491 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box, gboolean known_instance_size)
1493 #ifdef MANAGED_ALLOCATION
1494 ManagedAllocatorVariant variant = mono_profiler_allocations_enabled () ?
1495 MANAGED_ALLOCATOR_PROFILER : MANAGED_ALLOCATOR_REGULAR;
1497 if (collect_before_allocs)
1499 if (klass->instance_size > tlab_size)
1501 if (known_instance_size && ALIGN_TO (klass->instance_size, SGEN_ALLOC_ALIGN) >= SGEN_MAX_SMALL_OBJ_SIZE)
1503 if (mono_class_has_finalizer (klass) || mono_class_is_marshalbyref (klass))
1507 if (klass->byval_arg.type == MONO_TYPE_STRING)
1508 return mono_gc_get_managed_allocator_by_type (ATYPE_STRING, variant);
1509 /* Generic classes have dynamic field and can go above MAX_SMALL_OBJ_SIZE. */
1510 if (known_instance_size)
1511 return mono_gc_get_managed_allocator_by_type (ATYPE_SMALL, variant);
1513 return mono_gc_get_managed_allocator_by_type (ATYPE_NORMAL, variant);
1520 mono_gc_get_managed_array_allocator (MonoClass *klass)
1522 #ifdef MANAGED_ALLOCATION
1523 if (klass->rank != 1)
1525 if (has_per_allocation_action)
1527 g_assert (!mono_class_has_finalizer (klass) && !mono_class_is_marshalbyref (klass));
1529 return mono_gc_get_managed_allocator_by_type (ATYPE_VECTOR, mono_profiler_allocations_enabled () ?
1530 MANAGED_ALLOCATOR_PROFILER : MANAGED_ALLOCATOR_REGULAR);
1537 sgen_set_use_managed_allocator (gboolean flag)
1539 use_managed_allocator = flag;
1543 mono_gc_get_managed_allocator_by_type (int atype, ManagedAllocatorVariant variant)
1545 #ifdef MANAGED_ALLOCATION
1549 if (variant != MANAGED_ALLOCATOR_SLOW_PATH && !use_managed_allocator)
1553 case MANAGED_ALLOCATOR_REGULAR: cache = alloc_method_cache; break;
1554 case MANAGED_ALLOCATOR_SLOW_PATH: cache = slowpath_alloc_method_cache; break;
1555 case MANAGED_ALLOCATOR_PROFILER: cache = profiler_alloc_method_cache; break;
1556 default: g_assert_not_reached (); break;
1559 res = cache [atype];
1563 res = create_allocator (atype, variant);
1565 if (cache [atype]) {
1566 mono_free_method (res);
1567 res = cache [atype];
1569 mono_memory_barrier ();
1570 cache [atype] = res;
1581 mono_gc_get_managed_allocator_types (void)
1587 sgen_is_managed_allocator (MonoMethod *method)
1591 for (i = 0; i < ATYPE_NUM; ++i)
1592 if (method == alloc_method_cache [i] || method == slowpath_alloc_method_cache [i] || method == profiler_alloc_method_cache [i])
1598 sgen_has_managed_allocator (void)
1602 for (i = 0; i < ATYPE_NUM; ++i)
1603 if (alloc_method_cache [i] || slowpath_alloc_method_cache [i] || profiler_alloc_method_cache [i])
1608 #define ARRAY_OBJ_INDEX(ptr,array,elem_size) (((char*)(ptr) - ((char*)(array) + G_STRUCT_OFFSET (MonoArray, vector))) / (elem_size))
1611 sgen_client_cardtable_scan_object (GCObject *obj, guint8 *cards, ScanCopyContext ctx)
1613 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
1614 MonoClass *klass = vt->klass;
1616 SGEN_ASSERT (0, SGEN_VTABLE_HAS_REFERENCES (vt), "Why would we ever call this on reference-free objects?");
1619 MonoArray *arr = (MonoArray*)obj;
1620 guint8 *card_data, *card_base;
1621 guint8 *card_data_end;
1622 char *obj_start = (char *)sgen_card_table_align_pointer (obj);
1624 mword obj_size = sgen_mono_array_size (vt, arr, &bounds_size, sgen_vtable_get_descriptor (vt));
1625 /* We don't want to scan the bounds entries at the end of multidimensional arrays */
1626 char *obj_end = (char*)obj + obj_size - bounds_size;
1628 size_t extra_idx = 0;
1630 mword desc = (mword)klass->element_class->gc_descr;
1631 int elem_size = mono_array_element_size (klass);
1633 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1634 guint8 *overflow_scan_end = NULL;
1637 #ifdef SGEN_OBJECT_LAYOUT_STATISTICS
1638 if (klass->element_class->valuetype)
1639 sgen_object_layout_scanned_vtype_array ();
1641 sgen_object_layout_scanned_ref_array ();
1647 card_data = sgen_card_table_get_card_scan_address ((mword)obj);
1649 card_base = card_data;
1650 card_count = sgen_card_table_number_of_cards_in_range ((mword)obj, obj_size);
1651 card_data_end = card_data + card_count;
1654 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1655 /*Check for overflow and if so, setup to scan in two steps*/
1656 if (!cards && card_data_end >= SGEN_SHADOW_CARDTABLE_END) {
1657 overflow_scan_end = sgen_shadow_cardtable + (card_data_end - SGEN_SHADOW_CARDTABLE_END);
1658 card_data_end = SGEN_SHADOW_CARDTABLE_END;
1664 card_data = sgen_find_next_card (card_data, card_data_end);
1665 for (; card_data < card_data_end; card_data = sgen_find_next_card (card_data + 1, card_data_end)) {
1667 size_t idx = (card_data - card_base) + extra_idx;
1668 char *start = (char*)(obj_start + idx * CARD_SIZE_IN_BYTES);
1669 char *card_end = start + CARD_SIZE_IN_BYTES;
1670 char *first_elem, *elem;
1672 HEAVY_STAT (++los_marked_cards);
1675 sgen_card_table_prepare_card_for_scanning (card_data);
1677 card_end = MIN (card_end, obj_end);
1679 if (start <= (char*)arr->vector)
1682 index = ARRAY_OBJ_INDEX (start, obj, elem_size);
1684 elem = first_elem = (char*)mono_array_addr_with_size_fast ((MonoArray*)obj, elem_size, index);
1685 if (klass->element_class->valuetype) {
1686 ScanVTypeFunc scan_vtype_func = ctx.ops->scan_vtype;
1688 for (; elem < card_end; elem += elem_size)
1689 scan_vtype_func (obj, elem, desc, ctx.queue BINARY_PROTOCOL_ARG (elem_size));
1691 ScanPtrFieldFunc scan_ptr_field_func = ctx.ops->scan_ptr_field;
1693 HEAVY_STAT (++los_array_cards);
1694 for (; elem < card_end; elem += SIZEOF_VOID_P)
1695 scan_ptr_field_func (obj, (GCObject**)elem, ctx.queue);
1698 binary_protocol_card_scan (first_elem, elem - first_elem);
1701 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1702 if (overflow_scan_end) {
1703 extra_idx = card_data - card_base;
1704 card_base = card_data = sgen_shadow_cardtable;
1705 card_data_end = overflow_scan_end;
1706 overflow_scan_end = NULL;
1717 * Array and string allocation
1721 mono_gc_alloc_vector (MonoVTable *vtable, size_t size, uintptr_t max_length)
1726 if (!SGEN_CAN_ALIGN_UP (size))
1729 #ifndef DISABLE_CRITICAL_REGION
1730 ENTER_CRITICAL_REGION;
1731 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1733 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1734 arr->max_length = (mono_array_size_t)max_length;
1735 EXIT_CRITICAL_REGION;
1738 EXIT_CRITICAL_REGION;
1743 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1744 if (G_UNLIKELY (!arr)) {
1749 arr->max_length = (mono_array_size_t)max_length;
1754 if (G_UNLIKELY (mono_profiler_allocations_enabled ()))
1755 MONO_PROFILER_RAISE (gc_allocation, (&arr->obj));
1757 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Vector has incorrect size.");
1762 mono_gc_alloc_array (MonoVTable *vtable, size_t size, uintptr_t max_length, uintptr_t bounds_size)
1765 MonoArrayBounds *bounds;
1768 if (!SGEN_CAN_ALIGN_UP (size))
1771 #ifndef DISABLE_CRITICAL_REGION
1772 ENTER_CRITICAL_REGION;
1773 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1775 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1776 arr->max_length = (mono_array_size_t)max_length;
1778 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1779 arr->bounds = bounds;
1780 EXIT_CRITICAL_REGION;
1783 EXIT_CRITICAL_REGION;
1788 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1789 if (G_UNLIKELY (!arr)) {
1794 arr->max_length = (mono_array_size_t)max_length;
1796 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1797 arr->bounds = bounds;
1802 if (G_UNLIKELY (mono_profiler_allocations_enabled ()))
1803 MONO_PROFILER_RAISE (gc_allocation, (&arr->obj));
1805 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Array has incorrect size.");
1810 mono_gc_alloc_string (MonoVTable *vtable, size_t size, gint32 len)
1815 if (!SGEN_CAN_ALIGN_UP (size))
1818 #ifndef DISABLE_CRITICAL_REGION
1819 ENTER_CRITICAL_REGION;
1820 str = (MonoString*)sgen_try_alloc_obj_nolock (vtable, size);
1822 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1824 EXIT_CRITICAL_REGION;
1827 EXIT_CRITICAL_REGION;
1832 str = (MonoString*)sgen_alloc_obj_nolock (vtable, size);
1833 if (G_UNLIKELY (!str)) {
1843 if (G_UNLIKELY (mono_profiler_allocations_enabled ()))
1844 MONO_PROFILER_RAISE (gc_allocation, (&str->object));
1854 mono_gc_set_string_length (MonoString *str, gint32 new_length)
1856 mono_unichar2 *new_end = str->chars + new_length;
1858 /* zero the discarded string. This null-delimits the string and allows
1859 * the space to be reclaimed by SGen. */
1861 if (nursery_canaries_enabled () && sgen_ptr_in_nursery (str)) {
1862 CHECK_CANARY_FOR_OBJECT ((GCObject*)str, TRUE);
1863 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2) + CANARY_SIZE);
1864 memcpy (new_end + 1 , CANARY_STRING, CANARY_SIZE);
1866 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2));
1869 str->length = new_length;
1876 #define GC_ROOT_NUM 32
1878 int count; /* must be the first field */
1879 void *objects [GC_ROOT_NUM];
1880 int root_types [GC_ROOT_NUM];
1881 uintptr_t extra_info [GC_ROOT_NUM];
1885 notify_gc_roots (GCRootReport *report)
1889 MONO_PROFILER_RAISE (gc_roots, ((MonoObject **) report->objects, (MonoProfilerGCRootType *) report->root_types, report->extra_info, report->count));
1894 add_profile_gc_root (GCRootReport *report, void *object, int rtype, uintptr_t extra_info)
1896 if (report->count == GC_ROOT_NUM)
1897 notify_gc_roots (report);
1898 report->objects [report->count] = object;
1899 report->root_types [report->count] = rtype;
1900 report->extra_info [report->count++] = (uintptr_t)SGEN_LOAD_VTABLE (object)->klass;
1904 sgen_client_nursery_objects_pinned (void **definitely_pinned, int count)
1906 if (MONO_PROFILER_ENABLED (gc_roots)) {
1907 GCRootReport report;
1910 for (idx = 0; idx < count; ++idx)
1911 add_profile_gc_root (&report, definitely_pinned [idx], MONO_PROFILER_GC_ROOT_PINNING | MONO_PROFILER_GC_ROOT_MISC, 0);
1912 notify_gc_roots (&report);
1917 report_finalizer_roots_from_queue (SgenPointerQueue *queue)
1919 GCRootReport report;
1923 for (i = 0; i < queue->next_slot; ++i) {
1924 void *obj = queue->data [i];
1927 add_profile_gc_root (&report, obj, MONO_PROFILER_GC_ROOT_FINALIZER, 0);
1929 notify_gc_roots (&report);
1933 report_finalizer_roots (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
1935 report_finalizer_roots_from_queue (fin_ready_queue);
1936 report_finalizer_roots_from_queue (critical_fin_queue);
1939 static GCRootReport *root_report;
1942 single_arg_report_root (MonoObject **obj, void *gc_data)
1945 add_profile_gc_root (root_report, *obj, MONO_PROFILER_GC_ROOT_OTHER, 0);
1949 precisely_report_roots_from (GCRootReport *report, void** start_root, void** end_root, mword desc)
1951 switch (desc & ROOT_DESC_TYPE_MASK) {
1952 case ROOT_DESC_BITMAP:
1953 desc >>= ROOT_DESC_TYPE_SHIFT;
1955 if ((desc & 1) && *start_root) {
1956 add_profile_gc_root (report, *start_root, MONO_PROFILER_GC_ROOT_OTHER, 0);
1962 case ROOT_DESC_COMPLEX: {
1963 gsize *bitmap_data = (gsize *)sgen_get_complex_descriptor_bitmap (desc);
1964 gsize bwords = (*bitmap_data) - 1;
1965 void **start_run = start_root;
1967 while (bwords-- > 0) {
1968 gsize bmap = *bitmap_data++;
1969 void **objptr = start_run;
1971 if ((bmap & 1) && *objptr) {
1972 add_profile_gc_root (report, *objptr, MONO_PROFILER_GC_ROOT_OTHER, 0);
1977 start_run += GC_BITS_PER_WORD;
1981 case ROOT_DESC_VECTOR: {
1984 for (p = start_root; p < end_root; p++) {
1986 add_profile_gc_root (report, *p, MONO_PROFILER_GC_ROOT_OTHER, 0);
1990 case ROOT_DESC_USER: {
1991 MonoGCRootMarkFunc marker = (MonoGCRootMarkFunc)sgen_get_user_descriptor_func (desc);
1992 root_report = report;
1993 marker ((MonoObject**)start_root, single_arg_report_root, NULL);
1996 case ROOT_DESC_RUN_LEN:
1997 g_assert_not_reached ();
1999 g_assert_not_reached ();
2004 report_registered_roots_by_type (int root_type)
2006 GCRootReport report;
2010 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], void **, start_root, RootRecord *, root) {
2011 SGEN_LOG (6, "Precise root scan %p-%p (desc: %p)", start_root, root->end_root, (void*)root->root_desc);
2012 precisely_report_roots_from (&report, start_root, (void**)root->end_root, root->root_desc);
2013 } SGEN_HASH_TABLE_FOREACH_END;
2014 notify_gc_roots (&report);
2018 report_registered_roots (void)
2020 report_registered_roots_by_type (ROOT_TYPE_NORMAL);
2021 report_registered_roots_by_type (ROOT_TYPE_WBARRIER);
2025 sgen_client_collecting_minor (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2027 if (MONO_PROFILER_ENABLED (gc_roots))
2028 report_registered_roots ();
2030 if (MONO_PROFILER_ENABLED (gc_roots))
2031 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2034 static GCRootReport major_root_report;
2035 static gboolean profile_roots;
2038 sgen_client_collecting_major_1 (void)
2040 profile_roots = MONO_PROFILER_ENABLED (gc_roots);
2041 memset (&major_root_report, 0, sizeof (GCRootReport));
2045 sgen_client_pinned_los_object (GCObject *obj)
2048 add_profile_gc_root (&major_root_report, (char*)obj, MONO_PROFILER_GC_ROOT_PINNING | MONO_PROFILER_GC_ROOT_MISC, 0);
2052 sgen_client_collecting_major_2 (void)
2055 notify_gc_roots (&major_root_report);
2057 if (MONO_PROFILER_ENABLED (gc_roots))
2058 report_registered_roots ();
2062 sgen_client_collecting_major_3 (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2064 if (MONO_PROFILER_ENABLED (gc_roots))
2065 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2068 #define MOVED_OBJECTS_NUM 64
2069 static void *moved_objects [MOVED_OBJECTS_NUM];
2070 static int moved_objects_idx = 0;
2072 static SgenPointerQueue moved_objects_queue = SGEN_POINTER_QUEUE_INIT (INTERNAL_MEM_MOVED_OBJECT);
2075 mono_sgen_register_moved_object (void *obj, void *destination)
2078 * This function can be called from SGen's worker threads. We want to try
2079 * and avoid exposing those threads to the profiler API, so queue up move
2080 * events and send them later when the main GC thread calls
2081 * mono_sgen_gc_event_moves ().
2083 * TODO: Once SGen has multiple worker threads, we need to switch to a
2084 * lock-free data structure for the queue as multiple threads will be
2085 * adding to it at the same time.
2087 if (sgen_workers_is_worker_thread (mono_native_thread_id_get ())) {
2088 sgen_pointer_queue_add (&moved_objects_queue, obj);
2089 sgen_pointer_queue_add (&moved_objects_queue, destination);
2091 if (moved_objects_idx == MOVED_OBJECTS_NUM) {
2092 MONO_PROFILER_RAISE (gc_moves, ((MonoObject **) moved_objects, moved_objects_idx));
2093 moved_objects_idx = 0;
2096 moved_objects [moved_objects_idx++] = obj;
2097 moved_objects [moved_objects_idx++] = destination;
2102 mono_sgen_gc_event_moves (void)
2104 while (!sgen_pointer_queue_is_empty (&moved_objects_queue)) {
2105 void *dst = sgen_pointer_queue_pop (&moved_objects_queue);
2106 void *src = sgen_pointer_queue_pop (&moved_objects_queue);
2108 mono_sgen_register_moved_object (src, dst);
2111 if (moved_objects_idx) {
2112 MONO_PROFILER_RAISE (gc_moves, ((MonoObject **) moved_objects, moved_objects_idx));
2113 moved_objects_idx = 0;
2121 #define REFS_SIZE 128
2124 MonoGCReferences callback;
2128 MonoObject *refs [REFS_SIZE];
2129 uintptr_t offsets [REFS_SIZE];
2133 #define HANDLE_PTR(ptr,obj) do { \
2135 if (hwi->count == REFS_SIZE) { \
2136 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data); \
2140 hwi->offsets [hwi->count] = (char*)(ptr)-(char*)start; \
2141 hwi->refs [hwi->count++] = *(ptr); \
2146 collect_references (HeapWalkInfo *hwi, GCObject *obj, size_t size)
2148 char *start = (char*)obj;
2149 mword desc = sgen_obj_get_descriptor (obj);
2151 #include "sgen/sgen-scan-object.h"
2155 walk_references (GCObject *start, size_t size, void *data)
2157 HeapWalkInfo *hwi = (HeapWalkInfo *)data;
2160 collect_references (hwi, start, size);
2161 if (hwi->count || !hwi->called)
2162 hwi->callback (start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data);
2166 * mono_gc_walk_heap:
2167 * \param flags flags for future use
2168 * \param callback a function pointer called for each object in the heap
2169 * \param data a user data pointer that is passed to callback
2170 * This function can be used to iterate over all the live objects in the heap;
2171 * for each object, \p callback is invoked, providing info about the object's
2172 * location in memory, its class, its size and the objects it references.
2173 * For each referenced object its offset from the object address is
2174 * reported in the offsets array.
2175 * The object references may be buffered, so the callback may be invoked
2176 * multiple times for the same object: in all but the first call, the size
2177 * argument will be zero.
2178 * Note that this function can be only called in the \c MONO_GC_EVENT_PRE_START_WORLD
2179 * profiler event handler.
2180 * \returns a non-zero value if the GC doesn't support heap walking
2183 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
2188 hwi.callback = callback;
2191 sgen_clear_nursery_fragments ();
2192 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data, walk_references, &hwi, FALSE, TRUE);
2194 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, walk_references, &hwi);
2195 sgen_los_iterate_objects (walk_references, &hwi);
2205 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
2207 gc_callbacks = *callbacks;
2211 mono_gc_get_gc_callbacks ()
2213 return &gc_callbacks;
2217 mono_gc_thread_attach (SgenThreadInfo *info)
2219 return sgen_thread_attach (info);
2223 sgen_client_thread_attach (SgenThreadInfo* info)
2225 mono_tls_set_sgen_thread_info (info);
2227 info->client_info.skip = 0;
2229 info->client_info.stack_start = NULL;
2231 #ifdef SGEN_POSIX_STW
2232 info->client_info.stop_count = -1;
2233 info->client_info.signal = 0;
2236 memset (&info->client_info.ctx, 0, sizeof (MonoContext));
2238 if (mono_gc_get_gc_callbacks ()->thread_attach_func)
2239 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2241 binary_protocol_thread_register ((gpointer)mono_thread_info_get_tid (info));
2243 SGEN_LOG (3, "registered thread %p (%p) stack end %p", info, (gpointer)mono_thread_info_get_tid (info), info->client_info.info.stack_end);
2245 info->client_info.info.handle_stack = mono_handle_stack_alloc ();
2249 mono_gc_thread_detach_with_lock (SgenThreadInfo *info)
2251 return sgen_thread_detach_with_lock (info);
2255 sgen_client_thread_detach_with_lock (SgenThreadInfo *p)
2257 MonoNativeThreadId tid;
2259 mono_tls_set_sgen_thread_info (NULL);
2261 tid = mono_thread_info_get_tid (p);
2263 if (p->client_info.info.runtime_thread)
2264 mono_threads_add_joinable_thread ((gpointer)tid);
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 FOREACH_THREAD (info) {
2366 int skip_reason = 0;
2367 void *aligned_stack_start;
2369 if (info->client_info.skip) {
2370 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);
2372 } else if (info->client_info.gc_disabled) {
2373 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);
2375 } else if (!mono_thread_info_is_live (info)) {
2376 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);
2378 } else if (!info->client_info.stack_start) {
2379 SGEN_LOG (3, "Skipping starting or detaching thread %p", info);
2383 binary_protocol_scan_stack ((gpointer)mono_thread_info_get_tid (info), info->client_info.stack_start, info->client_info.info.stack_end, skip_reason);
2387 /* If we skip a thread with a non-empty handle stack and then it
2388 * resumes running we may potentially move an object but fail to
2389 * update the reference in the handle.
2391 HandleStack *stack = info->client_info.info.handle_stack;
2392 g_assert (stack == NULL || mono_handle_stack_is_empty (stack));
2397 g_assert (info->client_info.stack_start);
2398 g_assert (info->client_info.info.stack_end);
2400 aligned_stack_start = (void*)(mword) ALIGN_TO ((mword)info->client_info.stack_start, SIZEOF_VOID_P);
2402 /* Windows uses a guard page before the committed stack memory pages to detect when the
2403 stack needs to be grown. If we suspend a thread just after a function prolog has
2404 decremented the stack pointer to point into the guard page but before the thread has
2405 been able to read or write to that page, starting the stack scan at aligned_stack_start
2406 will raise a STATUS_GUARD_PAGE_VIOLATION and the process will crash. This code uses
2407 VirtualQuery() to determine whether stack_start points into the guard page and then
2408 updates aligned_stack_start to point at the next non-guard page. */
2409 MEMORY_BASIC_INFORMATION mem_info;
2410 SIZE_T result = VirtualQuery(info->client_info.stack_start, &mem_info, sizeof(mem_info));
2411 g_assert (result != 0);
2412 if (mem_info.Protect & PAGE_GUARD) {
2413 aligned_stack_start = ((char*) mem_info.BaseAddress) + mem_info.RegionSize;
2417 g_assert (info->client_info.suspend_done);
2418 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 ());
2419 if (mono_gc_get_gc_callbacks ()->thread_mark_func && !conservative_stack_mark) {
2420 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);
2421 } else if (!precise) {
2422 if (!conservative_stack_mark) {
2423 fprintf (stderr, "Precise stack mark not supported - disabling.\n");
2424 conservative_stack_mark = TRUE;
2426 //FIXME we should eventually use the new stack_mark from coop
2427 sgen_conservatively_pin_objects_from ((void **)aligned_stack_start, (void **)info->client_info.info.stack_end, start_nursery, end_nursery, PIN_TYPE_STACK);
2431 sgen_conservatively_pin_objects_from ((void**)&info->client_info.ctx, (void**)(&info->client_info.ctx + 1),
2432 start_nursery, end_nursery, PIN_TYPE_STACK);
2435 // This is used on Coop GC for platforms where we cannot get the data for individual registers.
2436 // We force a spill of all registers into the stack and pass a chunk of data into sgen.
2437 //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
2438 MonoThreadUnwindState *state = &info->client_info.info.thread_saved_state [SELF_SUSPEND_STATE_INDEX];
2439 if (state && state->gc_stackdata) {
2440 sgen_conservatively_pin_objects_from ((void **)state->gc_stackdata, (void**)((char*)state->gc_stackdata + state->gc_stackdata_size),
2441 start_nursery, end_nursery, PIN_TYPE_STACK);
2445 if (info->client_info.info.handle_stack) {
2447 Make two passes over the handle stack. On the imprecise pass, pin all
2448 objects where the handle points into the interior of the object. On the
2449 precise pass, copy or mark all the objects that have handles to the
2450 beginning of the object.
2453 mono_handle_stack_scan ((HandleStack*)info->client_info.info.handle_stack, (GcScanFunc)ctx.ops->copy_or_mark_object, ctx.queue, precise);
2455 PinHandleStackInteriorPtrData ud = { .start_nursery = start_nursery,
2456 .end_nursery = end_nursery,
2458 mono_handle_stack_scan ((HandleStack*)info->client_info.info.handle_stack, pin_handle_stack_interior_ptrs, &ud, precise);
2461 } FOREACH_THREAD_END
2465 * mono_gc_set_stack_end:
2467 * Set the end of the current threads stack to STACK_END. The stack space between
2468 * STACK_END and the real end of the threads stack will not be scanned during collections.
2471 mono_gc_set_stack_end (void *stack_end)
2473 SgenThreadInfo *info;
2476 info = mono_thread_info_current ();
2478 SGEN_ASSERT (0, stack_end < info->client_info.info.stack_end, "Can only lower stack end");
2479 info->client_info.info.stack_end = stack_end;
2489 mono_gc_register_root (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2491 return sgen_register_root (start, size, descr, descr ? ROOT_TYPE_NORMAL : ROOT_TYPE_PINNED, source, msg);
2495 mono_gc_register_root_wbarrier (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2497 return sgen_register_root (start, size, descr, ROOT_TYPE_WBARRIER, source, msg);
2501 mono_gc_deregister_root (char* addr)
2503 sgen_deregister_root (addr);
2512 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
2516 mono_threads_join_lock ();
2517 res = pthread_create (new_thread, attr, start_routine, arg);
2518 mono_threads_join_unlock ();
2529 sgen_client_total_allocated_heap_changed (size_t allocated_heap)
2531 mono_runtime_resource_check_limit (MONO_RESOURCE_GC_HEAP, allocated_heap);
2535 mono_gc_user_markers_supported (void)
2541 mono_object_is_alive (MonoObject* o)
2547 mono_gc_get_generation (MonoObject *obj)
2549 if (sgen_ptr_in_nursery (obj))
2555 mono_gc_get_gc_name (void)
2561 mono_gc_get_description (void)
2563 #ifdef HAVE_CONC_GC_AS_DEFAULT
2564 return g_strdup ("sgen (concurrent by default)");
2566 return g_strdup ("sgen");
2571 mono_gc_set_desktop_mode (void)
2576 mono_gc_is_moving (void)
2582 mono_gc_is_disabled (void)
2588 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
2595 mono_gc_max_generation (void)
2601 mono_gc_precise_stack_mark_enabled (void)
2603 return !conservative_stack_mark;
2607 mono_gc_collect (int generation)
2609 sgen_gc_collect (generation);
2613 mono_gc_collection_count (int generation)
2615 return sgen_gc_collection_count (generation);
2619 mono_gc_get_used_size (void)
2621 return (int64_t)sgen_gc_get_used_size ();
2625 mono_gc_get_heap_size (void)
2627 return (int64_t)sgen_gc_get_total_heap_allocation ();
2631 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
2633 return sgen_make_user_root_descriptor (marker);
2637 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
2639 return SGEN_DESC_STRING;
2643 mono_gc_get_nursery (int *shift_bits, size_t *size)
2645 *size = sgen_nursery_size;
2646 *shift_bits = sgen_nursery_bits;
2647 return sgen_get_nursery_start ();
2651 mono_gc_get_los_limit (void)
2653 return SGEN_MAX_SMALL_OBJ_SIZE;
2657 sgen_client_default_metadata (void)
2659 return mono_domain_get ();
2663 sgen_client_metadata_for_object (GCObject *obj)
2665 return mono_object_domain (obj);
2669 * mono_gchandle_new:
2670 * \param obj managed object to get a handle for
2671 * \param pinned whether the object should be pinned
2672 * This returns a handle that wraps the object, this is used to keep a
2673 * reference to a managed object from the unmanaged world and preventing the
2674 * object from being disposed.
2676 * If \p pinned is false the address of the object can not be obtained, if it is
2677 * true the address of the object can be obtained. This will also pin the
2678 * object so it will not be possible by a moving garbage collector to move the
2681 * \returns a handle that can be used to access the object from unmanaged code.
2684 mono_gchandle_new (MonoObject *obj, gboolean pinned)
2686 return sgen_gchandle_new (obj, pinned);
2690 * mono_gchandle_new_weakref:
2691 * \param obj managed object to get a handle for
2692 * \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.
2694 * This returns a weak handle that wraps the object, this is used to
2695 * keep a reference to a managed object from the unmanaged world.
2696 * Unlike the \c mono_gchandle_new the object can be reclaimed by the
2697 * garbage collector. In this case the value of the GCHandle will be
2700 * If \p track_resurrection is TRUE the object will be tracked through
2701 * finalization and if the object is resurrected during the execution
2702 * of the finalizer, then the returned weakref will continue to hold
2703 * a reference to the object. If \p track_resurrection is FALSE, then
2704 * the weak reference's target will become NULL as soon as the object
2705 * is passed on to the finalizer.
2707 * \returns a handle that can be used to access the object from
2711 mono_gchandle_new_weakref (GCObject *obj, gboolean track_resurrection)
2713 return sgen_gchandle_new_weakref (obj, track_resurrection);
2717 * mono_gchandle_is_in_domain:
2718 * \param gchandle a GCHandle's handle.
2719 * \param domain An application domain.
2720 * \returns TRUE if the object wrapped by the \p gchandle belongs to the specific \p domain.
2723 mono_gchandle_is_in_domain (guint32 gchandle, MonoDomain *domain)
2725 MonoDomain *gchandle_domain = (MonoDomain *)sgen_gchandle_get_metadata (gchandle);
2726 return domain->domain_id == gchandle_domain->domain_id;
2730 * mono_gchandle_free:
2731 * \param gchandle a GCHandle's handle.
2733 * Frees the \p gchandle handle. If there are no outstanding
2734 * references, the garbage collector can reclaim the memory of the
2738 mono_gchandle_free (guint32 gchandle)
2740 sgen_gchandle_free (gchandle);
2744 * mono_gchandle_free_domain:
2745 * \param unloading domain that is unloading
2747 * Function used internally to cleanup any GC handle for objects belonging
2748 * to the specified domain during appdomain unload.
2751 mono_gchandle_free_domain (MonoDomain *unloading)
2756 * mono_gchandle_get_target:
2757 * \param gchandle a GCHandle's handle.
2759 * The handle was previously created by calling \c mono_gchandle_new or
2760 * \c mono_gchandle_new_weakref.
2762 * \returns a pointer to the \c MonoObject* represented by the handle or
2763 * NULL for a collected object if using a weakref handle.
2766 mono_gchandle_get_target (guint32 gchandle)
2768 return sgen_gchandle_get_target (gchandle);
2772 null_link_if_in_domain (gpointer hidden, GCHandleType handle_type, int max_generation, gpointer user)
2774 MonoDomain *unloading_domain = (MonoDomain *)user;
2775 MonoDomain *obj_domain;
2776 gboolean is_weak = MONO_GC_HANDLE_TYPE_IS_WEAK (handle_type);
2777 if (MONO_GC_HANDLE_IS_OBJECT_POINTER (hidden)) {
2778 MonoObject *obj = (MonoObject *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2779 obj_domain = mono_object_domain (obj);
2781 obj_domain = (MonoDomain *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2783 if (unloading_domain->domain_id == obj_domain->domain_id)
2789 sgen_null_links_for_domain (MonoDomain *domain)
2792 for (type = HANDLE_TYPE_MIN; type < HANDLE_TYPE_MAX; ++type)
2793 sgen_gchandle_iterate ((GCHandleType)type, GENERATION_OLD, null_link_if_in_domain, domain);
2797 mono_gchandle_set_target (guint32 gchandle, MonoObject *obj)
2799 sgen_gchandle_set_target (gchandle, obj);
2803 sgen_client_gchandle_created (int handle_type, GCObject *obj, guint32 handle)
2805 #ifndef DISABLE_PERFCOUNTERS
2806 InterlockedIncrement (&mono_perfcounters->gc_num_handles);
2809 MONO_PROFILER_RAISE (gc_handle_created, (handle, handle_type, obj));
2813 sgen_client_gchandle_destroyed (int handle_type, guint32 handle)
2815 #ifndef DISABLE_PERFCOUNTERS
2816 InterlockedDecrement (&mono_perfcounters->gc_num_handles);
2819 MONO_PROFILER_RAISE (gc_handle_deleted, (handle, handle_type));
2823 sgen_client_ensure_weak_gchandles_accessible (void)
2826 * During the second bridge processing step the world is
2827 * running again. That step processes all weak links once
2828 * more to null those that refer to dead objects. Before that
2829 * is completed, those links must not be followed, so we
2830 * conservatively wait for bridge processing when any weak
2831 * link is dereferenced.
2833 /* FIXME: A GC can occur after this check fails, in which case we
2834 * should wait for bridge processing but would fail to do so.
2836 if (G_UNLIKELY (bridge_processing_in_progress))
2837 mono_gc_wait_for_bridge_processing ();
2841 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
2845 result = func (data);
2846 UNLOCK_INTERRUPTION;
2851 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
2857 mono_gc_get_card_table (int *shift_bits, gpointer *mask)
2859 return sgen_get_card_table_configuration (shift_bits, mask);
2863 mono_gc_card_table_nursery_check (void)
2865 return !sgen_get_major_collector ()->is_concurrent;
2868 /* Negative value to remove */
2870 mono_gc_add_memory_pressure (gint64 value)
2872 /* FIXME: Implement at some point? */
2880 sgen_client_degraded_allocation (void)
2882 static gint32 last_major_gc_warned = -1;
2883 static gint32 num_degraded = 0;
2885 gint32 major_gc_count = InterlockedRead (&gc_stats.major_gc_count);
2886 if (InterlockedRead (&last_major_gc_warned) < major_gc_count) {
2887 gint32 num = InterlockedIncrement (&num_degraded);
2888 if (num == 1 || num == 3)
2889 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Degraded allocation. Consider increasing nursery-size if the warning persists.");
2891 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Repeated degraded allocation. Consider increasing nursery-size.");
2892 InterlockedWrite (&last_major_gc_warned, major_gc_count);
2901 sgen_client_description_for_internal_mem_type (int type)
2904 case INTERNAL_MEM_EPHEMERON_LINK: return "ephemeron-link";
2905 case INTERNAL_MEM_MOVED_OBJECT: return "moved-object";
2912 sgen_client_pre_collection_checks (void)
2914 if (sgen_mono_xdomain_checks) {
2915 sgen_clear_nursery_fragments ();
2916 sgen_check_for_xdomain_refs ();
2921 sgen_client_vtable_is_inited (MonoVTable *vt)
2923 return vt->klass->inited;
2927 sgen_client_vtable_get_namespace (MonoVTable *vt)
2929 return vt->klass->name_space;
2933 sgen_client_vtable_get_name (MonoVTable *vt)
2935 return vt->klass->name;
2943 sgen_client_init (void)
2945 mono_thread_callbacks_init ();
2946 mono_thread_info_init (sizeof (SgenThreadInfo));
2948 ///* Keep this the default for now */
2949 /* Precise marking is broken on all supported targets. Disable until fixed. */
2950 conservative_stack_mark = TRUE;
2952 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_EPHEMERON_LINK, sizeof (EphemeronLinkNode));
2954 mono_sgen_init_stw ();
2956 mono_tls_init_gc_keys ();
2958 mono_thread_info_attach ();
2962 sgen_client_handle_gc_param (const char *opt)
2964 if (g_str_has_prefix (opt, "stack-mark=")) {
2965 opt = strchr (opt, '=') + 1;
2966 if (!strcmp (opt, "precise")) {
2967 conservative_stack_mark = FALSE;
2968 } else if (!strcmp (opt, "conservative")) {
2969 conservative_stack_mark = TRUE;
2971 sgen_env_var_error (MONO_GC_PARAMS_NAME, conservative_stack_mark ? "Using `conservative`." : "Using `precise`.",
2972 "Invalid value `%s` for `stack-mark` option, possible values are: `precise`, `conservative`.", opt);
2974 } else if (g_str_has_prefix (opt, "bridge-implementation=")) {
2975 opt = strchr (opt, '=') + 1;
2976 sgen_set_bridge_implementation (opt);
2977 } else if (g_str_has_prefix (opt, "toggleref-test")) {
2978 /* FIXME: This should probably in MONO_GC_DEBUG */
2979 sgen_register_test_toggleref_callback ();
2980 } else if (!sgen_bridge_handle_gc_param (opt)) {
2987 sgen_client_print_gc_params_usage (void)
2989 fprintf (stderr, " stack-mark=MARK-METHOD (where MARK-METHOD is 'precise' or 'conservative')\n");
2993 sgen_client_handle_gc_debug (const char *opt)
2995 if (!strcmp (opt, "xdomain-checks")) {
2996 sgen_mono_xdomain_checks = TRUE;
2997 } else if (!strcmp (opt, "do-not-finalize")) {
2998 mono_do_not_finalize = TRUE;
2999 } else if (g_str_has_prefix (opt, "do-not-finalize=")) {
3000 opt = strchr (opt, '=') + 1;
3001 mono_do_not_finalize = TRUE;
3002 mono_do_not_finalize_class_names = g_strsplit (opt, ",", 0);
3003 } else if (!strcmp (opt, "log-finalizers")) {
3004 log_finalizers = TRUE;
3005 } else if (!strcmp (opt, "no-managed-allocator")) {
3006 sgen_set_use_managed_allocator (FALSE);
3007 } else if (!sgen_bridge_handle_gc_debug (opt)) {
3014 sgen_client_print_gc_debug_usage (void)
3016 fprintf (stderr, " xdomain-checks\n");
3017 fprintf (stderr, " do-not-finalize\n");
3018 fprintf (stderr, " log-finalizers\n");
3019 fprintf (stderr, " no-managed-allocator\n");
3020 sgen_bridge_print_gc_debug_usage ();
3025 sgen_client_get_provenance (void)
3027 #ifdef SGEN_OBJECT_PROVENANCE
3028 MonoGCCallbacks *cb = mono_gc_get_gc_callbacks ();
3029 gpointer (*get_provenance_func) (void);
3032 get_provenance_func = cb->get_provenance_func;
3033 if (get_provenance_func)
3034 return get_provenance_func ();
3042 sgen_client_describe_invalid_pointer (GCObject *ptr)
3044 sgen_bridge_describe_pointer (ptr);
3047 static gboolean gc_inited;
3050 * mono_gc_base_init:
3053 mono_gc_base_init (void)
3058 mono_counters_init ();
3061 mono_w32handle_init ();
3064 #ifdef HEAVY_STATISTICS
3065 mono_counters_register ("los marked cards", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_marked_cards);
3066 mono_counters_register ("los array cards scanned ", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_cards);
3067 mono_counters_register ("los array remsets", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_remsets);
3069 mono_counters_register ("WBarrier set arrayref", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_set_arrayref);
3070 mono_counters_register ("WBarrier value copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_value_copy);
3071 mono_counters_register ("WBarrier object copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_object_copy);
3080 mono_gc_base_cleanup (void)
3082 sgen_thread_pool_shutdown ();
3084 // We should have consumed any outstanding moves.
3085 g_assert (sgen_pointer_queue_is_empty (&moved_objects_queue));
3089 mono_gc_is_null (void)