2 * sgen-mono.c: SGen features specific to Mono.
4 * Copyright (C) 2014 Xamarin Inc
6 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
12 #include "sgen/sgen-gc.h"
13 #include "sgen/sgen-protocol.h"
14 #include "metadata/monitor.h"
15 #include "sgen/sgen-layout-stats.h"
16 #include "sgen/sgen-client.h"
17 #include "sgen/sgen-cardtable.h"
18 #include "sgen/sgen-pinning.h"
19 #include "sgen/sgen-thread-pool.h"
20 #include "metadata/marshal.h"
21 #include "metadata/method-builder.h"
22 #include "metadata/abi-details.h"
23 #include "metadata/mono-gc.h"
24 #include "metadata/runtime.h"
25 #include "metadata/sgen-bridge-internals.h"
26 #include "metadata/gc-internals.h"
27 #include "metadata/handle.h"
28 #include "utils/mono-memory-model.h"
29 #include "utils/mono-logger-internals.h"
30 #include "utils/mono-threads-coop.h"
31 #include "sgen/sgen-thread-pool.h"
32 #include "utils/mono-threads.h"
34 #ifdef HEAVY_STATISTICS
35 static guint64 stat_wbarrier_set_arrayref = 0;
36 static guint64 stat_wbarrier_value_copy = 0;
37 static guint64 stat_wbarrier_object_copy = 0;
39 static guint64 los_marked_cards;
40 static guint64 los_array_cards;
41 static guint64 los_array_remsets;
44 /* If set, mark stacks conservatively, even if precise marking is possible */
45 static gboolean conservative_stack_mark = FALSE;
46 /* If set, check that there are no references to the domain left at domain unload */
47 gboolean sgen_mono_xdomain_checks = FALSE;
49 /* Functions supplied by the runtime to be called by the GC */
50 static MonoGCCallbacks gc_callbacks;
53 __thread SgenThreadInfo *sgen_thread_info;
55 MonoNativeTlsKey thread_info_key;
58 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
60 #define OPDEF(a,b,c,d,e,f,g,h,i,j) \
64 #include "mono/cil/opcode.def"
75 ptr_on_stack (void *ptr)
77 gpointer stack_start = &stack_start;
78 SgenThreadInfo *info = mono_thread_info_current ();
80 if (ptr >= stack_start && ptr < (gpointer)info->client_info.stack_end)
85 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
87 #define HANDLE_PTR(ptr,obj) do { \
88 gpointer o = *(gpointer*)(ptr); \
90 gpointer d = ((char*)dest) + ((char*)(ptr) - (char*)(obj)); \
91 binary_protocol_wbarrier (d, o, (gpointer) SGEN_LOAD_VTABLE (o)); \
96 scan_object_for_binary_protocol_copy_wbarrier (gpointer dest, char *start, mword desc)
98 #define SCAN_OBJECT_NOVTABLE
99 #include "sgen/sgen-scan-object.h"
104 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
106 HEAVY_STAT (++stat_wbarrier_value_copy);
107 g_assert (klass->valuetype);
109 SGEN_LOG (8, "Adding value remset at %p, count %d, descr %p for class %s (%p)", dest, count, (gpointer)klass->gc_descr, klass->name, klass);
111 if (sgen_ptr_in_nursery (dest) || ptr_on_stack (dest) || !sgen_gc_descr_has_references ((mword)klass->gc_descr)) {
112 size_t element_size = mono_class_value_size (klass, NULL);
113 size_t size = count * element_size;
114 mono_gc_memmove_atomic (dest, src, size);
118 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
119 if (binary_protocol_is_heavy_enabled ()) {
120 size_t element_size = mono_class_value_size (klass, NULL);
122 for (i = 0; i < count; ++i) {
123 scan_object_for_binary_protocol_copy_wbarrier ((char*)dest + i * element_size,
124 (char*)src + i * element_size - sizeof (MonoObject),
125 (mword) klass->gc_descr);
130 sgen_get_remset ()->wbarrier_value_copy (dest, src, count, mono_class_value_size (klass, NULL));
134 * mono_gc_wbarrier_object_copy:
136 * Write barrier to call when obj is the result of a clone or copy of an object.
139 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
143 HEAVY_STAT (++stat_wbarrier_object_copy);
145 SGEN_ASSERT (6, !ptr_on_stack (obj), "Why is this called for a non-reference type?");
146 if (sgen_ptr_in_nursery (obj) || !SGEN_OBJECT_HAS_REFERENCES (src)) {
147 size = mono_object_class (obj)->instance_size;
148 mono_gc_memmove_aligned ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
149 size - sizeof (MonoObject));
153 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
154 if (binary_protocol_is_heavy_enabled ())
155 scan_object_for_binary_protocol_copy_wbarrier (obj, (char*)src, (mword) src->vtable->gc_descr);
158 sgen_get_remset ()->wbarrier_object_copy (obj, src);
162 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
164 HEAVY_STAT (++stat_wbarrier_set_arrayref);
165 if (sgen_ptr_in_nursery (slot_ptr)) {
166 *(void**)slot_ptr = value;
169 SGEN_LOG (8, "Adding remset at %p", slot_ptr);
171 binary_protocol_wbarrier (slot_ptr, value, value->vtable);
173 sgen_get_remset ()->wbarrier_set_field ((GCObject*)arr, slot_ptr, value);
177 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
179 mono_gc_wbarrier_set_arrayref ((MonoArray*)obj, field_ptr, value);
183 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
185 sgen_wbarrier_value_copy_bitmap (_dest, _src, size, bitmap);
189 mono_gc_get_suspend_signal (void)
191 return mono_threads_suspend_get_suspend_signal ();
195 mono_gc_get_restart_signal (void)
197 return mono_threads_suspend_get_restart_signal ();
200 static MonoMethod *write_barrier_conc_method;
201 static MonoMethod *write_barrier_noconc_method;
204 sgen_is_critical_method (MonoMethod *method)
206 return sgen_is_managed_allocator (method);
210 sgen_has_critical_method (void)
212 return sgen_has_managed_allocator ();
218 emit_nursery_check (MonoMethodBuilder *mb, int *nursery_check_return_labels, gboolean is_concurrent)
220 int shifted_nursery_start = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
222 memset (nursery_check_return_labels, 0, sizeof (int) * 2);
223 // if (ptr_in_nursery (ptr)) return;
225 * Masking out the bits might be faster, but we would have to use 64 bit
226 * immediates, which might be slower.
228 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
229 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_START);
230 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
231 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
232 mono_mb_emit_byte (mb, CEE_SHR_UN);
233 mono_mb_emit_stloc (mb, shifted_nursery_start);
235 mono_mb_emit_ldarg (mb, 0);
236 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
237 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
238 mono_mb_emit_byte (mb, CEE_SHR_UN);
239 mono_mb_emit_ldloc (mb, shifted_nursery_start);
240 nursery_check_return_labels [0] = mono_mb_emit_branch (mb, CEE_BEQ);
242 if (!is_concurrent) {
243 // if (!ptr_in_nursery (*ptr)) return;
244 mono_mb_emit_ldarg (mb, 0);
245 mono_mb_emit_byte (mb, CEE_LDIND_I);
246 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
247 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
248 mono_mb_emit_byte (mb, CEE_SHR_UN);
249 mono_mb_emit_ldloc (mb, shifted_nursery_start);
250 nursery_check_return_labels [1] = mono_mb_emit_branch (mb, CEE_BNE_UN);
256 mono_gc_get_specific_write_barrier (gboolean is_concurrent)
259 MonoMethodBuilder *mb;
260 MonoMethodSignature *sig;
261 MonoMethod **write_barrier_method_addr;
263 #ifdef MANAGED_WBARRIER
264 int i, nursery_check_labels [2];
267 // FIXME: Maybe create a separate version for ctors (the branch would be
268 // correctly predicted more times)
270 write_barrier_method_addr = &write_barrier_conc_method;
272 write_barrier_method_addr = &write_barrier_noconc_method;
274 if (*write_barrier_method_addr)
275 return *write_barrier_method_addr;
277 /* Create the IL version of mono_gc_barrier_generic_store () */
278 sig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
279 sig->ret = &mono_defaults.void_class->byval_arg;
280 sig->params [0] = &mono_defaults.int_class->byval_arg;
283 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_conc", MONO_WRAPPER_WRITE_BARRIER);
285 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_noconc", MONO_WRAPPER_WRITE_BARRIER);
288 #ifdef MANAGED_WBARRIER
289 emit_nursery_check (mb, nursery_check_labels, is_concurrent);
291 addr = sgen_cardtable + ((address >> CARD_BITS) & CARD_MASK)
295 LDC_PTR sgen_cardtable
301 if (SGEN_HAVE_OVERLAPPING_CARDS) {
302 LDC_PTR card_table_mask
309 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
310 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_CARD_TABLE);
311 mono_mb_emit_ldarg (mb, 0);
312 mono_mb_emit_icon (mb, CARD_BITS);
313 mono_mb_emit_byte (mb, CEE_SHR_UN);
314 mono_mb_emit_byte (mb, CEE_CONV_I);
315 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
316 #if SIZEOF_VOID_P == 8
317 mono_mb_emit_icon8 (mb, CARD_MASK);
319 mono_mb_emit_icon (mb, CARD_MASK);
321 mono_mb_emit_byte (mb, CEE_CONV_I);
322 mono_mb_emit_byte (mb, CEE_AND);
324 mono_mb_emit_byte (mb, CEE_ADD);
325 mono_mb_emit_icon (mb, 1);
326 mono_mb_emit_byte (mb, CEE_STIND_I1);
329 for (i = 0; i < 2; ++i) {
330 if (nursery_check_labels [i])
331 mono_mb_patch_branch (mb, nursery_check_labels [i]);
333 mono_mb_emit_byte (mb, CEE_RET);
335 mono_mb_emit_ldarg (mb, 0);
336 mono_mb_emit_icall (mb, mono_gc_wbarrier_generic_nostore);
337 mono_mb_emit_byte (mb, CEE_RET);
340 res = mono_mb_create_method (mb, sig, 16);
341 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
342 mono_marshal_set_wrapper_info (res, info);
346 if (*write_barrier_method_addr) {
347 /* Already created */
348 mono_free_method (res);
350 /* double-checked locking */
351 mono_memory_barrier ();
352 *write_barrier_method_addr = res;
356 return *write_barrier_method_addr;
360 mono_gc_get_write_barrier (void)
362 return mono_gc_get_specific_write_barrier (major_collector.is_concurrent);
366 * Dummy filler objects
369 /* Vtable of the objects used to fill out nursery fragments before a collection */
370 static GCVTable array_fill_vtable;
373 get_array_fill_vtable (void)
375 if (!array_fill_vtable) {
376 static MonoClass klass;
377 static char _vtable[sizeof(MonoVTable)+8];
378 MonoVTable* vtable = (MonoVTable*) ALIGN_TO((mword)_vtable, 8);
381 MonoDomain *domain = mono_get_root_domain ();
384 klass.element_class = mono_defaults.byte_class;
386 klass.instance_size = MONO_SIZEOF_MONO_ARRAY;
387 klass.sizes.element_size = 1;
388 klass.name = "array_filler_type";
390 vtable->klass = &klass;
392 vtable->gc_descr = mono_gc_make_descr_for_array (TRUE, &bmap, 0, 1);
395 array_fill_vtable = vtable;
397 return array_fill_vtable;
401 sgen_client_array_fill_range (char *start, size_t size)
405 if (size < MONO_SIZEOF_MONO_ARRAY) {
406 memset (start, 0, size);
410 o = (MonoArray*)start;
411 o->obj.vtable = (MonoVTable*)get_array_fill_vtable ();
412 /* Mark this as not a real object */
413 o->obj.synchronisation = (MonoThreadsSync *)GINT_TO_POINTER (-1);
415 o->max_length = (mono_array_size_t)(size - MONO_SIZEOF_MONO_ARRAY);
421 sgen_client_zero_array_fill_header (void *p, size_t size)
423 if (size >= MONO_SIZEOF_MONO_ARRAY) {
424 memset (p, 0, MONO_SIZEOF_MONO_ARRAY);
426 static guint8 zeros [MONO_SIZEOF_MONO_ARRAY];
428 SGEN_ASSERT (0, !memcmp (p, zeros, size), "TLAB segment must be zeroed out.");
436 static MonoGCFinalizerCallbacks fin_callbacks;
439 mono_gc_get_vtable_bits (MonoClass *klass)
442 /* FIXME move this to the bridge code */
443 if (sgen_need_bridge_processing ()) {
444 switch (sgen_bridge_class_kind (klass)) {
445 case GC_BRIDGE_TRANSPARENT_BRIDGE_CLASS:
446 case GC_BRIDGE_OPAQUE_BRIDGE_CLASS:
447 res = SGEN_GC_BIT_BRIDGE_OBJECT;
449 case GC_BRIDGE_OPAQUE_CLASS:
450 res = SGEN_GC_BIT_BRIDGE_OPAQUE_OBJECT;
452 case GC_BRIDGE_TRANSPARENT_CLASS:
456 if (fin_callbacks.is_class_finalization_aware) {
457 if (fin_callbacks.is_class_finalization_aware (klass))
458 res |= SGEN_GC_BIT_FINALIZER_AWARE;
464 is_finalization_aware (MonoObject *obj)
466 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
467 return (vt->gc_bits & SGEN_GC_BIT_FINALIZER_AWARE) == SGEN_GC_BIT_FINALIZER_AWARE;
471 sgen_client_object_queued_for_finalization (GCObject *obj)
473 if (fin_callbacks.object_queued_for_finalization && is_finalization_aware (obj))
474 fin_callbacks.object_queued_for_finalization (obj);
477 if (G_UNLIKELY (MONO_GC_FINALIZE_ENQUEUE_ENABLED ())) {
478 int gen = sgen_ptr_in_nursery (obj) ? GENERATION_NURSERY : GENERATION_OLD;
479 GCVTable vt = SGEN_LOAD_VTABLE (obj);
480 MONO_GC_FINALIZE_ENQUEUE ((mword)obj, sgen_safe_object_get_size (obj),
481 sgen_client_vtable_get_namespace (vt), sgen_client_vtable_get_name (vt), gen,
482 sgen_client_object_has_critical_finalizer (obj));
488 mono_gc_register_finalizer_callbacks (MonoGCFinalizerCallbacks *callbacks)
490 if (callbacks->version != MONO_GC_FINALIZER_EXTENSION_VERSION)
491 g_error ("Invalid finalizer callback version. Expected %d but got %d\n", MONO_GC_FINALIZER_EXTENSION_VERSION, callbacks->version);
493 fin_callbacks = *callbacks;
497 sgen_client_run_finalize (MonoObject *obj)
499 mono_gc_run_finalize (obj, NULL);
503 mono_gc_invoke_finalizers (void)
505 return sgen_gc_invoke_finalizers ();
509 mono_gc_pending_finalizers (void)
511 return sgen_have_pending_finalizers ();
515 sgen_client_finalize_notify (void)
517 mono_gc_finalize_notify ();
521 mono_gc_register_for_finalization (MonoObject *obj, void *user_data)
523 sgen_object_register_for_finalization (obj, user_data);
527 object_in_domain_predicate (MonoObject *obj, void *user_data)
529 MonoDomain *domain = (MonoDomain *)user_data;
530 if (mono_object_domain (obj) == domain) {
531 SGEN_LOG (5, "Unregistering finalizer for object: %p (%s)", obj, sgen_client_vtable_get_name (SGEN_LOAD_VTABLE (obj)));
538 * mono_gc_finalizers_for_domain:
539 * @domain: the unloading appdomain
540 * @out_array: output array
541 * @out_size: size of output array
543 * Enqueue for finalization all objects that belong to the unloading appdomain @domain
544 * @suspend is used for early termination of the enqueuing process.
547 mono_gc_finalize_domain (MonoDomain *domain)
549 sgen_finalize_if (object_in_domain_predicate, domain);
553 mono_gc_suspend_finalizers (void)
555 sgen_set_suspend_finalizers ();
562 typedef struct _EphemeronLinkNode EphemeronLinkNode;
564 struct _EphemeronLinkNode {
565 EphemeronLinkNode *next;
574 static EphemeronLinkNode *ephemeron_list;
576 /* LOCKING: requires that the GC lock is held */
578 null_ephemerons_for_domain (MonoDomain *domain)
580 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
583 MonoObject *object = (MonoObject*)current->array;
586 SGEN_ASSERT (0, object->vtable, "Can't have objects without vtables.");
588 if (object && object->vtable->domain == domain) {
589 EphemeronLinkNode *tmp = current;
592 prev->next = current->next;
594 ephemeron_list = current->next;
596 current = current->next;
597 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
600 current = current->next;
605 /* LOCKING: requires that the GC lock is held */
607 sgen_client_clear_unreachable_ephemerons (ScanCopyContext ctx)
609 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
610 SgenGrayQueue *queue = ctx.queue;
611 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
612 Ephemeron *cur, *array_end;
616 MonoArray *array = current->array;
618 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
619 EphemeronLinkNode *tmp = current;
621 SGEN_LOG (5, "Dead Ephemeron array at %p", array);
624 prev->next = current->next;
626 ephemeron_list = current->next;
628 current = current->next;
629 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
634 copy_func ((GCObject**)&array, queue);
635 current->array = array;
637 SGEN_LOG (5, "Clearing unreachable entries for ephemeron array at %p", array);
639 cur = mono_array_addr (array, Ephemeron, 0);
640 array_end = cur + mono_array_length_fast (array);
641 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
643 for (; cur < array_end; ++cur) {
644 GCObject *key = cur->key;
646 if (!key || key == tombstone)
649 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
650 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
651 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
653 if (!sgen_is_object_alive_for_current_gen (key)) {
654 cur->key = tombstone;
660 current = current->next;
665 LOCKING: requires that the GC lock is held
667 Limitations: We scan all ephemerons on every collection since the current design doesn't allow for a simple nursery/mature split.
670 sgen_client_mark_ephemerons (ScanCopyContext ctx)
672 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
673 SgenGrayQueue *queue = ctx.queue;
674 gboolean nothing_marked = TRUE;
675 EphemeronLinkNode *current = ephemeron_list;
676 Ephemeron *cur, *array_end;
679 for (current = ephemeron_list; current; current = current->next) {
680 MonoArray *array = current->array;
681 SGEN_LOG (5, "Ephemeron array at %p", array);
683 /*It has to be alive*/
684 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
685 SGEN_LOG (5, "\tnot reachable");
689 copy_func ((GCObject**)&array, queue);
691 cur = mono_array_addr (array, Ephemeron, 0);
692 array_end = cur + mono_array_length_fast (array);
693 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
695 for (; cur < array_end; ++cur) {
696 GCObject *key = cur->key;
698 if (!key || key == tombstone)
701 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
702 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
703 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
705 if (sgen_is_object_alive_for_current_gen (key)) {
706 GCObject *value = cur->value;
708 copy_func (&cur->key, queue);
710 if (!sgen_is_object_alive_for_current_gen (value))
711 nothing_marked = FALSE;
712 copy_func (&cur->value, queue);
718 SGEN_LOG (5, "Ephemeron run finished. Is it done %d", nothing_marked);
719 return nothing_marked;
723 mono_gc_ephemeron_array_add (MonoObject *obj)
725 EphemeronLinkNode *node;
729 node = (EphemeronLinkNode *)sgen_alloc_internal (INTERNAL_MEM_EPHEMERON_LINK);
734 node->array = (MonoArray*)obj;
735 node->next = ephemeron_list;
736 ephemeron_list = node;
738 SGEN_LOG (5, "Registered ephemeron array %p", obj);
749 need_remove_object_for_domain (GCObject *start, MonoDomain *domain)
751 if (mono_object_domain (start) == domain) {
752 SGEN_LOG (4, "Need to cleanup object %p", start);
753 binary_protocol_cleanup (start, (gpointer)SGEN_LOAD_VTABLE (start), sgen_safe_object_get_size ((GCObject*)start));
760 process_object_for_domain_clearing (GCObject *start, MonoDomain *domain)
762 MonoVTable *vt = SGEN_LOAD_VTABLE (start);
763 if (vt->klass == mono_defaults.internal_thread_class)
764 g_assert (mono_object_domain (start) == mono_get_root_domain ());
765 /* The object could be a proxy for an object in the domain
767 #ifndef DISABLE_REMOTING
768 if (mono_defaults.real_proxy_class->supertypes && mono_class_has_parent_fast (vt->klass, mono_defaults.real_proxy_class)) {
769 MonoObject *server = ((MonoRealProxy*)start)->unwrapped_server;
771 /* The server could already have been zeroed out, so
772 we need to check for that, too. */
773 if (server && (!SGEN_LOAD_VTABLE (server) || mono_object_domain (server) == domain)) {
774 SGEN_LOG (4, "Cleaning up remote pointer in %p to object %p", start, server);
775 ((MonoRealProxy*)start)->unwrapped_server = NULL;
782 clear_domain_process_object (GCObject *obj, MonoDomain *domain)
786 process_object_for_domain_clearing (obj, domain);
787 remove = need_remove_object_for_domain (obj, domain);
789 if (remove && obj->synchronisation) {
790 guint32 dislink = mono_monitor_get_object_monitor_gchandle (obj);
792 mono_gchandle_free (dislink);
799 clear_domain_process_minor_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
801 if (clear_domain_process_object (obj, domain)) {
802 CANARIFY_SIZE (size);
803 memset (obj, 0, size);
808 clear_domain_process_major_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
810 clear_domain_process_object (obj, domain);
814 clear_domain_free_major_non_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
816 if (need_remove_object_for_domain (obj, domain))
817 major_collector.free_non_pinned_object (obj, size);
821 clear_domain_free_major_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
823 if (need_remove_object_for_domain (obj, domain))
824 major_collector.free_pinned_object (obj, size);
828 * When appdomains are unloaded we can easily remove objects that have finalizers,
829 * but all the others could still be present in random places on the heap.
830 * We need a sweep to get rid of them even though it's going to be costly
832 * The reason we need to remove them is because we access the vtable and class
833 * structures to know the object size and the reference bitmap: once the domain is
834 * unloaded the point to random memory.
837 mono_gc_clear_domain (MonoDomain * domain)
839 LOSObject *bigobj, *prev;
844 binary_protocol_domain_unload_begin (domain);
848 if (sgen_concurrent_collection_in_progress ())
849 sgen_perform_collection (0, GENERATION_OLD, "clear domain", TRUE, FALSE);
850 SGEN_ASSERT (0, !sgen_concurrent_collection_in_progress (), "We just ordered a synchronous collection. Why are we collecting concurrently?");
852 major_collector.finish_sweeping ();
854 sgen_process_fin_stage_entries ();
856 sgen_clear_nursery_fragments ();
858 if (sgen_mono_xdomain_checks && domain != mono_get_root_domain ()) {
859 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_NORMAL);
860 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_WBARRIER);
861 sgen_check_for_xdomain_refs ();
864 /*Ephemerons and dislinks must be processed before LOS since they might end up pointing
865 to memory returned to the OS.*/
866 null_ephemerons_for_domain (domain);
867 sgen_null_links_for_domain (domain);
869 for (i = GENERATION_NURSERY; i < GENERATION_MAX; ++i)
870 sgen_remove_finalizers_if (object_in_domain_predicate, domain, i);
872 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
873 (IterateObjectCallbackFunc)clear_domain_process_minor_object_callback, domain, FALSE, TRUE);
875 /* We need two passes over major and large objects because
876 freeing such objects might give their memory back to the OS
877 (in the case of large objects) or obliterate its vtable
878 (pinned objects with major-copying or pinned and non-pinned
879 objects with major-mark&sweep), but we might need to
880 dereference a pointer from an object to another object if
881 the first object is a proxy. */
882 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, (IterateObjectCallbackFunc)clear_domain_process_major_object_callback, domain);
883 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
884 clear_domain_process_object ((GCObject*)bigobj->data, domain);
887 for (bigobj = los_object_list; bigobj;) {
888 if (need_remove_object_for_domain ((GCObject*)bigobj->data, domain)) {
889 LOSObject *to_free = bigobj;
891 prev->next = bigobj->next;
893 los_object_list = bigobj->next;
894 bigobj = bigobj->next;
895 SGEN_LOG (4, "Freeing large object %p", bigobj->data);
896 sgen_los_free_object (to_free);
900 bigobj = bigobj->next;
902 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_NON_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_non_pinned_object_callback, domain);
903 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_pinned_object_callback, domain);
905 if (domain == mono_get_root_domain ()) {
906 sgen_pin_stats_report ();
907 sgen_object_layout_dump (stdout);
910 sgen_restart_world (0);
912 binary_protocol_domain_unload_end (domain);
913 binary_protocol_flush_buffers (FALSE);
923 mono_gc_alloc_obj (MonoVTable *vtable, size_t size)
925 MonoObject *obj = sgen_alloc_obj (vtable, size);
927 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
929 mono_profiler_allocation (obj);
936 mono_gc_alloc_pinned_obj (MonoVTable *vtable, size_t size)
938 MonoObject *obj = sgen_alloc_obj_pinned (vtable, size);
940 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
942 mono_profiler_allocation (obj);
949 mono_gc_alloc_mature (MonoVTable *vtable, size_t size)
951 MonoObject *obj = sgen_alloc_obj_mature (vtable, size);
953 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS)) {
955 mono_profiler_allocation (obj);
962 mono_gc_alloc_fixed (size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
964 /* FIXME: do a single allocation */
965 void *res = g_calloc (1, size);
968 if (!mono_gc_register_root ((char *)res, size, descr, source, msg)) {
976 mono_gc_free_fixed (void* addr)
978 mono_gc_deregister_root ((char *)addr);
986 static MonoMethod* alloc_method_cache [ATYPE_NUM];
987 static MonoMethod* slowpath_alloc_method_cache [ATYPE_NUM];
988 static gboolean use_managed_allocator = TRUE;
990 #ifdef MANAGED_ALLOCATION
992 #if defined(HAVE_KW_THREAD) || defined(TARGET_OSX) || defined(TARGET_WIN32) || defined(TARGET_ANDROID) || defined(TARGET_IOS)
994 // Cache the SgenThreadInfo pointer in a local 'var'.
995 #define EMIT_TLS_ACCESS_VAR(mb, var) \
997 var = mono_mb_add_local ((mb), &mono_defaults.int_class->byval_arg); \
998 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
999 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1000 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1001 mono_mb_emit_stloc ((mb), (var)); \
1004 #define EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR(mb, var) \
1006 mono_mb_emit_ldloc ((mb), (var)); \
1007 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenClientThreadInfo, in_critical_region)); \
1008 mono_mb_emit_byte ((mb), CEE_ADD); \
1011 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb, var) do { \
1012 mono_mb_emit_ldloc ((mb), (var)); \
1013 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_next)); \
1014 mono_mb_emit_byte ((mb), CEE_ADD); \
1017 #define EMIT_TLS_ACCESS_TEMP_END(mb, var) do { \
1018 mono_mb_emit_ldloc ((mb), (var)); \
1019 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_temp_end)); \
1020 mono_mb_emit_byte ((mb), CEE_ADD); \
1021 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1025 #define EMIT_TLS_ACCESS_VAR(mb, _var) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1026 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb, _var) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1027 #define EMIT_TLS_ACCESS_TEMP_END(mb, _var) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1028 #define EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR(mb, _var) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1032 /* FIXME: Do this in the JIT, where specialized allocation sequences can be created
1033 * for each class. This is currently not easy to do, as it is hard to generate basic
1034 * blocks + branches, but it is easy with the linear IL codebase.
1036 * For this to work we'd need to solve the TLAB race, first. Now we
1037 * require the allocator to be in a few known methods to make sure
1038 * that they are executed atomically via the restart mechanism.
1041 create_allocator (int atype, ManagedAllocatorVariant variant)
1043 int p_var, size_var, thread_var G_GNUC_UNUSED;
1044 gboolean slowpath = variant == MANAGED_ALLOCATOR_SLOW_PATH;
1045 guint32 slowpath_branch, max_size_branch;
1046 MonoMethodBuilder *mb;
1048 MonoMethodSignature *csig;
1049 static gboolean registered = FALSE;
1050 int tlab_next_addr_var, new_next_var;
1051 const char *name = NULL;
1056 mono_register_jit_icall (mono_gc_alloc_obj, "mono_gc_alloc_obj", mono_create_icall_signature ("object ptr int"), FALSE);
1057 mono_register_jit_icall (mono_gc_alloc_vector, "mono_gc_alloc_vector", mono_create_icall_signature ("object ptr int int"), FALSE);
1058 mono_register_jit_icall (mono_gc_alloc_string, "mono_gc_alloc_string", mono_create_icall_signature ("object ptr int int32"), FALSE);
1062 if (atype == ATYPE_SMALL) {
1063 name = slowpath ? "SlowAllocSmall" : "AllocSmall";
1064 } else if (atype == ATYPE_NORMAL) {
1065 name = slowpath ? "SlowAlloc" : "Alloc";
1066 } else if (atype == ATYPE_VECTOR) {
1067 name = slowpath ? "SlowAllocVector" : "AllocVector";
1068 } else if (atype == ATYPE_STRING) {
1069 name = slowpath ? "SlowAllocString" : "AllocString";
1071 g_assert_not_reached ();
1074 if (atype == ATYPE_NORMAL)
1079 csig = mono_metadata_signature_alloc (mono_defaults.corlib, num_params);
1080 if (atype == ATYPE_STRING) {
1081 csig->ret = &mono_defaults.string_class->byval_arg;
1082 csig->params [0] = &mono_defaults.int_class->byval_arg;
1083 csig->params [1] = &mono_defaults.int32_class->byval_arg;
1085 csig->ret = &mono_defaults.object_class->byval_arg;
1086 for (i = 0; i < num_params; i++)
1087 csig->params [i] = &mono_defaults.int_class->byval_arg;
1090 mb = mono_mb_new (mono_defaults.object_class, name, MONO_WRAPPER_ALLOC);
1097 mono_mb_emit_ldarg (mb, 0);
1098 mono_mb_emit_icall (mb, ves_icall_object_new_specific);
1101 mono_mb_emit_ldarg (mb, 0);
1102 mono_mb_emit_ldarg (mb, 1);
1103 mono_mb_emit_icall (mb, ves_icall_array_new_specific);
1106 mono_mb_emit_ldarg (mb, 1);
1107 mono_mb_emit_icall (mb, ves_icall_string_alloc);
1110 g_assert_not_reached ();
1117 * Tls access might call foreign code or code without jinfo. This can
1118 * only happen if we are outside of the critical region.
1120 EMIT_TLS_ACCESS_VAR (mb, thread_var);
1122 size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1123 if (atype == ATYPE_SMALL) {
1124 /* size_var = size_arg */
1125 mono_mb_emit_ldarg (mb, 1);
1126 mono_mb_emit_stloc (mb, size_var);
1127 } else if (atype == ATYPE_NORMAL) {
1128 /* size = vtable->klass->instance_size; */
1129 mono_mb_emit_ldarg (mb, 0);
1130 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1131 mono_mb_emit_byte (mb, CEE_ADD);
1132 mono_mb_emit_byte (mb, CEE_LDIND_I);
1133 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, instance_size));
1134 mono_mb_emit_byte (mb, CEE_ADD);
1135 /* FIXME: assert instance_size stays a 4 byte integer */
1136 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1137 mono_mb_emit_byte (mb, CEE_CONV_I);
1138 mono_mb_emit_stloc (mb, size_var);
1139 } else if (atype == ATYPE_VECTOR) {
1140 MonoExceptionClause *clause;
1141 int pos, pos_leave, pos_error;
1142 MonoClass *oom_exc_class;
1146 * n > MONO_ARRAY_MAX_INDEX => OutOfMemoryException
1147 * n < 0 => OverflowException
1149 * We can do an unsigned comparison to catch both cases, then in the error
1150 * case compare signed to distinguish between them.
1152 mono_mb_emit_ldarg (mb, 1);
1153 mono_mb_emit_icon (mb, MONO_ARRAY_MAX_INDEX);
1154 mono_mb_emit_byte (mb, CEE_CONV_U);
1155 pos = mono_mb_emit_short_branch (mb, CEE_BLE_UN_S);
1157 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1158 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1159 mono_mb_emit_ldarg (mb, 1);
1160 mono_mb_emit_icon (mb, 0);
1161 pos_error = mono_mb_emit_short_branch (mb, CEE_BLT_S);
1162 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1163 mono_mb_patch_short_branch (mb, pos_error);
1164 mono_mb_emit_exception (mb, "OverflowException", NULL);
1166 mono_mb_patch_short_branch (mb, pos);
1168 clause = (MonoExceptionClause *)mono_image_alloc0 (mono_defaults.corlib, sizeof (MonoExceptionClause));
1169 clause->try_offset = mono_mb_get_label (mb);
1171 /* vtable->klass->sizes.element_size */
1172 mono_mb_emit_ldarg (mb, 0);
1173 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1174 mono_mb_emit_byte (mb, CEE_ADD);
1175 mono_mb_emit_byte (mb, CEE_LDIND_I);
1176 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, sizes));
1177 mono_mb_emit_byte (mb, CEE_ADD);
1178 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1179 mono_mb_emit_byte (mb, CEE_CONV_I);
1182 mono_mb_emit_ldarg (mb, 1);
1183 mono_mb_emit_byte (mb, CEE_MUL_OVF_UN);
1184 /* + sizeof (MonoArray) */
1185 mono_mb_emit_icon (mb, MONO_SIZEOF_MONO_ARRAY);
1186 mono_mb_emit_byte (mb, CEE_ADD_OVF_UN);
1187 mono_mb_emit_stloc (mb, size_var);
1189 pos_leave = mono_mb_emit_branch (mb, CEE_LEAVE);
1192 clause->flags = MONO_EXCEPTION_CLAUSE_NONE;
1193 clause->try_len = mono_mb_get_pos (mb) - clause->try_offset;
1194 clause->data.catch_class = mono_class_load_from_name (mono_defaults.corlib,
1195 "System", "OverflowException");
1196 clause->handler_offset = mono_mb_get_label (mb);
1198 oom_exc_class = mono_class_load_from_name (mono_defaults.corlib,
1199 "System", "OutOfMemoryException");
1200 ctor = mono_class_get_method_from_name (oom_exc_class, ".ctor", 0);
1203 mono_mb_emit_byte (mb, CEE_POP);
1204 mono_mb_emit_op (mb, CEE_NEWOBJ, ctor);
1205 mono_mb_emit_byte (mb, CEE_THROW);
1207 clause->handler_len = mono_mb_get_pos (mb) - clause->handler_offset;
1208 mono_mb_set_clauses (mb, 1, clause);
1209 mono_mb_patch_branch (mb, pos_leave);
1211 } else if (atype == ATYPE_STRING) {
1215 * a string allocator method takes the args: (vtable, len)
1217 * bytes = offsetof (MonoString, chars) + ((len + 1) * 2)
1221 * bytes <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1225 * offsetof (MonoString, chars) + ((len + 1) * 2) <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1226 * len <= (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - offsetof (MonoString, chars)) / 2 - 1
1228 mono_mb_emit_ldarg (mb, 1);
1229 mono_mb_emit_icon (mb, (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - MONO_STRUCT_OFFSET (MonoString, chars)) / 2 - 1);
1230 pos = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
1232 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1233 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1234 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1235 mono_mb_patch_short_branch (mb, pos);
1237 mono_mb_emit_ldarg (mb, 1);
1238 mono_mb_emit_icon (mb, 1);
1239 mono_mb_emit_byte (mb, MONO_CEE_SHL);
1240 //WE manually fold the above + 2 here
1241 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, chars) + 2);
1242 mono_mb_emit_byte (mb, CEE_ADD);
1243 mono_mb_emit_stloc (mb, size_var);
1245 g_assert_not_reached ();
1248 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1249 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1250 mono_mb_emit_byte (mb, CEE_LDC_I4_1);
1251 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1252 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1253 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_NONE);
1256 /* size += ALLOC_ALIGN - 1; */
1257 mono_mb_emit_ldloc (mb, size_var);
1258 mono_mb_emit_icon (mb, SGEN_ALLOC_ALIGN - 1);
1259 mono_mb_emit_byte (mb, CEE_ADD);
1260 /* size &= ~(ALLOC_ALIGN - 1); */
1261 mono_mb_emit_icon (mb, ~(SGEN_ALLOC_ALIGN - 1));
1262 mono_mb_emit_byte (mb, CEE_AND);
1263 mono_mb_emit_stloc (mb, size_var);
1265 /* if (size > MAX_SMALL_OBJ_SIZE) goto slowpath */
1266 if (atype != ATYPE_SMALL) {
1267 mono_mb_emit_ldloc (mb, size_var);
1268 mono_mb_emit_icon (mb, SGEN_MAX_SMALL_OBJ_SIZE);
1269 max_size_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
1273 * We need to modify tlab_next, but the JIT only supports reading, so we read
1274 * another tls var holding its address instead.
1277 /* tlab_next_addr (local) = tlab_next_addr (TLS var) */
1278 tlab_next_addr_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1279 EMIT_TLS_ACCESS_NEXT_ADDR (mb, thread_var);
1280 mono_mb_emit_stloc (mb, tlab_next_addr_var);
1282 /* p = (void**)tlab_next; */
1283 p_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1284 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1285 mono_mb_emit_byte (mb, CEE_LDIND_I);
1286 mono_mb_emit_stloc (mb, p_var);
1288 /* new_next = (char*)p + size; */
1289 new_next_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1290 mono_mb_emit_ldloc (mb, p_var);
1291 mono_mb_emit_ldloc (mb, size_var);
1292 mono_mb_emit_byte (mb, CEE_CONV_I);
1293 mono_mb_emit_byte (mb, CEE_ADD);
1294 mono_mb_emit_stloc (mb, new_next_var);
1296 /* if (G_LIKELY (new_next < tlab_temp_end)) */
1297 mono_mb_emit_ldloc (mb, new_next_var);
1298 EMIT_TLS_ACCESS_TEMP_END (mb, thread_var);
1299 slowpath_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
1302 if (atype != ATYPE_SMALL)
1303 mono_mb_patch_short_branch (mb, max_size_branch);
1305 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1306 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1308 * We are no longer in a critical section. We need to do this before calling
1309 * to unmanaged land in order to avoid stw deadlocks since unmanaged code
1312 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1313 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1314 mono_mb_emit_byte (mb, CEE_LDC_I4_0);
1315 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1316 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1317 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_NONE);
1320 /* FIXME: mono_gc_alloc_obj takes a 'size_t' as an argument, not an int32 */
1321 mono_mb_emit_ldarg (mb, 0);
1322 mono_mb_emit_ldloc (mb, size_var);
1323 if (atype == ATYPE_NORMAL || atype == ATYPE_SMALL) {
1324 mono_mb_emit_icall (mb, mono_gc_alloc_obj);
1325 } else if (atype == ATYPE_VECTOR) {
1326 mono_mb_emit_ldarg (mb, 1);
1327 mono_mb_emit_icall (mb, mono_gc_alloc_vector);
1328 } else if (atype == ATYPE_STRING) {
1329 mono_mb_emit_ldarg (mb, 1);
1330 mono_mb_emit_icall (mb, mono_gc_alloc_string);
1332 g_assert_not_reached ();
1334 mono_mb_emit_byte (mb, CEE_RET);
1337 mono_mb_patch_short_branch (mb, slowpath_branch);
1339 /* FIXME: Memory barrier */
1341 /* tlab_next = new_next */
1342 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1343 mono_mb_emit_ldloc (mb, new_next_var);
1344 mono_mb_emit_byte (mb, CEE_STIND_I);
1347 mono_mb_emit_ldloc (mb, p_var);
1348 mono_mb_emit_ldarg (mb, 0);
1349 mono_mb_emit_byte (mb, CEE_STIND_I);
1351 if (atype == ATYPE_VECTOR) {
1352 /* arr->max_length = max_length; */
1353 mono_mb_emit_ldloc (mb, p_var);
1354 mono_mb_emit_ldflda (mb, MONO_STRUCT_OFFSET (MonoArray, max_length));
1355 mono_mb_emit_ldarg (mb, 1);
1356 #ifdef MONO_BIG_ARRAYS
1357 mono_mb_emit_byte (mb, CEE_STIND_I);
1359 mono_mb_emit_byte (mb, CEE_STIND_I4);
1361 } else if (atype == ATYPE_STRING) {
1362 /* need to set length and clear the last char */
1363 /* s->length = len; */
1364 mono_mb_emit_ldloc (mb, p_var);
1365 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, length));
1366 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1367 mono_mb_emit_ldarg (mb, 1);
1368 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
1371 #ifdef MANAGED_ALLOCATOR_CAN_USE_CRITICAL_REGION
1372 EMIT_TLS_ACCESS_IN_CRITICAL_REGION_ADDR (mb, thread_var);
1373 mono_mb_emit_byte (mb, CEE_LDC_I4_0);
1374 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1375 mono_mb_emit_byte (mb, CEE_MONO_ATOMIC_STORE_I4);
1377 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1378 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1381 We must make sure both vtable and max_length are globaly visible before returning to managed land.
1383 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1386 mono_mb_emit_ldloc (mb, p_var);
1389 mono_mb_emit_byte (mb, CEE_RET);
1392 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
1393 info->d.alloc.gc_name = "sgen";
1394 info->d.alloc.alloc_type = atype;
1397 mb->init_locals = FALSE;
1400 res = mono_mb_create (mb, csig, 8, info);
1409 mono_gc_get_aligned_size_for_allocator (int size)
1411 return SGEN_ALIGN_UP (size);
1415 * Generate an allocator method implementing the fast path of mono_gc_alloc_obj ().
1416 * The signature of the called method is:
1417 * object allocate (MonoVTable *vtable)
1420 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box, gboolean known_instance_size)
1422 #ifdef MANAGED_ALLOCATION
1423 if (collect_before_allocs)
1425 if (!mono_runtime_has_tls_get ())
1427 if (klass->instance_size > tlab_size)
1429 if (known_instance_size && ALIGN_TO (klass->instance_size, SGEN_ALLOC_ALIGN) >= SGEN_MAX_SMALL_OBJ_SIZE)
1431 if (mono_class_has_finalizer (klass) || mono_class_is_marshalbyref (klass))
1435 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1437 if (klass->byval_arg.type == MONO_TYPE_STRING)
1438 return mono_gc_get_managed_allocator_by_type (ATYPE_STRING, MANAGED_ALLOCATOR_REGULAR);
1439 /* Generic classes have dynamic field and can go above MAX_SMALL_OBJ_SIZE. */
1440 if (known_instance_size)
1441 return mono_gc_get_managed_allocator_by_type (ATYPE_SMALL, MANAGED_ALLOCATOR_REGULAR);
1443 return mono_gc_get_managed_allocator_by_type (ATYPE_NORMAL, MANAGED_ALLOCATOR_REGULAR);
1450 mono_gc_get_managed_array_allocator (MonoClass *klass)
1452 #ifdef MANAGED_ALLOCATION
1453 if (klass->rank != 1)
1455 if (!mono_runtime_has_tls_get ())
1457 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1459 if (has_per_allocation_action)
1461 g_assert (!mono_class_has_finalizer (klass) && !mono_class_is_marshalbyref (klass));
1463 return mono_gc_get_managed_allocator_by_type (ATYPE_VECTOR, MANAGED_ALLOCATOR_REGULAR);
1470 sgen_set_use_managed_allocator (gboolean flag)
1472 use_managed_allocator = flag;
1476 mono_gc_get_managed_allocator_by_type (int atype, ManagedAllocatorVariant variant)
1478 #ifdef MANAGED_ALLOCATION
1482 if (variant == MANAGED_ALLOCATOR_REGULAR && !use_managed_allocator)
1485 if (variant == MANAGED_ALLOCATOR_REGULAR && !mono_runtime_has_tls_get ())
1489 case MANAGED_ALLOCATOR_REGULAR: cache = alloc_method_cache; break;
1490 case MANAGED_ALLOCATOR_SLOW_PATH: cache = slowpath_alloc_method_cache; break;
1491 default: g_assert_not_reached (); break;
1494 res = cache [atype];
1498 res = create_allocator (atype, variant);
1500 if (cache [atype]) {
1501 mono_free_method (res);
1502 res = cache [atype];
1504 mono_memory_barrier ();
1505 cache [atype] = res;
1516 mono_gc_get_managed_allocator_types (void)
1522 sgen_is_managed_allocator (MonoMethod *method)
1526 for (i = 0; i < ATYPE_NUM; ++i)
1527 if (method == alloc_method_cache [i] || method == slowpath_alloc_method_cache [i])
1533 sgen_has_managed_allocator (void)
1537 for (i = 0; i < ATYPE_NUM; ++i)
1538 if (alloc_method_cache [i] || slowpath_alloc_method_cache [i])
1544 * Cardtable scanning
1547 #define MWORD_MASK (sizeof (mword) - 1)
1550 find_card_offset (mword card)
1552 /*XXX Use assembly as this generates some pretty bad code */
1553 #if defined(__i386__) && defined(__GNUC__)
1554 return (__builtin_ffs (card) - 1) / 8;
1555 #elif defined(__x86_64__) && defined(__GNUC__)
1556 return (__builtin_ffsll (card) - 1) / 8;
1557 #elif defined(__s390x__)
1558 return (__builtin_ffsll (GUINT64_TO_LE(card)) - 1) / 8;
1561 guint8 *ptr = (guint8 *) &card;
1562 for (i = 0; i < sizeof (mword); ++i) {
1571 find_next_card (guint8 *card_data, guint8 *end)
1573 mword *cards, *cards_end;
1576 while ((((mword)card_data) & MWORD_MASK) && card_data < end) {
1582 if (card_data == end)
1585 cards = (mword*)card_data;
1586 cards_end = (mword*)((mword)end & ~MWORD_MASK);
1587 while (cards < cards_end) {
1590 return (guint8*)cards + find_card_offset (card);
1594 card_data = (guint8*)cards_end;
1595 while (card_data < end) {
1604 #define ARRAY_OBJ_INDEX(ptr,array,elem_size) (((char*)(ptr) - ((char*)(array) + G_STRUCT_OFFSET (MonoArray, vector))) / (elem_size))
1607 sgen_client_cardtable_scan_object (GCObject *obj, mword block_obj_size, guint8 *cards, ScanCopyContext ctx)
1609 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
1610 MonoClass *klass = vt->klass;
1612 SGEN_ASSERT (0, SGEN_VTABLE_HAS_REFERENCES (vt), "Why would we ever call this on reference-free objects?");
1615 MonoArray *arr = (MonoArray*)obj;
1616 guint8 *card_data, *card_base;
1617 guint8 *card_data_end;
1618 char *obj_start = (char *)sgen_card_table_align_pointer (obj);
1620 mword obj_size = sgen_mono_array_size (vt, arr, &bounds_size, sgen_vtable_get_descriptor (vt));
1621 /* We don't want to scan the bounds entries at the end of multidimensional arrays */
1622 char *obj_end = (char*)obj + obj_size - bounds_size;
1624 size_t extra_idx = 0;
1626 mword desc = (mword)klass->element_class->gc_descr;
1627 int elem_size = mono_array_element_size (klass);
1629 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1630 guint8 *overflow_scan_end = NULL;
1633 #ifdef SGEN_OBJECT_LAYOUT_STATISTICS
1634 if (klass->element_class->valuetype)
1635 sgen_object_layout_scanned_vtype_array ();
1637 sgen_object_layout_scanned_ref_array ();
1643 card_data = sgen_card_table_get_card_scan_address ((mword)obj);
1645 card_base = card_data;
1646 card_count = sgen_card_table_number_of_cards_in_range ((mword)obj, obj_size);
1647 card_data_end = card_data + card_count;
1650 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1651 /*Check for overflow and if so, setup to scan in two steps*/
1652 if (!cards && card_data_end >= SGEN_SHADOW_CARDTABLE_END) {
1653 overflow_scan_end = sgen_shadow_cardtable + (card_data_end - SGEN_SHADOW_CARDTABLE_END);
1654 card_data_end = SGEN_SHADOW_CARDTABLE_END;
1660 card_data = find_next_card (card_data, card_data_end);
1661 for (; card_data < card_data_end; card_data = find_next_card (card_data + 1, card_data_end)) {
1663 size_t idx = (card_data - card_base) + extra_idx;
1664 char *start = (char*)(obj_start + idx * CARD_SIZE_IN_BYTES);
1665 char *card_end = start + CARD_SIZE_IN_BYTES;
1666 char *first_elem, *elem;
1668 HEAVY_STAT (++los_marked_cards);
1671 sgen_card_table_prepare_card_for_scanning (card_data);
1673 card_end = MIN (card_end, obj_end);
1675 if (start <= (char*)arr->vector)
1678 index = ARRAY_OBJ_INDEX (start, obj, elem_size);
1680 elem = first_elem = (char*)mono_array_addr_with_size_fast ((MonoArray*)obj, elem_size, index);
1681 if (klass->element_class->valuetype) {
1682 ScanVTypeFunc scan_vtype_func = ctx.ops->scan_vtype;
1684 for (; elem < card_end; elem += elem_size)
1685 scan_vtype_func (obj, elem, desc, ctx.queue BINARY_PROTOCOL_ARG (elem_size));
1687 ScanPtrFieldFunc scan_ptr_field_func = ctx.ops->scan_ptr_field;
1689 HEAVY_STAT (++los_array_cards);
1690 for (; elem < card_end; elem += SIZEOF_VOID_P)
1691 scan_ptr_field_func (obj, (GCObject**)elem, ctx.queue);
1694 binary_protocol_card_scan (first_elem, elem - first_elem);
1697 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1698 if (overflow_scan_end) {
1699 extra_idx = card_data - card_base;
1700 card_base = card_data = sgen_shadow_cardtable;
1701 card_data_end = overflow_scan_end;
1702 overflow_scan_end = NULL;
1713 * Array and string allocation
1717 mono_gc_alloc_vector (MonoVTable *vtable, size_t size, uintptr_t max_length)
1722 if (!SGEN_CAN_ALIGN_UP (size))
1725 #ifndef DISABLE_CRITICAL_REGION
1726 ENTER_CRITICAL_REGION;
1727 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1729 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1730 arr->max_length = (mono_array_size_t)max_length;
1731 EXIT_CRITICAL_REGION;
1734 EXIT_CRITICAL_REGION;
1739 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1740 if (G_UNLIKELY (!arr)) {
1745 arr->max_length = (mono_array_size_t)max_length;
1750 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1751 mono_profiler_allocation (&arr->obj);
1753 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Vector has incorrect size.");
1758 mono_gc_alloc_array (MonoVTable *vtable, size_t size, uintptr_t max_length, uintptr_t bounds_size)
1761 MonoArrayBounds *bounds;
1764 if (!SGEN_CAN_ALIGN_UP (size))
1767 #ifndef DISABLE_CRITICAL_REGION
1768 ENTER_CRITICAL_REGION;
1769 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1771 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1772 arr->max_length = (mono_array_size_t)max_length;
1774 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1775 arr->bounds = bounds;
1776 EXIT_CRITICAL_REGION;
1779 EXIT_CRITICAL_REGION;
1784 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1785 if (G_UNLIKELY (!arr)) {
1790 arr->max_length = (mono_array_size_t)max_length;
1792 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1793 arr->bounds = bounds;
1798 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1799 mono_profiler_allocation (&arr->obj);
1801 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Array has incorrect size.");
1806 mono_gc_alloc_string (MonoVTable *vtable, size_t size, gint32 len)
1811 if (!SGEN_CAN_ALIGN_UP (size))
1814 #ifndef DISABLE_CRITICAL_REGION
1815 ENTER_CRITICAL_REGION;
1816 str = (MonoString*)sgen_try_alloc_obj_nolock (vtable, size);
1818 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1820 EXIT_CRITICAL_REGION;
1823 EXIT_CRITICAL_REGION;
1828 str = (MonoString*)sgen_alloc_obj_nolock (vtable, size);
1829 if (G_UNLIKELY (!str)) {
1839 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_ALLOCATIONS))
1840 mono_profiler_allocation (&str->object);
1850 mono_gc_set_string_length (MonoString *str, gint32 new_length)
1852 mono_unichar2 *new_end = str->chars + new_length;
1854 /* zero the discarded string. This null-delimits the string and allows
1855 * the space to be reclaimed by SGen. */
1857 if (nursery_canaries_enabled () && sgen_ptr_in_nursery (str)) {
1858 CHECK_CANARY_FOR_OBJECT ((GCObject*)str, TRUE);
1859 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2) + CANARY_SIZE);
1860 memcpy (new_end + 1 , CANARY_STRING, CANARY_SIZE);
1862 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2));
1865 str->length = new_length;
1872 #define GC_ROOT_NUM 32
1874 int count; /* must be the first field */
1875 void *objects [GC_ROOT_NUM];
1876 int root_types [GC_ROOT_NUM];
1877 uintptr_t extra_info [GC_ROOT_NUM];
1881 notify_gc_roots (GCRootReport *report)
1885 mono_profiler_gc_roots (report->count, report->objects, report->root_types, report->extra_info);
1890 add_profile_gc_root (GCRootReport *report, void *object, int rtype, uintptr_t extra_info)
1892 if (report->count == GC_ROOT_NUM)
1893 notify_gc_roots (report);
1894 report->objects [report->count] = object;
1895 report->root_types [report->count] = rtype;
1896 report->extra_info [report->count++] = (uintptr_t)SGEN_LOAD_VTABLE (object)->klass;
1900 sgen_client_nursery_objects_pinned (void **definitely_pinned, int count)
1902 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS) {
1903 GCRootReport report;
1906 for (idx = 0; idx < count; ++idx)
1907 add_profile_gc_root (&report, definitely_pinned [idx], MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
1908 notify_gc_roots (&report);
1913 report_finalizer_roots_from_queue (SgenPointerQueue *queue)
1915 GCRootReport report;
1919 for (i = 0; i < queue->next_slot; ++i) {
1920 void *obj = queue->data [i];
1923 add_profile_gc_root (&report, obj, MONO_PROFILE_GC_ROOT_FINALIZER, 0);
1925 notify_gc_roots (&report);
1929 report_finalizer_roots (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
1931 report_finalizer_roots_from_queue (fin_ready_queue);
1932 report_finalizer_roots_from_queue (critical_fin_queue);
1935 static GCRootReport *root_report;
1938 single_arg_report_root (MonoObject **obj, void *gc_data)
1941 add_profile_gc_root (root_report, *obj, MONO_PROFILE_GC_ROOT_OTHER, 0);
1945 precisely_report_roots_from (GCRootReport *report, void** start_root, void** end_root, mword desc)
1947 switch (desc & ROOT_DESC_TYPE_MASK) {
1948 case ROOT_DESC_BITMAP:
1949 desc >>= ROOT_DESC_TYPE_SHIFT;
1951 if ((desc & 1) && *start_root) {
1952 add_profile_gc_root (report, *start_root, MONO_PROFILE_GC_ROOT_OTHER, 0);
1958 case ROOT_DESC_COMPLEX: {
1959 gsize *bitmap_data = (gsize *)sgen_get_complex_descriptor_bitmap (desc);
1960 gsize bwords = (*bitmap_data) - 1;
1961 void **start_run = start_root;
1963 while (bwords-- > 0) {
1964 gsize bmap = *bitmap_data++;
1965 void **objptr = start_run;
1967 if ((bmap & 1) && *objptr) {
1968 add_profile_gc_root (report, *objptr, MONO_PROFILE_GC_ROOT_OTHER, 0);
1973 start_run += GC_BITS_PER_WORD;
1977 case ROOT_DESC_USER: {
1978 MonoGCRootMarkFunc marker = (MonoGCRootMarkFunc)sgen_get_user_descriptor_func (desc);
1979 root_report = report;
1980 marker ((MonoObject**)start_root, single_arg_report_root, NULL);
1983 case ROOT_DESC_RUN_LEN:
1984 g_assert_not_reached ();
1986 g_assert_not_reached ();
1991 report_registered_roots_by_type (int root_type)
1993 GCRootReport report;
1997 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], void **, start_root, RootRecord *, root) {
1998 SGEN_LOG (6, "Precise root scan %p-%p (desc: %p)", start_root, root->end_root, (void*)root->root_desc);
1999 precisely_report_roots_from (&report, start_root, (void**)root->end_root, root->root_desc);
2000 } SGEN_HASH_TABLE_FOREACH_END;
2001 notify_gc_roots (&report);
2005 report_registered_roots (void)
2007 report_registered_roots_by_type (ROOT_TYPE_NORMAL);
2008 report_registered_roots_by_type (ROOT_TYPE_WBARRIER);
2012 sgen_client_collecting_minor (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2014 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2015 report_registered_roots ();
2016 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2017 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2020 static GCRootReport major_root_report;
2021 static gboolean profile_roots;
2024 sgen_client_collecting_major_1 (void)
2026 profile_roots = mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS;
2027 memset (&major_root_report, 0, sizeof (GCRootReport));
2031 sgen_client_pinned_los_object (GCObject *obj)
2034 add_profile_gc_root (&major_root_report, (char*)obj, MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
2038 sgen_client_collecting_major_2 (void)
2041 notify_gc_roots (&major_root_report);
2043 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2044 report_registered_roots ();
2048 sgen_client_collecting_major_3 (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2050 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2051 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2054 #define MOVED_OBJECTS_NUM 64
2055 static void *moved_objects [MOVED_OBJECTS_NUM];
2056 static int moved_objects_idx = 0;
2058 static SgenPointerQueue moved_objects_queue = SGEN_POINTER_QUEUE_INIT (INTERNAL_MEM_MOVED_OBJECT);
2061 mono_sgen_register_moved_object (void *obj, void *destination)
2064 * This function can be called from SGen's worker threads. We want to try
2065 * and avoid exposing those threads to the profiler API, so queue up move
2066 * events and send them later when the main GC thread calls
2067 * mono_sgen_gc_event_moves ().
2069 * TODO: Once SGen has multiple worker threads, we need to switch to a
2070 * lock-free data structure for the queue as multiple threads will be
2071 * adding to it at the same time.
2073 if (sgen_thread_pool_is_thread_pool_thread (mono_native_thread_id_get ())) {
2074 sgen_pointer_queue_add (&moved_objects_queue, obj);
2075 sgen_pointer_queue_add (&moved_objects_queue, destination);
2077 if (moved_objects_idx == MOVED_OBJECTS_NUM) {
2078 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2079 moved_objects_idx = 0;
2082 moved_objects [moved_objects_idx++] = obj;
2083 moved_objects [moved_objects_idx++] = destination;
2088 mono_sgen_gc_event_moves (void)
2090 while (!sgen_pointer_queue_is_empty (&moved_objects_queue)) {
2091 void *dst = sgen_pointer_queue_pop (&moved_objects_queue);
2092 void *src = sgen_pointer_queue_pop (&moved_objects_queue);
2094 mono_sgen_register_moved_object (src, dst);
2097 if (moved_objects_idx) {
2098 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2099 moved_objects_idx = 0;
2107 #define REFS_SIZE 128
2110 MonoGCReferences callback;
2114 MonoObject *refs [REFS_SIZE];
2115 uintptr_t offsets [REFS_SIZE];
2119 #define HANDLE_PTR(ptr,obj) do { \
2121 if (hwi->count == REFS_SIZE) { \
2122 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data); \
2126 hwi->offsets [hwi->count] = (char*)(ptr)-(char*)start; \
2127 hwi->refs [hwi->count++] = *(ptr); \
2132 collect_references (HeapWalkInfo *hwi, GCObject *obj, size_t size)
2134 char *start = (char*)obj;
2135 mword desc = sgen_obj_get_descriptor (obj);
2137 #include "sgen/sgen-scan-object.h"
2141 walk_references (GCObject *start, size_t size, void *data)
2143 HeapWalkInfo *hwi = (HeapWalkInfo *)data;
2146 collect_references (hwi, start, size);
2147 if (hwi->count || !hwi->called)
2148 hwi->callback (start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data);
2152 * mono_gc_walk_heap:
2153 * @flags: flags for future use
2154 * @callback: a function pointer called for each object in the heap
2155 * @data: a user data pointer that is passed to callback
2157 * This function can be used to iterate over all the live objects in the heap:
2158 * for each object, @callback is invoked, providing info about the object's
2159 * location in memory, its class, its size and the objects it references.
2160 * For each referenced object it's offset from the object address is
2161 * reported in the offsets array.
2162 * The object references may be buffered, so the callback may be invoked
2163 * multiple times for the same object: in all but the first call, the size
2164 * argument will be zero.
2165 * Note that this function can be only called in the #MONO_GC_EVENT_PRE_START_WORLD
2166 * profiler event handler.
2168 * Returns: a non-zero value if the GC doesn't support heap walking
2171 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
2176 hwi.callback = callback;
2179 sgen_clear_nursery_fragments ();
2180 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data, walk_references, &hwi, FALSE, TRUE);
2182 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, walk_references, &hwi);
2183 sgen_los_iterate_objects (walk_references, &hwi);
2193 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
2195 gc_callbacks = *callbacks;
2199 mono_gc_get_gc_callbacks ()
2201 return &gc_callbacks;
2205 sgen_client_thread_register (SgenThreadInfo* info, void *stack_bottom_fallback)
2208 guint8 *staddr = NULL;
2210 #ifndef HAVE_KW_THREAD
2211 g_assert (!mono_native_tls_get_value (thread_info_key));
2212 mono_native_tls_set_value (thread_info_key, info);
2214 sgen_thread_info = info;
2217 info->client_info.skip = 0;
2219 info->client_info.stack_start = NULL;
2221 #ifdef SGEN_POSIX_STW
2222 info->client_info.stop_count = -1;
2223 info->client_info.signal = 0;
2226 mono_thread_info_get_stack_bounds (&staddr, &stsize);
2228 info->client_info.stack_start_limit = staddr;
2229 info->client_info.stack_end = staddr + stsize;
2231 gsize stack_bottom = (gsize)stack_bottom_fallback;
2232 stack_bottom += 4095;
2233 stack_bottom &= ~4095;
2234 info->client_info.stack_end = (char*)stack_bottom;
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.stack_end);
2246 info->client_info.info.handle_stack = mono_handle_stack_alloc ();
2250 sgen_client_thread_unregister (SgenThreadInfo *p)
2252 MonoNativeThreadId tid;
2254 #ifndef HAVE_KW_THREAD
2255 mono_native_tls_set_value (thread_info_key, NULL);
2257 sgen_thread_info = NULL;
2260 tid = mono_thread_info_get_tid (p);
2262 if (p->client_info.info.runtime_thread)
2263 mono_threads_add_joinable_thread ((gpointer)tid);
2265 if (mono_gc_get_gc_callbacks ()->thread_detach_func) {
2266 mono_gc_get_gc_callbacks ()->thread_detach_func (p->client_info.runtime_data);
2267 p->client_info.runtime_data = NULL;
2270 binary_protocol_thread_unregister ((gpointer)tid);
2271 SGEN_LOG (3, "unregister thread %p (%p)", p, (gpointer)tid);
2273 HandleStack *handles = (HandleStack*) p->client_info.info.handle_stack;
2274 p->client_info.info.handle_stack = NULL;
2275 mono_handle_stack_free (handles);
2279 mono_gc_set_skip_thread (gboolean skip)
2281 SgenThreadInfo *info = mono_thread_info_current ();
2284 info->client_info.gc_disabled = skip;
2289 is_critical_method (MonoMethod *method)
2291 return mono_runtime_is_critical_method (method) || sgen_is_critical_method (method);
2295 thread_in_critical_region (SgenThreadInfo *info)
2297 return info->client_info.in_critical_region;
2301 sgen_thread_attach (SgenThreadInfo *info)
2303 if (mono_gc_get_gc_callbacks ()->thread_attach_func && !info->client_info.runtime_data)
2304 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2308 sgen_thread_detach (SgenThreadInfo *p)
2310 /* If a delegate is passed to native code and invoked on a thread we dont
2311 * know about, marshal will register it with mono_threads_attach_coop, but
2312 * we have no way of knowing when that thread goes away. SGen has a TSD
2313 * so we assume that if the domain is still registered, we can detach
2316 if (mono_thread_internal_current_is_attached ())
2317 mono_thread_detach_internal (mono_thread_internal_current ());
2321 mono_gc_register_thread (void *baseptr)
2323 return mono_thread_info_attach (baseptr) != NULL;
2327 mono_gc_is_gc_thread (void)
2331 result = mono_thread_info_current () != NULL;
2337 sgen_client_thread_register_worker (void)
2339 mono_thread_info_register_small_id ();
2340 mono_native_thread_set_name (mono_native_thread_id_get (), "SGen worker");
2343 /* Variables holding start/end nursery so it won't have to be passed at every call */
2344 static void *scan_area_arg_start, *scan_area_arg_end;
2347 mono_gc_conservatively_scan_area (void *start, void *end)
2349 sgen_conservatively_pin_objects_from ((void **)start, (void **)end, scan_area_arg_start, scan_area_arg_end, PIN_TYPE_STACK);
2353 mono_gc_scan_object (void *obj, void *gc_data)
2355 ScanCopyContext *ctx = (ScanCopyContext *)gc_data;
2356 ctx->ops->copy_or_mark_object ((GCObject**)&obj, ctx->queue);
2361 * Mark from thread stacks and registers.
2364 sgen_client_scan_thread_data (void *start_nursery, void *end_nursery, gboolean precise, ScanCopyContext ctx)
2366 scan_area_arg_start = start_nursery;
2367 scan_area_arg_end = end_nursery;
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.stack_end, (char*)info->client_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.stack_end, (char*)info->client_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.stack_end, (char*)info->client_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.stack_end, skip_reason);
2392 g_assert (info->client_info.stack_start);
2393 g_assert (info->client_info.stack_end);
2395 aligned_stack_start = (void*)(mword) ALIGN_TO ((mword)info->client_info.stack_start, SIZEOF_VOID_P);
2397 /* Windows uses a guard page before the committed stack memory pages to detect when the
2398 stack needs to be grown. If we suspend a thread just after a function prolog has
2399 decremented the stack pointer to point into the guard page but before the thread has
2400 been able to read or write to that page, starting the stack scan at aligned_stack_start
2401 will raise a STATUS_GUARD_PAGE_VIOLATION and the process will crash. This code uses
2402 VirtualQuery() to determine whether stack_start points into the guard page and then
2403 updates aligned_stack_start to point at the next non-guard page. */
2404 MEMORY_BASIC_INFORMATION mem_info;
2405 SIZE_T result = VirtualQuery(info->client_info.stack_start, &mem_info, sizeof(mem_info));
2406 g_assert (result != 0);
2407 if (mem_info.Protect & PAGE_GUARD) {
2408 aligned_stack_start = ((char*) mem_info.BaseAddress) + mem_info.RegionSize;
2412 g_assert (info->client_info.suspend_done);
2413 SGEN_LOG (3, "Scanning thread %p, range: %p-%p, size: %zd, pinned=%zd", info, info->client_info.stack_start, info->client_info.stack_end, (char*)info->client_info.stack_end - (char*)info->client_info.stack_start, sgen_get_pinned_count ());
2414 if (mono_gc_get_gc_callbacks ()->thread_mark_func && !conservative_stack_mark) {
2415 mono_gc_get_gc_callbacks ()->thread_mark_func (info->client_info.runtime_data, (guint8 *)aligned_stack_start, (guint8 *)info->client_info.stack_end, precise, &ctx);
2416 } else if (!precise) {
2417 if (!conservative_stack_mark) {
2418 fprintf (stderr, "Precise stack mark not supported - disabling.\n");
2419 conservative_stack_mark = TRUE;
2421 //FIXME we should eventually use the new stack_mark from coop
2422 sgen_conservatively_pin_objects_from ((void **)aligned_stack_start, (void **)info->client_info.stack_end, start_nursery, end_nursery, PIN_TYPE_STACK);
2426 sgen_conservatively_pin_objects_from ((void**)&info->client_info.ctx, (void**)(&info->client_info.ctx + 1),
2427 start_nursery, end_nursery, PIN_TYPE_STACK);
2430 // This is used on Coop GC for platforms where we cannot get the data for individual registers.
2431 // We force a spill of all registers into the stack and pass a chunk of data into sgen.
2432 //FIXME under coop, for now, what we need to ensure is that we scan any extra memory from info->client_info.stack_end to stack_mark
2433 MonoThreadUnwindState *state = &info->client_info.info.thread_saved_state [SELF_SUSPEND_STATE_INDEX];
2434 if (state && state->gc_stackdata) {
2435 sgen_conservatively_pin_objects_from ((void **)state->gc_stackdata, (void**)((char*)state->gc_stackdata + state->gc_stackdata_size),
2436 start_nursery, end_nursery, PIN_TYPE_STACK);
2440 if (precise && info->client_info.info.handle_stack) {
2441 mono_handle_stack_scan ((HandleStack*)info->client_info.info.handle_stack, (GcScanFunc)ctx.ops->copy_or_mark_object, ctx.queue);
2443 } FOREACH_THREAD_END
2447 * mono_gc_set_stack_end:
2449 * Set the end of the current threads stack to STACK_END. The stack space between
2450 * STACK_END and the real end of the threads stack will not be scanned during collections.
2453 mono_gc_set_stack_end (void *stack_end)
2455 SgenThreadInfo *info;
2458 info = mono_thread_info_current ();
2460 SGEN_ASSERT (0, stack_end < info->client_info.stack_end, "Can only lower stack end");
2461 info->client_info.stack_end = stack_end;
2471 mono_gc_register_root (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2473 return sgen_register_root (start, size, descr, descr ? ROOT_TYPE_NORMAL : ROOT_TYPE_PINNED, source, msg);
2477 mono_gc_register_root_wbarrier (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2479 return sgen_register_root (start, size, descr, ROOT_TYPE_WBARRIER, source, msg);
2483 mono_gc_deregister_root (char* addr)
2485 sgen_deregister_root (addr);
2494 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
2496 return pthread_create (new_thread, attr, start_routine, arg);
2505 sgen_client_total_allocated_heap_changed (size_t allocated_heap)
2507 mono_runtime_resource_check_limit (MONO_RESOURCE_GC_HEAP, allocated_heap);
2511 mono_gc_user_markers_supported (void)
2517 mono_object_is_alive (MonoObject* o)
2523 mono_gc_get_generation (MonoObject *obj)
2525 if (sgen_ptr_in_nursery (obj))
2531 mono_gc_get_gc_name (void)
2537 mono_gc_get_description (void)
2539 #ifdef HAVE_CONC_GC_AS_DEFAULT
2540 return g_strdup ("sgen (concurrent by default)");
2542 return g_strdup ("sgen");
2547 mono_gc_set_desktop_mode (void)
2552 mono_gc_is_moving (void)
2558 mono_gc_is_disabled (void)
2564 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
2571 mono_gc_max_generation (void)
2577 mono_gc_precise_stack_mark_enabled (void)
2579 return !conservative_stack_mark;
2583 mono_gc_collect (int generation)
2585 sgen_gc_collect (generation);
2589 mono_gc_collection_count (int generation)
2591 return sgen_gc_collection_count (generation);
2595 mono_gc_get_used_size (void)
2597 return (int64_t)sgen_gc_get_used_size ();
2601 mono_gc_get_heap_size (void)
2603 return (int64_t)sgen_gc_get_total_heap_allocation ();
2607 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
2609 return sgen_make_user_root_descriptor (marker);
2613 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
2615 return SGEN_DESC_STRING;
2619 mono_gc_get_nursery (int *shift_bits, size_t *size)
2621 *size = sgen_nursery_size;
2622 *shift_bits = DEFAULT_NURSERY_BITS;
2623 return sgen_get_nursery_start ();
2627 mono_gc_get_los_limit (void)
2629 return SGEN_MAX_SMALL_OBJ_SIZE;
2633 sgen_client_default_metadata (void)
2635 return mono_domain_get ();
2639 sgen_client_metadata_for_object (GCObject *obj)
2641 return mono_object_domain (obj);
2645 * mono_gchandle_is_in_domain:
2646 * @gchandle: a GCHandle's handle.
2647 * @domain: An application domain.
2649 * Returns: TRUE if the object wrapped by the @gchandle belongs to the specific @domain.
2652 mono_gchandle_is_in_domain (guint32 gchandle, MonoDomain *domain)
2654 MonoDomain *gchandle_domain = (MonoDomain *)sgen_gchandle_get_metadata (gchandle);
2655 return domain->domain_id == gchandle_domain->domain_id;
2659 * mono_gchandle_free_domain:
2660 * @unloading: domain that is unloading
2662 * Function used internally to cleanup any GC handle for objects belonging
2663 * to the specified domain during appdomain unload.
2666 mono_gchandle_free_domain (MonoDomain *unloading)
2671 null_link_if_in_domain (gpointer hidden, GCHandleType handle_type, int max_generation, gpointer user)
2673 MonoDomain *unloading_domain = (MonoDomain *)user;
2674 MonoDomain *obj_domain;
2675 gboolean is_weak = MONO_GC_HANDLE_TYPE_IS_WEAK (handle_type);
2676 if (MONO_GC_HANDLE_IS_OBJECT_POINTER (hidden)) {
2677 MonoObject *obj = (MonoObject *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2678 obj_domain = mono_object_domain (obj);
2680 obj_domain = (MonoDomain *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2682 if (unloading_domain->domain_id == obj_domain->domain_id)
2688 sgen_null_links_for_domain (MonoDomain *domain)
2691 for (type = HANDLE_TYPE_MIN; type < HANDLE_TYPE_MAX; ++type)
2692 sgen_gchandle_iterate ((GCHandleType)type, GENERATION_OLD, null_link_if_in_domain, domain);
2696 mono_gchandle_set_target (guint32 gchandle, MonoObject *obj)
2698 sgen_gchandle_set_target (gchandle, obj);
2702 sgen_client_gchandle_created (int handle_type, GCObject *obj, guint32 handle)
2704 #ifndef DISABLE_PERFCOUNTERS
2705 mono_perfcounters->gc_num_handles++;
2707 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_CREATED, handle_type, handle, obj);
2711 sgen_client_gchandle_destroyed (int handle_type, guint32 handle)
2713 #ifndef DISABLE_PERFCOUNTERS
2714 mono_perfcounters->gc_num_handles--;
2716 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_DESTROYED, handle_type, handle, NULL);
2720 sgen_client_ensure_weak_gchandles_accessible (void)
2723 * During the second bridge processing step the world is
2724 * running again. That step processes all weak links once
2725 * more to null those that refer to dead objects. Before that
2726 * is completed, those links must not be followed, so we
2727 * conservatively wait for bridge processing when any weak
2728 * link is dereferenced.
2730 /* FIXME: A GC can occur after this check fails, in which case we
2731 * should wait for bridge processing but would fail to do so.
2733 if (G_UNLIKELY (bridge_processing_in_progress))
2734 mono_gc_wait_for_bridge_processing ();
2738 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
2742 result = func (data);
2743 UNLOCK_INTERRUPTION;
2748 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
2754 mono_gc_get_card_table (int *shift_bits, gpointer *mask)
2756 return sgen_get_card_table_configuration (shift_bits, mask);
2760 mono_gc_card_table_nursery_check (void)
2762 return !sgen_get_major_collector ()->is_concurrent;
2765 /* Negative value to remove */
2767 mono_gc_add_memory_pressure (gint64 value)
2769 /* FIXME: Implement at some point? */
2777 sgen_client_degraded_allocation (size_t size)
2779 static int last_major_gc_warned = -1;
2780 static int num_degraded = 0;
2782 if (last_major_gc_warned < (int)gc_stats.major_gc_count) {
2784 if (num_degraded == 1 || num_degraded == 3)
2785 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Degraded allocation. Consider increasing nursery-size if the warning persists.");
2786 else if (num_degraded == 10)
2787 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Repeated degraded allocation. Consider increasing nursery-size.");
2788 last_major_gc_warned = gc_stats.major_gc_count;
2797 sgen_client_description_for_internal_mem_type (int type)
2800 case INTERNAL_MEM_EPHEMERON_LINK: return "ephemeron-link";
2801 case INTERNAL_MEM_MOVED_OBJECT: return "moved-object";
2808 sgen_client_pre_collection_checks (void)
2810 if (sgen_mono_xdomain_checks) {
2811 sgen_clear_nursery_fragments ();
2812 sgen_check_for_xdomain_refs ();
2817 sgen_client_vtable_is_inited (MonoVTable *vt)
2819 return vt->klass->inited;
2823 sgen_client_vtable_get_namespace (MonoVTable *vt)
2825 return vt->klass->name_space;
2829 sgen_client_vtable_get_name (MonoVTable *vt)
2831 return vt->klass->name;
2839 sgen_client_init (void)
2842 MonoThreadInfoCallbacks cb;
2844 cb.thread_register = sgen_thread_register;
2845 cb.thread_detach = sgen_thread_detach;
2846 cb.thread_unregister = sgen_thread_unregister;
2847 cb.thread_attach = sgen_thread_attach;
2848 cb.mono_method_is_critical = (gboolean (*)(void *))is_critical_method;
2849 cb.mono_thread_in_critical_region = thread_in_critical_region;
2851 mono_threads_init (&cb, sizeof (SgenThreadInfo));
2853 ///* Keep this the default for now */
2854 /* Precise marking is broken on all supported targets. Disable until fixed. */
2855 conservative_stack_mark = TRUE;
2857 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_EPHEMERON_LINK, sizeof (EphemeronLinkNode));
2859 mono_sgen_init_stw ();
2861 #ifndef HAVE_KW_THREAD
2862 mono_native_tls_alloc (&thread_info_key, NULL);
2863 #if defined(TARGET_OSX) || defined(TARGET_WIN32) || defined(TARGET_ANDROID) || defined(TARGET_IOS)
2865 * CEE_MONO_TLS requires the tls offset, not the key, so the code below only works on darwin,
2866 * where the two are the same.
2868 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO, thread_info_key);
2872 int tls_offset = -1;
2873 MONO_THREAD_VAR_OFFSET (sgen_thread_info, tls_offset);
2874 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO, tls_offset);
2878 mono_gc_register_thread (&dummy);
2882 sgen_client_handle_gc_param (const char *opt)
2884 if (g_str_has_prefix (opt, "stack-mark=")) {
2885 opt = strchr (opt, '=') + 1;
2886 if (!strcmp (opt, "precise")) {
2887 conservative_stack_mark = FALSE;
2888 } else if (!strcmp (opt, "conservative")) {
2889 conservative_stack_mark = TRUE;
2891 sgen_env_var_error (MONO_GC_PARAMS_NAME, conservative_stack_mark ? "Using `conservative`." : "Using `precise`.",
2892 "Invalid value `%s` for `stack-mark` option, possible values are: `precise`, `conservative`.", opt);
2894 } else if (g_str_has_prefix (opt, "bridge-implementation=")) {
2895 opt = strchr (opt, '=') + 1;
2896 sgen_set_bridge_implementation (opt);
2897 } else if (g_str_has_prefix (opt, "toggleref-test")) {
2898 /* FIXME: This should probably in MONO_GC_DEBUG */
2899 sgen_register_test_toggleref_callback ();
2900 } else if (!sgen_bridge_handle_gc_param (opt)) {
2907 sgen_client_print_gc_params_usage (void)
2909 fprintf (stderr, " stack-mark=MARK-METHOD (where MARK-METHOD is 'precise' or 'conservative')\n");
2913 sgen_client_handle_gc_debug (const char *opt)
2915 if (!strcmp (opt, "xdomain-checks")) {
2916 sgen_mono_xdomain_checks = TRUE;
2917 } else if (!strcmp (opt, "do-not-finalize")) {
2918 mono_do_not_finalize = TRUE;
2919 } else if (g_str_has_prefix (opt, "do-not-finalize=")) {
2920 opt = strchr (opt, '=') + 1;
2921 mono_do_not_finalize = TRUE;
2922 mono_do_not_finalize_class_names = g_strsplit (opt, ",", 0);
2923 } else if (!strcmp (opt, "log-finalizers")) {
2924 log_finalizers = TRUE;
2925 } else if (!strcmp (opt, "no-managed-allocator")) {
2926 sgen_set_use_managed_allocator (FALSE);
2927 } else if (!sgen_bridge_handle_gc_debug (opt)) {
2934 sgen_client_print_gc_debug_usage (void)
2936 fprintf (stderr, " xdomain-checks\n");
2937 fprintf (stderr, " do-not-finalize\n");
2938 fprintf (stderr, " log-finalizers\n");
2939 fprintf (stderr, " no-managed-allocator\n");
2940 sgen_bridge_print_gc_debug_usage ();
2945 sgen_client_get_provenance (void)
2947 #ifdef SGEN_OBJECT_PROVENANCE
2948 MonoGCCallbacks *cb = mono_gc_get_gc_callbacks ();
2949 gpointer (*get_provenance_func) (void);
2952 get_provenance_func = cb->get_provenance_func;
2953 if (get_provenance_func)
2954 return get_provenance_func ();
2962 sgen_client_describe_invalid_pointer (GCObject *ptr)
2964 sgen_bridge_describe_pointer (ptr);
2967 static gboolean gc_inited;
2970 mono_gc_base_init (void)
2975 mono_counters_init ();
2978 mono_w32handle_init ();
2981 #ifdef HEAVY_STATISTICS
2982 mono_counters_register ("los marked cards", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_marked_cards);
2983 mono_counters_register ("los array cards scanned ", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_cards);
2984 mono_counters_register ("los array remsets", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_remsets);
2986 mono_counters_register ("WBarrier set arrayref", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_set_arrayref);
2987 mono_counters_register ("WBarrier value copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_value_copy);
2988 mono_counters_register ("WBarrier object copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_object_copy);
2993 if (nursery_canaries_enabled ())
2994 sgen_set_use_managed_allocator (FALSE);
2996 #if defined(HAVE_KW_THREAD)
2997 /* This can happen with using libmonosgen.so */
2998 if (mono_tls_key_get_offset (TLS_KEY_SGEN_THREAD_INFO) == -1)
2999 sgen_set_use_managed_allocator (FALSE);
3006 mono_gc_base_cleanup (void)
3008 sgen_thread_pool_shutdown ();
3010 // We should have consumed any outstanding moves.
3011 g_assert (sgen_pointer_queue_is_empty (&moved_objects_queue));
3015 mono_gc_is_null (void)