2 * sgen-mono.c: SGen features specific to Mono.
4 * Copyright (C) 2014 Xamarin Inc
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License 2.0 as published by the Free Software Foundation;
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
15 * You should have received a copy of the GNU Library General Public
16 * License 2.0 along with this library; if not, write to the Free
17 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include "sgen/sgen-gc.h"
24 #include "sgen/sgen-protocol.h"
25 #include "metadata/monitor.h"
26 #include "sgen/sgen-layout-stats.h"
27 #include "sgen/sgen-client.h"
28 #include "sgen/sgen-cardtable.h"
29 #include "sgen/sgen-pinning.h"
30 #include "metadata/marshal.h"
31 #include "metadata/method-builder.h"
32 #include "metadata/abi-details.h"
33 #include "metadata/mono-gc.h"
34 #include "metadata/runtime.h"
35 #include "metadata/sgen-bridge-internal.h"
36 #include "metadata/gc-internal.h"
37 #include "utils/mono-memory-model.h"
38 #include "utils/mono-logger-internal.h"
40 #ifdef HEAVY_STATISTICS
41 static guint64 stat_wbarrier_set_arrayref
= 0;
42 static guint64 stat_wbarrier_value_copy
= 0;
43 static guint64 stat_wbarrier_object_copy
= 0;
45 static guint64 los_marked_cards
;
46 static guint64 los_array_cards
;
47 static guint64 los_array_remsets
;
50 /* If set, mark stacks conservatively, even if precise marking is possible */
51 static gboolean conservative_stack_mark
= FALSE
;
52 /* If set, check that there are no references to the domain left at domain unload */
53 gboolean sgen_mono_xdomain_checks
= FALSE
;
55 /* Functions supplied by the runtime to be called by the GC */
56 static MonoGCCallbacks gc_callbacks
;
59 __thread SgenThreadInfo
*sgen_thread_info
;
61 MonoNativeTlsKey thread_info_key
;
64 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
66 #define OPDEF(a,b,c,d,e,f,g,h,i,j) \
70 #include "mono/cil/opcode.def"
81 ptr_on_stack (void *ptr
)
83 gpointer stack_start
= &stack_start
;
84 SgenThreadInfo
*info
= mono_thread_info_current ();
86 if (ptr
>= stack_start
&& ptr
< (gpointer
)info
->client_info
.stack_end
)
91 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
93 #define HANDLE_PTR(ptr,obj) do { \
94 gpointer o = *(gpointer*)(ptr); \
96 gpointer d = ((char*)dest) + ((char*)(ptr) - (char*)(obj)); \
97 binary_protocol_wbarrier (d, o, (gpointer) SGEN_LOAD_VTABLE (o)); \
102 scan_object_for_binary_protocol_copy_wbarrier (gpointer dest
, char *start
, mword desc
)
104 #define SCAN_OBJECT_NOVTABLE
105 #include "sgen/sgen-scan-object.h"
110 mono_gc_wbarrier_value_copy (gpointer dest
, gpointer src
, int count
, MonoClass
*klass
)
112 HEAVY_STAT (++stat_wbarrier_value_copy
);
113 g_assert (klass
->valuetype
);
115 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
);
117 if (sgen_ptr_in_nursery (dest
) || ptr_on_stack (dest
) || !sgen_gc_descr_has_references ((mword
)klass
->gc_descr
)) {
118 size_t element_size
= mono_class_value_size (klass
, NULL
);
119 size_t size
= count
* element_size
;
120 mono_gc_memmove_atomic (dest
, src
, size
);
124 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
125 if (binary_protocol_is_heavy_enabled ()) {
126 size_t element_size
= mono_class_value_size (klass
, NULL
);
128 for (i
= 0; i
< count
; ++i
) {
129 scan_object_for_binary_protocol_copy_wbarrier ((char*)dest
+ i
* element_size
,
130 (char*)src
+ i
* element_size
- sizeof (MonoObject
),
131 (mword
) klass
->gc_descr
);
136 sgen_get_remset ()->wbarrier_value_copy (dest
, src
, count
, mono_class_value_size (klass
, NULL
));
140 * mono_gc_wbarrier_object_copy:
142 * Write barrier to call when obj is the result of a clone or copy of an object.
145 mono_gc_wbarrier_object_copy (MonoObject
* obj
, MonoObject
*src
)
149 HEAVY_STAT (++stat_wbarrier_object_copy
);
151 if (sgen_ptr_in_nursery (obj
) || ptr_on_stack (obj
) || !SGEN_OBJECT_HAS_REFERENCES (src
)) {
152 size
= mono_object_class (obj
)->instance_size
;
153 mono_gc_memmove_aligned ((char*)obj
+ sizeof (MonoObject
), (char*)src
+ sizeof (MonoObject
),
154 size
- sizeof (MonoObject
));
158 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
159 if (binary_protocol_is_heavy_enabled ())
160 scan_object_for_binary_protocol_copy_wbarrier (obj
, (char*)src
, (mword
) src
->vtable
->gc_descr
);
163 sgen_get_remset ()->wbarrier_object_copy (obj
, src
);
167 mono_gc_wbarrier_set_arrayref (MonoArray
*arr
, gpointer slot_ptr
, MonoObject
* value
)
169 HEAVY_STAT (++stat_wbarrier_set_arrayref
);
170 if (sgen_ptr_in_nursery (slot_ptr
)) {
171 *(void**)slot_ptr
= value
;
174 SGEN_LOG (8, "Adding remset at %p", slot_ptr
);
176 binary_protocol_wbarrier (slot_ptr
, value
, value
->vtable
);
178 sgen_get_remset ()->wbarrier_set_field ((GCObject
*)arr
, slot_ptr
, value
);
182 mono_gc_wbarrier_set_field (MonoObject
*obj
, gpointer field_ptr
, MonoObject
* value
)
184 mono_gc_wbarrier_set_arrayref ((MonoArray
*)obj
, field_ptr
, value
);
188 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest
, gpointer _src
, int size
, unsigned bitmap
)
190 sgen_wbarrier_value_copy_bitmap (_dest
, _src
, size
, bitmap
);
193 static MonoMethod
*write_barrier_conc_method
;
194 static MonoMethod
*write_barrier_noconc_method
;
197 sgen_is_critical_method (MonoMethod
*method
)
199 return (method
== write_barrier_conc_method
|| method
== write_barrier_noconc_method
|| sgen_is_managed_allocator (method
));
203 sgen_has_critical_method (void)
205 return write_barrier_conc_method
|| write_barrier_noconc_method
|| sgen_has_managed_allocator ();
211 emit_nursery_check (MonoMethodBuilder
*mb
, int *nursery_check_return_labels
, gboolean is_concurrent
)
213 int shifted_nursery_start
= mono_mb_add_local (mb
, &mono_defaults
.int_class
->byval_arg
);
215 memset (nursery_check_return_labels
, 0, sizeof (int) * 2);
216 // if (ptr_in_nursery (ptr)) return;
218 * Masking out the bits might be faster, but we would have to use 64 bit
219 * immediates, which might be slower.
221 mono_mb_emit_byte (mb
, MONO_CUSTOM_PREFIX
);
222 mono_mb_emit_byte (mb
, CEE_MONO_LDPTR_NURSERY_START
);
223 mono_mb_emit_icon (mb
, DEFAULT_NURSERY_BITS
);
224 mono_mb_emit_byte (mb
, CEE_SHR_UN
);
225 mono_mb_emit_stloc (mb
, shifted_nursery_start
);
227 mono_mb_emit_ldarg (mb
, 0);
228 mono_mb_emit_icon (mb
, DEFAULT_NURSERY_BITS
);
229 mono_mb_emit_byte (mb
, CEE_SHR_UN
);
230 mono_mb_emit_ldloc (mb
, shifted_nursery_start
);
231 nursery_check_return_labels
[0] = mono_mb_emit_branch (mb
, CEE_BEQ
);
233 if (!is_concurrent
) {
234 // if (!ptr_in_nursery (*ptr)) return;
235 mono_mb_emit_ldarg (mb
, 0);
236 mono_mb_emit_byte (mb
, CEE_LDIND_I
);
237 mono_mb_emit_icon (mb
, DEFAULT_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
[1] = mono_mb_emit_branch (mb
, CEE_BNE_UN
);
246 mono_gc_get_specific_write_barrier (gboolean is_concurrent
)
249 MonoMethodBuilder
*mb
;
250 MonoMethodSignature
*sig
;
251 MonoMethod
**write_barrier_method_addr
;
252 #ifdef MANAGED_WBARRIER
253 int i
, nursery_check_labels
[2];
256 // FIXME: Maybe create a separate version for ctors (the branch would be
257 // correctly predicted more times)
259 write_barrier_method_addr
= &write_barrier_conc_method
;
261 write_barrier_method_addr
= &write_barrier_noconc_method
;
263 if (*write_barrier_method_addr
)
264 return *write_barrier_method_addr
;
266 /* Create the IL version of mono_gc_barrier_generic_store () */
267 sig
= mono_metadata_signature_alloc (mono_defaults
.corlib
, 1);
268 sig
->ret
= &mono_defaults
.void_class
->byval_arg
;
269 sig
->params
[0] = &mono_defaults
.int_class
->byval_arg
;
272 mb
= mono_mb_new (mono_defaults
.object_class
, "wbarrier_conc", MONO_WRAPPER_WRITE_BARRIER
);
274 mb
= mono_mb_new (mono_defaults
.object_class
, "wbarrier_noconc", MONO_WRAPPER_WRITE_BARRIER
);
277 #ifdef MANAGED_WBARRIER
278 emit_nursery_check (mb
, nursery_check_labels
, is_concurrent
);
280 addr = sgen_cardtable + ((address >> CARD_BITS) & CARD_MASK)
284 LDC_PTR sgen_cardtable
290 if (SGEN_HAVE_OVERLAPPING_CARDS) {
291 LDC_PTR card_table_mask
298 mono_mb_emit_byte (mb
, MONO_CUSTOM_PREFIX
);
299 mono_mb_emit_byte (mb
, CEE_MONO_LDPTR_CARD_TABLE
);
300 mono_mb_emit_ldarg (mb
, 0);
301 mono_mb_emit_icon (mb
, CARD_BITS
);
302 mono_mb_emit_byte (mb
, CEE_SHR_UN
);
303 mono_mb_emit_byte (mb
, CEE_CONV_I
);
304 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
305 #if SIZEOF_VOID_P == 8
306 mono_mb_emit_icon8 (mb
, CARD_MASK
);
308 mono_mb_emit_icon (mb
, CARD_MASK
);
310 mono_mb_emit_byte (mb
, CEE_CONV_I
);
311 mono_mb_emit_byte (mb
, CEE_AND
);
313 mono_mb_emit_byte (mb
, CEE_ADD
);
314 mono_mb_emit_icon (mb
, 1);
315 mono_mb_emit_byte (mb
, CEE_STIND_I1
);
318 for (i
= 0; i
< 2; ++i
) {
319 if (nursery_check_labels
[i
])
320 mono_mb_patch_branch (mb
, nursery_check_labels
[i
]);
322 mono_mb_emit_byte (mb
, CEE_RET
);
324 mono_mb_emit_ldarg (mb
, 0);
325 mono_mb_emit_icall (mb
, mono_gc_wbarrier_generic_nostore
);
326 mono_mb_emit_byte (mb
, CEE_RET
);
329 res
= mono_mb_create_method (mb
, sig
, 16);
333 if (*write_barrier_method_addr
) {
334 /* Already created */
335 mono_free_method (res
);
337 /* double-checked locking */
338 mono_memory_barrier ();
339 *write_barrier_method_addr
= res
;
343 return *write_barrier_method_addr
;
347 mono_gc_get_write_barrier (void)
349 return mono_gc_get_specific_write_barrier (major_collector
.is_concurrent
);
353 * Dummy filler objects
356 /* Vtable of the objects used to fill out nursery fragments before a collection */
357 static GCVTable array_fill_vtable
;
360 get_array_fill_vtable (void)
362 if (!array_fill_vtable
) {
363 static MonoClass klass
;
364 static char _vtable
[sizeof(MonoVTable
)+8];
365 MonoVTable
* vtable
= (MonoVTable
*) ALIGN_TO(_vtable
, 8);
368 MonoDomain
*domain
= mono_get_root_domain ();
371 klass
.element_class
= mono_defaults
.byte_class
;
373 klass
.instance_size
= sizeof (MonoArray
);
374 klass
.sizes
.element_size
= 1;
375 klass
.name
= "array_filler_type";
377 vtable
->klass
= &klass
;
379 vtable
->gc_descr
= mono_gc_make_descr_for_array (TRUE
, &bmap
, 0, 1);
382 array_fill_vtable
= vtable
;
384 return array_fill_vtable
;
388 sgen_client_array_fill_range (char *start
, size_t size
)
392 if (size
< sizeof (MonoArray
)) {
393 memset (start
, 0, size
);
397 o
= (MonoArray
*)start
;
398 o
->obj
.vtable
= (MonoVTable
*)get_array_fill_vtable ();
399 /* Mark this as not a real object */
400 o
->obj
.synchronisation
= GINT_TO_POINTER (-1);
402 o
->max_length
= (mono_array_size_t
)(size
- sizeof (MonoArray
));
408 sgen_client_zero_array_fill_header (void *p
, size_t size
)
410 if (size
>= sizeof (MonoArray
)) {
411 memset (p
, 0, sizeof (MonoArray
));
413 static guint8 zeros
[sizeof (MonoArray
)];
415 SGEN_ASSERT (0, !memcmp (p
, zeros
, size
), "TLAB segment must be zeroed out.");
423 static MonoGCFinalizerCallbacks fin_callbacks
;
426 mono_gc_get_vtable_bits (MonoClass
*class)
429 /* FIXME move this to the bridge code */
430 if (sgen_need_bridge_processing ()) {
431 switch (sgen_bridge_class_kind (class)) {
432 case GC_BRIDGE_TRANSPARENT_BRIDGE_CLASS
:
433 case GC_BRIDGE_OPAQUE_BRIDGE_CLASS
:
434 res
= SGEN_GC_BIT_BRIDGE_OBJECT
;
436 case GC_BRIDGE_OPAQUE_CLASS
:
437 res
= SGEN_GC_BIT_BRIDGE_OPAQUE_OBJECT
;
439 case GC_BRIDGE_TRANSPARENT_CLASS
:
443 if (fin_callbacks
.is_class_finalization_aware
) {
444 if (fin_callbacks
.is_class_finalization_aware (class))
445 res
|= SGEN_GC_BIT_FINALIZER_AWARE
;
451 is_finalization_aware (MonoObject
*obj
)
453 MonoVTable
*vt
= SGEN_LOAD_VTABLE (obj
);
454 return (vt
->gc_bits
& SGEN_GC_BIT_FINALIZER_AWARE
) == SGEN_GC_BIT_FINALIZER_AWARE
;
458 sgen_client_object_queued_for_finalization (GCObject
*obj
)
460 if (fin_callbacks
.object_queued_for_finalization
&& is_finalization_aware (obj
))
461 fin_callbacks
.object_queued_for_finalization (obj
);
464 if (G_UNLIKELY (MONO_GC_FINALIZE_ENQUEUE_ENABLED ())) {
465 int gen
= sgen_ptr_in_nursery (obj
) ? GENERATION_NURSERY
: GENERATION_OLD
;
466 GCVTable vt
= SGEN_LOAD_VTABLE (obj
);
467 MONO_GC_FINALIZE_ENQUEUE ((mword
)obj
, sgen_safe_object_get_size (obj
),
468 sgen_client_vtable_get_namespace (vt
), sgen_client_vtable_get_name (vt
), gen
,
469 sgen_client_object_has_critical_finalizer (obj
));
475 mono_gc_register_finalizer_callbacks (MonoGCFinalizerCallbacks
*callbacks
)
477 if (callbacks
->version
!= MONO_GC_FINALIZER_EXTENSION_VERSION
)
478 g_error ("Invalid finalizer callback version. Expected %d but got %d\n", MONO_GC_FINALIZER_EXTENSION_VERSION
, callbacks
->version
);
480 fin_callbacks
= *callbacks
;
484 sgen_client_run_finalize (MonoObject
*obj
)
486 mono_gc_run_finalize (obj
, NULL
);
490 mono_gc_invoke_finalizers (void)
492 return sgen_gc_invoke_finalizers ();
496 mono_gc_pending_finalizers (void)
498 return sgen_have_pending_finalizers ();
502 sgen_client_finalize_notify (void)
504 mono_gc_finalize_notify ();
508 mono_gc_register_for_finalization (MonoObject
*obj
, void *user_data
)
510 sgen_object_register_for_finalization (obj
, user_data
);
514 object_in_domain_predicate (MonoObject
*obj
, void *user_data
)
516 MonoDomain
*domain
= user_data
;
517 if (mono_object_domain (obj
) == domain
) {
518 SGEN_LOG (5, "Unregistering finalizer for object: %p (%s)", obj
, sgen_client_vtable_get_name (SGEN_LOAD_VTABLE (obj
)));
525 * mono_gc_finalizers_for_domain:
526 * @domain: the unloading appdomain
527 * @out_array: output array
528 * @out_size: size of output array
530 * Store inside @out_array up to @out_size objects that belong to the unloading
531 * appdomain @domain. Returns the number of stored items. Can be called repeteadly
532 * until it returns 0.
533 * The items are removed from the finalizer data structure, so the caller is supposed
535 * @out_array should be on the stack to allow the GC to know the objects are still alive.
538 mono_gc_finalizers_for_domain (MonoDomain
*domain
, MonoObject
**out_array
, int out_size
)
540 return sgen_gather_finalizers_if (object_in_domain_predicate
, domain
, out_array
, out_size
);
547 typedef struct _EphemeronLinkNode EphemeronLinkNode
;
549 struct _EphemeronLinkNode
{
550 EphemeronLinkNode
*next
;
559 static EphemeronLinkNode
*ephemeron_list
;
561 /* LOCKING: requires that the GC lock is held */
563 null_ephemerons_for_domain (MonoDomain
*domain
)
565 EphemeronLinkNode
*current
= ephemeron_list
, *prev
= NULL
;
568 MonoObject
*object
= (MonoObject
*)current
->array
;
571 SGEN_ASSERT (0, object
->vtable
, "Can't have objects without vtables.");
573 if (object
&& object
->vtable
->domain
== domain
) {
574 EphemeronLinkNode
*tmp
= current
;
577 prev
->next
= current
->next
;
579 ephemeron_list
= current
->next
;
581 current
= current
->next
;
582 sgen_free_internal (tmp
, INTERNAL_MEM_EPHEMERON_LINK
);
585 current
= current
->next
;
590 /* LOCKING: requires that the GC lock is held */
592 sgen_client_clear_unreachable_ephemerons (ScanCopyContext ctx
)
594 CopyOrMarkObjectFunc copy_func
= ctx
.ops
->copy_or_mark_object
;
595 SgenGrayQueue
*queue
= ctx
.queue
;
596 EphemeronLinkNode
*current
= ephemeron_list
, *prev
= NULL
;
597 Ephemeron
*cur
, *array_end
;
601 MonoArray
*array
= current
->array
;
603 if (!sgen_is_object_alive_for_current_gen ((GCObject
*)array
)) {
604 EphemeronLinkNode
*tmp
= current
;
606 SGEN_LOG (5, "Dead Ephemeron array at %p", array
);
609 prev
->next
= current
->next
;
611 ephemeron_list
= current
->next
;
613 current
= current
->next
;
614 sgen_free_internal (tmp
, INTERNAL_MEM_EPHEMERON_LINK
);
619 copy_func ((GCObject
**)&array
, queue
);
620 current
->array
= array
;
622 SGEN_LOG (5, "Clearing unreachable entries for ephemeron array at %p", array
);
624 cur
= mono_array_addr (array
, Ephemeron
, 0);
625 array_end
= cur
+ mono_array_length_fast (array
);
626 tombstone
= SGEN_LOAD_VTABLE ((GCObject
*)array
)->domain
->ephemeron_tombstone
;
628 for (; cur
< array_end
; ++cur
) {
629 GCObject
*key
= cur
->key
;
631 if (!key
|| key
== tombstone
)
634 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur
- mono_array_addr (array
, Ephemeron
, 0),
635 key
, sgen_is_object_alive_for_current_gen (key
) ? "reachable" : "unreachable",
636 cur
->value
, cur
->value
&& sgen_is_object_alive_for_current_gen (cur
->value
) ? "reachable" : "unreachable");
638 if (!sgen_is_object_alive_for_current_gen (key
)) {
639 cur
->key
= tombstone
;
645 current
= current
->next
;
650 LOCKING: requires that the GC lock is held
652 Limitations: We scan all ephemerons on every collection since the current design doesn't allow for a simple nursery/mature split.
655 sgen_client_mark_ephemerons (ScanCopyContext ctx
)
657 CopyOrMarkObjectFunc copy_func
= ctx
.ops
->copy_or_mark_object
;
658 SgenGrayQueue
*queue
= ctx
.queue
;
659 gboolean nothing_marked
= TRUE
;
660 EphemeronLinkNode
*current
= ephemeron_list
;
661 Ephemeron
*cur
, *array_end
;
664 for (current
= ephemeron_list
; current
; current
= current
->next
) {
665 MonoArray
*array
= current
->array
;
666 SGEN_LOG (5, "Ephemeron array at %p", array
);
668 /*It has to be alive*/
669 if (!sgen_is_object_alive_for_current_gen ((GCObject
*)array
)) {
670 SGEN_LOG (5, "\tnot reachable");
674 copy_func ((GCObject
**)&array
, queue
);
676 cur
= mono_array_addr (array
, Ephemeron
, 0);
677 array_end
= cur
+ mono_array_length_fast (array
);
678 tombstone
= SGEN_LOAD_VTABLE ((GCObject
*)array
)->domain
->ephemeron_tombstone
;
680 for (; cur
< array_end
; ++cur
) {
681 GCObject
*key
= cur
->key
;
683 if (!key
|| key
== tombstone
)
686 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur
- mono_array_addr (array
, Ephemeron
, 0),
687 key
, sgen_is_object_alive_for_current_gen (key
) ? "reachable" : "unreachable",
688 cur
->value
, cur
->value
&& sgen_is_object_alive_for_current_gen (cur
->value
) ? "reachable" : "unreachable");
690 if (sgen_is_object_alive_for_current_gen (key
)) {
691 GCObject
*value
= cur
->value
;
693 copy_func (&cur
->key
, queue
);
695 if (!sgen_is_object_alive_for_current_gen (value
))
696 nothing_marked
= FALSE
;
697 copy_func (&cur
->value
, queue
);
703 SGEN_LOG (5, "Ephemeron run finished. Is it done %d", nothing_marked
);
704 return nothing_marked
;
708 mono_gc_ephemeron_array_add (MonoObject
*obj
)
710 EphemeronLinkNode
*node
;
714 node
= sgen_alloc_internal (INTERNAL_MEM_EPHEMERON_LINK
);
719 node
->array
= (MonoArray
*)obj
;
720 node
->next
= ephemeron_list
;
721 ephemeron_list
= node
;
723 SGEN_LOG (5, "Registered ephemeron array %p", obj
);
734 mono_gc_set_current_thread_appdomain (MonoDomain
*domain
)
736 SgenThreadInfo
*info
= mono_thread_info_current ();
738 /* Could be called from sgen_thread_unregister () with a NULL info */
741 info
->client_info
.stopped_domain
= domain
;
746 need_remove_object_for_domain (GCObject
*start
, MonoDomain
*domain
)
748 if (mono_object_domain (start
) == domain
) {
749 SGEN_LOG (4, "Need to cleanup object %p", start
);
750 binary_protocol_cleanup (start
, (gpointer
)SGEN_LOAD_VTABLE (start
), sgen_safe_object_get_size ((GCObject
*)start
));
757 process_object_for_domain_clearing (GCObject
*start
, MonoDomain
*domain
)
759 MonoVTable
*vt
= SGEN_LOAD_VTABLE (start
);
760 if (vt
->klass
== mono_defaults
.internal_thread_class
)
761 g_assert (mono_object_domain (start
) == mono_get_root_domain ());
762 /* The object could be a proxy for an object in the domain
764 #ifndef DISABLE_REMOTING
765 if (mono_defaults
.real_proxy_class
->supertypes
&& mono_class_has_parent_fast (vt
->klass
, mono_defaults
.real_proxy_class
)) {
766 MonoObject
*server
= ((MonoRealProxy
*)start
)->unwrapped_server
;
768 /* The server could already have been zeroed out, so
769 we need to check for that, too. */
770 if (server
&& (!SGEN_LOAD_VTABLE (server
) || mono_object_domain (server
) == domain
)) {
771 SGEN_LOG (4, "Cleaning up remote pointer in %p to object %p", start
, server
);
772 ((MonoRealProxy
*)start
)->unwrapped_server
= NULL
;
779 clear_domain_process_object (GCObject
*obj
, MonoDomain
*domain
)
783 process_object_for_domain_clearing (obj
, domain
);
784 remove
= need_remove_object_for_domain (obj
, domain
);
786 if (remove
&& obj
->synchronisation
) {
787 void **dislink
= mono_monitor_get_object_monitor_weak_link (obj
);
789 sgen_register_disappearing_link (NULL
, dislink
, FALSE
, TRUE
);
796 clear_domain_process_minor_object_callback (GCObject
*obj
, size_t size
, MonoDomain
*domain
)
798 if (clear_domain_process_object (obj
, domain
)) {
799 CANARIFY_SIZE (size
);
800 memset (obj
, 0, size
);
805 clear_domain_process_major_object_callback (GCObject
*obj
, size_t size
, MonoDomain
*domain
)
807 clear_domain_process_object (obj
, domain
);
811 clear_domain_free_major_non_pinned_object_callback (GCObject
*obj
, size_t size
, MonoDomain
*domain
)
813 if (need_remove_object_for_domain (obj
, domain
))
814 major_collector
.free_non_pinned_object (obj
, size
);
818 clear_domain_free_major_pinned_object_callback (GCObject
*obj
, size_t size
, MonoDomain
*domain
)
820 if (need_remove_object_for_domain (obj
, domain
))
821 major_collector
.free_pinned_object (obj
, size
);
825 * When appdomains are unloaded we can easily remove objects that have finalizers,
826 * but all the others could still be present in random places on the heap.
827 * We need a sweep to get rid of them even though it's going to be costly
829 * The reason we need to remove them is because we access the vtable and class
830 * structures to know the object size and the reference bitmap: once the domain is
831 * unloaded the point to random memory.
834 mono_gc_clear_domain (MonoDomain
* domain
)
836 LOSObject
*bigobj
, *prev
;
841 binary_protocol_domain_unload_begin (domain
);
845 if (sgen_concurrent_collection_in_progress ())
846 sgen_perform_collection (0, GENERATION_OLD
, "clear domain", TRUE
);
847 SGEN_ASSERT (0, !sgen_concurrent_collection_in_progress (), "We just ordered a synchronous collection. Why are we collecting concurrently?");
849 major_collector
.finish_sweeping ();
851 sgen_process_fin_stage_entries ();
852 sgen_process_dislink_stage_entries ();
854 sgen_clear_nursery_fragments ();
856 if (sgen_mono_xdomain_checks
&& domain
!= mono_get_root_domain ()) {
857 sgen_scan_for_registered_roots_in_domain (domain
, ROOT_TYPE_NORMAL
);
858 sgen_scan_for_registered_roots_in_domain (domain
, ROOT_TYPE_WBARRIER
);
859 sgen_check_for_xdomain_refs ();
862 /*Ephemerons and dislinks must be processed before LOS since they might end up pointing
863 to memory returned to the OS.*/
864 null_ephemerons_for_domain (domain
);
866 for (i
= GENERATION_NURSERY
; i
< GENERATION_MAX
; ++i
)
867 sgen_null_links_if (object_in_domain_predicate
, domain
, i
);
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
);
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_print_class_stats ();
907 sgen_object_layout_dump (stdout
);
910 sgen_restart_world (0, NULL
);
912 binary_protocol_domain_unload_end (domain
);
913 binary_protocol_flush_buffers (FALSE
);
922 static gboolean alloc_events
= FALSE
;
925 mono_gc_enable_alloc_events (void)
931 mono_gc_alloc_obj (MonoVTable
*vtable
, size_t size
)
933 MonoObject
*obj
= sgen_alloc_obj (vtable
, size
);
935 if (G_UNLIKELY (alloc_events
))
936 mono_profiler_allocation (obj
);
942 mono_gc_alloc_pinned_obj (MonoVTable
*vtable
, size_t size
)
944 MonoObject
*obj
= sgen_alloc_obj_pinned (vtable
, size
);
946 if (G_UNLIKELY (alloc_events
))
947 mono_profiler_allocation (obj
);
953 mono_gc_alloc_mature (MonoVTable
*vtable
)
955 MonoObject
*obj
= sgen_alloc_obj_mature (vtable
, vtable
->klass
->instance_size
);
957 if (obj
&& G_UNLIKELY (obj
->vtable
->klass
->has_finalize
))
958 mono_object_register_finalizer (obj
);
960 if (G_UNLIKELY (alloc_events
))
961 mono_profiler_allocation (obj
);
967 mono_gc_alloc_fixed (size_t size
, MonoGCDescriptor descr
)
969 /* FIXME: do a single allocation */
970 void *res
= calloc (1, size
);
973 if (!mono_gc_register_root (res
, size
, descr
)) {
981 mono_gc_free_fixed (void* addr
)
983 mono_gc_deregister_root (addr
);
991 static MonoMethod
* alloc_method_cache
[ATYPE_NUM
];
992 static MonoMethod
* slowpath_alloc_method_cache
[ATYPE_NUM
];
993 static gboolean use_managed_allocator
= TRUE
;
995 #ifdef MANAGED_ALLOCATION
997 #ifdef HAVE_KW_THREAD
999 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { \
1000 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1001 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1002 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_TLAB_NEXT_ADDR); \
1005 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { \
1006 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1007 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1008 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_TLAB_TEMP_END); \
1013 #if defined(__APPLE__) || defined (HOST_WIN32)
1014 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { \
1015 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1016 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1017 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1018 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_next_addr)); \
1019 mono_mb_emit_byte ((mb), CEE_ADD); \
1020 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1023 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { \
1024 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1025 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1026 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1027 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_temp_end)); \
1028 mono_mb_emit_byte ((mb), CEE_ADD); \
1029 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1033 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1034 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1039 /* FIXME: Do this in the JIT, where specialized allocation sequences can be created
1040 * for each class. This is currently not easy to do, as it is hard to generate basic
1041 * blocks + branches, but it is easy with the linear IL codebase.
1043 * For this to work we'd need to solve the TLAB race, first. Now we
1044 * require the allocator to be in a few known methods to make sure
1045 * that they are executed atomically via the restart mechanism.
1048 create_allocator (int atype
, gboolean slowpath
)
1050 int p_var
, size_var
;
1051 guint32 slowpath_branch
, max_size_branch
;
1052 MonoMethodBuilder
*mb
;
1054 MonoMethodSignature
*csig
;
1055 static gboolean registered
= FALSE
;
1056 int tlab_next_addr_var
, new_next_var
;
1057 const char *name
= NULL
;
1058 AllocatorWrapperInfo
*info
;
1062 mono_register_jit_icall (mono_gc_alloc_obj
, "mono_gc_alloc_obj", mono_create_icall_signature ("object ptr int"), FALSE
);
1063 mono_register_jit_icall (mono_gc_alloc_vector
, "mono_gc_alloc_vector", mono_create_icall_signature ("object ptr int int"), FALSE
);
1064 mono_register_jit_icall (mono_gc_alloc_string
, "mono_gc_alloc_string", mono_create_icall_signature ("object ptr int int32"), FALSE
);
1068 if (atype
== ATYPE_SMALL
) {
1069 name
= slowpath
? "SlowAllocSmall" : "AllocSmall";
1070 } else if (atype
== ATYPE_NORMAL
) {
1071 name
= slowpath
? "SlowAlloc" : "Alloc";
1072 } else if (atype
== ATYPE_VECTOR
) {
1073 name
= slowpath
? "SlowAllocVector" : "AllocVector";
1074 } else if (atype
== ATYPE_STRING
) {
1075 name
= slowpath
? "SlowAllocString" : "AllocString";
1077 g_assert_not_reached ();
1080 if (atype
== ATYPE_NORMAL
)
1085 csig
= mono_metadata_signature_alloc (mono_defaults
.corlib
, num_params
);
1086 if (atype
== ATYPE_STRING
) {
1087 csig
->ret
= &mono_defaults
.string_class
->byval_arg
;
1088 csig
->params
[0] = &mono_defaults
.int_class
->byval_arg
;
1089 csig
->params
[1] = &mono_defaults
.int32_class
->byval_arg
;
1091 csig
->ret
= &mono_defaults
.object_class
->byval_arg
;
1092 for (i
= 0; i
< num_params
; i
++)
1093 csig
->params
[i
] = &mono_defaults
.int_class
->byval_arg
;
1096 mb
= mono_mb_new (mono_defaults
.object_class
, name
, MONO_WRAPPER_ALLOC
);
1103 mono_mb_emit_ldarg (mb
, 0);
1104 mono_mb_emit_icall (mb
, mono_object_new_specific
);
1107 mono_mb_emit_ldarg (mb
, 0);
1108 mono_mb_emit_ldarg (mb
, 1);
1109 mono_mb_emit_icall (mb
, mono_array_new_specific
);
1112 mono_mb_emit_ldarg (mb
, 1);
1113 mono_mb_emit_icall (mb
, mono_string_alloc
);
1116 g_assert_not_reached ();
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
= 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
, sizeof (MonoArray
));
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_from_name (mono_defaults
.corlib
,
1195 "System", "OverflowException");
1196 g_assert (clause
->data
.catch_class
);
1197 clause
->handler_offset
= mono_mb_get_label (mb
);
1199 oom_exc_class
= mono_class_from_name (mono_defaults
.corlib
,
1200 "System", "OutOfMemoryException");
1201 g_assert (oom_exc_class
);
1202 ctor
= mono_class_get_method_from_name (oom_exc_class
, ".ctor", 0);
1205 mono_mb_emit_byte (mb
, CEE_POP
);
1206 mono_mb_emit_op (mb
, CEE_NEWOBJ
, ctor
);
1207 mono_mb_emit_byte (mb
, CEE_THROW
);
1209 clause
->handler_len
= mono_mb_get_pos (mb
) - clause
->handler_offset
;
1210 mono_mb_set_clauses (mb
, 1, clause
);
1211 mono_mb_patch_branch (mb
, pos_leave
);
1213 } else if (atype
== ATYPE_STRING
) {
1217 * a string allocator method takes the args: (vtable, len)
1219 * bytes = offsetof (MonoString, chars) + ((len + 1) * 2)
1223 * bytes <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1227 * offsetof (MonoString, chars) + ((len + 1) * 2) <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1228 * len <= (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - offsetof (MonoString, chars)) / 2 - 1
1230 mono_mb_emit_ldarg (mb
, 1);
1231 mono_mb_emit_icon (mb
, (INT32_MAX
- (SGEN_ALLOC_ALIGN
- 1) - MONO_STRUCT_OFFSET (MonoString
, chars
)) / 2 - 1);
1232 pos
= mono_mb_emit_short_branch (mb
, MONO_CEE_BLE_UN_S
);
1234 mono_mb_emit_byte (mb
, MONO_CUSTOM_PREFIX
);
1235 mono_mb_emit_byte (mb
, CEE_MONO_NOT_TAKEN
);
1236 mono_mb_emit_exception (mb
, "OutOfMemoryException", NULL
);
1237 mono_mb_patch_short_branch (mb
, pos
);
1239 mono_mb_emit_ldarg (mb
, 1);
1240 mono_mb_emit_icon (mb
, 1);
1241 mono_mb_emit_byte (mb
, MONO_CEE_SHL
);
1242 //WE manually fold the above + 2 here
1243 mono_mb_emit_icon (mb
, MONO_STRUCT_OFFSET (MonoString
, chars
) + 2);
1244 mono_mb_emit_byte (mb
, CEE_ADD
);
1245 mono_mb_emit_stloc (mb
, size_var
);
1247 g_assert_not_reached ();
1250 if (atype
!= ATYPE_SMALL
) {
1251 /* size += ALLOC_ALIGN - 1; */
1252 mono_mb_emit_ldloc (mb
, size_var
);
1253 mono_mb_emit_icon (mb
, SGEN_ALLOC_ALIGN
- 1);
1254 mono_mb_emit_byte (mb
, CEE_ADD
);
1255 /* size &= ~(ALLOC_ALIGN - 1); */
1256 mono_mb_emit_icon (mb
, ~(SGEN_ALLOC_ALIGN
- 1));
1257 mono_mb_emit_byte (mb
, CEE_AND
);
1258 mono_mb_emit_stloc (mb
, size_var
);
1261 /* if (size > MAX_SMALL_OBJ_SIZE) goto slowpath */
1262 if (atype
!= ATYPE_SMALL
) {
1263 mono_mb_emit_ldloc (mb
, size_var
);
1264 mono_mb_emit_icon (mb
, SGEN_MAX_SMALL_OBJ_SIZE
);
1265 max_size_branch
= mono_mb_emit_short_branch (mb
, MONO_CEE_BGT_UN_S
);
1269 * We need to modify tlab_next, but the JIT only supports reading, so we read
1270 * another tls var holding its address instead.
1273 /* tlab_next_addr (local) = tlab_next_addr (TLS var) */
1274 tlab_next_addr_var
= mono_mb_add_local (mb
, &mono_defaults
.int_class
->byval_arg
);
1275 EMIT_TLS_ACCESS_NEXT_ADDR (mb
);
1276 mono_mb_emit_stloc (mb
, tlab_next_addr_var
);
1278 /* p = (void**)tlab_next; */
1279 p_var
= mono_mb_add_local (mb
, &mono_defaults
.int_class
->byval_arg
);
1280 mono_mb_emit_ldloc (mb
, tlab_next_addr_var
);
1281 mono_mb_emit_byte (mb
, CEE_LDIND_I
);
1282 mono_mb_emit_stloc (mb
, p_var
);
1284 /* new_next = (char*)p + size; */
1285 new_next_var
= mono_mb_add_local (mb
, &mono_defaults
.int_class
->byval_arg
);
1286 mono_mb_emit_ldloc (mb
, p_var
);
1287 mono_mb_emit_ldloc (mb
, size_var
);
1288 mono_mb_emit_byte (mb
, CEE_CONV_I
);
1289 mono_mb_emit_byte (mb
, CEE_ADD
);
1290 mono_mb_emit_stloc (mb
, new_next_var
);
1292 /* if (G_LIKELY (new_next < tlab_temp_end)) */
1293 mono_mb_emit_ldloc (mb
, new_next_var
);
1294 EMIT_TLS_ACCESS_TEMP_END (mb
);
1295 slowpath_branch
= mono_mb_emit_short_branch (mb
, MONO_CEE_BLT_UN_S
);
1298 if (atype
!= ATYPE_SMALL
)
1299 mono_mb_patch_short_branch (mb
, max_size_branch
);
1301 mono_mb_emit_byte (mb
, MONO_CUSTOM_PREFIX
);
1302 mono_mb_emit_byte (mb
, CEE_MONO_NOT_TAKEN
);
1304 /* FIXME: mono_gc_alloc_obj takes a 'size_t' as an argument, not an int32 */
1305 mono_mb_emit_ldarg (mb
, 0);
1306 mono_mb_emit_ldloc (mb
, size_var
);
1307 if (atype
== ATYPE_NORMAL
|| atype
== ATYPE_SMALL
) {
1308 mono_mb_emit_icall (mb
, mono_gc_alloc_obj
);
1309 } else if (atype
== ATYPE_VECTOR
) {
1310 mono_mb_emit_ldarg (mb
, 1);
1311 mono_mb_emit_icall (mb
, mono_gc_alloc_vector
);
1312 } else if (atype
== ATYPE_STRING
) {
1313 mono_mb_emit_ldarg (mb
, 1);
1314 mono_mb_emit_icall (mb
, mono_gc_alloc_string
);
1316 g_assert_not_reached ();
1318 mono_mb_emit_byte (mb
, CEE_RET
);
1321 mono_mb_patch_short_branch (mb
, slowpath_branch
);
1323 /* FIXME: Memory barrier */
1325 /* tlab_next = new_next */
1326 mono_mb_emit_ldloc (mb
, tlab_next_addr_var
);
1327 mono_mb_emit_ldloc (mb
, new_next_var
);
1328 mono_mb_emit_byte (mb
, CEE_STIND_I
);
1330 /*The tlab store must be visible before the the vtable store. This could be replaced with a DDS but doing it with IL would be tricky. */
1331 mono_mb_emit_byte (mb
, MONO_CUSTOM_PREFIX
);
1332 mono_mb_emit_byte (mb
, CEE_MONO_MEMORY_BARRIER
);
1333 mono_mb_emit_i4 (mb
, MONO_MEMORY_BARRIER_REL
);
1336 mono_mb_emit_ldloc (mb
, p_var
);
1337 mono_mb_emit_ldarg (mb
, 0);
1338 mono_mb_emit_byte (mb
, CEE_STIND_I
);
1340 if (atype
== ATYPE_VECTOR
) {
1341 /* arr->max_length = max_length; */
1342 mono_mb_emit_ldloc (mb
, p_var
);
1343 mono_mb_emit_ldflda (mb
, MONO_STRUCT_OFFSET (MonoArray
, max_length
));
1344 mono_mb_emit_ldarg (mb
, 1);
1345 #ifdef MONO_BIG_ARRAYS
1346 mono_mb_emit_byte (mb
, CEE_STIND_I
);
1348 mono_mb_emit_byte (mb
, CEE_STIND_I4
);
1350 } else if (atype
== ATYPE_STRING
) {
1351 /* need to set length and clear the last char */
1352 /* s->length = len; */
1353 mono_mb_emit_ldloc (mb
, p_var
);
1354 mono_mb_emit_icon (mb
, MONO_STRUCT_OFFSET (MonoString
, length
));
1355 mono_mb_emit_byte (mb
, MONO_CEE_ADD
);
1356 mono_mb_emit_ldarg (mb
, 1);
1357 mono_mb_emit_byte (mb
, MONO_CEE_STIND_I4
);
1358 /* s->chars [len] = 0; */
1359 mono_mb_emit_ldloc (mb
, p_var
);
1360 mono_mb_emit_ldloc (mb
, size_var
);
1361 mono_mb_emit_icon (mb
, 2);
1362 mono_mb_emit_byte (mb
, MONO_CEE_SUB
);
1363 mono_mb_emit_byte (mb
, MONO_CEE_ADD
);
1364 mono_mb_emit_icon (mb
, 0);
1365 mono_mb_emit_byte (mb
, MONO_CEE_STIND_I2
);
1369 We must make sure both vtable and max_length are globaly visible before returning to managed land.
1371 mono_mb_emit_byte (mb
, MONO_CUSTOM_PREFIX
);
1372 mono_mb_emit_byte (mb
, CEE_MONO_MEMORY_BARRIER
);
1373 mono_mb_emit_i4 (mb
, MONO_MEMORY_BARRIER_REL
);
1376 mono_mb_emit_ldloc (mb
, p_var
);
1379 mono_mb_emit_byte (mb
, CEE_RET
);
1382 res
= mono_mb_create_method (mb
, csig
, 8);
1384 mono_method_get_header (res
)->init_locals
= FALSE
;
1386 info
= mono_image_alloc0 (mono_defaults
.corlib
, sizeof (AllocatorWrapperInfo
));
1387 info
->gc_name
= "sgen";
1388 info
->alloc_type
= atype
;
1389 mono_marshal_set_wrapper_info (res
, info
);
1396 mono_gc_get_aligned_size_for_allocator (int size
)
1398 int aligned_size
= size
;
1399 aligned_size
+= SGEN_ALLOC_ALIGN
- 1;
1400 aligned_size
&= ~(SGEN_ALLOC_ALIGN
- 1);
1401 return aligned_size
;
1405 * Generate an allocator method implementing the fast path of mono_gc_alloc_obj ().
1406 * The signature of the called method is:
1407 * object allocate (MonoVTable *vtable)
1410 mono_gc_get_managed_allocator (MonoClass
*klass
, gboolean for_box
, gboolean known_instance_size
)
1412 #ifdef MANAGED_ALLOCATION
1413 if (collect_before_allocs
)
1415 if (!mono_runtime_has_tls_get ())
1417 if (klass
->instance_size
> tlab_size
)
1419 if (known_instance_size
&& ALIGN_TO (klass
->instance_size
, SGEN_ALLOC_ALIGN
) >= SGEN_MAX_SMALL_OBJ_SIZE
)
1421 if (mono_class_has_finalizer (klass
) || mono_class_is_marshalbyref (klass
) || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS
))
1425 if (klass
->byval_arg
.type
== MONO_TYPE_STRING
)
1426 return mono_gc_get_managed_allocator_by_type (ATYPE_STRING
, FALSE
);
1427 /* Generic classes have dynamic field and can go above MAX_SMALL_OBJ_SIZE. */
1428 if (known_instance_size
)
1429 return mono_gc_get_managed_allocator_by_type (ATYPE_SMALL
, FALSE
);
1431 return mono_gc_get_managed_allocator_by_type (ATYPE_NORMAL
, FALSE
);
1438 mono_gc_get_managed_array_allocator (MonoClass
*klass
)
1440 #ifdef MANAGED_ALLOCATION
1441 if (klass
->rank
!= 1)
1443 if (!mono_runtime_has_tls_get ())
1445 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS
)
1447 if (has_per_allocation_action
)
1449 g_assert (!mono_class_has_finalizer (klass
) && !mono_class_is_marshalbyref (klass
));
1451 return mono_gc_get_managed_allocator_by_type (ATYPE_VECTOR
, FALSE
);
1458 sgen_set_use_managed_allocator (gboolean flag
)
1460 use_managed_allocator
= flag
;
1464 mono_gc_get_managed_allocator_by_type (int atype
, gboolean slowpath
)
1466 #ifdef MANAGED_ALLOCATION
1468 MonoMethod
**cache
= slowpath
? slowpath_alloc_method_cache
: alloc_method_cache
;
1470 if (!use_managed_allocator
)
1473 if (!mono_runtime_has_tls_get ())
1476 res
= cache
[atype
];
1480 res
= create_allocator (atype
, slowpath
);
1482 if (cache
[atype
]) {
1483 mono_free_method (res
);
1484 res
= cache
[atype
];
1486 mono_memory_barrier ();
1487 cache
[atype
] = res
;
1498 mono_gc_get_managed_allocator_types (void)
1504 sgen_is_managed_allocator (MonoMethod
*method
)
1508 for (i
= 0; i
< ATYPE_NUM
; ++i
)
1509 if (method
== alloc_method_cache
[i
] || method
== slowpath_alloc_method_cache
[i
])
1515 sgen_has_managed_allocator (void)
1519 for (i
= 0; i
< ATYPE_NUM
; ++i
)
1520 if (alloc_method_cache
[i
] || slowpath_alloc_method_cache
[i
])
1526 * Cardtable scanning
1529 #define MWORD_MASK (sizeof (mword) - 1)
1532 find_card_offset (mword card
)
1534 /*XXX Use assembly as this generates some pretty bad code */
1535 #if defined(__i386__) && defined(__GNUC__)
1536 return (__builtin_ffs (card
) - 1) / 8;
1537 #elif defined(__x86_64__) && defined(__GNUC__)
1538 return (__builtin_ffsll (card
) - 1) / 8;
1539 #elif defined(__s390x__)
1540 return (__builtin_ffsll (GUINT64_TO_LE(card
)) - 1) / 8;
1543 guint8
*ptr
= (guint8
*) &card
;
1544 for (i
= 0; i
< sizeof (mword
); ++i
) {
1553 find_next_card (guint8
*card_data
, guint8
*end
)
1555 mword
*cards
, *cards_end
;
1558 while ((((mword
)card_data
) & MWORD_MASK
) && card_data
< end
) {
1564 if (card_data
== end
)
1567 cards
= (mword
*)card_data
;
1568 cards_end
= (mword
*)((mword
)end
& ~MWORD_MASK
);
1569 while (cards
< cards_end
) {
1572 return (guint8
*)cards
+ find_card_offset (card
);
1576 card_data
= (guint8
*)cards_end
;
1577 while (card_data
< end
) {
1586 #define ARRAY_OBJ_INDEX(ptr,array,elem_size) (((char*)(ptr) - ((char*)(array) + G_STRUCT_OFFSET (MonoArray, vector))) / (elem_size))
1589 sgen_client_cardtable_scan_object (GCObject
*obj
, mword block_obj_size
, guint8
*cards
, gboolean mod_union
, ScanCopyContext ctx
)
1591 MonoVTable
*vt
= SGEN_LOAD_VTABLE (obj
);
1592 MonoClass
*klass
= vt
->klass
;
1594 SGEN_ASSERT (0, SGEN_VTABLE_HAS_REFERENCES (vt
), "Why would we ever call this on reference-free objects?");
1597 MonoArray
*arr
= (MonoArray
*)obj
;
1598 guint8
*card_data
, *card_base
;
1599 guint8
*card_data_end
;
1600 char *obj_start
= sgen_card_table_align_pointer (obj
);
1602 mword obj_size
= sgen_mono_array_size (vt
, arr
, &bounds_size
, sgen_vtable_get_descriptor (vt
));
1603 /* We don't want to scan the bounds entries at the end of multidimensional arrays */
1604 char *obj_end
= (char*)obj
+ obj_size
- bounds_size
;
1606 size_t extra_idx
= 0;
1608 mword desc
= (mword
)klass
->element_class
->gc_descr
;
1609 int elem_size
= mono_array_element_size (klass
);
1611 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1612 guint8
*overflow_scan_end
= NULL
;
1615 #ifdef SGEN_OBJECT_LAYOUT_STATISTICS
1616 if (klass
->element_class
->valuetype
)
1617 sgen_object_layout_scanned_vtype_array ();
1619 sgen_object_layout_scanned_ref_array ();
1625 card_data
= sgen_card_table_get_card_scan_address ((mword
)obj
);
1627 card_base
= card_data
;
1628 card_count
= sgen_card_table_number_of_cards_in_range ((mword
)obj
, obj_size
);
1629 card_data_end
= card_data
+ card_count
;
1632 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1633 /*Check for overflow and if so, setup to scan in two steps*/
1634 if (!cards
&& card_data_end
>= SGEN_SHADOW_CARDTABLE_END
) {
1635 overflow_scan_end
= sgen_shadow_cardtable
+ (card_data_end
- SGEN_SHADOW_CARDTABLE_END
);
1636 card_data_end
= SGEN_SHADOW_CARDTABLE_END
;
1642 card_data
= find_next_card (card_data
, card_data_end
);
1643 for (; card_data
< card_data_end
; card_data
= find_next_card (card_data
+ 1, card_data_end
)) {
1645 size_t idx
= (card_data
- card_base
) + extra_idx
;
1646 char *start
= (char*)(obj_start
+ idx
* CARD_SIZE_IN_BYTES
);
1647 char *card_end
= start
+ CARD_SIZE_IN_BYTES
;
1648 char *first_elem
, *elem
;
1650 HEAVY_STAT (++los_marked_cards
);
1653 sgen_card_table_prepare_card_for_scanning (card_data
);
1655 card_end
= MIN (card_end
, obj_end
);
1657 if (start
<= (char*)arr
->vector
)
1660 index
= ARRAY_OBJ_INDEX (start
, obj
, elem_size
);
1662 elem
= first_elem
= (char*)mono_array_addr_with_size_fast ((MonoArray
*)obj
, elem_size
, index
);
1663 if (klass
->element_class
->valuetype
) {
1664 ScanVTypeFunc scan_vtype_func
= ctx
.ops
->scan_vtype
;
1666 for (; elem
< card_end
; elem
+= elem_size
)
1667 scan_vtype_func (obj
, elem
, desc
, ctx
.queue
BINARY_PROTOCOL_ARG (elem_size
));
1669 CopyOrMarkObjectFunc copy_func
= ctx
.ops
->copy_or_mark_object
;
1671 HEAVY_STAT (++los_array_cards
);
1672 for (; elem
< card_end
; elem
+= SIZEOF_VOID_P
) {
1673 gpointer
new, old
= *(gpointer
*)elem
;
1674 if ((mod_union
&& old
) || G_UNLIKELY (sgen_ptr_in_nursery (old
))) {
1675 HEAVY_STAT (++los_array_remsets
);
1676 copy_func ((GCObject
**)elem
, ctx
.queue
);
1677 new = *(gpointer
*)elem
;
1678 if (G_UNLIKELY (sgen_ptr_in_nursery (new)))
1679 sgen_add_to_global_remset (elem
, new);
1684 binary_protocol_card_scan (first_elem
, elem
- first_elem
);
1687 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1688 if (overflow_scan_end
) {
1689 extra_idx
= card_data
- card_base
;
1690 card_base
= card_data
= sgen_shadow_cardtable
;
1691 card_data_end
= overflow_scan_end
;
1692 overflow_scan_end
= NULL
;
1703 * Array and string allocation
1707 mono_gc_alloc_vector (MonoVTable
*vtable
, size_t size
, uintptr_t max_length
)
1712 if (!SGEN_CAN_ALIGN_UP (size
))
1715 #ifndef DISABLE_CRITICAL_REGION
1716 ENTER_CRITICAL_REGION
;
1717 arr
= (MonoArray
*)sgen_try_alloc_obj_nolock (vtable
, size
);
1719 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1720 arr
->max_length
= (mono_array_size_t
)max_length
;
1721 EXIT_CRITICAL_REGION
;
1724 EXIT_CRITICAL_REGION
;
1729 arr
= (MonoArray
*)sgen_alloc_obj_nolock (vtable
, size
);
1730 if (G_UNLIKELY (!arr
)) {
1732 return mono_gc_out_of_memory (size
);
1735 arr
->max_length
= (mono_array_size_t
)max_length
;
1740 if (G_UNLIKELY (alloc_events
))
1741 mono_profiler_allocation (&arr
->obj
);
1743 SGEN_ASSERT (6, SGEN_ALIGN_UP (size
) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable
, (GCObject
*)arr
)), "Vector has incorrect size.");
1748 mono_gc_alloc_array (MonoVTable
*vtable
, size_t size
, uintptr_t max_length
, uintptr_t bounds_size
)
1751 MonoArrayBounds
*bounds
;
1754 if (!SGEN_CAN_ALIGN_UP (size
))
1757 #ifndef DISABLE_CRITICAL_REGION
1758 ENTER_CRITICAL_REGION
;
1759 arr
= (MonoArray
*)sgen_try_alloc_obj_nolock (vtable
, size
);
1761 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1762 arr
->max_length
= (mono_array_size_t
)max_length
;
1764 bounds
= (MonoArrayBounds
*)((char*)arr
+ size
- bounds_size
);
1765 arr
->bounds
= bounds
;
1766 EXIT_CRITICAL_REGION
;
1769 EXIT_CRITICAL_REGION
;
1774 arr
= (MonoArray
*)sgen_alloc_obj_nolock (vtable
, size
);
1775 if (G_UNLIKELY (!arr
)) {
1777 return mono_gc_out_of_memory (size
);
1780 arr
->max_length
= (mono_array_size_t
)max_length
;
1782 bounds
= (MonoArrayBounds
*)((char*)arr
+ size
- bounds_size
);
1783 arr
->bounds
= bounds
;
1788 if (G_UNLIKELY (alloc_events
))
1789 mono_profiler_allocation (&arr
->obj
);
1791 SGEN_ASSERT (6, SGEN_ALIGN_UP (size
) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable
, (GCObject
*)arr
)), "Array has incorrect size.");
1796 mono_gc_alloc_string (MonoVTable
*vtable
, size_t size
, gint32 len
)
1801 if (!SGEN_CAN_ALIGN_UP (size
))
1804 #ifndef DISABLE_CRITICAL_REGION
1805 ENTER_CRITICAL_REGION
;
1806 str
= (MonoString
*)sgen_try_alloc_obj_nolock (vtable
, size
);
1808 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1810 EXIT_CRITICAL_REGION
;
1813 EXIT_CRITICAL_REGION
;
1818 str
= (MonoString
*)sgen_alloc_obj_nolock (vtable
, size
);
1819 if (G_UNLIKELY (!str
)) {
1821 return mono_gc_out_of_memory (size
);
1829 if (G_UNLIKELY (alloc_events
))
1830 mono_profiler_allocation (&str
->object
);
1840 mono_gc_set_string_length (MonoString
*str
, gint32 new_length
)
1842 mono_unichar2
*new_end
= str
->chars
+ new_length
;
1844 /* zero the discarded string. This null-delimits the string and allows
1845 * the space to be reclaimed by SGen. */
1847 if (nursery_canaries_enabled () && sgen_ptr_in_nursery (str
)) {
1848 CHECK_CANARY_FOR_OBJECT ((GCObject
*)str
);
1849 memset (new_end
, 0, (str
->length
- new_length
+ 1) * sizeof (mono_unichar2
) + CANARY_SIZE
);
1850 memcpy (new_end
+ 1 , CANARY_STRING
, CANARY_SIZE
);
1852 memset (new_end
, 0, (str
->length
- new_length
+ 1) * sizeof (mono_unichar2
));
1855 str
->length
= new_length
;
1862 #define GC_ROOT_NUM 32
1864 int count
; /* must be the first field */
1865 void *objects
[GC_ROOT_NUM
];
1866 int root_types
[GC_ROOT_NUM
];
1867 uintptr_t extra_info
[GC_ROOT_NUM
];
1871 notify_gc_roots (GCRootReport
*report
)
1875 mono_profiler_gc_roots (report
->count
, report
->objects
, report
->root_types
, report
->extra_info
);
1880 add_profile_gc_root (GCRootReport
*report
, void *object
, int rtype
, uintptr_t extra_info
)
1882 if (report
->count
== GC_ROOT_NUM
)
1883 notify_gc_roots (report
);
1884 report
->objects
[report
->count
] = object
;
1885 report
->root_types
[report
->count
] = rtype
;
1886 report
->extra_info
[report
->count
++] = (uintptr_t)SGEN_LOAD_VTABLE (object
)->klass
;
1890 sgen_client_nursery_objects_pinned (void **definitely_pinned
, int count
)
1892 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS
) {
1893 GCRootReport report
;
1896 for (idx
= 0; idx
< count
; ++idx
)
1897 add_profile_gc_root (&report
, definitely_pinned
[idx
], MONO_PROFILE_GC_ROOT_PINNING
| MONO_PROFILE_GC_ROOT_MISC
, 0);
1898 notify_gc_roots (&report
);
1903 report_finalizer_roots_from_queue (SgenPointerQueue
*queue
)
1905 GCRootReport report
;
1909 for (i
= 0; i
< queue
->next_slot
; ++i
) {
1910 void *obj
= queue
->data
[i
];
1913 add_profile_gc_root (&report
, obj
, MONO_PROFILE_GC_ROOT_FINALIZER
, 0);
1915 notify_gc_roots (&report
);
1919 report_finalizer_roots (SgenPointerQueue
*fin_ready_queue
, SgenPointerQueue
*critical_fin_queue
)
1921 report_finalizer_roots_from_queue (fin_ready_queue
);
1922 report_finalizer_roots_from_queue (critical_fin_queue
);
1925 static GCRootReport
*root_report
;
1928 single_arg_report_root (MonoObject
**obj
, void *gc_data
)
1931 add_profile_gc_root (root_report
, *obj
, MONO_PROFILE_GC_ROOT_OTHER
, 0);
1935 precisely_report_roots_from (GCRootReport
*report
, void** start_root
, void** end_root
, mword desc
)
1937 switch (desc
& ROOT_DESC_TYPE_MASK
) {
1938 case ROOT_DESC_BITMAP
:
1939 desc
>>= ROOT_DESC_TYPE_SHIFT
;
1941 if ((desc
& 1) && *start_root
) {
1942 add_profile_gc_root (report
, *start_root
, MONO_PROFILE_GC_ROOT_OTHER
, 0);
1948 case ROOT_DESC_COMPLEX
: {
1949 gsize
*bitmap_data
= sgen_get_complex_descriptor_bitmap (desc
);
1950 gsize bwords
= (*bitmap_data
) - 1;
1951 void **start_run
= start_root
;
1953 while (bwords
-- > 0) {
1954 gsize bmap
= *bitmap_data
++;
1955 void **objptr
= start_run
;
1957 if ((bmap
& 1) && *objptr
) {
1958 add_profile_gc_root (report
, *objptr
, MONO_PROFILE_GC_ROOT_OTHER
, 0);
1963 start_run
+= GC_BITS_PER_WORD
;
1967 case ROOT_DESC_USER
: {
1968 MonoGCRootMarkFunc marker
= (MonoGCRootMarkFunc
)sgen_get_user_descriptor_func (desc
);
1969 root_report
= report
;
1970 marker ((MonoObject
**)start_root
, single_arg_report_root
, NULL
);
1973 case ROOT_DESC_RUN_LEN
:
1974 g_assert_not_reached ();
1976 g_assert_not_reached ();
1981 report_registered_roots_by_type (int root_type
)
1983 GCRootReport report
;
1987 SGEN_HASH_TABLE_FOREACH (&roots_hash
[root_type
], start_root
, root
) {
1988 SGEN_LOG (6, "Precise root scan %p-%p (desc: %p)", start_root
, root
->end_root
, (void*)root
->root_desc
);
1989 precisely_report_roots_from (&report
, start_root
, (void**)root
->end_root
, root
->root_desc
);
1990 } SGEN_HASH_TABLE_FOREACH_END
;
1991 notify_gc_roots (&report
);
1995 report_registered_roots (void)
1997 report_registered_roots_by_type (ROOT_TYPE_NORMAL
);
1998 report_registered_roots_by_type (ROOT_TYPE_WBARRIER
);
2002 sgen_client_collecting_minor (SgenPointerQueue
*fin_ready_queue
, SgenPointerQueue
*critical_fin_queue
)
2004 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS
)
2005 report_registered_roots ();
2006 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS
)
2007 report_finalizer_roots (fin_ready_queue
, critical_fin_queue
);
2010 static GCRootReport major_root_report
;
2011 static gboolean profile_roots
;
2014 sgen_client_collecting_major_1 (void)
2016 profile_roots
= mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS
;
2017 memset (&major_root_report
, 0, sizeof (GCRootReport
));
2021 sgen_client_pinned_los_object (GCObject
*obj
)
2024 add_profile_gc_root (&major_root_report
, (char*)obj
, MONO_PROFILE_GC_ROOT_PINNING
| MONO_PROFILE_GC_ROOT_MISC
, 0);
2028 sgen_client_collecting_major_2 (void)
2031 notify_gc_roots (&major_root_report
);
2033 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS
)
2034 report_registered_roots ();
2038 sgen_client_collecting_major_3 (SgenPointerQueue
*fin_ready_queue
, SgenPointerQueue
*critical_fin_queue
)
2040 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS
)
2041 report_finalizer_roots (fin_ready_queue
, critical_fin_queue
);
2044 #define MOVED_OBJECTS_NUM 64
2045 static void *moved_objects
[MOVED_OBJECTS_NUM
];
2046 static int moved_objects_idx
= 0;
2049 mono_sgen_register_moved_object (void *obj
, void *destination
)
2051 g_assert (mono_profiler_events
& MONO_PROFILE_GC_MOVES
);
2053 if (moved_objects_idx
== MOVED_OBJECTS_NUM
) {
2054 mono_profiler_gc_moves (moved_objects
, moved_objects_idx
);
2055 moved_objects_idx
= 0;
2057 moved_objects
[moved_objects_idx
++] = obj
;
2058 moved_objects
[moved_objects_idx
++] = destination
;
2062 mono_sgen_gc_event_moves (void)
2064 if (moved_objects_idx
) {
2065 mono_profiler_gc_moves (moved_objects
, moved_objects_idx
);
2066 moved_objects_idx
= 0;
2074 #define REFS_SIZE 128
2077 MonoGCReferences callback
;
2081 MonoObject
*refs
[REFS_SIZE
];
2082 uintptr_t offsets
[REFS_SIZE
];
2086 #define HANDLE_PTR(ptr,obj) do { \
2088 if (hwi->count == REFS_SIZE) { \
2089 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data); \
2093 hwi->offsets [hwi->count] = (char*)(ptr)-(char*)start; \
2094 hwi->refs [hwi->count++] = *(ptr); \
2099 collect_references (HeapWalkInfo
*hwi
, GCObject
*obj
, size_t size
)
2101 char *start
= (char*)obj
;
2102 mword desc
= sgen_obj_get_descriptor (obj
);
2104 #include "sgen/sgen-scan-object.h"
2108 walk_references (GCObject
*start
, size_t size
, void *data
)
2110 HeapWalkInfo
*hwi
= data
;
2113 collect_references (hwi
, start
, size
);
2114 if (hwi
->count
|| !hwi
->called
)
2115 hwi
->callback (start
, mono_object_class (start
), hwi
->called
? 0: size
, hwi
->count
, hwi
->refs
, hwi
->offsets
, hwi
->data
);
2119 * mono_gc_walk_heap:
2120 * @flags: flags for future use
2121 * @callback: a function pointer called for each object in the heap
2122 * @data: a user data pointer that is passed to callback
2124 * This function can be used to iterate over all the live objects in the heap:
2125 * for each object, @callback is invoked, providing info about the object's
2126 * location in memory, its class, its size and the objects it references.
2127 * For each referenced object it's offset from the object address is
2128 * reported in the offsets array.
2129 * The object references may be buffered, so the callback may be invoked
2130 * multiple times for the same object: in all but the first call, the size
2131 * argument will be zero.
2132 * Note that this function can be only called in the #MONO_GC_EVENT_PRE_START_WORLD
2133 * profiler event handler.
2135 * Returns: a non-zero value if the GC doesn't support heap walking
2138 mono_gc_walk_heap (int flags
, MonoGCReferences callback
, void *data
)
2143 hwi
.callback
= callback
;
2146 sgen_clear_nursery_fragments ();
2147 sgen_scan_area_with_callback (nursery_section
->data
, nursery_section
->end_data
, walk_references
, &hwi
, FALSE
);
2149 major_collector
.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL
, walk_references
, &hwi
);
2150 sgen_los_iterate_objects (walk_references
, &hwi
);
2160 mono_gc_set_gc_callbacks (MonoGCCallbacks
*callbacks
)
2162 gc_callbacks
= *callbacks
;
2166 mono_gc_get_gc_callbacks ()
2168 return &gc_callbacks
;
2172 sgen_client_thread_register (SgenThreadInfo
* info
, void *stack_bottom_fallback
)
2175 guint8
*staddr
= NULL
;
2177 #ifndef HAVE_KW_THREAD
2178 g_assert (!mono_native_tls_get_value (thread_info_key
));
2179 mono_native_tls_set_value (thread_info_key
, info
);
2181 sgen_thread_info
= info
;
2184 info
->client_info
.skip
= 0;
2185 info
->client_info
.stopped_ip
= NULL
;
2186 info
->client_info
.stopped_domain
= NULL
;
2188 info
->client_info
.stack_start
= NULL
;
2190 #ifdef SGEN_POSIX_STW
2191 info
->client_info
.stop_count
= -1;
2192 info
->client_info
.signal
= 0;
2195 /* On win32, stack_start_limit should be 0, since the stack can grow dynamically */
2196 mono_thread_info_get_stack_bounds (&staddr
, &stsize
);
2199 info
->client_info
.stack_start_limit
= staddr
;
2201 info
->client_info
.stack_end
= staddr
+ stsize
;
2203 gsize stack_bottom
= (gsize
)stack_bottom_fallback
;
2204 stack_bottom
+= 4095;
2205 stack_bottom
&= ~4095;
2206 info
->client_info
.stack_end
= (char*)stack_bottom
;
2210 memset (&info
->client_info
.ctx
, 0, sizeof (MonoContext
));
2212 memset (&info
->client_info
.regs
, 0, sizeof (info
->client_info
.regs
));
2215 if (mono_gc_get_gc_callbacks ()->thread_attach_func
)
2216 info
->client_info
.runtime_data
= mono_gc_get_gc_callbacks ()->thread_attach_func ();
2218 binary_protocol_thread_register ((gpointer
)mono_thread_info_get_tid (info
));
2220 SGEN_LOG (3, "registered thread %p (%p) stack end %p", info
, (gpointer
)mono_thread_info_get_tid (info
), info
->client_info
.stack_end
);
2224 sgen_client_thread_unregister (SgenThreadInfo
*p
)
2226 MonoNativeThreadId tid
;
2228 #ifndef HAVE_KW_THREAD
2229 mono_native_tls_set_value (thread_info_key
, NULL
);
2231 sgen_thread_info
= NULL
;
2234 tid
= mono_thread_info_get_tid (p
);
2236 if (p
->client_info
.info
.runtime_thread
)
2237 mono_threads_add_joinable_thread ((gpointer
)tid
);
2239 if (mono_gc_get_gc_callbacks ()->thread_detach_func
) {
2240 mono_gc_get_gc_callbacks ()->thread_detach_func (p
->client_info
.runtime_data
);
2241 p
->client_info
.runtime_data
= NULL
;
2244 binary_protocol_thread_unregister ((gpointer
)tid
);
2245 SGEN_LOG (3, "unregister thread %p (%p)", p
, (gpointer
)tid
);
2249 mono_gc_set_skip_thread (gboolean skip
)
2251 SgenThreadInfo
*info
= mono_thread_info_current ();
2254 info
->client_info
.gc_disabled
= skip
;
2259 is_critical_method (MonoMethod
*method
)
2261 return mono_runtime_is_critical_method (method
) || sgen_is_critical_method (method
);
2265 thread_in_critical_region (SgenThreadInfo
*info
)
2267 return info
->client_info
.in_critical_region
;
2271 sgen_thread_attach (SgenThreadInfo
*info
)
2273 if (mono_gc_get_gc_callbacks ()->thread_attach_func
&& !info
->client_info
.runtime_data
)
2274 info
->client_info
.runtime_data
= mono_gc_get_gc_callbacks ()->thread_attach_func ();
2278 sgen_thread_detach (SgenThreadInfo
*p
)
2280 /* If a delegate is passed to native code and invoked on a thread we dont
2281 * know about, the jit will register it with mono_jit_thread_attach, but
2282 * we have no way of knowing when that thread goes away. SGen has a TSD
2283 * so we assume that if the domain is still registered, we can detach
2286 if (mono_domain_get ())
2287 mono_thread_detach_internal (mono_thread_internal_current ());
2291 mono_gc_register_thread (void *baseptr
)
2293 return mono_thread_info_attach (baseptr
) != NULL
;
2297 mono_gc_is_gc_thread (void)
2301 result
= mono_thread_info_current () != NULL
;
2307 sgen_client_thread_register_worker (void)
2309 mono_thread_info_register_small_id ();
2312 /* Variables holding start/end nursery so it won't have to be passed at every call */
2313 static void *scan_area_arg_start
, *scan_area_arg_end
;
2316 mono_gc_conservatively_scan_area (void *start
, void *end
)
2318 sgen_conservatively_pin_objects_from (start
, end
, scan_area_arg_start
, scan_area_arg_end
, PIN_TYPE_STACK
);
2322 mono_gc_scan_object (void *obj
, void *gc_data
)
2324 ScanCopyContext
*ctx
= gc_data
;
2325 ctx
->ops
->copy_or_mark_object ((GCObject
**)&obj
, ctx
->queue
);
2330 * Mark from thread stacks and registers.
2333 sgen_client_scan_thread_data (void *start_nursery
, void *end_nursery
, gboolean precise
, ScanCopyContext ctx
)
2335 SgenThreadInfo
*info
;
2337 scan_area_arg_start
= start_nursery
;
2338 scan_area_arg_end
= end_nursery
;
2340 FOREACH_THREAD (info
) {
2341 int skip_reason
= 0;
2342 if (info
->client_info
.skip
) {
2343 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
);
2345 } else if (info
->client_info
.gc_disabled
) {
2346 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
);
2348 } else if (!mono_thread_info_is_live (info
)) {
2349 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
);
2353 binary_protocol_scan_stack ((gpointer
)mono_thread_info_get_tid (info
), info
->client_info
.stack_start
, info
->client_info
.stack_end
, skip_reason
);
2358 g_assert (info
->client_info
.suspend_done
);
2359 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 ());
2360 if (mono_gc_get_gc_callbacks ()->thread_mark_func
&& !conservative_stack_mark
) {
2361 mono_gc_get_gc_callbacks ()->thread_mark_func (info
->client_info
.runtime_data
, info
->client_info
.stack_start
, info
->client_info
.stack_end
, precise
, &ctx
);
2362 } else if (!precise
) {
2363 if (!conservative_stack_mark
) {
2364 fprintf (stderr
, "Precise stack mark not supported - disabling.\n");
2365 conservative_stack_mark
= TRUE
;
2367 sgen_conservatively_pin_objects_from (info
->client_info
.stack_start
, info
->client_info
.stack_end
, start_nursery
, end_nursery
, PIN_TYPE_STACK
);
2372 sgen_conservatively_pin_objects_from ((void**)&info
->client_info
.ctx
, (void**)&info
->client_info
.ctx
+ ARCH_NUM_REGS
,
2373 start_nursery
, end_nursery
, PIN_TYPE_STACK
);
2375 sgen_conservatively_pin_objects_from ((void**)&info
->client_info
.regs
, (void**)&info
->client_info
.regs
+ ARCH_NUM_REGS
,
2376 start_nursery
, end_nursery
, PIN_TYPE_STACK
);
2379 } END_FOREACH_THREAD
2383 * mono_gc_set_stack_end:
2385 * Set the end of the current threads stack to STACK_END. The stack space between
2386 * STACK_END and the real end of the threads stack will not be scanned during collections.
2389 mono_gc_set_stack_end (void *stack_end
)
2391 SgenThreadInfo
*info
;
2394 info
= mono_thread_info_current ();
2396 SGEN_ASSERT (0, stack_end
< info
->client_info
.stack_end
, "Can only lower stack end");
2397 info
->client_info
.stack_end
= stack_end
;
2407 mono_gc_register_root (char *start
, size_t size
, MonoGCDescriptor descr
)
2409 return sgen_register_root (start
, size
, descr
, descr
? ROOT_TYPE_NORMAL
: ROOT_TYPE_PINNED
);
2413 mono_gc_register_root_wbarrier (char *start
, size_t size
, MonoGCDescriptor descr
)
2415 return sgen_register_root (start
, size
, descr
, ROOT_TYPE_WBARRIER
);
2419 mono_gc_deregister_root (char* addr
)
2421 sgen_deregister_root (addr
);
2430 mono_gc_pthread_create (pthread_t
*new_thread
, const pthread_attr_t
*attr
, void *(*start_routine
)(void *), void *arg
)
2432 return pthread_create (new_thread
, attr
, start_routine
, arg
);
2441 sgen_client_total_allocated_heap_changed (size_t allocated_heap
)
2443 mono_runtime_resource_check_limit (MONO_RESOURCE_GC_HEAP
, allocated_heap
);
2447 mono_gc_user_markers_supported (void)
2453 mono_object_is_alive (MonoObject
* o
)
2459 mono_gc_get_generation (MonoObject
*obj
)
2461 if (sgen_ptr_in_nursery (obj
))
2467 mono_gc_enable_events (void)
2472 mono_gc_get_gc_name (void)
2478 mono_gc_get_description (void)
2480 return g_strdup ("sgen");
2484 mono_gc_set_desktop_mode (void)
2489 mono_gc_is_moving (void)
2495 mono_gc_is_disabled (void)
2501 BOOL APIENTRY
mono_gc_dllmain (HMODULE module_handle
, DWORD reason
, LPVOID reserved
)
2508 mono_gc_max_generation (void)
2514 mono_gc_precise_stack_mark_enabled (void)
2516 return !conservative_stack_mark
;
2520 mono_gc_collect (int generation
)
2522 sgen_gc_collect (generation
);
2526 mono_gc_collection_count (int generation
)
2528 return sgen_gc_collection_count (generation
);
2532 mono_gc_get_used_size (void)
2534 return (int64_t)sgen_gc_get_used_size ();
2538 mono_gc_get_heap_size (void)
2540 return (int64_t)sgen_gc_get_total_heap_allocation ();
2544 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker
)
2546 return sgen_make_user_root_descriptor (marker
);
2550 mono_gc_make_descr_for_string (gsize
*bitmap
, int numbits
)
2552 return SGEN_DESC_STRING
;
2556 mono_gc_get_nursery (int *shift_bits
, size_t *size
)
2558 *size
= sgen_nursery_size
;
2559 *shift_bits
= DEFAULT_NURSERY_BITS
;
2560 return sgen_get_nursery_start ();
2564 mono_gc_get_los_limit (void)
2566 return SGEN_MAX_SMALL_OBJ_SIZE
;
2570 mono_gc_weak_link_add (void **link_addr
, MonoObject
*obj
, gboolean track
)
2572 sgen_register_disappearing_link (obj
, link_addr
, track
, FALSE
);
2576 mono_gc_weak_link_remove (void **link_addr
, gboolean track
)
2578 sgen_register_disappearing_link (NULL
, link_addr
, track
, FALSE
);
2582 mono_gc_weak_link_get (void **link_addr
)
2584 return sgen_weak_link_get (link_addr
);
2588 mono_gc_set_allow_synchronous_major (gboolean flag
)
2590 return sgen_set_allow_synchronous_major (flag
);
2594 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func
, void *data
)
2598 result
= func (data
);
2599 UNLOCK_INTERRUPTION
;
2604 mono_gc_register_altstack (gpointer stack
, gint32 stack_size
, gpointer altstack
, gint32 altstack_size
)
2610 sgen_client_out_of_memory (size_t size
)
2612 mono_gc_out_of_memory (size
);
2616 mono_gc_get_card_table (int *shift_bits
, gpointer
*mask
)
2618 return sgen_get_card_table_configuration (shift_bits
, mask
);
2622 mono_gc_card_table_nursery_check (void)
2624 return !sgen_get_major_collector ()->is_concurrent
;
2627 /* Negative value to remove */
2629 mono_gc_add_memory_pressure (gint64 value
)
2631 /* FIXME: Implement at some point? */
2639 sgen_client_degraded_allocation (size_t size
)
2641 static int last_major_gc_warned
= -1;
2642 static int num_degraded
= 0;
2644 if (last_major_gc_warned
< gc_stats
.major_gc_count
) {
2646 if (num_degraded
== 1 || num_degraded
== 3)
2647 mono_trace (G_LOG_LEVEL_INFO
, MONO_TRACE_GC
, "Warning: Degraded allocation. Consider increasing nursery-size if the warning persists.");
2648 else if (num_degraded
== 10)
2649 mono_trace (G_LOG_LEVEL_INFO
, MONO_TRACE_GC
, "Warning: Repeated degraded allocation. Consider increasing nursery-size.");
2650 last_major_gc_warned
= gc_stats
.major_gc_count
;
2655 sgen_client_log_timing (GGTimingInfo
*info
, mword last_major_num_sections
, mword last_los_memory_usage
)
2657 SgenMajorCollector
*major_collector
= sgen_get_major_collector ();
2658 mword num_major_sections
= major_collector
->get_num_major_sections ();
2659 char full_timing_buff
[1024];
2660 full_timing_buff
[0] = '\0';
2662 if (!info
->is_overflow
)
2663 sprintf (full_timing_buff
, "total %.2fms, bridge %.2fms", info
->stw_time
/ 10000.0f
, (int)info
->bridge_time
/ 10000.0f
);
2664 if (info
->generation
== GENERATION_OLD
)
2665 mono_trace (G_LOG_LEVEL_INFO
, MONO_TRACE_GC
, "GC_MAJOR%s: (%s) pause %.2fms, %s major %dK/%dK los %dK/%dK",
2666 info
->is_overflow
? "_OVERFLOW" : "",
2667 info
->reason
? info
->reason
: "",
2668 (int)info
->total_time
/ 10000.0f
,
2670 major_collector
->section_size
* num_major_sections
/ 1024,
2671 major_collector
->section_size
* last_major_num_sections
/ 1024,
2672 los_memory_usage
/ 1024,
2673 last_los_memory_usage
/ 1024);
2675 mono_trace (G_LOG_LEVEL_INFO
, MONO_TRACE_GC
, "GC_MINOR%s: (%s) pause %.2fms, %s promoted %dK major %dK los %dK",
2676 info
->is_overflow
? "_OVERFLOW" : "",
2677 info
->reason
? info
->reason
: "",
2678 (int)info
->total_time
/ 10000.0f
,
2680 (num_major_sections
- last_major_num_sections
) * major_collector
->section_size
/ 1024,
2681 major_collector
->section_size
* num_major_sections
/ 1024,
2682 los_memory_usage
/ 1024);
2690 sgen_client_description_for_internal_mem_type (int type
)
2693 case INTERNAL_MEM_EPHEMERON_LINK
: return "ephemeron-link";
2700 sgen_client_pre_collection_checks (void)
2702 if (sgen_mono_xdomain_checks
) {
2703 sgen_clear_nursery_fragments ();
2704 sgen_check_for_xdomain_refs ();
2709 sgen_client_vtable_is_inited (MonoVTable
*vt
)
2711 return vt
->klass
->inited
;
2715 sgen_client_vtable_get_namespace (MonoVTable
*vt
)
2717 return vt
->klass
->name_space
;
2721 sgen_client_vtable_get_name (MonoVTable
*vt
)
2723 return vt
->klass
->name
;
2731 sgen_client_init (void)
2734 MonoThreadInfoCallbacks cb
;
2736 cb
.thread_register
= sgen_thread_register
;
2737 cb
.thread_detach
= sgen_thread_detach
;
2738 cb
.thread_unregister
= sgen_thread_unregister
;
2739 cb
.thread_attach
= sgen_thread_attach
;
2740 cb
.mono_method_is_critical
= (gpointer
)is_critical_method
;
2741 cb
.mono_thread_in_critical_region
= thread_in_critical_region
;
2743 mono_threads_init (&cb
, sizeof (SgenThreadInfo
));
2745 ///* Keep this the default for now */
2746 /* Precise marking is broken on all supported targets. Disable until fixed. */
2747 conservative_stack_mark
= TRUE
;
2749 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_EPHEMERON_LINK
, sizeof (EphemeronLinkNode
));
2751 mono_sgen_init_stw ();
2753 #ifndef HAVE_KW_THREAD
2754 mono_native_tls_alloc (&thread_info_key
, NULL
);
2755 #if defined(__APPLE__) || defined (HOST_WIN32)
2757 * CEE_MONO_TLS requires the tls offset, not the key, so the code below only works on darwin,
2758 * where the two are the same.
2760 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO
, thread_info_key
);
2764 int tls_offset
= -1;
2765 MONO_THREAD_VAR_OFFSET (sgen_thread_info
, tls_offset
);
2766 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO
, tls_offset
);
2771 * This needs to happen before any internal allocations because
2772 * it inits the small id which is required for hazard pointer
2777 mono_gc_register_thread (&dummy
);
2781 sgen_client_handle_gc_param (const char *opt
)
2783 if (g_str_has_prefix (opt
, "stack-mark=")) {
2784 opt
= strchr (opt
, '=') + 1;
2785 if (!strcmp (opt
, "precise")) {
2786 conservative_stack_mark
= FALSE
;
2787 } else if (!strcmp (opt
, "conservative")) {
2788 conservative_stack_mark
= TRUE
;
2790 sgen_env_var_error (MONO_GC_PARAMS_NAME
, conservative_stack_mark
? "Using `conservative`." : "Using `precise`.",
2791 "Invalid value `%s` for `stack-mark` option, possible values are: `precise`, `conservative`.", opt
);
2793 } else if (g_str_has_prefix (opt
, "bridge-implementation=")) {
2794 opt
= strchr (opt
, '=') + 1;
2795 sgen_set_bridge_implementation (opt
);
2796 } else if (g_str_has_prefix (opt
, "toggleref-test")) {
2797 /* FIXME: This should probably in MONO_GC_DEBUG */
2798 sgen_register_test_toggleref_callback ();
2806 sgen_client_print_gc_params_usage (void)
2808 fprintf (stderr
, " stack-mark=MARK-METHOD (where MARK-METHOD is 'precise' or 'conservative')\n");
2812 sgen_client_handle_gc_debug (const char *opt
)
2814 if (!strcmp (opt
, "xdomain-checks")) {
2815 sgen_mono_xdomain_checks
= TRUE
;
2816 } else if (!strcmp (opt
, "do-not-finalize")) {
2817 do_not_finalize
= TRUE
;
2818 } else if (!strcmp (opt
, "log-finalizers")) {
2819 log_finalizers
= TRUE
;
2820 } else if (!strcmp (opt
, "no-managed-allocator")) {
2821 sgen_set_use_managed_allocator (FALSE
);
2822 } else if (!sgen_bridge_handle_gc_debug (opt
)) {
2829 sgen_client_print_gc_debug_usage (void)
2831 fprintf (stderr
, " xdomain-checks\n");
2832 fprintf (stderr
, " do-not-finalize\n");
2833 fprintf (stderr
, " log-finalizers\n");
2834 fprintf (stderr
, " no-managed-allocator\n");
2835 sgen_bridge_print_gc_debug_usage ();
2840 sgen_client_get_provenance (void)
2842 #ifdef SGEN_OBJECT_PROVENANCE
2843 MonoGCCallbacks
*cb
= mono_gc_get_gc_callbacks ();
2844 gpointer (*get_provenance_func
) (void);
2847 get_provenance_func
= cb
->get_provenance_func
;
2848 if (get_provenance_func
)
2849 return get_provenance_func ();
2857 sgen_client_describe_invalid_pointer (GCObject
*ptr
)
2859 sgen_bridge_describe_pointer (ptr
);
2863 mono_gc_base_init (void)
2865 mono_counters_init ();
2867 #ifdef HEAVY_STATISTICS
2868 mono_counters_register ("los marked cards", MONO_COUNTER_GC
| MONO_COUNTER_ULONG
, &los_marked_cards
);
2869 mono_counters_register ("los array cards scanned ", MONO_COUNTER_GC
| MONO_COUNTER_ULONG
, &los_array_cards
);
2870 mono_counters_register ("los array remsets", MONO_COUNTER_GC
| MONO_COUNTER_ULONG
, &los_array_remsets
);
2872 mono_counters_register ("WBarrier set arrayref", MONO_COUNTER_GC
| MONO_COUNTER_ULONG
, &stat_wbarrier_set_arrayref
);
2873 mono_counters_register ("WBarrier value copy", MONO_COUNTER_GC
| MONO_COUNTER_ULONG
, &stat_wbarrier_value_copy
);
2874 mono_counters_register ("WBarrier object copy", MONO_COUNTER_GC
| MONO_COUNTER_ULONG
, &stat_wbarrier_object_copy
);
2879 if (nursery_canaries_enabled ())
2880 sgen_set_use_managed_allocator (FALSE
);
2884 mono_gc_base_cleanup (void)
2889 mono_gc_is_null (void)