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-internals.h"
36 #include "metadata/gc-internals.h"
37 #include "utils/mono-memory-model.h"
38 #include "utils/mono-logger-internals.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_byte (mb, MONO_CUSTOM_PREFIX);
224 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
225 mono_mb_emit_byte (mb, CEE_SHR_UN);
226 mono_mb_emit_stloc (mb, shifted_nursery_start);
228 mono_mb_emit_ldarg (mb, 0);
229 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
230 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
231 mono_mb_emit_byte (mb, CEE_SHR_UN);
232 mono_mb_emit_ldloc (mb, shifted_nursery_start);
233 nursery_check_return_labels [0] = mono_mb_emit_branch (mb, CEE_BEQ);
235 if (!is_concurrent) {
236 // if (!ptr_in_nursery (*ptr)) return;
237 mono_mb_emit_ldarg (mb, 0);
238 mono_mb_emit_byte (mb, CEE_LDIND_I);
239 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
240 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
241 mono_mb_emit_byte (mb, CEE_SHR_UN);
242 mono_mb_emit_ldloc (mb, shifted_nursery_start);
243 nursery_check_return_labels [1] = mono_mb_emit_branch (mb, CEE_BNE_UN);
249 mono_gc_get_specific_write_barrier (gboolean is_concurrent)
252 MonoMethodBuilder *mb;
253 MonoMethodSignature *sig;
254 MonoMethod **write_barrier_method_addr;
256 #ifdef MANAGED_WBARRIER
257 int i, nursery_check_labels [2];
260 // FIXME: Maybe create a separate version for ctors (the branch would be
261 // correctly predicted more times)
263 write_barrier_method_addr = &write_barrier_conc_method;
265 write_barrier_method_addr = &write_barrier_noconc_method;
267 if (*write_barrier_method_addr)
268 return *write_barrier_method_addr;
270 /* Create the IL version of mono_gc_barrier_generic_store () */
271 sig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
272 sig->ret = &mono_defaults.void_class->byval_arg;
273 sig->params [0] = &mono_defaults.int_class->byval_arg;
276 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_conc", MONO_WRAPPER_WRITE_BARRIER);
278 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_noconc", MONO_WRAPPER_WRITE_BARRIER);
281 #ifdef MANAGED_WBARRIER
282 emit_nursery_check (mb, nursery_check_labels, is_concurrent);
284 addr = sgen_cardtable + ((address >> CARD_BITS) & CARD_MASK)
288 LDC_PTR sgen_cardtable
294 if (SGEN_HAVE_OVERLAPPING_CARDS) {
295 LDC_PTR card_table_mask
302 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
303 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_CARD_TABLE);
304 mono_mb_emit_ldarg (mb, 0);
305 mono_mb_emit_icon (mb, CARD_BITS);
306 mono_mb_emit_byte (mb, CEE_SHR_UN);
307 mono_mb_emit_byte (mb, CEE_CONV_I);
308 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
309 #if SIZEOF_VOID_P == 8
310 mono_mb_emit_icon8 (mb, CARD_MASK);
312 mono_mb_emit_icon (mb, CARD_MASK);
314 mono_mb_emit_byte (mb, CEE_CONV_I);
315 mono_mb_emit_byte (mb, CEE_AND);
317 mono_mb_emit_byte (mb, CEE_ADD);
318 mono_mb_emit_icon (mb, 1);
319 mono_mb_emit_byte (mb, CEE_STIND_I1);
322 for (i = 0; i < 2; ++i) {
323 if (nursery_check_labels [i])
324 mono_mb_patch_branch (mb, nursery_check_labels [i]);
326 mono_mb_emit_byte (mb, CEE_RET);
328 mono_mb_emit_ldarg (mb, 0);
329 mono_mb_emit_icall (mb, mono_gc_wbarrier_generic_nostore);
330 mono_mb_emit_byte (mb, CEE_RET);
333 res = mono_mb_create_method (mb, sig, 16);
334 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
335 mono_marshal_set_wrapper_info (res, info);
339 if (*write_barrier_method_addr) {
340 /* Already created */
341 mono_free_method (res);
343 /* double-checked locking */
344 mono_memory_barrier ();
345 *write_barrier_method_addr = res;
349 return *write_barrier_method_addr;
353 mono_gc_get_write_barrier (void)
355 return mono_gc_get_specific_write_barrier (major_collector.is_concurrent);
359 * Dummy filler objects
362 /* Vtable of the objects used to fill out nursery fragments before a collection */
363 static GCVTable array_fill_vtable;
366 get_array_fill_vtable (void)
368 if (!array_fill_vtable) {
369 static MonoClass klass;
370 static char _vtable[sizeof(MonoVTable)+8];
371 MonoVTable* vtable = (MonoVTable*) ALIGN_TO((mword)_vtable, 8);
374 MonoDomain *domain = mono_get_root_domain ();
377 klass.element_class = mono_defaults.byte_class;
379 klass.instance_size = MONO_SIZEOF_MONO_ARRAY;
380 klass.sizes.element_size = 1;
381 klass.name = "array_filler_type";
383 vtable->klass = &klass;
385 vtable->gc_descr = mono_gc_make_descr_for_array (TRUE, &bmap, 0, 1);
388 array_fill_vtable = vtable;
390 return array_fill_vtable;
394 sgen_client_array_fill_range (char *start, size_t size)
398 if (size < MONO_SIZEOF_MONO_ARRAY) {
399 memset (start, 0, size);
403 o = (MonoArray*)start;
404 o->obj.vtable = (MonoVTable*)get_array_fill_vtable ();
405 /* Mark this as not a real object */
406 o->obj.synchronisation = (MonoThreadsSync *)GINT_TO_POINTER (-1);
408 o->max_length = (mono_array_size_t)(size - MONO_SIZEOF_MONO_ARRAY);
414 sgen_client_zero_array_fill_header (void *p, size_t size)
416 if (size >= MONO_SIZEOF_MONO_ARRAY) {
417 memset (p, 0, MONO_SIZEOF_MONO_ARRAY);
419 static guint8 zeros [MONO_SIZEOF_MONO_ARRAY];
421 SGEN_ASSERT (0, !memcmp (p, zeros, size), "TLAB segment must be zeroed out.");
429 static MonoGCFinalizerCallbacks fin_callbacks;
432 mono_gc_get_vtable_bits (MonoClass *klass)
435 /* FIXME move this to the bridge code */
436 if (sgen_need_bridge_processing ()) {
437 switch (sgen_bridge_class_kind (klass)) {
438 case GC_BRIDGE_TRANSPARENT_BRIDGE_CLASS:
439 case GC_BRIDGE_OPAQUE_BRIDGE_CLASS:
440 res = SGEN_GC_BIT_BRIDGE_OBJECT;
442 case GC_BRIDGE_OPAQUE_CLASS:
443 res = SGEN_GC_BIT_BRIDGE_OPAQUE_OBJECT;
445 case GC_BRIDGE_TRANSPARENT_CLASS:
449 if (fin_callbacks.is_class_finalization_aware) {
450 if (fin_callbacks.is_class_finalization_aware (klass))
451 res |= SGEN_GC_BIT_FINALIZER_AWARE;
457 is_finalization_aware (MonoObject *obj)
459 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
460 return (vt->gc_bits & SGEN_GC_BIT_FINALIZER_AWARE) == SGEN_GC_BIT_FINALIZER_AWARE;
464 sgen_client_object_queued_for_finalization (GCObject *obj)
466 if (fin_callbacks.object_queued_for_finalization && is_finalization_aware (obj))
467 fin_callbacks.object_queued_for_finalization (obj);
470 if (G_UNLIKELY (MONO_GC_FINALIZE_ENQUEUE_ENABLED ())) {
471 int gen = sgen_ptr_in_nursery (obj) ? GENERATION_NURSERY : GENERATION_OLD;
472 GCVTable vt = SGEN_LOAD_VTABLE (obj);
473 MONO_GC_FINALIZE_ENQUEUE ((mword)obj, sgen_safe_object_get_size (obj),
474 sgen_client_vtable_get_namespace (vt), sgen_client_vtable_get_name (vt), gen,
475 sgen_client_object_has_critical_finalizer (obj));
481 mono_gc_register_finalizer_callbacks (MonoGCFinalizerCallbacks *callbacks)
483 if (callbacks->version != MONO_GC_FINALIZER_EXTENSION_VERSION)
484 g_error ("Invalid finalizer callback version. Expected %d but got %d\n", MONO_GC_FINALIZER_EXTENSION_VERSION, callbacks->version);
486 fin_callbacks = *callbacks;
490 sgen_client_run_finalize (MonoObject *obj)
492 mono_gc_run_finalize (obj, NULL);
496 mono_gc_invoke_finalizers (void)
498 return sgen_gc_invoke_finalizers ();
502 mono_gc_pending_finalizers (void)
504 return sgen_have_pending_finalizers ();
508 sgen_client_finalize_notify (void)
510 mono_gc_finalize_notify ();
514 mono_gc_register_for_finalization (MonoObject *obj, void *user_data)
516 sgen_object_register_for_finalization (obj, user_data);
520 object_in_domain_predicate (MonoObject *obj, void *user_data)
522 MonoDomain *domain = (MonoDomain *)user_data;
523 if (mono_object_domain (obj) == domain) {
524 SGEN_LOG (5, "Unregistering finalizer for object: %p (%s)", obj, sgen_client_vtable_get_name (SGEN_LOAD_VTABLE (obj)));
531 * mono_gc_finalizers_for_domain:
532 * @domain: the unloading appdomain
533 * @out_array: output array
534 * @out_size: size of output array
536 * Store inside @out_array up to @out_size objects that belong to the unloading
537 * appdomain @domain. Returns the number of stored items. Can be called repeteadly
538 * until it returns 0.
539 * The items are removed from the finalizer data structure, so the caller is supposed
541 * @out_array should be on the stack to allow the GC to know the objects are still alive.
544 mono_gc_finalizers_for_domain (MonoDomain *domain, MonoObject **out_array, int out_size)
546 return sgen_gather_finalizers_if (object_in_domain_predicate, domain, out_array, out_size);
553 typedef struct _EphemeronLinkNode EphemeronLinkNode;
555 struct _EphemeronLinkNode {
556 EphemeronLinkNode *next;
565 static EphemeronLinkNode *ephemeron_list;
567 /* LOCKING: requires that the GC lock is held */
569 null_ephemerons_for_domain (MonoDomain *domain)
571 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
574 MonoObject *object = (MonoObject*)current->array;
577 SGEN_ASSERT (0, object->vtable, "Can't have objects without vtables.");
579 if (object && object->vtable->domain == domain) {
580 EphemeronLinkNode *tmp = current;
583 prev->next = current->next;
585 ephemeron_list = current->next;
587 current = current->next;
588 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
591 current = current->next;
596 /* LOCKING: requires that the GC lock is held */
598 sgen_client_clear_unreachable_ephemerons (ScanCopyContext ctx)
600 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
601 SgenGrayQueue *queue = ctx.queue;
602 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
603 Ephemeron *cur, *array_end;
607 MonoArray *array = current->array;
609 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
610 EphemeronLinkNode *tmp = current;
612 SGEN_LOG (5, "Dead Ephemeron array at %p", array);
615 prev->next = current->next;
617 ephemeron_list = current->next;
619 current = current->next;
620 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
625 copy_func ((GCObject**)&array, queue);
626 current->array = array;
628 SGEN_LOG (5, "Clearing unreachable entries for ephemeron array at %p", array);
630 cur = mono_array_addr (array, Ephemeron, 0);
631 array_end = cur + mono_array_length_fast (array);
632 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
634 for (; cur < array_end; ++cur) {
635 GCObject *key = cur->key;
637 if (!key || key == tombstone)
640 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
641 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
642 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
644 if (!sgen_is_object_alive_for_current_gen (key)) {
645 cur->key = tombstone;
651 current = current->next;
656 LOCKING: requires that the GC lock is held
658 Limitations: We scan all ephemerons on every collection since the current design doesn't allow for a simple nursery/mature split.
661 sgen_client_mark_ephemerons (ScanCopyContext ctx)
663 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
664 SgenGrayQueue *queue = ctx.queue;
665 gboolean nothing_marked = TRUE;
666 EphemeronLinkNode *current = ephemeron_list;
667 Ephemeron *cur, *array_end;
670 for (current = ephemeron_list; current; current = current->next) {
671 MonoArray *array = current->array;
672 SGEN_LOG (5, "Ephemeron array at %p", array);
674 /*It has to be alive*/
675 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
676 SGEN_LOG (5, "\tnot reachable");
680 copy_func ((GCObject**)&array, queue);
682 cur = mono_array_addr (array, Ephemeron, 0);
683 array_end = cur + mono_array_length_fast (array);
684 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
686 for (; cur < array_end; ++cur) {
687 GCObject *key = cur->key;
689 if (!key || key == tombstone)
692 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
693 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
694 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
696 if (sgen_is_object_alive_for_current_gen (key)) {
697 GCObject *value = cur->value;
699 copy_func (&cur->key, queue);
701 if (!sgen_is_object_alive_for_current_gen (value))
702 nothing_marked = FALSE;
703 copy_func (&cur->value, queue);
709 SGEN_LOG (5, "Ephemeron run finished. Is it done %d", nothing_marked);
710 return nothing_marked;
714 mono_gc_ephemeron_array_add (MonoObject *obj)
716 EphemeronLinkNode *node;
720 node = (EphemeronLinkNode *)sgen_alloc_internal (INTERNAL_MEM_EPHEMERON_LINK);
725 node->array = (MonoArray*)obj;
726 node->next = ephemeron_list;
727 ephemeron_list = node;
729 SGEN_LOG (5, "Registered ephemeron array %p", obj);
740 mono_gc_set_current_thread_appdomain (MonoDomain *domain)
742 SgenThreadInfo *info = mono_thread_info_current ();
744 /* Could be called from sgen_thread_unregister () with a NULL info */
747 info->client_info.stopped_domain = domain;
752 need_remove_object_for_domain (GCObject *start, MonoDomain *domain)
754 if (mono_object_domain (start) == domain) {
755 SGEN_LOG (4, "Need to cleanup object %p", start);
756 binary_protocol_cleanup (start, (gpointer)SGEN_LOAD_VTABLE (start), sgen_safe_object_get_size ((GCObject*)start));
763 process_object_for_domain_clearing (GCObject *start, MonoDomain *domain)
765 MonoVTable *vt = SGEN_LOAD_VTABLE (start);
766 if (vt->klass == mono_defaults.internal_thread_class)
767 g_assert (mono_object_domain (start) == mono_get_root_domain ());
768 /* The object could be a proxy for an object in the domain
770 #ifndef DISABLE_REMOTING
771 if (mono_defaults.real_proxy_class->supertypes && mono_class_has_parent_fast (vt->klass, mono_defaults.real_proxy_class)) {
772 MonoObject *server = ((MonoRealProxy*)start)->unwrapped_server;
774 /* The server could already have been zeroed out, so
775 we need to check for that, too. */
776 if (server && (!SGEN_LOAD_VTABLE (server) || mono_object_domain (server) == domain)) {
777 SGEN_LOG (4, "Cleaning up remote pointer in %p to object %p", start, server);
778 ((MonoRealProxy*)start)->unwrapped_server = NULL;
785 clear_domain_process_object (GCObject *obj, MonoDomain *domain)
789 process_object_for_domain_clearing (obj, domain);
790 remove = need_remove_object_for_domain (obj, domain);
792 if (remove && obj->synchronisation) {
793 guint32 dislink = mono_monitor_get_object_monitor_gchandle (obj);
795 mono_gchandle_free (dislink);
802 clear_domain_process_minor_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
804 if (clear_domain_process_object (obj, domain)) {
805 CANARIFY_SIZE (size);
806 memset (obj, 0, size);
811 clear_domain_process_major_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
813 clear_domain_process_object (obj, domain);
817 clear_domain_free_major_non_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
819 if (need_remove_object_for_domain (obj, domain))
820 major_collector.free_non_pinned_object (obj, size);
824 clear_domain_free_major_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
826 if (need_remove_object_for_domain (obj, domain))
827 major_collector.free_pinned_object (obj, size);
831 * When appdomains are unloaded we can easily remove objects that have finalizers,
832 * but all the others could still be present in random places on the heap.
833 * We need a sweep to get rid of them even though it's going to be costly
835 * The reason we need to remove them is because we access the vtable and class
836 * structures to know the object size and the reference bitmap: once the domain is
837 * unloaded the point to random memory.
840 mono_gc_clear_domain (MonoDomain * domain)
842 LOSObject *bigobj, *prev;
847 binary_protocol_domain_unload_begin (domain);
851 if (sgen_concurrent_collection_in_progress ())
852 sgen_perform_collection (0, GENERATION_OLD, "clear domain", TRUE);
853 SGEN_ASSERT (0, !sgen_concurrent_collection_in_progress (), "We just ordered a synchronous collection. Why are we collecting concurrently?");
855 major_collector.finish_sweeping ();
857 sgen_process_fin_stage_entries ();
859 sgen_clear_nursery_fragments ();
861 if (sgen_mono_xdomain_checks && domain != mono_get_root_domain ()) {
862 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_NORMAL);
863 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_WBARRIER);
864 sgen_check_for_xdomain_refs ();
867 /*Ephemerons and dislinks must be processed before LOS since they might end up pointing
868 to memory returned to the OS.*/
869 null_ephemerons_for_domain (domain);
870 sgen_null_links_for_domain (domain);
872 for (i = GENERATION_NURSERY; i < GENERATION_MAX; ++i)
873 sgen_remove_finalizers_if (object_in_domain_predicate, domain, i);
875 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
876 (IterateObjectCallbackFunc)clear_domain_process_minor_object_callback, domain, FALSE, TRUE);
878 /* We need two passes over major and large objects because
879 freeing such objects might give their memory back to the OS
880 (in the case of large objects) or obliterate its vtable
881 (pinned objects with major-copying or pinned and non-pinned
882 objects with major-mark&sweep), but we might need to
883 dereference a pointer from an object to another object if
884 the first object is a proxy. */
885 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, (IterateObjectCallbackFunc)clear_domain_process_major_object_callback, domain);
886 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
887 clear_domain_process_object ((GCObject*)bigobj->data, domain);
890 for (bigobj = los_object_list; bigobj;) {
891 if (need_remove_object_for_domain ((GCObject*)bigobj->data, domain)) {
892 LOSObject *to_free = bigobj;
894 prev->next = bigobj->next;
896 los_object_list = bigobj->next;
897 bigobj = bigobj->next;
898 SGEN_LOG (4, "Freeing large object %p", bigobj->data);
899 sgen_los_free_object (to_free);
903 bigobj = bigobj->next;
905 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_NON_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_non_pinned_object_callback, domain);
906 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_pinned_object_callback, domain);
908 if (domain == mono_get_root_domain ()) {
909 sgen_pin_stats_print_class_stats ();
910 sgen_object_layout_dump (stdout);
913 sgen_restart_world (0, NULL);
915 binary_protocol_domain_unload_end (domain);
916 binary_protocol_flush_buffers (FALSE);
925 static gboolean alloc_events = FALSE;
928 mono_gc_enable_alloc_events (void)
934 mono_gc_alloc_obj (MonoVTable *vtable, size_t size)
936 MonoObject *obj = sgen_alloc_obj (vtable, size);
938 if (G_UNLIKELY (alloc_events))
939 mono_profiler_allocation (obj);
945 mono_gc_alloc_pinned_obj (MonoVTable *vtable, size_t size)
947 MonoObject *obj = sgen_alloc_obj_pinned (vtable, size);
949 if (G_UNLIKELY (alloc_events))
950 mono_profiler_allocation (obj);
956 mono_gc_alloc_mature (MonoVTable *vtable)
958 MonoObject *obj = sgen_alloc_obj_mature (vtable, vtable->klass->instance_size);
960 if (obj && G_UNLIKELY (obj->vtable->klass->has_finalize))
961 mono_object_register_finalizer (obj);
963 if (G_UNLIKELY (alloc_events))
964 mono_profiler_allocation (obj);
970 mono_gc_alloc_fixed (size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
972 /* FIXME: do a single allocation */
973 void *res = calloc (1, size);
976 if (!mono_gc_register_root ((char *)res, size, descr, source, msg)) {
984 mono_gc_free_fixed (void* addr)
986 mono_gc_deregister_root ((char *)addr);
994 static MonoMethod* alloc_method_cache [ATYPE_NUM];
995 static MonoMethod* slowpath_alloc_method_cache [ATYPE_NUM];
996 static gboolean use_managed_allocator = TRUE;
998 #ifdef MANAGED_ALLOCATION
1000 #ifdef HAVE_KW_THREAD
1002 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { \
1003 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1004 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1005 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_TLAB_NEXT_ADDR); \
1008 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { \
1009 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1010 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1011 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_TLAB_TEMP_END); \
1016 #if defined(TARGET_OSX) || defined(TARGET_WIN32) || defined(TARGET_ANDROID) || defined(TARGET_IOS)
1017 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { \
1018 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1019 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1020 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1021 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_next_addr)); \
1022 mono_mb_emit_byte ((mb), CEE_ADD); \
1023 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1026 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { \
1027 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1028 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1029 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1030 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_temp_end)); \
1031 mono_mb_emit_byte ((mb), CEE_ADD); \
1032 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1036 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1037 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1042 /* FIXME: Do this in the JIT, where specialized allocation sequences can be created
1043 * for each class. This is currently not easy to do, as it is hard to generate basic
1044 * blocks + branches, but it is easy with the linear IL codebase.
1046 * For this to work we'd need to solve the TLAB race, first. Now we
1047 * require the allocator to be in a few known methods to make sure
1048 * that they are executed atomically via the restart mechanism.
1051 create_allocator (int atype, gboolean slowpath)
1053 int p_var, size_var;
1054 guint32 slowpath_branch, max_size_branch;
1055 MonoMethodBuilder *mb;
1057 MonoMethodSignature *csig;
1058 static gboolean registered = FALSE;
1059 int tlab_next_addr_var, new_next_var;
1060 const char *name = NULL;
1065 mono_register_jit_icall (mono_gc_alloc_obj, "mono_gc_alloc_obj", mono_create_icall_signature ("object ptr int"), FALSE);
1066 mono_register_jit_icall (mono_gc_alloc_vector, "mono_gc_alloc_vector", mono_create_icall_signature ("object ptr int int"), FALSE);
1067 mono_register_jit_icall (mono_gc_alloc_string, "mono_gc_alloc_string", mono_create_icall_signature ("object ptr int int32"), FALSE);
1071 if (atype == ATYPE_SMALL) {
1072 name = slowpath ? "SlowAllocSmall" : "AllocSmall";
1073 } else if (atype == ATYPE_NORMAL) {
1074 name = slowpath ? "SlowAlloc" : "Alloc";
1075 } else if (atype == ATYPE_VECTOR) {
1076 name = slowpath ? "SlowAllocVector" : "AllocVector";
1077 } else if (atype == ATYPE_STRING) {
1078 name = slowpath ? "SlowAllocString" : "AllocString";
1080 g_assert_not_reached ();
1083 if (atype == ATYPE_NORMAL)
1088 csig = mono_metadata_signature_alloc (mono_defaults.corlib, num_params);
1089 if (atype == ATYPE_STRING) {
1090 csig->ret = &mono_defaults.string_class->byval_arg;
1091 csig->params [0] = &mono_defaults.int_class->byval_arg;
1092 csig->params [1] = &mono_defaults.int32_class->byval_arg;
1094 csig->ret = &mono_defaults.object_class->byval_arg;
1095 for (i = 0; i < num_params; i++)
1096 csig->params [i] = &mono_defaults.int_class->byval_arg;
1099 mb = mono_mb_new (mono_defaults.object_class, name, MONO_WRAPPER_ALLOC);
1106 mono_mb_emit_ldarg (mb, 0);
1107 mono_mb_emit_icall (mb, mono_object_new_specific);
1110 mono_mb_emit_ldarg (mb, 0);
1111 mono_mb_emit_ldarg (mb, 1);
1112 mono_mb_emit_icall (mb, mono_array_new_specific);
1115 mono_mb_emit_ldarg (mb, 1);
1116 mono_mb_emit_icall (mb, mono_string_alloc);
1119 g_assert_not_reached ();
1125 size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1126 if (atype == ATYPE_SMALL) {
1127 /* size_var = size_arg */
1128 mono_mb_emit_ldarg (mb, 1);
1129 mono_mb_emit_stloc (mb, size_var);
1130 } else if (atype == ATYPE_NORMAL) {
1131 /* size = vtable->klass->instance_size; */
1132 mono_mb_emit_ldarg (mb, 0);
1133 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1134 mono_mb_emit_byte (mb, CEE_ADD);
1135 mono_mb_emit_byte (mb, CEE_LDIND_I);
1136 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, instance_size));
1137 mono_mb_emit_byte (mb, CEE_ADD);
1138 /* FIXME: assert instance_size stays a 4 byte integer */
1139 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1140 mono_mb_emit_byte (mb, CEE_CONV_I);
1141 mono_mb_emit_stloc (mb, size_var);
1142 } else if (atype == ATYPE_VECTOR) {
1143 MonoExceptionClause *clause;
1144 int pos, pos_leave, pos_error;
1145 MonoClass *oom_exc_class;
1149 * n > MONO_ARRAY_MAX_INDEX => OutOfMemoryException
1150 * n < 0 => OverflowException
1152 * We can do an unsigned comparison to catch both cases, then in the error
1153 * case compare signed to distinguish between them.
1155 mono_mb_emit_ldarg (mb, 1);
1156 mono_mb_emit_icon (mb, MONO_ARRAY_MAX_INDEX);
1157 mono_mb_emit_byte (mb, CEE_CONV_U);
1158 pos = mono_mb_emit_short_branch (mb, CEE_BLE_UN_S);
1160 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1161 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1162 mono_mb_emit_ldarg (mb, 1);
1163 mono_mb_emit_icon (mb, 0);
1164 pos_error = mono_mb_emit_short_branch (mb, CEE_BLT_S);
1165 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1166 mono_mb_patch_short_branch (mb, pos_error);
1167 mono_mb_emit_exception (mb, "OverflowException", NULL);
1169 mono_mb_patch_short_branch (mb, pos);
1171 clause = (MonoExceptionClause *)mono_image_alloc0 (mono_defaults.corlib, sizeof (MonoExceptionClause));
1172 clause->try_offset = mono_mb_get_label (mb);
1174 /* vtable->klass->sizes.element_size */
1175 mono_mb_emit_ldarg (mb, 0);
1176 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1177 mono_mb_emit_byte (mb, CEE_ADD);
1178 mono_mb_emit_byte (mb, CEE_LDIND_I);
1179 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, sizes));
1180 mono_mb_emit_byte (mb, CEE_ADD);
1181 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1182 mono_mb_emit_byte (mb, CEE_CONV_I);
1185 mono_mb_emit_ldarg (mb, 1);
1186 mono_mb_emit_byte (mb, CEE_MUL_OVF_UN);
1187 /* + sizeof (MonoArray) */
1188 mono_mb_emit_icon (mb, MONO_SIZEOF_MONO_ARRAY);
1189 mono_mb_emit_byte (mb, CEE_ADD_OVF_UN);
1190 mono_mb_emit_stloc (mb, size_var);
1192 pos_leave = mono_mb_emit_branch (mb, CEE_LEAVE);
1195 clause->flags = MONO_EXCEPTION_CLAUSE_NONE;
1196 clause->try_len = mono_mb_get_pos (mb) - clause->try_offset;
1197 clause->data.catch_class = mono_class_from_name (mono_defaults.corlib,
1198 "System", "OverflowException");
1199 g_assert (clause->data.catch_class);
1200 clause->handler_offset = mono_mb_get_label (mb);
1202 oom_exc_class = mono_class_from_name (mono_defaults.corlib,
1203 "System", "OutOfMemoryException");
1204 g_assert (oom_exc_class);
1205 ctor = mono_class_get_method_from_name (oom_exc_class, ".ctor", 0);
1208 mono_mb_emit_byte (mb, CEE_POP);
1209 mono_mb_emit_op (mb, CEE_NEWOBJ, ctor);
1210 mono_mb_emit_byte (mb, CEE_THROW);
1212 clause->handler_len = mono_mb_get_pos (mb) - clause->handler_offset;
1213 mono_mb_set_clauses (mb, 1, clause);
1214 mono_mb_patch_branch (mb, pos_leave);
1216 } else if (atype == ATYPE_STRING) {
1220 * a string allocator method takes the args: (vtable, len)
1222 * bytes = offsetof (MonoString, chars) + ((len + 1) * 2)
1226 * bytes <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1230 * offsetof (MonoString, chars) + ((len + 1) * 2) <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1231 * len <= (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - offsetof (MonoString, chars)) / 2 - 1
1233 mono_mb_emit_ldarg (mb, 1);
1234 mono_mb_emit_icon (mb, (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - MONO_STRUCT_OFFSET (MonoString, chars)) / 2 - 1);
1235 pos = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
1237 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1238 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1239 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1240 mono_mb_patch_short_branch (mb, pos);
1242 mono_mb_emit_ldarg (mb, 1);
1243 mono_mb_emit_icon (mb, 1);
1244 mono_mb_emit_byte (mb, MONO_CEE_SHL);
1245 //WE manually fold the above + 2 here
1246 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, chars) + 2);
1247 mono_mb_emit_byte (mb, CEE_ADD);
1248 mono_mb_emit_stloc (mb, size_var);
1250 g_assert_not_reached ();
1253 if (atype != ATYPE_SMALL) {
1254 /* size += ALLOC_ALIGN - 1; */
1255 mono_mb_emit_ldloc (mb, size_var);
1256 mono_mb_emit_icon (mb, SGEN_ALLOC_ALIGN - 1);
1257 mono_mb_emit_byte (mb, CEE_ADD);
1258 /* size &= ~(ALLOC_ALIGN - 1); */
1259 mono_mb_emit_icon (mb, ~(SGEN_ALLOC_ALIGN - 1));
1260 mono_mb_emit_byte (mb, CEE_AND);
1261 mono_mb_emit_stloc (mb, size_var);
1264 /* if (size > MAX_SMALL_OBJ_SIZE) goto slowpath */
1265 if (atype != ATYPE_SMALL) {
1266 mono_mb_emit_ldloc (mb, size_var);
1267 mono_mb_emit_icon (mb, SGEN_MAX_SMALL_OBJ_SIZE);
1268 max_size_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
1272 * We need to modify tlab_next, but the JIT only supports reading, so we read
1273 * another tls var holding its address instead.
1276 /* tlab_next_addr (local) = tlab_next_addr (TLS var) */
1277 tlab_next_addr_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1278 EMIT_TLS_ACCESS_NEXT_ADDR (mb);
1279 mono_mb_emit_stloc (mb, tlab_next_addr_var);
1281 /* p = (void**)tlab_next; */
1282 p_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1283 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1284 mono_mb_emit_byte (mb, CEE_LDIND_I);
1285 mono_mb_emit_stloc (mb, p_var);
1287 /* new_next = (char*)p + size; */
1288 new_next_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1289 mono_mb_emit_ldloc (mb, p_var);
1290 mono_mb_emit_ldloc (mb, size_var);
1291 mono_mb_emit_byte (mb, CEE_CONV_I);
1292 mono_mb_emit_byte (mb, CEE_ADD);
1293 mono_mb_emit_stloc (mb, new_next_var);
1295 /* if (G_LIKELY (new_next < tlab_temp_end)) */
1296 mono_mb_emit_ldloc (mb, new_next_var);
1297 EMIT_TLS_ACCESS_TEMP_END (mb);
1298 slowpath_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
1301 if (atype != ATYPE_SMALL)
1302 mono_mb_patch_short_branch (mb, max_size_branch);
1304 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1305 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1307 /* FIXME: mono_gc_alloc_obj takes a 'size_t' as an argument, not an int32 */
1308 mono_mb_emit_ldarg (mb, 0);
1309 mono_mb_emit_ldloc (mb, size_var);
1310 if (atype == ATYPE_NORMAL || atype == ATYPE_SMALL) {
1311 mono_mb_emit_icall (mb, mono_gc_alloc_obj);
1312 } else if (atype == ATYPE_VECTOR) {
1313 mono_mb_emit_ldarg (mb, 1);
1314 mono_mb_emit_icall (mb, mono_gc_alloc_vector);
1315 } else if (atype == ATYPE_STRING) {
1316 mono_mb_emit_ldarg (mb, 1);
1317 mono_mb_emit_icall (mb, mono_gc_alloc_string);
1319 g_assert_not_reached ();
1321 mono_mb_emit_byte (mb, CEE_RET);
1324 mono_mb_patch_short_branch (mb, slowpath_branch);
1326 /* FIXME: Memory barrier */
1328 /* tlab_next = new_next */
1329 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1330 mono_mb_emit_ldloc (mb, new_next_var);
1331 mono_mb_emit_byte (mb, CEE_STIND_I);
1333 /*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. */
1334 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1335 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1336 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1339 mono_mb_emit_ldloc (mb, p_var);
1340 mono_mb_emit_ldarg (mb, 0);
1341 mono_mb_emit_byte (mb, CEE_STIND_I);
1343 if (atype == ATYPE_VECTOR) {
1344 /* arr->max_length = max_length; */
1345 mono_mb_emit_ldloc (mb, p_var);
1346 mono_mb_emit_ldflda (mb, MONO_STRUCT_OFFSET (MonoArray, max_length));
1347 mono_mb_emit_ldarg (mb, 1);
1348 #ifdef MONO_BIG_ARRAYS
1349 mono_mb_emit_byte (mb, CEE_STIND_I);
1351 mono_mb_emit_byte (mb, CEE_STIND_I4);
1353 } else if (atype == ATYPE_STRING) {
1354 /* need to set length and clear the last char */
1355 /* s->length = len; */
1356 mono_mb_emit_ldloc (mb, p_var);
1357 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, length));
1358 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1359 mono_mb_emit_ldarg (mb, 1);
1360 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
1361 /* s->chars [len] = 0; */
1362 mono_mb_emit_ldloc (mb, p_var);
1363 mono_mb_emit_ldloc (mb, size_var);
1364 mono_mb_emit_icon (mb, 2);
1365 mono_mb_emit_byte (mb, MONO_CEE_SUB);
1366 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1367 mono_mb_emit_icon (mb, 0);
1368 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
1372 We must make sure both vtable and max_length are globaly visible before returning to managed land.
1374 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1375 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1376 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1379 mono_mb_emit_ldloc (mb, p_var);
1382 mono_mb_emit_byte (mb, CEE_RET);
1385 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
1386 info->d.alloc.gc_name = "sgen";
1387 info->d.alloc.alloc_type = atype;
1389 res = mono_mb_create (mb, csig, 8, info);
1392 mono_method_get_header (res)->init_locals = FALSE;
1401 mono_gc_get_aligned_size_for_allocator (int size)
1403 return SGEN_ALIGN_UP (size);
1407 * Generate an allocator method implementing the fast path of mono_gc_alloc_obj ().
1408 * The signature of the called method is:
1409 * object allocate (MonoVTable *vtable)
1412 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box, gboolean known_instance_size)
1414 #ifdef MANAGED_ALLOCATION
1415 if (collect_before_allocs)
1417 if (!mono_runtime_has_tls_get ())
1419 if (klass->instance_size > tlab_size)
1421 if (known_instance_size && ALIGN_TO (klass->instance_size, SGEN_ALLOC_ALIGN) >= SGEN_MAX_SMALL_OBJ_SIZE)
1423 if (mono_class_has_finalizer (klass) || mono_class_is_marshalbyref (klass) || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
1427 if (klass->byval_arg.type == MONO_TYPE_STRING)
1428 return mono_gc_get_managed_allocator_by_type (ATYPE_STRING, FALSE);
1429 /* Generic classes have dynamic field and can go above MAX_SMALL_OBJ_SIZE. */
1430 if (known_instance_size)
1431 return mono_gc_get_managed_allocator_by_type (ATYPE_SMALL, FALSE);
1433 return mono_gc_get_managed_allocator_by_type (ATYPE_NORMAL, FALSE);
1440 mono_gc_get_managed_array_allocator (MonoClass *klass)
1442 #ifdef MANAGED_ALLOCATION
1443 if (klass->rank != 1)
1445 if (!mono_runtime_has_tls_get ())
1447 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1449 if (has_per_allocation_action)
1451 g_assert (!mono_class_has_finalizer (klass) && !mono_class_is_marshalbyref (klass));
1453 return mono_gc_get_managed_allocator_by_type (ATYPE_VECTOR, FALSE);
1460 sgen_set_use_managed_allocator (gboolean flag)
1462 use_managed_allocator = flag;
1466 mono_gc_get_managed_allocator_by_type (int atype, gboolean slowpath)
1468 #ifdef MANAGED_ALLOCATION
1470 MonoMethod **cache = slowpath ? slowpath_alloc_method_cache : alloc_method_cache;
1472 if (!use_managed_allocator)
1475 if (!mono_runtime_has_tls_get ())
1478 res = cache [atype];
1482 res = create_allocator (atype, slowpath);
1484 if (cache [atype]) {
1485 mono_free_method (res);
1486 res = cache [atype];
1488 mono_memory_barrier ();
1489 cache [atype] = res;
1500 mono_gc_get_managed_allocator_types (void)
1506 sgen_is_managed_allocator (MonoMethod *method)
1510 for (i = 0; i < ATYPE_NUM; ++i)
1511 if (method == alloc_method_cache [i] || method == slowpath_alloc_method_cache [i])
1517 sgen_has_managed_allocator (void)
1521 for (i = 0; i < ATYPE_NUM; ++i)
1522 if (alloc_method_cache [i] || slowpath_alloc_method_cache [i])
1528 * Cardtable scanning
1531 #define MWORD_MASK (sizeof (mword) - 1)
1534 find_card_offset (mword card)
1536 /*XXX Use assembly as this generates some pretty bad code */
1537 #if defined(__i386__) && defined(__GNUC__)
1538 return (__builtin_ffs (card) - 1) / 8;
1539 #elif defined(__x86_64__) && defined(__GNUC__)
1540 return (__builtin_ffsll (card) - 1) / 8;
1541 #elif defined(__s390x__)
1542 return (__builtin_ffsll (GUINT64_TO_LE(card)) - 1) / 8;
1545 guint8 *ptr = (guint8 *) &card;
1546 for (i = 0; i < sizeof (mword); ++i) {
1555 find_next_card (guint8 *card_data, guint8 *end)
1557 mword *cards, *cards_end;
1560 while ((((mword)card_data) & MWORD_MASK) && card_data < end) {
1566 if (card_data == end)
1569 cards = (mword*)card_data;
1570 cards_end = (mword*)((mword)end & ~MWORD_MASK);
1571 while (cards < cards_end) {
1574 return (guint8*)cards + find_card_offset (card);
1578 card_data = (guint8*)cards_end;
1579 while (card_data < end) {
1588 #define ARRAY_OBJ_INDEX(ptr,array,elem_size) (((char*)(ptr) - ((char*)(array) + G_STRUCT_OFFSET (MonoArray, vector))) / (elem_size))
1591 sgen_client_cardtable_scan_object (GCObject *obj, mword block_obj_size, guint8 *cards, gboolean mod_union, ScanCopyContext ctx)
1593 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
1594 MonoClass *klass = vt->klass;
1596 SGEN_ASSERT (0, SGEN_VTABLE_HAS_REFERENCES (vt), "Why would we ever call this on reference-free objects?");
1599 MonoArray *arr = (MonoArray*)obj;
1600 guint8 *card_data, *card_base;
1601 guint8 *card_data_end;
1602 char *obj_start = (char *)sgen_card_table_align_pointer (obj);
1604 mword obj_size = sgen_mono_array_size (vt, arr, &bounds_size, sgen_vtable_get_descriptor (vt));
1605 /* We don't want to scan the bounds entries at the end of multidimensional arrays */
1606 char *obj_end = (char*)obj + obj_size - bounds_size;
1608 size_t extra_idx = 0;
1610 mword desc = (mword)klass->element_class->gc_descr;
1611 int elem_size = mono_array_element_size (klass);
1613 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1614 guint8 *overflow_scan_end = NULL;
1617 #ifdef SGEN_OBJECT_LAYOUT_STATISTICS
1618 if (klass->element_class->valuetype)
1619 sgen_object_layout_scanned_vtype_array ();
1621 sgen_object_layout_scanned_ref_array ();
1627 card_data = sgen_card_table_get_card_scan_address ((mword)obj);
1629 card_base = card_data;
1630 card_count = sgen_card_table_number_of_cards_in_range ((mword)obj, obj_size);
1631 card_data_end = card_data + card_count;
1634 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1635 /*Check for overflow and if so, setup to scan in two steps*/
1636 if (!cards && card_data_end >= SGEN_SHADOW_CARDTABLE_END) {
1637 overflow_scan_end = sgen_shadow_cardtable + (card_data_end - SGEN_SHADOW_CARDTABLE_END);
1638 card_data_end = SGEN_SHADOW_CARDTABLE_END;
1644 card_data = find_next_card (card_data, card_data_end);
1645 for (; card_data < card_data_end; card_data = find_next_card (card_data + 1, card_data_end)) {
1647 size_t idx = (card_data - card_base) + extra_idx;
1648 char *start = (char*)(obj_start + idx * CARD_SIZE_IN_BYTES);
1649 char *card_end = start + CARD_SIZE_IN_BYTES;
1650 char *first_elem, *elem;
1652 HEAVY_STAT (++los_marked_cards);
1655 sgen_card_table_prepare_card_for_scanning (card_data);
1657 card_end = MIN (card_end, obj_end);
1659 if (start <= (char*)arr->vector)
1662 index = ARRAY_OBJ_INDEX (start, obj, elem_size);
1664 elem = first_elem = (char*)mono_array_addr_with_size_fast ((MonoArray*)obj, elem_size, index);
1665 if (klass->element_class->valuetype) {
1666 ScanVTypeFunc scan_vtype_func = ctx.ops->scan_vtype;
1668 for (; elem < card_end; elem += elem_size)
1669 scan_vtype_func (obj, elem, desc, ctx.queue BINARY_PROTOCOL_ARG (elem_size));
1671 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
1673 HEAVY_STAT (++los_array_cards);
1674 for (; elem < card_end; elem += SIZEOF_VOID_P) {
1676 gpointer old = *(gpointer*)elem;
1677 if ((mod_union && old) || G_UNLIKELY (sgen_ptr_in_nursery (old))) {
1678 HEAVY_STAT (++los_array_remsets);
1679 copy_func ((GCObject**)elem, ctx.queue);
1680 new_ = *(GCObject **)elem;
1681 if (G_UNLIKELY (sgen_ptr_in_nursery (new_)))
1682 sgen_add_to_global_remset (elem, new_);
1687 binary_protocol_card_scan (first_elem, elem - first_elem);
1690 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1691 if (overflow_scan_end) {
1692 extra_idx = card_data - card_base;
1693 card_base = card_data = sgen_shadow_cardtable;
1694 card_data_end = overflow_scan_end;
1695 overflow_scan_end = NULL;
1706 * Array and string allocation
1710 mono_gc_alloc_vector (MonoVTable *vtable, size_t size, uintptr_t max_length)
1715 if (!SGEN_CAN_ALIGN_UP (size))
1718 #ifndef DISABLE_CRITICAL_REGION
1719 ENTER_CRITICAL_REGION;
1720 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1722 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1723 arr->max_length = (mono_array_size_t)max_length;
1724 EXIT_CRITICAL_REGION;
1727 EXIT_CRITICAL_REGION;
1732 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1733 if (G_UNLIKELY (!arr)) {
1735 return mono_gc_out_of_memory (size);
1738 arr->max_length = (mono_array_size_t)max_length;
1743 if (G_UNLIKELY (alloc_events))
1744 mono_profiler_allocation (&arr->obj);
1746 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Vector has incorrect size.");
1751 mono_gc_alloc_array (MonoVTable *vtable, size_t size, uintptr_t max_length, uintptr_t bounds_size)
1754 MonoArrayBounds *bounds;
1757 if (!SGEN_CAN_ALIGN_UP (size))
1760 #ifndef DISABLE_CRITICAL_REGION
1761 ENTER_CRITICAL_REGION;
1762 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1764 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1765 arr->max_length = (mono_array_size_t)max_length;
1767 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1768 arr->bounds = bounds;
1769 EXIT_CRITICAL_REGION;
1772 EXIT_CRITICAL_REGION;
1777 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1778 if (G_UNLIKELY (!arr)) {
1780 return mono_gc_out_of_memory (size);
1783 arr->max_length = (mono_array_size_t)max_length;
1785 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1786 arr->bounds = bounds;
1791 if (G_UNLIKELY (alloc_events))
1792 mono_profiler_allocation (&arr->obj);
1794 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Array has incorrect size.");
1799 mono_gc_alloc_string (MonoVTable *vtable, size_t size, gint32 len)
1804 if (!SGEN_CAN_ALIGN_UP (size))
1807 #ifndef DISABLE_CRITICAL_REGION
1808 ENTER_CRITICAL_REGION;
1809 str = (MonoString*)sgen_try_alloc_obj_nolock (vtable, size);
1811 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1813 EXIT_CRITICAL_REGION;
1816 EXIT_CRITICAL_REGION;
1821 str = (MonoString*)sgen_alloc_obj_nolock (vtable, size);
1822 if (G_UNLIKELY (!str)) {
1824 return mono_gc_out_of_memory (size);
1832 if (G_UNLIKELY (alloc_events))
1833 mono_profiler_allocation (&str->object);
1843 mono_gc_set_string_length (MonoString *str, gint32 new_length)
1845 mono_unichar2 *new_end = str->chars + new_length;
1847 /* zero the discarded string. This null-delimits the string and allows
1848 * the space to be reclaimed by SGen. */
1850 if (nursery_canaries_enabled () && sgen_ptr_in_nursery (str)) {
1851 CHECK_CANARY_FOR_OBJECT ((GCObject*)str, TRUE);
1852 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2) + CANARY_SIZE);
1853 memcpy (new_end + 1 , CANARY_STRING, CANARY_SIZE);
1855 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2));
1858 str->length = new_length;
1865 #define GC_ROOT_NUM 32
1867 int count; /* must be the first field */
1868 void *objects [GC_ROOT_NUM];
1869 int root_types [GC_ROOT_NUM];
1870 uintptr_t extra_info [GC_ROOT_NUM];
1874 notify_gc_roots (GCRootReport *report)
1878 mono_profiler_gc_roots (report->count, report->objects, report->root_types, report->extra_info);
1883 add_profile_gc_root (GCRootReport *report, void *object, int rtype, uintptr_t extra_info)
1885 if (report->count == GC_ROOT_NUM)
1886 notify_gc_roots (report);
1887 report->objects [report->count] = object;
1888 report->root_types [report->count] = rtype;
1889 report->extra_info [report->count++] = (uintptr_t)SGEN_LOAD_VTABLE (object)->klass;
1893 sgen_client_nursery_objects_pinned (void **definitely_pinned, int count)
1895 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS) {
1896 GCRootReport report;
1899 for (idx = 0; idx < count; ++idx)
1900 add_profile_gc_root (&report, definitely_pinned [idx], MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
1901 notify_gc_roots (&report);
1906 report_finalizer_roots_from_queue (SgenPointerQueue *queue)
1908 GCRootReport report;
1912 for (i = 0; i < queue->next_slot; ++i) {
1913 void *obj = queue->data [i];
1916 add_profile_gc_root (&report, obj, MONO_PROFILE_GC_ROOT_FINALIZER, 0);
1918 notify_gc_roots (&report);
1922 report_finalizer_roots (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
1924 report_finalizer_roots_from_queue (fin_ready_queue);
1925 report_finalizer_roots_from_queue (critical_fin_queue);
1928 static GCRootReport *root_report;
1931 single_arg_report_root (MonoObject **obj, void *gc_data)
1934 add_profile_gc_root (root_report, *obj, MONO_PROFILE_GC_ROOT_OTHER, 0);
1938 precisely_report_roots_from (GCRootReport *report, void** start_root, void** end_root, mword desc)
1940 switch (desc & ROOT_DESC_TYPE_MASK) {
1941 case ROOT_DESC_BITMAP:
1942 desc >>= ROOT_DESC_TYPE_SHIFT;
1944 if ((desc & 1) && *start_root) {
1945 add_profile_gc_root (report, *start_root, MONO_PROFILE_GC_ROOT_OTHER, 0);
1951 case ROOT_DESC_COMPLEX: {
1952 gsize *bitmap_data = (gsize *)sgen_get_complex_descriptor_bitmap (desc);
1953 gsize bwords = (*bitmap_data) - 1;
1954 void **start_run = start_root;
1956 while (bwords-- > 0) {
1957 gsize bmap = *bitmap_data++;
1958 void **objptr = start_run;
1960 if ((bmap & 1) && *objptr) {
1961 add_profile_gc_root (report, *objptr, MONO_PROFILE_GC_ROOT_OTHER, 0);
1966 start_run += GC_BITS_PER_WORD;
1970 case ROOT_DESC_USER: {
1971 MonoGCRootMarkFunc marker = (MonoGCRootMarkFunc)sgen_get_user_descriptor_func (desc);
1972 root_report = report;
1973 marker ((MonoObject**)start_root, single_arg_report_root, NULL);
1976 case ROOT_DESC_RUN_LEN:
1977 g_assert_not_reached ();
1979 g_assert_not_reached ();
1984 report_registered_roots_by_type (int root_type)
1986 GCRootReport report;
1990 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], void **, start_root, RootRecord *, root) {
1991 SGEN_LOG (6, "Precise root scan %p-%p (desc: %p)", start_root, root->end_root, (void*)root->root_desc);
1992 precisely_report_roots_from (&report, start_root, (void**)root->end_root, root->root_desc);
1993 } SGEN_HASH_TABLE_FOREACH_END;
1994 notify_gc_roots (&report);
1998 report_registered_roots (void)
2000 report_registered_roots_by_type (ROOT_TYPE_NORMAL);
2001 report_registered_roots_by_type (ROOT_TYPE_WBARRIER);
2005 sgen_client_collecting_minor (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2007 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2008 report_registered_roots ();
2009 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2010 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2013 static GCRootReport major_root_report;
2014 static gboolean profile_roots;
2017 sgen_client_collecting_major_1 (void)
2019 profile_roots = mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS;
2020 memset (&major_root_report, 0, sizeof (GCRootReport));
2024 sgen_client_pinned_los_object (GCObject *obj)
2027 add_profile_gc_root (&major_root_report, (char*)obj, MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
2031 sgen_client_collecting_major_2 (void)
2034 notify_gc_roots (&major_root_report);
2036 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2037 report_registered_roots ();
2041 sgen_client_collecting_major_3 (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2043 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2044 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2047 #define MOVED_OBJECTS_NUM 64
2048 static void *moved_objects [MOVED_OBJECTS_NUM];
2049 static int moved_objects_idx = 0;
2052 mono_sgen_register_moved_object (void *obj, void *destination)
2054 g_assert (mono_profiler_events & MONO_PROFILE_GC_MOVES);
2056 if (moved_objects_idx == MOVED_OBJECTS_NUM) {
2057 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2058 moved_objects_idx = 0;
2060 moved_objects [moved_objects_idx++] = obj;
2061 moved_objects [moved_objects_idx++] = destination;
2065 mono_sgen_gc_event_moves (void)
2067 if (moved_objects_idx) {
2068 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2069 moved_objects_idx = 0;
2077 #define REFS_SIZE 128
2080 MonoGCReferences callback;
2084 MonoObject *refs [REFS_SIZE];
2085 uintptr_t offsets [REFS_SIZE];
2089 #define HANDLE_PTR(ptr,obj) do { \
2091 if (hwi->count == REFS_SIZE) { \
2092 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data); \
2096 hwi->offsets [hwi->count] = (char*)(ptr)-(char*)start; \
2097 hwi->refs [hwi->count++] = *(ptr); \
2102 collect_references (HeapWalkInfo *hwi, GCObject *obj, size_t size)
2104 char *start = (char*)obj;
2105 mword desc = sgen_obj_get_descriptor (obj);
2107 #include "sgen/sgen-scan-object.h"
2111 walk_references (GCObject *start, size_t size, void *data)
2113 HeapWalkInfo *hwi = (HeapWalkInfo *)data;
2116 collect_references (hwi, start, size);
2117 if (hwi->count || !hwi->called)
2118 hwi->callback (start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data);
2122 * mono_gc_walk_heap:
2123 * @flags: flags for future use
2124 * @callback: a function pointer called for each object in the heap
2125 * @data: a user data pointer that is passed to callback
2127 * This function can be used to iterate over all the live objects in the heap:
2128 * for each object, @callback is invoked, providing info about the object's
2129 * location in memory, its class, its size and the objects it references.
2130 * For each referenced object it's offset from the object address is
2131 * reported in the offsets array.
2132 * The object references may be buffered, so the callback may be invoked
2133 * multiple times for the same object: in all but the first call, the size
2134 * argument will be zero.
2135 * Note that this function can be only called in the #MONO_GC_EVENT_PRE_START_WORLD
2136 * profiler event handler.
2138 * Returns: a non-zero value if the GC doesn't support heap walking
2141 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
2146 hwi.callback = callback;
2149 sgen_clear_nursery_fragments ();
2150 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data, walk_references, &hwi, FALSE, TRUE);
2152 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, walk_references, &hwi);
2153 sgen_los_iterate_objects (walk_references, &hwi);
2163 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
2165 gc_callbacks = *callbacks;
2169 mono_gc_get_gc_callbacks ()
2171 return &gc_callbacks;
2175 sgen_client_thread_register (SgenThreadInfo* info, void *stack_bottom_fallback)
2178 guint8 *staddr = NULL;
2180 #ifndef HAVE_KW_THREAD
2181 g_assert (!mono_native_tls_get_value (thread_info_key));
2182 mono_native_tls_set_value (thread_info_key, info);
2184 sgen_thread_info = info;
2187 info->client_info.skip = 0;
2188 info->client_info.stopped_ip = NULL;
2189 info->client_info.stopped_domain = NULL;
2191 info->client_info.stack_start = NULL;
2193 #ifdef SGEN_POSIX_STW
2194 info->client_info.stop_count = -1;
2195 info->client_info.signal = 0;
2198 /* On win32, stack_start_limit should be 0, since the stack can grow dynamically */
2199 mono_thread_info_get_stack_bounds (&staddr, &stsize);
2202 info->client_info.stack_start_limit = staddr;
2204 info->client_info.stack_end = staddr + stsize;
2206 gsize stack_bottom = (gsize)stack_bottom_fallback;
2207 stack_bottom += 4095;
2208 stack_bottom &= ~4095;
2209 info->client_info.stack_end = (char*)stack_bottom;
2213 memset (&info->client_info.ctx, 0, sizeof (MonoContext));
2215 memset (&info->client_info.regs, 0, sizeof (info->client_info.regs));
2218 if (mono_gc_get_gc_callbacks ()->thread_attach_func)
2219 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2221 binary_protocol_thread_register ((gpointer)mono_thread_info_get_tid (info));
2223 SGEN_LOG (3, "registered thread %p (%p) stack end %p", info, (gpointer)mono_thread_info_get_tid (info), info->client_info.stack_end);
2227 sgen_client_thread_unregister (SgenThreadInfo *p)
2229 MonoNativeThreadId tid;
2231 #ifndef HAVE_KW_THREAD
2232 mono_native_tls_set_value (thread_info_key, NULL);
2234 sgen_thread_info = NULL;
2237 tid = mono_thread_info_get_tid (p);
2239 if (p->client_info.info.runtime_thread)
2240 mono_threads_add_joinable_thread ((gpointer)tid);
2242 if (mono_gc_get_gc_callbacks ()->thread_detach_func) {
2243 mono_gc_get_gc_callbacks ()->thread_detach_func (p->client_info.runtime_data);
2244 p->client_info.runtime_data = NULL;
2247 binary_protocol_thread_unregister ((gpointer)tid);
2248 SGEN_LOG (3, "unregister thread %p (%p)", p, (gpointer)tid);
2252 mono_gc_set_skip_thread (gboolean skip)
2254 SgenThreadInfo *info = mono_thread_info_current ();
2257 info->client_info.gc_disabled = skip;
2262 is_critical_method (MonoMethod *method)
2264 return mono_runtime_is_critical_method (method) || sgen_is_critical_method (method);
2268 thread_in_critical_region (SgenThreadInfo *info)
2270 return info->client_info.in_critical_region;
2274 sgen_thread_attach (SgenThreadInfo *info)
2276 if (mono_gc_get_gc_callbacks ()->thread_attach_func && !info->client_info.runtime_data)
2277 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2281 sgen_thread_detach (SgenThreadInfo *p)
2283 /* If a delegate is passed to native code and invoked on a thread we dont
2284 * know about, the jit will register it with mono_jit_thread_attach, but
2285 * we have no way of knowing when that thread goes away. SGen has a TSD
2286 * so we assume that if the domain is still registered, we can detach
2289 if (mono_domain_get ())
2290 mono_thread_detach_internal (mono_thread_internal_current ());
2294 mono_gc_register_thread (void *baseptr)
2296 return mono_thread_info_attach (baseptr) != NULL;
2300 mono_gc_is_gc_thread (void)
2304 result = mono_thread_info_current () != NULL;
2310 sgen_client_thread_register_worker (void)
2312 mono_thread_info_register_small_id ();
2315 /* Variables holding start/end nursery so it won't have to be passed at every call */
2316 static void *scan_area_arg_start, *scan_area_arg_end;
2319 mono_gc_conservatively_scan_area (void *start, void *end)
2321 sgen_conservatively_pin_objects_from ((void **)start, (void **)end, scan_area_arg_start, scan_area_arg_end, PIN_TYPE_STACK);
2325 mono_gc_scan_object (void *obj, void *gc_data)
2327 ScanCopyContext *ctx = (ScanCopyContext *)gc_data;
2328 ctx->ops->copy_or_mark_object ((GCObject**)&obj, ctx->queue);
2333 * Mark from thread stacks and registers.
2336 sgen_client_scan_thread_data (void *start_nursery, void *end_nursery, gboolean precise, ScanCopyContext ctx)
2338 SgenThreadInfo *info;
2340 scan_area_arg_start = start_nursery;
2341 scan_area_arg_end = end_nursery;
2343 FOREACH_THREAD (info) {
2344 int skip_reason = 0;
2345 void *aligned_stack_start = (void*)(mword) ALIGN_TO ((mword)info->client_info.stack_start, SIZEOF_VOID_P);
2347 if (info->client_info.skip) {
2348 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);
2350 } else if (info->client_info.gc_disabled) {
2351 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);
2353 } else if (!mono_thread_info_is_live (info)) {
2354 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);
2358 binary_protocol_scan_stack ((gpointer)mono_thread_info_get_tid (info), info->client_info.stack_start, info->client_info.stack_end, skip_reason);
2363 g_assert (info->client_info.suspend_done);
2364 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 ());
2365 if (mono_gc_get_gc_callbacks ()->thread_mark_func && !conservative_stack_mark) {
2366 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);
2367 } else if (!precise) {
2368 if (!conservative_stack_mark) {
2369 fprintf (stderr, "Precise stack mark not supported - disabling.\n");
2370 conservative_stack_mark = TRUE;
2372 sgen_conservatively_pin_objects_from ((void **)aligned_stack_start, (void **)info->client_info.stack_end, start_nursery, end_nursery, PIN_TYPE_STACK);
2377 sgen_conservatively_pin_objects_from ((void**)&info->client_info.ctx, (void**)&info->client_info.ctx + ARCH_NUM_REGS,
2378 start_nursery, end_nursery, PIN_TYPE_STACK);
2380 sgen_conservatively_pin_objects_from ((void**)&info->client_info.regs, (void**)&info->client_info.regs + ARCH_NUM_REGS,
2381 start_nursery, end_nursery, PIN_TYPE_STACK);
2384 // This is used on Coop GC for platforms where we cannot get the data for individual registers.
2385 // We force a spill of all registers into the stack and pass a chunk of data into sgen.
2386 MonoThreadUnwindState *state = &info->client_info.info.thread_saved_state [SELF_SUSPEND_STATE_INDEX];
2387 if (state && state->gc_stackdata) {
2388 sgen_conservatively_pin_objects_from ((void **)state->gc_stackdata, (void**)((char*)state->gc_stackdata + state->gc_stackdata_size),
2389 start_nursery, end_nursery, PIN_TYPE_STACK);
2393 } END_FOREACH_THREAD
2397 * mono_gc_set_stack_end:
2399 * Set the end of the current threads stack to STACK_END. The stack space between
2400 * STACK_END and the real end of the threads stack will not be scanned during collections.
2403 mono_gc_set_stack_end (void *stack_end)
2405 SgenThreadInfo *info;
2408 info = mono_thread_info_current ();
2410 SGEN_ASSERT (0, stack_end < info->client_info.stack_end, "Can only lower stack end");
2411 info->client_info.stack_end = stack_end;
2421 mono_gc_register_root (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2423 return sgen_register_root (start, size, descr, descr ? ROOT_TYPE_NORMAL : ROOT_TYPE_PINNED, source, msg);
2427 mono_gc_register_root_wbarrier (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2429 return sgen_register_root (start, size, descr, ROOT_TYPE_WBARRIER, source, msg);
2433 mono_gc_deregister_root (char* addr)
2435 sgen_deregister_root (addr);
2444 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
2446 return pthread_create (new_thread, attr, start_routine, arg);
2455 sgen_client_total_allocated_heap_changed (size_t allocated_heap)
2457 mono_runtime_resource_check_limit (MONO_RESOURCE_GC_HEAP, allocated_heap);
2461 mono_gc_user_markers_supported (void)
2467 mono_object_is_alive (MonoObject* o)
2473 mono_gc_get_generation (MonoObject *obj)
2475 if (sgen_ptr_in_nursery (obj))
2481 mono_gc_enable_events (void)
2486 mono_gc_get_gc_name (void)
2492 mono_gc_get_description (void)
2494 return g_strdup ("sgen");
2498 mono_gc_set_desktop_mode (void)
2503 mono_gc_is_moving (void)
2509 mono_gc_is_disabled (void)
2515 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
2522 mono_gc_max_generation (void)
2528 mono_gc_precise_stack_mark_enabled (void)
2530 return !conservative_stack_mark;
2534 mono_gc_collect (int generation)
2536 sgen_gc_collect (generation);
2540 mono_gc_collection_count (int generation)
2542 return sgen_gc_collection_count (generation);
2546 mono_gc_get_used_size (void)
2548 return (int64_t)sgen_gc_get_used_size ();
2552 mono_gc_get_heap_size (void)
2554 return (int64_t)sgen_gc_get_total_heap_allocation ();
2558 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
2560 return sgen_make_user_root_descriptor (marker);
2564 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
2566 return SGEN_DESC_STRING;
2570 mono_gc_get_nursery (int *shift_bits, size_t *size)
2572 *size = sgen_nursery_size;
2573 *shift_bits = DEFAULT_NURSERY_BITS;
2574 return sgen_get_nursery_start ();
2578 mono_gc_get_los_limit (void)
2580 return SGEN_MAX_SMALL_OBJ_SIZE;
2584 sgen_client_default_metadata (void)
2586 return mono_domain_get ();
2590 sgen_client_metadata_for_object (GCObject *obj)
2592 return mono_object_domain (obj);
2596 * mono_gchandle_is_in_domain:
2597 * @gchandle: a GCHandle's handle.
2598 * @domain: An application domain.
2600 * Returns: true if the object wrapped by the @gchandle belongs to the specific @domain.
2603 mono_gchandle_is_in_domain (guint32 gchandle, MonoDomain *domain)
2605 MonoDomain *gchandle_domain = (MonoDomain *)sgen_gchandle_get_metadata (gchandle);
2606 return domain->domain_id == gchandle_domain->domain_id;
2610 * mono_gchandle_free_domain:
2611 * @unloading: domain that is unloading
2613 * Function used internally to cleanup any GC handle for objects belonging
2614 * to the specified domain during appdomain unload.
2617 mono_gchandle_free_domain (MonoDomain *unloading)
2622 null_link_if_in_domain (gpointer hidden, GCHandleType handle_type, int max_generation, gpointer user)
2624 MonoDomain *unloading_domain = (MonoDomain *)user;
2625 MonoDomain *obj_domain;
2626 gboolean is_weak = MONO_GC_HANDLE_TYPE_IS_WEAK (handle_type);
2627 if (MONO_GC_HANDLE_IS_OBJECT_POINTER (hidden)) {
2628 MonoObject *obj = (MonoObject *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2629 obj_domain = mono_object_domain (obj);
2631 obj_domain = (MonoDomain *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2633 if (unloading_domain->domain_id == obj_domain->domain_id)
2639 sgen_null_links_for_domain (MonoDomain *domain)
2642 for (type = HANDLE_TYPE_MIN; type < HANDLE_TYPE_MAX; ++type)
2643 sgen_gchandle_iterate ((GCHandleType)type, GENERATION_OLD, null_link_if_in_domain, domain);
2647 mono_gchandle_set_target (guint32 gchandle, MonoObject *obj)
2649 sgen_gchandle_set_target (gchandle, obj);
2653 sgen_client_gchandle_created (int handle_type, GCObject *obj, guint32 handle)
2655 #ifndef DISABLE_PERFCOUNTERS
2656 mono_perfcounters->gc_num_handles++;
2658 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_CREATED, handle_type, handle, obj);
2662 sgen_client_gchandle_destroyed (int handle_type, guint32 handle)
2664 #ifndef DISABLE_PERFCOUNTERS
2665 mono_perfcounters->gc_num_handles--;
2667 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_DESTROYED, handle_type, handle, NULL);
2671 sgen_client_ensure_weak_gchandles_accessible (void)
2674 * During the second bridge processing step the world is
2675 * running again. That step processes all weak links once
2676 * more to null those that refer to dead objects. Before that
2677 * is completed, those links must not be followed, so we
2678 * conservatively wait for bridge processing when any weak
2679 * link is dereferenced.
2681 /* FIXME: A GC can occur after this check fails, in which case we
2682 * should wait for bridge processing but would fail to do so.
2684 if (G_UNLIKELY (bridge_processing_in_progress))
2685 mono_gc_wait_for_bridge_processing ();
2689 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
2693 result = func (data);
2694 UNLOCK_INTERRUPTION;
2699 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
2705 sgen_client_out_of_memory (size_t size)
2707 mono_gc_out_of_memory (size);
2711 mono_gc_get_card_table (int *shift_bits, gpointer *mask)
2713 return sgen_get_card_table_configuration (shift_bits, mask);
2717 mono_gc_card_table_nursery_check (void)
2719 return !sgen_get_major_collector ()->is_concurrent;
2722 /* Negative value to remove */
2724 mono_gc_add_memory_pressure (gint64 value)
2726 /* FIXME: Implement at some point? */
2734 sgen_client_degraded_allocation (size_t size)
2736 static int last_major_gc_warned = -1;
2737 static int num_degraded = 0;
2739 if (last_major_gc_warned < gc_stats.major_gc_count) {
2741 if (num_degraded == 1 || num_degraded == 3)
2742 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Degraded allocation. Consider increasing nursery-size if the warning persists.");
2743 else if (num_degraded == 10)
2744 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Repeated degraded allocation. Consider increasing nursery-size.");
2745 last_major_gc_warned = gc_stats.major_gc_count;
2750 sgen_client_log_timing (GGTimingInfo *info, mword last_major_num_sections, mword last_los_memory_usage)
2752 SgenMajorCollector *major_collector = sgen_get_major_collector ();
2753 mword num_major_sections = major_collector->get_num_major_sections ();
2754 char full_timing_buff [1024];
2755 full_timing_buff [0] = '\0';
2757 if (!info->is_overflow)
2758 sprintf (full_timing_buff, "total %.2fms, bridge %.2fms", info->stw_time / 10000.0f, (int)info->bridge_time / 10000.0f);
2759 if (info->generation == GENERATION_OLD)
2760 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "GC_MAJOR%s: (%s) pause %.2fms, %s major %dK/%dK los %dK/%dK",
2761 info->is_overflow ? "_OVERFLOW" : "",
2762 info->reason ? info->reason : "",
2763 (int)info->total_time / 10000.0f,
2765 major_collector->section_size * num_major_sections / 1024,
2766 major_collector->section_size * last_major_num_sections / 1024,
2767 los_memory_usage / 1024,
2768 last_los_memory_usage / 1024);
2770 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "GC_MINOR%s: (%s) pause %.2fms, %s promoted %dK major %dK los %dK",
2771 info->is_overflow ? "_OVERFLOW" : "",
2772 info->reason ? info->reason : "",
2773 (int)info->total_time / 10000.0f,
2775 (num_major_sections - last_major_num_sections) * major_collector->section_size / 1024,
2776 major_collector->section_size * num_major_sections / 1024,
2777 los_memory_usage / 1024);
2785 sgen_client_description_for_internal_mem_type (int type)
2788 case INTERNAL_MEM_EPHEMERON_LINK: return "ephemeron-link";
2795 sgen_client_pre_collection_checks (void)
2797 if (sgen_mono_xdomain_checks) {
2798 sgen_clear_nursery_fragments ();
2799 sgen_check_for_xdomain_refs ();
2804 sgen_client_vtable_is_inited (MonoVTable *vt)
2806 return vt->klass->inited;
2810 sgen_client_vtable_get_namespace (MonoVTable *vt)
2812 return vt->klass->name_space;
2816 sgen_client_vtable_get_name (MonoVTable *vt)
2818 return vt->klass->name;
2826 sgen_client_init (void)
2829 MonoThreadInfoCallbacks cb;
2831 cb.thread_register = sgen_thread_register;
2832 cb.thread_detach = sgen_thread_detach;
2833 cb.thread_unregister = sgen_thread_unregister;
2834 cb.thread_attach = sgen_thread_attach;
2835 cb.mono_method_is_critical = (gboolean (*)(void *))is_critical_method;
2836 cb.mono_thread_in_critical_region = thread_in_critical_region;
2838 mono_threads_init (&cb, sizeof (SgenThreadInfo));
2840 ///* Keep this the default for now */
2841 /* Precise marking is broken on all supported targets. Disable until fixed. */
2842 conservative_stack_mark = TRUE;
2844 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_EPHEMERON_LINK, sizeof (EphemeronLinkNode));
2846 mono_sgen_init_stw ();
2848 #ifndef HAVE_KW_THREAD
2849 mono_native_tls_alloc (&thread_info_key, NULL);
2850 #if defined(TARGET_OSX) || defined(TARGET_WIN32) || defined(TARGET_ANDROID) || defined(TARGET_IOS)
2852 * CEE_MONO_TLS requires the tls offset, not the key, so the code below only works on darwin,
2853 * where the two are the same.
2855 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO, thread_info_key);
2859 int tls_offset = -1;
2860 MONO_THREAD_VAR_OFFSET (sgen_thread_info, tls_offset);
2861 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO, tls_offset);
2866 * This needs to happen before any internal allocations because
2867 * it inits the small id which is required for hazard pointer
2872 mono_gc_register_thread (&dummy);
2876 sgen_client_handle_gc_param (const char *opt)
2878 if (g_str_has_prefix (opt, "stack-mark=")) {
2879 opt = strchr (opt, '=') + 1;
2880 if (!strcmp (opt, "precise")) {
2881 conservative_stack_mark = FALSE;
2882 } else if (!strcmp (opt, "conservative")) {
2883 conservative_stack_mark = TRUE;
2885 sgen_env_var_error (MONO_GC_PARAMS_NAME, conservative_stack_mark ? "Using `conservative`." : "Using `precise`.",
2886 "Invalid value `%s` for `stack-mark` option, possible values are: `precise`, `conservative`.", opt);
2888 } else if (g_str_has_prefix (opt, "bridge-implementation=")) {
2889 opt = strchr (opt, '=') + 1;
2890 sgen_set_bridge_implementation (opt);
2891 } else if (g_str_has_prefix (opt, "toggleref-test")) {
2892 /* FIXME: This should probably in MONO_GC_DEBUG */
2893 sgen_register_test_toggleref_callback ();
2901 sgen_client_print_gc_params_usage (void)
2903 fprintf (stderr, " stack-mark=MARK-METHOD (where MARK-METHOD is 'precise' or 'conservative')\n");
2907 sgen_client_handle_gc_debug (const char *opt)
2909 if (!strcmp (opt, "xdomain-checks")) {
2910 sgen_mono_xdomain_checks = TRUE;
2911 } else if (!strcmp (opt, "do-not-finalize")) {
2912 mono_do_not_finalize = TRUE;
2913 } else if (g_str_has_prefix (opt, "do-not-finalize=")) {
2914 opt = strchr (opt, '=') + 1;
2915 mono_do_not_finalize = TRUE;
2916 mono_do_not_finalize_class_names = g_strsplit (opt, ",", 0);
2917 } else if (!strcmp (opt, "log-finalizers")) {
2918 log_finalizers = TRUE;
2919 } else if (!strcmp (opt, "no-managed-allocator")) {
2920 sgen_set_use_managed_allocator (FALSE);
2921 } else if (!sgen_bridge_handle_gc_debug (opt)) {
2928 sgen_client_print_gc_debug_usage (void)
2930 fprintf (stderr, " xdomain-checks\n");
2931 fprintf (stderr, " do-not-finalize\n");
2932 fprintf (stderr, " log-finalizers\n");
2933 fprintf (stderr, " no-managed-allocator\n");
2934 sgen_bridge_print_gc_debug_usage ();
2939 sgen_client_get_provenance (void)
2941 #ifdef SGEN_OBJECT_PROVENANCE
2942 MonoGCCallbacks *cb = mono_gc_get_gc_callbacks ();
2943 gpointer (*get_provenance_func) (void);
2946 get_provenance_func = cb->get_provenance_func;
2947 if (get_provenance_func)
2948 return get_provenance_func ();
2956 sgen_client_describe_invalid_pointer (GCObject *ptr)
2958 sgen_bridge_describe_pointer (ptr);
2962 mono_gc_base_init (void)
2964 mono_counters_init ();
2966 #ifdef HEAVY_STATISTICS
2967 mono_counters_register ("los marked cards", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_marked_cards);
2968 mono_counters_register ("los array cards scanned ", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_cards);
2969 mono_counters_register ("los array remsets", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_remsets);
2971 mono_counters_register ("WBarrier set arrayref", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_set_arrayref);
2972 mono_counters_register ("WBarrier value copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_value_copy);
2973 mono_counters_register ("WBarrier object copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_object_copy);
2978 if (nursery_canaries_enabled ())
2979 sgen_set_use_managed_allocator (FALSE);
2983 mono_gc_base_cleanup (void)
2988 mono_gc_is_null (void)