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 "metadata/handle.h"
38 #include "utils/mono-memory-model.h"
39 #include "utils/mono-logger-internals.h"
41 #ifdef HEAVY_STATISTICS
42 static guint64 stat_wbarrier_set_arrayref = 0;
43 static guint64 stat_wbarrier_value_copy = 0;
44 static guint64 stat_wbarrier_object_copy = 0;
46 static guint64 los_marked_cards;
47 static guint64 los_array_cards;
48 static guint64 los_array_remsets;
51 /* If set, mark stacks conservatively, even if precise marking is possible */
52 static gboolean conservative_stack_mark = FALSE;
53 /* If set, check that there are no references to the domain left at domain unload */
54 gboolean sgen_mono_xdomain_checks = FALSE;
56 /* Functions supplied by the runtime to be called by the GC */
57 static MonoGCCallbacks gc_callbacks;
60 __thread SgenThreadInfo *sgen_thread_info;
62 MonoNativeTlsKey thread_info_key;
65 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
67 #define OPDEF(a,b,c,d,e,f,g,h,i,j) \
71 #include "mono/cil/opcode.def"
82 ptr_on_stack (void *ptr)
84 gpointer stack_start = &stack_start;
85 SgenThreadInfo *info = mono_thread_info_current ();
87 if (ptr >= stack_start && ptr < (gpointer)info->client_info.stack_end)
92 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
94 #define HANDLE_PTR(ptr,obj) do { \
95 gpointer o = *(gpointer*)(ptr); \
97 gpointer d = ((char*)dest) + ((char*)(ptr) - (char*)(obj)); \
98 binary_protocol_wbarrier (d, o, (gpointer) SGEN_LOAD_VTABLE (o)); \
103 scan_object_for_binary_protocol_copy_wbarrier (gpointer dest, char *start, mword desc)
105 #define SCAN_OBJECT_NOVTABLE
106 #include "sgen/sgen-scan-object.h"
111 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
113 HEAVY_STAT (++stat_wbarrier_value_copy);
114 g_assert (klass->valuetype);
116 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);
118 if (sgen_ptr_in_nursery (dest) || ptr_on_stack (dest) || !sgen_gc_descr_has_references ((mword)klass->gc_descr)) {
119 size_t element_size = mono_class_value_size (klass, NULL);
120 size_t size = count * element_size;
121 mono_gc_memmove_atomic (dest, src, size);
125 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
126 if (binary_protocol_is_heavy_enabled ()) {
127 size_t element_size = mono_class_value_size (klass, NULL);
129 for (i = 0; i < count; ++i) {
130 scan_object_for_binary_protocol_copy_wbarrier ((char*)dest + i * element_size,
131 (char*)src + i * element_size - sizeof (MonoObject),
132 (mword) klass->gc_descr);
137 sgen_get_remset ()->wbarrier_value_copy (dest, src, count, mono_class_value_size (klass, NULL));
141 * mono_gc_wbarrier_object_copy:
143 * Write barrier to call when obj is the result of a clone or copy of an object.
146 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
150 HEAVY_STAT (++stat_wbarrier_object_copy);
152 if (sgen_ptr_in_nursery (obj) || ptr_on_stack (obj) || !SGEN_OBJECT_HAS_REFERENCES (src)) {
153 size = mono_object_class (obj)->instance_size;
154 mono_gc_memmove_aligned ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
155 size - sizeof (MonoObject));
159 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
160 if (binary_protocol_is_heavy_enabled ())
161 scan_object_for_binary_protocol_copy_wbarrier (obj, (char*)src, (mword) src->vtable->gc_descr);
164 sgen_get_remset ()->wbarrier_object_copy (obj, src);
168 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
170 HEAVY_STAT (++stat_wbarrier_set_arrayref);
171 if (sgen_ptr_in_nursery (slot_ptr)) {
172 *(void**)slot_ptr = value;
175 SGEN_LOG (8, "Adding remset at %p", slot_ptr);
177 binary_protocol_wbarrier (slot_ptr, value, value->vtable);
179 sgen_get_remset ()->wbarrier_set_field ((GCObject*)arr, slot_ptr, value);
183 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
185 mono_gc_wbarrier_set_arrayref ((MonoArray*)obj, field_ptr, value);
189 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
191 sgen_wbarrier_value_copy_bitmap (_dest, _src, size, bitmap);
194 static MonoMethod *write_barrier_conc_method;
195 static MonoMethod *write_barrier_noconc_method;
198 sgen_is_critical_method (MonoMethod *method)
200 return (method == write_barrier_conc_method || method == write_barrier_noconc_method || sgen_is_managed_allocator (method));
204 sgen_has_critical_method (void)
206 return write_barrier_conc_method || write_barrier_noconc_method || sgen_has_managed_allocator ();
212 emit_nursery_check (MonoMethodBuilder *mb, int *nursery_check_return_labels, gboolean is_concurrent)
214 int shifted_nursery_start = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
216 memset (nursery_check_return_labels, 0, sizeof (int) * 2);
217 // if (ptr_in_nursery (ptr)) return;
219 * Masking out the bits might be faster, but we would have to use 64 bit
220 * immediates, which might be slower.
222 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
223 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_START);
224 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
225 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
226 mono_mb_emit_byte (mb, CEE_SHR_UN);
227 mono_mb_emit_stloc (mb, shifted_nursery_start);
229 mono_mb_emit_ldarg (mb, 0);
230 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
231 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
232 mono_mb_emit_byte (mb, CEE_SHR_UN);
233 mono_mb_emit_ldloc (mb, shifted_nursery_start);
234 nursery_check_return_labels [0] = mono_mb_emit_branch (mb, CEE_BEQ);
236 if (!is_concurrent) {
237 // if (!ptr_in_nursery (*ptr)) return;
238 mono_mb_emit_ldarg (mb, 0);
239 mono_mb_emit_byte (mb, CEE_LDIND_I);
240 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
241 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
242 mono_mb_emit_byte (mb, CEE_SHR_UN);
243 mono_mb_emit_ldloc (mb, shifted_nursery_start);
244 nursery_check_return_labels [1] = mono_mb_emit_branch (mb, CEE_BNE_UN);
250 mono_gc_get_specific_write_barrier (gboolean is_concurrent)
253 MonoMethodBuilder *mb;
254 MonoMethodSignature *sig;
255 MonoMethod **write_barrier_method_addr;
257 #ifdef MANAGED_WBARRIER
258 int i, nursery_check_labels [2];
261 // FIXME: Maybe create a separate version for ctors (the branch would be
262 // correctly predicted more times)
264 write_barrier_method_addr = &write_barrier_conc_method;
266 write_barrier_method_addr = &write_barrier_noconc_method;
268 if (*write_barrier_method_addr)
269 return *write_barrier_method_addr;
271 /* Create the IL version of mono_gc_barrier_generic_store () */
272 sig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
273 sig->ret = &mono_defaults.void_class->byval_arg;
274 sig->params [0] = &mono_defaults.int_class->byval_arg;
277 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_conc", MONO_WRAPPER_WRITE_BARRIER);
279 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_noconc", MONO_WRAPPER_WRITE_BARRIER);
282 #ifdef MANAGED_WBARRIER
283 emit_nursery_check (mb, nursery_check_labels, is_concurrent);
285 addr = sgen_cardtable + ((address >> CARD_BITS) & CARD_MASK)
289 LDC_PTR sgen_cardtable
295 if (SGEN_HAVE_OVERLAPPING_CARDS) {
296 LDC_PTR card_table_mask
303 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
304 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_CARD_TABLE);
305 mono_mb_emit_ldarg (mb, 0);
306 mono_mb_emit_icon (mb, CARD_BITS);
307 mono_mb_emit_byte (mb, CEE_SHR_UN);
308 mono_mb_emit_byte (mb, CEE_CONV_I);
309 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
310 #if SIZEOF_VOID_P == 8
311 mono_mb_emit_icon8 (mb, CARD_MASK);
313 mono_mb_emit_icon (mb, CARD_MASK);
315 mono_mb_emit_byte (mb, CEE_CONV_I);
316 mono_mb_emit_byte (mb, CEE_AND);
318 mono_mb_emit_byte (mb, CEE_ADD);
319 mono_mb_emit_icon (mb, 1);
320 mono_mb_emit_byte (mb, CEE_STIND_I1);
323 for (i = 0; i < 2; ++i) {
324 if (nursery_check_labels [i])
325 mono_mb_patch_branch (mb, nursery_check_labels [i]);
327 mono_mb_emit_byte (mb, CEE_RET);
329 mono_mb_emit_ldarg (mb, 0);
330 mono_mb_emit_icall (mb, mono_gc_wbarrier_generic_nostore);
331 mono_mb_emit_byte (mb, CEE_RET);
334 res = mono_mb_create_method (mb, sig, 16);
335 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
336 mono_marshal_set_wrapper_info (res, info);
340 if (*write_barrier_method_addr) {
341 /* Already created */
342 mono_free_method (res);
344 /* double-checked locking */
345 mono_memory_barrier ();
346 *write_barrier_method_addr = res;
350 return *write_barrier_method_addr;
354 mono_gc_get_write_barrier (void)
356 return mono_gc_get_specific_write_barrier (major_collector.is_concurrent);
360 * Dummy filler objects
363 /* Vtable of the objects used to fill out nursery fragments before a collection */
364 static GCVTable array_fill_vtable;
367 get_array_fill_vtable (void)
369 if (!array_fill_vtable) {
370 static MonoClass klass;
371 static char _vtable[sizeof(MonoVTable)+8];
372 MonoVTable* vtable = (MonoVTable*) ALIGN_TO((mword)_vtable, 8);
375 MonoDomain *domain = mono_get_root_domain ();
378 klass.element_class = mono_defaults.byte_class;
380 klass.instance_size = MONO_SIZEOF_MONO_ARRAY;
381 klass.sizes.element_size = 1;
382 klass.name = "array_filler_type";
384 vtable->klass = &klass;
386 vtable->gc_descr = mono_gc_make_descr_for_array (TRUE, &bmap, 0, 1);
389 array_fill_vtable = vtable;
391 return array_fill_vtable;
395 sgen_client_array_fill_range (char *start, size_t size)
399 if (size < MONO_SIZEOF_MONO_ARRAY) {
400 memset (start, 0, size);
404 o = (MonoArray*)start;
405 o->obj.vtable = (MonoVTable*)get_array_fill_vtable ();
406 /* Mark this as not a real object */
407 o->obj.synchronisation = (MonoThreadsSync *)GINT_TO_POINTER (-1);
409 o->max_length = (mono_array_size_t)(size - MONO_SIZEOF_MONO_ARRAY);
415 sgen_client_zero_array_fill_header (void *p, size_t size)
417 if (size >= MONO_SIZEOF_MONO_ARRAY) {
418 memset (p, 0, MONO_SIZEOF_MONO_ARRAY);
420 static guint8 zeros [MONO_SIZEOF_MONO_ARRAY];
422 SGEN_ASSERT (0, !memcmp (p, zeros, size), "TLAB segment must be zeroed out.");
430 static MonoGCFinalizerCallbacks fin_callbacks;
433 mono_gc_get_vtable_bits (MonoClass *klass)
436 /* FIXME move this to the bridge code */
437 if (sgen_need_bridge_processing ()) {
438 switch (sgen_bridge_class_kind (klass)) {
439 case GC_BRIDGE_TRANSPARENT_BRIDGE_CLASS:
440 case GC_BRIDGE_OPAQUE_BRIDGE_CLASS:
441 res = SGEN_GC_BIT_BRIDGE_OBJECT;
443 case GC_BRIDGE_OPAQUE_CLASS:
444 res = SGEN_GC_BIT_BRIDGE_OPAQUE_OBJECT;
446 case GC_BRIDGE_TRANSPARENT_CLASS:
450 if (fin_callbacks.is_class_finalization_aware) {
451 if (fin_callbacks.is_class_finalization_aware (klass))
452 res |= SGEN_GC_BIT_FINALIZER_AWARE;
458 is_finalization_aware (MonoObject *obj)
460 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
461 return (vt->gc_bits & SGEN_GC_BIT_FINALIZER_AWARE) == SGEN_GC_BIT_FINALIZER_AWARE;
465 sgen_client_object_queued_for_finalization (GCObject *obj)
467 if (fin_callbacks.object_queued_for_finalization && is_finalization_aware (obj))
468 fin_callbacks.object_queued_for_finalization (obj);
471 if (G_UNLIKELY (MONO_GC_FINALIZE_ENQUEUE_ENABLED ())) {
472 int gen = sgen_ptr_in_nursery (obj) ? GENERATION_NURSERY : GENERATION_OLD;
473 GCVTable vt = SGEN_LOAD_VTABLE (obj);
474 MONO_GC_FINALIZE_ENQUEUE ((mword)obj, sgen_safe_object_get_size (obj),
475 sgen_client_vtable_get_namespace (vt), sgen_client_vtable_get_name (vt), gen,
476 sgen_client_object_has_critical_finalizer (obj));
482 mono_gc_register_finalizer_callbacks (MonoGCFinalizerCallbacks *callbacks)
484 if (callbacks->version != MONO_GC_FINALIZER_EXTENSION_VERSION)
485 g_error ("Invalid finalizer callback version. Expected %d but got %d\n", MONO_GC_FINALIZER_EXTENSION_VERSION, callbacks->version);
487 fin_callbacks = *callbacks;
491 sgen_client_run_finalize (MonoObject *obj)
493 mono_gc_run_finalize (obj, NULL);
497 mono_gc_invoke_finalizers (void)
499 return sgen_gc_invoke_finalizers ();
503 mono_gc_pending_finalizers (void)
505 return sgen_have_pending_finalizers ();
509 sgen_client_finalize_notify (void)
511 mono_gc_finalize_notify ();
515 mono_gc_register_for_finalization (MonoObject *obj, void *user_data)
517 sgen_object_register_for_finalization (obj, user_data);
521 object_in_domain_predicate (MonoObject *obj, void *user_data)
523 MonoDomain *domain = (MonoDomain *)user_data;
524 if (mono_object_domain (obj) == domain) {
525 SGEN_LOG (5, "Unregistering finalizer for object: %p (%s)", obj, sgen_client_vtable_get_name (SGEN_LOAD_VTABLE (obj)));
532 * mono_gc_finalizers_for_domain:
533 * @domain: the unloading appdomain
534 * @out_array: output array
535 * @out_size: size of output array
537 * Store inside @out_array up to @out_size objects that belong to the unloading
538 * appdomain @domain. Returns the number of stored items. Can be called repeteadly
539 * until it returns 0.
540 * The items are removed from the finalizer data structure, so the caller is supposed
542 * @out_array should be on the stack to allow the GC to know the objects are still alive.
545 mono_gc_finalizers_for_domain (MonoDomain *domain, MonoObject **out_array, int out_size)
547 return sgen_gather_finalizers_if (object_in_domain_predicate, domain, out_array, out_size);
554 typedef struct _EphemeronLinkNode EphemeronLinkNode;
556 struct _EphemeronLinkNode {
557 EphemeronLinkNode *next;
566 static EphemeronLinkNode *ephemeron_list;
568 /* LOCKING: requires that the GC lock is held */
570 null_ephemerons_for_domain (MonoDomain *domain)
572 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
575 MonoObject *object = (MonoObject*)current->array;
578 SGEN_ASSERT (0, object->vtable, "Can't have objects without vtables.");
580 if (object && object->vtable->domain == domain) {
581 EphemeronLinkNode *tmp = current;
584 prev->next = current->next;
586 ephemeron_list = current->next;
588 current = current->next;
589 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
592 current = current->next;
597 /* LOCKING: requires that the GC lock is held */
599 sgen_client_clear_unreachable_ephemerons (ScanCopyContext ctx)
601 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
602 SgenGrayQueue *queue = ctx.queue;
603 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
604 Ephemeron *cur, *array_end;
608 MonoArray *array = current->array;
610 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
611 EphemeronLinkNode *tmp = current;
613 SGEN_LOG (5, "Dead Ephemeron array at %p", array);
616 prev->next = current->next;
618 ephemeron_list = current->next;
620 current = current->next;
621 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
626 copy_func ((GCObject**)&array, queue);
627 current->array = array;
629 SGEN_LOG (5, "Clearing unreachable entries for ephemeron array at %p", array);
631 cur = mono_array_addr (array, Ephemeron, 0);
632 array_end = cur + mono_array_length_fast (array);
633 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
635 for (; cur < array_end; ++cur) {
636 GCObject *key = cur->key;
638 if (!key || key == tombstone)
641 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
642 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
643 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
645 if (!sgen_is_object_alive_for_current_gen (key)) {
646 cur->key = tombstone;
652 current = current->next;
657 LOCKING: requires that the GC lock is held
659 Limitations: We scan all ephemerons on every collection since the current design doesn't allow for a simple nursery/mature split.
662 sgen_client_mark_ephemerons (ScanCopyContext ctx)
664 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
665 SgenGrayQueue *queue = ctx.queue;
666 gboolean nothing_marked = TRUE;
667 EphemeronLinkNode *current = ephemeron_list;
668 Ephemeron *cur, *array_end;
671 for (current = ephemeron_list; current; current = current->next) {
672 MonoArray *array = current->array;
673 SGEN_LOG (5, "Ephemeron array at %p", array);
675 /*It has to be alive*/
676 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
677 SGEN_LOG (5, "\tnot reachable");
681 copy_func ((GCObject**)&array, queue);
683 cur = mono_array_addr (array, Ephemeron, 0);
684 array_end = cur + mono_array_length_fast (array);
685 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
687 for (; cur < array_end; ++cur) {
688 GCObject *key = cur->key;
690 if (!key || key == tombstone)
693 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
694 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
695 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
697 if (sgen_is_object_alive_for_current_gen (key)) {
698 GCObject *value = cur->value;
700 copy_func (&cur->key, queue);
702 if (!sgen_is_object_alive_for_current_gen (value))
703 nothing_marked = FALSE;
704 copy_func (&cur->value, queue);
710 SGEN_LOG (5, "Ephemeron run finished. Is it done %d", nothing_marked);
711 return nothing_marked;
715 mono_gc_ephemeron_array_add (MonoObject *obj)
717 EphemeronLinkNode *node;
721 node = (EphemeronLinkNode *)sgen_alloc_internal (INTERNAL_MEM_EPHEMERON_LINK);
726 node->array = (MonoArray*)obj;
727 node->next = ephemeron_list;
728 ephemeron_list = node;
730 SGEN_LOG (5, "Registered ephemeron array %p", obj);
741 mono_gc_set_current_thread_appdomain (MonoDomain *domain)
743 SgenThreadInfo *info = mono_thread_info_current ();
745 /* Could be called from sgen_thread_unregister () with a NULL info */
748 info->client_info.stopped_domain = domain;
753 need_remove_object_for_domain (GCObject *start, MonoDomain *domain)
755 if (mono_object_domain (start) == domain) {
756 SGEN_LOG (4, "Need to cleanup object %p", start);
757 binary_protocol_cleanup (start, (gpointer)SGEN_LOAD_VTABLE (start), sgen_safe_object_get_size ((GCObject*)start));
764 process_object_for_domain_clearing (GCObject *start, MonoDomain *domain)
766 MonoVTable *vt = SGEN_LOAD_VTABLE (start);
767 if (vt->klass == mono_defaults.internal_thread_class)
768 g_assert (mono_object_domain (start) == mono_get_root_domain ());
769 /* The object could be a proxy for an object in the domain
771 #ifndef DISABLE_REMOTING
772 if (mono_defaults.real_proxy_class->supertypes && mono_class_has_parent_fast (vt->klass, mono_defaults.real_proxy_class)) {
773 MonoObject *server = ((MonoRealProxy*)start)->unwrapped_server;
775 /* The server could already have been zeroed out, so
776 we need to check for that, too. */
777 if (server && (!SGEN_LOAD_VTABLE (server) || mono_object_domain (server) == domain)) {
778 SGEN_LOG (4, "Cleaning up remote pointer in %p to object %p", start, server);
779 ((MonoRealProxy*)start)->unwrapped_server = NULL;
786 clear_domain_process_object (GCObject *obj, MonoDomain *domain)
790 process_object_for_domain_clearing (obj, domain);
791 remove = need_remove_object_for_domain (obj, domain);
793 if (remove && obj->synchronisation) {
794 guint32 dislink = mono_monitor_get_object_monitor_gchandle (obj);
796 mono_gchandle_free (dislink);
803 clear_domain_process_minor_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
805 if (clear_domain_process_object (obj, domain)) {
806 CANARIFY_SIZE (size);
807 memset (obj, 0, size);
812 clear_domain_process_major_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
814 clear_domain_process_object (obj, domain);
818 clear_domain_free_major_non_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
820 if (need_remove_object_for_domain (obj, domain))
821 major_collector.free_non_pinned_object (obj, size);
825 clear_domain_free_major_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
827 if (need_remove_object_for_domain (obj, domain))
828 major_collector.free_pinned_object (obj, size);
832 * When appdomains are unloaded we can easily remove objects that have finalizers,
833 * but all the others could still be present in random places on the heap.
834 * We need a sweep to get rid of them even though it's going to be costly
836 * The reason we need to remove them is because we access the vtable and class
837 * structures to know the object size and the reference bitmap: once the domain is
838 * unloaded the point to random memory.
841 mono_gc_clear_domain (MonoDomain * domain)
843 LOSObject *bigobj, *prev;
848 binary_protocol_domain_unload_begin (domain);
852 if (sgen_concurrent_collection_in_progress ())
853 sgen_perform_collection (0, GENERATION_OLD, "clear domain", TRUE);
854 SGEN_ASSERT (0, !sgen_concurrent_collection_in_progress (), "We just ordered a synchronous collection. Why are we collecting concurrently?");
856 major_collector.finish_sweeping ();
858 sgen_process_fin_stage_entries ();
860 sgen_clear_nursery_fragments ();
862 if (sgen_mono_xdomain_checks && domain != mono_get_root_domain ()) {
863 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_NORMAL);
864 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_WBARRIER);
865 sgen_check_for_xdomain_refs ();
868 /*Ephemerons and dislinks must be processed before LOS since they might end up pointing
869 to memory returned to the OS.*/
870 null_ephemerons_for_domain (domain);
871 sgen_null_links_for_domain (domain);
873 for (i = GENERATION_NURSERY; i < GENERATION_MAX; ++i)
874 sgen_remove_finalizers_if (object_in_domain_predicate, domain, i);
876 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
877 (IterateObjectCallbackFunc)clear_domain_process_minor_object_callback, domain, FALSE, TRUE);
879 /* We need two passes over major and large objects because
880 freeing such objects might give their memory back to the OS
881 (in the case of large objects) or obliterate its vtable
882 (pinned objects with major-copying or pinned and non-pinned
883 objects with major-mark&sweep), but we might need to
884 dereference a pointer from an object to another object if
885 the first object is a proxy. */
886 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, (IterateObjectCallbackFunc)clear_domain_process_major_object_callback, domain);
887 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
888 clear_domain_process_object ((GCObject*)bigobj->data, domain);
891 for (bigobj = los_object_list; bigobj;) {
892 if (need_remove_object_for_domain ((GCObject*)bigobj->data, domain)) {
893 LOSObject *to_free = bigobj;
895 prev->next = bigobj->next;
897 los_object_list = bigobj->next;
898 bigobj = bigobj->next;
899 SGEN_LOG (4, "Freeing large object %p", bigobj->data);
900 sgen_los_free_object (to_free);
904 bigobj = bigobj->next;
906 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_NON_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_non_pinned_object_callback, domain);
907 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_pinned_object_callback, domain);
909 if (domain == mono_get_root_domain ()) {
910 sgen_pin_stats_print_class_stats ();
911 sgen_object_layout_dump (stdout);
914 sgen_restart_world (0, NULL);
916 binary_protocol_domain_unload_end (domain);
917 binary_protocol_flush_buffers (FALSE);
926 static gboolean alloc_events = FALSE;
929 mono_gc_enable_alloc_events (void)
935 mono_gc_alloc_obj (MonoVTable *vtable, size_t size)
937 MonoObject *obj = sgen_alloc_obj (vtable, size);
939 if (G_UNLIKELY (alloc_events)) {
941 mono_profiler_allocation (obj);
948 mono_gc_alloc_pinned_obj (MonoVTable *vtable, size_t size)
950 MonoObject *obj = sgen_alloc_obj_pinned (vtable, size);
952 if (G_UNLIKELY (alloc_events)) {
954 mono_profiler_allocation (obj);
961 mono_gc_alloc_mature (MonoVTable *vtable, size_t size)
963 MonoObject *obj = sgen_alloc_obj_mature (vtable, size);
965 if (G_UNLIKELY (alloc_events)) {
967 mono_profiler_allocation (obj);
974 mono_gc_alloc_fixed (size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
976 /* FIXME: do a single allocation */
977 void *res = calloc (1, size);
980 if (!mono_gc_register_root ((char *)res, size, descr, source, msg)) {
988 mono_gc_free_fixed (void* addr)
990 mono_gc_deregister_root ((char *)addr);
998 static MonoMethod* alloc_method_cache [ATYPE_NUM];
999 static MonoMethod* slowpath_alloc_method_cache [ATYPE_NUM];
1000 static gboolean use_managed_allocator = TRUE;
1002 #ifdef MANAGED_ALLOCATION
1004 #ifdef HAVE_KW_THREAD
1006 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { \
1007 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1008 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1009 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_TLAB_NEXT_ADDR); \
1012 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { \
1013 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1014 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1015 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_TLAB_TEMP_END); \
1020 #if defined(TARGET_OSX) || defined(TARGET_WIN32) || defined(TARGET_ANDROID) || defined(TARGET_IOS)
1021 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { \
1022 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1023 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1024 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1025 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_next_addr)); \
1026 mono_mb_emit_byte ((mb), CEE_ADD); \
1027 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1030 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { \
1031 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1032 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1033 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1034 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_temp_end)); \
1035 mono_mb_emit_byte ((mb), CEE_ADD); \
1036 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1040 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1041 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1046 /* FIXME: Do this in the JIT, where specialized allocation sequences can be created
1047 * for each class. This is currently not easy to do, as it is hard to generate basic
1048 * blocks + branches, but it is easy with the linear IL codebase.
1050 * For this to work we'd need to solve the TLAB race, first. Now we
1051 * require the allocator to be in a few known methods to make sure
1052 * that they are executed atomically via the restart mechanism.
1055 create_allocator (int atype, gboolean slowpath)
1057 int p_var, size_var;
1058 guint32 slowpath_branch, max_size_branch;
1059 MonoMethodBuilder *mb;
1061 MonoMethodSignature *csig;
1062 static gboolean registered = FALSE;
1063 int tlab_next_addr_var, new_next_var;
1064 const char *name = NULL;
1069 mono_register_jit_icall (mono_gc_alloc_obj, "mono_gc_alloc_obj", mono_create_icall_signature ("object ptr int"), FALSE);
1070 mono_register_jit_icall (mono_gc_alloc_vector, "mono_gc_alloc_vector", mono_create_icall_signature ("object ptr int int"), FALSE);
1071 mono_register_jit_icall (mono_gc_alloc_string, "mono_gc_alloc_string", mono_create_icall_signature ("object ptr int int32"), FALSE);
1075 if (atype == ATYPE_SMALL) {
1076 name = slowpath ? "SlowAllocSmall" : "AllocSmall";
1077 } else if (atype == ATYPE_NORMAL) {
1078 name = slowpath ? "SlowAlloc" : "Alloc";
1079 } else if (atype == ATYPE_VECTOR) {
1080 name = slowpath ? "SlowAllocVector" : "AllocVector";
1081 } else if (atype == ATYPE_STRING) {
1082 name = slowpath ? "SlowAllocString" : "AllocString";
1084 g_assert_not_reached ();
1087 if (atype == ATYPE_NORMAL)
1092 csig = mono_metadata_signature_alloc (mono_defaults.corlib, num_params);
1093 if (atype == ATYPE_STRING) {
1094 csig->ret = &mono_defaults.string_class->byval_arg;
1095 csig->params [0] = &mono_defaults.int_class->byval_arg;
1096 csig->params [1] = &mono_defaults.int32_class->byval_arg;
1098 csig->ret = &mono_defaults.object_class->byval_arg;
1099 for (i = 0; i < num_params; i++)
1100 csig->params [i] = &mono_defaults.int_class->byval_arg;
1103 mb = mono_mb_new (mono_defaults.object_class, name, MONO_WRAPPER_ALLOC);
1110 mono_mb_emit_ldarg (mb, 0);
1111 mono_mb_emit_icall (mb, ves_icall_object_new_specific);
1114 mono_mb_emit_ldarg (mb, 0);
1115 mono_mb_emit_ldarg (mb, 1);
1116 mono_mb_emit_icall (mb, ves_icall_array_new_specific);
1119 mono_mb_emit_ldarg (mb, 1);
1120 mono_mb_emit_icall (mb, ves_icall_string_alloc);
1123 g_assert_not_reached ();
1129 size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1130 if (atype == ATYPE_SMALL) {
1131 /* size_var = size_arg */
1132 mono_mb_emit_ldarg (mb, 1);
1133 mono_mb_emit_stloc (mb, size_var);
1134 } else if (atype == ATYPE_NORMAL) {
1135 /* size = vtable->klass->instance_size; */
1136 mono_mb_emit_ldarg (mb, 0);
1137 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1138 mono_mb_emit_byte (mb, CEE_ADD);
1139 mono_mb_emit_byte (mb, CEE_LDIND_I);
1140 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, instance_size));
1141 mono_mb_emit_byte (mb, CEE_ADD);
1142 /* FIXME: assert instance_size stays a 4 byte integer */
1143 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1144 mono_mb_emit_byte (mb, CEE_CONV_I);
1145 mono_mb_emit_stloc (mb, size_var);
1146 } else if (atype == ATYPE_VECTOR) {
1147 MonoExceptionClause *clause;
1148 int pos, pos_leave, pos_error;
1149 MonoClass *oom_exc_class;
1153 * n > MONO_ARRAY_MAX_INDEX => OutOfMemoryException
1154 * n < 0 => OverflowException
1156 * We can do an unsigned comparison to catch both cases, then in the error
1157 * case compare signed to distinguish between them.
1159 mono_mb_emit_ldarg (mb, 1);
1160 mono_mb_emit_icon (mb, MONO_ARRAY_MAX_INDEX);
1161 mono_mb_emit_byte (mb, CEE_CONV_U);
1162 pos = mono_mb_emit_short_branch (mb, CEE_BLE_UN_S);
1164 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1165 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1166 mono_mb_emit_ldarg (mb, 1);
1167 mono_mb_emit_icon (mb, 0);
1168 pos_error = mono_mb_emit_short_branch (mb, CEE_BLT_S);
1169 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1170 mono_mb_patch_short_branch (mb, pos_error);
1171 mono_mb_emit_exception (mb, "OverflowException", NULL);
1173 mono_mb_patch_short_branch (mb, pos);
1175 clause = (MonoExceptionClause *)mono_image_alloc0 (mono_defaults.corlib, sizeof (MonoExceptionClause));
1176 clause->try_offset = mono_mb_get_label (mb);
1178 /* vtable->klass->sizes.element_size */
1179 mono_mb_emit_ldarg (mb, 0);
1180 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1181 mono_mb_emit_byte (mb, CEE_ADD);
1182 mono_mb_emit_byte (mb, CEE_LDIND_I);
1183 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, sizes));
1184 mono_mb_emit_byte (mb, CEE_ADD);
1185 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1186 mono_mb_emit_byte (mb, CEE_CONV_I);
1189 mono_mb_emit_ldarg (mb, 1);
1190 mono_mb_emit_byte (mb, CEE_MUL_OVF_UN);
1191 /* + sizeof (MonoArray) */
1192 mono_mb_emit_icon (mb, MONO_SIZEOF_MONO_ARRAY);
1193 mono_mb_emit_byte (mb, CEE_ADD_OVF_UN);
1194 mono_mb_emit_stloc (mb, size_var);
1196 pos_leave = mono_mb_emit_branch (mb, CEE_LEAVE);
1199 clause->flags = MONO_EXCEPTION_CLAUSE_NONE;
1200 clause->try_len = mono_mb_get_pos (mb) - clause->try_offset;
1201 clause->data.catch_class = mono_class_load_from_name (mono_defaults.corlib,
1202 "System", "OverflowException");
1203 clause->handler_offset = mono_mb_get_label (mb);
1205 oom_exc_class = mono_class_load_from_name (mono_defaults.corlib,
1206 "System", "OutOfMemoryException");
1207 ctor = mono_class_get_method_from_name (oom_exc_class, ".ctor", 0);
1210 mono_mb_emit_byte (mb, CEE_POP);
1211 mono_mb_emit_op (mb, CEE_NEWOBJ, ctor);
1212 mono_mb_emit_byte (mb, CEE_THROW);
1214 clause->handler_len = mono_mb_get_pos (mb) - clause->handler_offset;
1215 mono_mb_set_clauses (mb, 1, clause);
1216 mono_mb_patch_branch (mb, pos_leave);
1218 } else if (atype == ATYPE_STRING) {
1222 * a string allocator method takes the args: (vtable, len)
1224 * bytes = offsetof (MonoString, chars) + ((len + 1) * 2)
1228 * bytes <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1232 * offsetof (MonoString, chars) + ((len + 1) * 2) <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1233 * len <= (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - offsetof (MonoString, chars)) / 2 - 1
1235 mono_mb_emit_ldarg (mb, 1);
1236 mono_mb_emit_icon (mb, (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - MONO_STRUCT_OFFSET (MonoString, chars)) / 2 - 1);
1237 pos = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
1239 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1240 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1241 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1242 mono_mb_patch_short_branch (mb, pos);
1244 mono_mb_emit_ldarg (mb, 1);
1245 mono_mb_emit_icon (mb, 1);
1246 mono_mb_emit_byte (mb, MONO_CEE_SHL);
1247 //WE manually fold the above + 2 here
1248 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, chars) + 2);
1249 mono_mb_emit_byte (mb, CEE_ADD);
1250 mono_mb_emit_stloc (mb, size_var);
1252 g_assert_not_reached ();
1255 if (atype != ATYPE_SMALL) {
1256 /* size += ALLOC_ALIGN - 1; */
1257 mono_mb_emit_ldloc (mb, size_var);
1258 mono_mb_emit_icon (mb, SGEN_ALLOC_ALIGN - 1);
1259 mono_mb_emit_byte (mb, CEE_ADD);
1260 /* size &= ~(ALLOC_ALIGN - 1); */
1261 mono_mb_emit_icon (mb, ~(SGEN_ALLOC_ALIGN - 1));
1262 mono_mb_emit_byte (mb, CEE_AND);
1263 mono_mb_emit_stloc (mb, size_var);
1266 /* if (size > MAX_SMALL_OBJ_SIZE) goto slowpath */
1267 if (atype != ATYPE_SMALL) {
1268 mono_mb_emit_ldloc (mb, size_var);
1269 mono_mb_emit_icon (mb, SGEN_MAX_SMALL_OBJ_SIZE);
1270 max_size_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
1274 * We need to modify tlab_next, but the JIT only supports reading, so we read
1275 * another tls var holding its address instead.
1278 /* tlab_next_addr (local) = tlab_next_addr (TLS var) */
1279 tlab_next_addr_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1280 EMIT_TLS_ACCESS_NEXT_ADDR (mb);
1281 mono_mb_emit_stloc (mb, tlab_next_addr_var);
1283 /* p = (void**)tlab_next; */
1284 p_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1285 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1286 mono_mb_emit_byte (mb, CEE_LDIND_I);
1287 mono_mb_emit_stloc (mb, p_var);
1289 /* new_next = (char*)p + size; */
1290 new_next_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1291 mono_mb_emit_ldloc (mb, p_var);
1292 mono_mb_emit_ldloc (mb, size_var);
1293 mono_mb_emit_byte (mb, CEE_CONV_I);
1294 mono_mb_emit_byte (mb, CEE_ADD);
1295 mono_mb_emit_stloc (mb, new_next_var);
1297 /* if (G_LIKELY (new_next < tlab_temp_end)) */
1298 mono_mb_emit_ldloc (mb, new_next_var);
1299 EMIT_TLS_ACCESS_TEMP_END (mb);
1300 slowpath_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
1303 if (atype != ATYPE_SMALL)
1304 mono_mb_patch_short_branch (mb, max_size_branch);
1306 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1307 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1309 /* FIXME: mono_gc_alloc_obj takes a 'size_t' as an argument, not an int32 */
1310 mono_mb_emit_ldarg (mb, 0);
1311 mono_mb_emit_ldloc (mb, size_var);
1312 if (atype == ATYPE_NORMAL || atype == ATYPE_SMALL) {
1313 mono_mb_emit_icall (mb, mono_gc_alloc_obj);
1314 } else if (atype == ATYPE_VECTOR) {
1315 mono_mb_emit_ldarg (mb, 1);
1316 mono_mb_emit_icall (mb, mono_gc_alloc_vector);
1317 } else if (atype == ATYPE_STRING) {
1318 mono_mb_emit_ldarg (mb, 1);
1319 mono_mb_emit_icall (mb, mono_gc_alloc_string);
1321 g_assert_not_reached ();
1323 mono_mb_emit_byte (mb, CEE_RET);
1326 mono_mb_patch_short_branch (mb, slowpath_branch);
1328 /* FIXME: Memory barrier */
1330 /* tlab_next = new_next */
1331 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1332 mono_mb_emit_ldloc (mb, new_next_var);
1333 mono_mb_emit_byte (mb, CEE_STIND_I);
1335 /*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. */
1336 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1337 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1338 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1341 mono_mb_emit_ldloc (mb, p_var);
1342 mono_mb_emit_ldarg (mb, 0);
1343 mono_mb_emit_byte (mb, CEE_STIND_I);
1345 if (atype == ATYPE_VECTOR) {
1346 /* arr->max_length = max_length; */
1347 mono_mb_emit_ldloc (mb, p_var);
1348 mono_mb_emit_ldflda (mb, MONO_STRUCT_OFFSET (MonoArray, max_length));
1349 mono_mb_emit_ldarg (mb, 1);
1350 #ifdef MONO_BIG_ARRAYS
1351 mono_mb_emit_byte (mb, CEE_STIND_I);
1353 mono_mb_emit_byte (mb, CEE_STIND_I4);
1355 } else if (atype == ATYPE_STRING) {
1356 /* need to set length and clear the last char */
1357 /* s->length = len; */
1358 mono_mb_emit_ldloc (mb, p_var);
1359 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, length));
1360 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1361 mono_mb_emit_ldarg (mb, 1);
1362 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
1363 /* s->chars [len] = 0; */
1364 mono_mb_emit_ldloc (mb, p_var);
1365 mono_mb_emit_ldloc (mb, size_var);
1366 mono_mb_emit_icon (mb, 2);
1367 mono_mb_emit_byte (mb, MONO_CEE_SUB);
1368 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1369 mono_mb_emit_icon (mb, 0);
1370 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
1374 We must make sure both vtable and max_length are globaly visible before returning to managed land.
1376 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1377 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1378 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1381 mono_mb_emit_ldloc (mb, p_var);
1384 mono_mb_emit_byte (mb, CEE_RET);
1387 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
1388 info->d.alloc.gc_name = "sgen";
1389 info->d.alloc.alloc_type = atype;
1392 mb->init_locals = FALSE;
1395 res = mono_mb_create (mb, csig, 8, info);
1404 mono_gc_get_aligned_size_for_allocator (int size)
1406 return SGEN_ALIGN_UP (size);
1410 * Generate an allocator method implementing the fast path of mono_gc_alloc_obj ().
1411 * The signature of the called method is:
1412 * object allocate (MonoVTable *vtable)
1415 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box, gboolean known_instance_size)
1417 #ifdef MANAGED_ALLOCATION
1418 if (collect_before_allocs)
1420 if (!mono_runtime_has_tls_get ())
1422 if (klass->instance_size > tlab_size)
1424 if (known_instance_size && ALIGN_TO (klass->instance_size, SGEN_ALLOC_ALIGN) >= SGEN_MAX_SMALL_OBJ_SIZE)
1426 if (mono_class_has_finalizer (klass) || mono_class_is_marshalbyref (klass) || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
1430 if (klass->byval_arg.type == MONO_TYPE_STRING)
1431 return mono_gc_get_managed_allocator_by_type (ATYPE_STRING, FALSE);
1432 /* Generic classes have dynamic field and can go above MAX_SMALL_OBJ_SIZE. */
1433 if (known_instance_size)
1434 return mono_gc_get_managed_allocator_by_type (ATYPE_SMALL, FALSE);
1436 return mono_gc_get_managed_allocator_by_type (ATYPE_NORMAL, FALSE);
1443 mono_gc_get_managed_array_allocator (MonoClass *klass)
1445 #ifdef MANAGED_ALLOCATION
1446 if (klass->rank != 1)
1448 if (!mono_runtime_has_tls_get ())
1450 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1452 if (has_per_allocation_action)
1454 g_assert (!mono_class_has_finalizer (klass) && !mono_class_is_marshalbyref (klass));
1456 return mono_gc_get_managed_allocator_by_type (ATYPE_VECTOR, FALSE);
1463 sgen_set_use_managed_allocator (gboolean flag)
1465 use_managed_allocator = flag;
1469 mono_gc_get_managed_allocator_by_type (int atype, gboolean slowpath)
1471 #ifdef MANAGED_ALLOCATION
1473 MonoMethod **cache = slowpath ? slowpath_alloc_method_cache : alloc_method_cache;
1475 if (!use_managed_allocator)
1478 if (!mono_runtime_has_tls_get ())
1481 res = cache [atype];
1485 res = create_allocator (atype, slowpath);
1487 if (cache [atype]) {
1488 mono_free_method (res);
1489 res = cache [atype];
1491 mono_memory_barrier ();
1492 cache [atype] = res;
1503 mono_gc_get_managed_allocator_types (void)
1509 sgen_is_managed_allocator (MonoMethod *method)
1513 for (i = 0; i < ATYPE_NUM; ++i)
1514 if (method == alloc_method_cache [i] || method == slowpath_alloc_method_cache [i])
1520 sgen_has_managed_allocator (void)
1524 for (i = 0; i < ATYPE_NUM; ++i)
1525 if (alloc_method_cache [i] || slowpath_alloc_method_cache [i])
1531 * Cardtable scanning
1534 #define MWORD_MASK (sizeof (mword) - 1)
1537 find_card_offset (mword card)
1539 /*XXX Use assembly as this generates some pretty bad code */
1540 #if defined(__i386__) && defined(__GNUC__)
1541 return (__builtin_ffs (card) - 1) / 8;
1542 #elif defined(__x86_64__) && defined(__GNUC__)
1543 return (__builtin_ffsll (card) - 1) / 8;
1544 #elif defined(__s390x__)
1545 return (__builtin_ffsll (GUINT64_TO_LE(card)) - 1) / 8;
1548 guint8 *ptr = (guint8 *) &card;
1549 for (i = 0; i < sizeof (mword); ++i) {
1558 find_next_card (guint8 *card_data, guint8 *end)
1560 mword *cards, *cards_end;
1563 while ((((mword)card_data) & MWORD_MASK) && card_data < end) {
1569 if (card_data == end)
1572 cards = (mword*)card_data;
1573 cards_end = (mword*)((mword)end & ~MWORD_MASK);
1574 while (cards < cards_end) {
1577 return (guint8*)cards + find_card_offset (card);
1581 card_data = (guint8*)cards_end;
1582 while (card_data < end) {
1591 #define ARRAY_OBJ_INDEX(ptr,array,elem_size) (((char*)(ptr) - ((char*)(array) + G_STRUCT_OFFSET (MonoArray, vector))) / (elem_size))
1594 sgen_client_cardtable_scan_object (GCObject *obj, mword block_obj_size, guint8 *cards, gboolean mod_union, ScanCopyContext ctx)
1596 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
1597 MonoClass *klass = vt->klass;
1599 SGEN_ASSERT (0, SGEN_VTABLE_HAS_REFERENCES (vt), "Why would we ever call this on reference-free objects?");
1602 MonoArray *arr = (MonoArray*)obj;
1603 guint8 *card_data, *card_base;
1604 guint8 *card_data_end;
1605 char *obj_start = (char *)sgen_card_table_align_pointer (obj);
1607 mword obj_size = sgen_mono_array_size (vt, arr, &bounds_size, sgen_vtable_get_descriptor (vt));
1608 /* We don't want to scan the bounds entries at the end of multidimensional arrays */
1609 char *obj_end = (char*)obj + obj_size - bounds_size;
1611 size_t extra_idx = 0;
1613 mword desc = (mword)klass->element_class->gc_descr;
1614 int elem_size = mono_array_element_size (klass);
1616 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1617 guint8 *overflow_scan_end = NULL;
1620 #ifdef SGEN_OBJECT_LAYOUT_STATISTICS
1621 if (klass->element_class->valuetype)
1622 sgen_object_layout_scanned_vtype_array ();
1624 sgen_object_layout_scanned_ref_array ();
1630 card_data = sgen_card_table_get_card_scan_address ((mword)obj);
1632 card_base = card_data;
1633 card_count = sgen_card_table_number_of_cards_in_range ((mword)obj, obj_size);
1634 card_data_end = card_data + card_count;
1637 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1638 /*Check for overflow and if so, setup to scan in two steps*/
1639 if (!cards && card_data_end >= SGEN_SHADOW_CARDTABLE_END) {
1640 overflow_scan_end = sgen_shadow_cardtable + (card_data_end - SGEN_SHADOW_CARDTABLE_END);
1641 card_data_end = SGEN_SHADOW_CARDTABLE_END;
1647 card_data = find_next_card (card_data, card_data_end);
1648 for (; card_data < card_data_end; card_data = find_next_card (card_data + 1, card_data_end)) {
1650 size_t idx = (card_data - card_base) + extra_idx;
1651 char *start = (char*)(obj_start + idx * CARD_SIZE_IN_BYTES);
1652 char *card_end = start + CARD_SIZE_IN_BYTES;
1653 char *first_elem, *elem;
1655 HEAVY_STAT (++los_marked_cards);
1658 sgen_card_table_prepare_card_for_scanning (card_data);
1660 card_end = MIN (card_end, obj_end);
1662 if (start <= (char*)arr->vector)
1665 index = ARRAY_OBJ_INDEX (start, obj, elem_size);
1667 elem = first_elem = (char*)mono_array_addr_with_size_fast ((MonoArray*)obj, elem_size, index);
1668 if (klass->element_class->valuetype) {
1669 ScanVTypeFunc scan_vtype_func = ctx.ops->scan_vtype;
1671 for (; elem < card_end; elem += elem_size)
1672 scan_vtype_func (obj, elem, desc, ctx.queue BINARY_PROTOCOL_ARG (elem_size));
1674 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
1676 HEAVY_STAT (++los_array_cards);
1677 for (; elem < card_end; elem += SIZEOF_VOID_P) {
1679 gpointer old = *(gpointer*)elem;
1680 if ((mod_union && old) || G_UNLIKELY (sgen_ptr_in_nursery (old))) {
1681 HEAVY_STAT (++los_array_remsets);
1682 copy_func ((GCObject**)elem, ctx.queue);
1683 new_ = *(GCObject **)elem;
1684 if (G_UNLIKELY (sgen_ptr_in_nursery (new_)))
1685 sgen_add_to_global_remset (elem, new_);
1690 binary_protocol_card_scan (first_elem, elem - first_elem);
1693 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1694 if (overflow_scan_end) {
1695 extra_idx = card_data - card_base;
1696 card_base = card_data = sgen_shadow_cardtable;
1697 card_data_end = overflow_scan_end;
1698 overflow_scan_end = NULL;
1709 * Array and string allocation
1713 mono_gc_alloc_vector (MonoVTable *vtable, size_t size, uintptr_t max_length)
1718 if (!SGEN_CAN_ALIGN_UP (size))
1721 #ifndef DISABLE_CRITICAL_REGION
1722 ENTER_CRITICAL_REGION;
1723 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1725 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1726 arr->max_length = (mono_array_size_t)max_length;
1727 EXIT_CRITICAL_REGION;
1730 EXIT_CRITICAL_REGION;
1735 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1736 if (G_UNLIKELY (!arr)) {
1741 arr->max_length = (mono_array_size_t)max_length;
1746 if (G_UNLIKELY (alloc_events))
1747 mono_profiler_allocation (&arr->obj);
1749 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Vector has incorrect size.");
1754 mono_gc_alloc_array (MonoVTable *vtable, size_t size, uintptr_t max_length, uintptr_t bounds_size)
1757 MonoArrayBounds *bounds;
1760 if (!SGEN_CAN_ALIGN_UP (size))
1763 #ifndef DISABLE_CRITICAL_REGION
1764 ENTER_CRITICAL_REGION;
1765 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1767 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1768 arr->max_length = (mono_array_size_t)max_length;
1770 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1771 arr->bounds = bounds;
1772 EXIT_CRITICAL_REGION;
1775 EXIT_CRITICAL_REGION;
1780 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1781 if (G_UNLIKELY (!arr)) {
1786 arr->max_length = (mono_array_size_t)max_length;
1788 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1789 arr->bounds = bounds;
1794 if (G_UNLIKELY (alloc_events))
1795 mono_profiler_allocation (&arr->obj);
1797 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Array has incorrect size.");
1802 mono_gc_alloc_string (MonoVTable *vtable, size_t size, gint32 len)
1807 if (!SGEN_CAN_ALIGN_UP (size))
1810 #ifndef DISABLE_CRITICAL_REGION
1811 ENTER_CRITICAL_REGION;
1812 str = (MonoString*)sgen_try_alloc_obj_nolock (vtable, size);
1814 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1816 EXIT_CRITICAL_REGION;
1819 EXIT_CRITICAL_REGION;
1824 str = (MonoString*)sgen_alloc_obj_nolock (vtable, size);
1825 if (G_UNLIKELY (!str)) {
1835 if (G_UNLIKELY (alloc_events))
1836 mono_profiler_allocation (&str->object);
1846 mono_gc_set_string_length (MonoString *str, gint32 new_length)
1848 mono_unichar2 *new_end = str->chars + new_length;
1850 /* zero the discarded string. This null-delimits the string and allows
1851 * the space to be reclaimed by SGen. */
1853 if (nursery_canaries_enabled () && sgen_ptr_in_nursery (str)) {
1854 CHECK_CANARY_FOR_OBJECT ((GCObject*)str, TRUE);
1855 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2) + CANARY_SIZE);
1856 memcpy (new_end + 1 , CANARY_STRING, CANARY_SIZE);
1858 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2));
1861 str->length = new_length;
1868 #define GC_ROOT_NUM 32
1870 int count; /* must be the first field */
1871 void *objects [GC_ROOT_NUM];
1872 int root_types [GC_ROOT_NUM];
1873 uintptr_t extra_info [GC_ROOT_NUM];
1877 notify_gc_roots (GCRootReport *report)
1881 mono_profiler_gc_roots (report->count, report->objects, report->root_types, report->extra_info);
1886 add_profile_gc_root (GCRootReport *report, void *object, int rtype, uintptr_t extra_info)
1888 if (report->count == GC_ROOT_NUM)
1889 notify_gc_roots (report);
1890 report->objects [report->count] = object;
1891 report->root_types [report->count] = rtype;
1892 report->extra_info [report->count++] = (uintptr_t)SGEN_LOAD_VTABLE (object)->klass;
1896 sgen_client_nursery_objects_pinned (void **definitely_pinned, int count)
1898 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS) {
1899 GCRootReport report;
1902 for (idx = 0; idx < count; ++idx)
1903 add_profile_gc_root (&report, definitely_pinned [idx], MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
1904 notify_gc_roots (&report);
1909 report_finalizer_roots_from_queue (SgenPointerQueue *queue)
1911 GCRootReport report;
1915 for (i = 0; i < queue->next_slot; ++i) {
1916 void *obj = queue->data [i];
1919 add_profile_gc_root (&report, obj, MONO_PROFILE_GC_ROOT_FINALIZER, 0);
1921 notify_gc_roots (&report);
1925 report_finalizer_roots (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
1927 report_finalizer_roots_from_queue (fin_ready_queue);
1928 report_finalizer_roots_from_queue (critical_fin_queue);
1931 static GCRootReport *root_report;
1934 single_arg_report_root (MonoObject **obj, void *gc_data)
1937 add_profile_gc_root (root_report, *obj, MONO_PROFILE_GC_ROOT_OTHER, 0);
1941 precisely_report_roots_from (GCRootReport *report, void** start_root, void** end_root, mword desc)
1943 switch (desc & ROOT_DESC_TYPE_MASK) {
1944 case ROOT_DESC_BITMAP:
1945 desc >>= ROOT_DESC_TYPE_SHIFT;
1947 if ((desc & 1) && *start_root) {
1948 add_profile_gc_root (report, *start_root, MONO_PROFILE_GC_ROOT_OTHER, 0);
1954 case ROOT_DESC_COMPLEX: {
1955 gsize *bitmap_data = (gsize *)sgen_get_complex_descriptor_bitmap (desc);
1956 gsize bwords = (*bitmap_data) - 1;
1957 void **start_run = start_root;
1959 while (bwords-- > 0) {
1960 gsize bmap = *bitmap_data++;
1961 void **objptr = start_run;
1963 if ((bmap & 1) && *objptr) {
1964 add_profile_gc_root (report, *objptr, MONO_PROFILE_GC_ROOT_OTHER, 0);
1969 start_run += GC_BITS_PER_WORD;
1973 case ROOT_DESC_USER: {
1974 MonoGCRootMarkFunc marker = (MonoGCRootMarkFunc)sgen_get_user_descriptor_func (desc);
1975 root_report = report;
1976 marker ((MonoObject**)start_root, single_arg_report_root, NULL);
1979 case ROOT_DESC_RUN_LEN:
1980 g_assert_not_reached ();
1982 g_assert_not_reached ();
1987 report_registered_roots_by_type (int root_type)
1989 GCRootReport report;
1993 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], void **, start_root, RootRecord *, root) {
1994 SGEN_LOG (6, "Precise root scan %p-%p (desc: %p)", start_root, root->end_root, (void*)root->root_desc);
1995 precisely_report_roots_from (&report, start_root, (void**)root->end_root, root->root_desc);
1996 } SGEN_HASH_TABLE_FOREACH_END;
1997 notify_gc_roots (&report);
2001 report_registered_roots (void)
2003 report_registered_roots_by_type (ROOT_TYPE_NORMAL);
2004 report_registered_roots_by_type (ROOT_TYPE_WBARRIER);
2008 sgen_client_collecting_minor (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2010 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2011 report_registered_roots ();
2012 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2013 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2016 static GCRootReport major_root_report;
2017 static gboolean profile_roots;
2020 sgen_client_collecting_major_1 (void)
2022 profile_roots = mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS;
2023 memset (&major_root_report, 0, sizeof (GCRootReport));
2027 sgen_client_pinned_los_object (GCObject *obj)
2030 add_profile_gc_root (&major_root_report, (char*)obj, MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
2034 sgen_client_collecting_major_2 (void)
2037 notify_gc_roots (&major_root_report);
2039 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2040 report_registered_roots ();
2044 sgen_client_collecting_major_3 (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2046 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2047 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2050 #define MOVED_OBJECTS_NUM 64
2051 static void *moved_objects [MOVED_OBJECTS_NUM];
2052 static int moved_objects_idx = 0;
2055 mono_sgen_register_moved_object (void *obj, void *destination)
2057 g_assert (mono_profiler_events & MONO_PROFILE_GC_MOVES);
2059 if (moved_objects_idx == MOVED_OBJECTS_NUM) {
2060 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2061 moved_objects_idx = 0;
2063 moved_objects [moved_objects_idx++] = obj;
2064 moved_objects [moved_objects_idx++] = destination;
2068 mono_sgen_gc_event_moves (void)
2070 if (moved_objects_idx) {
2071 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2072 moved_objects_idx = 0;
2080 #define REFS_SIZE 128
2083 MonoGCReferences callback;
2087 MonoObject *refs [REFS_SIZE];
2088 uintptr_t offsets [REFS_SIZE];
2092 #define HANDLE_PTR(ptr,obj) do { \
2094 if (hwi->count == REFS_SIZE) { \
2095 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data); \
2099 hwi->offsets [hwi->count] = (char*)(ptr)-(char*)start; \
2100 hwi->refs [hwi->count++] = *(ptr); \
2105 collect_references (HeapWalkInfo *hwi, GCObject *obj, size_t size)
2107 char *start = (char*)obj;
2108 mword desc = sgen_obj_get_descriptor (obj);
2110 #include "sgen/sgen-scan-object.h"
2114 walk_references (GCObject *start, size_t size, void *data)
2116 HeapWalkInfo *hwi = (HeapWalkInfo *)data;
2119 collect_references (hwi, start, size);
2120 if (hwi->count || !hwi->called)
2121 hwi->callback (start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data);
2125 * mono_gc_walk_heap:
2126 * @flags: flags for future use
2127 * @callback: a function pointer called for each object in the heap
2128 * @data: a user data pointer that is passed to callback
2130 * This function can be used to iterate over all the live objects in the heap:
2131 * for each object, @callback is invoked, providing info about the object's
2132 * location in memory, its class, its size and the objects it references.
2133 * For each referenced object it's offset from the object address is
2134 * reported in the offsets array.
2135 * The object references may be buffered, so the callback may be invoked
2136 * multiple times for the same object: in all but the first call, the size
2137 * argument will be zero.
2138 * Note that this function can be only called in the #MONO_GC_EVENT_PRE_START_WORLD
2139 * profiler event handler.
2141 * Returns: a non-zero value if the GC doesn't support heap walking
2144 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
2149 hwi.callback = callback;
2152 sgen_clear_nursery_fragments ();
2153 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data, walk_references, &hwi, FALSE, TRUE);
2155 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, walk_references, &hwi);
2156 sgen_los_iterate_objects (walk_references, &hwi);
2166 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
2168 gc_callbacks = *callbacks;
2172 mono_gc_get_gc_callbacks ()
2174 return &gc_callbacks;
2178 sgen_client_thread_register (SgenThreadInfo* info, void *stack_bottom_fallback)
2181 guint8 *staddr = NULL;
2183 #ifndef HAVE_KW_THREAD
2184 g_assert (!mono_native_tls_get_value (thread_info_key));
2185 mono_native_tls_set_value (thread_info_key, info);
2187 sgen_thread_info = info;
2190 info->client_info.skip = 0;
2191 info->client_info.stopped_ip = NULL;
2192 info->client_info.stopped_domain = NULL;
2194 info->client_info.stack_start = NULL;
2196 #ifdef SGEN_POSIX_STW
2197 info->client_info.stop_count = -1;
2198 info->client_info.signal = 0;
2201 /* On win32, stack_start_limit should be 0, since the stack can grow dynamically */
2202 mono_thread_info_get_stack_bounds (&staddr, &stsize);
2205 info->client_info.stack_start_limit = staddr;
2207 info->client_info.stack_end = staddr + stsize;
2209 gsize stack_bottom = (gsize)stack_bottom_fallback;
2210 stack_bottom += 4095;
2211 stack_bottom &= ~4095;
2212 info->client_info.stack_end = (char*)stack_bottom;
2216 memset (&info->client_info.ctx, 0, sizeof (MonoContext));
2218 memset (&info->client_info.regs, 0, sizeof (info->client_info.regs));
2221 if (mono_gc_get_gc_callbacks ()->thread_attach_func)
2222 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2224 binary_protocol_thread_register ((gpointer)mono_thread_info_get_tid (info));
2226 SGEN_LOG (3, "registered thread %p (%p) stack end %p", info, (gpointer)mono_thread_info_get_tid (info), info->client_info.stack_end);
2230 sgen_client_thread_unregister (SgenThreadInfo *p)
2232 MonoNativeThreadId tid;
2234 #ifndef HAVE_KW_THREAD
2235 mono_native_tls_set_value (thread_info_key, NULL);
2237 sgen_thread_info = NULL;
2240 tid = mono_thread_info_get_tid (p);
2242 if (p->client_info.info.runtime_thread)
2243 mono_threads_add_joinable_thread ((gpointer)tid);
2245 if (mono_gc_get_gc_callbacks ()->thread_detach_func) {
2246 mono_gc_get_gc_callbacks ()->thread_detach_func (p->client_info.runtime_data);
2247 p->client_info.runtime_data = NULL;
2250 binary_protocol_thread_unregister ((gpointer)tid);
2251 SGEN_LOG (3, "unregister thread %p (%p)", p, (gpointer)tid);
2255 mono_gc_set_skip_thread (gboolean skip)
2257 SgenThreadInfo *info = mono_thread_info_current ();
2260 info->client_info.gc_disabled = skip;
2265 is_critical_method (MonoMethod *method)
2267 return mono_runtime_is_critical_method (method) || sgen_is_critical_method (method);
2271 thread_in_critical_region (SgenThreadInfo *info)
2273 return info->client_info.in_critical_region;
2277 sgen_thread_attach (SgenThreadInfo *info)
2279 mono_handle_arena_init ((MonoHandleArena**) &info->client_info.info.handle_arena);
2281 if (mono_gc_get_gc_callbacks ()->thread_attach_func && !info->client_info.runtime_data)
2282 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2286 sgen_thread_detach (SgenThreadInfo *p)
2288 /* If a delegate is passed to native code and invoked on a thread we dont
2289 * know about, the jit will register it with mono_jit_thread_attach, but
2290 * we have no way of knowing when that thread goes away. SGen has a TSD
2291 * so we assume that if the domain is still registered, we can detach
2294 if (mono_domain_get ())
2295 mono_thread_detach_internal (mono_thread_internal_current ());
2297 mono_handle_arena_cleanup ((MonoHandleArena**) &p->client_info.info.handle_arena);
2301 mono_gc_register_thread (void *baseptr)
2303 return mono_thread_info_attach (baseptr) != NULL;
2307 mono_gc_is_gc_thread (void)
2311 result = mono_thread_info_current () != NULL;
2317 sgen_client_thread_register_worker (void)
2319 mono_thread_info_register_small_id ();
2322 /* Variables holding start/end nursery so it won't have to be passed at every call */
2323 static void *scan_area_arg_start, *scan_area_arg_end;
2326 mono_gc_conservatively_scan_area (void *start, void *end)
2328 sgen_conservatively_pin_objects_from ((void **)start, (void **)end, scan_area_arg_start, scan_area_arg_end, PIN_TYPE_STACK);
2332 mono_gc_scan_object (void *obj, void *gc_data)
2334 ScanCopyContext *ctx = (ScanCopyContext *)gc_data;
2335 ctx->ops->copy_or_mark_object ((GCObject**)&obj, ctx->queue);
2340 * Mark from thread stacks and registers.
2343 sgen_client_scan_thread_data (void *start_nursery, void *end_nursery, gboolean precise, ScanCopyContext ctx)
2345 SgenThreadInfo *info;
2347 scan_area_arg_start = start_nursery;
2348 scan_area_arg_end = end_nursery;
2350 FOREACH_THREAD (info) {
2351 int skip_reason = 0;
2352 void *aligned_stack_start = (void*)(mword) ALIGN_TO ((mword)info->client_info.stack_start, SIZEOF_VOID_P);
2354 if (info->client_info.skip) {
2355 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);
2357 } else if (info->client_info.gc_disabled) {
2358 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);
2360 } else if (!mono_thread_info_is_live (info)) {
2361 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);
2365 binary_protocol_scan_stack ((gpointer)mono_thread_info_get_tid (info), info->client_info.stack_start, info->client_info.stack_end, skip_reason);
2370 g_assert (info->client_info.suspend_done);
2371 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 ());
2372 if (mono_gc_get_gc_callbacks ()->thread_mark_func && !conservative_stack_mark) {
2373 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);
2374 } else if (!precise) {
2375 if (!conservative_stack_mark) {
2376 fprintf (stderr, "Precise stack mark not supported - disabling.\n");
2377 conservative_stack_mark = TRUE;
2379 sgen_conservatively_pin_objects_from ((void **)aligned_stack_start, (void **)info->client_info.stack_end, start_nursery, end_nursery, PIN_TYPE_STACK);
2384 sgen_conservatively_pin_objects_from ((void**)&info->client_info.ctx, (void**)(&info->client_info.ctx + 1),
2385 start_nursery, end_nursery, PIN_TYPE_STACK);
2387 sgen_conservatively_pin_objects_from ((void**)&info->client_info.regs, (void**)&info->client_info.regs + ARCH_NUM_REGS,
2388 start_nursery, end_nursery, PIN_TYPE_STACK);
2391 // This is used on Coop GC for platforms where we cannot get the data for individual registers.
2392 // We force a spill of all registers into the stack and pass a chunk of data into sgen.
2393 MonoThreadUnwindState *state = &info->client_info.info.thread_saved_state [SELF_SUSPEND_STATE_INDEX];
2394 if (state && state->gc_stackdata) {
2395 sgen_conservatively_pin_objects_from ((void **)state->gc_stackdata, (void**)((char*)state->gc_stackdata + state->gc_stackdata_size),
2396 start_nursery, end_nursery, PIN_TYPE_STACK);
2400 } END_FOREACH_THREAD
2404 * mono_gc_set_stack_end:
2406 * Set the end of the current threads stack to STACK_END. The stack space between
2407 * STACK_END and the real end of the threads stack will not be scanned during collections.
2410 mono_gc_set_stack_end (void *stack_end)
2412 SgenThreadInfo *info;
2415 info = mono_thread_info_current ();
2417 SGEN_ASSERT (0, stack_end < info->client_info.stack_end, "Can only lower stack end");
2418 info->client_info.stack_end = stack_end;
2428 mono_gc_register_root (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2430 return sgen_register_root (start, size, descr, descr ? ROOT_TYPE_NORMAL : ROOT_TYPE_PINNED, source, msg);
2434 mono_gc_register_root_wbarrier (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2436 return sgen_register_root (start, size, descr, ROOT_TYPE_WBARRIER, source, msg);
2440 mono_gc_deregister_root (char* addr)
2442 sgen_deregister_root (addr);
2451 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
2453 return pthread_create (new_thread, attr, start_routine, arg);
2462 sgen_client_total_allocated_heap_changed (size_t allocated_heap)
2464 mono_runtime_resource_check_limit (MONO_RESOURCE_GC_HEAP, allocated_heap);
2468 mono_gc_user_markers_supported (void)
2474 mono_object_is_alive (MonoObject* o)
2480 mono_gc_get_generation (MonoObject *obj)
2482 if (sgen_ptr_in_nursery (obj))
2488 mono_gc_enable_events (void)
2493 mono_gc_get_gc_name (void)
2499 mono_gc_get_description (void)
2501 return g_strdup ("sgen");
2505 mono_gc_set_desktop_mode (void)
2510 mono_gc_is_moving (void)
2516 mono_gc_is_disabled (void)
2522 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
2529 mono_gc_max_generation (void)
2535 mono_gc_precise_stack_mark_enabled (void)
2537 return !conservative_stack_mark;
2541 mono_gc_collect (int generation)
2543 sgen_gc_collect (generation);
2547 mono_gc_collection_count (int generation)
2549 return sgen_gc_collection_count (generation);
2553 mono_gc_get_used_size (void)
2555 return (int64_t)sgen_gc_get_used_size ();
2559 mono_gc_get_heap_size (void)
2561 return (int64_t)sgen_gc_get_total_heap_allocation ();
2565 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
2567 return sgen_make_user_root_descriptor (marker);
2571 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
2573 return SGEN_DESC_STRING;
2577 mono_gc_get_nursery (int *shift_bits, size_t *size)
2579 *size = sgen_nursery_size;
2580 *shift_bits = DEFAULT_NURSERY_BITS;
2581 return sgen_get_nursery_start ();
2585 mono_gc_get_los_limit (void)
2587 return SGEN_MAX_SMALL_OBJ_SIZE;
2591 sgen_client_default_metadata (void)
2593 return mono_domain_get ();
2597 sgen_client_metadata_for_object (GCObject *obj)
2599 return mono_object_domain (obj);
2603 * mono_gchandle_is_in_domain:
2604 * @gchandle: a GCHandle's handle.
2605 * @domain: An application domain.
2607 * Returns: TRUE if the object wrapped by the @gchandle belongs to the specific @domain.
2610 mono_gchandle_is_in_domain (guint32 gchandle, MonoDomain *domain)
2612 MonoDomain *gchandle_domain = (MonoDomain *)sgen_gchandle_get_metadata (gchandle);
2613 return domain->domain_id == gchandle_domain->domain_id;
2617 * mono_gchandle_free_domain:
2618 * @unloading: domain that is unloading
2620 * Function used internally to cleanup any GC handle for objects belonging
2621 * to the specified domain during appdomain unload.
2624 mono_gchandle_free_domain (MonoDomain *unloading)
2629 null_link_if_in_domain (gpointer hidden, GCHandleType handle_type, int max_generation, gpointer user)
2631 MonoDomain *unloading_domain = (MonoDomain *)user;
2632 MonoDomain *obj_domain;
2633 gboolean is_weak = MONO_GC_HANDLE_TYPE_IS_WEAK (handle_type);
2634 if (MONO_GC_HANDLE_IS_OBJECT_POINTER (hidden)) {
2635 MonoObject *obj = (MonoObject *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2636 obj_domain = mono_object_domain (obj);
2638 obj_domain = (MonoDomain *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2640 if (unloading_domain->domain_id == obj_domain->domain_id)
2646 sgen_null_links_for_domain (MonoDomain *domain)
2649 for (type = HANDLE_TYPE_MIN; type < HANDLE_TYPE_MAX; ++type)
2650 sgen_gchandle_iterate ((GCHandleType)type, GENERATION_OLD, null_link_if_in_domain, domain);
2654 mono_gchandle_set_target (guint32 gchandle, MonoObject *obj)
2656 sgen_gchandle_set_target (gchandle, obj);
2660 sgen_client_gchandle_created (int handle_type, GCObject *obj, guint32 handle)
2662 #ifndef DISABLE_PERFCOUNTERS
2663 mono_perfcounters->gc_num_handles++;
2665 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_CREATED, handle_type, handle, obj);
2669 sgen_client_gchandle_destroyed (int handle_type, guint32 handle)
2671 #ifndef DISABLE_PERFCOUNTERS
2672 mono_perfcounters->gc_num_handles--;
2674 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_DESTROYED, handle_type, handle, NULL);
2678 sgen_client_ensure_weak_gchandles_accessible (void)
2681 * During the second bridge processing step the world is
2682 * running again. That step processes all weak links once
2683 * more to null those that refer to dead objects. Before that
2684 * is completed, those links must not be followed, so we
2685 * conservatively wait for bridge processing when any weak
2686 * link is dereferenced.
2688 /* FIXME: A GC can occur after this check fails, in which case we
2689 * should wait for bridge processing but would fail to do so.
2691 if (G_UNLIKELY (bridge_processing_in_progress))
2692 mono_gc_wait_for_bridge_processing ();
2696 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
2700 result = func (data);
2701 UNLOCK_INTERRUPTION;
2706 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
2712 mono_gc_get_card_table (int *shift_bits, gpointer *mask)
2714 return sgen_get_card_table_configuration (shift_bits, mask);
2718 mono_gc_card_table_nursery_check (void)
2720 return !sgen_get_major_collector ()->is_concurrent;
2723 /* Negative value to remove */
2725 mono_gc_add_memory_pressure (gint64 value)
2727 /* FIXME: Implement at some point? */
2735 sgen_client_degraded_allocation (size_t size)
2737 static int last_major_gc_warned = -1;
2738 static int num_degraded = 0;
2740 if (last_major_gc_warned < (int)gc_stats.major_gc_count) {
2742 if (num_degraded == 1 || num_degraded == 3)
2743 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Degraded allocation. Consider increasing nursery-size if the warning persists.");
2744 else if (num_degraded == 10)
2745 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Repeated degraded allocation. Consider increasing nursery-size.");
2746 last_major_gc_warned = gc_stats.major_gc_count;
2751 sgen_client_log_timing (GGTimingInfo *info, mword last_major_num_sections, mword last_los_memory_usage)
2753 SgenMajorCollector *major_collector = sgen_get_major_collector ();
2754 mword num_major_sections = major_collector->get_num_major_sections ();
2755 char full_timing_buff [1024];
2756 full_timing_buff [0] = '\0';
2758 if (!info->is_overflow)
2759 sprintf (full_timing_buff, "total %.2fms, bridge %.2fms", info->stw_time / 10000.0f, (int)info->bridge_time / 10000.0f);
2760 if (info->generation == GENERATION_OLD)
2761 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "GC_MAJOR%s: (%s) pause %.2fms, %s major %dK/%dK los %dK/%dK",
2762 info->is_overflow ? "_OVERFLOW" : "",
2763 info->reason ? info->reason : "",
2764 (int)info->total_time / 10000.0f,
2766 major_collector->section_size * num_major_sections / 1024,
2767 major_collector->section_size * last_major_num_sections / 1024,
2768 los_memory_usage / 1024,
2769 last_los_memory_usage / 1024);
2771 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "GC_MINOR%s: (%s) pause %.2fms, %s promoted %dK major %dK los %dK",
2772 info->is_overflow ? "_OVERFLOW" : "",
2773 info->reason ? info->reason : "",
2774 (int)info->total_time / 10000.0f,
2776 (num_major_sections - last_major_num_sections) * major_collector->section_size / 1024,
2777 major_collector->section_size * num_major_sections / 1024,
2778 los_memory_usage / 1024);
2786 sgen_client_description_for_internal_mem_type (int type)
2789 case INTERNAL_MEM_EPHEMERON_LINK: return "ephemeron-link";
2796 sgen_client_pre_collection_checks (void)
2798 if (sgen_mono_xdomain_checks) {
2799 sgen_clear_nursery_fragments ();
2800 sgen_check_for_xdomain_refs ();
2805 sgen_client_vtable_is_inited (MonoVTable *vt)
2807 return vt->klass->inited;
2811 sgen_client_vtable_get_namespace (MonoVTable *vt)
2813 return vt->klass->name_space;
2817 sgen_client_vtable_get_name (MonoVTable *vt)
2819 return vt->klass->name;
2827 sgen_client_init (void)
2830 MonoThreadInfoCallbacks cb;
2832 cb.thread_register = sgen_thread_register;
2833 cb.thread_detach = sgen_thread_detach;
2834 cb.thread_unregister = sgen_thread_unregister;
2835 cb.thread_attach = sgen_thread_attach;
2836 cb.mono_method_is_critical = (gboolean (*)(void *))is_critical_method;
2837 cb.mono_thread_in_critical_region = thread_in_critical_region;
2839 mono_threads_init (&cb, sizeof (SgenThreadInfo));
2841 ///* Keep this the default for now */
2842 /* Precise marking is broken on all supported targets. Disable until fixed. */
2843 conservative_stack_mark = TRUE;
2845 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_EPHEMERON_LINK, sizeof (EphemeronLinkNode));
2847 mono_sgen_init_stw ();
2849 #ifndef HAVE_KW_THREAD
2850 mono_native_tls_alloc (&thread_info_key, NULL);
2851 #if defined(TARGET_OSX) || defined(TARGET_WIN32) || defined(TARGET_ANDROID) || defined(TARGET_IOS)
2853 * CEE_MONO_TLS requires the tls offset, not the key, so the code below only works on darwin,
2854 * where the two are the same.
2856 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO, thread_info_key);
2860 int tls_offset = -1;
2861 MONO_THREAD_VAR_OFFSET (sgen_thread_info, tls_offset);
2862 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO, tls_offset);
2867 * This needs to happen before any internal allocations because
2868 * it inits the small id which is required for hazard pointer
2873 mono_gc_register_thread (&dummy);
2877 sgen_client_handle_gc_param (const char *opt)
2879 if (g_str_has_prefix (opt, "stack-mark=")) {
2880 opt = strchr (opt, '=') + 1;
2881 if (!strcmp (opt, "precise")) {
2882 conservative_stack_mark = FALSE;
2883 } else if (!strcmp (opt, "conservative")) {
2884 conservative_stack_mark = TRUE;
2886 sgen_env_var_error (MONO_GC_PARAMS_NAME, conservative_stack_mark ? "Using `conservative`." : "Using `precise`.",
2887 "Invalid value `%s` for `stack-mark` option, possible values are: `precise`, `conservative`.", opt);
2889 } else if (g_str_has_prefix (opt, "bridge-implementation=")) {
2890 opt = strchr (opt, '=') + 1;
2891 sgen_set_bridge_implementation (opt);
2892 } else if (g_str_has_prefix (opt, "toggleref-test")) {
2893 /* FIXME: This should probably in MONO_GC_DEBUG */
2894 sgen_register_test_toggleref_callback ();
2902 sgen_client_print_gc_params_usage (void)
2904 fprintf (stderr, " stack-mark=MARK-METHOD (where MARK-METHOD is 'precise' or 'conservative')\n");
2908 sgen_client_handle_gc_debug (const char *opt)
2910 if (!strcmp (opt, "xdomain-checks")) {
2911 sgen_mono_xdomain_checks = TRUE;
2912 } else if (!strcmp (opt, "do-not-finalize")) {
2913 mono_do_not_finalize = TRUE;
2914 } else if (g_str_has_prefix (opt, "do-not-finalize=")) {
2915 opt = strchr (opt, '=') + 1;
2916 mono_do_not_finalize = TRUE;
2917 mono_do_not_finalize_class_names = g_strsplit (opt, ",", 0);
2918 } else if (!strcmp (opt, "log-finalizers")) {
2919 log_finalizers = TRUE;
2920 } else if (!strcmp (opt, "no-managed-allocator")) {
2921 sgen_set_use_managed_allocator (FALSE);
2922 } else if (!sgen_bridge_handle_gc_debug (opt)) {
2929 sgen_client_print_gc_debug_usage (void)
2931 fprintf (stderr, " xdomain-checks\n");
2932 fprintf (stderr, " do-not-finalize\n");
2933 fprintf (stderr, " log-finalizers\n");
2934 fprintf (stderr, " no-managed-allocator\n");
2935 sgen_bridge_print_gc_debug_usage ();
2940 sgen_client_get_provenance (void)
2942 #ifdef SGEN_OBJECT_PROVENANCE
2943 MonoGCCallbacks *cb = mono_gc_get_gc_callbacks ();
2944 gpointer (*get_provenance_func) (void);
2947 get_provenance_func = cb->get_provenance_func;
2948 if (get_provenance_func)
2949 return get_provenance_func ();
2957 sgen_client_describe_invalid_pointer (GCObject *ptr)
2959 sgen_bridge_describe_pointer (ptr);
2963 mono_gc_base_init (void)
2965 mono_counters_init ();
2967 #ifdef HEAVY_STATISTICS
2968 mono_counters_register ("los marked cards", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_marked_cards);
2969 mono_counters_register ("los array cards scanned ", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_cards);
2970 mono_counters_register ("los array remsets", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_remsets);
2972 mono_counters_register ("WBarrier set arrayref", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_set_arrayref);
2973 mono_counters_register ("WBarrier value copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_value_copy);
2974 mono_counters_register ("WBarrier object copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_object_copy);
2979 if (nursery_canaries_enabled ())
2980 sgen_set_use_managed_allocator (FALSE);
2982 #if defined(HAVE_KW_THREAD)
2983 /* This can happen with using libmonosgen.so */
2984 if (mono_tls_key_get_offset (TLS_KEY_SGEN_TLAB_NEXT_ADDR) == -1)
2985 sgen_set_use_managed_allocator (FALSE);
2990 mono_gc_base_cleanup (void)
2995 mono_gc_is_null (void)