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 int aligned_size = size;
1404 aligned_size += SGEN_ALLOC_ALIGN - 1;
1405 aligned_size &= ~(SGEN_ALLOC_ALIGN - 1);
1406 return aligned_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)) {
1738 return mono_gc_out_of_memory (size);
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)) {
1783 return mono_gc_out_of_memory (size);
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)) {
1827 return mono_gc_out_of_memory (size);
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 if (mono_gc_get_gc_callbacks ()->thread_attach_func && !info->client_info.runtime_data)
2280 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2284 sgen_thread_detach (SgenThreadInfo *p)
2286 /* If a delegate is passed to native code and invoked on a thread we dont
2287 * know about, the jit will register it with mono_jit_thread_attach, but
2288 * we have no way of knowing when that thread goes away. SGen has a TSD
2289 * so we assume that if the domain is still registered, we can detach
2292 if (mono_domain_get ())
2293 mono_thread_detach_internal (mono_thread_internal_current ());
2297 mono_gc_register_thread (void *baseptr)
2299 return mono_thread_info_attach (baseptr) != NULL;
2303 mono_gc_is_gc_thread (void)
2307 result = mono_thread_info_current () != NULL;
2313 sgen_client_thread_register_worker (void)
2315 mono_thread_info_register_small_id ();
2318 /* Variables holding start/end nursery so it won't have to be passed at every call */
2319 static void *scan_area_arg_start, *scan_area_arg_end;
2322 mono_gc_conservatively_scan_area (void *start, void *end)
2324 sgen_conservatively_pin_objects_from ((void **)start, (void **)end, scan_area_arg_start, scan_area_arg_end, PIN_TYPE_STACK);
2328 mono_gc_scan_object (void *obj, void *gc_data)
2330 ScanCopyContext *ctx = (ScanCopyContext *)gc_data;
2331 ctx->ops->copy_or_mark_object ((GCObject**)&obj, ctx->queue);
2336 * Mark from thread stacks and registers.
2339 sgen_client_scan_thread_data (void *start_nursery, void *end_nursery, gboolean precise, ScanCopyContext ctx)
2341 SgenThreadInfo *info;
2343 scan_area_arg_start = start_nursery;
2344 scan_area_arg_end = end_nursery;
2346 FOREACH_THREAD (info) {
2347 int skip_reason = 0;
2348 void *aligned_stack_start = (void*)(mword) ALIGN_TO ((mword)info->client_info.stack_start, SIZEOF_VOID_P);
2350 if (info->client_info.skip) {
2351 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);
2353 } else if (info->client_info.gc_disabled) {
2354 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);
2356 } else if (!mono_thread_info_is_live (info)) {
2357 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);
2361 binary_protocol_scan_stack ((gpointer)mono_thread_info_get_tid (info), info->client_info.stack_start, info->client_info.stack_end, skip_reason);
2366 g_assert (info->client_info.suspend_done);
2367 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 ());
2368 if (mono_gc_get_gc_callbacks ()->thread_mark_func && !conservative_stack_mark) {
2369 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);
2370 } else if (!precise) {
2371 if (!conservative_stack_mark) {
2372 fprintf (stderr, "Precise stack mark not supported - disabling.\n");
2373 conservative_stack_mark = TRUE;
2375 sgen_conservatively_pin_objects_from ((void **)aligned_stack_start, (void **)info->client_info.stack_end, start_nursery, end_nursery, PIN_TYPE_STACK);
2380 sgen_conservatively_pin_objects_from ((void**)&info->client_info.ctx, (void**)&info->client_info.ctx + ARCH_NUM_REGS,
2381 start_nursery, end_nursery, PIN_TYPE_STACK);
2383 sgen_conservatively_pin_objects_from ((void**)&info->client_info.regs, (void**)&info->client_info.regs + ARCH_NUM_REGS,
2384 start_nursery, end_nursery, PIN_TYPE_STACK);
2387 // This is used on Coop GC for platforms where we cannot get the data for individual registers.
2388 // We force a spill of all registers into the stack and pass a chunk of data into sgen.
2389 MonoThreadUnwindState *state = &info->client_info.info.thread_saved_state [SELF_SUSPEND_STATE_INDEX];
2390 if (state && state->gc_stackdata) {
2391 sgen_conservatively_pin_objects_from ((void **)state->gc_stackdata, (void**)((char*)state->gc_stackdata + state->gc_stackdata_size),
2392 start_nursery, end_nursery, PIN_TYPE_STACK);
2396 } END_FOREACH_THREAD
2400 * mono_gc_set_stack_end:
2402 * Set the end of the current threads stack to STACK_END. The stack space between
2403 * STACK_END and the real end of the threads stack will not be scanned during collections.
2406 mono_gc_set_stack_end (void *stack_end)
2408 SgenThreadInfo *info;
2411 info = mono_thread_info_current ();
2413 SGEN_ASSERT (0, stack_end < info->client_info.stack_end, "Can only lower stack end");
2414 info->client_info.stack_end = stack_end;
2424 mono_gc_register_root (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2426 return sgen_register_root (start, size, descr, descr ? ROOT_TYPE_NORMAL : ROOT_TYPE_PINNED, source, msg);
2430 mono_gc_register_root_wbarrier (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2432 return sgen_register_root (start, size, descr, ROOT_TYPE_WBARRIER, source, msg);
2436 mono_gc_deregister_root (char* addr)
2438 sgen_deregister_root (addr);
2447 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
2449 return pthread_create (new_thread, attr, start_routine, arg);
2458 sgen_client_total_allocated_heap_changed (size_t allocated_heap)
2460 mono_runtime_resource_check_limit (MONO_RESOURCE_GC_HEAP, allocated_heap);
2464 mono_gc_user_markers_supported (void)
2470 mono_object_is_alive (MonoObject* o)
2476 mono_gc_get_generation (MonoObject *obj)
2478 if (sgen_ptr_in_nursery (obj))
2484 mono_gc_enable_events (void)
2489 mono_gc_get_gc_name (void)
2495 mono_gc_get_description (void)
2497 return g_strdup ("sgen");
2501 mono_gc_set_desktop_mode (void)
2506 mono_gc_is_moving (void)
2512 mono_gc_is_disabled (void)
2518 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
2525 mono_gc_max_generation (void)
2531 mono_gc_precise_stack_mark_enabled (void)
2533 return !conservative_stack_mark;
2537 mono_gc_collect (int generation)
2539 sgen_gc_collect (generation);
2543 mono_gc_collection_count (int generation)
2545 return sgen_gc_collection_count (generation);
2549 mono_gc_get_used_size (void)
2551 return (int64_t)sgen_gc_get_used_size ();
2555 mono_gc_get_heap_size (void)
2557 return (int64_t)sgen_gc_get_total_heap_allocation ();
2561 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
2563 return sgen_make_user_root_descriptor (marker);
2567 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
2569 return SGEN_DESC_STRING;
2573 mono_gc_get_nursery (int *shift_bits, size_t *size)
2575 *size = sgen_nursery_size;
2576 *shift_bits = DEFAULT_NURSERY_BITS;
2577 return sgen_get_nursery_start ();
2581 mono_gc_get_los_limit (void)
2583 return SGEN_MAX_SMALL_OBJ_SIZE;
2587 sgen_client_default_metadata (void)
2589 return mono_domain_get ();
2593 sgen_client_metadata_for_object (GCObject *obj)
2595 return mono_object_domain (obj);
2599 * mono_gchandle_is_in_domain:
2600 * @gchandle: a GCHandle's handle.
2601 * @domain: An application domain.
2603 * Returns: true if the object wrapped by the @gchandle belongs to the specific @domain.
2606 mono_gchandle_is_in_domain (guint32 gchandle, MonoDomain *domain)
2608 MonoDomain *gchandle_domain = (MonoDomain *)sgen_gchandle_get_metadata (gchandle);
2609 return domain->domain_id == gchandle_domain->domain_id;
2613 * mono_gchandle_free_domain:
2614 * @unloading: domain that is unloading
2616 * Function used internally to cleanup any GC handle for objects belonging
2617 * to the specified domain during appdomain unload.
2620 mono_gchandle_free_domain (MonoDomain *unloading)
2625 null_link_if_in_domain (gpointer hidden, GCHandleType handle_type, int max_generation, gpointer user)
2627 MonoDomain *unloading_domain = (MonoDomain *)user;
2628 MonoDomain *obj_domain;
2629 gboolean is_weak = MONO_GC_HANDLE_TYPE_IS_WEAK (handle_type);
2630 if (MONO_GC_HANDLE_IS_OBJECT_POINTER (hidden)) {
2631 MonoObject *obj = (MonoObject *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2632 obj_domain = mono_object_domain (obj);
2634 obj_domain = (MonoDomain *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2636 if (unloading_domain->domain_id == obj_domain->domain_id)
2642 sgen_null_links_for_domain (MonoDomain *domain)
2645 for (type = HANDLE_TYPE_MIN; type < HANDLE_TYPE_MAX; ++type)
2646 sgen_gchandle_iterate ((GCHandleType)type, GENERATION_OLD, null_link_if_in_domain, domain);
2650 mono_gchandle_set_target (guint32 gchandle, MonoObject *obj)
2652 sgen_gchandle_set_target (gchandle, obj);
2656 sgen_client_gchandle_created (int handle_type, GCObject *obj, guint32 handle)
2658 #ifndef DISABLE_PERFCOUNTERS
2659 mono_perfcounters->gc_num_handles++;
2661 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_CREATED, handle_type, handle, obj);
2665 sgen_client_gchandle_destroyed (int handle_type, guint32 handle)
2667 #ifndef DISABLE_PERFCOUNTERS
2668 mono_perfcounters->gc_num_handles--;
2670 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_DESTROYED, handle_type, handle, NULL);
2674 sgen_client_ensure_weak_gchandles_accessible (void)
2677 * During the second bridge processing step the world is
2678 * running again. That step processes all weak links once
2679 * more to null those that refer to dead objects. Before that
2680 * is completed, those links must not be followed, so we
2681 * conservatively wait for bridge processing when any weak
2682 * link is dereferenced.
2684 /* FIXME: A GC can occur after this check fails, in which case we
2685 * should wait for bridge processing but would fail to do so.
2687 if (G_UNLIKELY (bridge_processing_in_progress))
2688 mono_gc_wait_for_bridge_processing ();
2692 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
2696 result = func (data);
2697 UNLOCK_INTERRUPTION;
2702 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
2708 sgen_client_out_of_memory (size_t size)
2710 mono_gc_out_of_memory (size);
2714 mono_gc_get_card_table (int *shift_bits, gpointer *mask)
2716 return sgen_get_card_table_configuration (shift_bits, mask);
2720 mono_gc_card_table_nursery_check (void)
2722 return !sgen_get_major_collector ()->is_concurrent;
2725 /* Negative value to remove */
2727 mono_gc_add_memory_pressure (gint64 value)
2729 /* FIXME: Implement at some point? */
2737 sgen_client_degraded_allocation (size_t size)
2739 static int last_major_gc_warned = -1;
2740 static int num_degraded = 0;
2742 if (last_major_gc_warned < gc_stats.major_gc_count) {
2744 if (num_degraded == 1 || num_degraded == 3)
2745 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Degraded allocation. Consider increasing nursery-size if the warning persists.");
2746 else if (num_degraded == 10)
2747 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Repeated degraded allocation. Consider increasing nursery-size.");
2748 last_major_gc_warned = gc_stats.major_gc_count;
2753 sgen_client_log_timing (GGTimingInfo *info, mword last_major_num_sections, mword last_los_memory_usage)
2755 SgenMajorCollector *major_collector = sgen_get_major_collector ();
2756 mword num_major_sections = major_collector->get_num_major_sections ();
2757 char full_timing_buff [1024];
2758 full_timing_buff [0] = '\0';
2760 if (!info->is_overflow)
2761 sprintf (full_timing_buff, "total %.2fms, bridge %.2fms", info->stw_time / 10000.0f, (int)info->bridge_time / 10000.0f);
2762 if (info->generation == GENERATION_OLD)
2763 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "GC_MAJOR%s: (%s) pause %.2fms, %s major %dK/%dK los %dK/%dK",
2764 info->is_overflow ? "_OVERFLOW" : "",
2765 info->reason ? info->reason : "",
2766 (int)info->total_time / 10000.0f,
2768 major_collector->section_size * num_major_sections / 1024,
2769 major_collector->section_size * last_major_num_sections / 1024,
2770 los_memory_usage / 1024,
2771 last_los_memory_usage / 1024);
2773 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "GC_MINOR%s: (%s) pause %.2fms, %s promoted %dK major %dK los %dK",
2774 info->is_overflow ? "_OVERFLOW" : "",
2775 info->reason ? info->reason : "",
2776 (int)info->total_time / 10000.0f,
2778 (num_major_sections - last_major_num_sections) * major_collector->section_size / 1024,
2779 major_collector->section_size * num_major_sections / 1024,
2780 los_memory_usage / 1024);
2788 sgen_client_description_for_internal_mem_type (int type)
2791 case INTERNAL_MEM_EPHEMERON_LINK: return "ephemeron-link";
2798 sgen_client_pre_collection_checks (void)
2800 if (sgen_mono_xdomain_checks) {
2801 sgen_clear_nursery_fragments ();
2802 sgen_check_for_xdomain_refs ();
2807 sgen_client_vtable_is_inited (MonoVTable *vt)
2809 return vt->klass->inited;
2813 sgen_client_vtable_get_namespace (MonoVTable *vt)
2815 return vt->klass->name_space;
2819 sgen_client_vtable_get_name (MonoVTable *vt)
2821 return vt->klass->name;
2829 sgen_client_init (void)
2832 MonoThreadInfoCallbacks cb;
2834 cb.thread_register = sgen_thread_register;
2835 cb.thread_detach = sgen_thread_detach;
2836 cb.thread_unregister = sgen_thread_unregister;
2837 cb.thread_attach = sgen_thread_attach;
2838 cb.mono_method_is_critical = (gboolean (*)(void *))is_critical_method;
2839 cb.mono_thread_in_critical_region = thread_in_critical_region;
2841 mono_threads_init (&cb, sizeof (SgenThreadInfo));
2843 ///* Keep this the default for now */
2844 /* Precise marking is broken on all supported targets. Disable until fixed. */
2845 conservative_stack_mark = TRUE;
2847 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_EPHEMERON_LINK, sizeof (EphemeronLinkNode));
2849 mono_sgen_init_stw ();
2851 #ifndef HAVE_KW_THREAD
2852 mono_native_tls_alloc (&thread_info_key, NULL);
2853 #if defined(TARGET_OSX) || defined(TARGET_WIN32) || defined(TARGET_ANDROID) || defined(TARGET_IOS)
2855 * CEE_MONO_TLS requires the tls offset, not the key, so the code below only works on darwin,
2856 * where the two are the same.
2858 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO, thread_info_key);
2862 int tls_offset = -1;
2863 MONO_THREAD_VAR_OFFSET (sgen_thread_info, tls_offset);
2864 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO, tls_offset);
2869 * This needs to happen before any internal allocations because
2870 * it inits the small id which is required for hazard pointer
2875 mono_gc_register_thread (&dummy);
2879 sgen_client_handle_gc_param (const char *opt)
2881 if (g_str_has_prefix (opt, "stack-mark=")) {
2882 opt = strchr (opt, '=') + 1;
2883 if (!strcmp (opt, "precise")) {
2884 conservative_stack_mark = FALSE;
2885 } else if (!strcmp (opt, "conservative")) {
2886 conservative_stack_mark = TRUE;
2888 sgen_env_var_error (MONO_GC_PARAMS_NAME, conservative_stack_mark ? "Using `conservative`." : "Using `precise`.",
2889 "Invalid value `%s` for `stack-mark` option, possible values are: `precise`, `conservative`.", opt);
2891 } else if (g_str_has_prefix (opt, "bridge-implementation=")) {
2892 opt = strchr (opt, '=') + 1;
2893 sgen_set_bridge_implementation (opt);
2894 } else if (g_str_has_prefix (opt, "toggleref-test")) {
2895 /* FIXME: This should probably in MONO_GC_DEBUG */
2896 sgen_register_test_toggleref_callback ();
2904 sgen_client_print_gc_params_usage (void)
2906 fprintf (stderr, " stack-mark=MARK-METHOD (where MARK-METHOD is 'precise' or 'conservative')\n");
2910 sgen_client_handle_gc_debug (const char *opt)
2912 if (!strcmp (opt, "xdomain-checks")) {
2913 sgen_mono_xdomain_checks = TRUE;
2914 } else if (!strcmp (opt, "do-not-finalize")) {
2915 mono_do_not_finalize = TRUE;
2916 } else if (g_str_has_prefix (opt, "do-not-finalize=")) {
2917 opt = strchr (opt, '=') + 1;
2918 mono_do_not_finalize = TRUE;
2919 mono_do_not_finalize_class_names = g_strsplit (opt, ",", 0);
2920 } else if (!strcmp (opt, "log-finalizers")) {
2921 log_finalizers = TRUE;
2922 } else if (!strcmp (opt, "no-managed-allocator")) {
2923 sgen_set_use_managed_allocator (FALSE);
2924 } else if (!sgen_bridge_handle_gc_debug (opt)) {
2931 sgen_client_print_gc_debug_usage (void)
2933 fprintf (stderr, " xdomain-checks\n");
2934 fprintf (stderr, " do-not-finalize\n");
2935 fprintf (stderr, " log-finalizers\n");
2936 fprintf (stderr, " no-managed-allocator\n");
2937 sgen_bridge_print_gc_debug_usage ();
2942 sgen_client_get_provenance (void)
2944 #ifdef SGEN_OBJECT_PROVENANCE
2945 MonoGCCallbacks *cb = mono_gc_get_gc_callbacks ();
2946 gpointer (*get_provenance_func) (void);
2949 get_provenance_func = cb->get_provenance_func;
2950 if (get_provenance_func)
2951 return get_provenance_func ();
2959 sgen_client_describe_invalid_pointer (GCObject *ptr)
2961 sgen_bridge_describe_pointer (ptr);
2965 mono_gc_base_init (void)
2967 mono_counters_init ();
2969 #ifdef HEAVY_STATISTICS
2970 mono_counters_register ("los marked cards", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_marked_cards);
2971 mono_counters_register ("los array cards scanned ", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_cards);
2972 mono_counters_register ("los array remsets", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_remsets);
2974 mono_counters_register ("WBarrier set arrayref", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_set_arrayref);
2975 mono_counters_register ("WBarrier value copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_value_copy);
2976 mono_counters_register ("WBarrier object copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_object_copy);
2981 if (nursery_canaries_enabled ())
2982 sgen_set_use_managed_allocator (FALSE);
2984 #if defined(HAVE_KW_THREAD)
2985 /* This can happen with using libmonosgen.so */
2986 if (mono_tls_key_get_offset (TLS_KEY_SGEN_TLAB_NEXT_ADDR) == -1)
2987 sgen_set_use_managed_allocator (FALSE);
2992 mono_gc_base_cleanup (void)
2997 mono_gc_is_null (void)