2 * sgen-mono.c: SGen features specific to Mono.
4 * Copyright (C) 2014 Xamarin Inc
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License 2.0 as published by the Free Software Foundation;
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
15 * You should have received a copy of the GNU Library General Public
16 * License 2.0 along with this library; if not, write to the Free
17 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include "sgen/sgen-gc.h"
24 #include "sgen/sgen-protocol.h"
25 #include "metadata/monitor.h"
26 #include "sgen/sgen-layout-stats.h"
27 #include "sgen/sgen-client.h"
28 #include "sgen/sgen-cardtable.h"
29 #include "sgen/sgen-pinning.h"
30 #include "metadata/marshal.h"
31 #include "metadata/method-builder.h"
32 #include "metadata/abi-details.h"
33 #include "metadata/mono-gc.h"
34 #include "metadata/runtime.h"
35 #include "metadata/sgen-bridge-internal.h"
36 #include "metadata/gc-internal.h"
37 #include "utils/mono-memory-model.h"
38 #include "utils/mono-logger-internal.h"
40 #ifdef HEAVY_STATISTICS
41 static guint64 stat_wbarrier_set_arrayref = 0;
42 static guint64 stat_wbarrier_value_copy = 0;
43 static guint64 stat_wbarrier_object_copy = 0;
45 static guint64 los_marked_cards;
46 static guint64 los_array_cards;
47 static guint64 los_array_remsets;
50 /* If set, mark stacks conservatively, even if precise marking is possible */
51 static gboolean conservative_stack_mark = FALSE;
52 /* If set, check that there are no references to the domain left at domain unload */
53 gboolean sgen_mono_xdomain_checks = FALSE;
55 /* Functions supplied by the runtime to be called by the GC */
56 static MonoGCCallbacks gc_callbacks;
59 __thread SgenThreadInfo *sgen_thread_info;
61 MonoNativeTlsKey thread_info_key;
64 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
66 #define OPDEF(a,b,c,d,e,f,g,h,i,j) \
70 #include "mono/cil/opcode.def"
81 ptr_on_stack (void *ptr)
83 gpointer stack_start = &stack_start;
84 SgenThreadInfo *info = mono_thread_info_current ();
86 if (ptr >= stack_start && ptr < (gpointer)info->client_info.stack_end)
91 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
93 #define HANDLE_PTR(ptr,obj) do { \
94 gpointer o = *(gpointer*)(ptr); \
96 gpointer d = ((char*)dest) + ((char*)(ptr) - (char*)(obj)); \
97 binary_protocol_wbarrier (d, o, (gpointer) SGEN_LOAD_VTABLE (o)); \
102 scan_object_for_binary_protocol_copy_wbarrier (gpointer dest, char *start, mword desc)
104 #define SCAN_OBJECT_NOVTABLE
105 #include "sgen/sgen-scan-object.h"
110 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
112 HEAVY_STAT (++stat_wbarrier_value_copy);
113 g_assert (klass->valuetype);
115 SGEN_LOG (8, "Adding value remset at %p, count %d, descr %p for class %s (%p)", dest, count, klass->gc_descr, klass->name, klass);
117 if (sgen_ptr_in_nursery (dest) || ptr_on_stack (dest) || !sgen_gc_descr_has_references ((mword)klass->gc_descr)) {
118 size_t element_size = mono_class_value_size (klass, NULL);
119 size_t size = count * element_size;
120 mono_gc_memmove_atomic (dest, src, size);
124 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
125 if (binary_protocol_is_heavy_enabled ()) {
126 size_t element_size = mono_class_value_size (klass, NULL);
128 for (i = 0; i < count; ++i) {
129 scan_object_for_binary_protocol_copy_wbarrier ((char*)dest + i * element_size,
130 (char*)src + i * element_size - sizeof (MonoObject),
131 (mword) klass->gc_descr);
136 sgen_get_remset ()->wbarrier_value_copy (dest, src, count, mono_class_value_size (klass, NULL));
140 * mono_gc_wbarrier_object_copy:
142 * Write barrier to call when obj is the result of a clone or copy of an object.
145 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
149 HEAVY_STAT (++stat_wbarrier_object_copy);
151 if (sgen_ptr_in_nursery (obj) || ptr_on_stack (obj) || !SGEN_OBJECT_HAS_REFERENCES (src)) {
152 size = mono_object_class (obj)->instance_size;
153 mono_gc_memmove_aligned ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
154 size - sizeof (MonoObject));
158 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
159 if (binary_protocol_is_heavy_enabled ())
160 scan_object_for_binary_protocol_copy_wbarrier (obj, (char*)src, (mword) src->vtable->gc_descr);
163 sgen_get_remset ()->wbarrier_object_copy (obj, src);
167 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
169 HEAVY_STAT (++stat_wbarrier_set_arrayref);
170 if (sgen_ptr_in_nursery (slot_ptr)) {
171 *(void**)slot_ptr = value;
174 SGEN_LOG (8, "Adding remset at %p", slot_ptr);
176 binary_protocol_wbarrier (slot_ptr, value, value->vtable);
178 sgen_get_remset ()->wbarrier_set_field ((GCObject*)arr, slot_ptr, value);
182 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
184 mono_gc_wbarrier_set_arrayref ((MonoArray*)obj, field_ptr, value);
188 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
190 sgen_wbarrier_value_copy_bitmap (_dest, _src, size, bitmap);
193 static MonoMethod *write_barrier_conc_method;
194 static MonoMethod *write_barrier_noconc_method;
197 sgen_is_critical_method (MonoMethod *method)
199 return (method == write_barrier_conc_method || method == write_barrier_noconc_method || sgen_is_managed_allocator (method));
203 sgen_has_critical_method (void)
205 return write_barrier_conc_method || write_barrier_noconc_method || sgen_has_managed_allocator ();
211 emit_nursery_check (MonoMethodBuilder *mb, int *nursery_check_return_labels, gboolean is_concurrent)
213 int shifted_nursery_start = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
215 memset (nursery_check_return_labels, 0, sizeof (int) * 2);
216 // if (ptr_in_nursery (ptr)) return;
218 * Masking out the bits might be faster, but we would have to use 64 bit
219 * immediates, which might be slower.
221 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
222 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_START);
223 mono_mb_emit_icon (mb, DEFAULT_NURSERY_BITS);
224 mono_mb_emit_byte (mb, CEE_SHR_UN);
225 mono_mb_emit_stloc (mb, shifted_nursery_start);
227 mono_mb_emit_ldarg (mb, 0);
228 mono_mb_emit_icon (mb, DEFAULT_NURSERY_BITS);
229 mono_mb_emit_byte (mb, CEE_SHR_UN);
230 mono_mb_emit_ldloc (mb, shifted_nursery_start);
231 nursery_check_return_labels [0] = mono_mb_emit_branch (mb, CEE_BEQ);
233 if (!is_concurrent) {
234 // if (!ptr_in_nursery (*ptr)) return;
235 mono_mb_emit_ldarg (mb, 0);
236 mono_mb_emit_byte (mb, CEE_LDIND_I);
237 mono_mb_emit_icon (mb, DEFAULT_NURSERY_BITS);
238 mono_mb_emit_byte (mb, CEE_SHR_UN);
239 mono_mb_emit_ldloc (mb, shifted_nursery_start);
240 nursery_check_return_labels [1] = mono_mb_emit_branch (mb, CEE_BNE_UN);
246 mono_gc_get_specific_write_barrier (gboolean is_concurrent)
249 MonoMethodBuilder *mb;
250 MonoMethodSignature *sig;
251 MonoMethod **write_barrier_method_addr;
252 #ifdef MANAGED_WBARRIER
253 int i, nursery_check_labels [2];
256 // FIXME: Maybe create a separate version for ctors (the branch would be
257 // correctly predicted more times)
259 write_barrier_method_addr = &write_barrier_conc_method;
261 write_barrier_method_addr = &write_barrier_noconc_method;
263 if (*write_barrier_method_addr)
264 return *write_barrier_method_addr;
266 /* Create the IL version of mono_gc_barrier_generic_store () */
267 sig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
268 sig->ret = &mono_defaults.void_class->byval_arg;
269 sig->params [0] = &mono_defaults.int_class->byval_arg;
272 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_conc", MONO_WRAPPER_WRITE_BARRIER);
274 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_noconc", MONO_WRAPPER_WRITE_BARRIER);
277 #ifdef MANAGED_WBARRIER
278 emit_nursery_check (mb, nursery_check_labels, is_concurrent);
280 addr = sgen_cardtable + ((address >> CARD_BITS) & CARD_MASK)
284 LDC_PTR sgen_cardtable
290 if (SGEN_HAVE_OVERLAPPING_CARDS) {
291 LDC_PTR card_table_mask
298 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
299 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_CARD_TABLE);
300 mono_mb_emit_ldarg (mb, 0);
301 mono_mb_emit_icon (mb, CARD_BITS);
302 mono_mb_emit_byte (mb, CEE_SHR_UN);
303 mono_mb_emit_byte (mb, CEE_CONV_I);
304 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
305 #if SIZEOF_VOID_P == 8
306 mono_mb_emit_icon8 (mb, CARD_MASK);
308 mono_mb_emit_icon (mb, CARD_MASK);
310 mono_mb_emit_byte (mb, CEE_CONV_I);
311 mono_mb_emit_byte (mb, CEE_AND);
313 mono_mb_emit_byte (mb, CEE_ADD);
314 mono_mb_emit_icon (mb, 1);
315 mono_mb_emit_byte (mb, CEE_STIND_I1);
318 for (i = 0; i < 2; ++i) {
319 if (nursery_check_labels [i])
320 mono_mb_patch_branch (mb, nursery_check_labels [i]);
322 mono_mb_emit_byte (mb, CEE_RET);
324 mono_mb_emit_ldarg (mb, 0);
325 mono_mb_emit_icall (mb, mono_gc_wbarrier_generic_nostore);
326 mono_mb_emit_byte (mb, CEE_RET);
329 res = mono_mb_create_method (mb, sig, 16);
333 if (*write_barrier_method_addr) {
334 /* Already created */
335 mono_free_method (res);
337 /* double-checked locking */
338 mono_memory_barrier ();
339 *write_barrier_method_addr = res;
343 return *write_barrier_method_addr;
347 mono_gc_get_write_barrier (void)
349 return mono_gc_get_specific_write_barrier (major_collector.is_concurrent);
353 * Dummy filler objects
356 /* Vtable of the objects used to fill out nursery fragments before a collection */
357 static GCVTable *array_fill_vtable;
360 get_array_fill_vtable (void)
362 if (!array_fill_vtable) {
363 static MonoClass klass;
364 static char _vtable[sizeof(MonoVTable)+8];
365 MonoVTable* vtable = (MonoVTable*) ALIGN_TO(_vtable, 8);
368 MonoDomain *domain = mono_get_root_domain ();
371 klass.element_class = mono_defaults.byte_class;
373 klass.instance_size = sizeof (MonoArray);
374 klass.sizes.element_size = 1;
375 klass.name = "array_filler_type";
377 vtable->klass = &klass;
379 vtable->gc_descr = mono_gc_make_descr_for_array (TRUE, &bmap, 0, 1);
382 array_fill_vtable = (GCVTable*)vtable;
384 return array_fill_vtable;
388 sgen_client_array_fill_range (char *start, size_t size)
392 if (size < sizeof (MonoArray)) {
393 memset (start, 0, size);
397 o = (MonoArray*)start;
398 o->obj.vtable = (MonoVTable*)get_array_fill_vtable ();
399 /* Mark this as not a real object */
400 o->obj.synchronisation = GINT_TO_POINTER (-1);
402 o->max_length = (mono_array_size_t)(size - sizeof (MonoArray));
408 sgen_client_zero_array_fill_header (void *p, size_t size)
410 if (size >= sizeof (MonoArray)) {
411 memset (p, 0, sizeof (MonoArray));
413 static guint8 zeros [sizeof (MonoArray)];
415 SGEN_ASSERT (0, !memcmp (p, zeros, size), "TLAB segment must be zeroed out.");
423 static MonoGCFinalizerCallbacks fin_callbacks;
426 mono_gc_get_vtable_bits (MonoClass *class)
429 /* FIXME move this to the bridge code */
430 if (sgen_need_bridge_processing ()) {
431 switch (sgen_bridge_class_kind (class)) {
432 case GC_BRIDGE_TRANSPARENT_BRIDGE_CLASS:
433 case GC_BRIDGE_OPAQUE_BRIDGE_CLASS:
434 res = SGEN_GC_BIT_BRIDGE_OBJECT;
436 case GC_BRIDGE_OPAQUE_CLASS:
437 res = SGEN_GC_BIT_BRIDGE_OPAQUE_OBJECT;
439 case GC_BRIDGE_TRANSPARENT_CLASS:
443 if (fin_callbacks.is_class_finalization_aware) {
444 if (fin_callbacks.is_class_finalization_aware (class))
445 res |= SGEN_GC_BIT_FINALIZER_AWARE;
451 is_finalization_aware (MonoObject *obj)
453 MonoVTable *vt = ((MonoVTable*)SGEN_LOAD_VTABLE (obj));
454 return (vt->gc_bits & SGEN_GC_BIT_FINALIZER_AWARE) == SGEN_GC_BIT_FINALIZER_AWARE;
458 sgen_client_object_queued_for_finalization (GCObject *obj)
460 if (fin_callbacks.object_queued_for_finalization && is_finalization_aware (obj))
461 fin_callbacks.object_queued_for_finalization (obj);
464 if (G_UNLIKELY (MONO_GC_FINALIZE_ENQUEUE_ENABLED ())) {
465 int gen = sgen_ptr_in_nursery (obj) ? GENERATION_NURSERY : GENERATION_OLD;
466 GCVTable *vt = (GCVTable*)SGEN_LOAD_VTABLE (obj);
467 MONO_GC_FINALIZE_ENQUEUE ((mword)obj, sgen_safe_object_get_size (obj),
468 sgen_client_vtable_get_namespace (vt), sgen_client_vtable_get_name (vt), gen,
469 sgen_client_object_has_critical_finalizer (obj));
475 mono_gc_register_finalizer_callbacks (MonoGCFinalizerCallbacks *callbacks)
477 if (callbacks->version != MONO_GC_FINALIZER_EXTENSION_VERSION)
478 g_error ("Invalid finalizer callback version. Expected %d but got %d\n", MONO_GC_FINALIZER_EXTENSION_VERSION, callbacks->version);
480 fin_callbacks = *callbacks;
484 sgen_client_run_finalize (MonoObject *obj)
486 mono_gc_run_finalize (obj, NULL);
490 mono_gc_invoke_finalizers (void)
492 return sgen_gc_invoke_finalizers ();
496 mono_gc_pending_finalizers (void)
498 return sgen_have_pending_finalizers ();
502 sgen_client_finalize_notify (void)
504 mono_gc_finalize_notify ();
508 mono_gc_register_for_finalization (MonoObject *obj, void *user_data)
510 sgen_object_register_for_finalization (obj, user_data);
514 object_in_domain_predicate (MonoObject *obj, void *user_data)
516 MonoDomain *domain = user_data;
517 if (mono_object_domain (obj) == domain) {
518 SGEN_LOG (5, "Unregistering finalizer for object: %p (%s)", obj, sgen_client_vtable_get_name (SGEN_LOAD_VTABLE (obj)));
525 * mono_gc_finalizers_for_domain:
526 * @domain: the unloading appdomain
527 * @out_array: output array
528 * @out_size: size of output array
530 * Store inside @out_array up to @out_size objects that belong to the unloading
531 * appdomain @domain. Returns the number of stored items. Can be called repeteadly
532 * until it returns 0.
533 * The items are removed from the finalizer data structure, so the caller is supposed
535 * @out_array should be on the stack to allow the GC to know the objects are still alive.
538 mono_gc_finalizers_for_domain (MonoDomain *domain, MonoObject **out_array, int out_size)
540 return sgen_gather_finalizers_if (object_in_domain_predicate, domain, out_array, out_size);
547 typedef struct _EphemeronLinkNode EphemeronLinkNode;
549 struct _EphemeronLinkNode {
550 EphemeronLinkNode *next;
559 static EphemeronLinkNode *ephemeron_list;
561 /* LOCKING: requires that the GC lock is held */
563 null_ephemerons_for_domain (MonoDomain *domain)
565 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
568 MonoObject *object = (MonoObject*)current->array;
571 SGEN_ASSERT (0, object->vtable, "Can't have objects without vtables.");
573 if (object && object->vtable->domain == domain) {
574 EphemeronLinkNode *tmp = current;
577 prev->next = current->next;
579 ephemeron_list = current->next;
581 current = current->next;
582 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
585 current = current->next;
590 /* LOCKING: requires that the GC lock is held */
592 sgen_client_clear_unreachable_ephemerons (ScanCopyContext ctx)
594 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
595 SgenGrayQueue *queue = ctx.queue;
596 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
598 Ephemeron *cur, *array_end;
602 char *object = current->array;
604 if (!sgen_is_object_alive_for_current_gen (object)) {
605 EphemeronLinkNode *tmp = current;
607 SGEN_LOG (5, "Dead Ephemeron array at %p", object);
610 prev->next = current->next;
612 ephemeron_list = current->next;
614 current = current->next;
615 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
620 copy_func ((void**)&object, queue);
621 current->array = object;
623 SGEN_LOG (5, "Clearing unreachable entries for ephemeron array at %p", object);
625 array = (MonoArray*)object;
626 cur = mono_array_addr (array, Ephemeron, 0);
627 array_end = cur + mono_array_length_fast (array);
628 tombstone = (char*)((MonoVTable*)SGEN_LOAD_VTABLE (object))->domain->ephemeron_tombstone;
630 for (; cur < array_end; ++cur) {
631 char *key = (char*)cur->key;
633 if (!key || key == tombstone)
636 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
637 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
638 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
640 if (!sgen_is_object_alive_for_current_gen (key)) {
641 cur->key = tombstone;
647 current = current->next;
652 LOCKING: requires that the GC lock is held
654 Limitations: We scan all ephemerons on every collection since the current design doesn't allow for a simple nursery/mature split.
657 sgen_client_mark_ephemerons (ScanCopyContext ctx)
659 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
660 SgenGrayQueue *queue = ctx.queue;
661 gboolean nothing_marked = TRUE;
662 EphemeronLinkNode *current = ephemeron_list;
664 Ephemeron *cur, *array_end;
667 for (current = ephemeron_list; current; current = current->next) {
668 char *object = current->array;
669 SGEN_LOG (5, "Ephemeron array at %p", object);
671 /*It has to be alive*/
672 if (!sgen_is_object_alive_for_current_gen (object)) {
673 SGEN_LOG (5, "\tnot reachable");
677 copy_func ((void**)&object, queue);
679 array = (MonoArray*)object;
680 cur = mono_array_addr (array, Ephemeron, 0);
681 array_end = cur + mono_array_length_fast (array);
682 tombstone = (char*)((MonoVTable*)SGEN_LOAD_VTABLE (object))->domain->ephemeron_tombstone;
684 for (; cur < array_end; ++cur) {
685 char *key = cur->key;
687 if (!key || key == tombstone)
690 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
691 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
692 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
694 if (sgen_is_object_alive_for_current_gen (key)) {
695 char *value = cur->value;
697 copy_func ((void**)&cur->key, queue);
699 if (!sgen_is_object_alive_for_current_gen (value))
700 nothing_marked = FALSE;
701 copy_func ((void**)&cur->value, queue);
707 SGEN_LOG (5, "Ephemeron run finished. Is it done %d", nothing_marked);
708 return nothing_marked;
712 mono_gc_ephemeron_array_add (MonoObject *obj)
714 EphemeronLinkNode *node;
718 node = sgen_alloc_internal (INTERNAL_MEM_EPHEMERON_LINK);
723 node->array = (char*)obj;
724 node->next = ephemeron_list;
725 ephemeron_list = node;
727 SGEN_LOG (5, "Registered ephemeron array %p", obj);
738 mono_gc_set_current_thread_appdomain (MonoDomain *domain)
740 SgenThreadInfo *info = mono_thread_info_current ();
742 /* Could be called from sgen_thread_unregister () with a NULL info */
745 info->client_info.stopped_domain = domain;
750 need_remove_object_for_domain (char *start, MonoDomain *domain)
752 if (mono_object_domain (start) == domain) {
753 SGEN_LOG (4, "Need to cleanup object %p", start);
754 binary_protocol_cleanup (start, (gpointer)SGEN_LOAD_VTABLE (start), sgen_safe_object_get_size ((GCObject*)start));
761 process_object_for_domain_clearing (char *start, MonoDomain *domain)
763 MonoVTable *vt = (MonoVTable*)SGEN_LOAD_VTABLE (start);
764 if (vt->klass == mono_defaults.internal_thread_class)
765 g_assert (mono_object_domain (start) == mono_get_root_domain ());
766 /* The object could be a proxy for an object in the domain
768 #ifndef DISABLE_REMOTING
769 if (mono_defaults.real_proxy_class->supertypes && mono_class_has_parent_fast (vt->klass, mono_defaults.real_proxy_class)) {
770 MonoObject *server = ((MonoRealProxy*)start)->unwrapped_server;
772 /* The server could already have been zeroed out, so
773 we need to check for that, too. */
774 if (server && (!SGEN_LOAD_VTABLE (server) || mono_object_domain (server) == domain)) {
775 SGEN_LOG (4, "Cleaning up remote pointer in %p to object %p", start, server);
776 ((MonoRealProxy*)start)->unwrapped_server = NULL;
783 clear_domain_process_object (char *obj, MonoDomain *domain)
787 process_object_for_domain_clearing (obj, domain);
788 remove = need_remove_object_for_domain (obj, domain);
790 if (remove && ((MonoObject*)obj)->synchronisation) {
791 void **dislink = mono_monitor_get_object_monitor_weak_link ((MonoObject*)obj);
793 sgen_register_disappearing_link (NULL, dislink, FALSE, TRUE);
800 clear_domain_process_minor_object_callback (char *obj, size_t size, MonoDomain *domain)
802 if (clear_domain_process_object (obj, domain)) {
803 CANARIFY_SIZE (size);
804 memset (obj, 0, size);
809 clear_domain_process_major_object_callback (char *obj, size_t size, MonoDomain *domain)
811 clear_domain_process_object (obj, domain);
815 clear_domain_free_major_non_pinned_object_callback (char *obj, size_t size, MonoDomain *domain)
817 if (need_remove_object_for_domain (obj, domain))
818 major_collector.free_non_pinned_object (obj, size);
822 clear_domain_free_major_pinned_object_callback (char *obj, size_t size, MonoDomain *domain)
824 if (need_remove_object_for_domain (obj, domain))
825 major_collector.free_pinned_object (obj, size);
829 * When appdomains are unloaded we can easily remove objects that have finalizers,
830 * but all the others could still be present in random places on the heap.
831 * We need a sweep to get rid of them even though it's going to be costly
833 * The reason we need to remove them is because we access the vtable and class
834 * structures to know the object size and the reference bitmap: once the domain is
835 * unloaded the point to random memory.
838 mono_gc_clear_domain (MonoDomain * domain)
840 LOSObject *bigobj, *prev;
845 binary_protocol_domain_unload_begin (domain);
849 if (sgen_concurrent_collection_in_progress ())
850 sgen_perform_collection (0, GENERATION_OLD, "clear domain", TRUE);
851 SGEN_ASSERT (0, !sgen_concurrent_collection_in_progress (), "We just ordered a synchronous collection. Why are we collecting concurrently?");
853 major_collector.finish_sweeping ();
855 sgen_process_fin_stage_entries ();
856 sgen_process_dislink_stage_entries ();
858 sgen_clear_nursery_fragments ();
860 if (sgen_mono_xdomain_checks && domain != mono_get_root_domain ()) {
861 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_NORMAL);
862 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_WBARRIER);
863 sgen_check_for_xdomain_refs ();
866 /*Ephemerons and dislinks must be processed before LOS since they might end up pointing
867 to memory returned to the OS.*/
868 null_ephemerons_for_domain (domain);
870 for (i = GENERATION_NURSERY; i < GENERATION_MAX; ++i)
871 sgen_null_links_if (object_in_domain_predicate, domain, i);
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);
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 (bigobj->data, domain);
891 for (bigobj = los_object_list; bigobj;) {
892 if (need_remove_object_for_domain (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))
940 mono_profiler_allocation (obj);
946 mono_gc_alloc_pinned_obj (MonoVTable *vtable, size_t size)
948 MonoObject *obj = sgen_alloc_obj_pinned (vtable, size);
950 if (G_UNLIKELY (alloc_events))
951 mono_profiler_allocation (obj);
957 mono_gc_alloc_mature (MonoVTable *vtable)
959 MonoObject *obj = sgen_alloc_obj_mature (vtable, vtable->klass->instance_size);
961 if (obj && G_UNLIKELY (obj->vtable->klass->has_finalize))
962 mono_object_register_finalizer (obj);
964 if (G_UNLIKELY (alloc_events))
965 mono_profiler_allocation (obj);
971 mono_gc_alloc_fixed (size_t size, void *descr)
973 /* FIXME: do a single allocation */
974 void *res = calloc (1, size);
977 if (!mono_gc_register_root (res, size, descr)) {
985 mono_gc_free_fixed (void* addr)
987 mono_gc_deregister_root (addr);
995 static MonoMethod* alloc_method_cache [ATYPE_NUM];
996 static MonoMethod* slowpath_alloc_method_cache [ATYPE_NUM];
997 static gboolean use_managed_allocator = TRUE;
999 #ifdef MANAGED_ALLOCATION
1001 #ifdef HAVE_KW_THREAD
1003 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { \
1004 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1005 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1006 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_TLAB_NEXT_ADDR); \
1009 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { \
1010 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1011 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1012 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_TLAB_TEMP_END); \
1017 #if defined(__APPLE__) || defined (HOST_WIN32)
1018 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { \
1019 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1020 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1021 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1022 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_next_addr)); \
1023 mono_mb_emit_byte ((mb), CEE_ADD); \
1024 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1027 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { \
1028 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1029 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1030 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1031 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_temp_end)); \
1032 mono_mb_emit_byte ((mb), CEE_ADD); \
1033 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1037 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1038 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1043 /* FIXME: Do this in the JIT, where specialized allocation sequences can be created
1044 * for each class. This is currently not easy to do, as it is hard to generate basic
1045 * blocks + branches, but it is easy with the linear IL codebase.
1047 * For this to work we'd need to solve the TLAB race, first. Now we
1048 * require the allocator to be in a few known methods to make sure
1049 * that they are executed atomically via the restart mechanism.
1052 create_allocator (int atype, gboolean slowpath)
1054 int p_var, size_var;
1055 guint32 slowpath_branch, max_size_branch;
1056 MonoMethodBuilder *mb;
1058 MonoMethodSignature *csig;
1059 static gboolean registered = FALSE;
1060 int tlab_next_addr_var, new_next_var;
1061 const char *name = NULL;
1062 AllocatorWrapperInfo *info;
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 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
1084 if (atype == ATYPE_STRING) {
1085 csig->ret = &mono_defaults.string_class->byval_arg;
1086 csig->params [0] = &mono_defaults.int_class->byval_arg;
1087 csig->params [1] = &mono_defaults.int32_class->byval_arg;
1089 csig->ret = &mono_defaults.object_class->byval_arg;
1090 csig->params [0] = &mono_defaults.int_class->byval_arg;
1091 csig->params [1] = &mono_defaults.int_class->byval_arg;
1094 mb = mono_mb_new (mono_defaults.object_class, name, MONO_WRAPPER_ALLOC);
1101 mono_mb_emit_ldarg (mb, 0);
1102 mono_mb_emit_icall (mb, mono_object_new_specific);
1105 mono_mb_emit_ldarg (mb, 0);
1106 mono_mb_emit_ldarg (mb, 1);
1107 mono_mb_emit_icall (mb, mono_array_new_specific);
1110 mono_mb_emit_ldarg (mb, 1);
1111 mono_mb_emit_icall (mb, mono_string_alloc);
1114 g_assert_not_reached ();
1120 size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1121 if (atype == ATYPE_SMALL) {
1122 /* size_var = size_arg */
1123 mono_mb_emit_ldarg (mb, 1);
1124 mono_mb_emit_stloc (mb, size_var);
1125 } else if (atype == ATYPE_NORMAL) {
1126 /* size = vtable->klass->instance_size; */
1127 mono_mb_emit_ldarg (mb, 0);
1128 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1129 mono_mb_emit_byte (mb, CEE_ADD);
1130 mono_mb_emit_byte (mb, CEE_LDIND_I);
1131 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, instance_size));
1132 mono_mb_emit_byte (mb, CEE_ADD);
1133 /* FIXME: assert instance_size stays a 4 byte integer */
1134 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1135 mono_mb_emit_byte (mb, CEE_CONV_I);
1136 mono_mb_emit_stloc (mb, size_var);
1137 } else if (atype == ATYPE_VECTOR) {
1138 MonoExceptionClause *clause;
1139 int pos, pos_leave, pos_error;
1140 MonoClass *oom_exc_class;
1144 * n > MONO_ARRAY_MAX_INDEX => OutOfMemoryException
1145 * n < 0 => OverflowException
1147 * We can do an unsigned comparison to catch both cases, then in the error
1148 * case compare signed to distinguish between them.
1150 mono_mb_emit_ldarg (mb, 1);
1151 mono_mb_emit_icon (mb, MONO_ARRAY_MAX_INDEX);
1152 mono_mb_emit_byte (mb, CEE_CONV_U);
1153 pos = mono_mb_emit_short_branch (mb, CEE_BLE_UN_S);
1155 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1156 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1157 mono_mb_emit_ldarg (mb, 1);
1158 mono_mb_emit_icon (mb, 0);
1159 pos_error = mono_mb_emit_short_branch (mb, CEE_BLT_S);
1160 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1161 mono_mb_patch_short_branch (mb, pos_error);
1162 mono_mb_emit_exception (mb, "OverflowException", NULL);
1164 mono_mb_patch_short_branch (mb, pos);
1166 clause = mono_image_alloc0 (mono_defaults.corlib, sizeof (MonoExceptionClause));
1167 clause->try_offset = mono_mb_get_label (mb);
1169 /* vtable->klass->sizes.element_size */
1170 mono_mb_emit_ldarg (mb, 0);
1171 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1172 mono_mb_emit_byte (mb, CEE_ADD);
1173 mono_mb_emit_byte (mb, CEE_LDIND_I);
1174 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, sizes));
1175 mono_mb_emit_byte (mb, CEE_ADD);
1176 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1177 mono_mb_emit_byte (mb, CEE_CONV_I);
1180 mono_mb_emit_ldarg (mb, 1);
1181 mono_mb_emit_byte (mb, CEE_MUL_OVF_UN);
1182 /* + sizeof (MonoArray) */
1183 mono_mb_emit_icon (mb, sizeof (MonoArray));
1184 mono_mb_emit_byte (mb, CEE_ADD_OVF_UN);
1185 mono_mb_emit_stloc (mb, size_var);
1187 pos_leave = mono_mb_emit_branch (mb, CEE_LEAVE);
1190 clause->flags = MONO_EXCEPTION_CLAUSE_NONE;
1191 clause->try_len = mono_mb_get_pos (mb) - clause->try_offset;
1192 clause->data.catch_class = mono_class_from_name (mono_defaults.corlib,
1193 "System", "OverflowException");
1194 g_assert (clause->data.catch_class);
1195 clause->handler_offset = mono_mb_get_label (mb);
1197 oom_exc_class = mono_class_from_name (mono_defaults.corlib,
1198 "System", "OutOfMemoryException");
1199 g_assert (oom_exc_class);
1200 ctor = mono_class_get_method_from_name (oom_exc_class, ".ctor", 0);
1203 mono_mb_emit_byte (mb, CEE_POP);
1204 mono_mb_emit_op (mb, CEE_NEWOBJ, ctor);
1205 mono_mb_emit_byte (mb, CEE_THROW);
1207 clause->handler_len = mono_mb_get_pos (mb) - clause->handler_offset;
1208 mono_mb_set_clauses (mb, 1, clause);
1209 mono_mb_patch_branch (mb, pos_leave);
1211 } else if (atype == ATYPE_STRING) {
1215 * a string allocator method takes the args: (vtable, len)
1217 * bytes = offsetof (MonoString, chars) + ((len + 1) * 2)
1221 * bytes <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1225 * offsetof (MonoString, chars) + ((len + 1) * 2) <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1226 * len <= (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - offsetof (MonoString, chars)) / 2 - 1
1228 mono_mb_emit_ldarg (mb, 1);
1229 mono_mb_emit_icon (mb, (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - MONO_STRUCT_OFFSET (MonoString, chars)) / 2 - 1);
1230 pos = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
1232 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1233 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1234 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1235 mono_mb_patch_short_branch (mb, pos);
1237 mono_mb_emit_ldarg (mb, 1);
1238 mono_mb_emit_icon (mb, 1);
1239 mono_mb_emit_byte (mb, MONO_CEE_SHL);
1240 //WE manually fold the above + 2 here
1241 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, chars) + 2);
1242 mono_mb_emit_byte (mb, CEE_ADD);
1243 mono_mb_emit_stloc (mb, size_var);
1245 g_assert_not_reached ();
1248 if (atype != ATYPE_SMALL) {
1249 /* size += ALLOC_ALIGN - 1; */
1250 mono_mb_emit_ldloc (mb, size_var);
1251 mono_mb_emit_icon (mb, SGEN_ALLOC_ALIGN - 1);
1252 mono_mb_emit_byte (mb, CEE_ADD);
1253 /* size &= ~(ALLOC_ALIGN - 1); */
1254 mono_mb_emit_icon (mb, ~(SGEN_ALLOC_ALIGN - 1));
1255 mono_mb_emit_byte (mb, CEE_AND);
1256 mono_mb_emit_stloc (mb, size_var);
1259 /* if (size > MAX_SMALL_OBJ_SIZE) goto slowpath */
1260 if (atype != ATYPE_SMALL) {
1261 mono_mb_emit_ldloc (mb, size_var);
1262 mono_mb_emit_icon (mb, SGEN_MAX_SMALL_OBJ_SIZE);
1263 max_size_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
1267 * We need to modify tlab_next, but the JIT only supports reading, so we read
1268 * another tls var holding its address instead.
1271 /* tlab_next_addr (local) = tlab_next_addr (TLS var) */
1272 tlab_next_addr_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1273 EMIT_TLS_ACCESS_NEXT_ADDR (mb);
1274 mono_mb_emit_stloc (mb, tlab_next_addr_var);
1276 /* p = (void**)tlab_next; */
1277 p_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1278 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1279 mono_mb_emit_byte (mb, CEE_LDIND_I);
1280 mono_mb_emit_stloc (mb, p_var);
1282 /* new_next = (char*)p + size; */
1283 new_next_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1284 mono_mb_emit_ldloc (mb, p_var);
1285 mono_mb_emit_ldloc (mb, size_var);
1286 mono_mb_emit_byte (mb, CEE_CONV_I);
1287 mono_mb_emit_byte (mb, CEE_ADD);
1288 mono_mb_emit_stloc (mb, new_next_var);
1290 /* if (G_LIKELY (new_next < tlab_temp_end)) */
1291 mono_mb_emit_ldloc (mb, new_next_var);
1292 EMIT_TLS_ACCESS_TEMP_END (mb);
1293 slowpath_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
1296 if (atype != ATYPE_SMALL)
1297 mono_mb_patch_short_branch (mb, max_size_branch);
1299 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1300 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1302 /* FIXME: mono_gc_alloc_obj takes a 'size_t' as an argument, not an int32 */
1303 mono_mb_emit_ldarg (mb, 0);
1304 mono_mb_emit_ldloc (mb, size_var);
1305 if (atype == ATYPE_NORMAL || atype == ATYPE_SMALL) {
1306 mono_mb_emit_icall (mb, mono_gc_alloc_obj);
1307 } else if (atype == ATYPE_VECTOR) {
1308 mono_mb_emit_ldarg (mb, 1);
1309 mono_mb_emit_icall (mb, mono_gc_alloc_vector);
1310 } else if (atype == ATYPE_STRING) {
1311 mono_mb_emit_ldarg (mb, 1);
1312 mono_mb_emit_icall (mb, mono_gc_alloc_string);
1314 g_assert_not_reached ();
1316 mono_mb_emit_byte (mb, CEE_RET);
1319 mono_mb_patch_short_branch (mb, slowpath_branch);
1321 /* FIXME: Memory barrier */
1323 /* tlab_next = new_next */
1324 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1325 mono_mb_emit_ldloc (mb, new_next_var);
1326 mono_mb_emit_byte (mb, CEE_STIND_I);
1328 /*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. */
1329 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1330 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1331 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1334 mono_mb_emit_ldloc (mb, p_var);
1335 mono_mb_emit_ldarg (mb, 0);
1336 mono_mb_emit_byte (mb, CEE_STIND_I);
1338 if (atype == ATYPE_VECTOR) {
1339 /* arr->max_length = max_length; */
1340 mono_mb_emit_ldloc (mb, p_var);
1341 mono_mb_emit_ldflda (mb, MONO_STRUCT_OFFSET (MonoArray, max_length));
1342 mono_mb_emit_ldarg (mb, 1);
1343 #ifdef MONO_BIG_ARRAYS
1344 mono_mb_emit_byte (mb, CEE_STIND_I);
1346 mono_mb_emit_byte (mb, CEE_STIND_I4);
1348 } else if (atype == ATYPE_STRING) {
1349 /* need to set length and clear the last char */
1350 /* s->length = len; */
1351 mono_mb_emit_ldloc (mb, p_var);
1352 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, length));
1353 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1354 mono_mb_emit_ldarg (mb, 1);
1355 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
1356 /* s->chars [len] = 0; */
1357 mono_mb_emit_ldloc (mb, p_var);
1358 mono_mb_emit_ldloc (mb, size_var);
1359 mono_mb_emit_icon (mb, 2);
1360 mono_mb_emit_byte (mb, MONO_CEE_SUB);
1361 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1362 mono_mb_emit_icon (mb, 0);
1363 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
1367 We must make sure both vtable and max_length are globaly visible before returning to managed land.
1369 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1370 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1371 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1374 mono_mb_emit_ldloc (mb, p_var);
1377 mono_mb_emit_byte (mb, CEE_RET);
1380 res = mono_mb_create_method (mb, csig, 8);
1382 mono_method_get_header (res)->init_locals = FALSE;
1384 info = mono_image_alloc0 (mono_defaults.corlib, sizeof (AllocatorWrapperInfo));
1385 info->gc_name = "sgen";
1386 info->alloc_type = atype;
1387 mono_marshal_set_wrapper_info (res, info);
1394 mono_gc_get_aligned_size_for_allocator (int size)
1396 int aligned_size = size;
1397 aligned_size += SGEN_ALLOC_ALIGN - 1;
1398 aligned_size &= ~(SGEN_ALLOC_ALIGN - 1);
1399 return aligned_size;
1403 * Generate an allocator method implementing the fast path of mono_gc_alloc_obj ().
1404 * The signature of the called method is:
1405 * object allocate (MonoVTable *vtable)
1408 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box, gboolean known_instance_size)
1410 #ifdef MANAGED_ALLOCATION
1411 if (collect_before_allocs)
1413 if (!mono_runtime_has_tls_get ())
1415 if (klass->instance_size > tlab_size)
1417 if (known_instance_size && ALIGN_TO (klass->instance_size, SGEN_ALLOC_ALIGN) >= SGEN_MAX_SMALL_OBJ_SIZE)
1419 if (klass->has_finalize || mono_class_is_marshalbyref (klass) || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
1423 if (klass->byval_arg.type == MONO_TYPE_STRING)
1424 return mono_gc_get_managed_allocator_by_type (ATYPE_STRING, FALSE);
1425 /* Generic classes have dynamic field and can go above MAX_SMALL_OBJ_SIZE. */
1426 if (known_instance_size)
1427 return mono_gc_get_managed_allocator_by_type (ATYPE_SMALL, FALSE);
1429 return mono_gc_get_managed_allocator_by_type (ATYPE_NORMAL, FALSE);
1436 mono_gc_get_managed_array_allocator (MonoClass *klass)
1438 #ifdef MANAGED_ALLOCATION
1439 if (klass->rank != 1)
1441 if (!mono_runtime_has_tls_get ())
1443 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1445 if (has_per_allocation_action)
1447 g_assert (!mono_class_has_finalizer (klass) && !mono_class_is_marshalbyref (klass));
1449 return mono_gc_get_managed_allocator_by_type (ATYPE_VECTOR, FALSE);
1456 sgen_set_use_managed_allocator (gboolean flag)
1458 use_managed_allocator = flag;
1462 mono_gc_get_managed_allocator_by_type (int atype, gboolean slowpath)
1464 #ifdef MANAGED_ALLOCATION
1466 MonoMethod **cache = slowpath ? slowpath_alloc_method_cache : alloc_method_cache;
1468 if (!use_managed_allocator)
1471 if (!mono_runtime_has_tls_get ())
1474 res = cache [atype];
1478 res = create_allocator (atype, slowpath);
1480 if (cache [atype]) {
1481 mono_free_method (res);
1482 res = cache [atype];
1484 mono_memory_barrier ();
1485 cache [atype] = res;
1496 mono_gc_get_managed_allocator_types (void)
1502 sgen_is_managed_allocator (MonoMethod *method)
1506 for (i = 0; i < ATYPE_NUM; ++i)
1507 if (method == alloc_method_cache [i] || method == slowpath_alloc_method_cache [i])
1513 sgen_has_managed_allocator (void)
1517 for (i = 0; i < ATYPE_NUM; ++i)
1518 if (alloc_method_cache [i] || slowpath_alloc_method_cache [i])
1524 * Cardtable scanning
1527 #define MWORD_MASK (sizeof (mword) - 1)
1530 find_card_offset (mword card)
1532 /*XXX Use assembly as this generates some pretty bad code */
1533 #if defined(__i386__) && defined(__GNUC__)
1534 return (__builtin_ffs (card) - 1) / 8;
1535 #elif defined(__x86_64__) && defined(__GNUC__)
1536 return (__builtin_ffsll (card) - 1) / 8;
1537 #elif defined(__s390x__)
1538 return (__builtin_ffsll (GUINT64_TO_LE(card)) - 1) / 8;
1541 guint8 *ptr = (guint8 *) &card;
1542 for (i = 0; i < sizeof (mword); ++i) {
1551 find_next_card (guint8 *card_data, guint8 *end)
1553 mword *cards, *cards_end;
1556 while ((((mword)card_data) & MWORD_MASK) && card_data < end) {
1562 if (card_data == end)
1565 cards = (mword*)card_data;
1566 cards_end = (mword*)((mword)end & ~MWORD_MASK);
1567 while (cards < cards_end) {
1570 return (guint8*)cards + find_card_offset (card);
1574 card_data = (guint8*)cards_end;
1575 while (card_data < end) {
1584 #define ARRAY_OBJ_INDEX(ptr,array,elem_size) (((char*)(ptr) - ((char*)(array) + G_STRUCT_OFFSET (MonoArray, vector))) / (elem_size))
1587 sgen_client_cardtable_scan_object (char *obj, mword block_obj_size, guint8 *cards, gboolean mod_union, ScanCopyContext ctx)
1589 MonoVTable *vt = (MonoVTable*)SGEN_LOAD_VTABLE (obj);
1590 MonoClass *klass = vt->klass;
1592 SGEN_ASSERT (0, SGEN_VTABLE_HAS_REFERENCES ((GCVTable*)vt), "Why would we ever call this on reference-free objects?");
1595 guint8 *card_data, *card_base;
1596 guint8 *card_data_end;
1597 char *obj_start = sgen_card_table_align_pointer (obj);
1598 mword obj_size = sgen_client_par_object_get_size (vt, (GCObject*)obj);
1599 char *obj_end = obj + obj_size;
1601 size_t extra_idx = 0;
1603 MonoArray *arr = (MonoArray*)obj;
1604 mword desc = (mword)klass->element_class->gc_descr;
1605 int elem_size = mono_array_element_size (klass);
1607 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1608 guint8 *overflow_scan_end = NULL;
1611 #ifdef SGEN_OBJECT_LAYOUT_STATISTICS
1612 if (klass->element_class->valuetype)
1613 sgen_object_layout_scanned_vtype_array ();
1615 sgen_object_layout_scanned_ref_array ();
1621 card_data = sgen_card_table_get_card_scan_address ((mword)obj);
1623 card_base = card_data;
1624 card_count = sgen_card_table_number_of_cards_in_range ((mword)obj, obj_size);
1625 card_data_end = card_data + card_count;
1628 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1629 /*Check for overflow and if so, setup to scan in two steps*/
1630 if (!cards && card_data_end >= SGEN_SHADOW_CARDTABLE_END) {
1631 overflow_scan_end = sgen_shadow_cardtable + (card_data_end - SGEN_SHADOW_CARDTABLE_END);
1632 card_data_end = SGEN_SHADOW_CARDTABLE_END;
1638 card_data = find_next_card (card_data, card_data_end);
1639 for (; card_data < card_data_end; card_data = find_next_card (card_data + 1, card_data_end)) {
1641 size_t idx = (card_data - card_base) + extra_idx;
1642 char *start = (char*)(obj_start + idx * CARD_SIZE_IN_BYTES);
1643 char *card_end = start + CARD_SIZE_IN_BYTES;
1644 char *first_elem, *elem;
1646 HEAVY_STAT (++los_marked_cards);
1649 sgen_card_table_prepare_card_for_scanning (card_data);
1651 card_end = MIN (card_end, obj_end);
1653 if (start <= (char*)arr->vector)
1656 index = ARRAY_OBJ_INDEX (start, obj, elem_size);
1658 elem = first_elem = (char*)mono_array_addr_with_size_fast ((MonoArray*)obj, elem_size, index);
1659 if (klass->element_class->valuetype) {
1660 ScanVTypeFunc scan_vtype_func = ctx.ops->scan_vtype;
1662 for (; elem < card_end; elem += elem_size)
1663 scan_vtype_func (obj, elem, desc, ctx.queue BINARY_PROTOCOL_ARG (elem_size));
1665 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
1667 HEAVY_STAT (++los_array_cards);
1668 for (; elem < card_end; elem += SIZEOF_VOID_P) {
1669 gpointer new, old = *(gpointer*)elem;
1670 if ((mod_union && old) || G_UNLIKELY (sgen_ptr_in_nursery (old))) {
1671 HEAVY_STAT (++los_array_remsets);
1672 copy_func ((void**)elem, ctx.queue);
1673 new = *(gpointer*)elem;
1674 if (G_UNLIKELY (sgen_ptr_in_nursery (new)))
1675 sgen_add_to_global_remset (elem, new);
1680 binary_protocol_card_scan (first_elem, elem - first_elem);
1683 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1684 if (overflow_scan_end) {
1685 extra_idx = card_data - card_base;
1686 card_base = card_data = sgen_shadow_cardtable;
1687 card_data_end = overflow_scan_end;
1688 overflow_scan_end = NULL;
1699 * Array and string allocation
1703 mono_gc_alloc_vector (MonoVTable *vtable, size_t size, uintptr_t max_length)
1708 if (!SGEN_CAN_ALIGN_UP (size))
1711 #ifndef DISABLE_CRITICAL_REGION
1712 ENTER_CRITICAL_REGION;
1713 arr = sgen_try_alloc_obj_nolock ((GCVTable*)vtable, size);
1715 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1716 arr->max_length = (mono_array_size_t)max_length;
1717 EXIT_CRITICAL_REGION;
1720 EXIT_CRITICAL_REGION;
1725 arr = sgen_alloc_obj_nolock ((GCVTable*)vtable, size);
1726 if (G_UNLIKELY (!arr)) {
1728 return mono_gc_out_of_memory (size);
1731 arr->max_length = (mono_array_size_t)max_length;
1736 if (G_UNLIKELY (alloc_events))
1737 mono_profiler_allocation (&arr->obj);
1739 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size ((GCVTable*)vtable, (GCObject*)arr)), "Vector has incorrect size.");
1744 mono_gc_alloc_array (MonoVTable *vtable, size_t size, uintptr_t max_length, uintptr_t bounds_size)
1747 MonoArrayBounds *bounds;
1750 if (!SGEN_CAN_ALIGN_UP (size))
1753 #ifndef DISABLE_CRITICAL_REGION
1754 ENTER_CRITICAL_REGION;
1755 arr = sgen_try_alloc_obj_nolock ((GCVTable*)vtable, size);
1757 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1758 arr->max_length = (mono_array_size_t)max_length;
1760 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1761 arr->bounds = bounds;
1762 EXIT_CRITICAL_REGION;
1765 EXIT_CRITICAL_REGION;
1770 arr = sgen_alloc_obj_nolock ((GCVTable*)vtable, size);
1771 if (G_UNLIKELY (!arr)) {
1773 return mono_gc_out_of_memory (size);
1776 arr->max_length = (mono_array_size_t)max_length;
1778 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1779 arr->bounds = bounds;
1784 if (G_UNLIKELY (alloc_events))
1785 mono_profiler_allocation (&arr->obj);
1787 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size ((GCVTable*)vtable, (GCObject*)arr)), "Array has incorrect size.");
1792 mono_gc_alloc_string (MonoVTable *vtable, size_t size, gint32 len)
1797 if (!SGEN_CAN_ALIGN_UP (size))
1800 #ifndef DISABLE_CRITICAL_REGION
1801 ENTER_CRITICAL_REGION;
1802 str = sgen_try_alloc_obj_nolock ((GCVTable*)vtable, size);
1804 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1806 EXIT_CRITICAL_REGION;
1809 EXIT_CRITICAL_REGION;
1814 str = sgen_alloc_obj_nolock ((GCVTable*)vtable, size);
1815 if (G_UNLIKELY (!str)) {
1817 return mono_gc_out_of_memory (size);
1825 if (G_UNLIKELY (alloc_events))
1826 mono_profiler_allocation (&str->object);
1836 mono_gc_set_string_length (MonoString *str, gint32 new_length)
1838 mono_unichar2 *new_end = str->chars + new_length;
1840 /* zero the discarded string. This null-delimits the string and allows
1841 * the space to be reclaimed by SGen. */
1843 if (nursery_canaries_enabled () && sgen_ptr_in_nursery (str)) {
1844 CHECK_CANARY_FOR_OBJECT (str);
1845 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2) + CANARY_SIZE);
1846 memcpy (new_end + 1 , CANARY_STRING, CANARY_SIZE);
1848 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2));
1851 str->length = new_length;
1858 #define GC_ROOT_NUM 32
1860 int count; /* must be the first field */
1861 void *objects [GC_ROOT_NUM];
1862 int root_types [GC_ROOT_NUM];
1863 uintptr_t extra_info [GC_ROOT_NUM];
1867 notify_gc_roots (GCRootReport *report)
1871 mono_profiler_gc_roots (report->count, report->objects, report->root_types, report->extra_info);
1876 add_profile_gc_root (GCRootReport *report, void *object, int rtype, uintptr_t extra_info)
1878 if (report->count == GC_ROOT_NUM)
1879 notify_gc_roots (report);
1880 report->objects [report->count] = object;
1881 report->root_types [report->count] = rtype;
1882 report->extra_info [report->count++] = (uintptr_t)((MonoVTable*)SGEN_LOAD_VTABLE (object))->klass;
1886 sgen_client_nursery_objects_pinned (void **definitely_pinned, int count)
1888 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS) {
1889 GCRootReport report;
1892 for (idx = 0; idx < count; ++idx)
1893 add_profile_gc_root (&report, definitely_pinned [idx], MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
1894 notify_gc_roots (&report);
1899 report_finalizer_roots_from_queue (SgenPointerQueue *queue)
1901 GCRootReport report;
1905 for (i = 0; i < queue->next_slot; ++i) {
1906 void *obj = queue->data [i];
1909 add_profile_gc_root (&report, obj, MONO_PROFILE_GC_ROOT_FINALIZER, 0);
1911 notify_gc_roots (&report);
1915 report_finalizer_roots (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
1917 report_finalizer_roots_from_queue (fin_ready_queue);
1918 report_finalizer_roots_from_queue (critical_fin_queue);
1921 static GCRootReport *root_report;
1924 single_arg_report_root (void **obj, void *gc_data)
1927 add_profile_gc_root (root_report, *obj, MONO_PROFILE_GC_ROOT_OTHER, 0);
1931 precisely_report_roots_from (GCRootReport *report, void** start_root, void** end_root, mword desc)
1933 switch (desc & ROOT_DESC_TYPE_MASK) {
1934 case ROOT_DESC_BITMAP:
1935 desc >>= ROOT_DESC_TYPE_SHIFT;
1937 if ((desc & 1) && *start_root) {
1938 add_profile_gc_root (report, *start_root, MONO_PROFILE_GC_ROOT_OTHER, 0);
1944 case ROOT_DESC_COMPLEX: {
1945 gsize *bitmap_data = sgen_get_complex_descriptor_bitmap (desc);
1946 gsize bwords = (*bitmap_data) - 1;
1947 void **start_run = start_root;
1949 while (bwords-- > 0) {
1950 gsize bmap = *bitmap_data++;
1951 void **objptr = start_run;
1953 if ((bmap & 1) && *objptr) {
1954 add_profile_gc_root (report, *objptr, MONO_PROFILE_GC_ROOT_OTHER, 0);
1959 start_run += GC_BITS_PER_WORD;
1963 case ROOT_DESC_USER: {
1964 MonoGCRootMarkFunc marker = sgen_get_user_descriptor_func (desc);
1965 root_report = report;
1966 marker (start_root, single_arg_report_root, NULL);
1969 case ROOT_DESC_RUN_LEN:
1970 g_assert_not_reached ();
1972 g_assert_not_reached ();
1977 report_registered_roots_by_type (int root_type)
1979 GCRootReport report;
1983 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], start_root, root) {
1984 SGEN_LOG (6, "Precise root scan %p-%p (desc: %p)", start_root, root->end_root, (void*)root->root_desc);
1985 precisely_report_roots_from (&report, start_root, (void**)root->end_root, root->root_desc);
1986 } SGEN_HASH_TABLE_FOREACH_END;
1987 notify_gc_roots (&report);
1991 report_registered_roots (void)
1993 report_registered_roots_by_type (ROOT_TYPE_NORMAL);
1994 report_registered_roots_by_type (ROOT_TYPE_WBARRIER);
1998 sgen_client_collecting_minor (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2000 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2001 report_registered_roots ();
2002 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2003 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2006 static GCRootReport major_root_report;
2007 static gboolean profile_roots;
2010 sgen_client_collecting_major_1 (void)
2012 profile_roots = mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS;
2013 memset (&major_root_report, 0, sizeof (GCRootReport));
2017 sgen_client_pinned_los_object (char *obj)
2020 add_profile_gc_root (&major_root_report, obj, MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
2024 sgen_client_collecting_major_2 (void)
2027 notify_gc_roots (&major_root_report);
2029 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2030 report_registered_roots ();
2034 sgen_client_collecting_major_3 (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2036 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2037 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2040 #define MOVED_OBJECTS_NUM 64
2041 static void *moved_objects [MOVED_OBJECTS_NUM];
2042 static int moved_objects_idx = 0;
2045 mono_sgen_register_moved_object (void *obj, void *destination)
2047 g_assert (mono_profiler_events & MONO_PROFILE_GC_MOVES);
2049 if (moved_objects_idx == MOVED_OBJECTS_NUM) {
2050 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2051 moved_objects_idx = 0;
2053 moved_objects [moved_objects_idx++] = obj;
2054 moved_objects [moved_objects_idx++] = destination;
2058 mono_sgen_gc_event_moves (void)
2060 if (moved_objects_idx) {
2061 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2062 moved_objects_idx = 0;
2070 #define REFS_SIZE 128
2073 MonoGCReferences callback;
2077 MonoObject *refs [REFS_SIZE];
2078 uintptr_t offsets [REFS_SIZE];
2082 #define HANDLE_PTR(ptr,obj) do { \
2084 if (hwi->count == REFS_SIZE) { \
2085 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data); \
2089 hwi->offsets [hwi->count] = (char*)(ptr)-(char*)start; \
2090 hwi->refs [hwi->count++] = *(ptr); \
2095 collect_references (HeapWalkInfo *hwi, char *start, size_t size)
2097 mword desc = sgen_obj_get_descriptor (start);
2099 #include "sgen/sgen-scan-object.h"
2103 walk_references (char *start, size_t size, void *data)
2105 HeapWalkInfo *hwi = data;
2108 collect_references (hwi, start, size);
2109 if (hwi->count || !hwi->called)
2110 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data);
2114 * mono_gc_walk_heap:
2115 * @flags: flags for future use
2116 * @callback: a function pointer called for each object in the heap
2117 * @data: a user data pointer that is passed to callback
2119 * This function can be used to iterate over all the live objects in the heap:
2120 * for each object, @callback is invoked, providing info about the object's
2121 * location in memory, its class, its size and the objects it references.
2122 * For each referenced object it's offset from the object address is
2123 * reported in the offsets array.
2124 * The object references may be buffered, so the callback may be invoked
2125 * multiple times for the same object: in all but the first call, the size
2126 * argument will be zero.
2127 * Note that this function can be only called in the #MONO_GC_EVENT_PRE_START_WORLD
2128 * profiler event handler.
2130 * Returns: a non-zero value if the GC doesn't support heap walking
2133 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
2138 hwi.callback = callback;
2141 sgen_clear_nursery_fragments ();
2142 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data, walk_references, &hwi, FALSE);
2144 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, walk_references, &hwi);
2145 sgen_los_iterate_objects (walk_references, &hwi);
2155 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
2157 gc_callbacks = *callbacks;
2161 mono_gc_get_gc_callbacks ()
2163 return &gc_callbacks;
2167 sgen_client_thread_register (SgenThreadInfo* info, void *stack_bottom_fallback)
2170 guint8 *staddr = NULL;
2172 #ifndef HAVE_KW_THREAD
2173 g_assert (!mono_native_tls_get_value (thread_info_key));
2174 mono_native_tls_set_value (thread_info_key, info);
2176 sgen_thread_info = info;
2179 info->client_info.skip = 0;
2180 info->client_info.stopped_ip = NULL;
2181 info->client_info.stopped_domain = NULL;
2183 info->client_info.stack_start = NULL;
2185 #ifdef SGEN_POSIX_STW
2186 info->client_info.stop_count = -1;
2187 info->client_info.signal = 0;
2190 /* On win32, stack_start_limit should be 0, since the stack can grow dynamically */
2191 mono_thread_info_get_stack_bounds (&staddr, &stsize);
2194 info->client_info.stack_start_limit = staddr;
2196 info->client_info.stack_end = staddr + stsize;
2198 gsize stack_bottom = (gsize)stack_bottom_fallback;
2199 stack_bottom += 4095;
2200 stack_bottom &= ~4095;
2201 info->client_info.stack_end = (char*)stack_bottom;
2205 memset (&info->client_info.ctx, 0, sizeof (MonoContext));
2207 memset (&info->client_info.regs, 0, sizeof (info->client_info.regs));
2210 if (mono_gc_get_gc_callbacks ()->thread_attach_func)
2211 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2213 binary_protocol_thread_register ((gpointer)mono_thread_info_get_tid (info));
2215 SGEN_LOG (3, "registered thread %p (%p) stack end %p", info, (gpointer)mono_thread_info_get_tid (info), info->client_info.stack_end);
2219 sgen_client_thread_unregister (SgenThreadInfo *p)
2221 MonoNativeThreadId tid;
2223 #ifndef HAVE_KW_THREAD
2224 mono_native_tls_set_value (thread_info_key, NULL);
2226 sgen_thread_info = NULL;
2229 tid = mono_thread_info_get_tid (p);
2231 if (p->client_info.info.runtime_thread)
2232 mono_threads_add_joinable_thread ((gpointer)tid);
2234 if (mono_gc_get_gc_callbacks ()->thread_detach_func) {
2235 mono_gc_get_gc_callbacks ()->thread_detach_func (p->client_info.runtime_data);
2236 p->client_info.runtime_data = NULL;
2239 binary_protocol_thread_unregister ((gpointer)tid);
2240 SGEN_LOG (3, "unregister thread %p (%p)", p, (gpointer)tid);
2244 mono_gc_set_skip_thread (gboolean skip)
2246 SgenThreadInfo *info = mono_thread_info_current ();
2249 info->client_info.gc_disabled = skip;
2254 is_critical_method (MonoMethod *method)
2256 return mono_runtime_is_critical_method (method) || sgen_is_critical_method (method);
2260 thread_in_critical_region (SgenThreadInfo *info)
2262 return info->client_info.in_critical_region;
2266 sgen_thread_attach (SgenThreadInfo *info)
2268 if (mono_gc_get_gc_callbacks ()->thread_attach_func && !info->client_info.runtime_data)
2269 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2273 sgen_thread_detach (SgenThreadInfo *p)
2275 /* If a delegate is passed to native code and invoked on a thread we dont
2276 * know about, the jit will register it with mono_jit_thread_attach, but
2277 * we have no way of knowing when that thread goes away. SGen has a TSD
2278 * so we assume that if the domain is still registered, we can detach
2281 if (mono_domain_get ())
2282 mono_thread_detach_internal (mono_thread_internal_current ());
2286 mono_gc_register_thread (void *baseptr)
2288 return mono_thread_info_attach (baseptr) != NULL;
2292 mono_gc_is_gc_thread (void)
2296 result = mono_thread_info_current () != NULL;
2302 sgen_client_thread_register_worker (void)
2304 mono_thread_info_register_small_id ();
2307 /* Variables holding start/end nursery so it won't have to be passed at every call */
2308 static void *scan_area_arg_start, *scan_area_arg_end;
2311 mono_gc_conservatively_scan_area (void *start, void *end)
2313 sgen_conservatively_pin_objects_from (start, end, scan_area_arg_start, scan_area_arg_end, PIN_TYPE_STACK);
2317 mono_gc_scan_object (void *obj, void *gc_data)
2319 ScanCopyContext *ctx = gc_data;
2320 ctx->ops->copy_or_mark_object (&obj, ctx->queue);
2325 * Mark from thread stacks and registers.
2328 sgen_client_scan_thread_data (void *start_nursery, void *end_nursery, gboolean precise, ScanCopyContext ctx)
2330 SgenThreadInfo *info;
2332 scan_area_arg_start = start_nursery;
2333 scan_area_arg_end = end_nursery;
2335 FOREACH_THREAD (info) {
2336 int skip_reason = 0;
2337 if (info->client_info.skip) {
2338 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);
2340 } else if (info->client_info.gc_disabled) {
2341 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);
2343 } else if (!mono_thread_info_is_live (info)) {
2344 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);
2348 binary_protocol_scan_stack ((gpointer)mono_thread_info_get_tid (info), info->client_info.stack_start, info->client_info.stack_end, skip_reason);
2353 g_assert (info->client_info.suspend_done);
2354 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 ());
2355 if (mono_gc_get_gc_callbacks ()->thread_mark_func && !conservative_stack_mark) {
2356 mono_gc_get_gc_callbacks ()->thread_mark_func (info->client_info.runtime_data, info->client_info.stack_start, info->client_info.stack_end, precise, &ctx);
2357 } else if (!precise) {
2358 if (!conservative_stack_mark) {
2359 fprintf (stderr, "Precise stack mark not supported - disabling.\n");
2360 conservative_stack_mark = TRUE;
2362 sgen_conservatively_pin_objects_from (info->client_info.stack_start, info->client_info.stack_end, start_nursery, end_nursery, PIN_TYPE_STACK);
2367 sgen_conservatively_pin_objects_from ((void**)&info->client_info.ctx, (void**)&info->client_info.ctx + ARCH_NUM_REGS,
2368 start_nursery, end_nursery, PIN_TYPE_STACK);
2370 sgen_conservatively_pin_objects_from ((void**)&info->client_info.regs, (void**)&info->client_info.regs + ARCH_NUM_REGS,
2371 start_nursery, end_nursery, PIN_TYPE_STACK);
2374 } END_FOREACH_THREAD
2378 * mono_gc_set_stack_end:
2380 * Set the end of the current threads stack to STACK_END. The stack space between
2381 * STACK_END and the real end of the threads stack will not be scanned during collections.
2384 mono_gc_set_stack_end (void *stack_end)
2386 SgenThreadInfo *info;
2389 info = mono_thread_info_current ();
2391 SGEN_ASSERT (0, stack_end < info->client_info.stack_end, "Can only lower stack end");
2392 info->client_info.stack_end = stack_end;
2402 mono_gc_register_root (char *start, size_t size, void *descr)
2404 return sgen_register_root (start, size, descr, descr ? ROOT_TYPE_NORMAL : ROOT_TYPE_PINNED);
2408 mono_gc_register_root_wbarrier (char *start, size_t size, void *descr)
2410 return sgen_register_root (start, size, descr, ROOT_TYPE_WBARRIER);
2414 mono_gc_deregister_root (char* addr)
2416 sgen_deregister_root (addr);
2425 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
2427 return pthread_create (new_thread, attr, start_routine, arg);
2436 sgen_client_total_allocated_heap_changed (size_t allocated_heap)
2438 mono_runtime_resource_check_limit (MONO_RESOURCE_GC_HEAP, allocated_heap);
2442 mono_gc_user_markers_supported (void)
2448 mono_object_is_alive (MonoObject* o)
2454 mono_gc_get_generation (MonoObject *obj)
2456 if (sgen_ptr_in_nursery (obj))
2462 mono_gc_enable_events (void)
2467 mono_gc_get_gc_name (void)
2473 mono_gc_get_description (void)
2475 return g_strdup ("sgen");
2479 mono_gc_set_desktop_mode (void)
2484 mono_gc_is_moving (void)
2490 mono_gc_is_disabled (void)
2496 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
2503 mono_gc_max_generation (void)
2509 mono_gc_precise_stack_mark_enabled (void)
2511 return !conservative_stack_mark;
2515 mono_gc_collect (int generation)
2517 sgen_gc_collect (generation);
2521 mono_gc_collection_count (int generation)
2523 return sgen_gc_collection_count (generation);
2527 mono_gc_get_used_size (void)
2529 return (int64_t)sgen_gc_get_used_size ();
2533 mono_gc_get_heap_size (void)
2535 return (int64_t)sgen_gc_get_total_heap_allocation ();
2539 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
2541 return sgen_make_user_root_descriptor (marker);
2545 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
2547 return (void*)SGEN_DESC_STRING;
2551 mono_gc_get_nursery (int *shift_bits, size_t *size)
2553 *size = sgen_nursery_size;
2554 *shift_bits = DEFAULT_NURSERY_BITS;
2555 return sgen_get_nursery_start ();
2559 mono_gc_get_los_limit (void)
2561 return SGEN_MAX_SMALL_OBJ_SIZE;
2565 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
2567 sgen_register_disappearing_link (obj, link_addr, track, FALSE);
2571 mono_gc_weak_link_remove (void **link_addr, gboolean track)
2573 sgen_register_disappearing_link (NULL, link_addr, track, FALSE);
2577 mono_gc_weak_link_get (void **link_addr)
2579 return sgen_weak_link_get (link_addr);
2583 mono_gc_set_allow_synchronous_major (gboolean flag)
2585 return sgen_set_allow_synchronous_major (flag);
2589 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
2593 result = func (data);
2594 UNLOCK_INTERRUPTION;
2599 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
2605 sgen_client_out_of_memory (size_t size)
2607 mono_gc_out_of_memory (size);
2611 mono_gc_get_card_table (int *shift_bits, gpointer *mask)
2613 return sgen_get_card_table_configuration (shift_bits, mask);
2617 mono_gc_card_table_nursery_check (void)
2619 return !sgen_get_major_collector ()->is_concurrent;
2622 /* Negative value to remove */
2624 mono_gc_add_memory_pressure (gint64 value)
2626 /* FIXME: Implement at some point? */
2634 sgen_client_degraded_allocation (size_t size)
2636 static int last_major_gc_warned = -1;
2637 static int num_degraded = 0;
2639 if (last_major_gc_warned < gc_stats.major_gc_count) {
2641 if (num_degraded == 1 || num_degraded == 3)
2642 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Degraded allocation. Consider increasing nursery-size if the warning persists.");
2643 else if (num_degraded == 10)
2644 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Repeated degraded allocation. Consider increasing nursery-size.");
2645 last_major_gc_warned = gc_stats.major_gc_count;
2650 sgen_client_log_timing (GGTimingInfo *info, mword last_major_num_sections, mword last_los_memory_usage)
2652 SgenMajorCollector *major_collector = sgen_get_major_collector ();
2653 mword num_major_sections = major_collector->get_num_major_sections ();
2654 char full_timing_buff [1024];
2655 full_timing_buff [0] = '\0';
2657 if (!info->is_overflow)
2658 sprintf (full_timing_buff, "total %.2fms, bridge %.2fms", info->stw_time / 10000.0f, (int)info->bridge_time / 10000.0f);
2659 if (info->generation == GENERATION_OLD)
2660 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "GC_MAJOR%s: (%s) pause %.2fms, %s major %dK/%dK los %dK/%dK",
2661 info->is_overflow ? "_OVERFLOW" : "",
2662 info->reason ? info->reason : "",
2663 (int)info->total_time / 10000.0f,
2665 major_collector->section_size * num_major_sections / 1024,
2666 major_collector->section_size * last_major_num_sections / 1024,
2667 los_memory_usage / 1024,
2668 last_los_memory_usage / 1024);
2670 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "GC_MINOR%s: (%s) pause %.2fms, %s promoted %dK major %dK los %dK",
2671 info->is_overflow ? "_OVERFLOW" : "",
2672 info->reason ? info->reason : "",
2673 (int)info->total_time / 10000.0f,
2675 (num_major_sections - last_major_num_sections) * major_collector->section_size / 1024,
2676 major_collector->section_size * num_major_sections / 1024,
2677 los_memory_usage / 1024);
2685 sgen_client_description_for_internal_mem_type (int type)
2688 case INTERNAL_MEM_EPHEMERON_LINK: return "ephemeron-link";
2695 sgen_client_pre_collection_checks (void)
2697 if (sgen_mono_xdomain_checks) {
2698 sgen_clear_nursery_fragments ();
2699 sgen_check_for_xdomain_refs ();
2704 sgen_client_vtable_is_inited (GCVTable *gc_vtable)
2706 MonoVTable *vt = (MonoVTable*)gc_vtable;
2707 return vt->klass->inited;
2711 sgen_client_vtable_get_namespace (GCVTable *gc_vtable)
2713 MonoVTable *vt = (MonoVTable*)gc_vtable;
2714 return vt->klass->name_space;
2718 sgen_client_vtable_get_name (GCVTable *gc_vtable)
2720 MonoVTable *vt = (MonoVTable*)gc_vtable;
2721 return vt->klass->name;
2729 sgen_client_init (void)
2732 MonoThreadInfoCallbacks cb;
2734 cb.thread_register = sgen_thread_register;
2735 cb.thread_detach = sgen_thread_detach;
2736 cb.thread_unregister = sgen_thread_unregister;
2737 cb.thread_attach = sgen_thread_attach;
2738 cb.mono_method_is_critical = (gpointer)is_critical_method;
2739 cb.mono_thread_in_critical_region = thread_in_critical_region;
2741 mono_threads_init (&cb, sizeof (SgenThreadInfo));
2743 ///* Keep this the default for now */
2744 /* Precise marking is broken on all supported targets. Disable until fixed. */
2745 conservative_stack_mark = TRUE;
2747 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_EPHEMERON_LINK, sizeof (EphemeronLinkNode));
2749 mono_sgen_init_stw ();
2751 #ifndef HAVE_KW_THREAD
2752 mono_native_tls_alloc (&thread_info_key, NULL);
2753 #if defined(__APPLE__) || defined (HOST_WIN32)
2755 * CEE_MONO_TLS requires the tls offset, not the key, so the code below only works on darwin,
2756 * where the two are the same.
2758 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO, thread_info_key);
2762 int tls_offset = -1;
2763 MONO_THREAD_VAR_OFFSET (sgen_thread_info, tls_offset);
2764 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO, tls_offset);
2769 * This needs to happen before any internal allocations because
2770 * it inits the small id which is required for hazard pointer
2775 mono_gc_register_thread (&dummy);
2779 sgen_client_handle_gc_param (const char *opt)
2781 if (g_str_has_prefix (opt, "stack-mark=")) {
2782 opt = strchr (opt, '=') + 1;
2783 if (!strcmp (opt, "precise")) {
2784 conservative_stack_mark = FALSE;
2785 } else if (!strcmp (opt, "conservative")) {
2786 conservative_stack_mark = TRUE;
2788 sgen_env_var_error (MONO_GC_PARAMS_NAME, conservative_stack_mark ? "Using `conservative`." : "Using `precise`.",
2789 "Invalid value `%s` for `stack-mark` option, possible values are: `precise`, `conservative`.", opt);
2791 } else if (g_str_has_prefix (opt, "bridge-implementation=")) {
2792 opt = strchr (opt, '=') + 1;
2793 sgen_set_bridge_implementation (opt);
2794 } else if (g_str_has_prefix (opt, "toggleref-test")) {
2795 /* FIXME: This should probably in MONO_GC_DEBUG */
2796 sgen_register_test_toggleref_callback ();
2804 sgen_client_print_gc_params_usage (void)
2806 fprintf (stderr, " stack-mark=MARK-METHOD (where MARK-METHOD is 'precise' or 'conservative')\n");
2810 sgen_client_handle_gc_debug (const char *opt)
2812 if (!strcmp (opt, "xdomain-checks")) {
2813 sgen_mono_xdomain_checks = TRUE;
2814 } else if (!strcmp (opt, "do-not-finalize")) {
2815 do_not_finalize = TRUE;
2816 } else if (!strcmp (opt, "log-finalizers")) {
2817 log_finalizers = TRUE;
2818 } else if (!strcmp (opt, "no-managed-allocator")) {
2819 sgen_set_use_managed_allocator (FALSE);
2820 } else if (!sgen_bridge_handle_gc_debug (opt)) {
2827 sgen_client_print_gc_debug_usage (void)
2829 fprintf (stderr, " xdomain-checks\n");
2830 fprintf (stderr, " do-not-finalize\n");
2831 fprintf (stderr, " log-finalizers\n");
2832 fprintf (stderr, " no-managed-allocator\n");
2833 sgen_bridge_print_gc_debug_usage ();
2838 sgen_client_get_provenance (void)
2840 #ifdef SGEN_OBJECT_PROVENANCE
2841 MonoGCCallbacks *cb = mono_gc_get_gc_callbacks ();
2842 gpointer (*get_provenance_func) (void);
2845 get_provenance_func = cb->get_provenance_func;
2846 if (get_provenance_func)
2847 return get_provenance_func ();
2855 sgen_client_describe_invalid_pointer (GCObject *ptr)
2857 sgen_bridge_describe_pointer (ptr);
2861 mono_gc_base_init (void)
2863 mono_counters_init ();
2865 #ifdef HEAVY_STATISTICS
2866 mono_counters_register ("los marked cards", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_marked_cards);
2867 mono_counters_register ("los array cards scanned ", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_cards);
2868 mono_counters_register ("los array remsets", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_remsets);
2870 mono_counters_register ("WBarrier set arrayref", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_set_arrayref);
2871 mono_counters_register ("WBarrier value copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_value_copy);
2872 mono_counters_register ("WBarrier object copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_object_copy);
2877 if (nursery_canaries_enabled ())
2878 sgen_set_use_managed_allocator (FALSE);
2882 mono_gc_base_cleanup (void)
2887 mono_gc_is_null (void)