2 * sgen-mono.c: SGen features specific to Mono.
4 * Copyright (C) 2014 Xamarin Inc
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License 2.0 as published by the Free Software Foundation;
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
15 * You should have received a copy of the GNU Library General Public
16 * License 2.0 along with this library; if not, write to the Free
17 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include "sgen/sgen-gc.h"
24 #include "sgen/sgen-protocol.h"
25 #include "metadata/monitor.h"
26 #include "sgen/sgen-layout-stats.h"
27 #include "sgen/sgen-client.h"
28 #include "sgen/sgen-cardtable.h"
29 #include "sgen/sgen-pinning.h"
30 #include "metadata/marshal.h"
31 #include "metadata/method-builder.h"
32 #include "metadata/abi-details.h"
33 #include "metadata/mono-gc.h"
34 #include "metadata/runtime.h"
35 #include "metadata/sgen-bridge-internal.h"
36 #include "metadata/gc-internal.h"
37 #include "utils/mono-memory-model.h"
38 #include "utils/mono-logger-internal.h"
40 #ifdef HEAVY_STATISTICS
41 static guint64 stat_wbarrier_set_arrayref = 0;
42 static guint64 stat_wbarrier_value_copy = 0;
43 static guint64 stat_wbarrier_object_copy = 0;
45 static guint64 los_marked_cards;
46 static guint64 los_array_cards;
47 static guint64 los_array_remsets;
50 /* If set, mark stacks conservatively, even if precise marking is possible */
51 static gboolean conservative_stack_mark = FALSE;
52 /* If set, check that there are no references to the domain left at domain unload */
53 gboolean sgen_mono_xdomain_checks = FALSE;
55 /* Functions supplied by the runtime to be called by the GC */
56 static MonoGCCallbacks gc_callbacks;
59 __thread SgenThreadInfo *sgen_thread_info;
61 MonoNativeTlsKey thread_info_key;
64 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
66 #define OPDEF(a,b,c,d,e,f,g,h,i,j) \
70 #include "mono/cil/opcode.def"
81 ptr_on_stack (void *ptr)
83 gpointer stack_start = &stack_start;
84 SgenThreadInfo *info = mono_thread_info_current ();
86 if (ptr >= stack_start && ptr < (gpointer)info->client_info.stack_end)
91 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
93 #define HANDLE_PTR(ptr,obj) do { \
94 gpointer o = *(gpointer*)(ptr); \
96 gpointer d = ((char*)dest) + ((char*)(ptr) - (char*)(obj)); \
97 binary_protocol_wbarrier (d, o, (gpointer) SGEN_LOAD_VTABLE (o)); \
102 scan_object_for_binary_protocol_copy_wbarrier (gpointer dest, char *start, mword desc)
104 #define SCAN_OBJECT_NOVTABLE
105 #include "sgen/sgen-scan-object.h"
110 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
112 HEAVY_STAT (++stat_wbarrier_value_copy);
113 g_assert (klass->valuetype);
115 SGEN_LOG (8, "Adding value remset at %p, count %d, descr %p for class %s (%p)", dest, count, (gpointer)klass->gc_descr, klass->name, klass);
117 if (sgen_ptr_in_nursery (dest) || ptr_on_stack (dest) || !sgen_gc_descr_has_references ((mword)klass->gc_descr)) {
118 size_t element_size = mono_class_value_size (klass, NULL);
119 size_t size = count * element_size;
120 mono_gc_memmove_atomic (dest, src, size);
124 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
125 if (binary_protocol_is_heavy_enabled ()) {
126 size_t element_size = mono_class_value_size (klass, NULL);
128 for (i = 0; i < count; ++i) {
129 scan_object_for_binary_protocol_copy_wbarrier ((char*)dest + i * element_size,
130 (char*)src + i * element_size - sizeof (MonoObject),
131 (mword) klass->gc_descr);
136 sgen_get_remset ()->wbarrier_value_copy (dest, src, count, mono_class_value_size (klass, NULL));
140 * mono_gc_wbarrier_object_copy:
142 * Write barrier to call when obj is the result of a clone or copy of an object.
145 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
149 HEAVY_STAT (++stat_wbarrier_object_copy);
151 if (sgen_ptr_in_nursery (obj) || ptr_on_stack (obj) || !SGEN_OBJECT_HAS_REFERENCES (src)) {
152 size = mono_object_class (obj)->instance_size;
153 mono_gc_memmove_aligned ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
154 size - sizeof (MonoObject));
158 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
159 if (binary_protocol_is_heavy_enabled ())
160 scan_object_for_binary_protocol_copy_wbarrier (obj, (char*)src, (mword) src->vtable->gc_descr);
163 sgen_get_remset ()->wbarrier_object_copy (obj, src);
167 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
169 HEAVY_STAT (++stat_wbarrier_set_arrayref);
170 if (sgen_ptr_in_nursery (slot_ptr)) {
171 *(void**)slot_ptr = value;
174 SGEN_LOG (8, "Adding remset at %p", slot_ptr);
176 binary_protocol_wbarrier (slot_ptr, value, value->vtable);
178 sgen_get_remset ()->wbarrier_set_field ((GCObject*)arr, slot_ptr, value);
182 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
184 mono_gc_wbarrier_set_arrayref ((MonoArray*)obj, field_ptr, value);
188 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
190 sgen_wbarrier_value_copy_bitmap (_dest, _src, size, bitmap);
193 static MonoMethod *write_barrier_conc_method;
194 static MonoMethod *write_barrier_noconc_method;
197 sgen_is_critical_method (MonoMethod *method)
199 return (method == write_barrier_conc_method || method == write_barrier_noconc_method || sgen_is_managed_allocator (method));
203 sgen_has_critical_method (void)
205 return write_barrier_conc_method || write_barrier_noconc_method || sgen_has_managed_allocator ();
211 emit_nursery_check (MonoMethodBuilder *mb, int *nursery_check_return_labels, gboolean is_concurrent)
213 int shifted_nursery_start = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
215 memset (nursery_check_return_labels, 0, sizeof (int) * 2);
216 // if (ptr_in_nursery (ptr)) return;
218 * Masking out the bits might be faster, but we would have to use 64 bit
219 * immediates, which might be slower.
221 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
222 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_START);
223 mono_mb_emit_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 /* The generated barrier depends on this being the same at runtime */
336 info->d.wbarrier.nursery_bits = DEFAULT_NURSERY_BITS;
337 mono_marshal_set_wrapper_info (res, info);
341 if (*write_barrier_method_addr) {
342 /* Already created */
343 mono_free_method (res);
345 /* double-checked locking */
346 mono_memory_barrier ();
347 *write_barrier_method_addr = res;
351 return *write_barrier_method_addr;
355 mono_gc_get_write_barrier (void)
357 return mono_gc_get_specific_write_barrier (major_collector.is_concurrent);
361 * Dummy filler objects
364 /* Vtable of the objects used to fill out nursery fragments before a collection */
365 static GCVTable array_fill_vtable;
368 get_array_fill_vtable (void)
370 if (!array_fill_vtable) {
371 static MonoClass klass;
372 static char _vtable[sizeof(MonoVTable)+8];
373 MonoVTable* vtable = (MonoVTable*) ALIGN_TO((mword)_vtable, 8);
376 MonoDomain *domain = mono_get_root_domain ();
379 klass.element_class = mono_defaults.byte_class;
381 klass.instance_size = sizeof (MonoArray);
382 klass.sizes.element_size = 1;
383 klass.name = "array_filler_type";
385 vtable->klass = &klass;
387 vtable->gc_descr = mono_gc_make_descr_for_array (TRUE, &bmap, 0, 1);
390 array_fill_vtable = vtable;
392 return array_fill_vtable;
396 sgen_client_array_fill_range (char *start, size_t size)
400 if (size < sizeof (MonoArray)) {
401 memset (start, 0, size);
405 o = (MonoArray*)start;
406 o->obj.vtable = (MonoVTable*)get_array_fill_vtable ();
407 /* Mark this as not a real object */
408 o->obj.synchronisation = GINT_TO_POINTER (-1);
410 o->max_length = (mono_array_size_t)(size - sizeof (MonoArray));
416 sgen_client_zero_array_fill_header (void *p, size_t size)
418 if (size >= sizeof (MonoArray)) {
419 memset (p, 0, sizeof (MonoArray));
421 static guint8 zeros [sizeof (MonoArray)];
423 SGEN_ASSERT (0, !memcmp (p, zeros, size), "TLAB segment must be zeroed out.");
431 static MonoGCFinalizerCallbacks fin_callbacks;
434 mono_gc_get_vtable_bits (MonoClass *class)
437 /* FIXME move this to the bridge code */
438 if (sgen_need_bridge_processing ()) {
439 switch (sgen_bridge_class_kind (class)) {
440 case GC_BRIDGE_TRANSPARENT_BRIDGE_CLASS:
441 case GC_BRIDGE_OPAQUE_BRIDGE_CLASS:
442 res = SGEN_GC_BIT_BRIDGE_OBJECT;
444 case GC_BRIDGE_OPAQUE_CLASS:
445 res = SGEN_GC_BIT_BRIDGE_OPAQUE_OBJECT;
447 case GC_BRIDGE_TRANSPARENT_CLASS:
451 if (fin_callbacks.is_class_finalization_aware) {
452 if (fin_callbacks.is_class_finalization_aware (class))
453 res |= SGEN_GC_BIT_FINALIZER_AWARE;
459 is_finalization_aware (MonoObject *obj)
461 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
462 return (vt->gc_bits & SGEN_GC_BIT_FINALIZER_AWARE) == SGEN_GC_BIT_FINALIZER_AWARE;
466 sgen_client_object_queued_for_finalization (GCObject *obj)
468 if (fin_callbacks.object_queued_for_finalization && is_finalization_aware (obj))
469 fin_callbacks.object_queued_for_finalization (obj);
472 if (G_UNLIKELY (MONO_GC_FINALIZE_ENQUEUE_ENABLED ())) {
473 int gen = sgen_ptr_in_nursery (obj) ? GENERATION_NURSERY : GENERATION_OLD;
474 GCVTable vt = SGEN_LOAD_VTABLE (obj);
475 MONO_GC_FINALIZE_ENQUEUE ((mword)obj, sgen_safe_object_get_size (obj),
476 sgen_client_vtable_get_namespace (vt), sgen_client_vtable_get_name (vt), gen,
477 sgen_client_object_has_critical_finalizer (obj));
483 mono_gc_register_finalizer_callbacks (MonoGCFinalizerCallbacks *callbacks)
485 if (callbacks->version != MONO_GC_FINALIZER_EXTENSION_VERSION)
486 g_error ("Invalid finalizer callback version. Expected %d but got %d\n", MONO_GC_FINALIZER_EXTENSION_VERSION, callbacks->version);
488 fin_callbacks = *callbacks;
492 sgen_client_run_finalize (MonoObject *obj)
494 mono_gc_run_finalize (obj, NULL);
498 mono_gc_invoke_finalizers (void)
500 return sgen_gc_invoke_finalizers ();
504 mono_gc_pending_finalizers (void)
506 return sgen_have_pending_finalizers ();
510 sgen_client_finalize_notify (void)
512 mono_gc_finalize_notify ();
516 mono_gc_register_for_finalization (MonoObject *obj, void *user_data)
518 sgen_object_register_for_finalization (obj, user_data);
522 object_in_domain_predicate (MonoObject *obj, void *user_data)
524 MonoDomain *domain = user_data;
525 if (mono_object_domain (obj) == domain) {
526 SGEN_LOG (5, "Unregistering finalizer for object: %p (%s)", obj, sgen_client_vtable_get_name (SGEN_LOAD_VTABLE (obj)));
533 * mono_gc_finalizers_for_domain:
534 * @domain: the unloading appdomain
535 * @out_array: output array
536 * @out_size: size of output array
538 * Store inside @out_array up to @out_size objects that belong to the unloading
539 * appdomain @domain. Returns the number of stored items. Can be called repeteadly
540 * until it returns 0.
541 * The items are removed from the finalizer data structure, so the caller is supposed
543 * @out_array should be on the stack to allow the GC to know the objects are still alive.
546 mono_gc_finalizers_for_domain (MonoDomain *domain, MonoObject **out_array, int out_size)
548 return sgen_gather_finalizers_if (object_in_domain_predicate, domain, out_array, out_size);
555 typedef struct _EphemeronLinkNode EphemeronLinkNode;
557 struct _EphemeronLinkNode {
558 EphemeronLinkNode *next;
567 static EphemeronLinkNode *ephemeron_list;
569 /* LOCKING: requires that the GC lock is held */
571 null_ephemerons_for_domain (MonoDomain *domain)
573 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
576 MonoObject *object = (MonoObject*)current->array;
579 SGEN_ASSERT (0, object->vtable, "Can't have objects without vtables.");
581 if (object && object->vtable->domain == domain) {
582 EphemeronLinkNode *tmp = current;
585 prev->next = current->next;
587 ephemeron_list = current->next;
589 current = current->next;
590 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
593 current = current->next;
598 /* LOCKING: requires that the GC lock is held */
600 sgen_client_clear_unreachable_ephemerons (ScanCopyContext ctx)
602 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
603 SgenGrayQueue *queue = ctx.queue;
604 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
605 Ephemeron *cur, *array_end;
609 MonoArray *array = current->array;
611 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
612 EphemeronLinkNode *tmp = current;
614 SGEN_LOG (5, "Dead Ephemeron array at %p", array);
617 prev->next = current->next;
619 ephemeron_list = current->next;
621 current = current->next;
622 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
627 copy_func ((GCObject**)&array, queue);
628 current->array = array;
630 SGEN_LOG (5, "Clearing unreachable entries for ephemeron array at %p", array);
632 cur = mono_array_addr (array, Ephemeron, 0);
633 array_end = cur + mono_array_length_fast (array);
634 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
636 for (; cur < array_end; ++cur) {
637 GCObject *key = cur->key;
639 if (!key || key == tombstone)
642 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
643 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
644 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
646 if (!sgen_is_object_alive_for_current_gen (key)) {
647 cur->key = tombstone;
653 current = current->next;
658 LOCKING: requires that the GC lock is held
660 Limitations: We scan all ephemerons on every collection since the current design doesn't allow for a simple nursery/mature split.
663 sgen_client_mark_ephemerons (ScanCopyContext ctx)
665 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
666 SgenGrayQueue *queue = ctx.queue;
667 gboolean nothing_marked = TRUE;
668 EphemeronLinkNode *current = ephemeron_list;
669 Ephemeron *cur, *array_end;
672 for (current = ephemeron_list; current; current = current->next) {
673 MonoArray *array = current->array;
674 SGEN_LOG (5, "Ephemeron array at %p", array);
676 /*It has to be alive*/
677 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
678 SGEN_LOG (5, "\tnot reachable");
682 copy_func ((GCObject**)&array, queue);
684 cur = mono_array_addr (array, Ephemeron, 0);
685 array_end = cur + mono_array_length_fast (array);
686 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
688 for (; cur < array_end; ++cur) {
689 GCObject *key = cur->key;
691 if (!key || key == tombstone)
694 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
695 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
696 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
698 if (sgen_is_object_alive_for_current_gen (key)) {
699 GCObject *value = cur->value;
701 copy_func (&cur->key, queue);
703 if (!sgen_is_object_alive_for_current_gen (value))
704 nothing_marked = FALSE;
705 copy_func (&cur->value, queue);
711 SGEN_LOG (5, "Ephemeron run finished. Is it done %d", nothing_marked);
712 return nothing_marked;
716 mono_gc_ephemeron_array_add (MonoObject *obj)
718 EphemeronLinkNode *node;
722 node = sgen_alloc_internal (INTERNAL_MEM_EPHEMERON_LINK);
727 node->array = (MonoArray*)obj;
728 node->next = ephemeron_list;
729 ephemeron_list = node;
731 SGEN_LOG (5, "Registered ephemeron array %p", obj);
742 mono_gc_set_current_thread_appdomain (MonoDomain *domain)
744 SgenThreadInfo *info = mono_thread_info_current ();
746 /* Could be called from sgen_thread_unregister () with a NULL info */
749 info->client_info.stopped_domain = domain;
754 need_remove_object_for_domain (GCObject *start, MonoDomain *domain)
756 if (mono_object_domain (start) == domain) {
757 SGEN_LOG (4, "Need to cleanup object %p", start);
758 binary_protocol_cleanup (start, (gpointer)SGEN_LOAD_VTABLE (start), sgen_safe_object_get_size ((GCObject*)start));
765 process_object_for_domain_clearing (GCObject *start, MonoDomain *domain)
767 MonoVTable *vt = SGEN_LOAD_VTABLE (start);
768 if (vt->klass == mono_defaults.internal_thread_class)
769 g_assert (mono_object_domain (start) == mono_get_root_domain ());
770 /* The object could be a proxy for an object in the domain
772 #ifndef DISABLE_REMOTING
773 if (mono_defaults.real_proxy_class->supertypes && mono_class_has_parent_fast (vt->klass, mono_defaults.real_proxy_class)) {
774 MonoObject *server = ((MonoRealProxy*)start)->unwrapped_server;
776 /* The server could already have been zeroed out, so
777 we need to check for that, too. */
778 if (server && (!SGEN_LOAD_VTABLE (server) || mono_object_domain (server) == domain)) {
779 SGEN_LOG (4, "Cleaning up remote pointer in %p to object %p", start, server);
780 ((MonoRealProxy*)start)->unwrapped_server = NULL;
787 clear_domain_process_object (GCObject *obj, MonoDomain *domain)
791 process_object_for_domain_clearing (obj, domain);
792 remove = need_remove_object_for_domain (obj, domain);
794 if (remove && obj->synchronisation) {
795 guint32 dislink = mono_monitor_get_object_monitor_gchandle (obj);
797 mono_gchandle_free (dislink);
804 clear_domain_process_minor_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
806 if (clear_domain_process_object (obj, domain)) {
807 CANARIFY_SIZE (size);
808 memset (obj, 0, size);
813 clear_domain_process_major_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
815 clear_domain_process_object (obj, domain);
819 clear_domain_free_major_non_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
821 if (need_remove_object_for_domain (obj, domain))
822 major_collector.free_non_pinned_object (obj, size);
826 clear_domain_free_major_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
828 if (need_remove_object_for_domain (obj, domain))
829 major_collector.free_pinned_object (obj, size);
833 * When appdomains are unloaded we can easily remove objects that have finalizers,
834 * but all the others could still be present in random places on the heap.
835 * We need a sweep to get rid of them even though it's going to be costly
837 * The reason we need to remove them is because we access the vtable and class
838 * structures to know the object size and the reference bitmap: once the domain is
839 * unloaded the point to random memory.
842 mono_gc_clear_domain (MonoDomain * domain)
844 LOSObject *bigobj, *prev;
849 binary_protocol_domain_unload_begin (domain);
853 if (sgen_concurrent_collection_in_progress ())
854 sgen_perform_collection (0, GENERATION_OLD, "clear domain", TRUE);
855 SGEN_ASSERT (0, !sgen_concurrent_collection_in_progress (), "We just ordered a synchronous collection. Why are we collecting concurrently?");
857 major_collector.finish_sweeping ();
859 sgen_process_fin_stage_entries ();
861 sgen_clear_nursery_fragments ();
863 if (sgen_mono_xdomain_checks && domain != mono_get_root_domain ()) {
864 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_NORMAL);
865 sgen_scan_for_registered_roots_in_domain (domain, ROOT_TYPE_WBARRIER);
866 sgen_check_for_xdomain_refs ();
869 /*Ephemerons and dislinks must be processed before LOS since they might end up pointing
870 to memory returned to the OS.*/
871 null_ephemerons_for_domain (domain);
872 sgen_null_links_for_domain (domain);
874 for (i = GENERATION_NURSERY; i < GENERATION_MAX; ++i)
875 sgen_remove_finalizers_if (object_in_domain_predicate, domain, i);
877 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
878 (IterateObjectCallbackFunc)clear_domain_process_minor_object_callback, domain, FALSE, TRUE);
880 /* We need two passes over major and large objects because
881 freeing such objects might give their memory back to the OS
882 (in the case of large objects) or obliterate its vtable
883 (pinned objects with major-copying or pinned and non-pinned
884 objects with major-mark&sweep), but we might need to
885 dereference a pointer from an object to another object if
886 the first object is a proxy. */
887 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, (IterateObjectCallbackFunc)clear_domain_process_major_object_callback, domain);
888 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
889 clear_domain_process_object ((GCObject*)bigobj->data, domain);
892 for (bigobj = los_object_list; bigobj;) {
893 if (need_remove_object_for_domain ((GCObject*)bigobj->data, domain)) {
894 LOSObject *to_free = bigobj;
896 prev->next = bigobj->next;
898 los_object_list = bigobj->next;
899 bigobj = bigobj->next;
900 SGEN_LOG (4, "Freeing large object %p", bigobj->data);
901 sgen_los_free_object (to_free);
905 bigobj = bigobj->next;
907 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_NON_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_non_pinned_object_callback, domain);
908 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_pinned_object_callback, domain);
910 if (domain == mono_get_root_domain ()) {
911 sgen_pin_stats_print_class_stats ();
912 sgen_object_layout_dump (stdout);
915 sgen_restart_world (0, NULL);
917 binary_protocol_domain_unload_end (domain);
918 binary_protocol_flush_buffers (FALSE);
927 static gboolean alloc_events = FALSE;
930 mono_gc_enable_alloc_events (void)
936 mono_gc_alloc_obj (MonoVTable *vtable, size_t size)
938 MonoObject *obj = sgen_alloc_obj (vtable, size);
940 if (G_UNLIKELY (alloc_events))
941 mono_profiler_allocation (obj);
947 mono_gc_alloc_pinned_obj (MonoVTable *vtable, size_t size)
949 MonoObject *obj = sgen_alloc_obj_pinned (vtable, size);
951 if (G_UNLIKELY (alloc_events))
952 mono_profiler_allocation (obj);
958 mono_gc_alloc_mature (MonoVTable *vtable)
960 MonoObject *obj = sgen_alloc_obj_mature (vtable, vtable->klass->instance_size);
962 if (obj && G_UNLIKELY (obj->vtable->klass->has_finalize))
963 mono_object_register_finalizer (obj);
965 if (G_UNLIKELY (alloc_events))
966 mono_profiler_allocation (obj);
972 mono_gc_alloc_fixed (size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
974 /* FIXME: do a single allocation */
975 void *res = calloc (1, size);
978 if (!mono_gc_register_root (res, size, descr, source, msg)) {
986 mono_gc_free_fixed (void* addr)
988 mono_gc_deregister_root (addr);
996 static MonoMethod* alloc_method_cache [ATYPE_NUM];
997 static MonoMethod* slowpath_alloc_method_cache [ATYPE_NUM];
998 static gboolean use_managed_allocator = TRUE;
1000 #ifdef MANAGED_ALLOCATION
1002 #ifdef HAVE_KW_THREAD
1004 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { \
1005 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1006 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1007 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_TLAB_NEXT_ADDR); \
1010 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { \
1011 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1012 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1013 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_TLAB_TEMP_END); \
1018 #if defined(TARGET_OSX) || defined(TARGET_WIN32) || defined(TARGET_ANDROID) || defined(TARGET_IOS)
1019 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { \
1020 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1021 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1022 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1023 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_next_addr)); \
1024 mono_mb_emit_byte ((mb), CEE_ADD); \
1025 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1028 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { \
1029 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1030 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1031 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1032 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_temp_end)); \
1033 mono_mb_emit_byte ((mb), CEE_ADD); \
1034 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1038 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1039 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1044 /* FIXME: Do this in the JIT, where specialized allocation sequences can be created
1045 * for each class. This is currently not easy to do, as it is hard to generate basic
1046 * blocks + branches, but it is easy with the linear IL codebase.
1048 * For this to work we'd need to solve the TLAB race, first. Now we
1049 * require the allocator to be in a few known methods to make sure
1050 * that they are executed atomically via the restart mechanism.
1053 create_allocator (int atype, gboolean slowpath)
1055 int p_var, size_var;
1056 guint32 slowpath_branch, max_size_branch;
1057 MonoMethodBuilder *mb;
1059 MonoMethodSignature *csig;
1060 static gboolean registered = FALSE;
1061 int tlab_next_addr_var, new_next_var;
1062 const char *name = NULL;
1067 mono_register_jit_icall (mono_gc_alloc_obj, "mono_gc_alloc_obj", mono_create_icall_signature ("object ptr int"), FALSE);
1068 mono_register_jit_icall (mono_gc_alloc_vector, "mono_gc_alloc_vector", mono_create_icall_signature ("object ptr int int"), FALSE);
1069 mono_register_jit_icall (mono_gc_alloc_string, "mono_gc_alloc_string", mono_create_icall_signature ("object ptr int int32"), FALSE);
1073 if (atype == ATYPE_SMALL) {
1074 name = slowpath ? "SlowAllocSmall" : "AllocSmall";
1075 } else if (atype == ATYPE_NORMAL) {
1076 name = slowpath ? "SlowAlloc" : "Alloc";
1077 } else if (atype == ATYPE_VECTOR) {
1078 name = slowpath ? "SlowAllocVector" : "AllocVector";
1079 } else if (atype == ATYPE_STRING) {
1080 name = slowpath ? "SlowAllocString" : "AllocString";
1082 g_assert_not_reached ();
1085 if (atype == ATYPE_NORMAL)
1090 csig = mono_metadata_signature_alloc (mono_defaults.corlib, num_params);
1091 if (atype == ATYPE_STRING) {
1092 csig->ret = &mono_defaults.string_class->byval_arg;
1093 csig->params [0] = &mono_defaults.int_class->byval_arg;
1094 csig->params [1] = &mono_defaults.int32_class->byval_arg;
1096 csig->ret = &mono_defaults.object_class->byval_arg;
1097 for (i = 0; i < num_params; i++)
1098 csig->params [i] = &mono_defaults.int_class->byval_arg;
1101 mb = mono_mb_new (mono_defaults.object_class, name, MONO_WRAPPER_ALLOC);
1108 mono_mb_emit_ldarg (mb, 0);
1109 mono_mb_emit_icall (mb, mono_object_new_specific);
1112 mono_mb_emit_ldarg (mb, 0);
1113 mono_mb_emit_ldarg (mb, 1);
1114 mono_mb_emit_icall (mb, mono_array_new_specific);
1117 mono_mb_emit_ldarg (mb, 1);
1118 mono_mb_emit_icall (mb, mono_string_alloc);
1121 g_assert_not_reached ();
1127 size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1128 if (atype == ATYPE_SMALL) {
1129 /* size_var = size_arg */
1130 mono_mb_emit_ldarg (mb, 1);
1131 mono_mb_emit_stloc (mb, size_var);
1132 } else if (atype == ATYPE_NORMAL) {
1133 /* size = vtable->klass->instance_size; */
1134 mono_mb_emit_ldarg (mb, 0);
1135 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1136 mono_mb_emit_byte (mb, CEE_ADD);
1137 mono_mb_emit_byte (mb, CEE_LDIND_I);
1138 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, instance_size));
1139 mono_mb_emit_byte (mb, CEE_ADD);
1140 /* FIXME: assert instance_size stays a 4 byte integer */
1141 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1142 mono_mb_emit_byte (mb, CEE_CONV_I);
1143 mono_mb_emit_stloc (mb, size_var);
1144 } else if (atype == ATYPE_VECTOR) {
1145 MonoExceptionClause *clause;
1146 int pos, pos_leave, pos_error;
1147 MonoClass *oom_exc_class;
1151 * n > MONO_ARRAY_MAX_INDEX => OutOfMemoryException
1152 * n < 0 => OverflowException
1154 * We can do an unsigned comparison to catch both cases, then in the error
1155 * case compare signed to distinguish between them.
1157 mono_mb_emit_ldarg (mb, 1);
1158 mono_mb_emit_icon (mb, MONO_ARRAY_MAX_INDEX);
1159 mono_mb_emit_byte (mb, CEE_CONV_U);
1160 pos = mono_mb_emit_short_branch (mb, CEE_BLE_UN_S);
1162 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1163 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1164 mono_mb_emit_ldarg (mb, 1);
1165 mono_mb_emit_icon (mb, 0);
1166 pos_error = mono_mb_emit_short_branch (mb, CEE_BLT_S);
1167 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1168 mono_mb_patch_short_branch (mb, pos_error);
1169 mono_mb_emit_exception (mb, "OverflowException", NULL);
1171 mono_mb_patch_short_branch (mb, pos);
1173 clause = mono_image_alloc0 (mono_defaults.corlib, sizeof (MonoExceptionClause));
1174 clause->try_offset = mono_mb_get_label (mb);
1176 /* vtable->klass->sizes.element_size */
1177 mono_mb_emit_ldarg (mb, 0);
1178 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1179 mono_mb_emit_byte (mb, CEE_ADD);
1180 mono_mb_emit_byte (mb, CEE_LDIND_I);
1181 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, sizes));
1182 mono_mb_emit_byte (mb, CEE_ADD);
1183 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1184 mono_mb_emit_byte (mb, CEE_CONV_I);
1187 mono_mb_emit_ldarg (mb, 1);
1188 mono_mb_emit_byte (mb, CEE_MUL_OVF_UN);
1189 /* + sizeof (MonoArray) */
1190 mono_mb_emit_icon (mb, sizeof (MonoArray));
1191 mono_mb_emit_byte (mb, CEE_ADD_OVF_UN);
1192 mono_mb_emit_stloc (mb, size_var);
1194 pos_leave = mono_mb_emit_branch (mb, CEE_LEAVE);
1197 clause->flags = MONO_EXCEPTION_CLAUSE_NONE;
1198 clause->try_len = mono_mb_get_pos (mb) - clause->try_offset;
1199 clause->data.catch_class = mono_class_from_name (mono_defaults.corlib,
1200 "System", "OverflowException");
1201 g_assert (clause->data.catch_class);
1202 clause->handler_offset = mono_mb_get_label (mb);
1204 oom_exc_class = mono_class_from_name (mono_defaults.corlib,
1205 "System", "OutOfMemoryException");
1206 g_assert (oom_exc_class);
1207 ctor = mono_class_get_method_from_name (oom_exc_class, ".ctor", 0);
1210 mono_mb_emit_byte (mb, CEE_POP);
1211 mono_mb_emit_op (mb, CEE_NEWOBJ, ctor);
1212 mono_mb_emit_byte (mb, CEE_THROW);
1214 clause->handler_len = mono_mb_get_pos (mb) - clause->handler_offset;
1215 mono_mb_set_clauses (mb, 1, clause);
1216 mono_mb_patch_branch (mb, pos_leave);
1218 } else if (atype == ATYPE_STRING) {
1222 * a string allocator method takes the args: (vtable, len)
1224 * bytes = offsetof (MonoString, chars) + ((len + 1) * 2)
1228 * bytes <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1232 * offsetof (MonoString, chars) + ((len + 1) * 2) <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1233 * len <= (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - offsetof (MonoString, chars)) / 2 - 1
1235 mono_mb_emit_ldarg (mb, 1);
1236 mono_mb_emit_icon (mb, (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - MONO_STRUCT_OFFSET (MonoString, chars)) / 2 - 1);
1237 pos = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
1239 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1240 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1241 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1242 mono_mb_patch_short_branch (mb, pos);
1244 mono_mb_emit_ldarg (mb, 1);
1245 mono_mb_emit_icon (mb, 1);
1246 mono_mb_emit_byte (mb, MONO_CEE_SHL);
1247 //WE manually fold the above + 2 here
1248 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, chars) + 2);
1249 mono_mb_emit_byte (mb, CEE_ADD);
1250 mono_mb_emit_stloc (mb, size_var);
1252 g_assert_not_reached ();
1255 if (atype != ATYPE_SMALL) {
1256 /* size += ALLOC_ALIGN - 1; */
1257 mono_mb_emit_ldloc (mb, size_var);
1258 mono_mb_emit_icon (mb, SGEN_ALLOC_ALIGN - 1);
1259 mono_mb_emit_byte (mb, CEE_ADD);
1260 /* size &= ~(ALLOC_ALIGN - 1); */
1261 mono_mb_emit_icon (mb, ~(SGEN_ALLOC_ALIGN - 1));
1262 mono_mb_emit_byte (mb, CEE_AND);
1263 mono_mb_emit_stloc (mb, size_var);
1266 /* if (size > MAX_SMALL_OBJ_SIZE) goto slowpath */
1267 if (atype != ATYPE_SMALL) {
1268 mono_mb_emit_ldloc (mb, size_var);
1269 mono_mb_emit_icon (mb, SGEN_MAX_SMALL_OBJ_SIZE);
1270 max_size_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
1274 * We need to modify tlab_next, but the JIT only supports reading, so we read
1275 * another tls var holding its address instead.
1278 /* tlab_next_addr (local) = tlab_next_addr (TLS var) */
1279 tlab_next_addr_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1280 EMIT_TLS_ACCESS_NEXT_ADDR (mb);
1281 mono_mb_emit_stloc (mb, tlab_next_addr_var);
1283 /* p = (void**)tlab_next; */
1284 p_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1285 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1286 mono_mb_emit_byte (mb, CEE_LDIND_I);
1287 mono_mb_emit_stloc (mb, p_var);
1289 /* new_next = (char*)p + size; */
1290 new_next_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1291 mono_mb_emit_ldloc (mb, p_var);
1292 mono_mb_emit_ldloc (mb, size_var);
1293 mono_mb_emit_byte (mb, CEE_CONV_I);
1294 mono_mb_emit_byte (mb, CEE_ADD);
1295 mono_mb_emit_stloc (mb, new_next_var);
1297 /* if (G_LIKELY (new_next < tlab_temp_end)) */
1298 mono_mb_emit_ldloc (mb, new_next_var);
1299 EMIT_TLS_ACCESS_TEMP_END (mb);
1300 slowpath_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
1303 if (atype != ATYPE_SMALL)
1304 mono_mb_patch_short_branch (mb, max_size_branch);
1306 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1307 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1309 /* FIXME: mono_gc_alloc_obj takes a 'size_t' as an argument, not an int32 */
1310 mono_mb_emit_ldarg (mb, 0);
1311 mono_mb_emit_ldloc (mb, size_var);
1312 if (atype == ATYPE_NORMAL || atype == ATYPE_SMALL) {
1313 mono_mb_emit_icall (mb, mono_gc_alloc_obj);
1314 } else if (atype == ATYPE_VECTOR) {
1315 mono_mb_emit_ldarg (mb, 1);
1316 mono_mb_emit_icall (mb, mono_gc_alloc_vector);
1317 } else if (atype == ATYPE_STRING) {
1318 mono_mb_emit_ldarg (mb, 1);
1319 mono_mb_emit_icall (mb, mono_gc_alloc_string);
1321 g_assert_not_reached ();
1323 mono_mb_emit_byte (mb, CEE_RET);
1326 mono_mb_patch_short_branch (mb, slowpath_branch);
1328 /* FIXME: Memory barrier */
1330 /* tlab_next = new_next */
1331 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1332 mono_mb_emit_ldloc (mb, new_next_var);
1333 mono_mb_emit_byte (mb, CEE_STIND_I);
1335 /*The tlab store must be visible before the the vtable store. This could be replaced with a DDS but doing it with IL would be tricky. */
1336 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1337 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1338 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1341 mono_mb_emit_ldloc (mb, p_var);
1342 mono_mb_emit_ldarg (mb, 0);
1343 mono_mb_emit_byte (mb, CEE_STIND_I);
1345 if (atype == ATYPE_VECTOR) {
1346 /* arr->max_length = max_length; */
1347 mono_mb_emit_ldloc (mb, p_var);
1348 mono_mb_emit_ldflda (mb, MONO_STRUCT_OFFSET (MonoArray, max_length));
1349 mono_mb_emit_ldarg (mb, 1);
1350 #ifdef MONO_BIG_ARRAYS
1351 mono_mb_emit_byte (mb, CEE_STIND_I);
1353 mono_mb_emit_byte (mb, CEE_STIND_I4);
1355 } else if (atype == ATYPE_STRING) {
1356 /* need to set length and clear the last char */
1357 /* s->length = len; */
1358 mono_mb_emit_ldloc (mb, p_var);
1359 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, length));
1360 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1361 mono_mb_emit_ldarg (mb, 1);
1362 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
1363 /* s->chars [len] = 0; */
1364 mono_mb_emit_ldloc (mb, p_var);
1365 mono_mb_emit_ldloc (mb, size_var);
1366 mono_mb_emit_icon (mb, 2);
1367 mono_mb_emit_byte (mb, MONO_CEE_SUB);
1368 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1369 mono_mb_emit_icon (mb, 0);
1370 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
1374 We must make sure both vtable and max_length are globaly visible before returning to managed land.
1376 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1377 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1378 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1381 mono_mb_emit_ldloc (mb, p_var);
1384 mono_mb_emit_byte (mb, CEE_RET);
1387 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
1388 info->d.alloc.gc_name = "sgen";
1389 info->d.alloc.alloc_type = atype;
1391 res = mono_mb_create (mb, csig, 8, info);
1394 mono_method_get_header (res)->init_locals = FALSE;
1403 mono_gc_get_aligned_size_for_allocator (int size)
1405 int aligned_size = size;
1406 aligned_size += SGEN_ALLOC_ALIGN - 1;
1407 aligned_size &= ~(SGEN_ALLOC_ALIGN - 1);
1408 return aligned_size;
1412 * Generate an allocator method implementing the fast path of mono_gc_alloc_obj ().
1413 * The signature of the called method is:
1414 * object allocate (MonoVTable *vtable)
1417 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box, gboolean known_instance_size)
1419 #ifdef MANAGED_ALLOCATION
1420 if (collect_before_allocs)
1422 if (!mono_runtime_has_tls_get ())
1424 if (klass->instance_size > tlab_size)
1426 if (known_instance_size && ALIGN_TO (klass->instance_size, SGEN_ALLOC_ALIGN) >= SGEN_MAX_SMALL_OBJ_SIZE)
1428 if (mono_class_has_finalizer (klass) || mono_class_is_marshalbyref (klass) || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
1432 if (klass->byval_arg.type == MONO_TYPE_STRING)
1433 return mono_gc_get_managed_allocator_by_type (ATYPE_STRING, FALSE);
1434 /* Generic classes have dynamic field and can go above MAX_SMALL_OBJ_SIZE. */
1435 if (known_instance_size)
1436 return mono_gc_get_managed_allocator_by_type (ATYPE_SMALL, FALSE);
1438 return mono_gc_get_managed_allocator_by_type (ATYPE_NORMAL, FALSE);
1445 mono_gc_get_managed_array_allocator (MonoClass *klass)
1447 #ifdef MANAGED_ALLOCATION
1448 if (klass->rank != 1)
1450 if (!mono_runtime_has_tls_get ())
1452 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1454 if (has_per_allocation_action)
1456 g_assert (!mono_class_has_finalizer (klass) && !mono_class_is_marshalbyref (klass));
1458 return mono_gc_get_managed_allocator_by_type (ATYPE_VECTOR, FALSE);
1465 sgen_set_use_managed_allocator (gboolean flag)
1467 use_managed_allocator = flag;
1471 mono_gc_get_managed_allocator_by_type (int atype, gboolean slowpath)
1473 #ifdef MANAGED_ALLOCATION
1475 MonoMethod **cache = slowpath ? slowpath_alloc_method_cache : alloc_method_cache;
1477 if (!use_managed_allocator)
1480 if (!mono_runtime_has_tls_get ())
1483 res = cache [atype];
1487 res = create_allocator (atype, slowpath);
1489 if (cache [atype]) {
1490 mono_free_method (res);
1491 res = cache [atype];
1493 mono_memory_barrier ();
1494 cache [atype] = res;
1505 mono_gc_get_managed_allocator_types (void)
1511 sgen_is_managed_allocator (MonoMethod *method)
1515 for (i = 0; i < ATYPE_NUM; ++i)
1516 if (method == alloc_method_cache [i] || method == slowpath_alloc_method_cache [i])
1522 sgen_has_managed_allocator (void)
1526 for (i = 0; i < ATYPE_NUM; ++i)
1527 if (alloc_method_cache [i] || slowpath_alloc_method_cache [i])
1533 * Cardtable scanning
1536 #define MWORD_MASK (sizeof (mword) - 1)
1539 find_card_offset (mword card)
1541 /*XXX Use assembly as this generates some pretty bad code */
1542 #if defined(__i386__) && defined(__GNUC__)
1543 return (__builtin_ffs (card) - 1) / 8;
1544 #elif defined(__x86_64__) && defined(__GNUC__)
1545 return (__builtin_ffsll (card) - 1) / 8;
1546 #elif defined(__s390x__)
1547 return (__builtin_ffsll (GUINT64_TO_LE(card)) - 1) / 8;
1550 guint8 *ptr = (guint8 *) &card;
1551 for (i = 0; i < sizeof (mword); ++i) {
1560 find_next_card (guint8 *card_data, guint8 *end)
1562 mword *cards, *cards_end;
1565 while ((((mword)card_data) & MWORD_MASK) && card_data < end) {
1571 if (card_data == end)
1574 cards = (mword*)card_data;
1575 cards_end = (mword*)((mword)end & ~MWORD_MASK);
1576 while (cards < cards_end) {
1579 return (guint8*)cards + find_card_offset (card);
1583 card_data = (guint8*)cards_end;
1584 while (card_data < end) {
1593 #define ARRAY_OBJ_INDEX(ptr,array,elem_size) (((char*)(ptr) - ((char*)(array) + G_STRUCT_OFFSET (MonoArray, vector))) / (elem_size))
1596 sgen_client_cardtable_scan_object (GCObject *obj, mword block_obj_size, guint8 *cards, gboolean mod_union, ScanCopyContext ctx)
1598 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
1599 MonoClass *klass = vt->klass;
1601 SGEN_ASSERT (0, SGEN_VTABLE_HAS_REFERENCES (vt), "Why would we ever call this on reference-free objects?");
1604 MonoArray *arr = (MonoArray*)obj;
1605 guint8 *card_data, *card_base;
1606 guint8 *card_data_end;
1607 char *obj_start = sgen_card_table_align_pointer (obj);
1609 mword obj_size = sgen_mono_array_size (vt, arr, &bounds_size, sgen_vtable_get_descriptor (vt));
1610 /* We don't want to scan the bounds entries at the end of multidimensional arrays */
1611 char *obj_end = (char*)obj + obj_size - bounds_size;
1613 size_t extra_idx = 0;
1615 mword desc = (mword)klass->element_class->gc_descr;
1616 int elem_size = mono_array_element_size (klass);
1618 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1619 guint8 *overflow_scan_end = NULL;
1622 #ifdef SGEN_OBJECT_LAYOUT_STATISTICS
1623 if (klass->element_class->valuetype)
1624 sgen_object_layout_scanned_vtype_array ();
1626 sgen_object_layout_scanned_ref_array ();
1632 card_data = sgen_card_table_get_card_scan_address ((mword)obj);
1634 card_base = card_data;
1635 card_count = sgen_card_table_number_of_cards_in_range ((mword)obj, obj_size);
1636 card_data_end = card_data + card_count;
1639 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1640 /*Check for overflow and if so, setup to scan in two steps*/
1641 if (!cards && card_data_end >= SGEN_SHADOW_CARDTABLE_END) {
1642 overflow_scan_end = sgen_shadow_cardtable + (card_data_end - SGEN_SHADOW_CARDTABLE_END);
1643 card_data_end = SGEN_SHADOW_CARDTABLE_END;
1649 card_data = find_next_card (card_data, card_data_end);
1650 for (; card_data < card_data_end; card_data = find_next_card (card_data + 1, card_data_end)) {
1652 size_t idx = (card_data - card_base) + extra_idx;
1653 char *start = (char*)(obj_start + idx * CARD_SIZE_IN_BYTES);
1654 char *card_end = start + CARD_SIZE_IN_BYTES;
1655 char *first_elem, *elem;
1657 HEAVY_STAT (++los_marked_cards);
1660 sgen_card_table_prepare_card_for_scanning (card_data);
1662 card_end = MIN (card_end, obj_end);
1664 if (start <= (char*)arr->vector)
1667 index = ARRAY_OBJ_INDEX (start, obj, elem_size);
1669 elem = first_elem = (char*)mono_array_addr_with_size_fast ((MonoArray*)obj, elem_size, index);
1670 if (klass->element_class->valuetype) {
1671 ScanVTypeFunc scan_vtype_func = ctx.ops->scan_vtype;
1673 for (; elem < card_end; elem += elem_size)
1674 scan_vtype_func (obj, elem, desc, ctx.queue BINARY_PROTOCOL_ARG (elem_size));
1676 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
1678 HEAVY_STAT (++los_array_cards);
1679 for (; elem < card_end; elem += SIZEOF_VOID_P) {
1680 gpointer new, old = *(gpointer*)elem;
1681 if ((mod_union && old) || G_UNLIKELY (sgen_ptr_in_nursery (old))) {
1682 HEAVY_STAT (++los_array_remsets);
1683 copy_func ((GCObject**)elem, ctx.queue);
1684 new = *(gpointer*)elem;
1685 if (G_UNLIKELY (sgen_ptr_in_nursery (new)))
1686 sgen_add_to_global_remset (elem, new);
1691 binary_protocol_card_scan (first_elem, elem - first_elem);
1694 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1695 if (overflow_scan_end) {
1696 extra_idx = card_data - card_base;
1697 card_base = card_data = sgen_shadow_cardtable;
1698 card_data_end = overflow_scan_end;
1699 overflow_scan_end = NULL;
1710 * Array and string allocation
1714 mono_gc_alloc_vector (MonoVTable *vtable, size_t size, uintptr_t max_length)
1719 if (!SGEN_CAN_ALIGN_UP (size))
1722 #ifndef DISABLE_CRITICAL_REGION
1723 ENTER_CRITICAL_REGION;
1724 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1726 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1727 arr->max_length = (mono_array_size_t)max_length;
1728 EXIT_CRITICAL_REGION;
1731 EXIT_CRITICAL_REGION;
1736 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1737 if (G_UNLIKELY (!arr)) {
1739 return mono_gc_out_of_memory (size);
1742 arr->max_length = (mono_array_size_t)max_length;
1747 if (G_UNLIKELY (alloc_events))
1748 mono_profiler_allocation (&arr->obj);
1750 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Vector has incorrect size.");
1755 mono_gc_alloc_array (MonoVTable *vtable, size_t size, uintptr_t max_length, uintptr_t bounds_size)
1758 MonoArrayBounds *bounds;
1761 if (!SGEN_CAN_ALIGN_UP (size))
1764 #ifndef DISABLE_CRITICAL_REGION
1765 ENTER_CRITICAL_REGION;
1766 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1768 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1769 arr->max_length = (mono_array_size_t)max_length;
1771 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1772 arr->bounds = bounds;
1773 EXIT_CRITICAL_REGION;
1776 EXIT_CRITICAL_REGION;
1781 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1782 if (G_UNLIKELY (!arr)) {
1784 return mono_gc_out_of_memory (size);
1787 arr->max_length = (mono_array_size_t)max_length;
1789 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1790 arr->bounds = bounds;
1795 if (G_UNLIKELY (alloc_events))
1796 mono_profiler_allocation (&arr->obj);
1798 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Array has incorrect size.");
1803 mono_gc_alloc_string (MonoVTable *vtable, size_t size, gint32 len)
1808 if (!SGEN_CAN_ALIGN_UP (size))
1811 #ifndef DISABLE_CRITICAL_REGION
1812 ENTER_CRITICAL_REGION;
1813 str = (MonoString*)sgen_try_alloc_obj_nolock (vtable, size);
1815 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1817 EXIT_CRITICAL_REGION;
1820 EXIT_CRITICAL_REGION;
1825 str = (MonoString*)sgen_alloc_obj_nolock (vtable, size);
1826 if (G_UNLIKELY (!str)) {
1828 return mono_gc_out_of_memory (size);
1836 if (G_UNLIKELY (alloc_events))
1837 mono_profiler_allocation (&str->object);
1847 mono_gc_set_string_length (MonoString *str, gint32 new_length)
1849 mono_unichar2 *new_end = str->chars + new_length;
1851 /* zero the discarded string. This null-delimits the string and allows
1852 * the space to be reclaimed by SGen. */
1854 if (nursery_canaries_enabled () && sgen_ptr_in_nursery (str)) {
1855 CHECK_CANARY_FOR_OBJECT ((GCObject*)str, TRUE);
1856 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2) + CANARY_SIZE);
1857 memcpy (new_end + 1 , CANARY_STRING, CANARY_SIZE);
1859 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2));
1862 str->length = new_length;
1869 #define GC_ROOT_NUM 32
1871 int count; /* must be the first field */
1872 void *objects [GC_ROOT_NUM];
1873 int root_types [GC_ROOT_NUM];
1874 uintptr_t extra_info [GC_ROOT_NUM];
1878 notify_gc_roots (GCRootReport *report)
1882 mono_profiler_gc_roots (report->count, report->objects, report->root_types, report->extra_info);
1887 add_profile_gc_root (GCRootReport *report, void *object, int rtype, uintptr_t extra_info)
1889 if (report->count == GC_ROOT_NUM)
1890 notify_gc_roots (report);
1891 report->objects [report->count] = object;
1892 report->root_types [report->count] = rtype;
1893 report->extra_info [report->count++] = (uintptr_t)SGEN_LOAD_VTABLE (object)->klass;
1897 sgen_client_nursery_objects_pinned (void **definitely_pinned, int count)
1899 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS) {
1900 GCRootReport report;
1903 for (idx = 0; idx < count; ++idx)
1904 add_profile_gc_root (&report, definitely_pinned [idx], MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
1905 notify_gc_roots (&report);
1910 report_finalizer_roots_from_queue (SgenPointerQueue *queue)
1912 GCRootReport report;
1916 for (i = 0; i < queue->next_slot; ++i) {
1917 void *obj = queue->data [i];
1920 add_profile_gc_root (&report, obj, MONO_PROFILE_GC_ROOT_FINALIZER, 0);
1922 notify_gc_roots (&report);
1926 report_finalizer_roots (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
1928 report_finalizer_roots_from_queue (fin_ready_queue);
1929 report_finalizer_roots_from_queue (critical_fin_queue);
1932 static GCRootReport *root_report;
1935 single_arg_report_root (MonoObject **obj, void *gc_data)
1938 add_profile_gc_root (root_report, *obj, MONO_PROFILE_GC_ROOT_OTHER, 0);
1942 precisely_report_roots_from (GCRootReport *report, void** start_root, void** end_root, mword desc)
1944 switch (desc & ROOT_DESC_TYPE_MASK) {
1945 case ROOT_DESC_BITMAP:
1946 desc >>= ROOT_DESC_TYPE_SHIFT;
1948 if ((desc & 1) && *start_root) {
1949 add_profile_gc_root (report, *start_root, MONO_PROFILE_GC_ROOT_OTHER, 0);
1955 case ROOT_DESC_COMPLEX: {
1956 gsize *bitmap_data = sgen_get_complex_descriptor_bitmap (desc);
1957 gsize bwords = (*bitmap_data) - 1;
1958 void **start_run = start_root;
1960 while (bwords-- > 0) {
1961 gsize bmap = *bitmap_data++;
1962 void **objptr = start_run;
1964 if ((bmap & 1) && *objptr) {
1965 add_profile_gc_root (report, *objptr, MONO_PROFILE_GC_ROOT_OTHER, 0);
1970 start_run += GC_BITS_PER_WORD;
1974 case ROOT_DESC_USER: {
1975 MonoGCRootMarkFunc marker = (MonoGCRootMarkFunc)sgen_get_user_descriptor_func (desc);
1976 root_report = report;
1977 marker ((MonoObject**)start_root, single_arg_report_root, NULL);
1980 case ROOT_DESC_RUN_LEN:
1981 g_assert_not_reached ();
1983 g_assert_not_reached ();
1988 report_registered_roots_by_type (int root_type)
1990 GCRootReport report;
1994 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], start_root, root) {
1995 SGEN_LOG (6, "Precise root scan %p-%p (desc: %p)", start_root, root->end_root, (void*)root->root_desc);
1996 precisely_report_roots_from (&report, start_root, (void**)root->end_root, root->root_desc);
1997 } SGEN_HASH_TABLE_FOREACH_END;
1998 notify_gc_roots (&report);
2002 report_registered_roots (void)
2004 report_registered_roots_by_type (ROOT_TYPE_NORMAL);
2005 report_registered_roots_by_type (ROOT_TYPE_WBARRIER);
2009 sgen_client_collecting_minor (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2011 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2012 report_registered_roots ();
2013 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2014 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2017 static GCRootReport major_root_report;
2018 static gboolean profile_roots;
2021 sgen_client_collecting_major_1 (void)
2023 profile_roots = mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS;
2024 memset (&major_root_report, 0, sizeof (GCRootReport));
2028 sgen_client_pinned_los_object (GCObject *obj)
2031 add_profile_gc_root (&major_root_report, (char*)obj, MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
2035 sgen_client_collecting_major_2 (void)
2038 notify_gc_roots (&major_root_report);
2040 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2041 report_registered_roots ();
2045 sgen_client_collecting_major_3 (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2047 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2048 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2051 #define MOVED_OBJECTS_NUM 64
2052 static void *moved_objects [MOVED_OBJECTS_NUM];
2053 static int moved_objects_idx = 0;
2056 mono_sgen_register_moved_object (void *obj, void *destination)
2058 g_assert (mono_profiler_events & MONO_PROFILE_GC_MOVES);
2060 if (moved_objects_idx == MOVED_OBJECTS_NUM) {
2061 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2062 moved_objects_idx = 0;
2064 moved_objects [moved_objects_idx++] = obj;
2065 moved_objects [moved_objects_idx++] = destination;
2069 mono_sgen_gc_event_moves (void)
2071 if (moved_objects_idx) {
2072 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2073 moved_objects_idx = 0;
2081 #define REFS_SIZE 128
2084 MonoGCReferences callback;
2088 MonoObject *refs [REFS_SIZE];
2089 uintptr_t offsets [REFS_SIZE];
2093 #define HANDLE_PTR(ptr,obj) do { \
2095 if (hwi->count == REFS_SIZE) { \
2096 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data); \
2100 hwi->offsets [hwi->count] = (char*)(ptr)-(char*)start; \
2101 hwi->refs [hwi->count++] = *(ptr); \
2106 collect_references (HeapWalkInfo *hwi, GCObject *obj, size_t size)
2108 char *start = (char*)obj;
2109 mword desc = sgen_obj_get_descriptor (obj);
2111 #include "sgen/sgen-scan-object.h"
2115 walk_references (GCObject *start, size_t size, void *data)
2117 HeapWalkInfo *hwi = data;
2120 collect_references (hwi, start, size);
2121 if (hwi->count || !hwi->called)
2122 hwi->callback (start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data);
2126 * mono_gc_walk_heap:
2127 * @flags: flags for future use
2128 * @callback: a function pointer called for each object in the heap
2129 * @data: a user data pointer that is passed to callback
2131 * This function can be used to iterate over all the live objects in the heap:
2132 * for each object, @callback is invoked, providing info about the object's
2133 * location in memory, its class, its size and the objects it references.
2134 * For each referenced object it's offset from the object address is
2135 * reported in the offsets array.
2136 * The object references may be buffered, so the callback may be invoked
2137 * multiple times for the same object: in all but the first call, the size
2138 * argument will be zero.
2139 * Note that this function can be only called in the #MONO_GC_EVENT_PRE_START_WORLD
2140 * profiler event handler.
2142 * Returns: a non-zero value if the GC doesn't support heap walking
2145 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
2150 hwi.callback = callback;
2153 sgen_clear_nursery_fragments ();
2154 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data, walk_references, &hwi, FALSE, TRUE);
2156 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, walk_references, &hwi);
2157 sgen_los_iterate_objects (walk_references, &hwi);
2167 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
2169 gc_callbacks = *callbacks;
2173 mono_gc_get_gc_callbacks ()
2175 return &gc_callbacks;
2179 sgen_client_thread_register (SgenThreadInfo* info, void *stack_bottom_fallback)
2182 guint8 *staddr = NULL;
2184 #ifndef HAVE_KW_THREAD
2185 g_assert (!mono_native_tls_get_value (thread_info_key));
2186 mono_native_tls_set_value (thread_info_key, info);
2188 sgen_thread_info = info;
2191 info->client_info.skip = 0;
2192 info->client_info.stopped_ip = NULL;
2193 info->client_info.stopped_domain = NULL;
2195 info->client_info.stack_start = NULL;
2197 #ifdef SGEN_POSIX_STW
2198 info->client_info.stop_count = -1;
2199 info->client_info.signal = 0;
2202 /* On win32, stack_start_limit should be 0, since the stack can grow dynamically */
2203 mono_thread_info_get_stack_bounds (&staddr, &stsize);
2206 info->client_info.stack_start_limit = staddr;
2208 info->client_info.stack_end = staddr + stsize;
2210 gsize stack_bottom = (gsize)stack_bottom_fallback;
2211 stack_bottom += 4095;
2212 stack_bottom &= ~4095;
2213 info->client_info.stack_end = (char*)stack_bottom;
2217 memset (&info->client_info.ctx, 0, sizeof (MonoContext));
2219 memset (&info->client_info.regs, 0, sizeof (info->client_info.regs));
2222 if (mono_gc_get_gc_callbacks ()->thread_attach_func)
2223 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2225 binary_protocol_thread_register ((gpointer)mono_thread_info_get_tid (info));
2227 SGEN_LOG (3, "registered thread %p (%p) stack end %p", info, (gpointer)mono_thread_info_get_tid (info), info->client_info.stack_end);
2231 sgen_client_thread_unregister (SgenThreadInfo *p)
2233 MonoNativeThreadId tid;
2235 #ifndef HAVE_KW_THREAD
2236 mono_native_tls_set_value (thread_info_key, NULL);
2238 sgen_thread_info = NULL;
2241 tid = mono_thread_info_get_tid (p);
2243 if (p->client_info.info.runtime_thread)
2244 mono_threads_add_joinable_thread ((gpointer)tid);
2246 if (mono_gc_get_gc_callbacks ()->thread_detach_func) {
2247 mono_gc_get_gc_callbacks ()->thread_detach_func (p->client_info.runtime_data);
2248 p->client_info.runtime_data = NULL;
2251 binary_protocol_thread_unregister ((gpointer)tid);
2252 SGEN_LOG (3, "unregister thread %p (%p)", p, (gpointer)tid);
2256 mono_gc_set_skip_thread (gboolean skip)
2258 SgenThreadInfo *info = mono_thread_info_current ();
2261 info->client_info.gc_disabled = skip;
2266 is_critical_method (MonoMethod *method)
2268 return mono_runtime_is_critical_method (method) || sgen_is_critical_method (method);
2272 thread_in_critical_region (SgenThreadInfo *info)
2274 return info->client_info.in_critical_region;
2278 sgen_thread_attach (SgenThreadInfo *info)
2280 if (mono_gc_get_gc_callbacks ()->thread_attach_func && !info->client_info.runtime_data)
2281 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2285 sgen_thread_detach (SgenThreadInfo *p)
2287 /* If a delegate is passed to native code and invoked on a thread we dont
2288 * know about, the jit will register it with mono_jit_thread_attach, but
2289 * we have no way of knowing when that thread goes away. SGen has a TSD
2290 * so we assume that if the domain is still registered, we can detach
2293 if (mono_domain_get ())
2294 mono_thread_detach_internal (mono_thread_internal_current ());
2298 mono_gc_register_thread (void *baseptr)
2300 return mono_thread_info_attach (baseptr) != NULL;
2304 mono_gc_is_gc_thread (void)
2308 result = mono_thread_info_current () != NULL;
2314 sgen_client_thread_register_worker (void)
2316 mono_thread_info_register_small_id ();
2319 /* Variables holding start/end nursery so it won't have to be passed at every call */
2320 static void *scan_area_arg_start, *scan_area_arg_end;
2323 mono_gc_conservatively_scan_area (void *start, void *end)
2325 sgen_conservatively_pin_objects_from (start, end, scan_area_arg_start, scan_area_arg_end, PIN_TYPE_STACK);
2329 mono_gc_scan_object (void *obj, void *gc_data)
2331 ScanCopyContext *ctx = gc_data;
2332 ctx->ops->copy_or_mark_object ((GCObject**)&obj, ctx->queue);
2337 * Mark from thread stacks and registers.
2340 sgen_client_scan_thread_data (void *start_nursery, void *end_nursery, gboolean precise, ScanCopyContext ctx)
2342 SgenThreadInfo *info;
2344 scan_area_arg_start = start_nursery;
2345 scan_area_arg_end = end_nursery;
2347 FOREACH_THREAD (info) {
2348 int skip_reason = 0;
2349 void *aligned_stack_start = (void*)(mword) ALIGN_TO ((mword)info->client_info.stack_start, SIZEOF_VOID_P);
2351 if (info->client_info.skip) {
2352 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);
2354 } else if (info->client_info.gc_disabled) {
2355 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);
2357 } else if (!mono_thread_info_is_live (info)) {
2358 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);
2362 binary_protocol_scan_stack ((gpointer)mono_thread_info_get_tid (info), info->client_info.stack_start, info->client_info.stack_end, skip_reason);
2367 g_assert (info->client_info.suspend_done);
2368 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 ());
2369 if (mono_gc_get_gc_callbacks ()->thread_mark_func && !conservative_stack_mark) {
2370 mono_gc_get_gc_callbacks ()->thread_mark_func (info->client_info.runtime_data, aligned_stack_start, info->client_info.stack_end, precise, &ctx);
2371 } else if (!precise) {
2372 if (!conservative_stack_mark) {
2373 fprintf (stderr, "Precise stack mark not supported - disabling.\n");
2374 conservative_stack_mark = TRUE;
2376 sgen_conservatively_pin_objects_from (aligned_stack_start, info->client_info.stack_end, start_nursery, end_nursery, PIN_TYPE_STACK);
2381 sgen_conservatively_pin_objects_from ((void**)&info->client_info.ctx, (void**)&info->client_info.ctx + ARCH_NUM_REGS,
2382 start_nursery, end_nursery, PIN_TYPE_STACK);
2384 sgen_conservatively_pin_objects_from ((void**)&info->client_info.regs, (void**)&info->client_info.regs + ARCH_NUM_REGS,
2385 start_nursery, end_nursery, PIN_TYPE_STACK);
2388 // This is used on Coop GC for platforms where we cannot get the data for individual registers.
2389 // We force a spill of all registers into the stack and pass a chunk of data into sgen.
2390 MonoThreadUnwindState *state = &info->client_info.info.thread_saved_state [SELF_SUSPEND_STATE_INDEX];
2391 if (state && state->gc_stackdata) {
2392 sgen_conservatively_pin_objects_from (state->gc_stackdata, (void**)((char*)state->gc_stackdata + state->gc_stackdata_size),
2393 start_nursery, end_nursery, PIN_TYPE_STACK);
2397 } END_FOREACH_THREAD
2401 * mono_gc_set_stack_end:
2403 * Set the end of the current threads stack to STACK_END. The stack space between
2404 * STACK_END and the real end of the threads stack will not be scanned during collections.
2407 mono_gc_set_stack_end (void *stack_end)
2409 SgenThreadInfo *info;
2412 info = mono_thread_info_current ();
2414 SGEN_ASSERT (0, stack_end < info->client_info.stack_end, "Can only lower stack end");
2415 info->client_info.stack_end = stack_end;
2425 mono_gc_register_root (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2427 return sgen_register_root (start, size, descr, descr ? ROOT_TYPE_NORMAL : ROOT_TYPE_PINNED, source, msg);
2431 mono_gc_register_root_wbarrier (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2433 return sgen_register_root (start, size, descr, ROOT_TYPE_WBARRIER, source, msg);
2437 mono_gc_deregister_root (char* addr)
2439 sgen_deregister_root (addr);
2448 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
2450 return pthread_create (new_thread, attr, start_routine, arg);
2459 sgen_client_total_allocated_heap_changed (size_t allocated_heap)
2461 mono_runtime_resource_check_limit (MONO_RESOURCE_GC_HEAP, allocated_heap);
2465 mono_gc_user_markers_supported (void)
2471 mono_object_is_alive (MonoObject* o)
2477 mono_gc_get_generation (MonoObject *obj)
2479 if (sgen_ptr_in_nursery (obj))
2485 mono_gc_enable_events (void)
2490 mono_gc_get_gc_name (void)
2496 mono_gc_get_description (void)
2498 return g_strdup ("sgen");
2502 mono_gc_set_desktop_mode (void)
2507 mono_gc_is_moving (void)
2513 mono_gc_is_disabled (void)
2519 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
2526 mono_gc_max_generation (void)
2532 mono_gc_precise_stack_mark_enabled (void)
2534 return !conservative_stack_mark;
2538 mono_gc_collect (int generation)
2540 sgen_gc_collect (generation);
2544 mono_gc_collection_count (int generation)
2546 return sgen_gc_collection_count (generation);
2550 mono_gc_get_used_size (void)
2552 return (int64_t)sgen_gc_get_used_size ();
2556 mono_gc_get_heap_size (void)
2558 return (int64_t)sgen_gc_get_total_heap_allocation ();
2562 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
2564 return sgen_make_user_root_descriptor (marker);
2568 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
2570 return SGEN_DESC_STRING;
2574 mono_gc_get_nursery (int *shift_bits, size_t *size)
2576 *size = sgen_nursery_size;
2577 *shift_bits = DEFAULT_NURSERY_BITS;
2578 return sgen_get_nursery_start ();
2582 mono_gc_get_los_limit (void)
2584 return SGEN_MAX_SMALL_OBJ_SIZE;
2588 sgen_client_default_metadata (void)
2590 return mono_domain_get ();
2594 sgen_client_metadata_for_object (GCObject *obj)
2596 return mono_object_domain (obj);
2600 * mono_gchandle_is_in_domain:
2601 * @gchandle: a GCHandle's handle.
2602 * @domain: An application domain.
2604 * Returns: true if the object wrapped by the @gchandle belongs to the specific @domain.
2607 mono_gchandle_is_in_domain (guint32 gchandle, MonoDomain *domain)
2609 MonoDomain *gchandle_domain = sgen_gchandle_get_metadata (gchandle);
2610 return domain->domain_id == gchandle_domain->domain_id;
2614 * mono_gchandle_free_domain:
2615 * @unloading: domain that is unloading
2617 * Function used internally to cleanup any GC handle for objects belonging
2618 * to the specified domain during appdomain unload.
2621 mono_gchandle_free_domain (MonoDomain *unloading)
2626 null_link_if_in_domain (gpointer hidden, GCHandleType handle_type, int max_generation, gpointer user)
2628 MonoDomain *unloading_domain = user;
2629 MonoDomain *obj_domain;
2630 gboolean is_weak = MONO_GC_HANDLE_TYPE_IS_WEAK (handle_type);
2631 if (MONO_GC_HANDLE_IS_OBJECT_POINTER (hidden)) {
2632 MonoObject *obj = MONO_GC_REVEAL_POINTER (hidden, is_weak);
2633 obj_domain = mono_object_domain (obj);
2635 obj_domain = MONO_GC_REVEAL_POINTER (hidden, is_weak);
2637 if (unloading_domain->domain_id == obj_domain->domain_id)
2643 sgen_null_links_for_domain (MonoDomain *domain)
2646 for (type = HANDLE_TYPE_MIN; type < HANDLE_TYPE_MAX; ++type)
2647 sgen_gchandle_iterate (type, GENERATION_OLD, null_link_if_in_domain, domain);
2651 mono_gchandle_set_target (guint32 gchandle, MonoObject *obj)
2653 sgen_gchandle_set_target (gchandle, obj);
2657 sgen_client_gchandle_created (int handle_type, GCObject *obj, guint32 handle)
2659 #ifndef DISABLE_PERFCOUNTERS
2660 mono_perfcounters->gc_num_handles++;
2662 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_CREATED, handle_type, handle, obj);
2666 sgen_client_gchandle_destroyed (int handle_type, guint32 handle)
2668 #ifndef DISABLE_PERFCOUNTERS
2669 mono_perfcounters->gc_num_handles--;
2671 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_DESTROYED, handle_type, handle, NULL);
2675 sgen_client_ensure_weak_gchandles_accessible (void)
2678 * During the second bridge processing step the world is
2679 * running again. That step processes all weak links once
2680 * more to null those that refer to dead objects. Before that
2681 * is completed, those links must not be followed, so we
2682 * conservatively wait for bridge processing when any weak
2683 * link is dereferenced.
2685 /* FIXME: A GC can occur after this check fails, in which case we
2686 * should wait for bridge processing but would fail to do so.
2688 if (G_UNLIKELY (bridge_processing_in_progress))
2689 mono_gc_wait_for_bridge_processing ();
2693 mono_gc_set_allow_synchronous_major (gboolean flag)
2695 return sgen_set_allow_synchronous_major (flag);
2699 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
2703 result = func (data);
2704 UNLOCK_INTERRUPTION;
2709 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
2715 sgen_client_out_of_memory (size_t size)
2717 mono_gc_out_of_memory (size);
2721 mono_gc_get_card_table (int *shift_bits, gpointer *mask)
2723 return sgen_get_card_table_configuration (shift_bits, mask);
2727 mono_gc_card_table_nursery_check (void)
2729 return !sgen_get_major_collector ()->is_concurrent;
2732 /* Negative value to remove */
2734 mono_gc_add_memory_pressure (gint64 value)
2736 /* FIXME: Implement at some point? */
2744 sgen_client_degraded_allocation (size_t size)
2746 static int last_major_gc_warned = -1;
2747 static int num_degraded = 0;
2749 if (last_major_gc_warned < gc_stats.major_gc_count) {
2751 if (num_degraded == 1 || num_degraded == 3)
2752 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Degraded allocation. Consider increasing nursery-size if the warning persists.");
2753 else if (num_degraded == 10)
2754 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Repeated degraded allocation. Consider increasing nursery-size.");
2755 last_major_gc_warned = gc_stats.major_gc_count;
2760 sgen_client_log_timing (GGTimingInfo *info, mword last_major_num_sections, mword last_los_memory_usage)
2762 SgenMajorCollector *major_collector = sgen_get_major_collector ();
2763 mword num_major_sections = major_collector->get_num_major_sections ();
2764 char full_timing_buff [1024];
2765 full_timing_buff [0] = '\0';
2767 if (!info->is_overflow)
2768 sprintf (full_timing_buff, "total %.2fms, bridge %.2fms", info->stw_time / 10000.0f, (int)info->bridge_time / 10000.0f);
2769 if (info->generation == GENERATION_OLD)
2770 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "GC_MAJOR%s: (%s) pause %.2fms, %s major %dK/%dK los %dK/%dK",
2771 info->is_overflow ? "_OVERFLOW" : "",
2772 info->reason ? info->reason : "",
2773 (int)info->total_time / 10000.0f,
2775 major_collector->section_size * num_major_sections / 1024,
2776 major_collector->section_size * last_major_num_sections / 1024,
2777 los_memory_usage / 1024,
2778 last_los_memory_usage / 1024);
2780 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "GC_MINOR%s: (%s) pause %.2fms, %s promoted %dK major %dK los %dK",
2781 info->is_overflow ? "_OVERFLOW" : "",
2782 info->reason ? info->reason : "",
2783 (int)info->total_time / 10000.0f,
2785 (num_major_sections - last_major_num_sections) * major_collector->section_size / 1024,
2786 major_collector->section_size * num_major_sections / 1024,
2787 los_memory_usage / 1024);
2795 sgen_client_description_for_internal_mem_type (int type)
2798 case INTERNAL_MEM_EPHEMERON_LINK: return "ephemeron-link";
2805 sgen_client_pre_collection_checks (void)
2807 if (sgen_mono_xdomain_checks) {
2808 sgen_clear_nursery_fragments ();
2809 sgen_check_for_xdomain_refs ();
2814 sgen_client_vtable_is_inited (MonoVTable *vt)
2816 return vt->klass->inited;
2820 sgen_client_vtable_get_namespace (MonoVTable *vt)
2822 return vt->klass->name_space;
2826 sgen_client_vtable_get_name (MonoVTable *vt)
2828 return vt->klass->name;
2836 sgen_client_init (void)
2839 MonoThreadInfoCallbacks cb;
2841 cb.thread_register = sgen_thread_register;
2842 cb.thread_detach = sgen_thread_detach;
2843 cb.thread_unregister = sgen_thread_unregister;
2844 cb.thread_attach = sgen_thread_attach;
2845 cb.mono_method_is_critical = (gpointer)is_critical_method;
2846 cb.mono_thread_in_critical_region = thread_in_critical_region;
2848 mono_threads_init (&cb, sizeof (SgenThreadInfo));
2850 ///* Keep this the default for now */
2851 /* Precise marking is broken on all supported targets. Disable until fixed. */
2852 conservative_stack_mark = TRUE;
2854 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_EPHEMERON_LINK, sizeof (EphemeronLinkNode));
2856 mono_sgen_init_stw ();
2858 #ifndef HAVE_KW_THREAD
2859 mono_native_tls_alloc (&thread_info_key, NULL);
2860 #if defined(TARGET_OSX) || defined(TARGET_WIN32) || defined(TARGET_ANDROID) || defined(TARGET_IOS)
2862 * CEE_MONO_TLS requires the tls offset, not the key, so the code below only works on darwin,
2863 * where the two are the same.
2865 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO, thread_info_key);
2869 int tls_offset = -1;
2870 MONO_THREAD_VAR_OFFSET (sgen_thread_info, tls_offset);
2871 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO, tls_offset);
2876 * This needs to happen before any internal allocations because
2877 * it inits the small id which is required for hazard pointer
2882 mono_gc_register_thread (&dummy);
2886 sgen_client_handle_gc_param (const char *opt)
2888 if (g_str_has_prefix (opt, "stack-mark=")) {
2889 opt = strchr (opt, '=') + 1;
2890 if (!strcmp (opt, "precise")) {
2891 conservative_stack_mark = FALSE;
2892 } else if (!strcmp (opt, "conservative")) {
2893 conservative_stack_mark = TRUE;
2895 sgen_env_var_error (MONO_GC_PARAMS_NAME, conservative_stack_mark ? "Using `conservative`." : "Using `precise`.",
2896 "Invalid value `%s` for `stack-mark` option, possible values are: `precise`, `conservative`.", opt);
2898 } else if (g_str_has_prefix (opt, "bridge-implementation=")) {
2899 opt = strchr (opt, '=') + 1;
2900 sgen_set_bridge_implementation (opt);
2901 } else if (g_str_has_prefix (opt, "toggleref-test")) {
2902 /* FIXME: This should probably in MONO_GC_DEBUG */
2903 sgen_register_test_toggleref_callback ();
2911 sgen_client_print_gc_params_usage (void)
2913 fprintf (stderr, " stack-mark=MARK-METHOD (where MARK-METHOD is 'precise' or 'conservative')\n");
2917 sgen_client_handle_gc_debug (const char *opt)
2919 if (!strcmp (opt, "xdomain-checks")) {
2920 sgen_mono_xdomain_checks = TRUE;
2921 } else if (!strcmp (opt, "do-not-finalize")) {
2922 mono_do_not_finalize = TRUE;
2923 } else if (g_str_has_prefix (opt, "do-not-finalize=")) {
2924 opt = strchr (opt, '=') + 1;
2925 mono_do_not_finalize = TRUE;
2926 mono_do_not_finalize_class_names = g_strsplit (opt, ",", 0);
2927 } else if (!strcmp (opt, "log-finalizers")) {
2928 log_finalizers = TRUE;
2929 } else if (!strcmp (opt, "no-managed-allocator")) {
2930 sgen_set_use_managed_allocator (FALSE);
2931 } else if (!sgen_bridge_handle_gc_debug (opt)) {
2938 sgen_client_print_gc_debug_usage (void)
2940 fprintf (stderr, " xdomain-checks\n");
2941 fprintf (stderr, " do-not-finalize\n");
2942 fprintf (stderr, " log-finalizers\n");
2943 fprintf (stderr, " no-managed-allocator\n");
2944 sgen_bridge_print_gc_debug_usage ();
2949 sgen_client_get_provenance (void)
2951 #ifdef SGEN_OBJECT_PROVENANCE
2952 MonoGCCallbacks *cb = mono_gc_get_gc_callbacks ();
2953 gpointer (*get_provenance_func) (void);
2956 get_provenance_func = cb->get_provenance_func;
2957 if (get_provenance_func)
2958 return get_provenance_func ();
2966 sgen_client_describe_invalid_pointer (GCObject *ptr)
2968 sgen_bridge_describe_pointer (ptr);
2972 mono_gc_base_init (void)
2974 mono_counters_init ();
2976 #ifdef HEAVY_STATISTICS
2977 mono_counters_register ("los marked cards", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_marked_cards);
2978 mono_counters_register ("los array cards scanned ", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_cards);
2979 mono_counters_register ("los array remsets", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_remsets);
2981 mono_counters_register ("WBarrier set arrayref", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_set_arrayref);
2982 mono_counters_register ("WBarrier value copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_value_copy);
2983 mono_counters_register ("WBarrier object copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_object_copy);
2988 if (nursery_canaries_enabled ())
2989 sgen_set_use_managed_allocator (FALSE);
2993 mono_gc_base_cleanup (void)
2998 mono_gc_is_null (void)