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_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;
253 #ifdef MANAGED_WBARRIER
254 int i, nursery_check_labels [2];
257 // FIXME: Maybe create a separate version for ctors (the branch would be
258 // correctly predicted more times)
260 write_barrier_method_addr = &write_barrier_conc_method;
262 write_barrier_method_addr = &write_barrier_noconc_method;
264 if (*write_barrier_method_addr)
265 return *write_barrier_method_addr;
267 /* Create the IL version of mono_gc_barrier_generic_store () */
268 sig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
269 sig->ret = &mono_defaults.void_class->byval_arg;
270 sig->params [0] = &mono_defaults.int_class->byval_arg;
273 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_conc", MONO_WRAPPER_WRITE_BARRIER);
275 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_noconc", MONO_WRAPPER_WRITE_BARRIER);
278 #ifdef MANAGED_WBARRIER
279 emit_nursery_check (mb, nursery_check_labels, is_concurrent);
281 addr = sgen_cardtable + ((address >> CARD_BITS) & CARD_MASK)
285 LDC_PTR sgen_cardtable
291 if (SGEN_HAVE_OVERLAPPING_CARDS) {
292 LDC_PTR card_table_mask
299 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
300 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_CARD_TABLE);
301 mono_mb_emit_ldarg (mb, 0);
302 mono_mb_emit_icon (mb, CARD_BITS);
303 mono_mb_emit_byte (mb, CEE_SHR_UN);
304 mono_mb_emit_byte (mb, CEE_CONV_I);
305 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
306 #if SIZEOF_VOID_P == 8
307 mono_mb_emit_icon8 (mb, CARD_MASK);
309 mono_mb_emit_icon (mb, CARD_MASK);
311 mono_mb_emit_byte (mb, CEE_CONV_I);
312 mono_mb_emit_byte (mb, CEE_AND);
314 mono_mb_emit_byte (mb, CEE_ADD);
315 mono_mb_emit_icon (mb, 1);
316 mono_mb_emit_byte (mb, CEE_STIND_I1);
319 for (i = 0; i < 2; ++i) {
320 if (nursery_check_labels [i])
321 mono_mb_patch_branch (mb, nursery_check_labels [i]);
323 mono_mb_emit_byte (mb, CEE_RET);
325 mono_mb_emit_ldarg (mb, 0);
326 mono_mb_emit_icall (mb, mono_gc_wbarrier_generic_nostore);
327 mono_mb_emit_byte (mb, CEE_RET);
330 res = mono_mb_create_method (mb, sig, 16);
331 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
332 /* The generated barrier depends on this being the same at runtime */
333 info->d.wbarrier.nursery_bits = DEFAULT_NURSERY_BITS;
334 mono_marshal_set_wrapper_info (res, info);
338 if (*write_barrier_method_addr) {
339 /* Already created */
340 mono_free_method (res);
342 /* double-checked locking */
343 mono_memory_barrier ();
344 *write_barrier_method_addr = res;
348 return *write_barrier_method_addr;
352 mono_gc_get_write_barrier (void)
354 return mono_gc_get_specific_write_barrier (major_collector.is_concurrent);
358 * Dummy filler objects
361 /* Vtable of the objects used to fill out nursery fragments before a collection */
362 static GCVTable array_fill_vtable;
365 get_array_fill_vtable (void)
367 if (!array_fill_vtable) {
368 static MonoClass klass;
369 static char _vtable[sizeof(MonoVTable)+8];
370 MonoVTable* vtable = (MonoVTable*) ALIGN_TO((mword)_vtable, 8);
373 MonoDomain *domain = mono_get_root_domain ();
376 klass.element_class = mono_defaults.byte_class;
378 klass.instance_size = sizeof (MonoArray);
379 klass.sizes.element_size = 1;
380 klass.name = "array_filler_type";
382 vtable->klass = &klass;
384 vtable->gc_descr = mono_gc_make_descr_for_array (TRUE, &bmap, 0, 1);
387 array_fill_vtable = vtable;
389 return array_fill_vtable;
393 sgen_client_array_fill_range (char *start, size_t size)
397 if (size < sizeof (MonoArray)) {
398 memset (start, 0, size);
402 o = (MonoArray*)start;
403 o->obj.vtable = (MonoVTable*)get_array_fill_vtable ();
404 /* Mark this as not a real object */
405 o->obj.synchronisation = GINT_TO_POINTER (-1);
407 o->max_length = (mono_array_size_t)(size - sizeof (MonoArray));
413 sgen_client_zero_array_fill_header (void *p, size_t size)
415 if (size >= sizeof (MonoArray)) {
416 memset (p, 0, sizeof (MonoArray));
418 static guint8 zeros [sizeof (MonoArray)];
420 SGEN_ASSERT (0, !memcmp (p, zeros, size), "TLAB segment must be zeroed out.");
428 static MonoGCFinalizerCallbacks fin_callbacks;
431 mono_gc_get_vtable_bits (MonoClass *class)
434 /* FIXME move this to the bridge code */
435 if (sgen_need_bridge_processing ()) {
436 switch (sgen_bridge_class_kind (class)) {
437 case GC_BRIDGE_TRANSPARENT_BRIDGE_CLASS:
438 case GC_BRIDGE_OPAQUE_BRIDGE_CLASS:
439 res = SGEN_GC_BIT_BRIDGE_OBJECT;
441 case GC_BRIDGE_OPAQUE_CLASS:
442 res = SGEN_GC_BIT_BRIDGE_OPAQUE_OBJECT;
444 case GC_BRIDGE_TRANSPARENT_CLASS:
448 if (fin_callbacks.is_class_finalization_aware) {
449 if (fin_callbacks.is_class_finalization_aware (class))
450 res |= SGEN_GC_BIT_FINALIZER_AWARE;
456 is_finalization_aware (MonoObject *obj)
458 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
459 return (vt->gc_bits & SGEN_GC_BIT_FINALIZER_AWARE) == SGEN_GC_BIT_FINALIZER_AWARE;
463 sgen_client_object_queued_for_finalization (GCObject *obj)
465 if (fin_callbacks.object_queued_for_finalization && is_finalization_aware (obj))
466 fin_callbacks.object_queued_for_finalization (obj);
469 if (G_UNLIKELY (MONO_GC_FINALIZE_ENQUEUE_ENABLED ())) {
470 int gen = sgen_ptr_in_nursery (obj) ? GENERATION_NURSERY : GENERATION_OLD;
471 GCVTable vt = SGEN_LOAD_VTABLE (obj);
472 MONO_GC_FINALIZE_ENQUEUE ((mword)obj, sgen_safe_object_get_size (obj),
473 sgen_client_vtable_get_namespace (vt), sgen_client_vtable_get_name (vt), gen,
474 sgen_client_object_has_critical_finalizer (obj));
480 mono_gc_register_finalizer_callbacks (MonoGCFinalizerCallbacks *callbacks)
482 if (callbacks->version != MONO_GC_FINALIZER_EXTENSION_VERSION)
483 g_error ("Invalid finalizer callback version. Expected %d but got %d\n", MONO_GC_FINALIZER_EXTENSION_VERSION, callbacks->version);
485 fin_callbacks = *callbacks;
489 sgen_client_run_finalize (MonoObject *obj)
491 mono_gc_run_finalize (obj, NULL);
495 mono_gc_invoke_finalizers (void)
497 return sgen_gc_invoke_finalizers ();
501 mono_gc_pending_finalizers (void)
503 return sgen_have_pending_finalizers ();
507 sgen_client_finalize_notify (void)
509 mono_gc_finalize_notify ();
513 mono_gc_register_for_finalization (MonoObject *obj, void *user_data)
515 sgen_object_register_for_finalization (obj, user_data);
519 object_in_domain_predicate (MonoObject *obj, void *user_data)
521 MonoDomain *domain = user_data;
522 if (mono_object_domain (obj) == domain) {
523 SGEN_LOG (5, "Unregistering finalizer for object: %p (%s)", obj, sgen_client_vtable_get_name (SGEN_LOAD_VTABLE (obj)));
530 * mono_gc_finalizers_for_domain:
531 * @domain: the unloading appdomain
532 * @out_array: output array
533 * @out_size: size of output array
535 * Store inside @out_array up to @out_size objects that belong to the unloading
536 * appdomain @domain. Returns the number of stored items. Can be called repeteadly
537 * until it returns 0.
538 * The items are removed from the finalizer data structure, so the caller is supposed
540 * @out_array should be on the stack to allow the GC to know the objects are still alive.
543 mono_gc_finalizers_for_domain (MonoDomain *domain, MonoObject **out_array, int out_size)
545 return sgen_gather_finalizers_if (object_in_domain_predicate, domain, out_array, out_size);
552 typedef struct _EphemeronLinkNode EphemeronLinkNode;
554 struct _EphemeronLinkNode {
555 EphemeronLinkNode *next;
564 static EphemeronLinkNode *ephemeron_list;
566 /* LOCKING: requires that the GC lock is held */
568 null_ephemerons_for_domain (MonoDomain *domain)
570 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
573 MonoObject *object = (MonoObject*)current->array;
576 SGEN_ASSERT (0, object->vtable, "Can't have objects without vtables.");
578 if (object && object->vtable->domain == domain) {
579 EphemeronLinkNode *tmp = current;
582 prev->next = current->next;
584 ephemeron_list = current->next;
586 current = current->next;
587 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
590 current = current->next;
595 /* LOCKING: requires that the GC lock is held */
597 sgen_client_clear_unreachable_ephemerons (ScanCopyContext ctx)
599 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
600 SgenGrayQueue *queue = ctx.queue;
601 EphemeronLinkNode *current = ephemeron_list, *prev = NULL;
602 Ephemeron *cur, *array_end;
606 MonoArray *array = current->array;
608 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
609 EphemeronLinkNode *tmp = current;
611 SGEN_LOG (5, "Dead Ephemeron array at %p", array);
614 prev->next = current->next;
616 ephemeron_list = current->next;
618 current = current->next;
619 sgen_free_internal (tmp, INTERNAL_MEM_EPHEMERON_LINK);
624 copy_func ((GCObject**)&array, queue);
625 current->array = array;
627 SGEN_LOG (5, "Clearing unreachable entries for ephemeron array at %p", array);
629 cur = mono_array_addr (array, Ephemeron, 0);
630 array_end = cur + mono_array_length_fast (array);
631 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
633 for (; cur < array_end; ++cur) {
634 GCObject *key = cur->key;
636 if (!key || key == tombstone)
639 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
640 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
641 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
643 if (!sgen_is_object_alive_for_current_gen (key)) {
644 cur->key = tombstone;
650 current = current->next;
655 LOCKING: requires that the GC lock is held
657 Limitations: We scan all ephemerons on every collection since the current design doesn't allow for a simple nursery/mature split.
660 sgen_client_mark_ephemerons (ScanCopyContext ctx)
662 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
663 SgenGrayQueue *queue = ctx.queue;
664 gboolean nothing_marked = TRUE;
665 EphemeronLinkNode *current = ephemeron_list;
666 Ephemeron *cur, *array_end;
669 for (current = ephemeron_list; current; current = current->next) {
670 MonoArray *array = current->array;
671 SGEN_LOG (5, "Ephemeron array at %p", array);
673 /*It has to be alive*/
674 if (!sgen_is_object_alive_for_current_gen ((GCObject*)array)) {
675 SGEN_LOG (5, "\tnot reachable");
679 copy_func ((GCObject**)&array, queue);
681 cur = mono_array_addr (array, Ephemeron, 0);
682 array_end = cur + mono_array_length_fast (array);
683 tombstone = SGEN_LOAD_VTABLE ((GCObject*)array)->domain->ephemeron_tombstone;
685 for (; cur < array_end; ++cur) {
686 GCObject *key = cur->key;
688 if (!key || key == tombstone)
691 SGEN_LOG (5, "[%zd] key %p (%s) value %p (%s)", cur - mono_array_addr (array, Ephemeron, 0),
692 key, sgen_is_object_alive_for_current_gen (key) ? "reachable" : "unreachable",
693 cur->value, cur->value && sgen_is_object_alive_for_current_gen (cur->value) ? "reachable" : "unreachable");
695 if (sgen_is_object_alive_for_current_gen (key)) {
696 GCObject *value = cur->value;
698 copy_func (&cur->key, queue);
700 if (!sgen_is_object_alive_for_current_gen (value))
701 nothing_marked = FALSE;
702 copy_func (&cur->value, queue);
708 SGEN_LOG (5, "Ephemeron run finished. Is it done %d", nothing_marked);
709 return nothing_marked;
713 mono_gc_ephemeron_array_add (MonoObject *obj)
715 EphemeronLinkNode *node;
719 node = sgen_alloc_internal (INTERNAL_MEM_EPHEMERON_LINK);
724 node->array = (MonoArray*)obj;
725 node->next = ephemeron_list;
726 ephemeron_list = node;
728 SGEN_LOG (5, "Registered ephemeron array %p", obj);
739 mono_gc_set_current_thread_appdomain (MonoDomain *domain)
741 SgenThreadInfo *info = mono_thread_info_current ();
743 /* Could be called from sgen_thread_unregister () with a NULL info */
746 info->client_info.stopped_domain = domain;
751 need_remove_object_for_domain (GCObject *start, MonoDomain *domain)
753 if (mono_object_domain (start) == domain) {
754 SGEN_LOG (4, "Need to cleanup object %p", start);
755 binary_protocol_cleanup (start, (gpointer)SGEN_LOAD_VTABLE (start), sgen_safe_object_get_size ((GCObject*)start));
762 process_object_for_domain_clearing (GCObject *start, MonoDomain *domain)
764 MonoVTable *vt = SGEN_LOAD_VTABLE (start);
765 if (vt->klass == mono_defaults.internal_thread_class)
766 g_assert (mono_object_domain (start) == mono_get_root_domain ());
767 /* The object could be a proxy for an object in the domain
769 #ifndef DISABLE_REMOTING
770 if (mono_defaults.real_proxy_class->supertypes && mono_class_has_parent_fast (vt->klass, mono_defaults.real_proxy_class)) {
771 MonoObject *server = ((MonoRealProxy*)start)->unwrapped_server;
773 /* The server could already have been zeroed out, so
774 we need to check for that, too. */
775 if (server && (!SGEN_LOAD_VTABLE (server) || mono_object_domain (server) == domain)) {
776 SGEN_LOG (4, "Cleaning up remote pointer in %p to object %p", start, server);
777 ((MonoRealProxy*)start)->unwrapped_server = NULL;
784 clear_domain_process_object (GCObject *obj, MonoDomain *domain)
788 process_object_for_domain_clearing (obj, domain);
789 remove = need_remove_object_for_domain (obj, domain);
791 if (remove && obj->synchronisation) {
792 guint32 dislink = mono_monitor_get_object_monitor_gchandle (obj);
794 mono_gchandle_free (dislink);
801 clear_domain_process_minor_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
803 if (clear_domain_process_object (obj, domain)) {
804 CANARIFY_SIZE (size);
805 memset (obj, 0, size);
810 clear_domain_process_major_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
812 clear_domain_process_object (obj, domain);
816 clear_domain_free_major_non_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
818 if (need_remove_object_for_domain (obj, domain))
819 major_collector.free_non_pinned_object (obj, size);
823 clear_domain_free_major_pinned_object_callback (GCObject *obj, size_t size, MonoDomain *domain)
825 if (need_remove_object_for_domain (obj, domain))
826 major_collector.free_pinned_object (obj, size);
830 * When appdomains are unloaded we can easily remove objects that have finalizers,
831 * but all the others could still be present in random places on the heap.
832 * We need a sweep to get rid of them even though it's going to be costly
834 * The reason we need to remove them is because we access the vtable and class
835 * structures to know the object size and the reference bitmap: once the domain is
836 * unloaded the point to random memory.
839 mono_gc_clear_domain (MonoDomain * domain)
841 LOSObject *bigobj, *prev;
846 binary_protocol_domain_unload_begin (domain);
850 if (sgen_concurrent_collection_in_progress ())
851 sgen_perform_collection (0, GENERATION_OLD, "clear domain", TRUE);
852 SGEN_ASSERT (0, !sgen_concurrent_collection_in_progress (), "We just ordered a synchronous collection. Why are we collecting concurrently?");
854 major_collector.finish_sweeping ();
856 sgen_process_fin_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);
869 sgen_null_links_for_domain (domain);
871 for (i = GENERATION_NURSERY; i < GENERATION_MAX; ++i)
872 sgen_remove_finalizers_if (object_in_domain_predicate, domain, i);
874 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data,
875 (IterateObjectCallbackFunc)clear_domain_process_minor_object_callback, domain, FALSE, TRUE);
877 /* We need two passes over major and large objects because
878 freeing such objects might give their memory back to the OS
879 (in the case of large objects) or obliterate its vtable
880 (pinned objects with major-copying or pinned and non-pinned
881 objects with major-mark&sweep), but we might need to
882 dereference a pointer from an object to another object if
883 the first object is a proxy. */
884 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, (IterateObjectCallbackFunc)clear_domain_process_major_object_callback, domain);
885 for (bigobj = los_object_list; bigobj; bigobj = bigobj->next)
886 clear_domain_process_object ((GCObject*)bigobj->data, domain);
889 for (bigobj = los_object_list; bigobj;) {
890 if (need_remove_object_for_domain ((GCObject*)bigobj->data, domain)) {
891 LOSObject *to_free = bigobj;
893 prev->next = bigobj->next;
895 los_object_list = bigobj->next;
896 bigobj = bigobj->next;
897 SGEN_LOG (4, "Freeing large object %p", bigobj->data);
898 sgen_los_free_object (to_free);
902 bigobj = bigobj->next;
904 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_NON_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_non_pinned_object_callback, domain);
905 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_PINNED, (IterateObjectCallbackFunc)clear_domain_free_major_pinned_object_callback, domain);
907 if (domain == mono_get_root_domain ()) {
908 sgen_pin_stats_print_class_stats ();
909 sgen_object_layout_dump (stdout);
912 sgen_restart_world (0, NULL);
914 binary_protocol_domain_unload_end (domain);
915 binary_protocol_flush_buffers (FALSE);
924 static gboolean alloc_events = FALSE;
927 mono_gc_enable_alloc_events (void)
933 mono_gc_alloc_obj (MonoVTable *vtable, size_t size)
935 MonoObject *obj = sgen_alloc_obj (vtable, size);
937 if (G_UNLIKELY (alloc_events))
938 mono_profiler_allocation (obj);
944 mono_gc_alloc_pinned_obj (MonoVTable *vtable, size_t size)
946 MonoObject *obj = sgen_alloc_obj_pinned (vtable, size);
948 if (G_UNLIKELY (alloc_events))
949 mono_profiler_allocation (obj);
955 mono_gc_alloc_mature (MonoVTable *vtable)
957 MonoObject *obj = sgen_alloc_obj_mature (vtable, vtable->klass->instance_size);
959 if (obj && G_UNLIKELY (obj->vtable->klass->has_finalize))
960 mono_object_register_finalizer (obj);
962 if (G_UNLIKELY (alloc_events))
963 mono_profiler_allocation (obj);
969 mono_gc_alloc_fixed (size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
971 /* FIXME: do a single allocation */
972 void *res = calloc (1, size);
975 if (!mono_gc_register_root (res, size, descr, source, msg)) {
983 mono_gc_free_fixed (void* addr)
985 mono_gc_deregister_root (addr);
993 static MonoMethod* alloc_method_cache [ATYPE_NUM];
994 static MonoMethod* slowpath_alloc_method_cache [ATYPE_NUM];
995 static gboolean use_managed_allocator = TRUE;
997 #ifdef MANAGED_ALLOCATION
999 #ifdef HAVE_KW_THREAD
1001 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { \
1002 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1003 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1004 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_TLAB_NEXT_ADDR); \
1007 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { \
1008 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1009 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1010 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_TLAB_TEMP_END); \
1015 #if defined(TARGET_OSX) || defined(TARGET_WIN32) || defined(TARGET_ANDROID) || defined(TARGET_IOS)
1016 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { \
1017 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1018 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1019 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1020 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_next_addr)); \
1021 mono_mb_emit_byte ((mb), CEE_ADD); \
1022 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1025 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { \
1026 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1027 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1028 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1029 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_temp_end)); \
1030 mono_mb_emit_byte ((mb), CEE_ADD); \
1031 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1035 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1036 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1041 /* FIXME: Do this in the JIT, where specialized allocation sequences can be created
1042 * for each class. This is currently not easy to do, as it is hard to generate basic
1043 * blocks + branches, but it is easy with the linear IL codebase.
1045 * For this to work we'd need to solve the TLAB race, first. Now we
1046 * require the allocator to be in a few known methods to make sure
1047 * that they are executed atomically via the restart mechanism.
1050 create_allocator (int atype, gboolean slowpath)
1052 int p_var, size_var;
1053 guint32 slowpath_branch, max_size_branch;
1054 MonoMethodBuilder *mb;
1056 MonoMethodSignature *csig;
1057 static gboolean registered = FALSE;
1058 int tlab_next_addr_var, new_next_var;
1059 const char *name = NULL;
1064 mono_register_jit_icall (mono_gc_alloc_obj, "mono_gc_alloc_obj", mono_create_icall_signature ("object ptr int"), FALSE);
1065 mono_register_jit_icall (mono_gc_alloc_vector, "mono_gc_alloc_vector", mono_create_icall_signature ("object ptr int int"), FALSE);
1066 mono_register_jit_icall (mono_gc_alloc_string, "mono_gc_alloc_string", mono_create_icall_signature ("object ptr int int32"), FALSE);
1070 if (atype == ATYPE_SMALL) {
1071 name = slowpath ? "SlowAllocSmall" : "AllocSmall";
1072 } else if (atype == ATYPE_NORMAL) {
1073 name = slowpath ? "SlowAlloc" : "Alloc";
1074 } else if (atype == ATYPE_VECTOR) {
1075 name = slowpath ? "SlowAllocVector" : "AllocVector";
1076 } else if (atype == ATYPE_STRING) {
1077 name = slowpath ? "SlowAllocString" : "AllocString";
1079 g_assert_not_reached ();
1082 if (atype == ATYPE_NORMAL)
1087 csig = mono_metadata_signature_alloc (mono_defaults.corlib, num_params);
1088 if (atype == ATYPE_STRING) {
1089 csig->ret = &mono_defaults.string_class->byval_arg;
1090 csig->params [0] = &mono_defaults.int_class->byval_arg;
1091 csig->params [1] = &mono_defaults.int32_class->byval_arg;
1093 csig->ret = &mono_defaults.object_class->byval_arg;
1094 for (i = 0; i < num_params; i++)
1095 csig->params [i] = &mono_defaults.int_class->byval_arg;
1098 mb = mono_mb_new (mono_defaults.object_class, name, MONO_WRAPPER_ALLOC);
1105 mono_mb_emit_ldarg (mb, 0);
1106 mono_mb_emit_icall (mb, mono_object_new_specific);
1109 mono_mb_emit_ldarg (mb, 0);
1110 mono_mb_emit_ldarg (mb, 1);
1111 mono_mb_emit_icall (mb, mono_array_new_specific);
1114 mono_mb_emit_ldarg (mb, 1);
1115 mono_mb_emit_icall (mb, mono_string_alloc);
1118 g_assert_not_reached ();
1124 size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1125 if (atype == ATYPE_SMALL) {
1126 /* size_var = size_arg */
1127 mono_mb_emit_ldarg (mb, 1);
1128 mono_mb_emit_stloc (mb, size_var);
1129 } else if (atype == ATYPE_NORMAL) {
1130 /* size = vtable->klass->instance_size; */
1131 mono_mb_emit_ldarg (mb, 0);
1132 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1133 mono_mb_emit_byte (mb, CEE_ADD);
1134 mono_mb_emit_byte (mb, CEE_LDIND_I);
1135 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, instance_size));
1136 mono_mb_emit_byte (mb, CEE_ADD);
1137 /* FIXME: assert instance_size stays a 4 byte integer */
1138 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1139 mono_mb_emit_byte (mb, CEE_CONV_I);
1140 mono_mb_emit_stloc (mb, size_var);
1141 } else if (atype == ATYPE_VECTOR) {
1142 MonoExceptionClause *clause;
1143 int pos, pos_leave, pos_error;
1144 MonoClass *oom_exc_class;
1148 * n > MONO_ARRAY_MAX_INDEX => OutOfMemoryException
1149 * n < 0 => OverflowException
1151 * We can do an unsigned comparison to catch both cases, then in the error
1152 * case compare signed to distinguish between them.
1154 mono_mb_emit_ldarg (mb, 1);
1155 mono_mb_emit_icon (mb, MONO_ARRAY_MAX_INDEX);
1156 mono_mb_emit_byte (mb, CEE_CONV_U);
1157 pos = mono_mb_emit_short_branch (mb, CEE_BLE_UN_S);
1159 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1160 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1161 mono_mb_emit_ldarg (mb, 1);
1162 mono_mb_emit_icon (mb, 0);
1163 pos_error = mono_mb_emit_short_branch (mb, CEE_BLT_S);
1164 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1165 mono_mb_patch_short_branch (mb, pos_error);
1166 mono_mb_emit_exception (mb, "OverflowException", NULL);
1168 mono_mb_patch_short_branch (mb, pos);
1170 clause = mono_image_alloc0 (mono_defaults.corlib, sizeof (MonoExceptionClause));
1171 clause->try_offset = mono_mb_get_label (mb);
1173 /* vtable->klass->sizes.element_size */
1174 mono_mb_emit_ldarg (mb, 0);
1175 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1176 mono_mb_emit_byte (mb, CEE_ADD);
1177 mono_mb_emit_byte (mb, CEE_LDIND_I);
1178 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, sizes));
1179 mono_mb_emit_byte (mb, CEE_ADD);
1180 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1181 mono_mb_emit_byte (mb, CEE_CONV_I);
1184 mono_mb_emit_ldarg (mb, 1);
1185 mono_mb_emit_byte (mb, CEE_MUL_OVF_UN);
1186 /* + sizeof (MonoArray) */
1187 mono_mb_emit_icon (mb, sizeof (MonoArray));
1188 mono_mb_emit_byte (mb, CEE_ADD_OVF_UN);
1189 mono_mb_emit_stloc (mb, size_var);
1191 pos_leave = mono_mb_emit_branch (mb, CEE_LEAVE);
1194 clause->flags = MONO_EXCEPTION_CLAUSE_NONE;
1195 clause->try_len = mono_mb_get_pos (mb) - clause->try_offset;
1196 clause->data.catch_class = mono_class_from_name (mono_defaults.corlib,
1197 "System", "OverflowException");
1198 g_assert (clause->data.catch_class);
1199 clause->handler_offset = mono_mb_get_label (mb);
1201 oom_exc_class = mono_class_from_name (mono_defaults.corlib,
1202 "System", "OutOfMemoryException");
1203 g_assert (oom_exc_class);
1204 ctor = mono_class_get_method_from_name (oom_exc_class, ".ctor", 0);
1207 mono_mb_emit_byte (mb, CEE_POP);
1208 mono_mb_emit_op (mb, CEE_NEWOBJ, ctor);
1209 mono_mb_emit_byte (mb, CEE_THROW);
1211 clause->handler_len = mono_mb_get_pos (mb) - clause->handler_offset;
1212 mono_mb_set_clauses (mb, 1, clause);
1213 mono_mb_patch_branch (mb, pos_leave);
1215 } else if (atype == ATYPE_STRING) {
1219 * a string allocator method takes the args: (vtable, len)
1221 * bytes = offsetof (MonoString, chars) + ((len + 1) * 2)
1225 * bytes <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1229 * offsetof (MonoString, chars) + ((len + 1) * 2) <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1230 * len <= (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - offsetof (MonoString, chars)) / 2 - 1
1232 mono_mb_emit_ldarg (mb, 1);
1233 mono_mb_emit_icon (mb, (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - MONO_STRUCT_OFFSET (MonoString, chars)) / 2 - 1);
1234 pos = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
1236 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1237 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1238 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1239 mono_mb_patch_short_branch (mb, pos);
1241 mono_mb_emit_ldarg (mb, 1);
1242 mono_mb_emit_icon (mb, 1);
1243 mono_mb_emit_byte (mb, MONO_CEE_SHL);
1244 //WE manually fold the above + 2 here
1245 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, chars) + 2);
1246 mono_mb_emit_byte (mb, CEE_ADD);
1247 mono_mb_emit_stloc (mb, size_var);
1249 g_assert_not_reached ();
1252 if (atype != ATYPE_SMALL) {
1253 /* size += ALLOC_ALIGN - 1; */
1254 mono_mb_emit_ldloc (mb, size_var);
1255 mono_mb_emit_icon (mb, SGEN_ALLOC_ALIGN - 1);
1256 mono_mb_emit_byte (mb, CEE_ADD);
1257 /* size &= ~(ALLOC_ALIGN - 1); */
1258 mono_mb_emit_icon (mb, ~(SGEN_ALLOC_ALIGN - 1));
1259 mono_mb_emit_byte (mb, CEE_AND);
1260 mono_mb_emit_stloc (mb, size_var);
1263 /* if (size > MAX_SMALL_OBJ_SIZE) goto slowpath */
1264 if (atype != ATYPE_SMALL) {
1265 mono_mb_emit_ldloc (mb, size_var);
1266 mono_mb_emit_icon (mb, SGEN_MAX_SMALL_OBJ_SIZE);
1267 max_size_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
1271 * We need to modify tlab_next, but the JIT only supports reading, so we read
1272 * another tls var holding its address instead.
1275 /* tlab_next_addr (local) = tlab_next_addr (TLS var) */
1276 tlab_next_addr_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1277 EMIT_TLS_ACCESS_NEXT_ADDR (mb);
1278 mono_mb_emit_stloc (mb, tlab_next_addr_var);
1280 /* p = (void**)tlab_next; */
1281 p_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1282 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1283 mono_mb_emit_byte (mb, CEE_LDIND_I);
1284 mono_mb_emit_stloc (mb, p_var);
1286 /* new_next = (char*)p + size; */
1287 new_next_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1288 mono_mb_emit_ldloc (mb, p_var);
1289 mono_mb_emit_ldloc (mb, size_var);
1290 mono_mb_emit_byte (mb, CEE_CONV_I);
1291 mono_mb_emit_byte (mb, CEE_ADD);
1292 mono_mb_emit_stloc (mb, new_next_var);
1294 /* if (G_LIKELY (new_next < tlab_temp_end)) */
1295 mono_mb_emit_ldloc (mb, new_next_var);
1296 EMIT_TLS_ACCESS_TEMP_END (mb);
1297 slowpath_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
1300 if (atype != ATYPE_SMALL)
1301 mono_mb_patch_short_branch (mb, max_size_branch);
1303 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1304 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1306 /* FIXME: mono_gc_alloc_obj takes a 'size_t' as an argument, not an int32 */
1307 mono_mb_emit_ldarg (mb, 0);
1308 mono_mb_emit_ldloc (mb, size_var);
1309 if (atype == ATYPE_NORMAL || atype == ATYPE_SMALL) {
1310 mono_mb_emit_icall (mb, mono_gc_alloc_obj);
1311 } else if (atype == ATYPE_VECTOR) {
1312 mono_mb_emit_ldarg (mb, 1);
1313 mono_mb_emit_icall (mb, mono_gc_alloc_vector);
1314 } else if (atype == ATYPE_STRING) {
1315 mono_mb_emit_ldarg (mb, 1);
1316 mono_mb_emit_icall (mb, mono_gc_alloc_string);
1318 g_assert_not_reached ();
1320 mono_mb_emit_byte (mb, CEE_RET);
1323 mono_mb_patch_short_branch (mb, slowpath_branch);
1325 /* FIXME: Memory barrier */
1327 /* tlab_next = new_next */
1328 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1329 mono_mb_emit_ldloc (mb, new_next_var);
1330 mono_mb_emit_byte (mb, CEE_STIND_I);
1332 /*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. */
1333 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1334 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1335 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1338 mono_mb_emit_ldloc (mb, p_var);
1339 mono_mb_emit_ldarg (mb, 0);
1340 mono_mb_emit_byte (mb, CEE_STIND_I);
1342 if (atype == ATYPE_VECTOR) {
1343 /* arr->max_length = max_length; */
1344 mono_mb_emit_ldloc (mb, p_var);
1345 mono_mb_emit_ldflda (mb, MONO_STRUCT_OFFSET (MonoArray, max_length));
1346 mono_mb_emit_ldarg (mb, 1);
1347 #ifdef MONO_BIG_ARRAYS
1348 mono_mb_emit_byte (mb, CEE_STIND_I);
1350 mono_mb_emit_byte (mb, CEE_STIND_I4);
1352 } else if (atype == ATYPE_STRING) {
1353 /* need to set length and clear the last char */
1354 /* s->length = len; */
1355 mono_mb_emit_ldloc (mb, p_var);
1356 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, length));
1357 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1358 mono_mb_emit_ldarg (mb, 1);
1359 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
1360 /* s->chars [len] = 0; */
1361 mono_mb_emit_ldloc (mb, p_var);
1362 mono_mb_emit_ldloc (mb, size_var);
1363 mono_mb_emit_icon (mb, 2);
1364 mono_mb_emit_byte (mb, MONO_CEE_SUB);
1365 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1366 mono_mb_emit_icon (mb, 0);
1367 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
1371 We must make sure both vtable and max_length are globaly visible before returning to managed land.
1373 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1374 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1375 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1378 mono_mb_emit_ldloc (mb, p_var);
1381 mono_mb_emit_byte (mb, CEE_RET);
1384 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
1385 info->d.alloc.gc_name = "sgen";
1386 info->d.alloc.alloc_type = atype;
1388 res = mono_mb_create (mb, csig, 8, info);
1391 mono_method_get_header (res)->init_locals = FALSE;
1400 mono_gc_get_aligned_size_for_allocator (int size)
1402 int aligned_size = size;
1403 aligned_size += SGEN_ALLOC_ALIGN - 1;
1404 aligned_size &= ~(SGEN_ALLOC_ALIGN - 1);
1405 return aligned_size;
1409 * Generate an allocator method implementing the fast path of mono_gc_alloc_obj ().
1410 * The signature of the called method is:
1411 * object allocate (MonoVTable *vtable)
1414 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box, gboolean known_instance_size)
1416 #ifdef MANAGED_ALLOCATION
1417 if (collect_before_allocs)
1419 if (!mono_runtime_has_tls_get ())
1421 if (klass->instance_size > tlab_size)
1423 if (known_instance_size && ALIGN_TO (klass->instance_size, SGEN_ALLOC_ALIGN) >= SGEN_MAX_SMALL_OBJ_SIZE)
1425 if (mono_class_has_finalizer (klass) || mono_class_is_marshalbyref (klass) || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
1429 if (klass->byval_arg.type == MONO_TYPE_STRING)
1430 return mono_gc_get_managed_allocator_by_type (ATYPE_STRING, FALSE);
1431 /* Generic classes have dynamic field and can go above MAX_SMALL_OBJ_SIZE. */
1432 if (known_instance_size)
1433 return mono_gc_get_managed_allocator_by_type (ATYPE_SMALL, FALSE);
1435 return mono_gc_get_managed_allocator_by_type (ATYPE_NORMAL, FALSE);
1442 mono_gc_get_managed_array_allocator (MonoClass *klass)
1444 #ifdef MANAGED_ALLOCATION
1445 if (klass->rank != 1)
1447 if (!mono_runtime_has_tls_get ())
1449 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1451 if (has_per_allocation_action)
1453 g_assert (!mono_class_has_finalizer (klass) && !mono_class_is_marshalbyref (klass));
1455 return mono_gc_get_managed_allocator_by_type (ATYPE_VECTOR, FALSE);
1462 sgen_set_use_managed_allocator (gboolean flag)
1464 use_managed_allocator = flag;
1468 mono_gc_get_managed_allocator_by_type (int atype, gboolean slowpath)
1470 #ifdef MANAGED_ALLOCATION
1472 MonoMethod **cache = slowpath ? slowpath_alloc_method_cache : alloc_method_cache;
1474 if (!use_managed_allocator)
1477 if (!mono_runtime_has_tls_get ())
1480 res = cache [atype];
1484 res = create_allocator (atype, slowpath);
1486 if (cache [atype]) {
1487 mono_free_method (res);
1488 res = cache [atype];
1490 mono_memory_barrier ();
1491 cache [atype] = res;
1502 mono_gc_get_managed_allocator_types (void)
1508 sgen_is_managed_allocator (MonoMethod *method)
1512 for (i = 0; i < ATYPE_NUM; ++i)
1513 if (method == alloc_method_cache [i] || method == slowpath_alloc_method_cache [i])
1519 sgen_has_managed_allocator (void)
1523 for (i = 0; i < ATYPE_NUM; ++i)
1524 if (alloc_method_cache [i] || slowpath_alloc_method_cache [i])
1530 * Cardtable scanning
1533 #define MWORD_MASK (sizeof (mword) - 1)
1536 find_card_offset (mword card)
1538 /*XXX Use assembly as this generates some pretty bad code */
1539 #if defined(__i386__) && defined(__GNUC__)
1540 return (__builtin_ffs (card) - 1) / 8;
1541 #elif defined(__x86_64__) && defined(__GNUC__)
1542 return (__builtin_ffsll (card) - 1) / 8;
1543 #elif defined(__s390x__)
1544 return (__builtin_ffsll (GUINT64_TO_LE(card)) - 1) / 8;
1547 guint8 *ptr = (guint8 *) &card;
1548 for (i = 0; i < sizeof (mword); ++i) {
1557 find_next_card (guint8 *card_data, guint8 *end)
1559 mword *cards, *cards_end;
1562 while ((((mword)card_data) & MWORD_MASK) && card_data < end) {
1568 if (card_data == end)
1571 cards = (mword*)card_data;
1572 cards_end = (mword*)((mword)end & ~MWORD_MASK);
1573 while (cards < cards_end) {
1576 return (guint8*)cards + find_card_offset (card);
1580 card_data = (guint8*)cards_end;
1581 while (card_data < end) {
1590 #define ARRAY_OBJ_INDEX(ptr,array,elem_size) (((char*)(ptr) - ((char*)(array) + G_STRUCT_OFFSET (MonoArray, vector))) / (elem_size))
1593 sgen_client_cardtable_scan_object (GCObject *obj, mword block_obj_size, guint8 *cards, gboolean mod_union, ScanCopyContext ctx)
1595 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
1596 MonoClass *klass = vt->klass;
1598 SGEN_ASSERT (0, SGEN_VTABLE_HAS_REFERENCES (vt), "Why would we ever call this on reference-free objects?");
1601 MonoArray *arr = (MonoArray*)obj;
1602 guint8 *card_data, *card_base;
1603 guint8 *card_data_end;
1604 char *obj_start = sgen_card_table_align_pointer (obj);
1606 mword obj_size = sgen_mono_array_size (vt, arr, &bounds_size, sgen_vtable_get_descriptor (vt));
1607 /* We don't want to scan the bounds entries at the end of multidimensional arrays */
1608 char *obj_end = (char*)obj + obj_size - bounds_size;
1610 size_t extra_idx = 0;
1612 mword desc = (mword)klass->element_class->gc_descr;
1613 int elem_size = mono_array_element_size (klass);
1615 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1616 guint8 *overflow_scan_end = NULL;
1619 #ifdef SGEN_OBJECT_LAYOUT_STATISTICS
1620 if (klass->element_class->valuetype)
1621 sgen_object_layout_scanned_vtype_array ();
1623 sgen_object_layout_scanned_ref_array ();
1629 card_data = sgen_card_table_get_card_scan_address ((mword)obj);
1631 card_base = card_data;
1632 card_count = sgen_card_table_number_of_cards_in_range ((mword)obj, obj_size);
1633 card_data_end = card_data + card_count;
1636 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1637 /*Check for overflow and if so, setup to scan in two steps*/
1638 if (!cards && card_data_end >= SGEN_SHADOW_CARDTABLE_END) {
1639 overflow_scan_end = sgen_shadow_cardtable + (card_data_end - SGEN_SHADOW_CARDTABLE_END);
1640 card_data_end = SGEN_SHADOW_CARDTABLE_END;
1646 card_data = find_next_card (card_data, card_data_end);
1647 for (; card_data < card_data_end; card_data = find_next_card (card_data + 1, card_data_end)) {
1649 size_t idx = (card_data - card_base) + extra_idx;
1650 char *start = (char*)(obj_start + idx * CARD_SIZE_IN_BYTES);
1651 char *card_end = start + CARD_SIZE_IN_BYTES;
1652 char *first_elem, *elem;
1654 HEAVY_STAT (++los_marked_cards);
1657 sgen_card_table_prepare_card_for_scanning (card_data);
1659 card_end = MIN (card_end, obj_end);
1661 if (start <= (char*)arr->vector)
1664 index = ARRAY_OBJ_INDEX (start, obj, elem_size);
1666 elem = first_elem = (char*)mono_array_addr_with_size_fast ((MonoArray*)obj, elem_size, index);
1667 if (klass->element_class->valuetype) {
1668 ScanVTypeFunc scan_vtype_func = ctx.ops->scan_vtype;
1670 for (; elem < card_end; elem += elem_size)
1671 scan_vtype_func (obj, elem, desc, ctx.queue BINARY_PROTOCOL_ARG (elem_size));
1673 CopyOrMarkObjectFunc copy_func = ctx.ops->copy_or_mark_object;
1675 HEAVY_STAT (++los_array_cards);
1676 for (; elem < card_end; elem += SIZEOF_VOID_P) {
1677 gpointer new, old = *(gpointer*)elem;
1678 if ((mod_union && old) || G_UNLIKELY (sgen_ptr_in_nursery (old))) {
1679 HEAVY_STAT (++los_array_remsets);
1680 copy_func ((GCObject**)elem, ctx.queue);
1681 new = *(gpointer*)elem;
1682 if (G_UNLIKELY (sgen_ptr_in_nursery (new)))
1683 sgen_add_to_global_remset (elem, new);
1688 binary_protocol_card_scan (first_elem, elem - first_elem);
1691 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1692 if (overflow_scan_end) {
1693 extra_idx = card_data - card_base;
1694 card_base = card_data = sgen_shadow_cardtable;
1695 card_data_end = overflow_scan_end;
1696 overflow_scan_end = NULL;
1707 * Array and string allocation
1711 mono_gc_alloc_vector (MonoVTable *vtable, size_t size, uintptr_t max_length)
1716 if (!SGEN_CAN_ALIGN_UP (size))
1719 #ifndef DISABLE_CRITICAL_REGION
1720 ENTER_CRITICAL_REGION;
1721 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1723 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1724 arr->max_length = (mono_array_size_t)max_length;
1725 EXIT_CRITICAL_REGION;
1728 EXIT_CRITICAL_REGION;
1733 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1734 if (G_UNLIKELY (!arr)) {
1736 return mono_gc_out_of_memory (size);
1739 arr->max_length = (mono_array_size_t)max_length;
1744 if (G_UNLIKELY (alloc_events))
1745 mono_profiler_allocation (&arr->obj);
1747 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Vector has incorrect size.");
1752 mono_gc_alloc_array (MonoVTable *vtable, size_t size, uintptr_t max_length, uintptr_t bounds_size)
1755 MonoArrayBounds *bounds;
1758 if (!SGEN_CAN_ALIGN_UP (size))
1761 #ifndef DISABLE_CRITICAL_REGION
1762 ENTER_CRITICAL_REGION;
1763 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1765 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1766 arr->max_length = (mono_array_size_t)max_length;
1768 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1769 arr->bounds = bounds;
1770 EXIT_CRITICAL_REGION;
1773 EXIT_CRITICAL_REGION;
1778 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1779 if (G_UNLIKELY (!arr)) {
1781 return mono_gc_out_of_memory (size);
1784 arr->max_length = (mono_array_size_t)max_length;
1786 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1787 arr->bounds = bounds;
1792 if (G_UNLIKELY (alloc_events))
1793 mono_profiler_allocation (&arr->obj);
1795 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Array has incorrect size.");
1800 mono_gc_alloc_string (MonoVTable *vtable, size_t size, gint32 len)
1805 if (!SGEN_CAN_ALIGN_UP (size))
1808 #ifndef DISABLE_CRITICAL_REGION
1809 ENTER_CRITICAL_REGION;
1810 str = (MonoString*)sgen_try_alloc_obj_nolock (vtable, size);
1812 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1814 EXIT_CRITICAL_REGION;
1817 EXIT_CRITICAL_REGION;
1822 str = (MonoString*)sgen_alloc_obj_nolock (vtable, size);
1823 if (G_UNLIKELY (!str)) {
1825 return mono_gc_out_of_memory (size);
1833 if (G_UNLIKELY (alloc_events))
1834 mono_profiler_allocation (&str->object);
1844 mono_gc_set_string_length (MonoString *str, gint32 new_length)
1846 mono_unichar2 *new_end = str->chars + new_length;
1848 /* zero the discarded string. This null-delimits the string and allows
1849 * the space to be reclaimed by SGen. */
1851 if (nursery_canaries_enabled () && sgen_ptr_in_nursery (str)) {
1852 CHECK_CANARY_FOR_OBJECT ((GCObject*)str, TRUE);
1853 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2) + CANARY_SIZE);
1854 memcpy (new_end + 1 , CANARY_STRING, CANARY_SIZE);
1856 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2));
1859 str->length = new_length;
1866 #define GC_ROOT_NUM 32
1868 int count; /* must be the first field */
1869 void *objects [GC_ROOT_NUM];
1870 int root_types [GC_ROOT_NUM];
1871 uintptr_t extra_info [GC_ROOT_NUM];
1875 notify_gc_roots (GCRootReport *report)
1879 mono_profiler_gc_roots (report->count, report->objects, report->root_types, report->extra_info);
1884 add_profile_gc_root (GCRootReport *report, void *object, int rtype, uintptr_t extra_info)
1886 if (report->count == GC_ROOT_NUM)
1887 notify_gc_roots (report);
1888 report->objects [report->count] = object;
1889 report->root_types [report->count] = rtype;
1890 report->extra_info [report->count++] = (uintptr_t)SGEN_LOAD_VTABLE (object)->klass;
1894 sgen_client_nursery_objects_pinned (void **definitely_pinned, int count)
1896 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS) {
1897 GCRootReport report;
1900 for (idx = 0; idx < count; ++idx)
1901 add_profile_gc_root (&report, definitely_pinned [idx], MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
1902 notify_gc_roots (&report);
1907 report_finalizer_roots_from_queue (SgenPointerQueue *queue)
1909 GCRootReport report;
1913 for (i = 0; i < queue->next_slot; ++i) {
1914 void *obj = queue->data [i];
1917 add_profile_gc_root (&report, obj, MONO_PROFILE_GC_ROOT_FINALIZER, 0);
1919 notify_gc_roots (&report);
1923 report_finalizer_roots (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
1925 report_finalizer_roots_from_queue (fin_ready_queue);
1926 report_finalizer_roots_from_queue (critical_fin_queue);
1929 static GCRootReport *root_report;
1932 single_arg_report_root (MonoObject **obj, void *gc_data)
1935 add_profile_gc_root (root_report, *obj, MONO_PROFILE_GC_ROOT_OTHER, 0);
1939 precisely_report_roots_from (GCRootReport *report, void** start_root, void** end_root, mword desc)
1941 switch (desc & ROOT_DESC_TYPE_MASK) {
1942 case ROOT_DESC_BITMAP:
1943 desc >>= ROOT_DESC_TYPE_SHIFT;
1945 if ((desc & 1) && *start_root) {
1946 add_profile_gc_root (report, *start_root, MONO_PROFILE_GC_ROOT_OTHER, 0);
1952 case ROOT_DESC_COMPLEX: {
1953 gsize *bitmap_data = sgen_get_complex_descriptor_bitmap (desc);
1954 gsize bwords = (*bitmap_data) - 1;
1955 void **start_run = start_root;
1957 while (bwords-- > 0) {
1958 gsize bmap = *bitmap_data++;
1959 void **objptr = start_run;
1961 if ((bmap & 1) && *objptr) {
1962 add_profile_gc_root (report, *objptr, MONO_PROFILE_GC_ROOT_OTHER, 0);
1967 start_run += GC_BITS_PER_WORD;
1971 case ROOT_DESC_USER: {
1972 MonoGCRootMarkFunc marker = (MonoGCRootMarkFunc)sgen_get_user_descriptor_func (desc);
1973 root_report = report;
1974 marker ((MonoObject**)start_root, single_arg_report_root, NULL);
1977 case ROOT_DESC_RUN_LEN:
1978 g_assert_not_reached ();
1980 g_assert_not_reached ();
1985 report_registered_roots_by_type (int root_type)
1987 GCRootReport report;
1991 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], start_root, root) {
1992 SGEN_LOG (6, "Precise root scan %p-%p (desc: %p)", start_root, root->end_root, (void*)root->root_desc);
1993 precisely_report_roots_from (&report, start_root, (void**)root->end_root, root->root_desc);
1994 } SGEN_HASH_TABLE_FOREACH_END;
1995 notify_gc_roots (&report);
1999 report_registered_roots (void)
2001 report_registered_roots_by_type (ROOT_TYPE_NORMAL);
2002 report_registered_roots_by_type (ROOT_TYPE_WBARRIER);
2006 sgen_client_collecting_minor (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2008 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2009 report_registered_roots ();
2010 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2011 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2014 static GCRootReport major_root_report;
2015 static gboolean profile_roots;
2018 sgen_client_collecting_major_1 (void)
2020 profile_roots = mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS;
2021 memset (&major_root_report, 0, sizeof (GCRootReport));
2025 sgen_client_pinned_los_object (GCObject *obj)
2028 add_profile_gc_root (&major_root_report, (char*)obj, MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
2032 sgen_client_collecting_major_2 (void)
2035 notify_gc_roots (&major_root_report);
2037 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2038 report_registered_roots ();
2042 sgen_client_collecting_major_3 (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2044 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2045 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2048 #define MOVED_OBJECTS_NUM 64
2049 static void *moved_objects [MOVED_OBJECTS_NUM];
2050 static int moved_objects_idx = 0;
2053 mono_sgen_register_moved_object (void *obj, void *destination)
2055 g_assert (mono_profiler_events & MONO_PROFILE_GC_MOVES);
2057 if (moved_objects_idx == MOVED_OBJECTS_NUM) {
2058 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2059 moved_objects_idx = 0;
2061 moved_objects [moved_objects_idx++] = obj;
2062 moved_objects [moved_objects_idx++] = destination;
2066 mono_sgen_gc_event_moves (void)
2068 if (moved_objects_idx) {
2069 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2070 moved_objects_idx = 0;
2078 #define REFS_SIZE 128
2081 MonoGCReferences callback;
2085 MonoObject *refs [REFS_SIZE];
2086 uintptr_t offsets [REFS_SIZE];
2090 #define HANDLE_PTR(ptr,obj) do { \
2092 if (hwi->count == REFS_SIZE) { \
2093 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data); \
2097 hwi->offsets [hwi->count] = (char*)(ptr)-(char*)start; \
2098 hwi->refs [hwi->count++] = *(ptr); \
2103 collect_references (HeapWalkInfo *hwi, GCObject *obj, size_t size)
2105 char *start = (char*)obj;
2106 mword desc = sgen_obj_get_descriptor (obj);
2108 #include "sgen/sgen-scan-object.h"
2112 walk_references (GCObject *start, size_t size, void *data)
2114 HeapWalkInfo *hwi = data;
2117 collect_references (hwi, start, size);
2118 if (hwi->count || !hwi->called)
2119 hwi->callback (start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data);
2123 * mono_gc_walk_heap:
2124 * @flags: flags for future use
2125 * @callback: a function pointer called for each object in the heap
2126 * @data: a user data pointer that is passed to callback
2128 * This function can be used to iterate over all the live objects in the heap:
2129 * for each object, @callback is invoked, providing info about the object's
2130 * location in memory, its class, its size and the objects it references.
2131 * For each referenced object it's offset from the object address is
2132 * reported in the offsets array.
2133 * The object references may be buffered, so the callback may be invoked
2134 * multiple times for the same object: in all but the first call, the size
2135 * argument will be zero.
2136 * Note that this function can be only called in the #MONO_GC_EVENT_PRE_START_WORLD
2137 * profiler event handler.
2139 * Returns: a non-zero value if the GC doesn't support heap walking
2142 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
2147 hwi.callback = callback;
2150 sgen_clear_nursery_fragments ();
2151 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data, walk_references, &hwi, FALSE, TRUE);
2153 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, walk_references, &hwi);
2154 sgen_los_iterate_objects (walk_references, &hwi);
2164 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
2166 gc_callbacks = *callbacks;
2170 mono_gc_get_gc_callbacks ()
2172 return &gc_callbacks;
2176 sgen_client_thread_register (SgenThreadInfo* info, void *stack_bottom_fallback)
2179 guint8 *staddr = NULL;
2181 #ifndef HAVE_KW_THREAD
2182 g_assert (!mono_native_tls_get_value (thread_info_key));
2183 mono_native_tls_set_value (thread_info_key, info);
2185 sgen_thread_info = info;
2188 info->client_info.skip = 0;
2189 info->client_info.stopped_ip = NULL;
2190 info->client_info.stopped_domain = NULL;
2192 info->client_info.stack_start = NULL;
2194 #ifdef SGEN_POSIX_STW
2195 info->client_info.stop_count = -1;
2196 info->client_info.signal = 0;
2199 /* On win32, stack_start_limit should be 0, since the stack can grow dynamically */
2200 mono_thread_info_get_stack_bounds (&staddr, &stsize);
2203 info->client_info.stack_start_limit = staddr;
2205 info->client_info.stack_end = staddr + stsize;
2207 gsize stack_bottom = (gsize)stack_bottom_fallback;
2208 stack_bottom += 4095;
2209 stack_bottom &= ~4095;
2210 info->client_info.stack_end = (char*)stack_bottom;
2214 memset (&info->client_info.ctx, 0, sizeof (MonoContext));
2216 memset (&info->client_info.regs, 0, sizeof (info->client_info.regs));
2219 if (mono_gc_get_gc_callbacks ()->thread_attach_func)
2220 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2222 binary_protocol_thread_register ((gpointer)mono_thread_info_get_tid (info));
2224 SGEN_LOG (3, "registered thread %p (%p) stack end %p", info, (gpointer)mono_thread_info_get_tid (info), info->client_info.stack_end);
2228 sgen_client_thread_unregister (SgenThreadInfo *p)
2230 MonoNativeThreadId tid;
2232 #ifndef HAVE_KW_THREAD
2233 mono_native_tls_set_value (thread_info_key, NULL);
2235 sgen_thread_info = NULL;
2238 tid = mono_thread_info_get_tid (p);
2240 if (p->client_info.info.runtime_thread)
2241 mono_threads_add_joinable_thread ((gpointer)tid);
2243 if (mono_gc_get_gc_callbacks ()->thread_detach_func) {
2244 mono_gc_get_gc_callbacks ()->thread_detach_func (p->client_info.runtime_data);
2245 p->client_info.runtime_data = NULL;
2248 binary_protocol_thread_unregister ((gpointer)tid);
2249 SGEN_LOG (3, "unregister thread %p (%p)", p, (gpointer)tid);
2253 mono_gc_set_skip_thread (gboolean skip)
2255 SgenThreadInfo *info = mono_thread_info_current ();
2258 info->client_info.gc_disabled = skip;
2263 is_critical_method (MonoMethod *method)
2265 return mono_runtime_is_critical_method (method) || sgen_is_critical_method (method);
2269 thread_in_critical_region (SgenThreadInfo *info)
2271 return info->client_info.in_critical_region;
2275 sgen_thread_attach (SgenThreadInfo *info)
2277 if (mono_gc_get_gc_callbacks ()->thread_attach_func && !info->client_info.runtime_data)
2278 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2282 sgen_thread_detach (SgenThreadInfo *p)
2284 /* If a delegate is passed to native code and invoked on a thread we dont
2285 * know about, the jit will register it with mono_jit_thread_attach, but
2286 * we have no way of knowing when that thread goes away. SGen has a TSD
2287 * so we assume that if the domain is still registered, we can detach
2290 if (mono_domain_get ())
2291 mono_thread_detach_internal (mono_thread_internal_current ());
2295 mono_gc_register_thread (void *baseptr)
2297 return mono_thread_info_attach (baseptr) != NULL;
2301 mono_gc_is_gc_thread (void)
2305 result = mono_thread_info_current () != NULL;
2311 sgen_client_thread_register_worker (void)
2313 mono_thread_info_register_small_id ();
2316 /* Variables holding start/end nursery so it won't have to be passed at every call */
2317 static void *scan_area_arg_start, *scan_area_arg_end;
2320 mono_gc_conservatively_scan_area (void *start, void *end)
2322 sgen_conservatively_pin_objects_from (start, end, scan_area_arg_start, scan_area_arg_end, PIN_TYPE_STACK);
2326 mono_gc_scan_object (void *obj, void *gc_data)
2328 ScanCopyContext *ctx = gc_data;
2329 ctx->ops->copy_or_mark_object ((GCObject**)&obj, ctx->queue);
2334 * Mark from thread stacks and registers.
2337 sgen_client_scan_thread_data (void *start_nursery, void *end_nursery, gboolean precise, ScanCopyContext ctx)
2339 SgenThreadInfo *info;
2341 scan_area_arg_start = start_nursery;
2342 scan_area_arg_end = end_nursery;
2344 FOREACH_THREAD (info) {
2345 int skip_reason = 0;
2346 void *aligned_stack_start = (void*)(mword) ALIGN_TO ((mword)info->client_info.stack_start, SIZEOF_VOID_P);
2348 if (info->client_info.skip) {
2349 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);
2351 } else if (info->client_info.gc_disabled) {
2352 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);
2354 } else if (!mono_thread_info_is_live (info)) {
2355 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);
2359 binary_protocol_scan_stack ((gpointer)mono_thread_info_get_tid (info), info->client_info.stack_start, info->client_info.stack_end, skip_reason);
2364 g_assert (info->client_info.suspend_done);
2365 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 ());
2366 if (mono_gc_get_gc_callbacks ()->thread_mark_func && !conservative_stack_mark) {
2367 mono_gc_get_gc_callbacks ()->thread_mark_func (info->client_info.runtime_data, aligned_stack_start, info->client_info.stack_end, precise, &ctx);
2368 } else if (!precise) {
2369 if (!conservative_stack_mark) {
2370 fprintf (stderr, "Precise stack mark not supported - disabling.\n");
2371 conservative_stack_mark = TRUE;
2373 sgen_conservatively_pin_objects_from (aligned_stack_start, info->client_info.stack_end, start_nursery, end_nursery, PIN_TYPE_STACK);
2378 sgen_conservatively_pin_objects_from ((void**)&info->client_info.ctx, (void**)&info->client_info.ctx + ARCH_NUM_REGS,
2379 start_nursery, end_nursery, PIN_TYPE_STACK);
2381 sgen_conservatively_pin_objects_from ((void**)&info->client_info.regs, (void**)&info->client_info.regs + ARCH_NUM_REGS,
2382 start_nursery, end_nursery, PIN_TYPE_STACK);
2385 // This is used on Coop GC for platforms where we cannot get the data for individual registers.
2386 // We force a spill of all registers into the stack and pass a chunk of data into sgen.
2387 MonoThreadUnwindState *state = &info->client_info.info.thread_saved_state [SELF_SUSPEND_STATE_INDEX];
2388 if (state && state->gc_stackdata) {
2389 sgen_conservatively_pin_objects_from (state->gc_stackdata, (void**)((char*)state->gc_stackdata + state->gc_stackdata_size),
2390 start_nursery, end_nursery, PIN_TYPE_STACK);
2394 } END_FOREACH_THREAD
2398 * mono_gc_set_stack_end:
2400 * Set the end of the current threads stack to STACK_END. The stack space between
2401 * STACK_END and the real end of the threads stack will not be scanned during collections.
2404 mono_gc_set_stack_end (void *stack_end)
2406 SgenThreadInfo *info;
2409 info = mono_thread_info_current ();
2411 SGEN_ASSERT (0, stack_end < info->client_info.stack_end, "Can only lower stack end");
2412 info->client_info.stack_end = stack_end;
2422 mono_gc_register_root (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2424 return sgen_register_root (start, size, descr, descr ? ROOT_TYPE_NORMAL : ROOT_TYPE_PINNED, source, msg);
2428 mono_gc_register_root_wbarrier (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2430 return sgen_register_root (start, size, descr, ROOT_TYPE_WBARRIER, source, msg);
2434 mono_gc_deregister_root (char* addr)
2436 sgen_deregister_root (addr);
2445 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
2447 return pthread_create (new_thread, attr, start_routine, arg);
2456 sgen_client_total_allocated_heap_changed (size_t allocated_heap)
2458 mono_runtime_resource_check_limit (MONO_RESOURCE_GC_HEAP, allocated_heap);
2462 mono_gc_user_markers_supported (void)
2468 mono_object_is_alive (MonoObject* o)
2474 mono_gc_get_generation (MonoObject *obj)
2476 if (sgen_ptr_in_nursery (obj))
2482 mono_gc_enable_events (void)
2487 mono_gc_get_gc_name (void)
2493 mono_gc_get_description (void)
2495 return g_strdup ("sgen");
2499 mono_gc_set_desktop_mode (void)
2504 mono_gc_is_moving (void)
2510 mono_gc_is_disabled (void)
2516 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
2523 mono_gc_max_generation (void)
2529 mono_gc_precise_stack_mark_enabled (void)
2531 return !conservative_stack_mark;
2535 mono_gc_collect (int generation)
2537 sgen_gc_collect (generation);
2541 mono_gc_collection_count (int generation)
2543 return sgen_gc_collection_count (generation);
2547 mono_gc_get_used_size (void)
2549 return (int64_t)sgen_gc_get_used_size ();
2553 mono_gc_get_heap_size (void)
2555 return (int64_t)sgen_gc_get_total_heap_allocation ();
2559 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
2561 return sgen_make_user_root_descriptor (marker);
2565 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
2567 return SGEN_DESC_STRING;
2571 mono_gc_get_nursery (int *shift_bits, size_t *size)
2573 *size = sgen_nursery_size;
2574 *shift_bits = DEFAULT_NURSERY_BITS;
2575 return sgen_get_nursery_start ();
2579 mono_gc_get_los_limit (void)
2581 return SGEN_MAX_SMALL_OBJ_SIZE;
2585 sgen_client_default_metadata (void)
2587 return mono_domain_get ();
2591 sgen_client_metadata_for_object (GCObject *obj)
2593 return mono_object_domain (obj);
2597 * mono_gchandle_is_in_domain:
2598 * @gchandle: a GCHandle's handle.
2599 * @domain: An application domain.
2601 * Returns: true if the object wrapped by the @gchandle belongs to the specific @domain.
2604 mono_gchandle_is_in_domain (guint32 gchandle, MonoDomain *domain)
2606 MonoDomain *gchandle_domain = sgen_gchandle_get_metadata (gchandle);
2607 return domain->domain_id == gchandle_domain->domain_id;
2611 * mono_gchandle_free_domain:
2612 * @unloading: domain that is unloading
2614 * Function used internally to cleanup any GC handle for objects belonging
2615 * to the specified domain during appdomain unload.
2618 mono_gchandle_free_domain (MonoDomain *unloading)
2623 null_link_if_in_domain (gpointer hidden, GCHandleType handle_type, int max_generation, gpointer user)
2625 MonoDomain *unloading_domain = user;
2626 MonoDomain *obj_domain;
2627 gboolean is_weak = MONO_GC_HANDLE_TYPE_IS_WEAK (handle_type);
2628 if (MONO_GC_HANDLE_IS_OBJECT_POINTER (hidden)) {
2629 MonoObject *obj = MONO_GC_REVEAL_POINTER (hidden, is_weak);
2630 obj_domain = mono_object_domain (obj);
2632 obj_domain = MONO_GC_REVEAL_POINTER (hidden, is_weak);
2634 if (unloading_domain->domain_id == obj_domain->domain_id)
2640 sgen_null_links_for_domain (MonoDomain *domain)
2643 for (type = HANDLE_TYPE_MIN; type < HANDLE_TYPE_MAX; ++type)
2644 sgen_gchandle_iterate (type, GENERATION_OLD, null_link_if_in_domain, domain);
2648 mono_gchandle_set_target (guint32 gchandle, MonoObject *obj)
2650 sgen_gchandle_set_target (gchandle, obj);
2654 sgen_client_gchandle_created (int handle_type, GCObject *obj, guint32 handle)
2656 #ifndef DISABLE_PERFCOUNTERS
2657 mono_perfcounters->gc_num_handles++;
2659 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_CREATED, handle_type, handle, obj);
2663 sgen_client_gchandle_destroyed (int handle_type, guint32 handle)
2665 #ifndef DISABLE_PERFCOUNTERS
2666 mono_perfcounters->gc_num_handles--;
2668 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_DESTROYED, handle_type, handle, NULL);
2672 sgen_client_ensure_weak_gchandles_accessible (void)
2675 * During the second bridge processing step the world is
2676 * running again. That step processes all weak links once
2677 * more to null those that refer to dead objects. Before that
2678 * is completed, those links must not be followed, so we
2679 * conservatively wait for bridge processing when any weak
2680 * link is dereferenced.
2682 /* FIXME: A GC can occur after this check fails, in which case we
2683 * should wait for bridge processing but would fail to do so.
2685 if (G_UNLIKELY (bridge_processing_in_progress))
2686 mono_gc_wait_for_bridge_processing ();
2690 mono_gc_set_allow_synchronous_major (gboolean flag)
2692 return sgen_set_allow_synchronous_major (flag);
2696 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
2700 result = func (data);
2701 UNLOCK_INTERRUPTION;
2706 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
2712 sgen_client_out_of_memory (size_t size)
2714 mono_gc_out_of_memory (size);
2718 mono_gc_get_card_table (int *shift_bits, gpointer *mask)
2720 return sgen_get_card_table_configuration (shift_bits, mask);
2724 mono_gc_card_table_nursery_check (void)
2726 return !sgen_get_major_collector ()->is_concurrent;
2729 /* Negative value to remove */
2731 mono_gc_add_memory_pressure (gint64 value)
2733 /* FIXME: Implement at some point? */
2741 sgen_client_degraded_allocation (size_t size)
2743 static int last_major_gc_warned = -1;
2744 static int num_degraded = 0;
2746 if (last_major_gc_warned < gc_stats.major_gc_count) {
2748 if (num_degraded == 1 || num_degraded == 3)
2749 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Degraded allocation. Consider increasing nursery-size if the warning persists.");
2750 else if (num_degraded == 10)
2751 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Repeated degraded allocation. Consider increasing nursery-size.");
2752 last_major_gc_warned = gc_stats.major_gc_count;
2757 sgen_client_log_timing (GGTimingInfo *info, mword last_major_num_sections, mword last_los_memory_usage)
2759 SgenMajorCollector *major_collector = sgen_get_major_collector ();
2760 mword num_major_sections = major_collector->get_num_major_sections ();
2761 char full_timing_buff [1024];
2762 full_timing_buff [0] = '\0';
2764 if (!info->is_overflow)
2765 sprintf (full_timing_buff, "total %.2fms, bridge %.2fms", info->stw_time / 10000.0f, (int)info->bridge_time / 10000.0f);
2766 if (info->generation == GENERATION_OLD)
2767 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "GC_MAJOR%s: (%s) pause %.2fms, %s major %dK/%dK los %dK/%dK",
2768 info->is_overflow ? "_OVERFLOW" : "",
2769 info->reason ? info->reason : "",
2770 (int)info->total_time / 10000.0f,
2772 major_collector->section_size * num_major_sections / 1024,
2773 major_collector->section_size * last_major_num_sections / 1024,
2774 los_memory_usage / 1024,
2775 last_los_memory_usage / 1024);
2777 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "GC_MINOR%s: (%s) pause %.2fms, %s promoted %dK major %dK los %dK",
2778 info->is_overflow ? "_OVERFLOW" : "",
2779 info->reason ? info->reason : "",
2780 (int)info->total_time / 10000.0f,
2782 (num_major_sections - last_major_num_sections) * major_collector->section_size / 1024,
2783 major_collector->section_size * num_major_sections / 1024,
2784 los_memory_usage / 1024);
2792 sgen_client_description_for_internal_mem_type (int type)
2795 case INTERNAL_MEM_EPHEMERON_LINK: return "ephemeron-link";
2802 sgen_client_pre_collection_checks (void)
2804 if (sgen_mono_xdomain_checks) {
2805 sgen_clear_nursery_fragments ();
2806 sgen_check_for_xdomain_refs ();
2811 sgen_client_vtable_is_inited (MonoVTable *vt)
2813 return vt->klass->inited;
2817 sgen_client_vtable_get_namespace (MonoVTable *vt)
2819 return vt->klass->name_space;
2823 sgen_client_vtable_get_name (MonoVTable *vt)
2825 return vt->klass->name;
2833 sgen_client_init (void)
2836 MonoThreadInfoCallbacks cb;
2838 cb.thread_register = sgen_thread_register;
2839 cb.thread_detach = sgen_thread_detach;
2840 cb.thread_unregister = sgen_thread_unregister;
2841 cb.thread_attach = sgen_thread_attach;
2842 cb.mono_method_is_critical = (gpointer)is_critical_method;
2843 cb.mono_thread_in_critical_region = thread_in_critical_region;
2845 mono_threads_init (&cb, sizeof (SgenThreadInfo));
2847 ///* Keep this the default for now */
2848 /* Precise marking is broken on all supported targets. Disable until fixed. */
2849 conservative_stack_mark = TRUE;
2851 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_EPHEMERON_LINK, sizeof (EphemeronLinkNode));
2853 mono_sgen_init_stw ();
2855 #ifndef HAVE_KW_THREAD
2856 mono_native_tls_alloc (&thread_info_key, NULL);
2857 #if defined(TARGET_OSX) || defined(TARGET_WIN32) || defined(TARGET_ANDROID) || defined(TARGET_IOS)
2859 * CEE_MONO_TLS requires the tls offset, not the key, so the code below only works on darwin,
2860 * where the two are the same.
2862 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO, thread_info_key);
2866 int tls_offset = -1;
2867 MONO_THREAD_VAR_OFFSET (sgen_thread_info, tls_offset);
2868 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO, tls_offset);
2873 * This needs to happen before any internal allocations because
2874 * it inits the small id which is required for hazard pointer
2879 mono_gc_register_thread (&dummy);
2883 sgen_client_handle_gc_param (const char *opt)
2885 if (g_str_has_prefix (opt, "stack-mark=")) {
2886 opt = strchr (opt, '=') + 1;
2887 if (!strcmp (opt, "precise")) {
2888 conservative_stack_mark = FALSE;
2889 } else if (!strcmp (opt, "conservative")) {
2890 conservative_stack_mark = TRUE;
2892 sgen_env_var_error (MONO_GC_PARAMS_NAME, conservative_stack_mark ? "Using `conservative`." : "Using `precise`.",
2893 "Invalid value `%s` for `stack-mark` option, possible values are: `precise`, `conservative`.", opt);
2895 } else if (g_str_has_prefix (opt, "bridge-implementation=")) {
2896 opt = strchr (opt, '=') + 1;
2897 sgen_set_bridge_implementation (opt);
2898 } else if (g_str_has_prefix (opt, "toggleref-test")) {
2899 /* FIXME: This should probably in MONO_GC_DEBUG */
2900 sgen_register_test_toggleref_callback ();
2908 sgen_client_print_gc_params_usage (void)
2910 fprintf (stderr, " stack-mark=MARK-METHOD (where MARK-METHOD is 'precise' or 'conservative')\n");
2914 sgen_client_handle_gc_debug (const char *opt)
2916 if (!strcmp (opt, "xdomain-checks")) {
2917 sgen_mono_xdomain_checks = TRUE;
2918 } else if (!strcmp (opt, "do-not-finalize")) {
2919 mono_do_not_finalize = TRUE;
2920 } else if (g_str_has_prefix (opt, "do-not-finalize=")) {
2921 opt = strchr (opt, '=') + 1;
2922 mono_do_not_finalize = TRUE;
2923 mono_do_not_finalize_class_names = g_strsplit (opt, ",", 0);
2924 } else if (!strcmp (opt, "log-finalizers")) {
2925 log_finalizers = TRUE;
2926 } else if (!strcmp (opt, "no-managed-allocator")) {
2927 sgen_set_use_managed_allocator (FALSE);
2928 } else if (!sgen_bridge_handle_gc_debug (opt)) {
2935 sgen_client_print_gc_debug_usage (void)
2937 fprintf (stderr, " xdomain-checks\n");
2938 fprintf (stderr, " do-not-finalize\n");
2939 fprintf (stderr, " log-finalizers\n");
2940 fprintf (stderr, " no-managed-allocator\n");
2941 sgen_bridge_print_gc_debug_usage ();
2946 sgen_client_get_provenance (void)
2948 #ifdef SGEN_OBJECT_PROVENANCE
2949 MonoGCCallbacks *cb = mono_gc_get_gc_callbacks ();
2950 gpointer (*get_provenance_func) (void);
2953 get_provenance_func = cb->get_provenance_func;
2954 if (get_provenance_func)
2955 return get_provenance_func ();
2963 sgen_client_describe_invalid_pointer (GCObject *ptr)
2965 sgen_bridge_describe_pointer (ptr);
2969 mono_gc_base_init (void)
2971 mono_counters_init ();
2973 #ifdef HEAVY_STATISTICS
2974 mono_counters_register ("los marked cards", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_marked_cards);
2975 mono_counters_register ("los array cards scanned ", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_cards);
2976 mono_counters_register ("los array remsets", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_remsets);
2978 mono_counters_register ("WBarrier set arrayref", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_set_arrayref);
2979 mono_counters_register ("WBarrier value copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_value_copy);
2980 mono_counters_register ("WBarrier object copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_object_copy);
2985 if (nursery_canaries_enabled ())
2986 sgen_set_use_managed_allocator (FALSE);
2990 mono_gc_base_cleanup (void)
2995 mono_gc_is_null (void)