2 * sgen-mono.c: SGen features specific to Mono.
4 * Copyright (C) 2014 Xamarin Inc
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License 2.0 as published by the Free Software Foundation;
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
15 * You should have received a copy of the GNU Library General Public
16 * License 2.0 along with this library; if not, write to the Free
17 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 #include "sgen/sgen-gc.h"
24 #include "sgen/sgen-protocol.h"
25 #include "metadata/monitor.h"
26 #include "sgen/sgen-layout-stats.h"
27 #include "sgen/sgen-client.h"
28 #include "sgen/sgen-cardtable.h"
29 #include "sgen/sgen-pinning.h"
30 #include "metadata/marshal.h"
31 #include "metadata/method-builder.h"
32 #include "metadata/abi-details.h"
33 #include "metadata/mono-gc.h"
34 #include "metadata/runtime.h"
35 #include "metadata/sgen-bridge-internals.h"
36 #include "metadata/gc-internals.h"
37 #include "metadata/handle.h"
38 #include "utils/mono-memory-model.h"
39 #include "utils/mono-logger-internals.h"
40 #include "sgen/sgen-thread-pool.h"
42 #ifdef HEAVY_STATISTICS
43 static guint64 stat_wbarrier_set_arrayref = 0;
44 static guint64 stat_wbarrier_value_copy = 0;
45 static guint64 stat_wbarrier_object_copy = 0;
47 static guint64 los_marked_cards;
48 static guint64 los_array_cards;
49 static guint64 los_array_remsets;
52 /* If set, mark stacks conservatively, even if precise marking is possible */
53 static gboolean conservative_stack_mark = FALSE;
54 /* If set, check that there are no references to the domain left at domain unload */
55 gboolean sgen_mono_xdomain_checks = FALSE;
57 /* Functions supplied by the runtime to be called by the GC */
58 static MonoGCCallbacks gc_callbacks;
61 __thread SgenThreadInfo *sgen_thread_info;
63 MonoNativeTlsKey thread_info_key;
66 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
68 #define OPDEF(a,b,c,d,e,f,g,h,i,j) \
72 #include "mono/cil/opcode.def"
83 ptr_on_stack (void *ptr)
85 gpointer stack_start = &stack_start;
86 SgenThreadInfo *info = mono_thread_info_current ();
88 if (ptr >= stack_start && ptr < (gpointer)info->client_info.stack_end)
93 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
95 #define HANDLE_PTR(ptr,obj) do { \
96 gpointer o = *(gpointer*)(ptr); \
98 gpointer d = ((char*)dest) + ((char*)(ptr) - (char*)(obj)); \
99 binary_protocol_wbarrier (d, o, (gpointer) SGEN_LOAD_VTABLE (o)); \
104 scan_object_for_binary_protocol_copy_wbarrier (gpointer dest, char *start, mword desc)
106 #define SCAN_OBJECT_NOVTABLE
107 #include "sgen/sgen-scan-object.h"
112 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
114 HEAVY_STAT (++stat_wbarrier_value_copy);
115 g_assert (klass->valuetype);
117 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);
119 if (sgen_ptr_in_nursery (dest) || ptr_on_stack (dest) || !sgen_gc_descr_has_references ((mword)klass->gc_descr)) {
120 size_t element_size = mono_class_value_size (klass, NULL);
121 size_t size = count * element_size;
122 mono_gc_memmove_atomic (dest, src, size);
126 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
127 if (binary_protocol_is_heavy_enabled ()) {
128 size_t element_size = mono_class_value_size (klass, NULL);
130 for (i = 0; i < count; ++i) {
131 scan_object_for_binary_protocol_copy_wbarrier ((char*)dest + i * element_size,
132 (char*)src + i * element_size - sizeof (MonoObject),
133 (mword) klass->gc_descr);
138 sgen_get_remset ()->wbarrier_value_copy (dest, src, count, mono_class_value_size (klass, NULL));
142 * mono_gc_wbarrier_object_copy:
144 * Write barrier to call when obj is the result of a clone or copy of an object.
147 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
151 HEAVY_STAT (++stat_wbarrier_object_copy);
153 if (sgen_ptr_in_nursery (obj) || ptr_on_stack (obj) || !SGEN_OBJECT_HAS_REFERENCES (src)) {
154 size = mono_object_class (obj)->instance_size;
155 mono_gc_memmove_aligned ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
156 size - sizeof (MonoObject));
160 #ifdef SGEN_HEAVY_BINARY_PROTOCOL
161 if (binary_protocol_is_heavy_enabled ())
162 scan_object_for_binary_protocol_copy_wbarrier (obj, (char*)src, (mword) src->vtable->gc_descr);
165 sgen_get_remset ()->wbarrier_object_copy (obj, src);
169 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
171 HEAVY_STAT (++stat_wbarrier_set_arrayref);
172 if (sgen_ptr_in_nursery (slot_ptr)) {
173 *(void**)slot_ptr = value;
176 SGEN_LOG (8, "Adding remset at %p", slot_ptr);
178 binary_protocol_wbarrier (slot_ptr, value, value->vtable);
180 sgen_get_remset ()->wbarrier_set_field ((GCObject*)arr, slot_ptr, value);
184 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
186 mono_gc_wbarrier_set_arrayref ((MonoArray*)obj, field_ptr, value);
190 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
192 sgen_wbarrier_value_copy_bitmap (_dest, _src, size, bitmap);
195 static MonoMethod *write_barrier_conc_method;
196 static MonoMethod *write_barrier_noconc_method;
199 sgen_is_critical_method (MonoMethod *method)
201 return (method == write_barrier_conc_method || method == write_barrier_noconc_method || sgen_is_managed_allocator (method));
205 sgen_has_critical_method (void)
207 return write_barrier_conc_method || write_barrier_noconc_method || sgen_has_managed_allocator ();
213 emit_nursery_check (MonoMethodBuilder *mb, int *nursery_check_return_labels, gboolean is_concurrent)
215 int shifted_nursery_start = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
217 memset (nursery_check_return_labels, 0, sizeof (int) * 2);
218 // if (ptr_in_nursery (ptr)) return;
220 * Masking out the bits might be faster, but we would have to use 64 bit
221 * immediates, which might be slower.
223 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
224 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_START);
225 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
226 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
227 mono_mb_emit_byte (mb, CEE_SHR_UN);
228 mono_mb_emit_stloc (mb, shifted_nursery_start);
230 mono_mb_emit_ldarg (mb, 0);
231 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
232 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
233 mono_mb_emit_byte (mb, CEE_SHR_UN);
234 mono_mb_emit_ldloc (mb, shifted_nursery_start);
235 nursery_check_return_labels [0] = mono_mb_emit_branch (mb, CEE_BEQ);
237 if (!is_concurrent) {
238 // if (!ptr_in_nursery (*ptr)) return;
239 mono_mb_emit_ldarg (mb, 0);
240 mono_mb_emit_byte (mb, CEE_LDIND_I);
241 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
242 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_NURSERY_BITS);
243 mono_mb_emit_byte (mb, CEE_SHR_UN);
244 mono_mb_emit_ldloc (mb, shifted_nursery_start);
245 nursery_check_return_labels [1] = mono_mb_emit_branch (mb, CEE_BNE_UN);
251 mono_gc_get_specific_write_barrier (gboolean is_concurrent)
254 MonoMethodBuilder *mb;
255 MonoMethodSignature *sig;
256 MonoMethod **write_barrier_method_addr;
258 #ifdef MANAGED_WBARRIER
259 int i, nursery_check_labels [2];
262 // FIXME: Maybe create a separate version for ctors (the branch would be
263 // correctly predicted more times)
265 write_barrier_method_addr = &write_barrier_conc_method;
267 write_barrier_method_addr = &write_barrier_noconc_method;
269 if (*write_barrier_method_addr)
270 return *write_barrier_method_addr;
272 /* Create the IL version of mono_gc_barrier_generic_store () */
273 sig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
274 sig->ret = &mono_defaults.void_class->byval_arg;
275 sig->params [0] = &mono_defaults.int_class->byval_arg;
278 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_conc", MONO_WRAPPER_WRITE_BARRIER);
280 mb = mono_mb_new (mono_defaults.object_class, "wbarrier_noconc", MONO_WRAPPER_WRITE_BARRIER);
283 #ifdef MANAGED_WBARRIER
284 emit_nursery_check (mb, nursery_check_labels, is_concurrent);
286 addr = sgen_cardtable + ((address >> CARD_BITS) & CARD_MASK)
290 LDC_PTR sgen_cardtable
296 if (SGEN_HAVE_OVERLAPPING_CARDS) {
297 LDC_PTR card_table_mask
304 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
305 mono_mb_emit_byte (mb, CEE_MONO_LDPTR_CARD_TABLE);
306 mono_mb_emit_ldarg (mb, 0);
307 mono_mb_emit_icon (mb, CARD_BITS);
308 mono_mb_emit_byte (mb, CEE_SHR_UN);
309 mono_mb_emit_byte (mb, CEE_CONV_I);
310 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
311 #if SIZEOF_VOID_P == 8
312 mono_mb_emit_icon8 (mb, CARD_MASK);
314 mono_mb_emit_icon (mb, CARD_MASK);
316 mono_mb_emit_byte (mb, CEE_CONV_I);
317 mono_mb_emit_byte (mb, CEE_AND);
319 mono_mb_emit_byte (mb, CEE_ADD);
320 mono_mb_emit_icon (mb, 1);
321 mono_mb_emit_byte (mb, CEE_STIND_I1);
324 for (i = 0; i < 2; ++i) {
325 if (nursery_check_labels [i])
326 mono_mb_patch_branch (mb, nursery_check_labels [i]);
328 mono_mb_emit_byte (mb, CEE_RET);
330 mono_mb_emit_ldarg (mb, 0);
331 mono_mb_emit_icall (mb, mono_gc_wbarrier_generic_nostore);
332 mono_mb_emit_byte (mb, CEE_RET);
335 res = mono_mb_create_method (mb, sig, 16);
336 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
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 = MONO_SIZEOF_MONO_ARRAY;
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 < MONO_SIZEOF_MONO_ARRAY) {
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 = (MonoThreadsSync *)GINT_TO_POINTER (-1);
410 o->max_length = (mono_array_size_t)(size - MONO_SIZEOF_MONO_ARRAY);
416 sgen_client_zero_array_fill_header (void *p, size_t size)
418 if (size >= MONO_SIZEOF_MONO_ARRAY) {
419 memset (p, 0, MONO_SIZEOF_MONO_ARRAY);
421 static guint8 zeros [MONO_SIZEOF_MONO_ARRAY];
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 *klass)
437 /* FIXME move this to the bridge code */
438 if (sgen_need_bridge_processing ()) {
439 switch (sgen_bridge_class_kind (klass)) {
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 (klass))
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 = (MonoDomain *)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 = (EphemeronLinkNode *)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)) {
942 mono_profiler_allocation (obj);
949 mono_gc_alloc_pinned_obj (MonoVTable *vtable, size_t size)
951 MonoObject *obj = sgen_alloc_obj_pinned (vtable, size);
953 if (G_UNLIKELY (alloc_events)) {
955 mono_profiler_allocation (obj);
962 mono_gc_alloc_mature (MonoVTable *vtable, size_t size)
964 MonoObject *obj = sgen_alloc_obj_mature (vtable, size);
966 if (G_UNLIKELY (alloc_events)) {
968 mono_profiler_allocation (obj);
975 mono_gc_alloc_fixed (size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
977 /* FIXME: do a single allocation */
978 void *res = calloc (1, size);
981 if (!mono_gc_register_root ((char *)res, size, descr, source, msg)) {
989 mono_gc_free_fixed (void* addr)
991 mono_gc_deregister_root ((char *)addr);
999 static MonoMethod* alloc_method_cache [ATYPE_NUM];
1000 static MonoMethod* slowpath_alloc_method_cache [ATYPE_NUM];
1001 static gboolean use_managed_allocator = TRUE;
1003 #ifdef MANAGED_ALLOCATION
1005 #ifdef HAVE_KW_THREAD
1007 #define EMIT_TLS_ACCESS_NEXT_ADDR(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_NEXT_ADDR); \
1013 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { \
1014 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1015 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1016 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_TLAB_TEMP_END); \
1021 #if defined(TARGET_OSX) || defined(TARGET_WIN32) || defined(TARGET_ANDROID) || defined(TARGET_IOS)
1022 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { \
1023 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1024 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1025 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1026 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_next_addr)); \
1027 mono_mb_emit_byte ((mb), CEE_ADD); \
1028 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1031 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { \
1032 mono_mb_emit_byte ((mb), MONO_CUSTOM_PREFIX); \
1033 mono_mb_emit_byte ((mb), CEE_MONO_TLS); \
1034 mono_mb_emit_i4 ((mb), TLS_KEY_SGEN_THREAD_INFO); \
1035 mono_mb_emit_icon ((mb), MONO_STRUCT_OFFSET (SgenThreadInfo, tlab_temp_end)); \
1036 mono_mb_emit_byte ((mb), CEE_ADD); \
1037 mono_mb_emit_byte ((mb), CEE_LDIND_I); \
1041 #define EMIT_TLS_ACCESS_NEXT_ADDR(mb) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1042 #define EMIT_TLS_ACCESS_TEMP_END(mb) do { g_error ("sgen is not supported when using --with-tls=pthread.\n"); } while (0)
1047 /* FIXME: Do this in the JIT, where specialized allocation sequences can be created
1048 * for each class. This is currently not easy to do, as it is hard to generate basic
1049 * blocks + branches, but it is easy with the linear IL codebase.
1051 * For this to work we'd need to solve the TLAB race, first. Now we
1052 * require the allocator to be in a few known methods to make sure
1053 * that they are executed atomically via the restart mechanism.
1056 create_allocator (int atype, gboolean slowpath)
1058 int p_var, size_var;
1059 guint32 slowpath_branch, max_size_branch;
1060 MonoMethodBuilder *mb;
1062 MonoMethodSignature *csig;
1063 static gboolean registered = FALSE;
1064 int tlab_next_addr_var, new_next_var;
1065 const char *name = NULL;
1070 mono_register_jit_icall (mono_gc_alloc_obj, "mono_gc_alloc_obj", mono_create_icall_signature ("object ptr int"), FALSE);
1071 mono_register_jit_icall (mono_gc_alloc_vector, "mono_gc_alloc_vector", mono_create_icall_signature ("object ptr int int"), FALSE);
1072 mono_register_jit_icall (mono_gc_alloc_string, "mono_gc_alloc_string", mono_create_icall_signature ("object ptr int int32"), FALSE);
1076 if (atype == ATYPE_SMALL) {
1077 name = slowpath ? "SlowAllocSmall" : "AllocSmall";
1078 } else if (atype == ATYPE_NORMAL) {
1079 name = slowpath ? "SlowAlloc" : "Alloc";
1080 } else if (atype == ATYPE_VECTOR) {
1081 name = slowpath ? "SlowAllocVector" : "AllocVector";
1082 } else if (atype == ATYPE_STRING) {
1083 name = slowpath ? "SlowAllocString" : "AllocString";
1085 g_assert_not_reached ();
1088 if (atype == ATYPE_NORMAL)
1093 csig = mono_metadata_signature_alloc (mono_defaults.corlib, num_params);
1094 if (atype == ATYPE_STRING) {
1095 csig->ret = &mono_defaults.string_class->byval_arg;
1096 csig->params [0] = &mono_defaults.int_class->byval_arg;
1097 csig->params [1] = &mono_defaults.int32_class->byval_arg;
1099 csig->ret = &mono_defaults.object_class->byval_arg;
1100 for (i = 0; i < num_params; i++)
1101 csig->params [i] = &mono_defaults.int_class->byval_arg;
1104 mb = mono_mb_new (mono_defaults.object_class, name, MONO_WRAPPER_ALLOC);
1111 mono_mb_emit_ldarg (mb, 0);
1112 mono_mb_emit_icall (mb, ves_icall_object_new_specific);
1115 mono_mb_emit_ldarg (mb, 0);
1116 mono_mb_emit_ldarg (mb, 1);
1117 mono_mb_emit_icall (mb, ves_icall_array_new_specific);
1120 mono_mb_emit_ldarg (mb, 1);
1121 mono_mb_emit_icall (mb, ves_icall_string_alloc);
1124 g_assert_not_reached ();
1130 size_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1131 if (atype == ATYPE_SMALL) {
1132 /* size_var = size_arg */
1133 mono_mb_emit_ldarg (mb, 1);
1134 mono_mb_emit_stloc (mb, size_var);
1135 } else if (atype == ATYPE_NORMAL) {
1136 /* size = vtable->klass->instance_size; */
1137 mono_mb_emit_ldarg (mb, 0);
1138 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1139 mono_mb_emit_byte (mb, CEE_ADD);
1140 mono_mb_emit_byte (mb, CEE_LDIND_I);
1141 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, instance_size));
1142 mono_mb_emit_byte (mb, CEE_ADD);
1143 /* FIXME: assert instance_size stays a 4 byte integer */
1144 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1145 mono_mb_emit_byte (mb, CEE_CONV_I);
1146 mono_mb_emit_stloc (mb, size_var);
1147 } else if (atype == ATYPE_VECTOR) {
1148 MonoExceptionClause *clause;
1149 int pos, pos_leave, pos_error;
1150 MonoClass *oom_exc_class;
1154 * n > MONO_ARRAY_MAX_INDEX => OutOfMemoryException
1155 * n < 0 => OverflowException
1157 * We can do an unsigned comparison to catch both cases, then in the error
1158 * case compare signed to distinguish between them.
1160 mono_mb_emit_ldarg (mb, 1);
1161 mono_mb_emit_icon (mb, MONO_ARRAY_MAX_INDEX);
1162 mono_mb_emit_byte (mb, CEE_CONV_U);
1163 pos = mono_mb_emit_short_branch (mb, CEE_BLE_UN_S);
1165 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1166 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1167 mono_mb_emit_ldarg (mb, 1);
1168 mono_mb_emit_icon (mb, 0);
1169 pos_error = mono_mb_emit_short_branch (mb, CEE_BLT_S);
1170 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1171 mono_mb_patch_short_branch (mb, pos_error);
1172 mono_mb_emit_exception (mb, "OverflowException", NULL);
1174 mono_mb_patch_short_branch (mb, pos);
1176 clause = (MonoExceptionClause *)mono_image_alloc0 (mono_defaults.corlib, sizeof (MonoExceptionClause));
1177 clause->try_offset = mono_mb_get_label (mb);
1179 /* vtable->klass->sizes.element_size */
1180 mono_mb_emit_ldarg (mb, 0);
1181 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoVTable, klass));
1182 mono_mb_emit_byte (mb, CEE_ADD);
1183 mono_mb_emit_byte (mb, CEE_LDIND_I);
1184 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoClass, sizes));
1185 mono_mb_emit_byte (mb, CEE_ADD);
1186 mono_mb_emit_byte (mb, CEE_LDIND_U4);
1187 mono_mb_emit_byte (mb, CEE_CONV_I);
1190 mono_mb_emit_ldarg (mb, 1);
1191 mono_mb_emit_byte (mb, CEE_MUL_OVF_UN);
1192 /* + sizeof (MonoArray) */
1193 mono_mb_emit_icon (mb, MONO_SIZEOF_MONO_ARRAY);
1194 mono_mb_emit_byte (mb, CEE_ADD_OVF_UN);
1195 mono_mb_emit_stloc (mb, size_var);
1197 pos_leave = mono_mb_emit_branch (mb, CEE_LEAVE);
1200 clause->flags = MONO_EXCEPTION_CLAUSE_NONE;
1201 clause->try_len = mono_mb_get_pos (mb) - clause->try_offset;
1202 clause->data.catch_class = mono_class_load_from_name (mono_defaults.corlib,
1203 "System", "OverflowException");
1204 clause->handler_offset = mono_mb_get_label (mb);
1206 oom_exc_class = mono_class_load_from_name (mono_defaults.corlib,
1207 "System", "OutOfMemoryException");
1208 ctor = mono_class_get_method_from_name (oom_exc_class, ".ctor", 0);
1211 mono_mb_emit_byte (mb, CEE_POP);
1212 mono_mb_emit_op (mb, CEE_NEWOBJ, ctor);
1213 mono_mb_emit_byte (mb, CEE_THROW);
1215 clause->handler_len = mono_mb_get_pos (mb) - clause->handler_offset;
1216 mono_mb_set_clauses (mb, 1, clause);
1217 mono_mb_patch_branch (mb, pos_leave);
1219 } else if (atype == ATYPE_STRING) {
1223 * a string allocator method takes the args: (vtable, len)
1225 * bytes = offsetof (MonoString, chars) + ((len + 1) * 2)
1229 * bytes <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1233 * offsetof (MonoString, chars) + ((len + 1) * 2) <= INT32_MAX - (SGEN_ALLOC_ALIGN - 1)
1234 * len <= (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - offsetof (MonoString, chars)) / 2 - 1
1236 mono_mb_emit_ldarg (mb, 1);
1237 mono_mb_emit_icon (mb, (INT32_MAX - (SGEN_ALLOC_ALIGN - 1) - MONO_STRUCT_OFFSET (MonoString, chars)) / 2 - 1);
1238 pos = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
1240 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1241 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1242 mono_mb_emit_exception (mb, "OutOfMemoryException", NULL);
1243 mono_mb_patch_short_branch (mb, pos);
1245 mono_mb_emit_ldarg (mb, 1);
1246 mono_mb_emit_icon (mb, 1);
1247 mono_mb_emit_byte (mb, MONO_CEE_SHL);
1248 //WE manually fold the above + 2 here
1249 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, chars) + 2);
1250 mono_mb_emit_byte (mb, CEE_ADD);
1251 mono_mb_emit_stloc (mb, size_var);
1253 g_assert_not_reached ();
1256 if (atype != ATYPE_SMALL) {
1257 /* size += ALLOC_ALIGN - 1; */
1258 mono_mb_emit_ldloc (mb, size_var);
1259 mono_mb_emit_icon (mb, SGEN_ALLOC_ALIGN - 1);
1260 mono_mb_emit_byte (mb, CEE_ADD);
1261 /* size &= ~(ALLOC_ALIGN - 1); */
1262 mono_mb_emit_icon (mb, ~(SGEN_ALLOC_ALIGN - 1));
1263 mono_mb_emit_byte (mb, CEE_AND);
1264 mono_mb_emit_stloc (mb, size_var);
1267 /* if (size > MAX_SMALL_OBJ_SIZE) goto slowpath */
1268 if (atype != ATYPE_SMALL) {
1269 mono_mb_emit_ldloc (mb, size_var);
1270 mono_mb_emit_icon (mb, SGEN_MAX_SMALL_OBJ_SIZE);
1271 max_size_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
1275 * We need to modify tlab_next, but the JIT only supports reading, so we read
1276 * another tls var holding its address instead.
1279 /* tlab_next_addr (local) = tlab_next_addr (TLS var) */
1280 tlab_next_addr_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1281 EMIT_TLS_ACCESS_NEXT_ADDR (mb);
1282 mono_mb_emit_stloc (mb, tlab_next_addr_var);
1284 /* p = (void**)tlab_next; */
1285 p_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1286 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1287 mono_mb_emit_byte (mb, CEE_LDIND_I);
1288 mono_mb_emit_stloc (mb, p_var);
1290 /* new_next = (char*)p + size; */
1291 new_next_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
1292 mono_mb_emit_ldloc (mb, p_var);
1293 mono_mb_emit_ldloc (mb, size_var);
1294 mono_mb_emit_byte (mb, CEE_CONV_I);
1295 mono_mb_emit_byte (mb, CEE_ADD);
1296 mono_mb_emit_stloc (mb, new_next_var);
1298 /* if (G_LIKELY (new_next < tlab_temp_end)) */
1299 mono_mb_emit_ldloc (mb, new_next_var);
1300 EMIT_TLS_ACCESS_TEMP_END (mb);
1301 slowpath_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
1304 if (atype != ATYPE_SMALL)
1305 mono_mb_patch_short_branch (mb, max_size_branch);
1307 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1308 mono_mb_emit_byte (mb, CEE_MONO_NOT_TAKEN);
1310 /* FIXME: mono_gc_alloc_obj takes a 'size_t' as an argument, not an int32 */
1311 mono_mb_emit_ldarg (mb, 0);
1312 mono_mb_emit_ldloc (mb, size_var);
1313 if (atype == ATYPE_NORMAL || atype == ATYPE_SMALL) {
1314 mono_mb_emit_icall (mb, mono_gc_alloc_obj);
1315 } else if (atype == ATYPE_VECTOR) {
1316 mono_mb_emit_ldarg (mb, 1);
1317 mono_mb_emit_icall (mb, mono_gc_alloc_vector);
1318 } else if (atype == ATYPE_STRING) {
1319 mono_mb_emit_ldarg (mb, 1);
1320 mono_mb_emit_icall (mb, mono_gc_alloc_string);
1322 g_assert_not_reached ();
1324 mono_mb_emit_byte (mb, CEE_RET);
1327 mono_mb_patch_short_branch (mb, slowpath_branch);
1329 /* FIXME: Memory barrier */
1331 /* tlab_next = new_next */
1332 mono_mb_emit_ldloc (mb, tlab_next_addr_var);
1333 mono_mb_emit_ldloc (mb, new_next_var);
1334 mono_mb_emit_byte (mb, CEE_STIND_I);
1336 /*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. */
1337 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1338 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1339 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1342 mono_mb_emit_ldloc (mb, p_var);
1343 mono_mb_emit_ldarg (mb, 0);
1344 mono_mb_emit_byte (mb, CEE_STIND_I);
1346 if (atype == ATYPE_VECTOR) {
1347 /* arr->max_length = max_length; */
1348 mono_mb_emit_ldloc (mb, p_var);
1349 mono_mb_emit_ldflda (mb, MONO_STRUCT_OFFSET (MonoArray, max_length));
1350 mono_mb_emit_ldarg (mb, 1);
1351 #ifdef MONO_BIG_ARRAYS
1352 mono_mb_emit_byte (mb, CEE_STIND_I);
1354 mono_mb_emit_byte (mb, CEE_STIND_I4);
1356 } else if (atype == ATYPE_STRING) {
1357 /* need to set length and clear the last char */
1358 /* s->length = len; */
1359 mono_mb_emit_ldloc (mb, p_var);
1360 mono_mb_emit_icon (mb, MONO_STRUCT_OFFSET (MonoString, length));
1361 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1362 mono_mb_emit_ldarg (mb, 1);
1363 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
1364 /* s->chars [len] = 0; */
1365 mono_mb_emit_ldloc (mb, p_var);
1366 mono_mb_emit_ldloc (mb, size_var);
1367 mono_mb_emit_icon (mb, 2);
1368 mono_mb_emit_byte (mb, MONO_CEE_SUB);
1369 mono_mb_emit_byte (mb, MONO_CEE_ADD);
1370 mono_mb_emit_icon (mb, 0);
1371 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
1375 We must make sure both vtable and max_length are globaly visible before returning to managed land.
1377 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
1378 mono_mb_emit_byte (mb, CEE_MONO_MEMORY_BARRIER);
1379 mono_mb_emit_i4 (mb, MONO_MEMORY_BARRIER_REL);
1382 mono_mb_emit_ldloc (mb, p_var);
1385 mono_mb_emit_byte (mb, CEE_RET);
1388 info = mono_wrapper_info_create (mb, WRAPPER_SUBTYPE_NONE);
1389 info->d.alloc.gc_name = "sgen";
1390 info->d.alloc.alloc_type = atype;
1393 mb->init_locals = FALSE;
1396 res = mono_mb_create (mb, csig, 8, info);
1405 mono_gc_get_aligned_size_for_allocator (int size)
1407 return SGEN_ALIGN_UP (size);
1411 * Generate an allocator method implementing the fast path of mono_gc_alloc_obj ().
1412 * The signature of the called method is:
1413 * object allocate (MonoVTable *vtable)
1416 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box, gboolean known_instance_size)
1418 #ifdef MANAGED_ALLOCATION
1419 if (collect_before_allocs)
1421 if (!mono_runtime_has_tls_get ())
1423 if (klass->instance_size > tlab_size)
1425 if (known_instance_size && ALIGN_TO (klass->instance_size, SGEN_ALLOC_ALIGN) >= SGEN_MAX_SMALL_OBJ_SIZE)
1427 if (mono_class_has_finalizer (klass) || mono_class_is_marshalbyref (klass) || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
1431 if (klass->byval_arg.type == MONO_TYPE_STRING)
1432 return mono_gc_get_managed_allocator_by_type (ATYPE_STRING, FALSE);
1433 /* Generic classes have dynamic field and can go above MAX_SMALL_OBJ_SIZE. */
1434 if (known_instance_size)
1435 return mono_gc_get_managed_allocator_by_type (ATYPE_SMALL, FALSE);
1437 return mono_gc_get_managed_allocator_by_type (ATYPE_NORMAL, FALSE);
1444 mono_gc_get_managed_array_allocator (MonoClass *klass)
1446 #ifdef MANAGED_ALLOCATION
1447 if (klass->rank != 1)
1449 if (!mono_runtime_has_tls_get ())
1451 if (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS)
1453 if (has_per_allocation_action)
1455 g_assert (!mono_class_has_finalizer (klass) && !mono_class_is_marshalbyref (klass));
1457 return mono_gc_get_managed_allocator_by_type (ATYPE_VECTOR, FALSE);
1464 sgen_set_use_managed_allocator (gboolean flag)
1466 use_managed_allocator = flag;
1470 mono_gc_get_managed_allocator_by_type (int atype, gboolean slowpath)
1472 #ifdef MANAGED_ALLOCATION
1474 MonoMethod **cache = slowpath ? slowpath_alloc_method_cache : alloc_method_cache;
1476 if (!use_managed_allocator)
1479 if (!mono_runtime_has_tls_get ())
1482 res = cache [atype];
1486 res = create_allocator (atype, slowpath);
1488 if (cache [atype]) {
1489 mono_free_method (res);
1490 res = cache [atype];
1492 mono_memory_barrier ();
1493 cache [atype] = res;
1504 mono_gc_get_managed_allocator_types (void)
1510 sgen_is_managed_allocator (MonoMethod *method)
1514 for (i = 0; i < ATYPE_NUM; ++i)
1515 if (method == alloc_method_cache [i] || method == slowpath_alloc_method_cache [i])
1521 sgen_has_managed_allocator (void)
1525 for (i = 0; i < ATYPE_NUM; ++i)
1526 if (alloc_method_cache [i] || slowpath_alloc_method_cache [i])
1532 * Cardtable scanning
1535 #define MWORD_MASK (sizeof (mword) - 1)
1538 find_card_offset (mword card)
1540 /*XXX Use assembly as this generates some pretty bad code */
1541 #if defined(__i386__) && defined(__GNUC__)
1542 return (__builtin_ffs (card) - 1) / 8;
1543 #elif defined(__x86_64__) && defined(__GNUC__)
1544 return (__builtin_ffsll (card) - 1) / 8;
1545 #elif defined(__s390x__)
1546 return (__builtin_ffsll (GUINT64_TO_LE(card)) - 1) / 8;
1549 guint8 *ptr = (guint8 *) &card;
1550 for (i = 0; i < sizeof (mword); ++i) {
1559 find_next_card (guint8 *card_data, guint8 *end)
1561 mword *cards, *cards_end;
1564 while ((((mword)card_data) & MWORD_MASK) && card_data < end) {
1570 if (card_data == end)
1573 cards = (mword*)card_data;
1574 cards_end = (mword*)((mword)end & ~MWORD_MASK);
1575 while (cards < cards_end) {
1578 return (guint8*)cards + find_card_offset (card);
1582 card_data = (guint8*)cards_end;
1583 while (card_data < end) {
1592 #define ARRAY_OBJ_INDEX(ptr,array,elem_size) (((char*)(ptr) - ((char*)(array) + G_STRUCT_OFFSET (MonoArray, vector))) / (elem_size))
1595 sgen_client_cardtable_scan_object (GCObject *obj, mword block_obj_size, guint8 *cards, ScanCopyContext ctx)
1597 MonoVTable *vt = SGEN_LOAD_VTABLE (obj);
1598 MonoClass *klass = vt->klass;
1600 SGEN_ASSERT (0, SGEN_VTABLE_HAS_REFERENCES (vt), "Why would we ever call this on reference-free objects?");
1603 MonoArray *arr = (MonoArray*)obj;
1604 guint8 *card_data, *card_base;
1605 guint8 *card_data_end;
1606 char *obj_start = (char *)sgen_card_table_align_pointer (obj);
1608 mword obj_size = sgen_mono_array_size (vt, arr, &bounds_size, sgen_vtable_get_descriptor (vt));
1609 /* We don't want to scan the bounds entries at the end of multidimensional arrays */
1610 char *obj_end = (char*)obj + obj_size - bounds_size;
1612 size_t extra_idx = 0;
1614 mword desc = (mword)klass->element_class->gc_descr;
1615 int elem_size = mono_array_element_size (klass);
1617 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1618 guint8 *overflow_scan_end = NULL;
1621 #ifdef SGEN_OBJECT_LAYOUT_STATISTICS
1622 if (klass->element_class->valuetype)
1623 sgen_object_layout_scanned_vtype_array ();
1625 sgen_object_layout_scanned_ref_array ();
1631 card_data = sgen_card_table_get_card_scan_address ((mword)obj);
1633 card_base = card_data;
1634 card_count = sgen_card_table_number_of_cards_in_range ((mword)obj, obj_size);
1635 card_data_end = card_data + card_count;
1638 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1639 /*Check for overflow and if so, setup to scan in two steps*/
1640 if (!cards && card_data_end >= SGEN_SHADOW_CARDTABLE_END) {
1641 overflow_scan_end = sgen_shadow_cardtable + (card_data_end - SGEN_SHADOW_CARDTABLE_END);
1642 card_data_end = SGEN_SHADOW_CARDTABLE_END;
1648 card_data = find_next_card (card_data, card_data_end);
1649 for (; card_data < card_data_end; card_data = find_next_card (card_data + 1, card_data_end)) {
1651 size_t idx = (card_data - card_base) + extra_idx;
1652 char *start = (char*)(obj_start + idx * CARD_SIZE_IN_BYTES);
1653 char *card_end = start + CARD_SIZE_IN_BYTES;
1654 char *first_elem, *elem;
1656 HEAVY_STAT (++los_marked_cards);
1659 sgen_card_table_prepare_card_for_scanning (card_data);
1661 card_end = MIN (card_end, obj_end);
1663 if (start <= (char*)arr->vector)
1666 index = ARRAY_OBJ_INDEX (start, obj, elem_size);
1668 elem = first_elem = (char*)mono_array_addr_with_size_fast ((MonoArray*)obj, elem_size, index);
1669 if (klass->element_class->valuetype) {
1670 ScanVTypeFunc scan_vtype_func = ctx.ops->scan_vtype;
1672 for (; elem < card_end; elem += elem_size)
1673 scan_vtype_func (obj, elem, desc, ctx.queue BINARY_PROTOCOL_ARG (elem_size));
1675 ScanPtrFieldFunc scan_ptr_field_func = ctx.ops->scan_ptr_field;
1677 HEAVY_STAT (++los_array_cards);
1678 for (; elem < card_end; elem += SIZEOF_VOID_P)
1679 scan_ptr_field_func (obj, (GCObject**)elem, ctx.queue);
1682 binary_protocol_card_scan (first_elem, elem - first_elem);
1685 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
1686 if (overflow_scan_end) {
1687 extra_idx = card_data - card_base;
1688 card_base = card_data = sgen_shadow_cardtable;
1689 card_data_end = overflow_scan_end;
1690 overflow_scan_end = NULL;
1701 * Array and string allocation
1705 mono_gc_alloc_vector (MonoVTable *vtable, size_t size, uintptr_t max_length)
1710 if (!SGEN_CAN_ALIGN_UP (size))
1713 #ifndef DISABLE_CRITICAL_REGION
1714 ENTER_CRITICAL_REGION;
1715 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1717 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1718 arr->max_length = (mono_array_size_t)max_length;
1719 EXIT_CRITICAL_REGION;
1722 EXIT_CRITICAL_REGION;
1727 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1728 if (G_UNLIKELY (!arr)) {
1733 arr->max_length = (mono_array_size_t)max_length;
1738 if (G_UNLIKELY (alloc_events))
1739 mono_profiler_allocation (&arr->obj);
1741 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Vector has incorrect size.");
1746 mono_gc_alloc_array (MonoVTable *vtable, size_t size, uintptr_t max_length, uintptr_t bounds_size)
1749 MonoArrayBounds *bounds;
1752 if (!SGEN_CAN_ALIGN_UP (size))
1755 #ifndef DISABLE_CRITICAL_REGION
1756 ENTER_CRITICAL_REGION;
1757 arr = (MonoArray*)sgen_try_alloc_obj_nolock (vtable, size);
1759 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1760 arr->max_length = (mono_array_size_t)max_length;
1762 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1763 arr->bounds = bounds;
1764 EXIT_CRITICAL_REGION;
1767 EXIT_CRITICAL_REGION;
1772 arr = (MonoArray*)sgen_alloc_obj_nolock (vtable, size);
1773 if (G_UNLIKELY (!arr)) {
1778 arr->max_length = (mono_array_size_t)max_length;
1780 bounds = (MonoArrayBounds*)((char*)arr + size - bounds_size);
1781 arr->bounds = bounds;
1786 if (G_UNLIKELY (alloc_events))
1787 mono_profiler_allocation (&arr->obj);
1789 SGEN_ASSERT (6, SGEN_ALIGN_UP (size) == SGEN_ALIGN_UP (sgen_client_par_object_get_size (vtable, (GCObject*)arr)), "Array has incorrect size.");
1794 mono_gc_alloc_string (MonoVTable *vtable, size_t size, gint32 len)
1799 if (!SGEN_CAN_ALIGN_UP (size))
1802 #ifndef DISABLE_CRITICAL_REGION
1803 ENTER_CRITICAL_REGION;
1804 str = (MonoString*)sgen_try_alloc_obj_nolock (vtable, size);
1806 /*This doesn't require fencing since EXIT_CRITICAL_REGION already does it for us*/
1808 EXIT_CRITICAL_REGION;
1811 EXIT_CRITICAL_REGION;
1816 str = (MonoString*)sgen_alloc_obj_nolock (vtable, size);
1817 if (G_UNLIKELY (!str)) {
1827 if (G_UNLIKELY (alloc_events))
1828 mono_profiler_allocation (&str->object);
1838 mono_gc_set_string_length (MonoString *str, gint32 new_length)
1840 mono_unichar2 *new_end = str->chars + new_length;
1842 /* zero the discarded string. This null-delimits the string and allows
1843 * the space to be reclaimed by SGen. */
1845 if (nursery_canaries_enabled () && sgen_ptr_in_nursery (str)) {
1846 CHECK_CANARY_FOR_OBJECT ((GCObject*)str, TRUE);
1847 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2) + CANARY_SIZE);
1848 memcpy (new_end + 1 , CANARY_STRING, CANARY_SIZE);
1850 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2));
1853 str->length = new_length;
1860 #define GC_ROOT_NUM 32
1862 int count; /* must be the first field */
1863 void *objects [GC_ROOT_NUM];
1864 int root_types [GC_ROOT_NUM];
1865 uintptr_t extra_info [GC_ROOT_NUM];
1869 notify_gc_roots (GCRootReport *report)
1873 mono_profiler_gc_roots (report->count, report->objects, report->root_types, report->extra_info);
1878 add_profile_gc_root (GCRootReport *report, void *object, int rtype, uintptr_t extra_info)
1880 if (report->count == GC_ROOT_NUM)
1881 notify_gc_roots (report);
1882 report->objects [report->count] = object;
1883 report->root_types [report->count] = rtype;
1884 report->extra_info [report->count++] = (uintptr_t)SGEN_LOAD_VTABLE (object)->klass;
1888 sgen_client_nursery_objects_pinned (void **definitely_pinned, int count)
1890 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS) {
1891 GCRootReport report;
1894 for (idx = 0; idx < count; ++idx)
1895 add_profile_gc_root (&report, definitely_pinned [idx], MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
1896 notify_gc_roots (&report);
1901 report_finalizer_roots_from_queue (SgenPointerQueue *queue)
1903 GCRootReport report;
1907 for (i = 0; i < queue->next_slot; ++i) {
1908 void *obj = queue->data [i];
1911 add_profile_gc_root (&report, obj, MONO_PROFILE_GC_ROOT_FINALIZER, 0);
1913 notify_gc_roots (&report);
1917 report_finalizer_roots (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
1919 report_finalizer_roots_from_queue (fin_ready_queue);
1920 report_finalizer_roots_from_queue (critical_fin_queue);
1923 static GCRootReport *root_report;
1926 single_arg_report_root (MonoObject **obj, void *gc_data)
1929 add_profile_gc_root (root_report, *obj, MONO_PROFILE_GC_ROOT_OTHER, 0);
1933 precisely_report_roots_from (GCRootReport *report, void** start_root, void** end_root, mword desc)
1935 switch (desc & ROOT_DESC_TYPE_MASK) {
1936 case ROOT_DESC_BITMAP:
1937 desc >>= ROOT_DESC_TYPE_SHIFT;
1939 if ((desc & 1) && *start_root) {
1940 add_profile_gc_root (report, *start_root, MONO_PROFILE_GC_ROOT_OTHER, 0);
1946 case ROOT_DESC_COMPLEX: {
1947 gsize *bitmap_data = (gsize *)sgen_get_complex_descriptor_bitmap (desc);
1948 gsize bwords = (*bitmap_data) - 1;
1949 void **start_run = start_root;
1951 while (bwords-- > 0) {
1952 gsize bmap = *bitmap_data++;
1953 void **objptr = start_run;
1955 if ((bmap & 1) && *objptr) {
1956 add_profile_gc_root (report, *objptr, MONO_PROFILE_GC_ROOT_OTHER, 0);
1961 start_run += GC_BITS_PER_WORD;
1965 case ROOT_DESC_USER: {
1966 MonoGCRootMarkFunc marker = (MonoGCRootMarkFunc)sgen_get_user_descriptor_func (desc);
1967 root_report = report;
1968 marker ((MonoObject**)start_root, single_arg_report_root, NULL);
1971 case ROOT_DESC_RUN_LEN:
1972 g_assert_not_reached ();
1974 g_assert_not_reached ();
1979 report_registered_roots_by_type (int root_type)
1981 GCRootReport report;
1985 SGEN_HASH_TABLE_FOREACH (&roots_hash [root_type], void **, start_root, RootRecord *, root) {
1986 SGEN_LOG (6, "Precise root scan %p-%p (desc: %p)", start_root, root->end_root, (void*)root->root_desc);
1987 precisely_report_roots_from (&report, start_root, (void**)root->end_root, root->root_desc);
1988 } SGEN_HASH_TABLE_FOREACH_END;
1989 notify_gc_roots (&report);
1993 report_registered_roots (void)
1995 report_registered_roots_by_type (ROOT_TYPE_NORMAL);
1996 report_registered_roots_by_type (ROOT_TYPE_WBARRIER);
2000 sgen_client_collecting_minor (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2002 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2003 report_registered_roots ();
2004 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2005 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2008 static GCRootReport major_root_report;
2009 static gboolean profile_roots;
2012 sgen_client_collecting_major_1 (void)
2014 profile_roots = mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS;
2015 memset (&major_root_report, 0, sizeof (GCRootReport));
2019 sgen_client_pinned_los_object (GCObject *obj)
2022 add_profile_gc_root (&major_root_report, (char*)obj, MONO_PROFILE_GC_ROOT_PINNING | MONO_PROFILE_GC_ROOT_MISC, 0);
2026 sgen_client_collecting_major_2 (void)
2029 notify_gc_roots (&major_root_report);
2031 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2032 report_registered_roots ();
2036 sgen_client_collecting_major_3 (SgenPointerQueue *fin_ready_queue, SgenPointerQueue *critical_fin_queue)
2038 if (mono_profiler_get_events () & MONO_PROFILE_GC_ROOTS)
2039 report_finalizer_roots (fin_ready_queue, critical_fin_queue);
2042 #define MOVED_OBJECTS_NUM 64
2043 static void *moved_objects [MOVED_OBJECTS_NUM];
2044 static int moved_objects_idx = 0;
2047 mono_sgen_register_moved_object (void *obj, void *destination)
2049 g_assert (mono_profiler_events & MONO_PROFILE_GC_MOVES);
2051 if (moved_objects_idx == MOVED_OBJECTS_NUM) {
2052 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2053 moved_objects_idx = 0;
2055 moved_objects [moved_objects_idx++] = obj;
2056 moved_objects [moved_objects_idx++] = destination;
2060 mono_sgen_gc_event_moves (void)
2062 if (moved_objects_idx) {
2063 mono_profiler_gc_moves (moved_objects, moved_objects_idx);
2064 moved_objects_idx = 0;
2072 #define REFS_SIZE 128
2075 MonoGCReferences callback;
2079 MonoObject *refs [REFS_SIZE];
2080 uintptr_t offsets [REFS_SIZE];
2084 #define HANDLE_PTR(ptr,obj) do { \
2086 if (hwi->count == REFS_SIZE) { \
2087 hwi->callback ((MonoObject*)start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data); \
2091 hwi->offsets [hwi->count] = (char*)(ptr)-(char*)start; \
2092 hwi->refs [hwi->count++] = *(ptr); \
2097 collect_references (HeapWalkInfo *hwi, GCObject *obj, size_t size)
2099 char *start = (char*)obj;
2100 mword desc = sgen_obj_get_descriptor (obj);
2102 #include "sgen/sgen-scan-object.h"
2106 walk_references (GCObject *start, size_t size, void *data)
2108 HeapWalkInfo *hwi = (HeapWalkInfo *)data;
2111 collect_references (hwi, start, size);
2112 if (hwi->count || !hwi->called)
2113 hwi->callback (start, mono_object_class (start), hwi->called? 0: size, hwi->count, hwi->refs, hwi->offsets, hwi->data);
2117 * mono_gc_walk_heap:
2118 * @flags: flags for future use
2119 * @callback: a function pointer called for each object in the heap
2120 * @data: a user data pointer that is passed to callback
2122 * This function can be used to iterate over all the live objects in the heap:
2123 * for each object, @callback is invoked, providing info about the object's
2124 * location in memory, its class, its size and the objects it references.
2125 * For each referenced object it's offset from the object address is
2126 * reported in the offsets array.
2127 * The object references may be buffered, so the callback may be invoked
2128 * multiple times for the same object: in all but the first call, the size
2129 * argument will be zero.
2130 * Note that this function can be only called in the #MONO_GC_EVENT_PRE_START_WORLD
2131 * profiler event handler.
2133 * Returns: a non-zero value if the GC doesn't support heap walking
2136 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
2141 hwi.callback = callback;
2144 sgen_clear_nursery_fragments ();
2145 sgen_scan_area_with_callback (nursery_section->data, nursery_section->end_data, walk_references, &hwi, FALSE, TRUE);
2147 major_collector.iterate_objects (ITERATE_OBJECTS_SWEEP_ALL, walk_references, &hwi);
2148 sgen_los_iterate_objects (walk_references, &hwi);
2158 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
2160 gc_callbacks = *callbacks;
2164 mono_gc_get_gc_callbacks ()
2166 return &gc_callbacks;
2170 sgen_client_thread_register (SgenThreadInfo* info, void *stack_bottom_fallback)
2173 guint8 *staddr = NULL;
2175 #ifndef HAVE_KW_THREAD
2176 g_assert (!mono_native_tls_get_value (thread_info_key));
2177 mono_native_tls_set_value (thread_info_key, info);
2179 sgen_thread_info = info;
2182 info->client_info.skip = 0;
2183 info->client_info.stopped_ip = NULL;
2184 info->client_info.stopped_domain = NULL;
2186 info->client_info.stack_start = NULL;
2188 #ifdef SGEN_POSIX_STW
2189 info->client_info.stop_count = -1;
2190 info->client_info.signal = 0;
2193 /* On win32, stack_start_limit should be 0, since the stack can grow dynamically */
2194 mono_thread_info_get_stack_bounds (&staddr, &stsize);
2197 info->client_info.stack_start_limit = staddr;
2199 info->client_info.stack_end = staddr + stsize;
2201 gsize stack_bottom = (gsize)stack_bottom_fallback;
2202 stack_bottom += 4095;
2203 stack_bottom &= ~4095;
2204 info->client_info.stack_end = (char*)stack_bottom;
2208 memset (&info->client_info.ctx, 0, sizeof (MonoContext));
2210 memset (&info->client_info.regs, 0, sizeof (info->client_info.regs));
2213 if (mono_gc_get_gc_callbacks ()->thread_attach_func)
2214 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2216 binary_protocol_thread_register ((gpointer)mono_thread_info_get_tid (info));
2218 SGEN_LOG (3, "registered thread %p (%p) stack end %p", info, (gpointer)mono_thread_info_get_tid (info), info->client_info.stack_end);
2222 sgen_client_thread_unregister (SgenThreadInfo *p)
2224 MonoNativeThreadId tid;
2226 #ifndef HAVE_KW_THREAD
2227 mono_native_tls_set_value (thread_info_key, NULL);
2229 sgen_thread_info = NULL;
2232 tid = mono_thread_info_get_tid (p);
2234 if (p->client_info.info.runtime_thread)
2235 mono_threads_add_joinable_thread ((gpointer)tid);
2237 if (mono_gc_get_gc_callbacks ()->thread_detach_func) {
2238 mono_gc_get_gc_callbacks ()->thread_detach_func (p->client_info.runtime_data);
2239 p->client_info.runtime_data = NULL;
2242 binary_protocol_thread_unregister ((gpointer)tid);
2243 SGEN_LOG (3, "unregister thread %p (%p)", p, (gpointer)tid);
2247 mono_gc_set_skip_thread (gboolean skip)
2249 SgenThreadInfo *info = mono_thread_info_current ();
2252 info->client_info.gc_disabled = skip;
2257 is_critical_method (MonoMethod *method)
2259 return mono_runtime_is_critical_method (method) || sgen_is_critical_method (method);
2263 thread_in_critical_region (SgenThreadInfo *info)
2265 return info->client_info.in_critical_region;
2269 sgen_thread_attach (SgenThreadInfo *info)
2271 mono_handle_arena_init ((MonoHandleArena**) &info->client_info.info.handle_arena);
2273 if (mono_gc_get_gc_callbacks ()->thread_attach_func && !info->client_info.runtime_data)
2274 info->client_info.runtime_data = mono_gc_get_gc_callbacks ()->thread_attach_func ();
2278 sgen_thread_detach (SgenThreadInfo *p)
2280 /* If a delegate is passed to native code and invoked on a thread we dont
2281 * know about, the jit will register it with mono_jit_thread_attach, but
2282 * we have no way of knowing when that thread goes away. SGen has a TSD
2283 * so we assume that if the domain is still registered, we can detach
2286 if (mono_domain_get ())
2287 mono_thread_detach_internal (mono_thread_internal_current ());
2289 mono_handle_arena_cleanup ((MonoHandleArena**) &p->client_info.info.handle_arena);
2293 mono_gc_register_thread (void *baseptr)
2295 return mono_thread_info_attach (baseptr) != NULL;
2299 mono_gc_is_gc_thread (void)
2303 result = mono_thread_info_current () != NULL;
2309 sgen_client_thread_register_worker (void)
2311 mono_thread_info_register_small_id ();
2314 /* Variables holding start/end nursery so it won't have to be passed at every call */
2315 static void *scan_area_arg_start, *scan_area_arg_end;
2318 mono_gc_conservatively_scan_area (void *start, void *end)
2320 sgen_conservatively_pin_objects_from ((void **)start, (void **)end, scan_area_arg_start, scan_area_arg_end, PIN_TYPE_STACK);
2324 mono_gc_scan_object (void *obj, void *gc_data)
2326 ScanCopyContext *ctx = (ScanCopyContext *)gc_data;
2327 ctx->ops->copy_or_mark_object ((GCObject**)&obj, ctx->queue);
2332 * Mark from thread stacks and registers.
2335 sgen_client_scan_thread_data (void *start_nursery, void *end_nursery, gboolean precise, ScanCopyContext ctx)
2337 scan_area_arg_start = start_nursery;
2338 scan_area_arg_end = end_nursery;
2340 FOREACH_THREAD (info) {
2341 int skip_reason = 0;
2342 void *aligned_stack_start = (void*)(mword) ALIGN_TO ((mword)info->client_info.stack_start, SIZEOF_VOID_P);
2344 if (info->client_info.skip) {
2345 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);
2347 } else if (info->client_info.gc_disabled) {
2348 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);
2350 } else if (!mono_thread_info_is_live (info)) {
2351 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);
2355 binary_protocol_scan_stack ((gpointer)mono_thread_info_get_tid (info), info->client_info.stack_start, info->client_info.stack_end, skip_reason);
2360 g_assert (info->client_info.suspend_done);
2361 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 ());
2362 if (mono_gc_get_gc_callbacks ()->thread_mark_func && !conservative_stack_mark) {
2363 mono_gc_get_gc_callbacks ()->thread_mark_func (info->client_info.runtime_data, (guint8 *)aligned_stack_start, (guint8 *)info->client_info.stack_end, precise, &ctx);
2364 } else if (!precise) {
2365 if (!conservative_stack_mark) {
2366 fprintf (stderr, "Precise stack mark not supported - disabling.\n");
2367 conservative_stack_mark = TRUE;
2369 sgen_conservatively_pin_objects_from ((void **)aligned_stack_start, (void **)info->client_info.stack_end, start_nursery, end_nursery, PIN_TYPE_STACK);
2374 sgen_conservatively_pin_objects_from ((void**)&info->client_info.ctx, (void**)(&info->client_info.ctx + 1),
2375 start_nursery, end_nursery, PIN_TYPE_STACK);
2377 sgen_conservatively_pin_objects_from ((void**)&info->client_info.regs, (void**)&info->client_info.regs + ARCH_NUM_REGS,
2378 start_nursery, end_nursery, PIN_TYPE_STACK);
2381 // This is used on Coop GC for platforms where we cannot get the data for individual registers.
2382 // We force a spill of all registers into the stack and pass a chunk of data into sgen.
2383 MonoThreadUnwindState *state = &info->client_info.info.thread_saved_state [SELF_SUSPEND_STATE_INDEX];
2384 if (state && state->gc_stackdata) {
2385 sgen_conservatively_pin_objects_from ((void **)state->gc_stackdata, (void**)((char*)state->gc_stackdata + state->gc_stackdata_size),
2386 start_nursery, end_nursery, PIN_TYPE_STACK);
2390 } FOREACH_THREAD_END
2394 * mono_gc_set_stack_end:
2396 * Set the end of the current threads stack to STACK_END. The stack space between
2397 * STACK_END and the real end of the threads stack will not be scanned during collections.
2400 mono_gc_set_stack_end (void *stack_end)
2402 SgenThreadInfo *info;
2405 info = mono_thread_info_current ();
2407 SGEN_ASSERT (0, stack_end < info->client_info.stack_end, "Can only lower stack end");
2408 info->client_info.stack_end = stack_end;
2418 mono_gc_register_root (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2420 return sgen_register_root (start, size, descr, descr ? ROOT_TYPE_NORMAL : ROOT_TYPE_PINNED, source, msg);
2424 mono_gc_register_root_wbarrier (char *start, size_t size, MonoGCDescriptor descr, MonoGCRootSource source, const char *msg)
2426 return sgen_register_root (start, size, descr, ROOT_TYPE_WBARRIER, source, msg);
2430 mono_gc_deregister_root (char* addr)
2432 sgen_deregister_root (addr);
2441 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
2443 return pthread_create (new_thread, attr, start_routine, arg);
2452 sgen_client_total_allocated_heap_changed (size_t allocated_heap)
2454 mono_runtime_resource_check_limit (MONO_RESOURCE_GC_HEAP, allocated_heap);
2458 mono_gc_user_markers_supported (void)
2464 mono_object_is_alive (MonoObject* o)
2470 mono_gc_get_generation (MonoObject *obj)
2472 if (sgen_ptr_in_nursery (obj))
2478 mono_gc_enable_events (void)
2483 mono_gc_get_gc_name (void)
2489 mono_gc_get_description (void)
2491 return g_strdup ("sgen");
2495 mono_gc_set_desktop_mode (void)
2500 mono_gc_is_moving (void)
2506 mono_gc_is_disabled (void)
2512 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
2519 mono_gc_max_generation (void)
2525 mono_gc_precise_stack_mark_enabled (void)
2527 return !conservative_stack_mark;
2531 mono_gc_collect (int generation)
2533 sgen_gc_collect (generation);
2537 mono_gc_collection_count (int generation)
2539 return sgen_gc_collection_count (generation);
2543 mono_gc_get_used_size (void)
2545 return (int64_t)sgen_gc_get_used_size ();
2549 mono_gc_get_heap_size (void)
2551 return (int64_t)sgen_gc_get_total_heap_allocation ();
2555 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
2557 return sgen_make_user_root_descriptor (marker);
2561 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
2563 return SGEN_DESC_STRING;
2567 mono_gc_get_nursery (int *shift_bits, size_t *size)
2569 *size = sgen_nursery_size;
2570 *shift_bits = DEFAULT_NURSERY_BITS;
2571 return sgen_get_nursery_start ();
2575 mono_gc_get_los_limit (void)
2577 return SGEN_MAX_SMALL_OBJ_SIZE;
2581 sgen_client_default_metadata (void)
2583 return mono_domain_get ();
2587 sgen_client_metadata_for_object (GCObject *obj)
2589 return mono_object_domain (obj);
2593 * mono_gchandle_is_in_domain:
2594 * @gchandle: a GCHandle's handle.
2595 * @domain: An application domain.
2597 * Returns: TRUE if the object wrapped by the @gchandle belongs to the specific @domain.
2600 mono_gchandle_is_in_domain (guint32 gchandle, MonoDomain *domain)
2602 MonoDomain *gchandle_domain = (MonoDomain *)sgen_gchandle_get_metadata (gchandle);
2603 return domain->domain_id == gchandle_domain->domain_id;
2607 * mono_gchandle_free_domain:
2608 * @unloading: domain that is unloading
2610 * Function used internally to cleanup any GC handle for objects belonging
2611 * to the specified domain during appdomain unload.
2614 mono_gchandle_free_domain (MonoDomain *unloading)
2619 null_link_if_in_domain (gpointer hidden, GCHandleType handle_type, int max_generation, gpointer user)
2621 MonoDomain *unloading_domain = (MonoDomain *)user;
2622 MonoDomain *obj_domain;
2623 gboolean is_weak = MONO_GC_HANDLE_TYPE_IS_WEAK (handle_type);
2624 if (MONO_GC_HANDLE_IS_OBJECT_POINTER (hidden)) {
2625 MonoObject *obj = (MonoObject *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2626 obj_domain = mono_object_domain (obj);
2628 obj_domain = (MonoDomain *)MONO_GC_REVEAL_POINTER (hidden, is_weak);
2630 if (unloading_domain->domain_id == obj_domain->domain_id)
2636 sgen_null_links_for_domain (MonoDomain *domain)
2639 for (type = HANDLE_TYPE_MIN; type < HANDLE_TYPE_MAX; ++type)
2640 sgen_gchandle_iterate ((GCHandleType)type, GENERATION_OLD, null_link_if_in_domain, domain);
2644 mono_gchandle_set_target (guint32 gchandle, MonoObject *obj)
2646 sgen_gchandle_set_target (gchandle, obj);
2650 sgen_client_gchandle_created (int handle_type, GCObject *obj, guint32 handle)
2652 #ifndef DISABLE_PERFCOUNTERS
2653 mono_perfcounters->gc_num_handles++;
2655 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_CREATED, handle_type, handle, obj);
2659 sgen_client_gchandle_destroyed (int handle_type, guint32 handle)
2661 #ifndef DISABLE_PERFCOUNTERS
2662 mono_perfcounters->gc_num_handles--;
2664 mono_profiler_gc_handle (MONO_PROFILER_GC_HANDLE_DESTROYED, handle_type, handle, NULL);
2668 sgen_client_ensure_weak_gchandles_accessible (void)
2671 * During the second bridge processing step the world is
2672 * running again. That step processes all weak links once
2673 * more to null those that refer to dead objects. Before that
2674 * is completed, those links must not be followed, so we
2675 * conservatively wait for bridge processing when any weak
2676 * link is dereferenced.
2678 /* FIXME: A GC can occur after this check fails, in which case we
2679 * should wait for bridge processing but would fail to do so.
2681 if (G_UNLIKELY (bridge_processing_in_progress))
2682 mono_gc_wait_for_bridge_processing ();
2686 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
2690 result = func (data);
2691 UNLOCK_INTERRUPTION;
2696 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
2702 mono_gc_get_card_table (int *shift_bits, gpointer *mask)
2704 return sgen_get_card_table_configuration (shift_bits, mask);
2708 mono_gc_card_table_nursery_check (void)
2710 return !sgen_get_major_collector ()->is_concurrent;
2713 /* Negative value to remove */
2715 mono_gc_add_memory_pressure (gint64 value)
2717 /* FIXME: Implement at some point? */
2725 sgen_client_degraded_allocation (size_t size)
2727 static int last_major_gc_warned = -1;
2728 static int num_degraded = 0;
2730 if (last_major_gc_warned < (int)gc_stats.major_gc_count) {
2732 if (num_degraded == 1 || num_degraded == 3)
2733 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Degraded allocation. Consider increasing nursery-size if the warning persists.");
2734 else if (num_degraded == 10)
2735 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "Warning: Repeated degraded allocation. Consider increasing nursery-size.");
2736 last_major_gc_warned = gc_stats.major_gc_count;
2741 sgen_client_log_timing (GGTimingInfo *info, mword last_major_num_sections, mword last_los_memory_usage)
2743 SgenMajorCollector *major_collector = sgen_get_major_collector ();
2744 mword num_major_sections = major_collector->get_num_major_sections ();
2745 char full_timing_buff [1024];
2746 full_timing_buff [0] = '\0';
2748 if (!info->is_overflow)
2749 sprintf (full_timing_buff, "total %.2fms, bridge %.2fms", info->stw_time / 10000.0f, (int)info->bridge_time / 10000.0f);
2750 if (info->generation == GENERATION_OLD)
2751 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "GC_MAJOR%s: (%s) pause %.2fms, %s major %dK/%dK los %dK/%dK",
2752 info->is_overflow ? "_OVERFLOW" : "",
2753 info->reason ? info->reason : "",
2754 (int)info->total_time / 10000.0f,
2756 major_collector->section_size * num_major_sections / 1024,
2757 major_collector->section_size * last_major_num_sections / 1024,
2758 los_memory_usage / 1024,
2759 last_los_memory_usage / 1024);
2761 mono_trace (G_LOG_LEVEL_INFO, MONO_TRACE_GC, "GC_MINOR%s: (%s) pause %.2fms, %s promoted %dK major %dK los %dK",
2762 info->is_overflow ? "_OVERFLOW" : "",
2763 info->reason ? info->reason : "",
2764 (int)info->total_time / 10000.0f,
2766 (num_major_sections - last_major_num_sections) * major_collector->section_size / 1024,
2767 major_collector->section_size * num_major_sections / 1024,
2768 los_memory_usage / 1024);
2776 sgen_client_description_for_internal_mem_type (int type)
2779 case INTERNAL_MEM_EPHEMERON_LINK: return "ephemeron-link";
2786 sgen_client_pre_collection_checks (void)
2788 if (sgen_mono_xdomain_checks) {
2789 sgen_clear_nursery_fragments ();
2790 sgen_check_for_xdomain_refs ();
2795 sgen_client_vtable_is_inited (MonoVTable *vt)
2797 return vt->klass->inited;
2801 sgen_client_vtable_get_namespace (MonoVTable *vt)
2803 return vt->klass->name_space;
2807 sgen_client_vtable_get_name (MonoVTable *vt)
2809 return vt->klass->name;
2817 sgen_client_init (void)
2820 MonoThreadInfoCallbacks cb;
2822 cb.thread_register = sgen_thread_register;
2823 cb.thread_detach = sgen_thread_detach;
2824 cb.thread_unregister = sgen_thread_unregister;
2825 cb.thread_attach = sgen_thread_attach;
2826 cb.mono_method_is_critical = (gboolean (*)(void *))is_critical_method;
2827 cb.mono_thread_in_critical_region = thread_in_critical_region;
2829 mono_threads_init (&cb, sizeof (SgenThreadInfo));
2831 ///* Keep this the default for now */
2832 /* Precise marking is broken on all supported targets. Disable until fixed. */
2833 conservative_stack_mark = TRUE;
2835 sgen_register_fixed_internal_mem_type (INTERNAL_MEM_EPHEMERON_LINK, sizeof (EphemeronLinkNode));
2837 mono_sgen_init_stw ();
2839 #ifndef HAVE_KW_THREAD
2840 mono_native_tls_alloc (&thread_info_key, NULL);
2841 #if defined(TARGET_OSX) || defined(TARGET_WIN32) || defined(TARGET_ANDROID) || defined(TARGET_IOS)
2843 * CEE_MONO_TLS requires the tls offset, not the key, so the code below only works on darwin,
2844 * where the two are the same.
2846 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO, thread_info_key);
2850 int tls_offset = -1;
2851 MONO_THREAD_VAR_OFFSET (sgen_thread_info, tls_offset);
2852 mono_tls_key_set_offset (TLS_KEY_SGEN_THREAD_INFO, tls_offset);
2857 * This needs to happen before any internal allocations because
2858 * it inits the small id which is required for hazard pointer
2863 mono_gc_register_thread (&dummy);
2867 sgen_client_handle_gc_param (const char *opt)
2869 if (g_str_has_prefix (opt, "stack-mark=")) {
2870 opt = strchr (opt, '=') + 1;
2871 if (!strcmp (opt, "precise")) {
2872 conservative_stack_mark = FALSE;
2873 } else if (!strcmp (opt, "conservative")) {
2874 conservative_stack_mark = TRUE;
2876 sgen_env_var_error (MONO_GC_PARAMS_NAME, conservative_stack_mark ? "Using `conservative`." : "Using `precise`.",
2877 "Invalid value `%s` for `stack-mark` option, possible values are: `precise`, `conservative`.", opt);
2879 } else if (g_str_has_prefix (opt, "bridge-implementation=")) {
2880 opt = strchr (opt, '=') + 1;
2881 sgen_set_bridge_implementation (opt);
2882 } else if (g_str_has_prefix (opt, "toggleref-test")) {
2883 /* FIXME: This should probably in MONO_GC_DEBUG */
2884 sgen_register_test_toggleref_callback ();
2892 sgen_client_print_gc_params_usage (void)
2894 fprintf (stderr, " stack-mark=MARK-METHOD (where MARK-METHOD is 'precise' or 'conservative')\n");
2898 sgen_client_handle_gc_debug (const char *opt)
2900 if (!strcmp (opt, "xdomain-checks")) {
2901 sgen_mono_xdomain_checks = TRUE;
2902 } else if (!strcmp (opt, "do-not-finalize")) {
2903 mono_do_not_finalize = TRUE;
2904 } else if (g_str_has_prefix (opt, "do-not-finalize=")) {
2905 opt = strchr (opt, '=') + 1;
2906 mono_do_not_finalize = TRUE;
2907 mono_do_not_finalize_class_names = g_strsplit (opt, ",", 0);
2908 } else if (!strcmp (opt, "log-finalizers")) {
2909 log_finalizers = TRUE;
2910 } else if (!strcmp (opt, "no-managed-allocator")) {
2911 sgen_set_use_managed_allocator (FALSE);
2912 } else if (!sgen_bridge_handle_gc_debug (opt)) {
2919 sgen_client_print_gc_debug_usage (void)
2921 fprintf (stderr, " xdomain-checks\n");
2922 fprintf (stderr, " do-not-finalize\n");
2923 fprintf (stderr, " log-finalizers\n");
2924 fprintf (stderr, " no-managed-allocator\n");
2925 sgen_bridge_print_gc_debug_usage ();
2930 sgen_client_get_provenance (void)
2932 #ifdef SGEN_OBJECT_PROVENANCE
2933 MonoGCCallbacks *cb = mono_gc_get_gc_callbacks ();
2934 gpointer (*get_provenance_func) (void);
2937 get_provenance_func = cb->get_provenance_func;
2938 if (get_provenance_func)
2939 return get_provenance_func ();
2947 sgen_client_describe_invalid_pointer (GCObject *ptr)
2949 sgen_bridge_describe_pointer (ptr);
2953 mono_gc_base_init (void)
2955 mono_counters_init ();
2957 #ifdef HEAVY_STATISTICS
2958 mono_counters_register ("los marked cards", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_marked_cards);
2959 mono_counters_register ("los array cards scanned ", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_cards);
2960 mono_counters_register ("los array remsets", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &los_array_remsets);
2962 mono_counters_register ("WBarrier set arrayref", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_set_arrayref);
2963 mono_counters_register ("WBarrier value copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_value_copy);
2964 mono_counters_register ("WBarrier object copy", MONO_COUNTER_GC | MONO_COUNTER_ULONG, &stat_wbarrier_object_copy);
2969 if (nursery_canaries_enabled ())
2970 sgen_set_use_managed_allocator (FALSE);
2972 #if defined(HAVE_KW_THREAD)
2973 /* This can happen with using libmonosgen.so */
2974 if (mono_tls_key_get_offset (TLS_KEY_SGEN_TLAB_NEXT_ADDR) == -1)
2975 sgen_set_use_managed_allocator (FALSE);
2980 mono_gc_base_cleanup (void)
2982 sgen_thread_pool_shutdown ();
2986 mono_gc_is_null (void)