2 * boehm-gc.c: GC implementation using either the installed or included Boehm GC.
4 * Copyright 2001-2003 Ximian, Inc (http://www.ximian.com)
5 * Copyright 2004-2009 Novell, Inc (http://www.novell.com)
9 #define GC_I_HIDE_POINTERS
10 #include <mono/metadata/gc-internal.h>
11 #include <mono/metadata/mono-gc.h>
12 #include <mono/metadata/gc-internal.h>
13 #include <mono/metadata/profiler-private.h>
14 #include <mono/metadata/class-internals.h>
15 #include <mono/metadata/method-builder.h>
16 #include <mono/metadata/opcodes.h>
17 #include <mono/metadata/domain-internals.h>
18 #include <mono/metadata/metadata-internals.h>
19 #include <mono/metadata/marshal.h>
20 #include <mono/utils/mono-logger.h>
21 #include <mono/utils/mono-time.h>
22 #include <mono/utils/dtrace.h>
26 #ifdef USE_INCLUDED_LIBGC
29 #define THREAD_LOCAL_ALLOC 1
30 #include "private/pthread_support.h"
33 #define GC_NO_DESCRIPTOR ((gpointer)(0 | GC_DS_LENGTH))
35 static gboolean gc_initialized = FALSE;
38 mono_gc_warning (char *msg, GC_word arg)
40 mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_GC, msg, (unsigned long)arg);
44 mono_gc_base_init (void)
50 * Handle the case when we are called from a thread different from the main thread,
52 * FIXME: Move this to libgc where it belongs.
54 * we used to do this only when running on valgrind,
55 * but it happens also in other setups.
57 #if defined(HAVE_PTHREAD_GETATTR_NP) && defined(HAVE_PTHREAD_ATTR_GETSTACK)
62 pthread_getattr_np (pthread_self (), &attr);
63 pthread_attr_getstack (&attr, &sstart, &size);
64 pthread_attr_destroy (&attr);
65 /*g_print ("stackbottom pth is: %p\n", (char*)sstart + size);*/
68 * The calculation above doesn't seem to work on ia64, also we need to set
69 * GC_register_stackbottom as well, but don't know how.
72 /* apparently with some linuxthreads implementations sstart can be NULL,
73 * fallback to the more imprecise method (bug# 78096).
76 GC_stackbottom = (char*)sstart + size;
79 gsize stack_bottom = (gsize)&dummy;
81 stack_bottom &= ~4095;
82 GC_stackbottom = (char*)stack_bottom;
86 #elif defined(HAVE_PTHREAD_GET_STACKSIZE_NP) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
87 GC_stackbottom = (char*)pthread_get_stackaddr_np (pthread_self ());
91 gsize stack_bottom = (gsize)&dummy;
93 stack_bottom &= ~4095;
94 /*g_print ("stackbottom is: %p\n", (char*)stack_bottom);*/
95 GC_stackbottom = (char*)stack_bottom;
99 #if !defined(PLATFORM_ANDROID)
100 /* If GC_no_dls is set to true, GC_find_limit is not called. This causes a seg fault on Android. */
104 GC_oom_fn = mono_gc_out_of_memory;
105 GC_set_warn_proc (mono_gc_warning);
106 GC_finalize_on_demand = 1;
107 GC_finalizer_notifier = mono_gc_finalize_notify;
109 #ifdef HAVE_GC_GCJ_MALLOC
110 GC_init_gcj_malloc (5, NULL);
112 mono_gc_enable_events ();
113 gc_initialized = TRUE;
117 mono_gc_collect (int generation)
119 MONO_PROBE_GC_BEGIN (generation);
121 mono_perfcounters->gc_induced++;
124 MONO_PROBE_GC_END (generation);
125 #if defined(ENABLE_DTRACE) && defined(__sun__)
126 /* This works around a dtrace -G problem on Solaris.
127 Limit its actual use to when the probe is enabled. */
128 if (MONO_PROBE_GC_END_ENABLED ())
134 mono_gc_max_generation (void)
140 mono_gc_get_generation (MonoObject *object)
146 mono_gc_collection_count (int generation)
152 mono_gc_add_memory_pressure (gint64 value)
157 mono_gc_get_used_size (void)
159 return GC_get_heap_size () - GC_get_free_bytes ();
163 mono_gc_get_heap_size (void)
165 return GC_get_heap_size ();
169 mono_gc_disable (void)
171 #ifdef HAVE_GC_ENABLE
174 g_assert_not_reached ();
179 mono_gc_enable (void)
181 #ifdef HAVE_GC_ENABLE
184 g_assert_not_reached ();
189 mono_gc_is_gc_thread (void)
191 #if GC_VERSION_MAJOR >= 7
193 #elif defined(USE_INCLUDED_LIBGC)
194 return GC_thread_is_registered ();
200 extern int GC_thread_register_foreign (void *base_addr);
203 mono_gc_register_thread (void *baseptr)
205 #if GC_VERSION_MAJOR >= 7
206 struct GC_stack_base sb;
209 res = GC_get_stack_base (&sb);
210 if (res != GC_SUCCESS) {
211 sb.mem_base = baseptr;
213 /* Can't determine the register stack bounds */
214 g_error ("mono_gc_register_thread failed ().\n");
217 res = GC_register_my_thread (&sb);
218 if ((res != GC_SUCCESS) && (res != GC_DUPLICATE)) {
219 g_warning ("GC_register_my_thread () failed.\n");
224 if (mono_gc_is_gc_thread())
226 #if defined(USE_INCLUDED_LIBGC) && !defined(HOST_WIN32)
227 return GC_thread_register_foreign (baseptr);
235 mono_object_is_alive (MonoObject* o)
237 #ifdef USE_INCLUDED_LIBGC
238 return GC_is_marked ((gpointer)o);
244 #ifdef USE_INCLUDED_LIBGC
246 static gint64 gc_start_time;
249 on_gc_notification (GCEventType event)
251 if (event == MONO_GC_EVENT_START) {
252 mono_perfcounters->gc_collections0++;
253 mono_stats.major_gc_count ++;
254 gc_start_time = mono_100ns_ticks ();
255 } else if (event == MONO_GC_EVENT_END) {
256 guint64 heap_size = GC_get_heap_size ();
257 guint64 used_size = heap_size - GC_get_free_bytes ();
258 mono_perfcounters->gc_total_bytes = used_size;
259 mono_perfcounters->gc_committed_bytes = heap_size;
260 mono_perfcounters->gc_reserved_bytes = heap_size;
261 mono_perfcounters->gc_gen0size = heap_size;
262 mono_stats.major_gc_time_usecs += (mono_100ns_ticks () - gc_start_time) / 10;
263 mono_trace_message (MONO_TRACE_GC, "gc took %d usecs", (mono_100ns_ticks () - gc_start_time) / 10);
265 mono_profiler_gc_event ((MonoGCEvent) event, 0);
269 on_gc_heap_resize (size_t new_size)
271 guint64 heap_size = GC_get_heap_size ();
272 mono_perfcounters->gc_committed_bytes = heap_size;
273 mono_perfcounters->gc_reserved_bytes = heap_size;
274 mono_perfcounters->gc_gen0size = heap_size;
275 mono_profiler_gc_heap_resize (new_size);
279 mono_gc_enable_events (void)
281 GC_notify_event = on_gc_notification;
282 GC_on_heap_resize = on_gc_heap_resize;
288 mono_gc_enable_events (void)
295 mono_gc_register_root (char *start, size_t size, void *descr)
297 /* for some strange reason, they want one extra byte on the end */
298 GC_add_roots (start, start + size + 1);
304 mono_gc_deregister_root (char* addr)
307 /* FIXME: libgc doesn't define this work win32 for some reason */
308 /* FIXME: No size info */
309 GC_remove_roots (addr, addr + sizeof (gpointer) + 1);
314 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
316 /* libgc requires that we use HIDE_POINTER... */
317 *link_addr = (void*)HIDE_POINTER (obj);
318 GC_GENERAL_REGISTER_DISAPPEARING_LINK (link_addr, obj);
322 mono_gc_weak_link_remove (void **link_addr)
324 GC_unregister_disappearing_link (link_addr);
329 reveal_link (gpointer link_addr)
331 void **link_a = link_addr;
332 return REVEAL_POINTER (*link_a);
336 mono_gc_weak_link_get (void **link_addr)
338 MonoObject *obj = GC_call_with_alloc_lock (reveal_link, link_addr);
339 if (obj == (MonoObject *) -1)
345 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
347 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
351 mono_gc_make_descr_for_object (gsize *bitmap, int numbits, size_t obj_size)
353 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
357 mono_gc_make_descr_for_array (int vector, gsize *elem_bitmap, int numbits, size_t elem_size)
359 /* libgc has no usable support for arrays... */
360 return GC_NO_DESCRIPTOR;
364 mono_gc_make_descr_from_bitmap (gsize *bitmap, int numbits)
366 #ifdef HAVE_GC_GCJ_MALLOC
367 /* It seems there are issues when the bitmap doesn't fit: play it safe */
369 return GC_NO_DESCRIPTOR;
371 return (gpointer)GC_make_descriptor ((GC_bitmap)bitmap, numbits);
378 mono_gc_alloc_fixed (size_t size, void *descr)
380 /* To help track down typed allocation bugs */
384 if (count == atoi (getenv ("COUNT2")))
386 if (count > atoi (getenv ("COUNT2")))
387 return GC_MALLOC (size);
391 return GC_MALLOC_EXPLICITLY_TYPED (size, (GC_descr)descr);
393 return GC_MALLOC (size);
397 mono_gc_free_fixed (void* addr)
402 mono_gc_invoke_finalizers (void)
404 /* There is a bug in GC_invoke_finalizer () in versions <= 6.2alpha4:
405 * the 'mem_freed' variable is not initialized when there are no
406 * objects to finalize, which leads to strange behavior later on.
407 * The check is necessary to work around that bug.
409 if (GC_should_invoke_finalizers ())
410 return GC_invoke_finalizers ();
415 mono_gc_pending_finalizers (void)
417 return GC_should_invoke_finalizers ();
421 * LOCKING: Assumes the domain_finalizers lock is held.
424 add_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
428 if (!domain->track_resurrection_objects_hash)
429 domain->track_resurrection_objects_hash = g_hash_table_new (mono_aligned_addr_hash, NULL);
431 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
432 refs = g_slist_prepend (refs, GUINT_TO_POINTER (gchandle));
433 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
437 mono_gc_add_weak_track_handle (MonoObject *obj, guint32 handle)
444 domain = mono_object_get_domain (obj);
446 mono_domain_finalizers_lock (domain);
448 add_weak_track_handle_internal (domain, obj, handle);
450 g_hash_table_insert (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (handle), obj);
452 mono_domain_finalizers_unlock (domain);
456 * LOCKING: Assumes the domain_finalizers lock is held.
459 remove_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
463 if (!domain->track_resurrection_objects_hash)
466 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
467 refs = g_slist_remove (refs, GUINT_TO_POINTER (gchandle));
468 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
472 mono_gc_change_weak_track_handle (MonoObject *old_obj, MonoObject *obj, guint32 gchandle)
474 MonoDomain *domain = mono_domain_get ();
476 mono_domain_finalizers_lock (domain);
479 remove_weak_track_handle_internal (domain, old_obj, gchandle);
481 add_weak_track_handle_internal (domain, obj, gchandle);
483 mono_domain_finalizers_unlock (domain);
487 mono_gc_remove_weak_track_handle (guint32 gchandle)
489 MonoDomain *domain = mono_domain_get ();
492 /* Clean our entries in the two hashes in MonoDomain */
494 mono_domain_finalizers_lock (domain);
496 /* Get the original object this handle pointed to */
497 obj = g_hash_table_lookup (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
499 g_hash_table_remove (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
501 remove_weak_track_handle_internal (domain, obj, gchandle);
504 mono_domain_finalizers_unlock (domain);
508 mono_gc_remove_weak_track_object (MonoDomain *domain, MonoObject *obj)
512 if (domain->track_resurrection_objects_hash) {
513 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
517 * Since we don't run finalizers again for resurrected objects,
518 * no need to keep these around.
520 g_hash_table_remove (domain->track_resurrection_objects_hash, obj);
527 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
529 *(void**)field_ptr = value;
533 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
535 *(void**)slot_ptr = value;
539 mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
541 memmove (dest_ptr, src_ptr, count * sizeof (gpointer));
545 mono_gc_wbarrier_generic_store (gpointer ptr, MonoObject* value)
547 *(void**)ptr = value;
551 mono_gc_wbarrier_generic_nostore (gpointer ptr)
556 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
558 memmove (dest, src, count * mono_class_value_size (klass, NULL));
562 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
564 /* do not copy the sync state */
565 memcpy ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
566 mono_object_class (obj)->instance_size - sizeof (MonoObject));
570 mono_gc_clear_domain (MonoDomain *domain)
575 mono_gc_get_suspend_signal (void)
577 #ifdef USE_INCLUDED_GC
578 return GC_get_suspend_signal ();
584 #if defined(USE_INCLUDED_LIBGC) && defined(USE_COMPILER_TLS) && defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
585 extern __thread MONO_TLS_FAST void* GC_thread_tls;
586 #include "metadata-internals.h"
592 while (!(v & (1 << i)))
599 ATYPE_FREEPTR_FOR_BOX,
607 create_allocator (int atype, int offset)
609 int index_var, bytes_var, my_fl_var, my_entry_var;
610 guint32 no_freelist_branch, not_small_enough_branch = 0;
611 guint32 size_overflow_branch = 0;
612 MonoMethodBuilder *mb;
614 MonoMethodSignature *csig;
615 AllocatorWrapperInfo *info;
617 if (atype == ATYPE_STRING) {
618 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
619 csig->ret = &mono_defaults.string_class->byval_arg;
620 csig->params [0] = &mono_defaults.int_class->byval_arg;
621 csig->params [1] = &mono_defaults.int32_class->byval_arg;
623 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
624 csig->ret = &mono_defaults.object_class->byval_arg;
625 csig->params [0] = &mono_defaults.int_class->byval_arg;
628 mb = mono_mb_new (mono_defaults.object_class, "Alloc", MONO_WRAPPER_ALLOC);
629 bytes_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
630 if (atype == ATYPE_STRING) {
631 /* a string alloator method takes the args: (vtable, len) */
632 /* bytes = (sizeof (MonoString) + ((len + 1) * 2)); */
633 mono_mb_emit_ldarg (mb, 1);
634 mono_mb_emit_icon (mb, 1);
635 mono_mb_emit_byte (mb, MONO_CEE_ADD);
636 mono_mb_emit_icon (mb, 1);
637 mono_mb_emit_byte (mb, MONO_CEE_SHL);
638 // sizeof (MonoString) might include padding
639 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, chars));
640 mono_mb_emit_byte (mb, MONO_CEE_ADD);
641 mono_mb_emit_stloc (mb, bytes_var);
643 /* bytes = vtable->klass->instance_size */
644 mono_mb_emit_ldarg (mb, 0);
645 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoVTable, klass));
646 mono_mb_emit_byte (mb, MONO_CEE_ADD);
647 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
648 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoClass, instance_size));
649 mono_mb_emit_byte (mb, MONO_CEE_ADD);
650 /* FIXME: assert instance_size stays a 4 byte integer */
651 mono_mb_emit_byte (mb, MONO_CEE_LDIND_U4);
652 mono_mb_emit_stloc (mb, bytes_var);
655 /* this is needed for strings/arrays only as the other big types are never allocated with this method */
656 if (atype == ATYPE_STRING) {
658 /* if (!SMALL_ENOUGH (bytes)) jump slow_path;*/
659 mono_mb_emit_ldloc (mb, bytes_var);
660 mono_mb_emit_icon (mb, (NFREELISTS-1) * GRANULARITY);
661 not_small_enough_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
662 /* check for overflow */
663 mono_mb_emit_ldloc (mb, bytes_var);
664 mono_mb_emit_icon (mb, sizeof (MonoString));
665 size_overflow_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
668 /* int index = INDEX_FROM_BYTES(bytes); */
669 index_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
671 mono_mb_emit_ldloc (mb, bytes_var);
672 mono_mb_emit_icon (mb, GRANULARITY - 1);
673 mono_mb_emit_byte (mb, MONO_CEE_ADD);
674 mono_mb_emit_icon (mb, shift_amount (GRANULARITY));
675 mono_mb_emit_byte (mb, MONO_CEE_SHR_UN);
676 mono_mb_emit_icon (mb, shift_amount (sizeof (gpointer)));
677 mono_mb_emit_byte (mb, MONO_CEE_SHL);
678 /* index var is already adjusted into bytes */
679 mono_mb_emit_stloc (mb, index_var);
681 my_fl_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
682 my_entry_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
683 /* my_fl = ((GC_thread)tsd) -> ptrfree_freelists + index; */
684 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
685 mono_mb_emit_byte (mb, 0x0D); /* CEE_MONO_TLS */
686 mono_mb_emit_i4 (mb, offset);
687 if (atype == ATYPE_FREEPTR || atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING)
688 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, ptrfree_freelists));
689 else if (atype == ATYPE_NORMAL)
690 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, normal_freelists));
691 else if (atype == ATYPE_GCJ)
692 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, gcj_freelists));
694 g_assert_not_reached ();
695 mono_mb_emit_byte (mb, MONO_CEE_ADD);
696 mono_mb_emit_ldloc (mb, index_var);
697 mono_mb_emit_byte (mb, MONO_CEE_ADD);
698 mono_mb_emit_stloc (mb, my_fl_var);
700 /* my_entry = *my_fl; */
701 mono_mb_emit_ldloc (mb, my_fl_var);
702 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
703 mono_mb_emit_stloc (mb, my_entry_var);
705 /* if (EXPECT((word)my_entry >= HBLKSIZE, 1)) { */
706 mono_mb_emit_ldloc (mb, my_entry_var);
707 mono_mb_emit_icon (mb, HBLKSIZE);
708 no_freelist_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
710 /* ptr_t next = obj_link(my_entry); *my_fl = next; */
711 mono_mb_emit_ldloc (mb, my_fl_var);
712 mono_mb_emit_ldloc (mb, my_entry_var);
713 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
714 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
716 /* set the vtable and clear the words in the object */
717 mono_mb_emit_ldloc (mb, my_entry_var);
718 mono_mb_emit_ldarg (mb, 0);
719 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
721 if (atype == ATYPE_FREEPTR) {
722 int start_var, end_var, start_loop;
723 /* end = my_entry + bytes; start = my_entry + sizeof (gpointer);
725 start_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
726 end_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
727 mono_mb_emit_ldloc (mb, my_entry_var);
728 mono_mb_emit_ldloc (mb, bytes_var);
729 mono_mb_emit_byte (mb, MONO_CEE_ADD);
730 mono_mb_emit_stloc (mb, end_var);
731 mono_mb_emit_ldloc (mb, my_entry_var);
732 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
733 mono_mb_emit_byte (mb, MONO_CEE_ADD);
734 mono_mb_emit_stloc (mb, start_var);
738 * } while (start < end);
740 start_loop = mono_mb_get_label (mb);
741 mono_mb_emit_ldloc (mb, start_var);
742 mono_mb_emit_icon (mb, 0);
743 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
744 mono_mb_emit_ldloc (mb, start_var);
745 mono_mb_emit_icon (mb, sizeof (gpointer));
746 mono_mb_emit_byte (mb, MONO_CEE_ADD);
747 mono_mb_emit_stloc (mb, start_var);
749 mono_mb_emit_ldloc (mb, start_var);
750 mono_mb_emit_ldloc (mb, end_var);
751 mono_mb_emit_byte (mb, MONO_CEE_BLT_UN_S);
752 mono_mb_emit_byte (mb, start_loop - (mono_mb_get_label (mb) + 1));
753 } else if (atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING) {
754 /* need to clear just the sync pointer */
755 mono_mb_emit_ldloc (mb, my_entry_var);
756 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
757 mono_mb_emit_byte (mb, MONO_CEE_ADD);
758 mono_mb_emit_icon (mb, 0);
759 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
762 if (atype == ATYPE_STRING) {
763 /* need to set length and clear the last char */
764 /* s->length = len; */
765 mono_mb_emit_ldloc (mb, my_entry_var);
766 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, length));
767 mono_mb_emit_byte (mb, MONO_CEE_ADD);
768 mono_mb_emit_ldarg (mb, 1);
769 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
770 /* s->chars [len] = 0; */
771 mono_mb_emit_ldloc (mb, my_entry_var);
772 mono_mb_emit_ldloc (mb, bytes_var);
773 mono_mb_emit_icon (mb, 2);
774 mono_mb_emit_byte (mb, MONO_CEE_SUB);
775 mono_mb_emit_byte (mb, MONO_CEE_ADD);
776 mono_mb_emit_icon (mb, 0);
777 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
780 /* return my_entry; */
781 mono_mb_emit_ldloc (mb, my_entry_var);
782 mono_mb_emit_byte (mb, MONO_CEE_RET);
784 mono_mb_patch_short_branch (mb, no_freelist_branch);
785 if (not_small_enough_branch > 0)
786 mono_mb_patch_short_branch (mb, not_small_enough_branch);
787 if (size_overflow_branch > 0)
788 mono_mb_patch_short_branch (mb, size_overflow_branch);
789 /* the slow path: we just call back into the runtime */
790 if (atype == ATYPE_STRING) {
791 mono_mb_emit_ldarg (mb, 1);
792 mono_mb_emit_icall (mb, mono_string_alloc);
794 mono_mb_emit_ldarg (mb, 0);
795 mono_mb_emit_icall (mb, mono_object_new_specific);
798 mono_mb_emit_byte (mb, MONO_CEE_RET);
800 res = mono_mb_create_method (mb, csig, 8);
802 mono_method_get_header (res)->init_locals = FALSE;
804 info = mono_image_alloc0 (mono_defaults.corlib, sizeof (AllocatorWrapperInfo));
805 info->alloc_type = atype;
806 mono_marshal_set_wrapper_info (res, info);
811 static MonoMethod* alloc_method_cache [ATYPE_NUM];
814 * If possible, generate a managed method that can quickly allocate objects in class
815 * @klass. The method will typically have an thread-local inline allocation sequence.
816 * The signature of the called method is:
817 * object allocate (MonoVTable *vtable)
818 * Some of the logic here is similar to mono_class_get_allocation_ftn () i object.c,
820 * The thread local alloc logic is taken from libgc/pthread_support.c.
824 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
828 MonoClass *klass = vtable->klass;
829 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
831 /*g_print ("thread tls: %d\n", offset);*/
834 if (!SMALL_ENOUGH (klass->instance_size))
836 if (klass->has_finalize || klass->marshalbyref || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
840 if (klass->byval_arg.type == MONO_TYPE_STRING) {
841 atype = ATYPE_STRING;
842 } else if (!klass->has_references) {
844 atype = ATYPE_FREEPTR_FOR_BOX;
846 atype = ATYPE_FREEPTR;
850 * disabled because we currently do a runtime choice anyway, to
851 * deal with multiple appdomains.
852 if (vtable->gc_descr != GC_NO_DESCRIPTOR)
855 atype = ATYPE_NORMAL;
858 return mono_gc_get_managed_allocator_by_type (atype);
862 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
868 * mono_gc_get_managed_allocator_by_type:
870 * Return a managed allocator method corresponding to allocator type ATYPE.
873 mono_gc_get_managed_allocator_by_type (int atype)
877 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
880 res = alloc_method_cache [atype];
882 res = alloc_method_cache [atype] = create_allocator (atype, offset);
883 mono_loader_unlock ();
888 mono_gc_get_managed_allocator_types (void)
894 mono_gc_get_write_barrier (void)
896 g_assert_not_reached ();
903 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
909 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
915 mono_gc_get_managed_allocator_by_type (int atype)
921 mono_gc_get_managed_allocator_types (void)
927 mono_gc_get_write_barrier (void)
929 g_assert_not_reached ();
935 #endif /* no Boehm GC */