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/utils/mono-logger.h>
20 #include <mono/utils/mono-time.h>
21 #include <mono/utils/dtrace.h>
25 #ifdef USE_INCLUDED_LIBGC
28 #define THREAD_LOCAL_ALLOC 1
29 #include "private/pthread_support.h"
32 #define GC_NO_DESCRIPTOR ((gpointer)(0 | GC_DS_LENGTH))
34 static gboolean gc_initialized = FALSE;
37 mono_gc_warning (char *msg, GC_word arg)
39 mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_GC, msg, (unsigned long)arg);
43 mono_gc_base_init (void)
49 * Handle the case when we are called from a thread different from the main thread,
51 * FIXME: Move this to libgc where it belongs.
53 * we used to do this only when running on valgrind,
54 * but it happens also in other setups.
56 #if defined(HAVE_PTHREAD_GETATTR_NP) && defined(HAVE_PTHREAD_ATTR_GETSTACK)
61 pthread_getattr_np (pthread_self (), &attr);
62 pthread_attr_getstack (&attr, &sstart, &size);
63 pthread_attr_destroy (&attr);
64 /*g_print ("stackbottom pth is: %p\n", (char*)sstart + size);*/
67 * The calculation above doesn't seem to work on ia64, also we need to set
68 * GC_register_stackbottom as well, but don't know how.
71 /* apparently with some linuxthreads implementations sstart can be NULL,
72 * fallback to the more imprecise method (bug# 78096).
75 GC_stackbottom = (char*)sstart + size;
78 gsize stack_bottom = (gsize)&dummy;
80 stack_bottom &= ~4095;
81 GC_stackbottom = (char*)stack_bottom;
85 #elif defined(HAVE_PTHREAD_GET_STACKSIZE_NP) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
86 GC_stackbottom = (char*)pthread_get_stackaddr_np (pthread_self ());
90 gsize stack_bottom = (gsize)&dummy;
92 stack_bottom &= ~4095;
93 /*g_print ("stackbottom is: %p\n", (char*)stack_bottom);*/
94 GC_stackbottom = (char*)stack_bottom;
100 GC_oom_fn = mono_gc_out_of_memory;
101 GC_set_warn_proc (mono_gc_warning);
102 GC_finalize_on_demand = 1;
103 GC_finalizer_notifier = mono_gc_finalize_notify;
105 #ifdef HAVE_GC_GCJ_MALLOC
106 GC_init_gcj_malloc (5, NULL);
108 mono_gc_enable_events ();
109 gc_initialized = TRUE;
113 mono_gc_collect (int generation)
115 MONO_PROBE_GC_BEGIN (generation);
117 mono_perfcounters->gc_induced++;
120 MONO_PROBE_GC_END (generation);
121 #if defined(ENABLE_DTRACE) && defined(__sun__)
122 /* This works around a dtrace -G problem on Solaris.
123 Limit its actual use to when the probe is enabled. */
124 if (MONO_PROBE_GC_END_ENABLED ())
130 mono_gc_max_generation (void)
136 mono_gc_get_generation (MonoObject *object)
142 mono_gc_collection_count (int generation)
148 mono_gc_add_memory_pressure (gint64 value)
153 mono_gc_get_used_size (void)
155 return GC_get_heap_size () - GC_get_free_bytes ();
159 mono_gc_get_heap_size (void)
161 return GC_get_heap_size ();
165 mono_gc_disable (void)
167 #ifdef HAVE_GC_ENABLE
170 g_assert_not_reached ();
175 mono_gc_enable (void)
177 #ifdef HAVE_GC_ENABLE
180 g_assert_not_reached ();
185 mono_gc_is_gc_thread (void)
187 #if GC_VERSION_MAJOR >= 7
189 #elif defined(USE_INCLUDED_LIBGC)
190 return GC_thread_is_registered ();
196 extern int GC_thread_register_foreign (void *base_addr);
199 mono_gc_register_thread (void *baseptr)
201 #if GC_VERSION_MAJOR >= 7
202 struct GC_stack_base sb;
205 res = GC_get_stack_base (&sb);
206 if (res != GC_SUCCESS) {
207 sb.mem_base = baseptr;
209 /* Can't determine the register stack bounds */
210 g_error ("mono_gc_register_thread failed ().\n");
213 res = GC_register_my_thread (&sb);
214 if ((res != GC_SUCCESS) && (res != GC_DUPLICATE)) {
215 g_warning ("GC_register_my_thread () failed.\n");
220 if (mono_gc_is_gc_thread())
222 #if defined(USE_INCLUDED_LIBGC) && !defined(PLATFORM_WIN32)
223 return GC_thread_register_foreign (baseptr);
231 mono_object_is_alive (MonoObject* o)
233 #ifdef USE_INCLUDED_LIBGC
234 return GC_is_marked ((gpointer)o);
240 #ifdef USE_INCLUDED_LIBGC
242 static gint64 gc_start_time;
245 on_gc_notification (GCEventType event)
247 if (event == MONO_GC_EVENT_START) {
248 mono_perfcounters->gc_collections0++;
249 mono_stats.major_gc_count ++;
250 gc_start_time = mono_100ns_ticks ();
251 } else if (event == MONO_GC_EVENT_END) {
252 guint64 heap_size = GC_get_heap_size ();
253 guint64 used_size = heap_size - GC_get_free_bytes ();
254 mono_perfcounters->gc_total_bytes = used_size;
255 mono_perfcounters->gc_committed_bytes = heap_size;
256 mono_perfcounters->gc_reserved_bytes = heap_size;
257 mono_perfcounters->gc_gen0size = heap_size;
258 mono_stats.major_gc_time_usecs += (mono_100ns_ticks () - gc_start_time) / 10;
259 mono_trace_message (MONO_TRACE_GC, "gc took %d usecs", (mono_100ns_ticks () - gc_start_time) / 10);
261 mono_profiler_gc_event ((MonoGCEvent) event, 0);
265 on_gc_heap_resize (size_t new_size)
267 guint64 heap_size = GC_get_heap_size ();
268 mono_perfcounters->gc_committed_bytes = heap_size;
269 mono_perfcounters->gc_reserved_bytes = heap_size;
270 mono_perfcounters->gc_gen0size = heap_size;
271 mono_profiler_gc_heap_resize (new_size);
275 mono_gc_enable_events (void)
277 GC_notify_event = on_gc_notification;
278 GC_on_heap_resize = on_gc_heap_resize;
284 mono_gc_enable_events (void)
291 mono_gc_register_root (char *start, size_t size, void *descr)
293 /* for some strange reason, they want one extra byte on the end */
294 GC_add_roots (start, start + size + 1);
300 mono_gc_deregister_root (char* addr)
302 #ifndef PLATFORM_WIN32
303 /* FIXME: libgc doesn't define this work win32 for some reason */
304 /* FIXME: No size info */
305 GC_remove_roots (addr, addr + sizeof (gpointer) + 1);
310 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
312 /* libgc requires that we use HIDE_POINTER... */
313 *link_addr = (void*)HIDE_POINTER (obj);
314 GC_GENERAL_REGISTER_DISAPPEARING_LINK (link_addr, obj);
318 mono_gc_weak_link_remove (void **link_addr)
320 GC_unregister_disappearing_link (link_addr);
325 mono_gc_weak_link_get (void **link_addr)
327 MonoObject *obj = REVEAL_POINTER (*link_addr);
328 if (obj == (MonoObject *) -1)
334 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
336 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
340 mono_gc_make_descr_for_object (gsize *bitmap, int numbits, size_t obj_size)
342 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
346 mono_gc_make_descr_for_array (int vector, gsize *elem_bitmap, int numbits, size_t elem_size)
348 /* libgc has no usable support for arrays... */
349 return GC_NO_DESCRIPTOR;
353 mono_gc_make_descr_from_bitmap (gsize *bitmap, int numbits)
355 #ifdef HAVE_GC_GCJ_MALLOC
356 /* It seems there are issues when the bitmap doesn't fit: play it safe */
358 return GC_NO_DESCRIPTOR;
360 return (gpointer)GC_make_descriptor ((GC_bitmap)bitmap, numbits);
367 mono_gc_alloc_fixed (size_t size, void *descr)
369 /* To help track down typed allocation bugs */
373 if (count == atoi (getenv ("COUNT2")))
375 if (count > atoi (getenv ("COUNT2")))
376 return GC_MALLOC (size);
380 return GC_MALLOC_EXPLICITLY_TYPED (size, (GC_descr)descr);
382 return GC_MALLOC (size);
386 mono_gc_free_fixed (void* addr)
391 mono_gc_invoke_finalizers (void)
393 /* There is a bug in GC_invoke_finalizer () in versions <= 6.2alpha4:
394 * the 'mem_freed' variable is not initialized when there are no
395 * objects to finalize, which leads to strange behavior later on.
396 * The check is necessary to work around that bug.
398 if (GC_should_invoke_finalizers ())
399 return GC_invoke_finalizers ();
404 mono_gc_pending_finalizers (void)
406 return GC_should_invoke_finalizers ();
410 * LOCKING: Assumes the domain_finalizers lock is held.
413 add_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
417 if (!domain->track_resurrection_objects_hash)
418 domain->track_resurrection_objects_hash = g_hash_table_new (mono_aligned_addr_hash, NULL);
420 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
421 refs = g_slist_prepend (refs, GUINT_TO_POINTER (gchandle));
422 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
426 mono_gc_add_weak_track_handle (MonoObject *obj, guint32 handle)
433 domain = mono_object_get_domain (obj);
435 mono_domain_finalizers_lock (domain);
437 add_weak_track_handle_internal (domain, obj, handle);
439 g_hash_table_insert (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (handle), obj);
441 mono_domain_finalizers_unlock (domain);
445 * LOCKING: Assumes the domain_finalizers lock is held.
448 remove_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
452 if (!domain->track_resurrection_objects_hash)
455 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
456 refs = g_slist_remove (refs, GUINT_TO_POINTER (gchandle));
457 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
461 mono_gc_change_weak_track_handle (MonoObject *old_obj, MonoObject *obj, guint32 gchandle)
463 MonoDomain *domain = mono_domain_get ();
465 mono_domain_finalizers_lock (domain);
468 remove_weak_track_handle_internal (domain, old_obj, gchandle);
470 add_weak_track_handle_internal (domain, obj, gchandle);
472 mono_domain_finalizers_unlock (domain);
476 mono_gc_remove_weak_track_handle (guint32 gchandle)
478 MonoDomain *domain = mono_domain_get ();
481 /* Clean our entries in the two hashes in MonoDomain */
483 mono_domain_finalizers_lock (domain);
485 /* Get the original object this handle pointed to */
486 obj = g_hash_table_lookup (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
488 g_hash_table_remove (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
490 remove_weak_track_handle_internal (domain, obj, gchandle);
493 mono_domain_finalizers_unlock (domain);
497 mono_gc_remove_weak_track_object (MonoDomain *domain, MonoObject *obj)
501 if (domain->track_resurrection_objects_hash) {
502 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
506 * Since we don't run finalizers again for resurrected objects,
507 * no need to keep these around.
509 g_hash_table_remove (domain->track_resurrection_objects_hash, obj);
516 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
518 *(void**)field_ptr = value;
522 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
524 *(void**)slot_ptr = value;
528 mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
530 memmove (dest_ptr, src_ptr, count * sizeof (gpointer));
534 mono_gc_wbarrier_generic_store (gpointer ptr, MonoObject* value)
536 *(void**)ptr = value;
540 mono_gc_wbarrier_generic_nostore (gpointer ptr)
545 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
547 memmove (dest, src, count * mono_class_value_size (klass, NULL));
551 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
553 /* do not copy the sync state */
554 memcpy ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
555 mono_object_class (obj)->instance_size - sizeof (MonoObject));
559 mono_gc_clear_domain (MonoDomain *domain)
564 mono_gc_get_suspend_signal (void)
566 return GC_get_suspend_signal ();
569 #if defined(USE_INCLUDED_LIBGC) && defined(USE_COMPILER_TLS) && defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
570 extern __thread MONO_TLS_FAST void* GC_thread_tls;
571 #include "metadata-internals.h"
577 while (!(v & (1 << i)))
584 ATYPE_FREEPTR_FOR_BOX,
592 create_allocator (int atype, int offset)
594 int index_var, bytes_var, my_fl_var, my_entry_var;
595 guint32 no_freelist_branch, not_small_enough_branch = 0;
596 guint32 size_overflow_branch = 0;
597 MonoMethodBuilder *mb;
599 MonoMethodSignature *csig;
601 if (atype == ATYPE_STRING) {
602 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
603 csig->ret = &mono_defaults.string_class->byval_arg;
604 csig->params [0] = &mono_defaults.int_class->byval_arg;
605 csig->params [1] = &mono_defaults.int32_class->byval_arg;
607 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
608 csig->ret = &mono_defaults.object_class->byval_arg;
609 csig->params [0] = &mono_defaults.int_class->byval_arg;
612 mb = mono_mb_new (mono_defaults.object_class, "Alloc", MONO_WRAPPER_ALLOC);
613 bytes_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
614 if (atype == ATYPE_STRING) {
615 /* a string alloator method takes the args: (vtable, len) */
616 /* bytes = (sizeof (MonoString) + ((len + 1) * 2)); */
617 mono_mb_emit_ldarg (mb, 1);
618 mono_mb_emit_icon (mb, 1);
619 mono_mb_emit_byte (mb, MONO_CEE_ADD);
620 mono_mb_emit_icon (mb, 1);
621 mono_mb_emit_byte (mb, MONO_CEE_SHL);
622 // sizeof (MonoString) might include padding
623 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, chars));
624 mono_mb_emit_byte (mb, MONO_CEE_ADD);
625 mono_mb_emit_stloc (mb, bytes_var);
627 /* bytes = vtable->klass->instance_size */
628 mono_mb_emit_ldarg (mb, 0);
629 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoVTable, klass));
630 mono_mb_emit_byte (mb, MONO_CEE_ADD);
631 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
632 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoClass, instance_size));
633 mono_mb_emit_byte (mb, MONO_CEE_ADD);
634 /* FIXME: assert instance_size stays a 4 byte integer */
635 mono_mb_emit_byte (mb, MONO_CEE_LDIND_U4);
636 mono_mb_emit_stloc (mb, bytes_var);
639 /* this is needed for strings/arrays only as the other big types are never allocated with this method */
640 if (atype == ATYPE_STRING) {
642 /* if (!SMALL_ENOUGH (bytes)) jump slow_path;*/
643 mono_mb_emit_ldloc (mb, bytes_var);
644 mono_mb_emit_icon (mb, (NFREELISTS-1) * GRANULARITY);
645 not_small_enough_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
646 /* check for overflow */
647 mono_mb_emit_ldloc (mb, bytes_var);
648 mono_mb_emit_icon (mb, sizeof (MonoString));
649 size_overflow_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
652 /* int index = INDEX_FROM_BYTES(bytes); */
653 index_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
655 mono_mb_emit_ldloc (mb, bytes_var);
656 mono_mb_emit_icon (mb, GRANULARITY - 1);
657 mono_mb_emit_byte (mb, MONO_CEE_ADD);
658 mono_mb_emit_icon (mb, shift_amount (GRANULARITY));
659 mono_mb_emit_byte (mb, MONO_CEE_SHR_UN);
660 mono_mb_emit_icon (mb, shift_amount (sizeof (gpointer)));
661 mono_mb_emit_byte (mb, MONO_CEE_SHL);
662 /* index var is already adjusted into bytes */
663 mono_mb_emit_stloc (mb, index_var);
665 my_fl_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
666 my_entry_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
667 /* my_fl = ((GC_thread)tsd) -> ptrfree_freelists + index; */
668 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
669 mono_mb_emit_byte (mb, 0x0D); /* CEE_MONO_TLS */
670 mono_mb_emit_i4 (mb, offset);
671 if (atype == ATYPE_FREEPTR || atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING)
672 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, ptrfree_freelists));
673 else if (atype == ATYPE_NORMAL)
674 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, normal_freelists));
675 else if (atype == ATYPE_GCJ)
676 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, gcj_freelists));
678 g_assert_not_reached ();
679 mono_mb_emit_byte (mb, MONO_CEE_ADD);
680 mono_mb_emit_ldloc (mb, index_var);
681 mono_mb_emit_byte (mb, MONO_CEE_ADD);
682 mono_mb_emit_stloc (mb, my_fl_var);
684 /* my_entry = *my_fl; */
685 mono_mb_emit_ldloc (mb, my_fl_var);
686 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
687 mono_mb_emit_stloc (mb, my_entry_var);
689 /* if (EXPECT((word)my_entry >= HBLKSIZE, 1)) { */
690 mono_mb_emit_ldloc (mb, my_entry_var);
691 mono_mb_emit_icon (mb, HBLKSIZE);
692 no_freelist_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
694 /* ptr_t next = obj_link(my_entry); *my_fl = next; */
695 mono_mb_emit_ldloc (mb, my_fl_var);
696 mono_mb_emit_ldloc (mb, my_entry_var);
697 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
698 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
700 /* set the vtable and clear the words in the object */
701 mono_mb_emit_ldloc (mb, my_entry_var);
702 mono_mb_emit_ldarg (mb, 0);
703 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
705 if (atype == ATYPE_FREEPTR) {
706 int start_var, end_var, start_loop;
707 /* end = my_entry + bytes; start = my_entry + sizeof (gpointer);
709 start_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
710 end_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
711 mono_mb_emit_ldloc (mb, my_entry_var);
712 mono_mb_emit_ldloc (mb, bytes_var);
713 mono_mb_emit_byte (mb, MONO_CEE_ADD);
714 mono_mb_emit_stloc (mb, end_var);
715 mono_mb_emit_ldloc (mb, my_entry_var);
716 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
717 mono_mb_emit_byte (mb, MONO_CEE_ADD);
718 mono_mb_emit_stloc (mb, start_var);
722 * } while (start < end);
724 start_loop = mono_mb_get_label (mb);
725 mono_mb_emit_ldloc (mb, start_var);
726 mono_mb_emit_icon (mb, 0);
727 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
728 mono_mb_emit_ldloc (mb, start_var);
729 mono_mb_emit_icon (mb, sizeof (gpointer));
730 mono_mb_emit_byte (mb, MONO_CEE_ADD);
731 mono_mb_emit_stloc (mb, start_var);
733 mono_mb_emit_ldloc (mb, start_var);
734 mono_mb_emit_ldloc (mb, end_var);
735 mono_mb_emit_byte (mb, MONO_CEE_BLT_UN_S);
736 mono_mb_emit_byte (mb, start_loop - (mono_mb_get_label (mb) + 1));
737 } else if (atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING) {
738 /* need to clear just the sync pointer */
739 mono_mb_emit_ldloc (mb, my_entry_var);
740 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
741 mono_mb_emit_byte (mb, MONO_CEE_ADD);
742 mono_mb_emit_icon (mb, 0);
743 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
746 if (atype == ATYPE_STRING) {
747 /* need to set length and clear the last char */
748 /* s->length = len; */
749 mono_mb_emit_ldloc (mb, my_entry_var);
750 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, length));
751 mono_mb_emit_byte (mb, MONO_CEE_ADD);
752 mono_mb_emit_ldarg (mb, 1);
753 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
754 /* s->chars [len] = 0; */
755 mono_mb_emit_ldloc (mb, my_entry_var);
756 mono_mb_emit_ldloc (mb, bytes_var);
757 mono_mb_emit_icon (mb, 2);
758 mono_mb_emit_byte (mb, MONO_CEE_SUB);
759 mono_mb_emit_byte (mb, MONO_CEE_ADD);
760 mono_mb_emit_icon (mb, 0);
761 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
764 /* return my_entry; */
765 mono_mb_emit_ldloc (mb, my_entry_var);
766 mono_mb_emit_byte (mb, MONO_CEE_RET);
768 mono_mb_patch_short_branch (mb, no_freelist_branch);
769 if (not_small_enough_branch > 0)
770 mono_mb_patch_short_branch (mb, not_small_enough_branch);
771 if (size_overflow_branch > 0)
772 mono_mb_patch_short_branch (mb, size_overflow_branch);
773 /* the slow path: we just call back into the runtime */
774 if (atype == ATYPE_STRING) {
775 mono_mb_emit_ldarg (mb, 1);
776 mono_mb_emit_icall (mb, mono_string_alloc);
778 mono_mb_emit_ldarg (mb, 0);
779 mono_mb_emit_icall (mb, mono_object_new_specific);
782 mono_mb_emit_byte (mb, MONO_CEE_RET);
784 res = mono_mb_create_method (mb, csig, 8);
786 mono_method_get_header (res)->init_locals = FALSE;
790 static MonoMethod* alloc_method_cache [ATYPE_NUM];
793 * If possible, generate a managed method that can quickly allocate objects in class
794 * @klass. The method will typically have an thread-local inline allocation sequence.
795 * The signature of the called method is:
796 * object allocate (MonoVTable *vtable)
797 * Some of the logic here is similar to mono_class_get_allocation_ftn () i object.c,
799 * The thread local alloc logic is taken from libgc/pthread_support.c.
803 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
807 MonoClass *klass = vtable->klass;
808 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
810 /*g_print ("thread tls: %d\n", offset);*/
813 if (!SMALL_ENOUGH (klass->instance_size))
815 if (klass->has_finalize || klass->marshalbyref || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
819 if (klass->byval_arg.type == MONO_TYPE_STRING) {
820 atype = ATYPE_STRING;
821 } else if (!klass->has_references) {
823 atype = ATYPE_FREEPTR_FOR_BOX;
825 atype = ATYPE_FREEPTR;
829 * disabled because we currently do a runtime choice anyway, to
830 * deal with multiple appdomains.
831 if (vtable->gc_descr != GC_NO_DESCRIPTOR)
834 atype = ATYPE_NORMAL;
837 return mono_gc_get_managed_allocator_by_type (atype);
841 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
847 * mono_gc_get_managed_allocator_id:
849 * Return a type for the managed allocator method MANAGED_ALLOC which can later be passed
850 * to mono_gc_get_managed_allocator_by_type () to get back this allocator method. This can be
851 * used by the AOT code to encode references to managed allocator methods.
854 mono_gc_get_managed_allocator_type (MonoMethod *managed_alloc)
859 for (i = 0; i < ATYPE_NUM; ++i) {
860 if (alloc_method_cache [i] == managed_alloc) {
861 mono_loader_unlock ();
865 mono_loader_unlock ();
871 * mono_gc_get_managed_allocator_by_type:
873 * Return a managed allocator method corresponding to allocator type ATYPE.
876 mono_gc_get_managed_allocator_by_type (int atype)
880 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
883 res = alloc_method_cache [atype];
885 res = alloc_method_cache [atype] = create_allocator (atype, offset);
886 mono_loader_unlock ();
891 mono_gc_get_managed_allocator_types (void)
899 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
905 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
911 mono_gc_get_managed_allocator_type (MonoMethod *managed_alloc)
917 mono_gc_get_managed_allocator_by_type (int atype)
923 mono_gc_get_managed_allocator_types (void)
930 #endif /* no Boehm GC */