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;
98 #if !defined(PLATFORM_ANDROID)
99 /* If GC_no_dls is set to true, GC_find_limit is not called. This causes a seg fault on Android. */
103 GC_oom_fn = mono_gc_out_of_memory;
104 GC_set_warn_proc (mono_gc_warning);
105 GC_finalize_on_demand = 1;
106 GC_finalizer_notifier = mono_gc_finalize_notify;
108 #ifdef HAVE_GC_GCJ_MALLOC
109 GC_init_gcj_malloc (5, NULL);
111 mono_gc_enable_events ();
112 gc_initialized = TRUE;
116 mono_gc_collect (int generation)
118 MONO_PROBE_GC_BEGIN (generation);
120 mono_perfcounters->gc_induced++;
123 MONO_PROBE_GC_END (generation);
124 #if defined(ENABLE_DTRACE) && defined(__sun__)
125 /* This works around a dtrace -G problem on Solaris.
126 Limit its actual use to when the probe is enabled. */
127 if (MONO_PROBE_GC_END_ENABLED ())
133 mono_gc_max_generation (void)
139 mono_gc_get_generation (MonoObject *object)
145 mono_gc_collection_count (int generation)
151 mono_gc_add_memory_pressure (gint64 value)
156 mono_gc_get_used_size (void)
158 return GC_get_heap_size () - GC_get_free_bytes ();
162 mono_gc_get_heap_size (void)
164 return GC_get_heap_size ();
168 mono_gc_disable (void)
170 #ifdef HAVE_GC_ENABLE
173 g_assert_not_reached ();
178 mono_gc_enable (void)
180 #ifdef HAVE_GC_ENABLE
183 g_assert_not_reached ();
188 mono_gc_is_gc_thread (void)
190 #if GC_VERSION_MAJOR >= 7
192 #elif defined(USE_INCLUDED_LIBGC)
193 return GC_thread_is_registered ();
199 extern int GC_thread_register_foreign (void *base_addr);
202 mono_gc_register_thread (void *baseptr)
204 #if GC_VERSION_MAJOR >= 7
205 struct GC_stack_base sb;
208 res = GC_get_stack_base (&sb);
209 if (res != GC_SUCCESS) {
210 sb.mem_base = baseptr;
212 /* Can't determine the register stack bounds */
213 g_error ("mono_gc_register_thread failed ().\n");
216 res = GC_register_my_thread (&sb);
217 if ((res != GC_SUCCESS) && (res != GC_DUPLICATE)) {
218 g_warning ("GC_register_my_thread () failed.\n");
223 if (mono_gc_is_gc_thread())
225 #if defined(USE_INCLUDED_LIBGC) && !defined(HOST_WIN32)
226 return GC_thread_register_foreign (baseptr);
234 mono_object_is_alive (MonoObject* o)
236 #ifdef USE_INCLUDED_LIBGC
237 return GC_is_marked ((gpointer)o);
243 #ifdef USE_INCLUDED_LIBGC
245 static gint64 gc_start_time;
248 on_gc_notification (GCEventType event)
250 if (event == MONO_GC_EVENT_START) {
251 mono_perfcounters->gc_collections0++;
252 mono_stats.major_gc_count ++;
253 gc_start_time = mono_100ns_ticks ();
254 } else if (event == MONO_GC_EVENT_END) {
255 guint64 heap_size = GC_get_heap_size ();
256 guint64 used_size = heap_size - GC_get_free_bytes ();
257 mono_perfcounters->gc_total_bytes = used_size;
258 mono_perfcounters->gc_committed_bytes = heap_size;
259 mono_perfcounters->gc_reserved_bytes = heap_size;
260 mono_perfcounters->gc_gen0size = heap_size;
261 mono_stats.major_gc_time_usecs += (mono_100ns_ticks () - gc_start_time) / 10;
262 mono_trace_message (MONO_TRACE_GC, "gc took %d usecs", (mono_100ns_ticks () - gc_start_time) / 10);
264 mono_profiler_gc_event ((MonoGCEvent) event, 0);
268 on_gc_heap_resize (size_t new_size)
270 guint64 heap_size = GC_get_heap_size ();
271 mono_perfcounters->gc_committed_bytes = heap_size;
272 mono_perfcounters->gc_reserved_bytes = heap_size;
273 mono_perfcounters->gc_gen0size = heap_size;
274 mono_profiler_gc_heap_resize (new_size);
278 mono_gc_enable_events (void)
280 GC_notify_event = on_gc_notification;
281 GC_on_heap_resize = on_gc_heap_resize;
287 mono_gc_enable_events (void)
294 mono_gc_register_root (char *start, size_t size, void *descr)
296 /* for some strange reason, they want one extra byte on the end */
297 GC_add_roots (start, start + size + 1);
303 mono_gc_deregister_root (char* addr)
306 /* FIXME: libgc doesn't define this work win32 for some reason */
307 /* FIXME: No size info */
308 GC_remove_roots (addr, addr + sizeof (gpointer) + 1);
313 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
315 /* libgc requires that we use HIDE_POINTER... */
316 *link_addr = (void*)HIDE_POINTER (obj);
317 GC_GENERAL_REGISTER_DISAPPEARING_LINK (link_addr, obj);
321 mono_gc_weak_link_remove (void **link_addr)
323 GC_unregister_disappearing_link (link_addr);
328 reveal_link (gpointer link_addr)
330 void **link_a = link_addr;
331 return REVEAL_POINTER (*link_a);
335 mono_gc_weak_link_get (void **link_addr)
337 MonoObject *obj = GC_call_with_alloc_lock (reveal_link, link_addr);
338 if (obj == (MonoObject *) -1)
344 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
346 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
350 mono_gc_make_descr_for_object (gsize *bitmap, int numbits, size_t obj_size)
352 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
356 mono_gc_make_descr_for_array (int vector, gsize *elem_bitmap, int numbits, size_t elem_size)
358 /* libgc has no usable support for arrays... */
359 return GC_NO_DESCRIPTOR;
363 mono_gc_make_descr_from_bitmap (gsize *bitmap, int numbits)
365 #ifdef HAVE_GC_GCJ_MALLOC
366 /* It seems there are issues when the bitmap doesn't fit: play it safe */
368 return GC_NO_DESCRIPTOR;
370 return (gpointer)GC_make_descriptor ((GC_bitmap)bitmap, numbits);
377 mono_gc_alloc_fixed (size_t size, void *descr)
379 /* To help track down typed allocation bugs */
383 if (count == atoi (getenv ("COUNT2")))
385 if (count > atoi (getenv ("COUNT2")))
386 return GC_MALLOC (size);
390 return GC_MALLOC_EXPLICITLY_TYPED (size, (GC_descr)descr);
392 return GC_MALLOC (size);
396 mono_gc_free_fixed (void* addr)
401 mono_gc_invoke_finalizers (void)
403 /* There is a bug in GC_invoke_finalizer () in versions <= 6.2alpha4:
404 * the 'mem_freed' variable is not initialized when there are no
405 * objects to finalize, which leads to strange behavior later on.
406 * The check is necessary to work around that bug.
408 if (GC_should_invoke_finalizers ())
409 return GC_invoke_finalizers ();
414 mono_gc_pending_finalizers (void)
416 return GC_should_invoke_finalizers ();
420 * LOCKING: Assumes the domain_finalizers lock is held.
423 add_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
427 if (!domain->track_resurrection_objects_hash)
428 domain->track_resurrection_objects_hash = g_hash_table_new (mono_aligned_addr_hash, NULL);
430 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
431 refs = g_slist_prepend (refs, GUINT_TO_POINTER (gchandle));
432 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
436 mono_gc_add_weak_track_handle (MonoObject *obj, guint32 handle)
443 domain = mono_object_get_domain (obj);
445 mono_domain_finalizers_lock (domain);
447 add_weak_track_handle_internal (domain, obj, handle);
449 g_hash_table_insert (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (handle), obj);
451 mono_domain_finalizers_unlock (domain);
455 * LOCKING: Assumes the domain_finalizers lock is held.
458 remove_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
462 if (!domain->track_resurrection_objects_hash)
465 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
466 refs = g_slist_remove (refs, GUINT_TO_POINTER (gchandle));
467 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
471 mono_gc_change_weak_track_handle (MonoObject *old_obj, MonoObject *obj, guint32 gchandle)
473 MonoDomain *domain = mono_domain_get ();
475 mono_domain_finalizers_lock (domain);
478 remove_weak_track_handle_internal (domain, old_obj, gchandle);
480 add_weak_track_handle_internal (domain, obj, gchandle);
482 mono_domain_finalizers_unlock (domain);
486 mono_gc_remove_weak_track_handle (guint32 gchandle)
488 MonoDomain *domain = mono_domain_get ();
491 /* Clean our entries in the two hashes in MonoDomain */
493 mono_domain_finalizers_lock (domain);
495 /* Get the original object this handle pointed to */
496 obj = g_hash_table_lookup (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
498 g_hash_table_remove (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
500 remove_weak_track_handle_internal (domain, obj, gchandle);
503 mono_domain_finalizers_unlock (domain);
507 mono_gc_remove_weak_track_object (MonoDomain *domain, MonoObject *obj)
511 if (domain->track_resurrection_objects_hash) {
512 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
516 * Since we don't run finalizers again for resurrected objects,
517 * no need to keep these around.
519 g_hash_table_remove (domain->track_resurrection_objects_hash, obj);
526 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
528 *(void**)field_ptr = value;
532 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
534 *(void**)slot_ptr = value;
538 mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
540 memmove (dest_ptr, src_ptr, count * sizeof (gpointer));
544 mono_gc_wbarrier_generic_store (gpointer ptr, MonoObject* value)
546 *(void**)ptr = value;
550 mono_gc_wbarrier_generic_nostore (gpointer ptr)
555 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
557 memmove (dest, src, count * mono_class_value_size (klass, NULL));
561 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
563 /* do not copy the sync state */
564 memcpy ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
565 mono_object_class (obj)->instance_size - sizeof (MonoObject));
569 mono_gc_clear_domain (MonoDomain *domain)
574 mono_gc_get_suspend_signal (void)
576 #ifdef USE_INCLUDED_GC
577 return GC_get_suspend_signal ();
583 #if defined(USE_INCLUDED_LIBGC) && defined(USE_COMPILER_TLS) && defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
584 extern __thread MONO_TLS_FAST void* GC_thread_tls;
585 #include "metadata-internals.h"
591 while (!(v & (1 << i)))
598 ATYPE_FREEPTR_FOR_BOX,
606 create_allocator (int atype, int offset)
608 int index_var, bytes_var, my_fl_var, my_entry_var;
609 guint32 no_freelist_branch, not_small_enough_branch = 0;
610 guint32 size_overflow_branch = 0;
611 MonoMethodBuilder *mb;
613 MonoMethodSignature *csig;
614 AllocatorWrapperInfo *info;
616 if (atype == ATYPE_STRING) {
617 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
618 csig->ret = &mono_defaults.string_class->byval_arg;
619 csig->params [0] = &mono_defaults.int_class->byval_arg;
620 csig->params [1] = &mono_defaults.int32_class->byval_arg;
622 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
623 csig->ret = &mono_defaults.object_class->byval_arg;
624 csig->params [0] = &mono_defaults.int_class->byval_arg;
627 mb = mono_mb_new (mono_defaults.object_class, "Alloc", MONO_WRAPPER_ALLOC);
628 bytes_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
629 if (atype == ATYPE_STRING) {
630 /* a string alloator method takes the args: (vtable, len) */
631 /* bytes = (sizeof (MonoString) + ((len + 1) * 2)); */
632 mono_mb_emit_ldarg (mb, 1);
633 mono_mb_emit_icon (mb, 1);
634 mono_mb_emit_byte (mb, MONO_CEE_ADD);
635 mono_mb_emit_icon (mb, 1);
636 mono_mb_emit_byte (mb, MONO_CEE_SHL);
637 // sizeof (MonoString) might include padding
638 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, chars));
639 mono_mb_emit_byte (mb, MONO_CEE_ADD);
640 mono_mb_emit_stloc (mb, bytes_var);
642 /* bytes = vtable->klass->instance_size */
643 mono_mb_emit_ldarg (mb, 0);
644 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoVTable, klass));
645 mono_mb_emit_byte (mb, MONO_CEE_ADD);
646 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
647 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoClass, instance_size));
648 mono_mb_emit_byte (mb, MONO_CEE_ADD);
649 /* FIXME: assert instance_size stays a 4 byte integer */
650 mono_mb_emit_byte (mb, MONO_CEE_LDIND_U4);
651 mono_mb_emit_stloc (mb, bytes_var);
654 /* this is needed for strings/arrays only as the other big types are never allocated with this method */
655 if (atype == ATYPE_STRING) {
657 /* if (!SMALL_ENOUGH (bytes)) jump slow_path;*/
658 mono_mb_emit_ldloc (mb, bytes_var);
659 mono_mb_emit_icon (mb, (NFREELISTS-1) * GRANULARITY);
660 not_small_enough_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
661 /* check for overflow */
662 mono_mb_emit_ldloc (mb, bytes_var);
663 mono_mb_emit_icon (mb, sizeof (MonoString));
664 size_overflow_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
667 /* int index = INDEX_FROM_BYTES(bytes); */
668 index_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
670 mono_mb_emit_ldloc (mb, bytes_var);
671 mono_mb_emit_icon (mb, GRANULARITY - 1);
672 mono_mb_emit_byte (mb, MONO_CEE_ADD);
673 mono_mb_emit_icon (mb, shift_amount (GRANULARITY));
674 mono_mb_emit_byte (mb, MONO_CEE_SHR_UN);
675 mono_mb_emit_icon (mb, shift_amount (sizeof (gpointer)));
676 mono_mb_emit_byte (mb, MONO_CEE_SHL);
677 /* index var is already adjusted into bytes */
678 mono_mb_emit_stloc (mb, index_var);
680 my_fl_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
681 my_entry_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
682 /* my_fl = ((GC_thread)tsd) -> ptrfree_freelists + index; */
683 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
684 mono_mb_emit_byte (mb, 0x0D); /* CEE_MONO_TLS */
685 mono_mb_emit_i4 (mb, offset);
686 if (atype == ATYPE_FREEPTR || atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING)
687 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, ptrfree_freelists));
688 else if (atype == ATYPE_NORMAL)
689 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, normal_freelists));
690 else if (atype == ATYPE_GCJ)
691 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, gcj_freelists));
693 g_assert_not_reached ();
694 mono_mb_emit_byte (mb, MONO_CEE_ADD);
695 mono_mb_emit_ldloc (mb, index_var);
696 mono_mb_emit_byte (mb, MONO_CEE_ADD);
697 mono_mb_emit_stloc (mb, my_fl_var);
699 /* my_entry = *my_fl; */
700 mono_mb_emit_ldloc (mb, my_fl_var);
701 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
702 mono_mb_emit_stloc (mb, my_entry_var);
704 /* if (EXPECT((word)my_entry >= HBLKSIZE, 1)) { */
705 mono_mb_emit_ldloc (mb, my_entry_var);
706 mono_mb_emit_icon (mb, HBLKSIZE);
707 no_freelist_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
709 /* ptr_t next = obj_link(my_entry); *my_fl = next; */
710 mono_mb_emit_ldloc (mb, my_fl_var);
711 mono_mb_emit_ldloc (mb, my_entry_var);
712 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
713 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
715 /* set the vtable and clear the words in the object */
716 mono_mb_emit_ldloc (mb, my_entry_var);
717 mono_mb_emit_ldarg (mb, 0);
718 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
720 if (atype == ATYPE_FREEPTR) {
721 int start_var, end_var, start_loop;
722 /* end = my_entry + bytes; start = my_entry + sizeof (gpointer);
724 start_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
725 end_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
726 mono_mb_emit_ldloc (mb, my_entry_var);
727 mono_mb_emit_ldloc (mb, bytes_var);
728 mono_mb_emit_byte (mb, MONO_CEE_ADD);
729 mono_mb_emit_stloc (mb, end_var);
730 mono_mb_emit_ldloc (mb, my_entry_var);
731 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
732 mono_mb_emit_byte (mb, MONO_CEE_ADD);
733 mono_mb_emit_stloc (mb, start_var);
737 * } while (start < end);
739 start_loop = mono_mb_get_label (mb);
740 mono_mb_emit_ldloc (mb, start_var);
741 mono_mb_emit_icon (mb, 0);
742 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
743 mono_mb_emit_ldloc (mb, start_var);
744 mono_mb_emit_icon (mb, sizeof (gpointer));
745 mono_mb_emit_byte (mb, MONO_CEE_ADD);
746 mono_mb_emit_stloc (mb, start_var);
748 mono_mb_emit_ldloc (mb, start_var);
749 mono_mb_emit_ldloc (mb, end_var);
750 mono_mb_emit_byte (mb, MONO_CEE_BLT_UN_S);
751 mono_mb_emit_byte (mb, start_loop - (mono_mb_get_label (mb) + 1));
752 } else if (atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING) {
753 /* need to clear just the sync pointer */
754 mono_mb_emit_ldloc (mb, my_entry_var);
755 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
756 mono_mb_emit_byte (mb, MONO_CEE_ADD);
757 mono_mb_emit_icon (mb, 0);
758 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
761 if (atype == ATYPE_STRING) {
762 /* need to set length and clear the last char */
763 /* s->length = len; */
764 mono_mb_emit_ldloc (mb, my_entry_var);
765 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, length));
766 mono_mb_emit_byte (mb, MONO_CEE_ADD);
767 mono_mb_emit_ldarg (mb, 1);
768 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
769 /* s->chars [len] = 0; */
770 mono_mb_emit_ldloc (mb, my_entry_var);
771 mono_mb_emit_ldloc (mb, bytes_var);
772 mono_mb_emit_icon (mb, 2);
773 mono_mb_emit_byte (mb, MONO_CEE_SUB);
774 mono_mb_emit_byte (mb, MONO_CEE_ADD);
775 mono_mb_emit_icon (mb, 0);
776 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
779 /* return my_entry; */
780 mono_mb_emit_ldloc (mb, my_entry_var);
781 mono_mb_emit_byte (mb, MONO_CEE_RET);
783 mono_mb_patch_short_branch (mb, no_freelist_branch);
784 if (not_small_enough_branch > 0)
785 mono_mb_patch_short_branch (mb, not_small_enough_branch);
786 if (size_overflow_branch > 0)
787 mono_mb_patch_short_branch (mb, size_overflow_branch);
788 /* the slow path: we just call back into the runtime */
789 if (atype == ATYPE_STRING) {
790 mono_mb_emit_ldarg (mb, 1);
791 mono_mb_emit_icall (mb, mono_string_alloc);
793 mono_mb_emit_ldarg (mb, 0);
794 mono_mb_emit_icall (mb, mono_object_new_specific);
797 mono_mb_emit_byte (mb, MONO_CEE_RET);
799 res = mono_mb_create_method (mb, csig, 8);
801 mono_method_get_header (res)->init_locals = FALSE;
803 info = mono_image_alloc0 (mono_defaults.corlib, sizeof (AllocatorWrapperInfo));
804 info->alloc_type = atype;
805 mono_marshal_set_wrapper_info (res, info);
810 static MonoMethod* alloc_method_cache [ATYPE_NUM];
813 * If possible, generate a managed method that can quickly allocate objects in class
814 * @klass. The method will typically have an thread-local inline allocation sequence.
815 * The signature of the called method is:
816 * object allocate (MonoVTable *vtable)
817 * Some of the logic here is similar to mono_class_get_allocation_ftn () i object.c,
819 * The thread local alloc logic is taken from libgc/pthread_support.c.
823 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
827 MonoClass *klass = vtable->klass;
828 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
830 /*g_print ("thread tls: %d\n", offset);*/
833 if (!SMALL_ENOUGH (klass->instance_size))
835 if (klass->has_finalize || klass->marshalbyref || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
839 if (klass->byval_arg.type == MONO_TYPE_STRING) {
840 atype = ATYPE_STRING;
841 } else if (!klass->has_references) {
843 atype = ATYPE_FREEPTR_FOR_BOX;
845 atype = ATYPE_FREEPTR;
849 * disabled because we currently do a runtime choice anyway, to
850 * deal with multiple appdomains.
851 if (vtable->gc_descr != GC_NO_DESCRIPTOR)
854 atype = ATYPE_NORMAL;
857 return mono_gc_get_managed_allocator_by_type (atype);
861 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
867 * mono_gc_get_managed_allocator_by_type:
869 * Return a managed allocator method corresponding to allocator type ATYPE.
872 mono_gc_get_managed_allocator_by_type (int atype)
876 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
879 res = alloc_method_cache [atype];
881 res = alloc_method_cache [atype] = create_allocator (atype, offset);
882 mono_loader_unlock ();
887 mono_gc_get_managed_allocator_types (void)
895 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
901 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
907 mono_gc_get_managed_allocator_by_type (int atype)
913 mono_gc_get_managed_allocator_types (void)
920 #endif /* no Boehm GC */