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)
12 #define GC_I_HIDE_POINTERS
13 #include <mono/metadata/gc-internal.h>
14 #include <mono/metadata/mono-gc.h>
15 #include <mono/metadata/gc-internal.h>
16 #include <mono/metadata/profiler-private.h>
17 #include <mono/metadata/class-internals.h>
18 #include <mono/metadata/method-builder.h>
19 #include <mono/metadata/opcodes.h>
20 #include <mono/metadata/domain-internals.h>
21 #include <mono/metadata/metadata-internals.h>
22 #include <mono/metadata/marshal.h>
23 #include <mono/utils/mono-logger-internal.h>
24 #include <mono/utils/mono-time.h>
25 #include <mono/utils/dtrace.h>
26 #include <mono/utils/gc_wrapper.h>
30 #ifdef USE_INCLUDED_LIBGC
33 #define THREAD_LOCAL_ALLOC 1
34 #include "private/pthread_support.h"
37 #define GC_NO_DESCRIPTOR ((gpointer)(0 | GC_DS_LENGTH))
39 static gboolean gc_initialized = FALSE;
42 mono_gc_warning (char *msg, GC_word arg)
44 mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_GC, msg, (unsigned long)arg);
48 mono_gc_base_init (void)
54 * Handle the case when we are called from a thread different from the main thread,
56 * FIXME: Move this to libgc where it belongs.
58 * we used to do this only when running on valgrind,
59 * but it happens also in other setups.
61 #if defined(HAVE_PTHREAD_GETATTR_NP) && defined(HAVE_PTHREAD_ATTR_GETSTACK)
66 pthread_getattr_np (pthread_self (), &attr);
67 pthread_attr_getstack (&attr, &sstart, &size);
68 pthread_attr_destroy (&attr);
69 /*g_print ("stackbottom pth is: %p\n", (char*)sstart + size);*/
72 * The calculation above doesn't seem to work on ia64, also we need to set
73 * GC_register_stackbottom as well, but don't know how.
76 /* apparently with some linuxthreads implementations sstart can be NULL,
77 * fallback to the more imprecise method (bug# 78096).
80 GC_stackbottom = (char*)sstart + size;
83 gsize stack_bottom = (gsize)&dummy;
85 stack_bottom &= ~4095;
86 GC_stackbottom = (char*)stack_bottom;
90 #elif defined(HAVE_PTHREAD_GET_STACKSIZE_NP) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
91 GC_stackbottom = (char*)pthread_get_stackaddr_np (pthread_self ());
92 #elif defined(__OpenBSD__)
93 # include <pthread_np.h>
98 rslt = pthread_stackseg_np(pthread_self(), &ss);
101 GC_stackbottom = (char*)ss.ss_sp;
106 gsize stack_bottom = (gsize)&dummy;
107 stack_bottom += 4095;
108 stack_bottom &= ~4095;
109 /*g_print ("stackbottom is: %p\n", (char*)stack_bottom);*/
110 GC_stackbottom = (char*)stack_bottom;
114 #if !defined(PLATFORM_ANDROID)
115 /* If GC_no_dls is set to true, GC_find_limit is not called. This causes a seg fault on Android. */
119 GC_oom_fn = mono_gc_out_of_memory;
120 GC_set_warn_proc (mono_gc_warning);
121 GC_finalize_on_demand = 1;
122 GC_finalizer_notifier = mono_gc_finalize_notify;
124 #ifdef HAVE_GC_GCJ_MALLOC
125 GC_init_gcj_malloc (5, NULL);
127 mono_gc_enable_events ();
128 gc_initialized = TRUE;
133 * @generation: GC generation identifier
135 * Perform a garbage collection for the given generation, higher numbers
136 * mean usually older objects. Collecting a high-numbered generation
137 * implies collecting also the lower-numbered generations.
138 * The maximum value for @generation can be retrieved with a call to
139 * mono_gc_max_generation(), so this function is usually called as:
141 * mono_gc_collect (mono_gc_max_generation ());
144 mono_gc_collect (int generation)
146 MONO_PROBE_GC_BEGIN (generation);
148 mono_perfcounters->gc_induced++;
151 MONO_PROBE_GC_END (generation);
152 #if defined(ENABLE_DTRACE) && defined(__sun__)
153 /* This works around a dtrace -G problem on Solaris.
154 Limit its actual use to when the probe is enabled. */
155 if (MONO_PROBE_GC_END_ENABLED ())
161 * mono_gc_max_generation:
163 * Get the maximum generation number used by the current garbage
164 * collector. The value will be 0 for the Boehm collector, 1 or more
165 * for the generational collectors.
167 * Returns: the maximum generation number.
170 mono_gc_max_generation (void)
176 * mono_gc_get_generation:
177 * @object: a managed object
179 * Get the garbage collector's generation that @object belongs to.
180 * Use this has a hint only.
182 * Returns: a garbage collector generation number
185 mono_gc_get_generation (MonoObject *object)
191 * mono_gc_collection_count:
192 * @generation: a GC generation number
194 * Get how many times a garbage collection has been performed
195 * for the given @generation number.
197 * Returns: the number of garbage collections
200 mono_gc_collection_count (int generation)
206 * mono_gc_add_memory_pressure:
207 * @value: amount of bytes
209 * Adjust the garbage collector's view of how many bytes of memory
210 * are indirectly referenced by managed objects (for example unmanaged
211 * memory holding image or other binary data).
212 * This is a hint only to the garbage collector algorithm.
213 * Note that negative amounts of @value will decrease the memory
217 mono_gc_add_memory_pressure (gint64 value)
222 * mono_gc_get_used_size:
224 * Get the approximate amount of memory used by managed objects.
226 * Returns: the amount of memory used in bytes
229 mono_gc_get_used_size (void)
231 return GC_get_heap_size () - GC_get_free_bytes ();
235 * mono_gc_get_heap_size:
237 * Get the amount of memory used by the garbage collector.
239 * Returns: the size of the heap in bytes
242 mono_gc_get_heap_size (void)
244 return GC_get_heap_size ();
248 mono_gc_disable (void)
250 #ifdef HAVE_GC_ENABLE
253 g_assert_not_reached ();
258 mono_gc_enable (void)
260 #ifdef HAVE_GC_ENABLE
263 g_assert_not_reached ();
268 mono_gc_is_gc_thread (void)
270 #if GC_VERSION_MAJOR >= 7
272 #elif defined(USE_INCLUDED_LIBGC)
273 return GC_thread_is_registered ();
279 extern int GC_thread_register_foreign (void *base_addr);
282 mono_gc_register_thread (void *baseptr)
284 #if GC_VERSION_MAJOR >= 7
285 struct GC_stack_base sb;
288 res = GC_get_stack_base (&sb);
289 if (res != GC_SUCCESS) {
290 sb.mem_base = baseptr;
292 /* Can't determine the register stack bounds */
293 g_error ("mono_gc_register_thread failed ().\n");
296 res = GC_register_my_thread (&sb);
297 if ((res != GC_SUCCESS) && (res != GC_DUPLICATE)) {
298 g_warning ("GC_register_my_thread () failed.\n");
303 if (mono_gc_is_gc_thread())
305 #if defined(USE_INCLUDED_LIBGC) && !defined(HOST_WIN32)
306 return GC_thread_register_foreign (baseptr);
314 mono_object_is_alive (MonoObject* o)
316 #ifdef USE_INCLUDED_LIBGC
317 return GC_is_marked ((gpointer)o);
323 #ifdef USE_INCLUDED_LIBGC
325 static gint64 gc_start_time;
328 on_gc_notification (GCEventType event)
330 if (event == MONO_GC_EVENT_START) {
331 mono_perfcounters->gc_collections0++;
332 mono_stats.major_gc_count ++;
333 gc_start_time = mono_100ns_ticks ();
334 } else if (event == MONO_GC_EVENT_END) {
335 guint64 heap_size = GC_get_heap_size ();
336 guint64 used_size = heap_size - GC_get_free_bytes ();
337 mono_perfcounters->gc_total_bytes = used_size;
338 mono_perfcounters->gc_committed_bytes = heap_size;
339 mono_perfcounters->gc_reserved_bytes = heap_size;
340 mono_perfcounters->gc_gen0size = heap_size;
341 mono_stats.major_gc_time_usecs += (mono_100ns_ticks () - gc_start_time) / 10;
342 mono_trace_message (MONO_TRACE_GC, "gc took %d usecs", (mono_100ns_ticks () - gc_start_time) / 10);
344 mono_profiler_gc_event ((MonoGCEvent) event, 0);
348 on_gc_heap_resize (size_t new_size)
350 guint64 heap_size = GC_get_heap_size ();
351 mono_perfcounters->gc_committed_bytes = heap_size;
352 mono_perfcounters->gc_reserved_bytes = heap_size;
353 mono_perfcounters->gc_gen0size = heap_size;
354 mono_profiler_gc_heap_resize (new_size);
358 mono_gc_enable_events (void)
360 GC_notify_event = on_gc_notification;
361 GC_on_heap_resize = on_gc_heap_resize;
367 mono_gc_enable_events (void)
374 mono_gc_register_root (char *start, size_t size, void *descr)
376 /* for some strange reason, they want one extra byte on the end */
377 GC_add_roots (start, start + size + 1);
383 mono_gc_deregister_root (char* addr)
386 /* FIXME: libgc doesn't define this work win32 for some reason */
387 /* FIXME: No size info */
388 GC_remove_roots (addr, addr + sizeof (gpointer) + 1);
393 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
395 /* libgc requires that we use HIDE_POINTER... */
396 *link_addr = (void*)HIDE_POINTER (obj);
397 GC_GENERAL_REGISTER_DISAPPEARING_LINK (link_addr, obj);
401 mono_gc_weak_link_remove (void **link_addr)
403 GC_unregister_disappearing_link (link_addr);
408 reveal_link (gpointer link_addr)
410 void **link_a = link_addr;
411 return REVEAL_POINTER (*link_a);
415 mono_gc_weak_link_get (void **link_addr)
417 MonoObject *obj = GC_call_with_alloc_lock (reveal_link, link_addr);
418 if (obj == (MonoObject *) -1)
424 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
426 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
430 mono_gc_make_descr_for_object (gsize *bitmap, int numbits, size_t obj_size)
432 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
436 mono_gc_make_descr_for_array (int vector, gsize *elem_bitmap, int numbits, size_t elem_size)
438 /* libgc has no usable support for arrays... */
439 return GC_NO_DESCRIPTOR;
443 mono_gc_make_descr_from_bitmap (gsize *bitmap, int numbits)
445 #ifdef HAVE_GC_GCJ_MALLOC
446 /* It seems there are issues when the bitmap doesn't fit: play it safe */
448 return GC_NO_DESCRIPTOR;
450 return (gpointer)GC_make_descriptor ((GC_bitmap)bitmap, numbits);
457 mono_gc_make_root_descr_all_refs (int numbits)
463 mono_gc_alloc_fixed (size_t size, void *descr)
465 /* To help track down typed allocation bugs */
469 if (count == atoi (getenv ("COUNT2")))
471 if (count > atoi (getenv ("COUNT2")))
472 return GC_MALLOC (size);
476 return GC_MALLOC_EXPLICITLY_TYPED (size, (GC_descr)descr);
478 return GC_MALLOC (size);
482 mono_gc_free_fixed (void* addr)
487 mono_gc_invoke_finalizers (void)
489 /* There is a bug in GC_invoke_finalizer () in versions <= 6.2alpha4:
490 * the 'mem_freed' variable is not initialized when there are no
491 * objects to finalize, which leads to strange behavior later on.
492 * The check is necessary to work around that bug.
494 if (GC_should_invoke_finalizers ())
495 return GC_invoke_finalizers ();
500 mono_gc_pending_finalizers (void)
502 return GC_should_invoke_finalizers ();
506 * LOCKING: Assumes the domain_finalizers lock is held.
509 add_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
513 if (!domain->track_resurrection_objects_hash)
514 domain->track_resurrection_objects_hash = g_hash_table_new (mono_aligned_addr_hash, NULL);
516 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
517 refs = g_slist_prepend (refs, GUINT_TO_POINTER (gchandle));
518 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
522 mono_gc_add_weak_track_handle (MonoObject *obj, guint32 handle)
529 domain = mono_object_get_domain (obj);
531 mono_domain_finalizers_lock (domain);
533 add_weak_track_handle_internal (domain, obj, handle);
535 g_hash_table_insert (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (handle), obj);
537 mono_domain_finalizers_unlock (domain);
541 * LOCKING: Assumes the domain_finalizers lock is held.
544 remove_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
548 if (!domain->track_resurrection_objects_hash)
551 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
552 refs = g_slist_remove (refs, GUINT_TO_POINTER (gchandle));
553 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
557 mono_gc_change_weak_track_handle (MonoObject *old_obj, MonoObject *obj, guint32 gchandle)
559 MonoDomain *domain = mono_domain_get ();
561 mono_domain_finalizers_lock (domain);
564 remove_weak_track_handle_internal (domain, old_obj, gchandle);
566 add_weak_track_handle_internal (domain, obj, gchandle);
568 mono_domain_finalizers_unlock (domain);
572 mono_gc_remove_weak_track_handle (guint32 gchandle)
574 MonoDomain *domain = mono_domain_get ();
577 /* Clean our entries in the two hashes in MonoDomain */
579 mono_domain_finalizers_lock (domain);
581 /* Get the original object this handle pointed to */
582 obj = g_hash_table_lookup (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
584 g_hash_table_remove (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
586 remove_weak_track_handle_internal (domain, obj, gchandle);
589 mono_domain_finalizers_unlock (domain);
593 mono_gc_remove_weak_track_object (MonoDomain *domain, MonoObject *obj)
597 if (domain->track_resurrection_objects_hash) {
598 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
602 * Since we don't run finalizers again for resurrected objects,
603 * no need to keep these around.
605 g_hash_table_remove (domain->track_resurrection_objects_hash, obj);
612 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
614 *(void**)field_ptr = value;
618 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
620 *(void**)slot_ptr = value;
624 mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
626 memmove (dest_ptr, src_ptr, count * sizeof (gpointer));
630 mono_gc_wbarrier_generic_store (gpointer ptr, MonoObject* value)
632 *(void**)ptr = value;
636 mono_gc_wbarrier_generic_nostore (gpointer ptr)
641 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
643 memmove (dest, src, count * mono_class_value_size (klass, NULL));
647 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
649 /* do not copy the sync state */
650 memcpy ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
651 mono_object_class (obj)->instance_size - sizeof (MonoObject));
655 mono_gc_clear_domain (MonoDomain *domain)
660 mono_gc_get_suspend_signal (void)
662 #ifdef USE_INCLUDED_GC
663 return GC_get_suspend_signal ();
669 #if defined(USE_INCLUDED_LIBGC) && defined(USE_COMPILER_TLS) && defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
670 extern __thread MONO_TLS_FAST void* GC_thread_tls;
671 #include "metadata-internals.h"
677 while (!(v & (1 << i)))
684 ATYPE_FREEPTR_FOR_BOX,
692 create_allocator (int atype, int offset)
694 int index_var, bytes_var, my_fl_var, my_entry_var;
695 guint32 no_freelist_branch, not_small_enough_branch = 0;
696 guint32 size_overflow_branch = 0;
697 MonoMethodBuilder *mb;
699 MonoMethodSignature *csig;
700 AllocatorWrapperInfo *info;
702 if (atype == ATYPE_STRING) {
703 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
704 csig->ret = &mono_defaults.string_class->byval_arg;
705 csig->params [0] = &mono_defaults.int_class->byval_arg;
706 csig->params [1] = &mono_defaults.int32_class->byval_arg;
708 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
709 csig->ret = &mono_defaults.object_class->byval_arg;
710 csig->params [0] = &mono_defaults.int_class->byval_arg;
713 mb = mono_mb_new (mono_defaults.object_class, "Alloc", MONO_WRAPPER_ALLOC);
714 bytes_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
715 if (atype == ATYPE_STRING) {
716 /* a string alloator method takes the args: (vtable, len) */
717 /* bytes = (sizeof (MonoString) + ((len + 1) * 2)); */
718 mono_mb_emit_ldarg (mb, 1);
719 mono_mb_emit_icon (mb, 1);
720 mono_mb_emit_byte (mb, MONO_CEE_ADD);
721 mono_mb_emit_icon (mb, 1);
722 mono_mb_emit_byte (mb, MONO_CEE_SHL);
723 // sizeof (MonoString) might include padding
724 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, chars));
725 mono_mb_emit_byte (mb, MONO_CEE_ADD);
726 mono_mb_emit_stloc (mb, bytes_var);
728 /* bytes = vtable->klass->instance_size */
729 mono_mb_emit_ldarg (mb, 0);
730 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoVTable, klass));
731 mono_mb_emit_byte (mb, MONO_CEE_ADD);
732 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
733 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoClass, instance_size));
734 mono_mb_emit_byte (mb, MONO_CEE_ADD);
735 /* FIXME: assert instance_size stays a 4 byte integer */
736 mono_mb_emit_byte (mb, MONO_CEE_LDIND_U4);
737 mono_mb_emit_stloc (mb, bytes_var);
740 /* this is needed for strings/arrays only as the other big types are never allocated with this method */
741 if (atype == ATYPE_STRING) {
743 /* if (!SMALL_ENOUGH (bytes)) jump slow_path;*/
744 mono_mb_emit_ldloc (mb, bytes_var);
745 mono_mb_emit_icon (mb, (NFREELISTS-1) * GRANULARITY);
746 not_small_enough_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
747 /* check for overflow */
748 mono_mb_emit_ldloc (mb, bytes_var);
749 mono_mb_emit_icon (mb, sizeof (MonoString));
750 size_overflow_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
753 /* int index = INDEX_FROM_BYTES(bytes); */
754 index_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
756 mono_mb_emit_ldloc (mb, bytes_var);
757 mono_mb_emit_icon (mb, GRANULARITY - 1);
758 mono_mb_emit_byte (mb, MONO_CEE_ADD);
759 mono_mb_emit_icon (mb, shift_amount (GRANULARITY));
760 mono_mb_emit_byte (mb, MONO_CEE_SHR_UN);
761 mono_mb_emit_icon (mb, shift_amount (sizeof (gpointer)));
762 mono_mb_emit_byte (mb, MONO_CEE_SHL);
763 /* index var is already adjusted into bytes */
764 mono_mb_emit_stloc (mb, index_var);
766 my_fl_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
767 my_entry_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
768 /* my_fl = ((GC_thread)tsd) -> ptrfree_freelists + index; */
769 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
770 mono_mb_emit_byte (mb, 0x0D); /* CEE_MONO_TLS */
771 mono_mb_emit_i4 (mb, offset);
772 if (atype == ATYPE_FREEPTR || atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING)
773 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, ptrfree_freelists));
774 else if (atype == ATYPE_NORMAL)
775 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, normal_freelists));
776 else if (atype == ATYPE_GCJ)
777 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, gcj_freelists));
779 g_assert_not_reached ();
780 mono_mb_emit_byte (mb, MONO_CEE_ADD);
781 mono_mb_emit_ldloc (mb, index_var);
782 mono_mb_emit_byte (mb, MONO_CEE_ADD);
783 mono_mb_emit_stloc (mb, my_fl_var);
785 /* my_entry = *my_fl; */
786 mono_mb_emit_ldloc (mb, my_fl_var);
787 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
788 mono_mb_emit_stloc (mb, my_entry_var);
790 /* if (EXPECT((word)my_entry >= HBLKSIZE, 1)) { */
791 mono_mb_emit_ldloc (mb, my_entry_var);
792 mono_mb_emit_icon (mb, HBLKSIZE);
793 no_freelist_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
795 /* ptr_t next = obj_link(my_entry); *my_fl = next; */
796 mono_mb_emit_ldloc (mb, my_fl_var);
797 mono_mb_emit_ldloc (mb, my_entry_var);
798 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
799 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
801 /* set the vtable and clear the words in the object */
802 mono_mb_emit_ldloc (mb, my_entry_var);
803 mono_mb_emit_ldarg (mb, 0);
804 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
806 if (atype == ATYPE_FREEPTR) {
807 int start_var, end_var, start_loop;
808 /* end = my_entry + bytes; start = my_entry + sizeof (gpointer);
810 start_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
811 end_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
812 mono_mb_emit_ldloc (mb, my_entry_var);
813 mono_mb_emit_ldloc (mb, bytes_var);
814 mono_mb_emit_byte (mb, MONO_CEE_ADD);
815 mono_mb_emit_stloc (mb, end_var);
816 mono_mb_emit_ldloc (mb, my_entry_var);
817 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
818 mono_mb_emit_byte (mb, MONO_CEE_ADD);
819 mono_mb_emit_stloc (mb, start_var);
823 * } while (start < end);
825 start_loop = mono_mb_get_label (mb);
826 mono_mb_emit_ldloc (mb, start_var);
827 mono_mb_emit_icon (mb, 0);
828 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
829 mono_mb_emit_ldloc (mb, start_var);
830 mono_mb_emit_icon (mb, sizeof (gpointer));
831 mono_mb_emit_byte (mb, MONO_CEE_ADD);
832 mono_mb_emit_stloc (mb, start_var);
834 mono_mb_emit_ldloc (mb, start_var);
835 mono_mb_emit_ldloc (mb, end_var);
836 mono_mb_emit_byte (mb, MONO_CEE_BLT_UN_S);
837 mono_mb_emit_byte (mb, start_loop - (mono_mb_get_label (mb) + 1));
838 } else if (atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING) {
839 /* need to clear just the sync pointer */
840 mono_mb_emit_ldloc (mb, my_entry_var);
841 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
842 mono_mb_emit_byte (mb, MONO_CEE_ADD);
843 mono_mb_emit_icon (mb, 0);
844 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
847 if (atype == ATYPE_STRING) {
848 /* need to set length and clear the last char */
849 /* s->length = len; */
850 mono_mb_emit_ldloc (mb, my_entry_var);
851 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, length));
852 mono_mb_emit_byte (mb, MONO_CEE_ADD);
853 mono_mb_emit_ldarg (mb, 1);
854 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
855 /* s->chars [len] = 0; */
856 mono_mb_emit_ldloc (mb, my_entry_var);
857 mono_mb_emit_ldloc (mb, bytes_var);
858 mono_mb_emit_icon (mb, 2);
859 mono_mb_emit_byte (mb, MONO_CEE_SUB);
860 mono_mb_emit_byte (mb, MONO_CEE_ADD);
861 mono_mb_emit_icon (mb, 0);
862 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
865 /* return my_entry; */
866 mono_mb_emit_ldloc (mb, my_entry_var);
867 mono_mb_emit_byte (mb, MONO_CEE_RET);
869 mono_mb_patch_short_branch (mb, no_freelist_branch);
870 if (not_small_enough_branch > 0)
871 mono_mb_patch_short_branch (mb, not_small_enough_branch);
872 if (size_overflow_branch > 0)
873 mono_mb_patch_short_branch (mb, size_overflow_branch);
874 /* the slow path: we just call back into the runtime */
875 if (atype == ATYPE_STRING) {
876 mono_mb_emit_ldarg (mb, 1);
877 mono_mb_emit_icall (mb, mono_string_alloc);
879 mono_mb_emit_ldarg (mb, 0);
880 mono_mb_emit_icall (mb, mono_object_new_specific);
883 mono_mb_emit_byte (mb, MONO_CEE_RET);
885 res = mono_mb_create_method (mb, csig, 8);
887 mono_method_get_header (res)->init_locals = FALSE;
889 info = mono_image_alloc0 (mono_defaults.corlib, sizeof (AllocatorWrapperInfo));
890 info->gc_name = "boehm";
891 info->alloc_type = atype;
892 mono_marshal_set_wrapper_info (res, info);
897 static MonoMethod* alloc_method_cache [ATYPE_NUM];
900 * If possible, generate a managed method that can quickly allocate objects in class
901 * @klass. The method will typically have an thread-local inline allocation sequence.
902 * The signature of the called method is:
903 * object allocate (MonoVTable *vtable)
904 * Some of the logic here is similar to mono_class_get_allocation_ftn () i object.c,
906 * The thread local alloc logic is taken from libgc/pthread_support.c.
910 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
914 MonoClass *klass = vtable->klass;
915 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
917 /*g_print ("thread tls: %d\n", offset);*/
920 if (!SMALL_ENOUGH (klass->instance_size))
922 if (klass->has_finalize || klass->marshalbyref || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
926 if (klass->byval_arg.type == MONO_TYPE_STRING) {
927 atype = ATYPE_STRING;
928 } else if (!klass->has_references) {
930 atype = ATYPE_FREEPTR_FOR_BOX;
932 atype = ATYPE_FREEPTR;
936 * disabled because we currently do a runtime choice anyway, to
937 * deal with multiple appdomains.
938 if (vtable->gc_descr != GC_NO_DESCRIPTOR)
941 atype = ATYPE_NORMAL;
944 return mono_gc_get_managed_allocator_by_type (atype);
948 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
954 * mono_gc_get_managed_allocator_by_type:
956 * Return a managed allocator method corresponding to allocator type ATYPE.
959 mono_gc_get_managed_allocator_by_type (int atype)
963 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
966 res = alloc_method_cache [atype];
968 res = alloc_method_cache [atype] = create_allocator (atype, offset);
969 mono_loader_unlock ();
974 mono_gc_get_managed_allocator_types (void)
980 mono_gc_get_write_barrier (void)
982 g_assert_not_reached ();
989 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
995 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
1001 mono_gc_get_managed_allocator_by_type (int atype)
1007 mono_gc_get_managed_allocator_types (void)
1013 mono_gc_get_write_barrier (void)
1015 g_assert_not_reached ();
1022 mono_gc_get_gc_name (void)
1028 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
1030 return GC_call_with_alloc_lock (func, data);
1034 mono_gc_get_description (void)
1036 return g_strdup (DEFAULT_GC_NAME);
1040 mono_gc_set_desktop_mode (void)
1046 mono_gc_is_moving (void)
1052 mono_gc_is_disabled (void)
1054 if (GC_dont_gc || g_getenv ("GC_DONT_GC"))
1061 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
1063 g_assert_not_reached ();
1067 * These will call the redefined versions in libgc.
1073 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
1075 return pthread_create (new_thread, attr, start_routine, arg);
1079 mono_gc_pthread_join (pthread_t thread, void **retval)
1081 return pthread_join (thread, retval);
1085 mono_gc_pthread_detach (pthread_t thread)
1087 return pthread_detach (thread);
1092 #endif /* no Boehm GC */