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);
324 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
329 #ifdef USE_INCLUDED_LIBGC
331 static gint64 gc_start_time;
334 on_gc_notification (GCEventType event)
336 if (event == MONO_GC_EVENT_START) {
337 mono_perfcounters->gc_collections0++;
338 mono_stats.major_gc_count ++;
339 gc_start_time = mono_100ns_ticks ();
340 } else if (event == MONO_GC_EVENT_END) {
341 guint64 heap_size = GC_get_heap_size ();
342 guint64 used_size = heap_size - GC_get_free_bytes ();
343 mono_perfcounters->gc_total_bytes = used_size;
344 mono_perfcounters->gc_committed_bytes = heap_size;
345 mono_perfcounters->gc_reserved_bytes = heap_size;
346 mono_perfcounters->gc_gen0size = heap_size;
347 mono_stats.major_gc_time_usecs += (mono_100ns_ticks () - gc_start_time) / 10;
348 mono_trace_message (MONO_TRACE_GC, "gc took %d usecs", (mono_100ns_ticks () - gc_start_time) / 10);
350 mono_profiler_gc_event ((MonoGCEvent) event, 0);
354 on_gc_heap_resize (size_t new_size)
356 guint64 heap_size = GC_get_heap_size ();
357 mono_perfcounters->gc_committed_bytes = heap_size;
358 mono_perfcounters->gc_reserved_bytes = heap_size;
359 mono_perfcounters->gc_gen0size = heap_size;
360 mono_profiler_gc_heap_resize (new_size);
364 mono_gc_enable_events (void)
366 GC_notify_event = on_gc_notification;
367 GC_on_heap_resize = on_gc_heap_resize;
373 mono_gc_enable_events (void)
380 mono_gc_register_root (char *start, size_t size, void *descr)
382 /* for some strange reason, they want one extra byte on the end */
383 GC_add_roots (start, start + size + 1);
389 mono_gc_deregister_root (char* addr)
392 /* FIXME: libgc doesn't define this work win32 for some reason */
393 /* FIXME: No size info */
394 GC_remove_roots (addr, addr + sizeof (gpointer) + 1);
399 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
401 /* libgc requires that we use HIDE_POINTER... */
402 *link_addr = (void*)HIDE_POINTER (obj);
403 GC_GENERAL_REGISTER_DISAPPEARING_LINK (link_addr, obj);
407 mono_gc_weak_link_remove (void **link_addr)
409 GC_unregister_disappearing_link (link_addr);
414 reveal_link (gpointer link_addr)
416 void **link_a = link_addr;
417 return REVEAL_POINTER (*link_a);
421 mono_gc_weak_link_get (void **link_addr)
423 MonoObject *obj = GC_call_with_alloc_lock (reveal_link, link_addr);
424 if (obj == (MonoObject *) -1)
430 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
432 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
436 mono_gc_make_descr_for_object (gsize *bitmap, int numbits, size_t obj_size)
438 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
442 mono_gc_make_descr_for_array (int vector, gsize *elem_bitmap, int numbits, size_t elem_size)
444 /* libgc has no usable support for arrays... */
445 return GC_NO_DESCRIPTOR;
449 mono_gc_make_descr_from_bitmap (gsize *bitmap, int numbits)
451 #ifdef HAVE_GC_GCJ_MALLOC
452 /* It seems there are issues when the bitmap doesn't fit: play it safe */
454 return GC_NO_DESCRIPTOR;
456 return (gpointer)GC_make_descriptor ((GC_bitmap)bitmap, numbits);
463 mono_gc_make_root_descr_all_refs (int numbits)
469 mono_gc_alloc_fixed (size_t size, void *descr)
471 /* To help track down typed allocation bugs */
475 if (count == atoi (getenv ("COUNT2")))
477 if (count > atoi (getenv ("COUNT2")))
478 return GC_MALLOC (size);
482 return GC_MALLOC_EXPLICITLY_TYPED (size, (GC_descr)descr);
484 return GC_MALLOC (size);
488 mono_gc_free_fixed (void* addr)
493 mono_gc_invoke_finalizers (void)
495 /* There is a bug in GC_invoke_finalizer () in versions <= 6.2alpha4:
496 * the 'mem_freed' variable is not initialized when there are no
497 * objects to finalize, which leads to strange behavior later on.
498 * The check is necessary to work around that bug.
500 if (GC_should_invoke_finalizers ())
501 return GC_invoke_finalizers ();
506 mono_gc_pending_finalizers (void)
508 return GC_should_invoke_finalizers ();
512 * LOCKING: Assumes the domain_finalizers lock is held.
515 add_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
519 if (!domain->track_resurrection_objects_hash)
520 domain->track_resurrection_objects_hash = g_hash_table_new (mono_aligned_addr_hash, NULL);
522 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
523 refs = g_slist_prepend (refs, GUINT_TO_POINTER (gchandle));
524 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
528 mono_gc_add_weak_track_handle (MonoObject *obj, guint32 handle)
535 domain = mono_object_get_domain (obj);
537 mono_domain_finalizers_lock (domain);
539 add_weak_track_handle_internal (domain, obj, handle);
541 g_hash_table_insert (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (handle), obj);
543 mono_domain_finalizers_unlock (domain);
547 * LOCKING: Assumes the domain_finalizers lock is held.
550 remove_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
554 if (!domain->track_resurrection_objects_hash)
557 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
558 refs = g_slist_remove (refs, GUINT_TO_POINTER (gchandle));
559 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
563 mono_gc_change_weak_track_handle (MonoObject *old_obj, MonoObject *obj, guint32 gchandle)
565 MonoDomain *domain = mono_domain_get ();
567 mono_domain_finalizers_lock (domain);
570 remove_weak_track_handle_internal (domain, old_obj, gchandle);
572 add_weak_track_handle_internal (domain, obj, gchandle);
574 mono_domain_finalizers_unlock (domain);
578 mono_gc_remove_weak_track_handle (guint32 gchandle)
580 MonoDomain *domain = mono_domain_get ();
583 /* Clean our entries in the two hashes in MonoDomain */
585 mono_domain_finalizers_lock (domain);
587 /* Get the original object this handle pointed to */
588 obj = g_hash_table_lookup (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
590 g_hash_table_remove (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
592 remove_weak_track_handle_internal (domain, obj, gchandle);
595 mono_domain_finalizers_unlock (domain);
599 mono_gc_remove_weak_track_object (MonoDomain *domain, MonoObject *obj)
603 if (domain->track_resurrection_objects_hash) {
604 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
608 * Since we don't run finalizers again for resurrected objects,
609 * no need to keep these around.
611 g_hash_table_remove (domain->track_resurrection_objects_hash, obj);
618 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
620 *(void**)field_ptr = value;
624 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
626 *(void**)slot_ptr = value;
630 mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
632 memmove (dest_ptr, src_ptr, count * sizeof (gpointer));
636 mono_gc_wbarrier_generic_store (gpointer ptr, MonoObject* value)
638 *(void**)ptr = value;
642 mono_gc_wbarrier_generic_nostore (gpointer ptr)
647 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
649 memmove (dest, src, count * mono_class_value_size (klass, NULL));
653 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
655 /* do not copy the sync state */
656 memcpy ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
657 mono_object_class (obj)->instance_size - sizeof (MonoObject));
661 mono_gc_clear_domain (MonoDomain *domain)
666 mono_gc_get_suspend_signal (void)
668 #ifdef USE_INCLUDED_GC
669 return GC_get_suspend_signal ();
675 #if defined(USE_INCLUDED_LIBGC) && defined(USE_COMPILER_TLS) && defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
676 extern __thread MONO_TLS_FAST void* GC_thread_tls;
677 #include "metadata-internals.h"
683 while (!(v & (1 << i)))
690 ATYPE_FREEPTR_FOR_BOX,
698 create_allocator (int atype, int offset)
700 int index_var, bytes_var, my_fl_var, my_entry_var;
701 guint32 no_freelist_branch, not_small_enough_branch = 0;
702 guint32 size_overflow_branch = 0;
703 MonoMethodBuilder *mb;
705 MonoMethodSignature *csig;
706 AllocatorWrapperInfo *info;
708 if (atype == ATYPE_STRING) {
709 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
710 csig->ret = &mono_defaults.string_class->byval_arg;
711 csig->params [0] = &mono_defaults.int_class->byval_arg;
712 csig->params [1] = &mono_defaults.int32_class->byval_arg;
714 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
715 csig->ret = &mono_defaults.object_class->byval_arg;
716 csig->params [0] = &mono_defaults.int_class->byval_arg;
719 mb = mono_mb_new (mono_defaults.object_class, "Alloc", MONO_WRAPPER_ALLOC);
720 bytes_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
721 if (atype == ATYPE_STRING) {
722 /* a string alloator method takes the args: (vtable, len) */
723 /* bytes = (sizeof (MonoString) + ((len + 1) * 2)); */
724 mono_mb_emit_ldarg (mb, 1);
725 mono_mb_emit_icon (mb, 1);
726 mono_mb_emit_byte (mb, MONO_CEE_ADD);
727 mono_mb_emit_icon (mb, 1);
728 mono_mb_emit_byte (mb, MONO_CEE_SHL);
729 // sizeof (MonoString) might include padding
730 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, chars));
731 mono_mb_emit_byte (mb, MONO_CEE_ADD);
732 mono_mb_emit_stloc (mb, bytes_var);
734 /* bytes = vtable->klass->instance_size */
735 mono_mb_emit_ldarg (mb, 0);
736 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoVTable, klass));
737 mono_mb_emit_byte (mb, MONO_CEE_ADD);
738 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
739 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoClass, instance_size));
740 mono_mb_emit_byte (mb, MONO_CEE_ADD);
741 /* FIXME: assert instance_size stays a 4 byte integer */
742 mono_mb_emit_byte (mb, MONO_CEE_LDIND_U4);
743 mono_mb_emit_stloc (mb, bytes_var);
746 /* this is needed for strings/arrays only as the other big types are never allocated with this method */
747 if (atype == ATYPE_STRING) {
749 /* if (!SMALL_ENOUGH (bytes)) jump slow_path;*/
750 mono_mb_emit_ldloc (mb, bytes_var);
751 mono_mb_emit_icon (mb, (NFREELISTS-1) * GRANULARITY);
752 not_small_enough_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
753 /* check for overflow */
754 mono_mb_emit_ldloc (mb, bytes_var);
755 mono_mb_emit_icon (mb, sizeof (MonoString));
756 size_overflow_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
759 /* int index = INDEX_FROM_BYTES(bytes); */
760 index_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
762 mono_mb_emit_ldloc (mb, bytes_var);
763 mono_mb_emit_icon (mb, GRANULARITY - 1);
764 mono_mb_emit_byte (mb, MONO_CEE_ADD);
765 mono_mb_emit_icon (mb, shift_amount (GRANULARITY));
766 mono_mb_emit_byte (mb, MONO_CEE_SHR_UN);
767 mono_mb_emit_icon (mb, shift_amount (sizeof (gpointer)));
768 mono_mb_emit_byte (mb, MONO_CEE_SHL);
769 /* index var is already adjusted into bytes */
770 mono_mb_emit_stloc (mb, index_var);
772 my_fl_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
773 my_entry_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
774 /* my_fl = ((GC_thread)tsd) -> ptrfree_freelists + index; */
775 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
776 mono_mb_emit_byte (mb, 0x0D); /* CEE_MONO_TLS */
777 mono_mb_emit_i4 (mb, offset);
778 if (atype == ATYPE_FREEPTR || atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING)
779 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, ptrfree_freelists));
780 else if (atype == ATYPE_NORMAL)
781 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, normal_freelists));
782 else if (atype == ATYPE_GCJ)
783 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, gcj_freelists));
785 g_assert_not_reached ();
786 mono_mb_emit_byte (mb, MONO_CEE_ADD);
787 mono_mb_emit_ldloc (mb, index_var);
788 mono_mb_emit_byte (mb, MONO_CEE_ADD);
789 mono_mb_emit_stloc (mb, my_fl_var);
791 /* my_entry = *my_fl; */
792 mono_mb_emit_ldloc (mb, my_fl_var);
793 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
794 mono_mb_emit_stloc (mb, my_entry_var);
796 /* if (EXPECT((word)my_entry >= HBLKSIZE, 1)) { */
797 mono_mb_emit_ldloc (mb, my_entry_var);
798 mono_mb_emit_icon (mb, HBLKSIZE);
799 no_freelist_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
801 /* ptr_t next = obj_link(my_entry); *my_fl = next; */
802 mono_mb_emit_ldloc (mb, my_fl_var);
803 mono_mb_emit_ldloc (mb, my_entry_var);
804 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
805 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
807 /* set the vtable and clear the words in the object */
808 mono_mb_emit_ldloc (mb, my_entry_var);
809 mono_mb_emit_ldarg (mb, 0);
810 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
812 if (atype == ATYPE_FREEPTR) {
813 int start_var, end_var, start_loop;
814 /* end = my_entry + bytes; start = my_entry + sizeof (gpointer);
816 start_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
817 end_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
818 mono_mb_emit_ldloc (mb, my_entry_var);
819 mono_mb_emit_ldloc (mb, bytes_var);
820 mono_mb_emit_byte (mb, MONO_CEE_ADD);
821 mono_mb_emit_stloc (mb, end_var);
822 mono_mb_emit_ldloc (mb, my_entry_var);
823 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
824 mono_mb_emit_byte (mb, MONO_CEE_ADD);
825 mono_mb_emit_stloc (mb, start_var);
829 * } while (start < end);
831 start_loop = mono_mb_get_label (mb);
832 mono_mb_emit_ldloc (mb, start_var);
833 mono_mb_emit_icon (mb, 0);
834 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
835 mono_mb_emit_ldloc (mb, start_var);
836 mono_mb_emit_icon (mb, sizeof (gpointer));
837 mono_mb_emit_byte (mb, MONO_CEE_ADD);
838 mono_mb_emit_stloc (mb, start_var);
840 mono_mb_emit_ldloc (mb, start_var);
841 mono_mb_emit_ldloc (mb, end_var);
842 mono_mb_emit_byte (mb, MONO_CEE_BLT_UN_S);
843 mono_mb_emit_byte (mb, start_loop - (mono_mb_get_label (mb) + 1));
844 } else if (atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING) {
845 /* need to clear just the sync pointer */
846 mono_mb_emit_ldloc (mb, my_entry_var);
847 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
848 mono_mb_emit_byte (mb, MONO_CEE_ADD);
849 mono_mb_emit_icon (mb, 0);
850 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
853 if (atype == ATYPE_STRING) {
854 /* need to set length and clear the last char */
855 /* s->length = len; */
856 mono_mb_emit_ldloc (mb, my_entry_var);
857 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, length));
858 mono_mb_emit_byte (mb, MONO_CEE_ADD);
859 mono_mb_emit_ldarg (mb, 1);
860 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
861 /* s->chars [len] = 0; */
862 mono_mb_emit_ldloc (mb, my_entry_var);
863 mono_mb_emit_ldloc (mb, bytes_var);
864 mono_mb_emit_icon (mb, 2);
865 mono_mb_emit_byte (mb, MONO_CEE_SUB);
866 mono_mb_emit_byte (mb, MONO_CEE_ADD);
867 mono_mb_emit_icon (mb, 0);
868 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
871 /* return my_entry; */
872 mono_mb_emit_ldloc (mb, my_entry_var);
873 mono_mb_emit_byte (mb, MONO_CEE_RET);
875 mono_mb_patch_short_branch (mb, no_freelist_branch);
876 if (not_small_enough_branch > 0)
877 mono_mb_patch_short_branch (mb, not_small_enough_branch);
878 if (size_overflow_branch > 0)
879 mono_mb_patch_short_branch (mb, size_overflow_branch);
880 /* the slow path: we just call back into the runtime */
881 if (atype == ATYPE_STRING) {
882 mono_mb_emit_ldarg (mb, 1);
883 mono_mb_emit_icall (mb, mono_string_alloc);
885 mono_mb_emit_ldarg (mb, 0);
886 mono_mb_emit_icall (mb, mono_object_new_specific);
889 mono_mb_emit_byte (mb, MONO_CEE_RET);
891 res = mono_mb_create_method (mb, csig, 8);
893 mono_method_get_header (res)->init_locals = FALSE;
895 info = mono_image_alloc0 (mono_defaults.corlib, sizeof (AllocatorWrapperInfo));
896 info->gc_name = "boehm";
897 info->alloc_type = atype;
898 mono_marshal_set_wrapper_info (res, info);
903 static MonoMethod* alloc_method_cache [ATYPE_NUM];
906 * If possible, generate a managed method that can quickly allocate objects in class
907 * @klass. The method will typically have an thread-local inline allocation sequence.
908 * The signature of the called method is:
909 * object allocate (MonoVTable *vtable)
910 * Some of the logic here is similar to mono_class_get_allocation_ftn () i object.c,
912 * The thread local alloc logic is taken from libgc/pthread_support.c.
916 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
920 MonoClass *klass = vtable->klass;
921 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
923 /*g_print ("thread tls: %d\n", offset);*/
926 if (!SMALL_ENOUGH (klass->instance_size))
928 if (klass->has_finalize || klass->marshalbyref || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
932 if (klass->byval_arg.type == MONO_TYPE_STRING) {
933 atype = ATYPE_STRING;
934 } else if (!klass->has_references) {
936 atype = ATYPE_FREEPTR_FOR_BOX;
938 atype = ATYPE_FREEPTR;
942 * disabled because we currently do a runtime choice anyway, to
943 * deal with multiple appdomains.
944 if (vtable->gc_descr != GC_NO_DESCRIPTOR)
947 atype = ATYPE_NORMAL;
950 return mono_gc_get_managed_allocator_by_type (atype);
954 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
960 * mono_gc_get_managed_allocator_by_type:
962 * Return a managed allocator method corresponding to allocator type ATYPE.
965 mono_gc_get_managed_allocator_by_type (int atype)
969 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
972 res = alloc_method_cache [atype];
974 res = alloc_method_cache [atype] = create_allocator (atype, offset);
975 mono_loader_unlock ();
980 mono_gc_get_managed_allocator_types (void)
986 mono_gc_get_write_barrier (void)
988 g_assert_not_reached ();
995 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
1001 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
1007 mono_gc_get_managed_allocator_by_type (int atype)
1013 mono_gc_get_managed_allocator_types (void)
1019 mono_gc_get_write_barrier (void)
1021 g_assert_not_reached ();
1028 mono_gc_get_gc_name (void)
1034 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
1036 return GC_call_with_alloc_lock (func, data);
1040 mono_gc_get_description (void)
1042 return g_strdup (DEFAULT_GC_NAME);
1046 mono_gc_set_desktop_mode (void)
1052 mono_gc_is_moving (void)
1058 mono_gc_is_disabled (void)
1060 if (GC_dont_gc || g_getenv ("GC_DONT_GC"))
1067 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
1069 g_assert_not_reached ();
1073 * These will call the redefined versions in libgc.
1079 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
1081 return pthread_create (new_thread, attr, start_routine, arg);
1085 mono_gc_pthread_join (pthread_t thread, void **retval)
1087 return pthread_join (thread, retval);
1091 mono_gc_pthread_detach (pthread_t thread)
1093 return pthread_detach (thread);
1098 #endif /* no Boehm GC */