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/mono-threads.h>
26 #include <mono/utils/dtrace.h>
27 #include <mono/utils/gc_wrapper.h>
31 #ifdef USE_INCLUDED_LIBGC
34 #define THREAD_LOCAL_ALLOC 1
35 #include "private/pthread_support.h"
38 #define GC_NO_DESCRIPTOR ((gpointer)(0 | GC_DS_LENGTH))
39 /*Boehm max heap cannot be smaller than 16MB*/
40 #define MIN_BOEHM_MAX_HEAP_SIZE_IN_MB 16
41 #define MIN_BOEHM_MAX_HEAP_SIZE (MIN_BOEHM_MAX_HEAP_SIZE_IN_MB << 20)
43 static gboolean gc_initialized = FALSE;
46 boehm_thread_register (MonoThreadInfo* info, void *baseptr);
49 mono_gc_warning (char *msg, GC_word arg)
51 mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_GC, msg, (unsigned long)arg);
55 mono_gc_base_init (void)
57 MonoThreadInfoCallbacks cb;
64 * Handle the case when we are called from a thread different from the main thread,
66 * FIXME: Move this to libgc where it belongs.
68 * we used to do this only when running on valgrind,
69 * but it happens also in other setups.
71 #if defined(HAVE_PTHREAD_GETATTR_NP) && defined(HAVE_PTHREAD_ATTR_GETSTACK)
76 pthread_getattr_np (pthread_self (), &attr);
77 pthread_attr_getstack (&attr, &sstart, &size);
78 pthread_attr_destroy (&attr);
79 /*g_print ("stackbottom pth is: %p\n", (char*)sstart + size);*/
82 * The calculation above doesn't seem to work on ia64, also we need to set
83 * GC_register_stackbottom as well, but don't know how.
86 /* apparently with some linuxthreads implementations sstart can be NULL,
87 * fallback to the more imprecise method (bug# 78096).
90 GC_stackbottom = (char*)sstart + size;
93 gsize stack_bottom = (gsize)&dummy;
95 stack_bottom &= ~4095;
96 GC_stackbottom = (char*)stack_bottom;
100 #elif defined(HAVE_PTHREAD_GET_STACKSIZE_NP) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
101 GC_stackbottom = (char*)pthread_get_stackaddr_np (pthread_self ());
102 #elif defined(__OpenBSD__)
103 # include <pthread_np.h>
108 rslt = pthread_stackseg_np(pthread_self(), &ss);
109 g_assert (rslt == 0);
111 GC_stackbottom = (char*)ss.ss_sp;
113 #elif defined(__native_client__)
114 /* Do nothing, GC_stackbottom is set correctly in libgc */
118 gsize stack_bottom = (gsize)&dummy;
119 stack_bottom += 4095;
120 stack_bottom &= ~4095;
121 /*g_print ("stackbottom is: %p\n", (char*)stack_bottom);*/
122 GC_stackbottom = (char*)stack_bottom;
126 #if !defined(PLATFORM_ANDROID)
127 /* If GC_no_dls is set to true, GC_find_limit is not called. This causes a seg fault on Android. */
131 GC_oom_fn = mono_gc_out_of_memory;
132 GC_set_warn_proc (mono_gc_warning);
133 GC_finalize_on_demand = 1;
134 GC_finalizer_notifier = mono_gc_finalize_notify;
136 #ifdef HAVE_GC_GCJ_MALLOC
137 GC_init_gcj_malloc (5, NULL);
140 #ifdef HAVE_GC_ALLOW_REGISTER_THREADS
141 GC_allow_register_threads();
144 if ((env = getenv ("MONO_GC_PARAMS"))) {
145 char **ptr, **opts = g_strsplit (env, ",", -1);
146 for (ptr = opts; *ptr; ++ptr) {
148 if (g_str_has_prefix (opt, "max-heap-size=")) {
151 opt = strchr (opt, '=') + 1;
152 if (*opt && mono_gc_parse_environment_string_extract_number (opt, &max_heap)) {
153 if (max_heap < MIN_BOEHM_MAX_HEAP_SIZE) {
154 fprintf (stderr, "max-heap-size must be at least %dMb.\n", MIN_BOEHM_MAX_HEAP_SIZE_IN_MB);
157 GC_set_max_heap_size (max_heap);
159 fprintf (stderr, "max-heap-size must be an integer.\n");
164 fprintf (stderr, "MONO_GC_PARAMS must be a comma-delimited list of one or more of the following:\n");
165 fprintf (stderr, " max-heap-size=N (where N is an integer, possibly with a k, m or a g suffix)\n");
172 memset (&cb, 0, sizeof (cb));
173 cb.thread_register = boehm_thread_register;
174 mono_threads_init (&cb, sizeof (MonoThreadInfo));
176 mono_gc_enable_events ();
177 gc_initialized = TRUE;
182 * @generation: GC generation identifier
184 * Perform a garbage collection for the given generation, higher numbers
185 * mean usually older objects. Collecting a high-numbered generation
186 * implies collecting also the lower-numbered generations.
187 * The maximum value for @generation can be retrieved with a call to
188 * mono_gc_max_generation(), so this function is usually called as:
190 * mono_gc_collect (mono_gc_max_generation ());
193 mono_gc_collect (int generation)
195 MONO_PROBE_GC_BEGIN (generation);
197 mono_perfcounters->gc_induced++;
200 MONO_PROBE_GC_END (generation);
201 #if defined(ENABLE_DTRACE) && defined(__sun__)
202 /* This works around a dtrace -G problem on Solaris.
203 Limit its actual use to when the probe is enabled. */
204 if (MONO_PROBE_GC_END_ENABLED ())
210 * mono_gc_max_generation:
212 * Get the maximum generation number used by the current garbage
213 * collector. The value will be 0 for the Boehm collector, 1 or more
214 * for the generational collectors.
216 * Returns: the maximum generation number.
219 mono_gc_max_generation (void)
225 * mono_gc_get_generation:
226 * @object: a managed object
228 * Get the garbage collector's generation that @object belongs to.
229 * Use this has a hint only.
231 * Returns: a garbage collector generation number
234 mono_gc_get_generation (MonoObject *object)
240 * mono_gc_collection_count:
241 * @generation: a GC generation number
243 * Get how many times a garbage collection has been performed
244 * for the given @generation number.
246 * Returns: the number of garbage collections
249 mono_gc_collection_count (int generation)
255 * mono_gc_add_memory_pressure:
256 * @value: amount of bytes
258 * Adjust the garbage collector's view of how many bytes of memory
259 * are indirectly referenced by managed objects (for example unmanaged
260 * memory holding image or other binary data).
261 * This is a hint only to the garbage collector algorithm.
262 * Note that negative amounts of @value will decrease the memory
266 mono_gc_add_memory_pressure (gint64 value)
271 * mono_gc_get_used_size:
273 * Get the approximate amount of memory used by managed objects.
275 * Returns: the amount of memory used in bytes
278 mono_gc_get_used_size (void)
280 return GC_get_heap_size () - GC_get_free_bytes ();
284 * mono_gc_get_heap_size:
286 * Get the amount of memory used by the garbage collector.
288 * Returns: the size of the heap in bytes
291 mono_gc_get_heap_size (void)
293 return GC_get_heap_size ();
297 mono_gc_disable (void)
299 #ifdef HAVE_GC_ENABLE
302 g_assert_not_reached ();
307 mono_gc_enable (void)
309 #ifdef HAVE_GC_ENABLE
312 g_assert_not_reached ();
317 mono_gc_is_gc_thread (void)
319 #if GC_VERSION_MAJOR >= 7
321 #elif defined(USE_INCLUDED_LIBGC)
322 return GC_thread_is_registered ();
328 extern int GC_thread_register_foreign (void *base_addr);
331 mono_gc_register_thread (void *baseptr)
333 return mono_thread_info_attach (baseptr) != NULL;
337 boehm_thread_register (MonoThreadInfo* info, void *baseptr)
339 #if GC_VERSION_MAJOR >= 7
340 struct GC_stack_base sb;
343 res = GC_get_stack_base (&sb);
344 if (res != GC_SUCCESS) {
345 sb.mem_base = baseptr;
347 /* Can't determine the register stack bounds */
348 g_error ("mono_gc_register_thread failed ().\n");
351 res = GC_register_my_thread (&sb);
352 if ((res != GC_SUCCESS) && (res != GC_DUPLICATE)) {
353 g_warning ("GC_register_my_thread () failed.\n");
358 if (mono_gc_is_gc_thread())
360 #if defined(USE_INCLUDED_LIBGC) && !defined(HOST_WIN32)
361 return GC_thread_register_foreign (baseptr) ? info : NULL;
369 mono_object_is_alive (MonoObject* o)
371 #ifdef USE_INCLUDED_LIBGC
372 return GC_is_marked ((gpointer)o);
379 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
384 #ifdef USE_INCLUDED_LIBGC
386 static gint64 gc_start_time;
389 on_gc_notification (GCEventType event)
391 MonoGCEvent e = (MonoGCEvent)event;
393 if (e == MONO_GC_EVENT_PRE_STOP_WORLD)
394 mono_thread_info_suspend_lock ();
395 else if (e == MONO_GC_EVENT_POST_START_WORLD)
396 mono_thread_info_suspend_unlock ();
398 if (e == MONO_GC_EVENT_START) {
399 if (mono_perfcounters)
400 mono_perfcounters->gc_collections0++;
401 mono_stats.major_gc_count ++;
402 gc_start_time = mono_100ns_ticks ();
403 } else if (e == MONO_GC_EVENT_END) {
404 if (mono_perfcounters) {
405 guint64 heap_size = GC_get_heap_size ();
406 guint64 used_size = heap_size - GC_get_free_bytes ();
407 mono_perfcounters->gc_total_bytes = used_size;
408 mono_perfcounters->gc_committed_bytes = heap_size;
409 mono_perfcounters->gc_reserved_bytes = heap_size;
410 mono_perfcounters->gc_gen0size = heap_size;
412 mono_stats.major_gc_time_usecs += (mono_100ns_ticks () - gc_start_time) / 10;
413 mono_trace_message (MONO_TRACE_GC, "gc took %d usecs", (mono_100ns_ticks () - gc_start_time) / 10);
415 mono_profiler_gc_event (e, 0);
419 on_gc_heap_resize (size_t new_size)
421 guint64 heap_size = GC_get_heap_size ();
422 if (mono_perfcounters) {
423 mono_perfcounters->gc_committed_bytes = heap_size;
424 mono_perfcounters->gc_reserved_bytes = heap_size;
425 mono_perfcounters->gc_gen0size = heap_size;
427 mono_profiler_gc_heap_resize (new_size);
431 mono_gc_enable_events (void)
433 GC_notify_event = on_gc_notification;
434 GC_on_heap_resize = on_gc_heap_resize;
440 mono_gc_enable_events (void)
447 mono_gc_register_root (char *start, size_t size, void *descr)
449 /* for some strange reason, they want one extra byte on the end */
450 GC_add_roots (start, start + size + 1);
456 mono_gc_deregister_root (char* addr)
459 /* FIXME: libgc doesn't define this work win32 for some reason */
460 /* FIXME: No size info */
461 GC_remove_roots (addr, addr + sizeof (gpointer) + 1);
466 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
468 /* libgc requires that we use HIDE_POINTER... */
469 *link_addr = (void*)HIDE_POINTER (obj);
470 GC_GENERAL_REGISTER_DISAPPEARING_LINK (link_addr, obj);
474 mono_gc_weak_link_remove (void **link_addr)
476 GC_unregister_disappearing_link (link_addr);
481 reveal_link (gpointer link_addr)
483 void **link_a = link_addr;
484 return REVEAL_POINTER (*link_a);
488 mono_gc_weak_link_get (void **link_addr)
490 MonoObject *obj = GC_call_with_alloc_lock (reveal_link, link_addr);
491 if (obj == (MonoObject *) -1)
497 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
499 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
503 mono_gc_make_descr_for_object (gsize *bitmap, int numbits, size_t obj_size)
505 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
509 mono_gc_make_descr_for_array (int vector, gsize *elem_bitmap, int numbits, size_t elem_size)
511 /* libgc has no usable support for arrays... */
512 return GC_NO_DESCRIPTOR;
516 mono_gc_make_descr_from_bitmap (gsize *bitmap, int numbits)
518 #ifdef HAVE_GC_GCJ_MALLOC
519 /* It seems there are issues when the bitmap doesn't fit: play it safe */
521 return GC_NO_DESCRIPTOR;
523 return (gpointer)GC_make_descriptor ((GC_bitmap)bitmap, numbits);
530 mono_gc_make_root_descr_all_refs (int numbits)
536 mono_gc_alloc_fixed (size_t size, void *descr)
538 /* To help track down typed allocation bugs */
542 if (count == atoi (getenv ("COUNT2")))
544 if (count > atoi (getenv ("COUNT2")))
545 return GC_MALLOC (size);
549 return GC_MALLOC_EXPLICITLY_TYPED (size, (GC_descr)descr);
551 return GC_MALLOC (size);
555 mono_gc_free_fixed (void* addr)
560 mono_gc_invoke_finalizers (void)
562 /* There is a bug in GC_invoke_finalizer () in versions <= 6.2alpha4:
563 * the 'mem_freed' variable is not initialized when there are no
564 * objects to finalize, which leads to strange behavior later on.
565 * The check is necessary to work around that bug.
567 if (GC_should_invoke_finalizers ())
568 return GC_invoke_finalizers ();
573 mono_gc_pending_finalizers (void)
575 return GC_should_invoke_finalizers ();
579 * LOCKING: Assumes the domain_finalizers lock is held.
582 add_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
586 if (!domain->track_resurrection_objects_hash)
587 domain->track_resurrection_objects_hash = g_hash_table_new (mono_aligned_addr_hash, NULL);
589 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
590 refs = g_slist_prepend (refs, GUINT_TO_POINTER (gchandle));
591 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
595 mono_gc_add_weak_track_handle (MonoObject *obj, guint32 handle)
602 domain = mono_object_get_domain (obj);
604 mono_domain_finalizers_lock (domain);
606 add_weak_track_handle_internal (domain, obj, handle);
608 g_hash_table_insert (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (handle), obj);
610 mono_domain_finalizers_unlock (domain);
614 * LOCKING: Assumes the domain_finalizers lock is held.
617 remove_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
621 if (!domain->track_resurrection_objects_hash)
624 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
625 refs = g_slist_remove (refs, GUINT_TO_POINTER (gchandle));
626 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
630 mono_gc_change_weak_track_handle (MonoObject *old_obj, MonoObject *obj, guint32 gchandle)
632 MonoDomain *domain = mono_domain_get ();
634 mono_domain_finalizers_lock (domain);
637 remove_weak_track_handle_internal (domain, old_obj, gchandle);
639 add_weak_track_handle_internal (domain, obj, gchandle);
641 mono_domain_finalizers_unlock (domain);
645 mono_gc_remove_weak_track_handle (guint32 gchandle)
647 MonoDomain *domain = mono_domain_get ();
650 /* Clean our entries in the two hashes in MonoDomain */
652 mono_domain_finalizers_lock (domain);
654 /* Get the original object this handle pointed to */
655 obj = g_hash_table_lookup (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
657 g_hash_table_remove (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
659 remove_weak_track_handle_internal (domain, obj, gchandle);
662 mono_domain_finalizers_unlock (domain);
666 mono_gc_remove_weak_track_object (MonoDomain *domain, MonoObject *obj)
670 if (domain->track_resurrection_objects_hash) {
671 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
675 * Since we don't run finalizers again for resurrected objects,
676 * no need to keep these around.
678 g_hash_table_remove (domain->track_resurrection_objects_hash, obj);
685 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
687 *(void**)field_ptr = value;
691 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
693 *(void**)slot_ptr = value;
697 mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
699 mono_gc_memmove (dest_ptr, src_ptr, count * sizeof (gpointer));
703 mono_gc_wbarrier_generic_store (gpointer ptr, MonoObject* value)
705 *(void**)ptr = value;
709 mono_gc_wbarrier_generic_nostore (gpointer ptr)
714 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
716 mono_gc_memmove (dest, src, count * mono_class_value_size (klass, NULL));
720 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
722 /* do not copy the sync state */
723 mono_gc_memmove ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
724 mono_object_class (obj)->instance_size - sizeof (MonoObject));
728 mono_gc_clear_domain (MonoDomain *domain)
733 mono_gc_get_suspend_signal (void)
735 #ifdef USE_INCLUDED_GC
736 return GC_get_suspend_signal ();
742 #if defined(USE_INCLUDED_LIBGC) && defined(USE_COMPILER_TLS) && defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
743 extern __thread MONO_TLS_FAST void* GC_thread_tls;
744 #include "metadata-internals.h"
750 while (!(v & (1 << i)))
757 ATYPE_FREEPTR_FOR_BOX,
765 create_allocator (int atype, int offset)
767 int index_var, bytes_var, my_fl_var, my_entry_var;
768 guint32 no_freelist_branch, not_small_enough_branch = 0;
769 guint32 size_overflow_branch = 0;
770 MonoMethodBuilder *mb;
772 MonoMethodSignature *csig;
773 AllocatorWrapperInfo *info;
775 if (atype == ATYPE_STRING) {
776 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
777 csig->ret = &mono_defaults.string_class->byval_arg;
778 csig->params [0] = &mono_defaults.int_class->byval_arg;
779 csig->params [1] = &mono_defaults.int32_class->byval_arg;
781 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
782 csig->ret = &mono_defaults.object_class->byval_arg;
783 csig->params [0] = &mono_defaults.int_class->byval_arg;
786 mb = mono_mb_new (mono_defaults.object_class, "Alloc", MONO_WRAPPER_ALLOC);
787 bytes_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
788 if (atype == ATYPE_STRING) {
789 /* a string alloator method takes the args: (vtable, len) */
790 /* bytes = (sizeof (MonoString) + ((len + 1) * 2)); */
791 mono_mb_emit_ldarg (mb, 1);
792 mono_mb_emit_icon (mb, 1);
793 mono_mb_emit_byte (mb, MONO_CEE_ADD);
794 mono_mb_emit_icon (mb, 1);
795 mono_mb_emit_byte (mb, MONO_CEE_SHL);
796 // sizeof (MonoString) might include padding
797 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, chars));
798 mono_mb_emit_byte (mb, MONO_CEE_ADD);
799 mono_mb_emit_stloc (mb, bytes_var);
801 /* bytes = vtable->klass->instance_size */
802 mono_mb_emit_ldarg (mb, 0);
803 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoVTable, klass));
804 mono_mb_emit_byte (mb, MONO_CEE_ADD);
805 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
806 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoClass, instance_size));
807 mono_mb_emit_byte (mb, MONO_CEE_ADD);
808 /* FIXME: assert instance_size stays a 4 byte integer */
809 mono_mb_emit_byte (mb, MONO_CEE_LDIND_U4);
810 mono_mb_emit_stloc (mb, bytes_var);
813 /* this is needed for strings/arrays only as the other big types are never allocated with this method */
814 if (atype == ATYPE_STRING) {
816 /* if (!SMALL_ENOUGH (bytes)) jump slow_path;*/
817 mono_mb_emit_ldloc (mb, bytes_var);
818 mono_mb_emit_icon (mb, (NFREELISTS-1) * GRANULARITY);
819 not_small_enough_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
820 /* check for overflow */
821 mono_mb_emit_ldloc (mb, bytes_var);
822 mono_mb_emit_icon (mb, sizeof (MonoString));
823 size_overflow_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
826 /* int index = INDEX_FROM_BYTES(bytes); */
827 index_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
829 mono_mb_emit_ldloc (mb, bytes_var);
830 mono_mb_emit_icon (mb, GRANULARITY - 1);
831 mono_mb_emit_byte (mb, MONO_CEE_ADD);
832 mono_mb_emit_icon (mb, shift_amount (GRANULARITY));
833 mono_mb_emit_byte (mb, MONO_CEE_SHR_UN);
834 mono_mb_emit_icon (mb, shift_amount (sizeof (gpointer)));
835 mono_mb_emit_byte (mb, MONO_CEE_SHL);
836 /* index var is already adjusted into bytes */
837 mono_mb_emit_stloc (mb, index_var);
839 my_fl_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
840 my_entry_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
841 /* my_fl = ((GC_thread)tsd) -> ptrfree_freelists + index; */
842 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
843 mono_mb_emit_byte (mb, 0x0D); /* CEE_MONO_TLS */
844 mono_mb_emit_i4 (mb, offset);
845 if (atype == ATYPE_FREEPTR || atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING)
846 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, ptrfree_freelists));
847 else if (atype == ATYPE_NORMAL)
848 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, normal_freelists));
849 else if (atype == ATYPE_GCJ)
850 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, gcj_freelists));
852 g_assert_not_reached ();
853 mono_mb_emit_byte (mb, MONO_CEE_ADD);
854 mono_mb_emit_ldloc (mb, index_var);
855 mono_mb_emit_byte (mb, MONO_CEE_ADD);
856 mono_mb_emit_stloc (mb, my_fl_var);
858 /* my_entry = *my_fl; */
859 mono_mb_emit_ldloc (mb, my_fl_var);
860 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
861 mono_mb_emit_stloc (mb, my_entry_var);
863 /* if (EXPECT((word)my_entry >= HBLKSIZE, 1)) { */
864 mono_mb_emit_ldloc (mb, my_entry_var);
865 mono_mb_emit_icon (mb, HBLKSIZE);
866 no_freelist_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
868 /* ptr_t next = obj_link(my_entry); *my_fl = next; */
869 mono_mb_emit_ldloc (mb, my_fl_var);
870 mono_mb_emit_ldloc (mb, my_entry_var);
871 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
872 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
874 /* set the vtable and clear the words in the object */
875 mono_mb_emit_ldloc (mb, my_entry_var);
876 mono_mb_emit_ldarg (mb, 0);
877 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
879 if (atype == ATYPE_FREEPTR) {
880 int start_var, end_var, start_loop;
881 /* end = my_entry + bytes; start = my_entry + sizeof (gpointer);
883 start_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
884 end_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
885 mono_mb_emit_ldloc (mb, my_entry_var);
886 mono_mb_emit_ldloc (mb, bytes_var);
887 mono_mb_emit_byte (mb, MONO_CEE_ADD);
888 mono_mb_emit_stloc (mb, end_var);
889 mono_mb_emit_ldloc (mb, my_entry_var);
890 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
891 mono_mb_emit_byte (mb, MONO_CEE_ADD);
892 mono_mb_emit_stloc (mb, start_var);
896 * } while (start < end);
898 start_loop = mono_mb_get_label (mb);
899 mono_mb_emit_ldloc (mb, start_var);
900 mono_mb_emit_icon (mb, 0);
901 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
902 mono_mb_emit_ldloc (mb, start_var);
903 mono_mb_emit_icon (mb, sizeof (gpointer));
904 mono_mb_emit_byte (mb, MONO_CEE_ADD);
905 mono_mb_emit_stloc (mb, start_var);
907 mono_mb_emit_ldloc (mb, start_var);
908 mono_mb_emit_ldloc (mb, end_var);
909 mono_mb_emit_byte (mb, MONO_CEE_BLT_UN_S);
910 mono_mb_emit_byte (mb, start_loop - (mono_mb_get_label (mb) + 1));
911 } else if (atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING) {
912 /* need to clear just the sync pointer */
913 mono_mb_emit_ldloc (mb, my_entry_var);
914 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
915 mono_mb_emit_byte (mb, MONO_CEE_ADD);
916 mono_mb_emit_icon (mb, 0);
917 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
920 if (atype == ATYPE_STRING) {
921 /* need to set length and clear the last char */
922 /* s->length = len; */
923 mono_mb_emit_ldloc (mb, my_entry_var);
924 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, length));
925 mono_mb_emit_byte (mb, MONO_CEE_ADD);
926 mono_mb_emit_ldarg (mb, 1);
927 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
928 /* s->chars [len] = 0; */
929 mono_mb_emit_ldloc (mb, my_entry_var);
930 mono_mb_emit_ldloc (mb, bytes_var);
931 mono_mb_emit_icon (mb, 2);
932 mono_mb_emit_byte (mb, MONO_CEE_SUB);
933 mono_mb_emit_byte (mb, MONO_CEE_ADD);
934 mono_mb_emit_icon (mb, 0);
935 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
938 /* return my_entry; */
939 mono_mb_emit_ldloc (mb, my_entry_var);
940 mono_mb_emit_byte (mb, MONO_CEE_RET);
942 mono_mb_patch_short_branch (mb, no_freelist_branch);
943 if (not_small_enough_branch > 0)
944 mono_mb_patch_short_branch (mb, not_small_enough_branch);
945 if (size_overflow_branch > 0)
946 mono_mb_patch_short_branch (mb, size_overflow_branch);
947 /* the slow path: we just call back into the runtime */
948 if (atype == ATYPE_STRING) {
949 mono_mb_emit_ldarg (mb, 1);
950 mono_mb_emit_icall (mb, mono_string_alloc);
952 mono_mb_emit_ldarg (mb, 0);
953 mono_mb_emit_icall (mb, mono_object_new_specific);
956 mono_mb_emit_byte (mb, MONO_CEE_RET);
958 res = mono_mb_create_method (mb, csig, 8);
960 mono_method_get_header (res)->init_locals = FALSE;
962 info = mono_image_alloc0 (mono_defaults.corlib, sizeof (AllocatorWrapperInfo));
963 info->gc_name = "boehm";
964 info->alloc_type = atype;
965 mono_marshal_set_wrapper_info (res, info);
970 static MonoMethod* alloc_method_cache [ATYPE_NUM];
973 mono_gc_is_critical_method (MonoMethod *method)
977 for (i = 0; i < ATYPE_NUM; ++i)
978 if (method == alloc_method_cache [i])
985 * If possible, generate a managed method that can quickly allocate objects in class
986 * @klass. The method will typically have an thread-local inline allocation sequence.
987 * The signature of the called method is:
988 * object allocate (MonoVTable *vtable)
989 * Some of the logic here is similar to mono_class_get_allocation_ftn () i object.c,
991 * The thread local alloc logic is taken from libgc/pthread_support.c.
995 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
999 MonoClass *klass = vtable->klass;
1000 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
1002 /*g_print ("thread tls: %d\n", offset);*/
1005 if (!SMALL_ENOUGH (klass->instance_size))
1007 if (mono_class_has_finalizer (klass) || klass->marshalbyref || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
1011 if (klass->byval_arg.type == MONO_TYPE_STRING) {
1012 atype = ATYPE_STRING;
1013 } else if (!klass->has_references) {
1015 atype = ATYPE_FREEPTR_FOR_BOX;
1017 atype = ATYPE_FREEPTR;
1021 * disabled because we currently do a runtime choice anyway, to
1022 * deal with multiple appdomains.
1023 if (vtable->gc_descr != GC_NO_DESCRIPTOR)
1026 atype = ATYPE_NORMAL;
1029 return mono_gc_get_managed_allocator_by_type (atype);
1033 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
1039 * mono_gc_get_managed_allocator_by_type:
1041 * Return a managed allocator method corresponding to allocator type ATYPE.
1044 mono_gc_get_managed_allocator_by_type (int atype)
1048 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
1050 mono_loader_lock ();
1051 res = alloc_method_cache [atype];
1053 res = alloc_method_cache [atype] = create_allocator (atype, offset);
1054 mono_loader_unlock ();
1059 mono_gc_get_managed_allocator_types (void)
1065 mono_gc_get_write_barrier (void)
1067 g_assert_not_reached ();
1074 mono_gc_is_critical_method (MonoMethod *method)
1080 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
1086 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
1092 mono_gc_get_managed_allocator_by_type (int atype)
1098 mono_gc_get_managed_allocator_types (void)
1104 mono_gc_get_write_barrier (void)
1106 g_assert_not_reached ();
1113 mono_gc_get_gc_name (void)
1119 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
1121 return GC_call_with_alloc_lock (func, data);
1125 mono_gc_get_description (void)
1127 return g_strdup (DEFAULT_GC_NAME);
1131 mono_gc_set_desktop_mode (void)
1137 mono_gc_is_moving (void)
1143 mono_gc_is_disabled (void)
1145 if (GC_dont_gc || g_getenv ("GC_DONT_GC"))
1152 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
1154 g_assert_not_reached ();
1159 mono_gc_get_card_table (int *shift_bits, gpointer *card_mask)
1161 g_assert_not_reached ();
1166 mono_gc_get_nursery (int *shift_bits, size_t *size)
1172 mono_gc_precise_stack_mark_enabled (void)
1178 mono_gc_get_logfile (void)
1184 mono_gc_conservatively_scan_area (void *start, void *end)
1186 g_assert_not_reached ();
1190 mono_gc_scan_object (void *obj)
1192 g_assert_not_reached ();
1197 mono_gc_get_bitmap_for_descr (void *descr, int *numbits)
1199 g_assert_not_reached ();
1204 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
1209 * These will call the redefined versions in libgc.
1215 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
1217 return mono_threads_pthread_create (new_thread, attr, start_routine, arg);
1221 mono_gc_pthread_join (pthread_t thread, void **retval)
1223 return pthread_join (thread, retval);
1227 mono_gc_pthread_detach (pthread_t thread)
1229 return pthread_detach (thread);
1235 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
1237 #ifdef USE_INCLUDED_LIBGC
1238 return GC_DllMain (module_handle, reason, reserved);
1245 #endif /* no Boehm GC */