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 2004-2011 Novell, Inc (http://www.novell.com)
6 * Copyright 2011-2012 Xamarin, Inc (http://www.xamarin.com)
13 #define GC_I_HIDE_POINTERS
14 #include <mono/metadata/gc-internal.h>
15 #include <mono/metadata/mono-gc.h>
16 #include <mono/metadata/gc-internal.h>
17 #include <mono/metadata/profiler-private.h>
18 #include <mono/metadata/class-internals.h>
19 #include <mono/metadata/method-builder.h>
20 #include <mono/metadata/opcodes.h>
21 #include <mono/metadata/domain-internals.h>
22 #include <mono/metadata/metadata-internals.h>
23 #include <mono/metadata/marshal.h>
24 #include <mono/metadata/runtime.h>
25 #include <mono/utils/mono-logger-internal.h>
26 #include <mono/utils/mono-time.h>
27 #include <mono/utils/mono-threads.h>
28 #include <mono/utils/dtrace.h>
29 #include <mono/utils/gc_wrapper.h>
33 #ifdef USE_INCLUDED_LIBGC
36 #define THREAD_LOCAL_ALLOC 1
37 #include "private/pthread_support.h"
40 #define GC_NO_DESCRIPTOR ((gpointer)(0 | GC_DS_LENGTH))
41 /*Boehm max heap cannot be smaller than 16MB*/
42 #define MIN_BOEHM_MAX_HEAP_SIZE_IN_MB 16
43 #define MIN_BOEHM_MAX_HEAP_SIZE (MIN_BOEHM_MAX_HEAP_SIZE_IN_MB << 20)
45 static gboolean gc_initialized = FALSE;
48 boehm_thread_register (MonoThreadInfo* info, void *baseptr);
51 mono_gc_warning (char *msg, GC_word arg)
53 mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_GC, msg, (unsigned long)arg);
57 mono_gc_base_init (void)
59 MonoThreadInfoCallbacks cb;
66 * Handle the case when we are called from a thread different from the main thread,
68 * FIXME: Move this to libgc where it belongs.
70 * we used to do this only when running on valgrind,
71 * but it happens also in other setups.
73 #if defined(HAVE_PTHREAD_GETATTR_NP) && defined(HAVE_PTHREAD_ATTR_GETSTACK)
78 pthread_getattr_np (pthread_self (), &attr);
79 pthread_attr_getstack (&attr, &sstart, &size);
80 pthread_attr_destroy (&attr);
81 /*g_print ("stackbottom pth is: %p\n", (char*)sstart + size);*/
84 * The calculation above doesn't seem to work on ia64, also we need to set
85 * GC_register_stackbottom as well, but don't know how.
88 /* apparently with some linuxthreads implementations sstart can be NULL,
89 * fallback to the more imprecise method (bug# 78096).
92 GC_stackbottom = (char*)sstart + size;
95 gsize stack_bottom = (gsize)&dummy;
97 stack_bottom &= ~4095;
98 GC_stackbottom = (char*)stack_bottom;
102 #elif defined(HAVE_PTHREAD_GET_STACKSIZE_NP) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
103 GC_stackbottom = (char*)pthread_get_stackaddr_np (pthread_self ());
104 #elif defined(__OpenBSD__)
105 # include <pthread_np.h>
110 rslt = pthread_stackseg_np(pthread_self(), &ss);
111 g_assert (rslt == 0);
113 GC_stackbottom = (char*)ss.ss_sp;
115 #elif defined(__native_client__)
116 /* Do nothing, GC_stackbottom is set correctly in libgc */
120 gsize stack_bottom = (gsize)&dummy;
121 stack_bottom += 4095;
122 stack_bottom &= ~4095;
123 /*g_print ("stackbottom is: %p\n", (char*)stack_bottom);*/
124 GC_stackbottom = (char*)stack_bottom;
128 #if !defined(PLATFORM_ANDROID)
129 /* If GC_no_dls is set to true, GC_find_limit is not called. This causes a seg fault on Android. */
133 GC_oom_fn = mono_gc_out_of_memory;
134 GC_set_warn_proc (mono_gc_warning);
135 GC_finalize_on_demand = 1;
136 GC_finalizer_notifier = mono_gc_finalize_notify;
138 #ifdef HAVE_GC_GCJ_MALLOC
139 GC_init_gcj_malloc (5, NULL);
142 #ifdef HAVE_GC_ALLOW_REGISTER_THREADS
143 GC_allow_register_threads();
146 if ((env = getenv ("MONO_GC_PARAMS"))) {
147 char **ptr, **opts = g_strsplit (env, ",", -1);
148 for (ptr = opts; *ptr; ++ptr) {
150 if (g_str_has_prefix (opt, "max-heap-size=")) {
153 opt = strchr (opt, '=') + 1;
154 if (*opt && mono_gc_parse_environment_string_extract_number (opt, &max_heap)) {
155 if (max_heap < MIN_BOEHM_MAX_HEAP_SIZE) {
156 fprintf (stderr, "max-heap-size must be at least %dMb.\n", MIN_BOEHM_MAX_HEAP_SIZE_IN_MB);
159 GC_set_max_heap_size (max_heap);
161 fprintf (stderr, "max-heap-size must be an integer.\n");
166 /* Could be a parameter for sgen */
168 fprintf (stderr, "MONO_GC_PARAMS must be a comma-delimited list of one or more of the following:\n");
169 fprintf (stderr, " max-heap-size=N (where N is an integer, possibly with a k, m or a g suffix)\n");
177 memset (&cb, 0, sizeof (cb));
178 cb.thread_register = boehm_thread_register;
179 cb.mono_method_is_critical = (gpointer)mono_runtime_is_critical_method;
181 cb.mono_gc_pthread_create = (gpointer)mono_gc_pthread_create;
184 mono_threads_init (&cb, sizeof (MonoThreadInfo));
186 mono_gc_enable_events ();
187 gc_initialized = TRUE;
192 * @generation: GC generation identifier
194 * Perform a garbage collection for the given generation, higher numbers
195 * mean usually older objects. Collecting a high-numbered generation
196 * implies collecting also the lower-numbered generations.
197 * The maximum value for @generation can be retrieved with a call to
198 * mono_gc_max_generation(), so this function is usually called as:
200 * mono_gc_collect (mono_gc_max_generation ());
203 mono_gc_collect (int generation)
205 MONO_PROBE_GC_BEGIN (generation);
207 mono_perfcounters->gc_induced++;
210 MONO_PROBE_GC_END (generation);
211 #if defined(ENABLE_DTRACE) && defined(__sun__)
212 /* This works around a dtrace -G problem on Solaris.
213 Limit its actual use to when the probe is enabled. */
214 if (MONO_PROBE_GC_END_ENABLED ())
220 * mono_gc_max_generation:
222 * Get the maximum generation number used by the current garbage
223 * collector. The value will be 0 for the Boehm collector, 1 or more
224 * for the generational collectors.
226 * Returns: the maximum generation number.
229 mono_gc_max_generation (void)
235 * mono_gc_get_generation:
236 * @object: a managed object
238 * Get the garbage collector's generation that @object belongs to.
239 * Use this has a hint only.
241 * Returns: a garbage collector generation number
244 mono_gc_get_generation (MonoObject *object)
250 * mono_gc_collection_count:
251 * @generation: a GC generation number
253 * Get how many times a garbage collection has been performed
254 * for the given @generation number.
256 * Returns: the number of garbage collections
259 mono_gc_collection_count (int generation)
265 * mono_gc_add_memory_pressure:
266 * @value: amount of bytes
268 * Adjust the garbage collector's view of how many bytes of memory
269 * are indirectly referenced by managed objects (for example unmanaged
270 * memory holding image or other binary data).
271 * This is a hint only to the garbage collector algorithm.
272 * Note that negative amounts of @value will decrease the memory
276 mono_gc_add_memory_pressure (gint64 value)
281 * mono_gc_get_used_size:
283 * Get the approximate amount of memory used by managed objects.
285 * Returns: the amount of memory used in bytes
288 mono_gc_get_used_size (void)
290 return GC_get_heap_size () - GC_get_free_bytes ();
294 * mono_gc_get_heap_size:
296 * Get the amount of memory used by the garbage collector.
298 * Returns: the size of the heap in bytes
301 mono_gc_get_heap_size (void)
303 return GC_get_heap_size ();
307 mono_gc_disable (void)
309 #ifdef HAVE_GC_ENABLE
312 g_assert_not_reached ();
317 mono_gc_enable (void)
319 #ifdef HAVE_GC_ENABLE
322 g_assert_not_reached ();
327 mono_gc_is_gc_thread (void)
329 #if GC_VERSION_MAJOR >= 7
331 #elif defined(USE_INCLUDED_LIBGC)
332 return GC_thread_is_registered ();
338 extern int GC_thread_register_foreign (void *base_addr);
341 mono_gc_register_thread (void *baseptr)
343 return mono_thread_info_attach (baseptr) != NULL;
347 boehm_thread_register (MonoThreadInfo* info, void *baseptr)
349 #if GC_VERSION_MAJOR >= 7
350 struct GC_stack_base sb;
353 res = GC_get_stack_base (&sb);
354 if (res != GC_SUCCESS) {
355 sb.mem_base = baseptr;
357 /* Can't determine the register stack bounds */
358 g_error ("mono_gc_register_thread failed ().\n");
361 res = GC_register_my_thread (&sb);
362 if ((res != GC_SUCCESS) && (res != GC_DUPLICATE)) {
363 g_warning ("GC_register_my_thread () failed.\n");
368 if (mono_gc_is_gc_thread())
370 #if defined(USE_INCLUDED_LIBGC) && !defined(HOST_WIN32)
371 return GC_thread_register_foreign (baseptr) ? info : NULL;
379 mono_object_is_alive (MonoObject* o)
381 #ifdef USE_INCLUDED_LIBGC
382 return GC_is_marked ((gpointer)o);
389 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
394 #ifdef USE_INCLUDED_LIBGC
396 static gint64 gc_start_time;
399 on_gc_notification (GCEventType event)
401 MonoGCEvent e = (MonoGCEvent)event;
403 if (e == MONO_GC_EVENT_PRE_STOP_WORLD)
404 mono_thread_info_suspend_lock ();
405 else if (e == MONO_GC_EVENT_POST_START_WORLD)
406 mono_thread_info_suspend_unlock ();
408 if (e == MONO_GC_EVENT_START) {
409 if (mono_perfcounters)
410 mono_perfcounters->gc_collections0++;
411 mono_stats.major_gc_count ++;
412 gc_start_time = mono_100ns_ticks ();
413 } else if (e == MONO_GC_EVENT_END) {
414 if (mono_perfcounters) {
415 guint64 heap_size = GC_get_heap_size ();
416 guint64 used_size = heap_size - GC_get_free_bytes ();
417 mono_perfcounters->gc_total_bytes = used_size;
418 mono_perfcounters->gc_committed_bytes = heap_size;
419 mono_perfcounters->gc_reserved_bytes = heap_size;
420 mono_perfcounters->gc_gen0size = heap_size;
422 mono_stats.major_gc_time_usecs += (mono_100ns_ticks () - gc_start_time) / 10;
423 mono_trace_message (MONO_TRACE_GC, "gc took %d usecs", (mono_100ns_ticks () - gc_start_time) / 10);
425 mono_profiler_gc_event (e, 0);
429 on_gc_heap_resize (size_t new_size)
431 guint64 heap_size = GC_get_heap_size ();
432 if (mono_perfcounters) {
433 mono_perfcounters->gc_committed_bytes = heap_size;
434 mono_perfcounters->gc_reserved_bytes = heap_size;
435 mono_perfcounters->gc_gen0size = heap_size;
437 mono_profiler_gc_heap_resize (new_size);
441 mono_gc_enable_events (void)
443 GC_notify_event = on_gc_notification;
444 GC_on_heap_resize = on_gc_heap_resize;
450 mono_gc_enable_events (void)
457 mono_gc_register_root (char *start, size_t size, void *descr)
459 /* for some strange reason, they want one extra byte on the end */
460 GC_add_roots (start, start + size + 1);
466 mono_gc_deregister_root (char* addr)
469 /* FIXME: libgc doesn't define this work win32 for some reason */
470 /* FIXME: No size info */
471 GC_remove_roots (addr, addr + sizeof (gpointer) + 1);
476 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
478 /* libgc requires that we use HIDE_POINTER... */
479 *link_addr = (void*)HIDE_POINTER (obj);
480 GC_GENERAL_REGISTER_DISAPPEARING_LINK (link_addr, obj);
484 mono_gc_weak_link_remove (void **link_addr)
486 GC_unregister_disappearing_link (link_addr);
491 reveal_link (gpointer link_addr)
493 void **link_a = link_addr;
494 return REVEAL_POINTER (*link_a);
498 mono_gc_weak_link_get (void **link_addr)
500 MonoObject *obj = GC_call_with_alloc_lock (reveal_link, link_addr);
501 if (obj == (MonoObject *) -1)
507 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
509 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
513 mono_gc_make_descr_for_object (gsize *bitmap, int numbits, size_t obj_size)
515 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
519 mono_gc_make_descr_for_array (int vector, gsize *elem_bitmap, int numbits, size_t elem_size)
521 /* libgc has no usable support for arrays... */
522 return GC_NO_DESCRIPTOR;
526 mono_gc_make_descr_from_bitmap (gsize *bitmap, int numbits)
528 #ifdef HAVE_GC_GCJ_MALLOC
529 /* It seems there are issues when the bitmap doesn't fit: play it safe */
531 return GC_NO_DESCRIPTOR;
533 return (gpointer)GC_make_descriptor ((GC_bitmap)bitmap, numbits);
540 mono_gc_make_root_descr_all_refs (int numbits)
546 mono_gc_alloc_fixed (size_t size, void *descr)
548 /* To help track down typed allocation bugs */
552 if (count == atoi (getenv ("COUNT2")))
554 if (count > atoi (getenv ("COUNT2")))
555 return GC_MALLOC (size);
559 return GC_MALLOC_EXPLICITLY_TYPED (size, (GC_descr)descr);
561 return GC_MALLOC (size);
565 mono_gc_free_fixed (void* addr)
570 mono_gc_invoke_finalizers (void)
572 /* There is a bug in GC_invoke_finalizer () in versions <= 6.2alpha4:
573 * the 'mem_freed' variable is not initialized when there are no
574 * objects to finalize, which leads to strange behavior later on.
575 * The check is necessary to work around that bug.
577 if (GC_should_invoke_finalizers ())
578 return GC_invoke_finalizers ();
583 mono_gc_pending_finalizers (void)
585 return GC_should_invoke_finalizers ();
589 * LOCKING: Assumes the domain_finalizers lock is held.
592 add_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
596 if (!domain->track_resurrection_objects_hash)
597 domain->track_resurrection_objects_hash = g_hash_table_new (mono_aligned_addr_hash, NULL);
599 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
600 refs = g_slist_prepend (refs, GUINT_TO_POINTER (gchandle));
601 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
605 mono_gc_add_weak_track_handle (MonoObject *obj, guint32 handle)
612 domain = mono_object_get_domain (obj);
614 mono_domain_finalizers_lock (domain);
616 add_weak_track_handle_internal (domain, obj, handle);
618 g_hash_table_insert (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (handle), obj);
620 mono_domain_finalizers_unlock (domain);
624 * LOCKING: Assumes the domain_finalizers lock is held.
627 remove_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
631 if (!domain->track_resurrection_objects_hash)
634 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
635 refs = g_slist_remove (refs, GUINT_TO_POINTER (gchandle));
636 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
640 mono_gc_change_weak_track_handle (MonoObject *old_obj, MonoObject *obj, guint32 gchandle)
642 MonoDomain *domain = mono_domain_get ();
644 mono_domain_finalizers_lock (domain);
647 remove_weak_track_handle_internal (domain, old_obj, gchandle);
649 add_weak_track_handle_internal (domain, obj, gchandle);
651 mono_domain_finalizers_unlock (domain);
655 mono_gc_remove_weak_track_handle (guint32 gchandle)
657 MonoDomain *domain = mono_domain_get ();
660 /* Clean our entries in the two hashes in MonoDomain */
662 mono_domain_finalizers_lock (domain);
664 /* Get the original object this handle pointed to */
665 obj = g_hash_table_lookup (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
667 g_hash_table_remove (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
669 remove_weak_track_handle_internal (domain, obj, gchandle);
672 mono_domain_finalizers_unlock (domain);
676 mono_gc_remove_weak_track_object (MonoDomain *domain, MonoObject *obj)
680 if (domain->track_resurrection_objects_hash) {
681 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
685 * Since we don't run finalizers again for resurrected objects,
686 * no need to keep these around.
688 g_hash_table_remove (domain->track_resurrection_objects_hash, obj);
695 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
697 *(void**)field_ptr = value;
701 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
703 *(void**)slot_ptr = value;
707 mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
709 mono_gc_memmove (dest_ptr, src_ptr, count * sizeof (gpointer));
713 mono_gc_wbarrier_generic_store (gpointer ptr, MonoObject* value)
715 *(void**)ptr = value;
719 mono_gc_wbarrier_generic_nostore (gpointer ptr)
724 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
726 mono_gc_memmove (dest, src, count * mono_class_value_size (klass, NULL));
730 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
732 /* do not copy the sync state */
733 mono_gc_memmove ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
734 mono_object_class (obj)->instance_size - sizeof (MonoObject));
738 mono_gc_clear_domain (MonoDomain *domain)
743 mono_gc_get_suspend_signal (void)
745 #ifdef USE_INCLUDED_GC
746 return GC_get_suspend_signal ();
752 #if defined(USE_INCLUDED_LIBGC) && defined(USE_COMPILER_TLS) && defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
753 extern __thread MONO_TLS_FAST void* GC_thread_tls;
754 #include "metadata-internals.h"
760 while (!(v & (1 << i)))
767 ATYPE_FREEPTR_FOR_BOX,
775 create_allocator (int atype, int offset)
777 int index_var, bytes_var, my_fl_var, my_entry_var;
778 guint32 no_freelist_branch, not_small_enough_branch = 0;
779 guint32 size_overflow_branch = 0;
780 MonoMethodBuilder *mb;
782 MonoMethodSignature *csig;
783 AllocatorWrapperInfo *info;
785 if (atype == ATYPE_STRING) {
786 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
787 csig->ret = &mono_defaults.string_class->byval_arg;
788 csig->params [0] = &mono_defaults.int_class->byval_arg;
789 csig->params [1] = &mono_defaults.int32_class->byval_arg;
791 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
792 csig->ret = &mono_defaults.object_class->byval_arg;
793 csig->params [0] = &mono_defaults.int_class->byval_arg;
796 mb = mono_mb_new (mono_defaults.object_class, "Alloc", MONO_WRAPPER_ALLOC);
797 bytes_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
798 if (atype == ATYPE_STRING) {
799 /* a string alloator method takes the args: (vtable, len) */
800 /* bytes = (sizeof (MonoString) + ((len + 1) * 2)); */
801 mono_mb_emit_ldarg (mb, 1);
802 mono_mb_emit_icon (mb, 1);
803 mono_mb_emit_byte (mb, MONO_CEE_ADD);
804 mono_mb_emit_icon (mb, 1);
805 mono_mb_emit_byte (mb, MONO_CEE_SHL);
806 // sizeof (MonoString) might include padding
807 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, chars));
808 mono_mb_emit_byte (mb, MONO_CEE_ADD);
809 mono_mb_emit_stloc (mb, bytes_var);
811 /* bytes = vtable->klass->instance_size */
812 mono_mb_emit_ldarg (mb, 0);
813 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoVTable, klass));
814 mono_mb_emit_byte (mb, MONO_CEE_ADD);
815 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
816 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoClass, instance_size));
817 mono_mb_emit_byte (mb, MONO_CEE_ADD);
818 /* FIXME: assert instance_size stays a 4 byte integer */
819 mono_mb_emit_byte (mb, MONO_CEE_LDIND_U4);
820 mono_mb_emit_stloc (mb, bytes_var);
823 /* this is needed for strings/arrays only as the other big types are never allocated with this method */
824 if (atype == ATYPE_STRING) {
826 /* if (!SMALL_ENOUGH (bytes)) jump slow_path;*/
827 mono_mb_emit_ldloc (mb, bytes_var);
828 mono_mb_emit_icon (mb, (NFREELISTS-1) * GRANULARITY);
829 not_small_enough_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
830 /* check for overflow */
831 mono_mb_emit_ldloc (mb, bytes_var);
832 mono_mb_emit_icon (mb, sizeof (MonoString));
833 size_overflow_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
836 /* int index = INDEX_FROM_BYTES(bytes); */
837 index_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
839 mono_mb_emit_ldloc (mb, bytes_var);
840 mono_mb_emit_icon (mb, GRANULARITY - 1);
841 mono_mb_emit_byte (mb, MONO_CEE_ADD);
842 mono_mb_emit_icon (mb, shift_amount (GRANULARITY));
843 mono_mb_emit_byte (mb, MONO_CEE_SHR_UN);
844 mono_mb_emit_icon (mb, shift_amount (sizeof (gpointer)));
845 mono_mb_emit_byte (mb, MONO_CEE_SHL);
846 /* index var is already adjusted into bytes */
847 mono_mb_emit_stloc (mb, index_var);
849 my_fl_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
850 my_entry_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
851 /* my_fl = ((GC_thread)tsd) -> ptrfree_freelists + index; */
852 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
853 mono_mb_emit_byte (mb, 0x0D); /* CEE_MONO_TLS */
854 mono_mb_emit_i4 (mb, offset);
855 if (atype == ATYPE_FREEPTR || atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING)
856 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, ptrfree_freelists));
857 else if (atype == ATYPE_NORMAL)
858 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, normal_freelists));
859 else if (atype == ATYPE_GCJ)
860 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, gcj_freelists));
862 g_assert_not_reached ();
863 mono_mb_emit_byte (mb, MONO_CEE_ADD);
864 mono_mb_emit_ldloc (mb, index_var);
865 mono_mb_emit_byte (mb, MONO_CEE_ADD);
866 mono_mb_emit_stloc (mb, my_fl_var);
868 /* my_entry = *my_fl; */
869 mono_mb_emit_ldloc (mb, my_fl_var);
870 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
871 mono_mb_emit_stloc (mb, my_entry_var);
873 /* if (EXPECT((word)my_entry >= HBLKSIZE, 1)) { */
874 mono_mb_emit_ldloc (mb, my_entry_var);
875 mono_mb_emit_icon (mb, HBLKSIZE);
876 no_freelist_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
878 /* ptr_t next = obj_link(my_entry); *my_fl = next; */
879 mono_mb_emit_ldloc (mb, my_fl_var);
880 mono_mb_emit_ldloc (mb, my_entry_var);
881 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
882 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
884 /* set the vtable and clear the words in the object */
885 mono_mb_emit_ldloc (mb, my_entry_var);
886 mono_mb_emit_ldarg (mb, 0);
887 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
889 if (atype == ATYPE_FREEPTR) {
890 int start_var, end_var, start_loop;
891 /* end = my_entry + bytes; start = my_entry + sizeof (gpointer);
893 start_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
894 end_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
895 mono_mb_emit_ldloc (mb, my_entry_var);
896 mono_mb_emit_ldloc (mb, bytes_var);
897 mono_mb_emit_byte (mb, MONO_CEE_ADD);
898 mono_mb_emit_stloc (mb, end_var);
899 mono_mb_emit_ldloc (mb, my_entry_var);
900 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
901 mono_mb_emit_byte (mb, MONO_CEE_ADD);
902 mono_mb_emit_stloc (mb, start_var);
906 * } while (start < end);
908 start_loop = mono_mb_get_label (mb);
909 mono_mb_emit_ldloc (mb, start_var);
910 mono_mb_emit_icon (mb, 0);
911 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
912 mono_mb_emit_ldloc (mb, start_var);
913 mono_mb_emit_icon (mb, sizeof (gpointer));
914 mono_mb_emit_byte (mb, MONO_CEE_ADD);
915 mono_mb_emit_stloc (mb, start_var);
917 mono_mb_emit_ldloc (mb, start_var);
918 mono_mb_emit_ldloc (mb, end_var);
919 mono_mb_emit_byte (mb, MONO_CEE_BLT_UN_S);
920 mono_mb_emit_byte (mb, start_loop - (mono_mb_get_label (mb) + 1));
921 } else if (atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING) {
922 /* need to clear just the sync pointer */
923 mono_mb_emit_ldloc (mb, my_entry_var);
924 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
925 mono_mb_emit_byte (mb, MONO_CEE_ADD);
926 mono_mb_emit_icon (mb, 0);
927 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
930 if (atype == ATYPE_STRING) {
931 /* need to set length and clear the last char */
932 /* s->length = len; */
933 mono_mb_emit_ldloc (mb, my_entry_var);
934 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, length));
935 mono_mb_emit_byte (mb, MONO_CEE_ADD);
936 mono_mb_emit_ldarg (mb, 1);
937 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
938 /* s->chars [len] = 0; */
939 mono_mb_emit_ldloc (mb, my_entry_var);
940 mono_mb_emit_ldloc (mb, bytes_var);
941 mono_mb_emit_icon (mb, 2);
942 mono_mb_emit_byte (mb, MONO_CEE_SUB);
943 mono_mb_emit_byte (mb, MONO_CEE_ADD);
944 mono_mb_emit_icon (mb, 0);
945 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
948 /* return my_entry; */
949 mono_mb_emit_ldloc (mb, my_entry_var);
950 mono_mb_emit_byte (mb, MONO_CEE_RET);
952 mono_mb_patch_short_branch (mb, no_freelist_branch);
953 if (not_small_enough_branch > 0)
954 mono_mb_patch_short_branch (mb, not_small_enough_branch);
955 if (size_overflow_branch > 0)
956 mono_mb_patch_short_branch (mb, size_overflow_branch);
957 /* the slow path: we just call back into the runtime */
958 if (atype == ATYPE_STRING) {
959 mono_mb_emit_ldarg (mb, 1);
960 mono_mb_emit_icall (mb, mono_string_alloc);
962 mono_mb_emit_ldarg (mb, 0);
963 mono_mb_emit_icall (mb, mono_object_new_specific);
966 mono_mb_emit_byte (mb, MONO_CEE_RET);
968 res = mono_mb_create_method (mb, csig, 8);
970 mono_method_get_header (res)->init_locals = FALSE;
972 info = mono_image_alloc0 (mono_defaults.corlib, sizeof (AllocatorWrapperInfo));
973 info->gc_name = "boehm";
974 info->alloc_type = atype;
975 mono_marshal_set_wrapper_info (res, info);
980 static MonoMethod* alloc_method_cache [ATYPE_NUM];
982 static G_GNUC_UNUSED gboolean
983 mono_gc_is_critical_method (MonoMethod *method)
987 for (i = 0; i < ATYPE_NUM; ++i)
988 if (method == alloc_method_cache [i])
995 * If possible, generate a managed method that can quickly allocate objects in class
996 * @klass. The method will typically have an thread-local inline allocation sequence.
997 * The signature of the called method is:
998 * object allocate (MonoVTable *vtable)
999 * Some of the logic here is similar to mono_class_get_allocation_ftn () i object.c,
1001 * The thread local alloc logic is taken from libgc/pthread_support.c.
1005 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
1009 MonoClass *klass = vtable->klass;
1010 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
1012 /*g_print ("thread tls: %d\n", offset);*/
1015 if (!SMALL_ENOUGH (klass->instance_size))
1017 if (mono_class_has_finalizer (klass) || klass->marshalbyref || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
1021 if (klass->byval_arg.type == MONO_TYPE_STRING) {
1022 atype = ATYPE_STRING;
1023 } else if (!klass->has_references) {
1025 atype = ATYPE_FREEPTR_FOR_BOX;
1027 atype = ATYPE_FREEPTR;
1031 * disabled because we currently do a runtime choice anyway, to
1032 * deal with multiple appdomains.
1033 if (vtable->gc_descr != GC_NO_DESCRIPTOR)
1036 atype = ATYPE_NORMAL;
1039 return mono_gc_get_managed_allocator_by_type (atype);
1043 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
1049 * mono_gc_get_managed_allocator_by_type:
1051 * Return a managed allocator method corresponding to allocator type ATYPE.
1054 mono_gc_get_managed_allocator_by_type (int atype)
1058 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
1060 mono_loader_lock ();
1061 res = alloc_method_cache [atype];
1063 res = alloc_method_cache [atype] = create_allocator (atype, offset);
1064 mono_loader_unlock ();
1069 mono_gc_get_managed_allocator_types (void)
1075 mono_gc_get_write_barrier (void)
1077 g_assert_not_reached ();
1083 static G_GNUC_UNUSED gboolean
1084 mono_gc_is_critical_method (MonoMethod *method)
1090 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
1096 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
1102 mono_gc_get_managed_allocator_by_type (int atype)
1108 mono_gc_get_managed_allocator_types (void)
1114 mono_gc_get_write_barrier (void)
1116 g_assert_not_reached ();
1123 mono_gc_get_gc_name (void)
1129 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
1131 return GC_call_with_alloc_lock (func, data);
1135 mono_gc_get_description (void)
1137 return g_strdup (DEFAULT_GC_NAME);
1141 mono_gc_set_desktop_mode (void)
1147 mono_gc_is_moving (void)
1153 mono_gc_is_disabled (void)
1155 if (GC_dont_gc || g_getenv ("GC_DONT_GC"))
1162 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
1164 g_assert_not_reached ();
1169 mono_gc_get_card_table (int *shift_bits, gpointer *card_mask)
1171 g_assert_not_reached ();
1176 mono_gc_get_nursery (int *shift_bits, size_t *size)
1182 mono_gc_set_current_thread_appdomain (MonoDomain *domain)
1187 mono_gc_precise_stack_mark_enabled (void)
1193 mono_gc_get_logfile (void)
1199 mono_gc_conservatively_scan_area (void *start, void *end)
1201 g_assert_not_reached ();
1205 mono_gc_scan_object (void *obj)
1207 g_assert_not_reached ();
1212 mono_gc_get_bitmap_for_descr (void *descr, int *numbits)
1214 g_assert_not_reached ();
1219 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
1224 mono_gc_set_stack_end (void *stack_end)
1228 void mono_gc_set_skip_thread (gboolean value)
1233 * These will call the redefined versions in libgc.
1239 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
1241 return pthread_create (new_thread, attr, start_routine, arg);
1245 mono_gc_pthread_join (pthread_t thread, void **retval)
1247 return pthread_join (thread, retval);
1251 mono_gc_pthread_detach (pthread_t thread)
1253 return pthread_detach (thread);
1257 mono_gc_pthread_exit (void *retval)
1259 pthread_exit (retval);
1265 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
1267 #ifdef USE_INCLUDED_LIBGC
1268 return GC_DllMain (module_handle, reason, reserved);
1276 mono_gc_get_vtable_bits (MonoClass *class)
1281 #endif /* no Boehm GC */