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 #if defined(PLATFORM_MACOSX) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
41 void *pthread_get_stackaddr_np(pthread_t);
44 #define GC_NO_DESCRIPTOR ((gpointer)(0 | GC_DS_LENGTH))
45 /*Boehm max heap cannot be smaller than 16MB*/
46 #define MIN_BOEHM_MAX_HEAP_SIZE_IN_MB 16
47 #define MIN_BOEHM_MAX_HEAP_SIZE (MIN_BOEHM_MAX_HEAP_SIZE_IN_MB << 20)
49 static gboolean gc_initialized = FALSE;
52 boehm_thread_register (MonoThreadInfo* info, void *baseptr);
55 mono_gc_warning (char *msg, GC_word arg)
57 mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_GC, msg, (unsigned long)arg);
61 mono_gc_base_init (void)
63 MonoThreadInfoCallbacks cb;
70 * Handle the case when we are called from a thread different from the main thread,
72 * FIXME: Move this to libgc where it belongs.
74 * we used to do this only when running on valgrind,
75 * but it happens also in other setups.
77 #if defined(HAVE_PTHREAD_GETATTR_NP) && defined(HAVE_PTHREAD_ATTR_GETSTACK)
82 pthread_getattr_np (pthread_self (), &attr);
83 pthread_attr_getstack (&attr, &sstart, &size);
84 pthread_attr_destroy (&attr);
85 /*g_print ("stackbottom pth is: %p\n", (char*)sstart + size);*/
88 * The calculation above doesn't seem to work on ia64, also we need to set
89 * GC_register_stackbottom as well, but don't know how.
92 /* apparently with some linuxthreads implementations sstart can be NULL,
93 * fallback to the more imprecise method (bug# 78096).
96 GC_stackbottom = (char*)sstart + size;
99 gsize stack_bottom = (gsize)&dummy;
100 stack_bottom += 4095;
101 stack_bottom &= ~4095;
102 GC_stackbottom = (char*)stack_bottom;
106 #elif defined(HAVE_PTHREAD_GET_STACKSIZE_NP) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
107 GC_stackbottom = (char*)pthread_get_stackaddr_np (pthread_self ());
108 #elif defined(__OpenBSD__)
109 # include <pthread_np.h>
114 rslt = pthread_stackseg_np(pthread_self(), &ss);
115 g_assert (rslt == 0);
117 GC_stackbottom = (char*)ss.ss_sp;
119 #elif defined(__native_client__)
120 /* Do nothing, GC_stackbottom is set correctly in libgc */
124 gsize stack_bottom = (gsize)&dummy;
125 stack_bottom += 4095;
126 stack_bottom &= ~4095;
127 /*g_print ("stackbottom is: %p\n", (char*)stack_bottom);*/
128 GC_stackbottom = (char*)stack_bottom;
132 #if !defined(PLATFORM_ANDROID)
133 /* If GC_no_dls is set to true, GC_find_limit is not called. This causes a seg fault on Android. */
137 GC_oom_fn = mono_gc_out_of_memory;
138 GC_set_warn_proc (mono_gc_warning);
139 GC_finalize_on_demand = 1;
140 GC_finalizer_notifier = mono_gc_finalize_notify;
142 #ifdef HAVE_GC_GCJ_MALLOC
143 GC_init_gcj_malloc (5, NULL);
146 #ifdef HAVE_GC_ALLOW_REGISTER_THREADS
147 GC_allow_register_threads();
150 if ((env = getenv ("MONO_GC_PARAMS"))) {
151 char **ptr, **opts = g_strsplit (env, ",", -1);
152 for (ptr = opts; *ptr; ++ptr) {
154 if (g_str_has_prefix (opt, "max-heap-size=")) {
157 opt = strchr (opt, '=') + 1;
158 if (*opt && mono_gc_parse_environment_string_extract_number (opt, &max_heap)) {
159 if (max_heap < MIN_BOEHM_MAX_HEAP_SIZE) {
160 fprintf (stderr, "max-heap-size must be at least %dMb.\n", MIN_BOEHM_MAX_HEAP_SIZE_IN_MB);
163 GC_set_max_heap_size (max_heap);
165 fprintf (stderr, "max-heap-size must be an integer.\n");
170 /* Could be a parameter for sgen */
172 fprintf (stderr, "MONO_GC_PARAMS must be a comma-delimited list of one or more of the following:\n");
173 fprintf (stderr, " max-heap-size=N (where N is an integer, possibly with a k, m or a g suffix)\n");
181 memset (&cb, 0, sizeof (cb));
182 cb.thread_register = boehm_thread_register;
183 cb.mono_method_is_critical = (gpointer)mono_runtime_is_critical_method;
185 cb.mono_gc_pthread_create = (gpointer)mono_gc_pthread_create;
188 mono_threads_init (&cb, sizeof (MonoThreadInfo));
190 mono_gc_enable_events ();
191 gc_initialized = TRUE;
196 * @generation: GC generation identifier
198 * Perform a garbage collection for the given generation, higher numbers
199 * mean usually older objects. Collecting a high-numbered generation
200 * implies collecting also the lower-numbered generations.
201 * The maximum value for @generation can be retrieved with a call to
202 * mono_gc_max_generation(), so this function is usually called as:
204 * mono_gc_collect (mono_gc_max_generation ());
207 mono_gc_collect (int generation)
209 MONO_GC_BEGIN (generation);
211 #ifndef DISABLE_PERFCOUNTERS
212 mono_perfcounters->gc_induced++;
216 MONO_GC_END (generation);
217 #if defined(ENABLE_DTRACE) && defined(__sun__)
218 /* This works around a dtrace -G problem on Solaris.
219 Limit its actual use to when the probe is enabled. */
220 if (MONO_GC_END_ENABLED ())
226 * mono_gc_max_generation:
228 * Get the maximum generation number used by the current garbage
229 * collector. The value will be 0 for the Boehm collector, 1 or more
230 * for the generational collectors.
232 * Returns: the maximum generation number.
235 mono_gc_max_generation (void)
241 * mono_gc_get_generation:
242 * @object: a managed object
244 * Get the garbage collector's generation that @object belongs to.
245 * Use this has a hint only.
247 * Returns: a garbage collector generation number
250 mono_gc_get_generation (MonoObject *object)
256 * mono_gc_collection_count:
257 * @generation: a GC generation number
259 * Get how many times a garbage collection has been performed
260 * for the given @generation number.
262 * Returns: the number of garbage collections
265 mono_gc_collection_count (int generation)
271 * mono_gc_add_memory_pressure:
272 * @value: amount of bytes
274 * Adjust the garbage collector's view of how many bytes of memory
275 * are indirectly referenced by managed objects (for example unmanaged
276 * memory holding image or other binary data).
277 * This is a hint only to the garbage collector algorithm.
278 * Note that negative amounts of @value will decrease the memory
282 mono_gc_add_memory_pressure (gint64 value)
287 * mono_gc_get_used_size:
289 * Get the approximate amount of memory used by managed objects.
291 * Returns: the amount of memory used in bytes
294 mono_gc_get_used_size (void)
296 return GC_get_heap_size () - GC_get_free_bytes ();
300 * mono_gc_get_heap_size:
302 * Get the amount of memory used by the garbage collector.
304 * Returns: the size of the heap in bytes
307 mono_gc_get_heap_size (void)
309 return GC_get_heap_size ();
313 mono_gc_disable (void)
315 #ifdef HAVE_GC_ENABLE
318 g_assert_not_reached ();
323 mono_gc_enable (void)
325 #ifdef HAVE_GC_ENABLE
328 g_assert_not_reached ();
333 mono_gc_is_gc_thread (void)
335 #if GC_VERSION_MAJOR >= 7
337 #elif defined(USE_INCLUDED_LIBGC)
338 return GC_thread_is_registered ();
344 extern int GC_thread_register_foreign (void *base_addr);
347 mono_gc_register_thread (void *baseptr)
349 return mono_thread_info_attach (baseptr) != NULL;
353 boehm_thread_register (MonoThreadInfo* info, void *baseptr)
355 #if GC_VERSION_MAJOR >= 7
356 struct GC_stack_base sb;
359 res = GC_get_stack_base (&sb);
360 if (res != GC_SUCCESS) {
361 sb.mem_base = baseptr;
363 /* Can't determine the register stack bounds */
364 g_error ("mono_gc_register_thread failed ().\n");
367 res = GC_register_my_thread (&sb);
368 if ((res != GC_SUCCESS) && (res != GC_DUPLICATE)) {
369 g_warning ("GC_register_my_thread () failed.\n");
374 if (mono_gc_is_gc_thread())
376 #if defined(USE_INCLUDED_LIBGC) && !defined(HOST_WIN32)
377 return GC_thread_register_foreign (baseptr) ? info : NULL;
385 mono_object_is_alive (MonoObject* o)
387 #ifdef USE_INCLUDED_LIBGC
388 return GC_is_marked ((gpointer)o);
395 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
400 #ifdef USE_INCLUDED_LIBGC
402 static gint64 gc_start_time;
405 on_gc_notification (GCEventType event)
407 MonoGCEvent e = (MonoGCEvent)event;
409 if (e == MONO_GC_EVENT_PRE_STOP_WORLD)
410 mono_thread_info_suspend_lock ();
411 else if (e == MONO_GC_EVENT_POST_START_WORLD)
412 mono_thread_info_suspend_unlock ();
414 if (e == MONO_GC_EVENT_START) {
415 #ifndef DISABLE_PERFCOUNTERS
416 if (mono_perfcounters)
417 mono_perfcounters->gc_collections0++;
419 gc_stats.major_gc_count ++;
420 gc_start_time = mono_100ns_ticks ();
421 } else if (e == MONO_GC_EVENT_END) {
422 #ifndef DISABLE_PERFCOUNTERS
423 if (mono_perfcounters) {
424 guint64 heap_size = GC_get_heap_size ();
425 guint64 used_size = heap_size - GC_get_free_bytes ();
426 mono_perfcounters->gc_total_bytes = used_size;
427 mono_perfcounters->gc_committed_bytes = heap_size;
428 mono_perfcounters->gc_reserved_bytes = heap_size;
429 mono_perfcounters->gc_gen0size = heap_size;
432 gc_stats.major_gc_time_usecs += (mono_100ns_ticks () - gc_start_time) / 10;
433 mono_trace_message (MONO_TRACE_GC, "gc took %d usecs", (mono_100ns_ticks () - gc_start_time) / 10);
435 mono_profiler_gc_event (e, 0);
439 on_gc_heap_resize (size_t new_size)
441 guint64 heap_size = GC_get_heap_size ();
442 #ifndef DISABLE_PERFCOUNTERS
443 if (mono_perfcounters) {
444 mono_perfcounters->gc_committed_bytes = heap_size;
445 mono_perfcounters->gc_reserved_bytes = heap_size;
446 mono_perfcounters->gc_gen0size = heap_size;
449 mono_profiler_gc_heap_resize (new_size);
453 mono_gc_enable_events (void)
455 GC_notify_event = on_gc_notification;
456 GC_on_heap_resize = on_gc_heap_resize;
462 mono_gc_enable_events (void)
469 mono_gc_register_root (char *start, size_t size, void *descr)
471 /* for some strange reason, they want one extra byte on the end */
472 GC_add_roots (start, start + size + 1);
478 mono_gc_deregister_root (char* addr)
481 /* FIXME: libgc doesn't define this work win32 for some reason */
482 /* FIXME: No size info */
483 GC_remove_roots (addr, addr + sizeof (gpointer) + 1);
488 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
490 /* libgc requires that we use HIDE_POINTER... */
491 *link_addr = (void*)HIDE_POINTER (obj);
492 GC_GENERAL_REGISTER_DISAPPEARING_LINK (link_addr, obj);
496 mono_gc_weak_link_remove (void **link_addr)
498 GC_unregister_disappearing_link (link_addr);
503 reveal_link (gpointer link_addr)
505 void **link_a = link_addr;
506 return REVEAL_POINTER (*link_a);
510 mono_gc_weak_link_get (void **link_addr)
512 MonoObject *obj = GC_call_with_alloc_lock (reveal_link, link_addr);
513 if (obj == (MonoObject *) -1)
519 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
521 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
525 mono_gc_make_descr_for_object (gsize *bitmap, int numbits, size_t obj_size)
527 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
531 mono_gc_make_descr_for_array (int vector, gsize *elem_bitmap, int numbits, size_t elem_size)
533 /* libgc has no usable support for arrays... */
534 return GC_NO_DESCRIPTOR;
538 mono_gc_make_descr_from_bitmap (gsize *bitmap, int numbits)
540 #ifdef HAVE_GC_GCJ_MALLOC
541 /* It seems there are issues when the bitmap doesn't fit: play it safe */
543 return GC_NO_DESCRIPTOR;
545 return (gpointer)GC_make_descriptor ((GC_bitmap)bitmap, numbits);
552 mono_gc_make_root_descr_all_refs (int numbits)
558 mono_gc_alloc_fixed (size_t size, void *descr)
560 /* To help track down typed allocation bugs */
564 if (count == atoi (getenv ("COUNT2")))
566 if (count > atoi (getenv ("COUNT2")))
567 return GC_MALLOC (size);
571 return GC_MALLOC_EXPLICITLY_TYPED (size, (GC_descr)descr);
573 return GC_MALLOC (size);
577 mono_gc_free_fixed (void* addr)
582 mono_gc_invoke_finalizers (void)
584 /* There is a bug in GC_invoke_finalizer () in versions <= 6.2alpha4:
585 * the 'mem_freed' variable is not initialized when there are no
586 * objects to finalize, which leads to strange behavior later on.
587 * The check is necessary to work around that bug.
589 if (GC_should_invoke_finalizers ())
590 return GC_invoke_finalizers ();
595 mono_gc_pending_finalizers (void)
597 return GC_should_invoke_finalizers ();
601 * LOCKING: Assumes the domain_finalizers lock is held.
604 add_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
608 if (!domain->track_resurrection_objects_hash)
609 domain->track_resurrection_objects_hash = g_hash_table_new (mono_aligned_addr_hash, NULL);
611 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
612 refs = g_slist_prepend (refs, GUINT_TO_POINTER (gchandle));
613 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
617 mono_gc_add_weak_track_handle (MonoObject *obj, guint32 handle)
624 domain = mono_object_get_domain (obj);
626 mono_domain_finalizers_lock (domain);
628 add_weak_track_handle_internal (domain, obj, handle);
630 g_hash_table_insert (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (handle), obj);
632 mono_domain_finalizers_unlock (domain);
636 * LOCKING: Assumes the domain_finalizers lock is held.
639 remove_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
643 if (!domain->track_resurrection_objects_hash)
646 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
647 refs = g_slist_remove (refs, GUINT_TO_POINTER (gchandle));
648 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
652 mono_gc_change_weak_track_handle (MonoObject *old_obj, MonoObject *obj, guint32 gchandle)
654 MonoDomain *domain = mono_domain_get ();
656 mono_domain_finalizers_lock (domain);
659 remove_weak_track_handle_internal (domain, old_obj, gchandle);
661 add_weak_track_handle_internal (domain, obj, gchandle);
663 mono_domain_finalizers_unlock (domain);
667 mono_gc_remove_weak_track_handle (guint32 gchandle)
669 MonoDomain *domain = mono_domain_get ();
672 /* Clean our entries in the two hashes in MonoDomain */
674 mono_domain_finalizers_lock (domain);
676 /* Get the original object this handle pointed to */
677 obj = g_hash_table_lookup (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
679 g_hash_table_remove (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
681 remove_weak_track_handle_internal (domain, obj, gchandle);
684 mono_domain_finalizers_unlock (domain);
688 mono_gc_remove_weak_track_object (MonoDomain *domain, MonoObject *obj)
692 if (domain->track_resurrection_objects_hash) {
693 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
697 * Since we don't run finalizers again for resurrected objects,
698 * no need to keep these around.
700 g_hash_table_remove (domain->track_resurrection_objects_hash, obj);
707 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
709 *(void**)field_ptr = value;
713 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
715 *(void**)slot_ptr = value;
719 mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
721 mono_gc_memmove (dest_ptr, src_ptr, count * sizeof (gpointer));
725 mono_gc_wbarrier_generic_store (gpointer ptr, MonoObject* value)
727 *(void**)ptr = value;
731 mono_gc_wbarrier_generic_nostore (gpointer ptr)
736 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
738 mono_gc_memmove (dest, src, count * mono_class_value_size (klass, NULL));
742 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
744 /* do not copy the sync state */
745 mono_gc_memmove ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
746 mono_object_class (obj)->instance_size - sizeof (MonoObject));
750 mono_gc_clear_domain (MonoDomain *domain)
755 mono_gc_get_suspend_signal (void)
757 #ifdef USE_INCLUDED_GC
758 return GC_get_suspend_signal ();
764 #if defined(USE_INCLUDED_LIBGC) && defined(USE_COMPILER_TLS) && defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
765 extern __thread MONO_TLS_FAST void* GC_thread_tls;
766 #include "metadata-internals.h"
772 while (!(v & (1 << i)))
779 ATYPE_FREEPTR_FOR_BOX,
787 create_allocator (int atype, int offset)
789 int index_var, bytes_var, my_fl_var, my_entry_var;
790 guint32 no_freelist_branch, not_small_enough_branch = 0;
791 guint32 size_overflow_branch = 0;
792 MonoMethodBuilder *mb;
794 MonoMethodSignature *csig;
795 AllocatorWrapperInfo *info;
797 if (atype == ATYPE_STRING) {
798 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
799 csig->ret = &mono_defaults.string_class->byval_arg;
800 csig->params [0] = &mono_defaults.int_class->byval_arg;
801 csig->params [1] = &mono_defaults.int32_class->byval_arg;
803 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
804 csig->ret = &mono_defaults.object_class->byval_arg;
805 csig->params [0] = &mono_defaults.int_class->byval_arg;
808 mb = mono_mb_new (mono_defaults.object_class, "Alloc", MONO_WRAPPER_ALLOC);
809 bytes_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
810 if (atype == ATYPE_STRING) {
811 /* a string alloator method takes the args: (vtable, len) */
812 /* bytes = (sizeof (MonoString) + ((len + 1) * 2)); */
813 mono_mb_emit_ldarg (mb, 1);
814 mono_mb_emit_icon (mb, 1);
815 mono_mb_emit_byte (mb, MONO_CEE_ADD);
816 mono_mb_emit_icon (mb, 1);
817 mono_mb_emit_byte (mb, MONO_CEE_SHL);
818 // sizeof (MonoString) might include padding
819 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, chars));
820 mono_mb_emit_byte (mb, MONO_CEE_ADD);
821 mono_mb_emit_stloc (mb, bytes_var);
823 /* bytes = vtable->klass->instance_size */
824 mono_mb_emit_ldarg (mb, 0);
825 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoVTable, klass));
826 mono_mb_emit_byte (mb, MONO_CEE_ADD);
827 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
828 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoClass, instance_size));
829 mono_mb_emit_byte (mb, MONO_CEE_ADD);
830 /* FIXME: assert instance_size stays a 4 byte integer */
831 mono_mb_emit_byte (mb, MONO_CEE_LDIND_U4);
832 mono_mb_emit_stloc (mb, bytes_var);
835 /* this is needed for strings/arrays only as the other big types are never allocated with this method */
836 if (atype == ATYPE_STRING) {
838 /* if (!SMALL_ENOUGH (bytes)) jump slow_path;*/
839 mono_mb_emit_ldloc (mb, bytes_var);
840 mono_mb_emit_icon (mb, (NFREELISTS-1) * GRANULARITY);
841 not_small_enough_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
842 /* check for overflow */
843 mono_mb_emit_ldloc (mb, bytes_var);
844 mono_mb_emit_icon (mb, sizeof (MonoString));
845 size_overflow_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
848 /* int index = INDEX_FROM_BYTES(bytes); */
849 index_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
851 mono_mb_emit_ldloc (mb, bytes_var);
852 mono_mb_emit_icon (mb, GRANULARITY - 1);
853 mono_mb_emit_byte (mb, MONO_CEE_ADD);
854 mono_mb_emit_icon (mb, shift_amount (GRANULARITY));
855 mono_mb_emit_byte (mb, MONO_CEE_SHR_UN);
856 mono_mb_emit_icon (mb, shift_amount (sizeof (gpointer)));
857 mono_mb_emit_byte (mb, MONO_CEE_SHL);
858 /* index var is already adjusted into bytes */
859 mono_mb_emit_stloc (mb, index_var);
861 my_fl_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
862 my_entry_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
863 /* my_fl = ((GC_thread)tsd) -> ptrfree_freelists + index; */
864 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
865 mono_mb_emit_byte (mb, 0x0D); /* CEE_MONO_TLS */
866 mono_mb_emit_i4 (mb, offset);
867 if (atype == ATYPE_FREEPTR || atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING)
868 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, ptrfree_freelists));
869 else if (atype == ATYPE_NORMAL)
870 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, normal_freelists));
871 else if (atype == ATYPE_GCJ)
872 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, gcj_freelists));
874 g_assert_not_reached ();
875 mono_mb_emit_byte (mb, MONO_CEE_ADD);
876 mono_mb_emit_ldloc (mb, index_var);
877 mono_mb_emit_byte (mb, MONO_CEE_ADD);
878 mono_mb_emit_stloc (mb, my_fl_var);
880 /* my_entry = *my_fl; */
881 mono_mb_emit_ldloc (mb, my_fl_var);
882 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
883 mono_mb_emit_stloc (mb, my_entry_var);
885 /* if (EXPECT((word)my_entry >= HBLKSIZE, 1)) { */
886 mono_mb_emit_ldloc (mb, my_entry_var);
887 mono_mb_emit_icon (mb, HBLKSIZE);
888 no_freelist_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
890 /* ptr_t next = obj_link(my_entry); *my_fl = next; */
891 mono_mb_emit_ldloc (mb, my_fl_var);
892 mono_mb_emit_ldloc (mb, my_entry_var);
893 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
894 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
896 /* set the vtable and clear the words in the object */
897 mono_mb_emit_ldloc (mb, my_entry_var);
898 mono_mb_emit_ldarg (mb, 0);
899 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
901 if (atype == ATYPE_FREEPTR) {
902 int start_var, end_var, start_loop;
903 /* end = my_entry + bytes; start = my_entry + sizeof (gpointer);
905 start_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
906 end_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
907 mono_mb_emit_ldloc (mb, my_entry_var);
908 mono_mb_emit_ldloc (mb, bytes_var);
909 mono_mb_emit_byte (mb, MONO_CEE_ADD);
910 mono_mb_emit_stloc (mb, end_var);
911 mono_mb_emit_ldloc (mb, my_entry_var);
912 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
913 mono_mb_emit_byte (mb, MONO_CEE_ADD);
914 mono_mb_emit_stloc (mb, start_var);
918 * } while (start < end);
920 start_loop = mono_mb_get_label (mb);
921 mono_mb_emit_ldloc (mb, start_var);
922 mono_mb_emit_icon (mb, 0);
923 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
924 mono_mb_emit_ldloc (mb, start_var);
925 mono_mb_emit_icon (mb, sizeof (gpointer));
926 mono_mb_emit_byte (mb, MONO_CEE_ADD);
927 mono_mb_emit_stloc (mb, start_var);
929 mono_mb_emit_ldloc (mb, start_var);
930 mono_mb_emit_ldloc (mb, end_var);
931 mono_mb_emit_byte (mb, MONO_CEE_BLT_UN_S);
932 mono_mb_emit_byte (mb, start_loop - (mono_mb_get_label (mb) + 1));
933 } else if (atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING) {
934 /* need to clear just the sync pointer */
935 mono_mb_emit_ldloc (mb, my_entry_var);
936 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
937 mono_mb_emit_byte (mb, MONO_CEE_ADD);
938 mono_mb_emit_icon (mb, 0);
939 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
942 if (atype == ATYPE_STRING) {
943 /* need to set length and clear the last char */
944 /* s->length = len; */
945 mono_mb_emit_ldloc (mb, my_entry_var);
946 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, length));
947 mono_mb_emit_byte (mb, MONO_CEE_ADD);
948 mono_mb_emit_ldarg (mb, 1);
949 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
950 /* s->chars [len] = 0; */
951 mono_mb_emit_ldloc (mb, my_entry_var);
952 mono_mb_emit_ldloc (mb, bytes_var);
953 mono_mb_emit_icon (mb, 2);
954 mono_mb_emit_byte (mb, MONO_CEE_SUB);
955 mono_mb_emit_byte (mb, MONO_CEE_ADD);
956 mono_mb_emit_icon (mb, 0);
957 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
960 /* return my_entry; */
961 mono_mb_emit_ldloc (mb, my_entry_var);
962 mono_mb_emit_byte (mb, MONO_CEE_RET);
964 mono_mb_patch_short_branch (mb, no_freelist_branch);
965 if (not_small_enough_branch > 0)
966 mono_mb_patch_short_branch (mb, not_small_enough_branch);
967 if (size_overflow_branch > 0)
968 mono_mb_patch_short_branch (mb, size_overflow_branch);
969 /* the slow path: we just call back into the runtime */
970 if (atype == ATYPE_STRING) {
971 mono_mb_emit_ldarg (mb, 1);
972 mono_mb_emit_icall (mb, mono_string_alloc);
974 mono_mb_emit_ldarg (mb, 0);
975 mono_mb_emit_icall (mb, mono_object_new_specific);
978 mono_mb_emit_byte (mb, MONO_CEE_RET);
980 res = mono_mb_create_method (mb, csig, 8);
982 mono_method_get_header (res)->init_locals = FALSE;
984 info = mono_image_alloc0 (mono_defaults.corlib, sizeof (AllocatorWrapperInfo));
985 info->gc_name = "boehm";
986 info->alloc_type = atype;
987 mono_marshal_set_wrapper_info (res, info);
992 static MonoMethod* alloc_method_cache [ATYPE_NUM];
994 static G_GNUC_UNUSED gboolean
995 mono_gc_is_critical_method (MonoMethod *method)
999 for (i = 0; i < ATYPE_NUM; ++i)
1000 if (method == alloc_method_cache [i])
1007 * If possible, generate a managed method that can quickly allocate objects in class
1008 * @klass. The method will typically have an thread-local inline allocation sequence.
1009 * The signature of the called method is:
1010 * object allocate (MonoVTable *vtable)
1011 * Some of the logic here is similar to mono_class_get_allocation_ftn () i object.c,
1013 * The thread local alloc logic is taken from libgc/pthread_support.c.
1017 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
1021 MonoClass *klass = vtable->klass;
1022 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
1024 /*g_print ("thread tls: %d\n", offset);*/
1027 if (!SMALL_ENOUGH (klass->instance_size))
1029 if (mono_class_has_finalizer (klass) || klass->marshalbyref || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
1033 if (klass->byval_arg.type == MONO_TYPE_STRING) {
1034 atype = ATYPE_STRING;
1035 } else if (!klass->has_references) {
1037 atype = ATYPE_FREEPTR_FOR_BOX;
1039 atype = ATYPE_FREEPTR;
1043 * disabled because we currently do a runtime choice anyway, to
1044 * deal with multiple appdomains.
1045 if (vtable->gc_descr != GC_NO_DESCRIPTOR)
1048 atype = ATYPE_NORMAL;
1051 return mono_gc_get_managed_allocator_by_type (atype);
1055 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
1061 * mono_gc_get_managed_allocator_by_type:
1063 * Return a managed allocator method corresponding to allocator type ATYPE.
1066 mono_gc_get_managed_allocator_by_type (int atype)
1070 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
1072 mono_loader_lock ();
1073 res = alloc_method_cache [atype];
1075 res = alloc_method_cache [atype] = create_allocator (atype, offset);
1076 mono_loader_unlock ();
1081 mono_gc_get_managed_allocator_types (void)
1087 mono_gc_get_write_barrier (void)
1089 g_assert_not_reached ();
1095 static G_GNUC_UNUSED gboolean
1096 mono_gc_is_critical_method (MonoMethod *method)
1102 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
1108 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
1114 mono_gc_get_managed_allocator_by_type (int atype)
1120 mono_gc_get_managed_allocator_types (void)
1126 mono_gc_get_write_barrier (void)
1128 g_assert_not_reached ();
1135 mono_gc_get_gc_name (void)
1141 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
1143 return GC_call_with_alloc_lock (func, data);
1147 mono_gc_get_description (void)
1149 return g_strdup (DEFAULT_GC_NAME);
1153 mono_gc_set_desktop_mode (void)
1159 mono_gc_is_moving (void)
1165 mono_gc_is_disabled (void)
1167 if (GC_dont_gc || g_getenv ("GC_DONT_GC"))
1174 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
1176 g_assert_not_reached ();
1181 mono_gc_get_card_table (int *shift_bits, gpointer *card_mask)
1183 g_assert_not_reached ();
1188 mono_gc_get_nursery (int *shift_bits, size_t *size)
1194 mono_gc_set_current_thread_appdomain (MonoDomain *domain)
1199 mono_gc_precise_stack_mark_enabled (void)
1205 mono_gc_get_logfile (void)
1211 mono_gc_conservatively_scan_area (void *start, void *end)
1213 g_assert_not_reached ();
1217 mono_gc_scan_object (void *obj)
1219 g_assert_not_reached ();
1224 mono_gc_get_bitmap_for_descr (void *descr, int *numbits)
1226 g_assert_not_reached ();
1231 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
1236 mono_gc_set_stack_end (void *stack_end)
1240 void mono_gc_set_skip_thread (gboolean value)
1245 * These will call the redefined versions in libgc.
1251 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
1253 return pthread_create (new_thread, attr, start_routine, arg);
1257 mono_gc_pthread_join (pthread_t thread, void **retval)
1259 return pthread_join (thread, retval);
1263 mono_gc_pthread_detach (pthread_t thread)
1265 return pthread_detach (thread);
1269 mono_gc_pthread_exit (void *retval)
1271 pthread_exit (retval);
1277 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
1279 #ifdef USE_INCLUDED_LIBGC
1280 return GC_DllMain (module_handle, reason, reserved);
1288 mono_gc_get_vtable_bits (MonoClass *class)
1294 * mono_gc_register_altstack:
1296 * Register the dimensions of the normal stack and altstack with the collector.
1297 * Currently, STACK/STACK_SIZE is only used when the thread is suspended while it is on an altstack.
1300 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
1302 #ifdef USE_INCLUDED_LIBGC
1303 GC_register_altstack (stack, stack_size, altstack, altstack_size);
1308 mono_gc_get_los_limit (void)
1314 mono_gc_user_markers_supported (void)
1320 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
1322 g_assert_not_reached ();
1326 #endif /* no Boehm GC */