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 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 fprintf (stderr, "MONO_GC_PARAMS must be a comma-delimited list of one or more of the following:\n");
167 fprintf (stderr, " max-heap-size=N (where N is an integer, possibly with a k, m or a g suffix)\n");
174 memset (&cb, 0, sizeof (cb));
175 cb.thread_register = boehm_thread_register;
176 cb.mono_method_is_critical = (gpointer)mono_runtime_is_critical_method;
178 cb.mono_gc_pthread_create = (gpointer)mono_gc_pthread_create;
181 mono_threads_init (&cb, sizeof (MonoThreadInfo));
183 mono_gc_enable_events ();
184 gc_initialized = TRUE;
189 * @generation: GC generation identifier
191 * Perform a garbage collection for the given generation, higher numbers
192 * mean usually older objects. Collecting a high-numbered generation
193 * implies collecting also the lower-numbered generations.
194 * The maximum value for @generation can be retrieved with a call to
195 * mono_gc_max_generation(), so this function is usually called as:
197 * mono_gc_collect (mono_gc_max_generation ());
200 mono_gc_collect (int generation)
202 MONO_PROBE_GC_BEGIN (generation);
204 mono_perfcounters->gc_induced++;
207 MONO_PROBE_GC_END (generation);
208 #if defined(ENABLE_DTRACE) && defined(__sun__)
209 /* This works around a dtrace -G problem on Solaris.
210 Limit its actual use to when the probe is enabled. */
211 if (MONO_PROBE_GC_END_ENABLED ())
217 * mono_gc_max_generation:
219 * Get the maximum generation number used by the current garbage
220 * collector. The value will be 0 for the Boehm collector, 1 or more
221 * for the generational collectors.
223 * Returns: the maximum generation number.
226 mono_gc_max_generation (void)
232 * mono_gc_get_generation:
233 * @object: a managed object
235 * Get the garbage collector's generation that @object belongs to.
236 * Use this has a hint only.
238 * Returns: a garbage collector generation number
241 mono_gc_get_generation (MonoObject *object)
247 * mono_gc_collection_count:
248 * @generation: a GC generation number
250 * Get how many times a garbage collection has been performed
251 * for the given @generation number.
253 * Returns: the number of garbage collections
256 mono_gc_collection_count (int generation)
262 * mono_gc_add_memory_pressure:
263 * @value: amount of bytes
265 * Adjust the garbage collector's view of how many bytes of memory
266 * are indirectly referenced by managed objects (for example unmanaged
267 * memory holding image or other binary data).
268 * This is a hint only to the garbage collector algorithm.
269 * Note that negative amounts of @value will decrease the memory
273 mono_gc_add_memory_pressure (gint64 value)
278 * mono_gc_get_used_size:
280 * Get the approximate amount of memory used by managed objects.
282 * Returns: the amount of memory used in bytes
285 mono_gc_get_used_size (void)
287 return GC_get_heap_size () - GC_get_free_bytes ();
291 * mono_gc_get_heap_size:
293 * Get the amount of memory used by the garbage collector.
295 * Returns: the size of the heap in bytes
298 mono_gc_get_heap_size (void)
300 return GC_get_heap_size ();
304 mono_gc_disable (void)
306 #ifdef HAVE_GC_ENABLE
309 g_assert_not_reached ();
314 mono_gc_enable (void)
316 #ifdef HAVE_GC_ENABLE
319 g_assert_not_reached ();
324 mono_gc_is_gc_thread (void)
326 #if GC_VERSION_MAJOR >= 7
328 #elif defined(USE_INCLUDED_LIBGC)
329 return GC_thread_is_registered ();
335 extern int GC_thread_register_foreign (void *base_addr);
338 mono_gc_register_thread (void *baseptr)
340 return mono_thread_info_attach (baseptr) != NULL;
344 boehm_thread_register (MonoThreadInfo* info, void *baseptr)
346 #if GC_VERSION_MAJOR >= 7
347 struct GC_stack_base sb;
350 res = GC_get_stack_base (&sb);
351 if (res != GC_SUCCESS) {
352 sb.mem_base = baseptr;
354 /* Can't determine the register stack bounds */
355 g_error ("mono_gc_register_thread failed ().\n");
358 res = GC_register_my_thread (&sb);
359 if ((res != GC_SUCCESS) && (res != GC_DUPLICATE)) {
360 g_warning ("GC_register_my_thread () failed.\n");
365 if (mono_gc_is_gc_thread())
367 #if defined(USE_INCLUDED_LIBGC) && !defined(HOST_WIN32)
368 return GC_thread_register_foreign (baseptr) ? info : NULL;
376 mono_object_is_alive (MonoObject* o)
378 #ifdef USE_INCLUDED_LIBGC
379 return GC_is_marked ((gpointer)o);
386 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
391 #ifdef USE_INCLUDED_LIBGC
393 static gint64 gc_start_time;
396 on_gc_notification (GCEventType event)
398 MonoGCEvent e = (MonoGCEvent)event;
400 if (e == MONO_GC_EVENT_PRE_STOP_WORLD)
401 mono_thread_info_suspend_lock ();
402 else if (e == MONO_GC_EVENT_POST_START_WORLD)
403 mono_thread_info_suspend_unlock ();
405 if (e == MONO_GC_EVENT_START) {
406 if (mono_perfcounters)
407 mono_perfcounters->gc_collections0++;
408 mono_stats.major_gc_count ++;
409 gc_start_time = mono_100ns_ticks ();
410 } else if (e == MONO_GC_EVENT_END) {
411 if (mono_perfcounters) {
412 guint64 heap_size = GC_get_heap_size ();
413 guint64 used_size = heap_size - GC_get_free_bytes ();
414 mono_perfcounters->gc_total_bytes = used_size;
415 mono_perfcounters->gc_committed_bytes = heap_size;
416 mono_perfcounters->gc_reserved_bytes = heap_size;
417 mono_perfcounters->gc_gen0size = heap_size;
419 mono_stats.major_gc_time_usecs += (mono_100ns_ticks () - gc_start_time) / 10;
420 mono_trace_message (MONO_TRACE_GC, "gc took %d usecs", (mono_100ns_ticks () - gc_start_time) / 10);
422 mono_profiler_gc_event (e, 0);
426 on_gc_heap_resize (size_t new_size)
428 guint64 heap_size = GC_get_heap_size ();
429 if (mono_perfcounters) {
430 mono_perfcounters->gc_committed_bytes = heap_size;
431 mono_perfcounters->gc_reserved_bytes = heap_size;
432 mono_perfcounters->gc_gen0size = heap_size;
434 mono_profiler_gc_heap_resize (new_size);
438 mono_gc_enable_events (void)
440 GC_notify_event = on_gc_notification;
441 GC_on_heap_resize = on_gc_heap_resize;
447 mono_gc_enable_events (void)
454 mono_gc_register_root (char *start, size_t size, void *descr)
456 /* for some strange reason, they want one extra byte on the end */
457 GC_add_roots (start, start + size + 1);
463 mono_gc_deregister_root (char* addr)
466 /* FIXME: libgc doesn't define this work win32 for some reason */
467 /* FIXME: No size info */
468 GC_remove_roots (addr, addr + sizeof (gpointer) + 1);
473 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
475 /* libgc requires that we use HIDE_POINTER... */
476 *link_addr = (void*)HIDE_POINTER (obj);
477 GC_GENERAL_REGISTER_DISAPPEARING_LINK (link_addr, obj);
481 mono_gc_weak_link_remove (void **link_addr)
483 GC_unregister_disappearing_link (link_addr);
488 reveal_link (gpointer link_addr)
490 void **link_a = link_addr;
491 return REVEAL_POINTER (*link_a);
495 mono_gc_weak_link_get (void **link_addr)
497 MonoObject *obj = GC_call_with_alloc_lock (reveal_link, link_addr);
498 if (obj == (MonoObject *) -1)
504 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
506 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
510 mono_gc_make_descr_for_object (gsize *bitmap, int numbits, size_t obj_size)
512 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
516 mono_gc_make_descr_for_array (int vector, gsize *elem_bitmap, int numbits, size_t elem_size)
518 /* libgc has no usable support for arrays... */
519 return GC_NO_DESCRIPTOR;
523 mono_gc_make_descr_from_bitmap (gsize *bitmap, int numbits)
525 #ifdef HAVE_GC_GCJ_MALLOC
526 /* It seems there are issues when the bitmap doesn't fit: play it safe */
528 return GC_NO_DESCRIPTOR;
530 return (gpointer)GC_make_descriptor ((GC_bitmap)bitmap, numbits);
537 mono_gc_make_root_descr_all_refs (int numbits)
543 mono_gc_alloc_fixed (size_t size, void *descr)
545 /* To help track down typed allocation bugs */
549 if (count == atoi (getenv ("COUNT2")))
551 if (count > atoi (getenv ("COUNT2")))
552 return GC_MALLOC (size);
556 return GC_MALLOC_EXPLICITLY_TYPED (size, (GC_descr)descr);
558 return GC_MALLOC (size);
562 mono_gc_free_fixed (void* addr)
567 mono_gc_invoke_finalizers (void)
569 /* There is a bug in GC_invoke_finalizer () in versions <= 6.2alpha4:
570 * the 'mem_freed' variable is not initialized when there are no
571 * objects to finalize, which leads to strange behavior later on.
572 * The check is necessary to work around that bug.
574 if (GC_should_invoke_finalizers ())
575 return GC_invoke_finalizers ();
580 mono_gc_pending_finalizers (void)
582 return GC_should_invoke_finalizers ();
586 * LOCKING: Assumes the domain_finalizers lock is held.
589 add_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
593 if (!domain->track_resurrection_objects_hash)
594 domain->track_resurrection_objects_hash = g_hash_table_new (mono_aligned_addr_hash, NULL);
596 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
597 refs = g_slist_prepend (refs, GUINT_TO_POINTER (gchandle));
598 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
602 mono_gc_add_weak_track_handle (MonoObject *obj, guint32 handle)
609 domain = mono_object_get_domain (obj);
611 mono_domain_finalizers_lock (domain);
613 add_weak_track_handle_internal (domain, obj, handle);
615 g_hash_table_insert (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (handle), obj);
617 mono_domain_finalizers_unlock (domain);
621 * LOCKING: Assumes the domain_finalizers lock is held.
624 remove_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
628 if (!domain->track_resurrection_objects_hash)
631 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
632 refs = g_slist_remove (refs, GUINT_TO_POINTER (gchandle));
633 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
637 mono_gc_change_weak_track_handle (MonoObject *old_obj, MonoObject *obj, guint32 gchandle)
639 MonoDomain *domain = mono_domain_get ();
641 mono_domain_finalizers_lock (domain);
644 remove_weak_track_handle_internal (domain, old_obj, gchandle);
646 add_weak_track_handle_internal (domain, obj, gchandle);
648 mono_domain_finalizers_unlock (domain);
652 mono_gc_remove_weak_track_handle (guint32 gchandle)
654 MonoDomain *domain = mono_domain_get ();
657 /* Clean our entries in the two hashes in MonoDomain */
659 mono_domain_finalizers_lock (domain);
661 /* Get the original object this handle pointed to */
662 obj = g_hash_table_lookup (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
664 g_hash_table_remove (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
666 remove_weak_track_handle_internal (domain, obj, gchandle);
669 mono_domain_finalizers_unlock (domain);
673 mono_gc_remove_weak_track_object (MonoDomain *domain, MonoObject *obj)
677 if (domain->track_resurrection_objects_hash) {
678 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
682 * Since we don't run finalizers again for resurrected objects,
683 * no need to keep these around.
685 g_hash_table_remove (domain->track_resurrection_objects_hash, obj);
692 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
694 *(void**)field_ptr = value;
698 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
700 *(void**)slot_ptr = value;
704 mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
706 mono_gc_memmove (dest_ptr, src_ptr, count * sizeof (gpointer));
710 mono_gc_wbarrier_generic_store (gpointer ptr, MonoObject* value)
712 *(void**)ptr = value;
716 mono_gc_wbarrier_generic_nostore (gpointer ptr)
721 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
723 mono_gc_memmove (dest, src, count * mono_class_value_size (klass, NULL));
727 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
729 /* do not copy the sync state */
730 mono_gc_memmove ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
731 mono_object_class (obj)->instance_size - sizeof (MonoObject));
735 mono_gc_clear_domain (MonoDomain *domain)
740 mono_gc_get_suspend_signal (void)
742 #ifdef USE_INCLUDED_GC
743 return GC_get_suspend_signal ();
749 #if defined(USE_INCLUDED_LIBGC) && defined(USE_COMPILER_TLS) && defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
750 extern __thread MONO_TLS_FAST void* GC_thread_tls;
751 #include "metadata-internals.h"
757 while (!(v & (1 << i)))
764 ATYPE_FREEPTR_FOR_BOX,
772 create_allocator (int atype, int offset)
774 int index_var, bytes_var, my_fl_var, my_entry_var;
775 guint32 no_freelist_branch, not_small_enough_branch = 0;
776 guint32 size_overflow_branch = 0;
777 MonoMethodBuilder *mb;
779 MonoMethodSignature *csig;
780 AllocatorWrapperInfo *info;
782 if (atype == ATYPE_STRING) {
783 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
784 csig->ret = &mono_defaults.string_class->byval_arg;
785 csig->params [0] = &mono_defaults.int_class->byval_arg;
786 csig->params [1] = &mono_defaults.int32_class->byval_arg;
788 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
789 csig->ret = &mono_defaults.object_class->byval_arg;
790 csig->params [0] = &mono_defaults.int_class->byval_arg;
793 mb = mono_mb_new (mono_defaults.object_class, "Alloc", MONO_WRAPPER_ALLOC);
794 bytes_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
795 if (atype == ATYPE_STRING) {
796 /* a string alloator method takes the args: (vtable, len) */
797 /* bytes = (sizeof (MonoString) + ((len + 1) * 2)); */
798 mono_mb_emit_ldarg (mb, 1);
799 mono_mb_emit_icon (mb, 1);
800 mono_mb_emit_byte (mb, MONO_CEE_ADD);
801 mono_mb_emit_icon (mb, 1);
802 mono_mb_emit_byte (mb, MONO_CEE_SHL);
803 // sizeof (MonoString) might include padding
804 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, chars));
805 mono_mb_emit_byte (mb, MONO_CEE_ADD);
806 mono_mb_emit_stloc (mb, bytes_var);
808 /* bytes = vtable->klass->instance_size */
809 mono_mb_emit_ldarg (mb, 0);
810 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoVTable, klass));
811 mono_mb_emit_byte (mb, MONO_CEE_ADD);
812 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
813 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoClass, instance_size));
814 mono_mb_emit_byte (mb, MONO_CEE_ADD);
815 /* FIXME: assert instance_size stays a 4 byte integer */
816 mono_mb_emit_byte (mb, MONO_CEE_LDIND_U4);
817 mono_mb_emit_stloc (mb, bytes_var);
820 /* this is needed for strings/arrays only as the other big types are never allocated with this method */
821 if (atype == ATYPE_STRING) {
823 /* if (!SMALL_ENOUGH (bytes)) jump slow_path;*/
824 mono_mb_emit_ldloc (mb, bytes_var);
825 mono_mb_emit_icon (mb, (NFREELISTS-1) * GRANULARITY);
826 not_small_enough_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
827 /* check for overflow */
828 mono_mb_emit_ldloc (mb, bytes_var);
829 mono_mb_emit_icon (mb, sizeof (MonoString));
830 size_overflow_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
833 /* int index = INDEX_FROM_BYTES(bytes); */
834 index_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
836 mono_mb_emit_ldloc (mb, bytes_var);
837 mono_mb_emit_icon (mb, GRANULARITY - 1);
838 mono_mb_emit_byte (mb, MONO_CEE_ADD);
839 mono_mb_emit_icon (mb, shift_amount (GRANULARITY));
840 mono_mb_emit_byte (mb, MONO_CEE_SHR_UN);
841 mono_mb_emit_icon (mb, shift_amount (sizeof (gpointer)));
842 mono_mb_emit_byte (mb, MONO_CEE_SHL);
843 /* index var is already adjusted into bytes */
844 mono_mb_emit_stloc (mb, index_var);
846 my_fl_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
847 my_entry_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
848 /* my_fl = ((GC_thread)tsd) -> ptrfree_freelists + index; */
849 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
850 mono_mb_emit_byte (mb, 0x0D); /* CEE_MONO_TLS */
851 mono_mb_emit_i4 (mb, offset);
852 if (atype == ATYPE_FREEPTR || atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING)
853 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, ptrfree_freelists));
854 else if (atype == ATYPE_NORMAL)
855 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, normal_freelists));
856 else if (atype == ATYPE_GCJ)
857 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, gcj_freelists));
859 g_assert_not_reached ();
860 mono_mb_emit_byte (mb, MONO_CEE_ADD);
861 mono_mb_emit_ldloc (mb, index_var);
862 mono_mb_emit_byte (mb, MONO_CEE_ADD);
863 mono_mb_emit_stloc (mb, my_fl_var);
865 /* my_entry = *my_fl; */
866 mono_mb_emit_ldloc (mb, my_fl_var);
867 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
868 mono_mb_emit_stloc (mb, my_entry_var);
870 /* if (EXPECT((word)my_entry >= HBLKSIZE, 1)) { */
871 mono_mb_emit_ldloc (mb, my_entry_var);
872 mono_mb_emit_icon (mb, HBLKSIZE);
873 no_freelist_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
875 /* ptr_t next = obj_link(my_entry); *my_fl = next; */
876 mono_mb_emit_ldloc (mb, my_fl_var);
877 mono_mb_emit_ldloc (mb, my_entry_var);
878 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
879 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
881 /* set the vtable and clear the words in the object */
882 mono_mb_emit_ldloc (mb, my_entry_var);
883 mono_mb_emit_ldarg (mb, 0);
884 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
886 if (atype == ATYPE_FREEPTR) {
887 int start_var, end_var, start_loop;
888 /* end = my_entry + bytes; start = my_entry + sizeof (gpointer);
890 start_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
891 end_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
892 mono_mb_emit_ldloc (mb, my_entry_var);
893 mono_mb_emit_ldloc (mb, bytes_var);
894 mono_mb_emit_byte (mb, MONO_CEE_ADD);
895 mono_mb_emit_stloc (mb, end_var);
896 mono_mb_emit_ldloc (mb, my_entry_var);
897 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
898 mono_mb_emit_byte (mb, MONO_CEE_ADD);
899 mono_mb_emit_stloc (mb, start_var);
903 * } while (start < end);
905 start_loop = mono_mb_get_label (mb);
906 mono_mb_emit_ldloc (mb, start_var);
907 mono_mb_emit_icon (mb, 0);
908 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
909 mono_mb_emit_ldloc (mb, start_var);
910 mono_mb_emit_icon (mb, sizeof (gpointer));
911 mono_mb_emit_byte (mb, MONO_CEE_ADD);
912 mono_mb_emit_stloc (mb, start_var);
914 mono_mb_emit_ldloc (mb, start_var);
915 mono_mb_emit_ldloc (mb, end_var);
916 mono_mb_emit_byte (mb, MONO_CEE_BLT_UN_S);
917 mono_mb_emit_byte (mb, start_loop - (mono_mb_get_label (mb) + 1));
918 } else if (atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING) {
919 /* need to clear just the sync pointer */
920 mono_mb_emit_ldloc (mb, my_entry_var);
921 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
922 mono_mb_emit_byte (mb, MONO_CEE_ADD);
923 mono_mb_emit_icon (mb, 0);
924 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
927 if (atype == ATYPE_STRING) {
928 /* need to set length and clear the last char */
929 /* s->length = len; */
930 mono_mb_emit_ldloc (mb, my_entry_var);
931 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, length));
932 mono_mb_emit_byte (mb, MONO_CEE_ADD);
933 mono_mb_emit_ldarg (mb, 1);
934 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
935 /* s->chars [len] = 0; */
936 mono_mb_emit_ldloc (mb, my_entry_var);
937 mono_mb_emit_ldloc (mb, bytes_var);
938 mono_mb_emit_icon (mb, 2);
939 mono_mb_emit_byte (mb, MONO_CEE_SUB);
940 mono_mb_emit_byte (mb, MONO_CEE_ADD);
941 mono_mb_emit_icon (mb, 0);
942 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
945 /* return my_entry; */
946 mono_mb_emit_ldloc (mb, my_entry_var);
947 mono_mb_emit_byte (mb, MONO_CEE_RET);
949 mono_mb_patch_short_branch (mb, no_freelist_branch);
950 if (not_small_enough_branch > 0)
951 mono_mb_patch_short_branch (mb, not_small_enough_branch);
952 if (size_overflow_branch > 0)
953 mono_mb_patch_short_branch (mb, size_overflow_branch);
954 /* the slow path: we just call back into the runtime */
955 if (atype == ATYPE_STRING) {
956 mono_mb_emit_ldarg (mb, 1);
957 mono_mb_emit_icall (mb, mono_string_alloc);
959 mono_mb_emit_ldarg (mb, 0);
960 mono_mb_emit_icall (mb, mono_object_new_specific);
963 mono_mb_emit_byte (mb, MONO_CEE_RET);
965 res = mono_mb_create_method (mb, csig, 8);
967 mono_method_get_header (res)->init_locals = FALSE;
969 info = mono_image_alloc0 (mono_defaults.corlib, sizeof (AllocatorWrapperInfo));
970 info->gc_name = "boehm";
971 info->alloc_type = atype;
972 mono_marshal_set_wrapper_info (res, info);
977 static MonoMethod* alloc_method_cache [ATYPE_NUM];
979 static G_GNUC_UNUSED gboolean
980 mono_gc_is_critical_method (MonoMethod *method)
984 for (i = 0; i < ATYPE_NUM; ++i)
985 if (method == alloc_method_cache [i])
992 * If possible, generate a managed method that can quickly allocate objects in class
993 * @klass. The method will typically have an thread-local inline allocation sequence.
994 * The signature of the called method is:
995 * object allocate (MonoVTable *vtable)
996 * Some of the logic here is similar to mono_class_get_allocation_ftn () i object.c,
998 * The thread local alloc logic is taken from libgc/pthread_support.c.
1002 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
1006 MonoClass *klass = vtable->klass;
1007 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
1009 /*g_print ("thread tls: %d\n", offset);*/
1012 if (!SMALL_ENOUGH (klass->instance_size))
1014 if (mono_class_has_finalizer (klass) || klass->marshalbyref || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
1018 if (klass->byval_arg.type == MONO_TYPE_STRING) {
1019 atype = ATYPE_STRING;
1020 } else if (!klass->has_references) {
1022 atype = ATYPE_FREEPTR_FOR_BOX;
1024 atype = ATYPE_FREEPTR;
1028 * disabled because we currently do a runtime choice anyway, to
1029 * deal with multiple appdomains.
1030 if (vtable->gc_descr != GC_NO_DESCRIPTOR)
1033 atype = ATYPE_NORMAL;
1036 return mono_gc_get_managed_allocator_by_type (atype);
1040 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
1046 * mono_gc_get_managed_allocator_by_type:
1048 * Return a managed allocator method corresponding to allocator type ATYPE.
1051 mono_gc_get_managed_allocator_by_type (int atype)
1055 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
1057 mono_loader_lock ();
1058 res = alloc_method_cache [atype];
1060 res = alloc_method_cache [atype] = create_allocator (atype, offset);
1061 mono_loader_unlock ();
1066 mono_gc_get_managed_allocator_types (void)
1072 mono_gc_get_write_barrier (void)
1074 g_assert_not_reached ();
1080 static G_GNUC_UNUSED gboolean
1081 mono_gc_is_critical_method (MonoMethod *method)
1087 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
1093 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
1099 mono_gc_get_managed_allocator_by_type (int atype)
1105 mono_gc_get_managed_allocator_types (void)
1111 mono_gc_get_write_barrier (void)
1113 g_assert_not_reached ();
1120 mono_gc_get_gc_name (void)
1126 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
1128 return GC_call_with_alloc_lock (func, data);
1132 mono_gc_get_description (void)
1134 return g_strdup (DEFAULT_GC_NAME);
1138 mono_gc_set_desktop_mode (void)
1144 mono_gc_is_moving (void)
1150 mono_gc_is_disabled (void)
1152 if (GC_dont_gc || g_getenv ("GC_DONT_GC"))
1159 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
1161 g_assert_not_reached ();
1166 mono_gc_get_card_table (int *shift_bits, gpointer *card_mask)
1168 g_assert_not_reached ();
1173 mono_gc_get_nursery (int *shift_bits, size_t *size)
1179 mono_gc_precise_stack_mark_enabled (void)
1185 mono_gc_get_logfile (void)
1191 mono_gc_conservatively_scan_area (void *start, void *end)
1193 g_assert_not_reached ();
1197 mono_gc_scan_object (void *obj)
1199 g_assert_not_reached ();
1204 mono_gc_get_bitmap_for_descr (void *descr, int *numbits)
1206 g_assert_not_reached ();
1211 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
1216 * These will call the redefined versions in libgc.
1222 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
1224 return pthread_create (new_thread, attr, start_routine, arg);
1228 mono_gc_pthread_join (pthread_t thread, void **retval)
1230 return pthread_join (thread, retval);
1234 mono_gc_pthread_detach (pthread_t thread)
1236 return pthread_detach (thread);
1240 mono_gc_pthread_exit (void *retval)
1242 pthread_exit (retval);
1248 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
1250 #ifdef USE_INCLUDED_LIBGC
1251 return GC_DllMain (module_handle, reason, reserved);
1258 #endif /* no Boehm GC */