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/metadata/runtime.h>
24 #include <mono/utils/mono-logger-internal.h>
25 #include <mono/utils/mono-time.h>
26 #include <mono/utils/mono-threads.h>
27 #include <mono/utils/dtrace.h>
28 #include <mono/utils/gc_wrapper.h>
32 #ifdef USE_INCLUDED_LIBGC
35 #define THREAD_LOCAL_ALLOC 1
36 #include "private/pthread_support.h"
39 #define GC_NO_DESCRIPTOR ((gpointer)(0 | GC_DS_LENGTH))
40 /*Boehm max heap cannot be smaller than 16MB*/
41 #define MIN_BOEHM_MAX_HEAP_SIZE_IN_MB 16
42 #define MIN_BOEHM_MAX_HEAP_SIZE (MIN_BOEHM_MAX_HEAP_SIZE_IN_MB << 20)
44 static gboolean gc_initialized = FALSE;
47 boehm_thread_register (MonoThreadInfo* info, void *baseptr);
50 mono_gc_warning (char *msg, GC_word arg)
52 mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_GC, msg, (unsigned long)arg);
56 mono_gc_base_init (void)
58 MonoThreadInfoCallbacks cb;
65 * Handle the case when we are called from a thread different from the main thread,
67 * FIXME: Move this to libgc where it belongs.
69 * we used to do this only when running on valgrind,
70 * but it happens also in other setups.
72 #if defined(HAVE_PTHREAD_GETATTR_NP) && defined(HAVE_PTHREAD_ATTR_GETSTACK)
77 pthread_getattr_np (pthread_self (), &attr);
78 pthread_attr_getstack (&attr, &sstart, &size);
79 pthread_attr_destroy (&attr);
80 /*g_print ("stackbottom pth is: %p\n", (char*)sstart + size);*/
83 * The calculation above doesn't seem to work on ia64, also we need to set
84 * GC_register_stackbottom as well, but don't know how.
87 /* apparently with some linuxthreads implementations sstart can be NULL,
88 * fallback to the more imprecise method (bug# 78096).
91 GC_stackbottom = (char*)sstart + size;
94 gsize stack_bottom = (gsize)&dummy;
96 stack_bottom &= ~4095;
97 GC_stackbottom = (char*)stack_bottom;
101 #elif defined(HAVE_PTHREAD_GET_STACKSIZE_NP) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
102 GC_stackbottom = (char*)pthread_get_stackaddr_np (pthread_self ());
103 #elif defined(__OpenBSD__)
104 # include <pthread_np.h>
109 rslt = pthread_stackseg_np(pthread_self(), &ss);
110 g_assert (rslt == 0);
112 GC_stackbottom = (char*)ss.ss_sp;
114 #elif defined(__native_client__)
115 /* Do nothing, GC_stackbottom is set correctly in libgc */
119 gsize stack_bottom = (gsize)&dummy;
120 stack_bottom += 4095;
121 stack_bottom &= ~4095;
122 /*g_print ("stackbottom is: %p\n", (char*)stack_bottom);*/
123 GC_stackbottom = (char*)stack_bottom;
127 #if !defined(PLATFORM_ANDROID)
128 /* If GC_no_dls is set to true, GC_find_limit is not called. This causes a seg fault on Android. */
132 GC_oom_fn = mono_gc_out_of_memory;
133 GC_set_warn_proc (mono_gc_warning);
134 GC_finalize_on_demand = 1;
135 GC_finalizer_notifier = mono_gc_finalize_notify;
137 #ifdef HAVE_GC_GCJ_MALLOC
138 GC_init_gcj_malloc (5, NULL);
141 #ifdef HAVE_GC_ALLOW_REGISTER_THREADS
142 GC_allow_register_threads();
145 if ((env = getenv ("MONO_GC_PARAMS"))) {
146 char **ptr, **opts = g_strsplit (env, ",", -1);
147 for (ptr = opts; *ptr; ++ptr) {
149 if (g_str_has_prefix (opt, "max-heap-size=")) {
152 opt = strchr (opt, '=') + 1;
153 if (*opt && mono_gc_parse_environment_string_extract_number (opt, &max_heap)) {
154 if (max_heap < MIN_BOEHM_MAX_HEAP_SIZE) {
155 fprintf (stderr, "max-heap-size must be at least %dMb.\n", MIN_BOEHM_MAX_HEAP_SIZE_IN_MB);
158 GC_set_max_heap_size (max_heap);
160 fprintf (stderr, "max-heap-size must be an integer.\n");
165 fprintf (stderr, "MONO_GC_PARAMS must be a comma-delimited list of one or more of the following:\n");
166 fprintf (stderr, " max-heap-size=N (where N is an integer, possibly with a k, m or a g suffix)\n");
173 memset (&cb, 0, sizeof (cb));
174 cb.thread_register = boehm_thread_register;
175 cb.mono_method_is_critical = (gpointer)mono_runtime_is_critical_method;
176 cb.mono_gc_pthread_create = (gpointer)mono_gc_pthread_create;
178 mono_threads_init (&cb, sizeof (MonoThreadInfo));
180 mono_gc_enable_events ();
181 gc_initialized = TRUE;
186 * @generation: GC generation identifier
188 * Perform a garbage collection for the given generation, higher numbers
189 * mean usually older objects. Collecting a high-numbered generation
190 * implies collecting also the lower-numbered generations.
191 * The maximum value for @generation can be retrieved with a call to
192 * mono_gc_max_generation(), so this function is usually called as:
194 * mono_gc_collect (mono_gc_max_generation ());
197 mono_gc_collect (int generation)
199 MONO_PROBE_GC_BEGIN (generation);
201 mono_perfcounters->gc_induced++;
204 MONO_PROBE_GC_END (generation);
205 #if defined(ENABLE_DTRACE) && defined(__sun__)
206 /* This works around a dtrace -G problem on Solaris.
207 Limit its actual use to when the probe is enabled. */
208 if (MONO_PROBE_GC_END_ENABLED ())
214 * mono_gc_max_generation:
216 * Get the maximum generation number used by the current garbage
217 * collector. The value will be 0 for the Boehm collector, 1 or more
218 * for the generational collectors.
220 * Returns: the maximum generation number.
223 mono_gc_max_generation (void)
229 * mono_gc_get_generation:
230 * @object: a managed object
232 * Get the garbage collector's generation that @object belongs to.
233 * Use this has a hint only.
235 * Returns: a garbage collector generation number
238 mono_gc_get_generation (MonoObject *object)
244 * mono_gc_collection_count:
245 * @generation: a GC generation number
247 * Get how many times a garbage collection has been performed
248 * for the given @generation number.
250 * Returns: the number of garbage collections
253 mono_gc_collection_count (int generation)
259 * mono_gc_add_memory_pressure:
260 * @value: amount of bytes
262 * Adjust the garbage collector's view of how many bytes of memory
263 * are indirectly referenced by managed objects (for example unmanaged
264 * memory holding image or other binary data).
265 * This is a hint only to the garbage collector algorithm.
266 * Note that negative amounts of @value will decrease the memory
270 mono_gc_add_memory_pressure (gint64 value)
275 * mono_gc_get_used_size:
277 * Get the approximate amount of memory used by managed objects.
279 * Returns: the amount of memory used in bytes
282 mono_gc_get_used_size (void)
284 return GC_get_heap_size () - GC_get_free_bytes ();
288 * mono_gc_get_heap_size:
290 * Get the amount of memory used by the garbage collector.
292 * Returns: the size of the heap in bytes
295 mono_gc_get_heap_size (void)
297 return GC_get_heap_size ();
301 mono_gc_disable (void)
303 #ifdef HAVE_GC_ENABLE
306 g_assert_not_reached ();
311 mono_gc_enable (void)
313 #ifdef HAVE_GC_ENABLE
316 g_assert_not_reached ();
321 mono_gc_is_gc_thread (void)
323 #if GC_VERSION_MAJOR >= 7
325 #elif defined(USE_INCLUDED_LIBGC)
326 return GC_thread_is_registered ();
332 extern int GC_thread_register_foreign (void *base_addr);
335 mono_gc_register_thread (void *baseptr)
337 return mono_thread_info_attach (baseptr) != NULL;
341 boehm_thread_register (MonoThreadInfo* info, void *baseptr)
343 #if GC_VERSION_MAJOR >= 7
344 struct GC_stack_base sb;
347 res = GC_get_stack_base (&sb);
348 if (res != GC_SUCCESS) {
349 sb.mem_base = baseptr;
351 /* Can't determine the register stack bounds */
352 g_error ("mono_gc_register_thread failed ().\n");
355 res = GC_register_my_thread (&sb);
356 if ((res != GC_SUCCESS) && (res != GC_DUPLICATE)) {
357 g_warning ("GC_register_my_thread () failed.\n");
362 if (mono_gc_is_gc_thread())
364 #if defined(USE_INCLUDED_LIBGC) && !defined(HOST_WIN32)
365 return GC_thread_register_foreign (baseptr) ? info : NULL;
373 mono_object_is_alive (MonoObject* o)
375 #ifdef USE_INCLUDED_LIBGC
376 return GC_is_marked ((gpointer)o);
383 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
388 #ifdef USE_INCLUDED_LIBGC
390 static gint64 gc_start_time;
393 on_gc_notification (GCEventType event)
395 MonoGCEvent e = (MonoGCEvent)event;
397 if (e == MONO_GC_EVENT_PRE_STOP_WORLD)
398 mono_thread_info_suspend_lock ();
399 else if (e == MONO_GC_EVENT_POST_START_WORLD)
400 mono_thread_info_suspend_unlock ();
402 if (e == MONO_GC_EVENT_START) {
403 if (mono_perfcounters)
404 mono_perfcounters->gc_collections0++;
405 mono_stats.major_gc_count ++;
406 gc_start_time = mono_100ns_ticks ();
407 } else if (e == MONO_GC_EVENT_END) {
408 if (mono_perfcounters) {
409 guint64 heap_size = GC_get_heap_size ();
410 guint64 used_size = heap_size - GC_get_free_bytes ();
411 mono_perfcounters->gc_total_bytes = used_size;
412 mono_perfcounters->gc_committed_bytes = heap_size;
413 mono_perfcounters->gc_reserved_bytes = heap_size;
414 mono_perfcounters->gc_gen0size = heap_size;
416 mono_stats.major_gc_time_usecs += (mono_100ns_ticks () - gc_start_time) / 10;
417 mono_trace_message (MONO_TRACE_GC, "gc took %d usecs", (mono_100ns_ticks () - gc_start_time) / 10);
419 mono_profiler_gc_event (e, 0);
423 on_gc_heap_resize (size_t new_size)
425 guint64 heap_size = GC_get_heap_size ();
426 if (mono_perfcounters) {
427 mono_perfcounters->gc_committed_bytes = heap_size;
428 mono_perfcounters->gc_reserved_bytes = heap_size;
429 mono_perfcounters->gc_gen0size = heap_size;
431 mono_profiler_gc_heap_resize (new_size);
435 mono_gc_enable_events (void)
437 GC_notify_event = on_gc_notification;
438 GC_on_heap_resize = on_gc_heap_resize;
444 mono_gc_enable_events (void)
451 mono_gc_register_root (char *start, size_t size, void *descr)
453 /* for some strange reason, they want one extra byte on the end */
454 GC_add_roots (start, start + size + 1);
460 mono_gc_deregister_root (char* addr)
463 /* FIXME: libgc doesn't define this work win32 for some reason */
464 /* FIXME: No size info */
465 GC_remove_roots (addr, addr + sizeof (gpointer) + 1);
470 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
472 /* libgc requires that we use HIDE_POINTER... */
473 *link_addr = (void*)HIDE_POINTER (obj);
474 GC_GENERAL_REGISTER_DISAPPEARING_LINK (link_addr, obj);
478 mono_gc_weak_link_remove (void **link_addr)
480 GC_unregister_disappearing_link (link_addr);
485 reveal_link (gpointer link_addr)
487 void **link_a = link_addr;
488 return REVEAL_POINTER (*link_a);
492 mono_gc_weak_link_get (void **link_addr)
494 MonoObject *obj = GC_call_with_alloc_lock (reveal_link, link_addr);
495 if (obj == (MonoObject *) -1)
501 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
503 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
507 mono_gc_make_descr_for_object (gsize *bitmap, int numbits, size_t obj_size)
509 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
513 mono_gc_make_descr_for_array (int vector, gsize *elem_bitmap, int numbits, size_t elem_size)
515 /* libgc has no usable support for arrays... */
516 return GC_NO_DESCRIPTOR;
520 mono_gc_make_descr_from_bitmap (gsize *bitmap, int numbits)
522 #ifdef HAVE_GC_GCJ_MALLOC
523 /* It seems there are issues when the bitmap doesn't fit: play it safe */
525 return GC_NO_DESCRIPTOR;
527 return (gpointer)GC_make_descriptor ((GC_bitmap)bitmap, numbits);
534 mono_gc_make_root_descr_all_refs (int numbits)
540 mono_gc_alloc_fixed (size_t size, void *descr)
542 /* To help track down typed allocation bugs */
546 if (count == atoi (getenv ("COUNT2")))
548 if (count > atoi (getenv ("COUNT2")))
549 return GC_MALLOC (size);
553 return GC_MALLOC_EXPLICITLY_TYPED (size, (GC_descr)descr);
555 return GC_MALLOC (size);
559 mono_gc_free_fixed (void* addr)
564 mono_gc_invoke_finalizers (void)
566 /* There is a bug in GC_invoke_finalizer () in versions <= 6.2alpha4:
567 * the 'mem_freed' variable is not initialized when there are no
568 * objects to finalize, which leads to strange behavior later on.
569 * The check is necessary to work around that bug.
571 if (GC_should_invoke_finalizers ())
572 return GC_invoke_finalizers ();
577 mono_gc_pending_finalizers (void)
579 return GC_should_invoke_finalizers ();
583 * LOCKING: Assumes the domain_finalizers lock is held.
586 add_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
590 if (!domain->track_resurrection_objects_hash)
591 domain->track_resurrection_objects_hash = g_hash_table_new (mono_aligned_addr_hash, NULL);
593 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
594 refs = g_slist_prepend (refs, GUINT_TO_POINTER (gchandle));
595 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
599 mono_gc_add_weak_track_handle (MonoObject *obj, guint32 handle)
606 domain = mono_object_get_domain (obj);
608 mono_domain_finalizers_lock (domain);
610 add_weak_track_handle_internal (domain, obj, handle);
612 g_hash_table_insert (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (handle), obj);
614 mono_domain_finalizers_unlock (domain);
618 * LOCKING: Assumes the domain_finalizers lock is held.
621 remove_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
625 if (!domain->track_resurrection_objects_hash)
628 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
629 refs = g_slist_remove (refs, GUINT_TO_POINTER (gchandle));
630 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
634 mono_gc_change_weak_track_handle (MonoObject *old_obj, MonoObject *obj, guint32 gchandle)
636 MonoDomain *domain = mono_domain_get ();
638 mono_domain_finalizers_lock (domain);
641 remove_weak_track_handle_internal (domain, old_obj, gchandle);
643 add_weak_track_handle_internal (domain, obj, gchandle);
645 mono_domain_finalizers_unlock (domain);
649 mono_gc_remove_weak_track_handle (guint32 gchandle)
651 MonoDomain *domain = mono_domain_get ();
654 /* Clean our entries in the two hashes in MonoDomain */
656 mono_domain_finalizers_lock (domain);
658 /* Get the original object this handle pointed to */
659 obj = g_hash_table_lookup (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
661 g_hash_table_remove (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
663 remove_weak_track_handle_internal (domain, obj, gchandle);
666 mono_domain_finalizers_unlock (domain);
670 mono_gc_remove_weak_track_object (MonoDomain *domain, MonoObject *obj)
674 if (domain->track_resurrection_objects_hash) {
675 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
679 * Since we don't run finalizers again for resurrected objects,
680 * no need to keep these around.
682 g_hash_table_remove (domain->track_resurrection_objects_hash, obj);
689 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
691 *(void**)field_ptr = value;
695 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
697 *(void**)slot_ptr = value;
701 mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
703 mono_gc_memmove (dest_ptr, src_ptr, count * sizeof (gpointer));
707 mono_gc_wbarrier_generic_store (gpointer ptr, MonoObject* value)
709 *(void**)ptr = value;
713 mono_gc_wbarrier_generic_nostore (gpointer ptr)
718 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
720 mono_gc_memmove (dest, src, count * mono_class_value_size (klass, NULL));
724 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
726 /* do not copy the sync state */
727 mono_gc_memmove ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
728 mono_object_class (obj)->instance_size - sizeof (MonoObject));
732 mono_gc_clear_domain (MonoDomain *domain)
737 mono_gc_get_suspend_signal (void)
739 #ifdef USE_INCLUDED_GC
740 return GC_get_suspend_signal ();
746 #if defined(USE_INCLUDED_LIBGC) && defined(USE_COMPILER_TLS) && defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
747 extern __thread MONO_TLS_FAST void* GC_thread_tls;
748 #include "metadata-internals.h"
754 while (!(v & (1 << i)))
761 ATYPE_FREEPTR_FOR_BOX,
769 create_allocator (int atype, int offset)
771 int index_var, bytes_var, my_fl_var, my_entry_var;
772 guint32 no_freelist_branch, not_small_enough_branch = 0;
773 guint32 size_overflow_branch = 0;
774 MonoMethodBuilder *mb;
776 MonoMethodSignature *csig;
777 AllocatorWrapperInfo *info;
779 if (atype == ATYPE_STRING) {
780 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
781 csig->ret = &mono_defaults.string_class->byval_arg;
782 csig->params [0] = &mono_defaults.int_class->byval_arg;
783 csig->params [1] = &mono_defaults.int32_class->byval_arg;
785 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
786 csig->ret = &mono_defaults.object_class->byval_arg;
787 csig->params [0] = &mono_defaults.int_class->byval_arg;
790 mb = mono_mb_new (mono_defaults.object_class, "Alloc", MONO_WRAPPER_ALLOC);
791 bytes_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
792 if (atype == ATYPE_STRING) {
793 /* a string alloator method takes the args: (vtable, len) */
794 /* bytes = (sizeof (MonoString) + ((len + 1) * 2)); */
795 mono_mb_emit_ldarg (mb, 1);
796 mono_mb_emit_icon (mb, 1);
797 mono_mb_emit_byte (mb, MONO_CEE_ADD);
798 mono_mb_emit_icon (mb, 1);
799 mono_mb_emit_byte (mb, MONO_CEE_SHL);
800 // sizeof (MonoString) might include padding
801 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, chars));
802 mono_mb_emit_byte (mb, MONO_CEE_ADD);
803 mono_mb_emit_stloc (mb, bytes_var);
805 /* bytes = vtable->klass->instance_size */
806 mono_mb_emit_ldarg (mb, 0);
807 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoVTable, klass));
808 mono_mb_emit_byte (mb, MONO_CEE_ADD);
809 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
810 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoClass, instance_size));
811 mono_mb_emit_byte (mb, MONO_CEE_ADD);
812 /* FIXME: assert instance_size stays a 4 byte integer */
813 mono_mb_emit_byte (mb, MONO_CEE_LDIND_U4);
814 mono_mb_emit_stloc (mb, bytes_var);
817 /* this is needed for strings/arrays only as the other big types are never allocated with this method */
818 if (atype == ATYPE_STRING) {
820 /* if (!SMALL_ENOUGH (bytes)) jump slow_path;*/
821 mono_mb_emit_ldloc (mb, bytes_var);
822 mono_mb_emit_icon (mb, (NFREELISTS-1) * GRANULARITY);
823 not_small_enough_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
824 /* check for overflow */
825 mono_mb_emit_ldloc (mb, bytes_var);
826 mono_mb_emit_icon (mb, sizeof (MonoString));
827 size_overflow_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
830 /* int index = INDEX_FROM_BYTES(bytes); */
831 index_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
833 mono_mb_emit_ldloc (mb, bytes_var);
834 mono_mb_emit_icon (mb, GRANULARITY - 1);
835 mono_mb_emit_byte (mb, MONO_CEE_ADD);
836 mono_mb_emit_icon (mb, shift_amount (GRANULARITY));
837 mono_mb_emit_byte (mb, MONO_CEE_SHR_UN);
838 mono_mb_emit_icon (mb, shift_amount (sizeof (gpointer)));
839 mono_mb_emit_byte (mb, MONO_CEE_SHL);
840 /* index var is already adjusted into bytes */
841 mono_mb_emit_stloc (mb, index_var);
843 my_fl_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
844 my_entry_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
845 /* my_fl = ((GC_thread)tsd) -> ptrfree_freelists + index; */
846 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
847 mono_mb_emit_byte (mb, 0x0D); /* CEE_MONO_TLS */
848 mono_mb_emit_i4 (mb, offset);
849 if (atype == ATYPE_FREEPTR || atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING)
850 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, ptrfree_freelists));
851 else if (atype == ATYPE_NORMAL)
852 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, normal_freelists));
853 else if (atype == ATYPE_GCJ)
854 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, gcj_freelists));
856 g_assert_not_reached ();
857 mono_mb_emit_byte (mb, MONO_CEE_ADD);
858 mono_mb_emit_ldloc (mb, index_var);
859 mono_mb_emit_byte (mb, MONO_CEE_ADD);
860 mono_mb_emit_stloc (mb, my_fl_var);
862 /* my_entry = *my_fl; */
863 mono_mb_emit_ldloc (mb, my_fl_var);
864 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
865 mono_mb_emit_stloc (mb, my_entry_var);
867 /* if (EXPECT((word)my_entry >= HBLKSIZE, 1)) { */
868 mono_mb_emit_ldloc (mb, my_entry_var);
869 mono_mb_emit_icon (mb, HBLKSIZE);
870 no_freelist_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
872 /* ptr_t next = obj_link(my_entry); *my_fl = next; */
873 mono_mb_emit_ldloc (mb, my_fl_var);
874 mono_mb_emit_ldloc (mb, my_entry_var);
875 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
876 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
878 /* set the vtable and clear the words in the object */
879 mono_mb_emit_ldloc (mb, my_entry_var);
880 mono_mb_emit_ldarg (mb, 0);
881 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
883 if (atype == ATYPE_FREEPTR) {
884 int start_var, end_var, start_loop;
885 /* end = my_entry + bytes; start = my_entry + sizeof (gpointer);
887 start_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
888 end_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
889 mono_mb_emit_ldloc (mb, my_entry_var);
890 mono_mb_emit_ldloc (mb, bytes_var);
891 mono_mb_emit_byte (mb, MONO_CEE_ADD);
892 mono_mb_emit_stloc (mb, end_var);
893 mono_mb_emit_ldloc (mb, my_entry_var);
894 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
895 mono_mb_emit_byte (mb, MONO_CEE_ADD);
896 mono_mb_emit_stloc (mb, start_var);
900 * } while (start < end);
902 start_loop = mono_mb_get_label (mb);
903 mono_mb_emit_ldloc (mb, start_var);
904 mono_mb_emit_icon (mb, 0);
905 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
906 mono_mb_emit_ldloc (mb, start_var);
907 mono_mb_emit_icon (mb, sizeof (gpointer));
908 mono_mb_emit_byte (mb, MONO_CEE_ADD);
909 mono_mb_emit_stloc (mb, start_var);
911 mono_mb_emit_ldloc (mb, start_var);
912 mono_mb_emit_ldloc (mb, end_var);
913 mono_mb_emit_byte (mb, MONO_CEE_BLT_UN_S);
914 mono_mb_emit_byte (mb, start_loop - (mono_mb_get_label (mb) + 1));
915 } else if (atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING) {
916 /* need to clear just the sync pointer */
917 mono_mb_emit_ldloc (mb, my_entry_var);
918 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
919 mono_mb_emit_byte (mb, MONO_CEE_ADD);
920 mono_mb_emit_icon (mb, 0);
921 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
924 if (atype == ATYPE_STRING) {
925 /* need to set length and clear the last char */
926 /* s->length = len; */
927 mono_mb_emit_ldloc (mb, my_entry_var);
928 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, length));
929 mono_mb_emit_byte (mb, MONO_CEE_ADD);
930 mono_mb_emit_ldarg (mb, 1);
931 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
932 /* s->chars [len] = 0; */
933 mono_mb_emit_ldloc (mb, my_entry_var);
934 mono_mb_emit_ldloc (mb, bytes_var);
935 mono_mb_emit_icon (mb, 2);
936 mono_mb_emit_byte (mb, MONO_CEE_SUB);
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_I2);
942 /* return my_entry; */
943 mono_mb_emit_ldloc (mb, my_entry_var);
944 mono_mb_emit_byte (mb, MONO_CEE_RET);
946 mono_mb_patch_short_branch (mb, no_freelist_branch);
947 if (not_small_enough_branch > 0)
948 mono_mb_patch_short_branch (mb, not_small_enough_branch);
949 if (size_overflow_branch > 0)
950 mono_mb_patch_short_branch (mb, size_overflow_branch);
951 /* the slow path: we just call back into the runtime */
952 if (atype == ATYPE_STRING) {
953 mono_mb_emit_ldarg (mb, 1);
954 mono_mb_emit_icall (mb, mono_string_alloc);
956 mono_mb_emit_ldarg (mb, 0);
957 mono_mb_emit_icall (mb, mono_object_new_specific);
960 mono_mb_emit_byte (mb, MONO_CEE_RET);
962 res = mono_mb_create_method (mb, csig, 8);
964 mono_method_get_header (res)->init_locals = FALSE;
966 info = mono_image_alloc0 (mono_defaults.corlib, sizeof (AllocatorWrapperInfo));
967 info->gc_name = "boehm";
968 info->alloc_type = atype;
969 mono_marshal_set_wrapper_info (res, info);
974 static MonoMethod* alloc_method_cache [ATYPE_NUM];
976 static G_GNUC_UNUSED gboolean
977 mono_gc_is_critical_method (MonoMethod *method)
981 for (i = 0; i < ATYPE_NUM; ++i)
982 if (method == alloc_method_cache [i])
989 * If possible, generate a managed method that can quickly allocate objects in class
990 * @klass. The method will typically have an thread-local inline allocation sequence.
991 * The signature of the called method is:
992 * object allocate (MonoVTable *vtable)
993 * Some of the logic here is similar to mono_class_get_allocation_ftn () i object.c,
995 * The thread local alloc logic is taken from libgc/pthread_support.c.
999 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
1003 MonoClass *klass = vtable->klass;
1004 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
1006 /*g_print ("thread tls: %d\n", offset);*/
1009 if (!SMALL_ENOUGH (klass->instance_size))
1011 if (mono_class_has_finalizer (klass) || klass->marshalbyref || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
1015 if (klass->byval_arg.type == MONO_TYPE_STRING) {
1016 atype = ATYPE_STRING;
1017 } else if (!klass->has_references) {
1019 atype = ATYPE_FREEPTR_FOR_BOX;
1021 atype = ATYPE_FREEPTR;
1025 * disabled because we currently do a runtime choice anyway, to
1026 * deal with multiple appdomains.
1027 if (vtable->gc_descr != GC_NO_DESCRIPTOR)
1030 atype = ATYPE_NORMAL;
1033 return mono_gc_get_managed_allocator_by_type (atype);
1037 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
1043 * mono_gc_get_managed_allocator_by_type:
1045 * Return a managed allocator method corresponding to allocator type ATYPE.
1048 mono_gc_get_managed_allocator_by_type (int atype)
1052 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
1054 mono_loader_lock ();
1055 res = alloc_method_cache [atype];
1057 res = alloc_method_cache [atype] = create_allocator (atype, offset);
1058 mono_loader_unlock ();
1063 mono_gc_get_managed_allocator_types (void)
1069 mono_gc_get_write_barrier (void)
1071 g_assert_not_reached ();
1077 static G_GNUC_UNUSED gboolean
1078 mono_gc_is_critical_method (MonoMethod *method)
1084 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
1090 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
1096 mono_gc_get_managed_allocator_by_type (int atype)
1102 mono_gc_get_managed_allocator_types (void)
1108 mono_gc_get_write_barrier (void)
1110 g_assert_not_reached ();
1117 mono_gc_get_gc_name (void)
1123 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
1125 return GC_call_with_alloc_lock (func, data);
1129 mono_gc_get_description (void)
1131 return g_strdup (DEFAULT_GC_NAME);
1135 mono_gc_set_desktop_mode (void)
1141 mono_gc_is_moving (void)
1147 mono_gc_is_disabled (void)
1149 if (GC_dont_gc || g_getenv ("GC_DONT_GC"))
1156 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
1158 g_assert_not_reached ();
1163 mono_gc_get_card_table (int *shift_bits, gpointer *card_mask)
1165 g_assert_not_reached ();
1170 mono_gc_get_nursery (int *shift_bits, size_t *size)
1176 mono_gc_precise_stack_mark_enabled (void)
1182 mono_gc_get_logfile (void)
1188 mono_gc_conservatively_scan_area (void *start, void *end)
1190 g_assert_not_reached ();
1194 mono_gc_scan_object (void *obj)
1196 g_assert_not_reached ();
1201 mono_gc_get_bitmap_for_descr (void *descr, int *numbits)
1203 g_assert_not_reached ();
1208 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
1213 * These will call the redefined versions in libgc.
1219 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
1221 return pthread_create (new_thread, attr, start_routine, arg);
1225 mono_gc_pthread_join (pthread_t thread, void **retval)
1227 return pthread_join (thread, retval);
1231 mono_gc_pthread_detach (pthread_t thread)
1233 return pthread_detach (thread);
1239 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
1241 #ifdef USE_INCLUDED_LIBGC
1242 return GC_DllMain (module_handle, reason, reserved);
1249 #endif /* no Boehm GC */