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;
177 cb.mono_gc_pthread_create = (gpointer)mono_gc_pthread_create;
180 mono_threads_init (&cb, sizeof (MonoThreadInfo));
182 mono_gc_enable_events ();
183 gc_initialized = TRUE;
188 * @generation: GC generation identifier
190 * Perform a garbage collection for the given generation, higher numbers
191 * mean usually older objects. Collecting a high-numbered generation
192 * implies collecting also the lower-numbered generations.
193 * The maximum value for @generation can be retrieved with a call to
194 * mono_gc_max_generation(), so this function is usually called as:
196 * mono_gc_collect (mono_gc_max_generation ());
199 mono_gc_collect (int generation)
201 MONO_PROBE_GC_BEGIN (generation);
203 mono_perfcounters->gc_induced++;
206 MONO_PROBE_GC_END (generation);
207 #if defined(ENABLE_DTRACE) && defined(__sun__)
208 /* This works around a dtrace -G problem on Solaris.
209 Limit its actual use to when the probe is enabled. */
210 if (MONO_PROBE_GC_END_ENABLED ())
216 * mono_gc_max_generation:
218 * Get the maximum generation number used by the current garbage
219 * collector. The value will be 0 for the Boehm collector, 1 or more
220 * for the generational collectors.
222 * Returns: the maximum generation number.
225 mono_gc_max_generation (void)
231 * mono_gc_get_generation:
232 * @object: a managed object
234 * Get the garbage collector's generation that @object belongs to.
235 * Use this has a hint only.
237 * Returns: a garbage collector generation number
240 mono_gc_get_generation (MonoObject *object)
246 * mono_gc_collection_count:
247 * @generation: a GC generation number
249 * Get how many times a garbage collection has been performed
250 * for the given @generation number.
252 * Returns: the number of garbage collections
255 mono_gc_collection_count (int generation)
261 * mono_gc_add_memory_pressure:
262 * @value: amount of bytes
264 * Adjust the garbage collector's view of how many bytes of memory
265 * are indirectly referenced by managed objects (for example unmanaged
266 * memory holding image or other binary data).
267 * This is a hint only to the garbage collector algorithm.
268 * Note that negative amounts of @value will decrease the memory
272 mono_gc_add_memory_pressure (gint64 value)
277 * mono_gc_get_used_size:
279 * Get the approximate amount of memory used by managed objects.
281 * Returns: the amount of memory used in bytes
284 mono_gc_get_used_size (void)
286 return GC_get_heap_size () - GC_get_free_bytes ();
290 * mono_gc_get_heap_size:
292 * Get the amount of memory used by the garbage collector.
294 * Returns: the size of the heap in bytes
297 mono_gc_get_heap_size (void)
299 return GC_get_heap_size ();
303 mono_gc_disable (void)
305 #ifdef HAVE_GC_ENABLE
308 g_assert_not_reached ();
313 mono_gc_enable (void)
315 #ifdef HAVE_GC_ENABLE
318 g_assert_not_reached ();
323 mono_gc_is_gc_thread (void)
325 #if GC_VERSION_MAJOR >= 7
327 #elif defined(USE_INCLUDED_LIBGC)
328 return GC_thread_is_registered ();
334 extern int GC_thread_register_foreign (void *base_addr);
337 mono_gc_register_thread (void *baseptr)
339 return mono_thread_info_attach (baseptr) != NULL;
343 boehm_thread_register (MonoThreadInfo* info, void *baseptr)
345 #if GC_VERSION_MAJOR >= 7
346 struct GC_stack_base sb;
349 res = GC_get_stack_base (&sb);
350 if (res != GC_SUCCESS) {
351 sb.mem_base = baseptr;
353 /* Can't determine the register stack bounds */
354 g_error ("mono_gc_register_thread failed ().\n");
357 res = GC_register_my_thread (&sb);
358 if ((res != GC_SUCCESS) && (res != GC_DUPLICATE)) {
359 g_warning ("GC_register_my_thread () failed.\n");
364 if (mono_gc_is_gc_thread())
366 #if defined(USE_INCLUDED_LIBGC) && !defined(HOST_WIN32)
367 return GC_thread_register_foreign (baseptr) ? info : NULL;
375 mono_object_is_alive (MonoObject* o)
377 #ifdef USE_INCLUDED_LIBGC
378 return GC_is_marked ((gpointer)o);
385 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
390 #ifdef USE_INCLUDED_LIBGC
392 static gint64 gc_start_time;
395 on_gc_notification (GCEventType event)
397 MonoGCEvent e = (MonoGCEvent)event;
399 if (e == MONO_GC_EVENT_PRE_STOP_WORLD)
400 mono_thread_info_suspend_lock ();
401 else if (e == MONO_GC_EVENT_POST_START_WORLD)
402 mono_thread_info_suspend_unlock ();
404 if (e == MONO_GC_EVENT_START) {
405 if (mono_perfcounters)
406 mono_perfcounters->gc_collections0++;
407 mono_stats.major_gc_count ++;
408 gc_start_time = mono_100ns_ticks ();
409 } else if (e == MONO_GC_EVENT_END) {
410 if (mono_perfcounters) {
411 guint64 heap_size = GC_get_heap_size ();
412 guint64 used_size = heap_size - GC_get_free_bytes ();
413 mono_perfcounters->gc_total_bytes = used_size;
414 mono_perfcounters->gc_committed_bytes = heap_size;
415 mono_perfcounters->gc_reserved_bytes = heap_size;
416 mono_perfcounters->gc_gen0size = heap_size;
418 mono_stats.major_gc_time_usecs += (mono_100ns_ticks () - gc_start_time) / 10;
419 mono_trace_message (MONO_TRACE_GC, "gc took %d usecs", (mono_100ns_ticks () - gc_start_time) / 10);
421 mono_profiler_gc_event (e, 0);
425 on_gc_heap_resize (size_t new_size)
427 guint64 heap_size = GC_get_heap_size ();
428 if (mono_perfcounters) {
429 mono_perfcounters->gc_committed_bytes = heap_size;
430 mono_perfcounters->gc_reserved_bytes = heap_size;
431 mono_perfcounters->gc_gen0size = heap_size;
433 mono_profiler_gc_heap_resize (new_size);
437 mono_gc_enable_events (void)
439 GC_notify_event = on_gc_notification;
440 GC_on_heap_resize = on_gc_heap_resize;
446 mono_gc_enable_events (void)
453 mono_gc_register_root (char *start, size_t size, void *descr)
455 /* for some strange reason, they want one extra byte on the end */
456 GC_add_roots (start, start + size + 1);
462 mono_gc_deregister_root (char* addr)
465 /* FIXME: libgc doesn't define this work win32 for some reason */
466 /* FIXME: No size info */
467 GC_remove_roots (addr, addr + sizeof (gpointer) + 1);
472 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
474 /* libgc requires that we use HIDE_POINTER... */
475 *link_addr = (void*)HIDE_POINTER (obj);
476 GC_GENERAL_REGISTER_DISAPPEARING_LINK (link_addr, obj);
480 mono_gc_weak_link_remove (void **link_addr)
482 GC_unregister_disappearing_link (link_addr);
487 reveal_link (gpointer link_addr)
489 void **link_a = link_addr;
490 return REVEAL_POINTER (*link_a);
494 mono_gc_weak_link_get (void **link_addr)
496 MonoObject *obj = GC_call_with_alloc_lock (reveal_link, link_addr);
497 if (obj == (MonoObject *) -1)
503 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
505 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
509 mono_gc_make_descr_for_object (gsize *bitmap, int numbits, size_t obj_size)
511 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
515 mono_gc_make_descr_for_array (int vector, gsize *elem_bitmap, int numbits, size_t elem_size)
517 /* libgc has no usable support for arrays... */
518 return GC_NO_DESCRIPTOR;
522 mono_gc_make_descr_from_bitmap (gsize *bitmap, int numbits)
524 #ifdef HAVE_GC_GCJ_MALLOC
525 /* It seems there are issues when the bitmap doesn't fit: play it safe */
527 return GC_NO_DESCRIPTOR;
529 return (gpointer)GC_make_descriptor ((GC_bitmap)bitmap, numbits);
536 mono_gc_make_root_descr_all_refs (int numbits)
542 mono_gc_alloc_fixed (size_t size, void *descr)
544 /* To help track down typed allocation bugs */
548 if (count == atoi (getenv ("COUNT2")))
550 if (count > atoi (getenv ("COUNT2")))
551 return GC_MALLOC (size);
555 return GC_MALLOC_EXPLICITLY_TYPED (size, (GC_descr)descr);
557 return GC_MALLOC (size);
561 mono_gc_free_fixed (void* addr)
566 mono_gc_invoke_finalizers (void)
568 /* There is a bug in GC_invoke_finalizer () in versions <= 6.2alpha4:
569 * the 'mem_freed' variable is not initialized when there are no
570 * objects to finalize, which leads to strange behavior later on.
571 * The check is necessary to work around that bug.
573 if (GC_should_invoke_finalizers ())
574 return GC_invoke_finalizers ();
579 mono_gc_pending_finalizers (void)
581 return GC_should_invoke_finalizers ();
585 * LOCKING: Assumes the domain_finalizers lock is held.
588 add_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
592 if (!domain->track_resurrection_objects_hash)
593 domain->track_resurrection_objects_hash = g_hash_table_new (mono_aligned_addr_hash, NULL);
595 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
596 refs = g_slist_prepend (refs, GUINT_TO_POINTER (gchandle));
597 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
601 mono_gc_add_weak_track_handle (MonoObject *obj, guint32 handle)
608 domain = mono_object_get_domain (obj);
610 mono_domain_finalizers_lock (domain);
612 add_weak_track_handle_internal (domain, obj, handle);
614 g_hash_table_insert (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (handle), obj);
616 mono_domain_finalizers_unlock (domain);
620 * LOCKING: Assumes the domain_finalizers lock is held.
623 remove_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
627 if (!domain->track_resurrection_objects_hash)
630 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
631 refs = g_slist_remove (refs, GUINT_TO_POINTER (gchandle));
632 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
636 mono_gc_change_weak_track_handle (MonoObject *old_obj, MonoObject *obj, guint32 gchandle)
638 MonoDomain *domain = mono_domain_get ();
640 mono_domain_finalizers_lock (domain);
643 remove_weak_track_handle_internal (domain, old_obj, gchandle);
645 add_weak_track_handle_internal (domain, obj, gchandle);
647 mono_domain_finalizers_unlock (domain);
651 mono_gc_remove_weak_track_handle (guint32 gchandle)
653 MonoDomain *domain = mono_domain_get ();
656 /* Clean our entries in the two hashes in MonoDomain */
658 mono_domain_finalizers_lock (domain);
660 /* Get the original object this handle pointed to */
661 obj = g_hash_table_lookup (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
663 g_hash_table_remove (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
665 remove_weak_track_handle_internal (domain, obj, gchandle);
668 mono_domain_finalizers_unlock (domain);
672 mono_gc_remove_weak_track_object (MonoDomain *domain, MonoObject *obj)
676 if (domain->track_resurrection_objects_hash) {
677 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
681 * Since we don't run finalizers again for resurrected objects,
682 * no need to keep these around.
684 g_hash_table_remove (domain->track_resurrection_objects_hash, obj);
691 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
693 *(void**)field_ptr = value;
697 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
699 *(void**)slot_ptr = value;
703 mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
705 mono_gc_memmove (dest_ptr, src_ptr, count * sizeof (gpointer));
709 mono_gc_wbarrier_generic_store (gpointer ptr, MonoObject* value)
711 *(void**)ptr = value;
715 mono_gc_wbarrier_generic_nostore (gpointer ptr)
720 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
722 mono_gc_memmove (dest, src, count * mono_class_value_size (klass, NULL));
726 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
728 /* do not copy the sync state */
729 mono_gc_memmove ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
730 mono_object_class (obj)->instance_size - sizeof (MonoObject));
734 mono_gc_clear_domain (MonoDomain *domain)
739 mono_gc_get_suspend_signal (void)
741 #ifdef USE_INCLUDED_GC
742 return GC_get_suspend_signal ();
748 #if defined(USE_INCLUDED_LIBGC) && defined(USE_COMPILER_TLS) && defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
749 extern __thread MONO_TLS_FAST void* GC_thread_tls;
750 #include "metadata-internals.h"
756 while (!(v & (1 << i)))
763 ATYPE_FREEPTR_FOR_BOX,
771 create_allocator (int atype, int offset)
773 int index_var, bytes_var, my_fl_var, my_entry_var;
774 guint32 no_freelist_branch, not_small_enough_branch = 0;
775 guint32 size_overflow_branch = 0;
776 MonoMethodBuilder *mb;
778 MonoMethodSignature *csig;
779 AllocatorWrapperInfo *info;
781 if (atype == ATYPE_STRING) {
782 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
783 csig->ret = &mono_defaults.string_class->byval_arg;
784 csig->params [0] = &mono_defaults.int_class->byval_arg;
785 csig->params [1] = &mono_defaults.int32_class->byval_arg;
787 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
788 csig->ret = &mono_defaults.object_class->byval_arg;
789 csig->params [0] = &mono_defaults.int_class->byval_arg;
792 mb = mono_mb_new (mono_defaults.object_class, "Alloc", MONO_WRAPPER_ALLOC);
793 bytes_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
794 if (atype == ATYPE_STRING) {
795 /* a string alloator method takes the args: (vtable, len) */
796 /* bytes = (sizeof (MonoString) + ((len + 1) * 2)); */
797 mono_mb_emit_ldarg (mb, 1);
798 mono_mb_emit_icon (mb, 1);
799 mono_mb_emit_byte (mb, MONO_CEE_ADD);
800 mono_mb_emit_icon (mb, 1);
801 mono_mb_emit_byte (mb, MONO_CEE_SHL);
802 // sizeof (MonoString) might include padding
803 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, chars));
804 mono_mb_emit_byte (mb, MONO_CEE_ADD);
805 mono_mb_emit_stloc (mb, bytes_var);
807 /* bytes = vtable->klass->instance_size */
808 mono_mb_emit_ldarg (mb, 0);
809 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoVTable, klass));
810 mono_mb_emit_byte (mb, MONO_CEE_ADD);
811 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
812 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoClass, instance_size));
813 mono_mb_emit_byte (mb, MONO_CEE_ADD);
814 /* FIXME: assert instance_size stays a 4 byte integer */
815 mono_mb_emit_byte (mb, MONO_CEE_LDIND_U4);
816 mono_mb_emit_stloc (mb, bytes_var);
819 /* this is needed for strings/arrays only as the other big types are never allocated with this method */
820 if (atype == ATYPE_STRING) {
822 /* if (!SMALL_ENOUGH (bytes)) jump slow_path;*/
823 mono_mb_emit_ldloc (mb, bytes_var);
824 mono_mb_emit_icon (mb, (NFREELISTS-1) * GRANULARITY);
825 not_small_enough_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
826 /* check for overflow */
827 mono_mb_emit_ldloc (mb, bytes_var);
828 mono_mb_emit_icon (mb, sizeof (MonoString));
829 size_overflow_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
832 /* int index = INDEX_FROM_BYTES(bytes); */
833 index_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
835 mono_mb_emit_ldloc (mb, bytes_var);
836 mono_mb_emit_icon (mb, GRANULARITY - 1);
837 mono_mb_emit_byte (mb, MONO_CEE_ADD);
838 mono_mb_emit_icon (mb, shift_amount (GRANULARITY));
839 mono_mb_emit_byte (mb, MONO_CEE_SHR_UN);
840 mono_mb_emit_icon (mb, shift_amount (sizeof (gpointer)));
841 mono_mb_emit_byte (mb, MONO_CEE_SHL);
842 /* index var is already adjusted into bytes */
843 mono_mb_emit_stloc (mb, index_var);
845 my_fl_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
846 my_entry_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
847 /* my_fl = ((GC_thread)tsd) -> ptrfree_freelists + index; */
848 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
849 mono_mb_emit_byte (mb, 0x0D); /* CEE_MONO_TLS */
850 mono_mb_emit_i4 (mb, offset);
851 if (atype == ATYPE_FREEPTR || atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING)
852 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, ptrfree_freelists));
853 else if (atype == ATYPE_NORMAL)
854 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, normal_freelists));
855 else if (atype == ATYPE_GCJ)
856 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, gcj_freelists));
858 g_assert_not_reached ();
859 mono_mb_emit_byte (mb, MONO_CEE_ADD);
860 mono_mb_emit_ldloc (mb, index_var);
861 mono_mb_emit_byte (mb, MONO_CEE_ADD);
862 mono_mb_emit_stloc (mb, my_fl_var);
864 /* my_entry = *my_fl; */
865 mono_mb_emit_ldloc (mb, my_fl_var);
866 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
867 mono_mb_emit_stloc (mb, my_entry_var);
869 /* if (EXPECT((word)my_entry >= HBLKSIZE, 1)) { */
870 mono_mb_emit_ldloc (mb, my_entry_var);
871 mono_mb_emit_icon (mb, HBLKSIZE);
872 no_freelist_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
874 /* ptr_t next = obj_link(my_entry); *my_fl = next; */
875 mono_mb_emit_ldloc (mb, my_fl_var);
876 mono_mb_emit_ldloc (mb, my_entry_var);
877 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
878 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
880 /* set the vtable and clear the words in the object */
881 mono_mb_emit_ldloc (mb, my_entry_var);
882 mono_mb_emit_ldarg (mb, 0);
883 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
885 if (atype == ATYPE_FREEPTR) {
886 int start_var, end_var, start_loop;
887 /* end = my_entry + bytes; start = my_entry + sizeof (gpointer);
889 start_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
890 end_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
891 mono_mb_emit_ldloc (mb, my_entry_var);
892 mono_mb_emit_ldloc (mb, bytes_var);
893 mono_mb_emit_byte (mb, MONO_CEE_ADD);
894 mono_mb_emit_stloc (mb, end_var);
895 mono_mb_emit_ldloc (mb, my_entry_var);
896 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
897 mono_mb_emit_byte (mb, MONO_CEE_ADD);
898 mono_mb_emit_stloc (mb, start_var);
902 * } while (start < end);
904 start_loop = mono_mb_get_label (mb);
905 mono_mb_emit_ldloc (mb, start_var);
906 mono_mb_emit_icon (mb, 0);
907 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
908 mono_mb_emit_ldloc (mb, start_var);
909 mono_mb_emit_icon (mb, sizeof (gpointer));
910 mono_mb_emit_byte (mb, MONO_CEE_ADD);
911 mono_mb_emit_stloc (mb, start_var);
913 mono_mb_emit_ldloc (mb, start_var);
914 mono_mb_emit_ldloc (mb, end_var);
915 mono_mb_emit_byte (mb, MONO_CEE_BLT_UN_S);
916 mono_mb_emit_byte (mb, start_loop - (mono_mb_get_label (mb) + 1));
917 } else if (atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING) {
918 /* need to clear just the sync pointer */
919 mono_mb_emit_ldloc (mb, my_entry_var);
920 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
921 mono_mb_emit_byte (mb, MONO_CEE_ADD);
922 mono_mb_emit_icon (mb, 0);
923 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
926 if (atype == ATYPE_STRING) {
927 /* need to set length and clear the last char */
928 /* s->length = len; */
929 mono_mb_emit_ldloc (mb, my_entry_var);
930 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, length));
931 mono_mb_emit_byte (mb, MONO_CEE_ADD);
932 mono_mb_emit_ldarg (mb, 1);
933 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
934 /* s->chars [len] = 0; */
935 mono_mb_emit_ldloc (mb, my_entry_var);
936 mono_mb_emit_ldloc (mb, bytes_var);
937 mono_mb_emit_icon (mb, 2);
938 mono_mb_emit_byte (mb, MONO_CEE_SUB);
939 mono_mb_emit_byte (mb, MONO_CEE_ADD);
940 mono_mb_emit_icon (mb, 0);
941 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
944 /* return my_entry; */
945 mono_mb_emit_ldloc (mb, my_entry_var);
946 mono_mb_emit_byte (mb, MONO_CEE_RET);
948 mono_mb_patch_short_branch (mb, no_freelist_branch);
949 if (not_small_enough_branch > 0)
950 mono_mb_patch_short_branch (mb, not_small_enough_branch);
951 if (size_overflow_branch > 0)
952 mono_mb_patch_short_branch (mb, size_overflow_branch);
953 /* the slow path: we just call back into the runtime */
954 if (atype == ATYPE_STRING) {
955 mono_mb_emit_ldarg (mb, 1);
956 mono_mb_emit_icall (mb, mono_string_alloc);
958 mono_mb_emit_ldarg (mb, 0);
959 mono_mb_emit_icall (mb, mono_object_new_specific);
962 mono_mb_emit_byte (mb, MONO_CEE_RET);
964 res = mono_mb_create_method (mb, csig, 8);
966 mono_method_get_header (res)->init_locals = FALSE;
968 info = mono_image_alloc0 (mono_defaults.corlib, sizeof (AllocatorWrapperInfo));
969 info->gc_name = "boehm";
970 info->alloc_type = atype;
971 mono_marshal_set_wrapper_info (res, info);
976 static MonoMethod* alloc_method_cache [ATYPE_NUM];
978 static G_GNUC_UNUSED gboolean
979 mono_gc_is_critical_method (MonoMethod *method)
983 for (i = 0; i < ATYPE_NUM; ++i)
984 if (method == alloc_method_cache [i])
991 * If possible, generate a managed method that can quickly allocate objects in class
992 * @klass. The method will typically have an thread-local inline allocation sequence.
993 * The signature of the called method is:
994 * object allocate (MonoVTable *vtable)
995 * Some of the logic here is similar to mono_class_get_allocation_ftn () i object.c,
997 * The thread local alloc logic is taken from libgc/pthread_support.c.
1001 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
1005 MonoClass *klass = vtable->klass;
1006 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
1008 /*g_print ("thread tls: %d\n", offset);*/
1011 if (!SMALL_ENOUGH (klass->instance_size))
1013 if (mono_class_has_finalizer (klass) || klass->marshalbyref || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
1017 if (klass->byval_arg.type == MONO_TYPE_STRING) {
1018 atype = ATYPE_STRING;
1019 } else if (!klass->has_references) {
1021 atype = ATYPE_FREEPTR_FOR_BOX;
1023 atype = ATYPE_FREEPTR;
1027 * disabled because we currently do a runtime choice anyway, to
1028 * deal with multiple appdomains.
1029 if (vtable->gc_descr != GC_NO_DESCRIPTOR)
1032 atype = ATYPE_NORMAL;
1035 return mono_gc_get_managed_allocator_by_type (atype);
1039 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
1045 * mono_gc_get_managed_allocator_by_type:
1047 * Return a managed allocator method corresponding to allocator type ATYPE.
1050 mono_gc_get_managed_allocator_by_type (int atype)
1054 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
1056 mono_loader_lock ();
1057 res = alloc_method_cache [atype];
1059 res = alloc_method_cache [atype] = create_allocator (atype, offset);
1060 mono_loader_unlock ();
1065 mono_gc_get_managed_allocator_types (void)
1071 mono_gc_get_write_barrier (void)
1073 g_assert_not_reached ();
1079 static G_GNUC_UNUSED gboolean
1080 mono_gc_is_critical_method (MonoMethod *method)
1086 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
1092 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
1098 mono_gc_get_managed_allocator_by_type (int atype)
1104 mono_gc_get_managed_allocator_types (void)
1110 mono_gc_get_write_barrier (void)
1112 g_assert_not_reached ();
1119 mono_gc_get_gc_name (void)
1125 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
1127 return GC_call_with_alloc_lock (func, data);
1131 mono_gc_get_description (void)
1133 return g_strdup (DEFAULT_GC_NAME);
1137 mono_gc_set_desktop_mode (void)
1143 mono_gc_is_moving (void)
1149 mono_gc_is_disabled (void)
1151 if (GC_dont_gc || g_getenv ("GC_DONT_GC"))
1158 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
1160 g_assert_not_reached ();
1165 mono_gc_get_card_table (int *shift_bits, gpointer *card_mask)
1167 g_assert_not_reached ();
1172 mono_gc_get_nursery (int *shift_bits, size_t *size)
1178 mono_gc_precise_stack_mark_enabled (void)
1184 mono_gc_get_logfile (void)
1190 mono_gc_conservatively_scan_area (void *start, void *end)
1192 g_assert_not_reached ();
1196 mono_gc_scan_object (void *obj)
1198 g_assert_not_reached ();
1203 mono_gc_get_bitmap_for_descr (void *descr, int *numbits)
1205 g_assert_not_reached ();
1210 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
1215 * These will call the redefined versions in libgc.
1221 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
1223 return pthread_create (new_thread, attr, start_routine, arg);
1227 mono_gc_pthread_join (pthread_t thread, void **retval)
1229 return pthread_join (thread, retval);
1233 mono_gc_pthread_detach (pthread_t thread)
1235 return pthread_detach (thread);
1241 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
1243 #ifdef USE_INCLUDED_LIBGC
1244 return GC_DllMain (module_handle, reason, reserved);
1251 #endif /* no Boehm GC */