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/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/atomic.h>
25 #include <mono/utils/mono-logger-internal.h>
26 #include <mono/utils/mono-memory-model.h>
27 #include <mono/utils/mono-time.h>
28 #include <mono/utils/mono-threads.h>
29 #include <mono/utils/dtrace.h>
30 #include <mono/utils/gc_wrapper.h>
31 #include <mono/utils/mono-mutex.h>
35 #ifdef USE_INCLUDED_LIBGC
38 #define THREAD_LOCAL_ALLOC 1
39 #include "private/pthread_support.h"
42 #if defined(PLATFORM_MACOSX) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
43 void *pthread_get_stackaddr_np(pthread_t);
46 #define GC_NO_DESCRIPTOR ((gpointer)(0 | GC_DS_LENGTH))
47 /*Boehm max heap cannot be smaller than 16MB*/
48 #define MIN_BOEHM_MAX_HEAP_SIZE_IN_MB 16
49 #define MIN_BOEHM_MAX_HEAP_SIZE (MIN_BOEHM_MAX_HEAP_SIZE_IN_MB << 20)
51 static gboolean gc_initialized = FALSE;
52 static mono_mutex_t mono_gc_lock;
55 boehm_thread_register (MonoThreadInfo* info, void *baseptr);
57 boehm_thread_unregister (MonoThreadInfo *p);
60 mono_gc_warning (char *msg, GC_word arg)
62 mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_GC, msg, (unsigned long)arg);
66 mono_gc_base_init (void)
68 MonoThreadInfoCallbacks cb;
76 * Handle the case when we are called from a thread different from the main thread,
78 * FIXME: Move this to libgc where it belongs.
80 * we used to do this only when running on valgrind,
81 * but it happens also in other setups.
83 #if defined(HAVE_PTHREAD_GETATTR_NP) && defined(HAVE_PTHREAD_ATTR_GETSTACK) && !defined(__native_client__)
88 pthread_getattr_np (pthread_self (), &attr);
89 pthread_attr_getstack (&attr, &sstart, &size);
90 pthread_attr_destroy (&attr);
91 /*g_print ("stackbottom pth is: %p\n", (char*)sstart + size);*/
94 * The calculation above doesn't seem to work on ia64, also we need to set
95 * GC_register_stackbottom as well, but don't know how.
98 /* apparently with some linuxthreads implementations sstart can be NULL,
99 * fallback to the more imprecise method (bug# 78096).
102 GC_stackbottom = (char*)sstart + size;
105 gsize stack_bottom = (gsize)&dummy;
106 stack_bottom += 4095;
107 stack_bottom &= ~4095;
108 GC_stackbottom = (char*)stack_bottom;
112 #elif defined(HAVE_PTHREAD_GET_STACKSIZE_NP) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
113 GC_stackbottom = (char*)pthread_get_stackaddr_np (pthread_self ());
114 #elif defined(__OpenBSD__)
115 # include <pthread_np.h>
120 rslt = pthread_stackseg_np(pthread_self(), &ss);
121 g_assert (rslt == 0);
123 GC_stackbottom = (char*)ss.ss_sp;
125 #elif defined(__native_client__)
126 /* Do nothing, GC_stackbottom is set correctly in libgc */
130 gsize stack_bottom = (gsize)&dummy;
131 stack_bottom += 4095;
132 stack_bottom &= ~4095;
133 /*g_print ("stackbottom is: %p\n", (char*)stack_bottom);*/
134 GC_stackbottom = (char*)stack_bottom;
138 #if !defined(PLATFORM_ANDROID)
139 /* If GC_no_dls is set to true, GC_find_limit is not called. This causes a seg fault on Android. */
143 GC_oom_fn = mono_gc_out_of_memory;
144 GC_set_warn_proc (mono_gc_warning);
145 GC_finalize_on_demand = 1;
146 GC_finalizer_notifier = mono_gc_finalize_notify;
148 #ifdef HAVE_GC_GCJ_MALLOC
149 GC_init_gcj_malloc (5, NULL);
152 #ifdef HAVE_GC_ALLOW_REGISTER_THREADS
153 GC_allow_register_threads();
156 if ((env = g_getenv ("MONO_GC_PARAMS"))) {
157 char **ptr, **opts = g_strsplit (env, ",", -1);
158 for (ptr = opts; *ptr; ++ptr) {
160 if (g_str_has_prefix (opt, "max-heap-size=")) {
163 opt = strchr (opt, '=') + 1;
164 if (*opt && mono_gc_parse_environment_string_extract_number (opt, &max_heap)) {
165 if (max_heap < MIN_BOEHM_MAX_HEAP_SIZE) {
166 fprintf (stderr, "max-heap-size must be at least %dMb.\n", MIN_BOEHM_MAX_HEAP_SIZE_IN_MB);
169 GC_set_max_heap_size (max_heap);
171 fprintf (stderr, "max-heap-size must be an integer.\n");
176 /* Could be a parameter for sgen */
178 fprintf (stderr, "MONO_GC_PARAMS must be a comma-delimited list of one or more of the following:\n");
179 fprintf (stderr, " max-heap-size=N (where N is an integer, possibly with a k, m or a g suffix)\n");
187 memset (&cb, 0, sizeof (cb));
188 cb.thread_register = boehm_thread_register;
189 cb.thread_unregister = boehm_thread_unregister;
190 cb.mono_method_is_critical = (gpointer)mono_runtime_is_critical_method;
192 cb.thread_exit = mono_gc_pthread_exit;
193 cb.mono_gc_pthread_create = (gpointer)mono_gc_pthread_create;
196 mono_threads_init (&cb, sizeof (MonoThreadInfo));
197 mono_mutex_init (&mono_gc_lock);
199 mono_thread_info_attach (&dummy);
201 mono_gc_enable_events ();
202 gc_initialized = TRUE;
207 * @generation: GC generation identifier
209 * Perform a garbage collection for the given generation, higher numbers
210 * mean usually older objects. Collecting a high-numbered generation
211 * implies collecting also the lower-numbered generations.
212 * The maximum value for @generation can be retrieved with a call to
213 * mono_gc_max_generation(), so this function is usually called as:
215 * mono_gc_collect (mono_gc_max_generation ());
218 mono_gc_collect (int generation)
220 #ifndef DISABLE_PERFCOUNTERS
221 mono_perfcounters->gc_induced++;
227 * mono_gc_max_generation:
229 * Get the maximum generation number used by the current garbage
230 * collector. The value will be 0 for the Boehm collector, 1 or more
231 * for the generational collectors.
233 * Returns: the maximum generation number.
236 mono_gc_max_generation (void)
242 * mono_gc_get_generation:
243 * @object: a managed object
245 * Get the garbage collector's generation that @object belongs to.
246 * Use this has a hint only.
248 * Returns: a garbage collector generation number
251 mono_gc_get_generation (MonoObject *object)
257 * mono_gc_collection_count:
258 * @generation: a GC generation number
260 * Get how many times a garbage collection has been performed
261 * for the given @generation number.
263 * Returns: the number of garbage collections
266 mono_gc_collection_count (int generation)
272 * mono_gc_add_memory_pressure:
273 * @value: amount of bytes
275 * Adjust the garbage collector's view of how many bytes of memory
276 * are indirectly referenced by managed objects (for example unmanaged
277 * memory holding image or other binary data).
278 * This is a hint only to the garbage collector algorithm.
279 * Note that negative amounts of @value will decrease the memory
283 mono_gc_add_memory_pressure (gint64 value)
288 * mono_gc_get_used_size:
290 * Get the approximate amount of memory used by managed objects.
292 * Returns: the amount of memory used in bytes
295 mono_gc_get_used_size (void)
297 return GC_get_heap_size () - GC_get_free_bytes ();
301 * mono_gc_get_heap_size:
303 * Get the amount of memory used by the garbage collector.
305 * Returns: the size of the heap in bytes
308 mono_gc_get_heap_size (void)
310 return GC_get_heap_size ();
314 mono_gc_is_gc_thread (void)
316 #if GC_VERSION_MAJOR >= 7
318 #elif defined(USE_INCLUDED_LIBGC)
319 return GC_thread_is_registered ();
325 extern int GC_thread_register_foreign (void *base_addr);
328 mono_gc_register_thread (void *baseptr)
330 return mono_thread_info_attach (baseptr) != NULL;
334 boehm_thread_register (MonoThreadInfo* info, void *baseptr)
336 #if GC_VERSION_MAJOR >= 7
337 struct GC_stack_base sb;
340 res = GC_get_stack_base (&sb);
341 if (res != GC_SUCCESS) {
342 sb.mem_base = baseptr;
344 /* Can't determine the register stack bounds */
345 g_error ("mono_gc_register_thread failed ().\n");
348 res = GC_register_my_thread (&sb);
349 if ((res != GC_SUCCESS) && (res != GC_DUPLICATE)) {
350 g_warning ("GC_register_my_thread () failed.\n");
355 if (mono_gc_is_gc_thread())
357 #if defined(USE_INCLUDED_LIBGC) && !defined(HOST_WIN32)
358 return GC_thread_register_foreign (baseptr) ? info : NULL;
366 boehm_thread_unregister (MonoThreadInfo *p)
368 MonoNativeThreadId tid;
370 tid = mono_thread_info_get_tid (p);
372 mono_threads_add_joinable_thread ((gpointer)tid);
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;
401 case MONO_GC_EVENT_PRE_STOP_WORLD:
402 MONO_GC_WORLD_STOP_BEGIN ();
403 mono_thread_info_suspend_lock ();
406 case MONO_GC_EVENT_POST_STOP_WORLD:
407 MONO_GC_WORLD_STOP_END ();
410 case MONO_GC_EVENT_PRE_START_WORLD:
411 MONO_GC_WORLD_RESTART_BEGIN (1);
414 case MONO_GC_EVENT_POST_START_WORLD:
415 MONO_GC_WORLD_RESTART_END (1);
416 mono_thread_info_suspend_unlock ();
419 case MONO_GC_EVENT_START:
421 #ifndef DISABLE_PERFCOUNTERS
422 if (mono_perfcounters)
423 mono_perfcounters->gc_collections0++;
425 gc_stats.major_gc_count ++;
426 gc_start_time = mono_100ns_ticks ();
429 case MONO_GC_EVENT_END:
431 #if defined(ENABLE_DTRACE) && defined(__sun__)
432 /* This works around a dtrace -G problem on Solaris.
433 Limit its actual use to when the probe is enabled. */
434 if (MONO_GC_END_ENABLED ())
438 #ifndef DISABLE_PERFCOUNTERS
439 if (mono_perfcounters) {
440 guint64 heap_size = GC_get_heap_size ();
441 guint64 used_size = heap_size - GC_get_free_bytes ();
442 mono_perfcounters->gc_total_bytes = used_size;
443 mono_perfcounters->gc_committed_bytes = heap_size;
444 mono_perfcounters->gc_reserved_bytes = heap_size;
445 mono_perfcounters->gc_gen0size = heap_size;
448 gc_stats.major_gc_time_usecs += (mono_100ns_ticks () - gc_start_time) / 10;
449 mono_trace_message (MONO_TRACE_GC, "gc took %d usecs", (mono_100ns_ticks () - gc_start_time) / 10);
453 mono_profiler_gc_event (e, 0);
457 on_gc_heap_resize (size_t new_size)
459 guint64 heap_size = GC_get_heap_size ();
460 #ifndef DISABLE_PERFCOUNTERS
461 if (mono_perfcounters) {
462 mono_perfcounters->gc_committed_bytes = heap_size;
463 mono_perfcounters->gc_reserved_bytes = heap_size;
464 mono_perfcounters->gc_gen0size = heap_size;
467 mono_profiler_gc_heap_resize (new_size);
471 mono_gc_enable_events (void)
473 GC_notify_event = on_gc_notification;
474 GC_on_heap_resize = on_gc_heap_resize;
480 mono_gc_enable_events (void)
487 mono_gc_register_root (char *start, size_t size, void *descr)
489 /* for some strange reason, they want one extra byte on the end */
490 GC_add_roots (start, start + size + 1);
496 mono_gc_deregister_root (char* addr)
499 /* FIXME: libgc doesn't define this work win32 for some reason */
500 /* FIXME: No size info */
501 GC_remove_roots (addr, addr + sizeof (gpointer) + 1);
506 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
508 /* libgc requires that we use HIDE_POINTER... */
509 *link_addr = (void*)HIDE_POINTER (obj);
511 GC_REGISTER_LONG_LINK (link_addr, obj);
513 GC_GENERAL_REGISTER_DISAPPEARING_LINK (link_addr, obj);
517 mono_gc_weak_link_remove (void **link_addr, gboolean track)
520 GC_unregister_long_link (link_addr);
522 GC_unregister_disappearing_link (link_addr);
527 reveal_link (gpointer link_addr)
529 void **link_a = link_addr;
530 return REVEAL_POINTER (*link_a);
534 mono_gc_weak_link_get (void **link_addr)
536 MonoObject *obj = GC_call_with_alloc_lock (reveal_link, link_addr);
537 if (obj == (MonoObject *) -1)
543 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
545 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
549 mono_gc_make_descr_for_object (gsize *bitmap, int numbits, size_t obj_size)
551 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
555 mono_gc_make_descr_for_array (int vector, gsize *elem_bitmap, int numbits, size_t elem_size)
557 /* libgc has no usable support for arrays... */
558 return GC_NO_DESCRIPTOR;
562 mono_gc_make_descr_from_bitmap (gsize *bitmap, int numbits)
564 #ifdef HAVE_GC_GCJ_MALLOC
565 /* It seems there are issues when the bitmap doesn't fit: play it safe */
567 return GC_NO_DESCRIPTOR;
569 return (gpointer)GC_make_descriptor ((GC_bitmap)bitmap, numbits);
576 mono_gc_make_root_descr_all_refs (int numbits)
582 mono_gc_alloc_fixed (size_t size, void *descr)
584 /* To help track down typed allocation bugs */
588 if (count == atoi (g_getenv ("COUNT2")))
590 if (count > atoi (g_getenv ("COUNT2")))
591 return GC_MALLOC (size);
595 return GC_MALLOC_EXPLICITLY_TYPED (size, (GC_descr)descr);
597 return GC_MALLOC (size);
601 mono_gc_free_fixed (void* addr)
606 mono_gc_invoke_finalizers (void)
608 /* There is a bug in GC_invoke_finalizer () in versions <= 6.2alpha4:
609 * the 'mem_freed' variable is not initialized when there are no
610 * objects to finalize, which leads to strange behavior later on.
611 * The check is necessary to work around that bug.
613 if (GC_should_invoke_finalizers ())
614 return GC_invoke_finalizers ();
619 mono_gc_pending_finalizers (void)
621 return GC_should_invoke_finalizers ();
625 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
627 *(void**)field_ptr = value;
631 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
633 *(void**)slot_ptr = value;
637 mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
639 mono_gc_memmove_aligned (dest_ptr, src_ptr, count * sizeof (gpointer));
643 mono_gc_wbarrier_generic_store (gpointer ptr, MonoObject* value)
645 *(void**)ptr = value;
649 mono_gc_wbarrier_generic_store_atomic (gpointer ptr, MonoObject *value)
651 InterlockedWritePointer (ptr, value);
655 mono_gc_wbarrier_generic_nostore (gpointer ptr)
660 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
662 mono_gc_memmove_atomic (dest, src, count * mono_class_value_size (klass, NULL));
666 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
668 /* do not copy the sync state */
669 mono_gc_memmove_aligned ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
670 mono_object_class (obj)->instance_size - sizeof (MonoObject));
674 mono_gc_clear_domain (MonoDomain *domain)
679 mono_gc_get_suspend_signal (void)
681 #ifdef USE_INCLUDED_GC
682 return GC_get_suspend_signal ();
688 #if defined(USE_INCLUDED_LIBGC) && defined(USE_COMPILER_TLS) && defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
689 extern __thread MONO_TLS_FAST void* GC_thread_tls;
690 #include "metadata-internals.h"
696 while (!(v & (1 << i)))
703 ATYPE_FREEPTR_FOR_BOX,
711 create_allocator (int atype, int tls_key)
713 int index_var, bytes_var, my_fl_var, my_entry_var;
714 guint32 no_freelist_branch, not_small_enough_branch = 0;
715 guint32 size_overflow_branch = 0;
716 MonoMethodBuilder *mb;
718 MonoMethodSignature *csig;
719 AllocatorWrapperInfo *info;
721 if (atype == ATYPE_STRING) {
722 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
723 csig->ret = &mono_defaults.string_class->byval_arg;
724 csig->params [0] = &mono_defaults.int_class->byval_arg;
725 csig->params [1] = &mono_defaults.int32_class->byval_arg;
727 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
728 csig->ret = &mono_defaults.object_class->byval_arg;
729 csig->params [0] = &mono_defaults.int_class->byval_arg;
732 mb = mono_mb_new (mono_defaults.object_class, "Alloc", MONO_WRAPPER_ALLOC);
733 bytes_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
734 if (atype == ATYPE_STRING) {
735 /* a string alloator method takes the args: (vtable, len) */
736 /* bytes = (sizeof (MonoString) + ((len + 1) * 2)); */
737 mono_mb_emit_ldarg (mb, 1);
738 mono_mb_emit_icon (mb, 1);
739 mono_mb_emit_byte (mb, MONO_CEE_ADD);
740 mono_mb_emit_icon (mb, 1);
741 mono_mb_emit_byte (mb, MONO_CEE_SHL);
742 // sizeof (MonoString) might include padding
743 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, chars));
744 mono_mb_emit_byte (mb, MONO_CEE_ADD);
745 mono_mb_emit_stloc (mb, bytes_var);
747 /* bytes = vtable->klass->instance_size */
748 mono_mb_emit_ldarg (mb, 0);
749 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoVTable, klass));
750 mono_mb_emit_byte (mb, MONO_CEE_ADD);
751 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
752 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoClass, instance_size));
753 mono_mb_emit_byte (mb, MONO_CEE_ADD);
754 /* FIXME: assert instance_size stays a 4 byte integer */
755 mono_mb_emit_byte (mb, MONO_CEE_LDIND_U4);
756 mono_mb_emit_stloc (mb, bytes_var);
759 /* this is needed for strings/arrays only as the other big types are never allocated with this method */
760 if (atype == ATYPE_STRING) {
762 /* if (!SMALL_ENOUGH (bytes)) jump slow_path;*/
763 mono_mb_emit_ldloc (mb, bytes_var);
764 mono_mb_emit_icon (mb, (NFREELISTS-1) * GRANULARITY);
765 not_small_enough_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
766 /* check for overflow */
767 mono_mb_emit_ldloc (mb, bytes_var);
768 mono_mb_emit_icon (mb, sizeof (MonoString));
769 size_overflow_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
772 /* int index = INDEX_FROM_BYTES(bytes); */
773 index_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
775 mono_mb_emit_ldloc (mb, bytes_var);
776 mono_mb_emit_icon (mb, GRANULARITY - 1);
777 mono_mb_emit_byte (mb, MONO_CEE_ADD);
778 mono_mb_emit_icon (mb, shift_amount (GRANULARITY));
779 mono_mb_emit_byte (mb, MONO_CEE_SHR_UN);
780 mono_mb_emit_icon (mb, shift_amount (sizeof (gpointer)));
781 mono_mb_emit_byte (mb, MONO_CEE_SHL);
782 /* index var is already adjusted into bytes */
783 mono_mb_emit_stloc (mb, index_var);
785 my_fl_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
786 my_entry_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
787 /* my_fl = ((GC_thread)tsd) -> ptrfree_freelists + index; */
788 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
789 mono_mb_emit_byte (mb, 0x0D); /* CEE_MONO_TLS */
790 mono_mb_emit_i4 (mb, tls_key);
791 if (atype == ATYPE_FREEPTR || atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING)
792 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, ptrfree_freelists));
793 else if (atype == ATYPE_NORMAL)
794 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, normal_freelists));
795 else if (atype == ATYPE_GCJ)
796 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, gcj_freelists));
798 g_assert_not_reached ();
799 mono_mb_emit_byte (mb, MONO_CEE_ADD);
800 mono_mb_emit_ldloc (mb, index_var);
801 mono_mb_emit_byte (mb, MONO_CEE_ADD);
802 mono_mb_emit_stloc (mb, my_fl_var);
804 /* my_entry = *my_fl; */
805 mono_mb_emit_ldloc (mb, my_fl_var);
806 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
807 mono_mb_emit_stloc (mb, my_entry_var);
809 /* if (EXPECT((word)my_entry >= HBLKSIZE, 1)) { */
810 mono_mb_emit_ldloc (mb, my_entry_var);
811 mono_mb_emit_icon (mb, HBLKSIZE);
812 no_freelist_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
814 /* ptr_t next = obj_link(my_entry); *my_fl = next; */
815 mono_mb_emit_ldloc (mb, my_fl_var);
816 mono_mb_emit_ldloc (mb, my_entry_var);
817 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
818 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
820 /* set the vtable and clear the words in the object */
821 mono_mb_emit_ldloc (mb, my_entry_var);
822 mono_mb_emit_ldarg (mb, 0);
823 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
825 if (atype == ATYPE_FREEPTR) {
826 int start_var, end_var, start_loop;
827 /* end = my_entry + bytes; start = my_entry + sizeof (gpointer);
829 start_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
830 end_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
831 mono_mb_emit_ldloc (mb, my_entry_var);
832 mono_mb_emit_ldloc (mb, bytes_var);
833 mono_mb_emit_byte (mb, MONO_CEE_ADD);
834 mono_mb_emit_stloc (mb, end_var);
835 mono_mb_emit_ldloc (mb, my_entry_var);
836 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
837 mono_mb_emit_byte (mb, MONO_CEE_ADD);
838 mono_mb_emit_stloc (mb, start_var);
842 * } while (start < end);
844 start_loop = mono_mb_get_label (mb);
845 mono_mb_emit_ldloc (mb, start_var);
846 mono_mb_emit_icon (mb, 0);
847 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
848 mono_mb_emit_ldloc (mb, start_var);
849 mono_mb_emit_icon (mb, sizeof (gpointer));
850 mono_mb_emit_byte (mb, MONO_CEE_ADD);
851 mono_mb_emit_stloc (mb, start_var);
853 mono_mb_emit_ldloc (mb, start_var);
854 mono_mb_emit_ldloc (mb, end_var);
855 mono_mb_emit_byte (mb, MONO_CEE_BLT_UN_S);
856 mono_mb_emit_byte (mb, start_loop - (mono_mb_get_label (mb) + 1));
857 } else if (atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING) {
858 /* need to clear just the sync pointer */
859 mono_mb_emit_ldloc (mb, my_entry_var);
860 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
861 mono_mb_emit_byte (mb, MONO_CEE_ADD);
862 mono_mb_emit_icon (mb, 0);
863 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
866 if (atype == ATYPE_STRING) {
867 /* need to set length and clear the last char */
868 /* s->length = len; */
869 mono_mb_emit_ldloc (mb, my_entry_var);
870 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, length));
871 mono_mb_emit_byte (mb, MONO_CEE_ADD);
872 mono_mb_emit_ldarg (mb, 1);
873 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
874 /* s->chars [len] = 0; */
875 mono_mb_emit_ldloc (mb, my_entry_var);
876 mono_mb_emit_ldloc (mb, bytes_var);
877 mono_mb_emit_icon (mb, 2);
878 mono_mb_emit_byte (mb, MONO_CEE_SUB);
879 mono_mb_emit_byte (mb, MONO_CEE_ADD);
880 mono_mb_emit_icon (mb, 0);
881 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
884 /* return my_entry; */
885 mono_mb_emit_ldloc (mb, my_entry_var);
886 mono_mb_emit_byte (mb, MONO_CEE_RET);
888 mono_mb_patch_short_branch (mb, no_freelist_branch);
889 if (not_small_enough_branch > 0)
890 mono_mb_patch_short_branch (mb, not_small_enough_branch);
891 if (size_overflow_branch > 0)
892 mono_mb_patch_short_branch (mb, size_overflow_branch);
893 /* the slow path: we just call back into the runtime */
894 if (atype == ATYPE_STRING) {
895 mono_mb_emit_ldarg (mb, 1);
896 mono_mb_emit_icall (mb, mono_string_alloc);
898 mono_mb_emit_ldarg (mb, 0);
899 mono_mb_emit_icall (mb, mono_object_new_specific);
902 mono_mb_emit_byte (mb, MONO_CEE_RET);
904 res = mono_mb_create_method (mb, csig, 8);
906 mono_method_get_header (res)->init_locals = FALSE;
908 info = mono_image_alloc0 (mono_defaults.corlib, sizeof (AllocatorWrapperInfo));
909 info->gc_name = "boehm";
910 info->alloc_type = atype;
911 mono_marshal_set_wrapper_info (res, info);
916 static MonoMethod* alloc_method_cache [ATYPE_NUM];
918 static G_GNUC_UNUSED gboolean
919 mono_gc_is_critical_method (MonoMethod *method)
923 for (i = 0; i < ATYPE_NUM; ++i)
924 if (method == alloc_method_cache [i])
931 * If possible, generate a managed method that can quickly allocate objects in class
932 * @klass. The method will typically have an thread-local inline allocation sequence.
933 * The signature of the called method is:
934 * object allocate (MonoVTable *vtable)
935 * Some of the logic here is similar to mono_class_get_allocation_ftn () i object.c,
937 * The thread local alloc logic is taken from libgc/pthread_support.c.
941 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box)
945 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
947 /*g_print ("thread tls: %d\n", offset);*/
950 if (!SMALL_ENOUGH (klass->instance_size))
952 if (mono_class_has_finalizer (klass) || mono_class_is_marshalbyref (klass) || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
956 if (mono_class_is_open_constructed_type (&klass->byval_arg))
958 if (klass->byval_arg.type == MONO_TYPE_STRING) {
959 atype = ATYPE_STRING;
960 } else if (!klass->has_references) {
962 atype = ATYPE_FREEPTR_FOR_BOX;
964 atype = ATYPE_FREEPTR;
968 * disabled because we currently do a runtime choice anyway, to
969 * deal with multiple appdomains.
970 if (vtable->gc_descr != GC_NO_DESCRIPTOR)
973 atype = ATYPE_NORMAL;
976 return mono_gc_get_managed_allocator_by_type (atype);
980 mono_gc_get_managed_array_allocator (MonoClass *klass)
986 * mono_gc_get_managed_allocator_by_type:
988 * Return a managed allocator method corresponding to allocator type ATYPE.
991 mono_gc_get_managed_allocator_by_type (int atype)
995 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
997 mono_tls_key_set_offset (TLS_KEY_BOEHM_GC_THREAD, offset);
999 res = alloc_method_cache [atype];
1003 res = create_allocator (atype, TLS_KEY_BOEHM_GC_THREAD);
1004 mono_mutex_lock (&mono_gc_lock);
1005 if (alloc_method_cache [atype]) {
1006 mono_free_method (res);
1007 res = alloc_method_cache [atype];
1009 mono_memory_barrier ();
1010 alloc_method_cache [atype] = res;
1012 mono_mutex_unlock (&mono_gc_lock);
1017 mono_gc_get_managed_allocator_types (void)
1023 mono_gc_get_write_barrier (void)
1025 g_assert_not_reached ();
1031 static G_GNUC_UNUSED gboolean
1032 mono_gc_is_critical_method (MonoMethod *method)
1038 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box)
1044 mono_gc_get_managed_array_allocator (MonoClass *klass)
1050 mono_gc_get_managed_allocator_by_type (int atype)
1056 mono_gc_get_managed_allocator_types (void)
1062 mono_gc_get_write_barrier (void)
1064 g_assert_not_reached ();
1071 mono_gc_get_gc_name (void)
1077 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
1079 return GC_call_with_alloc_lock (func, data);
1083 mono_gc_get_description (void)
1085 return g_strdup (DEFAULT_GC_NAME);
1089 mono_gc_set_desktop_mode (void)
1095 mono_gc_is_moving (void)
1101 mono_gc_is_disabled (void)
1103 if (GC_dont_gc || g_getenv ("GC_DONT_GC"))
1110 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
1112 g_assert_not_reached ();
1117 mono_gc_get_card_table (int *shift_bits, gpointer *card_mask)
1119 g_assert_not_reached ();
1124 mono_gc_card_table_nursery_check (void)
1126 g_assert_not_reached ();
1131 mono_gc_get_nursery (int *shift_bits, size_t *size)
1137 mono_gc_set_current_thread_appdomain (MonoDomain *domain)
1142 mono_gc_precise_stack_mark_enabled (void)
1148 mono_gc_get_logfile (void)
1154 mono_gc_conservatively_scan_area (void *start, void *end)
1156 g_assert_not_reached ();
1160 mono_gc_scan_object (void *obj)
1162 g_assert_not_reached ();
1167 mono_gc_get_bitmap_for_descr (void *descr, int *numbits)
1169 g_assert_not_reached ();
1174 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
1179 mono_gc_set_stack_end (void *stack_end)
1183 void mono_gc_set_skip_thread (gboolean value)
1188 mono_gc_register_for_finalization (MonoObject *obj, void *user_data)
1193 /* This assertion is not valid when GC_DEBUG is defined */
1194 g_assert (GC_base (obj) == (char*)obj - offset);
1197 GC_REGISTER_FINALIZER_NO_ORDER ((char*)obj - offset, user_data, GUINT_TO_POINTER (offset), NULL, NULL);
1201 * These will call the redefined versions in libgc.
1207 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
1209 return pthread_create (new_thread, attr, start_routine, arg);
1213 mono_gc_pthread_join (pthread_t thread, void **retval)
1215 return pthread_join (thread, retval);
1219 mono_gc_pthread_detach (pthread_t thread)
1221 return pthread_detach (thread);
1225 mono_gc_pthread_exit (void *retval)
1227 pthread_exit (retval);
1233 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
1235 #ifdef USE_INCLUDED_LIBGC
1236 return GC_DllMain (module_handle, reason, reserved);
1244 mono_gc_get_vtable_bits (MonoClass *class)
1250 * mono_gc_register_altstack:
1252 * Register the dimensions of the normal stack and altstack with the collector.
1253 * Currently, STACK/STACK_SIZE is only used when the thread is suspended while it is on an altstack.
1256 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
1258 #ifdef USE_INCLUDED_LIBGC
1259 GC_register_altstack (stack, stack_size, altstack, altstack_size);
1264 mono_gc_get_los_limit (void)
1270 mono_gc_user_markers_supported (void)
1276 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
1278 g_assert_not_reached ();
1283 mono_gc_set_allow_synchronous_major (gboolean flag)
1288 #endif /* no Boehm GC */