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);
58 mono_gc_warning (char *msg, GC_word arg)
60 mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_GC, msg, (unsigned long)arg);
64 mono_gc_base_init (void)
66 MonoThreadInfoCallbacks cb;
73 * Handle the case when we are called from a thread different from the main thread,
75 * FIXME: Move this to libgc where it belongs.
77 * we used to do this only when running on valgrind,
78 * but it happens also in other setups.
80 #if defined(HAVE_PTHREAD_GETATTR_NP) && defined(HAVE_PTHREAD_ATTR_GETSTACK) && !defined(__native_client__)
85 pthread_getattr_np (pthread_self (), &attr);
86 pthread_attr_getstack (&attr, &sstart, &size);
87 pthread_attr_destroy (&attr);
88 /*g_print ("stackbottom pth is: %p\n", (char*)sstart + size);*/
91 * The calculation above doesn't seem to work on ia64, also we need to set
92 * GC_register_stackbottom as well, but don't know how.
95 /* apparently with some linuxthreads implementations sstart can be NULL,
96 * fallback to the more imprecise method (bug# 78096).
99 GC_stackbottom = (char*)sstart + size;
102 gsize stack_bottom = (gsize)&dummy;
103 stack_bottom += 4095;
104 stack_bottom &= ~4095;
105 GC_stackbottom = (char*)stack_bottom;
109 #elif defined(HAVE_PTHREAD_GET_STACKSIZE_NP) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
110 GC_stackbottom = (char*)pthread_get_stackaddr_np (pthread_self ());
111 #elif defined(__OpenBSD__)
112 # include <pthread_np.h>
117 rslt = pthread_stackseg_np(pthread_self(), &ss);
118 g_assert (rslt == 0);
120 GC_stackbottom = (char*)ss.ss_sp;
122 #elif defined(__native_client__)
123 /* Do nothing, GC_stackbottom is set correctly in libgc */
127 gsize stack_bottom = (gsize)&dummy;
128 stack_bottom += 4095;
129 stack_bottom &= ~4095;
130 /*g_print ("stackbottom is: %p\n", (char*)stack_bottom);*/
131 GC_stackbottom = (char*)stack_bottom;
135 #if !defined(PLATFORM_ANDROID)
136 /* If GC_no_dls is set to true, GC_find_limit is not called. This causes a seg fault on Android. */
140 GC_oom_fn = mono_gc_out_of_memory;
141 GC_set_warn_proc (mono_gc_warning);
142 GC_finalize_on_demand = 1;
143 GC_finalizer_notifier = mono_gc_finalize_notify;
145 #ifdef HAVE_GC_GCJ_MALLOC
146 GC_init_gcj_malloc (5, NULL);
149 #ifdef HAVE_GC_ALLOW_REGISTER_THREADS
150 GC_allow_register_threads();
153 if ((env = g_getenv ("MONO_GC_PARAMS"))) {
154 char **ptr, **opts = g_strsplit (env, ",", -1);
155 for (ptr = opts; *ptr; ++ptr) {
157 if (g_str_has_prefix (opt, "max-heap-size=")) {
160 opt = strchr (opt, '=') + 1;
161 if (*opt && mono_gc_parse_environment_string_extract_number (opt, &max_heap)) {
162 if (max_heap < MIN_BOEHM_MAX_HEAP_SIZE) {
163 fprintf (stderr, "max-heap-size must be at least %dMb.\n", MIN_BOEHM_MAX_HEAP_SIZE_IN_MB);
166 GC_set_max_heap_size (max_heap);
168 fprintf (stderr, "max-heap-size must be an integer.\n");
173 /* Could be a parameter for sgen */
175 fprintf (stderr, "MONO_GC_PARAMS must be a comma-delimited list of one or more of the following:\n");
176 fprintf (stderr, " max-heap-size=N (where N is an integer, possibly with a k, m or a g suffix)\n");
184 memset (&cb, 0, sizeof (cb));
185 cb.thread_register = boehm_thread_register;
186 cb.mono_method_is_critical = (gpointer)mono_runtime_is_critical_method;
188 cb.mono_gc_pthread_create = (gpointer)mono_gc_pthread_create;
191 mono_threads_init (&cb, sizeof (MonoThreadInfo));
192 mono_mutex_init (&mono_gc_lock);
194 mono_gc_enable_events ();
195 gc_initialized = TRUE;
200 * @generation: GC generation identifier
202 * Perform a garbage collection for the given generation, higher numbers
203 * mean usually older objects. Collecting a high-numbered generation
204 * implies collecting also the lower-numbered generations.
205 * The maximum value for @generation can be retrieved with a call to
206 * mono_gc_max_generation(), so this function is usually called as:
208 * mono_gc_collect (mono_gc_max_generation ());
211 mono_gc_collect (int generation)
213 #ifndef DISABLE_PERFCOUNTERS
214 mono_perfcounters->gc_induced++;
220 * mono_gc_max_generation:
222 * Get the maximum generation number used by the current garbage
223 * collector. The value will be 0 for the Boehm collector, 1 or more
224 * for the generational collectors.
226 * Returns: the maximum generation number.
229 mono_gc_max_generation (void)
235 * mono_gc_get_generation:
236 * @object: a managed object
238 * Get the garbage collector's generation that @object belongs to.
239 * Use this has a hint only.
241 * Returns: a garbage collector generation number
244 mono_gc_get_generation (MonoObject *object)
250 * mono_gc_collection_count:
251 * @generation: a GC generation number
253 * Get how many times a garbage collection has been performed
254 * for the given @generation number.
256 * Returns: the number of garbage collections
259 mono_gc_collection_count (int generation)
265 * mono_gc_add_memory_pressure:
266 * @value: amount of bytes
268 * Adjust the garbage collector's view of how many bytes of memory
269 * are indirectly referenced by managed objects (for example unmanaged
270 * memory holding image or other binary data).
271 * This is a hint only to the garbage collector algorithm.
272 * Note that negative amounts of @value will decrease the memory
276 mono_gc_add_memory_pressure (gint64 value)
281 * mono_gc_get_used_size:
283 * Get the approximate amount of memory used by managed objects.
285 * Returns: the amount of memory used in bytes
288 mono_gc_get_used_size (void)
290 return GC_get_heap_size () - GC_get_free_bytes ();
294 * mono_gc_get_heap_size:
296 * Get the amount of memory used by the garbage collector.
298 * Returns: the size of the heap in bytes
301 mono_gc_get_heap_size (void)
303 return GC_get_heap_size ();
307 mono_gc_is_gc_thread (void)
309 #if GC_VERSION_MAJOR >= 7
311 #elif defined(USE_INCLUDED_LIBGC)
312 return GC_thread_is_registered ();
318 extern int GC_thread_register_foreign (void *base_addr);
321 mono_gc_register_thread (void *baseptr)
323 return mono_thread_info_attach (baseptr) != NULL;
327 boehm_thread_register (MonoThreadInfo* info, void *baseptr)
329 #if GC_VERSION_MAJOR >= 7
330 struct GC_stack_base sb;
333 res = GC_get_stack_base (&sb);
334 if (res != GC_SUCCESS) {
335 sb.mem_base = baseptr;
337 /* Can't determine the register stack bounds */
338 g_error ("mono_gc_register_thread failed ().\n");
341 res = GC_register_my_thread (&sb);
342 if ((res != GC_SUCCESS) && (res != GC_DUPLICATE)) {
343 g_warning ("GC_register_my_thread () failed.\n");
348 if (mono_gc_is_gc_thread())
350 #if defined(USE_INCLUDED_LIBGC) && !defined(HOST_WIN32)
351 return GC_thread_register_foreign (baseptr) ? info : NULL;
359 mono_object_is_alive (MonoObject* o)
361 #ifdef USE_INCLUDED_LIBGC
362 return GC_is_marked ((gpointer)o);
369 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
374 #ifdef USE_INCLUDED_LIBGC
376 static gint64 gc_start_time;
379 on_gc_notification (GCEventType event)
381 MonoGCEvent e = (MonoGCEvent)event;
384 case MONO_GC_EVENT_PRE_STOP_WORLD:
385 MONO_GC_WORLD_STOP_BEGIN ();
386 mono_thread_info_suspend_lock ();
389 case MONO_GC_EVENT_POST_STOP_WORLD:
390 MONO_GC_WORLD_STOP_END ();
393 case MONO_GC_EVENT_PRE_START_WORLD:
394 MONO_GC_WORLD_RESTART_BEGIN (1);
397 case MONO_GC_EVENT_POST_START_WORLD:
398 MONO_GC_WORLD_RESTART_END (1);
399 mono_thread_info_suspend_unlock ();
402 case MONO_GC_EVENT_START:
404 #ifndef DISABLE_PERFCOUNTERS
405 if (mono_perfcounters)
406 mono_perfcounters->gc_collections0++;
408 gc_stats.major_gc_count ++;
409 gc_start_time = mono_100ns_ticks ();
412 case MONO_GC_EVENT_END:
414 #if defined(ENABLE_DTRACE) && defined(__sun__)
415 /* This works around a dtrace -G problem on Solaris.
416 Limit its actual use to when the probe is enabled. */
417 if (MONO_GC_END_ENABLED ())
421 #ifndef DISABLE_PERFCOUNTERS
422 if (mono_perfcounters) {
423 guint64 heap_size = GC_get_heap_size ();
424 guint64 used_size = heap_size - GC_get_free_bytes ();
425 mono_perfcounters->gc_total_bytes = used_size;
426 mono_perfcounters->gc_committed_bytes = heap_size;
427 mono_perfcounters->gc_reserved_bytes = heap_size;
428 mono_perfcounters->gc_gen0size = heap_size;
431 gc_stats.major_gc_time_usecs += (mono_100ns_ticks () - gc_start_time) / 10;
432 mono_trace_message (MONO_TRACE_GC, "gc took %d usecs", (mono_100ns_ticks () - gc_start_time) / 10);
436 mono_profiler_gc_event (e, 0);
440 on_gc_heap_resize (size_t new_size)
442 guint64 heap_size = GC_get_heap_size ();
443 #ifndef DISABLE_PERFCOUNTERS
444 if (mono_perfcounters) {
445 mono_perfcounters->gc_committed_bytes = heap_size;
446 mono_perfcounters->gc_reserved_bytes = heap_size;
447 mono_perfcounters->gc_gen0size = heap_size;
450 mono_profiler_gc_heap_resize (new_size);
454 mono_gc_enable_events (void)
456 GC_notify_event = on_gc_notification;
457 GC_on_heap_resize = on_gc_heap_resize;
463 mono_gc_enable_events (void)
470 mono_gc_register_root (char *start, size_t size, void *descr)
472 /* for some strange reason, they want one extra byte on the end */
473 GC_add_roots (start, start + size + 1);
479 mono_gc_deregister_root (char* addr)
482 /* FIXME: libgc doesn't define this work win32 for some reason */
483 /* FIXME: No size info */
484 GC_remove_roots (addr, addr + sizeof (gpointer) + 1);
489 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
491 /* libgc requires that we use HIDE_POINTER... */
492 *link_addr = (void*)HIDE_POINTER (obj);
494 GC_REGISTER_LONG_LINK (link_addr, obj);
496 GC_GENERAL_REGISTER_DISAPPEARING_LINK (link_addr, obj);
500 mono_gc_weak_link_remove (void **link_addr, gboolean track)
503 GC_unregister_long_link (link_addr);
505 GC_unregister_disappearing_link (link_addr);
510 reveal_link (gpointer link_addr)
512 void **link_a = link_addr;
513 return REVEAL_POINTER (*link_a);
517 mono_gc_weak_link_get (void **link_addr)
519 MonoObject *obj = GC_call_with_alloc_lock (reveal_link, link_addr);
520 if (obj == (MonoObject *) -1)
526 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
528 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
532 mono_gc_make_descr_for_object (gsize *bitmap, int numbits, size_t obj_size)
534 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
538 mono_gc_make_descr_for_array (int vector, gsize *elem_bitmap, int numbits, size_t elem_size)
540 /* libgc has no usable support for arrays... */
541 return GC_NO_DESCRIPTOR;
545 mono_gc_make_descr_from_bitmap (gsize *bitmap, int numbits)
547 #ifdef HAVE_GC_GCJ_MALLOC
548 /* It seems there are issues when the bitmap doesn't fit: play it safe */
550 return GC_NO_DESCRIPTOR;
552 return (gpointer)GC_make_descriptor ((GC_bitmap)bitmap, numbits);
559 mono_gc_make_root_descr_all_refs (int numbits)
565 mono_gc_alloc_fixed (size_t size, void *descr)
567 /* To help track down typed allocation bugs */
571 if (count == atoi (g_getenv ("COUNT2")))
573 if (count > atoi (g_getenv ("COUNT2")))
574 return GC_MALLOC (size);
578 return GC_MALLOC_EXPLICITLY_TYPED (size, (GC_descr)descr);
580 return GC_MALLOC (size);
584 mono_gc_free_fixed (void* addr)
589 mono_gc_invoke_finalizers (void)
591 /* There is a bug in GC_invoke_finalizer () in versions <= 6.2alpha4:
592 * the 'mem_freed' variable is not initialized when there are no
593 * objects to finalize, which leads to strange behavior later on.
594 * The check is necessary to work around that bug.
596 if (GC_should_invoke_finalizers ())
597 return GC_invoke_finalizers ();
602 mono_gc_pending_finalizers (void)
604 return GC_should_invoke_finalizers ();
608 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
610 *(void**)field_ptr = value;
614 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
616 *(void**)slot_ptr = value;
620 mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
622 mono_gc_memmove (dest_ptr, src_ptr, count * sizeof (gpointer));
626 mono_gc_wbarrier_generic_store (gpointer ptr, MonoObject* value)
628 *(void**)ptr = value;
632 mono_gc_wbarrier_generic_store_atomic (gpointer ptr, MonoObject *value)
634 InterlockedWritePointer (ptr, value);
638 mono_gc_wbarrier_generic_nostore (gpointer ptr)
643 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
645 mono_gc_memmove (dest, src, count * mono_class_value_size (klass, NULL));
649 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
651 /* do not copy the sync state */
652 mono_gc_memmove ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
653 mono_object_class (obj)->instance_size - sizeof (MonoObject));
657 mono_gc_clear_domain (MonoDomain *domain)
662 mono_gc_get_suspend_signal (void)
664 #ifdef USE_INCLUDED_GC
665 return GC_get_suspend_signal ();
671 #if defined(USE_INCLUDED_LIBGC) && defined(USE_COMPILER_TLS) && defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
672 extern __thread MONO_TLS_FAST void* GC_thread_tls;
673 #include "metadata-internals.h"
679 while (!(v & (1 << i)))
686 ATYPE_FREEPTR_FOR_BOX,
694 create_allocator (int atype, int tls_key)
696 int index_var, bytes_var, my_fl_var, my_entry_var;
697 guint32 no_freelist_branch, not_small_enough_branch = 0;
698 guint32 size_overflow_branch = 0;
699 MonoMethodBuilder *mb;
701 MonoMethodSignature *csig;
702 AllocatorWrapperInfo *info;
704 if (atype == ATYPE_STRING) {
705 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
706 csig->ret = &mono_defaults.string_class->byval_arg;
707 csig->params [0] = &mono_defaults.int_class->byval_arg;
708 csig->params [1] = &mono_defaults.int32_class->byval_arg;
710 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
711 csig->ret = &mono_defaults.object_class->byval_arg;
712 csig->params [0] = &mono_defaults.int_class->byval_arg;
715 mb = mono_mb_new (mono_defaults.object_class, "Alloc", MONO_WRAPPER_ALLOC);
716 bytes_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
717 if (atype == ATYPE_STRING) {
718 /* a string alloator method takes the args: (vtable, len) */
719 /* bytes = (sizeof (MonoString) + ((len + 1) * 2)); */
720 mono_mb_emit_ldarg (mb, 1);
721 mono_mb_emit_icon (mb, 1);
722 mono_mb_emit_byte (mb, MONO_CEE_ADD);
723 mono_mb_emit_icon (mb, 1);
724 mono_mb_emit_byte (mb, MONO_CEE_SHL);
725 // sizeof (MonoString) might include padding
726 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, chars));
727 mono_mb_emit_byte (mb, MONO_CEE_ADD);
728 mono_mb_emit_stloc (mb, bytes_var);
730 /* bytes = vtable->klass->instance_size */
731 mono_mb_emit_ldarg (mb, 0);
732 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoVTable, klass));
733 mono_mb_emit_byte (mb, MONO_CEE_ADD);
734 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
735 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoClass, instance_size));
736 mono_mb_emit_byte (mb, MONO_CEE_ADD);
737 /* FIXME: assert instance_size stays a 4 byte integer */
738 mono_mb_emit_byte (mb, MONO_CEE_LDIND_U4);
739 mono_mb_emit_stloc (mb, bytes_var);
742 /* this is needed for strings/arrays only as the other big types are never allocated with this method */
743 if (atype == ATYPE_STRING) {
745 /* if (!SMALL_ENOUGH (bytes)) jump slow_path;*/
746 mono_mb_emit_ldloc (mb, bytes_var);
747 mono_mb_emit_icon (mb, (NFREELISTS-1) * GRANULARITY);
748 not_small_enough_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
749 /* check for overflow */
750 mono_mb_emit_ldloc (mb, bytes_var);
751 mono_mb_emit_icon (mb, sizeof (MonoString));
752 size_overflow_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
755 /* int index = INDEX_FROM_BYTES(bytes); */
756 index_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
758 mono_mb_emit_ldloc (mb, bytes_var);
759 mono_mb_emit_icon (mb, GRANULARITY - 1);
760 mono_mb_emit_byte (mb, MONO_CEE_ADD);
761 mono_mb_emit_icon (mb, shift_amount (GRANULARITY));
762 mono_mb_emit_byte (mb, MONO_CEE_SHR_UN);
763 mono_mb_emit_icon (mb, shift_amount (sizeof (gpointer)));
764 mono_mb_emit_byte (mb, MONO_CEE_SHL);
765 /* index var is already adjusted into bytes */
766 mono_mb_emit_stloc (mb, index_var);
768 my_fl_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
769 my_entry_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
770 /* my_fl = ((GC_thread)tsd) -> ptrfree_freelists + index; */
771 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
772 mono_mb_emit_byte (mb, 0x0D); /* CEE_MONO_TLS */
773 mono_mb_emit_i4 (mb, tls_key);
774 if (atype == ATYPE_FREEPTR || atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING)
775 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, ptrfree_freelists));
776 else if (atype == ATYPE_NORMAL)
777 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, normal_freelists));
778 else if (atype == ATYPE_GCJ)
779 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, gcj_freelists));
781 g_assert_not_reached ();
782 mono_mb_emit_byte (mb, MONO_CEE_ADD);
783 mono_mb_emit_ldloc (mb, index_var);
784 mono_mb_emit_byte (mb, MONO_CEE_ADD);
785 mono_mb_emit_stloc (mb, my_fl_var);
787 /* my_entry = *my_fl; */
788 mono_mb_emit_ldloc (mb, my_fl_var);
789 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
790 mono_mb_emit_stloc (mb, my_entry_var);
792 /* if (EXPECT((word)my_entry >= HBLKSIZE, 1)) { */
793 mono_mb_emit_ldloc (mb, my_entry_var);
794 mono_mb_emit_icon (mb, HBLKSIZE);
795 no_freelist_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
797 /* ptr_t next = obj_link(my_entry); *my_fl = next; */
798 mono_mb_emit_ldloc (mb, my_fl_var);
799 mono_mb_emit_ldloc (mb, my_entry_var);
800 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
801 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
803 /* set the vtable and clear the words in the object */
804 mono_mb_emit_ldloc (mb, my_entry_var);
805 mono_mb_emit_ldarg (mb, 0);
806 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
808 if (atype == ATYPE_FREEPTR) {
809 int start_var, end_var, start_loop;
810 /* end = my_entry + bytes; start = my_entry + sizeof (gpointer);
812 start_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
813 end_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
814 mono_mb_emit_ldloc (mb, my_entry_var);
815 mono_mb_emit_ldloc (mb, bytes_var);
816 mono_mb_emit_byte (mb, MONO_CEE_ADD);
817 mono_mb_emit_stloc (mb, end_var);
818 mono_mb_emit_ldloc (mb, my_entry_var);
819 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
820 mono_mb_emit_byte (mb, MONO_CEE_ADD);
821 mono_mb_emit_stloc (mb, start_var);
825 * } while (start < end);
827 start_loop = mono_mb_get_label (mb);
828 mono_mb_emit_ldloc (mb, start_var);
829 mono_mb_emit_icon (mb, 0);
830 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
831 mono_mb_emit_ldloc (mb, start_var);
832 mono_mb_emit_icon (mb, sizeof (gpointer));
833 mono_mb_emit_byte (mb, MONO_CEE_ADD);
834 mono_mb_emit_stloc (mb, start_var);
836 mono_mb_emit_ldloc (mb, start_var);
837 mono_mb_emit_ldloc (mb, end_var);
838 mono_mb_emit_byte (mb, MONO_CEE_BLT_UN_S);
839 mono_mb_emit_byte (mb, start_loop - (mono_mb_get_label (mb) + 1));
840 } else if (atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING) {
841 /* need to clear just the sync pointer */
842 mono_mb_emit_ldloc (mb, my_entry_var);
843 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
844 mono_mb_emit_byte (mb, MONO_CEE_ADD);
845 mono_mb_emit_icon (mb, 0);
846 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
849 if (atype == ATYPE_STRING) {
850 /* need to set length and clear the last char */
851 /* s->length = len; */
852 mono_mb_emit_ldloc (mb, my_entry_var);
853 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, length));
854 mono_mb_emit_byte (mb, MONO_CEE_ADD);
855 mono_mb_emit_ldarg (mb, 1);
856 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
857 /* s->chars [len] = 0; */
858 mono_mb_emit_ldloc (mb, my_entry_var);
859 mono_mb_emit_ldloc (mb, bytes_var);
860 mono_mb_emit_icon (mb, 2);
861 mono_mb_emit_byte (mb, MONO_CEE_SUB);
862 mono_mb_emit_byte (mb, MONO_CEE_ADD);
863 mono_mb_emit_icon (mb, 0);
864 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
867 /* return my_entry; */
868 mono_mb_emit_ldloc (mb, my_entry_var);
869 mono_mb_emit_byte (mb, MONO_CEE_RET);
871 mono_mb_patch_short_branch (mb, no_freelist_branch);
872 if (not_small_enough_branch > 0)
873 mono_mb_patch_short_branch (mb, not_small_enough_branch);
874 if (size_overflow_branch > 0)
875 mono_mb_patch_short_branch (mb, size_overflow_branch);
876 /* the slow path: we just call back into the runtime */
877 if (atype == ATYPE_STRING) {
878 mono_mb_emit_ldarg (mb, 1);
879 mono_mb_emit_icall (mb, mono_string_alloc);
881 mono_mb_emit_ldarg (mb, 0);
882 mono_mb_emit_icall (mb, mono_object_new_specific);
885 mono_mb_emit_byte (mb, MONO_CEE_RET);
887 res = mono_mb_create_method (mb, csig, 8);
889 mono_method_get_header (res)->init_locals = FALSE;
891 info = mono_image_alloc0 (mono_defaults.corlib, sizeof (AllocatorWrapperInfo));
892 info->gc_name = "boehm";
893 info->alloc_type = atype;
894 mono_marshal_set_wrapper_info (res, info);
899 static MonoMethod* alloc_method_cache [ATYPE_NUM];
901 static G_GNUC_UNUSED gboolean
902 mono_gc_is_critical_method (MonoMethod *method)
906 for (i = 0; i < ATYPE_NUM; ++i)
907 if (method == alloc_method_cache [i])
914 * If possible, generate a managed method that can quickly allocate objects in class
915 * @klass. The method will typically have an thread-local inline allocation sequence.
916 * The signature of the called method is:
917 * object allocate (MonoVTable *vtable)
918 * Some of the logic here is similar to mono_class_get_allocation_ftn () i object.c,
920 * The thread local alloc logic is taken from libgc/pthread_support.c.
924 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box)
928 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
930 /*g_print ("thread tls: %d\n", offset);*/
933 if (!SMALL_ENOUGH (klass->instance_size))
935 if (mono_class_has_finalizer (klass) || mono_class_is_marshalbyref (klass) || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
939 if (mono_class_is_open_constructed_type (&klass->byval_arg))
941 if (klass->byval_arg.type == MONO_TYPE_STRING) {
942 atype = ATYPE_STRING;
943 } else if (!klass->has_references) {
945 atype = ATYPE_FREEPTR_FOR_BOX;
947 atype = ATYPE_FREEPTR;
951 * disabled because we currently do a runtime choice anyway, to
952 * deal with multiple appdomains.
953 if (vtable->gc_descr != GC_NO_DESCRIPTOR)
956 atype = ATYPE_NORMAL;
959 return mono_gc_get_managed_allocator_by_type (atype);
963 mono_gc_get_managed_array_allocator (MonoClass *klass)
969 * mono_gc_get_managed_allocator_by_type:
971 * Return a managed allocator method corresponding to allocator type ATYPE.
974 mono_gc_get_managed_allocator_by_type (int atype)
978 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
980 mono_tls_key_set_offset (TLS_KEY_BOEHM_GC_THREAD, offset);
982 res = alloc_method_cache [atype];
986 res = create_allocator (atype, TLS_KEY_BOEHM_GC_THREAD);
987 mono_mutex_lock (&mono_gc_lock);
988 if (alloc_method_cache [atype]) {
989 mono_free_method (res);
990 res = alloc_method_cache [atype]
992 mono_memory_barrier ();
993 alloc_method_cache [atype] = res;
995 mono_mutex_unlock (&mono_gc_lock);
1000 mono_gc_get_managed_allocator_types (void)
1006 mono_gc_get_write_barrier (void)
1008 g_assert_not_reached ();
1014 static G_GNUC_UNUSED gboolean
1015 mono_gc_is_critical_method (MonoMethod *method)
1021 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box)
1027 mono_gc_get_managed_array_allocator (MonoClass *klass)
1033 mono_gc_get_managed_allocator_by_type (int atype)
1039 mono_gc_get_managed_allocator_types (void)
1045 mono_gc_get_write_barrier (void)
1047 g_assert_not_reached ();
1054 mono_gc_get_gc_name (void)
1060 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
1062 return GC_call_with_alloc_lock (func, data);
1066 mono_gc_get_description (void)
1068 return g_strdup (DEFAULT_GC_NAME);
1072 mono_gc_set_desktop_mode (void)
1078 mono_gc_is_moving (void)
1084 mono_gc_is_disabled (void)
1086 if (GC_dont_gc || g_getenv ("GC_DONT_GC"))
1093 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
1095 g_assert_not_reached ();
1100 mono_gc_get_card_table (int *shift_bits, gpointer *card_mask)
1102 g_assert_not_reached ();
1107 mono_gc_card_table_nursery_check (void)
1109 g_assert_not_reached ();
1114 mono_gc_get_nursery (int *shift_bits, size_t *size)
1120 mono_gc_set_current_thread_appdomain (MonoDomain *domain)
1125 mono_gc_precise_stack_mark_enabled (void)
1131 mono_gc_get_logfile (void)
1137 mono_gc_conservatively_scan_area (void *start, void *end)
1139 g_assert_not_reached ();
1143 mono_gc_scan_object (void *obj)
1145 g_assert_not_reached ();
1150 mono_gc_get_bitmap_for_descr (void *descr, int *numbits)
1152 g_assert_not_reached ();
1157 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
1162 mono_gc_set_stack_end (void *stack_end)
1166 void mono_gc_set_skip_thread (gboolean value)
1171 mono_gc_register_for_finalization (MonoObject *obj, void *user_data)
1176 /* This assertion is not valid when GC_DEBUG is defined */
1177 g_assert (GC_base (obj) == (char*)obj - offset);
1180 GC_REGISTER_FINALIZER_NO_ORDER ((char*)obj - offset, user_data, GUINT_TO_POINTER (offset), NULL, NULL);
1184 * These will call the redefined versions in libgc.
1190 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
1192 return pthread_create (new_thread, attr, start_routine, arg);
1196 mono_gc_pthread_join (pthread_t thread, void **retval)
1198 return pthread_join (thread, retval);
1202 mono_gc_pthread_detach (pthread_t thread)
1204 return pthread_detach (thread);
1208 mono_gc_pthread_exit (void *retval)
1210 pthread_exit (retval);
1216 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
1218 #ifdef USE_INCLUDED_LIBGC
1219 return GC_DllMain (module_handle, reason, reserved);
1227 mono_gc_get_vtable_bits (MonoClass *class)
1233 * mono_gc_register_altstack:
1235 * Register the dimensions of the normal stack and altstack with the collector.
1236 * Currently, STACK/STACK_SIZE is only used when the thread is suspended while it is on an altstack.
1239 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
1241 #ifdef USE_INCLUDED_LIBGC
1242 GC_register_altstack (stack, stack_size, altstack, altstack_size);
1247 mono_gc_get_los_limit (void)
1253 mono_gc_user_markers_supported (void)
1259 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
1261 g_assert_not_reached ();
1266 mono_gc_set_allow_synchronous_major (gboolean flag)
1271 #endif /* no Boehm GC */