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/metadata/sgen-toggleref.h>
25 #include <mono/utils/atomic.h>
26 #include <mono/utils/mono-logger-internal.h>
27 #include <mono/utils/mono-memory-model.h>
28 #include <mono/utils/mono-time.h>
29 #include <mono/utils/mono-threads.h>
30 #include <mono/utils/dtrace.h>
31 #include <mono/utils/gc_wrapper.h>
32 #include <mono/utils/mono-mutex.h>
36 #ifdef USE_INCLUDED_LIBGC
39 #define THREAD_LOCAL_ALLOC 1
40 #include "private/pthread_support.h"
43 #if defined(PLATFORM_MACOSX) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
44 void *pthread_get_stackaddr_np(pthread_t);
47 #define GC_NO_DESCRIPTOR ((gpointer)(0 | GC_DS_LENGTH))
48 /*Boehm max heap cannot be smaller than 16MB*/
49 #define MIN_BOEHM_MAX_HEAP_SIZE_IN_MB 16
50 #define MIN_BOEHM_MAX_HEAP_SIZE (MIN_BOEHM_MAX_HEAP_SIZE_IN_MB << 20)
52 static gboolean gc_initialized = FALSE;
53 static mono_mutex_t mono_gc_lock;
56 boehm_thread_register (MonoThreadInfo* info, void *baseptr);
58 boehm_thread_unregister (MonoThreadInfo *p);
60 register_test_toggleref_callback (void);
62 #define BOEHM_GC_BIT_FINALIZER_AWARE 1
63 static MonoGCFinalizerCallbacks fin_callbacks;
66 mono_gc_warning (char *msg, GC_word arg)
68 mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_GC, msg, (unsigned long)arg);
72 mono_gc_base_init (void)
74 MonoThreadInfoCallbacks cb;
82 * Handle the case when we are called from a thread different from the main thread,
84 * FIXME: Move this to libgc where it belongs.
86 * we used to do this only when running on valgrind,
87 * but it happens also in other setups.
89 #if defined(HAVE_PTHREAD_GETATTR_NP) && defined(HAVE_PTHREAD_ATTR_GETSTACK) && !defined(__native_client__)
94 pthread_getattr_np (pthread_self (), &attr);
95 pthread_attr_getstack (&attr, &sstart, &size);
96 pthread_attr_destroy (&attr);
97 /*g_print ("stackbottom pth is: %p\n", (char*)sstart + size);*/
100 * The calculation above doesn't seem to work on ia64, also we need to set
101 * GC_register_stackbottom as well, but don't know how.
104 /* apparently with some linuxthreads implementations sstart can be NULL,
105 * fallback to the more imprecise method (bug# 78096).
108 GC_stackbottom = (char*)sstart + size;
111 gsize stack_bottom = (gsize)&dummy;
112 stack_bottom += 4095;
113 stack_bottom &= ~4095;
114 GC_stackbottom = (char*)stack_bottom;
118 #elif defined(HAVE_PTHREAD_GET_STACKSIZE_NP) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
119 GC_stackbottom = (char*)pthread_get_stackaddr_np (pthread_self ());
120 #elif defined(__OpenBSD__)
121 # include <pthread_np.h>
126 rslt = pthread_stackseg_np(pthread_self(), &ss);
127 g_assert (rslt == 0);
129 GC_stackbottom = (char*)ss.ss_sp;
131 #elif defined(__native_client__)
132 /* Do nothing, GC_stackbottom is set correctly in libgc */
136 gsize stack_bottom = (gsize)&dummy;
137 stack_bottom += 4095;
138 stack_bottom &= ~4095;
139 /*g_print ("stackbottom is: %p\n", (char*)stack_bottom);*/
140 GC_stackbottom = (char*)stack_bottom;
144 #if !defined(PLATFORM_ANDROID)
145 /* If GC_no_dls is set to true, GC_find_limit is not called. This causes a seg fault on Android. */
149 GC_oom_fn = mono_gc_out_of_memory;
150 GC_set_warn_proc (mono_gc_warning);
151 GC_finalize_on_demand = 1;
152 GC_finalizer_notifier = mono_gc_finalize_notify;
154 #ifdef HAVE_GC_GCJ_MALLOC
155 GC_init_gcj_malloc (5, NULL);
158 #ifdef HAVE_GC_ALLOW_REGISTER_THREADS
159 GC_allow_register_threads();
162 if ((env = g_getenv ("MONO_GC_PARAMS"))) {
163 char **ptr, **opts = g_strsplit (env, ",", -1);
164 for (ptr = opts; *ptr; ++ptr) {
166 if (g_str_has_prefix (opt, "max-heap-size=")) {
169 opt = strchr (opt, '=') + 1;
170 if (*opt && mono_gc_parse_environment_string_extract_number (opt, &max_heap)) {
171 if (max_heap < MIN_BOEHM_MAX_HEAP_SIZE) {
172 fprintf (stderr, "max-heap-size must be at least %dMb.\n", MIN_BOEHM_MAX_HEAP_SIZE_IN_MB);
175 GC_set_max_heap_size (max_heap);
177 fprintf (stderr, "max-heap-size must be an integer.\n");
181 } else if (g_str_has_prefix (opt, "toggleref-test")) {
182 register_test_toggleref_callback ();
185 /* Could be a parameter for sgen */
187 fprintf (stderr, "MONO_GC_PARAMS must be a comma-delimited list of one or more of the following:\n");
188 fprintf (stderr, " max-heap-size=N (where N is an integer, possibly with a k, m or a g suffix)\n");
196 memset (&cb, 0, sizeof (cb));
197 cb.thread_register = boehm_thread_register;
198 cb.thread_unregister = boehm_thread_unregister;
199 cb.mono_method_is_critical = (gpointer)mono_runtime_is_critical_method;
201 cb.thread_exit = mono_gc_pthread_exit;
202 cb.mono_gc_pthread_create = (gpointer)mono_gc_pthread_create;
205 mono_threads_init (&cb, sizeof (MonoThreadInfo));
206 mono_mutex_init (&mono_gc_lock);
208 mono_thread_info_attach (&dummy);
210 mono_gc_enable_events ();
211 gc_initialized = TRUE;
216 * @generation: GC generation identifier
218 * Perform a garbage collection for the given generation, higher numbers
219 * mean usually older objects. Collecting a high-numbered generation
220 * implies collecting also the lower-numbered generations.
221 * The maximum value for @generation can be retrieved with a call to
222 * mono_gc_max_generation(), so this function is usually called as:
224 * mono_gc_collect (mono_gc_max_generation ());
227 mono_gc_collect (int generation)
229 #ifndef DISABLE_PERFCOUNTERS
230 mono_perfcounters->gc_induced++;
236 * mono_gc_max_generation:
238 * Get the maximum generation number used by the current garbage
239 * collector. The value will be 0 for the Boehm collector, 1 or more
240 * for the generational collectors.
242 * Returns: the maximum generation number.
245 mono_gc_max_generation (void)
251 * mono_gc_get_generation:
252 * @object: a managed object
254 * Get the garbage collector's generation that @object belongs to.
255 * Use this has a hint only.
257 * Returns: a garbage collector generation number
260 mono_gc_get_generation (MonoObject *object)
266 * mono_gc_collection_count:
267 * @generation: a GC generation number
269 * Get how many times a garbage collection has been performed
270 * for the given @generation number.
272 * Returns: the number of garbage collections
275 mono_gc_collection_count (int generation)
281 * mono_gc_add_memory_pressure:
282 * @value: amount of bytes
284 * Adjust the garbage collector's view of how many bytes of memory
285 * are indirectly referenced by managed objects (for example unmanaged
286 * memory holding image or other binary data).
287 * This is a hint only to the garbage collector algorithm.
288 * Note that negative amounts of @value will decrease the memory
292 mono_gc_add_memory_pressure (gint64 value)
297 * mono_gc_get_used_size:
299 * Get the approximate amount of memory used by managed objects.
301 * Returns: the amount of memory used in bytes
304 mono_gc_get_used_size (void)
306 return GC_get_heap_size () - GC_get_free_bytes ();
310 * mono_gc_get_heap_size:
312 * Get the amount of memory used by the garbage collector.
314 * Returns: the size of the heap in bytes
317 mono_gc_get_heap_size (void)
319 return GC_get_heap_size ();
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 boehm_thread_unregister (MonoThreadInfo *p)
377 MonoNativeThreadId tid;
379 tid = mono_thread_info_get_tid (p);
381 if (p->runtime_thread)
382 mono_threads_add_joinable_thread ((gpointer)tid);
386 mono_object_is_alive (MonoObject* o)
388 #ifdef USE_INCLUDED_LIBGC
389 return GC_is_marked ((gpointer)o);
396 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
401 #ifdef USE_INCLUDED_LIBGC
403 static gint64 gc_start_time;
406 on_gc_notification (GCEventType event)
408 MonoGCEvent e = (MonoGCEvent)event;
411 case MONO_GC_EVENT_PRE_STOP_WORLD:
412 MONO_GC_WORLD_STOP_BEGIN ();
413 mono_thread_info_suspend_lock ();
416 case MONO_GC_EVENT_POST_STOP_WORLD:
417 MONO_GC_WORLD_STOP_END ();
420 case MONO_GC_EVENT_PRE_START_WORLD:
421 MONO_GC_WORLD_RESTART_BEGIN (1);
424 case MONO_GC_EVENT_POST_START_WORLD:
425 MONO_GC_WORLD_RESTART_END (1);
426 mono_thread_info_suspend_unlock ();
429 case MONO_GC_EVENT_START:
431 #ifndef DISABLE_PERFCOUNTERS
432 if (mono_perfcounters)
433 mono_perfcounters->gc_collections0++;
435 gc_stats.major_gc_count ++;
436 gc_start_time = mono_100ns_ticks ();
439 case MONO_GC_EVENT_END:
441 #if defined(ENABLE_DTRACE) && defined(__sun__)
442 /* This works around a dtrace -G problem on Solaris.
443 Limit its actual use to when the probe is enabled. */
444 if (MONO_GC_END_ENABLED ())
448 #ifndef DISABLE_PERFCOUNTERS
449 if (mono_perfcounters) {
450 guint64 heap_size = GC_get_heap_size ();
451 guint64 used_size = heap_size - GC_get_free_bytes ();
452 mono_perfcounters->gc_total_bytes = used_size;
453 mono_perfcounters->gc_committed_bytes = heap_size;
454 mono_perfcounters->gc_reserved_bytes = heap_size;
455 mono_perfcounters->gc_gen0size = heap_size;
458 gc_stats.major_gc_time += mono_100ns_ticks () - gc_start_time;
459 mono_trace_message (MONO_TRACE_GC, "gc took %d usecs", (mono_100ns_ticks () - gc_start_time) / 10);
463 mono_profiler_gc_event (e, 0);
467 on_gc_heap_resize (size_t new_size)
469 guint64 heap_size = GC_get_heap_size ();
470 #ifndef DISABLE_PERFCOUNTERS
471 if (mono_perfcounters) {
472 mono_perfcounters->gc_committed_bytes = heap_size;
473 mono_perfcounters->gc_reserved_bytes = heap_size;
474 mono_perfcounters->gc_gen0size = heap_size;
477 mono_profiler_gc_heap_resize (new_size);
481 mono_gc_enable_events (void)
483 GC_notify_event = on_gc_notification;
484 GC_on_heap_resize = on_gc_heap_resize;
490 mono_gc_enable_events (void)
497 mono_gc_register_root (char *start, size_t size, void *descr)
499 /* for some strange reason, they want one extra byte on the end */
500 GC_add_roots (start, start + size + 1);
506 mono_gc_deregister_root (char* addr)
509 /* FIXME: libgc doesn't define this work win32 for some reason */
510 /* FIXME: No size info */
511 GC_remove_roots (addr, addr + sizeof (gpointer) + 1);
516 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
518 /* libgc requires that we use HIDE_POINTER... */
519 *link_addr = (void*)HIDE_POINTER (obj);
521 GC_REGISTER_LONG_LINK (link_addr, obj);
523 GC_GENERAL_REGISTER_DISAPPEARING_LINK (link_addr, obj);
527 mono_gc_weak_link_remove (void **link_addr, gboolean track)
530 GC_unregister_long_link (link_addr);
532 GC_unregister_disappearing_link (link_addr);
537 reveal_link (gpointer link_addr)
539 void **link_a = link_addr;
540 return REVEAL_POINTER (*link_a);
544 mono_gc_weak_link_get (void **link_addr)
546 MonoObject *obj = GC_call_with_alloc_lock (reveal_link, link_addr);
547 if (obj == (MonoObject *) -1)
553 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
555 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
559 mono_gc_make_descr_for_object (gsize *bitmap, int numbits, size_t obj_size)
561 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
565 mono_gc_make_descr_for_array (int vector, gsize *elem_bitmap, int numbits, size_t elem_size)
567 /* libgc has no usable support for arrays... */
568 return GC_NO_DESCRIPTOR;
572 mono_gc_make_descr_from_bitmap (gsize *bitmap, int numbits)
574 #ifdef HAVE_GC_GCJ_MALLOC
575 /* It seems there are issues when the bitmap doesn't fit: play it safe */
577 return GC_NO_DESCRIPTOR;
579 return (gpointer)GC_make_descriptor ((GC_bitmap)bitmap, numbits);
586 mono_gc_make_root_descr_all_refs (int numbits)
592 mono_gc_alloc_fixed (size_t size, void *descr)
594 /* To help track down typed allocation bugs */
598 if (count == atoi (g_getenv ("COUNT2")))
600 if (count > atoi (g_getenv ("COUNT2")))
601 return GC_MALLOC (size);
605 return GC_MALLOC_EXPLICITLY_TYPED (size, (GC_descr)descr);
607 return GC_MALLOC (size);
611 mono_gc_free_fixed (void* addr)
616 mono_gc_invoke_finalizers (void)
618 /* There is a bug in GC_invoke_finalizer () in versions <= 6.2alpha4:
619 * the 'mem_freed' variable is not initialized when there are no
620 * objects to finalize, which leads to strange behavior later on.
621 * The check is necessary to work around that bug.
623 if (GC_should_invoke_finalizers ())
624 return GC_invoke_finalizers ();
629 mono_gc_pending_finalizers (void)
631 return GC_should_invoke_finalizers ();
635 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
637 *(void**)field_ptr = value;
641 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
643 *(void**)slot_ptr = value;
647 mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
649 mono_gc_memmove_aligned (dest_ptr, src_ptr, count * sizeof (gpointer));
653 mono_gc_wbarrier_generic_store (gpointer ptr, MonoObject* value)
655 *(void**)ptr = value;
659 mono_gc_wbarrier_generic_store_atomic (gpointer ptr, MonoObject *value)
661 InterlockedWritePointer (ptr, value);
665 mono_gc_wbarrier_generic_nostore (gpointer ptr)
670 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
672 mono_gc_memmove_atomic (dest, src, count * mono_class_value_size (klass, NULL));
676 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
678 /* do not copy the sync state */
679 mono_gc_memmove_aligned ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
680 mono_object_class (obj)->instance_size - sizeof (MonoObject));
684 mono_gc_clear_domain (MonoDomain *domain)
689 mono_gc_get_suspend_signal (void)
691 #ifdef USE_INCLUDED_GC
692 return GC_get_suspend_signal ();
699 mono_gc_get_restart_signal (void)
701 #ifdef USE_INCLUDED_GC
702 return GC_get_restart_signal ();
708 #if defined(USE_INCLUDED_LIBGC) && defined(USE_COMPILER_TLS) && defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
709 extern __thread MONO_TLS_FAST void* GC_thread_tls;
710 #include "metadata-internals.h"
716 while (!(v & (1 << i)))
723 ATYPE_FREEPTR_FOR_BOX,
731 create_allocator (int atype, int tls_key)
733 int index_var, bytes_var, my_fl_var, my_entry_var;
734 guint32 no_freelist_branch, not_small_enough_branch = 0;
735 guint32 size_overflow_branch = 0;
736 MonoMethodBuilder *mb;
738 MonoMethodSignature *csig;
739 AllocatorWrapperInfo *info;
741 if (atype == ATYPE_STRING) {
742 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
743 csig->ret = &mono_defaults.string_class->byval_arg;
744 csig->params [0] = &mono_defaults.int_class->byval_arg;
745 csig->params [1] = &mono_defaults.int32_class->byval_arg;
747 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
748 csig->ret = &mono_defaults.object_class->byval_arg;
749 csig->params [0] = &mono_defaults.int_class->byval_arg;
752 mb = mono_mb_new (mono_defaults.object_class, "Alloc", MONO_WRAPPER_ALLOC);
753 bytes_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
754 if (atype == ATYPE_STRING) {
755 /* a string alloator method takes the args: (vtable, len) */
756 /* bytes = (offsetof (MonoString, chars) + ((len + 1) * 2)); */
757 mono_mb_emit_ldarg (mb, 1);
758 mono_mb_emit_icon (mb, 1);
759 mono_mb_emit_byte (mb, MONO_CEE_ADD);
760 mono_mb_emit_icon (mb, 1);
761 mono_mb_emit_byte (mb, MONO_CEE_SHL);
762 // sizeof (MonoString) might include padding
763 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, chars));
764 mono_mb_emit_byte (mb, MONO_CEE_ADD);
765 mono_mb_emit_stloc (mb, bytes_var);
767 /* bytes = vtable->klass->instance_size */
768 mono_mb_emit_ldarg (mb, 0);
769 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoVTable, klass));
770 mono_mb_emit_byte (mb, MONO_CEE_ADD);
771 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
772 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoClass, instance_size));
773 mono_mb_emit_byte (mb, MONO_CEE_ADD);
774 /* FIXME: assert instance_size stays a 4 byte integer */
775 mono_mb_emit_byte (mb, MONO_CEE_LDIND_U4);
776 mono_mb_emit_stloc (mb, bytes_var);
779 /* this is needed for strings/arrays only as the other big types are never allocated with this method */
780 if (atype == ATYPE_STRING) {
782 /* if (!SMALL_ENOUGH (bytes)) jump slow_path;*/
783 mono_mb_emit_ldloc (mb, bytes_var);
784 mono_mb_emit_icon (mb, (NFREELISTS-1) * GRANULARITY);
785 not_small_enough_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
786 /* check for overflow */
787 mono_mb_emit_ldloc (mb, bytes_var);
788 mono_mb_emit_icon (mb, sizeof (MonoString));
789 size_overflow_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
792 /* int index = INDEX_FROM_BYTES(bytes); */
793 index_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
795 mono_mb_emit_ldloc (mb, bytes_var);
796 mono_mb_emit_icon (mb, GRANULARITY - 1);
797 mono_mb_emit_byte (mb, MONO_CEE_ADD);
798 mono_mb_emit_icon (mb, shift_amount (GRANULARITY));
799 mono_mb_emit_byte (mb, MONO_CEE_SHR_UN);
800 mono_mb_emit_icon (mb, shift_amount (sizeof (gpointer)));
801 mono_mb_emit_byte (mb, MONO_CEE_SHL);
802 /* index var is already adjusted into bytes */
803 mono_mb_emit_stloc (mb, index_var);
805 my_fl_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
806 my_entry_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
807 /* my_fl = ((GC_thread)tsd) -> ptrfree_freelists + index; */
808 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
809 mono_mb_emit_byte (mb, 0x0D); /* CEE_MONO_TLS */
810 mono_mb_emit_i4 (mb, tls_key);
811 if (atype == ATYPE_FREEPTR || atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING)
812 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, ptrfree_freelists));
813 else if (atype == ATYPE_NORMAL)
814 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, normal_freelists));
815 else if (atype == ATYPE_GCJ)
816 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, gcj_freelists));
818 g_assert_not_reached ();
819 mono_mb_emit_byte (mb, MONO_CEE_ADD);
820 mono_mb_emit_ldloc (mb, index_var);
821 mono_mb_emit_byte (mb, MONO_CEE_ADD);
822 mono_mb_emit_stloc (mb, my_fl_var);
824 /* my_entry = *my_fl; */
825 mono_mb_emit_ldloc (mb, my_fl_var);
826 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
827 mono_mb_emit_stloc (mb, my_entry_var);
829 /* if (EXPECT((word)my_entry >= HBLKSIZE, 1)) { */
830 mono_mb_emit_ldloc (mb, my_entry_var);
831 mono_mb_emit_icon (mb, HBLKSIZE);
832 no_freelist_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
834 /* ptr_t next = obj_link(my_entry); *my_fl = next; */
835 mono_mb_emit_ldloc (mb, my_fl_var);
836 mono_mb_emit_ldloc (mb, my_entry_var);
837 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
838 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
840 /* set the vtable and clear the words in the object */
841 mono_mb_emit_ldloc (mb, my_entry_var);
842 mono_mb_emit_ldarg (mb, 0);
843 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
845 if (atype == ATYPE_FREEPTR) {
846 int start_var, end_var, start_loop;
847 /* end = my_entry + bytes; start = my_entry + sizeof (gpointer);
849 start_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
850 end_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
851 mono_mb_emit_ldloc (mb, my_entry_var);
852 mono_mb_emit_ldloc (mb, bytes_var);
853 mono_mb_emit_byte (mb, MONO_CEE_ADD);
854 mono_mb_emit_stloc (mb, end_var);
855 mono_mb_emit_ldloc (mb, my_entry_var);
856 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
857 mono_mb_emit_byte (mb, MONO_CEE_ADD);
858 mono_mb_emit_stloc (mb, start_var);
862 * } while (start < end);
864 start_loop = mono_mb_get_label (mb);
865 mono_mb_emit_ldloc (mb, start_var);
866 mono_mb_emit_icon (mb, 0);
867 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
868 mono_mb_emit_ldloc (mb, start_var);
869 mono_mb_emit_icon (mb, sizeof (gpointer));
870 mono_mb_emit_byte (mb, MONO_CEE_ADD);
871 mono_mb_emit_stloc (mb, start_var);
873 mono_mb_emit_ldloc (mb, start_var);
874 mono_mb_emit_ldloc (mb, end_var);
875 mono_mb_emit_byte (mb, MONO_CEE_BLT_UN_S);
876 mono_mb_emit_byte (mb, start_loop - (mono_mb_get_label (mb) + 1));
877 } else if (atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING) {
878 /* need to clear just the sync pointer */
879 mono_mb_emit_ldloc (mb, my_entry_var);
880 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
881 mono_mb_emit_byte (mb, MONO_CEE_ADD);
882 mono_mb_emit_icon (mb, 0);
883 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
886 if (atype == ATYPE_STRING) {
887 /* need to set length and clear the last char */
888 /* s->length = len; */
889 mono_mb_emit_ldloc (mb, my_entry_var);
890 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, length));
891 mono_mb_emit_byte (mb, MONO_CEE_ADD);
892 mono_mb_emit_ldarg (mb, 1);
893 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
894 /* s->chars [len] = 0; */
895 mono_mb_emit_ldloc (mb, my_entry_var);
896 mono_mb_emit_ldloc (mb, bytes_var);
897 mono_mb_emit_icon (mb, 2);
898 mono_mb_emit_byte (mb, MONO_CEE_SUB);
899 mono_mb_emit_byte (mb, MONO_CEE_ADD);
900 mono_mb_emit_icon (mb, 0);
901 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
904 /* return my_entry; */
905 mono_mb_emit_ldloc (mb, my_entry_var);
906 mono_mb_emit_byte (mb, MONO_CEE_RET);
908 mono_mb_patch_short_branch (mb, no_freelist_branch);
909 if (not_small_enough_branch > 0)
910 mono_mb_patch_short_branch (mb, not_small_enough_branch);
911 if (size_overflow_branch > 0)
912 mono_mb_patch_short_branch (mb, size_overflow_branch);
913 /* the slow path: we just call back into the runtime */
914 if (atype == ATYPE_STRING) {
915 mono_mb_emit_ldarg (mb, 1);
916 mono_mb_emit_icall (mb, mono_string_alloc);
918 mono_mb_emit_ldarg (mb, 0);
919 mono_mb_emit_icall (mb, mono_object_new_specific);
922 mono_mb_emit_byte (mb, MONO_CEE_RET);
924 res = mono_mb_create_method (mb, csig, 8);
926 mono_method_get_header (res)->init_locals = FALSE;
928 info = mono_image_alloc0 (mono_defaults.corlib, sizeof (AllocatorWrapperInfo));
929 info->gc_name = "boehm";
930 info->alloc_type = atype;
931 mono_marshal_set_wrapper_info (res, info);
936 static MonoMethod* alloc_method_cache [ATYPE_NUM];
938 static G_GNUC_UNUSED gboolean
939 mono_gc_is_critical_method (MonoMethod *method)
943 for (i = 0; i < ATYPE_NUM; ++i)
944 if (method == alloc_method_cache [i])
951 * If possible, generate a managed method that can quickly allocate objects in class
952 * @klass. The method will typically have an thread-local inline allocation sequence.
953 * The signature of the called method is:
954 * object allocate (MonoVTable *vtable)
955 * Some of the logic here is similar to mono_class_get_allocation_ftn () i object.c,
957 * The thread local alloc logic is taken from libgc/pthread_support.c.
961 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box)
965 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
967 /*g_print ("thread tls: %d\n", offset);*/
970 if (!SMALL_ENOUGH (klass->instance_size))
972 if (mono_class_has_finalizer (klass) || mono_class_is_marshalbyref (klass) || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
976 if (mono_class_is_open_constructed_type (&klass->byval_arg))
978 if (klass->byval_arg.type == MONO_TYPE_STRING) {
979 atype = ATYPE_STRING;
980 } else if (!klass->has_references) {
982 atype = ATYPE_FREEPTR_FOR_BOX;
984 atype = ATYPE_FREEPTR;
988 * disabled because we currently do a runtime choice anyway, to
989 * deal with multiple appdomains.
990 if (vtable->gc_descr != GC_NO_DESCRIPTOR)
993 atype = ATYPE_NORMAL;
996 return mono_gc_get_managed_allocator_by_type (atype);
1000 mono_gc_get_managed_array_allocator (MonoClass *klass)
1006 * mono_gc_get_managed_allocator_by_type:
1008 * Return a managed allocator method corresponding to allocator type ATYPE.
1011 mono_gc_get_managed_allocator_by_type (int atype)
1015 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
1017 mono_tls_key_set_offset (TLS_KEY_BOEHM_GC_THREAD, offset);
1019 res = alloc_method_cache [atype];
1023 res = create_allocator (atype, TLS_KEY_BOEHM_GC_THREAD);
1024 mono_mutex_lock (&mono_gc_lock);
1025 if (alloc_method_cache [atype]) {
1026 mono_free_method (res);
1027 res = alloc_method_cache [atype];
1029 mono_memory_barrier ();
1030 alloc_method_cache [atype] = res;
1032 mono_mutex_unlock (&mono_gc_lock);
1037 mono_gc_get_managed_allocator_types (void)
1043 mono_gc_get_write_barrier (void)
1045 g_assert_not_reached ();
1051 static G_GNUC_UNUSED gboolean
1052 mono_gc_is_critical_method (MonoMethod *method)
1058 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box)
1064 mono_gc_get_managed_array_allocator (MonoClass *klass)
1070 mono_gc_get_managed_allocator_by_type (int atype)
1076 mono_gc_get_managed_allocator_types (void)
1082 mono_gc_get_write_barrier (void)
1084 g_assert_not_reached ();
1091 mono_gc_get_gc_name (void)
1097 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
1099 return GC_call_with_alloc_lock (func, data);
1103 mono_gc_get_description (void)
1105 return g_strdup (DEFAULT_GC_NAME);
1109 mono_gc_set_desktop_mode (void)
1115 mono_gc_is_moving (void)
1121 mono_gc_is_disabled (void)
1123 if (GC_dont_gc || g_getenv ("GC_DONT_GC"))
1130 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
1132 g_assert_not_reached ();
1137 mono_gc_get_card_table (int *shift_bits, gpointer *card_mask)
1139 g_assert_not_reached ();
1144 mono_gc_card_table_nursery_check (void)
1146 g_assert_not_reached ();
1151 mono_gc_get_nursery (int *shift_bits, size_t *size)
1157 mono_gc_set_current_thread_appdomain (MonoDomain *domain)
1162 mono_gc_precise_stack_mark_enabled (void)
1168 mono_gc_get_logfile (void)
1174 mono_gc_conservatively_scan_area (void *start, void *end)
1176 g_assert_not_reached ();
1180 mono_gc_scan_object (void *obj, void *gc_data)
1182 g_assert_not_reached ();
1187 mono_gc_get_bitmap_for_descr (void *descr, int *numbits)
1189 g_assert_not_reached ();
1194 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
1199 mono_gc_set_stack_end (void *stack_end)
1203 void mono_gc_set_skip_thread (gboolean value)
1208 mono_gc_register_for_finalization (MonoObject *obj, void *user_data)
1213 /* This assertion is not valid when GC_DEBUG is defined */
1214 g_assert (GC_base (obj) == (char*)obj - offset);
1217 GC_REGISTER_FINALIZER_NO_ORDER ((char*)obj - offset, user_data, GUINT_TO_POINTER (offset), NULL, NULL);
1221 * These will call the redefined versions in libgc.
1227 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
1229 return pthread_create (new_thread, attr, start_routine, arg);
1233 mono_gc_pthread_join (pthread_t thread, void **retval)
1235 return pthread_join (thread, retval);
1239 mono_gc_pthread_detach (pthread_t thread)
1241 return pthread_detach (thread);
1245 mono_gc_pthread_exit (void *retval)
1247 pthread_exit (retval);
1248 g_assert_not_reached ();
1254 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
1256 #ifdef USE_INCLUDED_LIBGC
1257 return GC_DllMain (module_handle, reason, reserved);
1265 mono_gc_get_vtable_bits (MonoClass *class)
1267 if (fin_callbacks.is_class_finalization_aware) {
1268 if (fin_callbacks.is_class_finalization_aware (class))
1269 return BOEHM_GC_BIT_FINALIZER_AWARE;
1275 * mono_gc_register_altstack:
1277 * Register the dimensions of the normal stack and altstack with the collector.
1278 * Currently, STACK/STACK_SIZE is only used when the thread is suspended while it is on an altstack.
1281 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
1283 #ifdef USE_INCLUDED_LIBGC
1284 GC_register_altstack (stack, stack_size, altstack, altstack_size);
1289 mono_gc_get_los_limit (void)
1295 mono_gc_set_string_length (MonoString *str, gint32 new_length)
1297 mono_unichar2 *new_end = str->chars + new_length;
1299 /* zero the discarded string. This null-delimits the string and allows
1300 * the space to be reclaimed by SGen. */
1302 memset (new_end, 0, (str->length - new_length + 1) * sizeof (mono_unichar2));
1303 str->length = new_length;
1307 mono_gc_user_markers_supported (void)
1313 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
1315 g_assert_not_reached ();
1320 mono_gc_set_allow_synchronous_major (gboolean flag)
1324 /* Toggleref support */
1327 mono_gc_toggleref_add (MonoObject *object, mono_bool strong_ref)
1329 GC_toggleref_add ((GC_PTR)object, (int)strong_ref);
1333 mono_gc_toggleref_register_callback (MonoToggleRefStatus (*proccess_toggleref) (MonoObject *obj))
1335 GC_toggleref_register_callback ((int (*) (GC_PTR obj)) proccess_toggleref);
1338 /* Test support code */
1340 static MonoToggleRefStatus
1341 test_toggleref_callback (MonoObject *obj)
1343 static MonoClassField *mono_toggleref_test_field;
1344 int status = MONO_TOGGLE_REF_DROP;
1346 if (!mono_toggleref_test_field) {
1347 mono_toggleref_test_field = mono_class_get_field_from_name (mono_object_get_class (obj), "__test");
1348 g_assert (mono_toggleref_test_field);
1351 mono_field_get_value (obj, mono_toggleref_test_field, &status);
1352 printf ("toggleref-cb obj %d\n", status);
1357 register_test_toggleref_callback (void)
1359 mono_gc_toggleref_register_callback (test_toggleref_callback);
1363 is_finalization_aware (MonoObject *obj)
1365 MonoVTable *vt = obj->vtable;
1366 return (vt->gc_bits & BOEHM_GC_BIT_FINALIZER_AWARE) == BOEHM_GC_BIT_FINALIZER_AWARE;
1370 fin_notifier (MonoObject *obj)
1372 if (is_finalization_aware (obj))
1373 fin_callbacks.object_queued_for_finalization (obj);
1377 mono_gc_register_finalizer_callbacks (MonoGCFinalizerCallbacks *callbacks)
1379 if (callbacks->version != MONO_GC_FINALIZER_EXTENSION_VERSION)
1380 g_error ("Invalid finalizer callback version. Expected %d but got %d\n", MONO_GC_FINALIZER_EXTENSION_VERSION, callbacks->version);
1382 fin_callbacks = *callbacks;
1384 GC_set_finalizer_notify_proc ((void (*) (GC_PTR))fin_notifier);
1387 #endif /* no Boehm GC */