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/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 #if defined(PLATFORM_MACOSX) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
40 void *pthread_get_stackaddr_np(pthread_t);
43 #define GC_NO_DESCRIPTOR ((gpointer)(0 | GC_DS_LENGTH))
44 /*Boehm max heap cannot be smaller than 16MB*/
45 #define MIN_BOEHM_MAX_HEAP_SIZE_IN_MB 16
46 #define MIN_BOEHM_MAX_HEAP_SIZE (MIN_BOEHM_MAX_HEAP_SIZE_IN_MB << 20)
48 static gboolean gc_initialized = FALSE;
51 boehm_thread_register (MonoThreadInfo* info, void *baseptr);
54 mono_gc_warning (char *msg, GC_word arg)
56 mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_GC, msg, (unsigned long)arg);
60 mono_gc_base_init (void)
62 MonoThreadInfoCallbacks cb;
69 * Handle the case when we are called from a thread different from the main thread,
71 * FIXME: Move this to libgc where it belongs.
73 * we used to do this only when running on valgrind,
74 * but it happens also in other setups.
76 #if defined(HAVE_PTHREAD_GETATTR_NP) && defined(HAVE_PTHREAD_ATTR_GETSTACK) && !defined(__native_client__)
81 pthread_getattr_np (pthread_self (), &attr);
82 pthread_attr_getstack (&attr, &sstart, &size);
83 pthread_attr_destroy (&attr);
84 /*g_print ("stackbottom pth is: %p\n", (char*)sstart + size);*/
87 * The calculation above doesn't seem to work on ia64, also we need to set
88 * GC_register_stackbottom as well, but don't know how.
91 /* apparently with some linuxthreads implementations sstart can be NULL,
92 * fallback to the more imprecise method (bug# 78096).
95 GC_stackbottom = (char*)sstart + size;
98 gsize stack_bottom = (gsize)&dummy;
100 stack_bottom &= ~4095;
101 GC_stackbottom = (char*)stack_bottom;
105 #elif defined(HAVE_PTHREAD_GET_STACKSIZE_NP) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
106 GC_stackbottom = (char*)pthread_get_stackaddr_np (pthread_self ());
107 #elif defined(__OpenBSD__)
108 # include <pthread_np.h>
113 rslt = pthread_stackseg_np(pthread_self(), &ss);
114 g_assert (rslt == 0);
116 GC_stackbottom = (char*)ss.ss_sp;
118 #elif defined(__native_client__)
119 /* Do nothing, GC_stackbottom is set correctly in libgc */
123 gsize stack_bottom = (gsize)&dummy;
124 stack_bottom += 4095;
125 stack_bottom &= ~4095;
126 /*g_print ("stackbottom is: %p\n", (char*)stack_bottom);*/
127 GC_stackbottom = (char*)stack_bottom;
131 #if !defined(PLATFORM_ANDROID)
132 /* If GC_no_dls is set to true, GC_find_limit is not called. This causes a seg fault on Android. */
136 GC_oom_fn = mono_gc_out_of_memory;
137 GC_set_warn_proc (mono_gc_warning);
138 GC_finalize_on_demand = 1;
139 GC_finalizer_notifier = mono_gc_finalize_notify;
141 #ifdef HAVE_GC_GCJ_MALLOC
142 GC_init_gcj_malloc (5, NULL);
145 #ifdef HAVE_GC_ALLOW_REGISTER_THREADS
146 GC_allow_register_threads();
149 if ((env = g_getenv ("MONO_GC_PARAMS"))) {
150 char **ptr, **opts = g_strsplit (env, ",", -1);
151 for (ptr = opts; *ptr; ++ptr) {
153 if (g_str_has_prefix (opt, "max-heap-size=")) {
156 opt = strchr (opt, '=') + 1;
157 if (*opt && mono_gc_parse_environment_string_extract_number (opt, &max_heap)) {
158 if (max_heap < MIN_BOEHM_MAX_HEAP_SIZE) {
159 fprintf (stderr, "max-heap-size must be at least %dMb.\n", MIN_BOEHM_MAX_HEAP_SIZE_IN_MB);
162 GC_set_max_heap_size (max_heap);
164 fprintf (stderr, "max-heap-size must be an integer.\n");
169 /* Could be a parameter for sgen */
171 fprintf (stderr, "MONO_GC_PARAMS must be a comma-delimited list of one or more of the following:\n");
172 fprintf (stderr, " max-heap-size=N (where N is an integer, possibly with a k, m or a g suffix)\n");
180 memset (&cb, 0, sizeof (cb));
181 cb.thread_register = boehm_thread_register;
182 cb.mono_method_is_critical = (gpointer)mono_runtime_is_critical_method;
184 cb.mono_gc_pthread_create = (gpointer)mono_gc_pthread_create;
187 mono_threads_init (&cb, sizeof (MonoThreadInfo));
189 mono_gc_enable_events ();
190 gc_initialized = TRUE;
195 * @generation: GC generation identifier
197 * Perform a garbage collection for the given generation, higher numbers
198 * mean usually older objects. Collecting a high-numbered generation
199 * implies collecting also the lower-numbered generations.
200 * The maximum value for @generation can be retrieved with a call to
201 * mono_gc_max_generation(), so this function is usually called as:
203 * mono_gc_collect (mono_gc_max_generation ());
206 mono_gc_collect (int generation)
208 #ifndef DISABLE_PERFCOUNTERS
209 mono_perfcounters->gc_induced++;
215 * mono_gc_max_generation:
217 * Get the maximum generation number used by the current garbage
218 * collector. The value will be 0 for the Boehm collector, 1 or more
219 * for the generational collectors.
221 * Returns: the maximum generation number.
224 mono_gc_max_generation (void)
230 * mono_gc_get_generation:
231 * @object: a managed object
233 * Get the garbage collector's generation that @object belongs to.
234 * Use this has a hint only.
236 * Returns: a garbage collector generation number
239 mono_gc_get_generation (MonoObject *object)
245 * mono_gc_collection_count:
246 * @generation: a GC generation number
248 * Get how many times a garbage collection has been performed
249 * for the given @generation number.
251 * Returns: the number of garbage collections
254 mono_gc_collection_count (int generation)
260 * mono_gc_add_memory_pressure:
261 * @value: amount of bytes
263 * Adjust the garbage collector's view of how many bytes of memory
264 * are indirectly referenced by managed objects (for example unmanaged
265 * memory holding image or other binary data).
266 * This is a hint only to the garbage collector algorithm.
267 * Note that negative amounts of @value will decrease the memory
271 mono_gc_add_memory_pressure (gint64 value)
276 * mono_gc_get_used_size:
278 * Get the approximate amount of memory used by managed objects.
280 * Returns: the amount of memory used in bytes
283 mono_gc_get_used_size (void)
285 return GC_get_heap_size () - GC_get_free_bytes ();
289 * mono_gc_get_heap_size:
291 * Get the amount of memory used by the garbage collector.
293 * Returns: the size of the heap in bytes
296 mono_gc_get_heap_size (void)
298 return GC_get_heap_size ();
302 mono_gc_is_gc_thread (void)
304 #if GC_VERSION_MAJOR >= 7
306 #elif defined(USE_INCLUDED_LIBGC)
307 return GC_thread_is_registered ();
313 extern int GC_thread_register_foreign (void *base_addr);
316 mono_gc_register_thread (void *baseptr)
318 return mono_thread_info_attach (baseptr) != NULL;
322 boehm_thread_register (MonoThreadInfo* info, void *baseptr)
324 #if GC_VERSION_MAJOR >= 7
325 struct GC_stack_base sb;
328 res = GC_get_stack_base (&sb);
329 if (res != GC_SUCCESS) {
330 sb.mem_base = baseptr;
332 /* Can't determine the register stack bounds */
333 g_error ("mono_gc_register_thread failed ().\n");
336 res = GC_register_my_thread (&sb);
337 if ((res != GC_SUCCESS) && (res != GC_DUPLICATE)) {
338 g_warning ("GC_register_my_thread () failed.\n");
343 if (mono_gc_is_gc_thread())
345 #if defined(USE_INCLUDED_LIBGC) && !defined(HOST_WIN32)
346 return GC_thread_register_foreign (baseptr) ? info : NULL;
354 mono_object_is_alive (MonoObject* o)
356 #ifdef USE_INCLUDED_LIBGC
357 return GC_is_marked ((gpointer)o);
364 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
369 #ifdef USE_INCLUDED_LIBGC
371 static gint64 gc_start_time;
374 on_gc_notification (GCEventType event)
376 MonoGCEvent e = (MonoGCEvent)event;
379 case MONO_GC_EVENT_PRE_STOP_WORLD:
380 MONO_GC_WORLD_STOP_BEGIN ();
381 mono_thread_info_suspend_lock ();
384 case MONO_GC_EVENT_POST_STOP_WORLD:
385 MONO_GC_WORLD_STOP_END ();
388 case MONO_GC_EVENT_PRE_START_WORLD:
389 MONO_GC_WORLD_RESTART_BEGIN (1);
392 case MONO_GC_EVENT_POST_START_WORLD:
393 MONO_GC_WORLD_RESTART_END (1);
394 mono_thread_info_suspend_unlock ();
397 case MONO_GC_EVENT_START:
399 #ifndef DISABLE_PERFCOUNTERS
400 if (mono_perfcounters)
401 mono_perfcounters->gc_collections0++;
403 gc_stats.major_gc_count ++;
404 gc_start_time = mono_100ns_ticks ();
407 case MONO_GC_EVENT_END:
409 #if defined(ENABLE_DTRACE) && defined(__sun__)
410 /* This works around a dtrace -G problem on Solaris.
411 Limit its actual use to when the probe is enabled. */
412 if (MONO_GC_END_ENABLED ())
416 #ifndef DISABLE_PERFCOUNTERS
417 if (mono_perfcounters) {
418 guint64 heap_size = GC_get_heap_size ();
419 guint64 used_size = heap_size - GC_get_free_bytes ();
420 mono_perfcounters->gc_total_bytes = used_size;
421 mono_perfcounters->gc_committed_bytes = heap_size;
422 mono_perfcounters->gc_reserved_bytes = heap_size;
423 mono_perfcounters->gc_gen0size = heap_size;
426 gc_stats.major_gc_time_usecs += (mono_100ns_ticks () - gc_start_time) / 10;
427 mono_trace_message (MONO_TRACE_GC, "gc took %d usecs", (mono_100ns_ticks () - gc_start_time) / 10);
431 mono_profiler_gc_event (e, 0);
435 on_gc_heap_resize (size_t new_size)
437 guint64 heap_size = GC_get_heap_size ();
438 #ifndef DISABLE_PERFCOUNTERS
439 if (mono_perfcounters) {
440 mono_perfcounters->gc_committed_bytes = heap_size;
441 mono_perfcounters->gc_reserved_bytes = heap_size;
442 mono_perfcounters->gc_gen0size = heap_size;
445 mono_profiler_gc_heap_resize (new_size);
449 mono_gc_enable_events (void)
451 GC_notify_event = on_gc_notification;
452 GC_on_heap_resize = on_gc_heap_resize;
458 mono_gc_enable_events (void)
465 mono_gc_register_root (char *start, size_t size, void *descr)
467 /* for some strange reason, they want one extra byte on the end */
468 GC_add_roots (start, start + size + 1);
474 mono_gc_deregister_root (char* addr)
477 /* FIXME: libgc doesn't define this work win32 for some reason */
478 /* FIXME: No size info */
479 GC_remove_roots (addr, addr + sizeof (gpointer) + 1);
484 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
486 /* libgc requires that we use HIDE_POINTER... */
487 *link_addr = (void*)HIDE_POINTER (obj);
489 GC_REGISTER_LONG_LINK (link_addr, obj);
491 GC_GENERAL_REGISTER_DISAPPEARING_LINK (link_addr, obj);
495 mono_gc_weak_link_remove (void **link_addr, gboolean track)
498 GC_unregister_long_link (link_addr);
500 GC_unregister_disappearing_link (link_addr);
505 reveal_link (gpointer link_addr)
507 void **link_a = link_addr;
508 return REVEAL_POINTER (*link_a);
512 mono_gc_weak_link_get (void **link_addr)
514 MonoObject *obj = GC_call_with_alloc_lock (reveal_link, link_addr);
515 if (obj == (MonoObject *) -1)
521 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
523 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
527 mono_gc_make_descr_for_object (gsize *bitmap, int numbits, size_t obj_size)
529 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
533 mono_gc_make_descr_for_array (int vector, gsize *elem_bitmap, int numbits, size_t elem_size)
535 /* libgc has no usable support for arrays... */
536 return GC_NO_DESCRIPTOR;
540 mono_gc_make_descr_from_bitmap (gsize *bitmap, int numbits)
542 #ifdef HAVE_GC_GCJ_MALLOC
543 /* It seems there are issues when the bitmap doesn't fit: play it safe */
545 return GC_NO_DESCRIPTOR;
547 return (gpointer)GC_make_descriptor ((GC_bitmap)bitmap, numbits);
554 mono_gc_make_root_descr_all_refs (int numbits)
560 mono_gc_alloc_fixed (size_t size, void *descr)
562 /* To help track down typed allocation bugs */
566 if (count == atoi (g_getenv ("COUNT2")))
568 if (count > atoi (g_getenv ("COUNT2")))
569 return GC_MALLOC (size);
573 return GC_MALLOC_EXPLICITLY_TYPED (size, (GC_descr)descr);
575 return GC_MALLOC (size);
579 mono_gc_free_fixed (void* addr)
584 mono_gc_invoke_finalizers (void)
586 /* There is a bug in GC_invoke_finalizer () in versions <= 6.2alpha4:
587 * the 'mem_freed' variable is not initialized when there are no
588 * objects to finalize, which leads to strange behavior later on.
589 * The check is necessary to work around that bug.
591 if (GC_should_invoke_finalizers ())
592 return GC_invoke_finalizers ();
597 mono_gc_pending_finalizers (void)
599 return GC_should_invoke_finalizers ();
603 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
605 *(void**)field_ptr = value;
609 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
611 *(void**)slot_ptr = value;
615 mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
617 mono_gc_memmove (dest_ptr, src_ptr, count * sizeof (gpointer));
621 mono_gc_wbarrier_generic_store (gpointer ptr, MonoObject* value)
623 *(void**)ptr = value;
627 mono_gc_wbarrier_generic_nostore (gpointer ptr)
632 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
634 mono_gc_memmove (dest, src, count * mono_class_value_size (klass, NULL));
638 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
640 /* do not copy the sync state */
641 mono_gc_memmove ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
642 mono_object_class (obj)->instance_size - sizeof (MonoObject));
646 mono_gc_clear_domain (MonoDomain *domain)
651 mono_gc_get_suspend_signal (void)
653 #ifdef USE_INCLUDED_GC
654 return GC_get_suspend_signal ();
660 #if defined(USE_INCLUDED_LIBGC) && defined(USE_COMPILER_TLS) && defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
661 extern __thread MONO_TLS_FAST void* GC_thread_tls;
662 #include "metadata-internals.h"
668 while (!(v & (1 << i)))
675 ATYPE_FREEPTR_FOR_BOX,
683 create_allocator (int atype, int tls_key)
685 int index_var, bytes_var, my_fl_var, my_entry_var;
686 guint32 no_freelist_branch, not_small_enough_branch = 0;
687 guint32 size_overflow_branch = 0;
688 MonoMethodBuilder *mb;
690 MonoMethodSignature *csig;
691 AllocatorWrapperInfo *info;
693 if (atype == ATYPE_STRING) {
694 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
695 csig->ret = &mono_defaults.string_class->byval_arg;
696 csig->params [0] = &mono_defaults.int_class->byval_arg;
697 csig->params [1] = &mono_defaults.int32_class->byval_arg;
699 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
700 csig->ret = &mono_defaults.object_class->byval_arg;
701 csig->params [0] = &mono_defaults.int_class->byval_arg;
704 mb = mono_mb_new (mono_defaults.object_class, "Alloc", MONO_WRAPPER_ALLOC);
705 bytes_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
706 if (atype == ATYPE_STRING) {
707 /* a string alloator method takes the args: (vtable, len) */
708 /* bytes = (sizeof (MonoString) + ((len + 1) * 2)); */
709 mono_mb_emit_ldarg (mb, 1);
710 mono_mb_emit_icon (mb, 1);
711 mono_mb_emit_byte (mb, MONO_CEE_ADD);
712 mono_mb_emit_icon (mb, 1);
713 mono_mb_emit_byte (mb, MONO_CEE_SHL);
714 // sizeof (MonoString) might include padding
715 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, chars));
716 mono_mb_emit_byte (mb, MONO_CEE_ADD);
717 mono_mb_emit_stloc (mb, bytes_var);
719 /* bytes = vtable->klass->instance_size */
720 mono_mb_emit_ldarg (mb, 0);
721 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoVTable, klass));
722 mono_mb_emit_byte (mb, MONO_CEE_ADD);
723 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
724 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoClass, instance_size));
725 mono_mb_emit_byte (mb, MONO_CEE_ADD);
726 /* FIXME: assert instance_size stays a 4 byte integer */
727 mono_mb_emit_byte (mb, MONO_CEE_LDIND_U4);
728 mono_mb_emit_stloc (mb, bytes_var);
731 /* this is needed for strings/arrays only as the other big types are never allocated with this method */
732 if (atype == ATYPE_STRING) {
734 /* if (!SMALL_ENOUGH (bytes)) jump slow_path;*/
735 mono_mb_emit_ldloc (mb, bytes_var);
736 mono_mb_emit_icon (mb, (NFREELISTS-1) * GRANULARITY);
737 not_small_enough_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
738 /* check for overflow */
739 mono_mb_emit_ldloc (mb, bytes_var);
740 mono_mb_emit_icon (mb, sizeof (MonoString));
741 size_overflow_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
744 /* int index = INDEX_FROM_BYTES(bytes); */
745 index_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
747 mono_mb_emit_ldloc (mb, bytes_var);
748 mono_mb_emit_icon (mb, GRANULARITY - 1);
749 mono_mb_emit_byte (mb, MONO_CEE_ADD);
750 mono_mb_emit_icon (mb, shift_amount (GRANULARITY));
751 mono_mb_emit_byte (mb, MONO_CEE_SHR_UN);
752 mono_mb_emit_icon (mb, shift_amount (sizeof (gpointer)));
753 mono_mb_emit_byte (mb, MONO_CEE_SHL);
754 /* index var is already adjusted into bytes */
755 mono_mb_emit_stloc (mb, index_var);
757 my_fl_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
758 my_entry_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
759 /* my_fl = ((GC_thread)tsd) -> ptrfree_freelists + index; */
760 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
761 mono_mb_emit_byte (mb, 0x0D); /* CEE_MONO_TLS */
762 mono_mb_emit_i4 (mb, tls_key);
763 if (atype == ATYPE_FREEPTR || atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING)
764 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, ptrfree_freelists));
765 else if (atype == ATYPE_NORMAL)
766 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, normal_freelists));
767 else if (atype == ATYPE_GCJ)
768 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, gcj_freelists));
770 g_assert_not_reached ();
771 mono_mb_emit_byte (mb, MONO_CEE_ADD);
772 mono_mb_emit_ldloc (mb, index_var);
773 mono_mb_emit_byte (mb, MONO_CEE_ADD);
774 mono_mb_emit_stloc (mb, my_fl_var);
776 /* my_entry = *my_fl; */
777 mono_mb_emit_ldloc (mb, my_fl_var);
778 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
779 mono_mb_emit_stloc (mb, my_entry_var);
781 /* if (EXPECT((word)my_entry >= HBLKSIZE, 1)) { */
782 mono_mb_emit_ldloc (mb, my_entry_var);
783 mono_mb_emit_icon (mb, HBLKSIZE);
784 no_freelist_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
786 /* ptr_t next = obj_link(my_entry); *my_fl = next; */
787 mono_mb_emit_ldloc (mb, my_fl_var);
788 mono_mb_emit_ldloc (mb, my_entry_var);
789 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
790 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
792 /* set the vtable and clear the words in the object */
793 mono_mb_emit_ldloc (mb, my_entry_var);
794 mono_mb_emit_ldarg (mb, 0);
795 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
797 if (atype == ATYPE_FREEPTR) {
798 int start_var, end_var, start_loop;
799 /* end = my_entry + bytes; start = my_entry + sizeof (gpointer);
801 start_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
802 end_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
803 mono_mb_emit_ldloc (mb, my_entry_var);
804 mono_mb_emit_ldloc (mb, bytes_var);
805 mono_mb_emit_byte (mb, MONO_CEE_ADD);
806 mono_mb_emit_stloc (mb, end_var);
807 mono_mb_emit_ldloc (mb, my_entry_var);
808 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
809 mono_mb_emit_byte (mb, MONO_CEE_ADD);
810 mono_mb_emit_stloc (mb, start_var);
814 * } while (start < end);
816 start_loop = mono_mb_get_label (mb);
817 mono_mb_emit_ldloc (mb, start_var);
818 mono_mb_emit_icon (mb, 0);
819 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
820 mono_mb_emit_ldloc (mb, start_var);
821 mono_mb_emit_icon (mb, sizeof (gpointer));
822 mono_mb_emit_byte (mb, MONO_CEE_ADD);
823 mono_mb_emit_stloc (mb, start_var);
825 mono_mb_emit_ldloc (mb, start_var);
826 mono_mb_emit_ldloc (mb, end_var);
827 mono_mb_emit_byte (mb, MONO_CEE_BLT_UN_S);
828 mono_mb_emit_byte (mb, start_loop - (mono_mb_get_label (mb) + 1));
829 } else if (atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING) {
830 /* need to clear just the sync pointer */
831 mono_mb_emit_ldloc (mb, my_entry_var);
832 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
833 mono_mb_emit_byte (mb, MONO_CEE_ADD);
834 mono_mb_emit_icon (mb, 0);
835 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
838 if (atype == ATYPE_STRING) {
839 /* need to set length and clear the last char */
840 /* s->length = len; */
841 mono_mb_emit_ldloc (mb, my_entry_var);
842 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, length));
843 mono_mb_emit_byte (mb, MONO_CEE_ADD);
844 mono_mb_emit_ldarg (mb, 1);
845 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
846 /* s->chars [len] = 0; */
847 mono_mb_emit_ldloc (mb, my_entry_var);
848 mono_mb_emit_ldloc (mb, bytes_var);
849 mono_mb_emit_icon (mb, 2);
850 mono_mb_emit_byte (mb, MONO_CEE_SUB);
851 mono_mb_emit_byte (mb, MONO_CEE_ADD);
852 mono_mb_emit_icon (mb, 0);
853 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
856 /* return my_entry; */
857 mono_mb_emit_ldloc (mb, my_entry_var);
858 mono_mb_emit_byte (mb, MONO_CEE_RET);
860 mono_mb_patch_short_branch (mb, no_freelist_branch);
861 if (not_small_enough_branch > 0)
862 mono_mb_patch_short_branch (mb, not_small_enough_branch);
863 if (size_overflow_branch > 0)
864 mono_mb_patch_short_branch (mb, size_overflow_branch);
865 /* the slow path: we just call back into the runtime */
866 if (atype == ATYPE_STRING) {
867 mono_mb_emit_ldarg (mb, 1);
868 mono_mb_emit_icall (mb, mono_string_alloc);
870 mono_mb_emit_ldarg (mb, 0);
871 mono_mb_emit_icall (mb, mono_object_new_specific);
874 mono_mb_emit_byte (mb, MONO_CEE_RET);
876 res = mono_mb_create_method (mb, csig, 8);
878 mono_method_get_header (res)->init_locals = FALSE;
880 info = mono_image_alloc0 (mono_defaults.corlib, sizeof (AllocatorWrapperInfo));
881 info->gc_name = "boehm";
882 info->alloc_type = atype;
883 mono_marshal_set_wrapper_info (res, info);
888 static MonoMethod* alloc_method_cache [ATYPE_NUM];
890 static G_GNUC_UNUSED gboolean
891 mono_gc_is_critical_method (MonoMethod *method)
895 for (i = 0; i < ATYPE_NUM; ++i)
896 if (method == alloc_method_cache [i])
903 * If possible, generate a managed method that can quickly allocate objects in class
904 * @klass. The method will typically have an thread-local inline allocation sequence.
905 * The signature of the called method is:
906 * object allocate (MonoVTable *vtable)
907 * Some of the logic here is similar to mono_class_get_allocation_ftn () i object.c,
909 * The thread local alloc logic is taken from libgc/pthread_support.c.
913 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box)
917 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
919 /*g_print ("thread tls: %d\n", offset);*/
922 if (!SMALL_ENOUGH (klass->instance_size))
924 if (mono_class_has_finalizer (klass) || mono_class_is_marshalbyref (klass) || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
928 if (mono_class_is_open_constructed_type (&klass->byval_arg))
930 if (klass->byval_arg.type == MONO_TYPE_STRING) {
931 atype = ATYPE_STRING;
932 } else if (!klass->has_references) {
934 atype = ATYPE_FREEPTR_FOR_BOX;
936 atype = ATYPE_FREEPTR;
940 * disabled because we currently do a runtime choice anyway, to
941 * deal with multiple appdomains.
942 if (vtable->gc_descr != GC_NO_DESCRIPTOR)
945 atype = ATYPE_NORMAL;
948 return mono_gc_get_managed_allocator_by_type (atype);
952 mono_gc_get_managed_array_allocator (MonoClass *klass)
958 * mono_gc_get_managed_allocator_by_type:
960 * Return a managed allocator method corresponding to allocator type ATYPE.
963 mono_gc_get_managed_allocator_by_type (int atype)
967 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
969 mono_tls_key_set_offset (TLS_KEY_BOEHM_GC_THREAD, offset);
972 res = alloc_method_cache [atype];
974 res = alloc_method_cache [atype] = create_allocator (atype, TLS_KEY_BOEHM_GC_THREAD);
975 mono_loader_unlock ();
980 mono_gc_get_managed_allocator_types (void)
986 mono_gc_get_write_barrier (void)
988 g_assert_not_reached ();
994 static G_GNUC_UNUSED gboolean
995 mono_gc_is_critical_method (MonoMethod *method)
1001 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box)
1007 mono_gc_get_managed_array_allocator (MonoClass *klass)
1013 mono_gc_get_managed_allocator_by_type (int atype)
1019 mono_gc_get_managed_allocator_types (void)
1025 mono_gc_get_write_barrier (void)
1027 g_assert_not_reached ();
1034 mono_gc_get_gc_name (void)
1040 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
1042 return GC_call_with_alloc_lock (func, data);
1046 mono_gc_get_description (void)
1048 return g_strdup (DEFAULT_GC_NAME);
1052 mono_gc_set_desktop_mode (void)
1058 mono_gc_is_moving (void)
1064 mono_gc_is_disabled (void)
1066 if (GC_dont_gc || g_getenv ("GC_DONT_GC"))
1073 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
1075 g_assert_not_reached ();
1080 mono_gc_get_card_table (int *shift_bits, gpointer *card_mask)
1082 g_assert_not_reached ();
1087 mono_gc_card_table_nursery_check (void)
1089 g_assert_not_reached ();
1094 mono_gc_get_nursery (int *shift_bits, size_t *size)
1100 mono_gc_set_current_thread_appdomain (MonoDomain *domain)
1105 mono_gc_precise_stack_mark_enabled (void)
1111 mono_gc_get_logfile (void)
1117 mono_gc_conservatively_scan_area (void *start, void *end)
1119 g_assert_not_reached ();
1123 mono_gc_scan_object (void *obj)
1125 g_assert_not_reached ();
1130 mono_gc_get_bitmap_for_descr (void *descr, int *numbits)
1132 g_assert_not_reached ();
1137 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
1142 mono_gc_set_stack_end (void *stack_end)
1146 void mono_gc_set_skip_thread (gboolean value)
1151 mono_gc_register_for_finalization (MonoObject *obj, void *user_data)
1156 /* This assertion is not valid when GC_DEBUG is defined */
1157 g_assert (GC_base (obj) == (char*)obj - offset);
1160 GC_REGISTER_FINALIZER_NO_ORDER ((char*)obj - offset, user_data, GUINT_TO_POINTER (offset), NULL, NULL);
1164 * These will call the redefined versions in libgc.
1170 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
1172 return pthread_create (new_thread, attr, start_routine, arg);
1176 mono_gc_pthread_join (pthread_t thread, void **retval)
1178 return pthread_join (thread, retval);
1182 mono_gc_pthread_detach (pthread_t thread)
1184 return pthread_detach (thread);
1188 mono_gc_pthread_exit (void *retval)
1190 pthread_exit (retval);
1196 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
1198 #ifdef USE_INCLUDED_LIBGC
1199 return GC_DllMain (module_handle, reason, reserved);
1207 mono_gc_get_vtable_bits (MonoClass *class)
1213 * mono_gc_register_altstack:
1215 * Register the dimensions of the normal stack and altstack with the collector.
1216 * Currently, STACK/STACK_SIZE is only used when the thread is suspended while it is on an altstack.
1219 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
1221 #ifdef USE_INCLUDED_LIBGC
1222 GC_register_altstack (stack, stack_size, altstack, altstack_size);
1227 mono_gc_get_los_limit (void)
1233 mono_gc_user_markers_supported (void)
1239 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
1241 g_assert_not_reached ();
1246 mono_gc_set_allow_synchronous_major (gboolean flag)
1251 #endif /* no Boehm GC */