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);
63 mono_gc_warning (char *msg, GC_word arg)
65 mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_GC, msg, (unsigned long)arg);
69 mono_gc_base_init (void)
71 MonoThreadInfoCallbacks cb;
79 * Handle the case when we are called from a thread different from the main thread,
81 * FIXME: Move this to libgc where it belongs.
83 * we used to do this only when running on valgrind,
84 * but it happens also in other setups.
86 #if defined(HAVE_PTHREAD_GETATTR_NP) && defined(HAVE_PTHREAD_ATTR_GETSTACK) && !defined(__native_client__)
91 pthread_getattr_np (pthread_self (), &attr);
92 pthread_attr_getstack (&attr, &sstart, &size);
93 pthread_attr_destroy (&attr);
94 /*g_print ("stackbottom pth is: %p\n", (char*)sstart + size);*/
97 * The calculation above doesn't seem to work on ia64, also we need to set
98 * GC_register_stackbottom as well, but don't know how.
101 /* apparently with some linuxthreads implementations sstart can be NULL,
102 * fallback to the more imprecise method (bug# 78096).
105 GC_stackbottom = (char*)sstart + size;
108 gsize stack_bottom = (gsize)&dummy;
109 stack_bottom += 4095;
110 stack_bottom &= ~4095;
111 GC_stackbottom = (char*)stack_bottom;
115 #elif defined(HAVE_PTHREAD_GET_STACKSIZE_NP) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
116 GC_stackbottom = (char*)pthread_get_stackaddr_np (pthread_self ());
117 #elif defined(__OpenBSD__)
118 # include <pthread_np.h>
123 rslt = pthread_stackseg_np(pthread_self(), &ss);
124 g_assert (rslt == 0);
126 GC_stackbottom = (char*)ss.ss_sp;
128 #elif defined(__native_client__)
129 /* Do nothing, GC_stackbottom is set correctly in libgc */
133 gsize stack_bottom = (gsize)&dummy;
134 stack_bottom += 4095;
135 stack_bottom &= ~4095;
136 /*g_print ("stackbottom is: %p\n", (char*)stack_bottom);*/
137 GC_stackbottom = (char*)stack_bottom;
141 #if !defined(PLATFORM_ANDROID)
142 /* If GC_no_dls is set to true, GC_find_limit is not called. This causes a seg fault on Android. */
146 GC_oom_fn = mono_gc_out_of_memory;
147 GC_set_warn_proc (mono_gc_warning);
148 GC_finalize_on_demand = 1;
149 GC_finalizer_notifier = mono_gc_finalize_notify;
151 #ifdef HAVE_GC_GCJ_MALLOC
152 GC_init_gcj_malloc (5, NULL);
155 #ifdef HAVE_GC_ALLOW_REGISTER_THREADS
156 GC_allow_register_threads();
159 if ((env = g_getenv ("MONO_GC_PARAMS"))) {
160 char **ptr, **opts = g_strsplit (env, ",", -1);
161 for (ptr = opts; *ptr; ++ptr) {
163 if (g_str_has_prefix (opt, "max-heap-size=")) {
166 opt = strchr (opt, '=') + 1;
167 if (*opt && mono_gc_parse_environment_string_extract_number (opt, &max_heap)) {
168 if (max_heap < MIN_BOEHM_MAX_HEAP_SIZE) {
169 fprintf (stderr, "max-heap-size must be at least %dMb.\n", MIN_BOEHM_MAX_HEAP_SIZE_IN_MB);
172 GC_set_max_heap_size (max_heap);
174 fprintf (stderr, "max-heap-size must be an integer.\n");
178 } else if (g_str_has_prefix (opt, "toggleref-test")) {
179 register_test_toggleref_callback ();
182 /* Could be a parameter for sgen */
184 fprintf (stderr, "MONO_GC_PARAMS must be a comma-delimited list of one or more of the following:\n");
185 fprintf (stderr, " max-heap-size=N (where N is an integer, possibly with a k, m or a g suffix)\n");
193 memset (&cb, 0, sizeof (cb));
194 cb.thread_register = boehm_thread_register;
195 cb.thread_unregister = boehm_thread_unregister;
196 cb.mono_method_is_critical = (gpointer)mono_runtime_is_critical_method;
198 cb.thread_exit = mono_gc_pthread_exit;
199 cb.mono_gc_pthread_create = (gpointer)mono_gc_pthread_create;
202 mono_threads_init (&cb, sizeof (MonoThreadInfo));
203 mono_mutex_init (&mono_gc_lock);
205 mono_thread_info_attach (&dummy);
207 mono_gc_enable_events ();
208 gc_initialized = TRUE;
213 * @generation: GC generation identifier
215 * Perform a garbage collection for the given generation, higher numbers
216 * mean usually older objects. Collecting a high-numbered generation
217 * implies collecting also the lower-numbered generations.
218 * The maximum value for @generation can be retrieved with a call to
219 * mono_gc_max_generation(), so this function is usually called as:
221 * mono_gc_collect (mono_gc_max_generation ());
224 mono_gc_collect (int generation)
226 #ifndef DISABLE_PERFCOUNTERS
227 mono_perfcounters->gc_induced++;
233 * mono_gc_max_generation:
235 * Get the maximum generation number used by the current garbage
236 * collector. The value will be 0 for the Boehm collector, 1 or more
237 * for the generational collectors.
239 * Returns: the maximum generation number.
242 mono_gc_max_generation (void)
248 * mono_gc_get_generation:
249 * @object: a managed object
251 * Get the garbage collector's generation that @object belongs to.
252 * Use this has a hint only.
254 * Returns: a garbage collector generation number
257 mono_gc_get_generation (MonoObject *object)
263 * mono_gc_collection_count:
264 * @generation: a GC generation number
266 * Get how many times a garbage collection has been performed
267 * for the given @generation number.
269 * Returns: the number of garbage collections
272 mono_gc_collection_count (int generation)
278 * mono_gc_add_memory_pressure:
279 * @value: amount of bytes
281 * Adjust the garbage collector's view of how many bytes of memory
282 * are indirectly referenced by managed objects (for example unmanaged
283 * memory holding image or other binary data).
284 * This is a hint only to the garbage collector algorithm.
285 * Note that negative amounts of @value will decrease the memory
289 mono_gc_add_memory_pressure (gint64 value)
294 * mono_gc_get_used_size:
296 * Get the approximate amount of memory used by managed objects.
298 * Returns: the amount of memory used in bytes
301 mono_gc_get_used_size (void)
303 return GC_get_heap_size () - GC_get_free_bytes ();
307 * mono_gc_get_heap_size:
309 * Get the amount of memory used by the garbage collector.
311 * Returns: the size of the heap in bytes
314 mono_gc_get_heap_size (void)
316 return GC_get_heap_size ();
320 mono_gc_is_gc_thread (void)
322 #if GC_VERSION_MAJOR >= 7
324 #elif defined(USE_INCLUDED_LIBGC)
325 return GC_thread_is_registered ();
331 extern int GC_thread_register_foreign (void *base_addr);
334 mono_gc_register_thread (void *baseptr)
336 return mono_thread_info_attach (baseptr) != NULL;
340 boehm_thread_register (MonoThreadInfo* info, void *baseptr)
342 #if GC_VERSION_MAJOR >= 7
343 struct GC_stack_base sb;
346 res = GC_get_stack_base (&sb);
347 if (res != GC_SUCCESS) {
348 sb.mem_base = baseptr;
350 /* Can't determine the register stack bounds */
351 g_error ("mono_gc_register_thread failed ().\n");
354 res = GC_register_my_thread (&sb);
355 if ((res != GC_SUCCESS) && (res != GC_DUPLICATE)) {
356 g_warning ("GC_register_my_thread () failed.\n");
361 if (mono_gc_is_gc_thread())
363 #if defined(USE_INCLUDED_LIBGC) && !defined(HOST_WIN32)
364 return GC_thread_register_foreign (baseptr) ? info : NULL;
372 boehm_thread_unregister (MonoThreadInfo *p)
374 MonoNativeThreadId tid;
376 tid = mono_thread_info_get_tid (p);
378 mono_threads_add_joinable_thread ((gpointer)tid);
382 mono_object_is_alive (MonoObject* o)
384 #ifdef USE_INCLUDED_LIBGC
385 return GC_is_marked ((gpointer)o);
392 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
397 #ifdef USE_INCLUDED_LIBGC
399 static gint64 gc_start_time;
402 on_gc_notification (GCEventType event)
404 MonoGCEvent e = (MonoGCEvent)event;
407 case MONO_GC_EVENT_PRE_STOP_WORLD:
408 MONO_GC_WORLD_STOP_BEGIN ();
409 mono_thread_info_suspend_lock ();
412 case MONO_GC_EVENT_POST_STOP_WORLD:
413 MONO_GC_WORLD_STOP_END ();
416 case MONO_GC_EVENT_PRE_START_WORLD:
417 MONO_GC_WORLD_RESTART_BEGIN (1);
420 case MONO_GC_EVENT_POST_START_WORLD:
421 MONO_GC_WORLD_RESTART_END (1);
422 mono_thread_info_suspend_unlock ();
425 case MONO_GC_EVENT_START:
427 #ifndef DISABLE_PERFCOUNTERS
428 if (mono_perfcounters)
429 mono_perfcounters->gc_collections0++;
431 gc_stats.major_gc_count ++;
432 gc_start_time = mono_100ns_ticks ();
435 case MONO_GC_EVENT_END:
437 #if defined(ENABLE_DTRACE) && defined(__sun__)
438 /* This works around a dtrace -G problem on Solaris.
439 Limit its actual use to when the probe is enabled. */
440 if (MONO_GC_END_ENABLED ())
444 #ifndef DISABLE_PERFCOUNTERS
445 if (mono_perfcounters) {
446 guint64 heap_size = GC_get_heap_size ();
447 guint64 used_size = heap_size - GC_get_free_bytes ();
448 mono_perfcounters->gc_total_bytes = used_size;
449 mono_perfcounters->gc_committed_bytes = heap_size;
450 mono_perfcounters->gc_reserved_bytes = heap_size;
451 mono_perfcounters->gc_gen0size = heap_size;
454 gc_stats.major_gc_time_usecs += (mono_100ns_ticks () - gc_start_time) / 10;
455 mono_trace_message (MONO_TRACE_GC, "gc took %d usecs", (mono_100ns_ticks () - gc_start_time) / 10);
459 mono_profiler_gc_event (e, 0);
463 on_gc_heap_resize (size_t new_size)
465 guint64 heap_size = GC_get_heap_size ();
466 #ifndef DISABLE_PERFCOUNTERS
467 if (mono_perfcounters) {
468 mono_perfcounters->gc_committed_bytes = heap_size;
469 mono_perfcounters->gc_reserved_bytes = heap_size;
470 mono_perfcounters->gc_gen0size = heap_size;
473 mono_profiler_gc_heap_resize (new_size);
477 mono_gc_enable_events (void)
479 GC_notify_event = on_gc_notification;
480 GC_on_heap_resize = on_gc_heap_resize;
486 mono_gc_enable_events (void)
493 mono_gc_register_root (char *start, size_t size, void *descr)
495 /* for some strange reason, they want one extra byte on the end */
496 GC_add_roots (start, start + size + 1);
502 mono_gc_deregister_root (char* addr)
505 /* FIXME: libgc doesn't define this work win32 for some reason */
506 /* FIXME: No size info */
507 GC_remove_roots (addr, addr + sizeof (gpointer) + 1);
512 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
514 /* libgc requires that we use HIDE_POINTER... */
515 *link_addr = (void*)HIDE_POINTER (obj);
517 GC_REGISTER_LONG_LINK (link_addr, obj);
519 GC_GENERAL_REGISTER_DISAPPEARING_LINK (link_addr, obj);
523 mono_gc_weak_link_remove (void **link_addr, gboolean track)
526 GC_unregister_long_link (link_addr);
528 GC_unregister_disappearing_link (link_addr);
533 reveal_link (gpointer link_addr)
535 void **link_a = link_addr;
536 return REVEAL_POINTER (*link_a);
540 mono_gc_weak_link_get (void **link_addr)
542 MonoObject *obj = GC_call_with_alloc_lock (reveal_link, link_addr);
543 if (obj == (MonoObject *) -1)
549 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
551 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
555 mono_gc_make_descr_for_object (gsize *bitmap, int numbits, size_t obj_size)
557 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
561 mono_gc_make_descr_for_array (int vector, gsize *elem_bitmap, int numbits, size_t elem_size)
563 /* libgc has no usable support for arrays... */
564 return GC_NO_DESCRIPTOR;
568 mono_gc_make_descr_from_bitmap (gsize *bitmap, int numbits)
570 #ifdef HAVE_GC_GCJ_MALLOC
571 /* It seems there are issues when the bitmap doesn't fit: play it safe */
573 return GC_NO_DESCRIPTOR;
575 return (gpointer)GC_make_descriptor ((GC_bitmap)bitmap, numbits);
582 mono_gc_make_root_descr_all_refs (int numbits)
588 mono_gc_alloc_fixed (size_t size, void *descr)
590 /* To help track down typed allocation bugs */
594 if (count == atoi (g_getenv ("COUNT2")))
596 if (count > atoi (g_getenv ("COUNT2")))
597 return GC_MALLOC (size);
601 return GC_MALLOC_EXPLICITLY_TYPED (size, (GC_descr)descr);
603 return GC_MALLOC (size);
607 mono_gc_free_fixed (void* addr)
612 mono_gc_invoke_finalizers (void)
614 /* There is a bug in GC_invoke_finalizer () in versions <= 6.2alpha4:
615 * the 'mem_freed' variable is not initialized when there are no
616 * objects to finalize, which leads to strange behavior later on.
617 * The check is necessary to work around that bug.
619 if (GC_should_invoke_finalizers ())
620 return GC_invoke_finalizers ();
625 mono_gc_pending_finalizers (void)
627 return GC_should_invoke_finalizers ();
631 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
633 *(void**)field_ptr = value;
637 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
639 *(void**)slot_ptr = value;
643 mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
645 mono_gc_memmove_aligned (dest_ptr, src_ptr, count * sizeof (gpointer));
649 mono_gc_wbarrier_generic_store (gpointer ptr, MonoObject* value)
651 *(void**)ptr = value;
655 mono_gc_wbarrier_generic_store_atomic (gpointer ptr, MonoObject *value)
657 InterlockedWritePointer (ptr, value);
661 mono_gc_wbarrier_generic_nostore (gpointer ptr)
666 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
668 mono_gc_memmove_atomic (dest, src, count * mono_class_value_size (klass, NULL));
672 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
674 /* do not copy the sync state */
675 mono_gc_memmove_aligned ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
676 mono_object_class (obj)->instance_size - sizeof (MonoObject));
680 mono_gc_clear_domain (MonoDomain *domain)
685 mono_gc_get_suspend_signal (void)
687 #ifdef USE_INCLUDED_GC
688 return GC_get_suspend_signal ();
695 mono_gc_get_restart_signal (void)
697 #ifdef USE_INCLUDED_GC
698 return GC_get_restart_signal ();
704 #if defined(USE_INCLUDED_LIBGC) && defined(USE_COMPILER_TLS) && defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
705 extern __thread MONO_TLS_FAST void* GC_thread_tls;
706 #include "metadata-internals.h"
712 while (!(v & (1 << i)))
719 ATYPE_FREEPTR_FOR_BOX,
727 create_allocator (int atype, int tls_key)
729 int index_var, bytes_var, my_fl_var, my_entry_var;
730 guint32 no_freelist_branch, not_small_enough_branch = 0;
731 guint32 size_overflow_branch = 0;
732 MonoMethodBuilder *mb;
734 MonoMethodSignature *csig;
735 AllocatorWrapperInfo *info;
737 if (atype == ATYPE_STRING) {
738 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
739 csig->ret = &mono_defaults.string_class->byval_arg;
740 csig->params [0] = &mono_defaults.int_class->byval_arg;
741 csig->params [1] = &mono_defaults.int32_class->byval_arg;
743 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
744 csig->ret = &mono_defaults.object_class->byval_arg;
745 csig->params [0] = &mono_defaults.int_class->byval_arg;
748 mb = mono_mb_new (mono_defaults.object_class, "Alloc", MONO_WRAPPER_ALLOC);
749 bytes_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
750 if (atype == ATYPE_STRING) {
751 /* a string alloator method takes the args: (vtable, len) */
752 /* bytes = (sizeof (MonoString) + ((len + 1) * 2)); */
753 mono_mb_emit_ldarg (mb, 1);
754 mono_mb_emit_icon (mb, 1);
755 mono_mb_emit_byte (mb, MONO_CEE_ADD);
756 mono_mb_emit_icon (mb, 1);
757 mono_mb_emit_byte (mb, MONO_CEE_SHL);
758 // sizeof (MonoString) might include padding
759 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, chars));
760 mono_mb_emit_byte (mb, MONO_CEE_ADD);
761 mono_mb_emit_stloc (mb, bytes_var);
763 /* bytes = vtable->klass->instance_size */
764 mono_mb_emit_ldarg (mb, 0);
765 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoVTable, klass));
766 mono_mb_emit_byte (mb, MONO_CEE_ADD);
767 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
768 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoClass, instance_size));
769 mono_mb_emit_byte (mb, MONO_CEE_ADD);
770 /* FIXME: assert instance_size stays a 4 byte integer */
771 mono_mb_emit_byte (mb, MONO_CEE_LDIND_U4);
772 mono_mb_emit_stloc (mb, bytes_var);
775 /* this is needed for strings/arrays only as the other big types are never allocated with this method */
776 if (atype == ATYPE_STRING) {
778 /* if (!SMALL_ENOUGH (bytes)) jump slow_path;*/
779 mono_mb_emit_ldloc (mb, bytes_var);
780 mono_mb_emit_icon (mb, (NFREELISTS-1) * GRANULARITY);
781 not_small_enough_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
782 /* check for overflow */
783 mono_mb_emit_ldloc (mb, bytes_var);
784 mono_mb_emit_icon (mb, sizeof (MonoString));
785 size_overflow_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
788 /* int index = INDEX_FROM_BYTES(bytes); */
789 index_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
791 mono_mb_emit_ldloc (mb, bytes_var);
792 mono_mb_emit_icon (mb, GRANULARITY - 1);
793 mono_mb_emit_byte (mb, MONO_CEE_ADD);
794 mono_mb_emit_icon (mb, shift_amount (GRANULARITY));
795 mono_mb_emit_byte (mb, MONO_CEE_SHR_UN);
796 mono_mb_emit_icon (mb, shift_amount (sizeof (gpointer)));
797 mono_mb_emit_byte (mb, MONO_CEE_SHL);
798 /* index var is already adjusted into bytes */
799 mono_mb_emit_stloc (mb, index_var);
801 my_fl_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
802 my_entry_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
803 /* my_fl = ((GC_thread)tsd) -> ptrfree_freelists + index; */
804 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
805 mono_mb_emit_byte (mb, 0x0D); /* CEE_MONO_TLS */
806 mono_mb_emit_i4 (mb, tls_key);
807 if (atype == ATYPE_FREEPTR || atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING)
808 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, ptrfree_freelists));
809 else if (atype == ATYPE_NORMAL)
810 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, normal_freelists));
811 else if (atype == ATYPE_GCJ)
812 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, gcj_freelists));
814 g_assert_not_reached ();
815 mono_mb_emit_byte (mb, MONO_CEE_ADD);
816 mono_mb_emit_ldloc (mb, index_var);
817 mono_mb_emit_byte (mb, MONO_CEE_ADD);
818 mono_mb_emit_stloc (mb, my_fl_var);
820 /* my_entry = *my_fl; */
821 mono_mb_emit_ldloc (mb, my_fl_var);
822 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
823 mono_mb_emit_stloc (mb, my_entry_var);
825 /* if (EXPECT((word)my_entry >= HBLKSIZE, 1)) { */
826 mono_mb_emit_ldloc (mb, my_entry_var);
827 mono_mb_emit_icon (mb, HBLKSIZE);
828 no_freelist_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
830 /* ptr_t next = obj_link(my_entry); *my_fl = next; */
831 mono_mb_emit_ldloc (mb, my_fl_var);
832 mono_mb_emit_ldloc (mb, my_entry_var);
833 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
834 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
836 /* set the vtable and clear the words in the object */
837 mono_mb_emit_ldloc (mb, my_entry_var);
838 mono_mb_emit_ldarg (mb, 0);
839 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
841 if (atype == ATYPE_FREEPTR) {
842 int start_var, end_var, start_loop;
843 /* end = my_entry + bytes; start = my_entry + sizeof (gpointer);
845 start_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
846 end_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
847 mono_mb_emit_ldloc (mb, my_entry_var);
848 mono_mb_emit_ldloc (mb, bytes_var);
849 mono_mb_emit_byte (mb, MONO_CEE_ADD);
850 mono_mb_emit_stloc (mb, end_var);
851 mono_mb_emit_ldloc (mb, my_entry_var);
852 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
853 mono_mb_emit_byte (mb, MONO_CEE_ADD);
854 mono_mb_emit_stloc (mb, start_var);
858 * } while (start < end);
860 start_loop = mono_mb_get_label (mb);
861 mono_mb_emit_ldloc (mb, start_var);
862 mono_mb_emit_icon (mb, 0);
863 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
864 mono_mb_emit_ldloc (mb, start_var);
865 mono_mb_emit_icon (mb, sizeof (gpointer));
866 mono_mb_emit_byte (mb, MONO_CEE_ADD);
867 mono_mb_emit_stloc (mb, start_var);
869 mono_mb_emit_ldloc (mb, start_var);
870 mono_mb_emit_ldloc (mb, end_var);
871 mono_mb_emit_byte (mb, MONO_CEE_BLT_UN_S);
872 mono_mb_emit_byte (mb, start_loop - (mono_mb_get_label (mb) + 1));
873 } else if (atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING) {
874 /* need to clear just the sync pointer */
875 mono_mb_emit_ldloc (mb, my_entry_var);
876 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
877 mono_mb_emit_byte (mb, MONO_CEE_ADD);
878 mono_mb_emit_icon (mb, 0);
879 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
882 if (atype == ATYPE_STRING) {
883 /* need to set length and clear the last char */
884 /* s->length = len; */
885 mono_mb_emit_ldloc (mb, my_entry_var);
886 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, length));
887 mono_mb_emit_byte (mb, MONO_CEE_ADD);
888 mono_mb_emit_ldarg (mb, 1);
889 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
890 /* s->chars [len] = 0; */
891 mono_mb_emit_ldloc (mb, my_entry_var);
892 mono_mb_emit_ldloc (mb, bytes_var);
893 mono_mb_emit_icon (mb, 2);
894 mono_mb_emit_byte (mb, MONO_CEE_SUB);
895 mono_mb_emit_byte (mb, MONO_CEE_ADD);
896 mono_mb_emit_icon (mb, 0);
897 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
900 /* return my_entry; */
901 mono_mb_emit_ldloc (mb, my_entry_var);
902 mono_mb_emit_byte (mb, MONO_CEE_RET);
904 mono_mb_patch_short_branch (mb, no_freelist_branch);
905 if (not_small_enough_branch > 0)
906 mono_mb_patch_short_branch (mb, not_small_enough_branch);
907 if (size_overflow_branch > 0)
908 mono_mb_patch_short_branch (mb, size_overflow_branch);
909 /* the slow path: we just call back into the runtime */
910 if (atype == ATYPE_STRING) {
911 mono_mb_emit_ldarg (mb, 1);
912 mono_mb_emit_icall (mb, mono_string_alloc);
914 mono_mb_emit_ldarg (mb, 0);
915 mono_mb_emit_icall (mb, mono_object_new_specific);
918 mono_mb_emit_byte (mb, MONO_CEE_RET);
920 res = mono_mb_create_method (mb, csig, 8);
922 mono_method_get_header (res)->init_locals = FALSE;
924 info = mono_image_alloc0 (mono_defaults.corlib, sizeof (AllocatorWrapperInfo));
925 info->gc_name = "boehm";
926 info->alloc_type = atype;
927 mono_marshal_set_wrapper_info (res, info);
932 static MonoMethod* alloc_method_cache [ATYPE_NUM];
934 static G_GNUC_UNUSED gboolean
935 mono_gc_is_critical_method (MonoMethod *method)
939 for (i = 0; i < ATYPE_NUM; ++i)
940 if (method == alloc_method_cache [i])
947 * If possible, generate a managed method that can quickly allocate objects in class
948 * @klass. The method will typically have an thread-local inline allocation sequence.
949 * The signature of the called method is:
950 * object allocate (MonoVTable *vtable)
951 * Some of the logic here is similar to mono_class_get_allocation_ftn () i object.c,
953 * The thread local alloc logic is taken from libgc/pthread_support.c.
957 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box)
961 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
963 /*g_print ("thread tls: %d\n", offset);*/
966 if (!SMALL_ENOUGH (klass->instance_size))
968 if (mono_class_has_finalizer (klass) || mono_class_is_marshalbyref (klass) || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
972 if (mono_class_is_open_constructed_type (&klass->byval_arg))
974 if (klass->byval_arg.type == MONO_TYPE_STRING) {
975 atype = ATYPE_STRING;
976 } else if (!klass->has_references) {
978 atype = ATYPE_FREEPTR_FOR_BOX;
980 atype = ATYPE_FREEPTR;
984 * disabled because we currently do a runtime choice anyway, to
985 * deal with multiple appdomains.
986 if (vtable->gc_descr != GC_NO_DESCRIPTOR)
989 atype = ATYPE_NORMAL;
992 return mono_gc_get_managed_allocator_by_type (atype);
996 mono_gc_get_managed_array_allocator (MonoClass *klass)
1002 * mono_gc_get_managed_allocator_by_type:
1004 * Return a managed allocator method corresponding to allocator type ATYPE.
1007 mono_gc_get_managed_allocator_by_type (int atype)
1011 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
1013 mono_tls_key_set_offset (TLS_KEY_BOEHM_GC_THREAD, offset);
1015 res = alloc_method_cache [atype];
1019 res = create_allocator (atype, TLS_KEY_BOEHM_GC_THREAD);
1020 mono_mutex_lock (&mono_gc_lock);
1021 if (alloc_method_cache [atype]) {
1022 mono_free_method (res);
1023 res = alloc_method_cache [atype];
1025 mono_memory_barrier ();
1026 alloc_method_cache [atype] = res;
1028 mono_mutex_unlock (&mono_gc_lock);
1033 mono_gc_get_managed_allocator_types (void)
1039 mono_gc_get_write_barrier (void)
1041 g_assert_not_reached ();
1047 static G_GNUC_UNUSED gboolean
1048 mono_gc_is_critical_method (MonoMethod *method)
1054 mono_gc_get_managed_allocator (MonoClass *klass, gboolean for_box)
1060 mono_gc_get_managed_array_allocator (MonoClass *klass)
1066 mono_gc_get_managed_allocator_by_type (int atype)
1072 mono_gc_get_managed_allocator_types (void)
1078 mono_gc_get_write_barrier (void)
1080 g_assert_not_reached ();
1087 mono_gc_get_gc_name (void)
1093 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
1095 return GC_call_with_alloc_lock (func, data);
1099 mono_gc_get_description (void)
1101 return g_strdup (DEFAULT_GC_NAME);
1105 mono_gc_set_desktop_mode (void)
1111 mono_gc_is_moving (void)
1117 mono_gc_is_disabled (void)
1119 if (GC_dont_gc || g_getenv ("GC_DONT_GC"))
1126 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
1128 g_assert_not_reached ();
1133 mono_gc_get_card_table (int *shift_bits, gpointer *card_mask)
1135 g_assert_not_reached ();
1140 mono_gc_card_table_nursery_check (void)
1142 g_assert_not_reached ();
1147 mono_gc_get_nursery (int *shift_bits, size_t *size)
1153 mono_gc_set_current_thread_appdomain (MonoDomain *domain)
1158 mono_gc_precise_stack_mark_enabled (void)
1164 mono_gc_get_logfile (void)
1170 mono_gc_conservatively_scan_area (void *start, void *end)
1172 g_assert_not_reached ();
1176 mono_gc_scan_object (void *obj)
1178 g_assert_not_reached ();
1183 mono_gc_get_bitmap_for_descr (void *descr, int *numbits)
1185 g_assert_not_reached ();
1190 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
1195 mono_gc_set_stack_end (void *stack_end)
1199 void mono_gc_set_skip_thread (gboolean value)
1204 mono_gc_register_for_finalization (MonoObject *obj, void *user_data)
1209 /* This assertion is not valid when GC_DEBUG is defined */
1210 g_assert (GC_base (obj) == (char*)obj - offset);
1213 GC_REGISTER_FINALIZER_NO_ORDER ((char*)obj - offset, user_data, GUINT_TO_POINTER (offset), NULL, NULL);
1217 * These will call the redefined versions in libgc.
1223 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
1225 return pthread_create (new_thread, attr, start_routine, arg);
1229 mono_gc_pthread_join (pthread_t thread, void **retval)
1231 return pthread_join (thread, retval);
1235 mono_gc_pthread_detach (pthread_t thread)
1237 return pthread_detach (thread);
1241 mono_gc_pthread_exit (void *retval)
1243 pthread_exit (retval);
1249 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
1251 #ifdef USE_INCLUDED_LIBGC
1252 return GC_DllMain (module_handle, reason, reserved);
1260 mono_gc_get_vtable_bits (MonoClass *class)
1266 * mono_gc_register_altstack:
1268 * Register the dimensions of the normal stack and altstack with the collector.
1269 * Currently, STACK/STACK_SIZE is only used when the thread is suspended while it is on an altstack.
1272 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
1274 #ifdef USE_INCLUDED_LIBGC
1275 GC_register_altstack (stack, stack_size, altstack, altstack_size);
1280 mono_gc_get_los_limit (void)
1286 mono_gc_user_markers_supported (void)
1292 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
1294 g_assert_not_reached ();
1299 mono_gc_set_allow_synchronous_major (gboolean flag)
1303 /* Toggleref support */
1306 mono_gc_toggleref_add (MonoObject *object, mono_bool strong_ref)
1308 GC_toggleref_add ((GC_PTR)object, (int)strong_ref);
1312 mono_gc_toggleref_register_callback (MonoToggleRefStatus (*proccess_toggleref) (MonoObject *obj))
1314 GC_toggleref_register_callback ((int (*) (GC_PTR obj)) proccess_toggleref);
1317 /* Test support code */
1319 static MonoToggleRefStatus
1320 test_toggleref_callback (MonoObject *obj)
1322 static MonoClassField *mono_toggleref_test_field;
1323 int status = MONO_TOGGLE_REF_DROP;
1325 if (!mono_toggleref_test_field) {
1326 mono_toggleref_test_field = mono_class_get_field_from_name (mono_object_get_class (obj), "__test");
1327 g_assert (mono_toggleref_test_field);
1330 mono_field_get_value (obj, mono_toggleref_test_field, &status);
1331 printf ("toggleref-cb obj %d\n", status);
1336 register_test_toggleref_callback (void)
1338 mono_gc_toggleref_register_callback (test_toggleref_callback);
1341 #endif /* no Boehm GC */