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/gc-internal.h>
17 #include <mono/metadata/profiler-private.h>
18 #include <mono/metadata/class-internals.h>
19 #include <mono/metadata/method-builder.h>
20 #include <mono/metadata/opcodes.h>
21 #include <mono/metadata/domain-internals.h>
22 #include <mono/metadata/metadata-internals.h>
23 #include <mono/metadata/marshal.h>
24 #include <mono/metadata/runtime.h>
25 #include <mono/utils/mono-logger-internal.h>
26 #include <mono/utils/mono-time.h>
27 #include <mono/utils/mono-threads.h>
28 #include <mono/utils/dtrace.h>
29 #include <mono/utils/gc_wrapper.h>
33 #ifdef USE_INCLUDED_LIBGC
36 #define THREAD_LOCAL_ALLOC 1
37 #include "private/pthread_support.h"
40 #if defined(PLATFORM_MACOSX) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
41 void *pthread_get_stackaddr_np(pthread_t);
44 #define GC_NO_DESCRIPTOR ((gpointer)(0 | GC_DS_LENGTH))
45 /*Boehm max heap cannot be smaller than 16MB*/
46 #define MIN_BOEHM_MAX_HEAP_SIZE_IN_MB 16
47 #define MIN_BOEHM_MAX_HEAP_SIZE (MIN_BOEHM_MAX_HEAP_SIZE_IN_MB << 20)
49 static gboolean gc_initialized = FALSE;
52 boehm_thread_register (MonoThreadInfo* info, void *baseptr);
55 mono_gc_warning (char *msg, GC_word arg)
57 mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_GC, msg, (unsigned long)arg);
61 mono_gc_base_init (void)
63 MonoThreadInfoCallbacks cb;
70 * Handle the case when we are called from a thread different from the main thread,
72 * FIXME: Move this to libgc where it belongs.
74 * we used to do this only when running on valgrind,
75 * but it happens also in other setups.
77 #if defined(HAVE_PTHREAD_GETATTR_NP) && defined(HAVE_PTHREAD_ATTR_GETSTACK)
82 pthread_getattr_np (pthread_self (), &attr);
83 pthread_attr_getstack (&attr, &sstart, &size);
84 pthread_attr_destroy (&attr);
85 /*g_print ("stackbottom pth is: %p\n", (char*)sstart + size);*/
88 * The calculation above doesn't seem to work on ia64, also we need to set
89 * GC_register_stackbottom as well, but don't know how.
92 /* apparently with some linuxthreads implementations sstart can be NULL,
93 * fallback to the more imprecise method (bug# 78096).
96 GC_stackbottom = (char*)sstart + size;
99 gsize stack_bottom = (gsize)&dummy;
100 stack_bottom += 4095;
101 stack_bottom &= ~4095;
102 GC_stackbottom = (char*)stack_bottom;
106 #elif defined(HAVE_PTHREAD_GET_STACKSIZE_NP) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
107 GC_stackbottom = (char*)pthread_get_stackaddr_np (pthread_self ());
108 #elif defined(__OpenBSD__)
109 # include <pthread_np.h>
114 rslt = pthread_stackseg_np(pthread_self(), &ss);
115 g_assert (rslt == 0);
117 GC_stackbottom = (char*)ss.ss_sp;
119 #elif defined(__native_client__)
120 /* Do nothing, GC_stackbottom is set correctly in libgc */
124 gsize stack_bottom = (gsize)&dummy;
125 stack_bottom += 4095;
126 stack_bottom &= ~4095;
127 /*g_print ("stackbottom is: %p\n", (char*)stack_bottom);*/
128 GC_stackbottom = (char*)stack_bottom;
132 #if !defined(PLATFORM_ANDROID)
133 /* If GC_no_dls is set to true, GC_find_limit is not called. This causes a seg fault on Android. */
137 GC_oom_fn = mono_gc_out_of_memory;
138 GC_set_warn_proc (mono_gc_warning);
139 GC_finalize_on_demand = 1;
140 GC_finalizer_notifier = mono_gc_finalize_notify;
142 #ifdef HAVE_GC_GCJ_MALLOC
143 GC_init_gcj_malloc (5, NULL);
146 #ifdef HAVE_GC_ALLOW_REGISTER_THREADS
147 GC_allow_register_threads();
150 if ((env = getenv ("MONO_GC_PARAMS"))) {
151 char **ptr, **opts = g_strsplit (env, ",", -1);
152 for (ptr = opts; *ptr; ++ptr) {
154 if (g_str_has_prefix (opt, "max-heap-size=")) {
157 opt = strchr (opt, '=') + 1;
158 if (*opt && mono_gc_parse_environment_string_extract_number (opt, &max_heap)) {
159 if (max_heap < MIN_BOEHM_MAX_HEAP_SIZE) {
160 fprintf (stderr, "max-heap-size must be at least %dMb.\n", MIN_BOEHM_MAX_HEAP_SIZE_IN_MB);
163 GC_set_max_heap_size (max_heap);
165 fprintf (stderr, "max-heap-size must be an integer.\n");
170 /* Could be a parameter for sgen */
172 fprintf (stderr, "MONO_GC_PARAMS must be a comma-delimited list of one or more of the following:\n");
173 fprintf (stderr, " max-heap-size=N (where N is an integer, possibly with a k, m or a g suffix)\n");
181 memset (&cb, 0, sizeof (cb));
182 cb.thread_register = boehm_thread_register;
183 cb.mono_method_is_critical = (gpointer)mono_runtime_is_critical_method;
185 cb.mono_gc_pthread_create = (gpointer)mono_gc_pthread_create;
188 mono_threads_init (&cb, sizeof (MonoThreadInfo));
190 mono_gc_enable_events ();
191 gc_initialized = TRUE;
196 * @generation: GC generation identifier
198 * Perform a garbage collection for the given generation, higher numbers
199 * mean usually older objects. Collecting a high-numbered generation
200 * implies collecting also the lower-numbered generations.
201 * The maximum value for @generation can be retrieved with a call to
202 * mono_gc_max_generation(), so this function is usually called as:
204 * mono_gc_collect (mono_gc_max_generation ());
207 mono_gc_collect (int generation)
209 MONO_PROBE_GC_BEGIN (generation);
211 mono_perfcounters->gc_induced++;
214 MONO_PROBE_GC_END (generation);
215 #if defined(ENABLE_DTRACE) && defined(__sun__)
216 /* This works around a dtrace -G problem on Solaris.
217 Limit its actual use to when the probe is enabled. */
218 if (MONO_PROBE_GC_END_ENABLED ())
224 * mono_gc_max_generation:
226 * Get the maximum generation number used by the current garbage
227 * collector. The value will be 0 for the Boehm collector, 1 or more
228 * for the generational collectors.
230 * Returns: the maximum generation number.
233 mono_gc_max_generation (void)
239 * mono_gc_get_generation:
240 * @object: a managed object
242 * Get the garbage collector's generation that @object belongs to.
243 * Use this has a hint only.
245 * Returns: a garbage collector generation number
248 mono_gc_get_generation (MonoObject *object)
254 * mono_gc_collection_count:
255 * @generation: a GC generation number
257 * Get how many times a garbage collection has been performed
258 * for the given @generation number.
260 * Returns: the number of garbage collections
263 mono_gc_collection_count (int generation)
269 * mono_gc_add_memory_pressure:
270 * @value: amount of bytes
272 * Adjust the garbage collector's view of how many bytes of memory
273 * are indirectly referenced by managed objects (for example unmanaged
274 * memory holding image or other binary data).
275 * This is a hint only to the garbage collector algorithm.
276 * Note that negative amounts of @value will decrease the memory
280 mono_gc_add_memory_pressure (gint64 value)
285 * mono_gc_get_used_size:
287 * Get the approximate amount of memory used by managed objects.
289 * Returns: the amount of memory used in bytes
292 mono_gc_get_used_size (void)
294 return GC_get_heap_size () - GC_get_free_bytes ();
298 * mono_gc_get_heap_size:
300 * Get the amount of memory used by the garbage collector.
302 * Returns: the size of the heap in bytes
305 mono_gc_get_heap_size (void)
307 return GC_get_heap_size ();
311 mono_gc_disable (void)
313 #ifdef HAVE_GC_ENABLE
316 g_assert_not_reached ();
321 mono_gc_enable (void)
323 #ifdef HAVE_GC_ENABLE
326 g_assert_not_reached ();
331 mono_gc_is_gc_thread (void)
333 #if GC_VERSION_MAJOR >= 7
335 #elif defined(USE_INCLUDED_LIBGC)
336 return GC_thread_is_registered ();
342 extern int GC_thread_register_foreign (void *base_addr);
345 mono_gc_register_thread (void *baseptr)
347 return mono_thread_info_attach (baseptr) != NULL;
351 boehm_thread_register (MonoThreadInfo* info, void *baseptr)
353 #if GC_VERSION_MAJOR >= 7
354 struct GC_stack_base sb;
357 res = GC_get_stack_base (&sb);
358 if (res != GC_SUCCESS) {
359 sb.mem_base = baseptr;
361 /* Can't determine the register stack bounds */
362 g_error ("mono_gc_register_thread failed ().\n");
365 res = GC_register_my_thread (&sb);
366 if ((res != GC_SUCCESS) && (res != GC_DUPLICATE)) {
367 g_warning ("GC_register_my_thread () failed.\n");
372 if (mono_gc_is_gc_thread())
374 #if defined(USE_INCLUDED_LIBGC) && !defined(HOST_WIN32)
375 return GC_thread_register_foreign (baseptr) ? info : NULL;
383 mono_object_is_alive (MonoObject* o)
385 #ifdef USE_INCLUDED_LIBGC
386 return GC_is_marked ((gpointer)o);
393 mono_gc_walk_heap (int flags, MonoGCReferences callback, void *data)
398 #ifdef USE_INCLUDED_LIBGC
400 static gint64 gc_start_time;
403 on_gc_notification (GCEventType event)
405 MonoGCEvent e = (MonoGCEvent)event;
407 if (e == MONO_GC_EVENT_PRE_STOP_WORLD)
408 mono_thread_info_suspend_lock ();
409 else if (e == MONO_GC_EVENT_POST_START_WORLD)
410 mono_thread_info_suspend_unlock ();
412 if (e == MONO_GC_EVENT_START) {
413 if (mono_perfcounters)
414 mono_perfcounters->gc_collections0++;
415 mono_stats.major_gc_count ++;
416 gc_start_time = mono_100ns_ticks ();
417 } else if (e == MONO_GC_EVENT_END) {
418 if (mono_perfcounters) {
419 guint64 heap_size = GC_get_heap_size ();
420 guint64 used_size = heap_size - GC_get_free_bytes ();
421 mono_perfcounters->gc_total_bytes = used_size;
422 mono_perfcounters->gc_committed_bytes = heap_size;
423 mono_perfcounters->gc_reserved_bytes = heap_size;
424 mono_perfcounters->gc_gen0size = heap_size;
426 mono_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);
429 mono_profiler_gc_event (e, 0);
433 on_gc_heap_resize (size_t new_size)
435 guint64 heap_size = GC_get_heap_size ();
436 if (mono_perfcounters) {
437 mono_perfcounters->gc_committed_bytes = heap_size;
438 mono_perfcounters->gc_reserved_bytes = heap_size;
439 mono_perfcounters->gc_gen0size = heap_size;
441 mono_profiler_gc_heap_resize (new_size);
445 mono_gc_enable_events (void)
447 GC_notify_event = on_gc_notification;
448 GC_on_heap_resize = on_gc_heap_resize;
454 mono_gc_enable_events (void)
461 mono_gc_register_root (char *start, size_t size, void *descr)
463 /* for some strange reason, they want one extra byte on the end */
464 GC_add_roots (start, start + size + 1);
470 mono_gc_deregister_root (char* addr)
473 /* FIXME: libgc doesn't define this work win32 for some reason */
474 /* FIXME: No size info */
475 GC_remove_roots (addr, addr + sizeof (gpointer) + 1);
480 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
482 /* libgc requires that we use HIDE_POINTER... */
483 *link_addr = (void*)HIDE_POINTER (obj);
484 GC_GENERAL_REGISTER_DISAPPEARING_LINK (link_addr, obj);
488 mono_gc_weak_link_remove (void **link_addr)
490 GC_unregister_disappearing_link (link_addr);
495 reveal_link (gpointer link_addr)
497 void **link_a = link_addr;
498 return REVEAL_POINTER (*link_a);
502 mono_gc_weak_link_get (void **link_addr)
504 MonoObject *obj = GC_call_with_alloc_lock (reveal_link, link_addr);
505 if (obj == (MonoObject *) -1)
511 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
513 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
517 mono_gc_make_descr_for_object (gsize *bitmap, int numbits, size_t obj_size)
519 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
523 mono_gc_make_descr_for_array (int vector, gsize *elem_bitmap, int numbits, size_t elem_size)
525 /* libgc has no usable support for arrays... */
526 return GC_NO_DESCRIPTOR;
530 mono_gc_make_descr_from_bitmap (gsize *bitmap, int numbits)
532 #ifdef HAVE_GC_GCJ_MALLOC
533 /* It seems there are issues when the bitmap doesn't fit: play it safe */
535 return GC_NO_DESCRIPTOR;
537 return (gpointer)GC_make_descriptor ((GC_bitmap)bitmap, numbits);
544 mono_gc_make_root_descr_all_refs (int numbits)
550 mono_gc_alloc_fixed (size_t size, void *descr)
552 /* To help track down typed allocation bugs */
556 if (count == atoi (getenv ("COUNT2")))
558 if (count > atoi (getenv ("COUNT2")))
559 return GC_MALLOC (size);
563 return GC_MALLOC_EXPLICITLY_TYPED (size, (GC_descr)descr);
565 return GC_MALLOC (size);
569 mono_gc_free_fixed (void* addr)
574 mono_gc_invoke_finalizers (void)
576 /* There is a bug in GC_invoke_finalizer () in versions <= 6.2alpha4:
577 * the 'mem_freed' variable is not initialized when there are no
578 * objects to finalize, which leads to strange behavior later on.
579 * The check is necessary to work around that bug.
581 if (GC_should_invoke_finalizers ())
582 return GC_invoke_finalizers ();
587 mono_gc_pending_finalizers (void)
589 return GC_should_invoke_finalizers ();
593 * LOCKING: Assumes the domain_finalizers lock is held.
596 add_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
600 if (!domain->track_resurrection_objects_hash)
601 domain->track_resurrection_objects_hash = g_hash_table_new (mono_aligned_addr_hash, NULL);
603 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
604 refs = g_slist_prepend (refs, GUINT_TO_POINTER (gchandle));
605 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
609 mono_gc_add_weak_track_handle (MonoObject *obj, guint32 handle)
616 domain = mono_object_get_domain (obj);
618 mono_domain_finalizers_lock (domain);
620 add_weak_track_handle_internal (domain, obj, handle);
622 g_hash_table_insert (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (handle), obj);
624 mono_domain_finalizers_unlock (domain);
628 * LOCKING: Assumes the domain_finalizers lock is held.
631 remove_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
635 if (!domain->track_resurrection_objects_hash)
638 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
639 refs = g_slist_remove (refs, GUINT_TO_POINTER (gchandle));
640 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
644 mono_gc_change_weak_track_handle (MonoObject *old_obj, MonoObject *obj, guint32 gchandle)
646 MonoDomain *domain = mono_domain_get ();
648 mono_domain_finalizers_lock (domain);
651 remove_weak_track_handle_internal (domain, old_obj, gchandle);
653 add_weak_track_handle_internal (domain, obj, gchandle);
655 mono_domain_finalizers_unlock (domain);
659 mono_gc_remove_weak_track_handle (guint32 gchandle)
661 MonoDomain *domain = mono_domain_get ();
664 /* Clean our entries in the two hashes in MonoDomain */
666 mono_domain_finalizers_lock (domain);
668 /* Get the original object this handle pointed to */
669 obj = g_hash_table_lookup (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
671 g_hash_table_remove (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
673 remove_weak_track_handle_internal (domain, obj, gchandle);
676 mono_domain_finalizers_unlock (domain);
680 mono_gc_remove_weak_track_object (MonoDomain *domain, MonoObject *obj)
684 if (domain->track_resurrection_objects_hash) {
685 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
689 * Since we don't run finalizers again for resurrected objects,
690 * no need to keep these around.
692 g_hash_table_remove (domain->track_resurrection_objects_hash, obj);
699 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
701 *(void**)field_ptr = value;
705 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
707 *(void**)slot_ptr = value;
711 mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
713 mono_gc_memmove (dest_ptr, src_ptr, count * sizeof (gpointer));
717 mono_gc_wbarrier_generic_store (gpointer ptr, MonoObject* value)
719 *(void**)ptr = value;
723 mono_gc_wbarrier_generic_nostore (gpointer ptr)
728 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
730 mono_gc_memmove (dest, src, count * mono_class_value_size (klass, NULL));
734 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
736 /* do not copy the sync state */
737 mono_gc_memmove ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
738 mono_object_class (obj)->instance_size - sizeof (MonoObject));
742 mono_gc_clear_domain (MonoDomain *domain)
747 mono_gc_get_suspend_signal (void)
749 #ifdef USE_INCLUDED_GC
750 return GC_get_suspend_signal ();
756 #if defined(USE_INCLUDED_LIBGC) && defined(USE_COMPILER_TLS) && defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
757 extern __thread MONO_TLS_FAST void* GC_thread_tls;
758 #include "metadata-internals.h"
764 while (!(v & (1 << i)))
771 ATYPE_FREEPTR_FOR_BOX,
779 create_allocator (int atype, int offset)
781 int index_var, bytes_var, my_fl_var, my_entry_var;
782 guint32 no_freelist_branch, not_small_enough_branch = 0;
783 guint32 size_overflow_branch = 0;
784 MonoMethodBuilder *mb;
786 MonoMethodSignature *csig;
787 AllocatorWrapperInfo *info;
789 if (atype == ATYPE_STRING) {
790 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
791 csig->ret = &mono_defaults.string_class->byval_arg;
792 csig->params [0] = &mono_defaults.int_class->byval_arg;
793 csig->params [1] = &mono_defaults.int32_class->byval_arg;
795 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
796 csig->ret = &mono_defaults.object_class->byval_arg;
797 csig->params [0] = &mono_defaults.int_class->byval_arg;
800 mb = mono_mb_new (mono_defaults.object_class, "Alloc", MONO_WRAPPER_ALLOC);
801 bytes_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
802 if (atype == ATYPE_STRING) {
803 /* a string alloator method takes the args: (vtable, len) */
804 /* bytes = (sizeof (MonoString) + ((len + 1) * 2)); */
805 mono_mb_emit_ldarg (mb, 1);
806 mono_mb_emit_icon (mb, 1);
807 mono_mb_emit_byte (mb, MONO_CEE_ADD);
808 mono_mb_emit_icon (mb, 1);
809 mono_mb_emit_byte (mb, MONO_CEE_SHL);
810 // sizeof (MonoString) might include padding
811 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, chars));
812 mono_mb_emit_byte (mb, MONO_CEE_ADD);
813 mono_mb_emit_stloc (mb, bytes_var);
815 /* bytes = vtable->klass->instance_size */
816 mono_mb_emit_ldarg (mb, 0);
817 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoVTable, klass));
818 mono_mb_emit_byte (mb, MONO_CEE_ADD);
819 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
820 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoClass, instance_size));
821 mono_mb_emit_byte (mb, MONO_CEE_ADD);
822 /* FIXME: assert instance_size stays a 4 byte integer */
823 mono_mb_emit_byte (mb, MONO_CEE_LDIND_U4);
824 mono_mb_emit_stloc (mb, bytes_var);
827 /* this is needed for strings/arrays only as the other big types are never allocated with this method */
828 if (atype == ATYPE_STRING) {
830 /* if (!SMALL_ENOUGH (bytes)) jump slow_path;*/
831 mono_mb_emit_ldloc (mb, bytes_var);
832 mono_mb_emit_icon (mb, (NFREELISTS-1) * GRANULARITY);
833 not_small_enough_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
834 /* check for overflow */
835 mono_mb_emit_ldloc (mb, bytes_var);
836 mono_mb_emit_icon (mb, sizeof (MonoString));
837 size_overflow_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
840 /* int index = INDEX_FROM_BYTES(bytes); */
841 index_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
843 mono_mb_emit_ldloc (mb, bytes_var);
844 mono_mb_emit_icon (mb, GRANULARITY - 1);
845 mono_mb_emit_byte (mb, MONO_CEE_ADD);
846 mono_mb_emit_icon (mb, shift_amount (GRANULARITY));
847 mono_mb_emit_byte (mb, MONO_CEE_SHR_UN);
848 mono_mb_emit_icon (mb, shift_amount (sizeof (gpointer)));
849 mono_mb_emit_byte (mb, MONO_CEE_SHL);
850 /* index var is already adjusted into bytes */
851 mono_mb_emit_stloc (mb, index_var);
853 my_fl_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
854 my_entry_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
855 /* my_fl = ((GC_thread)tsd) -> ptrfree_freelists + index; */
856 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
857 mono_mb_emit_byte (mb, 0x0D); /* CEE_MONO_TLS */
858 mono_mb_emit_i4 (mb, offset);
859 if (atype == ATYPE_FREEPTR || atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING)
860 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, ptrfree_freelists));
861 else if (atype == ATYPE_NORMAL)
862 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, normal_freelists));
863 else if (atype == ATYPE_GCJ)
864 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, gcj_freelists));
866 g_assert_not_reached ();
867 mono_mb_emit_byte (mb, MONO_CEE_ADD);
868 mono_mb_emit_ldloc (mb, index_var);
869 mono_mb_emit_byte (mb, MONO_CEE_ADD);
870 mono_mb_emit_stloc (mb, my_fl_var);
872 /* my_entry = *my_fl; */
873 mono_mb_emit_ldloc (mb, my_fl_var);
874 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
875 mono_mb_emit_stloc (mb, my_entry_var);
877 /* if (EXPECT((word)my_entry >= HBLKSIZE, 1)) { */
878 mono_mb_emit_ldloc (mb, my_entry_var);
879 mono_mb_emit_icon (mb, HBLKSIZE);
880 no_freelist_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
882 /* ptr_t next = obj_link(my_entry); *my_fl = next; */
883 mono_mb_emit_ldloc (mb, my_fl_var);
884 mono_mb_emit_ldloc (mb, my_entry_var);
885 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
886 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
888 /* set the vtable and clear the words in the object */
889 mono_mb_emit_ldloc (mb, my_entry_var);
890 mono_mb_emit_ldarg (mb, 0);
891 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
893 if (atype == ATYPE_FREEPTR) {
894 int start_var, end_var, start_loop;
895 /* end = my_entry + bytes; start = my_entry + sizeof (gpointer);
897 start_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
898 end_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
899 mono_mb_emit_ldloc (mb, my_entry_var);
900 mono_mb_emit_ldloc (mb, bytes_var);
901 mono_mb_emit_byte (mb, MONO_CEE_ADD);
902 mono_mb_emit_stloc (mb, end_var);
903 mono_mb_emit_ldloc (mb, my_entry_var);
904 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
905 mono_mb_emit_byte (mb, MONO_CEE_ADD);
906 mono_mb_emit_stloc (mb, start_var);
910 * } while (start < end);
912 start_loop = mono_mb_get_label (mb);
913 mono_mb_emit_ldloc (mb, start_var);
914 mono_mb_emit_icon (mb, 0);
915 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
916 mono_mb_emit_ldloc (mb, start_var);
917 mono_mb_emit_icon (mb, sizeof (gpointer));
918 mono_mb_emit_byte (mb, MONO_CEE_ADD);
919 mono_mb_emit_stloc (mb, start_var);
921 mono_mb_emit_ldloc (mb, start_var);
922 mono_mb_emit_ldloc (mb, end_var);
923 mono_mb_emit_byte (mb, MONO_CEE_BLT_UN_S);
924 mono_mb_emit_byte (mb, start_loop - (mono_mb_get_label (mb) + 1));
925 } else if (atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING) {
926 /* need to clear just the sync pointer */
927 mono_mb_emit_ldloc (mb, my_entry_var);
928 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
929 mono_mb_emit_byte (mb, MONO_CEE_ADD);
930 mono_mb_emit_icon (mb, 0);
931 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
934 if (atype == ATYPE_STRING) {
935 /* need to set length and clear the last char */
936 /* s->length = len; */
937 mono_mb_emit_ldloc (mb, my_entry_var);
938 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, length));
939 mono_mb_emit_byte (mb, MONO_CEE_ADD);
940 mono_mb_emit_ldarg (mb, 1);
941 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
942 /* s->chars [len] = 0; */
943 mono_mb_emit_ldloc (mb, my_entry_var);
944 mono_mb_emit_ldloc (mb, bytes_var);
945 mono_mb_emit_icon (mb, 2);
946 mono_mb_emit_byte (mb, MONO_CEE_SUB);
947 mono_mb_emit_byte (mb, MONO_CEE_ADD);
948 mono_mb_emit_icon (mb, 0);
949 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
952 /* return my_entry; */
953 mono_mb_emit_ldloc (mb, my_entry_var);
954 mono_mb_emit_byte (mb, MONO_CEE_RET);
956 mono_mb_patch_short_branch (mb, no_freelist_branch);
957 if (not_small_enough_branch > 0)
958 mono_mb_patch_short_branch (mb, not_small_enough_branch);
959 if (size_overflow_branch > 0)
960 mono_mb_patch_short_branch (mb, size_overflow_branch);
961 /* the slow path: we just call back into the runtime */
962 if (atype == ATYPE_STRING) {
963 mono_mb_emit_ldarg (mb, 1);
964 mono_mb_emit_icall (mb, mono_string_alloc);
966 mono_mb_emit_ldarg (mb, 0);
967 mono_mb_emit_icall (mb, mono_object_new_specific);
970 mono_mb_emit_byte (mb, MONO_CEE_RET);
972 res = mono_mb_create_method (mb, csig, 8);
974 mono_method_get_header (res)->init_locals = FALSE;
976 info = mono_image_alloc0 (mono_defaults.corlib, sizeof (AllocatorWrapperInfo));
977 info->gc_name = "boehm";
978 info->alloc_type = atype;
979 mono_marshal_set_wrapper_info (res, info);
984 static MonoMethod* alloc_method_cache [ATYPE_NUM];
986 static G_GNUC_UNUSED gboolean
987 mono_gc_is_critical_method (MonoMethod *method)
991 for (i = 0; i < ATYPE_NUM; ++i)
992 if (method == alloc_method_cache [i])
999 * If possible, generate a managed method that can quickly allocate objects in class
1000 * @klass. The method will typically have an thread-local inline allocation sequence.
1001 * The signature of the called method is:
1002 * object allocate (MonoVTable *vtable)
1003 * Some of the logic here is similar to mono_class_get_allocation_ftn () i object.c,
1005 * The thread local alloc logic is taken from libgc/pthread_support.c.
1009 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
1013 MonoClass *klass = vtable->klass;
1014 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
1016 /*g_print ("thread tls: %d\n", offset);*/
1019 if (!SMALL_ENOUGH (klass->instance_size))
1021 if (mono_class_has_finalizer (klass) || klass->marshalbyref || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
1025 if (klass->byval_arg.type == MONO_TYPE_STRING) {
1026 atype = ATYPE_STRING;
1027 } else if (!klass->has_references) {
1029 atype = ATYPE_FREEPTR_FOR_BOX;
1031 atype = ATYPE_FREEPTR;
1035 * disabled because we currently do a runtime choice anyway, to
1036 * deal with multiple appdomains.
1037 if (vtable->gc_descr != GC_NO_DESCRIPTOR)
1040 atype = ATYPE_NORMAL;
1043 return mono_gc_get_managed_allocator_by_type (atype);
1047 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
1053 * mono_gc_get_managed_allocator_by_type:
1055 * Return a managed allocator method corresponding to allocator type ATYPE.
1058 mono_gc_get_managed_allocator_by_type (int atype)
1062 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
1064 mono_loader_lock ();
1065 res = alloc_method_cache [atype];
1067 res = alloc_method_cache [atype] = create_allocator (atype, offset);
1068 mono_loader_unlock ();
1073 mono_gc_get_managed_allocator_types (void)
1079 mono_gc_get_write_barrier (void)
1081 g_assert_not_reached ();
1087 static G_GNUC_UNUSED gboolean
1088 mono_gc_is_critical_method (MonoMethod *method)
1094 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
1100 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
1106 mono_gc_get_managed_allocator_by_type (int atype)
1112 mono_gc_get_managed_allocator_types (void)
1118 mono_gc_get_write_barrier (void)
1120 g_assert_not_reached ();
1127 mono_gc_get_gc_name (void)
1133 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
1135 return GC_call_with_alloc_lock (func, data);
1139 mono_gc_get_description (void)
1141 return g_strdup (DEFAULT_GC_NAME);
1145 mono_gc_set_desktop_mode (void)
1151 mono_gc_is_moving (void)
1157 mono_gc_is_disabled (void)
1159 if (GC_dont_gc || g_getenv ("GC_DONT_GC"))
1166 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
1168 g_assert_not_reached ();
1173 mono_gc_get_card_table (int *shift_bits, gpointer *card_mask)
1175 g_assert_not_reached ();
1180 mono_gc_get_nursery (int *shift_bits, size_t *size)
1186 mono_gc_set_current_thread_appdomain (MonoDomain *domain)
1191 mono_gc_precise_stack_mark_enabled (void)
1197 mono_gc_get_logfile (void)
1203 mono_gc_conservatively_scan_area (void *start, void *end)
1205 g_assert_not_reached ();
1209 mono_gc_scan_object (void *obj)
1211 g_assert_not_reached ();
1216 mono_gc_get_bitmap_for_descr (void *descr, int *numbits)
1218 g_assert_not_reached ();
1223 mono_gc_set_gc_callbacks (MonoGCCallbacks *callbacks)
1228 mono_gc_set_stack_end (void *stack_end)
1232 void mono_gc_set_skip_thread (gboolean value)
1237 * These will call the redefined versions in libgc.
1243 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
1245 return pthread_create (new_thread, attr, start_routine, arg);
1249 mono_gc_pthread_join (pthread_t thread, void **retval)
1251 return pthread_join (thread, retval);
1255 mono_gc_pthread_detach (pthread_t thread)
1257 return pthread_detach (thread);
1261 mono_gc_pthread_exit (void *retval)
1263 pthread_exit (retval);
1269 BOOL APIENTRY mono_gc_dllmain (HMODULE module_handle, DWORD reason, LPVOID reserved)
1271 #ifdef USE_INCLUDED_LIBGC
1272 return GC_DllMain (module_handle, reason, reserved);
1280 mono_gc_get_vtable_bits (MonoClass *class)
1286 * mono_gc_register_altstack:
1288 * Register the dimensions of the normal stack and altstack with the collector.
1289 * Currently, STACK/STACK_SIZE is only used when the thread is suspended while it is on an altstack.
1292 mono_gc_register_altstack (gpointer stack, gint32 stack_size, gpointer altstack, gint32 altstack_size)
1294 #ifdef USE_INCLUDED_LIBGC
1295 GC_register_altstack (stack, stack_size, altstack, altstack_size);
1300 mono_gc_get_los_limit (void)
1306 mono_gc_user_markers_supported (void)
1312 mono_gc_make_root_descr_user (MonoGCRootMarkFunc marker)
1314 g_assert_not_reached ();
1318 #endif /* no Boehm GC */