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 2004-2009 Novell, Inc (http://www.novell.com)
12 #define GC_I_HIDE_POINTERS
13 #include <mono/metadata/gc-internal.h>
14 #include <mono/metadata/mono-gc.h>
15 #include <mono/metadata/gc-internal.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/utils/mono-logger-internal.h>
24 #include <mono/utils/mono-time.h>
25 #include <mono/utils/dtrace.h>
26 #include <mono/utils/gc_wrapper.h>
30 #ifdef USE_INCLUDED_LIBGC
33 #define THREAD_LOCAL_ALLOC 1
34 #include "private/pthread_support.h"
37 #define GC_NO_DESCRIPTOR ((gpointer)(0 | GC_DS_LENGTH))
39 static gboolean gc_initialized = FALSE;
42 mono_gc_warning (char *msg, GC_word arg)
44 mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_GC, msg, (unsigned long)arg);
48 mono_gc_base_init (void)
54 * Handle the case when we are called from a thread different from the main thread,
56 * FIXME: Move this to libgc where it belongs.
58 * we used to do this only when running on valgrind,
59 * but it happens also in other setups.
61 #if defined(HAVE_PTHREAD_GETATTR_NP) && defined(HAVE_PTHREAD_ATTR_GETSTACK)
66 pthread_getattr_np (pthread_self (), &attr);
67 pthread_attr_getstack (&attr, &sstart, &size);
68 pthread_attr_destroy (&attr);
69 /*g_print ("stackbottom pth is: %p\n", (char*)sstart + size);*/
72 * The calculation above doesn't seem to work on ia64, also we need to set
73 * GC_register_stackbottom as well, but don't know how.
76 /* apparently with some linuxthreads implementations sstart can be NULL,
77 * fallback to the more imprecise method (bug# 78096).
80 GC_stackbottom = (char*)sstart + size;
83 gsize stack_bottom = (gsize)&dummy;
85 stack_bottom &= ~4095;
86 GC_stackbottom = (char*)stack_bottom;
90 #elif defined(HAVE_PTHREAD_GET_STACKSIZE_NP) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
91 GC_stackbottom = (char*)pthread_get_stackaddr_np (pthread_self ());
92 #elif defined(__OpenBSD__)
93 # include <pthread_np.h>
98 rslt = pthread_stackseg_np(pthread_self(), &ss);
101 GC_stackbottom = (char*)ss.ss_sp;
106 gsize stack_bottom = (gsize)&dummy;
107 stack_bottom += 4095;
108 stack_bottom &= ~4095;
109 /*g_print ("stackbottom is: %p\n", (char*)stack_bottom);*/
110 GC_stackbottom = (char*)stack_bottom;
114 #if !defined(PLATFORM_ANDROID)
115 /* If GC_no_dls is set to true, GC_find_limit is not called. This causes a seg fault on Android. */
119 GC_oom_fn = mono_gc_out_of_memory;
120 GC_set_warn_proc (mono_gc_warning);
121 GC_finalize_on_demand = 1;
122 GC_finalizer_notifier = mono_gc_finalize_notify;
124 #ifdef HAVE_GC_GCJ_MALLOC
125 GC_init_gcj_malloc (5, NULL);
127 mono_gc_enable_events ();
128 gc_initialized = TRUE;
132 mono_gc_collect (int generation)
134 MONO_PROBE_GC_BEGIN (generation);
136 mono_perfcounters->gc_induced++;
139 MONO_PROBE_GC_END (generation);
140 #if defined(ENABLE_DTRACE) && defined(__sun__)
141 /* This works around a dtrace -G problem on Solaris.
142 Limit its actual use to when the probe is enabled. */
143 if (MONO_PROBE_GC_END_ENABLED ())
149 mono_gc_max_generation (void)
155 mono_gc_get_generation (MonoObject *object)
161 mono_gc_collection_count (int generation)
167 mono_gc_add_memory_pressure (gint64 value)
172 mono_gc_get_used_size (void)
174 return GC_get_heap_size () - GC_get_free_bytes ();
178 mono_gc_get_heap_size (void)
180 return GC_get_heap_size ();
184 mono_gc_disable (void)
186 #ifdef HAVE_GC_ENABLE
189 g_assert_not_reached ();
194 mono_gc_enable (void)
196 #ifdef HAVE_GC_ENABLE
199 g_assert_not_reached ();
204 mono_gc_is_gc_thread (void)
206 #if GC_VERSION_MAJOR >= 7
208 #elif defined(USE_INCLUDED_LIBGC)
209 return GC_thread_is_registered ();
215 extern int GC_thread_register_foreign (void *base_addr);
218 mono_gc_register_thread (void *baseptr)
220 #if GC_VERSION_MAJOR >= 7
221 struct GC_stack_base sb;
224 res = GC_get_stack_base (&sb);
225 if (res != GC_SUCCESS) {
226 sb.mem_base = baseptr;
228 /* Can't determine the register stack bounds */
229 g_error ("mono_gc_register_thread failed ().\n");
232 res = GC_register_my_thread (&sb);
233 if ((res != GC_SUCCESS) && (res != GC_DUPLICATE)) {
234 g_warning ("GC_register_my_thread () failed.\n");
239 if (mono_gc_is_gc_thread())
241 #if defined(USE_INCLUDED_LIBGC) && !defined(HOST_WIN32)
242 return GC_thread_register_foreign (baseptr);
250 mono_object_is_alive (MonoObject* o)
252 #ifdef USE_INCLUDED_LIBGC
253 return GC_is_marked ((gpointer)o);
259 #ifdef USE_INCLUDED_LIBGC
261 static gint64 gc_start_time;
264 on_gc_notification (GCEventType event)
266 if (event == MONO_GC_EVENT_START) {
267 mono_perfcounters->gc_collections0++;
268 mono_stats.major_gc_count ++;
269 gc_start_time = mono_100ns_ticks ();
270 } else if (event == MONO_GC_EVENT_END) {
271 guint64 heap_size = GC_get_heap_size ();
272 guint64 used_size = heap_size - GC_get_free_bytes ();
273 mono_perfcounters->gc_total_bytes = used_size;
274 mono_perfcounters->gc_committed_bytes = heap_size;
275 mono_perfcounters->gc_reserved_bytes = heap_size;
276 mono_perfcounters->gc_gen0size = heap_size;
277 mono_stats.major_gc_time_usecs += (mono_100ns_ticks () - gc_start_time) / 10;
278 mono_trace_message (MONO_TRACE_GC, "gc took %d usecs", (mono_100ns_ticks () - gc_start_time) / 10);
280 mono_profiler_gc_event ((MonoGCEvent) event, 0);
284 on_gc_heap_resize (size_t new_size)
286 guint64 heap_size = GC_get_heap_size ();
287 mono_perfcounters->gc_committed_bytes = heap_size;
288 mono_perfcounters->gc_reserved_bytes = heap_size;
289 mono_perfcounters->gc_gen0size = heap_size;
290 mono_profiler_gc_heap_resize (new_size);
294 mono_gc_enable_events (void)
296 GC_notify_event = on_gc_notification;
297 GC_on_heap_resize = on_gc_heap_resize;
303 mono_gc_enable_events (void)
310 mono_gc_register_root (char *start, size_t size, void *descr)
312 /* for some strange reason, they want one extra byte on the end */
313 GC_add_roots (start, start + size + 1);
319 mono_gc_deregister_root (char* addr)
322 /* FIXME: libgc doesn't define this work win32 for some reason */
323 /* FIXME: No size info */
324 GC_remove_roots (addr, addr + sizeof (gpointer) + 1);
329 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
331 /* libgc requires that we use HIDE_POINTER... */
332 *link_addr = (void*)HIDE_POINTER (obj);
333 GC_GENERAL_REGISTER_DISAPPEARING_LINK (link_addr, obj);
337 mono_gc_weak_link_remove (void **link_addr)
339 GC_unregister_disappearing_link (link_addr);
344 reveal_link (gpointer link_addr)
346 void **link_a = link_addr;
347 return REVEAL_POINTER (*link_a);
351 mono_gc_weak_link_get (void **link_addr)
353 MonoObject *obj = GC_call_with_alloc_lock (reveal_link, link_addr);
354 if (obj == (MonoObject *) -1)
360 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
362 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
366 mono_gc_make_descr_for_object (gsize *bitmap, int numbits, size_t obj_size)
368 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
372 mono_gc_make_descr_for_array (int vector, gsize *elem_bitmap, int numbits, size_t elem_size)
374 /* libgc has no usable support for arrays... */
375 return GC_NO_DESCRIPTOR;
379 mono_gc_make_descr_from_bitmap (gsize *bitmap, int numbits)
381 #ifdef HAVE_GC_GCJ_MALLOC
382 /* It seems there are issues when the bitmap doesn't fit: play it safe */
384 return GC_NO_DESCRIPTOR;
386 return (gpointer)GC_make_descriptor ((GC_bitmap)bitmap, numbits);
393 mono_gc_alloc_fixed (size_t size, void *descr)
395 /* To help track down typed allocation bugs */
399 if (count == atoi (getenv ("COUNT2")))
401 if (count > atoi (getenv ("COUNT2")))
402 return GC_MALLOC (size);
406 return GC_MALLOC_EXPLICITLY_TYPED (size, (GC_descr)descr);
408 return GC_MALLOC (size);
412 mono_gc_free_fixed (void* addr)
417 mono_gc_invoke_finalizers (void)
419 /* There is a bug in GC_invoke_finalizer () in versions <= 6.2alpha4:
420 * the 'mem_freed' variable is not initialized when there are no
421 * objects to finalize, which leads to strange behavior later on.
422 * The check is necessary to work around that bug.
424 if (GC_should_invoke_finalizers ())
425 return GC_invoke_finalizers ();
430 mono_gc_pending_finalizers (void)
432 return GC_should_invoke_finalizers ();
436 * LOCKING: Assumes the domain_finalizers lock is held.
439 add_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
443 if (!domain->track_resurrection_objects_hash)
444 domain->track_resurrection_objects_hash = g_hash_table_new (mono_aligned_addr_hash, NULL);
446 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
447 refs = g_slist_prepend (refs, GUINT_TO_POINTER (gchandle));
448 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
452 mono_gc_add_weak_track_handle (MonoObject *obj, guint32 handle)
459 domain = mono_object_get_domain (obj);
461 mono_domain_finalizers_lock (domain);
463 add_weak_track_handle_internal (domain, obj, handle);
465 g_hash_table_insert (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (handle), obj);
467 mono_domain_finalizers_unlock (domain);
471 * LOCKING: Assumes the domain_finalizers lock is held.
474 remove_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
478 if (!domain->track_resurrection_objects_hash)
481 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
482 refs = g_slist_remove (refs, GUINT_TO_POINTER (gchandle));
483 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
487 mono_gc_change_weak_track_handle (MonoObject *old_obj, MonoObject *obj, guint32 gchandle)
489 MonoDomain *domain = mono_domain_get ();
491 mono_domain_finalizers_lock (domain);
494 remove_weak_track_handle_internal (domain, old_obj, gchandle);
496 add_weak_track_handle_internal (domain, obj, gchandle);
498 mono_domain_finalizers_unlock (domain);
502 mono_gc_remove_weak_track_handle (guint32 gchandle)
504 MonoDomain *domain = mono_domain_get ();
507 /* Clean our entries in the two hashes in MonoDomain */
509 mono_domain_finalizers_lock (domain);
511 /* Get the original object this handle pointed to */
512 obj = g_hash_table_lookup (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
514 g_hash_table_remove (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
516 remove_weak_track_handle_internal (domain, obj, gchandle);
519 mono_domain_finalizers_unlock (domain);
523 mono_gc_remove_weak_track_object (MonoDomain *domain, MonoObject *obj)
527 if (domain->track_resurrection_objects_hash) {
528 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
532 * Since we don't run finalizers again for resurrected objects,
533 * no need to keep these around.
535 g_hash_table_remove (domain->track_resurrection_objects_hash, obj);
542 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
544 *(void**)field_ptr = value;
548 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
550 *(void**)slot_ptr = value;
554 mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
556 memmove (dest_ptr, src_ptr, count * sizeof (gpointer));
560 mono_gc_wbarrier_generic_store (gpointer ptr, MonoObject* value)
562 *(void**)ptr = value;
566 mono_gc_wbarrier_generic_nostore (gpointer ptr)
571 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
573 memmove (dest, src, count * mono_class_value_size (klass, NULL));
577 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
579 /* do not copy the sync state */
580 memcpy ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
581 mono_object_class (obj)->instance_size - sizeof (MonoObject));
585 mono_gc_clear_domain (MonoDomain *domain)
590 mono_gc_get_suspend_signal (void)
592 #ifdef USE_INCLUDED_GC
593 return GC_get_suspend_signal ();
599 #if defined(USE_INCLUDED_LIBGC) && defined(USE_COMPILER_TLS) && defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
600 extern __thread MONO_TLS_FAST void* GC_thread_tls;
601 #include "metadata-internals.h"
607 while (!(v & (1 << i)))
614 ATYPE_FREEPTR_FOR_BOX,
622 create_allocator (int atype, int offset)
624 int index_var, bytes_var, my_fl_var, my_entry_var;
625 guint32 no_freelist_branch, not_small_enough_branch = 0;
626 guint32 size_overflow_branch = 0;
627 MonoMethodBuilder *mb;
629 MonoMethodSignature *csig;
630 AllocatorWrapperInfo *info;
632 if (atype == ATYPE_STRING) {
633 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
634 csig->ret = &mono_defaults.string_class->byval_arg;
635 csig->params [0] = &mono_defaults.int_class->byval_arg;
636 csig->params [1] = &mono_defaults.int32_class->byval_arg;
638 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
639 csig->ret = &mono_defaults.object_class->byval_arg;
640 csig->params [0] = &mono_defaults.int_class->byval_arg;
643 mb = mono_mb_new (mono_defaults.object_class, "Alloc", MONO_WRAPPER_ALLOC);
644 bytes_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
645 if (atype == ATYPE_STRING) {
646 /* a string alloator method takes the args: (vtable, len) */
647 /* bytes = (sizeof (MonoString) + ((len + 1) * 2)); */
648 mono_mb_emit_ldarg (mb, 1);
649 mono_mb_emit_icon (mb, 1);
650 mono_mb_emit_byte (mb, MONO_CEE_ADD);
651 mono_mb_emit_icon (mb, 1);
652 mono_mb_emit_byte (mb, MONO_CEE_SHL);
653 // sizeof (MonoString) might include padding
654 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, chars));
655 mono_mb_emit_byte (mb, MONO_CEE_ADD);
656 mono_mb_emit_stloc (mb, bytes_var);
658 /* bytes = vtable->klass->instance_size */
659 mono_mb_emit_ldarg (mb, 0);
660 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoVTable, klass));
661 mono_mb_emit_byte (mb, MONO_CEE_ADD);
662 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
663 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoClass, instance_size));
664 mono_mb_emit_byte (mb, MONO_CEE_ADD);
665 /* FIXME: assert instance_size stays a 4 byte integer */
666 mono_mb_emit_byte (mb, MONO_CEE_LDIND_U4);
667 mono_mb_emit_stloc (mb, bytes_var);
670 /* this is needed for strings/arrays only as the other big types are never allocated with this method */
671 if (atype == ATYPE_STRING) {
673 /* if (!SMALL_ENOUGH (bytes)) jump slow_path;*/
674 mono_mb_emit_ldloc (mb, bytes_var);
675 mono_mb_emit_icon (mb, (NFREELISTS-1) * GRANULARITY);
676 not_small_enough_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
677 /* check for overflow */
678 mono_mb_emit_ldloc (mb, bytes_var);
679 mono_mb_emit_icon (mb, sizeof (MonoString));
680 size_overflow_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
683 /* int index = INDEX_FROM_BYTES(bytes); */
684 index_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
686 mono_mb_emit_ldloc (mb, bytes_var);
687 mono_mb_emit_icon (mb, GRANULARITY - 1);
688 mono_mb_emit_byte (mb, MONO_CEE_ADD);
689 mono_mb_emit_icon (mb, shift_amount (GRANULARITY));
690 mono_mb_emit_byte (mb, MONO_CEE_SHR_UN);
691 mono_mb_emit_icon (mb, shift_amount (sizeof (gpointer)));
692 mono_mb_emit_byte (mb, MONO_CEE_SHL);
693 /* index var is already adjusted into bytes */
694 mono_mb_emit_stloc (mb, index_var);
696 my_fl_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
697 my_entry_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
698 /* my_fl = ((GC_thread)tsd) -> ptrfree_freelists + index; */
699 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
700 mono_mb_emit_byte (mb, 0x0D); /* CEE_MONO_TLS */
701 mono_mb_emit_i4 (mb, offset);
702 if (atype == ATYPE_FREEPTR || atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING)
703 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, ptrfree_freelists));
704 else if (atype == ATYPE_NORMAL)
705 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, normal_freelists));
706 else if (atype == ATYPE_GCJ)
707 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, gcj_freelists));
709 g_assert_not_reached ();
710 mono_mb_emit_byte (mb, MONO_CEE_ADD);
711 mono_mb_emit_ldloc (mb, index_var);
712 mono_mb_emit_byte (mb, MONO_CEE_ADD);
713 mono_mb_emit_stloc (mb, my_fl_var);
715 /* my_entry = *my_fl; */
716 mono_mb_emit_ldloc (mb, my_fl_var);
717 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
718 mono_mb_emit_stloc (mb, my_entry_var);
720 /* if (EXPECT((word)my_entry >= HBLKSIZE, 1)) { */
721 mono_mb_emit_ldloc (mb, my_entry_var);
722 mono_mb_emit_icon (mb, HBLKSIZE);
723 no_freelist_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
725 /* ptr_t next = obj_link(my_entry); *my_fl = next; */
726 mono_mb_emit_ldloc (mb, my_fl_var);
727 mono_mb_emit_ldloc (mb, my_entry_var);
728 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
729 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
731 /* set the vtable and clear the words in the object */
732 mono_mb_emit_ldloc (mb, my_entry_var);
733 mono_mb_emit_ldarg (mb, 0);
734 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
736 if (atype == ATYPE_FREEPTR) {
737 int start_var, end_var, start_loop;
738 /* end = my_entry + bytes; start = my_entry + sizeof (gpointer);
740 start_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
741 end_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
742 mono_mb_emit_ldloc (mb, my_entry_var);
743 mono_mb_emit_ldloc (mb, bytes_var);
744 mono_mb_emit_byte (mb, MONO_CEE_ADD);
745 mono_mb_emit_stloc (mb, end_var);
746 mono_mb_emit_ldloc (mb, my_entry_var);
747 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
748 mono_mb_emit_byte (mb, MONO_CEE_ADD);
749 mono_mb_emit_stloc (mb, start_var);
753 * } while (start < end);
755 start_loop = mono_mb_get_label (mb);
756 mono_mb_emit_ldloc (mb, start_var);
757 mono_mb_emit_icon (mb, 0);
758 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
759 mono_mb_emit_ldloc (mb, start_var);
760 mono_mb_emit_icon (mb, sizeof (gpointer));
761 mono_mb_emit_byte (mb, MONO_CEE_ADD);
762 mono_mb_emit_stloc (mb, start_var);
764 mono_mb_emit_ldloc (mb, start_var);
765 mono_mb_emit_ldloc (mb, end_var);
766 mono_mb_emit_byte (mb, MONO_CEE_BLT_UN_S);
767 mono_mb_emit_byte (mb, start_loop - (mono_mb_get_label (mb) + 1));
768 } else if (atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING) {
769 /* need to clear just the sync pointer */
770 mono_mb_emit_ldloc (mb, my_entry_var);
771 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
772 mono_mb_emit_byte (mb, MONO_CEE_ADD);
773 mono_mb_emit_icon (mb, 0);
774 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
777 if (atype == ATYPE_STRING) {
778 /* need to set length and clear the last char */
779 /* s->length = len; */
780 mono_mb_emit_ldloc (mb, my_entry_var);
781 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, length));
782 mono_mb_emit_byte (mb, MONO_CEE_ADD);
783 mono_mb_emit_ldarg (mb, 1);
784 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
785 /* s->chars [len] = 0; */
786 mono_mb_emit_ldloc (mb, my_entry_var);
787 mono_mb_emit_ldloc (mb, bytes_var);
788 mono_mb_emit_icon (mb, 2);
789 mono_mb_emit_byte (mb, MONO_CEE_SUB);
790 mono_mb_emit_byte (mb, MONO_CEE_ADD);
791 mono_mb_emit_icon (mb, 0);
792 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
795 /* return my_entry; */
796 mono_mb_emit_ldloc (mb, my_entry_var);
797 mono_mb_emit_byte (mb, MONO_CEE_RET);
799 mono_mb_patch_short_branch (mb, no_freelist_branch);
800 if (not_small_enough_branch > 0)
801 mono_mb_patch_short_branch (mb, not_small_enough_branch);
802 if (size_overflow_branch > 0)
803 mono_mb_patch_short_branch (mb, size_overflow_branch);
804 /* the slow path: we just call back into the runtime */
805 if (atype == ATYPE_STRING) {
806 mono_mb_emit_ldarg (mb, 1);
807 mono_mb_emit_icall (mb, mono_string_alloc);
809 mono_mb_emit_ldarg (mb, 0);
810 mono_mb_emit_icall (mb, mono_object_new_specific);
813 mono_mb_emit_byte (mb, MONO_CEE_RET);
815 res = mono_mb_create_method (mb, csig, 8);
817 mono_method_get_header (res)->init_locals = FALSE;
819 info = mono_image_alloc0 (mono_defaults.corlib, sizeof (AllocatorWrapperInfo));
820 info->gc_name = "boehm";
821 info->alloc_type = atype;
822 mono_marshal_set_wrapper_info (res, info);
827 static MonoMethod* alloc_method_cache [ATYPE_NUM];
830 * If possible, generate a managed method that can quickly allocate objects in class
831 * @klass. The method will typically have an thread-local inline allocation sequence.
832 * The signature of the called method is:
833 * object allocate (MonoVTable *vtable)
834 * Some of the logic here is similar to mono_class_get_allocation_ftn () i object.c,
836 * The thread local alloc logic is taken from libgc/pthread_support.c.
840 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
844 MonoClass *klass = vtable->klass;
845 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
847 /*g_print ("thread tls: %d\n", offset);*/
850 if (!SMALL_ENOUGH (klass->instance_size))
852 if (klass->has_finalize || klass->marshalbyref || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
856 if (klass->byval_arg.type == MONO_TYPE_STRING) {
857 atype = ATYPE_STRING;
858 } else if (!klass->has_references) {
860 atype = ATYPE_FREEPTR_FOR_BOX;
862 atype = ATYPE_FREEPTR;
866 * disabled because we currently do a runtime choice anyway, to
867 * deal with multiple appdomains.
868 if (vtable->gc_descr != GC_NO_DESCRIPTOR)
871 atype = ATYPE_NORMAL;
874 return mono_gc_get_managed_allocator_by_type (atype);
878 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
884 * mono_gc_get_managed_allocator_by_type:
886 * Return a managed allocator method corresponding to allocator type ATYPE.
889 mono_gc_get_managed_allocator_by_type (int atype)
893 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
896 res = alloc_method_cache [atype];
898 res = alloc_method_cache [atype] = create_allocator (atype, offset);
899 mono_loader_unlock ();
904 mono_gc_get_managed_allocator_types (void)
910 mono_gc_get_write_barrier (void)
912 g_assert_not_reached ();
919 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
925 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
931 mono_gc_get_managed_allocator_by_type (int atype)
937 mono_gc_get_managed_allocator_types (void)
943 mono_gc_get_write_barrier (void)
945 g_assert_not_reached ();
952 mono_gc_get_gc_name (void)
958 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
960 return GC_call_with_alloc_lock (func, data);
964 mono_gc_get_description (void)
966 return g_strdup (DEFAULT_GC_NAME);
970 mono_gc_set_desktop_mode (void)
976 mono_gc_is_moving (void)
982 mono_gc_is_disabled (void)
984 if (GC_dont_gc || g_getenv ("GC_DONT_GC"))
991 mono_gc_wbarrier_value_copy_bitmap (gpointer _dest, gpointer _src, int size, unsigned bitmap)
993 g_assert_not_reached ();
997 * These will call the redefined versions in libgc.
1003 mono_gc_pthread_create (pthread_t *new_thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg)
1005 return pthread_create (new_thread, attr, start_routine, arg);
1009 mono_gc_pthread_join (pthread_t thread, void **retval)
1011 return pthread_join (thread, retval);
1015 mono_gc_pthread_detach (pthread_t thread)
1017 return pthread_detach (thread);
1022 #endif /* no Boehm GC */