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>
29 #ifdef USE_INCLUDED_LIBGC
32 #define THREAD_LOCAL_ALLOC 1
33 #include "private/pthread_support.h"
36 #define GC_NO_DESCRIPTOR ((gpointer)(0 | GC_DS_LENGTH))
38 static gboolean gc_initialized = FALSE;
41 mono_gc_warning (char *msg, GC_word arg)
43 mono_trace (G_LOG_LEVEL_WARNING, MONO_TRACE_GC, msg, (unsigned long)arg);
47 mono_gc_base_init (void)
53 * Handle the case when we are called from a thread different from the main thread,
55 * FIXME: Move this to libgc where it belongs.
57 * we used to do this only when running on valgrind,
58 * but it happens also in other setups.
60 #if defined(HAVE_PTHREAD_GETATTR_NP) && defined(HAVE_PTHREAD_ATTR_GETSTACK)
65 pthread_getattr_np (pthread_self (), &attr);
66 pthread_attr_getstack (&attr, &sstart, &size);
67 pthread_attr_destroy (&attr);
68 /*g_print ("stackbottom pth is: %p\n", (char*)sstart + size);*/
71 * The calculation above doesn't seem to work on ia64, also we need to set
72 * GC_register_stackbottom as well, but don't know how.
75 /* apparently with some linuxthreads implementations sstart can be NULL,
76 * fallback to the more imprecise method (bug# 78096).
79 GC_stackbottom = (char*)sstart + size;
82 gsize stack_bottom = (gsize)&dummy;
84 stack_bottom &= ~4095;
85 GC_stackbottom = (char*)stack_bottom;
89 #elif defined(HAVE_PTHREAD_GET_STACKSIZE_NP) && defined(HAVE_PTHREAD_GET_STACKADDR_NP)
90 GC_stackbottom = (char*)pthread_get_stackaddr_np (pthread_self ());
91 #elif defined(__OpenBSD__)
92 # include <pthread_np.h>
97 rslt = pthread_stackseg_np(pthread_self(), &ss);
100 GC_stackbottom = (char*)ss.ss_sp;
105 gsize stack_bottom = (gsize)&dummy;
106 stack_bottom += 4095;
107 stack_bottom &= ~4095;
108 /*g_print ("stackbottom is: %p\n", (char*)stack_bottom);*/
109 GC_stackbottom = (char*)stack_bottom;
113 #if !defined(PLATFORM_ANDROID)
114 /* If GC_no_dls is set to true, GC_find_limit is not called. This causes a seg fault on Android. */
118 GC_oom_fn = mono_gc_out_of_memory;
119 GC_set_warn_proc (mono_gc_warning);
120 GC_finalize_on_demand = 1;
121 GC_finalizer_notifier = mono_gc_finalize_notify;
123 #ifdef HAVE_GC_GCJ_MALLOC
124 GC_init_gcj_malloc (5, NULL);
126 mono_gc_enable_events ();
127 gc_initialized = TRUE;
131 mono_gc_collect (int generation)
133 MONO_PROBE_GC_BEGIN (generation);
135 mono_perfcounters->gc_induced++;
138 MONO_PROBE_GC_END (generation);
139 #if defined(ENABLE_DTRACE) && defined(__sun__)
140 /* This works around a dtrace -G problem on Solaris.
141 Limit its actual use to when the probe is enabled. */
142 if (MONO_PROBE_GC_END_ENABLED ())
148 mono_gc_max_generation (void)
154 mono_gc_get_generation (MonoObject *object)
160 mono_gc_collection_count (int generation)
166 mono_gc_add_memory_pressure (gint64 value)
171 mono_gc_get_used_size (void)
173 return GC_get_heap_size () - GC_get_free_bytes ();
177 mono_gc_get_heap_size (void)
179 return GC_get_heap_size ();
183 mono_gc_disable (void)
185 #ifdef HAVE_GC_ENABLE
188 g_assert_not_reached ();
193 mono_gc_enable (void)
195 #ifdef HAVE_GC_ENABLE
198 g_assert_not_reached ();
203 mono_gc_is_gc_thread (void)
205 #if GC_VERSION_MAJOR >= 7
207 #elif defined(USE_INCLUDED_LIBGC)
208 return GC_thread_is_registered ();
214 extern int GC_thread_register_foreign (void *base_addr);
217 mono_gc_register_thread (void *baseptr)
219 #if GC_VERSION_MAJOR >= 7
220 struct GC_stack_base sb;
223 res = GC_get_stack_base (&sb);
224 if (res != GC_SUCCESS) {
225 sb.mem_base = baseptr;
227 /* Can't determine the register stack bounds */
228 g_error ("mono_gc_register_thread failed ().\n");
231 res = GC_register_my_thread (&sb);
232 if ((res != GC_SUCCESS) && (res != GC_DUPLICATE)) {
233 g_warning ("GC_register_my_thread () failed.\n");
238 if (mono_gc_is_gc_thread())
240 #if defined(USE_INCLUDED_LIBGC) && !defined(HOST_WIN32)
241 return GC_thread_register_foreign (baseptr);
249 mono_object_is_alive (MonoObject* o)
251 #ifdef USE_INCLUDED_LIBGC
252 return GC_is_marked ((gpointer)o);
258 #ifdef USE_INCLUDED_LIBGC
260 static gint64 gc_start_time;
263 on_gc_notification (GCEventType event)
265 if (event == MONO_GC_EVENT_START) {
266 mono_perfcounters->gc_collections0++;
267 mono_stats.major_gc_count ++;
268 gc_start_time = mono_100ns_ticks ();
269 } else if (event == MONO_GC_EVENT_END) {
270 guint64 heap_size = GC_get_heap_size ();
271 guint64 used_size = heap_size - GC_get_free_bytes ();
272 mono_perfcounters->gc_total_bytes = used_size;
273 mono_perfcounters->gc_committed_bytes = heap_size;
274 mono_perfcounters->gc_reserved_bytes = heap_size;
275 mono_perfcounters->gc_gen0size = heap_size;
276 mono_stats.major_gc_time_usecs += (mono_100ns_ticks () - gc_start_time) / 10;
277 mono_trace_message (MONO_TRACE_GC, "gc took %d usecs", (mono_100ns_ticks () - gc_start_time) / 10);
279 mono_profiler_gc_event ((MonoGCEvent) event, 0);
283 on_gc_heap_resize (size_t new_size)
285 guint64 heap_size = GC_get_heap_size ();
286 mono_perfcounters->gc_committed_bytes = heap_size;
287 mono_perfcounters->gc_reserved_bytes = heap_size;
288 mono_perfcounters->gc_gen0size = heap_size;
289 mono_profiler_gc_heap_resize (new_size);
293 mono_gc_enable_events (void)
295 GC_notify_event = on_gc_notification;
296 GC_on_heap_resize = on_gc_heap_resize;
302 mono_gc_enable_events (void)
309 mono_gc_register_root (char *start, size_t size, void *descr)
311 /* for some strange reason, they want one extra byte on the end */
312 GC_add_roots (start, start + size + 1);
318 mono_gc_deregister_root (char* addr)
321 /* FIXME: libgc doesn't define this work win32 for some reason */
322 /* FIXME: No size info */
323 GC_remove_roots (addr, addr + sizeof (gpointer) + 1);
328 mono_gc_weak_link_add (void **link_addr, MonoObject *obj, gboolean track)
330 /* libgc requires that we use HIDE_POINTER... */
331 *link_addr = (void*)HIDE_POINTER (obj);
332 GC_GENERAL_REGISTER_DISAPPEARING_LINK (link_addr, obj);
336 mono_gc_weak_link_remove (void **link_addr)
338 GC_unregister_disappearing_link (link_addr);
343 reveal_link (gpointer link_addr)
345 void **link_a = link_addr;
346 return REVEAL_POINTER (*link_a);
350 mono_gc_weak_link_get (void **link_addr)
352 MonoObject *obj = GC_call_with_alloc_lock (reveal_link, link_addr);
353 if (obj == (MonoObject *) -1)
359 mono_gc_make_descr_for_string (gsize *bitmap, int numbits)
361 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
365 mono_gc_make_descr_for_object (gsize *bitmap, int numbits, size_t obj_size)
367 return mono_gc_make_descr_from_bitmap (bitmap, numbits);
371 mono_gc_make_descr_for_array (int vector, gsize *elem_bitmap, int numbits, size_t elem_size)
373 /* libgc has no usable support for arrays... */
374 return GC_NO_DESCRIPTOR;
378 mono_gc_make_descr_from_bitmap (gsize *bitmap, int numbits)
380 #ifdef HAVE_GC_GCJ_MALLOC
381 /* It seems there are issues when the bitmap doesn't fit: play it safe */
383 return GC_NO_DESCRIPTOR;
385 return (gpointer)GC_make_descriptor ((GC_bitmap)bitmap, numbits);
392 mono_gc_alloc_fixed (size_t size, void *descr)
394 /* To help track down typed allocation bugs */
398 if (count == atoi (getenv ("COUNT2")))
400 if (count > atoi (getenv ("COUNT2")))
401 return GC_MALLOC (size);
405 return GC_MALLOC_EXPLICITLY_TYPED (size, (GC_descr)descr);
407 return GC_MALLOC (size);
411 mono_gc_free_fixed (void* addr)
416 mono_gc_invoke_finalizers (void)
418 /* There is a bug in GC_invoke_finalizer () in versions <= 6.2alpha4:
419 * the 'mem_freed' variable is not initialized when there are no
420 * objects to finalize, which leads to strange behavior later on.
421 * The check is necessary to work around that bug.
423 if (GC_should_invoke_finalizers ())
424 return GC_invoke_finalizers ();
429 mono_gc_pending_finalizers (void)
431 return GC_should_invoke_finalizers ();
435 * LOCKING: Assumes the domain_finalizers lock is held.
438 add_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
442 if (!domain->track_resurrection_objects_hash)
443 domain->track_resurrection_objects_hash = g_hash_table_new (mono_aligned_addr_hash, NULL);
445 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
446 refs = g_slist_prepend (refs, GUINT_TO_POINTER (gchandle));
447 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
451 mono_gc_add_weak_track_handle (MonoObject *obj, guint32 handle)
458 domain = mono_object_get_domain (obj);
460 mono_domain_finalizers_lock (domain);
462 add_weak_track_handle_internal (domain, obj, handle);
464 g_hash_table_insert (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (handle), obj);
466 mono_domain_finalizers_unlock (domain);
470 * LOCKING: Assumes the domain_finalizers lock is held.
473 remove_weak_track_handle_internal (MonoDomain *domain, MonoObject *obj, guint32 gchandle)
477 if (!domain->track_resurrection_objects_hash)
480 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
481 refs = g_slist_remove (refs, GUINT_TO_POINTER (gchandle));
482 g_hash_table_insert (domain->track_resurrection_objects_hash, obj, refs);
486 mono_gc_change_weak_track_handle (MonoObject *old_obj, MonoObject *obj, guint32 gchandle)
488 MonoDomain *domain = mono_domain_get ();
490 mono_domain_finalizers_lock (domain);
493 remove_weak_track_handle_internal (domain, old_obj, gchandle);
495 add_weak_track_handle_internal (domain, obj, gchandle);
497 mono_domain_finalizers_unlock (domain);
501 mono_gc_remove_weak_track_handle (guint32 gchandle)
503 MonoDomain *domain = mono_domain_get ();
506 /* Clean our entries in the two hashes in MonoDomain */
508 mono_domain_finalizers_lock (domain);
510 /* Get the original object this handle pointed to */
511 obj = g_hash_table_lookup (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
513 g_hash_table_remove (domain->track_resurrection_handles_hash, GUINT_TO_POINTER (gchandle));
515 remove_weak_track_handle_internal (domain, obj, gchandle);
518 mono_domain_finalizers_unlock (domain);
522 mono_gc_remove_weak_track_object (MonoDomain *domain, MonoObject *obj)
526 if (domain->track_resurrection_objects_hash) {
527 refs = g_hash_table_lookup (domain->track_resurrection_objects_hash, obj);
531 * Since we don't run finalizers again for resurrected objects,
532 * no need to keep these around.
534 g_hash_table_remove (domain->track_resurrection_objects_hash, obj);
541 mono_gc_wbarrier_set_field (MonoObject *obj, gpointer field_ptr, MonoObject* value)
543 *(void**)field_ptr = value;
547 mono_gc_wbarrier_set_arrayref (MonoArray *arr, gpointer slot_ptr, MonoObject* value)
549 *(void**)slot_ptr = value;
553 mono_gc_wbarrier_arrayref_copy (gpointer dest_ptr, gpointer src_ptr, int count)
555 memmove (dest_ptr, src_ptr, count * sizeof (gpointer));
559 mono_gc_wbarrier_generic_store (gpointer ptr, MonoObject* value)
561 *(void**)ptr = value;
565 mono_gc_wbarrier_generic_nostore (gpointer ptr)
570 mono_gc_wbarrier_value_copy (gpointer dest, gpointer src, int count, MonoClass *klass)
572 memmove (dest, src, count * mono_class_value_size (klass, NULL));
576 mono_gc_wbarrier_object_copy (MonoObject* obj, MonoObject *src)
578 /* do not copy the sync state */
579 memcpy ((char*)obj + sizeof (MonoObject), (char*)src + sizeof (MonoObject),
580 mono_object_class (obj)->instance_size - sizeof (MonoObject));
584 mono_gc_clear_domain (MonoDomain *domain)
589 mono_gc_get_suspend_signal (void)
591 #ifdef USE_INCLUDED_GC
592 return GC_get_suspend_signal ();
598 #if defined(USE_INCLUDED_LIBGC) && defined(USE_COMPILER_TLS) && defined(__linux__) && (defined(__i386__) || defined(__x86_64__))
599 extern __thread MONO_TLS_FAST void* GC_thread_tls;
600 #include "metadata-internals.h"
606 while (!(v & (1 << i)))
613 ATYPE_FREEPTR_FOR_BOX,
621 create_allocator (int atype, int offset)
623 int index_var, bytes_var, my_fl_var, my_entry_var;
624 guint32 no_freelist_branch, not_small_enough_branch = 0;
625 guint32 size_overflow_branch = 0;
626 MonoMethodBuilder *mb;
628 MonoMethodSignature *csig;
629 AllocatorWrapperInfo *info;
631 if (atype == ATYPE_STRING) {
632 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
633 csig->ret = &mono_defaults.string_class->byval_arg;
634 csig->params [0] = &mono_defaults.int_class->byval_arg;
635 csig->params [1] = &mono_defaults.int32_class->byval_arg;
637 csig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
638 csig->ret = &mono_defaults.object_class->byval_arg;
639 csig->params [0] = &mono_defaults.int_class->byval_arg;
642 mb = mono_mb_new (mono_defaults.object_class, "Alloc", MONO_WRAPPER_ALLOC);
643 bytes_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
644 if (atype == ATYPE_STRING) {
645 /* a string alloator method takes the args: (vtable, len) */
646 /* bytes = (sizeof (MonoString) + ((len + 1) * 2)); */
647 mono_mb_emit_ldarg (mb, 1);
648 mono_mb_emit_icon (mb, 1);
649 mono_mb_emit_byte (mb, MONO_CEE_ADD);
650 mono_mb_emit_icon (mb, 1);
651 mono_mb_emit_byte (mb, MONO_CEE_SHL);
652 // sizeof (MonoString) might include padding
653 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, chars));
654 mono_mb_emit_byte (mb, MONO_CEE_ADD);
655 mono_mb_emit_stloc (mb, bytes_var);
657 /* bytes = vtable->klass->instance_size */
658 mono_mb_emit_ldarg (mb, 0);
659 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoVTable, klass));
660 mono_mb_emit_byte (mb, MONO_CEE_ADD);
661 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
662 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoClass, instance_size));
663 mono_mb_emit_byte (mb, MONO_CEE_ADD);
664 /* FIXME: assert instance_size stays a 4 byte integer */
665 mono_mb_emit_byte (mb, MONO_CEE_LDIND_U4);
666 mono_mb_emit_stloc (mb, bytes_var);
669 /* this is needed for strings/arrays only as the other big types are never allocated with this method */
670 if (atype == ATYPE_STRING) {
672 /* if (!SMALL_ENOUGH (bytes)) jump slow_path;*/
673 mono_mb_emit_ldloc (mb, bytes_var);
674 mono_mb_emit_icon (mb, (NFREELISTS-1) * GRANULARITY);
675 not_small_enough_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BGT_UN_S);
676 /* check for overflow */
677 mono_mb_emit_ldloc (mb, bytes_var);
678 mono_mb_emit_icon (mb, sizeof (MonoString));
679 size_overflow_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLE_UN_S);
682 /* int index = INDEX_FROM_BYTES(bytes); */
683 index_var = mono_mb_add_local (mb, &mono_defaults.int32_class->byval_arg);
685 mono_mb_emit_ldloc (mb, bytes_var);
686 mono_mb_emit_icon (mb, GRANULARITY - 1);
687 mono_mb_emit_byte (mb, MONO_CEE_ADD);
688 mono_mb_emit_icon (mb, shift_amount (GRANULARITY));
689 mono_mb_emit_byte (mb, MONO_CEE_SHR_UN);
690 mono_mb_emit_icon (mb, shift_amount (sizeof (gpointer)));
691 mono_mb_emit_byte (mb, MONO_CEE_SHL);
692 /* index var is already adjusted into bytes */
693 mono_mb_emit_stloc (mb, index_var);
695 my_fl_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
696 my_entry_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
697 /* my_fl = ((GC_thread)tsd) -> ptrfree_freelists + index; */
698 mono_mb_emit_byte (mb, MONO_CUSTOM_PREFIX);
699 mono_mb_emit_byte (mb, 0x0D); /* CEE_MONO_TLS */
700 mono_mb_emit_i4 (mb, offset);
701 if (atype == ATYPE_FREEPTR || atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING)
702 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, ptrfree_freelists));
703 else if (atype == ATYPE_NORMAL)
704 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, normal_freelists));
705 else if (atype == ATYPE_GCJ)
706 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (struct GC_Thread_Rep, gcj_freelists));
708 g_assert_not_reached ();
709 mono_mb_emit_byte (mb, MONO_CEE_ADD);
710 mono_mb_emit_ldloc (mb, index_var);
711 mono_mb_emit_byte (mb, MONO_CEE_ADD);
712 mono_mb_emit_stloc (mb, my_fl_var);
714 /* my_entry = *my_fl; */
715 mono_mb_emit_ldloc (mb, my_fl_var);
716 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
717 mono_mb_emit_stloc (mb, my_entry_var);
719 /* if (EXPECT((word)my_entry >= HBLKSIZE, 1)) { */
720 mono_mb_emit_ldloc (mb, my_entry_var);
721 mono_mb_emit_icon (mb, HBLKSIZE);
722 no_freelist_branch = mono_mb_emit_short_branch (mb, MONO_CEE_BLT_UN_S);
724 /* ptr_t next = obj_link(my_entry); *my_fl = next; */
725 mono_mb_emit_ldloc (mb, my_fl_var);
726 mono_mb_emit_ldloc (mb, my_entry_var);
727 mono_mb_emit_byte (mb, MONO_CEE_LDIND_I);
728 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
730 /* set the vtable and clear the words in the object */
731 mono_mb_emit_ldloc (mb, my_entry_var);
732 mono_mb_emit_ldarg (mb, 0);
733 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
735 if (atype == ATYPE_FREEPTR) {
736 int start_var, end_var, start_loop;
737 /* end = my_entry + bytes; start = my_entry + sizeof (gpointer);
739 start_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
740 end_var = mono_mb_add_local (mb, &mono_defaults.int_class->byval_arg);
741 mono_mb_emit_ldloc (mb, my_entry_var);
742 mono_mb_emit_ldloc (mb, bytes_var);
743 mono_mb_emit_byte (mb, MONO_CEE_ADD);
744 mono_mb_emit_stloc (mb, end_var);
745 mono_mb_emit_ldloc (mb, my_entry_var);
746 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
747 mono_mb_emit_byte (mb, MONO_CEE_ADD);
748 mono_mb_emit_stloc (mb, start_var);
752 * } while (start < end);
754 start_loop = mono_mb_get_label (mb);
755 mono_mb_emit_ldloc (mb, start_var);
756 mono_mb_emit_icon (mb, 0);
757 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
758 mono_mb_emit_ldloc (mb, start_var);
759 mono_mb_emit_icon (mb, sizeof (gpointer));
760 mono_mb_emit_byte (mb, MONO_CEE_ADD);
761 mono_mb_emit_stloc (mb, start_var);
763 mono_mb_emit_ldloc (mb, start_var);
764 mono_mb_emit_ldloc (mb, end_var);
765 mono_mb_emit_byte (mb, MONO_CEE_BLT_UN_S);
766 mono_mb_emit_byte (mb, start_loop - (mono_mb_get_label (mb) + 1));
767 } else if (atype == ATYPE_FREEPTR_FOR_BOX || atype == ATYPE_STRING) {
768 /* need to clear just the sync pointer */
769 mono_mb_emit_ldloc (mb, my_entry_var);
770 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoObject, synchronisation));
771 mono_mb_emit_byte (mb, MONO_CEE_ADD);
772 mono_mb_emit_icon (mb, 0);
773 mono_mb_emit_byte (mb, MONO_CEE_STIND_I);
776 if (atype == ATYPE_STRING) {
777 /* need to set length and clear the last char */
778 /* s->length = len; */
779 mono_mb_emit_ldloc (mb, my_entry_var);
780 mono_mb_emit_icon (mb, G_STRUCT_OFFSET (MonoString, length));
781 mono_mb_emit_byte (mb, MONO_CEE_ADD);
782 mono_mb_emit_ldarg (mb, 1);
783 mono_mb_emit_byte (mb, MONO_CEE_STIND_I4);
784 /* s->chars [len] = 0; */
785 mono_mb_emit_ldloc (mb, my_entry_var);
786 mono_mb_emit_ldloc (mb, bytes_var);
787 mono_mb_emit_icon (mb, 2);
788 mono_mb_emit_byte (mb, MONO_CEE_SUB);
789 mono_mb_emit_byte (mb, MONO_CEE_ADD);
790 mono_mb_emit_icon (mb, 0);
791 mono_mb_emit_byte (mb, MONO_CEE_STIND_I2);
794 /* return my_entry; */
795 mono_mb_emit_ldloc (mb, my_entry_var);
796 mono_mb_emit_byte (mb, MONO_CEE_RET);
798 mono_mb_patch_short_branch (mb, no_freelist_branch);
799 if (not_small_enough_branch > 0)
800 mono_mb_patch_short_branch (mb, not_small_enough_branch);
801 if (size_overflow_branch > 0)
802 mono_mb_patch_short_branch (mb, size_overflow_branch);
803 /* the slow path: we just call back into the runtime */
804 if (atype == ATYPE_STRING) {
805 mono_mb_emit_ldarg (mb, 1);
806 mono_mb_emit_icall (mb, mono_string_alloc);
808 mono_mb_emit_ldarg (mb, 0);
809 mono_mb_emit_icall (mb, mono_object_new_specific);
812 mono_mb_emit_byte (mb, MONO_CEE_RET);
814 res = mono_mb_create_method (mb, csig, 8);
816 mono_method_get_header (res)->init_locals = FALSE;
818 info = mono_image_alloc0 (mono_defaults.corlib, sizeof (AllocatorWrapperInfo));
819 info->alloc_type = atype;
820 mono_marshal_set_wrapper_info (res, info);
825 static MonoMethod* alloc_method_cache [ATYPE_NUM];
828 * If possible, generate a managed method that can quickly allocate objects in class
829 * @klass. The method will typically have an thread-local inline allocation sequence.
830 * The signature of the called method is:
831 * object allocate (MonoVTable *vtable)
832 * Some of the logic here is similar to mono_class_get_allocation_ftn () i object.c,
834 * The thread local alloc logic is taken from libgc/pthread_support.c.
838 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
842 MonoClass *klass = vtable->klass;
843 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
845 /*g_print ("thread tls: %d\n", offset);*/
848 if (!SMALL_ENOUGH (klass->instance_size))
850 if (klass->has_finalize || klass->marshalbyref || (mono_profiler_get_events () & MONO_PROFILE_ALLOCATIONS))
854 if (klass->byval_arg.type == MONO_TYPE_STRING) {
855 atype = ATYPE_STRING;
856 } else if (!klass->has_references) {
858 atype = ATYPE_FREEPTR_FOR_BOX;
860 atype = ATYPE_FREEPTR;
864 * disabled because we currently do a runtime choice anyway, to
865 * deal with multiple appdomains.
866 if (vtable->gc_descr != GC_NO_DESCRIPTOR)
869 atype = ATYPE_NORMAL;
872 return mono_gc_get_managed_allocator_by_type (atype);
876 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
882 * mono_gc_get_managed_allocator_by_type:
884 * Return a managed allocator method corresponding to allocator type ATYPE.
887 mono_gc_get_managed_allocator_by_type (int atype)
891 MONO_THREAD_VAR_OFFSET (GC_thread_tls, offset);
894 res = alloc_method_cache [atype];
896 res = alloc_method_cache [atype] = create_allocator (atype, offset);
897 mono_loader_unlock ();
902 mono_gc_get_managed_allocator_types (void)
908 mono_gc_get_write_barrier (void)
910 g_assert_not_reached ();
917 mono_gc_get_managed_allocator (MonoVTable *vtable, gboolean for_box)
923 mono_gc_get_managed_array_allocator (MonoVTable *vtable, int rank)
929 mono_gc_get_managed_allocator_by_type (int atype)
935 mono_gc_get_managed_allocator_types (void)
941 mono_gc_get_write_barrier (void)
943 g_assert_not_reached ();
950 mono_gc_invoke_with_gc_lock (MonoGCLockedCallbackFunc func, void *data)
952 return GC_call_with_alloc_lock (func, data);
955 #endif /* no Boehm GC */