2 * sgen-copy-object.h: This is where objects are copied.
4 * Copyright 2001-2003 Ximian, Inc
5 * Copyright 2003-2010 Novell, Inc.
6 * Copyright (C) 2012 Xamarin Inc
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License 2.0 as published by the Free Software Foundation;
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License 2.0 along with this library; if not, write to the Free
19 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 extern long long stat_copy_object_called_nursery;
22 extern long long stat_objects_copied_nursery;
24 extern long long stat_nursery_copy_object_failed_from_space;
25 extern long long stat_nursery_copy_object_failed_forwarded;
26 extern long long stat_nursery_copy_object_failed_pinned;
28 extern long long stat_slots_allocated_in_vain;
31 * This function can be used even if the vtable of obj is not valid
32 * anymore, which is the case in the parallel collector.
35 par_copy_object_no_checks (char *destination, MonoVTable *vt, void *obj, mword objsize, SgenGrayQueue *queue)
38 static const void *copy_labels [] = { &&LAB_0, &&LAB_1, &&LAB_2, &&LAB_3, &&LAB_4, &&LAB_5, &&LAB_6, &&LAB_7, &&LAB_8 };
41 SGEN_ASSERT (9, vt->klass->inited, "vtable %p for class %s:%s was not initialized", vt, vt->klass->name_space, vt->klass->name);
42 SGEN_LOG (9, " (to %p, %s size: %lu)", destination, ((MonoObject*)obj)->vtable->klass->name, (unsigned long)objsize);
43 binary_protocol_copy (obj, destination, vt, objsize);
46 if (G_UNLIKELY (MONO_GC_OBJ_MOVED_ENABLED ())) {
47 int dest_gen = sgen_ptr_in_nursery (destination) ? GENERATION_NURSERY : GENERATION_OLD;
48 int src_gen = sgen_ptr_in_nursery (obj) ? GENERATION_NURSERY : GENERATION_OLD;
49 MONO_GC_OBJ_MOVED ((mword)destination, (mword)obj, dest_gen, src_gen, objsize, vt->klass->name_space, vt->klass->name);
54 if (objsize <= sizeof (gpointer) * 8) {
55 mword *dest = (mword*)destination;
56 goto *copy_labels [objsize / sizeof (gpointer)];
58 (dest) [7] = ((mword*)obj) [7];
60 (dest) [6] = ((mword*)obj) [6];
62 (dest) [5] = ((mword*)obj) [5];
64 (dest) [4] = ((mword*)obj) [4];
66 (dest) [3] = ((mword*)obj) [3];
68 (dest) [2] = ((mword*)obj) [2];
70 (dest) [1] = ((mword*)obj) [1];
76 /*can't trust memcpy doing word copies */
77 mono_gc_memmove (destination + sizeof (mword), (char*)obj + sizeof (mword), objsize - sizeof (mword));
80 mono_gc_memmove (destination + sizeof (mword), (char*)obj + sizeof (mword), objsize - sizeof (mword));
82 /* adjust array->bounds */
83 SGEN_ASSERT (9, vt->gc_descr, "vtable %p for class %s:%s has no gc descriptor", vt, vt->klass->name_space, vt->klass->name);
85 if (G_UNLIKELY (vt->rank && ((MonoArray*)obj)->bounds)) {
86 MonoArray *array = (MonoArray*)destination;
87 array->bounds = (MonoArrayBounds*)((char*)destination + ((char*)((MonoArray*)obj)->bounds - (char*)obj));
88 SGEN_LOG (9, "Array instance %p: size: %lu, rank: %d, length: %lu", array, (unsigned long)objsize, vt->rank, (unsigned long)mono_array_length (array));
90 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_GC_MOVES))
91 sgen_register_moved_object (obj, destination);
94 SGEN_LOG (9, "Enqueuing gray object %p (%s)", obj, sgen_safe_name (obj));
95 GRAY_OBJECT_ENQUEUE (queue, obj);
100 * This can return OBJ itself on OOM.
103 static __declspec(noinline) void*
105 static G_GNUC_UNUSED void* __attribute__((noinline))
107 copy_object_no_checks (void *obj, SgenGrayQueue *queue)
109 MonoVTable *vt = ((MonoObject*)obj)->vtable;
110 gboolean has_references = SGEN_VTABLE_HAS_REFERENCES (vt);
111 mword objsize = SGEN_ALIGN_UP (sgen_par_object_get_size (vt, (MonoObject*)obj));
112 char *destination = COLLECTOR_SERIAL_ALLOC_FOR_PROMOTION (vt, obj, objsize, has_references);
114 if (G_UNLIKELY (!destination)) {
115 collector_pin_object (obj, queue);
116 sgen_set_pinned_from_failed_allocation (objsize);
120 par_copy_object_no_checks (destination, vt, obj, objsize, has_references ? queue : NULL);
121 /* FIXME: mark mod union cards if necessary */
123 /* set the forwarding pointer */
124 SGEN_FORWARD_OBJECT (obj, destination);