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.
22 #include "mono/utils/mono-compiler.h"
24 extern long long stat_copy_object_called_nursery;
25 extern long long stat_objects_copied_nursery;
27 extern long long stat_nursery_copy_object_failed_from_space;
28 extern long long stat_nursery_copy_object_failed_forwarded;
29 extern long long stat_nursery_copy_object_failed_pinned;
31 extern long long stat_slots_allocated_in_vain;
34 * This function can be used even if the vtable of obj is not valid
35 * anymore, which is the case in the parallel collector.
37 static MONO_ALWAYS_INLINE void
38 par_copy_object_no_checks (char *destination, MonoVTable *vt, void *obj, mword objsize, SgenGrayQueue *queue)
41 static const void *copy_labels [] = { &&LAB_0, &&LAB_1, &&LAB_2, &&LAB_3, &&LAB_4, &&LAB_5, &&LAB_6, &&LAB_7, &&LAB_8 };
44 SGEN_ASSERT (9, vt->klass->inited, "vtable %p for class %s:%s was not initialized", vt, vt->klass->name_space, vt->klass->name);
45 SGEN_LOG (9, " (to %p, %s size: %lu)", destination, ((MonoObject*)obj)->vtable->klass->name, (unsigned long)objsize);
46 binary_protocol_copy (obj, destination, vt, objsize);
49 if (G_UNLIKELY (MONO_GC_OBJ_MOVED_ENABLED ())) {
50 int dest_gen = sgen_ptr_in_nursery (destination) ? GENERATION_NURSERY : GENERATION_OLD;
51 int src_gen = sgen_ptr_in_nursery (obj) ? GENERATION_NURSERY : GENERATION_OLD;
52 MONO_GC_OBJ_MOVED ((mword)destination, (mword)obj, dest_gen, src_gen, objsize, vt->klass->name_space, vt->klass->name);
57 if (objsize <= sizeof (gpointer) * 8) {
58 mword *dest = (mword*)destination;
59 goto *copy_labels [objsize / sizeof (gpointer)];
61 (dest) [7] = ((mword*)obj) [7];
63 (dest) [6] = ((mword*)obj) [6];
65 (dest) [5] = ((mword*)obj) [5];
67 (dest) [4] = ((mword*)obj) [4];
69 (dest) [3] = ((mword*)obj) [3];
71 (dest) [2] = ((mword*)obj) [2];
73 (dest) [1] = ((mword*)obj) [1];
79 /*can't trust memcpy doing word copies */
80 mono_gc_memmove_aligned (destination + sizeof (mword), (char*)obj + sizeof (mword), objsize - sizeof (mword));
83 mono_gc_memmove_aligned (destination + sizeof (mword), (char*)obj + sizeof (mword), objsize - sizeof (mword));
85 /* adjust array->bounds */
86 SGEN_ASSERT (9, vt->gc_descr, "vtable %p for class %s:%s has no gc descriptor", vt, vt->klass->name_space, vt->klass->name);
88 if (G_UNLIKELY (vt->rank && ((MonoArray*)obj)->bounds)) {
89 MonoArray *array = (MonoArray*)destination;
90 array->bounds = (MonoArrayBounds*)((char*)destination + ((char*)((MonoArray*)obj)->bounds - (char*)obj));
91 SGEN_LOG (9, "Array instance %p: size: %lu, rank: %d, length: %lu", array, (unsigned long)objsize, vt->rank, (unsigned long)mono_array_length (array));
93 if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_GC_MOVES))
94 sgen_register_moved_object (obj, destination);
97 SGEN_LOG (9, "Enqueuing gray object %p (%s)", obj, sgen_safe_name (obj));
98 GRAY_OBJECT_ENQUEUE (queue, obj);
103 * This can return OBJ itself on OOM.
105 static MONO_NEVER_INLINE void*
106 copy_object_no_checks (void *obj, SgenGrayQueue *queue)
108 MonoVTable *vt = ((MonoObject*)obj)->vtable;
109 gboolean has_references = SGEN_VTABLE_HAS_REFERENCES (vt);
110 mword objsize = SGEN_ALIGN_UP (sgen_par_object_get_size (vt, (MonoObject*)obj));
111 char *destination = COLLECTOR_SERIAL_ALLOC_FOR_PROMOTION (vt, obj, objsize, has_references);
113 if (G_UNLIKELY (!destination)) {
114 collector_pin_object (obj, queue);
115 sgen_set_pinned_from_failed_allocation (objsize);
119 par_copy_object_no_checks (destination, vt, obj, objsize, has_references ? queue : NULL);
120 /* FIXME: mark mod union cards if necessary */
122 /* set the forwarding pointer */
123 SGEN_FORWARD_OBJECT (obj, destination);