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sgen-major-copy-object.h
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sgen-major-copy-object.h
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/*
* Copyright 2001-2003 Ximian, Inc
* Copyright 2003-2010 Novell, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
extern long long stat_copy_object_called_nursery;
extern long long stat_objects_copied_nursery;
extern long long stat_nursery_copy_object_failed_from_space;
extern long long stat_nursery_copy_object_failed_forwarded;
extern long long stat_nursery_copy_object_failed_pinned;
/*
* This function can be used even if the vtable of obj is not valid
* anymore, which is the case in the parallel collector.
*/
static void
par_copy_object_no_checks (char *destination, MonoVTable *vt, void *obj, mword objsize, SgenGrayQueue *queue)
{
static const void *copy_labels [] = { &&LAB_0, &&LAB_1, &&LAB_2, &&LAB_3, &&LAB_4, &&LAB_5, &&LAB_6, &&LAB_7, &&LAB_8 };
DEBUG (9, g_assert (vt->klass->inited));
DEBUG (9, fprintf (gc_debug_file, " (to %p, %s size: %lu)\n", destination, ((MonoObject*)obj)->vtable->klass->name, (unsigned long)objsize));
binary_protocol_copy (obj, destination, vt, objsize);
*(MonoVTable**)destination = vt;
if (objsize <= sizeof (gpointer) * 8) {
mword *dest = (mword*)destination;
goto *copy_labels [objsize / sizeof (gpointer)];
LAB_8:
(dest) [7] = ((mword*)obj) [7];
LAB_7:
(dest) [6] = ((mword*)obj) [6];
LAB_6:
(dest) [5] = ((mword*)obj) [5];
LAB_5:
(dest) [4] = ((mword*)obj) [4];
LAB_4:
(dest) [3] = ((mword*)obj) [3];
LAB_3:
(dest) [2] = ((mword*)obj) [2];
LAB_2:
(dest) [1] = ((mword*)obj) [1];
LAB_1:
;
LAB_0:
;
} else {
memcpy (destination + sizeof (mword), (char*)obj + sizeof (mword), objsize - sizeof (mword));
}
/* adjust array->bounds */
DEBUG (9, g_assert (vt->gc_descr));
if (G_UNLIKELY (vt->rank && ((MonoArray*)obj)->bounds)) {
MonoArray *array = (MonoArray*)destination;
array->bounds = (MonoArrayBounds*)((char*)destination + ((char*)((MonoArray*)obj)->bounds - (char*)obj));
DEBUG (9, fprintf (gc_debug_file, "Array instance %p: size: %lu, rank: %d, length: %lu\n", array, (unsigned long)objsize, vt->rank, (unsigned long)mono_array_length (array)));
}
if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_GC_MOVES))
mono_sgen_register_moved_object (obj, destination);
obj = destination;
if (queue) {
DEBUG (9, fprintf (gc_debug_file, "Enqueuing gray object %p (%s)\n", obj, safe_name (obj)));
GRAY_OBJECT_ENQUEUE (queue, obj);
}
}
static void*
copy_object_no_checks (void *obj, SgenGrayQueue *queue)
{
MonoVTable *vt = ((MonoObject*)obj)->vtable;
gboolean has_references = SGEN_VTABLE_HAS_REFERENCES (vt);
mword objsize = SGEN_ALIGN_UP (mono_sgen_par_object_get_size (vt, (MonoObject*)obj));
char *destination = major_alloc_object (objsize, has_references);
par_copy_object_no_checks (destination, vt, obj, objsize, has_references ? queue : NULL);
/* set the forwarding pointer */
SGEN_FORWARD_OBJECT (obj, destination);
return destination;
}
/*
* This is how the copying happens from the nursery to the old generation.
* We assume that at this time all the pinned objects have been identified and
* marked as such.
* We run scan_object() for each pinned object so that each referenced
* objects if possible are copied. The new gray objects created can have
* scan_object() run on them right away, too.
* Then we run copy_object() for the precisely tracked roots. At this point
* all the roots are either gray or black. We run scan_object() on the gray
* objects until no more gray objects are created.
* At the end of the process we walk again the pinned list and we unmark
* the pinned flag. As we go we also create the list of free space for use
* in the next allocation runs.
*
* We need to remember objects from the old generation that point to the new one
* (or just addresses?).
*
* copy_object could be made into a macro once debugged (use inline for now).
*/
static void
copy_object (void **obj_slot, SgenGrayQueue *queue)
{
char *forwarded;
char *obj = *obj_slot;
DEBUG (9, g_assert (current_collection_generation == GENERATION_NURSERY));
HEAVY_STAT (++stat_copy_object_called_nursery);
if (!ptr_in_nursery (obj)) {
HEAVY_STAT (++stat_nursery_copy_object_failed_from_space);
return;
}
DEBUG (9, fprintf (gc_debug_file, "Precise copy of %p from %p", obj, obj_slot));
/*
* Before we can copy the object we must make sure that we are
* allowed to, i.e. that the object not pinned or not already
* forwarded.
*/
if ((forwarded = SGEN_OBJECT_IS_FORWARDED (obj))) {
DEBUG (9, g_assert (((MonoVTable*)LOAD_VTABLE(obj))->gc_descr));
DEBUG (9, fprintf (gc_debug_file, " (already forwarded to %p)\n", forwarded));
HEAVY_STAT (++stat_nursery_copy_object_failed_forwarded);
*obj_slot = forwarded;
return;
}
if (SGEN_OBJECT_IS_PINNED (obj)) {
DEBUG (9, g_assert (((MonoVTable*)LOAD_VTABLE(obj))->gc_descr));
DEBUG (9, fprintf (gc_debug_file, " (pinned, no change)\n"));
HEAVY_STAT (++stat_nursery_copy_object_failed_pinned);
return;
}
HEAVY_STAT (++stat_objects_copied_nursery);
*obj_slot = copy_object_no_checks (obj, queue);
}
#define FILL_COLLECTOR_COPY_OBJECT(collector) do { \
(collector)->copy_object = copy_object; \
} while (0)