mono/metadata/sgen-copy-object.h

   1 /*
   2  * sgen-copy-object.h: This is where objects are copied.
   3  *
   4  * Copyright 2001-2003 Ximian, Inc
   5  * Copyright 2003-2010 Novell, Inc.
   6  * Copyright (C) 2012 Xamarin Inc
   7  *
   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;
  11  *
  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.
  16  *
  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.
  20  */
  21
  22 #include "mono/utils/mono-compiler.h"
  23
  24 extern guint64 stat_copy_object_called_nursery;
  25 extern guint64 stat_objects_copied_nursery;
  26
  27 extern guint64 stat_nursery_copy_object_failed_from_space;
  28 extern guint64 stat_nursery_copy_object_failed_forwarded;
  29 extern guint64 stat_nursery_copy_object_failed_pinned;
  30
  31 extern guint64 stat_slots_allocated_in_vain;
  32
  33 /*
  34  * Copies an object and enqueues it if a queue is given.
  35  *
  36  * This function can be used even if the vtable of obj is not valid
  37  * anymore, which is the case in the parallel collector.
  38  */
  39 static MONO_ALWAYS_INLINE void
  40 par_copy_object_no_checks (char *destination, MonoVTable *vt, void *obj, mword objsize, SgenGrayQueue *queue)
  41 {
  42         SGEN_ASSERT (9, vt->klass->inited, "vtable %p for class %s:%s was not initialized", vt, vt->klass->name_space, vt->klass->name);
  43         SGEN_LOG (9, " (to %p, %s size: %lu)", destination, ((MonoObject*)obj)->vtable->klass->name, (unsigned long)objsize);
  44         binary_protocol_copy (obj, destination, vt, objsize);
  45
  46 #ifdef ENABLE_DTRACE
  47         if (G_UNLIKELY (MONO_GC_OBJ_MOVED_ENABLED ())) {
  48                 int dest_gen = sgen_ptr_in_nursery (destination) ? GENERATION_NURSERY : GENERATION_OLD;
  49                 int src_gen = sgen_ptr_in_nursery (obj) ? GENERATION_NURSERY : GENERATION_OLD;
  50                 MONO_GC_OBJ_MOVED ((mword)destination, (mword)obj, dest_gen, src_gen, objsize, vt->klass->name_space, vt->klass->name);
  51         }
  52 #endif
  53
  54         memcpy (destination + sizeof (mword), (char*)obj + sizeof (mword), objsize - sizeof (mword));
  55
  56         /* adjust array->bounds */
  57         SGEN_ASSERT (9, vt->gc_descr, "vtable %p for class %s:%s has no gc descriptor", vt, vt->klass->name_space, vt->klass->name);
  58
  59         if (G_UNLIKELY (vt->rank && ((MonoArray*)obj)->bounds)) {
  60                 MonoArray *array = (MonoArray*)destination;
  61                 array->bounds = (MonoArrayBounds*)((char*)destination + ((char*)((MonoArray*)obj)->bounds - (char*)obj));
  62                 SGEN_LOG (9, "Array instance %p: size: %lu, rank: %d, length: %lu", array, (unsigned long)objsize, vt->rank, (unsigned long)mono_array_length (array));
  63         }
  64         if (G_UNLIKELY (mono_profiler_events & MONO_PROFILE_GC_MOVES))
  65                 sgen_register_moved_object (obj, destination);
  66         obj = destination;
  67         if (queue) {
  68                 SGEN_LOG (9, "Enqueuing gray object %p (%s)", obj, sgen_safe_name (obj));
  69                 GRAY_OBJECT_ENQUEUE (queue, obj, sgen_vtable_get_descriptor (vt));
  70         }
  71 }
  72
  73 /*
  74  * This can return OBJ itself on OOM.
  75  */
  76 static MONO_NEVER_INLINE void*
  77 copy_object_no_checks (void *obj, SgenGrayQueue *queue)
  78 {
  79         MonoVTable *vt = ((MonoObject*)obj)->vtable;
  80         gboolean has_references = SGEN_VTABLE_HAS_REFERENCES (vt);
  81         mword objsize = SGEN_ALIGN_UP (sgen_par_object_get_size (vt, (MonoObject*)obj));
  82         /* FIXME: Does this not mark the newly allocated object? */
  83         char *destination = COLLECTOR_SERIAL_ALLOC_FOR_PROMOTION (vt, obj, objsize, has_references);
  84
  85         if (G_UNLIKELY (!destination)) {
  86                 /* FIXME: Is this path ever tested? */
  87                 collector_pin_object (obj, queue);
  88                 sgen_set_pinned_from_failed_allocation (objsize);
  89                 return obj;
  90         }
  91
  92         if (!has_references)
  93                 queue = NULL;
  94
  95         par_copy_object_no_checks (destination, vt, obj, objsize, queue);
  96         /* FIXME: mark mod union cards if necessary */
  97
  98         /* set the forwarding pointer */
  99         SGEN_FORWARD_OBJECT (obj, destination);
 100
 101         return destination;
 102 }