mono/sgen/sgen-marksweep-scan-object-concurrent.h

   1 /*
   2  * sgen-major-scan-object.h: Object scanning in the major collectors.
   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 /*
  23  * FIXME: We use the same scanning function in the concurrent collector whether we scan
  24  * during the starting/finishing collection pause (with the world stopped) or from the
  25  * concurrent worker thread.
  26  *
  27  * As long as the world is stopped, we should just follow pointers into the nursery and
  28  * evict if possible.  In that case we also don't need the ALWAYS_ADD_TO_GLOBAL_REMSET case,
  29  * which only seems to make sense for when the world is stopped, in which case we only need
  30  * it because we don't follow into the nursery.
  31  */
  32
  33 #undef HANDLE_PTR
  34 #define HANDLE_PTR(ptr,obj)     do {                                    \
  35                 GCObject *__old = *(ptr);                                   \
  36                 binary_protocol_scan_process_reference ((full_object), (ptr), __old); \
  37                 if (__old) {                                            \
  38                         gboolean __still_in_nursery = major_copy_or_mark_object_with_evacuation ((ptr), __old, queue); \
  39                         if (G_UNLIKELY (__still_in_nursery && !sgen_ptr_in_nursery ((ptr)) && !SGEN_OBJECT_IS_CEMENTED (*(ptr)))) { \
  40                                 GCObject *__copy = *(ptr);                  \
  41                                 sgen_add_to_global_remset ((ptr), __copy); \
  42                         }                                               \
  43                 }                                                       \
  44         } while (0)
  45
  46
  47 static void
  48 major_scan_vtype_concurrent_finish (GCObject *full_object, char *start, SgenDescriptor desc, SgenGrayQueue *queue BINARY_PROTOCOL_ARG (size_t size))
  49 {
  50         SGEN_OBJECT_LAYOUT_STATISTICS_DECLARE_BITMAP;
  51
  52 #ifdef HEAVY_STATISTICS
  53         /* FIXME: We're half scanning this object.  How do we account for that? */
  54         //add_scanned_object (start);
  55 #endif
  56
  57         /* The descriptors include info about the object header as well */
  58         start -= SGEN_CLIENT_OBJECT_HEADER_SIZE;
  59
  60 #define SCAN_OBJECT_NOVTABLE
  61 #define SCAN_OBJECT_PROTOCOL
  62 #include "sgen-scan-object.h"
  63
  64         SGEN_OBJECT_LAYOUT_STATISTICS_COMMIT_BITMAP;
  65 }