mono/metadata/sgen-major-scan-object.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 extern long long stat_scan_object_called_major;
  23
  24 #ifdef FIXED_HEAP
  25 #define PREFETCH_DYNAMIC_HEAP(addr)
  26 #else
  27 #define PREFETCH_DYNAMIC_HEAP(addr)     PREFETCH ((addr))
  28 #endif
  29
  30 #ifdef SCAN_FOR_CONCURRENT_MARK
  31 #define FOLLOW_OBJECT(addr)     (!sgen_ptr_in_nursery ((addr)))
  32 #define ALWAYS_ADD_TO_GLOBAL_REMSET     1
  33 #define CONCURRENT_NAME(x)      x ## _concurrent
  34 #else
  35 #define FOLLOW_OBJECT(addr)     1
  36 #define ALWAYS_ADD_TO_GLOBAL_REMSET     0
  37 #define CONCURRENT_NAME(x)      x
  38 #endif
  39
  40 #undef HANDLE_PTR
  41 #define HANDLE_PTR(ptr,obj)     do {                                    \
  42                 void *__old = *(ptr);                                   \
  43                 void *__copy;                                           \
  44                 if (__old && FOLLOW_OBJECT (__old)) {                   \
  45                         PREFETCH_DYNAMIC_HEAP (__old);                  \
  46                         CONCURRENT_NAME (major_copy_or_mark_object) ((ptr), __old, queue); \
  47                         __copy = *(ptr);                                \
  48                         SGEN_COND_LOG (9, __old != __copy, "Overwrote field at %p with %p (was: %p)", (ptr), *(ptr), __old); \
  49                         if (G_UNLIKELY (sgen_ptr_in_nursery (__copy) && !sgen_ptr_in_nursery ((ptr)))) \
  50                                 sgen_add_to_global_remset ((ptr), __copy);      \
  51                 } else {                                                \
  52                         if (ALWAYS_ADD_TO_GLOBAL_REMSET && G_UNLIKELY (sgen_ptr_in_nursery (__old) && !sgen_ptr_in_nursery ((ptr)))) \
  53                                 sgen_add_to_global_remset ((ptr), __old); \
  54                 }                                                       \
  55         } while (0)
  56
  57 static void
  58 CONCURRENT_NAME (major_scan_object) (char *start, SgenGrayQueue *queue)
  59 {
  60 #include "sgen-scan-object.h"
  61
  62         HEAVY_STAT (++stat_scan_object_called_major);
  63 }
  64
  65 #ifdef SCAN_FOR_CONCURRENT_MARK
  66 #ifdef SGEN_PARALLEL_MARK
  67 #error concurrent and parallel mark not supported yet
  68 #else
  69 static void
  70 CONCURRENT_NAME (major_scan_vtype) (char *start, mword desc, SgenGrayQueue *queue)
  71 {
  72         /* The descriptors include info about the MonoObject header as well */
  73         start -= sizeof (MonoObject);
  74
  75 #define SCAN_OBJECT_NOVTABLE
  76 #include "sgen-scan-object.h"
  77 }
  78 #endif
  79 #endif
  80
  81 #undef PREFETCH_DYNAMIC_HEAP
  82 #undef FOLLOW_OBJECT
  83 #undef ALWAYS_ADD_TO_GLOBAL_REMSET
  84 #undef CONCURRENT_NAME