mono/metadata/sgen-cardtable.h

   1 /*
   2  * Copyright 2001-2003 Ximian, Inc
   3  * Copyright 2003-2010 Novell, Inc.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining
   6  * a copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sublicense, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be
  14  * included in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  17  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  19  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  20  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  21  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  22  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24 #ifndef __MONO_SGEN_CARD_TABLE_INLINES_H__
  25 #define __MONO_SGEN_CARD_TABLE_INLINES_H__
  26
  27 #define SGEN_HAVE_CARDTABLE     1
  28
  29 #ifdef SGEN_HAVE_CARDTABLE
  30
  31 void sgen_card_table_reset_region (mword start, mword end) MONO_INTERNAL;
  32 void* sgen_card_table_align_pointer (void *ptr) MONO_INTERNAL;
  33 void sgen_card_table_mark_range (mword address, mword size) MONO_INTERNAL;
  34 void sgen_cardtable_scan_object (char *obj, mword obj_size, guint8 *cards, SgenGrayQueue *queue) MONO_INTERNAL;
  35
  36 gboolean sgen_card_table_get_card_data (guint8 *dest, mword address, mword cards) MONO_INTERNAL;
  37 void sgen_scan_from_card_tables (void *start_nursery, void *end_nursery, SgenGrayQueue *queue) MONO_INTERNAL;
  38 void sgen_card_tables_collect_stats (gboolean begin) MONO_INTERNAL;
  39 void sgen_card_table_clear (void) MONO_INTERNAL;
  40 void sgen_card_table_init (void) MONO_INTERNAL;
  41 gboolean sgen_ptr_in_nursery (void *p) MONO_INTERNAL;
  42
  43
  44 /*How many bytes a single card covers*/
  45 #define CARD_BITS 9
  46
  47 /* How many bits of the address space is covered by the card table.
  48  * If this value is smaller than the number of address bits, card aliasing is required.
  49  */
  50 #define CARD_TABLE_BITS 32
  51
  52 #define CARD_SIZE_IN_BYTES (1 << CARD_BITS)
  53 #define CARD_COUNT_BITS (CARD_TABLE_BITS - CARD_BITS)
  54 #define CARD_COUNT_IN_BYTES (1 << CARD_COUNT_BITS)
  55 #define CARD_MASK ((1 << CARD_COUNT_BITS) - 1)
  56
  57 #if SIZEOF_VOID_P * 8 > CARD_TABLE_BITS
  58 #define SGEN_HAVE_OVERLAPPING_CARDS     1
  59 #endif
  60
  61 extern guint8 *sgen_cardtable MONO_INTERNAL;
  62
  63
  64 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
  65
  66 static inline guint8*
  67 sgen_card_table_get_card_address (mword address)
  68 {
  69         return sgen_cardtable + ((address >> CARD_BITS) & CARD_MASK);
  70 }
  71
  72 extern guint8 *sgen_shadow_cardtable MONO_INTERNAL;
  73
  74 static inline  guint8*
  75 sgen_card_table_get_shadow_card_address (mword address)
  76 {
  77         return sgen_shadow_cardtable + ((address >> CARD_BITS) & CARD_MASK);
  78 }
  79
  80 static inline gboolean
  81 sgen_card_table_card_begin_scanning (mword address)
  82 {
  83         return *sgen_card_table_get_shadow_card_address (address) != 0;
  84 }
  85
  86 static inline void
  87 sgen_card_table_prepare_card_for_scanning (guint8 *card)
  88 {
  89 }
  90
  91 #define sgen_card_table_get_card_scan_address sgen_card_table_get_shadow_card_address
  92
  93 #else
  94
  95 static inline guint8*
  96 sgen_card_table_get_card_address (mword address)
  97 {
  98         return sgen_cardtable + (address >> CARD_BITS);
  99 }
 100
 101 static inline gboolean
 102 sgen_card_table_card_begin_scanning (mword address)
 103 {
 104         guint8 *card = sgen_card_table_get_card_address (address);
 105         gboolean res = *card;
 106         *card = 0;
 107         return res;
 108 }
 109
 110 static inline void
 111 sgen_card_table_prepare_card_for_scanning (guint8 *card)
 112 {
 113         *card = 0;
 114 }
 115
 116 #define sgen_card_table_get_card_scan_address sgen_card_table_get_card_address
 117
 118 #endif
 119
 120 static inline gboolean
 121 sgen_card_table_address_is_marked (mword address)
 122 {
 123         return *sgen_card_table_get_card_address (address) != 0;
 124 }
 125
 126 static inline void
 127 sgen_card_table_mark_address (mword address)
 128 {
 129         *sgen_card_table_get_card_address (address) = 1;
 130 }
 131
 132
 133 #else /*if SGEN_HAVE_CARDTABLE */
 134
 135 void
 136 sgen_card_table_mark_address (mword address)
 137 {
 138         g_assert_not_reached ();
 139 }
 140
 141 void
 142 sgen_card_table_mark_range (mword address, mword size)
 143 {
 144         g_assert_not_reached ();
 145 }
 146
 147 #define sgen_card_table_address_is_marked(p)    FALSE
 148 #define sgen_scan_from_card_tables(start,end,queue)
 149 #define sgen_card_table_clear()
 150 #define sgen_card_table_init()
 151 #define sgen_card_tables_collect_stats(begin)
 152
 153 guint8*
 154 mono_gc_get_card_table (int *shift_bits, gpointer *mask)
 155 {
 156         return NULL;
 157 }
 158
 159 #endif
 160
 161
 162
 163 #endif