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 void sgen_card_table_reset_region (mword start, mword end) MONO_INTERNAL;
  28 void* sgen_card_table_align_pointer (void *ptr) MONO_INTERNAL;
  29 void sgen_card_table_mark_range (mword address, mword size) MONO_INTERNAL;
  30 void sgen_cardtable_scan_object (char *obj, mword obj_size, guint8 *cards,
  31                 gboolean mod_union, SgenGrayQueue *queue) MONO_INTERNAL;
  32
  33 gboolean sgen_card_table_get_card_data (guint8 *dest, mword address, mword cards) MONO_INTERNAL;
  34
  35 guint8* sgen_card_table_update_mod_union_from_cards (guint8 *dest, guint8 *start_card, size_t num_cards) MONO_INTERNAL;
  36 guint8* sgen_card_table_update_mod_union (guint8 *dest, char *obj, mword obj_size, size_t *out_num_cards) MONO_INTERNAL;
  37
  38 void sgen_card_table_init (SgenRemeberedSet *remset) MONO_INTERNAL;
  39
  40 /*How many bytes a single card covers*/
  41 #define CARD_BITS 9
  42
  43 /* How many bits of the address space is covered by the card table.
  44  * If this value is smaller than the number of address bits, card aliasing is required.
  45  */
  46 #define CARD_TABLE_BITS 32
  47
  48 #define CARD_SIZE_IN_BYTES (1 << CARD_BITS)
  49 #define CARD_COUNT_BITS (CARD_TABLE_BITS - CARD_BITS)
  50 #define CARD_COUNT_IN_BYTES (1 << CARD_COUNT_BITS)
  51 #define CARD_MASK ((1 << CARD_COUNT_BITS) - 1)
  52
  53 #if SIZEOF_VOID_P * 8 > CARD_TABLE_BITS
  54 #define SGEN_HAVE_OVERLAPPING_CARDS     1
  55 #endif
  56
  57 extern guint8 *sgen_cardtable MONO_INTERNAL;
  58
  59
  60 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
  61
  62 static inline guint8*
  63 sgen_card_table_get_card_address (mword address)
  64 {
  65         return sgen_cardtable + ((address >> CARD_BITS) & CARD_MASK);
  66 }
  67
  68 extern guint8 *sgen_shadow_cardtable MONO_INTERNAL;
  69
  70 static inline guint8*
  71 sgen_card_table_get_shadow_card_address (mword address)
  72 {
  73         return sgen_shadow_cardtable + ((address >> CARD_BITS) & CARD_MASK);
  74 }
  75
  76 static inline gboolean
  77 sgen_card_table_card_begin_scanning (mword address)
  78 {
  79         return *sgen_card_table_get_shadow_card_address (address) != 0;
  80 }
  81
  82 static inline void
  83 sgen_card_table_prepare_card_for_scanning (guint8 *card)
  84 {
  85 }
  86
  87 #define sgen_card_table_get_card_scan_address sgen_card_table_get_shadow_card_address
  88
  89 #else
  90
  91 static inline guint8*
  92 sgen_card_table_get_card_address (mword address)
  93 {
  94         return sgen_cardtable + (address >> CARD_BITS);
  95 }
  96
  97 static inline gboolean
  98 sgen_card_table_card_begin_scanning (mword address)
  99 {
 100         guint8 *card = sgen_card_table_get_card_address (address);
 101         gboolean res = *card;
 102         *card = 0;
 103         return res;
 104 }
 105
 106 static inline void
 107 sgen_card_table_prepare_card_for_scanning (guint8 *card)
 108 {
 109         *card = 0;
 110 }
 111
 112 #define sgen_card_table_get_card_scan_address sgen_card_table_get_card_address
 113
 114 #endif
 115
 116 static inline gboolean
 117 sgen_card_table_address_is_marked (mword address)
 118 {
 119         return *sgen_card_table_get_card_address (address) != 0;
 120 }
 121
 122 static inline void
 123 sgen_card_table_mark_address (mword address)
 124 {
 125         *sgen_card_table_get_card_address (address) = 1;
 126 }
 127
 128 #endif