mono/sgen/sgen-cardtable.h

   1 /*
   2  * Copyright 2001-2003 Ximian, Inc
   3  * Copyright 2003-2010 Novell, Inc.
   4  *
   5  * Licensed under the MIT license. See LICENSE file in the project root for full license information.
   6  */
   7 #ifndef __MONO_SGEN_CARD_TABLE_INLINES_H__
   8 #define __MONO_SGEN_CARD_TABLE_INLINES_H__
   9
  10 /*WARNING: This function returns the number of cards regardless of overflow in case of overlapping cards.*/
  11 mword sgen_card_table_number_of_cards_in_range (mword address, mword size);
  12
  13 void sgen_card_table_reset_region (mword start, mword end);
  14 void* sgen_card_table_align_pointer (void *ptr);
  15 void sgen_card_table_mark_range (mword address, mword size);
  16 void sgen_cardtable_scan_object (GCObject *obj, mword obj_size, guint8 *cards,
  17                 ScanCopyContext ctx);
  18
  19 gboolean sgen_card_table_get_card_data (guint8 *dest, mword address, mword cards);
  20
  21 guint8* sgen_card_table_alloc_mod_union (char *obj, mword obj_size);
  22 void sgen_card_table_free_mod_union (guint8 *mod_union, char *obj, mword obj_size);
  23
  24 void sgen_card_table_update_mod_union_from_cards (guint8 *dest, guint8 *start_card, size_t num_cards);
  25 void sgen_card_table_update_mod_union (guint8 *dest, char *obj, mword obj_size, size_t *out_num_cards);
  26 void sgen_card_table_preclean_mod_union (guint8 *cards, guint8 *cards_preclean, size_t num_cards);
  27
  28 guint8* sgen_get_card_table_configuration (int *shift_bits, gpointer *mask);
  29
  30 void sgen_card_table_init (SgenRememberedSet *remset);
  31
  32 /*How many bytes a single card covers*/
  33 #define CARD_BITS 9
  34
  35 /* How many bits of the address space is covered by the card table.
  36  * If this value is smaller than the number of address bits, card aliasing is required.
  37  */
  38 #define CARD_TABLE_BITS 32
  39
  40 #define CARD_SIZE_IN_BYTES (1 << CARD_BITS)
  41 #define CARD_COUNT_BITS (CARD_TABLE_BITS - CARD_BITS)
  42 #define CARD_COUNT_IN_BYTES (1 << CARD_COUNT_BITS)
  43 #define CARD_MASK ((1 << CARD_COUNT_BITS) - 1)
  44
  45 #if SIZEOF_VOID_P * 8 > CARD_TABLE_BITS
  46 #define SGEN_HAVE_OVERLAPPING_CARDS     1
  47 #endif
  48
  49 extern guint8 *sgen_cardtable;
  50
  51
  52 #ifdef SGEN_HAVE_OVERLAPPING_CARDS
  53
  54 static inline guint8*
  55 sgen_card_table_get_card_address (mword address)
  56 {
  57         return sgen_cardtable + ((address >> CARD_BITS) & CARD_MASK);
  58 }
  59
  60 extern guint8 *sgen_shadow_cardtable;
  61
  62 #define SGEN_SHADOW_CARDTABLE_END (sgen_shadow_cardtable + CARD_COUNT_IN_BYTES)
  63
  64 static inline guint8*
  65 sgen_card_table_get_shadow_card_address (mword address)
  66 {
  67         return sgen_shadow_cardtable + ((address >> CARD_BITS) & CARD_MASK);
  68 }
  69
  70 static inline gboolean
  71 sgen_card_table_card_begin_scanning (mword address)
  72 {
  73         return *sgen_card_table_get_shadow_card_address (address) != 0;
  74 }
  75
  76 static inline void
  77 sgen_card_table_prepare_card_for_scanning (guint8 *card)
  78 {
  79 }
  80
  81 #define sgen_card_table_get_card_scan_address sgen_card_table_get_shadow_card_address
  82
  83 #else
  84
  85 static inline guint8*
  86 sgen_card_table_get_card_address (mword address)
  87 {
  88         return sgen_cardtable + (address >> CARD_BITS);
  89 }
  90
  91 static inline gboolean
  92 sgen_card_table_card_begin_scanning (mword address)
  93 {
  94         guint8 *card = sgen_card_table_get_card_address (address);
  95         gboolean res = *card;
  96         *card = 0;
  97         return res;
  98 }
  99
 100 static inline void
 101 sgen_card_table_prepare_card_for_scanning (guint8 *card)
 102 {
 103         *card = 0;
 104 }
 105
 106 #define sgen_card_table_get_card_scan_address sgen_card_table_get_card_address
 107
 108 #endif
 109
 110 static inline gboolean
 111 sgen_card_table_address_is_marked (mword address)
 112 {
 113         return *sgen_card_table_get_card_address (address) != 0;
 114 }
 115
 116 static inline void
 117 sgen_card_table_mark_address (mword address)
 118 {
 119         *sgen_card_table_get_card_address (address) = 1;
 120 }
 121
 122 static inline size_t
 123 sgen_card_table_get_card_offset (char *ptr, char *base)
 124 {
 125         return (ptr - base) >> CARD_BITS;
 126 }
 127
 128 #endif