2009-05-02 05:04:19 -04:00
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/* card marking write barrier. a card is a byte storing a mark flag,
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and the offset (in cells) of the first object in the card.
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the mark flag is set by the write barrier when an object in the
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card has a slot written to.
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the offset of the first object is set by the allocator. */
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2009-05-04 02:46:13 -04:00
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namespace factor
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{
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2009-05-08 16:05:55 -04:00
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/* if card_points_to_nursery is set, card_points_to_aging must also be set. */
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static const cell card_points_to_nursery = 0x80;
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static const cell card_points_to_aging = 0x40;
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static const cell card_mark_mask = (card_points_to_nursery | card_points_to_aging);
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2009-05-04 05:50:24 -04:00
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typedef u8 card;
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2009-05-02 05:04:19 -04:00
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2009-05-08 16:05:55 -04:00
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static const cell card_bits = 8;
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static const cell card_size = (1<<card_bits);
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static const cell addr_card_mask = (card_size-1);
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2009-05-02 05:04:19 -04:00
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2009-08-17 16:37:10 -04:00
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2009-05-04 05:50:24 -04:00
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typedef u8 card_deck;
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2009-05-02 05:04:19 -04:00
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2009-05-08 16:05:55 -04:00
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static const cell deck_bits = (card_bits + 10);
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static const cell deck_size = (1<<deck_bits);
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static const cell addr_deck_mask = (deck_size-1);
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static const cell invalid_allot_marker = 0xff;
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2009-05-04 05:50:24 -04:00
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2009-05-04 02:46:13 -04:00
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}
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