67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
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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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/* if CARD_POINTS_TO_NURSERY is set, CARD_POINTS_TO_AGING must also be set. */
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#define CARD_POINTS_TO_NURSERY 0x80
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#define CARD_POINTS_TO_AGING 0x40
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#define CARD_MARK_MASK (CARD_POINTS_TO_NURSERY | CARD_POINTS_TO_AGING)
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typedef u8 F_CARD;
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#define CARD_BITS 8
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#define CARD_SIZE (1<<CARD_BITS)
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#define ADDR_CARD_MASK (CARD_SIZE-1)
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DLLEXPORT CELL cards_offset;
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#define ADDR_TO_CARD(a) (F_CARD*)(((CELL)(a) >> CARD_BITS) + cards_offset)
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#define CARD_TO_ADDR(c) (CELL*)(((CELL)(c) - cards_offset)<<CARD_BITS)
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typedef u8 F_DECK;
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#define DECK_BITS (CARD_BITS + 10)
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#define DECK_SIZE (1<<DECK_BITS)
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#define ADDR_DECK_MASK (DECK_SIZE-1)
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DLLEXPORT CELL decks_offset;
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#define ADDR_TO_DECK(a) (F_DECK*)(((CELL)(a) >> DECK_BITS) + decks_offset)
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#define DECK_TO_ADDR(c) (CELL*)(((CELL)(c) - decks_offset) << DECK_BITS)
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#define DECK_TO_CARD(d) (F_CARD*)((((CELL)(d) - decks_offset) << (DECK_BITS - CARD_BITS)) + cards_offset)
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#define ADDR_TO_ALLOT_MARKER(a) (F_CARD*)(((CELL)(a) >> CARD_BITS) + allot_markers_offset)
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#define CARD_OFFSET(c) (*((c) - (CELL)data_heap->cards + (CELL)data_heap->allot_markers))
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#define INVALID_ALLOT_MARKER 0xff
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DLLEXPORT CELL allot_markers_offset;
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/* the write barrier must be called any time we are potentially storing a
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pointer from an older generation to a younger one */
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INLINE void write_barrier(CELL address)
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{
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*ADDR_TO_CARD(address) = CARD_MARK_MASK;
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*ADDR_TO_DECK(address) = CARD_MARK_MASK;
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}
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#define SLOT(obj,slot) (UNTAG(obj) + (slot) * CELLS)
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INLINE void set_slot(CELL obj, CELL slot, CELL value)
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{
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put(SLOT(obj,slot),value);
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write_barrier(obj);
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}
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/* we need to remember the first object allocated in the card */
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INLINE void allot_barrier(CELL address)
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{
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F_CARD *ptr = ADDR_TO_ALLOT_MARKER(address);
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if(*ptr == INVALID_ALLOT_MARKER)
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*ptr = (address & ADDR_CARD_MASK);
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}
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