52 lines
988 B
C++
52 lines
988 B
C++
namespace factor
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{
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static const cell free_list_count = 32;
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static const cell allocation_page_size = 1024;
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struct free_heap_block
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{
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cell header;
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bool free_p() const
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{
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return (header & 1) == 1;
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}
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cell size() const
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{
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return header & ~7;
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}
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void make_free(cell size)
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{
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header = size | 1;
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}
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};
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struct block_size_compare {
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bool operator()(free_heap_block *a, free_heap_block *b)
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{
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return a->size() < b->size();
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}
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};
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typedef std::multiset<free_heap_block *, block_size_compare> large_block_set;
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struct free_list {
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std::vector<free_heap_block *> small_blocks[free_list_count];
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large_block_set large_blocks;
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cell free_block_count;
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cell free_space;
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void clear_free_list();
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void initial_free_list(cell start, cell end, cell occupied);
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void add_to_free_list(free_heap_block *block);
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free_heap_block *find_free_block(cell size);
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free_heap_block *split_free_block(free_heap_block *block, cell size);
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bool can_allot_p(cell size);
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cell largest_free_block();
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};
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}
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