mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-12-22 01:31:55 +00:00
124 lines
3.3 KiB
C
124 lines
3.3 KiB
C
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#define HASH(type) struct { type **data; uint count, order; }
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#define HASH_TYPE(v) typeof(** (v).data)
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#define HASH_SIZE(v) (1 << (v).order)
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#define HASH_MASK(v) ((1 << (v).order)-1)
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#define HASH_INIT(v,pool,init_order) \
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({ \
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(v).count = 0; \
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(v).order = (init_order); \
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(v).data = mb_allocz(pool, HASH_SIZE(v) * sizeof(* (v).data)); \
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})
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#define HASH_FIND(v,id,key...) \
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({ \
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uint _h = id##_FN((key)) & HASH_MASK(v); \
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HASH_TYPE(v) *_n = (v).data[_h]; \
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while (_n && !id##_EQ(id##_KEY(_n), (key))) \
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_n = id##_NEXT(_n); \
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_n; \
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})
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#define HASH_INSERT(v,id,node) \
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({ \
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uint _h = id##_FN(id##_KEY((node))) & HASH_MASK(v); \
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HASH_TYPE(v) **_nn = (v).data + _h; \
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id##_NEXT(node) = *_nn; \
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*_nn = node; \
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(v).count++; \
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})
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#define HASH_DO_REMOVE(v,id,_nn) \
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({ \
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HASH_TYPE(v) *_n = *_nn; \
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if (_n) \
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{ \
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*_nn = id##_NEXT(_n); \
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(v).count--; \
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} \
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_n; \
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})
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#define HASH_DELETE(v,id,key...) \
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({ \
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uint _h = id##_FN((key)) & HASH_MASK(v); \
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HASH_TYPE(v) **_nn = (v).data + _h; \
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\
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while ((*_nn) && !id##_EQ(id##_KEY((*_nn)), (key))) \
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_nn = &(id##_NEXT((*_nn))); \
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\
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HASH_DO_REMOVE(v,id,_nn); \
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})
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#define HASH_REMOVE(v,id,node) \
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({ \
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uint _h = id##_FN(id##_KEY((node))) & HASH_MASK(v); \
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HASH_TYPE(v) **_nn = (v).data + _h; \
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\
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while ((*_nn) && (*_nn != (node))) \
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_nn = &(id##_NEXT((*_nn))); \
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\
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HASH_DO_REMOVE(v,id,_nn); \
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})
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#define HASH_REHASH(v,id,pool,step) \
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({ \
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HASH_TYPE(v) *_n, *_n2, **_od; \
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uint _i, _s; \
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\
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_s = HASH_SIZE(v); \
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_od = (v).data; \
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(v).count = 0; \
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(v).order += (step); \
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(v).data = mb_allocz(pool, HASH_SIZE(v) * sizeof(* (v).data)); \
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\
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for (_i = 0; _i < _s; _i++) \
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for (_n = _od[_i]; _n && (_n2 = id##_NEXT(_n), 1); _n = _n2) \
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HASH_INSERT(v, id, _n); \
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\
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mb_free(_od); \
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})
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#define HASH_DEFINE_REHASH_FN(id, type) \
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static void id##_REHASH_FN(void *v, pool *p, int step) \
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{ HASH_REHASH(* (HASH(type) *) v, id, p, step); }
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#define HASH_TRY_REHASH_UP(v,id,pool) \
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({ \
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if (((v).order < id##_REHASH_MAX) && ((v).count > HASH_SIZE(v))) \
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id##_REHASH_FN(&v, pool, 1); \
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})
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#define HASH_TRY_REHASH_DOWN(v,id,pool) \
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({ \
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if (((v).order > id##_REHASH_MIN) && ((v).count < HASH_SIZE(v)/2)) \
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id##_REHASH_FN(&v, pool, -1); \
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})
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#define HASH_WALK(v,next,n) \
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do { \
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HASH_TYPE(v) *n; \
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uint _i; \
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uint _s = HASH_SIZE(v); \
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for (_i = 0; _i < _s; _i++) \
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for (n = (v).data[_i]; n; n = n->next)
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#define HASH_WALK_END } while (0)
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#define HASH_WALK_DELSAFE(v,next,n) \
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do { \
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HASH_TYPE(v) *n, *_next; \
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uint _i; \
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uint _s = HASH_SIZE(v); \
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for (_i = 0; _i < _s; _i++) \
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for (n = (v).data[_i]; n && (_next = n->next, 1); n = _next)
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#define HASH_WALK_DELSAFE_END } while (0)
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