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https://gitlab.nic.cz/labs/bird.git
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9b471e72d7
The symbol table used just symbol name as a key, and used a trick with active flag to find symbols in active scopes with one hash table lookup. The disadvantage is that it can degenerate to O(n) for negative queries in situations where are many symbols with the same name in different scopes. Thanks to Yanko Kaneti for the bugreport.
247 lines
6.4 KiB
C
247 lines
6.4 KiB
C
/*
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* BIRD Library -- Generic Hash Table
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*
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* (c) 2013 Ondrej Zajicek <santiago@crfreenet.org>
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* (c) 2013 CZ.NIC z.s.p.o.
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#ifndef _BIRD_HASH_H_
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#define _BIRD_HASH_H_
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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) (1U << (v).order)
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#define HASH_EQ(v,id,k1,k2...) (id##_EQ(k1, k2))
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#define HASH_FN(v,id,key...) ((u32) (id##_FN(key)) >> (32 - (v).order))
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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_FREE(v) \
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({ \
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mb_free((v).data); \
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(v) = (typeof(v)){ }; \
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})
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#define HASH_FIND(v,id,key...) \
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({ \
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u32 _h = HASH_FN(v, id, key); \
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HASH_TYPE(v) *_n = (v).data[_h]; \
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while (_n && !HASH_EQ(v, id, 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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u32 _h = HASH_FN(v, id, id##_KEY((node))); \
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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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*_nn = id##_NEXT((*_nn)); \
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(v).count--; \
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})
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#define HASH_DELETE(v,id,key...) \
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({ \
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u32 _h = HASH_FN(v, id, key); \
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HASH_TYPE(v) *_n, **_nn = (v).data + _h; \
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\
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while ((*_nn) && !HASH_EQ(v, id, id##_KEY((*_nn)), key)) \
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_nn = &(id##_NEXT((*_nn))); \
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\
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if (_n = *_nn) \
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HASH_DO_REMOVE(v,id,_nn); \
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_n; \
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})
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#define HASH_REMOVE(v,id,node) \
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({ \
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u32 _h = HASH_FN(v, id, id##_KEY((node))); \
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HASH_TYPE(v) *_n, **_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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if (_n = *_nn) \
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HASH_DO_REMOVE(v,id,_nn); \
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_n; \
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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, _os; \
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\
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_os = 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 < _os; _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 REHASH_LO_MARK(a,b,c,d,e,f) a
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#define REHASH_HI_MARK(a,b,c,d,e,f) b
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#define REHASH_LO_STEP(a,b,c,d,e,f) c
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#define REHASH_HI_STEP(a,b,c,d,e,f) d
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#define REHASH_LO_BOUND(a,b,c,d,e,f) e
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#define REHASH_HI_BOUND(a,b,c,d,e,f) f
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#define HASH_DEFINE_REHASH_FN(id,type) \
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static void id##_REHASH(void *v, pool *p, int step) \
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{ HASH_REHASH(* (HASH(type) *) v, id, p, step); }
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#define HASH_MAY_STEP_UP(v,id,pool) HASH_MAY_STEP_UP_(v,pool, id##_REHASH, id##_PARAMS)
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#define HASH_MAY_STEP_DOWN(v,id,pool) HASH_MAY_STEP_DOWN_(v,pool, id##_REHASH, id##_PARAMS)
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#define HASH_MAY_RESIZE_DOWN(v,id,pool) HASH_MAY_RESIZE_DOWN_(v,pool, id##_REHASH, id##_PARAMS)
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#define HASH_MAY_STEP_UP_(v,pool,rehash_fn,args) \
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({ \
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if (((v).count > (HASH_SIZE(v) REHASH_HI_MARK(args))) && \
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((v).order < (REHASH_HI_BOUND(args)))) \
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rehash_fn(&(v), pool, REHASH_HI_STEP(args)); \
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})
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#define HASH_MAY_STEP_DOWN_(v,pool,rehash_fn,args) \
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({ \
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if (((v).count < (HASH_SIZE(v) REHASH_LO_MARK(args))) && \
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((v).order > (REHASH_LO_BOUND(args)))) \
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rehash_fn(&(v), pool, -(REHASH_LO_STEP(args))); \
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})
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#define HASH_MAY_RESIZE_DOWN_(v,pool,rehash_fn,args) \
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({ \
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uint _o = (v).order; \
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while (((v).count < ((1U << _o) REHASH_LO_MARK(args))) && \
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(_o > (REHASH_LO_BOUND(args)))) \
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_o -= (REHASH_LO_STEP(args)); \
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if (_o < (v).order) \
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rehash_fn(&(v), pool, _o - (v).order); \
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})
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#define HASH_INSERT2(v,id,pool,node) \
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({ \
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HASH_INSERT(v, id, node); \
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HASH_MAY_STEP_UP(v, id, pool); \
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})
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#define HASH_DELETE2(v,id,pool,key...) \
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({ \
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HASH_TYPE(v) *_n = HASH_DELETE(v, id, key); \
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if (_n) HASH_MAY_STEP_DOWN(v, id, pool); \
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_n; \
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})
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#define HASH_REMOVE2(v,id,pool,node) \
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({ \
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HASH_TYPE(v) *_n = HASH_REMOVE(v, id, node); \
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if (_n) HASH_MAY_STEP_DOWN(v, id, pool); \
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_n; \
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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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#define HASH_WALK_FILTER(v,next,n,nn) \
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do { \
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HASH_TYPE(v) *n, **nn; \
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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 (nn = (v).data + _i; n = *nn; (*nn == n) ? (nn = &n->next) : NULL)
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#define HASH_WALK_FILTER_END } while (0)
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static inline void
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mem_hash_init(u64 *h)
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{
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*h = 0x001047d54778bcafULL;
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}
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static inline void
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mem_hash_mix(u64 *h, const void *p, uint s)
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{
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const u64 multiplier = 0xb38bc09a61202731ULL;
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const char *pp = p;
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uint i;
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for (i=0; i<s/4; i++)
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*h = *h * multiplier + ((const u32 *)pp)[i];
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for (i=s & ~0x3; i<s; i++)
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*h = *h * multiplier + pp[i];
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}
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static inline void
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mem_hash_mix_num(u64 *h, u64 val)
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{
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mem_hash_mix(h, &val, sizeof(val));
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}
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static inline uint
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mem_hash_value(u64 *h)
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{
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return ((*h >> 32) ^ (*h & 0xffffffff));
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}
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static inline uint
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mem_hash(const void *p, uint s)
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{
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static u64 h;
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mem_hash_init(&h);
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mem_hash_mix(&h, p, s);
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return mem_hash_value(&h);
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}
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static inline uint
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ptr_hash(const void *ptr)
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{
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uintptr_t p = (uintptr_t) ptr;
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return p ^ (p << 8) ^ (p >> 16);
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}
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#endif
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