diff options
Diffstat (limited to 'lib/hash.h')
| -rw-r--r-- | lib/hash.h | 115 |
1 files changed, 86 insertions, 29 deletions
@@ -3,7 +3,9 @@ #define HASH(type) struct { type **data; uint count, order; } #define HASH_TYPE(v) typeof(** (v).data) #define HASH_SIZE(v) (1 << (v).order) -#define HASH_MASK(v) ((1 << (v).order)-1) + +#define HASH_EQ(v,id,k1,k2...) (id##_EQ(k1, k2)) +#define HASH_FN(v,id,key...) ((u32) (id##_FN(key)) >> (32 - (v).order)) #define HASH_INIT(v,pool,init_order) \ @@ -15,16 +17,16 @@ #define HASH_FIND(v,id,key...) \ ({ \ - uint _h = id##_FN((key)) & HASH_MASK(v); \ + u32 _h = HASH_FN(v, id, key); \ HASH_TYPE(v) *_n = (v).data[_h]; \ - while (_n && !id##_EQ(id##_KEY(_n), (key))) \ + while (_n && !HASH_EQ(v, id, id##_KEY(_n), key)) \ _n = id##_NEXT(_n); \ _n; \ }) #define HASH_INSERT(v,id,node) \ ({ \ - uint _h = id##_FN(id##_KEY((node))) & HASH_MASK(v); \ + u32 _h = HASH_FN(v, id, id##_KEY((node))); \ HASH_TYPE(v) **_nn = (v).data + _h; \ id##_NEXT(node) = *_nn; \ *_nn = node; \ @@ -33,72 +35,117 @@ #define HASH_DO_REMOVE(v,id,_nn) \ ({ \ - HASH_TYPE(v) *_n = *_nn; \ - if (_n) \ - { \ - *_nn = id##_NEXT(_n); \ - (v).count--; \ - } \ - _n; \ + *_nn = id##_NEXT((*_nn)); \ + (v).count--; \ }) #define HASH_DELETE(v,id,key...) \ ({ \ - uint _h = id##_FN((key)) & HASH_MASK(v); \ - HASH_TYPE(v) **_nn = (v).data + _h; \ + u32 _h = HASH_FN(v, id, key); \ + HASH_TYPE(v) *_n, **_nn = (v).data + _h; \ \ - while ((*_nn) && !id##_EQ(id##_KEY((*_nn)), (key))) \ + while ((*_nn) && !HASH_EQ(v, id, id##_KEY((*_nn)), key)) \ _nn = &(id##_NEXT((*_nn))); \ \ - HASH_DO_REMOVE(v,id,_nn); \ + if (_n = *_nn) \ + HASH_DO_REMOVE(v,id,_nn); \ + _n; \ }) #define HASH_REMOVE(v,id,node) \ ({ \ - uint _h = id##_FN(id##_KEY((node))) & HASH_MASK(v); \ - HASH_TYPE(v) **_nn = (v).data + _h; \ + u32 _h = HASH_FN(v, id, id##_KEY((node))); \ + HASH_TYPE(v) *_n, **_nn = (v).data + _h; \ \ while ((*_nn) && (*_nn != (node))) \ _nn = &(id##_NEXT((*_nn))); \ \ - HASH_DO_REMOVE(v,id,_nn); \ + if (_n = *_nn) \ + HASH_DO_REMOVE(v,id,_nn); \ + _n; \ }) #define HASH_REHASH(v,id,pool,step) \ ({ \ HASH_TYPE(v) *_n, *_n2, **_od; \ - uint _i, _s; \ + uint _i, _os; \ \ - _s = HASH_SIZE(v); \ + _os = HASH_SIZE(v); \ _od = (v).data; \ (v).count = 0; \ (v).order += (step); \ (v).data = mb_allocz(pool, HASH_SIZE(v) * sizeof(* (v).data)); \ \ - for (_i = 0; _i < _s; _i++) \ + for (_i = 0; _i < _os; _i++) \ for (_n = _od[_i]; _n && (_n2 = id##_NEXT(_n), 1); _n = _n2) \ HASH_INSERT(v, id, _n); \ \ mb_free(_od); \ }) -#define HASH_DEFINE_REHASH_FN(id, type) \ - static void id##_REHASH_FN(void *v, pool *p, int step) \ +#define REHASH_LO_MARK(a,b,c,d,e,f) a +#define REHASH_HI_MARK(a,b,c,d,e,f) b +#define REHASH_LO_STEP(a,b,c,d,e,f) c +#define REHASH_HI_STEP(a,b,c,d,e,f) d +#define REHASH_LO_BOUND(a,b,c,d,e,f) e +#define REHASH_HI_BOUND(a,b,c,d,e,f) f + +#define HASH_DEFINE_REHASH_FN(id,type) \ + static void id##_REHASH(void *v, pool *p, int step) \ { HASH_REHASH(* (HASH(type) *) v, id, p, step); } -#define HASH_TRY_REHASH_UP(v,id,pool) \ + +#define HASH_MAY_STEP_UP(v,id,pool) HASH_MAY_STEP_UP_(v,pool, id##_REHASH, id##_PARAMS) +#define HASH_MAY_STEP_DOWN(v,id,pool) HASH_MAY_STEP_DOWN_(v,pool, id##_REHASH, id##_PARAMS) +#define HASH_MAY_RESIZE_DOWN(v,id,pool) HASH_MAY_RESIZE_DOWN_(v,pool, id##_REHASH, id##_PARAMS) + +#define HASH_MAY_STEP_UP_(v,pool,rehash_fn,args) \ + ({ \ + if (((v).count > (HASH_SIZE(v) REHASH_HI_MARK(args))) && \ + ((v).order < (REHASH_HI_BOUND(args)))) \ + rehash_fn(&(v), pool, REHASH_HI_STEP(args)); \ + }) + +#define HASH_MAY_STEP_DOWN_(v,pool,rehash_fn,args) \ + ({ \ + if (((v).count < (HASH_SIZE(v) REHASH_LO_MARK(args))) && \ + ((v).order > (REHASH_LO_BOUND(args)))) \ + rehash_fn(&(v), pool, -(REHASH_LO_STEP(args))); \ + }) + +#define HASH_MAY_RESIZE_DOWN_(v,pool,rehash_fn,args) \ + ({ \ + int _o = (v).order; \ + while (((v).count < ((1 << _o) REHASH_LO_MARK(args))) && \ + (_o > (REHASH_LO_BOUND(args)))) \ + _o -= (REHASH_LO_STEP(args)); \ + if (_o < (v).order) \ + rehash_fn(&(v), pool, _o - (int) (v).order); \ + }) + + +#define HASH_INSERT2(v,id,pool,node) \ ({ \ - if (((v).order < id##_REHASH_MAX) && ((v).count > HASH_SIZE(v))) \ - id##_REHASH_FN(&v, pool, 1); \ + HASH_INSERT(v, id, node); \ + HASH_MAY_STEP_UP(v, id, pool); \ }) -#define HASH_TRY_REHASH_DOWN(v,id,pool) \ +#define HASH_DELETE2(v,id,pool,key...) \ ({ \ - if (((v).order > id##_REHASH_MIN) && ((v).count < HASH_SIZE(v)/2)) \ - id##_REHASH_FN(&v, pool, -1); \ + HASH_TYPE(v) *_n = HASH_DELETE(v, id, key); \ + if (_n) HASH_MAY_STEP_DOWN(v, id, pool); \ + _n; \ + }) + +#define HASH_REMOVE2(v,id,pool,node) \ + ({ \ + HASH_TYPE(v) *_n = HASH_REMOVE(v, id, node); \ + if (_n) HASH_MAY_STEP_DOWN(v, id, pool); \ + _n; \ }) + #define HASH_WALK(v,next,n) \ do { \ HASH_TYPE(v) *n; \ @@ -121,3 +168,13 @@ #define HASH_WALK_DELSAFE_END } while (0) +#define HASH_WALK_FILTER(v,next,n,nn) \ + do { \ + HASH_TYPE(v) *n, **nn; \ + uint _i; \ + uint _s = HASH_SIZE(v); \ + for (_i = 0; _i < _s; _i++) \ + for (nn = (v).data + _i; n = *nn; (*nn == n) ? (nn = &n->next) : NULL) + +#define HASH_WALK_FILTER_END } while (0) + |