2 * Various storage structures (pool allocation, vector, hash table)
4 * Copyright (C) 1993, Eric Youngdale.
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
26 #include "wine/debug.h"
28 #include "dbghelp_private.h"
33 WINE_DEFAULT_DEBUG_CHANNEL(dbghelp);
42 void pool_init(struct pool* a, size_t arena_size)
44 list_init( &a->arena_list );
45 list_init( &a->arena_full );
46 a->arena_size = arena_size;
49 void pool_destroy(struct pool* pool)
51 struct pool_arena* arena;
52 struct pool_arena* next;
55 size_t alloc, used, num;
57 alloc = used = num = 0;
58 LIST_FOR_EACH_ENTRY( arena, &pool->arena_list, struct pool_arena, entry )
60 alloc += arena->end - (char *)arena;
61 used += arena->current - (char*)arena;
64 LIST_FOR_EACH_ENTRY( arena, &pool->arena_full, struct pool_arena, entry )
66 alloc += arena->end - (char *)arena;
67 used += arena->current - (char*)arena;
70 if (alloc == 0) alloc = 1; /* avoid division by zero */
71 FIXME("STATS: pool %p has allocated %u kbytes, used %u kbytes in %u arenas, non-allocation ratio: %.2f%%\n",
72 pool, (unsigned)(alloc >> 10), (unsigned)(used >> 10), (unsigned)num,
73 100.0 - (float)used / (float)alloc * 100.0);
76 LIST_FOR_EACH_ENTRY_SAFE( arena, next, &pool->arena_list, struct pool_arena, entry )
78 list_remove( &arena->entry );
79 HeapFree(GetProcessHeap(), 0, arena);
81 LIST_FOR_EACH_ENTRY_SAFE( arena, next, &pool->arena_full, struct pool_arena, entry )
83 list_remove( &arena->entry );
84 HeapFree(GetProcessHeap(), 0, arena);
88 void* pool_alloc(struct pool* pool, size_t len)
90 struct pool_arena* arena;
94 len = (len + 3) & ~3; /* round up size on DWORD boundary */
96 LIST_FOR_EACH_ENTRY( arena, &pool->arena_list, struct pool_arena, entry )
98 if (arena->end - arena->current >= len)
100 ret = arena->current;
101 arena->current += len;
102 if (arena->current + 16 >= arena->end)
104 list_remove( &arena->entry );
105 list_add_tail( &pool->arena_full, &arena->entry );
111 size = max( pool->arena_size, len );
112 arena = HeapAlloc(GetProcessHeap(), 0, size + sizeof(struct pool_arena));
113 if (!arena) return NULL;
116 arena->current = (char*)ret + len;
117 arena->end = (char*)ret + size;
118 if (arena->current + 16 >= arena->end)
119 list_add_tail( &pool->arena_full, &arena->entry );
121 list_add_head( &pool->arena_list, &arena->entry );
125 char* pool_strdup(struct pool* pool, const char* str)
128 if ((ret = pool_alloc(pool, strlen(str) + 1))) strcpy(ret, str);
132 void vector_init(struct vector* v, unsigned esz, unsigned bucket_sz)
135 /* align size on DWORD boundaries */
136 v->elt_size = (esz + 3) & ~3;
139 case 2: v->shift = 1; break;
140 case 4: v->shift = 2; break;
141 case 8: v->shift = 3; break;
142 case 16: v->shift = 4; break;
143 case 32: v->shift = 5; break;
144 case 64: v->shift = 6; break;
145 case 128: v->shift = 7; break;
146 case 256: v->shift = 8; break;
147 case 512: v->shift = 9; break;
148 case 1024: v->shift = 10; break;
152 v->buckets_allocated = 0;
156 unsigned vector_length(const struct vector* v)
161 void* vector_at(const struct vector* v, unsigned pos)
165 if (pos >= v->num_elts) return NULL;
166 o = pos & ((1 << v->shift) - 1);
167 return (char*)v->buckets[pos >> v->shift] + o * v->elt_size;
170 void* vector_add(struct vector* v, struct pool* pool)
172 unsigned ncurr = v->num_elts++;
174 /* check that we don't wrap around */
175 assert(v->num_elts > ncurr);
176 if (ncurr == (v->num_buckets << v->shift))
178 if(v->num_buckets == v->buckets_allocated)
180 /* Double the bucket cache, so it scales well with big vectors.*/
181 unsigned new_reserved;
184 new_reserved = 2*v->buckets_allocated;
185 if(new_reserved == 0) new_reserved = 1;
187 /* Don't even try to resize memory.
188 Pool datastructure is very inefficient with reallocs. */
189 new = pool_alloc(pool, new_reserved * sizeof(void*));
190 memcpy(new, v->buckets, v->buckets_allocated * sizeof(void*));
192 v->buckets_allocated = new_reserved;
194 v->buckets[v->num_buckets] = pool_alloc(pool, v->elt_size << v->shift);
195 return v->buckets[v->num_buckets++];
197 return vector_at(v, ncurr);
200 /* We construct the sparse array as two vectors (of equal size)
201 * The first vector (key2index) is the lookup table between the key and
202 * an index in the second vector (elements)
203 * When inserting an element, it's always appended in second vector (and
204 * never moved in memory later on), only the first vector is reordered
212 void sparse_array_init(struct sparse_array* sa, unsigned elt_sz, unsigned bucket_sz)
214 vector_init(&sa->key2index, sizeof(struct key2index), bucket_sz);
215 vector_init(&sa->elements, elt_sz, bucket_sz);
218 /******************************************************************
219 * sparse_array_lookup
221 * Returns the first index which key is >= at passed key
223 static struct key2index* sparse_array_lookup(const struct sparse_array* sa,
224 unsigned long key, unsigned* idx)
226 struct key2index* pk2i;
229 if (!sa->elements.num_elts)
234 high = sa->elements.num_elts;
235 pk2i = vector_at(&sa->key2index, high - 1);
241 if (pk2i->key == key)
247 pk2i = vector_at(&sa->key2index, low);
248 if (pk2i->key >= key)
253 /* now we have: sa(lowest key) < key < sa(highest key) */
256 *idx = (low + high) / 2;
257 pk2i = vector_at(&sa->key2index, *idx);
258 if (pk2i->key > key) high = *idx;
259 else if (pk2i->key < key) low = *idx + 1;
262 /* binary search could return exact item, we search for highest one
266 pk2i = vector_at(&sa->key2index, ++(*idx));
270 void* sparse_array_find(const struct sparse_array* sa, unsigned long key)
273 struct key2index* pk2i;
275 if ((pk2i = sparse_array_lookup(sa, key, &idx)) && pk2i->key == key)
276 return vector_at(&sa->elements, pk2i->index);
280 void* sparse_array_add(struct sparse_array* sa, unsigned long key,
284 struct key2index* pk2i;
285 struct key2index* to;
287 pk2i = sparse_array_lookup(sa, key, &idx);
288 if (pk2i && pk2i->key == key)
290 FIXME("re adding an existing key\n");
293 to = vector_add(&sa->key2index, pool);
296 /* we need to shift vector's content... */
297 /* let's do it brute force... (FIXME) */
298 assert(sa->key2index.num_elts >= 2);
299 for (i = sa->key2index.num_elts - 1; i > idx; i--)
301 pk2i = vector_at(&sa->key2index, i - 1);
308 to->index = sa->elements.num_elts;
310 return vector_add(&sa->elements, pool);
313 unsigned sparse_array_length(const struct sparse_array* sa)
315 return sa->elements.num_elts;
318 static unsigned hash_table_hash(const char* name, unsigned num_buckets)
324 hash += (hash << 10);
328 hash ^= (hash >> 11);
329 hash += (hash << 15);
330 return hash % num_buckets;
333 void hash_table_init(struct pool* pool, struct hash_table* ht, unsigned num_buckets)
336 ht->num_buckets = num_buckets;
341 void hash_table_destroy(struct hash_table* ht)
343 #if defined(USE_STATS)
346 unsigned min = 0xffffffff, max = 0, sq = 0;
347 struct hash_table_elt* elt;
348 double mean, variance;
350 for (i = 0; i < ht->num_buckets; i++)
352 for (len = 0, elt = ht->buckets[i]; elt; elt = elt->next) len++;
353 if (len < min) min = len;
354 if (len > max) max = len;
357 mean = (double)ht->num_elts / ht->num_buckets;
358 variance = (double)sq / ht->num_buckets - mean * mean;
359 FIXME("STATS: elts[num:%-4u size:%u mean:%f] buckets[min:%-4u variance:%+f max:%-4u]\n",
360 ht->num_elts, ht->num_buckets, mean, min, variance, max);
362 for (i = 0; i < ht->num_buckets; i++)
364 for (len = 0, elt = ht->buckets[i]; elt; elt = elt->next) len++;
367 FIXME("Longuest bucket:\n");
368 for (elt = ht->buckets[i]; elt; elt = elt->next)
369 FIXME("\t%s\n", elt->name);
378 void hash_table_add(struct hash_table* ht, struct hash_table_elt* elt)
380 unsigned hash = hash_table_hash(elt->name, ht->num_buckets);
384 ht->buckets = pool_alloc(ht->pool, ht->num_buckets * sizeof(struct hash_table_bucket));
386 memset(ht->buckets, 0, ht->num_buckets * sizeof(struct hash_table_bucket));
389 /* in some cases, we need to get back the symbols of same name in the order
390 * in which they've been inserted. So insert new elements at the end of the list.
392 if (!ht->buckets[hash].first)
394 ht->buckets[hash].first = elt;
398 ht->buckets[hash].last->next = elt;
400 ht->buckets[hash].last = elt;
405 void hash_table_iter_init(const struct hash_table* ht,
406 struct hash_table_iter* hti, const char* name)
411 hti->last = hash_table_hash(name, ht->num_buckets);
412 hti->index = hti->last - 1;
416 hti->last = ht->num_buckets - 1;
422 void* hash_table_iter_up(struct hash_table_iter* hti)
424 if (!hti->ht->buckets) return NULL;
426 if (hti->element) hti->element = hti->element->next;
427 while (!hti->element && hti->index < hti->last)
428 hti->element = hti->ht->buckets[++hti->index].first;