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336 lines
9.2 KiB
C
336 lines
9.2 KiB
C
/*
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* Various storage structures (pool allocation, vector, hash table)
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*
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* Copyright (C) 1993, Eric Youngdale.
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* 2004, Eric Pouech
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "config.h"
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#include <assert.h>
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#include <stdlib.h>
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#include "wine/debug.h"
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#include "dbghelp_private.h"
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#ifdef USE_STATS
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#include <math.h>
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#endif
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WINE_DEFAULT_DEBUG_CHANNEL(dbghelp);
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struct pool_arena
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{
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struct pool_arena* next;
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char* current;
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};
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void pool_init(struct pool* a, unsigned arena_size)
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{
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a->arena_size = arena_size;
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a->first = NULL;
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}
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void pool_destroy(struct pool* pool)
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{
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struct pool_arena* arena;
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struct pool_arena* next;
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#ifdef USE_STATS
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unsigned alloc, used, num;
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for (alloc = used = num = 0, arena = pool->first; arena; arena = arena->next)
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{
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alloc += pool->arena_size;
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used += arena->current - (char*)arena;
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num++;
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}
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FIXME("STATS: pool %p has allocated %u kbytes, used %u kbytes in %u arenas,\n"
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"\t\t\t\tnon-allocation ratio: %.2f%%\n",
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pool, alloc >> 10, used >> 10, num, 100.0 - (float)used / (float)alloc * 100.0);
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#endif
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for (arena = pool->first; arena; arena = next)
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{
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next = arena->next;
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HeapFree(GetProcessHeap(), 0, arena);
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}
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pool_init(pool, 0);
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}
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void* pool_alloc(struct pool* pool, unsigned len)
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{
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struct pool_arena** parena;
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struct pool_arena* arena;
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void* ret;
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len = (len + 3) & ~3; /* round up size on DWORD boundary */
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assert(sizeof(struct pool_arena) + len <= pool->arena_size && len);
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for (parena = &pool->first; *parena; parena = &(*parena)->next)
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{
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if ((char*)(*parena) + pool->arena_size - (*parena)->current >= len)
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{
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ret = (*parena)->current;
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(*parena)->current += len;
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return ret;
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}
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}
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arena = HeapAlloc(GetProcessHeap(), 0, pool->arena_size);
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if (!arena) {FIXME("OOM\n");return NULL;}
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*parena = arena;
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ret = (char*)arena + sizeof(*arena);
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arena->next = NULL;
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arena->current = (char*)ret + len;
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return ret;
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}
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static struct pool_arena* pool_is_last(struct pool* pool, void* p, unsigned old_size)
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{
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struct pool_arena* arena;
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for (arena = pool->first; arena; arena = arena->next)
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{
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if (arena->current == (char*)p + old_size) return arena;
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}
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return NULL;
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}
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static void* pool_realloc(struct pool* pool, void* p, unsigned old_size, unsigned new_size)
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{
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struct pool_arena* arena;
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void* new;
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if ((arena = pool_is_last(pool, p, old_size)) &&
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(char*)p + new_size <= (char*)arena + pool->arena_size)
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{
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arena->current = (char*)p + new_size;
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return p;
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}
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if ((new = pool_alloc(pool, new_size)) && old_size)
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memcpy(new, p, min(old_size, new_size));
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return new;
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}
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char* pool_strdup(struct pool* pool, const char* str)
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{
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char* ret;
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if ((ret = pool_alloc(pool, strlen(str) + 1))) strcpy(ret, str);
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return ret;
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}
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void vector_init(struct vector* v, unsigned esz, unsigned bucket_sz)
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{
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v->buckets = NULL;
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/* align size on DWORD boundaries */
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v->elt_size = (esz + 3) & ~3;
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switch (bucket_sz)
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{
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case 2: v->shift = 1; break;
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case 4: v->shift = 2; break;
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case 8: v->shift = 3; break;
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case 16: v->shift = 4; break;
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case 32: v->shift = 5; break;
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case 64: v->shift = 6; break;
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case 128: v->shift = 7; break;
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case 256: v->shift = 8; break;
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case 512: v->shift = 9; break;
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case 1024: v->shift = 10; break;
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default: assert(0);
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}
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v->num_buckets = 0;
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v->num_elts = 0;
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}
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unsigned vector_length(const struct vector* v)
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{
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return v->num_elts;
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}
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void* vector_at(const struct vector* v, unsigned pos)
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{
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unsigned o;
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if (pos >= v->num_elts) return NULL;
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o = pos & ((1 << v->shift) - 1);
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return (char*)v->buckets[pos >> v->shift] + o * v->elt_size;
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}
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void* vector_add(struct vector* v, struct pool* pool)
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{
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unsigned ncurr = v->num_elts++;
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/* check that we don't wrap around */
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assert(v->num_elts > ncurr);
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if (ncurr == (v->num_buckets << v->shift))
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{
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v->buckets = pool_realloc(pool, v->buckets,
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v->num_buckets * sizeof(void*),
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(v->num_buckets + 1) * sizeof(void*));
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v->buckets[v->num_buckets] = pool_alloc(pool, v->elt_size << v->shift);
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return v->buckets[v->num_buckets++];
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}
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return vector_at(v, ncurr);
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}
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static unsigned vector_position(const struct vector* v, const void* elt)
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{
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int i;
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for (i = 0; i < v->num_buckets; i++)
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{
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if (v->buckets[i] <= elt &&
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(const char*)elt < (const char*)v->buckets[i] + (v->elt_size << v->shift))
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{
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return (i << v->shift) +
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((const char*)elt - (const char*)v->buckets[i]) / v->elt_size;
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}
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}
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assert(0);
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return 0;
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}
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void* vector_iter_up(const struct vector* v, void* elt)
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{
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unsigned pos;
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if (!elt) return vector_at(v, 0);
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pos = vector_position(v, elt) + 1;
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if (pos >= vector_length(v)) return NULL;
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return vector_at(v, pos);
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}
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void* vector_iter_down(const struct vector* v, void* elt)
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{
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unsigned pos;
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if (!elt) return vector_at(v, vector_length(v) - 1);
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pos = vector_position(v, elt);
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if (pos == 0) return NULL;
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return vector_at(v, pos - 1);
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}
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unsigned hash_table_hash(const char* name, unsigned num_buckets)
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{
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unsigned hash = 0;
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while (*name)
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{
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hash += *name++;
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hash += (hash << 10);
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hash ^= (hash >> 6);
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}
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hash += (hash << 3);
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hash ^= (hash >> 11);
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hash += (hash << 15);
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return hash % num_buckets;
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}
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void hash_table_init(struct pool* pool, struct hash_table* ht, unsigned num_buckets)
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{
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ht->buckets = pool_alloc(pool, num_buckets * sizeof(struct hash_table_elt*));
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assert(ht->buckets);
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ht->num_buckets = num_buckets;
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memset(ht->buckets, 0, num_buckets * sizeof(struct hash_table_elt*));
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}
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void hash_table_destroy(struct hash_table* ht)
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{
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#if defined(USE_STATS)
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int i;
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unsigned len;
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unsigned num = 0, min = 0xffffffff, max = 0, sq = 0;
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struct hash_table_elt* elt;
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double mean, variance;
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for (i = 0; i < ht->num_buckets; i++)
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{
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for (len = 0, elt = ht->buckets[i]; elt; elt = elt->next) len++;
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if (len < min) min = len;
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if (len > max) max = len;
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num += len;
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sq += len * len;
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}
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mean = (double)num / ht->num_buckets;
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variance = (double)sq / ht->num_buckets - mean * mean;
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FIXME("STATS: elts[num:%-4u size:%u mean:%f] buckets[min:%-4u variance:%+f max:%-4u]\n",
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num, ht->num_buckets, mean, min, variance, max);
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#if 1
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for (i = 0; i < ht->num_buckets; i++)
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{
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for (len = 0, elt = ht->buckets[i]; elt; elt = elt->next) len++;
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if (len == max)
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{
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FIXME("Longuest bucket:\n");
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for (elt = ht->buckets[i]; elt; elt = elt->next)
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FIXME("\t%s\n", elt->name);
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break;
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}
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}
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#endif
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#endif
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}
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void hash_table_add(struct hash_table* ht, struct hash_table_elt* elt)
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{
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unsigned hash = hash_table_hash(elt->name, ht->num_buckets);
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struct hash_table_elt** p;
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/* in some cases, we need to get back the symbols of same name in the order
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* in which they've been inserted. So insert new elements at the end of the list.
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*/
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for (p = &ht->buckets[hash]; *p; p = &((*p)->next));
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*p = elt;
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elt->next = NULL;
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}
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void* hash_table_find(const struct hash_table* ht, const char* name)
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{
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unsigned hash = hash_table_hash(name, ht->num_buckets);
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struct hash_table_elt* elt;
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for (elt = ht->buckets[hash]; elt; elt = elt->next)
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if (!strcmp(name, elt->name)) return elt;
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return NULL;
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}
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void hash_table_iter_init(const struct hash_table* ht,
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struct hash_table_iter* hti, const char* name)
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{
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hti->ht = ht;
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if (name)
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{
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hti->last = hash_table_hash(name, ht->num_buckets);
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hti->index = hti->last - 1;
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}
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else
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{
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hti->last = ht->num_buckets - 1;
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hti->index = -1;
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}
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hti->element = NULL;
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}
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void* hash_table_iter_up(struct hash_table_iter* hti)
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{
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if (hti->element) hti->element = hti->element->next;
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while (!hti->element && hti->index < hti->last)
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hti->element = hti->ht->buckets[++hti->index];
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return hti->element;
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}
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