1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2011 AT&T Intellectual Property * 5 * and is licensed under the * 6 * Eclipse Public License, Version 1.0 * 7 * by AT&T Intellectual Property * 8 * * 9 * A copy of the License is available at * 10 * http://www.eclipse.org/org/documents/epl-v10.html * 11 * (with md5 checksum b35adb5213ca9657e911e9befb180842) * 12 * * 13 * Information and Software Systems Research * 14 * AT&T Research * 15 * Florham Park NJ * 16 * * 17 * Glenn Fowler <gsf@research.att.com> * 18 * David Korn <dgk@research.att.com> * 19 * Phong Vo <kpv@research.att.com> * 20 * * 21 ***********************************************************************/ 22 #pragma prototyped 23 /* 24 * Glenn Fowler 25 * AT&T Research 26 * 27 * hash table library 28 */ 29 30 #include "hashlib.h" 31 32 /* 33 * change table size and rehash 34 * size must be a power of 2 35 */ 36 37 void 38 hashsize(register Hash_table_t* tab, int size) 39 { 40 register Hash_bucket_t** old_s; 41 register Hash_bucket_t** new_s; 42 register Hash_bucket_t* old_b; 43 register Hash_bucket_t* new_b; 44 Hash_bucket_t** old_sx; 45 unsigned int index; 46 Hash_region_f region; 47 void* handle; 48 49 if (size > 0 && size != tab->size && !(size & (size - 1))) 50 { 51 if (region = tab->root->local->region) 52 { 53 handle = tab->root->local->handle; 54 new_s = (Hash_bucket_t**)(*region)(handle, NiL, sizeof(Hash_bucket_t*) * size, 0); 55 } 56 else new_s = newof(0, Hash_bucket_t*, size, 0); 57 if (!new_s) tab->flags |= HASH_FIXED; 58 else 59 { 60 old_sx = (old_s = tab->table) + tab->size; 61 tab->size = size; 62 while (old_s < old_sx) 63 { 64 old_b = *old_s++; 65 while (old_b) 66 { 67 new_b = old_b; 68 old_b = old_b->next; 69 index = new_b->hash; 70 HASHMOD(tab, index); 71 new_b->next = new_s[index]; 72 new_s[index] = new_b; 73 } 74 } 75 if ((tab->flags & (HASH_RESIZE|HASH_STATIC)) != HASH_STATIC) 76 { 77 if (region) (*region)(handle, tab->table, 0, 0); 78 else free(tab->table); 79 } 80 tab->table = new_s; 81 tab->flags |= HASH_RESIZE; 82 } 83 } 84 } 85