1 /* Copyright (C) 2003,2004,2005,2006,2013 MORIOKA Tomohiko
2 This file is part of the CONCORD Library.
4 The CONCORD Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The CONCORD Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the CONCORD Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
23 unsigned long concord_hash_c_string (const unsigned char *ptr);
24 unsigned long cos_hash_c_string_n (const unsigned char *ptr, size_t size);
25 unsigned long cos_symbol_hash_string (COS_String string);
28 COS_String_ent cos_string_ent_nil = { {COS_OBJECT_PREFIX_OBJECT,
29 COS_Object_Type_String,
33 COS_Symbol_ent cos_symbol_ent_nil = { {COS_OBJECT_PREFIX_OBJECT,
34 COS_Object_Type_Symbol,
39 COS_Symbol cos_Qnil = &cos_symbol_ent_nil;
42 COS_String_ent cos_string_ent_t = { {COS_OBJECT_PREFIX_OBJECT,
43 COS_Object_Type_String,
47 COS_Symbol_ent cos_symbol_ent_t = { {COS_OBJECT_PREFIX_OBJECT,
48 COS_Object_Type_Symbol,
53 COS_Symbol cos_Qt = &cos_symbol_ent_t;
56 COS_Symbol_Table cos_default_symbol_table = NULL;
60 cos_make_symbol (COS_String string)
62 COS_Symbol obj = COS_ALLOCATE_OBJECT (Symbol);
73 cos_release_symbol (COS_Object obj)
78 if ( ((COS_Symbol)obj)->value != NULL)
79 cos_release_object (((COS_Symbol)obj)->value);
81 cos_release_object (((COS_Symbol)obj)->name);
87 cos_symbol_table_intern (COS_Symbol_Table table, COS_object name)
90 COS_String key_string;
91 unsigned long i, index;
97 if (COS_OBJECT_C_STRING_P (name))
99 key_string = cos_build_string ((char*)name);
103 key_string = (COS_String)name;
105 key = key_string->data;
106 index = cos_symbol_hash_string (key_string) % table->size;
107 for (i = index; i < table->size; i++)
109 entry = table->data[i];
112 entry = cos_make_symbol (key_string);
113 cos_retain_object ((COS_object)entry);
114 table->data[i] = entry;
117 else if ( (entry->name->size == key_string->size)
118 && (memcmp (entry->name->data,
119 key_string->data, key_string->size) == 0) )
124 if (cos_symbol_table_grow (table) == 0)
125 return cos_symbol_table_intern (table, key_string);
130 cos_symbol_name (COS_Symbol symbol)
136 COS_Symbol_Table cos_make_symbol_table_0 (size_t size);
137 void cos_destroy_symbol_table_0 (COS_Symbol_Table hash);
140 /* derived from hashpjw, Dragon Book P436. */
142 cos_hash_c_string_n (const unsigned char *ptr, size_t size)
144 unsigned long hash = 0;
147 for ( i = 0; i < size; i++ )
150 hash = (hash << 4) + ptr[i];
151 g = hash & 0xf0000000;
153 hash = (hash ^ (g >> 24)) ^ g;
155 return hash & 07777777777;
159 cos_symbol_hash_string (COS_String string)
161 return cos_hash_c_string_n (string->data, string->size);
166 cos_make_symbol_table_0 (size_t size)
168 COS_Symbol_Table hash
169 = (COS_Symbol_Table)malloc (sizeof (COS_Symbol_Table_ent));
175 = (COS_Symbol*) malloc (sizeof (COS_Symbol) * size);
176 if (hash->data == NULL)
183 memset (hash->data, 0, sizeof (COS_Symbol) * size);
188 cos_destroy_symbol_table_0 (COS_Symbol_Table table)
198 cos_make_symbol_table ()
200 return cos_make_symbol_table_0 (2 /* 256 */);
204 cos_destroy_symbol_table (COS_Symbol_Table table)
208 for (i = 0; i < table->size; i++)
210 COS_Symbol entry = table->data[i];
214 if (entry->name != NULL)
215 cos_release_object (entry->name);
216 if (entry->value != NULL)
217 cos_release_object (entry->value);
221 cos_destroy_symbol_table_0 (table);
225 cos_intern (COS_object name)
227 if (cos_default_symbol_table == NULL)
229 cos_default_symbol_table = cos_make_symbol_table();
230 cos_symbol_table_set (cos_default_symbol_table, cos_Qnil);
231 cos_symbol_table_set (cos_default_symbol_table, cos_Qt);
233 return cos_symbol_table_intern (cos_default_symbol_table, name);
237 cos_symbol_table_set (COS_Symbol_Table table, COS_Symbol symbol)
245 index = cos_symbol_hash_string (symbol->name) % table->size;
246 for (i = index; i < table->size; i++)
248 entry = table->data[i];
252 cos_retain_object ((COS_object)entry);
253 table->data[i] = entry;
256 else if (entry == symbol)
261 if (cos_symbol_table_grow (table) == 0)
262 return cos_symbol_table_set (table, symbol);
267 cos_symbol_table_grow (COS_Symbol_Table table)
269 COS_Symbol_Table new_table
270 = cos_make_symbol_table_0 ( table->size * 2
271 /* - (table->size * 4 / 5) */ );
274 if (new_table == NULL)
277 for (i = 0; i < table->size; i++)
279 COS_Symbol entry = table->data[i];
283 int status = cos_symbol_table_set (new_table, entry);
287 cos_destroy_symbol_table_0 (new_table);
293 table->size = new_table->size;
294 table->data = new_table->data;