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);
69 cos_retain_object (string);
74 cos_retain_symbol (COS_Object obj)
76 cos_retain_object (((COS_Symbol)obj)->value);
77 cos_retain_object (((COS_Symbol)obj)->name);
82 cos_release_symbol (COS_Object obj)
87 if ( ((COS_Symbol)obj)->value != NULL)
88 cos_release_object (((COS_Symbol)obj)->value);
90 cos_release_object (((COS_Symbol)obj)->name);
96 cos_symbol_table_intern (COS_Symbol_Table table, COS_object name)
99 COS_String key_string;
100 unsigned long i, index;
106 if (COS_OBJECT_C_STRING_P (name))
108 key_string = cos_build_string ((char*)name);
112 key_string = (COS_String)name;
114 key = key_string->data;
115 index = cos_symbol_hash_string (key_string) % table->size;
116 for (i = index; i < table->size; i++)
118 entry = table->data[i];
121 entry = cos_make_symbol (key_string);
122 cos_retain_object ((COS_object)entry);
123 table->data[i] = entry;
126 else if ( (entry->name->size == key_string->size)
127 && (memcmp (entry->name->data,
128 key_string->data, key_string->size) == 0) )
133 if (cos_symbol_table_grow (table) == 0)
134 return cos_symbol_table_intern (table, key_string);
139 cos_symbol_name (COS_Symbol symbol)
145 COS_Symbol_Table cos_make_symbol_table_0 (size_t size);
146 void cos_destroy_symbol_table_0 (COS_Symbol_Table hash);
149 /* derived from hashpjw, Dragon Book P436. */
151 cos_hash_c_string_n (const unsigned char *ptr, size_t size)
153 unsigned long hash = 0;
156 for ( i = 0; i < size; i++ )
159 hash = (hash << 4) + ptr[i];
160 g = hash & 0xf0000000;
162 hash = (hash ^ (g >> 24)) ^ g;
164 return hash & 07777777777;
168 cos_symbol_hash_string (COS_String string)
170 return cos_hash_c_string_n (string->data, string->size);
175 cos_make_symbol_table_0 (size_t size)
177 COS_Symbol_Table hash
178 = (COS_Symbol_Table)malloc (sizeof (COS_Symbol_Table_ent));
184 = (COS_Symbol*) malloc (sizeof (COS_Symbol) * size);
185 if (hash->data == NULL)
192 memset (hash->data, 0, sizeof (COS_Symbol) * size);
197 cos_destroy_symbol_table_0 (COS_Symbol_Table table)
207 cos_make_symbol_table ()
209 return cos_make_symbol_table_0 (2 /* 256 */);
213 cos_destroy_symbol_table (COS_Symbol_Table table)
217 for (i = 0; i < table->size; i++)
219 COS_Symbol entry = table->data[i];
223 if (entry->name != NULL)
224 cos_release_object (entry->name);
225 if (entry->value != NULL)
226 cos_release_object (entry->value);
230 cos_destroy_symbol_table_0 (table);
234 cos_intern (COS_object name)
236 if (cos_default_symbol_table == NULL)
238 cos_default_symbol_table = cos_make_symbol_table();
239 cos_symbol_table_set (cos_default_symbol_table, cos_Qnil);
240 cos_symbol_table_set (cos_default_symbol_table, cos_Qt);
242 return cos_symbol_table_intern (cos_default_symbol_table, name);
246 cos_symbol_table_set (COS_Symbol_Table table, COS_Symbol symbol)
254 index = cos_symbol_hash_string (symbol->name) % table->size;
255 for (i = index; i < table->size; i++)
257 entry = table->data[i];
261 cos_retain_object ((COS_object)entry);
262 table->data[i] = entry;
265 else if (entry == symbol)
270 if (cos_symbol_table_grow (table) == 0)
271 return cos_symbol_table_set (table, symbol);
276 cos_symbol_table_grow (COS_Symbol_Table table)
278 COS_Symbol_Table new_table
279 = cos_make_symbol_table_0 ( table->size * 2
280 /* - (table->size * 4 / 5) */ );
283 if (new_table == NULL)
286 for (i = 0; i < table->size; i++)
288 COS_Symbol entry = table->data[i];
292 int status = cos_symbol_table_set (new_table, entry);
296 cos_destroy_symbol_table_0 (new_table);
302 table->size = new_table->size;
303 table->data = new_table->data;