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_String_ent cos_string_ent_composition = { {COS_OBJECT_PREFIX_OBJECT,
57 COS_Object_Type_String,
61 COS_Symbol_ent cos_symbol_ent_composition = { {COS_OBJECT_PREFIX_OBJECT,
62 COS_Object_Type_Symbol,
64 &cos_string_ent_composition,
67 COS_Symbol cos_Qcomposition = &cos_symbol_ent_composition;
70 COS_Symbol_Table cos_default_symbol_table = NULL;
74 cos_make_symbol (COS_String string)
76 COS_Symbol obj = COS_ALLOCATE_OBJECT (Symbol);
83 cos_retain_object (string);
88 cos_retain_symbol (COS_Object obj)
90 //cos_retain_object (((COS_Symbol)obj)->value);
91 //cos_retain_object (((COS_Symbol)obj)->name);
96 cos_release_symbol (COS_Object obj)
101 if ( (obj == cos_Qnil) || (obj == cos_Qt) )
104 if ( ((COS_Symbol)obj)->value != NULL)
105 cos_release_object (((COS_Symbol)obj)->value);
107 cos_release_object (((COS_Symbol)obj)->name);
113 cos_symbol_p (COS_object obj)
115 return COS_OBJECT_SYMBOL_P (obj);
119 cos_symbol_table_intern (COS_Symbol_Table table, COS_object name)
122 COS_String key_string;
123 unsigned long i, index;
129 if (COS_OBJECT_C_STRING_P (name))
131 key_string = cos_build_string ((char*)name);
135 key_string = (COS_String)name;
137 key = key_string->data;
138 index = cos_symbol_hash_string (key_string) % table->size;
139 for (i = index; i < table->size; i++)
141 entry = table->data[i];
144 entry = cos_make_symbol (key_string);
145 cos_retain_object ((COS_object)entry);
146 table->data[i] = entry;
149 else if ( COS_OBJECT_SYMBOL_P (entry)
150 && COS_OBJECT_STRING_P (entry->name)
151 && (entry->name->size == key_string->size)
152 && (memcmp (entry->name->data,
153 key_string->data, key_string->size) == 0) )
155 cos_retain_object ((COS_object)entry);
159 if (cos_symbol_table_grow (table) == 0)
160 return cos_symbol_table_intern (table, key_string);
165 cos_symbol_name (COS_Symbol symbol)
171 COS_Symbol_Table cos_make_symbol_table_0 (size_t size);
172 void cos_destroy_symbol_table_0 (COS_Symbol_Table hash);
175 /* derived from hashpjw, Dragon Book P436. */
177 cos_hash_c_string_n (const unsigned char *ptr, size_t size)
179 unsigned long hash = 0;
182 for ( i = 0; i < size; i++ )
185 hash = (hash << 4) + ptr[i];
186 g = hash & 0xf0000000;
188 hash = (hash ^ (g >> 24)) ^ g;
190 return hash & 07777777777;
194 cos_symbol_hash_string (COS_String string)
196 return cos_hash_c_string_n (string->data, string->size);
201 cos_make_symbol_table_0 (size_t size)
203 COS_Symbol_Table hash
204 = (COS_Symbol_Table)malloc (sizeof (COS_Symbol_Table_ent));
210 = (COS_Symbol*) malloc (sizeof (COS_Symbol) * size);
211 if (hash->data == NULL)
218 memset (hash->data, 0, sizeof (COS_Symbol) * size);
223 cos_destroy_symbol_table_0 (COS_Symbol_Table table)
233 cos_make_symbol_table ()
235 return cos_make_symbol_table_0 (2 /* 256 */);
239 cos_destroy_symbol_table (COS_Symbol_Table table)
243 for (i = 0; i < table->size; i++)
245 COS_Symbol entry = table->data[i];
249 if (entry->name != NULL)
250 cos_release_object (entry->name);
251 if (entry->value != NULL)
252 cos_release_object (entry->value);
256 cos_destroy_symbol_table_0 (table);
260 cos_intern (COS_object name)
262 if (cos_default_symbol_table == NULL)
264 cos_default_symbol_table = cos_make_symbol_table();
265 cos_symbol_table_set (cos_default_symbol_table, cos_Qnil);
266 cos_symbol_table_set (cos_default_symbol_table, cos_Qt);
267 cos_symbol_table_set (cos_default_symbol_table, cos_Qcomposition);
269 return cos_symbol_table_intern (cos_default_symbol_table, name);
273 cos_symbol_table_set (COS_Symbol_Table table, COS_Symbol symbol)
281 index = cos_symbol_hash_string (symbol->name) % table->size;
282 for (i = index; i < table->size; i++)
284 entry = table->data[i];
288 cos_retain_object ((COS_object)entry);
289 table->data[i] = entry;
292 else if (entry == symbol)
297 if (cos_symbol_table_grow (table) == 0)
298 return cos_symbol_table_set (table, symbol);
303 cos_print_symbol_table (COS_Symbol_Table table)
309 table = cos_default_symbol_table;
311 printf ("#[symbol_table %lX\tsize = %d", table->size);
312 for (i = 0; i < table->size; i++)
314 entry = table->data[i];
315 printf ("\n\t%d : ", i);
316 cos_print_object (entry);
323 cos_symbol_table_grow (COS_Symbol_Table table)
325 COS_Symbol_Table new_table
326 = cos_make_symbol_table_0 ( table->size * 2
327 /* - (table->size * 4 / 5) */ );
330 if (new_table == NULL)
333 //printf ("\n(old table is ");
334 //cos_print_symbol_table (table);
335 for (i = 0; i < table->size; i++)
337 COS_Symbol entry = table->data[i];
341 int status = cos_symbol_table_set (new_table, entry);
345 cos_destroy_symbol_table_0 (new_table);
351 table->size = new_table->size;
352 table->data = new_table->data;
354 //printf ("\t)\n(new table is ");
355 //cos_print_symbol_table (table);