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 ( (obj == cos_Qnil) || (obj == cos_Qt) )
90 if ( ((COS_Symbol)obj)->value != NULL)
91 cos_release_object (((COS_Symbol)obj)->value);
93 cos_release_object (((COS_Symbol)obj)->name);
99 cos_symbol_p (COS_object obj)
101 return COS_OBJECT_SYMBOL_P (obj);
105 cos_symbol_table_intern (COS_Symbol_Table table, COS_object name)
108 COS_String key_string;
109 unsigned long i, index;
115 if (COS_OBJECT_C_STRING_P (name))
117 key_string = cos_build_string ((char*)name);
121 key_string = (COS_String)name;
123 key = key_string->data;
124 index = cos_symbol_hash_string (key_string) % table->size;
125 for (i = index; i < table->size; i++)
127 entry = table->data[i];
130 entry = cos_make_symbol (key_string);
131 cos_retain_object ((COS_object)entry);
132 table->data[i] = entry;
135 else if ( COS_OBJECT_SYMBOL_P (entry)
136 && COS_OBJECT_STRING_P (entry->name)
137 && (entry->name->size == key_string->size)
138 && (memcmp (entry->name->data,
139 key_string->data, key_string->size) == 0) )
141 cos_retain_object ((COS_object)entry);
145 if (cos_symbol_table_grow (table) == 0)
146 return cos_symbol_table_intern (table, key_string);
151 cos_symbol_name (COS_Symbol symbol)
157 COS_Symbol_Table cos_make_symbol_table_0 (size_t size);
158 void cos_destroy_symbol_table_0 (COS_Symbol_Table hash);
161 /* derived from hashpjw, Dragon Book P436. */
163 cos_hash_c_string_n (const unsigned char *ptr, size_t size)
165 unsigned long hash = 0;
168 for ( i = 0; i < size; i++ )
171 hash = (hash << 4) + ptr[i];
172 g = hash & 0xf0000000;
174 hash = (hash ^ (g >> 24)) ^ g;
176 return hash & 07777777777;
180 cos_symbol_hash_string (COS_String string)
182 return cos_hash_c_string_n (string->data, string->size);
187 cos_make_symbol_table_0 (size_t size)
189 COS_Symbol_Table hash
190 = (COS_Symbol_Table)malloc (sizeof (COS_Symbol_Table_ent));
196 = (COS_Symbol*) malloc (sizeof (COS_Symbol) * size);
197 if (hash->data == NULL)
204 memset (hash->data, 0, sizeof (COS_Symbol) * size);
209 cos_destroy_symbol_table_0 (COS_Symbol_Table table)
219 cos_make_symbol_table ()
221 return cos_make_symbol_table_0 (2 /* 256 */);
225 cos_destroy_symbol_table (COS_Symbol_Table table)
229 for (i = 0; i < table->size; i++)
231 COS_Symbol entry = table->data[i];
235 if (entry->name != NULL)
236 cos_release_object (entry->name);
237 if (entry->value != NULL)
238 cos_release_object (entry->value);
242 cos_destroy_symbol_table_0 (table);
246 cos_intern (COS_object name)
248 if (cos_default_symbol_table == NULL)
250 cos_default_symbol_table = cos_make_symbol_table();
251 cos_symbol_table_set (cos_default_symbol_table, cos_Qnil);
252 cos_symbol_table_set (cos_default_symbol_table, cos_Qt);
254 return cos_symbol_table_intern (cos_default_symbol_table, name);
258 cos_symbol_table_set (COS_Symbol_Table table, COS_Symbol symbol)
266 index = cos_symbol_hash_string (symbol->name) % table->size;
267 for (i = index; i < table->size; i++)
269 entry = table->data[i];
273 cos_retain_object ((COS_object)entry);
274 table->data[i] = entry;
277 else if (entry == symbol)
282 if (cos_symbol_table_grow (table) == 0)
283 return cos_symbol_table_set (table, symbol);
288 cos_print_symbol_table (COS_Symbol_Table table)
294 table = cos_default_symbol_table;
296 printf ("#[symbol_table %lX\tsize = %d", table->size);
297 for (i = 0; i < table->size; i++)
299 entry = table->data[i];
300 printf ("\n\t%d : ", i);
301 cos_print_object (entry);
308 cos_symbol_table_grow (COS_Symbol_Table table)
310 COS_Symbol_Table new_table
311 = cos_make_symbol_table_0 ( table->size * 2
312 /* - (table->size * 4 / 5) */ );
315 if (new_table == NULL)
318 //printf ("\n(old table is ");
319 //cos_print_symbol_table (table);
320 for (i = 0; i < table->size; i++)
322 COS_Symbol entry = table->data[i];
326 int status = cos_symbol_table_set (new_table, entry);
330 cos_destroy_symbol_table_0 (new_table);
336 table->size = new_table->size;
337 table->data = new_table->data;
339 //printf ("\t)\n(new table is ");
340 //cos_print_symbol_table (table);