2 * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
6 * This file may be distributed and/or modified under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation and appearing in the file LICENSE.GPL included in the
9 * packaging of this file.
11 * Licensees holding valid libFirm Professional Edition licenses may use
12 * this file in accordance with the libFirm Commercial License.
13 * Agreement provided with the Software.
15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * @brief Hash table to store names.
23 * @author Goetz Lindenmaier
39 /* for debugging only, not the real implementation */
41 char reserved[sizeof(unsigned) + sizeof(size_t)];
45 /** The current ident module implementation. */
46 static ident_if_t impl;
49 * Stores a string in the ident module and returns a handle for the string.
51 * @param handle the handle for the set
52 * @param str the string which shall be stored
53 * @param len length of str in bytes
55 * @return id - a handle for the generated ident
57 * Default implementation using libfirm sets.
59 static ident *set_new_id_from_chars(void *handle, const char *str, int len)
63 /* GL: Who added this assert? And why? */
65 return (ident *)set_hinsert0(id_set, str, len, ID_HASH(unsigned char, str, len));
69 * Stores a string in the ident module and returns a handle for the string.
71 * @param handle the handle for the set
72 * @param str the string (or whatever) which shall be stored
74 * Default implementation using libfirm sets.
76 static ident *set_new_id_from_str(void *handle, const char *str)
79 return set_new_id_from_chars(handle, str, strlen(str));
83 * Returns a string represented by an ident.
85 * @param handle the handle for the set
88 * Default implementation using libfirm sets.
90 static const char *set_get_id_str(void *handle, ident *id)
92 struct set_entry *entry = (struct set_entry *)id;
95 return (const char *)entry->dptr;
99 * Returns the length of the string represented by an ident.
101 * @param handle the handle for the set
102 * @param id the ident
104 * Default implementation using libfirm sets.
106 static int set_get_id_strlen(void *handle, ident *id)
108 struct set_entry *entry = (struct set_entry *)id;
115 * Default implementation using libfirm sets.
117 void set_finish_ident(void *handle) {
118 set *id_set = handle;
124 * Default implementation if no new_id_from_str() is provided.
126 static ident *def_new_id_from_str(void *handle, const char *str)
128 return impl.new_id_from_chars(handle, str, strlen(str));
132 * Default implementation if no get_id_strlen() is provided.
134 static int def_get_id_strlen(void *handle, ident *id)
136 return strlen(impl.get_id_str(handle, id));
139 /* Initialize the ident module. */
140 void init_ident(ident_if_t *id_if, int initial_n_idents)
143 memcpy(&impl, id_if, sizeof(impl));
145 if (! impl.new_id_from_str)
146 impl.new_id_from_str = def_new_id_from_str;
147 if (! impl.get_id_strlen)
148 impl.get_id_strlen = def_get_id_strlen;
150 impl.new_id_from_str = set_new_id_from_str;
151 impl.new_id_from_chars = set_new_id_from_chars;
152 impl.get_id_str = set_get_id_str;
153 impl.get_id_strlen = set_get_id_strlen;
154 impl.finish_ident = set_finish_ident;
156 /* it's ok to use memcmp here, we check only strings */
157 impl.handle = new_set(memcmp, initial_n_idents);
161 ident *new_id_from_str(const char *str)
164 return impl.new_id_from_str(impl.handle, str);
167 ident *new_id_from_chars(const char *str, int len)
170 return impl.new_id_from_chars(impl.handle, str, len);
173 const char *get_id_str(ident *id)
175 return impl.get_id_str(impl.handle, id);
178 int get_id_strlen(ident *id)
180 return impl.get_id_strlen(impl.handle, id);
183 void finish_ident(void) {
184 if (impl.finish_ident)
185 impl.finish_ident(impl.handle);
188 int id_is_prefix(ident *prefix, ident *id)
190 if (get_id_strlen(prefix) > get_id_strlen(id)) return 0;
191 return 0 == memcmp(get_id_str(prefix), get_id_str(id), get_id_strlen(prefix));
194 int id_is_suffix(ident *suffix, ident *id)
196 int suflen = get_id_strlen(suffix);
197 int idlen = get_id_strlen(id);
200 if (suflen > idlen) return 0;
202 part = get_id_str(id);
203 part = part + (idlen - suflen);
205 return 0 == memcmp(get_id_str(suffix), part, suflen);
208 int id_contains_char(ident *id, char c)
210 return strchr(get_id_str(id), c) != NULL;
213 ident *id_unique(const char *tag)
215 static unsigned unique_id = 0;
218 snprintf(buf, sizeof(buf), tag, unique_id);
220 return new_id_from_str(buf);