isl_map.c: find_later_constraint_in_pair: stop search after near hit
[isl.git] / isl_id.c
blobd1f575e2461f4ea728797bb1d9d61fc5a098337c
1 /*
2 * Copyright 2008-2009 Katholieke Universiteit Leuven
4 * Use of this software is governed by the MIT license
6 * Written by Sven Verdoolaege, K.U.Leuven, Departement
7 * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
8 */
10 #include <string.h>
11 #include <isl_ctx_private.h>
12 #include <isl_id_private.h>
14 #undef EL_BASE
15 #define EL_BASE id
17 #include <isl_list_templ.c>
18 #include <isl_list_read_templ.c>
20 /* A special, static isl_id to use as domains (and ranges)
21 * of sets and parameters domains.
22 * The user should never get a hold on this isl_id.
24 isl_id isl_id_none = {
25 .ref = -1,
26 .ctx = NULL,
27 .name = "#none",
28 .user = NULL
31 isl_ctx *isl_id_get_ctx(__isl_keep isl_id *id)
33 return id ? id->ctx : NULL;
36 void *isl_id_get_user(__isl_keep isl_id *id)
38 return id ? id->user : NULL;
41 const char *isl_id_get_name(__isl_keep isl_id *id)
43 return id ? id->name : NULL;
46 static __isl_give isl_id *id_alloc(isl_ctx *ctx, const char *name, void *user)
48 const char *copy = name ? strdup(name) : NULL;
49 isl_id *id;
51 if (name && !copy)
52 return NULL;
53 id = isl_calloc_type(ctx, struct isl_id);
54 if (!id)
55 goto error;
57 id->ctx = ctx;
58 isl_ctx_ref(id->ctx);
59 id->ref = 1;
60 id->name = copy;
61 id->user = user;
63 id->hash = isl_hash_init();
64 if (name)
65 id->hash = isl_hash_string(id->hash, name);
66 else
67 id->hash = isl_hash_builtin(id->hash, user);
69 return id;
70 error:
71 free((char *)copy);
72 return NULL;
75 uint32_t isl_id_get_hash(__isl_keep isl_id *id)
77 return id ? id->hash : 0;
80 struct isl_name_and_user {
81 const char *name;
82 void *user;
85 static isl_bool isl_id_has_name_and_user(const void *entry, const void *val)
87 isl_id *id = (isl_id *)entry;
88 struct isl_name_and_user *nu = (struct isl_name_and_user *) val;
90 if (id->user != nu->user)
91 return isl_bool_false;
92 if (id->name == nu->name)
93 return isl_bool_true;
94 if (!id->name || !nu->name)
95 return isl_bool_false;
97 return isl_bool_ok(!strcmp(id->name, nu->name));
100 __isl_give isl_id *isl_id_alloc(isl_ctx *ctx, const char *name, void *user)
102 struct isl_hash_table_entry *entry;
103 uint32_t id_hash;
104 struct isl_name_and_user nu = { name, user };
106 if (!ctx)
107 return NULL;
109 id_hash = isl_hash_init();
110 if (name)
111 id_hash = isl_hash_string(id_hash, name);
112 else
113 id_hash = isl_hash_builtin(id_hash, user);
114 entry = isl_hash_table_find(ctx, &ctx->id_table, id_hash,
115 isl_id_has_name_and_user, &nu, 1);
116 if (!entry)
117 return NULL;
118 if (entry->data)
119 return isl_id_copy(entry->data);
120 entry->data = id_alloc(ctx, name, user);
121 if (!entry->data)
122 ctx->id_table.n--;
123 return entry->data;
126 /* If the id has a negative refcount, then it is a static isl_id
127 * which should not be changed.
129 __isl_give isl_id *isl_id_copy(isl_id *id)
131 if (!id)
132 return NULL;
134 if (id->ref < 0)
135 return id;
137 id->ref++;
138 return id;
141 /* Compare two isl_ids.
143 * The order is fairly arbitrary. We do keep the comparison of
144 * the user pointers as a last resort since these pointer values
145 * may not be stable across different systems or even different runs.
147 int isl_id_cmp(__isl_keep isl_id *id1, __isl_keep isl_id *id2)
149 if (id1 == id2)
150 return 0;
151 if (!id1)
152 return -1;
153 if (!id2)
154 return 1;
155 if (!id1->name != !id2->name)
156 return !id1->name - !id2->name;
157 if (id1->name) {
158 int cmp = strcmp(id1->name, id2->name);
159 if (cmp != 0)
160 return cmp;
162 if (id1->user < id2->user)
163 return -1;
164 else
165 return 1;
168 static isl_bool isl_id_eq(const void *entry, const void *name)
170 return isl_bool_ok(entry == name);
173 uint32_t isl_hash_id(uint32_t hash, __isl_keep isl_id *id)
175 if (id)
176 isl_hash_hash(hash, id->hash);
178 return hash;
181 /* Replace the free_user callback by "free_user".
183 __isl_give isl_id *isl_id_set_free_user(__isl_take isl_id *id,
184 void (*free_user)(void *user))
186 if (!id)
187 return NULL;
189 id->free_user = free_user;
191 return id;
194 /* Retrieve the callback set by isl_id_set_free_user,
195 * or NULL if no such callback was set.
197 void (*isl_id_get_free_user(__isl_keep isl_id *id))(void *user)
199 if (!id)
200 return NULL;
201 return id->free_user;
204 /* If the id has a negative refcount, then it is a static isl_id
205 * and should not be freed.
207 __isl_null isl_id *isl_id_free(__isl_take isl_id *id)
209 struct isl_hash_table_entry *entry;
211 if (!id)
212 return NULL;
214 if (id->ref < 0)
215 return NULL;
217 if (--id->ref > 0)
218 return NULL;
220 entry = isl_hash_table_find(id->ctx, &id->ctx->id_table, id->hash,
221 isl_id_eq, id, 0);
222 if (!entry)
223 return NULL;
224 if (entry == isl_hash_table_entry_none)
225 isl_die(id->ctx, isl_error_unknown,
226 "unable to find id", (void)0);
227 else
228 isl_hash_table_remove(id->ctx, &id->ctx->id_table, entry);
230 if (id->free_user)
231 id->free_user(id->user);
233 free((char *)id->name);
234 isl_ctx_deref(id->ctx);
235 free(id);
237 return NULL;
240 __isl_give isl_printer *isl_printer_print_id(__isl_take isl_printer *p,
241 __isl_keep isl_id *id)
243 if (!id)
244 goto error;
246 if (id->name)
247 p = isl_printer_print_str(p, id->name);
248 if (id->user) {
249 char buffer[50];
250 snprintf(buffer, sizeof(buffer), "@%p", id->user);
251 p = isl_printer_print_str(p, buffer);
253 return p;
254 error:
255 isl_printer_free(p);
256 return NULL;
259 /* Read an isl_id from "s" based on its name.
261 __isl_give isl_id *isl_stream_read_id(__isl_keep isl_stream *s)
263 struct isl_token *tok;
264 char *str;
265 isl_ctx *ctx;
266 isl_id *id;
268 if (!s)
269 return NULL;
270 tok = isl_stream_next_token(s);
271 if (!tok) {
272 isl_stream_error(s, NULL, "unexpected EOF");
273 return NULL;
275 ctx = isl_stream_get_ctx(s);
276 str = isl_token_get_str(ctx, tok);
277 isl_token_free(tok);
278 if (!str)
279 return NULL;
280 id = isl_id_alloc(ctx, str, NULL);
281 free(str);
283 return id;
286 #undef TYPE_BASE
287 #define TYPE_BASE id
288 #include "isl_read_from_str_templ.c"
290 /* Is "id1" (obviously) equal to "id2"?
292 * isl_id objects can be compared by pointer value, but
293 * isl_multi_*_plain_is_equal needs an isl_*_plain_is_equal.
295 static isl_bool isl_id_plain_is_equal(__isl_keep isl_id *id1,
296 __isl_keep isl_id *id2)
298 if (!id1 || !id2)
299 return isl_bool_error;
300 return id1 == id2;
303 #undef BASE
304 #define BASE id
306 #include <isl_multi_no_domain_templ.c>
307 #include <isl_multi_no_explicit_domain.c>
308 #include <isl_multi_templ.c>