isl_id.c

   1 /*
   2  * Copyright 2008-2009 Katholieke Universiteit Leuven
   3  *
   4  * Use of this software is governed by the MIT license
   5  *
   6  * Written by Sven Verdoolaege, K.U.Leuven, Departement
   7  * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
   8  */
   9
  10 #include <string.h>
  11 #include <isl_ctx_private.h>
  12 #include <isl_id_private.h>
  13
  14 #undef BASE
  15 #define BASE id
  16
  17 #include <isl_list_templ.c>
  18
  19 /* A special, static isl_id to use as domains (and ranges)
  20  * of sets and parameters domains.
  21  * The user should never get a hold on this isl_id.
  22  */
  23 isl_id isl_id_none = {
  24         .ref = -1,
  25         .ctx = NULL,
  26         .name = "#none",
  27         .user = NULL
  28 };
  29
  30 isl_ctx *isl_id_get_ctx(__isl_keep isl_id *id)
  31 {
  32         return id ? id->ctx : NULL;
  33 }
  34
  35 void *isl_id_get_user(__isl_keep isl_id *id)
  36 {
  37         return id ? id->user : NULL;
  38 }
  39
  40 const char *isl_id_get_name(__isl_keep isl_id *id)
  41 {
  42         return id ? id->name : NULL;
  43 }
  44
  45 static __isl_give isl_id *id_alloc(isl_ctx *ctx, const char *name, void *user)
  46 {
  47         const char *copy = name ? strdup(name) : NULL;
  48         isl_id *id;
  49
  50         if (name && !copy)
  51                 return NULL;
  52         id = isl_calloc_type(ctx, struct isl_id);
  53         if (!id)
  54                 goto error;
  55
  56         id->ctx = ctx;
  57         isl_ctx_ref(id->ctx);
  58         id->ref = 1;
  59         id->name = copy;
  60         id->user = user;
  61
  62         id->hash = isl_hash_init();
  63         if (name)
  64                 id->hash = isl_hash_string(id->hash, name);
  65         else
  66                 id->hash = isl_hash_builtin(id->hash, user);
  67
  68         return id;
  69 error:
  70         free((char *)copy);
  71         return NULL;
  72 }
  73
  74 uint32_t isl_id_get_hash(__isl_keep isl_id *id)
  75 {
  76         return id ? id->hash : 0;
  77 }
  78
  79 struct isl_name_and_user {
  80         const char *name;
  81         void *user;
  82 };
  83
  84 static int isl_id_has_name_and_user(const void *entry, const void *val)
  85 {
  86         isl_id *id = (isl_id *)entry;
  87         struct isl_name_and_user *nu = (struct isl_name_and_user *) val;
  88
  89         if (id->user != nu->user)
  90                 return 0;
  91         if (!id->name && !nu->name)
  92                 return 1;
  93
  94         return !strcmp(id->name, nu->name);
  95 }
  96
  97 __isl_give isl_id *isl_id_alloc(isl_ctx *ctx, const char *name, void *user)
  98 {
  99         struct isl_hash_table_entry *entry;
 100         uint32_t id_hash;
 101         struct isl_name_and_user nu = { name, user };
 102
 103         if (!ctx)
 104                 return NULL;
 105
 106         id_hash = isl_hash_init();
 107         if (name)
 108                 id_hash = isl_hash_string(id_hash, name);
 109         else
 110                 id_hash = isl_hash_builtin(id_hash, user);
 111         entry = isl_hash_table_find(ctx, &ctx->id_table, id_hash,
 112                                         isl_id_has_name_and_user, &nu, 1);
 113         if (!entry)
 114                 return NULL;
 115         if (entry->data)
 116                 return isl_id_copy(entry->data);
 117         entry->data = id_alloc(ctx, name, user);
 118         if (!entry->data)
 119                 ctx->id_table.n--;
 120         return entry->data;
 121 }
 122
 123 /* If the id has a negative refcount, then it is a static isl_id
 124  * which should not be changed.
 125  */
 126 __isl_give isl_id *isl_id_copy(isl_id *id)
 127 {
 128         if (!id)
 129                 return NULL;
 130
 131         if (id->ref < 0)
 132                 return id;
 133
 134         id->ref++;
 135         return id;
 136 }
 137
 138 /* Compare two isl_ids.
 139  *
 140  * The order is fairly arbitrary.  We do keep the comparison of
 141  * the user pointers as a last resort since these pointer values
 142  * may not be stable across different systems or even different runs.
 143  */
 144 int isl_id_cmp(__isl_keep isl_id *id1, __isl_keep isl_id *id2)
 145 {
 146         if (id1 == id2)
 147                 return 0;
 148         if (!id1)
 149                 return -1;
 150         if (!id2)
 151                 return 1;
 152         if (!id1->name != !id2->name)
 153                 return !id1->name - !id2->name;
 154         if (id1->name) {
 155                 int cmp = strcmp(id1->name, id2->name);
 156                 if (cmp != 0)
 157                         return cmp;
 158         }
 159         if (id1->user < id2->user)
 160                 return -1;
 161         else
 162                 return 1;
 163 }
 164
 165 static int isl_id_eq(const void *entry, const void *name)
 166 {
 167         return entry == name;
 168 }
 169
 170 uint32_t isl_hash_id(uint32_t hash, __isl_keep isl_id *id)
 171 {
 172         if (id)
 173                 isl_hash_hash(hash, id->hash);
 174
 175         return hash;
 176 }
 177
 178 /* Replace the free_user callback by "free_user".
 179  */
 180 __isl_give isl_id *isl_id_set_free_user(__isl_take isl_id *id,
 181         __isl_give void (*free_user)(void *user))
 182 {
 183         if (!id)
 184                 return NULL;
 185
 186         id->free_user = free_user;
 187
 188         return id;
 189 }
 190
 191 /* If the id has a negative refcount, then it is a static isl_id
 192  * and should not be freed.
 193  */
 194 __isl_null isl_id *isl_id_free(__isl_take isl_id *id)
 195 {
 196         struct isl_hash_table_entry *entry;
 197
 198         if (!id)
 199                 return NULL;
 200
 201         if (id->ref < 0)
 202                 return NULL;
 203
 204         if (--id->ref > 0)
 205                 return NULL;
 206
 207         entry = isl_hash_table_find(id->ctx, &id->ctx->id_table, id->hash,
 208                                         isl_id_eq, id, 0);
 209         if (!entry)
 210                 isl_die(id->ctx, isl_error_unknown,
 211                         "unable to find id", (void)0);
 212         else
 213                 isl_hash_table_remove(id->ctx, &id->ctx->id_table, entry);
 214
 215         if (id->free_user)
 216                 id->free_user(id->user);
 217
 218         free((char *)id->name);
 219         isl_ctx_deref(id->ctx);
 220         free(id);
 221
 222         return NULL;
 223 }
 224
 225 __isl_give isl_printer *isl_printer_print_id(__isl_take isl_printer *p,
 226         __isl_keep isl_id *id)
 227 {
 228         if (!id)
 229                 goto error;
 230
 231         if (id->name)
 232                 p = isl_printer_print_str(p, id->name);
 233         if (id->user) {
 234                 char buffer[50];
 235                 snprintf(buffer, sizeof(buffer), "@%p", id->user);
 236                 p = isl_printer_print_str(p, buffer);
 237         }
 238         return p;
 239 error:
 240         isl_printer_free(p);
 241         return NULL;
 242 }