isl_id.c

   1 /*
   2  * Copyright 2008-2009 Katholieke Universiteit Leuven
   3  *
   4  * Use of this software is governed by the GNU LGPLv2.1 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 /* A special, static isl_id to use as domains (and ranges)
  15  * of sets and parameters domains.
  16  * The user should never get a hold on this isl_id.
  17  */
  18 isl_id isl_id_none = {
  19         .ref = -1,
  20         .ctx = NULL,
  21         .name = "#none",
  22         .user = NULL
  23 };
  24
  25 isl_ctx *isl_id_get_ctx(__isl_keep isl_id *id)
  26 {
  27         return id ? id->ctx : NULL;
  28 }
  29
  30 void *isl_id_get_user(__isl_keep isl_id *id)
  31 {
  32         return id ? id->user : NULL;
  33 }
  34
  35 const char *isl_id_get_name(__isl_keep isl_id *id)
  36 {
  37         return id ? id->name : NULL;
  38 }
  39
  40 static __isl_give isl_id *id_alloc(isl_ctx *ctx, const char *name, void *user)
  41 {
  42         const char *copy = name ? strdup(name) : NULL;
  43         isl_id *id;
  44
  45         if (name && !copy)
  46                 return NULL;
  47         id = isl_alloc_type(ctx, struct isl_id);
  48         if (!id)
  49                 goto error;
  50
  51         id->ctx = ctx;
  52         isl_ctx_ref(id->ctx);
  53         id->ref = 1;
  54         id->name = copy;
  55         id->user = user;
  56
  57         id->hash = isl_hash_init();
  58         if (name)
  59                 id->hash = isl_hash_string(id->hash, name);
  60         else
  61                 id->hash = isl_hash_builtin(id->hash, user);
  62
  63         return id;
  64 error:
  65         free((char *)copy);
  66         return NULL;
  67 }
  68
  69 struct isl_name_and_user {
  70         const char *name;
  71         void *user;
  72 };
  73
  74 static int isl_id_has_name_and_user(const void *entry, const void *val)
  75 {
  76         isl_id *id = (isl_id *)entry;
  77         struct isl_name_and_user *nu = (struct isl_name_and_user *) val;
  78
  79         if (id->user != nu->user)
  80                 return 0;
  81         if (!id->name && !nu->name)
  82                 return 1;
  83
  84         return !strcmp(id->name, nu->name);
  85 }
  86
  87 __isl_give isl_id *isl_id_alloc(isl_ctx *ctx, const char *name, void *user)
  88 {
  89         struct isl_hash_table_entry *entry;
  90         uint32_t id_hash;
  91         struct isl_name_and_user nu = { name, user };
  92
  93         id_hash = isl_hash_init();
  94         if (name)
  95                 id_hash = isl_hash_string(id_hash, name);
  96         else
  97                 id_hash = isl_hash_builtin(id_hash, user);
  98         entry = isl_hash_table_find(ctx, &ctx->id_table, id_hash,
  99                                         isl_id_has_name_and_user, &nu, 1);
 100         if (!entry)
 101                 return NULL;
 102         if (entry->data)
 103                 return isl_id_copy(entry->data);
 104         entry->data = id_alloc(ctx, name, user);
 105         if (!entry->data)
 106                 ctx->id_table.n--;
 107         return entry->data;
 108 }
 109
 110 /* If the id has a negative refcount, then it is a static isl_id
 111  * which should not be changed.
 112  */
 113 __isl_give isl_id *isl_id_copy(isl_id *id)
 114 {
 115         if (!id)
 116                 return NULL;
 117
 118         if (id->ref < 0)
 119                 return id;
 120
 121         id->ref++;
 122         return id;
 123 }
 124
 125 static int isl_id_eq(const void *entry, const void *name)
 126 {
 127         return entry == name;
 128 }
 129
 130 uint32_t isl_hash_id(uint32_t hash, __isl_keep isl_id *id)
 131 {
 132         if (id)
 133                 isl_hash_hash(hash, id->hash);
 134
 135         return hash;
 136 }
 137
 138 /* If the id has a negative refcount, then it is a static isl_id
 139  * and should not be freed.
 140  */
 141 void *isl_id_free(__isl_take isl_id *id)
 142 {
 143         struct isl_hash_table_entry *entry;
 144
 145         if (!id)
 146                 return NULL;
 147
 148         if (id->ref < 0)
 149                 return NULL;
 150
 151         if (--id->ref > 0)
 152                 return NULL;
 153
 154         entry = isl_hash_table_find(id->ctx, &id->ctx->id_table, id->hash,
 155                                         isl_id_eq, id, 0);
 156         if (!entry)
 157                 isl_die(id->ctx, isl_error_unknown,
 158                         "unable to find id", (void)0);
 159         else
 160                 isl_hash_table_remove(id->ctx, &id->ctx->id_table, entry);
 161
 162         free((char *)id->name);
 163         isl_ctx_deref(id->ctx);
 164         free(id);
 165
 166         return NULL;
 167 }
 168
 169 __isl_give isl_printer *isl_printer_print_id(__isl_take isl_printer *p,
 170         __isl_keep isl_id *id)
 171 {
 172         if (!id)
 173                 goto error;
 174
 175         if (id->name)
 176                 p = isl_printer_print_str(p, id->name);
 177         if (id->user) {
 178                 char buffer[50];
 179                 snprintf(buffer, sizeof(buffer), "@%p", id->user);
 180                 p = isl_printer_print_str(p, buffer);
 181         }
 182         return p;
 183 error:
 184         isl_printer_free(p);
 185         return NULL;
 186 }