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 isl_ctx *isl_id_get_ctx(__isl_keep isl_id *id)
  15 {
  16         return id ? id->ctx : NULL;
  17 }
  18
  19 void *isl_id_get_user(__isl_keep isl_id *id)
  20 {
  21         return id ? id->user : NULL;
  22 }
  23
  24 const char *isl_id_get_name(__isl_keep isl_id *id)
  25 {
  26         return id ? id->name : NULL;
  27 }
  28
  29 static __isl_give isl_id *id_alloc(isl_ctx *ctx, const char *name, void *user)
  30 {
  31         const char *copy = name ? strdup(name) : NULL;
  32         isl_id *id;
  33
  34         if (name && !copy)
  35                 return NULL;
  36         id = isl_alloc_type(ctx, struct isl_id);
  37         if (!id)
  38                 goto error;
  39
  40         id->ctx = ctx;
  41         isl_ctx_ref(id->ctx);
  42         id->ref = 1;
  43         id->name = copy;
  44         id->user = user;
  45
  46         id->hash = isl_hash_init();
  47         if (name)
  48                 id->hash = isl_hash_string(id->hash, name);
  49         else
  50                 id->hash = isl_hash_builtin(id->hash, user);
  51
  52         return id;
  53 error:
  54         free((char *)copy);
  55         return NULL;
  56 }
  57
  58 static int isl_id_has_name(const void *entry, const void *val)
  59 {
  60         isl_id *id = (isl_id *)entry;
  61         const char *s = (const char *)val;
  62
  63         return !strcmp(id->name, s);
  64 }
  65
  66 __isl_give isl_id *isl_id_alloc(isl_ctx *ctx, const char *name, void *user)
  67 {
  68         struct isl_hash_table_entry *entry;
  69         uint32_t id_hash;
  70
  71         id_hash = isl_hash_init();
  72         if (name)
  73                 id_hash = isl_hash_string(id_hash, name);
  74         else
  75                 id_hash = isl_hash_builtin(id_hash, user);
  76         entry = isl_hash_table_find(ctx, &ctx->id_table, id_hash,
  77                                         isl_id_has_name, name, 1);
  78         if (!entry)
  79                 return NULL;
  80         if (entry->data)
  81                 return isl_id_copy(entry->data);
  82         entry->data = id_alloc(ctx, name, user);
  83         if (!entry->data)
  84                 ctx->id_table.n--;
  85         return entry->data;
  86 }
  87
  88 /* If the id has a negative refcount, then it is a static isl_id
  89  * which should not be changed.
  90  */
  91 __isl_give isl_id *isl_id_copy(isl_id *id)
  92 {
  93         if (!id)
  94                 return NULL;
  95
  96         if (id->ref < 0)
  97                 return id;
  98
  99         id->ref++;
 100         return id;
 101 }
 102
 103 static int isl_id_eq(const void *entry, const void *name)
 104 {
 105         return entry == name;
 106 }
 107
 108 uint32_t isl_hash_id(uint32_t hash, __isl_keep isl_id *id)
 109 {
 110         if (id)
 111                 isl_hash_hash(hash, id->hash);
 112
 113         return hash;
 114 }
 115
 116 /* If the id has a negative refcount, then it is a static isl_id
 117  * and should not be freed.
 118  */
 119 void *isl_id_free(__isl_take isl_id *id)
 120 {
 121         struct isl_hash_table_entry *entry;
 122
 123         if (!id)
 124                 return NULL;
 125
 126         if (id->ref < 0)
 127                 return NULL;
 128
 129         if (--id->ref > 0)
 130                 return NULL;
 131
 132         entry = isl_hash_table_find(id->ctx, &id->ctx->id_table, id->hash,
 133                                         isl_id_eq, id, 0);
 134         if (!entry)
 135                 isl_die(id->ctx, isl_error_unknown,
 136                         "unable to find id", (void)0);
 137         else
 138                 isl_hash_table_remove(id->ctx, &id->ctx->id_table, entry);
 139
 140         free((char *)id->name);
 141         isl_ctx_deref(id->ctx);
 142         free(id);
 143
 144         return NULL;
 145 }
 146
 147 __isl_give isl_printer *isl_printer_print_id(__isl_take isl_printer *p,
 148         __isl_keep isl_id *id)
 149 {
 150         if (!id)
 151                 goto error;
 152
 153         if (id->name)
 154                 p = isl_printer_print_str(p, id->name);
 155         if (id->user) {
 156                 char buffer[50];
 157                 snprintf(buffer, sizeof(buffer), "@%p", id->user);
 158                 p = isl_printer_print_str(p, buffer);
 159         }
 160         return p;
 161 error:
 162         isl_printer_free(p);
 163         return NULL;
 164 }