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 static int isl_id_has_name(const void *entry, const void *val)
  70 {
  71         isl_id *id = (isl_id *)entry;
  72         const char *s = (const char *)val;
  73
  74         return !strcmp(id->name, s);
  75 }
  76
  77 __isl_give isl_id *isl_id_alloc(isl_ctx *ctx, const char *name, void *user)
  78 {
  79         struct isl_hash_table_entry *entry;
  80         uint32_t id_hash;
  81
  82         id_hash = isl_hash_init();
  83         if (name)
  84                 id_hash = isl_hash_string(id_hash, name);
  85         else
  86                 id_hash = isl_hash_builtin(id_hash, user);
  87         entry = isl_hash_table_find(ctx, &ctx->id_table, id_hash,
  88                                         isl_id_has_name, name, 1);
  89         if (!entry)
  90                 return NULL;
  91         if (entry->data)
  92                 return isl_id_copy(entry->data);
  93         entry->data = id_alloc(ctx, name, user);
  94         if (!entry->data)
  95                 ctx->id_table.n--;
  96         return entry->data;
  97 }
  98
  99 /* If the id has a negative refcount, then it is a static isl_id
 100  * which should not be changed.
 101  */
 102 __isl_give isl_id *isl_id_copy(isl_id *id)
 103 {
 104         if (!id)
 105                 return NULL;
 106
 107         if (id->ref < 0)
 108                 return id;
 109
 110         id->ref++;
 111         return id;
 112 }
 113
 114 static int isl_id_eq(const void *entry, const void *name)
 115 {
 116         return entry == name;
 117 }
 118
 119 uint32_t isl_hash_id(uint32_t hash, __isl_keep isl_id *id)
 120 {
 121         if (id)
 122                 isl_hash_hash(hash, id->hash);
 123
 124         return hash;
 125 }
 126
 127 /* If the id has a negative refcount, then it is a static isl_id
 128  * and should not be freed.
 129  */
 130 void *isl_id_free(__isl_take isl_id *id)
 131 {
 132         struct isl_hash_table_entry *entry;
 133
 134         if (!id)
 135                 return NULL;
 136
 137         if (id->ref < 0)
 138                 return NULL;
 139
 140         if (--id->ref > 0)
 141                 return NULL;
 142
 143         entry = isl_hash_table_find(id->ctx, &id->ctx->id_table, id->hash,
 144                                         isl_id_eq, id, 0);
 145         if (!entry)
 146                 isl_die(id->ctx, isl_error_unknown,
 147                         "unable to find id", (void)0);
 148         else
 149                 isl_hash_table_remove(id->ctx, &id->ctx->id_table, entry);
 150
 151         free((char *)id->name);
 152         isl_ctx_deref(id->ctx);
 153         free(id);
 154
 155         return NULL;
 156 }
 157
 158 __isl_give isl_printer *isl_printer_print_id(__isl_take isl_printer *p,
 159         __isl_keep isl_id *id)
 160 {
 161         if (!id)
 162                 goto error;
 163
 164         if (id->name)
 165                 p = isl_printer_print_str(p, id->name);
 166         if (id->user) {
 167                 char buffer[50];
 168                 snprintf(buffer, sizeof(buffer), "@%p", id->user);
 169                 p = isl_printer_print_str(p, buffer);
 170         }
 171         return p;
 172 error:
 173         isl_printer_free(p);
 174         return NULL;
 175 }