isl_name.c

   1 #include <string.h>
   2 #include "isl_name.h"
   3
   4 struct isl_name *isl_name_alloc(struct isl_ctx *ctx, const char *s)
   5 {
   6         const char *copy = strdup(s);
   7         struct isl_name *name;
   8
   9         if (!copy)
  10                 return NULL;
  11         name = isl_alloc_type(ctx, struct isl_name);
  12         if (!name)
  13                 return NULL;
  14
  15         name->ref = 1;
  16         name->name = copy;
  17
  18         return name;
  19 }
  20
  21 static int isl_name_has_name(const void *entry, const void *val)
  22 {
  23         struct isl_name *name = (struct isl_name *)entry;
  24         const char *s = (const char *)val;
  25
  26         return !strcmp(name->name, s);
  27 }
  28
  29 struct isl_name *isl_name_get(struct isl_ctx *ctx, const char *name)
  30 {
  31         struct isl_hash_table_entry *entry;
  32         uint32_t name_hash;
  33
  34         name_hash = isl_hash_string(isl_hash_init(), name);
  35         entry = isl_hash_table_find(ctx, &ctx->name_hash, name_hash,
  36                                         isl_name_has_name, name, 1);
  37         if (!entry)
  38                 return NULL;
  39         if (entry->data)
  40                 return isl_name_copy(ctx, entry->data);
  41         entry->data = isl_name_alloc(ctx, name);
  42         if (!entry->data)
  43                 ctx->name_hash.n--;
  44         return entry->data;
  45 }
  46
  47 struct isl_name *isl_name_copy(struct isl_ctx *ctx, struct isl_name *name)
  48 {
  49         if (!name)
  50                 return NULL;
  51
  52         name->ref++;
  53         return name;
  54 }
  55
  56 static int isl_name_eq(const void *entry, const void *name)
  57 {
  58         return entry == name;
  59 }
  60
  61 void isl_name_free(struct isl_ctx *ctx, struct isl_name *name)
  62 {
  63         uint32_t name_hash;
  64         struct isl_hash_table_entry *entry;
  65
  66         if (!name)
  67                 return;
  68
  69         if (--name->ref > 0)
  70                 return;
  71
  72         name_hash = isl_hash_string(isl_hash_init(), name->name);
  73         entry = isl_hash_table_find(ctx, &ctx->name_hash, name_hash,
  74                                         isl_name_eq, name, 0);
  75         isl_assert(ctx, entry, return);
  76         isl_hash_table_remove(ctx, &ctx->name_hash, entry);
  77
  78         free((char *)name->name);
  79         free(name);
  80 }