types/types.c

   1 /*
   2  * BabelTrace - Converter
   3  *
   4  * Types registry.
   5  *
   6  * Copyright (c) 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #include <ctf/ctf-types.h>
  24 #include <glib.h>
  25 #include <errno.h>
  26
  27 struct type_class {
  28         GQuark qname;
  29         void (*read)();
  30         size_t (*write)();
  31 };
  32
  33 struct type {
  34         struct type_class *class;
  35         size_t alignment;       /* type alignment, in bits */
  36         ssize_t len;            /* type length, in bits. -1 for dynamic size. */
  37 };
  38
  39 /*
  40  * Type class hash table contains the registered type classes. Type class
  41  * registration is typically performed by a plugin.
  42  * TODO: support plugin unload (unregistration of type classes).
  43  */
  44 GHashTable *type_classes;
  45
  46 struct type_class *ctf_lookup_type_class(GQuark qname)
  47 {
  48         return g_hash_table_lookup(type_classes,
  49                                    (gconstpointer) (unsigned long) qname)
  50 }
  51
  52 int ctf_register_type_class(const char *name,
  53                             void (*read)(),
  54                             void (*write)())
  55 {
  56         struct type_class tc = g_new(struct type_class, 1);
  57         GQuark qname = g_quark_from_string(name);
  58
  59         if (ctf_lookup_type_class(qname))
  60                 return -EEXIST;
  61
  62         g_hash_table_insert(type_classes,
  63                             (gconstpointer) (unsigned long) qname,
  64                             tc);
  65         return 0;
  66 }
  67
  68 int ctf_init_types(void)
  69 {
  70         type_classes = g_hash_table_new_full(g_direct_hash, g_direct_equal,
  71                                              NULL, g_free);
  72         if (!type_classes)
  73                 return -ENOMEM;
  74         return 0;
  75 }
  76
  77 int ctf_finalize_types(void)
  78 {
  79         g_hash_table_destroy(type_classes);
  80 }