type classes: hash table

[babeltrace.git] / lib / types / types.c

diff --git a/lib/types/types.c b/lib/types/types.c
index 1b9a3dfb5956544310051c6d5090ca045d75ee98..f6e9317cb1eb33c80534ea382432873551cf35b5 100644 (file)
--- a/lib/types/types.c
+++ b/lib/types/types.c
@@ -22,8 +22,59 @@
 
 #include <ctf/ctf-types.h>
 #include <glib.h>
+#include <errno.h>
+
+struct type_class {
+       GQuark qname;
+       void (*read)();
+       size_t (*write)();
+};
 
 struct type {
-       GQuark name;
-       size_t len;     /* type length, in bits */
+       struct type_class *class;
+       size_t alignment;       /* type alignment, in bits */
+       ssize_t len;            /* type length, in bits. -1 for dynamic size. */
 };
+
+/*
+ * Type class hash table contains the registered type classes. Type class
+ * registration is typically performed by a plugin.
+ * TODO: support plugin unload (unregistration of type classes).
+ */
+GHashTable *type_classes;
+
+struct type_class *ctf_lookup_type_class(GQuark qname)
+{
+       return g_hash_table_lookup(type_classes,
+                                  (gconstpointer) (unsigned long) qname)
+}
+
+int ctf_register_type_class(const char *name,
+                           void (*read)(),
+                           void (*write)())
+{
+       struct type_class tc = g_new(struct type_class, 1);
+       GQuark qname = g_quark_from_string(name);
+
+       if (ctf_lookup_type_class(qname))
+               return -EEXIST;
+
+       g_hash_table_insert(type_classes,
+                           (gconstpointer) (unsigned long) qname,
+                           tc);
+       return 0;
+}
+
+int ctf_init_types(void)
+{
+       type_classes = g_hash_table_new_full(g_direct_hash, g_direct_equal,
+                                            NULL, g_free);
+       if (!type_classes)
+               return -ENOMEM;
+       return 0;
+}
+
+int ctf_finalize_types(void)
+{
+       g_hash_table_destroy(type_classes);
+}