ir: add bt_ctf_field_get_type_id()

[babeltrace.git] / include / babeltrace / ctf-ir / event-fields.h

diff --git a/include/babeltrace/ctf-ir/event-fields.h b/include/babeltrace/ctf-ir/event-fields.h
index b102d6323a51b6b8056655b61e5ec762560099b4..a1e1351aae2dc648b510503d20133117917fff7e 100644 (file)
--- a/include/babeltrace/ctf-ir/event-fields.h
+++ b/include/babeltrace/ctf-ir/event-fields.h
@@ -154,6 +154,22 @@ extern struct bt_ctf_field *bt_ctf_field_sequence_get_field(
 extern struct bt_ctf_field *bt_ctf_field_variant_get_field(
                struct bt_ctf_field *variant, struct bt_ctf_field *tag);
 
+/*
+ * bt_ctf_field_variant_get_current_field: get the current selected field of a
+ *     variant.
+ *
+ * Return the variant's current selected field. This function, unlike
+ * bt_ctf_field_variant_get_field(), does not create any field; it
+ * returns NULL if there's no current selected field yet.
+ *
+ * @param variant Variant field instance.
+ *
+ * Returns a field instance on success, NULL on error or when there's no
+ * current selected field.
+ */
+extern struct bt_ctf_field *bt_ctf_field_variant_get_current_field(
+               struct bt_ctf_field *variant);
+
 /*
  * bt_ctf_field_enumeration_get_container: get an enumeration field's container.
  *
@@ -336,10 +352,40 @@ extern int bt_ctf_field_string_append_len(
 extern struct bt_ctf_field_type *bt_ctf_field_get_type(
                struct bt_ctf_field *field);
 
+/*
+ * bt_ctf_field_get_type_id: get a field's ctf_type_id.
+ *
+ * This is a helper function which avoids a call to
+ * bt_ctf_field_get_type(), followed by a call to
+ * bt_ctf_field_type_get_type_id(), followed by a call to
+ * bt_ctf_put().
+ *
+ * @param field Field instance.
+ *
+ * Returns the field's ctf_type_id, CTF_TYPE_UNKNOWN on error.
+ */
+extern enum ctf_type_id bt_ctf_field_get_type_id(struct bt_ctf_field *field);
+
+/*
+ * bt_ctf_field_copy: get a field's deep copy.
+ *
+ * Get a field's deep copy. The created field copy shares the source's
+ * associated field types.
+ *
+ * On success, the returned copy has its reference count set to 1.
+ *
+ * @param field Field instance.
+ *
+ * Returns the field copy on success, NULL on error.
+ */
+extern struct bt_ctf_field *bt_ctf_field_copy(struct bt_ctf_field *field);
+
 /*
  * bt_ctf_field_get and bt_ctf_field_put: increment and decrement the
  * field's reference count.
  *
+ * You may also use bt_ctf_get() and bt_ctf_put() with field objects.
+ *
  * These functions ensure that the field won't be destroyed when it
  * is in use. The same number of get and put (plus one extra put to
  * release the initial reference done at creation) have to be done to