qapi: Introduce a first class 'any' type

It's first class, because unlike '**', it actually works, i.e. doesn't
require 'gen': false.

'**' will go away next.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
diff --git a/tests/test-qmp-input-visitor.c b/tests/test-qmp-input-visitor.c
index 508c11a..61715b3 100644
--- a/tests/test-qmp-input-visitor.c
+++ b/tests/test-qmp-input-visitor.c
@@ -298,6 +298,49 @@
     qapi_free_UserDefOneList(head);
 }
 
+static void test_visitor_in_any(TestInputVisitorData *data,
+                                const void *unused)
+{
+    QObject *res = NULL;
+    Error *err = NULL;
+    Visitor *v;
+    QInt *qint;
+    QBool *qbool;
+    QString *qstring;
+    QDict *qdict;
+    QObject *qobj;
+
+    v = visitor_input_test_init(data, "-42");
+    visit_type_any(v, &res, NULL, &err);
+    g_assert(!err);
+    qint = qobject_to_qint(res);
+    g_assert(qint);
+    g_assert_cmpint(qint_get_int(qint), ==, -42);
+    qobject_decref(res);
+
+    v = visitor_input_test_init(data, "{ 'integer': -42, 'boolean': true, 'string': 'foo' }");
+    visit_type_any(v, &res, NULL, &err);
+    g_assert(!err);
+    qdict = qobject_to_qdict(res);
+    g_assert(qdict && qdict_size(qdict) == 3);
+    qobj = qdict_get(qdict, "integer");
+    g_assert(qobj);
+    qint = qobject_to_qint(qobj);
+    g_assert(qint);
+    g_assert_cmpint(qint_get_int(qint), ==, -42);
+    qobj = qdict_get(qdict, "boolean");
+    g_assert(qobj);
+    qbool = qobject_to_qbool(qobj);
+    g_assert(qbool);
+    g_assert(qbool_get_bool(qbool) == true);
+    qobj = qdict_get(qdict, "string");
+    g_assert(qobj);
+    qstring = qobject_to_qstring(qobj);
+    g_assert(qstring);
+    g_assert_cmpstr(qstring_get_str(qstring), ==, "foo");
+    qobject_decref(res);
+}
+
 static void test_visitor_in_union_flat(TestInputVisitorData *data,
                                        const void *unused)
 {
@@ -669,6 +712,8 @@
                            &in_visitor_data, test_visitor_in_struct_nested);
     input_visitor_test_add("/visitor/input/list",
                            &in_visitor_data, test_visitor_in_list);
+    input_visitor_test_add("/visitor/input/any",
+                           &in_visitor_data, test_visitor_in_any);
     input_visitor_test_add("/visitor/input/union-flat",
                            &in_visitor_data, test_visitor_in_union_flat);
     input_visitor_test_add("/visitor/input/alternate",