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qapi: Anonymous unions

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The discriminator for anonymous unions is the data type. This allows to
have a union type that allows both of these:

    { 'file': 'my_existing_block_device_id' }
    { 'file': { 'filename': '/tmp/mydisk.qcow2', 'read-only': true } }

Unions like this are specified in the schema with an empty dict as
discriminator. For this example you could take:

    { 'union': 'BlockRef',
      'discriminator': {},
      'data': { 'definition': 'BlockOptions',
                'reference': 'str' } }
    { 'type': 'ExampleObject',
      'data: { 'file': 'BlockRef' } }

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Kevin Wolf
2013-07-08 16:14:21 +02:00
parent ea66c6d881
commit 69dd62dfd6
10 changed files with 160 additions and 0 deletions
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14
qapi/qmp-input-visitor.c
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@@ -208,6 +208,19 @@ static void qmp_input_end_list(Visitor *v, Error **errp)
qmp_input_pop(qiv, errp);
}
static void qmp_input_get_next_type(Visitor *v, int *kind, const int *qobjects,
const char *name, Error **errp)
{
QmpInputVisitor *qiv = to_qiv(v);
QObject *qobj = qmp_input_get_object(qiv, name, false);
if (!qobj) {
error_set(errp, QERR_MISSING_PARAMETER, name ? name : "null");
return;
}
*kind = qobjects[qobject_type(qobj)];
}
static void qmp_input_type_int(Visitor *v, int64_t *obj, const char *name,
Error **errp)
{
@@ -317,6 +330,7 @@ QmpInputVisitor *qmp_input_visitor_new(QObject *obj)
v->visitor.type_str = qmp_input_type_str;
v->visitor.type_number = qmp_input_type_number;
v->visitor.start_optional = qmp_input_start_optional;
v->visitor.get_next_type = qmp_input_get_next_type;
qmp_input_push(v, obj, NULL);
qobject_incref(obj);