xemu/qobject/qnull.c
Markus Armbruster 481b002cc8 qobject: Add a special null QObject
I'm going to fix the JSON parser to recognize null.  The obvious
representation of JSON null as (QObject *)NULL doesn't work, because
the parser already uses it as an error value.  Perhaps we should
change it to free NULL for null, but that's more than I can do right
now.  Create a special null QObject instead.

The existing QDict, QList, and QString all represent something that
is a pointer in C and could therefore be associated with NULL.  But
right now, all three of these sub-types are always non-null once
created, so the new null sentinel object is intentionally unrelated
to them.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2015-05-11 08:59:07 -04:00

30 lines
534 B
C

/*
* QNull
*
* Copyright (C) 2015 Red Hat, Inc.
*
* Authors:
* Markus Armbruster <armbru@redhat.com>
*
* This work is licensed under the terms of the GNU LGPL, version 2.1
* or later. See the COPYING.LIB file in the top-level directory.
*/
#include "qemu-common.h"
#include "qapi/qmp/qobject.h"
static void qnull_destroy_obj(QObject *obj)
{
assert(0);
}
static const QType qnull_type = {
.code = QTYPE_QNULL,
.destroy = qnull_destroy_obj,
};
QObject qnull_ = {
.type = &qnull_type,
.refcnt = 1,
};