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qobject: Add a special null QObject

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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>
This commit is contained in:
Markus Armbruster 2015-04-29 15:35:05 -06:00 • committed by Luiz Capitulino
parent a7c3181628
commit 481b002cc8
4 changed files with 43 additions and 2 deletions
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11
include/qapi/qmp/qobject.h
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@ -3,7 +3,7 @@
*
* Based on ideas by Avi Kivity <avi@redhat.com>
*
* Copyright (C) 2009 Red Hat Inc.
* Copyright (C) 2009, 2015 Red Hat Inc.
*
* Authors:
* Luiz Capitulino <lcapitulino@redhat.com>
@ -37,6 +37,7 @@
typedef enum {
QTYPE_NONE, /* sentinel value, no QObject has this type code */
QTYPE_QNULL,
QTYPE_QINT,
QTYPE_QSTRING,
QTYPE_QDICT,
@ -110,4 +111,12 @@ static inline qtype_code qobject_type(const QObject *obj)
return obj->type->code;
}
extern QObject qnull_;
static inline QObject *qnull(void)
{
qobject_incref(&qnull_);
return &qnull_;
}
#endif /* QOBJECT_H */