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| author | Markus Armbruster <armbru@redhat.com> | 2015-04-29 15:35:05 -0600 |
|---|---|---|
| committer | Luiz Capitulino <lcapitulino@redhat.com> | 2015-05-11 08:59:07 -0400 |
| commit | 481b002cc81ed7fc7b06e32e9d4d495d81739d14 (patch) | |
| tree | 20dbf5ec82cf594cdfeefe5db655d411fb55b78d /include/qapi | |
| parent | a7c31816288a8f20fc387d69d441413e7a8c9ff1 (diff) | |
| download | qemu-481b002cc81ed7fc7b06e32e9d4d495d81739d14.zip qemu-481b002cc81ed7fc7b06e32e9d4d495d81739d14.tar.gz qemu-481b002cc81ed7fc7b06e32e9d4d495d81739d14.tar.bz2 | |
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>
Diffstat (limited to 'include/qapi')
| -rw-r--r-- | include/qapi/qmp/qobject.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/include/qapi/qmp/qobject.h b/include/qapi/qmp/qobject.h index 0991296..84b2d9f 100644 --- a/include/qapi/qmp/qobject.h +++ b/include/qapi/qmp/qobject.h @@ -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 */ |