From 7ee9edfdb117da47c86c9764d90f0be11a648666 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= Date: Thu, 19 Apr 2018 17:01:41 +0200 Subject: qobject: Ensure base is at offset 0 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit All QObject types have the base QObject as their first field. This allows the simplification of qobject_to(). Signed-off-by: Marc-André Lureau Reviewed-by: Eric Blake Message-Id: <20180419150145.24795-2-marcandre.lureau@redhat.com> Reviewed-by: Markus Armbruster [Commit message paragraph on type casts dropped, to avoid giving the impression type casting would be okay] Signed-off-by: Markus Armbruster --- qobject/qobject.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'qobject') diff --git a/qobject/qobject.c b/qobject/qobject.c index 23600aa..87649c5 100644 --- a/qobject/qobject.c +++ b/qobject/qobject.c @@ -16,6 +16,15 @@ #include "qapi/qmp/qlist.h" #include "qapi/qmp/qstring.h" +QEMU_BUILD_BUG_MSG( + offsetof(QNull, base) != 0 || + offsetof(QNum, base) != 0 || + offsetof(QString, base) != 0 || + offsetof(QDict, base) != 0 || + offsetof(QList, base) != 0 || + offsetof(QBool, base) != 0, + "base qobject must be at offset 0"); + static void (*qdestroy[QTYPE__MAX])(QObject *) = { [QTYPE_NONE] = NULL, /* No such object exists */ [QTYPE_QNULL] = NULL, /* qnull_ is indestructible */ -- cgit v1.1