mirror of
https://github.com/yuzu-emu/unicorn
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f4b3c5d0bd
By moving the base fields to a QObjectBase_, QObject can be a type which also has a 'base' field. This allows writing a generic QOBJECT() macro that will work with any QObject type, including QObject itself. The container_of() macro ensures that the object to cast has a QObjectBase_ base field, giving some type safety guarantees. QObject must have no members but QObjectBase_ base, or else QOBJECT() breaks. QObjectBase_ is not a typedef and uses a trailing underscore to make it obvious it is not for normal use and to avoid potential abuse. Backports commit 3d3eacaeccaab718ea0e2ddaa578bfae9e311c59 from qemu
70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/*
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* QObject
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*
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* Copyright (C) 2015 Red Hat, Inc.
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*
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* This work is licensed under the terms of the GNU LGPL, version 2.1
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* or later. See the COPYING.LIB file in the top-level directory.
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*/
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#include "qemu-common.h"
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#include "qapi/qmp/qbool.h"
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#include "qapi/qmp/qnull.h"
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#include "qapi/qmp/qnum.h"
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#include "qapi/qmp/qdict.h"
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#include "qapi/qmp/qlist.h"
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#include "qapi/qmp/qstring.h"
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QEMU_BUILD_BUG_MSG(
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offsetof(QNull, base) != 0 ||
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offsetof(QNum, base) != 0 ||
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offsetof(QString, base) != 0 ||
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offsetof(QDict, base) != 0 ||
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offsetof(QList, base) != 0 ||
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offsetof(QBool, base) != 0,
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"base qobject must be at offset 0");
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static void (*qdestroy[QTYPE__MAX])(QObject *) = {
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NULL, /* No such object exists */
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NULL, /* qnull_ is indestructible */
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qnum_destroy_obj,
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qstring_destroy_obj,
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qdict_destroy_obj,
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qlist_destroy_obj,
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qbool_destroy_obj,
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};
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void qobject_destroy(QObject *obj)
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{
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assert(!obj->base.refcnt);
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assert(QTYPE_QNULL < obj->base.type && obj->base.type < QTYPE__MAX);
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qdestroy[obj->base.type](obj);
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}
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static bool (*qis_equal[QTYPE__MAX])(const QObject *, const QObject *) = {
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NULL, /* No such object exists */
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qnull_is_equal,
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qnum_is_equal,
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qstring_is_equal,
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qdict_is_equal,
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qlist_is_equal,
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qbool_is_equal,
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};
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bool qobject_is_equal(const QObject *x, const QObject *y)
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{
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/* We cannot test x == y because an object does not need to be
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* equal to itself (e.g. NaN floats are not). */
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if (!x && !y) {
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return true;
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}
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if (!x || !y || x->base.type != y->base.type) {
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return false;
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}
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assert(QTYPE_NONE < x->base.type && x->base.type < QTYPE__MAX);
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return qis_equal[x->base.type](x, y);
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}
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