LXR qemu/qobject/qobject.c

   1/*
   2 * QObject
   3 *
   4 * Copyright (C) 2015 Red Hat, Inc.
   5 *
   6 * This work is licensed under the terms of the GNU LGPL, version 2.1
   7 * or later.  See the COPYING.LIB file in the top-level directory.
   8 */
   9
  10#include "qemu/osdep.h"
  11#include "qapi/qmp/qbool.h"
  12#include "qapi/qmp/qnull.h"
  13#include "qapi/qmp/qnum.h"
  14#include "qapi/qmp/qdict.h"
  15#include "qapi/qmp/qlist.h"
  16#include "qapi/qmp/qstring.h"
  17#include "qobject-internal.h"
  18
  19QEMU_BUILD_BUG_MSG(
  20    offsetof(QNull, base) != 0 ||
  21    offsetof(QNum, base) != 0 ||
  22    offsetof(QString, base) != 0 ||
  23    offsetof(QDict, base) != 0 ||
  24    offsetof(QList, base) != 0 ||
  25    offsetof(QBool, base) != 0,
  26    "base qobject must be at offset 0");
  27
  28static void (*qdestroy[QTYPE__MAX])(QObject *) = {
  29    [QTYPE_NONE] = NULL,               /* No such object exists */
  30    [QTYPE_QNULL] = NULL,              /* qnull_ is indestructible */
  31    [QTYPE_QNUM] = qnum_destroy_obj,
  32    [QTYPE_QSTRING] = qstring_destroy_obj,
  33    [QTYPE_QDICT] = qdict_destroy_obj,
  34    [QTYPE_QLIST] = qlist_destroy_obj,
  35    [QTYPE_QBOOL] = qbool_destroy_obj,
  36};
  37
  38void qobject_destroy(QObject *obj)
  39{
  40    assert(!obj->base.refcnt);
  41    assert(QTYPE_QNULL < obj->base.type && obj->base.type < QTYPE__MAX);
  42    qdestroy[obj->base.type](obj);
  43}
  44
  45
  46static bool (*qis_equal[QTYPE__MAX])(const QObject *, const QObject *) = {
  47    [QTYPE_NONE] = NULL,               /* No such object exists */
  48    [QTYPE_QNULL] = qnull_is_equal,
  49    [QTYPE_QNUM] = qnum_is_equal,
  50    [QTYPE_QSTRING] = qstring_is_equal,
  51    [QTYPE_QDICT] = qdict_is_equal,
  52    [QTYPE_QLIST] = qlist_is_equal,
  53    [QTYPE_QBOOL] = qbool_is_equal,
  54};
  55
  56bool qobject_is_equal(const QObject *x, const QObject *y)
  57{
  58    /* We cannot test x == y because an object does not need to be
  59     * equal to itself (e.g. NaN floats are not). */
  60
  61    if (!x && !y) {
  62        return true;
  63    }
  64
  65    if (!x || !y || x->base.type != y->base.type) {
  66        return false;
  67    }
  68
  69    assert(QTYPE_NONE < x->base.type && x->base.type < QTYPE__MAX);
  70
  71    return qis_equal[x->base.type](x, y);
  72}
  73