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
  19 QEMU_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
  28 static 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
  38 void 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
  46 static 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
  56 bool 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 }