C++ QDECREF函数代码示例

static int openfile(char *name, int flags, bool writethrough, bool force_share,
                    QDict *opts)
{
    Error *local_err = NULL;

    if (qemuio_blk) {
        error_report("file open already, try 'help close'");
        QDECREF(opts);
        return 1;
    }

    if (force_share) {
        if (!opts) {
            opts = qdict_new();
        }
        if (qdict_haskey(opts, BDRV_OPT_FORCE_SHARE)
            && !qdict_get_bool(opts, BDRV_OPT_FORCE_SHARE)) {
            error_report("-U conflicts with image options");
            QDECREF(opts);
            return 1;
        }
        qdict_put_bool(opts, BDRV_OPT_FORCE_SHARE, true);
    }
    qemuio_blk = blk_new_open(name, NULL, opts, flags, &local_err);
    if (!qemuio_blk) {
        error_reportf_err(local_err, "can't open%s%s: ",
                          name ? " device " : "", name ?: "");
        return 1;
    }

static void test_usb_storage_hotplug(void)
{
    QDict *response;

    response = qmp("{'execute': 'device_add',"
                   " 'arguments': {"
                   "   'driver': 'usb-storage',"
                   "   'drive': 'drive0',"
                   "   'id': 'usbdev0'"
                   "}}");
    g_assert(response);
    g_assert(!qdict_haskey(response, "error"));
    QDECREF(response);

    response = qmp("{'execute': 'device_del',"
                           " 'arguments': {"
                           "   'id': 'usbdev0'"
                           "}}");
    g_assert(response);
    g_assert(!qdict_haskey(response, "error"));
    QDECREF(response);

    response = qmp("");
    g_assert(response);
    g_assert(qdict_haskey(response, "event"));
    g_assert(!strcmp(qdict_get_str(response, "event"), "DEVICE_DELETED"));
    QDECREF(response);
}

static void qnull_visit_test(void)
{
    QObject *obj;
    Visitor *v;
    QNull *null;

    /*
     * Most tests of interactions between QObject and visitors are in
     * test-qmp-*-visitor; but these tests live here because they
     * depend on layering violations to check qnull_ refcnt.
     */

    g_assert(qnull_.base.refcnt == 1);
    obj = QOBJECT(qnull());
    v = qobject_input_visitor_new(obj);
    qobject_decref(obj);
    visit_type_null(v, NULL, &null, &error_abort);
    g_assert(obj == QOBJECT(&qnull_));
    QDECREF(null);
    visit_free(v);

    null = NULL;
    v = qobject_output_visitor_new(&obj);
    visit_type_null(v, NULL, &null, &error_abort);
    visit_complete(v, &obj);
    g_assert(obj == QOBJECT(&qnull_));
    QDECREF(null);
    qobject_decref(obj);
    visit_free(v);

    g_assert(qnull_.base.refcnt == 1);
}

static void qdict_crumple_test_bad_inputs(void)
{
    QDict *src;
    Error *error = NULL;

    src = qdict_new();
    /* rule.0 can't be both a string and a dict */
    qdict_put(src, "rule.0", qstring_from_str("fred"));
    qdict_put(src, "rule.0.policy", qstring_from_str("allow"));

    g_assert(qdict_crumple(src, &error) == NULL);
    g_assert(error != NULL);
    error_free(error);
    error = NULL;
    QDECREF(src);

    src = qdict_new();
    /* rule can't be both a list and a dict */
    qdict_put(src, "rule.0", qstring_from_str("fred"));
    qdict_put(src, "rule.a", qstring_from_str("allow"));

    g_assert(qdict_crumple(src, &error) == NULL);
    g_assert(error != NULL);
    error_free(error);
    error = NULL;
    QDECREF(src);

    src = qdict_new();
    /* The input should be flat, ie no dicts or lists */
    qdict_put(src, "rule.a", qdict_new());
    qdict_put(src, "rule.b", qstring_from_str("allow"));

    g_assert(qdict_crumple(src, &error) == NULL);
    g_assert(error != NULL);
    error_free(error);
    error = NULL;
    QDECREF(src);

    src = qdict_new();
    /* List indexes must not have gaps */
    qdict_put(src, "rule.0", qstring_from_str("deny"));
    qdict_put(src, "rule.3", qstring_from_str("allow"));

    g_assert(qdict_crumple(src, &error) == NULL);
    g_assert(error != NULL);
    error_free(error);
    error = NULL;
    QDECREF(src);

    src = qdict_new();
    /* List indexes must be in %zu format */
    qdict_put(src, "rule.0", qstring_from_str("deny"));
    qdict_put(src, "rule.+1", qstring_from_str("allow"));

    g_assert(qdict_crumple(src, &error) == NULL);
    g_assert(error != NULL);
    error_free(error);
    error = NULL;
    QDECREF(src);
}

/* test commands that return an error due to invalid parameters */
static void test_dispatch_cmd_failure(void)
{
    QDict *req = qdict_new();
    QDict *args = qdict_new();
    QObject *resp;

    qdict_put_obj(req, "execute", QOBJECT(qstring_from_str("user_def_cmd2")));

    resp = qmp_dispatch(&qmp_commands, QOBJECT(req));
    assert(resp != NULL);
    assert(qdict_haskey(qobject_to_qdict(resp), "error"));

    qobject_decref(resp);
    QDECREF(req);

    /* check that with extra arguments it throws an error */
    req = qdict_new();
    qdict_put(args, "a", qint_from_int(66));
    qdict_put(req, "arguments", args);

    qdict_put_obj(req, "execute", QOBJECT(qstring_from_str("user_def_cmd")));

    resp = qmp_dispatch(&qmp_commands, QOBJECT(req));
    assert(resp != NULL);
    assert(qdict_haskey(qobject_to_qdict(resp), "error"));

    qobject_decref(resp);
    QDECREF(req);
}

static void hotplug(void)
{
    QDict *response;
    QOSState *qs;

    qs = qvirtio_scsi_start(
            "-drive id=drv1,if=none,file=null-co://,format=raw");
    response = qmp("{\"execute\": \"device_add\","
                   " \"arguments\": {"
                   "   \"driver\": \"scsi-hd\","
                   "   \"id\": \"scsi-hd\","
                   "   \"drive\": \"drv1\""
                   "}}");

    g_assert(response);
    g_assert(!qdict_haskey(response, "error"));
    QDECREF(response);

    response = qmp("{\"execute\": \"device_del\","
                   " \"arguments\": {"
                   "   \"id\": \"scsi-hd\""
                   "}}");

    g_assert(response);
    g_assert(!qdict_haskey(response, "error"));
    g_assert(qdict_haskey(response, "event"));
    g_assert(!strcmp(qdict_get_str(response, "event"), "DEVICE_DELETED"));
    QDECREF(response);
    qvirtio_scsi_stop(qs);
}

static int send_response(GAState *s, QObject *payload)
{
    const char *buf;
    QString *payload_qstr, *response_qstr;
    GIOStatus status;

    g_assert(payload && s->channel);

    payload_qstr = qobject_to_json(payload);
    if (!payload_qstr) {
        return -EINVAL;
    }

    if (s->delimit_response) {
        s->delimit_response = false;
        response_qstr = qstring_new();
        qstring_append_chr(response_qstr, QGA_SENTINEL_BYTE);
        qstring_append(response_qstr, qstring_get_str(payload_qstr));
        QDECREF(payload_qstr);
    } else {
        response_qstr = payload_qstr;
    }

    qstring_append_chr(response_qstr, '\n');
    buf = qstring_get_str(response_qstr);
    status = ga_channel_write_all(s->channel, buf, strlen(buf));
    QDECREF(response_qstr);
    if (status != G_IO_STATUS_NORMAL) {
        return -EIO;
    }

    return 0;
}

static void test_drive_add_empty(void)
{
    QDict *response;
    const char *response_return;

    /* Start with an empty drive */
    qtest_start("-drive if=none,id=drive0");

    /* Delete the drive */
    response = qmp("{\"execute\": \"human-monitor-command\","
                   " \"arguments\": {"
                   "   \"command-line\": \"drive_del drive0\""
                   "}}");
    g_assert(response);
    response_return = qdict_get_try_str(response, "return");
    g_assert(response_return);
    g_assert(strcmp(response_return, "") == 0);
    QDECREF(response);

    /* Ensure re-adding the drive works - there should be no duplicate ID error
     * because the old drive must be gone.
     */
    response = qmp("{\"execute\": \"human-monitor-command\","
                   " \"arguments\": {"
                   "   \"command-line\": \"drive_add 0 if=none,id=drive0\""
                   "}}");
    g_assert(response);
    response_return = qdict_get_try_str(response, "return");
    g_assert(response_return);
    g_assert(strcmp(response_return, "OK\r\n") == 0);
    QDECREF(response);

    qtest_end();
}

static void qdict_crumple_test_recursive(void)
{
    QDict *src, *dst, *rule, *vnc, *acl, *listen;
    QList *rules;

    src = qdict_new();
    qdict_put(src, "vnc.listen.addr", qstring_from_str("127.0.0.1"));
    qdict_put(src, "vnc.listen.port", qstring_from_str("5901"));
    qdict_put(src, "vnc.acl.rules.0.match", qstring_from_str("fred"));
    qdict_put(src, "vnc.acl.rules.0.policy", qstring_from_str("allow"));
    qdict_put(src, "vnc.acl.rules.1.match", qstring_from_str("bob"));
    qdict_put(src, "vnc.acl.rules.1.policy", qstring_from_str("deny"));
    qdict_put(src, "vnc.acl.default", qstring_from_str("deny"));
    qdict_put(src, "vnc.acl..name", qstring_from_str("acl0"));
    qdict_put(src, "vnc.acl.rule..name", qstring_from_str("acl0"));

    dst = qobject_to_qdict(qdict_crumple(src, &error_abort));
    g_assert(dst);
    g_assert_cmpint(qdict_size(dst), ==, 1);

    vnc = qdict_get_qdict(dst, "vnc");
    g_assert(vnc);
    g_assert_cmpint(qdict_size(vnc), ==, 3);

    listen = qdict_get_qdict(vnc, "listen");
    g_assert(listen);
    g_assert_cmpint(qdict_size(listen), ==, 2);
    g_assert_cmpstr("127.0.0.1", ==, qdict_get_str(listen, "addr"));
    g_assert_cmpstr("5901", ==, qdict_get_str(listen, "port"));

    acl = qdict_get_qdict(vnc, "acl");
    g_assert(acl);
    g_assert_cmpint(qdict_size(acl), ==, 3);

    rules = qdict_get_qlist(acl, "rules");
    g_assert(rules);
    g_assert_cmpint(qlist_size(rules), ==, 2);

    rule = qobject_to_qdict(qlist_pop(rules));
    g_assert(rule);
    g_assert_cmpint(qdict_size(rule), ==, 2);
    g_assert_cmpstr("fred", ==, qdict_get_str(rule, "match"));
    g_assert_cmpstr("allow", ==, qdict_get_str(rule, "policy"));
    QDECREF(rule);

    rule = qobject_to_qdict(qlist_pop(rules));
    g_assert(rule);
    g_assert_cmpint(qdict_size(rule), ==, 2);
    g_assert_cmpstr("bob", ==, qdict_get_str(rule, "match"));
    g_assert_cmpstr("deny", ==, qdict_get_str(rule, "policy"));
    QDECREF(rule);

    /* With recursive crumpling, we should see all names unescaped */
    g_assert_cmpstr("acl0", ==, qdict_get_str(vnc, "acl.name"));
    g_assert_cmpstr("acl0", ==, qdict_get_str(acl, "rule.name"));

    QDECREF(src);
    QDECREF(dst);
}

static void qdict_crumple_test_empty(void)
{
    QDict *src, *dst;

    src = qdict_new();

    dst = (QDict *)qdict_crumple(src, &error_abort);

    g_assert_cmpint(qdict_size(dst), ==, 0);

    QDECREF(src);
    QDECREF(dst);
}

/* test commands that involve both input parameters and return values */
static void test_dispatch_cmd_io(void)
{
    QDict *req = qdict_new();
    QDict *args = qdict_new();
    QDict *args3 = qdict_new();
    QDict *ud1a = qdict_new();
    QDict *ud1b = qdict_new();
    QDict *ret, *ret_dict, *ret_dict_dict, *ret_dict_dict_userdef;
    QDict *ret_dict_dict2, *ret_dict_dict2_userdef;
    QNum *ret3;
    int64_t val;

    qdict_put_int(ud1a, "integer", 42);
    qdict_put_str(ud1a, "string", "hello");
    qdict_put_int(ud1b, "integer", 422);
    qdict_put_str(ud1b, "string", "hello2");
    qdict_put(args, "ud1a", ud1a);
    qdict_put(args, "ud1b", ud1b);
    qdict_put(req, "arguments", args);
    qdict_put_str(req, "execute", "user_def_cmd2");

    ret = qobject_to_qdict(test_qmp_dispatch(req));

    assert(!strcmp(qdict_get_str(ret, "string0"), "blah1"));
    ret_dict = qdict_get_qdict(ret, "dict1");
    assert(!strcmp(qdict_get_str(ret_dict, "string1"), "blah2"));
    ret_dict_dict = qdict_get_qdict(ret_dict, "dict2");
    ret_dict_dict_userdef = qdict_get_qdict(ret_dict_dict, "userdef");
    assert(qdict_get_int(ret_dict_dict_userdef, "integer") == 42);
    assert(!strcmp(qdict_get_str(ret_dict_dict_userdef, "string"), "hello"));
    assert(!strcmp(qdict_get_str(ret_dict_dict, "string"), "blah3"));
    ret_dict_dict2 = qdict_get_qdict(ret_dict, "dict3");
    ret_dict_dict2_userdef = qdict_get_qdict(ret_dict_dict2, "userdef");
    assert(qdict_get_int(ret_dict_dict2_userdef, "integer") == 422);
    assert(!strcmp(qdict_get_str(ret_dict_dict2_userdef, "string"), "hello2"));
    assert(!strcmp(qdict_get_str(ret_dict_dict2, "string"), "blah4"));
    QDECREF(ret);

    qdict_put_int(args3, "a", 66);
    qdict_put(req, "arguments", args3);
    qdict_put_str(req, "execute", "guest-get-time");

    ret3 = qobject_to_qnum(test_qmp_dispatch(req));
    g_assert(qnum_get_try_int(ret3, &val));
    g_assert_cmpint(val, ==, 66);
    QDECREF(ret3);

    QDECREF(req);
}

/* handle requests/control events coming in over the channel */
static void process_event(JSONMessageParser *parser, QList *tokens)
{
    GAState *s = container_of(parser, GAState, parser);
    QObject *obj;
    QDict *qdict;
    Error *err = NULL;
    int ret;

    g_assert(s && parser);

    g_debug("process_event: called");
    obj = json_parser_parse_err(tokens, NULL, &err);
    if (err || !obj || qobject_type(obj) != QTYPE_QDICT) {
        qobject_decref(obj);
        qdict = qdict_new();
        if (!err) {
            g_warning("failed to parse event: unknown error");
            error_set(&err, QERR_JSON_PARSING);
        } else {
            g_warning("failed to parse event: %s", error_get_pretty(err));
        }
        qdict_put_obj(qdict, "error", error_get_qobject(err));
        error_free(err);
    } else {
        qdict = qobject_to_qdict(obj);
    }

    g_assert(qdict);

    /* handle host->guest commands */
    if (qdict_haskey(qdict, "execute")) {
        process_command(s, qdict);
    } else {
        if (!qdict_haskey(qdict, "error")) {
            QDECREF(qdict);
            qdict = qdict_new();
            g_warning("unrecognized payload format");
            error_set(&err, QERR_UNSUPPORTED);
            qdict_put_obj(qdict, "error", error_get_qobject(err));
            error_free(err);
        }
        ret = conn_channel_send_payload(s->conn_channel, QOBJECT(qdict));
        if (ret) {
            g_warning("error sending payload: %s", strerror(ret));
        }
    }

    QDECREF(qdict);
}

/* test commands that involve both input parameters and return values */
static void test_dispatch_cmd_io(void)
{
    QDict *req = qdict_new();
    QDict *args = qdict_new();
    QDict *ud1a = qdict_new();
    QDict *ud1b = qdict_new();
    QObject *resp;

    qdict_put_obj(ud1a, "integer", QOBJECT(qint_from_int(42)));
    qdict_put_obj(ud1a, "string", QOBJECT(qstring_from_str("hello")));
    qdict_put_obj(ud1b, "integer", QOBJECT(qint_from_int(422)));
    qdict_put_obj(ud1b, "string", QOBJECT(qstring_from_str("hello2")));
    qdict_put_obj(args, "ud1a", QOBJECT(ud1a));
    qdict_put_obj(args, "ud1b", QOBJECT(ud1b));
    qdict_put_obj(req, "arguments", QOBJECT(args));

    qdict_put_obj(req, "execute", QOBJECT(qstring_from_str("user_def_cmd2")));

    /* TODO: put in full payload and check for errors */
    resp = qmp_dispatch(QOBJECT(req));
    assert(resp != NULL);
    assert(!qdict_haskey(qobject_to_qdict(resp), "error"));
    g_print("\nresp: %s\n", qstring_get_str(qobject_to_json_pretty(resp)));

    qobject_decref(resp);
    QDECREF(req);
}

static void qobject_to_qdict_test(void)
{
    QDict *tests_dict = qdict_new();
    g_assert(qobject_to_qdict(QOBJECT(tests_dict)) == tests_dict);

    QDECREF(tests_dict);
}

/* test generated deallocation on an object whose construction was prematurely
 * terminated due to an error */
static void test_dealloc_partial(void)
{
    static const char text[] = "don't leak me";

    UserDefTwo *ud2 = NULL;
    Error *err = NULL;

    /* create partial object */
    {
        QDict *ud2_dict;
        QmpInputVisitor *qiv;

        ud2_dict = qdict_new();
        qdict_put_obj(ud2_dict, "string0", QOBJECT(qstring_from_str(text)));

        qiv = qmp_input_visitor_new(QOBJECT(ud2_dict));
        visit_type_UserDefTwo(qmp_input_get_visitor(qiv), &ud2, NULL, &err);
        qmp_input_visitor_cleanup(qiv);
        QDECREF(ud2_dict);
    }

    /* verify partial success */
    assert(ud2 != NULL);
    assert(ud2->string0 != NULL);
    assert(strcmp(ud2->string0, text) == 0);
    assert(ud2->dict1 == NULL);

    /* confirm & release construction error */
    assert(err != NULL);
    error_free(err);

    /* tear down partial object */
    qapi_free_UserDefTwo(ud2);
}