1/*
2 * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
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23 */
24
25#ifndef SHARE_CI_CINULLOBJECT_HPP
26#define SHARE_CI_CINULLOBJECT_HPP
27
28#include "ci/ciClassList.hpp"
29#include "ci/ciObject.hpp"
30
31// ciNullObject
32//
33// This class represents a null reference in the VM.
34class ciNullObject : public ciObject {
35 CI_PACKAGE_ACCESS
36
37private:
38 ciNullObject() : ciObject() {}
39
40 const char* type_string() { return "ciNullObject"; }
41
42 void print_impl(outputStream* st);
43
44public:
45
46 // What kind of ciObject is this?
47 bool is_null_object() const { return true; }
48 bool is_classless() const { return true; }
49
50 // Get the distinguished instance of this klass.
51 static ciNullObject* make();
52};
53
54#endif // SHARE_CI_CINULLOBJECT_HPP
55