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comparison src/share/vm/ci/ciNullObject.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 1999-2000 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // ciNullObject
26 //
27 // This class represents a null reference in the VM.
28 class ciNullObject : public ciObject {
29 CI_PACKAGE_ACCESS
30
31 private:
32 ciNullObject() : ciObject() {}
33
34 const char* type_string() { return "ciNullObject"; }
35
36 void print_impl(outputStream* st);
37
38 public:
39 // Is this ciObject a Java Language Object? That is,
40 // is the ciObject an instance or an array
41 bool is_java_object() { return true; }
42
43 // What kind of ciObject is this?
44 bool is_null_object() const { return true; }
45 bool is_classless() const { return true; }
46
47 // Get the distinguished instance of this klass.
48 static ciNullObject* make();
49 };