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1 /*
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2 * Copyright 1999-2000 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // ciNullObject
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26 //
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27 // This class represents a null reference in the VM.
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28 class ciNullObject : public ciObject {
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29 CI_PACKAGE_ACCESS
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30
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31 private:
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32 ciNullObject() : ciObject() {}
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33
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34 const char* type_string() { return "ciNullObject"; }
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35
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36 void print_impl(outputStream* st);
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37
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38 public:
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39 // Is this ciObject a Java Language Object? That is,
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40 // is the ciObject an instance or an array
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41 bool is_java_object() { return true; }
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42
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43 // What kind of ciObject is this?
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44 bool is_null_object() const { return true; }
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45 bool is_classless() const { return true; }
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46
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47 // Get the distinguished instance of this klass.
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48 static ciNullObject* make();
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49 };
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