1/* 2 * Copyright (c) 1999, 2010, 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. 22 * 23 */ 24 25#ifndef SHARE_VM_CI_CINULLOBJECT_HPP 26#define SHARE_VM_CI_CINULLOBJECT_HPP 27 28#include "ci/ciClassList.hpp" 29#include "ci/ciObject.hpp" 30#include "ci/ciUtilities.hpp" 31 32// ciNullObject 33// 34// This class represents a null reference in the VM. 35class ciNullObject : public ciObject { 36 CI_PACKAGE_ACCESS 37 38private: 39 ciNullObject() : ciObject() {} 40 41 const char* type_string() { return "ciNullObject"; } 42 43 void print_impl(outputStream* st); 44 45public: 46 // Is this ciObject a Java Language Object? That is, 47 // is the ciObject an instance or an array 48 bool is_java_object() { return true; } 49 50 // What kind of ciObject is this? 51 bool is_null_object() const { return true; } 52 bool is_classless() const { return true; } 53 54 // Get the distinguished instance of this klass. 55 static ciNullObject* make(); 56}; 57 58#endif // SHARE_VM_CI_CINULLOBJECT_HPP 59