1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/ci/ciNullObject.hpp Sat Dec 01 00:00:00 2007 +0000
1.3 @@ -0,0 +1,49 @@
1.4 +/*
1.5 + * Copyright 1999-2000 Sun Microsystems, Inc. All Rights Reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
1.23 + * CA 95054 USA or visit www.sun.com if you need additional information or
1.24 + * have any questions.
1.25 + *
1.26 + */
1.27 +
1.28 +// ciNullObject
1.29 +//
1.30 +// This class represents a null reference in the VM.
1.31 +class ciNullObject : public ciObject {
1.32 + CI_PACKAGE_ACCESS
1.33 +
1.34 +private:
1.35 + ciNullObject() : ciObject() {}
1.36 +
1.37 + const char* type_string() { return "ciNullObject"; }
1.38 +
1.39 + void print_impl(outputStream* st);
1.40 +
1.41 +public:
1.42 + // Is this ciObject a Java Language Object? That is,
1.43 + // is the ciObject an instance or an array
1.44 + bool is_java_object() { return true; }
1.45 +
1.46 + // What kind of ciObject is this?
1.47 + bool is_null_object() const { return true; }
1.48 + bool is_classless() const { return true; }
1.49 +
1.50 + // Get the distinguished instance of this klass.
1.51 + static ciNullObject* make();
1.52 +};
