jdk8-mips64-public/hotspot: src/share/vm/ci/ciNullObject.hpp@ac27a9c85bea

     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

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    23  */

    25 #ifndef SHARE_VM_CI_CINULLOBJECT_HPP

    26 #define SHARE_VM_CI_CINULLOBJECT_HPP

    28 #include "ci/ciClassList.hpp"

    29 #include "ci/ciObject.hpp"

    30 #include "ci/ciUtilities.hpp"

    32 // ciNullObject

    33 //

    34 // This class represents a null reference in the VM.

    35 class ciNullObject : public ciObject {

    36   CI_PACKAGE_ACCESS

    38 private:

    39   ciNullObject() : ciObject() {}

    41   const char* type_string() { return "ciNullObject"; }

    43   void print_impl(outputStream* st);

    45 public:

    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; }

    50   // What kind of ciObject is this?

    51   bool is_null_object() const { return true; }

    52   bool is_classless() const   { return true; }

    54   // Get the distinguished instance of this klass.

    55   static ciNullObject* make();

    56 };

    58 #endif // SHARE_VM_CI_CINULLOBJECT_HPP

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