1 /*

     2  * Copyright (c) 2018, 2019, 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 package jdk.vm.ci.hotspot;

    24 

    25 import jdk.vm.ci.meta.JavaConstant;

    26 

    27 final class DirectHotSpotObjectConstantImpl extends HotSpotObjectConstantImpl {

    28 

    29     static JavaConstant forObject(Object object, boolean compressed) {

    30         if (object == null) {

    31             return compressed ? HotSpotCompressedNullConstant.COMPRESSED_NULL : JavaConstant.NULL_POINTER;

    32         } else {

    33             return new DirectHotSpotObjectConstantImpl(object, compressed);

    34         }

    35     }

    36 

    37     static HotSpotObjectConstantImpl forNonNullObject(Object object, boolean compressed) {

    38         if (object == null) {

    39             throw new NullPointerException();

    40         }

    41         return new DirectHotSpotObjectConstantImpl(object, compressed);

    42     }

    43 

    44     private DirectHotSpotObjectConstantImpl(Object object, boolean compressed) {

    45         super(compressed);

    46         assert object != null;

    47         this.object = object;

    48     }

    49 

    50     final Object object;

    51 

    52     @Override

    53     public JavaConstant compress() {

    54         assert !compressed;

    55         return new DirectHotSpotObjectConstantImpl(object, true);

    56     }

    57 

    58     @Override

    59     public JavaConstant uncompress() {

    60         assert compressed;

    61         return new DirectHotSpotObjectConstantImpl(object, false);

    62     }

    63 

    64     @Override

    65     public int getIdentityHashCode() {

    66         return System.identityHashCode(object);

    67     }

    68 }