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 }