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 }