1 /* 2 * Copyright (c) 2016, 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 org.graalvm.compiler.hotspot.replacements; 24 25 import static org.graalvm.compiler.core.common.GraalOptions.ImmutableCode; 26 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_0; 27 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_0; 28 29 import org.graalvm.compiler.core.common.LocationIdentity; 30 import org.graalvm.compiler.core.common.type.AbstractObjectStamp; 31 import org.graalvm.compiler.core.common.type.StampFactory; 32 import org.graalvm.compiler.graph.Node; 33 import org.graalvm.compiler.graph.NodeClass; 34 import org.graalvm.compiler.graph.spi.Canonicalizable; 35 import org.graalvm.compiler.graph.spi.CanonicalizerTool; 36 import org.graalvm.compiler.nodeinfo.NodeInfo; 37 import org.graalvm.compiler.nodes.ConstantNode; 38 import org.graalvm.compiler.nodes.FixedWithNextNode; 39 import org.graalvm.compiler.nodes.ValueNode; 40 import org.graalvm.compiler.nodes.memory.MemoryCheckpoint; 41 import org.graalvm.compiler.nodes.spi.Lowerable; 42 import org.graalvm.compiler.nodes.spi.LoweringTool; 43 44 import jdk.vm.ci.hotspot.HotSpotObjectConstant; 45 import jdk.vm.ci.meta.JavaConstant; 46 47 @NodeInfo(cycles = CYCLES_0, size = SIZE_0) 48 public class IdentityHashCodeNode extends FixedWithNextNode implements Canonicalizable, Lowerable, MemoryCheckpoint.Single { 49 50 public static final NodeClass<IdentityHashCodeNode> TYPE = NodeClass.create(IdentityHashCodeNode.class); 51 52 @Input ValueNode object; 53 54 public IdentityHashCodeNode(ValueNode object) { 55 super(TYPE, StampFactory.forInteger(32)); 56 this.object = object; 57 58 } 59 60 @Override 61 public LocationIdentity getLocationIdentity() { 62 return HotSpotReplacementsUtil.MARK_WORD_LOCATION; 63 } 64 65 @Override 66 public Node canonical(CanonicalizerTool tool) { 67 if (object.isConstant()) { 68 assert object.stamp() instanceof AbstractObjectStamp; 69 JavaConstant c = (JavaConstant) object.asConstant(); 70 if (ImmutableCode.getValue()) { 71 return this; 72 } 73 JavaConstant identityHashCode = null; 74 if (c.isNull()) { 75 identityHashCode = JavaConstant.forInt(0); 76 } else { 77 identityHashCode = JavaConstant.forInt(((HotSpotObjectConstant) c).getIdentityHashCode()); 78 } 79 80 return new ConstantNode(identityHashCode, StampFactory.forConstant(identityHashCode)); 81 } 82 return this; 83 } 84 85 @Override 86 public void lower(LoweringTool tool) { 87 tool.getLowerer().lower(this, tool); 88 } 89 90 @NodeIntrinsic 91 public static native int identityHashCode(Object object); 92 93 }