1 /* 2 * Copyright (c) 2011, 2015, 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.nodes.extended; 24 25 import static org.graalvm.compiler.core.common.GraalOptions.GeneratePIC; 26 27 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2; 28 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1; 29 30 import org.graalvm.compiler.core.common.type.ObjectStamp; 31 import org.graalvm.compiler.core.common.type.Stamp; 32 import org.graalvm.compiler.core.common.type.TypeReference; 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.ValueNode; 39 import org.graalvm.compiler.nodes.calc.FloatingNode; 40 import org.graalvm.compiler.nodes.spi.Lowerable; 41 import org.graalvm.compiler.nodes.spi.LoweringTool; 42 import org.graalvm.compiler.nodes.spi.StampProvider; 43 import org.graalvm.compiler.nodes.spi.Virtualizable; 44 import org.graalvm.compiler.nodes.spi.VirtualizerTool; 45 import org.graalvm.compiler.nodes.type.StampTool; 46 47 import jdk.vm.ci.meta.ConstantReflectionProvider; 48 import jdk.vm.ci.meta.MetaAccessProvider; 49 50 /** 51 * Loads an object's hub. The object is not null-checked by this operation. 52 */ 53 @NodeInfo(cycles = CYCLES_2, size = SIZE_1) 54 public final class LoadHubNode extends FloatingNode implements Lowerable, Canonicalizable, Virtualizable { 55 56 public static final NodeClass<LoadHubNode> TYPE = NodeClass.create(LoadHubNode.class); 57 @Input ValueNode value; 58 59 public ValueNode getValue() { 60 return value; 61 } 62 63 private static Stamp hubStamp(StampProvider stampProvider, ValueNode value) { 64 assert value.stamp() instanceof ObjectStamp; 65 return stampProvider.createHubStamp(((ObjectStamp) value.stamp())); 66 } 67 68 public static ValueNode create(ValueNode value, StampProvider stampProvider, MetaAccessProvider metaAccess, ConstantReflectionProvider constantReflection) { 69 Stamp stamp = hubStamp(stampProvider, value); 70 ValueNode synonym = findSynonym(value, stamp, metaAccess, constantReflection); 71 if (synonym != null) { 72 return synonym; 73 } 74 return new LoadHubNode(stamp, value); 75 } 76 77 public LoadHubNode(@InjectedNodeParameter StampProvider stampProvider, ValueNode value) { 78 this(hubStamp(stampProvider, value), value); 79 } 80 81 public LoadHubNode(Stamp stamp, ValueNode value) { 82 super(TYPE, stamp); 83 this.value = value; 84 } 85 86 @Override 87 public void lower(LoweringTool tool) { 88 tool.getLowerer().lower(this, tool); 89 } 90 91 @Override 92 public ValueNode canonical(CanonicalizerTool tool) { 93 if (!GeneratePIC.getValue()) { 94 MetaAccessProvider metaAccess = tool.getMetaAccess(); 95 ValueNode curValue = getValue(); 96 ValueNode newNode = findSynonym(curValue, stamp(), metaAccess, tool.getConstantReflection()); 97 if (newNode != null) { 98 return newNode; 99 } 100 } 101 return this; 102 } 103 104 public static ValueNode findSynonym(ValueNode curValue, Stamp stamp, MetaAccessProvider metaAccess, ConstantReflectionProvider constantReflection) { 105 if (!GeneratePIC.getValue()) { 106 TypeReference type = StampTool.typeReferenceOrNull(curValue); 107 if (type != null && type.isExact()) { 108 return ConstantNode.forConstant(stamp, constantReflection.asObjectHub(type.getType()), metaAccess); 109 } 110 } 111 return null; 112 } 113 114 @Override 115 public void virtualize(VirtualizerTool tool) { 116 if (!GeneratePIC.getValue()) { 117 ValueNode alias = tool.getAlias(getValue()); 118 TypeReference type = StampTool.typeReferenceOrNull(alias); 119 if (type != null && type.isExact()) { 120 tool.replaceWithValue(ConstantNode.forConstant(stamp(), tool.getConstantReflectionProvider().asObjectHub(type.getType()), tool.getMetaAccessProvider(), graph())); 121 } 122 } 123 } 124 }