1 /* 2 * Copyright (c) 2011, 2018, 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 24 25 package org.graalvm.compiler.nodes.extended; 26 27 import static org.graalvm.compiler.core.common.GraalOptions.GeneratePIC; 28 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2; 29 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1; 30 31 import org.graalvm.compiler.core.common.type.ObjectStamp; 32 import org.graalvm.compiler.core.common.type.Stamp; 33 import org.graalvm.compiler.core.common.type.TypeReference; 34 import org.graalvm.compiler.graph.NodeClass; 35 import org.graalvm.compiler.graph.spi.Canonicalizable; 36 import org.graalvm.compiler.graph.spi.CanonicalizerTool; 37 import org.graalvm.compiler.nodeinfo.NodeInfo; 38 import org.graalvm.compiler.nodes.ConstantNode; 39 import org.graalvm.compiler.nodes.NodeView; 40 import org.graalvm.compiler.nodes.ValueNode; 41 import org.graalvm.compiler.nodes.calc.FloatingNode; 42 import org.graalvm.compiler.nodes.spi.Lowerable; 43 import org.graalvm.compiler.nodes.spi.LoweringTool; 44 import org.graalvm.compiler.nodes.spi.StampProvider; 45 import org.graalvm.compiler.nodes.spi.Virtualizable; 46 import org.graalvm.compiler.nodes.spi.VirtualizerTool; 47 import org.graalvm.compiler.nodes.type.StampTool; 48 49 import jdk.vm.ci.meta.ConstantReflectionProvider; 50 import jdk.vm.ci.meta.MetaAccessProvider; 51 52 /** 53 * Loads an object's hub. The object is not null-checked by this operation. 54 */ 55 @NodeInfo(cycles = CYCLES_2, size = SIZE_1) 56 public final class LoadHubNode extends FloatingNode implements Lowerable, Canonicalizable, Virtualizable { 57 58 public static final NodeClass<LoadHubNode> TYPE = NodeClass.create(LoadHubNode.class); 59 @Input ValueNode value; 60 61 public ValueNode getValue() { 62 return value; 63 } 64 65 private static Stamp hubStamp(StampProvider stampProvider, ValueNode value) { 66 assert value.stamp(NodeView.DEFAULT) instanceof ObjectStamp; 67 return stampProvider.createHubStamp(((ObjectStamp) value.stamp(NodeView.DEFAULT))); 68 } 69 70 public static ValueNode create(ValueNode value, StampProvider stampProvider, MetaAccessProvider metaAccess, ConstantReflectionProvider constantReflection) { 71 Stamp stamp = hubStamp(stampProvider, value); 72 ValueNode synonym = findSynonym(value, stamp, metaAccess, constantReflection); 73 if (synonym != null) { 74 return synonym; 75 } 76 return new LoadHubNode(stamp, value); 77 } 78 79 public LoadHubNode(@InjectedNodeParameter StampProvider stampProvider, ValueNode value) { 80 this(hubStamp(stampProvider, value), value); 81 } 82 83 public LoadHubNode(Stamp stamp, ValueNode value) { 84 super(TYPE, stamp); 85 this.value = value; 86 } 87 88 @Override 89 public void lower(LoweringTool tool) { 90 tool.getLowerer().lower(this, tool); 91 } 92 93 @Override 94 public ValueNode canonical(CanonicalizerTool tool) { 95 if (!GeneratePIC.getValue(tool.getOptions())) { 96 NodeView view = NodeView.from(tool); 97 MetaAccessProvider metaAccess = tool.getMetaAccess(); 98 ValueNode curValue = getValue(); 99 ValueNode newNode = findSynonym(curValue, stamp(view), metaAccess, tool.getConstantReflection()); 100 if (newNode != null) { 101 return newNode; 102 } 103 } 104 return this; 105 } 106 107 public static ValueNode findSynonym(ValueNode curValue, Stamp stamp, MetaAccessProvider metaAccess, ConstantReflectionProvider constantReflection) { 108 if (!GeneratePIC.getValue(curValue.getOptions())) { 109 TypeReference type = StampTool.typeReferenceOrNull(curValue); 110 if (type != null && type.isExact()) { 111 return ConstantNode.forConstant(stamp, constantReflection.asObjectHub(type.getType()), metaAccess); 112 } 113 } 114 return null; 115 } 116 117 @Override 118 public void virtualize(VirtualizerTool tool) { 119 if (!GeneratePIC.getValue(tool.getOptions())) { 120 ValueNode alias = tool.getAlias(getValue()); 121 TypeReference type = StampTool.typeReferenceOrNull(alias); 122 if (type != null && type.isExact()) { 123 tool.replaceWithValue(ConstantNode.forConstant(stamp(NodeView.DEFAULT), tool.getConstantReflection().asObjectHub(type.getType()), tool.getMetaAccess(), graph())); 124 } 125 } 126 } 127 }