1 /* 2 * Copyright (c) 2014, 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.hotspot.replacements; 24 25 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_1; 26 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1; 27 28 import org.graalvm.compiler.core.common.GraalOptions; 29 import org.graalvm.compiler.core.common.type.StampFactory; 30 import org.graalvm.compiler.core.common.type.TypeReference; 31 import org.graalvm.compiler.graph.Node; 32 import org.graalvm.compiler.graph.NodeClass; 33 import org.graalvm.compiler.graph.spi.Canonicalizable; 34 import org.graalvm.compiler.graph.spi.CanonicalizerTool; 35 import org.graalvm.compiler.hotspot.word.KlassPointer; 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.ConvertNode; 40 import org.graalvm.compiler.nodes.calc.FloatingNode; 41 import org.graalvm.compiler.nodes.spi.Lowerable; 42 import org.graalvm.compiler.nodes.spi.LoweringTool; 43 44 import jdk.vm.ci.meta.Constant; 45 import jdk.vm.ci.meta.ConstantReflectionProvider; 46 import jdk.vm.ci.meta.JavaConstant; 47 import jdk.vm.ci.meta.MetaAccessProvider; 48 import jdk.vm.ci.meta.ResolvedJavaType; 49 50 /** 51 * Read {@code Klass::_java_mirror} and incorporate non-null type information into stamp. This is 52 * also used by {@link ClassGetHubNode} to eliminate chains of {@code klass._java_mirror._klass}. 53 */ 54 @NodeInfo(cycles = CYCLES_1, size = SIZE_1) 55 public final class HubGetClassNode extends FloatingNode implements Lowerable, Canonicalizable, ConvertNode { 56 public static final NodeClass<HubGetClassNode> TYPE = NodeClass.create(HubGetClassNode.class); 57 @Input protected ValueNode hub; 58 59 public HubGetClassNode(@InjectedNodeParameter MetaAccessProvider metaAccess, ValueNode hub) { 60 super(TYPE, StampFactory.objectNonNull(TypeReference.createWithoutAssumptions(metaAccess.lookupJavaType(Class.class)))); 61 this.hub = hub; 62 } 63 64 public ValueNode getHub() { 65 return hub; 66 } 67 68 @Override 69 public Node canonical(CanonicalizerTool tool) { 70 if (tool.allUsagesAvailable() && hasNoUsages()) { 71 return null; 72 } else { 73 MetaAccessProvider metaAccess = tool.getMetaAccess(); 74 if (metaAccess != null && hub.isConstant() && !GraalOptions.ImmutableCode.getValue(tool.getOptions())) { 75 ResolvedJavaType exactType = tool.getConstantReflection().asJavaType(hub.asConstant()); 76 if (exactType != null) { 77 return ConstantNode.forConstant(tool.getConstantReflection().asJavaClass(exactType), metaAccess); 78 } 79 } 80 return this; 81 } 82 } 83 84 @Override 85 public void lower(LoweringTool tool) { 86 tool.getLowerer().lower(this, tool); 87 } 88 89 @NodeIntrinsic 90 public static native Class<?> readClass(KlassPointer hub); 91 92 @Override 93 public ValueNode getValue() { 94 return hub; 95 } 96 97 @Override 98 public Constant convert(Constant c, ConstantReflectionProvider constantReflection) { 99 if (JavaConstant.NULL_POINTER.equals(c)) { 100 return c; 101 } 102 return constantReflection.asJavaClass(constantReflection.asJavaType(c)); 103 } 104 105 @Override 106 public Constant reverse(Constant c, ConstantReflectionProvider constantReflection) { 107 if (JavaConstant.NULL_POINTER.equals(c)) { 108 return c; 109 } 110 ResolvedJavaType type = constantReflection.asJavaType(c); 111 if (type.isPrimitive()) { 112 return JavaConstant.NULL_POINTER; 113 } else { 114 return constantReflection.asObjectHub(type); 115 } 116 } 117 118 /** 119 * Any concrete Klass* has a corresponding {@link java.lang.Class}. 120 */ 121 @Override 122 public boolean isLossless() { 123 return true; 124 } 125 126 @Override 127 public boolean mayNullCheckSkipConversion() { 128 return true; 129 } 130 }