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 24 25 package org.graalvm.compiler.nodes.extended; 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.graph.NodeClass; 33 import org.graalvm.compiler.graph.spi.Canonicalizable; 34 import org.graalvm.compiler.graph.spi.CanonicalizerTool; 35 import org.graalvm.compiler.nodeinfo.NodeInfo; 36 import org.graalvm.compiler.nodes.ConstantNode; 37 import org.graalvm.compiler.nodes.NodeView; 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.Virtualizable; 43 import org.graalvm.compiler.nodes.spi.VirtualizerTool; 44 import org.graalvm.compiler.nodes.virtual.VirtualObjectNode; 45 46 import jdk.vm.ci.meta.Constant; 47 import jdk.vm.ci.meta.ConstantReflectionProvider; 48 import jdk.vm.ci.meta.MetaAccessProvider; 49 50 /** 51 * Loads an object's class (i.e., this node can be created for {@code object.getClass()}). 52 */ 53 @NodeInfo(cycles = CYCLES_2, size = SIZE_1) 54 public final class GetClassNode extends FloatingNode implements Lowerable, Canonicalizable, Virtualizable { 55 56 public static final NodeClass<GetClassNode> TYPE = NodeClass.create(GetClassNode.class); 57 @Input ValueNode object; 58 59 public ValueNode getObject() { 60 return object; 61 } 62 63 public GetClassNode(Stamp stamp, ValueNode object) { 64 super(TYPE, stamp); 65 this.object = object; 66 assert ((ObjectStamp) object.stamp(NodeView.DEFAULT)).nonNull(); 67 } 68 69 @Override 70 public void lower(LoweringTool tool) { 71 tool.getLowerer().lower(this, tool); 72 } 73 74 public static ValueNode tryFold(MetaAccessProvider metaAccess, ConstantReflectionProvider constantReflection, NodeView view, ValueNode object) { 75 if (metaAccess != null && object != null && object.stamp(view) instanceof ObjectStamp) { 76 ObjectStamp objectStamp = (ObjectStamp) object.stamp(view); 77 if (objectStamp.isExactType()) { 78 return ConstantNode.forConstant(constantReflection.asJavaClass(objectStamp.type()), metaAccess); 79 } 80 } 81 return null; 82 } 83 84 @Override 85 public ValueNode canonical(CanonicalizerTool tool) { 86 NodeView view = NodeView.from(tool); 87 ValueNode folded = tryFold(tool.getMetaAccess(), tool.getConstantReflection(), view, getObject()); 88 return folded == null ? this : folded; 89 } 90 91 @Override 92 public void virtualize(VirtualizerTool tool) { 93 ValueNode alias = tool.getAlias(getObject()); 94 if (alias instanceof VirtualObjectNode) { 95 VirtualObjectNode virtual = (VirtualObjectNode) alias; 96 Constant javaClass = tool.getConstantReflectionProvider().asJavaClass(virtual.type()); 97 tool.replaceWithValue(ConstantNode.forConstant(stamp(NodeView.DEFAULT), javaClass, tool.getMetaAccessProvider(), graph())); 98 } 99 } 100 }