1/* 2 * Copyright (c) 2012, 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 */ 23package org.graalvm.compiler.nodes; 24 25import org.graalvm.compiler.graph.Node; 26import org.graalvm.compiler.graph.NodeClass; 27import org.graalvm.compiler.graph.spi.Canonicalizable; 28import org.graalvm.compiler.graph.spi.CanonicalizerTool; 29import org.graalvm.compiler.nodeinfo.NodeInfo; 30import org.graalvm.compiler.nodes.extended.GuardingNode; 31import org.graalvm.compiler.nodes.spi.ValueProxy; 32import org.graalvm.compiler.nodes.spi.Virtualizable; 33import org.graalvm.compiler.nodes.spi.VirtualizerTool; 34import org.graalvm.compiler.nodes.virtual.VirtualObjectNode; 35 36@NodeInfo(nameTemplate = "Proxy({i#value})") 37public final class ValueProxyNode extends ProxyNode implements Canonicalizable, Virtualizable, ValueProxy { 38 39 public static final NodeClass<ValueProxyNode> TYPE = NodeClass.create(ValueProxyNode.class); 40 @Input ValueNode value; 41 private final boolean loopPhiProxy; 42 43 public ValueProxyNode(ValueNode value, LoopExitNode loopExit) { 44 super(TYPE, value.stamp(), loopExit); 45 this.value = value; 46 loopPhiProxy = loopExit.loopBegin().isPhiAtMerge(value); 47 } 48 49 @Override 50 public ValueNode value() { 51 return value; 52 } 53 54 @Override 55 public boolean inferStamp() { 56 return updateStamp(value.stamp()); 57 } 58 59 @Override 60 public Node canonical(CanonicalizerTool tool) { 61 ValueNode curValue = value; 62 if (curValue.isConstant()) { 63 return curValue; 64 } 65 if (loopPhiProxy && !loopExit.loopBegin().isPhiAtMerge(curValue)) { 66 return curValue; 67 } 68 return this; 69 } 70 71 @Override 72 public void virtualize(VirtualizerTool tool) { 73 ValueNode alias = tool.getAlias(value); 74 if (alias instanceof VirtualObjectNode) { 75 tool.replaceWithVirtual((VirtualObjectNode) alias); 76 } 77 } 78 79 @Override 80 public ValueNode getOriginalNode() { 81 return value(); 82 } 83 84 @Override 85 public GuardingNode getGuard() { 86 return this.proxyPoint(); 87 } 88} 89