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