1 /* 2 * Copyright (c) 2012, 2020, 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; 26 27 import org.graalvm.compiler.graph.Node; 28 import org.graalvm.compiler.graph.NodeClass; 29 import org.graalvm.compiler.graph.spi.Canonicalizable; 30 import org.graalvm.compiler.graph.spi.CanonicalizerTool; 31 import org.graalvm.compiler.nodeinfo.NodeInfo; 32 import org.graalvm.compiler.nodes.extended.GuardingNode; 33 import org.graalvm.compiler.nodes.spi.ValueProxy; 34 import org.graalvm.compiler.nodes.spi.Virtualizable; 35 import org.graalvm.compiler.nodes.spi.VirtualizerTool; 36 import org.graalvm.compiler.nodes.virtual.VirtualObjectNode; 37 38 @NodeInfo(nameTemplate = "ValueProxy({i#value})") 39 public final class ValueProxyNode extends ProxyNode implements Canonicalizable, Virtualizable, ValueProxy { 40 41 public static final NodeClass<ValueProxyNode> TYPE = NodeClass.create(ValueProxyNode.class); 42 @Input ValueNode value; 43 private final boolean loopPhiProxy; 44 ValueProxyNode(ValueNode value, LoopExitNode loopExit)45 public ValueProxyNode(ValueNode value, LoopExitNode loopExit) { 46 super(TYPE, value.stamp(NodeView.DEFAULT), loopExit); 47 this.value = value; 48 loopPhiProxy = loopExit.loopBegin().isPhiAtMerge(value); 49 } 50 51 @Override value()52 public ValueNode value() { 53 return value; 54 } 55 56 @Override createPhi(AbstractMergeNode merge)57 public PhiNode createPhi(AbstractMergeNode merge) { 58 return graph().addWithoutUnique(new ValuePhiNode(stamp(NodeView.DEFAULT), merge)); 59 } 60 61 @Override inferStamp()62 public boolean inferStamp() { 63 return updateStamp(value.stamp(NodeView.DEFAULT)); 64 } 65 66 @Override canonical(CanonicalizerTool tool)67 public Node canonical(CanonicalizerTool tool) { 68 Node result = super.canonical(tool); 69 if (result != this) { 70 return result; 71 } 72 73 ValueNode curValue = value; 74 if (curValue.getNodeClass().isLeafNode()) { 75 return curValue; 76 } 77 if (loopPhiProxy && !loopExit.loopBegin().isPhiAtMerge(curValue)) { 78 return curValue; 79 } 80 return this; 81 } 82 83 @Override virtualize(VirtualizerTool tool)84 public void virtualize(VirtualizerTool tool) { 85 ValueNode alias = tool.getAlias(value); 86 if (alias instanceof VirtualObjectNode) { 87 tool.replaceWithVirtual((VirtualObjectNode) alias); 88 } 89 } 90 91 @Override getOriginalNode()92 public ValueNode getOriginalNode() { 93 return value(); 94 } 95 96 @Override getGuard()97 public GuardingNode getGuard() { 98 return this.proxyPoint(); 99 } 100 } 101