1 /* 2 * Copyright (c) 2009, 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; 26 27 import java.util.Map; 28 29 import org.graalvm.compiler.core.common.type.Stamp; 30 import org.graalvm.compiler.core.common.type.StampFactory; 31 import org.graalvm.compiler.graph.NodeClass; 32 import org.graalvm.compiler.graph.NodeInputList; 33 import org.graalvm.compiler.nodeinfo.NodeInfo; 34 import org.graalvm.compiler.nodes.type.StampTool; 35 import org.graalvm.util.CollectionsUtil; 36 37 /** 38 * Value {@link PhiNode}s merge data flow values at control flow merges. 39 */ 40 @NodeInfo(nameTemplate = "Phi({i#values}, {p#valueDescription})") 41 public class ValuePhiNode extends PhiNode { 42 43 public static final NodeClass<ValuePhiNode> TYPE = NodeClass.create(ValuePhiNode.class); 44 @Input protected NodeInputList<ValueNode> values; 45 ValuePhiNode(Stamp stamp, AbstractMergeNode merge)46 public ValuePhiNode(Stamp stamp, AbstractMergeNode merge) { 47 this(TYPE, stamp, merge); 48 } 49 ValuePhiNode(NodeClass<? extends ValuePhiNode> c, Stamp stamp, AbstractMergeNode merge)50 protected ValuePhiNode(NodeClass<? extends ValuePhiNode> c, Stamp stamp, AbstractMergeNode merge) { 51 super(c, stamp, merge); 52 assert stamp != StampFactory.forVoid(); 53 values = new NodeInputList<>(this); 54 } 55 ValuePhiNode(Stamp stamp, AbstractMergeNode merge, ValueNode[] values)56 public ValuePhiNode(Stamp stamp, AbstractMergeNode merge, ValueNode[] values) { 57 super(TYPE, stamp, merge); 58 assert stamp != StampFactory.forVoid(); 59 this.values = new NodeInputList<>(this, values); 60 } 61 62 @Override values()63 public NodeInputList<ValueNode> values() { 64 return values; 65 } 66 67 @Override inferStamp()68 public boolean inferStamp() { 69 /* 70 * Meet all the values feeding this Phi but don't use the stamp of this Phi since that's 71 * what's being computed. 72 */ 73 Stamp valuesStamp = StampTool.meetOrNull(values(), this); 74 if (valuesStamp == null) { 75 valuesStamp = stamp; 76 } else if (stamp.isCompatible(valuesStamp)) { 77 valuesStamp = stamp.join(valuesStamp); 78 } 79 return updateStamp(valuesStamp); 80 } 81 82 @Override verify()83 public boolean verify() { 84 Stamp s = null; 85 for (ValueNode input : values()) { 86 assert input != null; 87 if (s == null) { 88 s = input.stamp(NodeView.DEFAULT); 89 } else { 90 if (!s.isCompatible(input.stamp(NodeView.DEFAULT))) { 91 fail("Phi Input Stamps are not compatible. Phi:%s inputs:%s", this, 92 CollectionsUtil.mapAndJoin(values(), x -> x.toString() + ":" + x.stamp(NodeView.DEFAULT), ", ")); 93 } 94 } 95 } 96 return super.verify(); 97 } 98 99 @Override valueDescription()100 protected String valueDescription() { 101 return stamp(NodeView.DEFAULT).unrestricted().toString(); 102 } 103 104 @Override getDebugProperties(Map<Object, Object> map)105 public Map<Object, Object> getDebugProperties(Map<Object, Object> map) { 106 Map<Object, Object> properties = super.getDebugProperties(map); 107 properties.put("valueDescription", valueDescription()); 108 return properties; 109 } 110 } 111