1 /* 2 * Copyright (c) 2016, 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.hotspot.nodes.profiling; 24 25 import jdk.vm.ci.meta.ResolvedJavaMethod; 26 27 import org.graalvm.compiler.core.common.type.StampFactory; 28 import org.graalvm.compiler.graph.NodeClass; 29 import org.graalvm.compiler.graph.iterators.NodeIterable; 30 import org.graalvm.compiler.nodeinfo.NodeInfo; 31 import org.graalvm.compiler.nodes.DeoptimizingFixedWithNextNode; 32 import org.graalvm.compiler.nodes.StructuredGraph; 33 import org.graalvm.compiler.nodes.ValueNode; 34 import org.graalvm.compiler.nodes.spi.Lowerable; 35 import org.graalvm.compiler.nodes.spi.LoweringTool; 36 import org.graalvm.compiler.options.Option; 37 import org.graalvm.compiler.options.OptionType; 38 import org.graalvm.compiler.options.OptionValue; 39 40 @NodeInfo 41 public class ProfileNode extends DeoptimizingFixedWithNextNode implements Lowerable { 42 public static class Options { 43 @Option(help = "Control probabilistic profiling on AMD64", type = OptionType.Expert)// 44 public static final OptionValue<Boolean> ProbabilisticProfiling = new OptionValue<>(true); 45 } 46 47 public static final NodeClass<ProfileNode> TYPE = NodeClass.create(ProfileNode.class); 48 49 protected ResolvedJavaMethod method; 50 51 // Only used if ProbabilisticProfiling == true and may be ignored by lowerer. 52 @OptionalInput protected ValueNode random; 53 54 // logarithm base 2 of the profile probability 55 protected int probabilityLog; 56 57 protected ProfileNode(NodeClass<? extends DeoptimizingFixedWithNextNode> c, ResolvedJavaMethod method, int probabilityLog) { 58 super(c, StampFactory.forVoid()); 59 this.method = method; 60 this.probabilityLog = probabilityLog; 61 } 62 63 public ProfileNode(ResolvedJavaMethod method, int probabilityLog) { 64 super(TYPE, StampFactory.forVoid()); 65 this.method = method; 66 this.probabilityLog = probabilityLog; 67 } 68 69 @Override 70 public boolean canDeoptimize() { 71 return true; 72 } 73 74 @Override 75 public void lower(LoweringTool tool) { 76 tool.getLowerer().lower(this, tool); 77 } 78 79 public ResolvedJavaMethod getProfiledMethod() { 80 return method; 81 } 82 83 public ValueNode getRandom() { 84 return random; 85 } 86 87 public void setRandom(ValueNode r) { 88 updateUsages(random, r); 89 this.random = r; 90 } 91 92 /** 93 * Get the logarithm base 2 of the profile probability. 94 */ 95 public int getProbabilityLog() { 96 return probabilityLog; 97 } 98 99 /** 100 * Gathers all the {@link ProfileNode}s that are inputs to the 101 * {@linkplain StructuredGraph#getNodes() live nodes} in a given graph. 102 */ 103 public static NodeIterable<ProfileNode> getProfileNodes(StructuredGraph graph) { 104 return graph.getNodes().filter(ProfileNode.class); 105 } 106 }